From f0f68f42d1047f2977358f2eb65aa292fb2b1140 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Sat, 12 Jun 2021 13:05:33 -0400
Subject: [PATCH 01/73] devel release

---
 Changes      | 7 +++++++
 configure.ac | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Changes b/Changes
index d0d49ab8d..bbefbafeb 100644
--- a/Changes
+++ b/Changes
@@ -8,6 +8,13 @@ The changes in each Verilator version are described below.  The
 contributors that suggested a given feature are shown in []. Thanks!
 
 
+Verilator 4.205 devel
+==========================
+
+**Minor:**
+
+
+
 Verilator 4.204 2021-06-12
 ==========================
 
diff --git a/configure.ac b/configure.ac
index ee5043af4..9973fe8fe 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,7 +7,7 @@
 
 #AC_INIT([Verilator],[#.### YYYY-MM-DD])
 #AC_INIT([Verilator],[#.### devel])
-AC_INIT([Verilator],[4.204 2021-06-12],
+AC_INIT([Verilator],[4.205 devel],
         [https://verilator.org],
         [verilator],[https://verilator.org])
 # When releasing, also update header of Changes file

From b1c7de4ad5a20ea212ac40e3b40bd8a8568d4583 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sat, 12 Jun 2021 23:03:32 +0100
Subject: [PATCH 02/73] Minor compiler compatibility fixes

- Initialize variable to avoid 'may be uninitialized' warning
- More reliable segfault (the previous version was compiled into an
undefined instruction by clang sometimes, thew new one is always a store
to zero).
---
 src/V3LinkInc.cpp | 2 +-
 src/V3Options.cpp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/V3LinkInc.cpp b/src/V3LinkInc.cpp
index 44f3cde8f..379b5f3e9 100644
--- a/src/V3LinkInc.cpp
+++ b/src/V3LinkInc.cpp
@@ -176,7 +176,7 @@ private:
     void prepost_stmt_visit(AstNodeTriop* nodep) {
         iterateChildren(nodep);
 
-        AstNodeVarRef* varrefp;
+        AstNodeVarRef* varrefp = nullptr;
         if (m_unsupportedHere || !(varrefp = VN_CAST(nodep->rhsp(), VarRef))) {
             nodep->v3warn(E_UNSUPPORTED, "Unsupported: Incrementation in this context.");
             return;
diff --git a/src/V3Options.cpp b/src/V3Options.cpp
index 49a65e5ac..52b24f349 100644
--- a/src/V3Options.cpp
+++ b/src/V3Options.cpp
@@ -815,7 +815,7 @@ string V3Options::protectKeyDefaulted() {
 void V3Options::throwSigsegv() {  // LCOV_EXCL_START
 #if !(defined(VL_CPPCHECK) || defined(__clang_analyzer__))
     // clang-format off
-    { char* zp = nullptr; *zp = 0; }  // Intentional core dump, ignore warnings here
+    *static_cast<volatile char*>(nullptr) = 0;  // Intentional core dump, ignore warnings here
     // clang-format on
 #endif
 }  // LCOV_EXCL_STOP

From e6e7bd8d832c8714b79e9cfb3ba24a38c0b075b4 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sat, 12 Jun 2021 20:46:08 +0100
Subject: [PATCH 03/73] Compile the debug build with -Og -ggdb -gz if
 supported.

Check the C++ compiler for -Og via configure and use it if available.

Per the GCC manual:
-Og should be the optimization level of choice for the standard
edit-compile-debug cycle, offering a reasonable level of optimization
while maintaining fast compilation and a good debugging experience. It
is a better choice than -O0 for producing debuggable code because some
compiler passes that collect debug information are disabled at -O0.

The debug exe is painfully slow on large designs, hopefully this is an
improvement.

Similarly, check for and use -gz to compress the debug info as it is
huge otherwise. This should help with distribution and caching on CI.

Also checks for -ggdb via configure for compatibility.
---
 configure.ac        | 10 ++++++++++
 src/Makefile_obj.in |  9 +++------
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/configure.ac b/configure.ac
index 9973fe8fe..90bce2208 100644
--- a/configure.ac
+++ b/configure.ac
@@ -322,6 +322,16 @@ _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_PARSER,-Wno-parentheses-equality)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_PARSER,-Wno-unused)
 AC_SUBST(CFG_CXXFLAGS_PARSER)
 
+# Flags for compiling the debug version of Verilator (in addition to above CFG_CXXFLAGS_SRC)
+_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DEBUG,-Og)
+_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DEBUG,-ggdb)
+_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DEBUG,-gz)
+AC_SUBST(CFG_CXXFLAGS_DEBUG)
+
+# Flags for linking the debug version of Verilator (in addition to above CFG_LDFLAGS_SRC)
+_MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_DEBUG,-gz)
+AC_SUBST(CFG_LDFLAGS_DEBUG)
+
 # Flags for Verilated makefile
 # For example, -Wno-div-by-zero isn't in 4.1.2
 # Random code often does / 0.  Unfortunately VL_DIV_I(0,0) will warn
diff --git a/src/Makefile_obj.in b/src/Makefile_obj.in
index fcd977e14..5fc473131 100644
--- a/src/Makefile_obj.in
+++ b/src/Makefile_obj.in
@@ -77,13 +77,11 @@ TGT = ../../verilator_bin$(EXEEXT)
 #################
 ifeq ($(VL_DEBUG),)
 # Optimize
-COPT = -O2
+CPPFLAGS += -O2
 else
 # Debug
-COPT = -ggdb -DVL_DEBUG -D_GLIBCXX_DEBUG
-# Debug & Profile:
-#LDFLAGS += -pg -g
-#COPT = -ggdb -pg -g
+CPPFLAGS += @CFG_CXXFLAGS_DEBUG@ -DVL_DEBUG -D_GLIBCXX_DEBUG
+LDFLAGS += @CFG_LDFLAGS_DEBUG@
 endif
 #################
 
@@ -96,7 +94,6 @@ LIBS = $(CFG_LIBS) -lm
 CPPFLAGS += -MMD
 CPPFLAGS += -I. -I$(bldsrc) -I$(srcdir) -I$(incdir) -I../../include
 #CPPFLAGS += -DVL_LEAK_CHECKS 	# If running valgrind or other hunting tool
-CPPFLAGS += $(COPT)
 CPPFLAGS += -MP # Only works on recent GCC versions
 ifeq ($(CFG_WITH_CCWARN),yes)	# Local... Else don't burden users
 CPPFLAGS += -W -Wall $(CFG_CXXFLAGS_WEXTRA) $(CFG_CXXFLAGS_SRC) -Werror

From 02835f199b32065544ecfb2d7be6c38ce30c8ef3 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sat, 12 Jun 2021 23:35:18 +0100
Subject: [PATCH 04/73] CI: Improve caching

GitHub Actions allow a total 5 GB of cache storage space per repository,
after which it will evict old caches. Tweaked cache sizes so master + a
few PRs can fit at the same time. Don't cache coverage builds as they
run weekly and with additional compiler options, so their caches would
likely be state anyway.
---
 .github/workflows/build.yml    | 30 ++++++++++++++++--------------
 .github/workflows/coverage.yml | 28 ----------------------------
 2 files changed, 16 insertions(+), 42 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index fba21f0da..05265cf5d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -56,21 +56,22 @@ jobs:
       CI_MAKE_SRC_TARGET: ${{ matrix.debug }}
       CC: ${{ matrix.compiler.cc }}
       CXX: ${{ matrix.compiler.cxx }}
-      CACHE_KEY: build-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.debug }}
-      CCACHE_MAXSIZE: 256Mi # Per build matrix entry
+      CACHE_BASE_KEY: build-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.debug }}
+      CCACHE_MAXSIZE: 128Mi # Per build matrix entry (1Gi in total)
     steps:
 
     - name: Checkout
       uses: actions/checkout@v2
 
-    - name: Cache
+    - name: Cache $CCACHE_DIR
       uses: actions/cache@v2
       env:
-        cache-name: ccache
+        CACHE_KEY: ${{ env.CACHE_BASE_KEY }}-ccache
       with:
-        path: ${{ github.workspace }}/.ccache
-        key: ${{ env.CACHE_KEY }}-${{ env.cache-name }}-${{ github.sha }}
-        restore-keys: ${{ env.CACHE_KEY }}-${{ env.cache-name }}
+        path: ${{ env.CCACHE_DIR }}
+        key: ${{ env.CACHE_KEY }}-${{ github.sha }}
+        restore-keys: |
+          ${{ env.CACHE_KEY }}-
 
     - name: Install packages for build
       run: ./ci/ci-install.bash
@@ -109,21 +110,22 @@ jobs:
       CI_RUNS_ON: ${{ matrix.os }}
       CC: ${{ matrix.compiler.cc }}
       CXX: ${{ matrix.compiler.cxx }}
-      CACHE_KEY: test-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.suite }}
-      CCACHE_MAXSIZE: 256Mi # Per build matrix entry
+      CACHE_BASE_KEY: test-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.suite }}
+      CCACHE_MAXSIZE: 32Mi # Per build matrix entry (960Mi in total)
     steps:
 
     - name: Checkout
       uses: actions/checkout@v2
 
-    - name: Cache
+    - name: Cache $CCACHE_DIR
       uses: actions/cache@v2
       env:
-        cache-name: ccache
+        CACHE_KEY: ${{ env.CACHE_BASE_KEY }}-ccache
       with:
-        path: ${{ github.workspace }}/.ccache
-        key: ${{ env.CACHE_KEY }}-${{ env.cache-name }}-${{ github.sha }}
-        restore-keys: ${{ env.CACHE_KEY }}-${{ env.cache-name }}
+        path: ${{ env.CCACHE_DIR }}
+        key: ${{ env.CACHE_KEY }}-${{ github.sha }}
+        restore-keys: |
+          ${{ env.CACHE_KEY }}-
 
     - uses: actions/download-artifact@v2
 
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 42c0d40cb..6ba5810d7 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -11,8 +11,6 @@ on:
 env:
   CI_OS_NAME: linux
   CI_COMMIT: ${{ github.sha }}
-  CCACHE_COMPRESS: 1
-  CCACHE_DIR: ${{ github.workspace }}/.ccache
   COVERAGE: 1
 
 jobs:
@@ -23,22 +21,11 @@ jobs:
     env:
       CI_BUILD_STAGE_NAME: build
       CI_RUNS_ON: ubuntu-20.04
-      CACHE_KEY: coverage-build
-      CCACHE_MAXSIZE: 512Mi
     steps:
 
     - name: Checkout
       uses: actions/checkout@v2
 
-    - name: Cache
-      uses: actions/cache@v2
-      env:
-        cache-name: ccache
-      with:
-        path: ${{ github.workspace }}/.ccache
-        key: ${{ env.CACHE_KEY }}-${{ env.cache-name }}-${{ github.sha }}
-        restore-keys: ${{ env.CACHE_KEY }}-${{ env.cache-name }}
-
     - name: Install packages for build
       env:
         CI_BUILD_STAGE_NAME: build
@@ -46,9 +33,7 @@ jobs:
 
     - name: Build
       run: |
-        ccache -z
         ./ci/ci-script.bash
-        ccache -s
         tar cvzf verilator-${CI_COMMIT}-coverage.tgz bin src/obj*/*.o src/obj*/*.gcno
 
     - uses: actions/upload-artifact@v2
@@ -82,22 +67,11 @@ jobs:
     env:
       CI_BUILD_STAGE_NAME: test
       CI_RUNS_ON: ubuntu-20.04
-      CACHE_KEY: coverage-test-${{ matrix.test }}${{ matrix.num }}
-      CCACHE_MAXSIZE: 512Mi # Per build matrix entry
     steps:
 
     - name: Checkout
       uses: actions/checkout@v2
 
-    - name: Cache
-      uses: actions/cache@v2
-      env:
-        cache-name: ccache
-      with:
-        path: ${{ github.workspace }}/.ccache
-        key: ${{ env.CACHE_KEY }}-${{ env.cache-name }}-${{ github.sha }}
-        restore-keys: ${{ env.CACHE_KEY }}-${{ env.cache-name }}
-
     - uses: actions/download-artifact@v2
 
     - name: Install Verilator and test dependencies
@@ -110,6 +84,4 @@ jobs:
       env:
         TESTS: coverage-${{ matrix.test }}${{ matrix.num }}
       run: |
-        ccache -z
         ./ci/ci-script.bash
-        ccache -s

From 2d2bd5b95e3a086949e22efe0e1d302dbb8581d8 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sun, 13 Jun 2021 01:05:42 +0100
Subject: [PATCH 05/73] CI: Upload separate named artifacts, only fetch ones
 that are needed

---
 .github/workflows/build.yml    | 30 ++++++++++++++++++++++--------
 .github/workflows/coverage.yml | 23 ++++++++++++++++-------
 2 files changed, 38 insertions(+), 15 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 05265cf5d..f9d9ef934 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -58,6 +58,7 @@ jobs:
       CXX: ${{ matrix.compiler.cxx }}
       CACHE_BASE_KEY: build-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.debug }}
       CCACHE_MAXSIZE: 128Mi # Per build matrix entry (1Gi in total)
+      VERILATOR_ARCHIVE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.debug }}.tar.gz
     steps:
 
     - name: Checkout
@@ -81,11 +82,13 @@ jobs:
         ccache -z
         ./ci/ci-script.bash
         ccache -s
-        tar cvzf verilator-${{ matrix.os}}-${CI_COMMIT}-${{ matrix.compiler.cc }}-${{ matrix.debug }}.tgz ./bin
+        tar cvzf ${{ env.VERILATOR_ARCHIVE }} bin
 
-    - uses: actions/upload-artifact@v2
+    - name: Upload Verilator artifact
+      uses: actions/upload-artifact@v2
       with:
-        path: verilator-${{ matrix.os}}-${{ env.CI_COMMIT }}-${{ matrix.compiler.cc }}-${{ matrix.debug }}.tgz
+        name: ${{ env.VERILATOR_ARCHIVE }}
+        path: ${{ env.VERILATOR_ARCHIVE }}
 
 
   Test:
@@ -112,6 +115,7 @@ jobs:
       CXX: ${{ matrix.compiler.cxx }}
       CACHE_BASE_KEY: test-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.suite }}
       CCACHE_MAXSIZE: 32Mi # Per build matrix entry (960Mi in total)
+      VERILATOR_ARCHIVE_BASE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}
     steps:
 
     - name: Checkout
@@ -127,13 +131,23 @@ jobs:
         restore-keys: |
           ${{ env.CACHE_KEY }}-
 
-    - uses: actions/download-artifact@v2
+    - name: Download Verilator artifact (opt)
+      uses: actions/download-artifact@v2
+      with:
+        name: ${{ env.VERILATOR_ARCHIVE_BASE }}-opt.tar.gz
 
-    - name: Install Verilator and test dependencies
+    - name: Download Verilator artifact (dbg)
+      uses: actions/download-artifact@v2
+      with:
+        name: ${{ env.VERILATOR_ARCHIVE_BASE }}-dbg.tar.gz
+
+    - name: Unpack Verilator artifacts
+      run: |
+        tar xvzf ${{ env.VERILATOR_ARCHIVE_BASE }}-opt.tar.gz
+        tar xvzf ${{ env.VERILATOR_ARCHIVE_BASE }}-dbg.tar.gz
+
+    - name: Install test dependencies
       run: |
-        tar xvzf artifact/verilator-${{ matrix.os}}-${CI_COMMIT}-${{ matrix.compiler.cc }}-opt.tgz
-        tar xvzf artifact/verilator-${{ matrix.os}}-${CI_COMMIT}-${{ matrix.compiler.cc }}-dbg.tgz
-        rm -rf artifact
         ./ci/ci-install.bash
 
     - name: Test
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 6ba5810d7..fb6dcd862 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -12,6 +12,7 @@ env:
   CI_OS_NAME: linux
   CI_COMMIT: ${{ github.sha }}
   COVERAGE: 1
+  VERILATOR_ARCHIVE: verilator-coverage-${{ github.sha }}.tar.gz
 
 jobs:
 
@@ -34,11 +35,13 @@ jobs:
     - name: Build
       run: |
         ./ci/ci-script.bash
-        tar cvzf verilator-${CI_COMMIT}-coverage.tgz bin src/obj*/*.o src/obj*/*.gcno
+        tar cvzf ${{ env.VERILATOR_ARCHIVE }} bin src/obj*/*.o src/obj*/*.gcno
 
-    - uses: actions/upload-artifact@v2
-      with:
-        path: verilator-${{ env.CI_COMMIT }}-coverage.tgz
+    - name: Upload Verilator artifact
+      uses: actions/upload-artifact@v2
+        with:
+          name: ${{ env.VERILATOR_ARCHIVE }}
+          path: ${{ env.VERILATOR_ARCHIVE }}
 
 
   Test:
@@ -72,12 +75,18 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v2
 
-    - uses: actions/download-artifact@v2
+    - name: Download Verilator artifact
+      uses: actions/download-artifact@v2
+      with:
+        name: ${{ env.VERILATOR_ARCHIVE }}
 
-    - name: Install Verilator and test dependencies
+    - name: Unapack Verilator artifact
       run: |
-        tar xvzf artifact/verilator-${CI_COMMIT}-coverage.tgz
+        tar xvzf ${{ env.VERILATOR_ARCHIVE }}
         touch src/obj*/*.o src/obj*/*.gcno
+
+    - name: Install test dependencies
+      run: |
         ./ci/ci-install.bash
 
     - name: Test

From c67fe02f069a76a24e886b66c040b3b14535754a Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sun, 13 Jun 2021 02:29:11 +0100
Subject: [PATCH 06/73] Do not generate debug info in tests

Pointless and takes up a lot of cache space in CI, so remove -ggdb and
associated debug options from tests.
---
 test_regress/t/t_clk_inp_init.pl             | 2 +-
 test_regress/t/t_math_shift_rep.pl           | 1 -
 test_regress/t/t_vpi_get.pl                  | 2 +-
 test_regress/t/t_vpi_get_public_rw_switch.pl | 2 +-
 test_regress/t/t_vpi_memory.pl               | 2 +-
 test_regress/t/t_vpi_module.pl               | 2 +-
 test_regress/t/t_vpi_module_dpi.pl           | 2 +-
 test_regress/t/t_vpi_param.pl                | 2 +-
 test_regress/t/t_vpi_time_cb.pl              | 2 +-
 test_regress/t/t_vpi_unimpl.pl               | 2 +-
 test_regress/t/t_vpi_var.pl                  | 2 +-
 test_regress/t/t_vpi_zero_time_cb.pl         | 2 +-
 12 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/test_regress/t/t_clk_inp_init.pl b/test_regress/t/t_clk_inp_init.pl
index 079c16ec0..a55bf1710 100755
--- a/test_regress/t/t_clk_inp_init.pl
+++ b/test_regress/t/t_clk_inp_init.pl
@@ -11,7 +11,7 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 scenarios(simulator => 1);
 
 compile(make_main => 0,
-        verilator_flags2 => ["-CFLAGS -g3 --exe $Self->{t_dir}/$Self->{name}.cpp"]);
+        verilator_flags2 => ["--exe $Self->{t_dir}/$Self->{name}.cpp"]);
 
 execute(check_finished => 1);
 
diff --git a/test_regress/t/t_math_shift_rep.pl b/test_regress/t/t_math_shift_rep.pl
index 664c428d8..b46d46042 100755
--- a/test_regress/t/t_math_shift_rep.pl
+++ b/test_regress/t/t_math_shift_rep.pl
@@ -11,7 +11,6 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 scenarios(simulator => 1);
 
 compile(
-    verilator_flags2 => ["-CFLAGS '-DVL_DEBUG -ggdb -O0'"],
     );
 
 execute(
diff --git a/test_regress/t/t_vpi_get.pl b/test_regress/t/t_vpi_get.pl
index c3f9a81c0..faf3e678c 100755
--- a/test_regress/t/t_vpi_get.pl
+++ b/test_regress/t/t_vpi_get.pl
@@ -16,7 +16,7 @@ skip("Known compiler limitation")
 compile(
     make_top_shell => 0,
     make_main => 0,
-    verilator_flags2 => ["-CFLAGS '-DVL_DEBUG -ggdb' --exe --vpi --no-l2name $Self->{t_dir}/t_vpi_get.cpp"],
+    verilator_flags2 => ["--exe --vpi --no-l2name $Self->{t_dir}/t_vpi_get.cpp"],
     make_pli => 1,
     iv_flags2 => ["-g2005-sv -D USE_VPI_NOT_DPI"],
     v_flags2 => ["+define+USE_VPI_NOT_DPI +define+VERILATOR_COMMENTS"],
diff --git a/test_regress/t/t_vpi_get_public_rw_switch.pl b/test_regress/t/t_vpi_get_public_rw_switch.pl
index 3a5cdf231..2142c3afc 100755
--- a/test_regress/t/t_vpi_get_public_rw_switch.pl
+++ b/test_regress/t/t_vpi_get_public_rw_switch.pl
@@ -20,7 +20,7 @@ pli_filename("t_vpi_get.cpp");
 compile(
     make_top_shell => 0,
     make_main => 0,
-    verilator_flags2 => ["-CFLAGS '-DVL_DEBUG -ggdb' --exe --vpi"
+    verilator_flags2 => ["--exe --vpi"
                          ." --public-flat-rw --prefix Vt_vpi_get --no-l2name"
                          ." $Self->{t_dir}/t_vpi_get.cpp"],
     make_pli => 1,
diff --git a/test_regress/t/t_vpi_memory.pl b/test_regress/t/t_vpi_memory.pl
index 9b95b19c4..c806cf940 100755
--- a/test_regress/t/t_vpi_memory.pl
+++ b/test_regress/t/t_vpi_memory.pl
@@ -19,7 +19,7 @@ compile(
     make_pli => 1,
     iv_flags2 => ["-g2005-sv -D USE_VPI_NOT_DPI"],
     v_flags2 => ["+define+USE_VPI_NOT_DPI"],
-    verilator_flags2 => ["-CFLAGS '-DVL_DEBUG -ggdb' --exe --vpi --no-l2name $Self->{t_dir}/t_vpi_memory.cpp"],
+    verilator_flags2 => ["--exe --vpi --no-l2name $Self->{t_dir}/t_vpi_memory.cpp"],
     );
 
 execute(
diff --git a/test_regress/t/t_vpi_module.pl b/test_regress/t/t_vpi_module.pl
index a1835cb60..fe539483b 100755
--- a/test_regress/t/t_vpi_module.pl
+++ b/test_regress/t/t_vpi_module.pl
@@ -18,7 +18,7 @@ compile(
     make_main => 0,
     make_pli => 1,
     iv_flags2 => ["-g2005-sv"],
-    verilator_flags2 => ["-CFLAGS '-DVL_DEBUG -ggdb' +define+USE_DOLLAR_C32 --exe --vpi --no-l2name $Self->{t_dir}/t_vpi_module.cpp"],
+    verilator_flags2 => ["+define+USE_DOLLAR_C32 --exe --vpi --no-l2name $Self->{t_dir}/t_vpi_module.cpp"],
     );
 
 execute(
diff --git a/test_regress/t/t_vpi_module_dpi.pl b/test_regress/t/t_vpi_module_dpi.pl
index 1a546432b..25189b715 100755
--- a/test_regress/t/t_vpi_module_dpi.pl
+++ b/test_regress/t/t_vpi_module_dpi.pl
@@ -22,7 +22,7 @@ compile(
     make_main => 0,
     make_pli => 1,
     iv_flags2 => ["-g2005-sv"],
-    verilator_flags2 => ["-CFLAGS '-DVL_DEBUG -ggdb' --exe --vpi --no-l2name $Self->{t_dir}/t_vpi_module.cpp"],
+    verilator_flags2 => ["--exe --vpi --no-l2name $Self->{t_dir}/t_vpi_module.cpp"],
     );
 
 execute(
diff --git a/test_regress/t/t_vpi_param.pl b/test_regress/t/t_vpi_param.pl
index e5c448b01..feea273d1 100755
--- a/test_regress/t/t_vpi_param.pl
+++ b/test_regress/t/t_vpi_param.pl
@@ -19,7 +19,7 @@ compile(
     make_pli => 1,
     iv_flags2 => ["-g2005-sv -D USE_VPI_NOT_DPI"],
     v_flags2 => ["+define+USE_VPI_NOT_DPI"],
-    verilator_flags2 => ["-CFLAGS '-DVL_DEBUG -ggdb' --exe --vpi --no-l2name $Self->{t_dir}/t_vpi_param.cpp"],
+    verilator_flags2 => ["--exe --vpi --no-l2name $Self->{t_dir}/t_vpi_param.cpp"],
     );
 
 execute(
diff --git a/test_regress/t/t_vpi_time_cb.pl b/test_regress/t/t_vpi_time_cb.pl
index ec265a4e2..ab1608097 100755
--- a/test_regress/t/t_vpi_time_cb.pl
+++ b/test_regress/t/t_vpi_time_cb.pl
@@ -16,7 +16,7 @@ compile(
     sim_time => 2100,
     v_flags2 => ["t/t_vpi_time_cb_c.cpp"],
     iv_flags2 => ["-g2005-sv -DWAVES -DIVERILOG"],
-    verilator_flags2 => ["-CFLAGS '-DVL_DEBUG -ggdb' --exe --vpi --no-l2name $Self->{t_dir}/t_vpi_time_cb.cpp"],
+    verilator_flags2 => ["--exe --vpi --no-l2name $Self->{t_dir}/t_vpi_time_cb.cpp"],
     );
 
 execute(
diff --git a/test_regress/t/t_vpi_unimpl.pl b/test_regress/t/t_vpi_unimpl.pl
index dce3e4aae..2fdc5f638 100755
--- a/test_regress/t/t_vpi_unimpl.pl
+++ b/test_regress/t/t_vpi_unimpl.pl
@@ -13,7 +13,7 @@ scenarios(simulator => 1);
 compile(
     make_top_shell => 0,
     make_main => 0,
-    verilator_flags2 => ["-CFLAGS '-DVL_DEBUG -ggdb' --exe --vpi --no-l2name $Self->{t_dir}/t_vpi_unimpl.cpp"],
+    verilator_flags2 => ["--exe --vpi --no-l2name $Self->{t_dir}/t_vpi_unimpl.cpp"],
     );
 
 execute(
diff --git a/test_regress/t/t_vpi_var.pl b/test_regress/t/t_vpi_var.pl
index e9f2bac65..1788e06cd 100755
--- a/test_regress/t/t_vpi_var.pl
+++ b/test_regress/t/t_vpi_var.pl
@@ -17,7 +17,7 @@ compile(
     sim_time => 2100,
     iv_flags2 => ["-g2005-sv -D USE_VPI_NOT_DPI -DWAVES"],
     v_flags2 => ["+define+USE_VPI_NOT_DPI"],
-    verilator_flags2 => ["-CFLAGS '-DVL_DEBUG -ggdb' --exe --vpi --no-l2name $Self->{t_dir}/t_vpi_var.cpp"],
+    verilator_flags2 => ["--exe --vpi --no-l2name $Self->{t_dir}/t_vpi_var.cpp"],
     );
 
 execute(
diff --git a/test_regress/t/t_vpi_zero_time_cb.pl b/test_regress/t/t_vpi_zero_time_cb.pl
index d2e13ef9c..d29050de0 100755
--- a/test_regress/t/t_vpi_zero_time_cb.pl
+++ b/test_regress/t/t_vpi_zero_time_cb.pl
@@ -16,7 +16,7 @@ compile(
     sim_time => 2100,
     iv_flags2 => ["-g2005-sv -D USE_VPI_NOT_DPI -DWAVES -DIVERILOG"],
     v_flags2 => ["+define+USE_VPI_NOT_DPI"],
-    verilator_flags2 => ["-CFLAGS '-DVL_DEBUG -ggdb' --exe --vpi --no-l2name $Self->{t_dir}/t_vpi_zero_time_cb.cpp -LDFLAGS '-ldl -rdynamic'"],
+    verilator_flags2 => ["--exe --vpi --no-l2name $Self->{t_dir}/t_vpi_zero_time_cb.cpp -LDFLAGS '-ldl -rdynamic'"],
     );
 
 execute(

From cd871ca79ec5fa358a39dd73162f51bb8ac607db Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sun, 13 Jun 2021 01:25:10 +0100
Subject: [PATCH 07/73] CI: Increase cache sizes slightly

---
 .github/workflows/build.yml | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f9d9ef934..4105e60da 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -16,6 +16,7 @@ env:
   CI_COMMIT: ${{ github.sha }}
   CCACHE_COMPRESS: 1
   CCACHE_DIR: ${{ github.workspace }}/.ccache
+  CCACHE_LIMIT_MULTIPLE: 0.95
 
 jobs:
 
@@ -44,21 +45,23 @@ jobs:
       fail-fast: false
       matrix:
         os: ${{ fromJson(needs.Matrix.outputs.matrix) }}
-        debug: [ opt, dbg ]
+        target:
+          - { name: opt, ccache_size: 48M  }
+          - { name: dbg, ccache_size: 208M }
         compiler:
           - { cc: clang, cxx: clang++ }
           - { cc: gcc,   cxx: g++     }
     runs-on: ${{ matrix.os }}
-    name: Build | ${{ matrix.os }} | ${{ matrix.compiler.cc }} | ${{ matrix.debug }}
+    name: Build | ${{ matrix.os }} | ${{ matrix.compiler.cc }} | ${{ matrix.target.name }}
     env:
       CI_BUILD_STAGE_NAME: build
       CI_RUNS_ON: ${{ matrix.os }}
-      CI_MAKE_SRC_TARGET: ${{ matrix.debug }}
+      CI_MAKE_SRC_TARGET: ${{ matrix.target.name }}
       CC: ${{ matrix.compiler.cc }}
       CXX: ${{ matrix.compiler.cxx }}
-      CACHE_BASE_KEY: build-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.debug }}
-      CCACHE_MAXSIZE: 128Mi # Per build matrix entry (1Gi in total)
-      VERILATOR_ARCHIVE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.debug }}.tar.gz
+      CACHE_BASE_KEY: build-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.target.name }}
+      CCACHE_MAXSIZE: ${{ matrix.target.ccache_size }} # Per build matrix entry (1G in total)
+      VERILATOR_ARCHIVE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.target.name }}.tar.gz
     steps:
 
     - name: Checkout
@@ -114,7 +117,7 @@ jobs:
       CC: ${{ matrix.compiler.cc }}
       CXX: ${{ matrix.compiler.cxx }}
       CACHE_BASE_KEY: test-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.suite }}
-      CCACHE_MAXSIZE: 32Mi # Per build matrix entry (960Mi in total)
+      CCACHE_MAXSIZE: 64M # Per build matrix entry (1920M in total)
       VERILATOR_ARCHIVE_BASE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}
     steps:
 

From 18cabc369b815b2610a025079f601894b31db003 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sun, 13 Jun 2021 02:48:33 +0100
Subject: [PATCH 08/73] CI: fix error in coverage workflow file

---
 .github/workflows/coverage.yml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index fb6dcd862..fdbe90e85 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -39,9 +39,9 @@ jobs:
 
     - name: Upload Verilator artifact
       uses: actions/upload-artifact@v2
-        with:
-          name: ${{ env.VERILATOR_ARCHIVE }}
-          path: ${{ env.VERILATOR_ARCHIVE }}
+      with:
+        name: ${{ env.VERILATOR_ARCHIVE }}
+        path: ${{ env.VERILATOR_ARCHIVE }}
 
 
   Test:

From 60d5f0e86be03181b008c4f5f144c3ada5f4a71c Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sun, 13 Jun 2021 14:33:11 +0100
Subject: [PATCH 09/73] Emit model implementation as loose methods. (#3006)

This patch introduces the concept of 'loose' methods, which semantically
are methods, but are declared as global functions, and are passed an
explicit 'self' pointer. This enables these methods to be declared
outside the class, only when they are needed, therefore removing the
header dependency. The bulk of the emitted model implementation now uses
loose methods.
---
 Changes                                       |   5 +
 docs/guide/extensions.rst                     |   7 +-
 include/verilated_threads.cpp                 |   2 +-
 include/verilated_threads.h                   |  20 +-
 src/V3Active.cpp                              |   5 +-
 src/V3Ast.h                                   |  33 +-
 src/V3AstNodes.cpp                            |  43 +-
 src/V3AstNodes.h                              |  51 +-
 src/V3CCtors.cpp                              |  32 +-
 src/V3Changed.cpp                             |   9 +-
 src/V3Clock.cpp                               |  72 +-
 src/V3Combine.cpp                             |  23 +-
 src/V3DepthBlock.cpp                          |  11 +-
 src/V3Descope.cpp                             | 122 ++--
 src/V3EmitC.cpp                               | 638 +++++++++++-------
 src/V3EmitCBase.h                             |  60 +-
 src/V3EmitV.cpp                               |   9 +-
 src/V3File.cpp                                |   9 +-
 src/V3File.h                                  |   3 +
 src/V3Hasher.cpp                              |  11 +-
 src/V3Localize.cpp                            |   3 +-
 src/V3Order.cpp                               |   5 +-
 src/V3String.cpp                              |  17 +
 src/V3String.h                                |   4 +
 src/V3Task.cpp                                |  32 +-
 src/V3Trace.cpp                               |  51 +-
 src/V3TraceDecl.cpp                           |  10 +-
 test_regress/t/t_c_this.pl                    |  27 +
 test_regress/t/t_c_this.v                     |  15 +
 .../t/t_class_extends_this_protect_ids.pl     |  33 +
 test_regress/t/t_cover_line.out               |   2 +-
 test_regress/t/t_cover_line.v                 |   2 +-
 test_regress/t/t_debug_emitv.out              |   6 -
 test_regress/t/t_dpi_var.v                    |   2 +-
 test_regress/t/t_extend.v                     |   2 +-
 test_regress/t/t_extend_class.v               |   2 +-
 test_regress/t/t_flag_csplit.pl               |   1 +
 test_regress/t/t_flag_csplit_eval.pl          |   2 +-
 test_regress/t/t_func_public.v                |  28 +-
 test_regress/t/t_func_rand.v                  |   2 +-
 test_regress/t/t_inst_tree_inl0_pub1.pl       |  13 +-
 .../t/t_inst_tree_inl0_pub1_norelcfuncs.pl    |  11 +-
 test_regress/t/t_param_public.v               |   4 +-
 test_regress/t/t_protect_ids_key.out          |   3 +-
 .../t/t_unopt_converge_initial_run_bad.out    |   2 +-
 test_regress/t/t_unopt_converge_print_bad.out |   2 +-
 test_regress/t/t_unopt_converge_run_bad.out   |   2 +-
 test_regress/t/t_verilated_debug.out          |  39 +-
 48 files changed, 916 insertions(+), 571 deletions(-)
 create mode 100755 test_regress/t/t_c_this.pl
 create mode 100644 test_regress/t/t_c_this.v
 create mode 100755 test_regress/t/t_class_extends_this_protect_ids.pl

diff --git a/Changes b/Changes
index bbefbafeb..e9cb910f9 100644
--- a/Changes
+++ b/Changes
@@ -11,6 +11,11 @@ contributors that suggested a given feature are shown in []. Thanks!
 Verilator 4.205 devel
 ==========================
 
+**Major:**
+
+* Generated code is now emitted as global functions rather than methods. '$c'
+  contents might need to be updated, see the docs (#3006). [Geza Lore]
+
 **Minor:**
 
 
diff --git a/docs/guide/extensions.rst b/docs/guide/extensions.rst
index 1d0cbf0f7..c82c89adb 100644
--- a/docs/guide/extensions.rst
+++ b/docs/guide/extensions.rst
@@ -33,7 +33,12 @@ or "`ifdef`"'s may break other tools.
    that returns up to a 32-bit number (without a trailing ;). This can be
    used to call C++ functions from your Verilog code.
 
-   String arguments will be put directly into the output C++ code.
+   String arguments will be put directly into the output C++ code, except
+   the word 'this' (i.e.: the object pointer) might be replaced with a
+   different pointer as Verilator might implement logic with non-member
+   functions. For this reason, any references to class members must be made
+   via an explicit 'this->' pointer dereference.
+
    Expression arguments will have the code to evaluate the expression
    inserted.  Thus to call a C++ function, :code:`$c("func(",a,")")` will
    result in :code:`func(a)` in the output C++ code.  For input arguments,
diff --git a/include/verilated_threads.cpp b/include/verilated_threads.cpp
index 49e2f2624..a4e2bfb73 100644
--- a/include/verilated_threads.cpp
+++ b/include/verilated_threads.cpp
@@ -74,7 +74,7 @@ void VlWorkerThread::workerLoop() {
         if (VL_UNLIKELY(m_exiting.load(std::memory_order_acquire))) break;
 
         if (VL_LIKELY(work.m_fnp)) {
-            work.m_fnp(work.m_evenCycle, work.m_sym);
+            work.m_fnp(work.m_selfp, work.m_evenCycle);
             work.m_fnp = nullptr;
         }
     }
diff --git a/include/verilated_threads.h b/include/verilated_threads.h
index 3416ae965..e01315646 100644
--- a/include/verilated_threads.h
+++ b/include/verilated_threads.h
@@ -48,12 +48,12 @@
 #endif
 // clang-format on
 
-// VlMTaskVertex and VlThreadpool will work with multiple symbol table types.
+// VlMTaskVertex and VlThreadpool will work with multiple model class types.
 // Since the type is opaque to VlMTaskVertex and VlThreadPool, represent it
 // as a void* here.
-using VlThrSymTab = void*;
+using VlSelfP = void*;
 
-using VlExecFnp = void (*)(bool, VlThrSymTab);
+using VlExecFnp = void (*)(VlSelfP, bool);
 
 // Track dependencies for a single MTask.
 class VlMTaskVertex final {
@@ -177,15 +177,15 @@ private:
     // TYPES
     struct ExecRec {
         VlExecFnp m_fnp;  // Function to execute
-        VlThrSymTab m_sym;  // Symbol table to execute
+        VlSelfP m_selfp;  // Symbol table to execute
         bool m_evenCycle;  // Even/odd for flag alternation
         ExecRec()
             : m_fnp{nullptr}
-            , m_sym{nullptr}
+            , m_selfp{nullptr}
             , m_evenCycle{false} {}
-        ExecRec(VlExecFnp fnp, bool evenCycle, VlThrSymTab sym)
+        ExecRec(VlExecFnp fnp, VlSelfP selfp, bool evenCycle)
             : m_fnp{fnp}
-            , m_sym{sym}
+            , m_selfp{selfp}
             , m_evenCycle{evenCycle} {}
     };
 
@@ -237,13 +237,13 @@ public:
         m_ready.erase(m_ready.begin());
         m_ready_size.fetch_sub(1, std::memory_order_relaxed);
     }
-    inline void wakeUp() { addTask(nullptr, false, nullptr); }
-    inline void addTask(VlExecFnp fnp, bool evenCycle, VlThrSymTab sym)
+    inline void wakeUp() { addTask(nullptr, nullptr, false); }
+    inline void addTask(VlExecFnp fnp, VlSelfP selfp, bool evenCycle)
         VL_MT_SAFE_EXCLUDES(m_mutex) {
         bool notify;
         {
             const VerilatedLockGuard lk(m_mutex);
-            m_ready.emplace_back(fnp, evenCycle, sym);
+            m_ready.emplace_back(fnp, selfp, evenCycle);
             m_ready_size.fetch_add(1, std::memory_order_relaxed);
             notify = m_waiting;
         }
diff --git a/src/V3Active.cpp b/src/V3Active.cpp
index 3e9ee98ad..ee7debb29 100644
--- a/src/V3Active.cpp
+++ b/src/V3Active.cpp
@@ -474,11 +474,10 @@ private:
         if (!m_scopeFinalp) {
             m_scopeFinalp = new AstCFunc(
                 nodep->fileline(), "_final_" + m_namer.scopep()->nameDotless(), m_namer.scopep());
-            m_scopeFinalp->argTypes(EmitCBaseVisitor::symClassVar());
-            m_scopeFinalp->addInitsp(
-                new AstCStmt(nodep->fileline(), EmitCBaseVisitor::symTopAssign() + "\n"));
             m_scopeFinalp->dontCombine(true);
             m_scopeFinalp->formCallTree(true);
+            m_scopeFinalp->isStatic(false);
+            m_scopeFinalp->isLoose(true);
             m_scopeFinalp->slow(true);
             m_namer.scopep()->addActivep(m_scopeFinalp);
         }
diff --git a/src/V3Ast.h b/src/V3Ast.h
index 1753b7075..a8628dee1 100644
--- a/src/V3Ast.h
+++ b/src/V3Ast.h
@@ -1687,6 +1687,7 @@ public:
     AstNodeDType* findSigned32DType() { return findBasicDType(AstBasicDTypeKwd::INTEGER); }
     AstNodeDType* findUInt32DType() { return findBasicDType(AstBasicDTypeKwd::UINT32); }
     AstNodeDType* findUInt64DType() { return findBasicDType(AstBasicDTypeKwd::UINT64); }
+    AstNodeDType* findCHandleDType() { return findBasicDType(AstBasicDTypeKwd::CHANDLE); }
     AstNodeDType* findVoidDType() const;
     AstNodeDType* findQueueIndexDType() const;
     AstNodeDType* findBitDType(int width, int widthMin, VSigning numeric) const;
@@ -2272,9 +2273,9 @@ private:
     AstVarScope* m_varScopep = nullptr;  // Varscope for hierarchy
     AstNodeModule* m_classOrPackagep = nullptr;  // Package hierarchy
     string m_name;  // Name of variable
-    string m_hiernameToProt;  // Scope converted into name-> for emitting
-    string m_hiernameToUnprot;  // Scope converted into name-> for emitting
-    bool m_hierThis = false;  // Hiername points to "this" function
+    string m_selfPointer;  // Output code object pointer (e.g.: 'this')
+    string m_classPrefix;  // Output class prefix (i.e.: the part before ::)
+    bool m_hierThis = false;  // m_selfPointer points to "this" function
 
 protected:
     AstNodeVarRef(AstType t, FileLine* fl, const string& name, const VAccess& access)
@@ -2306,13 +2307,14 @@ public:
     void varp(AstVar* varp);
     AstVarScope* varScopep() const { return m_varScopep; }
     void varScopep(AstVarScope* varscp) { m_varScopep = varscp; }
-    string hiernameToProt() const { return m_hiernameToProt; }
-    void hiernameToProt(const string& hn) { m_hiernameToProt = hn; }
-    string hiernameToUnprot() const { return m_hiernameToUnprot; }
-    void hiernameToUnprot(const string& hn) { m_hiernameToUnprot = hn; }
-    string hiernameProtect() const;
     bool hierThis() const { return m_hierThis; }
     void hierThis(bool flag) { m_hierThis = flag; }
+    string selfPointer() const { return m_selfPointer; }
+    void selfPointer(const string& value) { m_selfPointer = value; }
+    string selfPointerProtect(bool useSelfForThis) const;
+    string classPrefix() const { return m_classPrefix; }
+    void classPrefix(const string& value) { m_classPrefix = value; }
+    string classPrefixProtect() const;
     AstNodeModule* classOrPackagep() const { return m_classOrPackagep; }
     void classOrPackagep(AstNodeModule* nodep) { m_classOrPackagep = nodep; }
     // Know no children, and hot function, so skip iterator for speed
@@ -2615,8 +2617,8 @@ class AstNodeCCall VL_NOT_FINAL : public AstNodeStmt {
     // A call of a C++ function, perhaps a AstCFunc or perhaps globally named
     // Functions are not statements, while tasks are. AstNodeStmt needs isStatement() to deal.
     AstCFunc* m_funcp;
-    string m_hiernameToProt;
-    string m_hiernameToUnprot;
+    string m_selfPointer;  // Output code object pointer (e.g.: 'this')
+    string m_classPrefix;  // Output class prefix (i.e.: the part before ::)
     string m_argTypes;
 
 protected:
@@ -2642,11 +2644,12 @@ public:
     virtual bool isPure() const override;
     virtual bool isOutputter() const override { return !isPure(); }
     AstCFunc* funcp() const { return m_funcp; }
-    string hiernameToProt() const { return m_hiernameToProt; }
-    void hiernameToProt(const string& hn) { m_hiernameToProt = hn; }
-    string hiernameToUnprot() const { return m_hiernameToUnprot; }
-    void hiernameToUnprot(const string& hn) { m_hiernameToUnprot = hn; }
-    string hiernameProtect() const;
+    string selfPointer() const { return m_selfPointer; }
+    void selfPointer(const string& value) { m_selfPointer = value; }
+    string selfPointerProtect(bool useSelfForThis) const;
+    string classPrefix() const { return m_classPrefix; }
+    void classPrefix(const string& value) { m_classPrefix = value; }
+    string classPrefixProtect() const;
     void argTypes(const string& str) { m_argTypes = str; }
     string argTypes() const { return m_argTypes; }
     // op1p reserved for AstCMethodCall
diff --git a/src/V3AstNodes.cpp b/src/V3AstNodes.cpp
index 4a6f99d6d..f8e0c1d79 100644
--- a/src/V3AstNodes.cpp
+++ b/src/V3AstNodes.cpp
@@ -55,8 +55,23 @@ void AstNodeVarRef::cloneRelink() {
     if (m_varp && m_varp->clonep()) m_varp = m_varp->clonep();
 }
 
-string AstNodeVarRef::hiernameProtect() const {
-    return hiernameToUnprot() + VIdProtect::protectWordsIf(hiernameToProt(), protect());
+string AstNodeVarRef::selfPointerProtect(bool useSelfForThis) const {
+    const string& sp
+        = useSelfForThis ? VString::replaceWord(selfPointer(), "this", "vlSelf") : selfPointer();
+    return VIdProtect::protectWordsIf(sp, protect());
+}
+
+string AstNodeVarRef::classPrefixProtect() const {
+    return v3Global.opt.modPrefix() + "_" + VIdProtect::protectWordsIf(classPrefix(), protect());
+}
+
+void AstAddrOfCFunc::cloneRelink() {
+    if (m_funcp && m_funcp->clonep()) m_funcp = m_funcp->clonep();
+}
+
+const char* AstAddrOfCFunc::broken() const {
+    BROKEN_RTN(m_funcp && !m_funcp->brokeExists());
+    return nullptr;
 }
 
 int AstNodeSel::bitConst() const {
@@ -108,8 +123,13 @@ const char* AstNodeCCall::broken() const {
     return nullptr;
 }
 bool AstNodeCCall::isPure() const { return funcp()->pure(); }
-string AstNodeCCall::hiernameProtect() const {
-    return hiernameToUnprot() + VIdProtect::protectWordsIf(hiernameToProt(), protect());
+string AstNodeCCall::selfPointerProtect(bool useSelfForThis) const {
+    const string& sp
+        = useSelfForThis ? VString::replaceWord(selfPointer(), "this", "vlSelf") : selfPointer();
+    return VIdProtect::protectWordsIf(sp, protect());
+}
+string AstNodeCCall::classPrefixProtect() const {
+    return v3Global.opt.modPrefix() + "_" + VIdProtect::protectWordsIf(classPrefix(), protect());
 }
 
 void AstNodeCond::numberOperate(V3Number& out, const V3Number& lhs, const V3Number& rhs,
@@ -221,6 +241,21 @@ AstExecGraph::AstExecGraph(FileLine* fileline)
 }
 AstExecGraph::~AstExecGraph() { VL_DO_DANGLING(delete m_depGraphp, m_depGraphp); }
 
+std::vector<const ExecMTask*> AstExecGraph::rootMTasks() {
+    // Build the list of initial mtasks to start
+    std::vector<const ExecMTask*> execMTasks;
+
+    for (const V3GraphVertex* vxp = depGraphp()->verticesBeginp(); vxp;
+         vxp = vxp->verticesNextp()) {
+        const ExecMTask* etp = dynamic_cast<const ExecMTask*>(vxp);
+        if (etp->threadRoot()) execMTasks.push_back(etp);
+    }
+    UASSERT_OBJ(execMTasks.size() <= static_cast<unsigned>(v3Global.opt.threads()), this,
+                "More root mtasks than available threads");
+
+    return execMTasks;
+}
+
 AstNode* AstInsideRange::newAndFromInside(AstNode* exprp, AstNode* lhsp, AstNode* rhsp) {
     AstNode* ap = new AstGte(fileline(), exprp->cloneTree(true), lhsp);
     AstNode* bp = new AstLte(fileline(), exprp->cloneTree(true), rhsp);
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index deba4c885..39b7d74b4 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -2388,8 +2388,7 @@ public:
         if (varScopep()) {
             return (varScopep() == samep->varScopep() && access() == samep->access());
         } else {
-            return (hiernameToProt() == samep->hiernameToProt()
-                    && hiernameToUnprot() == samep->hiernameToUnprot()
+            return (selfPointer() == samep->selfPointer()
                     && varp()->name() == samep->varp()->name() && access() == samep->access());
         }
     }
@@ -2397,9 +2396,8 @@ public:
         if (varScopep()) {
             return (varScopep() == samep->varScopep());
         } else {
-            return (hiernameToProt() == samep->hiernameToProt()
-                    && hiernameToUnprot() == samep->hiernameToUnprot()
-                    && (!hiernameToProt().empty() || !samep->hiernameToProt().empty())
+            return (selfPointer() == samep->selfPointer()
+                    && (!selfPointer().empty() || !samep->selfPointer().empty())
                     && varp()->name() == samep->varp()->name());
         }
     }
@@ -2439,12 +2437,33 @@ public:
     virtual int instrCount() const override { return widthInstrs(); }
     virtual bool same(const AstNode* samep) const override {
         const AstVarXRef* asamep = static_cast<const AstVarXRef*>(samep);
-        return (hiernameToProt() == asamep->hiernameToProt()
-                && hiernameToUnprot() == asamep->hiernameToUnprot() && varp() == asamep->varp()
+        return (selfPointer() == asamep->selfPointer() && varp() == asamep->varp()
                 && name() == asamep->name() && dotted() == asamep->dotted());
     }
 };
 
+class AstAddrOfCFunc final : public AstNodeMath {
+    // Get address of CFunc
+private:
+    AstCFunc* m_funcp;  // Pointer to function itself
+
+public:
+    AstAddrOfCFunc(FileLine* fl, AstCFunc* funcp)
+        : ASTGEN_SUPER_AddrOfCFunc(fl)
+        , m_funcp{funcp} {
+        dtypep(findCHandleDType());
+    }
+
+public:
+    ASTNODE_NODE_FUNCS(AddrOfCFunc)
+    virtual void cloneRelink() override;
+    virtual const char* broken() const override;
+    virtual string emitVerilog() override { V3ERROR_NA_RETURN(""); }
+    virtual string emitC() override { V3ERROR_NA_RETURN(""); }
+    virtual bool cleanOut() const override { return true; }
+    AstCFunc* funcp() const { return m_funcp; }
+};
+
 class AstPin final : public AstNode {
     // A pin on a cell
 private:
@@ -8717,7 +8736,6 @@ private:
     VBoolOrUnknown m_isConst;  // Function is declared const (*this not changed)
     VBoolOrUnknown m_isStatic;  // Function is declared static (no this)
     bool m_dontCombine : 1;  // V3Combine shouldn't compare this func tree, it's special
-    bool m_skipDecl : 1;  // Don't declare it
     bool m_declPrivate : 1;  // Declare it private
     bool m_formCallTree : 1;  // Make a global function to call entire tree of functions
     bool m_slow : 1;  // Slow routine, called once or just at init time
@@ -8725,9 +8743,10 @@ private:
     bool m_isConstructor : 1;  // Is C class constructor
     bool m_isDestructor : 1;  // Is C class destructor
     bool m_isMethod : 1;  // Is inside a class definition
+    bool m_isLoose : 1;  // Semantically this is a method, but is implemented as a function
+                         // with an explicitly passed 'self' pointer as the first argument
     bool m_isInline : 1;  // Inline function
     bool m_isVirtual : 1;  // Virtual function
-    bool m_symProlog : 1;  // Setup symbol table for later instructions
     bool m_entryPoint : 1;  // User may call into this top level function
     bool m_pure : 1;  // Pure function
     bool m_dpiExport : 1;  // From dpi export
@@ -8744,7 +8763,6 @@ public:
         m_name = name;
         m_rtnType = rtnType;
         m_dontCombine = false;
-        m_skipDecl = false;
         m_declPrivate = false;
         m_formCallTree = false;
         m_slow = false;
@@ -8752,9 +8770,9 @@ public:
         m_isConstructor = false;
         m_isDestructor = false;
         m_isMethod = true;
+        m_isLoose = false;
         m_isInline = false;
         m_isVirtual = false;
-        m_symProlog = false;
         m_entryPoint = false;
         m_pure = false;
         m_dpiExport = false;
@@ -8774,6 +8792,7 @@ public:
         const AstCFunc* asamep = static_cast<const AstCFunc*>(samep);
         return ((funcType() == asamep->funcType()) && (rtnTypeVoid() == asamep->rtnTypeVoid())
                 && (argTypes() == asamep->argTypes()) && (ctorInits() == asamep->ctorInits())
+                && isLoose() == asamep->isLoose()
                 && (!(dpiImport() || dpiExport()) || name() == asamep->name()));
     }
     //
@@ -8792,9 +8811,7 @@ public:
     string rtnTypeVoid() const { return ((m_rtnType == "") ? "void" : m_rtnType); }
     bool dontCombine() const { return m_dontCombine || funcType() != AstCFuncType::FT_NORMAL; }
     void dontCombine(bool flag) { m_dontCombine = flag; }
-    bool dontInline() const { return dontCombine() || slow() || skipDecl() || funcPublic(); }
-    bool skipDecl() const { return m_skipDecl; }
-    void skipDecl(bool flag) { m_skipDecl = flag; }
+    bool dontInline() const { return dontCombine() || slow() || funcPublic(); }
     bool declPrivate() const { return m_declPrivate; }
     void declPrivate(bool flag) { m_declPrivate = flag; }
     bool formCallTree() const { return m_formCallTree; }
@@ -8817,12 +8834,13 @@ public:
     void isDestructor(bool flag) { m_isDestructor = flag; }
     bool isMethod() const { return m_isMethod; }
     void isMethod(bool flag) { m_isMethod = flag; }
+    bool isLoose() const { return m_isLoose; }
+    void isLoose(bool flag) { m_isLoose = flag; }
+    bool isProperMethod() const { return isMethod() && !isLoose(); }
     bool isInline() const { return m_isInline; }
     void isInline(bool flag) { m_isInline = flag; }
     bool isVirtual() const { return m_isVirtual; }
     void isVirtual(bool flag) { m_isVirtual = flag; }
-    bool symProlog() const { return m_symProlog; }
-    void symProlog(bool flag) { m_symProlog = flag; }
     bool entryPoint() const { return m_entryPoint; }
     void entryPoint(bool flag) { m_entryPoint = flag; }
     bool pure() const { return m_pure; }
@@ -9039,6 +9057,7 @@ public:
     const V3Graph* depGraphp() const { return m_depGraphp; }
     V3Graph* mutableDepGraphp() { return m_depGraphp; }
     void addMTaskBody(AstMTaskBody* bodyp) { addOp1p(bodyp); }
+    std::vector<const ExecMTask*> rootMTasks();
 };
 
 class AstSplitPlaceholder final : public AstNode {
diff --git a/src/V3CCtors.cpp b/src/V3CCtors.cpp
index b8b989aeb..ca8b6d31d 100644
--- a/src/V3CCtors.cpp
+++ b/src/V3CCtors.cpp
@@ -61,23 +61,21 @@ private:
         const int funcNum = m_newFunctions.size();
         const string funcName = m_basename + "_" + cvtToStr(funcNum);
         AstCFunc* const funcp = new AstCFunc(m_modp->fileline(), funcName, nullptr, "void");
-        funcp->isStatic(!m_type.isClass());  // Class constructors are non static
+        funcp->isStatic(false);
+        funcp->isLoose(!m_type.isClass());
         funcp->declPrivate(true);
         funcp->slow(!m_type.isClass());  // Only classes construct on fast path
         string preventUnusedStmt;
         if (m_type.isClass()) {
             funcp->argTypes(EmitCBaseVisitor::symClassVar());
-            preventUnusedStmt = "if (false && vlSymsp) {}";
+            preventUnusedStmt = "if (false && vlSymsp) {}  // Prevent unused\n";
         } else if (m_type.isCoverage()) {
-            funcp->argTypes(EmitCBaseVisitor::prefixNameProtect(m_modp) + "* self, "
-                            + EmitCBaseVisitor::symClassVar() + ", bool first");
-            preventUnusedStmt = "if (false && self && vlSymsp && first) {}";
-        } else {  // Module
-            funcp->argTypes(EmitCBaseVisitor::prefixNameProtect(m_modp) + "* self");
-            preventUnusedStmt = "if (false && self) {}";
+            funcp->argTypes("bool first");
+            preventUnusedStmt = "if (false && first) {}  // Prevent unused\n";
+        }
+        if (!preventUnusedStmt.empty()) {
+            funcp->addStmtsp(new AstCStmt(m_modp->fileline(), preventUnusedStmt));
         }
-        preventUnusedStmt += "  // Prevent unused\n";
-        funcp->addStmtsp(new AstCStmt(m_modp->fileline(), preventUnusedStmt));
         m_modp->addStmtp(funcp);
         m_numStmts = 0;
         return funcp;
@@ -113,10 +111,9 @@ public:
                 AstCCall* const callp = new AstCCall(m_modp->fileline(), funcp);
                 if (m_type.isClass()) {
                     callp->argTypes("vlSymsp");
-                } else if (m_type.isCoverage()) {
-                    callp->argTypes("self, vlSymsp, first");
-                } else {  // Module
-                    callp->argTypes("self");
+                } else {
+                    if (m_type.isCoverage()) callp->argTypes("first");
+                    callp->selfPointer("this");
                 }
                 rootFuncp->addStmtsp(callp);
             }
@@ -134,6 +131,7 @@ void V3CCtors::evalAsserts() {
     AstCFunc* funcp = new AstCFunc(modp->fileline(), "_eval_debug_assertions", nullptr, "void");
     funcp->declPrivate(true);
     funcp->isStatic(false);
+    funcp->isLoose(true);
     funcp->slow(false);
     funcp->ifdef("VL_DEBUG");
     modp->addStmtp(funcp);
@@ -145,7 +143,11 @@ void V3CCtors::evalAsserts() {
                     int lastWordWidth = varp->width() % storedWidth;
                     if (lastWordWidth != 0) {
                         // if (signal & CONST(upper_non_clean_mask)) { fail; }
-                        AstNode* newp = new AstVarRef(varp->fileline(), varp, VAccess::READ);
+                        AstVarRef* const vrefp
+                            = new AstVarRef(varp->fileline(), varp, VAccess::READ);
+                        vrefp->selfPointer(v3Global.opt.relativeCFuncs() ? "this"
+                                                                         : "vlSymsp->TOPp");
+                        AstNode* newp = vrefp;
                         if (varp->isWide()) {
                             newp = new AstWordSel(
                                 varp->fileline(), newp,
diff --git a/src/V3Changed.cpp b/src/V3Changed.cpp
index 6bd904099..79e2ad14d 100644
--- a/src/V3Changed.cpp
+++ b/src/V3Changed.cpp
@@ -61,14 +61,13 @@ public:
             m_chgFuncp
                 = new AstCFunc(m_scopetopp->fileline(), "_change_request_" + cvtToStr(++m_funcNum),
                                m_scopetopp, "QData");
-            m_chgFuncp->argTypes(EmitCBaseVisitor::symClassVar());
-            m_chgFuncp->symProlog(true);
+            m_chgFuncp->isStatic(false);
+            m_chgFuncp->isLoose(true);
             m_chgFuncp->declPrivate(true);
             m_scopetopp->addActivep(m_chgFuncp);
 
             // Add a top call to it
             AstCCall* callp = new AstCCall(m_scopetopp->fileline(), m_chgFuncp);
-            callp->argTypes("vlSymsp");
 
             if (!m_tlChgFuncp->stmtsp()) {
                 m_tlChgFuncp->addStmtsp(new AstCReturn(m_scopetopp->fileline(), callp));
@@ -251,8 +250,8 @@ private:
         // Create a wrapper change detection function that calls each change detection function
         m_statep->m_tlChgFuncp
             = new AstCFunc(nodep->fileline(), "_change_request", scopep, "QData");
-        m_statep->m_tlChgFuncp->argTypes(EmitCBaseVisitor::symClassVar());
-        m_statep->m_tlChgFuncp->symProlog(true);
+        m_statep->m_tlChgFuncp->isStatic(false);
+        m_statep->m_tlChgFuncp->isLoose(true);
         m_statep->m_tlChgFuncp->declPrivate(true);
         m_statep->m_scopetopp->addActivep(m_statep->m_tlChgFuncp);
         // Each change detection function needs at least one AstChangeDet
diff --git a/src/V3Clock.cpp b/src/V3Clock.cpp
index 05620b081..84a1c3b7d 100644
--- a/src/V3Clock.cpp
+++ b/src/V3Clock.cpp
@@ -164,6 +164,18 @@ private:
         m_lastSenp = nullptr;
         m_lastIfp = nullptr;
     }
+    AstCFunc* makeTopFunction(const string& name, bool slow = false) {
+        AstCFunc* const funcp = new AstCFunc{m_topScopep->fileline(), name, m_topScopep->scopep()};
+        funcp->dontCombine(true);
+        funcp->isStatic(false);
+        funcp->isLoose(true);
+        funcp->entryPoint(true);
+        funcp->slow(slow);
+        funcp->isConst(false);
+        funcp->declPrivate(true);
+        m_topScopep->scopep()->addActivep(funcp);
+        return funcp;
+    }
     void splitCheck(AstCFunc* ofuncp) {
         if (!v3Global.opt.outputSplitCFuncs() || !ofuncp->stmtsp()) return;
         if (EmitCBaseCounterVisitor(ofuncp->stmtsp()).count() < v3Global.opt.outputSplitCFuncs())
@@ -184,15 +196,13 @@ private:
                 // Make a new function
                 funcp = new AstCFunc{ofuncp->fileline(), ofuncp->name() + cvtToStr(++funcnum),
                                      m_topScopep->scopep()};
-                funcp->argTypes(EmitCBaseVisitor::symClassVar());
                 funcp->dontCombine(true);
-                funcp->symProlog(true);
-                funcp->isStatic(true);
+                funcp->isStatic(false);
+                funcp->isLoose(true);
                 funcp->slow(ofuncp->slow());
                 m_topScopep->scopep()->addActivep(funcp);
                 //
                 AstCCall* callp = new AstCCall{funcp->fileline(), funcp};
-                callp->argTypes("vlSymsp");
                 ofuncp->addStmtsp(callp);
                 func_stmts = 0;
             }
@@ -212,55 +222,10 @@ private:
         // VV*****  We reset all user1p()
         AstNode::user1ClearTree();
         // Make top functions
-        {
-            AstCFunc* funcp = new AstCFunc{nodep->fileline(), "_eval", m_topScopep->scopep()};
-            funcp->argTypes(EmitCBaseVisitor::symClassVar());
-            funcp->dontCombine(true);
-            funcp->symProlog(true);
-            funcp->isStatic(true);
-            funcp->entryPoint(true);
-            m_topScopep->scopep()->addActivep(funcp);
-            m_evalFuncp = funcp;
-        }
-        {
-            AstCFunc* funcp
-                = new AstCFunc{nodep->fileline(), "_eval_initial", m_topScopep->scopep()};
-            funcp->argTypes(EmitCBaseVisitor::symClassVar());
-            funcp->dontCombine(true);
-            funcp->slow(true);
-            funcp->symProlog(true);
-            funcp->isStatic(true);
-            funcp->entryPoint(true);
-            m_topScopep->scopep()->addActivep(funcp);
-            m_initFuncp = funcp;
-        }
-        {
-            AstCFunc* funcp = new AstCFunc{nodep->fileline(), "final", m_topScopep->scopep()};
-            funcp->skipDecl(true);
-            funcp->dontCombine(true);
-            funcp->slow(true);
-            funcp->isStatic(false);
-            funcp->entryPoint(true);
-            funcp->protect(false);
-            funcp->addInitsp(new AstCStmt(nodep->fileline(), EmitCBaseVisitor::symClassVar()
-                                                                 + " = this->__VlSymsp;\n"));
-            funcp->addInitsp(
-                new AstCStmt(nodep->fileline(), EmitCBaseVisitor::symTopAssign() + "\n"));
-            m_topScopep->scopep()->addActivep(funcp);
-            m_finalFuncp = funcp;
-        }
-        {
-            AstCFunc* funcp
-                = new AstCFunc{nodep->fileline(), "_eval_settle", m_topScopep->scopep()};
-            funcp->argTypes(EmitCBaseVisitor::symClassVar());
-            funcp->dontCombine(true);
-            funcp->slow(true);
-            funcp->isStatic(true);
-            funcp->symProlog(true);
-            funcp->entryPoint(true);
-            m_topScopep->scopep()->addActivep(funcp);
-            m_settleFuncp = funcp;
-        }
+        m_evalFuncp = makeTopFunction("_eval");
+        m_initFuncp = makeTopFunction("_eval_initial", /* slow: */ true);
+        m_settleFuncp = makeTopFunction("_eval_settle", /* slow: */ true);
+        m_finalFuncp = makeTopFunction("_final", /* slow: */ true);
         // Process the activates
         iterateChildren(nodep);
         UINFO(4, " TOPSCOPE iter done " << nodep << endl);
@@ -324,7 +289,6 @@ private:
         if (nodep->formCallTree()) {
             UINFO(4, "    formCallTree " << nodep << endl);
             AstCCall* callp = new AstCCall(nodep->fileline(), nodep);
-            callp->argTypes("vlSymsp");
             m_finalFuncp->addStmtsp(callp);
         }
     }
diff --git a/src/V3Combine.cpp b/src/V3Combine.cpp
index b859b455c..ee1284598 100644
--- a/src/V3Combine.cpp
+++ b/src/V3Combine.cpp
@@ -72,8 +72,8 @@ public:
                 AstNode* const argsp
                     = oldp->argsp() ? oldp->argsp()->unlinkFrBackWithNext() : nullptr;
                 AstCCall* const newp = new AstCCall(oldp->fileline(), newfuncp, argsp);
-                newp->hiernameToProt(oldp->hiernameToProt());
-                newp->hiernameToUnprot(oldp->hiernameToUnprot());
+                newp->selfPointer(oldp->selfPointer());
+                newp->classPrefix(oldp->classPrefix());
                 newp->argTypes(oldp->argTypes());
                 addCall(newp);  // Fix the table, in case the newfuncp itself gets replaced
                 oldp->replaceWith(newp);
@@ -86,14 +86,23 @@ public:
         }
     }
     // METHODS
-    void addCall(AstCCall* nodep) {
-        if (nodep->funcp()->dontCombine()) return;
-        m_callMmap.emplace(nodep->funcp(), nodep);
-    }
+    void addCall(AstCCall* nodep) { m_callMmap.emplace(nodep->funcp(), nodep); }
 
 private:
     // VISITORS
-    virtual void visit(AstCCall* nodep) override { addCall(nodep); }
+    virtual void visit(AstCCall* nodep) override {
+        if (nodep->funcp()->dontCombine()) return;
+        addCall(nodep);
+    }
+    // LCOV_EXCL_START
+    virtual void visit(AstAddrOfCFunc* nodep) override {
+        // We cannot yet handle references via AstAddrOfCFunc, but currently those are
+        // only used in tracing functions, which are not combined. Blow up in case this changes.
+        if (nodep->funcp()->dontCombine()) return;
+        nodep->v3fatalSrc(
+            "Don't know how to combine functions that are referenced via AstAddrOfCFunc");
+    }
+    // LCOV_EXCL_END
     // Speed things up
     virtual void visit(AstNodeAssign*) override {}
     virtual void visit(AstNodeMath*) override {}
diff --git a/src/V3DepthBlock.cpp b/src/V3DepthBlock.cpp
index 36924db42..5707fccd4 100644
--- a/src/V3DepthBlock.cpp
+++ b/src/V3DepthBlock.cpp
@@ -51,14 +51,19 @@ private:
         // Create function
         string name = m_cfuncp->name() + "__deep" + cvtToStr(++m_deepNum);
         AstCFunc* funcp = new AstCFunc(nodep->fileline(), name, nullptr);
-        funcp->argTypes(EmitCBaseVisitor::symClassVar());
-        funcp->symProlog(true);
         funcp->slow(m_cfuncp->slow());
+        funcp->isStatic(m_cfuncp->isStatic());
+        funcp->isLoose(m_cfuncp->isLoose());
         funcp->addStmtsp(nodep);
         m_modp->addStmtp(funcp);
         // Call it at the point where the body was removed from
         AstCCall* callp = new AstCCall(nodep->fileline(), funcp);
-        callp->argTypes("vlSymsp");
+        if (VN_IS(m_modp, Class)) {
+            funcp->argTypes(EmitCBaseVisitor::symClassVar());
+            callp->argTypes("vlSymsp");
+        } else if (funcp->isStatic().falseUnknown()) {
+            callp->selfPointer("this");
+        }
         UINFO(6, "      New " << callp << endl);
         //
         relinkHandle.relink(callp);
diff --git a/src/V3Descope.cpp b/src/V3Descope.cpp
index 3e40fa3ee..8d94ef243 100644
--- a/src/V3Descope.cpp
+++ b/src/V3Descope.cpp
@@ -56,7 +56,8 @@ private:
     VL_DEBUG_FUNC;  // Declare debug()
 
     static bool modIsSingleton(AstNodeModule* modp) {
-        // True iff there's exactly one instance of this module in the design.
+        // True iff there's exactly one instance of this module in the design (including top).
+        if (modp->isTop()) return true;
         int instances = 0;
         for (AstNode* stmtp = modp->stmtsp(); stmtp; stmtp = stmtp->nextp()) {
             if (VN_IS(stmtp, Scope)) {
@@ -66,85 +67,68 @@ private:
         return (instances == 1);
     }
 
-    // Construct the best prefix to reference an object in 'scopep'
-    // from a CFunc in 'm_scopep'. Result may be relative
-    // ("this->[...]") or absolute ("vlTOPp->[...]").
+    // Construct the best self pointer to reference an object in 'scopep'  from a CFunc in
+    // 'm_scopep'. Result may be relative ("this->[...]") or absolute ("vlSyms->[...]").
     //
-    // Using relative references allows V3Combine'ing
-    // code across multiple instances of the same module.
-    //
-    // Sets 'hierThisr' true if the object is local to this scope
-    // (and could be made into a function-local later in V3Localize),
-    // false if the object is in another scope.
-    string descopedName(bool& hierThisr, string& hierUnprot, const AstScope* scopep,
-                        const AstVar* varp) {
+    // Using relative references allows V3Combine'ing code across multiple instances of the same
+    // module.
+    string descopedSelfPointer(const AstScope* scopep) {
         UASSERT(scopep, "Var/Func not scoped");
-        hierThisr = (scopep == m_scopep);
 
         // It's possible to disable relative references. This is a concession
         // to older compilers (gcc < 4.5.x) that don't understand __restrict__
         // well and emit extra ld/st to guard against pointer aliasing
-        // when this-> and vlTOPp-> are mixed in the same function.
-        //
-        // "vlTOPp" is declared "restrict" so better compilers understand
-        // that it won't alias with "this".
+        // when this-> and vlSyms-> are mixed in the same function.
         bool relativeRefOk = v3Global.opt.relativeCFuncs();
         //
         // Static functions can't use this
         if (!m_allowThis) relativeRefOk = false;
         //
-        // Use absolute refs in top-scoped routines, keep them static.
-        // The DPI callback registration depends on representing top-level
-        // static routines as plain function pointers. That breaks if those
-        // become true OO routines.
-        //
-        // V3Combine wouldn't likely be able to combine top-level
-        // routines anyway, so there's no harm in keeping these static.
-        UASSERT_OBJ(m_modp, scopep, "Scope not under module");
-        if (m_modp->isTop()) relativeRefOk = false;
-        //
-        // Use absolute refs if this scope is the only instance of the module.
-        // Saves a bit of overhead on passing the 'this' pointer, and there's no
-        // need to be nice to V3Combine when we have only a single instance.
-        // The risk that this prevents combining identical logic from differently-
-        // named but identical modules seems low.
-        if (m_modSingleton) relativeRefOk = false;
-        //
         // Class methods need relative
         if (m_modp && VN_IS(m_modp, Class)) relativeRefOk = true;
 
-        if (varp && varp->isFuncLocal()) {
-            hierThisr = true;
-            return "";  // Relative to function, not in this
-        } else if (relativeRefOk && scopep == m_scopep) {
+        UINFO(8, "      Descope ref under " << m_scopep << endl);
+        UINFO(8, "              ref to    " << scopep << endl);
+        UINFO(8, "             aboveScope " << scopep->aboveScopep() << endl);
+
+        if (relativeRefOk && scopep == m_scopep) {
             m_needThis = true;
-            return "this->";
+            return "this";
         } else if (VN_IS(scopep->modp(), Class)) {
-            hierUnprot = v3Global.opt.modPrefix() + "_";  // Prefix before protected part
-            return scopep->modp()->name() + "::";
-        } else if (relativeRefOk && scopep->aboveScopep() && scopep->aboveScopep() == m_scopep) {
-            // Reference to scope of instance directly under this module, can just "cell->"
+            return "";
+        } else if (!m_modSingleton && relativeRefOk && scopep->aboveScopep() == m_scopep
+                   && VN_IS(scopep->modp(), Module)) {
+            // Reference to scope of instance directly under this module, can just "this->cell",
+            // which can potentially be V3Combined, but note this requires one extra pointer
+            // dereference which is slower, so we only use it if the source scope is not a
+            // singleton.
             string name = scopep->name();
             string::size_type pos;
             if ((pos = name.rfind('.')) != string::npos) name.erase(0, pos + 1);
             m_needThis = true;
-            return name + "->";
+            return "this->" + name;
         } else {
-            // Reference to something elsewhere, or relative references
-            // are disabled. Use global variable
-            UINFO(8, "      Descope " << scopep << endl);
-            UINFO(8, "           to " << scopep->name() << endl);
-            UINFO(8, "        under " << m_scopep->name() << endl);
-            if (!scopep->aboveScopep()) {  // Top
-                // We could also return "vlSymsp->TOPp->" here, but GCC would
-                // suspect aliases.
-                return "vlTOPp->";
+            // Reference to something elsewhere, or relative references are disabled. Use global
+            // variable
+            if (scopep->isTop()) {  // Top
+                return "vlSymsp->TOPp";
             } else {
-                return scopep->nameVlSym() + ".";
+                return "(&" + scopep->nameVlSym() + ")";
             }
         }
     }
 
+    // Construct the class prefix (as in, the part before the :: scope resolution operator) when
+    // referencing an object in 'scopep' from a CFunc in 'm_scopep'.
+    string descopedClassPrefix(const AstScope* scopep) {
+        UASSERT(scopep, "Var/Func not scoped");
+        if (VN_IS(scopep->modp(), Class) && scopep != m_scopep) {
+            return scopep->modp()->name();
+        } else {
+            return "";
+        }
+    }
+
     void makePublicFuncWrappers() {
         // We recorded all public functions in m_modFuncs.
         // If for any given name only one function exists, we can use that function directly.
@@ -164,11 +148,6 @@ private:
                 if (newfuncp->finalsp()) newfuncp->finalsp()->unlinkFrBackWithNext()->deleteTree();
                 newfuncp->name(name);
                 newfuncp->isStatic(false);
-                newfuncp->addInitsp(
-                    new AstCStmt(newfuncp->fileline(),
-                                 EmitCBaseVisitor::symClassVar() + " = this->__VlSymsp;\n"));
-                newfuncp->addInitsp(
-                    new AstCStmt(newfuncp->fileline(), EmitCBaseVisitor::symTopAssign() + "\n"));
                 topFuncp->addNextHere(newfuncp);
                 // In the body, call each function if it matches the given scope
                 for (FuncMmap::iterator eachIt = it;
@@ -255,13 +234,15 @@ private:
         // Convert the hierch name
         UINFO(9, "  ref-in " << nodep << endl);
         UASSERT_OBJ(m_scopep, nodep, "Node not under scope");
-        bool hierThis;
-        string hierUnprot;
-        nodep->hiernameToProt(descopedName(hierThis /*ref*/, hierUnprot /*ref*/,
-                                           nodep->varScopep()->scopep(),
-                                           nodep->varScopep()->varp()));
-        nodep->hiernameToUnprot(hierUnprot);
-        nodep->hierThis(hierThis);
+        const AstVar* const varp = nodep->varScopep()->varp();
+        const AstScope* const scopep = nodep->varScopep()->scopep();
+        if (varp->isFuncLocal()) {
+            nodep->hierThis(true);
+        } else {
+            nodep->hierThis(scopep == m_scopep);
+            nodep->selfPointer(descopedSelfPointer(scopep));
+            nodep->classPrefix(descopedClassPrefix(scopep));
+        }
         nodep->varScopep(nullptr);
         UINFO(9, "  refout " << nodep << endl);
     }
@@ -270,12 +251,9 @@ private:
         iterateChildren(nodep);
         // Convert the hierch name
         UASSERT_OBJ(m_scopep, nodep, "Node not under scope");
-        UASSERT_OBJ(nodep->funcp()->scopep(), nodep, "CFunc not under scope");
-        bool hierThis;
-        string hierUnprot;
-        nodep->hiernameToProt(
-            descopedName(hierThis /*ref*/, hierUnprot /*ref*/, nodep->funcp()->scopep(), nullptr));
-        nodep->hiernameToUnprot(hierUnprot);
+        const AstScope* const scopep = nodep->funcp()->scopep();
+        nodep->selfPointer(descopedSelfPointer(scopep));
+        nodep->classPrefix(descopedClassPrefix(scopep));
         // Can't do this, as we may have more calls later
         // nodep->funcp()->scopep(nullptr);
     }
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index d71fdd96b..7f5b11006 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -50,6 +50,11 @@ private:
     int m_labelNum;  // Next label number
     int m_splitSize;  // # of cfunc nodes placed into output file
     int m_splitFilenum;  // File number being created, 0 = primary
+    bool m_inUC = false;  // Inside an AstUCStmt or AstUCMath
+
+protected:
+    bool m_useSelfForThis = false;  // Replace "this" with "vlSelf"
+    AstNodeModule* m_modp = nullptr;  // Current module being emitted
 
 public:
     // METHODS
@@ -65,8 +70,7 @@ public:
     void splitSizeInc(int count) { m_splitSize += count; }
     void splitSizeInc(AstNode* nodep) { splitSizeInc(EmitCBaseCounterVisitor(nodep).count()); }
     bool splitNeeded() const {
-        return (splitSize() && v3Global.opt.outputSplit()
-                && v3Global.opt.outputSplit() < splitSize());
+        return v3Global.opt.outputSplit() && splitSize() >= v3Global.opt.outputSplit();
     }
 
     // METHODS
@@ -226,60 +230,41 @@ public:
             return lhsp->name() < rhsp->name();
         }
     };
-    void emitIntFuncDecls(AstNodeModule* modp, bool methodFuncs) {
+    void emitIntFuncDecls(AstNodeModule* modp, bool inClassBody) {
         std::vector<const AstCFunc*> funcsp;
 
         for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
             if (const AstCFunc* funcp = VN_CAST(nodep, CFunc)) {
-                if (!funcp->skipDecl() && funcp->isMethod() == methodFuncs
-                    && !funcp->dpiImport()) {  // DPI is prototyped in __Dpi.h
-                    funcsp.push_back(funcp);
-                }
+                if (funcp->dpiImport())  // DPI import functions are declared in __Dpi.h
+                    continue;
+                if (funcp->isMethod() != inClassBody)  // Only methods go inside class
+                    continue;
+                if (funcp->isMethod() && funcp->isLoose())  // Loose methods are declared lazily
+                    continue;
+                funcsp.push_back(funcp);
             }
         }
 
         stable_sort(funcsp.begin(), funcsp.end(), CmpName());
 
         for (const AstCFunc* funcp : funcsp) {
-            ofp()->putsPrivate(funcp->declPrivate());
-            if (!funcp->ifdef().empty()) puts("#ifdef " + funcp->ifdef() + "\n");
-            if (funcp->isStatic().trueUnknown()) puts("static ");
-            if (funcp->isVirtual()) puts("virtual ");
-            if (!funcp->isConstructor() && !funcp->isDestructor()) {
-                puts(funcp->rtnTypeVoid());
-                puts(" ");
-            }
-            puts(funcNameProtect(funcp, modp));
-            puts("(" + cFuncArgs(funcp) + ")");
-            if (funcp->isConst().trueKnown()) puts(" const");
-            if (funcp->slow()) puts(" VL_ATTR_COLD");
-            puts(";\n");
-            if (!funcp->ifdef().empty()) puts("#endif  // " + funcp->ifdef() + "\n");
-        }
-
-        if (methodFuncs && modp->isTop() && v3Global.opt.mtasks()) {
-            // Emit the mtask func prototypes.
-            AstExecGraph* execGraphp = v3Global.rootp()->execGraphp();
-            UASSERT_OBJ(execGraphp, v3Global.rootp(), "Root should have an execGraphp");
-            const V3Graph* depGraphp = execGraphp->depGraphp();
-            for (const V3GraphVertex* vxp = depGraphp->verticesBeginp(); vxp;
-                 vxp = vxp->verticesNextp()) {
-                const ExecMTask* mtp = dynamic_cast<const ExecMTask*>(vxp);
-                if (mtp->threadRoot()) {
-                    // Emit function declaration for this mtask
-                    ofp()->putsPrivate(true);
-                    puts("static void ");
-                    puts(protect(mtp->cFuncName()));
-                    puts("(bool even_cycle, void* symtab);\n");
-                }
-            }
-            // No AstCFunc for this one, as it's synthetic. Just write it:
-            puts("static void __Vmtask__final(bool even_cycle, void* symtab);\n");
+            if (inClassBody) ofp()->putsPrivate(funcp->declPrivate());
+            emitCFuncDecl(funcp, modp);
         }
     }
     void ccallIterateArgs(AstNodeCCall* nodep) {
-        puts(nodep->argTypes());
-        bool comma = (nodep->argTypes() != "");
+        bool comma = false;
+        if (nodep->funcp()->isLoose() && nodep->funcp()->isStatic().falseUnknown()) {
+            UASSERT_OBJ(!nodep->selfPointer().empty(), nodep,
+                        "Call to loose method without self pointer");
+            puts(nodep->selfPointerProtect(m_useSelfForThis));
+            comma = true;
+        }
+        if (!nodep->argTypes().empty()) {
+            if (comma) puts(", ");
+            puts(nodep->argTypes());
+            comma = true;
+        }
         for (AstNode* subnodep = nodep->argsp(); subnodep; subnodep = subnodep->nextp()) {
             if (comma) puts(", ");
             iterate(subnodep);
@@ -287,6 +272,18 @@ public:
         }
     }
 
+    void emitDereference(const string& pointer) {
+        if (pointer[0] == '(' && pointer[1] == '&') {
+            // remove "address of" followed by immediate dereference
+            // Note: this relies on only the form '(&OBJECT)' being used by Verilator
+            puts(pointer.substr(2, pointer.length() - 3));
+            puts(".");
+        } else {
+            puts(pointer);
+            puts("->");
+        }
+    }
+
     // VISITORS
     virtual void visit(AstNodeAssign* nodep) override {
         bool paren = true;
@@ -384,14 +381,32 @@ public:
         puts(")");
     }
     virtual void visit(AstNodeCCall* nodep) override {
+        const AstCFunc* const funcp = nodep->funcp();
         if (AstCMethodCall* ccallp = VN_CAST(nodep, CMethodCall)) {
+            UASSERT_OBJ(!funcp->isLoose(), nodep, "Loose method called via AstCMethodCall");
             // make this a Ast type for future opt
             iterate(ccallp->fromp());
             putbs("->");
+            puts(funcp->nameProtect());
+        } else if (funcp->isProperMethod() && funcp->isStatic().trueUnknown()) {
+            // Call static method via the containing class
+            AstNodeModule* modp = VN_CAST(funcp->user4p(), NodeModule);
+            puts(prefixNameProtect(modp) + "::");
+            puts(funcp->nameProtect());
+        } else if (!nodep->classPrefix().empty()) {
+            // Prefix explicitly given
+            puts(nodep->classPrefixProtect() + "::");
+            puts(funcp->nameProtect());
+        } else if (funcp->isLoose()) {
+            // Calling loose method
+            puts(funcNameProtect(funcp));
         } else {
-            puts(nodep->hiernameProtect());
+            // Calling regular method/function
+            if (!nodep->selfPointer().empty()) {
+                emitDereference(nodep->selfPointerProtect(m_useSelfForThis));
+            }
+            puts(funcp->nameProtect());
         }
-        puts(nodep->funcp()->nameProtect());
         puts("(");
         ccallIterateArgs(nodep);
         if (VN_IS(nodep->backp(), NodeMath) || VN_IS(nodep->backp(), CReturn)) {
@@ -459,7 +474,7 @@ public:
         iterateChildren(nodep);
     }
     virtual void visit(AstCoverDecl* nodep) override {
-        puts("self->__vlCoverInsert(");  // As Declared in emitCoverageDecl
+        puts("vlSelf->__vlCoverInsert(");  // As Declared in emitCoverageDecl
         puts("&(vlSymsp->__Vcoverage[");
         puts(cvtToStr(nodep->dataDeclThisp()->binNum()));
         puts("])");
@@ -886,10 +901,13 @@ public:
         puts(", vlSymsp->_vm_contextp__);\n");
     }
     virtual void visit(AstNodeSimpleText* nodep) override {
+        const string text = m_inUC && m_useSelfForThis
+                                ? VString::replaceWord(nodep->text(), "this", "vlSelf")
+                                : nodep->text();
         if (nodep->tracking() || m_trackText) {
-            puts(nodep->text());
+            puts(text);
         } else {
-            ofp()->putsNoTracking(nodep->text());
+            ofp()->putsNoTracking(text);
         }
     }
     virtual void visit(AstTextBlock* nodep) override {
@@ -908,11 +926,15 @@ public:
         iterateAndNextNull(nodep->bodysp());
     }
     virtual void visit(AstUCStmt* nodep) override {
+        VL_RESTORER(m_inUC);
+        m_inUC = true;
         putsDecoration(ifNoProtect("// $c statement at " + nodep->fileline()->ascii() + "\n"));
         iterateAndNextNull(nodep->bodysp());
         puts("\n");
     }
     virtual void visit(AstUCFunc* nodep) override {
+        VL_RESTORER(m_inUC);
+        m_inUC = true;
         puts("\n");
         putsDecoration(ifNoProtect("// $c function at " + nodep->fileline()->ascii() + "\n"));
         iterateAndNextNull(nodep->bodysp());
@@ -1108,9 +1130,24 @@ public:
     virtual void visit(AstInitItem* nodep) override { iterateChildren(nodep); }
     // Terminals
     virtual void visit(AstVarRef* nodep) override {
-        puts(nodep->hiernameProtect());
+        const AstVar* const varp = nodep->varp();
+        if (varp->isStatic()) {
+            // Access static variable via the containing class
+            puts(prefixNameProtect(varp->user4p()) + "::");
+        } else if (!nodep->classPrefix().empty()) {
+            puts(nodep->classPrefixProtect() + "::");
+        } else if (!nodep->selfPointer().empty()) {
+            emitDereference(nodep->selfPointerProtect(m_useSelfForThis));
+        }
         puts(nodep->varp()->nameProtect());
     }
+    virtual void visit(AstAddrOfCFunc* nodep) override {
+        // Note: Can be thought to handle more, but this is all that is needed right now
+        AstCFunc* const funcp = nodep->funcp();
+        UASSERT_OBJ(funcp->isLoose(), nodep, "Cannot take address of non-loose method");
+        puts("&");
+        puts(funcNameProtect(funcp));
+    }
     void emitCvtPackStr(AstNode* nodep) {
         if (const AstConst* constp = VN_CAST(nodep, Const)) {
             putbs("std::string(");
@@ -1172,7 +1209,9 @@ public:
                 if (!assigntop) {
                     puts(assignString);
                 } else if (VN_IS(assigntop, VarRef)) {
-                    puts(assigntop->hiernameProtect());
+                    if (!assigntop->selfPointer().empty()) {
+                        emitDereference(assigntop->selfPointerProtect(m_useSelfForThis));
+                    }
                     puts(assigntop->varp()->nameProtect());
                 } else {
                     iterateAndNextNull(assigntop);
@@ -1195,7 +1234,9 @@ public:
                 if (!assigntop) {
                     puts(assignString);
                 } else if (VN_IS(assigntop, VarRef)) {
-                    puts(assigntop->hiernameProtect());
+                    if (!assigntop->selfPointer().empty()) {
+                        emitDereference(assigntop->selfPointerProtect(m_useSelfForThis));
+                    }
                     puts(assigntop->varp()->nameProtect());
                 } else {
                     iterateAndNextNull(assigntop);
@@ -1337,16 +1378,85 @@ public:
 
 unsigned EmitVarTspSorter::s_serialNext = 0;
 
+//######################################################################
+// Emit lazy forward declarations
+
+class EmitCLazyDecls final : public AstNVisitor {
+    // NODE STATE/TYPES
+    //  AstNode::user2() -> bool. Already emitted decl for symbols.
+    AstUser2InUse m_inuser2;
+
+    // MEMBERS
+    std::unordered_set<string> m_emittedManually;  // Set of names already declared manually.
+    EmitCBaseVisitor& m_emitter;  // For access to file output
+    bool m_needsBlankLine = false;  // Emit blank line if any declarations were emitted (cosmetic)
+
+    void lazyDeclare(AstCFunc* funcp) {
+        if (funcp->user2SetOnce()) return;  // Already declared
+        if (!funcp->isMethod() || !funcp->isLoose()) return;  // Not lazily declared
+        if (m_emittedManually.count(funcp->nameProtect())) return;  // Already declared manually
+        m_emitter.emitCFuncDecl(funcp, VN_CAST_CONST(funcp->user4p(), NodeModule));
+        m_needsBlankLine = true;
+    }
+
+    virtual void visit(AstNodeCCall* nodep) override {
+        lazyDeclare(nodep->funcp());
+        iterateChildren(nodep);
+    }
+
+    virtual void visit(AstAddrOfCFunc* nodep) override {  //
+        lazyDeclare(nodep->funcp());
+    }
+
+    virtual void visit(AstExecGraph* nodep) override {
+        if (nodep->user2SetOnce()) return;  // Already declared
+        // Build the list of initial mtasks to start
+        for (const ExecMTask* mtp : nodep->rootMTasks()) {
+            m_emitter.puts("void ");
+            m_emitter.puts(EmitCBaseVisitor::topClassName() + "__"
+                           + EmitCBaseVisitor::protect(mtp->cFuncName()));
+            m_emitter.puts("(void* voidSelf, bool even_cycle);\n");
+            m_needsBlankLine = true;
+        }
+    }
+
+    virtual void visit(AstNode* nodep) override { iterateChildrenConst(nodep); }
+
+    VL_DEBUG_FUNC;
+
+public:
+    EmitCLazyDecls(EmitCBaseVisitor& emitter)
+        : m_emitter(emitter) {}
+    void emit(AstNode* nodep) {
+        m_needsBlankLine = false;
+        iterateChildrenConst(nodep);
+        if (m_needsBlankLine) m_emitter.puts("\n");
+    }
+    void emit(const string& prefix, const string& name, const string& suffix) {
+        m_emittedManually.insert(name);
+        m_emitter.ensureNewLine();
+        m_emitter.puts(prefix);
+        m_emitter.puts(name);
+        m_emitter.puts(suffix);
+        m_emitter.ensureNewLine();
+    }
+    void declared(AstCFunc* nodep) { nodep->user2SetOnce(); }
+    void reset() { AstNode::user2ClearTree(); }
+};
+
 //######################################################################
 // Internal EmitC implementation
 
 class EmitCImp final : EmitCStmts {
+    // NODE STATE/TYPES
+    //  AstNode::user2() -> bool. Used by EmitCLazyDecls (already declared)
+
     // MEMBERS
-    AstNodeModule* m_modp = nullptr;
     AstNodeModule* m_fileModp = nullptr;  // Files (names, headers) constructed using this module
     std::vector<AstChangeDet*> m_blkChangeDetVec;  // All encountered changes in block
     bool m_slow = false;  // Creating __Slow file
     bool m_fast = false;  // Creating non __Slow file (or both)
+    EmitCLazyDecls m_lazyDecls;  // Visitor for emitting lazy declarations
 
     //---------------------------------------
     // METHODS
@@ -1393,6 +1503,8 @@ class EmitCImp final : EmitCStmts {
     }
 
     V3OutCFile* newOutCFile(bool slow, bool source, int filenum = 0) {
+        m_lazyDecls.reset();  // Need to emit new lazy declarations
+
         string filenameNoExt = v3Global.opt.makeDir() + "/" + prefixNameProtect(m_fileModp);
         if (filenum) filenameNoExt += "__" + cvtToStr(filenum);
         filenameNoExt += (slow ? "__Slow" : "");
@@ -1450,7 +1562,7 @@ class EmitCImp final : EmitCStmts {
     void emitMTaskBody(AstMTaskBody* nodep) {
         ExecMTask* curExecMTaskp = nodep->execMTaskp();
         if (packedMTaskMayBlock(curExecMTaskp)) {
-            puts("vlTOPp->__Vm_mt_" + cvtToStr(curExecMTaskp->id())
+            puts("vlSelf->__Vm_mt_" + cvtToStr(curExecMTaskp->id())
                  + ".waitUntilUpstreamDone(even_cycle);\n");
         }
 
@@ -1459,9 +1571,9 @@ class EmitCImp final : EmitCStmts {
             recName = "__Vprfthr_" + cvtToStr(curExecMTaskp->id());
             puts("VlProfileRec* " + recName + " = nullptr;\n");
             // Leave this if() here, as don't want to call VL_RDTSC_Q unless profiling
-            puts("if (VL_UNLIKELY(vlTOPp->__Vm_profile_cycle_start)) {\n");
-            puts(recName + " = vlTOPp->__Vm_threadPoolp->profileAppend();\n");
-            puts(recName + "->startRecord(VL_RDTSC_Q() - vlTOPp->__Vm_profile_cycle_start,");
+            puts("if (VL_UNLIKELY(vlSelf->__Vm_profile_cycle_start)) {\n");
+            puts(recName + " = vlSelf->__Vm_threadPoolp->profileAppend();\n");
+            puts(recName + "->startRecord(VL_RDTSC_Q() - vlSelf->__Vm_profile_cycle_start,");
             puts(" " + cvtToStr(curExecMTaskp->id()) + ",");
             puts(" " + cvtToStr(curExecMTaskp->cost()) + ");\n");
             puts("}\n");
@@ -1474,7 +1586,7 @@ class EmitCImp final : EmitCStmts {
         if (v3Global.opt.profThreads()) {
             // Leave this if() here, as don't want to call VL_RDTSC_Q unless profiling
             puts("if (VL_UNLIKELY(" + recName + ")) {\n");
-            puts(recName + "->endRecord(VL_RDTSC_Q() - vlTOPp->__Vm_profile_cycle_start);\n");
+            puts(recName + "->endRecord(VL_RDTSC_Q() - vlSelf->__Vm_profile_cycle_start);\n");
             puts("}\n");
         }
 
@@ -1486,7 +1598,7 @@ class EmitCImp final : EmitCStmts {
         for (V3GraphEdge* edgep = curExecMTaskp->outBeginp(); edgep; edgep = edgep->outNextp()) {
             const ExecMTask* nextp = dynamic_cast<ExecMTask*>(edgep->top());
             if (nextp->thread() != curExecMTaskp->thread()) {
-                puts("vlTOPp->__Vm_mt_" + cvtToStr(nextp->id())
+                puts("vlSelf->__Vm_mt_" + cvtToStr(nextp->id())
                      + ".signalUpstreamDone(even_cycle);\n");
             }
         }
@@ -1497,26 +1609,28 @@ class EmitCImp final : EmitCStmts {
             emitMTaskBody(nextp->bodyp());
         } else {
             // Unblock the fake "final" mtask
-            puts("vlTOPp->__Vm_mt_final.signalUpstreamDone(even_cycle);\n");
+            puts("vlSelf->__Vm_mt_final.signalUpstreamDone(even_cycle);\n");
         }
     }
 
     virtual void visit(AstMTaskBody* nodep) override {
+        VL_RESTORER(m_useSelfForThis);
         maybeSplit();
         splitSizeInc(10);
 
-        const ExecMTask* const mtp = nodep->execMTaskp();
         puts("\n");
+        for (const ExecMTask* mtp = nodep->execMTaskp(); mtp; mtp = mtp->packNextp()) {
+            m_lazyDecls.emit(mtp->bodyp());
+        }
         puts("void ");
-        puts(prefixNameProtect(m_modp) + "::" + protect(mtp->cFuncName()));
-        puts("(bool even_cycle, void* symtab) {\n");
-
-        // Declare and set vlSymsp
-        puts(EmitCBaseVisitor::symClassVar() + " = (" + EmitCBaseVisitor::symClassName()
-             + "*)symtab;\n");
-        puts(EmitCBaseVisitor::symTopAssign() + "\n");
-
+        puts(topClassName() + "__" + protect(nodep->execMTaskp()->cFuncName()));
+        puts("(void* voidSelf, bool even_cycle) {\n");
+        puts(topClassName() + "* const vlSelf = static_cast<" + topClassName()
+             + "*>(voidSelf);\n");
+        m_useSelfForThis = true;
+        puts(symClassAssign());
         emitMTaskBody(nodep);
+        ensureNewLine();
         puts("}\n");
     }
 
@@ -1529,6 +1643,8 @@ class EmitCImp final : EmitCStmts {
         if (nodep->dpiImport()) return;
         if (!(nodep->slow() ? m_slow : m_fast)) return;
 
+        VL_RESTORER(m_useSelfForThis);
+
         maybeSplit();
 
         m_blkChangeDetVec.clear();
@@ -1536,17 +1652,10 @@ class EmitCImp final : EmitCStmts {
         splitSizeInc(nodep);
 
         puts("\n");
+        m_lazyDecls.emit(nodep);
         if (nodep->ifdef() != "") puts("#ifdef " + nodep->ifdef() + "\n");
         if (nodep->isInline()) puts("VL_INLINE_OPT ");
-        if (!nodep->isConstructor() && !nodep->isDestructor()) {
-            puts(nodep->rtnTypeVoid());
-            puts(" ");
-        }
-
-        if (nodep->isMethod()) puts(prefixNameProtect(m_modp) + "::");
-        puts(funcNameProtect(nodep, m_modp));
-        puts("(" + cFuncArgs(nodep) + ")");
-        if (nodep->isConst().trueKnown()) puts(" const");
+        emitCFuncHeader(nodep, m_modp, /* withScope: */ true);
 
         // TODO perhaps better to have a new AstCCtorInit so we can pass arguments
         // rather than requiring a string here
@@ -1556,13 +1665,21 @@ class EmitCImp final : EmitCStmts {
         }
         puts(" {\n");
 
+        if (nodep->isLoose()) {
+            m_lazyDecls.declared(nodep);  // Defined here, so no longer needs declaration
+            if (nodep->isStatic().falseUnknown()) {  // Standard prologue
+                m_useSelfForThis = true;
+                puts("if (false && vlSelf) {}  // Prevent unused\n");
+                if (!VN_IS(m_modp, Class)) puts(symClassAssign());
+            }
+        }
+
         // "+" in the debug indicates a print from the model
         puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+  ");
         for (int i = 0; i < m_modp->level(); ++i) { puts("  "); }
-        puts(prefixNameProtect(m_modp) + "::" + nodep->nameProtect() + "\\n\"); );\n");
-
-        // Declare and set vlTOPp
-        if (nodep->symProlog()) puts(EmitCBaseVisitor::symTopAssign() + "\n");
+        puts(prefixNameProtect(m_modp));
+        puts(nodep->isLoose() ? "__" : "::");
+        puts(nodep->nameProtect() + "\\n\"); );\n");
 
         if (nodep->initsp()) putsDecoration("// Variables\n");
         for (AstNode* subnodep = nodep->argsp(); subnodep; subnodep = subnodep->nextp()) {
@@ -1586,7 +1703,6 @@ class EmitCImp final : EmitCStmts {
 
         if (!m_blkChangeDetVec.empty()) puts("return __req;\n");
 
-        // puts("__Vm_activity = true;\n");
         puts("}\n");
         if (nodep->ifdef() != "") puts("#endif  // " + nodep->ifdef() + "\n");
     }
@@ -1695,37 +1811,28 @@ class EmitCImp final : EmitCStmts {
         // Don't recurse to children -- this isn't the place to emit
         // function definitions for the nested CFuncs. We'll do that at the
         // end.
-        puts("vlTOPp->__Vm_even_cycle = !vlTOPp->__Vm_even_cycle;\n");
+        puts("vlSelf->__Vm_even_cycle = !vlSelf->__Vm_even_cycle;\n");
 
         // Build the list of initial mtasks to start
-        std::vector<const ExecMTask*> execMTasks;
-
-        // Start each root mtask
-        for (const V3GraphVertex* vxp = nodep->depGraphp()->verticesBeginp(); vxp;
-             vxp = vxp->verticesNextp()) {
-            const ExecMTask* etp = dynamic_cast<const ExecMTask*>(vxp);
-            if (etp->threadRoot()) execMTasks.push_back(etp);
-        }
-        UASSERT_OBJ(execMTasks.size() <= static_cast<unsigned>(v3Global.opt.threads()), nodep,
-                    "More root mtasks than available threads");
+        std::vector<const ExecMTask*> execMTasks = nodep->rootMTasks();
 
         if (!execMTasks.empty()) {
             for (uint32_t i = 0; i < execMTasks.size(); ++i) {
-                bool runInline = (i == execMTasks.size() - 1);
+                const bool runInline = (i == execMTasks.size() - 1);
+                const string protName
+                    = topClassName() + "__" + protect(execMTasks[i]->cFuncName());
                 if (runInline) {
                     // The thread calling eval() will run this mtask inline,
                     // along with its packed successors.
-                    puts(protect(execMTasks[i]->cFuncName())
-                         + "(vlTOPp->__Vm_even_cycle, vlSymsp);\n");
+                    puts(protName + "(vlSelf, vlSelf->__Vm_even_cycle);\n");
                     puts("Verilated::mtaskId(0);\n");
                 } else {
                     // The other N-1 go to the thread pool.
-                    puts("vlTOPp->__Vm_threadPoolp->workerp(" + cvtToStr(i) + ")->addTask("
-                         + protect(execMTasks[i]->cFuncName())
-                         + ", vlTOPp->__Vm_even_cycle, vlSymsp);\n");
+                    puts("vlSelf->__Vm_threadPoolp->workerp(" + cvtToStr(i) + ")->addTask("
+                         + protName + ", vlSelf, vlSelf->__Vm_even_cycle);\n");
                 }
             }
-            puts("vlTOPp->__Vm_mt_final.waitUntilUpstreamDone(vlTOPp->__Vm_even_cycle);\n");
+            puts("vlSelf->__Vm_mt_final.waitUntilUpstreamDone(vlSelf->__Vm_even_cycle);\n");
         }
     }
 
@@ -1755,7 +1862,7 @@ class EmitCImp final : EmitCStmts {
     void emitVarReset(AstVar* varp) {
         AstNodeDType* const dtypep = varp->dtypep()->skipRefp();
         const string varNameProtected
-            = VN_IS(m_modp, Class) ? varp->nameProtect() : "self->" + varp->nameProtect();
+            = VN_IS(m_modp, Class) ? varp->nameProtect() : "vlSelf->" + varp->nameProtect();
         if (varp->isIO() && m_modp->isTop() && optSystemC()) {
             // System C top I/O doesn't need loading, as the lower level subinst code does it.}
         } else if (varp->isParam()) {
@@ -1878,9 +1985,9 @@ class EmitCImp final : EmitCStmts {
     // High level
     void emitImpTop();
     void emitImp(AstNodeModule* modp);
-    void emitSettleLoop(const std::string& eval_call, bool initial);
-    void emitWrapEval(AstNodeModule* modp);
-    void emitWrapFast(AstNodeModule* modp);
+    void emitSettleLoop(bool initial);
+    void emitWrapEval();
+    void emitWrapFast();
     void emitMTaskState();
     void emitMTaskVertexCtors(bool* firstp);
     void emitIntTop(AstNodeModule* modp);
@@ -1888,7 +1995,8 @@ class EmitCImp final : EmitCStmts {
     void maybeSplit();
 
 public:
-    EmitCImp() = default;
+    EmitCImp()
+        : m_lazyDecls(*this) {}
     virtual ~EmitCImp() override = default;
     void mainImp(AstNodeModule* modp, bool slow);
     void mainInt(AstNodeModule* modp);
@@ -2080,7 +2188,9 @@ void EmitCStmts::emitOpName(AstNode* nodep, const string& format, AstNode* lhsp,
                     UASSERT_OBJ(m_wideTempRefp, nodep,
                                 "Wide Op w/ no temp, perhaps missing op in V3EmitC?");
                     COMMA;
-                    puts(m_wideTempRefp->hiernameProtect());
+                    if (!m_wideTempRefp->selfPointer().empty()) {
+                        emitDereference(m_wideTempRefp->selfPointerProtect(m_useSelfForThis));
+                    }
                     puts(m_wideTempRefp->varp()->nameProtect());
                     m_wideTempRefp = nullptr;
                     needComma = true;
@@ -2408,7 +2518,7 @@ void EmitCStmts::displayNode(AstNode* nodep, AstScopeName* scopenamep, const str
 
 void EmitCImp::emitCoverageDecl(AstNodeModule*) {
     if (v3Global.opt.coverage()) {
-        ofp()->putsPrivate(true);
+        ofp()->putsPrivate(false);  // Accessed from loose methods
         putsDecoration("// Coverage\n");
         puts("void __vlCoverInsert(");
         puts(v3Global.opt.threads() ? "std::atomic<uint32_t>" : "uint32_t");
@@ -2456,18 +2566,24 @@ void EmitCImp::emitCtorImp(AstNodeModule* modp) {
     string section;
     emitParams(modp, true, &first, section /*ref*/);
 
+    const string modName = prefixNameProtect(modp);
+
+    puts("\n");
+    m_lazyDecls.emit("void " + modName + "__", protect("_ctor_var_reset"),
+                     "(" + modName + "* vlSelf);");
+    puts("\n");
+
     if (VN_IS(modp, Class)) {
         modp->v3fatalSrc("constructors should be AstCFuncs instead");
     } else if (optSystemC() && modp->isTop()) {
-        puts(prefixNameProtect(modp) + "::" + prefixNameProtect(modp) + "(sc_module_name)");
+        puts(modName + "::" + modName + "(sc_module_name)");
     } else if (modp->isTop()) {
-        puts(prefixNameProtect(modp) + "::" + prefixNameProtect(modp)
+        puts(modName + "::" + modName
              + "(VerilatedContext* _vcontextp__, const char* _vcname__)\n");
         puts("    : VerilatedModule{_vcname__}\n");
         first = false;  // printed the first ':'
     } else {
-        puts(prefixNameProtect(modp) + "::" + prefixNameProtect(modp)
-             + "(const char* _vcname__)\n");
+        puts(modName + "::" + modName + "(const char* _vcname__)\n");
         puts("    : VerilatedModule(_vcname__)\n");
     }
     emitVarCtors(&first);
@@ -2483,7 +2599,7 @@ void EmitCImp::emitCtorImp(AstNodeModule* modp) {
         puts("\n");
     }
     putsDecoration("// Reset structure values\n");
-    puts(protect("_ctor_var_reset") + "(this);\n");
+    puts(modName + "__" + protect("_ctor_var_reset") + "(this);\n");
     emitTextSection(AstType::atScCtor);
 
     if (modp->isTop() && v3Global.opt.mtasks()) {
@@ -2521,13 +2637,20 @@ void EmitCImp::emitCtorImp(AstNodeModule* modp) {
 }
 
 void EmitCImp::emitConfigureImp(AstNodeModule* modp) {
-    puts("\nvoid " + prefixNameProtect(modp) + "::" + protect("__Vconfigure") + "("
-         + symClassName() + "* vlSymsp, bool first) {\n");
-    puts("if (false && first) {}  // Prevent unused\n");
-    puts("this->__VlSymsp = vlSymsp;\n");  // First, as later stuff needs it.
-    puts("if (false && this->__VlSymsp) {}  // Prevent unused\n");
+    const string modName = prefixNameProtect(modp);
+
     if (v3Global.opt.coverage()) {
-        puts(protect("_configure_coverage") + "(this, vlSymsp, first);\n");
+        puts("\n");
+        m_lazyDecls.emit("void " + modName + "__", protect("_configure_coverage"),
+                         "(" + modName + "* vlSelf, bool first);");
+    }
+
+    puts("\nvoid " + modName + "::" + protect("__Vconfigure") + "(" + symClassName()
+         + "* vlSymsp, bool first) {\n");
+    puts("if (false && first) {}  // Prevent unused\n");
+    puts("this->vlSymsp = vlSymsp;\n");  // First, as later stuff needs it.
+    if (v3Global.opt.coverage()) {
+        puts(modName + "__" + protect("_configure_coverage") + "(this, first);\n");
     }
     if (modp->isTop() && !v3Global.rootp()->timeunit().isNone()) {
         puts("vlSymsp->_vm_contextp__->timeunit("
@@ -2562,12 +2685,12 @@ void EmitCImp::emitCoverageImp(AstNodeModule*) {
         // Used for second++ instantiation of identical bin
         puts("if (!enable) count32p = &fake_zero_count;\n");
         puts("*count32p = 0;\n");
-        puts("VL_COVER_INSERT(__VlSymsp->_vm_contextp__->coveragep(), count32p,");
+        puts("VL_COVER_INSERT(vlSymsp->_vm_contextp__->coveragep(), count32p,");
         puts("  \"filename\",filenamep,");
         puts("  \"lineno\",lineno,");
         puts("  \"column\",column,\n");
         // Need to move hier into scopes and back out if do this
-        // puts( "\"hier\",std::string(__VlSymsp->name())+hierp,");
+        // puts( "\"hier\",std::string(vlSymsp->name())+hierp,");
         puts("\"hier\",std::string(name())+hierp,");
         puts("  \"page\",pagep,");
         puts("  \"comment\",commentp,");
@@ -2587,12 +2710,12 @@ void EmitCImp::emitDestructorImp(AstNodeModule* modp) {
         // Call via function in __Trace.cpp as this .cpp file does not have trace header
         if (v3Global.needTraceDumper()) {
             puts("#ifdef VM_TRACE\n");
-            puts("if (VL_UNLIKELY(__VlSymsp->__Vm_dumping)) _traceDumpClose();\n");
+            puts("if (VL_UNLIKELY(vlSymsp->__Vm_dumping)) _traceDumpClose();\n");
             puts("#endif  // VM_TRACE\n");
         }
     }
     emitTextSection(AstType::atScDtor);
-    if (modp->isTop()) puts("VL_DO_CLEAR(delete __VlSymsp, __VlSymsp = nullptr);\n");
+    if (modp->isTop()) puts("VL_DO_CLEAR(delete vlSymsp, vlSymsp = nullptr);\n");
     puts("}\n");
     splitSizeInc(10);
 }
@@ -2629,7 +2752,7 @@ void EmitCImp::emitSavableImp(AstNodeModule* modp) {
             // If multiple models save the same context we'll save it multiple
             // times, but is harmless, and doing it otherwise would break
             // backwards compatibility.
-            puts("os " + op + " __VlSymsp->_vm_contextp__;\n");
+            puts("os " + op + " vlSymsp->_vm_contextp__;\n");
 
             // Save all members
             if (v3Global.opt.inhibitSim()) puts("os" + op + "__Vm_inhibitSim;\n");
@@ -2674,7 +2797,7 @@ void EmitCImp::emitSavableImp(AstNodeModule* modp) {
             }
 
             if (modp->isTop()) {  // Save the children
-                puts("__VlSymsp->" + protect(funcname) + "(os);\n");
+                puts("vlSymsp->" + protect(funcname) + "(os);\n");
             }
             puts("}\n");
         }
@@ -2706,9 +2829,8 @@ void EmitCImp::emitCellCtors(AstNodeModule* modp) {
     if (modp->isTop()) {
         // Must be before other constructors, as __vlCoverInsert calls it
         // Note _vcontextp__ may be nullptr, VerilatedSyms::VerilatedSyms cleans it up
-        puts(EmitCBaseVisitor::symClassVar() + " = __VlSymsp = new " + symClassName() + "("
+        puts(EmitCBaseVisitor::symClassVar() + " = new " + symClassName() + "("
              + (optSystemC() ? "nullptr" : "_vcontextp__") + ", this, name());\n");
-        puts(EmitCBaseVisitor::symTopAssign() + "\n");
     }
     for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
         if (AstCell* cellp = VN_CAST(nodep, Cell)) {
@@ -2752,18 +2874,25 @@ void EmitCImp::emitSensitives() {
     }
 }
 
-void EmitCImp::emitSettleLoop(const std::string& eval_call, bool initial) {
+void EmitCImp::emitSettleLoop(bool initial) {
+    const string self = initial ? "vlSelf" : "this";
     putsDecoration("// Evaluate till stable\n");
     puts("int __VclockLoop = 0;\n");
     puts("QData __Vchange = 1;\n");
+    if (v3Global.opt.trace()) puts("vlSymsp->__Vm_activity = true;\n");
     puts("do {\n");
-    puts(eval_call + "\n");
+    puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+ ");
+    puts(initial ? "Initial" : "Clock");
+    puts(" loop\\n\"););\n");
+    if (initial) puts(topClassName() + "__" + protect("_eval_settle") + "(" + self + ");\n");
+    puts(topClassName() + "__" + protect("_eval") + "(" + self + ");\n");
     puts("if (VL_UNLIKELY(++__VclockLoop > " + cvtToStr(v3Global.opt.convergeLimit()) + ")) {\n");
     puts("// About to fail, so enable debug to see what's not settling.\n");
     puts("// Note you must run make with OPT=-DVL_DEBUG for debug prints.\n");
     puts("int __Vsaved_debug = Verilated::debug();\n");
     puts("Verilated::debug(1);\n");
-    puts("__Vchange = " + protect("_change_request") + "(vlSymsp);\n");
+    puts("__Vchange = " + topClassName() + "__" + protect("_change_request") + "(" + self
+         + ");\n");
     puts("Verilated::debug(__Vsaved_debug);\n");
     puts("VL_FATAL_MT(");
     putsQuoted(protect(m_modp->fileline()->filename()));
@@ -2775,30 +2904,56 @@ void EmitCImp::emitSettleLoop(const std::string& eval_call, bool initial) {
     puts("converge\\n\"\n");
     puts("\"- See https://verilator.org/warn/DIDNOTCONVERGE\");\n");
     puts("} else {\n");
-    puts("__Vchange = " + protect("_change_request") + "(vlSymsp);\n");
+    puts("__Vchange = " + topClassName() + "__" + protect("_change_request") + "(" + self
+         + ");\n");
     puts("}\n");
     puts("} while (VL_UNLIKELY(__Vchange));\n");
 }
 
-void EmitCImp::emitWrapFast(AstNodeModule* modp) {
-    puts("\nVerilatedContext* " + prefixNameProtect(modp) + "::contextp() {\n");
-    puts(/**/ "return __VlSymsp->_vm_contextp__;\n");
+void EmitCImp::emitWrapFast() {
+    UASSERT_OBJ(m_modp->isTop(), m_modp, "Attempting to emitWrapFast for non-top class");
+    puts("\nVerilatedContext* " + topClassName() + "::contextp() const {\n");
+    puts(/**/ "return vlSymsp->_vm_contextp__;\n");
     puts("}\n");
 }
 
-void EmitCImp::emitWrapEval(AstNodeModule* modp) {
-    puts("\nvoid " + prefixNameProtect(modp) + "::eval_step() {\n");
-    puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+++++TOP Evaluate " + prefixNameProtect(modp)
-         + "::eval\\n\"); );\n");
-    puts(EmitCBaseVisitor::symClassVar() + " = this->__VlSymsp;  // Setup global symbol table\n");
-    puts(EmitCBaseVisitor::symTopAssign() + "\n");
+void EmitCImp::emitWrapEval() {
+    UASSERT_OBJ(m_modp->isTop(), m_modp, "Attempting to emitWrapEval for non-top class");
+
+    const string selfDecl = "(" + topClassName() + "* vlSelf)";
+
+    // Forward declarations
+    puts("\n");
+    m_lazyDecls.emit("void " + topClassName() + "__", protect("_eval_initial"), selfDecl + ";");
+    m_lazyDecls.emit("void " + topClassName() + "__", protect("_eval_settle"), selfDecl + ";");
+    m_lazyDecls.emit("void " + topClassName() + "__", protect("_eval"), selfDecl + ";");
+    m_lazyDecls.emit("QData " + topClassName() + "__", protect("_change_request"), selfDecl + ";");
+    puts("#ifdef VL_DEBUG\n");
+    m_lazyDecls.emit("void " + topClassName() + "__", protect("_eval_debug_assertions"),
+                     selfDecl + ";");
+    puts("#endif  // VL_DEBUG\n");
+    m_lazyDecls.emit("void " + topClassName() + "__", protect("_final"), selfDecl + ";");
+
+    // _eval_initial_loop
+    puts("\nstatic void " + protect("_eval_initial_loop") + selfDecl + " {\n");
+    puts(symClassAssign());
+    puts("vlSymsp->__Vm_didInit = true;\n");
+    puts(topClassName() + "__" + protect("_eval_initial") + "(vlSelf);\n");
+    emitSettleLoop(/* initial: */ true);
+    ensureNewLine();
+    puts("}\n");
+
+    // ::eval_step
+    puts("\nvoid " + topClassName() + "::eval_step() {\n");
+    puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+++++TOP Evaluate " + topClassName()
+         + "::eval_step\\n\"); );\n");
     puts("#ifdef VL_DEBUG\n");
     putsDecoration("// Debug assertions\n");
-    puts(protect("_eval_debug_assertions") + "();\n");
+    puts(topClassName() + "__" + protect("_eval_debug_assertions") + "(this);\n");
     puts("#endif  // VL_DEBUG\n");
     putsDecoration("// Initialize\n");
     puts("if (VL_UNLIKELY(!vlSymsp->__Vm_didInit)) " + protect("_eval_initial_loop")
-         + "(vlSymsp);\n");
+         + "(this);\n");
     if (v3Global.opt.inhibitSim()) puts("if (VL_UNLIKELY(__Vm_inhibitSim)) return;\n");
 
     if (v3Global.opt.threads() == 1) {
@@ -2814,45 +2969,42 @@ void EmitCImp::emitWrapEval(AstNodeModule* modp) {
         puts(" && (VL_TIME_Q() > vlSymsp->_vm_contextp__->profThreadsStart())\n");
         puts(" && (vlSymsp->_vm_contextp__->profThreadsWindow() >= 1))) {\n");
         // Within a profile (either starting, middle, or end)
-        puts("if (vlTOPp->__Vm_profile_window_ct == 0) {\n");  // Opening file?
+        puts("if (__Vm_profile_window_ct == 0) {\n");  // Opening file?
         // Start profile on this cycle. We'll capture a window worth, then
         // only analyze the next window worth. The idea is that the first window
         // capture will hit some cache-cold stuff (eg printf) but it'll be warm
         // by the time we hit the second window, we hope.
-        puts("vlTOPp->__Vm_profile_cycle_start = VL_RDTSC_Q();\n");
+        puts("__Vm_profile_cycle_start = VL_RDTSC_Q();\n");
         // "* 2" as first half is warmup, second half is collection
-        puts("vlTOPp->__Vm_profile_window_ct = vlSymsp->_vm_contextp__->profThreadsWindow() * 2 + "
+        puts("__Vm_profile_window_ct = vlSymsp->_vm_contextp__->profThreadsWindow() * 2 "
+             "+ "
              "1;\n");
         puts("}\n");
-        puts("--vlTOPp->__Vm_profile_window_ct;\n");
-        puts("if (vlTOPp->__Vm_profile_window_ct == "
-             "(vlSymsp->_vm_contextp__->profThreadsWindow())) {\n");
+        puts("--__Vm_profile_window_ct;\n");
+        puts("if (__Vm_profile_window_ct == vlSymsp->_vm_contextp__->profThreadsWindow()) "
+             "{\n");
         // This barrier record in every threads' profile demarcates the
         // cache-warm-up cycles before the barrier from the actual profile
         // cycles afterward.
-        puts("vlTOPp->__Vm_threadPoolp->profileAppendAll(");
+        puts("__Vm_threadPoolp->profileAppendAll(");
         puts("VlProfileRec(VlProfileRec::Barrier()));\n");
-        puts("vlTOPp->__Vm_profile_cycle_start = VL_RDTSC_Q();\n");
+        puts("__Vm_profile_cycle_start = VL_RDTSC_Q();\n");
         puts("}\n");
-        puts("else if (vlTOPp->__Vm_profile_window_ct == 0) {\n");
+        puts("else if (__Vm_profile_window_ct == 0) {\n");
         // Ending file.
-        puts("vluint64_t elapsed = VL_RDTSC_Q() - vlTOPp->__Vm_profile_cycle_start;\n");
-        puts(
-            "vlTOPp->__Vm_threadPoolp->profileDump(vlSymsp->_vm_contextp__->profThreadsFilename()."
-            "c_str(), elapsed);\n");
+        puts("vluint64_t elapsed = VL_RDTSC_Q() - __Vm_profile_cycle_start;\n");
+        puts("__Vm_threadPoolp->profileDump(vlSymsp->_vm_contextp__->profThreadsFilename()."
+             "c_str(), elapsed);\n");
         // This turns off the test to enter the profiling code, but still
         // allows the user to collect another profile by changing
         // profThreadsStart
         puts("__Vm_profile_time_finished = vlSymsp->_vm_contextp__->profThreadsStart();\n");
-        puts("vlTOPp->__Vm_profile_cycle_start = 0;\n");
+        puts("__Vm_profile_cycle_start = 0;\n");
         puts("}\n");
         puts("}\n");
     }
 
-    emitSettleLoop((string("VL_DEBUG_IF(VL_DBG_MSGF(\"+ Clock loop\\n\"););\n")
-                    + (v3Global.opt.trace() ? "vlSymsp->__Vm_activity = true;\n" : "")
-                    + protect("_eval") + "(vlSymsp);"),
-                   false);
+    emitSettleLoop(/* initial: */ false);
     if (v3Global.opt.threads() == 1) {
         puts("Verilated::endOfThreadMTask(vlSymsp->__Vm_evalMsgQp);\n");
     }
@@ -2860,31 +3012,23 @@ void EmitCImp::emitWrapEval(AstNodeModule* modp) {
     puts("}\n");
     splitSizeInc(10);
 
-    //
+    // ::eval_end_step
     if (v3Global.needTraceDumper() && !optSystemC()) {
-        puts("\nvoid " + prefixNameProtect(modp) + "::eval_end_step() {\n");
-        puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+eval_end_step " + prefixNameProtect(modp)
+        puts("\nvoid " + topClassName() + "::eval_end_step() {\n");
+        puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+eval_end_step " + topClassName()
              + "::eval_end_step\\n\"); );\n");
         puts("#ifdef VM_TRACE\n");
-        puts(EmitCBaseVisitor::symClassVar()
-             + " = this->__VlSymsp;  // Setup global symbol table\n");
-        puts(EmitCBaseVisitor::symTopAssign() + "\n");
         putsDecoration("// Tracing\n");
         // SystemC's eval loop deals with calling trace, not us
         puts("if (VL_UNLIKELY(vlSymsp->__Vm_dumping)) _traceDump();\n");
         puts("#endif  // VM_TRACE\n");
         puts("}\n");
+        splitSizeInc(10);
     }
 
-    //
-    puts("\nvoid " + prefixNameProtect(modp) + "::" + protect("_eval_initial_loop") + "("
-         + EmitCBaseVisitor::symClassVar() + ") {\n");
-    puts("vlSymsp->__Vm_didInit = true;\n");
-    puts(protect("_eval_initial") + "(vlSymsp);\n");
-    if (v3Global.opt.trace()) puts("vlSymsp->__Vm_activity = true;\n");
-    emitSettleLoop((protect("_eval_settle") + "(vlSymsp);\n"  //
-                    + protect("_eval") + "(vlSymsp);"),
-                   true);
+    // ::final
+    puts("\nvoid " + topClassName() + "::final() {\n");
+    puts(topClassName() + "__" + protect("_final") + "(this);\n");
     puts("}\n");
     splitSizeInc(10);
 }
@@ -3079,7 +3223,7 @@ void EmitCStmts::emitSortedVarList(const VarVec& anons, const VarVec& nonanons,
 }
 
 void EmitCImp::emitMTaskState() {
-    ofp()->putsPrivate(true);
+    ofp()->putsPrivate(false);  // Accessed from loose function
     AstExecGraph* execGraphp = v3Global.rootp()->execGraphp();
     UASSERT_OBJ(execGraphp, v3Global.rootp(), "Root should have an execGraphp");
 
@@ -3201,8 +3345,8 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
     puts("\n// INTERNAL VARIABLES\n");
     if (modp->isTop()) puts("// Internals; generally not touched by application code\n");
     if (!VN_IS(modp, Class)) {  // Avoid clang unused error (& don't want in every object)
-        ofp()->putsPrivate(!modp->isTop());  // private: unless top
-        puts(symClassName() + "* __VlSymsp;  // Symbol table\n");
+        ofp()->putsPrivate(false);  // public: so loose methods can pick it up
+        puts(symClassName() + "* vlSymsp;  // Symbol table\n");
     }
     ofp()->putsPrivate(false);  // public:
     if (modp->isTop()) {
@@ -3282,7 +3426,7 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
         puts("\n// API METHODS\n");
         puts("/// Return current simulation context for this model.\n");
         puts("/// Used to get to e.g. simulation time via contextp()->time()\n");
-        puts("VerilatedContext* contextp();\n");
+        puts("VerilatedContext* contextp() const;\n");
 
         string callEvalEndStep
             = (v3Global.needTraceDumper() && !optSystemC()) ? "eval_end_step(); " : "";
@@ -3321,9 +3465,7 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
 
     puts("\n// INTERNAL METHODS\n");
     if (modp->isTop()) {
-        ofp()->putsPrivate(false);  // public: as accessed by another VL_MODULE
-        puts("static void " + protect("_eval_initial_loop") + "(" + EmitCBaseVisitor::symClassVar()
-             + ");\n");
+        ofp()->putsPrivate(false);  // public: as accessed by loose functions
         if (v3Global.needTraceDumper()) {
             if (!optSystemC()) puts("void _traceDump();\n");
             puts("void _traceDumpOpen();\n");
@@ -3339,11 +3481,6 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
     ofp()->putsPrivate(false);  // public:
     emitIntFuncDecls(modp, true);
 
-    if (v3Global.opt.trace() && !VN_IS(modp, Class)) {
-        ofp()->putsPrivate(true);  // private:
-        puts("static void " + protect("traceInit") + "(void* userp, "
-             + v3Global.opt.traceClassBase() + "* tracep, uint32_t code) VL_ATTR_COLD;\n");
-    }
     if (v3Global.opt.savable()) {
         ofp()->putsPrivate(false);  // public:
         puts("void " + protect("__Vserialize") + "(VerilatedSerialize& os);\n");
@@ -3402,8 +3539,8 @@ void EmitCImp::emitImp(AstNodeModule* modp) {
     if (m_fast) {
         emitTextSection(AstType::atScImp);
         if (modp->isTop()) {
-            emitWrapFast(modp);
-            emitWrapEval(modp);
+            emitWrapFast();
+            emitWrapEval();
         }
     }
 
@@ -3496,7 +3633,8 @@ void EmitCImp::mainImp(AstNodeModule* modp, bool slow) {
 class EmitCTrace final : EmitCStmts {
     // NODE STATE/TYPES
     // Cleared on netlist
-    //  AstNode::user1()        -> int.  Enum number
+    //  AstNode::user1() -> int.  Enum number
+    //  AstNode::user2() -> bool. Used by EmitCLazyDecls (already declared)
     AstUser1InUse m_inuser1;
 
     // MEMBERS
@@ -3504,9 +3642,12 @@ class EmitCTrace final : EmitCStmts {
     bool m_slow;  // Making slow file
     int m_enumNum = 0;  // Enumeration number (whole netlist)
     int m_baseCode = -1;  // Code of first AstTraceInc in this function
+    EmitCLazyDecls m_lazyDecls;  // Visitor for emitting lazy declarations
 
     // METHODS
     void newOutCFile(int filenum) {
+        m_lazyDecls.reset();  // Need to emit new lazy declarations
+
         string filename
             = (v3Global.opt.makeDir() + "/" + topClassName() + "_" + protect("_Trace"));
         if (filenum) filename += "__" + cvtToStr(filenum);
@@ -3537,64 +3678,74 @@ class EmitCTrace final : EmitCStmts {
     }
 
     void emitTraceSlow() {
-        puts("\n//======================\n\n");
+        puts("\n//======================\n");
 
         if (v3Global.needTraceDumper() && !optSystemC()) {
-            puts("void " + topClassName() + "::_traceDump() {\n");
+            puts("\nvoid " + topClassName() + "::_traceDump() {\n");
             // Caller checked for __Vm_dumperp non-nullptr
-            puts("const VerilatedLockGuard lock(__VlSymsp->__Vm_dumperMutex);\n");
-            puts("__VlSymsp->__Vm_dumperp->dump(VL_TIME_Q());\n");
+            puts("const VerilatedLockGuard lock(vlSymsp->__Vm_dumperMutex);\n");
+            puts("vlSymsp->__Vm_dumperp->dump(VL_TIME_Q());\n");
             puts("}\n");
             splitSizeInc(10);
         }
 
         if (v3Global.needTraceDumper()) {
-            puts("void " + topClassName() + "::_traceDumpOpen() {\n");
-            puts("const VerilatedLockGuard lock(__VlSymsp->__Vm_dumperMutex);\n");
-            puts("if (VL_UNLIKELY(!__VlSymsp->__Vm_dumperp)) {\n");
-            puts("__VlSymsp->__Vm_dumperp = new " + v3Global.opt.traceClassLang() + "();\n");
-            puts("trace(__VlSymsp->__Vm_dumperp, 0, 0);\n");
-            puts("std::string dumpfile = __VlSymsp->_vm_contextp__->dumpfileCheck();\n");
-            puts("__VlSymsp->__Vm_dumperp->open(dumpfile.c_str());\n");
-            puts("__VlSymsp->__Vm_dumping = true;\n");
+            puts("\nvoid " + topClassName() + "::_traceDumpOpen() {\n");
+            puts("const VerilatedLockGuard lock(vlSymsp->__Vm_dumperMutex);\n");
+            puts("if (VL_UNLIKELY(!vlSymsp->__Vm_dumperp)) {\n");
+            puts("vlSymsp->__Vm_dumperp = new " + v3Global.opt.traceClassLang() + "();\n");
+            puts("trace(vlSymsp->__Vm_dumperp, 0, 0);\n");
+            puts("std::string dumpfile = vlSymsp->_vm_contextp__->dumpfileCheck();\n");
+            puts("vlSymsp->__Vm_dumperp->open(dumpfile.c_str());\n");
+            puts("vlSymsp->__Vm_dumping = true;\n");
             puts("}\n");
             puts("}\n");
             splitSizeInc(10);
 
-            puts("void " + topClassName() + "::_traceDumpClose() {\n");
-            puts("const VerilatedLockGuard lock(__VlSymsp->__Vm_dumperMutex);\n");
-            puts("__VlSymsp->__Vm_dumping = false;\n");
-            puts("VL_DO_CLEAR(delete __VlSymsp->__Vm_dumperp, __VlSymsp->__Vm_dumperp = "
+            puts("\nvoid " + topClassName() + "::_traceDumpClose() {\n");
+            puts("const VerilatedLockGuard lock(vlSymsp->__Vm_dumperMutex);\n");
+            puts("vlSymsp->__Vm_dumping = false;\n");
+            puts("VL_DO_CLEAR(delete vlSymsp->__Vm_dumperp, vlSymsp->__Vm_dumperp = "
                  "nullptr);\n");
             puts("}\n");
             splitSizeInc(10);
         }
 
-        puts("void " + topClassName() + "::trace(");
-        puts(v3Global.opt.traceClassBase() + "C* tfp, int, int) {\n");
-        puts("tfp->spTrace()->addInitCb(&" + protect("traceInit") + ", __VlSymsp);\n");
-        puts(protect("traceRegister") + "(tfp->spTrace());\n");
-        puts("}\n");
         puts("\n");
-        splitSizeInc(10);
+        m_lazyDecls.emit("void " + topClassName() + "__", protect("traceInitTop"),
+                         "(" + topClassName() + "* vlSelf, " + v3Global.opt.traceClassBase()
+                             + "* tracep);");
 
-        puts("void " + topClassName() + "::" + protect("traceInit") + "(void* userp, "
+        puts("\nstatic void " + protect("traceInit") + "(void* voidSelf, "
              + v3Global.opt.traceClassBase() + "* tracep, uint32_t code) {\n");
         putsDecoration("// Callback from tracep->open()\n");
-        puts(symClassVar() + " = static_cast<" + symClassName() + "*>(userp);\n");
-        puts("if (!vlSymsp->_vm_contextp__->calcUnusedSigs()) {\n");
+        puts(topClassName() + "*const __restrict vlSelf = static_cast<" + topClassName()
+             + "*>(voidSelf);\n");
+        puts("if (!vlSelf->vlSymsp->_vm_contextp__->calcUnusedSigs()) {\n");
         puts("VL_FATAL_MT(__FILE__, __LINE__, __FILE__,\n");
         puts("            \"Turning on wave traces requires Verilated::traceEverOn(true) call "
              "before time 0.\");\n");
         puts("}\n");
-        puts("vlSymsp->__Vm_baseCode = code;\n");
-        puts("tracep->module(vlSymsp->name());\n");
+        puts("vlSelf->vlSymsp->__Vm_baseCode = code;\n");
+        puts("tracep->module(vlSelf->vlSymsp->name());\n");
         puts("tracep->scopeEscape(' ');\n");
-        puts(topClassName() + "::" + protect("traceInitTop") + "(vlSymsp, tracep);\n");
+        puts(topClassName() + "__" + protect("traceInitTop") + "(vlSelf, tracep);\n");
         puts("tracep->scopeEscape('.');\n");  // Restore so later traced files won't break
         puts("}\n");
         splitSizeInc(10);
 
+        puts("\n");
+        m_lazyDecls.emit("void " + topClassName() + "__", protect("traceRegister"),
+                         "(" + topClassName() + "* vlSelf, " + v3Global.opt.traceClassBase()
+                             + "* tracep);");
+
+        puts("\nvoid " + topClassName() + "::trace(");
+        puts(v3Global.opt.traceClassBase() + "C* tfp, int, int) {\n");
+        puts("tfp->spTrace()->addInitCb(&" + protect("traceInit") + ", this);\n");
+        puts(topClassName() + "__" + protect("traceRegister") + "(this, tfp->spTrace());\n");
+        puts("}\n");
+        splitSizeInc(10);
+
         puts("\n//======================\n\n");
     }
 
@@ -3828,10 +3979,15 @@ class EmitCTrace final : EmitCStmts {
         // Top module only
         iterate(nodep->topModulep());
     }
-    virtual void visit(AstNodeModule* nodep) override { iterateChildren(nodep); }
+    virtual void visit(AstNodeModule* nodep) override {
+        m_modp = nodep;
+        iterateChildren(nodep);
+        m_modp = nullptr;
+    }
     virtual void visit(AstCFunc* nodep) override {
         if (nodep->slow() != m_slow) return;
         VL_RESTORER(m_cfuncp);
+        VL_RESTORER(m_useSelfForThis);
         if (nodep->funcType().isTrace()) {  // TRACE_*
             m_cfuncp = nodep;
 
@@ -3847,15 +4003,24 @@ class EmitCTrace final : EmitCStmts {
             splitSizeInc(nodep);
 
             puts("\n");
-            puts(nodep->rtnTypeVoid());
-            puts(" ");
-            puts(topClassName() + "::" + nodep->nameProtect() + "(" + cFuncArgs(nodep) + ") {\n");
+            m_lazyDecls.emit(nodep);
+            emitCFuncHeader(nodep, m_modp, /* withScope: */ true);
+            puts(" {\n");
 
-            if (nodep->funcType() != AstCFuncType::TRACE_REGISTER) {
-                puts(symClassVar() + " = static_cast<" + symClassName() + "*>(userp);\n");
+            if (nodep->isLoose()) {
+                m_lazyDecls.declared(nodep);  // Defined here, so no longer needs declaration
+                if (nodep->isStatic().falseUnknown()) {  // Standard prologue
+                    puts("if (false && vlSelf) {}  // Prevent unused\n");
+                    m_useSelfForThis = true;
+                    puts(symClassAssign());
+                }
             }
 
-            if (nodep->symProlog()) puts(symTopAssign() + "\n");
+            if (nodep->initsp()) {
+                string section;
+                emitVarList(nodep->initsp(), EVL_FUNC_ALL, "", section /*ref*/);
+                iterateAndNextNull(nodep->initsp());
+            }
 
             m_baseCode = -1;
 
@@ -3884,13 +4049,6 @@ class EmitCTrace final : EmitCStmts {
                 puts("if (false && tracep && c) {}  // Prevent unused\n");
             }
 
-            if (nodep->initsp()) {
-                string section;
-                putsDecoration("// Variables\n");
-                emitVarList(nodep->initsp(), EVL_FUNC_ALL, "", section /*ref*/);
-                iterateAndNextNull(nodep->initsp());
-            }
-
             if (nodep->stmtsp()) {
                 putsDecoration("// Body\n");
                 puts("{\n");
@@ -3930,7 +4088,8 @@ class EmitCTrace final : EmitCStmts {
 
 public:
     explicit EmitCTrace(bool slow)
-        : m_slow{slow} {}
+        : m_slow{slow}
+        , m_lazyDecls(*this) {}
     virtual ~EmitCTrace() override = default;
     void main() {
         // Put out the file
@@ -3947,8 +4106,20 @@ public:
 //######################################################################
 // EmitC class functions
 
+static void setParentClassPointers() {
+    // Set user4p in all CFunc and Var to point to the containing AstNodeModule
+    for (AstNode* modp = v3Global.rootp()->modulesp(); modp; modp = modp->nextp()) {
+        for (AstNode* nodep = VN_CAST(modp, NodeModule)->stmtsp(); nodep; nodep = nodep->nextp()) {
+            if (VN_IS(nodep, CFunc) || VN_IS(nodep, Var)) nodep->user4p(modp);
+        }
+    }
+}
+
 void V3EmitC::emitc() {
     UINFO(2, __FUNCTION__ << ": " << endl);
+    // Set user4 to parent module
+    AstUser4InUse user4InUse;
+    setParentClassPointers();
     // Process each module in turn
     for (AstNodeModule* nodep = v3Global.rootp()->modulesp(); nodep;
          nodep = VN_CAST(nodep->nextp(), NodeModule)) {
@@ -3968,6 +4139,9 @@ void V3EmitC::emitc() {
 void V3EmitC::emitcTrace() {
     UINFO(2, __FUNCTION__ << ": " << endl);
     if (v3Global.opt.trace()) {
+        // Set user4 to parent module
+        AstUser4InUse user4InUse;
+        setParentClassPointers();
         {
             EmitCTrace slow(true);
             slow.main();
diff --git a/src/V3EmitCBase.h b/src/V3EmitCBase.h
index 6b448916a..6a3d471c1 100644
--- a/src/V3EmitCBase.h
+++ b/src/V3EmitCBase.h
@@ -43,6 +43,7 @@ public:
         if (v3Global.opt.decoration()) puts(str);
     }
     void putsQuoted(const string& str) { ofp()->putsQuoted(str); }
+    void ensureNewLine() { ofp()->ensureNewLine(); }
     bool optSystemC() { return v3Global.opt.systemC(); }
     static string protect(const string& name) { return VIdProtect::protectIf(name, true); }
     static string protectIf(const string& name, bool doIt) {
@@ -54,22 +55,30 @@ public:
     static string ifNoProtect(const string& in) { return v3Global.opt.protectIds() ? "" : in; }
     static string symClassName() { return v3Global.opt.prefix() + "_" + protect("_Syms"); }
     static string symClassVar() { return symClassName() + "* __restrict vlSymsp"; }
-    static string symTopAssign() {
-        return v3Global.opt.prefix() + "* const __restrict vlTOPp VL_ATTR_UNUSED = vlSymsp->TOPp;";
+    static string symClassAssign() {
+        return symClassName() + "* const __restrict vlSymsp VL_ATTR_UNUSED = vlSelf->vlSymsp;\n";
     }
-    static string funcNameProtect(const AstCFunc* nodep, const AstNodeModule* modp) {
+    static string funcNameProtect(const AstCFunc* nodep) {
+        AstNodeModule* modp = VN_CAST(nodep->user4p(), NodeModule);
+        string name;
         if (nodep->isConstructor()) {
-            return prefixNameProtect(modp);
+            name += prefixNameProtect(modp);
         } else if (nodep->isDestructor()) {
-            return string("~") + prefixNameProtect(modp);
+            name += "~";
+            name += prefixNameProtect(modp);
         } else {
-            return nodep->nameProtect();
+            if (nodep->isLoose()) {
+                name += prefixNameProtect(modp);
+                name += "__";
+            }
+            name += nodep->nameProtect();
         }
+        return name;
     }
     static string prefixNameProtect(const AstNode* nodep) {  // C++ name with prefix
         const AstNodeModule* modp = VN_CAST_CONST(nodep, NodeModule);
         if (modp && modp->isTop()) {
-            return v3Global.opt.prefix();
+            return topClassName();
         } else {
             return v3Global.opt.modPrefix() + "_" + protect(nodep->name());
         }
@@ -86,7 +95,17 @@ public:
     }
     string cFuncArgs(const AstCFunc* nodep) {
         // Return argument list for given C function
-        string args = nodep->argTypes();
+        string args;
+        if (nodep->isLoose() && nodep->isStatic().falseUnknown()) {
+            if (nodep->isConst().trueKnown()) args += "const ";
+            AstNodeModule* modp = VN_CAST(nodep->user4p(), NodeModule);
+            args += prefixNameProtect(modp);
+            args += "* vlSelf";
+        }
+        if (!nodep->argTypes().empty()) {
+            if (!args.empty()) args += ", ";
+            args += nodep->argTypes();
+        }
         // Might be a user function with argument list.
         for (const AstNode* stmtp = nodep->argsp(); stmtp; stmtp = stmtp->nextp()) {
             if (const AstVar* portp = VN_CAST_CONST(stmtp, Var)) {
@@ -105,6 +124,31 @@ public:
         return args;
     }
 
+    void emitCFuncHeader(const AstCFunc* funcp, const AstNodeModule* modp, bool withScope) {
+        if (!funcp->isConstructor() && !funcp->isDestructor()) {
+            puts(funcp->rtnTypeVoid());
+            puts(" ");
+        }
+        if (withScope && funcp->isProperMethod()) puts(prefixNameProtect(modp) + "::");
+        puts(funcNameProtect(funcp));
+        puts("(" + cFuncArgs(funcp) + ")");
+        if (funcp->isConst().trueKnown() && funcp->isProperMethod()) puts(" const");
+    }
+
+    void emitCFuncDecl(const AstCFunc* funcp, const AstNodeModule* modp) {
+        ensureNewLine();
+        if (!funcp->ifdef().empty()) puts("#ifdef " + funcp->ifdef() + "\n");
+        if (funcp->isStatic().trueUnknown() && funcp->isProperMethod()) puts("static ");
+        if (funcp->isVirtual()) {
+            UASSERT_OBJ(funcp->isProperMethod(), funcp, "Virtual function is not a proper method");
+            puts("virtual ");
+        }
+        emitCFuncHeader(funcp, modp, /* withScope: */ false);
+        if (funcp->slow()) puts(" VL_ATTR_COLD");
+        puts(";\n");
+        if (!funcp->ifdef().empty()) puts("#endif  // " + funcp->ifdef() + "\n");
+    }
+
     // CONSTRUCTORS
     EmitCBaseVisitor() = default;
     virtual ~EmitCBaseVisitor() override = default;
diff --git a/src/V3EmitV.cpp b/src/V3EmitV.cpp
index a79cb32d4..648e7510c 100644
--- a/src/V3EmitV.cpp
+++ b/src/V3EmitV.cpp
@@ -624,9 +624,12 @@ class EmitVBaseVisitor VL_NOT_FINAL : public EmitCBaseVisitor {
         if (nodep->varScopep()) {
             putfs(nodep, nodep->varScopep()->prettyName());
         } else {
-            putfs(nodep, nodep->hiernameToUnprot());
-            puts(nodep->hiernameToProt());
-            puts(nodep->varp()->prettyName());
+            if (nodep->selfPointer().empty()) {
+                putfs(nodep, nodep->varp()->prettyName());
+            } else {
+                putfs(nodep, nodep->selfPointer() + "->");
+                puts(nodep->varp()->prettyName());
+            }
         }
     }
     virtual void visit(AstVarXRef* nodep) override {
diff --git a/src/V3File.cpp b/src/V3File.cpp
index 43c07ac17..2fcda4831 100644
--- a/src/V3File.cpp
+++ b/src/V3File.cpp
@@ -966,7 +966,7 @@ public:
     VIdProtectImp() {
         passthru("this");
         passthru("TOPp");
-        passthru("vlTOPp");
+        passthru("vlSelf");
         passthru("vlSymsp");
     }
     ~VIdProtectImp() = default;
@@ -1016,8 +1016,7 @@ public:
         }
     }
     string protectWordsIf(const string& old, bool doIt) {
-        // Split at " " (for traces), "." (for scopes), "->" (for scopes), "::" (for superclass
-        // reference)
+        // Split at " " (for traces), "." (for scopes), "->", "(", "&", ")" (for self pointers)
         if (!(doIt && v3Global.opt.protectIds())) return old;
         string out;
         string::size_type start = 0;
@@ -1029,7 +1028,9 @@ public:
             trySep(old, start, " ", pos /*ref*/, separator /*ref*/);
             trySep(old, start, ".", pos /*ref*/, separator /*ref*/);
             trySep(old, start, "->", pos /*ref*/, separator /*ref*/);
-            trySep(old, start, "::", pos /*ref*/, separator /*ref*/);
+            trySep(old, start, "(", pos /*ref*/, separator /*ref*/);
+            trySep(old, start, "&", pos /*ref*/, separator /*ref*/);
+            trySep(old, start, ")", pos /*ref*/, separator /*ref*/);
             if (pos == string::npos) break;
             out += protectIf(old.substr(start, pos - start), true) + separator;
             start = pos + separator.length();
diff --git a/src/V3File.h b/src/V3File.h
index 9d22a77b0..785a2d0c9 100644
--- a/src/V3File.h
+++ b/src/V3File.h
@@ -165,6 +165,9 @@ public:
     void blockDec() {
         if (!m_parenVec.empty()) m_parenVec.pop();
     }
+    void ensureNewLine() {
+        if (!m_nobreak) puts("\n");
+    }
     // STATIC METHODS
     static string indentSpaces(int num);
     // Add escaped characters to strings
diff --git a/src/V3Hasher.cpp b/src/V3Hasher.cpp
index 625e923a3..7562c0e16 100644
--- a/src/V3Hasher.cpp
+++ b/src/V3Hasher.cpp
@@ -199,7 +199,7 @@ private:
                 iterateNull(nodep->varScopep());
             } else {
                 iterateNull(nodep->varp());
-                m_hash += nodep->hiernameToProt();
+                m_hash += nodep->selfPointer();
             }
         });
     }
@@ -229,6 +229,11 @@ private:
             m_hash += nodep->text();
         });
     }
+    virtual void visit(AstAddrOfCFunc* nodep) override {
+        m_hash += hashNodeAndIterate(nodep, HASH_DTYPE, HASH_CHILDREN, [=]() {  //
+            iterateNull(nodep->funcp());
+        });
+    }
 
     //------------------------------------------------------------
     // AstNodeStmt
@@ -364,7 +369,9 @@ private:
         });
     }
     virtual void visit(AstCFunc* nodep) override {
-        m_hash += hashNodeAndIterate(nodep, HASH_DTYPE, HASH_CHILDREN, [=]() {});
+        m_hash += hashNodeAndIterate(nodep, HASH_DTYPE, HASH_CHILDREN, [=]() {  //
+            m_hash += nodep->isLoose();
+        });
     }
     virtual void visit(AstVar* nodep) override {
         m_hash += hashNodeAndIterate(nodep, HASH_DTYPE, HASH_CHILDREN, [=]() {
diff --git a/src/V3Localize.cpp b/src/V3Localize.cpp
index 42cf12d66..12e10f41a 100644
--- a/src/V3Localize.cpp
+++ b/src/V3Localize.cpp
@@ -76,8 +76,7 @@ private:
         // cppcheck-suppress unreadVariable  // cppcheck 1.90 bug
         VarFlags flags(nodep->varp());
         if (flags.m_done) {
-            nodep->hiernameToProt("");  // Remove this->
-            nodep->hiernameToUnprot("");  // Remove this->
+            nodep->selfPointer("");  // Remove 'this'
             nodep->hierThis(true);
         }
     }
diff --git a/src/V3Order.cpp b/src/V3Order.cpp
index 9baa69c7a..df9787a11 100644
--- a/src/V3Order.cpp
+++ b/src/V3Order.cpp
@@ -1754,14 +1754,13 @@ AstActive* OrderVisitor::processMoveOneLogic(const OrderLogicVertex* lvertexp,
             if (!newFuncpr && domainp != m_deleteDomainp) {
                 const string name = cfuncName(modp, domainp, scopep, nodep);
                 newFuncpr = new AstCFunc(nodep->fileline(), name, scopep);
-                newFuncpr->argTypes(EmitCBaseVisitor::symClassVar());
-                newFuncpr->symProlog(true);
+                newFuncpr->isStatic(false);
+                newFuncpr->isLoose(true);
                 newStmtsr = 0;
                 if (domainp->hasInitial() || domainp->hasSettle()) newFuncpr->slow(true);
                 scopep->addActivep(newFuncpr);
                 // Create top call to it
                 AstCCall* const callp = new AstCCall(nodep->fileline(), newFuncpr);
-                callp->argTypes("vlSymsp");
                 // Where will we be adding the call?
                 AstActive* const newActivep = new AstActive(nodep->fileline(), name, domainp);
                 newActivep->addStmtsp(callp);
diff --git a/src/V3String.cpp b/src/V3String.cpp
index 487643a4f..d69629394 100644
--- a/src/V3String.cpp
+++ b/src/V3String.cpp
@@ -157,6 +157,23 @@ double VString::parseDouble(const string& str, bool* successp) {
     return d;
 }
 
+static bool isWordChar(char c) { return isalnum(c) || c == '_'; }
+
+string VString::replaceWord(const string& str, const string& from, const string& to) {
+    string result = str;
+    const size_t len = from.size();
+    UASSERT_STATIC(len > 0, "Cannot replace empty string");
+    for (size_t pos = 0; (pos = result.find(from, pos)) != string::npos; pos += len) {
+        // Only replace whole words
+        if (((pos > 0) && isWordChar(result[pos - 1])) ||  //
+            ((pos + len < result.size()) && isWordChar(result[pos + len]))) {
+            continue;
+        }
+        result.replace(pos, len, to);
+    }
+    return result;
+}
+
 //######################################################################
 // VHashSha256
 
diff --git a/src/V3String.h b/src/V3String.h
index e151fd758..47c41e9ee 100644
--- a/src/V3String.h
+++ b/src/V3String.h
@@ -100,6 +100,10 @@ public:
     static bool isWhitespace(const string& str);
     // Return double by parsing string
     static double parseDouble(const string& str, bool* successp);
+    // Replace all occurrences of the word 'from' in 'str' with 'to'. A word is considered
+    // to be a consecutive sequence of the characters [a-zA-Z0-9_]. Sub-words are not replaced.
+    // e.g.: replaceWords("one apple bad_apple", "apple", "banana") -> "one banana bad_apple"
+    static string replaceWord(const string& str, const string& from, const string& to);
 };
 
 //######################################################################
diff --git a/src/V3Task.cpp b/src/V3Task.cpp
index 9dcfc0c04..99dc0a04c 100644
--- a/src/V3Task.cpp
+++ b/src/V3Task.cpp
@@ -854,10 +854,8 @@ private:
         {  // Call the user function
             // Add the variables referenced as VarRef's so that lifetime analysis
             // doesn't rip up the variables on us
-            string stmt;
-            stmt += "(*__Vcb)(";
             args += ");\n";
-            AstCStmt* newp = new AstCStmt(nodep->fileline(), stmt);
+            AstCStmt* newp = new AstCStmt(nodep->fileline(), "(*__Vcb)(");
             newp->addBodysp(argnodesp);
             VL_DANGLING(argnodesp);
             newp->addBodysp(new AstText(nodep->fileline(), args, true));
@@ -1131,7 +1129,7 @@ private:
         cfuncp->funcPublic(nodep->taskPublic());
         cfuncp->dpiExport(nodep->dpiExport());
         cfuncp->dpiImportWrapper(nodep->dpiImport());
-        cfuncp->isStatic(!(nodep->dpiImport() || nodep->taskPublic() || nodep->classMethod()));
+        cfuncp->isStatic(nodep->dpiExport());
         cfuncp->isVirtual(nodep->isVirtual());
         cfuncp->pure(nodep->pure());
         if (nodep->name() == "new") {
@@ -1145,21 +1143,12 @@ private:
         // cfuncp->dpiImport   // Not set in the wrapper - the called function has it set
         if (cfuncp->dpiExport()) cfuncp->cname(nodep->cname());
 
-        bool needSyms = !nodep->dpiImport();
-        if (needSyms) {
-            if (nodep->taskPublic()) {
-                // We need to get a pointer to all of our variables (may
-                // have eval'ed something else earlier)
-                cfuncp->addInitsp(new AstCStmt(nodep->fileline(), EmitCBaseVisitor::symClassVar()
-                                                                      + " = this->__VlSymsp;\n"));
-            } else {
-                // Need symbol table
-                cfuncp->argTypes(EmitCBaseVisitor::symClassVar());
-                if (cfuncp->name() == "new") {
-                    cfuncp->addInitsp(
-                        new AstCStmt(nodep->fileline(),
-                                     VIdProtect::protect("_ctor_var_reset") + "(vlSymsp);\n"));
-                }
+        if (!nodep->dpiImport() && !nodep->taskPublic()) {
+            // Need symbol table
+            cfuncp->argTypes(EmitCBaseVisitor::symClassVar());
+            if (cfuncp->name() == "new") {
+                const string stmt = VIdProtect::protect("_ctor_var_reset") + "(vlSymsp);\n";
+                cfuncp->addInitsp(new AstCStmt(nodep->fileline(), stmt));
             }
         }
         if (nodep->dpiContext()) {
@@ -1169,11 +1158,6 @@ private:
             createInputVar(cfuncp, "__Vlineno", AstBasicDTypeKwd::INT);
         }
 
-        if (!nodep->dpiImport()) {
-            cfuncp->addInitsp(
-                new AstCStmt(nodep->fileline(), EmitCBaseVisitor::symTopAssign() + "\n"));
-        }
-
         if (nodep->dpiExport()) {
             AstScopeName* snp = nodep->scopeNamep();
             UASSERT_OBJ(snp, nodep, "Missing scoping context");
diff --git a/src/V3Trace.cpp b/src/V3Trace.cpp
index 601c285e0..284add392 100644
--- a/src/V3Trace.cpp
+++ b/src/V3Trace.cpp
@@ -485,33 +485,43 @@ private:
         name += cvtToStr(funcNump++);
         FileLine* const flp = m_topScopep->fileline();
         AstCFunc* const funcp = new AstCFunc(flp, name, m_topScopep);
-        const string argTypes("void* userp, " + v3Global.opt.traceClassBase() + "* tracep");
-        funcp->argTypes(argTypes);
         funcp->funcType(type);
+        funcp->dontCombine(true);
+        const bool isTopFunc
+            = type == AstCFuncType::TRACE_FULL || type == AstCFuncType::TRACE_CHANGE;
+        if (isTopFunc) {
+            funcp->argTypes("void* voidSelf, " + v3Global.opt.traceClassBase() + "* tracep");
+            funcp->isStatic(true);
+            funcp->addInitsp(new AstCStmt(
+                flp, prefixNameProtect(m_topModp) + "* const __restrict vlSelf = static_cast<"
+                         + prefixNameProtect(m_topModp) + "*>(voidSelf);\n"));
+            funcp->addInitsp(new AstCStmt(flp, symClassAssign()));
+
+        } else {
+            funcp->argTypes(v3Global.opt.traceClassBase() + "* tracep");
+            funcp->isStatic(false);
+        }
+        funcp->isLoose(true);
         funcp->slow(type == AstCFuncType::TRACE_FULL || type == AstCFuncType::TRACE_FULL_SUB);
-        funcp->symProlog(true);
-        funcp->declPrivate(true);
         // Add it to top scope
         m_topScopep->addActivep(funcp);
         // Add call to new function
         if (callfromp) {
             AstCCall* callp = new AstCCall(funcp->fileline(), funcp);
-            callp->argTypes("userp, tracep");
+            callp->argTypes("tracep");
             callfromp->addStmtsp(callp);
         }
         // Register function
         if (regp) {
-            string registration = "tracep->add";
             if (type == AstCFuncType::TRACE_FULL) {
-                registration += "Full";
+                regp->addStmtsp(new AstText(flp, "tracep->addFullCb(", true));
             } else if (type == AstCFuncType::TRACE_CHANGE) {
-                registration += "Chg";
+                regp->addStmtsp(new AstText(flp, "tracep->addChgCb(", true));
             } else {
                 funcp->v3fatalSrc("Don't know how to register this type of function");
             }
-            registration += "Cb(&" + protect(name) + ", __VlSymsp);\n";
-            AstCStmt* const stmtp = new AstCStmt(flp, registration);
-            regp->addStmtsp(stmtp);
+            regp->addStmtsp(new AstAddrOfCFunc(flp, funcp));
+            regp->addStmtsp(new AstText(flp, ", vlSelf);\n", true));
         }
         // Add global activity check to TRACE_CHANGE functions
         if (type == AstCFuncType::TRACE_CHANGE) {
@@ -666,17 +676,22 @@ private:
     void createCleanupFunction(AstCFunc* regFuncp) {
         FileLine* const fl = m_topScopep->fileline();
         AstCFunc* const cleanupFuncp = new AstCFunc(fl, "traceCleanup", m_topScopep);
-        const string argTypes("void* userp, " + v3Global.opt.traceClassBase() + "* /*unused*/");
-        cleanupFuncp->argTypes(argTypes);
+        cleanupFuncp->argTypes("void* voidSelf, " + v3Global.opt.traceClassBase()
+                               + "* /*unused*/");
         cleanupFuncp->funcType(AstCFuncType::TRACE_CLEANUP);
         cleanupFuncp->slow(false);
-        cleanupFuncp->symProlog(true);
-        cleanupFuncp->declPrivate(true);
+        cleanupFuncp->isStatic(true);
+        cleanupFuncp->isLoose(true);
         m_topScopep->addActivep(cleanupFuncp);
+        cleanupFuncp->addInitsp(new AstCStmt(
+            fl, prefixNameProtect(m_topModp) + "* const __restrict vlSelf = static_cast<"
+                    + prefixNameProtect(m_topModp) + "*>(voidSelf);\n"));
+        cleanupFuncp->addInitsp(new AstCStmt(fl, symClassAssign()));
 
         // Register it
-        regFuncp->addStmtsp(new AstCStmt(
-            fl, string("tracep->addCleanupCb(&" + protect("traceCleanup") + ", __VlSymsp);\n")));
+        regFuncp->addStmtsp(new AstText(fl, "tracep->addCleanupCb(", true));
+        regFuncp->addStmtsp(new AstAddrOfCFunc(fl, cleanupFuncp));
+        regFuncp->addStmtsp(new AstText(fl, ", vlSelf);\n", true));
 
         // Clear global activity flag
         cleanupFuncp->addStmtsp(
@@ -726,7 +741,7 @@ private:
         regFuncp->funcType(AstCFuncType::TRACE_REGISTER);
         regFuncp->slow(true);
         regFuncp->isStatic(false);
-        regFuncp->declPrivate(true);
+        regFuncp->isLoose(true);
         m_topScopep->addActivep(regFuncp);
 
         const int parallelism = 1;  // Note: will bump this later, code below works for any value
diff --git a/src/V3TraceDecl.cpp b/src/V3TraceDecl.cpp
index ac7f9a7f0..05bc8f056 100644
--- a/src/V3TraceDecl.cpp
+++ b/src/V3TraceDecl.cpp
@@ -72,13 +72,13 @@ private:
     AstCFunc* newCFunc(AstCFuncType type, const string& name) {
         FileLine* const flp = m_topScopep->fileline();
         AstCFunc* const funcp = new AstCFunc(flp, name, m_topScopep);
-        string argTypes("void* userp, " + v3Global.opt.traceClassBase() + "* tracep");
+        string argTypes = v3Global.opt.traceClassBase() + "* tracep";
         if (m_interface) argTypes += ", int scopet, const char* scopep";
         funcp->argTypes(argTypes);
         funcp->funcType(type);
-        funcp->symProlog(true);
+        funcp->isStatic(false);
+        funcp->isLoose(true);
         funcp->slow(true);
-        funcp->declPrivate(true);
         m_topScopep->addActivep(funcp);
         UINFO(5, "  Newfunc " << funcp << endl);
         return funcp;
@@ -86,10 +86,10 @@ private:
     void callCFuncSub(AstCFunc* basep, AstCFunc* funcp, AstIntfRef* irp) {
         AstCCall* callp = new AstCCall(funcp->fileline(), funcp);
         if (irp) {
-            callp->argTypes("userp, tracep, VLT_TRACE_SCOPE_INTERFACE");
+            callp->argTypes("tracep, VLT_TRACE_SCOPE_INTERFACE");
             callp->addArgsp(irp->unlinkFrBack());
         } else {
-            callp->argTypes("userp, tracep");
+            callp->argTypes("tracep");
         }
         basep->addStmtsp(callp);
     }
diff --git a/test_regress/t/t_c_this.pl b/test_regress/t/t_c_this.pl
new file mode 100755
index 000000000..4260beacc
--- /dev/null
+++ b/test_regress/t/t_c_this.pl
@@ -0,0 +1,27 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2021 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(vlt => 1);
+
+compile();
+
+if ($Self->{vlt_all}) {
+    # The word 'this' (but only the whole word 'this' should have been replaced
+    # in the contents.
+    my $file = "$Self->{obj_dir}/$Self->{VM_PREFIX}.cpp";
+    my $text = file_contents($file);
+    error("$file has 'this->clk'") if ($text =~ m/\bthis->clk\b/);
+    error("$file does not have 'xthis'") if ($text !~ m/\bxthis\b/);
+    error("$file does not have 'thisx'") if ($text !~ m/\bthisx\b/);
+    error("$file does not have 'xthisx'") if ($text !~ m/\bxthisx\b/);
+}
+
+ok(1);
+1;
diff --git a/test_regress/t/t_c_this.v b/test_regress/t/t_c_this.v
new file mode 100644
index 000000000..95cd63eac
--- /dev/null
+++ b/test_regress/t/t_c_this.v
@@ -0,0 +1,15 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2021 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t (clk);
+   input clk;
+   always @(posedge clk) begin
+     $c("const CData xthis = this->clk;");
+     $c("const CData thisx = xthis;");
+     $c("const CData xthisx = thisx;");
+     $c("this->clk = xthisx;");
+   end
+endmodule
diff --git a/test_regress/t/t_class_extends_this_protect_ids.pl b/test_regress/t/t_class_extends_this_protect_ids.pl
new file mode 100755
index 000000000..47bee151d
--- /dev/null
+++ b/test_regress/t/t_class_extends_this_protect_ids.pl
@@ -0,0 +1,33 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2020 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(vlt_all => 1);
+
+# This test makes randomly named .cpp/.h files, which tend to collect, so remove them first
+foreach my $filename (glob ("$Self->{obj_dir}/*_PS*.cpp"
+                            ." $Self->{obj_dir}/*_PS*.h"
+                            ." $Self->{obj_dir}/*.d" )) {
+    print "rm $filename\n" if $Self->{verbose};
+    unlink $filename;
+}
+
+top_filename("t/t_class_extends_this.v");
+
+compile(
+    verilator_flags2 => ["--protect-ids",
+                         "--protect-key SECRET_KEY"]
+    );
+
+execute(
+    check_finished => 1,
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_cover_line.out b/test_regress/t/t_cover_line.out
index 579327102..da95bcf79 100644
--- a/test_regress/t/t_cover_line.out
+++ b/test_regress/t/t_cover_line.out
@@ -125,7 +125,7 @@
 	         end
 %000002	         else if (cyc==5) begin
 	`ifdef VERILATOR
-%000001	            $c("call_task();");
+%000001	            $c("this->call_task();");
 	`else
 	            call_task();
 	`endif
diff --git a/test_regress/t/t_cover_line.v b/test_regress/t/t_cover_line.v
index 580e31061..6b03de5e7 100644
--- a/test_regress/t/t_cover_line.v
+++ b/test_regress/t/t_cover_line.v
@@ -104,7 +104,7 @@ module t (/*AUTOARG*/
          end
          else if (cyc==5) begin
 `ifdef VERILATOR
-            $c("call_task();");
+            $c("this->call_task();");
 `else
             call_task();
 `endif
diff --git a/test_regress/t/t_debug_emitv.out b/test_regress/t/t_debug_emitv.out
index aeee81350..f42904c37 100644
--- a/test_regress/t/t_debug_emitv.out
+++ b/test_regress/t/t_debug_emitv.out
@@ -47,8 +47,6 @@ module Vt_debug_emitv;
     end
 
     ???? // CFUNC '_final_TOP'
-    $_CSTMT(Vt_debug_emitv* const __restrict vlTOPp VL_ATTR_UNUSED = vlSymsp->TOPp;
-    );
     $display("stmt");
     always @(posedge clk)@(negedge clk) begin
         $display("posedge clk");
@@ -238,14 +236,10 @@ class Vt_debug_emitv___024unit__03a__03aCls;
 signed int [31:0]  member;
 
 ???? // CFUNC '__VnoInFunc_method'
-$_CSTMT(Vt_debug_emitv* const __restrict vlTOPp VL_ATTR_UNUSED = vlSymsp->TOPp;
-);
 
 ???? // CFUNC 'new'
 $_CSTMT(_ctor_var_reset(vlSymsp);
 );
-$_CSTMT(Vt_debug_emitv* const __restrict vlTOPp VL_ATTR_UNUSED = vlSymsp->TOPp;
-);
 $unit::Cls.member = 32'sh1;
 endclass
 /*class*/package Vt_debug_emitv___024unit__03a__03aCls__Vclpkg;
diff --git a/test_regress/t/t_dpi_var.v b/test_regress/t/t_dpi_var.v
index 1ad0c1f3d..a5fc89111 100644
--- a/test_regress/t/t_dpi_var.v
+++ b/test_regress/t/t_dpi_var.v
@@ -88,7 +88,7 @@ module sub (/*AUTOARG*/
 
    initial begin
       // Test the naming
-      $c("mon_class_name(name());");
+      $c("mon_class_name(this->name());");
       mon_scope_name("%m");
       // Scheme A - pass pointer directly
       $c("mon_register_a(\"in\",&",in,",false);");
diff --git a/test_regress/t/t_extend.v b/test_regress/t/t_extend.v
index 689b7dd69..1ed24e25d 100644
--- a/test_regress/t/t_extend.v
+++ b/test_regress/t/t_extend.v
@@ -34,7 +34,7 @@ module t (/*AUTOARG*/
 `ifdef VERILATOR
 	 $c("VL_PRINTF(\"Calling $c, calling $c...\\n\");");
 	 $c("VL_PRINTF(\"Cyc=%d\\n\",",cyc,");");
-	 c_worked <= $c("my_function()");
+	 c_worked <= $c("this->my_function()");
 	 c_wider <= $c9("0x10");
 `else
 	 c_worked <= 1'b1;
diff --git a/test_regress/t/t_extend_class.v b/test_regress/t/t_extend_class.v
index 9eda467df..fb6d400c1 100644
--- a/test_regress/t/t_extend_class.v
+++ b/test_regress/t/t_extend_class.v
@@ -43,7 +43,7 @@ module t_extend_class_v (/*AUTOARG*/
 
    always @* begin
       // When "in" changes, call my method
-      out = $c("m_myobjp->my_math(",in,")");
+      out = $c("this->m_myobjp->my_math(",in,")");
    end
 
  `systemc_header
diff --git a/test_regress/t/t_flag_csplit.pl b/test_regress/t/t_flag_csplit.pl
index e31f96ab9..0f6336f60 100755
--- a/test_regress/t/t_flag_csplit.pl
+++ b/test_regress/t/t_flag_csplit.pl
@@ -96,6 +96,7 @@ sub check_cpp {
                 && $func !~ /::trace$/
                 && $func !~ /::traceInit$/
                 && $func !~ /::traceFull$/
+                && $func !~ /::final$/
                 ) {
                 push @funcs, $func;
             }
diff --git a/test_regress/t/t_flag_csplit_eval.pl b/test_regress/t/t_flag_csplit_eval.pl
index c2012b9f4..c7d8da543 100755
--- a/test_regress/t/t_flag_csplit_eval.pl
+++ b/test_regress/t/t_flag_csplit_eval.pl
@@ -15,7 +15,7 @@ sub check_evals {
         local $/; undef $/;
         my $wholefile = <$fh>;
 
-        if ($wholefile =~ /::_eval[0-9]+/) {
+        if ($wholefile =~ /___eval[0-9]+/) {
             ++$got;
         }
     }
diff --git a/test_regress/t/t_func_public.v b/test_regress/t/t_func_public.v
index c0d1e1e47..d97a93b34 100644
--- a/test_regress/t/t_func_public.v
+++ b/test_regress/t/t_func_public.v
@@ -16,7 +16,7 @@ module t (clk);
 	 cyc <= cyc + 1;
 	 if (cyc==1) begin
 `ifdef verilator
-	    $c("publicTop();");
+	    $c("this->publicTop();");
 `endif
 	 end
 	 if (cyc==20) begin
@@ -84,32 +84,32 @@ module tpub (
 	 //
 `ifdef VERILATOR_PUBLIC_TASKS
 	 if (cyc==11) begin
-	    $c("publicNoArgs();");
-	    $c("publicSetBool(true);");
-	    $c("publicSetLong(0x11bca);");
-	    $c("publicSetQuad(0x66655554444ULL);");
-	    $c("publicSetFlop(0x321);");
+	    $c("this->publicNoArgs();");
+	    $c("this->publicSetBool(true);");
+	    $c("this->publicSetLong(0x11bca);");
+	    $c("this->publicSetQuad(0x66655554444ULL);");
+	    $c("this->publicSetFlop(0x321);");
 	    //Unsupported: $c("WData w[3] = {0x12, 0x5678_9123, 0x1245_2352}; publicSetWide(w);");
 	 end
 	 if (cyc==12) begin
-	    $c("got_bool = publicGetSetBool(true);");
-	    $c("got_long = publicGetSetLong(0x11bca);");
-	    $c("got_quad = publicGetSetQuad(0xaaaabbbbccccULL);");
+	    $c("this->got_bool = this->publicGetSetBool(true);");
+	    $c("this->got_long = this->publicGetSetLong(0x11bca);");
+	    $c("this->got_quad = this->publicGetSetQuad(0xaaaabbbbccccULL);");
 	 end
 	 if (cyc==13) begin
-	    $c("{ bool gb; publicGetBool(gb); got_bool=gb; }");
+	    $c("{ bool gb; this->publicGetBool(gb); this->got_bool=gb; }");
 	    if (1'b1 != got_bool) $stop;
-	    $c("publicGetLong(got_long);");
+	    $c("this->publicGetLong(this->got_long);");
 	    if (24'h11bca != got_long) $stop;
-	    $c("{ vluint64_t qq; publicGetQuad(qq); got_quad=qq; }");
+	    $c("{ vluint64_t qq; this->publicGetQuad(qq); this->got_quad=qq; }");
 	    if (60'haaaa_bbbb_cccc != got_quad) $stop;
-	    $c("{ WData gw[3]; publicGetWide(gw); VL_ASSIGN_W(72,got_wide,gw); }");
+	    $c("{ WData gw[3]; this->publicGetWide(gw); VL_ASSIGN_W(72,this->got_wide,gw); }");
 	    if (72'hac_abca_aaaa_bbbb_1234 != got_wide) $stop;
 	    //Below doesn't work, because we're calling it inside the loop that sets var_flop
 	    // if (12'h321 != var_flop) $stop;
 	 end
 	 if (cyc==14) begin
-	    if ($c32("publicInstNum()") != i) $stop;
+	    if ($c32("this->publicInstNum()") != i) $stop;
 	 end
 `endif
       end
diff --git a/test_regress/t/t_func_rand.v b/test_regress/t/t_func_rand.v
index 8839b156b..a60f1fbd7 100644
--- a/test_regress/t/t_func_rand.v
+++ b/test_regress/t/t_func_rand.v
@@ -20,7 +20,7 @@ module t (clk, Rand);
       input [7:0]    idx;
       begin
 `ifdef verilator
-	 QxRand32 = $c ("QxRandTbl(",tbl,",",idx,")");
+	 QxRand32 = $c("this->QxRandTbl(",tbl,",",idx,")");
 `else
 	 QxRand32 = 32'hfeed0fad;
 `endif
diff --git a/test_regress/t/t_inst_tree_inl0_pub1.pl b/test_regress/t/t_inst_tree_inl0_pub1.pl
index 182cfc40e..3bf53b1f1 100755
--- a/test_regress/t/t_inst_tree_inl0_pub1.pl
+++ b/test_regress/t/t_inst_tree_inl0_pub1.pl
@@ -26,9 +26,7 @@ sub checkRelativeRefs {
     my $file = "$Self->{obj_dir}/V$Self->{name}_${mod}.cpp";
     my $text = file_contents($file);
 
-    # Remove "this->__VlSymsp" which is noise
-    $text =~ s/this->__VlSymsp//g;
-    if ($text =~ m/this->/) {
+    if ($text =~ m/this->/ || $text =~ m/vlSelf->/) {
         $found_relative = 1;
     }
 
@@ -45,12 +43,9 @@ if ($Self->{vlt_all}) {
     file_grep($Self->{stats}, qr/Optimizations, Combined CFuncs\s+(\d+)/i,
               ($Self->{vltmt} ? 84 : 52));
 
-    # Expect absolute refs in CFuncs for t (top module) and l1 (because it
-    # has only one instance)
-    checkRelativeRefs("t", 0);
-    checkRelativeRefs("l1", 0);
-
-    # Others should get relative references
+    # Everything should use relative references
+    checkRelativeRefs("t", 1);
+    checkRelativeRefs("l1", 1);
     checkRelativeRefs("l2", 1);
     checkRelativeRefs("l3", 1);
     checkRelativeRefs("l4", 1);
diff --git a/test_regress/t/t_inst_tree_inl0_pub1_norelcfuncs.pl b/test_regress/t/t_inst_tree_inl0_pub1_norelcfuncs.pl
index 0ec805e0e..27c1c82b3 100755
--- a/test_regress/t/t_inst_tree_inl0_pub1_norelcfuncs.pl
+++ b/test_regress/t/t_inst_tree_inl0_pub1_norelcfuncs.pl
@@ -24,13 +24,18 @@ if ($Self->{vlt_all}) {
     file_grep($Self->{stats}, qr/Optimizations, Combined CFuncs\s+(\d+)/i,
               ($Self->{vltmt} ? 0 : 31));
 
-    # Should not find any 'this->' except some 'this->__VlSymsp'
+    # Should not find any 'this->' or 'vlSelf->' except some specific cases
     my @files = `ls $Self->{obj_dir}/*.cpp`;
     foreach my $file (@files) {
         chomp $file;
         my $text = file_contents($file);
-        $text =~ s/this->__VlSymsp//g;
-        if ($text =~ m/this->/) {
+        $text =~ s/(vlSelf|this)->vlSymsp//g;
+        $text =~ s/vlSelf->.* = VL_RAND_RESET.*;//g;
+        $text =~ s/vlSelf->__Vm_even_cycle//g;
+        $text =~ s/vlSelf->__Vm_even_cycle//g;
+        $text =~ s/vlSelf->__Vm_mt_(final|\d+)//g;
+        $text =~ s/vlSelf->__Vm_threadPoolp//g;
+        if ($text =~ m/this->/ || $text =~ m/vlSelf->/) {
             error("$file has unexpected this-> refs when --norelative-cfuncs");
         }
     }
diff --git a/test_regress/t/t_param_public.v b/test_regress/t/t_param_public.v
index b896a596a..6c7bcdf14 100644
--- a/test_regress/t/t_param_public.v
+++ b/test_regress/t/t_param_public.v
@@ -27,7 +27,7 @@ module a;
    parameter ONE /*verilator public*/ = 22;
    initial if (ONE != 1) $stop;
 `ifdef VERILATOR
-   initial if ($c32("ONE") != 1) $stop;
+   initial if ($c32("this->ONE") != 1) $stop;
 `endif
 endmodule
 
@@ -36,7 +36,7 @@ module b #(
 	   );
    initial if (TWO != 2) $stop;
 `ifdef VERILATOR
-   initial if ($c32("TWO") != 2) $stop;
+   initial if ($c32("this->TWO") != 2) $stop;
 `endif
 endmodule
 
diff --git a/test_regress/t/t_protect_ids_key.out b/test_regress/t/t_protect_ids_key.out
index cfb58b841..0eeb97a9f 100644
--- a/test_regress/t/t_protect_ids_key.out
+++ b/test_regress/t/t_protect_ids_key.out
@@ -29,6 +29,7 @@
   <map from="PSABAY" to="_eval_initial"/>
   <map from="PSOLeN" to="_eval_initial_loop"/>
   <map from="PSBUJ6" to="_eval_settle"/>
+  <map from="PSAsei" to="_final"/>
   <map from="PSV5uq" to="_sequent__TOP__1"/>
   <map from="PS8sdG" to="_sequent__TOP__t__DOT__secret_inst__1"/>
   <map from="PScyq8" to="clk"/>
@@ -38,6 +39,6 @@
   <map from="PSBSVV" to="t/t_protect_ids.v"/>
   <map from="PSB07q" to="t__DOT__secret_inst2__DOT__secret_cyc"/>
   <map from="this" to="this"/>
+  <map from="vlSelf" to="vlSelf"/>
   <map from="vlSymsp" to="vlSymsp"/>
-  <map from="vlTOPp" to="vlTOPp"/>
 </verilator_id_map>
diff --git a/test_regress/t/t_unopt_converge_initial_run_bad.out b/test_regress/t/t_unopt_converge_initial_run_bad.out
index 56c0369a6..5445309d7 100644
--- a/test_regress/t/t_unopt_converge_initial_run_bad.out
+++ b/test_regress/t/t_unopt_converge_initial_run_bad.out
@@ -1,5 +1,5 @@
 -V{t#,#}- Verilated::debug is on. Message prefix indicates {<thread>,<sequence_number>}.
--V{t#,#}+    Vt_unopt_converge_initial_run_bad::_change_request
+-V{t#,#}+    Vt_unopt_converge_initial_run_bad___change_request
 -V{t#,#}        CHANGE: t/t_unopt_converge_initial.v:19: x
 %Error: t/t_unopt_converge_initial.v:7: Verilated model didn't DC converge
 Aborting...
diff --git a/test_regress/t/t_unopt_converge_print_bad.out b/test_regress/t/t_unopt_converge_print_bad.out
index 328c68219..0b271c309 100644
--- a/test_regress/t/t_unopt_converge_print_bad.out
+++ b/test_regress/t/t_unopt_converge_print_bad.out
@@ -1,5 +1,5 @@
 -V{t#,#}- Verilated::debug is on. Message prefix indicates {<thread>,<sequence_number>}.
--V{t#,#}+    Vt_unopt_converge_print_bad::_change_request
+-V{t#,#}+    Vt_unopt_converge_print_bad___change_request
 -V{t#,#}        CHANGE: t/t_unopt_converge.v:19: x
 %Error: t/t_unopt_converge.v:7: Verilated model didn't converge
 Aborting...
diff --git a/test_regress/t/t_unopt_converge_run_bad.out b/test_regress/t/t_unopt_converge_run_bad.out
index 6f057f8d1..362f65931 100644
--- a/test_regress/t/t_unopt_converge_run_bad.out
+++ b/test_regress/t/t_unopt_converge_run_bad.out
@@ -1,5 +1,5 @@
 -V{t#,#}- Verilated::debug is on. Message prefix indicates {<thread>,<sequence_number>}.
--V{t#,#}+    Vt_unopt_converge_run_bad::_change_request
+-V{t#,#}+    Vt_unopt_converge_run_bad___change_request
 -V{t#,#}        CHANGE: t/t_unopt_converge.v:19: x
 %Error: t/t_unopt_converge.v:7: Verilated model didn't converge
 Aborting...
diff --git a/test_regress/t/t_verilated_debug.out b/test_regress/t/t_verilated_debug.out
index 4dd67d22f..0768fa5a6 100644
--- a/test_regress/t/t_verilated_debug.out
+++ b/test_regress/t/t_verilated_debug.out
@@ -1,29 +1,30 @@
 -V{t#,#}- Verilated::debug is on. Message prefix indicates {<thread>,<sequence_number>}.
--V{t#,#}+    Vt_verilated_debug::_ctor_var_reset
+-V{t#,#}+    Vt_verilated_debug___ctor_var_reset
 internalsDump:
   Version: Verilator ###
   Argv: obj_vlt/t_verilated_debug/Vt_verilated_debug
   scopesDump:
 
--V{t#,#}+++++TOP Evaluate Vt_verilated_debug::eval
--V{t#,#}+    Vt_verilated_debug::_eval_debug_assertions
--V{t#,#}+    Vt_verilated_debug::_eval_initial
--V{t#,#}+    Vt_verilated_debug::_initial__TOP__1
+-V{t#,#}+++++TOP Evaluate Vt_verilated_debug::eval_step
+-V{t#,#}+    Vt_verilated_debug___eval_debug_assertions
+-V{t#,#}+    Vt_verilated_debug___eval_initial
+-V{t#,#}+    Vt_verilated_debug___initial__TOP__1
   Data: w96: 000000aa 000000bb 000000cc 
--V{t#,#}+    Vt_verilated_debug::_eval_settle
--V{t#,#}+    Vt_verilated_debug::_eval
--V{t#,#}+    Vt_verilated_debug::_change_request
--V{t#,#}+    Vt_verilated_debug::_change_request_1
+-V{t#,#}+ Initial loop
+-V{t#,#}+    Vt_verilated_debug___eval_settle
+-V{t#,#}+    Vt_verilated_debug___eval
+-V{t#,#}+    Vt_verilated_debug___change_request
+-V{t#,#}+    Vt_verilated_debug___change_request_1
 -V{t#,#}+ Clock loop
--V{t#,#}+    Vt_verilated_debug::_eval
--V{t#,#}+    Vt_verilated_debug::_change_request
--V{t#,#}+    Vt_verilated_debug::_change_request_1
--V{t#,#}+++++TOP Evaluate Vt_verilated_debug::eval
--V{t#,#}+    Vt_verilated_debug::_eval_debug_assertions
+-V{t#,#}+    Vt_verilated_debug___eval
+-V{t#,#}+    Vt_verilated_debug___change_request
+-V{t#,#}+    Vt_verilated_debug___change_request_1
+-V{t#,#}+++++TOP Evaluate Vt_verilated_debug::eval_step
+-V{t#,#}+    Vt_verilated_debug___eval_debug_assertions
 -V{t#,#}+ Clock loop
--V{t#,#}+    Vt_verilated_debug::_eval
--V{t#,#}+    Vt_verilated_debug::_sequent__TOP__2
+-V{t#,#}+    Vt_verilated_debug___eval
+-V{t#,#}+    Vt_verilated_debug___sequent__TOP__2
 *-* All Finished *-*
--V{t#,#}+    Vt_verilated_debug::_change_request
--V{t#,#}+    Vt_verilated_debug::_change_request_1
--V{t#,#}+    Vt_verilated_debug::final
+-V{t#,#}+    Vt_verilated_debug___change_request
+-V{t#,#}+    Vt_verilated_debug___change_request_1
+-V{t#,#}+    Vt_verilated_debug___final

From c207e98306cba860b1b7c9728012940db936a0a2 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sun, 13 Jun 2021 15:05:55 +0100
Subject: [PATCH 10/73] Implement a distinct constant pool (#3013)

What previously used to be per module static constants created in
V3Table and V3Prelim are now merged globally within the whole model and
emitted as part of a separate constant pool. Members of the constant
pool are global variables which are declared lazily when used (similar to
loose methods).
---
 Changes                                       |   2 +
 bin/verilator                                 |   1 +
 docs/guide/exe_verilator.rst                  |   7 +
 include/verilated_heavy.h                     |  42 +-
 src/Makefile_obj.in                           |   1 +
 src/V3AstNodes.cpp                            | 126 +++++-
 src/V3AstNodes.h                              |  44 +-
 src/V3EmitC.cpp                               |  27 +-
 src/V3EmitC.h                                 |   1 +
 src/V3EmitCBase.h                             |   5 +
 src/V3EmitCConstPool.cpp                      | 194 ++++++++
 src/V3EmitCSyms.cpp                           |   1 +
 src/V3EmitXml.cpp                             |   2 +
 src/V3Global.cpp                              |   6 +-
 src/V3Hash.h                                  |   2 +-
 src/V3Hasher.cpp                              |  12 +-
 src/V3LinkCells.cpp                           |   1 +
 src/V3LinkDot.cpp                             |   4 +
 src/V3Options.cpp                             |   1 +
 src/V3Options.h                               |   2 +
 src/V3Premit.cpp                              |  79 ++--
 src/V3String.h                                |  11 +-
 src/V3Table.cpp                               | 417 ++++++++----------
 src/Verilator.cpp                             |   3 +-
 test_regress/t/t_extract_static_const.pl      |   9 +-
 test_regress/t/t_extract_static_const.v       |  34 +-
 .../t/t_extract_static_const_multimodule.pl   |  11 +-
 .../t/t_extract_static_const_no_merge.pl      |  33 ++
 test_regress/t/t_opt_table_enum.out           |   9 +
 test_regress/t/t_opt_table_enum.pl            |  28 ++
 test_regress/t/t_opt_table_enum.v             |  45 ++
 test_regress/t/t_opt_table_packed_array.out   |   9 +
 test_regress/t/t_opt_table_packed_array.pl    |  28 ++
 test_regress/t/t_opt_table_packed_array.v     |  38 ++
 test_regress/t/t_opt_table_same.out           |   9 +
 test_regress/t/t_opt_table_same.pl            |  28 ++
 test_regress/t/t_opt_table_same.v             |  51 +++
 test_regress/t/t_opt_table_signed.out         |   9 +
 test_regress/t/t_opt_table_signed.pl          |  28 ++
 test_regress/t/t_opt_table_signed.v           |  38 ++
 test_regress/t/t_opt_table_sparse.out         |   9 +
 test_regress/t/t_opt_table_sparse.pl          |  28 ++
 test_regress/t/t_opt_table_sparse.v           |  40 ++
 .../t/t_opt_table_sparse_output_split.pl      |  47 ++
 test_regress/t/t_opt_table_string.out         |   9 +
 test_regress/t/t_opt_table_string.pl          |  28 ++
 test_regress/t/t_opt_table_string.v           |  37 ++
 test_regress/t/t_opt_table_struct.out         |   9 +
 test_regress/t/t_opt_table_struct.pl          |  28 ++
 test_regress/t/t_opt_table_struct.v           |  42 ++
 50 files changed, 1331 insertions(+), 344 deletions(-)
 create mode 100644 src/V3EmitCConstPool.cpp
 create mode 100755 test_regress/t/t_extract_static_const_no_merge.pl
 create mode 100644 test_regress/t/t_opt_table_enum.out
 create mode 100755 test_regress/t/t_opt_table_enum.pl
 create mode 100644 test_regress/t/t_opt_table_enum.v
 create mode 100644 test_regress/t/t_opt_table_packed_array.out
 create mode 100755 test_regress/t/t_opt_table_packed_array.pl
 create mode 100644 test_regress/t/t_opt_table_packed_array.v
 create mode 100644 test_regress/t/t_opt_table_same.out
 create mode 100755 test_regress/t/t_opt_table_same.pl
 create mode 100644 test_regress/t/t_opt_table_same.v
 create mode 100644 test_regress/t/t_opt_table_signed.out
 create mode 100755 test_regress/t/t_opt_table_signed.pl
 create mode 100644 test_regress/t/t_opt_table_signed.v
 create mode 100644 test_regress/t/t_opt_table_sparse.out
 create mode 100755 test_regress/t/t_opt_table_sparse.pl
 create mode 100644 test_regress/t/t_opt_table_sparse.v
 create mode 100755 test_regress/t/t_opt_table_sparse_output_split.pl
 create mode 100644 test_regress/t/t_opt_table_string.out
 create mode 100755 test_regress/t/t_opt_table_string.pl
 create mode 100644 test_regress/t/t_opt_table_string.v
 create mode 100644 test_regress/t/t_opt_table_struct.out
 create mode 100755 test_regress/t/t_opt_table_struct.pl
 create mode 100644 test_regress/t/t_opt_table_struct.v

diff --git a/Changes b/Changes
index e9cb910f9..d1b63d9dc 100644
--- a/Changes
+++ b/Changes
@@ -18,6 +18,8 @@ Verilator 4.205 devel
 
 **Minor:**
 
+* Merge const static data globally into a new constant pool (#3013). [Geza Lore]
+
 
 
 Verilator 4.204 2021-06-12
diff --git a/bin/verilator b/bin/verilator
index 61064a9b4..0b5f4b636 100755
--- a/bin/verilator
+++ b/bin/verilator
@@ -344,6 +344,7 @@ detailed descriptions of these arguments.
     --MMD                       Create .d dependency files
     --MP                        Create phony dependency targets
     --Mdir <directory>          Name of output object directory
+    --no-merge-const-pool       Disable merging of different types in const pool
     --mod-prefix <topname>      Name to prepend to lower classes
     --no-clk <signal-name>      Prevent marking specified signal as clock
     --no-decoration             Disable comments and symbol decorations
diff --git a/docs/guide/exe_verilator.rst b/docs/guide/exe_verilator.rst
index d7eebe90d..0fa6c7ab5 100644
--- a/docs/guide/exe_verilator.rst
+++ b/docs/guide/exe_verilator.rst
@@ -633,6 +633,13 @@ Summary:
    The directory is created if it does not exist and the parent directories
    exist; otherwise manually create the Mdir before calling Verilator.
 
+.. option:: --no-merge-const-pool
+
+   Rarely needed.  In order to minimize cache footprint, values of different
+   data type, that are yet emitted identically in C++ are merged in the
+   constant pool.  This option disables this and causes every constant pool
+   entry with a distinct data type to be emitted separately.
+
 .. option:: --mod-prefix <topname>
 
    Specifies the name to prepend to all lower level classes.  Defaults to
diff --git a/include/verilated_heavy.h b/include/verilated_heavy.h
index 95622b4ad..c0b1d9938 100644
--- a/include/verilated_heavy.h
+++ b/include/verilated_heavy.h
@@ -89,19 +89,24 @@ public:
 };
 
 //===================================================================
-/// Verilog wide unpacked bit container.
+/// Verilog wide packed bit container.
 /// Similar to std::array<WData, N>, but lighter weight, only methods needed
 /// by Verilator, to help compile time.
 ///
+/// A 'struct' as we want this to be an aggregate type that allows
+/// static aggregate initialization. Consider data members private.
+///
 /// For example a Verilog "bit [94:0]" will become a VlWide<3> because 3*32
 /// bits are needed to hold the 95 bits. The MSB (bit 96) must always be
 /// zero in memory, but during intermediate operations in the Verilated
 /// internals is unpredictable.
 
-template <std::size_t T_Words> class VlWide final {
-    EData m_storage[T_Words];
+template <std::size_t T_Words> struct VlWide final {
+    // MEMBERS
+    // This should be the only data member, otherwise generated static initializers need updating
+    EData m_storage[T_Words];  // Contents of the packed array
 
-public:
+    // CONSTRUCTORS
     // cppcheck-suppress uninitVar
     VlWide() = default;
     ~VlWide() = default;
@@ -798,26 +803,21 @@ void VL_WRITEMEM_N(bool hex, int bits, const std::string& filename,
 }
 
 //===================================================================
-/// Verilog packed array container
+/// Verilog unpacked array container
 /// For when a standard C++[] array is not sufficient, e.g. an
 /// array under a queue, or methods operating on the array.
 ///
+/// A 'struct' as we want this to be an aggregate type that allows
+/// static aggregate initialization. Consider data members private.
+///
 /// This class may get exposed to a Verilated Model's top I/O, if the top
 /// IO has an unpacked array.
 
-template <class T_Value, std::size_t T_Depth> class VlUnpacked final {
-private:
-    // TYPES
-    using Array = std::array<T_Value, T_Depth>;
-
-public:
-    using const_iterator = typename Array::const_iterator;
-
-private:
+template <class T_Value, std::size_t T_Depth> struct VlUnpacked final {
     // MEMBERS
-    Array m_array;  // Contents of the packed array
+    // This should be the only data member, otherwise generated static initializers need updating
+    T_Value m_storage[T_Depth];  // Contents of the unpacked array
 
-public:
     // CONSTRUCTORS
     VlUnpacked() = default;
     ~VlUnpacked() = default;
@@ -828,18 +828,18 @@ public:
 
     // METHODS
     // Raw access
-    WData* data() { return &m_array[0]; }
-    const WData* data() const { return &m_array[0]; }
+    WData* data() { return &m_storage[0]; }
+    const WData* data() const { return &m_storage[0]; }
 
-    T_Value& operator[](size_t index) { return m_array[index]; };
-    const T_Value& operator[](size_t index) const { return m_array[index]; };
+    T_Value& operator[](size_t index) { return m_storage[index]; };
+    const T_Value& operator[](size_t index) const { return m_storage[index]; };
 
     // Dumping. Verilog: str = $sformatf("%p", assoc)
     std::string to_string() const {
         std::string out = "'{";
         std::string comma;
         for (int i = 0; i < T_Depth; ++i) {
-            out += comma + VL_TO_STRING(m_array[i]);
+            out += comma + VL_TO_STRING(m_storage[i]);
             comma = ", ";
         }
         return out + "} ";
diff --git a/src/Makefile_obj.in b/src/Makefile_obj.in
index 5fc473131..9618840c6 100644
--- a/src/Makefile_obj.in
+++ b/src/Makefile_obj.in
@@ -180,6 +180,7 @@ RAW_OBJS = \
 	V3Descope.o \
 	V3DupFinder.o \
 	V3EmitC.o \
+	V3EmitCConstPool.o \
 	V3EmitCInlines.o \
 	V3EmitCSyms.o \
 	V3EmitCMake.o \
diff --git a/src/V3AstNodes.cpp b/src/V3AstNodes.cpp
index f8e0c1d79..22bfd5a85 100644
--- a/src/V3AstNodes.cpp
+++ b/src/V3AstNodes.cpp
@@ -18,16 +18,18 @@
 #include "verilatedos.h"
 
 #include "V3Ast.h"
+#include "V3EmitCBase.h"
 #include "V3File.h"
 #include "V3Global.h"
 #include "V3Graph.h"
+#include "V3Hasher.h"
 #include "V3PartitionGraph.h"  // Just for mtask dumping
 #include "V3String.h"
-#include "V3EmitCBase.h"
 
 #include "V3AstNodes__gen_macros.h"  // Generated by 'astgen'
 
 #include <iomanip>
+#include <iterator>
 #include <vector>
 
 //======================================================================
@@ -295,6 +297,14 @@ AstConst* AstConst::parseParamLiteral(FileLine* fl, const string& literal) {
     return nullptr;
 }
 
+AstNetlist::AstNetlist()
+    : ASTGEN_SUPER_Netlist(new FileLine(FileLine::builtInFilename()))
+    , m_typeTablep{new AstTypeTable(fileline())}
+    , m_constPoolp{new AstConstPool(fileline())} {
+    addMiscsp(m_typeTablep);
+    addMiscsp(m_constPoolp);
+}
+
 void AstNetlist::timeprecisionMerge(FileLine*, const VTimescale& value) {
     VTimescale prec = v3Global.opt.timeComputePrec(value);
     if (prec.isNone() || prec == m_timeprecision) {
@@ -899,6 +909,11 @@ bool AstSenTree::hasCombo() const {
     return false;
 }
 
+AstTypeTable::AstTypeTable(FileLine* fl)
+    : ASTGEN_SUPER_TypeTable(fl) {
+    for (int i = 0; i < AstBasicDTypeKwd::_ENUM_MAX; ++i) m_basicps[i] = nullptr;
+}
+
 void AstTypeTable::clearCache() {
     // When we mass-change widthMin in V3WidthCommit, we need to correct the table.
     // Just clear out the maps; the search functions will be used to rebuild the map
@@ -993,6 +1008,115 @@ AstBasicDType* AstTypeTable::findInsertSameDType(AstBasicDType* nodep) {
     return nodep;
 }
 
+AstConstPool::AstConstPool(FileLine* fl)
+    : ASTGEN_SUPER_ConstPool(fl)
+    , m_modp{new AstModule(fl, "@CONST-POOL@")}
+    , m_scopep{new AstScope(fl, m_modp, "@CONST-POOL@", nullptr, nullptr)} {
+    addOp1p(m_modp);
+    m_modp->addStmtp(m_scopep);
+}
+
+AstVarScope* AstConstPool::createNewEntry(const string& name, AstNode* initp) {
+    FileLine* const fl = initp->fileline();
+    AstVar* const varp = new AstVar(fl, AstVarType::MODULETEMP, name, initp->dtypep());
+    varp->isConst(true);
+    varp->isStatic(true);
+    varp->valuep(initp->cloneTree(false));
+    m_modp->addStmtp(varp);
+    AstVarScope* const varScopep = new AstVarScope(fl, m_scopep, varp);
+    m_scopep->addVarp(varScopep);
+    return varScopep;
+}
+
+static bool sameInit(const AstInitArray* ap, const AstInitArray* bp) {
+    // Unpacked array initializers must have equivalent values
+    // Note, sadly we can't just call ap->sameTree(pb), because both:
+    // - the dtypes might be different instances
+    // - the default/inititem children might be in different order yet still yield the same table
+    // See note in AstInitArray::same about the same. This function instead compares by initializer
+    // value, rather than by tree structure.
+    const AstUnpackArrayDType* const aDTypep = VN_CAST(ap->dtypep(), UnpackArrayDType);
+    const AstUnpackArrayDType* const bDTypep = VN_CAST(bp->dtypep(), UnpackArrayDType);
+    UASSERT_STATIC(aDTypep, "Bad type in array initializer");
+    UASSERT_STATIC(bDTypep, "Bad type in array initializer");
+    if (!aDTypep->subDTypep()->sameTree(bDTypep->subDTypep())) {  // Element types differ
+        return false;
+    }
+    if (!aDTypep->rangep()->sameTree(bDTypep->rangep())) {  // Ranges differ
+        return false;
+    }
+    // Compare initializer arrays by value. Note this is only called when they hash the same,
+    // so they likely run at most once per call to 'AstConstPool::findTable'.
+    const uint32_t size = aDTypep->elementsConst();
+    for (uint32_t n = 0; n < size; ++n) {
+        const AstNode* const valAp = ap->getIndexDefaultedValuep(n);
+        const AstNode* const valBp = bp->getIndexDefaultedValuep(n);
+        if (!valAp->sameTree(valBp)) { return false; }
+    }
+    return true;
+}
+
+AstVarScope* AstConstPool::findTable(AstInitArray* initp) {
+    AstNode* const defaultp = initp->defaultp();
+    // Verify initializer is well formed
+    UASSERT_OBJ(VN_IS(initp->dtypep(), UnpackArrayDType), initp,
+                "Const pool table must have AstUnpackArrayDType dtype");
+    UASSERT_OBJ(!defaultp || VN_IS(defaultp, Const), initp,
+                "Const pool table default must be Const");
+    for (AstNode* nodep = initp->initsp(); nodep; nodep = nodep->nextp()) {
+        AstNode* const valuep = VN_CAST(nodep, InitItem)->valuep();
+        UASSERT_OBJ(VN_IS(valuep, Const), valuep, "Const pool table entry must be Const");
+    }
+    // Try to find an existing table with the same content
+    const uint32_t hash = V3Hasher::uncachedHash(initp).value();
+    const auto& er = m_tables.equal_range(hash);
+    for (auto it = er.first; it != er.second; ++it) {
+        AstVarScope* const varScopep = it->second;
+        const AstInitArray* const init2p = VN_CAST(varScopep->varp()->valuep(), InitArray);
+        if (sameInit(initp, init2p)) {
+            return varScopep;  // Found identical table
+        }
+    }
+    // No such table yet, create it.
+    string name = "TABLE_";
+    name += cvtToHex(hash);
+    name += "_";
+    name += cvtToStr(std::distance(er.first, er.second));
+    AstVarScope* const varScopep = createNewEntry(name, initp);
+    m_tables.emplace(hash, varScopep);
+    return varScopep;
+}
+
+static bool sameInit(const AstConst* ap, const AstConst* bp) {
+    // Similarly to the AstInitArray comparison, we ignore the dtype instance, so long as they
+    // are compatible. For now, we assume the dtype is not relevant, as we only call this from
+    // V3Prelim which is a late pass.
+    // Compare initializers by value. This checks widths as well.
+    return ap->num().isCaseEq(bp->num());
+}
+
+AstVarScope* AstConstPool::findConst(AstConst* initp, bool mergeDType) {
+    // Try to find an existing constant with the same value
+    const uint32_t hash = initp->num().toHash().value();
+    const auto& er = m_consts.equal_range(hash);
+    for (auto it = er.first; it != er.second; ++it) {
+        AstVarScope* const varScopep = it->second;
+        const AstConst* const init2p = VN_CAST(varScopep->varp()->valuep(), Const);
+        if (sameInit(initp, init2p)
+            && (mergeDType || varScopep->dtypep()->sameTree(initp->dtypep()))) {
+            return varScopep;  // Found identical constant
+        }
+    }
+    // No such constant yet, create it.
+    string name = "CONST_";
+    name += cvtToHex(hash);
+    name += "_";
+    name += cvtToStr(std::distance(er.first, er.second));
+    AstVarScope* const varScopep = createNewEntry(name, initp);
+    m_consts.emplace(hash, varScopep);
+    return varScopep;
+}
+
 //======================================================================
 // Special walking tree inserters
 
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index 39b7d74b4..2ee8a64db 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -9082,10 +9082,7 @@ class AstTypeTable final : public AstNode {
     DetailedMap m_detailedMap;
 
 public:
-    explicit AstTypeTable(FileLine* fl)
-        : ASTGEN_SUPER_TypeTable(fl) {
-        for (int i = 0; i < AstBasicDTypeKwd::_ENUM_MAX; ++i) m_basicps[i] = nullptr;
-    }
+    explicit AstTypeTable(FileLine* fl);
     ASTNODE_NODE_FUNCS(TypeTable)
     AstNodeDType* typesp() const { return VN_CAST(op1p(), NodeDType); }  // op1 = List of dtypes
     void addTypesp(AstNodeDType* nodep) { addOp1p(nodep); }
@@ -9102,6 +9099,34 @@ public:
     virtual void dump(std::ostream& str = std::cout) const override;
 };
 
+class AstConstPool final : public AstNode {
+    // Container for const static data
+    std::unordered_multimap<uint32_t, AstVarScope*> m_tables;  // Constant tables (unpacked arrays)
+    std::unordered_multimap<uint32_t, AstVarScope*> m_consts;  // Constant tables (scalars)
+    AstModule* const m_modp;  // The Module holding the Scope below ...
+    AstScope* const m_scopep;  // Scope holding the constant variables
+
+    AstVarScope* createNewEntry(const string& name, AstNode* initp);
+
+public:
+    explicit AstConstPool(FileLine* fl);
+    ASTNODE_NODE_FUNCS(ConstPool)
+    AstModule* modp() const { return m_modp; }
+
+    // Find a table (unpacked array) within the constant pool which is initialized with the
+    // given value, or create one if one does not already exists. The returned VarScope *might*
+    // have a different dtype than the given initp->dtypep(), including a different element type,
+    // but it will always have the same size and element width. In contexts where this matters,
+    // the caller must handle the dtype difference as appropriate.
+    AstVarScope* findTable(AstInitArray* initp);
+    // Find a constant within the constant pool which is initialized with the given value, or
+    // create one if one does not already exists. If 'mergeDType' is true, then the returned
+    // VarScope *might* have a different type than the given initp->dtypep(). In contexts where
+    // this matters, the caller must handle the dtype difference as appropriate. If 'mergeDType' is
+    // false, the returned VarScope will have _->dtypep()->sameTree(initp->dtypep()) return true.
+    AstVarScope* findConst(AstConst* initp, bool mergeDType);
+};
+
 //######################################################################
 // Top
 
@@ -9110,7 +9135,8 @@ class AstNetlist final : public AstNode {
     // Parents:   none
     // Children:  MODULEs & CFILEs
 private:
-    AstTypeTable* m_typeTablep = nullptr;  // Reference to top type table, for faster lookup
+    AstTypeTable* const m_typeTablep;  // Reference to top type table, for faster lookup
+    AstConstPool* const m_constPoolp;  // Reference to constant pool, for faster lookup
     AstPackage* m_dollarUnitPkgp = nullptr;  // $unit
     AstCFunc* m_evalp = nullptr;  // The '_eval' function
     AstExecGraph* m_execGraphp = nullptr;  // Execution MTask graph for threads>1 mode
@@ -9118,8 +9144,7 @@ private:
     VTimescale m_timeprecision;  // Global time precision
     bool m_timescaleSpecified = false;  // Input HDL specified timescale
 public:
-    AstNetlist()
-        : ASTGEN_SUPER_Netlist(new FileLine(FileLine::builtInFilename())) {}
+    AstNetlist();
     ASTNODE_NODE_FUNCS(Netlist)
     virtual const char* broken() const override {
         BROKEN_RTN(m_dollarUnitPkgp && !m_dollarUnitPkgp->brokeExists());
@@ -9140,10 +9165,7 @@ public:
     AstNode* miscsp() const { return op3p(); }  // op3 = List of dtypes etc
     void addMiscsp(AstNode* nodep) { addOp3p(nodep); }
     AstTypeTable* typeTablep() { return m_typeTablep; }
-    void addTypeTablep(AstTypeTable* nodep) {
-        m_typeTablep = nodep;
-        addMiscsp(nodep);
-    }
+    AstConstPool* constPoolp() { return m_constPoolp; }
     AstPackage* dollarUnitPkgp() const { return m_dollarUnitPkgp; }
     AstPackage* dollarUnitPkgAddp() {
         if (!m_dollarUnitPkgp) {
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 7f5b11006..7bfe41fe9 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -1131,7 +1131,10 @@ public:
     // Terminals
     virtual void visit(AstVarRef* nodep) override {
         const AstVar* const varp = nodep->varp();
-        if (varp->isStatic()) {
+        if (isConstPoolMod(varp->user4p())) {
+            // Reference to constant pool variable
+            puts(topClassName() + "__ConstPool__");
+        } else if (varp->isStatic()) {
             // Access static variable via the containing class
             puts(prefixNameProtect(varp->user4p()) + "::");
         } else if (!nodep->classPrefix().empty()) {
@@ -1399,6 +1402,16 @@ class EmitCLazyDecls final : public AstNVisitor {
         m_needsBlankLine = true;
     }
 
+    void lazyDeclareConstPoolVar(AstVar* varp) {
+        if (varp->user2SetOnce()) return;  // Already declared
+        const string nameProtect
+            = m_emitter.topClassName() + "__ConstPool__" + varp->nameProtect();
+        m_emitter.puts("extern const ");
+        m_emitter.puts(varp->dtypep()->cType(nameProtect, false, false));
+        m_emitter.puts(";\n");
+        m_needsBlankLine = true;
+    }
+
     virtual void visit(AstNodeCCall* nodep) override {
         lazyDeclare(nodep->funcp());
         iterateChildren(nodep);
@@ -1420,6 +1433,12 @@ class EmitCLazyDecls final : public AstNVisitor {
         }
     }
 
+    virtual void visit(AstVarRef* nodep) override {
+        AstVar* const varp = nodep->varp();
+        // Only constant pool symbols are lazy declared for now ...
+        if (EmitCBaseVisitor::isConstPoolMod(varp->user4p())) { lazyDeclareConstPoolVar(varp); }
+    }
+
     virtual void visit(AstNode* nodep) override { iterateChildrenConst(nodep); }
 
     VL_DEBUG_FUNC;
@@ -4108,11 +4127,15 @@ public:
 
 static void setParentClassPointers() {
     // Set user4p in all CFunc and Var to point to the containing AstNodeModule
-    for (AstNode* modp = v3Global.rootp()->modulesp(); modp; modp = modp->nextp()) {
+    auto setAll = [](AstNodeModule* modp) -> void {
         for (AstNode* nodep = VN_CAST(modp, NodeModule)->stmtsp(); nodep; nodep = nodep->nextp()) {
             if (VN_IS(nodep, CFunc) || VN_IS(nodep, Var)) nodep->user4p(modp);
         }
+    };
+    for (AstNode* modp = v3Global.rootp()->modulesp(); modp; modp = modp->nextp()) {
+        setAll(VN_CAST(modp, NodeModule));
     }
+    setAll(v3Global.rootp()->constPoolp()->modp());
 }
 
 void V3EmitC::emitc() {
diff --git a/src/V3EmitC.h b/src/V3EmitC.h
index 0e4207c6a..d5c053a9f 100644
--- a/src/V3EmitC.h
+++ b/src/V3EmitC.h
@@ -28,6 +28,7 @@
 class V3EmitC final {
 public:
     static void emitc();
+    static void emitcConstPool();
     static void emitcInlines();
     static void emitcSyms(bool dpiHdrOnly = false);
     static void emitcTrace();
diff --git a/src/V3EmitCBase.h b/src/V3EmitCBase.h
index 6a3d471c1..4a82b6c81 100644
--- a/src/V3EmitCBase.h
+++ b/src/V3EmitCBase.h
@@ -86,6 +86,11 @@ public:
     static string topClassName() {  // Return name of top wrapper module
         return v3Global.opt.prefix();
     }
+
+    static bool isConstPoolMod(AstNode* modp) {
+        return modp == v3Global.rootp()->constPoolp()->modp();
+    }
+
     static AstCFile* newCFile(const string& filename, bool slow, bool source) {
         AstCFile* cfilep = new AstCFile(v3Global.rootp()->fileline(), filename);
         cfilep->slow(slow);
diff --git a/src/V3EmitCConstPool.cpp b/src/V3EmitCConstPool.cpp
new file mode 100644
index 000000000..7e48520d9
--- /dev/null
+++ b/src/V3EmitCConstPool.cpp
@@ -0,0 +1,194 @@
+// -*- mode: C++; c-file-style: "cc-mode" -*-
+//*************************************************************************
+// DESCRIPTION: Verilator: Emit C++ for tree
+//
+// Code available from: https://verilator.org
+//
+//*************************************************************************
+//
+// Copyright 2003-2021 by Wilson Snyder. This program is free software; you
+// can redistribute it and/or modify it under the terms of either the GNU
+// Lesser General Public License Version 3 or the Perl Artistic License
+// Version 2.0.
+// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+//
+//*************************************************************************
+
+#include "config_build.h"
+#include "verilatedos.h"
+
+#include "V3EmitC.h"
+#include "V3EmitCBase.h"
+#include "V3File.h"
+#include "V3Global.h"
+#include "V3String.h"
+#include "V3Stats.h"
+
+#include <algorithm>
+#include <cinttypes>
+
+//######################################################################
+// Const pool emitter
+
+class EmitCConstPool final : EmitCBaseVisitor {
+    // MEMBERS
+    bool m_inUnpacked = false;
+    uint32_t m_unpackedWord = 0;
+    uint32_t m_outFileCount = 0;
+    int m_outFileSize = 0;
+    VDouble0 m_tablesEmitted;
+    VDouble0 m_constsEmitted;
+
+    // METHODS
+    VL_DEBUG_FUNC;  // Declare debug()
+
+    V3OutCFile* newOutCFile() const {
+        const string fileName = v3Global.opt.makeDir() + "/" + topClassName() + "__ConstPool_"
+                                + cvtToStr(m_outFileCount) + ".cpp";
+        newCFile(fileName, /* slow: */ true, /* source: */ true);
+        V3OutCFile* const ofp = new V3OutCFile(fileName);
+        ofp->putsHeader();
+        ofp->puts("// DESCRIPTION: Verilator output: Constant pool\n");
+        ofp->puts("//\n");
+        ofp->puts("\n");
+        ofp->puts("#include \"verilated_heavy.h\"\n");
+        return ofp;
+    }
+
+    void maybeSplitCFile() {
+        if (v3Global.opt.outputSplit() && m_outFileSize < v3Global.opt.outputSplit()) return;
+        // Splitting file, so using parallel build.
+        v3Global.useParallelBuild(true);
+        // Close current file
+        VL_DO_DANGLING(delete m_ofp, m_ofp);
+        // Open next file
+        m_outFileSize = 0;
+        ++m_outFileCount;
+        m_ofp = newOutCFile();
+    }
+
+    void emitVars(const AstConstPool* poolp) {
+        std::vector<const AstVar*> varps;
+        for (AstNode* nodep = poolp->modp()->stmtsp(); nodep; nodep = nodep->nextp()) {
+            if (const AstVar* const varp = VN_CAST_CONST(nodep, Var)) { varps.push_back(varp); }
+        }
+
+        if (varps.empty()) return;  // Constant pool is empty, so we are done
+
+        stable_sort(varps.begin(), varps.end(), [](const AstVar* ap, const AstVar* bp) {  //
+            return ap->name() < bp->name();
+        });
+
+        m_ofp = newOutCFile();
+
+        for (const AstVar* varp : varps) {
+            maybeSplitCFile();
+            const string nameProtect = topClassName() + "__ConstPool__" + varp->nameProtect();
+            puts("\n");
+            puts("extern const ");
+            puts(varp->dtypep()->cType(nameProtect, false, false));
+            puts(" = ");
+            iterate(varp->valuep());
+            puts(";\n");
+            // Keep track of stats
+            if (VN_IS(varp->dtypep(), UnpackArrayDType)) {
+                ++m_tablesEmitted;
+            } else {
+                ++m_constsEmitted;
+            }
+        }
+
+        VL_DO_DANGLING(delete m_ofp, m_ofp);
+    }
+
+    // VISITORS
+    virtual void visit(AstNode* nodep) override { iterateChildrenConst(nodep); }
+
+    virtual void visit(AstInitArray* nodep) override {
+        const AstUnpackArrayDType* const dtypep
+            = VN_CAST(nodep->dtypep()->skipRefp(), UnpackArrayDType);
+        UASSERT_OBJ(dtypep, nodep, "Array initializer has non-array dtype");
+        const uint32_t size = dtypep->elementsConst();
+        const uint32_t elemBytes = dtypep->subDTypep()->widthTotalBytes();
+        const uint32_t tabMod = dtypep->subDTypep()->isString()
+                                    ? 1  // String
+                                    : elemBytes <= 2
+                                          ? 8  // CData, SData
+                                          : elemBytes <= 4 ? 4  // IData
+                                                           : elemBytes <= 8 ? 2  // QData
+                                                                            : 1;
+        VL_RESTORER(m_inUnpacked);
+        VL_RESTORER(m_unpackedWord);
+        m_inUnpacked = true;
+        // Note the double {{ initializer. The first { starts the initializer of the VlUnpacked,
+        // and the second starts the initializer of m_storage within the VlUnpacked.
+        puts("{");
+        ofp()->putsNoTracking("{");
+        puts("\n");
+        for (uint32_t n = 0; n < size; ++n) {
+            m_unpackedWord = n;
+            if (n) puts(n % tabMod ? ", " : ",\n");
+            iterate(nodep->getIndexDefaultedValuep(n));
+        }
+        puts("\n");
+        puts("}");
+        ofp()->putsNoTracking("}");
+    }
+
+    virtual void visit(AstInitItem* nodep) override {  // LCOV_EXCL_START
+        nodep->v3fatal("Handled by AstInitArray");
+    }  // LCOV_EXCL_END
+
+    virtual void visit(AstConst* nodep) override {
+        const V3Number& num = nodep->num();
+        UASSERT_OBJ(!num.isFourState(), nodep, "4-state value in constant pool");
+        AstNodeDType* const dtypep = nodep->dtypep();
+        m_outFileSize += 1;
+        if (num.isString()) {
+            // Note: putsQuoted does not track indentation, so we use this instead
+            puts("\"");
+            puts(num.toString());
+            puts("\"");
+            m_outFileSize += 9;
+        } else if (dtypep->isWide()) {
+            const uint32_t size = dtypep->widthWords();
+            m_outFileSize += size - 1;
+            // Note the double {{ initializer. The first { starts the initializer of the VlWide,
+            // and the second starts the initializer of m_storage within the VlWide.
+            puts("{");
+            ofp()->putsNoTracking("{");
+            if (m_inUnpacked) puts(" // VlWide " + cvtToStr(m_unpackedWord));
+            puts("\n");
+            for (uint32_t n = 0; n < size; ++n) {
+                if (n) puts(n % 4 ? ", " : ",\n");
+                ofp()->printf("0x%08" PRIx32, num.edataWord(n));
+            }
+            puts("\n");
+            puts("}");
+            ofp()->putsNoTracking("}");
+        } else if (dtypep->isQuad()) {
+            ofp()->printf("0x%016" PRIx64, static_cast<uint64_t>(num.toUQuad()));
+        } else if (dtypep->widthMin() > 16) {
+            ofp()->printf("0x%08" PRIx32, num.toUInt());
+        } else if (dtypep->widthMin() > 8) {
+            ofp()->printf("0x%04" PRIx32, num.toUInt());
+        } else {
+            ofp()->printf("0x%02" PRIx32, num.toUInt());
+        }
+    }
+
+public:
+    explicit EmitCConstPool(AstConstPool* poolp) {
+        emitVars(poolp);
+        V3Stats::addStatSum("ConstPool, Tables emitted", m_tablesEmitted);
+        V3Stats::addStatSum("ConstPool, Constants emitted", m_constsEmitted);
+    }
+};
+
+//######################################################################
+// EmitC static functions
+
+void V3EmitC::emitcConstPool() {
+    UINFO(2, __FUNCTION__ << ": " << endl);
+    EmitCConstPool(v3Global.rootp()->constPoolp());
+}
diff --git a/src/V3EmitCSyms.cpp b/src/V3EmitCSyms.cpp
index a04288b68..a2f7142d1 100644
--- a/src/V3EmitCSyms.cpp
+++ b/src/V3EmitCSyms.cpp
@@ -278,6 +278,7 @@ class EmitCSyms final : EmitCBaseVisitor {
             if (!m_dpiHdrOnly) emitDpiImp();
         }
     }
+    virtual void visit(AstConstPool* nodep) override {}  // Ignore
     virtual void visit(AstNodeModule* nodep) override {
         nameCheck(nodep);
         VL_RESTORER(m_modp);
diff --git a/src/V3EmitXml.cpp b/src/V3EmitXml.cpp
index e02173e09..3b452ef15 100644
--- a/src/V3EmitXml.cpp
+++ b/src/V3EmitXml.cpp
@@ -117,6 +117,7 @@ class EmitXmlFileVisitor final : public AstNVisitor {
         iterateChildren(nodep);
         puts("</netlist>\n");
     }
+    virtual void visit(AstConstPool*) override {}
     virtual void visit(AstNodeModule* nodep) override {
         outputTag(nodep, "");
         puts(" origName=");
@@ -316,6 +317,7 @@ private:
     VL_DEBUG_FUNC;  // Declare debug()
 
     // VISITORS
+    virtual void visit(AstConstPool*) override {}
     virtual void visit(AstNodeModule* nodep) override {
         if (nodep->level() >= 0
             && nodep->level() <= 2) {  // ==2 because we don't add wrapper when in XML mode
diff --git a/src/V3Global.cpp b/src/V3Global.cpp
index 73e78711a..f86106411 100644
--- a/src/V3Global.cpp
+++ b/src/V3Global.cpp
@@ -29,11 +29,7 @@
 //######################################################################
 // V3 Class -- top level
 
-AstNetlist* V3Global::makeNetlist() {
-    AstNetlist* newp = new AstNetlist();
-    newp->addTypeTablep(new AstTypeTable(newp->fileline()));
-    return newp;
-}
+AstNetlist* V3Global::makeNetlist() { return new AstNetlist(); }
 
 void V3Global::clear() {
 #ifdef VL_LEAK_CHECK
diff --git a/src/V3Hash.h b/src/V3Hash.h
index 6bb2963ba..b28b3bf1b 100644
--- a/src/V3Hash.h
+++ b/src/V3Hash.h
@@ -31,7 +31,7 @@ public:
     V3Hash()
         : m_value{0} {}
     explicit V3Hash(uint32_t val)
-        : m_value{val + 0x9e3779b9} {}  // This is the same as 'V3Hash() + val'
+        : m_value{val} {}
     explicit V3Hash(int32_t val)
         : m_value{static_cast<uint32_t>(val)} {}
     explicit V3Hash(size_t val)
diff --git a/src/V3Hasher.cpp b/src/V3Hasher.cpp
index 7562c0e16..775cee846 100644
--- a/src/V3Hasher.cpp
+++ b/src/V3Hasher.cpp
@@ -351,7 +351,17 @@ private:
         m_hash += hashNodeAndIterate(nodep, HASH_DTYPE, HASH_CHILDREN, [=]() {});
     }
     virtual void visit(AstInitArray* nodep) override {
-        m_hash += hashNodeAndIterate(nodep, HASH_DTYPE, HASH_CHILDREN, [=]() {});
+        // Hash unpacked array initializers by value, as the order of initializer nodes does not
+        // matter, and we want semantically equivalent initializers to map to the same hash.
+        AstUnpackArrayDType* const dtypep = VN_CAST(nodep->dtypep(), UnpackArrayDType);
+        m_hash += hashNodeAndIterate(nodep, HASH_DTYPE, /* hashChildren: */ !dtypep, [=]() {
+            if (dtypep) {
+                const uint32_t size = dtypep->elementsConst();
+                for (uint32_t n = 0; n < size; ++n) {  //
+                    iterateNull(nodep->getIndexDefaultedValuep(n));
+                }
+            }
+        });
     }
     virtual void visit(AstPragma* nodep) override {
         m_hash += hashNodeAndIterate(nodep, HASH_DTYPE, HASH_CHILDREN, [=]() {  //
diff --git a/src/V3LinkCells.cpp b/src/V3LinkCells.cpp
index 0578e5bc7..2e6f5532b 100644
--- a/src/V3LinkCells.cpp
+++ b/src/V3LinkCells.cpp
@@ -193,6 +193,7 @@ private:
                                                << "' was not found in design.");
         }
     }
+    virtual void visit(AstConstPool* nodep) override {}
     virtual void visit(AstNodeModule* nodep) override {
         // Module: Pick up modnames, so we can resolve cells later
         VL_RESTORER(m_modp);
diff --git a/src/V3LinkDot.cpp b/src/V3LinkDot.cpp
index d5d5d0748..102e92034 100644
--- a/src/V3LinkDot.cpp
+++ b/src/V3LinkDot.cpp
@@ -770,6 +770,7 @@ class LinkDotFindVisitor final : public AstNVisitor {
         }
     }
     virtual void visit(AstTypeTable*) override {}
+    virtual void visit(AstConstPool*) override {}
     virtual void visit(AstNodeModule* nodep) override {
         // Called on top module from Netlist, other modules from the cell creating them,
         // and packages
@@ -1364,6 +1365,7 @@ private:
 
     // VISITs
     virtual void visit(AstTypeTable*) override {}
+    virtual void visit(AstConstPool*) override {}
     virtual void visit(AstNodeModule* nodep) override {
         UINFO(5, "   " << nodep << endl);
         if (nodep->dead() || !nodep->user4()) {
@@ -1530,6 +1532,7 @@ class LinkDotScopeVisitor final : public AstNVisitor {
         // Recurse..., backward as must do packages before using packages
         iterateChildrenBackwards(nodep);
     }
+    virtual void visit(AstConstPool*) override {}
     virtual void visit(AstScope* nodep) override {
         UINFO(8, "  SCOPE " << nodep << endl);
         UASSERT_OBJ(m_statep->forScopeCreation(), nodep,
@@ -1925,6 +1928,7 @@ private:
         iterateChildrenBackwards(nodep);
     }
     virtual void visit(AstTypeTable*) override {}
+    virtual void visit(AstConstPool*) override {}
     virtual void visit(AstNodeModule* nodep) override {
         if (nodep->dead()) return;
         checkNoDot(nodep);
diff --git a/src/V3Options.cpp b/src/V3Options.cpp
index 52b24f349..8a5893a5b 100644
--- a/src/V3Options.cpp
+++ b/src/V3Options.cpp
@@ -1141,6 +1141,7 @@ void V3Options::parseOptsList(FileLine* fl, const string& optdir, int argc, char
         }
     });
     DECL_OPTION("-max-num-width", Set, &m_maxNumWidth);
+    DECL_OPTION("-merge-const-pool", OnOff, &m_mergeConstPool);
     DECL_OPTION("-mod-prefix", Set, &m_modPrefix);
 
     DECL_OPTION("-O", CbPartialMatch, [this](const char* optp) {
diff --git a/src/V3Options.h b/src/V3Options.h
index dff879acf..3f33c90d3 100644
--- a/src/V3Options.h
+++ b/src/V3Options.h
@@ -246,6 +246,7 @@ private:
     bool m_lintOnly = false;        // main switch: --lint-only
     bool m_gmake = false;           // main switch: --make gmake
     bool m_main = false;            // main swithc: --main
+    bool m_mergeConstPool = true;   // main switch: --merge-const-pool
     bool m_orderClockDly = true;    // main switch: --order-clock-delay
     bool m_outFormatOk = false;     // main switch: --cc, --sc or --sp was specified
     bool m_pedantic = false;        // main switch: --Wpedantic
@@ -454,6 +455,7 @@ public:
     bool traceStructs() const { return m_traceStructs; }
     bool traceUnderscore() const { return m_traceUnderscore; }
     bool main() const { return m_main; }
+    bool mergeConstPool() const { return m_mergeConstPool; }
     bool orderClockDly() const { return m_orderClockDly; }
     bool outFormatOk() const { return m_outFormatOk; }
     bool keepTempFiles() const { return (V3Error::debugDefault() != 0); }
diff --git a/src/V3Premit.cpp b/src/V3Premit.cpp
index 82c2404ae..1f7aaf584 100644
--- a/src/V3Premit.cpp
+++ b/src/V3Premit.cpp
@@ -92,11 +92,9 @@ private:
     //  AstNodeMath::user()     -> bool.  True if iterated already
     //  AstShiftL::user2()      -> bool.  True if converted to conditional
     //  AstShiftR::user2()      -> bool.  True if converted to conditional
-    //  AstConst::user2p()      -> Replacement static variable pointer
     //  *::user4()              -> See PremitAssignVisitor
     AstUser1InUse m_inuser1;
     AstUser2InUse m_inuser2;
-    // AstUser4InUse     part of V3Hasher via V3DupFinder
 
     // STATE
     AstNodeModule* m_modp = nullptr;  // Current module
@@ -106,10 +104,7 @@ private:
     AstTraceInc* m_inTracep = nullptr;  // Inside while loop, special statement additions
     bool m_assignLhs = false;  // Inside assignment lhs, don't breakup extracts
 
-    V3DupFinder m_dupFinder;  // Duplicate finder for static constants that can be reused
-
-    VDouble0 m_staticConstantsExtracted;  // Statistic tracking
-    VDouble0 m_staticConstantsReused;  // Statistic tracking
+    VDouble0 m_extractedToConstPool;  // Statistic tracking
 
     // METHODS
     VL_DEBUG_FUNC;  // Declare debug()
@@ -170,71 +165,48 @@ private:
     }
 
     void createDeepTemp(AstNode* nodep, bool noSubst) {
-        if (nodep->user1()) return;
-        if (debug() > 8) nodep->dumpTree(cout, "deepin:");
+        if (nodep->user1SetOnce()) return;  // Only add another assignment for this node
 
-        AstNRelinker linker;
-        nodep->unlinkFrBack(&linker);
+        AstNRelinker relinker;
+        nodep->unlinkFrBack(&relinker);
 
+        FileLine* const fl = nodep->fileline();
         AstVar* varp = nullptr;
-
         AstConst* const constp = VN_CAST(nodep, Const);
-
-        const bool useStatic = constp && (constp->width() >= STATIC_CONST_MIN_WIDTH)
-                               && !constp->num().isFourState();
-        if (useStatic) {
-            // Extract as static constant
-            const auto& it = m_dupFinder.findDuplicate(constp);
-            if (it == m_dupFinder.end()) {
-                const string newvarname = string("__Vconst") + cvtToStr(m_modp->varNumGetInc());
-                varp = new AstVar(nodep->fileline(), AstVarType::MODULETEMP, newvarname,
-                                  nodep->dtypep());
-                varp->isConst(true);
-                varp->isStatic(true);
-                varp->valuep(constp);
-                m_modp->addStmtp(varp);
-                m_dupFinder.insert(constp);
-                nodep->user2p(varp);
-                ++m_staticConstantsExtracted;
-            } else {
-                varp = VN_CAST(it->second->user2p(), Var);
-                ++m_staticConstantsReused;
-            }
+        const bool useConstPool = constp  // Is a constant
+                                  && (constp->width() >= STATIC_CONST_MIN_WIDTH)  // Large enough
+                                  && !constp->num().isFourState()  // Not four state
+                                  && !constp->num().isString();  // Not a string
+        if (useConstPool) {
+            // Extract into constant pool.
+            const bool merge = v3Global.opt.mergeConstPool();
+            varp = v3Global.rootp()->constPoolp()->findConst(constp, merge)->varp();
+            nodep->deleteTree();
+            ++m_extractedToConstPool;
         } else {
             // Keep as local temporary
-            const string newvarname = string("__Vtemp") + cvtToStr(m_modp->varNumGetInc());
-            varp
-                = new AstVar(nodep->fileline(), AstVarType::STMTTEMP, newvarname, nodep->dtypep());
+            const string name = string("__Vtemp") + cvtToStr(m_modp->varNumGetInc());
+            varp = new AstVar(fl, AstVarType::STMTTEMP, name, nodep->dtypep());
             m_cfuncp->addInitsp(varp);
-        }
-
-        if (noSubst) varp->noSubst(true);  // Do not remove varrefs to this in V3Const
-
-        // Replace node tree with reference to var
-        AstVarRef* newp = new AstVarRef(nodep->fileline(), varp, VAccess::READ);
-        linker.relink(newp);
-
-        if (!useStatic) {
             // Put assignment before the referencing statement
-            AstAssign* assp = new AstAssign(
-                nodep->fileline(), new AstVarRef(nodep->fileline(), varp, VAccess::WRITE), nodep);
-            insertBeforeStmt(assp);
-            if (debug() > 8) assp->dumpTree(cout, "deepou:");
+            insertBeforeStmt(new AstAssign(fl, new AstVarRef(fl, varp, VAccess::WRITE), nodep));
         }
 
-        nodep->user1(true);  // Don't add another assignment
+        // Do not remove VarRefs to this in V3Const
+        if (noSubst) varp->noSubst(true);
+
+        // Replace node with VarRef to new Var
+        relinker.relink(new AstVarRef(fl, varp, VAccess::READ));
     }
 
     // VISITORS
     virtual void visit(AstNodeModule* nodep) override {
         UINFO(4, " MOD   " << nodep << endl);
         UASSERT_OBJ(m_modp == nullptr, nodep, "Nested modules ?");
-        UASSERT_OBJ(m_dupFinder.empty(), nodep, "Statements outside module ?");
         m_modp = nodep;
         m_cfuncp = nullptr;
         iterateChildren(nodep);
         m_modp = nullptr;
-        m_dupFinder.clear();
     }
     virtual void visit(AstCFunc* nodep) override {
         VL_RESTORER(m_cfuncp);
@@ -442,9 +414,8 @@ public:
     // CONSTRUCTORS
     explicit PremitVisitor(AstNetlist* nodep) { iterate(nodep); }
     virtual ~PremitVisitor() {
-        V3Stats::addStat("Optimizations, Prelim static constants extracted",
-                         m_staticConstantsExtracted);
-        V3Stats::addStat("Optimizations, Prelim static constants reused", m_staticConstantsReused);
+        V3Stats::addStat("Optimizations, Prelim extracted value to ConstPool",
+                         m_extractedToConstPool);
     }
 };
 
diff --git a/src/V3String.h b/src/V3String.h
index 47c41e9ee..1b185ce04 100644
--- a/src/V3String.h
+++ b/src/V3String.h
@@ -22,9 +22,11 @@
 
 // No V3 headers here - this is a base class for Vlc etc
 
+#include <iomanip>
 #include <map>
 #include <sstream>
 #include <string>
+#include <type_traits>
 #include <unordered_map>
 #include <vector>
 
@@ -36,11 +38,18 @@ template <class T> std::string cvtToStr(const T& t) {
     os << t;
     return os.str();
 }
-template <class T> std::string cvtToHex(const T* tp) {
+template <class T>
+typename std::enable_if<std::is_pointer<T>::value, std::string>::type cvtToHex(const T tp) {
     std::ostringstream os;
     os << static_cast<const void*>(tp);
     return os.str();
 }
+template <class T>
+typename std::enable_if<std::is_integral<T>::value, std::string>::type cvtToHex(const T t) {
+    std::ostringstream os;
+    os << std::hex << std::setw(sizeof(T) * 8 / 4) << std::setfill('0') << t;
+    return os.str();
+}
 
 inline uint32_t cvtToHash(const void* vp) {
     // We can shove a 64 bit pointer into a 32 bit bucket
diff --git a/src/V3Table.cpp b/src/V3Table.cpp
index eb29e3639..d233cd60e 100644
--- a/src/V3Table.cpp
+++ b/src/V3Table.cpp
@@ -38,11 +38,15 @@
 
 // CONFIG
 // 1MB is max table size (better be lots of instructs to be worth it!)
-static const double TABLE_MAX_BYTES = 1 * 1024 * 1024;
+static constexpr int TABLE_MAX_BYTES = 1 * 1024 * 1024;
 // 64MB is close to max memory of some systems (256MB or so), so don't get out of control
-static const double TABLE_TOTAL_BYTES = 64 * 1024 * 1024;
-static const double TABLE_SPACE_TIME_MULT = 8;  // Worth 8 bytes of data to replace a instruction
-static const int TABLE_MIN_NODE_COUNT = 32;  // If < 32 instructions, not worth the effort
+static constexpr int TABLE_TOTAL_BYTES = 64 * 1024 * 1024;
+// Worth no more than 8 bytes of data to replace an instruction
+static constexpr int TABLE_SPACE_TIME_MULT = 8;
+// If < 32 instructions, not worth the effort
+static constexpr int TABLE_MIN_NODE_COUNT = 32;
+// Assume an instruction is 4 bytes
+static constexpr int TABLE_BYTES_PER_INST = 4;
 
 //######################################################################
 
@@ -62,6 +66,81 @@ public:
     virtual ~TableSimulateVisitor() override = default;
 };
 
+//######################################################################
+// Class for holding lookup table state during construction
+
+class TableBuilder final {
+    FileLine* const m_fl;  // FileLine used during construction
+    AstInitArray* m_initp = nullptr;  // The lookup table initializer values
+    AstVarScope* m_varScopep = nullptr;  // The scoped variable holding the table
+
+public:
+    explicit TableBuilder(FileLine* fl)
+        : m_fl{fl} {}
+
+    ~TableBuilder() {
+        if (m_initp) m_initp->deleteTree();
+    }
+
+    void setTableSize(AstNodeDType* elemDType, unsigned size) {
+        UASSERT_OBJ(!m_initp, m_fl, "Table size already set");
+        UASSERT_OBJ(size > 0, m_fl, "Size zero");
+        // TODO: Assert elemDType is a packed type
+        // Create data type
+        const int width = elemDType->width();
+        AstNodeDType* const subDTypep
+            = elemDType->isString()
+                  ? elemDType
+                  : v3Global.rootp()->findBitDType(width, width, VSigning::UNSIGNED);
+        AstUnpackArrayDType* const tableDTypep
+            = new AstUnpackArrayDType(m_fl, subDTypep, new AstRange(m_fl, size, 0));
+        v3Global.rootp()->typeTablep()->addTypesp(tableDTypep);
+        // Create table initializer (with default value 0)
+        AstConst* const defaultp = elemDType->isString()
+                                       ? new AstConst(m_fl, AstConst::String(), "")
+                                       : new AstConst(m_fl, AstConst::WidthedValue(), width, 0);
+        m_initp = new AstInitArray(m_fl, tableDTypep, defaultp);
+    }
+
+    void addValue(unsigned index, const V3Number& value) {
+        UASSERT_OBJ(!m_varScopep, m_fl, "Table variable already created");
+        // Default value is zero/empty string so don't add it
+        if (value.isString() ? value.toString().empty() : value.isEqZero()) return;
+        m_initp->addIndexValuep(index, new AstConst(m_fl, value));
+    }
+
+    AstVarScope* varScopep() {
+        if (!m_varScopep) { m_varScopep = v3Global.rootp()->constPoolp()->findTable(m_initp); }
+        return m_varScopep;
+    }
+};
+
+//######################################################################
+// Class for holding output variable state during table conversion of logic
+
+class TableOutputVar final {
+    AstVarScope* const m_varScopep;  // The output variable
+    const unsigned m_ord;  // Output ordinal number in this block
+    bool m_mayBeUnassigned = false;  // If true, then this variable may be unassigned through
+                                     // some path through the block being table converted
+    TableBuilder m_tableBuilder;
+
+public:
+    TableOutputVar(AstVarScope* varScopep, unsigned ord)
+        : m_varScopep{varScopep}
+        , m_ord{ord}
+        , m_tableBuilder{varScopep->fileline()} {}
+
+    AstVarScope* varScopep() const { return m_varScopep; }
+    string name() const { return varScopep()->varp()->name(); }
+    unsigned ord() const { return m_ord; }
+    void setMayBeUnassigned() { m_mayBeUnassigned = true; }
+    bool mayBeUnassigned() const { return m_mayBeUnassigned; }
+    void setTableSize(unsigned size) { m_tableBuilder.setTableSize(varScopep()->dtypep(), size); }
+    void addValue(unsigned index, const V3Number& value) { m_tableBuilder.addValue(index, value); }
+    AstVarScope* tabeVarScopep() { return m_tableBuilder.varScopep(); }
+};
+
 //######################################################################
 // Table class functions
 
@@ -84,44 +163,54 @@ private:
 
     //  State cleared on each always/assignw
     bool m_assignDly = false;  // Consists of delayed assignments instead of normal assignments
-    int m_inWidth = 0;  // Input table width
-    int m_outWidth = 0;  // Output table width
+    unsigned m_inWidthBits = 0;  // Input table width - in bits
+    unsigned m_outWidthBytes = 0;  // Output table width - in bytes
     std::deque<AstVarScope*> m_inVarps;  // Input variable list
-    std::deque<AstVarScope*> m_outVarps;  // Output variable list
-    std::deque<bool> m_outNotSet;  // True if output variable is not set at some point
-
-    // When creating a table
-    std::deque<AstVarScope*> m_tableVarps;  // Table being created
+    std::vector<TableOutputVar> m_outVarps;  // Output variable list
 
     // METHODS
     VL_DEBUG_FUNC;  // Declare debug()
 
+public:
+    void simulateVarRefCb(AstVarRef* nodep) {
+        // Called by TableSimulateVisitor on each unique varref encountered
+        UINFO(9, "   SimVARREF " << nodep << endl);
+        AstVarScope* vscp = nodep->varScopep();
+        if (nodep->access().isWriteOrRW()) {
+            // We'll make the table with a separate natural alignment for each output var, so
+            // always have 8, 16 or 32 bit widths, so use widthTotalBytes
+            m_outWidthBytes += nodep->varp()->dtypeSkipRefp()->widthTotalBytes();
+            m_outVarps.emplace_back(vscp, m_outVarps.size());
+        }
+        if (nodep->access().isReadOrRW()) {
+            m_inWidthBits += nodep->varp()->width();
+            m_inVarps.push_back(vscp);
+        }
+    }
+
+private:
     bool treeTest(AstAlways* nodep) {
         // Process alw/assign tree
-        m_inWidth = 0;
-        m_outWidth = 0;
+        m_inWidthBits = 0;
+        m_outWidthBytes = 0;
         m_inVarps.clear();
         m_outVarps.clear();
-        m_outNotSet.clear();
 
         // Collect stats
         TableSimulateVisitor chkvis(this);
         chkvis.mainTableCheck(nodep);
         m_assignDly = chkvis.isAssignDly();
-        // Also sets m_inWidth
-        // Also sets m_outWidth
+        // Also sets m_inWidthBits
+        // Also sets m_outWidthBytes
         // Also sets m_inVarps
         // Also sets m_outVarps
 
         // Calc data storage in bytes
-        size_t chgWidth = m_outVarps.size();  // Width of one change-it-vector
-        if (chgWidth < 8) chgWidth = 8;
-        double space = (std::pow(static_cast<double>(2.0), static_cast<double>(m_inWidth))
-                        * static_cast<double>(m_outWidth + chgWidth));
+        const size_t chgWidth = m_outVarps.size();
+        const double space = std::pow<double>(2.0, m_inWidthBits) * (m_outWidthBytes + chgWidth);
         // Instruction count bytes (ok, it's space also not time :)
-        double bytesPerInst = 4;
-        double time = ((chkvis.instrCount() * bytesPerInst + chkvis.dataCount())
-                       + 1);  // +1 so won't div by zero
+        const double time  // max(_, 1), so we won't divide by zero
+            = std::max<double>(chkvis.instrCount() * TABLE_BYTES_PER_INST + chkvis.dataCount(), 1);
         if (chkvis.instrCount() < TABLE_MIN_NODE_COUNT) {
             chkvis.clearOptimizable(nodep, "Table has too few nodes involved");
         }
@@ -134,13 +223,13 @@ private:
         if (m_totalBytes > TABLE_TOTAL_BYTES) {
             chkvis.clearOptimizable(nodep, "Table out of memory");
         }
-        if (!m_outWidth || !m_inWidth) {  //
+        if (!m_outWidthBytes || !m_inWidthBits) {
             chkvis.clearOptimizable(nodep, "Table has no outputs");
         }
-        UINFO(4, "  Test: Opt=" << (chkvis.optimizable() ? "OK" : "NO")
-                                << ", Instrs=" << chkvis.instrCount()
-                                << " Data=" << chkvis.dataCount() << " inw=" << m_inWidth
-                                << " outw=" << m_outWidth << " Spacetime=" << (space / time) << "("
+        UINFO(4, "  Test: Opt=" << (chkvis.optimizable() ? "OK" : "NO") << ", Instrs="
+                                << chkvis.instrCount() << " Data=" << chkvis.dataCount()
+                                << " in width (bits)=" << m_inWidthBits << " out width (bytes)="
+                                << m_outWidthBytes << " Spacetime=" << (space / time) << "("
                                 << space << "/" << time << ")"
                                 << ": " << nodep << endl);
         if (chkvis.optimizable()) {
@@ -150,135 +239,51 @@ private:
         return chkvis.optimizable();
     }
 
-public:
-    void simulateVarRefCb(AstVarRef* nodep) {
-        // Called by TableSimulateVisitor on each unique varref encountered
-        UINFO(9, "   SimVARREF " << nodep << endl);
-        AstVarScope* vscp = nodep->varScopep();
-        if (nodep->access().isWriteOrRW()) {
-            m_outWidth += nodep->varp()->dtypeSkipRefp()->widthTotalBytes();
-            m_outVarps.push_back(vscp);
-        }
-        if (nodep->access().isReadOrRW()) {
-            // We'll make the table with a separate natural alignment for each
-            // output var, so always have char, 16 or 32 bit widths, so use widthTotalBytes
-            m_inWidth += nodep->varp()->width();  // Space for var
-            m_inVarps.push_back(vscp);
-        }
-    }
-
-private:
-    void createTable(AstAlways* nodep) {
+    void replaceWithTable(AstAlways* nodep) {
         // We've determined this table of nodes is optimizable, do it.
         ++m_modTables;
         ++m_statTablesCre;
 
-        // Index into our table
-        AstVar* indexVarp
-            = new AstVar(nodep->fileline(), AstVarType::BLOCKTEMP,
-                         "__Vtableidx" + cvtToStr(m_modTables), VFlagBitPacked(), m_inWidth);
+        FileLine* const fl = nodep->fileline();
+
+        // We will need a table index variable, create it here.
+        AstVar* const indexVarp
+            = new AstVar(fl, AstVarType::BLOCKTEMP, "__Vtableidx" + cvtToStr(m_modTables),
+                         VFlagBitPacked(), m_inWidthBits);
         m_modp->addStmtp(indexVarp);
-        AstVarScope* indexVscp = new AstVarScope(indexVarp->fileline(), m_scopep, indexVarp);
+        AstVarScope* const indexVscp = new AstVarScope(indexVarp->fileline(), m_scopep, indexVarp);
         m_scopep->addVarp(indexVscp);
 
-        // Change it variable
-        FileLine* fl = nodep->fileline();
-        AstNodeArrayDType* dtypep = new AstUnpackArrayDType(
-            fl, nodep->findBitDType(m_outVarps.size(), m_outVarps.size(), VSigning::UNSIGNED),
-            new AstRange(fl, VL_MASK_I(m_inWidth), 0));
-        v3Global.rootp()->typeTablep()->addTypesp(dtypep);
-        AstVar* chgVarp = new AstVar(fl, AstVarType::MODULETEMP,
-                                     "__Vtablechg" + cvtToStr(m_modTables), dtypep);
-        chgVarp->isConst(true);
-        chgVarp->valuep(new AstInitArray(nodep->fileline(), dtypep, nullptr));
-        m_modp->addStmtp(chgVarp);
-        AstVarScope* chgVscp = new AstVarScope(chgVarp->fileline(), m_scopep, chgVarp);
-        m_scopep->addVarp(chgVscp);
+        // The 'output assigned' table builder
+        TableBuilder outputAssignedTableBuilder(fl);
+        outputAssignedTableBuilder.setTableSize(
+            nodep->findBitDType(m_outVarps.size(), m_outVarps.size(), VSigning::UNSIGNED),
+            VL_MASK_I(m_inWidthBits));
 
-        createTableVars(nodep);
-        AstNode* stmtsp = createLookupInput(nodep, indexVscp);
-        createTableValues(nodep, chgVscp);
+        // Set sizes of output tables
+        for (TableOutputVar& tov : m_outVarps) { tov.setTableSize(VL_MASK_I(m_inWidthBits)); }
 
-        // Collapse duplicate tables
-        chgVscp = findDuplicateTable(chgVscp);
-        for (auto& vscp : m_tableVarps) vscp = findDuplicateTable(vscp);
+        // Populate the tables
+        createTables(nodep, outputAssignedTableBuilder);
 
-        createOutputAssigns(nodep, stmtsp, indexVscp, chgVscp);
+        AstNode* stmtsp = createLookupInput(fl, indexVscp);
+        createOutputAssigns(nodep, stmtsp, indexVscp, outputAssignedTableBuilder.varScopep());
 
         // Link it in.
-        if (AstAlways* nodeap = VN_CAST(nodep, Always)) {
-            // Keep sensitivity list, but delete all else
-            nodeap->bodysp()->unlinkFrBackWithNext()->deleteTree();
-            nodeap->addStmtp(stmtsp);
-            if (debug() >= 6) nodeap->dumpTree(cout, "  table_new: ");
-        } else {  // LCOV_EXCL_LINE
-            nodep->v3fatalSrc("Creating table under unknown node type");
-        }
-
-        // Cleanup internal structures
-        m_tableVarps.clear();
+        // Keep sensitivity list, but delete all else
+        nodep->bodysp()->unlinkFrBackWithNext()->deleteTree();
+        nodep->addStmtp(stmtsp);
+        if (debug() >= 6) nodep->dumpTree(cout, "  table_new: ");
     }
 
-    void createTableVars(AstNode* nodep) {
-        // Create table for each output
-        std::map<const std::string, int> namecounts;
-        for (const AstVarScope* outvscp : m_outVarps) {
-            AstVar* outvarp = outvscp->varp();
-            FileLine* fl = nodep->fileline();
-            AstNodeArrayDType* dtypep = new AstUnpackArrayDType(
-                fl, outvarp->dtypep(), new AstRange(fl, VL_MASK_I(m_inWidth), 0));
-            v3Global.rootp()->typeTablep()->addTypesp(dtypep);
-            string name = "__Vtable" + cvtToStr(m_modTables) + "_" + outvarp->name();
-            const auto nit = namecounts.find(name);
-            if (nit != namecounts.end()) {
-                // Multiple scopes can have same var name. We could append the
-                // scope name but that is very long, so just deduplicate.
-                name += "__dedup" + cvtToStr(++nit->second);
-            } else {
-                namecounts[name] = 0;
-            }
-            AstVar* tablevarp = new AstVar(fl, AstVarType::MODULETEMP, name, dtypep);
-            tablevarp->isConst(true);
-            tablevarp->isStatic(true);
-            tablevarp->valuep(new AstInitArray(nodep->fileline(), dtypep, nullptr));
-            m_modp->addStmtp(tablevarp);
-            AstVarScope* tablevscp = new AstVarScope(tablevarp->fileline(), m_scopep, tablevarp);
-            m_scopep->addVarp(tablevscp);
-            m_tableVarps.push_back(tablevscp);
-        }
-    }
-
-    AstNode* createLookupInput(AstNode* nodep, AstVarScope* indexVscp) {
-        // Concat inputs into a single temp variable (inside always)
-        // First var in inVars becomes the LSB of the concat
-        AstNode* concatp = nullptr;
-        for (AstVarScope* invscp : m_inVarps) {
-            AstVarRef* refp = new AstVarRef(nodep->fileline(), invscp, VAccess::READ);
-            if (concatp) {
-                concatp = new AstConcat(nodep->fileline(), refp, concatp);
-            } else {
-                concatp = refp;
-            }
-        }
-
-        AstNode* stmtsp
-            = new AstAssign(nodep->fileline(),
-                            new AstVarRef(nodep->fileline(), indexVscp, VAccess::WRITE), concatp);
-        return stmtsp;
-    }
-
-    void createTableValues(AstAlways* nodep, AstVarScope* chgVscp) {
+    void createTables(AstAlways* nodep, TableBuilder& outputAssignedTableBuilder) {
         // Create table
         // There may be a simulation path by which the output doesn't change value.
         // We could bail on these cases, or we can have a "change it" boolean.
         // We've chosen the latter route, since recirc is common in large FSMs.
-        for (std::deque<AstVarScope*>::iterator it = m_outVarps.begin(); it != m_outVarps.end();
-             ++it) {
-            m_outNotSet.push_back(false);
-        }
-        uint32_t inValueNextInitArray = 0;
         TableSimulateVisitor simvis(this);
-        for (uint32_t inValue = 0; inValue <= VL_MASK_I(m_inWidth); inValue++) {
+        for (uint32_t i = 0; i <= VL_MASK_I(m_inWidthBits); ++i) {
+            const uint32_t inValue = i;
             // Make a new simulation structure so we can set new input values
             UINFO(8, " Simulating " << std::hex << inValue << endl);
 
@@ -290,12 +295,12 @@ private:
             uint32_t shift = 0;
             for (AstVarScope* invscp : m_inVarps) {
                 // LSB is first variable, so extract it that way
-                AstConst cnst(invscp->fileline(), AstConst::WidthedValue(), invscp->width(),
-                              VL_MASK_I(invscp->width()) & (inValue >> shift));
+                const AstConst cnst(invscp->fileline(), AstConst::WidthedValue(), invscp->width(),
+                                    VL_MASK_I(invscp->width()) & (inValue >> shift));
                 simvis.newValue(invscp, &cnst);
                 shift += invscp->width();
-                // We're just using32 bit arithmetic, because there's no
-                // way the input table can be 2^32 bytes!
+                // We are using 32 bit arithmetic, because there's no way the input table can be
+                // 2^32 bytes!
                 UASSERT_OBJ(shift <= 32, nodep, "shift overflow");
                 UINFO(8, "   Input " << invscp->name() << " = " << cnst.name() << endl);
             }
@@ -306,104 +311,72 @@ private:
                         "Optimizable cleared, even though earlier test run said not: "
                             << simvis.whyNotMessage());
 
-            // If a output changed, add it to table
-            int outnum = 0;
-            V3Number outputChgMask(nodep, m_outVarps.size(), 0);
-            for (AstVarScope* outvscp : m_outVarps) {
-                V3Number* outnump = simvis.fetchOutNumberNull(outvscp);
-                AstNode* setp;
-                if (!outnump) {
-                    UINFO(8, "   Output " << outvscp->name() << " never set\n");
-                    m_outNotSet[outnum] = true;
-                    // Value in table is arbitrary, but we need something
-                    setp = new AstConst(outvscp->fileline(), AstConst::WidthedValue(),
-                                        outvscp->width(), 0);
+            // Build output value tables and the assigned flags table
+            V3Number outputAssignedMask(nodep, m_outVarps.size(), 0);
+            for (TableOutputVar& tov : m_outVarps) {
+                if (V3Number* const outnump = simvis.fetchOutNumberNull(tov.varScopep())) {
+                    UINFO(8, "   Output " << tov.name() << " = " << *outnump << endl);
+                    outputAssignedMask.setBit(tov.ord(), 1);  // Mark output as assigned
+                    tov.addValue(inValue, *outnump);
                 } else {
-                    UINFO(8, "   Output " << outvscp->name() << " = " << *outnump << endl);
-                    //  m_tableVarps[inValue] = num;
-                    // Mark changed bit, too
-                    outputChgMask.setBit(outnum, 1);
-                    setp = new AstConst(outnump->fileline(), *outnump);
+                    UINFO(8, "   Output " << tov.name() << " not set for this input\n");
+                    tov.setMayBeUnassigned();
                 }
-                // Note InitArray requires us to have the values in inValue order
-                VN_CAST(m_tableVarps[outnum]->varp()->valuep(), InitArray)->addValuep(setp);
-                outnum++;
             }
 
-            {  // Set changed table
-                UASSERT_OBJ(inValue == inValueNextInitArray, nodep,
-                            "InitArray requires us to have the values in inValue order");
-                inValueNextInitArray++;
-                AstNode* setp = new AstConst(nodep->fileline(), outputChgMask);
-                VN_CAST(chgVscp->varp()->valuep(), InitArray)->addValuep(setp);
-            }
+            // Set changed table
+            outputAssignedTableBuilder.addValue(inValue, outputAssignedMask);
         }  // each value
     }
 
-    AstVarScope* findDuplicateTable(AstVarScope* vsc1p) {
-        // See if another table we've created is identical, if so use it for both.
-        // (A more 'modern' way would be to instead use V3DupFinder::findDuplicate)
-        AstVar* var1p = vsc1p->varp();
-        for (AstVarScope* vsc2p : m_modTableVscs) {
-            AstVar* var2p = vsc2p->varp();
-            if (var1p->width() == var2p->width()
-                && (var1p->dtypep()->arrayUnpackedElements()
-                    == var2p->dtypep()->arrayUnpackedElements())) {
-                const AstNode* init1p = VN_CAST(var1p->valuep(), InitArray);
-                const AstNode* init2p = VN_CAST(var2p->valuep(), InitArray);
-                if (init1p->sameGateTree(init2p)) {
-                    UINFO(8, "   Duplicate table var " << vsc2p << " == " << vsc1p << endl);
-                    VL_DO_DANGLING(vsc1p->unlinkFrBack()->deleteTree(), vsc1p);
-                    return vsc2p;
-                }
+    AstNode* createLookupInput(FileLine* fl, AstVarScope* indexVscp) {
+        // Concat inputs into a single temp variable (inside always)
+        // First var in inVars becomes the LSB of the concat
+        AstNode* concatp = nullptr;
+        for (AstVarScope* invscp : m_inVarps) {
+            AstVarRef* refp = new AstVarRef(fl, invscp, VAccess::READ);
+            if (concatp) {
+                concatp = new AstConcat(fl, refp, concatp);
+            } else {
+                concatp = refp;
             }
         }
-        m_modTableVscs.push_back(vsc1p);
-        return vsc1p;
+
+        return new AstAssign(fl, new AstVarRef(fl, indexVscp, VAccess::WRITE), concatp);
+    }
+
+    AstArraySel* select(FileLine* fl, AstVarScope* fromp, AstVarScope* indexp) {
+        AstVarRef* const fromRefp = new AstVarRef(fl, fromp, VAccess::READ);
+        AstVarRef* const indexRefp = new AstVarRef(fl, indexp, VAccess::READ);
+        return new AstArraySel(fl, fromRefp, indexRefp);
     }
 
     void createOutputAssigns(AstNode* nodep, AstNode* stmtsp, AstVarScope* indexVscp,
-                             AstVarScope* chgVscp) {
-        // We walk through the changemask table, and if all ones know
-        // the output is set on all branches and therefore eliminate the
-        // if.  If all uses of the changemask disappear, dead code
-        // elimination will remove it for us.
-        // Set each output from array ref into our table
-        int outnum = 0;
-        for (AstVarScope* outvscp : m_outVarps) {
-            AstNode* alhsp = new AstVarRef(nodep->fileline(), outvscp, VAccess::WRITE);
-            AstNode* arhsp = new AstArraySel(
-                nodep->fileline(),
-                new AstVarRef(nodep->fileline(), m_tableVarps[outnum], VAccess::READ),
-                new AstVarRef(nodep->fileline(), indexVscp, VAccess::READ));
-            AstNode* outasnp
-                = (m_assignDly
-                       ? static_cast<AstNode*>(new AstAssignDly(nodep->fileline(), alhsp, arhsp))
-                       : static_cast<AstNode*>(new AstAssign(nodep->fileline(), alhsp, arhsp)));
-            AstNode* outsetp = outasnp;
+                             AstVarScope* outputAssignedTableVscp) {
+        FileLine* const fl = nodep->fileline();
+        for (TableOutputVar& tov : m_outVarps) {
+            AstNode* const alhsp = new AstVarRef(fl, tov.varScopep(), VAccess::WRITE);
+            AstNode* const arhsp = select(fl, tov.tabeVarScopep(), indexVscp);
+            AstNode* outsetp = m_assignDly
+                                   ? static_cast<AstNode*>(new AstAssignDly(fl, alhsp, arhsp))
+                                   : static_cast<AstNode*>(new AstAssign(fl, alhsp, arhsp));
 
-            // Is the value set in only some branches of the table?
-            if (m_outNotSet[outnum]) {
+            // If this output is unassigned on some code paths, wrap the assignment in an If
+            if (tov.mayBeUnassigned()) {
                 V3Number outputChgMask(nodep, m_outVarps.size(), 0);
-                outputChgMask.setBit(outnum, 1);
-                outsetp = new AstIf(
-                    nodep->fileline(),
-                    new AstAnd(nodep->fileline(),
-                               new AstArraySel(
-                                   nodep->fileline(),
-                                   new AstVarRef(nodep->fileline(), chgVscp, VAccess::READ),
-                                   new AstVarRef(nodep->fileline(), indexVscp, VAccess::READ)),
-                               new AstConst(nodep->fileline(), outputChgMask)),
-                    outsetp, nullptr);
+                outputChgMask.setBit(tov.ord(), 1);
+                AstNode* const condp
+                    = new AstAnd(fl, select(fl, outputAssignedTableVscp, indexVscp),
+                                 new AstConst(fl, outputChgMask));
+                outsetp = new AstIf(fl, condp, outsetp, nullptr);
             }
 
             stmtsp->addNext(outsetp);
-            outnum++;
         }
     }
 
     // VISITORS
-    virtual void visit(AstNetlist* nodep) override { iterateChildren(nodep); }
+    virtual void visit(AstNode* nodep) override { iterateChildren(nodep); }
     virtual void visit(AstNodeModule* nodep) override {
         VL_RESTORER(m_modp);
         VL_RESTORER(m_modTables);
@@ -425,16 +398,14 @@ private:
         UINFO(4, "  ALWAYS  " << nodep << endl);
         if (treeTest(nodep)) {
             // Well, then, I'll be a memory hog.
-            VL_DO_DANGLING(createTable(nodep), nodep);
+            replaceWithTable(nodep);
         }
     }
-    virtual void visit(AstAssignAlias*) override {}
-    virtual void visit(AstAssignW* nodep) override {
+    virtual void visit(AstNodeAssign* nodep) override {
         // It's nearly impossible to have a large enough assign to make this worthwhile
         // For now we won't bother.
         // Accelerated: no iterate
     }
-    virtual void visit(AstNode* nodep) override { iterateChildren(nodep); }
 
 public:
     // CONSTRUCTORS
diff --git a/src/Verilator.cpp b/src/Verilator.cpp
index 8b8605430..041a2705c 100644
--- a/src/Verilator.cpp
+++ b/src/Verilator.cpp
@@ -439,7 +439,7 @@ static void process() {
         // Make all math operations either 8, 16, 32 or 64 bits
         V3Clean::cleanAll(v3Global.rootp());
 
-        // Move wide constants to BLOCK temps.
+        // Move wide constants to BLOCK temps / ConstPool.
         V3Premit::premitAll(v3Global.rootp());
     }
 
@@ -499,6 +499,7 @@ static void process() {
         // emitcInlines is first, as it may set needHInlines which other emitters read
         V3EmitC::emitcInlines();
         V3EmitC::emitcSyms();
+        V3EmitC::emitcConstPool();
         V3EmitC::emitcTrace();
     } else if (v3Global.opt.dpiHdrOnly()) {
         V3EmitC::emitcSyms(true);
diff --git a/test_regress/t/t_extract_static_const.pl b/test_regress/t/t_extract_static_const.pl
index 63299d45f..1f112f083 100755
--- a/test_regress/t/t_extract_static_const.pl
+++ b/test_regress/t/t_extract_static_const.pl
@@ -19,12 +19,11 @@ execute(
     expect_filename => $Self->{golden_filename},
     );
 
-if ($Self->{vlt}) {
-    # Note, with vltmt this might be split differently, so only checking vlt
-    file_grep($Self->{stats}, qr/Optimizations, Prelim static constants extracted\s+(\d+)/i,
+if ($Self->{vlt_all}) {
+    file_grep($Self->{stats}, qr/Optimizations, Prelim extracted value to ConstPool\s+(\d+)/i,
+              8);
+    file_grep($Self->{stats}, qr/ConstPool, Constants emitted\s+(\d+)/i,
               1);
-    file_grep($Self->{stats}, qr/Optimizations, Prelim static constants reused\s+(\d+)/i,
-              7);
 }
 
 ok(1);
diff --git a/test_regress/t/t_extract_static_const.v b/test_regress/t/t_extract_static_const.v
index 9cda8a26c..2a49caced 100755
--- a/test_regress/t/t_extract_static_const.v
+++ b/test_regress/t/t_extract_static_const.v
@@ -6,25 +6,35 @@
 
 module t (/*AUTOARG*/);
 
-   wire [255:0] C = {32'h1111_1111,
-                     32'h2222_2222,
-                     32'h3333_3333,
-                     32'h4444_4444,
-                     32'h5555_5555,
-                     32'h6666_6666,
-                     32'h7777_7777,
-                     32'h8888_8888};
+   wire bit   [255:0] C = {32'h1111_1111,
+                           32'h2222_2222,
+                           32'h3333_3333,
+                           32'h4444_4444,
+                           32'h5555_5555,
+                           32'h6666_6666,
+                           32'h7777_7777,
+                           32'h8888_8888};
+
+   // Same values as above, but with different type
+   wire logic [255:0] D = {32'h1111_1111,
+                           32'h2222_2222,
+                           32'h3333_3333,
+                           32'h4444_4444,
+                           32'h5555_5555,
+                           32'h6666_6666,
+                           32'h7777_7777,
+                           32'h8888_8888};
 
    initial begin
       // Note: Base index via $c to prevent optimizatoin by Verilator
       $display("0x%32x", C[$c(0*32)+:32]);
-      $display("0x%32x", C[$c(1*32)+:32]);
+      $display("0x%32x", D[$c(1*32)+:32]);
       $display("0x%32x", C[$c(2*32)+:32]);
-      $display("0x%32x", C[$c(3*32)+:32]);
+      $display("0x%32x", D[$c(3*32)+:32]);
       $display("0x%32x", C[$c(4*32)+:32]);
-      $display("0x%32x", C[$c(5*32)+:32]);
+      $display("0x%32x", D[$c(5*32)+:32]);
       $display("0x%32x", C[$c(6*32)+:32]);
-      $display("0x%32x", C[$c(7*32)+:32]);
+      $display("0x%32x", D[$c(7*32)+:32]);
       $write("*-* All Finished *-*\n");
       $finish;
    end
diff --git a/test_regress/t/t_extract_static_const_multimodule.pl b/test_regress/t/t_extract_static_const_multimodule.pl
index 6767e6bcc..1f112f083 100755
--- a/test_regress/t/t_extract_static_const_multimodule.pl
+++ b/test_regress/t/t_extract_static_const_multimodule.pl
@@ -19,12 +19,11 @@ execute(
     expect_filename => $Self->{golden_filename},
     );
 
-if ($Self->{vlt}) {
-    # Note, with vltmt this might be split differently, so only checking vlt
-    file_grep($Self->{stats}, qr/Optimizations, Prelim static constants extracted\s+(\d+)/i,
-              2);
-    file_grep($Self->{stats}, qr/Optimizations, Prelim static constants reused\s+(\d+)/i,
-              6);
+if ($Self->{vlt_all}) {
+    file_grep($Self->{stats}, qr/Optimizations, Prelim extracted value to ConstPool\s+(\d+)/i,
+              8);
+    file_grep($Self->{stats}, qr/ConstPool, Constants emitted\s+(\d+)/i,
+              1);
 }
 
 ok(1);
diff --git a/test_regress/t/t_extract_static_const_no_merge.pl b/test_regress/t/t_extract_static_const_no_merge.pl
new file mode 100755
index 000000000..ff9a694d4
--- /dev/null
+++ b/test_regress/t/t_extract_static_const_no_merge.pl
@@ -0,0 +1,33 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you can
+# redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(vlt_all => 1);
+
+top_filename("t/t_extract_static_const.v");
+golden_filename("t/t_extract_static_const.out");
+
+compile(
+    verilator_flags2 => ["--stats", "--no-merge-const-pool"],
+    );
+
+execute(
+    check_finished => 1,
+    expect_filename => $Self->{golden_filename},
+    );
+
+if ($Self->{vlt_all}) {
+    file_grep($Self->{stats}, qr/Optimizations, Prelim extracted value to ConstPool\s+(\d+)/i,
+              8);
+    file_grep($Self->{stats}, qr/ConstPool, Constants emitted\s+(\d+)/i,
+              2);
+}
+
+ok(1);
+1;
diff --git a/test_regress/t/t_opt_table_enum.out b/test_regress/t/t_opt_table_enum.out
new file mode 100644
index 000000000..40821f577
--- /dev/null
+++ b/test_regress/t/t_opt_table_enum.out
@@ -0,0 +1,9 @@
+cyle 0 =           0
+cyle 1 =           1
+cyle 2 =           2
+cyle 3 =          99
+cyle 4 =           4
+cyle 5 =           5
+cyle 6 =          99
+cyle 7 =          99
+*-* All Finished *-*
diff --git a/test_regress/t/t_opt_table_enum.pl b/test_regress/t/t_opt_table_enum.pl
new file mode 100755
index 000000000..a3f38c7f6
--- /dev/null
+++ b/test_regress/t/t_opt_table_enum.pl
@@ -0,0 +1,28 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+compile(
+    verilator_flags2 => ["--stats"],
+    );
+
+if ($Self->{vlt_all}) {
+    file_grep($Self->{stats}, qr/Optimizations, Tables created\s+(\d+)/i, 1);
+    file_grep($Self->{stats}, qr/ConstPool, Tables emitted\s+(\d+)/i, 1);
+}
+
+execute(
+    check_finished => 1,
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_opt_table_enum.v b/test_regress/t/t_opt_table_enum.v
new file mode 100644
index 000000000..538cf3bea
--- /dev/null
+++ b/test_regress/t/t_opt_table_enum.v
@@ -0,0 +1,45 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2021 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t (/*AUTOARG*/
+   // Inputs
+   clk
+   );
+   input clk;
+
+   enum  {
+          CASE_0 = 0,
+          CASE_1 = 1,
+          CASE_2 = 2,
+          CASE_4 = 4,
+          CASE_5 = 5,
+          DEFAULT = 99
+          } e;
+
+   reg [2:0] cyc;
+
+   initial cyc = 0;
+   always @(posedge clk) cyc <= cyc + 1;
+
+   always @* begin
+      case (cyc)
+        3'b000: e = CASE_0;
+        3'b001: e = CASE_1;
+        3'b010: e = CASE_2;
+        3'b100: e = CASE_4;
+        3'b101: e = CASE_5;
+        default: e = DEFAULT;
+      endcase
+   end
+
+   always @(posedge clk) begin
+      $display("cyle %d = %d", cyc, e);
+      if (cyc == 7) begin
+         $write("*-* All Finished *-*\n");
+         $finish;
+      end
+   end
+endmodule
diff --git a/test_regress/t/t_opt_table_packed_array.out b/test_regress/t/t_opt_table_packed_array.out
new file mode 100644
index 000000000..af1c46563
--- /dev/null
+++ b/test_regress/t/t_opt_table_packed_array.out
@@ -0,0 +1,9 @@
+cyle 0 = {  3,  2,  1,  0 }
+cyle 1 = {  4,  3,  2,  1 }
+cyle 2 = {  5,  4,  3,  4 }
+cyle 3 = { 15, 15, 15, 15 }
+cyle 4 = {  7,  6,  5,  4 }
+cyle 5 = {  8,  7,  6,  5 }
+cyle 6 = { 15, 15, 15, 15 }
+cyle 7 = { 15, 15, 15, 15 }
+*-* All Finished *-*
diff --git a/test_regress/t/t_opt_table_packed_array.pl b/test_regress/t/t_opt_table_packed_array.pl
new file mode 100755
index 000000000..a3f38c7f6
--- /dev/null
+++ b/test_regress/t/t_opt_table_packed_array.pl
@@ -0,0 +1,28 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+compile(
+    verilator_flags2 => ["--stats"],
+    );
+
+if ($Self->{vlt_all}) {
+    file_grep($Self->{stats}, qr/Optimizations, Tables created\s+(\d+)/i, 1);
+    file_grep($Self->{stats}, qr/ConstPool, Tables emitted\s+(\d+)/i, 1);
+}
+
+execute(
+    check_finished => 1,
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_opt_table_packed_array.v b/test_regress/t/t_opt_table_packed_array.v
new file mode 100644
index 000000000..9cd2d5508
--- /dev/null
+++ b/test_regress/t/t_opt_table_packed_array.v
@@ -0,0 +1,38 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2021 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t (/*AUTOARG*/
+   // Inputs
+   clk
+   );
+   input clk;
+
+   logic [3:0][3:0] a;
+
+   reg [2:0]        cyc;
+
+   initial cyc = 0;
+   always @(posedge clk) cyc <= cyc + 1;
+
+   always @* begin
+      case (cyc)
+        3'b000: a = {4'd0, 4'd1, 4'd2, 4'd3};
+        3'b001: a = {4'd1, 4'd2, 4'd3, 4'd4};
+        3'b010: a = {4'd4, 4'd3, 4'd4, 4'd5};
+        3'b100: a = {4'd4, 4'd5, 4'd6, 4'd7};
+        3'b101: a = {4'd5, 4'd6, 4'd7, 4'd8};
+        default: a = {4{4'hf}};
+      endcase
+   end
+
+   always @(posedge clk) begin
+      $display("cyle %d = { %d, %d, %d, %d }", cyc, a[0], a[1], a[2], a[3]);
+      if (cyc == 7) begin
+         $write("*-* All Finished *-*\n");
+         $finish;
+      end
+   end
+endmodule
diff --git a/test_regress/t/t_opt_table_same.out b/test_regress/t/t_opt_table_same.out
new file mode 100644
index 000000000..60045dcc7
--- /dev/null
+++ b/test_regress/t/t_opt_table_same.out
@@ -0,0 +1,9 @@
+cyle 0 =           0           0
+cyle 1 =           1           1
+cyle 2 =           2           2
+cyle 3 =          99          99
+cyle 4 =           4           4
+cyle 5 =           5           5
+cyle 6 =          99          99
+cyle 7 =          99          99
+*-* All Finished *-*
diff --git a/test_regress/t/t_opt_table_same.pl b/test_regress/t/t_opt_table_same.pl
new file mode 100755
index 000000000..2fc8ef4eb
--- /dev/null
+++ b/test_regress/t/t_opt_table_same.pl
@@ -0,0 +1,28 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+compile(
+    verilator_flags2 => ["--stats"],
+    );
+
+if ($Self->{vlt_all}) {
+    file_grep($Self->{stats}, qr/Optimizations, Tables created\s+(\d+)/i, 2);
+    file_grep($Self->{stats}, qr/ConstPool, Tables emitted\s+(\d+)/i, 1);
+}
+
+execute(
+    check_finished => 1,
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_opt_table_same.v b/test_regress/t/t_opt_table_same.v
new file mode 100644
index 000000000..c2317dce0
--- /dev/null
+++ b/test_regress/t/t_opt_table_same.v
@@ -0,0 +1,51 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2021 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t (/*AUTOARG*/
+   // Inputs
+   clk
+   );
+   input clk;
+
+   int   i;
+   int   j;
+
+   reg [2:0] cyc;
+
+   initial cyc = 0;
+   always @(posedge clk) cyc <= cyc + 1;
+
+   always @* begin
+      case (cyc)
+        3'b000: i = 0;
+        3'b001: i = 1;
+        3'b010: i = 2;
+        3'b100: i = 4;
+        3'b101: i = 5;
+        default: i = 99;
+      endcase
+   end
+
+   // Equivalent to above
+   always @* begin
+      case (cyc)
+        3'b101: j = 5;
+        3'b100: j = 4;
+        3'b010: j = 2;
+        3'b001: j = 1;
+        3'b000: j = 0;
+        default: j = 99;
+      endcase
+   end
+
+   always @(posedge clk) begin
+      $display("cyle %d = %d %d", cyc, i, j);
+      if (cyc == 7) begin
+         $write("*-* All Finished *-*\n");
+         $finish;
+      end
+   end
+endmodule
diff --git a/test_regress/t/t_opt_table_signed.out b/test_regress/t/t_opt_table_signed.out
new file mode 100644
index 000000000..ab242a34a
--- /dev/null
+++ b/test_regress/t/t_opt_table_signed.out
@@ -0,0 +1,9 @@
+cyle 0 =           0
+cyle 1 =          -1
+cyle 2 =           2
+cyle 3 = -2147483648
+cyle 4 =          -4
+cyle 5 =           5
+cyle 6 = -2147483648
+cyle 7 = -2147483648
+*-* All Finished *-*
diff --git a/test_regress/t/t_opt_table_signed.pl b/test_regress/t/t_opt_table_signed.pl
new file mode 100755
index 000000000..a3f38c7f6
--- /dev/null
+++ b/test_regress/t/t_opt_table_signed.pl
@@ -0,0 +1,28 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+compile(
+    verilator_flags2 => ["--stats"],
+    );
+
+if ($Self->{vlt_all}) {
+    file_grep($Self->{stats}, qr/Optimizations, Tables created\s+(\d+)/i, 1);
+    file_grep($Self->{stats}, qr/ConstPool, Tables emitted\s+(\d+)/i, 1);
+}
+
+execute(
+    check_finished => 1,
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_opt_table_signed.v b/test_regress/t/t_opt_table_signed.v
new file mode 100644
index 000000000..8dbd80a98
--- /dev/null
+++ b/test_regress/t/t_opt_table_signed.v
@@ -0,0 +1,38 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2021 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t (/*AUTOARG*/
+   // Inputs
+   clk
+   );
+   input clk;
+
+   int   i;
+
+   reg [2:0] cyc;
+
+   initial  cyc = 0;
+   always @(posedge clk) cyc <= cyc + 1;
+
+   always @* begin
+      case (cyc)
+        3'b000: i = 0;
+        3'b001: i = -1;
+        3'b010: i = 2;
+        3'b100: i = -4;
+        3'b101: i = 5;
+        default: i = -1 << 31;
+      endcase
+   end
+
+   always @(posedge clk) begin
+      $display("cyle %d = %d", cyc, i);
+      if (cyc == 7) begin
+         $write("*-* All Finished *-*\n");
+         $finish;
+      end
+   end
+endmodule
diff --git a/test_regress/t/t_opt_table_sparse.out b/test_regress/t/t_opt_table_sparse.out
new file mode 100644
index 000000000..c0e089a05
--- /dev/null
+++ b/test_regress/t/t_opt_table_sparse.out
@@ -0,0 +1,9 @@
+cyle 0 =           0
+cyle 1 =           1
+cyle 2 =           1
+cyle 3 =          99
+cyle 4 =           4
+cyle 5 =           5
+cyle 6 =          99
+cyle 7 =          99
+*-* All Finished *-*
diff --git a/test_regress/t/t_opt_table_sparse.pl b/test_regress/t/t_opt_table_sparse.pl
new file mode 100755
index 000000000..7a079bee2
--- /dev/null
+++ b/test_regress/t/t_opt_table_sparse.pl
@@ -0,0 +1,28 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+compile(
+    verilator_flags2 => ["--stats"],
+    );
+
+if ($Self->{vlt_all}) {
+    file_grep($Self->{stats}, qr/Optimizations, Tables created\s+(\d+)/i, 1);
+    file_grep($Self->{stats}, qr/ConstPool, Tables emitted\s+(\d+)/i, 2);
+}
+
+execute(
+    check_finished => 1,
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_opt_table_sparse.v b/test_regress/t/t_opt_table_sparse.v
new file mode 100644
index 000000000..3145d3c19
--- /dev/null
+++ b/test_regress/t/t_opt_table_sparse.v
@@ -0,0 +1,40 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2021 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t (/*AUTOARG*/
+   // Inputs
+   clk
+   );
+   input clk;
+
+   int   i;
+
+   reg [2:0] cyc;
+
+   initial cyc = 0;
+   always @(posedge clk) cyc <= cyc + 1;
+
+   /* verilator lint_off LATCH */
+   always @* begin
+      case (cyc)
+        3'b000: i = 0;
+        3'b001: i = 1;
+        3'b010: ; // unset
+        3'b100: i = 4;
+        3'b101: i = 5;
+        default: i = 99;
+      endcase
+   end
+   /* verilator lint_on LATCH */
+
+   always @(posedge clk) begin
+      $display("cyle %d = %d", cyc, i);
+      if (cyc == 7) begin
+         $write("*-* All Finished *-*\n");
+         $finish;
+      end
+   end
+endmodule
diff --git a/test_regress/t/t_opt_table_sparse_output_split.pl b/test_regress/t/t_opt_table_sparse_output_split.pl
new file mode 100755
index 000000000..a88e82fbd
--- /dev/null
+++ b/test_regress/t/t_opt_table_sparse_output_split.pl
@@ -0,0 +1,47 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+top_filename("t/t_opt_table_sparse.v");
+golden_filename("t/t_opt_table_sparse.out");
+
+compile(
+    verilator_flags2 => ["--stats", "--output-split 1"],
+    );
+
+if ($Self->{vlt_all}) {
+    file_grep($Self->{stats}, qr/Optimizations, Tables created\s+(\d+)/i, 1);
+    file_grep($Self->{stats}, qr/ConstPool, Tables emitted\s+(\d+)/i, 2);
+}
+
+# Splitting should set VM_PARALLEL_BUILDS to 1 by default
+file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}_classes.mk", qr/VM_PARALLEL_BUILDS\s*=\s*1/);
+
+check_splits(2);
+
+execute(
+    check_finished => 1,
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;
+
+sub check_splits {
+    my $expected = shift;
+    my $n;
+    foreach my $file (glob("$Self->{obj_dir}/*.cpp")) {
+        if ($file =~ /__ConstPool_/) {
+            $n += 1;
+        }
+    }
+    $n == $expected or error("__ConstPool*.cpp not split: $n");
+}
diff --git a/test_regress/t/t_opt_table_string.out b/test_regress/t/t_opt_table_string.out
new file mode 100644
index 000000000..08927201a
--- /dev/null
+++ b/test_regress/t/t_opt_table_string.out
@@ -0,0 +1,9 @@
+cyle 0 = case-0
+cyle 1 = case-1
+cyle 2 = case-2
+cyle 3 = default
+cyle 4 = case-4
+cyle 5 = case-5
+cyle 6 = default
+cyle 7 = default
+*-* All Finished *-*
diff --git a/test_regress/t/t_opt_table_string.pl b/test_regress/t/t_opt_table_string.pl
new file mode 100755
index 000000000..a3f38c7f6
--- /dev/null
+++ b/test_regress/t/t_opt_table_string.pl
@@ -0,0 +1,28 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+compile(
+    verilator_flags2 => ["--stats"],
+    );
+
+if ($Self->{vlt_all}) {
+    file_grep($Self->{stats}, qr/Optimizations, Tables created\s+(\d+)/i, 1);
+    file_grep($Self->{stats}, qr/ConstPool, Tables emitted\s+(\d+)/i, 1);
+}
+
+execute(
+    check_finished => 1,
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_opt_table_string.v b/test_regress/t/t_opt_table_string.v
new file mode 100644
index 000000000..11c6999ea
--- /dev/null
+++ b/test_regress/t/t_opt_table_string.v
@@ -0,0 +1,37 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2021 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t (/*AUTOARG*/
+   // Inputs
+   clk
+   );
+   input clk;
+
+   string s;
+   reg [2:0] cyc;
+
+   initial cyc = 0;
+   always @(posedge clk) cyc <= cyc + 1;
+
+   always @* begin
+      case (cyc)
+        3'b000: s = "case-0";
+        3'b001: s = "case-1";
+        3'b010: s = "case-2";
+        3'b100: s = "case-4";
+        3'b101: s = "case-5";
+        default: s = "default";
+      endcase
+   end
+
+   always @(posedge clk) begin
+      $display("cyle %d = %s", cyc, s);
+      if (cyc == 7) begin
+         $write("*-* All Finished *-*\n");
+         $finish;
+      end
+   end
+endmodule
diff --git a/test_regress/t/t_opt_table_struct.out b/test_regress/t/t_opt_table_struct.out
new file mode 100644
index 000000000..c6a0b57b7
--- /dev/null
+++ b/test_regress/t/t_opt_table_struct.out
@@ -0,0 +1,9 @@
+cyle 0 = {          0,     1,   2 }
+cyle 1 = {          1,     2,   3 }
+cyle 2 = {          2,     3,   4 }
+cyle 3 = {          0,     0,   0 }
+cyle 4 = {          4,     5,   6 }
+cyle 5 = {          5,     6,   7 }
+cyle 6 = {          0,     0,   0 }
+cyle 7 = {          0,     0,   0 }
+*-* All Finished *-*
diff --git a/test_regress/t/t_opt_table_struct.pl b/test_regress/t/t_opt_table_struct.pl
new file mode 100755
index 000000000..a3f38c7f6
--- /dev/null
+++ b/test_regress/t/t_opt_table_struct.pl
@@ -0,0 +1,28 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+compile(
+    verilator_flags2 => ["--stats"],
+    );
+
+if ($Self->{vlt_all}) {
+    file_grep($Self->{stats}, qr/Optimizations, Tables created\s+(\d+)/i, 1);
+    file_grep($Self->{stats}, qr/ConstPool, Tables emitted\s+(\d+)/i, 1);
+}
+
+execute(
+    check_finished => 1,
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_opt_table_struct.v b/test_regress/t/t_opt_table_struct.v
new file mode 100644
index 000000000..f27f1eef6
--- /dev/null
+++ b/test_regress/t/t_opt_table_struct.v
@@ -0,0 +1,42 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2021 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t (/*AUTOARG*/
+   // Inputs
+   clk
+   );
+   input clk;
+
+   struct packed {
+      bit [31:0] a;
+      bit [15:0] b;
+      bit [ 7:0] c;
+   } s;
+
+   reg [2:0]     cyc;
+
+   initial cyc = 0;
+   always @(posedge clk) cyc <= cyc + 1;
+
+   always @* begin
+      case (cyc)
+        3'b000: s = {32'd0, 16'd1, 8'd2};
+        3'b001: s = {32'd1, 16'd2, 8'd3};
+        3'b010: s = {32'd2, 16'd3, 8'd4};
+        3'b100: s = {32'd4, 16'd5, 8'd6};
+        3'b101: s = {32'd5, 16'd6, 8'd7};
+        default: s = '0;
+      endcase
+   end
+
+   always @(posedge clk) begin
+      $display("cyle %d = { %d, %d, %d }", cyc, s.a, s.b, s.c);
+      if (cyc == 7) begin
+         $write("*-* All Finished *-*\n");
+         $finish;
+      end
+   end
+endmodule

From 7280307a39bc9e8beebdeddf6920b9cc87bc18b1 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Thu, 10 Jun 2021 22:41:33 +0100
Subject: [PATCH 11/73] Implement DPI import/export as loose functions

---
 src/V3AstNodes.cpp               |   7 +-
 src/V3AstNodes.h                 |  30 ++---
 src/V3EmitC.cpp                  |  28 +++--
 src/V3EmitCBase.h                |  11 +-
 src/V3EmitCSyms.cpp              |  38 +++---
 src/V3Life.cpp                   |   2 +-
 src/V3Task.cpp                   | 194 +++++++++++++++++--------------
 src/V3Trace.cpp                  |   3 +-
 test_regress/t/t_dpi_dup_bad.out |   6 +-
 9 files changed, 177 insertions(+), 142 deletions(-)

diff --git a/src/V3AstNodes.cpp b/src/V3AstNodes.cpp
index 22bfd5a85..4160df3e1 100644
--- a/src/V3AstNodes.cpp
+++ b/src/V3AstNodes.cpp
@@ -1843,9 +1843,10 @@ void AstCFunc::dump(std::ostream& str) const {
     } else if (isStatic().trueUnknown()) {
         str << " [STATIC]";
     }
-    if (dpiImport()) str << " [DPII]";
-    if (dpiExport()) str << " [DPIX]";
-    if (dpiExportWrapper()) str << " [DPIXWR]";
+    if (dpiExportDispatcher()) str << " [DPIED]";
+    if (dpiExportImpl()) str << " [DPIEI]";
+    if (dpiImportPrototype()) str << " [DPIIP]";
+    if (dpiImportWrapper()) str << " [DPIIW]";
     if (isConstructor()) str << " [CTOR]";
     if (isDestructor()) str << " [DTOR]";
     if (isVirtual()) str << " [VIRT]";
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index 2ee8a64db..67b424aae 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -8749,10 +8749,10 @@ private:
     bool m_isVirtual : 1;  // Virtual function
     bool m_entryPoint : 1;  // User may call into this top level function
     bool m_pure : 1;  // Pure function
-    bool m_dpiExport : 1;  // From dpi export
-    bool m_dpiExportWrapper : 1;  // From dpi export; static function with dispatch table
-    bool m_dpiImport : 1;  // From dpi import
-    bool m_dpiImportWrapper : 1;  // Wrapper from dpi import
+    bool m_dpiExportDispatcher : 1;  // This is the DPI export entry point (i.e.: called by user)
+    bool m_dpiExportImpl : 1;  // DPI export implementation (called from DPI dispatcher via lookup)
+    bool m_dpiImportPrototype : 1;  // This is the DPI import prototype (i.e.: provided by user)
+    bool m_dpiImportWrapper : 1;  // Wrapper for invoking DPI import prototype from generated code
 public:
     AstCFunc(FileLine* fl, const string& name, AstScope* scopep, const string& rtnType = "")
         : ASTGEN_SUPER_CFunc(fl) {
@@ -8775,9 +8775,9 @@ public:
         m_isVirtual = false;
         m_entryPoint = false;
         m_pure = false;
-        m_dpiExport = false;
-        m_dpiExportWrapper = false;
-        m_dpiImport = false;
+        m_dpiExportDispatcher = false;
+        m_dpiExportImpl = false;
+        m_dpiImportPrototype = false;
         m_dpiImportWrapper = false;
     }
     ASTNODE_NODE_FUNCS(CFunc)
@@ -8793,11 +8793,11 @@ public:
         return ((funcType() == asamep->funcType()) && (rtnTypeVoid() == asamep->rtnTypeVoid())
                 && (argTypes() == asamep->argTypes()) && (ctorInits() == asamep->ctorInits())
                 && isLoose() == asamep->isLoose()
-                && (!(dpiImport() || dpiExport()) || name() == asamep->name()));
+                && (!(dpiImportPrototype() || dpiExportImpl()) || name() == asamep->name()));
     }
     //
     virtual void name(const string& name) override { m_name = name; }
-    virtual int instrCount() const override { return dpiImport() ? instrCountDpi() : 0; }
+    virtual int instrCount() const override { return dpiImportPrototype() ? instrCountDpi() : 0; }
     VBoolOrUnknown isConst() const { return m_isConst; }
     void isConst(bool flag) { m_isConst.setTrueOrFalse(flag); }
     void isConst(VBoolOrUnknown flag) { m_isConst = flag; }
@@ -8845,12 +8845,12 @@ public:
     void entryPoint(bool flag) { m_entryPoint = flag; }
     bool pure() const { return m_pure; }
     void pure(bool flag) { m_pure = flag; }
-    bool dpiExport() const { return m_dpiExport; }
-    void dpiExport(bool flag) { m_dpiExport = flag; }
-    bool dpiExportWrapper() const { return m_dpiExportWrapper; }
-    void dpiExportWrapper(bool flag) { m_dpiExportWrapper = flag; }
-    bool dpiImport() const { return m_dpiImport; }
-    void dpiImport(bool flag) { m_dpiImport = flag; }
+    bool dpiExportDispatcher() const { return m_dpiExportDispatcher; }
+    void dpiExportDispatcher(bool flag) { m_dpiExportDispatcher = flag; }
+    bool dpiExportImpl() const { return m_dpiExportImpl; }
+    void dpiExportImpl(bool flag) { m_dpiExportImpl = flag; }
+    bool dpiImportPrototype() const { return m_dpiImportPrototype; }
+    void dpiImportPrototype(bool flag) { m_dpiImportPrototype = flag; }
     bool dpiImportWrapper() const { return m_dpiImportWrapper; }
     void dpiImportWrapper(bool flag) { m_dpiImportWrapper = flag; }
     //
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 7bfe41fe9..128ff512b 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -235,7 +235,7 @@ public:
 
         for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
             if (const AstCFunc* funcp = VN_CAST(nodep, CFunc)) {
-                if (funcp->dpiImport())  // DPI import functions are declared in __Dpi.h
+                if (funcp->dpiImportPrototype())  // DPI import prototypes are declared in __Dpi.h
                     continue;
                 if (funcp->isMethod() != inClassBody)  // Only methods go inside class
                     continue;
@@ -388,6 +388,9 @@ public:
             iterate(ccallp->fromp());
             putbs("->");
             puts(funcp->nameProtect());
+        } else if (funcp->dpiImportPrototype()) {
+            // Calling DPI import
+            puts(funcp->name());
         } else if (funcp->isProperMethod() && funcp->isStatic().trueUnknown()) {
             // Call static method via the containing class
             AstNodeModule* modp = VN_CAST(funcp->user4p(), NodeModule);
@@ -1395,10 +1398,15 @@ class EmitCLazyDecls final : public AstNVisitor {
     bool m_needsBlankLine = false;  // Emit blank line if any declarations were emitted (cosmetic)
 
     void lazyDeclare(AstCFunc* funcp) {
-        if (funcp->user2SetOnce()) return;  // Already declared
-        if (!funcp->isMethod() || !funcp->isLoose()) return;  // Not lazily declared
-        if (m_emittedManually.count(funcp->nameProtect())) return;  // Already declared manually
-        m_emitter.emitCFuncDecl(funcp, VN_CAST_CONST(funcp->user4p(), NodeModule));
+        // Already declared in this compilation unit
+        if (funcp->user2SetOnce()) return;
+        // Check if this kind of function is lazily declared
+        if (!(funcp->isMethod() && funcp->isLoose()) && !funcp->dpiImportPrototype()) return;
+        // Already declared manually
+        if (m_emittedManually.count(funcp->nameProtect())) return;
+        // Needs lazy declaration, emit one
+        m_emitter.emitCFuncDecl(funcp, VN_CAST_CONST(funcp->user4p(), NodeModule),
+                                funcp->dpiImportPrototype());
         m_needsBlankLine = true;
     }
 
@@ -1659,7 +1667,7 @@ class EmitCImp final : EmitCStmts {
     virtual void visit(AstCFunc* nodep) override {
         // TRACE_* and DPI handled elsewhere
         if (nodep->funcType().isTrace()) return;
-        if (nodep->dpiImport()) return;
+        if (nodep->dpiImportPrototype()) return;
         if (!(nodep->slow() ? m_slow : m_fast)) return;
 
         VL_RESTORER(m_useSelfForThis);
@@ -2009,7 +2017,7 @@ class EmitCImp final : EmitCStmts {
     void emitWrapFast();
     void emitMTaskState();
     void emitMTaskVertexCtors(bool* firstp);
-    void emitIntTop(AstNodeModule* modp);
+    void emitIntTop(const AstNodeModule* modp);
     void emitInt(AstNodeModule* modp);
     void maybeSplit();
 
@@ -3274,7 +3282,7 @@ void EmitCImp::emitMTaskState() {
     puts("bool __Vm_even_cycle;\n");
 }
 
-void EmitCImp::emitIntTop(AstNodeModule*) {
+void EmitCImp::emitIntTop(const AstNodeModule* modp) {
     // Always have this first; gcc has short circuiting if #ifdef is first in a file
     ofp()->putsGuard();
     puts("\n");
@@ -3288,10 +3296,10 @@ void EmitCImp::emitIntTop(AstNodeModule*) {
     if (v3Global.opt.mtasks()) puts("#include \"verilated_threads.h\"\n");
     if (v3Global.opt.savable()) puts("#include \"verilated_save.h\"\n");
     if (v3Global.opt.coverage()) puts("#include \"verilated_cov.h\"\n");
-    if (v3Global.dpi()) {
+    if (v3Global.dpi() && modp->isTop()) {
         // do this before including our main .h file so that any references to
         // types defined in svdpi.h are available
-        puts("#include \"" + topClassName() + "__Dpi.h\"\n");
+        puts("#include \"svdpi.h\"\n");
     }
 }
 
diff --git a/src/V3EmitCBase.h b/src/V3EmitCBase.h
index 4a82b6c81..b125e180c 100644
--- a/src/V3EmitCBase.h
+++ b/src/V3EmitCBase.h
@@ -58,8 +58,8 @@ public:
     static string symClassAssign() {
         return symClassName() + "* const __restrict vlSymsp VL_ATTR_UNUSED = vlSelf->vlSymsp;\n";
     }
-    static string funcNameProtect(const AstCFunc* nodep) {
-        AstNodeModule* modp = VN_CAST(nodep->user4p(), NodeModule);
+    static string funcNameProtect(const AstCFunc* nodep, const AstNodeModule* modp = nullptr) {
+        modp = modp ? modp : VN_CAST(nodep->user4p(), NodeModule);
         string name;
         if (nodep->isConstructor()) {
             name += prefixNameProtect(modp);
@@ -116,7 +116,7 @@ public:
             if (const AstVar* portp = VN_CAST_CONST(stmtp, Var)) {
                 if (portp->isIO() && !portp->isFuncReturn()) {
                     if (args != "") args += ", ";
-                    if (nodep->dpiImport() || nodep->dpiExportWrapper()) {
+                    if (nodep->dpiImportPrototype() || nodep->dpiExportDispatcher()) {
                         args += portp->dpiArgType(true, false);
                     } else if (nodep->funcPublic()) {
                         args += portp->cPubArgType(true, false);
@@ -135,14 +135,15 @@ public:
             puts(" ");
         }
         if (withScope && funcp->isProperMethod()) puts(prefixNameProtect(modp) + "::");
-        puts(funcNameProtect(funcp));
+        puts(funcNameProtect(funcp, modp));
         puts("(" + cFuncArgs(funcp) + ")");
         if (funcp->isConst().trueKnown() && funcp->isProperMethod()) puts(" const");
     }
 
-    void emitCFuncDecl(const AstCFunc* funcp, const AstNodeModule* modp) {
+    void emitCFuncDecl(const AstCFunc* funcp, const AstNodeModule* modp, bool cLinkage = false) {
         ensureNewLine();
         if (!funcp->ifdef().empty()) puts("#ifdef " + funcp->ifdef() + "\n");
+        if (cLinkage) puts("extern \"C\" ");
         if (funcp->isStatic().trueUnknown() && funcp->isProperMethod()) puts("static ");
         if (funcp->isVirtual()) {
             UASSERT_OBJ(funcp->isProperMethod(), funcp, "Virtual function is not a proper method");
diff --git a/src/V3EmitCSyms.cpp b/src/V3EmitCSyms.cpp
index a2f7142d1..f5d41845b 100644
--- a/src/V3EmitCSyms.cpp
+++ b/src/V3EmitCSyms.cpp
@@ -83,9 +83,9 @@ class EmitCSyms final : EmitCBaseVisitor {
     };
     struct CmpDpi {
         bool operator()(const AstCFunc* lhsp, const AstCFunc* rhsp) const {
-            if (lhsp->dpiImport() != rhsp->dpiImport()) {
+            if (lhsp->dpiImportPrototype() != rhsp->dpiImportPrototype()) {
                 // cppcheck-suppress comparisonOfFuncReturningBoolError
-                return lhsp->dpiImport() < rhsp->dpiImport();
+                return lhsp->dpiImportPrototype() < rhsp->dpiImportPrototype();
             }
             return lhsp->name() < rhsp->name();
         }
@@ -348,7 +348,7 @@ class EmitCSyms final : EmitCBaseVisitor {
     }
     virtual void visit(AstCFunc* nodep) override {
         nameCheck(nodep);
-        if (nodep->dpiImport() || nodep->dpiExportWrapper()) m_dpis.push_back(nodep);
+        if (nodep->dpiImportPrototype() || nodep->dpiExportDispatcher()) m_dpis.push_back(nodep);
         VL_RESTORER(m_cfuncp);
         {
             m_cfuncp = nodep;
@@ -407,7 +407,7 @@ void EmitCSyms::emitSymHdr() {
         std::map<const string, int> types;  // Remove duplicates and sort
         for (const auto& itr : m_scopeFuncs) {
             AstCFunc* funcp = itr.second.m_cfuncp;
-            if (funcp->dpiExport()) {
+            if (funcp->dpiExportImpl()) {
                 string cbtype = protect(v3Global.opt.prefix() + "__Vcb_" + funcp->cname() + "_t");
                 types["using " + cbtype + " = void (*) (" + cFuncArgs(funcp) + ");\n"] = 1;
             }
@@ -561,6 +561,16 @@ void EmitCSyms::emitSymImpPreamble() {
         if (VN_IS(nodep, Class)) continue;  // Class included earlier
         puts("#include \"" + prefixNameProtect(nodep) + ".h\"\n");
     }
+    puts("\n");
+    // Declarations for DPI Export implementation functions
+    bool needsNewLine = false;
+    for (const auto& pair : m_scopeFuncs) {
+        const AstCFunc* const funcp = pair.second.m_cfuncp;
+        if (!funcp->dpiExportImpl()) continue;
+        emitCFuncDecl(funcp, pair.second.m_modp);
+        needsNewLine = true;
+    }
+    if (needsNewLine) puts("\n");
 }
 
 void EmitCSyms::emitScopeHier(bool destroy) {
@@ -611,12 +621,7 @@ void EmitCSyms::emitSymImp() {
     m_ofpBase = m_ofp;
     emitSymImpPreamble();
 
-    // puts("\n// GLOBALS\n");
-
-    puts("\n");
-
     if (v3Global.opt.savable()) {
-        puts("\n");
         for (int de = 0; de < 2; ++de) {
             string classname = de ? "VerilatedDeserialize" : "VerilatedSerialize";
             string funcname = de ? "__Vdeserialize" : "__Vserialize";
@@ -640,11 +645,10 @@ void EmitCSyms::emitSymImp() {
             }
             puts("}\n");
         }
+        puts("\n");
     }
 
-    puts("\n");
-
-    puts("\n// FUNCTIONS\n");
+    puts("// FUNCTIONS\n");
     puts(symClassName() + "::~" + symClassName() + "()\n");
     puts("{\n");
     emitScopeHier(true);
@@ -743,13 +747,13 @@ void EmitCSyms::emitSymImp() {
             AstScopeName* scopep = it->second.m_scopep;
             AstCFunc* funcp = it->second.m_cfuncp;
             AstNodeModule* modp = it->second.m_modp;
-            if (funcp->dpiExport()) {
+            if (funcp->dpiExportImpl()) {
                 checkSplit(true);
                 puts(protect("__Vscope_" + scopep->scopeSymName()) + ".exportInsert(__Vfinal, ");
                 putsQuoted(funcp->cname());  // Not protected - user asked for import/export
                 puts(", (void*)(&");
                 puts(prefixNameProtect(modp));
-                puts("::");
+                puts("__");
                 puts(funcp->nameProtect());
                 puts("));\n");
                 ++m_numStmts;
@@ -886,13 +890,13 @@ void EmitCSyms::emitDpiHdr() {
     int firstExp = 0;
     int firstImp = 0;
     for (AstCFunc* nodep : m_dpis) {
-        if (nodep->dpiExportWrapper()) {
+        if (nodep->dpiExportDispatcher()) {
             if (!firstExp++) puts("\n// DPI EXPORTS\n");
             putsDecoration("// DPI export" + ifNoProtect(" at " + nodep->fileline()->ascii())
                            + "\n");
             puts("extern " + nodep->rtnTypeVoid() + " " + nodep->nameProtect() + "("
                  + cFuncArgs(nodep) + ");\n");
-        } else if (nodep->dpiImport()) {
+        } else if (nodep->dpiImportPrototype()) {
             if (!firstImp++) puts("\n// DPI IMPORTS\n");
             putsDecoration("// DPI import" + ifNoProtect(" at " + nodep->fileline()->ascii())
                            + "\n");
@@ -937,7 +941,7 @@ void EmitCSyms::emitDpiImp() {
     puts("\n");
 
     for (AstCFunc* nodep : m_dpis) {
-        if (nodep->dpiExportWrapper()) {
+        if (nodep->dpiExportDispatcher()) {
             // Prevent multi-definition if used by multiple models
             puts("#ifndef VL_DPIDECL_" + nodep->name() + "_\n");
             puts("#define VL_DPIDECL_" + nodep->name() + "_\n");
diff --git a/src/V3Life.cpp b/src/V3Life.cpp
index 2b7dc0541..24c6866a6 100644
--- a/src/V3Life.cpp
+++ b/src/V3Life.cpp
@@ -414,7 +414,7 @@ private:
         // UINFO(4, "  CFUNC " << nodep << endl);
         if (!m_tracingCall && !nodep->entryPoint()) return;
         m_tracingCall = false;
-        if (nodep->dpiImport() && !nodep->pure()) {
+        if (nodep->dpiImportPrototype() && !nodep->pure()) {
             m_sideEffect = true;  // If appears on assign RHS, don't ever delete the assignment
         }
         iterateChildren(nodep);
diff --git a/src/V3Task.cpp b/src/V3Task.cpp
index 99dc0a04c..963a1bc7a 100644
--- a/src/V3Task.cpp
+++ b/src/V3Task.cpp
@@ -35,6 +35,7 @@
 #include "V3LinkLValue.h"
 
 #include <map>
+#include <tuple>
 
 //######################################################################
 // Graph subclasses
@@ -384,7 +385,7 @@ private:
         IM_AFTER,  // Pointing at last inserted stmt, insert after
         IM_WHILE_PRECOND  // Pointing to for loop, add to body end
     };
-    using DpiNames = std::map<const string, std::pair<AstNodeFTask*, std::string>>;
+    using DpiCFuncs = std::map<const string, std::tuple<AstNodeFTask*, std::string, AstCFunc*>>;
 
     // STATE
     TaskStateVisitor* m_statep;  // Common state between visitors
@@ -394,7 +395,7 @@ private:
     InsertMode m_insMode = IM_BEFORE;  // How to insert
     AstNode* m_insStmtp = nullptr;  // Where to insert statement
     int m_modNCalls = 0;  // Incrementing func # for making symbols
-    DpiNames m_dpiNames;  // Map of all created DPI functions
+    DpiCFuncs m_dpiNames;  // Map of all created DPI functions
 
     // METHODS
     VL_DEBUG_FUNC;  // Declare debug()
@@ -658,9 +659,9 @@ private:
         return beginp;
     }
 
-    string dpiprotoName(AstNodeFTask* nodep, AstVar* rtnvarp) const {
-        // Return fancy export-ish name for DPI function
-        // Variable names are NOT included so differences in only IO names won't matter
+    string dpiSignature(AstNodeFTask* nodep, AstVar* rtnvarp) const {
+        // Return fancy signature for DPI function. Variable names are not included so differences
+        // in only argument names will not matter (as required by the standard).
         string dpiproto;
         if (nodep->pure()) dpiproto += "pure ";
         if (nodep->dpiContext()) dpiproto += "context ";
@@ -757,18 +758,18 @@ private:
         return newp;
     }
 
-    void makeDpiExportWrapper(AstNodeFTask* nodep, AstVar* rtnvarp) {
+    AstCFunc* makeDpiExportDispatcher(AstNodeFTask* nodep, AstVar* rtnvarp) {
         const char* const tmpSuffixp = V3Task::dpiTemporaryVarSuffix();
-        AstCFunc* dpip = new AstCFunc(nodep->fileline(), nodep->cname(), m_scopep,
-                                      (rtnvarp ? rtnvarp->dpiArgType(true, true) : ""));
-        dpip->dontCombine(true);
-        dpip->entryPoint(true);
-        dpip->isStatic(true);
-        dpip->dpiExportWrapper(true);
-        dpip->protect(false);
-        dpip->cname(nodep->cname());
-        // Add DPI reference to top, since it's a global function
-        m_topScopep->scopep()->addActivep(dpip);
+        AstCFunc* const funcp = new AstCFunc(nodep->fileline(), nodep->cname(), m_scopep,
+                                             (rtnvarp ? rtnvarp->dpiArgType(true, true) : ""));
+        funcp->dpiExportDispatcher(true);
+        funcp->dontCombine(true);
+        funcp->entryPoint(true);
+        funcp->isStatic(true);
+        funcp->protect(false);
+        funcp->cname(nodep->cname());
+        // Add DPI Export to top, since it's a global function
+        m_topScopep->scopep()->addActivep(funcp);
 
         {  // Create dispatch wrapper
             // Note this function may dispatch to myfunc on a different class.
@@ -795,7 +796,7 @@ private:
                     + ")(VerilatedScope::exportFind(__Vscopep, __Vfuncnum));\n";  // Can't use
                                                                                   // static_cast
             // If __Vcb is null the exportFind function throws and error
-            dpip->addStmtsp(new AstCStmt(nodep->fileline(), stmt));
+            funcp->addStmtsp(new AstCStmt(nodep->fileline(), stmt));
         }
 
         // Convert input/inout DPI arguments to Internal types
@@ -813,7 +814,7 @@ private:
                         argnodesp = argnodesp->addNext(new AstText(portp->fileline(), args, true));
                         args = "";
                     }
-                    AstVarScope* outvscp = createFuncVar(dpip, portp->name() + tmpSuffixp, portp);
+                    AstVarScope* outvscp = createFuncVar(funcp, portp->name() + tmpSuffixp, portp);
                     // No information exposure; is already visible in import/export func template
                     outvscp->varp()->protect(false);
                     portp->protect(false);
@@ -829,7 +830,7 @@ private:
                                   ? "*"
                                   : "";
                         frName += portp->name();
-                        dpip->addStmtsp(createAssignDpiToInternal(outvscp, frName));
+                        funcp->addStmtsp(createAssignDpiToInternal(outvscp, frName));
                     }
                 }
             }
@@ -843,7 +844,7 @@ private:
                 argnodesp = argnodesp->addNext(new AstText(portp->fileline(), args, true));
                 args = "";
             }
-            AstVarScope* outvscp = createFuncVar(dpip, portp->name() + tmpSuffixp, portp);
+            AstVarScope* outvscp = createFuncVar(funcp, portp->name() + tmpSuffixp, portp);
             // No information exposure; is already visible in import/export func template
             outvscp->varp()->protect(false);
             AstVarRef* refp = new AstVarRef(portp->fileline(), outvscp,
@@ -859,69 +860,85 @@ private:
             newp->addBodysp(argnodesp);
             VL_DANGLING(argnodesp);
             newp->addBodysp(new AstText(nodep->fileline(), args, true));
-            dpip->addStmtsp(newp);
+            funcp->addStmtsp(newp);
         }
 
         // Convert output/inout arguments back to internal type
         for (AstNode* stmtp = nodep->stmtsp(); stmtp; stmtp = stmtp->nextp()) {
             if (AstVar* portp = VN_CAST(stmtp, Var)) {
                 if (portp->isIO() && portp->isWritable() && !portp->isFuncReturn()) {
-                    dpip->addStmtsp(createAssignInternalToDpi(portp, true, tmpSuffixp, ""));
+                    funcp->addStmtsp(createAssignInternalToDpi(portp, true, tmpSuffixp, ""));
                 }
             }
         }
 
         if (rtnvarp) {
-            dpip->addStmtsp(createDpiTemp(rtnvarp, ""));
-            dpip->addStmtsp(createAssignInternalToDpi(rtnvarp, false, tmpSuffixp, ""));
+            funcp->addStmtsp(createDpiTemp(rtnvarp, ""));
+            funcp->addStmtsp(createAssignInternalToDpi(rtnvarp, false, tmpSuffixp, ""));
             string stmt = "return " + rtnvarp->name();
             stmt += rtnvarp->basicp()->isDpiPrimitive() ? ";\n" : "[0];\n";
-            dpip->addStmtsp(new AstCStmt(nodep->fileline(), stmt));
+            funcp->addStmtsp(new AstCStmt(nodep->fileline(), stmt));
         }
-        makePortList(nodep, dpip);
+        makePortList(nodep, funcp);
+        return funcp;
     }
 
-    void makeDpiImportProto(AstNodeFTask* nodep, AstVar* rtnvarp) {
+    AstCFunc* makeDpiImportPrototype(AstNodeFTask* nodep, AstVar* rtnvarp) {
         if (nodep->cname() != AstNode::prettyName(nodep->cname())) {
             nodep->v3error("DPI function has illegal characters in C identifier name: "
                            << AstNode::prettyNameQ(nodep->cname()));
         }
-        AstCFunc* dpip = new AstCFunc(nodep->fileline(), nodep->cname(), m_scopep,
-                                      (rtnvarp ? rtnvarp->dpiArgType(true, true)
-                                               // Tasks (but not void functions)
-                                               // return bool indicating disabled
-                                               : nodep->dpiTask() ? "int" : ""));
-        dpip->dontCombine(true);
-        dpip->entryPoint(false);
-        dpip->funcPublic(true);
-        dpip->isStatic(false);
-        dpip->protect(false);
-        dpip->pure(nodep->pure());
-        dpip->dpiImport(true);
-        // Add DPI reference to top, since it's a global function
-        m_topScopep->scopep()->addActivep(dpip);
-        makePortList(nodep, dpip);
+        // Tasks (but not void functions) return a boolean 'int' indicating disabled
+        const string rtnType
+            = rtnvarp ? rtnvarp->dpiArgType(true, true) : nodep->dpiTask() ? "int" : "";
+        AstCFunc* const funcp = new AstCFunc(nodep->fileline(), nodep->cname(), m_scopep, rtnType);
+        funcp->dpiImportPrototype(true);
+        funcp->dontCombine(true);
+        funcp->entryPoint(false);
+        funcp->isMethod(false);
+        funcp->protect(false);
+        funcp->pure(nodep->pure());
+        // Add DPI Import to top, since it's a global function
+        m_topScopep->scopep()->addActivep(funcp);
+        makePortList(nodep, funcp);
+        return funcp;
     }
 
-    bool duplicatedDpiProto(AstNodeFTask* nodep, const string& dpiproto) {
-        // Only create one DPI extern prototype for each specified cname
-        // as it's legal for the user to attach multiple tasks to one dpi cname
-        const auto iter = m_dpiNames.find(nodep->cname());
-        if (iter == m_dpiNames.end()) {
-            m_dpiNames.emplace(nodep->cname(), std::make_pair(nodep, dpiproto));
-            return false;
-        } else if (iter->second.second != dpiproto) {
-            nodep->v3error(
-                "Duplicate declaration of DPI function with different formal arguments: "
-                << nodep->prettyNameQ() << '\n'
-                << nodep->warnContextPrimary() << '\n'
-                << nodep->warnMore() << "... New prototype:      " << dpiproto << '\n'
-                << iter->second.first->warnOther()
-                << "... Original prototype: " << iter->second.second << '\n'
-                << iter->second.first->warnContextSecondary());
-            return true;
+    AstCFunc* getDpiFunc(AstNodeFTask* nodep, AstVar* rtnvarp) {
+        UASSERT_OBJ(nodep->dpiImport() || nodep->dpiExport(), nodep, "Not a DPI function");
+        // Compute unique signature of this DPI function
+        const string signature = dpiSignature(nodep, rtnvarp);
+        // Only create one DPI Import prototype or DPI Export entry point for each unique cname as
+        // it is illegal for the user to attach multiple tasks with different signatures to one DPI
+        // cname.
+        const auto it = m_dpiNames.find(nodep->cname());
+        if (it == m_dpiNames.end()) {
+            // First time encountering this cname. Create Import prototype / Export entry point
+            AstCFunc* const funcp = nodep->dpiExport() ? makeDpiExportDispatcher(nodep, rtnvarp)
+                                                       : makeDpiImportPrototype(nodep, rtnvarp);
+            m_dpiNames.emplace(nodep->cname(), std::make_tuple(nodep, signature, funcp));
+            return funcp;
         } else {
-            return true;
+            // Seen this cname before. Check if it's the same prototype.
+            const AstNodeFTask* firstNodep;
+            string firstSignature;
+            AstCFunc* firstFuncp;
+            std::tie(firstNodep, firstSignature, firstFuncp) = it->second;
+            if (signature != firstSignature) {
+                // Different signature, so error.
+                nodep->v3error("Duplicate declaration of DPI function with different signature: "
+                               << nodep->prettyNameQ() << '\n'
+                               << nodep->warnContextPrimary() << '\n'
+                               << nodep->warnMore()  //
+                               << "... New signature:      " << signature << '\n'  //
+                               << firstNodep->warnOther()
+                               << "... Original signature: " << firstSignature << '\n'  //
+                               << firstNodep->warnContextSecondary());
+                return nullptr;
+            } else {
+                // Same signature, return the previously created CFunc
+                return firstFuncp;
+            }
         }
     }
 
@@ -949,7 +966,8 @@ private:
         }
     }
 
-    void bodyDpiImportFunc(AstNodeFTask* nodep, AstVarScope* rtnvscp, AstCFunc* cfuncp) {
+    void bodyDpiImportFunc(AstNodeFTask* nodep, AstVarScope* rtnvscp, AstCFunc* cfuncp,
+                           AstCFunc* dpiFuncp) {
         const char* const tmpSuffixp = V3Task::dpiTemporaryVarSuffix();
         // Convert input/inout arguments to DPI types
         string args;
@@ -1010,15 +1028,17 @@ private:
             cfuncp->addStmtsp(new AstCStmt(nodep->fileline(), stmt));
         }
 
-        {  // Call the user function
-            string stmt;
+        {  // Call the imported function
             if (rtnvscp) {  // isFunction will no longer work as we unlinked the return var
                 cfuncp->addStmtsp(createDpiTemp(rtnvscp->varp(), tmpSuffixp));
-                stmt = rtnvscp->varp()->name() + tmpSuffixp;
+                string stmt = rtnvscp->varp()->name();
+                stmt += tmpSuffixp;
                 stmt += rtnvscp->varp()->basicp()->isDpiPrimitive() ? " = " : "[0] = ";
+                cfuncp->addStmtsp(new AstText(nodep->fileline(), stmt, /* tracking: */ true));
             }
-            stmt += nodep->cname() + "(" + args + ");\n";
-            cfuncp->addStmtsp(new AstCStmt(nodep->fileline(), stmt));
+            AstCCall* const callp = new AstCCall(nodep->fileline(), dpiFuncp);
+            callp->argTypes(args);
+            cfuncp->addStmtsp(callp);
         }
 
         // Convert output/inout arguments back to internal type
@@ -1080,23 +1100,19 @@ private:
             if (nodep->dpiImport() || nodep->dpiExport()) rtnvarp->protect(false);
         }
 
-        if (nodep->dpiImport()) {
-            if (nodep->dpiOpenChild()) {  // The parent will make the dpi proto
-                UASSERT_OBJ(!nodep->dpiOpenParent(), nodep,
-                            "DPI task should be parent or wrapper, not both");
-            } else {  // Parent or not open child, make wrapper
-                string dpiproto = dpiprotoName(nodep, rtnvarp);
-                if (!duplicatedDpiProto(nodep, dpiproto)) makeDpiImportProto(nodep, rtnvarp);
-                if (nodep->dpiOpenParent()) {
-                    // No need to make more than just the c prototype, children will
-                    VL_DO_DANGLING(pushDeletep(nodep), nodep);
-                    return nullptr;
-                }
+        // Create/pick up the DPI CFunc for DPI Import/ DPI Export.
+        AstCFunc* dpiFuncp = nullptr;
+        if (nodep->dpiImport() || nodep->dpiExport()) {
+            UASSERT_OBJ(!(nodep->dpiOpenParent() && nodep->dpiOpenChild()), nodep,
+                        "DPI task should not be both parent and child");
+            dpiFuncp = getDpiFunc(nodep, rtnvarp);
+            if (!dpiFuncp) return nullptr;  // There was an error, so bail
+            if (nodep->dpiImport() && nodep->dpiOpenParent()) {
+                // No need to make more than just the DPI Import prototype, the children will
+                // create the wrapper implementations.
+                VL_DO_DANGLING(pushDeletep(nodep), nodep);
+                return nullptr;
             }
-
-        } else if (nodep->dpiExport()) {
-            string dpiproto = dpiprotoName(nodep, rtnvarp);
-            if (!duplicatedDpiProto(nodep, dpiproto)) makeDpiExportWrapper(nodep, rtnvarp);
         }
 
         AstVarScope* rtnvscp = nullptr;
@@ -1127,9 +1143,14 @@ private:
         cfuncp->dontCombine(!nodep->dpiImport());
         cfuncp->entryPoint(!nodep->dpiImport());
         cfuncp->funcPublic(nodep->taskPublic());
-        cfuncp->dpiExport(nodep->dpiExport());
+        cfuncp->dpiExportImpl(nodep->dpiExport());
         cfuncp->dpiImportWrapper(nodep->dpiImport());
-        cfuncp->isStatic(nodep->dpiExport());
+        if (nodep->dpiImport() || nodep->dpiExport()) {
+            cfuncp->isStatic(true);
+            cfuncp->isLoose(true);
+        } else {
+            cfuncp->isStatic(false);
+        }
         cfuncp->isVirtual(nodep->isVirtual());
         cfuncp->pure(nodep->pure());
         if (nodep->name() == "new") {
@@ -1140,8 +1161,7 @@ private:
                                   + "(vlSymsp)");
             }
         }
-        // cfuncp->dpiImport   // Not set in the wrapper - the called function has it set
-        if (cfuncp->dpiExport()) cfuncp->cname(nodep->cname());
+        if (cfuncp->dpiExportImpl()) cfuncp->cname(nodep->cname());
 
         if (!nodep->dpiImport() && !nodep->taskPublic()) {
             // Need symbol table
@@ -1198,7 +1218,7 @@ private:
             bodysp->unlinkFrBackWithNext();
             cfuncp->addStmtsp(bodysp);
         }
-        if (nodep->dpiImport()) bodyDpiImportFunc(nodep, rtnvscp, cfuncp);
+        if (nodep->dpiImport()) bodyDpiImportFunc(nodep, rtnvscp, cfuncp, dpiFuncp);
 
         // Return statement
         if (rtnvscp && nodep->taskPublic()) {
diff --git a/src/V3Trace.cpp b/src/V3Trace.cpp
index 284add392..0982fbf79 100644
--- a/src/V3Trace.cpp
+++ b/src/V3Trace.cpp
@@ -834,7 +834,8 @@ private:
         V3GraphVertex* const funcVtxp = getCFuncVertexp(nodep);
         if (!m_finding) {  // If public, we need a unique activity code to allow for sets
                            // directly in this func
-            if (nodep->funcPublic() || nodep->dpiExport() || nodep == v3Global.rootp()->evalp()) {
+            if (nodep->funcPublic() || nodep->dpiExportImpl()
+                || nodep == v3Global.rootp()->evalp()) {
                 V3GraphVertex* const activityVtxp = getActivityVertexp(nodep, nodep->slow());
                 new V3GraphEdge(&m_graph, activityVtxp, funcVtxp, 1);
             }
diff --git a/test_regress/t/t_dpi_dup_bad.out b/test_regress/t/t_dpi_dup_bad.out
index 88cc02fe1..0450a8504 100644
--- a/test_regress/t/t_dpi_dup_bad.out
+++ b/test_regress/t/t_dpi_dup_bad.out
@@ -1,8 +1,8 @@
-%Error: t/t_dpi_dup_bad.v:13:51: Duplicate declaration of DPI function with different formal arguments: 't.oth_f_int2'
+%Error: t/t_dpi_dup_bad.v:13:51: Duplicate declaration of DPI function with different signature: 't.oth_f_int2'
    13 |    import "DPI-C" pure dpii_fa_bit = function int oth_f_int2(input int i, input int bad);
       |                                                   ^~~~~~~~~~
-                               : ... New prototype:      pure int dpii_fa_bit (int, int)
-        t/t_dpi_dup_bad.v:12:47: ... Original prototype: int dpii_fa_bit (int)
+                               : ... New signature:      pure int dpii_fa_bit (int, int)
+        t/t_dpi_dup_bad.v:12:47: ... Original signature: int dpii_fa_bit (int)
    12 |    import "DPI-C" dpii_fa_bit =  function int oth_f_int1(input int i);
       |                                               ^~~~~~~~~~
 %Error: Exiting due to

From 9d3e800311b85e879672c43f402adf694e35e4c1 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Sun, 13 Jun 2021 11:18:37 -0400
Subject: [PATCH 12/73] Commentary

---
 docs/internals.rst                    | 6 +++---
 src/V3PreShell.cpp                    | 2 +-
 test_regress/driver.pl                | 6 +++---
 test_regress/t/t_assert_cover.pl      | 2 +-
 test_regress/t/t_cover_sva_notflat.pl | 2 +-
 5 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/docs/internals.rst b/docs/internals.rst
index 71eebfb41..39e3d3862 100644
--- a/docs/internals.rst
+++ b/docs/internals.rst
@@ -502,7 +502,7 @@ Some of the code implementing passes is extremely repetitive, and must be
 implemented for each sub-class of ``AstNode``. However, while repetitive,
 there is more variability than can be handled in C++ macros.
 
-In Verilator this is implemented by using a Perl script, ``astgen`` to
+In Verilator this is implemented by using a script, ``astgen`` to
 pre-process the C++ code. For example in ``V3Const.cpp`` this is used to
 implement the ``visit()`` functions for each binary operation using the
 ``TREEOP`` macro.
@@ -750,8 +750,8 @@ test. For run-time tests, this is followed by a call to the ``execute``
 subroutine. Both of these functions can optionally be provided with a hash
 table as argument specifying additional options.
 
-The test driver assumes by default that the source Verilog file name
-matches the PERL driver name. So a test whose driver is
+The driver.pl script assumes by default that the source Verilog file name
+matches the test script name. So a test whose driver is
 ``t/t_mytest.pl`` will expect a Verilog source file ``t/t_mytest.v``.
 This can be changed using the ``top_filename`` subroutine, for example
 
diff --git a/src/V3PreShell.cpp b/src/V3PreShell.cpp
index 66b7d5f1c..2c8bc4ed8 100644
--- a/src/V3PreShell.cpp
+++ b/src/V3PreShell.cpp
@@ -160,7 +160,7 @@ V3PreProc* V3PreShellImp::s_preprocp = nullptr;
 VInFilter* V3PreShellImp::s_filterp = nullptr;
 
 //######################################################################
-// Perl class functions
+// V3PreShell
 
 void V3PreShell::boot(char** env) { V3PreShellImp::s_preImp.boot(env); }
 bool V3PreShell::preproc(FileLine* fl, const string& modname, VInFilter* filterp,
diff --git a/test_regress/driver.pl b/test_regress/driver.pl
index 54dd82683..37a7d309e 100755
--- a/test_regress/driver.pl
+++ b/test_regress/driver.pl
@@ -2532,9 +2532,9 @@ with many cores.  See the -j option and OBJCACHE environment variable.
 
 =head1 TEST CONFIGURATION
 
-The Perl script (e.g. C<test_regres/t/t_EXAMPLE.pl>) controls how the test
-will run by driver.pl. In general it includes a call to the C<compile>
-subroutine to compile the test with Verilator (or an alternative
+The test configuration script (e.g. C<test_regres/t/t_EXAMPLE.pl>) controls
+how the test will run by driver.pl. In general it includes a call to the
+C<compile> subroutine to compile the test with Verilator (or an alternative
 simulator), followed by a call to the C<execute> subroutine to run the
 test. Compile-only tests omit the call to C<execute>.
 
diff --git a/test_regress/t/t_assert_cover.pl b/test_regress/t/t_assert_cover.pl
index f308ab3df..e72a962af 100755
--- a/test_regress/t/t_assert_cover.pl
+++ b/test_regress/t/t_assert_cover.pl
@@ -41,7 +41,7 @@ file_grep($Self->{run_log_filename}, qr/COVER: Cyc==4/);
 file_grep($Self->{run_log_filename}, qr/COVER: Cyc==5/);
 file_grep($Self->{run_log_filename}, qr/COVER: Cyc==6/);
 
-# Allow old Perl format dump, or new binary dump
+# Allow old SystemC::Coverage format dump, or new binary dump
 file_grep($Self->{coverage_filename}, qr/(cyc_eq_5.*,c=>[^0]|cyc_eq_5.* [1-9][0-9]*\n)/);
 
 ok(1);
diff --git a/test_regress/t/t_cover_sva_notflat.pl b/test_regress/t/t_cover_sva_notflat.pl
index a509d42b8..5effab8e8 100755
--- a/test_regress/t/t_cover_sva_notflat.pl
+++ b/test_regress/t/t_cover_sva_notflat.pl
@@ -20,7 +20,7 @@ execute(
 
 #if ($Self->{nc}) ... # See t_assert_cover.pl for NC version
 
-# Allow old Perl format dump, or new binary dump
+# Allow old SystemC::Coverage format dump, or new binary dump
 # Check that the hierarchy doesn't include __PVT__
 # Otherwise our coverage reports would look really ugly
 if ($Self->{vlt_all}) {

From 31121141db82014d0050c2d2247d12b975cbad0d Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Sun, 13 Jun 2021 12:03:20 -0400
Subject: [PATCH 13/73] Convert pipe filter example to python

---
 Makefile.in                       |  1 +
 bin/verilator_ccache_report       |  3 +-
 test_regress/t/t_pipe_exit_bad.pf |  9 ++--
 test_regress/t/t_pipe_exit_bad.pl |  2 +-
 test_regress/t/t_pipe_filter.pf   | 88 ++++++++++++++++---------------
 test_regress/t/t_pipe_filter.pl   |  2 +-
 6 files changed, 57 insertions(+), 48 deletions(-)
 mode change 100644 => 100755 test_regress/t/t_pipe_exit_bad.pf
 mode change 100644 => 100755 test_regress/t/t_pipe_filter.pf

diff --git a/Makefile.in b/Makefile.in
index fcee49bca..d6b9fd70e 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -492,6 +492,7 @@ PY_PROGRAMS = \
 	src/cppcheck_filtered \
 	src/flexfix \
 	src/vlcovgen \
+	test_regress/t/*.pf \
 	nodist/code_coverage \
 	nodist/dot_importer \
 	nodist/fuzzer/actual_fail \
diff --git a/bin/verilator_ccache_report b/bin/verilator_ccache_report
index 764accd27..dd6d47897 100755
--- a/bin/verilator_ccache_report
+++ b/bin/verilator_ccache_report
@@ -88,6 +88,7 @@ else:
         args.o.write("{:{width}}| {}s\n".format(k,
                                                 v.total_seconds(),
                                                 width=wnames))
-        if i > 4: break
+        if i > 4:
+            break
 
 args.o.write("#" * 80 + "\n")
diff --git a/test_regress/t/t_pipe_exit_bad.pf b/test_regress/t/t_pipe_exit_bad.pf
old mode 100644
new mode 100755
index 9aa87394d..8f3c42b50
--- a/test_regress/t/t_pipe_exit_bad.pf
+++ b/test_regress/t/t_pipe_exit_bad.pf
@@ -1,5 +1,6 @@
-#!/usr/bin/env perl
-use warnings;
+#!/usr/bin/env python3
+# pylint: disable=C0114
+#
 # DESCRIPTION: Verilator: Verilog Test example --pipe-filter script
 #
 # Copyright 2010 by Wilson Snyder. This program is free software; you
@@ -8,4 +9,6 @@ use warnings;
 # Version 2.0.
 # SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
-die "%Error: t_pipe_exit_bad.pf: Intentional bad exit status...\n";
+import sys
+
+sys.exit("%Error: t_pipe_exit_bad.pf: Intentional bad exit status...")
diff --git a/test_regress/t/t_pipe_exit_bad.pl b/test_regress/t/t_pipe_exit_bad.pl
index ed3afdee3..79df707f7 100755
--- a/test_regress/t/t_pipe_exit_bad.pl
+++ b/test_regress/t/t_pipe_exit_bad.pl
@@ -13,7 +13,7 @@ scenarios(vlt => 1);
 top_filename("t/t_pipe_filter.v");
 
 lint(
-    verilator_flags2 => ['-E --pipe-filter \'perl t/t_pipe_exit_bad.pf\' '],
+    verilator_flags2 => ['-E --pipe-filter \'python3 t/t_pipe_exit_bad.pf\' '],
     stdout_filename => $stdout_filename,
     fails => 1,
     expect =>
diff --git a/test_regress/t/t_pipe_filter.pf b/test_regress/t/t_pipe_filter.pf
old mode 100644
new mode 100755
index 4e602fd7c..22af10c97
--- a/test_regress/t/t_pipe_filter.pf
+++ b/test_regress/t/t_pipe_filter.pf
@@ -1,5 +1,6 @@
-#!/usr/bin/env perl
-use warnings;
+#!/usr/bin/env python3
+# pylint: disable=C0103,C0114
+#
 # DESCRIPTION: Verilator: Verilog Test example --pipe-filter script
 #
 # Copyright 2010 by Wilson Snyder. This program is free software; you
@@ -8,51 +9,54 @@ use warnings;
 # Version 2.0.
 # SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
-use IO::File;
-use strict;
+import re
+import sys
 
-our $Debug = 0;
+Debug = False
 
-autoflush STDOUT;
+if Debug:
+    sys.stderr.write("t_pipe_filter.pf: Hello from t_pipe_filter.pf\n")
 
-print STDERR "t_pipe_filter.pf: Hello in Perl\n" if $Debug;
-while (defined(my $cmd = <STDIN>)) {
-    print STDERR "t_pipe_filter.pf: gotcmd: $cmd" if $Debug;
-    if ($cmd =~ /^read "(.*)"/) {
-        my $filename = $1;
-        open(my $fh, "<$filename")
-            or die "t_pipe_filter.pf: %Error: $! $filename\n";
+for cmd in sys.stdin:
+    if Debug:
+        sys.stderr.write("t_pipe_filter.pf: gotcmd: " + cmd)
 
-        my $wholefile="";
-        # It's faster to slurp the whole file then scan (if needed),
-        # then to read it into an array with getlines
-        { local $/; undef $/; $wholefile = <$fh>; }
-        close $fh;
+    match = re.match(r'read "(.*)"', cmd)
+    if match:
+        filename = match.group(1)
 
-        if ($wholefile =~ /example_lint/) {  # else short circuit
-            my $lineno = 1; my $pos=0;
-            my @prefixes;
-            while (1) {
-                my $newpos=index($wholefile,"\n",$pos);
-                last if $newpos<$pos;
-                my $line = substr($wholefile,$pos,$newpos-$pos);
-                if ($line =~ /example_lint/) {
+        wholefile = ""
+        # It's faster to slurp the whole file then scan (if needed)
+        with open(filename) as fh:
+            wholefile = fh.read()
+
+        if 'example_lint' in wholefile:  # else short circuit
+            lineno = 1
+            pos = 0
+            prefixes = []
+            while True:
+                newpos = wholefile.find('\n', pos)
+                if newpos < pos:
+                    break
+                line = wholefile[pos:newpos]
+                if 'example_lint' in line:
                     # We don't have a way to specify this yet, so just for now
-                    #print STDERR $line;
-                    push @prefixes, "int lint_off_line_${lineno} = 1;\n";
-                }
-                $lineno++;
-                $pos = $newpos+1;
-            }
-            #print STDERR "Line count: $lineno\n";
-            $wholefile = join('',@prefixes) . $wholefile;
-        }
+                    # sys.stderr.write($line)
+                    prefixes.append("int lint_off_line_" + str(lineno) +
+                                    " = 1;\n")
 
-        print STDOUT "Content-Length: ".length($wholefile)."\n".$wholefile."\n";
-    } else {
-        die "t_pipe_filter.pf: %Error: Unknown command: $cmd\n";
-    }
-}
+                lineno += 1
+                pos = newpos + 1
 
-print STDOUT "t_pipe_filter.pf: Fin\n" if $Debug;
-exit(0);
+            # sys.stderr.write("Line count: %d\n" % lineno)
+            wholefile = ''.join(prefixes) + wholefile
+
+        print("Content-Length: " + str(len(wholefile)) + "\n" + wholefile)
+        sys.stdout.flush()
+    else:
+        sys.exit("t_pipe_filter.pf: %Error: Unknown command: " + cmd)
+
+if Debug:
+    sys.stderr.write("t_pipe_filter.pf: Fin\n")
+
+sys.exit(0)
diff --git a/test_regress/t/t_pipe_filter.pl b/test_regress/t/t_pipe_filter.pl
index a85cf653e..c303cef67 100755
--- a/test_regress/t/t_pipe_filter.pl
+++ b/test_regress/t/t_pipe_filter.pl
@@ -13,7 +13,7 @@ scenarios(vlt => 1);
 my $stdout_filename = "$Self->{obj_dir}/$Self->{name}__test.vpp";
 
 compile(
-    verilator_flags2 => ['-E --pipe-filter \'perl t/t_pipe_filter.pf\' '],
+    verilator_flags2 => ['-E --pipe-filter \'python3 t/t_pipe_filter.pf\' '],
     verilator_make_gmake => 0,
     make_top_shell => 0,
     make_main => 0,

From 13ddd0bc1cb598746dbfb24d5eb21973e1f3e0fa Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Sun, 13 Jun 2021 12:38:31 -0400
Subject: [PATCH 14/73] Fix error on unsupported recursive functions (#2957).

---
 Changes                        |  2 +-
 src/V3LinkDot.cpp              | 16 +++++++++++-----
 test_regress/t/t_func_bad3.out |  5 +++++
 test_regress/t/t_func_bad3.pl  | 19 +++++++++++++++++++
 test_regress/t/t_func_bad3.v   | 15 +++++++++++++++
 5 files changed, 51 insertions(+), 6 deletions(-)
 create mode 100644 test_regress/t/t_func_bad3.out
 create mode 100755 test_regress/t/t_func_bad3.pl
 create mode 100644 test_regress/t/t_func_bad3.v

diff --git a/Changes b/Changes
index d1b63d9dc..70f794f7e 100644
--- a/Changes
+++ b/Changes
@@ -19,7 +19,7 @@ Verilator 4.205 devel
 **Minor:**
 
 * Merge const static data globally into a new constant pool (#3013). [Geza Lore]
-
+* Fix error on unsupported recursive functions (#2957). [Trefor Southwell]
 
 
 Verilator 4.204 2021-06-12
diff --git a/src/V3LinkDot.cpp b/src/V3LinkDot.cpp
index 102e92034..05469e928 100644
--- a/src/V3LinkDot.cpp
+++ b/src/V3LinkDot.cpp
@@ -2666,11 +2666,17 @@ private:
                 UINFO(7, "   ErrFtask curSymp=se" << cvtToHex(m_curSymp) << " dotSymp=se"
                                                   << cvtToHex(dotSymp) << endl);
                 if (foundp) {
-                    nodep->v3error("Found definition of '"
-                                   << m_ds.m_dotText << (m_ds.m_dotText == "" ? "" : ".")
-                                   << nodep->prettyName() << "'"
-                                   << " as a " << foundp->nodep()->typeName()
-                                   << " but expected a task/function");
+                    if (VN_IS(foundp->nodep(), Var) && m_ds.m_dotText == "" && m_ftaskp
+                        && m_ftaskp->name() == foundp->nodep()->name()) {
+                        nodep->v3warn(E_UNSUPPORTED, "Unsupported: Recursive function call "
+                                                         << nodep->prettyNameQ());
+                    } else {
+                        nodep->v3error("Found definition of '"
+                                       << m_ds.m_dotText << (m_ds.m_dotText == "" ? "" : ".")
+                                       << nodep->prettyName() << "'"
+                                       << " as a " << foundp->nodep()->typeName()
+                                       << " but expected a task/function");
+                    }
                 } else if (VN_IS(nodep, New) && m_statep->forPrearray()) {
                     // Resolved in V3Width
                 } else if (nodep->dotted() == "") {
diff --git a/test_regress/t/t_func_bad3.out b/test_regress/t/t_func_bad3.out
new file mode 100644
index 000000000..628c1a173
--- /dev/null
+++ b/test_regress/t/t_func_bad3.out
@@ -0,0 +1,5 @@
+%Error-UNSUPPORTED: t/t_func_bad3.v:12:27: Unsupported: Recursive function call 'recurse_self'
+   12 |       else recurse_self = recurse_self(i - 1) + 1;
+      |                           ^~~~~~~~~~~~
+                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
+%Error: Exiting due to
diff --git a/test_regress/t/t_func_bad3.pl b/test_regress/t/t_func_bad3.pl
new file mode 100755
index 000000000..877e6133a
--- /dev/null
+++ b/test_regress/t/t_func_bad3.pl
@@ -0,0 +1,19 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+compile(
+    fails => $Self->{vlt_all},
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_func_bad3.v b/test_regress/t/t_func_bad3.v
new file mode 100644
index 000000000..9b8d672f0
--- /dev/null
+++ b/test_regress/t/t_func_bad3.v
@@ -0,0 +1,15 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2003 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t;
+
+   function recurse_self;
+      input i;
+      if (i == 0) recurse_self = 0;
+      else recurse_self = recurse_self(i - 1) + 1;
+   endfunction
+
+endmodule

From 23fc08bdf9f63267ae4e9d3a740bfbe7cc8b2d6e Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sun, 13 Jun 2021 17:00:19 +0100
Subject: [PATCH 15/73] CI: swap order of platforms

GitHub Actions starts the jobs earlier in the list first. This change
has the effect of starting the few longer running jobs (those on ubuntu
20.04) first.
---
 .github/workflows/build.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4105e60da..b59cdb386 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -34,7 +34,7 @@ jobs:
         if [ '${{ github.event_name }}' = 'pull_request' ]; then
           matrix='[ "ubuntu-20.04" ]'
         else
-          matrix='[ "ubuntu-16.04", "ubuntu-18.04", "ubuntu-20.04" ]'
+          matrix='[ "ubuntu-20.04", "ubuntu-18.04", "ubuntu-16.04" ]'
         fi
         echo "::set-output name=matrix::$matrix"
 

From 01a54d69607ea1c8d4cf4a44e74c34a32774b9de Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sun, 13 Jun 2021 17:32:49 +0100
Subject: [PATCH 16/73] CI: Build opt and dbg together, archive whole source
 tree

Prep for adding more CI targets. Building dbg and opt in the same job
(as standard) simplifies caching, debugging and artifact handling. With
ccache it should not take much longer either. Also removes the need to
re-configure in the test job.
---
 .github/workflows/build.yml    | 72 +++++++++++++++-------------------
 .github/workflows/coverage.yml | 40 ++++++++++---------
 Makefile.in                    |  2 +-
 ci/ci-install.bash             |  3 --
 ci/ci-script.bash              |  5 +++
 5 files changed, 58 insertions(+), 64 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b59cdb386..6426f4bd3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -18,6 +18,11 @@ env:
   CCACHE_DIR: ${{ github.workspace }}/.ccache
   CCACHE_LIMIT_MULTIPLE: 0.95
 
+defaults:
+  run:
+    shell: bash
+    working-directory: repo
+
 jobs:
 
 
@@ -27,9 +32,8 @@ jobs:
     outputs:
       matrix: ${{ steps.generate.outputs.matrix }}
     steps:
-    - uses: actions/checkout@v2
     - id: generate
-      name: Run 'generate_matrix.sh'
+      working-directory: ${{ github.workspace }}
       run: |
         if [ '${{ github.event_name }}' = 'pull_request' ]; then
           matrix='[ "ubuntu-20.04" ]'
@@ -45,27 +49,25 @@ jobs:
       fail-fast: false
       matrix:
         os: ${{ fromJson(needs.Matrix.outputs.matrix) }}
-        target:
-          - { name: opt, ccache_size: 48M  }
-          - { name: dbg, ccache_size: 208M }
         compiler:
           - { cc: clang, cxx: clang++ }
           - { cc: gcc,   cxx: g++     }
     runs-on: ${{ matrix.os }}
-    name: Build | ${{ matrix.os }} | ${{ matrix.compiler.cc }} | ${{ matrix.target.name }}
+    name: Build | ${{ matrix.os }} | ${{ matrix.compiler.cc }}
     env:
       CI_BUILD_STAGE_NAME: build
       CI_RUNS_ON: ${{ matrix.os }}
-      CI_MAKE_SRC_TARGET: ${{ matrix.target.name }}
       CC: ${{ matrix.compiler.cc }}
       CXX: ${{ matrix.compiler.cxx }}
-      CACHE_BASE_KEY: build-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.target.name }}
-      CCACHE_MAXSIZE: ${{ matrix.target.ccache_size }} # Per build matrix entry (1G in total)
-      VERILATOR_ARCHIVE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.target.name }}.tar.gz
+      CACHE_BASE_KEY: build-${{ matrix.os }}-${{ matrix.compiler.cc }}
+      CCACHE_MAXSIZE: 250M # Per build matrix entry (1500M in total)
+      VERILATOR_ARCHIVE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}.tar.gz
     steps:
 
     - name: Checkout
       uses: actions/checkout@v2
+      with:
+        path: repo
 
     - name: Cache $CCACHE_DIR
       uses: actions/cache@v2
@@ -81,17 +83,17 @@ jobs:
       run: ./ci/ci-install.bash
 
     - name: Build
-      run: |
-        ccache -z
-        ./ci/ci-script.bash
-        ccache -s
-        tar cvzf ${{ env.VERILATOR_ARCHIVE }} bin
+      run: ./ci/ci-script.bash
 
-    - name: Upload Verilator artifact
+    - name: Tar up repository
+      working-directory: ${{ github.workspace }}
+      run: tar --posix -c -z -f ${{ env.VERILATOR_ARCHIVE }} repo
+
+    - name: Upload tar archive
       uses: actions/upload-artifact@v2
       with:
+        path: ${{ github.workspace }}/${{ env.VERILATOR_ARCHIVE }}
         name: ${{ env.VERILATOR_ARCHIVE }}
-        path: ${{ env.VERILATOR_ARCHIVE }}
 
 
   Test:
@@ -118,11 +120,18 @@ jobs:
       CXX: ${{ matrix.compiler.cxx }}
       CACHE_BASE_KEY: test-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.suite }}
       CCACHE_MAXSIZE: 64M # Per build matrix entry (1920M in total)
-      VERILATOR_ARCHIVE_BASE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}
+      VERILATOR_ARCHIVE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}.tar.gz
     steps:
 
-    - name: Checkout
-      uses: actions/checkout@v2
+    - name: Download tar archive
+      uses: actions/download-artifact@v2
+      with:
+        name: ${{ env.VERILATOR_ARCHIVE }}
+        path: ${{ github.workspace }}
+
+    - name: Unpack tar archive
+      working-directory: ${{ github.workspace }}
+      run: tar -x -z -f ${{ env.VERILATOR_ARCHIVE }}
 
     - name: Cache $CCACHE_DIR
       uses: actions/cache@v2
@@ -134,29 +143,10 @@ jobs:
         restore-keys: |
           ${{ env.CACHE_KEY }}-
 
-    - name: Download Verilator artifact (opt)
-      uses: actions/download-artifact@v2
-      with:
-        name: ${{ env.VERILATOR_ARCHIVE_BASE }}-opt.tar.gz
-
-    - name: Download Verilator artifact (dbg)
-      uses: actions/download-artifact@v2
-      with:
-        name: ${{ env.VERILATOR_ARCHIVE_BASE }}-dbg.tar.gz
-
-    - name: Unpack Verilator artifacts
-      run: |
-        tar xvzf ${{ env.VERILATOR_ARCHIVE_BASE }}-opt.tar.gz
-        tar xvzf ${{ env.VERILATOR_ARCHIVE_BASE }}-dbg.tar.gz
-
     - name: Install test dependencies
-      run: |
-        ./ci/ci-install.bash
+      run: ./ci/ci-install.bash
 
     - name: Test
       env:
         TESTS: ${{ matrix.suite }}
-      run: |
-        ccache -z
-        ./ci/ci-script.bash
-        ccache -s
+      run: ./ci/ci-script.bash
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index fdbe90e85..9fc5e94f2 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -14,6 +14,11 @@ env:
   COVERAGE: 1
   VERILATOR_ARCHIVE: verilator-coverage-${{ github.sha }}.tar.gz
 
+defaults:
+  run:
+    shell: bash
+    working-directory: repo
+
 jobs:
 
 
@@ -26,22 +31,24 @@ jobs:
 
     - name: Checkout
       uses: actions/checkout@v2
+      with:
+        path: repo
 
     - name: Install packages for build
-      env:
-        CI_BUILD_STAGE_NAME: build
       run: ./ci/ci-install.bash
 
     - name: Build
-      run: |
-        ./ci/ci-script.bash
-        tar cvzf ${{ env.VERILATOR_ARCHIVE }} bin src/obj*/*.o src/obj*/*.gcno
+      run: ./ci/ci-script.bash
 
-    - name: Upload Verilator artifact
+    - name: Tar up repository
+      working-directory: ${{ github.workspace }}
+      run: tar --posix -c -z -f ${{ env.VERILATOR_ARCHIVE }} repo
+
+    - name: Upload tar archive
       uses: actions/upload-artifact@v2
       with:
+        path: ${{ github.workspace }}/${{ env.VERILATOR_ARCHIVE }}
         name: ${{ env.VERILATOR_ARCHIVE }}
-        path: ${{ env.VERILATOR_ARCHIVE }}
 
 
   Test:
@@ -72,25 +79,20 @@ jobs:
       CI_RUNS_ON: ubuntu-20.04
     steps:
 
-    - name: Checkout
-      uses: actions/checkout@v2
-
-    - name: Download Verilator artifact
+    - name: Download tar archive
       uses: actions/download-artifact@v2
       with:
         name: ${{ env.VERILATOR_ARCHIVE }}
+        path: ${{ github.workspace }}
 
-    - name: Unapack Verilator artifact
-      run: |
-        tar xvzf ${{ env.VERILATOR_ARCHIVE }}
-        touch src/obj*/*.o src/obj*/*.gcno
+    - name: Unpack tar archive
+      working-directory: ${{ github.workspace }}
+      run: tar -x -z -f ${{ env.VERILATOR_ARCHIVE }}
 
     - name: Install test dependencies
-      run: |
-        ./ci/ci-install.bash
+      run: ./ci/ci-install.bash
 
     - name: Test
       env:
         TESTS: coverage-${{ matrix.test }}${{ matrix.num }}
-      run: |
-        ./ci/ci-script.bash
+      run: ./ci/ci-script.bash
diff --git a/Makefile.in b/Makefile.in
index d6b9fd70e..07e3731ef 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -230,7 +230,7 @@ all_nomsg: verilator_exe $(VL_INST_MAN_FILES)
 verilator_exe verilator_bin$(EXEEXT) verilator_bin_dbg$(EXEEXT) verilator_coverage_bin_dbg$(EXEEXT):
 	@echo ------------------------------------------------------------
 	@echo "making verilator in src"
-	$(MAKE) -C src $(OBJCACHE_JOBS) $(CI_MAKE_SRC_TARGET)
+	$(MAKE) -C src $(OBJCACHE_JOBS)
 
 .PHONY:msg_test
 msg_test: all_nomsg
diff --git a/ci/ci-install.bash b/ci/ci-install.bash
index ff0719f4e..6b4e517ff 100755
--- a/ci/ci-install.bash
+++ b/ci/ci-install.bash
@@ -101,9 +101,6 @@ elif [ "$CI_BUILD_STAGE_NAME" = "test" ]; then
   fi
   yes yes | sudo cpan -M $CI_CPAN_REPO -fi Parallel::Forker
   install-vcddiff
-
-  autoconf
-  ./configure --enable-longtests --enable-ccwarn
 else
   ##############################################################################
   # Unknown build stage
diff --git a/ci/ci-script.bash b/ci/ci-script.bash
index 70ded6d2c..6ff282a78 100755
--- a/ci/ci-script.bash
+++ b/ci/ci-script.bash
@@ -41,7 +41,9 @@ if [ "$CI_BUILD_STAGE_NAME" = "build" ]; then
   if [ "$COVERAGE" != 1 ]; then
     autoconf
     ./configure --enable-longtests --enable-ccwarn
+    ccache -z
     "$MAKE" -j "$NPROC" -k
+    ccache -s
     if [ "$CI_OS_NAME" = "osx" ]; then
       file bin/verilator_bin
       file bin/verilator_bin_dbg
@@ -83,6 +85,7 @@ elif [ "$CI_BUILD_STAGE_NAME" = "test" ]; then
   [ "$CI_RUNS_ON" = 'ubuntu-20.04' ] && sanitize='--sanitize' || sanitize=''
 
   # Run the specified test
+  ccache -z
   case $TESTS in
     dist-vlt-0)
       "$MAKE" -C test_regress SCENARIOS="--dist --vlt $sanitize" DRIVER_HASHSET=--hashset=0/3
@@ -169,6 +172,8 @@ elif [ "$CI_BUILD_STAGE_NAME" = "test" ]; then
       fatal "Unknown test: $TESTS"
       ;;
   esac
+  ccache -s
+
   # Upload coverage data
   if [[ $TESTS == coverage-* ]]; then
     bash <(cat ci/coverage-upload.sh) -f nodist/obj_dir/coverage/app_total.info

From 0c4d88baccd3d253479ac94f444b0f3c621807a2 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sun, 13 Jun 2021 20:04:26 +0100
Subject: [PATCH 17/73] Fix V3Hash when building -m32

---
 src/V3Hash.h | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/src/V3Hash.h b/src/V3Hash.h
index b28b3bf1b..06223567c 100644
--- a/src/V3Hash.h
+++ b/src/V3Hash.h
@@ -26,6 +26,10 @@
 class V3Hash final {
     uint32_t m_value;  // The 32-bit hash value.
 
+    inline static uint32_t combine(uint32_t a, uint32_t b) {
+        return a ^ (b + 0x9e3779b9 + (a << 6) + (a >> 2));
+    }
+
 public:
     // CONSTRUCTORS
     V3Hash()
@@ -34,8 +38,10 @@ public:
         : m_value{val} {}
     explicit V3Hash(int32_t val)
         : m_value{static_cast<uint32_t>(val)} {}
-    explicit V3Hash(size_t val)
-        : m_value{static_cast<uint32_t>(val)} {}
+    explicit V3Hash(uint64_t val)
+        : m_value{combine(static_cast<uint32_t>(val), static_cast<uint32_t>(val >> 32))} {}
+    explicit V3Hash(int64_t val)
+        : m_value{combine(static_cast<uint32_t>(val), static_cast<uint32_t>(val >> 32))} {}
     explicit V3Hash(const std::string& val);
 
     // METHODS
@@ -48,20 +54,12 @@ public:
     bool operator<(const V3Hash& rh) const { return m_value < rh.m_value; }
 
     // '+' combines hashes
-    V3Hash operator+(const V3Hash& that) const {
-        return V3Hash(m_value ^ (that.m_value + 0x9e3779b9 + (m_value << 6) + (m_value >> 2)));
+    template <class T> V3Hash operator+(T that) const {
+        return V3Hash(combine(m_value, V3Hash(that).m_value));
     }
-    V3Hash operator+(uint32_t value) const { return *this + V3Hash(value); }
-    V3Hash operator+(int32_t value) const { return *this + V3Hash(value); }
-    V3Hash operator+(size_t value) const { return *this + V3Hash(value); }
-    V3Hash operator+(const std::string& value) const { return *this + V3Hash(value); }
 
     // '+=' combines in place
-    V3Hash& operator+=(const V3Hash& that) { return *this = *this + that; }
-    V3Hash& operator+=(uint32_t value) { return *this += V3Hash(value); }
-    V3Hash& operator+=(int32_t value) { return *this += V3Hash(value); }
-    V3Hash& operator+=(size_t value) { return *this += V3Hash(value); }
-    V3Hash& operator+=(const std::string& that) { return *this += V3Hash(that); }
+    template <class T> V3Hash& operator+=(T that) { return *this = *this + that; }
 };
 
 std::ostream& operator<<(std::ostream& os, const V3Hash& rhs);

From 6016e74b5553ed674b5e1b191cd86262574b7ba5 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Mon, 14 Jun 2021 00:16:44 +0100
Subject: [PATCH 18/73] Drop ambiguous overloads in VlWide

The 32-bit build fails with the ambiguous overload present.
---
 include/verilated_heavy.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/include/verilated_heavy.h b/include/verilated_heavy.h
index c0b1d9938..97b44c92b 100644
--- a/include/verilated_heavy.h
+++ b/include/verilated_heavy.h
@@ -116,10 +116,8 @@ template <std::size_t T_Words> struct VlWide final {
     // OPERATOR METHODS
     VlWide& operator=(const VlWide&) = default;
     VlWide& operator=(VlWide&&) = default;
-    const EData& operator[](size_t index) const { return m_storage[index]; };
-    EData& operator[](size_t index) { return m_storage[index]; };
-    operator WDataOutP() { return &m_storage[0]; }
-    operator WDataInP() const { return &m_storage[0]; }
+    operator WDataOutP() { return &m_storage[0]; }  // This also allows []
+    operator WDataInP() const { return &m_storage[0]; }  // This also allows []
 
     // METHODS
     const EData& at(size_t index) const { return m_storage[index]; }

From 24b5215cf91a3b1c5a253a622221b70a8be96d15 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sun, 13 Jun 2021 20:13:27 +0100
Subject: [PATCH 19/73] Add --enable-m32 to configure

---
 configure.ac                      | 58 ++++++++++++++++++++++++-------
 test_regress/driver.pl            | 11 +++++-
 test_regress/t/t_flag_ldflags.pl  |  8 +++--
 test_regress/t/t_threads_crazy.pl |  4 +++
 4 files changed, 64 insertions(+), 17 deletions(-)

diff --git a/configure.ac b/configure.ac
index 90bce2208..76844f6cb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -52,7 +52,7 @@ AC_MSG_CHECKING(whether to use tcmalloc)
 AC_ARG_ENABLE([tcmalloc],
               [AS_HELP_STRING([--enable-tcmalloc],
                               [Use libtcmalloc_minimal for faster dynamic memory
-                               management in Verilator binary@<:@default=check@:>@])],
+                               management in Verilator binary @<:@default=check@:>@])],
               [case "${enableval}" in
                 yes) CFG_WITH_TCMALLOC=yes ;;
                 no)  CFG_WITH_TCMALLOC=no ;;
@@ -61,6 +61,20 @@ AC_ARG_ENABLE([tcmalloc],
               [CFG_WITH_TCMALLOC=check;])
 AC_MSG_RESULT($CFG_WITH_TCMALLOC)
 
+# Flag to enable -m32 build
+AC_MSG_CHECKING(whether to use -m32)
+AC_ARG_ENABLE([m32],
+              [AS_HELP_STRING([--enable-m32],
+                              [Use -m32 for all compilation and link,
+                               including Verialtor and generated models.])],
+              [case "${enableval}" in
+                yes) CFG_ENABLE_M32=yes ;;
+                no)  CFG_ENABLE_M32=no ;;
+                *)   AC_MSG_ERROR([bad value '${enableval}' for --enable-m32]) ;;
+               esac],
+               CFG_ENABLE_M32=no)
+AC_MSG_RESULT($CFG_ENABLE_M32)
+
 # Special Substitutions - CFG_WITH_DEFENV
 AC_MSG_CHECKING(whether to use hardcoded paths)
 AC_ARG_ENABLE([defenv],
@@ -211,24 +225,34 @@ AC_DEFUN([_MY_CXX_CHECK_FLAG],
     CXXFLAGS="$ACO_SAVE_CXXFLAGS"
    ])
 
+AC_DEFUN([_MY_CXX_CHECK_IFELSE],
+   [# _MY_CXX_CHECK_IFELSE(option,action-if-supported,action-if-not-supported)
+    # Check if compiler supports specific option. If it does,
+    # do action-if-supported, otherwise do action-if-not-supported
+    _MY_CXX_CHECK_FLAG($1)
+    if test "$_my_result" = "yes" ; then
+      true
+      $2
+    else
+      true
+      $3
+    fi
+   ])
+
 AC_DEFUN([_MY_CXX_CHECK_SET],
-   [# _MY_CXX_CHECK_SET(variable,flag) -- Check if compiler supports specific options
-    # If it does, set variable to flag, only if not previously set
+   [# _MY_CXX_CHECK_SET(variable,option)
+    # Check if compiler supports specific option. If it does,
+    # set variable to option, only if not previously set.
     if test "$$1" = ""; then
-       _MY_CXX_CHECK_FLAG($2)
-       if test "$_my_result" = "yes" ; then
-          $1="$2"
-       fi
+       _MY_CXX_CHECK_IFELSE($2, $1="$2")
     fi
    ])
 
 AC_DEFUN([_MY_CXX_CHECK_OPT],
-   [# _MY_CXX_CHECK_OPT(flag) -- Check if compiler supports specific options
-    # If it does, append flag to variable
-    _MY_CXX_CHECK_FLAG($2)
-    if test "$_my_result" = "yes" ; then
-       $1="$$1 $2"
-    fi
+   [# _MY_CXX_CHECK_OPT(variable,option)
+    # Check if compiler supports specific option. If it does,
+    # append option to variable
+    _MY_CXX_CHECK_IFELSE($2, $1="$$1 $2")
    ])
 
 AC_DEFUN([_MY_LDLIBS_CHECK_FLAG],
@@ -270,6 +294,14 @@ AC_DEFUN([_MY_LDLIBS_CHECK_OPT],
     _MY_LDLIBS_CHECK_IFELSE($2, $1="$$1 $2")
    ])
 
+# When using -m32. Check this first as later checks may fail with the -m32 flag.
+if test "$CFG_ENABLE_M32" = "yes"; then
+  _MY_CXX_CHECK_IFELSE(
+    -m32,
+    [CXX="$CXX -m32"],
+    [AC_MSG_ERROR([--enable-m32 was given but compiler does not support -m32])])
+fi
+
 # Flag to select newest language standard supported
 # Macros work such that first option that passes is the one we take
 # Currently enabled gnu++14/c++14 due to packaged SystemC dependency
diff --git a/test_regress/driver.pl b/test_regress/driver.pl
index 37a7d309e..679906687 100755
--- a/test_regress/driver.pl
+++ b/test_regress/driver.pl
@@ -601,6 +601,7 @@ sub new {
                         ? " -Wl,-undefined,dynamic_lookup"
                         : " -export-dynamic")
                       .($opt_verbose ? " -DTEST_VERBOSE=1":"")
+                      .(cfg_with_m32() ? " -m32" : "")
                       ." -o $self->{obj_dir}/libvpi.so"],
         tool_c_flags => [],
         # ATSIM
@@ -2304,8 +2305,16 @@ sub cfg_with_threaded {
     return 1;  # C++11 now always required
 }
 
+our $_Cfg_with_ccache;
 sub cfg_with_ccache {
-    return `grep "OBJCACHE \?= ccache" "$ENV{VERILATOR_ROOT}/include/verilated.mk"` ne "";
+    $_Cfg_with_ccache ||= `grep "OBJCACHE \?= ccache" "$ENV{VERILATOR_ROOT}/include/verilated.mk"` ne "";
+    return $_Cfg_with_ccache;
+}
+
+our $_Cfg_with_m32;
+sub cfg_with_m32 {
+    $_Cfg_with_m32 ||= `grep "CXX.*=.*-m32" "$ENV{VERILATOR_ROOT}/include/verilated.mk"` ne "";
+    return $_Cfg_with_m32;
 }
 
 sub tries {
diff --git a/test_regress/t/t_flag_ldflags.pl b/test_regress/t/t_flag_ldflags.pl
index db80da480..1701a0b90 100755
--- a/test_regress/t/t_flag_ldflags.pl
+++ b/test_regress/t/t_flag_ldflags.pl
@@ -10,14 +10,16 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 
 scenarios(vlt => 1);
 
+my $m32 = $Self->cfg_with_m32 ? "-m32" : "";
+
 run(cmd => ["cd $Self->{obj_dir}"
-            ." && $ENV{CXX} -c ../../t/t_flag_ldflags_a.cpp"
+            ." && $ENV{CXX} $m32 -c ../../t/t_flag_ldflags_a.cpp"
             ." && ar -cr t_flag_ldflags_a.a t_flag_ldflags_a.o"
             ." && ranlib t_flag_ldflags_a.a "],
     check_finished => 0);
 run(cmd => ["cd $Self->{obj_dir}"
-            ." && $ENV{CXX} -fPIC -c ../../t/t_flag_ldflags_so.cpp"
-            ." && $ENV{CXX} -shared -o t_flag_ldflags_so.so -lc t_flag_ldflags_so.o"],
+            ." && $ENV{CXX} $m32 -fPIC -c ../../t/t_flag_ldflags_so.cpp"
+            ." && $ENV{CXX} $m32 -shared -o t_flag_ldflags_so.so -lc t_flag_ldflags_so.o"],
     check_finished => 0);
 
 compile(
diff --git a/test_regress/t/t_threads_crazy.pl b/test_regress/t/t_threads_crazy.pl
index 1d54c9e0a..54641105d 100755
--- a/test_regress/t/t_threads_crazy.pl
+++ b/test_regress/t/t_threads_crazy.pl
@@ -10,6 +10,10 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 
 scenarios(vltmt => 1);
 
+if ($Self->cfg_with_m32) {
+  skip("Does not work with -m32 (resource unavailable)");
+}
+
 compile(
     verilator_flags2 => ['--cc --threads 1024'],
     );

From 208f1504fbee321c059ad2b55271ab4f0757021a Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sun, 13 Jun 2021 20:38:24 +0100
Subject: [PATCH 20/73] CI: Add -m32 build

---
 .github/workflows/build.yml  | 72 +++++++++++++++++-------------------
 .github/workflows/format.yml |  1 +
 ci/ci-install.bash           | 10 ++++-
 ci/ci-script.bash            | 10 ++++-
 4 files changed, 51 insertions(+), 42 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6426f4bd3..2575fb44f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -25,43 +25,34 @@ defaults:
 
 jobs:
 
-
-  Matrix:
-    runs-on: ubuntu-latest
-    name: Generate Build matrix
-    outputs:
-      matrix: ${{ steps.generate.outputs.matrix }}
-    steps:
-    - id: generate
-      working-directory: ${{ github.workspace }}
-      run: |
-        if [ '${{ github.event_name }}' = 'pull_request' ]; then
-          matrix='[ "ubuntu-20.04" ]'
-        else
-          matrix='[ "ubuntu-20.04", "ubuntu-18.04", "ubuntu-16.04" ]'
-        fi
-        echo "::set-output name=matrix::$matrix"
-
-
-  Build:
-    needs: Matrix
+  build:
     strategy:
       fail-fast: false
       matrix:
-        os: ${{ fromJson(needs.Matrix.outputs.matrix) }}
+        os: [ubuntu-20.04, ubuntu-18.04, ubuntu-16.04]
         compiler:
           - { cc: clang, cxx: clang++ }
           - { cc: gcc,   cxx: g++     }
+        m32: [0, 1]
+        exclude:
+          # Build pull requests only with ubuntu-20.04 and without m32
+          - os:  ${{ github.event_name == 'pull_request' && 'ubuntu-18.04' || 'do-not-exclude' }}
+          - os:  ${{ github.event_name == 'pull_request' && 'ubuntu-16.04' || 'do-not-exclude' }}
+          - m32: ${{ github.event_name == 'pull_request' && 1              || 'do-not-exclude' }}
+          # Build -m32 only on ubuntu-20.04
+          - {os: ubuntu-18.04, m32: 1}
+          - {os: ubuntu-16.04, m32: 1}
     runs-on: ${{ matrix.os }}
-    name: Build | ${{ matrix.os }} | ${{ matrix.compiler.cc }}
+    name: Build | ${{ matrix.os }} | ${{ matrix.compiler.cc }} ${{ matrix.m32 && '| -m32' || '' }}
     env:
       CI_BUILD_STAGE_NAME: build
       CI_RUNS_ON: ${{ matrix.os }}
+      CI_M32: ${{ matrix.m32 }}
       CC: ${{ matrix.compiler.cc }}
       CXX: ${{ matrix.compiler.cxx }}
-      CACHE_BASE_KEY: build-${{ matrix.os }}-${{ matrix.compiler.cc }}
-      CCACHE_MAXSIZE: 250M # Per build matrix entry (1500M in total)
-      VERILATOR_ARCHIVE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}.tar.gz
+      CACHE_BASE_KEY: build-${{ matrix.os }}-${{ matrix.compiler.cc }}-m32=${{ matrix.m32 }}
+      CCACHE_MAXSIZE: 250M # Per build matrix entry (2000M in total)
+      VERILATOR_ARCHIVE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}${{ matrix.m32 && '-m32' || '' }}.tar.gz
     steps:
 
     - name: Checkout
@@ -96,31 +87,36 @@ jobs:
         name: ${{ env.VERILATOR_ARCHIVE }}
 
 
-  Test:
-    needs: [ Matrix, Build ]
+  test:
+    needs: build
     strategy:
       fail-fast: false
       matrix:
-        os: ${{ fromJson(needs.Matrix.outputs.matrix) }}
+        os: [ubuntu-20.04, ubuntu-18.04, ubuntu-16.04]
         compiler:
           - { cc: clang, cxx: clang++ }
           - { cc: gcc,   cxx: g++     }
-        suite:
-          - dist-vlt-0
-          - dist-vlt-1
-          - dist-vlt-2
-          - vltmt-0
-          - vltmt-1
+        m32: [0, 1]
+        suite: [dist-vlt-0, dist-vlt-1, dist-vlt-2, vltmt-0, vltmt-1]
+        exclude:
+          # Build pull requests only with ubuntu-20.04 and without m32
+          - os:  ${{ github.event_name == 'pull_request' && 'ubuntu-18.04' || 'do-not-exclude' }}
+          - os:  ${{ github.event_name == 'pull_request' && 'ubuntu-16.04' || 'do-not-exclude' }}
+          - m32: ${{ github.event_name == 'pull_request' && 1              || 'do-not-exclude' }}
+          # Build -m32 only on ubuntu-20.04
+          - {os: ubuntu-18.04, m32: 1}
+          - {os: ubuntu-16.04, m32: 1}
     runs-on: ${{ matrix.os }}
-    name: Test | ${{ matrix.os }} | ${{ matrix.compiler.cc }} | ${{ matrix.suite }}
+    name: Test | ${{ matrix.os }} | ${{ matrix.compiler.cc }} | ${{ matrix.suite }} ${{ matrix.m32 && '| -m32' || '' }}
     env:
       CI_BUILD_STAGE_NAME: test
       CI_RUNS_ON: ${{ matrix.os }}
+      CI_M32: ${{ matrix.m32 }}
       CC: ${{ matrix.compiler.cc }}
       CXX: ${{ matrix.compiler.cxx }}
-      CACHE_BASE_KEY: test-${{ matrix.os }}-${{ matrix.compiler.cc }}-${{ matrix.suite }}
-      CCACHE_MAXSIZE: 64M # Per build matrix entry (1920M in total)
-      VERILATOR_ARCHIVE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}.tar.gz
+      CACHE_BASE_KEY: test-${{ matrix.os }}-${{ matrix.compiler.cc }}-m32=${{ matrix.m32 }}-${ matrix.suite }}
+      CCACHE_MAXSIZE: 64M # Per build matrix entry (2160M in total)
+      VERILATOR_ARCHIVE: verilator-${{ github.sha }}-${{ matrix.os }}-${{ matrix.compiler.cc }}${{ matrix.m32 && '-m32' || '' }}.tar.gz
     steps:
 
     - name: Download tar archive
diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index 6d6d68887..7e670e2ce 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -16,6 +16,7 @@ jobs:
       CI_OS_NAME: linux
       CI_RUNS_ON: ubuntu-20.04
       CI_COMMIT: ${{ github.sha }}
+      CI_M32: 0
     steps:
       - name: Checkout
         uses: actions/checkout@v2
diff --git a/ci/ci-install.bash b/ci/ci-install.bash
index 6b4e517ff..c13328d0e 100755
--- a/ci/ci-install.bash
+++ b/ci/ci-install.bash
@@ -23,6 +23,12 @@ fatal() {
   echo "ERROR: $(basename "$0"): $1" >&2; exit 1;
 }
 
+if [ "$CI_M32" = "0" ]; then
+  unset CI_M32
+elif [ "$CI_M32" != "1" ]; then
+  fatal "\$CI_M32 must be '0' or '1'";
+fi
+
 if [ "$CI_OS_NAME" = "linux" ]; then
   MAKE=make
 elif [ "$CI_OS_NAME" = "osx" ]; then
@@ -55,7 +61,7 @@ if [ "$CI_BUILD_STAGE_NAME" = "build" ]; then
     if [ "$COVERAGE" = 1 ]; then
       yes yes | sudo cpan -fi Parallel::Forker
     fi
-    if [ "$M32" = 1 ]; then
+    if [ "$CI_M32" = 1 ]; then
       sudo apt-get install gcc-multilib g++-multilib
     fi
   elif [ "$CI_OS_NAME" = "osx" ]; then
@@ -82,7 +88,7 @@ elif [ "$CI_BUILD_STAGE_NAME" = "test" ]; then
     if [ "$CI_RUNS_ON" = "ubuntu-20.04" ]; then
       sudo apt-get install libsystemc-dev
     fi
-    if [ "$M32" = 1 ]; then
+    if [ "$CI_M32" = 1 ]; then
       sudo apt-get install lib32z1-dev gcc-multilib g++-multilib
     fi
   elif [ "$CI_OS_NAME" = "osx" ]; then
diff --git a/ci/ci-script.bash b/ci/ci-script.bash
index 6ff282a78..6ffcda655 100755
--- a/ci/ci-script.bash
+++ b/ci/ci-script.bash
@@ -21,6 +21,12 @@ fatal() {
   echo "ERROR: $(basename "$0"): $1" >&2; exit 1;
 }
 
+if [ "$CI_M32" = "0" ]; then
+  unset CI_M32
+elif [ "$CI_M32" != "1" ]; then
+  fatal "\$CI_M32 must be '0' or '1'";
+fi
+
 if [ "$CI_OS_NAME" = "linux" ]; then
   export MAKE=make
   NPROC=$(nproc)
@@ -40,7 +46,7 @@ if [ "$CI_BUILD_STAGE_NAME" = "build" ]; then
 
   if [ "$COVERAGE" != 1 ]; then
     autoconf
-    ./configure --enable-longtests --enable-ccwarn
+    ./configure --enable-longtests --enable-ccwarn ${CI_M32:+--enable-m32}
     ccache -z
     "$MAKE" -j "$NPROC" -k
     ccache -s
@@ -82,7 +88,7 @@ elif [ "$CI_BUILD_STAGE_NAME" = "test" ]; then
   fi
 
   # Run sanitize on Ubuntu 20.04 only
-  [ "$CI_RUNS_ON" = 'ubuntu-20.04' ] && sanitize='--sanitize' || sanitize=''
+  [ "$CI_RUNS_ON" = 'ubuntu-20.04' ] && [ "$CI_M32" = "" ] && sanitize='--sanitize' || sanitize=''
 
   # Run the specified test
   ccache -z

From 2705715bb1281c921e01f220305997d05d1ab976 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Mon, 14 Jun 2021 01:30:50 +0100
Subject: [PATCH 21/73] CI: set CI_M32 to 0 in coverage workflow

---
 .github/workflows/coverage.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 9fc5e94f2..506dd98a1 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -11,6 +11,7 @@ on:
 env:
   CI_OS_NAME: linux
   CI_COMMIT: ${{ github.sha }}
+  CI_M32: 0
   COVERAGE: 1
   VERILATOR_ARCHIVE: verilator-coverage-${{ github.sha }}.tar.gz
 

From c75a686081a7fb979cc577fee2a808f9ae0870eb Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Mon, 14 Jun 2021 19:50:40 +0100
Subject: [PATCH 22/73] Internals: Update to clang-format-11 (#3021)

---
 .github/workflows/format.yml    |  4 ++--
 Makefile.in                     |  6 +++---
 docs/guide/install.rst          |  2 +-
 include/verilated_sym_props.h   | 32 ++++++++++++++++++--------------
 src/V3AstNodes.h                |  6 +++---
 src/V3EmitCConstPool.cpp        | 12 +++++-------
 src/V3GraphDfa.h                |  8 ++++----
 src/V3Name.cpp                  | 12 +++++-------
 src/V3Task.cpp                  |  5 +++--
 src/V3Tristate.cpp              | 12 +++++++++---
 src/V3Undriven.cpp              |  5 +++--
 test_regress/t/t_tri_select.cpp |  9 ++++-----
 12 files changed, 60 insertions(+), 53 deletions(-)

diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index 7e670e2ce..1b6662ea0 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -27,14 +27,14 @@ jobs:
           CI_BUILD_STAGE_NAME: build
         run: |
           bash ci/ci-install.bash &&
-          sudo apt-get install clang-10 yapf3 &&
+          sudo apt-get install clang-format-11 yapf3 &&
           git config --global user.email "action@example.com" &&
           git config --global user.name "github action"
       - name: Format code
         run: |
           autoconf &&
           ./configure &&
-          make -j 2 format CLANGFORMAT=clang-format-10 &&
+          make -j 2 format CLANGFORMAT=clang-format-11 &&
           git status
       - name: Push
         run: |
diff --git a/Makefile.in b/Makefile.in
index 07e3731ef..38c73b19d 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -470,13 +470,13 @@ analyzer-include:
 
 format: clang-format yapf format-pl-exec
 
-CLANGFORMAT = clang-format
+CLANGFORMAT = clang-format-11
 CLANGFORMAT_FLAGS = -i
 CLANGFORMAT_FILES = $(CPPCHECK_CPP) $(CPPCHECK_H) $(CPPCHECK_YL) test_regress/t/*.c* test_regress/t/*.h
 
 clang-format:
-	@$(CLANGFORMAT) --version | egrep 10.0 > /dev/null \
-		|| echo "*** You are not using clang-format 10.0, indents may differ from master's ***"
+	@$(CLANGFORMAT) --version | egrep 11.0 > /dev/null \
+		|| echo "*** You are not using clang-format 11.0, indents may differ from master's ***"
 	$(CLANGFORMAT) $(CLANGFORMAT_FLAGS) $(CLANGFORMAT_FILES)
 
 PY_PROGRAMS = \
diff --git a/docs/guide/install.rst b/docs/guide/install.rst
index 7154315ce..5f2c50b12 100644
--- a/docs/guide/install.rst
+++ b/docs/guide/install.rst
@@ -116,7 +116,7 @@ Those developing Verilator itself may also want these (see internals.rst):
 
 ::
 
-   sudo apt-get install gdb graphviz cmake clang clang-format gprof lcov
+   sudo apt-get install gdb graphviz cmake clang clang-format-11 gprof lcov
    sudo pip3 install sphinx sphinx_rtd_theme breathe
    cpan install Pod::Perldoc
    cpan install Parallel::Forker
diff --git a/include/verilated_sym_props.h b/include/verilated_sym_props.h
index 4294aa0c6..2373760e0 100644
--- a/include/verilated_sym_props.h
+++ b/include/verilated_sym_props.h
@@ -152,30 +152,34 @@ public:
     const VerilatedRange& unpacked() const { return m_unpacked[0]; }
     // DPI accessors
     int left(int dim) const {
-        return dim == 0 ? m_packed.left()
-                        : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].left() : 0;
+        return dim == 0                                ? m_packed.left()
+               : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].left()
+                                                       : 0;
     }
     int right(int dim) const {
-        return dim == 0 ? m_packed.right()
-                        : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].right() : 0;
+        return dim == 0                                ? m_packed.right()
+               : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].right()
+                                                       : 0;
     }
     int low(int dim) const {
-        return dim == 0 ? m_packed.low()
-                        : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].low() : 0;
+        return dim == 0                                ? m_packed.low()
+               : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].low()
+                                                       : 0;
     }
     int high(int dim) const {
-        return dim == 0 ? m_packed.high()
-                        : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].high() : 0;
+        return dim == 0                                ? m_packed.high()
+               : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].high()
+                                                       : 0;
     }
     int increment(int dim) const {
-        return dim == 0
-                   ? m_packed.increment()
-                   : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].increment() : 0;
+        return dim == 0                                ? m_packed.increment()
+               : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].increment()
+                                                       : 0;
     }
     int elements(int dim) const {
-        return dim == 0
-                   ? m_packed.elements()
-                   : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].elements() : 0;
+        return dim == 0                                ? m_packed.elements()
+               : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].elements()
+                                                       : 0;
     }
     // Total size in bytes (note DPI limited to 4GB)
     size_t totalSize() const;
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index 67b424aae..6416bb965 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -5428,9 +5428,9 @@ public:
                        : (m_urandom ? "%f$urandom()" : "%f$random()");
     }
     virtual string emitC() override {
-        return m_reset
-                   ? "VL_RAND_RESET_%nq(%nw, %P)"
-                   : seedp() ? "VL_RANDOM_SEEDED_%nq%lq(%nw, %P, %li)" : "VL_RANDOM_%nq(%nw, %P)";
+        return m_reset   ? "VL_RAND_RESET_%nq(%nw, %P)"
+               : seedp() ? "VL_RANDOM_SEEDED_%nq%lq(%nw, %P, %li)"
+                         : "VL_RANDOM_%nq(%nw, %P)";
     }
     virtual bool cleanOut() const override { return true; }
     virtual bool isGateOptimizable() const override { return false; }
diff --git a/src/V3EmitCConstPool.cpp b/src/V3EmitCConstPool.cpp
index 7e48520d9..589914a6e 100644
--- a/src/V3EmitCConstPool.cpp
+++ b/src/V3EmitCConstPool.cpp
@@ -110,13 +110,11 @@ class EmitCConstPool final : EmitCBaseVisitor {
         UASSERT_OBJ(dtypep, nodep, "Array initializer has non-array dtype");
         const uint32_t size = dtypep->elementsConst();
         const uint32_t elemBytes = dtypep->subDTypep()->widthTotalBytes();
-        const uint32_t tabMod = dtypep->subDTypep()->isString()
-                                    ? 1  // String
-                                    : elemBytes <= 2
-                                          ? 8  // CData, SData
-                                          : elemBytes <= 4 ? 4  // IData
-                                                           : elemBytes <= 8 ? 2  // QData
-                                                                            : 1;
+        const uint32_t tabMod = dtypep->subDTypep()->isString() ? 1  // String
+                                : elemBytes <= 2                ? 8  // CData, SData
+                                : elemBytes <= 4                ? 4  // IData
+                                : elemBytes <= 8                ? 2  // QData
+                                                                : 1;
         VL_RESTORER(m_inUnpacked);
         VL_RESTORER(m_unpackedWord);
         m_inUnpacked = true;
diff --git a/src/V3GraphDfa.h b/src/V3GraphDfa.h
index 854a4074f..79e6e465e 100644
--- a/src/V3GraphDfa.h
+++ b/src/V3GraphDfa.h
@@ -134,10 +134,10 @@ public:
         return (na() ? "yellow" : epsilon() ? "green" : "black");
     }
     virtual string dotLabel() const override {
-        return (na() ? ""
-                     : epsilon() ? "e"
-                                 : complement() ? ("not " + cvtToStr(input().toInt()))
-                                                : cvtToStr(input().toInt()));
+        return (na()           ? ""
+                : epsilon()    ? "e"
+                : complement() ? ("not " + cvtToStr(input().toInt()))
+                               : cvtToStr(input().toInt()));
     }
     virtual string dotStyle() const override { return (na() || cutable()) ? "dashed" : ""; }
     bool epsilon() const { return input().toInt() == EPSILON().toInt(); }
diff --git a/src/V3Name.cpp b/src/V3Name.cpp
index 2c7ad9e96..7a57f42f8 100644
--- a/src/V3Name.cpp
+++ b/src/V3Name.cpp
@@ -118,13 +118,11 @@ private:
             if (nodep->aboveCellp()) iterate(nodep->aboveCellp());
             // Always recompute name (as many levels above scope may have changed)
             // Same formula as V3Scope
-            nodep->name(nodep->isTop()
-                            ? "TOP"
-                            : VN_IS(m_modp, Class) ? ("TOP." + m_modp->name())
-                                                   : VN_IS(m_modp, ClassPackage)
-                                                         ? ("TOP." + m_modp->name())
-                                                         : (nodep->aboveScopep()->name() + "."
-                                                            + nodep->aboveCellp()->name()));
+            nodep->name(nodep->isTop()         ? "TOP"
+                        : VN_IS(m_modp, Class) ? ("TOP." + m_modp->name())
+                        : VN_IS(m_modp, ClassPackage)
+                            ? ("TOP." + m_modp->name())
+                            : (nodep->aboveScopep()->name() + "." + nodep->aboveCellp()->name()));
             nodep->editCountInc();
             iterateChildren(nodep);
         }
diff --git a/src/V3Task.cpp b/src/V3Task.cpp
index 963a1bc7a..edcfe6a1c 100644
--- a/src/V3Task.cpp
+++ b/src/V3Task.cpp
@@ -889,8 +889,9 @@ private:
                            << AstNode::prettyNameQ(nodep->cname()));
         }
         // Tasks (but not void functions) return a boolean 'int' indicating disabled
-        const string rtnType
-            = rtnvarp ? rtnvarp->dpiArgType(true, true) : nodep->dpiTask() ? "int" : "";
+        const string rtnType = rtnvarp            ? rtnvarp->dpiArgType(true, true)
+                               : nodep->dpiTask() ? "int"
+                                                  : "";
         AstCFunc* const funcp = new AstCFunc(nodep->fileline(), nodep->cname(), m_scopep, rtnType);
         funcp->dpiImportPrototype(true);
         funcp->dontCombine(true);
diff --git a/src/V3Tristate.cpp b/src/V3Tristate.cpp
index a4b7515d7..1c64911f8 100644
--- a/src/V3Tristate.cpp
+++ b/src/V3Tristate.cpp
@@ -92,12 +92,18 @@ public:
     AstNode* nodep() const { return m_nodep; }
     AstVar* varp() const { return VN_CAST(nodep(), Var); }
     virtual string name() const override {
-        return ((isTristate() ? "tri\\n" : feedsTri() ? "feed\\n" : "-\\n")
+        return ((isTristate() ? "tri\\n"
+                 : feedsTri() ? "feed\\n"
+                              : "-\\n")
                 + (nodep()->prettyTypeName() + " " + cvtToHex(nodep())));
     }
     virtual string dotColor() const override {
-        return (varp() ? (isTristate() ? "darkblue" : feedsTri() ? "blue" : "lightblue")
-                       : (isTristate() ? "darkgreen" : feedsTri() ? "green" : "lightgreen"));
+        return (varp() ? (isTristate() ? "darkblue"
+                          : feedsTri() ? "blue"
+                                       : "lightblue")
+                       : (isTristate() ? "darkgreen"
+                          : feedsTri() ? "green"
+                                       : "lightgreen"));
     }
     virtual FileLine* fileline() const override { return nodep()->fileline(); }
     void isTristate(bool flag) { m_isTristate = flag; }
diff --git a/src/V3Undriven.cpp b/src/V3Undriven.cpp
index 158ffd2f1..e9185aac8 100644
--- a/src/V3Undriven.cpp
+++ b/src/V3Undriven.cpp
@@ -172,8 +172,9 @@ public:
                 allD = allU = true;
             if (allU) m_wholeFlags[FLAG_USED] = true;
             if (allD) m_wholeFlags[FLAG_DRIVEN] = true;
-            const char* const what
-                = nodep->isParam() ? "parameter" : nodep->isGenVar() ? "genvar" : "signal";
+            const char* const what = nodep->isParam()    ? "parameter"
+                                     : nodep->isGenVar() ? "genvar"
+                                                         : "signal";
             // Test results
             if (nodep->isIfaceRef()) {
                 // For interface top level we don't do any tracking
diff --git a/test_regress/t/t_tri_select.cpp b/test_regress/t/t_tri_select.cpp
index c33f2c7cf..0db6f19ef 100644
--- a/test_regress/t/t_tri_select.cpp
+++ b/test_regress/t/t_tri_select.cpp
@@ -17,11 +17,10 @@ bool check() {
     bool verbose = false;
 #endif
 
-    int Y = ((tb->OE1) & (!tb->OE2))
-                ? tb->A1
-                : ((!tb->OE1) & (tb->OE2))
-                      ? tb->A2
-                      : ((tb->OE1) & (tb->OE2)) ? (tb->A1 | tb->A2) : 3;  // pullup
+    int Y = ((tb->OE1) & (!tb->OE2))   ? tb->A1
+            : ((!tb->OE1) & (tb->OE2)) ? tb->A2
+            : ((tb->OE1) & (tb->OE2))  ? (tb->A1 | tb->A2)
+                                       : 3;  // pullup
 
     int W = (((tb->OE2) ? (tb->A2 & 0x1) : 0) << tb->A1)
             | (((tb->OE1) ? (tb->A2 >> 1) & 0x1 : 0) << tb->A2);

From 65bfb4e5ff8629cdaa07bc036031671250d42006 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Mon, 14 Jun 2021 18:03:05 +0100
Subject: [PATCH 23/73] Build Verilator without -Og in the coverage build

The coverage numbers decreased when adding -Og to the debug build. This
patch restores them by adding --enable-coverage to configure and
building without -Og if requested.
---
 configure.ac         | 35 +++++++++++++++++++++++++++++++++++
 nodist/code_coverage | 18 +-----------------
 2 files changed, 36 insertions(+), 17 deletions(-)

diff --git a/configure.ac b/configure.ac
index 76844f6cb..c111cecc1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -75,6 +75,20 @@ AC_ARG_ENABLE([m32],
                CFG_ENABLE_M32=no)
 AC_MSG_RESULT($CFG_ENABLE_M32)
 
+# Flag to enable coverage build
+AC_MSG_CHECKING(whether to build for coverage collection)
+AC_ARG_ENABLE([coverage],
+              [AS_HELP_STRING([--enable-coverage],
+                              [Build Verilator for code coverage collection.
+                               For developers only.])],
+              [case "${enableval}" in
+                yes) CFG_ENABLE_COVERAGE=yes ;;
+                no)  CFG_ENABLE_COVERAGE=no ;;
+                *)   AC_MSG_ERROR([bad value '${enableval}' for --enable-coverage]) ;;
+               esac],
+               CFG_ENABLE_COVERAGE=no)
+AC_MSG_RESULT($CFG_ENABLE_COVERAGE)
+
 # Special Substitutions - CFG_WITH_DEFENV
 AC_MSG_CHECKING(whether to use hardcoded paths)
 AC_ARG_ENABLE([defenv],
@@ -302,6 +316,25 @@ if test "$CFG_ENABLE_M32" = "yes"; then
     [AC_MSG_ERROR([--enable-m32 was given but compiler does not support -m32])])
 fi
 
+# Similarly, add the coverage flags early as they influence later checks.
+if test "$CFG_ENABLE_COVERAGE" = "yes"; then
+  _MY_CXX_CHECK_OPT(CXX,--coverage)
+  # Otherwise inline may not show as uncovered
+  #  If we use this then e.g. verilated.h functions properly show up
+  #  if unused.
+  #  However, VerilatedSerialize::write then changes from covered
+  #  to uncovered (in G++ 9.3.0) even with all inlining turned off.
+  #  Having false negative coverage is more effort then missing negatives.
+  #  Also this seems to explode the runtime (since a lot more data).
+  #  _MY_CXX_CHECK_OPT(CXX,-fkeep-inline-functions)
+  # Otherwise static may not show as uncovered
+  _MY_CXX_CHECK_OPT(CXX,-fkeep-static-functions)
+  # Exceptions can pollute the branch coverage data
+  _MY_CXX_CHECK_OPT(CXX,-fno-exceptions)
+  # Define-out some impossible stuff
+  _MY_CXX_CHECK_OPT(CXX,-DVL_GCOV)
+fi
+
 # Flag to select newest language standard supported
 # Macros work such that first option that passes is the one we take
 # Currently enabled gnu++14/c++14 due to packaged SystemC dependency
@@ -355,7 +388,9 @@ _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_PARSER,-Wno-unused)
 AC_SUBST(CFG_CXXFLAGS_PARSER)
 
 # Flags for compiling the debug version of Verilator (in addition to above CFG_CXXFLAGS_SRC)
+if test "$CFG_ENABLE_COVERAGE" = "no"; then # Do not optimize for the coverage build
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DEBUG,-Og)
+fi
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DEBUG,-ggdb)
 _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DEBUG,-gz)
 AC_SUBST(CFG_CXXFLAGS_DEBUG)
diff --git a/nodist/code_coverage b/nodist/code_coverage
index 0a3cc0e08..ffddfa585 100755
--- a/nodist/code_coverage
+++ b/nodist/code_coverage
@@ -38,23 +38,7 @@ def test():
         ci_fold_start("configure")
         print("Stage 1: configure (coverage on)")
         run("autoconf")
-        cxx_flags = (
-            "--coverage"
-            # Otherwise inline may not show as uncovered
-            #  If we use this then e.g. verilated.h functions properly show up
-            #  if unused.
-            #  However, VerilatedSerialize::write then changes from covered
-            #  to uncovered (in G++ 9.3.0) even with all inlining turned off.
-            #  Having false negative coverage is more effort then missing negatives.
-            #  Also this seems to explode the runtime (since a lot more data).
-            #  + " -fkeep-inline-functions"
-            # Otherwise static may not show as uncovered
-            + " -fkeep-static-functions"
-            # Exceptions can pollute the branch coverage data
-            + " -fno-exceptions"
-            # Define-out some impossible stuff
-            + " -DVL_GCOV")
-        run("./configure --enable-longtests CXX='g++ " + cxx_flags + "'")
+        run("./configure --enable-longtests --enable-coverage CXX=g++")
         ci_fold_end()
 
     if Args.stage_enabled[2]:

From a8f83d575811a4774c65aa2f76335035af84779d Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Wed, 16 Jun 2021 12:18:56 +0100
Subject: [PATCH 24/73] Construct AstExecGraph implementation outside of
 V3EmitC. (#3022)

The goal of this patch is to move functionality related to constructing
the thread entry points and then invoking them out of V3EmitC (and into
V3Partition). The long term goal being enabling V3EmitC to emit
functions partitioned based on header dependencies. V3EmitC having to
deal with only AstCFunc instances and no other magic will facilitate
this.

In this patch:
- We construct AstCFuncs for each thread entry point in
V3Partition::finalize and move AstMTaskBody nodes under these functions.
- Add the invocation of the threads as text statements within the
AstExecGraph, so they are still invoked where the exec graph is located.
(the entry point functions are still referenced via AstCCall or
AstAddOrCFunc, so lazy declarations of referenced functions are created
automatically).
- Explicitly handle MTask state variables (VlMTaskVertex in
verilated_threads.h) within Verilator, so no need to text bash a lot of
these any more (some text refs still remain but they are all created
next to each other within V3Partition.cpp).

The effect of all this on the emitted code should be nothing but some
identifier/ordering changes. No functional change intended.
---
 src/V3Ast.h                                   |  23 +-
 src/V3AstNodes.cpp                            |  27 +-
 src/V3AstNodes.h                              |   8 +-
 src/V3EmitC.cpp                               | 226 ++-------
 src/V3EmitCBase.h                             |   4 +
 src/V3Partition.cpp                           | 436 +++++++++++++-----
 src/V3Partition.h                             |   1 -
 src/V3PartitionGraph.h                        |  23 +-
 src/Verilator.cpp                             |  15 +-
 .../t/t_inst_tree_inl0_pub1_norelcfuncs.pl    |   2 +-
 test_regress/t/t_inst_tree_inl1_pub1.pl       |   6 +-
 11 files changed, 400 insertions(+), 371 deletions(-)

diff --git a/src/V3Ast.h b/src/V3Ast.h
index a8628dee1..c72e62b3a 100644
--- a/src/V3Ast.h
+++ b/src/V3Ast.h
@@ -457,6 +457,7 @@ public:
         // Internal types for mid-steps
         SCOPEPTR,
         CHARPTR,
+        MTASKSTATE,
         // Unsigned and two state; fundamental types
         UINT32,
         UINT64,
@@ -467,18 +468,19 @@ public:
     };
     enum en m_e;
     const char* ascii() const {
-        static const char* const names[] = {
-            "%E-unk", "bit",     "byte",  "chandle",        "event", "int",    "integer",
-            "logic",  "longint", "real",  "shortint",       "time",  "string", "VerilatedScope*",
-            "char*",  "IData",   "QData", "LOGIC_IMPLICIT", " MAX"};
+        static const char* const names[]
+            = {"%E-unk",       "bit",     "byte",   "chandle",         "event",
+               "int",          "integer", "logic",  "longint",         "real",
+               "shortint",     "time",    "string", "VerilatedScope*", "char*",
+               "VlMTaskState", "IData",   "QData",  "LOGIC_IMPLICIT",  " MAX"};
         return names[m_e];
     }
     const char* dpiType() const {
         static const char* const names[]
-            = {"%E-unk",      "svBit",    "char",        "void*",  "char",  "int",
-               "%E-integer",  "svLogic",  "long long",   "double", "short", "%E-time",
-               "const char*", "dpiScope", "const char*", "IData",  "QData", "%E-logic-implicit",
-               " MAX"};
+            = {"%E-unk",        "svBit",      "char",        "void*",           "char",
+               "int",           "%E-integer", "svLogic",     "long long",       "double",
+               "short",         "%E-time",    "const char*", "dpiScope",        "const char*",
+               "%E-mtaskstate", "IData",      "QData",       "%E-logic-implct", " MAX"};
         return names[m_e];
     }
     static void selfTest() {
@@ -511,6 +513,7 @@ public:
         case STRING: return 64;  // opaque  // Just the pointer, for today
         case SCOPEPTR: return 0;  // opaque
         case CHARPTR: return 0;  // opaque
+        case MTASKSTATE: return 0;  // opaque
         case UINT32: return 32;
         case UINT64: return 64;
         default: return 0;
@@ -549,11 +552,13 @@ public:
                 || m_e == DOUBLE || m_e == SHORTINT || m_e == UINT32 || m_e == UINT64);
     }
     bool isOpaque() const {  // IE not a simple number we can bit optimize
-        return (m_e == STRING || m_e == SCOPEPTR || m_e == CHARPTR || m_e == DOUBLE);
+        return (m_e == STRING || m_e == SCOPEPTR || m_e == CHARPTR || m_e == MTASKSTATE
+                || m_e == DOUBLE);
     }
     bool isDouble() const { return m_e == DOUBLE; }
     bool isEventValue() const { return m_e == EVENTVALUE; }
     bool isString() const { return m_e == STRING; }
+    bool isMTaskState() const { return m_e == MTASKSTATE; }
 };
 inline bool operator==(const AstBasicDTypeKwd& lhs, const AstBasicDTypeKwd& rhs) {
     return lhs.m_e == rhs.m_e;
diff --git a/src/V3AstNodes.cpp b/src/V3AstNodes.cpp
index 4160df3e1..399ceb3b9 100644
--- a/src/V3AstNodes.cpp
+++ b/src/V3AstNodes.cpp
@@ -238,26 +238,11 @@ AstNodeBiop* AstEqWild::newTyped(FileLine* fl, AstNode* lhsp, AstNode* rhsp) {
 }
 
 AstExecGraph::AstExecGraph(FileLine* fileline)
-    : ASTGEN_SUPER_ExecGraph(fileline) {
-    m_depGraphp = new V3Graph;
-}
+    : ASTGEN_SUPER_ExecGraph(fileline)
+    , m_depGraphp{new V3Graph} {}
+
 AstExecGraph::~AstExecGraph() { VL_DO_DANGLING(delete m_depGraphp, m_depGraphp); }
 
-std::vector<const ExecMTask*> AstExecGraph::rootMTasks() {
-    // Build the list of initial mtasks to start
-    std::vector<const ExecMTask*> execMTasks;
-
-    for (const V3GraphVertex* vxp = depGraphp()->verticesBeginp(); vxp;
-         vxp = vxp->verticesNextp()) {
-        const ExecMTask* etp = dynamic_cast<const ExecMTask*>(vxp);
-        if (etp->threadRoot()) execMTasks.push_back(etp);
-    }
-    UASSERT_OBJ(execMTasks.size() <= static_cast<unsigned>(v3Global.opt.threads()), this,
-                "More root mtasks than available threads");
-
-    return execMTasks;
-}
-
 AstNode* AstInsideRange::newAndFromInside(AstNode* exprp, AstNode* lhsp, AstNode* rhsp) {
     AstNode* ap = new AstGte(fileline(), exprp->cloneTree(true), lhsp);
     AstNode* bp = new AstLte(fileline(), exprp->cloneTree(true), rhsp);
@@ -717,10 +702,12 @@ AstNodeDType::CTypeRecursed AstNodeDType::cTypeRecurse(bool compound) const {
             info.m_type = "const char*";
         } else if (bdtypep->keyword() == AstBasicDTypeKwd::SCOPEPTR) {
             info.m_type = "const VerilatedScope*";
-        } else if (bdtypep->keyword() == AstBasicDTypeKwd::DOUBLE) {
+        } else if (bdtypep->keyword().isDouble()) {
             info.m_type = "double";
-        } else if (bdtypep->keyword() == AstBasicDTypeKwd::STRING) {
+        } else if (bdtypep->keyword().isString()) {
             info.m_type = "std::string";
+        } else if (bdtypep->keyword().isMTaskState()) {
+            info.m_type = "VlMTaskVertex";
         } else if (dtypep->widthMin() <= 8) {  // Handle unpacked arrays; not bdtypep->width
             info.m_type = "CData" + bitvec;
         } else if (dtypep->widthMin() <= 16) {
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index 6416bb965..7f583f929 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -2070,7 +2070,8 @@ public:
     // (Slow) recurse down to find basic data type (Note don't need virtual -
     // AstVar isn't a NodeDType)
     AstBasicDType* basicp() const { return subDTypep()->basicp(); }
-    // op3 = Initial value that never changes (static const)
+    // op3 = Initial value that never changes (static const), or constructor argument for
+    // MTASKSTATE variables
     AstNode* valuep() const { return op3p(); }
     // It's valuep(), not constp(), as may be more complicated than an AstConst
     void valuep(AstNode* nodep) { setOp3p(nodep); }
@@ -9045,7 +9046,8 @@ class AstExecGraph final : public AstNode {
     // them without traversing the graph (it's not always needed to
     // traverse the graph.)
 private:
-    V3Graph* m_depGraphp;  // contains ExecMTask's
+    V3Graph* const m_depGraphp;  // contains ExecMTask's
+
 public:
     explicit AstExecGraph(FileLine* fl);
     ASTNODE_NODE_FUNCS_NO_DTOR(ExecGraph)
@@ -9057,7 +9059,7 @@ public:
     const V3Graph* depGraphp() const { return m_depGraphp; }
     V3Graph* mutableDepGraphp() { return m_depGraphp; }
     void addMTaskBody(AstMTaskBody* bodyp) { addOp1p(bodyp); }
-    std::vector<const ExecMTask*> rootMTasks();
+    void addStmtsp(AstNode* stmtp) { addOp2p(stmtp); }
 };
 
 class AstSplitPlaceholder final : public AstNode {
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 128ff512b..290608961 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -1429,18 +1429,6 @@ class EmitCLazyDecls final : public AstNVisitor {
         lazyDeclare(nodep->funcp());
     }
 
-    virtual void visit(AstExecGraph* nodep) override {
-        if (nodep->user2SetOnce()) return;  // Already declared
-        // Build the list of initial mtasks to start
-        for (const ExecMTask* mtp : nodep->rootMTasks()) {
-            m_emitter.puts("void ");
-            m_emitter.puts(EmitCBaseVisitor::topClassName() + "__"
-                           + EmitCBaseVisitor::protect(mtp->cFuncName()));
-            m_emitter.puts("(void* voidSelf, bool even_cycle);\n");
-            m_needsBlankLine = true;
-        }
-    }
-
     virtual void visit(AstVarRef* nodep) override {
         AstVar* const varp = nodep->varp();
         // Only constant pool symbols are lazy declared for now ...
@@ -1574,93 +1562,6 @@ class EmitCImp final : EmitCStmts {
         return ofp;
     }
 
-    // Returns the number of cross-thread dependencies into mtaskp.
-    // If >0, mtaskp must test whether its prereqs are done before starting,
-    // and may need to block.
-    static uint32_t packedMTaskMayBlock(const ExecMTask* mtaskp) {
-        uint32_t result = 0;
-        for (V3GraphEdge* edgep = mtaskp->inBeginp(); edgep; edgep = edgep->inNextp()) {
-            const ExecMTask* prevp = dynamic_cast<ExecMTask*>(edgep->fromp());
-            if (prevp->thread() != mtaskp->thread()) ++result;
-        }
-        return result;
-    }
-
-    void emitMTaskBody(AstMTaskBody* nodep) {
-        ExecMTask* curExecMTaskp = nodep->execMTaskp();
-        if (packedMTaskMayBlock(curExecMTaskp)) {
-            puts("vlSelf->__Vm_mt_" + cvtToStr(curExecMTaskp->id())
-                 + ".waitUntilUpstreamDone(even_cycle);\n");
-        }
-
-        string recName;
-        if (v3Global.opt.profThreads()) {
-            recName = "__Vprfthr_" + cvtToStr(curExecMTaskp->id());
-            puts("VlProfileRec* " + recName + " = nullptr;\n");
-            // Leave this if() here, as don't want to call VL_RDTSC_Q unless profiling
-            puts("if (VL_UNLIKELY(vlSelf->__Vm_profile_cycle_start)) {\n");
-            puts(recName + " = vlSelf->__Vm_threadPoolp->profileAppend();\n");
-            puts(recName + "->startRecord(VL_RDTSC_Q() - vlSelf->__Vm_profile_cycle_start,");
-            puts(" " + cvtToStr(curExecMTaskp->id()) + ",");
-            puts(" " + cvtToStr(curExecMTaskp->cost()) + ");\n");
-            puts("}\n");
-        }
-        puts("Verilated::mtaskId(" + cvtToStr(curExecMTaskp->id()) + ");\n");
-
-        // The actual body of calls to leaf functions
-        iterateAndNextNull(nodep->stmtsp());
-
-        if (v3Global.opt.profThreads()) {
-            // Leave this if() here, as don't want to call VL_RDTSC_Q unless profiling
-            puts("if (VL_UNLIKELY(" + recName + ")) {\n");
-            puts(recName + "->endRecord(VL_RDTSC_Q() - vlSelf->__Vm_profile_cycle_start);\n");
-            puts("}\n");
-        }
-
-        // Flush message queue
-        puts("Verilated::endOfThreadMTask(vlSymsp->__Vm_evalMsgQp);\n");
-
-        // For any downstream mtask that's on another thread, bump its
-        // counter and maybe notify it.
-        for (V3GraphEdge* edgep = curExecMTaskp->outBeginp(); edgep; edgep = edgep->outNextp()) {
-            const ExecMTask* nextp = dynamic_cast<ExecMTask*>(edgep->top());
-            if (nextp->thread() != curExecMTaskp->thread()) {
-                puts("vlSelf->__Vm_mt_" + cvtToStr(nextp->id())
-                     + ".signalUpstreamDone(even_cycle);\n");
-            }
-        }
-
-        // Run the next mtask inline
-        const ExecMTask* nextp = curExecMTaskp->packNextp();
-        if (nextp) {
-            emitMTaskBody(nextp->bodyp());
-        } else {
-            // Unblock the fake "final" mtask
-            puts("vlSelf->__Vm_mt_final.signalUpstreamDone(even_cycle);\n");
-        }
-    }
-
-    virtual void visit(AstMTaskBody* nodep) override {
-        VL_RESTORER(m_useSelfForThis);
-        maybeSplit();
-        splitSizeInc(10);
-
-        puts("\n");
-        for (const ExecMTask* mtp = nodep->execMTaskp(); mtp; mtp = mtp->packNextp()) {
-            m_lazyDecls.emit(mtp->bodyp());
-        }
-        puts("void ");
-        puts(topClassName() + "__" + protect(nodep->execMTaskp()->cFuncName()));
-        puts("(void* voidSelf, bool even_cycle) {\n");
-        puts(topClassName() + "* const vlSelf = static_cast<" + topClassName()
-             + "*>(voidSelf);\n");
-        m_useSelfForThis = true;
-        puts(symClassAssign());
-        emitMTaskBody(nodep);
-        ensureNewLine();
-        puts("}\n");
-    }
-
     //---------------------------------------
     // VISITORS
     using EmitCStmts::visit;  // Suppress hidden overloaded virtual function warning
@@ -1734,6 +1635,12 @@ class EmitCImp final : EmitCStmts {
         if (nodep->ifdef() != "") puts("#endif  // " + nodep->ifdef() + "\n");
     }
 
+    virtual void visit(AstMTaskBody* nodep) override {
+        VL_RESTORER(m_useSelfForThis);
+        m_useSelfForThis = true;
+        iterateChildrenConst(nodep);
+    }
+
     void emitChangeDet() {
         putsDecoration("// Change detection\n");
         puts("QData __req = false;  // Logically a bool\n");  // But not because it results in
@@ -1833,34 +1740,8 @@ class EmitCImp final : EmitCStmts {
                     "ExecGraph should be a singleton!");
         // The location of the AstExecGraph within the containing _eval()
         // function is where we want to invoke the graph and wait for it to
-        // complete. Do that now.
-        //
-        // Don't recurse to children -- this isn't the place to emit
-        // function definitions for the nested CFuncs. We'll do that at the
-        // end.
-        puts("vlSelf->__Vm_even_cycle = !vlSelf->__Vm_even_cycle;\n");
-
-        // Build the list of initial mtasks to start
-        std::vector<const ExecMTask*> execMTasks = nodep->rootMTasks();
-
-        if (!execMTasks.empty()) {
-            for (uint32_t i = 0; i < execMTasks.size(); ++i) {
-                const bool runInline = (i == execMTasks.size() - 1);
-                const string protName
-                    = topClassName() + "__" + protect(execMTasks[i]->cFuncName());
-                if (runInline) {
-                    // The thread calling eval() will run this mtask inline,
-                    // along with its packed successors.
-                    puts(protName + "(vlSelf, vlSelf->__Vm_even_cycle);\n");
-                    puts("Verilated::mtaskId(0);\n");
-                } else {
-                    // The other N-1 go to the thread pool.
-                    puts("vlSelf->__Vm_threadPoolp->workerp(" + cvtToStr(i) + ")->addTask("
-                         + protName + ", vlSelf, vlSelf->__Vm_even_cycle);\n");
-                }
-            }
-            puts("vlSelf->__Vm_mt_final.waitUntilUpstreamDone(vlSelf->__Vm_even_cycle);\n");
-        }
+        // complete. Emitting the children does just that.
+        iterateChildrenConst(nodep);
     }
 
     //---------------------------------------
@@ -2015,8 +1896,8 @@ class EmitCImp final : EmitCStmts {
     void emitSettleLoop(bool initial);
     void emitWrapEval();
     void emitWrapFast();
-    void emitMTaskState();
-    void emitMTaskVertexCtors(bool* firstp);
+    void emitThreadingState();
+    void emitThreadingCtors(bool* firstp);
     void emitIntTop(const AstNodeModule* modp);
     void emitInt(AstNodeModule* modp);
     void maybeSplit();
@@ -2085,6 +1966,7 @@ void EmitCStmts::emitVarDecl(const AstVar* nodep, const string& prefixIfImp) {
         if (nodep->isWide()) puts("," + cvtToStr(nodep->widthWords()));
         puts(");\n");
     } else {
+        if (basicp && basicp->keyword().isMTaskState()) { m_ctorVarsVec.push_back(nodep); }
         // strings and other fundamental c types
         if (nodep->isFuncLocal() && nodep->isString()) {
             const string name = nodep->name();
@@ -2114,13 +1996,19 @@ void EmitCStmts::emitCtorSep(bool* firstp) {
 void EmitCStmts::emitVarCtors(bool* firstp) {
     if (!m_ctorVarsVec.empty()) {
         ofp()->indentInc();
-        puts("\n");
+        if (*firstp) puts("\n");
         for (const AstVar* varp : m_ctorVarsVec) {
-            bool isArray = !VN_CAST(varp->dtypeSkipRefp(), BasicDType);
-            if (isArray) {
+            const AstBasicDType* const dtypep = VN_CAST(varp->dtypeSkipRefp(), BasicDType);
+            if (!dtypep) {
                 puts("// Skipping array: ");
                 puts(varp->nameProtect());
                 puts("\n");
+            } else if (dtypep->keyword().isMTaskState()) {
+                emitCtorSep(firstp);
+                puts(varp->nameProtect());
+                puts("(");
+                iterate(varp->valuep());
+                puts(")");
             } else {
                 emitCtorSep(firstp);
                 puts(varp->nameProtect());
@@ -2555,36 +2443,17 @@ void EmitCImp::emitCoverageDecl(AstNodeModule*) {
     }
 }
 
-void EmitCImp::emitMTaskVertexCtors(bool* firstp) {
-    AstExecGraph* execGraphp = v3Global.rootp()->execGraphp();
-    UASSERT_OBJ(execGraphp, v3Global.rootp(), "Root should have an execGraphp");
-    const V3Graph* depGraphp = execGraphp->depGraphp();
-
-    unsigned finalEdgesInCt = 0;
-    for (const V3GraphVertex* vxp = depGraphp->verticesBeginp(); vxp; vxp = vxp->verticesNextp()) {
-        const ExecMTask* mtp = dynamic_cast<const ExecMTask*>(vxp);
-        unsigned edgesInCt = packedMTaskMayBlock(mtp);
-        if (packedMTaskMayBlock(mtp) > 0) {
-            emitCtorSep(firstp);
-            puts("__Vm_mt_" + cvtToStr(mtp->id()) + "(" + cvtToStr(edgesInCt) + ")");
-        }
-        // Each mtask with no packed successor will become a dependency
-        // for the final node:
-        if (!mtp->packNextp()) ++finalEdgesInCt;
-    }
-
-    emitCtorSep(firstp);
-    puts("__Vm_mt_final(" + cvtToStr(finalEdgesInCt) + ")");
-
-    // This will flip to 'true' before the start of the 0th cycle.
+void EmitCImp::emitThreadingCtors(bool* firstp) {
+    ofp()->indentInc();
     emitCtorSep(firstp);
     puts("__Vm_threadPoolp(nullptr)");
+    emitCtorSep(firstp);
+    puts("__Vm_even_cycle(false)");
     if (v3Global.opt.profThreads()) {
         emitCtorSep(firstp);
         puts("__Vm_profile_cycle_start(0)");
     }
-    emitCtorSep(firstp);
-    puts("__Vm_even_cycle(false)");
+    ofp()->indentDec();
 }
 
 void EmitCImp::emitCtorImp(AstNodeModule* modp) {
@@ -2612,9 +2481,10 @@ void EmitCImp::emitCtorImp(AstNodeModule* modp) {
     } else {
         puts(modName + "::" + modName + "(const char* _vcname__)\n");
         puts("    : VerilatedModule(_vcname__)\n");
+        first = false;  // printed the first ':'
     }
     emitVarCtors(&first);
-    if (modp->isTop() && v3Global.opt.mtasks()) emitMTaskVertexCtors(&first);
+    if (modp->isTop() && v3Global.opt.mtasks()) emitThreadingCtors(&first);
 
     puts(" {\n");
     emitCellCtors(modp);
@@ -2804,9 +2674,11 @@ void EmitCImp::emitSavableImp(AstNodeModule* modp) {
                             puts("; ++" + ivar + ") {\n");
                             elementp = arrayp->subDTypep()->skipRefp();
                         }
+                        const AstBasicDType* const basicp = elementp->basicp();
+                        // Do not save MTask state, only matters within an evaluation
+                        if (basicp && basicp->keyword().isMTaskState()) continue;
                         // Want to detect types that are represented as arrays
                         // (i.e. packed types of more than 64 bits).
-                        AstBasicDType* basicp = elementp->basicp();
                         if (elementp->isWide()
                             && !(basicp && basicp->keyword() == AstBasicDTypeKwd::STRING)) {
                             int vecnum = vects++;
@@ -3249,26 +3121,13 @@ void EmitCStmts::emitSortedVarList(const VarVec& anons, const VarVec& nonanons,
     }
 }
 
-void EmitCImp::emitMTaskState() {
+void EmitCImp::emitThreadingState() {
     ofp()->putsPrivate(false);  // Accessed from loose function
     AstExecGraph* execGraphp = v3Global.rootp()->execGraphp();
     UASSERT_OBJ(execGraphp, v3Global.rootp(), "Root should have an execGraphp");
 
-    const V3Graph* depGraphp = execGraphp->depGraphp();
-    for (const V3GraphVertex* vxp = depGraphp->verticesBeginp(); vxp; vxp = vxp->verticesNextp()) {
-        const ExecMTask* mtp = dynamic_cast<const ExecMTask*>(vxp);
-        if (packedMTaskMayBlock(mtp) > 0) {
-            puts("VlMTaskVertex __Vm_mt_" + cvtToStr(mtp->id()) + ";\n");
-        }
-    }
-    // This fake mtask depends on all the real ones.  We use it to block
-    // eval() until all mtasks are done.
-    //
-    // In the future we might allow _eval() to return before the graph is
-    // fully done executing, for "half wave" scheduling. For now we wait
-    // for all mtasks though.
-    puts("VlMTaskVertex __Vm_mt_final;\n");
     puts("VlThreadPool* __Vm_threadPoolp;\n");
+    puts("bool __Vm_even_cycle;\n");
 
     if (v3Global.opt.profThreads()) {
         // rdtsc() at current cycle start
@@ -3278,8 +3137,6 @@ void EmitCImp::emitMTaskState() {
         // Track our position in the cache warmup and actual profile window
         puts("vluint32_t __Vm_profile_window_ct;\n");
     }
-
-    puts("bool __Vm_even_cycle;\n");
 }
 
 void EmitCImp::emitIntTop(const AstNodeModule* modp) {
@@ -3380,7 +3237,7 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
         if (v3Global.opt.inhibitSim()) {
             puts("bool __Vm_inhibitSim;  ///< Set true to disable evaluation of module\n");
         }
-        if (v3Global.opt.mtasks()) emitMTaskState();
+        if (v3Global.opt.mtasks()) emitThreadingState();
     }
     emitCoverageDecl(modp);  // may flip public/private
 
@@ -3634,23 +3491,6 @@ void EmitCImp::mainImp(AstNodeModule* modp, bool slow) {
         m_modp = modp;
     }
 
-    if (m_fast && modp->isTop() && v3Global.opt.mtasks()) {
-        // Make a final pass and emit function definitions for the mtasks
-        // in the ExecGraph
-        AstExecGraph* execGraphp = v3Global.rootp()->execGraphp();
-        const V3Graph* depGraphp = execGraphp->depGraphp();
-        for (const V3GraphVertex* vxp = depGraphp->verticesBeginp(); vxp;
-             vxp = vxp->verticesNextp()) {
-            const ExecMTask* mtaskp = dynamic_cast<const ExecMTask*>(vxp);
-            if (mtaskp->threadRoot()) {
-                // Only define one function for all the mtasks packed on
-                // a given thread. We'll name this function after the
-                // root mtask though it contains multiple mtasks' worth
-                // of logic.
-                iterate(mtaskp->bodyp());
-            }
-        }
-    }
     VL_DO_CLEAR(delete m_ofp, m_ofp = nullptr);
 }
 
diff --git a/src/V3EmitCBase.h b/src/V3EmitCBase.h
index b125e180c..005956543 100644
--- a/src/V3EmitCBase.h
+++ b/src/V3EmitCBase.h
@@ -53,6 +53,10 @@ public:
         return VIdProtect::protectWordsIf(name, doIt);
     }
     static string ifNoProtect(const string& in) { return v3Global.opt.protectIds() ? "" : in; }
+    static string voidSelfAssign() {
+        return topClassName() + "* const __restrict vlSelf VL_ATTR_UNUSED = static_cast<"
+               + topClassName() + "*>(voidSelf);\n";
+    }
     static string symClassName() { return v3Global.opt.prefix() + "_" + protect("_Syms"); }
     static string symClassVar() { return symClassName() + "* __restrict vlSymsp"; }
     static string symClassAssign() {
diff --git a/src/V3Partition.cpp b/src/V3Partition.cpp
index 3d443f4ca..d00870844 100644
--- a/src/V3Partition.cpp
+++ b/src/V3Partition.cpp
@@ -17,6 +17,7 @@
 #include "config_build.h"
 #include "verilatedos.h"
 
+#include "V3EmitCBase.h"
 #include "V3Os.h"
 #include "V3File.h"
 #include "V3GraphAlg.h"
@@ -1997,6 +1998,48 @@ private:
     VL_DEBUG_FUNC;
 };
 
+//######################################################################
+// ThreadSchedule
+
+class PartPackMTasks;
+
+// The thread schedule, containing all information needed later. Note that this is a simple
+// aggregate data type and the only way to get hold of an instance of it is via
+// PartPackMTasks::pack, which is moved from there and is const, which means we can only acquire a
+// const reference to is so no further modifications are allowed, so all members are public
+// (attributes).
+class ThreadSchedule final {
+public:
+    // Allocation of sequence of MTasks to threads. Can be considered a map from thread ID to
+    // the sequence of MTasks to be executed by that thread.
+    std::vector<std::vector<const ExecMTask*>> threads;
+
+    // Map from MTask to ID of thread it is assigned to.
+    std::unordered_map<const ExecMTask*, uint32_t> threadId;
+
+private:
+    friend class PartPackMTasks;
+
+    explicit ThreadSchedule(uint32_t nThreads)
+        : threads{nThreads} {}
+    VL_UNCOPYABLE(ThreadSchedule);  // But movable
+    ThreadSchedule(ThreadSchedule&&) = default;
+    ThreadSchedule& operator=(ThreadSchedule&&) = default;
+
+public:
+    // Returns the number of cross-thread dependencies of the given MTask. If > 0, the MTask must
+    // test whether its dependencies are ready before starting, and therefore may need to block.
+    uint32_t crossThreadDependencies(const ExecMTask* mtaskp) const {
+        const uint32_t thisThreadId = threadId.at(mtaskp);
+        uint32_t result = 0;
+        for (V3GraphEdge* edgep = mtaskp->inBeginp(); edgep; edgep = edgep->inNextp()) {
+            const ExecMTask* const prevp = dynamic_cast<ExecMTask*>(edgep->fromp());
+            if (threadId.at(prevp) != thisThreadId) ++result;
+        }
+        return result;
+    }
+};
+
 //######################################################################
 // PartPackMTasks
 
@@ -2016,49 +2059,45 @@ private:
 // thread A checks the end time of an mtask running on thread B. This extra
 // "padding" avoids tight "layovers" at cross-thread dependencies.
 class PartPackMTasks final {
-private:
+    // CONSTANTS
+    static constexpr uint32_t UNASSIGNED = 0xffffffff;
+
     // TYPES
     struct MTaskState {
-        uint32_t completionTime;  // Estimated time this mtask will complete
+        uint32_t completionTime = 0;  // Estimated time this mtask will complete
+        uint32_t threadId = UNASSIGNED;  // Thread id this MTask is assigned to
+        const ExecMTask* nextp = nullptr;  // Next MTask on same thread after this
     };
+
     struct MTaskCmp {
-        bool operator()(const ExecMTask* ap, ExecMTask* bp) const { return ap->id() < bp->id(); }
+        bool operator()(const ExecMTask* ap, const ExecMTask* bp) const {
+            return ap->id() < bp->id();
+        }
     };
 
     // MEMBERS
-    V3Graph* m_mtasksp;  // Mtask graph
-    uint32_t m_nThreads;  // Number of threads
-    uint32_t m_sandbagNumerator;  // Numerator padding for est runtime
-    uint32_t m_sandbagDenom;  // Denomerator padding for est runtime
+    const uint32_t m_nThreads;  // Number of threads
+    const uint32_t m_sandbagNumerator;  // Numerator padding for est runtime
+    const uint32_t m_sandbagDenom;  // Denominator padding for est runtime
 
-    using MTaskStateMap = std::unordered_map<const ExecMTask*, MTaskState>;
-    MTaskStateMap m_mtaskState;  // State for each mtask.
-
-    MTaskCmp m_mtaskCmp;  // Comparison functor
-    using ReadyMTasks = std::set<ExecMTask*, MTaskCmp&>;
-    ReadyMTasks m_ready;  // MTasks ready to be assigned next; all their
-    //                    // dependencies are already assigned.
-
-    std::vector<ExecMTask*> m_prevMTask;  // Previous mtask scheduled to each thread.
-    std::vector<uint32_t> m_busyUntil;  // Time each thread is occupied until
+    std::unordered_map<const ExecMTask*, MTaskState> m_mtaskState;  // State for each mtask.
 
 public:
     // CONSTRUCTORS
-    explicit PartPackMTasks(V3Graph* mtasksp, uint32_t nThreads = v3Global.opt.threads(),
+    explicit PartPackMTasks(uint32_t nThreads = v3Global.opt.threads(),
                             unsigned sandbagNumerator = 30, unsigned sandbagDenom = 100)
-        : m_mtasksp{mtasksp}
-        , m_nThreads{nThreads}
+        : m_nThreads{nThreads}
         , m_sandbagNumerator{sandbagNumerator}
-        , m_sandbagDenom{sandbagDenom}
-        , m_ready{m_mtaskCmp} {}
+        , m_sandbagDenom{sandbagDenom} {}
     ~PartPackMTasks() = default;
 
+private:
     // METHODS
-    uint32_t completionTime(const ExecMTask* mtaskp, uint32_t thread) {
+    uint32_t completionTime(const ExecMTask* mtaskp, uint32_t threadId) {
         const MTaskState& state = m_mtaskState[mtaskp];
-        UASSERT(mtaskp->thread() != 0xffffffff, "Mtask should have assigned thread");
-        if (thread == mtaskp->thread()) {
-            // No overhead on native thread
+        UASSERT(state.threadId != UNASSIGNED, "Mtask should have assigned thread");
+        if (threadId == state.threadId) {
+            // No overhead on same thread
             return state.completionTime;
         }
 
@@ -2068,157 +2107,162 @@ public:
             = state.completionTime + (m_sandbagNumerator * mtaskp->cost()) / m_sandbagDenom;
 
         // If task B is packed after task A on thread 0, don't let thread 1
-        // think that A finishes later than thread 0 thinks that B
+        // think that A finishes earlier than thread 0 thinks that B
         // finishes, otherwise we get priority inversions and fail the self
         // test.
-        if (mtaskp->packNextp()) {
-            uint32_t successorEndTime = completionTime(mtaskp->packNextp(), mtaskp->thread());
+        if (state.nextp) {
+            const uint32_t successorEndTime = completionTime(state.nextp, state.threadId);
             if ((sandbaggedEndTime >= successorEndTime) && (successorEndTime > 1)) {
                 sandbaggedEndTime = successorEndTime - 1;
             }
         }
 
-        UINFO(6, "Sandbagged end time for " << mtaskp->name() << " on th " << thread << " = "
+        UINFO(6, "Sandbagged end time for " << mtaskp->name() << " on th " << threadId << " = "
                                             << sandbaggedEndTime << endl);
         return sandbaggedEndTime;
     }
 
-    void setCompletionTime(ExecMTask* mtaskp, uint32_t time) {
-        MTaskState& state = m_mtaskState[mtaskp];
-        state.completionTime = time;
+    bool isReady(const ExecMTask* mtaskp) {
+        for (V3GraphEdge* edgeInp = mtaskp->inBeginp(); edgeInp; edgeInp = edgeInp->inNextp()) {
+            const ExecMTask* const prevp = dynamic_cast<ExecMTask*>(edgeInp->fromp());
+            if (m_mtaskState[prevp].threadId == UNASSIGNED) {
+                // This predecessor is not assigned yet
+                return false;
+            }
+        }
+        return true;
     }
 
-    void go() {
+public:
+    // Pack an MTasks from given graph into m_nThreads threads, return the schedule.
+    const ThreadSchedule pack(const V3Graph& mtaskGraph) {
+        // The result
+        ThreadSchedule schedule(m_nThreads);
+
+        // Time each thread is occupied until
+        std::vector<uint32_t> busyUntil(m_nThreads, 0);
+
+        // MTasks ready to be assigned next. All their dependencies are already assigned.
+        std::set<const ExecMTask*, MTaskCmp> readyMTasks;
+
         // Build initial ready list
-        for (V3GraphVertex* vxp = m_mtasksp->verticesBeginp(); vxp; vxp = vxp->verticesNextp()) {
-            ExecMTask* mtaskp = dynamic_cast<ExecMTask*>(vxp);
-            if (vxp->inEmpty()) m_ready.insert(mtaskp);
+        for (V3GraphVertex* vxp = mtaskGraph.verticesBeginp(); vxp; vxp = vxp->verticesNextp()) {
+            const ExecMTask* const mtaskp = dynamic_cast<ExecMTask*>(vxp);
+            if (isReady(mtaskp)) readyMTasks.insert(mtaskp);
         }
 
-        m_prevMTask.clear();
-        m_prevMTask.resize(m_nThreads);
-        m_busyUntil.clear();
-        m_busyUntil.resize(m_nThreads);
+        // Clear algorithm state
+        m_mtaskState.clear();
 
-        while (!m_ready.empty()) {
+        while (!readyMTasks.empty()) {
             // For each task in the ready set, compute when it might start
             // on each thread (in that thread's local time frame.)
             uint32_t bestTime = 0xffffffff;
-            uint32_t bestTh = 0;
-            ExecMTask* bestMtaskp = nullptr;
-            for (uint32_t th = 0; th < m_nThreads; ++th) {
-                for (ReadyMTasks::iterator taskIt = m_ready.begin(); taskIt != m_ready.end();
-                     ++taskIt) {
-                    uint32_t timeBegin = m_busyUntil[th];
+            uint32_t bestThreadId = 0;
+            const ExecMTask* bestMtaskp = nullptr;  // Todo: const ExecMTask*
+            for (uint32_t threadId = 0; threadId < m_nThreads; ++threadId) {
+                for (const ExecMTask* const mtaskp : readyMTasks) {
+                    uint32_t timeBegin = busyUntil[threadId];
                     if (timeBegin > bestTime) {
-                        UINFO(6, "th " << th << " busy until " << timeBegin
+                        UINFO(6, "th " << threadId << " busy until " << timeBegin
                                        << ", later than bestTime " << bestTime
                                        << ", skipping thread.\n");
                         break;
                     }
-                    ExecMTask* taskp = *taskIt;
-                    for (V3GraphEdge* edgep = taskp->inBeginp(); edgep; edgep = edgep->inNextp()) {
-                        ExecMTask* priorp = dynamic_cast<ExecMTask*>(edgep->fromp());
-                        uint32_t priorEndTime = completionTime(priorp, th);
+                    for (V3GraphEdge* edgep = mtaskp->inBeginp(); edgep;
+                         edgep = edgep->inNextp()) {
+                        const ExecMTask* const priorp = dynamic_cast<ExecMTask*>(edgep->fromp());
+                        const uint32_t priorEndTime = completionTime(priorp, threadId);
                         if (priorEndTime > timeBegin) timeBegin = priorEndTime;
                     }
-                    UINFO(6, "Task " << taskp->name() << " start at " << timeBegin << " on thread "
-                                     << th << endl);
+                    UINFO(6, "Task " << mtaskp->name() << " start at " << timeBegin
+                                     << " on thread " << threadId << endl);
                     if ((timeBegin < bestTime)
                         || ((timeBegin == bestTime)
                             && bestMtaskp  // Redundant, but appeases static analysis tools
-                            && (taskp->priority() > bestMtaskp->priority()))) {
+                            && (mtaskp->priority() > bestMtaskp->priority()))) {
                         bestTime = timeBegin;
-                        bestTh = th;
-                        bestMtaskp = taskp;
+                        bestThreadId = threadId;
+                        bestMtaskp = mtaskp;
                     }
                 }
             }
 
-            if (!bestMtaskp) v3fatalSrc("Should have found some task");
-            UINFO(6, "Will schedule " << bestMtaskp->name() << " onto thread " << bestTh << endl);
-            uint32_t bestEndTime = bestTime + bestMtaskp->cost();
-            setCompletionTime(bestMtaskp, bestEndTime);
+            UASSERT(bestMtaskp, "Should have found some task");
+            UINFO(6, "Will schedule " << bestMtaskp->name() << " onto thread " << bestThreadId
+                                      << endl);
+
+            // Reference to thread in schedule we are assigning this MTask to.
+            std::vector<const ExecMTask*>& bestThread = schedule.threads[bestThreadId];
+
+            // Update algorithm state
+            const uint32_t bestEndTime = bestTime + bestMtaskp->cost();
+            m_mtaskState[bestMtaskp].completionTime = bestEndTime;
+            m_mtaskState[bestMtaskp].threadId = bestThreadId;
+            if (!bestThread.empty()) { m_mtaskState[bestThread.back()].nextp = bestMtaskp; }
+            busyUntil[bestThreadId] = bestEndTime;
+
+            // Add the MTask to the schedule
+            bestThread.push_back(bestMtaskp);
+            schedule.threadId[bestMtaskp] = bestThreadId;
 
             // Update the ready list
-            size_t erased = m_ready.erase(bestMtaskp);
+            const size_t erased = readyMTasks.erase(bestMtaskp);
             UASSERT_OBJ(erased > 0, bestMtaskp, "Should have erased something?");
             for (V3GraphEdge* edgeOutp = bestMtaskp->outBeginp(); edgeOutp;
                  edgeOutp = edgeOutp->outNextp()) {
-                ExecMTask* nextp = dynamic_cast<ExecMTask*>(edgeOutp->top());
-
-                UASSERT(nextp->thread() == 0xffffffff,
+                const ExecMTask* const nextp = dynamic_cast<ExecMTask*>(edgeOutp->top());
+                // Dependent MTask should not yet be assigned to a thread
+                UASSERT(m_mtaskState[nextp].threadId == UNASSIGNED,
                         "Tasks after one being assigned should not be assigned yet");
-                // They also should not be ready yet, since they only now
-                // may become ready
-                UASSERT_OBJ(m_ready.find(nextp) == m_ready.end(), nextp,
+                // Dependent MTask should not be ready yet, since dependency is just being assigned
+                UASSERT_OBJ(readyMTasks.find(nextp) == readyMTasks.end(), nextp,
                             "Tasks after one being assigned should not be ready");
-                bool isReady = true;
-                for (V3GraphEdge* edgeInp = nextp->inBeginp(); edgeInp;
-                     edgeInp = edgeInp->inNextp()) {
-                    ExecMTask* priorp = dynamic_cast<ExecMTask*>(edgeInp->fromp());
-                    if (priorp == bestMtaskp) continue;
-                    if (priorp->thread() == 0xffffffff) {
-                        // This prior is not assigned yet
-                        isReady = false;
-                    }
-                }
-                if (isReady) {
-                    m_ready.insert(nextp);
+                if (isReady(nextp)) {
+                    readyMTasks.insert(nextp);
                     UINFO(6, "Inserted " << nextp->name() << " into ready\n");
                 }
             }
-
-            // Update the ExecMTask itself
-            if (m_prevMTask[bestTh]) {
-                m_prevMTask[bestTh]->packNextp(bestMtaskp);
-                UINFO(6, "Packing " << bestMtaskp->name() << " after "
-                                    << m_prevMTask[bestTh]->name() << endl);
-            } else {
-                UINFO(6, "Marking " << bestMtaskp->name() << " as thread root\n");
-                bestMtaskp->threadRoot(true);
-            }
-            bestMtaskp->thread(bestTh);
-
-            // Update the thread state
-            m_prevMTask[bestTh] = bestMtaskp;
-            m_busyUntil[bestTh] = bestEndTime;
         }
+
+        return schedule;
     }
 
     // SELF TEST
     static void selfTest() {
         V3Graph graph;
-        ExecMTask* t0 = new ExecMTask(&graph, nullptr, 0);
+        ExecMTask* const t0 = new ExecMTask(&graph, nullptr, 0);
         t0->cost(1000);
         t0->priority(1100);
-        ExecMTask* t1 = new ExecMTask(&graph, nullptr, 1);
+        ExecMTask* const t1 = new ExecMTask(&graph, nullptr, 1);
         t1->cost(100);
         t1->priority(100);
-        ExecMTask* t2 = new ExecMTask(&graph, nullptr, 2);
+        ExecMTask* const t2 = new ExecMTask(&graph, nullptr, 2);
         t2->cost(100);
         t2->priority(100);
 
         new V3GraphEdge(&graph, t0, t1, 1);
         new V3GraphEdge(&graph, t0, t2, 1);
 
-        PartPackMTasks packer(&graph,
-                              2,  // Threads
+        PartPackMTasks packer(2,  // Threads
                               3,  // Sandbag numerator
                               10);  // Sandbag denom
-        packer.go();
+        const ThreadSchedule& schedule = packer.pack(graph);
 
-        UASSERT_SELFTEST(bool, t0->threadRoot(), true);
-        UASSERT_SELFTEST(uint32_t, t0->thread(), 0);
-        UASSERT_SELFTEST(const void*, t0->packNextp(), t1);
+        UASSERT_SELFTEST(size_t, schedule.threads.size(), 2);
 
-        UASSERT_SELFTEST(uint32_t, t1->thread(), 0);
-        UASSERT_SELFTEST(bool, t1->threadRoot(), false);
-        UASSERT_SELFTEST(const void*, t1->packNextp(), nullptr);
+        UASSERT_SELFTEST(size_t, schedule.threads[0].size(), 2);
+        UASSERT_SELFTEST(size_t, schedule.threads[1].size(), 1);
 
-        UASSERT_SELFTEST(uint32_t, t2->thread(), 1);
-        UASSERT_SELFTEST(bool, t2->threadRoot(), true);
-        UASSERT_SELFTEST(const void*, t2->packNextp(), nullptr);
+        UASSERT_SELFTEST(const ExecMTask*, schedule.threads[0][0], t0);
+        UASSERT_SELFTEST(const ExecMTask*, schedule.threads[0][1], t1);
+        UASSERT_SELFTEST(const ExecMTask*, schedule.threads[1][0], t2);
+
+        UASSERT_SELFTEST(size_t, schedule.threadId.size(), 3);
+
+        UASSERT_SELFTEST(uint32_t, schedule.threadId.at(t0), 0);
+        UASSERT_SELFTEST(uint32_t, schedule.threadId.at(t1), 0);
+        UASSERT_SELFTEST(uint32_t, schedule.threadId.at(t2), 1);
 
         // On its native thread, we see the actual end time for t0:
         UASSERT_SELFTEST(uint32_t, packer.completionTime(t0, 0), 1000);
@@ -2478,7 +2522,7 @@ void V3Partition::go(V3Graph* mtasksp) {
     }
 }
 
-void V3Partition::finalizeCosts(V3Graph* execMTaskGraphp) {
+static void finalizeCosts(V3Graph* execMTaskGraphp) {
     GraphStreamUnordered ser(execMTaskGraphp, GraphWay::REVERSE);
 
     while (const V3GraphVertex* vxp = ser.nextp()) {
@@ -2544,9 +2588,170 @@ void V3Partition::finalizeCosts(V3Graph* execMTaskGraphp) {
     }
 }
 
+static void addMTaskToFunction(const ThreadSchedule& schedule, const uint32_t threadId,
+                               AstCFunc* funcp, const ExecMTask* mtaskp) {
+    AstNodeModule* const modp = v3Global.rootp()->topModulep();
+    FileLine* const fl = modp->fileline();
+
+    // Helper function to make the code a bit more legible
+    const auto addStrStmt = [=](const string& stmt) -> void {  //
+        funcp->addStmtsp(new AstCStmt(fl, stmt));
+    };
+
+    if (const uint32_t nDependencies = schedule.crossThreadDependencies(mtaskp)) {
+        // This mtask has dependencies executed on another thread, so it may block. Create the task
+        // state variable and wait to be notified.
+        const string name = "__Vm_mtaskstate_" + cvtToStr(mtaskp->id());
+        AstBasicDType* const mtaskStateDtypep
+            = v3Global.rootp()->typeTablep()->findBasicDType(fl, AstBasicDTypeKwd::MTASKSTATE);
+        AstVar* const varp = new AstVar(fl, AstVarType::MODULETEMP, name, mtaskStateDtypep);
+        varp->valuep(new AstConst(fl, nDependencies));
+        varp->protect(false);  // Do not protect as we still have references in AstText
+        modp->addStmtp(varp);
+        // For now, reference is still via text bashing
+        addStrStmt("vlSelf->" + name + +".waitUntilUpstreamDone(even_cycle);\n");
+    }
+
+    string recName;
+    if (v3Global.opt.profThreads()) {
+        recName = "__Vprfthr_" + cvtToStr(mtaskp->id());
+        addStrStmt("VlProfileRec* " + recName + " = nullptr;\n");
+        // Leave this if() here, as don't want to call VL_RDTSC_Q unless profiling
+        addStrStmt("if (VL_UNLIKELY(vlSelf->__Vm_profile_cycle_start)) {\n" +  //
+                   recName + " = vlSelf->__Vm_threadPoolp->profileAppend();\n" +  //
+                   recName + "->startRecord(VL_RDTSC_Q() - vlSelf->__Vm_profile_cycle_start," +  //
+                   " " + cvtToStr(mtaskp->id()) + "," +  //
+                   " " + cvtToStr(mtaskp->cost()) + ");\n" +  //
+                   "}\n");
+    }
+
+    //
+    addStrStmt("Verilated::mtaskId(" + cvtToStr(mtaskp->id()) + ");\n");
+
+    // Move the the actual body of calls to leaf functions into this function
+    funcp->addStmtsp(mtaskp->bodyp()->unlinkFrBack());
+
+    if (v3Global.opt.profThreads()) {
+        // Leave this if() here, as don't want to call VL_RDTSC_Q unless profiling
+        addStrStmt("if (VL_UNLIKELY(" + recName + ")) {\n" +  //
+                   recName + "->endRecord(VL_RDTSC_Q() - vlSelf->__Vm_profile_cycle_start);\n"
+                   + "}\n");
+    }
+
+    // Flush message queue
+    addStrStmt("Verilated::endOfThreadMTask(vlSymsp->__Vm_evalMsgQp);\n");
+
+    // For any dependent mtask that's on another thread, signal one dependency completion.
+    for (V3GraphEdge* edgep = mtaskp->outBeginp(); edgep; edgep = edgep->outNextp()) {
+        const ExecMTask* const nextp = dynamic_cast<ExecMTask*>(edgep->top());
+        if (schedule.threadId.at(nextp) != threadId) {
+            addStrStmt("vlSelf->__Vm_mtaskstate_" + cvtToStr(nextp->id())
+                       + ".signalUpstreamDone(even_cycle);\n");
+        }
+    }
+}
+
+static const std::vector<AstCFunc*> createThreadFunctions(const ThreadSchedule& schedule) {
+    AstNodeModule* const modp = v3Global.rootp()->topModulep();
+    FileLine* const fl = modp->fileline();
+
+    std::vector<AstCFunc*> funcps;
+
+    // For each thread, create a function representing its entry point
+    for (const std::vector<const ExecMTask*>& thread : schedule.threads) {
+        if (thread.empty()) continue;
+        const uint32_t threadId = schedule.threadId.at(thread.front());
+        string name = "__Vthread_";
+        name += cvtToStr(threadId);
+        AstCFunc* const funcp = new AstCFunc(fl, name, nullptr, "void");
+        modp->addStmtp(funcp);
+        funcps.push_back(funcp);
+        funcp->isStatic(true);  // Uses void self pointer, so static and hand rolled
+        funcp->isLoose(true);
+        funcp->entryPoint(true);
+        funcp->argTypes("void* voidSelf, bool even_cycle");
+
+        // Setup vlSelf an vlSyms
+        funcp->addStmtsp(new AstCStmt(fl, EmitCBaseVisitor::voidSelfAssign()));
+        funcp->addStmtsp(new AstCStmt(fl, EmitCBaseVisitor::symClassAssign()));
+
+        // Invoke each mtask scheduled to this thread from the thread function
+        for (const ExecMTask* const mtaskp : thread) {
+            addMTaskToFunction(schedule, threadId, funcp, mtaskp);
+        }
+
+        // Unblock the fake "final" mtask when this thread is finished
+        funcp->addStmtsp(
+            new AstCStmt(fl, "vlSelf->__Vm_mtaskstate_final.signalUpstreamDone(even_cycle);\n"));
+    }
+
+    // Create the fake "final" mtask state variable
+    AstBasicDType* const mtaskStateDtypep
+        = v3Global.rootp()->typeTablep()->findBasicDType(fl, AstBasicDTypeKwd::MTASKSTATE);
+    AstVar* const varp
+        = new AstVar(fl, AstVarType::MODULETEMP, "__Vm_mtaskstate_final", mtaskStateDtypep);
+    varp->valuep(new AstConst(fl, funcps.size()));
+    varp->protect(false);  // Do not protect as we still have references in AstText
+    modp->addStmtp(varp);
+
+    return funcps;
+}
+
+static void addThreadStartToExecGraph(AstExecGraph* const execGraphp,
+                                      const std::vector<AstCFunc*>& funcps) {
+    // FileLine used for constructing nodes below
+    FileLine* const fl = v3Global.rootp()->fileline();
+
+    // Add thread function invocations to execGraph
+    const auto addStrStmt = [=](const string& stmt) -> void {  //
+        execGraphp->addStmtsp(new AstCStmt(fl, stmt));
+    };
+    const auto addTextStmt = [=](const string& text) -> void {
+        execGraphp->addStmtsp(new AstText(fl, text, /* tracking: */ true));
+    };
+
+    addStrStmt("vlSelf->__Vm_even_cycle = !vlSelf->__Vm_even_cycle;\n");
+
+    const uint32_t last = funcps.size() - 1;
+    for (uint32_t i = 0; i <= last; ++i) {
+        AstCFunc* const funcp = funcps.at(i);
+        if (i != last) {
+            // The first N-1 will run on the thread pool.
+            addTextStmt("vlSelf->__Vm_threadPoolp->workerp(" + cvtToStr(i) + ")->addTask(");
+            execGraphp->addStmtsp(new AstAddrOfCFunc(fl, funcp));
+            addTextStmt(", vlSelf, vlSelf->__Vm_even_cycle);\n");
+        } else {
+            // The last will run on the main thread.
+            AstCCall* const callp = new AstCCall(fl, funcp);
+            callp->argTypes("vlSelf, vlSelf->__Vm_even_cycle");
+            execGraphp->addStmtsp(callp);
+            addStrStmt("Verilated::mtaskId(0);\n");
+        }
+    }
+
+    addStrStmt("vlSelf->__Vm_mtaskstate_final.waitUntilUpstreamDone(vlSelf->__Vm_even_cycle);\n");
+}
+
+static void implementExecGraph(AstExecGraph* const execGraphp) {
+    // Nothing to be done if there are no MTasks in the graph at all.
+    if (execGraphp->depGraphp()->empty()) return;
+
+    // Schedule the mtasks: statically associate each mtask with a thread,
+    // and determine the order in which each thread will runs its mtasks.
+    const ThreadSchedule& schedule = PartPackMTasks().pack(*execGraphp->mutableDepGraphp());
+
+    // Create a function to be run by each thread. Note this moves all AstMTaskBody nodes form the
+    // AstExecGrap into the AstCFunc created
+    const std::vector<AstCFunc*>& funcps = createThreadFunctions(schedule);
+    UASSERT(!funcps.empty(), "Non-empty ExecGraph yields no threads?");
+
+    // Start the thread functions at the point this AstExecGraph is located in the tree.
+    addThreadStartToExecGraph(execGraphp, funcps);
+}
+
 void V3Partition::finalize() {
     // Called by Verilator top stage
-    AstExecGraph* execGraphp = v3Global.rootp()->execGraphp();
+    AstExecGraph* const execGraphp = v3Global.rootp()->execGraphp();
     UASSERT(execGraphp, "Couldn't find AstExecGraph singleton.");
 
     // Back in V3Order, we partitioned mtasks using provisional cost
@@ -2556,9 +2761,8 @@ void V3Partition::finalize() {
     // ExecMTask.
     finalizeCosts(execGraphp->mutableDepGraphp());
 
-    // "Pack" the mtasks: statically associate each mtask with a thread,
-    // and determine the order in which each thread will runs its mtasks.
-    PartPackMTasks(execGraphp->mutableDepGraphp()).go();
+    // Replace the graph body with it's multi-threaded implementation.
+    implementExecGraph(execGraphp);
 }
 
 void V3Partition::selfTest() {
diff --git a/src/V3Partition.h b/src/V3Partition.h
index 12f58f830..0c9ca80d2 100644
--- a/src/V3Partition.h
+++ b/src/V3Partition.h
@@ -63,7 +63,6 @@ public:
     static void finalize();
 
 private:
-    static void finalizeCosts(V3Graph* execMTaskGraphp);
     static void setupMTaskDeps(V3Graph* mtasksp, const Vx2MTaskMap* vx2mtaskp);
 
     VL_DEBUG_FUNC;  // Declare debug()
diff --git a/src/V3PartitionGraph.h b/src/V3PartitionGraph.h
index 8bc4baf3f..24e081d90 100644
--- a/src/V3PartitionGraph.h
+++ b/src/V3PartitionGraph.h
@@ -54,17 +54,13 @@ public:
 
 class ExecMTask final : public AbstractMTask {
 private:
-    AstMTaskBody* m_bodyp;  // Task body
-    uint32_t m_id;  // Unique id of this mtask.
+    AstMTaskBody* const m_bodyp;  // Task body
+    const uint32_t m_id;  // Unique id of this mtask.
     uint32_t m_priority = 0;  // Predicted critical path from the start of
-    // this mtask to the ends of the graph that are reachable from this
-    // mtask. In abstract time units.
+                              // this mtask to the ends of the graph that are reachable from this
+                              // mtask. In abstract time units.
     uint32_t m_cost = 0;  // Predicted runtime of this mtask, in the same
-    // abstract time units as priority().
-    uint32_t m_thread = 0xffffffff;  // Thread for static (pack_mtasks) scheduling,
-    // or 0xffffffff if not yet assigned.
-    const ExecMTask* m_packNextp = nullptr;  // Next for static (pack_mtasks) scheduling
-    bool m_threadRoot = false;  // Is root thread
+                          // abstract time units as priority().
     VL_UNCOPYABLE(ExecMTask);
 
 public:
@@ -78,12 +74,6 @@ public:
     void priority(uint32_t pri) { m_priority = pri; }
     virtual uint32_t cost() const override { return m_cost; }
     void cost(uint32_t cost) { m_cost = cost; }
-    void thread(uint32_t thread) { m_thread = thread; }
-    uint32_t thread() const { return m_thread; }
-    void packNextp(const ExecMTask* nextp) { m_packNextp = nextp; }
-    const ExecMTask* packNextp() const { return m_packNextp; }
-    bool threadRoot() const { return m_threadRoot; }
-    void threadRoot(bool threadRoot) { m_threadRoot = threadRoot; }
     string cFuncName() const {
         // If this MTask maps to a C function, this should be the name
         return string("__Vmtask") + "__" + cvtToStr(m_id);
@@ -92,9 +82,6 @@ public:
     void dump(std::ostream& str) const {
         str << name() << "." << cvtToHex(this);
         if (priority() || cost()) str << " [pr=" << priority() << " c=" << cvtToStr(cost()) << "]";
-        if (thread() != 0xffffffff) str << " th=" << thread();
-        if (threadRoot()) str << " [ROOT]";
-        if (packNextp()) str << " nx=" << packNextp()->name();
     }
 };
 inline std::ostream& operator<<(std::ostream& os, const ExecMTask& rhs) {
diff --git a/src/Verilator.cpp b/src/Verilator.cpp
index 041a2705c..a73fe58bf 100644
--- a/src/Verilator.cpp
+++ b/src/Verilator.cpp
@@ -490,6 +490,14 @@ static void process() {
         V3CCtors::cctorsAll();
     }
 
+    if (!v3Global.opt.xmlOnly() && v3Global.opt.mtasks()) {
+        // Finalize our MTask cost estimates and pack the mtasks into
+        // threads. Must happen pre-EmitC which relies on the packing
+        // order. Must happen post-V3LifePost which changes the relative
+        // costs of mtasks.
+        V3Partition::finalize();
+    }
+
     // Output the text
     if (!v3Global.opt.lintOnly() && !v3Global.opt.xmlOnly() && !v3Global.opt.dpiHdrOnly()) {
         // Create AstCUse to determine what class forward declarations/#includes needed in C
@@ -504,13 +512,6 @@ static void process() {
     } else if (v3Global.opt.dpiHdrOnly()) {
         V3EmitC::emitcSyms(true);
     }
-    if (!v3Global.opt.xmlOnly() && v3Global.opt.mtasks()) {
-        // Finalize our MTask cost estimates and pack the mtasks into
-        // threads. Must happen pre-EmitC which relies on the packing
-        // order. Must happen post-V3LifePost which changes the relative
-        // costs of mtasks.
-        V3Partition::finalize();
-    }
     if (!v3Global.opt.xmlOnly()
         && !v3Global.opt.dpiHdrOnly()) {  // Unfortunately we have some lint checks in emitc.
         V3EmitC::emitc();
diff --git a/test_regress/t/t_inst_tree_inl0_pub1_norelcfuncs.pl b/test_regress/t/t_inst_tree_inl0_pub1_norelcfuncs.pl
index 27c1c82b3..3e2ae31fc 100755
--- a/test_regress/t/t_inst_tree_inl0_pub1_norelcfuncs.pl
+++ b/test_regress/t/t_inst_tree_inl0_pub1_norelcfuncs.pl
@@ -33,7 +33,7 @@ if ($Self->{vlt_all}) {
         $text =~ s/vlSelf->.* = VL_RAND_RESET.*;//g;
         $text =~ s/vlSelf->__Vm_even_cycle//g;
         $text =~ s/vlSelf->__Vm_even_cycle//g;
-        $text =~ s/vlSelf->__Vm_mt_(final|\d+)//g;
+        $text =~ s/vlSelf->__Vm_mtaskstate_(final|\d+)//g;
         $text =~ s/vlSelf->__Vm_threadPoolp//g;
         if ($text =~ m/this->/ || $text =~ m/vlSelf->/) {
             error("$file has unexpected this-> refs when --norelative-cfuncs");
diff --git a/test_regress/t/t_inst_tree_inl1_pub1.pl b/test_regress/t/t_inst_tree_inl1_pub1.pl
index 624135b06..ed87d615c 100755
--- a/test_regress/t/t_inst_tree_inl1_pub1.pl
+++ b/test_regress/t/t_inst_tree_inl1_pub1.pl
@@ -19,9 +19,9 @@ compile(
     );
 
 if ($Self->{vlt_all}) {
-    file_grep("$out_filename", qr/\<var fl="e70" loc=".*?" name="u.u0.u0.z0" dtype_id="3" vartype="logic" origName="z0" public="true" public_flat_rd="true" public_flat_rw="true"\/\>/i);
-    file_grep("$out_filename", qr/\<var fl="e85" loc=".*?" name="u.u0.u0.u0.u0.z1" dtype_id="3" vartype="logic" origName="z1" public="true" public_flat_rd="true" public_flat_rw="true"\/\>/i);
-    file_grep("$out_filename", qr/\<var fl="e83" loc=".*?" name="u.u0.u1.u0.u0.z" dtype_id="3" vartype="logic" origName="z" public="true" public_flat_rd="true" public_flat_rw="true"\/\>/i);
+    file_grep("$out_filename", qr/\<var fl="e70" loc=".*?" name="u.u0.u0.z0" dtype_id="\d+" vartype="logic" origName="z0" public="true" public_flat_rd="true" public_flat_rw="true"\/\>/i);
+    file_grep("$out_filename", qr/\<var fl="e85" loc=".*?" name="u.u0.u0.u0.u0.z1" dtype_id="\d+" vartype="logic" origName="z1" public="true" public_flat_rd="true" public_flat_rw="true"\/\>/i);
+    file_grep("$out_filename", qr/\<var fl="e83" loc=".*?" name="u.u0.u1.u0.u0.z" dtype_id="\d+" vartype="logic" origName="z" public="true" public_flat_rd="true" public_flat_rw="true"\/\>/i);
 }
 
 execute(

From 6c332a2f8eec0ea272dc457740a3256d8c6f686b Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Wed, 16 Jun 2021 13:02:46 +0100
Subject: [PATCH 25/73] Emit: Remove emitVarCmtChg

emitVarCmtChg used to emit MTask affinity of variables in comments in
the generated header. This causes unnecessary changes in the output when
scheduling changes slightly between compilation, hindering ccache reuse.
If needing this info for debugging Verilator, add a separate dump file
instead of emitting it in the generated code.
---
 src/V3AstNodes.cpp |  7 -------
 src/V3AstNodes.h   |  1 -
 src/V3EmitC.cpp    | 14 +-------------
 3 files changed, 1 insertion(+), 21 deletions(-)

diff --git a/src/V3AstNodes.cpp b/src/V3AstNodes.cpp
index 399ceb3b9..4b607309c 100644
--- a/src/V3AstNodes.cpp
+++ b/src/V3AstNodes.cpp
@@ -640,13 +640,6 @@ AstVar* AstVar::scVarRecurse(AstNode* nodep) {
     return nullptr;
 }
 
-string AstVar::mtasksString() const {
-    std::ostringstream os;
-    os << "all: ";
-    for (const auto& id : m_mtaskIds) os << id << " ";
-    return os.str();
-}
-
 class AstNodeDType::CTypeRecursed final {
 public:
     string m_type;  // The base type, e.g.: "Foo_t"s
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index 7f583f929..19dea6a9b 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -2227,7 +2227,6 @@ public:
     void addProducingMTaskId(int id) { m_mtaskIds.insert(id); }
     void addConsumingMTaskId(int id) { m_mtaskIds.insert(id); }
     const MTaskIdSet& mtaskIds() const { return m_mtaskIds; }
-    string mtasksString() const;
 };
 
 class AstDefParam final : public AstNode {
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 290608961..671eecf5c 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -124,13 +124,6 @@ public:
             puts("[" + cvtToStr(arrayp->elementsConst()) + "]");
         }
     }
-    void emitVarCmtChg(const AstVar* varp, string* curVarCmtp) {
-        string newVarCmt = varp->mtasksString();
-        if (*curVarCmtp != newVarCmt) {
-            *curVarCmtp = newVarCmt;
-            if (v3Global.opt.threads()) puts("// Begin mtask footprint " + *curVarCmtp + "\n");
-        }
-    }
     void emitTypedefs(AstNode* firstp) {
         bool first = true;
         for (AstNode* loopp = firstp; loopp; loopp = loopp->nextp()) {
@@ -3097,7 +3090,6 @@ void EmitCStmts::emitSortedVarList(const VarVec& anons, const VarVec& nonanons,
                     if (anonL1s != 1) puts("struct {\n");
                     for (int l0 = 0; l0 < lim && it != anons.cend(); ++l0) {
                         const AstVar* varp = *it;
-                        emitVarCmtChg(varp, &curVarCmt);
                         emitVarDecl(varp, prefixIfImp);
                         ++it;
                     }
@@ -3110,15 +3102,11 @@ void EmitCStmts::emitSortedVarList(const VarVec& anons, const VarVec& nonanons,
         // Leftovers, just in case off by one error somewhere above
         for (; it != anons.end(); ++it) {
             const AstVar* varp = *it;
-            emitVarCmtChg(varp, &curVarCmt);
             emitVarDecl(varp, prefixIfImp);
         }
     }
     // Output nonanons
-    for (const AstVar* varp : nonanons) {
-        emitVarCmtChg(varp, &curVarCmt);
-        emitVarDecl(varp, prefixIfImp);
-    }
+    for (const AstVar* varp : nonanons) { emitVarDecl(varp, prefixIfImp); }
 }
 
 void EmitCImp::emitThreadingState() {

From 729bd268dec01bd8cad1db70b54147f3f28d6a0b Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Wed, 16 Jun 2021 13:52:37 +0100
Subject: [PATCH 26/73] Internals: make AstCFunc::m_isStatic a bool.

All functions are now known to be static or not static when they are
created, so turn the isStatic flag into a bool (from VBoolOrUnknown).
---
 src/V3AstNodes.cpp   | 6 +-----
 src/V3AstNodes.h     | 9 ++++-----
 src/V3Depth.cpp      | 2 +-
 src/V3DepthBlock.cpp | 2 +-
 src/V3Descope.cpp    | 8 +-------
 src/V3EmitC.cpp      | 8 ++++----
 src/V3EmitCBase.h    | 4 ++--
 7 files changed, 14 insertions(+), 25 deletions(-)

diff --git a/src/V3AstNodes.cpp b/src/V3AstNodes.cpp
index 4b607309c..d631e4065 100644
--- a/src/V3AstNodes.cpp
+++ b/src/V3AstNodes.cpp
@@ -1818,11 +1818,7 @@ void AstCFunc::dump(std::ostream& str) const {
     this->AstNode::dump(str);
     if (slow()) str << " [SLOW]";
     if (pure()) str << " [PURE]";
-    if (isStatic().unknown()) {
-        str << " [STATICU]";
-    } else if (isStatic().trueUnknown()) {
-        str << " [STATIC]";
-    }
+    if (isStatic()) str << " [STATIC]";
     if (dpiExportDispatcher()) str << " [DPIED]";
     if (dpiExportImpl()) str << " [DPIEI]";
     if (dpiImportPrototype()) str << " [DPIIP]";
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index 19dea6a9b..c2b82f85c 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -8734,7 +8734,7 @@ private:
     string m_ctorInits;  // Constructor sub-class inits
     string m_ifdef;  // #ifdef symbol around this function
     VBoolOrUnknown m_isConst;  // Function is declared const (*this not changed)
-    VBoolOrUnknown m_isStatic;  // Function is declared static (no this)
+    bool m_isStatic : 1;  // Function is static (no need for a 'this' pointer)
     bool m_dontCombine : 1;  // V3Combine shouldn't compare this func tree, it's special
     bool m_declPrivate : 1;  // Declare it private
     bool m_formCallTree : 1;  // Make a global function to call entire tree of functions
@@ -8758,10 +8758,10 @@ public:
         : ASTGEN_SUPER_CFunc(fl) {
         m_funcType = AstCFuncType::FT_NORMAL;
         m_isConst = VBoolOrUnknown::BU_UNKNOWN;  // Unknown until analyzed
-        m_isStatic = VBoolOrUnknown::BU_UNKNOWN;  // Unknown until see where thisp needed
         m_scopep = scopep;
         m_name = name;
         m_rtnType = rtnType;
+        m_isStatic = false;
         m_dontCombine = false;
         m_declPrivate = false;
         m_formCallTree = false;
@@ -8801,9 +8801,8 @@ public:
     VBoolOrUnknown isConst() const { return m_isConst; }
     void isConst(bool flag) { m_isConst.setTrueOrFalse(flag); }
     void isConst(VBoolOrUnknown flag) { m_isConst = flag; }
-    VBoolOrUnknown isStatic() const { return m_isStatic; }
-    void isStatic(bool flag) { m_isStatic.setTrueOrFalse(flag); }
-    void isStatic(VBoolOrUnknown flag) { m_isStatic = flag; }
+    bool isStatic() const { return m_isStatic; }
+    void isStatic(bool flag) { m_isStatic = flag; }
     void cname(const string& name) { m_cname = name; }
     string cname() const { return m_cname; }
     AstScope* scopep() const { return m_scopep; }
diff --git a/src/V3Depth.cpp b/src/V3Depth.cpp
index 5ff517a62..789cf8359 100644
--- a/src/V3Depth.cpp
+++ b/src/V3Depth.cpp
@@ -128,7 +128,7 @@ private:
     // (Here instead of new visitor after V3Descope just to avoid another visitor)
     void needNonStaticFunc(AstNode* nodep) {
         UASSERT_OBJ(m_cfuncp, nodep, "Non-static accessor not under a function");
-        if (m_cfuncp->isStatic().trueUnknown()) {
+        if (m_cfuncp->isStatic()) {
             UINFO(5, "Mark non-public due to " << nodep << endl);
             m_cfuncp->isStatic(false);
         }
diff --git a/src/V3DepthBlock.cpp b/src/V3DepthBlock.cpp
index 5707fccd4..f94813a06 100644
--- a/src/V3DepthBlock.cpp
+++ b/src/V3DepthBlock.cpp
@@ -61,7 +61,7 @@ private:
         if (VN_IS(m_modp, Class)) {
             funcp->argTypes(EmitCBaseVisitor::symClassVar());
             callp->argTypes("vlSymsp");
-        } else if (funcp->isStatic().falseUnknown()) {
+        } else if (!funcp->isStatic()) {
             callp->selfPointer("this");
         }
         UINFO(6, "      New " << callp << endl);
diff --git a/src/V3Descope.cpp b/src/V3Descope.cpp
index 8d94ef243..44ba216d2 100644
--- a/src/V3Descope.cpp
+++ b/src/V3Descope.cpp
@@ -49,7 +49,6 @@ private:
     AstScope* m_scopep = nullptr;  // Current scope
     bool m_modSingleton = false;  // m_modp is only instanced once
     bool m_allowThis = false;  // Allow function non-static
-    bool m_needThis = false;  // Make function non-static
     FuncMmap m_modFuncs;  // Name of public functions added
 
     // METHODS
@@ -92,7 +91,6 @@ private:
         UINFO(8, "             aboveScope " << scopep->aboveScopep() << endl);
 
         if (relativeRefOk && scopep == m_scopep) {
-            m_needThis = true;
             return "this";
         } else if (VN_IS(scopep->modp(), Class)) {
             return "";
@@ -105,7 +103,6 @@ private:
             string name = scopep->name();
             string::size_type pos;
             if ((pos = name.rfind('.')) != string::npos) name.erase(0, pos + 1);
-            m_needThis = true;
             return "this->" + name;
         } else {
             // Reference to something elsewhere, or relative references are disabled. Use global
@@ -258,14 +255,11 @@ private:
         // nodep->funcp()->scopep(nullptr);
     }
     virtual void visit(AstCFunc* nodep) override {
-        VL_RESTORER(m_needThis);
         VL_RESTORER(m_allowThis);
         if (!nodep->user1()) {
-            m_needThis = false;
-            m_allowThis = nodep->isStatic().falseUnknown();  // Non-static or unknown if static
+            m_allowThis = !nodep->isStatic();
             iterateChildren(nodep);
             nodep->user1(true);
-            if (m_needThis) nodep->isStatic(false);
             // If it's under a scope, move it up to the top
             if (m_scopep) {
                 nodep->unlinkFrBack();
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 671eecf5c..9aa369517 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -247,7 +247,7 @@ public:
     }
     void ccallIterateArgs(AstNodeCCall* nodep) {
         bool comma = false;
-        if (nodep->funcp()->isLoose() && nodep->funcp()->isStatic().falseUnknown()) {
+        if (nodep->funcp()->isLoose() && !nodep->funcp()->isStatic()) {
             UASSERT_OBJ(!nodep->selfPointer().empty(), nodep,
                         "Call to loose method without self pointer");
             puts(nodep->selfPointerProtect(m_useSelfForThis));
@@ -384,7 +384,7 @@ public:
         } else if (funcp->dpiImportPrototype()) {
             // Calling DPI import
             puts(funcp->name());
-        } else if (funcp->isProperMethod() && funcp->isStatic().trueUnknown()) {
+        } else if (funcp->isProperMethod() && funcp->isStatic()) {
             // Call static method via the containing class
             AstNodeModule* modp = VN_CAST(funcp->user4p(), NodeModule);
             puts(prefixNameProtect(modp) + "::");
@@ -1588,7 +1588,7 @@ class EmitCImp final : EmitCStmts {
 
         if (nodep->isLoose()) {
             m_lazyDecls.declared(nodep);  // Defined here, so no longer needs declaration
-            if (nodep->isStatic().falseUnknown()) {  // Standard prologue
+            if (!nodep->isStatic()) {  // Standard prologue
                 m_useSelfForThis = true;
                 puts("if (false && vlSelf) {}  // Prevent unused\n");
                 if (!VN_IS(m_modp, Class)) puts(symClassAssign());
@@ -3864,7 +3864,7 @@ class EmitCTrace final : EmitCStmts {
 
             if (nodep->isLoose()) {
                 m_lazyDecls.declared(nodep);  // Defined here, so no longer needs declaration
-                if (nodep->isStatic().falseUnknown()) {  // Standard prologue
+                if (!nodep->isStatic()) {  // Standard prologue
                     puts("if (false && vlSelf) {}  // Prevent unused\n");
                     m_useSelfForThis = true;
                     puts(symClassAssign());
diff --git a/src/V3EmitCBase.h b/src/V3EmitCBase.h
index 005956543..e3d32d827 100644
--- a/src/V3EmitCBase.h
+++ b/src/V3EmitCBase.h
@@ -105,7 +105,7 @@ public:
     string cFuncArgs(const AstCFunc* nodep) {
         // Return argument list for given C function
         string args;
-        if (nodep->isLoose() && nodep->isStatic().falseUnknown()) {
+        if (nodep->isLoose() && !nodep->isStatic()) {
             if (nodep->isConst().trueKnown()) args += "const ";
             AstNodeModule* modp = VN_CAST(nodep->user4p(), NodeModule);
             args += prefixNameProtect(modp);
@@ -148,7 +148,7 @@ public:
         ensureNewLine();
         if (!funcp->ifdef().empty()) puts("#ifdef " + funcp->ifdef() + "\n");
         if (cLinkage) puts("extern \"C\" ");
-        if (funcp->isStatic().trueUnknown() && funcp->isProperMethod()) puts("static ");
+        if (funcp->isStatic() && funcp->isProperMethod()) puts("static ");
         if (funcp->isVirtual()) {
             UASSERT_OBJ(funcp->isProperMethod(), funcp, "Virtual function is not a proper method");
             puts("virtual ");

From 9eafca5e28b95970805d7c436975eb9ac467ec58 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Thu, 17 Jun 2021 04:17:43 +0100
Subject: [PATCH 27/73] Remove deprecated --no-relative-cfuncs (#3024)

---
 Changes                                       |  1 +
 bin/verilator                                 |  1 -
 docs/guide/deprecations.rst                   |  4 --
 docs/guide/exe_verilator.rst                  |  4 --
 src/V3CCtors.cpp                              |  3 +-
 src/V3Descope.cpp                             |  9 +---
 src/V3Options.cpp                             |  5 --
 src/V3Options.h                               |  2 -
 .../t/t_inst_tree_inl0_pub1_norelcfuncs.pl    | 52 -------------------
 9 files changed, 4 insertions(+), 77 deletions(-)
 delete mode 100755 test_regress/t/t_inst_tree_inl0_pub1_norelcfuncs.pl

diff --git a/Changes b/Changes
index 70f794f7e..4a9148a89 100644
--- a/Changes
+++ b/Changes
@@ -18,6 +18,7 @@ Verilator 4.205 devel
 
 **Minor:**
 
+* Remove deprecated --no-relative-cfuncs option (#3024). [Geza Lore]
 * Merge const static data globally into a new constant pool (#3013). [Geza Lore]
 * Fix error on unsupported recursive functions (#2957). [Trefor Southwell]
 
diff --git a/bin/verilator b/bin/verilator
index 0b5f4b636..752412a3c 100755
--- a/bin/verilator
+++ b/bin/verilator
@@ -379,7 +379,6 @@ detailed descriptions of these arguments.
      -pvalue+<name>=<value>     Overwrite toplevel parameter
     --quiet-exit                Don't print the command on failure
     --relative-includes         Resolve includes relative to current file
-    --no-relative-cfuncs        Disallow 'this->' in generated functions
     --reloop-limit              Minimum iterations for forming loops
     --report-unoptflat          Extra diagnostics for UNOPTFLAT
     --rr                        Run Verilator and record with rr
diff --git a/docs/guide/deprecations.rst b/docs/guide/deprecations.rst
index ddb7546db..2bc811c1a 100644
--- a/docs/guide/deprecations.rst
+++ b/docs/guide/deprecations.rst
@@ -11,10 +11,6 @@ C++11 compiler support
   require C++14 or newer compilers for both compiling Verilator and
   compiling Verilated models no sooner than January 2022.
 
-No-Relative-Cfuncs Option
-  The :vlopt:`--no-relative-cfuncs` option is not be required by any C++11
-  compliant compiler and is planned for removal no sooner than July 2021.
-
 Inhibit-Sim Option
   The :vlopt:`--inhibit-sim` option is planned for removal no sooner than
   July 2021.
diff --git a/docs/guide/exe_verilator.rst b/docs/guide/exe_verilator.rst
index 0fa6c7ab5..626a6575d 100644
--- a/docs/guide/exe_verilator.rst
+++ b/docs/guide/exe_verilator.rst
@@ -661,10 +661,6 @@ Summary:
 
    Backward compatible alias for :vlopt:`--pins-bv 33 <--pins-bv>`.
 
-.. option:: --no-relative-cfuncs
-
-   Deprecated.
-
 .. option:: --no-skip-identical =item --skip-identical
 
    Rarely needed.  Disables or enables skipping execution of Verilator if
diff --git a/src/V3CCtors.cpp b/src/V3CCtors.cpp
index ca8b6d31d..3cc1a9344 100644
--- a/src/V3CCtors.cpp
+++ b/src/V3CCtors.cpp
@@ -145,8 +145,7 @@ void V3CCtors::evalAsserts() {
                         // if (signal & CONST(upper_non_clean_mask)) { fail; }
                         AstVarRef* const vrefp
                             = new AstVarRef(varp->fileline(), varp, VAccess::READ);
-                        vrefp->selfPointer(v3Global.opt.relativeCFuncs() ? "this"
-                                                                         : "vlSymsp->TOPp");
+                        vrefp->selfPointer("this");
                         AstNode* newp = vrefp;
                         if (varp->isWide()) {
                             newp = new AstWordSel(
diff --git a/src/V3Descope.cpp b/src/V3Descope.cpp
index 44ba216d2..2cd49254d 100644
--- a/src/V3Descope.cpp
+++ b/src/V3Descope.cpp
@@ -74,15 +74,10 @@ private:
     string descopedSelfPointer(const AstScope* scopep) {
         UASSERT(scopep, "Var/Func not scoped");
 
-        // It's possible to disable relative references. This is a concession
-        // to older compilers (gcc < 4.5.x) that don't understand __restrict__
-        // well and emit extra ld/st to guard against pointer aliasing
-        // when this-> and vlSyms-> are mixed in the same function.
-        bool relativeRefOk = v3Global.opt.relativeCFuncs();
-        //
+        // Whether to use relative references via 'this->'
+        bool relativeRefOk = true;
         // Static functions can't use this
         if (!m_allowThis) relativeRefOk = false;
-        //
         // Class methods need relative
         if (m_modp && VN_IS(m_modp, Class)) relativeRefOk = true;
 
diff --git a/src/V3Options.cpp b/src/V3Options.cpp
index 8a5893a5b..dfc5ff830 100644
--- a/src/V3Options.cpp
+++ b/src/V3Options.cpp
@@ -1243,11 +1243,6 @@ void V3Options::parseOptsList(FileLine* fl, const string& optdir, int argc, char
 
     DECL_OPTION("-quiet-exit", OnOff, &m_quietExit);
 
-    DECL_OPTION("-relative-cfuncs", CbOnOff, [this, fl](bool flag) {
-        m_relativeCFuncs = flag;
-        if (!m_relativeCFuncs)
-            fl->v3warn(DEPRECATED, "Deprecated --no-relative-cfuncs, unnecessary with C++11.");
-    });
     DECL_OPTION("-relative-includes", OnOff, &m_relativeIncludes);
     DECL_OPTION("-reloop-limit", CbVal, [this, fl](const char* valp) {
         m_reloopLimit = std::atoi(valp);
diff --git a/src/V3Options.h b/src/V3Options.h
index 3f33c90d3..af6e127b8 100644
--- a/src/V3Options.h
+++ b/src/V3Options.h
@@ -260,7 +260,6 @@ private:
     bool m_public = false;          // main switch: --public
     bool m_publicFlatRW = false;    // main switch: --public-flat-rw
     bool m_quietExit = false;       // main switch: --quiet-exit
-    bool m_relativeCFuncs = true;   // main switch: --relative-cfuncs
     bool m_relativeIncludes = false; // main switch: --relative-includes
     bool m_reportUnoptflat = false; // main switch: --report-unoptflat
     bool m_savable = false;         // main switch: --savable
@@ -473,7 +472,6 @@ public:
     bool ignc() const { return m_ignc; }
     bool inhibitSim() const { return m_inhibitSim; }
     bool quietExit() const { return m_quietExit; }
-    bool relativeCFuncs() const { return m_relativeCFuncs; }
     bool reportUnoptflat() const { return m_reportUnoptflat; }
     bool verilate() const { return m_verilate; }
     bool vpi() const { return m_vpi; }
diff --git a/test_regress/t/t_inst_tree_inl0_pub1_norelcfuncs.pl b/test_regress/t/t_inst_tree_inl0_pub1_norelcfuncs.pl
deleted file mode 100755
index 3e2ae31fc..000000000
--- a/test_regress/t/t_inst_tree_inl0_pub1_norelcfuncs.pl
+++ /dev/null
@@ -1,52 +0,0 @@
-#!/usr/bin/env perl
-if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
-# DESCRIPTION: Verilator: Verilog Test driver/expect definition
-#
-# Copyright 2003 by Wilson Snyder. This program is free software; you
-# can redistribute it and/or modify it under the terms of either the GNU
-# Lesser General Public License Version 3 or the Perl Artistic License
-# Version 2.0.
-# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
-
-scenarios(simulator => 1);
-
-top_filename("t/t_inst_tree.v");
-
-compile(
-    verilator_flags2 => ['--stats', '-Wno-DEPRECATED', '--norelative-cfuncs',
-                         "$Self->{t_dir}/t_inst_tree_inl0_pub1.vlt",
-                         $Self->wno_unopthreads_for_few_cores()]
-    );
-
-if ($Self->{vlt_all}) {
-    # Fewer optimizations than t_inst_tree_inl0_pub1 which allows
-    # relative CFuncs:
-    file_grep($Self->{stats}, qr/Optimizations, Combined CFuncs\s+(\d+)/i,
-              ($Self->{vltmt} ? 0 : 31));
-
-    # Should not find any 'this->' or 'vlSelf->' except some specific cases
-    my @files = `ls $Self->{obj_dir}/*.cpp`;
-    foreach my $file (@files) {
-        chomp $file;
-        my $text = file_contents($file);
-        $text =~ s/(vlSelf|this)->vlSymsp//g;
-        $text =~ s/vlSelf->.* = VL_RAND_RESET.*;//g;
-        $text =~ s/vlSelf->__Vm_even_cycle//g;
-        $text =~ s/vlSelf->__Vm_even_cycle//g;
-        $text =~ s/vlSelf->__Vm_mtaskstate_(final|\d+)//g;
-        $text =~ s/vlSelf->__Vm_threadPoolp//g;
-        if ($text =~ m/this->/ || $text =~ m/vlSelf->/) {
-            error("$file has unexpected this-> refs when --norelative-cfuncs");
-        }
-    }
-}
-
-execute(
-    check_finished => 1,
-    expect =>
-'\] (%m|.*t\.ps): Clocked
-',
-    );
-
-ok(1);
-1;

From 0a28fc8c6322ec00a483fe2dd49114ecc96d9c0a Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Wed, 16 Jun 2021 15:57:54 +0100
Subject: [PATCH 28/73] Internals: minor cleanup to V3Descope

---
 src/V3Descope.cpp | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/src/V3Descope.cpp b/src/V3Descope.cpp
index 2cd49254d..87b7e9564 100644
--- a/src/V3Descope.cpp
+++ b/src/V3Descope.cpp
@@ -46,9 +46,9 @@ private:
 
     // STATE
     AstNodeModule* m_modp = nullptr;  // Current module
-    AstScope* m_scopep = nullptr;  // Current scope
-    bool m_modSingleton = false;  // m_modp is only instanced once
-    bool m_allowThis = false;  // Allow function non-static
+    const AstScope* m_scopep = nullptr;  // Current scope
+    const AstCFunc* m_funcp = nullptr;  // Current function
+    bool m_modSingleton = false;  // m_modp is only instantiated once
     FuncMmap m_modFuncs;  // Name of public functions added
 
     // METHODS
@@ -74,12 +74,8 @@ private:
     string descopedSelfPointer(const AstScope* scopep) {
         UASSERT(scopep, "Var/Func not scoped");
 
-        // Whether to use relative references via 'this->'
-        bool relativeRefOk = true;
-        // Static functions can't use this
-        if (!m_allowThis) relativeRefOk = false;
-        // Class methods need relative
-        if (m_modp && VN_IS(m_modp, Class)) relativeRefOk = true;
+        // Static functions can't use relative references via 'this->'
+        const bool relativeRefOk = !m_funcp->isStatic();
 
         UINFO(8, "      Descope ref under " << m_scopep << endl);
         UINFO(8, "              ref to    " << scopep << endl);
@@ -88,7 +84,7 @@ private:
         if (relativeRefOk && scopep == m_scopep) {
             return "this";
         } else if (VN_IS(scopep->modp(), Class)) {
-            return "";
+            return "this";
         } else if (!m_modSingleton && relativeRefOk && scopep->aboveScopep() == m_scopep
                    && VN_IS(scopep->modp(), Module)) {
             // Reference to scope of instance directly under this module, can just "this->cell",
@@ -250,9 +246,12 @@ private:
         // nodep->funcp()->scopep(nullptr);
     }
     virtual void visit(AstCFunc* nodep) override {
-        VL_RESTORER(m_allowThis);
+        VL_RESTORER(m_funcp);
         if (!nodep->user1()) {
-            m_allowThis = !nodep->isStatic();
+            // Static functions should have been moved under the corresponding AstClassPackage
+            UASSERT(!(nodep->isStatic() && VN_IS(m_modp, Class)),
+                    "Static function under AstClass");
+            m_funcp = nodep;
             iterateChildren(nodep);
             nodep->user1(true);
             // If it's under a scope, move it up to the top

From 5fddf51e8c77e4d73cb1f77fb268b7695761f9fd Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Thu, 17 Jun 2021 21:17:15 -0400
Subject: [PATCH 29/73] Internals: Favor VlWide over WData arrays. No
 functional change intended.

---
 include/verilated.cpp     | 34 +++++++++++++++++-----------------
 include/verilated_dpi.cpp |  4 ++--
 include/verilated_dpi.h   |  3 ++-
 include/verilated_heavy.h | 14 +++++++-------
 include/verilated_vpi.cpp |  2 +-
 5 files changed, 29 insertions(+), 28 deletions(-)

diff --git a/include/verilated.cpp b/include/verilated.cpp
index aa4bb49c3..0885d9505 100644
--- a/include/verilated.cpp
+++ b/include/verilated.cpp
@@ -484,9 +484,9 @@ WDataOutP VL_POW_WWW(int obits, int, int rbits, WDataOutP owp, WDataInP lwp,
     owp[0] = 1;
     for (int i = 1; i < VL_WORDS_I(obits); i++) owp[i] = 0;
     // cppcheck-suppress variableScope
-    WData powstore[VL_MULS_MAX_WORDS];  // Fixed size, as MSVC++ doesn't allow [words] here
-    WData lastpowstore[VL_MULS_MAX_WORDS];  // Fixed size, as MSVC++ doesn't allow [words] here
-    WData lastoutstore[VL_MULS_MAX_WORDS];  // Fixed size, as MSVC++ doesn't allow [words] here
+    VlWide<VL_MULS_MAX_WORDS> powstore;  // Fixed size, as MSVC++ doesn't allow [words] here
+    VlWide<VL_MULS_MAX_WORDS> lastpowstore;  // Fixed size, as MSVC++ doesn't allow [words] here
+    VlWide<VL_MULS_MAX_WORDS> lastoutstore;  // Fixed size, as MSVC++ doesn't allow [words] here
     // cppcheck-suppress variableScope
     VL_ASSIGN_W(obits, powstore, lwp);
     for (int bit = 0; bit < rbits; bit++) {
@@ -503,7 +503,7 @@ WDataOutP VL_POW_WWW(int obits, int, int rbits, WDataOutP owp, WDataInP lwp,
 }
 WDataOutP VL_POW_WWQ(int obits, int lbits, int rbits, WDataOutP owp, WDataInP lwp,
                      QData rhs) VL_MT_SAFE {
-    WData rhsw[VL_WQ_WORDS_E];
+    VlWide<VL_WQ_WORDS_E> rhsw;
     VL_SET_WQ(rhsw, rhs);
     return VL_POW_WWW(obits, lbits, rbits, owp, lwp, rhsw);
 }
@@ -547,7 +547,7 @@ WDataOutP VL_POWSS_WWW(int obits, int, int rbits, WDataOutP owp, WDataInP lwp, W
 }
 WDataOutP VL_POWSS_WWQ(int obits, int lbits, int rbits, WDataOutP owp, WDataInP lwp, QData rhs,
                        bool lsign, bool rsign) VL_MT_SAFE {
-    WData rhsw[VL_WQ_WORDS_E];
+    VlWide<VL_WQ_WORDS_E> rhsw;
     VL_SET_WQ(rhsw, rhs);
     return VL_POWSS_WWW(obits, lbits, rbits, owp, lwp, rhsw, lsign, rsign);
 }
@@ -602,10 +602,10 @@ double VL_ISTOR_D_W(int lbits, WDataInP lwp) VL_PURE {
 std::string VL_DECIMAL_NW(int width, WDataInP lwp) VL_MT_SAFE {
     int maxdecwidth = (width + 3) * 4 / 3;
     // Or (maxdecwidth+7)/8], but can't have more than 4 BCD bits per word
-    WData bcd[VL_VALUE_STRING_MAX_WIDTH / 4 + 2];
+    VlWide<VL_VALUE_STRING_MAX_WIDTH / 4 + 2> bcd;
     VL_ZERO_RESET_W(maxdecwidth, bcd);
-    WData tmp[VL_VALUE_STRING_MAX_WIDTH / 4 + 2];
-    WData tmp2[VL_VALUE_STRING_MAX_WIDTH / 4 + 2];
+    VlWide<VL_VALUE_STRING_MAX_WIDTH / 4 + 2> tmp;
+    VlWide<VL_VALUE_STRING_MAX_WIDTH / 4 + 2> tmp2;
     int from_bit = width - 1;
     // Skip all leading zeros
     for (; from_bit >= 0 && !(VL_BITRSHIFT_W(lwp, from_bit) & 1); --from_bit) {}
@@ -648,7 +648,7 @@ std::string _vl_vsformat_time(char* tmp, T ld, int timeunit, bool left, size_t w
     if (std::numeric_limits<T>::is_integer) {
         constexpr int b = 128;
         constexpr int w = VL_WORDS_I(b);
-        WData tmp0[w], tmp1[w], tmp2[w], tmp3[w];
+        VlWide<w> tmp0, tmp1, tmp2, tmp3;
 
         WDataInP shifted = VL_EXTEND_WQ(b, 0, tmp0, static_cast<QData>(ld));
         if (shift < 0) {
@@ -666,7 +666,7 @@ std::string _vl_vsformat_time(char* tmp, T ld, int timeunit, bool left, size_t w
             = VL_EXTEND_WQ(b, 0, tmp2, std::numeric_limits<vluint64_t>::max());  // breaks shifted
         if (VL_GT_W(w, integer, max64Bit)) {
             WDataOutP v = VL_ASSIGN_W(b, tmp3, integer);  // breaks fracDigitsPow10
-            WData zero[w], ten[w];
+            VlWide<w> zero, ten;
             VL_ZERO_W(b, zero);
             VL_EXTEND_WI(b, 0, ten, 10);
             char buf[128];  // 128B is obviously long enough to represent 128bit integer in decimal
@@ -676,7 +676,7 @@ std::string _vl_vsformat_time(char* tmp, T ld, int timeunit, bool left, size_t w
                 --ptr;
                 WDataInP mod = VL_MODDIV_WWW(b, tmp2, v, ten);  // breaks max64Bit
                 *ptr = "0123456789"[VL_SET_QW(mod)];
-                WData divided[w];
+                VlWide<w> divided;
                 VL_DIV_WWW(b, divided, v, ten);
                 VL_ASSIGN_W(b, v, divided);
             }
@@ -818,7 +818,7 @@ void _vl_vsformat(std::string& output, const char* formatp, va_list ap) VL_MT_SA
                 // Deal with all read-and-print somethings
                 const int lbits = va_arg(ap, int);
                 QData ld = 0;
-                WData qlwp[VL_WQ_WORDS_E];
+                VlWide<VL_WQ_WORDS_E> qlwp;
                 WDataInP lwp = nullptr;
                 if (lbits <= VL_QUADSIZE) {
                     ld = VL_VA_ARG_Q_(ap, lbits);
@@ -860,7 +860,7 @@ void _vl_vsformat(std::string& output, const char* formatp, va_list ap) VL_MT_SA
                         append = t_tmp;
                     } else {
                         if (VL_SIGN_E(lbits, lwp[VL_WORDS_I(lbits) - 1])) {
-                            WData neg[VL_VALUE_STRING_MAX_WIDTH / 4 + 2];
+                            VlWide<VL_VALUE_STRING_MAX_WIDTH / 4 + 2> neg;
                             VL_NEGATE_W(VL_WORDS_I(lbits), neg, lwp);
                             append = std::string("-") + VL_DECIMAL_NW(lbits, neg);
                         } else {
@@ -1119,7 +1119,7 @@ IData _vl_vsscanf(FILE* fp,  // If a fscanf
                 // Deal with all read-and-scan somethings
                 // Note LSBs are preserved if there's an overflow
                 const int obits = inIgnore ? 0 : va_arg(ap, int);
-                WData qowp[VL_WQ_WORDS_E];
+                VlWide<VL_WQ_WORDS_E> qowp;
                 VL_SET_WQ(qowp, 0ULL);
                 WDataOutP owp = qowp;
                 if (obits == -1) {  // string
@@ -1485,7 +1485,7 @@ IData VL_FSCANF_IX(IData fpi, const char* formatp, ...) VL_MT_SAFE {
 }
 
 IData VL_SSCANF_IIX(int lbits, IData ld, const char* formatp, ...) VL_MT_SAFE {
-    WData fnw[VL_WQ_WORDS_E];
+    VlWide<VL_WQ_WORDS_E> fnw;
     VL_SET_WI(fnw, ld);
 
     va_list ap;
@@ -1495,7 +1495,7 @@ IData VL_SSCANF_IIX(int lbits, IData ld, const char* formatp, ...) VL_MT_SAFE {
     return got;
 }
 IData VL_SSCANF_IQX(int lbits, QData ld, const char* formatp, ...) VL_MT_SAFE {
-    WData fnw[VL_WQ_WORDS_E];
+    VlWide<VL_WQ_WORDS_E> fnw;
     VL_SET_WQ(fnw, ld);
 
     va_list ap;
@@ -1572,7 +1572,7 @@ IData VL_FREAD_I(int width, int array_lsb, int array_size, void* memp, IData fpi
 }
 
 IData VL_SYSTEM_IQ(QData lhs) VL_MT_SAFE {
-    WData lhsw[VL_WQ_WORDS_E];
+    VlWide<VL_WQ_WORDS_E> lhsw;
     VL_SET_WQ(lhsw, lhs);
     return VL_SYSTEM_IW(VL_WQ_WORDS_E, lhsw);
 }
diff --git a/include/verilated_dpi.cpp b/include/verilated_dpi.cpp
index 47139cd1e..c40ec5c9a 100644
--- a/include/verilated_dpi.cpp
+++ b/include/verilated_dpi.cpp
@@ -279,7 +279,7 @@ static void _vl_svGetBitArrElemVecVal(svBitVecVal* d, const svOpenArrayHandle s,
     case VLVT_UINT16: d[0] = *(reinterpret_cast<SData*>(datap)); return;
     case VLVT_UINT32: d[0] = *(reinterpret_cast<IData*>(datap)); return;
     case VLVT_UINT64: {
-        WData lwp[2];
+        VlWide<2> lwp;
         VL_SET_WQ(lwp, *(reinterpret_cast<QData*>(datap)));
         d[0] = lwp[0];
         d[1] = lwp[1];
@@ -316,7 +316,7 @@ static void _vl_svGetLogicArrElemVecVal(svLogicVecVal* d, const svOpenArrayHandl
         d[0].bval = 0;
         return;
     case VLVT_UINT64: {
-        WData lwp[2];
+        VlWide<2> lwp;
         VL_SET_WQ(lwp, *(reinterpret_cast<QData*>(datap)));
         d[0].aval = lwp[0];
         d[0].bval = 0;
diff --git a/include/verilated_dpi.h b/include/verilated_dpi.h
index 8ad748e6a..8834342b9 100644
--- a/include/verilated_dpi.h
+++ b/include/verilated_dpi.h
@@ -28,6 +28,7 @@
 
 #include "verilatedos.h"
 #include "verilated.h"  // Also presumably included by caller
+#include "verilated_heavy.h"  // Also presumably included by caller
 #include "verilated_sym_props.h"
 
 #include "svdpi.h"
@@ -82,7 +83,7 @@ static inline void VL_SET_SVLV_I(int, svLogicVecVal* owp, IData ld) VL_MT_SAFE {
     owp[0].bval = 0;
 }
 static inline void VL_SET_SVLV_Q(int, svLogicVecVal* owp, QData ld) VL_MT_SAFE {
-    WData lwp[2];
+    VlWide<2> lwp;
     VL_SET_WQ(lwp, ld);
     owp[0].aval = lwp[0];
     owp[0].bval = 0;
diff --git a/include/verilated_heavy.h b/include/verilated_heavy.h
index 97b44c92b..7b9218ff1 100644
--- a/include/verilated_heavy.h
+++ b/include/verilated_heavy.h
@@ -878,14 +878,14 @@ static inline bool VL_CAST_DYNAMIC(VlClassRef<T> in, VlClassRef<U>& outr) {
 
 extern std::string VL_CVT_PACK_STR_NW(int lwords, WDataInP lwp) VL_MT_SAFE;
 inline std::string VL_CVT_PACK_STR_NQ(QData lhs) VL_PURE {
-    WData lw[VL_WQ_WORDS_E];
+    VlWide<VL_WQ_WORDS_E> lw;
     VL_SET_WQ(lw, lhs);
     return VL_CVT_PACK_STR_NW(VL_WQ_WORDS_E, lw);
 }
 inline std::string VL_CVT_PACK_STR_NN(const std::string& lhs) VL_PURE { return lhs; }
 inline std::string& VL_CVT_PACK_STR_NN(std::string& lhs) VL_PURE { return lhs; }
 inline std::string VL_CVT_PACK_STR_NI(IData lhs) VL_PURE {
-    WData lw[VL_WQ_WORDS_E];
+    VlWide<VL_WQ_WORDS_E> lw;
     VL_SET_WI(lw, lhs);
     return VL_CVT_PACK_STR_NW(1, lw);
 }
@@ -924,31 +924,31 @@ extern void VL_TIMEFORMAT_IINI(int units, int precision, const std::string& suff
                                VerilatedContext* contextp) VL_MT_SAFE;
 extern IData VL_VALUEPLUSARGS_INW(int rbits, const std::string& ld, WDataOutP rwp) VL_MT_SAFE;
 inline IData VL_VALUEPLUSARGS_INI(int rbits, const std::string& ld, CData& rdr) VL_MT_SAFE {
-    WData rwp[2];  // WData must always be at least 2
+    VlWide<2> rwp;  // WData must always be at least 2
     IData got = VL_VALUEPLUSARGS_INW(rbits, ld, rwp);
     if (got) rdr = rwp[0];
     return got;
 }
 inline IData VL_VALUEPLUSARGS_INI(int rbits, const std::string& ld, SData& rdr) VL_MT_SAFE {
-    WData rwp[2];  // WData must always be at least 2
+    VlWide<2> rwp;  // WData must always be at least 2
     IData got = VL_VALUEPLUSARGS_INW(rbits, ld, rwp);
     if (got) rdr = rwp[0];
     return got;
 }
 inline IData VL_VALUEPLUSARGS_INI(int rbits, const std::string& ld, IData& rdr) VL_MT_SAFE {
-    WData rwp[2];
+    VlWide<2> rwp;
     IData got = VL_VALUEPLUSARGS_INW(rbits, ld, rwp);
     if (got) rdr = rwp[0];
     return got;
 }
 inline IData VL_VALUEPLUSARGS_INQ(int rbits, const std::string& ld, QData& rdr) VL_MT_SAFE {
-    WData rwp[2];
+    VlWide<2> rwp;
     IData got = VL_VALUEPLUSARGS_INW(rbits, ld, rwp);
     if (got) rdr = VL_SET_QW(rwp);
     return got;
 }
 inline IData VL_VALUEPLUSARGS_INQ(int rbits, const std::string& ld, double& rdr) VL_MT_SAFE {
-    WData rwp[2];
+    VlWide<2> rwp;
     IData got = VL_VALUEPLUSARGS_INW(rbits, ld, rwp);
     if (got) rdr = VL_CVT_D_Q(VL_SET_QW(rwp));
     return got;
diff --git a/include/verilated_vpi.cpp b/include/verilated_vpi.cpp
index c3346429e..d0f1178b5 100644
--- a/include/verilated_vpi.cpp
+++ b/include/verilated_vpi.cpp
@@ -2154,7 +2154,7 @@ void vpi_get_time(vpiHandle object, p_vpi_time time_p) {
     }
     if (time_p->type == vpiSimTime) {
         QData qtime = VL_TIME_Q();
-        WData itime[2];
+        VlWide<2> itime;
         VL_SET_WQ(itime, qtime);
         time_p->low = itime[0];
         time_p->high = itime[1];

From d5bdd07c01188f053f1d20127aab0bcb485da636 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Fri, 18 Jun 2021 13:14:38 +0100
Subject: [PATCH 30/73] Fix out of bounds index into VlWide under AstSel

When part selecting bits via an AstSel in a VlWide, V3Expand used to do
something akin to:

word_index = lsb / 32;
bit_index = lsb % 32;
result =
  wide[word_index + 1] << (32 - bit_index) | wide[word_index] >> bit_index;

The unconditional "+ 1" can cause an out of bounds access into the
VlWide, when the whole of the select is into the most significant word
(i.e.: when word_index is already the most significant word).  We now
emit roughly this instead:

lo_word_index = lsb / 32;
bit_index = lsb % 32;
hi_word_index = (lsb + width - 1) / 32;
result =
  wide[hi_word_index] << (32 - bit_index) | wide[lo_word_index] >> bit_index;

i.e.: we explicitly calculate which word the MSB of the select falls
into, and address that word, rather than the unconditional + 1. The
shifts ensure we still yield the right result, even if lo_word_index and
hi_word_index are the same.

Note: The actual expression created by V3Expand can be a bit more
complicated as we might need to access 3 words when the result is a
QData, all 3 word indices are calculated explicitly.
---
 src/V3Expand.cpp | 82 ++++++++++++++++++++++++++----------------------
 1 file changed, 44 insertions(+), 38 deletions(-)

diff --git a/src/V3Expand.cpp b/src/V3Expand.cpp
index dd5a5ec42..2f33136f7 100644
--- a/src/V3Expand.cpp
+++ b/src/V3Expand.cpp
@@ -344,6 +344,7 @@ private:
             // See under ASSIGN(WIDE)
         } else if (nodep->fromp()->isWide()) {
             UINFO(8, "    SEL(wide) " << nodep << endl);
+            UASSERT_OBJ(nodep->widthConst() <= 64, nodep, "Inconsistent width");
             // Selection amounts
             // Check for constant shifts & save some constification work later.
             // Grab lowest bit(s)
@@ -358,60 +359,65 @@ private:
             AstNode* midp = nullptr;
             V3Number zero(nodep, longOrQuadWidth(nodep));
             if (nodep->widthConst() > 1) {
-                AstNode* midwordp =  // SEL(from,[1+wordnum])
+                const uint32_t midMsbOffset
+                    = std::min<uint32_t>(nodep->widthConst(), VL_EDATASIZE) - 1;
+                AstNode* const midMsbp
+                    = new AstAdd(nodep->lsbp()->fileline(),
+                                 new AstConst(nodep->lsbp()->fileline(), midMsbOffset),
+                                 nodep->lsbp()->cloneTree(false));
+                AstNode* midwordp =  // SEL(from,[midwordnum])
                     newWordSel(nodep->fromp()->fileline(), nodep->fromp()->cloneTree(true),
-                               nodep->lsbp(), 1);
+                               midMsbp, 0);
+                // newWordSel clones the index, so delete it
+                VL_DO_DANGLING(midMsbp->deleteTree(), midMsbp);
                 if (nodep->isQuad() && !midwordp->isQuad()) {
                     midwordp = new AstCCast(nodep->fileline(), midwordp, nodep);
                 }
-                // If we're selecting bit zero, then all 32 bits in word 1
-                // get shifted << by 32 bits
-                // else we need to form the lower word, so we << by 31 or less
-                // nbitsfromlow <= (lsb==0) ? 64-bitbit(lsb) : 32-bitbit(lsb)
-                AstNode* midshiftp
+                AstNode* const midshiftp
                     = new AstSub(nodep->lsbp()->fileline(),
                                  new AstConst(nodep->lsbp()->fileline(), VL_EDATASIZE),
                                  newSelBitBit(nodep->lsbp()));
-                if (nodep->isQuad()) {
-                    midshiftp = new AstCond(
-                        nodep->fileline(),
-                        new AstEq(nodep->fileline(), new AstConst(nodep->fileline(), 0),
-                                  newSelBitBit(nodep->lsbp())),
-                        new AstConst(nodep->lsbp()->fileline(), VL_EDATASIZE), midshiftp);
-                }
-                AstNode* midmayp
-                    = new AstShiftL(nodep->fileline(), midwordp, midshiftp, nodep->width());
-                if (nodep->isQuad()) {
-                    midp = midmayp;  // Always grab from two words
-                } else {
-                    midp = new AstCond(nodep->fileline(),
-                                       new AstEq(nodep->fileline(),
-                                                 new AstConst(nodep->fileline(), 0),
-                                                 newSelBitBit(nodep->lsbp())),
-                                       new AstConst(nodep->fileline(), zero), midmayp);
-                }
+                // If we're selecting bit zero, then all 32 bits in the mid word
+                // get shifted << by 32 bits, so ignore them.
+                midp = new AstCond(
+                    nodep->fileline(),
+                    // lsb % VL_EDATASIZE == 0 ?
+
+                    new AstEq(nodep->fileline(), new AstConst(nodep->fileline(), 0),
+                              newSelBitBit(nodep->lsbp())),
+                    // 0 :
+                    new AstConst(nodep->fileline(), zero),
+                    //  midword >> (VL_EDATASIZE - (lbs % VL_EDATASIZE))
+                    new AstShiftL(nodep->fileline(), midwordp, midshiftp, nodep->width()));
             }
             // If > 32 bits, we might be crossing the second word boundary
             AstNode* hip = nullptr;
             if (nodep->widthConst() > VL_EDATASIZE) {
-                AstNode* hiwordp =  // SEL(from,[2+wordnum])
-                    newWordSel(nodep->fromp()->fileline(), nodep->fromp()->cloneTree(true),
-                               nodep->lsbp(), 2);
+                const uint32_t hiMsbOffset = nodep->widthConst() - 1;
+                AstNode* const hiMsbp
+                    = new AstAdd(nodep->lsbp()->fileline(),
+                                 new AstConst(nodep->lsbp()->fileline(), hiMsbOffset),
+                                 nodep->lsbp()->cloneTree(false));
+                AstNode* hiwordp =  // SEL(from,[hiwordnum])
+                    newWordSel(nodep->fromp()->fileline(), nodep->fromp()->cloneTree(true), hiMsbp,
+                               0);
+                // newWordSel clones the index, so delete it
+                VL_DO_DANGLING(hiMsbp->deleteTree(), hiMsbp);
                 if (nodep->isQuad() && !hiwordp->isQuad()) {
                     hiwordp = new AstCCast(nodep->fileline(), hiwordp, nodep);
                 }
-                AstNode* himayp
-                    = new AstShiftL(nodep->fileline(), hiwordp,
-                                    // nbitsfromlow_and_mid <= 64-bitbit(lsb)
-                                    new AstSub(nodep->lsbp()->fileline(),
-                                               new AstConst(nodep->lsbp()->fileline(), 64),
-                                               newSelBitBit(nodep->lsbp())),
-                                    nodep->width());
-                // if (frombit==0) then ignore, else use it
-                hip = new AstCond(nodep->fileline(),
+                AstNode* const hishiftp
+                    = new AstCond(nodep->fileline(),
+                                  // lsb % VL_EDATASIZE == 0 ?
                                   new AstEq(nodep->fileline(), new AstConst(nodep->fileline(), 0),
                                             newSelBitBit(nodep->lsbp())),
-                                  new AstConst(nodep->fileline(), zero), himayp);
+                                  // VL_EDATASIZE :
+                                  new AstConst(nodep->lsbp()->fileline(), VL_EDATASIZE),
+                                  // 64 - (lbs % VL_EDATASIZE)
+                                  new AstSub(nodep->lsbp()->fileline(),
+                                             new AstConst(nodep->lsbp()->fileline(), 64),
+                                             newSelBitBit(nodep->lsbp())));
+                hip = new AstShiftL(nodep->fileline(), hiwordp, hishiftp, nodep->width());
             }
 
             AstNode* newp = lowp;

From 3ec1e9eb072472e516b0d4235df3e1a392812c08 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Wed, 16 Jun 2021 17:44:06 +0100
Subject: [PATCH 31/73] Localize variables from other modules when possible

V3Localize can now localize variable references that reference variables
located in scopes different from the referencing function. This also
means V3Descope has now moved after V3Localize.
---
 src/V3Ast.h          |   3 -
 src/V3AstNodes.h     |   1 -
 src/V3DepthBlock.cpp |  17 ++--
 src/V3Descope.cpp    |  11 +--
 src/V3Localize.cpp   | 193 ++++++++++++++++++++-----------------------
 src/Verilator.cpp    |  11 ++-
 6 files changed, 112 insertions(+), 124 deletions(-)

diff --git a/src/V3Ast.h b/src/V3Ast.h
index c72e62b3a..1fd3940d3 100644
--- a/src/V3Ast.h
+++ b/src/V3Ast.h
@@ -2280,7 +2280,6 @@ private:
     string m_name;  // Name of variable
     string m_selfPointer;  // Output code object pointer (e.g.: 'this')
     string m_classPrefix;  // Output class prefix (i.e.: the part before ::)
-    bool m_hierThis = false;  // m_selfPointer points to "this" function
 
 protected:
     AstNodeVarRef(AstType t, FileLine* fl, const string& name, const VAccess& access)
@@ -2312,8 +2311,6 @@ public:
     void varp(AstVar* varp);
     AstVarScope* varScopep() const { return m_varScopep; }
     void varScopep(AstVarScope* varscp) { m_varScopep = varscp; }
-    bool hierThis() const { return m_hierThis; }
-    void hierThis(bool flag) { m_hierThis = flag; }
     string selfPointer() const { return m_selfPointer; }
     void selfPointer(const string& value) { m_selfPointer = value; }
     string selfPointerProtect(bool useSelfForThis) const;
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index c2b82f85c..94ef71ce3 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -2150,7 +2150,6 @@ public:
     }
     bool isClassMember() const { return varType() == AstVarType::MEMBER; }
     bool isStatementTemp() const { return (varType() == AstVarType::STMTTEMP); }
-    bool isMovableToBlock() const { return (varType() == AstVarType::BLOCKTEMP || isFuncLocal()); }
     bool isXTemp() const { return (varType() == AstVarType::XTEMP); }
     bool isParam() const {
         return (varType() == AstVarType::LPARAM || varType() == AstVarType::GPARAM);
diff --git a/src/V3DepthBlock.cpp b/src/V3DepthBlock.cpp
index f94813a06..54a131a75 100644
--- a/src/V3DepthBlock.cpp
+++ b/src/V3DepthBlock.cpp
@@ -48,25 +48,24 @@ private:
     AstCFunc* createDeepFunc(AstNode* nodep) {
         AstNRelinker relinkHandle;
         nodep->unlinkFrBack(&relinkHandle);
-        // Create function
-        string name = m_cfuncp->name() + "__deep" + cvtToStr(++m_deepNum);
-        AstCFunc* funcp = new AstCFunc(nodep->fileline(), name, nullptr);
+        // Create sub function
+        AstScope* const scopep = m_cfuncp->scopep();
+        const string name = m_cfuncp->name() + "__deep" + cvtToStr(++m_deepNum);
+        AstCFunc* const funcp = new AstCFunc(nodep->fileline(), name, scopep);
         funcp->slow(m_cfuncp->slow());
         funcp->isStatic(m_cfuncp->isStatic());
         funcp->isLoose(m_cfuncp->isLoose());
         funcp->addStmtsp(nodep);
-        m_modp->addStmtp(funcp);
-        // Call it at the point where the body was removed from
-        AstCCall* callp = new AstCCall(nodep->fileline(), funcp);
+        scopep->addActivep(funcp);
+        // Call sub function at the point where the body was removed from
+        AstCCall* const callp = new AstCCall(nodep->fileline(), funcp);
         if (VN_IS(m_modp, Class)) {
             funcp->argTypes(EmitCBaseVisitor::symClassVar());
             callp->argTypes("vlSymsp");
-        } else if (!funcp->isStatic()) {
-            callp->selfPointer("this");
         }
         UINFO(6, "      New " << callp << endl);
-        //
         relinkHandle.relink(callp);
+        // Done
         return funcp;
     }
 
diff --git a/src/V3Descope.cpp b/src/V3Descope.cpp
index 87b7e9564..2428d61a4 100644
--- a/src/V3Descope.cpp
+++ b/src/V3Descope.cpp
@@ -219,15 +219,17 @@ private:
     }
     virtual void visit(AstNodeVarRef* nodep) override {
         iterateChildren(nodep);
+        if (!nodep->varScopep()) {
+            UASSERT_OBJ(nodep->varp()->isFuncLocal(), nodep,
+                        "unscoped reference can only appear to function locals at this point");
+            return;
+        }
         // Convert the hierch name
         UINFO(9, "  ref-in " << nodep << endl);
         UASSERT_OBJ(m_scopep, nodep, "Node not under scope");
         const AstVar* const varp = nodep->varScopep()->varp();
         const AstScope* const scopep = nodep->varScopep()->scopep();
-        if (varp->isFuncLocal()) {
-            nodep->hierThis(true);
-        } else {
-            nodep->hierThis(scopep == m_scopep);
+        if (!varp->isFuncLocal()) {
             nodep->selfPointer(descopedSelfPointer(scopep));
             nodep->classPrefix(descopedClassPrefix(scopep));
         }
@@ -282,7 +284,6 @@ public:
 
 void V3Descope::descopeAll(AstNetlist* nodep) {
     UINFO(2, __FUNCTION__ << ": " << endl);
-    v3Global.assertScoped(false);
     { DescopeVisitor visitor(nodep); }  // Destruct before checking
     V3Global::dumpCheckGlobalTree("descope", 0, v3Global.opt.dumpTreeLevel(__FILE__) >= 3);
 }
diff --git a/src/V3Localize.cpp b/src/V3Localize.cpp
index 12e10f41a..9ee00a9f7 100644
--- a/src/V3Localize.cpp
+++ b/src/V3Localize.cpp
@@ -15,9 +15,9 @@
 //*************************************************************************
 // LOCALIZE TRANSFORMATIONS:
 //      All modules:
-//          VAR(BLOCKTEMP...
+//          VARSCOPE(BLOCKTEMP...
 //             if only referenced in a CFUNC, make it local to that CFUNC
-//          VAR(others
+//          VARSCOPE(others
 //             if non-public, set before used, and in single CFUNC, make it local
 //
 //*************************************************************************
@@ -33,18 +33,17 @@
 #include <vector>
 
 //######################################################################
-// Localize base class
+// LocalizeVisitor
 
-class LocalizeBaseVisitor VL_NOT_FINAL : public AstNVisitor {
-protected:
+class LocalizeVisitor final : public AstNVisitor {
+private:
     // NODE STATE
-    // Cleared on entire tree
-    //  AstVar::user1p()        -> CFunc which references the variable
+    //  AstVar::user1p()        -> First AstCFunc which references the variable
     //  AstVar::user2()         -> VarFlags.  Flag state
-    //  AstVar::user4()         -> AstVarRef*.  First place signal set; must be first assignment
-
-    // METHODS
-    VL_DEBUG_FUNC;  // Declare debug()
+    //  AstVar::user4p()        -> AstVarRef that writes whole variable, if first write ref.
+    AstUser1InUse m_inuser1;
+    AstUser2InUse m_inuser2;
+    AstUser4InUse m_inuser4;
 
     // TYPES
     union VarFlags {
@@ -54,99 +53,89 @@ protected:
             int m_notOpt : 1;  // NOT optimizable
             int m_notStd : 1;  // NOT optimizable if a non-blocktemp signal
             int m_stdFuncAsn : 1;  // Found simple assignment
-            int m_done : 1;  // Removed
         };
         // cppcheck-suppress unusedStructMember
         uint32_t m_flags;
-        explicit VarFlags(AstNode* nodep) { m_flags = nodep->user2(); }
-        void setNodeFlags(AstNode* nodep) { nodep->user2(m_flags); }
+        explicit VarFlags(AstVarScope* nodep) { m_flags = nodep->user2(); }
+        void setNodeFlags(AstVarScope* nodep) { nodep->user2(m_flags); }
     };
-};
-
-//######################################################################
-// Localize class functions
-
-class LocalizeDehierVisitor final : public LocalizeBaseVisitor {
-private:
-    // NODE STATE/TYPES
-    // See above
-
-    // METHODS
-    virtual void visit(AstVarRef* nodep) override {
-        // cppcheck-suppress unreadVariable  // cppcheck 1.90 bug
-        VarFlags flags(nodep->varp());
-        if (flags.m_done) {
-            nodep->selfPointer("");  // Remove 'this'
-            nodep->hierThis(true);
-        }
-    }
-    virtual void visit(AstNode* nodep) override { iterateChildren(nodep); }
-
-public:
-    // CONSTRUCTORS
-    explicit LocalizeDehierVisitor(AstNetlist* nodep) { iterate(nodep); }
-    virtual ~LocalizeDehierVisitor() override = default;
-};
-
-//######################################################################
-// Localize class functions
-
-class LocalizeVisitor final : public LocalizeBaseVisitor {
-private:
-    // NODE STATE/TYPES
-    // See above
-    AstUser1InUse m_inuser1;
-    AstUser2InUse m_inuser2;
-    AstUser4InUse m_inuser4;
 
     // STATE
     VDouble0 m_statLocVars;  // Statistic tracking
     AstCFunc* m_cfuncp = nullptr;  // Current active function
-    std::vector<AstVar*> m_varps;  // List of variables to consider for deletion
+    std::vector<AstVarScope*> m_varScopeps;  // List of variables to consider for localization
+    std::unordered_multimap<const AstVarScope*, AstVarRef*>
+        m_references;  // VarRefs referencing the given VarScope
 
     // METHODS
-    void clearOptimizable(AstVar* nodep, const char* reason) {
+    VL_DEBUG_FUNC;  // Declare debug()
+
+    void clearOptimizable(AstVarScope* nodep, const char* reason) {
         UINFO(4, "       NoOpt " << reason << " " << nodep << endl);
         VarFlags flags(nodep);
         flags.m_notOpt = true;
         flags.setNodeFlags(nodep);
     }
-    void clearStdOptimizable(AstVar* nodep, const char* reason) {
+    void clearStdOptimizable(AstVarScope* nodep, const char* reason) {
         UINFO(4, "       NoStd " << reason << " " << nodep << endl);
         VarFlags flags(nodep);
         flags.m_notStd = true;
         flags.setNodeFlags(nodep);
     }
-    void moveVars() {
-        for (AstVar* nodep : m_varps) {
-            if (nodep->valuep()) clearOptimizable(nodep, "HasInitValue");
+    void moveVarScopes() {
+        for (AstVarScope* const nodep : m_varScopeps) {
+            if (nodep->varp()->valuep()) clearOptimizable(nodep, "HasInitValue");
             if (!VarFlags(nodep).m_stdFuncAsn) clearStdOptimizable(nodep, "NoStdAssign");
             VarFlags flags(nodep);
 
-            if ((nodep->isMovableToBlock()  // Blocktemp
-                 || !flags.m_notStd)  // Or used only in block
+            if ((nodep->varp()->varType() == AstVarType::BLOCKTEMP
+                 || !flags.m_notStd)  // Temporary Or used only in block
                 && !flags.m_notOpt  // Optimizable
-                && !nodep->isClassMember() && nodep->user1p()) {  // Single cfunc
-                // We don't need to test for tracing; it would be in the tracefunc if it was needed
-                UINFO(4, "  ModVar->BlkVar " << nodep << endl);
+                && !nodep->varp()->isClassMember() &&  // Statically exists in design hierarchy
+                nodep->user1p())  // Is under a CFunc
+            {
+                UINFO(4, "Localizing " << nodep << endl);
                 ++m_statLocVars;
-                AstCFunc* newfuncp = VN_CAST(nodep->user1p(), CFunc);
-                nodep->unlinkFrBack();
-                newfuncp->addInitsp(nodep);
-                // Done
-                flags.m_done = true;
-                flags.setNodeFlags(nodep);
+                AstCFunc* const funcp = VN_CAST(nodep->user1p(), CFunc);
+                // Yank the Var and VarScope from it's parent and schedule them for deletion
+                AstVar* const varp = nodep->varp();
+                if (varp->backp()) {  // Might have already unlinked this via another AstVarScope
+                    pushDeletep(varp->unlinkFrBack());
+                }
+                pushDeletep(nodep->unlinkFrBack());
+
+                // Create the new local variable.
+                const string newName
+                    = nodep->scopep() == funcp->scopep()
+                          ? varp->name()
+                          : nodep->scopep()->nameDotless() + "__DOT__" + varp->name();
+
+                AstVar* const newVarp
+                    = new AstVar(varp->fileline(), varp->varType(), newName, varp);
+                newVarp->funcLocal(true);
+
+                // Fix up all the references
+                const auto er = m_references.equal_range(nodep);
+                for (auto it = er.first; it != er.second; ++it) {
+                    AstVarRef* const refp = it->second;
+                    refp->varScopep(nullptr);
+                    refp->varp(newVarp);
+                }
+
+                // Add the var to this function, and mark local
+                funcp->addInitsp(newVarp);
             } else {
                 clearOptimizable(nodep, "NotDone");
             }
         }
-        m_varps.clear();
+        m_varScopeps.clear();
+        m_references.clear();
     }
 
     // VISITORS
     virtual void visit(AstNetlist* nodep) override {
-        iterateChildren(nodep);
-        moveVars();
+        iterateChildrenConst(nodep);
+        moveVarScopes();
     }
     virtual void visit(AstCFunc* nodep) override {
         UINFO(4, "  CFUNC " << nodep << endl);
@@ -157,7 +146,7 @@ private:
             searchFuncStmts(nodep->initsp());
             searchFuncStmts(nodep->stmtsp());
             searchFuncStmts(nodep->finalsp());
-            iterateChildren(nodep);
+            iterateChildrenConst(nodep);
         }
     }
     void searchFuncStmts(AstNode* nodep) {
@@ -166,60 +155,64 @@ private:
         // This could be more complicated; allow always-set under both branches of a IF.
         // If so, check for ArrayRef's and such, as they aren't acceptable.
         for (; nodep; nodep = nodep->nextp()) {
-            if (VN_IS(nodep, NodeAssign)) {
-                if (AstVarRef* varrefp = VN_CAST(VN_CAST(nodep, NodeAssign)->lhsp(), VarRef)) {
+            if (AstNodeAssign* const assignp = VN_CAST(nodep, NodeAssign)) {
+                if (AstVarRef* const varrefp = VN_CAST(assignp->lhsp(), VarRef)) {
                     UASSERT_OBJ(varrefp->access().isWriteOrRW(), varrefp,
-                                "LHS assignment not lvalue");
-                    if (!varrefp->varp()->user4p()) {
+                                "LHS of assignment is not an lvalue");
+                    AstVarScope* const varScopep = varrefp->varScopep();
+                    if (!varScopep->user4p()) {
                         UINFO(4, "      FuncAsn " << varrefp << endl);
-                        varrefp->varp()->user4p(varrefp);
-                        VarFlags flags(varrefp->varp());
+                        varScopep->user4p(varrefp);
+                        VarFlags flags(varScopep);
                         flags.m_stdFuncAsn = true;
-                        flags.setNodeFlags(varrefp->varp());
+                        flags.setNodeFlags(varScopep);
                     }
                 }
             }
         }
     }
 
-    virtual void visit(AstVar* nodep) override {
-        if (!nodep->isSigPublic() && !nodep->isPrimaryIO()
-            && !m_cfuncp) {  // Not already inside a function
+    virtual void visit(AstVarScope* nodep) override {
+        if (!nodep->varp()->isPrimaryIO()  // Not an IO the user wants to interact with
+            && !nodep->varp()->isSigPublic()  // Not something the user wants to interact with
+            && !nodep->varp()->isFuncLocal()  // Not already a function local (e.g.: argument)
+            && !nodep->varp()->isStatic()  // Not a static variable
+        ) {
             UINFO(4, "    BLKVAR " << nodep << endl);
-            m_varps.push_back(nodep);
+            m_varScopeps.push_back(nodep);
         }
         // No iterate; Don't want varrefs under it
     }
     virtual void visit(AstVarRef* nodep) override {
-        if (!VarFlags(nodep->varp()).m_notOpt) {
+        AstVarScope* const varScopep = nodep->varScopep();
+        if (!VarFlags(varScopep).m_notOpt) {
+            // Remember the reference
+            m_references.emplace(varScopep, nodep);
             if (!m_cfuncp) {  // Not in function, can't optimize
                 // Perhaps impossible, but better safe
-                clearOptimizable(nodep->varp(), "BVnofunc");  // LCOV_EXCL_LINE
+                clearOptimizable(varScopep, "BVnofunc");  // LCOV_EXCL_LINE
             } else {
-                // If we're scoping down to it, it isn't really in the same block
-                if (!nodep->hierThis()) clearOptimizable(nodep->varp(), "HierRef");
                 // Allow a variable to appear in only a single function
-                AstNode* oldfunc = nodep->varp()->user1p();
+                AstNode* const oldfunc = varScopep->user1p();
                 if (!oldfunc) {
+                    // First encounter with this variable
                     UINFO(4, "      BVnewref " << nodep << endl);
-                    nodep->varp()->user1p(m_cfuncp);  // Remember where it was used
-                } else if (m_cfuncp == oldfunc) {
-                    // Same usage
-                } else {
+                    varScopep->user1p(m_cfuncp);  // Remember where it was used
+                } else if (m_cfuncp != oldfunc) {
                     // Used in multiple functions
-                    clearOptimizable(nodep->varp(), "BVmultiF");
+                    clearOptimizable(varScopep, "BVmultiF");
                 }
                 // First varref in function must be assignment found earlier
-                AstVarRef* firstasn = static_cast<AstVarRef*>(nodep->varp()->user4p());
+                const AstVarRef* const firstasn = VN_CAST(varScopep->user4p(), VarRef);
                 if (firstasn && nodep != firstasn) {
-                    clearStdOptimizable(nodep->varp(), "notFirstAsn");
-                    nodep->varp()->user4p(nullptr);
+                    clearStdOptimizable(varScopep, "notFirstAsn");
+                    varScopep->user4p(nullptr);
                 }
             }
         }
         // No iterate; Don't want varrefs under it
     }
-    virtual void visit(AstNode* nodep) override { iterateChildren(nodep); }
+    virtual void visit(AstNode* nodep) override { iterateChildrenConst(nodep); }
 
 public:
     // CONSTRUCTORS
@@ -234,10 +227,6 @@ public:
 
 void V3Localize::localizeAll(AstNetlist* nodep) {
     UINFO(2, __FUNCTION__ << ": " << endl);
-    {
-        LocalizeVisitor visitor(nodep);
-        // Fix up hiernames
-        LocalizeDehierVisitor dvisitor(nodep);
-    }  // Destruct before checking
+    { LocalizeVisitor visitor(nodep); }  // Destruct before checking
     V3Global::dumpCheckGlobalTree("localize", 0, v3Global.opt.dumpTreeLevel(__FILE__) >= 6);
 }
diff --git a/src/Verilator.cpp b/src/Verilator.cpp
index a73fe58bf..187c01586 100644
--- a/src/Verilator.cpp
+++ b/src/Verilator.cpp
@@ -403,9 +403,6 @@ static void process() {
         if (v3Global.opt.trace()) V3Trace::traceAll(v3Global.rootp());
 
         if (v3Global.opt.stats()) V3Stats::statsStageAll(v3Global.rootp(), "Scoped");
-
-        // Remove scopes; make varrefs/funccalls relative to current module
-        V3Descope::descopeAll(v3Global.rootp());
     }
 
     //--MODULE OPTIMIZATIONS--------------
@@ -416,9 +413,15 @@ static void process() {
             V3DepthBlock::depthBlockAll(v3Global.rootp());
         }
 
-        // Move BLOCKTEMPS from class to local variables
+        // Up until this point, all references must be scoped
+        v3Global.assertScoped(false);
+
+        // Move variables from modules to function local variables where possible
         if (v3Global.opt.oLocalize()) V3Localize::localizeAll(v3Global.rootp());
 
+        // Remove remaining scopes; make varrefs/funccalls relative to current module
+        V3Descope::descopeAll(v3Global.rootp());
+
         // Icache packing; combine common code in each module's functions into subroutines
         if (v3Global.opt.oCombine()) V3Combine::combineAll(v3Global.rootp());
     }

From d6237e55b2480dfeb1c30a88bef2f87fcb1302a1 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Thu, 17 Jun 2021 17:27:45 +0100
Subject: [PATCH 32/73] Internals: Add AstUserNAllocator utility classes.

These utility classes can be used to hang advanced data structures off
AstNode user*u() pointers, and they take care of memory management for
the client. Use via the call operator().
---
 src/V3Ast.h              |  13 +++--
 src/V3AstUserAllocator.h | 119 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 128 insertions(+), 4 deletions(-)
 create mode 100644 src/V3AstUserAllocator.h

diff --git a/src/V3Ast.h b/src/V3Ast.h
index 1fd3940d3..c525af73d 100644
--- a/src/V3Ast.h
+++ b/src/V3Ast.h
@@ -26,6 +26,7 @@
 #include "V3Global.h"
 
 #include <cmath>
+#include <type_traits>
 #include <unordered_set>
 
 #include "V3Ast__gen_classes.h"  // From ./astgen
@@ -1141,10 +1142,14 @@ public:
     explicit VNUser(void* p) { m_u.up = p; }
     ~VNUser() = default;
     // Casters
-    WidthVP* c() const { return reinterpret_cast<WidthVP*>(m_u.up); }
-    VSymEnt* toSymEnt() const { return reinterpret_cast<VSymEnt*>(m_u.up); }
-    AstNode* toNodep() const { return reinterpret_cast<AstNode*>(m_u.up); }
-    V3GraphVertex* toGraphVertex() const { return reinterpret_cast<V3GraphVertex*>(m_u.up); }
+    template <class T>  //
+    typename std::enable_if<std::is_pointer<T>::value, T>::type to() const {
+        return reinterpret_cast<T>(m_u.up);
+    }
+    WidthVP* c() const { return to<WidthVP*>(); }
+    VSymEnt* toSymEnt() const { return to<VSymEnt*>(); }
+    AstNode* toNodep() const { return to<AstNode*>(); }
+    V3GraphVertex* toGraphVertex() const { return to<V3GraphVertex*>(); }
     int toInt() const { return m_u.ui; }
     static VNUser fromInt(int i) { return VNUser(i); }
 };
diff --git a/src/V3AstUserAllocator.h b/src/V3AstUserAllocator.h
new file mode 100644
index 000000000..7ffb70f7b
--- /dev/null
+++ b/src/V3AstUserAllocator.h
@@ -0,0 +1,119 @@
+// -*- mode: C++; c-file-style: "cc-mode" -*-
+//*************************************************************************
+// DESCRIPTION: Verilator: Utility to hang advanced data structures of
+// AstNode::user*p() pointers with automatic memory management.
+//
+// Code available from: https://verilator.org
+//
+//*************************************************************************
+//
+// Copyright 2003-2021 by Wilson Snyder. This program is free software; you
+// can redistribute it and/or modify it under the terms of either the GNU
+// Lesser General Public License Version 3 or the Perl Artistic License
+// Version 2.0.
+// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+//
+//*************************************************************************
+
+#ifndef VERILATOR_V3ASTUSERALLOCATOR_H_
+#define VERILATOR_V3ASTUSERALLOCATOR_H_
+
+#include "config_build.h"
+#include "verilatedos.h"
+
+#include "V3Ast.h"
+
+#include <type_traits>
+#include <vector>
+
+template <class T_Node, class T_Data, int T_UserN> class AstUserAllocatorBase VL_NOT_FINAL {
+    static_assert(1 <= T_UserN && T_UserN <= 5, "Wrong user pointer number");
+    static_assert(std::is_base_of<AstNode, T_Node>::value, "T_Node must be an AstNode type");
+
+private:
+    std::vector<T_Data*> m_allocated;
+
+    inline T_Data* getUserp(T_Node* nodep) const {
+        // This simplifies statically as T_UserN is constant. In C++17, use 'if constexpr'.
+        if (T_UserN == 1) {
+            VNUser user = nodep->user1u();
+            return user.to<T_Data*>();
+        } else if (T_UserN == 2) {
+            VNUser user = nodep->user2u();
+            return user.to<T_Data*>();
+        } else if (T_UserN == 3) {
+            VNUser user = nodep->user3u();
+            return user.to<T_Data*>();
+        } else if (T_UserN == 4) {
+            VNUser user = nodep->user4u();
+            return user.to<T_Data*>();
+        } else {
+            VNUser user = nodep->user5u();
+            return user.to<T_Data*>();
+        }
+    }
+
+    inline void setUserp(T_Node* nodep, T_Data* userp) const {
+        // This simplifies statically as T_UserN is constant. In C++17, use 'if constexpr'.
+        if (T_UserN == 1) {
+            nodep->user1u(VNUser(userp));
+        } else if (T_UserN == 2) {
+            nodep->user2u(VNUser(userp));
+        } else if (T_UserN == 3) {
+            nodep->user3u(VNUser(userp));
+        } else if (T_UserN == 4) {
+            nodep->user4u(VNUser(userp));
+        } else {
+            nodep->user5u(VNUser(userp));
+        }
+    }
+
+protected:
+    AstUserAllocatorBase() {
+        // This simplifies statically as T_UserN is constant. In C++17, use 'if constexpr'.
+        if (T_UserN == 1) {
+            AstUser1InUse::check();
+        } else if (T_UserN == 2) {
+            AstUser2InUse::check();
+        } else if (T_UserN == 3) {
+            AstUser3InUse::check();
+        } else if (T_UserN == 4) {
+            AstUser4InUse::check();
+        } else {
+            AstUser5InUse::check();
+        }
+    }
+
+    virtual ~AstUserAllocatorBase() {
+        // Delete all allocated data structures
+        for (T_Data* const p : m_allocated) { delete p; }
+    }
+
+public:
+    // Get a reference to the user data
+    T_Data& operator()(T_Node* nodep) {
+        T_Data* userp = getUserp(nodep);
+        if (!userp) {
+            userp = new T_Data;
+            m_allocated.push_back(userp);
+            setUserp(nodep, userp);
+        }
+        return *userp;
+    }
+};
+
+// User pointer allocator classes. T_Node is the type of node the allocator should be applied to
+// and is simply there for a bit of extra type safety. T_Data is the type of the data structure
+// managed by the allocator.
+template <class T_Node, class T_Data>
+class AstUser1Allocator final : public AstUserAllocatorBase<T_Node, T_Data, 1> {};
+template <class T_Node, class T_Data>
+class AstUser2Allocator final : public AstUserAllocatorBase<T_Node, T_Data, 2> {};
+template <class T_Node, class T_Data>
+class AstUser3Allocator final : public AstUserAllocatorBase<T_Node, T_Data, 3> {};
+template <class T_Node, class T_Data>
+class AstUser4Allocator final : public AstUserAllocatorBase<T_Node, T_Data, 4> {};
+template <class T_Node, class T_Data>
+class AstUser5Allocator final : public AstUserAllocatorBase<T_Node, T_Data, 5> {};
+
+#endif  // Guard

From e5e5bc0fa3fe44a136b57d1d5aea53bca5a4cdf1 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Thu, 17 Jun 2021 18:49:45 +0100
Subject: [PATCH 33/73] Localize variables used in multiple functions

Teach V3Localize how to localize variables that are used in multiple
functions, if in all functions where they are used, they are always
written in whole before being consumed. This allows a lot more variables
to be localized (+20k variables on OpenTitan - when building without
--trace), and can cause significant performance improvement (OpenTitan
simulates 8.5% - build single threaded and withuot --trace).
---
 Changes            |   1 +
 src/V3Ast.h        |   1 +
 src/V3Clock.cpp    |  36 +++++++-
 src/V3Localize.cpp | 200 ++++++++++++++++++++-------------------------
 4 files changed, 121 insertions(+), 117 deletions(-)

diff --git a/Changes b/Changes
index 4a9148a89..a626dd4cc 100644
--- a/Changes
+++ b/Changes
@@ -18,6 +18,7 @@ Verilator 4.205 devel
 
 **Minor:**
 
+* Optimize a lot more model variables into function locals (#3027). [Geza Lore]
 * Remove deprecated --no-relative-cfuncs option (#3024). [Geza Lore]
 * Merge const static data globally into a new constant pool (#3013). [Geza Lore]
 * Fix error on unsupported recursive functions (#2957). [Trefor Southwell]
diff --git a/src/V3Ast.h b/src/V3Ast.h
index c525af73d..defd1d5a6 100644
--- a/src/V3Ast.h
+++ b/src/V3Ast.h
@@ -156,6 +156,7 @@ public:
         return (m_e == READWRITE) ? VAccess(m_e) : (m_e == WRITE ? VAccess(READ) : VAccess(WRITE));
     }
     bool isReadOnly() const { return m_e == READ; }  // False with READWRITE
+    bool isWriteOnly() const { return m_e == WRITE; }  // False with READWRITE
     bool isReadOrRW() const { return m_e == READ || m_e == READWRITE; }
     bool isWriteOrRW() const { return m_e == WRITE || m_e == READWRITE; }
     bool isRW() const { return m_e == READWRITE; }
diff --git a/src/V3Clock.cpp b/src/V3Clock.cpp
index 84a1c3b7d..a02d4dcd1 100644
--- a/src/V3Clock.cpp
+++ b/src/V3Clock.cpp
@@ -37,6 +37,34 @@
 
 #include <algorithm>
 
+//######################################################################
+// Convert every WRITE AstVarRef to a READ ref
+
+class ConvertWriteRefsToRead final : public AstNVisitor {
+private:
+    // MEMBERS
+    AstNode* m_result = nullptr;
+
+    // CONSTRUCTORS
+    explicit ConvertWriteRefsToRead(AstNode* nodep) {
+        m_result = iterateSubtreeReturnEdits(nodep);
+    }
+
+    // VISITORS
+    void visit(AstVarRef* nodep) override {
+        UASSERT_OBJ(!nodep->access().isRW(), nodep, "Cannot handle a READWRITE reference");
+        if (nodep->access().isWriteOnly()) {
+            nodep->replaceWith(
+                new AstVarRef(nodep->fileline(), nodep->varScopep(), VAccess::READ));
+        }
+    }
+
+    void visit(AstNode* nodep) override { iterateChildren(nodep); }
+
+public:
+    static AstNode* main(AstNode* nodep) { return ConvertWriteRefsToRead(nodep).m_result; }
+};
+
 //######################################################################
 // Clock state, as a visitor of each AstNode
 
@@ -272,14 +300,14 @@ private:
         //   IF(ORIG ^ CHANGE) { INC; CHANGE = ORIG; }
         AstNode* incp = nodep->incp()->unlinkFrBack();
         AstNode* origp = nodep->origp()->unlinkFrBack();
-        AstNode* changep = nodep->changep()->unlinkFrBack();
-        AstIf* newp = new AstIf(nodep->fileline(), new AstXor(nodep->fileline(), origp, changep),
+        AstNode* changeWrp = nodep->changep()->unlinkFrBack();
+        AstNode* changeRdp = ConvertWriteRefsToRead::main(changeWrp->cloneTree(false));
+        AstIf* newp = new AstIf(nodep->fileline(), new AstXor(nodep->fileline(), origp, changeRdp),
                                 incp, nullptr);
         // We could add another IF to detect posedges, and only increment if so.
         // It's another whole branch though versus a potential memory miss.
         // We'll go with the miss.
-        newp->addIfsp(
-            new AstAssign(nodep->fileline(), changep->cloneTree(false), origp->cloneTree(false)));
+        newp->addIfsp(new AstAssign(nodep->fileline(), changeWrp, origp->cloneTree(false)));
         nodep->replaceWith(newp);
         VL_DO_DANGLING(nodep->deleteTree(), nodep);
     }
diff --git a/src/V3Localize.cpp b/src/V3Localize.cpp
index 9ee00a9f7..0563c9866 100644
--- a/src/V3Localize.cpp
+++ b/src/V3Localize.cpp
@@ -16,9 +16,9 @@
 // LOCALIZE TRANSFORMATIONS:
 //      All modules:
 //          VARSCOPE(BLOCKTEMP...
-//             if only referenced in a CFUNC, make it local to that CFUNC
-//          VARSCOPE(others
-//             if non-public, set before used, and in single CFUNC, make it local
+//             if only referenced in one CFUNC, make it local
+//          VARSCOPE
+//             if non-public, always written before used, make it local
 //
 //*************************************************************************
 
@@ -29,6 +29,7 @@
 #include "V3Localize.h"
 #include "V3Stats.h"
 #include "V3Ast.h"
+#include "V3AstUserAllocator.h"
 
 #include <vector>
 
@@ -38,98 +39,73 @@
 class LocalizeVisitor final : public AstNVisitor {
 private:
     // NODE STATE
-    //  AstVar::user1p()        -> First AstCFunc which references the variable
-    //  AstVar::user2()         -> VarFlags.  Flag state
-    //  AstVar::user4p()        -> AstVarRef that writes whole variable, if first write ref.
+    //  AstVarScope::user1()    ->  Bool indicating VarScope is not optimizable.
+    //  AstVarScope::user2()    ->  Bool indicating VarScope was fully assigned in the current
+    //                              function.
+    //  AstVarScope::user3p()   ->  Set of CFuncs referencing this VarScope. (via m_accessors)
+    //  AstCFunc::user4p()      ->  Multimap of 'VarScope -> VarRefs that reference that VarScope'
+    //                              in this function. (via m_references)
     AstUser1InUse m_inuser1;
     AstUser2InUse m_inuser2;
+    AstUser3InUse m_inuser3;
     AstUser4InUse m_inuser4;
 
-    // TYPES
-    union VarFlags {
-        // Per-variable flags
-        // Used in user()'s so initializes to all zeros
-        struct {
-            int m_notOpt : 1;  // NOT optimizable
-            int m_notStd : 1;  // NOT optimizable if a non-blocktemp signal
-            int m_stdFuncAsn : 1;  // Found simple assignment
-        };
-        // cppcheck-suppress unusedStructMember
-        uint32_t m_flags;
-        explicit VarFlags(AstVarScope* nodep) { m_flags = nodep->user2(); }
-        void setNodeFlags(AstVarScope* nodep) { nodep->user2(m_flags); }
-    };
+    AstUser3Allocator<AstVarScope, std::unordered_set<AstCFunc*>> m_accessors;
+    AstUser4Allocator<AstCFunc, std::unordered_multimap<const AstVarScope*, AstVarRef*>>
+        m_references;
 
     // STATE
     VDouble0 m_statLocVars;  // Statistic tracking
     AstCFunc* m_cfuncp = nullptr;  // Current active function
+    uint32_t m_nodeDepth = 0;  // Node depth under m_cfuncp
     std::vector<AstVarScope*> m_varScopeps;  // List of variables to consider for localization
-    std::unordered_multimap<const AstVarScope*, AstVarRef*>
-        m_references;  // VarRefs referencing the given VarScope
 
     // METHODS
     VL_DEBUG_FUNC;  // Declare debug()
 
-    void clearOptimizable(AstVarScope* nodep, const char* reason) {
-        UINFO(4, "       NoOpt " << reason << " " << nodep << endl);
-        VarFlags flags(nodep);
-        flags.m_notOpt = true;
-        flags.setNodeFlags(nodep);
-    }
-    void clearStdOptimizable(AstVarScope* nodep, const char* reason) {
-        UINFO(4, "       NoStd " << reason << " " << nodep << endl);
-        VarFlags flags(nodep);
-        flags.m_notStd = true;
-        flags.setNodeFlags(nodep);
+    bool isOptimizable(AstVarScope* nodep) {
+        return !nodep->user1() ||  // Not marked as not optimizable, or ...
+               (nodep->varp()->varType() == AstVarType::BLOCKTEMP
+                && m_accessors(nodep).size() == 1);  // .. a block temp used in a single CFunc
     }
+
     void moveVarScopes() {
         for (AstVarScope* const nodep : m_varScopeps) {
-            if (nodep->varp()->valuep()) clearOptimizable(nodep, "HasInitValue");
-            if (!VarFlags(nodep).m_stdFuncAsn) clearStdOptimizable(nodep, "NoStdAssign");
-            VarFlags flags(nodep);
+            if (!isOptimizable(nodep)) continue;  // Not optimizable
 
-            if ((nodep->varp()->varType() == AstVarType::BLOCKTEMP
-                 || !flags.m_notStd)  // Temporary Or used only in block
-                && !flags.m_notOpt  // Optimizable
-                && !nodep->varp()->isClassMember() &&  // Statically exists in design hierarchy
-                nodep->user1p())  // Is under a CFunc
-            {
-                UINFO(4, "Localizing " << nodep << endl);
-                ++m_statLocVars;
-                AstCFunc* const funcp = VN_CAST(nodep->user1p(), CFunc);
-                // Yank the Var and VarScope from it's parent and schedule them for deletion
-                AstVar* const varp = nodep->varp();
-                if (varp->backp()) {  // Might have already unlinked this via another AstVarScope
-                    pushDeletep(varp->unlinkFrBack());
-                }
-                pushDeletep(nodep->unlinkFrBack());
+            const std::unordered_set<AstCFunc*>& funcps = m_accessors(nodep);
+            if (funcps.empty()) continue;  // No referencing functions at all
 
+            UINFO(4, "Localizing " << nodep << endl);
+            ++m_statLocVars;
+
+            // Yank the VarScope from it's parent and schedule them for deletion. Leave the Var
+            // for now, as not all VarScopes referencing this Var might be localized.
+            pushDeletep(nodep->unlinkFrBack());
+
+            // In each referencing function, create a replacement local variable
+            AstVar* const oldVarp = nodep->varp();
+            for (AstCFunc* const funcp : funcps) {
                 // Create the new local variable.
                 const string newName
                     = nodep->scopep() == funcp->scopep()
-                          ? varp->name()
-                          : nodep->scopep()->nameDotless() + "__DOT__" + varp->name();
-
+                          ? oldVarp->name()
+                          : nodep->scopep()->nameDotless() + "__DOT__" + oldVarp->name();
                 AstVar* const newVarp
-                    = new AstVar(varp->fileline(), varp->varType(), newName, varp);
+                    = new AstVar(oldVarp->fileline(), oldVarp->varType(), newName, oldVarp);
                 newVarp->funcLocal(true);
+                funcp->addInitsp(newVarp);
 
-                // Fix up all the references
-                const auto er = m_references.equal_range(nodep);
+                // Fix up all the references within this function
+                const auto er = m_references(funcp).equal_range(nodep);
                 for (auto it = er.first; it != er.second; ++it) {
                     AstVarRef* const refp = it->second;
                     refp->varScopep(nullptr);
                     refp->varp(newVarp);
                 }
-
-                // Add the var to this function, and mark local
-                funcp->addInitsp(newVarp);
-            } else {
-                clearOptimizable(nodep, "NotDone");
             }
         }
         m_varScopeps.clear();
-        m_references.clear();
     }
 
     // VISITORS
@@ -137,39 +113,35 @@ private:
         iterateChildrenConst(nodep);
         moveVarScopes();
     }
+
     virtual void visit(AstCFunc* nodep) override {
         UINFO(4, "  CFUNC " << nodep << endl);
         VL_RESTORER(m_cfuncp);
+        VL_RESTORER(m_nodeDepth);
         {
             m_cfuncp = nodep;
-            searchFuncStmts(nodep->argsp());
-            searchFuncStmts(nodep->initsp());
-            searchFuncStmts(nodep->stmtsp());
-            searchFuncStmts(nodep->finalsp());
+            m_nodeDepth = 0;
+            AstNode::user2ClearTree();  // Check each function independently
             iterateChildrenConst(nodep);
         }
     }
-    void searchFuncStmts(AstNode* nodep) {
-        // Search for basic assignments to allow moving non-blocktemps
-        // For now we only find simple assignments not under any other statement.
-        // This could be more complicated; allow always-set under both branches of a IF.
-        // If so, check for ArrayRef's and such, as they aren't acceptable.
-        for (; nodep; nodep = nodep->nextp()) {
-            if (AstNodeAssign* const assignp = VN_CAST(nodep, NodeAssign)) {
-                if (AstVarRef* const varrefp = VN_CAST(assignp->lhsp(), VarRef)) {
-                    UASSERT_OBJ(varrefp->access().isWriteOrRW(), varrefp,
-                                "LHS of assignment is not an lvalue");
-                    AstVarScope* const varScopep = varrefp->varScopep();
-                    if (!varScopep->user4p()) {
-                        UINFO(4, "      FuncAsn " << varrefp << endl);
-                        varScopep->user4p(varrefp);
-                        VarFlags flags(varScopep);
-                        flags.m_stdFuncAsn = true;
-                        flags.setNodeFlags(varScopep);
-                    }
-                }
+
+    virtual void visit(AstNodeAssign* nodep) override {
+        // Analyze RHS first so "a = a + 1" is detected as a read before write
+        iterate(nodep->rhsp());
+        // For now we only consider an assignment that is directly under the function, (in
+        // particular: not under an AstIf, or other kind of branch). This could be improved with
+        // proper data flow analysis.
+        if (m_nodeDepth == 0) {
+            // Check if simple "VARREF = ..." assignment, i.e.: this assignment sets the whole
+            // variable (and in particular, it is not assigned only in part).
+            if (AstVarRef* const refp = VN_CAST(nodep->lhsp(), VarRef)) {
+                // Mark this VarScope as assigned in this function
+                refp->varScopep()->user2(1);
             }
         }
+        // Analyze LHS (in case it's not the above simple case
+        iterate(nodep->lhsp());
     }
 
     virtual void visit(AstVarScope* nodep) override {
@@ -177,42 +149,44 @@ private:
             && !nodep->varp()->isSigPublic()  // Not something the user wants to interact with
             && !nodep->varp()->isFuncLocal()  // Not already a function local (e.g.: argument)
             && !nodep->varp()->isStatic()  // Not a static variable
+            && !nodep->varp()->isClassMember()  // Statically exists in design hierarchy
+            && !nodep->varp()->valuep()  // Does not have an initializer
         ) {
-            UINFO(4, "    BLKVAR " << nodep << endl);
+            UINFO(4, "Consider for localization: " << nodep << endl);
             m_varScopeps.push_back(nodep);
         }
-        // No iterate; Don't want varrefs under it
+        // No iterate; Don't want varrefs under it (e.g.: in child dtype?)
     }
+
     virtual void visit(AstVarRef* nodep) override {
+        UASSERT_OBJ(m_cfuncp, nodep, "AstVarRef not under function");
+
         AstVarScope* const varScopep = nodep->varScopep();
-        if (!VarFlags(varScopep).m_notOpt) {
-            // Remember the reference
-            m_references.emplace(varScopep, nodep);
-            if (!m_cfuncp) {  // Not in function, can't optimize
-                // Perhaps impossible, but better safe
-                clearOptimizable(varScopep, "BVnofunc");  // LCOV_EXCL_LINE
-            } else {
-                // Allow a variable to appear in only a single function
-                AstNode* const oldfunc = varScopep->user1p();
-                if (!oldfunc) {
-                    // First encounter with this variable
-                    UINFO(4, "      BVnewref " << nodep << endl);
-                    varScopep->user1p(m_cfuncp);  // Remember where it was used
-                } else if (m_cfuncp != oldfunc) {
-                    // Used in multiple functions
-                    clearOptimizable(varScopep, "BVmultiF");
-                }
-                // First varref in function must be assignment found earlier
-                const AstVarRef* const firstasn = VN_CAST(varScopep->user4p(), VarRef);
-                if (firstasn && nodep != firstasn) {
-                    clearStdOptimizable(varScopep, "notFirstAsn");
-                    varScopep->user4p(nullptr);
-                }
+        // Remember this function accesses this VarScope (we always need this as we might optimize
+        // this VarScope into a local, even if it's not assigned. See 'isOptimizable')
+        m_accessors(varScopep).emplace(m_cfuncp);
+        // Remember the reference so we can fix it up later (we always need this as well)
+        m_references(m_cfuncp).emplace(varScopep, nodep);
+
+        // Check if already marked as not optimizable
+        if (!varScopep->user1()) {
+            // Note: we only check read variables, as it's ok to localize (and in fact discard)
+            // any variables that are only written but never read.
+            if (nodep->access().isReadOrRW() && !varScopep->user2()) {
+                // Variable is read, but is not known to have been assigned in this function. Mark
+                // as not optimizable.
+                UINFO(4, "Not optimizable (not written): " << nodep << endl);
+                varScopep->user1(1);
             }
         }
-        // No iterate; Don't want varrefs under it
+        // No iterate; Don't want varrefs under it  (e.g.: in child dtype?)
+    }
+
+    virtual void visit(AstNode* nodep) override {
+        ++m_nodeDepth;
+        iterateChildrenConst(nodep);
+        --m_nodeDepth;
     }
-    virtual void visit(AstNode* nodep) override { iterateChildrenConst(nodep); }
 
 public:
     // CONSTRUCTORS

From 0c93c3844f69c5dd01d522e6dde13756c4b716da Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Fri, 18 Jun 2021 16:18:30 +0100
Subject: [PATCH 34/73] Simplify AND(CONST,OR(_,_)) with redundant terms

V3Expand generates a lot of OR nodes that are under a clearing mask, and
have redundant terms, e.g.: 0xff & (a << 8 | b >> 24). The 'a << 8' term
in there is redundant as it's bottom bits are all zero where the mask is
non-zero. V3Const now removes these redundant terms.
---
 src/V3Const.cpp | 49 ++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 46 insertions(+), 3 deletions(-)

diff --git a/src/V3Const.cpp b/src/V3Const.cpp
index 7c78cb314..9a8796602 100644
--- a/src/V3Const.cpp
+++ b/src/V3Const.cpp
@@ -710,6 +710,48 @@ private:
         VL_DO_DANGLING(nodep->deleteTree(), nodep);
         return true;
     }
+    bool matchMaskedOr(AstAnd* nodep) {
+        // Masking an OR with terms that have no bits set under the mask is replaced with masking
+        // only the remaining terms. Canonical example as generated by V3Expand is:
+        // 0xff & (a << 8 | b >> 24) --> 0xff & (b >> 24)
+
+        // Compute how many significant bits are in the mask
+        const AstConst* const constp = VN_CAST(nodep->lhsp(), Const);
+        const uint32_t significantBits = constp->num().widthMin();
+
+        AstOr* const orp = VN_CAST(nodep->rhsp(), Or);
+
+        // Predicate for checking whether the bottom 'significantBits' bits of the given expression
+        // are all zeroes.
+        const auto checkBottomClear = [=](const AstNode* nodep) -> bool {
+            if (const AstShiftL* const shiftp = VN_CAST_CONST(nodep, ShiftL)) {
+                if (const AstConst* const scp = VN_CAST_CONST(shiftp->rhsp(), Const)) {
+                    return scp->num().toUInt() >= significantBits;
+                }
+            }
+            return false;
+        };
+
+        const bool orLIsRedundant = checkBottomClear(orp->lhsp());
+        const bool orRIsRedundant = checkBottomClear(orp->rhsp());
+
+        if (orLIsRedundant && orRIsRedundant) {
+            nodep->replaceWith(
+                new AstConst(nodep->fileline(), AstConst::DtypedValue(), nodep->dtypep(), 0));
+            VL_DO_DANGLING(nodep->deleteTree(), nodep);
+            return true;
+        } else if (orLIsRedundant) {
+            orp->replaceWith(orp->rhsp()->unlinkFrBack());
+            VL_DO_DANGLING(orp->deleteTree(), orp);
+            return false;  // input node is still valid, keep going
+        } else if (orRIsRedundant) {
+            orp->replaceWith(orp->lhsp()->unlinkFrBack());
+            VL_DO_DANGLING(orp->deleteTree(), orp);
+            return false;  // input node is still valid, keep going
+        } else {
+            return false;
+        }
+    }
     bool matchBitOpTree(AstNode* nodep) {
         if (!v3Global.opt.oConstBitOpTree()) return false;
 
@@ -2964,9 +3006,10 @@ private:
     TREEOPV("AstConcat{$lhsp.castSel, $rhsp.castSel, ifAdjacentSel(VN_CAST($lhsp,,Sel),,VN_CAST($rhsp,,Sel))}",  "replaceConcatSel(nodep)");
     TREEOPV("AstConcat{ifConcatMergeableBiop($lhsp), concatMergeable($lhsp,,$rhsp)}", "replaceConcatMerge(nodep)");
     // Common two-level operations that can be simplified
-    TREEOP ("AstAnd {$lhsp.castConst,matchAndCond(nodep)}",           "DONE");
-    TREEOP ("AstAnd {$lhsp.castOr, $rhsp.castOr, operandAndOrSame(nodep)}",     "replaceAndOr(nodep)");
-    TREEOP ("AstOr  {$lhsp.castAnd,$rhsp.castAnd,operandAndOrSame(nodep)}",     "replaceAndOr(nodep)");
+    TREEOP ("AstAnd {$lhsp.castConst,matchAndCond(nodep)}", "DONE");
+    TREEOP ("AstAnd {$lhsp.castConst, $rhsp.castOr, matchMaskedOr(nodep)}", "DONE");
+    TREEOP ("AstAnd {$lhsp.castOr, $rhsp.castOr, operandAndOrSame(nodep)}", "replaceAndOr(nodep)");
+    TREEOP ("AstOr  {$lhsp.castAnd,$rhsp.castAnd,operandAndOrSame(nodep)}", "replaceAndOr(nodep)");
     TREEOP ("AstOr  {matchOrAndNot(nodep)}",            "DONE");
     TREEOP ("AstAnd {operandShiftSame(nodep)}",         "replaceShiftSame(nodep)");
     TREEOP ("AstOr  {operandShiftSame(nodep)}",         "replaceShiftSame(nodep)");

From 6c9c16c31df4cd3ffa034dec2906a71358fe4074 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Fri, 18 Jun 2021 18:52:02 +0100
Subject: [PATCH 35/73] Simplify redundant masking of AstShiftR/AstShiftL

AND(CONST,SHIFTR(_,C)) appears often after V3Expand, with C a large
enough dense mask (i.e.: of the form  (1 << n) - 1) to make the masking
redundant. E.g.: 0xff & ((uint32_t)a >> 24). V3Const now replaces these
ANDs with the SHIFTR node.

Similarly, we also simplify the same with SHIFTL,
e.g.: 0xff000000 & ((uint32_t)a << 24)
---
 src/V3Const.cpp | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/src/V3Const.cpp b/src/V3Const.cpp
index 9a8796602..af4b14b3a 100644
--- a/src/V3Const.cpp
+++ b/src/V3Const.cpp
@@ -752,6 +752,43 @@ private:
             return false;
         }
     }
+    bool matchMaskedShift(AstAnd* nodep) {
+        // Drop redundant masking of right shift result. E.g: 0xff & ((uint32_t)a >> 24). This
+        // commonly appears after V3Expand and the simplification in matchMaskedOr. Similarly,
+        // drop redundant masking of left shift result. E.g.: 0xff000000 & ((uint32_t)a << 24).
+
+        if (nodep->width() != nodep->rhsp()->width()) return false;  // Paranoia
+
+        const auto checkMask = [=](const V3Number& mask) -> bool {
+            const AstConst* const constp = VN_CAST(nodep->lhsp(), Const);
+            if (constp->num().isCaseEq(mask)) {
+                nodep->replaceWith(nodep->rhsp()->unlinkFrBack());
+                VL_DO_DANGLING(nodep->deleteTree(), nodep);
+                return true;
+            }
+            return false;
+        };
+
+        // Check if masking is redundant
+        if (AstShiftR* const shiftp = VN_CAST(nodep->rhsp(), ShiftR)) {
+            if (const AstConst* scp = VN_CAST_CONST(shiftp->rhsp(), Const)) {
+                // Check if mask is full over the non-zero bits
+                V3Number maskLo(nodep, nodep->width());
+                maskLo.setMask(nodep->width() - scp->num().toUInt());
+                return checkMask(maskLo);
+            }
+        } else if (AstShiftL* const shiftp = VN_CAST(nodep->rhsp(), ShiftL)) {
+            if (const AstConst* scp = VN_CAST_CONST(shiftp->rhsp(), Const)) {
+                // Check if mask is full over the non-zero bits
+                V3Number maskLo(nodep, nodep->width()), maskHi(nodep, nodep->width());
+                maskLo.setMask(nodep->width() - scp->num().toUInt());
+                maskHi.opShiftL(maskLo, scp->num());
+                return checkMask(maskHi);
+            }
+        }
+        return false;
+    }
+
     bool matchBitOpTree(AstNode* nodep) {
         if (!v3Global.opt.oConstBitOpTree()) return false;
 
@@ -3008,6 +3045,7 @@ private:
     // Common two-level operations that can be simplified
     TREEOP ("AstAnd {$lhsp.castConst,matchAndCond(nodep)}", "DONE");
     TREEOP ("AstAnd {$lhsp.castConst, $rhsp.castOr, matchMaskedOr(nodep)}", "DONE");
+    TREEOP ("AstAnd {$lhsp.castConst, matchMaskedShift(nodep)}", "DONE");
     TREEOP ("AstAnd {$lhsp.castOr, $rhsp.castOr, operandAndOrSame(nodep)}", "replaceAndOr(nodep)");
     TREEOP ("AstOr  {$lhsp.castAnd,$rhsp.castAnd,operandAndOrSame(nodep)}", "replaceAndOr(nodep)");
     TREEOP ("AstOr  {matchOrAndNot(nodep)}",            "DONE");

From 52cde49a6f7b0fbc7bc86c00a2bd58a8317a5efd Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Fri, 18 Jun 2021 22:19:35 -0400
Subject: [PATCH 36/73] Internals: Add more const. No functional change.

---
 include/verilated.cpp         | 211 +++++++--------
 include/verilated.h           | 480 +++++++++++++++++-----------------
 include/verilated_cov.cpp     |   8 +-
 include/verilated_dpi.cpp     | 108 ++++----
 include/verilated_dpi.h       |  20 +-
 include/verilated_fst_c.cpp   |   4 +-
 include/verilated_fst_sc.h    |   4 +-
 include/verilated_heavy.h     |   9 +-
 include/verilated_save.cpp    |  28 +-
 include/verilated_save.h      |  20 +-
 include/verilated_threads.cpp |   4 +-
 include/verilated_threads.h   |   6 +-
 include/verilated_vcd_c.cpp   |   8 +-
 include/verilated_vcd_c.h     |  14 +-
 include/verilated_vcd_sc.h    |   4 +-
 include/verilated_vpi.cpp     | 112 ++++----
 include/verilated_vpi.h       |   2 +-
 17 files changed, 532 insertions(+), 510 deletions(-)

diff --git a/include/verilated.cpp b/include/verilated.cpp
index 0885d9505..01d31413f 100644
--- a/include/verilated.cpp
+++ b/include/verilated.cpp
@@ -215,7 +215,7 @@ std::string _vl_string_vprintf(const char* formatp, va_list ap) VL_MT_SAFE {
     char* bufp = new char[len + 1];
     VL_VSNPRINTF(bufp, len + 1, formatp, ap);
 
-    std::string out = std::string(bufp, len);
+    const std::string out = std::string(bufp, len);
     delete[] bufp;
     return out;
 }
@@ -246,7 +246,7 @@ void VL_DBG_MSGF(const char* formatp, ...) VL_MT_SAFE {
     // includes that otherwise would be required in every Verilated module
     va_list ap;
     va_start(ap, formatp);
-    std::string out = _vl_string_vprintf(formatp, ap);
+    const std::string out = _vl_string_vprintf(formatp, ap);
     va_end(ap);
     // printf("-imm-V{t%d,%" VL_PRI64 "d}%s", VL_THREAD_ID(), _vl_dbg_sequence_number(),
     // out.c_str());
@@ -261,7 +261,7 @@ void VL_DBG_MSGF(const char* formatp, ...) VL_MT_SAFE {
 void VL_PRINTF_MT(const char* formatp, ...) VL_MT_SAFE {
     va_list ap;
     va_start(ap, formatp);
-    std::string out = _vl_string_vprintf(formatp, ap);
+    const std::string out = _vl_string_vprintf(formatp, ap);
     va_end(ap);
     VerilatedThreadMsgQueue::post(VerilatedMsg([=]() {  //
         VL_PRINTF("%s", out.c_str());
@@ -301,7 +301,7 @@ vluint64_t vl_rand64() VL_MT_SAFE {
         if (VL_COUNTONES_I(t_state[1]) < 10) t_state[1] = ~t_state[1];
     }
     // Xoroshiro128+ algorithm
-    vluint64_t result = t_state[0] + t_state[1];
+    const vluint64_t result = t_state[0] + t_state[1];
     t_state[1] ^= t_state[0];
     t_state[0] = (((t_state[0] << 55) | (t_state[0] >> 9)) ^ t_state[1] ^ (t_state[1] << 14));
     t_state[1] = (t_state[1] << 36) | (t_state[1] >> 28);
@@ -356,7 +356,7 @@ WDataOutP VL_ZERO_RESET_W(int obits, WDataOutP outwp) VL_MT_SAFE {
 //===========================================================================
 // Debug
 
-void _vl_debug_print_w(int lbits, WDataInP iwp) VL_MT_SAFE {
+void _vl_debug_print_w(int lbits, const WDataInP iwp) VL_MT_SAFE {
     VL_PRINTF_MT("  Data: w%d: ", lbits);
     for (int i = VL_WORDS_I(lbits) - 1; i >= 0; --i) VL_PRINTF_MT("%08x ", iwp[i]);
     VL_PRINTF_MT("\n");
@@ -365,24 +365,24 @@ void _vl_debug_print_w(int lbits, WDataInP iwp) VL_MT_SAFE {
 //===========================================================================
 // Slow math
 
-WDataOutP _vl_moddiv_w(int lbits, WDataOutP owp, WDataInP lwp, WDataInP rwp,
+WDataOutP _vl_moddiv_w(int lbits, WDataOutP owp, const WDataInP lwp, const WDataInP rwp,
                        bool is_modulus) VL_MT_SAFE {
     // See Knuth Algorithm D.  Computes u/v = q.r
     // This isn't massively tuned, as wide division is rare
     // for debug see V3Number version
     // Requires clean input
-    int words = VL_WORDS_I(lbits);
+    const int words = VL_WORDS_I(lbits);
     for (int i = 0; i < words; ++i) owp[i] = 0;
     // Find MSB and check for zero.
-    int umsbp1 = VL_MOSTSETBITP1_W(words, lwp);  // dividend
-    int vmsbp1 = VL_MOSTSETBITP1_W(words, rwp);  // divisor
+    const int umsbp1 = VL_MOSTSETBITP1_W(words, lwp);  // dividend
+    const int vmsbp1 = VL_MOSTSETBITP1_W(words, rwp);  // divisor
     if (VL_UNLIKELY(vmsbp1 == 0)  // rwp==0 so division by zero.  Return 0.
         || VL_UNLIKELY(umsbp1 == 0)) {  // 0/x so short circuit and return 0
         return owp;
     }
 
-    int uw = VL_WORDS_I(umsbp1);  // aka "m" in the algorithm
-    int vw = VL_WORDS_I(vmsbp1);  // aka "n" in the algorithm
+    const int uw = VL_WORDS_I(umsbp1);  // aka "m" in the algorithm
+    const int vw = VL_WORDS_I(vmsbp1);  // aka "n" in the algorithm
 
     if (vw == 1) {  // Single divisor word breaks rest of algorithm
         vluint64_t k = 0;
@@ -408,8 +408,8 @@ WDataOutP _vl_moddiv_w(int lbits, WDataOutP owp, WDataInP lwp, WDataInP rwp,
 
     // Algorithm requires divisor MSB to be set
     // Copy and shift to normalize divisor so MSB of vn[vw-1] is set
-    int s = 31 - VL_BITBIT_I(vmsbp1 - 1);  // shift amount (0...31)
-    vluint32_t shift_mask = s ? 0xffffffff : 0;  // otherwise >> 32 won't mask the value
+    const int s = 31 - VL_BITBIT_I(vmsbp1 - 1);  // shift amount (0...31)
+    const vluint32_t shift_mask = s ? 0xffffffff : 0;  // otherwise >> 32 won't mask the value
     for (int i = vw - 1; i > 0; --i) {
         vn[i] = (rwp[i] << s) | (shift_mask & (rwp[i - 1] >> (32 - s)));
     }
@@ -429,8 +429,8 @@ WDataOutP _vl_moddiv_w(int lbits, WDataOutP owp, WDataInP lwp, WDataInP rwp,
     // Main loop
     for (int j = uw - vw; j >= 0; --j) {
         // Estimate
-        vluint64_t unw64 = (static_cast<vluint64_t>(un[j + vw]) << 32ULL
-                            | static_cast<vluint64_t>(un[j + vw - 1]));
+        const vluint64_t unw64 = (static_cast<vluint64_t>(un[j + vw]) << 32ULL
+                                  | static_cast<vluint64_t>(un[j + vw - 1]));
         vluint64_t qhat = unw64 / static_cast<vluint64_t>(vn[vw - 1]);
         vluint64_t rhat = unw64 - qhat * static_cast<vluint64_t>(vn[vw - 1]);
 
@@ -478,8 +478,8 @@ WDataOutP _vl_moddiv_w(int lbits, WDataOutP owp, WDataInP lwp, WDataInP rwp,
     }
 }
 
-WDataOutP VL_POW_WWW(int obits, int, int rbits, WDataOutP owp, WDataInP lwp,
-                     WDataInP rwp) VL_MT_SAFE {
+WDataOutP VL_POW_WWW(int obits, int, int rbits, WDataOutP owp, const WDataInP lwp,
+                     const WDataInP rwp) VL_MT_SAFE {
     // obits==lbits, rbits can be different
     owp[0] = 1;
     for (int i = 1; i < VL_WORDS_I(obits); i++) owp[i] = 0;
@@ -501,13 +501,13 @@ WDataOutP VL_POW_WWW(int obits, int, int rbits, WDataOutP owp, WDataInP lwp,
     }
     return owp;
 }
-WDataOutP VL_POW_WWQ(int obits, int lbits, int rbits, WDataOutP owp, WDataInP lwp,
+WDataOutP VL_POW_WWQ(int obits, int lbits, int rbits, WDataOutP owp, const WDataInP lwp,
                      QData rhs) VL_MT_SAFE {
     VlWide<VL_WQ_WORDS_E> rhsw;
     VL_SET_WQ(rhsw, rhs);
     return VL_POW_WWW(obits, lbits, rbits, owp, lwp, rhsw);
 }
-QData VL_POW_QQW(int, int, int rbits, QData lhs, WDataInP rwp) VL_MT_SAFE {
+QData VL_POW_QQW(int, int, int rbits, QData lhs, const WDataInP rwp) VL_MT_SAFE {
     // Skip check for rhs == 0, as short-circuit doesn't save time
     if (VL_UNLIKELY(lhs == 0)) return 0;
     QData power = lhs;
@@ -519,11 +519,11 @@ QData VL_POW_QQW(int, int, int rbits, QData lhs, WDataInP rwp) VL_MT_SAFE {
     return out;
 }
 
-WDataOutP VL_POWSS_WWW(int obits, int, int rbits, WDataOutP owp, WDataInP lwp, WDataInP rwp,
-                       bool lsign, bool rsign) VL_MT_SAFE {
+WDataOutP VL_POWSS_WWW(int obits, int, int rbits, WDataOutP owp, const WDataInP lwp,
+                       const WDataInP rwp, bool lsign, bool rsign) VL_MT_SAFE {
     // obits==lbits, rbits can be different
     if (rsign && VL_SIGN_W(rbits, rwp)) {
-        int words = VL_WORDS_I(obits);
+        const int words = VL_WORDS_I(obits);
         VL_ZERO_W(obits, owp);
         EData lor = 0;  // 0=all zeros, ~0=all ones, else mix
         for (int i = 1; i < (words - 1); ++i) { lor |= lwp[i]; }
@@ -545,13 +545,13 @@ WDataOutP VL_POWSS_WWW(int obits, int, int rbits, WDataOutP owp, WDataInP lwp, W
     }
     return VL_POW_WWW(obits, rbits, rbits, owp, lwp, rwp);
 }
-WDataOutP VL_POWSS_WWQ(int obits, int lbits, int rbits, WDataOutP owp, WDataInP lwp, QData rhs,
-                       bool lsign, bool rsign) VL_MT_SAFE {
+WDataOutP VL_POWSS_WWQ(int obits, int lbits, int rbits, WDataOutP owp, const WDataInP lwp,
+                       QData rhs, bool lsign, bool rsign) VL_MT_SAFE {
     VlWide<VL_WQ_WORDS_E> rhsw;
     VL_SET_WQ(rhsw, rhs);
     return VL_POWSS_WWW(obits, lbits, rbits, owp, lwp, rhsw, lsign, rsign);
 }
-QData VL_POWSS_QQW(int obits, int, int rbits, QData lhs, WDataInP rwp, bool lsign,
+QData VL_POWSS_QQW(int obits, int, int rbits, QData lhs, const WDataInP rwp, bool lsign,
                    bool rsign) VL_MT_SAFE {
     // Skip check for rhs == 0, as short-circuit doesn't save time
     if (rsign && VL_SIGN_W(rbits, rwp)) {
@@ -571,23 +571,23 @@ QData VL_POWSS_QQW(int obits, int, int rbits, QData lhs, WDataInP rwp, bool lsig
     return VL_POW_QQW(obits, rbits, rbits, lhs, rwp);
 }
 
-double VL_ITOR_D_W(int lbits, WDataInP lwp) VL_PURE {
+double VL_ITOR_D_W(int lbits, const WDataInP lwp) VL_PURE {
     int ms_word = VL_WORDS_I(lbits) - 1;
     for (; !lwp[ms_word] && ms_word > 0;) --ms_word;
     if (ms_word == 0) return static_cast<double>(lwp[0]);
     if (ms_word == 1) return static_cast<double>(VL_SET_QW(lwp));
     // We need 53 bits of mantissa, which might mean looking at 3 words
     // namely ms_word, ms_word-1 and ms_word-2
-    EData ihi = lwp[ms_word];
-    EData imid = lwp[ms_word - 1];
-    EData ilo = lwp[ms_word - 2];
-    double hi = static_cast<double>(ihi) * std::exp2(2 * VL_EDATASIZE);
-    double mid = static_cast<double>(imid) * std::exp2(VL_EDATASIZE);
-    double lo = static_cast<double>(ilo);
-    double d = (hi + mid + lo) * std::exp2(VL_EDATASIZE * (ms_word - 2));
+    const EData ihi = lwp[ms_word];
+    const EData imid = lwp[ms_word - 1];
+    const EData ilo = lwp[ms_word - 2];
+    const double hi = static_cast<double>(ihi) * std::exp2(2 * VL_EDATASIZE);
+    const double mid = static_cast<double>(imid) * std::exp2(VL_EDATASIZE);
+    const double lo = static_cast<double>(ilo);
+    const double d = (hi + mid + lo) * std::exp2(VL_EDATASIZE * (ms_word - 2));
     return d;
 }
-double VL_ISTOR_D_W(int lbits, WDataInP lwp) VL_PURE {
+double VL_ISTOR_D_W(int lbits, const WDataInP lwp) VL_PURE {
     if (!VL_SIGN_W(lbits, lwp)) return VL_ITOR_D_W(lbits, lwp);
     vluint32_t pos[VL_MULS_MAX_WORDS + 1];  // Fixed size, as MSVC++ doesn't allow [words] here
     VL_NEGATE_W(VL_WORDS_I(lbits), pos, lwp);
@@ -599,8 +599,8 @@ double VL_ISTOR_D_W(int lbits, WDataInP lwp) VL_PURE {
 // Formatting
 
 // Output a string representation of a wide number
-std::string VL_DECIMAL_NW(int width, WDataInP lwp) VL_MT_SAFE {
-    int maxdecwidth = (width + 3) * 4 / 3;
+std::string VL_DECIMAL_NW(int width, const WDataInP lwp) VL_MT_SAFE {
+    const int maxdecwidth = (width + 3) * 4 / 3;
     // Or (maxdecwidth+7)/8], but can't have more than 4 BCD bits per word
     VlWide<VL_VALUE_STRING_MAX_WIDTH / 4 + 2> bcd;
     VL_ZERO_RESET_W(maxdecwidth, bcd);
@@ -652,17 +652,17 @@ std::string _vl_vsformat_time(char* tmp, T ld, int timeunit, bool left, size_t w
 
         WDataInP shifted = VL_EXTEND_WQ(b, 0, tmp0, static_cast<QData>(ld));
         if (shift < 0) {
-            WDataInP pow10 = VL_EXTEND_WQ(b, 0, tmp1, vl_time_pow10(-shift));
+            const WDataInP pow10 = VL_EXTEND_WQ(b, 0, tmp1, vl_time_pow10(-shift));
             shifted = VL_DIV_WWW(b, tmp2, shifted, pow10);
         } else {
-            WDataInP pow10 = VL_EXTEND_WQ(b, 0, tmp1, vl_time_pow10(shift));
+            const WDataInP pow10 = VL_EXTEND_WQ(b, 0, tmp1, vl_time_pow10(shift));
             shifted = VL_MUL_W(w, tmp2, shifted, pow10);
         }
 
-        WDataInP fracDigitsPow10 = VL_EXTEND_WQ(b, 0, tmp3, vl_time_pow10(fracDigits));
-        WDataInP integer = VL_DIV_WWW(b, tmp0, shifted, fracDigitsPow10);
-        WDataInP frac = VL_MODDIV_WWW(b, tmp1, shifted, fracDigitsPow10);
-        WDataInP max64Bit
+        const WDataInP fracDigitsPow10 = VL_EXTEND_WQ(b, 0, tmp3, vl_time_pow10(fracDigits));
+        const WDataInP integer = VL_DIV_WWW(b, tmp0, shifted, fracDigitsPow10);
+        const WDataInP frac = VL_MODDIV_WWW(b, tmp1, shifted, fracDigitsPow10);
+        const WDataInP max64Bit
             = VL_EXTEND_WQ(b, 0, tmp2, std::numeric_limits<vluint64_t>::max());  // breaks shifted
         if (VL_GT_W(w, integer, max64Bit)) {
             WDataOutP v = VL_ASSIGN_W(b, tmp3, integer);  // breaks fracDigitsPow10
@@ -674,7 +674,7 @@ std::string _vl_vsformat_time(char* tmp, T ld, int timeunit, bool left, size_t w
             *ptr = '\0';
             while (VL_GT_W(w, v, zero)) {
                 --ptr;
-                WDataInP mod = VL_MODDIV_WWW(b, tmp2, v, ten);  // breaks max64Bit
+                const WDataInP mod = VL_MODDIV_WWW(b, tmp2, v, ten);  // breaks max64Bit
                 *ptr = "0123456789"[VL_SET_QW(mod)];
                 VlWide<w> divided;
                 VL_DIV_WWW(b, divided, v, ten);
@@ -801,7 +801,7 @@ void _vl_vsformat(std::string& output, const char* formatp, va_list ap) VL_MT_SA
             case 'g':
             case '^': {  // Realtime
                 const int lbits = va_arg(ap, int);
-                double d = va_arg(ap, double);
+                const double d = va_arg(ap, double);
                 if (lbits) {}  // UNUSED - always 64
                 if (fmt == '^') {  // Realtime
                     if (!widthSet) width = Verilated::threadContextp()->impp()->timeFormatWidth();
@@ -834,7 +834,7 @@ void _vl_vsformat(std::string& output, const char* formatp, va_list ap) VL_MT_SA
                 }
                 switch (fmt) {
                 case 'c': {
-                    IData charval = ld & 0xff;
+                    const IData charval = ld & 0xff;
                     output += static_cast<char>(charval);
                     break;
                 }
@@ -842,7 +842,7 @@ void _vl_vsformat(std::string& output, const char* formatp, va_list ap) VL_MT_SA
                     std::string field;
                     for (; lsb >= 0; --lsb) {
                         lsb = (lsb / 8) * 8;  // Next digit
-                        IData charval = VL_BITRSHIFT_W(lwp, lsb) & 0xff;
+                        const IData charval = VL_BITRSHIFT_W(lwp, lsb) & 0xff;
                         field += (charval == 0) ? ' ' : charval;
                     }
                     std::string padding;
@@ -957,7 +957,7 @@ void _vl_vsformat(std::string& output, const char* formatp, va_list ap) VL_MT_SA
                     }
                     break;
                 default: {  // LCOV_EXCL_START
-                    std::string msg = std::string("Unknown _vl_vsformat code: ") + pos[0];
+                    const std::string msg = std::string("Unknown _vl_vsformat code: ") + pos[0];
                     VL_FATAL_MT(__FILE__, __LINE__, "", msg.c_str());
                     break;
                 }  // LCOV_EXCL_STOP
@@ -982,11 +982,11 @@ static inline void _vl_vsss_advance(FILE* fp, int& floc) VL_MT_SAFE {
         floc -= 8;
     }
 }
-static inline int _vl_vsss_peek(FILE* fp, int& floc, WDataInP fromp,
+static inline int _vl_vsss_peek(FILE* fp, int& floc, const WDataInP fromp,
                                 const std::string& fstr) VL_MT_SAFE {
     // Get a character without advancing
     if (fp) {
-        int data = std::fgetc(fp);
+        const int data = std::fgetc(fp);
         if (data == EOF) return EOF;
         ungetc(data, fp);
         return data;
@@ -1000,16 +1000,17 @@ static inline int _vl_vsss_peek(FILE* fp, int& floc, WDataInP fromp,
         }
     }
 }
-static inline void _vl_vsss_skipspace(FILE* fp, int& floc, WDataInP fromp,
+static inline void _vl_vsss_skipspace(FILE* fp, int& floc, const WDataInP fromp,
                                       const std::string& fstr) VL_MT_SAFE {
     while (true) {
-        int c = _vl_vsss_peek(fp, floc, fromp, fstr);
+        const int c = _vl_vsss_peek(fp, floc, fromp, fstr);
         if (c == EOF || !std::isspace(c)) return;
         _vl_vsss_advance(fp, floc);
     }
 }
-static inline void _vl_vsss_read_str(FILE* fp, int& floc, WDataInP fromp, const std::string& fstr,
-                                     char* tmpp, const char* acceptp) VL_MT_SAFE {
+static inline void _vl_vsss_read_str(FILE* fp, int& floc, const WDataInP fromp,
+                                     const std::string& fstr, char* tmpp,
+                                     const char* acceptp) VL_MT_SAFE {
     // Read into tmp, consisting of characters from acceptp list
     char* cp = tmpp;
     while (true) {
@@ -1023,8 +1024,9 @@ static inline void _vl_vsss_read_str(FILE* fp, int& floc, WDataInP fromp, const
     *cp++ = '\0';
     // VL_DBG_MSGF(" _read got='"<<tmpp<<"'\n");
 }
-static inline char* _vl_vsss_read_bin(FILE* fp, int& floc, WDataInP fromp, const std::string& fstr,
-                                      char* beginp, std::size_t n, bool inhibit = false) {
+static inline char* _vl_vsss_read_bin(FILE* fp, int& floc, const WDataInP fromp,
+                                      const std::string& fstr, char* beginp, std::size_t n,
+                                      bool inhibit = false) {
     // Variant of _vl_vsss_read_str using the same underlying I/O functions but optimized
     // specifically for block reads of N bytes (read operations are not demarcated by
     // whitespace). In the fp case, except descriptor to have been opened in binary mode.
@@ -1074,7 +1076,7 @@ static inline void _vl_vsss_based(WDataOutP owp, int obits, int baseLog2, const
 }
 
 IData _vl_vsscanf(FILE* fp,  // If a fscanf
-                  int fbits, WDataInP fromp,  // Else if a sscanf
+                  int fbits, const WDataInP fromp,  // Else if a sscanf
                   const std::string& fstr,  // if a sscanf to string
                   const char* formatp, va_list ap) VL_MT_SAFE {
     // Read a Verilog $sscanf/$fscanf style format into the output list
@@ -1240,7 +1242,7 @@ IData _vl_vsscanf(FILE* fp,  // If a fscanf
                     break;
                 }
                 default: {  // LCOV_EXCL_START
-                    std::string msg = std::string("Unknown _vl_vsscanf code: ") + pos[0];
+                    const std::string msg = std::string("Unknown _vl_vsscanf code: ") + pos[0];
                     VL_FATAL_MT(__FILE__, __LINE__, "", msg.c_str());
                     break;
                 }  // LCOV_EXCL_STOP
@@ -1282,7 +1284,7 @@ FILE* VL_CVT_I_FP(IData lhs) VL_MT_SAFE {
     return Verilated::threadContextp()->impp()->fdToFp(lhs);
 }
 
-void _vl_vint_to_string(int obits, char* destoutp, WDataInP sourcep) VL_MT_SAFE {
+void _vl_vint_to_string(int obits, char* destoutp, const WDataInP sourcep) VL_MT_SAFE {
     // See also VL_DATA_TO_STRING_NW
     int lsb = obits - 1;
     bool start = true;
@@ -1303,7 +1305,7 @@ void _vl_vint_to_string(int obits, char* destoutp, WDataInP sourcep) VL_MT_SAFE
 
 void _vl_string_to_vint(int obits, void* destp, size_t srclen, const char* srcp) VL_MT_SAFE {
     // Convert C string to Verilog format
-    size_t bytes = VL_BYTES_I(obits);
+    const size_t bytes = VL_BYTES_I(obits);
     char* op = reinterpret_cast<char*>(destp);
     if (srclen > bytes) srclen = bytes;  // Don't overflow destination
     size_t i = 0;
@@ -1315,7 +1317,7 @@ static IData getLine(std::string& str, IData fpi, size_t maxLen) VL_MT_SAFE {
     str.clear();
 
     // While threadsafe, each thread can only access different file handles
-    FILE* fp = VL_CVT_I_FP(fpi);
+    FILE* const fp = VL_CVT_I_FP(fpi);
     if (VL_UNLIKELY(!fp)) return 0;
 
     // We don't use fgets, as we must read \0s.
@@ -1331,7 +1333,7 @@ static IData getLine(std::string& str, IData fpi, size_t maxLen) VL_MT_SAFE {
 IData VL_FGETS_IXI(int obits, void* destp, IData fpi) VL_MT_SAFE {
     std::string str;
     const IData bytes = VL_BYTES_I(obits);
-    IData got = getLine(str, fpi, bytes);
+    const IData got = getLine(str, fpi, bytes);
 
     if (VL_UNLIKELY(str.empty())) return 0;
 
@@ -1351,7 +1353,7 @@ IData VL_FGETS_NI(std::string& dest, IData fpi) VL_MT_SAFE {
 
 IData VL_FERROR_IN(IData, std::string& outputr) VL_MT_SAFE {
     // We ignore lhs/fpi - IEEE says "most recent error" so probably good enough
-    IData ret = errno;
+    const IData ret = errno;
     outputr = std::string(::std::strerror(ret));
     return ret;
 }
@@ -1474,12 +1476,12 @@ void VL_FWRITEF(IData fpi, const char* formatp, ...) VL_MT_SAFE {
 
 IData VL_FSCANF_IX(IData fpi, const char* formatp, ...) VL_MT_SAFE {
     // While threadsafe, each thread can only access different file handles
-    FILE* fp = VL_CVT_I_FP(fpi);
+    FILE* const fp = VL_CVT_I_FP(fpi);
     if (VL_UNLIKELY(!fp)) return 0;
 
     va_list ap;
     va_start(ap, formatp);
-    IData got = _vl_vsscanf(fp, 0, nullptr, "", formatp, ap);
+    const IData got = _vl_vsscanf(fp, 0, nullptr, "", formatp, ap);
     va_end(ap);
     return got;
 }
@@ -1490,7 +1492,7 @@ IData VL_SSCANF_IIX(int lbits, IData ld, const char* formatp, ...) VL_MT_SAFE {
 
     va_list ap;
     va_start(ap, formatp);
-    IData got = _vl_vsscanf(nullptr, lbits, fnw, "", formatp, ap);
+    const IData got = _vl_vsscanf(nullptr, lbits, fnw, "", formatp, ap);
     va_end(ap);
     return got;
 }
@@ -1500,21 +1502,21 @@ IData VL_SSCANF_IQX(int lbits, QData ld, const char* formatp, ...) VL_MT_SAFE {
 
     va_list ap;
     va_start(ap, formatp);
-    IData got = _vl_vsscanf(nullptr, lbits, fnw, "", formatp, ap);
+    const IData got = _vl_vsscanf(nullptr, lbits, fnw, "", formatp, ap);
     va_end(ap);
     return got;
 }
-IData VL_SSCANF_IWX(int lbits, WDataInP lwp, const char* formatp, ...) VL_MT_SAFE {
+IData VL_SSCANF_IWX(int lbits, const WDataInP lwp, const char* formatp, ...) VL_MT_SAFE {
     va_list ap;
     va_start(ap, formatp);
-    IData got = _vl_vsscanf(nullptr, lbits, lwp, "", formatp, ap);
+    const IData got = _vl_vsscanf(nullptr, lbits, lwp, "", formatp, ap);
     va_end(ap);
     return got;
 }
 IData VL_SSCANF_INX(int, const std::string& ld, const char* formatp, ...) VL_MT_SAFE {
     va_list ap;
     va_start(ap, formatp);
-    IData got = _vl_vsscanf(nullptr, ld.length() * 8, nullptr, ld, formatp, ap);
+    const IData got = _vl_vsscanf(nullptr, ld.length() * 8, nullptr, ld, formatp, ap);
     va_end(ap);
     return got;
 }
@@ -1522,7 +1524,7 @@ IData VL_SSCANF_INX(int, const std::string& ld, const char* formatp, ...) VL_MT_
 IData VL_FREAD_I(int width, int array_lsb, int array_size, void* memp, IData fpi, IData start,
                  IData count) VL_MT_SAFE {
     // While threadsafe, each thread can only access different file handles
-    FILE* fp = VL_CVT_I_FP(fpi);
+    FILE* const fp = VL_CVT_I_FP(fpi);
     if (VL_UNLIKELY(!fp)) return 0;
     if (count > (array_size - (start - array_lsb))) count = array_size - (start - array_lsb);
     // Prep for reading
@@ -1576,10 +1578,10 @@ IData VL_SYSTEM_IQ(QData lhs) VL_MT_SAFE {
     VL_SET_WQ(lhsw, lhs);
     return VL_SYSTEM_IW(VL_WQ_WORDS_E, lhsw);
 }
-IData VL_SYSTEM_IW(int lhswords, WDataInP lhsp) VL_MT_SAFE {
+IData VL_SYSTEM_IW(int lhswords, const WDataInP lhsp) VL_MT_SAFE {
     char filenamez[VL_TO_STRING_MAX_WORDS * VL_EDATASIZE + 1];
     _vl_vint_to_string(lhswords * VL_EDATASIZE, filenamez, lhsp);
-    int code = std::system(filenamez);  // Yes, std::system() is threadsafe
+    const int code = std::system(filenamez);  // Yes, std::system() is threadsafe
     return code >> 8;  // Want exit status
 }
 
@@ -1707,7 +1709,7 @@ std::string VL_TO_STRING(CData lhs) { return VL_SFORMATF_NX("'h%0x", 8, lhs); }
 std::string VL_TO_STRING(SData lhs) { return VL_SFORMATF_NX("'h%0x", 16, lhs); }
 std::string VL_TO_STRING(IData lhs) { return VL_SFORMATF_NX("'h%0x", 32, lhs); }
 std::string VL_TO_STRING(QData lhs) { return VL_SFORMATF_NX("'h%0x", 64, lhs); }
-std::string VL_TO_STRING_W(int words, WDataInP obj) {
+std::string VL_TO_STRING_W(int words, const WDataInP obj) {
     return VL_SFORMATF_NX("'h%0x", words * VL_EDATASIZE, obj);
 }
 
@@ -1722,7 +1724,7 @@ std::string VL_TOUPPER_NN(const std::string& ld) VL_MT_SAFE {
     return out;
 }
 
-std::string VL_CVT_PACK_STR_NW(int lwords, WDataInP lwp) VL_MT_SAFE {
+std::string VL_CVT_PACK_STR_NW(int lwords, const WDataInP lwp) VL_MT_SAFE {
     // See also _vl_vint_to_string
     char destout[VL_TO_STRING_MAX_WORDS * VL_EDATASIZE + 1];
     int obits = lwords * VL_EDATASIZE;
@@ -1804,7 +1806,7 @@ static const char* formatBinary(int nBits, vluint32_t bits) {
 
     static VL_THREAD_LOCAL char t_buf[64];
     for (int i = 0; i < nBits; i++) {
-        bool isOne = bits & (1 << (nBits - 1 - i));
+        const bool isOne = bits & (1 << (nBits - 1 - i));
         t_buf[i] = (isOne ? '1' : '0');
     }
     t_buf[nBits] = '\0';
@@ -1885,7 +1887,7 @@ bool VlReadMem::get(QData& addrr, std::string& valuer) {
             // Check for hex or binary digits as file format requests
             else if (std::isxdigit(c) || (!reading_addr && (c == 'x' || c == 'X'))) {
                 c = std::tolower(c);
-                int value
+                const int value
                     = (c >= 'a' ? (c == 'x' ? VL_RAND_RESET_I(4) : (c - 'a' + 10)) : (c - '0'));
                 if (reading_addr) {
                     // Decode @ addresses
@@ -1914,12 +1916,13 @@ bool VlReadMem::get(QData& addrr, std::string& valuer) {
     return false;  // EOF
 }
 void VlReadMem::setData(void* valuep, const std::string& rhs) {
-    QData shift = m_hex ? 4ULL : 1ULL;
+    const QData shift = m_hex ? 4ULL : 1ULL;
     bool innum = false;
     // Shift value in
     for (const auto& i : rhs) {
-        char c = std::tolower(i);
-        int value = (c >= 'a' ? (c == 'x' ? VL_RAND_RESET_I(4) : (c - 'a' + 10)) : (c - '0'));
+        const char c = std::tolower(i);
+        const int value
+            = (c >= 'a' ? (c == 'x' ? VL_RAND_RESET_I(4) : (c - 'a' + 10)) : (c - '0'));
         if (m_bits <= 8) {
             CData* datap = reinterpret_cast<CData*>(valuep);
             if (!innum) *datap = 0;
@@ -2001,9 +2004,9 @@ void VlWriteMem::print(QData addr, bool addrstamp, const void* valuep) {
         }
     } else if (m_bits <= 64) {
         const QData* datap = reinterpret_cast<const QData*>(valuep);
-        vluint64_t value = VL_MASK_Q(m_bits) & *datap;
-        vluint32_t lo = value & 0xffffffff;
-        vluint32_t hi = value >> 32;
+        const vluint64_t value = VL_MASK_Q(m_bits) & *datap;
+        const vluint32_t lo = value & 0xffffffff;
+        const vluint32_t hi = value >> 32;
         if (m_hex) {
             fprintf(m_fp, memhFormat(m_bits - 32), hi);
             fprintf(m_fp, "%08x\n", lo);
@@ -2012,7 +2015,7 @@ void VlWriteMem::print(QData addr, bool addrstamp, const void* valuep) {
             fprintf(m_fp, "%s\n", formatBinary(32, lo));
         }
     } else {
-        WDataInP datap = reinterpret_cast<WDataInP>(valuep);
+        const WDataInP datap = reinterpret_cast<WDataInP>(valuep);
         // output as a sequence of VL_EDATASIZE'd words
         // from MSB to LSB. Mask off the MSB word which could
         // contain junk above the top of valid data.
@@ -2022,7 +2025,7 @@ void VlWriteMem::print(QData addr, bool addrstamp, const void* valuep) {
             EData data = datap[word_idx];
             if (first) {
                 data &= VL_MASK_E(m_bits);
-                int top_word_nbits = VL_BITBIT_E(m_bits - 1) + 1;
+                const int top_word_nbits = VL_BITBIT_E(m_bits - 1) + 1;
                 if (m_hex) {
                     fprintf(m_fp, memhFormat(top_word_nbits), data);
                 } else {
@@ -2108,7 +2111,7 @@ void VL_WRITEMEM_N(bool hex,  // Hex format, else binary
     if (VL_UNLIKELY(!wmem.isOpen())) return;
 
     for (QData addr = start; addr <= end; ++addr) {
-        QData row_offset = addr - array_lsb;
+        const QData row_offset = addr - array_lsb;
         if (bits <= 8) {
             const CData* datap = &(reinterpret_cast<const CData*>(memp))[row_offset];
             wmem.print(addr, false, datap);
@@ -2122,8 +2125,8 @@ void VL_WRITEMEM_N(bool hex,  // Hex format, else binary
             const QData* datap = &(reinterpret_cast<const QData*>(memp))[row_offset];
             wmem.print(addr, false, datap);
         } else {
-            WDataInP memDatap = reinterpret_cast<WDataInP>(memp);
-            WDataInP datap = &memDatap[row_offset * VL_WORDS_I(bits)];
+            const WDataInP memDatap = reinterpret_cast<WDataInP>(memp);
+            const WDataInP datap = &memDatap[row_offset * VL_WORDS_I(bits)];
             wmem.print(addr, false, datap);
         }
     }
@@ -2351,7 +2354,7 @@ void VerilatedContext::timeprecision(int value) VL_MT_SAFE {
     const VerilatedLockGuard lock(m_mutex);
     m_s.m_timeprecision = value;
 #ifdef SYSTEMC_VERSION
-    sc_time sc_res = sc_get_time_resolution();
+    const sc_time sc_res = sc_get_time_resolution();
     int sc_prec = 99;
     if (sc_res == sc_time(1, SC_SEC)) {
         sc_prec = 0;
@@ -2373,7 +2376,7 @@ void VerilatedContext::timeprecision(int value) VL_MT_SAFE {
             << ". Suggest use 'sc_set_time_resolution(" << vl_time_str(value)
             << ")', or Verilator '--timescale-override " << vl_time_str(sc_prec) << "/"
             << vl_time_str(sc_prec) << "'";
-        std::string msgs = msg.str();
+        const std::string msgs = msg.str();
         VL_FATAL_MT("", 0, "", msgs.c_str());
     }
 #endif
@@ -2434,7 +2437,7 @@ std::string VerilatedContextImp::argPlusMatch(const char* prefixp)
     VL_MT_SAFE_EXCLUDES(m_argMutex) {
     const VerilatedLockGuard lock(m_argMutex);
     // Note prefixp does not include the leading "+"
-    size_t len = std::strlen(prefixp);
+    const size_t len = std::strlen(prefixp);
     if (VL_UNLIKELY(!m_args.m_argVecLoaded)) {
         m_args.m_argVecLoaded = true;  // Complain only once
         VL_FATAL_MT("unknown", 0, "",
@@ -2511,7 +2514,7 @@ void VerilatedContextImp::commandArgVl(const std::string& arg) {
 }
 bool VerilatedContextImp::commandArgVlValue(const std::string& arg, const std::string& prefix,
                                             std::string& valuer) {
-    size_t len = prefix.length();
+    const size_t len = prefix.length();
     if (0 == std::strncmp(prefix.c_str(), arg.c_str(), len)) {
         valuer = arg.substr(len);
         return true;
@@ -2528,7 +2531,7 @@ void VerilatedContext::randSeed(int val) VL_MT_SAFE {
     // and so the rand seed's mutex must also be static
     const VerilatedLockGuard lock(VerilatedContextImp::s().s_randMutex);
     m_s.m_randSeed = val;
-    vluint64_t newEpoch = VerilatedContextImp::s().s_randSeedEpoch + 1;
+    const vluint64_t newEpoch = VerilatedContextImp::s().s_randSeedEpoch + 1;
     // Obververs must see new epoch AFTER seed updated
 #ifdef VL_THREADED
     std::atomic_signal_fence(std::memory_order_release);
@@ -2623,7 +2626,7 @@ const char* Verilated::catName(const char* n1, const char* n2, int scopet,
     // Used by symbol table creation to make module names
     static VL_THREAD_LOCAL char* t_strp = nullptr;
     static VL_THREAD_LOCAL size_t t_len = 0;
-    size_t newlen
+    const size_t newlen
         = std::strlen(n1) + std::strlen(n2) + std::strlen(delimiter) + (scopet > 0 ? 2 : 1);
     if (VL_UNLIKELY(!t_strp || newlen > t_len)) {
         if (t_strp) delete[] t_strp;
@@ -2726,8 +2729,8 @@ void Verilated::nullPointerError(const char* filename, int linenum) VL_MT_SAFE {
 
 void Verilated::overWidthError(const char* signame) VL_MT_SAFE {
     // Slowpath - Called only when signal sets too high of a bit
-    std::string msg = (std::string("Testbench C set input '") + signame
-                       + "' to value that overflows what the signal's width can fit");
+    const std::string msg = (std::string("Testbench C set input '") + signame
+                             + "' to value that overflows what the signal's width can fit");
     VL_FATAL_MT("unknown", 0, "", msg.c_str());
     VL_UNREACHABLE
 }
@@ -2889,8 +2892,8 @@ void VerilatedScope::varInsert(int finalize, const char* namep, void* datap, boo
     va_list ap;
     va_start(ap, dims);
     for (int i = 0; i < dims; ++i) {
-        int msb = va_arg(ap, int);
-        int lsb = va_arg(ap, int);
+        const int msb = va_arg(ap, int);
+        const int lsb = va_arg(ap, int);
         if (i == 0) {
             var.m_packed.m_left = msb;
             var.m_packed.m_right = lsb;
@@ -2921,18 +2924,20 @@ VerilatedVar* VerilatedScope::varFind(const char* namep) const VL_MT_SAFE_POSTIN
 
 void* VerilatedScope::exportFindNullError(int funcnum) VL_MT_SAFE {
     // Slowpath - Called only when find has failed
-    std::string msg = (std::string("Testbench C called '") + VerilatedImp::exportName(funcnum)
-                       + "' but scope wasn't set, perhaps due to dpi import call without "
-                       + "'context', or missing svSetScope. See IEEE 1800-2017 35.5.3.");
+    const std::string msg
+        = (std::string("Testbench C called '") + VerilatedImp::exportName(funcnum)
+           + "' but scope wasn't set, perhaps due to dpi import call without "
+           + "'context', or missing svSetScope. See IEEE 1800-2017 35.5.3.");
     VL_FATAL_MT("unknown", 0, "", msg.c_str());
     return nullptr;
 }
 
 void* VerilatedScope::exportFindError(int funcnum) const {
     // Slowpath - Called only when find has failed
-    std::string msg = (std::string("Testbench C called '") + VerilatedImp::exportName(funcnum)
-                       + "' but this DPI export function exists only in other scopes, not scope '"
-                       + name() + "'");
+    const std::string msg
+        = (std::string("Testbench C called '") + VerilatedImp::exportName(funcnum)
+           + "' but this DPI export function exists only in other scopes, not scope '" + name()
+           + "'");
     VL_FATAL_MT("unknown", 0, "", msg.c_str());
     return nullptr;
 }
diff --git a/include/verilated.h b/include/verilated.h
index fcd87fb8d..107f217de 100644
--- a/include/verilated.h
+++ b/include/verilated.h
@@ -972,7 +972,7 @@ inline QData VL_RDTSC_Q() {
 extern void VL_PRINTTIMESCALE(const char* namep, const char* timeunitp,
                               const VerilatedContext* contextp) VL_MT_SAFE;
 
-extern WDataOutP _vl_moddiv_w(int lbits, WDataOutP owp, WDataInP lwp, WDataInP rwp,
+extern WDataOutP _vl_moddiv_w(int lbits, WDataOutP owp, WDataInP const lwp, WDataInP const rwp,
                               bool is_modulus);
 
 extern IData VL_FGETS_IXI(int obits, void* destp, IData fpi);
@@ -991,7 +991,7 @@ extern void VL_FWRITEF(IData fpi, const char* formatp, ...);
 extern IData VL_FSCANF_IX(IData fpi, const char* formatp, ...);
 extern IData VL_SSCANF_IIX(int lbits, IData ld, const char* formatp, ...);
 extern IData VL_SSCANF_IQX(int lbits, QData ld, const char* formatp, ...);
-extern IData VL_SSCANF_IWX(int lbits, WDataInP lwp, const char* formatp, ...);
+extern IData VL_SSCANF_IWX(int lbits, WDataInP const lwp, const char* formatp, ...);
 
 extern void VL_SFORMAT_X(int obits, CData& destr, const char* formatp, ...);
 extern void VL_SFORMAT_X(int obits, SData& destr, const char* formatp, ...);
@@ -999,7 +999,7 @@ extern void VL_SFORMAT_X(int obits, IData& destr, const char* formatp, ...);
 extern void VL_SFORMAT_X(int obits, QData& destr, const char* formatp, ...);
 extern void VL_SFORMAT_X(int obits, void* destp, const char* formatp, ...);
 
-extern IData VL_SYSTEM_IW(int lhswords, WDataInP lhsp);
+extern IData VL_SYSTEM_IW(int lhswords, WDataInP const lhsp);
 extern IData VL_SYSTEM_IQ(QData lhs);
 inline IData VL_SYSTEM_II(IData lhs) VL_MT_SAFE { return VL_SYSTEM_IQ(lhs); }
 
@@ -1069,7 +1069,7 @@ static inline QData VL_CVT_Q_D(double lhs) VL_PURE {
 // clang-format on
 
 // Return double from lhs (numeric) unsigned
-double VL_ITOR_D_W(int lbits, WDataInP lwp) VL_PURE;
+double VL_ITOR_D_W(int lbits, WDataInP const lwp) VL_PURE;
 static inline double VL_ITOR_D_I(int, IData lhs) VL_PURE {
     return static_cast<double>(static_cast<vluint32_t>(lhs));
 }
@@ -1077,7 +1077,7 @@ static inline double VL_ITOR_D_Q(int, QData lhs) VL_PURE {
     return static_cast<double>(static_cast<vluint64_t>(lhs));
 }
 // Return double from lhs (numeric) signed
-double VL_ISTOR_D_W(int lbits, WDataInP lwp) VL_PURE;
+double VL_ISTOR_D_W(int lbits, WDataInP const lwp) VL_PURE;
 static inline double VL_ISTOR_D_I(int lbits, IData lhs) VL_PURE {
     if (lbits == 32) return static_cast<double>(static_cast<vlsint32_t>(lhs));
     WData lwp[VL_WQ_WORDS_E];
@@ -1114,7 +1114,7 @@ static inline QData VL_EXTENDSIGN_Q(int lbits, QData lhs) VL_PURE {
 }
 
 // Debugging prints
-extern void _vl_debug_print_w(int lbits, WDataInP iwp);
+extern void _vl_debug_print_w(int lbits, WDataInP const iwp);
 
 //=========================================================================
 // Pli macros
@@ -1223,23 +1223,23 @@ vluint64_t vl_time_pow10(int n) VL_PURE;
 // EMIT_RULE: VL_ASSIGNCLEAN:  oclean=clean; obits==lbits;
 #define VL_ASSIGNCLEAN_W(obits, owp, lwp) VL_CLEAN_WW((obits), (obits), (owp), (lwp))
 static inline WDataOutP _vl_clean_inplace_w(int obits, WDataOutP owp) VL_MT_SAFE {
-    int words = VL_WORDS_I(obits);
+    const int words = VL_WORDS_I(obits);
     owp[words - 1] &= VL_MASK_E(obits);
     return owp;
 }
-static inline WDataOutP VL_CLEAN_WW(int obits, int, WDataOutP owp, WDataInP lwp) VL_MT_SAFE {
-    int words = VL_WORDS_I(obits);
+static inline WDataOutP VL_CLEAN_WW(int obits, int, WDataOutP owp, WDataInP const lwp) VL_MT_SAFE {
+    const int words = VL_WORDS_I(obits);
     for (int i = 0; (i < (words - 1)); ++i) owp[i] = lwp[i];
     owp[words - 1] = lwp[words - 1] & VL_MASK_E(obits);
     return owp;
 }
 static inline WDataOutP VL_ZERO_W(int obits, WDataOutP owp) VL_MT_SAFE {
-    int words = VL_WORDS_I(obits);
+    const int words = VL_WORDS_I(obits);
     for (int i = 0; i < words; ++i) owp[i] = 0;
     return owp;
 }
 static inline WDataOutP VL_ALLONES_W(int obits, WDataOutP owp) VL_MT_SAFE {
-    int words = VL_WORDS_I(obits);
+    const int words = VL_WORDS_I(obits);
     for (int i = 0; i < (words - 1); ++i) owp[i] = ~VL_EUL(0);
     owp[words - 1] = VL_MASK_E(obits);
     return owp;
@@ -1248,8 +1248,8 @@ static inline WDataOutP VL_ALLONES_W(int obits, WDataOutP owp) VL_MT_SAFE {
 // EMIT_RULE: VL_ASSIGN:  oclean=rclean; obits==lbits;
 // For now, we always have a clean rhs.
 // Note: If a ASSIGN isn't clean, use VL_ASSIGNCLEAN instead to do the same thing.
-static inline WDataOutP VL_ASSIGN_W(int obits, WDataOutP owp, WDataInP lwp) VL_MT_SAFE {
-    int words = VL_WORDS_I(obits);
+static inline WDataOutP VL_ASSIGN_W(int obits, WDataOutP owp, WDataInP const lwp) VL_MT_SAFE {
+    const int words = VL_WORDS_I(obits);
     for (int i = 0; i < words; ++i) owp[i] = lwp[i];
     return owp;
 }
@@ -1286,7 +1286,7 @@ static inline void VL_ASSIGNBIT_QO(int, int bit, QData& lhsr, IData) VL_PURE {
     lhsr = (lhsr | (1ULL << VL_BITBIT_Q(bit)));
 }
 static inline void VL_ASSIGNBIT_WO(int, int bit, WDataOutP owp, IData) VL_MT_SAFE {
-    EData orig = owp[VL_BITWORD_E(bit)];
+    const EData orig = owp[VL_BITWORD_E(bit)];
     owp[VL_BITWORD_E(bit)] = (orig | (VL_EUL(1) << VL_BITBIT_E(bit)));
 }
 
@@ -1310,7 +1310,7 @@ static inline void VL_ASSIGNBIT_WO(int, int bit, WDataOutP owp, IData) VL_MT_SAF
     }
 #define VL_ASSIGN_WSW(obits, owp, svar) \
     { \
-        int words = VL_WORDS_I(obits); \
+        const int words = VL_WORDS_I(obits); \
         for (int i = 0; i < words; ++i) (owp)[i] = (svar).read().get_word(i); \
         (owp)[words - 1] &= VL_MASK_E(obits); \
     }
@@ -1321,7 +1321,7 @@ static inline void VL_ASSIGNBIT_WO(int, int bit, WDataOutP owp, IData) VL_MT_SAF
     { (vvar) = VL_CLEAN_QQ((obits), (obits), (svar).read().to_uint64()); }
 #define VL_ASSIGN_WSB(obits, owp, svar) \
     { \
-        int words = VL_WORDS_I(obits); \
+        const int words = VL_WORDS_I(obits); \
         sc_biguint<(obits)> _butemp = (svar).read(); \
         for (int i = 0; i < words; ++i) { \
             int msb = ((i + 1) * VL_IDATASIZE) - 1; \
@@ -1401,7 +1401,7 @@ static inline WDataOutP VL_EXTEND_WQ(int obits, int, WDataOutP owp, QData ld) VL
     return owp;
 }
 static inline WDataOutP VL_EXTEND_WW(int obits, int lbits, WDataOutP owp,
-                                     WDataInP lwp) VL_MT_SAFE {
+                                     WDataInP const lwp) VL_MT_SAFE {
     for (int i = 0; i < VL_WORDS_I(lbits); ++i) owp[i] = lwp[i];
     for (int i = VL_WORDS_I(lbits); i < VL_WORDS_I(obits); ++i) owp[i] = 0;
     return owp;
@@ -1420,23 +1420,23 @@ static inline QData VL_EXTENDS_QQ(int, int lbits, QData lhs) VL_PURE {
 }
 
 static inline WDataOutP VL_EXTENDS_WI(int obits, int lbits, WDataOutP owp, IData ld) VL_MT_SAFE {
-    EData sign = VL_SIGNONES_E(lbits, static_cast<EData>(ld));
+    const EData sign = VL_SIGNONES_E(lbits, static_cast<EData>(ld));
     owp[0] = ld | (sign & ~VL_MASK_E(lbits));
     for (int i = 1; i < VL_WORDS_I(obits); ++i) owp[i] = sign;
     return owp;
 }
 static inline WDataOutP VL_EXTENDS_WQ(int obits, int lbits, WDataOutP owp, QData ld) VL_MT_SAFE {
     VL_SET_WQ(owp, ld);
-    EData sign = VL_SIGNONES_E(lbits, owp[1]);
+    const EData sign = VL_SIGNONES_E(lbits, owp[1]);
     owp[1] |= sign & ~VL_MASK_E(lbits);
     for (int i = VL_WQ_WORDS_E; i < VL_WORDS_I(obits); ++i) owp[i] = sign;
     return owp;
 }
 static inline WDataOutP VL_EXTENDS_WW(int obits, int lbits, WDataOutP owp,
-                                      WDataInP lwp) VL_MT_SAFE {
+                                      WDataInP const lwp) VL_MT_SAFE {
     for (int i = 0; i < VL_WORDS_I(lbits) - 1; ++i) owp[i] = lwp[i];
-    int lmsw = VL_WORDS_I(lbits) - 1;
-    EData sign = VL_SIGNONES_E(lbits, lwp[lmsw]);
+    const int lmsw = VL_WORDS_I(lbits) - 1;
+    const EData sign = VL_SIGNONES_E(lbits, lwp[lmsw]);
     owp[lmsw] = lwp[lmsw] | (sign & ~VL_MASK_E(lbits));
     for (int i = VL_WORDS_I(lbits); i < VL_WORDS_I(obits); ++i) owp[i] = sign;
     return owp;
@@ -1448,8 +1448,8 @@ static inline WDataOutP VL_EXTENDS_WW(int obits, int lbits, WDataOutP owp,
 // EMIT_RULE: VL_REDAND:  oclean=clean; lclean==clean; obits=1;
 #define VL_REDAND_II(obits, lbits, lhs) ((lhs) == VL_MASK_I(lbits))
 #define VL_REDAND_IQ(obits, lbits, lhs) ((lhs) == VL_MASK_Q(lbits))
-static inline IData VL_REDAND_IW(int, int lbits, WDataInP lwp) VL_MT_SAFE {
-    int words = VL_WORDS_I(lbits);
+static inline IData VL_REDAND_IW(int, int lbits, WDataInP const lwp) VL_MT_SAFE {
+    const int words = VL_WORDS_I(lbits);
     EData combine = lwp[0];
     for (int i = 1; i < words - 1; ++i) combine &= lwp[i];
     combine &= ~VL_MASK_E(lbits) | lwp[words - 1];
@@ -1459,7 +1459,7 @@ static inline IData VL_REDAND_IW(int, int lbits, WDataInP lwp) VL_MT_SAFE {
 // EMIT_RULE: VL_REDOR:  oclean=clean; lclean==clean; obits=1;
 #define VL_REDOR_I(lhs) ((lhs) != 0)
 #define VL_REDOR_Q(lhs) ((lhs) != 0)
-static inline IData VL_REDOR_W(int words, WDataInP lwp) VL_MT_SAFE {
+static inline IData VL_REDOR_W(int words, WDataInP const lwp) VL_MT_SAFE {
     EData equal = 0;
     for (int i = 0; i < words; ++i) equal |= lwp[i];
     return (equal != 0);
@@ -1526,7 +1526,7 @@ static inline IData VL_REDXOR_64(QData r) VL_PURE {
     return static_cast<IData>(r);
 #endif
 }
-static inline IData VL_REDXOR_W(int words, WDataInP lwp) VL_MT_SAFE {
+static inline IData VL_REDXOR_W(int words, WDataInP const lwp) VL_MT_SAFE {
     EData r = lwp[0];
     for (int i = 1; i < words; ++i) r ^= lwp[i];
     return VL_REDXOR_32(r);
@@ -1545,7 +1545,7 @@ static inline IData VL_COUNTONES_Q(QData lhs) VL_PURE {
     return VL_COUNTONES_I(static_cast<IData>(lhs)) + VL_COUNTONES_I(static_cast<IData>(lhs >> 32));
 }
 #define VL_COUNTONES_E VL_COUNTONES_I
-static inline IData VL_COUNTONES_W(int words, WDataInP lwp) VL_MT_SAFE {
+static inline IData VL_COUNTONES_W(int words, WDataInP const lwp) VL_MT_SAFE {
     EData r = 0;
     for (int i = 0; i < words; ++i) r += VL_COUNTONES_E(lwp[i]);
     return r;
@@ -1570,8 +1570,8 @@ static inline IData VL_COUNTBITS_Q(int lbits, QData lhs, IData ctrl0, IData ctrl
            + VL_COUNTBITS_I(lbits - 32, static_cast<IData>(lhs >> 32), ctrl0, ctrl1, ctrl2);
 }
 #define VL_COUNTBITS_E VL_COUNTBITS_I
-static inline IData VL_COUNTBITS_W(int lbits, int words, WDataInP lwp, IData ctrl0, IData ctrl1,
-                                   IData ctrl2) VL_MT_SAFE {
+static inline IData VL_COUNTBITS_W(int lbits, int words, WDataInP const lwp, IData ctrl0,
+                                   IData ctrl1, IData ctrl2) VL_MT_SAFE {
     EData r = 0;
     IData wordLbits = 32;
     for (int i = 0; i < words; ++i) {
@@ -1587,7 +1587,7 @@ static inline IData VL_ONEHOT_I(IData lhs) VL_PURE {
 static inline IData VL_ONEHOT_Q(QData lhs) VL_PURE {
     return (((lhs & (lhs - 1)) == 0) & (lhs != 0));
 }
-static inline IData VL_ONEHOT_W(int words, WDataInP lwp) VL_MT_SAFE {
+static inline IData VL_ONEHOT_W(int words, WDataInP const lwp) VL_MT_SAFE {
     EData one = 0;
     for (int i = 0; (i < words); ++i) {
         if (lwp[i]) {
@@ -1601,7 +1601,7 @@ static inline IData VL_ONEHOT_W(int words, WDataInP lwp) VL_MT_SAFE {
 
 static inline IData VL_ONEHOT0_I(IData lhs) VL_PURE { return ((lhs & (lhs - 1)) == 0); }
 static inline IData VL_ONEHOT0_Q(QData lhs) VL_PURE { return ((lhs & (lhs - 1)) == 0); }
-static inline IData VL_ONEHOT0_W(int words, WDataInP lwp) VL_MT_SAFE {
+static inline IData VL_ONEHOT0_W(int words, WDataInP const lwp) VL_MT_SAFE {
     bool one = false;
     for (int i = 0; (i < words); ++i) {
         if (lwp[i]) {
@@ -1628,7 +1628,7 @@ static inline IData VL_CLOG2_Q(QData lhs) VL_PURE {
     for (; lhs != 0; ++shifts) lhs = lhs >> 1ULL;
     return shifts;
 }
-static inline IData VL_CLOG2_W(int words, WDataInP lwp) VL_MT_SAFE {
+static inline IData VL_CLOG2_W(int words, WDataInP const lwp) VL_MT_SAFE {
     EData adjust = (VL_COUNTONES_W(words, lwp) == 1) ? 0 : 1;
     for (int i = words - 1; i >= 0; --i) {
         if (VL_UNLIKELY(lwp[i])) {  // Shorter worst case if predict not taken
@@ -1643,7 +1643,7 @@ static inline IData VL_CLOG2_W(int words, WDataInP lwp) VL_MT_SAFE {
     return 0;
 }
 
-static inline IData VL_MOSTSETBITP1_W(int words, WDataInP lwp) VL_MT_SAFE {
+static inline IData VL_MOSTSETBITP1_W(int words, WDataInP const lwp) VL_MT_SAFE {
     // MSB set bit plus one; similar to FLS.  0=value is zero
     for (int i = words - 1; i >= 0; --i) {
         if (VL_UNLIKELY(lwp[i])) {  // Shorter worst case if predict not taken
@@ -1660,28 +1660,31 @@ static inline IData VL_MOSTSETBITP1_W(int words, WDataInP lwp) VL_MT_SAFE {
 // SIMPLE LOGICAL OPERATORS
 
 // EMIT_RULE: VL_AND:  oclean=lclean||rclean; obits=lbits; lbits==rbits;
-static inline WDataOutP VL_AND_W(int words, WDataOutP owp, WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
+static inline WDataOutP VL_AND_W(int words, WDataOutP owp, WDataInP const lwp,
+                                 WDataInP const rwp) VL_MT_SAFE {
     for (int i = 0; (i < words); ++i) owp[i] = (lwp[i] & rwp[i]);
     return owp;
 }
 // EMIT_RULE: VL_OR:   oclean=lclean&&rclean; obits=lbits; lbits==rbits;
-static inline WDataOutP VL_OR_W(int words, WDataOutP owp, WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
+static inline WDataOutP VL_OR_W(int words, WDataOutP owp, WDataInP const lwp,
+                                WDataInP const rwp) VL_MT_SAFE {
     for (int i = 0; (i < words); ++i) owp[i] = (lwp[i] | rwp[i]);
     return owp;
 }
 // EMIT_RULE: VL_CHANGEXOR:  oclean=1; obits=32; lbits==rbits;
-static inline IData VL_CHANGEXOR_W(int words, WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
+static inline IData VL_CHANGEXOR_W(int words, WDataInP const lwp, WDataInP const rwp) VL_MT_SAFE {
     IData od = 0;
     for (int i = 0; (i < words); ++i) od |= (lwp[i] ^ rwp[i]);
     return od;
 }
 // EMIT_RULE: VL_XOR:  oclean=lclean&&rclean; obits=lbits; lbits==rbits;
-static inline WDataOutP VL_XOR_W(int words, WDataOutP owp, WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
+static inline WDataOutP VL_XOR_W(int words, WDataOutP owp, WDataInP const lwp,
+                                 WDataInP const rwp) VL_MT_SAFE {
     for (int i = 0; (i < words); ++i) owp[i] = (lwp[i] ^ rwp[i]);
     return owp;
 }
 // EMIT_RULE: VL_NOT:  oclean=dirty; obits=lbits;
-static inline WDataOutP VL_NOT_W(int words, WDataOutP owp, WDataInP lwp) VL_MT_SAFE {
+static inline WDataOutP VL_NOT_W(int words, WDataOutP owp, WDataInP const lwp) VL_MT_SAFE {
     for (int i = 0; i < words; ++i) owp[i] = ~(lwp[i]);
     return owp;
 }
@@ -1702,14 +1705,14 @@ static inline WDataOutP VL_NOT_W(int words, WDataOutP owp, WDataInP lwp) VL_MT_S
 #define VL_GTE_W(words, lwp, rwp) (_vl_cmp_w(words, lwp, rwp) >= 0)
 
 // Output clean, <lhs> AND <rhs> MUST BE CLEAN
-static inline IData VL_EQ_W(int words, WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
+static inline IData VL_EQ_W(int words, WDataInP const lwp, WDataInP const rwp) VL_MT_SAFE {
     EData nequal = 0;
     for (int i = 0; (i < words); ++i) nequal |= (lwp[i] ^ rwp[i]);
     return (nequal == 0);
 }
 
 // Internal usage
-static inline int _vl_cmp_w(int words, WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
+static inline int _vl_cmp_w(int words, WDataInP const lwp, WDataInP const rwp) VL_MT_SAFE {
     for (int i = words - 1; i >= 0; --i) {
         if (lwp[i] > rwp[i]) return 1;
         if (lwp[i] < rwp[i]) return -1;
@@ -1725,55 +1728,55 @@ static inline int _vl_cmp_w(int words, WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
 static inline IData VL_GTS_III(int, int lbits, int, IData lhs, IData rhs) VL_PURE {
     // For lbits==32, this becomes just a single instruction, otherwise ~5.
     // GCC 3.3.4 sign extension bugs on AMD64 architecture force us to use quad logic
-    vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);  // Q for gcc
-    vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);  // Q for gcc
+    const vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);  // Q for gcc
+    const vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);  // Q for gcc
     return lhs_signed > rhs_signed;
 }
 static inline IData VL_GTS_IQQ(int, int lbits, int, QData lhs, QData rhs) VL_PURE {
-    vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);
-    vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);
+    const vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);
+    const vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);
     return lhs_signed > rhs_signed;
 }
 
 static inline IData VL_GTES_III(int, int lbits, int, IData lhs, IData rhs) VL_PURE {
-    vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);  // Q for gcc
-    vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);  // Q for gcc
+    const vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);  // Q for gcc
+    const vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);  // Q for gcc
     return lhs_signed >= rhs_signed;
 }
 static inline IData VL_GTES_IQQ(int, int lbits, int, QData lhs, QData rhs) VL_PURE {
-    vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);
-    vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);
+    const vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);
+    const vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);
     return lhs_signed >= rhs_signed;
 }
 
 static inline IData VL_LTS_III(int, int lbits, int, IData lhs, IData rhs) VL_PURE {
-    vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);  // Q for gcc
-    vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);  // Q for gcc
+    const vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);  // Q for gcc
+    const vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);  // Q for gcc
     return lhs_signed < rhs_signed;
 }
 static inline IData VL_LTS_IQQ(int, int lbits, int, QData lhs, QData rhs) VL_PURE {
-    vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);
-    vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);
+    const vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);
+    const vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);
     return lhs_signed < rhs_signed;
 }
 
 static inline IData VL_LTES_III(int, int lbits, int, IData lhs, IData rhs) VL_PURE {
-    vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);  // Q for gcc
-    vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);  // Q for gcc
+    const vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);  // Q for gcc
+    const vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);  // Q for gcc
     return lhs_signed <= rhs_signed;
 }
 static inline IData VL_LTES_IQQ(int, int lbits, int, QData lhs, QData rhs) VL_PURE {
-    vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);
-    vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);
+    const vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);
+    const vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);
     return lhs_signed <= rhs_signed;
 }
 
-static inline int _vl_cmps_w(int lbits, WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
-    int words = VL_WORDS_I(lbits);
+static inline int _vl_cmps_w(int lbits, WDataInP const lwp, WDataInP const rwp) VL_MT_SAFE {
+    const int words = VL_WORDS_I(lbits);
     int i = words - 1;
     // We need to flip sense if negative comparison
-    EData lsign = VL_SIGN_E(lbits, lwp[i]);
-    EData rsign = VL_SIGN_E(lbits, rwp[i]);
+    const EData lsign = VL_SIGN_E(lbits, lwp[i]);
+    const EData rsign = VL_SIGN_E(lbits, rwp[i]);
     if (!lsign && rsign) return 1;  // + > -
     if (lsign && !rsign) return -1;  // - < +
     for (; i >= 0; --i) {
@@ -1787,7 +1790,7 @@ static inline int _vl_cmps_w(int lbits, WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
 // Math
 
 // Output NOT clean
-static inline WDataOutP VL_NEGATE_W(int words, WDataOutP owp, WDataInP lwp) VL_MT_SAFE {
+static inline WDataOutP VL_NEGATE_W(int words, WDataOutP owp, WDataInP const lwp) VL_MT_SAFE {
     EData carry = 1;
     for (int i = 0; i < words; ++i) {
         owp[i] = ~lwp[i] + carry;
@@ -1814,7 +1817,8 @@ static inline void VL_NEGATE_INPLACE_W(int words, WDataOutP owp_lwp) VL_MT_SAFE
 #define VL_MODDIV_QQQ(lbits, lhs, rhs) (((rhs) == 0) ? 0 : (lhs) % (rhs))
 #define VL_MODDIV_WWW(lbits, owp, lwp, rwp) (_vl_moddiv_w(lbits, owp, lwp, rwp, 1))
 
-static inline WDataOutP VL_ADD_W(int words, WDataOutP owp, WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
+static inline WDataOutP VL_ADD_W(int words, WDataOutP owp, WDataInP const lwp,
+                                 WDataInP const rwp) VL_MT_SAFE {
     QData carry = 0;
     for (int i = 0; i < words; ++i) {
         carry = carry + static_cast<QData>(lwp[i]) + static_cast<QData>(rwp[i]);
@@ -1825,7 +1829,8 @@ static inline WDataOutP VL_ADD_W(int words, WDataOutP owp, WDataInP lwp, WDataIn
     return owp;
 }
 
-static inline WDataOutP VL_SUB_W(int words, WDataOutP owp, WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
+static inline WDataOutP VL_SUB_W(int words, WDataOutP owp, WDataInP const lwp,
+                                 WDataInP const rwp) VL_MT_SAFE {
     QData carry = 0;
     for (int i = 0; i < words; ++i) {
         carry = (carry + static_cast<QData>(lwp[i])
@@ -1838,7 +1843,8 @@ static inline WDataOutP VL_SUB_W(int words, WDataOutP owp, WDataInP lwp, WDataIn
     return owp;
 }
 
-static inline WDataOutP VL_MUL_W(int words, WDataOutP owp, WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
+static inline WDataOutP VL_MUL_W(int words, WDataOutP owp, WDataInP const lwp,
+                                 WDataInP const rwp) VL_MT_SAFE {
     for (int i = 0; i < words; ++i) owp[i] = 0;
     for (int lword = 0; lword < words; ++lword) {
         for (int rword = 0; rword < words; ++rword) {
@@ -1855,19 +1861,19 @@ static inline WDataOutP VL_MUL_W(int words, WDataOutP owp, WDataInP lwp, WDataIn
 }
 
 static inline IData VL_MULS_III(int, int lbits, int, IData lhs, IData rhs) VL_PURE {
-    vlsint32_t lhs_signed = VL_EXTENDS_II(32, lbits, lhs);
-    vlsint32_t rhs_signed = VL_EXTENDS_II(32, lbits, rhs);
+    const vlsint32_t lhs_signed = VL_EXTENDS_II(32, lbits, lhs);
+    const vlsint32_t rhs_signed = VL_EXTENDS_II(32, lbits, rhs);
     return lhs_signed * rhs_signed;
 }
 static inline QData VL_MULS_QQQ(int, int lbits, int, QData lhs, QData rhs) VL_PURE {
-    vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);
-    vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);
+    const vlsint64_t lhs_signed = VL_EXTENDS_QQ(64, lbits, lhs);
+    const vlsint64_t rhs_signed = VL_EXTENDS_QQ(64, lbits, rhs);
     return lhs_signed * rhs_signed;
 }
 
-static inline WDataOutP VL_MULS_WWW(int, int lbits, int, WDataOutP owp, WDataInP lwp,
-                                    WDataInP rwp) VL_MT_SAFE {
-    int words = VL_WORDS_I(lbits);
+static inline WDataOutP VL_MULS_WWW(int, int lbits, int, WDataOutP owp, WDataInP const lwp,
+                                    WDataInP const rwp) VL_MT_SAFE {
+    const int words = VL_WORDS_I(lbits);
     // cppcheck-suppress variableScope
     WData lwstore[VL_MULS_MAX_WORDS];  // Fixed size, as MSVC++ doesn't allow [words] here
     // cppcheck-suppress variableScope
@@ -1907,38 +1913,38 @@ static inline IData VL_DIVS_III(int lbits, IData lhs, IData rhs) VL_PURE {
     if (VL_UNLIKELY(rhs == 0)) return 0;
     // -MAX / -1 cannot be represented in twos complement, and will cause SIGFPE
     if (VL_UNLIKELY(lhs == 0x80000000 && rhs == 0xffffffff)) return 0;
-    vlsint32_t lhs_signed = VL_EXTENDS_II(VL_IDATASIZE, lbits, lhs);
-    vlsint32_t rhs_signed = VL_EXTENDS_II(VL_IDATASIZE, lbits, rhs);
+    const vlsint32_t lhs_signed = VL_EXTENDS_II(VL_IDATASIZE, lbits, lhs);
+    const vlsint32_t rhs_signed = VL_EXTENDS_II(VL_IDATASIZE, lbits, rhs);
     return lhs_signed / rhs_signed;
 }
 static inline QData VL_DIVS_QQQ(int lbits, QData lhs, QData rhs) VL_PURE {
     if (VL_UNLIKELY(rhs == 0)) return 0;
     // -MAX / -1 cannot be represented in twos complement, and will cause SIGFPE
     if (VL_UNLIKELY(lhs == 0x8000000000000000ULL && rhs == 0xffffffffffffffffULL)) return 0;
-    vlsint64_t lhs_signed = VL_EXTENDS_QQ(VL_QUADSIZE, lbits, lhs);
-    vlsint64_t rhs_signed = VL_EXTENDS_QQ(VL_QUADSIZE, lbits, rhs);
+    const vlsint64_t lhs_signed = VL_EXTENDS_QQ(VL_QUADSIZE, lbits, lhs);
+    const vlsint64_t rhs_signed = VL_EXTENDS_QQ(VL_QUADSIZE, lbits, rhs);
     return lhs_signed / rhs_signed;
 }
 static inline IData VL_MODDIVS_III(int lbits, IData lhs, IData rhs) VL_PURE {
     if (VL_UNLIKELY(rhs == 0)) return 0;
     if (VL_UNLIKELY(lhs == 0x80000000 && rhs == 0xffffffff)) return 0;
-    vlsint32_t lhs_signed = VL_EXTENDS_II(VL_IDATASIZE, lbits, lhs);
-    vlsint32_t rhs_signed = VL_EXTENDS_II(VL_IDATASIZE, lbits, rhs);
+    const vlsint32_t lhs_signed = VL_EXTENDS_II(VL_IDATASIZE, lbits, lhs);
+    const vlsint32_t rhs_signed = VL_EXTENDS_II(VL_IDATASIZE, lbits, rhs);
     return lhs_signed % rhs_signed;
 }
 static inline QData VL_MODDIVS_QQQ(int lbits, QData lhs, QData rhs) VL_PURE {
     if (VL_UNLIKELY(rhs == 0)) return 0;
     if (VL_UNLIKELY(lhs == 0x8000000000000000ULL && rhs == 0xffffffffffffffffULL)) return 0;
-    vlsint64_t lhs_signed = VL_EXTENDS_QQ(VL_QUADSIZE, lbits, lhs);
-    vlsint64_t rhs_signed = VL_EXTENDS_QQ(VL_QUADSIZE, lbits, rhs);
+    const vlsint64_t lhs_signed = VL_EXTENDS_QQ(VL_QUADSIZE, lbits, lhs);
+    const vlsint64_t rhs_signed = VL_EXTENDS_QQ(VL_QUADSIZE, lbits, rhs);
     return lhs_signed % rhs_signed;
 }
 
-static inline WDataOutP VL_DIVS_WWW(int lbits, WDataOutP owp, WDataInP lwp,
-                                    WDataInP rwp) VL_MT_SAFE {
-    int words = VL_WORDS_I(lbits);
-    EData lsign = VL_SIGN_E(lbits, lwp[words - 1]);
-    EData rsign = VL_SIGN_E(lbits, rwp[words - 1]);
+static inline WDataOutP VL_DIVS_WWW(int lbits, WDataOutP owp, WDataInP const lwp,
+                                    WDataInP const rwp) VL_MT_SAFE {
+    const int words = VL_WORDS_I(lbits);
+    const EData lsign = VL_SIGN_E(lbits, lwp[words - 1]);
+    const EData rsign = VL_SIGN_E(lbits, rwp[words - 1]);
     // cppcheck-suppress variableScope
     WData lwstore[VL_MULS_MAX_WORDS];  // Fixed size, as MSVC++ doesn't allow [words] here
     // cppcheck-suppress variableScope
@@ -1956,11 +1962,11 @@ static inline WDataOutP VL_DIVS_WWW(int lbits, WDataOutP owp, WDataInP lwp,
         return VL_DIV_WWW(lbits, owp, ltup, rtup);
     }
 }
-static inline WDataOutP VL_MODDIVS_WWW(int lbits, WDataOutP owp, WDataInP lwp,
-                                       WDataInP rwp) VL_MT_SAFE {
-    int words = VL_WORDS_I(lbits);
-    EData lsign = VL_SIGN_E(lbits, lwp[words - 1]);
-    EData rsign = VL_SIGN_E(lbits, rwp[words - 1]);
+static inline WDataOutP VL_MODDIVS_WWW(int lbits, WDataOutP owp, WDataInP const lwp,
+                                       WDataInP const rwp) VL_MT_SAFE {
+    const int words = VL_WORDS_I(lbits);
+    const EData lsign = VL_SIGN_E(lbits, lwp[words - 1]);
+    const EData rsign = VL_SIGN_E(lbits, rwp[words - 1]);
     // cppcheck-suppress variableScope
     WData lwstore[VL_MULS_MAX_WORDS];  // Fixed size, as MSVC++ doesn't allow [words] here
     // cppcheck-suppress variableScope
@@ -2007,9 +2013,10 @@ static inline QData VL_POW_QQQ(int, int, int rbits, QData lhs, QData rhs) VL_PUR
     }
     return out;
 }
-WDataOutP VL_POW_WWW(int obits, int, int rbits, WDataOutP owp, WDataInP lwp, WDataInP rwp);
-WDataOutP VL_POW_WWQ(int obits, int, int rbits, WDataOutP owp, WDataInP lwp, QData rhs);
-QData VL_POW_QQW(int obits, int, int rbits, QData lhs, WDataInP rwp);
+WDataOutP VL_POW_WWW(int obits, int, int rbits, WDataOutP owp, WDataInP const lwp,
+                     WDataInP const rwp);
+WDataOutP VL_POW_WWQ(int obits, int, int rbits, WDataOutP owp, WDataInP const lwp, QData rhs);
+QData VL_POW_QQW(int obits, int, int rbits, QData lhs, WDataInP const rwp);
 
 #define VL_POWSS_IIQ(obits, lbits, rbits, lhs, rhs, lsign, rsign) \
     VL_POWSS_QQQ(obits, lbits, rbits, lhs, rhs, lsign, rsign)
@@ -2060,11 +2067,12 @@ static inline QData VL_POWSS_QQQ(int obits, int, int rbits, QData lhs, QData rhs
     }
     return VL_POW_QQQ(obits, rbits, rbits, lhs, rhs);
 }
-WDataOutP VL_POWSS_WWW(int obits, int, int rbits, WDataOutP owp, WDataInP lwp, WDataInP rwp,
+WDataOutP VL_POWSS_WWW(int obits, int, int rbits, WDataOutP owp, WDataInP const lwp,
+                       WDataInP const rwp, bool lsign, bool rsign);
+WDataOutP VL_POWSS_WWQ(int obits, int, int rbits, WDataOutP owp, WDataInP const lwp, QData rhs,
                        bool lsign, bool rsign);
-WDataOutP VL_POWSS_WWQ(int obits, int, int rbits, WDataOutP owp, WDataInP lwp, QData rhs,
-                       bool lsign, bool rsign);
-QData VL_POWSS_QQW(int obits, int, int rbits, QData lhs, WDataInP rwp, bool lsign, bool rsign);
+QData VL_POWSS_QQW(int obits, int, int rbits, QData lhs, WDataInP const rwp, bool lsign,
+                   bool rsign);
 
 //===================================================================
 // Concat/replication
@@ -2073,52 +2081,52 @@ QData VL_POWSS_QQW(int obits, int, int rbits, QData lhs, WDataInP rwp, bool lsig
 // ld may be "dirty", output is clean
 static inline void _vl_insert_II(int, CData& lhsr, IData ld, int hbit, int lbit,
                                  int rbits) VL_PURE {
-    IData cleanmask = VL_MASK_I(rbits);
-    IData insmask = (VL_MASK_I(hbit - lbit + 1)) << lbit;
+    const IData cleanmask = VL_MASK_I(rbits);
+    const IData insmask = (VL_MASK_I(hbit - lbit + 1)) << lbit;
     lhsr = (lhsr & ~insmask) | ((ld << lbit) & (insmask & cleanmask));
 }
 static inline void _vl_insert_II(int, SData& lhsr, IData ld, int hbit, int lbit,
                                  int rbits) VL_PURE {
-    IData cleanmask = VL_MASK_I(rbits);
-    IData insmask = (VL_MASK_I(hbit - lbit + 1)) << lbit;
+    const IData cleanmask = VL_MASK_I(rbits);
+    const IData insmask = (VL_MASK_I(hbit - lbit + 1)) << lbit;
     lhsr = (lhsr & ~insmask) | ((ld << lbit) & (insmask & cleanmask));
 }
 static inline void _vl_insert_II(int, IData& lhsr, IData ld, int hbit, int lbit,
                                  int rbits) VL_PURE {
-    IData cleanmask = VL_MASK_I(rbits);
-    IData insmask = (VL_MASK_I(hbit - lbit + 1)) << lbit;
+    const IData cleanmask = VL_MASK_I(rbits);
+    const IData insmask = (VL_MASK_I(hbit - lbit + 1)) << lbit;
     lhsr = (lhsr & ~insmask) | ((ld << lbit) & (insmask & cleanmask));
 }
 static inline void _vl_insert_QQ(int, QData& lhsr, QData ld, int hbit, int lbit,
                                  int rbits) VL_PURE {
-    QData cleanmask = VL_MASK_Q(rbits);
-    QData insmask = (VL_MASK_Q(hbit - lbit + 1)) << lbit;
+    const QData cleanmask = VL_MASK_Q(rbits);
+    const QData insmask = (VL_MASK_Q(hbit - lbit + 1)) << lbit;
     lhsr = (lhsr & ~insmask) | ((ld << lbit) & (insmask & cleanmask));
 }
 static inline void _vl_insert_WI(int, WDataOutP owp, IData ld, int hbit, int lbit,
                                  int rbits = 0) VL_MT_SAFE {
-    int hoffset = VL_BITBIT_E(hbit);
-    int loffset = VL_BITBIT_E(lbit);
-    int roffset = VL_BITBIT_E(rbits);
-    int hword = VL_BITWORD_E(hbit);
-    int lword = VL_BITWORD_E(lbit);
-    int rword = VL_BITWORD_E(rbits);
-    EData cleanmask = hword == rword ? VL_MASK_E(roffset) : VL_MASK_E(0);
+    const int hoffset = VL_BITBIT_E(hbit);
+    const int loffset = VL_BITBIT_E(lbit);
+    const int roffset = VL_BITBIT_E(rbits);
+    const int hword = VL_BITWORD_E(hbit);
+    const int lword = VL_BITWORD_E(lbit);
+    const int rword = VL_BITWORD_E(rbits);
+    const EData cleanmask = hword == rword ? VL_MASK_E(roffset) : VL_MASK_E(0);
 
     if (hoffset == VL_SIZEBITS_E && loffset == 0) {
         // Fast and common case, word based insertion
         owp[VL_BITWORD_E(lbit)] = ld & cleanmask;
     } else {
-        EData lde = static_cast<EData>(ld);
+        const EData lde = static_cast<EData>(ld);
         if (hword == lword) {  // know < EData bits because above checks it
             // Assignment is contained within one word of destination
-            EData insmask = (VL_MASK_E(hoffset - loffset + 1)) << loffset;
+            const EData insmask = (VL_MASK_E(hoffset - loffset + 1)) << loffset;
             owp[lword] = (owp[lword] & ~insmask) | ((lde << loffset) & (insmask & cleanmask));
         } else {
             // Assignment crosses a word boundary in destination
-            EData hinsmask = (VL_MASK_E(hoffset - 0 + 1)) << 0;
-            EData linsmask = (VL_MASK_E((VL_EDATASIZE - 1) - loffset + 1)) << loffset;
-            int nbitsonright = VL_EDATASIZE - loffset;  // bits that end up in lword
+            const EData hinsmask = (VL_MASK_E(hoffset - 0 + 1)) << 0;
+            const EData linsmask = (VL_MASK_E((VL_EDATASIZE - 1) - loffset + 1)) << loffset;
+            const int nbitsonright = VL_EDATASIZE - loffset;  // bits that end up in lword
             owp[lword] = (owp[lword] & ~linsmask) | ((lde << loffset) & linsmask);
             owp[hword]
                 = (owp[hword] & ~hinsmask) | ((lde >> nbitsonright) & (hinsmask & cleanmask));
@@ -2128,18 +2136,18 @@ static inline void _vl_insert_WI(int, WDataOutP owp, IData ld, int hbit, int lbi
 
 // INTERNAL: Stuff large LHS bit 0++ into OUTPUT at specified offset
 // lwp may be "dirty"
-static inline void _vl_insert_WW(int, WDataOutP owp, WDataInP lwp, int hbit, int lbit,
+static inline void _vl_insert_WW(int, WDataOutP owp, WDataInP const lwp, int hbit, int lbit,
                                  int rbits = 0) VL_MT_SAFE {
-    int hoffset = VL_BITBIT_E(hbit);
-    int loffset = VL_BITBIT_E(lbit);
-    int roffset = VL_BITBIT_E(rbits);
-    int lword = VL_BITWORD_E(lbit);
-    int hword = VL_BITWORD_E(hbit);
-    int rword = VL_BITWORD_E(rbits);
-    int words = VL_WORDS_I(hbit - lbit + 1);
+    const int hoffset = VL_BITBIT_E(hbit);
+    const int loffset = VL_BITBIT_E(lbit);
+    const int roffset = VL_BITBIT_E(rbits);
+    const int lword = VL_BITWORD_E(lbit);
+    const int hword = VL_BITWORD_E(hbit);
+    const int rword = VL_BITWORD_E(rbits);
+    const int words = VL_WORDS_I(hbit - lbit + 1);
     // Cleaning mask, only applied to top word of the assignment.  Is a no-op
     // if we don't assign to the top word of the destination.
-    EData cleanmask = hword == rword ? VL_MASK_E(roffset) : VL_MASK_E(0);
+    const EData cleanmask = hword == rword ? VL_MASK_E(roffset) : VL_MASK_E(0);
 
     if (hoffset == VL_SIZEBITS_E && loffset == 0) {
         // Fast and common case, word based insertion
@@ -2149,18 +2157,19 @@ static inline void _vl_insert_WW(int, WDataOutP owp, WDataInP lwp, int hbit, int
         // Non-32bit, but nicely aligned, so stuff all but the last word
         for (int i = 0; i < (words - 1); ++i) owp[lword + i] = lwp[i];
         // Know it's not a full word as above fast case handled it
-        EData hinsmask = (VL_MASK_E(hoffset - 0 + 1));
+        const EData hinsmask = (VL_MASK_E(hoffset - 0 + 1));
         owp[hword] = (owp[hword] & ~hinsmask) | (lwp[words - 1] & (hinsmask & cleanmask));
     } else {
-        EData hinsmask = (VL_MASK_E(hoffset - 0 + 1)) << 0;
-        EData linsmask = (VL_MASK_E((VL_EDATASIZE - 1) - loffset + 1)) << loffset;
-        int nbitsonright = VL_EDATASIZE - loffset;  // bits that end up in lword (know loffset!=0)
+        const EData hinsmask = (VL_MASK_E(hoffset - 0 + 1)) << 0;
+        const EData linsmask = (VL_MASK_E((VL_EDATASIZE - 1) - loffset + 1)) << loffset;
+        const int nbitsonright
+            = VL_EDATASIZE - loffset;  // bits that end up in lword (know loffset!=0)
         // Middle words
         for (int i = 0; i < words; ++i) {
             {  // Lower word
-                int oword = lword + i;
-                EData d = lwp[i] << loffset;
-                EData od = (owp[oword] & ~linsmask) | (d & linsmask);
+                const int oword = lword + i;
+                const EData d = lwp[i] << loffset;
+                const EData od = (owp[oword] & ~linsmask) | (d & linsmask);
                 if (oword == hword) {
                     owp[oword] = (owp[oword] & ~hinsmask) | (od & (hinsmask & cleanmask));
                 } else {
@@ -2168,10 +2177,10 @@ static inline void _vl_insert_WW(int, WDataOutP owp, WDataInP lwp, int hbit, int
                 }
             }
             {  // Upper word
-                int oword = lword + i + 1;
+                const int oword = lword + i + 1;
                 if (oword <= hword) {
-                    EData d = lwp[i] >> nbitsonright;
-                    EData od = (d & ~linsmask) | (owp[oword] & linsmask);
+                    const EData d = lwp[i] >> nbitsonright;
+                    const EData od = (d & ~linsmask) | (owp[oword] & linsmask);
                     if (oword == hword) {
                         owp[oword] = (owp[oword] & ~hinsmask) | (od & (hinsmask & cleanmask));
                     } else {
@@ -2227,8 +2236,8 @@ static inline WDataOutP VL_REPLICATE_WQI(int obits, int lbits, int, WDataOutP ow
     }
     return owp;
 }
-static inline WDataOutP VL_REPLICATE_WWI(int obits, int lbits, int, WDataOutP owp, WDataInP lwp,
-                                         IData rep) VL_MT_SAFE {
+static inline WDataOutP VL_REPLICATE_WWI(int obits, int lbits, int, WDataOutP owp,
+                                         WDataInP const lwp, IData rep) VL_MT_SAFE {
     for (int i = 0; i < VL_WORDS_I(lbits); ++i) owp[i] = lwp[i];
     for (unsigned i = 1; i < rep; ++i) {
         _vl_insert_WW(obits, owp, lwp, i * lbits + lbits - 1, i * lbits);
@@ -2262,9 +2271,9 @@ static inline IData VL_STREAML_FAST_III(int, int lbits, int, IData ld, IData rd_
     //   ret = 10324---
     IData ret = ld;
     if (rd_log2) {
-        vluint32_t lbitsFloor = lbits & ~VL_MASK_I(rd_log2);  // max multiple of rd <= lbits
-        vluint32_t lbitsRem = lbits - lbitsFloor;  // number of bits in most-sig slice (MSS)
-        IData msbMask = VL_MASK_I(lbitsRem) << lbitsFloor;  // mask to sel only bits in MSS
+        const vluint32_t lbitsFloor = lbits & ~VL_MASK_I(rd_log2);  // max multiple of rd <= lbits
+        const vluint32_t lbitsRem = lbits - lbitsFloor;  // number of bits in most-sig slice (MSS)
+        const IData msbMask = VL_MASK_I(lbitsRem) << lbitsFloor;  // mask to sel only bits in MSS
         ret = (ret & ~msbMask) | ((ret & msbMask) << ((VL_UL(1) << rd_log2) - lbitsRem));
     }
     switch (rd_log2) {
@@ -2282,9 +2291,9 @@ static inline QData VL_STREAML_FAST_QQI(int, int lbits, int, QData ld, IData rd_
     // Pre-shift bits in most-significant slice (see comment in VL_STREAML_FAST_III)
     QData ret = ld;
     if (rd_log2) {
-        vluint32_t lbitsFloor = lbits & ~VL_MASK_I(rd_log2);
-        vluint32_t lbitsRem = lbits - lbitsFloor;
-        QData msbMask = VL_MASK_Q(lbitsRem) << lbitsFloor;
+        const vluint32_t lbitsFloor = lbits & ~VL_MASK_I(rd_log2);
+        const vluint32_t lbitsRem = lbits - lbitsFloor;
+        const QData msbMask = VL_MASK_Q(lbitsRem) << lbitsFloor;
         ret = (ret & ~msbMask) | ((ret & msbMask) << ((1ULL << rd_log2) - lbitsRem));
     }
     switch (rd_log2) {
@@ -2313,7 +2322,7 @@ static inline QData VL_STREAML_FAST_QQI(int, int lbits, int, QData ld, IData rd_
 static inline IData VL_STREAML_III(int, int lbits, int, IData ld, IData rd) VL_PURE {
     IData ret = 0;
     // Slice size should never exceed the lhs width
-    IData mask = VL_MASK_I(rd);
+    const IData mask = VL_MASK_I(rd);
     for (int istart = 0; istart < lbits; istart += rd) {
         int ostart = lbits - rd - istart;
         ostart = ostart > 0 ? ostart : 0;
@@ -2325,7 +2334,7 @@ static inline IData VL_STREAML_III(int, int lbits, int, IData ld, IData rd) VL_P
 static inline QData VL_STREAML_QQI(int, int lbits, int, QData ld, IData rd) VL_PURE {
     QData ret = 0;
     // Slice size should never exceed the lhs width
-    QData mask = VL_MASK_Q(rd);
+    const QData mask = VL_MASK_Q(rd);
     for (int istart = 0; istart < lbits; istart += rd) {
         int ostart = lbits - rd - istart;
         ostart = ostart > 0 ? ostart : 0;
@@ -2334,11 +2343,11 @@ static inline QData VL_STREAML_QQI(int, int lbits, int, QData ld, IData rd) VL_P
     return ret;
 }
 
-static inline WDataOutP VL_STREAML_WWI(int, int lbits, int, WDataOutP owp, WDataInP lwp,
+static inline WDataOutP VL_STREAML_WWI(int, int lbits, int, WDataOutP owp, WDataInP const lwp,
                                        IData rd) VL_MT_SAFE {
     VL_ZERO_W(lbits, owp);
     // Slice size should never exceed the lhs width
-    int ssize = (rd < static_cast<IData>(lbits)) ? rd : (static_cast<IData>(lbits));
+    const int ssize = (rd < static_cast<IData>(lbits)) ? rd : (static_cast<IData>(lbits));
     for (int istart = 0; istart < lbits; istart += rd) {
         int ostart = lbits - rd - istart;
         ostart = ostart > 0 ? ostart : 0;
@@ -2374,15 +2383,15 @@ static inline WDataOutP VL_CONCAT_WII(int obits, int lbits, int rbits, WDataOutP
     _vl_insert_WI(obits, owp, ld, rbits + lbits - 1, rbits);
     return owp;
 }
-static inline WDataOutP VL_CONCAT_WWI(int obits, int lbits, int rbits, WDataOutP owp, WDataInP lwp,
-                                      IData rd) VL_MT_SAFE {
+static inline WDataOutP VL_CONCAT_WWI(int obits, int lbits, int rbits, WDataOutP owp,
+                                      WDataInP const lwp, IData rd) VL_MT_SAFE {
     owp[0] = rd;
     for (int i = 1; i < VL_WORDS_I(obits); ++i) owp[i] = 0;
     _vl_insert_WW(obits, owp, lwp, rbits + lbits - 1, rbits);
     return owp;
 }
 static inline WDataOutP VL_CONCAT_WIW(int obits, int lbits, int rbits, WDataOutP owp, IData ld,
-                                      WDataInP rwp) VL_MT_SAFE {
+                                      WDataInP const rwp) VL_MT_SAFE {
     for (int i = 0; i < VL_WORDS_I(rbits); ++i) owp[i] = rwp[i];
     for (int i = VL_WORDS_I(rbits); i < VL_WORDS_I(obits); ++i) owp[i] = 0;
     _vl_insert_WI(obits, owp, ld, rbits + lbits - 1, rbits);
@@ -2409,22 +2418,22 @@ static inline WDataOutP VL_CONCAT_WQQ(int obits, int lbits, int rbits, WDataOutP
     _vl_insert_WQ(obits, owp, ld, rbits + lbits - 1, rbits);
     return owp;
 }
-static inline WDataOutP VL_CONCAT_WWQ(int obits, int lbits, int rbits, WDataOutP owp, WDataInP lwp,
-                                      QData rd) VL_MT_SAFE {
+static inline WDataOutP VL_CONCAT_WWQ(int obits, int lbits, int rbits, WDataOutP owp,
+                                      WDataInP const lwp, QData rd) VL_MT_SAFE {
     VL_SET_WQ(owp, rd);
     for (int i = VL_WQ_WORDS_E; i < VL_WORDS_I(obits); ++i) owp[i] = 0;
     _vl_insert_WW(obits, owp, lwp, rbits + lbits - 1, rbits);
     return owp;
 }
 static inline WDataOutP VL_CONCAT_WQW(int obits, int lbits, int rbits, WDataOutP owp, QData ld,
-                                      WDataInP rwp) VL_MT_SAFE {
+                                      WDataInP const rwp) VL_MT_SAFE {
     for (int i = 0; i < VL_WORDS_I(rbits); ++i) owp[i] = rwp[i];
     for (int i = VL_WORDS_I(rbits); i < VL_WORDS_I(obits); ++i) owp[i] = 0;
     _vl_insert_WQ(obits, owp, ld, rbits + lbits - 1, rbits);
     return owp;
 }
-static inline WDataOutP VL_CONCAT_WWW(int obits, int lbits, int rbits, WDataOutP owp, WDataInP lwp,
-                                      WDataInP rwp) VL_MT_SAFE {
+static inline WDataOutP VL_CONCAT_WWW(int obits, int lbits, int rbits, WDataOutP owp,
+                                      WDataInP const lwp, WDataInP const rwp) VL_MT_SAFE {
     for (int i = 0; i < VL_WORDS_I(rbits); ++i) owp[i] = rwp[i];
     for (int i = VL_WORDS_I(rbits); i < VL_WORDS_I(obits); ++i) owp[i] = 0;
     _vl_insert_WW(obits, owp, lwp, rbits + lbits - 1, rbits);
@@ -2438,8 +2447,8 @@ static inline WDataOutP VL_CONCAT_WWW(int obits, int lbits, int rbits, WDataOutP
 // The output is the same as the input - it overlaps!
 static inline void _vl_shiftl_inplace_w(int obits, WDataOutP iowp,
                                         IData rd /*1 or 4*/) VL_MT_SAFE {
-    int words = VL_WORDS_I(obits);
-    EData linsmask = VL_MASK_E(rd);
+    const int words = VL_WORDS_I(obits);
+    const EData linsmask = VL_MASK_E(rd);
     for (int i = words - 1; i >= 1; --i) {
         iowp[i]
             = ((iowp[i] << rd) & ~linsmask) | ((iowp[i - 1] >> (VL_EDATASIZE - rd)) & linsmask);
@@ -2451,10 +2460,10 @@ static inline void _vl_shiftl_inplace_w(int obits, WDataOutP iowp,
 // EMIT_RULE: VL_SHIFTL:  oclean=lclean; rclean==clean;
 // Important: Unlike most other funcs, the shift might well be a computed
 // expression.  Thus consider this when optimizing.  (And perhaps have 2 funcs?)
-static inline WDataOutP VL_SHIFTL_WWI(int obits, int, int, WDataOutP owp, WDataInP lwp,
+static inline WDataOutP VL_SHIFTL_WWI(int obits, int, int, WDataOutP owp, WDataInP const lwp,
                                       IData rd) VL_MT_SAFE {
-    int word_shift = VL_BITWORD_E(rd);
-    int bit_shift = VL_BITBIT_E(rd);
+    const int word_shift = VL_BITWORD_E(rd);
+    const int bit_shift = VL_BITBIT_E(rd);
     if (rd >= static_cast<IData>(obits)) {  // rd may be huge with MSB set
         for (int i = 0; i < VL_WORDS_I(obits); ++i) owp[i] = 0;
     } else if (bit_shift == 0) {  // Aligned word shift (<<0,<<32,<<64 etc)
@@ -2466,8 +2475,8 @@ static inline WDataOutP VL_SHIFTL_WWI(int obits, int, int, WDataOutP owp, WDataI
     }
     return owp;
 }
-static inline WDataOutP VL_SHIFTL_WWW(int obits, int lbits, int rbits, WDataOutP owp, WDataInP lwp,
-                                      WDataInP rwp) VL_MT_SAFE {
+static inline WDataOutP VL_SHIFTL_WWW(int obits, int lbits, int rbits, WDataOutP owp,
+                                      WDataInP const lwp, WDataInP const rwp) VL_MT_SAFE {
     for (int i = 1; i < VL_WORDS_I(rbits); ++i) {
         if (VL_UNLIKELY(rwp[i])) {  // Huge shift 1>>32 or more
             return VL_ZERO_W(obits, owp);
@@ -2475,13 +2484,14 @@ static inline WDataOutP VL_SHIFTL_WWW(int obits, int lbits, int rbits, WDataOutP
     }
     return VL_SHIFTL_WWI(obits, lbits, 32, owp, lwp, rwp[0]);
 }
-static inline WDataOutP VL_SHIFTL_WWQ(int obits, int lbits, int rbits, WDataOutP owp, WDataInP lwp,
-                                      QData rd) VL_MT_SAFE {
+static inline WDataOutP VL_SHIFTL_WWQ(int obits, int lbits, int rbits, WDataOutP owp,
+                                      WDataInP const lwp, QData rd) VL_MT_SAFE {
     WData rwp[VL_WQ_WORDS_E];
     VL_SET_WQ(rwp, rd);
     return VL_SHIFTL_WWW(obits, lbits, rbits, owp, lwp, rwp);
 }
-static inline IData VL_SHIFTL_IIW(int obits, int, int rbits, IData lhs, WDataInP rwp) VL_MT_SAFE {
+static inline IData VL_SHIFTL_IIW(int obits, int, int rbits, IData lhs,
+                                  WDataInP const rwp) VL_MT_SAFE {
     for (int i = 1; i < VL_WORDS_I(rbits); ++i) {
         if (VL_UNLIKELY(rwp[i])) {  // Huge shift 1>>32 or more
             return 0;
@@ -2493,7 +2503,8 @@ static inline IData VL_SHIFTL_IIQ(int obits, int, int, IData lhs, QData rhs) VL_
     if (VL_UNLIKELY(rhs >= VL_IDATASIZE)) return 0;
     return VL_CLEAN_II(obits, obits, lhs << rhs);
 }
-static inline QData VL_SHIFTL_QQW(int obits, int, int rbits, QData lhs, WDataInP rwp) VL_MT_SAFE {
+static inline QData VL_SHIFTL_QQW(int obits, int, int rbits, QData lhs,
+                                  WDataInP const rwp) VL_MT_SAFE {
     for (int i = 1; i < VL_WORDS_I(rbits); ++i) {
         if (VL_UNLIKELY(rwp[i])) {  // Huge shift 1>>32 or more
             return 0;
@@ -2510,32 +2521,32 @@ static inline QData VL_SHIFTL_QQQ(int obits, int, int, QData lhs, QData rhs) VL_
 // EMIT_RULE: VL_SHIFTR:  oclean=lclean; rclean==clean;
 // Important: Unlike most other funcs, the shift might well be a computed
 // expression.  Thus consider this when optimizing.  (And perhaps have 2 funcs?)
-static inline WDataOutP VL_SHIFTR_WWI(int obits, int, int, WDataOutP owp, WDataInP lwp,
+static inline WDataOutP VL_SHIFTR_WWI(int obits, int, int, WDataOutP owp, WDataInP const lwp,
                                       IData rd) VL_MT_SAFE {
-    int word_shift = VL_BITWORD_E(rd);  // Maybe 0
-    int bit_shift = VL_BITBIT_E(rd);
+    const int word_shift = VL_BITWORD_E(rd);  // Maybe 0
+    const int bit_shift = VL_BITBIT_E(rd);
     if (rd >= static_cast<IData>(obits)) {  // rd may be huge with MSB set
         for (int i = 0; i < VL_WORDS_I(obits); ++i) owp[i] = 0;
     } else if (bit_shift == 0) {  // Aligned word shift (>>0,>>32,>>64 etc)
-        int copy_words = (VL_WORDS_I(obits) - word_shift);
+        const int copy_words = (VL_WORDS_I(obits) - word_shift);
         for (int i = 0; i < copy_words; ++i) owp[i] = lwp[i + word_shift];
         for (int i = copy_words; i < VL_WORDS_I(obits); ++i) owp[i] = 0;
     } else {
-        int loffset = rd & VL_SIZEBITS_E;
-        int nbitsonright = VL_EDATASIZE - loffset;  // bits that end up in lword (know loffset!=0)
-        // Middle words
-        int words = VL_WORDS_I(obits - rd);
+        const int loffset = rd & VL_SIZEBITS_E;
+        const int nbitsonright = VL_EDATASIZE - loffset;  // bits that end up in lword (know
+                                                          // loffset!=0) Middle words
+        const int words = VL_WORDS_I(obits - rd);
         for (int i = 0; i < words; ++i) {
             owp[i] = lwp[i + word_shift] >> loffset;
-            int upperword = i + word_shift + 1;
+            const int upperword = i + word_shift + 1;
             if (upperword < VL_WORDS_I(obits)) owp[i] |= lwp[upperword] << nbitsonright;
         }
         for (int i = words; i < VL_WORDS_I(obits); ++i) owp[i] = 0;
     }
     return owp;
 }
-static inline WDataOutP VL_SHIFTR_WWW(int obits, int lbits, int rbits, WDataOutP owp, WDataInP lwp,
-                                      WDataInP rwp) VL_MT_SAFE {
+static inline WDataOutP VL_SHIFTR_WWW(int obits, int lbits, int rbits, WDataOutP owp,
+                                      WDataInP const lwp, WDataInP const rwp) VL_MT_SAFE {
     for (int i = 1; i < VL_WORDS_I(rbits); ++i) {
         if (VL_UNLIKELY(rwp[i])) {  // Huge shift 1>>32 or more
             return VL_ZERO_W(obits, owp);
@@ -2543,14 +2554,15 @@ static inline WDataOutP VL_SHIFTR_WWW(int obits, int lbits, int rbits, WDataOutP
     }
     return VL_SHIFTR_WWI(obits, lbits, 32, owp, lwp, rwp[0]);
 }
-static inline WDataOutP VL_SHIFTR_WWQ(int obits, int lbits, int rbits, WDataOutP owp, WDataInP lwp,
-                                      QData rd) VL_MT_SAFE {
+static inline WDataOutP VL_SHIFTR_WWQ(int obits, int lbits, int rbits, WDataOutP owp,
+                                      WDataInP const lwp, QData rd) VL_MT_SAFE {
     WData rwp[VL_WQ_WORDS_E];
     VL_SET_WQ(rwp, rd);
     return VL_SHIFTR_WWW(obits, lbits, rbits, owp, lwp, rwp);
 }
 
-static inline IData VL_SHIFTR_IIW(int obits, int, int rbits, IData lhs, WDataInP rwp) VL_MT_SAFE {
+static inline IData VL_SHIFTR_IIW(int obits, int, int rbits, IData lhs,
+                                  WDataInP const rwp) VL_MT_SAFE {
     for (int i = 1; i < VL_WORDS_I(rbits); ++i) {
         if (VL_UNLIKELY(rwp[i])) {  // Huge shift 1>>32 or more
             return 0;
@@ -2558,7 +2570,8 @@ static inline IData VL_SHIFTR_IIW(int obits, int, int rbits, IData lhs, WDataInP
     }
     return VL_CLEAN_II(obits, obits, lhs >> rwp[0]);
 }
-static inline QData VL_SHIFTR_QQW(int obits, int, int rbits, QData lhs, WDataInP rwp) VL_MT_SAFE {
+static inline QData VL_SHIFTR_QQW(int obits, int, int rbits, QData lhs,
+                                  WDataInP const rwp) VL_MT_SAFE {
     for (int i = 1; i < VL_WORDS_I(rbits); ++i) {
         if (VL_UNLIKELY(rwp[i])) {  // Huge shift 1>>32 or more
             return 0;
@@ -2582,41 +2595,41 @@ static inline IData VL_SHIFTRS_III(int obits, int lbits, int, IData lhs, IData r
     // IEEE says signed if output signed, but bit position from lbits;
     // must use lbits for sign; lbits might != obits,
     // an EXTEND(SHIFTRS(...)) can became a SHIFTRS(...) within same 32/64 bit word length
-    IData sign = -(lhs >> (lbits - 1));  // ffff_ffff if negative
-    IData signext = ~(VL_MASK_I(lbits) >> rhs);  // One with bits where we've shifted "past"
+    const IData sign = -(lhs >> (lbits - 1));  // ffff_ffff if negative
+    const IData signext = ~(VL_MASK_I(lbits) >> rhs);  // One with bits where we've shifted "past"
     return (lhs >> rhs) | (sign & VL_CLEAN_II(obits, obits, signext));
 }
 static inline QData VL_SHIFTRS_QQI(int obits, int lbits, int, QData lhs, IData rhs) VL_PURE {
-    QData sign = -(lhs >> (lbits - 1));
-    QData signext = ~(VL_MASK_Q(lbits) >> rhs);
+    const QData sign = -(lhs >> (lbits - 1));
+    const QData signext = ~(VL_MASK_Q(lbits) >> rhs);
     return (lhs >> rhs) | (sign & VL_CLEAN_QQ(obits, obits, signext));
 }
 static inline IData VL_SHIFTRS_IQI(int obits, int lbits, int rbits, QData lhs, IData rhs) VL_PURE {
     return static_cast<IData>(VL_SHIFTRS_QQI(obits, lbits, rbits, lhs, rhs));
 }
-static inline WDataOutP VL_SHIFTRS_WWI(int obits, int lbits, int, WDataOutP owp, WDataInP lwp,
-                                       IData rd) VL_MT_SAFE {
-    int word_shift = VL_BITWORD_E(rd);
-    int bit_shift = VL_BITBIT_E(rd);
-    int lmsw = VL_WORDS_I(obits) - 1;
-    EData sign = VL_SIGNONES_E(lbits, lwp[lmsw]);
+static inline WDataOutP VL_SHIFTRS_WWI(int obits, int lbits, int, WDataOutP owp,
+                                       WDataInP const lwp, IData rd) VL_MT_SAFE {
+    const int word_shift = VL_BITWORD_E(rd);
+    const int bit_shift = VL_BITBIT_E(rd);
+    const int lmsw = VL_WORDS_I(obits) - 1;
+    const EData sign = VL_SIGNONES_E(lbits, lwp[lmsw]);
     if (rd >= static_cast<IData>(obits)) {  // Shifting past end, sign in all of lbits
         for (int i = 0; i <= lmsw; ++i) owp[i] = sign;
         owp[lmsw] &= VL_MASK_E(lbits);
     } else if (bit_shift == 0) {  // Aligned word shift (>>0,>>32,>>64 etc)
-        int copy_words = (VL_WORDS_I(obits) - word_shift);
+        const int copy_words = (VL_WORDS_I(obits) - word_shift);
         for (int i = 0; i < copy_words; ++i) owp[i] = lwp[i + word_shift];
         if (copy_words >= 0) owp[copy_words - 1] |= ~VL_MASK_E(obits) & sign;
         for (int i = copy_words; i < VL_WORDS_I(obits); ++i) owp[i] = sign;
         owp[lmsw] &= VL_MASK_E(lbits);
     } else {
-        int loffset = rd & VL_SIZEBITS_E;
+        const int loffset = rd & VL_SIZEBITS_E;
         int nbitsonright = VL_EDATASIZE - loffset;  // bits that end up in lword (know loffset!=0)
         // Middle words
-        int words = VL_WORDS_I(obits - rd);
+        const int words = VL_WORDS_I(obits - rd);
         for (int i = 0; i < words; ++i) {
             owp[i] = lwp[i + word_shift] >> loffset;
-            int upperword = i + word_shift + 1;
+            const int upperword = i + word_shift + 1;
             if (upperword < VL_WORDS_I(obits)) owp[i] |= lwp[upperword] << nbitsonright;
         }
         if (words) owp[words - 1] |= sign & ~VL_MASK_E(obits - loffset);
@@ -2626,12 +2639,12 @@ static inline WDataOutP VL_SHIFTRS_WWI(int obits, int lbits, int, WDataOutP owp,
     return owp;
 }
 static inline WDataOutP VL_SHIFTRS_WWW(int obits, int lbits, int rbits, WDataOutP owp,
-                                       WDataInP lwp, WDataInP rwp) VL_MT_SAFE {
+                                       WDataInP const lwp, WDataInP const rwp) VL_MT_SAFE {
     EData overshift = 0;  // Huge shift 1>>32 or more
     for (int i = 1; i < VL_WORDS_I(rbits); ++i) overshift |= rwp[i];
     if (VL_UNLIKELY(overshift || rwp[0] >= obits)) {
-        int lmsw = VL_WORDS_I(obits) - 1;
-        EData sign = VL_SIGNONES_E(lbits, lwp[lmsw]);
+        const int lmsw = VL_WORDS_I(obits) - 1;
+        const EData sign = VL_SIGNONES_E(lbits, lwp[lmsw]);
         for (int j = 0; j <= lmsw; ++j) owp[j] = sign;
         owp[lmsw] &= VL_MASK_E(lbits);
         return owp;
@@ -2639,27 +2652,27 @@ static inline WDataOutP VL_SHIFTRS_WWW(int obits, int lbits, int rbits, WDataOut
     return VL_SHIFTRS_WWI(obits, lbits, 32, owp, lwp, rwp[0]);
 }
 static inline WDataOutP VL_SHIFTRS_WWQ(int obits, int lbits, int rbits, WDataOutP owp,
-                                       WDataInP lwp, QData rd) VL_MT_SAFE {
+                                       WDataInP const lwp, QData rd) VL_MT_SAFE {
     WData rwp[VL_WQ_WORDS_E];
     VL_SET_WQ(rwp, rd);
     return VL_SHIFTRS_WWW(obits, lbits, rbits, owp, lwp, rwp);
 }
 static inline IData VL_SHIFTRS_IIW(int obits, int lbits, int rbits, IData lhs,
-                                   WDataInP rwp) VL_MT_SAFE {
+                                   WDataInP const rwp) VL_MT_SAFE {
     EData overshift = 0;  // Huge shift 1>>32 or more
     for (int i = 1; i < VL_WORDS_I(rbits); ++i) overshift |= rwp[i];
     if (VL_UNLIKELY(overshift || rwp[0] >= obits)) {
-        IData sign = -(lhs >> (lbits - 1));  // ffff_ffff if negative
+        const IData sign = -(lhs >> (lbits - 1));  // ffff_ffff if negative
         return VL_CLEAN_II(obits, obits, sign);
     }
     return VL_SHIFTRS_III(obits, lbits, 32, lhs, rwp[0]);
 }
 static inline QData VL_SHIFTRS_QQW(int obits, int lbits, int rbits, QData lhs,
-                                   WDataInP rwp) VL_MT_SAFE {
+                                   WDataInP const rwp) VL_MT_SAFE {
     EData overshift = 0;  // Huge shift 1>>32 or more
     for (int i = 1; i < VL_WORDS_I(rbits); ++i) overshift |= rwp[i];
     if (VL_UNLIKELY(overshift || rwp[0] >= obits)) {
-        QData sign = -(lhs >> (lbits - 1));  // ffff_ffff if negative
+        const QData sign = -(lhs >> (lbits - 1));  // ffff_ffff if negative
         return VL_CLEAN_QQ(obits, obits, sign);
     }
     return VL_SHIFTRS_QQI(obits, lbits, 32, lhs, rwp[0]);
@@ -2685,7 +2698,8 @@ static inline QData VL_SHIFTRS_QQQ(int obits, int lbits, int rbits, QData lhs, Q
 #define VL_BITSEL_QQII(obits, lbits, rbits, zbits, lhs, rhs) ((lhs) >> (rhs))
 #define VL_BITSEL_IQII(obits, lbits, rbits, zbits, lhs, rhs) (static_cast<IData>((lhs) >> (rhs)))
 
-static inline IData VL_BITSEL_IWII(int, int lbits, int, int, WDataInP lwp, IData rd) VL_MT_SAFE {
+static inline IData VL_BITSEL_IWII(int, int lbits, int, int, WDataInP const lwp,
+                                   IData rd) VL_MT_SAFE {
     int word = VL_BITWORD_E(rd);
     if (VL_UNLIKELY(rd > static_cast<IData>(lbits))) {
         return ~0;  // Spec says you can go outside the range of a array.  Don't coredump if so.
@@ -2702,7 +2716,7 @@ static inline IData VL_BITSEL_IWII(int, int lbits, int, int, WDataInP lwp, IData
 #define VL_SEL_IQII(obits, lbits, rbits, tbits, lhs, lsb, width) \
     (static_cast<IData>((lhs) >> (lsb)))
 
-static inline IData VL_SEL_IWII(int, int lbits, int, int, WDataInP lwp, IData lsb,
+static inline IData VL_SEL_IWII(int, int lbits, int, int, WDataInP const lwp, IData lsb,
                                 IData width) VL_MT_SAFE {
     int msb = lsb + width - 1;
     if (VL_UNLIKELY(msb >= lbits)) {
@@ -2716,32 +2730,32 @@ static inline IData VL_SEL_IWII(int, int lbits, int, int, WDataInP lwp, IData ls
     }
 }
 
-static inline QData VL_SEL_QWII(int, int lbits, int, int, WDataInP lwp, IData lsb,
+static inline QData VL_SEL_QWII(int, int lbits, int, int, WDataInP const lwp, IData lsb,
                                 IData width) VL_MT_SAFE {
-    int msb = lsb + width - 1;
+    const int msb = lsb + width - 1;
     if (VL_UNLIKELY(msb > lbits)) {
         return ~0;  // Spec says you can go outside the range of a array.  Don't coredump if so.
     } else if (VL_BITWORD_E(msb) == VL_BITWORD_E(static_cast<int>(lsb))) {
         return VL_BITRSHIFT_W(lwp, lsb);
     } else if (VL_BITWORD_E(msb) == 1 + VL_BITWORD_E(static_cast<int>(lsb))) {
-        int nbitsfromlow = VL_EDATASIZE - VL_BITBIT_E(lsb);
-        QData hi = (lwp[VL_BITWORD_E(msb)]);
-        QData lo = VL_BITRSHIFT_W(lwp, lsb);
+        const int nbitsfromlow = VL_EDATASIZE - VL_BITBIT_E(lsb);
+        const QData hi = (lwp[VL_BITWORD_E(msb)]);
+        const QData lo = VL_BITRSHIFT_W(lwp, lsb);
         return (hi << nbitsfromlow) | lo;
     } else {
         // 64 bit extraction may span three words
         int nbitsfromlow = VL_EDATASIZE - VL_BITBIT_E(lsb);
-        QData hi = (lwp[VL_BITWORD_E(msb)]);
-        QData mid = (lwp[VL_BITWORD_E(lsb) + 1]);
-        QData lo = VL_BITRSHIFT_W(lwp, lsb);
+        const QData hi = (lwp[VL_BITWORD_E(msb)]);
+        const QData mid = (lwp[VL_BITWORD_E(lsb) + 1]);
+        const QData lo = VL_BITRSHIFT_W(lwp, lsb);
         return (hi << (nbitsfromlow + VL_EDATASIZE)) | (mid << nbitsfromlow) | lo;
     }
 }
 
-static inline WDataOutP VL_SEL_WWII(int obits, int lbits, int, int, WDataOutP owp, WDataInP lwp,
-                                    IData lsb, IData width) VL_MT_SAFE {
-    int msb = lsb + width - 1;
-    int word_shift = VL_BITWORD_E(lsb);
+static inline WDataOutP VL_SEL_WWII(int obits, int lbits, int, int, WDataOutP owp,
+                                    WDataInP const lwp, IData lsb, IData width) VL_MT_SAFE {
+    const int msb = lsb + width - 1;
+    const int word_shift = VL_BITWORD_E(lsb);
     if (VL_UNLIKELY(msb > lbits)) {  // Outside bounds,
         for (int i = 0; i < VL_WORDS_I(obits) - 1; ++i) owp[i] = ~0;
         owp[VL_WORDS_I(obits) - 1] = VL_MASK_E(obits);
@@ -2750,13 +2764,13 @@ static inline WDataOutP VL_SEL_WWII(int obits, int lbits, int, int, WDataOutP ow
         for (int i = 0; i < VL_WORDS_I(obits); ++i) owp[i] = lwp[i + word_shift];
     } else {
         // Not a _vl_insert because the bits come from any bit number and goto bit 0
-        int loffset = lsb & VL_SIZEBITS_E;
-        int nbitsfromlow = VL_EDATASIZE - loffset;  // bits that end up in lword (know loffset!=0)
-        // Middle words
-        int words = VL_WORDS_I(msb - lsb + 1);
+        const int loffset = lsb & VL_SIZEBITS_E;
+        const int nbitsfromlow = VL_EDATASIZE - loffset;  // bits that end up in lword (know
+                                                          // loffset!=0) Middle words
+        const int words = VL_WORDS_I(msb - lsb + 1);
         for (int i = 0; i < words; ++i) {
             owp[i] = lwp[i + word_shift] >> loffset;
-            int upperword = i + word_shift + 1;
+            const int upperword = i + word_shift + 1;
             if (upperword <= static_cast<int>(VL_BITWORD_E(msb))) {
                 owp[i] |= lwp[upperword] << nbitsfromlow;
             }
@@ -2776,9 +2790,9 @@ static inline QData VL_RTOIROUND_Q_D(int, double lhs) VL_PURE {
     // This does not need to support subnormals as they are sub-integral
     lhs = VL_ROUND(lhs);
     if (lhs == 0.0) return 0;
-    QData q = VL_CVT_Q_D(lhs);
-    int lsb = static_cast<int>((q >> 52ULL) & VL_MASK_Q(11)) - 1023 - 52;
-    vluint64_t mantissa = (q & VL_MASK_Q(52)) | (1ULL << 52);
+    const QData q = VL_CVT_Q_D(lhs);
+    const int lsb = static_cast<int>((q >> 52ULL) & VL_MASK_Q(11)) - 1023 - 52;
+    const vluint64_t mantissa = (q & VL_MASK_Q(52)) | (1ULL << 52);
     vluint64_t out = 0;
     if (lsb < 0) {
         out = mantissa >> -lsb;
@@ -2797,9 +2811,9 @@ static inline WDataOutP VL_RTOIROUND_W_D(int obits, WDataOutP owp, double lhs) V
     lhs = VL_ROUND(lhs);
     VL_ZERO_W(obits, owp);
     if (lhs == 0.0) return owp;
-    QData q = VL_CVT_Q_D(lhs);
-    int lsb = static_cast<int>((q >> 52ULL) & VL_MASK_Q(11)) - 1023 - 52;
-    vluint64_t mantissa = (q & VL_MASK_Q(52)) | (1ULL << 52);
+    const QData q = VL_CVT_Q_D(lhs);
+    const int lsb = static_cast<int>((q >> 52ULL) & VL_MASK_Q(11)) - 1023 - 52;
+    const vluint64_t mantissa = (q & VL_MASK_Q(52)) | (1ULL << 52);
     if (lsb < 0) {
         VL_SET_WQ(owp, mantissa >> -lsb);
     } else if (lsb < obits) {
@@ -2837,8 +2851,8 @@ static inline void VL_ASSIGNSEL_QIIQ(int rbits, int obits, int lsb, QData& lhsr,
                                      QData rhs) VL_PURE {
     _vl_insert_QQ(obits, lhsr, rhs, lsb + obits - 1, lsb, rbits);
 }
-// static inline void VL_ASSIGNSEL_IIIW(int obits, int lsb, IData& lhsr, WDataInP rwp) VL_MT_SAFE {
-// Illegal, as lhs width >= rhs width
+// static inline void VL_ASSIGNSEL_IIIW(int obits, int lsb, IData& lhsr, WDataInP const rwp)
+// VL_MT_SAFE { Illegal, as lhs width >= rhs width
 static inline void VL_ASSIGNSEL_WIII(int rbits, int obits, int lsb, WDataOutP owp,
                                      IData rhs) VL_MT_SAFE {
     _vl_insert_WI(obits, owp, rhs, lsb + obits - 1, lsb, rbits);
@@ -2848,7 +2862,7 @@ static inline void VL_ASSIGNSEL_WIIQ(int rbits, int obits, int lsb, WDataOutP ow
     _vl_insert_WQ(obits, owp, rhs, lsb + obits - 1, lsb, rbits);
 }
 static inline void VL_ASSIGNSEL_WIIW(int rbits, int obits, int lsb, WDataOutP owp,
-                                     WDataInP rwp) VL_MT_SAFE {
+                                     WDataInP const rwp) VL_MT_SAFE {
     _vl_insert_WW(obits, owp, rwp, lsb + obits - 1, lsb, rbits);
 }
 
@@ -2856,8 +2870,8 @@ static inline void VL_ASSIGNSEL_WIIW(int rbits, int obits, int lsb, WDataOutP ow
 // Triops
 
 static inline WDataOutP VL_COND_WIWW(int obits, int, int, int, WDataOutP owp, int cond,
-                                     WDataInP w1p, WDataInP w2p) VL_MT_SAFE {
-    int words = VL_WORDS_I(obits);
+                                     WDataInP const w1p, WDataInP const w2p) VL_MT_SAFE {
+    const int words = VL_WORDS_I(obits);
     for (int i = 0; i < words; ++i) owp[i] = cond ? w1p[i] : w2p[i];
     return owp;
 }
diff --git a/include/verilated_cov.cpp b/include/verilated_cov.cpp
index 3cc223236..1fe14ba8d 100644
--- a/include/verilated_cov.cpp
+++ b/include/verilated_cov.cpp
@@ -193,7 +193,7 @@ private:
 
         // We used to backup and split on only .'s but it seems better to be verbose
         // and not assume . is the separator
-        std::string prefix = std::string(a, apre - a);
+        const std::string prefix = std::string(a, apre - a);
 
         // Scan backward to last mismatch
         const char* apost = a + std::strlen(a) - 1;
@@ -251,7 +251,7 @@ private:
 
 public:
     // PUBLIC METHODS
-    void forcePerInstance(bool flag) VL_MT_SAFE_EXCLUDES(m_mutex) {
+    void forcePerInstance(const bool flag) VL_MT_SAFE_EXCLUDES(m_mutex) {
         Verilated::quiesce();
         const VerilatedLockGuard lock(m_mutex);
         m_forcePerInstance = flag;
@@ -261,7 +261,7 @@ public:
         const VerilatedLockGuard lock(m_mutex);
         clearGuts();
     }
-    void clearNonMatch(const char* matchp) VL_MT_SAFE_EXCLUDES(m_mutex) {
+    void clearNonMatch(const char* const matchp) VL_MT_SAFE_EXCLUDES(m_mutex) {
         Verilated::quiesce();
         const VerilatedLockGuard lock(m_mutex);
         if (matchp && matchp[0]) {
@@ -288,7 +288,7 @@ public:
         assert(!m_insertp);
         m_insertp = itemp;
     }
-    void insertf(const char* filenamep, int lineno) VL_MT_SAFE_EXCLUDES(m_mutex) {
+    void insertf(const char* const filenamep, const int lineno) VL_MT_SAFE_EXCLUDES(m_mutex) {
         const VerilatedLockGuard lock(m_mutex);
         m_insertFilenamep = filenamep;
         m_insertLineno = lineno;
diff --git a/include/verilated_dpi.cpp b/include/verilated_dpi.cpp
index c40ec5c9a..8ec3fc457 100644
--- a/include/verilated_dpi.cpp
+++ b/include/verilated_dpi.cpp
@@ -79,19 +79,19 @@ void svPutBitselLogic(svLogicVecVal* dp, int bit, svLogic s) {
 
 void svGetPartselBit(svBitVecVal* dp, const svBitVecVal* sp, int lsb, int width) {
     // See also VL_SEL_WWI
-    int msb = lsb + width - 1;
-    int word_shift = VL_BITWORD_I(lsb);
+    const int msb = lsb + width - 1;
+    const int word_shift = VL_BITWORD_I(lsb);
     if (VL_BITBIT_I(lsb) == 0) {
         // Just a word extract
         for (int i = 0; i < VL_WORDS_I(width); ++i) dp[i] = sp[i + word_shift];
     } else {
-        int loffset = lsb & VL_SIZEBITS_I;
-        int nbitsfromlow = 32 - loffset;  // bits that end up in lword (know loffset!=0)
+        const int loffset = lsb & VL_SIZEBITS_I;
+        const int nbitsfromlow = 32 - loffset;  // bits that end up in lword (know loffset!=0)
         // Middle words
-        int words = VL_WORDS_I(msb - lsb + 1);
+        const int words = VL_WORDS_I(msb - lsb + 1);
         for (int i = 0; i < words; ++i) {
             dp[i] = sp[i + word_shift] >> loffset;
-            int upperword = i + word_shift + 1;
+            const int upperword = i + word_shift + 1;
             if (upperword <= static_cast<int>(VL_BITWORD_I(msb))) {
                 dp[i] |= sp[upperword] << nbitsfromlow;
             }
@@ -101,20 +101,20 @@ void svGetPartselBit(svBitVecVal* dp, const svBitVecVal* sp, int lsb, int width)
     dp[VL_WORDS_I(width) - 1] &= VL_MASK_I(width);
 }
 void svGetPartselLogic(svLogicVecVal* dp, const svLogicVecVal* sp, int lsb, int width) {
-    int msb = lsb + width - 1;
-    int word_shift = VL_BITWORD_I(lsb);
+    const int msb = lsb + width - 1;
+    const int word_shift = VL_BITWORD_I(lsb);
     if (VL_BITBIT_I(lsb) == 0) {
         // Just a word extract
         for (int i = 0; i < VL_WORDS_I(width); ++i) dp[i] = sp[i + word_shift];
     } else {
-        int loffset = lsb & VL_SIZEBITS_I;
-        int nbitsfromlow = 32 - loffset;  // bits that end up in lword (know loffset!=0)
+        const int loffset = lsb & VL_SIZEBITS_I;
+        const int nbitsfromlow = 32 - loffset;  // bits that end up in lword (know loffset!=0)
         // Middle words
-        int words = VL_WORDS_I(msb - lsb + 1);
+        const int words = VL_WORDS_I(msb - lsb + 1);
         for (int i = 0; i < words; ++i) {
             dp[i].aval = sp[i + word_shift].aval >> loffset;
             dp[i].bval = sp[i + word_shift].bval >> loffset;
-            int upperword = i + word_shift + 1;
+            const int upperword = i + word_shift + 1;
             if (upperword <= static_cast<int>(VL_BITWORD_I(msb))) {
                 dp[i].aval |= sp[upperword].aval << nbitsfromlow;
                 dp[i].bval |= sp[upperword].bval << nbitsfromlow;
@@ -127,22 +127,22 @@ void svGetPartselLogic(svLogicVecVal* dp, const svLogicVecVal* sp, int lsb, int
 }
 void svPutPartselBit(svBitVecVal* dp, const svBitVecVal s, int lbit, int width) {
     // See also _vl_insert_WI
-    int hbit = lbit + width - 1;
-    int hoffset = VL_BITBIT_I(hbit);
-    int loffset = VL_BITBIT_I(lbit);
+    const int hbit = lbit + width - 1;
+    const int hoffset = VL_BITBIT_I(hbit);
+    const int loffset = VL_BITBIT_I(lbit);
     if (hoffset == VL_SIZEBITS_I && loffset == 0) {
         // Fast and common case, word based insertion
         dp[VL_BITWORD_I(lbit)] = s;
     } else {
-        int hword = VL_BITWORD_I(hbit);
-        int lword = VL_BITWORD_I(lbit);
+        const int hword = VL_BITWORD_I(hbit);
+        const int lword = VL_BITWORD_I(lbit);
         if (hword == lword) {  // know < 32 bits because above checks it
-            IData insmask = (VL_MASK_I(hoffset - loffset + 1)) << loffset;
+            const IData insmask = (VL_MASK_I(hoffset - loffset + 1)) << loffset;
             dp[lword] = (dp[lword] & ~insmask) | ((s << loffset) & insmask);
         } else {
-            IData hinsmask = (VL_MASK_I(hoffset - 0 + 1)) << 0;
-            IData linsmask = (VL_MASK_I(31 - loffset + 1)) << loffset;
-            int nbitsonright = 32 - loffset;  // bits that end up in lword
+            const IData hinsmask = (VL_MASK_I(hoffset - 0 + 1)) << 0;
+            const IData linsmask = (VL_MASK_I(31 - loffset + 1)) << loffset;
+            const int nbitsonright = 32 - loffset;  // bits that end up in lword
             dp[lword] = (dp[lword] & ~linsmask) | ((s << loffset) & linsmask);
             dp[hword] = (dp[hword] & ~hinsmask) | ((s >> nbitsonright) & hinsmask);
         }
@@ -150,24 +150,24 @@ void svPutPartselBit(svBitVecVal* dp, const svBitVecVal s, int lbit, int width)
 }
 // cppcheck-suppress passedByValue
 void svPutPartselLogic(svLogicVecVal* dp, const svLogicVecVal s, int lbit, int width) {
-    int hbit = lbit + width - 1;
-    int hoffset = VL_BITBIT_I(hbit);
-    int loffset = VL_BITBIT_I(lbit);
+    const int hbit = lbit + width - 1;
+    const int hoffset = VL_BITBIT_I(hbit);
+    const int loffset = VL_BITBIT_I(lbit);
     if (hoffset == VL_SIZEBITS_I && loffset == 0) {
         // Fast and common case, word based insertion
         dp[VL_BITWORD_I(lbit)].aval = s.aval;
         dp[VL_BITWORD_I(lbit)].bval = s.bval;
     } else {
-        int hword = VL_BITWORD_I(hbit);
-        int lword = VL_BITWORD_I(lbit);
+        const int hword = VL_BITWORD_I(hbit);
+        const int lword = VL_BITWORD_I(lbit);
         if (hword == lword) {  // know < 32 bits because above checks it
-            IData insmask = (VL_MASK_I(hoffset - loffset + 1)) << loffset;
+            const IData insmask = (VL_MASK_I(hoffset - loffset + 1)) << loffset;
             dp[lword].aval = (dp[lword].aval & ~insmask) | ((s.aval << loffset) & insmask);
             dp[lword].bval = (dp[lword].bval & ~insmask) | ((s.bval << loffset) & insmask);
         } else {
-            IData hinsmask = (VL_MASK_I(hoffset - 0 + 1)) << 0;
-            IData linsmask = (VL_MASK_I(31 - loffset + 1)) << loffset;
-            int nbitsonright = 32 - loffset;  // bits that end up in lword
+            const IData hinsmask = (VL_MASK_I(hoffset - 0 + 1)) << 0;
+            const IData linsmask = (VL_MASK_I(31 - loffset + 1)) << loffset;
+            const int nbitsonright = 32 - loffset;  // bits that end up in lword
             dp[lword].aval = (dp[lword].aval & ~linsmask) | ((s.aval << loffset) & linsmask);
             dp[lword].bval = (dp[lword].bval & ~linsmask) | ((s.bval << loffset) & linsmask);
             dp[hword].aval = (dp[hword].aval & ~hinsmask) | ((s.aval >> nbitsonright) & hinsmask);
@@ -460,13 +460,13 @@ void svPutBitArrElemVecVal(const svOpenArrayHandle d, const svBitVecVal* s, int
     switch (varp->udims()) {
     case 1: _vl_svPutBitArrElemVecVal(d, s, 1, indx1, 0, 0); break;
     case 2: {
-        int indx2 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
         _vl_svPutBitArrElemVecVal(d, s, 2, indx1, indx2, 0);
         break;
     }
     case 3: {
-        int indx2 = va_arg(ap, int);
-        int indx3 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
+        const int indx3 = va_arg(ap, int);
         _vl_svPutBitArrElemVecVal(d, s, 3, indx1, indx2, indx3);
         break;
     }
@@ -492,13 +492,13 @@ void svPutLogicArrElemVecVal(const svOpenArrayHandle d, const svLogicVecVal* s,
     switch (varp->udims()) {
     case 1: _vl_svPutLogicArrElemVecVal(d, s, 1, indx1, 0, 0); break;
     case 2: {
-        int indx2 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
         _vl_svPutLogicArrElemVecVal(d, s, 2, indx1, indx2, 0);
         break;
     }
     case 3: {
-        int indx2 = va_arg(ap, int);
-        int indx3 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
+        const int indx3 = va_arg(ap, int);
         _vl_svPutLogicArrElemVecVal(d, s, 3, indx1, indx2, indx3);
         break;
     }
@@ -528,13 +528,13 @@ void svGetBitArrElemVecVal(svBitVecVal* d, const svOpenArrayHandle s, int indx1,
     switch (varp->udims()) {
     case 1: _vl_svGetBitArrElemVecVal(d, s, 1, indx1, 0, 0); break;
     case 2: {
-        int indx2 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
         _vl_svGetBitArrElemVecVal(d, s, 2, indx1, indx2, 0);
         break;
     }
     case 3: {
-        int indx2 = va_arg(ap, int);
-        int indx3 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
+        const int indx3 = va_arg(ap, int);
         _vl_svGetBitArrElemVecVal(d, s, 3, indx1, indx2, indx3);
         break;
     }
@@ -559,13 +559,13 @@ void svGetLogicArrElemVecVal(svLogicVecVal* d, const svOpenArrayHandle s, int in
     switch (varp->udims()) {
     case 1: _vl_svGetLogicArrElemVecVal(d, s, 1, indx1, 0, 0); break;
     case 2: {
-        int indx2 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
         _vl_svGetLogicArrElemVecVal(d, s, 2, indx1, indx2, 0);
         break;
     }
     case 3: {
-        int indx2 = va_arg(ap, int);
-        int indx3 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
+        const int indx3 = va_arg(ap, int);
         _vl_svGetLogicArrElemVecVal(d, s, 3, indx1, indx2, indx3);
         break;
     }
@@ -592,13 +592,13 @@ svBit svGetBitArrElem(const svOpenArrayHandle s, int indx1, ...) {
     switch (varp->udims()) {
     case 1: out = _vl_svGetBitArrElem(s, 1, indx1, 0, 0, 0); break;
     case 2: {
-        int indx2 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
         out = _vl_svGetBitArrElem(s, 2, indx1, indx2, 0, 0);
         break;
     }
     case 3: {
-        int indx2 = va_arg(ap, int);
-        int indx3 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
+        const int indx3 = va_arg(ap, int);
         out = _vl_svGetBitArrElem(s, 3, indx1, indx2, indx3, 0);
         break;
     }
@@ -625,13 +625,13 @@ svLogic svGetLogicArrElem(const svOpenArrayHandle s, int indx1, ...) {
     switch (varp->udims()) {
     case 1: out = _vl_svGetBitArrElem(s, 1, indx1, 0, 0, 0); break;
     case 2: {
-        int indx2 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
         out = _vl_svGetBitArrElem(s, 2, indx1, indx2, 0, 0);
         break;
     }
     case 3: {
-        int indx2 = va_arg(ap, int);
-        int indx3 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
+        const int indx3 = va_arg(ap, int);
         out = _vl_svGetBitArrElem(s, 3, indx1, indx2, indx3, 0);
         break;
     }
@@ -660,13 +660,13 @@ void svPutBitArrElem(const svOpenArrayHandle d, svBit value, int indx1, ...) {
     switch (varp->udims()) {
     case 1: _vl_svPutBitArrElem(d, value, 1, indx1, 0, 0, 0); break;
     case 2: {
-        int indx2 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
         _vl_svPutBitArrElem(d, value, 2, indx1, indx2, 0, 0);
         break;
     }
     case 3: {
-        int indx2 = va_arg(ap, int);
-        int indx3 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
+        const int indx3 = va_arg(ap, int);
         _vl_svPutBitArrElem(d, value, 3, indx1, indx2, indx3, 0);
         break;
     }
@@ -691,13 +691,13 @@ void svPutLogicArrElem(const svOpenArrayHandle d, svLogic value, int indx1, ...)
     switch (varp->udims()) {
     case 1: _vl_svPutBitArrElem(d, value, 1, indx1, 0, 0, 0); break;
     case 2: {
-        int indx2 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
         _vl_svPutBitArrElem(d, value, 2, indx1, indx2, 0, 0);
         break;
     }
     case 3: {
-        int indx2 = va_arg(ap, int);
-        int indx3 = va_arg(ap, int);
+        const int indx2 = va_arg(ap, int);
+        const int indx3 = va_arg(ap, int);
         _vl_svPutBitArrElem(d, value, 3, indx1, indx2, indx3, 0);
         break;
     }
diff --git a/include/verilated_dpi.h b/include/verilated_dpi.h
index 8834342b9..d86e741fa 100644
--- a/include/verilated_dpi.h
+++ b/include/verilated_dpi.h
@@ -38,7 +38,7 @@
 
 // Convert svBitVecVal to Verilator internal data
 static inline void VL_SET_W_SVBV(int obits, WDataOutP owp, const svBitVecVal* lwp) VL_MT_SAFE {
-    int words = VL_WORDS_I(obits);
+    const int words = VL_WORDS_I(obits);
     for (int i = 0; i < words - 1; ++i) owp[i] = lwp[i];
     owp[words - 1] = lwp[words - 1] & VL_MASK_I(obits);
 }
@@ -48,20 +48,20 @@ static inline QData VL_SET_Q_SVBV(const svBitVecVal* lwp) VL_MT_SAFE {
 static inline IData VL_SET_I_SVBV(const svBitVecVal* lwp) VL_MT_SAFE { return lwp[0]; }
 
 // Convert Verilator internal data to svBitVecVal
-static inline void VL_SET_SVBV_W(int obits, svBitVecVal* owp, WDataInP lwp) VL_MT_SAFE {
-    int words = VL_WORDS_I(obits);
+static inline void VL_SET_SVBV_W(int obits, svBitVecVal* owp, const WDataInP lwp) VL_MT_SAFE {
+    const int words = VL_WORDS_I(obits);
     for (int i = 0; i < words - 1; ++i) owp[i] = lwp[i];
     owp[words - 1] = lwp[words - 1] & VL_MASK_I(obits);
 }
-static inline void VL_SET_SVBV_I(int, svBitVecVal* owp, IData ld) VL_MT_SAFE { owp[0] = ld; }
-static inline void VL_SET_SVBV_Q(int, svBitVecVal* owp, QData ld) VL_MT_SAFE {
+static inline void VL_SET_SVBV_I(int, svBitVecVal* owp, const IData ld) VL_MT_SAFE { owp[0] = ld; }
+static inline void VL_SET_SVBV_Q(int, svBitVecVal* owp, const QData ld) VL_MT_SAFE {
     VL_SET_WQ(owp, ld);
 }
 
 // Convert svLogicVecVal to Verilator internal data
 // Note these functions ignore X/Z in svLogicVecVal
 static inline void VL_SET_W_SVLV(int obits, WDataOutP owp, const svLogicVecVal* lwp) VL_MT_SAFE {
-    int words = VL_WORDS_I(obits);
+    const int words = VL_WORDS_I(obits);
     for (int i = 0; i < words - 1; ++i) owp[i] = lwp[i].aval;
     owp[words - 1] = lwp[words - 1].aval & VL_MASK_I(obits);
 }
@@ -72,17 +72,17 @@ static inline IData VL_SET_I_SVLV(const svLogicVecVal* lwp) VL_MT_SAFE { return
 
 // Convert Verilator internal data to svLogicVecVal
 // Note these functions never create X/Z in svLogicVecVal
-static inline void VL_SET_SVLV_W(int obits, svLogicVecVal* owp, WDataInP lwp) VL_MT_SAFE {
-    int words = VL_WORDS_I(obits);
+static inline void VL_SET_SVLV_W(int obits, svLogicVecVal* owp, const WDataInP lwp) VL_MT_SAFE {
+    const int words = VL_WORDS_I(obits);
     for (int i = 0; i < words; ++i) owp[i].bval = 0;
     for (int i = 0; i < words - 1; ++i) owp[i].aval = lwp[i];
     owp[words - 1].aval = lwp[words - 1] & VL_MASK_I(obits);
 }
-static inline void VL_SET_SVLV_I(int, svLogicVecVal* owp, IData ld) VL_MT_SAFE {
+static inline void VL_SET_SVLV_I(int, svLogicVecVal* owp, const IData ld) VL_MT_SAFE {
     owp[0].aval = ld;
     owp[0].bval = 0;
 }
-static inline void VL_SET_SVLV_Q(int, svLogicVecVal* owp, QData ld) VL_MT_SAFE {
+static inline void VL_SET_SVLV_Q(int, svLogicVecVal* owp, const QData ld) VL_MT_SAFE {
     VlWide<2> lwp;
     VL_SET_WQ(lwp, ld);
     owp[0].aval = lwp[0];
diff --git a/include/verilated_fst_c.cpp b/include/verilated_fst_c.cpp
index 0fccee988..9d91029de 100644
--- a/include/verilated_fst_c.cpp
+++ b/include/verilated_fst_c.cpp
@@ -150,7 +150,7 @@ void VerilatedFst::emitTimeChange(vluint64_t timeui) { fstWriterEmitTimeChange(m
 void VerilatedFst::declDTypeEnum(int dtypenum, const char* name, vluint32_t elements,
                                  unsigned int minValbits, const char** itemNamesp,
                                  const char** itemValuesp) {
-    fstEnumHandle enumNum
+    const fstEnumHandle enumNum
         = fstWriterCreateEnumTable(m_fst, name, elements, minValbits, itemNamesp, itemValuesp);
     m_local2fstdtype[dtypenum] = enumNum;
 }
@@ -206,7 +206,7 @@ void VerilatedFst::declare(vluint32_t code, const char* name, int dtypenum, fstV
     std::string name_str = name_ss.str();
 
     if (dtypenum > 0) {
-        fstEnumHandle enumNum = m_local2fstdtype[dtypenum];
+        const fstEnumHandle enumNum = m_local2fstdtype[dtypenum];
         fstWriterEmitEnumTableRef(m_fst, enumNum);
     }
 
diff --git a/include/verilated_fst_sc.h b/include/verilated_fst_sc.h
index b58e98fe7..c9ad874d7 100644
--- a/include/verilated_fst_sc.h
+++ b/include/verilated_fst_sc.h
@@ -42,9 +42,9 @@ public:
         // We want to avoid a depreciated warning, but still be back compatible.
         // Turning off the message just for this still results in an
         // annoying "to turn off" message.
-        sc_time t1sec(1, SC_SEC);
+        const sc_time t1sec(1, SC_SEC);
         if (t1sec.to_default_time_units() != 0) {
-            sc_time tunits(1.0 / t1sec.to_default_time_units(), SC_SEC);
+            const sc_time tunits(1.0 / t1sec.to_default_time_units(), SC_SEC);
             spTrace()->set_time_unit(tunits.to_string());
         }
         spTrace()->set_time_resolution(sc_get_time_resolution().to_string());
diff --git a/include/verilated_heavy.h b/include/verilated_heavy.h
index 7b9218ff1..a0f8107bd 100644
--- a/include/verilated_heavy.h
+++ b/include/verilated_heavy.h
@@ -43,7 +43,7 @@ extern std::string VL_TO_STRING(SData lhs);
 extern std::string VL_TO_STRING(IData lhs);
 extern std::string VL_TO_STRING(QData lhs);
 inline std::string VL_TO_STRING(const std::string& obj) { return "\"" + obj + "\""; }
-extern std::string VL_TO_STRING_W(int words, WDataInP obj);
+extern std::string VL_TO_STRING_W(int words, const WDataInP obj);
 
 //===================================================================
 // Shuffle RNG
@@ -131,7 +131,8 @@ template <std::size_t T_Words> struct VlWide final {
 
 // Convert a C array to std::array reference by pointer magic, without copy.
 // Data type (second argument) is so the function template can automatically generate.
-template <std::size_t T_Words> VlWide<T_Words>& VL_CVT_W_A(WDataInP inp, const VlWide<T_Words>&) {
+template <std::size_t T_Words>
+VlWide<T_Words>& VL_CVT_W_A(const WDataInP inp, const VlWide<T_Words>&) {
     return *((VlWide<T_Words>*)inp);
 }
 
@@ -795,7 +796,7 @@ void VL_WRITEMEM_N(bool hex, int bits, const std::string& filename,
     VlWriteMem wmem(hex, bits, filename, start, end);
     if (VL_UNLIKELY(!wmem.isOpen())) return;
     for (const auto& i : obj) {
-        QData addr = i.first;
+        const QData addr = i.first;
         if (addr >= start && addr <= end) wmem.print(addr, true, &(i.second));
     }
 }
@@ -876,7 +877,7 @@ static inline bool VL_CAST_DYNAMIC(VlClassRef<T> in, VlClassRef<U>& outr) {
 //======================================================================
 // Conversion functions
 
-extern std::string VL_CVT_PACK_STR_NW(int lwords, WDataInP lwp) VL_MT_SAFE;
+extern std::string VL_CVT_PACK_STR_NW(int lwords, const WDataInP lwp) VL_MT_SAFE;
 inline std::string VL_CVT_PACK_STR_NQ(QData lhs) VL_PURE {
     VlWide<VL_WQ_WORDS_E> lw;
     VL_SET_WQ(lw, lhs);
diff --git a/include/verilated_save.cpp b/include/verilated_save.cpp
index df5ada28c..0c07022ea 100644
--- a/include/verilated_save.cpp
+++ b/include/verilated_save.cpp
@@ -72,9 +72,10 @@ bool VerilatedDeserialize::readDiffers(const void* __restrict datap,
 VerilatedDeserialize& VerilatedDeserialize::readAssert(const void* __restrict datap,
                                                        size_t size) VL_MT_UNSAFE_ONE {
     if (VL_UNLIKELY(readDiffers(datap, size))) {
-        std::string fn = filename();
-        std::string msg = "Can't deserialize save-restore file as was made from different model: "
-                          + filename();
+        const std::string fn = filename();
+        const std::string msg
+            = "Can't deserialize save-restore file as was made from different model: "
+              + filename();
         VL_FATAL_MT(fn.c_str(), 0, "", msg.c_str());
         // Die before we close() as close would infinite loop
     }
@@ -90,8 +91,8 @@ void VerilatedSerialize::header() VL_MT_UNSAFE_ONE {
 void VerilatedDeserialize::header() VL_MT_UNSAFE_ONE {
     VerilatedDeserialize& os = *this;  // So can cut and paste standard >> code below
     if (VL_UNLIKELY(os.readDiffers(VLTSAVE_HEADER_STR, std::strlen(VLTSAVE_HEADER_STR)))) {
-        std::string fn = filename();
-        std::string msg
+        const std::string fn = filename();
+        const std::string msg
             = std::string(
                   "Can't deserialize; file has wrong header signature, or file not found: ")
               + filename();
@@ -109,9 +110,10 @@ void VerilatedSerialize::trailer() VL_MT_UNSAFE_ONE {
 void VerilatedDeserialize::trailer() VL_MT_UNSAFE_ONE {
     VerilatedDeserialize& os = *this;  // So can cut and paste standard >> code below
     if (VL_UNLIKELY(os.readDiffers(VLTSAVE_TRAILER_STR, std::strlen(VLTSAVE_TRAILER_STR)))) {
-        std::string fn = filename();
-        std::string msg = std::string("Can't deserialize; file has wrong end-of-file signature: ")
-                          + filename();
+        const std::string fn = filename();
+        const std::string msg
+            = std::string("Can't deserialize; file has wrong end-of-file signature: ")
+              + filename();
         VL_FATAL_MT(fn.c_str(), 0, "", msg.c_str());
         // Die before we close() as close would infinite loop
     }
@@ -192,10 +194,10 @@ void VerilatedSave::flush() VL_MT_UNSAFE_ONE {
     if (VL_UNLIKELY(!isOpen())) return;
     vluint8_t* wp = m_bufp;
     while (true) {
-        ssize_t remaining = (m_cp - wp);
+        const ssize_t remaining = (m_cp - wp);
         if (remaining == 0) break;
         errno = 0;
-        ssize_t got = ::write(m_fd, wp, remaining);
+        const ssize_t got = ::write(m_fd, wp, remaining);
         if (got > 0) {
             wp += got;
         } else if (VL_UNCOVERABLE(got < 0)) {
@@ -223,17 +225,17 @@ void VerilatedRestore::fill() VL_MT_UNSAFE_ONE {
     m_cp = m_bufp;  // Reset buffer
     // Read into buffer starting at m_endp
     while (true) {
-        ssize_t remaining = (m_bufp + bufferSize() - m_endp);
+        const ssize_t remaining = (m_bufp + bufferSize() - m_endp);
         if (remaining == 0) break;
         errno = 0;
-        ssize_t got = ::read(m_fd, m_endp, remaining);
+        const ssize_t got = ::read(m_fd, m_endp, remaining);
         if (got > 0) {
             m_endp += got;
         } else if (VL_UNCOVERABLE(got < 0)) {
             if (VL_UNCOVERABLE(errno != EAGAIN && errno != EINTR)) {
                 // LCOV_EXCL_START
                 // write failed, presume error (perhaps out of disk space)
-                std::string msg = std::string(__FUNCTION__) + ": " + std::strerror(errno);
+                const std::string msg = std::string(__FUNCTION__) + ": " + std::strerror(errno);
                 VL_FATAL_MT("", 0, "", msg.c_str());
                 close();
                 break;
diff --git a/include/verilated_save.h b/include/verilated_save.h
index 937e59524..1a6c14e13 100644
--- a/include/verilated_save.h
+++ b/include/verilated_save.h
@@ -236,43 +236,43 @@ public:
 
 //=============================================================================
 
-inline VerilatedSerialize& operator<<(VerilatedSerialize& os, vluint64_t& rhs) {
+inline VerilatedSerialize& operator<<(VerilatedSerialize& os, const vluint64_t& rhs) {
     return os.write(&rhs, sizeof(rhs));
 }
 inline VerilatedDeserialize& operator>>(VerilatedDeserialize& os, vluint64_t& rhs) {
     return os.read(&rhs, sizeof(rhs));
 }
-inline VerilatedSerialize& operator<<(VerilatedSerialize& os, vluint32_t& rhs) {
+inline VerilatedSerialize& operator<<(VerilatedSerialize& os, const vluint32_t& rhs) {
     return os.write(&rhs, sizeof(rhs));
 }
 inline VerilatedDeserialize& operator>>(VerilatedDeserialize& os, vluint32_t& rhs) {
     return os.read(&rhs, sizeof(rhs));
 }
-inline VerilatedSerialize& operator<<(VerilatedSerialize& os, vluint16_t& rhs) {
+inline VerilatedSerialize& operator<<(VerilatedSerialize& os, const vluint16_t& rhs) {
     return os.write(&rhs, sizeof(rhs));
 }
 inline VerilatedDeserialize& operator>>(VerilatedDeserialize& os, vluint16_t& rhs) {
     return os.read(&rhs, sizeof(rhs));
 }
-inline VerilatedSerialize& operator<<(VerilatedSerialize& os, vluint8_t& rhs) {
+inline VerilatedSerialize& operator<<(VerilatedSerialize& os, const vluint8_t& rhs) {
     return os.write(&rhs, sizeof(rhs));
 }
 inline VerilatedDeserialize& operator>>(VerilatedDeserialize& os, vluint8_t& rhs) {
     return os.read(&rhs, sizeof(rhs));
 }
-inline VerilatedSerialize& operator<<(VerilatedSerialize& os, bool& rhs) {
+inline VerilatedSerialize& operator<<(VerilatedSerialize& os, const bool& rhs) {
     return os.write(&rhs, sizeof(rhs));
 }
 inline VerilatedDeserialize& operator>>(VerilatedDeserialize& os, bool& rhs) {
     return os.read(&rhs, sizeof(rhs));
 }
-inline VerilatedSerialize& operator<<(VerilatedSerialize& os, double& rhs) {
+inline VerilatedSerialize& operator<<(VerilatedSerialize& os, const double& rhs) {
     return os.write(&rhs, sizeof(rhs));
 }
 inline VerilatedDeserialize& operator>>(VerilatedDeserialize& os, double& rhs) {
     return os.read(&rhs, sizeof(rhs));
 }
-inline VerilatedSerialize& operator<<(VerilatedSerialize& os, float& rhs) {
+inline VerilatedSerialize& operator<<(VerilatedSerialize& os, const float& rhs) {
     return os.write(&rhs, sizeof(rhs));
 }
 inline VerilatedDeserialize& operator>>(VerilatedDeserialize& os, float& rhs) {
@@ -295,11 +295,11 @@ VerilatedDeserialize& operator>>(VerilatedDeserialize& os, VerilatedContext* rhs
 template <class T_Key, class T_Value>
 VerilatedSerialize& operator<<(VerilatedSerialize& os, VlAssocArray<T_Key, T_Value>& rhs) {
     os << rhs.atDefault();
-    vluint32_t len = rhs.size();
+    const vluint32_t len = rhs.size();
     os << len;
     for (const auto& i : rhs) {
-        T_Key index = i.first;  // Copy to get around const_iterator
-        T_Value value = i.second;
+        const T_Key index = i.first;  // Copy to get around const_iterator
+        const T_Value value = i.second;
         os << index << value;
     }
     return os;
diff --git a/include/verilated_threads.cpp b/include/verilated_threads.cpp
index a4e2bfb73..8d3480540 100644
--- a/include/verilated_threads.cpp
+++ b/include/verilated_threads.cpp
@@ -93,7 +93,7 @@ void VlWorkerThread::startWorker(VlWorkerThread* workerp) {
 VlThreadPool::VlThreadPool(VerilatedContext* contextp, int nThreads, bool profiling)
     : m_profiling{profiling} {
     // --threads N passes nThreads=N-1, as the "main" threads counts as 1
-    unsigned cpus = std::thread::hardware_concurrency();
+    const unsigned cpus = std::thread::hardware_concurrency();
     if (cpus < nThreads + 1) {
         static int warnedOnce = 0;
         if (!warnedOnce++) {
@@ -149,7 +149,7 @@ void VlThreadPool::profileDump(const char* filenamep, vluint64_t ticksElapsed)
     const VerilatedLockGuard lk(m_mutex);
     VL_DEBUG_IF(VL_DBG_MSGF("+prof+threads writing to '%s'\n", filenamep););
 
-    FILE* fp = std::fopen(filenamep, "w");
+    FILE* const fp = std::fopen(filenamep, "w");
     if (VL_UNLIKELY(!fp)) {
         VL_FATAL_MT(filenamep, 0, "", "+prof+threads+file file not writable");
         // cppcheck-suppress resourceLeak   // bug, doesn't realize fp is nullptr
diff --git a/include/verilated_threads.h b/include/verilated_threads.h
index e01315646..b6163477b 100644
--- a/include/verilated_threads.h
+++ b/include/verilated_threads.h
@@ -99,19 +99,19 @@ public:
     // false while it's still waiting on more dependencies.
     inline bool signalUpstreamDone(bool evenCycle) {
         if (evenCycle) {
-            vluint32_t upstreamDepsDone
+            const vluint32_t upstreamDepsDone
                 = 1 + m_upstreamDepsDone.fetch_add(1, std::memory_order_release);
             assert(upstreamDepsDone <= m_upstreamDepCount);
             return (upstreamDepsDone == m_upstreamDepCount);
         } else {
-            vluint32_t upstreamDepsDone_prev
+            const vluint32_t upstreamDepsDone_prev
                 = m_upstreamDepsDone.fetch_sub(1, std::memory_order_release);
             assert(upstreamDepsDone_prev > 0);
             return (upstreamDepsDone_prev == 1);
         }
     }
     inline bool areUpstreamDepsDone(bool evenCycle) const {
-        vluint32_t target = evenCycle ? m_upstreamDepCount : 0;
+        const vluint32_t target = evenCycle ? m_upstreamDepCount : 0;
         return m_upstreamDepsDone.load(std::memory_order_acquire) == target;
     }
     inline void waitUntilUpstreamDone(bool evenCycle) const {
diff --git a/include/verilated_vcd_c.cpp b/include/verilated_vcd_c.cpp
index ccbccde8e..798618643 100644
--- a/include/verilated_vcd_c.cpp
+++ b/include/verilated_vcd_c.cpp
@@ -129,7 +129,7 @@ void VerilatedVcd::openNextImp(bool incFilename) {
     if (incFilename) {
         // Find _0000.{ext} in filename
         std::string name = m_filename;
-        size_t pos = name.rfind('.');
+        const size_t pos = name.rfind('.');
         if (pos > 8 && 0 == std::strncmp("_cat", name.c_str() + pos - 8, 4)
             && std::isdigit(name.c_str()[pos - 4]) && std::isdigit(name.c_str()[pos - 3])
             && std::isdigit(name.c_str()[pos - 2]) && std::isdigit(name.c_str()[pos - 1])) {
@@ -299,10 +299,10 @@ void VerilatedVcd::bufferFlush() VL_MT_UNSAFE_ONE {
     if (VL_UNLIKELY(!isOpen())) return;
     char* wp = m_wrBufp;
     while (true) {
-        ssize_t remaining = (m_writep - wp);
+        const ssize_t remaining = (m_writep - wp);
         if (remaining == 0) break;
         errno = 0;
-        ssize_t got = m_filep->write(wp, remaining);
+        const ssize_t got = m_filep->write(wp, remaining);
         if (got > 0) {
             wp += got;
             m_wroteBytes += got;
@@ -352,7 +352,7 @@ void VerilatedVcd::dumpHeader() {
     printStr("$version Generated by VerilatedVcd $end\n");
     printStr("$date ");
     {
-        time_t tick = time(nullptr);
+        const time_t tick = time(nullptr);
         tm ticktm;
         VL_LOCALTIME_R(&tick, &ticktm);
         constexpr int bufsize = 50;
diff --git a/include/verilated_vcd_c.h b/include/verilated_vcd_c.h
index d167d3977..6eb3f1d6b 100644
--- a/include/verilated_vcd_c.h
+++ b/include/verilated_vcd_c.h
@@ -233,11 +233,11 @@ public:
     // Inside dumping routines, dump one signal if it has changed.
     // We do want to inline these to avoid calls when the value did not change.
     inline void chgBit(vluint32_t code, const vluint32_t newval) {
-        vluint32_t diff = oldp(code)[0] ^ newval;
+        const vluint32_t diff = oldp(code)[0] ^ newval;
         if (VL_UNLIKELY(diff)) fullBit(code, newval);
     }
     inline void chgBus(vluint32_t code, const vluint32_t newval, int bits) {
-        vluint32_t diff = oldp(code)[0] ^ newval;
+        const vluint32_t diff = oldp(code)[0] ^ newval;
         if (VL_UNLIKELY(diff)) {
             if (VL_UNLIKELY(bits == 32 || (diff & ((1U << bits) - 1)))) {
                 fullBus(code, newval, bits);
@@ -245,7 +245,7 @@ public:
         }
     }
     inline void chgQuad(vluint32_t code, const vluint64_t newval, int bits) {
-        vluint64_t diff = (*(reinterpret_cast<vluint64_t*>(oldp(code)))) ^ newval;
+        const vluint64_t diff = (*(reinterpret_cast<vluint64_t*>(oldp(code)))) ^ newval;
         if (VL_UNLIKELY(diff)) {
             if (VL_UNLIKELY(bits == 64 || (diff & ((1ULL << bits) - 1)))) {
                 fullQuad(code, newval, bits);
@@ -270,7 +270,7 @@ public:
         }
     }
     inline void chgTriBit(vluint32_t code, const vluint32_t newval, const vluint32_t newtri) {
-        vluint32_t diff = ((oldp(code)[0] ^ newval) | (oldp(code)[1] ^ newtri));
+        const vluint32_t diff = ((oldp(code)[0] ^ newval) | (oldp(code)[1] ^ newtri));
         if (VL_UNLIKELY(diff)) {
             // Verilator 3.510 and newer provide clean input, so the below
             // is only for back compatibility
@@ -281,7 +281,7 @@ public:
     }
     inline void chgTriBus(vluint32_t code, const vluint32_t newval, const vluint32_t newtri,
                           int bits) {
-        vluint32_t diff = ((oldp(code)[0] ^ newval) | (oldp(code)[1] ^ newtri));
+        const vluint32_t diff = ((oldp(code)[0] ^ newval) | (oldp(code)[1] ^ newtri));
         if (VL_UNLIKELY(diff)) {
             if (VL_UNLIKELY(bits == 32 || (diff & ((1U << bits) - 1)))) {
                 fullTriBus(code, newval, newtri, bits);
@@ -290,8 +290,8 @@ public:
     }
     inline void chgTriQuad(vluint32_t code, const vluint64_t newval, const vluint64_t newtri,
                            int bits) {
-        vluint64_t diff = (((*(reinterpret_cast<vluint64_t*>(oldp(code)))) ^ newval)
-                           | ((*(reinterpret_cast<vluint64_t*>(oldp(code + 1)))) ^ newtri));
+        const vluint64_t diff = (((*(reinterpret_cast<vluint64_t*>(oldp(code)))) ^ newval)
+                                 | ((*(reinterpret_cast<vluint64_t*>(oldp(code + 1)))) ^ newtri));
         if (VL_UNLIKELY(diff)) {
             if (VL_UNLIKELY(bits == 64 || (diff & ((1ULL << bits) - 1)))) {
                 fullTriQuad(code, newval, newtri, bits);
diff --git a/include/verilated_vcd_sc.h b/include/verilated_vcd_sc.h
index 415f1911c..de6e6d943 100644
--- a/include/verilated_vcd_sc.h
+++ b/include/verilated_vcd_sc.h
@@ -44,9 +44,9 @@ public:
         // We want to avoid a depreciated warning, but still be back compatible.
         // Turning off the message just for this still results in an
         // annoying "to turn off" message.
-        sc_time t1sec(1, SC_SEC);
+        const sc_time t1sec(1, SC_SEC);
         if (t1sec.to_default_time_units() != 0) {
-            sc_time tunits(1.0 / t1sec.to_default_time_units(), SC_SEC);
+            const sc_time tunits(1.0 / t1sec.to_default_time_units(), SC_SEC);
             spTrace()->set_time_unit(tunits.to_string());
         }
         spTrace()->set_time_resolution(sc_get_time_resolution().to_string());
diff --git a/include/verilated_vpi.cpp b/include/verilated_vpi.cpp
index d0f1178b5..eb9e254a3 100644
--- a/include/verilated_vpi.cpp
+++ b/include/verilated_vpi.cpp
@@ -310,7 +310,7 @@ public:
         return dynamic_cast<VerilatedVpioVar*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     vluint32_t mask() const { return m_mask.u32; }
-    vluint8_t mask_byte(int idx) { return m_mask.u8[idx & 3]; }
+    vluint8_t mask_byte(int idx) const { return m_mask.u8[idx & 3]; }
     vluint32_t entSize() const { return m_entSize; }
     vluint32_t index() const { return m_index; }
     virtual vluint32_t type() const override {
@@ -365,7 +365,7 @@ public:
     virtual vluint32_t type() const override { return vpiIterator; }
     virtual vpiHandle dovpi_scan() override {
         if (VL_LIKELY(m_scopep->varsp())) {
-            VerilatedVarNameMap* varsp = m_scopep->varsp();
+            const VerilatedVarNameMap* const varsp = m_scopep->varsp();
             if (VL_UNLIKELY(!m_started)) {
                 m_it = varsp->begin();
                 m_started = true;
@@ -564,7 +564,7 @@ public:
     }
     static void callTimedCbs() VL_MT_UNSAFE_ONE {
         assertOneCheck();
-        QData time = VL_TIME_Q();
+        const QData time = VL_TIME_Q();
         for (auto it = s().m_timedCbs.begin(); it != s().m_timedCbs.end();) {
             if (VL_UNLIKELY(it->first.first <= time)) {
                 VerilatedVpiCbHolder& ho = it->second;
@@ -587,7 +587,7 @@ public:
         if (VL_LIKELY(it != s().m_timedCbs.cend())) return it->first.first;
         return ~0ULL;  // maxquad
     }
-    static bool callCbs(vluint32_t reason) VL_MT_UNSAFE_ONE {
+    static bool callCbs(const vluint32_t reason) VL_MT_UNSAFE_ONE {
         VpioCbList& cbObjList = s().m_cbObjLists[reason];
         bool called = false;
         if (cbObjList.empty()) return called;
@@ -619,7 +619,7 @@ public:
         const auto last = std::prev(cbObjList.end());  // prevent looping over newly added elements
         for (auto it = cbObjList.begin(); true;) {
             // cbReasonRemove sets to nullptr, so we know on removal the old end() will still exist
-            bool was_last = it == last;
+            const bool was_last = it == last;
             if (VL_UNLIKELY(it->invalid())) {  // Deleted earlier, cleanup
                 it = cbObjList.erase(it);
                 if (was_last) break;
@@ -715,7 +715,7 @@ public:
     void resetError() { m_flag = false; }
     static void vpi_unsupported() {
         // Not supported yet
-        p_vpi_error_info error_info_p = VerilatedVpiImp::error_info()->getError();
+        const p_vpi_error_info error_info_p = VerilatedVpiImp::error_info()->getError();
         if (error_info_p) {
             VL_FATAL_MT(error_info_p->file, error_info_p->line, "", error_info_p->message);
             return;
@@ -1300,9 +1300,9 @@ vpiHandle vpi_register_cb(p_cb_data cb_data_p) {
     case cbAfterDelay: {
         QData time = 0;
         if (cb_data_p->time) time = VL_SET_QII(cb_data_p->time->high, cb_data_p->time->low);
-        QData abstime = VL_TIME_Q() + time;
+        const QData abstime = VL_TIME_Q() + time;
         vluint64_t id = VerilatedVpiImp::nextCallbackId();
-        VerilatedVpioTimedCb* vop = new VerilatedVpioTimedCb{id, abstime};
+        VerilatedVpioTimedCb* const vop = new VerilatedVpioTimedCb{id, abstime};
         VerilatedVpiImp::cbTimedAdd(id, cb_data_p, abstime);
         return vop->castVpiHandle();
     }
@@ -1316,8 +1316,8 @@ vpiHandle vpi_register_cb(p_cb_data cb_data_p) {
     case cbEnterInteractive:  // FALLTHRU // NOP, but need to return handle, so make object
     case cbExitInteractive:  // FALLTHRU // NOP, but need to return handle, so make object
     case cbInteractiveScopeChange: {  // FALLTHRU // NOP, but need to return handle, so make object
-        vluint64_t id = VerilatedVpiImp::nextCallbackId();
-        VerilatedVpioReasonCb* vop = new VerilatedVpioReasonCb{id, cb_data_p->reason};
+        const vluint64_t id = VerilatedVpiImp::nextCallbackId();
+        VerilatedVpioReasonCb* const vop = new VerilatedVpioReasonCb{id, cb_data_p->reason};
         VerilatedVpiImp::cbReasonAdd(id, cb_data_p);
         return vop->castVpiHandle();
     }
@@ -1332,7 +1332,7 @@ PLI_INT32 vpi_remove_cb(vpiHandle cb_obj) {
     VL_DEBUG_IF_PLI(VL_DBG_MSGF("- vpi: vpi_remove_cb %p\n", cb_obj););
     VerilatedVpiImp::assertOneCheck();
     VL_VPI_ERROR_RESET_();
-    VerilatedVpio* vop = VerilatedVpio::castp(cb_obj);
+    VerilatedVpio* const vop = VerilatedVpio::castp(cb_obj);
     if (VL_UNLIKELY(!vop)) return 0;
     return vop->dovpi_remove_cb();
 }
@@ -1355,7 +1355,7 @@ vpiHandle vpi_handle_by_name(PLI_BYTE8* namep, vpiHandle scope) {
     VL_DEBUG_IF_PLI(VL_DBG_MSGF("- vpi: vpi_handle_by_name %s %p\n", namep, scope););
     const VerilatedVar* varp = nullptr;
     const VerilatedScope* scopep;
-    VerilatedVpioScope* voScopep = VerilatedVpioScope::castp(scope);
+    const VerilatedVpioScope* const voScopep = VerilatedVpioScope::castp(scope);
     std::string scopeAndName = namep;
     if (voScopep) {
         scopeAndName = std::string(voScopep->fullname()) + "." + namep;
@@ -1373,7 +1373,7 @@ vpiHandle vpi_handle_by_name(PLI_BYTE8* namep, vpiHandle scope) {
         }
         const char* baseNamep = scopeAndName.c_str();
         std::string scopename;
-        const char* dotp = std::strrchr(namep, '.');
+        const char* const dotp = std::strrchr(namep, '.');
         if (VL_LIKELY(dotp)) {
             baseNamep = dotp + 1;
             scopename = std::string(namep, dotp - namep);
@@ -1407,7 +1407,7 @@ vpiHandle vpi_handle_by_index(vpiHandle object, PLI_INT32 indx) {
     // Memory words are not indexable
     VerilatedVpioMemoryWord* vop = VerilatedVpioMemoryWord::castp(object);
     if (VL_UNLIKELY(vop)) return nullptr;
-    VerilatedVpioVar* varop = VerilatedVpioVar::castp(object);
+    const VerilatedVpioVar* const varop = VerilatedVpioVar::castp(object);
     if (VL_LIKELY(varop)) {
         if (varop->varp()->dims() < 2) return nullptr;
         if (VL_LIKELY(varop->varp()->unpacked().left() >= varop->varp()->unpacked().right())) {
@@ -1496,7 +1496,7 @@ vpiHandle vpi_iterate(PLI_INT32 type, vpiHandle object) {
     VL_VPI_ERROR_RESET_();
     switch (type) {
     case vpiMemoryWord: {
-        VerilatedVpioVar* vop = VerilatedVpioVar::castp(object);
+        const VerilatedVpioVar* const vop = VerilatedVpioVar::castp(object);
         if (VL_UNLIKELY(!vop)) return nullptr;
         if (vop->varp()->dims() < 2) return nullptr;
         if (vop->varp()->dims() > 2) {
@@ -1508,7 +1508,7 @@ vpiHandle vpi_iterate(PLI_INT32 type, vpiHandle object) {
         return (new VerilatedVpioMemoryWordIter(object, vop->varp()))->castVpiHandle();
     }
     case vpiRange: {
-        VerilatedVpioVar* vop = VerilatedVpioVar::castp(object);
+        const VerilatedVpioVar* const vop = VerilatedVpioVar::castp(object);
         if (VL_UNLIKELY(!vop)) return nullptr;
         if (vop->varp()->dims() < 2) return nullptr;
         // Unsupported is multidim list
@@ -1521,15 +1521,15 @@ vpiHandle vpi_iterate(PLI_INT32 type, vpiHandle object) {
         return ((new VerilatedVpioRangeIter(vop->rangep()))->castVpiHandle());
     }
     case vpiReg: {
-        VerilatedVpioScope* vop = VerilatedVpioScope::castp(object);
+        const VerilatedVpioScope* const vop = VerilatedVpioScope::castp(object);
         if (VL_UNLIKELY(!vop)) return nullptr;
         return ((new VerilatedVpioVarIter(vop->scopep()))->castVpiHandle());
     }
     case vpiModule: {
-        VerilatedVpioModule* vop = VerilatedVpioModule::castp(object);
-        const VerilatedHierarchyMap* map = VerilatedImp::hierarchyMap();
-        const VerilatedScope* mod = vop ? vop->scopep() : nullptr;
-        const auto it = vlstd::as_const(map)->find(const_cast<VerilatedScope*>(mod));
+        const VerilatedVpioModule* const vop = VerilatedVpioModule::castp(object);
+        const VerilatedHierarchyMap* const map = VerilatedImp::hierarchyMap();
+        const VerilatedScope* const modp = vop ? vop->scopep() : nullptr;
+        const auto it = vlstd::as_const(map)->find(const_cast<VerilatedScope*>(modp));
         if (it == map->end()) return nullptr;
         return ((new VerilatedVpioModuleIter(it->second))->castVpiHandle());
     }
@@ -1560,30 +1560,30 @@ PLI_INT32 vpi_get(PLI_INT32 property, vpiHandle object) {
         return Verilated::threadContextp()->timeprecision();
     }
     case vpiTimeUnit: {
-        VerilatedVpioScope* vop = VerilatedVpioScope::castp(object);
+        const VerilatedVpioScope* const vop = VerilatedVpioScope::castp(object);
         if (!vop)
             return Verilated::threadContextp()->timeunit();  // Null asks for global, not unlikely
         return vop->scopep()->timeunit();
     }
     case vpiType: {
-        VerilatedVpio* vop = VerilatedVpio::castp(object);
+        const VerilatedVpio* const vop = VerilatedVpio::castp(object);
         if (VL_UNLIKELY(!vop)) return 0;
         return vop->type();
     }
     case vpiDirection: {
         // By forthought, the directions already are vpi enumerated
-        VerilatedVpioVarBase* vop = VerilatedVpioVarBase::castp(object);
+        const VerilatedVpioVarBase* const vop = VerilatedVpioVarBase::castp(object);
         if (VL_UNLIKELY(!vop)) return 0;
         return vop->varp()->vldir();
     }
     case vpiScalar:  // FALLTHRU
     case vpiVector: {
-        VerilatedVpioVarBase* vop = VerilatedVpioVarBase::castp(object);
+        const VerilatedVpioVarBase* const vop = VerilatedVpioVarBase::castp(object);
         if (VL_UNLIKELY(!vop)) return 0;
         return (property == vpiVector) ^ (vop->varp()->dims() == 0);
     }
     case vpiSize: {
-        VerilatedVpioVarBase* vop = VerilatedVpioVarBase::castp(object);
+        const VerilatedVpioVarBase* const vop = VerilatedVpioVarBase::castp(object);
         if (VL_UNLIKELY(!vop)) return 0;
         return vop->size();
     }
@@ -1602,7 +1602,7 @@ PLI_INT64 vpi_get64(PLI_INT32 /*property*/, vpiHandle /*object*/) {
 PLI_BYTE8* vpi_get_str(PLI_INT32 property, vpiHandle object) {
     VL_DEBUG_IF_PLI(VL_DBG_MSGF("- vpi: vpi_get_str %d %p\n", property, object););
     VerilatedVpiImp::assertOneCheck();
-    VerilatedVpio* vop = VerilatedVpio::castp(object);
+    const VerilatedVpio* const vop = VerilatedVpio::castp(object);
     VL_VPI_ERROR_RESET_();
     if (VL_UNLIKELY(!vop)) return nullptr;
     switch (property) {
@@ -1725,7 +1725,7 @@ void vl_get_value(const VerilatedVar* varp, void* varDatap, p_vpi_value valuep,
                     __FILE__, __LINE__, "",
                     "vpi_get_value with more than VL_MULS_MAX_WORDS; increase and recompile");
             }
-            WDataInP datap = (reinterpret_cast<EData*>(varDatap));
+            const WDataInP datap = (reinterpret_cast<EData*>(varDatap));
             for (int i = 0; i < words; ++i) {
                 t_out[i].aval = datap[i];
                 t_out[i].bval = 0;
@@ -1756,7 +1756,7 @@ void vl_get_value(const VerilatedVar* varp, void* varDatap, p_vpi_value valuep,
     } else if (valuep->format == vpiOctStrVal) {
         valuep->value.str = t_outStr;
         int chars = (varp->packed().elements() + 2) / 3;
-        int bytes = VL_BYTES_I(varp->packed().elements());
+        const int bytes = VL_BYTES_I(varp->packed().elements());
         CData* datap = (reinterpret_cast<CData*>(varDatap));
         int i;
         if (chars > t_outStrSz) {
@@ -1770,7 +1770,7 @@ void vl_get_value(const VerilatedVar* varp, void* varDatap, p_vpi_value valuep,
             chars = t_outStrSz;
         }
         for (i = 0; i < chars; ++i) {
-            div_t idx = div(i * 3, 8);
+            const div_t idx = div(i * 3, 8);
             int val = datap[idx.quot];
             if ((idx.quot + 1) < bytes) {
                 // if the next byte is valid or that in
@@ -1832,7 +1832,7 @@ void vl_get_value(const VerilatedVar* varp, void* varDatap, p_vpi_value valuep,
             if (i == (chars - 1)) {
                 // most signifcant char, mask off non existant bits when vector
                 // size is not a multiple of 4
-                unsigned int rem = varp->packed().elements() & 3;
+                const unsigned int rem = varp->packed().elements() & 3;
                 if (rem) {
                     // generate bit mask & zero non existant bits
                     val &= (1 << rem) - 1;
@@ -1862,7 +1862,7 @@ void vl_get_value(const VerilatedVar* varp, void* varDatap, p_vpi_value valuep,
                 bytes = t_outStrSz;
             }
             for (i = 0; i < bytes; ++i) {
-                char val = datap[bytes - i - 1];
+                const char val = datap[bytes - i - 1];
                 // other simulators replace [leading?] zero chars with spaces, replicate here.
                 t_outStr[i] = val ? val : ' ';
             }
@@ -1896,7 +1896,7 @@ void vpi_get_value(vpiHandle object, p_vpi_value valuep) {
     if (VerilatedVpioVar* vop = VerilatedVpioVar::castp(object)) {
         vl_get_value(vop->varp(), vop->varDatap(), valuep, vop->fullname());
         return;
-    } else if (VerilatedVpioParam* vop = VerilatedVpioParam::castp(object)) {
+    } else if (const VerilatedVpioParam* const vop = VerilatedVpioParam::castp(object)) {
         vl_get_value(vop->varp(), vop->varDatap(), valuep, vop->fullname());
         return;
     } else if (VerilatedVpioConst* vop = VerilatedVpioConst::castp(object)) {
@@ -1920,7 +1920,7 @@ vpiHandle vpi_put_value(vpiHandle object, p_vpi_value valuep, p_vpi_time /*time_
         VL_VPI_WARNING_(__FILE__, __LINE__, "Ignoring vpi_put_value with nullptr value pointer");
         return nullptr;
     }
-    if (VerilatedVpioVar* vop = VerilatedVpioVar::castp(object)) {
+    if (const VerilatedVpioVar* const vop = VerilatedVpioVar::castp(object)) {
         VL_DEBUG_IF_PLI(
             VL_DBG_MSGF("- vpi:   vpi_put_value name=%s fmt=%d vali=%d\n", vop->fullname(),
                         valuep->format, valuep->value.integer);
@@ -1953,7 +1953,7 @@ vpiHandle vpi_put_value(vpiHandle object, p_vpi_value valuep, p_vpi_time /*time_
                     valuep->value.vector[1].aval & vop->mask(), valuep->value.vector[0].aval);
                 return object;
             } else if (vop->varp()->vltype() == VLVT_WDATA) {
-                int words = VL_WORDS_I(vop->varp()->packed().elements());
+                const int words = VL_WORDS_I(vop->varp()->packed().elements());
                 WDataOutP datap = (reinterpret_cast<EData*>(vop->varDatap()));
                 for (int i = 0; i < words; ++i) {
                     datap[i] = valuep->value.vector[i].aval;
@@ -1962,8 +1962,8 @@ vpiHandle vpi_put_value(vpiHandle object, p_vpi_value valuep, p_vpi_time /*time_
                 return object;
             }
         } else if (valuep->format == vpiBinStrVal) {
-            int bits = vop->varp()->packed().elements();
-            int len = std::strlen(valuep->value.str);
+            const int bits = vop->varp()->packed().elements();
+            const int len = std::strlen(valuep->value.str);
             CData* datap = (reinterpret_cast<CData*>(vop->varDatap()));
             for (int i = 0; i < bits; ++i) {
                 char set = (i < len) ? (valuep->value.str[len - i - 1] == '1') : 0;
@@ -1977,9 +1977,9 @@ vpiHandle vpi_put_value(vpiHandle object, p_vpi_value valuep, p_vpi_time /*time_
             }
             return object;
         } else if (valuep->format == vpiOctStrVal) {
-            int chars = (vop->varp()->packed().elements() + 2) / 3;
-            int bytes = VL_BYTES_I(vop->varp()->packed().elements());
-            int len = std::strlen(valuep->value.str);
+            const int chars = (vop->varp()->packed().elements() + 2) / 3;
+            const int bytes = VL_BYTES_I(vop->varp()->packed().elements());
+            const int len = std::strlen(valuep->value.str);
             CData* datap = (reinterpret_cast<CData*>(vop->varDatap()));
             div_t idx;
             datap[0] = 0;  // reset zero'th byte
@@ -2029,7 +2029,7 @@ vpiHandle vpi_put_value(vpiHandle object, p_vpi_value valuep, p_vpi_time /*time_
         } else if (valuep->format == vpiDecStrVal) {
             char remainder[16];
             unsigned long long val;
-            int success = std::sscanf(valuep->value.str, "%30llu%15s", &val, remainder);
+            const int success = std::sscanf(valuep->value.str, "%30llu%15s", &val, remainder);
             if (success < 1) {
                 VL_VPI_ERROR_(__FILE__, __LINE__, "%s: Parsing failed for '%s' as value %s for %s",
                               __func__, valuep->value.str,
@@ -2057,12 +2057,12 @@ vpiHandle vpi_put_value(vpiHandle object, p_vpi_value valuep, p_vpi_time /*time_
                 return object;
             }
         } else if (valuep->format == vpiHexStrVal) {
-            int chars = (vop->varp()->packed().elements() + 3) >> 2;
+            const int chars = (vop->varp()->packed().elements() + 3) >> 2;
             CData* datap = (reinterpret_cast<CData*>(vop->varDatap()));
             char* val = valuep->value.str;
             // skip hex ident if one is detected at the start of the string
             if (val[0] == '0' && (val[1] == 'x' || val[1] == 'X')) val += 2;
-            int len = std::strlen(val);
+            const int len = std::strlen(val);
             for (int i = 0; i < chars; ++i) {
                 char hex;
                 // compute hex digit value
@@ -2097,8 +2097,8 @@ vpiHandle vpi_put_value(vpiHandle object, p_vpi_value valuep, p_vpi_time /*time_
             datap[(chars - 1) >> 1] &= vop->mask_byte((chars - 1) >> 1);
             return object;
         } else if (valuep->format == vpiStringVal) {
-            int bytes = VL_BYTES_I(vop->varp()->packed().elements());
-            int len = std::strlen(valuep->value.str);
+            const int bytes = VL_BYTES_I(vop->varp()->packed().elements());
+            const int len = std::strlen(valuep->value.str);
             CData* datap = (reinterpret_cast<CData*>(vop->varDatap()));
             for (int i = 0; i < bytes; ++i) {
                 // prepend with 0 values before placing string the least significant bytes
@@ -2120,11 +2120,11 @@ vpiHandle vpi_put_value(vpiHandle object, p_vpi_value valuep, p_vpi_time /*time_
         VL_VPI_ERROR_(__FILE__, __LINE__, "%s: Unsupported format (%s) as requested for %s",
                       __func__, VerilatedVpiError::strFromVpiVal(valuep->format), vop->fullname());
         return nullptr;
-    } else if (VerilatedVpioParam* vop = VerilatedVpioParam::castp(object)) {
+    } else if (const VerilatedVpioParam* const vop = VerilatedVpioParam::castp(object)) {
         VL_VPI_WARNING_(__FILE__, __LINE__, "%s: Ignoring vpi_put_value to vpiParameter: %s",
                         __func__, vop->fullname());
         return nullptr;
-    } else if (VerilatedVpioConst* vop = VerilatedVpioConst::castp(object)) {
+    } else if (const VerilatedVpioConst* const vop = VerilatedVpioConst::castp(object)) {
         VL_VPI_WARNING_(__FILE__, __LINE__, "%s: Ignoring vpi_put_value to vpiConstant: %s",
                         __func__, vop->fullname());
         return nullptr;
@@ -2153,7 +2153,7 @@ void vpi_get_time(vpiHandle object, p_vpi_time time_p) {
         return;
     }
     if (time_p->type == vpiSimTime) {
-        QData qtime = VL_TIME_Q();
+        const QData qtime = VL_TIME_Q();
         VlWide<2> itime;
         VL_SET_WQ(itime, qtime);
         time_p->low = itime[0];
@@ -2162,9 +2162,9 @@ void vpi_get_time(vpiHandle object, p_vpi_time time_p) {
     } else if (time_p->type == vpiScaledRealTime) {
         double dtime = VL_TIME_D();
         if (VerilatedVpioScope* vop = VerilatedVpioScope::castp(object)) {
-            int scalePow10
+            const int scalePow10
                 = Verilated::threadContextp()->timeprecision() - vop->scopep()->timeunit();
-            double scale = vl_time_multiplier(scalePow10);  // e.g. 0.0001
+            const double scale = vl_time_multiplier(scalePow10);  // e.g. 0.0001
             dtime *= scale;
         }
         time_p->real = dtime;
@@ -2198,7 +2198,7 @@ PLI_INT32 vpi_mcd_printf(PLI_UINT32 mcd, PLI_BYTE8* formatp, ...) {
     VL_VPI_ERROR_RESET_();
     va_list ap;
     va_start(ap, formatp);
-    int chars = vpi_mcd_vprintf(mcd, formatp, ap);
+    const int chars = vpi_mcd_vprintf(mcd, formatp, ap);
     va_end(ap);
     return chars;
 }
@@ -2208,7 +2208,7 @@ PLI_INT32 vpi_printf(PLI_BYTE8* formatp, ...) {
     VL_VPI_ERROR_RESET_();
     va_list ap;
     va_start(ap, formatp);
-    int chars = vpi_vprintf(formatp, ap);
+    const int chars = vpi_vprintf(formatp, ap);
     va_end(ap);
     return chars;
 }
@@ -2221,11 +2221,11 @@ PLI_INT32 vpi_vprintf(PLI_BYTE8* formatp, va_list ap) {
 
 PLI_INT32 vpi_mcd_vprintf(PLI_UINT32 mcd, PLI_BYTE8* format, va_list ap) {
     VerilatedVpiImp::assertOneCheck();
-    FILE* fp = VL_CVT_I_FP(mcd);
+    FILE* const fp = VL_CVT_I_FP(mcd);
     VL_VPI_ERROR_RESET_();
     // cppcheck-suppress nullPointer
     if (VL_UNLIKELY(!fp)) return 0;
-    int chars = vfprintf(fp, format, ap);
+    const int chars = vfprintf(fp, format, ap);
     return chars;
 }
 
@@ -2238,7 +2238,7 @@ PLI_INT32 vpi_flush(void) {
 
 PLI_INT32 vpi_mcd_flush(PLI_UINT32 mcd) {
     VerilatedVpiImp::assertOneCheck();
-    FILE* fp = VL_CVT_I_FP(mcd);
+    FILE* const fp = VL_CVT_I_FP(mcd);
     VL_VPI_ERROR_RESET_();
     if (VL_UNLIKELY(!fp)) return 1;
     std::fflush(fp);
@@ -2255,7 +2255,7 @@ PLI_INT32 vpi_chk_error(p_vpi_error_info error_info_p) {
     // executing vpi_chk_error does not reset error
     // error_info_p can be nullptr, so only return level in that case
     VerilatedVpiImp::assertOneCheck();
-    p_vpi_error_info _error_info_p = VerilatedVpiImp::error_info()->getError();
+    p_vpi_error_info const _error_info_p = VerilatedVpiImp::error_info()->getError();
     if (error_info_p && _error_info_p) *error_info_p = *_error_info_p;
     if (!_error_info_p) return 0;  // no error occured
     return _error_info_p->level;  // return error severity level
diff --git a/include/verilated_vpi.h b/include/verilated_vpi.h
index 1d1e9d4ce..9f8f8f90d 100644
--- a/include/verilated_vpi.h
+++ b/include/verilated_vpi.h
@@ -47,7 +47,7 @@ public:
     static bool callValueCbs() VL_MT_UNSAFE_ONE;
     /// Call callbacks of arbitrary types.
     /// User wrapper code should call this from their main loops.
-    static bool callCbs(vluint32_t reason) VL_MT_UNSAFE_ONE;
+    static bool callCbs(const vluint32_t reason) VL_MT_UNSAFE_ONE;
     /// Returns time of the next registered VPI callback, or
     /// ~(0ULL) if none are registered
     static QData cbNextDeadline() VL_MT_UNSAFE_ONE;

From 8d737271cac98e192bb87a1ea6877718ac952994 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Sat, 19 Jun 2021 10:00:31 -0400
Subject: [PATCH 37/73] Allow configure override of AR program (#2999).

---
 Changes                 | 1 +
 configure.ac            | 5 +++++
 include/verilated.mk.in | 7 +++----
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/Changes b/Changes
index a626dd4cc..25eac6207 100644
--- a/Changes
+++ b/Changes
@@ -21,6 +21,7 @@ Verilator 4.205 devel
 * Optimize a lot more model variables into function locals (#3027). [Geza Lore]
 * Remove deprecated --no-relative-cfuncs option (#3024). [Geza Lore]
 * Merge const static data globally into a new constant pool (#3013). [Geza Lore]
+* Allow configure override of AR program (#2999). [ahouska]
 * Fix error on unsupported recursive functions (#2957). [Trefor Southwell]
 
 
diff --git a/configure.ac b/configure.ac
index c111cecc1..d20a7c567 100644
--- a/configure.ac
+++ b/configure.ac
@@ -163,6 +163,11 @@ AC_RUN_IFELSE(
     AC_MSG_RESULT(no);AC_MSG_ERROR([a working C++ compiler is required]),
     AC_MSG_RESULT(yes))
 
+AC_CHECK_PROG(AR,ar,ar)
+if test "x$AR" = "x" ; then
+   AC_MSG_ERROR([Cannot find "ar" in your PATH, please install it])
+fi
+
 AC_PATH_PROG(PERL,perl)
 if test "x$PERL" = "x" ; then
    AC_MSG_ERROR([Cannot find "perl" in your PATH, please install it])
diff --git a/include/verilated.mk.in b/include/verilated.mk.in
index bc543442b..d11a75745 100644
--- a/include/verilated.mk.in
+++ b/include/verilated.mk.in
@@ -9,13 +9,12 @@
 # SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 ######################################################################
 
-PERL = @PERL@
-PYTHON3 = @PYTHON3@
+AR = @AR@
 CXX = @CXX@
 LINK = @CXX@
-AR = ar
-RANLIB = ranlib
 OBJCACHE ?= @OBJCACHE@
+PERL = @PERL@
+PYTHON3 = @PYTHON3@
 
 CFG_WITH_CCWARN = @CFG_WITH_CCWARN@
 CFG_WITH_LONGTESTS = @CFG_WITH_LONGTESTS@

From eebda248c7c0f7691d8d5616c0aaf758ae6de44e Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sat, 19 Jun 2021 14:40:31 +0100
Subject: [PATCH 38/73] Internals: Use AstUserAllocator in V3Order

---
 src/V3Order.cpp | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/src/V3Order.cpp b/src/V3Order.cpp
index df9787a11..d2df50e84 100644
--- a/src/V3Order.cpp
+++ b/src/V3Order.cpp
@@ -80,6 +80,7 @@
 #include "verilatedos.h"
 
 #include "V3Ast.h"
+#include "V3AstUserAllocator.h"
 #include "V3Const.h"
 #include "V3EmitCBase.h"
 #include "V3EmitV.h"
@@ -640,7 +641,7 @@ private:
     // NODE STATE
     // Forming graph:
     //   Entire Netlist:
-    //    AstVarScope::user1p   -> OrderUser* for usage var
+    //    AstVarScope::user1u   -> OrderUser* for usage var (via m_orderUser)
     //    {statement}Node::user1p-> AstModule* statement is under
     //   USER4 Cleared on each Logic stmt
     //    AstVarScope::user4()  -> VarUsage(gen/con/both).      Where already encountered signal
@@ -654,6 +655,8 @@ private:
     AstUser3InUse m_inuser3;
     // AstUser4InUse     m_inuser4;      // Used only when building tree, so below
 
+    AstUser1Allocator<AstVarScope, OrderUser> m_orderUser;
+
     // STATE
     OrderGraph m_graph;  // Scoreboard of var usages/dependencies
     SenTreeFinder m_finder;  // Find global sentree's and add them
@@ -673,7 +676,6 @@ private:
     bool m_inPost = false;  // Underneath AstAssignPost
     bool m_inPostponed = false;  // Underneath AstAssignPostponed
     OrderLogicVertex* m_activeSenVxp = nullptr;  // Sensitivity vertex
-    std::deque<OrderUser*> m_orderUserps;  // All created OrderUser's for later deletion.
     // STATE... for inside process
     AstCFunc* m_pomNewFuncp = nullptr;  // Current function being created
     int m_pomNewStmts = 0;  // Statements in function being created
@@ -717,14 +719,7 @@ private:
 
     OrderVarVertex* newVarUserVertex(AstVarScope* varscp, WhichVertex type,
                                      bool* createdp = nullptr) {
-        if (!varscp->user1p()) {
-            OrderUser* newup = new OrderUser();
-            m_orderUserps.push_back(newup);
-            varscp->user1p(newup);
-        }
-        OrderUser* up = reinterpret_cast<OrderUser*>(varscp->user1p());
-        OrderVarVertex* varVxp = up->newVarUserVertex(&m_graph, m_scopep, varscp, type, createdp);
-        return varVxp;
+        return m_orderUser(varscp).newVarUserVertex(&m_graph, m_scopep, varscp, type, createdp);
     }
 
     void process();
@@ -1232,7 +1227,6 @@ public:
             }
         }
         // Destruction
-        for (OrderUser* ip : m_orderUserps) delete ip;
         m_graph.debug(V3Error::debugDefault());
     }
     void main(AstNode* nodep) { iterate(nodep); }

From c11cd18491a8e82cfc1b2390a5ebe8ee08e779aa Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Sat, 19 Jun 2021 13:41:19 -0400
Subject: [PATCH 39/73] In XML, show pinIndex information (#2877).

---
 Changes                                     |  1 +
 src/V3AstNodes.h                            |  9 +++--
 src/V3EmitXml.cpp                           |  1 +
 src/V3LinkDot.cpp                           |  1 +
 test_regress/t/t_clk_concat.pl              |  6 ++--
 test_regress/t/t_clk_concat_vlt.pl          |  8 ++---
 test_regress/t/t_var_port_xml.out           | 40 ++++++++++-----------
 test_regress/t/t_xml_first.out              | 18 +++++-----
 test_regress/t/t_xml_flat.out               |  6 ++--
 test_regress/t/t_xml_flat_no_inline_mod.out |  2 +-
 test_regress/t/t_xml_flat_pub_mod.out       |  2 +-
 test_regress/t/t_xml_flat_vlvbound.out      |  8 ++---
 test_regress/t/t_xml_output.out             |  2 +-
 test_regress/t/t_xml_tag.out                |  6 ++--
 14 files changed, 58 insertions(+), 52 deletions(-)

diff --git a/Changes b/Changes
index 25eac6207..e3d23ce0c 100644
--- a/Changes
+++ b/Changes
@@ -22,6 +22,7 @@ Verilator 4.205 devel
 * Remove deprecated --no-relative-cfuncs option (#3024). [Geza Lore]
 * Merge const static data globally into a new constant pool (#3013). [Geza Lore]
 * Allow configure override of AR program (#2999). [ahouska]
+* In XML, show pinIndex information (#2877). [errae233]
 * Fix error on unsupported recursive functions (#2957). [Trefor Southwell]
 
 
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index 94ef71ce3..d47a2aa52 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -1889,6 +1889,10 @@ private:
     VDirection m_direction;  // Direction input/output etc
     VDirection m_declDirection;  // Declared direction input/output etc
     AstBasicDTypeKwd m_declKwd;  // Keyword at declaration time
+    VLifetime m_lifetime;  // Lifetime
+    VVarAttrClocker m_attrClocker;
+    MTaskIdSet m_mtaskIds;  // MTaskID's that read or write this var
+    int m_pinNum = 0;  // For XML, if non-zero the connection pin number
     bool m_ansi : 1;  // ANSI port list variable (for dedup check)
     bool m_declTyped : 1;  // Declared as type (for dedup check)
     bool m_tristate : 1;  // Inout or triwire or trireg
@@ -1925,9 +1929,6 @@ private:
     bool m_overridenParam : 1;  // Overridden parameter by #(...) or defparam
     bool m_trace : 1;  // Trace this variable
     bool m_isLatched : 1;  // Not assigned in all control paths of combo always
-    VLifetime m_lifetime;  // Lifetime
-    VVarAttrClocker m_attrClocker;
-    MTaskIdSet m_mtaskIds;  // MTaskID's that read or write this var
 
     void init() {
         m_ansi = false;
@@ -2226,6 +2227,8 @@ public:
     void addProducingMTaskId(int id) { m_mtaskIds.insert(id); }
     void addConsumingMTaskId(int id) { m_mtaskIds.insert(id); }
     const MTaskIdSet& mtaskIds() const { return m_mtaskIds; }
+    void pinNum(int id) { m_pinNum = id; }
+    int pinNum() const { return m_pinNum; }
 };
 
 class AstDefParam final : public AstNode {
diff --git a/src/V3EmitXml.cpp b/src/V3EmitXml.cpp
index 3b452ef15..ebe61b2e2 100644
--- a/src/V3EmitXml.cpp
+++ b/src/V3EmitXml.cpp
@@ -136,6 +136,7 @@ class EmitXmlFileVisitor final : public AstNVisitor {
         if (nodep->isIO()) {
             puts(" dir=");
             putsQuoted(kw);
+            if (nodep->pinNum() != 0) puts(" pinIndex=\"" + cvtToStr(nodep->pinNum()) + "\"");
             puts(" vartype=");
             putsQuoted(!vt.empty() ? vt : typ == AstVarType::PORT ? "port" : "unknown");
         } else {
diff --git a/src/V3LinkDot.cpp b/src/V3LinkDot.cpp
index 05469e928..4fc0dff4a 100644
--- a/src/V3LinkDot.cpp
+++ b/src/V3LinkDot.cpp
@@ -1438,6 +1438,7 @@ private:
                                                 "__pinNumber" + cvtToStr(nodep->pinNum()), refp,
                                                 nullptr /*classOrPackagep*/);
             symp->exported(false);
+            refp->pinNum(nodep->pinNum());
         }
         // Ports not needed any more
         VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
diff --git a/test_regress/t/t_clk_concat.pl b/test_regress/t/t_clk_concat.pl
index 20e02184d..cebae1cb9 100755
--- a/test_regress/t/t_clk_concat.pl
+++ b/test_regress/t/t_clk_concat.pl
@@ -17,9 +17,9 @@ compile(
     );
 
 if ($Self->{vlt_all}) {
-    file_grep("$out_filename", qr/\<var fl="d74" loc=".*?" name="clk0" dtype_id="1" dir="input" vartype="logic" origName="clk0" clocker="true" public="true"\/\>/i);
-    file_grep("$out_filename", qr/\<var fl="d75" loc=".*?" name="clk1" dtype_id="1" dir="input" vartype="logic" origName="clk1" clocker="true" public="true"\/\>/i);
-    file_grep("$out_filename", qr/\<var fl="d76" loc=".*?" name="clk2" dtype_id="1" dir="input" vartype="logic" origName="clk2" clocker="true" public="true"\/\>/i);
+    file_grep("$out_filename", qr/\<var fl="d74" loc=".*?" name="clk0" .*dir="input" .*vartype="logic" origName="clk0" clocker="true" public="true"\/\>/i);
+    file_grep("$out_filename", qr/\<var fl="d75" loc=".*?" name="clk1" .*dir="input" .*vartype="logic" origName="clk1" clocker="true" public="true"\/\>/i);
+    file_grep("$out_filename", qr/\<var fl="d76" loc=".*?" name="clk2" .*dir="input" .*vartype="logic" origName="clk2" clocker="true" public="true"\/\>/i);
 }
 
 execute(
diff --git a/test_regress/t/t_clk_concat_vlt.pl b/test_regress/t/t_clk_concat_vlt.pl
index 4aae842ef..9808ed638 100755
--- a/test_regress/t/t_clk_concat_vlt.pl
+++ b/test_regress/t/t_clk_concat_vlt.pl
@@ -18,10 +18,10 @@ compile(
     );
 
 if ($Self->{vlt_all}) {
-    file_grep("$out_filename", qr/\<var fl="e78" loc=".*?" name="clk0" dtype_id="1" dir="input" vartype="logic" origName="clk0" clocker="true" public="true"\/\>/i);
-    file_grep("$out_filename", qr/\<var fl="e79" loc=".*?" name="clk1" dtype_id="1" dir="input" vartype="logic" origName="clk1" clocker="true" public="true"\/\>/i);
-    file_grep("$out_filename", qr/\<var fl="e80" loc=".*?" name="clk2" dtype_id="1" dir="input" vartype="logic" origName="clk2" clocker="true" public="true"\/\>/i);
-    file_grep("$out_filename", qr/\<var fl="e82" loc=".*?" name="data_in" dtype_id="1" dir="input" vartype="logic" origName="data_in" clocker="false" public="true"\/\>/i);
+    file_grep("$out_filename", qr/\<var fl="e78" loc=".*?" name="clk0" .*dir="input" .*vartype="logic" origName="clk0" clocker="true" public="true"\/\>/i);
+    file_grep("$out_filename", qr/\<var fl="e79" loc=".*?" name="clk1" .*dir="input" .*vartype="logic" origName="clk1" clocker="true" public="true"\/\>/i);
+    file_grep("$out_filename", qr/\<var fl="e80" loc=".*?" name="clk2" .*dir="input" .*vartype="logic" origName="clk2" clocker="true" public="true"\/\>/i);
+    file_grep("$out_filename", qr/\<var fl="e82" loc=".*?" name="data_in" .*dir="input" .*vartype="logic" origName="data_in" clocker="false" public="true"\/\>/i);
 }
 
 execute(
diff --git a/test_regress/t/t_var_port_xml.out b/test_regress/t/t_var_port_xml.out
index b2e6f9f4f..bf16c637b 100644
--- a/test_regress/t/t_var_port_xml.out
+++ b/test_regress/t/t_var_port_xml.out
@@ -57,54 +57,54 @@
   </cells>
   <netlist>
     <module fl="d18" loc="d,18,8,18,11" name="mh2" origName="mh2">
-      <var fl="d18" loc="d,18,27,18,47" name="x_inout_wire_integer" dtype_id="1" dir="inout" vartype="integer" origName="x_inout_wire_integer"/>
+      <var fl="d18" loc="d,18,27,18,47" name="x_inout_wire_integer" dtype_id="1" dir="inout" pinIndex="1" vartype="integer" origName="x_inout_wire_integer"/>
     </module>
     <module fl="d24" loc="d,24,8,24,11" name="mh5" origName="mh5">
-      <var fl="d24" loc="d,24,19,24,37" name="x_input_wire_logic" dtype_id="2" dir="input" vartype="logic" origName="x_input_wire_logic"/>
+      <var fl="d24" loc="d,24,19,24,37" name="x_input_wire_logic" dtype_id="2" dir="input" pinIndex="1" vartype="logic" origName="x_input_wire_logic"/>
     </module>
     <module fl="d26" loc="d,26,8,26,11" name="mh6" origName="mh6">
-      <var fl="d26" loc="d,26,23,26,40" name="x_input_var_logic" dtype_id="2" dir="input" vartype="logic" origName="x_input_var_logic"/>
+      <var fl="d26" loc="d,26,23,26,40" name="x_input_var_logic" dtype_id="2" dir="input" pinIndex="1" vartype="logic" origName="x_input_var_logic"/>
     </module>
     <module fl="d28" loc="d,28,8,28,11" name="mh7" origName="mh7">
-      <var fl="d28" loc="d,28,31,28,50" name="x_input_var_integer" dtype_id="1" dir="input" vartype="integer" origName="x_input_var_integer"/>
+      <var fl="d28" loc="d,28,31,28,50" name="x_input_var_integer" dtype_id="1" dir="input" pinIndex="1" vartype="integer" origName="x_input_var_integer"/>
     </module>
     <module fl="d30" loc="d,30,8,30,11" name="mh8" origName="mh8">
-      <var fl="d30" loc="d,30,20,30,39" name="x_output_wire_logic" dtype_id="2" dir="output" vartype="logic" origName="x_output_wire_logic"/>
+      <var fl="d30" loc="d,30,20,30,39" name="x_output_wire_logic" dtype_id="2" dir="output" pinIndex="1" vartype="logic" origName="x_output_wire_logic"/>
     </module>
     <module fl="d32" loc="d,32,8,32,11" name="mh9" origName="mh9">
-      <var fl="d32" loc="d,32,24,32,42" name="x_output_var_logic" dtype_id="2" dir="output" vartype="logic" origName="x_output_var_logic"/>
+      <var fl="d32" loc="d,32,24,32,42" name="x_output_var_logic" dtype_id="2" dir="output" pinIndex="1" vartype="logic" origName="x_output_var_logic"/>
     </module>
     <module fl="d34" loc="d,34,8,34,12" name="mh10" origName="mh10">
-      <var fl="d34" loc="d,34,33,34,62" name="x_output_wire_logic_signed_p6" dtype_id="3" dir="output" vartype="logic" origName="x_output_wire_logic_signed_p6"/>
+      <var fl="d34" loc="d,34,33,34,62" name="x_output_wire_logic_signed_p6" dtype_id="3" dir="output" pinIndex="1" vartype="logic" origName="x_output_wire_logic_signed_p6"/>
     </module>
     <module fl="d36" loc="d,36,8,36,12" name="mh11" origName="mh11">
-      <var fl="d36" loc="d,36,28,36,48" name="x_output_var_integer" dtype_id="1" dir="output" vartype="integer" origName="x_output_var_integer"/>
+      <var fl="d36" loc="d,36,28,36,48" name="x_output_var_integer" dtype_id="1" dir="output" pinIndex="1" vartype="integer" origName="x_output_var_integer"/>
     </module>
     <module fl="d38" loc="d,38,8,38,12" name="mh12" origName="mh12">
-      <var fl="d38" loc="d,38,23,38,37" name="x_ref_logic_p6" dtype_id="4" dir="ref" vartype="logic" origName="x_ref_logic_p6"/>
+      <var fl="d38" loc="d,38,23,38,37" name="x_ref_logic_p6" dtype_id="4" dir="ref" pinIndex="1" vartype="logic" origName="x_ref_logic_p6"/>
     </module>
     <module fl="d40" loc="d,40,8,40,12" name="mh13" origName="mh13">
-      <var fl="d40" loc="d,40,17,40,35" name="x_ref_var_logic_u6" dtype_id="5" dir="ref" vartype="port" origName="x_ref_var_logic_u6"/>
+      <var fl="d40" loc="d,40,17,40,35" name="x_ref_var_logic_u6" dtype_id="5" dir="ref" pinIndex="1" vartype="port" origName="x_ref_var_logic_u6"/>
     </module>
     <module fl="d50" loc="d,50,8,50,12" name="mh17" origName="mh17">
-      <var fl="d50" loc="d,50,31,50,50" name="x_input_var_integer" dtype_id="1" dir="input" vartype="integer" origName="x_input_var_integer"/>
-      <var fl="d50" loc="d,50,57,50,75" name="y_input_wire_logic" dtype_id="2" dir="input" vartype="logic" origName="y_input_wire_logic"/>
+      <var fl="d50" loc="d,50,31,50,50" name="x_input_var_integer" dtype_id="1" dir="input" pinIndex="1" vartype="integer" origName="x_input_var_integer"/>
+      <var fl="d50" loc="d,50,57,50,75" name="y_input_wire_logic" dtype_id="2" dir="input" pinIndex="2" vartype="logic" origName="y_input_wire_logic"/>
     </module>
     <module fl="d52" loc="d,52,8,52,12" name="mh18" origName="mh18">
-      <var fl="d52" loc="d,52,24,52,42" name="x_output_var_logic" dtype_id="2" dir="output" vartype="logic" origName="x_output_var_logic"/>
-      <var fl="d52" loc="d,52,50,52,68" name="y_input_wire_logic" dtype_id="2" dir="input" vartype="logic" origName="y_input_wire_logic"/>
+      <var fl="d52" loc="d,52,24,52,42" name="x_output_var_logic" dtype_id="2" dir="output" pinIndex="1" vartype="logic" origName="x_output_var_logic"/>
+      <var fl="d52" loc="d,52,50,52,68" name="y_input_wire_logic" dtype_id="2" dir="input" pinIndex="2" vartype="logic" origName="y_input_wire_logic"/>
     </module>
     <module fl="d54" loc="d,54,8,54,12" name="mh19" origName="mh19">
-      <var fl="d54" loc="d,54,33,54,62" name="x_output_wire_logic_signed_p6" dtype_id="3" dir="output" vartype="logic" origName="x_output_wire_logic_signed_p6"/>
-      <var fl="d54" loc="d,54,72,54,92" name="y_output_var_integer" dtype_id="1" dir="output" vartype="integer" origName="y_output_var_integer"/>
+      <var fl="d54" loc="d,54,33,54,62" name="x_output_wire_logic_signed_p6" dtype_id="3" dir="output" pinIndex="1" vartype="logic" origName="x_output_wire_logic_signed_p6"/>
+      <var fl="d54" loc="d,54,72,54,92" name="y_output_var_integer" dtype_id="1" dir="output" pinIndex="2" vartype="integer" origName="y_output_var_integer"/>
     </module>
     <module fl="d56" loc="d,56,8,56,12" name="mh20" origName="mh20">
-      <var fl="d56" loc="d,56,23,56,41" name="x_ref_var_logic_p6" dtype_id="4" dir="ref" vartype="logic" origName="x_ref_var_logic_p6"/>
-      <var fl="d56" loc="d,56,43,56,61" name="y_ref_var_logic_p6" dtype_id="4" dir="ref" vartype="logic" origName="y_ref_var_logic_p6"/>
+      <var fl="d56" loc="d,56,23,56,41" name="x_ref_var_logic_p6" dtype_id="4" dir="ref" pinIndex="1" vartype="logic" origName="x_ref_var_logic_p6"/>
+      <var fl="d56" loc="d,56,43,56,61" name="y_ref_var_logic_p6" dtype_id="4" dir="ref" pinIndex="2" vartype="logic" origName="y_ref_var_logic_p6"/>
     </module>
     <module fl="d58" loc="d,58,8,58,12" name="mh21" origName="mh21">
-      <var fl="d58" loc="d,58,17,58,33" name="ref_var_logic_u6" dtype_id="6" dir="ref" vartype="port" origName="ref_var_logic_u6"/>
-      <var fl="d58" loc="d,58,41,58,56" name="y_ref_var_logic" dtype_id="2" dir="ref" vartype="logic" origName="y_ref_var_logic"/>
+      <var fl="d58" loc="d,58,17,58,33" name="ref_var_logic_u6" dtype_id="6" dir="ref" pinIndex="1" vartype="port" origName="ref_var_logic_u6"/>
+      <var fl="d58" loc="d,58,41,58,56" name="y_ref_var_logic" dtype_id="2" dir="ref" pinIndex="2" vartype="logic" origName="y_ref_var_logic"/>
     </module>
     <typetable fl="a0" loc="a,0,0,0,0">
       <unpackarraydtype fl="d58" loc="d,58,34,58,35" id="6" sub_dtype_id="2">
diff --git a/test_regress/t/t_xml_first.out b/test_regress/t/t_xml_first.out
index 4c75a4867..b00ac18b9 100644
--- a/test_regress/t/t_xml_first.out
+++ b/test_regress/t/t_xml_first.out
@@ -18,9 +18,9 @@
   </cells>
   <netlist>
     <module fl="d7" loc="d,7,8,7,9" name="t" origName="t" topModule="1">
-      <var fl="d13" loc="d,13,10,13,13" name="clk" dtype_id="1" dir="input" vartype="logic" origName="clk"/>
-      <var fl="d14" loc="d,14,16,14,17" name="d" dtype_id="2" dir="input" vartype="logic" origName="d"/>
-      <var fl="d15" loc="d,15,22,15,23" name="q" dtype_id="2" dir="output" vartype="logic" origName="q"/>
+      <var fl="d13" loc="d,13,10,13,13" name="clk" dtype_id="1" dir="input" pinIndex="2" vartype="logic" origName="clk"/>
+      <var fl="d14" loc="d,14,16,14,17" name="d" dtype_id="2" dir="input" pinIndex="3" vartype="logic" origName="d"/>
+      <var fl="d15" loc="d,15,22,15,23" name="q" dtype_id="2" dir="output" pinIndex="1" vartype="logic" origName="q"/>
       <var fl="d17" loc="d,17,22,17,29" name="between" dtype_id="2" vartype="logic" origName="between"/>
       <instance fl="d20" loc="d,20,4,20,9" name="cell1" defName="mod1__W4" origName="cell1">
         <port fl="d20" loc="d,20,12,20,13" name="q" direction="out" portIndex="1">
@@ -49,9 +49,9 @@
       <var fl="d32" loc="d,32,15,32,20" name="WIDTH" dtype_id="3" vartype="logic" origName="WIDTH" param="true">
         <const fl="d19" loc="d,19,18,19,19" name="32&apos;sh4" dtype_id="3"/>
       </var>
-      <var fl="d34" loc="d,34,24,34,27" name="clk" dtype_id="1" dir="input" vartype="logic" origName="clk"/>
-      <var fl="d35" loc="d,35,30,35,31" name="d" dtype_id="2" dir="input" vartype="logic" origName="d"/>
-      <var fl="d36" loc="d,36,30,36,31" name="q" dtype_id="2" dir="output" vartype="logic" origName="q"/>
+      <var fl="d34" loc="d,34,24,34,27" name="clk" dtype_id="1" dir="input" pinIndex="1" vartype="logic" origName="clk"/>
+      <var fl="d35" loc="d,35,30,35,31" name="d" dtype_id="2" dir="input" pinIndex="2" vartype="logic" origName="d"/>
+      <var fl="d36" loc="d,36,30,36,31" name="q" dtype_id="2" dir="output" pinIndex="3" vartype="logic" origName="q"/>
       <var fl="d39" loc="d,39,15,39,22" name="IGNORED" dtype_id="3" vartype="logic" origName="IGNORED" localparam="true">
         <const fl="d39" loc="d,39,25,39,26" name="32&apos;sh1" dtype_id="3"/>
       </var>
@@ -68,9 +68,9 @@
       </always>
     </module>
     <module fl="d46" loc="d,46,8,46,12" name="mod2" origName="mod2">
-      <var fl="d48" loc="d,48,10,48,13" name="clk" dtype_id="1" dir="input" vartype="logic" origName="clk"/>
-      <var fl="d49" loc="d,49,16,49,17" name="d" dtype_id="2" dir="input" vartype="logic" origName="d"/>
-      <var fl="d50" loc="d,50,22,50,23" name="q" dtype_id="2" dir="output" vartype="logic" origName="q"/>
+      <var fl="d48" loc="d,48,10,48,13" name="clk" dtype_id="1" dir="input" pinIndex="1" vartype="logic" origName="clk"/>
+      <var fl="d49" loc="d,49,16,49,17" name="d" dtype_id="2" dir="input" pinIndex="2" vartype="logic" origName="d"/>
+      <var fl="d50" loc="d,50,22,50,23" name="q" dtype_id="2" dir="output" pinIndex="3" vartype="logic" origName="q"/>
       <contassign fl="d53" loc="d,53,13,53,14" dtype_id="2">
         <varref fl="d53" loc="d,53,15,53,16" name="d" dtype_id="2"/>
         <varref fl="d53" loc="d,53,11,53,12" name="q" dtype_id="2"/>
diff --git a/test_regress/t/t_xml_flat.out b/test_regress/t/t_xml_flat.out
index 4ba3a085a..853f82d5e 100644
--- a/test_regress/t/t_xml_flat.out
+++ b/test_regress/t/t_xml_flat.out
@@ -15,9 +15,9 @@
   </cells>
   <netlist>
     <module fl="d7" loc="d,7,8,7,9" name="TOP" origName="TOP" topModule="1" public="true">
-      <var fl="d13" loc="d,13,10,13,13" name="clk" dtype_id="1" dir="input" vartype="logic" origName="clk" clocker="true" public="true"/>
-      <var fl="d14" loc="d,14,16,14,17" name="d" dtype_id="2" dir="input" vartype="logic" origName="d" public="true"/>
-      <var fl="d15" loc="d,15,22,15,23" name="q" dtype_id="2" dir="output" vartype="logic" origName="q" public="true"/>
+      <var fl="d13" loc="d,13,10,13,13" name="clk" dtype_id="1" dir="input" pinIndex="2" vartype="logic" origName="clk" clocker="true" public="true"/>
+      <var fl="d14" loc="d,14,16,14,17" name="d" dtype_id="2" dir="input" pinIndex="3" vartype="logic" origName="d" public="true"/>
+      <var fl="d15" loc="d,15,22,15,23" name="q" dtype_id="2" dir="output" pinIndex="1" vartype="logic" origName="q" public="true"/>
       <var fl="d13" loc="d,13,10,13,13" name="t.clk" dtype_id="1" vartype="logic" origName="clk"/>
       <var fl="d14" loc="d,14,16,14,17" name="t.d" dtype_id="2" vartype="logic" origName="d"/>
       <var fl="d15" loc="d,15,22,15,23" name="t.q" dtype_id="2" vartype="logic" origName="q"/>
diff --git a/test_regress/t/t_xml_flat_no_inline_mod.out b/test_regress/t/t_xml_flat_no_inline_mod.out
index 803aa990b..0ab79da52 100644
--- a/test_regress/t/t_xml_flat_no_inline_mod.out
+++ b/test_regress/t/t_xml_flat_no_inline_mod.out
@@ -15,7 +15,7 @@
   </cells>
   <netlist>
     <module fl="d11" loc="d,11,8,11,11" name="TOP" origName="TOP" topModule="1" public="true">
-      <var fl="d11" loc="d,11,24,11,29" name="i_clk" dtype_id="1" dir="input" vartype="logic" origName="i_clk" public="true"/>
+      <var fl="d11" loc="d,11,24,11,29" name="i_clk" dtype_id="1" dir="input" pinIndex="1" vartype="logic" origName="i_clk" public="true"/>
       <var fl="d11" loc="d,11,24,11,29" name="top.i_clk" dtype_id="1" vartype="logic" origName="i_clk"/>
       <var fl="d7" loc="d,7,24,7,29" name="top.f.i_clk" dtype_id="1" vartype="logic" origName="i_clk"/>
       <topscope fl="d11" loc="d,11,8,11,11">
diff --git a/test_regress/t/t_xml_flat_pub_mod.out b/test_regress/t/t_xml_flat_pub_mod.out
index 5515cd69c..557437eb3 100644
--- a/test_regress/t/t_xml_flat_pub_mod.out
+++ b/test_regress/t/t_xml_flat_pub_mod.out
@@ -15,7 +15,7 @@
   </cells>
   <netlist>
     <module fl="d11" loc="d,11,8,11,11" name="TOP" origName="TOP" topModule="1" public="true">
-      <var fl="d11" loc="d,11,24,11,29" name="i_clk" dtype_id="1" dir="input" vartype="logic" origName="i_clk" public="true"/>
+      <var fl="d11" loc="d,11,24,11,29" name="i_clk" dtype_id="1" dir="input" pinIndex="1" vartype="logic" origName="i_clk" public="true"/>
       <var fl="d11" loc="d,11,24,11,29" name="top.i_clk" dtype_id="1" vartype="logic" origName="i_clk"/>
       <var fl="d7" loc="d,7,24,7,29" name="top.f.i_clk" dtype_id="1" vartype="logic" origName="i_clk"/>
       <topscope fl="d11" loc="d,11,8,11,11">
diff --git a/test_regress/t/t_xml_flat_vlvbound.out b/test_regress/t/t_xml_flat_vlvbound.out
index ae5da8f13..86271d4b1 100644
--- a/test_regress/t/t_xml_flat_vlvbound.out
+++ b/test_regress/t/t_xml_flat_vlvbound.out
@@ -15,10 +15,10 @@
   </cells>
   <netlist>
     <module fl="d7" loc="d,7,8,7,21" name="TOP" origName="TOP" topModule="1" public="true">
-      <var fl="d9" loc="d,9,25,9,28" name="i_a" dtype_id="1" dir="input" vartype="logic" origName="i_a" public="true"/>
-      <var fl="d10" loc="d,10,25,10,28" name="i_b" dtype_id="1" dir="input" vartype="logic" origName="i_b" public="true"/>
-      <var fl="d11" loc="d,11,25,11,28" name="o_a" dtype_id="2" dir="output" vartype="logic" origName="o_a" public="true"/>
-      <var fl="d12" loc="d,12,25,12,28" name="o_b" dtype_id="2" dir="output" vartype="logic" origName="o_b" public="true"/>
+      <var fl="d9" loc="d,9,25,9,28" name="i_a" dtype_id="1" dir="input" pinIndex="1" vartype="logic" origName="i_a" public="true"/>
+      <var fl="d10" loc="d,10,25,10,28" name="i_b" dtype_id="1" dir="input" pinIndex="2" vartype="logic" origName="i_b" public="true"/>
+      <var fl="d11" loc="d,11,25,11,28" name="o_a" dtype_id="2" dir="output" pinIndex="3" vartype="logic" origName="o_a" public="true"/>
+      <var fl="d12" loc="d,12,25,12,28" name="o_b" dtype_id="2" dir="output" pinIndex="4" vartype="logic" origName="o_b" public="true"/>
       <var fl="d9" loc="d,9,25,9,28" name="vlvbound_test.i_a" dtype_id="1" vartype="logic" origName="i_a"/>
       <var fl="d10" loc="d,10,25,10,28" name="vlvbound_test.i_b" dtype_id="1" vartype="logic" origName="i_b"/>
       <var fl="d11" loc="d,11,25,11,28" name="vlvbound_test.o_a" dtype_id="2" vartype="logic" origName="o_a"/>
diff --git a/test_regress/t/t_xml_output.out b/test_regress/t/t_xml_output.out
index 3426e21ae..645a7b61b 100644
--- a/test_regress/t/t_xml_output.out
+++ b/test_regress/t/t_xml_output.out
@@ -15,7 +15,7 @@
   </cells>
   <netlist>
     <module fl="d7" loc="d,7,8,7,9" name="m" origName="m">
-      <var fl="d8" loc="d,8,10,8,13" name="clk" tag="foo_op" dtype_id="1" dir="input" vartype="logic" origName="clk"/>
+      <var fl="d8" loc="d,8,10,8,13" name="clk" tag="foo_op" dtype_id="1" dir="input" pinIndex="1" vartype="logic" origName="clk"/>
     </module>
     <typetable fl="a0" loc="a,0,0,0,0">
       <basicdtype fl="d8" loc="d,8,10,8,13" id="1" name="logic"/>
diff --git a/test_regress/t/t_xml_tag.out b/test_regress/t/t_xml_tag.out
index 191ce8023..873eaa1a0 100644
--- a/test_regress/t/t_xml_tag.out
+++ b/test_regress/t/t_xml_tag.out
@@ -17,9 +17,9 @@
   </cells>
   <netlist>
     <module fl="d12" loc="d,12,8,12,9" name="m" origName="m" topModule="1">
-      <var fl="d14" loc="d,14,11,14,17" name="clk_ip" tag="clk_ip" dtype_id="1" dir="input" vartype="logic" origName="clk_ip"/>
-      <var fl="d15" loc="d,15,11,15,17" name="rst_ip" dtype_id="1" dir="input" vartype="logic" origName="rst_ip"/>
-      <var fl="d16" loc="d,16,11,16,17" name="foo_op" tag="foo_op" dtype_id="1" dir="output" vartype="logic" origName="foo_op"/>
+      <var fl="d14" loc="d,14,11,14,17" name="clk_ip" tag="clk_ip" dtype_id="1" dir="input" pinIndex="1" vartype="logic" origName="clk_ip"/>
+      <var fl="d15" loc="d,15,11,15,17" name="rst_ip" dtype_id="1" dir="input" pinIndex="2" vartype="logic" origName="rst_ip"/>
+      <var fl="d16" loc="d,16,11,16,17" name="foo_op" tag="foo_op" dtype_id="1" dir="output" pinIndex="3" vartype="logic" origName="foo_op"/>
       <typedef fl="d25" loc="d,25,6,25,15" name="my_struct" tag="my_struct" dtype_id="2"/>
       <instance fl="d29" loc="d,29,8,29,12" name="itop" defName="ifc" origName="itop"/>
       <var fl="d29" loc="d,29,8,29,12" name="itop__Viftop" dtype_id="3" vartype="ifaceref" origName="itop__Viftop"/>

From 2ee52222e2ef87b6ed4c6f96309d57d423591d50 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Sat, 19 Jun 2021 14:39:34 -0400
Subject: [PATCH 40/73] Tests: Add test (#2912).

---
 test_regress/t/t_math_arith.v | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/test_regress/t/t_math_arith.v b/test_regress/t/t_math_arith.v
index 6679ca665..f2c1d366e 100644
--- a/test_regress/t/t_math_arith.v
+++ b/test_regress/t/t_math_arith.v
@@ -174,6 +174,11 @@ module t (/*AUTOARG*/
          if ((1 <-> 0) != 1'b0) $stop;
          if ((1 <-> 1) != 1'b1) $stop;
 
+         // bug2912
+         // verilator lint_off WIDTH
+         if (2'(~1'b1) != 2'b10) $stop;
+         // verilator lint_on WIDTH
+
          $write("*-* All Finished *-*\n");
          $finish;
       end

From fcb8bc22bdeeb0ba4a285cddeb16c61f4ce33339 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sat, 19 Jun 2021 15:50:29 +0100
Subject: [PATCH 41/73] Internals: Remove m_classPrefix from
 AstNodeVarRef/AstNodeCCall

This is now redundant and can be reconstituted in V3EmitC without being
explicitly stored.
---
 src/V3Ast.h        |  8 --------
 src/V3AstNodes.cpp |  7 -------
 src/V3Combine.cpp  |  1 -
 src/V3Descope.cpp  | 17 +----------------
 src/V3EmitC.cpp    | 14 +++++++-------
 5 files changed, 8 insertions(+), 39 deletions(-)

diff --git a/src/V3Ast.h b/src/V3Ast.h
index defd1d5a6..3c92a9a3a 100644
--- a/src/V3Ast.h
+++ b/src/V3Ast.h
@@ -2285,7 +2285,6 @@ private:
     AstNodeModule* m_classOrPackagep = nullptr;  // Package hierarchy
     string m_name;  // Name of variable
     string m_selfPointer;  // Output code object pointer (e.g.: 'this')
-    string m_classPrefix;  // Output class prefix (i.e.: the part before ::)
 
 protected:
     AstNodeVarRef(AstType t, FileLine* fl, const string& name, const VAccess& access)
@@ -2320,9 +2319,6 @@ public:
     string selfPointer() const { return m_selfPointer; }
     void selfPointer(const string& value) { m_selfPointer = value; }
     string selfPointerProtect(bool useSelfForThis) const;
-    string classPrefix() const { return m_classPrefix; }
-    void classPrefix(const string& value) { m_classPrefix = value; }
-    string classPrefixProtect() const;
     AstNodeModule* classOrPackagep() const { return m_classOrPackagep; }
     void classOrPackagep(AstNodeModule* nodep) { m_classOrPackagep = nodep; }
     // Know no children, and hot function, so skip iterator for speed
@@ -2626,7 +2622,6 @@ class AstNodeCCall VL_NOT_FINAL : public AstNodeStmt {
     // Functions are not statements, while tasks are. AstNodeStmt needs isStatement() to deal.
     AstCFunc* m_funcp;
     string m_selfPointer;  // Output code object pointer (e.g.: 'this')
-    string m_classPrefix;  // Output class prefix (i.e.: the part before ::)
     string m_argTypes;
 
 protected:
@@ -2655,9 +2650,6 @@ public:
     string selfPointer() const { return m_selfPointer; }
     void selfPointer(const string& value) { m_selfPointer = value; }
     string selfPointerProtect(bool useSelfForThis) const;
-    string classPrefix() const { return m_classPrefix; }
-    void classPrefix(const string& value) { m_classPrefix = value; }
-    string classPrefixProtect() const;
     void argTypes(const string& str) { m_argTypes = str; }
     string argTypes() const { return m_argTypes; }
     // op1p reserved for AstCMethodCall
diff --git a/src/V3AstNodes.cpp b/src/V3AstNodes.cpp
index d631e4065..e933d6d92 100644
--- a/src/V3AstNodes.cpp
+++ b/src/V3AstNodes.cpp
@@ -63,10 +63,6 @@ string AstNodeVarRef::selfPointerProtect(bool useSelfForThis) const {
     return VIdProtect::protectWordsIf(sp, protect());
 }
 
-string AstNodeVarRef::classPrefixProtect() const {
-    return v3Global.opt.modPrefix() + "_" + VIdProtect::protectWordsIf(classPrefix(), protect());
-}
-
 void AstAddrOfCFunc::cloneRelink() {
     if (m_funcp && m_funcp->clonep()) m_funcp = m_funcp->clonep();
 }
@@ -130,9 +126,6 @@ string AstNodeCCall::selfPointerProtect(bool useSelfForThis) const {
         = useSelfForThis ? VString::replaceWord(selfPointer(), "this", "vlSelf") : selfPointer();
     return VIdProtect::protectWordsIf(sp, protect());
 }
-string AstNodeCCall::classPrefixProtect() const {
-    return v3Global.opt.modPrefix() + "_" + VIdProtect::protectWordsIf(classPrefix(), protect());
-}
 
 void AstNodeCond::numberOperate(V3Number& out, const V3Number& lhs, const V3Number& rhs,
                                 const V3Number& ths) {
diff --git a/src/V3Combine.cpp b/src/V3Combine.cpp
index ee1284598..b5cd7ff20 100644
--- a/src/V3Combine.cpp
+++ b/src/V3Combine.cpp
@@ -73,7 +73,6 @@ public:
                     = oldp->argsp() ? oldp->argsp()->unlinkFrBackWithNext() : nullptr;
                 AstCCall* const newp = new AstCCall(oldp->fileline(), newfuncp, argsp);
                 newp->selfPointer(oldp->selfPointer());
-                newp->classPrefix(oldp->classPrefix());
                 newp->argTypes(oldp->argTypes());
                 addCall(newp);  // Fix the table, in case the newfuncp itself gets replaced
                 oldp->replaceWith(newp);
diff --git a/src/V3Descope.cpp b/src/V3Descope.cpp
index 2428d61a4..a1f5453bd 100644
--- a/src/V3Descope.cpp
+++ b/src/V3Descope.cpp
@@ -106,17 +106,6 @@ private:
         }
     }
 
-    // Construct the class prefix (as in, the part before the :: scope resolution operator) when
-    // referencing an object in 'scopep' from a CFunc in 'm_scopep'.
-    string descopedClassPrefix(const AstScope* scopep) {
-        UASSERT(scopep, "Var/Func not scoped");
-        if (VN_IS(scopep->modp(), Class) && scopep != m_scopep) {
-            return scopep->modp()->name();
-        } else {
-            return "";
-        }
-    }
-
     void makePublicFuncWrappers() {
         // We recorded all public functions in m_modFuncs.
         // If for any given name only one function exists, we can use that function directly.
@@ -229,10 +218,7 @@ private:
         UASSERT_OBJ(m_scopep, nodep, "Node not under scope");
         const AstVar* const varp = nodep->varScopep()->varp();
         const AstScope* const scopep = nodep->varScopep()->scopep();
-        if (!varp->isFuncLocal()) {
-            nodep->selfPointer(descopedSelfPointer(scopep));
-            nodep->classPrefix(descopedClassPrefix(scopep));
-        }
+        if (!varp->isFuncLocal()) { nodep->selfPointer(descopedSelfPointer(scopep)); }
         nodep->varScopep(nullptr);
         UINFO(9, "  refout " << nodep << endl);
     }
@@ -243,7 +229,6 @@ private:
         UASSERT_OBJ(m_scopep, nodep, "Node not under scope");
         const AstScope* const scopep = nodep->funcp()->scopep();
         nodep->selfPointer(descopedSelfPointer(scopep));
-        nodep->classPrefix(descopedClassPrefix(scopep));
         // Can't do this, as we may have more calls later
         // nodep->funcp()->scopep(nullptr);
     }
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 9aa369517..dd48ecfe4 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -386,12 +386,11 @@ public:
             puts(funcp->name());
         } else if (funcp->isProperMethod() && funcp->isStatic()) {
             // Call static method via the containing class
-            AstNodeModule* modp = VN_CAST(funcp->user4p(), NodeModule);
-            puts(prefixNameProtect(modp) + "::");
+            puts(prefixNameProtect(funcp->user4p()) + "::");
             puts(funcp->nameProtect());
-        } else if (!nodep->classPrefix().empty()) {
-            // Prefix explicitly given
-            puts(nodep->classPrefixProtect() + "::");
+        } else if (VN_IS(funcp->user4p(), Class) && funcp->user4p() != m_modp) {
+            // Calling superclass method
+            puts(prefixNameProtect(funcp->user4p()) + "::");
             puts(funcp->nameProtect());
         } else if (funcp->isLoose()) {
             // Calling loose method
@@ -1133,8 +1132,9 @@ public:
         } else if (varp->isStatic()) {
             // Access static variable via the containing class
             puts(prefixNameProtect(varp->user4p()) + "::");
-        } else if (!nodep->classPrefix().empty()) {
-            puts(nodep->classPrefixProtect() + "::");
+        } else if (VN_IS(varp->user4p(), Class) && varp->user4p() != m_modp) {
+            // Superclass member reference
+            puts(prefixNameProtect(varp->user4p()) + "::");
         } else if (!nodep->selfPointer().empty()) {
             emitDereference(nodep->selfPointerProtect(m_useSelfForThis));
         }

From 19398efc4cc17d43dbc642f1d6f7bbef9659a0ed Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sat, 19 Jun 2021 16:48:20 +0100
Subject: [PATCH 42/73] Remove no-op VL_CELL. No functional change intended.

---
 include/verilated.h |  2 --
 src/V3EmitC.cpp     | 26 +++++++++-----------------
 2 files changed, 9 insertions(+), 19 deletions(-)

diff --git a/include/verilated.h b/include/verilated.h
index 107f217de..cb375d27c 100644
--- a/include/verilated.h
+++ b/include/verilated.h
@@ -283,8 +283,6 @@ public:
 #define VL_OUT(name, msb, lsb) IData name  ///< Declare output signal, 17-32 bits
 #define VL_OUTW(name, msb, lsb, words) WData name[words]  ///< Declare output signal, 65+ bits
 
-#define VL_CELL(instname, type)  ///< Declare a cell, ala SP_CELL
-
 ///< Declare a module, ala SC_MODULE
 #define VL_MODULE(modname) class modname VL_NOT_FINAL : public VerilatedModule
 // Not class final in VL_MODULE, as users might be abstracting our models (--hierarchical)
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index dd48ecfe4..77142c101 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -1873,7 +1873,6 @@ class EmitCImp final : EmitCStmts {
         return "";
     }
 
-    void emitCellCtors(AstNodeModule* modp);
     void emitSensitives();
     // Medium level
     void emitCtorImp(AstNodeModule* modp);
@@ -2480,7 +2479,15 @@ void EmitCImp::emitCtorImp(AstNodeModule* modp) {
     if (modp->isTop() && v3Global.opt.mtasks()) emitThreadingCtors(&first);
 
     puts(" {\n");
-    emitCellCtors(modp);
+
+    if (modp->isTop()) {
+        putsDecoration("// Create Sym instance\n");
+        // Must be before other constructors, as __vlCoverInsert calls it.
+        // Note _vcontextp__ may be nullptr, VerilatedSyms::VerilatedSyms cleans it up
+        puts(EmitCBaseVisitor::symClassVar() + " = new " + symClassName() + "("
+             + (optSystemC() ? "nullptr" : "_vcontextp__") + ", this, name());\n");
+    }
+
     emitSensitives();
 
     putsDecoration("// Reset internal values\n");
@@ -2717,21 +2724,6 @@ void EmitCImp::emitTextSection(AstType type) {
     if (last_line > 0) puts("//*** Above code from `systemc in Verilog file\n\n");
 }
 
-void EmitCImp::emitCellCtors(AstNodeModule* modp) {
-    if (modp->isTop()) {
-        // Must be before other constructors, as __vlCoverInsert calls it
-        // Note _vcontextp__ may be nullptr, VerilatedSyms::VerilatedSyms cleans it up
-        puts(EmitCBaseVisitor::symClassVar() + " = new " + symClassName() + "("
-             + (optSystemC() ? "nullptr" : "_vcontextp__") + ", this, name());\n");
-    }
-    for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
-        if (AstCell* cellp = VN_CAST(nodep, Cell)) {
-            puts("VL_CELL(" + cellp->nameProtect() + ", " + prefixNameProtect(cellp->modp())
-                 + ");\n");
-        }
-    }
-}
-
 void EmitCImp::emitSensitives() {
     // Create sensitivity list for when to evaluate the model.
     // If C++ code, the user must call this routine themself.

From f064a94f1d34d05347977a5894c1fd2288851efe Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Sat, 19 Jun 2021 17:12:56 +0100
Subject: [PATCH 43/73] Configure time unit/time precision in the Sym
 constructor.

This used to be done in the constructor of the top module, but there is
no reason to do it there. Internals are cleaner with this in the Sym
constructor. No functional change intended.
---
 src/V3EmitC.cpp     |  8 --------
 src/V3EmitCSyms.cpp | 12 ++++++++++++
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 77142c101..b8f870f21 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -2549,14 +2549,6 @@ void EmitCImp::emitConfigureImp(AstNodeModule* modp) {
     if (v3Global.opt.coverage()) {
         puts(modName + "__" + protect("_configure_coverage") + "(this, first);\n");
     }
-    if (modp->isTop() && !v3Global.rootp()->timeunit().isNone()) {
-        puts("vlSymsp->_vm_contextp__->timeunit("
-             + cvtToStr(v3Global.rootp()->timeunit().powerOfTen()) + ");\n");
-    }
-    if (modp->isTop() && !v3Global.rootp()->timeprecision().isNone()) {
-        puts("vlSymsp->_vm_contextp__->timeprecision("
-             + cvtToStr(v3Global.rootp()->timeprecision().powerOfTen()) + ");\n");
-    }
     puts("}\n");
     splitSizeInc(10);
 }
diff --git a/src/V3EmitCSyms.cpp b/src/V3EmitCSyms.cpp
index f5d41845b..ccd80af56 100644
--- a/src/V3EmitCSyms.cpp
+++ b/src/V3EmitCSyms.cpp
@@ -704,6 +704,18 @@ void EmitCSyms::emitSymImp() {
         }
     }
 
+    puts("// Configure time unit / time precision\n");
+    if (!v3Global.rootp()->timeunit().isNone()) {
+        puts("_vm_contextp__->timeunit(");
+        puts(cvtToStr(v3Global.rootp()->timeunit().powerOfTen()));
+        puts(");\n");
+    }
+    if (!v3Global.rootp()->timeprecision().isNone()) {
+        puts("_vm_contextp__->timeprecision(");
+        puts(cvtToStr(v3Global.rootp()->timeprecision().powerOfTen()));
+        puts(");\n");
+    }
+
     puts("// Setup each module's pointer back to symbol table (for public functions)\n");
     puts("TOPp->" + protect("__Vconfigure") + "(this, true);\n");
     for (const auto& i : m_scopes) {

From ec4eb18846cf6fbe7edf7ee886ee3355df33ebfb Mon Sep 17 00:00:00 2001
From: Yutetsu TAKATSUKASA <y.takatsukasa@gmail.com>
Date: Mon, 21 Jun 2021 07:28:39 +0900
Subject: [PATCH 44/73] Fiix incorrect result by bit tree opt (#3023) (#3030)

* Add a test to reproduce #3023. Also applied verilog-mode formatting.

* use unique_ptr. No functional change is intended.

* Introduce restorer that reverts changes during iterate() if failed.
---
 src/V3Const.cpp                   | 107 ++++++++++++++++++++++--------
 test_regress/t/t_const_opt_red.pl |   2 +-
 test_regress/t/t_const_opt_red.v  |  85 +++++++++++++++++++++---
 3 files changed, 157 insertions(+), 37 deletions(-)

diff --git a/src/V3Const.cpp b/src/V3Const.cpp
index af4b14b3a..41bcda7cc 100644
--- a/src/V3Const.cpp
+++ b/src/V3Const.cpp
@@ -82,13 +82,58 @@ public:
 class ConstBitOpTreeVisitor final : public AstNVisitor {
     // TYPES
 
-    struct LeafInfo {  // Leaf node (either AstConst or AstVarRef)
+    struct LeafInfo final {  // Leaf node (either AstConst or AstVarRef)
         bool m_polarity = true;
         int m_lsb = 0;
         int m_wordIdx = -1;  // -1 means AstWordSel is not used.
         AstVarRef* m_refp = nullptr;
         AstConst* m_constp = nullptr;
     };
+
+    struct BitPolarityEntry final {  // Found bit polarity during iterate()
+        LeafInfo m_info;
+        bool m_polarity;
+        int m_bit;
+        BitPolarityEntry(const LeafInfo& info, bool pol, int bit)
+            : m_info(info)
+            , m_polarity(pol)
+            , m_bit(bit) {}
+        BitPolarityEntry() = default;
+    };
+
+    class Restorer final {  // Restore the original state unless disableRestore() is called
+        ConstBitOpTreeVisitor& m_visitor;
+        const size_t m_polaritiesSize;
+        const size_t m_frozenSize;
+        const int m_ops;
+        const bool m_polarity;
+        bool m_restore;
+
+    public:
+        explicit Restorer(ConstBitOpTreeVisitor& visitor)
+            : m_visitor(visitor)
+            , m_polaritiesSize(visitor.m_bitPolarities.size())
+            , m_frozenSize(visitor.m_frozenNodes.size())
+            , m_ops(visitor.m_ops)
+            , m_polarity(visitor.m_polarity)
+            , m_restore(true) {}
+        ~Restorer() {
+            UASSERT(m_visitor.m_bitPolarities.size() >= m_polaritiesSize,
+                    "m_bitPolarities must grow monotorilaclly");
+            UASSERT(m_visitor.m_frozenNodes.size() >= m_frozenSize,
+                    "m_frozenNodes must grow monotorilaclly");
+            if (m_restore) restoreNow();
+        }
+        void disableRestore() { m_restore = false; }
+        void restoreNow() {
+            UASSERT(m_restore, "Can be called just once");
+            m_visitor.m_bitPolarities.resize(m_polaritiesSize);
+            m_visitor.m_frozenNodes.resize(m_frozenSize);
+            m_visitor.m_ops = m_ops;
+            m_visitor.m_polarity = m_polarity;
+            m_restore = false;
+        }
+    };
     // Collect information for each Variable to transform as below
     class VarInfo final {
         // MEMBERS
@@ -195,7 +240,8 @@ class ConstBitOpTreeVisitor final : public AstNVisitor {
 
     AstUser4InUse m_inuser4;
     std::vector<AstNode*> m_frozenNodes;  // Nodes that cannot be optimized
-    std::vector<VarInfo*> m_varInfos;  // VarInfo for each variable, [0] is nullptr
+    std::vector<BitPolarityEntry> m_bitPolarities;  // Polarity of bits found during iterate()
+    std::vector<std::unique_ptr<VarInfo>> m_varInfos;  // VarInfo for each variable, [0] is nullptr
 
     // NODE STATE
     // AstVarRef::user4u      -> Base index of m_varInfos that points VarInfo
@@ -235,14 +281,14 @@ class ConstBitOpTreeVisitor final : public AstNVisitor {
             baseIdx = m_varInfos.size();
             const int numWords
                 = ref.m_refp->dtypep()->isWide() ? ref.m_refp->dtypep()->widthWords() : 1;
-            m_varInfos.resize(m_varInfos.size() + numWords, nullptr);
+            m_varInfos.resize(m_varInfos.size() + numWords);
             nodep->user4(baseIdx);
         }
         const size_t idx = baseIdx + std::max(0, ref.m_wordIdx);
-        VarInfo* varInfop = m_varInfos[idx];
+        VarInfo* varInfop = m_varInfos[idx].get();
         if (!varInfop) {
             varInfop = new VarInfo{this, ref.m_refp};
-            m_varInfos[idx] = varInfop;
+            m_varInfos[idx].reset(varInfop);
         } else {
             if (!varInfop->sameVarAs(ref.m_refp))
                 CONST_BITOP_SET_FAILED("different var (scope?)", ref.m_refp);
@@ -325,6 +371,7 @@ class ConstBitOpTreeVisitor final : public AstNVisitor {
     }
 
     virtual void visit(AstRedXor* nodep) override {  // Expect '^(mask & v)'
+        Restorer restorer{*this};
         CONST_BITOP_RETURN_IF(!VN_IS(m_rootp, Xor), nodep);
         AstAnd* andp = VN_CAST(nodep->lhsp(), And);
         CONST_BITOP_RETURN_IF(!andp, nodep->lhsp());
@@ -335,13 +382,14 @@ class ConstBitOpTreeVisitor final : public AstNVisitor {
         LeafInfo leaf = findLeaf(andp->rhsp(), false);
         CONST_BITOP_RETURN_IF(!leaf.m_refp, andp->rhsp());
 
+        restorer.disableRestore();  // Now all subtree succeeded
+
         incrOps(nodep, __LINE__);
         incrOps(andp, __LINE__);
         const V3Number& maskNum = mask.m_constp->num();
-        VarInfo& varInfo = getVarInfo(leaf);
         for (int i = 0; i < maskNum.width(); ++i) {
             // Set true, m_treePolarity takes care of the entire parity
-            if (maskNum.bitIs1(i)) varInfo.setPolarity(true, i + leaf.m_lsb);
+            if (maskNum.bitIs1(i)) m_bitPolarities.emplace_back(leaf, true, i + leaf.m_lsb);
         }
     }
 
@@ -357,29 +405,28 @@ class ConstBitOpTreeVisitor final : public AstNVisitor {
             VL_RESTORER(m_leafp);
 
             for (int i = 0; i < 2; ++i) {
+                Restorer restorer{*this};
                 LeafInfo leafInfo;
                 m_leafp = &leafInfo;
                 m_curOpp = i == 0 ? nodep->lhsp() : nodep->rhsp();
-                const size_t origFrozens = m_frozenNodes.size();
-                const int origOps = m_ops;
                 const bool origFailed = m_failed;
                 iterate(m_curOpp);
                 if (leafInfo.m_constp || m_failed) {
                     // Rvert changes in leaf
-                    if (m_frozenNodes.size() > origFrozens) m_frozenNodes.resize(origFrozens);
+                    restorer.restoreNow();
                     m_frozenNodes.push_back(m_curOpp);
-                    m_ops = origOps;
                     m_failed = origFailed;
-                } else if (leafInfo.m_refp) {
-                    VarInfo& varInfo = getVarInfo(leafInfo);
-                    if (!varInfo.hasConstantResult()) {
-                        varInfo.setPolarity(isXorTree() || leafInfo.m_polarity, leafInfo.m_lsb);
-                    }
+                    continue;
                 }
+                restorer.disableRestore();  // Now all checks passed
+                if (leafInfo.m_refp)
+                    m_bitPolarities.emplace_back(leafInfo, isXorTree() || leafInfo.m_polarity,
+                                                 leafInfo.m_lsb);
             }
             return;
         } else if (VN_IS(m_rootp, Xor) && VN_IS(nodep, Eq) && isConst(nodep->lhsp(), 0)
                    && VN_IS(nodep->rhsp(), And)) {  // 0 == (1 & RedXor)
+            Restorer restorer{*this};
             AstAnd* andp = static_cast<AstAnd*>(nodep->rhsp());  // already checked above
             CONST_BITOP_RETURN_IF(!isConst(andp->lhsp(), 1), andp->lhsp());
             AstRedXor* redXorp = VN_CAST(andp->rhsp(), RedXor);
@@ -388,14 +435,21 @@ class ConstBitOpTreeVisitor final : public AstNVisitor {
             incrOps(andp, __LINE__);
             m_polarity = !m_polarity;
             iterate(redXorp);
+            CONST_BITOP_RETURN_IF(m_failed, redXorp);
+
+            restorer.disableRestore();  // Now all checks passed
             return;
         } else if (VN_IS(m_rootp, Xor) && VN_IS(nodep, And) && isConst(nodep->lhsp(), 1)
                    && (VN_IS(nodep->rhsp(), Xor)
                        || VN_IS(nodep->rhsp(), RedXor))) {  // 1 & (v[3] ^ v[2])
+            Restorer restorer{*this};
             incrOps(nodep, __LINE__);
             iterate(nodep->rhsp());
+            CONST_BITOP_RETURN_IF(m_failed, nodep->rhsp());
+            restorer.disableRestore();  // Now all checks passed
             return;
         } else if ((isAndTree() && VN_IS(nodep, Eq)) || (isOrTree() && VN_IS(nodep, Neq))) {
+            Restorer restorer{*this};
             CONST_BITOP_RETURN_IF(!m_polarity, nodep);
             const bool maskFlip = isOrTree();
             LeafInfo comp = findLeaf(nodep->lhsp(), true);
@@ -410,14 +464,14 @@ class ConstBitOpTreeVisitor final : public AstNVisitor {
             LeafInfo ref = findLeaf(andp->rhsp(), false);
             CONST_BITOP_RETURN_IF(!ref.m_refp, andp->rhsp());
 
-            VarInfo& varInfo = getVarInfo(ref);
+            restorer.disableRestore();  // Now all checks passed
 
             const V3Number maskNum = mask.m_constp->num();
             const V3Number compNum = comp.m_constp->num();
-            for (int i = 0; i < maskNum.width() && !varInfo.hasConstantResult(); ++i) {
+            for (int i = 0; i < maskNum.width(); ++i) {
                 const int bit = i + ref.m_lsb;
                 if (maskNum.bitIs0(i)) continue;
-                varInfo.setPolarity(compNum.bitIs1(i) ^ maskFlip, bit);
+                m_bitPolarities.emplace_back(ref, compNum.bitIs1(i) != maskFlip, bit);
             }
             incrOps(nodep, __LINE__);
             incrOps(andp, __LINE__);
@@ -440,13 +494,14 @@ class ConstBitOpTreeVisitor final : public AstNVisitor {
             incrOps(nodep, __LINE__);
             iterateChildren(nodep);
         }
+        for (auto&& entry : m_bitPolarities) {
+            VarInfo& info = getVarInfo(entry.m_info);
+            if (info.hasConstantResult()) continue;
+            info.setPolarity(entry.m_polarity, entry.m_bit);
+        }
         UASSERT_OBJ(isXorTree() || m_polarity, nodep, "must be the original polarity");
     }
-    virtual ~ConstBitOpTreeVisitor() {
-        for (size_t i = 0; i < m_varInfos.size(); ++i) {
-            VL_DO_DANGLING(delete m_varInfos[i], m_varInfos[i]);
-        }
-    }
+    virtual ~ConstBitOpTreeVisitor() = default;
 #undef CONST_BITOP_RETURN_IF
 #undef CONST_BITOP_SET_FAILED
 
@@ -466,7 +521,7 @@ public:
         // Two ops for each varInfo. (And and Eq)
         const int vars = visitor.m_varInfos.size() - 1;
         int constTerms = 0;
-        for (const VarInfo* v : visitor.m_varInfos) {
+        for (auto&& v : visitor.m_varInfos) {
             if (v && v->hasConstantResult()) ++constTerms;
         }
         // Expected number of ops after this simplification
@@ -486,7 +541,7 @@ public:
         AstNode* resultp = nullptr;
         // VarInfo in visitor.m_varInfos appears in deterministic order,
         // so the optimized AST is deterministic too.
-        for (const VarInfo* varinfop : visitor.m_varInfos) {
+        for (auto&& varinfop : visitor.m_varInfos) {
             if (!varinfop) continue;
             AstNode* partialresultp = varinfop->getResult();
             resultp = visitor.combineTree(resultp, partialresultp);
diff --git a/test_regress/t/t_const_opt_red.pl b/test_regress/t/t_const_opt_red.pl
index 4cc2b40a0..d2a4c777b 100755
--- a/test_regress/t/t_const_opt_red.pl
+++ b/test_regress/t/t_const_opt_red.pl
@@ -19,7 +19,7 @@ execute(
     );
 
 if ($Self->{vlt}) {
-    file_grep($Self->{stats}, qr/Optimizations, Const bit op reduction\s+(\d+)/i, 141);
+    file_grep($Self->{stats}, qr/Optimizations, Const bit op reduction\s+(\d+)/i, 149);
 }
 
 ok(1);
diff --git a/test_regress/t/t_const_opt_red.v b/test_regress/t/t_const_opt_red.v
index 1f5e407d7..b8d2725ac 100644
--- a/test_regress/t/t_const_opt_red.v
+++ b/test_regress/t/t_const_opt_red.v
@@ -20,6 +20,8 @@ module t(/*AUTOARG*/
    /*AUTOWIRE*/
    // Beginning of automatic wires (for undeclared instantiated-module outputs)
    logic                a1;                     // From test of Test.v
+   logic                a10;                    // From test of Test.v
+   logic                a11;                    // From test of Test.v
    logic                a2;                     // From test of Test.v
    logic                a3;                     // From test of Test.v
    logic                a4;                     // From test of Test.v
@@ -28,9 +30,9 @@ module t(/*AUTOARG*/
    logic                a7;                     // From test of Test.v
    logic                a8;                     // From test of Test.v
    logic                a9;                     // From test of Test.v
-   logic                a10;                    // From test of Test.v
-   logic                a11;                    // From test of Test.v
    logic                o1;                     // From test of Test.v
+   logic                o10;                    // From test of Test.v
+   logic                o11;                    // From test of Test.v
    logic                o2;                     // From test of Test.v
    logic                o3;                     // From test of Test.v
    logic                o4;                     // From test of Test.v
@@ -39,8 +41,6 @@ module t(/*AUTOARG*/
    logic                o7;                     // From test of Test.v
    logic                o8;                     // From test of Test.v
    logic                o9;                     // From test of Test.v
-   logic                o10;                    // From test of Test.v
-   logic                o11;                    // From test of Test.v
    logic                x1;                     // From test of Test.v
    logic                x2;                     // From test of Test.v
    logic                x3;                     // From test of Test.v
@@ -59,7 +59,12 @@ module t(/*AUTOARG*/
    logic                z7;                     // From test of Test.v
    // End of automatics
 
-   wire [31:0]          i = crc[31:0];
+   wire [15:0] vec_i = crc[15:0];
+   wire [31:0] i = crc[31:0];
+   logic       b8_i;
+   logic       b12_i;
+   logic       match1_o;
+   logic       match2_o;
 
    Test test(/*AUTOINST*/
              // Outputs
@@ -105,6 +110,15 @@ module t(/*AUTOARG*/
              .clk                       (clk),
              .i                         (i[31:0]));
 
+   match i_match(
+                 .vec_i ( i[15:0] ),
+                 .b8_i ( b8_i ),
+                 .b12_i ( b12_i ),
+                 .match1_o ( match1_o ),
+                 .match2_o ( match2_o )
+                 );
+
+
    // Aggregate outputs into a single result vector
    // verilator lint_off WIDTH
    wire [63:0] result = {a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,
@@ -127,6 +141,8 @@ module t(/*AUTOARG*/
          // Setup
          crc <= 64'h5aef0c8d_d70a4497;
          sum <= '0;
+         b8_i <= 1'b0;
+         b12_i <= 1'b0;
       end
       else if (cyc < 10) begin
          sum <= '0;
@@ -157,6 +173,10 @@ module t(/*AUTOARG*/
          if (z5 != '1) $stop;
          if (z6 != '1) $stop;
          if (z7 != '0) $stop;
+         if (match1_o != match2_o) begin
+            $write("[%0t] cyc==%0d m1=%d != m2=%d\n",$time, cyc, match1_o, match2_o);
+            $stop;
+         end
       end
       else begin
          $write("[%0t] cyc==%0d crc=%x sum=%x\n",$time, cyc, crc, sum);
@@ -173,10 +193,9 @@ endmodule
 
 module Test(/*AUTOARG*/
    // Outputs
-   a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
-   o1, o2, o3, o4, o5, o6, o7, o8, o9, o10, o11,
-   x1, x2, x3, x4, x5, x6, x7, x8, x9,
-   z1, z2, z3, z4, z5, z6, z7,
+   a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, o1, o2, o3, o4, o5,
+   o6, o7, o8, o9, o10, o11, x1, x2, x3, x4, x5, x6, x7, x8, x9, z1,
+   z2, z3, z4, z5, z6, z7,
    // Inputs
    clk, i
    );
@@ -190,7 +209,7 @@ module Test(/*AUTOARG*/
    output logic z1, z2, z3, z4, z5, z6, z7;
 
    logic [127:0] d;
-   logic [17:0] e;
+   logic [17:0]  e;
    always_ff @(posedge clk) d <= {i, ~i, ~i, i};
    always_ff @(posedge clk) e <= i[17:00];
 
@@ -240,3 +259,49 @@ module Test(/*AUTOARG*/
    end
 
 endmodule
+
+
+module match
+  (
+   input logic [15:0] vec_i,
+   input logic        b8_i,
+   input logic        b12_i,
+   output logic       match1_o,
+   output logic       match2_o
+   );
+
+   always_comb
+     begin
+        match1_o = 1'b0;
+        if (
+            (vec_i[1:0] == 2'b0)
+            &&
+            (vec_i[4] == 1'b0)
+            &&
+            (vec_i[8] == b8_i)
+            &&
+            (vec_i[12] == b12_i)
+            )
+          begin
+             match1_o = 1'b1;
+          end
+     end
+
+   always_comb
+     begin
+        match2_o = 1'b0;
+        if (
+            (vec_i[1:0] == 2'b0)
+            &&
+            (vec_i[8] == b8_i)
+            &&
+            (vec_i[12] == b12_i)
+            &&
+            (vec_i[4] == 1'b0)
+            )
+          begin
+             match2_o = 1'b1;
+          end
+     end
+
+endmodule

From 512fe0a2d12a8a755dc1eeab4620d0dc8b13063e Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Sun, 20 Jun 2021 18:32:57 -0400
Subject: [PATCH 45/73] Internals: Add const. No functional change.

---
 src/V3Assert.cpp           |   6 +-
 src/V3Ast.cpp              |   6 +-
 src/V3AstNodes.cpp         |  14 +++--
 src/V3AstNodes.h           |   6 +-
 src/V3AstUserAllocator.h   |  10 +--
 src/V3Begin.cpp            |   2 +-
 src/V3Branch.cpp           |  10 +--
 src/V3Broken.cpp           |   4 +-
 src/V3CCtors.cpp           |   4 +-
 src/V3Cdc.cpp              |  11 ++--
 src/V3Clean.cpp            |   9 +--
 src/V3Clock.cpp            |   2 +-
 src/V3Config.cpp           |   8 +--
 src/V3Const.cpp            |  69 +++++++++++----------
 src/V3Coverage.cpp         |  27 ++++----
 src/V3Delayed.cpp          |  14 ++---
 src/V3Depth.cpp            |   2 +-
 src/V3Descope.cpp          |   5 +-
 src/V3EmitC.cpp            |  85 ++++++++++++-------------
 src/V3EmitCMain.cpp        |   2 +-
 src/V3EmitCMake.cpp        |   4 +-
 src/V3EmitCSyms.cpp        |  60 +++++++++---------
 src/V3EmitMk.cpp           |   4 +-
 src/V3EmitV.cpp            |   3 +-
 src/V3EmitXml.cpp          |  14 ++---
 src/V3Error.cpp            |   8 +--
 src/V3Expand.cpp           |  26 ++++----
 src/V3File.cpp             |  36 +++++------
 src/V3FileLine.cpp         |   8 +--
 src/V3Gate.cpp             |   2 +-
 src/V3Graph.cpp            |   8 +--
 src/V3GraphDfa.cpp         |   2 +-
 src/V3GraphPathChecker.cpp |   2 +-
 src/V3HierBlock.cpp        |   6 +-
 src/V3Inline.cpp           |  20 +++---
 src/V3Inst.cpp             |  29 ++++-----
 src/V3Life.cpp             |   2 +-
 src/V3LifePost.cpp         |   4 +-
 src/V3LinkCells.cpp        |   9 +--
 src/V3LinkDot.cpp          | 101 +++++++++++++++---------------
 src/V3LinkInc.cpp          |   2 +-
 src/V3LinkJump.cpp         |   2 +-
 src/V3LinkParse.cpp        |  18 +++---
 src/V3LinkResolve.cpp      |  10 +--
 src/V3List.h               |   6 +-
 src/V3Name.cpp             |   6 +-
 src/V3Number.cpp           |  52 ++++++++--------
 src/V3Number_test.cpp      |   2 +-
 src/V3OptionParser.cpp     |   4 +-
 src/V3Options.cpp          |  54 ++++++++--------
 src/V3Order.cpp            |  29 ++++-----
 src/V3Os.cpp               |  20 +++---
 src/V3Param.cpp            |  23 +++----
 src/V3ParseImp.cpp         |  22 +++----
 src/V3ParseLex.cpp         |   2 +-
 src/V3Partition.cpp        |  22 +++----
 src/V3PreProc.cpp          |  60 +++++++++---------
 src/V3PreShell.cpp         |   6 +-
 src/V3Premit.cpp           |   2 +-
 src/V3Reloop.cpp           |   2 +-
 src/V3Scope.cpp            |   2 +-
 src/V3Scoreboard.h         |   4 +-
 src/V3Simulate.h           |  22 +++----
 src/V3Slice.cpp            |  22 +++----
 src/V3SplitAs.cpp          |   2 +-
 src/V3SplitVar.cpp         |   2 +-
 src/V3Stats.cpp            |  10 +--
 src/V3StatsReport.cpp      |   9 +--
 src/V3String.cpp           |  38 ++++++------
 src/V3String.h             |   2 +-
 src/V3Subst.cpp            |   4 +-
 src/V3SymTable.h           |   2 +-
 src/V3TSP.cpp              |  12 ++--
 src/V3Task.cpp             |  22 +++----
 src/V3Trace.cpp            |   2 +-
 src/V3TraceDecl.cpp        |   2 +-
 src/V3Tristate.cpp         |  14 ++---
 src/V3Undriven.cpp         |  16 ++---
 src/V3Unknown.cpp          |   8 +--
 src/V3Unroll.cpp           |   4 +-
 src/V3Width.cpp            | 124 +++++++++++++++++++------------------
 src/V3WidthCommit.h        |   2 +-
 src/V3WidthSel.cpp         |  18 +++---
 src/Verilator.cpp          |   2 +-
 src/VlcMain.cpp            |   2 +-
 src/VlcPoint.h             |   2 +-
 src/VlcTop.cpp             |  22 +++----
 87 files changed, 690 insertions(+), 669 deletions(-)

diff --git a/src/V3Assert.cpp b/src/V3Assert.cpp
index 8b53adf95..22ae310ba 100644
--- a/src/V3Assert.cpp
+++ b/src/V3Assert.cpp
@@ -163,7 +163,7 @@ private:
             } else {
                 ++m_statAsNotImm;
             }
-            bool force = VN_IS(nodep, AssertIntrinsic);
+            const bool force = VN_IS(nodep, AssertIntrinsic);
             if (passsp) passsp = newIfAssertOn(passsp, force);
             if (failsp) failsp = newIfAssertOn(failsp, force);
             if (!failsp) failsp = newFireAssertUnchecked(nodep, "'assert' failed.");
@@ -231,7 +231,7 @@ private:
             } while (ifp);
 
             AstNode* newifp = nodep->cloneTree(false);
-            bool allow_none = nodep->unique0Pragma();
+            const bool allow_none = nodep->unique0Pragma();
 
             // Empty case means no property
             if (!propp) propp = new AstConst(nodep->fileline(), AstConst::BitFalse());
@@ -305,7 +305,7 @@ private:
                     // Empty case means no property
                     if (!propp) propp = new AstConst(nodep->fileline(), AstConst::BitFalse());
 
-                    bool allow_none = has_default || nodep->unique0Pragma();
+                    const bool allow_none = has_default || nodep->unique0Pragma();
                     AstNode* ohot
                         = (allow_none
                                ? static_cast<AstNode*>(new AstOneHot0(nodep->fileline(), propp))
diff --git a/src/V3Ast.cpp b/src/V3Ast.cpp
index 4329c7633..31f819c53 100644
--- a/src/V3Ast.cpp
+++ b/src/V3Ast.cpp
@@ -119,7 +119,7 @@ string AstNode::encodeName(const string& namein) {
             // a user identifier nor a temp we create in Verilator.
             // We also do *NOT* use __DOT__ etc, as we search for those
             // in some replacements, and don't want to mangle the user's names.
-            unsigned val = pos[0] & 0xff;  // Mask to avoid sign extension
+            const unsigned val = pos[0] & 0xff;  // Mask to avoid sign extension
             std::stringstream hex;
             hex << std::setfill('0') << std::setw(2) << std::hex << val;
             out += "__0" + hex.str();
@@ -1045,7 +1045,7 @@ void AstNode::dumpTreeFileGdb(const AstNode* nodep,  // LCOV_EXCL_START
         cout << "<nullptr>" << endl;
         return;
     }
-    string filename = filenamep ? filenamep : v3Global.debugFilename("debug.tree", 98);
+    const string filename = filenamep ? filenamep : v3Global.debugFilename("debug.tree", 98);
     v3Global.rootp()->dumpTreeFile(filename);
 }  // LCOV_EXCL_STOP
 
@@ -1178,7 +1178,7 @@ string AstNode::locationStr() const {
             str += modp->hierName();
             return str;
         } else if ((nvrp = VN_CAST_CONST(backp, NodeVarRef))) {
-            string prettyName = nvrp->prettyName();
+            const string prettyName = nvrp->prettyName();
             // VarRefs have not been flattened yet and do not contain location information
             if (prettyName != nvrp->name()) {
                 str += prettyName;
diff --git a/src/V3AstNodes.cpp b/src/V3AstNodes.cpp
index e933d6d92..9bb1d5067 100644
--- a/src/V3AstNodes.cpp
+++ b/src/V3AstNodes.cpp
@@ -284,7 +284,7 @@ AstNetlist::AstNetlist()
 }
 
 void AstNetlist::timeprecisionMerge(FileLine*, const VTimescale& value) {
-    VTimescale prec = v3Global.opt.timeComputePrec(value);
+    const VTimescale prec = v3Global.opt.timeComputePrec(value);
     if (prec.isNone() || prec == m_timeprecision) {
     } else if (m_timeprecision.isNone()) {
         m_timeprecision = prec;
@@ -343,7 +343,8 @@ string AstVar::vlArgType(bool named, bool forReturn, bool forFunc, const string&
     string ostatic;
     if (isStatic() && namespc.empty()) ostatic = "static ";
 
-    bool isRef = isDpiOpenArray() || (forFunc && (isWritable() || direction().isRefOrConstRef()));
+    const bool isRef
+        = isDpiOpenArray() || (forFunc && (isWritable() || direction().isRefOrConstRef()));
 
     if (forFunc && isReadOnly() && isRef) ostatic = ostatic + "const ";
 
@@ -358,7 +359,7 @@ string AstVar::vlArgType(bool named, bool forReturn, bool forFunc, const string&
 string AstVar::vlEnumType() const {
     string arg;
     AstBasicDType* bdtypep = basicp();
-    bool strtype = bdtypep && bdtypep->keyword() == AstBasicDTypeKwd::STRING;
+    const bool strtype = bdtypep && bdtypep->keyword() == AstBasicDTypeKwd::STRING;
     if (bdtypep && bdtypep->keyword() == AstBasicDTypeKwd::CHARPTR) {
         return "VLVT_PTR";
     } else if (bdtypep && bdtypep->keyword() == AstBasicDTypeKwd::SCOPEPTR) {
@@ -648,7 +649,7 @@ public:
 };
 
 string AstNodeDType::cType(const string& name, bool forFunc, bool isRef) const {
-    CTypeRecursed info = cTypeRecurse(false);
+    const CTypeRecursed info = cTypeRecurse(false);
     return info.render(name, isRef);
 }
 
@@ -1251,8 +1252,9 @@ const char* AstClassPackage::broken() const {
     return nullptr;
 }
 void AstClass::insertCache(AstNode* nodep) {
-    bool doit = (VN_IS(nodep, Var) || VN_IS(nodep, EnumItemRef)
-                 || (VN_IS(nodep, NodeFTask) && !VN_CAST(nodep, NodeFTask)->isExternProto()));
+    const bool doit
+        = (VN_IS(nodep, Var) || VN_IS(nodep, EnumItemRef)
+           || (VN_IS(nodep, NodeFTask) && !VN_CAST(nodep, NodeFTask)->isExternProto()));
     if (doit) {
         if (m_members.find(nodep->name()) != m_members.end()) {
             nodep->v3error("Duplicate declaration of member name: " << nodep->prettyNameQ());
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index d47a2aa52..4fe2c3950 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -685,7 +685,7 @@ public:
         refDTypep(nullptr);
         setOp2p(rangep);
         dtypep(nullptr);  // V3Width will resolve
-        int width = subDTypep()->width() * rangep->elementsConst();
+        const int width = subDTypep()->width() * rangep->elementsConst();
         widthForce(width, width);
     }
     AstPackArrayDType(FileLine* fl, AstNodeDType* dtp, AstRange* rangep)
@@ -693,7 +693,7 @@ public:
         refDTypep(dtp);
         setOp2p(rangep);
         dtypep(this);
-        int width = subDTypep()->width() * rangep->elementsConst();
+        const int width = subDTypep()->width() * rangep->elementsConst();
         widthForce(width, width);
     }
     ASTNODE_NODE_FUNCS(PackArrayDType)
@@ -848,7 +848,7 @@ private:
         numeric(numer);
         if (!rangep && (wantwidth || wantwidthmin >= 0)) {  // Constant width
             if (wantwidth > 1) m.m_nrange.init(wantwidth - 1, 0, false);
-            int wmin = wantwidthmin >= 0 ? wantwidthmin : wantwidth;
+            const int wmin = wantwidthmin >= 0 ? wantwidthmin : wantwidth;
             widthForce(wantwidth, wmin);
         } else if (!rangep) {  // Set based on keyword properties
             // V3Width will pull from this width
diff --git a/src/V3AstUserAllocator.h b/src/V3AstUserAllocator.h
index 7ffb70f7b..f00e35550 100644
--- a/src/V3AstUserAllocator.h
+++ b/src/V3AstUserAllocator.h
@@ -36,19 +36,19 @@ private:
     inline T_Data* getUserp(T_Node* nodep) const {
         // This simplifies statically as T_UserN is constant. In C++17, use 'if constexpr'.
         if (T_UserN == 1) {
-            VNUser user = nodep->user1u();
+            const VNUser user = nodep->user1u();
             return user.to<T_Data*>();
         } else if (T_UserN == 2) {
-            VNUser user = nodep->user2u();
+            const VNUser user = nodep->user2u();
             return user.to<T_Data*>();
         } else if (T_UserN == 3) {
-            VNUser user = nodep->user3u();
+            const VNUser user = nodep->user3u();
             return user.to<T_Data*>();
         } else if (T_UserN == 4) {
-            VNUser user = nodep->user4u();
+            const VNUser user = nodep->user4u();
             return user.to<T_Data*>();
         } else {
-            VNUser user = nodep->user5u();
+            const VNUser user = nodep->user5u();
             return user.to<T_Data*>();
         }
     }
diff --git a/src/V3Begin.cpp b/src/V3Begin.cpp
index 8a9f2943c..9c1e3674a 100644
--- a/src/V3Begin.cpp
+++ b/src/V3Begin.cpp
@@ -117,7 +117,7 @@ private:
                 string dottedname = nodep->name() + "__DOT__";  // So always found
                 string::size_type pos;
                 while ((pos = dottedname.find("__DOT__")) != string::npos) {
-                    string ident = dottedname.substr(0, pos);
+                    const string ident = dottedname.substr(0, pos);
                     dottedname = dottedname.substr(pos + strlen("__DOT__"));
                     if (nodep->name() != "") m_namedScope = dot(m_namedScope, ident);
                     m_unnamedScope = dot(m_unnamedScope, ident);
diff --git a/src/V3Branch.cpp b/src/V3Branch.cpp
index 30560fb8e..b1a5de551 100644
--- a/src/V3Branch.cpp
+++ b/src/V3Branch.cpp
@@ -70,15 +70,15 @@ private:
             // Do if
             reset();
             iterateAndNextNull(nodep->ifsp());
-            int ifLikely = m_likely;
-            int ifUnlikely = m_unlikely;
+            const int ifLikely = m_likely;
+            const int ifUnlikely = m_unlikely;
             // Do else
             reset();
             iterateAndNextNull(nodep->elsesp());
-            int elseLikely = m_likely;
-            int elseUnlikely = m_unlikely;
+            const int elseLikely = m_likely;
+            const int elseUnlikely = m_unlikely;
             // Compute
-            int likeness = ifLikely - ifUnlikely - (elseLikely - elseUnlikely);
+            const int likeness = ifLikely - ifUnlikely - (elseLikely - elseUnlikely);
             if (likeness > 0) {
                 nodep->branchPred(VBranchPred::BP_LIKELY);
             } else if (likeness < 0) {
diff --git a/src/V3Broken.cpp b/src/V3Broken.cpp
index 613b4cf2f..3205ce912 100644
--- a/src/V3Broken.cpp
+++ b/src/V3Broken.cpp
@@ -72,7 +72,7 @@ public:
         UASSERT_OBJ(!(iter != s_nodes.end() && (iter->second & FLAG_ALLOCATED)), nodep,
                     "Newing AstNode object that is already allocated");
         if (iter == s_nodes.end()) {
-            int flags = FLAG_ALLOCATED;  // This int needed to appease GCC 4.1.2
+            const int flags = FLAG_ALLOCATED;  // This int needed to appease GCC 4.1.2
             s_nodes.emplace(nodep, flags);
         }
     }
@@ -103,7 +103,7 @@ public:
             UASSERT_OBJ(!(iter->second & FLAG_IN_TREE), nodep,
                         "AstNode is already in tree at another location");
         }
-        int or_flags = FLAG_IN_TREE | (linkable ? FLAG_LINKABLE : 0);
+        const int or_flags = FLAG_IN_TREE | (linkable ? FLAG_LINKABLE : 0);
         if (iter == s_nodes.end()) {
             s_nodes.emplace(nodep, or_flags);
         } else {
diff --git a/src/V3CCtors.cpp b/src/V3CCtors.cpp
index 3cc1a9344..2becaa25d 100644
--- a/src/V3CCtors.cpp
+++ b/src/V3CCtors.cpp
@@ -139,8 +139,8 @@ void V3CCtors::evalAsserts() {
         if (AstVar* varp = VN_CAST(np, Var)) {
             if (varp->isPrimaryInish() && !varp->isSc()) {
                 if (AstBasicDType* basicp = VN_CAST(varp->dtypeSkipRefp(), BasicDType)) {
-                    int storedWidth = basicp->widthAlignBytes() * 8;
-                    int lastWordWidth = varp->width() % storedWidth;
+                    const int storedWidth = basicp->widthAlignBytes() * 8;
+                    const int lastWordWidth = varp->width() % storedWidth;
                     if (lastWordWidth != 0) {
                         // if (signal & CONST(upper_non_clean_mask)) { fail; }
                         AstVarRef* const vrefp
diff --git a/src/V3Cdc.cpp b/src/V3Cdc.cpp
index 29e3114b0..22d2d0333 100644
--- a/src/V3Cdc.cpp
+++ b/src/V3Cdc.cpp
@@ -151,7 +151,7 @@ private:
             *m_ofp << "  ";
         }
         *m_ofp << nodep->prettyTypeName() << "\n";
-        string lastPrefix = m_prefix;
+        const string lastPrefix = m_prefix;
         m_prefix = lastPrefix + "1:";
         iterateAndNextNull(nodep->op1p());
         m_prefix = lastPrefix + "2:";
@@ -449,7 +449,7 @@ private:
         if (!vertexp->asyncPath() && level != 0) return false;  // Not part of path
 
         // Other logic in the path
-        string cont = prefix + sep;
+        const string cont = prefix + sep;
         string nextsep = "   ";
         for (V3GraphEdge* edgep = vertexp->inBeginp(); edgep; edgep = edgep->inNextp()) {
             CdcEitherVertex* eFromVertexp = static_cast<CdcEitherVertex*>(edgep->fromp());
@@ -506,7 +506,8 @@ private:
             }
         }
 
-        string filename = v3Global.opt.makeDir() + "/" + v3Global.opt.prefix() + "__cdc_edges.txt";
+        const string filename
+            = v3Global.opt.makeDir() + "/" + v3Global.opt.prefix() + "__cdc_edges.txt";
         const std::unique_ptr<std::ofstream> ofp(V3File::new_ofstream(filename));
         if (ofp->fail()) v3fatal("Can't write " << filename);
         *ofp << "Edge Report for " << v3Global.opt.prefix() << '\n';
@@ -523,7 +524,7 @@ private:
                     os.setf(std::ios::left);
                     // Module name - doesn't work due to flattening having lost the original
                     // so we assume the modulename matches the filebasename
-                    string fname = vvertexp->varScp()->fileline()->filebasename() + ":";
+                    const string fname = vvertexp->varScp()->fileline()->filebasename() + ":";
                     os << "  " << std::setw(20) << fname;
                     os << "  " << std::setw(8) << what;
                     os << "  " << std::setw(40) << vvertexp->varScp()->prettyName();
@@ -727,7 +728,7 @@ public:
     // CONSTRUCTORS
     explicit CdcVisitor(AstNode* nodep) {
         // Make report of all signal names and what clock edges they have
-        string filename = v3Global.opt.makeDir() + "/" + v3Global.opt.prefix() + "__cdc.txt";
+        const string filename = v3Global.opt.makeDir() + "/" + v3Global.opt.prefix() + "__cdc.txt";
         m_ofp = V3File::new_ofstream(filename);
         if (m_ofp->fail()) v3fatal("Can't write " << filename);
         m_ofFilename = filename;
diff --git a/src/V3Clean.cpp b/src/V3Clean.cpp
index ba0b91d6c..c9087bab7 100644
--- a/src/V3Clean.cpp
+++ b/src/V3Clean.cpp
@@ -68,7 +68,7 @@ private:
     void setCppWidth(AstNode* nodep) {
         nodep->user2(true);  // Don't resize it again
         AstNodeDType* old_dtypep = nodep->dtypep();
-        int width = cppWidth(nodep);  // widthMin is unchanged
+        const int width = cppWidth(nodep);  // widthMin is unchanged
         if (old_dtypep->width() != width) {
             // Since any given dtype's cppWidth() is the same, we can just
             // remember one conversion for each, and reuse it
@@ -103,7 +103,7 @@ private:
     void setCleanState(AstNode* nodep, CleanState clean) { nodep->user1(clean); }
     CleanState getCleanState(AstNode* nodep) { return static_cast<CleanState>(nodep->user1()); }
     bool isClean(AstNode* nodep) {
-        CleanState clstate = getCleanState(nodep);
+        const CleanState clstate = getCleanState(nodep);
         if (clstate == CS_CLEAN) return true;
         if (clstate == CS_DIRTY) return false;
         nodep->v3fatalSrc("Unknown clean state on node: " + nodep->prettyTypeName());
@@ -111,8 +111,9 @@ private:
     }
     void setClean(AstNode* nodep, bool isClean) {
         computeCppWidth(nodep);  // Just to be sure it's in widthMin
-        bool wholeUint = (nodep->widthMin() == VL_IDATASIZE || nodep->widthMin() == VL_QUADSIZE
-                          || (nodep->widthMin() % VL_EDATASIZE) == 0);
+        const bool wholeUint
+            = (nodep->widthMin() == VL_IDATASIZE || nodep->widthMin() == VL_QUADSIZE
+               || (nodep->widthMin() % VL_EDATASIZE) == 0);
         setCleanState(nodep, ((isClean || wholeUint) ? CS_CLEAN : CS_DIRTY));
     }
 
diff --git a/src/V3Clock.cpp b/src/V3Clock.cpp
index a02d4dcd1..ddb20dec0 100644
--- a/src/V3Clock.cpp
+++ b/src/V3Clock.cpp
@@ -219,7 +219,7 @@ private:
         if (ofuncp->finalsp()) tempp->addStmtsp(ofuncp->finalsp()->unlinkFrBackWithNext());
         while (tempp->stmtsp()) {
             AstNode* itemp = tempp->stmtsp()->unlinkFrBack();
-            int stmts = EmitCBaseCounterVisitor(itemp).count();
+            const int stmts = EmitCBaseCounterVisitor(itemp).count();
             if (!funcp || (func_stmts + stmts) > v3Global.opt.outputSplitCFuncs()) {
                 // Make a new function
                 funcp = new AstCFunc{ofuncp->fileline(), ofuncp->name() + cvtToStr(++funcnum),
diff --git a/src/V3Config.cpp b/src/V3Config.cpp
index eb02a0a72..6b511b6c7 100644
--- a/src/V3Config.cpp
+++ b/src/V3Config.cpp
@@ -201,7 +201,7 @@ public:
     }
 
     void applyBlock(AstNodeBlock* nodep) {
-        AstPragmaType pragma = AstPragmaType::COVERAGE_BLOCK_OFF;
+        const AstPragmaType pragma = AstPragmaType::COVERAGE_BLOCK_OFF;
         if (!nodep->unnamed()) {
             for (const string& i : m_coverageOffBlocks) {
                 if (VString::wildmatch(nodep->name(), i)) {
@@ -297,14 +297,14 @@ public:
 
     void applyBlock(AstNodeBlock* nodep) {
         // Apply to block at this line
-        AstPragmaType pragma = AstPragmaType::COVERAGE_BLOCK_OFF;
+        const AstPragmaType pragma = AstPragmaType::COVERAGE_BLOCK_OFF;
         if (lineMatch(nodep->fileline()->lineno(), pragma)) {
             nodep->addStmtsp(new AstPragma(nodep->fileline(), pragma));
         }
     }
     void applyCase(AstCase* nodep) {
         // Apply to this case at this line
-        int lineno = nodep->fileline()->lineno();
+        const int lineno = nodep->fileline()->lineno();
         if (lineMatch(lineno, AstPragmaType::FULL_CASE)) nodep->fullPragma(true);
         if (lineMatch(lineno, AstPragmaType::PARALLEL_CASE)) nodep->parallelPragma(true);
     }
@@ -313,7 +313,7 @@ public:
         if (m_lastIgnore.lineno != filelinep->lineno()) {
             // UINFO(9, "   ApplyIgnores for " << filelinep->ascii() << endl);
             // Process all on/offs for lines up to and including the current line
-            int curlineno = filelinep->lastLineno();
+            const int curlineno = filelinep->lastLineno();
             for (; m_lastIgnore.it != m_ignLines.end(); ++m_lastIgnore.it) {
                 if (m_lastIgnore.it->m_lineno > curlineno) break;
                 // UINFO(9, "     Hit " << *m_lastIt << endl);
diff --git a/src/V3Const.cpp b/src/V3Const.cpp
index 41bcda7cc..0a1fcdb91 100644
--- a/src/V3Const.cpp
+++ b/src/V3Const.cpp
@@ -376,10 +376,10 @@ class ConstBitOpTreeVisitor final : public AstNVisitor {
         AstAnd* andp = VN_CAST(nodep->lhsp(), And);
         CONST_BITOP_RETURN_IF(!andp, nodep->lhsp());
 
-        auto mask = findLeaf(andp->lhsp(), true);
+        const auto mask = findLeaf(andp->lhsp(), true);
         CONST_BITOP_RETURN_IF(!mask.m_constp || mask.m_lsb != 0, andp->lhsp());
 
-        LeafInfo leaf = findLeaf(andp->rhsp(), false);
+        const LeafInfo leaf = findLeaf(andp->rhsp(), false);
         CONST_BITOP_RETURN_IF(!leaf.m_refp, andp->rhsp());
 
         restorer.disableRestore();  // Now all subtree succeeded
@@ -394,7 +394,7 @@ class ConstBitOpTreeVisitor final : public AstNVisitor {
     }
 
     virtual void visit(AstNodeBiop* nodep) override {
-        auto isConst = [](AstNode* nodep, vluint64_t v) -> bool {
+        const auto isConst = [](AstNode* nodep, vluint64_t v) -> bool {
             AstConst* constp = VN_CAST(nodep, Const);
             return constp && constp->toUQuad() == v;
         };
@@ -452,16 +452,16 @@ class ConstBitOpTreeVisitor final : public AstNVisitor {
             Restorer restorer{*this};
             CONST_BITOP_RETURN_IF(!m_polarity, nodep);
             const bool maskFlip = isOrTree();
-            LeafInfo comp = findLeaf(nodep->lhsp(), true);
+            const LeafInfo comp = findLeaf(nodep->lhsp(), true);
             CONST_BITOP_RETURN_IF(!comp.m_constp || comp.m_lsb != 0, nodep->lhsp());
 
             AstAnd* andp = VN_CAST(nodep->rhsp(), And);  // comp == (mask & v)
             CONST_BITOP_RETURN_IF(!andp, nodep->rhsp());
 
-            LeafInfo mask = findLeaf(andp->lhsp(), true);
+            const LeafInfo mask = findLeaf(andp->lhsp(), true);
             CONST_BITOP_RETURN_IF(!mask.m_constp || mask.m_lsb != 0, andp->lhsp());
 
-            LeafInfo ref = findLeaf(andp->rhsp(), false);
+            const LeafInfo ref = findLeaf(andp->rhsp(), false);
             CONST_BITOP_RETURN_IF(!ref.m_refp, andp->rhsp());
 
             restorer.disableRestore();  // Now all checks passed
@@ -1002,7 +1002,7 @@ private:
             || lp->num().isFourState() || lp->num().isNegative()) {
             return false;
         }
-        int newLsb = lp->toSInt() + bp->toSInt();
+        const int newLsb = lp->toSInt() + bp->toSInt();
         if (newLsb + nodep->widthConst() > ap->width()) return false;
         //
         UINFO(9, "SEL(SHIFTR(a,b),l,w) -> SEL(a,l+b,w)\n");
@@ -1023,7 +1023,7 @@ private:
         AstExtend* extendp = VN_CAST(nodep->rhsp(), Extend);
         if (!extendp) return false;
         AstNode* smallerp = extendp->lhsp();
-        int subsize = smallerp->width();
+        const int subsize = smallerp->width();
         AstConst* constp = VN_CAST(nodep->lhsp(), Const);
         if (!constp) return false;
         if (!constp->num().isBitsZero(constp->width() - 1, subsize)) return false;
@@ -1048,7 +1048,7 @@ private:
         const AstExtend* extendp = VN_CAST_CONST(nodep->rhsp(), Extend);
         if (!extendp) return false;
         AstNode* smallerp = extendp->lhsp();
-        int subsize = smallerp->width();
+        const int subsize = smallerp->width();
         const AstConst* constp = VN_CAST_CONST(nodep->lhsp(), Const);
         if (!constp) return false;
         if (constp->num().isBitsZero(constp->width() - 1, subsize)) return false;
@@ -1079,10 +1079,10 @@ private:
         }
         // Find range of dtype we are selecting from
         // Similar code in V3Unknown::AstSel
-        bool doit = true;
+        const bool doit = true;
         if (m_warn && VN_IS(nodep->lsbp(), Const) && VN_IS(nodep->widthp(), Const) && doit) {
-            int maxDeclBit = nodep->declRange().hiMaxSelect() * nodep->declElWidth()
-                             + (nodep->declElWidth() - 1);
+            const int maxDeclBit = nodep->declRange().hiMaxSelect() * nodep->declElWidth()
+                                   + (nodep->declElWidth() - 1);
             if (VN_CAST(nodep->lsbp(), Const)->num().isFourState()
                 || VN_CAST(nodep->widthp(), Const)->num().isFourState()) {
                 nodep->v3error("Selection index is constantly unknown or tristated: "
@@ -1157,7 +1157,7 @@ private:
         const AstConst* lwidth = VN_CAST_CONST(lhsp->widthp(), Const);
         const AstConst* rwidth = VN_CAST_CONST(rhsp->widthp(), Const);
         if (!lstart || !rstart || !lwidth || !rwidth) return false;  // too complicated
-        int rend = (rstart->toSInt() + rwidth->toSInt());
+        const int rend = (rstart->toSInt() + rwidth->toSInt());
         return (rend == lstart->toSInt());
     }
     bool ifMergeAdjacent(AstNode* lhsp, AstNode* rhsp) {
@@ -1190,7 +1190,7 @@ private:
         AstConst* lwidth = VN_CAST(lselp->widthp(), Const);
         AstConst* rwidth = VN_CAST(rselp->widthp(), Const);
         if (!lstart || !rstart || !lwidth || !rwidth) return false;  // too complicated
-        int rend = (rstart->toSInt() + rwidth->toSInt());
+        const int rend = (rstart->toSInt() + rwidth->toSInt());
         // a[i:j] a[j-1:k]
         if (rend == lstart->toSInt()) return true;
         // a[i:0] a[msb:j]
@@ -1207,8 +1207,8 @@ private:
         const AstNodeBiop* rp = VN_CAST_CONST(rhsp, NodeBiop);
         if (!lp || !rp) return false;
         // {a[]&b[], a[]&b[]}
-        bool lad = ifMergeAdjacent(lp->lhsp(), rp->lhsp());
-        bool rad = ifMergeAdjacent(lp->rhsp(), rp->rhsp());
+        const bool lad = ifMergeAdjacent(lp->lhsp(), rp->lhsp());
+        const bool rad = ifMergeAdjacent(lp->rhsp(), rp->rhsp());
         if (lad && rad) return true;
         // {a[] & b[]&c[], a[] & b[]&c[]}
         if (lad && concatMergeable(lp->rhsp(), rp->rhsp())) return true;
@@ -1449,10 +1449,10 @@ private:
         // {a[1], a[0]} -> a[1:0]
         AstSel* lselp = VN_CAST(nodep->lhsp()->unlinkFrBack(), Sel);
         AstSel* rselp = VN_CAST(nodep->rhsp()->unlinkFrBack(), Sel);
-        int lstart = lselp->lsbConst();
-        int lwidth = lselp->widthConst();
-        int rstart = rselp->lsbConst();
-        int rwidth = rselp->widthConst();
+        const int lstart = lselp->lsbConst();
+        const int lwidth = lselp->widthConst();
+        const int rstart = rselp->lsbConst();
+        const int rwidth = rselp->widthConst();
 
         UASSERT_OBJ((rstart + rwidth) == lstart, nodep,
                     "tried to merge two selects which are not adjacent");
@@ -1513,7 +1513,7 @@ private:
     }
     void replaceMulShift(AstMul* nodep) {  // Mul, but not MulS as not simple shift
         UINFO(5, "MUL(2^n,b)->SHIFTL(b,n) " << nodep << endl);
-        int amount = VN_CAST(nodep->lhsp(), Const)->num().mostSetBitP1() - 1;  // 2^n->n+1
+        const int amount = VN_CAST(nodep->lhsp(), Const)->num().mostSetBitP1() - 1;  // 2^n->n+1
         AstNode* opp = nodep->rhsp()->unlinkFrBack();
         AstShiftL* newp
             = new AstShiftL(nodep->fileline(), opp, new AstConst(nodep->fileline(), amount));
@@ -1523,7 +1523,7 @@ private:
     }
     void replaceDivShift(AstDiv* nodep) {  // Mul, but not MulS as not simple shift
         UINFO(5, "DIV(b,2^n)->SHIFTR(b,n) " << nodep << endl);
-        int amount = VN_CAST(nodep->rhsp(), Const)->num().mostSetBitP1() - 1;  // 2^n->n+1
+        const int amount = VN_CAST(nodep->rhsp(), Const)->num().mostSetBitP1() - 1;  // 2^n->n+1
         AstNode* opp = nodep->lhsp()->unlinkFrBack();
         AstShiftR* newp
             = new AstShiftR(nodep->fileline(), opp, new AstConst(nodep->fileline(), amount));
@@ -1533,7 +1533,7 @@ private:
     }
     void replaceModAnd(AstModDiv* nodep) {  // Mod, but not ModS as not simple shift
         UINFO(5, "MOD(b,2^n)->AND(b,2^n-1) " << nodep << endl);
-        int amount = VN_CAST(nodep->rhsp(), Const)->num().mostSetBitP1() - 1;  // 2^n->n+1
+        const int amount = VN_CAST(nodep->rhsp(), Const)->num().mostSetBitP1() - 1;  // 2^n->n+1
         V3Number mask(nodep, nodep->width());
         mask.setMask(amount);
         AstNode* opp = nodep->lhsp()->unlinkFrBack();
@@ -1576,7 +1576,7 @@ private:
         if (nodep->type() == lhsp->type()) {
             int shift1 = VN_CAST(shift1p, Const)->toUInt();
             int shift2 = VN_CAST(shift2p, Const)->toUInt();
-            int newshift = shift1 + shift2;
+            const int newshift = shift1 + shift2;
             VL_DO_DANGLING(shift1p->deleteTree(), shift1p);
             VL_DO_DANGLING(shift2p->deleteTree(), shift2p);
             nodep->lhsp(ap);
@@ -1588,7 +1588,7 @@ private:
             if (VN_IS(lhsp, ShiftR)) shift1 = -shift1;
             int shift2 = VN_CAST(shift2p, Const)->toUInt();
             if (VN_IS(nodep, ShiftR)) shift2 = -shift2;
-            int newshift = shift1 + shift2;
+            const int newshift = shift1 + shift2;
             VL_DO_DANGLING(shift1p->deleteTree(), shift1p);
             VL_DO_DANGLING(shift2p->deleteTree(), shift2p);
             AstNode* newp;
@@ -1656,7 +1656,7 @@ private:
             && (con2p->toSInt() != con1p->toSInt() + sel1p->width())) {
             return false;
         }
-        bool lsbFirstAssign = (con1p->toUInt() < con2p->toUInt());
+        const bool lsbFirstAssign = (con1p->toUInt() < con2p->toUInt());
         UINFO(4, "replaceAssignMultiSel " << nodep << endl);
         UINFO(4, "                   && " << nextp << endl);
         // nodep->dumpTree(cout, "comb1: ");
@@ -1815,8 +1815,8 @@ private:
             return true;
         } else if (m_doV && VN_IS(nodep->lhsp(), StreamL)) {
             // Push the stream operator to the rhs of the assignment statement
-            int dWidth = VN_CAST(nodep->lhsp(), StreamL)->lhsp()->width();
-            int sWidth = nodep->rhsp()->width();
+            const int dWidth = VN_CAST(nodep->lhsp(), StreamL)->lhsp()->width();
+            const int sWidth = nodep->rhsp()->width();
             // Unlink the stuff
             AstNode* dstp = VN_CAST(nodep->lhsp(), StreamL)->lhsp()->unlinkFrBack();
             AstNode* streamp = VN_CAST(nodep->lhsp(), StreamL)->unlinkFrBack();
@@ -1836,8 +1836,8 @@ private:
             // The right stream operator on lhs of assignment statement does
             // not reorder bits. However, if the rhs is wider than the lhs,
             // then we select bits from the left-most, not the right-most.
-            int dWidth = VN_CAST(nodep->lhsp(), StreamR)->lhsp()->width();
-            int sWidth = nodep->rhsp()->width();
+            const int dWidth = VN_CAST(nodep->lhsp(), StreamR)->lhsp()->width();
+            const int sWidth = nodep->rhsp()->width();
             // Unlink the stuff
             AstNode* dstp = VN_CAST(nodep->lhsp(), StreamR)->lhsp()->unlinkFrBack();
             AstNode* sizep = VN_CAST(nodep->lhsp(), StreamR)->rhsp()->unlinkFrBack();
@@ -2666,7 +2666,7 @@ private:
             string fmt;
             bool inPct = false;
             AstNode* argp = nodep->exprsp();
-            string text = nodep->text();
+            const string text = nodep->text();
             for (const char ch : text) {
                 if (!inPct && ch == '%') {
                     inPct = true;
@@ -2688,7 +2688,8 @@ private:
                         if (argp) {
                             AstNode* nextp = argp->nextp();
                             if (VN_IS(argp, Const)) {  // Convert it
-                                string out = VN_CAST(argp, Const)->num().displayed(nodep, fmt);
+                                const string out
+                                    = VN_CAST(argp, Const)->num().displayed(nodep, fmt);
                                 UINFO(9, "     DispConst: " << fmt << " -> " << out << "  for "
                                                             << argp << endl);
                                 // fmt = out w/ replace % with %% as it must be literal.
@@ -2726,10 +2727,10 @@ private:
         iterateChildren(nodep);
     }
     virtual void visit(AstWhile* nodep) override {
-        bool oldHasJumpDelay = m_hasJumpDelay;
+        const bool oldHasJumpDelay = m_hasJumpDelay;
         m_hasJumpDelay = false;
         { iterateChildren(nodep); }
-        bool thisWhileHasJumpDelay = m_hasJumpDelay;
+        const bool thisWhileHasJumpDelay = m_hasJumpDelay;
         m_hasJumpDelay = thisWhileHasJumpDelay || oldHasJumpDelay;
         if (m_doNConst) {
             if (nodep->condp()->isZero()) {
diff --git a/src/V3Coverage.cpp b/src/V3Coverage.cpp
index b2fa737d3..2f9524df8 100644
--- a/src/V3Coverage.cpp
+++ b/src/V3Coverage.cpp
@@ -92,7 +92,7 @@ private:
         // See also similar rule in V3TraceDecl::varIgnoreTrace
         if (!nodep->isToggleCoverable()) return "Not relevant signal type";
         if (!v3Global.opt.coverageUnderscore()) {
-            string prettyName = nodep->prettyName();
+            const string prettyName = nodep->prettyName();
             if (prettyName[0] == '_') return "Leading underscore";
             if (prettyName.find("._") != string::npos) return "Inlined leading underscore";
         }
@@ -114,7 +114,7 @@ private:
         // Note the module name could have parameters appended, we'll consider this
         // a feature as it allows for each parameterized block to be counted separately.
         // Someday the user might be allowed to specify a different page suffix
-        string page = page_prefix + "/" + m_modp->prettyName();
+        const string page = page_prefix + "/" + m_modp->prettyName();
 
         AstCoverDecl* declp = new AstCoverDecl(fl, page, comment, linescov, offset);
         declp->hier(hier);
@@ -144,7 +144,7 @@ private:
         if (it == m_varnames.end()) {
             m_varnames.emplace(name, 1);
         } else {
-            int suffix = (it->second)++;
+            const int suffix = (it->second)++;
             name += "_" + cvtToStr(suffix);
         }
         return name;
@@ -278,7 +278,7 @@ private:
                 //      We'll do this, and make the if(...) coverinc later.
 
                 // Add signal to hold the old value
-                string newvarname = string("__Vtogcov__") + nodep->shortName();
+                const string newvarname = string("__Vtogcov__") + nodep->shortName();
                 AstVar* chgVarp
                     = new AstVar(nodep->fileline(), AstVarType::MODULETEMP, newvarname, nodep);
                 chgVarp->fileline()->modifyWarnOff(V3ErrorCode::UNUSED, true);
@@ -312,7 +312,7 @@ private:
             if (bdtypep->isRanged()) {
                 for (int index_docs = bdtypep->lo(); index_docs < bdtypep->hi() + 1;
                      ++index_docs) {
-                    int index_code = index_docs - bdtypep->lo();
+                    const int index_code = index_docs - bdtypep->lo();
                     ToggleEnt newent(above.m_comment + string("[") + cvtToStr(index_docs) + "]",
                                      new AstSel(varp->fileline(), above.m_varRefp->cloneTree(true),
                                                 index_code, 1),
@@ -326,7 +326,7 @@ private:
             }
         } else if (AstUnpackArrayDType* adtypep = VN_CAST(dtypep, UnpackArrayDType)) {
             for (int index_docs = adtypep->lo(); index_docs <= adtypep->hi(); ++index_docs) {
-                int index_code = index_docs - adtypep->lo();
+                const int index_code = index_docs - adtypep->lo();
                 ToggleEnt newent(above.m_comment + string("[") + cvtToStr(index_docs) + "]",
                                  new AstArraySel(varp->fileline(),
                                                  above.m_varRefp->cloneTree(true), index_code),
@@ -339,7 +339,7 @@ private:
         } else if (AstPackArrayDType* adtypep = VN_CAST(dtypep, PackArrayDType)) {
             for (int index_docs = adtypep->lo(); index_docs <= adtypep->hi(); ++index_docs) {
                 AstNodeDType* subtypep = adtypep->subDTypep()->skipRefp();
-                int index_code = index_docs - adtypep->lo();
+                const int index_code = index_docs - adtypep->lo();
                 ToggleEnt newent(above.m_comment + string("[") + cvtToStr(index_docs) + "]",
                                  new AstSel(varp->fileline(), above.m_varRefp->cloneTree(true),
                                             index_code * subtypep->width(), subtypep->width()),
@@ -354,7 +354,7 @@ private:
             for (AstMemberDType* itemp = adtypep->membersp(); itemp;
                  itemp = VN_CAST(itemp->nextp(), MemberDType)) {
                 AstNodeDType* subtypep = itemp->subDTypep()->skipRefp();
-                int index_code = itemp->lsb();
+                const int index_code = itemp->lsb();
                 ToggleEnt newent(above.m_comment + string(".") + itemp->name(),
                                  new AstSel(varp->fileline(), above.m_varRefp->cloneTree(true),
                                             index_code, subtypep->width()),
@@ -385,17 +385,18 @@ private:
         UINFO(4, " IF: " << nodep << endl);
         if (m_state.m_on) {
             // An else-if.  When we iterate the if, use "elsif" marking
-            bool elsif = nodep->ifsp() && VN_IS(nodep->elsesp(), If) && !nodep->elsesp()->nextp();
+            const bool elsif
+                = nodep->ifsp() && VN_IS(nodep->elsesp(), If) && !nodep->elsesp()->nextp();
             if (elsif) VN_CAST(nodep->elsesp(), If)->user1(true);
-            bool first_elsif = !nodep->user1() && elsif;
-            bool cont_elsif = nodep->user1() && elsif;
-            bool final_elsif = nodep->user1() && !elsif && nodep->elsesp();
+            const bool first_elsif = !nodep->user1() && elsif;
+            const bool cont_elsif = nodep->user1() && elsif;
+            const bool final_elsif = nodep->user1() && !elsif && nodep->elsesp();
             //
             // Considered: If conditional is on a different line from if/else then we
             // can show it as part of line coverage of the statement
             // above. Otherwise show it based on what is inside.
             // But: Seemed too complicated, and fragile.
-            CheckState lastState = m_state;
+            const CheckState lastState = m_state;
             CheckState ifState;
             CheckState elseState;
             {
diff --git a/src/V3Delayed.cpp b/src/V3Delayed.cpp
index 66d1ff33e..3e3cd280f 100644
--- a/src/V3Delayed.cpp
+++ b/src/V3Delayed.cpp
@@ -110,7 +110,7 @@ private:
         if (!lastrefp) {
             vscp->user5p(nodep);
         } else {
-            bool last_was_blocking = lastrefp->user5();
+            const bool last_was_blocking = lastrefp->user5();
             if (last_was_blocking != blocking) {
                 AstNode* nonblockingp = blocking ? nodep : lastrefp;
                 AstNode* blockingp = blocking ? lastrefp : nodep;
@@ -228,7 +228,7 @@ private:
         UASSERT_OBJ(varrefp->varScopep(), varrefp, "Var didn't get varscoped in V3Scope.cpp");
         varrefp->unlinkFrBack();
         AstVar* oldvarp = varrefp->varp();
-        int modVecNum = m_scopeVecMap[varrefp->varScopep()]++;
+        const int modVecNum = m_scopeVecMap[varrefp->varScopep()]++;
         //
         std::deque<AstNode*> dimreadps;  // Read value for each dimension of assignment
         for (unsigned dimension = 0; dimension < dimvalp.size(); dimension++) {
@@ -236,8 +236,8 @@ private:
             if (VN_IS(dimp, Const)) {  // bit = const, can just use it
                 dimreadps.push_front(dimp);
             } else {
-                string bitvarname = (string("__Vdlyvdim") + cvtToStr(dimension) + "__"
-                                     + oldvarp->shortName() + "__v" + cvtToStr(modVecNum));
+                const string bitvarname = (string("__Vdlyvdim") + cvtToStr(dimension) + "__"
+                                           + oldvarp->shortName() + "__v" + cvtToStr(modVecNum));
                 AstVarScope* bitvscp
                     = createVarSc(varrefp->varScopep(), bitvarname, dimp->width(), nullptr);
                 AstAssign* bitassignp = new AstAssign(
@@ -256,8 +256,8 @@ private:
                 // vlsb = constant, can just push constant into where we use it
                 bitreadp = lsbvaluep;
             } else {
-                string bitvarname = (string("__Vdlyvlsb__") + oldvarp->shortName() + "__v"
-                                     + cvtToStr(modVecNum));
+                const string bitvarname = (string("__Vdlyvlsb__") + oldvarp->shortName() + "__v"
+                                           + cvtToStr(modVecNum));
                 AstVarScope* bitvscp
                     = createVarSc(varrefp->varScopep(), bitvarname, lsbvaluep->width(), nullptr);
                 AstAssign* bitassignp = new AstAssign(
@@ -440,7 +440,7 @@ private:
                     checkActivePost(nodep, oldactivep);
                 }
                 if (!dlyvscp) {  // First use of this delayed variable
-                    string newvarname = (string("__Vdly__") + nodep->varp()->shortName());
+                    const string newvarname = (string("__Vdly__") + nodep->varp()->shortName());
                     dlyvscp = createVarSc(oldvscp, newvarname, 0, nullptr);
                     AstNodeAssign* prep;
                     AstBasicDType* basicp = oldvscp->dtypep()->basicp();
diff --git a/src/V3Depth.cpp b/src/V3Depth.cpp
index 789cf8359..9aef1f3b6 100644
--- a/src/V3Depth.cpp
+++ b/src/V3Depth.cpp
@@ -52,7 +52,7 @@ private:
         UINFO(6, "  Deep  " << nodep << endl);
         // if (debug() >= 9) nodep->dumpTree(cout, "deep:");
 
-        string newvarname = (string("__Vdeeptemp") + cvtToStr(m_modp->varNumGetInc()));
+        const string newvarname = (string("__Vdeeptemp") + cvtToStr(m_modp->varNumGetInc()));
         AstVar* varp
             = new AstVar(nodep->fileline(), AstVarType::STMTTEMP, newvarname, nodep->dtypep());
         UASSERT_OBJ(m_cfuncp, nodep, "Deep expression not under a function");
diff --git a/src/V3Descope.cpp b/src/V3Descope.cpp
index a1f5453bd..b6057ae85 100644
--- a/src/V3Descope.cpp
+++ b/src/V3Descope.cpp
@@ -111,7 +111,7 @@ private:
         // If for any given name only one function exists, we can use that function directly.
         // If multiple functions exist, we need to select the appropriate scope.
         for (FuncMmap::iterator it = m_modFuncs.begin(); it != m_modFuncs.end(); ++it) {
-            string name = it->first;
+            const string name = it->first;
             AstCFunc* topFuncp = it->second;
             auto nextIt1 = it;
             ++nextIt1;
@@ -133,7 +133,8 @@ private:
                     AstCFunc* funcp = eachIt->second;
                     auto nextIt2 = eachIt;
                     ++nextIt2;
-                    bool moreOfSame = (nextIt2 != m_modFuncs.end() && nextIt2->first == name);
+                    const bool moreOfSame
+                        = (nextIt2 != m_modFuncs.end() && nextIt2->first == name);
                     UASSERT_OBJ(funcp->scopep(), funcp, "Not scoped");
 
                     UINFO(6, "     Wrapping " << name << " " << funcp << endl);
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index b8f870f21..ea505740b 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -561,7 +561,7 @@ public:
         // displays are handled in AstDisplay
         if (!nodep->dpiExport()) {
             // this is where the DPI import context scope is set
-            string scope = nodep->scopeDpiName();
+            const string scope = nodep->scopeDpiName();
             putbs("(&(vlSymsp->" + protect("__Vscope_" + scope) + "))");
         }
     }
@@ -1520,15 +1520,15 @@ class EmitCImp final : EmitCStmts {
         if (v3Global.opt.lintOnly()) {
             // Unfortunately we have some lint checks here, so we can't just skip processing.
             // We should move them to a different stage.
-            string filename = VL_DEV_NULL;
+            const string filename = VL_DEV_NULL;
             newCFile(filename, slow, source);
             ofp = new V3OutCFile(filename);
         } else if (optSystemC()) {
-            string filename = filenameNoExt + (source ? ".cpp" : ".h");
+            const string filename = filenameNoExt + (source ? ".cpp" : ".h");
             newCFile(filename, slow, source);
             ofp = new V3OutScFile(filename);
         } else {
-            string filename = filenameNoExt + (source ? ".cpp" : ".h");
+            const string filename = filenameNoExt + (source ? ".cpp" : ".h");
             newCFile(filename, slow, source);
             ofp = new V3OutCFile(filename);
         }
@@ -1800,30 +1800,30 @@ class EmitCImp final : EmitCStmts {
         // Returns string to do resetting, empty to do nothing (which caller should handle)
         if (AstAssocArrayDType* adtypep = VN_CAST(dtypep, AssocArrayDType)) {
             // Access std::array as C array
-            string cvtarray = (adtypep->subDTypep()->isWide() ? ".data()" : "");
+            const string cvtarray = (adtypep->subDTypep()->isWide() ? ".data()" : "");
             return emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(), depth + 1,
                                        suffix + ".atDefault()" + cvtarray);
         } else if (VN_IS(dtypep, ClassRefDType)) {
             return "";  // Constructor does it
         } else if (AstDynArrayDType* adtypep = VN_CAST(dtypep, DynArrayDType)) {
             // Access std::array as C array
-            string cvtarray = (adtypep->subDTypep()->isWide() ? ".data()" : "");
+            const string cvtarray = (adtypep->subDTypep()->isWide() ? ".data()" : "");
             return emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(), depth + 1,
                                        suffix + ".atDefault()" + cvtarray);
         } else if (AstQueueDType* adtypep = VN_CAST(dtypep, QueueDType)) {
             // Access std::array as C array
-            string cvtarray = (adtypep->subDTypep()->isWide() ? ".data()" : "");
+            const string cvtarray = (adtypep->subDTypep()->isWide() ? ".data()" : "");
             return emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(), depth + 1,
                                        suffix + ".atDefault()" + cvtarray);
         } else if (AstUnpackArrayDType* adtypep = VN_CAST(dtypep, UnpackArrayDType)) {
             UASSERT_OBJ(adtypep->hi() >= adtypep->lo(), varp,
                         "Should have swapped msb & lsb earlier.");
-            string ivar = string("__Vi") + cvtToStr(depth);
-            string pre = ("for (int " + ivar + "=" + cvtToStr(0) + "; " + ivar + "<"
-                          + cvtToStr(adtypep->elementsConst()) + "; ++" + ivar + ") {\n");
-            string below = emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(),
-                                               depth + 1, suffix + "[" + ivar + "]");
-            string post = "}\n";
+            const string ivar = string("__Vi") + cvtToStr(depth);
+            const string pre = ("for (int " + ivar + "=" + cvtToStr(0) + "; " + ivar + "<"
+                                + cvtToStr(adtypep->elementsConst()) + "; ++" + ivar + ") {\n");
+            const string below = emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(),
+                                                     depth + 1, suffix + "[" + ivar + "]");
+            const string post = "}\n";
             return below.empty() ? "" : pre + below + post;
         } else if (basicp && basicp->keyword() == AstBasicDTypeKwd::STRING) {
             // String's constructor deals with it
@@ -2224,9 +2224,9 @@ void EmitCStmts::displayEmit(AstNode* nodep, bool isScan) {
         ofp()->putsQuoted(emitDispState.m_format);
         // Arguments
         for (unsigned i = 0; i < emitDispState.m_argsp.size(); i++) {
-            char fmt = emitDispState.m_argsChar[i];
+            const char fmt = emitDispState.m_argsChar[i];
             AstNode* argp = emitDispState.m_argsp[i];
-            string func = emitDispState.m_argsFunc[i];
+            const string func = emitDispState.m_argsFunc[i];
             if (func != "" || argp) {
                 puts(",");
                 ofp()->indentInc();
@@ -2234,7 +2234,7 @@ void EmitCStmts::displayEmit(AstNode* nodep, bool isScan) {
                 if (func != "") {
                     puts(func);
                 } else if (argp) {
-                    bool addrof = isScan || (fmt == '@');
+                    const bool addrof = isScan || (fmt == '@');
                     if (addrof) puts("&(");
                     iterate(argp);
                     if (!addrof) emitDatap(argp);
@@ -2287,7 +2287,7 @@ void EmitCStmts::displayArg(AstNode* dispp, AstNode** elistp, bool isScan, const
         // + 1.0 rounding bias.
         double dchars = mantissabits / 3.321928094887362 + 1.0;
         if (fmtLetter == 'd') dchars++;  // space for sign
-        int nchars = int(dchars);
+        const int nchars = int(dchars);
         pfmt = string("%") + cvtToStr(nchars) + fmtLetter;
     } else {
         pfmt = string("%") + vfmt + fmtLetter;
@@ -2392,7 +2392,7 @@ void EmitCStmts::displayNode(AstNode* nodep, AstScopeName* scopenamep, const str
             case 'z': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'z'); break;
             case 'm': {
                 UASSERT_OBJ(scopenamep, nodep, "Display with %m but no AstScopeName");
-                string suffix = scopenamep->scopePrettySymName();
+                const string suffix = scopenamep->scopePrettySymName();
                 if (suffix == "") {
                     emitDispState.pushFormat("%S");
                 } else {
@@ -2613,9 +2613,9 @@ void EmitCImp::emitSavableImp(AstNodeModule* modp) {
     if (v3Global.opt.savable()) {
         puts("\n// Savable\n");
         for (int de = 0; de < 2; ++de) {
-            string classname = de ? "VerilatedDeserialize" : "VerilatedSerialize";
-            string funcname = de ? "__Vdeserialize" : "__Vserialize";
-            string op = de ? ">>" : "<<";
+            const string classname = de ? "VerilatedDeserialize" : "VerilatedSerialize";
+            const string funcname = de ? "__Vdeserialize" : "__Vserialize";
+            const string op = de ? ">>" : "<<";
             // NOLINTNEXTLINE(performance-inefficient-string-concatenation)
             puts("void " + prefixNameProtect(modp) + "::" + protect(funcname) + "(" + classname
                  + "& os) {\n");
@@ -2657,10 +2657,10 @@ void EmitCImp::emitSavableImp(AstNodeModule* modp) {
                         AstNodeDType* elementp = varp->dtypeSkipRefp();
                         for (AstUnpackArrayDType* arrayp = VN_CAST(elementp, UnpackArrayDType);
                              arrayp; arrayp = VN_CAST(elementp, UnpackArrayDType)) {
-                            int vecnum = vects++;
+                            const int vecnum = vects++;
                             UASSERT_OBJ(arrayp->hi() >= arrayp->lo(), varp,
                                         "Should have swapped msb & lsb earlier.");
-                            string ivar = string("__Vi") + cvtToStr(vecnum);
+                            const string ivar = string("__Vi") + cvtToStr(vecnum);
                             puts("for (int __Vi" + cvtToStr(vecnum) + "=" + cvtToStr(0));
                             puts("; " + ivar + "<" + cvtToStr(arrayp->elementsConst()));
                             puts("; ++" + ivar + ") {\n");
@@ -2673,8 +2673,8 @@ void EmitCImp::emitSavableImp(AstNodeModule* modp) {
                         // (i.e. packed types of more than 64 bits).
                         if (elementp->isWide()
                             && !(basicp && basicp->keyword() == AstBasicDTypeKwd::STRING)) {
-                            int vecnum = vects++;
-                            string ivar = string("__Vi") + cvtToStr(vecnum);
+                            const int vecnum = vects++;
+                            const string ivar = string("__Vi") + cvtToStr(vecnum);
                             puts("for (int __Vi" + cvtToStr(vecnum) + "=" + cvtToStr(0));
                             puts("; " + ivar + "<" + cvtToStr(elementp->widthWords()));
                             puts("; ++" + ivar + ") {\n");
@@ -2731,10 +2731,10 @@ void EmitCImp::emitSensitives() {
                          = VN_CAST(varp->dtypeSkipRefp(), UnpackArrayDType);
                          arrayp;
                          arrayp = VN_CAST(arrayp->subDTypep()->skipRefp(), UnpackArrayDType)) {
-                        int vecnum = vects++;
+                        const int vecnum = vects++;
                         UASSERT_OBJ(arrayp->hi() >= arrayp->lo(), varp,
                                     "Should have swapped msb & lsb earlier.");
-                        string ivar = string("__Vi") + cvtToStr(vecnum);
+                        const string ivar = string("__Vi") + cvtToStr(vecnum);
                         puts("for (int __Vi" + cvtToStr(vecnum) + "=" + cvtToStr(arrayp->lo()));
                         puts("; " + ivar + "<=" + cvtToStr(arrayp->hi()));
                         puts("; ++" + ivar + ") {\n");
@@ -2947,7 +2947,7 @@ void EmitCStmts::emitVarList(AstNode* firstp, EisWhich which, const string& pref
                 }
                 if (varp->isStatic() ? !isstatic : isstatic) doit = false;
                 if (doit) {
-                    int sigbytes = varp->dtypeSkipRefp()->widthAlignBytes();
+                    const int sigbytes = varp->dtypeSkipRefp()->widthAlignBytes();
                     int sortbytes = 9;
                     if (varp->isUsedClock() && varp->widthMin() == 1) {
                         sortbytes = 0;
@@ -2966,13 +2966,14 @@ void EmitCStmts::emitVarList(AstNode* firstp, EisWhich which, const string& pref
                     } else if (sigbytes == 1) {
                         sortbytes = 1;
                     }
-                    bool anonOk = (v3Global.opt.compLimitMembers() != 0  // Enabled
-                                   && !varp->isStatic() && !varp->isIO()  // Confusing to user
-                                   && !varp->isSc()  // Aggregates can't be anon
-                                   && (varp->basicp()
-                                       && !varp->basicp()->isOpaque())  // Aggregates can't be anon
-                                   && which != EVL_FUNC_ALL);  // Anon not legal in funcs, and gcc
-                                                               // bug free there anyhow
+                    const bool anonOk
+                        = (v3Global.opt.compLimitMembers() != 0  // Enabled
+                           && !varp->isStatic() && !varp->isIO()  // Confusing to user
+                           && !varp->isSc()  // Aggregates can't be anon
+                           && (varp->basicp()
+                               && !varp->basicp()->isOpaque())  // Aggregates can't be anon
+                           && which != EVL_FUNC_ALL);  // Anon not legal in funcs, and gcc
+                                                       // bug free there anyhow
                     if (anonOk) {
                         varAnonMap[sortbytes].push_back(varp);
                     } else {
@@ -3013,7 +3014,7 @@ void EmitCStmts::emitVarSort(const VarSortMap& vmap, VarVec* sortedp) {
     using MTaskVarSortMap = std::map<const MTaskIdSet, VarSortMap>;
     MTaskVarSortMap m2v;
     for (VarSortMap::const_iterator it = vmap.begin(); it != vmap.end(); ++it) {
-        int size_class = it->first;
+        const int size_class = it->first;
         const VarVec& vec = it->second;
         for (const AstVar* varp : vec) { m2v[varp->mtaskIds()][size_class].push_back(varp); }
     }
@@ -3048,8 +3049,8 @@ void EmitCStmts::emitSortedVarList(const VarVec& anons, const VarVec& nonanons,
     string curVarCmt;
     // Output anons
     {
-        int anonMembers = anons.size();
-        int lim = v3Global.opt.compLimitMembers();
+        const int anonMembers = anons.size();
+        const int lim = v3Global.opt.compLimitMembers();
         int anonL3s = 1;
         int anonL2s = 1;
         int anonL1s = 1;
@@ -3643,8 +3644,8 @@ class EmitCTrace final : EmitCStmts {
             }
             //
             // fstVarType
-            AstVarType vartype = nodep->varType();
-            AstBasicDTypeKwd kwd = nodep->declKwd();
+            const AstVarType vartype = nodep->varType();
+            const AstBasicDTypeKwd kwd = nodep->declKwd();
             string fstvt;
             // Doubles have special decoding properties, so must indicate if a double
             if (nodep->dtypep()->basicp()->isDouble()) {
@@ -3902,7 +3903,7 @@ class EmitCTrace final : EmitCStmts {
         }
     }
     virtual void visit(AstTraceDecl* nodep) override {
-        int enumNum = emitTraceDeclDType(nodep->dtypep());
+        const int enumNum = emitTraceDeclDType(nodep->dtypep());
         if (nodep->arrayRange().ranged()) {
             puts("{int i; for (i=0; i<" + cvtToStr(nodep->arrayRange().elements()) + "; i++) {\n");
             emitTraceInitOne(nodep, enumNum);
@@ -3947,7 +3948,7 @@ public:
 
 static void setParentClassPointers() {
     // Set user4p in all CFunc and Var to point to the containing AstNodeModule
-    auto setAll = [](AstNodeModule* modp) -> void {
+    const auto setAll = [](AstNodeModule* modp) -> void {
         for (AstNode* nodep = VN_CAST(modp, NodeModule)->stmtsp(); nodep; nodep = nodep->nextp()) {
             if (VN_IS(nodep, CFunc) || VN_IS(nodep, Var)) nodep->user4p(modp);
         }
diff --git a/src/V3EmitCMain.cpp b/src/V3EmitCMain.cpp
index a7260fb8f..493aca407 100644
--- a/src/V3EmitCMain.cpp
+++ b/src/V3EmitCMain.cpp
@@ -40,7 +40,7 @@ public:
 private:
     // MAIN METHOD
     void emitInt() {
-        string filename = v3Global.opt.makeDir() + "/" + topClassName() + "__main.cpp";
+        const string filename = v3Global.opt.makeDir() + "/" + topClassName() + "__main.cpp";
         newCFile(filename, false /*slow*/, true /*source*/);
         V3OutCFile cf(filename);
         m_ofp = &cf;
diff --git a/src/V3EmitCMake.cpp b/src/V3EmitCMake.cpp
index a2aa6bd78..82ea3c1f8 100644
--- a/src/V3EmitCMake.cpp
+++ b/src/V3EmitCMake.cpp
@@ -64,7 +64,7 @@ class CMakeEmitter final {
 
     static void cmake_set(std::ofstream& of, const string& name, const string& value,
                           const string& cache_type = "", const string& docstring = "") {
-        string raw_value = "\"" + value + "\"";
+        const string raw_value = "\"" + value + "\"";
         cmake_set_raw(of, name, raw_value, cache_type, docstring);
     }
 
@@ -80,7 +80,7 @@ class CMakeEmitter final {
     static void emitOverallCMake() {
         const std::unique_ptr<std::ofstream> of(
             V3File::new_ofstream(v3Global.opt.makeDir() + "/" + v3Global.opt.prefix() + ".cmake"));
-        string name = v3Global.opt.prefix();
+        const string name = v3Global.opt.prefix();
 
         *of << "# Verilated -*- CMake -*-\n";
         *of << "# DESCR"
diff --git a/src/V3EmitCSyms.cpp b/src/V3EmitCSyms.cpp
index ccd80af56..1a4bbca13 100644
--- a/src/V3EmitCSyms.cpp
+++ b/src/V3EmitCSyms.cpp
@@ -125,7 +125,7 @@ class EmitCSyms final : EmitCBaseVisitor {
             && !(VN_IS(nodep, CFunc)
                  && (VN_CAST(nodep, CFunc)->isConstructor()
                      || VN_CAST(nodep, CFunc)->isDestructor()))) {
-            string rsvd = V3LanguageWords::isKeyword(nodep->name());
+            const string rsvd = V3LanguageWords::isKeyword(nodep->name());
             if (rsvd != "") {
                 // Generally V3Name should find all of these and throw SYMRSVDWORD.
                 // We'll still check here because the compiler errors
@@ -170,7 +170,7 @@ class EmitCSyms final : EmitCBaseVisitor {
             const auto scpit = m_vpiScopeCandidates.find(scp);
             if ((scpit != m_vpiScopeCandidates.end())
                 && (m_scopeNames.find(scp) == m_scopeNames.end())) {
-                auto scopeNameit = m_scopeNames.find(scpit->second.m_symName);
+                const auto scopeNameit = m_scopeNames.find(scpit->second.m_symName);
                 if (scopeNameit == m_scopeNames.end()) {
                     m_scopeNames.emplace(scpit->second.m_symName, scpit->second);
                 } else {
@@ -216,9 +216,9 @@ class EmitCSyms final : EmitCBaseVisitor {
                     }
                     // UINFO(9,"For "<<scopep->name()<<" - "<<varp->name()<<"  Scp "<<scpName<<"
                     // Var "<<varBase<<endl);
-                    string varBasePretty = AstNode::prettyName(varBase);
-                    string scpPretty = AstNode::prettyName(scpName);
-                    string scpSym = scopeSymString(scpName);
+                    const string varBasePretty = AstNode::prettyName(varBase);
+                    const string scpPretty = AstNode::prettyName(scpName);
+                    const string scpSym = scopeSymString(scpName);
                     // UINFO(9," scnameins sp "<<scpName<<" sp "<<scpPretty<<" ss "<<scpSym<<endl);
                     if (v3Global.opt.vpi()) varHierarchyScopes(scpName);
                     if (m_scopeNames.find(scpSym) == m_scopeNames.end()) {
@@ -238,7 +238,7 @@ class EmitCSyms final : EmitCBaseVisitor {
              ++it) {
             if (it->second.m_type != "SCOPE_MODULE") continue;
 
-            string symName = it->second.m_symName;
+            const string symName = it->second.m_symName;
             string above = symName;
             if (above.substr(0, 4) == "TOP.") above.replace(0, 4, "");
 
@@ -289,10 +289,11 @@ class EmitCSyms final : EmitCBaseVisitor {
     }
     virtual void visit(AstCellInline* nodep) override {
         if (v3Global.opt.vpi()) {
-            string type = (nodep->origModName() == "__BEGIN__") ? "SCOPE_OTHER" : "SCOPE_MODULE";
-            string name = nodep->scopep()->name() + "__DOT__" + nodep->name();
-            string name_dedot = AstNode::dedotName(name);
-            int timeunit = m_modp->timeunit().powerOfTen();
+            const string type
+                = (nodep->origModName() == "__BEGIN__") ? "SCOPE_OTHER" : "SCOPE_MODULE";
+            const string name = nodep->scopep()->name() + "__DOT__" + nodep->name();
+            const string name_dedot = AstNode::dedotName(name);
+            const int timeunit = m_modp->timeunit().powerOfTen();
             m_vpiScopeCandidates.insert(
                 std::make_pair(name, ScopeData(scopeSymString(name), name_dedot, timeunit, type)));
         }
@@ -304,19 +305,19 @@ class EmitCSyms final : EmitCBaseVisitor {
         m_scopes.emplace_back(std::make_pair(nodep, m_modp));
 
         if (v3Global.opt.vpi() && !nodep->isTop()) {
-            string type = VN_IS(nodep->modp(), Package) ? "SCOPE_OTHER" : "SCOPE_MODULE";
-            string name_dedot = AstNode::dedotName(nodep->shortName());
-            int timeunit = m_modp->timeunit().powerOfTen();
+            const string type = VN_IS(nodep->modp(), Package) ? "SCOPE_OTHER" : "SCOPE_MODULE";
+            const string name_dedot = AstNode::dedotName(nodep->shortName());
+            const int timeunit = m_modp->timeunit().powerOfTen();
             m_vpiScopeCandidates.insert(
                 std::make_pair(nodep->name(), ScopeData(scopeSymString(nodep->name()), name_dedot,
                                                         timeunit, type)));
         }
     }
     virtual void visit(AstScopeName* nodep) override {
-        string name = nodep->scopeSymName();
+        const string name = nodep->scopeSymName();
         // UINFO(9,"scnameins sp "<<nodep->name()<<" sp "<<nodep->scopePrettySymName()
         // <<" ss"<<name<<endl);
-        int timeunit = m_modp ? m_modp->timeunit().powerOfTen() : 0;
+        const int timeunit = m_modp ? m_modp->timeunit().powerOfTen() : 0;
         if (m_scopeNames.find(name) == m_scopeNames.end()) {
             m_scopeNames.emplace(
                 name, ScopeData(name, nodep->scopePrettySymName(), timeunit, "SCOPE_OTHER"));
@@ -369,7 +370,7 @@ public:
 
 void EmitCSyms::emitSymHdr() {
     UINFO(6, __FUNCTION__ << ": " << endl);
-    string filename = v3Global.opt.makeDir() + "/" + symClassName() + ".h";
+    const string filename = v3Global.opt.makeDir() + "/" + symClassName() + ".h";
     newCFile(filename, true /*slow*/, false /*source*/);
 
     if (v3Global.opt.systemC()) {
@@ -408,7 +409,8 @@ void EmitCSyms::emitSymHdr() {
         for (const auto& itr : m_scopeFuncs) {
             AstCFunc* funcp = itr.second.m_cfuncp;
             if (funcp->dpiExportImpl()) {
-                string cbtype = protect(v3Global.opt.prefix() + "__Vcb_" + funcp->cname() + "_t");
+                const string cbtype
+                    = protect(v3Global.opt.prefix() + "__Vcb_" + funcp->cname() + "_t");
                 types["using " + cbtype + " = void (*) (" + cFuncArgs(funcp) + ");\n"] = 1;
             }
         }
@@ -575,12 +577,12 @@ void EmitCSyms::emitSymImpPreamble() {
 
 void EmitCSyms::emitScopeHier(bool destroy) {
     if (v3Global.opt.vpi()) {
-        string verb = destroy ? "Tear down" : "Set up";
-        string method = destroy ? "remove" : "add";
+        const string verb = destroy ? "Tear down" : "Set up";
+        const string method = destroy ? "remove" : "add";
         puts("\n// " + verb + " scope hierarchy\n");
         for (ScopeNames::const_iterator it = m_scopeNames.begin(); it != m_scopeNames.end();
              ++it) {
-            string name = it->second.m_prettyName;
+            const string name = it->second.m_prettyName;
             if (it->first == "TOP") continue;
             if ((name.find('.') == string::npos) && (it->second.m_type == "SCOPE_MODULE")) {
                 puts("__Vhier." + method + "(0, &" + protect("__Vscope_" + it->second.m_symName)
@@ -591,8 +593,8 @@ void EmitCSyms::emitScopeHier(bool destroy) {
         for (auto it = m_vpiScopeHierarchy.cbegin(); it != m_vpiScopeHierarchy.cend(); ++it) {
             for (ScopeNameList::const_iterator lit = it->second.begin(); lit != it->second.end();
                  ++lit) {
-                string fromname = scopeSymString(it->first);
-                string toname = scopeSymString(*lit);
+                const string fromname = scopeSymString(it->first);
+                const string toname = scopeSymString(*lit);
                 const auto from = vlstd::as_const(m_scopeNames).find(fromname);
                 const auto to = vlstd::as_const(m_scopeNames).find(toname);
                 UASSERT(from != m_scopeNames.end(), fromname + " not in m_scopeNames");
@@ -608,7 +610,7 @@ void EmitCSyms::emitScopeHier(bool destroy) {
 
 void EmitCSyms::emitSymImp() {
     UINFO(6, __FUNCTION__ << ": " << endl);
-    string filename = v3Global.opt.makeDir() + "/" + symClassName() + ".cpp";
+    const string filename = v3Global.opt.makeDir() + "/" + symClassName() + ".cpp";
     AstCFile* cfilep = newCFile(filename, true /*slow*/, true /*source*/);
     cfilep->support(true);
 
@@ -623,9 +625,9 @@ void EmitCSyms::emitSymImp() {
 
     if (v3Global.opt.savable()) {
         for (int de = 0; de < 2; ++de) {
-            string classname = de ? "VerilatedDeserialize" : "VerilatedSerialize";
-            string funcname = de ? "__Vdeserialize" : "__Vserialize";
-            string op = de ? ">>" : "<<";
+            const string classname = de ? "VerilatedDeserialize" : "VerilatedSerialize";
+            const string funcname = de ? "__Vdeserialize" : "__Vserialize";
+            const string op = de ? ">>" : "<<";
             // NOLINTNEXTLINE(performance-inefficient-string-concatenation)
             puts("void " + symClassName() + "::" + protect(funcname) + "(" + classname
                  + "& os) {\n");
@@ -724,7 +726,7 @@ void EmitCSyms::emitSymImp() {
         if (!modp->isTop()) {
             checkSplit(false);
             // first is used by AstCoverDecl's call to __vlCoverInsert
-            bool first = !modp->user1();
+            const bool first = !modp->user1();
             modp->user1(true);
             puts(protectIf(scopep->nameDotless(), scopep->protect()) + "."
                  + protect("__Vconfigure") + "(this, " + (first ? "true" : "false") + ");\n");
@@ -878,7 +880,7 @@ void EmitCSyms::emitSymImp() {
 
 void EmitCSyms::emitDpiHdr() {
     UINFO(6, __FUNCTION__ << ": " << endl);
-    string filename = v3Global.opt.makeDir() + "/" + topClassName() + "__Dpi.h";
+    const string filename = v3Global.opt.makeDir() + "/" + topClassName() + "__Dpi.h";
     AstCFile* cfilep = newCFile(filename, false /*slow*/, false /*source*/);
     cfilep->support(true);
     V3OutCFile hf(filename);
@@ -927,7 +929,7 @@ void EmitCSyms::emitDpiHdr() {
 
 void EmitCSyms::emitDpiImp() {
     UINFO(6, __FUNCTION__ << ": " << endl);
-    string filename = v3Global.opt.makeDir() + "/" + topClassName() + "__Dpi.cpp";
+    const string filename = v3Global.opt.makeDir() + "/" + topClassName() + "__Dpi.cpp";
     AstCFile* cfilep = newCFile(filename, false /*slow*/, true /*source*/);
     cfilep->support(true);
     V3OutCFile hf(filename);
diff --git a/src/V3EmitMk.cpp b/src/V3EmitMk.cpp
index dc8b932c7..dda111668 100644
--- a/src/V3EmitMk.cpp
+++ b/src/V3EmitMk.cpp
@@ -203,7 +203,7 @@ public:
         const V3StringSet& cppFiles = v3Global.opt.cppFiles();
         for (const auto& cppfile : cppFiles) {
             of.puts("\t" + V3Os::filenameNonExt(cppfile) + " \\\n");
-            string dir = V3Os::filenameDir(cppfile);
+            const string dir = V3Os::filenameDir(cppfile);
             dirs.insert(dir);
         }
         of.puts("\n");
@@ -228,7 +228,7 @@ public:
             of.puts("VPATH += $(VM_USER_DIR)\n");
             of.puts("\n");
             for (const string& cppfile : cppFiles) {
-                string basename = V3Os::filenameNonExt(cppfile);
+                const string basename = V3Os::filenameNonExt(cppfile);
                 // NOLINTNEXTLINE(performance-inefficient-string-concatenation)
                 of.puts(basename + ".o: " + cppfile + "\n");
                 of.puts("\t$(OBJCACHE) $(CXX) $(CXXFLAGS) $(CPPFLAGS) $(OPT_FAST) -c -o $@ $<\n");
diff --git a/src/V3EmitV.cpp b/src/V3EmitV.cpp
index 648e7510c..aad3f2348 100644
--- a/src/V3EmitV.cpp
+++ b/src/V3EmitV.cpp
@@ -850,7 +850,8 @@ void V3EmitV::emitvFiles() {
 
 void V3EmitV::debugEmitV(const string& stage) {
     UINFO(2, __FUNCTION__ << ": " << endl);
-    string filename = v3Global.opt.makeDir() + "/" + v3Global.opt.prefix() + "__" + stage + ".v";
+    const string filename
+        = v3Global.opt.makeDir() + "/" + v3Global.opt.prefix() + "__" + stage + ".v";
     V3OutVFile of(filename);
     EmitVFileVisitor visitor(v3Global.rootp(), &of, true, true);
 }
diff --git a/src/V3EmitXml.cpp b/src/V3EmitXml.cpp
index ebe61b2e2..e231a3d43 100644
--- a/src/V3EmitXml.cpp
+++ b/src/V3EmitXml.cpp
@@ -129,9 +129,9 @@ class EmitXmlFileVisitor final : public AstNVisitor {
         outputChildrenEnd(nodep, "");
     }
     virtual void visit(AstVar* nodep) override {
-        AstVarType typ = nodep->varType();
-        string kw = nodep->verilogKwd();
-        string vt = nodep->dtypep()->name();
+        const AstVarType typ = nodep->varType();
+        const string kw = nodep->verilogKwd();
+        const string vt = nodep->dtypep()->name();
         outputTag(nodep, "");
         if (nodep->isIO()) {
             puts(" dir=");
@@ -183,7 +183,7 @@ class EmitXmlFileVisitor final : public AstNVisitor {
     }
     virtual void visit(AstModportVarRef* nodep) override {
         // Dump direction for Modport references
-        string kw = nodep->direction().xmlKwd();
+        const string kw = nodep->direction().xmlKwd();
         outputTag(nodep, "");
         puts(" direction=");
         putsQuoted(kw);
@@ -376,9 +376,9 @@ public:
 void V3EmitXml::emitxml() {
     UINFO(2, __FUNCTION__ << ": " << endl);
     // All-in-one file
-    string filename = (v3Global.opt.xmlOutput().empty()
-                           ? v3Global.opt.makeDir() + "/" + v3Global.opt.prefix() + ".xml"
-                           : v3Global.opt.xmlOutput());
+    const string filename = (v3Global.opt.xmlOutput().empty()
+                                 ? v3Global.opt.makeDir() + "/" + v3Global.opt.prefix() + ".xml"
+                                 : v3Global.opt.xmlOutput());
     V3OutXmlFile of(filename);
     of.putsHeader();
     of.puts("<!-- DESCR"
diff --git a/src/V3Error.cpp b/src/V3Error.cpp
index d1f4b4a4f..602b56eaf 100644
--- a/src/V3Error.cpp
+++ b/src/V3Error.cpp
@@ -97,7 +97,7 @@ void V3Error::incErrors() {
 }
 
 void V3Error::abortIfWarnings() {
-    bool exwarn = warnFatal() && warnCount();
+    const bool exwarn = warnFatal() && warnCount();
     if (errorCount() && exwarn) {
         v3fatalExit("Exiting due to " << std::dec << errorCount() << " error(s), "  //
                                       << warnCount() << " warning(s)\n");
@@ -132,7 +132,7 @@ bool V3Error::isError(V3ErrorCode code, bool supp) {
 
 string V3Error::msgPrefix() {
     V3ErrorCode code = s_errorCode;
-    bool supp = s_errorSuppressed;
+    const bool supp = s_errorSuppressed;
     if (supp) {
         return "-arning-suppressed: ";
     } else if (code == V3ErrorCode::USERINFO) {
@@ -210,8 +210,8 @@ void V3Error::v3errorEnd(std::ostringstream& sstr, const string& locationStr) {
     if (s_messages.find(msg) != s_messages.end()) return;
     s_messages.insert(msg);
     if (!locationStr.empty()) {
-        string locationMsg = warnMore() + locationStr + "\n";
-        size_t pos = msg.find('\n');
+        const string locationMsg = warnMore() + locationStr + "\n";
+        const size_t pos = msg.find('\n');
         msg.insert(pos + 1, locationMsg);
     }
     // Output
diff --git a/src/V3Expand.cpp b/src/V3Expand.cpp
index 2f33136f7..ca6353204 100644
--- a/src/V3Expand.cpp
+++ b/src/V3Expand.cpp
@@ -149,11 +149,11 @@ private:
         AstNode* newp;
         // Negative word numbers requested for lhs when it's "before" what we want.
         // We get a 0 then.
-        int othword = word - shift / VL_EDATASIZE;
+        const int othword = word - shift / VL_EDATASIZE;
         AstNode* llowp = newAstWordSelClone(lhsp, othword);
-        if (int loffset = VL_BITBIT_E(shift)) {
+        if (const int loffset = VL_BITBIT_E(shift)) {
             AstNode* lhip = newAstWordSelClone(lhsp, othword - 1);
-            int nbitsonright = VL_EDATASIZE - loffset;  // bits that end up in lword
+            const int nbitsonright = VL_EDATASIZE - loffset;  // bits that end up in lword
             newp = new AstOr(
                 fl,
                 new AstAnd(fl, new AstConst(fl, AstConst::SizedEData(), VL_MASK_E(loffset)),
@@ -448,7 +448,7 @@ private:
         UASSERT_OBJ(nodep->widthMin() == rhsp->widthConst(), nodep, "Width mismatch");
         if (!doExpand(nodep)) return false;
         if (VN_IS(rhsp->lsbp(), Const) && VL_BITBIT_E(rhsp->lsbConst()) == 0) {
-            int lsb = rhsp->lsbConst();
+            const int lsb = rhsp->lsbConst();
             UINFO(8, "    Wordize ASSIGN(SEL,align) " << nodep << endl);
             for (int w = 0; w < nodep->widthWords(); w++) {
                 addWordAssign(nodep, w, newAstWordSelClone(rhsp->fromp(), w + VL_BITWORD_E(lsb)));
@@ -491,15 +491,15 @@ private:
         //      rhsp:  may be allones and can remove AND NOT gate
         //      lsbp:  constant or variable
         // Yuk.
-        bool destwide = lhsp->fromp()->isWide();
-        bool ones = nodep->rhsp()->isAllOnesV();
+        const bool destwide = lhsp->fromp()->isWide();
+        const bool ones = nodep->rhsp()->isAllOnesV();
         if (VN_IS(lhsp->lsbp(), Const)) {
             // The code should work without this constant test, but it won't
             // constify as nicely as we'd like.
             AstNode* rhsp = nodep->rhsp()->unlinkFrBack();
             AstNode* destp = lhsp->fromp()->unlinkFrBack();
-            int lsb = lhsp->lsbConst();
-            int msb = lhsp->msbConst();
+            const int lsb = lhsp->lsbConst();
+            const int msb = lhsp->msbConst();
             V3Number maskset(nodep, destp->widthMin());
             for (int bit = lsb; bit < (msb + 1); bit++) maskset.setBit(bit, 1);
             V3Number maskold(nodep, destp->widthMin());
@@ -659,7 +659,7 @@ private:
             UINFO(8, "    CONCAT " << nodep << endl);
             AstNode* lhsp = nodep->lhsp()->unlinkFrBack();
             AstNode* rhsp = nodep->rhsp()->unlinkFrBack();
-            int rhsshift = rhsp->widthMin();
+            const int rhsshift = rhsp->widthMin();
             if (nodep->isQuad() && !lhsp->isQuad()) {
                 lhsp = new AstCCast(nodep->fileline(), lhsp, nodep);
             }
@@ -680,7 +680,7 @@ private:
         if (!doExpand(rhsp)) return false;
         // Lhs or Rhs may be word, long, or quad.
         // newAstWordSelClone nicely abstracts the difference.
-        int rhsshift = rhsp->rhsp()->widthMin();
+        const int rhsshift = rhsp->rhsp()->widthMin();
         // Sometimes doing the words backwards is preferable.
         // When we have x={x,foo} backwards is better, when x={foo,x} forward is better
         // However V3Subst tends to rip this up, so not worth optimizing now.
@@ -701,7 +701,7 @@ private:
         } else {
             AstNode* lhsp = nodep->lhsp()->unlinkFrBack();
             AstNode* newp;
-            int lhswidth = lhsp->widthMin();
+            const int lhswidth = lhsp->widthMin();
             if (lhswidth == 1) {
                 UINFO(8, "    REPLICATE(w1) " << nodep << endl);
                 newp = new AstNegate(nodep->fileline(), lhsp);
@@ -716,7 +716,7 @@ private:
                 }
                 newp = lhsp->cloneTree(true);
                 for (unsigned repnum = 1; repnum < times; repnum++) {
-                    int rhsshift = repnum * lhswidth;
+                    const int rhsshift = repnum * lhswidth;
                     newp = new AstOr(nodep->fileline(),
                                      new AstShiftL(nodep->fileline(), lhsp->cloneTree(true),
                                                    new AstConst(nodep->fileline(), rhsshift),
@@ -734,7 +734,7 @@ private:
         UINFO(8, "    Wordize ASSIGN(REPLICATE) " << nodep << endl);
         if (!doExpand(rhsp)) return false;
         AstNode* lhsp = rhsp->lhsp();
-        int lhswidth = lhsp->widthMin();
+        const int lhswidth = lhsp->widthMin();
         const AstConst* constp = VN_CAST(rhsp->rhsp(), Const);
         UASSERT_OBJ(constp, rhsp, "Replication value isn't a constant.  Checked earlier!");
         uint32_t times = constp->toUInt();
diff --git a/src/V3File.cpp b/src/V3File.cpp
index 2fcda4831..89bf07940 100644
--- a/src/V3File.cpp
+++ b/src/V3File.cpp
@@ -89,8 +89,8 @@ class V3FileDependImp final {
         time_t mnstime() const { return VL_STAT_MTIME_NSEC(m_stat); }  // Nanoseconds
         void loadStats() {
             if (!m_stat.st_mtime) {
-                string fn = filename();
-                int err = stat(fn.c_str(), &m_stat);
+                const string fn = filename();
+                const int err = stat(fn.c_str(), &m_stat);
                 if (err != 0) {
                     memset(&m_stat, 0, sizeof(m_stat));
                     m_stat.st_mtime = 1;
@@ -181,7 +181,7 @@ inline void V3FileDependImp::writeTimes(const string& filename, const string& cm
     const std::unique_ptr<std::ofstream> ofp(V3File::new_ofstream(filename));
     if (ofp->fail()) v3fatal("Can't write " << filename);
 
-    string cmdline = stripQuotes(cmdlineIn);
+    const string cmdline = stripQuotes(cmdlineIn);
     *ofp << "# DESCR"
          << "IPTION: Verilator output: Timestamp data for --skip-identical.  Delete at will.\n";
     *ofp << "C \"" << cmdline << "\"\n";
@@ -219,7 +219,7 @@ inline bool V3FileDependImp::checkTimes(const string& filename, const string& cm
         return false;
     }
     {
-        string ignore = V3Os::getline(*ifp);
+        const string ignore = V3Os::getline(*ifp);
         if (ignore.empty()) { /*used*/
         }
     }
@@ -228,8 +228,8 @@ inline bool V3FileDependImp::checkTimes(const string& filename, const string& cm
         *ifp >> chkDir;
         char quote;
         *ifp >> quote;
-        string chkCmdline = V3Os::getline(*ifp, '"');
-        string cmdline = stripQuotes(cmdlineIn);
+        const string chkCmdline = V3Os::getline(*ifp, '"');
+        const string cmdline = stripQuotes(cmdlineIn);
         if (cmdline != chkCmdline) {
             UINFO(2, "   --check-times failed: different command line\n");
             return false;
@@ -254,12 +254,12 @@ inline bool V3FileDependImp::checkTimes(const string& filename, const string& cm
         *ifp >> chkMnstime;
         char quote;
         *ifp >> quote;
-        string chkFilename = V3Os::getline(*ifp, '"');
+        const string chkFilename = V3Os::getline(*ifp, '"');
 
         V3Options::fileNfsFlush(chkFilename);
         // NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
         struct stat chkStat;
-        int err = stat(chkFilename.c_str(), &chkStat);
+        const int err = stat(chkFilename.c_str(), &chkStat);
         if (err != 0) {
             UINFO(2, "   --check-times failed: missing " << chkFilename << endl);
             return false;
@@ -354,7 +354,7 @@ private:
         }
     }
     bool readContentsFile(const string& filename, StrList& outl) {
-        int fd = open(filename.c_str(), O_RDONLY);
+        const int fd = open(filename.c_str(), O_RDONLY);
         if (fd < 0) return false;
         m_readEof = false;
         readBlocks(fd, -1, outl);
@@ -365,7 +365,7 @@ private:
         if (filename != "" || outl.empty()) {}  // Prevent unused
 #ifdef INFILTER_PIPE
         writeFilter("read \"" + filename + "\"\n");
-        string line = readFilterLine();
+        const string line = readFilterLine();
         if (line.find("Content-Length") != string::npos) {
             int len = 0;
             sscanf(line.c_str(), "Content-Length: %d\n", &len);
@@ -402,7 +402,7 @@ private:
             ssize_t todo = INFILTER_IPC_BUFSIZ;
             if (size > 0 && size < todo) todo = size;
             errno = 0;
-            ssize_t got = read(fd, buf, todo);
+            const ssize_t got = read(fd, buf, todo);
             // UINFO(9,"RD GOT g "<< got<<" e "<<errno<<" "<<strerror(errno)<<endl);
             // usleep(50*1000);
             if (got > 0) {
@@ -431,7 +431,7 @@ private:
         while (!m_readEof) {
             StrList outl;
             readBlocks(m_readFd, 1, outl);
-            string onechar = listString(outl);
+            const string onechar = listString(outl);
             line += onechar;
             if (onechar == "\n") {
                 if (line == "\n") {
@@ -459,7 +459,7 @@ private:
         unsigned offset = 0;
         while (!m_readEof && out.length() > offset) {
             errno = 0;
-            int got = write(m_writeFd, (out.c_str()) + offset, out.length() - offset);
+            const int got = write(m_writeFd, (out.c_str()) + offset, out.length() - offset);
             // UINFO(9,"WR GOT g "<< got<<" e "<<errno<<" "<<strerror(errno)<<endl);
             // usleep(50*1000);
             if (got > 0) {
@@ -506,7 +506,7 @@ private:
 
         UINFO(1, "--pipe-filter: /bin/sh -c " << command << endl);
 
-        pid_t pid = fork();
+        const pid_t pid = fork();
         if (pid < 0) v3fatal("--pipe-filter: fork failed: " << strerror(errno));
         if (pid == 0) {  // Child
             UINFO(6, "In child\n");
@@ -827,7 +827,7 @@ void V3OutFormatter::putsQuoted(const string& strg) {
     // Quote \ and " for use inside C programs
     // Don't use to quote a filename for #include - #include doesn't \ escape.
     putcNoTracking('"');
-    string quoted = quoteNameControls(strg);
+    const string quoted = quoteNameControls(strg);
     for (const char c : quoted) putcNoTracking(c);
     putcNoTracking('"');
 }
@@ -894,8 +894,8 @@ string V3OutFormatter::quoteNameControls(const string& namein, V3OutFormatter::L
                 out += c;
             } else {
                 // This will also cover \a etc
-                string octal = string("\\") + cvtToStr((c >> 6) & 3) + cvtToStr((c >> 3) & 7)
-                               + cvtToStr(c & 7);
+                const string octal = string("\\") + cvtToStr((c >> 6) & 3) + cvtToStr((c >> 3) & 7)
+                                     + cvtToStr(c & 7);
                 out += octal;
             }
         }
@@ -1003,7 +1003,7 @@ public:
                 out = "PS" + digest.digestSymbol();
                 // See if we can shrink the digest symbol to something smaller
                 for (size_t len = 6; len < out.size() - 3; len += 3) {
-                    string tryout = out.substr(0, len);
+                    const string tryout = out.substr(0, len);
                     if (m_newIdSet.find(tryout) == m_newIdSet.end()) {
                         out = tryout;
                         break;
diff --git a/src/V3FileLine.cpp b/src/V3FileLine.cpp
index 5c5449ed2..bca5846cc 100644
--- a/src/V3FileLine.cpp
+++ b/src/V3FileLine.cpp
@@ -60,7 +60,7 @@ string FileLineSingleton::filenameLetters(int fileno) {
 int FileLineSingleton::nameToNumber(const string& filename) {
     const auto it = vlstd::as_const(m_namemap).find(filename);
     if (VL_LIKELY(it != m_namemap.end())) return it->second;
-    int num = m_names.size();
+    const int num = m_names.size();
     m_names.push_back(filename);
     m_languages.push_back(V3LangCode::mostRecent());
     m_namemap.emplace(filename, num);
@@ -95,7 +95,7 @@ void VFileContent::pushText(const string& text) {
     }
 
     // Any leftover text is stored on largest line (might be "")
-    string leftover = m_lines.back() + text;
+    const string leftover = m_lines.back() + text;
     m_lines.pop_back();
 
     // Insert line-by-line
@@ -125,7 +125,7 @@ string VFileContent::getLine(int lineno) const {
             return "";
         }
     }
-    string text = m_lines[lineno];
+    const string text = m_lines[lineno];
     UINFO(9, "Get Stream[ct" << m_id << "+" << lineno << "]: " << text);
     return text;
 }
@@ -399,7 +399,7 @@ string FileLine::warnContext(bool secondary) const {
     if (!v3Global.opt.context()) return "";
     string out;
     if (firstLineno() == lastLineno() && firstColumn()) {
-        string sourceLine = prettySource();
+        const string sourceLine = prettySource();
         // Don't show super-long lines as can fill screen and unlikely to help user
         if (!sourceLine.empty() && sourceLine.length() < SHOW_SOURCE_MAX_LENGTH
             && sourceLine.length() >= static_cast<size_t>(lastColumn() - 1)) {
diff --git a/src/V3Gate.cpp b/src/V3Gate.cpp
index f9144db8d..867248bb3 100644
--- a/src/V3Gate.cpp
+++ b/src/V3Gate.cpp
@@ -571,7 +571,7 @@ void GateVisitor::optimizeSignals(bool allowMultiIn) {
                 if (logicVertexp->reducible()) {
                     // Can we eliminate?
                     GateOkVisitor okVisitor(logicp, vvertexp->isClock(), false);
-                    bool multiInputs = okVisitor.rhsVarRefs().size() > 1;
+                    const bool multiInputs = okVisitor.rhsVarRefs().size() > 1;
                     // Was it ok?
                     bool doit = okVisitor.isSimple();
                     if (doit && multiInputs) {
diff --git a/src/V3Graph.cpp b/src/V3Graph.cpp
index 2f6481943..f292f478f 100644
--- a/src/V3Graph.cpp
+++ b/src/V3Graph.cpp
@@ -114,7 +114,7 @@ V3GraphEdge* V3GraphVertex::findConnectingEdgep(GraphWay way, const V3GraphVerte
     // O(edges) linear search. Searches search both nodes' edge lists in
     // parallel.  The lists probably aren't _both_ huge, so this is
     // unlikely to blow up even on fairly nasty graphs.
-    GraphWay inv = way.invert();
+    const GraphWay inv = way.invert();
     V3GraphEdge* aedgep = this->beginp(way);
     V3GraphEdge* bedgep = waywardp->beginp(inv);
     while (aedgep && bedgep) {
@@ -340,7 +340,7 @@ void V3Graph::dumpDotFile(const string& filename, bool colorAsSubgraph) const {
     int n = 0;
     string subgr;
     for (auto it = subgraphs.cbegin(); it != subgraphs.cend(); ++it) {
-        string vertexSubgraph = it->first;
+        const string vertexSubgraph = it->first;
         V3GraphVertex* vertexp = it->second;
         numMap[vertexp] = n;
         if (subgr != vertexSubgraph) {
@@ -366,8 +366,8 @@ void V3Graph::dumpDotFile(const string& filename, bool colorAsSubgraph) const {
     for (V3GraphVertex* vertexp = verticesBeginp(); vertexp; vertexp = vertexp->verticesNextp()) {
         for (V3GraphEdge* edgep = vertexp->outBeginp(); edgep; edgep = edgep->outNextp()) {
             if (edgep->weight()) {
-                int fromVnum = numMap[edgep->fromp()];
-                int toVnum = numMap[edgep->top()];
+                const int fromVnum = numMap[edgep->fromp()];
+                const int toVnum = numMap[edgep->top()];
                 *logp << "\tn" << edgep->fromp()->dotName() << fromVnum << " -> n"
                       << edgep->top()->dotName() << toVnum
                       << " ["
diff --git a/src/V3GraphDfa.cpp b/src/V3GraphDfa.cpp
index a619c23d9..16cc3c066 100644
--- a/src/V3GraphDfa.cpp
+++ b/src/V3GraphDfa.cpp
@@ -318,7 +318,7 @@ private:
 
             // Foreach input state (NFA inputs of this DFA state)
             for (int inIt : inputs) {
-                DfaInput input = inIt;
+                const DfaInput input = inIt;
                 UINFO(9, "    ===" << ++i << "=======================\n");
                 UINFO(9, "    On input " << cvtToHex(input.toNodep()) << endl);
 
diff --git a/src/V3GraphPathChecker.cpp b/src/V3GraphPathChecker.cpp
index ae7a474dd..9f6013ace 100644
--- a/src/V3GraphPathChecker.cpp
+++ b/src/V3GraphPathChecker.cpp
@@ -73,7 +73,7 @@ GraphPathChecker::~GraphPathChecker() {
 
 void GraphPathChecker::initHalfCriticalPaths(GraphWay way, bool checkOnly) {
     GraphStreamUnordered order(m_graphp, way);
-    GraphWay rev = way.invert();
+    const GraphWay rev = way.invert();
     while (const V3GraphVertex* vertexp = order.nextp()) {
         unsigned critPathCost = 0;
         for (V3GraphEdge* edgep = vertexp->beginp(rev); edgep; edgep = edgep->nextp(rev)) {
diff --git a/src/V3HierBlock.cpp b/src/V3HierBlock.cpp
index afa858503..a11323d8e 100644
--- a/src/V3HierBlock.cpp
+++ b/src/V3HierBlock.cpp
@@ -309,7 +309,7 @@ bool V3HierBlockPlan::isHierBlock(const AstNodeModule* modp) const {
 }
 
 void V3HierBlockPlan::add(const AstNodeModule* modp, const std::vector<AstVar*>& gparams) {
-    iterator it = m_blocks.find(modp);
+    const iterator it = m_blocks.find(modp);
     if (it == m_blocks.end()) {
         V3HierBlock* hblockp = new V3HierBlock(modp, gparams);
         UINFO(3, "Add " << modp->prettyNameQ() << " with " << gparams.size() << " parameters"
@@ -319,9 +319,9 @@ void V3HierBlockPlan::add(const AstNodeModule* modp, const std::vector<AstVar*>&
 }
 
 void V3HierBlockPlan::registerUsage(const AstNodeModule* parentp, const AstNodeModule* childp) {
-    iterator parent = m_blocks.find(parentp);
+    const iterator parent = m_blocks.find(parentp);
     UASSERT_OBJ(parent != m_blocks.end(), parentp, "must be added");
-    iterator child = m_blocks.find(childp);
+    const iterator child = m_blocks.find(childp);
     if (child != m_blocks.end()) {
         UINFO(3, "Found usage relation " << parentp->prettyNameQ() << " uses "
                                          << childp->prettyNameQ() << std::endl);
diff --git a/src/V3Inline.cpp b/src/V3Inline.cpp
index 73a1c0332..01b62ae81 100644
--- a/src/V3Inline.cpp
+++ b/src/V3Inline.cpp
@@ -165,7 +165,7 @@ private:
     virtual void visit(AstNodeAssign* nodep) override {
         // Don't count assignments, as they'll likely flatten out
         // Still need to iterate though to nullify VarXRefs
-        int oldcnt = m_modp->user4();
+        const int oldcnt = m_modp->user4();
         iterateChildren(nodep);
         m_modp->user4(oldcnt);
     }
@@ -191,8 +191,8 @@ private:
             }
             modp->user4(statements);
 
-            int allowed = modp->user2();
-            int refs = modp->user3();
+            const int allowed = modp->user2();
+            const int refs = modp->user3();
 
             // Should we automatically inline this module?
             // If --flatten is specified, then force everything to be inlined that can be.
@@ -282,7 +282,7 @@ private:
         nodep->unlinkFrBack();
         m_modp->addInlinesp(nodep);
         // Rename
-        string name = m_cellp->name() + "__DOT__" + nodep->name();
+        const string name = m_cellp->name() + "__DOT__" + nodep->name();
         nodep->name(name);
         UINFO(6, "    Inline " << nodep << endl);
         // Do CellInlines under this, but don't move them
@@ -290,12 +290,12 @@ private:
     }
     virtual void visit(AstCell* nodep) override {
         // Cell under the inline cell, need to rename to avoid conflicts
-        string name = m_cellp->name() + "__DOT__" + nodep->name();
+        const string name = m_cellp->name() + "__DOT__" + nodep->name();
         nodep->name(name);
         iterateChildren(nodep);
     }
     virtual void visit(AstClass* nodep) override {
-        string name = m_cellp->name() + "__DOT__" + nodep->name();
+        const string name = m_cellp->name() + "__DOT__" + nodep->name();
         nodep->name(name);
         iterateChildren(nodep);
     }
@@ -376,7 +376,7 @@ private:
         }
         // Variable under the inline cell, need to rename to avoid conflicts
         // Also clear I/O bits, as it is now local.
-        string name = m_cellp->name() + "__DOT__" + nodep->name();
+        const string name = m_cellp->name() + "__DOT__" + nodep->name();
         if (!nodep->isFuncLocal() && !nodep->isClassMember()) nodep->inlineAttrReset(name);
         if (!m_cellp->isTrace()) nodep->trace(false);
         if (debug() >= 9) nodep->dumpTree(cout, "varchanged:");
@@ -415,7 +415,7 @@ private:
     }
     virtual void visit(AstVarXRef* nodep) override {
         // Track what scope it was originally under so V3LinkDot can resolve it
-        string newdots = VString::dot(m_cellp->name(), ".", nodep->inlinedDots());
+        const string newdots = VString::dot(m_cellp->name(), ".", nodep->inlinedDots());
         nodep->inlinedDots(newdots);
         for (string tryname = nodep->dotted(); true;) {
             if (m_renamedInterfaces.count(tryname)) {
@@ -434,7 +434,7 @@ private:
     }
     virtual void visit(AstNodeFTaskRef* nodep) override {
         // Track what scope it was originally under so V3LinkDot can resolve it
-        string newdots = VString::dot(m_cellp->name(), ".", nodep->inlinedDots());
+        const string newdots = VString::dot(m_cellp->name(), ".", nodep->inlinedDots());
         nodep->inlinedDots(newdots);
         if (m_renamedInterfaces.count(nodep->dotted())) {
             nodep->dotted(m_cellp->name() + "__DOT__" + nodep->dotted());
@@ -659,7 +659,7 @@ private:
                 AstCell* cellp;
                 if ((cellp = VN_CAST(fromVarp->user1p(), Cell)) || (cellp = irdtp->cellp())) {
                     varp->user1p(cellp);
-                    string alias = m_scope + "__DOT__" + pinp->name();
+                    const string alias = m_scope + "__DOT__" + pinp->name();
                     cellp->addIntfRefp(new AstIntfRef(pinp->fileline(), alias));
                 }
             }
diff --git a/src/V3Inst.cpp b/src/V3Inst.cpp
index bbc466e0e..ff4a2961c 100644
--- a/src/V3Inst.cpp
+++ b/src/V3Inst.cpp
@@ -207,7 +207,7 @@ private:
             AstUnpackArrayDType* arrdtype = VN_CAST(nodep->dtypep(), UnpackArrayDType);
             AstNode* prevp = nullptr;
             for (int i = arrdtype->lo(); i <= arrdtype->hi(); ++i) {
-                string varNewName = nodep->name() + "__BRA__" + cvtToStr(i) + "__KET__";
+                const string varNewName = nodep->name() + "__BRA__" + cvtToStr(i) + "__KET__";
                 UINFO(8, "VAR name insert " << varNewName << "  " << nodep << endl);
                 if (!m_deModVars.find(varNewName)) {
                     AstIfaceRefDType* ifaceRefp
@@ -246,15 +246,16 @@ private:
             m_cellRangep = nodep->rangep();
 
             AstVar* ifaceVarp = VN_CAST(nodep->nextp(), Var);
-            bool isIface = ifaceVarp && VN_IS(ifaceVarp->dtypep(), UnpackArrayDType)
-                           && VN_IS(VN_CAST(ifaceVarp->dtypep(), UnpackArrayDType)->subDTypep(),
-                                    IfaceRefDType);
+            const bool isIface
+                = ifaceVarp && VN_IS(ifaceVarp->dtypep(), UnpackArrayDType)
+                  && VN_IS(VN_CAST(ifaceVarp->dtypep(), UnpackArrayDType)->subDTypep(),
+                           IfaceRefDType);
 
             // Make all of the required clones
             for (int i = 0; i < m_cellRangep->elementsConst(); i++) {
                 m_instSelNum
                     = m_cellRangep->littleEndian() ? (m_cellRangep->elementsConst() - 1 - i) : i;
-                int instNum = m_cellRangep->loConst() + i;
+                const int instNum = m_cellRangep->loConst() + i;
 
                 AstCell* newp = nodep->cloneTree(false);
                 nodep->addNextHere(newp);
@@ -316,8 +317,8 @@ private:
         if (!nodep->exprp()) return;  // No-connect
         if (m_cellRangep) {
             UINFO(4, "   PIN  " << nodep << endl);
-            int pinwidth = nodep->modVarp()->width();
-            int expwidth = nodep->exprp()->width();
+            const int pinwidth = nodep->modVarp()->width();
+            const int expwidth = nodep->exprp()->width();
             std::pair<uint32_t, uint32_t> pinDim = nodep->modVarp()->dtypep()->dimensions(false);
             std::pair<uint32_t, uint32_t> expDim = nodep->exprp()->dtypep()->dimensions(false);
             UINFO(4, "   PINVAR  " << nodep->modVarp() << endl);
@@ -328,9 +329,9 @@ private:
             if (expDim.first == pinDim.first && expDim.second == pinDim.second + 1) {
                 // Connection to array, where array dimensions match the instant dimension
                 AstRange* rangep = VN_CAST(nodep->exprp()->dtypep(), UnpackArrayDType)->rangep();
-                int arraySelNum = rangep->littleEndian()
-                                      ? (rangep->elementsConst() - 1 - m_instSelNum)
-                                      : m_instSelNum;
+                const int arraySelNum = rangep->littleEndian()
+                                            ? (rangep->elementsConst() - 1 - m_instSelNum)
+                                            : m_instSelNum;
                 AstNode* exprp = nodep->exprp()->unlinkFrBack();
                 exprp = new AstArraySel(exprp->fileline(), exprp, arraySelNum);
                 nodep->exprp(exprp);
@@ -346,7 +347,7 @@ private:
                                                           << m_cellRangep->rightConst() << "]");
                 }
                 AstNode* exprp = nodep->exprp()->unlinkFrBack();
-                bool inputPin = nodep->modVarp()->isNonOutput();
+                const bool inputPin = nodep->modVarp()->isNonOutput();
                 if (!inputPin
                     && !VN_IS(exprp, VarRef)
                     // V3Const will collapse the SEL with the one we're about to make
@@ -373,7 +374,7 @@ private:
                         "Unsupported: Non-constant index when passing interface to module");
                     return;
                 }
-                string index = AstNode::encodeNumber(constp->toSInt());
+                const string index = AstNode::encodeNumber(constp->toSInt());
                 if (VN_IS(arrselp->lhsp(), SliceSel))
                     arrselp->lhsp()->v3error("Unsupported: interface slices");
                 AstVarRef* varrefp = VN_CAST(arrselp->lhsp(), VarRef);
@@ -397,7 +398,7 @@ private:
             // Clone pin varp:
             for (int in = 0; in < pinArrp->elementsConst(); ++in) {  // 0 = leftmost
                 int i = pinArrp->left() + in * pinArrp->declRange().leftToRightInc();
-                string varNewName = pinVarp->name() + "__BRA__" + cvtToStr(i) + "__KET__";
+                const string varNewName = pinVarp->name() + "__BRA__" + cvtToStr(i) + "__KET__";
                 AstVar* varNewp = nullptr;
 
                 // Only clone the var once for all usages of a given child module
@@ -445,7 +446,7 @@ private:
                     expr_i = exprArrp->left() + in * exprArrp->declRange().leftToRightInc();
                 }
 
-                string newname = varrefp->name() + "__BRA__" + cvtToStr(expr_i) + "__KET__";
+                const string newname = varrefp->name() + "__BRA__" + cvtToStr(expr_i) + "__KET__";
                 AstVarXRef* newVarXRefp
                     = new AstVarXRef(nodep->fileline(), newname, "", VAccess::WRITE);
                 newVarXRefp->varp(newp->modVarp());
diff --git a/src/V3Life.cpp b/src/V3Life.cpp
index 24c6866a6..c3dafa9f7 100644
--- a/src/V3Life.cpp
+++ b/src/V3Life.cpp
@@ -387,7 +387,7 @@ private:
         // Just don't optimize blocks with labels; they're rare - so far.
         LifeBlock* prevLifep = m_lifep;
         LifeBlock* bodyLifep = new LifeBlock(prevLifep, m_statep);
-        bool prev_noopt = m_noopt;
+        const bool prev_noopt = m_noopt;
         {
             m_lifep = bodyLifep;
             m_noopt = true;
diff --git a/src/V3LifePost.cpp b/src/V3LifePost.cpp
index c74ff31da..86bfe48b3 100644
--- a/src/V3LifePost.cpp
+++ b/src/V3LifePost.cpp
@@ -108,8 +108,8 @@ public:
         : mtaskp{mtaskp_}
         , sequence{sequence_} {}
     bool operator<(const LifeLocation& b) const {
-        unsigned a_id = mtaskp ? mtaskp->id() : 0;
-        unsigned b_id = b.mtaskp ? b.mtaskp->id() : 0;
+        const unsigned a_id = mtaskp ? mtaskp->id() : 0;
+        const unsigned b_id = b.mtaskp ? b.mtaskp->id() : 0;
         if (a_id < b_id) return true;
         if (b_id < a_id) return false;
         return sequence < b.sequence;
diff --git a/src/V3LinkCells.cpp b/src/V3LinkCells.cpp
index 2e6f5532b..ef6804da0 100644
--- a/src/V3LinkCells.cpp
+++ b/src/V3LinkCells.cpp
@@ -141,7 +141,7 @@ private:
             // Read-subfile
             // If file not found, make AstNotFoundModule, rather than error out.
             // We'll throw the error when we know the module will really be needed.
-            string prettyName = AstNode::prettyName(modName);
+            const string prettyName = AstNode::prettyName(modName);
             V3Parse parser(v3Global.rootp(), m_filterp, m_parseSymp);
             // true below -> other simulators treat modules in link-found files as library cells
             parser.parseFile(nodep->fileline(), prettyName, true, "");
@@ -217,7 +217,7 @@ private:
             if (VN_IS(nodep, Iface) || VN_IS(nodep, Package)) {
                 nodep->inLibrary(true);  // Interfaces can't be at top, unless asked
             }
-            bool topMatch = (v3Global.opt.topModule() == nodep->prettyName());
+            const bool topMatch = (v3Global.opt.topModule() == nodep->prettyName());
             if (topMatch) {
                 m_topVertexp = vertex(nodep);
                 UINFO(2, "Link --top-module: " << nodep << endl);
@@ -289,7 +289,7 @@ private:
         // Execute only once.  Complication is that cloning may result in
         // user1 being set (for pre-clone) so check if user1() matches the
         // m_mod, if 0 never did it, if !=, it is an unprocessed clone
-        bool cloned = (nodep->user1p() && nodep->user1p() != m_modp);
+        const bool cloned = (nodep->user1p() && nodep->user1p() != m_modp);
         if (nodep->user1p() == m_modp) return;  // AstBind and AstNodeModule may call a cell twice
         if (v3Global.opt.hierChild() && nodep->modName() == m_origTopModuleName) {
             if (nodep->modName() == m_modp->origName()) {
@@ -432,7 +432,8 @@ private:
             // classes are better supported may remap interfaces to be more
             // like a class.
             if (!nodep->hasIfaceVar()) {
-                string varName = nodep->name() + "__Viftop";  // V3LinkDot looks for this naming
+                const string varName
+                    = nodep->name() + "__Viftop";  // V3LinkDot looks for this naming
                 AstIfaceRefDType* idtypep = new AstIfaceRefDType(nodep->fileline(), nodep->name(),
                                                                  nodep->modp()->name());
                 idtypep->ifacep(nullptr);  // cellp overrides
diff --git a/src/V3LinkDot.cpp b/src/V3LinkDot.cpp
index 4fc0dff4a..d8b39c9eb 100644
--- a/src/V3LinkDot.cpp
+++ b/src/V3LinkDot.cpp
@@ -164,7 +164,7 @@ public:
     VL_DEBUG_FUNC;  // Declare debug()
     void dump(const string& nameComment = "linkdot", bool force = false) {
         if (debug() >= 6 || force) {
-            string filename = v3Global.debugFilename(nameComment) + ".txt";
+            const string filename = v3Global.debugFilename(nameComment) + ".txt";
             const std::unique_ptr<std::ofstream> logp(V3File::new_ofstream(filename));
             if (logp->fail()) v3fatal("Can't write " << filename);
             std::ostream& os = *logp;
@@ -476,8 +476,8 @@ public:
                     }
                 }
                 if (!ok) {
-                    string suggest = suggestSymFallback(ifaceSymp, ifacerefp->modportName(),
-                                                        LinkNodeMatcherModport());
+                    const string suggest = suggestSymFallback(ifaceSymp, ifacerefp->modportName(),
+                                                              LinkNodeMatcherModport());
                     ifacerefp->modportFileline()->v3error(
                         "Modport not found under interface "
                         << ifacerefp->prettyNameQ(ifacerefp->ifaceName()) << ": "
@@ -658,8 +658,8 @@ public:
 
     static string removeLastInlineScope(const string& name) {
         string out = name;
-        string dot = "__DOT__";
-        size_t dotPos = out.rfind(dot, out.size() - dot.length() - 2);
+        const string dot = "__DOT__";
+        const size_t dotPos = out.rfind(dot, out.size() - dot.length() - 2);
         if (dotPos == string::npos) {
             return "";
         } else {
@@ -676,12 +676,12 @@ public:
                      << ((lookupSymp->symPrefix() == "") ? "" : " as ")
                      << ((lookupSymp->symPrefix() == "") ? "" : lookupSymp->symPrefix() + dotname)
                      << "  at se" << lookupSymp << endl);
-        string prefix = lookupSymp->symPrefix();
+        const string prefix = lookupSymp->symPrefix();
         VSymEnt* foundp = nullptr;
         while (!foundp) {
             foundp = lookupSymp->findIdFallback(prefix + dotname);  // Might be nullptr
             if (prefix.empty()) break;
-            string nextPrefix = removeLastInlineScope(prefix);
+            const string nextPrefix = removeLastInlineScope(prefix);
             if (prefix == nextPrefix) break;
         }
         if (!foundp) baddot = dotname;
@@ -778,8 +778,9 @@ class LinkDotFindVisitor final : public AstNVisitor {
         // m_curSymp/m_modSymp maybe nullptr for packages and non-top modules
         // Packages will be under top after the initial phases, but until then
         // need separate handling
-        bool standalonePkg = !m_modSymp && (m_statep->forPrearray() && VN_IS(nodep, Package));
-        bool doit = (m_modSymp || standalonePkg);
+        const bool standalonePkg
+            = !m_modSymp && (m_statep->forPrearray() && VN_IS(nodep, Package));
+        const bool doit = (m_modSymp || standalonePkg);
         VL_RESTORER(m_scope);
         VL_RESTORER(m_classOrPackagep);
         VL_RESTORER(m_modSymp);
@@ -888,11 +889,11 @@ class LinkDotFindVisitor final : public AstNVisitor {
         VL_RESTORER(m_inRecursion);
         // Where do we add it?
         VSymEnt* aboveSymp = m_curSymp;
-        string origname = AstNode::dedotName(nodep->name());
+        const string origname = AstNode::dedotName(nodep->name());
         string::size_type pos;
         if ((pos = origname.rfind('.')) != string::npos) {
             // Flattened, find what CellInline it should live under
-            string scope = origname.substr(0, pos);
+            const string scope = origname.substr(0, pos);
             string baddot;
             VSymEnt* okSymp;
             aboveSymp = m_statep->findDotted(nodep->fileline(), aboveSymp, scope, baddot, okSymp);
@@ -913,11 +914,11 @@ class LinkDotFindVisitor final : public AstNVisitor {
         UINFO(5, "   CELLINLINE under " << m_scope << " is " << nodep << endl);
         VSymEnt* aboveSymp = m_curSymp;
         // If baz__DOT__foo__DOT__bar, we need to find baz__DOT__foo and add bar to it.
-        string dottedname = nodep->name();
+        const string dottedname = nodep->name();
         string::size_type pos;
         if ((pos = dottedname.rfind("__DOT__")) != string::npos) {
-            string dotted = dottedname.substr(0, pos);
-            string ident = dottedname.substr(pos + strlen("__DOT__"));
+            const string dotted = dottedname.substr(0, pos);
+            const string ident = dottedname.substr(pos + strlen("__DOT__"));
             string baddot;
             VSymEnt* okSymp;
             aboveSymp = m_statep->findDotted(nodep->fileline(), aboveSymp, dotted, baddot, okSymp);
@@ -1004,7 +1005,7 @@ class LinkDotFindVisitor final : public AstNVisitor {
                 m_classOrPackagep = VN_CAST(m_curSymp->nodep(), Class);
             }
             // Create symbol table for the task's vars
-            string name = string{nodep->isExternProto() ? "extern " : ""} + nodep->name();
+            const string name = string{nodep->isExternProto() ? "extern " : ""} + nodep->name();
             m_curSymp = m_statep->insertBlock(m_curSymp, name, nodep, m_classOrPackagep);
             m_curSymp->fallbackp(upSymp);
             // Convert the func's range to the output variable
@@ -1068,7 +1069,8 @@ class LinkDotFindVisitor final : public AstNVisitor {
                     bool nansiBad
                         = ((findvarp->isDeclTyped() && nodep->isDeclTyped())
                            || (findvarp->isIO() && nodep->isIO()));  // e.g. !(output && output)
-                    bool ansiBad = findvarp->isAnsi() || nodep->isAnsi();  // dup illegal with ANSI
+                    const bool ansiBad
+                        = findvarp->isAnsi() || nodep->isAnsi();  // dup illegal with ANSI
                     if (ansiBad || nansiBad) {
                         bool ansiWarn = ansiBad && !nansiBad;
                         if (ansiWarn) {
@@ -1134,7 +1136,7 @@ class LinkDotFindVisitor final : public AstNVisitor {
                             = new AstVar(nodep->fileline(), AstVarType(AstVarType::GPARAM),
                                          nodep->name(), nodep);
                         newp->combineType(nodep);
-                        string svalue = v3Global.opt.parameter(nodep->name());
+                        const string svalue = v3Global.opt.parameter(nodep->name());
                         if (AstNode* valuep
                             = AstConst::parseParamLiteral(nodep->fileline(), svalue)) {
                             newp->valuep(valuep);
@@ -1268,12 +1270,12 @@ class LinkDotFindVisitor final : public AstNVisitor {
     }
     virtual void visit(AstWithParse* nodep) override {
         // Change WITHPARSE(FUNCREF, equation) to FUNCREF(WITH(equation))
-        auto funcrefp = VN_CAST(nodep->funcrefp(), NodeFTaskRef);
+        const auto funcrefp = VN_CAST(nodep->funcrefp(), NodeFTaskRef);
         UASSERT_OBJ(funcrefp, nodep, "'with' only can operate on a function/task");
         string name = "item";
         FileLine* argFl = nodep->fileline();
-        if (auto argp = VN_CAST(funcrefp->pinsp(), Arg)) {
-            if (auto parserefp = VN_CAST(argp->exprp(), ParseRef)) {
+        if (const auto argp = VN_CAST(funcrefp->pinsp(), Arg)) {
+            if (const auto parserefp = VN_CAST(argp->exprp(), ParseRef)) {
                 name = parserefp->name();
                 argFl = parserefp->fileline();
             } else {
@@ -1557,7 +1559,7 @@ class LinkDotScopeVisitor final : public AstNVisitor {
                     = LinkDotState::ifaceRefFromArray(nodep->varp()->dtypep());
                 UASSERT_OBJ(dtypep, nodep, "Non AstIfaceRefDType on isIfaceRef() var");
                 UINFO(9, "Iface parent dtype " << dtypep << endl);
-                string ifcellname = dtypep->cellName();
+                const string ifcellname = dtypep->cellName();
                 string baddot;
                 VSymEnt* okSymp;
                 VSymEnt* cellSymp = m_statep->findDotted(nodep->fileline(), m_modSymp, ifcellname,
@@ -1644,7 +1646,8 @@ class LinkDotScopeVisitor final : public AstNVisitor {
 
             UASSERT_OBJ(refp || xrefp, nodep,
                         "Unsupported: Non Var(X)Ref attached to interface pin");
-            string scopename = refp ? refp->varp()->name() : xrefp->dotted() + "." + xrefp->name();
+            const string scopename
+                = refp ? refp->varp()->name() : xrefp->dotted() + "." + xrefp->name();
             string baddot;
             VSymEnt* okSymp;
             VSymEnt* symp = m_statep->findDotted(nodep->lhsp()->fileline(), m_modSymp, scopename,
@@ -1844,8 +1847,8 @@ private:
         if (!nodep->varp()) {
             if (!noWarn) {
                 if (nodep->fileline()->warnIsOff(V3ErrorCode::I_DEF_NETTYPE_WIRE)) {
-                    string suggest = m_statep->suggestSymFallback(moduleSymp, nodep->name(),
-                                                                  LinkNodeMatcherVar());
+                    const string suggest = m_statep->suggestSymFallback(moduleSymp, nodep->name(),
+                                                                        LinkNodeMatcherVar());
                     nodep->v3error("Signal definition not found, and implicit disabled with "
                                    "`default_nettype: "
                                    << nodep->prettyNameQ() << '\n'
@@ -1855,8 +1858,8 @@ private:
                 // Bypass looking for suggestions if IMPLICIT is turned off
                 // as there could be thousands of these suppressed in large netlists
                 else if (!nodep->fileline()->warnIsOff(V3ErrorCode::IMPLICIT)) {
-                    string suggest = m_statep->suggestSymFallback(moduleSymp, nodep->name(),
-                                                                  LinkNodeMatcherVar());
+                    const string suggest = m_statep->suggestSymFallback(moduleSymp, nodep->name(),
+                                                                        LinkNodeMatcherVar());
                     nodep->v3warn(IMPLICIT,
                                   "Signal definition not found, creating implicitly: "
                                       << nodep->prettyNameQ() << '\n'
@@ -1905,7 +1908,7 @@ private:
         }
     }
     AstVar* findIfaceTopVarp(AstNode* nodep, VSymEnt* parentEntp, const string& name) {
-        string findName = name + "__Viftop";
+        const string findName = name + "__Viftop";
         VSymEnt* ifaceSymp = parentEntp->findIdFallback(findName);
         AstVar* ifaceTopVarp = ifaceSymp ? VN_CAST(ifaceSymp->nodep(), Var) : nullptr;
         UASSERT_OBJ(ifaceTopVarp, nodep, "Can't find interface var ref: " << findName);
@@ -2057,8 +2060,8 @@ private:
         // DOT(DOT(DOT(PARSEREF(text), ...
         if (nodep->user3SetOnce()) return;
         UINFO(8, "     " << nodep << endl);
-        DotStates lastStates = m_ds;
-        bool start = (m_ds.m_dotPos == DP_NONE);  // Save, as m_dotp will be changed
+        const DotStates lastStates = m_ds;
+        const bool start = (m_ds.m_dotPos == DP_NONE);  // Save, as m_dotp will be changed
         {
             if (start) {  // Starting dot sequence
                 if (debug() >= 9) nodep->dumpTree("-dot-in: ");
@@ -2088,14 +2091,14 @@ private:
                     nodep->v3error("'super' used outside class (IEEE 1800-2017 8.15)");
                     m_ds.m_dotErr = true;
                 } else {
-                    auto classp = VN_CAST(classSymp->nodep(), Class);
+                    const auto classp = VN_CAST(classSymp->nodep(), Class);
                     if (!classp->extendsp()) {
                         nodep->v3error("'super' used on non-extended class (IEEE 1800-2017 8.15)");
                         m_ds.m_dotErr = true;
                     } else {
-                        auto cextp = VN_CAST(classp->extendsp(), ClassExtends);
+                        const auto cextp = VN_CAST(classp->extendsp(), ClassExtends);
                         UASSERT_OBJ(cextp, nodep, "Bad super extends link");
-                        auto sclassp = cextp->classp();
+                        const auto sclassp = cextp->classp();
                         UASSERT_OBJ(sclassp, nodep, "Bad superclass");
                         m_ds.m_dotSymp = m_statep->getNodeSym(sclassp);
                         UINFO(8, "     super. " << m_ds.ascii() << endl);
@@ -2161,8 +2164,8 @@ private:
         UASSERT_OBJ(m_statep->forPrimary() || m_statep->forPrearray(), nodep,
                     "ParseRefs should no longer exist");
         if (nodep->name() == "super") nodep->v3warn(E_UNSUPPORTED, "Unsupported: super");
-        DotStates lastStates = m_ds;
-        bool start = (m_ds.m_dotPos == DP_NONE);  // Save, as m_dotp will be changed
+        const DotStates lastStates = m_ds;
+        const bool start = (m_ds.m_dotPos == DP_NONE);  // Save, as m_dotp will be changed
         if (start) {
             m_ds.init(m_curSymp);
             // Note m_ds.m_dot remains nullptr; this is a reference not under a dot
@@ -2175,8 +2178,8 @@ private:
             && nodep->name() == "index") {
             // 'with' statement's 'item.index'
             iterateChildren(nodep);
-            auto newp = new AstLambdaArgRef(nodep->fileline(),
-                                            m_ds.m_unlinkedScopep->name() + "__DOT__index", true);
+            const auto newp = new AstLambdaArgRef(
+                nodep->fileline(), m_ds.m_unlinkedScopep->name() + "__DOT__index", true);
             nodep->replaceWith(newp);
             VL_DO_DANGLING(pushDeletep(nodep), nodep);
             return;
@@ -2304,8 +2307,8 @@ private:
                         }
                         m_ds.m_dotText = "";
                         if (m_ds.m_unresolved && m_ds.m_unlinkedScopep) {
-                            string dotted = refp->dotted();
-                            size_t pos = dotted.find("__BRA__??__KET__");
+                            const string dotted = refp->dotted();
+                            const size_t pos = dotted.find("__BRA__??__KET__");
                             // Arrays of interfaces all have the same parameters
                             if (pos != string::npos && varp->isParam()
                                 && VN_IS(m_ds.m_unlinkedScopep, CellArrayRef)) {
@@ -2402,9 +2405,9 @@ private:
             //
             if (!ok) {
                 // Cells/interfaces can't be implicit
-                bool isCell = foundp ? VN_IS(foundp->nodep(), Cell) : false;
-                bool checkImplicit = (!m_ds.m_dotp && m_ds.m_dotText == "" && !isCell);
-                bool err = !(checkImplicit && m_statep->implicitOk(m_modp, nodep->name()));
+                const bool isCell = foundp ? VN_IS(foundp->nodep(), Cell) : false;
+                const bool checkImplicit = (!m_ds.m_dotp && m_ds.m_dotText == "" && !isCell);
+                const bool err = !(checkImplicit && m_statep->implicitOk(m_modp, nodep->name()));
                 if (err) {
                     if (foundp) {
                         nodep->v3error("Found definition of '"
@@ -2415,7 +2418,7 @@ private:
                     } else if (m_ds.m_dotText == "") {
                         UINFO(7, "   ErrParseRef curSymp=se" << cvtToHex(m_curSymp)
                                                              << " ds=" << m_ds.ascii() << endl);
-                        string suggest = m_statep->suggestSymFallback(
+                        const string suggest = m_statep->suggestSymFallback(
                             m_ds.m_dotSymp, nodep->name(), VNodeMatcher());
                         nodep->v3error("Can't find definition of "
                                        << expectWhat << ": " << nodep->prettyNameQ() << '\n'
@@ -2486,7 +2489,7 @@ private:
                 // variable name lower down with same scope name we want to
                 // ignore (t_math_divw)
                 dotSymp = m_modSymp;
-                string inl = AstNode::dedotName(nodep->inlinedDots());
+                const string inl = AstNode::dedotName(nodep->inlinedDots());
                 dotSymp = m_statep->findDotted(nodep->fileline(), dotSymp, inl, baddot, okSymp);
                 UASSERT_OBJ(dotSymp, nodep,
                             "Couldn't resolve inlined scope " << AstNode::prettyNameQ(baddot)
@@ -2641,7 +2644,7 @@ private:
                     // variable name lower down with same scope name we want
                     // to ignore (t_math_divw)
                     dotSymp = m_modSymp;
-                    string inl = AstNode::dedotName(nodep->inlinedDots());
+                    const string inl = AstNode::dedotName(nodep->inlinedDots());
                     UINFO(8, "    Inlined " << inl << endl);
                     dotSymp
                         = m_statep->findDotted(nodep->fileline(), dotSymp, inl, baddot, okSymp);
@@ -2708,15 +2711,15 @@ private:
                                 "Unsupported or unknown PLI call: " << nodep->prettyNameQ());
                         }
                     } else {
-                        string suggest = m_statep->suggestSymFallback(dotSymp, nodep->name(),
-                                                                      LinkNodeMatcherFTask());
+                        const string suggest = m_statep->suggestSymFallback(
+                            dotSymp, nodep->name(), LinkNodeMatcherFTask());
                         nodep->v3error("Can't find definition of task/function: "
                                        << nodep->prettyNameQ() << '\n'
                                        << (suggest.empty() ? "" : nodep->warnMore() + suggest));
                     }
                 } else {
-                    string suggest = m_statep->suggestSymFallback(dotSymp, nodep->name(),
-                                                                  LinkNodeMatcherFTask());
+                    const string suggest = m_statep->suggestSymFallback(dotSymp, nodep->name(),
+                                                                        LinkNodeMatcherFTask());
                     nodep->v3error("Can't find definition of "
                                    << AstNode::prettyNameQ(baddot) << " in dotted task/function: '"
                                    << nodep->dotted() + "." + nodep->prettyName() << "'\n"
@@ -2880,7 +2883,7 @@ private:
                             }
                         }
                         if (!ok) {
-                            string suggest = m_statep->suggestSymFallback(
+                            const string suggest = m_statep->suggestSymFallback(
                                 m_curSymp, cpackagerefp->name(), LinkNodeMatcherClass{});
                             cpackagerefp->v3error(
                                 "Class to extend not found: "
diff --git a/src/V3LinkInc.cpp b/src/V3LinkInc.cpp
index 379b5f3e9..00e9ef6ea 100644
--- a/src/V3LinkInc.cpp
+++ b/src/V3LinkInc.cpp
@@ -189,7 +189,7 @@ private:
 
         // Prepare a temporary variable
         FileLine* fl = backp->fileline();
-        string name = string("__Vincrement") + cvtToStr(++m_modIncrementsNum);
+        const string name = string("__Vincrement") + cvtToStr(++m_modIncrementsNum);
         AstVar* varp = new AstVar(fl, AstVarType::BLOCKTEMP, name, VFlagChildDType(),
                                   varrefp->varp()->subDTypep()->cloneTree(true));
 
diff --git a/src/V3LinkJump.cpp b/src/V3LinkJump.cpp
index 8a9547c3b..c81bf09f8 100644
--- a/src/V3LinkJump.cpp
+++ b/src/V3LinkJump.cpp
@@ -144,7 +144,7 @@ private:
         //    REPEAT(count,body) -> loop=count,WHILE(loop>0) { body, loop-- }
         // Note var can be signed or unsigned based on original number.
         AstNode* countp = nodep->countp()->unlinkFrBackWithNext();
-        string name = string("__Vrepeat") + cvtToStr(m_modRepeatNum++);
+        const string name = string("__Vrepeat") + cvtToStr(m_modRepeatNum++);
         // Spec says value is integral, if negative is ignored
         AstVar* varp = new AstVar(nodep->fileline(), AstVarType::BLOCKTEMP, name,
                                   nodep->findSigned32DType());
diff --git a/src/V3LinkParse.cpp b/src/V3LinkParse.cpp
index 7744e6bfb..310a5ff37 100644
--- a/src/V3LinkParse.cpp
+++ b/src/V3LinkParse.cpp
@@ -157,13 +157,13 @@ private:
                 // We check this rule in the parser, so shouldn't fire
                 nodep->v3error("Enum ranges must be integral, per spec");
             }  // LCOV_EXCL_STOP
-            int left = nodep->rangep()->leftConst();
-            int right = nodep->rangep()->rightConst();
-            int increment = (left > right) ? -1 : 1;
+            const int left = nodep->rangep()->leftConst();
+            const int right = nodep->rangep()->rightConst();
+            const int increment = (left > right) ? -1 : 1;
             int offset_from_init = 0;
             AstNode* addp = nullptr;
             for (int i = left; i != (right + increment); i += increment, offset_from_init++) {
-                string name = nodep->name() + cvtToStr(i);
+                const string name = nodep->name() + cvtToStr(i);
                 AstNode* valuep = nullptr;
                 if (nodep->valuep()) {
                     valuep = new AstAdd(
@@ -350,7 +350,7 @@ private:
             m_varp->addNext(nodep);
             // lvalue is true, because we know we have a verilator public_flat_rw
             // but someday we may be more general
-            bool lvalue = m_varp->isSigUserRWPublic();
+            const bool lvalue = m_varp->isSigUserRWPublic();
             nodep->addStmtp(
                 new AstVarRef(nodep->fileline(), m_varp, lvalue ? VAccess::WRITE : VAccess::READ));
         }
@@ -540,10 +540,10 @@ private:
         cleanFileline(nodep);
         AstNode* backp = nodep->backp();
         // IEEE says directly nested item is not a new block
-        bool nestedIf = (nodep->implied()  // User didn't provide begin/end
-                         && (VN_IS(nodep->stmtsp(), GenIf)
-                             || VN_IS(nodep->stmtsp(), GenCase))  // Has an if/case
-                         && !nodep->stmtsp()->nextp());  // Has only one item
+        const bool nestedIf = (nodep->implied()  // User didn't provide begin/end
+                               && (VN_IS(nodep->stmtsp(), GenIf)
+                                   || VN_IS(nodep->stmtsp(), GenCase))  // Has an if/case
+                               && !nodep->stmtsp()->nextp());  // Has only one item
         // It's not FOR(BEGIN(...)) but we earlier changed it to BEGIN(FOR(...))
         if (nodep->genforp()) {
             ++m_genblkNum;
diff --git a/src/V3LinkResolve.cpp b/src/V3LinkResolve.cpp
index 09f71d11a..e8713e179 100644
--- a/src/V3LinkResolve.cpp
+++ b/src/V3LinkResolve.cpp
@@ -153,7 +153,7 @@ private:
             AstNode* sensp = nodep->sensp();
             if (sensp && !VN_IS(sensp, NodeVarRef) && !VN_IS(sensp, Const)) {
                 // Make a new temp wire
-                string newvarname = "__Vsenitemexpr" + cvtToStr(++m_senitemCvtNum);
+                const string newvarname = "__Vsenitemexpr" + cvtToStr(++m_senitemCvtNum);
                 AstVar* newvarp = new AstVar(sensp->fileline(), AstVarType::MODULETEMP, newvarname,
                                              VFlagLogicPacked(), 1);
                 // We can't just add under the module, because we may be
@@ -354,14 +354,14 @@ private:
                     continue;
                 }
                 AstConst* constp = VN_CAST(argp, Const);
-                bool isFromString = (constp) ? constp->num().isFromString() : false;
+                const bool isFromString = (constp) ? constp->num().isFromString() : false;
                 if (isFromString) {
-                    int numchars = argp->dtypep()->width() / 8;
+                    const int numchars = argp->dtypep()->width() / 8;
                     string str(numchars, ' ');
                     // now scan for % operators
                     bool inpercent = false;
                     for (int i = 0; i < numchars; i++) {
-                        int ii = numchars - i - 1;
+                        const int ii = numchars - i - 1;
                         char c = constp->num().dataByte(ii);
                         str[i] = c;
                         if (!inpercent && c == '%') {
@@ -454,7 +454,7 @@ private:
             }
             nodep->hasFormat(true);
         }
-        string newFormat = expectFormat(nodep, nodep->text(), nodep->exprsp(), false);
+        const string newFormat = expectFormat(nodep, nodep->text(), nodep->exprsp(), false);
         nodep->text(newFormat);
         if ((VN_IS(nodep->backp(), Display)
              && VN_CAST(nodep->backp(), Display)->displayType().needScopeTracking())
diff --git a/src/V3List.h b/src/V3List.h
index 62f89c942..c1af060f0 100644
--- a/src/V3List.h
+++ b/src/V3List.h
@@ -78,7 +78,7 @@ public:
     void pushBack(V3List<T>& listr, T newp) {
         // "this" must be a element inside of *newp
         // cppcheck-suppress thisSubtraction
-        size_t offset = (size_t)(vluint8_t*)(this) - (size_t)(vluint8_t*)(newp);
+        const size_t offset = (size_t)(vluint8_t*)(this) - (size_t)(vluint8_t*)(newp);
         m_nextp = nullptr;
         if (!listr.m_headp) listr.m_headp = newp;
         m_prevp = listr.m_tailp;
@@ -88,7 +88,7 @@ public:
     void pushFront(V3List<T>& listr, T newp) {
         // "this" must be a element inside of *newp
         // cppcheck-suppress thisSubtraction
-        size_t offset = (size_t)(vluint8_t*)(this) - (size_t)(vluint8_t*)(newp);
+        const size_t offset = (size_t)(vluint8_t*)(this) - (size_t)(vluint8_t*)(newp);
         m_nextp = listr.m_headp;
         if (m_nextp) baseToListEnt(m_nextp, offset)->m_prevp = newp;
         listr.m_headp = newp;
@@ -99,7 +99,7 @@ public:
     void unlink(V3List<T>& listr, T oldp) {
         // "this" must be a element inside of *oldp
         // cppcheck-suppress thisSubtraction
-        size_t offset = (size_t)(vluint8_t*)(this) - (size_t)(vluint8_t*)(oldp);
+        const size_t offset = (size_t)(vluint8_t*)(this) - (size_t)(vluint8_t*)(oldp);
         if (m_nextp) {
             baseToListEnt(m_nextp, offset)->m_prevp = m_prevp;
         } else {
diff --git a/src/V3Name.cpp b/src/V3Name.cpp
index 7a57f42f8..ef90a8265 100644
--- a/src/V3Name.cpp
+++ b/src/V3Name.cpp
@@ -48,16 +48,16 @@ private:
     void rename(AstNode* nodep, bool addPvt) {
         if (!nodep->user1()) {  // Not already done
             if (addPvt) {
-                string newname = string("__PVT__") + nodep->name();
+                const string newname = string("__PVT__") + nodep->name();
                 nodep->name(newname);
                 nodep->editCountInc();
             } else if (VN_IS(nodep, CFunc) && VN_CAST(nodep, CFunc)->isConstructor()) {
             } else {
-                string rsvd = V3LanguageWords::isKeyword(nodep->name());
+                const string rsvd = V3LanguageWords::isKeyword(nodep->name());
                 if (rsvd != "") {
                     nodep->v3warn(SYMRSVDWORD,
                                   "Symbol matches " + rsvd + ": " << nodep->prettyNameQ());
-                    string newname = string("__SYM__") + nodep->name();
+                    const string newname = string("__SYM__") + nodep->name();
                     nodep->name(newname);
                     nodep->editCountInc();
                 }
diff --git a/src/V3Number.cpp b/src/V3Number.cpp
index 6abe9d4ae..13e60f862 100644
--- a/src/V3Number.cpp
+++ b/src/V3Number.cpp
@@ -100,7 +100,7 @@ V3Number::V3Number(VerilogStringLiteral, AstNode* nodep, const string& str) {
     init(nodep, str.length() * 8);
     m_fromString = true;
     for (unsigned pos = 0; pos < str.length(); ++pos) {
-        int topos = str.length() - 1 - pos;
+        const int topos = str.length() - 1 - pos;
         for (int bit = 0; bit < 8; ++bit) {
             if (str[pos] & (1UL << bit)) {
                 m_value[topos / 4] |= (1UL << (bit + (topos % 4) * 8));
@@ -515,10 +515,10 @@ string V3Number::ascii(bool prefixed, bool cleanVerilog) const {
         if (isSigned()) out << "s";
     }
 
-    bool binary = (isFourState()
+    const bool binary = (isFourState()
 #ifdef V3NUMBER_ASCII_BINARY
-                   // cppcheck-suppress konwnConditionTrueFalse
-                   || true
+                         // cppcheck-suppress konwnConditionTrueFalse
+                         || true
 #endif
     );
     // out<<"-"<<hex<<m_value[0]<<"-";
@@ -586,7 +586,7 @@ string V3Number::displayed(FileLine* fl, const string& vformat) const {
         fmtsize += pos[0];
     }
     string str;
-    char code = tolower(pos[0]);
+    const char code = tolower(pos[0]);
     switch (code) {
     case 'b': {
         int bit = width() - 1;
@@ -655,14 +655,14 @@ string V3Number::displayed(FileLine* fl, const string& vformat) const {
                 if (fmtsize != "0") str += ' ';
             }
         }
-        size_t fmtsizen = static_cast<size_t>(atoi(fmtsize.c_str()));
+        const size_t fmtsizen = static_cast<size_t>(atoi(fmtsize.c_str()));
         str = displayPad(fmtsizen, ' ', left, str);
         return str;
     }
     case '~':  // Signed decimal
     case 't':  // Time
     case 'd': {  // Unsigned decimal
-        bool issigned = (code == '~');
+        const bool issigned = (code == '~');
         if (fmtsize == "") {
             const double mantissabits = this->width() - (issigned ? 1 : 0);
             // To get the number of digits required, we want to compute
@@ -686,9 +686,9 @@ string V3Number::displayed(FileLine* fl, const string& vformat) const {
                 str = cvtToStr(toUQuad());
             }
         }
-        bool zeropad = fmtsize.length() > 0 && fmtsize[0] == '0';
+        const bool zeropad = fmtsize.length() > 0 && fmtsize[0] == '0';
         // fmtsize might have changed since we parsed the %fmtsize
-        size_t fmtsizen = static_cast<size_t>(atoi(fmtsize.c_str()));
+        const size_t fmtsizen = static_cast<size_t>(atoi(fmtsize.c_str()));
         str = displayPad(fmtsizen, (zeropad ? '0' : ' '), left, str);
         return str;
     }
@@ -741,7 +741,7 @@ string V3Number::displayed(FileLine* fl, const string& vformat) const {
         return str;
     }
     case '@': {  // Packed string
-        size_t fmtsizen = static_cast<size_t>(atoi(fmtsize.c_str()));
+        const size_t fmtsizen = static_cast<size_t>(atoi(fmtsize.c_str()));
         str = displayPad(fmtsizen, ' ', left, toString());
         return str;
     }
@@ -762,7 +762,7 @@ string V3Number::toDecimalS() const {
 }
 
 string V3Number::toDecimalU() const {
-    int maxdecwidth = (width() + 3) * 4 / 3;
+    const int maxdecwidth = (width() + 3) * 4 / 3;
 
     // Or (maxdecwidth+7)/8], but can't have more than 4 BCD bits per word
     V3Number bcd(this, maxdecwidth + 4);
@@ -1161,7 +1161,7 @@ V3Number& V3Number::opCLog2(const V3Number& lhs) {
     NUM_ASSERT_LOGIC_ARGS1(lhs);
     if (lhs.isFourState()) return setAllBitsX();
     // IE if 4, this algorithm didn't pre-subtract 1, so we need to post-correct now
-    int adjust = (lhs.countOnes() == 1) ? 0 : 1;
+    const int adjust = (lhs.countOnes() == 1) ? 0 : 1;
     for (int bit = lhs.width() - 1; bit >= 0; bit--) {
         if (lhs.bitIs1(bit)) {
             setLong(bit + adjust);
@@ -1331,9 +1331,9 @@ V3Number& V3Number::opStreamL(const V3Number& lhs, const V3Number& rhs) {
         v3warn(WIDTHCONCAT, "Unsized numbers/parameters not allowed in streams.");
     }
     // Slice size should never exceed the lhs width
-    int ssize = std::min(rhs.toUInt(), static_cast<unsigned>(lhs.width()));
+    const int ssize = std::min(rhs.toUInt(), static_cast<unsigned>(lhs.width()));
     for (int istart = 0; istart < lhs.width(); istart += ssize) {
-        int ostart = std::max(0, lhs.width() - ssize - istart);
+        const int ostart = std::max(0, lhs.width() - ssize - istart);
         for (int bit = 0; bit < ssize && bit < lhs.width() - istart; bit++) {
             setBit(ostart + bit, lhs.bitIs(istart + bit));
         }
@@ -1472,8 +1472,8 @@ V3Number& V3Number::opCompareNN(const V3Number& lhs, const V3Number& rhs, bool i
     // SystemVerilog Language Standard does not allow a string variable to contain '\0'.
     // So C functions such as strcmp() can correctly compare strings.
     int result;
-    string lstring = lhs.toString();
-    string rstring = rhs.toString();
+    const string lstring = lhs.toString();
+    const string rstring = rhs.toString();
     if (ignoreCase) {
         result = VL_STRCASECMP(lstring.c_str(), rstring.c_str());
     } else {
@@ -1609,7 +1609,7 @@ V3Number& V3Number::opGtS(const V3Number& lhs, const V3Number& rhs) {
     NUM_ASSERT_LOGIC_ARGS2(lhs, rhs);
     char outc = 0;
     {
-        int mbit = std::max(lhs.width() - 1, rhs.width() - 1);
+        const int mbit = std::max(lhs.width() - 1, rhs.width() - 1);
         if (lhs.bitIsXZ(mbit)) {
             outc = 'x';
         } else if (rhs.bitIsXZ(mbit)) {
@@ -1735,7 +1735,7 @@ V3Number& V3Number::opAdd(const V3Number& lhs, const V3Number& rhs) {
     // Addem
     int carry = 0;
     for (int bit = 0; bit < this->width(); bit++) {
-        int sum = ((lhs.bitIs1(bit) ? 1 : 0) + (rhs.bitIs1(bit) ? 1 : 0) + carry);
+        const int sum = ((lhs.bitIs1(bit) ? 1 : 0) + (rhs.bitIs1(bit) ? 1 : 0) + carry);
         if (sum & 1) setBit(bit, 1);
         carry = (sum >= 2);
     }
@@ -1871,7 +1871,7 @@ V3Number& V3Number::opModDivGuts(const V3Number& lhs, const V3Number& rhs, bool
     NUM_ASSERT_LOGIC_ARGS2(lhs, rhs);
     setZero();
     // Find MSB and check for zero.
-    int words = lhs.words();
+    const int words = lhs.words();
     int umsbp1 = lhs.mostSetBitP1();  // dividend
     int vmsbp1 = rhs.mostSetBitP1();  // divisor
     if (VL_UNLIKELY(vmsbp1 == 0)  // rwp==0 so division by zero.  Return 0.
@@ -1880,8 +1880,8 @@ V3Number& V3Number::opModDivGuts(const V3Number& lhs, const V3Number& rhs, bool
         return *this;
     }
 
-    int uw = (umsbp1 + 31) / 32;  // aka "m" in the algorithm
-    int vw = (vmsbp1 + 31) / 32;  // aka "n" in the algorithm
+    const int uw = (umsbp1 + 31) / 32;  // aka "m" in the algorithm
+    const int vw = (vmsbp1 + 31) / 32;  // aka "n" in the algorithm
 
     if (vw == 1) {  // Single divisor word breaks rest of algorithm
         vluint64_t k = 0;
@@ -2084,7 +2084,7 @@ V3Number& V3Number::opExtendS(const V3Number& lhs, uint32_t lbits) {
     NUM_ASSERT_LOGIC_ARGS1(lhs);
     setZero();
     for (int bit = 0; bit < width(); bit++) {
-        char extendWith = lhs.bitIsExtend(bit, lbits);
+        const char extendWith = lhs.bitIsExtend(bit, lbits);
         setBit(bit, extendWith);
     }
     return *this;
@@ -2170,7 +2170,7 @@ V3Number& V3Number::opIToRD(const V3Number& lhs, bool isSigned) {
     V3Number noxz(lhs);
     noxz.opAssignNonXZ(lhs);
     double d = 0;
-    bool negate = isSigned && noxz.isNegative();
+    const bool negate = isSigned && noxz.isNegative();
     if (negate) {
         V3Number noxz_signed = noxz;
         noxz.opNegate(noxz_signed);
@@ -2201,15 +2201,15 @@ V3Number& V3Number::opRToIRoundS(const V3Number& lhs) {
     u.d = v;
     if (u.d == 0.0) {}
 
-    int exp = static_cast<int>((u.q >> 52ULL) & VL_MASK_Q(11)) - 1023;
-    int lsb = exp - 52;
+    const int exp = static_cast<int>((u.q >> 52ULL) & VL_MASK_Q(11)) - 1023;
+    const int lsb = exp - 52;
     vluint64_t mantissa = (u.q & VL_MASK_Q(52)) | (1ULL << 52);
     if (v != 0) {
         // IEEE format: [63]=sign [62:52]=exp+1023 [51:0]=mantissa
         // This does not need to support subnormals as they are sub-integral
         for (int bit = 0; bit <= 52; ++bit) {
             if (mantissa & (1ULL << bit)) {
-                int outbit = bit + lsb;
+                const int outbit = bit + lsb;
                 if (outbit >= 0) setBit(outbit, 1);
             }
         }
diff --git a/src/V3Number_test.cpp b/src/V3Number_test.cpp
index 1e3b142f0..91034ca7b 100644
--- a/src/V3Number_test.cpp
+++ b/src/V3Number_test.cpp
@@ -34,7 +34,7 @@ void test(const string& lhss, const string& op, const string& rhss, const string
     char* r1 = strdup(rhss.c_str());
     char* e1 = strdup(exps.c_str());
 
-    FileLine fl = new FileLine(FileLine::builtInFinename());
+    const FileLine fl = new FileLine(FileLine::builtInFinename());
 
     V3Number lhnum(fl, l1);
     V3Number rhnum(fl, r1);
diff --git a/src/V3OptionParser.cpp b/src/V3OptionParser.cpp
index dd26b0846..c6eec718c 100644
--- a/src/V3OptionParser.cpp
+++ b/src/V3OptionParser.cpp
@@ -116,7 +116,7 @@ V3OPTION_PARSER_DEF_ACT_CB_CLASS(ActionCbPartialMatchVal, void(const char*, cons
 // Member functions of V3OptionParser
 
 V3OptionParser::ActionIfs* V3OptionParser::find(const char* optp) {
-    auto it = m_pimpl->m_options.find(optp);
+    const auto it = m_pimpl->m_options.find(optp);
     if (it != m_pimpl->m_options.end()) return it->second.get();
     for (auto&& act : m_pimpl->m_options) {
         if (act.second->isOnOffAllowed()) {  // Find starts with "-no"
@@ -218,7 +218,7 @@ V3OptionParser::ActionIfs&
 V3OptionParser::AppendHelper::operator()(const char* optp, CbPartialMatch,
                                          Impl::ActionCbPartialMatch::CbType cb) const {
     const size_t prefixLen = std::strlen(optp);
-    auto wrap = [prefixLen, cb](const char* optp) { cb(optp + prefixLen); };
+    const auto wrap = [prefixLen, cb](const char* optp) { cb(optp + prefixLen); };
     return m_parser.add<Impl::ActionCbPartialMatch>(optp, std::move(wrap));
 }
 
diff --git a/src/V3Options.cpp b/src/V3Options.cpp
index dfc5ff830..0944e812b 100644
--- a/src/V3Options.cpp
+++ b/src/V3Options.cpp
@@ -126,7 +126,7 @@ V3LangCode::V3LangCode(const char* textp) {
 VTimescale::VTimescale(const string& value, bool& badr)
     : m_e{VTimescale::NONE} {
     badr = true;
-    string spaceless = VString::removeWhitespace(value);
+    const string spaceless = VString::removeWhitespace(value);
     for (int i = TS_100S; i < _ENUM_END; ++i) {
         VTimescale ts(i);
         if (spaceless == ts.ascii()) {
@@ -339,7 +339,7 @@ bool V3Options::hasParameter(const string& name) {
 }
 
 string V3Options::parameter(const string& name) {
-    string value = m_parameters.find(name)->second;
+    const string value = m_parameters.find(name)->second;
     m_parameters.erase(m_parameters.find(name));
     return value;
 }
@@ -432,7 +432,7 @@ string V3Options::allArgsStringForHierBlock(bool forTop) const {
 bool V3Options::fileStatNormal(const string& filename) {
     // NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
     struct stat sstat;  // Stat information
-    int err = stat(filename.c_str(), &sstat);
+    const int err = stat(filename.c_str(), &sstat);
     if (err != 0) return false;
     if (S_ISDIR(sstat.st_mode)) return false;
     return true;
@@ -454,8 +454,8 @@ string V3Options::fileExists(const string& filename) {
     // is quite slow; presumably because of re-reading each directory
     // many times.  So we read a whole dir at once and cache it
 
-    string dir = V3Os::filenameDir(filename);
-    string basename = V3Os::filenameNonDir(filename);
+    const string dir = V3Os::filenameDir(filename);
+    const string basename = V3Os::filenameNonDir(filename);
 
     auto diriter = m_impp->m_dirMap.find(dir);
     if (diriter == m_impp->m_dirMap.end()) {
@@ -477,14 +477,14 @@ string V3Options::fileExists(const string& filename) {
         return "";  // Not found
     }
     // Check if it is a directory, ignore if so
-    string filenameOut = V3Os::filenameFromDirBase(dir, basename);
+    const string filenameOut = V3Os::filenameFromDirBase(dir, basename);
     if (!fileStatNormal(filenameOut)) return "";  // Directory
     return filenameOut;
 }
 
 string V3Options::filePathCheckOneDir(const string& modname, const string& dirname) {
     for (const string& i : m_impp->m_libExtVs) {
-        string fn = V3Os::filenameFromDirBase(dirname, modname + i);
+        const string fn = V3Os::filenameFromDirBase(dirname, modname + i);
         string exists = fileExists(fn);
         if (exists != "") {
             // Strip ./, it just looks ugly
@@ -518,16 +518,16 @@ string V3Options::filePath(FileLine* fl, const string& modname, const string& la
     // using the incdir and libext's.
     // Return "" if not found.
     for (const string& dir : m_impp->m_incDirUsers) {
-        string exists = filePathCheckOneDir(modname, dir);
+        const string exists = filePathCheckOneDir(modname, dir);
         if (exists != "") return exists;
     }
     for (const string& dir : m_impp->m_incDirFallbacks) {
-        string exists = filePathCheckOneDir(modname, dir);
+        const string exists = filePathCheckOneDir(modname, dir);
         if (exists != "") return exists;
     }
 
     if (m_relativeIncludes) {
-        string exists = filePathCheckOneDir(modname, lastpath);
+        const string exists = filePathCheckOneDir(modname, lastpath);
         if (exists != "") return V3Os::filenameRealPath(exists);
     }
 
@@ -554,13 +554,13 @@ void V3Options::filePathLookedMsg(FileLine* fl, const string& modname) {
         std::cerr << V3Error::warnMore() << "... Looked in:" << endl;
         for (const string& dir : m_impp->m_incDirUsers) {
             for (const string& ext : m_impp->m_libExtVs) {
-                string fn = V3Os::filenameFromDirBase(dir, modname + ext);
+                const string fn = V3Os::filenameFromDirBase(dir, modname + ext);
                 std::cerr << V3Error::warnMore() << "     " << fn << endl;
             }
         }
         for (const string& dir : m_impp->m_incDirFallbacks) {
             for (const string& ext : m_impp->m_libExtVs) {
-                string fn = V3Os::filenameFromDirBase(dir, modname + ext);
+                const string fn = V3Os::filenameFromDirBase(dir, modname + ext);
                 std::cerr << V3Error::warnMore() << "     " << fn << endl;
             }
         }
@@ -633,16 +633,16 @@ string V3Options::getenvSYSTEMC_ARCH() {
     if (var == "") {
 #if defined(__MINGW32__)
         // Hardcoded with MINGW current version. Would like a better way.
-        string sysname = "MINGW32_NT-5.0";
+        const string sysname = "MINGW32_NT-5.0";
         var = "mingw32";
 #elif defined(_WIN32)
-        string sysname = "WIN32";
+        const string sysname = "WIN32";
         var = "win32";
 #else
         // NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
         struct utsname uts;
         uname(&uts);
-        string sysname = VString::downcase(uts.sysname);  // aka  'uname -s'
+        const string sysname = VString::downcase(uts.sysname);  // aka  'uname -s'
         if (VL_UNCOVERABLE(VString::wildmatch(sysname.c_str(), "*solaris*"))) {
             var = "gccsparcOS5";
         } else if (VL_UNCOVERABLE(VString::wildmatch(sysname.c_str(), "*cygwin*"))) {
@@ -663,7 +663,7 @@ string V3Options::getenvSYSTEMC_INCLUDE() {
         V3Os::setenvStr("SYSTEMC_INCLUDE", var, "Hardcoded at build time");
     }
     if (var == "") {
-        string sc = getenvSYSTEMC();
+        const string sc = getenvSYSTEMC();
         if (sc != "") var = sc + "/include";
     }
     return var;
@@ -676,8 +676,8 @@ string V3Options::getenvSYSTEMC_LIBDIR() {
         V3Os::setenvStr("SYSTEMC_LIBDIR", var, "Hardcoded at build time");
     }
     if (var == "") {
-        string sc = getenvSYSTEMC();
-        string arch = getenvSYSTEMC_ARCH();
+        const string sc = getenvSYSTEMC();
+        const string arch = getenvSYSTEMC_ARCH();
         if (sc != "" && arch != "") var = sc + "/lib-" + arch;
     }
     return var;
@@ -899,7 +899,7 @@ void V3Options::parseOptsList(FileLine* fl, const string& optdir, int argc, char
     V3OptionParser::AppendHelper DECL_OPTION{parser};
     V3OPTION_PARSER_DECL_TAGS;
 
-    auto callStrSetter = [this](void (V3Options::*cbStr)(const string&)) {
+    const auto callStrSetter = [this](void (V3Options::*cbStr)(const string&)) {
         return [this, cbStr](const string& v) { (this->*cbStr)(v); };
     };
     // Usage
@@ -1104,7 +1104,7 @@ void V3Options::parseOptsList(FileLine* fl, const string& optdir, int argc, char
     DECL_OPTION("-inline-mult", Set, &m_inlineMult);
 
     DECL_OPTION("-LDFLAGS", CbVal, callStrSetter(&V3Options::addLdLibs));
-    auto setLang = [this, fl](const char* valp) {
+    const auto setLang = [this, fl](const char* valp) {
         V3LangCode optval = V3LangCode(valp);
         if (optval.legal()) {
             m_defaultLanguage = optval;
@@ -1473,7 +1473,7 @@ void V3Options::parseOptsList(FileLine* fl, const string& optdir, int argc, char
             }
         } else {
             // Filename
-            string filename = parseFileArg(optdir, argv[i]);
+            const string filename = parseFileArg(optdir, argv[i]);
             if (suffixed(filename, ".cpp")  //
                 || suffixed(filename, ".cxx")  //
                 || suffixed(filename, ".cc")  //
@@ -1507,7 +1507,7 @@ void V3Options::parseOptsFile(FileLine* fl, const string& filename, bool rel) {
     string whole_file;
     bool inCmt = false;
     while (!ifp->eof()) {
-        string line = V3Os::getline(*ifp);
+        const string line = V3Os::getline(*ifp);
         // Strip simple comments
         string oline;
         // cppcheck-suppress StlMissingComparison
@@ -1625,7 +1625,7 @@ void V3Options::parseOptsFile(FileLine* fl, const string& filename, bool rel) {
     }
 
     // Path
-    string optdir = (rel ? V3Os::filenameDir(filename) : ".");
+    const string optdir = (rel ? V3Os::filenameDir(filename) : ".");
 
     // Convert to argv style arg list and parse them
     std::vector<char*> argv;
@@ -1649,7 +1649,7 @@ string V3Options::parseFileArg(const string& optdir, const string& relfilename)
 bool V3Options::parseLangExt(const char* swp,  //!< argument text
                              const char* langswp,  //!< option to match
                              const V3LangCode& lc) {  //!< language code
-    int len = strlen(langswp);
+    const int len = strlen(langswp);
     if (!strncmp(swp, langswp, len)) {
         addLangExt(swp + len, lc);
         return true;
@@ -1747,7 +1747,7 @@ void V3Options::setDebugSrcLevel(const string& srcfile, int level) {
 int V3Options::debugSrcLevel(const string& srcfile_path, int default_level) {
     // For simplicity, calling functions can just use __FILE__ for srcfile.
     // That means though we need to cleanup the filename from ../Foo.cpp -> Foo
-    string srcfile = V3Os::filenameNonDirExt(srcfile_path);
+    const string srcfile = V3Os::filenameNonDirExt(srcfile_path);
     const auto iter = m_debugSrcs.find(srcfile);
     if (iter != m_debugSrcs.end()) {
         return iter->second;
@@ -1768,7 +1768,7 @@ void V3Options::setDumpTreeLevel(const string& srcfile, int level) {
 int V3Options::dumpTreeLevel(const string& srcfile_path) {
     // For simplicity, calling functions can just use __FILE__ for srcfile.
     // That means though we need to cleanup the filename from ../Foo.cpp -> Foo
-    string srcfile = V3Os::filenameNonDirExt(srcfile_path);
+    const string srcfile = V3Os::filenameNonDirExt(srcfile_path);
     const auto iter = m_dumpTrees.find(srcfile);
     if (iter != m_dumpTrees.end()) {
         return iter->second;
@@ -1779,7 +1779,7 @@ int V3Options::dumpTreeLevel(const string& srcfile_path) {
 
 void V3Options::optimize(int level) {
     // Set all optimizations to on/off
-    bool flag = level > 0;
+    const bool flag = level > 0;
     m_oAcycSimp = flag;
     m_oAssemble = flag;
     m_oCase = flag;
diff --git a/src/V3Order.cpp b/src/V3Order.cpp
index d2df50e84..011bed102 100644
--- a/src/V3Order.cpp
+++ b/src/V3Order.cpp
@@ -322,9 +322,9 @@ private:
     virtual void visit(AstConcat* nodep) override {
         if (m_inAss) {
             iterateAndNextNull(nodep->lhsp());
-            int lw = m_childClkWidth;
+            const int lw = m_childClkWidth;
             iterateAndNextNull(nodep->rhsp());
-            int rw = m_childClkWidth;
+            const int rw = m_childClkWidth;
             m_childClkWidth = lw + rw;  // Pass up
         }
     }
@@ -502,7 +502,7 @@ private:
             if (edgep->weight() == 0) {  // Was cut
                 continue;
             }
-            int weight = edgep->weight();
+            const int weight = edgep->weight();
             if (const OrderLogicVertex* toLVertexp
                 = dynamic_cast<const OrderLogicVertex*>(edgep->top())) {
 
@@ -758,7 +758,7 @@ private:
     string cfuncName(AstNodeModule* modp, AstSenTree* domainp, AstScope* scopep,
                      AstNode* forWhatp) {
         modp->user3Inc();
-        int funcnum = modp->user3();
+        const int funcnum = modp->user3();
         string name = (domainp->hasCombo()
                            ? "_combo"
                            : (domainp->hasInitial()
@@ -805,7 +805,7 @@ private:
                     nodep->fileline()->modifyWarnOff(V3ErrorCode::UNOPT,
                                                      true);  // Complain just once
                     // Give the user an example.
-                    bool tempWeight = (edgep && edgep->weight() == 0);
+                    const bool tempWeight = (edgep && edgep->weight() == 0);
                     // Else the below loop detect can't see the loop
                     if (tempWeight) edgep->weight(1);
                     // Calls OrderGraph::loopsVertexCb
@@ -824,7 +824,7 @@ private:
                     nodep->fileline()->modifyWarnOff(V3ErrorCode::UNOPTFLAT,
                                                      true);  // Complain just once
                     // Give the user an example.
-                    bool tempWeight = (edgep && edgep->weight() == 0);
+                    const bool tempWeight = (edgep && edgep->weight() == 0);
                     // Else the below loop detect can't see the loop
                     if (tempWeight) edgep->weight(1);
                     // Calls OrderGraph::loopsVertexCb
@@ -914,7 +914,7 @@ private:
             // Only reporting on standard variable vertices
             AstVar* varp = vsvertexp->varScp()->varp();
             if (!varp->user3()) {
-                string name = varp->prettyName();
+                const string name = varp->prettyName();
                 if ((varp->width() != 1) && (name.find("__Vdly") == string::npos)
                     && (name.find("__Vcell") == string::npos)) {
                     // Variable to report on and not yet done
@@ -1221,7 +1221,7 @@ public:
     virtual ~OrderVisitor() override {
         // Stats
         for (int type = 0; type < OrderVEdgeType::_ENUM_END; type++) {
-            double count = double(m_statCut[type]);
+            const double count = double(m_statCut[type]);
             if (count != 0.0) {
                 V3Stats::addStat(string("Order, cut, ") + OrderVEdgeType(type).ascii(), count);
             }
@@ -1250,8 +1250,8 @@ static bool domainsExclusive(const AstSenTree* fromp, const AstSenTree* top) {
     //
     // ... unless you know more about A and B, which sounds hard.
 
-    bool toInitial = top->hasInitial() || top->hasSettle();
-    bool fromInitial = fromp->hasInitial() || fromp->hasSettle();
+    const bool toInitial = top->hasInitial() || top->hasSettle();
+    const bool fromInitial = fromp->hasInitial() || fromp->hasSettle();
     if (toInitial != fromInitial) return true;
 
     const AstSenItem* fromSenListp = VN_CAST(fromp->sensesp(), SenItem);
@@ -1492,7 +1492,7 @@ void OrderVisitor::processDomainsIterate(OrderEitherVertex* vertexp) {
                     // Ignore that we have a constant (initial) input
                 } else if (domainp != fromVertexp->domainp()) {
                     // Make a domain that merges the two domains
-                    bool ddebug = debug() >= 9;
+                    const bool ddebug = debug() >= 9;
 
                     if (ddebug) {  // LCOV_EXCL_START
 
@@ -1544,7 +1544,7 @@ void OrderVisitor::processDomainsIterate(OrderEitherVertex* vertexp) {
 
 void OrderVisitor::processEdgeReport() {
     // Make report of all signal names and what clock edges they have
-    string filename = v3Global.debugFilename("order_edges.txt");
+    const string filename = v3Global.debugFilename("order_edges.txt");
     const std::unique_ptr<std::ofstream> logp(V3File::new_ofstream(filename));
     if (logp->fail()) v3fatal("Can't write " << filename);
     // Testing emitter: V3EmitV::verilogForTree(v3Global.rootp(), *logp);
@@ -1850,7 +1850,7 @@ void OrderVisitor::processMTasks() {
     const V3GraphVertex* moveVxp;
     while ((moveVxp = emit_logic.nextp())) {
         const MTaskMoveVertex* movep = dynamic_cast<const MTaskMoveVertex*>(moveVxp);
-        unsigned mtaskId = movep->color();
+        const unsigned mtaskId = movep->color();
         UASSERT(mtaskId > 0, "Every MTaskMoveVertex should have an mtask assignment >0");
         if (movep->logicp()) {
             // Add this logic to the per-mtask order
@@ -2003,7 +2003,8 @@ void OrderVisitor::process() {
     // Dump data
     m_graph.dumpDotFilePrefixed("orderg_done");
     if (false && debug()) {
-        string dfilename = v3Global.opt.makeDir() + "/" + v3Global.opt.prefix() + "_INT_order";
+        const string dfilename
+            = v3Global.opt.makeDir() + "/" + v3Global.opt.prefix() + "_INT_order";
         const std::unique_ptr<std::ofstream> logp(V3File::new_ofstream(dfilename));
         if (logp->fail()) v3fatal("Can't write " << dfilename);
         m_graph.dump(*logp);
diff --git a/src/V3Os.cpp b/src/V3Os.cpp
index c3648025b..683aa8b99 100644
--- a/src/V3Os.cpp
+++ b/src/V3Os.cpp
@@ -103,7 +103,7 @@ void V3Os::setenvStr(const string& envvar, const string& value, const string& wh
 #else
     // setenv() replaced by putenv() in Solaris environment. Prototype is different
     // putenv() requires NAME=VALUE format
-    string vareq = envvar + "=" + value;
+    const string vareq = envvar + "=" + value;
     putenv(const_cast<char*>(vareq.c_str()));
 #endif
 }
@@ -168,7 +168,7 @@ string V3Os::filenameSubstitute(const string& filename) {
                 || ((brackets == PAREN) && (filename[endpos + 1] != ')'))) {
                 v3fatal("Unmatched brackets in variable substitution in file: " + filename);
             }
-            string envvar = filename.substr(pos + 1, endpos - pos);
+            const string envvar = filename.substr(pos + 1, endpos - pos);
             string envvalue;
             if (!envvar.empty()) envvalue = getenvStr(envvar, "");
             if (!envvalue.empty()) {
@@ -239,7 +239,7 @@ void V3Os::unlinkRegexp(const string& dir, const string& regexp) {
     if (DIR* dirp = opendir(dir.c_str())) {
         while (struct dirent* direntp = readdir(dirp)) {
             if (VString::wildmatch(direntp->d_name, regexp.c_str())) {
-                string fullname = dir + "/" + string(direntp->d_name);
+                const string fullname = dir + "/" + string(direntp->d_name);
 #if defined(_WIN32) || defined(__MINGW32__)
                 _unlink(fullname.c_str());
 #else
@@ -269,8 +269,8 @@ string V3Os::trueRandom(size_t size) {
     // Note: std::string.data() returns a non-const Char* from C++17 onwards.
     // For pre-C++17, this cast is OK in practice, even though it's UB.
 #if defined(_WIN32) || defined(__MINGW32__)
-    NTSTATUS hr = BCryptGenRandom(nullptr, reinterpret_cast<BYTE*>(data), size,
-                                  BCRYPT_USE_SYSTEM_PREFERRED_RNG);
+    const NTSTATUS hr = BCryptGenRandom(nullptr, reinterpret_cast<BYTE*>(data), size,
+                                        BCRYPT_USE_SYSTEM_PREFERRED_RNG);
     if (!BCRYPT_SUCCESS(hr)) v3fatal("Could not acquire random data.");
 #else
     std::ifstream is("/dev/urandom", std::ios::in | std::ios::binary);
@@ -307,7 +307,7 @@ uint64_t V3Os::timeUsecs() {
 
 uint64_t V3Os::memUsageBytes() {
 #if defined(_WIN32) || defined(__MINGW32__)
-    HANDLE process = GetCurrentProcess();
+    const HANDLE process = GetCurrentProcess();
     PROCESS_MEMORY_COUNTERS pmc;
     if (GetProcessMemoryInfo(process, &pmc, sizeof(pmc))) {
         // The best we can do using simple Windows APIs is to get the size of the working set.
@@ -320,10 +320,10 @@ uint64_t V3Os::memUsageBytes() {
     FILE* fp = fopen(statmFilename, "r");
     if (!fp) return 0;
     vluint64_t size, resident, share, text, lib, data, dt;  // All in pages
-    int items = fscanf(fp,
-                       "%" VL_PRI64 "u %" VL_PRI64 "u %" VL_PRI64 "u %" VL_PRI64 "u %" VL_PRI64
-                       "u %" VL_PRI64 "u %" VL_PRI64 "u",
-                       &size, &resident, &share, &text, &lib, &data, &dt);
+    const int items = fscanf(fp,
+                             "%" VL_PRI64 "u %" VL_PRI64 "u %" VL_PRI64 "u %" VL_PRI64
+                             "u %" VL_PRI64 "u %" VL_PRI64 "u %" VL_PRI64 "u",
+                             &size, &resident, &share, &text, &lib, &data, &dt);
     fclose(fp);
     if (VL_UNCOVERABLE(7 != items)) return 0;
     return (text + data) * getpagesize();
diff --git a/src/V3Param.cpp b/src/V3Param.cpp
index a681572c0..a90403382 100644
--- a/src/V3Param.cpp
+++ b/src/V3Param.cpp
@@ -282,7 +282,7 @@ class ParamProcessor final {
                     usedLetter[static_cast<int>(ch)]++;
                 }
             } else if (AstParamTypeDType* typep = VN_CAST(stmtp, ParamTypeDType)) {
-                char ch = 'T';
+                const char ch = 'T';
                 typep->user4(usedLetter[static_cast<int>(ch)] * 256 + ch);
                 usedLetter[static_cast<int>(ch)]++;
             }
@@ -291,7 +291,7 @@ class ParamProcessor final {
     string paramSmallName(AstNodeModule* modp, AstNode* varp) {
         if (varp->user4() <= 1) makeSmallNames(modp);
         int index = varp->user4() / 256;
-        char ch = varp->user4() & 255;
+        const char ch = varp->user4() & 255;
         string st = cvtToStr(ch);
         while (index) {
             st += cvtToStr(char((index % 25) + 'A'));
@@ -477,7 +477,7 @@ class ParamProcessor final {
 
         string longname = modp->name();
         for (auto&& defaultValue : paramsIt->second) {
-            auto pinIt = pins.find(defaultValue.first);
+            const auto pinIt = pins.find(defaultValue.first);
             AstConst* constp = pinIt == pins.end() ? defaultValue.second : pinIt->second;
             // This longname is not valid as verilog symbol, but ok, because it will be hashed
             longname += "_" + defaultValue.first + "=";
@@ -485,7 +485,7 @@ class ParamProcessor final {
             if (constp) longname += constp->num().ascii(false);
         }
 
-        auto iter = m_longMap.find(longname);
+        const auto iter = m_longMap.find(longname);
         if (iter != m_longMap.end()) return iter->second;  // Already calculated
 
         VHashSha256 hash;
@@ -538,7 +538,7 @@ class ParamProcessor final {
         insertp->addNextHere(newmodp);
 
         m_modNameMap.emplace(newmodp->name(), ModInfo(newmodp));
-        auto iter = m_modNameMap.find(newname);
+        const auto iter = m_modNameMap.find(newname);
         CloneMap* clonemapp = &(iter->second.m_cloneMap);
         UINFO(4, "     De-parameterize to new: " << newmodp << endl);
 
@@ -773,7 +773,8 @@ public:
             // We need to relink the pins to the new module
             relinkPinsByName(nodep->pinsp(), paramedModp);
         } else {
-            string newname = srcModp->hierBlock() ? longname : moduleCalcName(srcModp, longname);
+            const string newname
+                = srcModp->hierBlock() ? longname : moduleCalcName(srcModp, longname);
             const ModInfo* modInfop
                 = moduleFindOrClone(srcModp, nodep, nodep->paramsp(), newname, ifaceRefRefs);
             // Have child use this module instead.
@@ -980,7 +981,7 @@ class ParamVisitor final : public AstNVisitor {
     }
     virtual void visit(AstVarXRef* nodep) override {
         // Check to see if the scope is just an interface because interfaces are special
-        string dotted = nodep->dotted();
+        const string dotted = nodep->dotted();
         if (!dotted.empty() && nodep->varp() && nodep->varp()->isParam()) {
             AstNode* backp = nodep;
             while ((backp = backp->backp())) {
@@ -1048,9 +1049,9 @@ class ParamVisitor final : public AstNVisitor {
     virtual void visit(AstCellArrayRef* nodep) override {
         V3Const::constifyParamsEdit(nodep->selp());
         if (const AstConst* constp = VN_CAST(nodep->selp(), Const)) {
-            string index = AstNode::encodeNumber(constp->toSInt());
-            string replacestr = nodep->name() + "__BRA__??__KET__";
-            size_t pos = m_unlinkedTxt.find(replacestr);
+            const string index = AstNode::encodeNumber(constp->toSInt());
+            const string replacestr = nodep->name() + "__BRA__??__KET__";
+            const size_t pos = m_unlinkedTxt.find(replacestr);
             UASSERT_OBJ(pos != string::npos, nodep,
                         "Could not find array index in unlinked text: '"
                             << m_unlinkedTxt << "' for node: " << nodep);
@@ -1105,7 +1106,7 @@ class ParamVisitor final : public AstNVisitor {
             // doesn't conflict in V3LinkDot resolution with other genvars
             // Now though we need to change BEGIN("zzz", GENFOR(...)) to
             // a BEGIN("zzz__BRA__{loop#}__KET__")
-            string beginName = nodep->name();
+            const string beginName = nodep->name();
             // Leave the original Begin, as need a container for the (possible) GENVAR
             // Note V3Unroll will replace some AstVarRef's to the loop variable with constants
             // Don't remove any deleted nodes in m_unroller until whole process finishes,
diff --git a/src/V3ParseImp.cpp b/src/V3ParseImp.cpp
index 349fd6cc3..9a6272e45 100644
--- a/src/V3ParseImp.cpp
+++ b/src/V3ParseImp.cpp
@@ -165,11 +165,11 @@ void V3ParseImp::lexErrorPreprocDirective(FileLine* fl, const char* textp) {
     VSpellCheck speller;
     for (V3LanguageWords::const_iterator it = V3LanguageWords::begin();
          it != V3LanguageWords::end(); ++it) {
-        string ppDirective = it->first;
+        const string ppDirective = it->first;
         if (ppDirective[0] == '`') speller.pushCandidate(ppDirective);
     }
     V3PreShell::candidateDefines(&speller);
-    string suggest = speller.bestCandidateMsg(textp);
+    const string suggest = speller.bestCandidateMsg(textp);
     fl->v3error("Define or directive not defined: '"
                 << textp << "'\n"
                 << (suggest.empty() ? "" : fl->warnMore() + suggest));
@@ -183,7 +183,7 @@ string V3ParseImp::lexParseTag(const char* textp) {
 }
 
 double V3ParseImp::lexParseTimenum(const char* textp) {
-    size_t length = strlen(textp);
+    const size_t length = strlen(textp);
     char* strgp = new char[length + 1];
     char* dp = strgp;
     const char* sp = textp;
@@ -227,7 +227,7 @@ size_t V3ParseImp::ppInputToLex(char* buf, size_t max_size) {
         m_ppBuffers.pop_front();
         size_t len = front.length();
         if (len > (max_size - got)) {  // Front string too big
-            string remainder = front.substr(max_size - got);
+            const string remainder = front.substr(max_size - got);
             front = front.substr(0, max_size - got);
             m_ppBuffers.push_front(remainder);  // Put back remainder for next time
             len = (max_size - got);
@@ -236,7 +236,7 @@ size_t V3ParseImp::ppInputToLex(char* buf, size_t max_size) {
         got += len;
     }
     if (debug() >= 9) {
-        string out = string(buf, got);
+        const string out = string(buf, got);
         cout << "   inputToLex  got=" << got << " '" << out << "'" << endl;
     }
     // Note returns 0 at EOF
@@ -247,7 +247,7 @@ void V3ParseImp::preprocDumps(std::ostream& os) {
     if (v3Global.opt.dumpDefines()) {
         V3PreShell::dumpDefines(os);
     } else {
-        bool noblanks = v3Global.opt.preprocOnly() && v3Global.opt.preprocNoLine();
+        const bool noblanks = v3Global.opt.preprocOnly() && v3Global.opt.preprocNoLine();
         for (auto& buf : m_ppBuffers) {
             if (noblanks) {
                 bool blank = true;
@@ -266,7 +266,7 @@ void V3ParseImp::preprocDumps(std::ostream& os) {
 
 void V3ParseImp::parseFile(FileLine* fileline, const string& modfilename, bool inLibrary,
                            const string& errmsg) {  // "" for no error, make fake node
-    string modname = V3Os::filenameNonExt(modfilename);
+    const string modname = V3Os::filenameNonExt(modfilename);
 
     UINFO(2, __FUNCTION__ << ": " << modname << (inLibrary ? " [LIB]" : "") << endl);
     m_lexFileline = new FileLine(fileline);
@@ -275,7 +275,7 @@ void V3ParseImp::parseFile(FileLine* fileline, const string& modfilename, bool i
     m_inLibrary = inLibrary;
 
     // Preprocess into m_ppBuffer
-    bool ok = V3PreShell::preproc(fileline, modfilename, m_filterp, this, errmsg);
+    const bool ok = V3PreShell::preproc(fileline, modfilename, m_filterp, this, errmsg);
     if (!ok) {
         if (errmsg != "") return;  // Threw error already
         // Create fake node for later error reporting
@@ -351,7 +351,7 @@ size_t V3ParseImp::tokenPipeScanParam(size_t depth) {
     depth += 2;  // Past the (
     int parens = 1;  // Count first (
     while (true) {
-        int tok = tokenPeekp(depth)->token;
+        const int tok = tokenPeekp(depth)->token;
         if (tok == 0) {
             UINFO(9, "tokenPipeScanParam hit EOF; probably syntax error to come");
             break;
@@ -392,7 +392,7 @@ void V3ParseImp::tokenPipeline() {
         }
         V3ParseBisonYYSType curValue = yylval;  // Remember value, as about to read ahead
         const V3ParseBisonYYSType* nexttokp = tokenPeekp(0);
-        int nexttok = nexttokp->token;
+        const int nexttok = nexttokp->token;
         yylval = curValue;
         // Now potentially munge the current token
         if (token == '('
@@ -467,7 +467,7 @@ void V3ParseImp::tokenPipeline() {
             } else if (nexttok == '#') {
                 V3ParseBisonYYSType curValue = yylval;  // Remember value, as about to read ahead
                 {
-                    size_t depth = tokenPipeScanParam(0);
+                    const size_t depth = tokenPipeScanParam(0);
                     if (tokenPeekp(depth)->token == yP_COLONCOLON) token = yaID__CC;
                 }
                 yylval = curValue;
diff --git a/src/V3ParseLex.cpp b/src/V3ParseLex.cpp
index a53f3d569..79a9a3438 100644
--- a/src/V3ParseLex.cpp
+++ b/src/V3ParseLex.cpp
@@ -53,7 +53,7 @@ void V3ParseImp::lexUnputString(const char* textp, size_t length) {
 void V3ParseImp::yylexReadTok() {
     // Call yylex() remembering last non-whitespace token
     parsep()->lexFileline()->startToken();
-    int token = parsep()->m_lexerp->yylex();
+    const int token = parsep()->m_lexerp->yylex();
     m_lexPrevToken = token;  // Save so can find '#' to parse following number
     yylval.token = token;
 }
diff --git a/src/V3Partition.cpp b/src/V3Partition.cpp
index d00870844..4f51ed0ec 100644
--- a/src/V3Partition.cpp
+++ b/src/V3Partition.cpp
@@ -622,7 +622,7 @@ public:
     }
 
     static void dumpCpFilePrefixed(const V3Graph* graphp, const string& nameComment) {
-        string filename = v3Global.debugFilename(nameComment) + ".txt";
+        const string filename = v3Global.debugFilename(nameComment) + ".txt";
         UINFO(1, "Writing " << filename << endl);
         std::unique_ptr<std::ofstream> ofp(V3File::new_ofstream(filename));
         std::ostream* osp = &(*ofp);  // &* needed to deref unique_ptr
@@ -901,7 +901,7 @@ private:
 // vertex.
 static void partInitHalfCriticalPaths(GraphWay way, V3Graph* mtasksp, bool checkOnly) {
     GraphStreamUnordered order(mtasksp, way);
-    GraphWay rev = way.invert();
+    const GraphWay rev = way.invert();
     for (const V3GraphVertex* vertexp; (vertexp = order.nextp());) {
         const LogicMTask* mtaskcp = dynamic_cast<const LogicMTask*>(vertexp);
         LogicMTask* mtaskp = const_cast<LogicMTask*>(mtaskcp);
@@ -997,7 +997,7 @@ static V3GraphEdge* partBlastEdgep(GraphWay way, V3GraphEdge* edgep) {
 static void partMergeEdgesFrom(V3Graph* mtasksp, LogicMTask* recipientp, LogicMTask* donorp,
                                V3Scoreboard<MergeCandidate, uint32_t>* sbp) {
     for (unsigned wi = 0; wi < 2; ++wi) {
-        GraphWay way = wi ? GraphWay::REVERSE : GraphWay::FORWARD;
+        const GraphWay way = wi ? GraphWay::REVERSE : GraphWay::FORWARD;
         for (V3GraphEdge* edgep = donorp->beginp(way); edgep; edgep = partBlastEdgep(way, edgep)) {
             MTaskEdge* tedgep = MTaskEdge::cast(edgep);
             if (sbp && !tedgep->removedFromSb()) sbp->removeElem(tedgep);
@@ -1252,7 +1252,7 @@ private:
             erased = m_pairs.erase(*pairp);
             UASSERT_OBJ(erased > 0, mtaskp, "Expected existing mtask");
         }
-        size_t erased = m_mtask2sibs.erase(mtaskp);
+        const size_t erased = m_mtask2sibs.erase(mtaskp);
         UASSERT_OBJ(erased > 0, mtaskp, "Expected existing mtask");
     }
 
@@ -1297,10 +1297,10 @@ private:
         //
         // These 'NewCp' objects carry a bit indicating whether we must
         // propagate CP for each of the four cases:
-        NewCp recipientNewCpFwd = newCp(GraphWay::FORWARD, recipientp, donorp, mergeEdgep);
-        NewCp donorNewCpFwd = newCp(GraphWay::FORWARD, donorp, recipientp, mergeEdgep);
-        NewCp recipientNewCpRev = newCp(GraphWay::REVERSE, recipientp, donorp, mergeEdgep);
-        NewCp donorNewCpRev = newCp(GraphWay::REVERSE, donorp, recipientp, mergeEdgep);
+        const NewCp recipientNewCpFwd = newCp(GraphWay::FORWARD, recipientp, donorp, mergeEdgep);
+        const NewCp donorNewCpFwd = newCp(GraphWay::FORWARD, donorp, recipientp, mergeEdgep);
+        const NewCp recipientNewCpRev = newCp(GraphWay::REVERSE, recipientp, donorp, mergeEdgep);
+        const NewCp donorNewCpRev = newCp(GraphWay::REVERSE, donorp, recipientp, mergeEdgep);
 
         if (mergeEdgep) {
             // Remove and free the connecting edge. Must do this before
@@ -2456,7 +2456,7 @@ void V3Partition::go(V3Graph* mtasksp) {
     // remove this later if it doesn't really help.
     mtasksp->orderPreRanked();
 
-    int targetParFactor = v3Global.opt.threads();
+    const int targetParFactor = v3Global.opt.threads();
     if (targetParFactor < 2) v3fatalSrc("We should not reach V3Partition when --threads <= 1");
 
     // Set cpLimit to roughly totalGraphCost / nThreads
@@ -2464,8 +2464,8 @@ void V3Partition::go(V3Graph* mtasksp) {
     // Actually set it a bit lower, by a hardcoded fudge factor. This
     // results in more smaller mtasks, which helps reduce fragmentation
     // when scheduling them.
-    unsigned fudgeNumerator = 3;
-    unsigned fudgeDenominator = 5;
+    const unsigned fudgeNumerator = 3;
+    const unsigned fudgeDenominator = 5;
     uint32_t cpLimit = ((totalGraphCost * fudgeNumerator) / (targetParFactor * fudgeDenominator));
     UINFO(4, "V3Partition set cpLimit = " << cpLimit << endl);
 
diff --git a/src/V3PreProc.cpp b/src/V3PreProc.cpp
index 87fbf38ef..3bf62d303 100644
--- a/src/V3PreProc.cpp
+++ b/src/V3PreProc.cpp
@@ -550,7 +550,7 @@ void V3PreProcImp::unputString(const string& strg) {
 }
 
 void V3PreProcImp::unputDefrefString(const string& strg) {
-    int multiline = std::count(strg.begin(), strg.end(), '\n');
+    const int multiline = std::count(strg.begin(), strg.end(), '\n');
     unputString(strg);
     // A define that inserts multiple newlines are really attributed to one source line,
     // so temporarily don't increment lineno.
@@ -591,7 +591,7 @@ string V3PreProcImp::defineSubst(VDefineRef* refp) {
         UINFO(4, "defineArg[" << i << "] = '" << refp->args()[i] << "'" << endl);
     }
     // Grab value
-    string value = defValue(refp->name());
+    const string value = defValue(refp->name());
     UINFO(4, "defineValue    '" << V3PreLex::cleanDbgStrg(value) << "'" << endl);
 
     std::map<const string, string> argValueByName;
@@ -603,7 +603,7 @@ string V3PreProcImp::defineSubst(VDefineRef* refp) {
         bool quote = false;
         bool haveDefault = false;
         // Note there's a leading ( and trailing ), so parens==1 is the base parsing level
-        string params = refp->params();  // Must keep str in scope to get pointer
+        const string params = refp->params();  // Must keep str in scope to get pointer
         const char* cp = params.c_str();
         if (*cp == '(') cp++;
         for (; *cp; cp++) {
@@ -626,7 +626,7 @@ string V3PreProcImp::defineSubst(VDefineRef* refp) {
                             // A call `def( a ) must be equivalent to `def(a ), so trimWhitespace
                             // At one point we didn't trim trailing
                             // whitespace, but this confuses `"
-                            string arg = trimWhitespace(refp->args()[numArgs], true);
+                            const string arg = trimWhitespace(refp->args()[numArgs], true);
                             if (arg != "") valueDef = arg;
                         } else if (!haveDefault) {
                             error("Define missing argument '" + argName + "' for: " + refp->name()
@@ -698,7 +698,7 @@ string V3PreProcImp::defineSubst(VDefineRef* refp) {
                 const auto iter = argValueByName.find(argName);
                 if (iter != argValueByName.end()) {
                     // Substitute
-                    string subst = iter->second;
+                    const string subst = iter->second;
                     if (subst == "") {
                         // Normally `` is removed later, but with no token after, we're otherwise
                         // stuck, so remove proceeding ``
@@ -780,7 +780,7 @@ void V3PreProcImp::openFile(FileLine*, VInFilter* filterp, const string& filenam
 
     // Read a list<string> with the whole file.
     StrList wholefile;
-    bool ok = filterp->readWholefile(filename, wholefile /*ref*/);
+    const bool ok = filterp->readWholefile(filename, wholefile /*ref*/);
     if (!ok) {
         error("File not found: " + filename + "\n");
         return;
@@ -956,7 +956,7 @@ void V3PreProcImp::debugToken(int tok, const char* cmtp) {
         string::size_type pos;
         while ((pos = buf.find('\n')) != string::npos) { buf.replace(pos, 1, "\\n"); }
         while ((pos = buf.find('\r')) != string::npos) { buf.replace(pos, 1, "\\r"); }
-        string flcol = m_lexp->m_tokFilelinep->asciiLineCol();
+        const string flcol = m_lexp->m_tokFilelinep->asciiLineCol();
         fprintf(stderr, "%s: %s %s %s(%d) dr%d:  <%d>%-10s: %s\n", flcol.c_str(), cmtp,
                 (m_off ? "of" : "on"), procStateName(state()), static_cast<int>(m_states.size()),
                 static_cast<int>(m_defRefs.size()), m_lexp->currentStartState(), tokenName(tok),
@@ -1069,11 +1069,11 @@ int V3PreProcImp::getStateToken() {
                         error("`elsif with no matching `if\n");
                     } else {
                         // Handle `else portion
-                        VPreIfEntry lastIf = m_ifdefStack.top();
+                        const VPreIfEntry lastIf = m_ifdefStack.top();
                         m_ifdefStack.pop();
                         if (!lastIf.on()) parsingOn();
                         // Handle `if portion
-                        bool enable = !lastIf.everOn() && defExists(m_lastSym);
+                        const bool enable = !lastIf.everOn() && defExists(m_lastSym);
                         UINFO(4, "Elsif " << m_lastSym << (enable ? " ON" : " OFF") << endl);
                         m_ifdefStack.push(VPreIfEntry(enable, lastIf.everOn()));
                         if (!enable) parsingOff();
@@ -1142,7 +1142,7 @@ int V3PreProcImp::getStateToken() {
                          << "'  formals='" << V3PreLex::cleanDbgStrg(m_formals) << "'\n";
                 }
                 // Add any formals
-                string formals = m_formals;
+                const string formals = m_formals;
                 string value = m_lexp->m_defValue;
                 // Remove returns
                 // Not removing returns in values has two problems,
@@ -1165,7 +1165,7 @@ int V3PreProcImp::getStateToken() {
                     define(fileline(), m_lastSym, value, formals, false);
                 }
             } else {
-                string msg = string("Bad define text, unexpected ") + tokenName(tok) + "\n";
+                const string msg = string("Bad define text, unexpected ") + tokenName(tok) + "\n";
                 fatalSrc(msg);
             }
             statePop();
@@ -1220,7 +1220,7 @@ int V3PreProcImp::getStateToken() {
                         if (VL_UNCOVERABLE(m_joinStack.empty())) {
                             fatalSrc("`` join stack empty, but in a ``");
                         }
-                        string lhs = m_joinStack.top();
+                        const string lhs = m_joinStack.top();
                         m_joinStack.pop();
                         out.insert(0, lhs);
                         UINFO(5, "``-end-defarg Out:" << out << endl);
@@ -1309,12 +1309,12 @@ int V3PreProcImp::getStateToken() {
                 if (VL_UNCOVERABLE(m_joinStack.empty())) {
                     fatalSrc("`` join stack empty, but in a ``");
                 }
-                string lhs = m_joinStack.top();
+                const string lhs = m_joinStack.top();
                 m_joinStack.pop();
                 UINFO(5, "`` LHS:" << lhs << endl);
                 string rhs(yyourtext(), yyourleng());
                 UINFO(5, "`` RHS:" << rhs << endl);
-                string out = lhs + rhs;
+                const string out = lhs + rhs;
                 UINFO(5, "`` Out:" << out << endl);
                 unputString(out);
                 statePop();
@@ -1323,7 +1323,7 @@ int V3PreProcImp::getStateToken() {
                 // Other compilers just ignore this, so no warning
                 // "Expecting symbol to terminate ``; whitespace etc cannot
                 // follow ``. Found: "+tokenName(tok)+"\n"
-                string lhs = m_joinStack.top();
+                const string lhs = m_joinStack.top();
                 m_joinStack.pop();
                 unputString(lhs);
                 statePop();
@@ -1384,9 +1384,9 @@ int V3PreProcImp::getStateToken() {
             if (m_ifdefStack.empty()) {
                 error("`else with no matching `if\n");
             } else {
-                VPreIfEntry lastIf = m_ifdefStack.top();
+                const VPreIfEntry lastIf = m_ifdefStack.top();
                 m_ifdefStack.pop();
-                bool enable = !lastIf.everOn();
+                const bool enable = !lastIf.everOn();
                 UINFO(4, "Else " << (enable ? " ON" : " OFF") << endl);
                 m_ifdefStack.push(VPreIfEntry(enable, lastIf.everOn()));
                 if (!lastIf.on()) parsingOn();
@@ -1398,7 +1398,7 @@ int V3PreProcImp::getStateToken() {
             if (m_ifdefStack.empty()) {
                 error("`endif with no matching `if\n");
             } else {
-                VPreIfEntry lastIf = m_ifdefStack.top();
+                const VPreIfEntry lastIf = m_ifdefStack.top();
                 m_ifdefStack.pop();
                 if (!lastIf.on()) parsingOn();
                 // parsingOn() really only enables parsing if
@@ -1432,7 +1432,7 @@ int V3PreProcImp::getStateToken() {
                     goto next_tok;
                 }
             } else {
-                string params = defParams(name);
+                const string params = defParams(name);
                 if (params == "0" || params == "") {  // Found, as simple substitution
                     string out;
                     if (!m_off) {
@@ -1447,7 +1447,7 @@ int V3PreProcImp::getStateToken() {
                             if (VL_UNCOVERABLE(m_joinStack.empty())) {
                                 fatalSrc("`` join stack empty, but in a ``");
                             }
-                            string lhs = m_joinStack.top();
+                            const string lhs = m_joinStack.top();
                             m_joinStack.pop();
                             out.insert(0, lhs);
                             UINFO(5, "``-end-defref Out:" << out << endl);
@@ -1533,11 +1533,11 @@ int V3PreProcImp::getFinalToken(string& buf) {
         m_finToken = getStateToken();
         m_finBuf = string(yyourtext(), yyourleng());
     }
-    int tok = m_finToken;
+    const int tok = m_finToken;
     buf = m_finBuf;
     if (false && debug() >= 5) {
-        string bufcln = V3PreLex::cleanDbgStrg(buf);
-        string flcol = m_lexp->m_tokFilelinep->asciiLineCol();
+        const string bufcln = V3PreLex::cleanDbgStrg(buf);
+        const string flcol = m_lexp->m_tokFilelinep->asciiLineCol();
         fprintf(stderr, "%s: FIN:      %-10s: %s\n", flcol.c_str(), tokenName(tok),
                 bufcln.c_str());
     }
@@ -1552,7 +1552,7 @@ int V3PreProcImp::getFinalToken(string& buf) {
             if (int outBehind
                 = (m_lexp->m_tokFilelinep->lastLineno() - m_finFilelinep->lastLineno())) {
                 if (debug() >= 5) {
-                    string flcol = m_lexp->m_tokFilelinep->asciiLineCol();
+                    const string flcol = m_lexp->m_tokFilelinep->asciiLineCol();
                     fprintf(stderr, "%s: FIN: readjust, fin at %d  request at %d\n", flcol.c_str(),
                             m_finFilelinep->lastLineno(), m_lexp->m_tokFilelinep->lastLineno());
                 }
@@ -1594,10 +1594,10 @@ string V3PreProcImp::getline() {
     bool gotEof = false;
     while (nullptr == (rtnp = strchr(m_lineChars.c_str(), '\n')) && !gotEof) {
         string buf;
-        int tok = getFinalToken(buf /*ref*/);
+        const int tok = getFinalToken(buf /*ref*/);
         if (debug() >= 5) {
-            string bufcln = V3PreLex::cleanDbgStrg(buf);
-            string flcol = m_lexp->m_tokFilelinep->asciiLineCol();
+            const string bufcln = V3PreLex::cleanDbgStrg(buf);
+            const string flcol = m_lexp->m_tokFilelinep->asciiLineCol();
             fprintf(stderr, "%s: GETFETC:  %-10s: %s\n", flcol.c_str(), tokenName(tok),
                     bufcln.c_str());
         }
@@ -1613,12 +1613,12 @@ string V3PreProcImp::getline() {
     }
 
     // Make new string with data up to the newline.
-    int len = rtnp - m_lineChars.c_str() + 1;
+    const int len = rtnp - m_lineChars.c_str() + 1;
     string theLine(m_lineChars, 0, len);
     m_lineChars = m_lineChars.erase(0, len);  // Remove returned characters
     if (debug() >= 4) {
-        string lncln = V3PreLex::cleanDbgStrg(theLine);
-        string flcol = m_lexp->m_tokFilelinep->asciiLineCol();
+        const string lncln = V3PreLex::cleanDbgStrg(theLine);
+        const string flcol = m_lexp->m_tokFilelinep->asciiLineCol();
         fprintf(stderr, "%s: GETLINE:  %s\n", flcol.c_str(), lncln.c_str());
     }
     return theLine;
diff --git a/src/V3PreShell.cpp b/src/V3PreShell.cpp
index 2c8bc4ed8..00671044b 100644
--- a/src/V3PreShell.cpp
+++ b/src/V3PreShell.cpp
@@ -95,7 +95,7 @@ protected:
 
         // Preprocess
         s_filterp = filterp;
-        string modfilename = preprocOpen(fl, s_filterp, modname, "", errmsg);
+        const string modfilename = preprocOpen(fl, s_filterp, modname, "", errmsg);
         if (modfilename.empty()) return false;
 
         // Set language standard up front
@@ -112,7 +112,7 @@ protected:
         }
 
         while (!s_preprocp->isEof()) {
-            string line = s_preprocp->getline();
+            const string line = s_preprocp->getline();
             V3Parse::ppPushText(parsep, line);
         }
         return true;
@@ -138,7 +138,7 @@ private:
         if (filename == "") {
             // Allow user to put `defined names on the command line instead of filenames,
             // then convert them properly.
-            string ppmodname = s_preprocp->removeDefines(modname);
+            const string ppmodname = s_preprocp->removeDefines(modname);
 
             filename = v3Global.opt.filePath(fl, ppmodname, lastpath, errmsg);
         }
diff --git a/src/V3Premit.cpp b/src/V3Premit.cpp
index 1f7aaf584..897f25445 100644
--- a/src/V3Premit.cpp
+++ b/src/V3Premit.cpp
@@ -235,7 +235,7 @@ private:
     virtual void visit(AstNodeAssign* nodep) override {
         startStatement(nodep);
         {
-            bool noopt = PremitAssignVisitor(nodep).noOpt();
+            const bool noopt = PremitAssignVisitor(nodep).noOpt();
             if (noopt && !nodep->user1()) {
                 nodep->user1(true);
                 // Need to do this even if not wide, as e.g. a select may be on a wide operator
diff --git a/src/V3Reloop.cpp b/src/V3Reloop.cpp
index 96e6a4dc8..e95239473 100644
--- a/src/V3Reloop.cpp
+++ b/src/V3Reloop.cpp
@@ -70,7 +70,7 @@ private:
     AstVar* findCreateVarTemp(FileLine* fl, AstCFunc* cfuncp) {
         AstVar* varp = VN_CAST(cfuncp->user1p(), Var);
         if (!varp) {
-            string newvarname = string("__Vilp");
+            const string newvarname = string("__Vilp");
             varp = new AstVar(fl, AstVarType::STMTTEMP, newvarname, VFlagLogicPacked(), 32);
             UASSERT_OBJ(cfuncp, fl, "Assignment not under a function");
             cfuncp->addInitsp(varp);
diff --git a/src/V3Scope.cpp b/src/V3Scope.cpp
index 4bde493f2..e90ed7a38 100644
--- a/src/V3Scope.cpp
+++ b/src/V3Scope.cpp
@@ -291,7 +291,7 @@ private:
     }
     virtual void visit(AstScopeName* nodep) override {
         // If there's a %m in the display text, we add a special node that will contain the name()
-        string prefix = string("__DOT__") + m_scopep->name();
+        const string prefix = string("__DOT__") + m_scopep->name();
         // TOP and above will be the user's name().
         // Note 'TOP.' is stripped by scopePrettyName
         // To keep correct visual order, must add before other Text's
diff --git a/src/V3Scoreboard.h b/src/V3Scoreboard.h
index 926453bc3..e4ac0761b 100644
--- a/src/V3Scoreboard.h
+++ b/src/V3Scoreboard.h
@@ -232,7 +232,7 @@ private:
         // removed from the map.
         // Clear the m_vals mapping for k.
         KeySet& keysAtOldVal = m_vals[oldVal];
-        size_t erased = keysAtOldVal.erase(k);
+        const size_t erased = keysAtOldVal.erase(k);
         UASSERT(erased == 1, "removeKeyFromOldVal() removal key not found");
         if (keysAtOldVal.empty()) {
             // Don't keep empty sets in the value map.
@@ -451,7 +451,7 @@ public:
     // and sort all elements by their current score.
     void rescore() {
         for (const T_Elem* elp : m_unknown) {
-            T_Score sortScore = m_scoreFnp(elp);
+            const T_Score sortScore = m_scoreFnp(elp);
             m_sorted.set(elp, sortScore);
         }
         m_unknown.clear();
diff --git a/src/V3Simulate.h b/src/V3Simulate.h
index b992f9292..7907b6bee 100644
--- a/src/V3Simulate.h
+++ b/src/V3Simulate.h
@@ -125,9 +125,9 @@ private:
                 out << "'{";
                 for (AstMemberDType* itemp = stp->membersp(); itemp;
                      itemp = VN_CAST(itemp->nextp(), MemberDType)) {
-                    int width = itemp->width();
-                    int lsb = itemp->lsb();
-                    int msb = lsb + width - 1;
+                    const int width = itemp->width();
+                    const int lsb = itemp->lsb();
+                    const int msb = lsb + width - 1;
                     V3Number fieldNum(nump, width);
                     fieldNum.opSel(*nump, msb, lsb);
                     out << itemp->name() << ": ";
@@ -145,14 +145,14 @@ private:
             if (AstNodeDType* childTypep = arrayp->subDTypep()) {
                 std::ostringstream out;
                 out << "[";
-                int arrayElements = arrayp->elementsConst();
+                const int arrayElements = arrayp->elementsConst();
                 for (int element = 0; element < arrayElements; ++element) {
-                    int width = childTypep->width();
-                    int lsb = width * element;
-                    int msb = lsb + width - 1;
+                    const int width = childTypep->width();
+                    const int lsb = width * element;
+                    const int msb = lsb + width - 1;
                     V3Number fieldNum(nump, width);
                     fieldNum.opSel(*nump, msb, lsb);
-                    int arrayElem = arrayp->lo() + element;
+                    const int arrayElem = arrayp->lo() + element;
                     out << arrayElem << " = " << prettyNumber(&fieldNum, childTypep);
                     if (element < arrayElements - 1) out << ", ";
                 }
@@ -424,7 +424,7 @@ private:
                     clearOptimizable(nodep, "Var write & read");
                 }
                 vscp->user1(vscp->user1() | VU_RV);
-                bool isConst = nodep->varp()->isParam() && nodep->varp()->valuep();
+                const bool isConst = nodep->varp()->isParam() && nodep->varp()->valuep();
                 AstNode* valuep = isConst ? fetchValueNull(nodep->varp()->valuep()) : nullptr;
                 if (isConst
                     && valuep) {  // Propagate PARAM constants for constant function analysis
@@ -1021,7 +1021,7 @@ private:
             AstNode* nextArgp = nodep->exprsp();
 
             string result;
-            string format = nodep->text();
+            const string format = nodep->text();
             auto pos = format.cbegin();
             bool inPct = false;
             for (; pos != format.cend(); ++pos) {
@@ -1041,7 +1041,7 @@ private:
                                 nodep, "Argument for $display like statement is not constant");
                             break;
                         }
-                        string pformat = string("%") + pos[0];
+                        const string pformat = string("%") + pos[0];
                         result += constp->num().displayed(nodep, pformat);
                     } else {
                         switch (tolower(pos[0])) {
diff --git a/src/V3Slice.cpp b/src/V3Slice.cpp
index 21a01f859..695d93082 100644
--- a/src/V3Slice.cpp
+++ b/src/V3Slice.cpp
@@ -86,9 +86,9 @@ class SliceVisitor final : public AstNVisitor {
         AstNode* newp;
         if (AstInitArray* initp = VN_CAST(nodep, InitArray)) {
             UINFO(9, "  cloneInitArray(" << elements << "," << offset << ") " << nodep << endl);
-            int leOffset = !arrayp->rangep()->littleEndian()
-                               ? arrayp->rangep()->elementsConst() - 1 - offset
-                               : offset;
+            const int leOffset = !arrayp->rangep()->littleEndian()
+                                     ? arrayp->rangep()->elementsConst() - 1 - offset
+                                     : offset;
             AstNode* itemp = initp->getIndexDefaultedValuep(leOffset);
             if (!itemp) {
                 nodep->v3error("Array initialization has too few elements, need element "
@@ -103,17 +103,17 @@ class SliceVisitor final : public AstNVisitor {
                                      cloneAndSel(snodep->expr2p(), elements, offset));
         } else if (AstSliceSel* snodep = VN_CAST(nodep, SliceSel)) {
             UINFO(9, "  cloneSliceSel(" << elements << "," << offset << ") " << nodep << endl);
-            int leOffset = (snodep->declRange().lo()
-                            + (!snodep->declRange().littleEndian()
-                                   ? snodep->declRange().elements() - 1 - offset
-                                   : offset));
+            const int leOffset = (snodep->declRange().lo()
+                                  + (!snodep->declRange().littleEndian()
+                                         ? snodep->declRange().elements() - 1 - offset
+                                         : offset));
             newp = new AstArraySel(nodep->fileline(), snodep->fromp()->cloneTree(false), leOffset);
         } else if (VN_IS(nodep, ArraySel) || VN_IS(nodep, NodeVarRef) || VN_IS(nodep, NodeSel)
                    || VN_IS(nodep, CMethodHard) || VN_IS(nodep, MemberSel)) {
             UINFO(9, "  cloneSel(" << elements << "," << offset << ") " << nodep << endl);
-            int leOffset = !arrayp->rangep()->littleEndian()
-                               ? arrayp->rangep()->elementsConst() - 1 - offset
-                               : offset;
+            const int leOffset = !arrayp->rangep()->littleEndian()
+                                     ? arrayp->rangep()->elementsConst() - 1 - offset
+                                     : offset;
             newp = new AstArraySel(nodep->fileline(), nodep->cloneTree(false), leOffset);
         } else {
             if (!m_assignError) {
@@ -138,7 +138,7 @@ class SliceVisitor final : public AstNVisitor {
                 // and all variables are realigned to start at zero
                 // Assign of a little endian'ed slice to a big endian one must reverse the elements
                 AstNode* newlistp = nullptr;
-                int elements = arrayp->rangep()->elementsConst();
+                const int elements = arrayp->rangep()->elementsConst();
                 for (int offset = 0; offset < elements; ++offset) {
                     AstNode* newp = nodep->cloneType  // AstNodeAssign
                                     (cloneAndSel(nodep->lhsp(), elements, offset),
diff --git a/src/V3SplitAs.cpp b/src/V3SplitAs.cpp
index 43f794243..5263a8a9a 100644
--- a/src/V3SplitAs.cpp
+++ b/src/V3SplitAs.cpp
@@ -89,7 +89,7 @@ private:
             return;
         }
         UINFO(6, "     CL STMT " << nodep << endl);
-        bool oldKeep = m_keepStmt;
+        const bool oldKeep = m_keepStmt;
         {
             m_matches = false;
             m_keepStmt = false;
diff --git a/src/V3SplitVar.cpp b/src/V3SplitVar.cpp
index 435d77b46..5a3f8ab78 100644
--- a/src/V3SplitVar.cpp
+++ b/src/V3SplitVar.cpp
@@ -294,7 +294,7 @@ private:
     bool addCore(AstVarRef* refp, const UnpackRef& ref) {
         AstVar* varp = refp->varp();
         UASSERT_OBJ(varp->attrSplitVar(), varp, " no split_var metacomment");
-        MapIt it = m_map.find(varp);
+        const MapIt it = m_map.find(varp);
         if (it == m_map.end()) return false;  // Not registered
         const bool ok = m_map[varp].insert(ref).second;
         return ok;
diff --git a/src/V3Stats.cpp b/src/V3Stats.cpp
index 1f8687bc5..ba11b2f4f 100644
--- a/src/V3Stats.cpp
+++ b/src/V3Stats.cpp
@@ -99,7 +99,7 @@ private:
                 if (v3Global.opt.statsVars()) m_statVarWidthNames.resize(nodep->width() + 5);
             }
             ++m_statVarWidths.at(nodep->width());
-            string pn = nodep->prettyName();
+            const string pn = nodep->prettyName();
             if (v3Global.opt.statsVars()) {
                 NameMap& nameMapr = m_statVarWidthNames.at(nodep->width());
                 if (nameMapr.find(pn) != nameMapr.end()) {
@@ -230,7 +230,7 @@ public:
             V3Stats::addStat(m_stage, "Var space, scoped, bytes", m_statVarScpBytes);
         }
         for (unsigned i = 0; i < m_statVarWidths.size(); i++) {
-            double count = double(m_statVarWidths.at(i));
+            const double count = double(m_statVarWidths.at(i));
             if (count != 0.0) {
                 if (v3Global.opt.statsVars()) {
                     NameMap& nameMapr = m_statVarWidthNames.at(i);
@@ -248,14 +248,14 @@ public:
         }
         // Node types
         for (int type = 0; type < AstType::_ENUM_END; type++) {
-            double count = double(m_statTypeCount.at(type));
+            const double count = double(m_statTypeCount.at(type));
             if (count != 0.0) {
                 V3Stats::addStat(m_stage, string("Node count, ") + AstType(type).ascii(), count);
             }
         }
         for (int type = 0; type < AstType::_ENUM_END; type++) {
             for (int type2 = 0; type2 < AstType::_ENUM_END; type2++) {
-                double count = double(m_statAbove[type][type2]);
+                const double count = double(m_statAbove[type][type2]);
                 if (count != 0.0) {
                     V3Stats::addStat(m_stage,
                                      (string("Node pairs, ") + AstType(type).ascii() + "_"
@@ -266,7 +266,7 @@ public:
         }
         // Branch pred
         for (int type = 0; type < VBranchPred::_ENUM_END; type++) {
-            double count = double(m_statPred[type]);
+            const double count = double(m_statPred[type]);
             if (count != 0.0) {
                 V3Stats::addStat(
                     m_stage, (string("Branch prediction, ") + VBranchPred(type).ascii()), count);
diff --git a/src/V3StatsReport.cpp b/src/V3StatsReport.cpp
index a57aacab2..24c148d3d 100644
--- a/src/V3StatsReport.cpp
+++ b/src/V3StatsReport.cpp
@@ -206,13 +206,13 @@ void V3Stats::statsStage(const string& name) {
 
     const string digitName = V3Global::digitsFilename(++fileNumber) + "_" + name;
 
-    double wallTime = V3Os::timeUsecs() / 1.0e6;
+    const double wallTime = V3Os::timeUsecs() / 1.0e6;
     if (lastWallTime < 0) lastWallTime = wallTime;
-    double wallTimeDelta = wallTime - lastWallTime;
+    const double wallTimeDelta = wallTime - lastWallTime;
     lastWallTime = wallTime;
     V3Stats::addStatPerf("Stage, Elapsed time (sec), " + digitName, wallTimeDelta);
 
-    double memory = V3Os::memUsageBytes() / 1024.0 / 1024.0;
+    const double memory = V3Os::memUsageBytes() / 1024.0 / 1024.0;
     V3Stats::addStatPerf("Stage, Memory (MB), " + digitName, memory);
 }
 
@@ -220,7 +220,8 @@ void V3Stats::statsReport() {
     UINFO(2, __FUNCTION__ << ": " << endl);
 
     // Open stats file
-    string filename = v3Global.opt.hierTopDataDir() + "/" + v3Global.opt.prefix() + "__stats.txt";
+    const string filename
+        = v3Global.opt.hierTopDataDir() + "/" + v3Global.opt.prefix() + "__stats.txt";
     std::ofstream* ofp(V3File::new_ofstream(filename));
     if (ofp->fail()) v3fatal("Can't write " << filename);
 
diff --git a/src/V3String.cpp b/src/V3String.cpp
index d69629394..c4f054575 100644
--- a/src/V3String.cpp
+++ b/src/V3String.cpp
@@ -149,7 +149,7 @@ double VString::parseDouble(const string& str, bool* successp) {
     *dp++ = '\0';
     char* endp = strgp;
     double d = strtod(strgp, &endp);
-    size_t parsed_len = endp - strgp;
+    const size_t parsed_len = endp - strgp;
     if (parsed_len != strlen(strgp)) {
         if (successp) *successp = false;
     }
@@ -406,7 +406,7 @@ string VName::dehash(const string& in) {
     for (string::size_type last_dot_pos = 0; last_dot_pos < in.size();) {
         const string::size_type next_dot_pos = in.find("__DOT__", last_dot_pos);
         // Two iterators defining the range between the last and next dots.
-        auto search_begin = std::begin(in) + last_dot_pos;
+        const auto search_begin = std::begin(in) + last_dot_pos;
         auto search_end
             = next_dot_pos == string::npos ? std::end(in) : std::begin(in) + next_dot_pos;
 
@@ -451,7 +451,7 @@ string VName::hashedName() {
         return m_hashed;
     } else {
         VHashSha256 hash(m_name);
-        string suffix = "__Vhsh" + hash.digestSymbol();
+        const string suffix = "__Vhsh" + hash.digestSymbol();
         if (s_minLength < s_maxLength) {
             s_dehashMap[suffix] = m_name.substr(s_minLength);
             m_hashed = m_name.substr(0, s_minLength) + suffix;
@@ -468,8 +468,8 @@ string VName::hashedName() {
 
 VSpellCheck::EditDistance VSpellCheck::editDistance(const string& s, const string& t) {
     // Wagner-Fischer algorithm for the Damerau-Levenshtein distance
-    size_t sLen = s.length();
-    size_t tLen = t.length();
+    const size_t sLen = s.length();
+    const size_t tLen = t.length();
     if (sLen == 0) return tLen;
     if (tLen == 0) return sLen;
     if (sLen >= LENGTH_LIMIT) return sLen;
@@ -484,14 +484,14 @@ VSpellCheck::EditDistance VSpellCheck::editDistance(const string& s, const strin
     for (size_t i = 0; i < tLen; i++) {
         s_v_next[0] = i + 1;
         for (size_t j = 0; j < sLen; j++) {
-            EditDistance cost = (s[j] == t[i] ? 0 : 1);
-            EditDistance deletion = s_v_next[j] + 1;
-            EditDistance insertion = s_v_one_ago[j + 1] + 1;
-            EditDistance substitution = s_v_one_ago[j] + cost;
+            const EditDistance cost = (s[j] == t[i] ? 0 : 1);
+            const EditDistance deletion = s_v_next[j] + 1;
+            const EditDistance insertion = s_v_one_ago[j + 1] + 1;
+            const EditDistance substitution = s_v_one_ago[j] + cost;
             EditDistance cheapest = std::min(deletion, insertion);
             cheapest = std::min(cheapest, substitution);
             if (i > 0 && j > 0 && s[j] == t[i - 1] && s[j - 1] == t[i]) {
-                EditDistance transposition = s_v_two_ago[j - 1] + 1;
+                const EditDistance transposition = s_v_two_ago[j - 1] + 1;
                 cheapest = std::min(cheapest, transposition);
             }
             s_v_next[j + 1] = cheapest;
@@ -502,14 +502,14 @@ VSpellCheck::EditDistance VSpellCheck::editDistance(const string& s, const strin
         }
     }
 
-    EditDistance result = s_v_next[sLen];
+    const EditDistance result = s_v_next[sLen];
     return result;
 }
 
 VSpellCheck::EditDistance VSpellCheck::cutoffDistance(size_t goal_len, size_t candidate_len) {
     // Return max acceptable edit distance
-    size_t max_length = std::max(goal_len, candidate_len);
-    size_t min_length = std::min(goal_len, candidate_len);
+    const size_t max_length = std::max(goal_len, candidate_len);
+    const size_t min_length = std::min(goal_len, candidate_len);
     if (max_length <= 1) return 0;
     if (max_length - min_length <= 1) return std::max(max_length / 3, static_cast<size_t>(1));
     return (max_length + 2) / 3;
@@ -517,19 +517,19 @@ VSpellCheck::EditDistance VSpellCheck::cutoffDistance(size_t goal_len, size_t ca
 
 string VSpellCheck::bestCandidateInfo(const string& goal, EditDistance& distancer) const {
     string bestCandidate;
-    size_t gLen = goal.length();
+    const size_t gLen = goal.length();
     distancer = LENGTH_LIMIT * 10;
     for (const string& candidate : m_candidates) {
-        size_t cLen = candidate.length();
+        const size_t cLen = candidate.length();
 
         // Min distance must be inserting/deleting to make lengths match
-        EditDistance min_distance = (cLen > gLen ? (cLen - gLen) : (gLen - cLen));
+        const EditDistance min_distance = (cLen > gLen ? (cLen - gLen) : (gLen - cLen));
         if (min_distance >= distancer) continue;  // Short-circuit if already better
 
-        EditDistance cutoff = cutoffDistance(gLen, cLen);
+        const EditDistance cutoff = cutoffDistance(gLen, cLen);
         if (min_distance > cutoff) continue;  // Short-circuit if already too bad
 
-        EditDistance dist = editDistance(goal, candidate);
+        const EditDistance dist = editDistance(goal, candidate);
         UINFO(9, "EditDistance dist=" << dist << " cutoff=" << cutoff << " goal=" << goal
                                       << " candidate=" << candidate << endl);
         if (dist < distancer && dist <= cutoff) {
@@ -553,7 +553,7 @@ void VSpellCheck::selfTestSuggestOne(bool matches, const string& c, const string
     EditDistance gdist;
     VSpellCheck speller;
     speller.pushCandidate(c);
-    string got = speller.bestCandidateInfo(goal, gdist /*ref*/);
+    const string got = speller.bestCandidateInfo(goal, gdist /*ref*/);
     if (matches) {
         UASSERT_SELFTEST(const string&, got, c);
         UASSERT_SELFTEST(EditDistance, gdist, dist);
diff --git a/src/V3String.h b/src/V3String.h
index 1b185ce04..f3ed2f651 100644
--- a/src/V3String.h
+++ b/src/V3String.h
@@ -226,7 +226,7 @@ public:
     }
     // Return friendly message
     string bestCandidateMsg(const string& goal) const {
-        string candidate = bestCandidate(goal);
+        const string candidate = bestCandidate(goal);
         if (candidate.empty()) {
             return "";
         } else {
diff --git a/src/V3Subst.cpp b/src/V3Subst.cpp
index c15d7dd2e..a3c51797e 100644
--- a/src/V3Subst.cpp
+++ b/src/V3Subst.cpp
@@ -276,7 +276,7 @@ private:
         } else if (AstWordSel* wordp = VN_CAST(nodep->lhsp(), WordSel)) {
             if (AstVarRef* varrefp = VN_CAST(wordp->lhsp(), VarRef)) {
                 if (VN_IS(wordp->rhsp(), Const) && isSubstVar(varrefp->varp())) {
-                    int word = VN_CAST(wordp->rhsp(), Const)->toUInt();
+                    const int word = VN_CAST(wordp->rhsp(), Const)->toUInt();
                     SubstVarEntry* entryp = getEntryp(varrefp);
                     hit = true;
                     if (m_ops > SUBST_MAX_OPS_SUBST) {
@@ -309,7 +309,7 @@ private:
         if (varrefp && isSubstVar(varrefp->varp()) && varrefp->access().isReadOnly() && constp) {
             // Nicely formed lvalues handled in NodeAssign
             // Other lvalues handled as unknown mess in AstVarRef
-            int word = constp->toUInt();
+            const int word = constp->toUInt();
             UINFO(8, " USEword" << word << " " << varrefp << endl);
             SubstVarEntry* entryp = getEntryp(varrefp);
             if (AstNode* substp = entryp->substWord(nodep, word)) {
diff --git a/src/V3SymTable.h b/src/V3SymTable.h
index 085b25e71..6db11ae30 100644
--- a/src/V3SymTable.h
+++ b/src/V3SymTable.h
@@ -315,7 +315,7 @@ public:
     }
     void dumpFilePrefixed(const string& nameComment) {
         if (v3Global.opt.dumpTree()) {
-            string filename = v3Global.debugFilename(nameComment) + ".txt";
+            const string filename = v3Global.debugFilename(nameComment) + ".txt";
             UINFO(2, "Dumping " << filename << endl);
             const std::unique_ptr<std::ofstream> logp(V3File::new_ofstream(filename));
             if (logp->fail()) v3fatal("Can't write " << filename);
diff --git a/src/V3TSP.cpp b/src/V3TSP.cpp
index 770c2895b..6e3cc079d 100644
--- a/src/V3TSP.cpp
+++ b/src/V3TSP.cpp
@@ -102,7 +102,7 @@ public:
         // The only time we may create duplicate edges is when
         // combining the MST with the perfect-matched pairs,
         // and in that case, we want to permit duplicate edges.
-        unsigned edgeId = ++V3TSP::edgeIdNext;
+        const unsigned edgeId = ++V3TSP::edgeIdNext;
 
         // Record the 'id' which identifies a single bidir edge
         // in the user field of each V3GraphEdge:
@@ -127,8 +127,8 @@ public:
         EdgeCmp() = default;
         // METHODS
         bool operator()(const V3GraphEdge* ap, const V3GraphEdge* bp) {
-            int aCost = ap->weight();
-            int bCost = bp->weight();
+            const int aCost = ap->weight();
+            const int bCost = bp->weight();
             // Sort first on cost, lowest cost edges first:
             if (aCost < bCost) return true;
             if (bCost < aCost) return false;
@@ -188,7 +188,7 @@ public:
             // to the pending set.
             Vertex* neighborp = castVertexp(bestEdgep->top());
             if (visited_set.find(neighborp) == visited_set.end()) {
-                int bestCost = bestEdgep->weight();
+                const int bestCost = bestEdgep->weight();
                 UINFO(6, "bestCost = " << bestCost << "  from " << from_vertexp->key() << " to "
                                        << neighborp->key() << endl);
 
@@ -354,7 +354,7 @@ public:
     }
     void dumpGraphFilePrefixed(const string& nameComment) const {
         if (v3Global.opt.dumpTree()) {
-            string filename = v3Global.debugFilename(nameComment) + ".txt";
+            const string filename = v3Global.debugFilename(nameComment) + ".txt";
             const std::unique_ptr<std::ofstream> logp(V3File::new_ofstream(filename));
             if (logp->fail()) v3fatal("Can't write " << filename);
             dumpGraph(*logp, nameComment);
@@ -463,7 +463,7 @@ void V3TSP::tspSort(const V3TSP::StateVec& states, V3TSP::StateVec* resultp) {
             const TspStateBase* ap = (*resultp)[i];
             const TspStateBase* bp
                 = (i + 1 == resultp->size()) ? (*resultp)[0] : (*resultp)[i + 1];
-            unsigned cost = ap->cost(bp);
+            const unsigned cost = ap->cost(bp);
             if (cost > max_cost) {
                 max_cost = cost;
                 max_cost_idx = i;
diff --git a/src/V3Task.cpp b/src/V3Task.cpp
index edcfe6a1c..13ab8a148 100644
--- a/src/V3Task.cpp
+++ b/src/V3Task.cpp
@@ -628,7 +628,7 @@ private:
             }
         }
         // First argument is symbol table, then output if a function
-        bool needSyms = !refp->taskp()->dpiImport();
+        const bool needSyms = !refp->taskp()->dpiImport();
         if (needSyms) ccallp->argTypes("vlSymsp");
 
         if (refp->taskp()->dpiContext()) {
@@ -691,7 +691,7 @@ private:
 
     AstNode* createAssignInternalToDpi(AstVar* portp, bool isPtr, const string& frSuffix,
                                        const string& toSuffix) {
-        string stmt = V3Task::assignInternalToDpi(portp, isPtr, frSuffix, toSuffix);
+        const string stmt = V3Task::assignInternalToDpi(portp, isPtr, frSuffix, toSuffix);
         return new AstCStmt(portp->fileline(), stmt);
     }
 
@@ -992,14 +992,14 @@ private:
                         // Ideally we'd make a table of variable
                         // characteristics, and reuse it wherever we can
                         // At least put them into the module's CTOR as static?
-                        string propName = portp->name() + "__Vopenprops";
-                        string propCode = portp->vlPropDecl(propName);
+                        const string propName = portp->name() + "__Vopenprops";
+                        const string propCode = portp->vlPropDecl(propName);
                         cfuncp->addStmtsp(new AstCStmt(portp->fileline(), propCode));
                         //
                         // At runtime we need the svOpenArrayHandle to
                         // point to this task & thread's data, in addition
                         // to static info about the variable
-                        string name = portp->name() + "__Vopenarray";
+                        const string name = portp->name() + "__Vopenarray";
                         string varCode
                             = ("VerilatedDpiOpenVar "
                                // NOLINTNEXTLINE(performance-inefficient-string-concatenation)
@@ -1025,7 +1025,7 @@ private:
 
         // Store context, if needed
         if (nodep->dpiContext()) {
-            string stmt = "Verilated::dpiContext(__Vscopep, __Vfilenamep, __Vlineno);\n";
+            const string stmt = "Verilated::dpiContext(__Vscopep, __Vfilenamep, __Vlineno);\n";
             cfuncp->addStmtsp(new AstCStmt(nodep->fileline(), stmt));
         }
 
@@ -1135,7 +1135,7 @@ private:
         // so make it unique now.
         string suffix;  // So, make them unique
         if (!nodep->taskPublic() && !nodep->classMethod()) suffix = "_" + m_scopep->nameDotless();
-        string name = ((nodep->name() == "new") ? "new" : prefix + nodep->name() + suffix);
+        const string name = ((nodep->name() == "new") ? "new" : prefix + nodep->name() + suffix);
         AstCFunc* cfuncp = new AstCFunc(
             nodep->fileline(), name, m_scopep,
             ((nodep->taskPublic() && rtnvarp) ? rtnvarp->cPubArgType(true, true) : ""));
@@ -1307,8 +1307,8 @@ private:
         UINFO(4, " FTask REF   " << nodep << endl);
         if (debug() >= 9) nodep->dumpTree(cout, "-inlfunc:");
         UASSERT_OBJ(m_scopep, nodep, "func ref not under scope");
-        string namePrefix = ((VN_IS(nodep, FuncRef) ? "__Vfunc_" : "__Vtask_")
-                             + nodep->taskp()->shortName() + "__" + cvtToStr(m_modNCalls++));
+        const string namePrefix = ((VN_IS(nodep, FuncRef) ? "__Vfunc_" : "__Vtask_")
+                                   + nodep->taskp()->shortName() + "__" + cvtToStr(m_modNCalls++));
         // Create output variable
         AstVarScope* outvscp = nullptr;
         if (nodep->taskp()->isFunction()) {
@@ -1621,8 +1621,8 @@ string V3Task::assignInternalToDpi(AstVar* portp, bool isPtr, const string& frSu
     string ket;
     // Someday we'll have better type support, and this can make variables and casts.
     // But for now, we'll just text-bash it.
-    string frName = frPrefix + portp->name() + frSuffix;
-    string toName = portp->name() + toSuffix;
+    const string frName = frPrefix + portp->name() + frSuffix;
+    const string toName = portp->name() + toSuffix;
     size_t unpackSize = 1;  // non-unpacked array is treated as size 1
     int unpackDim = 0;
     if (AstUnpackArrayDType* unpackp = VN_CAST(portp->dtypep()->skipRefp(), UnpackArrayDType)) {
diff --git a/src/V3Trace.cpp b/src/V3Trace.cpp
index 0982fbf79..92ecc8b5b 100644
--- a/src/V3Trace.cpp
+++ b/src/V3Trace.cpp
@@ -640,7 +640,7 @@ private:
                 // If required, create the conditional node checking the activity flags
                 if (!prevActSet || actSet != *prevActSet) {
                     FileLine* const flp = m_topScopep->fileline();
-                    bool always = actSet.count(TraceActivityVertex::ACTIVITY_ALWAYS) != 0;
+                    const bool always = actSet.count(TraceActivityVertex::ACTIVITY_ALWAYS) != 0;
                     AstNode* condp = nullptr;
                     if (always) {
                         condp = new AstConst(flp, 1);  // Always true, will be folded later
diff --git a/src/V3TraceDecl.cpp b/src/V3TraceDecl.cpp
index 05bc8f056..873d66b80 100644
--- a/src/V3TraceDecl.cpp
+++ b/src/V3TraceDecl.cpp
@@ -165,7 +165,7 @@ private:
 
                     const string irpName = irp->prettyName();
                     if (scopeLen > irpName.length()) continue;
-                    string intfScopeName = irpName.substr(0, scopeLen);
+                    const string intfScopeName = irpName.substr(0, scopeLen);
                     if (scopeName != intfScopeName) continue;
                     callCFuncSub(origSubFunc, m_initSubFuncp, irp);
                     ++origSubStmts;
diff --git a/src/V3Tristate.cpp b/src/V3Tristate.cpp
index 1c64911f8..dc85754bb 100644
--- a/src/V3Tristate.cpp
+++ b/src/V3Tristate.cpp
@@ -1138,13 +1138,13 @@ class TristateVisitor final : public TristateBaseVisitor {
             if (debug() >= 9) nodep->dumpTree(cout, "-pin-pre: ");
 
             // Empty/in-only; need Z to propagate
-            bool inDeclProcessing = (nodep->exprp()
-                                     && nodep->modVarp()->direction() == VDirection::INPUT
-                                     // Need to consider the original state
-                                     // instead of current state as we converted
-                                     // tristates to inputs, which do not want
-                                     // to have this.
-                                     && !nodep->modVarp()->declDirection().isWritable());
+            const bool inDeclProcessing = (nodep->exprp()
+                                           && nodep->modVarp()->direction() == VDirection::INPUT
+                                           // Need to consider the original state
+                                           // instead of current state as we converted
+                                           // tristates to inputs, which do not want
+                                           // to have this.
+                                           && !nodep->modVarp()->declDirection().isWritable());
             if (!nodep->exprp()) {  // No-connect; covert to empty connection
                 UINFO(5, "Unconnected pin terminate " << nodep << endl);
                 AstVar* ucVarp = getCreateUnconnVarp(nodep, nodep->modVarp()->dtypep());
diff --git a/src/V3Undriven.cpp b/src/V3Undriven.cpp
index e9185aac8..4f8f4bcb4 100644
--- a/src/V3Undriven.cpp
+++ b/src/V3Undriven.cpp
@@ -87,7 +87,7 @@ private:
                 }
             } else if (prev) {
                 AstBasicDType* bdtypep = m_varp->basicp();
-                int lsb = bit + 1;
+                const int lsb = bit + 1;
                 if (bits != "") bits += ",";
                 if (lsb == msb) {
                     bits += cvtToStr(lsb + bdtypep->lo());
@@ -141,9 +141,9 @@ public:
         return isUsedNotDrivenBit(0, m_bitFlags.size() / FLAGS_PER_BIT);
     }
     bool unusedMatch(AstVar* nodep) {
-        string regexp = v3Global.opt.unusedRegexp();
+        const string regexp = v3Global.opt.unusedRegexp();
         if (regexp == "") return false;
-        string prettyName = nodep->prettyName();
+        const string prettyName = nodep->prettyName();
         return VString::wildmatch(prettyName.c_str(), regexp.c_str());
     }
     void reportViolations() {
@@ -158,8 +158,8 @@ public:
             bool anyDnotU = false;
             bool anynotDU = false;
             for (unsigned bit = 0; bit < m_bitFlags.size() / FLAGS_PER_BIT; bit++) {
-                bool used = usedFlag(bit);
-                bool driv = drivenFlag(bit);
+                const bool used = usedFlag(bit);
+                const bool driv = drivenFlag(bit);
                 allU &= used;
                 anyU |= used;
                 allD &= driv;
@@ -326,7 +326,7 @@ private:
         if (varrefp && constp && !constp->num().isFourState()) {
             for (int usr = 1; usr < (m_alwaysCombp ? 3 : 2); ++usr) {
                 UndrivenVarEntry* entryp = getEntryp(varrefp->varp(), usr);
-                int lsb = constp->toUInt();
+                const int lsb = constp->toUInt();
                 if (m_inBBox || varrefp->access().isWriteOrRW()) {
                     // Don't warn if already driven earlier as "a=0; if(a) a=1;" is fine.
                     if (usr == 2 && m_alwaysCombp
@@ -365,8 +365,8 @@ private:
         }
         for (int usr = 1; usr < (m_alwaysCombp ? 3 : 2); ++usr) {
             UndrivenVarEntry* entryp = getEntryp(nodep->varp(), usr);
-            bool fdrv = nodep->access().isWriteOrRW()
-                        && nodep->varp()->attrFileDescr();  // FD's are also being read from
+            const bool fdrv = nodep->access().isWriteOrRW()
+                              && nodep->varp()->attrFileDescr();  // FD's are also being read from
             if (m_inBBox || nodep->access().isWriteOrRW()) {
                 if (usr == 2 && m_alwaysCombp && entryp->isUsedNotDrivenAny()) {
                     UINFO(9, " Full bus.  Entryp=" << cvtToHex(entryp) << endl);
diff --git a/src/V3Unknown.cpp b/src/V3Unknown.cpp
index e79db26eb..fb0d89866 100644
--- a/src/V3Unknown.cpp
+++ b/src/V3Unknown.cpp
@@ -84,7 +84,7 @@ private:
             m_assignwp->convertToAlways();
             VL_DO_CLEAR(pushDeletep(m_assignwp), m_assignwp = nullptr);
         }
-        bool needDly = (m_assigndlyp != nullptr);
+        const bool needDly = (m_assigndlyp != nullptr);
         if (m_assigndlyp) {
             // Delayed assignments become normal assignments,
             // then the temp created becomes the delayed assignment
@@ -113,7 +113,7 @@ private:
             UINFO(4, "Edit BOUNDLVALUE " << newp << endl);
             replaceHandle.relink(newp);
         } else {
-            string name = (string("__Vlvbound") + cvtToStr(m_modp->varNumGetInc()));
+            const string name = (string("__Vlvbound") + cvtToStr(m_modp->varNumGetInc()));
             AstVar* varp = new AstVar(fl, AstVarType::MODULETEMP, name, prep->dtypep());
             m_modp->addStmtp(varp);
 
@@ -322,7 +322,7 @@ private:
                 // Make a Vxrand variable
                 // We use the special XTEMP type so it doesn't break pure functions
                 UASSERT_OBJ(m_modp, nodep, "X number not under module");
-                string newvarname = (string("__Vxrand") + cvtToStr(m_modp->varNumGetInc()));
+                const string newvarname = (string("__Vxrand") + cvtToStr(m_modp->varNumGetInc()));
                 AstVar* newvarp = new AstVar(nodep->fileline(), AstVarType::XTEMP, newvarname,
                                              VFlagLogicPacked(), nodep->width());
                 ++m_statUnkVars;
@@ -365,7 +365,7 @@ private:
             }
             // Find range of dtype we are selecting from
             // Similar code in V3Const::warnSelect
-            int maxmsb = nodep->fromp()->dtypep()->width() - 1;
+            const int maxmsb = nodep->fromp()->dtypep()->width() - 1;
             if (debug() >= 9) nodep->dumpTree(cout, "sel_old: ");
 
             // If (maxmsb >= selected), we're in bound
diff --git a/src/V3Unroll.cpp b/src/V3Unroll.cpp
index 57c49c552..ae5640258 100644
--- a/src/V3Unroll.cpp
+++ b/src/V3Unroll.cpp
@@ -324,8 +324,8 @@ private:
                         VL_DO_DANGLING(tempp->deleteTree(), tempp);
                     }
                     if (m_generate) {
-                        string index = AstNode::encodeNumber(m_varValuep->toSInt());
-                        string nname = m_beginName + "__BRA__" + index + "__KET__";
+                        const string index = AstNode::encodeNumber(m_varValuep->toSInt());
+                        const string nname = m_beginName + "__BRA__" + index + "__KET__";
                         oneloopp = new AstBegin(oneloopp->fileline(), nname, oneloopp, true);
                     }
                     VL_DO_CLEAR(pushDeletep(m_varValuep), m_varValuep = nullptr);
diff --git a/src/V3Width.cpp b/src/V3Width.cpp
index 08204e1d0..5f67404e4 100644
--- a/src/V3Width.cpp
+++ b/src/V3Width.cpp
@@ -467,9 +467,10 @@ private:
             } else if (nodep->expr1p()->isString() || nodep->expr2p()->isString()) {
                 nodep->dtypeSetString();
             } else {
-                int width = std::max(nodep->expr1p()->width(), nodep->expr2p()->width());
-                int mwidth = std::max(nodep->expr1p()->widthMin(), nodep->expr2p()->widthMin());
-                bool issigned = nodep->expr1p()->isSigned() && nodep->expr2p()->isSigned();
+                const int width = std::max(nodep->expr1p()->width(), nodep->expr2p()->width());
+                const int mwidth
+                    = std::max(nodep->expr1p()->widthMin(), nodep->expr2p()->widthMin());
+                const bool issigned = nodep->expr1p()->isSigned() && nodep->expr2p()->isSigned();
                 nodep->dtypeSetLogicUnsized(width, mwidth, VSigning::fromBool(issigned));
             }
         }
@@ -757,7 +758,7 @@ private:
         checkConstantOrReplace(nodep->rightp(), "right side of bit range isn't a constant");
         if (m_vup->prelim()) {
             // Don't need to iterate because V3Const already constified
-            int width = nodep->elementsConst();
+            const int width = nodep->elementsConst();
             if (width > (1 << 28)) {
                 nodep->v3error("Width of bit range is huge; vector of over 1billion bits: 0x"
                                << std::hex << width);
@@ -818,7 +819,7 @@ private:
             // variable[15:15] and 5 bits for [15:-2]
             int frommsb = nodep->fromp()->width() - 1;
             int fromlsb = 0;
-            int elw = nodep->declElWidth();  // Must adjust to tell user bit ranges
+            const int elw = nodep->declElWidth();  // Must adjust to tell user bit ranges
             if (nodep->declRange().ranged()) {
                 frommsb = nodep->declRange().hiMaxSelect() * elw
                           + (elw - 1);  // Corrected for negative lsb
@@ -826,7 +827,7 @@ private:
             } else {
                 // nodep->v3fatalSrc("Should have been declRanged in V3WidthSel");
             }
-            int selwidth = V3Number::log2b(frommsb + 1 - 1) + 1;  // Width to address a bit
+            const int selwidth = V3Number::log2b(frommsb + 1 - 1) + 1;  // Width to address a bit
             AstNodeDType* selwidthDTypep
                 = nodep->findLogicDType(selwidth, selwidth, nodep->lsbp()->dtypep()->numeric());
             userIterateAndNext(nodep->fromp(), WidthVP(SELF, FINAL).p());
@@ -907,7 +908,7 @@ private:
                 nodep->v3fatalSrc("Array reference exceeds dimension of array");
                 frommsb = fromlsb = 0;
             }
-            int selwidth = V3Number::log2b(frommsb + 1 - 1) + 1;  // Width to address a bit
+            const int selwidth = V3Number::log2b(frommsb + 1 - 1) + 1;  // Width to address a bit
             AstNodeDType* selwidthDTypep
                 = nodep->findLogicDType(selwidth, selwidth, nodep->bitp()->dtypep()->numeric());
             if (widthBad(nodep->bitp(), selwidthDTypep) && nodep->bitp()->width() != 32) {
@@ -1270,7 +1271,7 @@ private:
             iterateCheckSizedSelf(nodep, "THS", nodep->thsp(), SELF, BOTH);
             iterateCheckSizedSelf(nodep, "FHS", nodep->fhsp(), SELF, BOTH);
             // If it's a 32 bit number, we need a 6 bit number as we need to return '32'.
-            int selwidth = V3Number::log2b(nodep->lhsp()->width()) + 1;
+            const int selwidth = V3Number::log2b(nodep->lhsp()->width()) + 1;
             nodep->dtypeSetLogicSized(selwidth,
                                       VSigning::UNSIGNED);  // Spec doesn't indicate if an integer
         }
@@ -1279,7 +1280,7 @@ private:
         if (m_vup->prelim()) {
             iterateCheckSizedSelf(nodep, "LHS", nodep->lhsp(), SELF, BOTH);
             // If it's a 32 bit number, we need a 6 bit number as we need to return '32'.
-            int selwidth = V3Number::log2b(nodep->lhsp()->width()) + 1;
+            const int selwidth = V3Number::log2b(nodep->lhsp()->width()) + 1;
             nodep->dtypeSetLogicSized(selwidth,
                                       VSigning::UNSIGNED);  // Spec doesn't indicate if an integer
         }
@@ -1327,9 +1328,9 @@ private:
         case AstAttrType::DIM_UNPK_DIMENSIONS: {
             UASSERT_OBJ(nodep->fromp() && nodep->fromp()->dtypep(), nodep, "Unsized expression");
             std::pair<uint32_t, uint32_t> dim = nodep->fromp()->dtypep()->dimensions(true);
-            int val = (nodep->attrType() == AstAttrType::DIM_UNPK_DIMENSIONS
-                           ? dim.second
-                           : (dim.first + dim.second));
+            const int val = (nodep->attrType() == AstAttrType::DIM_UNPK_DIMENSIONS
+                                 ? dim.second
+                                 : (dim.first + dim.second));
             nodep->replaceWith(new AstConst(nodep->fileline(), AstConst::Signed32(), val));
             VL_DO_DANGLING(nodep->deleteTree(), nodep);
             break;
@@ -1392,13 +1393,13 @@ private:
                     = nodep->fromp()->dtypep()->skipRefp()->dimensions(true);
                 uint32_t msbdim = dimpair.first + dimpair.second;
                 if (!nodep->dimp() || msbdim < 1) {
-                    int dim = 1;
+                    const int dim = 1;
                     AstConst* newp = dimensionValue(nodep->fileline(), nodep->fromp()->dtypep(),
                                                     nodep->attrType(), dim);
                     nodep->replaceWith(newp);
                     VL_DO_DANGLING(nodep->deleteTree(), nodep);
                 } else if (VN_IS(nodep->dimp(), Const)) {
-                    int dim = VN_CAST(nodep->dimp(), Const)->toSInt();
+                    const int dim = VN_CAST(nodep->dimp(), Const)->toSInt();
                     AstConst* newp = dimensionValue(nodep->fileline(), nodep->fromp()->dtypep(),
                                                     nodep->attrType(), dim);
                     nodep->replaceWith(newp);
@@ -1420,7 +1421,7 @@ private:
         }
         case AstAttrType::TYPENAME: {
             UASSERT_OBJ(nodep->fromp(), nodep, "Unprovided expression");
-            string result = nodep->fromp()->dtypep()->prettyDTypeName();
+            const string result = nodep->fromp()->dtypep()->prettyDTypeName();
             AstNode* newp = new AstConst(nodep->fileline(), AstConst::String(), result);
             nodep->replaceWith(newp);
             VL_DO_DANGLING(nodep->deleteTree(), nodep);
@@ -1470,7 +1471,7 @@ private:
             nodep->widthFromSub(nodep->subDTypep());
             if (nodep->subDTypep()->skipRefp()->isCompound()) adtypep->isCompound(true);
         } else {
-            int width = nodep->subDTypep()->width() * nodep->rangep()->elementsConst();
+            const int width = nodep->subDTypep()->width() * nodep->rangep()->elementsConst();
             nodep->widthForce(width, width);
         }
         UINFO(4, "dtWidthed " << nodep << endl);
@@ -1653,7 +1654,7 @@ private:
             auto* enumDtp = VN_CAST(toDtp, EnumDType);
             UASSERT_OBJ(enumDtp, nodep, "$cast determined as enum, but not enum type");
             uint64_t maxval = enumMaxValue(nodep, enumDtp);
-            int selwidth = V3Number::log2b(maxval) + 1;  // Width to address a bit
+            const int selwidth = V3Number::log2b(maxval) + 1;  // Width to address a bit
             AstVar* varp = enumVarp(enumDtp, AstAttrType::ENUM_VALID, (1ULL << selwidth) - 1);
             AstVarRef* varrefp = new AstVarRef(fl, varp, VAccess::READ);
             varrefp->classOrPackagep(v3Global.rootp()->dollarUnitPkgAddp());
@@ -1755,7 +1756,7 @@ private:
             if (bad) {
             } else if (AstBasicDType* basicp = toDtp->basicp()) {
                 if (!basicp->isDouble() && !fromDtp->isDouble()) {
-                    int width = toDtp->width();
+                    const int width = toDtp->width();
                     castSized(nodep, nodep->fromp(), width);
                     // Note castSized might modify nodep->fromp()
                 } else {
@@ -1840,7 +1841,7 @@ private:
         // However the output width is exactly that requested.
         // So two steps, first do the calculation's width (max of the two widths)
         {
-            int calcWidth = std::max(width, underDtp->width());
+            const int calcWidth = std::max(width, underDtp->width());
             AstNodeDType* calcDtp
                 = (underDtp->isFourstate()
                        ? nodep->findLogicDType(calcWidth, calcWidth, underDtp->numeric())
@@ -1895,7 +1896,7 @@ private:
         // Parameters if implicit untyped inherit from what they are assigned to
         AstBasicDType* bdtypep = VN_CAST(nodep->dtypep(), BasicDType);
         bool didchk = false;
-        bool implicitParam = nodep->isParam() && bdtypep && bdtypep->implicit();
+        const bool implicitParam = nodep->isParam() && bdtypep && bdtypep->implicit();
         if (implicitParam) {
             if (nodep->valuep()) {
                 userIterateAndNext(nodep->valuep(), WidthVP(nodep->dtypep(), PRELIM).p());
@@ -2403,7 +2404,7 @@ private:
             }
             classp = classp->extendsp() ? classp->extendsp()->classp() : nullptr;
         }
-        string suggest = speller.bestCandidateMsg(nodep->prettyName());
+        const string suggest = speller.bestCandidateMsg(nodep->prettyName());
         nodep->v3error(
             "Member " << nodep->prettyNameQ() << " not found in class "
                       << first_classp->prettyNameQ() << "\n"
@@ -2509,7 +2510,7 @@ private:
             ++narg;
             UASSERT_OBJ(VN_IS(argp, Arg), nodep, "Method arg without Arg type");
         }
-        bool ok = (narg >= minArg) && (narg <= maxArg);
+        const bool ok = (narg >= minArg) && (narg <= maxArg);
         if (!ok) {
             nodep->v3error("The " << narg << " arguments passed to ." << nodep->prettyName()
                                   << " method does not match its requiring " << cvtToStr(minArg)
@@ -2601,7 +2602,7 @@ private:
             }
             // Need a runtime lookup table.  Yuk.
             uint64_t msbdim = enumMaxValue(nodep, adtypep);
-            int selwidth = V3Number::log2b(msbdim) + 1;  // Width to address a bit
+            const int selwidth = V3Number::log2b(msbdim) + 1;  // Width to address a bit
             AstVar* varp = enumVarp(adtypep, attrType, (1ULL << selwidth) - 1);
             AstVarRef* varrefp = new AstVarRef(nodep->fileline(), varp, VAccess::READ);
             varrefp->classOrPackagep(v3Global.rootp()->dollarUnitPkgAddp());
@@ -3000,7 +3001,7 @@ private:
                 }
                 classp = classp->extendsp() ? classp->extendsp()->classp() : nullptr;
             }
-            string suggest = speller.bestCandidateMsg(nodep->prettyName());
+            const string suggest = speller.bestCandidateMsg(nodep->prettyName());
             nodep->v3error("Class method "
                            << nodep->prettyNameQ() << " not found in class "
                            << first_classp->prettyNameQ() << "\n"
@@ -3272,7 +3273,7 @@ private:
             // widths need to be individually determined
             for (AstPatMember* patp = VN_CAST(nodep->itemsp(), PatMember); patp;
                  patp = VN_CAST(patp->nextp(), PatMember)) {
-                int times = visitPatMemberRep(patp);
+                const int times = visitPatMemberRep(patp);
                 for (int i = 1; i < times; i++) {
                     AstNode* newp = patp->cloneTree(false);
                     patp->addNextHere(newp);
@@ -3428,7 +3429,7 @@ private:
         VL_DO_DANGLING(pushDeletep(nodep), nodep);  // Deletes defaultp also, if present
     }
     void patternArray(AstPattern* nodep, AstNodeArrayDType* arrayDtp, AstPatMember* defaultp) {
-        VNumRange range = arrayDtp->declRange();
+        const VNumRange range = arrayDtp->declRange();
         PatVecMap patmap = patVectorMap(nodep, range);
         UINFO(9, "ent " << range.left() << " to " << range.right() << endl);
         AstNode* newp = nullptr;
@@ -3533,7 +3534,7 @@ private:
     }
     void patternBasic(AstPattern* nodep, AstNodeDType* vdtypep, AstPatMember* defaultp) {
         AstBasicDType* bdtypep = VN_CAST(vdtypep, BasicDType);
-        VNumRange range = bdtypep->declRange();
+        const VNumRange range = bdtypep->declRange();
         PatVecMap patmap = patVectorMap(nodep, range);
         UINFO(9, "ent " << range.hi() << " to " << range.lo() << endl);
         AstNode* newp = nullptr;
@@ -3670,9 +3671,9 @@ private:
                     if (condp->dtypep()->isDouble()) {
                         subDTypep = nodep->findDoubleDType();
                     } else {
-                        int width = std::max(subDTypep->width(), condp->width());
-                        int mwidth = std::max(subDTypep->widthMin(), condp->widthMin());
-                        bool issigned = subDTypep->isSigned() && condp->isSigned();
+                        const int width = std::max(subDTypep->width(), condp->width());
+                        const int mwidth = std::max(subDTypep->widthMin(), condp->widthMin());
+                        const bool issigned = subDTypep->isSigned() && condp->isSigned();
                         subDTypep
                             = nodep->findLogicDType(width, mwidth, VSigning::fromBool(issigned));
                     }
@@ -3789,7 +3790,7 @@ private:
         string newFormat;
         bool inPct = false;
         AstNode* argp = nodep->exprsp();
-        string txt = nodep->text();
+        const string txt = nodep->text();
         string fmt;
         for (char ch : txt) {
             if (!inPct && ch == '%') {
@@ -4145,13 +4146,13 @@ private:
             modDTypep = modDTypep->skipRefp();
             conDTypep = conDTypep->skipRefp();
             AstNodeDType* subDTypep = modDTypep;
-            int pinwidth = modDTypep->width();
-            int conwidth = conDTypep->width();
+            const int pinwidth = modDTypep->width();
+            const int conwidth = conDTypep->width();
             if (conDTypep == modDTypep  // If match, we're golden
                 || similarDTypeRecurse(conDTypep, modDTypep)) {
                 userIterateAndNext(nodep->exprp(), WidthVP(subDTypep, FINAL).p());
             } else if (m_cellp->rangep()) {
-                int numInsts = m_cellp->rangep()->elementsConst();
+                const int numInsts = m_cellp->rangep()->elementsConst();
                 if (conwidth == pinwidth) {
                     // Arrayed instants: widths match so connect to each instance
                     subDTypep = conDTypep;  // = same expr dtype
@@ -4216,8 +4217,8 @@ private:
                 AstNodeArrayDType* modArrayp = VN_CAST(modDTypep, UnpackArrayDType);
                 if (exprArrayp && modArrayp && VN_IS(exprArrayp->subDTypep(), IfaceRefDType)
                     && exprArrayp->declRange().elements() != modArrayp->declRange().elements()) {
-                    int exprSize = exprArrayp->declRange().elements();
-                    int modSize = modArrayp->declRange().elements();
+                    const int exprSize = exprArrayp->declRange().elements();
+                    const int modSize = modArrayp->declRange().elements();
                     nodep->v3error("Illegal "
                                    << nodep->prettyOperatorName() << ","
                                    << " mismatch between port which is an interface array of size "
@@ -4265,9 +4266,9 @@ private:
             nodep->dtypeFrom(nodep->rangep());
             // Very much like like an pin
             AstNodeDType* conDTypep = nodep->exprp()->dtypep();
-            int numInsts = nodep->rangep()->elementsConst();
-            int pinwidth = numInsts;
-            int conwidth = conDTypep->width();
+            const int numInsts = nodep->rangep()->elementsConst();
+            const int pinwidth = numInsts;
+            const int conwidth = conDTypep->width();
             if (conwidth == 1 && pinwidth > 1) {  // Multiple connections
                 AstNodeDType* subDTypep = nodep->findLogicDType(1, 1, conDTypep->numeric());
                 userIterateAndNext(nodep->exprp(), WidthVP(subDTypep, FINAL).p());
@@ -4714,13 +4715,13 @@ private:
                     iterateCheckString(nodep, "RHS", nodep->rhsp(), FINAL);
                 }
             } else {
-                bool signedFl = nodep->lhsp()->isSigned() && nodep->rhsp()->isSigned();
+                const bool signedFl = nodep->lhsp()->isSigned() && nodep->rhsp()->isSigned();
                 if (AstNodeBiop* newp = replaceWithUOrSVersion(nodep, signedFl)) {
                     VL_DANGLING(nodep);
                     nodep = newp;  // Process new node instead
                 }
-                int width = std::max(nodep->lhsp()->width(), nodep->rhsp()->width());
-                int ewidth = std::max(nodep->lhsp()->widthMin(), nodep->rhsp()->widthMin());
+                const int width = std::max(nodep->lhsp()->width(), nodep->rhsp()->width());
+                const int ewidth = std::max(nodep->lhsp()->widthMin(), nodep->rhsp()->widthMin());
                 AstNodeDType* subDTypep
                     = nodep->findLogicDType(width, ewidth, VSigning::fromBool(signedFl));
                 bool warnOn = true;
@@ -4828,7 +4829,7 @@ private:
         if (m_vup->prelim()) {
             userIterateAndNext(nodep->lhsp(), WidthVP(SELF, PRELIM).p());
             checkCvtUS(nodep->lhsp());
-            int width = nodep->lhsp()->width();
+            const int width = nodep->lhsp()->width();
             AstNodeDType* expDTypep = nodep->findLogicDType(width, width, rs_out);
             nodep->dtypep(expDTypep);
             AstNodeDType* subDTypep = expDTypep;
@@ -4909,9 +4910,9 @@ private:
             userIterateAndNext(nodep->rhsp(), WidthVP(CONTEXT, PRELIM).p());
             checkCvtUS(nodep->lhsp());
             checkCvtUS(nodep->rhsp());
-            int width = std::max(nodep->lhsp()->width(), nodep->rhsp()->width());
-            int mwidth = std::max(nodep->lhsp()->widthMin(), nodep->rhsp()->widthMin());
-            bool expSigned = (nodep->lhsp()->isSigned() && nodep->rhsp()->isSigned());
+            const int width = std::max(nodep->lhsp()->width(), nodep->rhsp()->width());
+            const int mwidth = std::max(nodep->lhsp()->widthMin(), nodep->rhsp()->widthMin());
+            const bool expSigned = (nodep->lhsp()->isSigned() && nodep->rhsp()->isSigned());
             nodep->dtypeChgWidthSigned(width, mwidth, VSigning::fromBool(expSigned));
         }
         if (m_vup->final()) {
@@ -4957,9 +4958,9 @@ private:
                 iterateCheckReal(nodep, "RHS", nodep->rhsp(), FINAL);
                 return;
             } else {
-                int width = std::max(nodep->lhsp()->width(), nodep->rhsp()->width());
-                int mwidth = std::max(nodep->lhsp()->widthMin(), nodep->rhsp()->widthMin());
-                bool expSigned = (nodep->lhsp()->isSigned() && nodep->rhsp()->isSigned());
+                const int width = std::max(nodep->lhsp()->width(), nodep->rhsp()->width());
+                const int mwidth = std::max(nodep->lhsp()->widthMin(), nodep->rhsp()->widthMin());
+                const bool expSigned = (nodep->lhsp()->isSigned() && nodep->rhsp()->isSigned());
                 nodep->dtypeChgWidthSigned(width, mwidth, VSigning::fromBool(expSigned));
             }
         }
@@ -5016,7 +5017,7 @@ private:
     // LOWER LEVEL WIDTH METHODS  (none iterate)
 
     bool widthBad(AstNode* nodep, AstNodeDType* expDTypep) {
-        int expWidth = expDTypep->width();
+        const int expWidth = expDTypep->width();
         int expWidthMin = expDTypep->widthMin();
         UASSERT_OBJ(nodep->dtypep(), nodep,
                     "Under node " << nodep->prettyTypeName()
@@ -5048,7 +5049,7 @@ private:
         UINFO(4, "  widthExtend_(r=" << extendRule << ") old: " << nodep << endl);
         if (extendRule == EXTEND_OFF) return;
         AstConst* constp = VN_CAST(nodep, Const);
-        int expWidth = expDTypep->width();
+        const int expWidth = expDTypep->width();
         if (constp && !constp->num().isNegative()) {
             // Save later constant propagation work, just right-size it.
             V3Number num(nodep, expWidth);
@@ -5100,8 +5101,8 @@ private:
         // IF (A(CONSTwide)) becomes  IF (A(CONSTreduced))
         // IF (A(somewide))  becomes  IF (A(REDOR(somewide)))
         // Attempt to fix it quietly
-        int expWidth = 1;
-        int expSigned = false;
+        const int expWidth = 1;
+        const int expSigned = false;
         UINFO(4, "  widthReduce_old: " << nodep << endl);
         AstConst* constp = VN_CAST(nodep, Const);
         if (constp) {
@@ -5287,7 +5288,7 @@ private:
             underp->replaceWith(new AstConst(nodep->fileline(), AstConst::BitFalse()));
             VL_DO_DANGLING(pushDeletep(underp), underp);
         } else {
-            bool bad = widthBad(underp, nodep->findBitDType());
+            const bool bad = widthBad(underp, nodep->findBitDType());
             if (bad) {
                 {  // if (warnOn), but not needed here
                     if (debug() > 4) nodep->backp()->dumpTree(cout, "  back: ");
@@ -5401,10 +5402,10 @@ private:
 #endif
             return;
         } else {
-            int expWidth = expDTypep->width();
+            const int expWidth = expDTypep->width();
             int expWidthMin = expDTypep->widthMin();
             if (expWidthMin == 0) expWidthMin = expWidth;
-            bool bad = widthBad(underp, expDTypep);
+            const bool bad = widthBad(underp, expDTypep);
             if ((bad || underp->width() != expWidth) && fixAutoExtend(underp /*ref*/, expWidth)) {
                 underp = nullptr;  // Changes underp
                 return;
@@ -6003,7 +6004,7 @@ private:
     }
     static Castable computeCastableImp(AstNodeDType* toDtp, AstNodeDType* fromDtp,
                                        AstNode* fromConstp) {
-        Castable castable = UNSUPPORTED;
+        const Castable castable = UNSUPPORTED;
         toDtp = toDtp->skipRefToEnump();
         fromDtp = fromDtp->skipRefToEnump();
         if (toDtp == fromDtp) return COMPATIBLE;
@@ -6014,8 +6015,9 @@ private:
                 fromBaseDtp = refp->refDTypep();
             }
         }
-        bool fromNumericable = VN_IS(fromBaseDtp, BasicDType) || VN_IS(fromBaseDtp, EnumDType)
-                               || VN_IS(fromBaseDtp, NodeUOrStructDType);
+        const bool fromNumericable = VN_IS(fromBaseDtp, BasicDType)
+                                     || VN_IS(fromBaseDtp, EnumDType)
+                                     || VN_IS(fromBaseDtp, NodeUOrStructDType);
         // UNSUP unpacked struct/unions (treated like BasicDType)
         if (VN_IS(toDtp, BasicDType) || VN_IS(toDtp, NodeUOrStructDType)) {
             if (fromNumericable) return COMPATIBLE;
@@ -6027,8 +6029,8 @@ private:
         } else if (VN_IS(toDtp, ClassRefDType) && VN_IS(fromDtp, ClassRefDType)) {
             const auto toClassp = VN_CAST(toDtp, ClassRefDType)->classp();
             const auto fromClassp = VN_CAST(fromDtp, ClassRefDType)->classp();
-            bool downcast = AstClass::isClassExtendedFrom(toClassp, fromClassp);
-            bool upcast = AstClass::isClassExtendedFrom(fromClassp, toClassp);
+            const bool downcast = AstClass::isClassExtendedFrom(toClassp, fromClassp);
+            const bool upcast = AstClass::isClassExtendedFrom(fromClassp, toClassp);
             if (upcast) {
                 return COMPATIBLE;
             } else if (downcast) {
diff --git a/src/V3WidthCommit.h b/src/V3WidthCommit.h
index 1892ac2d0..7aeeeb416 100644
--- a/src/V3WidthCommit.h
+++ b/src/V3WidthCommit.h
@@ -129,7 +129,7 @@ private:
             nodep->v3fatalSrc("ref to unhandled definition type " << defp->prettyTypeName());
         }
         if (local || prot) {
-            auto refClassp = VN_CAST(m_modp, Class);
+            const auto refClassp = VN_CAST(m_modp, Class);
             const char* how = nullptr;
             if (local && defClassp && refClassp != defClassp) {
                 how = "'local'";
diff --git a/src/V3WidthSel.cpp b/src/V3WidthSel.cpp
index 665e5d543..c1e77fd74 100644
--- a/src/V3WidthSel.cpp
+++ b/src/V3WidthSel.cpp
@@ -207,9 +207,9 @@ private:
         AstNode* fromp = nodep->fromp()->unlinkFrBack();
         AstNode* rhsp = nodep->rhsp()->unlinkFrBack();  // bit we're extracting
         if (debug() >= 9) nodep->dumpTree(cout, "--SELBT2: ");
-        FromData fromdata = fromDataForArray(nodep, fromp);
+        const FromData fromdata = fromDataForArray(nodep, fromp);
         AstNodeDType* ddtypep = fromdata.m_dtypep;
-        VNumRange fromRange = fromdata.m_fromRange;
+        const VNumRange fromRange = fromdata.m_fromRange;
         UINFO(6, "  ddtypep " << ddtypep << endl);
         if (AstUnpackArrayDType* adtypep = VN_CAST(ddtypep, UnpackArrayDType)) {
             // SELBIT(array, index) -> ARRAYSEL(array, index)
@@ -234,7 +234,7 @@ private:
                         adtypep,
                         "Array extraction with width miscomputed " << adtypep->width() << "/"
                                                                    << fromRange.elements());
-            int elwidth = adtypep->width() / fromRange.elements();
+            const int elwidth = adtypep->width() / fromRange.elements();
             AstSel* newp = new AstSel(
                 nodep->fileline(), fromp,
                 new AstMul(nodep->fileline(),
@@ -335,9 +335,9 @@ private:
         vlsint32_t msb = VN_CAST(msbp, Const)->toSInt();
         vlsint32_t lsb = VN_CAST(lsbp, Const)->toSInt();
         vlsint32_t elem = (msb > lsb) ? (msb - lsb + 1) : (lsb - msb + 1);
-        FromData fromdata = fromDataForArray(nodep, fromp);
+        const FromData fromdata = fromDataForArray(nodep, fromp);
         AstNodeDType* ddtypep = fromdata.m_dtypep;
-        VNumRange fromRange = fromdata.m_fromRange;
+        const VNumRange fromRange = fromdata.m_fromRange;
         if (VN_IS(ddtypep, UnpackArrayDType)) {
             // Slice extraction
             if (fromRange.elements() == elem
@@ -378,7 +378,7 @@ private:
                 msb = lsb;
                 lsb = x;
             }
-            int elwidth = adtypep->width() / fromRange.elements();
+            const int elwidth = adtypep->width() / fromRange.elements();
             AstSel* newp = new AstSel(
                 nodep->fileline(), fromp,
                 new AstMul(nodep->fileline(), newSubLsbOf(lsbp, fromRange),
@@ -479,15 +479,15 @@ private:
         AstNode* rhsp = nodep->rhsp()->unlinkFrBack();
         AstNode* widthp = nodep->thsp()->unlinkFrBack();
         warnTri(rhsp);
-        int width = VN_CAST(widthp, Const)->toSInt();
+        const int width = VN_CAST(widthp, Const)->toSInt();
         if (width > (1 << 28)) {
             nodep->v3error("Width of :+ or :- is huge; vector of over 1billion bits: "
                            << widthp->prettyName());
         }
         if (width < 0) nodep->v3error("Width of :+ or :- is < 0: " << widthp->prettyName());
-        FromData fromdata = fromDataForArray(nodep, fromp);
+        const FromData fromdata = fromDataForArray(nodep, fromp);
         AstNodeDType* ddtypep = fromdata.m_dtypep;
-        VNumRange fromRange = fromdata.m_fromRange;
+        const VNumRange fromRange = fromdata.m_fromRange;
         if (VN_IS(ddtypep, UnpackArrayDType)) {
             // Slice +: and -: extraction
             if (fromRange.elements() == width && VN_IS(rhsp, Const)
diff --git a/src/Verilator.cpp b/src/Verilator.cpp
index 187c01586..8ee9b114f 100644
--- a/src/Verilator.cpp
+++ b/src/Verilator.cpp
@@ -704,7 +704,7 @@ int main(int argc, char** argv, char** env) {
 
     // Command option parsing
     v3Global.opt.bin(argv[0]);
-    string argString = V3Options::argString(argc - 1, argv + 1);
+    const string argString = V3Options::argString(argc - 1, argv + 1);
     v3Global.opt.parseOpts(new FileLine(FileLine::commandLineFilename()), argc - 1, argv + 1);
 
     // Validate settings (aka Boost.Program_options)
diff --git a/src/VlcMain.cpp b/src/VlcMain.cpp
index 970aab9c3..f29fef2c4 100644
--- a/src/VlcMain.cpp
+++ b/src/VlcMain.cpp
@@ -79,7 +79,7 @@ void VlcOptions::parseOptsList(int argc, char** argv) {
     for (int i = 0; i < argc;) {
         UINFO(9, " Option: " << argv[i] << endl);
         if (argv[i][0] == '-') {
-            if (int consumed = parser.parse(i, argc, argv)) {
+            if (const int consumed = parser.parse(i, argc, argv)) {
                 i += consumed;
             } else {
                 v3fatal("Invalid option: " << argv[i] << parser.getSuggestion(argv[i]));
diff --git a/src/VlcPoint.h b/src/VlcPoint.h
index 8e20f999d..26c8f5c65 100644
--- a/src/VlcPoint.h
+++ b/src/VlcPoint.h
@@ -61,7 +61,7 @@ public:
     // METHODS
     string keyExtract(const char* shortKey) const {
         // Hot function
-        size_t shortLen = std::strlen(shortKey);
+        const size_t shortLen = std::strlen(shortKey);
         const string namestr = name();
         for (const char* cp = namestr.c_str(); *cp; ++cp) {
             if (*cp == '\001') {
diff --git a/src/VlcTop.cpp b/src/VlcTop.cpp
index 5999e8ba3..606404666 100644
--- a/src/VlcTop.cpp
+++ b/src/VlcTop.cpp
@@ -37,14 +37,14 @@ void VlcTop::readCoverage(const string& filename, bool nonfatal) {
     VlcTest* testp = tests().newTest(filename, 0, 0);
 
     while (!is.eof()) {
-        string line = V3Os::getline(is);
+        const string line = V3Os::getline(is);
         // UINFO(9," got "<<line<<endl);
         if (line[0] == 'C') {
             string::size_type secspace = 3;
             for (; secspace < line.length(); secspace++) {
                 if (line[secspace] == '\'' && line[secspace + 1] == ' ') break;
             }
-            string point = line.substr(3, secspace - 3);
+            const string point = line.substr(3, secspace - 3);
             vluint64_t hits = std::atoll(line.c_str() + secspace + 1);
             // UINFO(9,"   point '"<<point<<"'"<<" "<<hits<<endl);
 
@@ -112,7 +112,7 @@ void VlcTop::writeInfo(const string& filename) {
         os << "SF:" << source.name() << '\n';
         VlcSource::LinenoMap& lines = source.lines();
         for (auto& li : lines) {
-            int lineno = li.first;
+            const int lineno = li.first;
             VlcSource::ColumnMap& cmap = li.second;
             bool first = true;
             vluint64_t min_count = 0;  // Minimum across all columns on line
@@ -198,14 +198,14 @@ void VlcTop::annotateCalc() {
     // Calculate per-line information into filedata structure
     for (const auto& i : m_points) {
         const VlcPoint& point = m_points.pointNumber(i.second);
-        string filename = point.filename();
-        int lineno = point.lineno();
+        const string filename = point.filename();
+        const int lineno = point.lineno();
         if (!filename.empty() && lineno != 0) {
             VlcSource& source = sources().findNewSource(filename);
-            string threshStr = point.thresh();
+            const string threshStr = point.thresh();
             unsigned thresh
                 = (!threshStr.empty()) ? std::atoi(threshStr.c_str()) : opt.annotateMin();
-            bool ok = (point.count() >= thresh);
+            const bool ok = (point.count() >= thresh);
             UINFO(9, "AnnoCalc count " << filename << ":" << lineno << ":" << point.column() << " "
                                        << point.count() << " " << point.linescov() << '\n');
             // Base coverage
@@ -214,7 +214,7 @@ void VlcTop::annotateCalc() {
             bool range = false;
             int start = 0;
             int end = 0;
-            string linescov = point.linescov();
+            const string linescov = point.linescov();
             for (const char* covp = linescov.c_str(); true; ++covp) {
                 if (!*covp || *covp == ',') {  // Ending
                     for (int lni = start; start && lni <= end; ++lni) {
@@ -262,7 +262,7 @@ void VlcTop::annotateCalcNeeded() {
             }
         }
     }
-    float pct = totCases ? (100 * totOk / totCases) : 0;
+    const float pct = totCases ? (100 * totOk / totCases) : 0;
     cout << "Total coverage (" << totOk << "/" << totCases << ") ";
     cout << std::fixed << std::setw(3) << std::setprecision(2) << pct << "%\n";
     if (totOk != totCases) cout << "See lines with '%00' in " << opt.annotateOut() << '\n';
@@ -274,8 +274,8 @@ void VlcTop::annotateOutputFiles(const string& dirname) {
     for (auto& si : m_sources) {
         VlcSource& source = si.second;
         if (!source.needed()) continue;
-        string filename = source.name();
-        string outfilename = dirname + "/" + V3Os::filenameNonDir(filename);
+        const string filename = source.name();
+        const string outfilename = dirname + "/" + V3Os::filenameNonDir(filename);
 
         UINFO(1, "annotateOutputFile " << filename << " -> " << outfilename << endl);
 

From 7ecc2d4df743c8a2744c72a3c38575fddbb19abe Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Mon, 21 Jun 2021 15:32:58 +0100
Subject: [PATCH 46/73] V3Hash: Add missing include.

Fixes #3029
---
 src/V3Hash.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/V3Hash.cpp b/src/V3Hash.cpp
index 2f1b33003..35d924771 100644
--- a/src/V3Hash.cpp
+++ b/src/V3Hash.cpp
@@ -18,6 +18,7 @@
 
 #include <functional>
 #include <iomanip>
+#include <iostream>
 
 V3Hash::V3Hash(const std::string& val)
     : m_value{static_cast<uint32_t>(std::hash<std::string>{}(val))} {}

From ec1c1127914bd3df4e9a7441051e920af0fef182 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Mon, 21 Jun 2021 17:38:42 +0100
Subject: [PATCH 47/73] Remove deprecated --inhibit-sim (#3035)

---
 Changes                      |  1 +
 bin/verilator                |  1 -
 docs/guide/deprecations.rst  |  4 ----
 docs/guide/exe_verilator.rst |  8 --------
 src/V3EmitC.cpp              | 14 --------------
 src/V3Options.cpp            |  4 ----
 src/V3Options.h              |  2 --
 7 files changed, 1 insertion(+), 33 deletions(-)

diff --git a/Changes b/Changes
index e3d23ce0c..981f6211e 100644
--- a/Changes
+++ b/Changes
@@ -20,6 +20,7 @@ Verilator 4.205 devel
 
 * Optimize a lot more model variables into function locals (#3027). [Geza Lore]
 * Remove deprecated --no-relative-cfuncs option (#3024). [Geza Lore]
+* Remove deprecated --inhibit-sim option (#3035). [Geza Lore]
 * Merge const static data globally into a new constant pool (#3013). [Geza Lore]
 * Allow configure override of AR program (#2999). [ahouska]
 * In XML, show pinIndex information (#2877). [errae233]
diff --git a/bin/verilator b/bin/verilator
index 752412a3c..0e7dddd1b 100755
--- a/bin/verilator
+++ b/bin/verilator
@@ -332,7 +332,6 @@ detailed descriptions of these arguments.
     --gate-stmts <value>        Tune gate optimizer depth
     --if-depth <value>          Tune IFDEPTH warning
      +incdir+<dir>              Directory to search for includes
-    --inhibit-sim               Create function to turn off sim
     --inline-mult <value>       Tune module inlining
      -LDFLAGS <flags>           Linker pre-object arguments for makefile
     --l2-name <value>           Verilog scope name of the top module
diff --git a/docs/guide/deprecations.rst b/docs/guide/deprecations.rst
index 2bc811c1a..aa9fcb5df 100644
--- a/docs/guide/deprecations.rst
+++ b/docs/guide/deprecations.rst
@@ -11,10 +11,6 @@ C++11 compiler support
   require C++14 or newer compilers for both compiling Verilator and
   compiling Verilated models no sooner than January 2022.
 
-Inhibit-Sim Option
-  The :vlopt:`--inhibit-sim` option is planned for removal no sooner than
-  July 2021.
-
 Configuration File -msg
   The :vlopt:`lint_off` "-msg" option has been replaced with the "-rule"
   option.  "-msg" is planned for removal no sooner than January 2021.
diff --git a/docs/guide/exe_verilator.rst b/docs/guide/exe_verilator.rst
index 626a6575d..9fc6b68e8 100644
--- a/docs/guide/exe_verilator.rst
+++ b/docs/guide/exe_verilator.rst
@@ -527,14 +527,6 @@ Summary:
 
    See :vlopt:`-y`.
 
-.. option:: --inhibit-sim
-
-   Rarely needed and deprecated.  Create a :code:`inhibitSim(bool)`
-   function to enable and disable evaluation.  This allows an upper level
-   testbench to disable modules that are not important in a given
-   simulation, without needing to recompile or change the SystemC modules
-   instantiated.
-
 .. option:: --inline-mult <value>
 
    Tune the inlining of modules.  The default value of 2000 specifies that up
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index ea505740b..460709e39 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -2490,11 +2490,6 @@ void EmitCImp::emitCtorImp(AstNodeModule* modp) {
 
     emitSensitives();
 
-    putsDecoration("// Reset internal values\n");
-    if (modp->isTop()) {
-        if (v3Global.opt.inhibitSim()) puts("__Vm_inhibitSim = false;\n");
-        puts("\n");
-    }
     putsDecoration("// Reset structure values\n");
     puts(modName + "__" + protect("_ctor_var_reset") + "(this);\n");
     emitTextSection(AstType::atScCtor);
@@ -2644,7 +2639,6 @@ void EmitCImp::emitSavableImp(AstNodeModule* modp) {
             puts("os " + op + " vlSymsp->_vm_contextp__;\n");
 
             // Save all members
-            if (v3Global.opt.inhibitSim()) puts("os" + op + "__Vm_inhibitSim;\n");
             for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
                 if (const AstVar* varp = VN_CAST(nodep, Var)) {
                     if (varp->isIO() && modp->isTop() && optSystemC()) {
@@ -2830,7 +2824,6 @@ void EmitCImp::emitWrapEval() {
     putsDecoration("// Initialize\n");
     puts("if (VL_UNLIKELY(!vlSymsp->__Vm_didInit)) " + protect("_eval_initial_loop")
          + "(this);\n");
-    if (v3Global.opt.inhibitSim()) puts("if (VL_UNLIKELY(__Vm_inhibitSim)) return;\n");
 
     if (v3Global.opt.threads() == 1) {
         uint32_t mtaskId = 0;
@@ -3207,9 +3200,6 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
     }
     ofp()->putsPrivate(false);  // public:
     if (modp->isTop()) {
-        if (v3Global.opt.inhibitSim()) {
-            puts("bool __Vm_inhibitSim;  ///< Set true to disable evaluation of module\n");
-        }
         if (v3Global.opt.mtasks()) emitThreadingState();
     }
     emitCoverageDecl(modp);  // may flip public/private
@@ -3314,10 +3304,6 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
                  "must call on completion.\n");
         }
         puts("void final();\n");
-        if (v3Global.opt.inhibitSim()) {
-            puts("/// Disable evaluation of module (e.g. turn off)\n");
-            puts("void inhibitSim(bool flag) { __Vm_inhibitSim = flag; }\n");
-        }
     }
 
     puts("\n// INTERNAL METHODS\n");
diff --git a/src/V3Options.cpp b/src/V3Options.cpp
index 0944e812b..9fb3da414 100644
--- a/src/V3Options.cpp
+++ b/src/V3Options.cpp
@@ -1097,10 +1097,6 @@ void V3Options::parseOptsList(FileLine* fl, const string& optdir, int argc, char
                 [this, &optdir](const char* optp) { addIncDirUser(parseFileArg(optdir, optp)); });
     DECL_OPTION("-if-depth", Set, &m_ifDepth);
     DECL_OPTION("-ignc", OnOff, &m_ignc);
-    DECL_OPTION("-inhibit-sim", CbOnOff, [this, fl](bool flag) {
-        fl->v3warn(DEPRECATED, "-inhibit-sim option is deprecated");
-        m_inhibitSim = flag;
-    });
     DECL_OPTION("-inline-mult", Set, &m_inlineMult);
 
     DECL_OPTION("-LDFLAGS", CbVal, callStrSetter(&V3Options::addLdLibs));
diff --git a/src/V3Options.h b/src/V3Options.h
index af6e127b8..f6002f722 100644
--- a/src/V3Options.h
+++ b/src/V3Options.h
@@ -242,7 +242,6 @@ private:
     bool m_hierarchical = false;    // main switch: --hierarchical
     bool m_hierChild = false;       // main switch: --hierarchical-child
     bool m_ignc = false;            // main switch: --ignc
-    bool m_inhibitSim = false;      // main switch: --inhibit-sim
     bool m_lintOnly = false;        // main switch: --lint-only
     bool m_gmake = false;           // main switch: --make gmake
     bool m_main = false;            // main swithc: --main
@@ -470,7 +469,6 @@ public:
     bool publicFlatRW() const { return m_publicFlatRW; }
     bool lintOnly() const { return m_lintOnly; }
     bool ignc() const { return m_ignc; }
-    bool inhibitSim() const { return m_inhibitSim; }
     bool quietExit() const { return m_quietExit; }
     bool reportUnoptflat() const { return m_reportUnoptflat; }
     bool verilate() const { return m_verilate; }

From f311a0a5a592d904537720c546aacf3d4d165ade Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Tue, 22 Jun 2021 08:43:54 -0400
Subject: [PATCH 48/73] Internals: Add const. No functional change.

---
 src/V3EmitCSyms.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/V3EmitCSyms.cpp b/src/V3EmitCSyms.cpp
index 1a4bbca13..17307fa24 100644
--- a/src/V3EmitCSyms.cpp
+++ b/src/V3EmitCSyms.cpp
@@ -423,7 +423,7 @@ void EmitCSyms::emitSymHdr() {
 
     puts("\n// LOCAL STATE\n");
     // Must be before subcells, as constructor order needed before _vlCoverInsert.
-    puts("const char* __Vm_namep;\n");
+    puts("const char* const __Vm_namep;\n");
 
     if (v3Global.needTraceDumper()) {
         // __Vm_dumperp is local, otherwise we wouldn't know what design's eval()

From a198a3c1e10a4b56a968de7eb277ed12484516eb Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Thu, 24 Jun 2021 16:48:58 +0100
Subject: [PATCH 49/73] Add extern "C" to function declarations in VPI tests.

These are necessary to link the executables. So far we have been saved
by one of the generated headers forward declaring these functions with
extern "C", but changing that header would break these tests.
---
 test_regress/t/t_vpi_get.cpp    | 2 +-
 test_regress/t/t_vpi_memory.cpp | 2 +-
 test_regress/t/t_vpi_param.cpp  | 2 +-
 test_regress/t/t_vpi_unimpl.cpp | 2 +-
 test_regress/t/t_vpi_var.cpp    | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/test_regress/t/t_vpi_get.cpp b/test_regress/t/t_vpi_get.cpp
index 592246b3b..3b1d41d07 100644
--- a/test_regress/t/t_vpi_get.cpp
+++ b/test_regress/t/t_vpi_get.cpp
@@ -202,7 +202,7 @@ int mon_check_props() {
     return 0;
 }
 
-int mon_check() {
+extern "C" int mon_check() {
     // Callback from initial block in monitor
     if (int status = mon_check_props()) return status;
     return 0;  // Ok
diff --git a/test_regress/t/t_vpi_memory.cpp b/test_regress/t/t_vpi_memory.cpp
index 3dc17b55a..b6b1a83df 100644
--- a/test_regress/t/t_vpi_memory.cpp
+++ b/test_regress/t/t_vpi_memory.cpp
@@ -213,7 +213,7 @@ void _mon_check_memory() {
     }
 }
 
-int mon_check() {
+extern "C" int mon_check() {
     // Callback from initial block in monitor
     _mon_check_memory();
     return errors;
diff --git a/test_regress/t/t_vpi_param.cpp b/test_regress/t/t_vpi_param.cpp
index ac6275b15..cee164fe3 100644
--- a/test_regress/t/t_vpi_param.cpp
+++ b/test_regress/t/t_vpi_param.cpp
@@ -203,7 +203,7 @@ int _mon_check_param() {
     return status;
 }
 
-int mon_check() {
+extern "C" int mon_check() {
     // Callback from initial block in monitor
     if (int status = _mon_check_param()) return status;
     return 0;  // Ok
diff --git a/test_regress/t/t_vpi_unimpl.cpp b/test_regress/t/t_vpi_unimpl.cpp
index 5706be271..816c9eca3 100644
--- a/test_regress/t/t_vpi_unimpl.cpp
+++ b/test_regress/t/t_vpi_unimpl.cpp
@@ -176,7 +176,7 @@ int _mon_check_unimpl(p_cb_data cb_data) {
     return 0;  // Ok
 }
 
-int mon_check() {
+extern "C" int mon_check() {
     // Callback from initial block in monitor
     if (int status = _mon_check_unimpl(NULL)) return status;
     return 0;  // Ok
diff --git a/test_regress/t/t_vpi_var.cpp b/test_regress/t/t_vpi_var.cpp
index 9ddd720e2..2861d58b8 100644
--- a/test_regress/t/t_vpi_var.cpp
+++ b/test_regress/t/t_vpi_var.cpp
@@ -638,7 +638,7 @@ int _mon_check_vlog_info() {
     return 0;
 }
 
-int mon_check() {
+extern "C" int mon_check() {
     // Callback from initial block in monitor
 #ifdef TEST_VERBOSE
     printf("-mon_check()\n");

From 525040801939f9e24444534257e9d6b8b93f9670 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Thu, 24 Jun 2021 16:58:30 +0100
Subject: [PATCH 50/73] Add V3EmitCBase.cpp to hold implementations

No need to keep complex functions in the V3EmitCBase.h header (which is
included in a lot of compilation units). No functional change intended.
---
 src/Makefile_obj.in |   1 +
 src/V3EmitCBase.cpp | 108 ++++++++++++++++++++++++++++++++++++++++++++
 src/V3EmitCBase.h   |  85 ++--------------------------------
 3 files changed, 114 insertions(+), 80 deletions(-)
 create mode 100644 src/V3EmitCBase.cpp

diff --git a/src/Makefile_obj.in b/src/Makefile_obj.in
index 9618840c6..04d1ff0f8 100644
--- a/src/Makefile_obj.in
+++ b/src/Makefile_obj.in
@@ -180,6 +180,7 @@ RAW_OBJS = \
 	V3Descope.o \
 	V3DupFinder.o \
 	V3EmitC.o \
+	V3EmitCBase.o \
 	V3EmitCConstPool.o \
 	V3EmitCInlines.o \
 	V3EmitCSyms.o \
diff --git a/src/V3EmitCBase.cpp b/src/V3EmitCBase.cpp
new file mode 100644
index 000000000..8552b69b9
--- /dev/null
+++ b/src/V3EmitCBase.cpp
@@ -0,0 +1,108 @@
+// -*- mode: C++; c-file-style: "cc-mode" -*-
+//*************************************************************************
+// DESCRIPTION: Verilator: Emit C++ for tree
+//
+// Code available from: https://verilator.org
+//
+//*************************************************************************
+//
+// Copyright 2003-2021 by Wilson Snyder. This program is free software; you
+// can redistribute it and/or modify it under the terms of either the GNU
+// Lesser General Public License Version 3 or the Perl Artistic License
+// Version 2.0.
+// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+//
+//*************************************************************************
+
+#include "config_build.h"
+#include "verilatedos.h"
+
+#include "V3EmitCBase.h"
+
+//######################################################################
+// EmitCBaseVisitor implementation
+
+string EmitCBaseVisitor::funcNameProtect(const AstCFunc* nodep, const AstNodeModule* modp) {
+    modp = modp ? modp : VN_CAST(nodep->user4p(), NodeModule);
+    string name;
+    if (nodep->isConstructor()) {
+        name += prefixNameProtect(modp);
+    } else if (nodep->isDestructor()) {
+        name += "~";
+        name += prefixNameProtect(modp);
+    } else {
+        if (nodep->isLoose()) {
+            name += prefixNameProtect(modp);
+            name += "__";
+        }
+        name += nodep->nameProtect();
+    }
+    return name;
+}
+
+AstCFile* EmitCBaseVisitor::newCFile(const string& filename, bool slow, bool source) {
+    AstCFile* cfilep = new AstCFile(v3Global.rootp()->fileline(), filename);
+    cfilep->slow(slow);
+    cfilep->source(source);
+    v3Global.rootp()->addFilesp(cfilep);
+    return cfilep;
+}
+
+string EmitCBaseVisitor::cFuncArgs(const AstCFunc* nodep) {
+    // Return argument list for given C function
+    string args;
+    if (nodep->isLoose() && !nodep->isStatic()) {
+        if (nodep->isConst().trueKnown()) args += "const ";
+        AstNodeModule* modp = VN_CAST(nodep->user4p(), NodeModule);
+        args += prefixNameProtect(modp);
+        args += "* vlSelf";
+    }
+    if (!nodep->argTypes().empty()) {
+        if (!args.empty()) args += ", ";
+        args += nodep->argTypes();
+    }
+    // Might be a user function with argument list.
+    for (const AstNode* stmtp = nodep->argsp(); stmtp; stmtp = stmtp->nextp()) {
+        if (const AstVar* portp = VN_CAST_CONST(stmtp, Var)) {
+            if (portp->isIO() && !portp->isFuncReturn()) {
+                if (args != "") args += ", ";
+                if (nodep->dpiImportPrototype() || nodep->dpiExportDispatcher()) {
+                    args += portp->dpiArgType(true, false);
+                } else if (nodep->funcPublic()) {
+                    args += portp->cPubArgType(true, false);
+                } else {
+                    args += portp->vlArgType(true, false, true);
+                }
+            }
+        }
+    }
+    return args;
+}
+
+void EmitCBaseVisitor::emitCFuncHeader(const AstCFunc* funcp, const AstNodeModule* modp,
+                                       bool withScope) {
+    if (!funcp->isConstructor() && !funcp->isDestructor()) {
+        puts(funcp->rtnTypeVoid());
+        puts(" ");
+    }
+    if (withScope && funcp->isProperMethod()) puts(prefixNameProtect(modp) + "::");
+    puts(funcNameProtect(funcp, modp));
+    puts("(" + cFuncArgs(funcp) + ")");
+    if (funcp->isConst().trueKnown() && funcp->isProperMethod()) puts(" const");
+}
+
+void EmitCBaseVisitor::emitCFuncDecl(const AstCFunc* funcp, const AstNodeModule* modp,
+                                     bool cLinkage) {
+    ensureNewLine();
+    if (!funcp->ifdef().empty()) puts("#ifdef " + funcp->ifdef() + "\n");
+    if (cLinkage) puts("extern \"C\" ");
+    if (funcp->isStatic() && funcp->isProperMethod()) puts("static ");
+    if (funcp->isVirtual()) {
+        UASSERT_OBJ(funcp->isProperMethod(), funcp, "Virtual function is not a proper method");
+        puts("virtual ");
+    }
+    emitCFuncHeader(funcp, modp, /* withScope: */ false);
+    if (funcp->slow()) puts(" VL_ATTR_COLD");
+    puts(";\n");
+    if (!funcp->ifdef().empty()) puts("#endif  // " + funcp->ifdef() + "\n");
+}
diff --git a/src/V3EmitCBase.h b/src/V3EmitCBase.h
index e3d32d827..144c0f921 100644
--- a/src/V3EmitCBase.h
+++ b/src/V3EmitCBase.h
@@ -62,23 +62,7 @@ public:
     static string symClassAssign() {
         return symClassName() + "* const __restrict vlSymsp VL_ATTR_UNUSED = vlSelf->vlSymsp;\n";
     }
-    static string funcNameProtect(const AstCFunc* nodep, const AstNodeModule* modp = nullptr) {
-        modp = modp ? modp : VN_CAST(nodep->user4p(), NodeModule);
-        string name;
-        if (nodep->isConstructor()) {
-            name += prefixNameProtect(modp);
-        } else if (nodep->isDestructor()) {
-            name += "~";
-            name += prefixNameProtect(modp);
-        } else {
-            if (nodep->isLoose()) {
-                name += prefixNameProtect(modp);
-                name += "__";
-            }
-            name += nodep->nameProtect();
-        }
-        return name;
-    }
+    static string funcNameProtect(const AstCFunc* nodep, const AstNodeModule* modp = nullptr);
     static string prefixNameProtect(const AstNode* nodep) {  // C++ name with prefix
         const AstNodeModule* modp = VN_CAST_CONST(nodep, NodeModule);
         if (modp && modp->isTop()) {
@@ -95,69 +79,10 @@ public:
         return modp == v3Global.rootp()->constPoolp()->modp();
     }
 
-    static AstCFile* newCFile(const string& filename, bool slow, bool source) {
-        AstCFile* cfilep = new AstCFile(v3Global.rootp()->fileline(), filename);
-        cfilep->slow(slow);
-        cfilep->source(source);
-        v3Global.rootp()->addFilesp(cfilep);
-        return cfilep;
-    }
-    string cFuncArgs(const AstCFunc* nodep) {
-        // Return argument list for given C function
-        string args;
-        if (nodep->isLoose() && !nodep->isStatic()) {
-            if (nodep->isConst().trueKnown()) args += "const ";
-            AstNodeModule* modp = VN_CAST(nodep->user4p(), NodeModule);
-            args += prefixNameProtect(modp);
-            args += "* vlSelf";
-        }
-        if (!nodep->argTypes().empty()) {
-            if (!args.empty()) args += ", ";
-            args += nodep->argTypes();
-        }
-        // Might be a user function with argument list.
-        for (const AstNode* stmtp = nodep->argsp(); stmtp; stmtp = stmtp->nextp()) {
-            if (const AstVar* portp = VN_CAST_CONST(stmtp, Var)) {
-                if (portp->isIO() && !portp->isFuncReturn()) {
-                    if (args != "") args += ", ";
-                    if (nodep->dpiImportPrototype() || nodep->dpiExportDispatcher()) {
-                        args += portp->dpiArgType(true, false);
-                    } else if (nodep->funcPublic()) {
-                        args += portp->cPubArgType(true, false);
-                    } else {
-                        args += portp->vlArgType(true, false, true);
-                    }
-                }
-            }
-        }
-        return args;
-    }
-
-    void emitCFuncHeader(const AstCFunc* funcp, const AstNodeModule* modp, bool withScope) {
-        if (!funcp->isConstructor() && !funcp->isDestructor()) {
-            puts(funcp->rtnTypeVoid());
-            puts(" ");
-        }
-        if (withScope && funcp->isProperMethod()) puts(prefixNameProtect(modp) + "::");
-        puts(funcNameProtect(funcp, modp));
-        puts("(" + cFuncArgs(funcp) + ")");
-        if (funcp->isConst().trueKnown() && funcp->isProperMethod()) puts(" const");
-    }
-
-    void emitCFuncDecl(const AstCFunc* funcp, const AstNodeModule* modp, bool cLinkage = false) {
-        ensureNewLine();
-        if (!funcp->ifdef().empty()) puts("#ifdef " + funcp->ifdef() + "\n");
-        if (cLinkage) puts("extern \"C\" ");
-        if (funcp->isStatic() && funcp->isProperMethod()) puts("static ");
-        if (funcp->isVirtual()) {
-            UASSERT_OBJ(funcp->isProperMethod(), funcp, "Virtual function is not a proper method");
-            puts("virtual ");
-        }
-        emitCFuncHeader(funcp, modp, /* withScope: */ false);
-        if (funcp->slow()) puts(" VL_ATTR_COLD");
-        puts(";\n");
-        if (!funcp->ifdef().empty()) puts("#endif  // " + funcp->ifdef() + "\n");
-    }
+    static AstCFile* newCFile(const string& filename, bool slow, bool source);
+    string cFuncArgs(const AstCFunc* nodep);
+    void emitCFuncHeader(const AstCFunc* funcp, const AstNodeModule* modp, bool withScope);
+    void emitCFuncDecl(const AstCFunc* funcp, const AstNodeModule* modp, bool cLinkage = false);
 
     // CONSTRUCTORS
     EmitCBaseVisitor() = default;

From bbbee8b89ed3eec02dc50b6684546ec23f1207ab Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Thu, 24 Jun 2021 17:08:07 +0100
Subject: [PATCH 51/73] Make emitVarDecl and emitModCUse reusable via
 V3EmitCBase.

Moved these 2 function into V3EmitCBase so we can reuse them later.
emitVarDecl required minor alteration to move building of m_ctorVarsVec
back into V3EmitC (which is now done in V3EmitC::emitSortedVarList).
No functional change intended.
---
 src/V3EmitC.cpp     | 104 +++-----------------------------------------
 src/V3EmitCBase.cpp |  96 ++++++++++++++++++++++++++++++++++++++++
 src/V3EmitCBase.h   |   2 +
 3 files changed, 104 insertions(+), 98 deletions(-)

diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 460709e39..e539edbf9 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -23,7 +23,6 @@
 #include "V3EmitCBase.h"
 #include "V3Number.h"
 #include "V3PartitionGraph.h"
-#include "V3Task.h"
 #include "V3TSP.h"
 
 #include <algorithm>
@@ -80,7 +79,6 @@ public:
     void displayArg(AstNode* dispp, AstNode** elistp, bool isScan, const string& vfmt, bool ignore,
                     char fmtLetter);
 
-    void emitVarDecl(const AstVar* nodep, const string& prefixIfImp);
     enum EisWhich : uint8_t {
         EVL_CLASS_IO,
         EVL_CLASS_SIG,
@@ -116,14 +114,6 @@ public:
 
     void emitOpName(AstNode* nodep, const string& format, AstNode* lhsp, AstNode* rhsp,
                     AstNode* thsp);
-    void emitDeclArrayBrackets(const AstVar* nodep) {
-        // This isn't very robust and may need cleanup for other data types
-        for (const AstUnpackArrayDType* arrayp
-             = VN_CAST_CONST(nodep->dtypeSkipRefp(), UnpackArrayDType);
-             arrayp; arrayp = VN_CAST_CONST(arrayp->subDTypep()->skipRefp(), UnpackArrayDType)) {
-            puts("[" + cvtToStr(arrayp->elementsConst()) + "]");
-        }
-    }
     void emitTypedefs(AstNode* firstp) {
         bool first = true;
         for (AstNode* loopp = firstp; loopp; loopp = loopp->nextp()) {
@@ -1742,24 +1732,6 @@ class EmitCImp final : EmitCStmts {
 
     // METHODS
     // Low level
-    void emitModCUse(AstNodeModule* modp, VUseType useType) {
-        string nl;
-        for (AstNode* itemp = modp->stmtsp(); itemp; itemp = itemp->nextp()) {
-            if (AstCUse* usep = VN_CAST(itemp, CUse)) {
-                if (usep->useType() == useType) {
-                    if (usep->useType().isInclude()) {
-                        puts("#include \"" + prefixNameProtect(usep) + ".h\"\n");
-                    }
-                    if (usep->useType().isFwdClass()) {
-                        puts("class " + prefixNameProtect(usep) + ";\n");
-                    }
-                    nl = "\n";
-                }
-            }
-        }
-        puts(nl);
-    }
-
     void emitVarReset(AstVar* varp) {
         AstNodeDType* const dtypep = varp->dtypep()->skipRefp();
         const string varNameProtected
@@ -1906,75 +1878,6 @@ public:
 //######################################################################
 // Internal EmitCStmts
 
-void EmitCStmts::emitVarDecl(const AstVar* nodep, const string& prefixIfImp) {
-    AstBasicDType* basicp = nodep->basicp();
-    if (nodep->isIO() && nodep->isSc()) {
-        UASSERT_OBJ(basicp, nodep, "Unimplemented: Outputting this data type");
-        m_ctorVarsVec.push_back(nodep);
-        if (nodep->attrScClocked() && nodep->isReadOnly()) {
-            puts("sc_in_clk ");
-        } else {
-            if (nodep->isInoutish()) {
-                puts("sc_inout<");
-            } else if (nodep->isWritable()) {
-                puts("sc_out<");
-            } else if (nodep->isNonOutput()) {
-                puts("sc_in<");
-            } else {
-                nodep->v3fatalSrc("Unknown type");
-            }
-            puts(nodep->scType());
-            puts("> ");
-        }
-        puts(nodep->nameProtect());
-        emitDeclArrayBrackets(nodep);
-        puts(";\n");
-    } else if (nodep->isIO() && basicp && !basicp->isOpaque()) {
-        if (nodep->isInoutish()) {
-            puts("VL_INOUT");
-        } else if (nodep->isWritable()) {
-            puts("VL_OUT");
-        } else if (nodep->isNonOutput()) {
-            puts("VL_IN");
-        } else {
-            nodep->v3fatalSrc("Unknown type");
-        }
-
-        if (nodep->isQuad()) {
-            puts("64");
-        } else if (nodep->widthMin() <= 8) {
-            puts("8");
-        } else if (nodep->widthMin() <= 16) {
-            puts("16");
-        } else if (nodep->isWide()) {
-            puts("W");
-        }
-
-        puts("(" + nodep->nameProtect());
-        emitDeclArrayBrackets(nodep);
-        // If it's a packed struct/array then nodep->width is the whole
-        // thing, msb/lsb is just lowest dimension
-        puts("," + cvtToStr(basicp->lo() + nodep->width() - 1) + "," + cvtToStr(basicp->lo()));
-        if (nodep->isWide()) puts("," + cvtToStr(nodep->widthWords()));
-        puts(");\n");
-    } else {
-        if (basicp && basicp->keyword().isMTaskState()) { m_ctorVarsVec.push_back(nodep); }
-        // strings and other fundamental c types
-        if (nodep->isFuncLocal() && nodep->isString()) {
-            const string name = nodep->name();
-            const string suffix = V3Task::dpiTemporaryVarSuffix();
-            // string temporary variable for DPI-C needs to be static because c_str() will be
-            // passed to C code and the lifetime of the variable must be long enough. See also
-            // Issue 2622.
-            const bool beStatic = name.size() >= suffix.size()
-                                  && name.substr(name.size() - suffix.size()) == suffix;
-            if (beStatic) puts("static VL_THREAD_LOCAL ");
-        }
-        puts(nodep->vlArgType(true, false, false, prefixIfImp));
-        puts(";\n");
-    }
-}
-
 void EmitCStmts::emitCtorSep(bool* firstp) {
     if (*firstp) {
         puts("  : ");
@@ -3084,7 +2987,12 @@ void EmitCStmts::emitSortedVarList(const VarVec& anons, const VarVec& nonanons,
         }
     }
     // Output nonanons
-    for (const AstVar* varp : nonanons) { emitVarDecl(varp, prefixIfImp); }
+    for (const AstVar* varp : nonanons) {
+        if (varp->isIO() && varp->isSc()) { m_ctorVarsVec.push_back(varp); }
+        AstBasicDType* const basicp = varp->basicp();
+        if (basicp && basicp->keyword().isMTaskState()) { m_ctorVarsVec.push_back(varp); }
+        emitVarDecl(varp, prefixIfImp);
+    }
 }
 
 void EmitCImp::emitThreadingState() {
diff --git a/src/V3EmitCBase.cpp b/src/V3EmitCBase.cpp
index 8552b69b9..48cee377f 100644
--- a/src/V3EmitCBase.cpp
+++ b/src/V3EmitCBase.cpp
@@ -18,6 +18,7 @@
 #include "verilatedos.h"
 
 #include "V3EmitCBase.h"
+#include "V3Task.h"
 
 //######################################################################
 // EmitCBaseVisitor implementation
@@ -106,3 +107,98 @@ void EmitCBaseVisitor::emitCFuncDecl(const AstCFunc* funcp, const AstNodeModule*
     puts(";\n");
     if (!funcp->ifdef().empty()) puts("#endif  // " + funcp->ifdef() + "\n");
 }
+
+void EmitCBaseVisitor::emitVarDecl(const AstVar* nodep, const string& prefixIfImp) {
+    const AstBasicDType* const basicp = nodep->basicp();
+
+    const auto emitDeclArrayBrackets = [this](const AstVar* nodep) -> void {
+        // This isn't very robust and may need cleanup for other data types
+        for (const AstUnpackArrayDType* arrayp
+             = VN_CAST_CONST(nodep->dtypeSkipRefp(), UnpackArrayDType);
+             arrayp; arrayp = VN_CAST_CONST(arrayp->subDTypep()->skipRefp(), UnpackArrayDType)) {
+            puts("[" + cvtToStr(arrayp->elementsConst()) + "]");
+        }
+    };
+
+    if (nodep->isIO() && nodep->isSc()) {
+        UASSERT_OBJ(basicp, nodep, "Unimplemented: Outputting this data type");
+        if (nodep->attrScClocked() && nodep->isReadOnly()) {
+            puts("sc_in_clk ");
+        } else {
+            if (nodep->isInoutish()) {
+                puts("sc_inout<");
+            } else if (nodep->isWritable()) {
+                puts("sc_out<");
+            } else if (nodep->isNonOutput()) {
+                puts("sc_in<");
+            } else {
+                nodep->v3fatalSrc("Unknown type");
+            }
+            puts(nodep->scType());
+            puts("> ");
+        }
+        puts(nodep->nameProtect());
+        emitDeclArrayBrackets(nodep);
+        puts(";\n");
+    } else if (nodep->isIO() && basicp && !basicp->isOpaque()) {
+        if (nodep->isInoutish()) {
+            puts("VL_INOUT");
+        } else if (nodep->isWritable()) {
+            puts("VL_OUT");
+        } else if (nodep->isNonOutput()) {
+            puts("VL_IN");
+        } else {
+            nodep->v3fatalSrc("Unknown type");
+        }
+
+        if (nodep->isQuad()) {
+            puts("64");
+        } else if (nodep->widthMin() <= 8) {
+            puts("8");
+        } else if (nodep->widthMin() <= 16) {
+            puts("16");
+        } else if (nodep->isWide()) {
+            puts("W");
+        }
+
+        puts("(" + nodep->nameProtect());
+        emitDeclArrayBrackets(nodep);
+        // If it's a packed struct/array then nodep->width is the whole
+        // thing, msb/lsb is just lowest dimension
+        puts("," + cvtToStr(basicp->lo() + nodep->width() - 1) + "," + cvtToStr(basicp->lo()));
+        if (nodep->isWide()) puts("," + cvtToStr(nodep->widthWords()));
+        puts(");\n");
+    } else {
+        // strings and other fundamental c types
+        if (nodep->isFuncLocal() && nodep->isString()) {
+            const string name = nodep->name();
+            const string suffix = V3Task::dpiTemporaryVarSuffix();
+            // string temporary variable for DPI-C needs to be static because c_str() will be
+            // passed to C code and the lifetime of the variable must be long enough. See also
+            // Issue 2622.
+            const bool beStatic = name.size() >= suffix.size()
+                                  && name.substr(name.size() - suffix.size()) == suffix;
+            if (beStatic) puts("static VL_THREAD_LOCAL ");
+        }
+        puts(nodep->vlArgType(true, false, false, prefixIfImp));
+        puts(";\n");
+    }
+}
+
+void EmitCBaseVisitor::emitModCUse(AstNodeModule* modp, VUseType useType) {
+    string nl;
+    for (AstNode* itemp = modp->stmtsp(); itemp; itemp = itemp->nextp()) {
+        if (AstCUse* usep = VN_CAST(itemp, CUse)) {
+            if (usep->useType() == useType) {
+                if (usep->useType().isInclude()) {
+                    puts("#include \"" + prefixNameProtect(usep) + ".h\"\n");
+                }
+                if (usep->useType().isFwdClass()) {
+                    puts("class " + prefixNameProtect(usep) + ";\n");
+                }
+                nl = "\n";
+            }
+        }
+    }
+    puts(nl);
+}
diff --git a/src/V3EmitCBase.h b/src/V3EmitCBase.h
index 144c0f921..81af458fe 100644
--- a/src/V3EmitCBase.h
+++ b/src/V3EmitCBase.h
@@ -83,6 +83,8 @@ public:
     string cFuncArgs(const AstCFunc* nodep);
     void emitCFuncHeader(const AstCFunc* funcp, const AstNodeModule* modp, bool withScope);
     void emitCFuncDecl(const AstCFunc* funcp, const AstNodeModule* modp, bool cLinkage = false);
+    void emitVarDecl(const AstVar* nodep, const string& prefixIfImp);
+    void emitModCUse(AstNodeModule* modp, VUseType useType);
 
     // CONSTRUCTORS
     EmitCBaseVisitor() = default;

From c6f6dab4136f316f1e5cbcb23bbf6873312f8e44 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Thu, 24 Jun 2021 17:35:12 +0100
Subject: [PATCH 52/73] Emit: Factor out parts needed for emitting an AstCFunc

Factored out bits from V3EmitC.cpp that is required to emit a whole
(non-trace) AstCFunc. This is mostly what used to be the EmitCStmts
class plus relevant bits from EmitCImp. These now live in EmitCFunc,
which is reusable by anything that needs to emit a regular AstCFunc
(differences in tracing to be addressed later). EmitCImp now extends
EmitCFunc instead of EmitCStmts. No functional change intended.
---
 src/Makefile_obj.in |    1 +
 src/V3EmitC.cpp     | 2445 ++-----------------------------------------
 src/V3EmitCFunc.cpp | 1091 +++++++++++++++++++
 src/V3EmitCFunc.h   | 1258 ++++++++++++++++++++++
 4 files changed, 2425 insertions(+), 2370 deletions(-)
 create mode 100644 src/V3EmitCFunc.cpp
 create mode 100644 src/V3EmitCFunc.h

diff --git a/src/Makefile_obj.in b/src/Makefile_obj.in
index 04d1ff0f8..9216ba3ff 100644
--- a/src/Makefile_obj.in
+++ b/src/Makefile_obj.in
@@ -182,6 +182,7 @@ RAW_OBJS = \
 	V3EmitC.o \
 	V3EmitCBase.o \
 	V3EmitCConstPool.o \
+	V3EmitCFunc.o \
 	V3EmitCInlines.o \
 	V3EmitCSyms.o \
 	V3EmitCMake.o \
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index e539edbf9..4e2bacc49 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -18,102 +18,88 @@
 #include "verilatedos.h"
 
 #include "V3Global.h"
-#include "V3String.h"
 #include "V3EmitC.h"
-#include "V3EmitCBase.h"
-#include "V3Number.h"
-#include "V3PartitionGraph.h"
-#include "V3TSP.h"
+#include "V3EmitCFunc.h"
 
-#include <algorithm>
-#include <map>
 #include <vector>
 #include <unordered_set>
 
-constexpr int VL_VALUE_STRING_MAX_WIDTH = 8192;  // We use a static char array in VL_VALUE_STRING
+//###################################################################### >
+// Internal EmitC implementation
 
-constexpr int EMITC_NUM_CONSTW
-    = 8;  // Number of VL_CONST_W_*X's in verilated.h (IE VL_CONST_W_8X is last)
+class EmitCImp final : EmitCFunc {
+    // MEMBERS
+    AstNodeModule* m_fileModp = nullptr;  // Files (names, headers) constructed using this module
+    bool m_slow = false;  // Creating __Slow file
+    bool m_fast = false;  // Creating non __Slow file (or both)
 
-//######################################################################
-// Emit statements and math operators
-
-class EmitCStmts VL_NOT_FINAL : public EmitCBaseVisitor {
-private:
-    using VarVec = std::vector<const AstVar*>;
-    using VarSortMap = std::map<int, VarVec>;  // Map size class to VarVec
-
-    bool m_suppressSemi;
-    AstVarRef* m_wideTempRefp;  // Variable that _WW macros should be setting
-    VarVec m_ctorVarsVec;  // All variables in constructor order
-    int m_labelNum;  // Next label number
-    int m_splitSize;  // # of cfunc nodes placed into output file
-    int m_splitFilenum;  // File number being created, 0 = primary
-    bool m_inUC = false;  // Inside an AstUCStmt or AstUCMath
-
-protected:
-    bool m_useSelfForThis = false;  // Replace "this" with "vlSelf"
-    AstNodeModule* m_modp = nullptr;  // Current module being emitted
-
-public:
+    //---------------------------------------
     // METHODS
-    VL_DEBUG_FUNC;  // Declare debug()
 
+    V3OutCFile* newOutCFile(bool slow, bool source, int filenum = 0) {
+        m_lazyDecls.reset();  // Need to emit new lazy declarations
+
+        string filenameNoExt = v3Global.opt.makeDir() + "/" + prefixNameProtect(m_fileModp);
+        if (filenum) filenameNoExt += "__" + cvtToStr(filenum);
+        filenameNoExt += (slow ? "__Slow" : "");
+        V3OutCFile* ofp = nullptr;
+        if (v3Global.opt.lintOnly()) {
+            // Unfortunately we have some lint checks here, so we can't just skip processing.
+            // We should move them to a different stage.
+            const string filename = VL_DEV_NULL;
+            newCFile(filename, slow, source);
+            ofp = new V3OutCFile(filename);
+        } else if (optSystemC()) {
+            const string filename = filenameNoExt + (source ? ".cpp" : ".h");
+            newCFile(filename, slow, source);
+            ofp = new V3OutScFile(filename);
+        } else {
+            const string filename = filenameNoExt + (source ? ".cpp" : ".h");
+            newCFile(filename, slow, source);
+            ofp = new V3OutCFile(filename);
+        }
+
+        ofp->putsHeader();
+        if (m_fileModp->isTop() && !source) {
+            ofp->puts("// DESCR"
+                      "IPTION: Verilator output: Primary design header\n");
+            ofp->puts("//\n");
+            ofp->puts("// This header should be included by all source files instantiating the "
+                      "design.\n");
+            ofp->puts("// The class here is then constructed to instantiate the design.\n");
+            ofp->puts("// See the Verilator manual for examples.\n");
+        } else {
+            if (source) {
+                ofp->puts("// DESCR"
+                          "IPTION: Verilator output: Design implementation internals\n");
+            } else {
+                ofp->puts("// DESCR"
+                          "IPTION: Verilator output: Design internal header\n");
+            }
+            ofp->puts("// See " + v3Global.opt.prefix() + ".h for the primary calling header\n");
+        }
+        return ofp;
+    }
+
+    //---------------------------------------
+    // VISITORS
+    using EmitCFunc::visit;  // Suppress hidden overloaded virtual function warning
+    virtual void visit(AstCFunc* nodep) override {
+        // TRACE_* and DPI handled elsewhere
+        if (nodep->funcType().isTrace()) return;
+        if (nodep->dpiImportPrototype()) return;
+        if (!(nodep->slow() ? m_slow : m_fast)) return;
+
+        maybeSplit();
+
+        EmitCFunc::visit(nodep);
+    }
+
+    //---------------------------------------
     // ACCESSORS
-    int splitFilenum() const { return m_splitFilenum; }
-    int splitFilenumInc() {
-        m_splitSize = 0;
-        return ++m_splitFilenum;
-    }
-    int splitSize() const { return m_splitSize; }
-    void splitSizeInc(int count) { m_splitSize += count; }
-    void splitSizeInc(AstNode* nodep) { splitSizeInc(EmitCBaseCounterVisitor(nodep).count()); }
-    bool splitNeeded() const {
-        return v3Global.opt.outputSplit() && splitSize() >= v3Global.opt.outputSplit();
-    }
 
     // METHODS
-    void displayNode(AstNode* nodep, AstScopeName* scopenamep, const string& vformat,
-                     AstNode* exprsp, bool isScan);
-    void displayEmit(AstNode* nodep, bool isScan);
-    void displayArg(AstNode* dispp, AstNode** elistp, bool isScan, const string& vfmt, bool ignore,
-                    char fmtLetter);
-
-    enum EisWhich : uint8_t {
-        EVL_CLASS_IO,
-        EVL_CLASS_SIG,
-        EVL_CLASS_TEMP,
-        EVL_CLASS_PAR,
-        EVL_CLASS_ALL,
-        EVL_FUNC_ALL
-    };
-    void emitVarList(AstNode* firstp, EisWhich which, const string& prefixIfImp, string& sectionr);
-    static void emitVarSort(const VarSortMap& vmap, VarVec* sortedp);
-    void emitSortedVarList(const VarVec& anons, const VarVec& nonanons, const string& prefixIfImp);
-    void emitVarCtors(bool* firstp);
-    void emitCtorSep(bool* firstp);
-    bool emitSimpleOk(AstNodeMath* nodep);
-    void emitIQW(AstNode* nodep) {
-        // Other abbrevs: "C"har, "S"hort, "F"loat, "D"ouble, stri"N"g
-        puts(nodep->dtypep()->charIQWN());
-    }
-    void emitScIQW(AstVar* nodep) {
-        UASSERT_OBJ(nodep->isSc(), nodep, "emitting SystemC operator on non-SC variable");
-        // clang-format off
-        puts(nodep->isScBigUint() ? "SB"
-             : nodep->isScUint()  ? "SU"
-             : nodep->isScBv()    ? "SW"
-             : (nodep->isScQuad() ? "SQ" : "SI"));
-        // clang-format on
-    }
-    void emitDatap(AstNode* nodep) {
-        // When passing to a function with va_args the compiler doesn't
-        // know need a pointer so when wide, need to look inside VlWide
-        if (nodep->isWide()) puts(".data()");
-    }
-
-    void emitOpName(AstNode* nodep, const string& format, AstNode* lhsp, AstNode* rhsp,
-                    AstNode* thsp);
+    // Low level
     void emitTypedefs(AstNode* firstp) {
         bool first = true;
         for (AstNode* loopp = firstp; loopp; loopp = loopp->nextp()) {
@@ -148,7 +134,6 @@ public:
             }
         }
     }
-
     void emitParams(AstNodeModule* modp, bool init, bool* firstp, string& sectionr) {
         bool anyi = false;
         for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
@@ -207,1644 +192,6 @@ public:
         }
         if (anyi) puts("\n");
     }
-
-    struct CmpName {
-        bool operator()(const AstNode* lhsp, const AstNode* rhsp) const {
-            return lhsp->name() < rhsp->name();
-        }
-    };
-    void emitIntFuncDecls(AstNodeModule* modp, bool inClassBody) {
-        std::vector<const AstCFunc*> funcsp;
-
-        for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
-            if (const AstCFunc* funcp = VN_CAST(nodep, CFunc)) {
-                if (funcp->dpiImportPrototype())  // DPI import prototypes are declared in __Dpi.h
-                    continue;
-                if (funcp->isMethod() != inClassBody)  // Only methods go inside class
-                    continue;
-                if (funcp->isMethod() && funcp->isLoose())  // Loose methods are declared lazily
-                    continue;
-                funcsp.push_back(funcp);
-            }
-        }
-
-        stable_sort(funcsp.begin(), funcsp.end(), CmpName());
-
-        for (const AstCFunc* funcp : funcsp) {
-            if (inClassBody) ofp()->putsPrivate(funcp->declPrivate());
-            emitCFuncDecl(funcp, modp);
-        }
-    }
-    void ccallIterateArgs(AstNodeCCall* nodep) {
-        bool comma = false;
-        if (nodep->funcp()->isLoose() && !nodep->funcp()->isStatic()) {
-            UASSERT_OBJ(!nodep->selfPointer().empty(), nodep,
-                        "Call to loose method without self pointer");
-            puts(nodep->selfPointerProtect(m_useSelfForThis));
-            comma = true;
-        }
-        if (!nodep->argTypes().empty()) {
-            if (comma) puts(", ");
-            puts(nodep->argTypes());
-            comma = true;
-        }
-        for (AstNode* subnodep = nodep->argsp(); subnodep; subnodep = subnodep->nextp()) {
-            if (comma) puts(", ");
-            iterate(subnodep);
-            comma = true;
-        }
-    }
-
-    void emitDereference(const string& pointer) {
-        if (pointer[0] == '(' && pointer[1] == '&') {
-            // remove "address of" followed by immediate dereference
-            // Note: this relies on only the form '(&OBJECT)' being used by Verilator
-            puts(pointer.substr(2, pointer.length() - 3));
-            puts(".");
-        } else {
-            puts(pointer);
-            puts("->");
-        }
-    }
-
-    // VISITORS
-    virtual void visit(AstNodeAssign* nodep) override {
-        bool paren = true;
-        bool decind = false;
-        if (AstSel* selp = VN_CAST(nodep->lhsp(), Sel)) {
-            if (selp->widthMin() == 1) {
-                putbs("VL_ASSIGNBIT_");
-                emitIQW(selp->fromp());
-                if (nodep->rhsp()->isAllOnesV()) {
-                    puts("O(");
-                } else {
-                    puts("I(");
-                }
-                puts(cvtToStr(nodep->widthMin()) + ",");
-                iterateAndNextNull(selp->lsbp());
-                puts(", ");
-                iterateAndNextNull(selp->fromp());
-                puts(", ");
-            } else {
-                putbs("VL_ASSIGNSEL_");
-                emitIQW(selp->fromp());
-                puts("II");
-                emitIQW(nodep->rhsp());
-                puts("(");
-                puts(cvtToStr(selp->fromp()->widthMin()) + ",");
-                puts(cvtToStr(nodep->widthMin()) + ",");
-                iterateAndNextNull(selp->lsbp());
-                puts(", ");
-                iterateAndNextNull(selp->fromp());
-                puts(", ");
-            }
-        } else if (AstGetcRefN* selp = VN_CAST(nodep->lhsp(), GetcRefN)) {
-            iterateAndNextNull(selp->lhsp());
-            puts(" = ");
-            putbs("VL_PUTC_N(");
-            iterateAndNextNull(selp->lhsp());
-            puts(", ");
-            iterateAndNextNull(selp->rhsp());
-            puts(", ");
-        } else if (AstVar* varp = AstVar::scVarRecurse(nodep->lhsp())) {
-            putbs("VL_ASSIGN_");  // Set a systemC variable
-            emitScIQW(varp);
-            emitIQW(nodep);
-            puts("(");
-            puts(cvtToStr(nodep->widthMin()) + ",");
-            iterateAndNextNull(nodep->lhsp());
-            puts(", ");
-        } else if (AstVar* varp = AstVar::scVarRecurse(nodep->rhsp())) {
-            putbs("VL_ASSIGN_");  // Get a systemC variable
-            emitIQW(nodep);
-            emitScIQW(varp);
-            puts("(");
-            puts(cvtToStr(nodep->widthMin()) + ",");
-            iterateAndNextNull(nodep->lhsp());
-            puts(", ");
-        } else if (nodep->isWide() && VN_IS(nodep->lhsp(), VarRef)  //
-                   && !VN_IS(nodep->rhsp(), CMath)  //
-                   && !VN_IS(nodep->rhsp(), CMethodHard)  //
-                   && !VN_IS(nodep->rhsp(), VarRef)  //
-                   && !VN_IS(nodep->rhsp(), AssocSel)  //
-                   && !VN_IS(nodep->rhsp(), ArraySel)) {
-            // Wide functions assign into the array directly, don't need separate assign statement
-            m_wideTempRefp = VN_CAST(nodep->lhsp(), VarRef);
-            paren = false;
-        } else if (nodep->isWide()) {
-            putbs("VL_ASSIGN_W(");
-            puts(cvtToStr(nodep->widthMin()) + ",");
-            iterateAndNextNull(nodep->lhsp());
-            puts(", ");
-        } else {
-            paren = false;
-            iterateAndNextNull(nodep->lhsp());
-            puts(" ");
-            ofp()->blockInc();
-            decind = true;
-            if (!VN_IS(nodep->rhsp(), Const)) ofp()->putBreak();
-            puts("= ");
-        }
-        iterateAndNextNull(nodep->rhsp());
-        if (paren) puts(")");
-        if (decind) ofp()->blockDec();
-        if (!m_suppressSemi) puts(";\n");
-    }
-    virtual void visit(AstAlwaysPublic*) override {}
-    virtual void visit(AstAssocSel* nodep) override {
-        iterateAndNextNull(nodep->fromp());
-        putbs(".at(");
-        AstAssocArrayDType* adtypep = VN_CAST(nodep->fromp()->dtypep(), AssocArrayDType);
-        UASSERT_OBJ(adtypep, nodep, "Associative select on non-associative type");
-        if (adtypep->keyDTypep()->isWide()) {
-            emitCvtWideArray(nodep->bitp(), nodep->fromp());
-        } else {
-            iterateAndNextNull(nodep->bitp());
-        }
-        puts(")");
-    }
-    virtual void visit(AstNodeCCall* nodep) override {
-        const AstCFunc* const funcp = nodep->funcp();
-        if (AstCMethodCall* ccallp = VN_CAST(nodep, CMethodCall)) {
-            UASSERT_OBJ(!funcp->isLoose(), nodep, "Loose method called via AstCMethodCall");
-            // make this a Ast type for future opt
-            iterate(ccallp->fromp());
-            putbs("->");
-            puts(funcp->nameProtect());
-        } else if (funcp->dpiImportPrototype()) {
-            // Calling DPI import
-            puts(funcp->name());
-        } else if (funcp->isProperMethod() && funcp->isStatic()) {
-            // Call static method via the containing class
-            puts(prefixNameProtect(funcp->user4p()) + "::");
-            puts(funcp->nameProtect());
-        } else if (VN_IS(funcp->user4p(), Class) && funcp->user4p() != m_modp) {
-            // Calling superclass method
-            puts(prefixNameProtect(funcp->user4p()) + "::");
-            puts(funcp->nameProtect());
-        } else if (funcp->isLoose()) {
-            // Calling loose method
-            puts(funcNameProtect(funcp));
-        } else {
-            // Calling regular method/function
-            if (!nodep->selfPointer().empty()) {
-                emitDereference(nodep->selfPointerProtect(m_useSelfForThis));
-            }
-            puts(funcp->nameProtect());
-        }
-        puts("(");
-        ccallIterateArgs(nodep);
-        if (VN_IS(nodep->backp(), NodeMath) || VN_IS(nodep->backp(), CReturn)) {
-            // We should have a separate CCall for math and statement usage, but...
-            puts(")");
-        } else {
-            puts(");\n");
-        }
-    }
-    virtual void visit(AstCMethodHard* nodep) override {
-        iterate(nodep->fromp());
-        puts(".");
-        puts(nodep->nameProtect());
-        puts("(");
-        bool comma = false;
-        for (AstNode* subnodep = nodep->pinsp(); subnodep; subnodep = subnodep->nextp()) {
-            if (comma) puts(", ");
-            // handle wide arguments to the queues
-            if (VN_IS(nodep->fromp()->dtypep(), QueueDType) && subnodep->dtypep()->isWide()) {
-                emitCvtWideArray(subnodep, nodep->fromp());
-            } else {
-                iterate(subnodep);
-            }
-            comma = true;
-        }
-        puts(")");
-        // Some are statements some are math.
-        if (nodep->isStatement()) puts(";\n");
-        UASSERT_OBJ(!nodep->isStatement() || VN_IS(nodep->dtypep(), VoidDType), nodep,
-                    "Statement of non-void data type");
-    }
-    virtual void visit(AstLambdaArgRef* nodep) override { putbs(nodep->nameProtect()); }
-    virtual void visit(AstWith* nodep) override {
-        // With uses a C++11 lambda
-        putbs("[=](");
-        if (auto* argrefp = nodep->indexArgRefp()) {
-            putbs(argrefp->dtypep()->cType(argrefp->nameProtect(), false, false));
-            puts(",");
-        }
-        if (auto* argrefp = nodep->valueArgRefp()) {
-            putbs(argrefp->dtypep()->cType(argrefp->nameProtect(), false, false));
-        }
-        // Probably fragile, V3Task may need to convert to a AstCReturn
-        puts(") { return ");
-        iterateAndNextNull(nodep->exprp());
-        puts("; }\n");
-    }
-    virtual void visit(AstIntfRef* nodep) override {
-        putsQuoted(VIdProtect::protectWordsIf(AstNode::vcdName(nodep->name()), nodep->protect()));
-    }
-    virtual void visit(AstNodeCase* nodep) override {  // LCOV_EXCL_LINE
-        // In V3Case...
-        nodep->v3fatalSrc("Case statements should have been reduced out");
-    }
-    virtual void visit(AstComment* nodep) override {
-        string at;
-        if (nodep->showAt()) {
-            at = " at " + nodep->fileline()->ascii();
-            // If protecting, passthru less information about the design
-            if (!v3Global.opt.protectIds()) return;
-        }
-        if (!(nodep->protect() && v3Global.opt.protectIds())) {
-            putsDecoration(string("// ") + nodep->name() + at + "\n");
-        }
-        iterateChildren(nodep);
-    }
-    virtual void visit(AstCoverDecl* nodep) override {
-        puts("vlSelf->__vlCoverInsert(");  // As Declared in emitCoverageDecl
-        puts("&(vlSymsp->__Vcoverage[");
-        puts(cvtToStr(nodep->dataDeclThisp()->binNum()));
-        puts("])");
-        // If this isn't the first instantiation of this module under this
-        // design, don't really count the bucket, and rely on verilator_cov to
-        // aggregate counts.  This is because Verilator combines all
-        // hierarchies itself, and if verilator_cov also did it, you'd end up
-        // with (number-of-instant) times too many counts in this bin.
-        puts(", first");  // Enable, passed from __Vconfigure parameter
-        puts(", ");
-        putsQuoted(protect(nodep->fileline()->filename()));
-        puts(", ");
-        puts(cvtToStr(nodep->fileline()->lineno()));
-        puts(", ");
-        puts(cvtToStr(nodep->offset() + nodep->fileline()->firstColumn()));
-        puts(", ");
-        putsQuoted((!nodep->hier().empty() ? "." : "")
-                   + protectWordsIf(nodep->hier(), nodep->protect()));
-        puts(", ");
-        putsQuoted(protectWordsIf(nodep->page(), nodep->protect()));
-        puts(", ");
-        putsQuoted(protectWordsIf(nodep->comment(), nodep->protect()));
-        puts(", ");
-        putsQuoted(nodep->linescov());
-        puts(");\n");
-    }
-    virtual void visit(AstCoverInc* nodep) override {
-        if (v3Global.opt.threads()) {
-            puts("vlSymsp->__Vcoverage[");
-            puts(cvtToStr(nodep->declp()->dataDeclThisp()->binNum()));
-            puts("].fetch_add(1, std::memory_order_relaxed);\n");
-        } else {
-            puts("++(vlSymsp->__Vcoverage[");
-            puts(cvtToStr(nodep->declp()->dataDeclThisp()->binNum()));
-            puts("]);\n");
-        }
-    }
-    virtual void visit(AstCReturn* nodep) override {
-        puts("return (");
-        iterateAndNextNull(nodep->lhsp());
-        puts(");\n");
-    }
-    virtual void visit(AstDisplay* nodep) override {
-        string text = nodep->fmtp()->text();
-        if (nodep->addNewline()) text += "\n";
-        displayNode(nodep, nodep->fmtp()->scopeNamep(), text, nodep->fmtp()->exprsp(), false);
-    }
-    virtual void visit(AstDumpCtl* nodep) override {
-        switch (nodep->ctlType()) {
-        case VDumpCtlType::FILE:
-            puts("vlSymsp->_vm_contextp__->dumpfile(");
-            emitCvtPackStr(nodep->exprp());
-            puts(");\n");
-            break;
-        case VDumpCtlType::VARS:
-            // We ignore number of levels to dump in exprp()
-            if (v3Global.opt.trace()) {
-                puts("vlSymsp->TOPp->_traceDumpOpen();\n");
-            } else {
-                puts("VL_PRINTF_MT(\"-Info: ");
-                puts(protect(nodep->fileline()->filename()));
-                puts(":");
-                puts(cvtToStr(nodep->fileline()->lineno()));
-                puts(": $dumpvar ignored, as Verilated without --trace");
-                puts("\\n\");\n");
-            }
-            break;
-        case VDumpCtlType::ALL:
-            // $dumpall currently ignored
-            break;
-        case VDumpCtlType::FLUSH:
-            // $dumpall currently ignored; would need rework of VCD single thread,
-            // or flag we pass-through to next eval() iteration
-            break;
-        case VDumpCtlType::LIMIT:
-            // $dumplimit currently ignored
-            break;
-        case VDumpCtlType::OFF:
-            // Currently ignored as both Vcd and Fst do not support them, as would need "X" dump
-            break;
-        case VDumpCtlType::ON:
-            // Currently ignored as $dumpoff is also ignored
-            break;
-        default: nodep->v3fatalSrc("Bad case, unexpected " << nodep->ctlType().ascii());
-        }
-    }
-    virtual void visit(AstScopeName* nodep) override {
-        // For use under AstCCalls for dpiImports.  ScopeNames under
-        // displays are handled in AstDisplay
-        if (!nodep->dpiExport()) {
-            // this is where the DPI import context scope is set
-            const string scope = nodep->scopeDpiName();
-            putbs("(&(vlSymsp->" + protect("__Vscope_" + scope) + "))");
-        }
-    }
-    virtual void visit(AstSFormat* nodep) override {
-        displayNode(nodep, nodep->fmtp()->scopeNamep(), nodep->fmtp()->text(),
-                    nodep->fmtp()->exprsp(), false);
-    }
-    virtual void visit(AstSFormatF* nodep) override {
-        displayNode(nodep, nodep->scopeNamep(), nodep->text(), nodep->exprsp(), false);
-    }
-    virtual void visit(AstFScanF* nodep) override {
-        displayNode(nodep, nullptr, nodep->text(), nodep->exprsp(), true);
-    }
-    virtual void visit(AstSScanF* nodep) override {
-        displayNode(nodep, nullptr, nodep->text(), nodep->exprsp(), true);
-    }
-    virtual void visit(AstValuePlusArgs* nodep) override {
-        puts("VL_VALUEPLUSARGS_IN");
-        emitIQW(nodep->outp());
-        puts("(");
-        puts(cvtToStr(nodep->outp()->widthMin()));
-        puts(", ");
-        emitCvtPackStr(nodep->searchp());
-        puts(", ");
-        putbs("");
-        iterateAndNextNull(nodep->outp());
-        puts(")");
-    }
-    virtual void visit(AstTestPlusArgs* nodep) override {
-        puts("VL_TESTPLUSARGS_I(");
-        putsQuoted(nodep->text());
-        puts(")");
-    }
-    virtual void visit(AstFError* nodep) override {
-        puts("VL_FERROR_IN(");
-        iterateAndNextNull(nodep->filep());
-        putbs(", ");
-        iterateAndNextNull(nodep->strp());
-        puts(")");
-    }
-    virtual void visit(AstFGetS* nodep) override {
-        checkMaxWords(nodep);
-        emitOpName(nodep, nodep->emitC(), nodep->lhsp(), nodep->rhsp(), nullptr);
-    }
-
-    void checkMaxWords(AstNode* nodep) {
-        if (nodep->widthWords() > VL_TO_STRING_MAX_WORDS) {
-            nodep->v3error(
-                "String of "
-                << nodep->width()
-                << " bits exceeds hardcoded limit VL_TO_STRING_MAX_WORDS in verilatedos.h");
-        }
-    }
-    virtual void visit(AstFOpen* nodep) override {
-        iterateAndNextNull(nodep->filep());
-        puts(" = VL_FOPEN_NN(");
-        emitCvtPackStr(nodep->filenamep());
-        putbs(", ");
-        if (nodep->modep()->width() > 4 * 8)
-            nodep->modep()->v3error("$fopen mode should be <= 4 characters");
-        emitCvtPackStr(nodep->modep());
-        puts(");\n");
-    }
-    virtual void visit(AstFOpenMcd* nodep) override {
-        iterateAndNextNull(nodep->filep());
-        puts(" = VL_FOPEN_MCD_N(");
-        emitCvtPackStr(nodep->filenamep());
-        puts(");\n");
-    }
-    virtual void visit(AstNodeReadWriteMem* nodep) override {
-        puts(nodep->cFuncPrefixp());
-        puts("N(");
-        puts(nodep->isHex() ? "true" : "false");
-        putbs(", ");
-        // Need real storage width
-        puts(cvtToStr(nodep->memp()->dtypep()->subDTypep()->widthMin()));
-        uint32_t array_lo = 0;
-        {
-            const AstVarRef* varrefp = VN_CAST(nodep->memp(), VarRef);
-            if (!varrefp) {
-                nodep->v3error(nodep->verilogKwd() << " loading non-variable");
-            } else if (VN_IS(varrefp->varp()->dtypeSkipRefp(), AssocArrayDType)) {
-                // nodep->memp() below will when verilated code is compiled create a C++ template
-            } else if (const AstUnpackArrayDType* adtypep
-                       = VN_CAST(varrefp->varp()->dtypeSkipRefp(), UnpackArrayDType)) {
-                putbs(", ");
-                puts(cvtToStr(varrefp->varp()->dtypep()->arrayUnpackedElements()));
-                array_lo = adtypep->lo();
-                putbs(", ");
-                puts(cvtToStr(array_lo));
-            } else {
-                nodep->v3error(nodep->verilogKwd()
-                               << " loading other than unpacked/associative-array variable");
-            }
-        }
-        putbs(", ");
-        emitCvtPackStr(nodep->filenamep());
-        putbs(", ");
-        {
-            const bool need_ptr = !VN_IS(nodep->memp()->dtypep(), AssocArrayDType);
-            if (need_ptr) puts(" &(");
-            iterateAndNextNull(nodep->memp());
-            if (need_ptr) puts(")");
-        }
-        putbs(", ");
-        if (nodep->lsbp()) {
-            iterateAndNextNull(nodep->lsbp());
-        } else {
-            puts(cvtToStr(array_lo));
-        }
-        putbs(", ");
-        if (nodep->msbp()) {
-            iterateAndNextNull(nodep->msbp());
-        } else {
-            puts("~0ULL");
-        }
-        puts(");\n");
-    }
-    virtual void visit(AstFClose* nodep) override {
-        puts("VL_FCLOSE_I(");
-        iterateAndNextNull(nodep->filep());
-        puts("); ");
-        iterateAndNextNull(nodep->filep());  // For safety, so user doesn't later WRITE with it.
-        puts(" = 0;\n");
-    }
-    virtual void visit(AstFFlush* nodep) override {
-        if (!nodep->filep()) {
-            puts("Verilated::runFlushCallbacks();\n");
-        } else {
-            puts("if (");
-            iterateAndNextNull(nodep->filep());
-            puts(") { VL_FFLUSH_I(");
-            iterateAndNextNull(nodep->filep());
-            puts("); }\n");
-        }
-    }
-    virtual void visit(AstFSeek* nodep) override {
-        puts("(VL_FSEEK_I(");
-        iterateAndNextNull(nodep->filep());
-        puts(",");
-        iterateAndNextNull(nodep->offset());
-        puts(",");
-        iterateAndNextNull(nodep->operation());
-        puts(") == -1 ? -1 : 0)");
-    }
-    virtual void visit(AstFTell* nodep) override {
-        puts("VL_FTELL_I(");
-        iterateAndNextNull(nodep->filep());
-        puts(")");
-    }
-    virtual void visit(AstFRewind* nodep) override {
-        puts("(VL_FSEEK_I(");
-        iterateAndNextNull(nodep->filep());
-        puts(", 0, 0) == -1 ? -1 : 0)");
-    }
-    virtual void visit(AstFRead* nodep) override {
-        puts("VL_FREAD_I(");
-        puts(cvtToStr(nodep->memp()->widthMin()));  // Need real storage width
-        putbs(",");
-        uint32_t array_lo = 0;
-        uint32_t array_size = 0;
-        {
-            const AstVarRef* varrefp = VN_CAST(nodep->memp(), VarRef);
-            if (!varrefp) {
-                nodep->v3error(nodep->verilogKwd() << " loading non-variable");
-            } else if (VN_CAST(varrefp->varp()->dtypeSkipRefp(), BasicDType)) {
-            } else if (const AstUnpackArrayDType* adtypep
-                       = VN_CAST(varrefp->varp()->dtypeSkipRefp(), UnpackArrayDType)) {
-                array_lo = adtypep->lo();
-                array_size = adtypep->elementsConst();
-            } else {
-                nodep->v3error(nodep->verilogKwd()
-                               << " loading other than unpacked-array variable");
-            }
-        }
-        puts(cvtToStr(array_lo));
-        putbs(",");
-        puts(cvtToStr(array_size));
-        putbs(", ");
-        puts("&(");
-        iterateAndNextNull(nodep->memp());
-        puts(")");
-        putbs(", ");
-        iterateAndNextNull(nodep->filep());
-        putbs(", ");
-        if (nodep->startp()) {
-            iterateAndNextNull(nodep->startp());
-        } else {
-            puts(cvtToStr(array_lo));
-        }
-        putbs(", ");
-        if (nodep->countp()) {
-            iterateAndNextNull(nodep->countp());
-        } else {
-            puts(cvtToStr(array_size));
-        }
-        puts(")");
-    }
-    virtual void visit(AstSysFuncAsTask* nodep) override {
-        if (!nodep->lhsp()->isWide()) puts("(void)");
-        iterateAndNextNull(nodep->lhsp());
-        if (!nodep->lhsp()->isWide()) puts(";");
-    }
-    virtual void visit(AstSystemT* nodep) override {
-        puts("(void)VL_SYSTEM_I");
-        emitIQW(nodep->lhsp());
-        puts("(");
-        if (nodep->lhsp()->isWide()) {
-            puts(cvtToStr(nodep->lhsp()->widthWords()));
-            putbs(", ");
-        }
-        checkMaxWords(nodep->lhsp());
-        iterateAndNextNull(nodep->lhsp());
-        puts(");\n");
-    }
-    virtual void visit(AstSystemF* nodep) override {
-        puts("VL_SYSTEM_I");
-        emitIQW(nodep->lhsp());
-        puts("(");
-        if (nodep->lhsp()->isWide()) {
-            puts(cvtToStr(nodep->lhsp()->widthWords()));
-            putbs(", ");
-        }
-        checkMaxWords(nodep->lhsp());
-        iterateAndNextNull(nodep->lhsp());
-        puts(")");
-    }
-    virtual void visit(AstJumpBlock* nodep) override {
-        nodep->labelNum(++m_labelNum);
-        puts("{\n");  // Make it visually obvious label jumps outside these
-        iterateAndNextNull(nodep->stmtsp());
-        iterateAndNextNull(nodep->endStmtsp());
-        puts("}\n");
-    }
-    virtual void visit(AstJumpGo* nodep) override {
-        puts("goto __Vlabel" + cvtToStr(nodep->labelp()->blockp()->labelNum()) + ";\n");
-    }
-    virtual void visit(AstJumpLabel* nodep) override {
-        puts("__Vlabel" + cvtToStr(nodep->blockp()->labelNum()) + ": ;\n");
-    }
-    virtual void visit(AstWhile* nodep) override {
-        iterateAndNextNull(nodep->precondsp());
-        puts("while (");
-        iterateAndNextNull(nodep->condp());
-        puts(") {\n");
-        iterateAndNextNull(nodep->bodysp());
-        iterateAndNextNull(nodep->incsp());
-        iterateAndNextNull(nodep->precondsp());  // Need to recompute before next loop
-        puts("}\n");
-    }
-    virtual void visit(AstNodeIf* nodep) override {
-        puts("if (");
-        if (!nodep->branchPred().unknown()) {
-            puts(nodep->branchPred().ascii());
-            puts("(");
-        }
-        iterateAndNextNull(nodep->condp());
-        if (!nodep->branchPred().unknown()) puts(")");
-        puts(") {\n");
-        iterateAndNextNull(nodep->ifsp());
-        puts("}");
-        if (!nodep->elsesp()) {
-            puts("\n");
-        } else {
-            if (VN_IS(nodep->elsesp(), NodeIf) && !nodep->elsesp()->nextp()) {
-                puts(" else ");
-                iterateAndNextNull(nodep->elsesp());
-            } else {
-                puts(" else {\n");
-                iterateAndNextNull(nodep->elsesp());
-                puts("}\n");
-            }
-        }
-    }
-    virtual void visit(AstExprStmt* nodep) override {
-        // GCC allows compound statements in expressions, but this is not standard.
-        // So we use an immediate-evaluation lambda and comma operator
-        putbs("([&]() {\n");
-        iterateAndNextNull(nodep->stmtsp());
-        puts("}(), ");
-        iterateAndNextNull(nodep->resultp());
-        puts(")");
-    }
-    virtual void visit(AstStop* nodep) override {
-        puts("VL_STOP_MT(");
-        putsQuoted(protect(nodep->fileline()->filename()));
-        puts(", ");
-        puts(cvtToStr(nodep->fileline()->lineno()));
-        puts(", \"\"");
-        puts(");\n");
-    }
-    virtual void visit(AstFinish* nodep) override {
-        puts("VL_FINISH_MT(");
-        putsQuoted(protect(nodep->fileline()->filename()));
-        puts(", ");
-        puts(cvtToStr(nodep->fileline()->lineno()));
-        puts(", \"\");\n");
-    }
-    virtual void visit(AstPrintTimeScale* nodep) override {
-        puts("VL_PRINTTIMESCALE(");
-        putsQuoted(protect(nodep->name()));
-        puts(", ");
-        putsQuoted(nodep->timeunit().ascii());
-        puts(", vlSymsp->_vm_contextp__);\n");
-    }
-    virtual void visit(AstRand* nodep) override {
-        emitOpName(nodep, nodep->emitC(), nodep->seedp(), nullptr, nullptr);
-    }
-    virtual void visit(AstTime* nodep) override {
-        puts("VL_TIME_UNITED_Q(");
-        if (nodep->timeunit().isNone()) nodep->v3fatalSrc("$time has no units");
-        puts(cvtToStr(nodep->timeunit().multiplier()
-                      / v3Global.rootp()->timeprecision().multiplier()));
-        puts(")");
-    }
-    virtual void visit(AstTimeD* nodep) override {
-        puts("VL_TIME_UNITED_D(");
-        if (nodep->timeunit().isNone()) nodep->v3fatalSrc("$realtime has no units");
-        puts(cvtToStr(nodep->timeunit().multiplier()
-                      / v3Global.rootp()->timeprecision().multiplier()));
-        puts(")");
-    }
-    virtual void visit(AstTimeFormat* nodep) override {
-        puts("VL_TIMEFORMAT_IINI(");
-        iterateAndNextNull(nodep->unitsp());
-        puts(", ");
-        iterateAndNextNull(nodep->precisionp());
-        puts(", ");
-        emitCvtPackStr(nodep->suffixp());
-        puts(", ");
-        iterateAndNextNull(nodep->widthp());
-        puts(", vlSymsp->_vm_contextp__);\n");
-    }
-    virtual void visit(AstNodeSimpleText* nodep) override {
-        const string text = m_inUC && m_useSelfForThis
-                                ? VString::replaceWord(nodep->text(), "this", "vlSelf")
-                                : nodep->text();
-        if (nodep->tracking() || m_trackText) {
-            puts(text);
-        } else {
-            ofp()->putsNoTracking(text);
-        }
-    }
-    virtual void visit(AstTextBlock* nodep) override {
-        visit(VN_CAST(nodep, NodeSimpleText));
-        for (AstNode* childp = nodep->nodesp(); childp; childp = childp->nextp()) {
-            iterate(childp);
-            if (nodep->commas() && childp->nextp()) puts(", ");
-        }
-    }
-    virtual void visit(AstCStmt* nodep) override {
-        putbs("");
-        iterateAndNextNull(nodep->bodysp());
-    }
-    virtual void visit(AstCMath* nodep) override {
-        putbs("");
-        iterateAndNextNull(nodep->bodysp());
-    }
-    virtual void visit(AstUCStmt* nodep) override {
-        VL_RESTORER(m_inUC);
-        m_inUC = true;
-        putsDecoration(ifNoProtect("// $c statement at " + nodep->fileline()->ascii() + "\n"));
-        iterateAndNextNull(nodep->bodysp());
-        puts("\n");
-    }
-    virtual void visit(AstUCFunc* nodep) override {
-        VL_RESTORER(m_inUC);
-        m_inUC = true;
-        puts("\n");
-        putsDecoration(ifNoProtect("// $c function at " + nodep->fileline()->ascii() + "\n"));
-        iterateAndNextNull(nodep->bodysp());
-        puts("\n");
-    }
-
-    // Operators
-    virtual void visit(AstNodeTermop* nodep) override {
-        emitOpName(nodep, nodep->emitC(), nullptr, nullptr, nullptr);
-    }
-    virtual void visit(AstNodeUniop* nodep) override {
-        if (nodep->emitCheckMaxWords()
-            && (nodep->widthWords() > VL_MULS_MAX_WORDS
-                || nodep->lhsp()->widthWords() > VL_MULS_MAX_WORDS)) {
-            nodep->v3warn(
-                E_UNSUPPORTED,
-                "Unsupported: "
-                    << nodep->prettyOperatorName() << " operator of " << nodep->width()
-                    << " bits exceeds hardcoded limit VL_MULS_MAX_WORDS in verilatedos.h");
-        }
-        if (emitSimpleOk(nodep)) {
-            putbs("(");
-            puts(nodep->emitSimpleOperator());
-            puts(" ");
-            iterateAndNextNull(nodep->lhsp());
-            puts(")");
-        } else {
-            emitOpName(nodep, nodep->emitC(), nodep->lhsp(), nullptr, nullptr);
-        }
-    }
-    virtual void visit(AstNodeBiop* nodep) override {
-        if (nodep->emitCheckMaxWords() && nodep->widthWords() > VL_MULS_MAX_WORDS) {
-            nodep->v3warn(
-                E_UNSUPPORTED,
-                "Unsupported: "
-                    << nodep->prettyOperatorName() << " operator of " << nodep->width()
-                    << " bits exceeds hardcoded limit VL_MULS_MAX_WORDS in verilatedos.h");
-        }
-        if (emitSimpleOk(nodep)) {
-            putbs("(");
-            iterateAndNextNull(nodep->lhsp());
-            puts(" ");
-            putbs(nodep->emitSimpleOperator());
-            puts(" ");
-            iterateAndNextNull(nodep->rhsp());
-            puts(")");
-        } else {
-            emitOpName(nodep, nodep->emitC(), nodep->lhsp(), nodep->rhsp(), nullptr);
-        }
-    }
-    virtual void visit(AstNodeTriop* nodep) override {
-        UASSERT_OBJ(!emitSimpleOk(nodep), nodep, "Triop cannot be described in a simple way");
-        emitOpName(nodep, nodep->emitC(), nodep->lhsp(), nodep->rhsp(), nodep->thsp());
-    }
-    virtual void visit(AstRedXor* nodep) override {
-        if (nodep->lhsp()->isWide()) {
-            visit(VN_CAST(nodep, NodeUniop));
-        } else {
-            putbs("VL_REDXOR_");
-            puts(cvtToStr(nodep->lhsp()->dtypep()->widthPow2()));
-            puts("(");
-            iterateAndNextNull(nodep->lhsp());
-            puts(")");
-        }
-    }
-    virtual void visit(AstCCast* nodep) override {
-        // Extending a value of the same word width is just a NOP.
-        if (nodep->size() <= VL_IDATASIZE) {
-            puts("(IData)(");
-        } else {
-            puts("(QData)(");
-        }
-        iterateAndNextNull(nodep->lhsp());
-        puts(")");
-    }
-    virtual void visit(AstNodeCond* nodep) override {
-        // Widths match up already, so we'll just use C++'s operator w/o any temps.
-        if (nodep->expr1p()->isWide()) {
-            emitOpName(nodep, nodep->emitC(), nodep->condp(), nodep->expr1p(), nodep->expr2p());
-        } else {
-            putbs("(");
-            iterateAndNextNull(nodep->condp());
-            putbs(" ? ");
-            iterateAndNextNull(nodep->expr1p());
-            putbs(" : ");
-            iterateAndNextNull(nodep->expr2p());
-            puts(")");
-        }
-    }
-    virtual void visit(AstMemberSel* nodep) override {
-        iterateAndNextNull(nodep->fromp());
-        putbs("->");
-        puts(nodep->varp()->nameProtect());
-    }
-    virtual void visit(AstNullCheck* nodep) override {
-        puts("VL_NULL_CHECK(");
-        iterateAndNextNull(nodep->lhsp());
-        puts(", ");
-        putsQuoted(protect(nodep->fileline()->filename()));
-        puts(", ");
-        puts(cvtToStr(nodep->fileline()->lineno()));
-        puts(")");
-    }
-    virtual void visit(AstCNew* nodep) override {
-        puts("std::make_shared<" + prefixNameProtect(nodep->dtypep()) + ">(");
-        puts("vlSymsp");  // TODO make this part of argsp, and eliminate when unnecessary
-        if (nodep->argsp()) puts(", ");
-        iterateAndNextNull(nodep->argsp());
-        puts(")");
-    }
-    virtual void visit(AstNewCopy* nodep) override {
-        puts("std::make_shared<" + prefixNameProtect(nodep->dtypep()) + ">(");
-        puts("*");  // i.e. make into a reference
-        iterateAndNextNull(nodep->rhsp());
-        puts(")");
-    }
-    virtual void visit(AstSel* nodep) override {
-        // Note ASSIGN checks for this on a LHS
-        emitOpName(nodep, nodep->emitC(), nodep->fromp(), nodep->lsbp(), nodep->thsp());
-    }
-    virtual void visit(AstReplicate* nodep) override {
-        if (nodep->lhsp()->widthMin() == 1 && !nodep->isWide()) {
-            UASSERT_OBJ((static_cast<int>(VN_CAST(nodep->rhsp(), Const)->toUInt())
-                         * nodep->lhsp()->widthMin())
-                            == nodep->widthMin(),
-                        nodep, "Replicate non-constant or width miscomputed");
-            puts("VL_REPLICATE_");
-            emitIQW(nodep);
-            puts("OI(");
-            puts(cvtToStr(nodep->widthMin()));
-            if (nodep->lhsp()) puts("," + cvtToStr(nodep->lhsp()->widthMin()));
-            if (nodep->rhsp()) puts("," + cvtToStr(nodep->rhsp()->widthMin()));
-            puts(",");
-            iterateAndNextNull(nodep->lhsp());
-            puts(", ");
-            iterateAndNextNull(nodep->rhsp());
-            puts(")");
-        } else {
-            emitOpName(nodep, nodep->emitC(), nodep->lhsp(), nodep->rhsp(), nullptr);
-        }
-    }
-    virtual void visit(AstStreamL* nodep) override {
-        // Attempt to use a "fast" stream function for slice size = power of 2
-        if (!nodep->isWide()) {
-            uint32_t isPow2 = VN_CAST(nodep->rhsp(), Const)->num().countOnes() == 1;
-            uint32_t sliceSize = VN_CAST(nodep->rhsp(), Const)->toUInt();
-            if (isPow2 && sliceSize <= (nodep->isQuad() ? sizeof(uint64_t) : sizeof(uint32_t))) {
-                puts("VL_STREAML_FAST_");
-                emitIQW(nodep);
-                emitIQW(nodep->lhsp());
-                puts("I(");
-                puts(cvtToStr(nodep->widthMin()));
-                puts("," + cvtToStr(nodep->lhsp()->widthMin()));
-                puts("," + cvtToStr(nodep->rhsp()->widthMin()));
-                puts(",");
-                iterateAndNextNull(nodep->lhsp());
-                puts(", ");
-                uint32_t rd_log2 = V3Number::log2b(VN_CAST(nodep->rhsp(), Const)->toUInt());
-                puts(cvtToStr(rd_log2) + ")");
-                return;
-            }
-        }
-        emitOpName(nodep, "VL_STREAML_%nq%lq%rq(%nw,%lw,%rw, %P, %li, %ri)", nodep->lhsp(),
-                   nodep->rhsp(), nullptr);
-    }
-    virtual void visit(AstCastDynamic* nodep) override {
-        putbs("VL_CAST_DYNAMIC(");
-        iterateAndNextNull(nodep->lhsp());
-        puts(", ");
-        iterateAndNextNull(nodep->rhsp());
-        puts(")");
-    }
-    virtual void visit(AstCountBits* nodep) override {
-        putbs("VL_COUNTBITS_");
-        emitIQW(nodep->lhsp());
-        puts("(");
-        puts(cvtToStr(nodep->lhsp()->widthMin()));
-        puts(", ");
-        if (nodep->lhsp()->isWide()) {
-            puts(cvtToStr(nodep->lhsp()->widthWords()));  // Note argument width, not node width
-                                                          // (which is always 32)
-            puts(", ");
-        }
-        iterateAndNextNull(nodep->lhsp());
-        puts(", ");
-        iterateAndNextNull(nodep->rhsp());
-        puts(", ");
-        iterateAndNextNull(nodep->thsp());
-        puts(", ");
-        iterateAndNextNull(nodep->fhsp());
-        puts(")");
-    }
-    virtual void visit(AstInitItem* nodep) override { iterateChildren(nodep); }
-    // Terminals
-    virtual void visit(AstVarRef* nodep) override {
-        const AstVar* const varp = nodep->varp();
-        if (isConstPoolMod(varp->user4p())) {
-            // Reference to constant pool variable
-            puts(topClassName() + "__ConstPool__");
-        } else if (varp->isStatic()) {
-            // Access static variable via the containing class
-            puts(prefixNameProtect(varp->user4p()) + "::");
-        } else if (VN_IS(varp->user4p(), Class) && varp->user4p() != m_modp) {
-            // Superclass member reference
-            puts(prefixNameProtect(varp->user4p()) + "::");
-        } else if (!nodep->selfPointer().empty()) {
-            emitDereference(nodep->selfPointerProtect(m_useSelfForThis));
-        }
-        puts(nodep->varp()->nameProtect());
-    }
-    virtual void visit(AstAddrOfCFunc* nodep) override {
-        // Note: Can be thought to handle more, but this is all that is needed right now
-        AstCFunc* const funcp = nodep->funcp();
-        UASSERT_OBJ(funcp->isLoose(), nodep, "Cannot take address of non-loose method");
-        puts("&");
-        puts(funcNameProtect(funcp));
-    }
-    void emitCvtPackStr(AstNode* nodep) {
-        if (const AstConst* constp = VN_CAST(nodep, Const)) {
-            putbs("std::string(");
-            putsQuoted(constp->num().toString());
-            puts(")");
-        } else {
-            putbs("VL_CVT_PACK_STR_N");
-            emitIQW(nodep);
-            puts("(");
-            if (nodep->isWide()) {
-                // Note argument width, not node width (which is always 32)
-                puts(cvtToStr(nodep->widthWords()));
-                puts(", ");
-            }
-            iterateAndNextNull(nodep);
-            puts(")");
-        }
-    }
-    void emitCvtWideArray(AstNode* nodep, AstNode* fromp) {
-        putbs("VL_CVT_W_A(");
-        iterate(nodep);
-        puts(", ");
-        iterate(fromp);
-        putbs(".atDefault()");  // Not accessed; only to get the proper type of values
-        puts(")");
-    }
-    void emitConstant(AstConst* nodep, AstVarRef* assigntop, const string& assignString) {
-        // Put out constant set to the specified variable, or given variable in a string
-        if (nodep->num().isFourState()) {
-            nodep->v3warn(E_UNSUPPORTED, "Unsupported: 4-state numbers in this context");
-        } else if (nodep->num().isString()) {
-            putbs("std::string(");
-            putsQuoted(nodep->num().toString());
-            puts(")");
-        } else if (nodep->isWide()) {
-            int upWidth = nodep->num().widthMin();
-            int chunks = 0;
-            if (upWidth > EMITC_NUM_CONSTW * VL_EDATASIZE) {
-                // Output e.g. 8 words in groups of e.g. 8
-                chunks = (upWidth - 1) / (EMITC_NUM_CONSTW * VL_EDATASIZE);
-                upWidth %= (EMITC_NUM_CONSTW * VL_EDATASIZE);
-                if (upWidth == 0) upWidth = (EMITC_NUM_CONSTW * VL_EDATASIZE);
-            }
-            {  // Upper e.g. 8 words
-                if (chunks) {
-                    putbs("VL_CONSTHI_W_");
-                    puts(cvtToStr(VL_WORDS_I(upWidth)));
-                    puts("X(");
-                    puts(cvtToStr(nodep->widthMin()));
-                    puts(",");
-                    puts(cvtToStr(chunks * EMITC_NUM_CONSTW * VL_EDATASIZE));
-                } else {
-                    putbs("VL_CONST_W_");
-                    puts(cvtToStr(VL_WORDS_I(upWidth)));
-                    puts("X(");
-                    puts(cvtToStr(nodep->widthMin()));
-                }
-                puts(",");
-                if (!assigntop) {
-                    puts(assignString);
-                } else if (VN_IS(assigntop, VarRef)) {
-                    if (!assigntop->selfPointer().empty()) {
-                        emitDereference(assigntop->selfPointerProtect(m_useSelfForThis));
-                    }
-                    puts(assigntop->varp()->nameProtect());
-                } else {
-                    iterateAndNextNull(assigntop);
-                }
-                for (int word = VL_WORDS_I(upWidth) - 1; word >= 0; word--) {
-                    // Only 32 bits - llx + long long here just to appease CPP format warning
-                    ofp()->printf(",0x%08" VL_PRI64 "x",
-                                  static_cast<vluint64_t>(
-                                      nodep->num().edataWord(word + chunks * EMITC_NUM_CONSTW)));
-                }
-                puts(")");
-            }
-            for (chunks--; chunks >= 0; chunks--) {
-                puts(";\n");
-                putbs("VL_CONSTLO_W_");
-                puts(cvtToStr(EMITC_NUM_CONSTW));
-                puts("X(");
-                puts(cvtToStr(chunks * EMITC_NUM_CONSTW * VL_EDATASIZE));
-                puts(",");
-                if (!assigntop) {
-                    puts(assignString);
-                } else if (VN_IS(assigntop, VarRef)) {
-                    if (!assigntop->selfPointer().empty()) {
-                        emitDereference(assigntop->selfPointerProtect(m_useSelfForThis));
-                    }
-                    puts(assigntop->varp()->nameProtect());
-                } else {
-                    iterateAndNextNull(assigntop);
-                }
-                for (int word = EMITC_NUM_CONSTW - 1; word >= 0; word--) {
-                    // Only 32 bits - llx + long long here just to appease CPP format warning
-                    ofp()->printf(",0x%08" VL_PRI64 "x",
-                                  static_cast<vluint64_t>(
-                                      nodep->num().edataWord(word + chunks * EMITC_NUM_CONSTW)));
-                }
-                puts(")");
-            }
-        } else if (nodep->isDouble()) {
-            if (int(nodep->num().toDouble()) == nodep->num().toDouble()
-                && nodep->num().toDouble() < 1000 && nodep->num().toDouble() > -1000) {
-                ofp()->printf("%3.1f", nodep->num().toDouble());  // Force decimal point
-            } else {
-                // Not %g as will not always put in decimal point, so not obvious to compiler
-                // is a real number
-                ofp()->printf("%.17e", nodep->num().toDouble());
-            }
-        } else if (nodep->isQuad()) {
-            vluint64_t num = nodep->toUQuad();
-            if (num < 10) {
-                ofp()->printf("%" VL_PRI64 "uULL", num);
-            } else {
-                ofp()->printf("0x%" VL_PRI64 "xULL", num);
-            }
-        } else {
-            uint32_t num = nodep->toUInt();
-            // Only 32 bits - llx + long long here just to appease CPP format warning
-            if (num < 10) {
-                puts(cvtToStr(num));
-            } else {
-                ofp()->printf("0x%" VL_PRI64 "x", static_cast<vluint64_t>(num));
-            }
-            // If signed, we'll do our own functions
-            // But must be here, or <= comparisons etc may end up signed
-            puts("U");
-        }
-    }
-    void emitSetVarConstant(const string& assignString, AstConst* constp) {
-        if (!constp->isWide()) {
-            puts(assignString);
-            puts(" = ");
-        }
-        emitConstant(constp, nullptr, assignString);
-        puts(";\n");
-    }
-    virtual void visit(AstConst* nodep) override {
-        if (nodep->isWide()) {
-            UASSERT_OBJ(m_wideTempRefp, nodep, "Wide Constant w/ no temp");
-            emitConstant(nodep, m_wideTempRefp, "");
-            m_wideTempRefp = nullptr;  // We used it, barf if set it a second time
-        } else {
-            emitConstant(nodep, nullptr, "");
-        }
-    }
-
-    // Just iterate
-    virtual void visit(AstNetlist* nodep) override { iterateChildren(nodep); }
-    virtual void visit(AstTopScope* nodep) override { iterateChildren(nodep); }
-    virtual void visit(AstScope* nodep) override { iterateChildren(nodep); }
-    // NOPs
-    virtual void visit(AstTypedef*) override {}
-    virtual void visit(AstPragma*) override {}
-    virtual void visit(AstCell*) override {}  // Handled outside the Visit class
-    virtual void visit(AstVar*) override {}  // Handled outside the Visit class
-    virtual void visit(AstNodeText*) override {}  // Handled outside the Visit class
-    virtual void visit(AstTraceDecl*) override {}  // Handled outside the Visit class
-    virtual void visit(AstTraceInc*) override {}  // Handled outside the Visit class
-    virtual void visit(AstCFile*) override {}  // Handled outside the Visit class
-    virtual void visit(AstCellInline*) override {}  // Handled outside visit (in EmitCSyms)
-    virtual void visit(AstCUse*) override {}  // Handled outside the Visit class
-    // Default
-    virtual void visit(AstNode* nodep) override {
-        puts(string("\n???? // ") + nodep->prettyTypeName() + "\n");
-        iterateChildren(nodep);
-        if (!v3Global.opt.lintOnly()) {  // An internal problem, so suppress
-            nodep->v3fatalSrc("Unknown node type reached emitter: " << nodep->prettyTypeName());
-        }
-    }
-
-    EmitCStmts() {
-        m_suppressSemi = false;
-        m_wideTempRefp = nullptr;
-        m_labelNum = 0;
-        m_splitSize = 0;
-        m_splitFilenum = 0;
-    }
-    EmitCStmts(AstNode* nodep, V3OutCFile* ofp, bool trackText = false)
-        : EmitCStmts{} {
-        m_ofp = ofp;
-        m_trackText = trackText;
-        iterate(nodep);
-    }
-    virtual ~EmitCStmts() override = default;
-};
-
-//######################################################################
-// Establish mtask variable sort order in mtasks mode
-
-class EmitVarTspSorter final : public V3TSP::TspStateBase {
-private:
-    // MEMBERS
-    const MTaskIdSet& m_mtaskIds;  // Mtask we're ordering
-    static unsigned s_serialNext;  // Unique ID to establish serial order
-    unsigned m_serial;  // Serial ordering
-public:
-    // CONSTRUCTORS
-    explicit EmitVarTspSorter(const MTaskIdSet& mtaskIds)
-        : m_mtaskIds(mtaskIds) {  // Cannot be {} or GCC 4.8 false warning
-        m_serial = ++s_serialNext;  // Cannot be ()/{} or GCC 4.8 false warning
-    }
-    virtual ~EmitVarTspSorter() = default;
-    // METHODS
-    virtual bool operator<(const TspStateBase& other) const override {
-        return operator<(dynamic_cast<const EmitVarTspSorter&>(other));
-    }
-    bool operator<(const EmitVarTspSorter& other) const { return m_serial < other.m_serial; }
-    const MTaskIdSet& mtaskIds() const { return m_mtaskIds; }
-    virtual int cost(const TspStateBase* otherp) const override {
-        return cost(dynamic_cast<const EmitVarTspSorter*>(otherp));
-    }
-    virtual int cost(const EmitVarTspSorter* otherp) const {
-        int cost = diffs(m_mtaskIds, otherp->m_mtaskIds);
-        cost += diffs(otherp->m_mtaskIds, m_mtaskIds);
-        return cost;
-    }
-    // Returns the number of elements in set_a that don't appear in set_b
-    static int diffs(const MTaskIdSet& set_a, const MTaskIdSet& set_b) {
-        int diffs = 0;
-        for (int i : set_a) {
-            if (set_b.find(i) == set_b.end()) ++diffs;
-        }
-        return diffs;
-    }
-};
-
-unsigned EmitVarTspSorter::s_serialNext = 0;
-
-//######################################################################
-// Emit lazy forward declarations
-
-class EmitCLazyDecls final : public AstNVisitor {
-    // NODE STATE/TYPES
-    //  AstNode::user2() -> bool. Already emitted decl for symbols.
-    AstUser2InUse m_inuser2;
-
-    // MEMBERS
-    std::unordered_set<string> m_emittedManually;  // Set of names already declared manually.
-    EmitCBaseVisitor& m_emitter;  // For access to file output
-    bool m_needsBlankLine = false;  // Emit blank line if any declarations were emitted (cosmetic)
-
-    void lazyDeclare(AstCFunc* funcp) {
-        // Already declared in this compilation unit
-        if (funcp->user2SetOnce()) return;
-        // Check if this kind of function is lazily declared
-        if (!(funcp->isMethod() && funcp->isLoose()) && !funcp->dpiImportPrototype()) return;
-        // Already declared manually
-        if (m_emittedManually.count(funcp->nameProtect())) return;
-        // Needs lazy declaration, emit one
-        m_emitter.emitCFuncDecl(funcp, VN_CAST_CONST(funcp->user4p(), NodeModule),
-                                funcp->dpiImportPrototype());
-        m_needsBlankLine = true;
-    }
-
-    void lazyDeclareConstPoolVar(AstVar* varp) {
-        if (varp->user2SetOnce()) return;  // Already declared
-        const string nameProtect
-            = m_emitter.topClassName() + "__ConstPool__" + varp->nameProtect();
-        m_emitter.puts("extern const ");
-        m_emitter.puts(varp->dtypep()->cType(nameProtect, false, false));
-        m_emitter.puts(";\n");
-        m_needsBlankLine = true;
-    }
-
-    virtual void visit(AstNodeCCall* nodep) override {
-        lazyDeclare(nodep->funcp());
-        iterateChildren(nodep);
-    }
-
-    virtual void visit(AstAddrOfCFunc* nodep) override {  //
-        lazyDeclare(nodep->funcp());
-    }
-
-    virtual void visit(AstVarRef* nodep) override {
-        AstVar* const varp = nodep->varp();
-        // Only constant pool symbols are lazy declared for now ...
-        if (EmitCBaseVisitor::isConstPoolMod(varp->user4p())) { lazyDeclareConstPoolVar(varp); }
-    }
-
-    virtual void visit(AstNode* nodep) override { iterateChildrenConst(nodep); }
-
-    VL_DEBUG_FUNC;
-
-public:
-    EmitCLazyDecls(EmitCBaseVisitor& emitter)
-        : m_emitter(emitter) {}
-    void emit(AstNode* nodep) {
-        m_needsBlankLine = false;
-        iterateChildrenConst(nodep);
-        if (m_needsBlankLine) m_emitter.puts("\n");
-    }
-    void emit(const string& prefix, const string& name, const string& suffix) {
-        m_emittedManually.insert(name);
-        m_emitter.ensureNewLine();
-        m_emitter.puts(prefix);
-        m_emitter.puts(name);
-        m_emitter.puts(suffix);
-        m_emitter.ensureNewLine();
-    }
-    void declared(AstCFunc* nodep) { nodep->user2SetOnce(); }
-    void reset() { AstNode::user2ClearTree(); }
-};
-
-//######################################################################
-// Internal EmitC implementation
-
-class EmitCImp final : EmitCStmts {
-    // NODE STATE/TYPES
-    //  AstNode::user2() -> bool. Used by EmitCLazyDecls (already declared)
-
-    // MEMBERS
-    AstNodeModule* m_fileModp = nullptr;  // Files (names, headers) constructed using this module
-    std::vector<AstChangeDet*> m_blkChangeDetVec;  // All encountered changes in block
-    bool m_slow = false;  // Creating __Slow file
-    bool m_fast = false;  // Creating non __Slow file (or both)
-    EmitCLazyDecls m_lazyDecls;  // Visitor for emitting lazy declarations
-
-    //---------------------------------------
-    // METHODS
-
-    void doubleOrDetect(AstChangeDet* changep, bool& gotOne) {
-        // cppcheck-suppress variableScope
-        static int s_addDoubleOr = 10;  // Determined experimentally as best
-        if (!changep->rhsp()) {
-            if (!gotOne) {
-                gotOne = true;
-            } else {
-                puts(" | ");
-            }
-            iterateAndNextNull(changep->lhsp());
-        } else {
-            AstNode* lhsp = changep->lhsp();
-            AstNode* rhsp = changep->rhsp();
-            UASSERT_OBJ(VN_IS(lhsp, VarRef) || VN_IS(lhsp, ArraySel), changep, "Not ref?");
-            UASSERT_OBJ(VN_IS(rhsp, VarRef) || VN_IS(rhsp, ArraySel), changep, "Not ref?");
-            for (int word = 0;
-                 word < (changep->lhsp()->isWide() ? changep->lhsp()->widthWords() : 1); ++word) {
-                if (!gotOne) {
-                    gotOne = true;
-                    s_addDoubleOr = 10;
-                    puts("(");
-                } else if (--s_addDoubleOr == 0) {
-                    puts("|| (");
-                    s_addDoubleOr = 10;
-                } else {
-                    puts(" | (");
-                }
-                iterateAndNextNull(changep->lhsp());
-                if (changep->lhsp()->isWide()) puts("[" + cvtToStr(word) + "]");
-                if (changep->lhsp()->isDouble()) {
-                    puts(" != ");
-                } else {
-                    puts(" ^ ");
-                }
-                iterateAndNextNull(changep->rhsp());
-                if (changep->lhsp()->isWide()) puts("[" + cvtToStr(word) + "]");
-                puts(")");
-            }
-        }
-    }
-
-    V3OutCFile* newOutCFile(bool slow, bool source, int filenum = 0) {
-        m_lazyDecls.reset();  // Need to emit new lazy declarations
-
-        string filenameNoExt = v3Global.opt.makeDir() + "/" + prefixNameProtect(m_fileModp);
-        if (filenum) filenameNoExt += "__" + cvtToStr(filenum);
-        filenameNoExt += (slow ? "__Slow" : "");
-        V3OutCFile* ofp = nullptr;
-        if (v3Global.opt.lintOnly()) {
-            // Unfortunately we have some lint checks here, so we can't just skip processing.
-            // We should move them to a different stage.
-            const string filename = VL_DEV_NULL;
-            newCFile(filename, slow, source);
-            ofp = new V3OutCFile(filename);
-        } else if (optSystemC()) {
-            const string filename = filenameNoExt + (source ? ".cpp" : ".h");
-            newCFile(filename, slow, source);
-            ofp = new V3OutScFile(filename);
-        } else {
-            const string filename = filenameNoExt + (source ? ".cpp" : ".h");
-            newCFile(filename, slow, source);
-            ofp = new V3OutCFile(filename);
-        }
-
-        ofp->putsHeader();
-        if (m_fileModp->isTop() && !source) {
-            ofp->puts("// DESCR"
-                      "IPTION: Verilator output: Primary design header\n");
-            ofp->puts("//\n");
-            ofp->puts("// This header should be included by all source files instantiating the "
-                      "design.\n");
-            ofp->puts("// The class here is then constructed to instantiate the design.\n");
-            ofp->puts("// See the Verilator manual for examples.\n");
-        } else {
-            if (source) {
-                ofp->puts("// DESCR"
-                          "IPTION: Verilator output: Design implementation internals\n");
-            } else {
-                ofp->puts("// DESCR"
-                          "IPTION: Verilator output: Design internal header\n");
-            }
-            ofp->puts("// See " + v3Global.opt.prefix() + ".h for the primary calling header\n");
-        }
-        return ofp;
-    }
-
-    //---------------------------------------
-    // VISITORS
-    using EmitCStmts::visit;  // Suppress hidden overloaded virtual function warning
-    virtual void visit(AstCFunc* nodep) override {
-        // TRACE_* and DPI handled elsewhere
-        if (nodep->funcType().isTrace()) return;
-        if (nodep->dpiImportPrototype()) return;
-        if (!(nodep->slow() ? m_slow : m_fast)) return;
-
-        VL_RESTORER(m_useSelfForThis);
-
-        maybeSplit();
-
-        m_blkChangeDetVec.clear();
-
-        splitSizeInc(nodep);
-
-        puts("\n");
-        m_lazyDecls.emit(nodep);
-        if (nodep->ifdef() != "") puts("#ifdef " + nodep->ifdef() + "\n");
-        if (nodep->isInline()) puts("VL_INLINE_OPT ");
-        emitCFuncHeader(nodep, m_modp, /* withScope: */ true);
-
-        // TODO perhaps better to have a new AstCCtorInit so we can pass arguments
-        // rather than requiring a string here
-        if (!nodep->ctorInits().empty()) {
-            puts(": ");
-            puts(nodep->ctorInits());
-        }
-        puts(" {\n");
-
-        if (nodep->isLoose()) {
-            m_lazyDecls.declared(nodep);  // Defined here, so no longer needs declaration
-            if (!nodep->isStatic()) {  // Standard prologue
-                m_useSelfForThis = true;
-                puts("if (false && vlSelf) {}  // Prevent unused\n");
-                if (!VN_IS(m_modp, Class)) puts(symClassAssign());
-            }
-        }
-
-        // "+" in the debug indicates a print from the model
-        puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+  ");
-        for (int i = 0; i < m_modp->level(); ++i) { puts("  "); }
-        puts(prefixNameProtect(m_modp));
-        puts(nodep->isLoose() ? "__" : "::");
-        puts(nodep->nameProtect() + "\\n\"); );\n");
-
-        if (nodep->initsp()) putsDecoration("// Variables\n");
-        for (AstNode* subnodep = nodep->argsp(); subnodep; subnodep = subnodep->nextp()) {
-            if (AstVar* varp = VN_CAST(subnodep, Var)) {
-                if (varp->isFuncReturn()) emitVarDecl(varp, "");
-            }
-        }
-        string section;
-        emitVarList(nodep->initsp(), EVL_FUNC_ALL, "", section /*ref*/);
-        emitVarList(nodep->stmtsp(), EVL_FUNC_ALL, "", section /*ref*/);
-
-        iterateAndNextNull(nodep->initsp());
-
-        if (nodep->stmtsp()) putsDecoration("// Body\n");
-        iterateAndNextNull(nodep->stmtsp());
-        if (!m_blkChangeDetVec.empty()) emitChangeDet();
-
-        if (nodep->finalsp()) putsDecoration("// Final\n");
-        iterateAndNextNull(nodep->finalsp());
-        //
-
-        if (!m_blkChangeDetVec.empty()) puts("return __req;\n");
-
-        puts("}\n");
-        if (nodep->ifdef() != "") puts("#endif  // " + nodep->ifdef() + "\n");
-    }
-
-    virtual void visit(AstMTaskBody* nodep) override {
-        VL_RESTORER(m_useSelfForThis);
-        m_useSelfForThis = true;
-        iterateChildrenConst(nodep);
-    }
-
-    void emitChangeDet() {
-        putsDecoration("// Change detection\n");
-        puts("QData __req = false;  // Logically a bool\n");  // But not because it results in
-                                                              // faster code
-        bool gotOne = false;
-        for (AstChangeDet* changep : m_blkChangeDetVec) {
-            if (changep->lhsp()) {
-                if (!gotOne) {  // Not a clocked block
-                    puts("__req |= (");
-                } else {
-                    puts("\n");
-                }
-                doubleOrDetect(changep, gotOne);
-            }
-        }
-        if (gotOne) puts(");\n");
-        if (gotOne && !v3Global.opt.protectIds()) {
-            // puts("VL_DEBUG_IF( if (__req) cout<<\"- CLOCKREQ );");
-            for (AstChangeDet* nodep : m_blkChangeDetVec) {
-                if (nodep->lhsp()) {
-                    puts("VL_DEBUG_IF( if(__req && (");
-                    bool gotOneIgnore = false;
-                    doubleOrDetect(nodep, gotOneIgnore);
-                    string varname;
-                    if (VN_IS(nodep->lhsp(), VarRef)) {
-                        varname = ": " + VN_CAST(nodep->lhsp(), VarRef)->varp()->prettyName();
-                    }
-                    puts(")) VL_DBG_MSGF(\"        CHANGE: ");
-                    puts(protect(nodep->fileline()->filename()));
-                    puts(":" + cvtToStr(nodep->fileline()->lineno()));
-                    puts(varname + "\\n\"); );\n");
-                }
-            }
-        }
-    }
-
-    virtual void visit(AstConsAssoc* nodep) override {
-        putbs(nodep->dtypep()->cType("", false, false));
-        puts("()");
-        if (nodep->defaultp()) {
-            putbs(".setDefault(");
-            iterateAndNextNull(nodep->defaultp());
-            puts(")");
-        }
-    }
-    virtual void visit(AstSetAssoc* nodep) override {
-        iterateAndNextNull(nodep->lhsp());
-        putbs(".set(");
-        iterateAndNextNull(nodep->keyp());
-        puts(", ");
-        putbs("");
-        iterateAndNextNull(nodep->valuep());
-        puts(")");
-    }
-    virtual void visit(AstConsDynArray* nodep) override {
-        putbs(nodep->dtypep()->cType("", false, false));
-        if (!nodep->lhsp()) {
-            puts("()");
-        } else {
-            puts("::cons(");
-            iterateAndNextNull(nodep->lhsp());
-            if (nodep->rhsp()) {
-                puts(", ");
-                putbs("");
-            }
-            iterateAndNextNull(nodep->rhsp());
-            puts(")");
-        }
-    }
-    virtual void visit(AstConsQueue* nodep) override {
-        putbs(nodep->dtypep()->cType("", false, false));
-        if (!nodep->lhsp()) {
-            puts("()");
-        } else {
-            puts("::cons(");
-            iterateAndNextNull(nodep->lhsp());
-            if (nodep->rhsp()) {
-                puts(", ");
-                putbs("");
-            }
-            iterateAndNextNull(nodep->rhsp());
-            puts(")");
-        }
-    }
-
-    virtual void visit(AstChangeDet* nodep) override {  //
-        m_blkChangeDetVec.push_back(nodep);
-    }
-
-    virtual void visit(AstCReset* nodep) override {
-        AstVar* varp = nodep->varrefp()->varp();
-        emitVarReset(varp);
-    }
-
-    virtual void visit(AstExecGraph* nodep) override {
-        UASSERT_OBJ(nodep == v3Global.rootp()->execGraphp(), nodep,
-                    "ExecGraph should be a singleton!");
-        // The location of the AstExecGraph within the containing _eval()
-        // function is where we want to invoke the graph and wait for it to
-        // complete. Emitting the children does just that.
-        iterateChildrenConst(nodep);
-    }
-
-    //---------------------------------------
-    // ACCESSORS
-
-    // METHODS
-    // Low level
-    void emitVarReset(AstVar* varp) {
-        AstNodeDType* const dtypep = varp->dtypep()->skipRefp();
-        const string varNameProtected
-            = VN_IS(m_modp, Class) ? varp->nameProtect() : "vlSelf->" + varp->nameProtect();
-        if (varp->isIO() && m_modp->isTop() && optSystemC()) {
-            // System C top I/O doesn't need loading, as the lower level subinst code does it.}
-        } else if (varp->isParam()) {
-            UASSERT_OBJ(varp->valuep(), varp, "No init for a param?");
-            // If a simple CONST value we initialize it using an enum
-            // If an ARRAYINIT we initialize it using an initial block similar to a signal
-            // puts("// parameter "+varp->nameProtect()+" = "+varp->valuep()->name()+"\n");
-        } else if (AstInitArray* initarp = VN_CAST(varp->valuep(), InitArray)) {
-            if (AstUnpackArrayDType* adtypep = VN_CAST(dtypep, UnpackArrayDType)) {
-                if (initarp->defaultp()) {
-                    puts("for (int __Vi=0; __Vi<" + cvtToStr(adtypep->elementsConst()));
-                    puts("; ++__Vi) {\n");
-                    emitSetVarConstant(varNameProtected + "[__Vi]",
-                                       VN_CAST(initarp->defaultp(), Const));
-                    puts("}\n");
-                }
-                const AstInitArray::KeyItemMap& mapr = initarp->map();
-                for (const auto& itr : mapr) {
-                    AstNode* valuep = itr.second->valuep();
-                    emitSetVarConstant(varNameProtected + "[" + cvtToStr(itr.first) + "]",
-                                       VN_CAST(valuep, Const));
-                }
-            } else {
-                varp->v3fatalSrc("InitArray under non-arrayed var");
-            }
-        } else {
-            puts(emitVarResetRecurse(varp, varNameProtected, dtypep, 0, ""));
-        }
-    }
-    string emitVarResetRecurse(const AstVar* varp, const string& varNameProtected,
-                               AstNodeDType* dtypep, int depth, const string& suffix) {
-        dtypep = dtypep->skipRefp();
-        AstBasicDType* basicp = dtypep->basicp();
-        // Returns string to do resetting, empty to do nothing (which caller should handle)
-        if (AstAssocArrayDType* adtypep = VN_CAST(dtypep, AssocArrayDType)) {
-            // Access std::array as C array
-            const string cvtarray = (adtypep->subDTypep()->isWide() ? ".data()" : "");
-            return emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(), depth + 1,
-                                       suffix + ".atDefault()" + cvtarray);
-        } else if (VN_IS(dtypep, ClassRefDType)) {
-            return "";  // Constructor does it
-        } else if (AstDynArrayDType* adtypep = VN_CAST(dtypep, DynArrayDType)) {
-            // Access std::array as C array
-            const string cvtarray = (adtypep->subDTypep()->isWide() ? ".data()" : "");
-            return emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(), depth + 1,
-                                       suffix + ".atDefault()" + cvtarray);
-        } else if (AstQueueDType* adtypep = VN_CAST(dtypep, QueueDType)) {
-            // Access std::array as C array
-            const string cvtarray = (adtypep->subDTypep()->isWide() ? ".data()" : "");
-            return emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(), depth + 1,
-                                       suffix + ".atDefault()" + cvtarray);
-        } else if (AstUnpackArrayDType* adtypep = VN_CAST(dtypep, UnpackArrayDType)) {
-            UASSERT_OBJ(adtypep->hi() >= adtypep->lo(), varp,
-                        "Should have swapped msb & lsb earlier.");
-            const string ivar = string("__Vi") + cvtToStr(depth);
-            const string pre = ("for (int " + ivar + "=" + cvtToStr(0) + "; " + ivar + "<"
-                                + cvtToStr(adtypep->elementsConst()) + "; ++" + ivar + ") {\n");
-            const string below = emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(),
-                                                     depth + 1, suffix + "[" + ivar + "]");
-            const string post = "}\n";
-            return below.empty() ? "" : pre + below + post;
-        } else if (basicp && basicp->keyword() == AstBasicDTypeKwd::STRING) {
-            // String's constructor deals with it
-            return "";
-        } else if (basicp) {
-            bool zeroit
-                = (varp->attrFileDescr()  // Zero so we don't core dump if never $fopen
-                   || (basicp && basicp->isZeroInit())
-                   || (v3Global.opt.underlineZero() && !varp->name().empty()
-                       && varp->name()[0] == '_')
-                   || (v3Global.opt.xInitial() == "fast" || v3Global.opt.xInitial() == "0"));
-            splitSizeInc(1);
-            if (dtypep->isWide()) {  // Handle unpacked; not basicp->isWide
-                string out;
-                if (varp->valuep()) {
-                    AstConst* const constp = VN_CAST(varp->valuep(), Const);
-                    if (!constp) varp->v3fatalSrc("non-const initializer for variable");
-                    for (int w = 0; w < varp->widthWords(); ++w) {
-                        out += varNameProtected + suffix + "[" + cvtToStr(w) + "] = ";
-                        out += cvtToStr(constp->num().edataWord(w)) + "U;\n";
-                    }
-                } else {
-                    out += zeroit ? "VL_ZERO_RESET_W(" : "VL_RAND_RESET_W(";
-                    out += cvtToStr(dtypep->widthMin());
-                    out += ", " + varNameProtected + suffix + ");\n";
-                }
-                return out;
-            } else {
-                string out = varNameProtected + suffix;
-                // If --x-initial-edge is set, we want to force an initial
-                // edge on uninitialized clocks (from 'X' to whatever the
-                // first value is). Since the class is instantiated before
-                // initial blocks are evaluated, this should not clash
-                // with any initial block settings.
-                if (zeroit || (v3Global.opt.xInitialEdge() && varp->isUsedClock())) {
-                    out += " = 0;\n";
-                } else {
-                    out += " = VL_RAND_RESET_";
-                    out += dtypep->charIQWN();
-                    out += "(" + cvtToStr(dtypep->widthMin()) + ");\n";
-                }
-                return out;
-            }
-        } else {
-            v3fatalSrc("Unknown node type in reset generator: " << varp->prettyTypeName());
-        }
-        return "";
-    }
-
     void emitSensitives();
     // Medium level
     void emitCtorImp(AstNodeModule* modp);
@@ -1867,462 +214,13 @@ class EmitCImp final : EmitCStmts {
     void maybeSplit();
 
 public:
-    EmitCImp()
-        : m_lazyDecls(*this) {}
+    EmitCImp() {}
     virtual ~EmitCImp() override = default;
     void mainImp(AstNodeModule* modp, bool slow);
     void mainInt(AstNodeModule* modp);
     void mainDoFunc(AstCFunc* nodep) { iterate(nodep); }
 };
 
-//######################################################################
-// Internal EmitCStmts
-
-void EmitCStmts::emitCtorSep(bool* firstp) {
-    if (*firstp) {
-        puts("  : ");
-        *firstp = false;
-    } else {
-        puts(", ");
-    }
-    if (ofp()->exceededWidth()) puts("\n  ");
-}
-
-void EmitCStmts::emitVarCtors(bool* firstp) {
-    if (!m_ctorVarsVec.empty()) {
-        ofp()->indentInc();
-        if (*firstp) puts("\n");
-        for (const AstVar* varp : m_ctorVarsVec) {
-            const AstBasicDType* const dtypep = VN_CAST(varp->dtypeSkipRefp(), BasicDType);
-            if (!dtypep) {
-                puts("// Skipping array: ");
-                puts(varp->nameProtect());
-                puts("\n");
-            } else if (dtypep->keyword().isMTaskState()) {
-                emitCtorSep(firstp);
-                puts(varp->nameProtect());
-                puts("(");
-                iterate(varp->valuep());
-                puts(")");
-            } else {
-                emitCtorSep(firstp);
-                puts(varp->nameProtect());
-                puts("(");
-                putsQuoted(varp->nameProtect());
-                puts(")");
-            }
-        }
-        puts("\n");
-        ofp()->indentDec();
-    }
-}
-
-bool EmitCStmts::emitSimpleOk(AstNodeMath* nodep) {
-    // Can we put out a simple (A + B) instead of VL_ADD_III(A,B)?
-    if (nodep->emitSimpleOperator() == "") return false;
-    if (nodep->isWide()) return false;
-    if (nodep->op1p()) {
-        if (nodep->op1p()->isWide()) return false;
-    }
-    if (nodep->op2p()) {
-        if (nodep->op2p()->isWide()) return false;
-    }
-    if (nodep->op3p()) {
-        if (nodep->op3p()->isWide()) return false;
-    }
-    return true;
-}
-
-void EmitCStmts::emitOpName(AstNode* nodep, const string& format, AstNode* lhsp, AstNode* rhsp,
-                            AstNode* thsp) {
-    // Look at emitOperator() format for term/uni/dual/triops,
-    // and write out appropriate text.
-    //  %n*     node
-    //   %nq      emitIQW on the [node]
-    //   %nw      width in bits
-    //   %nW      width in words
-    //   %ni      iterate
-    //  %l*     lhsp - if appropriate, then second char as above
-    //  %r*     rhsp - if appropriate, then second char as above
-    //  %t*     thsp - if appropriate, then second char as above
-    //  %k      Potential line break
-    //  %P      Wide temporary name
-    //  ,       Commas suppressed if the previous field is suppressed
-    string nextComma;
-    bool needComma = false;
-#define COMMA \
-    do { \
-        if (!nextComma.empty()) { \
-            puts(nextComma); \
-            nextComma = ""; \
-        } \
-    } while (false)
-
-    putbs("");
-    for (string::const_iterator pos = format.begin(); pos != format.end(); ++pos) {
-        if (pos[0] == ',') {
-            // Remember we need to add one, but don't do yet to avoid ",)"
-            if (needComma) {
-                if (pos[1] == ' ') {
-                    nextComma = ", ";
-                } else
-                    nextComma = ",";
-                needComma = false;
-            }
-            if (pos[1] == ' ') ++pos;  // Must do even if no nextComma
-        } else if (pos[0] == '%') {
-            ++pos;
-            bool detail = false;
-            AstNode* detailp = nullptr;
-            switch (pos[0]) {
-            case '%': puts("%"); break;
-            case 'k': putbs(""); break;
-            case 'n':
-                detail = true;
-                detailp = nodep;
-                break;
-            case 'l':
-                detail = true;
-                detailp = lhsp;
-                break;
-            case 'r':
-                detail = true;
-                detailp = rhsp;
-                break;
-            case 't':
-                detail = true;
-                detailp = thsp;
-                break;
-            case 'P':
-                if (nodep->isWide()) {
-                    UASSERT_OBJ(m_wideTempRefp, nodep,
-                                "Wide Op w/ no temp, perhaps missing op in V3EmitC?");
-                    COMMA;
-                    if (!m_wideTempRefp->selfPointer().empty()) {
-                        emitDereference(m_wideTempRefp->selfPointerProtect(m_useSelfForThis));
-                    }
-                    puts(m_wideTempRefp->varp()->nameProtect());
-                    m_wideTempRefp = nullptr;
-                    needComma = true;
-                }
-                break;
-            default: nodep->v3fatalSrc("Unknown emitOperator format code: %" << pos[0]); break;
-            }
-            if (detail) {
-                // Get next letter of %[nlrt]
-                ++pos;
-                switch (pos[0]) {
-                case 'q': emitIQW(detailp); break;
-                case 'w':
-                    COMMA;
-                    puts(cvtToStr(detailp->widthMin()));
-                    needComma = true;
-                    break;
-                case 'W':
-                    if (lhsp->isWide()) {
-                        COMMA;
-                        puts(cvtToStr(lhsp->widthWords()));
-                        needComma = true;
-                    }
-                    break;
-                case 'i':
-                    COMMA;
-                    UASSERT_OBJ(detailp, nodep, "emitOperator() references undef node");
-                    iterateAndNextNull(detailp);
-                    needComma = true;
-                    break;
-                default:
-                    nodep->v3fatalSrc("Unknown emitOperator format code: %[nlrt]" << pos[0]);
-                    break;
-                }
-            }
-        } else if (pos[0] == ')') {
-            nextComma = "";
-            puts(")");
-        } else if (pos[0] == '(') {
-            COMMA;
-            needComma = false;
-            puts("(");
-        } else {
-            // Normal text
-            if (isalnum(pos[0])) needComma = true;
-            COMMA;
-            string s;
-            s += pos[0];
-            puts(s);
-        }
-    }
-}
-
-//----------------------------------------------------------------------
-// Mid level - VISITS
-
-// We only do one display at once, so can just use static state
-
-struct EmitDispState {
-    string m_format;  // "%s" and text from user
-    std::vector<char> m_argsChar;  // Format of each argument to be printed
-    std::vector<AstNode*> m_argsp;  // Each argument to be printed
-    std::vector<string> m_argsFunc;  // Function before each argument to be printed
-    EmitDispState() { clear(); }
-    void clear() {
-        m_format = "";
-        m_argsChar.clear();
-        m_argsp.clear();
-        m_argsFunc.clear();
-    }
-    void pushFormat(const string& fmt) { m_format += fmt; }
-    void pushFormat(char fmt) { m_format += fmt; }
-    void pushArg(char fmtChar, AstNode* nodep, const string& func) {
-        m_argsChar.push_back(fmtChar);
-        m_argsp.push_back(nodep);
-        m_argsFunc.push_back(func);
-    }
-} emitDispState;
-
-void EmitCStmts::displayEmit(AstNode* nodep, bool isScan) {
-    if (emitDispState.m_format == ""
-        && VN_IS(nodep, Display)) {  // not fscanf etc, as they need to return value
-        // NOP
-    } else {
-        // Format
-        bool isStmt = false;
-        if (const AstFScanF* dispp = VN_CAST(nodep, FScanF)) {
-            isStmt = false;
-            puts("VL_FSCANF_IX(");
-            iterate(dispp->filep());
-            puts(",");
-        } else if (const AstSScanF* dispp = VN_CAST(nodep, SScanF)) {
-            isStmt = false;
-            checkMaxWords(dispp->fromp());
-            puts("VL_SSCANF_I");
-            emitIQW(dispp->fromp());
-            puts("X(");
-            puts(cvtToStr(dispp->fromp()->widthMin()));
-            puts(",");
-            iterate(dispp->fromp());
-            puts(",");
-        } else if (const AstDisplay* dispp = VN_CAST(nodep, Display)) {
-            isStmt = true;
-            if (dispp->filep()) {
-                puts("VL_FWRITEF(");
-                iterate(dispp->filep());
-                puts(",");
-            } else {
-                puts("VL_WRITEF(");
-            }
-        } else if (const AstSFormat* dispp = VN_CAST(nodep, SFormat)) {
-            isStmt = true;
-            puts("VL_SFORMAT_X(");
-            puts(cvtToStr(dispp->lhsp()->widthMin()));
-            putbs(",");
-            iterate(dispp->lhsp());
-            putbs(",");
-        } else if (VN_IS(nodep, SFormatF)) {
-            isStmt = false;
-            puts("VL_SFORMATF_NX(");
-        } else {
-            nodep->v3fatalSrc("Unknown displayEmit node type");
-        }
-        ofp()->putsQuoted(emitDispState.m_format);
-        // Arguments
-        for (unsigned i = 0; i < emitDispState.m_argsp.size(); i++) {
-            const char fmt = emitDispState.m_argsChar[i];
-            AstNode* argp = emitDispState.m_argsp[i];
-            const string func = emitDispState.m_argsFunc[i];
-            if (func != "" || argp) {
-                puts(",");
-                ofp()->indentInc();
-                ofp()->putbs("");
-                if (func != "") {
-                    puts(func);
-                } else if (argp) {
-                    const bool addrof = isScan || (fmt == '@');
-                    if (addrof) puts("&(");
-                    iterate(argp);
-                    if (!addrof) emitDatap(argp);
-                    if (addrof) puts(")");
-                }
-                ofp()->indentDec();
-            }
-        }
-        // End
-        puts(")");
-        if (isStmt) {
-            puts(";\n");
-        } else {
-            puts(" ");
-        }
-        // Prep for next
-        emitDispState.clear();
-    }
-}
-
-void EmitCStmts::displayArg(AstNode* dispp, AstNode** elistp, bool isScan, const string& vfmt,
-                            bool ignore, char fmtLetter) {
-    // Print display argument, edits elistp
-    AstNode* argp = nullptr;
-    if (!ignore) {
-        argp = *elistp;
-        // Prep for next parameter
-        *elistp = (*elistp)->nextp();
-        if (VL_UNCOVERABLE(!argp)) {
-            // expectDisplay() checks this first, so internal error if found here
-            dispp->v3error(
-                "Internal: Missing arguments for $display-like format");  // LCOV_EXCL_LINE
-            return;  // LCOV_EXCL_LINE
-        }
-        if (argp->widthMin() > VL_VALUE_STRING_MAX_WIDTH) {
-            dispp->v3error("Exceeded limit of " + cvtToStr(VL_VALUE_STRING_MAX_WIDTH)
-                           + " bits for any $display-like arguments");
-        }
-        if (argp->widthMin() > 8 && fmtLetter == 'c') {
-            // Technically legal, but surely not what the user intended.
-            argp->v3warn(WIDTH, dispp->verilogKwd() << "of %c format of > 8 bit value");
-        }
-    }
-    // string pfmt = "%"+displayFormat(argp, vfmt, fmtLetter)+fmtLetter;
-    string pfmt;
-    if ((fmtLetter == '#' || fmtLetter == 'd') && !isScan
-        && vfmt == "") {  // Size decimal output.  Spec says leading spaces, not zeros
-        const double mantissabits = ignore ? 0 : (argp->widthMin() - ((fmtLetter == 'd') ? 1 : 0));
-        // This is log10(2**mantissabits) as log2(2**mantissabits)/log2(10),
-        // + 1.0 rounding bias.
-        double dchars = mantissabits / 3.321928094887362 + 1.0;
-        if (fmtLetter == 'd') dchars++;  // space for sign
-        const int nchars = int(dchars);
-        pfmt = string("%") + cvtToStr(nchars) + fmtLetter;
-    } else {
-        pfmt = string("%") + vfmt + fmtLetter;
-    }
-    emitDispState.pushFormat(pfmt);
-    if (!ignore) {
-        if (argp->dtypep()->basicp()->keyword() == AstBasicDTypeKwd::STRING) {
-            // string in SystemVerilog is std::string in C++ which is not POD
-            emitDispState.pushArg(' ', nullptr, "-1");
-        } else {
-            emitDispState.pushArg(' ', nullptr, cvtToStr(argp->widthMin()));
-        }
-        emitDispState.pushArg(fmtLetter, argp, "");
-        if (fmtLetter == 't' || fmtLetter == '^') {
-            AstSFormatF* fmtp = nullptr;
-            if (AstDisplay* nodep = VN_CAST(dispp, Display))
-                fmtp = nodep->fmtp();
-            else if (AstSFormat* nodep = VN_CAST(dispp, SFormat))
-                fmtp = nodep->fmtp();
-            else
-                fmtp = VN_CAST(dispp, SFormatF);
-            UASSERT_OBJ(fmtp, dispp,
-                        "Use of %t must be under AstDisplay, AstSFormat, or AstSFormatF");
-            UASSERT_OBJ(!fmtp->timeunit().isNone(), fmtp, "timenunit must be set");
-            emitDispState.pushArg(' ', nullptr, cvtToStr((int)fmtp->timeunit().powerOfTen()));
-        }
-    } else {
-        emitDispState.pushArg(fmtLetter, nullptr, "");
-    }
-}
-
-void EmitCStmts::displayNode(AstNode* nodep, AstScopeName* scopenamep, const string& vformat,
-                             AstNode* exprsp, bool isScan) {
-    AstNode* elistp = exprsp;
-
-    // Convert Verilog display to C printf formats
-    //          "%0t" becomes "%d"
-    emitDispState.clear();
-    string vfmt;
-    string::const_iterator pos = vformat.begin();
-    bool inPct = false;
-    bool ignore = false;
-    for (; pos != vformat.end(); ++pos) {
-        // UINFO(1, "Parse '" << *pos << "'  IP" << inPct << " List " << cvtToHex(elistp) << endl);
-        if (!inPct && pos[0] == '%') {
-            inPct = true;
-            ignore = false;
-            vfmt = "";
-        } else if (!inPct) {  // Normal text
-            emitDispState.pushFormat(*pos);
-        } else {  // Format character
-            inPct = false;
-            switch (tolower(pos[0])) {
-            case '0':  // FALLTHRU
-            case '1':  // FALLTHRU
-            case '2':  // FALLTHRU
-            case '3':  // FALLTHRU
-            case '4':  // FALLTHRU
-            case '5':  // FALLTHRU
-            case '6':  // FALLTHRU
-            case '7':  // FALLTHRU
-            case '8':  // FALLTHRU
-            case '9':  // FALLTHRU
-            case '.':  // FALLTHRU
-            case '-':
-                // Digits, like %5d, etc.
-                vfmt += pos[0];
-                inPct = true;  // Get more digits
-                break;
-            case '%':
-                emitDispState.pushFormat("%%");  // We're printf'ing it, so need to quote the %
-                break;
-            case '*':
-                vfmt += pos[0];
-                inPct = true;  // Get more digits
-                ignore = true;
-                break;
-            // Special codes
-            case '~':
-                displayArg(nodep, &elistp, isScan, vfmt, ignore, 'd');
-                break;  // Signed decimal
-            case '@':
-                displayArg(nodep, &elistp, isScan, vfmt, ignore, '@');
-                break;  // Packed string
-            // Spec: h d o b c l
-            case 'b': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'b'); break;
-            case 'c': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'c'); break;
-            case 't': displayArg(nodep, &elistp, isScan, vfmt, ignore, 't'); break;
-            case 'd':
-                displayArg(nodep, &elistp, isScan, vfmt, ignore, '#');
-                break;  // Unsigned decimal
-            case 'o': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'o'); break;
-            case 'h':  // FALLTHRU
-            case 'x': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'x'); break;
-            case 's': displayArg(nodep, &elistp, isScan, vfmt, ignore, 's'); break;
-            case 'e': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'e'); break;
-            case 'f': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'f'); break;
-            case 'g': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'g'); break;
-            case '^': displayArg(nodep, &elistp, isScan, vfmt, ignore, '^'); break;  // Realtime
-            case 'v': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'v'); break;
-            case 'u': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'u'); break;
-            case 'z': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'z'); break;
-            case 'm': {
-                UASSERT_OBJ(scopenamep, nodep, "Display with %m but no AstScopeName");
-                const string suffix = scopenamep->scopePrettySymName();
-                if (suffix == "") {
-                    emitDispState.pushFormat("%S");
-                } else {
-                    emitDispState.pushFormat("%N");  // Add a . when needed
-                }
-                emitDispState.pushArg(' ', nullptr, "vlSymsp->name()");
-                emitDispState.pushFormat(suffix);
-                break;
-            }
-            case 'l': {
-                // Better than not compiling
-                emitDispState.pushFormat("----");
-                break;
-            }
-            default:
-                nodep->v3error("Unknown $display-like format code: '%" << pos[0] << "'");
-                break;
-            }
-        }
-    }
-    if (VL_UNCOVERABLE(elistp)) {
-        // expectFormat also checks this, and should have found it first, so internal
-        elistp->v3error("Internal: Extra arguments for $display-like format");  // LCOV_EXCL_LINE
-    }
-    displayEmit(nodep, isScan);
-}
-
 //######################################################################
 // Internal EmitC
 
@@ -2805,196 +703,6 @@ void EmitCImp::emitWrapEval() {
     splitSizeInc(10);
 }
 
-//----------------------------------------------------------------------
-// Top interface/ implementation
-
-void EmitCStmts::emitVarList(AstNode* firstp, EisWhich which, const string& prefixIfImp,
-                             string& sectionr) {
-    // Put out a list of signal declarations
-    // in order of 0:clocks, 1:vluint8, 2:vluint16, 4:vluint32, 5:vluint64, 6:wide, 7:arrays
-    // This aids cache packing and locality
-    //
-    // Largest->smallest reduces the number of pad variables.  Also
-    // experimented with alternating between large->small and small->large
-    // on successive Mtask groups, but then when a new mtask gets added may
-    // cause a huge delta.
-    //
-    // TODO: Move this sort to an earlier visitor stage.
-    VarSortMap varAnonMap;
-    VarSortMap varNonanonMap;
-
-    for (int isstatic = 1; isstatic >= 0; isstatic--) {
-        if (prefixIfImp != "" && !isstatic) continue;
-        for (AstNode* nodep = firstp; nodep; nodep = nodep->nextp()) {
-            if (const AstVar* varp = VN_CAST(nodep, Var)) {
-                bool doit = true;
-                switch (which) {
-                case EVL_CLASS_IO: doit = varp->isIO(); break;
-                case EVL_CLASS_SIG:
-                    doit = ((varp->isSignal() || varp->isClassMember()) && !varp->isIO());
-                    break;
-                case EVL_CLASS_TEMP: doit = (varp->isTemp() && !varp->isIO()); break;
-                case EVL_CLASS_PAR:
-                    doit = (varp->isParam() && !VN_IS(varp->valuep(), Const));
-                    break;
-                case EVL_CLASS_ALL: doit = true; break;
-                case EVL_FUNC_ALL: doit = true; break;
-                default: v3fatalSrc("Bad Case");
-                }
-                if (varp->isStatic() ? !isstatic : isstatic) doit = false;
-                if (doit) {
-                    const int sigbytes = varp->dtypeSkipRefp()->widthAlignBytes();
-                    int sortbytes = 9;
-                    if (varp->isUsedClock() && varp->widthMin() == 1) {
-                        sortbytes = 0;
-                    } else if (VN_IS(varp->dtypeSkipRefp(), UnpackArrayDType)) {
-                        sortbytes = 8;
-                    } else if (varp->basicp() && varp->basicp()->isOpaque()) {
-                        sortbytes = 7;
-                    } else if (varp->isScBv() || varp->isScBigUint()) {
-                        sortbytes = 6;
-                    } else if (sigbytes == 8) {
-                        sortbytes = 5;
-                    } else if (sigbytes == 4) {
-                        sortbytes = 4;
-                    } else if (sigbytes == 2) {
-                        sortbytes = 2;
-                    } else if (sigbytes == 1) {
-                        sortbytes = 1;
-                    }
-                    const bool anonOk
-                        = (v3Global.opt.compLimitMembers() != 0  // Enabled
-                           && !varp->isStatic() && !varp->isIO()  // Confusing to user
-                           && !varp->isSc()  // Aggregates can't be anon
-                           && (varp->basicp()
-                               && !varp->basicp()->isOpaque())  // Aggregates can't be anon
-                           && which != EVL_FUNC_ALL);  // Anon not legal in funcs, and gcc
-                                                       // bug free there anyhow
-                    if (anonOk) {
-                        varAnonMap[sortbytes].push_back(varp);
-                    } else {
-                        varNonanonMap[sortbytes].push_back(varp);
-                    }
-                }
-            }
-        }
-    }
-
-    if (!varAnonMap.empty() || !varNonanonMap.empty()) {
-        if (!sectionr.empty()) {
-            puts(sectionr);
-            sectionr = "";
-        }
-        VarVec anons;
-        VarVec nonanons;
-        emitVarSort(varAnonMap, &anons);
-        emitVarSort(varNonanonMap, &nonanons);
-        emitSortedVarList(anons, nonanons, prefixIfImp);
-    }
-}
-
-void EmitCStmts::emitVarSort(const VarSortMap& vmap, VarVec* sortedp) {
-    UASSERT(sortedp->empty(), "Sorted should be initially empty");
-    if (!v3Global.opt.mtasks()) {
-        // Plain old serial mode. Sort by size, from small to large,
-        // to optimize for both packing and small offsets in code.
-        for (const auto& itr : vmap) {
-            for (VarVec::const_iterator jt = itr.second.begin(); jt != itr.second.end(); ++jt) {
-                sortedp->push_back(*jt);
-            }
-        }
-        return;
-    }
-
-    // MacroTask mode.  Sort by MTask-affinity group first, size second.
-    using MTaskVarSortMap = std::map<const MTaskIdSet, VarSortMap>;
-    MTaskVarSortMap m2v;
-    for (VarSortMap::const_iterator it = vmap.begin(); it != vmap.end(); ++it) {
-        const int size_class = it->first;
-        const VarVec& vec = it->second;
-        for (const AstVar* varp : vec) { m2v[varp->mtaskIds()][size_class].push_back(varp); }
-    }
-
-    // Create a TSP sort state for each MTaskIdSet footprint
-    V3TSP::StateVec states;
-    for (MTaskVarSortMap::iterator it = m2v.begin(); it != m2v.end(); ++it) {
-        states.push_back(new EmitVarTspSorter(it->first));
-    }
-
-    // Do the TSP sort
-    V3TSP::StateVec sorted_states;
-    V3TSP::tspSort(states, &sorted_states);
-
-    for (V3TSP::StateVec::iterator it = sorted_states.begin(); it != sorted_states.end(); ++it) {
-        const EmitVarTspSorter* statep = dynamic_cast<const EmitVarTspSorter*>(*it);
-        const VarSortMap& localVmap = m2v[statep->mtaskIds()];
-        // use rbegin/rend to sort size large->small
-        for (VarSortMap::const_reverse_iterator jt = localVmap.rbegin(); jt != localVmap.rend();
-             ++jt) {
-            const VarVec& vec = jt->second;
-            for (VarVec::const_iterator kt = vec.begin(); kt != vec.end(); ++kt) {
-                sortedp->push_back(*kt);
-            }
-        }
-        VL_DO_DANGLING(delete statep, statep);
-    }
-}
-
-void EmitCStmts::emitSortedVarList(const VarVec& anons, const VarVec& nonanons,
-                                   const string& prefixIfImp) {
-    string curVarCmt;
-    // Output anons
-    {
-        const int anonMembers = anons.size();
-        const int lim = v3Global.opt.compLimitMembers();
-        int anonL3s = 1;
-        int anonL2s = 1;
-        int anonL1s = 1;
-        if (anonMembers > (lim * lim * lim)) {
-            anonL3s = (anonMembers + (lim * lim * lim) - 1) / (lim * lim * lim);
-            anonL2s = lim;
-            anonL1s = lim;
-        } else if (anonMembers > (lim * lim)) {
-            anonL2s = (anonMembers + (lim * lim) - 1) / (lim * lim);
-            anonL1s = lim;
-        } else if (anonMembers > lim) {
-            anonL1s = (anonMembers + lim - 1) / lim;
-        }
-        if (anonL1s != 1)
-            puts("// Anonymous structures to workaround compiler member-count bugs\n");
-        auto it = anons.cbegin();
-        for (int l3 = 0; l3 < anonL3s && it != anons.cend(); ++l3) {
-            if (anonL3s != 1) puts("struct {\n");
-            for (int l2 = 0; l2 < anonL2s && it != anons.cend(); ++l2) {
-                if (anonL2s != 1) puts("struct {\n");
-                for (int l1 = 0; l1 < anonL1s && it != anons.cend(); ++l1) {
-                    if (anonL1s != 1) puts("struct {\n");
-                    for (int l0 = 0; l0 < lim && it != anons.cend(); ++l0) {
-                        const AstVar* varp = *it;
-                        emitVarDecl(varp, prefixIfImp);
-                        ++it;
-                    }
-                    if (anonL1s != 1) puts("};\n");
-                }
-                if (anonL2s != 1) puts("};\n");
-            }
-            if (anonL3s != 1) puts("};\n");
-        }
-        // Leftovers, just in case off by one error somewhere above
-        for (; it != anons.end(); ++it) {
-            const AstVar* varp = *it;
-            emitVarDecl(varp, prefixIfImp);
-        }
-    }
-    // Output nonanons
-    for (const AstVar* varp : nonanons) {
-        if (varp->isIO() && varp->isSc()) { m_ctorVarsVec.push_back(varp); }
-        AstBasicDType* const basicp = varp->basicp();
-        if (basicp && basicp->keyword().isMTaskState()) { m_ctorVarsVec.push_back(varp); }
-        emitVarDecl(varp, prefixIfImp);
-    }
-}
-
 void EmitCImp::emitThreadingState() {
     ofp()->putsPrivate(false);  // Accessed from loose function
     AstExecGraph* execGraphp = v3Global.rootp()->execGraphp();
@@ -3364,11 +1072,10 @@ void EmitCImp::mainImp(AstNodeModule* modp, bool slow) {
 //######################################################################
 // Tracing routines
 
-class EmitCTrace final : EmitCStmts {
+class EmitCTrace final : EmitCFunc {
     // NODE STATE/TYPES
     // Cleared on netlist
     //  AstNode::user1() -> int.  Enum number
-    //  AstNode::user2() -> bool. Used by EmitCLazyDecls (already declared)
     AstUser1InUse m_inuser1;
 
     // MEMBERS
@@ -3376,7 +1083,6 @@ class EmitCTrace final : EmitCStmts {
     bool m_slow;  // Making slow file
     int m_enumNum = 0;  // Enumeration number (whole netlist)
     int m_baseCode = -1;  // Code of first AstTraceInc in this function
-    EmitCLazyDecls m_lazyDecls;  // Visitor for emitting lazy declarations
 
     // METHODS
     void newOutCFile(int filenum) {
@@ -3708,7 +1414,7 @@ class EmitCTrace final : EmitCStmts {
     }
 
     // VISITORS
-    using EmitCStmts::visit;  // Suppress hidden overloaded virtual function warning
+    using EmitCFunc::visit;  // Suppress hidden overloaded virtual function warning
     virtual void visit(AstNetlist* nodep) override {
         // Top module only
         iterate(nodep->topModulep());
@@ -3822,8 +1528,7 @@ class EmitCTrace final : EmitCStmts {
 
 public:
     explicit EmitCTrace(bool slow)
-        : m_slow{slow}
-        , m_lazyDecls(*this) {}
+        : m_slow{slow} {}
     virtual ~EmitCTrace() override = default;
     void main() {
         // Put out the file
@@ -3900,7 +1605,7 @@ void V3EmitC::emitcFiles() {
             V3OutCFile of(cfilep->name());
             of.puts("// DESCR"
                     "IPTION: Verilator generated C++\n");
-            EmitCStmts visitor(cfilep->tblockp(), &of, true);
+            EmitCFunc visitor(cfilep->tblockp(), &of, true);
         }
     }
 }
diff --git a/src/V3EmitCFunc.cpp b/src/V3EmitCFunc.cpp
new file mode 100644
index 000000000..f0c8e0ee5
--- /dev/null
+++ b/src/V3EmitCFunc.cpp
@@ -0,0 +1,1091 @@
+// -*- mode: C++; c-file-style: "cc-mode" -*-
+//*************************************************************************
+// DESCRIPTION: Verilator: Emit C++ for tree
+//
+// Code available from: https://verilator.org
+//
+//*************************************************************************
+//
+// Copyright 2003-2021 by Wilson Snyder. This program is free software; you
+// can redistribute it and/or modify it under the terms of either the GNU
+// Lesser General Public License Version 3 or the Perl Artistic License
+// Version 2.0.
+// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+//
+//*************************************************************************
+
+#include "config_build.h"
+#include "verilatedos.h"
+
+#include "V3Global.h"
+#include "V3String.h"
+#include "V3EmitCFunc.h"
+#include "V3TSP.h"
+
+#include <map>
+#include <vector>
+
+// We use a static char array in VL_VALUE_STRING
+constexpr int VL_VALUE_STRING_MAX_WIDTH = 8192;
+
+//######################################################################
+// Establish mtask variable sort order in mtasks mode
+
+class EmitVarTspSorter final : public V3TSP::TspStateBase {
+private:
+    // MEMBERS
+    const MTaskIdSet& m_mtaskIds;  // Mtask we're ordering
+    static unsigned s_serialNext;  // Unique ID to establish serial order
+    unsigned m_serial;  // Serial ordering
+public:
+    // CONSTRUCTORS
+    explicit EmitVarTspSorter(const MTaskIdSet& mtaskIds)
+        : m_mtaskIds(mtaskIds) {  // Cannot be {} or GCC 4.8 false warning
+        m_serial = ++s_serialNext;  // Cannot be ()/{} or GCC 4.8 false warning
+    }
+    virtual ~EmitVarTspSorter() = default;
+    // METHODS
+    virtual bool operator<(const TspStateBase& other) const override {
+        return operator<(dynamic_cast<const EmitVarTspSorter&>(other));
+    }
+    bool operator<(const EmitVarTspSorter& other) const { return m_serial < other.m_serial; }
+    const MTaskIdSet& mtaskIds() const { return m_mtaskIds; }
+    virtual int cost(const TspStateBase* otherp) const override {
+        return cost(dynamic_cast<const EmitVarTspSorter*>(otherp));
+    }
+    virtual int cost(const EmitVarTspSorter* otherp) const {
+        int cost = diffs(m_mtaskIds, otherp->m_mtaskIds);
+        cost += diffs(otherp->m_mtaskIds, m_mtaskIds);
+        return cost;
+    }
+    // Returns the number of elements in set_a that don't appear in set_b
+    static int diffs(const MTaskIdSet& set_a, const MTaskIdSet& set_b) {
+        int diffs = 0;
+        for (int i : set_a) {
+            if (set_b.find(i) == set_b.end()) ++diffs;
+        }
+        return diffs;
+    }
+};
+
+unsigned EmitVarTspSorter::s_serialNext = 0;
+
+//######################################################################
+// EmitCFunc
+
+void EmitCFunc::emitCtorSep(bool* firstp) {
+    if (*firstp) {
+        puts("  : ");
+        *firstp = false;
+    } else {
+        puts(", ");
+    }
+    if (ofp()->exceededWidth()) puts("\n  ");
+}
+
+void EmitCFunc::emitVarCtors(bool* firstp) {
+    if (!m_ctorVarsVec.empty()) {
+        ofp()->indentInc();
+        if (*firstp) puts("\n");
+        for (const AstVar* varp : m_ctorVarsVec) {
+            const AstBasicDType* const dtypep = VN_CAST(varp->dtypeSkipRefp(), BasicDType);
+            if (!dtypep) {
+                puts("// Skipping array: ");
+                puts(varp->nameProtect());
+                puts("\n");
+            } else if (dtypep->keyword().isMTaskState()) {
+                emitCtorSep(firstp);
+                puts(varp->nameProtect());
+                puts("(");
+                iterate(varp->valuep());
+                puts(")");
+            } else {
+                emitCtorSep(firstp);
+                puts(varp->nameProtect());
+                puts("(");
+                putsQuoted(varp->nameProtect());
+                puts(")");
+            }
+        }
+        puts("\n");
+        ofp()->indentDec();
+    }
+}
+
+bool EmitCFunc::emitSimpleOk(AstNodeMath* nodep) {
+    // Can we put out a simple (A + B) instead of VL_ADD_III(A,B)?
+    if (nodep->emitSimpleOperator() == "") return false;
+    if (nodep->isWide()) return false;
+    if (nodep->op1p()) {
+        if (nodep->op1p()->isWide()) return false;
+    }
+    if (nodep->op2p()) {
+        if (nodep->op2p()->isWide()) return false;
+    }
+    if (nodep->op3p()) {
+        if (nodep->op3p()->isWide()) return false;
+    }
+    return true;
+}
+
+void EmitCFunc::emitOpName(AstNode* nodep, const string& format, AstNode* lhsp, AstNode* rhsp,
+                           AstNode* thsp) {
+    // Look at emitOperator() format for term/uni/dual/triops,
+    // and write out appropriate text.
+    //  %n*     node
+    //   %nq      emitIQW on the [node]
+    //   %nw      width in bits
+    //   %nW      width in words
+    //   %ni      iterate
+    //  %l*     lhsp - if appropriate, then second char as above
+    //  %r*     rhsp - if appropriate, then second char as above
+    //  %t*     thsp - if appropriate, then second char as above
+    //  %k      Potential line break
+    //  %P      Wide temporary name
+    //  ,       Commas suppressed if the previous field is suppressed
+    string nextComma;
+    bool needComma = false;
+#define COMMA \
+    do { \
+        if (!nextComma.empty()) { \
+            puts(nextComma); \
+            nextComma = ""; \
+        } \
+    } while (false)
+
+    putbs("");
+    for (string::const_iterator pos = format.begin(); pos != format.end(); ++pos) {
+        if (pos[0] == ',') {
+            // Remember we need to add one, but don't do yet to avoid ",)"
+            if (needComma) {
+                if (pos[1] == ' ') {
+                    nextComma = ", ";
+                } else
+                    nextComma = ",";
+                needComma = false;
+            }
+            if (pos[1] == ' ') ++pos;  // Must do even if no nextComma
+        } else if (pos[0] == '%') {
+            ++pos;
+            bool detail = false;
+            AstNode* detailp = nullptr;
+            switch (pos[0]) {
+            case '%': puts("%"); break;
+            case 'k': putbs(""); break;
+            case 'n':
+                detail = true;
+                detailp = nodep;
+                break;
+            case 'l':
+                detail = true;
+                detailp = lhsp;
+                break;
+            case 'r':
+                detail = true;
+                detailp = rhsp;
+                break;
+            case 't':
+                detail = true;
+                detailp = thsp;
+                break;
+            case 'P':
+                if (nodep->isWide()) {
+                    UASSERT_OBJ(m_wideTempRefp, nodep,
+                                "Wide Op w/ no temp, perhaps missing op in V3EmitC?");
+                    COMMA;
+                    if (!m_wideTempRefp->selfPointer().empty()) {
+                        emitDereference(m_wideTempRefp->selfPointerProtect(m_useSelfForThis));
+                    }
+                    puts(m_wideTempRefp->varp()->nameProtect());
+                    m_wideTempRefp = nullptr;
+                    needComma = true;
+                }
+                break;
+            default: nodep->v3fatalSrc("Unknown emitOperator format code: %" << pos[0]); break;
+            }
+            if (detail) {
+                // Get next letter of %[nlrt]
+                ++pos;
+                switch (pos[0]) {
+                case 'q': emitIQW(detailp); break;
+                case 'w':
+                    COMMA;
+                    puts(cvtToStr(detailp->widthMin()));
+                    needComma = true;
+                    break;
+                case 'W':
+                    if (lhsp->isWide()) {
+                        COMMA;
+                        puts(cvtToStr(lhsp->widthWords()));
+                        needComma = true;
+                    }
+                    break;
+                case 'i':
+                    COMMA;
+                    UASSERT_OBJ(detailp, nodep, "emitOperator() references undef node");
+                    iterateAndNextNull(detailp);
+                    needComma = true;
+                    break;
+                default:
+                    nodep->v3fatalSrc("Unknown emitOperator format code: %[nlrt]" << pos[0]);
+                    break;
+                }
+            }
+        } else if (pos[0] == ')') {
+            nextComma = "";
+            puts(")");
+        } else if (pos[0] == '(') {
+            COMMA;
+            needComma = false;
+            puts("(");
+        } else {
+            // Normal text
+            if (isalnum(pos[0])) needComma = true;
+            COMMA;
+            string s;
+            s += pos[0];
+            puts(s);
+        }
+    }
+}
+
+// We only do one display at once, so can just use static state
+static struct EmitDispState {
+    string m_format;  // "%s" and text from user
+    std::vector<char> m_argsChar;  // Format of each argument to be printed
+    std::vector<AstNode*> m_argsp;  // Each argument to be printed
+    std::vector<string> m_argsFunc;  // Function before each argument to be printed
+    EmitDispState() { clear(); }
+    void clear() {
+        m_format = "";
+        m_argsChar.clear();
+        m_argsp.clear();
+        m_argsFunc.clear();
+    }
+    void pushFormat(const string& fmt) { m_format += fmt; }
+    void pushFormat(char fmt) { m_format += fmt; }
+    void pushArg(char fmtChar, AstNode* nodep, const string& func) {
+        m_argsChar.push_back(fmtChar);
+        m_argsp.push_back(nodep);
+        m_argsFunc.push_back(func);
+    }
+} emitDispState;
+
+void EmitCFunc::displayEmit(AstNode* nodep, bool isScan) {
+    if (emitDispState.m_format == ""
+        && VN_IS(nodep, Display)) {  // not fscanf etc, as they need to return value
+        // NOP
+    } else {
+        // Format
+        bool isStmt = false;
+        if (const AstFScanF* dispp = VN_CAST(nodep, FScanF)) {
+            isStmt = false;
+            puts("VL_FSCANF_IX(");
+            iterate(dispp->filep());
+            puts(",");
+        } else if (const AstSScanF* dispp = VN_CAST(nodep, SScanF)) {
+            isStmt = false;
+            checkMaxWords(dispp->fromp());
+            puts("VL_SSCANF_I");
+            emitIQW(dispp->fromp());
+            puts("X(");
+            puts(cvtToStr(dispp->fromp()->widthMin()));
+            puts(",");
+            iterate(dispp->fromp());
+            puts(",");
+        } else if (const AstDisplay* dispp = VN_CAST(nodep, Display)) {
+            isStmt = true;
+            if (dispp->filep()) {
+                puts("VL_FWRITEF(");
+                iterate(dispp->filep());
+                puts(",");
+            } else {
+                puts("VL_WRITEF(");
+            }
+        } else if (const AstSFormat* dispp = VN_CAST(nodep, SFormat)) {
+            isStmt = true;
+            puts("VL_SFORMAT_X(");
+            puts(cvtToStr(dispp->lhsp()->widthMin()));
+            putbs(",");
+            iterate(dispp->lhsp());
+            putbs(",");
+        } else if (VN_IS(nodep, SFormatF)) {
+            isStmt = false;
+            puts("VL_SFORMATF_NX(");
+        } else {
+            nodep->v3fatalSrc("Unknown displayEmit node type");
+        }
+        ofp()->putsQuoted(emitDispState.m_format);
+        // Arguments
+        for (unsigned i = 0; i < emitDispState.m_argsp.size(); i++) {
+            const char fmt = emitDispState.m_argsChar[i];
+            AstNode* argp = emitDispState.m_argsp[i];
+            const string func = emitDispState.m_argsFunc[i];
+            if (func != "" || argp) {
+                puts(",");
+                ofp()->indentInc();
+                ofp()->putbs("");
+                if (func != "") {
+                    puts(func);
+                } else if (argp) {
+                    const bool addrof = isScan || (fmt == '@');
+                    if (addrof) puts("&(");
+                    iterate(argp);
+                    if (!addrof) emitDatap(argp);
+                    if (addrof) puts(")");
+                }
+                ofp()->indentDec();
+            }
+        }
+        // End
+        puts(")");
+        if (isStmt) {
+            puts(";\n");
+        } else {
+            puts(" ");
+        }
+        // Prep for next
+        emitDispState.clear();
+    }
+}
+
+void EmitCFunc::displayArg(AstNode* dispp, AstNode** elistp, bool isScan, const string& vfmt,
+                           bool ignore, char fmtLetter) {
+    // Print display argument, edits elistp
+    AstNode* argp = nullptr;
+    if (!ignore) {
+        argp = *elistp;
+        // Prep for next parameter
+        *elistp = (*elistp)->nextp();
+        if (VL_UNCOVERABLE(!argp)) {
+            // expectDisplay() checks this first, so internal error if found here
+            dispp->v3error(
+                "Internal: Missing arguments for $display-like format");  // LCOV_EXCL_LINE
+            return;  // LCOV_EXCL_LINE
+        }
+        if (argp->widthMin() > VL_VALUE_STRING_MAX_WIDTH) {
+            dispp->v3error("Exceeded limit of " + cvtToStr(VL_VALUE_STRING_MAX_WIDTH)
+                           + " bits for any $display-like arguments");
+        }
+        if (argp->widthMin() > 8 && fmtLetter == 'c') {
+            // Technically legal, but surely not what the user intended.
+            argp->v3warn(WIDTH, dispp->verilogKwd() << "of %c format of > 8 bit value");
+        }
+    }
+    // string pfmt = "%"+displayFormat(argp, vfmt, fmtLetter)+fmtLetter;
+    string pfmt;
+    if ((fmtLetter == '#' || fmtLetter == 'd') && !isScan
+        && vfmt == "") {  // Size decimal output.  Spec says leading spaces, not zeros
+        const double mantissabits = ignore ? 0 : (argp->widthMin() - ((fmtLetter == 'd') ? 1 : 0));
+        // This is log10(2**mantissabits) as log2(2**mantissabits)/log2(10),
+        // + 1.0 rounding bias.
+        double dchars = mantissabits / 3.321928094887362 + 1.0;
+        if (fmtLetter == 'd') dchars++;  // space for sign
+        const int nchars = int(dchars);
+        pfmt = string("%") + cvtToStr(nchars) + fmtLetter;
+    } else {
+        pfmt = string("%") + vfmt + fmtLetter;
+    }
+    emitDispState.pushFormat(pfmt);
+    if (!ignore) {
+        if (argp->dtypep()->basicp()->keyword() == AstBasicDTypeKwd::STRING) {
+            // string in SystemVerilog is std::string in C++ which is not POD
+            emitDispState.pushArg(' ', nullptr, "-1");
+        } else {
+            emitDispState.pushArg(' ', nullptr, cvtToStr(argp->widthMin()));
+        }
+        emitDispState.pushArg(fmtLetter, argp, "");
+        if (fmtLetter == 't' || fmtLetter == '^') {
+            AstSFormatF* fmtp = nullptr;
+            if (AstDisplay* nodep = VN_CAST(dispp, Display))
+                fmtp = nodep->fmtp();
+            else if (AstSFormat* nodep = VN_CAST(dispp, SFormat))
+                fmtp = nodep->fmtp();
+            else
+                fmtp = VN_CAST(dispp, SFormatF);
+            UASSERT_OBJ(fmtp, dispp,
+                        "Use of %t must be under AstDisplay, AstSFormat, or AstSFormatF");
+            UASSERT_OBJ(!fmtp->timeunit().isNone(), fmtp, "timenunit must be set");
+            emitDispState.pushArg(' ', nullptr, cvtToStr((int)fmtp->timeunit().powerOfTen()));
+        }
+    } else {
+        emitDispState.pushArg(fmtLetter, nullptr, "");
+    }
+}
+
+void EmitCFunc::displayNode(AstNode* nodep, AstScopeName* scopenamep, const string& vformat,
+                            AstNode* exprsp, bool isScan) {
+    AstNode* elistp = exprsp;
+
+    // Convert Verilog display to C printf formats
+    //          "%0t" becomes "%d"
+    emitDispState.clear();
+    string vfmt;
+    string::const_iterator pos = vformat.begin();
+    bool inPct = false;
+    bool ignore = false;
+    for (; pos != vformat.end(); ++pos) {
+        // UINFO(1, "Parse '" << *pos << "'  IP" << inPct << " List " << cvtToHex(elistp) << endl);
+        if (!inPct && pos[0] == '%') {
+            inPct = true;
+            ignore = false;
+            vfmt = "";
+        } else if (!inPct) {  // Normal text
+            emitDispState.pushFormat(*pos);
+        } else {  // Format character
+            inPct = false;
+            switch (tolower(pos[0])) {
+            case '0':  // FALLTHRU
+            case '1':  // FALLTHRU
+            case '2':  // FALLTHRU
+            case '3':  // FALLTHRU
+            case '4':  // FALLTHRU
+            case '5':  // FALLTHRU
+            case '6':  // FALLTHRU
+            case '7':  // FALLTHRU
+            case '8':  // FALLTHRU
+            case '9':  // FALLTHRU
+            case '.':  // FALLTHRU
+            case '-':
+                // Digits, like %5d, etc.
+                vfmt += pos[0];
+                inPct = true;  // Get more digits
+                break;
+            case '%':
+                emitDispState.pushFormat("%%");  // We're printf'ing it, so need to quote the %
+                break;
+            case '*':
+                vfmt += pos[0];
+                inPct = true;  // Get more digits
+                ignore = true;
+                break;
+            // Special codes
+            case '~':
+                displayArg(nodep, &elistp, isScan, vfmt, ignore, 'd');
+                break;  // Signed decimal
+            case '@':
+                displayArg(nodep, &elistp, isScan, vfmt, ignore, '@');
+                break;  // Packed string
+            // Spec: h d o b c l
+            case 'b': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'b'); break;
+            case 'c': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'c'); break;
+            case 't': displayArg(nodep, &elistp, isScan, vfmt, ignore, 't'); break;
+            case 'd':
+                displayArg(nodep, &elistp, isScan, vfmt, ignore, '#');
+                break;  // Unsigned decimal
+            case 'o': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'o'); break;
+            case 'h':  // FALLTHRU
+            case 'x': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'x'); break;
+            case 's': displayArg(nodep, &elistp, isScan, vfmt, ignore, 's'); break;
+            case 'e': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'e'); break;
+            case 'f': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'f'); break;
+            case 'g': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'g'); break;
+            case '^': displayArg(nodep, &elistp, isScan, vfmt, ignore, '^'); break;  // Realtime
+            case 'v': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'v'); break;
+            case 'u': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'u'); break;
+            case 'z': displayArg(nodep, &elistp, isScan, vfmt, ignore, 'z'); break;
+            case 'm': {
+                UASSERT_OBJ(scopenamep, nodep, "Display with %m but no AstScopeName");
+                const string suffix = scopenamep->scopePrettySymName();
+                if (suffix == "") {
+                    emitDispState.pushFormat("%S");
+                } else {
+                    emitDispState.pushFormat("%N");  // Add a . when needed
+                }
+                emitDispState.pushArg(' ', nullptr, "vlSymsp->name()");
+                emitDispState.pushFormat(suffix);
+                break;
+            }
+            case 'l': {
+                // Better than not compiling
+                emitDispState.pushFormat("----");
+                break;
+            }
+            default:
+                nodep->v3error("Unknown $display-like format code: '%" << pos[0] << "'");
+                break;
+            }
+        }
+    }
+    if (VL_UNCOVERABLE(elistp)) {
+        // expectFormat also checks this, and should have found it first, so internal
+        elistp->v3error("Internal: Extra arguments for $display-like format");  // LCOV_EXCL_LINE
+    }
+    displayEmit(nodep, isScan);
+}
+
+void EmitCFunc::emitVarList(AstNode* firstp, EisWhich which, const string& prefixIfImp,
+                            string& sectionr) {
+    // Put out a list of signal declarations
+    // in order of 0:clocks, 1:vluint8, 2:vluint16, 4:vluint32, 5:vluint64, 6:wide, 7:arrays
+    // This aids cache packing and locality
+    //
+    // Largest->smallest reduces the number of pad variables.  Also
+    // experimented with alternating between large->small and small->large
+    // on successive Mtask groups, but then when a new mtask gets added may
+    // cause a huge delta.
+    //
+    // TODO: Move this sort to an earlier visitor stage.
+    VarSortMap varAnonMap;
+    VarSortMap varNonanonMap;
+
+    for (int isstatic = 1; isstatic >= 0; isstatic--) {
+        if (prefixIfImp != "" && !isstatic) continue;
+        for (AstNode* nodep = firstp; nodep; nodep = nodep->nextp()) {
+            if (const AstVar* varp = VN_CAST(nodep, Var)) {
+                bool doit = true;
+                switch (which) {
+                case EVL_CLASS_IO: doit = varp->isIO(); break;
+                case EVL_CLASS_SIG:
+                    doit = ((varp->isSignal() || varp->isClassMember()) && !varp->isIO());
+                    break;
+                case EVL_CLASS_TEMP: doit = (varp->isTemp() && !varp->isIO()); break;
+                case EVL_CLASS_PAR:
+                    doit = (varp->isParam() && !VN_IS(varp->valuep(), Const));
+                    break;
+                case EVL_CLASS_ALL: doit = true; break;
+                case EVL_FUNC_ALL: doit = true; break;
+                default: v3fatalSrc("Bad Case");
+                }
+                if (varp->isStatic() ? !isstatic : isstatic) doit = false;
+                if (doit) {
+                    const int sigbytes = varp->dtypeSkipRefp()->widthAlignBytes();
+                    int sortbytes = 9;
+                    if (varp->isUsedClock() && varp->widthMin() == 1) {
+                        sortbytes = 0;
+                    } else if (VN_IS(varp->dtypeSkipRefp(), UnpackArrayDType)) {
+                        sortbytes = 8;
+                    } else if (varp->basicp() && varp->basicp()->isOpaque()) {
+                        sortbytes = 7;
+                    } else if (varp->isScBv() || varp->isScBigUint()) {
+                        sortbytes = 6;
+                    } else if (sigbytes == 8) {
+                        sortbytes = 5;
+                    } else if (sigbytes == 4) {
+                        sortbytes = 4;
+                    } else if (sigbytes == 2) {
+                        sortbytes = 2;
+                    } else if (sigbytes == 1) {
+                        sortbytes = 1;
+                    }
+                    const bool anonOk
+                        = (v3Global.opt.compLimitMembers() != 0  // Enabled
+                           && !varp->isStatic() && !varp->isIO()  // Confusing to user
+                           && !varp->isSc()  // Aggregates can't be anon
+                           && (varp->basicp()
+                               && !varp->basicp()->isOpaque())  // Aggregates can't be anon
+                           && which != EVL_FUNC_ALL);  // Anon not legal in funcs, and gcc
+                                                       // bug free there anyhow
+                    if (anonOk) {
+                        varAnonMap[sortbytes].push_back(varp);
+                    } else {
+                        varNonanonMap[sortbytes].push_back(varp);
+                    }
+                }
+            }
+        }
+    }
+
+    if (!varAnonMap.empty() || !varNonanonMap.empty()) {
+        if (!sectionr.empty()) {
+            puts(sectionr);
+            sectionr = "";
+        }
+        VarVec anons;
+        VarVec nonanons;
+        emitVarSort(varAnonMap, &anons);
+        emitVarSort(varNonanonMap, &nonanons);
+        emitSortedVarList(anons, nonanons, prefixIfImp);
+    }
+}
+
+void EmitCFunc::emitVarSort(const VarSortMap& vmap, VarVec* sortedp) {
+    UASSERT(sortedp->empty(), "Sorted should be initially empty");
+    if (!v3Global.opt.mtasks()) {
+        // Plain old serial mode. Sort by size, from small to large,
+        // to optimize for both packing and small offsets in code.
+        for (const auto& itr : vmap) {
+            for (VarVec::const_iterator jt = itr.second.begin(); jt != itr.second.end(); ++jt) {
+                sortedp->push_back(*jt);
+            }
+        }
+        return;
+    }
+
+    // MacroTask mode.  Sort by MTask-affinity group first, size second.
+    using MTaskVarSortMap = std::map<const MTaskIdSet, VarSortMap>;
+    MTaskVarSortMap m2v;
+    for (VarSortMap::const_iterator it = vmap.begin(); it != vmap.end(); ++it) {
+        const int size_class = it->first;
+        const VarVec& vec = it->second;
+        for (const AstVar* varp : vec) { m2v[varp->mtaskIds()][size_class].push_back(varp); }
+    }
+
+    // Create a TSP sort state for each MTaskIdSet footprint
+    V3TSP::StateVec states;
+    for (MTaskVarSortMap::iterator it = m2v.begin(); it != m2v.end(); ++it) {
+        states.push_back(new EmitVarTspSorter(it->first));
+    }
+
+    // Do the TSP sort
+    V3TSP::StateVec sorted_states;
+    V3TSP::tspSort(states, &sorted_states);
+
+    for (V3TSP::StateVec::iterator it = sorted_states.begin(); it != sorted_states.end(); ++it) {
+        const EmitVarTspSorter* statep = dynamic_cast<const EmitVarTspSorter*>(*it);
+        const VarSortMap& localVmap = m2v[statep->mtaskIds()];
+        // use rbegin/rend to sort size large->small
+        for (VarSortMap::const_reverse_iterator jt = localVmap.rbegin(); jt != localVmap.rend();
+             ++jt) {
+            const VarVec& vec = jt->second;
+            for (VarVec::const_iterator kt = vec.begin(); kt != vec.end(); ++kt) {
+                sortedp->push_back(*kt);
+            }
+        }
+        VL_DO_DANGLING(delete statep, statep);
+    }
+}
+
+void EmitCFunc::emitSortedVarList(const VarVec& anons, const VarVec& nonanons,
+                                  const string& prefixIfImp) {
+    string curVarCmt;
+    // Output anons
+    {
+        const int anonMembers = anons.size();
+        const int lim = v3Global.opt.compLimitMembers();
+        int anonL3s = 1;
+        int anonL2s = 1;
+        int anonL1s = 1;
+        if (anonMembers > (lim * lim * lim)) {
+            anonL3s = (anonMembers + (lim * lim * lim) - 1) / (lim * lim * lim);
+            anonL2s = lim;
+            anonL1s = lim;
+        } else if (anonMembers > (lim * lim)) {
+            anonL2s = (anonMembers + (lim * lim) - 1) / (lim * lim);
+            anonL1s = lim;
+        } else if (anonMembers > lim) {
+            anonL1s = (anonMembers + lim - 1) / lim;
+        }
+        if (anonL1s != 1)
+            puts("// Anonymous structures to workaround compiler member-count bugs\n");
+        auto it = anons.cbegin();
+        for (int l3 = 0; l3 < anonL3s && it != anons.cend(); ++l3) {
+            if (anonL3s != 1) puts("struct {\n");
+            for (int l2 = 0; l2 < anonL2s && it != anons.cend(); ++l2) {
+                if (anonL2s != 1) puts("struct {\n");
+                for (int l1 = 0; l1 < anonL1s && it != anons.cend(); ++l1) {
+                    if (anonL1s != 1) puts("struct {\n");
+                    for (int l0 = 0; l0 < lim && it != anons.cend(); ++l0) {
+                        const AstVar* varp = *it;
+                        emitVarDecl(varp, prefixIfImp);
+                        ++it;
+                    }
+                    if (anonL1s != 1) puts("};\n");
+                }
+                if (anonL2s != 1) puts("};\n");
+            }
+            if (anonL3s != 1) puts("};\n");
+        }
+        // Leftovers, just in case off by one error somewhere above
+        for (; it != anons.end(); ++it) {
+            const AstVar* varp = *it;
+            emitVarDecl(varp, prefixIfImp);
+        }
+    }
+    // Output nonanons
+    for (const AstVar* varp : nonanons) {
+        if (varp->isIO() && varp->isSc()) { m_ctorVarsVec.push_back(varp); }
+        AstBasicDType* const basicp = varp->basicp();
+        if (basicp && basicp->keyword().isMTaskState()) { m_ctorVarsVec.push_back(varp); }
+        emitVarDecl(varp, prefixIfImp);
+    }
+}
+
+void EmitCFunc::emitIntFuncDecls(AstNodeModule* modp, bool inClassBody) {
+    std::vector<const AstCFunc*> funcsp;
+
+    for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
+        if (const AstCFunc* funcp = VN_CAST(nodep, CFunc)) {
+            if (funcp->dpiImportPrototype())  // DPI import prototypes are declared in __Dpi.h
+                continue;
+            if (funcp->isMethod() != inClassBody)  // Only methods go inside class
+                continue;
+            if (funcp->isMethod() && funcp->isLoose())  // Loose methods are declared lazily
+                continue;
+            funcsp.push_back(funcp);
+        }
+    }
+
+    stable_sort(funcsp.begin(), funcsp.end(), [](const AstNode* ap, const AstNode* bp) {  //
+        return ap->name() < bp->name();
+    });
+
+    for (const AstCFunc* funcp : funcsp) {
+        if (inClassBody) ofp()->putsPrivate(funcp->declPrivate());
+        emitCFuncDecl(funcp, modp);
+    }
+}
+
+void EmitCFunc::emitCCallArgs(AstNodeCCall* nodep) {
+    bool comma = false;
+    if (nodep->funcp()->isLoose() && !nodep->funcp()->isStatic()) {
+        UASSERT_OBJ(!nodep->selfPointer().empty(), nodep,
+                    "Call to loose method without self pointer");
+        puts(nodep->selfPointerProtect(m_useSelfForThis));
+        comma = true;
+    }
+    if (!nodep->argTypes().empty()) {
+        if (comma) puts(", ");
+        puts(nodep->argTypes());
+        comma = true;
+    }
+    for (AstNode* subnodep = nodep->argsp(); subnodep; subnodep = subnodep->nextp()) {
+        if (comma) puts(", ");
+        iterate(subnodep);
+        comma = true;
+    }
+}
+
+void EmitCFunc::emitDereference(const string& pointer) {
+    if (pointer[0] == '(' && pointer[1] == '&') {
+        // remove "address of" followed by immediate dereference
+        // Note: this relies on only the form '(&OBJECT)' being used by Verilator
+        puts(pointer.substr(2, pointer.length() - 3));
+        puts(".");
+    } else {
+        puts(pointer);
+        puts("->");
+    }
+}
+
+void EmitCFunc::emitCvtPackStr(AstNode* nodep) {
+    if (const AstConst* constp = VN_CAST(nodep, Const)) {
+        putbs("std::string(");
+        putsQuoted(constp->num().toString());
+        puts(")");
+    } else {
+        putbs("VL_CVT_PACK_STR_N");
+        emitIQW(nodep);
+        puts("(");
+        if (nodep->isWide()) {
+            // Note argument width, not node width (which is always 32)
+            puts(cvtToStr(nodep->widthWords()));
+            puts(", ");
+        }
+        iterateAndNextNull(nodep);
+        puts(")");
+    }
+}
+
+void EmitCFunc::emitCvtWideArray(AstNode* nodep, AstNode* fromp) {
+    putbs("VL_CVT_W_A(");
+    iterate(nodep);
+    puts(", ");
+    iterate(fromp);
+    putbs(".atDefault()");  // Not accessed; only to get the proper type of values
+    puts(")");
+}
+
+void EmitCFunc::emitConstant(AstConst* nodep, AstVarRef* assigntop, const string& assignString) {
+    // Put out constant set to the specified variable, or given variable in a string
+    if (nodep->num().isFourState()) {
+        nodep->v3warn(E_UNSUPPORTED, "Unsupported: 4-state numbers in this context");
+    } else if (nodep->num().isString()) {
+        putbs("std::string(");
+        putsQuoted(nodep->num().toString());
+        puts(")");
+    } else if (nodep->isWide()) {
+        int upWidth = nodep->num().widthMin();
+        int chunks = 0;
+        if (upWidth > EMITC_NUM_CONSTW * VL_EDATASIZE) {
+            // Output e.g. 8 words in groups of e.g. 8
+            chunks = (upWidth - 1) / (EMITC_NUM_CONSTW * VL_EDATASIZE);
+            upWidth %= (EMITC_NUM_CONSTW * VL_EDATASIZE);
+            if (upWidth == 0) upWidth = (EMITC_NUM_CONSTW * VL_EDATASIZE);
+        }
+        {  // Upper e.g. 8 words
+            if (chunks) {
+                putbs("VL_CONSTHI_W_");
+                puts(cvtToStr(VL_WORDS_I(upWidth)));
+                puts("X(");
+                puts(cvtToStr(nodep->widthMin()));
+                puts(",");
+                puts(cvtToStr(chunks * EMITC_NUM_CONSTW * VL_EDATASIZE));
+            } else {
+                putbs("VL_CONST_W_");
+                puts(cvtToStr(VL_WORDS_I(upWidth)));
+                puts("X(");
+                puts(cvtToStr(nodep->widthMin()));
+            }
+            puts(",");
+            if (!assigntop) {
+                puts(assignString);
+            } else if (VN_IS(assigntop, VarRef)) {
+                if (!assigntop->selfPointer().empty()) {
+                    emitDereference(assigntop->selfPointerProtect(m_useSelfForThis));
+                }
+                puts(assigntop->varp()->nameProtect());
+            } else {
+                iterateAndNextNull(assigntop);
+            }
+            for (int word = VL_WORDS_I(upWidth) - 1; word >= 0; word--) {
+                // Only 32 bits - llx + long long here just to appease CPP format warning
+                ofp()->printf(",0x%08" VL_PRI64 "x",
+                              static_cast<vluint64_t>(
+                                  nodep->num().edataWord(word + chunks * EMITC_NUM_CONSTW)));
+            }
+            puts(")");
+        }
+        for (chunks--; chunks >= 0; chunks--) {
+            puts(";\n");
+            putbs("VL_CONSTLO_W_");
+            puts(cvtToStr(EMITC_NUM_CONSTW));
+            puts("X(");
+            puts(cvtToStr(chunks * EMITC_NUM_CONSTW * VL_EDATASIZE));
+            puts(",");
+            if (!assigntop) {
+                puts(assignString);
+            } else if (VN_IS(assigntop, VarRef)) {
+                if (!assigntop->selfPointer().empty()) {
+                    emitDereference(assigntop->selfPointerProtect(m_useSelfForThis));
+                }
+                puts(assigntop->varp()->nameProtect());
+            } else {
+                iterateAndNextNull(assigntop);
+            }
+            for (int word = EMITC_NUM_CONSTW - 1; word >= 0; word--) {
+                // Only 32 bits - llx + long long here just to appease CPP format warning
+                ofp()->printf(",0x%08" VL_PRI64 "x",
+                              static_cast<vluint64_t>(
+                                  nodep->num().edataWord(word + chunks * EMITC_NUM_CONSTW)));
+            }
+            puts(")");
+        }
+    } else if (nodep->isDouble()) {
+        if (int(nodep->num().toDouble()) == nodep->num().toDouble()
+            && nodep->num().toDouble() < 1000 && nodep->num().toDouble() > -1000) {
+            ofp()->printf("%3.1f", nodep->num().toDouble());  // Force decimal point
+        } else {
+            // Not %g as will not always put in decimal point, so not obvious to compiler
+            // is a real number
+            ofp()->printf("%.17e", nodep->num().toDouble());
+        }
+    } else if (nodep->isQuad()) {
+        vluint64_t num = nodep->toUQuad();
+        if (num < 10) {
+            ofp()->printf("%" VL_PRI64 "uULL", num);
+        } else {
+            ofp()->printf("0x%" VL_PRI64 "xULL", num);
+        }
+    } else {
+        uint32_t num = nodep->toUInt();
+        // Only 32 bits - llx + long long here just to appease CPP format warning
+        if (num < 10) {
+            puts(cvtToStr(num));
+        } else {
+            ofp()->printf("0x%" VL_PRI64 "x", static_cast<vluint64_t>(num));
+        }
+        // If signed, we'll do our own functions
+        // But must be here, or <= comparisons etc may end up signed
+        puts("U");
+    }
+}
+
+void EmitCFunc::emitSetVarConstant(const string& assignString, AstConst* constp) {
+    if (!constp->isWide()) {
+        puts(assignString);
+        puts(" = ");
+    }
+    emitConstant(constp, nullptr, assignString);
+    puts(";\n");
+}
+
+void EmitCFunc::emitVarReset(AstVar* varp) {
+    AstNodeDType* const dtypep = varp->dtypep()->skipRefp();
+    const string varNameProtected
+        = VN_IS(m_modp, Class) ? varp->nameProtect() : "vlSelf->" + varp->nameProtect();
+    if (varp->isIO() && m_modp->isTop() && optSystemC()) {
+        // System C top I/O doesn't need loading, as the lower level subinst code does it.}
+    } else if (varp->isParam()) {
+        UASSERT_OBJ(varp->valuep(), varp, "No init for a param?");
+        // If a simple CONST value we initialize it using an enum
+        // If an ARRAYINIT we initialize it using an initial block similar to a signal
+        // puts("// parameter "+varp->nameProtect()+" = "+varp->valuep()->name()+"\n");
+    } else if (AstInitArray* initarp = VN_CAST(varp->valuep(), InitArray)) {
+        if (AstUnpackArrayDType* adtypep = VN_CAST(dtypep, UnpackArrayDType)) {
+            if (initarp->defaultp()) {
+                puts("for (int __Vi=0; __Vi<" + cvtToStr(adtypep->elementsConst()));
+                puts("; ++__Vi) {\n");
+                emitSetVarConstant(varNameProtected + "[__Vi]",
+                                   VN_CAST(initarp->defaultp(), Const));
+                puts("}\n");
+            }
+            const AstInitArray::KeyItemMap& mapr = initarp->map();
+            for (const auto& itr : mapr) {
+                AstNode* valuep = itr.second->valuep();
+                emitSetVarConstant(varNameProtected + "[" + cvtToStr(itr.first) + "]",
+                                   VN_CAST(valuep, Const));
+            }
+        } else {
+            varp->v3fatalSrc("InitArray under non-arrayed var");
+        }
+    } else {
+        puts(emitVarResetRecurse(varp, varNameProtected, dtypep, 0, ""));
+    }
+}
+
+string EmitCFunc::emitVarResetRecurse(const AstVar* varp, const string& varNameProtected,
+                                      AstNodeDType* dtypep, int depth, const string& suffix) {
+    dtypep = dtypep->skipRefp();
+    AstBasicDType* basicp = dtypep->basicp();
+    // Returns string to do resetting, empty to do nothing (which caller should handle)
+    if (AstAssocArrayDType* adtypep = VN_CAST(dtypep, AssocArrayDType)) {
+        // Access std::array as C array
+        const string cvtarray = (adtypep->subDTypep()->isWide() ? ".data()" : "");
+        return emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(), depth + 1,
+                                   suffix + ".atDefault()" + cvtarray);
+    } else if (VN_IS(dtypep, ClassRefDType)) {
+        return "";  // Constructor does it
+    } else if (AstDynArrayDType* adtypep = VN_CAST(dtypep, DynArrayDType)) {
+        // Access std::array as C array
+        const string cvtarray = (adtypep->subDTypep()->isWide() ? ".data()" : "");
+        return emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(), depth + 1,
+                                   suffix + ".atDefault()" + cvtarray);
+    } else if (AstQueueDType* adtypep = VN_CAST(dtypep, QueueDType)) {
+        // Access std::array as C array
+        const string cvtarray = (adtypep->subDTypep()->isWide() ? ".data()" : "");
+        return emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(), depth + 1,
+                                   suffix + ".atDefault()" + cvtarray);
+    } else if (AstUnpackArrayDType* adtypep = VN_CAST(dtypep, UnpackArrayDType)) {
+        UASSERT_OBJ(adtypep->hi() >= adtypep->lo(), varp,
+                    "Should have swapped msb & lsb earlier.");
+        const string ivar = string("__Vi") + cvtToStr(depth);
+        const string pre = ("for (int " + ivar + "=" + cvtToStr(0) + "; " + ivar + "<"
+                            + cvtToStr(adtypep->elementsConst()) + "; ++" + ivar + ") {\n");
+        const string below = emitVarResetRecurse(varp, varNameProtected, adtypep->subDTypep(),
+                                                 depth + 1, suffix + "[" + ivar + "]");
+        const string post = "}\n";
+        return below.empty() ? "" : pre + below + post;
+    } else if (basicp && basicp->keyword() == AstBasicDTypeKwd::STRING) {
+        // String's constructor deals with it
+        return "";
+    } else if (basicp) {
+        bool zeroit
+            = (varp->attrFileDescr()  // Zero so we don't core dump if never $fopen
+               || (basicp && basicp->isZeroInit())
+               || (v3Global.opt.underlineZero() && !varp->name().empty() && varp->name()[0] == '_')
+               || (v3Global.opt.xInitial() == "fast" || v3Global.opt.xInitial() == "0"));
+        splitSizeInc(1);
+        if (dtypep->isWide()) {  // Handle unpacked; not basicp->isWide
+            string out;
+            if (varp->valuep()) {
+                AstConst* const constp = VN_CAST(varp->valuep(), Const);
+                if (!constp) varp->v3fatalSrc("non-const initializer for variable");
+                for (int w = 0; w < varp->widthWords(); ++w) {
+                    out += varNameProtected + suffix + "[" + cvtToStr(w) + "] = ";
+                    out += cvtToStr(constp->num().edataWord(w)) + "U;\n";
+                }
+            } else {
+                out += zeroit ? "VL_ZERO_RESET_W(" : "VL_RAND_RESET_W(";
+                out += cvtToStr(dtypep->widthMin());
+                out += ", " + varNameProtected + suffix + ");\n";
+            }
+            return out;
+        } else {
+            string out = varNameProtected + suffix;
+            // If --x-initial-edge is set, we want to force an initial
+            // edge on uninitialized clocks (from 'X' to whatever the
+            // first value is). Since the class is instantiated before
+            // initial blocks are evaluated, this should not clash
+            // with any initial block settings.
+            if (zeroit || (v3Global.opt.xInitialEdge() && varp->isUsedClock())) {
+                out += " = 0;\n";
+            } else {
+                out += " = VL_RAND_RESET_";
+                out += dtypep->charIQWN();
+                out += "(" + cvtToStr(dtypep->widthMin()) + ");\n";
+            }
+            return out;
+        }
+    } else {
+        v3fatalSrc("Unknown node type in reset generator: " << varp->prettyTypeName());
+    }
+    return "";
+}
+
+void EmitCFunc::doubleOrDetect(AstChangeDet* changep, bool& gotOne) {
+    // cppcheck-suppress variableScope
+    static int s_addDoubleOr = 10;  // Determined experimentally as best
+    if (!changep->rhsp()) {
+        if (!gotOne) {
+            gotOne = true;
+        } else {
+            puts(" | ");
+        }
+        iterateAndNextNull(changep->lhsp());
+    } else {
+        AstNode* lhsp = changep->lhsp();
+        AstNode* rhsp = changep->rhsp();
+        UASSERT_OBJ(VN_IS(lhsp, VarRef) || VN_IS(lhsp, ArraySel), changep, "Not ref?");
+        UASSERT_OBJ(VN_IS(rhsp, VarRef) || VN_IS(rhsp, ArraySel), changep, "Not ref?");
+        for (int word = 0; word < (changep->lhsp()->isWide() ? changep->lhsp()->widthWords() : 1);
+             ++word) {
+            if (!gotOne) {
+                gotOne = true;
+                s_addDoubleOr = 10;
+                puts("(");
+            } else if (--s_addDoubleOr == 0) {
+                puts("|| (");
+                s_addDoubleOr = 10;
+            } else {
+                puts(" | (");
+            }
+            iterateAndNextNull(changep->lhsp());
+            if (changep->lhsp()->isWide()) puts("[" + cvtToStr(word) + "]");
+            if (changep->lhsp()->isDouble()) {
+                puts(" != ");
+            } else {
+                puts(" ^ ");
+            }
+            iterateAndNextNull(changep->rhsp());
+            if (changep->lhsp()->isWide()) puts("[" + cvtToStr(word) + "]");
+            puts(")");
+        }
+    }
+}
+
+void EmitCFunc::emitChangeDet() {
+    putsDecoration("// Change detection\n");
+    puts("QData __req = false;  // Logically a bool\n");  // But not because it results in
+    // faster code
+    bool gotOne = false;
+    for (AstChangeDet* changep : m_blkChangeDetVec) {
+        if (changep->lhsp()) {
+            if (!gotOne) {  // Not a clocked block
+                puts("__req |= (");
+            } else {
+                puts("\n");
+            }
+            doubleOrDetect(changep, gotOne);
+        }
+    }
+    if (gotOne) puts(");\n");
+    if (gotOne && !v3Global.opt.protectIds()) {
+        // puts("VL_DEBUG_IF( if (__req) cout<<\"- CLOCKREQ );");
+        for (AstChangeDet* nodep : m_blkChangeDetVec) {
+            if (nodep->lhsp()) {
+                puts("VL_DEBUG_IF( if(__req && (");
+                bool gotOneIgnore = false;
+                doubleOrDetect(nodep, gotOneIgnore);
+                string varname;
+                if (VN_IS(nodep->lhsp(), VarRef)) {
+                    varname = ": " + VN_CAST(nodep->lhsp(), VarRef)->varp()->prettyName();
+                }
+                puts(")) VL_DBG_MSGF(\"        CHANGE: ");
+                puts(protect(nodep->fileline()->filename()));
+                puts(":" + cvtToStr(nodep->fileline()->lineno()));
+                puts(varname + "\\n\"); );\n");
+            }
+        }
+    }
+}
diff --git a/src/V3EmitCFunc.h b/src/V3EmitCFunc.h
new file mode 100644
index 000000000..42e8f7daf
--- /dev/null
+++ b/src/V3EmitCFunc.h
@@ -0,0 +1,1258 @@
+// -*- mode: C++; c-file-style: "cc-mode" -*-
+//*************************************************************************
+// DESCRIPTION: Verilator: Emit C++ for tree
+//
+// Code available from: https://verilator.org
+//
+//*************************************************************************
+//
+// Copyright 2003-2021 by Wilson Snyder. This program is free software; you
+// can redistribute it and/or modify it under the terms of either the GNU
+// Lesser General Public License Version 3 or the Perl Artistic License
+// Version 2.0.
+// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+//
+//*************************************************************************
+
+#ifndef VERILATOR_V3EMITCFUNC_H_
+#define VERILATOR_V3EMITCFUNC_H_
+
+#include "config_build.h"
+#include "verilatedos.h"
+
+#include "V3Global.h"
+#include "V3EmitCBase.h"
+
+#include <algorithm>
+#include <map>
+#include <unordered_set>
+#include <vector>
+
+// Number of VL_CONST_W_*X's in verilated.h (IE VL_CONST_W_8X is last)
+constexpr int EMITC_NUM_CONSTW = 8;
+
+//######################################################################
+// Emit lazy forward declarations
+
+class EmitCLazyDecls final : public AstNVisitor {
+    // NODE STATE/TYPES
+    //  AstNode::user2() -> bool. Already emitted decl for symbols.
+    AstUser2InUse m_inuser2;
+
+    // MEMBERS
+    std::unordered_set<string> m_emittedManually;  // Set of names already declared manually.
+    EmitCBaseVisitor& m_emitter;  // For access to file output
+    bool m_needsBlankLine = false;  // Emit blank line if any declarations were emitted (cosmetic)
+
+    // METHODS
+    void lazyDeclare(AstCFunc* funcp) {
+        // Already declared in this compilation unit
+        if (funcp->user2SetOnce()) return;
+        // Check if this kind of function is lazily declared
+        if (!(funcp->isMethod() && funcp->isLoose()) && !funcp->dpiImportPrototype()) return;
+        // Already declared manually
+        if (m_emittedManually.count(funcp->nameProtect())) return;
+        // Needs lazy declaration, emit one
+        m_emitter.emitCFuncDecl(funcp, VN_CAST_CONST(funcp->user4p(), NodeModule),
+                                funcp->dpiImportPrototype());
+        m_needsBlankLine = true;
+    }
+
+    void lazyDeclareConstPoolVar(AstVar* varp) {
+        if (varp->user2SetOnce()) return;  // Already declared
+        const string nameProtect
+            = m_emitter.topClassName() + "__ConstPool__" + varp->nameProtect();
+        m_emitter.puts("extern const ");
+        m_emitter.puts(varp->dtypep()->cType(nameProtect, false, false));
+        m_emitter.puts(";\n");
+        m_needsBlankLine = true;
+    }
+
+    // VISITORS
+    virtual void visit(AstNodeCCall* nodep) override {
+        lazyDeclare(nodep->funcp());
+        iterateChildren(nodep);
+    }
+
+    virtual void visit(AstAddrOfCFunc* nodep) override {
+        lazyDeclare(nodep->funcp());
+        iterateChildren(nodep);
+    }
+
+    virtual void visit(AstVarRef* nodep) override {
+        AstVar* const varp = nodep->varp();
+        // Only constant pool symbols are lazy declared for now ...
+        if (EmitCBaseVisitor::isConstPoolMod(varp->user4p())) { lazyDeclareConstPoolVar(varp); }
+    }
+
+    virtual void visit(AstNode* nodep) override { iterateChildrenConst(nodep); }
+
+    VL_DEBUG_FUNC;
+
+public:
+    EmitCLazyDecls(EmitCBaseVisitor& emitter)
+        : m_emitter(emitter) {}
+    void emit(AstNode* nodep) {
+        m_needsBlankLine = false;
+        iterateChildrenConst(nodep);
+        if (m_needsBlankLine) m_emitter.puts("\n");
+    }
+    void emit(const string& prefix, const string& name, const string& suffix) {
+        m_emittedManually.insert(name);
+        m_emitter.ensureNewLine();
+        m_emitter.puts(prefix);
+        m_emitter.puts(name);
+        m_emitter.puts(suffix);
+        m_emitter.ensureNewLine();
+    }
+    void declared(AstCFunc* nodep) { nodep->user2SetOnce(); }
+    void reset() { AstNode::user2ClearTree(); }
+};
+
+//######################################################################
+// Emit statements and math operators
+
+class EmitCFunc VL_NOT_FINAL : public EmitCBaseVisitor {
+private:
+    using VarVec = std::vector<const AstVar*>;
+    using VarSortMap = std::map<int, VarVec>;  // Map size class to VarVec
+
+    bool m_suppressSemi;
+    AstVarRef* m_wideTempRefp;  // Variable that _WW macros should be setting
+    VarVec m_ctorVarsVec;  // All variables in constructor order
+    int m_labelNum;  // Next label number
+    int m_splitSize;  // # of cfunc nodes placed into output file
+    int m_splitFilenum;  // File number being created, 0 = primary
+    bool m_inUC = false;  // Inside an AstUCStmt or AstUCMath
+    std::vector<AstChangeDet*> m_blkChangeDetVec;  // All encountered changes in block
+
+protected:
+    EmitCLazyDecls m_lazyDecls;  // Visitor for emitting lazy declarations
+    bool m_useSelfForThis = false;  // Replace "this" with "vlSelf"
+    AstNodeModule* m_modp = nullptr;  // Current module being emitted
+
+public:
+    // METHODS
+    VL_DEBUG_FUNC;  // Declare debug()
+
+    // ACCESSORS
+    int splitFilenumInc() {
+        m_splitSize = 0;
+        return ++m_splitFilenum;
+    }
+    int splitSize() const { return m_splitSize; }
+    void splitSizeInc(int count) { m_splitSize += count; }
+    void splitSizeInc(AstNode* nodep) { splitSizeInc(EmitCBaseCounterVisitor(nodep).count()); }
+    bool splitNeeded() const {
+        return v3Global.opt.outputSplit() && splitSize() >= v3Global.opt.outputSplit();
+    }
+
+    // METHODS
+    void displayNode(AstNode* nodep, AstScopeName* scopenamep, const string& vformat,
+                     AstNode* exprsp, bool isScan);
+    void displayEmit(AstNode* nodep, bool isScan);
+    void displayArg(AstNode* dispp, AstNode** elistp, bool isScan, const string& vfmt, bool ignore,
+                    char fmtLetter);
+
+    enum EisWhich : uint8_t {
+        EVL_CLASS_IO,
+        EVL_CLASS_SIG,
+        EVL_CLASS_TEMP,
+        EVL_CLASS_PAR,
+        EVL_CLASS_ALL,
+        EVL_FUNC_ALL
+    };
+    void emitVarList(AstNode* firstp, EisWhich which, const string& prefixIfImp, string& sectionr);
+    static void emitVarSort(const VarSortMap& vmap, VarVec* sortedp);
+    void emitSortedVarList(const VarVec& anons, const VarVec& nonanons, const string& prefixIfImp);
+    void emitVarCtors(bool* firstp);
+    void emitCtorSep(bool* firstp);
+    bool emitSimpleOk(AstNodeMath* nodep);
+    void emitIQW(AstNode* nodep) {
+        // Other abbrevs: "C"har, "S"hort, "F"loat, "D"ouble, stri"N"g
+        puts(nodep->dtypep()->charIQWN());
+    }
+    void emitScIQW(AstVar* nodep) {
+        UASSERT_OBJ(nodep->isSc(), nodep, "emitting SystemC operator on non-SC variable");
+        // clang-format off
+        puts(nodep->isScBigUint() ? "SB"
+             : nodep->isScUint()  ? "SU"
+             : nodep->isScBv()    ? "SW"
+             : (nodep->isScQuad() ? "SQ" : "SI"));
+        // clang-format on
+    }
+    void emitDatap(AstNode* nodep) {
+        // When passing to a function with va_args the compiler doesn't
+        // know need a pointer so when wide, need to look inside VlWide
+        if (nodep->isWide()) puts(".data()");
+    }
+    void emitOpName(AstNode* nodep, const string& format, AstNode* lhsp, AstNode* rhsp,
+                    AstNode* thsp);
+    void emitIntFuncDecls(AstNodeModule* modp, bool inClassBody);
+    void emitCCallArgs(AstNodeCCall* nodep);
+    void emitDereference(const string& pointer);
+    void emitCvtPackStr(AstNode* nodep);
+    void emitCvtWideArray(AstNode* nodep, AstNode* fromp);
+    void emitConstant(AstConst* nodep, AstVarRef* assigntop, const string& assignString);
+    void emitSetVarConstant(const string& assignString, AstConst* constp);
+    void emitVarReset(AstVar* varp);
+    string emitVarResetRecurse(const AstVar* varp, const string& varNameProtected,
+                               AstNodeDType* dtypep, int depth, const string& suffix);
+    void doubleOrDetect(AstChangeDet* changep, bool& gotOne);
+    void emitChangeDet();
+
+    // VISITORS
+    virtual void visit(AstCFunc* nodep) override {
+        VL_RESTORER(m_useSelfForThis);
+
+        m_blkChangeDetVec.clear();
+
+        splitSizeInc(nodep);
+
+        puts("\n");
+        m_lazyDecls.emit(nodep);
+        if (nodep->ifdef() != "") puts("#ifdef " + nodep->ifdef() + "\n");
+        if (nodep->isInline()) puts("VL_INLINE_OPT ");
+        emitCFuncHeader(nodep, m_modp, /* withScope: */ true);
+
+        // TODO perhaps better to have a new AstCCtorInit so we can pass arguments
+        // rather than requiring a string here
+        if (!nodep->ctorInits().empty()) {
+            puts(": ");
+            puts(nodep->ctorInits());
+        }
+        puts(" {\n");
+
+        if (nodep->isLoose()) {
+            m_lazyDecls.declared(nodep);  // Defined here, so no longer needs declaration
+            if (!nodep->isStatic()) {  // Standard prologue
+                m_useSelfForThis = true;
+                puts("if (false && vlSelf) {}  // Prevent unused\n");
+                if (!VN_IS(m_modp, Class)) puts(symClassAssign());
+            }
+        }
+
+        // "+" in the debug indicates a print from the model
+        puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+  ");
+        for (int i = 0; i < m_modp->level(); ++i) { puts("  "); }
+        puts(prefixNameProtect(m_modp));
+        puts(nodep->isLoose() ? "__" : "::");
+        puts(nodep->nameProtect() + "\\n\"); );\n");
+
+        if (nodep->initsp()) putsDecoration("// Variables\n");
+        for (AstNode* subnodep = nodep->argsp(); subnodep; subnodep = subnodep->nextp()) {
+            if (AstVar* varp = VN_CAST(subnodep, Var)) {
+                if (varp->isFuncReturn()) emitVarDecl(varp, "");
+            }
+        }
+        string section;
+        emitVarList(nodep->initsp(), EVL_FUNC_ALL, "", section /*ref*/);
+        emitVarList(nodep->stmtsp(), EVL_FUNC_ALL, "", section /*ref*/);
+
+        iterateAndNextNull(nodep->initsp());
+
+        if (nodep->stmtsp()) putsDecoration("// Body\n");
+        iterateAndNextNull(nodep->stmtsp());
+        if (!m_blkChangeDetVec.empty()) emitChangeDet();
+
+        if (nodep->finalsp()) putsDecoration("// Final\n");
+        iterateAndNextNull(nodep->finalsp());
+        //
+
+        if (!m_blkChangeDetVec.empty()) puts("return __req;\n");
+
+        puts("}\n");
+        if (nodep->ifdef() != "") puts("#endif  // " + nodep->ifdef() + "\n");
+    }
+
+    virtual void visit(AstNodeAssign* nodep) override {
+        bool paren = true;
+        bool decind = false;
+        if (AstSel* selp = VN_CAST(nodep->lhsp(), Sel)) {
+            if (selp->widthMin() == 1) {
+                putbs("VL_ASSIGNBIT_");
+                emitIQW(selp->fromp());
+                if (nodep->rhsp()->isAllOnesV()) {
+                    puts("O(");
+                } else {
+                    puts("I(");
+                }
+                puts(cvtToStr(nodep->widthMin()) + ",");
+                iterateAndNextNull(selp->lsbp());
+                puts(", ");
+                iterateAndNextNull(selp->fromp());
+                puts(", ");
+            } else {
+                putbs("VL_ASSIGNSEL_");
+                emitIQW(selp->fromp());
+                puts("II");
+                emitIQW(nodep->rhsp());
+                puts("(");
+                puts(cvtToStr(selp->fromp()->widthMin()) + ",");
+                puts(cvtToStr(nodep->widthMin()) + ",");
+                iterateAndNextNull(selp->lsbp());
+                puts(", ");
+                iterateAndNextNull(selp->fromp());
+                puts(", ");
+            }
+        } else if (AstGetcRefN* selp = VN_CAST(nodep->lhsp(), GetcRefN)) {
+            iterateAndNextNull(selp->lhsp());
+            puts(" = ");
+            putbs("VL_PUTC_N(");
+            iterateAndNextNull(selp->lhsp());
+            puts(", ");
+            iterateAndNextNull(selp->rhsp());
+            puts(", ");
+        } else if (AstVar* varp = AstVar::scVarRecurse(nodep->lhsp())) {
+            putbs("VL_ASSIGN_");  // Set a systemC variable
+            emitScIQW(varp);
+            emitIQW(nodep);
+            puts("(");
+            puts(cvtToStr(nodep->widthMin()) + ",");
+            iterateAndNextNull(nodep->lhsp());
+            puts(", ");
+        } else if (AstVar* varp = AstVar::scVarRecurse(nodep->rhsp())) {
+            putbs("VL_ASSIGN_");  // Get a systemC variable
+            emitIQW(nodep);
+            emitScIQW(varp);
+            puts("(");
+            puts(cvtToStr(nodep->widthMin()) + ",");
+            iterateAndNextNull(nodep->lhsp());
+            puts(", ");
+        } else if (nodep->isWide() && VN_IS(nodep->lhsp(), VarRef)  //
+                   && !VN_IS(nodep->rhsp(), CMath)  //
+                   && !VN_IS(nodep->rhsp(), CMethodHard)  //
+                   && !VN_IS(nodep->rhsp(), VarRef)  //
+                   && !VN_IS(nodep->rhsp(), AssocSel)  //
+                   && !VN_IS(nodep->rhsp(), ArraySel)) {
+            // Wide functions assign into the array directly, don't need separate assign statement
+            m_wideTempRefp = VN_CAST(nodep->lhsp(), VarRef);
+            paren = false;
+        } else if (nodep->isWide()) {
+            putbs("VL_ASSIGN_W(");
+            puts(cvtToStr(nodep->widthMin()) + ",");
+            iterateAndNextNull(nodep->lhsp());
+            puts(", ");
+        } else {
+            paren = false;
+            iterateAndNextNull(nodep->lhsp());
+            puts(" ");
+            ofp()->blockInc();
+            decind = true;
+            if (!VN_IS(nodep->rhsp(), Const)) ofp()->putBreak();
+            puts("= ");
+        }
+        iterateAndNextNull(nodep->rhsp());
+        if (paren) puts(")");
+        if (decind) ofp()->blockDec();
+        if (!m_suppressSemi) puts(";\n");
+    }
+    virtual void visit(AstAlwaysPublic*) override {}
+    virtual void visit(AstAssocSel* nodep) override {
+        iterateAndNextNull(nodep->fromp());
+        putbs(".at(");
+        AstAssocArrayDType* adtypep = VN_CAST(nodep->fromp()->dtypep(), AssocArrayDType);
+        UASSERT_OBJ(adtypep, nodep, "Associative select on non-associative type");
+        if (adtypep->keyDTypep()->isWide()) {
+            emitCvtWideArray(nodep->bitp(), nodep->fromp());
+        } else {
+            iterateAndNextNull(nodep->bitp());
+        }
+        puts(")");
+    }
+    virtual void visit(AstNodeCCall* nodep) override {
+        const AstCFunc* const funcp = nodep->funcp();
+        if (AstCMethodCall* ccallp = VN_CAST(nodep, CMethodCall)) {
+            UASSERT_OBJ(!funcp->isLoose(), nodep, "Loose method called via AstCMethodCall");
+            // make this a Ast type for future opt
+            iterate(ccallp->fromp());
+            putbs("->");
+            puts(funcp->nameProtect());
+        } else if (funcp->dpiImportPrototype()) {
+            // Calling DPI import
+            puts(funcp->name());
+        } else if (funcp->isProperMethod() && funcp->isStatic()) {
+            // Call static method via the containing class
+            puts(prefixNameProtect(funcp->user4p()) + "::");
+            puts(funcp->nameProtect());
+        } else if (VN_IS(funcp->user4p(), Class) && funcp->user4p() != m_modp) {
+            // Calling superclass method
+            puts(prefixNameProtect(funcp->user4p()) + "::");
+            puts(funcp->nameProtect());
+        } else if (funcp->isLoose()) {
+            // Calling loose method
+            puts(funcNameProtect(funcp));
+        } else {
+            // Calling regular method/function
+            if (!nodep->selfPointer().empty()) {
+                emitDereference(nodep->selfPointerProtect(m_useSelfForThis));
+            }
+            puts(funcp->nameProtect());
+        }
+        puts("(");
+        emitCCallArgs(nodep);
+        if (VN_IS(nodep->backp(), NodeMath) || VN_IS(nodep->backp(), CReturn)) {
+            // We should have a separate CCall for math and statement usage, but...
+            puts(")");
+        } else {
+            puts(");\n");
+        }
+    }
+    virtual void visit(AstCMethodHard* nodep) override {
+        iterate(nodep->fromp());
+        puts(".");
+        puts(nodep->nameProtect());
+        puts("(");
+        bool comma = false;
+        for (AstNode* subnodep = nodep->pinsp(); subnodep; subnodep = subnodep->nextp()) {
+            if (comma) puts(", ");
+            // handle wide arguments to the queues
+            if (VN_IS(nodep->fromp()->dtypep(), QueueDType) && subnodep->dtypep()->isWide()) {
+                emitCvtWideArray(subnodep, nodep->fromp());
+            } else {
+                iterate(subnodep);
+            }
+            comma = true;
+        }
+        puts(")");
+        // Some are statements some are math.
+        if (nodep->isStatement()) puts(";\n");
+        UASSERT_OBJ(!nodep->isStatement() || VN_IS(nodep->dtypep(), VoidDType), nodep,
+                    "Statement of non-void data type");
+    }
+    virtual void visit(AstLambdaArgRef* nodep) override { putbs(nodep->nameProtect()); }
+    virtual void visit(AstWith* nodep) override {
+        // With uses a C++11 lambda
+        putbs("[=](");
+        if (auto* argrefp = nodep->indexArgRefp()) {
+            putbs(argrefp->dtypep()->cType(argrefp->nameProtect(), false, false));
+            puts(",");
+        }
+        if (auto* argrefp = nodep->valueArgRefp()) {
+            putbs(argrefp->dtypep()->cType(argrefp->nameProtect(), false, false));
+        }
+        // Probably fragile, V3Task may need to convert to a AstCReturn
+        puts(") { return ");
+        iterateAndNextNull(nodep->exprp());
+        puts("; }\n");
+    }
+    virtual void visit(AstIntfRef* nodep) override {
+        putsQuoted(VIdProtect::protectWordsIf(AstNode::vcdName(nodep->name()), nodep->protect()));
+    }
+    virtual void visit(AstNodeCase* nodep) override {  // LCOV_EXCL_LINE
+        // In V3Case...
+        nodep->v3fatalSrc("Case statements should have been reduced out");
+    }
+    virtual void visit(AstComment* nodep) override {
+        string at;
+        if (nodep->showAt()) {
+            at = " at " + nodep->fileline()->ascii();
+            // If protecting, passthru less information about the design
+            if (!v3Global.opt.protectIds()) return;
+        }
+        if (!(nodep->protect() && v3Global.opt.protectIds())) {
+            putsDecoration(string("// ") + nodep->name() + at + "\n");
+        }
+        iterateChildren(nodep);
+    }
+    virtual void visit(AstCoverDecl* nodep) override {
+        puts("vlSelf->__vlCoverInsert(");  // As Declared in emitCoverageDecl
+        puts("&(vlSymsp->__Vcoverage[");
+        puts(cvtToStr(nodep->dataDeclThisp()->binNum()));
+        puts("])");
+        // If this isn't the first instantiation of this module under this
+        // design, don't really count the bucket, and rely on verilator_cov to
+        // aggregate counts.  This is because Verilator combines all
+        // hierarchies itself, and if verilator_cov also did it, you'd end up
+        // with (number-of-instant) times too many counts in this bin.
+        puts(", first");  // Enable, passed from __Vconfigure parameter
+        puts(", ");
+        putsQuoted(protect(nodep->fileline()->filename()));
+        puts(", ");
+        puts(cvtToStr(nodep->fileline()->lineno()));
+        puts(", ");
+        puts(cvtToStr(nodep->offset() + nodep->fileline()->firstColumn()));
+        puts(", ");
+        putsQuoted((!nodep->hier().empty() ? "." : "")
+                   + protectWordsIf(nodep->hier(), nodep->protect()));
+        puts(", ");
+        putsQuoted(protectWordsIf(nodep->page(), nodep->protect()));
+        puts(", ");
+        putsQuoted(protectWordsIf(nodep->comment(), nodep->protect()));
+        puts(", ");
+        putsQuoted(nodep->linescov());
+        puts(");\n");
+    }
+    virtual void visit(AstCoverInc* nodep) override {
+        if (v3Global.opt.threads()) {
+            puts("vlSymsp->__Vcoverage[");
+            puts(cvtToStr(nodep->declp()->dataDeclThisp()->binNum()));
+            puts("].fetch_add(1, std::memory_order_relaxed);\n");
+        } else {
+            puts("++(vlSymsp->__Vcoverage[");
+            puts(cvtToStr(nodep->declp()->dataDeclThisp()->binNum()));
+            puts("]);\n");
+        }
+    }
+    virtual void visit(AstCReturn* nodep) override {
+        puts("return (");
+        iterateAndNextNull(nodep->lhsp());
+        puts(");\n");
+    }
+    virtual void visit(AstDisplay* nodep) override {
+        string text = nodep->fmtp()->text();
+        if (nodep->addNewline()) text += "\n";
+        displayNode(nodep, nodep->fmtp()->scopeNamep(), text, nodep->fmtp()->exprsp(), false);
+    }
+    virtual void visit(AstDumpCtl* nodep) override {
+        switch (nodep->ctlType()) {
+        case VDumpCtlType::FILE:
+            puts("vlSymsp->_vm_contextp__->dumpfile(");
+            emitCvtPackStr(nodep->exprp());
+            puts(");\n");
+            break;
+        case VDumpCtlType::VARS:
+            // We ignore number of levels to dump in exprp()
+            if (v3Global.opt.trace()) {
+                puts("vlSymsp->TOPp->_traceDumpOpen();\n");
+            } else {
+                puts("VL_PRINTF_MT(\"-Info: ");
+                puts(protect(nodep->fileline()->filename()));
+                puts(":");
+                puts(cvtToStr(nodep->fileline()->lineno()));
+                puts(": $dumpvar ignored, as Verilated without --trace");
+                puts("\\n\");\n");
+            }
+            break;
+        case VDumpCtlType::ALL:
+            // $dumpall currently ignored
+            break;
+        case VDumpCtlType::FLUSH:
+            // $dumpall currently ignored; would need rework of VCD single thread,
+            // or flag we pass-through to next eval() iteration
+            break;
+        case VDumpCtlType::LIMIT:
+            // $dumplimit currently ignored
+            break;
+        case VDumpCtlType::OFF:
+            // Currently ignored as both Vcd and Fst do not support them, as would need "X" dump
+            break;
+        case VDumpCtlType::ON:
+            // Currently ignored as $dumpoff is also ignored
+            break;
+        default: nodep->v3fatalSrc("Bad case, unexpected " << nodep->ctlType().ascii());
+        }
+    }
+    virtual void visit(AstScopeName* nodep) override {
+        // For use under AstCCalls for dpiImports.  ScopeNames under
+        // displays are handled in AstDisplay
+        if (!nodep->dpiExport()) {
+            // this is where the DPI import context scope is set
+            const string scope = nodep->scopeDpiName();
+            putbs("(&(vlSymsp->" + protect("__Vscope_" + scope) + "))");
+        }
+    }
+    virtual void visit(AstSFormat* nodep) override {
+        displayNode(nodep, nodep->fmtp()->scopeNamep(), nodep->fmtp()->text(),
+                    nodep->fmtp()->exprsp(), false);
+    }
+    virtual void visit(AstSFormatF* nodep) override {
+        displayNode(nodep, nodep->scopeNamep(), nodep->text(), nodep->exprsp(), false);
+    }
+    virtual void visit(AstFScanF* nodep) override {
+        displayNode(nodep, nullptr, nodep->text(), nodep->exprsp(), true);
+    }
+    virtual void visit(AstSScanF* nodep) override {
+        displayNode(nodep, nullptr, nodep->text(), nodep->exprsp(), true);
+    }
+    virtual void visit(AstValuePlusArgs* nodep) override {
+        puts("VL_VALUEPLUSARGS_IN");
+        emitIQW(nodep->outp());
+        puts("(");
+        puts(cvtToStr(nodep->outp()->widthMin()));
+        puts(", ");
+        emitCvtPackStr(nodep->searchp());
+        puts(", ");
+        putbs("");
+        iterateAndNextNull(nodep->outp());
+        puts(")");
+    }
+    virtual void visit(AstTestPlusArgs* nodep) override {
+        puts("VL_TESTPLUSARGS_I(");
+        putsQuoted(nodep->text());
+        puts(")");
+    }
+    virtual void visit(AstFError* nodep) override {
+        puts("VL_FERROR_IN(");
+        iterateAndNextNull(nodep->filep());
+        putbs(", ");
+        iterateAndNextNull(nodep->strp());
+        puts(")");
+    }
+    virtual void visit(AstFGetS* nodep) override {
+        checkMaxWords(nodep);
+        emitOpName(nodep, nodep->emitC(), nodep->lhsp(), nodep->rhsp(), nullptr);
+    }
+
+    void checkMaxWords(AstNode* nodep) {
+        if (nodep->widthWords() > VL_TO_STRING_MAX_WORDS) {
+            nodep->v3error(
+                "String of "
+                << nodep->width()
+                << " bits exceeds hardcoded limit VL_TO_STRING_MAX_WORDS in verilatedos.h");
+        }
+    }
+    virtual void visit(AstFOpen* nodep) override {
+        iterateAndNextNull(nodep->filep());
+        puts(" = VL_FOPEN_NN(");
+        emitCvtPackStr(nodep->filenamep());
+        putbs(", ");
+        if (nodep->modep()->width() > 4 * 8)
+            nodep->modep()->v3error("$fopen mode should be <= 4 characters");
+        emitCvtPackStr(nodep->modep());
+        puts(");\n");
+    }
+    virtual void visit(AstFOpenMcd* nodep) override {
+        iterateAndNextNull(nodep->filep());
+        puts(" = VL_FOPEN_MCD_N(");
+        emitCvtPackStr(nodep->filenamep());
+        puts(");\n");
+    }
+    virtual void visit(AstNodeReadWriteMem* nodep) override {
+        puts(nodep->cFuncPrefixp());
+        puts("N(");
+        puts(nodep->isHex() ? "true" : "false");
+        putbs(", ");
+        // Need real storage width
+        puts(cvtToStr(nodep->memp()->dtypep()->subDTypep()->widthMin()));
+        uint32_t array_lo = 0;
+        {
+            const AstVarRef* varrefp = VN_CAST(nodep->memp(), VarRef);
+            if (!varrefp) {
+                nodep->v3error(nodep->verilogKwd() << " loading non-variable");
+            } else if (VN_IS(varrefp->varp()->dtypeSkipRefp(), AssocArrayDType)) {
+                // nodep->memp() below will when verilated code is compiled create a C++ template
+            } else if (const AstUnpackArrayDType* adtypep
+                       = VN_CAST(varrefp->varp()->dtypeSkipRefp(), UnpackArrayDType)) {
+                putbs(", ");
+                puts(cvtToStr(varrefp->varp()->dtypep()->arrayUnpackedElements()));
+                array_lo = adtypep->lo();
+                putbs(", ");
+                puts(cvtToStr(array_lo));
+            } else {
+                nodep->v3error(nodep->verilogKwd()
+                               << " loading other than unpacked/associative-array variable");
+            }
+        }
+        putbs(", ");
+        emitCvtPackStr(nodep->filenamep());
+        putbs(", ");
+        {
+            const bool need_ptr = !VN_IS(nodep->memp()->dtypep(), AssocArrayDType);
+            if (need_ptr) puts(" &(");
+            iterateAndNextNull(nodep->memp());
+            if (need_ptr) puts(")");
+        }
+        putbs(", ");
+        if (nodep->lsbp()) {
+            iterateAndNextNull(nodep->lsbp());
+        } else {
+            puts(cvtToStr(array_lo));
+        }
+        putbs(", ");
+        if (nodep->msbp()) {
+            iterateAndNextNull(nodep->msbp());
+        } else {
+            puts("~0ULL");
+        }
+        puts(");\n");
+    }
+    virtual void visit(AstFClose* nodep) override {
+        puts("VL_FCLOSE_I(");
+        iterateAndNextNull(nodep->filep());
+        puts("); ");
+        iterateAndNextNull(nodep->filep());  // For safety, so user doesn't later WRITE with it.
+        puts(" = 0;\n");
+    }
+    virtual void visit(AstFFlush* nodep) override {
+        if (!nodep->filep()) {
+            puts("Verilated::runFlushCallbacks();\n");
+        } else {
+            puts("if (");
+            iterateAndNextNull(nodep->filep());
+            puts(") { VL_FFLUSH_I(");
+            iterateAndNextNull(nodep->filep());
+            puts("); }\n");
+        }
+    }
+    virtual void visit(AstFSeek* nodep) override {
+        puts("(VL_FSEEK_I(");
+        iterateAndNextNull(nodep->filep());
+        puts(",");
+        iterateAndNextNull(nodep->offset());
+        puts(",");
+        iterateAndNextNull(nodep->operation());
+        puts(") == -1 ? -1 : 0)");
+    }
+    virtual void visit(AstFTell* nodep) override {
+        puts("VL_FTELL_I(");
+        iterateAndNextNull(nodep->filep());
+        puts(")");
+    }
+    virtual void visit(AstFRewind* nodep) override {
+        puts("(VL_FSEEK_I(");
+        iterateAndNextNull(nodep->filep());
+        puts(", 0, 0) == -1 ? -1 : 0)");
+    }
+    virtual void visit(AstFRead* nodep) override {
+        puts("VL_FREAD_I(");
+        puts(cvtToStr(nodep->memp()->widthMin()));  // Need real storage width
+        putbs(",");
+        uint32_t array_lo = 0;
+        uint32_t array_size = 0;
+        {
+            const AstVarRef* varrefp = VN_CAST(nodep->memp(), VarRef);
+            if (!varrefp) {
+                nodep->v3error(nodep->verilogKwd() << " loading non-variable");
+            } else if (VN_CAST(varrefp->varp()->dtypeSkipRefp(), BasicDType)) {
+            } else if (const AstUnpackArrayDType* adtypep
+                       = VN_CAST(varrefp->varp()->dtypeSkipRefp(), UnpackArrayDType)) {
+                array_lo = adtypep->lo();
+                array_size = adtypep->elementsConst();
+            } else {
+                nodep->v3error(nodep->verilogKwd()
+                               << " loading other than unpacked-array variable");
+            }
+        }
+        puts(cvtToStr(array_lo));
+        putbs(",");
+        puts(cvtToStr(array_size));
+        putbs(", ");
+        puts("&(");
+        iterateAndNextNull(nodep->memp());
+        puts(")");
+        putbs(", ");
+        iterateAndNextNull(nodep->filep());
+        putbs(", ");
+        if (nodep->startp()) {
+            iterateAndNextNull(nodep->startp());
+        } else {
+            puts(cvtToStr(array_lo));
+        }
+        putbs(", ");
+        if (nodep->countp()) {
+            iterateAndNextNull(nodep->countp());
+        } else {
+            puts(cvtToStr(array_size));
+        }
+        puts(")");
+    }
+    virtual void visit(AstSysFuncAsTask* nodep) override {
+        if (!nodep->lhsp()->isWide()) puts("(void)");
+        iterateAndNextNull(nodep->lhsp());
+        if (!nodep->lhsp()->isWide()) puts(";");
+    }
+    virtual void visit(AstSystemT* nodep) override {
+        puts("(void)VL_SYSTEM_I");
+        emitIQW(nodep->lhsp());
+        puts("(");
+        if (nodep->lhsp()->isWide()) {
+            puts(cvtToStr(nodep->lhsp()->widthWords()));
+            putbs(", ");
+        }
+        checkMaxWords(nodep->lhsp());
+        iterateAndNextNull(nodep->lhsp());
+        puts(");\n");
+    }
+    virtual void visit(AstSystemF* nodep) override {
+        puts("VL_SYSTEM_I");
+        emitIQW(nodep->lhsp());
+        puts("(");
+        if (nodep->lhsp()->isWide()) {
+            puts(cvtToStr(nodep->lhsp()->widthWords()));
+            putbs(", ");
+        }
+        checkMaxWords(nodep->lhsp());
+        iterateAndNextNull(nodep->lhsp());
+        puts(")");
+    }
+    virtual void visit(AstJumpBlock* nodep) override {
+        nodep->labelNum(++m_labelNum);
+        puts("{\n");  // Make it visually obvious label jumps outside these
+        iterateAndNextNull(nodep->stmtsp());
+        iterateAndNextNull(nodep->endStmtsp());
+        puts("}\n");
+    }
+    virtual void visit(AstJumpGo* nodep) override {
+        puts("goto __Vlabel" + cvtToStr(nodep->labelp()->blockp()->labelNum()) + ";\n");
+    }
+    virtual void visit(AstJumpLabel* nodep) override {
+        puts("__Vlabel" + cvtToStr(nodep->blockp()->labelNum()) + ": ;\n");
+    }
+    virtual void visit(AstWhile* nodep) override {
+        iterateAndNextNull(nodep->precondsp());
+        puts("while (");
+        iterateAndNextNull(nodep->condp());
+        puts(") {\n");
+        iterateAndNextNull(nodep->bodysp());
+        iterateAndNextNull(nodep->incsp());
+        iterateAndNextNull(nodep->precondsp());  // Need to recompute before next loop
+        puts("}\n");
+    }
+    virtual void visit(AstNodeIf* nodep) override {
+        puts("if (");
+        if (!nodep->branchPred().unknown()) {
+            puts(nodep->branchPred().ascii());
+            puts("(");
+        }
+        iterateAndNextNull(nodep->condp());
+        if (!nodep->branchPred().unknown()) puts(")");
+        puts(") {\n");
+        iterateAndNextNull(nodep->ifsp());
+        puts("}");
+        if (!nodep->elsesp()) {
+            puts("\n");
+        } else {
+            if (VN_IS(nodep->elsesp(), NodeIf) && !nodep->elsesp()->nextp()) {
+                puts(" else ");
+                iterateAndNextNull(nodep->elsesp());
+            } else {
+                puts(" else {\n");
+                iterateAndNextNull(nodep->elsesp());
+                puts("}\n");
+            }
+        }
+    }
+    virtual void visit(AstExprStmt* nodep) override {
+        // GCC allows compound statements in expressions, but this is not standard.
+        // So we use an immediate-evaluation lambda and comma operator
+        putbs("([&]() {\n");
+        iterateAndNextNull(nodep->stmtsp());
+        puts("}(), ");
+        iterateAndNextNull(nodep->resultp());
+        puts(")");
+    }
+    virtual void visit(AstStop* nodep) override {
+        puts("VL_STOP_MT(");
+        putsQuoted(protect(nodep->fileline()->filename()));
+        puts(", ");
+        puts(cvtToStr(nodep->fileline()->lineno()));
+        puts(", \"\"");
+        puts(");\n");
+    }
+    virtual void visit(AstFinish* nodep) override {
+        puts("VL_FINISH_MT(");
+        putsQuoted(protect(nodep->fileline()->filename()));
+        puts(", ");
+        puts(cvtToStr(nodep->fileline()->lineno()));
+        puts(", \"\");\n");
+    }
+    virtual void visit(AstPrintTimeScale* nodep) override {
+        puts("VL_PRINTTIMESCALE(");
+        putsQuoted(protect(nodep->name()));
+        puts(", ");
+        putsQuoted(nodep->timeunit().ascii());
+        puts(", vlSymsp->_vm_contextp__);\n");
+    }
+    virtual void visit(AstRand* nodep) override {
+        emitOpName(nodep, nodep->emitC(), nodep->seedp(), nullptr, nullptr);
+    }
+    virtual void visit(AstTime* nodep) override {
+        puts("VL_TIME_UNITED_Q(");
+        if (nodep->timeunit().isNone()) nodep->v3fatalSrc("$time has no units");
+        puts(cvtToStr(nodep->timeunit().multiplier()
+                      / v3Global.rootp()->timeprecision().multiplier()));
+        puts(")");
+    }
+    virtual void visit(AstTimeD* nodep) override {
+        puts("VL_TIME_UNITED_D(");
+        if (nodep->timeunit().isNone()) nodep->v3fatalSrc("$realtime has no units");
+        puts(cvtToStr(nodep->timeunit().multiplier()
+                      / v3Global.rootp()->timeprecision().multiplier()));
+        puts(")");
+    }
+    virtual void visit(AstTimeFormat* nodep) override {
+        puts("VL_TIMEFORMAT_IINI(");
+        iterateAndNextNull(nodep->unitsp());
+        puts(", ");
+        iterateAndNextNull(nodep->precisionp());
+        puts(", ");
+        emitCvtPackStr(nodep->suffixp());
+        puts(", ");
+        iterateAndNextNull(nodep->widthp());
+        puts(", vlSymsp->_vm_contextp__);\n");
+    }
+    virtual void visit(AstNodeSimpleText* nodep) override {
+        const string text = m_inUC && m_useSelfForThis
+                                ? VString::replaceWord(nodep->text(), "this", "vlSelf")
+                                : nodep->text();
+        if (nodep->tracking() || m_trackText) {
+            puts(text);
+        } else {
+            ofp()->putsNoTracking(text);
+        }
+    }
+    virtual void visit(AstTextBlock* nodep) override {
+        visit(VN_CAST(nodep, NodeSimpleText));
+        for (AstNode* childp = nodep->nodesp(); childp; childp = childp->nextp()) {
+            iterate(childp);
+            if (nodep->commas() && childp->nextp()) puts(", ");
+        }
+    }
+    virtual void visit(AstCStmt* nodep) override {
+        putbs("");
+        iterateAndNextNull(nodep->bodysp());
+    }
+    virtual void visit(AstCMath* nodep) override {
+        putbs("");
+        iterateAndNextNull(nodep->bodysp());
+    }
+    virtual void visit(AstUCStmt* nodep) override {
+        VL_RESTORER(m_inUC);
+        m_inUC = true;
+        putsDecoration(ifNoProtect("// $c statement at " + nodep->fileline()->ascii() + "\n"));
+        iterateAndNextNull(nodep->bodysp());
+        puts("\n");
+    }
+    virtual void visit(AstUCFunc* nodep) override {
+        VL_RESTORER(m_inUC);
+        m_inUC = true;
+        puts("\n");
+        putsDecoration(ifNoProtect("// $c function at " + nodep->fileline()->ascii() + "\n"));
+        iterateAndNextNull(nodep->bodysp());
+        puts("\n");
+    }
+
+    // Operators
+    virtual void visit(AstNodeTermop* nodep) override {
+        emitOpName(nodep, nodep->emitC(), nullptr, nullptr, nullptr);
+    }
+    virtual void visit(AstNodeUniop* nodep) override {
+        if (nodep->emitCheckMaxWords()
+            && (nodep->widthWords() > VL_MULS_MAX_WORDS
+                || nodep->lhsp()->widthWords() > VL_MULS_MAX_WORDS)) {
+            nodep->v3warn(
+                E_UNSUPPORTED,
+                "Unsupported: "
+                    << nodep->prettyOperatorName() << " operator of " << nodep->width()
+                    << " bits exceeds hardcoded limit VL_MULS_MAX_WORDS in verilatedos.h");
+        }
+        if (emitSimpleOk(nodep)) {
+            putbs("(");
+            puts(nodep->emitSimpleOperator());
+            puts(" ");
+            iterateAndNextNull(nodep->lhsp());
+            puts(")");
+        } else {
+            emitOpName(nodep, nodep->emitC(), nodep->lhsp(), nullptr, nullptr);
+        }
+    }
+    virtual void visit(AstNodeBiop* nodep) override {
+        if (nodep->emitCheckMaxWords() && nodep->widthWords() > VL_MULS_MAX_WORDS) {
+            nodep->v3warn(
+                E_UNSUPPORTED,
+                "Unsupported: "
+                    << nodep->prettyOperatorName() << " operator of " << nodep->width()
+                    << " bits exceeds hardcoded limit VL_MULS_MAX_WORDS in verilatedos.h");
+        }
+        if (emitSimpleOk(nodep)) {
+            putbs("(");
+            iterateAndNextNull(nodep->lhsp());
+            puts(" ");
+            putbs(nodep->emitSimpleOperator());
+            puts(" ");
+            iterateAndNextNull(nodep->rhsp());
+            puts(")");
+        } else {
+            emitOpName(nodep, nodep->emitC(), nodep->lhsp(), nodep->rhsp(), nullptr);
+        }
+    }
+    virtual void visit(AstNodeTriop* nodep) override {
+        UASSERT_OBJ(!emitSimpleOk(nodep), nodep, "Triop cannot be described in a simple way");
+        emitOpName(nodep, nodep->emitC(), nodep->lhsp(), nodep->rhsp(), nodep->thsp());
+    }
+    virtual void visit(AstRedXor* nodep) override {
+        if (nodep->lhsp()->isWide()) {
+            visit(VN_CAST(nodep, NodeUniop));
+        } else {
+            putbs("VL_REDXOR_");
+            puts(cvtToStr(nodep->lhsp()->dtypep()->widthPow2()));
+            puts("(");
+            iterateAndNextNull(nodep->lhsp());
+            puts(")");
+        }
+    }
+    virtual void visit(AstCCast* nodep) override {
+        // Extending a value of the same word width is just a NOP.
+        if (nodep->size() <= VL_IDATASIZE) {
+            puts("(IData)(");
+        } else {
+            puts("(QData)(");
+        }
+        iterateAndNextNull(nodep->lhsp());
+        puts(")");
+    }
+    virtual void visit(AstNodeCond* nodep) override {
+        // Widths match up already, so we'll just use C++'s operator w/o any temps.
+        if (nodep->expr1p()->isWide()) {
+            emitOpName(nodep, nodep->emitC(), nodep->condp(), nodep->expr1p(), nodep->expr2p());
+        } else {
+            putbs("(");
+            iterateAndNextNull(nodep->condp());
+            putbs(" ? ");
+            iterateAndNextNull(nodep->expr1p());
+            putbs(" : ");
+            iterateAndNextNull(nodep->expr2p());
+            puts(")");
+        }
+    }
+    virtual void visit(AstMemberSel* nodep) override {
+        iterateAndNextNull(nodep->fromp());
+        putbs("->");
+        puts(nodep->varp()->nameProtect());
+    }
+    virtual void visit(AstNullCheck* nodep) override {
+        puts("VL_NULL_CHECK(");
+        iterateAndNextNull(nodep->lhsp());
+        puts(", ");
+        putsQuoted(protect(nodep->fileline()->filename()));
+        puts(", ");
+        puts(cvtToStr(nodep->fileline()->lineno()));
+        puts(")");
+    }
+    virtual void visit(AstCNew* nodep) override {
+        puts("std::make_shared<" + prefixNameProtect(nodep->dtypep()) + ">(");
+        puts("vlSymsp");  // TODO make this part of argsp, and eliminate when unnecessary
+        if (nodep->argsp()) puts(", ");
+        iterateAndNextNull(nodep->argsp());
+        puts(")");
+    }
+    virtual void visit(AstNewCopy* nodep) override {
+        puts("std::make_shared<" + prefixNameProtect(nodep->dtypep()) + ">(");
+        puts("*");  // i.e. make into a reference
+        iterateAndNextNull(nodep->rhsp());
+        puts(")");
+    }
+    virtual void visit(AstSel* nodep) override {
+        // Note ASSIGN checks for this on a LHS
+        emitOpName(nodep, nodep->emitC(), nodep->fromp(), nodep->lsbp(), nodep->thsp());
+    }
+    virtual void visit(AstReplicate* nodep) override {
+        if (nodep->lhsp()->widthMin() == 1 && !nodep->isWide()) {
+            UASSERT_OBJ((static_cast<int>(VN_CAST(nodep->rhsp(), Const)->toUInt())
+                         * nodep->lhsp()->widthMin())
+                            == nodep->widthMin(),
+                        nodep, "Replicate non-constant or width miscomputed");
+            puts("VL_REPLICATE_");
+            emitIQW(nodep);
+            puts("OI(");
+            puts(cvtToStr(nodep->widthMin()));
+            if (nodep->lhsp()) puts("," + cvtToStr(nodep->lhsp()->widthMin()));
+            if (nodep->rhsp()) puts("," + cvtToStr(nodep->rhsp()->widthMin()));
+            puts(",");
+            iterateAndNextNull(nodep->lhsp());
+            puts(", ");
+            iterateAndNextNull(nodep->rhsp());
+            puts(")");
+        } else {
+            emitOpName(nodep, nodep->emitC(), nodep->lhsp(), nodep->rhsp(), nullptr);
+        }
+    }
+    virtual void visit(AstStreamL* nodep) override {
+        // Attempt to use a "fast" stream function for slice size = power of 2
+        if (!nodep->isWide()) {
+            uint32_t isPow2 = VN_CAST(nodep->rhsp(), Const)->num().countOnes() == 1;
+            uint32_t sliceSize = VN_CAST(nodep->rhsp(), Const)->toUInt();
+            if (isPow2 && sliceSize <= (nodep->isQuad() ? sizeof(uint64_t) : sizeof(uint32_t))) {
+                puts("VL_STREAML_FAST_");
+                emitIQW(nodep);
+                emitIQW(nodep->lhsp());
+                puts("I(");
+                puts(cvtToStr(nodep->widthMin()));
+                puts("," + cvtToStr(nodep->lhsp()->widthMin()));
+                puts("," + cvtToStr(nodep->rhsp()->widthMin()));
+                puts(",");
+                iterateAndNextNull(nodep->lhsp());
+                puts(", ");
+                uint32_t rd_log2 = V3Number::log2b(VN_CAST(nodep->rhsp(), Const)->toUInt());
+                puts(cvtToStr(rd_log2) + ")");
+                return;
+            }
+        }
+        emitOpName(nodep, "VL_STREAML_%nq%lq%rq(%nw,%lw,%rw, %P, %li, %ri)", nodep->lhsp(),
+                   nodep->rhsp(), nullptr);
+    }
+    virtual void visit(AstCastDynamic* nodep) override {
+        putbs("VL_CAST_DYNAMIC(");
+        iterateAndNextNull(nodep->lhsp());
+        puts(", ");
+        iterateAndNextNull(nodep->rhsp());
+        puts(")");
+    }
+    virtual void visit(AstCountBits* nodep) override {
+        putbs("VL_COUNTBITS_");
+        emitIQW(nodep->lhsp());
+        puts("(");
+        puts(cvtToStr(nodep->lhsp()->widthMin()));
+        puts(", ");
+        if (nodep->lhsp()->isWide()) {
+            puts(cvtToStr(nodep->lhsp()->widthWords()));  // Note argument width, not node width
+                                                          // (which is always 32)
+            puts(", ");
+        }
+        iterateAndNextNull(nodep->lhsp());
+        puts(", ");
+        iterateAndNextNull(nodep->rhsp());
+        puts(", ");
+        iterateAndNextNull(nodep->thsp());
+        puts(", ");
+        iterateAndNextNull(nodep->fhsp());
+        puts(")");
+    }
+    virtual void visit(AstInitItem* nodep) override { iterateChildren(nodep); }
+    // Terminals
+    virtual void visit(AstVarRef* nodep) override {
+        const AstVar* const varp = nodep->varp();
+        if (isConstPoolMod(varp->user4p())) {
+            // Reference to constant pool variable
+            puts(topClassName() + "__ConstPool__");
+        } else if (varp->isStatic()) {
+            // Access static variable via the containing class
+            puts(prefixNameProtect(varp->user4p()) + "::");
+        } else if (VN_IS(varp->user4p(), Class) && varp->user4p() != m_modp) {
+            // Superclass member reference
+            puts(prefixNameProtect(varp->user4p()) + "::");
+        } else if (!nodep->selfPointer().empty()) {
+            emitDereference(nodep->selfPointerProtect(m_useSelfForThis));
+        }
+        puts(nodep->varp()->nameProtect());
+    }
+    virtual void visit(AstAddrOfCFunc* nodep) override {
+        // Note: Can be thought to handle more, but this is all that is needed right now
+        AstCFunc* const funcp = nodep->funcp();
+        UASSERT_OBJ(funcp->isLoose(), nodep, "Cannot take address of non-loose method");
+        puts("&");
+        puts(funcNameProtect(funcp));
+    }
+    virtual void visit(AstConst* nodep) override {
+        if (nodep->isWide()) {
+            UASSERT_OBJ(m_wideTempRefp, nodep, "Wide Constant w/ no temp");
+            emitConstant(nodep, m_wideTempRefp, "");
+            m_wideTempRefp = nullptr;  // We used it, barf if set it a second time
+        } else {
+            emitConstant(nodep, nullptr, "");
+        }
+    }
+
+    //
+    virtual void visit(AstMTaskBody* nodep) override {
+        VL_RESTORER(m_useSelfForThis);
+        m_useSelfForThis = true;
+        iterateChildrenConst(nodep);
+    }
+    virtual void visit(AstConsAssoc* nodep) override {
+        putbs(nodep->dtypep()->cType("", false, false));
+        puts("()");
+        if (nodep->defaultp()) {
+            putbs(".setDefault(");
+            iterateAndNextNull(nodep->defaultp());
+            puts(")");
+        }
+    }
+    virtual void visit(AstSetAssoc* nodep) override {
+        iterateAndNextNull(nodep->lhsp());
+        putbs(".set(");
+        iterateAndNextNull(nodep->keyp());
+        puts(", ");
+        putbs("");
+        iterateAndNextNull(nodep->valuep());
+        puts(")");
+    }
+    virtual void visit(AstConsDynArray* nodep) override {
+        putbs(nodep->dtypep()->cType("", false, false));
+        if (!nodep->lhsp()) {
+            puts("()");
+        } else {
+            puts("::cons(");
+            iterateAndNextNull(nodep->lhsp());
+            if (nodep->rhsp()) {
+                puts(", ");
+                putbs("");
+            }
+            iterateAndNextNull(nodep->rhsp());
+            puts(")");
+        }
+    }
+    virtual void visit(AstConsQueue* nodep) override {
+        putbs(nodep->dtypep()->cType("", false, false));
+        if (!nodep->lhsp()) {
+            puts("()");
+        } else {
+            puts("::cons(");
+            iterateAndNextNull(nodep->lhsp());
+            if (nodep->rhsp()) {
+                puts(", ");
+                putbs("");
+            }
+            iterateAndNextNull(nodep->rhsp());
+            puts(")");
+        }
+    }
+    virtual void visit(AstCReset* nodep) override {
+        AstVar* varp = nodep->varrefp()->varp();
+        emitVarReset(varp);
+    }
+    virtual void visit(AstExecGraph* nodep) override {
+        UASSERT_OBJ(nodep == v3Global.rootp()->execGraphp(), nodep,
+                    "ExecGraph should be a singleton!");
+        // The location of the AstExecGraph within the containing _eval()
+        // function is where we want to invoke the graph and wait for it to
+        // complete. Emitting the children does just that.
+        iterateChildrenConst(nodep);
+    }
+    virtual void visit(AstChangeDet* nodep) override {  //
+        m_blkChangeDetVec.push_back(nodep);
+    }
+
+    // Just iterate
+    virtual void visit(AstNetlist* nodep) override { iterateChildren(nodep); }
+    virtual void visit(AstTopScope* nodep) override { iterateChildren(nodep); }
+    virtual void visit(AstScope* nodep) override { iterateChildren(nodep); }
+    // NOPs
+    virtual void visit(AstTypedef*) override {}
+    virtual void visit(AstPragma*) override {}
+    virtual void visit(AstCell*) override {}  // Handled outside the Visit class
+    virtual void visit(AstVar*) override {}  // Handled outside the Visit class
+    virtual void visit(AstNodeText*) override {}  // Handled outside the Visit class
+    virtual void visit(AstTraceDecl*) override {}  // Handled outside the Visit class
+    virtual void visit(AstTraceInc*) override {}  // Handled outside the Visit class
+    virtual void visit(AstCFile*) override {}  // Handled outside the Visit class
+    virtual void visit(AstCellInline*) override {}  // Handled outside visit (in EmitCSyms)
+    virtual void visit(AstCUse*) override {}  // Handled outside the Visit class
+    // Default
+    virtual void visit(AstNode* nodep) override {
+        puts(string("\n???? // ") + nodep->prettyTypeName() + "\n");
+        iterateChildren(nodep);
+        if (!v3Global.opt.lintOnly()) {  // An internal problem, so suppress
+            nodep->v3fatalSrc("Unknown node type reached emitter: " << nodep->prettyTypeName());
+        }
+    }
+
+    EmitCFunc()
+        : m_lazyDecls(*this) {
+        m_suppressSemi = false;
+        m_wideTempRefp = nullptr;
+        m_labelNum = 0;
+        m_splitSize = 0;
+        m_splitFilenum = 0;
+    }
+    EmitCFunc(AstNode* nodep, V3OutCFile* ofp, bool trackText = false)
+        : EmitCFunc{} {
+        m_ofp = ofp;
+        m_trackText = trackText;
+        iterate(nodep);
+    }
+    virtual ~EmitCFunc() override = default;
+};
+
+#endif  // guard

From 2825940fad9cc21d078e96d0b5dff43b68c714d9 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Fri, 25 Jun 2021 18:00:58 +0100
Subject: [PATCH 53/73] Fix dtype when simplifying masked shift.

Fixes #3044
---
 src/V3Const.cpp                       |  9 ++++----
 test_regress/t/t_write_format_bug.out |  9 ++++++++
 test_regress/t/t_write_format_bug.pl  | 22 ++++++++++++++++++++
 test_regress/t/t_write_format_bug.v   | 30 +++++++++++++++++++++++++++
 4 files changed, 66 insertions(+), 4 deletions(-)
 create mode 100644 test_regress/t/t_write_format_bug.out
 create mode 100755 test_regress/t/t_write_format_bug.pl
 create mode 100644 test_regress/t/t_write_format_bug.v

diff --git a/src/V3Const.cpp b/src/V3Const.cpp
index 0a1fcdb91..49dc1a377 100644
--- a/src/V3Const.cpp
+++ b/src/V3Const.cpp
@@ -812,12 +812,13 @@ private:
         // commonly appears after V3Expand and the simplification in matchMaskedOr. Similarly,
         // drop redundant masking of left shift result. E.g.: 0xff000000 & ((uint32_t)a << 24).
 
-        if (nodep->width() != nodep->rhsp()->width()) return false;  // Paranoia
-
         const auto checkMask = [=](const V3Number& mask) -> bool {
             const AstConst* const constp = VN_CAST(nodep->lhsp(), Const);
             if (constp->num().isCaseEq(mask)) {
-                nodep->replaceWith(nodep->rhsp()->unlinkFrBack());
+                AstNode* const rhsp = nodep->rhsp();
+                rhsp->unlinkFrBack();
+                nodep->replaceWith(rhsp);
+                rhsp->dtypeFrom(nodep);
                 VL_DO_DANGLING(nodep->deleteTree(), nodep);
                 return true;
             }
@@ -3101,7 +3102,7 @@ private:
     // Common two-level operations that can be simplified
     TREEOP ("AstAnd {$lhsp.castConst,matchAndCond(nodep)}", "DONE");
     TREEOP ("AstAnd {$lhsp.castConst, $rhsp.castOr, matchMaskedOr(nodep)}", "DONE");
-    TREEOP ("AstAnd {$lhsp.castConst, matchMaskedShift(nodep)}", "DONE");
+    TREEOPC("AstAnd {$lhsp.castConst, matchMaskedShift(nodep)}", "DONE");
     TREEOP ("AstAnd {$lhsp.castOr, $rhsp.castOr, operandAndOrSame(nodep)}", "replaceAndOr(nodep)");
     TREEOP ("AstOr  {$lhsp.castAnd,$rhsp.castAnd,operandAndOrSame(nodep)}", "replaceAndOr(nodep)");
     TREEOP ("AstOr  {matchOrAndNot(nodep)}",            "DONE");
diff --git a/test_regress/t/t_write_format_bug.out b/test_regress/t/t_write_format_bug.out
new file mode 100644
index 000000000..ab787ff12
--- /dev/null
+++ b/test_regress/t/t_write_format_bug.out
@@ -0,0 +1,9 @@
+00005678
+00001234
+00005679
+00001234
+0000567a
+00001234
+0000567b
+00001234
+*-* All Finished *-*
diff --git a/test_regress/t/t_write_format_bug.pl b/test_regress/t/t_write_format_bug.pl
new file mode 100755
index 000000000..1576259ea
--- /dev/null
+++ b/test_regress/t/t_write_format_bug.pl
@@ -0,0 +1,22 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+compile(
+    );
+
+execute(
+    check_finished => 1,
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_write_format_bug.v b/test_regress/t/t_write_format_bug.v
new file mode 100644
index 000000000..11a6895f1
--- /dev/null
+++ b/test_regress/t/t_write_format_bug.v
@@ -0,0 +1,30 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2021 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module test(
+            /*AUTOARG*/
+   // Inputs
+   clk
+   );
+
+   input clk;
+
+   int   cnt = 32'h12345678;
+   int   cyc = 0;
+
+   always @(posedge clk) begin
+      if (cyc > 3) begin
+         $write("*-* All Finished *-*\n");
+         $finish;
+      end else begin
+         cyc <= cyc + 1;
+         cnt <= cnt + 1;
+         $write("%08x\n", {16'h0, cnt[15: 0]});
+         $write("%08x\n", {16'h0, cnt[31:16]});
+      end
+   end
+
+endmodule

From e7b6a7ef6a4e6644f2672aafd8ff358505e89336 Mon Sep 17 00:00:00 2001
From: Morten Borup Petersen <morten_bp@live.dk>
Date: Mon, 28 Jun 2021 20:06:21 +0200
Subject: [PATCH 54/73] Fix shadowing of vlSymsp member with argument (#3046).

This commit removes shadowing of the vlSymsp member of the emitted
modules, allowing models to compile when -Werror=shadow is set. This may
be useful when i.e., an external project which defines its own error
flags depends on the verilated model.
---
 src/V3EmitC.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 4e2bacc49..386985aa5 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -339,9 +339,9 @@ void EmitCImp::emitConfigureImp(AstNodeModule* modp) {
     }
 
     puts("\nvoid " + modName + "::" + protect("__Vconfigure") + "(" + symClassName()
-         + "* vlSymsp, bool first) {\n");
+         + "* _vlSymsp, bool first) {\n");
     puts("if (false && first) {}  // Prevent unused\n");
-    puts("this->vlSymsp = vlSymsp;\n");  // First, as later stuff needs it.
+    puts("this->vlSymsp = _vlSymsp;\n");  // First, as later stuff needs it.
     if (v3Global.opt.coverage()) {
         puts(modName + "__" + protect("_configure_coverage") + "(this, first);\n");
     }

From ee4a601c9e50d5af6406144ac3d567e568fee5f0 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Mon, 28 Jun 2021 22:40:39 -0400
Subject: [PATCH 55/73] Internals: Use interface initialization for cleaner
 code. No functional change.

---
 src/V3EmitC.cpp | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 386985aa5..1532fb7c7 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -319,12 +319,6 @@ void EmitCImp::emitCtorImp(AstNodeModule* modp) {
              // duration of the eval call.
              + string("vlSymsp->_vm_contextp__, ") + cvtToStr(v3Global.opt.threads() - 1) + ", "
              + cvtToStr(v3Global.opt.profThreads()) + ");\n");
-
-        if (v3Global.opt.profThreads()) {
-            puts("__Vm_profile_cycle_start = 0;\n");
-            puts("__Vm_profile_time_finished = 0;\n");
-            puts("__Vm_profile_window_ct = 0;");
-        }
     }
     puts("}\n");
 }
@@ -713,11 +707,11 @@ void EmitCImp::emitThreadingState() {
 
     if (v3Global.opt.profThreads()) {
         // rdtsc() at current cycle start
-        puts("vluint64_t __Vm_profile_cycle_start;\n");
+        puts("vluint64_t __Vm_profile_cycle_start = 0;\n");
         // Time we finished analysis
-        puts("vluint64_t __Vm_profile_time_finished;\n");
+        puts("vluint64_t __Vm_profile_time_finished = 0;\n");
         // Track our position in the cache warmup and actual profile window
-        puts("vluint32_t __Vm_profile_window_ct;\n");
+        puts("vluint32_t __Vm_profile_window_ct = 0;\n");
     }
 }
 

From 2cdf0aae727333148c30425bbb2d9224cfd70fac Mon Sep 17 00:00:00 2001
From: Felix Yan <felixonmars@archlinux.org>
Date: Tue, 29 Jun 2021 11:18:14 +0800
Subject: [PATCH 56/73] Commentary: Correct a typo in configure.ac (#3045)

---
 configure.ac      | 2 +-
 docs/CONTRIBUTORS | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index d20a7c567..aa5be2ee7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -35,7 +35,7 @@ AC_ARG_ENABLE([silent-rules],
 AC_MSG_CHECKING(whether to perform partial static linking of Verilator binary)
 AC_ARG_ENABLE([partial-static],
               [AS_HELP_STRING([--disable-partial-static],
-                              [By default, for Verilation peformance, Verilator
+                              [By default, for Verilation performance, Verilator
                                is linked against some of its dependencies
                                statically. Use this to link the Verilator binary
                                fully dynamically.])],
diff --git a/docs/CONTRIBUTORS b/docs/CONTRIBUTORS
index 1da70dd75..47c79e2f9 100644
--- a/docs/CONTRIBUTORS
+++ b/docs/CONTRIBUTORS
@@ -20,6 +20,7 @@ Driss Hafdi
 Edgar E. Iglesias
 Eric Rippey
 Fan Shupei
+Felix Yan
 Garrett Smith
 Geza Lore
 Gianfranco Costamagna

From 22e0f3edbea47bd88dca78a85fd5180b104f7f35 Mon Sep 17 00:00:00 2001
From: Yutetsu TAKATSUKASA <y.takatsukasa@gmail.com>
Date: Wed, 30 Jun 2021 21:20:56 +0900
Subject: [PATCH 57/73] Introduce small object optimization to V3Number (#3034)

---
 src/V3Number.cpp | 173 ++++++++++++++++++++++++-----------------------
 src/V3Number.h   | 116 +++++++++++++++++++++----------
 2 files changed, 169 insertions(+), 120 deletions(-)

diff --git a/src/V3Number.cpp b/src/V3Number.cpp
index 13e60f862..fe0197718 100644
--- a/src/V3Number.cpp
+++ b/src/V3Number.cpp
@@ -101,10 +101,9 @@ V3Number::V3Number(VerilogStringLiteral, AstNode* nodep, const string& str) {
     m_fromString = true;
     for (unsigned pos = 0; pos < str.length(); ++pos) {
         const int topos = str.length() - 1 - pos;
+        ValueAndX& v = m_value[topos / 4];
         for (int bit = 0; bit < 8; ++bit) {
-            if (str[pos] & (1UL << bit)) {
-                m_value[topos / 4] |= (1UL << (bit + (topos % 4) * 8));
-            }
+            if (str[pos] & (1UL << bit)) { v.m_value |= (1UL << (bit + (topos % 4) * 8)); }
         }
     }
     opCleanThis(true);
@@ -159,7 +158,7 @@ void V3Number::V3NumberCreate(AstNode* nodep, const char* sourcep, FileLine* fl)
         base = 'd';
     }
 
-    for (int i = 0; i < words(); ++i) m_value[i] = m_valueX[i] = 0;
+    for (int i = 0; i < words(); ++i) m_value[i] = {0, 0};
 
     // Special SystemVerilog unsized constructs
     if (base == '0') {
@@ -216,7 +215,7 @@ void V3Number::V3NumberCreate(AstNode* nodep, const char* sourcep, FileLine* fl)
                 if (olen <= 7) {  // 10000000 fits in 32 bits, so ok
                     // Constants are common, so for speed avoid wide math until we need it
                     val = val * 10 + (*cp - '0');
-                    m_value[0] = val;
+                    m_value[0].m_value = val;
                 } else {  // Wide; all previous digits are already in m_value[0]
                     // this = (this * 10)/*product*/ + (*cp-'0')/*addend*/
                     // Assumed rare; lots of optimizations are possible here
@@ -373,31 +372,31 @@ int V3Number::log2b(uint32_t num) {
 // Setters
 
 V3Number& V3Number::setZero() {
-    for (int i = 0; i < words(); i++) m_value[i] = m_valueX[i] = 0;
+    for (int i = 0; i < words(); i++) m_value[i] = {0, 0};
     return *this;
 }
 V3Number& V3Number::setQuad(vluint64_t value) {
-    for (int i = 0; i < words(); i++) m_value[i] = m_valueX[i] = 0;
-    m_value[0] = value & 0xffffffffULL;
-    m_value[1] = (value >> 32ULL) & 0xffffffffULL;
+    for (int i = 0; i < words(); i++) m_value[i] = {0, 0};
+    m_value[0].m_value = value & 0xffffffffULL;
+    if (width() > 32) m_value[1].m_value = (value >> 32ULL) & 0xffffffffULL;
     opCleanThis();
     return *this;
 }
 V3Number& V3Number::setLong(uint32_t value) {
-    for (int i = 0; i < words(); i++) m_value[i] = m_valueX[i] = 0;
-    m_value[0] = value;
+    for (int i = 0; i < words(); i++) m_value[i] = {0, 0};
+    m_value[0].m_value = value;
     opCleanThis();
     return *this;
 }
 V3Number& V3Number::setLongS(vlsint32_t value) {
-    for (int i = 0; i < words(); i++) m_value[i] = m_valueX[i] = 0;
+    for (int i = 0; i < words(); i++) m_value[i] = {0, 0};
     union {
         uint32_t u;
         vlsint32_t s;
     } u;
     u.s = value;
     if (u.s) {}
-    m_value[0] = u.u;
+    m_value[0].m_value = u.u;
     opCleanThis();
     return *this;
 }
@@ -410,41 +409,35 @@ V3Number& V3Number::setDouble(double value) {
     } u;
     u.d = value;
     if (u.d != 0.0) {}
-    for (int i = 2; i < words(); i++) m_value[i] = m_valueX[i] = 0;
-    m_value[0] = u.u[0];
-    m_value[1] = u.u[1];
+    for (int i = 2; i < words(); i++) m_value[i] = {0, 0};
+    m_value[0].m_value = u.u[0];
+    m_value[1].m_value = u.u[1];
     return *this;
 }
 V3Number& V3Number::setSingleBits(char value) {
-    for (int i = 1 /*upper*/; i < words(); i++) m_value[i] = m_valueX[i] = 0;
-    m_value[0] = (value == '1' || value == 'x' || value == 1 || value == 3);
-    m_valueX[0] = (value == 'z' || value == 'x' || value == 2 || value == 3);
+    for (int i = 1 /*upper*/; i < words(); i++) m_value[i] = {0, 0};
+    m_value[0] = {(value == '1' || value == 'x' || value == 1 || value == 3),
+                  (value == 'z' || value == 'x' || value == 2 || value == 3)};
     return *this;
 }
 
 V3Number& V3Number::setAllBits0() {
-    for (int i = 0; i < words(); i++) { m_value[i] = m_valueX[i] = 0; }
+    for (int i = 0; i < words(); i++) { m_value[i] = {0, 0}; }
     return *this;
 }
 V3Number& V3Number::setAllBits1() {
-    for (int i = 0; i < words(); i++) {
-        m_value[i] = ~0;
-        m_valueX[i] = 0;
-    }
+    for (int i = 0; i < words(); i++) { m_value[i] = {~0u, 0}; }
     opCleanThis();
     return *this;
 }
 V3Number& V3Number::setAllBitsX() {
     // Use setAllBitsXRemoved if calling this based on a non-X/Z input value such as divide by zero
-    for (int i = 0; i < words(); i++) { m_value[i] = m_valueX[i] = ~0; }
+    for (int i = 0; i < words(); i++) { m_value[i] = {~0u, ~0u}; }
     opCleanThis();
     return *this;
 }
 V3Number& V3Number::setAllBitsZ() {
-    for (int i = 0; i < words(); i++) {
-        m_value[i] = 0;
-        m_valueX[i] = ~0;
-    }
+    for (int i = 0; i < words(); i++) { m_value[i] = {0, ~0u}; }
     opCleanThis();
     return *this;
 }
@@ -485,7 +478,8 @@ string V3Number::ascii(bool prefixed, bool cleanVerilog) const {
     } else if (isString()) {
         return '"' + toString() + '"';
     } else {
-        if (VL_UNCOVERABLE((m_value[words() - 1] | m_valueX[words() - 1]) & ~hiWordMask())) {
+        if (VL_UNCOVERABLE((m_value[words() - 1].m_value | m_value[words() - 1].m_valueX)
+                           & ~hiWordMask())) {
             out << "%E-hidden-bits";  // LCOV_EXCL_LINE
         }
     }
@@ -704,23 +698,25 @@ string V3Number::displayed(FileLine* fl, const string& vformat) const {
     // 'p'   // Packed - converted to another code by V3Width
     case 'u': {  // Packed 2-state
         for (int i = 0; i < words(); i++) {
-            str += static_cast<char>((m_value[i] >> 0) & 0xff);
-            str += static_cast<char>((m_value[i] >> 8) & 0xff);
-            str += static_cast<char>((m_value[i] >> 16) & 0xff);
-            str += static_cast<char>((m_value[i] >> 24) & 0xff);
+            const uint32_t v = m_value[i].m_value;
+            str += static_cast<char>((v >> 0) & 0xff);
+            str += static_cast<char>((v >> 8) & 0xff);
+            str += static_cast<char>((v >> 16) & 0xff);
+            str += static_cast<char>((v >> 24) & 0xff);
         }
         return str;
     }
     case 'z': {  // Packed 4-state
         for (int i = 0; i < words(); i++) {
-            str += static_cast<char>((m_value[i] >> 0) & 0xff);
-            str += static_cast<char>((m_value[i] >> 8) & 0xff);
-            str += static_cast<char>((m_value[i] >> 16) & 0xff);
-            str += static_cast<char>((m_value[i] >> 24) & 0xff);
-            str += static_cast<char>((m_valueX[i] >> 0) & 0xff);
-            str += static_cast<char>((m_valueX[i] >> 8) & 0xff);
-            str += static_cast<char>((m_valueX[i] >> 16) & 0xff);
-            str += static_cast<char>((m_valueX[i] >> 24) & 0xff);
+            const ValueAndX v = m_value[i];
+            str += static_cast<char>((v.m_value >> 0) & 0xff);
+            str += static_cast<char>((v.m_value >> 8) & 0xff);
+            str += static_cast<char>((v.m_value >> 16) & 0xff);
+            str += static_cast<char>((v.m_value >> 24) & 0xff);
+            str += static_cast<char>((v.m_valueX >> 0) & 0xff);
+            str += static_cast<char>((v.m_valueX >> 8) & 0xff);
+            str += static_cast<char>((v.m_valueX >> 16) & 0xff);
+            str += static_cast<char>((v.m_valueX >> 24) & 0xff);
         }
         return str;
     }
@@ -809,12 +805,12 @@ uint32_t V3Number::toUInt() const {
     UASSERT(!isFourState(), "toUInt with 4-state " << *this);
     // We allow wide numbers that represent values <= 32 bits
     for (int i = 1; i < words(); ++i) {
-        if (m_value[i]) {
+        if (m_value[i].m_value) {
             v3error("Value too wide for 32-bits expected in this context " << *this);
             break;
         }
     }
-    return m_value[0];
+    return m_value[0].m_value;
 }
 
 double V3Number::toDouble() const {
@@ -825,8 +821,8 @@ double V3Number::toDouble() const {
         double d;
         uint32_t u[2];
     } u;
-    u.u[0] = m_value[0];
-    u.u[1] = m_value[1];
+    u.u[0] = m_value[0].m_value;
+    u.u[1] = m_value[1].m_value;
     return u.d;
 }
 
@@ -848,14 +844,14 @@ vluint64_t V3Number::toUQuad() const {
     // We allow wide numbers that represent values <= 64 bits
     if (isDouble()) return static_cast<vluint64_t>(toDouble());
     for (int i = 2; i < words(); ++i) {
-        if (m_value[i]) {
+        if (m_value[i].m_value) {
             v3error("Value too wide for 64-bits expected in this context " << *this);
             break;
         }
     }
     if (width() <= 32) return (static_cast<vluint64_t>(toUInt()));
-    return ((static_cast<vluint64_t>(m_value[1]) << 32ULL)
-            | (static_cast<vluint64_t>(m_value[0])));
+    return ((static_cast<vluint64_t>(m_value[1].m_value) << 32ULL)
+            | (static_cast<vluint64_t>(m_value[0].m_value)));
 }
 
 vlsint64_t V3Number::toSQuad() const {
@@ -886,13 +882,13 @@ string V3Number::toString() const {
 
 V3Hash V3Number::toHash() const {
     V3Hash hash(m_width);
-    for (int i = 0; i < words(); ++i) { hash += m_value[i]; }
+    for (int i = 0; i < words(); ++i) { hash += m_value[i].m_value; }
     return hash;
 }
 
 uint32_t V3Number::edataWord(int eword) const {
     UASSERT(!isFourState(), "edataWord with 4-state " << *this);
-    return m_value[eword];
+    return m_value[eword].m_value;
 }
 
 uint8_t V3Number::dataByte(int byte) const {
@@ -901,13 +897,15 @@ uint8_t V3Number::dataByte(int byte) const {
 
 bool V3Number::isEqZero() const {
     for (int i = 0; i < words(); i++) {
-        if (m_value[i] || m_valueX[i]) return false;
+        const ValueAndX v = m_value[i];
+        if (v.m_value || v.m_valueX) return false;
     }
     return true;
 }
 bool V3Number::isNeqZero() const {
     for (int i = 0; i < words(); i++) {
-        if (m_value[i] & ~m_valueX[i]) return true;
+        const ValueAndX v = m_value[i];
+        if (v.m_value & ~v.m_valueX) return true;
     }
     return false;
 }
@@ -918,9 +916,10 @@ bool V3Number::isBitsZero(int msb, int lsb) const {
     return true;
 }
 bool V3Number::isEqOne() const {
-    if (m_value[0] != 1 || m_valueX[0]) return false;
+    if (m_value[0].m_value != 1 || m_value[0].m_valueX) return false;
     for (int i = 1; i < words(); i++) {
-        if (m_value[i] || m_valueX[i]) return false;
+        const ValueAndX v = m_value[i];
+        if (v.m_value || v.m_valueX) return false;
     }
     return true;
 }
@@ -934,7 +933,7 @@ bool V3Number::isEqAllOnes(int optwidth) const {
 bool V3Number::isFourState() const {
     if (isDouble() || isString()) return false;
     for (int i = 0; i < words(); ++i) {
-        if (m_valueX[i]) return true;
+        if (m_value[i].m_valueX) return true;
     }
     return false;
 }
@@ -1129,7 +1128,7 @@ V3Number& V3Number::opCountBits(const V3Number& expr, const V3Number& ctrl1, con
     NUM_ASSERT_OP_ARGS4(expr, ctrl1, ctrl2, ctrl3);
     NUM_ASSERT_LOGIC_ARGS4(expr, ctrl1, ctrl2, ctrl3);
     setZero();
-    m_value[0] = expr.countBits(ctrl1, ctrl2, ctrl3);
+    m_value[0].m_value = expr.countBits(ctrl1, ctrl2, ctrl3);
     opCleanThis();
     return *this;
 }
@@ -1138,7 +1137,7 @@ V3Number& V3Number::opCountOnes(const V3Number& lhs) {
     NUM_ASSERT_LOGIC_ARGS1(lhs);
     if (lhs.isFourState()) return setAllBitsX();
     setZero();
-    m_value[0] = lhs.countOnes();
+    m_value[0].m_value = lhs.countOnes();
     opCleanThis();
     return *this;
 }
@@ -1531,8 +1530,10 @@ bool V3Number::isCaseEq(const V3Number& rhs) const {
     if (isString()) return toString() == rhs.toString();
     if (isDouble()) return toDouble() == rhs.toDouble();
     if (this->width() != rhs.width()) return false;
-    if (m_value != rhs.m_value) return false;
-    return m_valueX == rhs.m_valueX;
+    for (int i = 0; i < words(); ++i) {
+        if (!(m_value[i] == rhs.m_value[i])) return false;
+    }
+    return true;
 }
 
 V3Number& V3Number::opCaseEq(const V3Number& lhs, const V3Number& rhs) {
@@ -1761,15 +1762,15 @@ V3Number& V3Number::opMul(const V3Number& lhs, const V3Number& rhs) {
         opCleanThis();  // Mult produces extra bits in result
     } else {
         for (int lword = 0; lword < lhs.words(); lword++) {
-            const vluint64_t lwordval = static_cast<vluint64_t>(lhs.m_value[lword]);
+            const vluint64_t lwordval = static_cast<vluint64_t>(lhs.m_value[lword].m_value);
             if (lwordval == 0) continue;
             for (int rword = 0; rword < rhs.words(); rword++) {
-                const vluint64_t rwordval = static_cast<vluint64_t>(rhs.m_value[rword]);
+                const vluint64_t rwordval = static_cast<vluint64_t>(rhs.m_value[rword].m_value);
                 if (rwordval == 0) continue;
                 vluint64_t mul = lwordval * rwordval;
                 for (int qword = lword + rword; qword < this->words(); qword++) {
-                    mul += static_cast<vluint64_t>(m_value[qword]);
-                    m_value[qword] = (mul & 0xffffffffULL);
+                    mul += static_cast<vluint64_t>(m_value[qword].m_value);
+                    m_value[qword].m_value = (mul & 0xffffffffULL);
                     mul = (mul >> 32ULL) & 0xffffffffULL;
                     if (mul == 0) break;
                 }
@@ -1886,16 +1887,17 @@ V3Number& V3Number::opModDivGuts(const V3Number& lhs, const V3Number& rhs, bool
     if (vw == 1) {  // Single divisor word breaks rest of algorithm
         vluint64_t k = 0;
         for (int j = uw - 1; j >= 0; j--) {
-            vluint64_t unw64 = ((k << 32ULL) + static_cast<vluint64_t>(lhs.m_value[j]));
-            m_value[j] = unw64 / static_cast<vluint64_t>(rhs.m_value[0]);
+            vluint64_t unw64 = ((k << 32ULL) + static_cast<vluint64_t>(lhs.m_value[j].m_value));
+            m_value[j].m_value = unw64 / static_cast<vluint64_t>(rhs.m_value[0].m_value);
             k = unw64
-                - (static_cast<vluint64_t>(m_value[j]) * static_cast<vluint64_t>(rhs.m_value[0]));
+                - (static_cast<vluint64_t>(m_value[j].m_value)
+                   * static_cast<vluint64_t>(rhs.m_value[0].m_value));
         }
         UINFO(9, "  opmoddiv-1w  " << lhs << " " << rhs << " q=" << *this << " rem=0x" << std::hex
                                    << k << std::dec << endl);
         if (is_modulus) {
             setZero();
-            m_value[0] = k;
+            m_value[0].m_value = k;
         }
         opCleanThis();
         return *this;
@@ -1906,7 +1908,7 @@ V3Number& V3Number::opModDivGuts(const V3Number& lhs, const V3Number& rhs, bool
     uint32_t vn[VL_MULS_MAX_WORDS + 1];  // v normalized
 
     // Zero for ease of debugging and to save having to zero for shifts
-    for (int i = 0; i < words; i++) { m_value[i] = 0; }
+    for (int i = 0; i < words; i++) { m_value[i].m_value = 0; }
     for (int i = 0; i < words + 1; i++) { un[i] = vn[i] = 0; }  // +1 as vn may get extra word
 
     // Algorithm requires divisor MSB to be set
@@ -1914,20 +1916,22 @@ V3Number& V3Number::opModDivGuts(const V3Number& lhs, const V3Number& rhs, bool
     int s = 31 - ((vmsbp1 - 1) & 31);  // shift amount (0...31)
     uint32_t shift_mask = s ? 0xffffffff : 0;  // otherwise >> 32 won't mask the value
     for (int i = vw - 1; i > 0; i--) {
-        vn[i] = (rhs.m_value[i] << s) | (shift_mask & (rhs.m_value[i - 1] >> (32 - s)));
+        vn[i] = (rhs.m_value[i].m_value << s)
+                | (shift_mask & (rhs.m_value[i - 1].m_value >> (32 - s)));
     }
-    vn[0] = rhs.m_value[0] << s;
+    vn[0] = rhs.m_value[0].m_value << s;
 
     // Copy and shift dividend by same amount; may set new upper word
     if (s) {
-        un[uw] = lhs.m_value[uw - 1] >> (32 - s);
+        un[uw] = lhs.m_value[uw - 1].m_value >> (32 - s);
     } else {
         un[uw] = 0;
     }
     for (int i = uw - 1; i > 0; i--) {
-        un[i] = (lhs.m_value[i] << s) | (shift_mask & (lhs.m_value[i - 1] >> (32 - s)));
+        un[i] = (lhs.m_value[i].m_value << s)
+                | (shift_mask & (lhs.m_value[i - 1].m_value >> (32 - s)));
     }
-    un[0] = lhs.m_value[0] << s;
+    un[0] = lhs.m_value[0].m_value << s;
 
     // printf("  un="); for (int i=5; i>=0; i--) printf(" %08x",un[i]); printf("\n");
     // printf("  vn="); for (int i=5; i>=0; i--) printf(" %08x",vn[i]); printf("\n");
@@ -1958,11 +1962,11 @@ V3Number& V3Number::opModDivGuts(const V3Number& lhs, const V3Number& rhs, bool
         }
         t = un[j + vw] - k;
         un[j + vw] = t;
-        this->m_value[j] = qhat;  // Save quotient digit
+        this->m_value[j].m_value = qhat;  // Save quotient digit
 
         if (t < 0) {
             // Over subtracted; correct by adding back
-            this->m_value[j]--;
+            this->m_value[j].m_value--;
             k = 0;
             for (int i = 0; i < vw; i++) {
                 t = static_cast<vluint64_t>(un[i + j]) + static_cast<vluint64_t>(vn[i]) + k;
@@ -1980,9 +1984,9 @@ V3Number& V3Number::opModDivGuts(const V3Number& lhs, const V3Number& rhs, bool
     if (is_modulus) {  // modulus
         // Need to reverse normalization on copy to output
         for (int i = 0; i < vw; i++) {
-            m_value[i] = (un[i] >> s) | (shift_mask & (un[i + 1] << (32 - s)));
+            m_value[i].m_value = (un[i] >> s) | (shift_mask & (un[i + 1] << (32 - s)));
         }
-        for (int i = vw; i < words; i++) m_value[i] = 0;
+        for (int i = vw; i < words; i++) m_value[i].m_value = 0;
         opCleanThis();
         UINFO(9, "  opmoddiv-mod " << lhs << " " << rhs << " now=" << *this << endl);
         return *this;
@@ -2016,7 +2020,7 @@ V3Number& V3Number::opPow(const V3Number& lhs, const V3Number& rhs, bool lsign,
     }
     if (lhs.isEqZero()) return setZero();
     setZero();
-    m_value[0] = 1;
+    m_value[0].m_value = 1;
     V3Number power(&lhs, width());
     power.opAssign(lhs);
     for (int bit = 0; bit < rhs.width(); bit++) {
@@ -2104,15 +2108,14 @@ V3Number& V3Number::opClean(const V3Number& lhs, uint32_t bits) { return opSel(l
 void V3Number::opCleanThis(bool warnOnTruncation) {
     // Clean MSB of number
     NUM_ASSERT_LOGIC_ARGS1(*this);
-    uint32_t newValueMsb = m_value[words() - 1] & hiWordMask();
-    uint32_t newValueXMsb = m_valueX[words() - 1] & hiWordMask();
-    if (warnOnTruncation
-        && (newValueMsb != m_value[words() - 1] || newValueXMsb != m_valueX[words() - 1])) {
+    const ValueAndX v = m_value[words() - 1];
+    uint32_t newValueMsb = v.m_value & hiWordMask();
+    uint32_t newValueXMsb = v.m_valueX & hiWordMask();
+    if (warnOnTruncation && (newValueMsb != v.m_value || newValueXMsb != v.m_valueX)) {
         // Displaying in decimal avoids hiWordMask truncation
         v3warn(WIDTH, "Value too large for " << width() << " bit number: " << displayed("%d"));
     }
-    m_value[words() - 1] = newValueMsb;
-    m_valueX[words() - 1] = newValueXMsb;
+    m_value[words() - 1] = {newValueMsb, newValueXMsb};
 }
 
 V3Number& V3Number::opSel(const V3Number& lhs, const V3Number& msb, const V3Number& lsb) {
diff --git a/src/V3Number.h b/src/V3Number.h
index fd0f41f93..961b9c414 100644
--- a/src/V3Number.h
+++ b/src/V3Number.h
@@ -38,8 +38,52 @@ inline bool v3EpsilonEqual(double a, double b) {
 //============================================================================
 
 class AstNode;
+class FileLine;
+
+// Holds a few entries of ValueAndX to avoid dynamic allocation in std::vector for less width of
+// constants
+class V3NumberData final {
+public:
+    // TYPES
+    struct ValueAndX final {
+        // Value, with bit 0 in bit 0 of this vector (unless X/Z)
+        uint32_t m_value;
+        // Each bit is true if it's X or Z, 10=z, 11=x
+        uint32_t m_valueX;
+        bool operator==(const ValueAndX& other) const {
+            return m_value == other.m_value && m_valueX == other.m_valueX;
+        }
+    };
+
+private:
+    // MEMBERS
+    static constexpr size_t m_inlinedSize = 2;  // Can hold 64 bit without dynamic allocation
+    ValueAndX m_inlined[m_inlinedSize];  // Holds the beginning m_inlinedSize words
+    std::vector<ValueAndX> m_data;  // Holds m_inlinedSize-th word and later
+
+public:
+    // CONSTRUCTORS
+    V3NumberData() {
+        for (size_t i = 0; i < m_inlinedSize; ++i) m_inlined[i] = {0, 0};
+    }
+
+    // METHODS
+    void ensureSizeAtLeast(size_t s) {
+        if (VL_UNLIKELY(s > m_data.size() + m_inlinedSize)) m_data.resize(s - m_inlinedSize);
+    }
+    ValueAndX& operator[](size_t idx) {
+        UDEBUGONLY(UASSERT(idx < m_data.size() + m_inlinedSize,
+                           "idx:" << idx << " size:" << m_data.size()
+                                  << " inlinedSize:" << m_inlinedSize););
+        return idx >= m_inlinedSize ? m_data[idx - m_inlinedSize] : m_inlined[idx];
+    }
+    const ValueAndX& operator[](size_t idx) const { return const_cast<V3NumberData&>(*this)[idx]; }
+};
 
 class V3Number final {
+    // TYPES
+    using ValueAndX = V3NumberData::ValueAndX;
+
     // Large 4-state number handling
     int m_width;  // Width as specified/calculated.
     bool m_sized : 1;  // True if the user specified the width, else we track it.
@@ -51,8 +95,7 @@ class V3Number final {
     bool m_autoExtend : 1;  // True if SystemVerilog extend-to-any-width
     FileLine* m_fileline;
     AstNode* m_nodep;  // Parent node
-    std::vector<uint32_t> m_value;  // Value, with bit 0 in bit 0 of this vector (unless X/Z)
-    std::vector<uint32_t> m_valueX;  // Each bit is true if it's X or Z, 10=z, 11=x
+    V3NumberData m_value;  // Value and X/Z information
     string m_stringVal;  // If isString, the value of the string
     // METHODS
     V3Number& setSingleBits(char value);
@@ -74,18 +117,19 @@ public:
     void setBit(int bit, char value) {  // Note must be pre-zeroed!
         if (bit >= m_width) return;
         uint32_t mask = (1UL << (bit & 31));
+        ValueAndX& v = m_value[bit / 32];
         if (value == '0' || value == 0) {
-            m_value[bit / 32] &= ~mask;
-            m_valueX[bit / 32] &= ~mask;
+            v.m_value &= ~mask;
+            v.m_valueX &= ~mask;
         } else if (value == '1' || value == 1) {
-            m_value[bit / 32] |= mask;
-            m_valueX[bit / 32] &= ~mask;
+            v.m_value |= mask;
+            v.m_valueX &= ~mask;
         } else if (value == 'z' || value == 2) {
-            m_value[bit / 32] &= ~mask;
-            m_valueX[bit / 32] |= mask;
+            v.m_value &= ~mask;
+            v.m_valueX |= mask;
         } else {  // X
-            m_value[bit / 32] |= mask;
-            m_valueX[bit / 32] |= mask;
+            v.m_value |= mask;
+            v.m_valueX |= mask;
         }
     }
 
@@ -95,8 +139,9 @@ private:
             // We never sign extend
             return '0';
         }
-        return ("01zx"[(((m_value[bit / 32] & (1UL << (bit & 31))) ? 1 : 0)
-                        | ((m_valueX[bit / 32] & (1UL << (bit & 31))) ? 2 : 0))]);
+        const ValueAndX v = m_value[bit / 32];
+        return ("01zx"[(((v.m_value & (1UL << (bit & 31))) ? 1 : 0)
+                        | ((v.m_valueX & (1UL << (bit & 31))) ? 2 : 0))]);
     }
     char bitIsExtend(int bit, int lbits) const {
         // lbits usually = width, but for C optimizations width=32_bits, lbits = 32_or_less
@@ -104,49 +149,52 @@ private:
         UASSERT(lbits <= m_width, "Extend of wrong size");
         if (bit >= lbits) {
             bit = lbits ? lbits - 1 : 0;
+            const ValueAndX v = m_value[bit / 32];
             // We do sign extend
-            return ("01zx"[(((m_value[bit / 32] & (1UL << (bit & 31))) ? 1 : 0)
-                            | ((m_valueX[bit / 32] & (1UL << (bit & 31))) ? 2 : 0))]);
+            return ("01zx"[(((v.m_value & (1UL << (bit & 31))) ? 1 : 0)
+                            | ((v.m_valueX & (1UL << (bit & 31))) ? 2 : 0))]);
         }
-        return ("01zx"[(((m_value[bit / 32] & (1UL << (bit & 31))) ? 1 : 0)
-                        | ((m_valueX[bit / 32] & (1UL << (bit & 31))) ? 2 : 0))]);
+        const ValueAndX v = m_value[bit / 32];
+        return ("01zx"[(((v.m_value & (1UL << (bit & 31))) ? 1 : 0)
+                        | ((v.m_valueX & (1UL << (bit & 31))) ? 2 : 0))]);
     }
 
 public:
     bool bitIs0(int bit) const {
         if (bit < 0) return false;
         if (bit >= m_width) return !bitIsXZ(m_width - 1);
-        return ((m_value[bit / 32] & (1UL << (bit & 31))) == 0
-                && !(m_valueX[bit / 32] & (1UL << (bit & 31))));
+        const ValueAndX v = m_value[bit / 32];
+        return ((v.m_value & (1UL << (bit & 31))) == 0 && !(v.m_valueX & (1UL << (bit & 31))));
     }
     bool bitIs1(int bit) const {
         if (bit < 0) return false;
         if (bit >= m_width) return false;
-        return ((m_value[bit / 32] & (1UL << (bit & 31)))
-                && !(m_valueX[bit / 32] & (1UL << (bit & 31))));
+        const ValueAndX v = m_value[bit / 32];
+        return ((v.m_value & (1UL << (bit & 31))) && !(v.m_valueX & (1UL << (bit & 31))));
     }
     bool bitIs1Extend(int bit) const {
         if (bit < 0) return false;
         if (bit >= m_width) return bitIs1Extend(m_width - 1);
-        return ((m_value[bit / 32] & (1UL << (bit & 31)))
-                && !(m_valueX[bit / 32] & (1UL << (bit & 31))));
+        const ValueAndX v = m_value[bit / 32];
+        return ((v.m_value & (1UL << (bit & 31))) && !(v.m_valueX & (1UL << (bit & 31))));
     }
     bool bitIsX(int bit) const {
         if (bit < 0) return false;
         if (bit >= m_width) return bitIsZ(m_width - 1);
-        return ((m_value[bit / 32] & (1UL << (bit & 31)))
-                && (m_valueX[bit / 32] & (1UL << (bit & 31))));
+        const ValueAndX v = m_value[bit / 32];
+        return ((v.m_value & (1UL << (bit & 31))) && (v.m_valueX & (1UL << (bit & 31))));
     }
     bool bitIsXZ(int bit) const {
         if (bit < 0) return false;
         if (bit >= m_width) return bitIsXZ(m_width - 1);
-        return ((m_valueX[bit / 32] & (1UL << (bit & 31))));
+        const ValueAndX v = m_value[bit / 32];
+        return ((v.m_valueX & (1UL << (bit & 31))));
     }
     bool bitIsZ(int bit) const {
         if (bit < 0) return false;
         if (bit >= m_width) return bitIsZ(m_width - 1);
-        return ((~m_value[bit / 32] & (1UL << (bit & 31)))
-                && (m_valueX[bit / 32] & (1UL << (bit & 31))));
+        const ValueAndX v = m_value[bit / 32];
+        return ((~v.m_value & (1UL << (bit & 31))) && (v.m_valueX & (1UL << (bit & 31))));
     }
 
 private:
@@ -167,7 +215,7 @@ public:
     V3Number(AstNode* nodep, int width) { init(nodep, width); }  // 0=unsized
     V3Number(AstNode* nodep, int width, uint32_t value, bool sized = true) {
         init(nodep, width, sized);
-        m_value[0] = value;
+        m_value[0].m_value = value;
         opCleanThis();
     }
     // Create from a verilog 32'hxxxx number.
@@ -195,7 +243,7 @@ public:
     }
     V3Number(const V3Number* nump, int width, uint32_t value) {
         init(nullptr, width);
-        m_value[0] = value;
+        m_value[0].m_value = value;
         opCleanThis();
         m_fileline = nump->fileline();
     }
@@ -212,7 +260,7 @@ private:
         m_autoExtend = false;
         m_fromString = false;
         width(swidth, sized);
-        for (int i = 0; i < words(); ++i) m_value[i] = m_valueX[i] = 0;
+        for (int i = 0; i < words(); ++i) m_value[i] = {0, 0};
     }
     void setNames(AstNode* nodep);
     static string displayPad(size_t fmtsize, char pad, bool left, const string& in);
@@ -231,10 +279,7 @@ public:
             m_sized = false;
             m_width = 1;
         }
-        if (VL_UNLIKELY(m_value.size() < (unsigned)(words() + 1))) {
-            m_value.resize(words() + 1);
-            m_valueX.resize(words() + 1);
-        }
+        m_value.ensureSizeAtLeast(words());
     }
 
     // SETTERS
@@ -269,7 +314,8 @@ public:
     bool isFourState() const;
     bool hasZ() const {
         for (int i = 0; i < words(); i++) {
-            if ((~m_value[i]) & m_valueX[i]) return true;
+            const ValueAndX v = m_value[i];
+            if ((~v.m_value) & v.m_valueX) return true;
         }
         return false;
     }

From 708abe0dd1aa699da2c2cd44ca8f7f5ed1090f7d Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Mon, 21 Jun 2021 15:30:20 +0100
Subject: [PATCH 58/73] Introduce model interface class, make $root part or
 Syms (#3036)

This patch implements #3032. Verilator creates a module representing the
SystemVerilog $root scope (V3LinkLevel::wrapTop). Until now, this was
called the "TOP" module, which also acted as the user instantiated model
class. Syms used to hold a pointer to this root module, but hold
instances of any submodule. This patch renames this root scope module
from "TOP" to "$root", and introduces a separate model class which is
now an interface class. As the root module is no longer the user
interface class, it can now be made an instance of Syms, just like any
other submodule. This allows absolute references into the root module to
avoid an additional pointer indirection resulting in a potential speedup
(about 1.5% on OpenTitan). The model class now also contains all non
design specific generated code (e.g.: eval loops, trace config, etc),
which additionally simplifies Verilator internals.

Please see the updated documentation for the model interface changes.
---
 Changes                                       |   6 +
 docs/guide/connecting.rst                     | 109 ++-
 docs/guide/files.rst                          |  38 +-
 src/Makefile_obj.in                           |   5 +-
 src/V3Ast.h                                   |   2 +-
 src/V3AstNodes.cpp                            |  18 +-
 src/V3AstNodes.h                              |   3 +-
 src/V3Descope.cpp                             |   6 +-
 src/V3EmitC.cpp                               | 538 +--------------
 src/V3EmitC.h                                 |   1 +
 src/V3EmitCBase.cpp                           |  27 +-
 src/V3EmitCBase.h                             |  16 +-
 src/V3EmitCFunc.cpp                           |  25 -
 src/V3EmitCFunc.h                             |   3 +-
 src/V3EmitCModel.cpp                          | 633 ++++++++++++++++++
 src/V3EmitCSyms.cpp                           | 272 +++++---
 src/V3EmitXml.cpp                             |   9 +-
 src/V3File.cpp                                |   2 +-
 src/V3LinkDot.cpp                             |   9 +-
 src/V3LinkLevel.cpp                           |   4 +-
 src/V3Partition.cpp                           |  21 +-
 src/Verilator.cpp                             |   1 +
 test_regress/t/t_alw_noreorder.pl             |   4 +-
 test_regress/t/t_c_this.pl                    |   2 +-
 test_regress/t/t_debug_emitv.out              |   2 +-
 test_regress/t/t_dist_portability.pl          |   2 +-
 test_regress/t/t_emit_memb_limit.pl           |   2 +-
 test_regress/t/t_flag_comp_limit_parens.pl    |   2 +-
 test_regress/t/t_flag_csplit_off.pl           |   1 +
 test_regress/t/t_flag_xinitial_0.pl           |   2 +-
 test_regress/t/t_flag_xinitial_unique.pl      |   2 +-
 test_regress/t/t_foreach.pl                   |   8 +-
 test_regress/t/t_optm_if_array.pl             |   4 +-
 test_regress/t/t_optm_redor.pl                |   4 +-
 test_regress/t/t_protect_ids_key.out          |   3 +-
 test_regress/t/t_trace_two_cc.cpp             |   3 +-
 test_regress/t/t_trace_two_sc.cpp             |   3 +-
 test_regress/t/t_tri_inz.cpp                  |   3 +-
 .../t/t_unopt_converge_initial_run_bad.out    |   2 +-
 test_regress/t/t_unopt_converge_print_bad.out |   2 +-
 test_regress/t/t_unopt_converge_run_bad.out   |   2 +-
 test_regress/t/t_var_pins_cc.pl               |  24 +-
 test_regress/t/t_var_pins_sc1.pl              |  40 +-
 test_regress/t/t_var_pins_sc2.pl              |  40 +-
 test_regress/t/t_var_pins_sc32.pl             |  40 +-
 test_regress/t/t_var_pins_sc64.pl             |  40 +-
 test_regress/t/t_var_pins_sc_biguint.pl       |  40 +-
 test_regress/t/t_var_pins_sc_uint.pl          |  40 +-
 test_regress/t/t_var_pins_sc_uint_biguint.pl  |  40 +-
 test_regress/t/t_var_pins_scui.pl             |  32 +-
 test_regress/t/t_verilated_debug.out          |  34 +-
 test_regress/t/t_xml_flat.out                 |   4 +-
 test_regress/t/t_xml_flat_no_inline_mod.out   |   4 +-
 test_regress/t/t_xml_flat_pub_mod.out         |   4 +-
 test_regress/t/t_xml_flat_vlvbound.out        |   4 +-
 55 files changed, 1244 insertions(+), 943 deletions(-)
 create mode 100644 src/V3EmitCModel.cpp

diff --git a/Changes b/Changes
index 981f6211e..9445ee23a 100644
--- a/Changes
+++ b/Changes
@@ -15,6 +15,12 @@ Verilator 4.205 devel
 
 * Generated code is now emitted as global functions rather than methods. '$c'
   contents might need to be updated, see the docs (#3006). [Geza Lore]
+* The generated model class instantiated by the user is now an interface
+  object and no longer the TOP module instance.  User code with direct
+  C++ member access to model internals, including verilator public_flat
+  items will likely need to be updated. See the manual for instructions:
+  https://verilator.org/guide/latest/connecting.html#porting-from-pre-4-206
+  (#3036). [Geza Lore]
 
 **Minor:**
 
diff --git a/docs/guide/connecting.rst b/docs/guide/connecting.rst
index 720ecb8c1..32e1301ae 100644
--- a/docs/guide/connecting.rst
+++ b/docs/guide/connecting.rst
@@ -7,22 +7,86 @@
 Connecting to Verilated Models
 ******************************
 
+Structure of the Verilated Model
+================================
+
+Verilator outputs a :file:`{prefix}.h` header file which defines a class
+named :code:`{prefix}` which represents the generated model the user is
+supposed to instantiate.  This model class defines the interface of the
+Verilated model.
+
+Verilator will additionally create a :file:`{prefix}.cpp` file, together
+with additional .h and .cpp files for internals.  See the :file:`examples`
+directory in the kit for examples.  See :ref:`Files Read/Written` for
+information on all the files Verilator might output.
+
+The output of Verilator will contain a :file:`{prefix}.mk` file that may be
+used with Make to build a :file:`{prefix}__ALL.a` library with all required
+objects in it.
+
+The generated model class file manages all internal state required by the
+model, and exposes the following interface that allows interaction with the
+model:
+
+* Top level IO ports are exposed as references to the appropriate internal
+  equivalents.
+
+* Public top level module instances are exposed as pointers to allow access
+  to :code:`/* verilator public */` items.
+
+* The root of the design hierarchy (as in SystemVerilog :code:`$root`) is
+  exposed via the :code:`rootp` member pointer to allow access to model
+  internals, including :code:`/* verilator public_flat */` items.
+
+
+.. _Porting from pre 4.206:
+
+Model interface changes in version 4.206
+------------------------------------------
+
+Starting from version 4.206, the model class is an interface object.
+
+Up until Verilator version 4.204 inclusive, the generated model class was
+also the instance of the top level instance in the design hierarchy (what
+you would refer to with :code:`$root` in SystemVerilog).  This meant that
+all internal variables that were implemented by Verilator in the root scope
+were accessible as members of the model class itself.  Note there were often
+many such variable due to module inlining, including :code:`/* verilator
+public_flat */` items.
+
+This means that user code that accesses internal signals in the model
+(likely including :code:`/* verilator public_flat */` signals, as they are
+often inlined into the root scope) will need to be updated as follows:
+
+* No change required for accessing top level IO signals. These are directly
+  accessible in the model class via references.
+
+* No change required for accessing :code:`/* verilator public */` items.
+  These are directly accessible via sub-module pointers in the model class.
+
+* Accessing any other internal members, including
+  :code:`/* verilator public_flat */` items requires the following changes:
+
+  * Additionally include :file:`{prefix}___024root.h`. This header defines
+    type of the :code:`rootp` pointer within the model class. Note the
+    :code:`__024` substring is the Verilator escape sequence for the
+    :code:`$` character, i.e.: :code:`rootp` points to the Verilated
+    SystemVerilog :code:`$root` scope.
+
+  * Replace :code:`modelp->internal->member->lookup` references with
+    :code:`modelp->rootp->internal->member->lookup` references, which
+    contain one additional indirection via the :code:`rootp` pointer.
+
+
 .. _Connecting to C++:
 
 Connecting to C++
 =================
 
-Verilator creates a :file:`{prefix}.h` and :file:`{prefix}.cpp` file for
-the top level module, together with additional .h and .cpp files for
-internals. See the :file:`examples` directory in the kit for examples.  See
-:ref:`Files Read/Written` for information on all the files it writes.
-
-After the model is created, there will be a :file:`{prefix}.mk` file that
-may be used with Make to produce a :file:`{prefix}__ALL.a` file with all
-required objects in it.
-
-The user must write a C++ wrapper and main loop for the simulation, to link
-with the Verilated model.  Here is a simple example:
+In C++ output mode (:vlopt:`--cc`), the Verilator generated model class is a
+simple C++ class.  The user must write a C++ wrapper and main loop for the
+simulation, which instantiates the model class, and link with the Verilated
+model.  Here is a simple example:
 
 .. code-block:: C++
 
@@ -30,7 +94,7 @@ with the Verilated model.  Here is a simple example:
          #include <iostream>             // Need std::cout
          #include "Vtop.h"               // From Verilating "top.v"
 
-         Vtop *top;                      // Instantiation of module
+         Vtop *top;                      // Instantiation of model
 
          vluint64_t main_time = 0;       // Current simulation time
          // This is a 64-bit integer to reduce wrap over issues and
@@ -45,7 +109,7 @@ with the Verilated model.  Here is a simple example:
          int main(int argc, char** argv) {
              Verilated::commandArgs(argc, argv);   // Remember args
 
-             top = new Vtop;             // Create instance
+             top = new Vtop;             // Create model
 
              top->reset_l = 0;           // Set some inputs
 
@@ -70,17 +134,18 @@ with the Verilated model.  Here is a simple example:
          }
 
 
-Note signals are read and written as member variables of the model.  You
-call the :code:`eval()` method to evaluate the model.  When the simulation
-is complete call the :code:`final()` method to execute any SystemVerilog
-final blocks, and complete any assertions. See :ref:`Evaluation Loop`.
+Note top level IO signals are read and written as members of the model.  You
+call the :code:`eval()` method to evaluate the model.  When the simulation is
+complete call the :code:`final()` method to execute any SystemVerilog final
+blocks, and complete any assertions. See :ref:`Evaluation Loop`.
 
 
 Connecting to SystemC
 =====================
 
-Verilator will convert the top level module to a SC_MODULE.  This module
-will attach directly into a SystemC netlist as an instantiation.
+In SystemC output mode (:vlopt:`--sc`), the Verilator generated model class
+is a SystemC SC_MODULE.  This module will attach directly into a SystemC
+netlist as an instantiation.
 
 The SC_MODULE gets the same pinout as the Verilog module, with the
 following type conversions: Pins of a single bit become bool.  Pins 2-32
@@ -88,9 +153,9 @@ bits wide become uint32_t's.  Pins 33-64 bits wide become sc_bv's or
 vluint64_t's depending on the :vlopt:`--no-pins64` option.  Wider pins
 become sc_bv's.  (Uints simulate the fastest so are used where possible.)
 
-Lower modules are not pure SystemC code.  This is a feature, as using the
-SystemC pin interconnect scheme everywhere would reduce performance by an
-order of magnitude.
+Model internals, including lower level sub-modules are not pure SystemC
+code.  This is a feature, as using the SystemC pin interconnect scheme
+everywhere would reduce performance by an order of magnitude.
 
 
 Direct Programming Interface (DPI)
diff --git a/docs/guide/files.rst b/docs/guide/files.rst
index cc2dca400..692f3e937 100644
--- a/docs/guide/files.rst
+++ b/docs/guide/files.rst
@@ -54,32 +54,38 @@ For --cc/--sc, it creates:
      - Arguments for hierarchical Verilation (from --make gmake)
    * - *{prefix}*\ _hierCMakeArgs.f
      - Arguments for hierarchical Verilation (from --make cmake)
-   * - *{prefix}*\ .cpp
-     - Top level C++ file
-   * - *{prefix}{__n}*\ .cpp
-     - Additional top C++ files (from --output-split)
    * - *{prefix}*\ .h
-     - Top level header
-   * - *{prefix}*\ __Slow\ *{__n}*\ .cpp
+     - Model header
+   * - *{prefix}*\ .cpp
+     - Model C++ file
+   * - *{prefix}*\ ___024root.h
+     - Top level (SystemVerilog $root) internal header file
+   * - *{prefix}*\ ___024root.cpp
+     - Top level (SystemVerilog $root) internal C++ file
+   * - *{prefix}*___024root*{__n}*\ .cpp
+     - Additional top level internal C++ files (from --output-split)
+   * - *{prefix}*\ ___024root__Slow\ *{__n}*\ .cpp
      - Infrequent cold routines
-   * - *{prefix}*\ __Dpi.cpp
-     - DPI import and export wrappers (from --dpi)
+   * - *{prefix}*\ ___024root__Trace{__n}*\ .cpp
+     - Wave file generation code (from --trace)
+   * - *{prefix}*\ ___024root__Trace__Slow{__n}*\ .cpp
+     - Wave file generation code (from --trace)
    * - *{prefix}*\ __Dpi.h
      - DPI import and export declarations (from --dpi)
+   * - *{prefix}*\ __Dpi.cpp
+     - Global DPI export wrappers (from --dpi)
+   * - *{prefix}*\ __Dpi_Export\ *{__n}\ .cpp
+     - DPI export wrappers scoped to this particular model (from --dpi)
    * - *{prefix}*\ __Inlines.h
      - Inline support functions
-   * - *{prefix}*\ __Syms.cpp
-     - Global symbol table C++
    * - *{prefix}*\ __Syms.h
      - Global symbol table header
-   * - *{prefix}*\ __Trace{__n}*\ .cpp
-     - Wave file generation code (from --trace)
-   * - *{prefix}*\ __Trace__Slow{__n}*\ .cpp
-     - Wave file generation code (from --trace)
-   * - *{prefix}{each_verilog_module}*\ .cpp
-     - Lower level internal C++ files
+   * - *{prefix}*\ __Syms.cpp
+     - Global symbol table C++
    * - *{prefix}{each_verilog_module}*\ .h
      - Lower level internal header files
+   * - *{prefix}{each_verilog_module}*\ .cpp
+     - Lower level internal C++ files
    * - *{prefix}{each_verilog_module}{__n}*\ .cpp
      - Additional lower C++ files (from --output-split)
 
diff --git a/src/Makefile_obj.in b/src/Makefile_obj.in
index 9216ba3ff..47288dec6 100644
--- a/src/Makefile_obj.in
+++ b/src/Makefile_obj.in
@@ -184,9 +184,10 @@ RAW_OBJS = \
 	V3EmitCConstPool.o \
 	V3EmitCFunc.o \
 	V3EmitCInlines.o \
-	V3EmitCSyms.o \
-	V3EmitCMake.o \
 	V3EmitCMain.o \
+	V3EmitCMake.o \
+	V3EmitCModel.o \
+	V3EmitCSyms.o \
 	V3EmitMk.o \
 	V3EmitV.o \
 	V3EmitXml.o \
diff --git a/src/V3Ast.h b/src/V3Ast.h
index 3c92a9a3a..afa26f75d 100644
--- a/src/V3Ast.h
+++ b/src/V3Ast.h
@@ -1880,7 +1880,7 @@ public:
     virtual void dump(std::ostream& str) const override;
     virtual bool hasDType() const override { return true; }
     virtual string emitVerilog() = 0;  /// Format string for verilog writing; see V3EmitV
-    // For documentation on emitC format see EmitCStmts::emitOpName
+    // For documentation on emitC format see EmitCFunc::emitOpName
     virtual string emitC() = 0;
     virtual string emitSimpleOperator() { return ""; }  // "" means not ok to use
     virtual bool emitCheckMaxWords() { return false; }  // Check VL_MULS_MAX_WORDS
diff --git a/src/V3AstNodes.cpp b/src/V3AstNodes.cpp
index 9bb1d5067..d51f70fae 100644
--- a/src/V3AstNodes.cpp
+++ b/src/V3AstNodes.cpp
@@ -337,14 +337,15 @@ string AstVar::verilogKwd() const {
     }
 }
 
-string AstVar::vlArgType(bool named, bool forReturn, bool forFunc, const string& namespc) const {
+string AstVar::vlArgType(bool named, bool forReturn, bool forFunc, const string& namespc,
+                         bool asRef) const {
     UASSERT_OBJ(!forReturn, this,
                 "Internal data is never passed as return, but as first argument");
     string ostatic;
     if (isStatic() && namespc.empty()) ostatic = "static ";
 
-    const bool isRef
-        = isDpiOpenArray() || (forFunc && (isWritable() || direction().isRefOrConstRef()));
+    const bool isRef = isDpiOpenArray()
+                       || (forFunc && (isWritable() || direction().isRefOrConstRef())) || asRef;
 
     if (forFunc && isReadOnly() && isRef) ostatic = ostatic + "const ";
 
@@ -641,8 +642,15 @@ public:
     string render(const string& name, bool isRef) const {
         string out;
         out += m_type;
-        if (name != "") out += " ";
-        out += isRef ? "(&" + name + ")" : name;
+        if (!name.empty()) out += " ";
+        if (isRef) {
+            if (!m_dims.empty()) out += "(";
+            out += "&";
+            out += name;
+            if (!m_dims.empty()) out += ")";
+        } else {
+            out += name;
+        }
         out += m_dims;
         return out;
     }
diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index 4fe2c3950..731bcc1dc 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -2059,7 +2059,8 @@ public:
     string dpiArgType(bool named, bool forReturn) const;  // Return DPI-C type for argument
     string dpiTmpVarType(const string& varName) const;
     // Return Verilator internal type for argument: CData, SData, IData, WData
-    string vlArgType(bool named, bool forReturn, bool forFunc, const string& namespc = "") const;
+    string vlArgType(bool named, bool forReturn, bool forFunc, const string& namespc = "",
+                     bool asRef = false) const;
     string vlEnumType() const;  // Return VerilatorVarType: VLVT_UINT32, etc
     string vlEnumDir() const;  // Return VerilatorVarDir: VLVD_INOUT, etc
     string vlPropDecl(const string& propName) const;  // Return VerilatorVarProps declaration
diff --git a/src/V3Descope.cpp b/src/V3Descope.cpp
index b6057ae85..9b2e2cf76 100644
--- a/src/V3Descope.cpp
+++ b/src/V3Descope.cpp
@@ -98,11 +98,7 @@ private:
         } else {
             // Reference to something elsewhere, or relative references are disabled. Use global
             // variable
-            if (scopep->isTop()) {  // Top
-                return "vlSymsp->TOPp";
-            } else {
-                return "(&" + scopep->nameVlSym() + ")";
-            }
+            return "(&" + scopep->nameVlSym() + ")";
         }
     }
 
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index 1532fb7c7..b2f345698 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -24,7 +24,7 @@
 #include <vector>
 #include <unordered_set>
 
-//###################################################################### >
+//######################################################################
 // Internal EmitC implementation
 
 class EmitCImp final : EmitCFunc {
@@ -60,24 +60,12 @@ class EmitCImp final : EmitCFunc {
         }
 
         ofp->putsHeader();
-        if (m_fileModp->isTop() && !source) {
-            ofp->puts("// DESCR"
-                      "IPTION: Verilator output: Primary design header\n");
-            ofp->puts("//\n");
-            ofp->puts("// This header should be included by all source files instantiating the "
-                      "design.\n");
-            ofp->puts("// The class here is then constructed to instantiate the design.\n");
-            ofp->puts("// See the Verilator manual for examples.\n");
+        if (source) {
+            ofp->puts("// DESCRIPTION: Verilator output: Design implementation internals\n");
         } else {
-            if (source) {
-                ofp->puts("// DESCR"
-                          "IPTION: Verilator output: Design implementation internals\n");
-            } else {
-                ofp->puts("// DESCR"
-                          "IPTION: Verilator output: Design internal header\n");
-            }
-            ofp->puts("// See " + v3Global.opt.prefix() + ".h for the primary calling header\n");
+            ofp->puts("// DESCRIPTION: Verilator output: Design internal header\n");
         }
+        ofp->puts("// See " + topClassName() + ".h for the primary calling header\n");
         return ofp;
     }
 
@@ -88,6 +76,7 @@ class EmitCImp final : EmitCFunc {
         // TRACE_* and DPI handled elsewhere
         if (nodep->funcType().isTrace()) return;
         if (nodep->dpiImportPrototype()) return;
+        if (nodep->dpiExportDispatcher()) return;
         if (!(nodep->slow() ? m_slow : m_fast)) return;
 
         maybeSplit();
@@ -192,7 +181,33 @@ class EmitCImp final : EmitCFunc {
         }
         if (anyi) puts("\n");
     }
-    void emitSensitives();
+    void emitIntFuncDecls(AstNodeModule* modp, bool inClassBody) {
+        std::vector<const AstCFunc*> funcsp;
+
+        for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
+            if (const AstCFunc* funcp = VN_CAST(nodep, CFunc)) {
+                if (funcp->dpiImportPrototype())  // Declared in __Dpi.h
+                    continue;
+                if (funcp->dpiExportDispatcher())  // Declared in __Dpi.h
+                    continue;
+                if (funcp->isMethod() != inClassBody)  // Only methods go inside class
+                    continue;
+                if (funcp->isMethod() && funcp->isLoose())  // Loose methods are declared lazily
+                    continue;
+                funcsp.push_back(funcp);
+            }
+        }
+
+        stable_sort(funcsp.begin(), funcsp.end(), [](const AstNode* ap, const AstNode* bp) {  //
+            return ap->name() < bp->name();
+        });
+
+        for (const AstCFunc* funcp : funcsp) {
+            if (inClassBody) ofp()->putsPrivate(funcp->declPrivate());
+            emitCFuncDecl(funcp, modp);
+        }
+    }
+
     // Medium level
     void emitCtorImp(AstNodeModule* modp);
     void emitConfigureImp(AstNodeModule* modp);
@@ -204,11 +219,6 @@ class EmitCImp final : EmitCFunc {
     // High level
     void emitImpTop();
     void emitImp(AstNodeModule* modp);
-    void emitSettleLoop(bool initial);
-    void emitWrapEval();
-    void emitWrapFast();
-    void emitThreadingState();
-    void emitThreadingCtors(bool* firstp);
     void emitIntTop(const AstNodeModule* modp);
     void emitInt(AstNodeModule* modp);
     void maybeSplit();
@@ -236,19 +246,6 @@ void EmitCImp::emitCoverageDecl(AstNodeModule*) {
     }
 }
 
-void EmitCImp::emitThreadingCtors(bool* firstp) {
-    ofp()->indentInc();
-    emitCtorSep(firstp);
-    puts("__Vm_threadPoolp(nullptr)");
-    emitCtorSep(firstp);
-    puts("__Vm_even_cycle(false)");
-    if (v3Global.opt.profThreads()) {
-        emitCtorSep(firstp);
-        puts("__Vm_profile_cycle_start(0)");
-    }
-    ofp()->indentDec();
-}
-
 void EmitCImp::emitCtorImp(AstNodeModule* modp) {
     puts("\n");
     bool first = true;
@@ -264,62 +261,19 @@ void EmitCImp::emitCtorImp(AstNodeModule* modp) {
 
     if (VN_IS(modp, Class)) {
         modp->v3fatalSrc("constructors should be AstCFuncs instead");
-    } else if (optSystemC() && modp->isTop()) {
-        puts(modName + "::" + modName + "(sc_module_name)");
-    } else if (modp->isTop()) {
-        puts(modName + "::" + modName
-             + "(VerilatedContext* _vcontextp__, const char* _vcname__)\n");
-        puts("    : VerilatedModule{_vcname__}\n");
-        first = false;  // printed the first ':'
     } else {
         puts(modName + "::" + modName + "(const char* _vcname__)\n");
         puts("    : VerilatedModule(_vcname__)\n");
         first = false;  // printed the first ':'
     }
     emitVarCtors(&first);
-    if (modp->isTop() && v3Global.opt.mtasks()) emitThreadingCtors(&first);
 
     puts(" {\n");
 
-    if (modp->isTop()) {
-        putsDecoration("// Create Sym instance\n");
-        // Must be before other constructors, as __vlCoverInsert calls it.
-        // Note _vcontextp__ may be nullptr, VerilatedSyms::VerilatedSyms cleans it up
-        puts(EmitCBaseVisitor::symClassVar() + " = new " + symClassName() + "("
-             + (optSystemC() ? "nullptr" : "_vcontextp__") + ", this, name());\n");
-    }
-
-    emitSensitives();
-
     putsDecoration("// Reset structure values\n");
     puts(modName + "__" + protect("_ctor_var_reset") + "(this);\n");
     emitTextSection(AstType::atScCtor);
 
-    if (modp->isTop() && v3Global.opt.mtasks()) {
-        // TODO-- For now each top module creates its own ThreadPool here,
-        // and deletes it in the destructor. If A and B are each top level
-        // modules, each creates a separate thread pool.  This allows
-        // A.eval() and B.eval() to run concurrently without any
-        // interference -- so long as the physical machine has enough cores
-        // to support both pools and all testbench threads.
-        //
-        // In the future, we might want to let the client provide a
-        // threadpool to the constructor. This would allow two or more
-        // models to share a single threadpool.
-        //
-        // For example: suppose models A and B are each compiled to run on
-        // 4 threads. The client might create a single thread pool with 3
-        // threads and pass it to both models. If the client can ensure that
-        // A.eval() and B.eval() do NOT run concurrently, there will be no
-        // contention for the threads. This mode is missing for now.  (Is
-        // there demand for such a setup?)
-        puts("__Vm_threadPoolp = new VlThreadPool("
-             // Note we create N-1 threads in the thread pool. The thread
-             // that calls eval() becomes the final Nth thread for the
-             // duration of the eval call.
-             + string("vlSymsp->_vm_contextp__, ") + cvtToStr(v3Global.opt.threads() - 1) + ", "
-             + cvtToStr(v3Global.opt.profThreads()) + ");\n");
-    }
     puts("}\n");
 }
 
@@ -382,19 +336,7 @@ void EmitCImp::emitCoverageImp(AstNodeModule*) {
 void EmitCImp::emitDestructorImp(AstNodeModule* modp) {
     puts("\n");
     puts(prefixNameProtect(modp) + "::~" + prefixNameProtect(modp) + "() {\n");
-    if (modp->isTop()) {
-        if (v3Global.opt.mtasks()) {
-            puts("VL_DO_CLEAR(delete __Vm_threadPoolp, __Vm_threadPoolp = nullptr);\n");
-        }
-        // Call via function in __Trace.cpp as this .cpp file does not have trace header
-        if (v3Global.needTraceDumper()) {
-            puts("#ifdef VM_TRACE\n");
-            puts("if (VL_UNLIKELY(vlSymsp->__Vm_dumping)) _traceDumpClose();\n");
-            puts("#endif  // VM_TRACE\n");
-        }
-    }
     emitTextSection(AstType::atScDtor);
-    if (modp->isTop()) puts("VL_DO_CLEAR(delete vlSymsp, vlSymsp = nullptr);\n");
     puts("}\n");
     splitSizeInc(10);
 }
@@ -476,9 +418,6 @@ void EmitCImp::emitSavableImp(AstNodeModule* modp) {
                 }
             }
 
-            if (modp->isTop()) {  // Save the children
-                puts("vlSymsp->" + protect(funcname) + "(os);\n");
-            }
             puts("}\n");
         }
     }
@@ -505,216 +444,6 @@ void EmitCImp::emitTextSection(AstType type) {
     if (last_line > 0) puts("//*** Above code from `systemc in Verilog file\n\n");
 }
 
-void EmitCImp::emitSensitives() {
-    // Create sensitivity list for when to evaluate the model.
-    // If C++ code, the user must call this routine themself.
-    if (m_modp->isTop() && optSystemC()) {
-        putsDecoration("// Sensitivities on all clocks and combo inputs\n");
-        puts("SC_METHOD(eval);\n");
-        for (AstNode* nodep = m_modp->stmtsp(); nodep; nodep = nodep->nextp()) {
-            if (const AstVar* varp = VN_CAST(nodep, Var)) {
-                if (varp->isNonOutput() && (varp->isScSensitive() || varp->isUsedClock())) {
-                    int vects = 0;
-                    // This isn't very robust and may need cleanup for other data types
-                    for (AstUnpackArrayDType* arrayp
-                         = VN_CAST(varp->dtypeSkipRefp(), UnpackArrayDType);
-                         arrayp;
-                         arrayp = VN_CAST(arrayp->subDTypep()->skipRefp(), UnpackArrayDType)) {
-                        const int vecnum = vects++;
-                        UASSERT_OBJ(arrayp->hi() >= arrayp->lo(), varp,
-                                    "Should have swapped msb & lsb earlier.");
-                        const string ivar = string("__Vi") + cvtToStr(vecnum);
-                        puts("for (int __Vi" + cvtToStr(vecnum) + "=" + cvtToStr(arrayp->lo()));
-                        puts("; " + ivar + "<=" + cvtToStr(arrayp->hi()));
-                        puts("; ++" + ivar + ") {\n");
-                    }
-                    puts("sensitive << " + varp->nameProtect());
-                    for (int v = 0; v < vects; ++v) puts("[__Vi" + cvtToStr(v) + "]");
-                    puts(";\n");
-                    for (int v = 0; v < vects; ++v) puts("}\n");
-                }
-            }
-        }
-        puts("\n");
-    }
-}
-
-void EmitCImp::emitSettleLoop(bool initial) {
-    const string self = initial ? "vlSelf" : "this";
-    putsDecoration("// Evaluate till stable\n");
-    puts("int __VclockLoop = 0;\n");
-    puts("QData __Vchange = 1;\n");
-    if (v3Global.opt.trace()) puts("vlSymsp->__Vm_activity = true;\n");
-    puts("do {\n");
-    puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+ ");
-    puts(initial ? "Initial" : "Clock");
-    puts(" loop\\n\"););\n");
-    if (initial) puts(topClassName() + "__" + protect("_eval_settle") + "(" + self + ");\n");
-    puts(topClassName() + "__" + protect("_eval") + "(" + self + ");\n");
-    puts("if (VL_UNLIKELY(++__VclockLoop > " + cvtToStr(v3Global.opt.convergeLimit()) + ")) {\n");
-    puts("// About to fail, so enable debug to see what's not settling.\n");
-    puts("// Note you must run make with OPT=-DVL_DEBUG for debug prints.\n");
-    puts("int __Vsaved_debug = Verilated::debug();\n");
-    puts("Verilated::debug(1);\n");
-    puts("__Vchange = " + topClassName() + "__" + protect("_change_request") + "(" + self
-         + ");\n");
-    puts("Verilated::debug(__Vsaved_debug);\n");
-    puts("VL_FATAL_MT(");
-    putsQuoted(protect(m_modp->fileline()->filename()));
-    puts(", ");
-    puts(cvtToStr(m_modp->fileline()->lineno()));
-    puts(", \"\",\n");
-    puts("\"Verilated model didn't ");
-    if (initial) puts("DC ");
-    puts("converge\\n\"\n");
-    puts("\"- See https://verilator.org/warn/DIDNOTCONVERGE\");\n");
-    puts("} else {\n");
-    puts("__Vchange = " + topClassName() + "__" + protect("_change_request") + "(" + self
-         + ");\n");
-    puts("}\n");
-    puts("} while (VL_UNLIKELY(__Vchange));\n");
-}
-
-void EmitCImp::emitWrapFast() {
-    UASSERT_OBJ(m_modp->isTop(), m_modp, "Attempting to emitWrapFast for non-top class");
-    puts("\nVerilatedContext* " + topClassName() + "::contextp() const {\n");
-    puts(/**/ "return vlSymsp->_vm_contextp__;\n");
-    puts("}\n");
-}
-
-void EmitCImp::emitWrapEval() {
-    UASSERT_OBJ(m_modp->isTop(), m_modp, "Attempting to emitWrapEval for non-top class");
-
-    const string selfDecl = "(" + topClassName() + "* vlSelf)";
-
-    // Forward declarations
-    puts("\n");
-    m_lazyDecls.emit("void " + topClassName() + "__", protect("_eval_initial"), selfDecl + ";");
-    m_lazyDecls.emit("void " + topClassName() + "__", protect("_eval_settle"), selfDecl + ";");
-    m_lazyDecls.emit("void " + topClassName() + "__", protect("_eval"), selfDecl + ";");
-    m_lazyDecls.emit("QData " + topClassName() + "__", protect("_change_request"), selfDecl + ";");
-    puts("#ifdef VL_DEBUG\n");
-    m_lazyDecls.emit("void " + topClassName() + "__", protect("_eval_debug_assertions"),
-                     selfDecl + ";");
-    puts("#endif  // VL_DEBUG\n");
-    m_lazyDecls.emit("void " + topClassName() + "__", protect("_final"), selfDecl + ";");
-
-    // _eval_initial_loop
-    puts("\nstatic void " + protect("_eval_initial_loop") + selfDecl + " {\n");
-    puts(symClassAssign());
-    puts("vlSymsp->__Vm_didInit = true;\n");
-    puts(topClassName() + "__" + protect("_eval_initial") + "(vlSelf);\n");
-    emitSettleLoop(/* initial: */ true);
-    ensureNewLine();
-    puts("}\n");
-
-    // ::eval_step
-    puts("\nvoid " + topClassName() + "::eval_step() {\n");
-    puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+++++TOP Evaluate " + topClassName()
-         + "::eval_step\\n\"); );\n");
-    puts("#ifdef VL_DEBUG\n");
-    putsDecoration("// Debug assertions\n");
-    puts(topClassName() + "__" + protect("_eval_debug_assertions") + "(this);\n");
-    puts("#endif  // VL_DEBUG\n");
-    putsDecoration("// Initialize\n");
-    puts("if (VL_UNLIKELY(!vlSymsp->__Vm_didInit)) " + protect("_eval_initial_loop")
-         + "(this);\n");
-
-    if (v3Global.opt.threads() == 1) {
-        uint32_t mtaskId = 0;
-        putsDecoration("// MTask " + cvtToStr(mtaskId) + " start\n");
-        puts("VL_DEBUG_IF(VL_DBG_MSGF(\"MTask" + cvtToStr(mtaskId) + " starting\\n\"););\n");
-        puts("Verilated::mtaskId(" + cvtToStr(mtaskId) + ");\n");
-    }
-
-    if (v3Global.opt.mtasks() && v3Global.opt.profThreads()) {
-        puts("if (VL_UNLIKELY((vlSymsp->_vm_contextp__->profThreadsStart() != "
-             "__Vm_profile_time_finished)\n");
-        puts(" && (VL_TIME_Q() > vlSymsp->_vm_contextp__->profThreadsStart())\n");
-        puts(" && (vlSymsp->_vm_contextp__->profThreadsWindow() >= 1))) {\n");
-        // Within a profile (either starting, middle, or end)
-        puts("if (__Vm_profile_window_ct == 0) {\n");  // Opening file?
-        // Start profile on this cycle. We'll capture a window worth, then
-        // only analyze the next window worth. The idea is that the first window
-        // capture will hit some cache-cold stuff (eg printf) but it'll be warm
-        // by the time we hit the second window, we hope.
-        puts("__Vm_profile_cycle_start = VL_RDTSC_Q();\n");
-        // "* 2" as first half is warmup, second half is collection
-        puts("__Vm_profile_window_ct = vlSymsp->_vm_contextp__->profThreadsWindow() * 2 "
-             "+ "
-             "1;\n");
-        puts("}\n");
-        puts("--__Vm_profile_window_ct;\n");
-        puts("if (__Vm_profile_window_ct == vlSymsp->_vm_contextp__->profThreadsWindow()) "
-             "{\n");
-        // This barrier record in every threads' profile demarcates the
-        // cache-warm-up cycles before the barrier from the actual profile
-        // cycles afterward.
-        puts("__Vm_threadPoolp->profileAppendAll(");
-        puts("VlProfileRec(VlProfileRec::Barrier()));\n");
-        puts("__Vm_profile_cycle_start = VL_RDTSC_Q();\n");
-        puts("}\n");
-        puts("else if (__Vm_profile_window_ct == 0) {\n");
-        // Ending file.
-        puts("vluint64_t elapsed = VL_RDTSC_Q() - __Vm_profile_cycle_start;\n");
-        puts("__Vm_threadPoolp->profileDump(vlSymsp->_vm_contextp__->profThreadsFilename()."
-             "c_str(), elapsed);\n");
-        // This turns off the test to enter the profiling code, but still
-        // allows the user to collect another profile by changing
-        // profThreadsStart
-        puts("__Vm_profile_time_finished = vlSymsp->_vm_contextp__->profThreadsStart();\n");
-        puts("__Vm_profile_cycle_start = 0;\n");
-        puts("}\n");
-        puts("}\n");
-    }
-
-    emitSettleLoop(/* initial: */ false);
-    if (v3Global.opt.threads() == 1) {
-        puts("Verilated::endOfThreadMTask(vlSymsp->__Vm_evalMsgQp);\n");
-    }
-    if (v3Global.opt.threads()) puts("Verilated::endOfEval(vlSymsp->__Vm_evalMsgQp);\n");
-    puts("}\n");
-    splitSizeInc(10);
-
-    // ::eval_end_step
-    if (v3Global.needTraceDumper() && !optSystemC()) {
-        puts("\nvoid " + topClassName() + "::eval_end_step() {\n");
-        puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+eval_end_step " + topClassName()
-             + "::eval_end_step\\n\"); );\n");
-        puts("#ifdef VM_TRACE\n");
-        putsDecoration("// Tracing\n");
-        // SystemC's eval loop deals with calling trace, not us
-        puts("if (VL_UNLIKELY(vlSymsp->__Vm_dumping)) _traceDump();\n");
-        puts("#endif  // VM_TRACE\n");
-        puts("}\n");
-        splitSizeInc(10);
-    }
-
-    // ::final
-    puts("\nvoid " + topClassName() + "::final() {\n");
-    puts(topClassName() + "__" + protect("_final") + "(this);\n");
-    puts("}\n");
-    splitSizeInc(10);
-}
-
-void EmitCImp::emitThreadingState() {
-    ofp()->putsPrivate(false);  // Accessed from loose function
-    AstExecGraph* execGraphp = v3Global.rootp()->execGraphp();
-    UASSERT_OBJ(execGraphp, v3Global.rootp(), "Root should have an execGraphp");
-
-    puts("VlThreadPool* __Vm_threadPoolp;\n");
-    puts("bool __Vm_even_cycle;\n");
-
-    if (v3Global.opt.profThreads()) {
-        // rdtsc() at current cycle start
-        puts("vluint64_t __Vm_profile_cycle_start = 0;\n");
-        // Time we finished analysis
-        puts("vluint64_t __Vm_profile_time_finished = 0;\n");
-        // Track our position in the cache warmup and actual profile window
-        puts("vluint32_t __Vm_profile_window_ct = 0;\n");
-    }
-}
-
 void EmitCImp::emitIntTop(const AstNodeModule* modp) {
     // Always have this first; gcc has short circuiting if #ifdef is first in a file
     ofp()->putsGuard();
@@ -729,11 +458,6 @@ void EmitCImp::emitIntTop(const AstNodeModule* modp) {
     if (v3Global.opt.mtasks()) puts("#include \"verilated_threads.h\"\n");
     if (v3Global.opt.savable()) puts("#include \"verilated_save.h\"\n");
     if (v3Global.opt.coverage()) puts("#include \"verilated_cov.h\"\n");
-    if (v3Global.dpi() && modp->isTop()) {
-        // do this before including our main .h file so that any references to
-        // types defined in svdpi.h are available
-        puts("#include \"svdpi.h\"\n");
-    }
 }
 
 void EmitCImp::emitInt(AstNodeModule* modp) {
@@ -759,8 +483,6 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
         if (classp->extendsp())
             puts(" : public " + prefixNameProtect(classp->extendsp()->classp()));
         puts(" {\n");
-    } else if (optSystemC() && modp->isTop()) {
-        puts("SC_MODULE(" + prefixNameProtect(modp) + ") {\n");
     } else {
         puts("VL_MODULE(" + prefixNameProtect(modp) + ") {\n");
     }
@@ -774,10 +496,6 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
                 if (!did) {
                     did = true;
                     putsDecoration("// CELLS\n");
-                    if (modp->isTop()) {
-                        puts("// Public to allow access to /*verilator_public*/ items;\n");
-                        puts("// otherwise the application code can consider these internals.\n");
-                    }
                 }
                 puts(prefixNameProtect(cellp->modp()) + "* " + cellp->nameProtect() + ";\n");
             }
@@ -788,35 +506,23 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
 
     string section;
     section = "\n// PORTS\n";
-    if (modp->isTop()) {
-        section += ("// The application code writes and reads these signals to\n"
-                    "// propagate new values into/out from the Verilated model.\n");
-    }
     emitVarList(modp->stmtsp(), EVL_CLASS_IO, "", section /*ref*/);
 
     section = "\n// LOCAL SIGNALS\n";
-    if (modp->isTop()) section += "// Internals; generally not touched by application code\n";
     emitVarList(modp->stmtsp(), EVL_CLASS_SIG, "", section /*ref*/);
 
     section = "\n// LOCAL VARIABLES\n";
-    if (modp->isTop()) section += "// Internals; generally not touched by application code\n";
     emitVarList(modp->stmtsp(), EVL_CLASS_TEMP, "", section /*ref*/);
 
     puts("\n// INTERNAL VARIABLES\n");
-    if (modp->isTop()) puts("// Internals; generally not touched by application code\n");
     if (!VN_IS(modp, Class)) {  // Avoid clang unused error (& don't want in every object)
         ofp()->putsPrivate(false);  // public: so loose methods can pick it up
         puts(symClassName() + "* vlSymsp;  // Symbol table\n");
     }
     ofp()->putsPrivate(false);  // public:
-    if (modp->isTop()) {
-        if (v3Global.opt.mtasks()) emitThreadingState();
-    }
     emitCoverageDecl(modp);  // may flip public/private
 
     section = "\n// PARAMETERS\n";
-    if (modp->isTop())
-        section += "// Parameters marked /*verilator public*/ for use by application code\n";
     ofp()->putsPrivate(false);  // public:
     emitVarList(modp->stmtsp(), EVL_CLASS_PAR, "",
                 section /*ref*/);  // Only those that are non-CONST
@@ -833,98 +539,15 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
 
     if (VN_IS(modp, Class)) {
         // CFuncs with isConstructor/isDestructor used instead
-    } else if (optSystemC() && modp->isTop()) {
-        ofp()->putsPrivate(false);  // public:
-        puts("SC_CTOR(" + prefixNameProtect(modp) + ");\n");
-        puts("virtual ~" + prefixNameProtect(modp) + "();\n");
-    } else if (optSystemC()) {
-        ofp()->putsPrivate(false);  // public:
-        puts(prefixNameProtect(modp) + "(const char* __VCname = \"\");\n");
-        puts("~" + prefixNameProtect(modp) + "();\n");
     } else {
         ofp()->putsPrivate(false);  // public:
-        if (modp->isTop()) {
-            puts("/// Construct the model; called by application code\n");
-            puts("/// If contextp is null, then the model will use the default global context\n");
-            puts("/// If name is \"\", then makes a wrapper with a\n");
-            puts("/// single model invisible with respect to DPI scope names.\n");
-            puts(prefixNameProtect(modp) + "(VerilatedContext* contextp,"
-                 + " const char* name = \"TOP\");\n");
-            puts(prefixNameProtect(modp) + "(const char* name = \"TOP\")\n");
-            puts("    : " + prefixNameProtect(modp) + "(nullptr, name) {}\n");
-        } else {
-            if (VN_IS(modp, Class)) {
-                // TODO move all constructor definition to e.g. V3CUse
-                puts(prefixNameProtect(modp) + "();\n");
-            } else {
-                puts(prefixNameProtect(modp) + "(const char* name = \"TOP\");\n");
-            }
-        }
-        if (modp->isTop()) {
-            puts("/// Destroy the model; called (often implicitly) by application code\n");
-        }
+        puts(prefixNameProtect(modp) + "(const char* name);\n");
         puts("~" + prefixNameProtect(modp) + "();\n");
     }
 
-    if (v3Global.opt.trace() && modp->isTop()) {
-        puts("/// Trace signals in the model; called by application code\n");
-        puts("void trace(" + v3Global.opt.traceClassBase()
-             + "C* tfp, int levels, int options = 0);\n");
-        if (optSystemC()) {
-            puts("/// SC tracing; avoid overloaded virtual function lint warning\n");
-            puts("virtual void trace(sc_trace_file* tfp) const override { "
-                 "::sc_core::sc_module::trace(tfp); }\n");
-        }
-    }
-
     emitTextSection(AstType::atScInt);
 
-    if (modp->isTop()) {
-        puts("\n// API METHODS\n");
-        puts("/// Return current simulation context for this model.\n");
-        puts("/// Used to get to e.g. simulation time via contextp()->time()\n");
-        puts("VerilatedContext* contextp() const;\n");
-
-        string callEvalEndStep
-            = (v3Global.needTraceDumper() && !optSystemC()) ? "eval_end_step(); " : "";
-        if (optSystemC()) {
-            ofp()->putsPrivate(true);  ///< eval() is invoked by our sensitive() calls.
-        }
-        if (!optSystemC()) {
-            puts("/// Evaluate the model.  Application must call when inputs change.\n");
-        }
-        puts("void eval() { eval_step(); " + callEvalEndStep + "}\n");
-        if (!optSystemC()) {
-            puts("/// Evaluate when calling multiple units/models per time step.\n");
-        }
-        puts("void eval_step();\n");
-        if (!optSystemC()) {
-            puts("/// Evaluate at end of a timestep for tracing, when using eval_step().\n");
-            puts("/// Application must call after all eval() and before time changes.\n");
-            puts("void eval_end_step()");
-            if (callEvalEndStep == "") {
-                puts(" {}\n");
-            } else {
-                puts(";\n");
-            }
-        }
-        ofp()->putsPrivate(false);  // public:
-        if (!optSystemC()) {
-            puts("/// Simulation complete, run final blocks.  Application "
-                 "must call on completion.\n");
-        }
-        puts("void final();\n");
-    }
-
     puts("\n// INTERNAL METHODS\n");
-    if (modp->isTop()) {
-        ofp()->putsPrivate(false);  // public: as accessed by loose functions
-        if (v3Global.needTraceDumper()) {
-            if (!optSystemC()) puts("void _traceDump();\n");
-            puts("void _traceDumpOpen();\n");
-            puts("void _traceDumpClose();\n");
-        }
-    }
 
     if (!VN_IS(modp, Class)) {
         ofp()->putsPrivate(false);  // public:
@@ -946,17 +569,6 @@ void EmitCImp::emitInt(AstNodeModule* modp) {
 
     puts("\n//----------\n\n");
     emitIntFuncDecls(modp, false);
-
-    // Save/restore
-    if (v3Global.opt.savable() && modp->isTop()) {
-        puts("\n");
-        puts("inline VerilatedSerialize& operator<<(VerilatedSerialize& os, "
-             + prefixNameProtect(modp) + "& rhs) {\n"  //
-             + "Verilated::quiesce(); rhs." + protect("__Vserialize") + "(os); return os; }\n");
-        puts("inline VerilatedDeserialize& operator>>(VerilatedDeserialize& os, "
-             + prefixNameProtect(modp) + "& rhs) {\n"  //
-             + "Verilated::quiesce(); rhs." + protect("__Vdeserialize") + "(os); return os; }\n");
-    }
 }
 
 //----------------------------------------------------------------------
@@ -989,13 +601,7 @@ void EmitCImp::emitImp(AstNodeModule* modp) {
         emitCoverageImp(modp);
     }
 
-    if (m_fast) {
-        emitTextSection(AstType::atScImp);
-        if (modp->isTop()) {
-            emitWrapFast();
-            emitWrapEval();
-        }
-    }
+    if (m_fast) { emitTextSection(AstType::atScImp); }
 
     // Blocks
     for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
@@ -1111,78 +717,6 @@ class EmitCTrace final : EmitCFunc {
         puts("\n");
     }
 
-    void emitTraceSlow() {
-        puts("\n//======================\n");
-
-        if (v3Global.needTraceDumper() && !optSystemC()) {
-            puts("\nvoid " + topClassName() + "::_traceDump() {\n");
-            // Caller checked for __Vm_dumperp non-nullptr
-            puts("const VerilatedLockGuard lock(vlSymsp->__Vm_dumperMutex);\n");
-            puts("vlSymsp->__Vm_dumperp->dump(VL_TIME_Q());\n");
-            puts("}\n");
-            splitSizeInc(10);
-        }
-
-        if (v3Global.needTraceDumper()) {
-            puts("\nvoid " + topClassName() + "::_traceDumpOpen() {\n");
-            puts("const VerilatedLockGuard lock(vlSymsp->__Vm_dumperMutex);\n");
-            puts("if (VL_UNLIKELY(!vlSymsp->__Vm_dumperp)) {\n");
-            puts("vlSymsp->__Vm_dumperp = new " + v3Global.opt.traceClassLang() + "();\n");
-            puts("trace(vlSymsp->__Vm_dumperp, 0, 0);\n");
-            puts("std::string dumpfile = vlSymsp->_vm_contextp__->dumpfileCheck();\n");
-            puts("vlSymsp->__Vm_dumperp->open(dumpfile.c_str());\n");
-            puts("vlSymsp->__Vm_dumping = true;\n");
-            puts("}\n");
-            puts("}\n");
-            splitSizeInc(10);
-
-            puts("\nvoid " + topClassName() + "::_traceDumpClose() {\n");
-            puts("const VerilatedLockGuard lock(vlSymsp->__Vm_dumperMutex);\n");
-            puts("vlSymsp->__Vm_dumping = false;\n");
-            puts("VL_DO_CLEAR(delete vlSymsp->__Vm_dumperp, vlSymsp->__Vm_dumperp = "
-                 "nullptr);\n");
-            puts("}\n");
-            splitSizeInc(10);
-        }
-
-        puts("\n");
-        m_lazyDecls.emit("void " + topClassName() + "__", protect("traceInitTop"),
-                         "(" + topClassName() + "* vlSelf, " + v3Global.opt.traceClassBase()
-                             + "* tracep);");
-
-        puts("\nstatic void " + protect("traceInit") + "(void* voidSelf, "
-             + v3Global.opt.traceClassBase() + "* tracep, uint32_t code) {\n");
-        putsDecoration("// Callback from tracep->open()\n");
-        puts(topClassName() + "*const __restrict vlSelf = static_cast<" + topClassName()
-             + "*>(voidSelf);\n");
-        puts("if (!vlSelf->vlSymsp->_vm_contextp__->calcUnusedSigs()) {\n");
-        puts("VL_FATAL_MT(__FILE__, __LINE__, __FILE__,\n");
-        puts("            \"Turning on wave traces requires Verilated::traceEverOn(true) call "
-             "before time 0.\");\n");
-        puts("}\n");
-        puts("vlSelf->vlSymsp->__Vm_baseCode = code;\n");
-        puts("tracep->module(vlSelf->vlSymsp->name());\n");
-        puts("tracep->scopeEscape(' ');\n");
-        puts(topClassName() + "__" + protect("traceInitTop") + "(vlSelf, tracep);\n");
-        puts("tracep->scopeEscape('.');\n");  // Restore so later traced files won't break
-        puts("}\n");
-        splitSizeInc(10);
-
-        puts("\n");
-        m_lazyDecls.emit("void " + topClassName() + "__", protect("traceRegister"),
-                         "(" + topClassName() + "* vlSelf, " + v3Global.opt.traceClassBase()
-                             + "* tracep);");
-
-        puts("\nvoid " + topClassName() + "::trace(");
-        puts(v3Global.opt.traceClassBase() + "C* tfp, int, int) {\n");
-        puts("tfp->spTrace()->addInitCb(&" + protect("traceInit") + ", this);\n");
-        puts(topClassName() + "__" + protect("traceRegister") + "(this, tfp->spTrace());\n");
-        puts("}\n");
-        splitSizeInc(10);
-
-        puts("\n//======================\n\n");
-    }
-
     bool emitTraceIsScBv(AstTraceInc* nodep) {
         const AstVarRef* varrefp = VN_CAST(nodep->declp()->valuep(), VarRef);
         if (!varrefp) return false;
@@ -1528,8 +1062,6 @@ public:
         // Put out the file
         newOutCFile(0);
 
-        if (m_slow) emitTraceSlow();
-
         iterate(v3Global.rootp());
 
         VL_DO_CLEAR(delete m_ofp, m_ofp = nullptr);
diff --git a/src/V3EmitC.h b/src/V3EmitC.h
index d5c053a9f..406a00429 100644
--- a/src/V3EmitC.h
+++ b/src/V3EmitC.h
@@ -30,6 +30,7 @@ public:
     static void emitc();
     static void emitcConstPool();
     static void emitcInlines();
+    static void emitcModel();
     static void emitcSyms(bool dpiHdrOnly = false);
     static void emitcTrace();
     static void emitcFiles();
diff --git a/src/V3EmitCBase.cpp b/src/V3EmitCBase.cpp
index 48cee377f..f955f99dc 100644
--- a/src/V3EmitCBase.cpp
+++ b/src/V3EmitCBase.cpp
@@ -86,7 +86,13 @@ void EmitCBaseVisitor::emitCFuncHeader(const AstCFunc* funcp, const AstNodeModul
         puts(funcp->rtnTypeVoid());
         puts(" ");
     }
-    if (withScope && funcp->isProperMethod()) puts(prefixNameProtect(modp) + "::");
+    if (withScope) {
+        if (funcp->dpiExportDispatcher()) {
+            puts(topClassName() + "::");
+        } else if (funcp->isProperMethod()) {
+            puts(prefixNameProtect(modp) + "::");
+        }
+    }
     puts(funcNameProtect(funcp, modp));
     puts("(" + cFuncArgs(funcp) + ")");
     if (funcp->isConst().trueKnown() && funcp->isProperMethod()) puts(" const");
@@ -108,8 +114,9 @@ void EmitCBaseVisitor::emitCFuncDecl(const AstCFunc* funcp, const AstNodeModule*
     if (!funcp->ifdef().empty()) puts("#endif  // " + funcp->ifdef() + "\n");
 }
 
-void EmitCBaseVisitor::emitVarDecl(const AstVar* nodep, const string& prefixIfImp) {
+void EmitCBaseVisitor::emitVarDecl(const AstVar* nodep, const string& prefixIfImp, bool asRef) {
     const AstBasicDType* const basicp = nodep->basicp();
+    bool refNeedParens = VN_IS(nodep->dtypeSkipRefp(), UnpackArrayDType);
 
     const auto emitDeclArrayBrackets = [this](const AstVar* nodep) -> void {
         // This isn't very robust and may need cleanup for other data types
@@ -137,7 +144,12 @@ void EmitCBaseVisitor::emitVarDecl(const AstVar* nodep, const string& prefixIfIm
             puts(nodep->scType());
             puts("> ");
         }
+        if (asRef) {
+            if (refNeedParens) puts("(");
+            puts("&");
+        }
         puts(nodep->nameProtect());
+        if (asRef && refNeedParens) { puts(")"); }
         emitDeclArrayBrackets(nodep);
         puts(";\n");
     } else if (nodep->isIO() && basicp && !basicp->isOpaque()) {
@@ -159,9 +171,16 @@ void EmitCBaseVisitor::emitVarDecl(const AstVar* nodep, const string& prefixIfIm
             puts("16");
         } else if (nodep->isWide()) {
             puts("W");
+            refNeedParens = true;
         }
 
-        puts("(" + nodep->nameProtect());
+        puts("(");
+        if (asRef) {
+            if (refNeedParens) puts("(");
+            puts("&");
+        }
+        puts(nodep->nameProtect());
+        if (asRef && refNeedParens) { puts(")"); }
         emitDeclArrayBrackets(nodep);
         // If it's a packed struct/array then nodep->width is the whole
         // thing, msb/lsb is just lowest dimension
@@ -180,7 +199,7 @@ void EmitCBaseVisitor::emitVarDecl(const AstVar* nodep, const string& prefixIfIm
                                   && name.substr(name.size() - suffix.size()) == suffix;
             if (beStatic) puts("static VL_THREAD_LOCAL ");
         }
-        puts(nodep->vlArgType(true, false, false, prefixIfImp));
+        puts(nodep->vlArgType(true, false, false, prefixIfImp, asRef));
         puts(";\n");
     }
 }
diff --git a/src/V3EmitCBase.h b/src/V3EmitCBase.h
index 81af458fe..b9362991c 100644
--- a/src/V3EmitCBase.h
+++ b/src/V3EmitCBase.h
@@ -53,9 +53,10 @@ public:
         return VIdProtect::protectWordsIf(name, doIt);
     }
     static string ifNoProtect(const string& in) { return v3Global.opt.protectIds() ? "" : in; }
-    static string voidSelfAssign() {
-        return topClassName() + "* const __restrict vlSelf VL_ATTR_UNUSED = static_cast<"
-               + topClassName() + "*>(voidSelf);\n";
+    static string voidSelfAssign(const AstNodeModule* modp) {
+        const string className = prefixNameProtect(modp);
+        return className + "* const __restrict vlSelf VL_ATTR_UNUSED = static_cast<" + className
+               + "*>(voidSelf);\n";
     }
     static string symClassName() { return v3Global.opt.prefix() + "_" + protect("_Syms"); }
     static string symClassVar() { return symClassName() + "* __restrict vlSymsp"; }
@@ -64,12 +65,7 @@ public:
     }
     static string funcNameProtect(const AstCFunc* nodep, const AstNodeModule* modp = nullptr);
     static string prefixNameProtect(const AstNode* nodep) {  // C++ name with prefix
-        const AstNodeModule* modp = VN_CAST_CONST(nodep, NodeModule);
-        if (modp && modp->isTop()) {
-            return topClassName();
-        } else {
-            return v3Global.opt.modPrefix() + "_" + protect(nodep->name());
-        }
+        return v3Global.opt.modPrefix() + "_" + protect(nodep->name());
     }
     static string topClassName() {  // Return name of top wrapper module
         return v3Global.opt.prefix();
@@ -83,7 +79,7 @@ public:
     string cFuncArgs(const AstCFunc* nodep);
     void emitCFuncHeader(const AstCFunc* funcp, const AstNodeModule* modp, bool withScope);
     void emitCFuncDecl(const AstCFunc* funcp, const AstNodeModule* modp, bool cLinkage = false);
-    void emitVarDecl(const AstVar* nodep, const string& prefixIfImp);
+    void emitVarDecl(const AstVar* nodep, const string& prefixIfImp, bool asRef = false);
     void emitModCUse(AstNodeModule* modp, VUseType useType);
 
     // CONSTRUCTORS
diff --git a/src/V3EmitCFunc.cpp b/src/V3EmitCFunc.cpp
index f0c8e0ee5..5a5613981 100644
--- a/src/V3EmitCFunc.cpp
+++ b/src/V3EmitCFunc.cpp
@@ -701,31 +701,6 @@ void EmitCFunc::emitSortedVarList(const VarVec& anons, const VarVec& nonanons,
     }
 }
 
-void EmitCFunc::emitIntFuncDecls(AstNodeModule* modp, bool inClassBody) {
-    std::vector<const AstCFunc*> funcsp;
-
-    for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
-        if (const AstCFunc* funcp = VN_CAST(nodep, CFunc)) {
-            if (funcp->dpiImportPrototype())  // DPI import prototypes are declared in __Dpi.h
-                continue;
-            if (funcp->isMethod() != inClassBody)  // Only methods go inside class
-                continue;
-            if (funcp->isMethod() && funcp->isLoose())  // Loose methods are declared lazily
-                continue;
-            funcsp.push_back(funcp);
-        }
-    }
-
-    stable_sort(funcsp.begin(), funcsp.end(), [](const AstNode* ap, const AstNode* bp) {  //
-        return ap->name() < bp->name();
-    });
-
-    for (const AstCFunc* funcp : funcsp) {
-        if (inClassBody) ofp()->putsPrivate(funcp->declPrivate());
-        emitCFuncDecl(funcp, modp);
-    }
-}
-
 void EmitCFunc::emitCCallArgs(AstNodeCCall* nodep) {
     bool comma = false;
     if (nodep->funcp()->isLoose() && !nodep->funcp()->isStatic()) {
diff --git a/src/V3EmitCFunc.h b/src/V3EmitCFunc.h
index 42e8f7daf..bee0293a4 100644
--- a/src/V3EmitCFunc.h
+++ b/src/V3EmitCFunc.h
@@ -188,7 +188,6 @@ public:
     }
     void emitOpName(AstNode* nodep, const string& format, AstNode* lhsp, AstNode* rhsp,
                     AstNode* thsp);
-    void emitIntFuncDecls(AstNodeModule* modp, bool inClassBody);
     void emitCCallArgs(AstNodeCCall* nodep);
     void emitDereference(const string& pointer);
     void emitCvtPackStr(AstNode* nodep);
@@ -514,7 +513,7 @@ public:
         case VDumpCtlType::VARS:
             // We ignore number of levels to dump in exprp()
             if (v3Global.opt.trace()) {
-                puts("vlSymsp->TOPp->_traceDumpOpen();\n");
+                puts("vlSymsp->_traceDumpOpen();\n");
             } else {
                 puts("VL_PRINTF_MT(\"-Info: ");
                 puts(protect(nodep->fileline()->filename()));
diff --git a/src/V3EmitCModel.cpp b/src/V3EmitCModel.cpp
new file mode 100644
index 000000000..cb1a0ba54
--- /dev/null
+++ b/src/V3EmitCModel.cpp
@@ -0,0 +1,633 @@
+// -*- mode: C++; c-file-style: "cc-mode" -*-
+//*************************************************************************
+// DESCRIPTION: Verilator: Emit C++ for model entry point class
+//
+// Code available from: https://verilator.org
+//
+//*************************************************************************
+//
+// Copyright 2003-2021 by Wilson Snyder. This program is free software; you
+// can redistribute it and/or modify it under the terms of either the GNU
+// Lesser General Public License Version 3 or the Perl Artistic License
+// Version 2.0.
+// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+//
+//*************************************************************************
+
+#include "config_build.h"
+#include "verilatedos.h"
+
+#include "V3Global.h"
+#include "V3EmitC.h"
+#include "V3EmitCFunc.h"
+
+#include <algorithm>
+#include <vector>
+
+class EmitCModel final : public EmitCFunc {
+
+    // METHODS
+    VL_DEBUG_FUNC;
+
+    void putSectionDelimiter(const string& name) {
+        puts("\n");
+        puts("//============================================================\n");
+        puts("// " + name + "\n");
+    }
+
+    void emitHeader(AstNodeModule* modp) {
+        UASSERT(!m_ofp, "Output file should not be open");
+
+        const string filename = v3Global.opt.makeDir() + "/" + topClassName() + ".h";
+        newCFile(filename, /* slow: */ false, /* source: */ false);
+        m_ofp = v3Global.opt.systemC() ? new V3OutScFile(filename) : new V3OutCFile(filename);
+
+        ofp()->putsHeader();
+        puts("// DESCRIPTION: Verilator output: Primary model header\n");
+        puts("//\n");
+        puts("// This header should be included by all source files instantiating the design.\n");
+        puts("// The class here is then constructed to instantiate the design.\n");
+        puts("// See the Verilator manual for examples.\n");
+
+        ofp()->putsGuard();
+
+        // Include files
+        puts("\n");
+        ofp()->putsIntTopInclude();
+        if (v3Global.needHeavy()) {
+            puts("#include \"verilated_heavy.h\"\n");
+        } else {
+            puts("#include \"verilated.h\"\n");
+        }
+        if (v3Global.opt.mtasks()) puts("#include \"verilated_threads.h\"\n");
+        if (v3Global.opt.savable()) puts("#include \"verilated_save.h\"\n");
+        if (v3Global.opt.coverage()) puts("#include \"verilated_cov.h\"\n");
+        if (v3Global.dpi()) puts("#include \"svdpi.h\"\n");
+
+        // Declare foreign instances up front to make C++ happy
+        puts("\n");
+        puts("class " + symClassName() + ";\n");
+        puts("class " + prefixNameProtect(modp) + ";\n");  // For rootp pointer only
+        if (v3Global.opt.trace()) puts("class " + v3Global.opt.traceClassLang() + ";\n");
+        emitModCUse(modp, VUseType::INT_FWD_CLASS);  // Note: This is needed for cell forwarding
+
+        puts("\n");
+
+        puts("// This class is the main interface to the Verilated model\n");
+        if (optSystemC()) {
+            puts("SC_MODULE(" + topClassName() + ") {\n");
+        } else {
+            puts("class " + topClassName() + " VL_NOT_FINAL {\n");
+        }
+        ofp()->resetPrivate();
+        ofp()->putsPrivate(true);  // private:
+
+        puts("// Symbol table holding complete model state (owned by this class)\n");
+        puts(symClassName() + "* const vlSymsp;\n");
+
+        puts("\n");
+        ofp()->putsPrivate(false);  // public:
+        // User accessible IO
+        puts("\n// PORTS\n"
+             "// The application code writes and reads these signals to\n"
+             "// propagate new values into/out from the Verilated model.\n");
+        for (const AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
+            if (const AstVar* const varp = VN_CAST_CONST(nodep, Var)) {
+                if (varp->isPrimaryIO()) {  //
+                    emitVarDecl(varp, "", /* asRef: */ true);
+                }
+            }
+        }
+
+        // Cells instantiated by the top level (for access to /* verilator public */)
+        puts("\n// CELLS\n"
+             "// Public to allow access to /* verilator public */ items.\n"
+             "// Otherwise the application code can consider these internals.\n");
+        for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
+            if (const AstCell* const cellp = VN_CAST_CONST(nodep, Cell)) {
+                puts(prefixNameProtect(cellp->modp()) + "* const " + cellp->nameProtect() + ";\n");
+            }
+        }
+
+        // root instance pointer (for access to internals, including public_flat items).
+        puts("\n// Root instance pointer to allow access to model internals,\n"
+             "// including inlined /* verilator public_flat_* */ items.\n");
+        puts(prefixNameProtect(modp) + "* const rootp;\n");
+
+        puts("\n");
+        ofp()->putsPrivate(false);  // public:
+        puts("// CONSTRUCTORS\n");
+        if (optSystemC()) {
+            puts("SC_CTOR(" + topClassName() + ");\n");
+            puts("virtual ~" + topClassName() + "();\n");
+        } else {
+            puts("/// Construct the model; called by application code\n");
+            puts("/// If contextp is null, then the model will use the default global "
+                 "context\n");
+            puts("/// If name is \"\", then makes a wrapper with a\n");
+            puts("/// single model invisible with respect to DPI scope names.\n");
+            puts("explicit " + topClassName() + "(VerilatedContext* contextp,"
+                 + " const char* name = \"TOP\");\n");
+            puts("explicit " + topClassName() + "(const char* name = \"TOP\");\n");
+            puts("/// Destroy the model; called (often implicitly) by application code\n");
+            puts("virtual ~" + topClassName() + "();\n");
+        }
+        ofp()->putsPrivate(true);
+        puts("VL_UNCOPYABLE(" + topClassName() + ");  ///< Copying not allowed\n");
+
+        puts("\n");
+        ofp()->putsPrivate(false);  // public:
+        puts("// API METHODS\n");
+        string callEvalEndStep
+            = (v3Global.needTraceDumper() && !optSystemC()) ? "eval_end_step(); " : "";
+        if (optSystemC()) {
+            ofp()->putsPrivate(true);  ///< eval() is invoked by our sensitive() calls.
+        }
+        if (!optSystemC()) {
+            puts("/// Evaluate the model.  Application must call when inputs change.\n");
+        }
+        puts("void eval() { eval_step(); " + callEvalEndStep + "}\n");
+        if (!optSystemC()) {
+            puts("/// Evaluate when calling multiple units/models per time step.\n");
+        }
+        puts("void eval_step();\n");
+        if (!optSystemC()) {
+            puts("/// Evaluate at end of a timestep for tracing, when using eval_step().\n");
+            puts("/// Application must call after all eval() and before time changes.\n");
+            puts("void eval_end_step()");
+            if (callEvalEndStep == "") {
+                puts(" {}\n");
+            } else {
+                puts(";\n");
+            }
+        }
+        if (!optSystemC()) {
+            puts("/// Simulation complete, run final blocks.  Application "
+                 "must call on completion.\n");
+        }
+        ofp()->putsPrivate(false);  // public:
+        puts("void final();\n");
+
+        if (v3Global.opt.trace()) {
+            puts("/// Trace signals in the model; called by application code\n");
+            puts("void trace(" + v3Global.opt.traceClassBase()
+                 + "C* tfp, int levels, int options = 0);\n");
+            if (optSystemC()) {
+                puts("/// SC tracing; avoid overloaded virtual function lint warning\n");
+                puts("virtual void trace(sc_trace_file* tfp) const override { "
+                     "::sc_core::sc_module::trace(tfp); }\n");
+            }
+        }
+
+        puts("/// Return current simulation context for this model.\n");
+        puts("/// Used to get to e.g. simulation time via contextp()->time()\n");
+        puts("VerilatedContext* contextp() const;\n");
+        if (!optSystemC()) {
+            puts("/// Retrieve name of this model instance (as passed to constructor).\n");
+            puts("const char* name() const;\n");
+        }
+
+        // Emit DPI export dispatcher declarations
+        {
+            std::vector<const AstCFunc*> funcps;
+
+            for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
+                if (const AstCFunc* funcp = VN_CAST(nodep, CFunc)) {
+                    if (!funcp->dpiExportDispatcher()) continue;
+                    funcps.push_back(funcp);
+                }
+            }
+
+            stable_sort(funcps.begin(), funcps.end(), [](const AstNode* ap, const AstNode* bp) {
+                return ap->name() < bp->name();
+            });
+
+            if (!funcps.empty()) {
+                puts("\n/// DPI Export functions\n");
+                for (const AstCFunc* funcp : funcps) { emitCFuncDecl(funcp, modp); }
+            }
+        }
+
+        if (v3Global.opt.savable()) {
+            puts("\n");
+            puts("// Serialization functions\n");
+            puts("friend VerilatedSerialize& operator<<(VerilatedSerialize& os, "  //
+                 + topClassName() + "& rhs);\n");
+            puts("friend VerilatedDeserialize& operator>>(VerilatedDeserialize& os, "
+                 + topClassName() + "& rhs);\n");
+        }
+
+        puts("} VL_ATTR_ALIGNED(VL_CACHE_LINE_BYTES);\n");
+
+        ofp()->putsEndGuard();
+
+        VL_DO_CLEAR(delete m_ofp, m_ofp = nullptr);
+    }
+
+    void emitConstructorImplementation(AstNodeModule* modp) {
+        putSectionDelimiter("Constructors");
+
+        puts("\n");
+        puts(topClassName() + "::" + topClassName());
+        if (optSystemC()) {
+            puts("(sc_module_name /* unused */)\n");
+            puts("    : vlSymsp{new " + symClassName() + "(nullptr, name(), this)}\n");
+        } else {
+            puts(+"(VerilatedContext* _vcontextp__, const char* _vcname__)\n");
+            puts("    : vlSymsp{new " + symClassName() + "(_vcontextp__, _vcname__, this)}\n");
+        }
+
+        // Set up IO references
+        for (const AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
+            if (const AstVar* const varp = VN_CAST_CONST(nodep, Var)) {
+                if (varp->isPrimaryIO()) {
+                    const string protName = varp->nameProtect();
+                    puts("    , " + protName + "{vlSymsp->TOP." + protName + "}\n");
+                }
+            }
+        }
+
+        // Setup cell pointers
+        for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
+            if (const AstCell* const cellp = VN_CAST_CONST(nodep, Cell)) {
+                const string protName = cellp->nameProtect();
+                puts("    , " + protName + "{vlSymsp->TOP." + protName + "}\n");
+            }
+        }
+
+        // Setup rootp root instance pointer,
+        puts("    , rootp{&(vlSymsp->TOP)}\n");
+
+        puts("{\n");
+
+        if (optSystemC()) {
+            // Create sensitivity list for when to evaluate the model.
+            putsDecoration("// Sensitivities on all clocks and combinational inputs\n");
+            puts("SC_METHOD(eval);\n");
+            for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
+                if (const AstVar* const varp = VN_CAST(nodep, Var)) {
+                    if (varp->isNonOutput() && (varp->isScSensitive() || varp->isUsedClock())) {
+                        int vects = 0;
+                        // This isn't very robust and may need cleanup for other data types
+                        for (AstUnpackArrayDType* arrayp
+                             = VN_CAST(varp->dtypeSkipRefp(), UnpackArrayDType);
+                             arrayp;
+                             arrayp = VN_CAST(arrayp->subDTypep()->skipRefp(), UnpackArrayDType)) {
+                            const int vecnum = vects++;
+                            UASSERT_OBJ(arrayp->hi() >= arrayp->lo(), varp,
+                                        "Should have swapped msb & lsb earlier.");
+                            const string ivar = string("__Vi") + cvtToStr(vecnum);
+                            puts("for (int __Vi" + cvtToStr(vecnum) + "="
+                                 + cvtToStr(arrayp->lo()));
+                            puts("; " + ivar + "<=" + cvtToStr(arrayp->hi()));
+                            puts("; ++" + ivar + ") {\n");
+                        }
+                        puts("sensitive << " + varp->nameProtect());
+                        for (int v = 0; v < vects; ++v) puts("[__Vi" + cvtToStr(v) + "]");
+                        puts(";\n");
+                        for (int v = 0; v < vects; ++v) puts("}\n");
+                    }
+                }
+            }
+            puts("\n");
+        }
+
+        puts("}\n");
+
+        if (!optSystemC()) {
+            puts("\n");
+            puts(topClassName() + "::" + topClassName() + "(const char* _vcname__)\n");
+            puts("    : " + topClassName() + "(nullptr, _vcname__)\n{\n}\n");
+        }
+    }
+
+    void emitDestructorImplementation() {
+        putSectionDelimiter("Destructor");
+
+        puts("\n");
+        puts(topClassName() + "::~" + topClassName() + "() {\n");
+        puts("delete vlSymsp;\n");
+        puts("}\n");
+    }
+
+    void emitSettleLoop(AstNodeModule* modp, bool initial) {
+        const string topModNameProtected = prefixNameProtect(modp);
+
+        putsDecoration("// Evaluate till stable\n");
+        puts("int __VclockLoop = 0;\n");
+        puts("QData __Vchange = 1;\n");
+        if (v3Global.opt.trace()) puts("vlSymsp->__Vm_activity = true;\n");
+        puts("do {\n");
+        puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+ ");
+        puts(initial ? "Initial" : "Clock");
+        puts(" loop\\n\"););\n");
+        if (initial)
+            puts(topModNameProtected + "__" + protect("_eval_settle") + "(&(vlSymsp->TOP));\n");
+        puts(topModNameProtected + "__" + protect("_eval") + "(&(vlSymsp->TOP));\n");
+        puts("if (VL_UNLIKELY(++__VclockLoop > " + cvtToStr(v3Global.opt.convergeLimit())
+             + ")) {\n");
+        puts("// About to fail, so enable debug to see what's not settling.\n");
+        puts("// Note you must run make with OPT=-DVL_DEBUG for debug prints.\n");
+        puts("int __Vsaved_debug = Verilated::debug();\n");
+        puts("Verilated::debug(1);\n");
+        puts("__Vchange = " + topModNameProtected + "__" + protect("_change_request")
+             + "(&(vlSymsp->TOP));\n");
+        puts("Verilated::debug(__Vsaved_debug);\n");
+        puts("VL_FATAL_MT(");
+        putsQuoted(protect(modp->fileline()->filename()));
+        puts(", ");
+        puts(cvtToStr(modp->fileline()->lineno()));
+        puts(", \"\",\n");
+        puts("\"Verilated model didn't ");
+        if (initial) puts("DC ");
+        puts("converge\\n\"\n");
+        puts("\"- See https://verilator.org/warn/DIDNOTCONVERGE\");\n");
+        puts("} else {\n");
+        puts("__Vchange = " + topModNameProtected + "__" + protect("_change_request")
+             + "(&(vlSymsp->TOP));\n");
+        puts("}\n");
+        puts("} while (VL_UNLIKELY(__Vchange));\n");
+    }
+
+    void emitStandardMethods(AstNodeModule* modp) {
+        UASSERT_OBJ(modp->isTop(), modp, "Attempting to emitWrapEval for non-top class");
+
+        const string topModNameProtected = prefixNameProtect(modp);
+        const string selfDecl = "(" + topModNameProtected + "* vlSelf)";
+
+        putSectionDelimiter("Evaluation loop");
+
+        // Forward declarations
+        puts("\n");
+        puts("void " + topModNameProtected + "__" + protect("_eval_initial") + selfDecl + ";\n");
+        puts("void " + topModNameProtected + "__" + protect("_eval_settle") + selfDecl + ";\n");
+        puts("void " + topModNameProtected + "__" + protect("_eval") + selfDecl + ";\n");
+        puts("QData " + topModNameProtected + "__" + protect("_change_request") + selfDecl
+             + ";\n");
+        puts("#ifdef VL_DEBUG\n");
+        puts("void " + topModNameProtected + "__" + protect("_eval_debug_assertions") + selfDecl
+             + ";\n");
+        puts("#endif  // VL_DEBUG\n");
+        puts("void " + topModNameProtected + "__" + protect("_final") + selfDecl + ";\n");
+
+        // _eval_initial_loop
+        puts("\nstatic void " + protect("_eval_initial_loop") + "(" + symClassVar() + ")"
+             + " {\n");
+        puts("vlSymsp->__Vm_didInit = true;\n");
+        puts(topModNameProtected + "__" + protect("_eval_initial") + "(&(vlSymsp->TOP));\n");
+        emitSettleLoop(modp, /* initial: */ true);
+        ensureNewLine();
+        puts("}\n");
+
+        // ::eval_step
+        puts("\nvoid " + topClassName() + "::eval_step() {\n");
+        puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+++++TOP Evaluate " + topClassName()
+             + "::eval_step\\n\"); );\n");
+        puts("#ifdef VL_DEBUG\n");
+        putsDecoration("// Debug assertions\n");
+        puts(topModNameProtected + "__" + protect("_eval_debug_assertions")
+             + "(&(vlSymsp->TOP));\n");
+        puts("#endif  // VL_DEBUG\n");
+        putsDecoration("// Initialize\n");
+        puts("if (VL_UNLIKELY(!vlSymsp->__Vm_didInit)) " + protect("_eval_initial_loop")
+             + "(vlSymsp);\n");
+
+        if (v3Global.opt.threads() == 1) {
+            uint32_t mtaskId = 0;
+            putsDecoration("// MTask " + cvtToStr(mtaskId) + " start\n");
+            puts("VL_DEBUG_IF(VL_DBG_MSGF(\"MTask" + cvtToStr(mtaskId) + " starting\\n\"););\n");
+            puts("Verilated::mtaskId(" + cvtToStr(mtaskId) + ");\n");
+        }
+
+        if (v3Global.opt.mtasks() && v3Global.opt.profThreads()) {
+            puts("if (VL_UNLIKELY((vlSymsp->_vm_contextp__->profThreadsStart() != "
+                 "vlSymsp->__Vm_profile_time_finished)\n");
+            puts(" && (VL_TIME_Q() > vlSymsp->_vm_contextp__->profThreadsStart())\n");
+            puts(" && (vlSymsp->_vm_contextp__->profThreadsWindow() >= 1))) {\n");
+            // Within a profile (either starting, middle, or end)
+            puts("if (vlSymsp->__Vm_profile_window_ct == 0) {\n");  // Opening file?
+            // Start profile on this cycle. We'll capture a window worth, then
+            // only analyze the next window worth. The idea is that the first window
+            // capture will hit some cache-cold stuff (eg printf) but it'll be warm
+            // by the time we hit the second window, we hope.
+            puts("vlSymsp->__Vm_profile_cycle_start = VL_RDTSC_Q();\n");
+            // "* 2" as first half is warmup, second half is collection
+            puts("vlSymsp->__Vm_profile_window_ct = vlSymsp->_vm_contextp__->profThreadsWindow() "
+                 "* 2 "
+                 "+ "
+                 "1;\n");
+            puts("}\n");
+            puts("--(vlSymsp->__Vm_profile_window_ct);\n");
+            puts("if (vlSymsp->__Vm_profile_window_ct == "
+                 "vlSymsp->_vm_contextp__->profThreadsWindow()) {\n");
+            // This barrier record in every threads' profile demarcates the
+            // cache-warm-up cycles before the barrier from the actual profile
+            // cycles afterward.
+            puts("vlSymsp->__Vm_threadPoolp->profileAppendAll(");
+            puts("VlProfileRec(VlProfileRec::Barrier()));\n");
+            puts("vlSymsp->__Vm_profile_cycle_start = VL_RDTSC_Q();\n");
+            puts("}\n");
+            puts("else if (vlSymsp->__Vm_profile_window_ct == 0) {\n");
+            // Ending file.
+            puts("vluint64_t elapsed = VL_RDTSC_Q() - vlSymsp->__Vm_profile_cycle_start;\n");
+            puts("vlSymsp->__Vm_threadPoolp->profileDump(vlSymsp->_vm_contextp__->"
+                 "profThreadsFilename().c_str(), elapsed);\n");
+            // This turns off the test to enter the profiling code, but still
+            // allows the user to collect another profile by changing
+            // profThreadsStart
+            puts("vlSymsp->__Vm_profile_time_finished = "
+                 "vlSymsp->_vm_contextp__->profThreadsStart();\n");
+            puts("vlSymsp->__Vm_profile_cycle_start = 0;\n");
+            puts("}\n");
+            puts("}\n");
+        }
+
+        emitSettleLoop(modp, /* initial: */ false);
+        if (v3Global.opt.threads() == 1) {
+            puts("Verilated::endOfThreadMTask(vlSymsp->__Vm_evalMsgQp);\n");
+        }
+        if (v3Global.opt.threads()) puts("Verilated::endOfEval(vlSymsp->__Vm_evalMsgQp);\n");
+        puts("}\n");
+
+        // ::eval_end_step
+        if (v3Global.needTraceDumper() && !optSystemC()) {
+            puts("\nvoid " + topClassName() + "::eval_end_step() {\n");
+            puts("VL_DEBUG_IF(VL_DBG_MSGF(\"+eval_end_step " + topClassName()
+                 + "::eval_end_step\\n\"); );\n");
+            puts("#ifdef VM_TRACE\n");
+            putsDecoration("// Tracing\n");
+            // SystemC's eval loop deals with calling trace, not us
+            puts("if (VL_UNLIKELY(vlSymsp->__Vm_dumping)) vlSymsp->_traceDump();\n");
+            puts("#endif  // VM_TRACE\n");
+            puts("}\n");
+        }
+
+        putSectionDelimiter("Invoke final blocks");
+        // ::final
+        puts("\nvoid " + topClassName() + "::final() {\n");
+        puts(topModNameProtected + "__" + protect("_final") + "(&(vlSymsp->TOP));\n");
+        puts("}\n");
+
+        putSectionDelimiter("Utilities");
+        // ::contextp
+        puts("\nVerilatedContext* " + topClassName() + "::contextp() const {\n");
+        puts(/**/ "return vlSymsp->_vm_contextp__;\n");
+        puts("}\n");
+
+        if (!optSystemC()) {
+            // ::name
+            puts("\nconst char* " + topClassName() + "::name() const {\n");
+            puts(/**/ "return vlSymsp->name();\n");
+            puts("}\n");
+        }
+    }
+
+    void emitTraceMethods(AstNodeModule* modp) {
+        const string topModNameProtected = prefixNameProtect(modp);
+
+        putSectionDelimiter("Trace configuration");
+
+        // Forward declaration
+        puts("\nvoid " + topModNameProtected + "__" + protect("traceInitTop") + "("
+             + topModNameProtected + "* vlSelf, " + v3Global.opt.traceClassBase()
+             + "* tracep);\n");
+
+        // Static helper function
+        puts("\nstatic void " + protect("traceInit") + "(void* voidSelf, "
+             + v3Global.opt.traceClassBase() + "* tracep, uint32_t code) {\n");
+        putsDecoration("// Callback from tracep->open()\n");
+        puts(voidSelfAssign(modp));
+        puts(symClassAssign());
+        puts("if (!vlSymsp->_vm_contextp__->calcUnusedSigs()) {\n");
+        puts("VL_FATAL_MT(__FILE__, __LINE__, __FILE__,\n");
+        puts("\"Turning on wave traces requires Verilated::traceEverOn(true) call before time "
+             "0.\");\n");
+        puts("}\n");
+        puts("vlSymsp->__Vm_baseCode = code;\n");
+        puts("tracep->module(vlSymsp->name());\n");
+        puts("tracep->scopeEscape(' ');\n");
+        puts(topModNameProtected + "__" + protect("traceInitTop") + "(vlSelf, tracep);\n");
+        puts("tracep->scopeEscape('.');\n");  // Restore so later traced files won't break
+        puts("}\n");
+
+        // Forward declaration
+        puts("\nvoid " + topModNameProtected + "__" + protect("traceRegister") + "("
+             + topModNameProtected + "* vlSelf, " + v3Global.opt.traceClassBase()
+             + "* tracep);\n");
+
+        // ::trace
+        puts("\nvoid " + topClassName() + "::trace(");
+        puts(v3Global.opt.traceClassBase() + "C* tfp, int, int) {\n");
+        puts("tfp->spTrace()->addInitCb(&" + protect("traceInit") + ", &(vlSymsp->TOP));\n");
+        puts(topModNameProtected + "__" + protect("traceRegister")
+             + "(&(vlSymsp->TOP), tfp->spTrace());\n");
+        puts("}\n");
+    }
+
+    void emitSerializationFunctions() {
+        putSectionDelimiter("Model serialization");
+
+        puts("\nVerilatedSerialize& operator<<(VerilatedSerialize& os, " + topClassName()
+             + "& rhs) {\n");
+        puts("Verilated::quiesce();\n");
+        puts("rhs.vlSymsp->" + protect("__Vserialize") + "(os);\n");
+        puts("return os;\n");
+        puts("}\n");
+
+        puts("\nVerilatedDeserialize& operator>>(VerilatedDeserialize& os, " + topClassName()
+             + "& rhs) {\n");
+        puts("Verilated::quiesce();\n");
+        puts("rhs.vlSymsp->" + protect("__Vdeserialize") + "(os);\n");
+        puts("return os;\n");
+        puts("}\n");
+    }
+
+    void emitImplementation(AstNodeModule* modp) {
+        UASSERT(!m_ofp, "Output file should not be open");
+
+        const string filename = v3Global.opt.makeDir() + "/" + topClassName() + ".cpp";
+        newCFile(filename, /* slow: */ false, /* source: */ true);
+        m_ofp = v3Global.opt.systemC() ? new V3OutScFile(filename) : new V3OutCFile(filename);
+
+        ofp()->putsHeader();
+        puts("// DESCRIPTION: Verilator output: "
+             "Model implementation (design independent parts)\n");
+
+        puts("\n");
+        puts("#include \"" + topClassName() + ".h\"\n");
+        puts("#include \"" + symClassName() + ".h\"\n");
+        if (v3Global.opt.trace()) {
+            puts("#include \"" + v3Global.opt.traceSourceLang() + ".h\"\n");
+        }
+        if (v3Global.dpi()) {  //
+            puts("#include \"verilated_dpi.h\"\n");
+        }
+
+        emitConstructorImplementation(modp);
+        emitDestructorImplementation();
+        emitStandardMethods(modp);
+        if (v3Global.opt.trace()) { emitTraceMethods(modp); }
+        if (v3Global.opt.savable()) { emitSerializationFunctions(); }
+
+        VL_DO_CLEAR(delete m_ofp, m_ofp = nullptr);
+    }
+
+    void emitDpiExportDispatchers(AstNodeModule* modp) {
+        UASSERT(!m_ofp, "Output file should not be open");
+
+        // Emit DPI Export dispatchers
+        for (AstNode* nodep = modp->stmtsp(); nodep; nodep = nodep->nextp()) {
+            AstCFunc* const funcp = VN_CAST(nodep, CFunc);
+            if (!funcp || !funcp->dpiExportDispatcher()) continue;
+
+            if (splitNeeded()) {
+                // Splitting file, so using parallel build.
+                v3Global.useParallelBuild(true);
+                // Close old file
+                VL_DO_CLEAR(delete m_ofp, m_ofp = nullptr);
+            }
+
+            if (!m_ofp) {
+                const string filename = v3Global.opt.makeDir() + "/" + topClassName()
+                                        + "__Dpi_Export_" + cvtToStr(splitFilenumInc() - 1)
+                                        + ".cpp";
+                newCFile(filename, /* slow: */ false, /* source: */ true);
+                m_ofp = v3Global.opt.systemC() ? new V3OutScFile(filename)
+                                               : new V3OutCFile(filename);
+                m_lazyDecls.reset();
+                m_ofp->putsHeader();
+                puts(
+                    "// DESCRIPTION: Verilator output: Implementation of DPI export functions.\n");
+                puts("//\n");
+                puts("#include \"" + topClassName() + ".h\"\n");
+                puts("#include \"" + symClassName() + ".h\"\n");
+                puts("#include \"verilated_dpi.h\"\n");
+                puts("\n");
+            }
+
+            iterate(funcp);
+        }
+
+        if (m_ofp) { VL_DO_CLEAR(delete m_ofp, m_ofp = nullptr); }
+    }
+
+    void main(AstNodeModule* modp) {
+        m_modp = modp;
+        emitHeader(modp);
+        emitImplementation(modp);
+        if (v3Global.dpi()) { emitDpiExportDispatchers(modp); }
+    }
+
+    // VISITORS
+
+public:
+    explicit EmitCModel(AstNetlist* netlistp) { main(netlistp->topModulep()); }
+};
+
+//######################################################################
+// EmitC class functions
+
+void V3EmitC::emitcModel() {
+    UINFO(2, __FUNCTION__ << ": " << endl);
+    { EmitCModel emit(v3Global.rootp()); }
+}
diff --git a/src/V3EmitCSyms.cpp b/src/V3EmitCSyms.cpp
index 17307fa24..bcc22b94a 100644
--- a/src/V3EmitCSyms.cpp
+++ b/src/V3EmitCSyms.cpp
@@ -380,8 +380,7 @@ void EmitCSyms::emitSymHdr() {
     }
 
     ofp()->putsHeader();
-    puts("// DESCR"
-         "IPTION: Verilator output: Symbol table internal header\n");
+    puts("// DESCRIPTION: Verilator output: Symbol table internal header\n");
     puts("//\n");
     puts("// Internal details; most calling programs do not need this header,\n");
     puts("// unless using verilator public meta comments.\n");
@@ -395,6 +394,12 @@ void EmitCSyms::emitSymHdr() {
     } else {
         puts("#include \"verilated.h\"\n");
     }
+    if (v3Global.needTraceDumper()) {
+        puts("#include \"" + v3Global.opt.traceSourceLang() + ".h\"\n");
+    }
+
+    puts("\n// INCLUDE MODEL CLASS\n");
+    puts("\n#include \"" + topClassName() + ".h\"\n");
 
     puts("\n// INCLUDE MODULE CLASSES\n");
     for (AstNodeModule* nodep = v3Global.rootp()->modulesp(); nodep;
@@ -417,41 +422,52 @@ void EmitCSyms::emitSymHdr() {
         for (const auto& i : types) puts(i.first);
     }
 
-    puts("\n// SYMS CLASS\n");
-    puts(string("class ") + symClassName() + " : public VerilatedSyms {\n");
+    puts("\n// SYMS CLASS (contains all model state)\n");
+    puts("class " + symClassName() + " final : public VerilatedSyms {\n");
     ofp()->putsPrivate(false);  // public:
 
-    puts("\n// LOCAL STATE\n");
-    // Must be before subcells, as constructor order needed before _vlCoverInsert.
-    puts("const char* const __Vm_namep;\n");
+    puts("// INTERNAL STATE\n");
+    puts(topClassName() + "* const __Vm_modelp;\n");
 
     if (v3Global.needTraceDumper()) {
         // __Vm_dumperp is local, otherwise we wouldn't know what design's eval()
         // should call a global dumpperp
-        puts("bool __Vm_dumping;  // Dumping is active\n");
+        puts("bool __Vm_dumping = false;  // Dumping is active\n");
         puts("VerilatedMutex __Vm_dumperMutex;  // Protect __Vm_dumperp\n");
         puts(v3Global.opt.traceClassLang()
-             + "* __Vm_dumperp VL_GUARDED_BY(__Vm_dumperMutex);  /// Trace class for $dump*\n");
+             + "* __Vm_dumperp VL_GUARDED_BY(__Vm_dumperMutex) = nullptr;"
+               "  /// Trace class for $dump*\n");
     }
     if (v3Global.opt.trace()) {
-        puts("bool __Vm_activity;  ///< Used by trace routines to determine change occurred\n");
-        puts("uint32_t __Vm_baseCode;  "
-             "///< Used by trace routines when tracing multiple models\n");
+        puts("bool __Vm_activity = false;"
+             "  ///< Used by trace routines to determine change occurred\n");
+        puts("uint32_t __Vm_baseCode = 0;"
+             "  ///< Used by trace routines when tracing multiple models\n");
     }
-    puts("bool __Vm_didInit;\n");
+    puts("bool __Vm_didInit = false;\n");
 
-    puts("\n// SUBCELL STATE\n");
+    if (v3Global.opt.mtasks()) {
+        puts("VlThreadPool* const __Vm_threadPoolp;\n");
+        puts("bool __Vm_even_cycle = false;\n");
+
+        if (v3Global.opt.profThreads()) {
+            // rdtsc() at current cycle start
+            puts("vluint64_t __Vm_profile_cycle_start = 0;\n");
+            // Time we finished analysis
+            puts("vluint64_t __Vm_profile_time_finished = 0;\n");
+            // Track our position in the cache warmup and actual profile window
+            puts("vluint32_t __Vm_profile_window_ct = 0;\n");
+        }
+    }
+
+    puts("\n// MODULE INSTANCE STATE\n");
     for (const auto& i : m_scopes) {
         AstScope* scopep = i.first;
         AstNodeModule* modp = i.second;
         if (VN_IS(modp, Class)) continue;
-        if (modp->isTop()) {
-            ofp()->printf("%-30s ", (prefixNameProtect(modp) + "*").c_str());
-            puts(protectIf(scopep->nameDotless() + "p", scopep->protect()) + ";\n");
-        } else {
-            ofp()->printf("%-30s ", (prefixNameProtect(modp) + "").c_str());
-            puts(protectIf(scopep->nameDotless(), scopep->protect()) + ";\n");
-        }
+        const string name = prefixNameProtect(modp);
+        ofp()->printf("%-30s ", name.c_str());
+        puts(protectIf(scopep->nameDotless(), scopep->protect()) + ";\n");
     }
 
     if (m_coverBins) {
@@ -474,28 +490,30 @@ void EmitCSyms::emitSymHdr() {
         puts("VerilatedHierarchy __Vhier;\n");
     }
 
-    puts("\n// CREATORS\n");
-    puts(symClassName() + "(VerilatedContext* contextp, " + topClassName()
-         + "* topp, const char* namep);\n");
+    puts("\n// CONSTRUCTORS\n");
+    puts(symClassName() + "(VerilatedContext* contextp, const char* namep, " + topClassName()
+         + "* modelp);\n");
     puts(string("~") + symClassName() + "();\n");
 
     for (const auto& i : m_usesVfinal) {
         puts("void " + symClassName() + "_" + cvtToStr(i.first) + "(");
-        if (i.second) {
-            puts("int __Vfinal");
-        } else {
-            puts(topClassName() + "* topp");
-        }
+        if (i.second) { puts("int __Vfinal"); }
         puts(");\n");
     }
 
     puts("\n// METHODS\n");
-    puts("inline const char* name() { return __Vm_namep; }\n");
+    puts("const char* name() { return TOP.name(); }\n");
+
+    if (v3Global.needTraceDumper()) {
+        if (!optSystemC()) puts("void _traceDump();\n");
+        puts("void _traceDumpOpen();\n");
+        puts("void _traceDumpClose();\n");
+    }
+
     if (v3Global.opt.savable()) {
         puts("void " + protect("__Vserialize") + "(VerilatedSerialize& os);\n");
         puts("void " + protect("__Vdeserialize") + "(VerilatedDeserialize& os);\n");
     }
-    puts("\n");
     puts("} VL_ATTR_ALIGNED(VL_CACHE_LINE_BYTES);\n");
 
     ofp()->putsEndGuard();
@@ -533,20 +551,12 @@ void EmitCSyms::checkSplit(bool usesVfinal) {
     }
 
     m_ofpBase->puts(symClassName() + "_" + cvtToStr(m_funcNum) + "(");
-    if (usesVfinal) {
-        m_ofpBase->puts("__Vfinal");
-    } else {
-        m_ofpBase->puts("topp");
-    }
+    if (usesVfinal) { m_ofpBase->puts("__Vfinal"); }
     m_ofpBase->puts(");\n");
 
     emitSymImpPreamble();
     puts("void " + symClassName() + "::" + symClassName() + "_" + cvtToStr(m_funcNum) + "(");
-    if (usesVfinal) {
-        puts("int __Vfinal");
-    } else {
-        puts(topClassName() + "* topp");
-    }
+    if (usesVfinal) { puts("int __Vfinal"); }
     puts(") {\n");
 }
 
@@ -558,6 +568,7 @@ void EmitCSyms::emitSymImpPreamble() {
 
     // Includes
     puts("#include \"" + symClassName() + ".h\"\n");
+    puts("#include \"" + topClassName() + ".h\"\n");
     for (AstNodeModule* nodep = v3Global.rootp()->modulesp(); nodep;
          nodep = VN_CAST(nodep->nextp(), NodeModule)) {
         if (VN_IS(nodep, Class)) continue;  // Class included earlier
@@ -631,19 +642,14 @@ void EmitCSyms::emitSymImp() {
             // NOLINTNEXTLINE(performance-inefficient-string-concatenation)
             puts("void " + symClassName() + "::" + protect(funcname) + "(" + classname
                  + "& os) {\n");
-            puts("// LOCAL STATE\n");
-            // __Vm_namep presumably already correct
+            puts("// Internal state\n");
             if (v3Global.opt.trace()) puts("os" + op + "__Vm_activity;\n");
-            puts("os" + op + "__Vm_didInit;\n");
-            puts("// SUBCELL STATE\n");
-            for (std::vector<ScopeModPair>::iterator it = m_scopes.begin(); it != m_scopes.end();
-                 ++it) {
-                AstScope* scopep = it->first;
-                AstNodeModule* modp = it->second;
-                if (!modp->isTop()) {
-                    puts(protectIf(scopep->nameDotless(), scopep->protect()) + "."
-                         + protect(funcname) + "(os);\n");
-                }
+            puts("os " + op + " __Vm_didInit;\n");
+            puts("// Module instance state\n");
+            for (const auto& pair : m_scopes) {
+                const AstScope* const scopep = pair.first;
+                puts(protectIf(scopep->nameDotless(), scopep->protect()) + "." + protect(funcname)
+                     + "(os);\n");
             }
             puts("}\n");
         }
@@ -651,61 +657,70 @@ void EmitCSyms::emitSymImp() {
     }
 
     puts("// FUNCTIONS\n");
+    // Destructor
     puts(symClassName() + "::~" + symClassName() + "()\n");
     puts("{\n");
     emitScopeHier(true);
-    puts("}\n\n");
-    puts(symClassName() + "::" + symClassName() + "(VerilatedContext* contextp, " + topClassName()
-         + "* topp, const char* namep)\n");
-    puts("    // Setup locals\n");
-    puts("    : VerilatedSyms{contextp}\n");
-    puts("    , __Vm_namep(namep)\n");  // No leak, as gets destroyed when the top is destroyed
     if (v3Global.needTraceDumper()) {
-        puts("    , __Vm_dumping(false)\n");
-        puts("    , __Vm_dumperp(nullptr)\n");
+        puts("#ifdef VM_TRACE\n");
+        puts("if (__Vm_dumping) _traceDumpClose();\n");
+        puts("#endif  // VM_TRACE\n");
     }
-    if (v3Global.opt.trace()) {
-        puts("    , __Vm_activity(false)\n");
-        puts("    , __Vm_baseCode(0)\n");
+    if (v3Global.opt.mtasks()) { puts("delete __Vm_threadPoolp;\n"); }
+    puts("}\n\n");
+
+    // Constructor
+    puts(symClassName() + "::" + symClassName() + "(VerilatedContext* contextp, const char* namep,"
+         + topClassName() + "* modelp)\n");
+    puts("    : VerilatedSyms{contextp}\n");
+    puts("    // Setup internal state of the Syms class\n");
+    puts("    , __Vm_modelp(modelp)\n");
+
+    if (v3Global.opt.mtasks()) {
+        // TODO -- For now each model creates its own ThreadPool here,
+        // and deletes it in the destructor. If A and B are each top level
+        // modules, each creates a separate thread pool.  This allows
+        // A.eval() and B.eval() to run concurrently without any
+        // interference -- so long as the physical machine has enough cores
+        // to support both pools and all testbench threads.
+        //
+        // In the future, we might want to let the client provide a
+        // threadpool to the constructor. This would allow two or more
+        // models to share a single threadpool.
+        //
+        // For example: suppose models A and B are each compiled to run on
+        // 4 threads. The client might create a single thread pool with 3
+        // threads and pass it to both models. If the client can ensure that
+        // A.eval() and B.eval() do NOT run concurrently, there will be no
+        // contention for the threads. This mode is missing for now.  (Is
+        // there demand for such a setup?)
+        //
+        // Note we create N-1 threads in the thread pool. The thread
+        // that calls eval() becomes the final Nth thread for the
+        // duration of the eval call.
+        puts("    , __Vm_threadPoolp(new VlThreadPool(_vm_contextp__, "
+             + cvtToStr(v3Global.opt.threads() - 1) + ", " + cvtToStr(v3Global.opt.profThreads())
+             + "))\n");
     }
-    puts("    , __Vm_didInit(false)\n");
-    puts("    // Setup submodule names\n");
-    char comma = ',';
+
+    puts("    // Setup module instances\n");
     for (const auto& i : m_scopes) {
-        AstScope* scopep = i.first;
-        AstNodeModule* modp = i.second;
+        const AstScope* const scopep = i.first;
+        const AstNodeModule* const modp = i.second;
+        puts("    , ");
+        puts(protect(scopep->nameDotless()));
         if (modp->isTop()) {
+            puts("(namep)\n");
         } else {
-            puts(string("    ") + comma + " " + protect(scopep->nameDotless()));
-            puts("(Verilated::catName(topp->name(), ");
             // The "." is added by catName
+            puts("(Verilated::catName(namep, ");
             putsQuoted(protectWordsIf(scopep->prettyName(), scopep->protect()));
             puts("))\n");
-            comma = ',';
-            ++m_numStmts;
         }
+        ++m_numStmts;
     }
     puts("{\n");
 
-    puts("// Pointer to top level\n");
-    puts("TOPp = topp;\n");
-    puts("// Setup each module's pointers to their submodules\n");
-    for (const auto& i : m_scopes) {
-        AstScope* scopep = i.first;
-        AstNodeModule* modp = i.second;
-        if (!modp->isTop()) {
-            checkSplit(false);
-            string arrow = scopep->name();
-            string::size_type pos;
-            while ((pos = arrow.find('.')) != string::npos) arrow.replace(pos, 1, "->");
-            if (arrow.substr(0, 5) == "TOP->") arrow.replace(0, 5, "TOPp->");
-            ofp()->puts(protectWordsIf(arrow, scopep->protect()));
-            puts(" = &");
-            puts(protectIf(scopep->nameDotless(), scopep->protect()) + ";\n");
-            ++m_numStmts;
-        }
-    }
-
     puts("// Configure time unit / time precision\n");
     if (!v3Global.rootp()->timeunit().isNone()) {
         puts("_vm_contextp__->timeunit(");
@@ -718,20 +733,38 @@ void EmitCSyms::emitSymImp() {
         puts(");\n");
     }
 
+    puts("// Setup each module's pointers to their submodules\n");
+    for (const auto& i : m_scopes) {
+        const AstScope* const scopep = i.first;
+        const AstNodeModule* const modp = i.second;
+        if (const AstScope* const aboveScopep = scopep->aboveScopep()) {
+            checkSplit(false);
+            const string protName = protectWordsIf(scopep->name(), scopep->protect());
+            if (VN_IS(modp, ClassPackage)) {
+                // ClassPackage modules seem to be a bit out of place, so hard code...
+                puts("TOP");
+            } else {
+                puts(protectIf(aboveScopep->nameDotless(), aboveScopep->protect()));
+            }
+            puts(".");
+            puts(protName.substr(protName.rfind(".") + 1));
+            puts(" = &");
+            puts(protectIf(scopep->nameDotless(), scopep->protect()) + ";\n");
+            ++m_numStmts;
+        }
+    }
+
     puts("// Setup each module's pointer back to symbol table (for public functions)\n");
-    puts("TOPp->" + protect("__Vconfigure") + "(this, true);\n");
     for (const auto& i : m_scopes) {
         AstScope* scopep = i.first;
         AstNodeModule* modp = i.second;
-        if (!modp->isTop()) {
-            checkSplit(false);
-            // first is used by AstCoverDecl's call to __vlCoverInsert
-            const bool first = !modp->user1();
-            modp->user1(true);
-            puts(protectIf(scopep->nameDotless(), scopep->protect()) + "."
-                 + protect("__Vconfigure") + "(this, " + (first ? "true" : "false") + ");\n");
-            ++m_numStmts;
-        }
+        checkSplit(false);
+        // first is used by AstCoverDecl's call to __vlCoverInsert
+        const bool first = !modp->user1();
+        modp->user1(true);
+        puts(protectIf(scopep->nameDotless(), scopep->protect()) + "." + protect("__Vconfigure")
+             + "(this, " + (first ? "true" : "false") + ");\n");
+        ++m_numStmts;
     }
 
     if (!m_scopeNames.empty()) {  // Setup scope names
@@ -777,7 +810,6 @@ void EmitCSyms::emitSymImp() {
         // Someday.  For now public isn't common.
         for (auto it = m_scopeVars.begin(); it != m_scopeVars.end(); ++it) {
             checkSplit(true);
-            AstNodeModule* modp = it->second.m_modp;
             AstScope* scopep = it->second.m_scopep;
             AstVar* varp = it->second.m_varp;
             //
@@ -829,11 +861,7 @@ void EmitCSyms::emitSymImp() {
             putsQuoted(protect(it->second.m_varBasePretty));
 
             std::string varName;
-            if (modp->isTop()) {
-                varName += (protectIf(scopep->nameDotless() + "p", scopep->protect()) + "->");
-            } else {
-                varName += (protectIf(scopep->nameDotless(), scopep->protect()) + ".");
-            }
+            varName += (protectIf(scopep->nameDotless(), scopep->protect()) + ".");
 
             if (varp->isParam()) {
                 varName += protect("var_" + varp->name());
@@ -872,6 +900,34 @@ void EmitCSyms::emitSymImp() {
     }
 
     m_ofpBase->puts("}\n");
+
+    if (v3Global.needTraceDumper()) {
+        if (!optSystemC()) {
+            puts("\nvoid " + symClassName() + "::_traceDump() {\n");
+            // Caller checked for __Vm_dumperp non-nullptr
+            puts("const VerilatedLockGuard lock(__Vm_dumperMutex);\n");
+            puts("__Vm_dumperp->dump(VL_TIME_Q());\n");
+            puts("}\n");
+        }
+
+        puts("\nvoid " + symClassName() + "::_traceDumpOpen() {\n");
+        puts("const VerilatedLockGuard lock(__Vm_dumperMutex);\n");
+        puts("if (VL_UNLIKELY(!__Vm_dumperp)) {\n");
+        puts("__Vm_dumperp = new " + v3Global.opt.traceClassLang() + "();\n");
+        puts("__Vm_modelp->trace(__Vm_dumperp, 0, 0);\n");
+        puts("std::string dumpfile = _vm_contextp__->dumpfileCheck();\n");
+        puts("__Vm_dumperp->open(dumpfile.c_str());\n");
+        puts("__Vm_dumping = true;\n");
+        puts("}\n");
+        puts("}\n");
+
+        puts("\nvoid " + symClassName() + "::_traceDumpClose() {\n");
+        puts("const VerilatedLockGuard lock(__Vm_dumperMutex);\n");
+        puts("__Vm_dumping = false;\n");
+        puts("VL_DO_CLEAR(delete __Vm_dumperp, __Vm_dumperp = nullptr);\n");
+        puts("}\n");
+    }
+
     closeSplit();
     VL_DO_CLEAR(delete m_ofp, m_ofp = nullptr);
 }
diff --git a/src/V3EmitXml.cpp b/src/V3EmitXml.cpp
index e231a3d43..1e38e5552 100644
--- a/src/V3EmitXml.cpp
+++ b/src/V3EmitXml.cpp
@@ -324,10 +324,11 @@ private:
             && nodep->level() <= 2) {  // ==2 because we don't add wrapper when in XML mode
             m_os << "<cells>\n";
             m_os << "<cell " << nodep->fileline()->xml() << " "
-                 << nodep->fileline()->xmlDetailedLocation() << " name=\"" << nodep->name() << "\""
-                 << " submodname=\"" << nodep->name() << "\""
-                 << " hier=\"" << nodep->name() << "\"";
-            m_hier = nodep->name() + ".";
+                 << nodep->fileline()->xmlDetailedLocation()  //
+                 << " name=\"" << nodep->prettyName() << "\""
+                 << " submodname=\"" << nodep->prettyName() << "\""
+                 << " hier=\"" << nodep->prettyName() << "\"";
+            m_hier = nodep->prettyName() + ".";
             m_hasChildren = false;
             iterateChildren(nodep);
             if (m_hasChildren) {
diff --git a/src/V3File.cpp b/src/V3File.cpp
index 89bf07940..fe9550838 100644
--- a/src/V3File.cpp
+++ b/src/V3File.cpp
@@ -965,7 +965,7 @@ protected:
 public:
     VIdProtectImp() {
         passthru("this");
-        passthru("TOPp");
+        passthru("TOP");
         passthru("vlSelf");
         passthru("vlSymsp");
     }
diff --git a/src/V3LinkDot.cpp b/src/V3LinkDot.cpp
index d8b39c9eb..33a576ebc 100644
--- a/src/V3LinkDot.cpp
+++ b/src/V3LinkDot.cpp
@@ -592,13 +592,10 @@ public:
                 // $root we walk up to Netlist
                 else if (ident == "$root") {
                     lookupSymp = rootEntp();
-                    // We've added TOP module, now everything else is one lower
+                    // We've added the '$root' module, now everything else is one lower
                     if (!m_forPrearray) {
-                        VSymEnt* topSymp = lookupSymp->findIdFlat("TOP");
-                        if (!topSymp) {
-                            topSymp->nodep()->v3fatalSrc("TOP not found under netlist for $root");
-                        }
-                        lookupSymp = topSymp;
+                        lookupSymp = lookupSymp->findIdFlat(ident);
+                        UASSERT(lookupSymp, "Cannot find $root module under netlist");
                     }
                 }
                 // Move up and check cellname + modname
diff --git a/src/V3LinkLevel.cpp b/src/V3LinkLevel.cpp
index add541016..52a0ac057 100644
--- a/src/V3LinkLevel.cpp
+++ b/src/V3LinkLevel.cpp
@@ -139,7 +139,9 @@ void V3LinkLevel::wrapTop(AstNetlist* rootp) {
         UINFO(1, "No module found to wrap\n");
         return;
     }
-    AstNodeModule* newmodp = new AstModule(oldmodp->fileline(), string("TOP"));
+
+    AstNodeModule* newmodp = new AstModule(oldmodp->fileline(), "$root");
+    newmodp->name(AstNode::encodeName(newmodp->name()));  // so origName is nice
     // Make the new module first in the list
     oldmodp->unlinkFrBackWithNext();
     newmodp->addNext(oldmodp);
diff --git a/src/V3Partition.cpp b/src/V3Partition.cpp
index 4f51ed0ec..f63124957 100644
--- a/src/V3Partition.cpp
+++ b/src/V3Partition.cpp
@@ -2617,9 +2617,10 @@ static void addMTaskToFunction(const ThreadSchedule& schedule, const uint32_t th
         recName = "__Vprfthr_" + cvtToStr(mtaskp->id());
         addStrStmt("VlProfileRec* " + recName + " = nullptr;\n");
         // Leave this if() here, as don't want to call VL_RDTSC_Q unless profiling
-        addStrStmt("if (VL_UNLIKELY(vlSelf->__Vm_profile_cycle_start)) {\n" +  //
-                   recName + " = vlSelf->__Vm_threadPoolp->profileAppend();\n" +  //
-                   recName + "->startRecord(VL_RDTSC_Q() - vlSelf->__Vm_profile_cycle_start," +  //
+        addStrStmt("if (VL_UNLIKELY(vlSymsp->__Vm_profile_cycle_start)) {\n" +  //
+                   recName + " = vlSymsp->__Vm_threadPoolp->profileAppend();\n" +  //
+                   recName + "->startRecord(VL_RDTSC_Q() - vlSymsp->__Vm_profile_cycle_start,"
+                   +  //
                    " " + cvtToStr(mtaskp->id()) + "," +  //
                    " " + cvtToStr(mtaskp->cost()) + ");\n" +  //
                    "}\n");
@@ -2634,7 +2635,7 @@ static void addMTaskToFunction(const ThreadSchedule& schedule, const uint32_t th
     if (v3Global.opt.profThreads()) {
         // Leave this if() here, as don't want to call VL_RDTSC_Q unless profiling
         addStrStmt("if (VL_UNLIKELY(" + recName + ")) {\n" +  //
-                   recName + "->endRecord(VL_RDTSC_Q() - vlSelf->__Vm_profile_cycle_start);\n"
+                   recName + "->endRecord(VL_RDTSC_Q() - vlSymsp->__Vm_profile_cycle_start);\n"
                    + "}\n");
     }
 
@@ -2672,7 +2673,7 @@ static const std::vector<AstCFunc*> createThreadFunctions(const ThreadSchedule&
         funcp->argTypes("void* voidSelf, bool even_cycle");
 
         // Setup vlSelf an vlSyms
-        funcp->addStmtsp(new AstCStmt(fl, EmitCBaseVisitor::voidSelfAssign()));
+        funcp->addStmtsp(new AstCStmt(fl, EmitCBaseVisitor::voidSelfAssign(modp)));
         funcp->addStmtsp(new AstCStmt(fl, EmitCBaseVisitor::symClassAssign()));
 
         // Invoke each mtask scheduled to this thread from the thread function
@@ -2710,26 +2711,26 @@ static void addThreadStartToExecGraph(AstExecGraph* const execGraphp,
         execGraphp->addStmtsp(new AstText(fl, text, /* tracking: */ true));
     };
 
-    addStrStmt("vlSelf->__Vm_even_cycle = !vlSelf->__Vm_even_cycle;\n");
+    addStrStmt("vlSymsp->__Vm_even_cycle = !vlSymsp->__Vm_even_cycle;\n");
 
     const uint32_t last = funcps.size() - 1;
     for (uint32_t i = 0; i <= last; ++i) {
         AstCFunc* const funcp = funcps.at(i);
         if (i != last) {
             // The first N-1 will run on the thread pool.
-            addTextStmt("vlSelf->__Vm_threadPoolp->workerp(" + cvtToStr(i) + ")->addTask(");
+            addTextStmt("vlSymsp->__Vm_threadPoolp->workerp(" + cvtToStr(i) + ")->addTask(");
             execGraphp->addStmtsp(new AstAddrOfCFunc(fl, funcp));
-            addTextStmt(", vlSelf, vlSelf->__Vm_even_cycle);\n");
+            addTextStmt(", vlSelf, vlSymsp->__Vm_even_cycle);\n");
         } else {
             // The last will run on the main thread.
             AstCCall* const callp = new AstCCall(fl, funcp);
-            callp->argTypes("vlSelf, vlSelf->__Vm_even_cycle");
+            callp->argTypes("vlSelf, vlSymsp->__Vm_even_cycle");
             execGraphp->addStmtsp(callp);
             addStrStmt("Verilated::mtaskId(0);\n");
         }
     }
 
-    addStrStmt("vlSelf->__Vm_mtaskstate_final.waitUntilUpstreamDone(vlSelf->__Vm_even_cycle);\n");
+    addStrStmt("vlSelf->__Vm_mtaskstate_final.waitUntilUpstreamDone(vlSymsp->__Vm_even_cycle);\n");
 }
 
 static void implementExecGraph(AstExecGraph* const execGraphp) {
diff --git a/src/Verilator.cpp b/src/Verilator.cpp
index 8ee9b114f..9a742cafd 100644
--- a/src/Verilator.cpp
+++ b/src/Verilator.cpp
@@ -511,6 +511,7 @@ static void process() {
         V3EmitC::emitcInlines();
         V3EmitC::emitcSyms();
         V3EmitC::emitcConstPool();
+        V3EmitC::emitcModel();
         V3EmitC::emitcTrace();
     } else if (v3Global.opt.dpiHdrOnly()) {
         V3EmitC::emitcSyms(true);
diff --git a/test_regress/t/t_alw_noreorder.pl b/test_regress/t/t_alw_noreorder.pl
index 392808699..b0543df38 100755
--- a/test_regress/t/t_alw_noreorder.pl
+++ b/test_regress/t/t_alw_noreorder.pl
@@ -19,8 +19,8 @@ file_grep($Self->{stats}, qr/Optimizations, Split always\s+(\d+)/i, 0);
 # Here we should see some dly vars since reorder is disabled.
 # (Whereas our twin test, t_alw_reorder, should see no dly vars
 #  since it enables the reorder step.)
-file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.cpp", qr/dly__t__DOT__v1/i);
-file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.cpp", qr/dly__t__DOT__v2/i);
+file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root.cpp", qr/dly__t__DOT__v1/i);
+file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root.cpp", qr/dly__t__DOT__v2/i);
 
 execute(
     check_finished=>1,
diff --git a/test_regress/t/t_c_this.pl b/test_regress/t/t_c_this.pl
index 4260beacc..37616efd7 100755
--- a/test_regress/t/t_c_this.pl
+++ b/test_regress/t/t_c_this.pl
@@ -15,7 +15,7 @@ compile();
 if ($Self->{vlt_all}) {
     # The word 'this' (but only the whole word 'this' should have been replaced
     # in the contents.
-    my $file = "$Self->{obj_dir}/$Self->{VM_PREFIX}.cpp";
+    my $file = "$Self->{obj_dir}/$Self->{VM_PREFIX}___024root.cpp";
     my $text = file_contents($file);
     error("$file has 'this->clk'") if ($text =~ m/\bthis->clk\b/);
     error("$file does not have 'xthis'") if ($text !~ m/\bxthis\b/);
diff --git a/test_regress/t/t_debug_emitv.out b/test_regress/t/t_debug_emitv.out
index f42904c37..d10784ec3 100644
--- a/test_regress/t/t_debug_emitv.out
+++ b/test_regress/t/t_debug_emitv.out
@@ -1,4 +1,4 @@
-module Vt_debug_emitv;
+module Vt_debug_emitv___024root;
     input logic clk;
     input logic in;
     signed int [31:0]  t.array[0:2];
diff --git a/test_regress/t/t_dist_portability.pl b/test_regress/t/t_dist_portability.pl
index 78c4d6279..99fa2f164 100755
--- a/test_regress/t/t_dist_portability.pl
+++ b/test_regress/t/t_dist_portability.pl
@@ -80,7 +80,7 @@ sub cstr {
     my $grep = `$cmd`;
     my %names;
     foreach my $line (split /\n/, $grep) {
-        if ($line =~ /^([^:]+).*\(\)[a-z0-9_().->]*[.->]+(c_str|r?begin|r?end)\(\)/) {
+        if ($line =~ /^([^:]+)[^"]*\(\)[a-z0-9_().->]*[.->]+(c_str|r?begin|r?end)\(\)/) {
             next if $line =~ /lintok-begin-on-ref/;
             print "$line\n";
             $names{$1} = 1;
diff --git a/test_regress/t/t_emit_memb_limit.pl b/test_regress/t/t_emit_memb_limit.pl
index 931ba7569..7920f341a 100755
--- a/test_regress/t/t_emit_memb_limit.pl
+++ b/test_regress/t/t_emit_memb_limit.pl
@@ -55,7 +55,7 @@ execute(
     check_finished => 1,
     );
 
-file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/struct \{/);
+file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root.h", qr/struct \{/);
 
 ok(1);
 1;
diff --git a/test_regress/t/t_flag_comp_limit_parens.pl b/test_regress/t/t_flag_comp_limit_parens.pl
index e1ffcfc7b..11731a873 100755
--- a/test_regress/t/t_flag_comp_limit_parens.pl
+++ b/test_regress/t/t_flag_comp_limit_parens.pl
@@ -18,7 +18,7 @@ execute(
     check_finished => 1,
     );
 
-file_grep("$Self->{obj_dir}/Vt_flag_comp_limit_parens__Slow.cpp", qr/Vdeeptemp/x);
+file_grep("$Self->{obj_dir}/Vt_flag_comp_limit_parens___024root__Slow.cpp", qr/Vdeeptemp/x);
 
 ok(1);
 1;
diff --git a/test_regress/t/t_flag_csplit_off.pl b/test_regress/t/t_flag_csplit_off.pl
index 17c865a6a..d29b8f2ef 100755
--- a/test_regress/t/t_flag_csplit_off.pl
+++ b/test_regress/t/t_flag_csplit_off.pl
@@ -60,6 +60,7 @@ while (1) {
 
 sub check_no_splits {
     foreach my $file (glob("$Self->{obj_dir}/*.cpp")) {
+        $file =~ s/__024root//;
         if ($file =~ qr/__\d/) {
             error("Split file found: $file");
         }
diff --git a/test_regress/t/t_flag_xinitial_0.pl b/test_regress/t/t_flag_xinitial_0.pl
index c14556cdc..167593271 100755
--- a/test_regress/t/t_flag_xinitial_0.pl
+++ b/test_regress/t/t_flag_xinitial_0.pl
@@ -18,7 +18,7 @@ execute(
     check_finished => 1,
     );
 
-file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}__Slow.cpp", qr/VL_RAND_RESET/);
+file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root__Slow.cpp", qr/VL_RAND_RESET/);
 
 ok(1);
 1;
diff --git a/test_regress/t/t_flag_xinitial_unique.pl b/test_regress/t/t_flag_xinitial_unique.pl
index b94639b4e..572880d86 100755
--- a/test_regress/t/t_flag_xinitial_unique.pl
+++ b/test_regress/t/t_flag_xinitial_unique.pl
@@ -18,7 +18,7 @@ execute(
     check_finished => 1,
     );
 
-file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}__Slow.cpp", qr/VL_RAND_RESET/);
+file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root__Slow.cpp", qr/VL_RAND_RESET/);
 
 ok(1);
 1;
diff --git a/test_regress/t/t_foreach.pl b/test_regress/t/t_foreach.pl
index f5e2135cc..06fc908f0 100755
--- a/test_regress/t/t_foreach.pl
+++ b/test_regress/t/t_foreach.pl
@@ -20,14 +20,14 @@ execute(
 
 # We expect all loops should be unrolled by verilator,
 # none of the loop variables should exist in the output:
-file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}.cpp", qr/index_/);
-file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}__Slow.cpp", qr/index_/);
+file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root.cpp", qr/index_/);
+file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root__Slow.cpp", qr/index_/);
 
 # Further, we expect that all logic within the loop should
 # have been evaluated inside the compiler. So there should be
 # no references to 'sum' in the .cpp.
-file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}.cpp", qr/sum/);
-file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}__Slow.cpp", qr/sum/);
+file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root.cpp", qr/sum/);
+file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root__Slow.cpp", qr/sum/);
 
 ok(1);
 1;
diff --git a/test_regress/t/t_optm_if_array.pl b/test_regress/t/t_optm_if_array.pl
index 21408ee20..2b2ca158f 100755
--- a/test_regress/t/t_optm_if_array.pl
+++ b/test_regress/t/t_optm_if_array.pl
@@ -17,8 +17,8 @@ execute(
     check_finished => 1,
     );
 
-file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}.cpp", qr/rstn_r/);
-file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}__Slow.cpp", qr/rstn_r/);
+file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root.cpp", qr/rstn_r/);
+file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root__Slow.cpp", qr/rstn_r/);
 
 ok(1);
 1;
diff --git a/test_regress/t/t_optm_redor.pl b/test_regress/t/t_optm_redor.pl
index 21408ee20..2b2ca158f 100755
--- a/test_regress/t/t_optm_redor.pl
+++ b/test_regress/t/t_optm_redor.pl
@@ -17,8 +17,8 @@ execute(
     check_finished => 1,
     );
 
-file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}.cpp", qr/rstn_r/);
-file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}__Slow.cpp", qr/rstn_r/);
+file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root.cpp", qr/rstn_r/);
+file_grep_not("$Self->{obj_dir}/$Self->{VM_PREFIX}___024root__Slow.cpp", qr/rstn_r/);
 
 ok(1);
 1;
diff --git a/test_regress/t/t_protect_ids_key.out b/test_regress/t/t_protect_ids_key.out
index 0eeb97a9f..7a7d53d4b 100644
--- a/test_regress/t/t_protect_ids_key.out
+++ b/test_regress/t/t_protect_ids_key.out
@@ -1,11 +1,12 @@
 <?xml version="1.0" ?>
 <!-- DESCRIPTION: Verilator output: XML representation of netlist -->
 <verilator_id_map>
+  <map from="TOP" to="TOP"/>
   <map from="PSlhR1" to="TOP__t__DOT__secret_inst"/>
-  <map from="TOPp" to="TOPp"/>
   <map from="PS5Fdb" to="Vt_protect_ids_key__Vcb_dpix_a_func_t"/>
   <map from="PSlYpp" to="Vt_protect_ids_key__Vcb_dpix_a_task_t"/>
   <map from="PSOAAo" to="_Syms"/>
+  <map from="PS9tBB" to="__024root"/>
   <map from="PSm6SZ" to="__PVT__secret_cyc"/>
   <map from="PSfqIT" to="__PVT__secret_cyc_r"/>
   <map from="PStVCQ" to="__PVT__secret_r"/>
diff --git a/test_regress/t/t_trace_two_cc.cpp b/test_regress/t/t_trace_two_cc.cpp
index 4b445b8ed..02c639418 100644
--- a/test_regress/t/t_trace_two_cc.cpp
+++ b/test_regress/t/t_trace_two_cc.cpp
@@ -22,8 +22,9 @@
 
 // Compile in place
 #include "Vt_trace_two_b.cpp"
-#include "Vt_trace_two_b__Slow.cpp"
 #include "Vt_trace_two_b__Syms.cpp"
+#include "Vt_trace_two_b___024root.cpp"
+#include "Vt_trace_two_b___024root__Slow.cpp"
 #include "Vt_trace_two_b__Trace.cpp"
 #include "Vt_trace_two_b__Trace__Slow.cpp"
 
diff --git a/test_regress/t/t_trace_two_sc.cpp b/test_regress/t/t_trace_two_sc.cpp
index 6d0c0e125..7547853d5 100644
--- a/test_regress/t/t_trace_two_sc.cpp
+++ b/test_regress/t/t_trace_two_sc.cpp
@@ -18,7 +18,8 @@
 
 // Compile in place
 #include "Vt_trace_two_b.cpp"
-#include "Vt_trace_two_b__Slow.cpp"
+#include "Vt_trace_two_b___024root.cpp"
+#include "Vt_trace_two_b___024root__Slow.cpp"
 #include "Vt_trace_two_b__Syms.cpp"
 #include "Vt_trace_two_b__Trace.cpp"
 #include "Vt_trace_two_b__Trace__Slow.cpp"
diff --git a/test_regress/t/t_tri_inz.cpp b/test_regress/t/t_tri_inz.cpp
index c9393b5f3..fb0934859 100644
--- a/test_regress/t/t_tri_inz.cpp
+++ b/test_regress/t/t_tri_inz.cpp
@@ -4,6 +4,7 @@
 // SPDX-License-Identifier: CC0-1.0
 
 #include "Vt_tri_inz.h"
+#include "Vt_tri_inz___024root.h"
 
 VM_PREFIX* tb = nullptr;
 bool pass = true;
@@ -19,7 +20,7 @@ void checkone(const char* name, int got, int exp) {
 
 void check(int d, int en, int exp0, int exp1, int expx, int expz) {
     tb->d = d;
-    tb->d__en0 = en;
+    tb->rootp->d__en0 = en;
     tb->eval();
 #ifdef TEST_VERBOSE
     printf("Drive d=%d en=%d got0=%d/1=%d/x=%d/z=%d  exp0=%d/1=%d/x=%d/z=%d\n", d, en, tb->ext0,
diff --git a/test_regress/t/t_unopt_converge_initial_run_bad.out b/test_regress/t/t_unopt_converge_initial_run_bad.out
index 5445309d7..a410304f6 100644
--- a/test_regress/t/t_unopt_converge_initial_run_bad.out
+++ b/test_regress/t/t_unopt_converge_initial_run_bad.out
@@ -1,5 +1,5 @@
 -V{t#,#}- Verilated::debug is on. Message prefix indicates {<thread>,<sequence_number>}.
--V{t#,#}+    Vt_unopt_converge_initial_run_bad___change_request
+-V{t#,#}+    Vt_unopt_converge_initial_run_bad___024root___change_request
 -V{t#,#}        CHANGE: t/t_unopt_converge_initial.v:19: x
 %Error: t/t_unopt_converge_initial.v:7: Verilated model didn't DC converge
 Aborting...
diff --git a/test_regress/t/t_unopt_converge_print_bad.out b/test_regress/t/t_unopt_converge_print_bad.out
index 0b271c309..800401d79 100644
--- a/test_regress/t/t_unopt_converge_print_bad.out
+++ b/test_regress/t/t_unopt_converge_print_bad.out
@@ -1,5 +1,5 @@
 -V{t#,#}- Verilated::debug is on. Message prefix indicates {<thread>,<sequence_number>}.
--V{t#,#}+    Vt_unopt_converge_print_bad___change_request
+-V{t#,#}+    Vt_unopt_converge_print_bad___024root___change_request
 -V{t#,#}        CHANGE: t/t_unopt_converge.v:19: x
 %Error: t/t_unopt_converge.v:7: Verilated model didn't converge
 Aborting...
diff --git a/test_regress/t/t_unopt_converge_run_bad.out b/test_regress/t/t_unopt_converge_run_bad.out
index 362f65931..123a3e718 100644
--- a/test_regress/t/t_unopt_converge_run_bad.out
+++ b/test_regress/t/t_unopt_converge_run_bad.out
@@ -1,5 +1,5 @@
 -V{t#,#}- Verilated::debug is on. Message prefix indicates {<thread>,<sequence_number>}.
--V{t#,#}+    Vt_unopt_converge_run_bad___change_request
+-V{t#,#}+    Vt_unopt_converge_run_bad___024root___change_request
 -V{t#,#}        CHANGE: t/t_unopt_converge.v:19: x
 %Error: t/t_unopt_converge.v:7: Verilated model didn't converge
 Aborting...
diff --git a/test_regress/t/t_var_pins_cc.pl b/test_regress/t/t_var_pins_cc.pl
index cdbb061e8..6c48aeee9 100755
--- a/test_regress/t/t_var_pins_cc.pl
+++ b/test_regress/t/t_var_pins_cc.pl
@@ -20,19 +20,19 @@ compile(
     );
 
 {
-    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_IN8  \(i1,0,0\);/x);
-    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_IN8  \(i8,7,0\);/x);
-    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_IN16 \(i16,15,0\);/x);
-    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_IN   \(i32,31,0\);/x);
-    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_IN64 \(i64,63,0\);/x);
-    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_INW  \(i65,64,0,3\);/x);
+    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_IN8  \(&i1,0,0\);/x);
+    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_IN8  \(&i8,7,0\);/x);
+    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_IN16 \(&i16,15,0\);/x);
+    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_IN   \(&i32,31,0\);/x);
+    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_IN64 \(&i64,63,0\);/x);
+    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_INW  \(\(&i65\),64,0,3\);/x);
 
-    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_OUT8 \(o1,0,0\);/x);
-    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_OUT8 \(o8,7,0\);/x);
-    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_OUT16\(o16,15,0\);/x);
-    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_OUT  \(o32,31,0\);/x);
-    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_OUT64\(o64,63,0\);/x);
-    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_OUTW \(o65,64,0,3\);/x);
+    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_OUT8 \(&o1,0,0\);/x);
+    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_OUT8 \(&o8,7,0\);/x);
+    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_OUT16\(&o16,15,0\);/x);
+    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_OUT  \(&o32,31,0\);/x);
+    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_OUT64\(&o64,63,0\);/x);
+    file_grep("$Self->{obj_dir}/Vt_var_pins_cc.h", qr/VL_OUTW \(\(&o65\),64,0,3\);/x);
 }
 
 ok(1);
diff --git a/test_regress/t/t_var_pins_sc1.pl b/test_regress/t/t_var_pins_sc1.pl
index 920eb8807..6e7485b34 100755
--- a/test_regress/t/t_var_pins_sc1.pl
+++ b/test_regress/t/t_var_pins_sc1.pl
@@ -18,27 +18,27 @@ compile(
     );
 
 if ($Self->{vlt_all}) {
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ i1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<8>\s> \s+ i8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ i16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<32>\s> \s+ i32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<64>\s> \s+ i64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<65>\s> \s+ i65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ ibv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ ibv16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ ibv1_vlt;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ ibv16_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &i1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<8>\s> \s+ &i8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &i16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<32>\s> \s+ &i32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<64>\s> \s+ &i64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<65>\s> \s+ &i65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &ibv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &ibv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &ibv1_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &ibv16_vlt;/x);
 
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ o1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<8>\s> \s+ o8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ o16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<32>\s> \s+ o32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<64>\s> \s+ o64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<65>\s> \s+ o65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ obv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ obv16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ obv1_vlt;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ obv16_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &o1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<8>\s> \s+ &o8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &o16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<32>\s> \s+ &o32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<64>\s> \s+ &o64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<65>\s> \s+ &o65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &obv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &obv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &obv1_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &obv16_vlt;/x);
 }
 
 execute();
diff --git a/test_regress/t/t_var_pins_sc2.pl b/test_regress/t/t_var_pins_sc2.pl
index c37403933..8edb72dbd 100755
--- a/test_regress/t/t_var_pins_sc2.pl
+++ b/test_regress/t/t_var_pins_sc2.pl
@@ -18,27 +18,27 @@ compile(
     );
 
 {
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ i1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<8>\s> \s+ i8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ i16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<32>\s> \s+ i32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<64>\s> \s+ i64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<65>\s> \s+ i65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ ibv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ ibv16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ ibv1_vlt;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ ibv16_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ &i1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<8>\s> \s+ &i8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &i16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<32>\s> \s+ &i32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<64>\s> \s+ &i64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<65>\s> \s+ &i65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &ibv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &ibv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &ibv1_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &ibv16_vlt;/x);
 
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ o1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<8>\s> \s+ o8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ o16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<32>\s> \s+ o32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<64>\s> \s+ o64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<65>\s> \s+ o65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ obv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ obv16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ obv1_vlt;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ obv16_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ &o1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<8>\s> \s+ &o8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &o16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<32>\s> \s+ &o32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<64>\s> \s+ &o64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<65>\s> \s+ &o65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &obv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &obv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &obv1_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &obv16_vlt;/x);
 }
 
 execute();
diff --git a/test_regress/t/t_var_pins_sc32.pl b/test_regress/t/t_var_pins_sc32.pl
index ed6db0cb3..6f202e8b5 100755
--- a/test_regress/t/t_var_pins_sc32.pl
+++ b/test_regress/t/t_var_pins_sc32.pl
@@ -18,27 +18,27 @@ compile(
     );
 
 {
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ i1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ i8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ i16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ i32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<64>\s> \s+ i64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<65>\s> \s+ i65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ ibv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ ibv16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ ibv1_vlt;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ ibv16_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ &i1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ &i8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ &i16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ &i32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<64>\s> \s+ &i64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<65>\s> \s+ &i65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &ibv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &ibv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &ibv1_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &ibv16_vlt;/x);
 
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ o1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ o8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ o16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ o32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<64>\s> \s+ o64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<65>\s> \s+ o65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ obv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ obv16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ obv1_vlt;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ obv16_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ &o1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ &o8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ &o16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ &o32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<64>\s> \s+ &o64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<65>\s> \s+ &o65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &obv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &obv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &obv1_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &obv16_vlt;/x);
 }
 
 execute();
diff --git a/test_regress/t/t_var_pins_sc64.pl b/test_regress/t/t_var_pins_sc64.pl
index cedf0208e..ec4a48b94 100755
--- a/test_regress/t/t_var_pins_sc64.pl
+++ b/test_regress/t/t_var_pins_sc64.pl
@@ -18,27 +18,27 @@ compile(
     );
 
 if ($Self->{vlt_all}) {
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ i1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ i8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ i16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ i32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<vluint64_t> \s+ i64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<65>\s> \s+ i65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ ibv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ ibv16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ ibv1_vlt;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ ibv16_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ &i1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ &i8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ &i16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ &i32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<vluint64_t> \s+ &i64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<65>\s> \s+ &i65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &ibv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &ibv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &ibv1_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &ibv16_vlt;/x);
 
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ o1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ o8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ o16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ o32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<vluint64_t> \s+ o64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<65>\s> \s+ o65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ obv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ obv16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ obv1_vlt;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ obv16_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ &o1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ &o8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ &o16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ &o32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<vluint64_t> \s+ &o64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<65>\s> \s+ &o65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &obv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &obv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &obv1_vlt;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &obv16_vlt;/x);
 }
 
 execute();
diff --git a/test_regress/t/t_var_pins_sc_biguint.pl b/test_regress/t/t_var_pins_sc_biguint.pl
index 42b06c465..bb64269ce 100755
--- a/test_regress/t/t_var_pins_sc_biguint.pl
+++ b/test_regress/t/t_var_pins_sc_biguint.pl
@@ -18,27 +18,27 @@ compile(
     );
 
 if ($Self->{vlt_all}) {
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ i1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ i8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ i16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ i32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<vluint64_t> \s+ i64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_biguint<65>\s> \s+ i65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_biguint<128>\s> \s+ i128;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<513>\s> \s+ i513;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ ibv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ ibv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ &i1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ &i8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ &i16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ &i32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<vluint64_t> \s+ &i64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_biguint<65>\s> \s+ &i65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_biguint<128>\s> \s+ &i128;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<513>\s> \s+ &i513;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &ibv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &ibv16;/x);
 
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ o1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ o8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ o16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ o32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<vluint64_t> \s+ o64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_biguint<65>\s> \s+ o65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_biguint<128>\s> \s+ o128;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<513>\s> \s+ o513;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ obv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ obv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ &o1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ &o8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ &o16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ &o32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<vluint64_t> \s+ &o64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_biguint<65>\s> \s+ &o65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_biguint<128>\s> \s+ &o128;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<513>\s> \s+ &o513;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &obv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &obv16;/x);
 }
 
 execute();
diff --git a/test_regress/t/t_var_pins_sc_uint.pl b/test_regress/t/t_var_pins_sc_uint.pl
index 28a2513b5..e7b965c3a 100755
--- a/test_regress/t/t_var_pins_sc_uint.pl
+++ b/test_regress/t/t_var_pins_sc_uint.pl
@@ -18,27 +18,27 @@ compile(
     );
 
 {
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ i1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<8>\s> \s+ i8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<16>\s> \s+ i16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<32>\s> \s+ i32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<64>\s> \s+ i64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<65>\s> \s+ i65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<128>\s> \s+ i128;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<513>\s> \s+ i513;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ ibv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ ibv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ &i1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<8>\s> \s+ &i8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<16>\s> \s+ &i16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<32>\s> \s+ &i32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<64>\s> \s+ &i64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<65>\s> \s+ &i65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<128>\s> \s+ &i128;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<513>\s> \s+ &i513;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &ibv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &ibv16;/x);
 
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ o1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<8>\s> \s+ o8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<16>\s> \s+ o16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<32>\s> \s+ o32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<64>\s> \s+ o64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<65>\s> \s+ o65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<128>\s> \s+ o128;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<513>\s> \s+ o513;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ obv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ obv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ &o1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<8>\s> \s+ &o8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<16>\s> \s+ &o16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<32>\s> \s+ &o32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<64>\s> \s+ &o64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<65>\s> \s+ &o65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<128>\s> \s+ &o128;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<513>\s> \s+ &o513;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &obv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &obv16;/x);
 }
 
 execute();
diff --git a/test_regress/t/t_var_pins_sc_uint_biguint.pl b/test_regress/t/t_var_pins_sc_uint_biguint.pl
index 363ec234c..64b7075a7 100755
--- a/test_regress/t/t_var_pins_sc_uint_biguint.pl
+++ b/test_regress/t/t_var_pins_sc_uint_biguint.pl
@@ -18,27 +18,27 @@ compile(
     );
 
 {
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ i1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<8>\s> \s+ i8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<16>\s> \s+ i16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<32>\s> \s+ i32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<64>\s> \s+ i64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_biguint<65>\s> \s+ i65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_biguint<128>\s> \s+ i128;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<513>\s> \s+ i513;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ ibv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ ibv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ &i1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<8>\s> \s+ &i8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<16>\s> \s+ &i16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<32>\s> \s+ &i32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_uint<64>\s> \s+ &i64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_biguint<65>\s> \s+ &i65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_biguint<128>\s> \s+ &i128;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<513>\s> \s+ &i513;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &ibv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &ibv16;/x);
 
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ o1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<8>\s> \s+ o8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<16>\s> \s+ o16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<32>\s> \s+ o32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<64>\s> \s+ o64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_biguint<65>\s> \s+ o65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_biguint<128>\s> \s+ o128;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<513>\s> \s+ o513;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ obv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ obv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ &o1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<8>\s> \s+ &o8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<16>\s> \s+ &o16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<32>\s> \s+ &o32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_uint<64>\s> \s+ &o64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_biguint<65>\s> \s+ &o65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_biguint<128>\s> \s+ &o128;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<513>\s> \s+ &o513;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &obv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &obv16;/x);
 }
 
 execute();
diff --git a/test_regress/t/t_var_pins_scui.pl b/test_regress/t/t_var_pins_scui.pl
index eac0b5e90..a28789078 100755
--- a/test_regress/t/t_var_pins_scui.pl
+++ b/test_regress/t/t_var_pins_scui.pl
@@ -18,23 +18,23 @@ compile(
     );
 
 if ($Self->{vlt_all}) {
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ i1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint8_t> \s+ i8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint16_t> \s+ i16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ i32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<vluint64_t> \s+ i64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<65>\s> \s+ i65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ ibv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ ibv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<bool> \s+ &i1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint8_t> \s+ &i8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint16_t> \s+ &i16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<uint32_t> \s+ &i32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<vluint64_t> \s+ &i64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<65>\s> \s+ &i65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<1>\s> \s+ &ibv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_in<sc_bv<16>\s> \s+ &ibv16;/x);
 
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ o1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint8_t> \s+ o8;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint16_t> \s+ o16;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ o32;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<vluint64_t> \s+ o64;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<65>\s> \s+ o65;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ obv1;/x);
-    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ obv16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<bool> \s+ &o1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint8_t> \s+ &o8;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint16_t> \s+ &o16;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<uint32_t> \s+ &o32;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<vluint64_t> \s+ &o64;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<65>\s> \s+ &o65;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<1>\s> \s+ &obv1;/x);
+    file_grep("$Self->{obj_dir}/$Self->{VM_PREFIX}.h", qr/sc_out<sc_bv<16>\s> \s+ &obv16;/x);
 }
 
 execute();
diff --git a/test_regress/t/t_verilated_debug.out b/test_regress/t/t_verilated_debug.out
index 0768fa5a6..5ac844a6b 100644
--- a/test_regress/t/t_verilated_debug.out
+++ b/test_regress/t/t_verilated_debug.out
@@ -1,30 +1,30 @@
 -V{t#,#}- Verilated::debug is on. Message prefix indicates {<thread>,<sequence_number>}.
--V{t#,#}+    Vt_verilated_debug___ctor_var_reset
+-V{t#,#}+    Vt_verilated_debug___024root___ctor_var_reset
 internalsDump:
   Version: Verilator ###
   Argv: obj_vlt/t_verilated_debug/Vt_verilated_debug
   scopesDump:
 
 -V{t#,#}+++++TOP Evaluate Vt_verilated_debug::eval_step
--V{t#,#}+    Vt_verilated_debug___eval_debug_assertions
--V{t#,#}+    Vt_verilated_debug___eval_initial
--V{t#,#}+    Vt_verilated_debug___initial__TOP__1
+-V{t#,#}+    Vt_verilated_debug___024root___eval_debug_assertions
+-V{t#,#}+    Vt_verilated_debug___024root___eval_initial
+-V{t#,#}+    Vt_verilated_debug___024root___initial__TOP__1
   Data: w96: 000000aa 000000bb 000000cc 
 -V{t#,#}+ Initial loop
--V{t#,#}+    Vt_verilated_debug___eval_settle
--V{t#,#}+    Vt_verilated_debug___eval
--V{t#,#}+    Vt_verilated_debug___change_request
--V{t#,#}+    Vt_verilated_debug___change_request_1
+-V{t#,#}+    Vt_verilated_debug___024root___eval_settle
+-V{t#,#}+    Vt_verilated_debug___024root___eval
+-V{t#,#}+    Vt_verilated_debug___024root___change_request
+-V{t#,#}+    Vt_verilated_debug___024root___change_request_1
 -V{t#,#}+ Clock loop
--V{t#,#}+    Vt_verilated_debug___eval
--V{t#,#}+    Vt_verilated_debug___change_request
--V{t#,#}+    Vt_verilated_debug___change_request_1
+-V{t#,#}+    Vt_verilated_debug___024root___eval
+-V{t#,#}+    Vt_verilated_debug___024root___change_request
+-V{t#,#}+    Vt_verilated_debug___024root___change_request_1
 -V{t#,#}+++++TOP Evaluate Vt_verilated_debug::eval_step
--V{t#,#}+    Vt_verilated_debug___eval_debug_assertions
+-V{t#,#}+    Vt_verilated_debug___024root___eval_debug_assertions
 -V{t#,#}+ Clock loop
--V{t#,#}+    Vt_verilated_debug___eval
--V{t#,#}+    Vt_verilated_debug___sequent__TOP__2
+-V{t#,#}+    Vt_verilated_debug___024root___eval
+-V{t#,#}+    Vt_verilated_debug___024root___sequent__TOP__2
 *-* All Finished *-*
--V{t#,#}+    Vt_verilated_debug___change_request
--V{t#,#}+    Vt_verilated_debug___change_request_1
--V{t#,#}+    Vt_verilated_debug___final
+-V{t#,#}+    Vt_verilated_debug___024root___change_request
+-V{t#,#}+    Vt_verilated_debug___024root___change_request_1
+-V{t#,#}+    Vt_verilated_debug___024root___final
diff --git a/test_regress/t/t_xml_flat.out b/test_regress/t/t_xml_flat.out
index 853f82d5e..964c5b791 100644
--- a/test_regress/t/t_xml_flat.out
+++ b/test_regress/t/t_xml_flat.out
@@ -11,10 +11,10 @@
     <file id="d" filename="t/t_xml_first.v" language="1800-2017"/>
   </module_files>
   <cells>
-    <cell fl="d7" loc="d,7,8,7,9" name="TOP" submodname="TOP" hier="TOP"/>
+    <cell fl="d7" loc="d,7,8,7,9" name="$root" submodname="$root" hier="$root"/>
   </cells>
   <netlist>
-    <module fl="d7" loc="d,7,8,7,9" name="TOP" origName="TOP" topModule="1" public="true">
+    <module fl="d7" loc="d,7,8,7,9" name="$root" origName="$root" topModule="1" public="true">
       <var fl="d13" loc="d,13,10,13,13" name="clk" dtype_id="1" dir="input" pinIndex="2" vartype="logic" origName="clk" clocker="true" public="true"/>
       <var fl="d14" loc="d,14,16,14,17" name="d" dtype_id="2" dir="input" pinIndex="3" vartype="logic" origName="d" public="true"/>
       <var fl="d15" loc="d,15,22,15,23" name="q" dtype_id="2" dir="output" pinIndex="1" vartype="logic" origName="q" public="true"/>
diff --git a/test_regress/t/t_xml_flat_no_inline_mod.out b/test_regress/t/t_xml_flat_no_inline_mod.out
index 0ab79da52..e1d070bce 100644
--- a/test_regress/t/t_xml_flat_no_inline_mod.out
+++ b/test_regress/t/t_xml_flat_no_inline_mod.out
@@ -11,10 +11,10 @@
     <file id="d" filename="t/t_xml_flat_no_inline_mod.v" language="1800-2017"/>
   </module_files>
   <cells>
-    <cell fl="d11" loc="d,11,8,11,11" name="TOP" submodname="TOP" hier="TOP"/>
+    <cell fl="d11" loc="d,11,8,11,11" name="$root" submodname="$root" hier="$root"/>
   </cells>
   <netlist>
-    <module fl="d11" loc="d,11,8,11,11" name="TOP" origName="TOP" topModule="1" public="true">
+    <module fl="d11" loc="d,11,8,11,11" name="$root" origName="$root" topModule="1" public="true">
       <var fl="d11" loc="d,11,24,11,29" name="i_clk" dtype_id="1" dir="input" pinIndex="1" vartype="logic" origName="i_clk" public="true"/>
       <var fl="d11" loc="d,11,24,11,29" name="top.i_clk" dtype_id="1" vartype="logic" origName="i_clk"/>
       <var fl="d7" loc="d,7,24,7,29" name="top.f.i_clk" dtype_id="1" vartype="logic" origName="i_clk"/>
diff --git a/test_regress/t/t_xml_flat_pub_mod.out b/test_regress/t/t_xml_flat_pub_mod.out
index 557437eb3..88b51b3ca 100644
--- a/test_regress/t/t_xml_flat_pub_mod.out
+++ b/test_regress/t/t_xml_flat_pub_mod.out
@@ -11,10 +11,10 @@
     <file id="d" filename="t/t_xml_flat_pub_mod.v" language="1800-2017"/>
   </module_files>
   <cells>
-    <cell fl="d11" loc="d,11,8,11,11" name="TOP" submodname="TOP" hier="TOP"/>
+    <cell fl="d11" loc="d,11,8,11,11" name="$root" submodname="$root" hier="$root"/>
   </cells>
   <netlist>
-    <module fl="d11" loc="d,11,8,11,11" name="TOP" origName="TOP" topModule="1" public="true">
+    <module fl="d11" loc="d,11,8,11,11" name="$root" origName="$root" topModule="1" public="true">
       <var fl="d11" loc="d,11,24,11,29" name="i_clk" dtype_id="1" dir="input" pinIndex="1" vartype="logic" origName="i_clk" public="true"/>
       <var fl="d11" loc="d,11,24,11,29" name="top.i_clk" dtype_id="1" vartype="logic" origName="i_clk"/>
       <var fl="d7" loc="d,7,24,7,29" name="top.f.i_clk" dtype_id="1" vartype="logic" origName="i_clk"/>
diff --git a/test_regress/t/t_xml_flat_vlvbound.out b/test_regress/t/t_xml_flat_vlvbound.out
index 86271d4b1..28a1c9e97 100644
--- a/test_regress/t/t_xml_flat_vlvbound.out
+++ b/test_regress/t/t_xml_flat_vlvbound.out
@@ -11,10 +11,10 @@
     <file id="d" filename="t/t_xml_flat_vlvbound.v" language="1800-2017"/>
   </module_files>
   <cells>
-    <cell fl="d7" loc="d,7,8,7,21" name="TOP" submodname="TOP" hier="TOP"/>
+    <cell fl="d7" loc="d,7,8,7,21" name="$root" submodname="$root" hier="$root"/>
   </cells>
   <netlist>
-    <module fl="d7" loc="d,7,8,7,21" name="TOP" origName="TOP" topModule="1" public="true">
+    <module fl="d7" loc="d,7,8,7,21" name="$root" origName="$root" topModule="1" public="true">
       <var fl="d9" loc="d,9,25,9,28" name="i_a" dtype_id="1" dir="input" pinIndex="1" vartype="logic" origName="i_a" public="true"/>
       <var fl="d10" loc="d,10,25,10,28" name="i_b" dtype_id="1" dir="input" pinIndex="2" vartype="logic" origName="i_b" public="true"/>
       <var fl="d11" loc="d,11,25,11,28" name="o_a" dtype_id="2" dir="output" pinIndex="3" vartype="logic" origName="o_a" public="true"/>

From 2c813488f4141399224b6bebb9a8ca8645735f0f Mon Sep 17 00:00:00 2001
From: Morten Borup Petersen <morten_bp@live.dk>
Date: Thu, 1 Jul 2021 17:17:55 +0200
Subject: [PATCH 59/73] Tests: Add simulator benchmarking data option for
 regression tests (#3054)

This commit adds the '--simbenchmark' option to the regression test compile command.
The option is not intended as a fully-fledged benchmarking infrastructure, but rather a
utility for easily generating cycle- and execution time information when executing a verilated test.

As an example use case, the included test file shows how optimization level is varied across
three different builds+simulations, with the statistics for each run output to the same file in
the output directory.

Future work:
- 'sim_time' in the generated top-level main file should be a parameter.
- Given the above, the test execution script from verilog-sim-benchmark can be integrated
to generate better estimates of cycles/second through varying 'sim_time' over multiple executions.
---
 test_regress/driver.pl           | 52 ++++++++++++++++++++++++++++++++
 test_regress/t/t_benchmarksim.pl | 52 ++++++++++++++++++++++++++++++++
 2 files changed, 104 insertions(+)
 create mode 100755 test_regress/t/t_benchmarksim.pl

diff --git a/test_regress/driver.pl b/test_regress/driver.pl
index 679906687..5164fcc2f 100755
--- a/test_regress/driver.pl
+++ b/test_regress/driver.pl
@@ -697,6 +697,23 @@ sub new {
     return $self;
 }
 
+sub benchmarksim_filename {
+    my $self = (ref $_[0] ? shift : $Self);
+    return $self->{obj_dir}."/$self->{name}_benchmarksim.csv";
+}
+
+sub init_benchmarksim {
+    my $self = (ref $_[0] ? shift : $Self);
+    # Simulations with benchmarksim enabled append to the same file between runs.
+    # Test files must ensure a clean benchmark data file before executing tests.
+    my $filename = $self->benchmarksim_filename();
+    my $fh = IO::File->new(">".$filename) or die "%Error: $! ".$filename;
+    print $fh "# Verilator simulation benchmark data\n";
+    print $fh "# Test name: ".$self->{name}."\n";
+    print $fh "# Top file: ".$self->{top_filename}."\n";
+    print $fh "evals, time[s]\n";
+}
+
 sub soprint {
     my $self = (ref $_[0] ? shift : $Self);
     my $str = "$self->{scenario}/$self->{name}: ".join('',@_);
@@ -896,6 +913,7 @@ sub compile_vlt_flags {
     $self->{savable} = 1 if ($checkflags =~ /-savable\b/);
     $self->{coverage} = 1 if ($checkflags =~ /-coverage\b/);
     $self->{sanitize} = $opt_sanitize unless exists($self->{sanitize});
+    $self->{benchmarksim} = 1 if ($param{benchmarksim});
 
     my @verilator_flags = @{$param{verilator_flags}};
     unshift @verilator_flags, "--gdb" if $opt_gdb;
@@ -1738,6 +1756,10 @@ sub _make_main {
     print $fh "#define MAIN_TIME_MULTIPLIER ".($self->{main_time_multiplier} || 1)."\n";
 
     print $fh "#include <memory>\n";
+    print $fh "#include <fstream>\n" if $self->{benchmarksim};
+    print $fh "#include <chrono>\n" if $self->{benchmarksim};
+    print $fh "#include <iomanip>\n" if $self->{benchmarksim};
+
     print $fh "// OS header\n";
     print $fh "#include \"verilatedos.h\"\n";
 
@@ -1806,6 +1828,12 @@ sub _make_main {
         $set = "topp->";
     }
 
+    if ($self->{benchmarksim}) {
+        $fh->print("    std::chrono::time_point<std::chrono::steady_clock> starttime;\n");
+        $fh->print("    bool warm = false;\n");
+        $fh->print("    uint64_t n_evals = 0;\n");
+    }
+
     if ($self->{trace}) {
         $fh->print("\n");
         $fh->print("#if VM_TRACE\n");
@@ -1865,7 +1893,25 @@ sub _make_main {
         }
         _print_advance_time($self, $fh, 1, $action);
     }
+    if ($self->{benchmarksim}) {
+        $fh->print("        if (VL_UNLIKELY(!warm)) {\n");
+        $fh->print("            starttime = std::chrono::steady_clock::now();\n");
+        $fh->print("            warm = true;\n");
+        $fh->print("        } else {\n");
+        $fh->print("            ++n_evals;\n");
+        $fh->print("        }\n");
+    }
     print $fh "    }\n";
+
+    if ($self->{benchmarksim}) {
+        $fh->print("    {\n");
+        $fh->print("        const std::chrono::duration<double> exec_s =  std::chrono::steady_clock::now() - starttime;\n");
+        $fh->print("        std::ofstream benchfile(\"".$self->benchmarksim_filename()."\", std::ofstream::out | std::ofstream::app);\n");
+        $fh->print("        benchfile << std::fixed << std::setprecision(9) << n_evals << \",\" << exec_s.count() << std::endl;\n");
+        $fh->print("        benchfile.close();\n");
+        $fh->print("    }\n");
+    }
+
     print $fh "    if (!contextp->gotFinish()) {\n";
     print $fh '        vl_fatal(__FILE__, __LINE__, "main", "%Error: Timeout; never got a $finish");',"\n";
     print $fh "    }\n";
@@ -2659,6 +2705,12 @@ The equivalent of C<v_flags> and C<v_flags2>, but only for use with
 Verilator.  If a flag is a standard flag (+incdir for example) v_flags2
 should be used instead.
 
+=item benchmarksim
+
+Output the number of model evaluations and execution time of a test to
+I<test_output_dir>/I<test_name>_benchmarksim.csv. Multiple invocations
+of the same test file will append to to the same .csv file.
+
 =item xsim_flags
 
 =item xsim_flags2
diff --git a/test_regress/t/t_benchmarksim.pl b/test_regress/t/t_benchmarksim.pl
new file mode 100755
index 000000000..d8a8bb18f
--- /dev/null
+++ b/test_regress/t/t_benchmarksim.pl
@@ -0,0 +1,52 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(vlt => 1);
+
+# Use any top file
+top_filename("t/t_gen_alw.v");
+
+init_benchmarksim();
+
+# As an example, compile and simulate the top file with varying optimization level
+my @l_opt = (1,2,3);
+
+foreach my $l_opt (@l_opt) {
+    compile(
+        benchmarksim => 1,
+        v_flags2 => ["-O$l_opt"]
+        );
+
+    execute(
+        check_finished => 1,
+        );
+}
+
+my $fh = IO::File->new("<".benchmarksim_filename()) or error("Benchmark data file not found");
+my $lines = 0;
+while (defined(my $line = $fh->getline)) {
+    if ($line =~ /^#/) { next; }
+    if ($lines == 0) {
+        error("Expected header but found $line") if $line ne "evals, time[s]\n";
+    } else {
+        my @data = grep {$_ != ""} ($line =~ /(\d*\.?\d*)/g);
+        error("Expected 2 tokens on line ".$lines." but got ".scalar(@data)) if scalar(@data) != 2;
+        my $cycles = $data[0];
+        my $time = $data[1];
+        error("Invalid data on line ".$lines) if $cycles <= 0.0 || $time <= 0.0;
+    }
+    $lines += 1;
+}
+my $n_lines_expected = scalar(@l_opt) + 1;
+
+error("Expected ".$n_lines_expected." lines but found ".$lines) if int($lines) != int($n_lines_expected);
+
+1;
+ok(1);

From af277021882fc62e466bf830d8ad7f5d77674b94 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Thu, 1 Jul 2021 16:37:09 +0100
Subject: [PATCH 60/73] Fix type parameter resolution with hash collision.

We incorrectly treated two different struct types the same when passed
as an actual parameter to a `parameter type` parameter in an instance,
if the actual parameter expression both hash to the same value and the
structs have the same struct name. This is now corrected.

Fixes #3055.
---
 Changes                                   |  1 +
 src/V3Param.cpp                           | 36 +++++++++++--
 test_regress/t/t_param_type4.pl           | 21 ++++++++
 test_regress/t/t_param_type4.v            | 65 +++++++++++++++++++++++
 test_regress/t/t_param_type4_collision.pl | 24 +++++++++
 5 files changed, 142 insertions(+), 5 deletions(-)
 create mode 100755 test_regress/t/t_param_type4.pl
 create mode 100644 test_regress/t/t_param_type4.v
 create mode 100755 test_regress/t/t_param_type4_collision.pl

diff --git a/Changes b/Changes
index 9445ee23a..8abc9d626 100644
--- a/Changes
+++ b/Changes
@@ -31,6 +31,7 @@ Verilator 4.205 devel
 * Allow configure override of AR program (#2999). [ahouska]
 * In XML, show pinIndex information (#2877). [errae233]
 * Fix error on unsupported recursive functions (#2957). [Trefor Southwell]
+* Fix type parameter specialization when struct names are same (#3055). [7FM]
 
 
 Verilator 4.204 2021-06-12
diff --git a/src/V3Param.cpp b/src/V3Param.cpp
index a90403382..a09dca9e4 100644
--- a/src/V3Param.cpp
+++ b/src/V3Param.cpp
@@ -299,9 +299,13 @@ class ParamProcessor final {
         }
         return st;
     }
-    string paramValueNumber(AstNode* nodep) {
+
+    static string paramValueKey(const AstNode* nodep) {
+        if (const AstRefDType* const refp = VN_CAST_CONST(nodep, RefDType)) {
+            nodep = refp->skipRefp();
+        }
         string key = nodep->name();
-        if (AstIfaceRefDType* ifrtp = VN_CAST(nodep, IfaceRefDType)) {
+        if (const AstIfaceRefDType* const ifrtp = VN_CAST_CONST(nodep, IfaceRefDType)) {
             if (ifrtp->cellp() && ifrtp->cellp()->modp()) {
                 key = ifrtp->cellp()->modp()->name();
             } else if (ifrtp->ifacep()) {
@@ -309,11 +313,33 @@ class ParamProcessor final {
             } else {
                 nodep->v3fatalSrc("Can't parameterize interface without module name");
             }
-        } else if (AstBasicDType* bdtp = VN_CAST(nodep, BasicDType)) {
-            if (bdtp->isRanged()) {
-                key += "[" + cvtToStr(bdtp->left()) + ":" + cvtToStr(bdtp->right()) + "]";
+        } else if (const AstNodeUOrStructDType* const dtypep
+                   = VN_CAST_CONST(nodep, NodeUOrStructDType)) {
+            key += " ";
+            key += dtypep->verilogKwd();
+            key += " {";
+            for (const AstNode* memberp = dtypep->membersp(); memberp;
+                 memberp = memberp->nextp()) {
+                key += paramValueKey(memberp);
+                key += ";";
+            }
+            key += "}";
+        } else if (const AstMemberDType* const dtypep = VN_CAST_CONST(nodep, MemberDType)) {
+            key += " ";
+            key += paramValueKey(dtypep->subDTypep());
+        } else if (const AstBasicDType* const dtypep = VN_CAST_CONST(nodep, BasicDType)) {
+            if (dtypep->isRanged()) {
+                key += "[" + cvtToStr(dtypep->left()) + ":" + cvtToStr(dtypep->right()) + "]";
             }
         }
+        return key;
+    }
+
+    string paramValueNumber(AstNode* nodep) {
+        // TODO: This parameter value number lookup via a constructed key string is not
+        //       particularly robust for type parameters. We should really have a type
+        //       equivalence predicate function.
+        const string key = paramValueKey(nodep);
         V3Hash hash = V3Hasher::uncachedHash(nodep);
         // Force hash collisions -- for testing only
         if (VL_UNLIKELY(v3Global.opt.debugCollision())) hash = V3Hash();
diff --git a/test_regress/t/t_param_type4.pl b/test_regress/t/t_param_type4.pl
new file mode 100755
index 000000000..b46d46042
--- /dev/null
+++ b/test_regress/t/t_param_type4.pl
@@ -0,0 +1,21 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+compile(
+    );
+
+execute(
+    check_finished => 1,
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_param_type4.v b/test_regress/t/t_param_type4.v
new file mode 100644
index 000000000..4fd9604bd
--- /dev/null
+++ b/test_regress/t/t_param_type4.v
@@ -0,0 +1,65 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2021 by Geza Lore.
+// SPDX-License-Identifier: CC0-1.0
+
+module t(/*AUTOARG*/
+   // Inputs
+   clk
+   );
+   input clk;
+
+   wire  o0, o1;
+
+   sub #(1) a(.i(1'b0), .o(o0));
+   sub #(2) b(.i(1'b0), .o(o1));
+
+   always @(posedge clk) begin
+      if (o0 != 1'b0) begin
+         $write("Bad o0\n");
+         $stop;
+      end
+      if (o1 != 1'b1) begin
+         $write("Bad o1\n");
+         $stop;
+      end
+      $write("*-* All Finished *-*\n");
+      $finish;
+   end
+
+endmodule
+
+module sub
+  #(
+    parameter int W
+    )
+   (
+    input wire  i,
+    output wire o
+    );
+
+   typedef struct packed {
+      logic [W-1:0] a;
+   } s;
+
+   sub2 #(s) c(.i(i), .o(o));
+
+endmodule
+
+module sub2
+  # (
+     parameter type T = logic
+     )
+   (
+    input wire  i,
+    output wire o
+    );
+
+   if ($bits(T) % 2 == 1) begin
+      assign o =  i;
+   end else begin
+      assign o =  ~i;
+   end
+
+endmodule
diff --git a/test_regress/t/t_param_type4_collision.pl b/test_regress/t/t_param_type4_collision.pl
new file mode 100755
index 000000000..c2b4251c7
--- /dev/null
+++ b/test_regress/t/t_param_type4_collision.pl
@@ -0,0 +1,24 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+top_filename("t/t_param_type4.v");
+
+compile(
+    verilator_flags2 => ["--debug-collision"]
+    );
+
+execute(
+    check_finished => 1,
+    );
+
+ok(1);
+1;

From d5c9369103d7c885e4bc1c4b89b9a53379b7a8be Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Thu, 1 Jul 2021 19:33:44 +0100
Subject: [PATCH 61/73] Internals: Fix suspicious dtype clone relinking.
 (#3056)

---
 src/V3Ast.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/V3Ast.cpp b/src/V3Ast.cpp
index 31f819c53..e4d36cb60 100644
--- a/src/V3Ast.cpp
+++ b/src/V3Ast.cpp
@@ -932,7 +932,9 @@ AstNode* AstNode::iterateSubtreeReturnEdits(AstNVisitor& v) {
 void AstNode::cloneRelinkTree() {
     // private: Cleanup clone() operation on whole tree. Publicly call cloneTree() instead.
     for (AstNode* nodep = this; nodep; nodep = nodep->m_nextp) {
-        if (m_dtypep && m_dtypep->clonep()) m_dtypep = m_dtypep->clonep();
+        if (nodep->m_dtypep && nodep->m_dtypep->clonep()) {
+            nodep->m_dtypep = nodep->m_dtypep->clonep();
+        }
         nodep->cloneRelink();
         if (nodep->m_op1p) nodep->m_op1p->cloneRelinkTree();
         if (nodep->m_op2p) nodep->m_op2p->cloneRelinkTree();

From d4e73e215ecc01b80258dc163c4a360e484564f4 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Thu, 1 Jul 2021 21:35:19 +0100
Subject: [PATCH 62/73] Tests: fail test if vcddiff aborts, fix failing tests

Tests used to silently pass when vcddiff aborted. Now fixed. Updated
large array trace reference files for FST, added same reference files
for VCD.

Developers need to update their local vcddiff.
---
 ci/ci-install.bash                        |  2 +-
 test_regress/driver.pl                    |  2 +-
 test_regress/t/t_trace_array.out          | 55 +++++++++++++++++++++++
 test_regress/t/t_trace_array.pl           |  2 +-
 test_regress/t/t_trace_array_fst.out      | 22 ++++-----
 test_regress/t/t_trace_array_threads_1.pl |  3 +-
 6 files changed, 72 insertions(+), 14 deletions(-)
 create mode 100644 test_regress/t/t_trace_array.out

diff --git a/ci/ci-install.bash b/ci/ci-install.bash
index c13328d0e..f258916b4 100755
--- a/ci/ci-install.bash
+++ b/ci/ci-install.bash
@@ -42,7 +42,7 @@ fi
 install-vcddiff() {
   TMP_DIR="$(mktemp -d)"
   git clone https://github.com/veripool/vcddiff "$TMP_DIR"
-  git -C "${TMP_DIR}" checkout 5112f88b7ba8818dce9dfb72619e64a1fc19542c
+  git -C "${TMP_DIR}" checkout e5664be5fe39d353bf3fcb50aa05214ab7ed4ac4
   "$MAKE" -C "${TMP_DIR}"
   sudo cp "${TMP_DIR}/vcddiff" /usr/local/bin
 }
diff --git a/test_regress/driver.pl b/test_regress/driver.pl
index 5164fcc2f..9c1a56408 100755
--- a/test_regress/driver.pl
+++ b/test_regress/driver.pl
@@ -2261,7 +2261,7 @@ sub vcd_identical {
         $cmd = qq{vcddiff "$fn1" "$fn2"};
         print "\t$cmd\n" if $::Debug;
         $out = `$cmd`;
-        if ($out ne '') {
+        if ($? != 0 || $out ne '') {
             print $out;
             $self->error("VCD miscompares $fn1 $fn2\n");
             $self->copy_if_golden($fn1, $fn2);
diff --git a/test_regress/t/t_trace_array.out b/test_regress/t/t_trace_array.out
new file mode 100644
index 000000000..4791912ee
--- /dev/null
+++ b/test_regress/t/t_trace_array.out
@@ -0,0 +1,55 @@
+$version Generated by VerilatedVcd $end
+$date Thu Jul  1 22:52:39 2021 $end
+$timescale 1ps $end
+
+ $scope module top $end
+  $var wire  1 ]b# clk $end
+  $scope module t $end
+   $var wire  1 ]b# clk $end
+   $var wire 32 # cyc [31:0] $end
+   $scope struct biggie $end
+    $var wire 1048577 $ d [1048576:0] $end
+   $upscope $end
+  $upscope $end
+ $upscope $end
+$enddefinitions $end
+
+
+#0
+b00000000000000000000000000000000 #
+b000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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$
+1]b#
diff --git a/test_regress/t/t_trace_array.pl b/test_regress/t/t_trace_array.pl
index 63bf5c2b6..ff327974a 100755
--- a/test_regress/t/t_trace_array.pl
+++ b/test_regress/t/t_trace_array.pl
@@ -18,7 +18,7 @@ execute(
     check_finished => 1,
     );
 
-file_grep("$Self->{obj_dir}/simx.vcd", qr/\$enddefinitions/x);
+vcd_identical($Self->trace_filename, $Self->{golden_filename});
 
 ok(1);
 1;
diff --git a/test_regress/t/t_trace_array_fst.out b/test_regress/t/t_trace_array_fst.out
index 9c1c6afd6..030701a44 100644
--- a/test_regress/t/t_trace_array_fst.out
+++ b/test_regress/t/t_trace_array_fst.out
@@ -1,5 +1,5 @@
 $date
-	Sun Apr 19 04:15:23 2020
+	Thu Jul  1 22:53:18 2021
 
 $end
 $version
@@ -19,41 +19,43 @@ $upscope $end
 $upscope $end
 $upscope $end
 $enddefinitions $end
+#0
 $dumpvars
-0!
-b00000000000000000000000000000000 "
 b000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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#
diff --git a/test_regress/t/t_trace_array_threads_1.pl b/test_regress/t/t_trace_array_threads_1.pl
index 618053e42..9f4332d28 100755
--- a/test_regress/t/t_trace_array_threads_1.pl
+++ b/test_regress/t/t_trace_array_threads_1.pl
@@ -11,6 +11,7 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 scenarios(vlt => 1);
 
 top_filename("t/t_trace_array.v");
+golden_filename("t/t_trace_array.out");
 
 compile(
     verilator_flags2 => ['--cc --trace --trace-threads 1 --trace-structs'],
@@ -20,7 +21,7 @@ execute(
     check_finished => 1,
     );
 
-file_grep("$Self->{obj_dir}/simx.vcd", qr/\$enddefinitions/x);
+vcd_identical($Self->trace_filename, $Self->{golden_filename});
 
 ok(1);
 1;

From fb56f4f88005d2bb97c7e31311f51420242e9bcb Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Thu, 1 Jul 2021 23:47:33 +0100
Subject: [PATCH 63/73] Tests: make t_prot_lib*.pl name mangling deterministic

This is to facilitate diffing generated files in tests.
---
 test_regress/t/t_prot_lib.pl           | 2 ++
 test_regress/t/t_prot_lib_clk_gated.pl | 2 ++
 test_regress/t/t_prot_lib_comb.pl      | 2 ++
 test_regress/t/t_prot_lib_inout_bad.pl | 5 ++++-
 test_regress/t/t_prot_lib_shared.pl    | 2 ++
 5 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/test_regress/t/t_prot_lib.pl b/test_regress/t/t_prot_lib.pl
index 7f2b9b352..22fb1c6d1 100755
--- a/test_regress/t/t_prot_lib.pl
+++ b/test_regress/t/t_prot_lib.pl
@@ -35,6 +35,8 @@ while (1) {
                 $secret_dir,
                 "--protect-lib",
                 $secret_prefix,
+                "--protect-key",
+                "secret-key",
                 "t/t_prot_lib_secret.v"],
         verilator_run => 1,
         );
diff --git a/test_regress/t/t_prot_lib_clk_gated.pl b/test_regress/t/t_prot_lib_clk_gated.pl
index 8bb14ba16..0f7fcd125 100755
--- a/test_regress/t/t_prot_lib_clk_gated.pl
+++ b/test_regress/t/t_prot_lib_clk_gated.pl
@@ -37,6 +37,8 @@ while (1) {
                 "-GGATED_CLK=1",
                 "--protect-lib",
                 $secret_prefix,
+                "--protect-key",
+                "secret-key",
                 "t/t_prot_lib_secret.v"],
         verilator_run => 1,
         );
diff --git a/test_regress/t/t_prot_lib_comb.pl b/test_regress/t/t_prot_lib_comb.pl
index 296873c8f..856e3ebd0 100755
--- a/test_regress/t/t_prot_lib_comb.pl
+++ b/test_regress/t/t_prot_lib_comb.pl
@@ -35,6 +35,8 @@ while (1) {
                 $secret_dir,
                 "--protect-lib",
                 $secret_prefix,
+                "--protect-key",
+                "secret-key",
                 "t/t_prot_lib_comb.v"],
         verilator_run => 1,
         );
diff --git a/test_regress/t/t_prot_lib_inout_bad.pl b/test_regress/t/t_prot_lib_inout_bad.pl
index 955f6793e..d3c7f81d2 100755
--- a/test_regress/t/t_prot_lib_inout_bad.pl
+++ b/test_regress/t/t_prot_lib_inout_bad.pl
@@ -12,7 +12,10 @@ scenarios(vlt => 1);
 
 compile (
     verilator_flags2 => ["--protect-lib",
-                         "secret"],
+                         "secret",
+                         "--protect-key",
+                         "secret-key"
+                       ],
     verilator_make_gcc => 0,
     fails => 1,
     expect_filename => $Self->{golden_filename},
diff --git a/test_regress/t/t_prot_lib_shared.pl b/test_regress/t/t_prot_lib_shared.pl
index a595a4866..91e2e5cc6 100755
--- a/test_regress/t/t_prot_lib_shared.pl
+++ b/test_regress/t/t_prot_lib_shared.pl
@@ -39,6 +39,8 @@ while (1) {
                 $secret_dir,
                 "--protect-lib",
                 $secret_prefix,
+                "--protect-key",
+                "secret-key",
                 "t/t_prot_lib_secret.v"],
         verilator_run => 1,
         );

From 2a7aa28b206a5d966b45f2c7fbb2488d35848766 Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Mon, 5 Jul 2021 15:37:20 +0100
Subject: [PATCH 64/73] V3Simulate/V3Table: change deques to vectors for
 performance

We can get away with only push_back and back on sequence containers, in
which case std::vector is significantly faster than std::deque.
---
 src/V3Simulate.h | 12 ++++++------
 src/V3Table.cpp  |  7 ++-----
 2 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/src/V3Simulate.h b/src/V3Simulate.h
index 7907b6bee..a1e1ff009 100644
--- a/src/V3Simulate.h
+++ b/src/V3Simulate.h
@@ -42,6 +42,7 @@
 
 #include <deque>
 #include <sstream>
+#include <vector>
 
 //============================================================================
 
@@ -104,12 +105,12 @@ private:
     // Simulating:
     ConstPile m_constFreeps;  ///< List of all AstConst* free and not in use
     ConstPile m_constAllps;  ///< List of all AstConst* free and in use
-    std::deque<SimStackNode*> m_callStack;  ///< Call stack for verbose error messages
+    std::vector<SimStackNode*> m_callStack;  ///< Call stack for verbose error messages
 
     // Cleanup
     // V3Numbers that represents strings are a bit special and the API for
     // V3Number does not allow changing them.
-    std::deque<AstNode*> m_reclaimValuesp;  // List of allocated string numbers
+    std::vector<AstNode*> m_reclaimValuesp;  // List of allocated string numbers
 
     // Note level 8&9 include debugging each simulation value
     VL_DEBUG_FUNC;  // Declare debug()
@@ -180,8 +181,7 @@ public:
             }
             m_whyNotOptimizable = why;
             std::ostringstream stack;
-            for (std::deque<SimStackNode*>::iterator it = m_callStack.begin();
-                 it != m_callStack.end(); ++it) {
+            for (auto it = m_callStack.rbegin(); it != m_callStack.rend(); ++it) {
                 AstFuncRef* funcp = (*it)->m_funcp;
                 stack << "\n        " << funcp->fileline() << "... Called from "
                       << funcp->prettyName() << "() with parameters:";
@@ -978,7 +978,7 @@ private:
             }
         }
         SimStackNode stackNode(nodep, &tconnects);
-        m_callStack.push_front(&stackNode);
+        m_callStack.push_back(&stackNode);
         // Clear output variable
         if (auto* const basicp = VN_CAST(funcp->fvarp(), Var)->basicp()) {
             AstConst cnst(funcp->fvarp()->fileline(), AstConst::WidthedValue(), basicp->widthMin(),
@@ -992,7 +992,7 @@ private:
         }
         // Evaluate the function
         iterate(funcp);
-        m_callStack.pop_front();
+        m_callStack.pop_back();
         if (!m_checkOnly && optimizable()) {
             // Grab return value from output variable (if it's a function)
             UASSERT_OBJ(funcp->fvarp(), nodep, "Function reference points at non-function");
diff --git a/src/V3Table.cpp b/src/V3Table.cpp
index d233cd60e..330873ced 100644
--- a/src/V3Table.cpp
+++ b/src/V3Table.cpp
@@ -31,7 +31,7 @@
 #include "V3Ast.h"
 
 #include <cmath>
-#include <deque>
+#include <vector>
 
 //######################################################################
 // Table class functions
@@ -156,7 +156,6 @@ private:
     //  State cleared on each module
     AstNodeModule* m_modp = nullptr;  // Current MODULE
     int m_modTables = 0;  // Number of tables created in this module
-    std::deque<AstVarScope*> m_modTableVscs;  // All tables created
 
     //  State cleared on each scope
     AstScope* m_scopep = nullptr;  // Current SCOPE
@@ -165,7 +164,7 @@ private:
     bool m_assignDly = false;  // Consists of delayed assignments instead of normal assignments
     unsigned m_inWidthBits = 0;  // Input table width - in bits
     unsigned m_outWidthBytes = 0;  // Output table width - in bytes
-    std::deque<AstVarScope*> m_inVarps;  // Input variable list
+    std::vector<AstVarScope*> m_inVarps;  // Input variable list
     std::vector<TableOutputVar> m_outVarps;  // Output variable list
 
     // METHODS
@@ -380,11 +379,9 @@ private:
     virtual void visit(AstNodeModule* nodep) override {
         VL_RESTORER(m_modp);
         VL_RESTORER(m_modTables);
-        VL_RESTORER(m_modTableVscs);
         {
             m_modp = nodep;
             m_modTables = 0;
-            m_modTableVscs.clear();
             iterateChildren(nodep);
         }
     }

From 2ebed755e6cad24746fa747f994f31a32d1fc41f Mon Sep 17 00:00:00 2001
From: Geza Lore <gezalore@gmail.com>
Date: Mon, 5 Jul 2021 16:35:24 +0100
Subject: [PATCH 65/73] V3Simulate: Avoid copying while managing free list.

V3Simulate reuses allocated AstConst nodes for efficiency, however this
used to be implemented in a way that required a deep copy of a
std::unorderd_map<_, std::deque<_>>, which was quite inefficient when it
grew large. The free list is now managed without any copying. This takes
the V3Table pass from taking 12s to 0.2s on SweRV EH1.
---
 Changes          |  1 +
 src/V3Simulate.h | 53 ++++++++++++++++++++++++++++--------------------
 2 files changed, 32 insertions(+), 22 deletions(-)

diff --git a/Changes b/Changes
index 8abc9d626..bf318e915 100644
--- a/Changes
+++ b/Changes
@@ -32,6 +32,7 @@ Verilator 4.205 devel
 * In XML, show pinIndex information (#2877). [errae233]
 * Fix error on unsupported recursive functions (#2957). [Trefor Southwell]
 * Fix type parameter specialization when struct names are same (#3055). [7FM]
+* Improve speed of table optimization (-OA) pass. [Geza Lore]
 
 
 Verilator 4.204 2021-06-12
diff --git a/src/V3Simulate.h b/src/V3Simulate.h
index a1e1ff009..4fe3444ab 100644
--- a/src/V3Simulate.h
+++ b/src/V3Simulate.h
@@ -61,9 +61,6 @@ public:
     ~SimStackNode() = default;
 };
 
-using ConstDeque = std::deque<AstConst*>;
-using ConstPile = std::unordered_map<const AstNodeDType*, ConstDeque>;
-
 class SimulateVisitor VL_NOT_FINAL : public AstNVisitor {
     // Simulate a node tree, returning value of variables
     // Two major operating modes:
@@ -82,6 +79,7 @@ private:
     // Checking:
     //  AstVar(Scope)::user1()  -> VarUsage.  Set true to indicate tracking as lvalue/rvalue
     // Simulating:
+    //  AstConst::user2()       -> bool. This AstConst (allocated by this class) is in use
     //  AstVar(Scope)::user3()  -> AstConst*. Input value of variable or node
     //    (and output for non-delayed assignments)
     //  AstVar(Scope)::user2()  -> AstCont*. Output value of variable (delayed assignments)
@@ -103,8 +101,8 @@ private:
     int m_dataCount;  ///< Bytes of data
     AstJumpGo* m_jumpp;  ///< Jump label we're branching from
     // Simulating:
-    ConstPile m_constFreeps;  ///< List of all AstConst* free and not in use
-    ConstPile m_constAllps;  ///< List of all AstConst* free and in use
+    std::unordered_map<const AstNodeDType*, std::deque<AstConst*>>
+        m_constps;  ///< Lists of all AstConst* allocated per dtype
     std::vector<SimStackNode*> m_callStack;  ///< Call stack for verbose error messages
 
     // Cleanup
@@ -214,16 +212,31 @@ private:
         // It would be more efficient to do this by size, but the extra accounting
         // slows things down more than we gain.
         AstConst* constp;
-        AstNodeDType* dtypep = nodep->dtypep();
-        if (!m_constFreeps[dtypep].empty()) {
-            // UINFO(7, "Num Reuse " << nodep->width() << endl);
-            constp = m_constFreeps[dtypep].back();
-            m_constFreeps[dtypep].pop_back();
-            constp->num().nodep(nodep);
-        } else {
-            // UINFO(7, "Num New " << nodep->width() << endl);
+        // Grab free list corresponding to this dtype
+        std::deque<AstConst*>& freeList = m_constps[nodep->dtypep()];
+        bool allocNewConst = true;
+        if (!freeList.empty()) {
+            constp = freeList.front();
+            if (!constp->user2()) {
+                // Front of free list is free, reuse it (otherwise allocate new node)
+                allocNewConst = false;  // No need to allocate
+                // Mark the AstConst node as used, and move it to the back of the free list. This
+                // ensures that when all AstConst instances within the list are used, then the
+                // front of the list will be marked as used, in which case the enclosing 'if' will
+                // fail and we fall back to allocation.
+                constp->user2(1);
+                freeList.pop_front();
+                freeList.push_back(constp);
+                // configure const
+                constp->num().nodep(nodep);
+            }
+        }
+        if (allocNewConst) {
+            // Need to allocate new constant
             constp = new AstConst(nodep->fileline(), AstConst::DtypedValue(), nodep->dtypep(), 0);
-            m_constAllps[constp->dtypep()].push_back(constp);
+            // Mark as in use, add to free list for later reuse
+            constp->user2(1);
+            freeList.push_back(constp);
         }
         constp->num().isDouble(nodep->isDouble());
         constp->num().isString(nodep->isString());
@@ -1122,11 +1135,8 @@ public:
         m_jumpp = nullptr;
 
         AstNode::user1ClearTree();
-        AstNode::user2ClearTree();
+        AstNode::user2ClearTree();  // Also marks all elements in m_constps as free
         AstNode::user3ClearTree();
-
-        // Move all allocated numbers to the free pool
-        m_constFreeps = m_constAllps;
     }
     void mainTableCheck(AstNode* nodep) {
         setMode(true /*scoped*/, true /*checking*/, false /*params*/);
@@ -1145,13 +1155,12 @@ public:
         mainGuts(nodep);
     }
     virtual ~SimulateVisitor() override {
-        for (const auto& i : m_constAllps) {
-            for (AstConst* i2p : i.second) delete i2p;
+        for (const auto& pair : m_constps) {
+            for (AstConst* const constp : pair.second) { delete constp; }
         }
+        m_constps.clear();
         for (AstNode* ip : m_reclaimValuesp) delete ip;
         m_reclaimValuesp.clear();
-        m_constFreeps.clear();
-        m_constAllps.clear();
     }
 };
 

From fd0446f4814351bde6ba10eb3652c24ce99a80b1 Mon Sep 17 00:00:00 2001
From: Morten Borup Petersen <morten_bp@live.dk>
Date: Tue, 6 Jul 2021 13:06:00 +0200
Subject: [PATCH 66/73] Internals: Add .dot graph visualization of
 ThreadSchedule (#3048)

* Move MTaskState to ThreadSchedule

MTaskState does not concern itself with sandbagging, and thus solely contains information related to the finalized schedule, i.e., completion time, thread ID and next MTask on thread.

* Add .dot graph visualization of ThreadSchedule

Follow-up to #2779.

This commit adds the creation of .dot files - used by GraphViz - to visualize how mtasks are statically scheduled across the set of specified threads.
We visualize each thread as a row, with nodes of a row being the mtasks scheduled for the given thread. The width of the mtask nodes are proportional to their cost. MTask dependencies are shown using an edge between the source and sink mtasks.
---
 src/V3Partition.cpp          | 181 ++++++++++++++++++++++++++---------
 test_regress/t/t_dotfiles.pl |  36 +++++++
 2 files changed, 173 insertions(+), 44 deletions(-)
 create mode 100755 test_regress/t/t_dotfiles.pl

diff --git a/src/V3Partition.cpp b/src/V3Partition.cpp
index f63124957..0bff6bde5 100644
--- a/src/V3Partition.cpp
+++ b/src/V3Partition.cpp
@@ -2010,12 +2010,32 @@ class PartPackMTasks;
 // (attributes).
 class ThreadSchedule final {
 public:
+    // CONSTANTS
+    static constexpr uint32_t UNASSIGNED = 0xffffffff;
+
+    // TYPES
+    struct MTaskState {
+        uint32_t completionTime = 0;  // Estimated time this mtask will complete
+        uint32_t threadId = UNASSIGNED;  // Thread id this MTask is assigned to
+        const ExecMTask* nextp = nullptr;  // Next MTask on same thread after this
+    };
+
+    // MEMBERS
     // Allocation of sequence of MTasks to threads. Can be considered a map from thread ID to
     // the sequence of MTasks to be executed by that thread.
     std::vector<std::vector<const ExecMTask*>> threads;
 
-    // Map from MTask to ID of thread it is assigned to.
-    std::unordered_map<const ExecMTask*, uint32_t> threadId;
+    // State for each mtask.
+    std::unordered_map<const ExecMTask*, MTaskState> mtaskState;
+
+    uint32_t threadId(const ExecMTask* mtaskp) const {
+        const auto& it = mtaskState.find(mtaskp);
+        if (it != mtaskState.end()) {
+            return it->second.threadId;
+        } else {
+            return UNASSIGNED;
+        }
+    }
 
 private:
     friend class PartPackMTasks;
@@ -2026,20 +2046,104 @@ private:
     ThreadSchedule(ThreadSchedule&&) = default;
     ThreadSchedule& operator=(ThreadSchedule&&) = default;
 
+    // Debugging
+    void dumpDotFile(const string& filename) const;
+    void dumpDotFilePrefixedAlways(const string& nameComment) const;
+
 public:
     // Returns the number of cross-thread dependencies of the given MTask. If > 0, the MTask must
     // test whether its dependencies are ready before starting, and therefore may need to block.
     uint32_t crossThreadDependencies(const ExecMTask* mtaskp) const {
-        const uint32_t thisThreadId = threadId.at(mtaskp);
+        const uint32_t thisThreadId = threadId(mtaskp);
         uint32_t result = 0;
         for (V3GraphEdge* edgep = mtaskp->inBeginp(); edgep; edgep = edgep->inNextp()) {
             const ExecMTask* const prevp = dynamic_cast<ExecMTask*>(edgep->fromp());
-            if (threadId.at(prevp) != thisThreadId) ++result;
+            if (threadId(prevp) != thisThreadId) ++result;
         }
         return result;
     }
+
+    uint32_t startTime(const ExecMTask* mtaskp) const {
+        return mtaskState.at(mtaskp).completionTime - mtaskp->cost();
+    }
+    uint32_t endTime(const ExecMTask* mtaskp) const {
+        return mtaskState.at(mtaskp).completionTime;
+    }
 };
 
+//! Variant of dumpDotFilePrefixed without --dump option check
+void ThreadSchedule::dumpDotFilePrefixedAlways(const string& nameComment) const {
+    dumpDotFile(v3Global.debugFilename(nameComment) + ".dot");
+}
+
+void ThreadSchedule::dumpDotFile(const string& filename) const {
+    // This generates a file used by graphviz, https://www.graphviz.org
+    const std::unique_ptr<std::ofstream> logp(V3File::new_ofstream(filename));
+    if (logp->fail()) v3fatal("Can't write " << filename);
+    auto* depGraph = v3Global.rootp()->execGraphp()->depGraphp();
+
+    // Header
+    *logp << "digraph v3graph {\n";
+    *logp << "  graph[layout=\"neato\" labelloc=t labeljust=l label=\"" << filename << "\"]\n";
+    *logp << "  node[shape=\"rect\" ratio=\"fill\" fixedsize=true]\n";
+
+    // Thread labels
+    *logp << "\n  // Threads\n";
+    const int threadBoxWidth = 2;
+    for (int i = 0; i < v3Global.opt.threads(); i++) {
+        *logp << "  t" << i << " [label=\"Thread " << i << "\" width=" << threadBoxWidth
+              << " pos=\"" << (-threadBoxWidth / 2) << "," << -i
+              << "!\" style=\"filled\" fillcolor=\"grey\"] \n";
+    }
+
+    // MTask nodes
+    *logp << "\n  // MTasks\n";
+
+    // Find minimum cost MTask for scaling MTask node widths
+    uint32_t minCost = UINT32_MAX;
+    for (const V3GraphVertex* vxp = depGraph->verticesBeginp(); vxp; vxp = vxp->verticesNextp()) {
+        if (const ExecMTask* mtaskp = dynamic_cast<const ExecMTask*>(vxp)) {
+            minCost = minCost > mtaskp->cost() ? mtaskp->cost() : minCost;
+        }
+    }
+    const double minWidth = 2.0;
+    auto mtaskXPos = [&](const ExecMTask* mtaskp, const double nodeWidth) {
+        const double startPosX = (minWidth * startTime(mtaskp)) / minCost;
+        return nodeWidth / minWidth + startPosX;
+    };
+
+    auto emitMTask = [&](const ExecMTask* mtaskp) {
+        const int thread = threadId(mtaskp);
+        const double nodeWidth = minWidth * (static_cast<double>(mtaskp->cost()) / minCost);
+        const double x = mtaskXPos(mtaskp, nodeWidth);
+        const int y = -thread;
+        string label = "label=\"" + mtaskp->name() + " (" + cvtToStr(startTime(mtaskp)) + ":"
+                       + std::to_string(endTime(mtaskp)) + ")" + "\"";
+        *logp << "  " << mtaskp->name() << " [" << label << " width=" << nodeWidth << " pos=\""
+              << x << "," << y << "!\"]\n";
+    };
+
+    // Emit MTasks
+    for (const V3GraphVertex* vxp = depGraph->verticesBeginp(); vxp; vxp = vxp->verticesNextp()) {
+        if (const ExecMTask* mtaskp = dynamic_cast<const ExecMTask*>(vxp)) { emitMTask(mtaskp); }
+    }
+
+    // Emit MTask dependency edges
+    *logp << "\n  // MTask dependencies\n";
+    for (const V3GraphVertex* vxp = depGraph->verticesBeginp(); vxp; vxp = vxp->verticesNextp()) {
+        if (const ExecMTask* mtaskp = dynamic_cast<const ExecMTask*>(vxp)) {
+            for (V3GraphEdge* edgep = mtaskp->outBeginp(); edgep; edgep = edgep->outNextp()) {
+                const V3GraphVertex* top = edgep->top();
+                *logp << "  " << vxp->name() << " -> " << top->name() << "\n";
+            }
+        }
+    }
+
+    // Trailer
+    *logp << "}\n";
+    logp->close();
+}
+
 //######################################################################
 // PartPackMTasks
 
@@ -2059,16 +2163,7 @@ public:
 // thread A checks the end time of an mtask running on thread B. This extra
 // "padding" avoids tight "layovers" at cross-thread dependencies.
 class PartPackMTasks final {
-    // CONSTANTS
-    static constexpr uint32_t UNASSIGNED = 0xffffffff;
-
     // TYPES
-    struct MTaskState {
-        uint32_t completionTime = 0;  // Estimated time this mtask will complete
-        uint32_t threadId = UNASSIGNED;  // Thread id this MTask is assigned to
-        const ExecMTask* nextp = nullptr;  // Next MTask on same thread after this
-    };
-
     struct MTaskCmp {
         bool operator()(const ExecMTask* ap, const ExecMTask* bp) const {
             return ap->id() < bp->id();
@@ -2080,8 +2175,6 @@ class PartPackMTasks final {
     const uint32_t m_sandbagNumerator;  // Numerator padding for est runtime
     const uint32_t m_sandbagDenom;  // Denominator padding for est runtime
 
-    std::unordered_map<const ExecMTask*, MTaskState> m_mtaskState;  // State for each mtask.
-
 public:
     // CONSTRUCTORS
     explicit PartPackMTasks(uint32_t nThreads = v3Global.opt.threads(),
@@ -2093,9 +2186,10 @@ public:
 
 private:
     // METHODS
-    uint32_t completionTime(const ExecMTask* mtaskp, uint32_t threadId) {
-        const MTaskState& state = m_mtaskState[mtaskp];
-        UASSERT(state.threadId != UNASSIGNED, "Mtask should have assigned thread");
+    uint32_t completionTime(const ThreadSchedule& schedule, const ExecMTask* mtaskp,
+                            uint32_t threadId) {
+        const ThreadSchedule::MTaskState& state = schedule.mtaskState.at(mtaskp);
+        UASSERT(state.threadId != ThreadSchedule::UNASSIGNED, "Mtask should have assigned thread");
         if (threadId == state.threadId) {
             // No overhead on same thread
             return state.completionTime;
@@ -2111,7 +2205,8 @@ private:
         // finishes, otherwise we get priority inversions and fail the self
         // test.
         if (state.nextp) {
-            const uint32_t successorEndTime = completionTime(state.nextp, state.threadId);
+            const uint32_t successorEndTime
+                = completionTime(schedule, state.nextp, state.threadId);
             if ((sandbaggedEndTime >= successorEndTime) && (successorEndTime > 1)) {
                 sandbaggedEndTime = successorEndTime - 1;
             }
@@ -2122,10 +2217,10 @@ private:
         return sandbaggedEndTime;
     }
 
-    bool isReady(const ExecMTask* mtaskp) {
+    bool isReady(ThreadSchedule& schedule, const ExecMTask* mtaskp) {
         for (V3GraphEdge* edgeInp = mtaskp->inBeginp(); edgeInp; edgeInp = edgeInp->inNextp()) {
             const ExecMTask* const prevp = dynamic_cast<ExecMTask*>(edgeInp->fromp());
-            if (m_mtaskState[prevp].threadId == UNASSIGNED) {
+            if (schedule.threadId(prevp) == ThreadSchedule::UNASSIGNED) {
                 // This predecessor is not assigned yet
                 return false;
             }
@@ -2148,12 +2243,9 @@ public:
         // Build initial ready list
         for (V3GraphVertex* vxp = mtaskGraph.verticesBeginp(); vxp; vxp = vxp->verticesNextp()) {
             const ExecMTask* const mtaskp = dynamic_cast<ExecMTask*>(vxp);
-            if (isReady(mtaskp)) readyMTasks.insert(mtaskp);
+            if (isReady(schedule, mtaskp)) readyMTasks.insert(mtaskp);
         }
 
-        // Clear algorithm state
-        m_mtaskState.clear();
-
         while (!readyMTasks.empty()) {
             // For each task in the ready set, compute when it might start
             // on each thread (in that thread's local time frame.)
@@ -2172,7 +2264,7 @@ public:
                     for (V3GraphEdge* edgep = mtaskp->inBeginp(); edgep;
                          edgep = edgep->inNextp()) {
                         const ExecMTask* const priorp = dynamic_cast<ExecMTask*>(edgep->fromp());
-                        const uint32_t priorEndTime = completionTime(priorp, threadId);
+                        const uint32_t priorEndTime = completionTime(schedule, priorp, threadId);
                         if (priorEndTime > timeBegin) timeBegin = priorEndTime;
                     }
                     UINFO(6, "Task " << mtaskp->name() << " start at " << timeBegin
@@ -2197,14 +2289,13 @@ public:
 
             // Update algorithm state
             const uint32_t bestEndTime = bestTime + bestMtaskp->cost();
-            m_mtaskState[bestMtaskp].completionTime = bestEndTime;
-            m_mtaskState[bestMtaskp].threadId = bestThreadId;
-            if (!bestThread.empty()) { m_mtaskState[bestThread.back()].nextp = bestMtaskp; }
+            schedule.mtaskState[bestMtaskp].completionTime = bestEndTime;
+            schedule.mtaskState[bestMtaskp].threadId = bestThreadId;
+            if (!bestThread.empty()) { schedule.mtaskState[bestThread.back()].nextp = bestMtaskp; }
             busyUntil[bestThreadId] = bestEndTime;
 
             // Add the MTask to the schedule
             bestThread.push_back(bestMtaskp);
-            schedule.threadId[bestMtaskp] = bestThreadId;
 
             // Update the ready list
             const size_t erased = readyMTasks.erase(bestMtaskp);
@@ -2213,18 +2304,20 @@ public:
                  edgeOutp = edgeOutp->outNextp()) {
                 const ExecMTask* const nextp = dynamic_cast<ExecMTask*>(edgeOutp->top());
                 // Dependent MTask should not yet be assigned to a thread
-                UASSERT(m_mtaskState[nextp].threadId == UNASSIGNED,
+                UASSERT(schedule.threadId(nextp) == ThreadSchedule::UNASSIGNED,
                         "Tasks after one being assigned should not be assigned yet");
                 // Dependent MTask should not be ready yet, since dependency is just being assigned
                 UASSERT_OBJ(readyMTasks.find(nextp) == readyMTasks.end(), nextp,
                             "Tasks after one being assigned should not be ready");
-                if (isReady(nextp)) {
+                if (isReady(schedule, nextp)) {
                     readyMTasks.insert(nextp);
                     UINFO(6, "Inserted " << nextp->name() << " into ready\n");
                 }
             }
         }
 
+        if (debug() >= 4) schedule.dumpDotFilePrefixedAlways("schedule");
+
         return schedule;
     }
 
@@ -2258,26 +2351,26 @@ public:
         UASSERT_SELFTEST(const ExecMTask*, schedule.threads[0][1], t1);
         UASSERT_SELFTEST(const ExecMTask*, schedule.threads[1][0], t2);
 
-        UASSERT_SELFTEST(size_t, schedule.threadId.size(), 3);
+        UASSERT_SELFTEST(size_t, schedule.mtaskState.size(), 3);
 
-        UASSERT_SELFTEST(uint32_t, schedule.threadId.at(t0), 0);
-        UASSERT_SELFTEST(uint32_t, schedule.threadId.at(t1), 0);
-        UASSERT_SELFTEST(uint32_t, schedule.threadId.at(t2), 1);
+        UASSERT_SELFTEST(uint32_t, schedule.threadId(t0), 0);
+        UASSERT_SELFTEST(uint32_t, schedule.threadId(t1), 0);
+        UASSERT_SELFTEST(uint32_t, schedule.threadId(t2), 1);
 
         // On its native thread, we see the actual end time for t0:
-        UASSERT_SELFTEST(uint32_t, packer.completionTime(t0, 0), 1000);
+        UASSERT_SELFTEST(uint32_t, packer.completionTime(schedule, t0, 0), 1000);
         // On the other thread, we see a sandbagged end time which does not
         // exceed the t1 end time:
-        UASSERT_SELFTEST(uint32_t, packer.completionTime(t0, 1), 1099);
+        UASSERT_SELFTEST(uint32_t, packer.completionTime(schedule, t0, 1), 1099);
 
         // Actual end time on native thread:
-        UASSERT_SELFTEST(uint32_t, packer.completionTime(t1, 0), 1100);
+        UASSERT_SELFTEST(uint32_t, packer.completionTime(schedule, t1, 0), 1100);
         // Sandbagged end time seen on thread 1.  Note it does not compound
         // with t0's sandbagged time; compounding caused trouble in
         // practice.
-        UASSERT_SELFTEST(uint32_t, packer.completionTime(t1, 1), 1130);
-        UASSERT_SELFTEST(uint32_t, packer.completionTime(t2, 0), 1229);
-        UASSERT_SELFTEST(uint32_t, packer.completionTime(t2, 1), 1199);
+        UASSERT_SELFTEST(uint32_t, packer.completionTime(schedule, t1, 1), 1130);
+        UASSERT_SELFTEST(uint32_t, packer.completionTime(schedule, t2, 0), 1229);
+        UASSERT_SELFTEST(uint32_t, packer.completionTime(schedule, t2, 1), 1199);
     }
 
 private:
@@ -2645,7 +2738,7 @@ static void addMTaskToFunction(const ThreadSchedule& schedule, const uint32_t th
     // For any dependent mtask that's on another thread, signal one dependency completion.
     for (V3GraphEdge* edgep = mtaskp->outBeginp(); edgep; edgep = edgep->outNextp()) {
         const ExecMTask* const nextp = dynamic_cast<ExecMTask*>(edgep->top());
-        if (schedule.threadId.at(nextp) != threadId) {
+        if (schedule.threadId(nextp) != threadId) {
             addStrStmt("vlSelf->__Vm_mtaskstate_" + cvtToStr(nextp->id())
                        + ".signalUpstreamDone(even_cycle);\n");
         }
@@ -2661,7 +2754,7 @@ static const std::vector<AstCFunc*> createThreadFunctions(const ThreadSchedule&
     // For each thread, create a function representing its entry point
     for (const std::vector<const ExecMTask*>& thread : schedule.threads) {
         if (thread.empty()) continue;
-        const uint32_t threadId = schedule.threadId.at(thread.front());
+        const uint32_t threadId = schedule.threadId(thread.front());
         string name = "__Vthread_";
         name += cvtToStr(threadId);
         AstCFunc* const funcp = new AstCFunc(fl, name, nullptr, "void");
diff --git a/test_regress/t/t_dotfiles.pl b/test_regress/t/t_dotfiles.pl
new file mode 100755
index 000000000..31b8ac837
--- /dev/null
+++ b/test_regress/t/t_dotfiles.pl
@@ -0,0 +1,36 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2021 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(vltmt => 1);
+
+# Use a top file which we are sure to be parallelizable
+top_filename("t/t_gen_alw.v");
+
+compile(
+    v_flags2 => ["--debug --debugi 5 --threads 2"]
+    );
+
+foreach my $dotname ("linkcells", "task_call", "gate_simp", "gate_opt",
+        "acyc_simp", "orderg_pre", "orderg_acyc", "orderg_order", "orderg_domain",
+        "ordermv_initial", "ordermv_hazards", "ordermv_contraction",
+        "ordermv_transitive1", "orderg_done", "ordermv_transitive2", "schedule") {
+    # Some files with identical prefix are generated multiple times during
+    # verilation. Ensure that at least one of each $dotname-prefixed file is generated.
+    @dotFiles = glob("$Self->{obj_dir}/*$dotname.dot");
+    if (scalar @dotFiles == 0) {
+        error("Found no dotfiles with pattern *$dotname.dot");
+    }
+    foreach my $dotFilename (@dotFiles) {
+        file_grep($dotFilename, qr/digraph v3graph/);
+    }
+}
+
+ok(1);
+1;

From c5c5f11e1641bbfb28a7a8dfb1f426e92d100b70 Mon Sep 17 00:00:00 2001
From: Dan Petrisko <petrisko@cs.washington.edu>
Date: Wed, 7 Jul 2021 11:00:17 -0700
Subject: [PATCH 67/73] Tests: Adding failing test case for source synchronous
 signals (#3038)

---
 test_regress/t/t_source_sync.out |  7 +++++++
 test_regress/t/t_source_sync.pl  | 19 +++++++++++++++++++
 test_regress/t/t_source_sync.v   | 12 ++++++++++++
 3 files changed, 38 insertions(+)
 create mode 100644 test_regress/t/t_source_sync.out
 create mode 100755 test_regress/t/t_source_sync.pl
 create mode 100644 test_regress/t/t_source_sync.v

diff --git a/test_regress/t/t_source_sync.out b/test_regress/t/t_source_sync.out
new file mode 100644
index 000000000..92dd48e27
--- /dev/null
+++ b/test_regress/t/t_source_sync.out
@@ -0,0 +1,7 @@
+%Error: t/t_source_sync.v:8:14: syntax error, unexpected /*verilator clocker*/, expecting ',' or ';'
+    8 |    logic clk /*verilator clocker*/ ;
+      |              ^~~~~~~~~~~~~~~~~~~~~
+%Error: t/t_source_sync.v:10:1: syntax error, unexpected '}'
+   10 | } ss_s;
+      | ^
+%Error: Exiting due to
diff --git a/test_regress/t/t_source_sync.pl b/test_regress/t/t_source_sync.pl
new file mode 100755
index 000000000..f34ef865a
--- /dev/null
+++ b/test_regress/t/t_source_sync.pl
@@ -0,0 +1,19 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2019 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(vlt => 1);
+
+compile(
+    fails => 1,
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_source_sync.v b/test_regress/t/t_source_sync.v
new file mode 100644
index 000000000..2ca3a7282
--- /dev/null
+++ b/test_regress/t/t_source_sync.v
@@ -0,0 +1,12 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2020 by Dan Petrisko.
+// SPDX-License-Identifier: CC0-1.0
+
+typedef struct packed {
+   logic clk /*verilator clocker*/;
+   logic data;
+} ss_s;
+
+endmodule

From 8c705ee145c37f646a513b4e1a234c37d3f44108 Mon Sep 17 00:00:00 2001
From: Dan Petrisko <petrisko@cs.washington.edu>
Date: Wed, 7 Jul 2021 12:00:29 -0700
Subject: [PATCH 68/73] Support middle-of-design nested topmodules (#3026)

---
 src/V3LinkCells.cpp                           | 21 ++-------
 test_regress/t/t_flag_topmod2_bad.out         |  2 -
 test_regress/t/t_flag_topmod2_bad.v           | 32 --------------
 ...flag_topmod2_bad.pl => t_mod_topmodule.pl} | 14 +++---
 test_regress/t/t_mod_topmodule.v              | 34 +++++++++++++++
 test_regress/t/t_mod_topmodule_nest.pl        | 22 ++++++++++
 test_regress/t/t_mod_topmodule_nest.v         | 43 +++++++++++++++++++
 7 files changed, 111 insertions(+), 57 deletions(-)
 delete mode 100644 test_regress/t/t_flag_topmod2_bad.out
 delete mode 100644 test_regress/t/t_flag_topmod2_bad.v
 rename test_regress/t/{t_flag_topmod2_bad.pl => t_mod_topmodule.pl} (68%)
 create mode 100644 test_regress/t/t_mod_topmodule.v
 create mode 100755 test_regress/t/t_mod_topmodule_nest.pl
 create mode 100644 test_regress/t/t_mod_topmodule_nest.v

diff --git a/src/V3LinkCells.cpp b/src/V3LinkCells.cpp
index ef6804da0..0713c4d70 100644
--- a/src/V3LinkCells.cpp
+++ b/src/V3LinkCells.cpp
@@ -173,19 +173,6 @@ private:
                 // +1 so we leave level 1  for the new wrapper we'll make in a moment
                 AstNodeModule* modp = vvertexp->modp();
                 modp->level(vvertexp->rank() + 1);
-                if (vvertexp == m_topVertexp && modp->level() != 2) {
-                    AstNodeModule* abovep = nullptr;
-                    if (V3GraphEdge* edgep = vvertexp->inBeginp()) {
-                        if (LinkCellsVertex* eFromVertexp
-                            = dynamic_cast<LinkCellsVertex*>(edgep->fromp())) {
-                            abovep = eFromVertexp->modp();
-                        }
-                    }
-                    v3error("Specified --top-module '"
-                            << v3Global.opt.topModule()
-                            << "' isn't at the top level, it's under another instance '"
-                            << (abovep ? abovep->prettyName() : "UNKNOWN") << "'");
-                }
             }
         }
         if (v3Global.opt.topModule() != "" && !m_topVertexp) {
@@ -291,12 +278,12 @@ private:
         // m_mod, if 0 never did it, if !=, it is an unprocessed clone
         const bool cloned = (nodep->user1p() && nodep->user1p() != m_modp);
         if (nodep->user1p() == m_modp) return;  // AstBind and AstNodeModule may call a cell twice
-        if (v3Global.opt.hierChild() && nodep->modName() == m_origTopModuleName) {
-            if (nodep->modName() == m_modp->origName()) {
-                // Only the root of the recursive instantiation can be a hierarhcical block.
+        if (nodep->modName() == m_origTopModuleName) {
+            if (v3Global.opt.hierChild() && nodep->modName() == m_modp->origName()) {
+                // Only the root of the recursive instantiation can be a hierarchical block.
                 nodep->modName(m_modp->name());
             } else {
-                // In hierarchical mode, non-top module can be the top module of this run
+                // non-top module will be the top module of this run
                 VL_DO_DANGLING(pushDeletep(nodep->unlinkFrBack()), nodep);
                 return;
             }
diff --git a/test_regress/t/t_flag_topmod2_bad.out b/test_regress/t/t_flag_topmod2_bad.out
deleted file mode 100644
index a3680a2c6..000000000
--- a/test_regress/t/t_flag_topmod2_bad.out
+++ /dev/null
@@ -1,2 +0,0 @@
-%Error: Specified --top-module 'a' isn't at the top level, it's under another instance 'a_top'
-%Error: Exiting due to
diff --git a/test_regress/t/t_flag_topmod2_bad.v b/test_regress/t/t_flag_topmod2_bad.v
deleted file mode 100644
index 3d19fd0f5..000000000
--- a/test_regress/t/t_flag_topmod2_bad.v
+++ /dev/null
@@ -1,32 +0,0 @@
-// DESCRIPTION: Verilator: Verilog Test module
-//
-// This file ONLY is placed under the Creative Commons Public Domain, for
-// any use, without warranty, 2008 by Wilson Snyder.
-// SPDX-License-Identifier: CC0-1.0
-
-module a_top;
-   a a ();
-   initial begin
-      $write("Bad top modules\n");
-      $stop;
-   end
-endmodule
-
-module a;
-   b b ();
-   c c ();
-   d d ();
-endmodule
-
-module b;
-endmodule
-
-module c;
-endmodule
-
-module d;
-   initial begin
-      $write("*-* All Finished *-*\n");
-      $finish;
-   end
-endmodule
diff --git a/test_regress/t/t_flag_topmod2_bad.pl b/test_regress/t/t_mod_topmodule.pl
similarity index 68%
rename from test_regress/t/t_flag_topmod2_bad.pl
rename to test_regress/t/t_mod_topmodule.pl
index 8835ebd9c..914a14238 100755
--- a/test_regress/t/t_flag_topmod2_bad.pl
+++ b/test_regress/t/t_mod_topmodule.pl
@@ -2,18 +2,20 @@
 if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
 # DESCRIPTION: Verilator: Verilog Test driver/expect definition
 #
-# Copyright 2008 by Wilson Snyder. This program is free software; you
+# Copyright 2021 by Wilson Snyder. This program is free software; you
 # can redistribute it and/or modify it under the terms of either the GNU
 # Lesser General Public License Version 3 or the Perl Artistic License
 # Version 2.0.
 # SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
-scenarios(vlt => 1);
+scenarios(simulator => 1);
 
-lint(
-    v_flags2 => ["--top-module a "],
-    fails => 1,
-    expect_filename => $Self->{golden_filename},
+compile(
+    verilator_flags2 => ["--top-module top"]
+    );
+
+execute(
+    check_finished => 1,
     );
 
 ok(1);
diff --git a/test_regress/t/t_mod_topmodule.v b/test_regress/t/t_mod_topmodule.v
new file mode 100644
index 000000000..05d4c3ffa
--- /dev/null
+++ b/test_regress/t/t_mod_topmodule.v
@@ -0,0 +1,34 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This test verifies that a top-module can be specified which
+// is instantiated beneath another module in the compiled source
+// code.
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2021 by Dan Petrisko
+// SPDX-License-Identifier: CC0-1.0
+
+module top(/*AUTOARG*/
+   // Inputs
+   clk
+   );
+   input clk;
+
+   always_ff @(posedge clk) begin
+      $write("*-* All Finished *-*\n");
+      $finish();
+   end
+
+endmodule
+
+module faketop(/*AUTOARG*/
+   );
+
+   top top();
+
+   // Stop immediately if this module is instantiated
+  initial begin
+    $stop();
+   end
+
+endmodule
diff --git a/test_regress/t/t_mod_topmodule_nest.pl b/test_regress/t/t_mod_topmodule_nest.pl
new file mode 100755
index 000000000..914a14238
--- /dev/null
+++ b/test_regress/t/t_mod_topmodule_nest.pl
@@ -0,0 +1,22 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2021 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+compile(
+    verilator_flags2 => ["--top-module top"]
+    );
+
+execute(
+    check_finished => 1,
+    );
+
+ok(1);
+1;
diff --git a/test_regress/t/t_mod_topmodule_nest.v b/test_regress/t/t_mod_topmodule_nest.v
new file mode 100644
index 000000000..53c8c41d7
--- /dev/null
+++ b/test_regress/t/t_mod_topmodule_nest.v
@@ -0,0 +1,43 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This test verifies that a top-module can be specified which
+// is instantiated beneath another module in the compiled source
+// code, even when that top-module has a module both above and beside
+// it in the hierarchy.
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2021 by Dan Petrisko.
+// SPDX-License-Identifier: CC0-1.0
+
+module top(/*AUTOARG*/
+   // Inputs
+   clk
+   );
+   input clk;
+
+   always_ff @(posedge clk) begin
+      $write("*-* All Finished *-*\n");
+      $finish();
+   end
+
+   under under();
+
+endmodule
+
+module under(/*AUTOARG*/
+   );
+
+endmodule
+
+module faketop(/*AUTOARG*/
+   );
+
+   under under();
+   top top();
+
+   // Stop immediately if this module is instantiated
+   initial begin
+     $stop();
+   end
+
+endmodule

From 93578d64d2852157b391ee00eb4c0b197e331e63 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Wed, 7 Jul 2021 17:56:34 -0400
Subject: [PATCH 69/73] Internals: Remove old needHeavy code.

---
 src/V3EmitC.cpp        |  6 +-----
 src/V3EmitCInlines.cpp | 14 +-------------
 src/V3EmitCModel.cpp   |  6 +-----
 src/V3EmitCSyms.cpp    |  6 +-----
 src/V3Global.h         |  3 ---
 5 files changed, 4 insertions(+), 31 deletions(-)

diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index b2f345698..fc8cb08fa 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -450,11 +450,7 @@ void EmitCImp::emitIntTop(const AstNodeModule* modp) {
     puts("\n");
 
     ofp()->putsIntTopInclude();
-    if (v3Global.needHeavy()) {
-        puts("#include \"verilated_heavy.h\"\n");
-    } else {
-        puts("#include \"verilated.h\"\n");
-    }
+    puts("#include \"verilated_heavy.h\"\n");
     if (v3Global.opt.mtasks()) puts("#include \"verilated_threads.h\"\n");
     if (v3Global.opt.savable()) puts("#include \"verilated_save.h\"\n");
     if (v3Global.opt.coverage()) puts("#include \"verilated_cov.h\"\n");
diff --git a/src/V3EmitCInlines.cpp b/src/V3EmitCInlines.cpp
index 0fd7450d9..2b68ac16f 100644
--- a/src/V3EmitCInlines.cpp
+++ b/src/V3EmitCInlines.cpp
@@ -30,32 +30,20 @@ class EmitCInlines final : EmitCBaseVisitor {
     // STATE
 
     // METHODS
-    void checkHeavy(AstNode* nodep) {
-        if (nodep->isHeavy()) v3Global.needHeavy(true);
-    }
 
     // VISITORS
-    virtual void visit(AstClass* nodep) override {
-        checkHeavy(nodep);
-        iterateChildren(nodep);
-    }
     virtual void visit(AstCNew* nodep) override {
-        checkHeavy(nodep);
         if (v3Global.opt.savable())
             v3warn(E_UNSUPPORTED, "Unsupported: --savable with dynamic new");
         iterateChildren(nodep);
     }
     virtual void visit(AstDumpCtl* nodep) override {
-        checkHeavy(nodep);
         if (v3Global.opt.trace()) v3Global.needTraceDumper(true);
         iterateChildren(nodep);
     }
 
     //---------------------------------------
-    virtual void visit(AstNode* nodep) override {
-        checkHeavy(nodep);
-        iterateChildren(nodep);
-    }
+    virtual void visit(AstNode* nodep) override { iterateChildren(nodep); }
 
 public:
     explicit EmitCInlines(AstNetlist* nodep) { iterate(nodep); }
diff --git a/src/V3EmitCModel.cpp b/src/V3EmitCModel.cpp
index cb1a0ba54..6b67f6fad 100644
--- a/src/V3EmitCModel.cpp
+++ b/src/V3EmitCModel.cpp
@@ -54,11 +54,7 @@ class EmitCModel final : public EmitCFunc {
         // Include files
         puts("\n");
         ofp()->putsIntTopInclude();
-        if (v3Global.needHeavy()) {
-            puts("#include \"verilated_heavy.h\"\n");
-        } else {
-            puts("#include \"verilated.h\"\n");
-        }
+        puts("#include \"verilated_heavy.h\"\n");
         if (v3Global.opt.mtasks()) puts("#include \"verilated_threads.h\"\n");
         if (v3Global.opt.savable()) puts("#include \"verilated_save.h\"\n");
         if (v3Global.opt.coverage()) puts("#include \"verilated_cov.h\"\n");
diff --git a/src/V3EmitCSyms.cpp b/src/V3EmitCSyms.cpp
index bcc22b94a..412773feb 100644
--- a/src/V3EmitCSyms.cpp
+++ b/src/V3EmitCSyms.cpp
@@ -389,11 +389,7 @@ void EmitCSyms::emitSymHdr() {
 
     puts("\n");
     ofp()->putsIntTopInclude();
-    if (v3Global.needHeavy()) {
-        puts("#include \"verilated_heavy.h\"\n");
-    } else {
-        puts("#include \"verilated.h\"\n");
-    }
+    puts("#include \"verilated_heavy.h\"\n");
     if (v3Global.needTraceDumper()) {
         puts("#include \"" + v3Global.opt.traceSourceLang() + ".h\"\n");
     }
diff --git a/src/V3Global.h b/src/V3Global.h
index 8ec6ba819..b0a35f9e0 100644
--- a/src/V3Global.h
+++ b/src/V3Global.h
@@ -98,7 +98,6 @@ class V3Global final {
     bool m_assertScoped = false;  // Tree is scoped
     bool m_constRemoveXs = false;  // Const needs to strip any Xs
     // Experimenting with always requiring heavy, see (#2701)
-    bool m_needHeavy = true;  // Need verilated_heavy.h include
     bool m_needTraceDumper = false;  // Need __Vm_dumperp in symbols
     bool m_dpi = false;  // Need __Dpi include files
     bool m_useParallelBuild = false;  // Use parallel build for model
@@ -142,8 +141,6 @@ public:
     void constRemoveXs(bool flag) { m_constRemoveXs = flag; }
     string debugFilename(const string& nameComment, int newNumber = 0);
     static string digitsFilename(int number);
-    bool needHeavy() const { return m_needHeavy; }
-    void needHeavy(bool flag) { m_needHeavy = flag; }
     bool needTraceDumper() const { return m_needTraceDumper; }
     void needTraceDumper(bool flag) { m_needTraceDumper = flag; }
     bool dpi() const { return m_dpi; }

From 941f96c91380e92b7ac9e07e0d18aaadf65c5000 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Wed, 7 Jul 2021 17:59:22 -0400
Subject: [PATCH 70/73] Commentary

---
 Changes | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Changes b/Changes
index bf318e915..56c2573ed 100644
--- a/Changes
+++ b/Changes
@@ -25,6 +25,7 @@ Verilator 4.205 devel
 **Minor:**
 
 * Optimize a lot more model variables into function locals (#3027). [Geza Lore]
+* Support middle-of-design nested topmodules (#3026). [Dan Petrisko]
 * Remove deprecated --no-relative-cfuncs option (#3024). [Geza Lore]
 * Remove deprecated --inhibit-sim option (#3035). [Geza Lore]
 * Merge const static data globally into a new constant pool (#3013). [Geza Lore]

From 36599133bfdf710c0c267a3e278c564109c4ef19 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Wed, 7 Jul 2021 19:12:52 -0400
Subject: [PATCH 71/73] Add --prof-c to pass profiling to compiler (#3059).

---
 Changes                      |  1 +
 bin/verilator                |  1 +
 bin/verilator_profcfunc      |  2 +-
 ci/ci-script.bash            |  2 ++
 configure.ac                 |  4 ++++
 docs/guide/exe_verilator.rst |  9 +++++++++
 docs/guide/simulating.rst    |  2 --
 include/verilated.mk.in      | 10 ++++++++++
 src/V3EmitMk.cpp             |  2 ++
 src/V3Options.cpp            |  6 ++++--
 src/V3Options.h              |  2 ++
 test_regress/t/t_prof.pl     |  3 ++-
 test_regress/t/t_profc.pl    | 38 ++++++++++++++++++++++++++++++++++++
 13 files changed, 76 insertions(+), 6 deletions(-)
 create mode 100755 test_regress/t/t_profc.pl

diff --git a/Changes b/Changes
index 56c2573ed..933c642b9 100644
--- a/Changes
+++ b/Changes
@@ -24,6 +24,7 @@ Verilator 4.205 devel
 
 **Minor:**
 
+* Add --prof-c to pass profiling to compiler (#3059). [Alexander Grobman]
 * Optimize a lot more model variables into function locals (#3027). [Geza Lore]
 * Support middle-of-design nested topmodules (#3026). [Dan Petrisko]
 * Remove deprecated --no-relative-cfuncs option (#3024). [Geza Lore]
diff --git a/bin/verilator b/bin/verilator
index 0e7dddd1b..b8d272440 100755
--- a/bin/verilator
+++ b/bin/verilator
@@ -367,6 +367,7 @@ detailed descriptions of these arguments.
     --pipe-filter <command>     Filter all input through a script
     --pp-comments               Show preprocessor comments with -E
     --prefix <topname>          Name of top level class
+    --prof-c                    Compile C++ code with profiling
     --prof-cfuncs               Name functions for profiling
     --prof-threads              Enable generating gantt chart data for threads
     --protect-key <key>         Key for symbol protection
diff --git a/bin/verilator_profcfunc b/bin/verilator_profcfunc
index e0c5340bf..7ee22f54c 100755
--- a/bin/verilator_profcfunc
+++ b/bin/verilator_profcfunc
@@ -202,7 +202,7 @@ verilator_profcfunc - Read gprof report created with --prof-cfuncs
 =head1 SYNOPSIS
 
   verilator --prof-cfuncs ....
-  gcc --ggdb -pg ....
+  gcc ....
   {run executable}
   gprof
   verilator_profcfuncs gprof.out
diff --git a/ci/ci-script.bash b/ci/ci-script.bash
index 6ffcda655..0e02a9371 100755
--- a/ci/ci-script.bash
+++ b/ci/ci-script.bash
@@ -69,6 +69,7 @@ elif [ "$CI_BUILD_STAGE_NAME" = "test" ]; then
 
   if [ "$CI_OS_NAME" = "osx" ]; then
     export VERILATOR_TEST_NO_GDB=1  # Pain to get GDB to work on OS X
+    # TODO below may no longer be requried as configure checks for -pg
     export VERILATOR_TEST_NO_GPROF=1  # Apple Clang has no -pg
     # export PATH="/Applications/gtkwave.app/Contents/Resources/bin:$PATH" # fst2vcd
     file bin/verilator_bin
@@ -84,6 +85,7 @@ elif [ "$CI_BUILD_STAGE_NAME" = "test" ]; then
     "$MAKE" -j "$NPROC" -k
   elif [ "$CI_OS_NAME" = "freebsd" ]; then
     export VERILATOR_TEST_NO_GDB=1 # Disable for now, ideally should run
+    # TODO below may no longer be requried as configure checks for -pg
     export VERILATOR_TEST_NO_GPROF=1 # gprof is a bit different on FreeBSD, disable
   fi
 
diff --git a/configure.ac b/configure.ac
index aa5be2ee7..903986a47 100644
--- a/configure.ac
+++ b/configure.ac
@@ -340,6 +340,10 @@ if test "$CFG_ENABLE_COVERAGE" = "yes"; then
   _MY_CXX_CHECK_OPT(CXX,-DVL_GCOV)
 fi
 
+# Compiler flags to enable profiling
+_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_PROFILE,-pg)
+AC_SUBST(CFG_CXXFLAGS_PROFILE)
+
 # Flag to select newest language standard supported
 # Macros work such that first option that passes is the one we take
 # Currently enabled gnu++14/c++14 due to packaged SystemC dependency
diff --git a/docs/guide/exe_verilator.rst b/docs/guide/exe_verilator.rst
index 9fc6b68e8..f92024741 100644
--- a/docs/guide/exe_verilator.rst
+++ b/docs/guide/exe_verilator.rst
@@ -803,6 +803,13 @@ Summary:
    prepended to the name of the :vlopt:`--top` option, or V prepended to
    the first Verilog filename passed on the command line.
 
+.. option:: --prof-c
+
+   When compiling the C++ code, enable the compiler's profiling flag
+   (e.g. :code:`g++ -pg`). See :ref:`Profiling`.
+
+   Using :vlopt:`--prof-cfuncs` also enables :vlopt:`prof-c`.
+
 .. option:: --prof-cfuncs
 
    Modify the created C++ functions to support profiling.  The functions
@@ -813,6 +820,8 @@ Summary:
    came from.  This allows gprof or oprofile reports to be correlated with
    the original Verilog source statements. See :ref:`Profiling`.
 
+   Using :vlopt:`--prof-cfuncs` also enables :vlopt:`prof-c`.
+
 .. option:: --prof-threads
 
    Enable gantt chart data collection for threaded builds. See :ref:`Thread
diff --git a/docs/guide/simulating.rst b/docs/guide/simulating.rst
index 3033a5c22..19f54f198 100644
--- a/docs/guide/simulating.rst
+++ b/docs/guide/simulating.rst
@@ -272,8 +272,6 @@ profiled C++ code functions.
 To use profiling:
 
 #. Use Verilator's :vlopt:`--prof-cfuncs`.
-#. Use Verilator's :vlopt:`-CFLAGS "-g -pg" <-CFLAGS>` to pass the
-   profiling flags through to GCC/Clang.
 #. Build and run the simulation model.
 #. The model will create gmon.out.
 #. Run :command:`gprof` to see where in the C++ code the time is spent.
diff --git a/include/verilated.mk.in b/include/verilated.mk.in
index d11a75745..39e263fa3 100644
--- a/include/verilated.mk.in
+++ b/include/verilated.mk.in
@@ -19,6 +19,8 @@ PYTHON3 = @PYTHON3@
 CFG_WITH_CCWARN = @CFG_WITH_CCWARN@
 CFG_WITH_LONGTESTS = @CFG_WITH_LONGTESTS@
 
+# Compiler flags to enable profiling
+CFG_CXXFLAGS_PROFILE = @CFG_CXXFLAGS_PROFILE@
 # Select newest language
 CFG_CXXFLAGS_STD_NEWEST = @CFG_CXXFLAGS_STD_NEWEST@
 # Select oldest language (for Verilator internal testing only)
@@ -103,6 +105,14 @@ OPT_FAST = -Os
 # to change this as the library is small, but can have significant speed impact.
 OPT_GLOBAL = -Os
 
+#######################################################################
+##### Profile builds
+
+ifeq ($(VM_PROFC),1)
+  CPPFLAGS += $(CFG_CXXFLAGS_PROFILE)
+  LDFLAGS  += $(CFG_CXXFLAGS_PROFILE)
+endif
+
 #######################################################################
 ##### SystemC builds
 
diff --git a/src/V3EmitMk.cpp b/src/V3EmitMk.cpp
index dda111668..23e89fea8 100644
--- a/src/V3EmitMk.cpp
+++ b/src/V3EmitMk.cpp
@@ -168,6 +168,8 @@ public:
         }
 
         of.puts("\n### Switches...\n");
+        of.puts("# C++ code coverage  0/1 (from --prof-c)\n");
+        of.puts(string("VM_PROFC = ") + ((v3Global.opt.profC()) ? "1" : "0") + "\n");
         of.puts("# SystemC output mode?  0/1 (from --sc)\n");
         of.puts(string("VM_SC = ") + ((v3Global.opt.systemC()) ? "1" : "0") + "\n");
         of.puts("# Legacy or SystemC output mode?  0/1 (from --sc)\n");
diff --git a/src/V3Options.cpp b/src/V3Options.cpp
index 9fb3da414..3710dfd3a 100644
--- a/src/V3Options.cpp
+++ b/src/V3Options.cpp
@@ -1222,8 +1222,10 @@ void V3Options::parseOptsList(FileLine* fl, const string& optdir, int argc, char
         if (m_modPrefix == "") m_modPrefix = m_prefix;
     });
     DECL_OPTION("-private", CbCall, [this]() { m_public = false; });
-    DECL_OPTION("-prof-cfuncs", OnOff, &m_profCFuncs);
-    DECL_OPTION("-profile-cfuncs", OnOff, &m_profCFuncs).undocumented();  // Renamed
+    DECL_OPTION("-prof-c", OnOff, &m_profC);
+    DECL_OPTION("-prof-cfuncs", CbCall, [this]() { m_profC = m_profCFuncs = true; });
+    DECL_OPTION("-profile-cfuncs", CbCall,
+                [this]() { m_profC = m_profCFuncs = true; });  // Renamed
     DECL_OPTION("-prof-threads", OnOff, &m_profThreads);
     DECL_OPTION("-protect-ids", OnOff, &m_protectIds);
     DECL_OPTION("-protect-key", Set, &m_protectKey);
diff --git a/src/V3Options.h b/src/V3Options.h
index f6002f722..b8b2c7082 100644
--- a/src/V3Options.h
+++ b/src/V3Options.h
@@ -253,6 +253,7 @@ private:
     bool m_pinsScBigUint = false;   // main switch: --pins-sc-biguint
     bool m_pinsUint8 = false;       // main switch: --pins-uint8
     bool m_ppComments = false;      // main switch: --pp-comments
+    bool m_profC = false;           // main switch: --prof-c
     bool m_profCFuncs = false;      // main switch: --prof-cfuncs
     bool m_profThreads = false;     // main switch: --prof-threads
     bool m_protectIds = false;      // main switch: --protect-ids
@@ -462,6 +463,7 @@ public:
     bool pinsScBigUint() const { return m_pinsScBigUint; }
     bool pinsUint8() const { return m_pinsUint8; }
     bool ppComments() const { return m_ppComments; }
+    bool profC() const { return m_profC; }
     bool profCFuncs() const { return m_profCFuncs; }
     bool profThreads() const { return m_profThreads; }
     bool protectIds() const { return m_protectIds; }
diff --git a/test_regress/t/t_prof.pl b/test_regress/t/t_prof.pl
index d817c90af..bfa4cb19c 100755
--- a/test_regress/t/t_prof.pl
+++ b/test_regress/t/t_prof.pl
@@ -10,6 +10,7 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 
 scenarios(vlt_all => 1);
 
+# TODO below might no longer be requried as configure checks for -pg
 if ($ENV{VERILATOR_TEST_NO_GPROF}) {
     skip("Skipping due to VERILATOR_TEST_NO_GPROF");
 } else {
@@ -20,7 +21,7 @@ ok(1);
 
 sub dotest {
     compile(
-        verilator_flags2 => ["--stats --prof-cfuncs -CFLAGS '-pg' -LDFLAGS '-pg'"],
+        verilator_flags2 => ["--stats --prof-cfuncs"],
         );
 
     unlink $_ foreach (glob "$Self->{obj_dir}/gmon.out.*");
diff --git a/test_regress/t/t_profc.pl b/test_regress/t/t_profc.pl
new file mode 100755
index 000000000..ec6efa483
--- /dev/null
+++ b/test_regress/t/t_profc.pl
@@ -0,0 +1,38 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(vlt => 1);
+
+top_filename("t_prof.v");
+
+ok(1);
+
+sub dotest {
+    compile(
+        verilator_flags2 => ["--stats --prof-c"],
+        );
+
+    unlink $_ foreach (glob "$Self->{obj_dir}/gmon.out.*");
+    setenv('GMON_OUT_PREFIX', "$Self->{obj_dir}/gmon.out");
+
+    execute(
+        check_finished => 1,
+        );
+
+    my $gmon_path;
+    $gmon_path = $_ foreach (glob "$Self->{obj_dir}/gmon.out.*");
+    $gmon_path or error("Profiler did not create a gmon.out");
+    (my $gmon_base = $gmon_path) =~ s!.*[/\\]!!;
+
+    run(cmd => ["cd $Self->{obj_dir} && gprof $Self->{VM_PREFIX} $gmon_base > gprof.out"],
+        check_finished => 0);
+}
+
+1;

From 3aa6332f256e7f107bf1c2f28f3acf899ac403d7 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Wed, 7 Jul 2021 19:42:49 -0400
Subject: [PATCH 72/73] Fix Codacy warnings. No functional change.

---
 docs/_static/css/vlt_sphinx.css | 29 +++++++++++++++++++----------
 src/V3AstNodes.cpp              | 11 ++++++-----
 src/V3Graph.cpp                 |  6 +++---
 3 files changed, 28 insertions(+), 18 deletions(-)

diff --git a/docs/_static/css/vlt_sphinx.css b/docs/_static/css/vlt_sphinx.css
index bb9bc7e1e..8bfb935c4 100644
--- a/docs/_static/css/vlt_sphinx.css
+++ b/docs/_static/css/vlt_sphinx.css
@@ -1,16 +1,25 @@
-/*Verilator blue #008fd7; set in html*/
+/* Verilator blue #008fd7; set in html */
+
 .wy-side-nav-search > div.version {
-    color: #111;
+  color: #111;
 }
-.fa-github::before, .icon-github::before {
-    content: "";
+
+.fa-github::before,
+.icon-github::before {
+  content: "";
 }
-.fa-home::before, .icon-home::before {
-    content: "";
+
+.fa-home::before,
+.icon-home::before {
+  content: "";
 }
-.fa-arrow-circle-right::before, .icon-circle-arrow-right::before {
-    content: "";
+
+.fa-arrow-circle-right::before,
+.icon-circle-arrow-right::before {
+  content: "";
 }
-.fa-arrow-circle-left::before, .icon-circle-arrow-left::before {
-    content: "";
+
+.fa-arrow-circle-left::before,
+.icon-circle-arrow-left::before {
+  content: "";
 }
diff --git a/src/V3AstNodes.cpp b/src/V3AstNodes.cpp
index d51f70fae..d878aa615 100644
--- a/src/V3AstNodes.cpp
+++ b/src/V3AstNodes.cpp
@@ -1458,10 +1458,10 @@ void AstRefDType::dump(std::ostream& str) const {
         if (!s_recursing) {  // Prevent infinite dump if circular typedefs
             s_recursing = true;
             str << " -> ";
-            if (typedefp()) {
-                typedefp()->dump(str);
-            } else if (subDTypep()) {
-                subDTypep()->dump(str);
+            if (const auto subp = typedefp()) {
+                subp->dump(str);
+            } else if (const auto subp = subDTypep()) {
+                subp->dump(str);
             }
             s_recursing = false;
         }
@@ -1506,7 +1506,8 @@ void AstNodeArrayDType::dump(std::ostream& str) const {
 }
 string AstPackArrayDType::prettyDTypeName() const {
     std::ostringstream os;
-    os << subDTypep()->prettyDTypeName() << declRange();
+    if (const auto subp = subDTypep()) os << subp->prettyDTypeName();
+    os << declRange();
     return os.str();
 }
 string AstUnpackArrayDType::prettyDTypeName() const {
diff --git a/src/V3Graph.cpp b/src/V3Graph.cpp
index f292f478f..71070cee2 100644
--- a/src/V3Graph.cpp
+++ b/src/V3Graph.cpp
@@ -133,10 +133,10 @@ void V3GraphVertex::v3errorEnd(std::ostringstream& str) const {
         nsstr << endl;
         nsstr << "-vertex: " << this << endl;
     }
-    if (!fileline()) {
-        V3Error::v3errorEnd(nsstr);
+    if (FileLine* const flp = fileline()) {
+        flp->v3errorEnd(nsstr);
     } else {
-        fileline()->v3errorEnd(nsstr);
+        V3Error::v3errorEnd(nsstr);
     }
 }
 void V3GraphVertex::v3errorEndFatal(std::ostringstream& str) const {

From 8e2ba6a00382075387b32fbbf8f5f85fec482d9a Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Wed, 7 Jul 2021 20:43:07 -0400
Subject: [PATCH 73/73] Version bump

---
 Changes                   | 4 ++--
 configure.ac              | 2 +-
 docs/guide/connecting.rst | 6 +++---
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/Changes b/Changes
index 933c642b9..ca5a3183b 100644
--- a/Changes
+++ b/Changes
@@ -8,7 +8,7 @@ The changes in each Verilator version are described below.  The
 contributors that suggested a given feature are shown in []. Thanks!
 
 
-Verilator 4.205 devel
+Verilator 4.210 2021-07-07
 ==========================
 
 **Major:**
@@ -19,7 +19,7 @@ Verilator 4.205 devel
   object and no longer the TOP module instance.  User code with direct
   C++ member access to model internals, including verilator public_flat
   items will likely need to be updated. See the manual for instructions:
-  https://verilator.org/guide/latest/connecting.html#porting-from-pre-4-206
+  https://verilator.org/guide/latest/connecting.html#porting-from-pre-4-210
   (#3036). [Geza Lore]
 
 **Minor:**
diff --git a/configure.ac b/configure.ac
index 903986a47..174afb803 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,7 +7,7 @@
 
 #AC_INIT([Verilator],[#.### YYYY-MM-DD])
 #AC_INIT([Verilator],[#.### devel])
-AC_INIT([Verilator],[4.205 devel],
+AC_INIT([Verilator],[4.210 2021-07-07],
         [https://verilator.org],
         [verilator],[https://verilator.org])
 # When releasing, also update header of Changes file
diff --git a/docs/guide/connecting.rst b/docs/guide/connecting.rst
index 32e1301ae..bbe35e5aa 100644
--- a/docs/guide/connecting.rst
+++ b/docs/guide/connecting.rst
@@ -39,12 +39,12 @@ model:
   internals, including :code:`/* verilator public_flat */` items.
 
 
-.. _Porting from pre 4.206:
+.. _Porting from pre 4.210:
 
-Model interface changes in version 4.206
+Model interface changes in version 4.210
 ------------------------------------------
 
-Starting from version 4.206, the model class is an interface object.
+Starting from version 4.210, the model class is an interface object.
 
 Up until Verilator version 4.204 inclusive, the generated model class was
 also the instance of the top level instance in the design hierarchy (what