Version bump

Internals: Speedup to only typecheck node child getters in debug builds (#4394 )
Commentary: Changes update
2026-10-03 00:23:35 +02:00 · 2023-08-06 10:39:35 -04:00 · 2023-08-05 03:24:00 -04:00 · 2023-08-05 03:18:00 -04:00 · 2023-08-05 03:07:23 -04:00 · 2023-08-03 02:52:52 -04:00
1223 changed files with 32123 additions and 10823 deletions
@@ -36,12 +36,14 @@ jobs:
        m32: [0, 1]
        exclude:
          # Build pull requests only with ubuntu-22.04 and without m32
-          - os:  ${{ github.event_name == 'pull_request' && 'ubuntu-18.04' || 'do-not-exclude' }}
-          - os:  ${{ github.event_name == 'pull_request' && 'ubuntu-20.04' || 'do-not-exclude' }}
-          - m32: ${{ github.event_name == 'pull_request' && 1              || 'do-not-exclude' }}
-          # Build -m32 only on ubuntu-22.04
+          # - os:  ${{ github.event_name == 'pull_request' && 'ubuntu-18.04' || 'do-not-exclude' }}
+          # - os:  ${{ github.event_name == 'pull_request' && 'ubuntu-20.04' || 'do-not-exclude' }}
+          # - m32: ${{ github.event_name == 'pull_request' && 1              || 'do-not-exclude' }}
+          # Build -m32 only on ubuntu-22.04 clang++
          - {os: ubuntu-18.04, m32: 1}
          - {os: ubuntu-20.04, m32: 1}
+          - compiler: { cc: gcc, cxx: g++ }
+            m32: 1
        include:
          # Build GCC 10 on ubuntu-20.04
          - os: ubuntu-20.04
@@ -105,12 +107,14 @@ jobs:
        suite: [dist-vlt-0, dist-vlt-1, dist-vlt-2, vltmt-0, vltmt-1]
        exclude:
          # Build pull requests only with ubuntu-22.04 and without m32
-          - os:  ${{ github.event_name == 'pull_request' && 'ubuntu-18.04' || 'do-not-exclude' }}
-          - os:  ${{ github.event_name == 'pull_request' && 'ubuntu-20.04' || 'do-not-exclude' }}
-          - m32: ${{ github.event_name == 'pull_request' && 1              || 'do-not-exclude' }}
+          # - os:  ${{ github.event_name == 'pull_request' && 'ubuntu-18.04' || 'do-not-exclude' }}
+          # - os:  ${{ github.event_name == 'pull_request' && 'ubuntu-20.04' || 'do-not-exclude' }}
+          # - m32: ${{ github.event_name == 'pull_request' && 1              || 'do-not-exclude' }}
          # Build -m32 only on ubuntu-22.04
          - {os: ubuntu-18.04, m32: 1}
          - {os: ubuntu-20.04, m32: 1}
+          - compiler: { cc: gcc, cxx: g++ }
+            m32: 1
        include:
          # Test with GCC 10 on ubuntu-20.04 without m32
          - {os: ubuntu-20.04, compiler: { cc: gcc-10, cxx: g++-10 }, m32: 0, suite: dist-vlt-0}
@@ -0,0 +1,84 @@
+# Build and push verilator docker image when tags are pushed to the repository.
+# The following secrets must be configured in the github repository:
+# DOCKER_HUB_NAMESPACE: docker hub namespace.
+# DOCKER_HUB_USER: user name for logging into docker hub
+# DOCKER_HUB_ACCESS_TOKEN: docker hub access token.
+name: Build Verilator Container
+
+on:
+  push:
+    tags: [ 'v*' ]
+  workflow_dispatch:
+    inputs:
+      manual_tag:
+        description: 'Git tag to use for image build'
+        required: true
+        type: string
+      add_latest_tag:
+        description: 'Tag workflow_dispatch docker image as "latest"'
+        required: true
+        type: boolean
+        default: false
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-22.04
+
+    strategy:
+      matrix:
+        contexts:
+          - "ci/docker/run:verilator"
+          # - "ci/docker/buildenv:verilator-buildenv"
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+
+    - name: Extract context variables
+      run: |
+        echo "${{ matrix.contexts }}" | sed -r 's/(.*):.*/build_context=\1/' >> "$GITHUB_ENV"
+        echo "${{ matrix.contexts }}" | sed -r 's/.*:(.*)/image_name=\1/' >> "$GITHUB_ENV"
+        echo "git_tag=${GITHUB_REF#refs/*/}" >> "$GITHUB_ENV"
+
+    - name: Use manual tag
+      if: ${{ inputs.manual_tag }}
+      run: |
+        echo "git_tag=${{ inputs.manual_tag }}" >> "$GITHUB_ENV"
+
+    - name: Docker meta
+      id: docker_meta
+      uses: docker/metadata-action@v4
+      with:
+        images: |
+          ${{ secrets.DOCKER_HUB_NAMESPACE }}/${{ env.image_name }}
+        tags: |
+          type=match,pattern=(v.*),group=1,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
+          type=raw,value=${{ inputs.manual_tag }},enable=${{ inputs.manual_tag != '' }}
+          type=raw,value=latest,enable=${{ inputs.add_latest_tag == true }}
+
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v2
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v2
+      with:
+          buildkitd-flags: --debug
+
+    - name: Login to Docker Hub
+      uses: docker/login-action@v2
+      with:
+        username: ${{ secrets.DOCKER_HUB_USER }}
+        password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+    - name: Build and Push to Docker
+      uses: docker/build-push-action@v4
+      if: startsWith(github.ref, 'refs/tags/v')
+      with:
+        context: ${{ env.build_context }}
+        build-args: SOURCE_COMMIT=${{ env.git_tag }}
+        platforms: linux/arm64,linux/amd64
+        push: ${{ !env.ACT && startsWith(github.ref, 'refs/tags/v') }}
+        tags: ${{ steps.docker_meta.outputs.tags }}
+        labels: ${{ steps.docker_meta.outputs.labels }}
@@ -15,7 +15,7 @@
 cmake_minimum_required(VERSION 3.15)
 cmake_policy(SET CMP0091 NEW) # Use MSVC_RUNTIME_LIBRARY to select the runtime
 project(Verilator
-    VERSION 5.003
+    VERSION 5.014
    HOMEPAGE_URL https://verilator.org
    LANGUAGES CXX
 )
@@ -23,7 +23,8 @@ project(Verilator
 option(DEBUG_AND_RELEASE_AND_COVERAGE
    "Builds both the debug and release binaries, overriding CMAKE_BUILD_TYPE. Not supported under MSBuild.")

-set(PYTHON3 python)
+find_package(Python3 COMPONENTS Interpreter)
+set(PYTHON3 Python3::Interpreter)
 set(CMAKE_INSTALL_DATADIR ${CMAKE_INSTALL_PREFIX})
 include(GNUInstallDirs)
 include(CMakePackageConfigHelpers)
@@ -44,15 +45,7 @@ if (MSVC)
    if (NOT WIN_FLEX_BISON)
        message(FATAL_ERROR "Please install https://github.com/lexxmark/winflexbison and set WIN_FLEX_BISON environment variable. Please use install cmake target after a successful build.")
    endif()
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /std:c++20")
-else()
-    if (NOT DEFINED ENV{FLEX_INCLUDE})
-        message(FATAL_ERROR "Please set environment variable FLEX_INCLUDE to the directory containing FlexLexer.h")
-    endif()
-    set(WIN_FLEX_BISON "$ENV{FLEX_INCLUDE}")
-    if (WIN32 AND NOT MINGW)
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++20")
-    endif()
+    set(CMAKE_CXX_STANDARD 20)
 endif()

 find_package(BISON)
@@ -99,6 +92,7 @@ configure_package_config_file(verilator-config-version.cmake.in verilator-config
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/verilator-config-version.cmake DESTINATION ${CMAKE_INSTALL_PREFIX})

 foreach (program
+    verilator
    verilator_gantt
    verilator_ccache_report
    verilator_difftree
@@ -118,6 +112,7 @@ install(DIRECTORY include TYPE DATA FILES_MATCHING
    PATTERN "include/verilated.mk"
    PATTERN "include/*.[chv]"
    PATTERN "include/*.cpp"
+    PATTERN "include/*.sv"
    PATTERN "include/gtkwave/*.[chv]*"
    PATTERN "include/vltstd/*.[chv]*"
 )
@@ -8,7 +8,244 @@ The changes in each Verilator version are described below.  The
 contributors that suggested a given feature are shown in []. Thanks!


-Verilator 5.006 2022-01-22
+Verilator 5.014 2023-08-06
+==========================
+
+**Minor:**
+
+* Deprecation planned for 32-bit pointer -m32 mode (#4268).
+* Deprecate CMake config below version 3.13 (#4389) (#4390). [Vito Gamberini]
+* Support some stream operations on queues (#4292). [Ryszard Rozak, Antmicro Ltd]
+* Support property declaration with empty parentheses (#4313) (#4317). [Anthony Donlon]
+* Support locator methods with "with" on assoc arrays (#4335). [Ryszard Rozak, Antmicro Ltd]
+* Support string replication with variable (#4341). [Aleksander Kiryk, Antmicro Ltd]
+* Support more types in wait (#4374). [Aleksander Kiryk, Antmicro Ltd]
+* Support static method calls as default values of function arguments (#4378). [Ryszard Rozak, Antmicro Ltd]
+* Add GENUNNAMED lint warning. [Srinivasan Venkataramanan, Deepa Palaniappan]
+* Add MISINDENT lint warning for misleading indentation.
+* Fix 'VlForkSync' redeclaration (#4277). [Krzysztof Bieganski, Antmicro Ltd]
+* Fix processes that can outlive their parents (#4253). [Krzysztof Boronski, Antmicro Ltd]
+* Fix duplicate fork names (#4295). [Ryszard Rozak, Antmicro Ltd]
+* Fix splitting coroutines (#4297) (#4307). [Jiamin Zhu]
+* Fix error when multiple duplicate DPI exports (#4301).
+* Fix class reference assignment checking (#4296). [Ryszard Rozak, Antmicro Ltd]
+* Fix handling of ref types in initial values of type parameters (#4304). [Ryszard Rozak, Antmicro Ltd]
+* Fix comparison of string parameters (#4308). [Ryszard Rozak, Antmicro Ltd]
+* Fix state update for always processes (#4311). [Aleksander Kiryk, Antmicro Ltd]
+* Fix multiple edge timing controls in class methods (#4318) (#4320) (#4344). [Krzysztof Bieganski, Antmicro Ltd]
+* Fix implicit calls of base class constructors with optional arguments (#4319). [Ryszard Rozak, Antmicro Ltd]
+* Fix propagation of process requirement (#4321). [Krzysztof Boroński]
+* Fix unhandled overloads in V3InstrCount (#4324). [Krzysztof Boroński]
+* Fix selects of static members (#4326). [Ryszard Rozak, Antmicro Ltd]
+* Fix references to members of results of static methods (#4327). [Ryszard Rozak, Antmicro Ltd]
+* Fix unique..with method on queues of class objects (#4328). [Ryszard Rozak, Antmicro Ltd]
+* Fix queue slicing (#4329). [Aleksander Kiryk, Antmicro Ltd]
+* Fix wildcard referring types (#4336) (#4342). [Aleksander Kiryk, Antmicro Ltd]
+* Fix comparison of class objects (#4346). [Ryszard Rozak, Antmicro Ltd]
+* Fix unexpected RefDType on assoc arrays (#4337). [Aleksander Kiryk, Antmicro Ltd]
+* Fix cmake astgen for Rocky Linux 8.7 (#4343). [Julian Daube]
+* Fix class timescale in class packages (#4348). [Krzysztof Bieganski, Antmicro Ltd]
+* Fix string concatenations (#4354). [Ryszard Rozak, Antmicro Ltd]
+* Fix unlinked task error from broken context (#4355) (#4402). [Aleksander Kiryk, Antmicro Ltd]
+* Fix selects on unpacked structs (#4359). [Ryszard Rozak, Antmicro Ltd]
+* Fix select operation on assoc array with wide keys (#4360). [Ryszard Rozak, Antmicro Ltd]
+* Fix non-public methods with wide output (#4364). [Ryszard Rozak, Antmicro Ltd]
+* Fix handling of super.new calls (#4366). [Ryszard Rozak, Antmicro Ltd]
+* Fix assign to input var in methods (#4367). [Aleksander Kiryk, Antmicro Ltd]
+* Fix VlProcess not found (#4368). [Aleksander Kiryk, Antmicro Ltd]
+* Fix order of evaluation of function calls in statements (#4375). [Ryszard Rozak, Antmicro Ltd]
+* Fix config_build.h issues (#4380) (#4381). [Andrew Miloradovsky]
+
+
+Verilator 5.012 2023-06-13
+==========================
+
+**Major:**
+
+* With -j or --build-jobs, multithread Verilator's emit phase of Verilation. [Kamil Rakoczy, Antmicro Ltd]
+  Additional Verilator-internal stages will become multithreaded over time.
+
+**Minor:**
+
+* Add --main-top-name option for C main TOP name (#4235) (#4249). [Don Williamson]
+* Add creating __inputs.vpp file with --debug (#4177). [Tudor Timi]
+* Add NEWERSTD warning when using feature in newer language standard (#4168) (#4172). [Ethan Sifferman]
+* Add warning that timing controls in DPI exports are unsupported (#4238). [Krzysztof Bieganski, Antmicro Ltd]
+* Support std::process class (#4212). [Aleksander Kiryk, Antmicro Ltd]
+* Support inside expressions with strings and doubles (#4138) (#4139). [Krzysztof Boroński]
+* Support get_randstate/set_randstate class method functions.
+* Support for condition operator on class objects (#4214). [Ryszard Rozak, Antmicro Ltd]
+* Support array max (#4275). [Aleksander Kiryk, Antmicro Ltd]
+* Optimize VPI callValueCbs (#4155). [Hennadii Chernyshchyk]
+* Configure for faster C++ linking using 'mold', if it is installed.
+* Fix crash on duplicate imported modules (#3231). [Robert Balas]
+* Fix false WIDTHEXPAND on array declarations (#3959). [JOTEGO]
+* Fix marking overridden methods as coroutines (#4120) (#4169). [Krzysztof Bieganski, Antmicro Ltd]
+* Fix SystemC signal copy macro use (#4135). [Josep Sans]
+* Fix duplicate static names in blocks in functions (#4144) (#4160). [Stefan Wallentowitz]
+* Fix initialization order of initial static after function/task (#4159). [Kamil Rakoczy, Antmicro Ltd]
+* Fix linking AstRefDType if it has parameterized class ref (#4164) (#4170). [Ryszard Rozak, Antmicro Ltd]
+* Fix crash caused by $display() optimization (#4165) (#4166). [Tudor Timi]
+* Fix arrays of unpacked structs (#4173). [Risto Pejašinović]
+* Fix $fscanf of decimals overflowing variables (#4174). [Ahmed El-Mahmoudy]
+* Fix super.new missing data type (#4147). [Tudor Timi]
+* Fix missing class forward declarations (#4151). [Krzysztof Boroński]
+* Fix hashes of instances of parameterized classes (#4182). [Ryszard Rozak, Antmicro Ltd]
+* Fix forced assignments that override non-continuous assignments (#4183) (#4192). [Krzysztof Bieganski, Antmicro Ltd]
+* Fix wide structure VL_TOSTRING_W generation (#4188) (#4189). [Aylon Chaim Porat]
+* Fix references to members of parameterized base classes (#4196). [Ryszard Rozak, Antmicro Ltd]
+* Fix tracing undefined alignment (#4201) (#4288) [John Wehle]
+* Fix class specific same methods for AstVarScope, AstVar, and AstScope (#4203) (#4250). [John Wehle]
+* Fix dotted references in parameterized classes (#4206). [Ryszard Rozak, Antmicro Ltd]
+* Fix bit selections under parameterized classes (#4210). [Ryszard Rozak, Antmicro Ltd]
+* Fix duplicate std:: declaration with -I (#4215). [Harald Pretl]
+* Fix deep traversal of class inheritance timing (#4216). [Krzysztof Boroński]
+* Fix class parameters of enum types (#4219). [Ryszard Rozak, Antmicro Ltd]
+* Fix static methods with prototypes (#4220). [Ryszard Rozak, Antmicro Ltd]
+* Fix LATCH warning on function local variables (#4221) (#4284) [Julien Margetts]
+* Fix VCD scope types (#4227) (#4282). [Àlex Torregrosa]
+* Fix incorrect multi-driven lint warning (#4231) (#4248). [Adrien Le Masle]
+* Fix missing assignment for wide unpacked structs (#4233). [Jiamin Zhu]
+* Fix unpacked struct == and != operators (#4234) (#4240). [Risto Pejašinović]
+* Fix AstStructSel clean when data type is structure (#4241) (#4244). [Risto Pejašinović]
+* Fix function calls in with statements (#4245). [Ryszard Rozak, Antmicro Ltd]
+* Fix operator == for unpacked struct, if elements are VlUnpacked arrays (#4247). [Risto Pejašinović]
+* Fix STATIC lifetime for variables created from clocking items (#4262). [Krzysztof Boroński]
+* Fix names of foreach blocks (#4264). [Ryszard Rozak, Antmicro Ltd]
+* Fix iterated variables in foreach loops to have VAUTOM lifetimes (#4265). [Krzysztof Boroński]
+* Fix missing assignment for wide class members (#4267). [Jiamin Zhu]
+* Fix the global uses timing flag when forks exist (#4274). [Krzysztof Bieganski, Antmicro Ltd]
+* Fix struct redefinition (#4276). [Aleksander Kiryk, Antmicro Ltd]
+* Fix detection of wire/reg duplicates.
+* Fix false IMPLICITSTATIC on package functions.
+* Fix method calls on function return values.
+
+
+Verilator 5.010 2023-04-30
+==========================
+
+**Minor:**
+
+* Add --public-depth to force public to a certain instance depth (#3952). [Andrew Nolte]
+* Add --public-params flag (#3990). [Andrew Nolte]
+* Add CONSTRAINTIGN warning when constraint ignored.
+* Add STATICVAR warning and convert to automatic (#4018) (#4027) (#4030). [Ryszard Rozak, Antmicro Ltd]
+* Add error if class types don't match (#4064). [Ryszard Rozak, Antmicro Ltd]
+* Support class extends of package::class.
+* Support class srandom and class random stability.
+* Support class method calls without parenthesis (#3902) (#4082). [Srinivasan Venkataramanan]
+* Support method calls without parenthesis (#4034). [Ryszard Rozak, Antmicro Ltd]
+* Support parameterized return types of methods (#4122). [Ryszard Rozak, Antmicro Ltd]
+* Support parameterized class references in extends statement (#4146). [Ryszard Rozak, Antmicro Ltd]
+* Support complicated IEEE 'for' assignments.
+* Support $fopen as an expression.
+* Support ++/-- on dotted member variables.
+* Optimize static trigger evaluation (#4142). [Geza Lore, X-EPIC]
+* Optimize more xor trees (#4071). [Yutetsu TAKATSUKASA]
+* Change range order warning from LITENDIAN to ASCRANGE (#4010). [Iztok Jeras]
+* Change ZERODLY to a warning.
+* Fix random internal crashes (#666). [Dag Lem]
+* Fix install, standardization in cmake CMakeLists.txt (#3974). [Yu-Sheng Lin]
+* Fix UNDRIVEN warning seg fault (#3989). [Felix Neumärker]
+* Fix symbol entries when inheriting classes (#3995) (#3996). [Krzysztof Boroński]
+* Fix event controls reusing same variable (#4014). Kamil Rakoczy <[email protected]>
+* Fix push to dynamic queue in struct (#4015). [ezchi]
+* Fix names for blocks in do..while loop (#4019). [Ryszard Rozak, Antmicro Ltd]
+* Fix randomize on null field (#4023). [Ryszard Rozak, Antmicro Ltd]
+* Fix rand fields in base classes (#4025). [Ryszard Rozak, Antmicro Ltd]
+* Fix large return blocks with --comp-limit-blocks (#4028). [tenghtt]
+* Fix clocking block scope internal error (#4032). [Srinivasan Venkataramanan]
+* Fix false LATCH warning on --assert 'unique else if' (#4033) ($4054). [Jesse Taube]
+* Fix characters from DEFENV literals for Conda (#4035) (#4044). [Tim Snyder]
+* Fix info message prints under --assert (#4036) (#4053). [Srinivasan Venkataramanan]
+* Fix C++ compile errors when passing class refs as task argument (#4063). [Krzysztof Bieganski, Antmicro Ltd]
+* Fix NBAs inside fork-joins (#4050). [Aleksander Kiryk, Antmicro Ltd]
+* Fix task calls as fork statements (#4055). [Krzysztof Bieganski, Antmicro Ltd]
+* Fix _Vilp used before declaration (#4057) (#4062). [Josep Sans]
+* Fix incorrect optimization of bit op tree (#4059) (#4070). [Yutetsu TAKATSUKASA]
+* Fix parameters in a class body to be localparam (#4061). [Ryszard Rozak, Antmicro Ltd]
+* Fix interface generate begin (#4065). [Srinivasan Venkataramanan]
+* Fix tracing with awaits at end of block (#4075) (#4076). [Krzysztof Bieganski, Antmicro Ltd]
+* Fix sense expression variable naming (#4081). [Kamil Rakoczy]
+* Fix importing symbols from base class (#4084). [Ryszard Rozak, Antmicro Ltd]
+* Fix false error on new const assignment (#4098). [Tudor Timi]
+* Fix unpacked structs under classes (#4102). [Tudor Timi]
+* Fix variables in class methods to be automatic (#4111) (#4137). [Peter Monsson]
+* Fix to use parallel build for projects with a lot of files (#4116). [Krzysztof Boroński]
+* Fix including __Syms header in generated C++ files (#4123). [Krzysztof Boroński]
+* Fix systemc namespace issues (#4126) (#4127). [Eyck Jentzsch]
+* Fix class param extends A=B (#4128). [Ryszard Rozak, Antmicro Ltd]
+* Fix missing begin block hierarchy in --xml-only cells section (#4129) (#4133). [Risto Pejašinović]
+* Fix resolution of class lvalues after parameterization (#4131). [Krzysztof Boroński]
+* Fix DFG error on $countbits (#4101) (#4143). [Paul Donahue]
+* Fix duplicating parameter class types (#4115). [Ryszard Rozak, Antmicro Ltd]
+* Fix class extend param references (#4136).  [Ryszard Rozak, Antmicro Ltd]
+* Fix -CFLAGS to allow overriding optimization levels (#4140). [Peter Monsson]
+* Fix DPI function type alias (#4148) (#4149). [Toru Niina]
+* Fix deleting unused parameterized classes (#4150). [Ryszard Rozak, Antmicro Ltd]
+* Fix false ENUMVALUE on expressions and arrays.
+* Fix unnecessary verilated_std.sv waivers in --waiver-output.
+
+
+Verilator 5.008 2023-03-04
+==========================
+
+**Minor:**
+
+* Add --annotate-points option, change multipoint on line reporting (#3876). [Nassim Corteggiani]
+* Add --verilate-jobs option (#3889). [Kamil Rakoczy, Antmicro Ltd]
+* Add WIDTHEXPAND and WIDTHTRUNC warnings to replace WIDTH (#3900). [Andrew Nolte]
+* Add SOURCE_DATE_EPOCH for docs/guide/conf.py (#3918). [Larry Doolittle]
+* Add /*verilator public[flat|flat_rd|flat_rw| ]*/ metacomments (#3894). [Joseph Nwabueze]
+* Add lint warning on always_comb multidriven (#3888) (#3939). [Adam Bagley]
+* Add warning on ++/-- over expressions with potential side effects (#3976). [Krzysztof Boroński]
+* Add error on mixing .name and by-port instantiations.
+* Removed deprecated --cdc option.
+* Support unpacked unions.
+* Support interface classes and class implements.
+* Support global clocking and $global_clock.
+* Support class parameters without initial values.
+* Support cast to numbers from strings.
+* Support struct I/O in --lib-create (#3378) (#3892). [Varun Koyyalagunta]
+* Support function calls without parenthesis (#3903) (#3902). [Ryszard Rozak, Antmicro Ltd]
+* Support class extending its parameter (#3904). [Ryszard Rozak, Antmicro Ltd]
+* Support static function variables (#3830). [Ryszard Rozak, Antmicro Ltd]
+* Support recursive methods (#3987). [Ryszard Rozak, Antmicro Ltd]
+* Fix real parameters of infinity and NaN.
+* Fix pattern assignment to unpacked structs (#3510). [Mostafa Garnal]
+* Fix single-element replication to dynarray/unpacked/queue (#3548). [Gustav Svensk]
+* Fix constant enum methods (#3621). [Todd Strader]
+* Fix inconsistent naming of generate scope arrays (#3840). [Andrew Nolte]
+* Fix namespace fallback resolution (#3863) (#3942). [Aleksander Kiryk, Antmicro Ltd]
+* Fix std:: to be parsed first (#3864) (#3928). [Aleksander Kiryk, Antmicro Ltd]
+* Fix cmake warning if multiple SOURCES w/o PREFIX (#3916) (#3927). [Yoda Lee]
+* Fix parameterized class function linkage (#3917). [Ryszard Rozak]
+* Fix static members of type aliases of a parameterized class (#3922). [Ryszard Rozak, Antmicro Ltd]
+* Fix class extend parameter dot case (#3926). [Ryszard Rozak, Antmicro Ltd]
+* Fix MsWin missing directory exception, and ::std (#3928) (#3933) (#3935). [Kritik Bhimani]
+* Fix very long VPI signal names (#3929). [Marlon James]
+* Fix VPI upper interface scopes not found (#3937). [David Stanford]
+* Fix virus detection false positive (#3944). [Stuart Morris]
+* Fix constant string function assignment (#3945). [Todd Strader]
+* Fix constant format field widths (#3946). [Todd Strader]
+* Fix class field linking when a super classes is a param (#3949). [Ryszard Rozak, Antmicro Ltd]
+* Fix CMake bad C identifiers (#3948) (#3951). [Zixi Li]
+* Fix build on HP PA architecture (#3954). [John David Anglin]
+* Fix date on the front page of verilator.pdf (#3956) (#3957). [Larry Doolittle]
+* Fix associative arrays declared with ref type (#3960). [Ryszard Rozak, Antmicro Ltd]
+* Fix missing error on negative replicate (#3963). [Benjamin Menküc]
+* Fix self references to parameterized classes (#3962). [Ryszard Rozak, Antmicro Ltd]
+* Fix LITENDIAN warning is backwards (#3966) (#3967). [Cameron Kirk]
+* Fix subsequent parameter declarations (#3969). [Ryszard Rozak, Antmicro Ltd]
+* Fix timing delays to not truncate below 64 bits (#3973) (#3982). [Felix Neumärker]
+* Fix cmake on MacOS to mark weak symbols with -U linker flag (#3978) (#3979). [Peter Debacker]
+* Fix UNDRIVEN warning seg fault (#3989). [Felix Neumärker]
+* Fix coverage of class methods (#3998). [Tim Paine]
+* Fix packed array structure replication.
+* Fix enum.next(0) and enum.prev(0).
+
+
+Verilator 5.006 2023-01-22
 ==========================

 **Minor:**
@@ -20,7 +257,8 @@ Verilator 5.006 2022-01-22
 * Support property calls without parenthesis (#3879) (#3893). [Ryszard Rozak, Antmicro Ltd]
 * Support import/export lists in modport (#3886). [Gökçe Aydos]
 * Support class queue equality (#3895). [Ilya Barkov]
-* Add IMPLICITSTATIC warning when a ftask/function is implicitly static (#3839). [Ryszard Rozak, Antmicro Ltd]
+* Support type case and type equality comparisons.
+* Add IMPLICITSTATIC warning when a task/function is implicitly static (#3839). [Ryszard Rozak, Antmicro Ltd]
 * Add VL_VALUE_STRING_MAX_WORDS override (#3869). [Andrew Nolte]
 * Optimize expansion of extend operators.
 * Internal multithreading tests. [Mariusz Glebocki, et al, Antmicro Ltd]
@@ -34,7 +272,7 @@ Verilator 5.006 2022-01-22
 * Fix self references when param class instantiated (#3833). [Ryszard Rozak, Antmicro Ltd]
 * Fix memory leak in V3Sched, etc. (#3834). [Geza Lore]
 * Fix compatibility with musl libc / Alpine Linux (#3845). [Sören Tempel]
-* Fix empty case items crash (#3851). [rporter]
+* Fix empty case items crash (#3851). [Rich Porter]
 * Fix VL_CPU_RELAX on MIPS/Armel/s390/sparc (#3843) (#3891). [Kamil Rakoczy]
 * Fix module parameter name collision (#3854) (#3855). [James Shi]
 * Fix unpacked array expansion (#3861). [Joey Liu]
@@ -44,6 +282,8 @@ Verilator 5.006 2022-01-22
 * Fix foreach unnamedblk duplicate error (#3885). [Ilya Barkov]
 * Fix elaboration of member selected classes (#3890). [Ilya Barkov]
 * Fix mismatched widths in DFG (#3872). [Geza Lore, Yike Zhou]
+* Fix lint for non-integral types in packed structs.
+* Fix generate case with empty body statements.


 Verilator 5.004 2022-12-14
@@ -15,13 +15,13 @@
 #
 #****************************************************************************/
 #
-# make all	to compile and build Verilator.
-# make install	to install it.
-# make TAGS	to update tags tables.
+# make all      to compile and build Verilator.
+# make install  to install it.
+# make TAGS     to update tags tables.
 #
 # make clean  or  make mostlyclean
 #      Delete all files from the current directory that are normally
-#      created by building the program.	 Don't delete the files that
+#      created by building the program.  Don't delete the files that
 #      record the configuration.  Also preserve files that could be made
 #      by building, but normally aren't because the distribution comes
 #      with them.
@@ -153,7 +153,7 @@ msg_test: all_nomsg
 	@echo

 .PHONY: test
-ifeq ($(CFG_WITH_LONGTESTS),yes)	# Local... Else don't burden users
+ifeq ($(CFG_WITH_LONGTESTS),yes)  # Local... Else don't burden users
 test: smoke-test test_regress
 # examples is part of test_regress's test_regress/t/t_a2_examples.pl
 # (because that allows it to run in parallel with other test_regress's)
@@ -424,17 +424,15 @@ YAPF_FLAGS = -i
 yapf:
 	$(YAPF) $(YAPF_FLAGS) $(PY_FILES)

-FLAKE8 = flake8
-FLAKE8_FLAGS = \
-	--extend-exclude=fastcov.py \
-	--ignore=E123,E129,E251,E402,E501,W503,W504,E701
-
 PYLINT = pylint
 PYLINT_FLAGS = --score=n --disable=R0801

+RUFF = ruff
+RUFF_FLAGS = check --ignore=E402,E501,E701
+
 lint-py:
-	-$(FLAKE8) $(FLAKE8_FLAGS) $(PY_PROGRAMS)
 	-$(PYLINT) $(PYLINT_FLAGS) $(PY_PROGRAMS)
+	-$(RUFF) $(RUFF_FLAGS) $(PY_PROGRAMS)

 format-pl-exec:
 	-chmod a+x test_regress/t/*.pl
@@ -451,8 +449,8 @@ install-msg:

 IN_WILD := ${srcdir}/*.in ${srcdir}/*/*.in

-# autoheader might not change config_build.h.in, so touch it
-${srcdir}/config_build.h: ${srcdir}/config_build.h.in configure
+# autoheader might not change config_package.h.in, so touch it
+${srcdir}/config_package.h: ${srcdir}/config_package.h.in configure
 	cd ${srcdir} && autoheader
 	touch $@
 Makefile: Makefile.in config.status $(IN_WILD)
@@ -462,7 +460,7 @@ config.status: configure
 	./config.status --recheck

 configure: configure.ac
-ifeq ($(CFG_WITH_CCWARN),yes)	# Local... Else don't burden users
+ifeq ($(CFG_WITH_CCWARN),yes)  # Local... Else don't burden users
 	autoconf --warnings=all
 else
 	autoconf
@@ -501,7 +499,7 @@ distclean maintainer-clean::
 TAGFILES=${srcdir}/*/*.cpp ${srcdir}/*/*.h ${srcdir}/*/*.in \
 	${srcdir}/*.in ${srcdir}/*.pod

-TAGS:	$(TAGFILES)
+TAGS: $(TAGFILES)
 	etags $(TAGFILES)

 .PHONY: doxygen
@@ -1,12 +1,16 @@
 .. Github doesn't render images unless absolute URL
 .. Do not know of a conditional tag, "only: github" nor "github display" works

+.. image:: https://img.shields.io/badge/Website-Verilator.org-181717.svg
+    :target: https://verilator.org
 .. image:: https://img.shields.io/badge/License-LGPL%20v3-blue.svg
-    :target: https://www.gnu.org/licenses/lgpl-3.0]
+    :target: https://www.gnu.org/licenses/lgpl-3.0
 .. image:: https://img.shields.io/badge/License-Artistic%202.0-0298c3.svg
    :target: https://opensource.org/licenses/Artistic-2.0
 .. image:: https://repology.org/badge/tiny-repos/verilator.svg?header=distro%20packages
    :target: https://repology.org/project/verilator/versions
+.. image:: https://img.shields.io/docker/pulls/verilator/verilator
+    :target: https://hub.docker.com/r/verilator/verilator
 .. image:: https://api.codacy.com/project/badge/Grade/fa78caa433c84a4ab9049c43e9debc6f
    :target: https://www.codacy.com/gh/verilator/verilator
 .. image:: https://codecov.io/gh/verilator/verilator/branch/master/graph/badge.svg
@@ -57,17 +61,16 @@ files, the "Verilated" code.

 These Verilated C++/SystemC files are then compiled by a C++ compiler
 (gcc/clang/MSVC++), optionally along with a user's own C++/SystemC wrapper
-file to instantiate the Verilated model. Executing the resulting executable
-performs the design simulation. Verilator also supports linking Verilated
-generated libraries, optionally encrypted, into other simulators.
+file, to instantiate the Verilated model. Executing the resulting
+executable performs the design simulation. Verilator also supports linking
+Verilated generated libraries, optionally encrypted, into other simulators.

 Verilator may not be the best choice if you are expecting a full-featured
 replacement for a closed-source Verilog simulator, needs SDF annotation,
 mixed-signal simulation, or are doing a quick class project (we recommend
 `Icarus Verilog`_ for classwork.)  However, if you are looking for a path
 to migrate SystemVerilog to C++/SystemC, or want high-speed simulation of
-synthesizable designs containing limited verification constructs, Verilator
-is the tool for you.
+designs, Verilator is the tool for you.


 Performance
@@ -83,11 +86,11 @@ as `Icarus Verilog`_. Another 2-10x speedup might be gained from
 multithreading (yielding 200-1000x total over interpreted simulators).

 Verilator has typically similar or better performance versus the
-closed-source Verilog simulators (Carbon Design Systems Carbonator,
+closed-source Verilog simulators (e.g., Carbon Design Systems Carbonator,
 Modelsim/Questa, Cadence Incisive/NC-Verilog, Synopsys VCS, VTOC, and
 Pragmatic CVer/CVC). But, Verilator is open-sourced, so you can spend on
 computes rather than licenses. Thus, Verilator gives you the best
-cycles/dollar.
+simulation cycles/dollar.


 Installation & Documentation
@@ -362,7 +362,7 @@ detailed descriptions of these arguments.
     +incdir+<dir>              Directory to search for includes
    --inline-mult <value>       Tune module inlining
    --instr-count-dpi <value>   Assumed dynamic instruction count of DPI imports
-     -j <jobs>                  Parallelism for --build (alias to --build-jobs)
+     -j <jobs>                  Parallelism for --build-jobs/--verilate-jobs
    --l2-name <value>           Verilog scope name of the top module
    --language <lang>           Default language standard to parse
     -LDFLAGS <flags>           Linker pre-object arguments for makefile
@@ -372,6 +372,7 @@ detailed descriptions of these arguments.
    --make <build-tool>         Generate scripts for specified build tool
     -MAKEFLAGS <flags>         Arguments to pass to make during --build
    --main                      Generate C++ main() file
+    --main-top-name             Specify top name passed to Verilated model in generated C++ main
    --max-num-width <value>     Maximum number width (default: 64K)
    --Mdir <directory>          Name of output object directory
    --MMD                       Create .d dependency files
@@ -404,6 +405,7 @@ detailed descriptions of these arguments.
    --protect-key <key>         Key for symbol protection
    --protect-lib <name>        Create a DPI protected library
    --public                    Debugging; see docs
+    --public-params             Mark all parameters as public_flat
    --public-flat-rw            Mark all variables, etc as public_flat_rw
     -pvalue+<name>=<value>     Overwrite toplevel parameter
    --quiet-exit                Don't print the command on failure
@@ -416,6 +418,7 @@ detailed descriptions of these arguments.
    --no-skip-identical         Disable skipping identical output
    --stats                     Create statistics file
    --stats-vars                Provide statistics on variables
+    --no-std                    Prevent parsing standard library
    --structs-packed            Convert all unpacked structures to packed structures
     -sv                        Enable SystemVerilog parsing
     +systemverilogext+<ext>    Synonym for +1800-2017ext+<ext>
@@ -445,6 +448,7 @@ detailed descriptions of these arguments.
    --unused-regexp <regexp>    Tune UNUSED lint signals
     -V                         Verbose version and config
     -v <filename>              Verilog library
+    --verilate-jobs             Job threads for Verilation stage
    --no-verilate               Skip Verilation and just compile previously Verilated code
     +verilog1995ext+<ext>      Synonym for +1364-1995ext+<ext>
     +verilog2001ext+<ext>      Synonym for +1364-2001ext+<ext>
@@ -169,6 +169,7 @@ L<https://verilator.org/guide/latest/exe_verilator_coverage.html>.
    --annotate <output_dir>       Directory name for source annotation.
    --annotate-all                All files should be shown.
    --annotate-min <count>        Minimum occurrence count for uncovered.
+    --annotate-points             Annotates info from each coverage point.
    --help                        Displays this message and version and exits.
    --rank                        Compute relative importance of tests.
    --unlink                      With --write, unlink all inputs
@@ -42,8 +42,8 @@ def diff_dir(a, b):
            continue
        a = files[base]['a']
        b = files[base]['b']
-        print("=" * 70)
-        print("= %s <-> %s" % (a, b))
+        print("=" * 70, flush=True)
+        print("= %s <-> %s" % (a, b), flush=True)
        diff_file(a, b)
        anyfile = True
    if not anyfile:
@@ -61,7 +61,7 @@ if [ "$CI_BUILD_STAGE_NAME" = "build" ]; then
    sudo apt-get update
    sudo apt-get install ccache help2man libfl-dev ||
    sudo apt-get install ccache help2man libfl-dev
-    if [ "$CI_RUNS_ON" != "ubuntu-22.04" ]; then
+    if [ "$CI_RUNS_ON" = "ubuntu-20.04" ]; then
      # Some conflict of libunwind verison on 22.04, can live without it for now
      sudo apt-get install libgoogle-perftools-dev ||
      sudo apt-get install libgoogle-perftools-dev
@@ -70,6 +70,10 @@ if [ "$CI_BUILD_STAGE_NAME" = "build" ]; then
      sudo apt-get install libsystemc libsystemc-dev ||
      sudo apt-get install libsystemc libsystemc-dev
    fi
+    if [ "$CI_RUNS_ON" = "ubuntu-22.04" ]; then
+      sudo apt-get install mold ||
+      sudo apt-get install mold
+    fi
    if [ "$COVERAGE" = 1 ]; then
      yes yes | sudo cpan -fi Parallel::Forker
    fi
@@ -102,8 +106,8 @@ elif [ "$CI_BUILD_STAGE_NAME" = "test" ]; then
    sudo apt-get install gdb gtkwave lcov libfl-dev ccache
    # Required for test_regress/t/t_dist_attributes.pl
    if [ "$CI_RUNS_ON" = "ubuntu-22.04" ]; then
-      sudo apt-get install libclang-dev ||
-      sudo apt-get install libclang-dev
+      sudo apt-get install libclang-dev mold ||
+      sudo apt-get install libclang-dev mold
      pip3 install clang==14.0
    fi
    if [ "$CI_RUNS_ON" = "ubuntu-20.04" ] || [ "$CI_RUNS_ON" = "ubuntu-22.04" ]; then
@@ -4,12 +4,12 @@ if (-Not (Test-Path $PWD/../.ccache/win_bison.exe)) {
 	mkdir build
 	cd build
 	cmake .. --install-prefix $PWD/../../../.ccache
-	cmake --build . --config Release
+	cmake --build . --config Release -j 3
 	cmake --install . --prefix $PWD/../../../.ccache
 	cd ../..
 }
 mkdir build
 cd build
 cmake .. --install-prefix $PWD/../install
-cmake --build . --config Release
+cmake --build . --config Release -j 3
 cmake --install . --prefix $PWD/../install
@@ -4,7 +4,7 @@ cd examples/cmake_tracing_c
 mkdir build
 cd build
 cmake ..
-cmake --build . --config Release
+cmake --build . --config Release -j 3
 Release/example.exe
 cd ..
 Remove-Item -path build -recurse
@@ -19,10 +19,16 @@ RUN apt-get update \
                        ccache \
                        flex \
                        git \
+                        help2man \
+                        libfl2 \
                        libfl-dev \
                        libgoogle-perftools-dev \
+                        numactl \
                        perl \
+                        perl-doc \
                        python3 \
+                        zlib1g \
+                        zlib1g-dev \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/*

@@ -39,7 +45,7 @@ RUN git clone "${REPO}" verilator && \
    git checkout "${SOURCE_COMMIT}" && \
    autoconf && \
    ./configure && \
-    make -j "$(nproc)" && \
+    make && \
    make install && \
    cd .. && \
    rm -r verilator
@@ -5,16 +5,16 @@
 # General Public License Version 3 or the Perl Artistic License Version 2.0.
 # SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0

-# When releasing, also update header of Changes file
+# When releasing, also update header of Changes file, and CmakeLists.txt,
 # and commit using "devel release" or "Version bump" message
 # Then 'make maintainer-dist'
 #AC_INIT([Verilator],[#.### YYYY-MM-DD])
 #AC_INIT([Verilator],[#.### devel])
-AC_INIT([Verilator],[5.006 2023-01-22],
+AC_INIT([Verilator],[5.014 2023-08-06],
        [https://verilator.org],
        [verilator],[https://verilator.org])

-AC_CONFIG_HEADERS(src/config_build.h)
+AC_CONFIG_HEADERS(src/config_package.h)
 AC_CONFIG_FILES(Makefile src/Makefile src/Makefile_obj include/verilated.mk include/verilated_config.h verilator.pc verilator-config.cmake verilator-config-version.cmake)

 # Version
@@ -68,7 +68,7 @@ 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.])],
+                               including Verilator and generated models.])],
              [case "${enableval}" in
                yes) CFG_ENABLE_M32=yes ;;
                no)  CFG_ENABLE_M32=no ;;
@@ -470,6 +470,10 @@ m4_foreach([ldflag], [
 AC_SUBST(CFG_LDLIBS_THREADS)
 AC_SUBST(CFG_LDFLAGS_THREADS_CMAKE)

+# If 'mold' is installed, use it to link for faster buildtimes
+_MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_SRC, -fuse-ld=mold)
+_MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_VERILATED, -fuse-ld=mold)
+
 # When linking partially statically
 if test "$CFG_ENABLE_PARTIAL_STATIC" = "yes"; then
  _MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_SRC, -static-libgcc)
@@ -480,6 +484,7 @@ else
  LTCMALLOC=-ltcmalloc_minimal
 fi
 AC_SUBST(CFG_LDFLAGS_SRC)
+AC_SUBST(CFG_LDFLAGS_VERILATED)

 # The pthread library is required by tcmalloc, so add it if it exists. If it
 # does not, the tcmalloc check below will fail anyway, and linking against
@@ -10,9 +10,12 @@ contributions flow more efficiently.
 Did you find a bug?
 -------------------

- Please **Ensure the bug was not already reported** by searching
+- Please **ensure the bug was not already reported** by searching
  `Verilator Issues <https://verilator.org/issues>`__.

+- Please **download the latest development GitHub version**, build, and see
+  if the issue has been fixed.
+
 - If you're unable to find an open issue addressing the problem, `open a
  new Verilator issue <https://verilator.org/issues/new>`__.

@@ -20,21 +23,28 @@ Did you find a bug?
    demonstrating the bug and expected behavior that is not occurring.

  - The ideal example works against other simulators, and is in the
-    test_regress/t test format, as described in `docs/internals
-    <internals.rst>`__.
+    test_regress/t test format, as described in
+    `Verilator Internals Documentation
+    <https://github.com/verilator/verilator/blob/master/docs/internals.rst>`__.


 Did you write a patch that fixes a bug?
 ---------------------------------------

- Please `Open a new issue <https://verilator.org/issues/new>`__.
+- Please `Open a new Verilator issue <https://verilator.org/issues/new>`__
+  if there is not one already describing the bug.

- You may attach a patch to the issue, or (preferred) may request a
-  GitHub pull request.
+- Please `Open a Verilator pull request
+  <https://github.com/verilator/verilator/pulls>`__.

-  - Verilator uses GitHub Actions to provide continuous integration.  You
-    may want to enable Actions on your GitHub branch to ensure your changes
-    keep the tests passing. See `docs/internals <internals.rst>`__.
+- See the coding conventions, and other developer information in
+  ``docs/internals.rst`` in the distribution, or as rendered at
+  `Verilator Internals Documentation
+  <https://github.com/verilator/verilator/blob/master/docs/internals.rst>`__.
+
+- Verilator uses GitHub Actions to provide continuous integration.  You
+  may want to enable Actions on your GitHub branch to ensure your changes
+  keep the tests passing.

 - Your source-code contributions must be certified as open source,
  under the `Developer Certificate of
@@ -56,13 +66,10 @@ Did you write a patch that fixes a bug?
    contribution.

 - Your test contributions are generally considered released into the
-  Creative Commons Public Domain (CC0), unless you request otherwise or
+  Creative Commons Public Domain (CC0), unless you request otherwise, or
  put a GNU/Artistic license on your file.

- Most important is we get your patch. If you'd like to clean up
-  indentation and related issues ahead of our feedback, that is
-  appreciated; please see the coding conventions in `docs/internals
-  <internals.rst>`__.
+- Most important is we get your patch.


 Do you have questions?
@@ -3,6 +3,7 @@ under the Developer Certificate of Origin (https://developercertificate.org/).

 Please see the Verilator manual for 200+ additional contributors. Thanks to all.

+Adam Bagley
 Adrien Le Masle
 Ahmed El-Mahmoudy
 Aleksander Kiryk
@@ -11,8 +12,13 @@ Alex Chadwick
 Aliaksei Chapyzhenka
 Ameya Vikram Singh
 Andreas Kuster
+Andrei Kostovski
+Andrew Miloradovsky
 Andrew Nolte
+Anthony Donlon
 Arkadiusz Kozdra
+Aylon Chaim Porat
+Cameron Kirk
 Chris Randall
 Chuxuan Wang
 Conor McCullough
@@ -22,13 +28,19 @@ David Horton
 David Metz
 David Stanford
 David Turner
+Don Williamson
 Drew Ranck
 Drew Taussig
 Driss Hafdi
 Edgar E. Iglesias
 Eric Rippey
+Ethan Sifferman
+Eyck Jentzsch
 Fan Shupei
+february cozzocrea
+Felix Neumärker
 Felix Yan
+G-A. Kamendje
 Garrett Smith
 Geza Lore
 Gianfranco Costamagna
@@ -37,16 +49,16 @@ Gökçe Aydos
 Graham Rushton
 Guokai Chen
 Gustav Svensk
-G-A. Kamendje
 Harald Heckmann
+Hennadii Chernyshchyk
 Howard Su
 Huang Rui
 Huanghuang Zhou
 HungMingWu
 HyungKi Jeong
+Ilya Barkov
 Iru Cai
 Ivan Vnučec
-Ilya Barkov
 Iztok Jeras
 Jake Merdich
 James Hanlon
@@ -58,14 +70,21 @@ Jamie Iles
 Jan Van Winkel
 Jean Berniolles
 Jeremy Bennett
+Jesse Taube
 Jevin Sweval
 Jiacheng Qian
+Jiamin Zhu
 Jiuyang Liu
 Joey Liu
 John Coiner
 John Demme
+John Wehle
 Jonathan Drolet
+Jose Loyola
+Josep Sans
+Joseph Nwabueze
 Josh Redford
+Julian Daube
 Julie Schwartz
 Julien Margetts
 Kaleb Barrett
@@ -75,6 +94,8 @@ Keith Colbert
 Kevin Kiningham
 Kritik Bhimani
 Krzysztof Bieganski
+Krzysztof Boronski
+Krzysztof Boroński
 Kuba Ober
 Larry Doolittle
 Ludwig Rogiers
@@ -100,9 +121,11 @@ Mostafa Gamal
 Nandu Raj
 Nathan Kohagen
 Nathan Myers
+Oleh Maksymenko
 Patrick Stewart
 Paul Wright
 Pawel Sagan
+Peter Debacker
 Peter Horvath
 Peter Monsson
 Philipp Wagner
@@ -113,23 +136,29 @@ Qingyao Sun
 Rafal Kapuscik
 Raynard Qiao
 Richard Myers
+Risto Pejašinović
+Robert Balas
 Rupert Swarbrick
 Ryszard Rozak
 Samuel Riedel
 Sean Cross
 Sebastien Van Cauwenberghe
 Sergi Granell
+Srinivasan Venkataramanan
 Stefan Wallentowitz
 Stephen Henry
 Steven Hugg
 Sören Tempel
 Teng Huang
+Tim Hutt
 Tim Snyder
 Tobias Rosenkranz
 Tobias Wölfel
 Todd Strader
 Tomasz Gorochowik
 Topa Topino
+Toru Niina
+Tudor Timi
 Tymoteusz Blazejczyk
 Udi Finkelstein
 Unai Martinez-Corral
@@ -137,14 +166,17 @@ Varun Koyyalagunta
 Vassilis Papaefstathiou
 Veripool API Bot
 Victor Besyakov
+Vito Gamberini
 William D. Jones
 Wilson Snyder
 Xi Zhang
 Yinan Xu
 Yoda Lee
 Yossi Nivin
+Yu-Sheng Lin
 Yuri Victorovich
 Yutetsu TAKATSUKASA
-Yu-Sheng Lin
 Yves Mathieu
 Zhanglei Wang
+Zixi Li
+أحمد المحمودي
@@ -18,12 +18,16 @@
 RST2HTML = rst2html
 PYTHON3 = python3
 DOXYGEN = doxygen
-SPHINXOPTS ?= -c guide
 SPHINXBUILD ?= sphinx-build

 SOURCEDIR = guide
 BUILDDIR = _build

+SPHINXOPTS ?= -c guide
+ifneq ($(VERILATOR_ANALYTICS_ID),)
+SPHINXOPTS += -D html_theme_options.analytics_id=$(VERILATOR_ANALYTICS_ID)
+endif
+
 ######################################################################

 .SUFFIXES:
@@ -1,4 +1,4 @@
-.. comment: generated by t_lint_width_docs_bad
+.. comment: generated by t_lint_widthexpand_docs_bad
 .. code-block:: sv
   :linenos:
   :emphasize-lines: 3
@@ -1,4 +1,4 @@
-.. comment: generated by t_lint_width_docs_bad
+.. comment: generated by t_lint_widthexpand_docs_bad
 .. code-block:: sv
   :emphasize-lines: 1

@@ -0,0 +1,4 @@
+.. comment: generated by t_lint_widthexpand_docs_bad
+.. code-block::
+
+   %Warning-WIDTHEXPAND: example.v:3:29 Bit extraction of array[4:0] requires 3 bit index, not 2 bits.
@@ -1,4 +0,0 @@
-.. comment: generated by t_lint_width_docs_bad
-.. code-block::
-
-   %Warning-WIDTH: example.v:3:29 Bit extraction of array[4:0] requires 3 bit index, not 2 bits.
@@ -10,7 +10,6 @@
 # ----------------------------------------------------------------------
 # -- Path setup

-from datetime import datetime
 import os
 import re
 import sys
@@ -24,10 +23,18 @@ def get_vlt_version():
    filename = "../../Makefile"
    with open(filename, "r", encoding="utf8") as fh:
        for line in fh:
-            match = re.search(r"PACKAGE_VERSION_NUMBER *= *([a-z0-9.]+)", line)
+            match = re.search(r"PACKAGE_VERSION *= *([a-z0-9.]+) +([-0-9]+)",
+                              line)
            if match:
-                return match.group(1)
-    return "unknown"
+                return match.group(1), match.group(2)
+            match = re.search(r"PACKAGE_VERSION *= *([a-z0-9.]+) +devel", line)
+            if match:
+                try:
+                    data = os.popen('git log -n 1 --pretty=%cs').read()
+                except Exception:  # pylint: disable=broad-except
+                    data = ""  # fallback, and Sphinx will fill in today's date
+                return "Devel " + match.group(1), data
+    return "unknown", "unknown"


 def setup(app):
@@ -44,8 +51,8 @@ author = 'Wilson Snyder'
 # The master toctree document.
 master_doc = "index"

-version = get_vlt_version()
-release = get_vlt_version()
+version, today_fmt = get_vlt_version()
+release = version

 rst_prolog = """
 .. role:: vlopt(option)
@@ -89,9 +96,6 @@ source_suffix = [".rst"]
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']

-# Date format to ISO
-today_fmt = datetime.now().strftime("%F")
-
 # If true, `todo` and `todoList` produce output, else they produce nothing.
 todo_include_todos = True

@@ -111,7 +115,6 @@ html_theme = 'sphinx_rtd_theme'
 html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]

 html_theme_options = {
-    'analytics_id': 'G-D27B0C9QEB',
    'logo_only': True,
    'style_nav_header_background': "#45acf8",  # Default is #2980B9
    # 'canonical_url':
@@ -120,6 +120,15 @@ code.  This is a feature, as using the SystemC pin interconnect scheme
 everywhere would reduce performance by an order of magnitude.


+Verilated API
+=============
+
+The API to a Verilated model is the C++ headers in the include/ directory
+in the distribution.  These headers use Doxygen comments, `///` and `//<`,
+to indicate and document those functions that are part of the Verilated
+public API.
+
+
 Direct Programming Interface (DPI)
 ==================================

@@ -374,9 +383,11 @@ changed on the specified clock edge.
 .. code-block:: bash

     cat >our.v <<'EOF'
-       module our (input clk);
-          reg readme   /*verilator public_flat_rd*/;
-          reg writeme  /*verilator public_flat_rw @(posedge clk) */;
+       module our #(
+          parameter WIDTH /*verilator public_flat_rd*/ = 32
+       ) (input clk);
+          reg [WIDTH-1:0] readme   /*verilator public_flat_rd*/;
+          reg [WIDTH-1:0] writeme  /*verilator public_flat_rw @(posedge clk) */;
          initial $finish;
       endmodule
     EOF
@@ -398,12 +409,14 @@ accesses the above signal "readme" would be:
           vpiHandle vh1 = vpi_handle_by_name((PLI_BYTE8*)"TOP.our.readme", NULL);
           if (!vh1) vl_fatal(__FILE__, __LINE__, "sim_main", "No handle found");
           const char* name = vpi_get_str(vpiName, vh1);
-           printf("Module name: %s\n", name);  // Prints "readme"
+           const char* type = vpi_get_str(vpiType, vh1);
+           const int size = vpi_get(vpiSize, vh1);
+           printf("register name: %s, type: %s, size: %d\n", name, type, size);  // Prints "register name: readme, type: vpiReg, size: 32"

           s_vpi_value v;
           v.format = vpiIntVal;
           vpi_get_value(vh1, &v);
-           printf("Value of v: %d\n", v.value.integer);  // Prints "readme"
+           printf("Value of %s: %d\n", name, v.value.integer);  // Prints "Value of readme: 0"
       }

       int main(int argc, char** argv) {
@@ -479,11 +492,12 @@ distribution.
 Verilated and VerilatedContext
 ==============================

-Multiple Verilated models may be part of the same simulation context, that
-is share a VPI interface, sense of time, and common settings.  This common
-simulation context information is stored in a ``VerilatedContext``
+Multiple C++ Verilated models may be part of the same simulation context,
+that is share a VPI interface, sense of time, and common settings.  This
+common simulation context information is stored in a ``VerilatedContext``
 structure.  If a ``VerilatedContext`` is not created prior to creating a
-model, a default global one is created automatically.
+model, a default global one is created automatically.  SystemC requires
+using only the single, default VerilatedContext.

 The ``Verilated::`` methods, including the ``Verilated::commandArgs`` call
 shown above, call VerilatedContext methods using the default global
@@ -17,14 +17,10 @@ C++11 compiler support
  Verilator will require C++20 or newer compilers for both compiling
  Verilator and compiling all Verilated models no sooner than January 2025.

-Verilated_heavy.h
-  The legacy "verilated_heavy.h" include was replaced with just including
-  "verilated.h". Verilated_heavy.h is planned for removal no sooner than
-  July 2022.
-
-Option `--cdc`
-  The experimental `--cdc` option is believed to be generally unused and is
-  planned for removal no sooner than January 2023.
+32-bit compiler support
+  Verilator currently regresses both 64-bit and 32-bit pointer modes (GCC's
+  `-m64` and `-m32`).  Support for 32-bit `-m32` mode will be deprecated no
+  sooner than January 2024.

 Option `-O<letter>`
  The debug `-O<letter>` options have been replaced with
@@ -91,9 +91,29 @@ associated programs.

 .. option:: VERILATOR_ROOT

-   Specifies the directory containing the distribution kit.  This is used
-   to find the executable, Perl library, and include files.  If not
-   specified, it will come from a default optionally specified at configure
-   time (before Verilator was compiled).  It should not be specified if
-   using a pre-compiled Verilator package as the hard-coded value should be
-   correct.  See :ref:`Installation`.
+   The ``VERILATOR_ROOT`` environment variable is used in several places:
+
+   * At ``./configure`` time: If set, it is embedded into the binary, and
+     at runtime if ``VERILATOR_ROOT`` is not set, the embedded value is
+     used for the runtime default.
+
+   * When ``verilator`` is run: If ``VERILATOR_ROOT`` is set it will be
+     used to find the ``verilator_bin`` executable (this is the actual
+     Verilator binary; ``verilator`` is a Perl wrapper). If not set, the
+     ``verilator`` script uses other methods to find ``verilator_bin``
+     (looking in the same directory and falling back to ``$PATH``).
+
+   * When ``make`` is run on the Makefile generated by ``verilator``: The
+     value of ``VERILATOR_ROOT`` (falling back to the value embedded in the
+     binary if not set) is used to find the include files
+     (``include/verilated.mk``).
+
+   If you are using a pre-compiled Verilator package, you should not need
+   to set ``VERILATOR_ROOT`` - the value embedded in the binary should be
+   correct.  In fact this option *does not work* with Verilator packages
+   that have been installed with ``make install``. If a Verilator package
+   has been installed using ``./configure --prefix=/some/path && make
+   install`` and then moved to another location, you cannot use
+   ``VERILATOR_ROOT`` to point to the new version.
+
+   See :ref:`Installation` for more details.
@@ -155,18 +155,6 @@ Summary:
   Specify C++ without SystemC output mode; see also the :vlopt:`--sc`
   option.

-.. option:: --cdc
-
-   Permanently experimental.  Perform some clock domain crossing checks and
-   issue related warnings (CDCRSTLOGIC) and then exit; if warnings other
-   than CDC warnings are needed, make a second run with
-   :vlopt:`--lint-only`.  Additional warning information is also written to
-   the file :file:`<prefix>__cdc.txt`.
-
-   Currently only checks some items that other CDC tools missed; if you are
-   interested in adding more traditional CDC checks, please contact the
-   authors.
-
 .. option:: -CFLAGS <flags>

   Add specified C compiler argument to the generated makefiles. For
@@ -434,7 +422,7 @@ Summary:
   Preprocess the source code, but do not compile, similar to C++
   preprocessing using :command:`gcc -E`.  Output is written to standard
   out.  Beware of enabling debugging messages, as they will also go to
-   standard out.
+   standard out. See :vlopt:`--no-std`, which is implied by this.

   See also :vlopt:`--dump-defines`, :vlopt:`-P`, and
   :vlopt:`--pp-comments` options.
@@ -707,9 +695,10 @@ Summary:
 .. option:: -j [<value>]

   Specify the level of parallelism for :vlopt:`--build` if
-   :vlopt:`--build-jobs` isn't provided. If zero, uses the number of threads
-   in the current hardware. Otherwise, the <value> must be a positive
-   integer specifying the maximum number of parallel build jobs.
+   :vlopt:`--build-jobs` isn't provided, and the internal compilation steps
+   of Verilator if :vlopt:`--verilate-jobs` isn't provided. If zero, uses
+   the number of threads in the current hardware. Otherwise, must be a
+   positive integer specifying the maximum number of parallel build jobs.

 .. option:: --l2-name <value>

@@ -819,6 +808,13 @@ Summary:

   See also :vlopt:`--binary`.

+.. option:: --main-top-name <string>
+
+   Specify the name passed to the Verilated model being constructed, in the
+   generated C++ main() function.
+
+   If the string ``"-"`` is used, no top level scope is added.
+
 .. option:: --max-num-width <value>

   Set the maximum number literal width (e.g., in 1024'd22 this
@@ -1112,6 +1108,18 @@ Summary:
   marking only those signals that need public_flat_rw is typically
   significantly better performing.

+.. option:: --public-depth <level>
+
+   Enables public as with :vlopt:`--public-flat-rw`, but only to the specified depth of modules.
+   It operates at the module maximum level, so if a module's cells are A.B.X and A.X, the
+   a --public-depth 3 must be used to make module X public, and both A.B.X and A.X will be public.
+
+.. option:: --public-params
+
+   Declares all parameters public as if they had
+   :code:`/*verilator public_flat_rd*/`
+   metacomments.
+
 .. option:: -pvalue+<name>=<value>

   Overwrites the given parameter(s) of the top-level module. See
@@ -1201,6 +1209,10 @@ Summary:
   by size (plain :vlopt:`--stats` just gives a count).  See
   :vlopt:`--stats`, which is implied by this.

+.. option:: --no-std
+
+   Prevents parsing standard library.
+
 .. option:: --structs-packed

   Converts all unpacked structures to packed structures, and issues an
@@ -1429,6 +1441,15 @@ Summary:
   execute only the build. This can be useful for rebuilding the Verilated code
   produced by a previous invocation of Verilator.

+.. option:: --verilate-jobs [<value>]
+
+   Specify the level of parallelism for the internal compilation steps of
+   Verilator. If zero, uses the number of threads in the current hardware.
+   Otherwise, must be a positive integer specifying the maximum number of
+   parallel build jobs.
+
+   See also :vlopt:`-j`.
+
 .. option:: +verilog1995ext+<ext>

   Synonym for :vlopt:`+1364-1995ext+\<ext\>`.
@@ -1453,8 +1474,11 @@ Summary:
   them systematically.

   The generated file is in the Verilator Configuration format, see
-   :ref:`Configuration Files`, and can directly be consumed by
-   Verilator. The standard file extension is ".vlt".
+   :ref:`Configuration Files`. The standard file extension is ".vlt".
+   These files can directly be consumed by Verilator, typically by placing
+   the filename as part of the Verilator command line options. Waiver files
+   need to be listed on the command line before listing the files they are
+   waiving.

 .. option:: -Wall

@@ -1500,10 +1524,10 @@ Summary:
 .. option:: -Wno-lint

   Disable all lint-related warning messages, and all style warnings.  This is
-   equivalent to ``-Wno-ALWCOMBORDER -Wno-BSSPACE -Wno-CASEINCOMPLETE
+   equivalent to ``-Wno-ALWCOMBORDER -Wno-ASCRANGE -Wno-BSSPACE -Wno-CASEINCOMPLETE
   -Wno-CASEOVERLAP -Wno-CASEX -Wno-CASTCONST -Wno-CASEWITHX -Wno-CMPCONST -Wno-COLONPLUS
-   -Wno-IMPLICIT -Wno-IMPLICITSTATIC -Wno-LITENDIAN -Wno-PINCONNECTEMPTY
-   -Wno-PINMISSING -Wno-SYNCASYNCNET -Wno-UNDRIVEN -Wno-UNSIGNED
+   -Wno-IMPLICIT -Wno-IMPLICITSTATIC -Wno-PINCONNECTEMPTY
+   -Wno-PINMISSING -Wno-STATICVAR -Wno-SYNCASYNCNET -Wno-UNDRIVEN -Wno-UNSIGNED
   -Wno-UNUSEDGENVAR -Wno-UNUSEDPARAM -Wno-UNUSEDSIGNAL
   -Wno-WIDTH`` plus the list shown for Wno-style.

@@ -1515,7 +1539,7 @@ Summary:

   Disable all code style related warning messages (note that by default, they are
   already disabled).  This is equivalent to ``-Wno-DECLFILENAME -Wno-DEFPARAM
-   -Wno-EOFNEWLINE -Wno-IMPORTSTAR -Wno-INCABSPATH -Wno-PINCONNECTEMPTY
+   -Wno-EOFNEWLINE -Wno-GENUNNAMED -Wno-IMPORTSTAR -Wno-INCABSPATH -Wno-PINCONNECTEMPTY
   -Wno-PINNOCONNECT -Wno-SYNCASYNCNET -Wno-UNDRIVEN
   -Wno-UNUSEDGENVAR -Wno-UNUSEDPARAM -Wno-UNUSEDSIGNAL
   -Wno-VARHIDDEN``.
@@ -1528,6 +1552,8 @@ Summary:
   :command:`gcc -Wpedantic`.  Rarely used, and intended only for strict
   compliance tests.

+   This option changes :option:`ASSIGNIN` from an error to a warning.
+
 .. option:: -Wwarn-<message>

   Enables the specified warning message.
@@ -1536,16 +1562,17 @@ Summary:

   Enable all lint-related warning messages (note that by default, they are already
   enabled), but do not affect style messages.  This is equivalent to
-   ``-Wwarn-ALWCOMBORDER -Wwarn-BSSPACE -Wwarn-CASEINCOMPLETE
-   -Wwarn-CASEOVERLAP -Wwarn-CASEX -Wwarn-CASTCONST -Wwarn-CASEWITHX -Wwarn-CMPCONST
-   -Wwarn-COLONPLUS -Wwarn-IMPLICIT -Wwarn-LITENDIAN
-   -Wwarn-PINMISSING -Wwarn-REALCVT -Wwarn-UNSIGNED -Wwarn-WIDTH``.
+   ``-Wwarn-ALWCOMBORDER -Wwarn-ASCRANGE -Wwarn-BSSPACE -Wwarn-CASEINCOMPLETE
+   -Wwarn-CASEOVERLAP -Wwarn-CASEWITHX -Wwarn-CASEX -Wwarn-CASTCONST -Wwarn-CMPCONST
+   -Wwarn-COLONPLUS -Wwarn-IMPLICIT -Wwarn-IMPLICITSTATIC -Wwarn-LATCH -Wwarn-MISINDENT
+   -Wwarn-NEWERSTD -Wwarn-PINMISSING -Wwarn-REALCVT -Wwarn-STATICVAR -Wwarn-UNSIGNED
+   -Wwarn-WIDTHTRUNC -Wwarn-WIDTHEXPAND -Wwarn-WIDTHXZEXPAND``.

 .. option:: -Wwarn-style

   Enable all code style-related warning messages.  This is equivalent to
   ``-Wwarn ASSIGNDLY -Wwarn-DECLFILENAME -Wwarn-DEFPARAM -Wwarn-EOFNEWLINE
-   -Wwarn-INCABSPATH -Wwarn-PINNOCONNECT -Wwarn-SYNCASYNCNET -Wwarn-UNDRIVEN
+   -Wwarn-GENUNNAMED -Wwarn-INCABSPATH -Wwarn-PINNOCONNECT -Wwarn-SYNCASYNCNET -Wwarn-UNDRIVEN
   -Wwarn-UNUSEDGENVAR -Wwarn-UNUSEDPARAM -Wwarn-UNUSEDSIGNAL -Wwarn-VARHIDDEN``.

 .. option:: --x-assign 0
@@ -6,10 +6,10 @@ verilator_coverage

 Verilator_coverage processes Verilated model-generated coverage reports.

-With --annotate, it reads the specified coverage data file and generates
-annotated source code with coverage metrics annotated.  If multiple
-coverage points exist on the same source code line, additional lines will
-be inserted to report the additional points.
+With `--annotate`, it reads the specified coverage data file and generates
+annotated source code with coverage metrics annotated.  With
+`--annotate-points` the coverage points corresponding to each line are also
+shown.

 Additional Verilog-XL-style standard arguments specify the search paths
 necessary to find the source code on which the coverage analysis was
@@ -58,6 +58,18 @@ to read multiple inputs.  If no data file is specified, by default,
 Specifies the directory name to which source files with annotated coverage
 data should be written.

+Converting from the Verilator coverage data format to the info format is
+lossy; the info will have all forms of coverage merged line coverage, and
+if there are multiple coverage points on a single line they will merge.
+The minimum coverage across all merged points will be used to report
+coverage of the line.
+
+The first character of the line shows a summary of the coverage; this
+allows use of grep to filter the report.  `%` indicates at least one point
+on the line was below the coverage limit.  `+` indicates an
+:option:`--annotate-points` point was at or above the limit, and `-` that
+the point was below the limit.
+
 .. option:: --annotate-all

 Specifies all files should be shown.  By default, only those source files
@@ -70,6 +82,13 @@ coverage hits, then the coverage point will be considered above the
 threshold, and the coverage report will put a "%" to indicate the coverage
 is insufficient.  Defaults to 10.

+.. option:: --annotate-points
+
+Specifies all coverage points should be shown after each line of text.  By
+default, only source lines are shown.
+
+with low coverage are written to the output directory.
+
 .. option:: --help

 Displays a help summary, the program version, and exits.
@@ -446,6 +446,33 @@ or "`ifdef`"'s may break other tools.

   Same as :option:`public_flat_rw` configuration file option.

+.. option:: /*verilator&32;public_[|flat|flat_rd|flat_rw]_on [@(<edge_list>)]*/ (as scope)
+
+   Used to wrap multiple signals and parameters with the respective public attribute.
+   See attribute above for their respective behavior. Cannot be nested. e.g:
+
+      .. code-block:: sv
+
+         /*verilator public_flat_rw_on*/
+         logic clk;
+         logic rst;
+         parameter width = 8;
+         /* verilator public_off*/
+         logic data;
+
+   Is equivalent to:
+
+      .. code-block:: sv
+
+         logic clk /*verilator public_flat_rw*/;
+         logic rst /*verilator public_flat_rw*/;
+         parameter width /*verilator public_flat_rw*/ = 8;
+         logic data;
+
+.. option:: /*verilator&32;public_off*/
+
+   Terminates the previous `/*verilator public*_on*/` directive; see above.
+
 .. option:: /*verilator&32;public_module*/

   Used after a module statement to indicate the module should not be
@@ -356,8 +356,8 @@ Why do I get "undefined reference to \`VL_RAND_RESET_I' or \`Verilated::...'"?
 You need to link your compiled Verilated code against the
 :code:`verilated.cpp` file found in the include directory of the Verilator
 kit.  This is one target in the ``$(VK_GLOBAL_OBJS)`` make variable, which
-should be part of your Makefile's link rule.  If you use :vlopt:`--exe`,
-this is done for you.
+should be part of your Makefile's link rule.  If you use :vlopt:`--exe` or
+:vlopt:`--binary`, this is done for you.


 Is the PLI supported?
@@ -486,7 +486,7 @@ From the sc_main.cpp file, you'd then:

      #include "Vour.h"
      #include "Vour_our.h"
-      cout << "clock is " << top->our->clk << endl;
+      std::cout << "clock is " << top->our->clk << std::endl;


 In this example, clk is a bool you can read or set as any other variable.
@@ -126,8 +126,10 @@ In specific debug and other modes, it also creates:
     - Debugging graph files (from --debug)
   * - *{prefix}{misc}*\ .tree
     - Debugging files (from --debug)
-   * - {mod_prefix}_{each_verilog_base_filename}*\ .vpp
-     - Pre-processed verilog (from --debug)
+   * - *{prefix}*\ __inputs\ .vpp
+     - Pre-processed verilog for all files (from --debug)
+   * - *{prefix}*\ _ *{each_verilog_base_filename}*\ .vpp
+     - Pre-processed verilog for each file (from --debug)

 After running Make, the C++ compiler may produce the following:

@@ -39,7 +39,7 @@ In brief, to install from git:
 ::

   # Prerequisites:
-   #sudo apt-get install git perl python3 make autoconf g++ flex bison ccache
+   #sudo apt-get install git help2man perl python3 make autoconf g++ flex bison ccache
   #sudo apt-get install libgoogle-perftools-dev numactl perl-doc
   #sudo apt-get install libfl2  # Ubuntu only (ignore if gives error)
   #sudo apt-get install libfl-dev  # Ubuntu only (ignore if gives error)
@@ -104,6 +104,7 @@ for good performance:
 ::

   sudo apt-get install ccache  # If present at build, needed for run
+   sudo apt-get install mold  # If present at build, needed for run
   sudo apt-get install libgoogle-perftools-dev numactl

 The following is optional but is recommended for nicely rendered command line
@@ -124,9 +125,9 @@ Those developing Verilator itself may also want these (see internals.rst):

 ::

-   sudo apt-get install gdb graphviz cmake clang clang-format-14 gprof lcov
+   sudo apt-get install clang clang-format-14 cmake gdb gprof graphviz lcov
   sudo apt-get install libclang-dev yapf3
-   sudo pip3 install clang sphinx sphinx_rtd_theme sphinxcontrib-spelling breathe
+   sudo pip3 install clang sphinx sphinx_rtd_theme sphinxcontrib-spelling breathe ruff
   cpan install Pod::Perldoc
   cpan install Parallel::Forker

@@ -201,8 +202,9 @@ These are the installation options:
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

 Our personal favorite is to always run Verilator in-place from its Git
-directory. This allows the easiest experimentation and upgrading, and
-allows many versions of Verilator to co-exist on a system.
+directory (don't run ``make install``). This allows the easiest
+experimentation and upgrading, and allows many versions of Verilator to
+co-exist on a system.

 ::

@@ -211,17 +213,18 @@ allows many versions of Verilator to co-exist on a system.
   ./configure
   # Running will use files from $VERILATOR_ROOT, so no install needed

-Note after installing (below steps), a calling program or shell must set
-the environment variable :option:`VERILATOR_ROOT` to point to this Git
-directory, then execute ``$VERILATOR_ROOT/bin/verilator``, which will find
-the path to all needed files.
+Note after installing (see `Installation`_), a calling program or shell
+must set the environment variable :option:`VERILATOR_ROOT` to point to this
+Git directory, then execute ``$VERILATOR_ROOT/bin/verilator``, which will
+find the path to all needed files.


-2. Install into a specific location
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+2. Install into a Specific Prefix
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

-You may eventually be installing onto a project/company-wide "CAD" tools
-disk that may support multiple versions of every tool. Tell configure the
+You may be an OS package maintainer building a Verilator package, or you
+may eventually be installing onto a project/company-wide "CAD" tools disk
+that may support multiple versions of every tool. Tell configure the
 eventual destination directory name.  We recommend that the destination
 location include the Verilator version name:

@@ -232,7 +235,8 @@ location include the Verilator version name:
   # For the tarball, use the version number instead of git describe
   ./configure --prefix /CAD_DISK/verilator/`git describe | sed "s/verilator_//"`

-Note after installing (below steps), if you use `modulecmd
+Note after installing (see `Installation`_), you need to add the path to
+the ``bin`` directory to your ``PATH``. Or, if you use `modulecmd
 <http://modules.sourceforge.net/>`__, you'll want a module file like the
 following:

@@ -245,23 +249,7 @@ following:
   prepend-path PKG_CONFIG_PATH $install_root/share/pkgconfig


-3. Install into a Specific Path
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-You may eventually install Verilator into a specific installation prefix,
-as most GNU tools support:
-
-::
-
-   unset VERILATOR_ROOT      # if your shell is bash
-   unsetenv VERILATOR_ROOT   # if your shell is csh
-   ./configure --prefix /opt/verilator-VERSION
-
-Then after installing (below steps), you will need to add
-``/opt/verilator-VERSION/bin`` to your ``$PATH`` environment variable.
-
-
-4. Install System Globally
+3. Install System Globally
 ^^^^^^^^^^^^^^^^^^^^^^^^^^

 The final option is to eventually install Verilator globally, using
@@ -273,8 +261,8 @@ configure's default system paths:
   unsetenv VERILATOR_ROOT   # if your shell is csh
   ./configure

-Then after installing (below), the binaries should be in a location
-already in your ``$PATH`` environment variable.
+Then after installing (see `Installation`_), the binaries should be in a
+location already in your ``$PATH`` environment variable.


 Configure
@@ -461,6 +461,10 @@ chandle
  Treated as a "longint"; does not yet warn about operations specified as
  illegal on chandles.

+checker
+  Treated as a "module"; does not yet warn about many constructs illegal
+  inside a checker.
+
 disable
  Disable statements may be used only if the block being disabled is a
  block the disable statement itself is inside.  This was commonly used to
@@ -143,7 +143,7 @@ Functional Coverage
 -------------------

 With :vlopt:`--coverage` or :vlopt:`--coverage-user`, Verilator will
-translate functional coverage points the user has inserted manually win
+translate functional coverage points the user has inserted manually in
 SystemVerilog code through into the Verilated model.

 Currently, all functional coverage points are specified using SystemVerilog
@@ -498,3 +498,20 @@ Clang.  The process in GCC 10 was as follows:
 Clang and GCC also support -fauto-profile, which uses sample-based
 feedback-directed optimization.  See the appropriate compiler
 documentation.
+
+
+.. _Runtime Debugging:
+
+Runtime Debugging
+=================
+
+To debug a Verilated executable, use the standard GNU debugger ``gdb`` or a
+similar tool. Typically you will want to have debugger symbols inserted by
+the compiler, assertions enabled in the C library, and assertions enabled
+in the Verilated library. (These options slow down the executable, so do
+this only when debugging.) To enable this, Verilate with:
+
+    -CFLAGS -ggdb  -LDFLAGS -ggdb  -CFLAGS -DVL_DEBUG=1  -CFLAGS -D_GLIBCXX_DEBUG
+
+The :vlopt:`-CFLAGS` and/or :vlopt:`-LDFLAGS` options pass arguments
+directly to the compiler or linker.
@@ -165,7 +165,7 @@ compiled on the different target system.

 To support this, none of the files that Verilator produces will reference
 any configure-generated build-system-specific files, such as
-:file:`config.h` (which is renamed in Verilator to :file:`config_build.h`
+:file:`config.h` (which is renamed in Verilator to :file:`config_package.h`
 to reduce confusion.)  The disadvantage of this approach is that
 :file:`include/verilatedos.h` must self-detect the requirements of the
 target system, rather than using configure.
@@ -74,7 +74,8 @@ List Of Warnings
 .. option:: Unsupported: ....

   This error indicates that the code uses a Verilog language construct
-   that is not yet supported in Verilator.  See the Limitations chapter.
+   that is not yet supported in Verilator.  See also :ref:`Language
+   Limitations`.


 .. option:: ALWCOMBORDER
@@ -96,6 +97,24 @@ List Of Warnings
   simulate correctly.


+.. option:: ASCRANGE
+
+   .. TODO better example
+
+   Warns that a packed vector is declared with ascending bit range
+   (i.e. [0:7]).  Descending bit range is now the overwhelming standard,
+   and ascending ranges are now thus often due to simple oversight
+   instead of intent (a notable exception is the OpenPOWER code base).
+
+   It also warns that an instance is declared with ascending range
+   (i.e. [0:7] or [7]) and is connected to an N-wide signal.
+   The bits will likely be in the reversed order from what people may expect
+   (i.e., instance [0] will connect to signal bit [N-1] not bit [0]).
+
+   Ignoring this warning will only suppress the lint check; it will
+   simulate correctly.
+
+
 .. option:: ASSIGNDLY

   .. TODO better example
@@ -317,9 +336,11 @@ List Of Warnings

 .. option:: CDCRSTLOGIC

-   With :vlopt:`--cdc` only, it warns that asynchronous flop reset terms come
-   from other than primary inputs or flopped outputs, creating the
-   potential for reset glitches.
+   Historical, never issued since version 5.008.
+
+   Warned with a no longer supported clock domain crossing option that
+   asynchronous flop reset terms came from other than primary inputs or
+   flopped outputs, creating the potential for reset glitches.


 .. option:: CLKDATA
@@ -375,6 +396,16 @@ List Of Warnings
   simulators.


+.. option:: CONSTRAINTIGN
+
+   Warns that Verilator does not support :code:`constraint`,
+   :code:`constraint_mode`, or :code:`rand_mode`, and the construct was are
+   ignored.
+
+   Ignoring this warning may make Verilator randomize() simulations differ
+   from other simulators.
+
+
 .. option:: CONTASSREG

   .. TODO better example
@@ -639,6 +670,52 @@ List Of Warnings
   used as a clock.


+.. option:: GENUNNAMED
+
+   Warns that a generate block was unnamed and "genblk" will be used per
+   IEEE.
+
+   The potential issue is that adding additional generate blocks will
+   renumber the assigned names, which may cause eventual problems with
+   synthesis constraints or other tools that depend on hierarchical paths
+   remaining consistent.
+
+   Blocks that are empty may not be reported with this warning, as no
+   scopes are created for empty blocks, so there is no harm in having them
+   unnamed.
+
+   Disabled by default as this is a code-style warning; it will simulate
+   correctly.
+
+   .. code-block:: sv
+      :linenos:
+      :emphasize-lines: 2
+
+         generate
+            if (PARAM == 1) begin  //<--- Warning
+            end
+
+   Results in:
+
+   .. code-block::
+
+         %Warning-GENUNNAMED: example.v:2:9: Unnamed generate block (IEEE 1800-2017 27.6)
+
+   To fix this assign a label (often with the naming convention prefix of
+   :code:`gen_` or :code:`g_`), for example:
+
+   .. code-block:: sv
+      :linenos:
+      :emphasize-lines: 2
+
+         generate
+            if (PARAM == 1) begin : gen_param_1  //<--- Repaired
+            end
+
+   Other tools with similar warnings: Verible's generate-label, "All
+   generate block statements must have a label."
+
+
 .. option:: HIERBLOCK

   Warns that the top module is marked as a hierarchy block by the
@@ -735,14 +812,17 @@ List Of Warnings

   This is a warning because the static default differs from C++, differs
   from class member function/tasks.  Static is a more dangerous default
-   then automatic as static prevents the function from being reinterant,
+   then automatic as static prevents the function from being reentrant,
   which may be a source of bugs, and/or performance issues.

-   If the function does not require static behavior, change it to "function
-   automatic".
+   If the function is in a module, and does not require static behavior,
+   change it to "function automatic".

-   If the function requires static behavior, change it to "function
-   static".
+   If the function is in a module, and requires static behavior, change it
+   to "function static".
+
+   If the function is in a package, it defaults to static, and label the
+   function's variables as static.

   Ignoring this warning will only suppress the lint check; it will
   simulate correctly.
@@ -842,23 +922,111 @@ List Of Warnings
   Ignoring this warning will only suppress the lint check; it will
   simulate correctly.

+.. option:: LIFETIME
+
+   Error when a variable is referenced in a process that can outlive the process
+   in which it was declared. This can happen when using 'fork..join_none' or
+   'fork..join_any' blocks, which spawn process that can outlive their parents.
+   This error occurs only when Verilator can't replace the reference with a
+   reference to copy of this variable, local to the forked process. For example:
+
+   .. code-block:: sv
+      :linenos:
+      :emphasize-lines: 3
+
+         task foo(int local_var);
+            fork
+               #10 local_var++;
+               #20 $display("local_var = %d", local_var);
+            join_none
+         endtask
+
+   In the example above 'local_var' exists only within scope of 'foo', once foo
+   finishes, the stack frame containing 'i' gets removed. However, the process
+   forked from foo continues, as it contains a delay. After 10 units of time
+   pass, this process attempts to modify 'local_var'. However, this variable no
+   longer exits. It can't be made local to the forked process upon spawning, because
+   it's modified and can be referenced somewhere else, for example in the other
+   forked process, that was delayed by 20 units of time in this example. Thus,
+   there's no viable stack allocation for it.
+
+   In order to fix it, if the intent is not to share the variable's state outside
+   of the process, then create a local copy of the variable.
+
+   For example:
+
+   .. code-block:: sv
+      :linenos:
+      :emphasize-lines: 4
+
+         task foo(int local_var);
+            fork
+               #10 begin
+                  int forked_var = local_var;
+                  forked_var++;
+               end
+               #20 begin
+                  // Note that we are going to print the original value here,
+                  // as `forked_var`is a local copy that was initialized while
+                  // `foo` was still alive.
+                  int forked_var = local_var;
+                  $display("forked_var = %d", forked_var)
+               end
+            join_none
+         endtask
+
+   If you need to share its state, another strategy is to ensure it's allocated
+   statically:
+
+   .. code-block:: sv
+      :linenos:
+      :emphasize-lines: 1
+
+         int static_var;
+
+         task foo();
+            fork
+               #10 static_var++;
+               #20 $display("static_var = %d", static_var);
+            join_none
+         endtask
+
+   However, if you need to be able to instantiate at runtime, the solution would be to
+   wrap it in an object, since the forked process can hold a reference to that object
+   and ensure that the variable stays alive this way:
+
+   .. code-block:: sv
+      :linenos:
+      :emphasize-lines: 2
+
+         class Wrapper;
+            int m_var;
+
+            // Here we implicitly hold a reference to `this`
+            task foo();
+               fork
+                  #10 m_var++;
+                  #20 $display("this.m_var = %d", m_var);
+               join_none
+            endtask
+         endclass
+
+         // Here we explicitly hold a handle to an object
+         task bar(Wrapper wrapper);
+            fork
+               #10 wrapper.m_var++;
+               #20 $display("wrapper.m_var = %d", wrapper.m_var);
+            join_none
+         endtask

 .. option:: LITENDIAN

   .. TODO better example

-   Warns that a packed vector is declared with little endian bit numbering
-   (i.e. [0:7]).  Big endian bit numbering is now the overwhelming
-   standard, and little numbering is now thus often due to simple oversight
-   instead of intent.
-
-   It also warns that an instance is declared with little endian range
-   (i.e. [0:7] or [7]) and is connected to an N-wide signal. Based on IEEE
-   the bits will likely be backward from what people may expect
-   (i.e., instance [0] will connect to signal bit [N-1] not bit [0]).
-
-   Ignoring this warning will only suppress the lint check; it will
-   simulate correctly.
+   The naming of this warning is in contradiction with the common
+   interpretation of little endian. It was therefore renamed to
+   :option:`ASCRANGE`. While :option:`LITENDIAN` remains for
+   backwards compatibility, new projects should use :option:`ASCRANGE`.


 .. option:: MINTYPMAX
@@ -871,6 +1039,51 @@ List Of Warnings
   unsupported. Verilator uses only the typical delay value.


+.. option:: MISINDENT
+
+   Warns that the indentation of a statement is misleading, suggesting the
+   statement is part of a previous :code:`if` or :code:`while` block while
+   it is not.
+
+   Verilator suppresses this check when there is an inconsistent mix of
+   spaces and tabs, as it cannot ensure the width of tabs.  Verilator also
+   ignores blocks with :code:`begin`/:code:`end`, as the :code:`end`
+   visually indicates the earlier statement's end.
+
+   Ignoring this warning will only suppress the lint check; it will
+   simulate correctly.
+
+   For example
+
+   .. code-block:: sv
+      :linenos:
+      :emphasize-lines: 3
+
+         if (something)
+            statement_in_if;
+            statement_not_in_if;  //<--- Warning
+
+   Results in:
+
+   .. code-block::
+
+         %Warning-MISINDENT: example.v:3:9: Misleading indentation
+
+   To fix this repair the indentation to match the correct earlier
+   statement, for example:
+
+   .. code-block:: sv
+      :linenos:
+      :emphasize-lines: 3
+
+         if (something)
+            statement_in_if;
+         statement_not_in_if;  //<--- Repaired
+
+   Other tools with similar warnings: GCC -Wmisleading-indentation,
+   clang-tidy readability-misleading-indentation.
+
+
 .. option:: MODDUP

   .. TODO better example
@@ -949,6 +1162,21 @@ List Of Warnings
   (neither :vlopt:`--timing` nor :vlopt:`--no-timing` option was provided).


+.. option:: NEWERSTD
+
+   Warns that a feature requires a newer standard of Verilog or SystemVerilog
+   than the one specified by the :vlopt:`--language` option. For example, unsized
+   unbased literals (`'0`, `'1`, `'z`, `'x`) require 1800-2005 or later.
+
+   To avoid this warning, use a Verilog or SystemVerilog standard that
+   supports the feature. Alternatively, modify your code to use a different
+   syntax that is supported by the Verilog/SystemVerilog standard specified
+   by the :vlopt:`--language` option.
+
+   Ignoring this warning will only suppress the lint check; it will
+   simulate correctly.
+
+
 .. option:: NOLATCH

   .. TODO better example
@@ -1299,6 +1527,17 @@ List Of Warnings
   * The variable is tristate or bidirectional. (e.g., :code:`inout`).


+.. option:: STATICVAR
+
+   Warns that a static variable declared in a loop with declaration assignment
+   was converted to automatic. Often such variables were intended to
+   instead be declared "automatic".
+
+   Ignoring this warning may make Verilator differ from other simulators,
+   which will treat the variable as static. Verilator may in future versions also
+   treat the variable as static.
+
+
 .. option:: STMTDLY

   Warns that the code has a statement with a delayed time in front of it.
@@ -1790,16 +2029,27 @@ List Of Warnings

   For example, this is a missized index:

-   .. include:: ../../docs/gen/ex_WIDTH_1_faulty.rst
+   .. include:: ../../docs/gen/ex_WIDTHEXPAND_1_faulty.rst

-   Results in:
+   Results in a WIDTHEXPAND warning:

-   .. include:: ../../docs/gen/ex_WIDTH_1_msg.rst
+   .. include:: ../../docs/gen/ex_WIDTHEXPAND_1_msg.rst

   One possible fix:

-   .. include:: ../../docs/gen/ex_WIDTH_1_fixed.rst
+   .. include:: ../../docs/gen/ex_WIDTHEXPAND_1_fixed.rst

+.. option:: WIDTHTRUNC
+
+   A more granular WIDTH warning, for when a value is truncated
+
+.. option:: WIDTHEXPAND
+
+   A more granular WIDTH warning, for when a value is zero expanded
+
+.. option:: WIDTHXZEXPAND
+
+   A more granular WIDTH warning, for when a value is X/Z expanded

 .. option:: WIDTHCONCAT

@@ -628,21 +628,32 @@ coroutines ``co_await`` its ``join`` function, and forked ones call ``done``
 when they're finished. Once the required number of coroutines (set using
 ``setCounter``) finish execution, the forking coroutine is resumed.

-Awaitable Utilities
-~~~~~~~~~~~~~~~~~~~
+``VlForever``
+~~~~~~~~~~~~~

-There are also two small utility awaitable types:
-
-* ``VlNow`` is an awaitable that suspends and immediately resumes coroutines.
-  It is used for forcing a coroutine to be moved onto the heap. See the `Forks`
-  section for more detail.
-* ``VlForever`` is used for blocking a coroutine forever. See the `Timing pass`
-  section for more detail.
+A small utility awaitable type. It allows for blocking a coroutine forever. It
+is currently only used for ``wait`` statements that await a constant false
+condition. See the `Timing Pass` section for more details.

 Timing Pass
 ~~~~~~~~~~~

-The visitor in ``V3Timing.cpp`` transforms each timing control into a ``co_await``.
+There are two visitors in ``V3Timing.cpp``.
+
+The first one, ``TimingSuspendableVisitor``, does not perform any AST
+transformations. It is responsible for marking processes and C++ functions that
+contain timing controls as suspendable. Processes that call suspendable
+functions are also marked as suspendable. Functions that call, are overridden
+by, or override suspendable functions are marked as suspendable as well.
+
+The visitor keeps a dependency graph of functions and processes to handle such
+cases. A function or process is dependent on a function if it calls it. A
+virtual class method is dependent on another class method if it calls it,
+overrides it, or is overriden by it.
+
+The second visitor in ``V3Timing.cpp``, ``TimingControlVisitor``, uses the
+information provided by ``TimingSuspendableVisitor`` and transforms each timing
+control into a ``co_await``.

 * event controls are turned into ``co_await`` on a trigger scheduler's
  ``trigger`` method. The awaited trigger scheduler is the one corresponding to
@@ -674,14 +685,9 @@ Each sub-statement of a ``fork`` is put in an ``AstBegin`` node for easier
 grouping. In a later step, each of these gets transformed into a new, separate
 function. See the `Forks` section for more detail.

-Processes that use awaits are marked as suspendable. Later, during ``V3Sched``,
-they are transformed into coroutines. Functions that use awaits get the return
-type of ``VlCoroutine``. This immediately makes them coroutines. Note that if a
-process calls a function that is a coroutine, the call gets wrapped in an
-await, which means the process itself will be marked as suspendable. A virtual
-function is a coroutine if any of its overriding or overridden functions are
-coroutines. The visitor keeps a dependency graph of functions and processes to
-handle such cases.
+Suspendable functions get the return type of ``VlCoroutine``, which makes them
+coroutines. Later, during ``V3Sched``, suspendable processes are also
+transformed into coroutines.

 Scheduling with timing
 ~~~~~~~~~~~~~~~~~~~~~~
@@ -749,9 +755,7 @@ doesn't suspend the forking process.

 In forked processes, references to local variables are only allowed in
 ``fork..join``, as this is the only case that ensures the lifetime of these
-locals are at least as long as the execution of the forked processes. This is
-where ``VlNow`` is used, to ensure the locals are moved to the heap before they
-are passed by reference to the forked processes.
+locals are at least as long as the execution of the forked processes.


 Multithreaded Mode
@@ -1509,8 +1513,19 @@ debug level 5, with the V3Width.cpp file at level 9.
 --debug
 -------

-When you run with ``--debug``, there are two primary output file types
-placed into the obj_dir, .tree and .dot files.
+When you run with ``--debug``, there are three primary output file types
+placed into the obj_dir, .vpp, .tree and .dot files.
+
+.vpp Output
+-----------
+
+Verilator creates a *{mod_prefix}*\ __inputs\ .vpp file containing all the
+files that were read, filtered by preprocessing. This file can be fed back
+into Verilator, replacing on the command line all of the previous input
+files, to enable simplification of test cases.
+
+Verilator also creates .vpp files for each individual file passed on the
+command line.


 .dot Output
@@ -1807,8 +1822,6 @@ IEEE 1800-2017 6.12 "shortreal"
    Little/no tool support, and easily promoted to real.
 IEEE 1800-2017 11.11 Min, typ, max
    No SDF support, so will always use typical.
-IEEE 1800-2017 11.12 "let"
-    Little/no tool support, makes it difficult to implement parsers.
 IEEE 1800-2017 20.16 Stochastic analysis
    Little industry use.
 IEEE 1800-2017 20.17 PLA modeling
@@ -2110,7 +2123,7 @@ Or in a hand-written C++ wrapper:
 ::

   #ifdef TEST_VERBOSE
-      cout << "Read a=" << a << endl;
+      std::cout << "Read a=" << a << std::endl;
   #endif

 A filename that should be used to check the output results is given with
@@ -6,6 +6,7 @@ Alexandre
 Ami
 Amir
 Anastasiadis
+Anglin
 Anikin
 Antmicro
 Antonin
@@ -42,6 +43,8 @@ Chandan
 Chitlesh
 Christophe
 Cochrane
+Conda
+Corteggiani
 Cuan
 Cygwin
 DErrico
@@ -53,6 +56,7 @@ Das
 Dcache
 Deadman
 Debacker
+Deepa
 Defparams
 Denio
 Deprecations
@@ -96,6 +100,7 @@ Fredieu
 GTKWave
 Galbi
 Gantt
+Garnal
 Gartner
 Gelinek
 Geoff
@@ -188,6 +193,7 @@ Laurens
 Lavino
 Leber
 Leendert
+Lem
 Lesik
 Liland
 Liu
@@ -207,6 +213,7 @@ Matveyenko
 Maupin
 Mdir
 Mednick
+Menküc
 Michiels
 Microsystems
 Milanovic
@@ -223,8 +230,10 @@ Muhlestein
 Multithreaded
 Multithreading
 NOUNOPTFLAT
+NaN
 Nalbantis
 Narayan
+Nassim
 Nauticus
 Newgard
 Nigam
@@ -238,6 +247,7 @@ Olof
 Olofsson
 Oyvind
 PLI
+Palaniappan
 Patricio
 Petr
 Piechotka
@@ -252,6 +262,7 @@ Prateek
 Pre
 Preprocess
 Pretet
+Pretl
 Priyadharshini
 Pullup
 Pulver
@@ -295,6 +306,7 @@ Solomatnikov
 Solt
 Southwell
 Srini
+Srinivasan
 Stamness
 Stephane
 Stoddard
@@ -319,6 +331,7 @@ Thiede
 Thierry
 Thyer
 Tichelaar
+Timi
 Tomov
 Tood
 Topa
@@ -343,6 +356,7 @@ Vdeeptemp
 Vdly
 Vemumtab
 Vemuri
+Venkataramanan
 Veriable
 Verialted
 Verilate
@@ -353,6 +367,7 @@ Verilator
 Verilog
 Vighnesh
 Viktor
+Vilp
 Vm
 Vukobratovic
 Wai
@@ -363,6 +378,7 @@ Wfuture
 Whatson
 Wildman
 Wim
+Wmisleading
 Wno
 Wojciech
 Wolfel
@@ -376,6 +392,7 @@ Xuan
 Xuanqi
 Yazdanbakhsh
 Yi
+Yike
 Yinan
 Yosys
 Yu
@@ -396,6 +413,7 @@ architected
 args
 arrarys
 assertOn
+astgen
 async
 ato
 atoi
@@ -452,12 +470,14 @@ commandArgsPlusMatch
 compilable
 concat
 concats
+conf
 config
 const
 constexpr
 constpool
 coredump
 coroutine
+coroutines
 countbits
 countones
 cout
@@ -512,6 +532,7 @@ dumpportson
 dumpvars
 dut
 dx
+dynarray
 elab
 elike
 elsif
@@ -520,6 +541,7 @@ endcelldefine
 endfunction
 endgenerate
 endian
+endianness
 endif
 endmodule
 endprotect
@@ -541,6 +563,7 @@ exe
 executables
 expr
 extern
+ezchi
 fanin
 fasttrace
 fauto
@@ -585,6 +608,7 @@ genvar
 genvars
 getenv
 getline
+ggdb
 gmake
 gmon
 gotFinish
@@ -635,6 +659,7 @@ lcov
 ld
 leavinel
 len
+libc
 libext
 libgoogle
 libsystemc
@@ -653,7 +678,9 @@ logicals
 longint
 lossy
 lsb
+lubc
 lvalue
+lvalues
 lxt
 macromodule
 makefile
@@ -678,12 +705,15 @@ mtasks
 mulithreaded
 mult
 multidim
+multidriven
 multiinterfaces
 multiline
 multipling
+multipoint
 multithread
 multithreaded
 multithreading
+musl
 mutexes
 mux
 myftptoyman
@@ -714,6 +744,7 @@ ortegon
 oversubscription
 parallelized
 param
+parameterization
 parameterized
 params
 parens
@@ -762,10 +793,12 @@ pulldowns
 pullup
 pvalue
 pwd
+py
 qrq
 radix
 randc
 randcase
+randstate
 rarr
 rdtsc
 reStructuredText
@@ -807,6 +840,7 @@ specparam
 splitme
 spp
 sqrt
+srandom
 src
 srcdir
 srcfile
@@ -838,6 +872,7 @@ svdpi
 swrite
 sys
 systemc
+tenghtt
 testbench
 threadsafe
 threashold
@@ -869,10 +904,12 @@ typedefs
 typename
 uint
 un
+unbased
 undef
 undefineall
 undriven
 ungetc
+unhandled
 uniquified
 unistd
 unlink
@@ -909,6 +946,7 @@ vlt
 vltstd
 vluint
 vpi
+vpiDefName
 vpiLeftRange
 vpiModule
 vpiSize
@@ -938,4 +976,3 @@ ypq
 yurivict
 zdave
 Øyvind
-
@@ -19,7 +19,8 @@
 # cmake ..
 # cmake --build .

-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.12)
+cmake_policy(SET CMP0074 NEW)
 project(cmake_hello_c)

 find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
@@ -19,7 +19,8 @@
 # cmake ..
 # cmake --build .

-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.12)
+cmake_policy(SET CMP0074 NEW)
 project(cmake_hello_sc CXX)

 find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
@@ -19,7 +19,8 @@
 # cmake ..
 # cmake --build .

-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.12)
+cmake_policy(SET CMP0074 NEW)
 project(cmake_protect_lib)

 find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
@@ -19,7 +19,8 @@
 # cmake ..
 # cmake --build .

-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.12)
+cmake_policy(SET CMP0074 NEW)
 project(cmake_tracing_c)

 find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
@@ -19,7 +19,9 @@
 # cmake ..
 # cmake --build .

-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.12)
+cmake_policy(SET CMP0074 NEW)
+
 project(cmake_tracing_sc_example CXX)

 find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
@@ -7,7 +7,7 @@
 //======================================================================

 // SystemC global header
-#include <systemc.h>
+#include <systemc>

 // Include common routines
 #include <verilated.h>
@@ -15,6 +15,8 @@
 // Include model header, generated from Verilating "top.v"
 #include "Vtop.h"

+using namespace sc_core;
+
 int sc_main(int argc, char* argv[]) {
    // See a similar example walkthrough in the verilator manpage.

@@ -31,7 +31,7 @@ CPPFLAGS += -DVL_DEBUG=1
 # Turn on some more compiler lint flags (when configured appropriately)
 # For testing inside Verilator, "configure --enable-ccwarn" will do this
 # automatically; otherwise you may want this unconditionally enabled
-ifeq ($(CFG_WITH_CCWARN),yes)	# Local... Else don't burden users
+ifeq ($(CFG_WITH_CCWARN),yes)  # Local... Else don't burden users
 USER_CPPFLAGS_WALL += -W -Werror -Wall
 endif

@@ -30,7 +30,7 @@ CPPFLAGS += -Wno-deprecated
 # Turn on some more flags (when configured appropriately)
 # For testing inside Verilator, "configure --enable-ccwarn" will do this
 # automatically; otherwise you may want this unconditionally enabled
-ifeq ($(CFG_WITH_CCWARN),yes)	# Local... Else don't burden users
+ifeq ($(CFG_WITH_CCWARN),yes)  # Local... Else don't burden users
 USER_CPPFLAGS_WALL += -W -Werror -Wall
 endif

@@ -10,7 +10,7 @@
 #include <memory>

 // SystemC global header
-#include <systemc.h>
+#include <systemc>

 // Include common routines
 #include <verilated.h>
@@ -23,6 +23,8 @@
 // Include model header, generated from Verilating "top.v"
 #include "Vtop.h"

+using namespace sc_core;
+
 int sc_main(int argc, char* argv[]) {
    // This is a more complicated example, please also see the simpler examples/make_hello_c.

@@ -58,6 +58,7 @@
 #endif

 #ifdef __MINGW32__
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #endif

@@ -131,7 +132,7 @@ void **JenkinsIns(void *base_i, const unsigned char *mem, uint32_t length, uint3
 #define FST_GZIO_LEN                    (32768)
 #define FST_HDR_FOURPACK_DUO_SIZE       (4*1024*1024)

-#if defined(__i386__) || defined(__x86_64__) || defined(_AIX)
+#if defined(__i386__) || defined(__x86_64__) || defined(_AIX) || defined(__aarch64__)
 #define FST_DO_MISALIGNED_OPS
 #endif

@@ -334,26 +335,22 @@ return(NULL);
 /*
 * mmap compatibility
 */
-#if defined __CYGWIN__ || defined __MINGW32__
+#if defined __MINGW32__
 #include <limits.h>
 #define fstMmap(__addr,__len,__prot,__flags,__fd,__off) fstMmap2((__len), (__fd), (__off))
-#define fstMunmap(__addr,__len)                         free(__addr)
+#define fstMunmap(__addr,__len)                         UnmapViewOfFile((LPCVOID)__addr)

 static void *fstMmap2(size_t __len, int __fd, fst_off_t __off)
 {
-(void)__off;
+HANDLE handle = CreateFileMapping((HANDLE)_get_osfhandle(__fd), NULL,
+				  PAGE_READWRITE, (DWORD)(__len >> 32),
+				  (DWORD)__len, NULL);
+if (!handle) { return NULL; }

-unsigned char *pnt = (unsigned char *)malloc(__len);
-fst_off_t cur_offs = lseek(__fd, 0, SEEK_CUR);
-size_t i;
-
-lseek(__fd, 0, SEEK_SET);
-for(i=0;i<__len;i+=SSIZE_MAX)
-        {
-        read(__fd, pnt + i, ((__len - i) >= SSIZE_MAX) ? SSIZE_MAX : (__len - i));
-        }
-lseek(__fd, cur_offs, SEEK_SET);
-return(pnt);
+void *ptr = MapViewOfFileEx(handle, FILE_MAP_READ | FILE_MAP_WRITE,
+			    0, (DWORD)__off, (SIZE_T)__len, (LPVOID)NULL);
+CloseHandle(handle);
+return ptr;
 }
 #else
 #include <sys/mman.h>
@@ -984,14 +981,26 @@ fflush(xc->handle);
 */
 static void fstWriterMmapSanity(void *pnt, const char *file, int line, const char *usage)
 {
-#if !defined(__CYGWIN__) && !defined(__MINGW32__)
-if(pnt == MAP_FAILED)
+if(pnt == NULL
+#ifdef MAP_FAILED
+   || pnt == MAP_FAILED
+#endif
+  )
 	{
 	fprintf(stderr, "fstMmap() assigned to %s failed: errno: %d, file %s, line %d.\n", usage, errno, file, line);
+#if !defined(__MINGW32__)
 	perror("Why");
+#else
+	LPSTR mbuf = NULL;
+	FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM
+		      | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, GetLastError(),
+		      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+		      (LPSTR)&mbuf, 0, NULL);
+	fprintf(stderr, "%s", mbuf);
+	LocalFree(mbuf);
+#endif
 	pnt = NULL;
 	}
-#endif
 }


@@ -1037,34 +1046,11 @@ if(!xc->curval_mem)

 static void fstDestroyMmaps(struct fstWriterContext *xc, int is_closing)
 {
-#if !defined __CYGWIN__ && !defined __MINGW32__
 (void)is_closing;
-#endif

 fstMunmap(xc->valpos_mem, xc->maxhandle * 4 * sizeof(uint32_t));
 xc->valpos_mem = NULL;

-#if defined __CYGWIN__ || defined __MINGW32__
-if(xc->curval_mem)
-        {
-        if(!is_closing) /* need to flush out for next emulated mmap() read */
-                {
-                unsigned char *pnt = xc->curval_mem;
-                int __fd = fileno(xc->curval_handle);
-                fst_off_t cur_offs = lseek(__fd, 0, SEEK_CUR);
-                size_t i;
-                size_t __len = xc->maxvalpos;
-
-                lseek(__fd, 0, SEEK_SET);
-                for(i=0;i<__len;i+=SSIZE_MAX)
-                        {
-                        write(__fd, pnt + i, ((__len - i) >= SSIZE_MAX) ? SSIZE_MAX : (__len - i));
-                        }
-                lseek(__fd, cur_offs, SEEK_SET);
-                }
-        }
-#endif
-
 fstMunmap(xc->curval_mem, xc->maxvalpos);
 xc->curval_mem = NULL;
 }
@@ -2066,7 +2052,8 @@ if(xc && !xc->already_in_close && !xc->already_in_flush)
                int zfd;
                int fourpack_duo = 0;
 #ifndef __MINGW32__
-                char *fnam = (char *)malloc(strlen(xc->filename) + 5 + 1);
+		int fnam_len = strlen(xc->filename) + 5 + 1;
+                char *fnam = (char *)malloc(fnam_len);
 #endif

                fixup_offs = ftello(xc->handle);
@@ -2156,7 +2143,7 @@ if(xc && !xc->already_in_close && !xc->already_in_flush)
                fflush(xc->handle);

 #ifndef __MINGW32__
-                sprintf(fnam, "%s.hier", xc->filename);
+                snprintf(fnam, fnam_len, "%s.hier", xc->filename);
                unlink(fnam);
                free(fnam);
 #endif
@@ -2835,7 +2822,7 @@ if(ctx && name && literal_arr && val_arr && (elem_count != 0))
 	uint32_t i;

 	name_len = strlen(name);
-	elem_count_len = sprintf(elem_count_buf, "%" PRIu32, elem_count);
+	elem_count_len = snprintf(elem_count_buf, 16, "%" PRIu32, elem_count);

 	literal_lens = (unsigned int *)calloc(elem_count, sizeof(unsigned int));
 	val_lens = (unsigned int *)calloc(elem_count, sizeof(unsigned int));
@@ -3412,6 +3399,7 @@ int flat_hier_alloc_len;
 unsigned do_rewind : 1;
 char str_scope_nam[FST_ID_NAM_SIZ+1];
 char str_scope_comp[FST_ID_NAM_SIZ+1];
+char *str_scope_attr;

 unsigned fseek_failed : 1;

@@ -3922,7 +3910,8 @@ int pass_status = 1;
 if(!xc->fh)
        {
        fst_off_t offs_cache = ftello(xc->f);
-        char *fnam = (char *)malloc(strlen(xc->filename) + 6 + 16 + 32 + 1);
+	int fnam_len = strlen(xc->filename) + 6 + 16 + 32 + 1;
+        char *fnam = (char *)malloc(fnam_len);
        unsigned char *mem = (unsigned char *)malloc(FST_GZIO_LEN);
        fst_off_t hl, uclen;
        fst_off_t clen = 0;
@@ -3941,7 +3930,7 @@ if(!xc->fh)
                htyp = xc->contains_hier_section_lz4duo ? FST_BL_HIER_LZ4DUO : FST_BL_HIER_LZ4;
                }

-        sprintf(fnam, "%s.hier_%d_%p", xc->filename, getpid(), (void *)xc);
+        snprintf(fnam, fnam_len, "%s.hier_%d_%p", xc->filename, getpid(), (void *)xc);
        fstReaderFseeko(xc, xc->f, xc->hier_pos, SEEK_SET);
        uclen = fstReaderUint64(xc->f);
 #ifndef __MINGW32__
@@ -4140,7 +4129,7 @@ if(!(isfeof=feof(xc->fh)))
 			cl = 0;
                        while((ch = fgetc(xc->fh)))
                                {
-				if(cl <= FST_ID_NAM_SIZ)
+				if(cl < FST_ID_NAM_SIZ)
 					{
 					pnt[cl++] = ch;
 					}
@@ -4152,7 +4141,7 @@ if(!(isfeof=feof(xc->fh)))
 			cl = 0;
                        while((ch = fgetc(xc->fh)))
                                {
-				if(cl <= FST_ID_NAM_SIZ)
+				if(cl < FST_ID_NAM_SIZ)
 					{
 					pnt[cl++] = ch;
 					}
@@ -4169,15 +4158,19 @@ if(!(isfeof=feof(xc->fh)))
                        xc->hier.htyp = FST_HT_ATTRBEGIN;
                        xc->hier.u.attr.typ = fgetc(xc->fh);
                        xc->hier.u.attr.subtype = fgetc(xc->fh);
-                        xc->hier.u.attr.name = pnt = xc->str_scope_nam;
+			if(!xc->str_scope_attr)
+				{
+				xc->str_scope_attr = (char *)calloc(1, FST_ID_NAM_ATTR_SIZ+1);
+				}
+                        xc->hier.u.attr.name = pnt = xc->str_scope_attr;
 			cl = 0;
                        while((ch = fgetc(xc->fh)))
                                {
-				if(cl <= FST_ID_NAM_SIZ)
+				if(cl < FST_ID_NAM_ATTR_SIZ)
 					{
 					pnt[cl++] = ch;
 					}
-                                }; /* scopename */
+                                }; /* attrname */
 			pnt[cl] = 0;
                        xc->hier.u.attr.name_length = cl;

@@ -4237,7 +4230,7 @@ if(!(isfeof=feof(xc->fh)))
 			cl = 0;
                        while((ch = fgetc(xc->fh)))
                                {
-				if(cl <= FST_ID_NAM_SIZ)
+				if(cl < FST_ID_NAM_SIZ)
 					{
 					pnt[cl++] = ch;
 					}
@@ -4376,7 +4369,7 @@ while(!feof(xc->fh))
 			cl = 0;
                        while((ch = fgetc(xc->fh)))
                                {
-				if(cl <= FST_ID_NAM_ATTR_SIZ)
+				if(cl < FST_ID_NAM_ATTR_SIZ)
 					{
 					pnt[cl++] = ch;
 					}
@@ -4398,7 +4391,7 @@ while(!feof(xc->fh))
 			cl = 0;
                        while((ch = fgetc(xc->fh)))
                                {
-				if(cl <= FST_ID_NAM_ATTR_SIZ)
+				if(cl < FST_ID_NAM_ATTR_SIZ)
 					{
 					pnt[cl++] = ch;
 					}
@@ -4487,7 +4480,7 @@ while(!feof(xc->fh))
 			cl = 0;
                        while((ch = fgetc(xc->fh)))
                                {
-				if(cl <= FST_ID_NAM_ATTR_SIZ)
+				if(cl < FST_ID_NAM_ATTR_SIZ)
 					{
 					pnt[cl++] = ch;
 					}
@@ -4594,15 +4587,17 @@ if(sectype == FST_BL_ZWRAPPER)
        int zfd;
        int flen = strlen(xc->filename);
        char *hf;
+	int hf_len;

        seclen = fstReaderUint64(xc->f);
        uclen = fstReaderUint64(xc->f);

        if(!seclen) return(0); /* not finished compressing, this is a failed read */

-        hf = (char *)calloc(1, flen + 16 + 32 + 1);
+	hf_len = flen + 16 + 32 + 1;
+        hf = (char *)calloc(1, hf_len);

-        sprintf(hf, "%s.upk_%d_%p", xc->filename, getpid(), (void *)xc);
+        snprintf(hf, hf_len, "%s.upk_%d_%p", xc->filename, getpid(), (void *)xc);
        fcomp = fopen(hf, "w+b");
        if(!fcomp)
                {
@@ -4974,6 +4969,7 @@ if(xc)
        free(xc->signal_typs); xc->signal_typs = NULL;
        free(xc->signal_lens); xc->signal_lens = NULL;
        free(xc->filename); xc->filename = NULL;
+	free(xc->str_scope_attr); xc->str_scope_attr = NULL;

        if(xc->fh)
                {
@@ -5197,16 +5193,16 @@ for(;;)

                                if(beg_tim)
                                        {
-					if(dumpvars_state == 1) { wx_len = sprintf(wx_buf, "$end\n"); fstWritex(xc, wx_buf, wx_len); dumpvars_state = 2; }
-                                        wx_len = sprintf(wx_buf, "#%" PRIu64 "\n", beg_tim);
+					if(dumpvars_state == 1) { wx_len = snprintf(wx_buf, 32, "$end\n"); fstWritex(xc, wx_buf, wx_len); dumpvars_state = 2; }
+                                        wx_len = snprintf(wx_buf, 32, "#%" PRIu64 "\n", beg_tim);
                                        fstWritex(xc, wx_buf, wx_len);
-					if(!dumpvars_state) { wx_len = sprintf(wx_buf, "$dumpvars\n"); fstWritex(xc, wx_buf, wx_len); dumpvars_state = 1; }
+					if(!dumpvars_state) { wx_len = snprintf(wx_buf, 32, "$dumpvars\n"); fstWritex(xc, wx_buf, wx_len); dumpvars_state = 1; }
                                        }
                                if((xc->num_blackouts)&&(cur_blackout != xc->num_blackouts))
                                        {
                                        if(beg_tim == xc->blackout_times[cur_blackout])
                                                {
-                                                wx_len = sprintf(wx_buf, "$dump%s $end\n", (xc->blackout_activity[cur_blackout++]) ? "on" : "off");
+                                                wx_len = snprintf(wx_buf, 32, "$dump%s $end\n", (xc->blackout_activity[cur_blackout++]) ? "on" : "off");
                                                fstWritex(xc, wx_buf, wx_len);
                                                }
                                        }
@@ -5340,7 +5336,7 @@ for(;;)
                                                                                        clone_d[j] = srcdata[7-j];
                                                                                        }
                                                                                }
-                                                                        sprintf((char *)xc->temp_signal_value_buf, "%.16g", d);
+                                                                        snprintf((char *)xc->temp_signal_value_buf, xc->longest_signal_value_len + 1, "%.16g", d);
                                                                        value_change_callback(user_callback_data_pointer, beg_tim, idx+1, xc->temp_signal_value_buf);
                                                                        }
                                                                }
@@ -5368,7 +5364,7 @@ for(;;)
                                                                                }

                                                                        fstVcdID(vcdid_buf, idx+1);
-                                                                        wx_len = sprintf(wx_buf, "r%.16g %s\n", d, vcdid_buf);
+                                                                        wx_len = snprintf(wx_buf, 64, "r%.16g %s\n", d, vcdid_buf);
                                                                        fstWritex(xc, wx_buf, wx_len);
                                                                        }
                                                                }
@@ -5633,16 +5629,16 @@ for(;;)
                                                }
                                        }

-				if(dumpvars_state == 1) { wx_len = sprintf(wx_buf, "$end\n"); fstWritex(xc, wx_buf, wx_len); dumpvars_state = 2; }
-                                wx_len = sprintf(wx_buf, "#%" PRIu64 "\n", time_table[i]);
+				if(dumpvars_state == 1) { wx_len = snprintf(wx_buf, 32, "$end\n"); fstWritex(xc, wx_buf, wx_len); dumpvars_state = 2; }
+                                wx_len = snprintf(wx_buf, 32, "#%" PRIu64 "\n", time_table[i]);
                                fstWritex(xc, wx_buf, wx_len);
-				if(!dumpvars_state) { wx_len = sprintf(wx_buf, "$dumpvars\n"); fstWritex(xc, wx_buf, wx_len); dumpvars_state = 1; }
+				if(!dumpvars_state) { wx_len = snprintf(wx_buf, 32, "$dumpvars\n"); fstWritex(xc, wx_buf, wx_len); dumpvars_state = 1; }

                                if((xc->num_blackouts)&&(cur_blackout != xc->num_blackouts))
                                        {
                                        if(time_table[i] == xc->blackout_times[cur_blackout])
                                                {
-                                                wx_len = sprintf(wx_buf, "$dump%s $end\n", (xc->blackout_activity[cur_blackout++]) ? "on" : "off");
+                                                wx_len = snprintf(wx_buf, 32, "$dump%s $end\n", (xc->blackout_activity[cur_blackout++]) ? "on" : "off");
                                                fstWritex(xc, wx_buf, wx_len);
                                                }
                                        }
@@ -5892,7 +5888,7 @@ for(;;)
                                                                        clone_d[j] = srcdata[7-j];
                                                                        }
                                                                }
-                                                        sprintf((char *)xc->temp_signal_value_buf, "%.16g", d);
+                                                        snprintf((char *)xc->temp_signal_value_buf, xc->longest_signal_value_len + 1, "%.16g", d);
                                                        value_change_callback(user_callback_data_pointer, time_table[i], idx+1, xc->temp_signal_value_buf);
                                                        }
                                                }
@@ -5918,7 +5914,7 @@ for(;;)
                                                                        }
                                                                }

-                                                        wx_len = sprintf(wx_buf, "r%.16g", d);
+                                                        wx_len = snprintf(wx_buf, 32, "r%.16g", d);
                                                        fstWritex(xc, wx_buf, wx_len);
                                                        }
                                                }
@@ -6024,7 +6020,7 @@ if(xc->signal_lens[facidx] == 1)
                                }
                        }

-                sprintf((char *)buf, "%.16g", d);
+                snprintf((char *)buf, 32, "%.16g", d); /* this will write 18 bytes */
                }
        }

@@ -6616,7 +6612,7 @@ if(xc->signal_lens[facidx] == 1)
                                        }
                                }

-                        sprintf(buf, "r%.16g", d);
+                        snprintf(buf, 32, "r%.16g", d); /* this will write 19 bytes */
                        return(buf);
                        }
                }
@@ -232,9 +232,9 @@ std::string _vl_string_vprintf(const char* formatp, va_list ap) VL_MT_SAFE {
    char* const bufp = new char[len + 1];
    VL_VSNPRINTF(bufp, len + 1, formatp, ap);

-    std::string out{bufp, len};  // Not const to allow move optimization
+    std::string result{bufp, len};  // Not const to allow move optimization
    delete[] bufp;
-    return out;
+    return result;
 }

 uint64_t _vl_dbg_sequence_number() VL_MT_SAFE {
@@ -255,30 +255,89 @@ 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);
-    const std::string out = _vl_string_vprintf(formatp, ap);
+    const std::string result = _vl_string_vprintf(formatp, ap);
    va_end(ap);
    // printf("-imm-V{t%d,%" PRId64 "}%s", VL_THREAD_ID(), _vl_dbg_sequence_number(),
-    // out.c_str());
+    // result.c_str());

    // Using VL_PRINTF not VL_PRINTF_MT so that we can call VL_DBG_MSGF
    // from within the guts of the thread execution machinery (and it goes
    // to the screen and not into the queues we're debugging)
-    VL_PRINTF("-V{t%u,%" PRIu64 "}%s", VL_THREAD_ID(), _vl_dbg_sequence_number(), out.c_str());
+    VL_PRINTF("-V{t%u,%" PRIu64 "}%s", VL_THREAD_ID(), _vl_dbg_sequence_number(), result.c_str());
 }

 void VL_PRINTF_MT(const char* formatp, ...) VL_MT_SAFE {
    va_list ap;
    va_start(ap, formatp);
-    const std::string out = _vl_string_vprintf(formatp, ap);
+    const std::string result = _vl_string_vprintf(formatp, ap);
    va_end(ap);
    VerilatedThreadMsgQueue::post(VerilatedMsg{[=]() {  //
-        VL_PRINTF("%s", out.c_str());
+        VL_PRINTF("%s", result.c_str());
    }});
 }

 //===========================================================================
 // Random -- Mostly called at init time, so not inline.

+VlRNG::VlRNG() VL_MT_SAFE {
+    // Starting point for this new class comes from the global RNG
+    VlRNG& fromr = vl_thread_rng();
+    m_state = fromr.m_state;
+    // Advance the *source* so it can later generate a new number
+    // Xoroshiro128+ algorithm
+    fromr.m_state[1] ^= fromr.m_state[0];
+    fromr.m_state[0] = (((fromr.m_state[0] << 55) | (fromr.m_state[0] >> 9)) ^ fromr.m_state[1]
+                        ^ (fromr.m_state[1] << 14));
+    fromr.m_state[1] = (fromr.m_state[1] << 36) | (fromr.m_state[1] >> 28);
+}
+uint64_t VlRNG::rand64() VL_MT_UNSAFE {
+    // Xoroshiro128+ algorithm
+    const uint64_t result = m_state[0] + m_state[1];
+    m_state[1] ^= m_state[0];
+    m_state[0] = (((m_state[0] << 55) | (m_state[0] >> 9)) ^ m_state[1] ^ (m_state[1] << 14));
+    m_state[1] = (m_state[1] << 36) | (m_state[1] >> 28);
+    return result;
+}
+uint64_t VlRNG::vl_thread_rng_rand64() VL_MT_SAFE {
+    VlRNG& fromr = vl_thread_rng();
+    const uint64_t result = fromr.m_state[0] + fromr.m_state[1];
+    fromr.m_state[1] ^= fromr.m_state[0];
+    fromr.m_state[0] = (((fromr.m_state[0] << 55) | (fromr.m_state[0] >> 9)) ^ fromr.m_state[1]
+                        ^ (fromr.m_state[1] << 14));
+    fromr.m_state[1] = (fromr.m_state[1] << 36) | (fromr.m_state[1] >> 28);
+    return result;
+}
+void VlRNG::srandom(uint64_t n) VL_MT_UNSAFE {
+    m_state[0] = n;
+    m_state[1] = m_state[0];
+    // Fix state as algorithm is slow to randomize if many zeros
+    // This causes a loss of ~ 1 bit of seed entropy, no big deal
+    if (VL_COUNTONES_I(m_state[0]) < 10) m_state[0] = ~m_state[0];
+    if (VL_COUNTONES_I(m_state[1]) < 10) m_state[1] = ~m_state[1];
+}
+std::string VlRNG::get_randstate() const VL_MT_UNSAFE {
+    // Though not stated in IEEE, assumption is the string must be printable
+    const char* const stateCharsp = reinterpret_cast<const char*>(&m_state);
+    static_assert(sizeof(m_state) == 16, "");
+    std::string result{"R00112233445566770011223344556677"};
+    for (int i = 0; i < sizeof(m_state); ++i) {
+        result[1 + i * 2] = 'a' + ((stateCharsp[i] >> 4) & 15);
+        result[1 + i * 2 + 1] = 'a' + (stateCharsp[i] & 15);
+    }
+    return result;
+}
+void VlRNG::set_randstate(const std::string& state) VL_MT_UNSAFE {
+    if (VL_UNLIKELY((state.length() != 1 + 2 * sizeof(m_state)) || (state[0] != 'R'))) {
+        VL_PRINTF_MT("%%Warning: set_randstate ignored as state string not from get_randstate\n");
+        return;
+    }
+    char* const stateCharsp = reinterpret_cast<char*>(&m_state);
+    for (int i = 0; i < sizeof(m_state); ++i) {
+        stateCharsp[i]
+            = (((state[1 + i * 2] - 'a') & 15) << 4) | ((state[1 + i * 2 + 1] - 'a') & 15);
+    }
+}
+
 static uint32_t vl_sys_rand32() VL_MT_SAFE {
    // Return random 32-bits using system library.
    // Used only to construct seed for Verilator's PRNG.
@@ -292,27 +351,23 @@ static uint32_t vl_sys_rand32() VL_MT_SAFE {
 #endif
 }

-uint64_t vl_rand64() VL_MT_SAFE {
-    static thread_local uint64_t t_state[2];
+VlRNG& VlRNG::vl_thread_rng() VL_MT_SAFE {
+    static thread_local VlRNG t_rng{0};
    static thread_local uint32_t t_seedEpoch = 0;
    // For speed, we use a thread-local epoch number to know when to reseed
    // A thread always belongs to a single context, so this works out ok
    if (VL_UNLIKELY(t_seedEpoch != VerilatedContextImp::randSeedEpoch())) {
        // Set epoch before state, to avoid race case with new seeding
        t_seedEpoch = VerilatedContextImp::randSeedEpoch();
-        t_state[0] = Verilated::threadContextp()->impp()->randSeedDefault64();
-        t_state[1] = t_state[0];
+        // Same as srandom() but here as needs to be VL_MT_SAFE
+        t_rng.m_state[0] = Verilated::threadContextp()->impp()->randSeedDefault64();
+        t_rng.m_state[1] = t_rng.m_state[0];
        // Fix state as algorithm is slow to randomize if many zeros
        // This causes a loss of ~ 1 bit of seed entropy, no big deal
-        if (VL_COUNTONES_I(t_state[0]) < 10) t_state[0] = ~t_state[0];
-        if (VL_COUNTONES_I(t_state[1]) < 10) t_state[1] = ~t_state[1];
+        if (VL_COUNTONES_I(t_rng.m_state[0]) < 10) t_rng.m_state[0] = ~t_rng.m_state[0];
+        if (VL_COUNTONES_I(t_rng.m_state[1]) < 10) t_rng.m_state[1] = ~t_rng.m_state[1];
    }
-    // Xoroshiro128+ algorithm
-    const uint64_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);
-    return result;
+    return t_rng;
 }

 WDataOutP VL_RANDOM_W(int obits, WDataOutP outwp) VL_MT_SAFE {
@@ -321,6 +376,12 @@ WDataOutP VL_RANDOM_W(int obits, WDataOutP outwp) VL_MT_SAFE {
    return outwp;
 }

+WDataOutP VL_RANDOM_RNG_W(VlRNG& rngr, int obits, WDataOutP outwp) VL_MT_UNSAFE {
+    for (int i = 0; i < VL_WORDS_I(obits); ++i) outwp[i] = rngr.rand64();
+    // Last word is unclean
+    return outwp;
+}
+
 IData VL_RANDOM_SEEDED_II(IData& seedr) VL_MT_SAFE {
    // $random - seed is a new seed to apply, then we return new seed
    Verilated::threadContextp()->randSeed(static_cast<int>(seedr));
@@ -518,12 +579,12 @@ 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;
-    QData out = 1ULL;
+    QData result = 1ULL;
    for (int bit = 0; bit < rbits; ++bit) {
        if (bit > 0) power = power * power;
-        if (VL_BITISSET_W(rwp, bit)) out *= power;
+        if (VL_BITISSET_W(rwp, bit)) result *= power;
    }
-    return out;
+    return result;
 }

 WDataOutP VL_POWSS_WWW(int obits, int, int rbits, WDataOutP owp, const WDataInP lwp,
@@ -645,7 +706,7 @@ std::string VL_DECIMAL_NW(int width, const WDataInP lwp) VL_MT_SAFE {
 }

 template <typename T>
-std::string _vl_vsformat_time(char* tmp, T ld, int timeunit, bool left, size_t width) {
+std::string _vl_vsformat_time(char* tmp, T ld, int timeunit, bool left, size_t width) VL_MT_SAFE {
    const VerilatedContextImp* const ctxImpp = Verilated::threadContextp()->impp();
    const std::string suffix = ctxImpp->timeFormatSuffix();
    const int userUnits = ctxImpp->timeFormatUnits();  // 0..-15
@@ -1312,16 +1373,18 @@ IData _vl_vsscanf(FILE* fp,  // If a fscanf
                    *p = t_tmp;
                } else if (obits <= VL_BYTESIZE) {
                    CData* const p = va_arg(ap, CData*);
-                    *p = owp[0];
+                    *p = VL_CLEAN_II(obits, obits, owp[0]);
                } else if (obits <= VL_SHORTSIZE) {
                    SData* const p = va_arg(ap, SData*);
-                    *p = owp[0];
+                    *p = VL_CLEAN_II(obits, obits, owp[0]);
                } else if (obits <= VL_IDATASIZE) {
                    IData* const p = va_arg(ap, IData*);
-                    *p = owp[0];
+                    *p = VL_CLEAN_II(obits, obits, owp[0]);
                } else if (obits <= VL_QUADSIZE) {
                    QData* const p = va_arg(ap, QData*);
-                    *p = VL_SET_QW(owp);
+                    *p = VL_CLEAN_QQ(obits, obits, VL_SET_QW(owp));
+                } else {
+                    _vl_clean_inplace_w(obits, owp);
                }
            }
            }  // switch
@@ -1411,6 +1474,12 @@ IData VL_FERROR_IN(IData, std::string& outputr) VL_MT_SAFE {
    outputr = std::string{::std::strerror(ret)};
    return ret;
 }
+IData VL_FERROR_IW(IData fpi, int obits, WDataOutP outwp) VL_MT_SAFE {
+    std::string output;
+    const IData ret = VL_FERROR_IN(fpi, output /*ref*/);
+    _vl_string_to_vint(obits, outwp, output.length(), output.c_str());
+    return ret;
+}

 IData VL_FOPEN_NN(const std::string& filename, const std::string& mode) {
    return Verilated::threadContextp()->impp()->fdNew(filename.c_str(), mode.c_str());
@@ -1645,15 +1714,15 @@ std::string VL_STACKTRACE_N() VL_MT_SAFE {
    // cppcheck-suppress knownConditionTrueFalse
    if (!strings) return "Unable to backtrace\n";

-    std::string out = "Backtrace:\n";
-    for (int j = 0; j < nptrs; j++) out += std::string{strings[j]} + std::string{"\n"};
+    std::string result = "Backtrace:\n";
+    for (int j = 0; j < nptrs; j++) result += std::string{strings[j]} + std::string{"\n"};
    free(strings);
-    return out;
+    return result;
 }

 void VL_STACKTRACE() VL_MT_SAFE {
-    const std::string out = VL_STACKTRACE_N();
-    VL_PRINTF("%s", out.c_str());
+    const std::string result = VL_STACKTRACE_N();
+    VL_PRINTF("%s", result.c_str());
 }

 IData VL_SYSTEM_IQ(QData lhs) VL_MT_SAFE {
@@ -1793,19 +1862,20 @@ 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(double lhs) { return VL_SFORMATF_NX("%d", 64, lhs); }
 std::string VL_TO_STRING_W(int words, const WDataInP obj) {
    return VL_SFORMATF_NX("'h%0x", words * VL_EDATASIZE, obj);
 }

 std::string VL_TOLOWER_NN(const std::string& ld) VL_PURE {
-    std::string out = ld;
-    for (auto& cr : out) cr = std::tolower(cr);
-    return out;
+    std::string result = ld;
+    for (auto& cr : result) cr = std::tolower(cr);
+    return result;
 }
 std::string VL_TOUPPER_NN(const std::string& ld) VL_PURE {
-    std::string out = ld;
-    for (auto& cr : out) cr = std::toupper(cr);
-    return out;
+    std::string result = ld;
+    for (auto& cr : result) cr = std::toupper(cr);
+    return result;
 }

 std::string VL_CVT_PACK_STR_NW(int lwords, const WDataInP lwp) VL_PURE {
@@ -1826,6 +1896,12 @@ std::string VL_CVT_PACK_STR_NW(int lwords, const WDataInP lwp) VL_PURE {
    return std::string{destout, len};
 }

+std::string VL_CVT_PACK_STR_ND(const VlQueue<std::string>& q) VL_PURE {
+    std::string output;
+    for (const std::string& s : q) output += s;
+    return output;
+}
+
 std::string VL_PUTC_N(const std::string& lhs, IData rhs, CData ths) VL_PURE {
    std::string lstring = lhs;
    const int32_t rhs_s = rhs;  // To signed value
@@ -1861,6 +1937,32 @@ IData VL_ATOI_N(const std::string& str, int base) VL_PURE {
    if (errno != 0) v = 0;
    return static_cast<IData>(v);
 }
+IData VL_NTOI_I(int obits, const std::string& str) VL_PURE { return VL_NTOI_Q(obits, str); }
+QData VL_NTOI_Q(int obits, const std::string& str) VL_PURE {
+    QData out = 0;
+    const char* const datap = str.data();
+    int pos = static_cast<int>(str.length()) - 1;
+    int bit = 0;
+    while (bit < obits && pos >= 0) {
+        out |= static_cast<QData>(datap[pos]) << VL_BITBIT_Q(bit);
+        bit += 8;
+        --pos;
+    }
+    return out & VL_MASK_Q(obits);
+}
+void VL_NTOI_W(int obits, WDataOutP owp, const std::string& str) VL_PURE {
+    const int words = VL_WORDS_I(obits);
+    for (int i = 0; i < words; ++i) owp[i] = 0;
+    const char* const datap = str.data();
+    int pos = static_cast<int>(str.length()) - 1;
+    int bit = 0;
+    while (bit < obits && pos >= 0) {
+        owp[VL_BITWORD_I(bit)] |= static_cast<EData>(datap[pos]) << VL_BITBIT_I(bit);
+        bit += 8;
+        --pos;
+    }
+    owp[words - 1] &= VL_MASK_E(obits);
+}

 //===========================================================================
 // Readmem/writemem
@@ -2948,7 +3050,7 @@ VerilatedModule::~VerilatedModule() {
 // VerilatedVar:: Methods

 // cppcheck-suppress unusedFunction  // Used by applications
-uint32_t VerilatedVarProps::entSize() const {
+uint32_t VerilatedVarProps::entSize() const VL_MT_SAFE {
    uint32_t size = 1;
    switch (vltype()) {
    case VLVT_PTR: size = sizeof(void*); break;
@@ -2968,7 +3070,7 @@ size_t VerilatedVarProps::totalSize() const {
    return size;
 }

-void* VerilatedVarProps::datapAdjustIndex(void* datap, int dim, int indx) const {
+void* VerilatedVarProps::datapAdjustIndex(void* datap, int dim, int indx) const VL_MT_SAFE {
    if (VL_UNLIKELY(dim <= 0 || dim > udims())) return nullptr;
    if (VL_UNLIKELY(indx < low(dim) || indx > high(dim))) return nullptr;
    const int indxAdj = indx - low(dim);
@@ -3087,7 +3189,7 @@ void* VerilatedScope::exportFindNullError(int funcnum) VL_MT_SAFE {
    return nullptr;
 }

-void* VerilatedScope::exportFindError(int funcnum) const {
+void* VerilatedScope::exportFindError(int funcnum) const VL_MT_SAFE {
    // Slowpath - Called only when find has failed
    const std::string msg
        = (std::string{"Testbench C called '"} + VerilatedImp::exportName(funcnum)
@@ -3132,15 +3234,18 @@ void VerilatedAssertOneThread::fatal_different() VL_MT_SAFE {
 //===========================================================================
 // VlDeleter:: Methods

-void VlDeleter::deleteAll() {
+void VlDeleter::deleteAll() VL_EXCLUDES(m_mutex) VL_EXCLUDES(m_deleteMutex) VL_MT_SAFE {
    while (true) {
-        VerilatedLockGuard lock{m_mutex};
-        if (m_newGarbage.empty()) break;
-        VerilatedLockGuard deleteLock{m_deleteMutex};
-        std::swap(m_newGarbage, m_toDelete);
-        lock.unlock();  // So destructors can enqueue new objects
+        {
+            VerilatedLockGuard lock{m_mutex};
+            if (m_newGarbage.empty()) break;
+            m_deleteMutex.lock();
+            std::swap(m_newGarbage, m_toDelete);
+            // m_mutex is unlocked here, so destructors can enqueue new objects
+        }
        for (VlDeletable* const objp : m_toDelete) delete objp;
        m_toDelete.clear();
+        m_deleteMutex.unlock();
    }
 }

@@ -30,6 +30,13 @@
 #ifndef VERILATOR_VERILATED_H_
 #define VERILATOR_VERILATED_H_
 #define VERILATOR_VERILATED_H_INTERNAL_
+#ifdef VERILATOR_INTERNAL_
+// This file contains definition of VerilationMutex that should
+// only be used by verilated code. Verilator itself should use
+// mutex from V3Mutex.h. Make sure this file isn't included in
+// verilator code.
+#error "verilated.h should only be included in verilated code"
+#endif

 // clang-format off
 #include "verilatedos.h"
@@ -47,6 +54,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <deque>
+#include <functional>
 #include <map>
 #include <memory>
 #include <set>
@@ -141,6 +149,15 @@ enum VerilatedVarFlags {
    VLVF_DPI_CLAY = (1 << 10)  // DPI compatible C standard layout
 };

+//=============================================================================
+// Utility functions
+
+template <size_t N>
+inline constexpr size_t roundUpToMultipleOf(size_t value) {
+    static_assert((N & (N - 1)) == 0, "'N' must be a power of 2");
+    return (value + N - 1) & ~(N - 1);
+}
+
 //=========================================================================
 // Mutex and threading support

@@ -158,6 +175,7 @@ public:
    /// Construct mutex (without locking it)
    VerilatedMutex() = default;
    ~VerilatedMutex() = default;
+    VL_UNCOPYABLE(VerilatedMutex);
    const VerilatedMutex& operator!() const { return *this; }  // For -fthread_safety
    /// Acquire/lock mutex
    void lock() VL_ACQUIRE() VL_MT_SAFE {
@@ -175,6 +193,19 @@ public:
    void unlock() VL_RELEASE() VL_MT_SAFE { m_mutex.unlock(); }
    /// Try to acquire mutex.  Returns true on success, and false on failure.
    bool try_lock() VL_TRY_ACQUIRE(true) VL_MT_SAFE { return m_mutex.try_lock(); }
+    /// Acquire/lock mutex and check for stop request
+    /// It tries to lock the mutex and if it fails, it check if stop request was send.
+    /// It returns after locking mutex.
+    /// This function should be extracted to V3ThreadPool, but due to clang thread-safety
+    /// limitations it needs to be placed here.
+    void lockCheckStopRequest(std::function<void()> checkStopRequestFunction)
+        VL_ACQUIRE() VL_MT_SAFE {
+        while (true) {
+            checkStopRequestFunction();
+            if (m_mutex.try_lock()) return;
+            VL_CPU_RELAX();
+        }
+    }
 };

 /// Lock guard for mutex (ala std::unique_lock), wrapped to allow -fthread_safety checks
@@ -188,14 +219,10 @@ public:
    /// Construct and hold given mutex lock until destruction or unlock()
    explicit VerilatedLockGuard(VerilatedMutex& mutexr) VL_ACQUIRE(mutexr) VL_MT_SAFE
        : m_mutexr(mutexr) {  // Need () or GCC 4.8 false warning
-        m_mutexr.lock();
+        mutexr.lock();
    }
    /// Destruct and unlock the mutex
    ~VerilatedLockGuard() VL_RELEASE() { m_mutexr.unlock(); }
-    /// Unlock the mutex
-    void lock() VL_ACQUIRE() VL_MT_SAFE { m_mutexr.lock(); }
-    /// Lock the mutex
-    void unlock() VL_RELEASE() VL_MT_SAFE { m_mutexr.unlock(); }
 };

 // Internals: Remember the calling thread at construction time, and make
@@ -584,6 +611,7 @@ public:  // But for internal use only
    VerilatedEvalMsgQueue* __Vm_evalMsgQp;
    explicit VerilatedSyms(VerilatedContext* contextp);  // Pass null for default context
    ~VerilatedSyms();
+    VL_UNCOPYABLE(VerilatedSyms);
 };

 //===========================================================================
@@ -624,7 +652,7 @@ public:  // But internals only - called from VerilatedModule's
    VerilatedVar* varFind(const char* namep) const VL_MT_SAFE_POSTINIT;
    VerilatedVarNameMap* varsp() const VL_MT_SAFE_POSTINIT { return m_varsp; }
    void scopeDump() const;
-    void* exportFindError(int funcnum) const;
+    void* exportFindError(int funcnum) const VL_MT_SAFE;
    static void* exportFindNullError(int funcnum) VL_MT_SAFE;
    static void* exportFind(const VerilatedScope* scopep, int funcnum) VL_MT_SAFE {
        if (VL_UNLIKELY(!scopep)) return exportFindNullError(funcnum);
@@ -922,18 +950,18 @@ void VerilatedContext::timeprecision(int value) VL_MT_SAFE {
        const VerilatedLockGuard lock{m_mutex};
        m_s.m_timeprecision = value;
 #if VM_SC
-        const sc_time sc_res = sc_get_time_resolution();
-        if (sc_res == sc_time(1, SC_SEC)) {
+        const sc_core::sc_time sc_res = sc_core::sc_get_time_resolution();
+        if (sc_res == sc_core::sc_time(1, sc_core::SC_SEC)) {
            sc_prec = 0;
-        } else if (sc_res == sc_time(1, SC_MS)) {
+        } else if (sc_res == sc_core::sc_time(1, sc_core::SC_MS)) {
            sc_prec = 3;
-        } else if (sc_res == sc_time(1, SC_US)) {
+        } else if (sc_res == sc_core::sc_time(1, sc_core::SC_US)) {
            sc_prec = 6;
-        } else if (sc_res == sc_time(1, SC_NS)) {
+        } else if (sc_res == sc_core::sc_time(1, sc_core::SC_NS)) {
            sc_prec = 9;
-        } else if (sc_res == sc_time(1, SC_PS)) {
+        } else if (sc_res == sc_core::sc_time(1, sc_core::SC_PS)) {
            sc_prec = 12;
-        } else if (sc_res == sc_time(1, SC_FS)) {
+        } else if (sc_res == sc_core::sc_time(1, sc_core::SC_FS)) {
            sc_prec = 15;
        }
 #endif
@@ -31,6 +31,8 @@ CFG_CXXFLAGS_NO_UNUSED = @CFG_CXXFLAGS_NO_UNUSED@
 CFG_CXXFLAGS_WEXTRA = @CFG_CXXFLAGS_WEXTRA@
 # Compiler flags that enable coroutine support
 CFG_CXXFLAGS_COROUTINES = @CFG_CXXFLAGS_COROUTINES@
+# Linker flags
+CFG_LDFLAGS_VERILATED = @CFG_LDFLAGS_VERILATED@
 # Linker libraries for multithreading
 CFG_LDLIBS_THREADS = @CFG_LDLIBS_THREADS@

@@ -67,7 +69,7 @@ VK_CPPFLAGS_ALWAYS += \
 		-DVM_TRACE_VCD=$(VM_TRACE_VCD) \
 		$(CFG_CXXFLAGS_NO_UNUSED) \

-ifeq ($(CFG_WITH_CCWARN),yes)	# Local... Else don't burden users
+ifeq ($(CFG_WITH_CCWARN),yes)  # Local... Else don't burden users
 VK_CPPFLAGS_WALL += -Wall $(CFG_CXXFLAGS_WEXTRA) -Werror
 endif

@@ -77,6 +79,8 @@ VPATH += ..
 VPATH += $(VERILATOR_ROOT)/include
 VPATH += $(VERILATOR_ROOT)/include/vltstd

+LDFLAGS  += $(CFG_LDFLAGS_VERILATED)
+
 #OPT = -ggdb -DPRINTINITSTR -DDETECTCHANGE
 #OPT = -ggdb -DPRINTINITSTR
 CPPFLAGS += $(OPT)
@@ -235,14 +239,16 @@ $(VM_PREFIX)__ALL.a: $(VK_OBJS) $(VM_HIER_LIBS)
 ifneq ($(VM_DEFAULT_RULES),0)
 # Anything not in $(VK_SLOW_OBJS) or $(VK_GLOBAL_OBJS), including verilated.o
 # and user files passed on the Verilator command line use this rule.
+# We put OPT_FAST/OPT_SLOW/OPT_GLOBAL before the other flags to
+# allow USER_CPPFLAGS to override them
 %.o: %.cpp
-	$(OBJCACHE) $(CXX) $(CXXFLAGS) $(CPPFLAGS) $(OPT_FAST) -c -o $@ $<
+	$(OBJCACHE) $(CXX) $(OPT_FAST) $(CXXFLAGS) $(CPPFLAGS) -c -o $@ $<

 $(VK_SLOW_OBJS): %.o: %.cpp
-	$(OBJCACHE) $(CXX) $(CXXFLAGS) $(CPPFLAGS) $(OPT_SLOW) -c -o $@ $<
+	$(OBJCACHE) $(CXX) $(OPT_SLOW) $(CXXFLAGS) $(CPPFLAGS) -c -o $@ $<

 $(VK_GLOBAL_OBJS): %.o: %.cpp
-	$(OBJCACHE) $(CXX) $(CXXFLAGS) $(CPPFLAGS) $(OPT_GLOBAL) -c -o $@ $<
+	$(OBJCACHE) $(CXX) $(OPT_GLOBAL) $(CXXFLAGS) $(CPPFLAGS) -c -o $@ $<
 endif

 #Default rule embedded in make:
@@ -208,11 +208,11 @@ private:
        // Forward to . so we have a whole word
        const std::string suffix = *bpost ? std::string{bpost + 1} : "";

-        std::string out = prefix + "*" + suffix;
+        std::string result = prefix + "*" + suffix;

-        // cout << "\nch pre="<<prefix<<"  s="<<suffix<<"\nch a="<<old<<"\nch b="<<add
-        // <<"\ncho="<<out<<endl;
-        return out;
+        // std::cout << "\nch pre=" << prefix << "  s=" << suffix << "\nch a="
+        // << old << "\nch b=" << add << "\ncho=" << result << std::endl;
+        return result;
    }
    bool itemMatchesString(VerilatedCovImpItem* itemp, const std::string& match)
        VL_REQUIRES(m_mutex) {
@@ -316,7 +316,7 @@ public:
        valps[2] = page_default.c_str();

        // Keys -> strings
-        std::string keys[VerilatedCovConst::MAX_KEYS];
+        std::array<std::string, VerilatedCovConst::MAX_KEYS> keys;
        for (int i = 0; i < VerilatedCovConst::MAX_KEYS; ++i) {
            if (ckeyps[i] && ckeyps[i][0]) keys[i] = ckeyps[i];
        }
@@ -337,7 +337,7 @@ public:
            const std::string key = keys[i];
            if (!keys[i].empty()) {
                const std::string val = valps[i];
-                // cout<<"   "<<__FUNCTION__<<"  "<<key<<" = "<<val<<endl;
+                // std::cout << "   " << __FUNCTION__ << "  " << key << " = " << val << std::endl;
                m_insertp->m_keys[addKeynum] = valueIndex(key);
                m_insertp->m_vals[addKeynum] = valueIndex(val);
                ++addKeynum;
@@ -19,8 +19,8 @@
 ///
 //=============================================================================

-#ifndef VERILATOR_VERILATED_VCD_SC_H_
-#define VERILATOR_VERILATED_VCD_SC_H_
+#ifndef VERILATOR_VERILATED_FST_SC_H_
+#define VERILATOR_VERILATED_FST_SC_H_

 #include "verilatedos.h"

@@ -36,23 +36,23 @@
 /// with the SystemC simulation kernel, just like a SystemC-documented
 /// trace format.

-class VerilatedFstSc final : sc_trace_file, public VerilatedFstC {
+class VerilatedFstSc final : sc_core::sc_trace_file, public VerilatedFstC {
    // CONSTRUCTORS
    VL_UNCOPYABLE(VerilatedFstSc);

 public:
    /// Construct a SC trace object, and register with the SystemC kernel
    VerilatedFstSc() {
-        sc_get_curr_simcontext()->add_trace_file(this);
+        sc_core::sc_get_curr_simcontext()->add_trace_file(this);
        // 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.
-        const sc_time t1sec{1, SC_SEC};
+        const sc_core::sc_time t1sec{1, sc_core::SC_SEC};
        if (t1sec.to_default_time_units() != 0) {
-            const sc_time tunits{1.0 / t1sec.to_default_time_units(), SC_SEC};
+            const sc_core::sc_time tunits{1.0 / t1sec.to_default_time_units(), sc_core::SC_SEC};
            spTrace()->set_time_unit(tunits.to_string());
        }
-        spTrace()->set_time_resolution(sc_get_time_resolution().to_string());
+        spTrace()->set_time_resolution(sc_core::sc_get_time_resolution().to_string());
    }
    /// Destruct, flush, and close the dump
    ~VerilatedFstSc() override { close(); }
@@ -60,7 +60,7 @@ public:
    // METHODS - for SC kernel
    // Called by SystemC simulate()
    void cycle(bool delta_cycle) override {
-        if (!delta_cycle) this->dump(sc_time_stamp().to_double());
+        if (!delta_cycle) this->dump(sc_core::sc_time_stamp().to_double());
    }

    // Override VerilatedFstC. Must be called after starting simulation.
@@ -79,7 +79,7 @@ private:
    // Cadence Incisive has these as abstract functions so we must create them
    void set_time_unit(int exponent10_seconds) override {}  // deprecated
 #endif
-    void set_time_unit(double v, sc_time_unit tu) override {}  // LCOV_EXCL_LINE
+    void set_time_unit(double v, sc_core::sc_time_unit tu) override {}  // LCOV_EXCL_LINE

    //--------------------------------------------------
    // SystemC 2.1.v1
@@ -96,8 +96,8 @@ private:
    // Formatting matches that of sc_trace.h
    // LCOV_EXCL_START
 #if (SYSTEMC_VERSION >= 20171012)
-    DECL_TRACE_METHOD_A( sc_event )
-    DECL_TRACE_METHOD_A( sc_time )
+    DECL_TRACE_METHOD_A( sc_core::sc_event )
+    DECL_TRACE_METHOD_A( sc_core::sc_time )
 #endif

    DECL_TRACE_METHOD_A( bool )
@@ -152,9 +152,11 @@ extern const char* vl_mc_scan_plusargs(const char* prefixp) VL_MT_SAFE;  // PLIi
 // Base macros

 // Return true if data[bit] set; not 0/1 return, but 0/non-zero return.
+// Arguments must not have side effects
 #define VL_BITISSETLIMIT_W(data, width, bit) (((bit) < (width)) && VL_BITISSET_W(data, bit))

 // Shift appropriate word by bit. Does not account for wrapping between two words
+// Argument 'bit' must not have side effects
 #define VL_BITRSHIFT_W(data, bit) ((data)[VL_BITWORD_E(bit)] >> VL_BITBIT_E(bit))

 // Create two 32-bit words from quadword
@@ -260,7 +262,7 @@ extern void _vl_debug_print_w(int lbits, WDataInP const iwp) VL_MT_SAFE;
 #if defined(SYSTEMC_VERSION)
 /// Return current simulation time
 // Already defined: extern sc_time sc_time_stamp();
-inline uint64_t vl_time_stamp64() VL_MT_SAFE { return sc_time_stamp().value(); }
+inline uint64_t vl_time_stamp64() VL_MT_SAFE { return sc_core::sc_time_stamp().value(); }
 #else  // Non-SystemC
 # if !defined(VL_TIME_CONTEXT) && !defined(VL_NO_LEGACY)
 #  ifdef VL_TIME_STAMP64
@@ -758,6 +760,7 @@ static inline IData VL_ONEHOT0_W(int words, WDataInP const lwp) VL_PURE {

 static inline IData VL_CLOG2_I(IData lhs) VL_PURE {
    // There are faster algorithms, or fls GCC4 builtins, but rarely used
+    // In C++20 there will be std::bit_width(lhs) - 1
    if (VL_UNLIKELY(!lhs)) return 0;
    --lhs;
    int shifts = 0;
@@ -953,11 +956,19 @@ static inline void VL_NEGATE_INPLACE_W(int words, WDataOutP owp_lwp) VL_MT_SAFE
 // EMIT_RULE: VL_MUL:    oclean=dirty; lclean==clean; rclean==clean;
 // EMIT_RULE: VL_DIV:    oclean=dirty; lclean==clean; rclean==clean;
 // EMIT_RULE: VL_MODDIV: oclean=dirty; lclean==clean; rclean==clean;
-#define VL_DIV_III(lbits, lhs, rhs) (((rhs) == 0) ? 0 : (lhs) / (rhs))
-#define VL_DIV_QQQ(lbits, lhs, rhs) (((rhs) == 0) ? 0 : (lhs) / (rhs))
+static inline IData VL_DIV_III(int lbits, IData lhs, IData rhs) {
+    return (rhs == 0) ? 0 : lhs / rhs;
+}
+static inline QData VL_DIV_QQQ(int lbits, QData lhs, QData rhs) {
+    return (rhs == 0) ? 0 : lhs / rhs;
+}
 #define VL_DIV_WWW(lbits, owp, lwp, rwp) (_vl_moddiv_w(lbits, owp, lwp, rwp, 0))
-#define VL_MODDIV_III(lbits, lhs, rhs) (((rhs) == 0) ? 0 : (lhs) % (rhs))
-#define VL_MODDIV_QQQ(lbits, lhs, rhs) (((rhs) == 0) ? 0 : (lhs) % (rhs))
+static inline IData VL_MODDIV_III(int lbits, IData lhs, IData rhs) {
+    return (rhs == 0) ? 0 : lhs % rhs;
+}
+static inline QData VL_MODDIV_QQQ(int lbits, QData lhs, QData rhs) {
+    return (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 const lwp,
@@ -2164,6 +2175,9 @@ inline IData VL_CMP_NN(const std::string& lhs, const std::string& rhs, bool igno
 }

 extern IData VL_ATOI_N(const std::string& str, int base) VL_PURE;
+extern IData VL_NTOI_I(int obits, const std::string& str) VL_PURE;
+extern QData VL_NTOI_Q(int obits, const std::string& str) VL_PURE;
+extern void VL_NTOI_W(int obits, WDataOutP owp, const std::string& str) VL_PURE;

 extern IData VL_FGETS_NI(std::string& dest, IData fpi) VL_MT_SAFE;

@@ -2182,6 +2196,7 @@ extern IData VL_DIST_UNIFORM(IData& seedr, IData ustart, IData uend) VL_MT_SAFE;
 // Conversion functions

 extern std::string VL_CVT_PACK_STR_NW(int lwords, const WDataInP lwp) VL_PURE;
+extern std::string VL_CVT_PACK_STR_ND(const VlQueue<std::string>& q) VL_PURE;
 inline std::string VL_CVT_PACK_STR_NQ(QData lhs) VL_PURE {
    VlWide<VL_WQ_WORDS_E> lw;
    VL_SET_WQ(lw, lhs);
@@ -2198,10 +2213,10 @@ inline std::string VL_CONCATN_NNN(const std::string& lhs, const std::string& rhs
    return lhs + rhs;
 }
 inline std::string VL_REPLICATEN_NNQ(const std::string& lhs, IData rep) VL_PURE {
-    std::string out;
-    out.reserve(lhs.length() * rep);
-    for (unsigned times = 0; times < rep; ++times) out += lhs;
-    return out;
+    std::string result;
+    result.reserve(lhs.length() * rep);
+    for (unsigned times = 0; times < rep; ++times) result += lhs;
+    return result;
 }
 inline std::string VL_REPLICATEN_NNI(const std::string& lhs, IData rep) VL_PURE {
    return VL_REPLICATEN_NNQ(lhs, rep);
@@ -2212,6 +2227,7 @@ extern std::string VL_TOLOWER_NN(const std::string& ld) VL_PURE;
 extern std::string VL_TOUPPER_NN(const std::string& ld) VL_PURE;

 extern IData VL_FERROR_IN(IData fpi, std::string& outputr) VL_MT_SAFE;
+extern IData VL_FERROR_IW(IData fpi, int obits, WDataOutP outwp) VL_MT_SAFE;
 extern IData VL_FOPEN_NN(const std::string& filename, const std::string& mode) VL_MT_SAFE;
 extern IData VL_FOPEN_MCD_N(const std::string& filename) VL_MT_SAFE;
 extern void VL_READMEM_N(bool hex, int bits, QData depth, int array_lsb,
@@ -1,31 +0,0 @@
-// -*- mode: C++; c-file-style: "cc-mode" -*-
-//*************************************************************************
-//
-// Code available from: https://verilator.org
-//
-// Copyright 2010-2023 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
-//
-//*************************************************************************
-///
-/// \file
-/// \brief Verilated old string and data-type header
-///
-/// This file is deprecated, and provided for backwards compatibility.
-/// Include verilated.h instead.
-///
-//*************************************************************************
-
-#ifndef VERILATOR_VERILATED_HEAVY_H_
-#define VERILATOR_VERILATED_HEAVY_H_
-
-#ifdef VL_NO_LEGACY
-#error "Include <verilated.h> instead of <verilated_heavy.h>"
-#endif
-
-#include "verilated.h"
-
-#endif  // Guard
@@ -148,7 +148,7 @@ public:
 private:
    VL_UNCOPYABLE(VerilatedThreadMsgQueue);
    // METHODS
-    static VerilatedThreadMsgQueue& threadton() {
+    static VerilatedThreadMsgQueue& threadton() VL_MT_SAFE {
        static thread_local VerilatedThreadMsgQueue t_s;
        return t_s;
    }
@@ -29,7 +29,7 @@

 #include "verilatedos.h"

-#include "systemc.h"
+#include <systemc>

 //=============================================================================
 // For \internal use, get a pointer to m_data in the sc_bv_base class,
@@ -37,9 +37,9 @@
 // use cast magic to get at it.  Saves patching get_datap in SystemC.
 #define VL_SC_BV_DATAP(bv) (VlScBvExposer::sp_datap(bv))
 // This class is thread safe (though most of SystemC is not).
-class VlScBvExposer final : public sc_bv_base {
+class VlScBvExposer final : public sc_dt::sc_bv_base {
 public:
-    static const uint32_t* sp_datap(const sc_bv_base& base) VL_MT_SAFE {
+    static const uint32_t* sp_datap(const sc_dt::sc_bv_base& base) VL_MT_SAFE {
        return static_cast<const VlScBvExposer*>(&base)->sp_datatp();
    }
    const uint32_t* sp_datatp() const { return reinterpret_cast<uint32_t*>(m_data); }
@@ -26,92 +26,167 @@
 // verilator lint_off TIMESCALEMOD
 // verilator lint_off UNUSEDSIGNAL
 package std;
-    class mailbox #(type T);
-        protected int m_bound;
-        protected T m_queue[$];
+   class mailbox #(type T);
+      protected int m_bound;
+      protected T m_queue[$];

-        function new(int bound = 0);
-            m_bound = bound;
-        endfunction
+      function new(int bound = 0);
+         m_bound = bound;
+      endfunction

-        function int num();
-            return m_queue.size();
-        endfunction
+      function int num();
+         return m_queue.size();
+      endfunction

-        task put(T message);
-    `ifdef VERILATOR_TIMING
-            if (m_bound != 0)
-                wait (m_queue.size() < m_bound);
+      task put(T message);
+`ifdef VERILATOR_TIMING
+         if (m_bound != 0)
+            wait (m_queue.size() < m_bound);
+         m_queue.push_back(message);
+`endif
+      endtask
+
+      function int try_put(T message);
+         if (num() < m_bound) begin
            m_queue.push_back(message);
-    `endif
-        endtask
+            return 1;
+         end
+         return 0;
+      endfunction

-        function int try_put(T message);
-            if (num() < m_bound) begin
-                m_queue.push_back(message);
-                return 1;
-            end
-            return 0;
-        endfunction
+      task get(ref T message);
+`ifdef VERILATOR_TIMING
+         wait (m_queue.size() > 0);
+         message = m_queue.pop_front();
+`endif
+      endtask

-        task get(ref T message);
-    `ifdef VERILATOR_TIMING
-            wait (m_queue.size() > 0);
+      function int try_get(ref T message);
+         if (num() > 0) begin
            message = m_queue.pop_front();
-    `endif
-        endtask
+            return 1;
+         end
+         return 0;
+      endfunction

-        function int try_get(ref T message);
-            if (num() > 0) begin
-                message = m_queue.pop_front();
-                return 1;
-            end
-            return 0;
-        endfunction
+      task peek(ref T message);
+`ifdef VERILATOR_TIMING
+         wait (m_queue.size() > 0);
+         message = m_queue[0];
+`endif
+      endtask

-        task peek(ref T message);
-    `ifdef VERILATOR_TIMING
-            wait (m_queue.size() > 0);
+      function int try_peek(ref T message);
+         if (num() > 0) begin
            message = m_queue[0];
-    `endif
-        endtask
+            return 1;
+         end
+         return 0;
+      endfunction
+   endclass

-        function int try_peek(ref T message);
-            if (num() > 0) begin
-                message = m_queue[0];
-                return 1;
-            end
-            return 0;
-        endfunction
-    endclass
+   class semaphore;
+      protected int m_keyCount;

-    class semaphore;
-        protected int m_keyCount;
+      function new(int keyCount = 0);
+         m_keyCount = keyCount;
+      endfunction

-        function new(int keyCount = 0);
-            m_keyCount = keyCount;
-        endfunction
+      function void put(int keyCount = 1);
+         m_keyCount += keyCount;
+      endfunction

-        function void put(int keyCount = 1);
-            m_keyCount += keyCount;
-        endfunction
+      task get(int keyCount = 1);
+`ifdef VERILATOR_TIMING
+         wait (m_keyCount >= keyCount);
+         m_keyCount -= keyCount;
+`endif
+      endtask

-        task get(int keyCount = 1);
-    `ifdef VERILATOR_TIMING
-            wait (m_keyCount >= keyCount);
+      function int try_get(int keyCount = 1);
+         if (m_keyCount >= keyCount) begin
            m_keyCount -= keyCount;
-    `endif
-        endtask
+            return 1;
+         end
+         return 0;
+      endfunction
+   endclass

-        function int try_get(int keyCount = 1);
-            if (m_keyCount >= keyCount) begin
-                m_keyCount -= keyCount;
-                return 1;
-            end
-            return 0;
-        endfunction
-    endclass
+   class process;
+      typedef enum {
+         FINISHED  = 0,
+         RUNNING   = 1,
+         WAITING   = 2,
+         SUSPENDED = 3,
+         KILLED    = 4
+      } state;
+
+`ifdef VERILATOR_TIMING
+      // Width visitor changes it to VlProcessRef
+      protected chandle m_process;
+`endif
+
+      static function process self();
+         process p = new;
+`ifdef VERILATOR_TIMING
+         $c(p.m_process, " = vlProcess;");
+`endif
+         return p;
+      endfunction
+
+      protected function void set_status(state s);
+`ifdef VERILATOR_TIMING
+         $c(m_process, "->state(", s, ");");
+`endif
+      endfunction
+
+      function state status();
+`ifdef VERILATOR_TIMING
+         return state'($c(m_process, "->state()"));
+`else
+         return RUNNING;
+`endif
+      endfunction
+
+      function void kill();
+         set_status(KILLED);
+      endfunction
+
+      function void suspend();
+         $error("std::process::suspend() not supported");
+      endfunction
+
+      function void resume();
+         set_status(RUNNING);
+      endfunction
+
+      task await();
+`ifdef VERILATOR_TIMING
+         wait (status() == FINISHED || status() == KILLED);
+`endif
+      endtask
+
+      // When really implemented, srandom must operate on the process, but for
+      // now rely on the srandom() that is automatically generated for all
+      // classes.
+      //
+      // function void srandom(int seed);
+      // endfunction
+
+      // The methods below work only if set_randstate is never applied to
+      // a state string created before another such string. Full support
+      // could use VlRNG class to store the state per process in VlProcess
+      // objects.
+      function string get_randstate();
+         string s;
+
+         s.itoa($random);  // Get a random number
+         set_randstate(s);  // Pretend it's the state of RNG
+         return s;
+      endfunction
+
+      function void set_randstate(string s);
+         $urandom(s.atoi());  // Set the seed using a string
+      endfunction
+   endclass
 endpackage
-
-// verilator lint_off IMPORTSTAR
-import std::*;
@@ -137,35 +137,35 @@ public:
    ~VerilatedVarProps() = default;
    // METHODS
    bool magicOk() const { return m_magic == MAGIC; }
-    VerilatedVarType vltype() const { return m_vltype; }
+    VerilatedVarType vltype() const VL_MT_SAFE { return m_vltype; }
    VerilatedVarFlags vldir() const {
        return static_cast<VerilatedVarFlags>(static_cast<int>(m_vlflags) & VLVF_MASK_DIR);
    }
-    uint32_t entSize() const;
+    uint32_t entSize() const VL_MT_SAFE;
    bool isPublicRW() const { return ((m_vlflags & VLVF_PUB_RW) != 0); }
    // DPI compatible C standard layout
    bool isDpiCLayout() const { return ((m_vlflags & VLVF_DPI_CLAY) != 0); }
-    int udims() const { return m_udims; }
+    int udims() const VL_MT_SAFE { return m_udims; }
    int dims() const { return m_pdims + m_udims; }
-    const VerilatedRange& packed() const { return m_packed; }
+    const VerilatedRange& packed() const VL_MT_SAFE { return m_packed; }
    const VerilatedRange& unpacked() const { return m_unpacked[0]; }
    // DPI accessors
-    int left(int dim) const {
+    int left(int dim) const VL_MT_SAFE {
        return dim == 0                                ? m_packed.left()
               : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].left()
                                                       : 0;
    }
-    int right(int dim) const {
+    int right(int dim) const VL_MT_SAFE {
        return dim == 0                                ? m_packed.right()
               : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].right()
                                                       : 0;
    }
-    int low(int dim) const {
+    int low(int dim) const VL_MT_SAFE {
        return dim == 0                                ? m_packed.low()
               : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].low()
                                                       : 0;
    }
-    int high(int dim) const {
+    int high(int dim) const VL_MT_SAFE {
        return dim == 0                                ? m_packed.high()
               : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].high()
                                                       : 0;
@@ -175,7 +175,7 @@ public:
               : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].increment()
                                                       : 0;
    }
-    int elements(int dim) const {
+    int elements(int dim) const VL_MT_SAFE {
        return dim == 0                                ? m_packed.elements()
               : VL_LIKELY(dim >= 1 && dim <= udims()) ? m_unpacked[dim - 1].elements()
                                                       : 0;
@@ -183,7 +183,7 @@ public:
    // Total size in bytes (note DPI limited to 4GB)
    size_t totalSize() const;
    // Adjust a data pointer to access a given array element, NULL if something goes bad
-    void* datapAdjustIndex(void* datap, int dim, int indx) const;
+    void* datapAdjustIndex(void* datap, int dim, int indx) const VL_MT_SAFE;
 };

 //===========================================================================
@@ -203,22 +203,22 @@ public:
        , m_datap{const_cast<void*>(datap)} {}
    ~VerilatedDpiOpenVar() = default;
    // METHODS
-    void* datap() const { return m_datap; }
+    void* datap() const VL_MT_SAFE { return m_datap; }
    // METHODS - from VerilatedVarProps
    bool magicOk() const { return m_propsp->magicOk(); }
    VerilatedVarType vltype() const { return m_propsp->vltype(); }
    bool isDpiStdLayout() const { return m_propsp->isDpiCLayout(); }
    const VerilatedRange& packed() const { return m_propsp->packed(); }
    const VerilatedRange& unpacked() const { return m_propsp->unpacked(); }
-    int udims() const { return m_propsp->udims(); }
-    int left(int dim) const { return m_propsp->left(dim); }
-    int right(int dim) const { return m_propsp->right(dim); }
+    int udims() const VL_MT_SAFE { return m_propsp->udims(); }
+    int left(int dim) const VL_MT_SAFE { return m_propsp->left(dim); }
+    int right(int dim) const VL_MT_SAFE { return m_propsp->right(dim); }
    int low(int dim) const { return m_propsp->low(dim); }
    int high(int dim) const { return m_propsp->high(dim); }
    int increment(int dim) const { return m_propsp->increment(dim); }
    int elements(int dim) const { return m_propsp->elements(dim); }
    size_t totalSize() const { return m_propsp->totalSize(); }
-    void* datapAdjustIndex(void* datap, int dim, int indx) const {
+    void* datapAdjustIndex(void* datap, int dim, int indx) const VL_MT_SAFE {
        return m_propsp->datapAdjustIndex(datap, dim, indx);
    }
 };
@@ -173,7 +173,7 @@ public:
        VerilatedLockGuard lock{m_mutex};
        while (m_ready.empty()) {
            m_waiting = true;
-            m_cv.wait(lock);
+            m_cv.wait(m_mutex);
        }
        m_waiting = false;
        // As noted above this is inefficient if our ready list is ever
@@ -30,7 +30,16 @@ void VlCoroutineHandle::resume() {
    // main process
    if (VL_LIKELY(m_coro)) {
        VL_DEBUG_IF(VL_DBG_MSGF("             Resuming: "); dump(););
-        m_coro();
+        if (m_process) {  // If process state is managed with std::process
+            if (m_process->state() == VlProcess::KILLED) {
+                m_coro.destroy();
+            } else {
+                m_process->state(VlProcess::RUNNING);
+                m_coro();
+            }
+        } else {
+            m_coro();
+        }
        m_coro = nullptr;
    }
 }
@@ -95,8 +104,9 @@ void VlTriggerScheduler::resume(const char* eventDescription) {
    VL_DEBUG_IF(dump(eventDescription);
                VL_DBG_MSGF("         Resuming processes waiting for %s\n", eventDescription););
 #endif
-    for (auto& susp : m_ready) susp.resume();
-    m_ready.clear();
+    std::swap(m_ready, m_resumeQueue);
+    for (VlCoroutineHandle& coro : m_resumeQueue) coro.resume();
+    m_resumeQueue.clear();
    commit(eventDescription);
 }

@@ -96,25 +96,38 @@ class VlCoroutineHandle final {

    // MEMBERS
    std::coroutine_handle<> m_coro;  // The wrapped coroutine handle
+    VlProcessRef m_process;  // Data of the suspended process, null if not needed
    VlFileLineDebug m_fileline;

 public:
    // CONSTRUCTORS
    // Construct
-    VlCoroutineHandle()
-        : m_coro{nullptr} {}
-    VlCoroutineHandle(std::coroutine_handle<> coro, VlFileLineDebug fileline)
+    VlCoroutineHandle(VlProcessRef process)
+        : m_coro{nullptr}
+        , m_process{process} {
+        if (m_process) m_process->state(VlProcess::WAITING);
+    }
+    VlCoroutineHandle(std::coroutine_handle<> coro, VlProcessRef process, VlFileLineDebug fileline)
        : m_coro{coro}
-        , m_fileline{fileline} {}
+        , m_process{process}
+        , m_fileline{fileline} {
+        if (m_process) m_process->state(VlProcess::WAITING);
+    }
    // Move the handle, leaving a nullptr
    VlCoroutineHandle(VlCoroutineHandle&& moved)
        : m_coro{std::exchange(moved.m_coro, nullptr)}
+        , m_process{moved.m_process}
        , m_fileline{moved.m_fileline} {}
    // Destroy if the handle isn't null
    ~VlCoroutineHandle() {
        // Usually these coroutines should get resumed; we only need to clean up if we destroy a
        // model with some coroutines suspended
-        if (VL_UNLIKELY(m_coro)) m_coro.destroy();
+        if (VL_UNLIKELY(m_coro)) {
+            m_coro.destroy();
+            if (m_process && m_process->state() != VlProcess::KILLED) {
+                m_process->state(VlProcess::FINISHED);
+            }
+        }
    }
    // METHODS
    // Move the handle, leaving a null handle
@@ -122,7 +135,7 @@ public:
        m_coro = std::exchange(moved.m_coro, nullptr);
        return *this;
    }
-    // Resume the coroutine if the handle isn't null
+    // Resume the coroutine if the handle isn't null and the process isn't killed
    void resume();
 #ifdef VL_DEBUG
    void dump() const;
@@ -173,21 +186,24 @@ public:
    void dump() const;
 #endif
    // Used by coroutines for co_awaiting a certain simulation time
-    auto delay(uint64_t delay, const char* filename = VL_UNKNOWN, int lineno = 0) {
+    auto delay(uint64_t delay, VlProcessRef process, const char* filename = VL_UNKNOWN,
+               int lineno = 0) {
        struct Awaitable {
+            VlProcessRef process;  // Data of the suspended process, null if not needed
            VlDelayedCoroutineQueue& queue;
            uint64_t delay;
            VlFileLineDebug fileline;

            bool await_ready() const { return false; }  // Always suspend
            void await_suspend(std::coroutine_handle<> coro) {
-                queue.push_back({delay, VlCoroutineHandle{coro, fileline}});
+                queue.push_back({delay, VlCoroutineHandle{coro, process, fileline}});
                // Move last element to the proper place in the max-heap
                std::push_heap(queue.begin(), queue.end());
            }
            void await_resume() const {}
        };
-        return Awaitable{m_queue, m_context.time() + delay, VlFileLineDebug{filename, lineno}};
+        return Awaitable{process, m_queue, m_context.time() + delay,
+                         VlFileLineDebug{filename, lineno}};
    }
 };

@@ -207,6 +223,10 @@ class VlTriggerScheduler final {
                                   // (not resumable)
    VlCoroutineVec m_ready;  // Coroutines that can be resumed (all coros from m_uncommitted are
                             // moved here in commit())
+    VlCoroutineVec m_resumeQueue;  // Coroutines being resumed by resume(); kept as a field to
+                                   // avoid reallocation. Resumed coroutines are moved to
+                                   // m_resumeQueue to allow adding coroutines to m_ready
+                                   // during resume(). Outside of resume() should always be empty.

 public:
    // METHODS
@@ -220,21 +240,23 @@ public:
    void dump(const char* eventDescription) const;
 #endif
    // Used by coroutines for co_awaiting a certain trigger
-    auto trigger(const char* eventDescription = VL_UNKNOWN, const char* filename = VL_UNKNOWN,
-                 int lineno = 0) {
+    auto trigger(bool commit, VlProcessRef process, const char* eventDescription = VL_UNKNOWN,
+                 const char* filename = VL_UNKNOWN, int lineno = 0) {
        VL_DEBUG_IF(VL_DBG_MSGF("         Suspending process waiting for %s at %s:%d\n",
                                eventDescription, filename, lineno););
        struct Awaitable {
            VlCoroutineVec& suspended;  // Coros waiting on trigger
+            VlProcessRef process;  // Data of the suspended process, null if not needed
            VlFileLineDebug fileline;

            bool await_ready() const { return false; }  // Always suspend
            void await_suspend(std::coroutine_handle<> coro) {
-                suspended.emplace_back(coro, fileline);
+                suspended.emplace_back(coro, process, fileline);
            }
            void await_resume() const {}
        };
-        return Awaitable{m_uncommitted, VlFileLineDebug{filename, lineno}};
+        return Awaitable{commit ? m_ready : m_uncommitted, process,
+                         VlFileLineDebug{filename, lineno}};
    }
 };

@@ -267,18 +289,19 @@ class VlDynamicTriggerScheduler final {
                            // with destructive post updates, e.g. named events)

    // METHODS
-    auto awaitable(VlCoroutineVec& queue, const char* filename, int lineno) {
+    auto awaitable(VlProcessRef process, VlCoroutineVec& queue, const char* filename, int lineno) {
        struct Awaitable {
+            VlProcessRef process;  // Data of the suspended process, null if not needed
            VlCoroutineVec& suspended;  // Coros waiting on trigger
            VlFileLineDebug fileline;

            bool await_ready() const { return false; }  // Always suspend
            void await_suspend(std::coroutine_handle<> coro) {
-                suspended.emplace_back(coro, fileline);
+                suspended.emplace_back(coro, process, fileline);
            }
            void await_resume() const {}
        };
-        return Awaitable{queue, VlFileLineDebug{filename, lineno}};
+        return Awaitable{process, queue, VlFileLineDebug{filename, lineno}};
    }

 public:
@@ -292,36 +315,29 @@ public:
    void dump() const;
 #endif
    // Used by coroutines for co_awaiting trigger evaluation
-    auto evaluation(const char* eventDescription, const char* filename, int lineno) {
+    auto evaluation(VlProcessRef process, const char* eventDescription, const char* filename,
+                    int lineno) {
        VL_DEBUG_IF(VL_DBG_MSGF("         Suspending process waiting for %s at %s:%d\n",
                                eventDescription, filename, lineno););
-        return awaitable(m_suspended, filename, lineno);
+        return awaitable(process, m_suspended, filename, lineno);
    }
    // Used by coroutines for co_awaiting the trigger post update step
-    auto postUpdate(const char* eventDescription, const char* filename, int lineno) {
+    auto postUpdate(VlProcessRef process, const char* eventDescription, const char* filename,
+                    int lineno) {
        VL_DEBUG_IF(
            VL_DBG_MSGF("         Process waiting for %s at %s:%d awaiting the post update step\n",
                        eventDescription, filename, lineno););
-        return awaitable(m_post, filename, lineno);
+        return awaitable(process, m_post, filename, lineno);
    }
    // Used by coroutines for co_awaiting the resumption step (in 'act' eval)
-    auto resumption(const char* eventDescription, const char* filename, int lineno) {
+    auto resumption(VlProcessRef process, const char* eventDescription, const char* filename,
+                    int lineno) {
        VL_DEBUG_IF(VL_DBG_MSGF("         Process waiting for %s at %s:%d awaiting resumption\n",
                                eventDescription, filename, lineno););
-        return awaitable(m_triggered, filename, lineno);
+        return awaitable(process, m_triggered, filename, lineno);
    }
 };

-//=============================================================================
-// VlNow is a helper awaitable type that always suspends, and then immediately resumes a coroutine.
-// Allows forcing the move of coroutine locals to the heap.
-
-struct VlNow {
-    bool await_ready() const { return false; }  // Always suspend
-    bool await_suspend(std::coroutine_handle<>) const { return false; }  // Resume immediately
-    void await_resume() const {}
-};
-
 //=============================================================================
 // VlForever is a helper awaitable type for suspending coroutines forever. Used for constant
 // wait statements.
@@ -348,24 +364,27 @@ class VlForkSync final {

 public:
    // Create the join object and set the counter to the specified number
-    void init(size_t count) { m_join.reset(new VlJoin{count, {}}); }
+    void init(size_t count, VlProcessRef process) { m_join.reset(new VlJoin{count, {process}}); }
    // Called whenever any of the forked processes finishes. If the join counter reaches 0, the
    // main process gets resumed
    void done(const char* filename = VL_UNKNOWN, int lineno = 0);
    // Used by coroutines for co_awaiting a join
-    auto join(const char* filename = VL_UNKNOWN, int lineno = 0) {
+    auto join(VlProcessRef process, const char* filename = VL_UNKNOWN, int lineno = 0) {
        assert(m_join);
        VL_DEBUG_IF(
            VL_DBG_MSGF("             Awaiting join of fork at: %s:%d\n", filename, lineno););
        struct Awaitable {
+            VlProcessRef process;  // Data of the suspended process, null if not needed
            const std::shared_ptr<VlJoin> join;  // Join to await on
            VlFileLineDebug fileline;

            bool await_ready() { return join->m_counter == 0; }  // Suspend if join still exists
-            void await_suspend(std::coroutine_handle<> coro) { join->m_susp = {coro, fileline}; }
+            void await_suspend(std::coroutine_handle<> coro) {
+                join->m_susp = {coro, process, fileline};
+            }
            void await_resume() const {}
        };
-        return Awaitable{m_join, VlFileLineDebug{filename, lineno}};
+        return Awaitable{process, m_join, VlFileLineDebug{filename, lineno}};
    }
 };

@@ -75,7 +75,7 @@ public:
    // Get an element from the front of the queue. Blocks if none available
    T get() VL_MT_SAFE_EXCLUDES(m_mutex) {
        VerilatedLockGuard lock{m_mutex};
-        m_cv.wait(lock, [this]() VL_REQUIRES(m_mutex) { return !m_queue.empty(); });
+        m_cv.wait(m_mutex, [this]() VL_REQUIRES(m_mutex) { return !m_queue.empty(); });
        assert(!m_queue.empty());
        T value = m_queue.front();
        m_queue.pop_front();
@@ -447,7 +447,9 @@ public:
        if (VL_UNLIKELY(diff)) fullIData(oldp, newval, bits);
    }
    VL_ATTR_ALWINLINE void chgQData(uint32_t* oldp, QData newval, int bits) {
-        const uint64_t diff = *reinterpret_cast<QData*>(oldp) ^ newval;
+        QData old;
+        std::memcpy(&old, oldp, sizeof(old));
+        const uint64_t diff = old ^ newval;
        if (VL_UNLIKELY(diff)) fullQData(oldp, newval, bits);
    }
    VL_ATTR_ALWINLINE void chgWData(uint32_t* oldp, const WData* newvalp, int bits) {
@@ -460,8 +462,9 @@ public:
    }
    VL_ATTR_ALWINLINE void chgEvent(uint32_t* oldp, VlEvent newval) { fullEvent(oldp, newval); }
    VL_ATTR_ALWINLINE void chgDouble(uint32_t* oldp, double newval) {
-        // cppcheck-suppress invalidPointerCast
-        if (VL_UNLIKELY(*reinterpret_cast<double*>(oldp) != newval)) fullDouble(oldp, newval);
+        double old;
+        std::memcpy(&old, oldp, sizeof(old));
+        if (VL_UNLIKELY(old != newval)) fullDouble(oldp, newval);
    }
 };

@@ -482,7 +482,7 @@ VL_ATTR_NOINLINE void VerilatedTrace<VL_SUB_T, VL_BUF_T>::ParallelWorkerData::wa
    // We have been spinning for a while, so yield the thread
    VerilatedLockGuard lock{m_mutex};
    m_waiting = true;
-    m_cv.wait(lock, [this] { return m_ready.load(std::memory_order_relaxed); });
+    m_cv.wait(m_mutex, [this] { return m_ready.load(std::memory_order_relaxed); });
    m_waiting = false;
 }

@@ -872,7 +872,7 @@ void VerilatedTraceBuffer<VL_BUF_T>::fullIData(uint32_t* oldp, IData newval, int
 template <>
 void VerilatedTraceBuffer<VL_BUF_T>::fullQData(uint32_t* oldp, QData newval, int bits) {
    const uint32_t code = oldp - m_sigs_oldvalp;
-    *reinterpret_cast<QData*>(oldp) = newval;
+    std::memcpy(oldp, &newval, sizeof(newval));
    if (VL_UNLIKELY(m_sigs_enabledp && !(VL_BITISSET_W(m_sigs_enabledp, code)))) return;
    emitQData(code, newval, bits);
 }
@@ -888,7 +888,7 @@ void VerilatedTraceBuffer<VL_BUF_T>::fullWData(uint32_t* oldp, const WData* newv
 template <>
 void VerilatedTraceBuffer<VL_BUF_T>::fullDouble(uint32_t* oldp, double newval) {
    const uint32_t code = oldp - m_sigs_oldvalp;
-    *reinterpret_cast<double*>(oldp) = newval;
+    std::memcpy(oldp, &newval, sizeof(newval));
    if (VL_UNLIKELY(m_sigs_enabledp && !(VL_BITISSET_W(m_sigs_enabledp, code)))) return;
    // cppcheck-suppress invalidPointerCast
    emitDouble(code, newval);
@@ -45,6 +45,7 @@ extern std::string VL_TO_STRING(CData lhs);
 extern std::string VL_TO_STRING(SData lhs);
 extern std::string VL_TO_STRING(IData lhs);
 extern std::string VL_TO_STRING(QData lhs);
+extern std::string VL_TO_STRING(double lhs);
 inline std::string VL_TO_STRING(const std::string& obj) { return "\"" + obj + "\""; }
 extern std::string VL_TO_STRING_W(int words, const WDataInP obj);

@@ -72,15 +73,45 @@ extern std::string VL_TO_STRING_W(int words, const WDataInP obj);
 #define VL_OUT(name, msb, lsb) IData name  ///< Declare output signal, 17-32 bits
 #define VL_OUTW(name, msb, lsb, words) VlWide<words> name  ///< Declare output signal, 65+ bits

+//===================================================================
+// VlProcess stores metadata of running processes
+
+class VlProcess final {
+    // MEMBERS
+    int m_state;  // Current state of the process
+
+public:
+    // TYPES
+    enum : int {  // Type int for compatibility with $c
+        FINISHED = 0,
+        RUNNING = 1,
+        WAITING = 2,
+        SUSPENDED = 3,
+        KILLED = 4,
+    };
+
+    // CONSTRUCTORS
+    VlProcess()
+        : m_state{RUNNING} {}
+
+    // METHODS
+    int state() { return m_state; }
+    void state(int s) { m_state = s; }
+};
+
+using VlProcessRef = std::shared_ptr<VlProcess>;
+
+inline std::string VL_TO_STRING(const VlProcessRef& p) { return std::string("process"); }
+
 //===================================================================
 // Activity trigger vector

 template <std::size_t T_size>  //
 class VlTriggerVec final {
    // TODO: static assert T_size > 0, and don't generate when empty
-private:
+
    // MEMBERS
-    std::array<bool, T_size> m_flags;  // State of the assoc array
+    alignas(16) std::array<uint64_t, roundUpToMultipleOf<64>(T_size) / 64> m_flags;  // The flags

 public:
    // CONSTRUCTOR
@@ -90,10 +121,18 @@ public:
    // METHODS

    // Set all elements to false
-    void clear() { m_flags.fill(false); }
+    void clear() { m_flags.fill(0); }

-    // Reference to element at 'index'
-    bool& at(size_t index) { return m_flags.at(index); }
+    // Word at given 'wordIndex'
+    uint64_t word(size_t wordIndex) const { return m_flags[wordIndex]; }
+
+    // Set specified flag to given value
+    void set(size_t index, bool value) {
+        uint64_t& w = m_flags[index / 64];
+        const size_t bitIndex = index % 64;
+        w &= ~(1ULL << bitIndex);
+        w |= (static_cast<uint64_t>(value) << bitIndex);
+    }

    // Return true iff at least one element is set
    bool any() const {
@@ -103,13 +142,13 @@ public:
    }

    // Set all elements true in 'this' that are set in 'other'
-    void set(const VlTriggerVec<T_size>& other) {
+    void thisOr(const VlTriggerVec<T_size>& other) {
        for (size_t i = 0; i < m_flags.size(); ++i) m_flags[i] |= other.m_flags[i];
    }

    // Set elements of 'this' to 'a & !b' element-wise
    void andNot(const VlTriggerVec<T_size>& a, const VlTriggerVec<T_size>& b) {
-        for (size_t i = 0; i < m_flags.size(); ++i) m_flags[i] = a.m_flags[i] && !b.m_flags[i];
+        for (size_t i = 0; i < m_flags.size(); ++i) m_flags[i] = a.m_flags[i] & ~b.m_flags[i];
    }
 };

@@ -135,14 +174,34 @@ public:
 };

 inline std::string VL_TO_STRING(const VlEvent& e) {
-    return std::string("triggered=") + (e.isTriggered() ? "true" : "false");
+    return std::string{"triggered="} + (e.isTriggered() ? "true" : "false");
 }

 //===================================================================
-// Shuffle RNG
+// Random

-extern uint64_t vl_rand64() VL_MT_SAFE;
+// Random Number Generator with internal state
+class VlRNG final {
+    std::array<uint64_t, 2> m_state;

+public:
+    // The default constructor simply sets state, to avoid vl_rand64()
+    // having to check for construction at each call
+    // Alternative: seed with zero and check on rand64() call
+    VlRNG() VL_MT_SAFE;
+    explicit VlRNG(uint64_t seed0) VL_MT_SAFE : m_state{0x12341234UL, seed0} {}
+    void srandom(uint64_t n) VL_MT_UNSAFE;
+    std::string get_randstate() const VL_MT_UNSAFE;
+    void set_randstate(const std::string& state) VL_MT_UNSAFE;
+    uint64_t rand64() VL_MT_UNSAFE;
+    // Threadsafe, but requires use on vl_thread_rng
+    static uint64_t vl_thread_rng_rand64() VL_MT_SAFE;
+    static VlRNG& vl_thread_rng() VL_MT_SAFE;
+};
+
+inline uint64_t vl_rand64() VL_MT_SAFE { return VlRNG::vl_thread_rng_rand64(); }
+
+// RNG for shuffle()
 class VlURNG final {
 public:
    using result_type = size_t;
@@ -151,6 +210,11 @@ public:
    size_t operator()() { return VL_MASK_I(31) & vl_rand64(); }
 };

+// These require the class object to have the thread safety lock
+inline IData VL_RANDOM_RNG_I(VlRNG& rngr) VL_MT_UNSAFE { return rngr.rand64(); }
+inline QData VL_RANDOM_RNG_Q(VlRNG& rngr) VL_MT_UNSAFE { return rngr.rand64(); }
+extern WDataOutP VL_RANDOM_RNG_W(VlRNG& rngr, int obits, WDataOutP outwp) VL_MT_UNSAFE;
+
 //===================================================================
 // Readmem/Writemem operation classes

@@ -369,18 +433,17 @@ public:
    // Can't just overload operator[] or provide a "at" reference to set,
    // because we need to be able to insert only when the value is set
    T_Value& at(int32_t index) {
-        static thread_local T_Value s_throwAway;
+        static thread_local T_Value t_throwAway;
        // Needs to work for dynamic arrays, so does not use T_MaxSize
        if (VL_UNLIKELY(index < 0 || index >= m_deque.size())) {
-            s_throwAway = atDefault();
-            return s_throwAway;
+            t_throwAway = atDefault();
+            return t_throwAway;
        } else {
            return m_deque[index];
        }
    }
    // Accessing. Verilog: v = assoc[index]
    const T_Value& at(int32_t index) const {
-        static thread_local T_Value s_throwAway;
        // Needs to work for dynamic arrays, so does not use T_MaxSize
        if (VL_UNLIKELY(index < 0 || index >= m_deque.size())) {
            return atDefault();
@@ -388,6 +451,10 @@ public:
            return m_deque[index];
        }
    }
+    // Access with an index counted from end (e.g. q[$])
+    T_Value& atBack(int32_t index) { return at(m_deque.size() - 1 - index); }
+    const T_Value& atBack(int32_t index) const { return at(m_deque.size() - 1 - index); }
+
    // function void q.insert(index, value);
    void insert(int32_t index, const T_Value& value) {
        if (VL_UNLIKELY(index < 0 || index >= m_deque.size())) return;
@@ -403,6 +470,12 @@ public:
        for (int32_t i = lsb; i <= msb; ++i) out.push_back(m_deque[i]);
        return out;
    }
+    VlQueue sliceFrontBack(int32_t lsb, int32_t msb) const {
+        return slice(lsb, m_deque.size() - 1 - msb);
+    }
+    VlQueue sliceBackBack(int32_t lsb, int32_t msb) const {
+        return slice(m_deque.size() - 1 - lsb, m_deque.size() - 1 - msb);
+    }

    // For save/restore
    const_iterator begin() const { return m_deque.begin(); }
@@ -444,7 +517,7 @@ public:
    template <typename Func>
    VlQueue unique(Func with_func) const {
        VlQueue out;
-        std::set<T_Value> saw;
+        std::set<decltype(with_func(0, m_deque[0]))> saw;
        for (const auto& i : m_deque) {
            const auto i_mapped = with_func(0, i);
            const auto it = saw.find(i_mapped);
@@ -473,7 +546,7 @@ public:
    VlQueue<IData> unique_index(Func with_func) const {
        VlQueue<IData> out;
        IData index = 0;
-        std::unordered_set<T_Value> saw;
+        std::set<decltype(with_func(0, m_deque[0]))> saw;
        for (const auto& i : m_deque) {
            const auto i_mapped = with_func(index, i);
            auto it = saw.find(i_mapped);
@@ -787,6 +860,22 @@ public:
        }
        return out;
    }
+    template <typename Func>
+    VlQueue<T_Value> unique(Func with_func) const {
+        VlQueue<T_Value> out;
+        T_Key default_key;
+        using WithType = decltype(with_func(m_map.begin()->first, m_map.begin()->second));
+        std::set<WithType> saw;
+        for (const auto& i : m_map) {
+            const auto i_mapped = with_func(default_key, i.second);
+            const auto it = saw.find(i_mapped);
+            if (it == saw.end()) {
+                saw.insert(it, i_mapped);
+                out.push_back(i.second);
+            }
+        }
+        return out;
+    }
    VlQueue<T_Key> unique_index() const {
        VlQueue<T_Key> out;
        std::set<T_Key> saw;
@@ -800,6 +889,21 @@ public:
        return out;
    }
    template <typename Func>
+    VlQueue<T_Key> unique_index(Func with_func) const {
+        VlQueue<T_Key> out;
+        using WithType = decltype(with_func(m_map.begin()->first, m_map.begin()->second));
+        std::set<WithType> saw;
+        for (const auto& i : m_map) {
+            const auto i_mapped = with_func(i.first, i.second);
+            auto it = saw.find(i_mapped);
+            if (it == saw.end()) {
+                saw.insert(it, i_mapped);
+                out.push_back(i.first);
+            }
+        }
+        return out;
+    }
+    template <typename Func>
    VlQueue<T_Value> find(Func with_func) const {
        VlQueue<T_Value> out;
        for (const auto& i : m_map)
@@ -860,6 +964,16 @@ public:
            });
        return VlQueue<T_Value>::cons(it->second);
    }
+    template <typename Func>
+    VlQueue<T_Value> min(Func with_func) const {
+        if (m_map.empty()) return VlQueue<T_Value>();
+        const auto it = std::min_element(
+            m_map.begin(), m_map.end(),
+            [&with_func](const std::pair<T_Key, T_Value>& a, const std::pair<T_Key, T_Value>& b) {
+                return with_func(a.first, a.second) < with_func(b.first, b.second);
+            });
+        return VlQueue<T_Value>::cons(it->second);
+    }
    VlQueue<T_Value> max() const {
        if (m_map.empty()) return VlQueue<T_Value>();
        const auto it = std::max_element(
@@ -869,6 +983,16 @@ public:
            });
        return VlQueue<T_Value>::cons(it->second);
    }
+    template <typename Func>
+    VlQueue<T_Value> max(Func with_func) const {
+        if (m_map.empty()) return VlQueue<T_Value>();
+        const auto it = std::max_element(
+            m_map.begin(), m_map.end(),
+            [&with_func](const std::pair<T_Key, T_Value>& a, const std::pair<T_Key, T_Value>& b) {
+                return with_func(a.first, a.second) < with_func(b.first, b.second);
+            });
+        return VlQueue<T_Value>::cons(it->second);
+    }

    T_Value r_sum() const {
        T_Value out(0);  // Type must have assignment operator
@@ -997,9 +1121,15 @@ void VL_WRITEMEM_N(bool hex, int bits, const std::string& filename,

 template <class T_Value, std::size_t T_Depth>
 struct VlUnpacked final {
+private:
+    // TYPES
+    using T_Key = IData;  // Index type, for uniformity with other containers
+    using Unpacked = T_Value[T_Depth];
+
+public:
    // MEMBERS
    // This should be the only data member, otherwise generated static initializers need updating
-    T_Value m_storage[T_Depth];  // Contents of the unpacked array
+    Unpacked m_storage;  // Contents of the unpacked array

    // CONSTRUCTORS
    // Default constructors and destructor are used. Note however that C++20 requires that
@@ -1010,6 +1140,7 @@ struct VlUnpacked final {
    // Default copy assignment operators are used.

    // METHODS
+public:
    // Raw access
    WData* data() { return &m_storage[0]; }
    const WData* data() const { return &m_storage[0]; }
@@ -1022,6 +1153,170 @@ struct VlUnpacked final {
    bool neq(const VlUnpacked<T_Value, T_Depth>& that) const { return neq(*this, that); }
    // Similar to 'neq' above, *this = that used for change detection
    void assign(const VlUnpacked<T_Value, T_Depth>& that) { *this = that; }
+    bool operator==(const VlUnpacked<T_Value, T_Depth>& that) const { return !neq(that); }
+    bool operator!=(const VlUnpacked<T_Value, T_Depth>& that) { return neq(that); }
+
+    void sort() { std::sort(std::begin(m_storage), std::end(m_storage)); }
+    template <typename Func>
+    void sort(Func with_func) {
+        // with_func returns arbitrary type to use for the sort comparison
+        std::sort(std::begin(m_storage), std::end(m_storage),
+                  [=](const T_Value& a, const T_Value& b) {
+                      // index number is meaningless with sort, as it changes
+                      return with_func(0, a) < with_func(0, b);
+                  });
+    }
+    // std::rbegin/std::rend not available until C++14
+    void rsort() {
+        std::sort(std::begin(m_storage), std::end(m_storage), std::greater<T_Value>());
+    }
+    template <typename Func>
+    void rsort(Func with_func) {
+        // with_func returns arbitrary type to use for the sort comparison
+        // std::rbegin/std::rend not available until C++14, so using > below
+        std::sort(std::begin(m_storage), std::end(m_storage),
+                  [=](const T_Value& a, const T_Value& b) {
+                      // index number is meaningless with sort, as it changes
+                      return with_func(0, a) > with_func(0, b);
+                  });
+    }
+    void reverse() { std::reverse(std::begin(m_storage), std::end(m_storage)); }
+    void shuffle() { std::shuffle(std::begin(m_storage), std::end(m_storage), VlURNG{}); }
+    VlQueue<T_Value> unique() const {
+        VlQueue<T_Value> out;
+        std::set<T_Value> saw;
+        for (const auto& i : m_storage) {
+            const auto it = saw.find(i);
+            if (it == saw.end()) {
+                saw.insert(it, i);
+                out.push_back(i);
+            }
+        }
+        return out;
+    }
+    template <typename Func>
+    VlQueue<T_Value> unique(Func with_func) const {
+        VlQueue<T_Value> out;
+        std::set<T_Value> saw;
+        for (const auto& i : m_storage) {
+            const auto i_mapped = with_func(0, i);
+            const auto it = saw.find(i_mapped);
+            if (it == saw.end()) {
+                saw.insert(it, i_mapped);
+                out.push_back(i);
+            }
+        }
+        return out;
+    }
+    VlQueue<T_Key> unique_index() const {
+        VlQueue<T_Key> out;
+        IData index = 0;
+        std::set<T_Value> saw;
+        for (const auto& i : m_storage) {
+            const auto it = saw.find(i);
+            if (it == saw.end()) {
+                saw.insert(it, i);
+                out.push_back(index);
+            }
+            ++index;
+        }
+        return out;
+    }
+    template <typename Func>
+    VlQueue<T_Key> unique_index(Func with_func) const {
+        VlQueue<T_Key> out;
+        IData index = 0;
+        std::unordered_set<T_Value> saw;
+        for (const auto& i : m_storage) {
+            const auto i_mapped = with_func(index, i);
+            auto it = saw.find(i_mapped);
+            if (it == saw.end()) {
+                saw.insert(it, i_mapped);
+                out.push_back(index);
+            }
+            ++index;
+        }
+        return out;
+    }
+    template <typename Func>
+    VlQueue<T_Value> find(Func with_func) const {
+        VlQueue<T_Value> out;
+        IData index = 0;
+        for (const auto& i : m_storage) {
+            if (with_func(index, i)) out.push_back(i);
+            ++index;
+        }
+        return out;
+    }
+    template <typename Func>
+    VlQueue<T_Key> find_index(Func with_func) const {
+        VlQueue<T_Key> out;
+        IData index = 0;
+        for (const auto& i : m_storage) {
+            if (with_func(index, i)) out.push_back(index);
+            ++index;
+        }
+        return out;
+    }
+    template <typename Func>
+    VlQueue<T_Value> find_first(Func with_func) const {
+        // Can't use std::find_if as need index number
+        IData index = 0;
+        for (const auto& i : m_storage) {
+            if (with_func(index, i)) return VlQueue<T_Value>::cons(i);
+            ++index;
+        }
+        return VlQueue<T_Value>{};
+    }
+    template <typename Func>
+    VlQueue<T_Key> find_first_index(Func with_func) const {
+        IData index = 0;
+        for (const auto& i : m_storage) {
+            if (with_func(index, i)) return VlQueue<IData>::cons(index);
+            ++index;
+        }
+        return VlQueue<T_Key>{};
+    }
+    template <typename Func>
+    VlQueue<T_Value> find_last(Func with_func) const {
+        for (int i = T_Depth - 1; i >= 0; i--) {
+            if (with_func(i, m_storage[i])) return VlQueue<T_Value>::cons(m_storage[i]);
+        }
+        return VlQueue<T_Value>{};
+    }
+    template <typename Func>
+    VlQueue<T_Key> find_last_index(Func with_func) const {
+        for (int i = T_Depth - 1; i >= 0; i--) {
+            if (with_func(i, m_storage[i])) return VlQueue<IData>::cons(i);
+        }
+        return VlQueue<T_Key>{};
+    }
+
+    // Reduction operators
+    VlQueue<T_Value> min() const {
+        const auto it = std::min_element(std::begin(m_storage), std::end(m_storage));
+        return VlQueue<T_Value>::cons(*it);
+    }
+    template <typename Func>
+    VlQueue<T_Value> min(Func with_func) const {
+        const auto it = std::min_element(std::begin(m_storage), std::end(m_storage),
+                                         [&with_func](const IData& a, const IData& b) {
+                                             return with_func(0, a) < with_func(0, b);
+                                         });
+        return VlQueue<T_Value>::cons(*it);
+    }
+    VlQueue<T_Value> max() const {
+        const auto it = std::max_element(std::begin(m_storage), std::end(m_storage));
+        return VlQueue<T_Value>::cons(*it);
+    }
+    template <typename Func>
+    VlQueue<T_Value> max(Func with_func) const {
+        const auto it = std::max_element(std::begin(m_storage), std::end(m_storage),
+                                         [&with_func](const IData& a, const IData& b) {
+                                             return with_func(0, a) < with_func(0, b);
+                                         });
+        return VlQueue<T_Value>::cons(*it);
+    }

    // Dumping. Verilog: str = $sformatf("%p", assoc)
    std::string to_string() const {
@@ -1095,7 +1390,7 @@ public:
    }

    // Deletes all queued garbage objects.
-    void deleteAll() VL_MT_SAFE;
+    void deleteAll() VL_EXCLUDES(m_mutex) VL_EXCLUDES(m_deleteMutex) VL_MT_SAFE;
 };

 //===================================================================
@@ -1165,10 +1460,13 @@ public:
    // CONSTRUCTORS
    VlClassRef() = default;
    // Init with nullptr
-    explicit VlClassRef(VlNull){};
+    // cppcheck-suppress noExplicitConstructor
+    VlClassRef(VlNull){};
    template <typename... T_Args>
    VlClassRef(VlDeleter& deleter, T_Args&&... args)
-        : m_objp{new T_Class{std::forward<T_Args>(args)...}} {
+        // () required here to avoid narrowing conversion warnings,
+        // when a new() has an e.g. CData type and passed a 1U.
+        : m_objp{new T_Class(std::forward<T_Args>(args)...)} {
        m_objp->m_deleterp = &deleter;
        refCountInc();
    }
@@ -1185,6 +1483,16 @@ public:
    // cppcheck-suppress noExplicitConstructor
    VlClassRef(VlClassRef&& moved)
        : m_objp{vlstd::exchange(moved.m_objp, nullptr)} {}
+    // cppcheck-suppress noExplicitConstructor
+    template <typename T_OtherClass>
+    VlClassRef(const VlClassRef<T_OtherClass>& copied)
+        : m_objp{copied.m_objp} {
+        refCountInc();
+    }
+    // cppcheck-suppress noExplicitConstructor
+    template <typename T_OtherClass>
+    VlClassRef(VlClassRef<T_OtherClass>&& moved)
+        : m_objp{vlstd::exchange(moved.m_objp, nullptr)} {}
    ~VlClassRef() { refCountDec(); }

    // METHODS
@@ -1230,8 +1538,14 @@ public:
    // For 'if (ptr)...'
    operator bool() const { return m_objp; }
    // In SV A == B iff both are handles to the same object (IEEE 1800-2017 8.4)
-    bool operator==(const VlClassRef& rhs) const { return m_objp == rhs.m_objp; };
-    bool operator!=(const VlClassRef& rhs) const { return m_objp != rhs.m_objp; };
+    template <typename T_OtherClass>
+    bool operator==(const VlClassRef<T_OtherClass>& rhs) const {
+        return m_objp == rhs.m_objp;
+    };
+    template <typename T_OtherClass>
+    bool operator!=(const VlClassRef<T_OtherClass>& rhs) const {
+        return m_objp != rhs.m_objp;
+    };
 };

 template <typename T, typename U>
@@ -61,16 +61,6 @@ constexpr unsigned VL_TRACE_MAX_VCD_CODE_SIZE = 5;  // Maximum length of a VCD s
 // cache-lines.
 constexpr unsigned VL_TRACE_SUFFIX_ENTRY_SIZE = 8;  // Size of a suffix entry

-//=============================================================================
-// Utility functions: TODO: put these in a common place and share them.
-
-template <size_t N>
-static size_t roundUpToMultipleOf(size_t value) {
-    static_assert((N & (N - 1)) == 0, "'N' must be a power of 2");
-    size_t mask = N - 1;
-    return (value + mask) & ~mask;
-}
-
 //=============================================================================
 // Specialization of the generics for this trace format

@@ -420,28 +410,14 @@ void VerilatedVcd::dumpHeader() {
            if (*np == ' ') np++;
            if (*np == '\t') break;  // tab means signal name starts
            printIndent(1);
-            // Find character after name end
-            const char* sp = np;
-            while (*sp && *sp != ' ' && *sp != '\t' && !(*sp & '\x80')) sp++;
-
-            printStr("$scope ");
-            if (*sp & '\x80') {
-                switch (*sp & 0x7f) {
-                case VLT_TRACE_SCOPE_STRUCT: printStr("struct "); break;
-                case VLT_TRACE_SCOPE_INTERFACE: printStr("interface "); break;
-                case VLT_TRACE_SCOPE_UNION: printStr("union "); break;
-                default: printStr("module ");
-                }
-            } else {
-                printStr("module ");
-            }
+            printStr("$scope module ");

            for (; *np && *np != ' ' && *np != '\t'; np++) {
                if (*np == '[') {
                    printStr("[");
                } else if (*np == ']') {
                    printStr("]");
-                } else if (!(*np & '\x80')) {
+                } else {
                    *m_writep++ = *np;
                }
            }
@@ -36,23 +36,23 @@
 /// with the SystemC simulation kernel, just like a SystemC-documented
 /// trace format.

-class VerilatedVcdSc final : sc_trace_file, public VerilatedVcdC {
+class VerilatedVcdSc final : sc_core::sc_trace_file, public VerilatedVcdC {
    // CONSTRUCTORS
    VL_UNCOPYABLE(VerilatedVcdSc);

 public:
    /// Construct a SC trace object, and register with the SystemC kernel
    VerilatedVcdSc() {
-        sc_get_curr_simcontext()->add_trace_file(this);
+        sc_core::sc_get_curr_simcontext()->add_trace_file(this);
        // 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.
-        const sc_time t1sec{1, SC_SEC};
+        const sc_core::sc_time t1sec{1, sc_core::SC_SEC};
        if (t1sec.to_default_time_units() != 0) {
-            const sc_time tunits{1.0 / t1sec.to_default_time_units(), SC_SEC};
+            const sc_core::sc_time tunits{1.0 / t1sec.to_default_time_units(), sc_core::SC_SEC};
            spTrace()->set_time_unit(tunits.to_string());
        }
-        spTrace()->set_time_resolution(sc_get_time_resolution().to_string());
+        spTrace()->set_time_resolution(sc_core::sc_get_time_resolution().to_string());
    }
    /// Destruct, flush, and close the dump
    ~VerilatedVcdSc() override { close(); }
@@ -60,7 +60,7 @@ public:
    // METHODS - for SC kernel
    // Called by SystemC simulate()
    void cycle(bool delta_cycle) override {
-        if (!delta_cycle) this->dump(sc_time_stamp().to_double());
+        if (!delta_cycle) this->dump(sc_core::sc_time_stamp().to_double());
    }

    // Override VerilatedVcdC. Must be called after starting simulation.
@@ -78,7 +78,7 @@ private:
    // Cadence Incisive has these as abstract functions so we must create them
    void set_time_unit(int exponent10_seconds) override {}  // deprecated
 #endif
-    void set_time_unit(double v, sc_time_unit tu) override {}  // LCOV_EXCL_LINE
+    void set_time_unit(double v, sc_core::sc_time_unit tu) override {}  // LCOV_EXCL_LINE

    //--------------------------------------------------
    // SystemC 2.1.v1
@@ -95,8 +95,8 @@ private:
    // Formatting matches that of sc_trace.h
    // LCOV_EXCL_START
 #if (SYSTEMC_VERSION >= 20171012)
-    DECL_TRACE_METHOD_A( sc_event )
-    DECL_TRACE_METHOD_A( sc_time )
+    DECL_TRACE_METHOD_A( sc_core::sc_event )
+    DECL_TRACE_METHOD_A( sc_core::sc_time )
 #endif

    DECL_TRACE_METHOD_A( bool )
@@ -165,6 +165,7 @@ class VerilatedVpioVarBase VL_NOT_FINAL : public VerilatedVpio {
 protected:
    const VerilatedVar* m_varp = nullptr;
    const VerilatedScope* m_scopep = nullptr;
+    std::string m_fullname;
    const VerilatedRange& get_range() const {
        // Determine number of dimensions and return outermost
        return (m_varp->dims() > 1) ? m_varp->unpacked() : m_varp->packed();
@@ -173,11 +174,13 @@ protected:
 public:
    VerilatedVpioVarBase(const VerilatedVar* varp, const VerilatedScope* scopep)
        : m_varp{varp}
-        , m_scopep{scopep} {}
+        , m_scopep{scopep}
+        , m_fullname{std::string{m_scopep->name()} + '.' + name()} {}
    explicit VerilatedVpioVarBase(const VerilatedVpioVarBase* varp) {
        if (varp) {
            m_varp = varp->m_varp;
            m_scopep = varp->m_scopep;
+            m_fullname = varp->m_fullname;
        }
    }
    static VerilatedVpioVarBase* castp(vpiHandle h) {
@@ -188,11 +191,7 @@ public:
    uint32_t size() const override { return get_range().elements(); }
    const VerilatedRange* rangep() const override { return &get_range(); }
    const char* name() const override { return m_varp->name(); }
-    const char* fullname() const override {
-        static thread_local std::string t_out;
-        t_out = std::string{m_scopep->name()} + "." + name();
-        return t_out.c_str();
-    }
+    const char* fullname() const override { return m_fullname.c_str(); }
 };

 class VerilatedVpioParam final : public VerilatedVpioVarBase {
@@ -646,23 +645,21 @@ public:
                continue;
            }
            VerilatedVpiCbHolder& ho = *it++;
-            if (VerilatedVpioVar* const varop = VerilatedVpioVar::castp(ho.cb_datap()->obj)) {
-                void* const newDatap = varop->varDatap();
-                void* const prevDatap
-                    = varop->prevDatap();  // Was malloced when we added the callback
-                VL_DEBUG_IF_PLI(VL_DBG_MSGF("- vpi: value_test %s v[0]=%d/%d %p %p\n",
-                                            varop->fullname(), *(static_cast<CData*>(newDatap)),
-                                            *(static_cast<CData*>(prevDatap)), newDatap,
-                                            prevDatap););
-                if (std::memcmp(prevDatap, newDatap, varop->entSize()) != 0) {
-                    VL_DEBUG_IF_PLI(VL_DBG_MSGF("- vpi: value_callback %" PRId64 " %s v[0]=%d\n",
-                                                ho.id(), varop->fullname(),
-                                                *(static_cast<CData*>(newDatap))););
-                    update.insert(varop);
-                    vpi_get_value(ho.cb_datap()->obj, ho.cb_datap()->value);
-                    (ho.cb_rtnp())(ho.cb_datap());
-                    called = true;
-                }
+            VerilatedVpioVar* const varop
+                = reinterpret_cast<VerilatedVpioVar*>(ho.cb_datap()->obj);
+            void* const newDatap = varop->varDatap();
+            void* const prevDatap = varop->prevDatap();  // Was malloced when we added the callback
+            VL_DEBUG_IF_PLI(VL_DBG_MSGF("- vpi: value_test %s v[0]=%d/%d %p %p\n",
+                                        varop->fullname(), *(static_cast<CData*>(newDatap)),
+                                        *(static_cast<CData*>(prevDatap)), newDatap, prevDatap););
+            if (std::memcmp(prevDatap, newDatap, varop->entSize()) != 0) {
+                VL_DEBUG_IF_PLI(VL_DBG_MSGF("- vpi: value_callback %" PRId64 " %s v[0]=%d\n",
+                                            ho.id(), varop->fullname(),
+                                            *(static_cast<CData*>(newDatap))););
+                update.insert(varop);
+                vpi_get_value(ho.cb_datap()->obj, ho.cb_datap()->value);
+                (ho.cb_rtnp())(ho.cb_datap());
+                called = true;
            }
            if (was_last) break;
        }
@@ -791,7 +788,6 @@ void VerilatedVpiImp::dumpCbs() VL_MT_UNSAFE_ONE {
    }
    for (auto& ifuture : s().m_nextCbs) {
        const QData time = ifuture.first.first;
-        const uint64_t id = ifuture.first.second;
        VerilatedVpiCbHolder& ho = ifuture.second;
        if (VL_UNLIKELY(!ho.invalid())) {
            VL_DBG_MSGF("- vpi:   time=%" PRId64 "(NEXT) reason=%d=%s  id=%" PRId64 "\n", time,
@@ -802,7 +798,6 @@ void VerilatedVpiImp::dumpCbs() VL_MT_UNSAFE_ONE {
    }
    for (auto& ifuture : s().m_futureCbs) {
        const QData time = ifuture.first.first;
-        const uint64_t id = ifuture.first.second;
        VerilatedVpiCbHolder& ho = ifuture.second;
        if (VL_UNLIKELY(!ho.invalid())) {
            VL_DBG_MSGF("- vpi:   time=%" PRId64 " reason=%d=%s  id=%" PRId64 "\n", time,
@@ -2312,7 +2307,7 @@ PLI_INT32 vpi_flush(void) {
    VerilatedVpiImp::assertOneCheck();
    VL_VPI_ERROR_RESET_();
    Verilated::runFlushCallbacks();
-    return 0;
+    return 0;  // Gcc coverage bug // LCOV_EXCL_LINE
 }

 PLI_INT32 vpi_mcd_flush(PLI_UINT32 mcd) {
@@ -37,8 +37,13 @@
 //=========================================================================
 // Compiler pragma abstraction

+#if defined(__clang__)
+# define VL_CLANG_ATTR(attr) __attribute__(( attr ))
+#else
+# define VL_CLANG_ATTR(attr)
+#endif
+
 #ifdef __GNUC__
-# define VL_ATTR_ALIGNED(alignment) __attribute__((aligned(alignment)))
 # define VL_ATTR_ALWINLINE __attribute__((always_inline)) inline
 # define VL_ATTR_NOINLINE __attribute__((noinline))
 # define VL_ATTR_COLD __attribute__((cold))
@@ -57,19 +62,6 @@
 // All VL_ATTR_WEAK symbols must be marked with the macOS -U linker flag in verilated.mk.in
 #  define VL_ATTR_WEAK __attribute__((weak))
 # endif
-# if defined(__clang__)
-#  define VL_ACQUIRE(...) __attribute__((annotate("ACQUIRE"))) __attribute__((acquire_capability(__VA_ARGS__)))
-#  define VL_ACQUIRE_SHARED(...) __attribute__((annotate("ACQUIRE_SHARED"))) __attribute__((acquire_shared_capability(__VA_ARGS__)))
-#  define VL_RELEASE(...) __attribute__((annotate("RELEASE"))) __attribute__((release_capability(__VA_ARGS__)))
-#  define VL_RELEASE_SHARED(...) __attribute__((annotate("RELEASE_SHARED"))) __attribute__((release_shared_capability(__VA_ARGS__)))
-#  define VL_TRY_ACQUIRE(...) __attribute__((try_acquire_capability(__VA_ARGS__)))
-#  define VL_TRY_ACQUIRE_SHARED(...) __attribute__((try_acquire_shared_capability(__VA_ARGS__)))
-#  define VL_CAPABILITY(x) __attribute__((capability(x)))
-#  define VL_REQUIRES(x) __attribute__((annotate("REQUIRES"))) __attribute__((requires_capability(x)))
-#  define VL_GUARDED_BY(x) __attribute__((annotate("GUARDED_BY"))) __attribute__((guarded_by(x)))
-#  define VL_EXCLUDES(x) __attribute__((annotate("EXCLUDES"))) __attribute__((locks_excluded(x)))
-#  define VL_SCOPED_CAPABILITY __attribute__((scoped_lockable))
-# endif
 # define VL_LIKELY(x) __builtin_expect(!!(x), 1)  // Prefer over C++20 [[likely]]
 # define VL_UNLIKELY(x) __builtin_expect(!!(x), 0)  // Prefer over C++20 [[unlikely]]
 # define VL_UNREACHABLE __builtin_unreachable()  // C++23 std::unreachable()
@@ -77,10 +69,62 @@
 # define VL_PREFETCH_RW(p) __builtin_prefetch((p), 1)
 #endif

+// Function acquires a capability/lock (-fthread-safety)
+#define VL_ACQUIRE(...) \
+        VL_CLANG_ATTR(annotate("ACQUIRE")) \
+        VL_CLANG_ATTR(acquire_capability(__VA_ARGS__))
+// Function acquires a shared capability/lock (-fthread-safety)
+#define VL_ACQUIRE_SHARED(...) \
+        VL_CLANG_ATTR(annotate("ACQUIRE_SHARED")) \
+        VL_CLANG_ATTR(acquire_shared_capability(__VA_ARGS__))
+// Function releases a capability/lock (-fthread-safety)
+#define VL_RELEASE(...) \
+        VL_CLANG_ATTR(annotate("RELEASE")) \
+        VL_CLANG_ATTR(release_capability(__VA_ARGS__))
+// Function releases a shared capability/lock (-fthread-safety)
+#define VL_RELEASE_SHARED(...) \
+        VL_CLANG_ATTR(annotate("RELEASE_SHARED")) \
+        VL_CLANG_ATTR(release_shared_capability(__VA_ARGS__))
+// Function returns bool if acquired a capability (-fthread-safety)
+#define VL_TRY_ACQUIRE(...) \
+        VL_CLANG_ATTR(try_acquire_capability(__VA_ARGS__))
+// Function returns bool if acquired shared (-fthread-safety)
+#define VL_TRY_ACQUIRE_SHARED(...) \
+        VL_CLANG_ATTR(try_acquire_shared_capability(__VA_ARGS__))
+// Function requires a capability inbound (-fthread-safety)
+#define VL_CAPABILITY(x) \
+        VL_CLANG_ATTR(capability(x))
+// Function requires not having a capability inbound (-fthread-safety)
+#define VL_REQUIRES(x) \
+        VL_CLANG_ATTR(annotate("REQUIRES")) \
+        VL_CLANG_ATTR(requires_capability(x))
+// Name of capability/lock (-fthread-safety)
+#define VL_GUARDED_BY(x) \
+        VL_CLANG_ATTR(annotate("GUARDED_BY")) \
+        VL_CLANG_ATTR(guarded_by(x))
+// The data that the annotated pointer points to is protected by the given capability.
+// The pointer itself is not protected.
+// Allowed on: pointer data member. (-fthread-safety)
+#define VL_PT_GUARDED_BY(x) \
+        VL_CLANG_ATTR(annotate("PT_GUARDED_BY")) \
+        VL_CLANG_ATTR(pt_guarded_by(x))
+// Name of mutex protecting this variable (-fthread-safety)
+#define VL_EXCLUDES(x) \
+        VL_CLANG_ATTR(annotate("EXCLUDES")) \
+        VL_CLANG_ATTR(locks_excluded(x))
+// Scoped threaded capability/lock (-fthread-safety)
+#define VL_SCOPED_CAPABILITY \
+        VL_CLANG_ATTR(scoped_lockable)
+// Annotated function returns reference to the given capability.
+// Allowed on: function, method. (-fthread-safety)
+#define VL_RETURN_CAPABILITY(x) \
+        VL_CLANG_ATTR(lock_returned(x))
+// Assert that capability is already held.
+// Allowed on: function, method. (-fthread-safety)
+#define VL_ASSERT_CAPABILITY(x) \
+        VL_CLANG_ATTR(assert_capability(x))
+
 // Defaults for unsupported compiler features
-#ifndef VL_ATTR_ALIGNED
-# define VL_ATTR_ALIGNED(alignment)  ///< Attribute to align structure to byte alignment
-#endif
 #ifndef VL_ATTR_ALWINLINE
 # define VL_ATTR_ALWINLINE  ///< Attribute to inline, even when not optimizing
 #endif
@@ -111,19 +155,6 @@
 #ifndef VL_ATTR_WEAK
 # define VL_ATTR_WEAK  ///< Attribute that function external that is optionally defined
 #endif
-#ifndef VL_CAPABILITY
-# define VL_ACQUIRE(...)  ///< Function acquires a capability/lock (-fthread-safety)
-# define VL_ACQUIRE_SHARED(...)  ///< Function acquires a shared capability/lock (-fthread-safety)
-# define VL_RELEASE(...)  ///< Function releases a capability/lock (-fthread-safety)
-# define VL_RELEASE_SHARED(...)  ///< Function releases a shared capability/lock (-fthread-safety)
-# define VL_TRY_ACQUIRE(...)  ///< Function returns bool if acquired a capability (-fthread-safety)
-# define VL_TRY_ACQUIRE_SHARED(...)  ///< Function returns bool if acquired shared (-fthread-safety)
-# define VL_REQUIRES(x)  ///< Function requires a capability inbound (-fthread-safety)
-# define VL_EXCLUDES(x)  ///< Function requires not having a capability inbound (-fthread-safety)
-# define VL_CAPABILITY(x)  ///< Name of capability/lock (-fthread-safety)
-# define VL_GUARDED_BY(x)  ///< Name of mutex protecting this variable (-fthread-safety)
-# define VL_SCOPED_CAPABILITY  ///< Scoped threaded capability/lock (-fthread-safety)
-#endif
 #ifndef VL_LIKELY
 # define VL_LIKELY(x) (!!(x))  ///< Return boolean expression that is more often true
 # define VL_UNLIKELY(x) (!!(x))  ///< Return boolean expression that is more often false
@@ -142,6 +173,7 @@


 #ifndef VL_NO_LEGACY
+# define VL_ATTR_ALIGNED(alignment)  // Deprecated
 # define VL_FUNC __func__  // Deprecated
 # define VL_THREAD  // Deprecated
 # define VL_THREAD_LOCAL thread_local  // Deprecated
@@ -149,49 +181,24 @@
 #endif

 // Comment tag that Function is pure (and thus also VL_MT_SAFE)
-#if defined(__clang__)
-# define VL_PURE __attribute__((annotate("PURE")))
-#else
-# define VL_PURE
-#endif
+#define VL_PURE VL_CLANG_ATTR(annotate("PURE"))
 // Comment tag that function is threadsafe
-#if defined(__clang__)
-# define VL_MT_SAFE __attribute__((annotate("MT_SAFE")))
-#else
-# define VL_MT_SAFE
-#endif
+#define VL_MT_SAFE VL_CLANG_ATTR(annotate("MT_SAFE"))
+// Comment tag that function is threadsafe, only if
+// other threads doesn't change tree topology
+#define VL_MT_STABLE VL_CLANG_ATTR(annotate("MT_STABLE"))
 // Comment tag that function is threadsafe, only
 // during normal operation (post-init)
-#if defined(__clang__)
-# define VL_MT_SAFE_POSTINIT __attribute__((annotate("MT_SAFE_POSTINIT")))
-#else
-# define VL_MT_SAFE_POSTINIT
-#endif
+#define VL_MT_SAFE_POSTINIT VL_CLANG_ATTR(annotate("MT_SAFE_POSTINIT"))
 // Attribute that function is clang threadsafe and uses given mutex
-#if defined(__clang__)
-# define VL_MT_SAFE_EXCLUDES(mutex) __attribute__((annotate("MT_SAFE_EXCLUDES"))) VL_EXCLUDES(mutex)
-#else
-# define VL_MT_SAFE_EXCLUDES(mutex) VL_EXCLUDES(mutex)
-#endif
+#define VL_MT_SAFE_EXCLUDES(mutex) VL_CLANG_ATTR(annotate("MT_SAFE_EXCLUDES")) VL_EXCLUDES(mutex)
 // Comment tag that function is not threadsafe
-#if defined(__clang__)
-# define VL_MT_UNSAFE __attribute__((annotate("MT_UNSAFE")))
-#else
-# define VL_MT_UNSAFE
-#endif
+#define VL_MT_UNSAFE VL_CLANG_ATTR(annotate("MT_UNSAFE"))
 // Comment tag that function is not threadsafe
 // protected to make sure single-caller
-#if defined(__clang__)
-# define VL_MT_UNSAFE_ONE __attribute__((annotate("MT_UNSAFE_ONE")))
-#else
-# define VL_MT_UNSAFE_ONE
-#endif
+#define VL_MT_UNSAFE_ONE VL_CLANG_ATTR(annotate("MT_UNSAFE_ONE"))
 // Comment tag that function is entry point of parallelization
-#if defined(__clang__)
-# define VL_MT_START __attribute__((annotate("MT_START")))
-#else
-# define VL_MT_START
-#endif
+#define VL_MT_START VL_CLANG_ATTR(annotate("MT_START"))

 #ifndef VL_NO_LEGACY
 # define VL_ULL(c) (c##ULL)  // Add appropriate suffix to 64-bit constant (deprecated)
@@ -317,6 +324,7 @@ extern "C" void __gcov_dump();
 // Now that C++ requires these standard types the vl types are deprecated
 #include <cstdint>
 #include <cinttypes>
+#include <cmath>

 #ifndef VL_NO_LEGACY
 using vluint8_t = uint8_t;  ///< 8-bit unsigned type (backward compatibility)
@@ -441,11 +449,14 @@ using ssize_t = uint32_t;  ///< signed size_t; returned from read()
 #define VL_SIZEBITS_E (VL_EDATASIZE - 1)  ///< Bit mask for bits in a quad

 /// Return mask for words with 1's where relevant bits are (0=all bits)
+/// Arguments must not have side effects
 #define VL_MASK_I(nbits) (((nbits) & VL_SIZEBITS_I) ? ((1U << ((nbits) & VL_SIZEBITS_I)) - 1) : ~0)
 /// Return mask for quads with 1's where relevant bits are (0=all bits)
+/// Arguments must not have side effects
 #define VL_MASK_Q(nbits) \
    (((nbits) & VL_SIZEBITS_Q) ? ((1ULL << ((nbits) & VL_SIZEBITS_Q)) - 1ULL) : ~0ULL)
 /// Return mask for EData with 1's where relevant bits are (0=all bits)
+/// Arguments must not have side effects
 #define VL_MASK_E(nbits) VL_MASK_I(nbits)

 #define VL_EUL(n) VL_UL(n)  // Make constant number EData sized
@@ -467,8 +478,12 @@ using ssize_t = uint32_t;  ///< signed size_t; returned from read()
 // #defines, to avoid requiring math.h on all compile runs

 #ifdef _MSC_VER
-# define VL_TRUNC(n) (((n) < 0) ? std::ceil((n)) : std::floor((n)))
-# define VL_ROUND(n) (((n) < 0) ? std::ceil((n)-0.5) : std::floor((n) + 0.5))
+static inline double VL_TRUNC(double n) {
+    return (n < 0) ? std::ceil(n) : std::floor(n);
+}
+static inline double VL_ROUND(double n) {
+    return (n < 0) ? std::ceil(n-0.5) : std::floor(n + 0.5);
+}
 #else
 # define VL_TRUNC(n) std::trunc(n)
 # define VL_ROUND(n) std::round(n)
@@ -519,6 +534,8 @@ using ssize_t = uint32_t;  ///< signed size_t; returned from read()
 # define VL_CPU_RELAX() asm volatile("nop" ::: "memory");
 #elif defined(__aarch64__) || defined(__arm__)
 # define VL_CPU_RELAX() asm volatile("yield" ::: "memory")
+#elif defined(__hppa__)  // HPPA does not currently have yield/pause
+# define VL_CPU_RELAX() asm volatile("nop" ::: "memory")
 #elif defined(__loongarch__)  // LoongArch does not currently have yield/pause
 # define VL_CPU_RELAX() asm volatile("nop" ::: "memory")
 #elif defined(__mips64el__) || defined(__mips__) || defined(__mips64__) || defined(__mips64)
@@ -594,8 +611,12 @@ reverse_wrapper<T> reverse_view(const T& v) {
 }

 // C++17's std::as_const
+// `VL_MT_SAFE` annotation only applies to this function.
+// Object that is returned by this function is not considered
+// as MT_SAFE and any function call on this object still
+// needs to be `VL_MT_SAFE`.
 template <class T>
-T const& as_const(T& v) {
+T const& as_const(T& v) VL_MT_SAFE {
    return v;
 }

@@ -106,7 +106,7 @@ done

 if [ x"$src" = x ]
 then
-	echo "install:	no input file specified"
+	echo "install: no input file specified"
 	exit 1
 else
 	true
@@ -137,7 +137,7 @@ else

 	if [ x"$dst" = x ]
 	then
-		echo "install:	no destination specified"
+		echo "install: no destination specified"
 		exit 1
 	else
 		true
@@ -33,10 +33,31 @@ def fully_qualified_name(node):
    return [node.displayname] if node.displayname else []


+# Returns True, if `class_node` contains node
+# that matches `member` spelling
+def check_class_member_exists(class_node, member):
+    for child in class_node.get_children():
+        if member.spelling == child.spelling:
+            return True
+    return False
+
+
+# Returns Base class (if found) of `class_node`
+# that is of type `base_type`
+def get_base_class(class_node, base_type):
+    for child in class_node.get_children():
+        if child.kind is CursorKind.CXX_BASE_SPECIFIER:
+            base_class = child.type
+            if base_type.spelling == base_class.spelling:
+                return base_class
+    return None
+
+
@dataclass
 class VlAnnotations:
    mt_start: bool = False
    mt_safe: bool = False
+    stable_tree: bool = False
    mt_safe_postinit: bool = False
    mt_unsafe: bool = False
    mt_unsafe_one: bool = False
@@ -48,12 +69,17 @@ class VlAnnotations:
    release: bool = False

    def is_mt_safe_context(self):
-        return (not (self.mt_unsafe or self.mt_unsafe_one)
-                and (self.mt_safe or self.mt_start))
+        return self.mt_safe and not (self.mt_unsafe or self.mt_unsafe_one)

    def is_pure_context(self):
        return self.pure

+    def is_stabe_tree_context(self):
+        # stable tree context requires calls to be marked
+        # as MT_SAFE or MT_STABLE
+        # Functions in MT_START needs to be MT_SAFE or MT_STABLE
+        return self.stable_tree or self.mt_start
+
    def is_mt_unsafe_call(self):
        return self.mt_unsafe or self.mt_unsafe_one

@@ -66,6 +92,9 @@ class VlAnnotations:
    def is_pure_call(self):
        return self.pure

+    def is_stabe_tree_call(self):
+        return self.stable_tree
+
    def __or__(self, other: "VlAnnotations"):
        result = VlAnnotations()
        for key, value in dataclasses.asdict(self).items():
@@ -94,6 +123,8 @@ class VlAnnotations:
                    result.mt_start = True
                elif node.displayname == "MT_SAFE":
                    result.mt_safe = True
+                elif node.displayname == "MT_STABLE":
+                    result.stable_tree = True
                elif node.displayname == "MT_SAFE_POSTINIT":
                    result.mt_safe_postinit = True
                elif node.displayname == "MT_UNSAFE":
@@ -196,6 +227,7 @@ class DiagnosticKind(Enum):
    ANNOTATIONS_DEF_DECL_MISMATCH = enum.auto()
    NON_PURE_CALL_IN_PURE_CTX = enum.auto()
    NON_MT_SAFE_CALL_IN_MT_SAFE_CTX = enum.auto()
+    NON_STABLE_TREE_CALL_IN_STABLE_TREE_CTX = enum.auto()

    def __lt__(self, other):
        return self.value < other.value
@@ -239,6 +271,10 @@ class CallAnnotationsValidator:
        self._call_location: Optional[FunctionInfo] = None
        self._caller: Optional[FunctionInfo] = None
        self._level: int = 0
+        self._constructor_context: list[clang.cindex.Cursor] = []
+
+    def is_constructor_context(self):
+        return len(self._constructor_context) > 0

    def compile_and_analyze_file(self, source_file: str,
                                 compiler_args: list[str],
@@ -300,6 +336,91 @@ class CallAnnotationsValidator:
        annotations = VlAnnotations.from_nodes_list(children)
        return (True, refd, annotations, children)

+    def check_mt_safe_call(self, node: clang.cindex.Cursor,
+                           refd: clang.cindex.Cursor,
+                           annotations: VlAnnotations):
+        is_mt_safe = False
+
+        if annotations.is_mt_safe_call():
+            is_mt_safe = True
+        elif not annotations.is_mt_unsafe_call():
+            # Check whether the object the method is called on is mt-safe
+            def find_object_ref(node):
+                try:
+                    node = next(node.get_children())
+                    if node.kind == CursorKind.DECL_REF_EXPR:
+                        # Operator on an argument or local object
+                        return node
+                    if node.kind != CursorKind.MEMBER_REF_EXPR:
+                        return None
+                    if node.referenced and node.referenced.kind == CursorKind.FIELD_DECL:
+                        # Operator on a member object
+                        return node
+                    node = next(node.get_children())
+                    if node.kind == CursorKind.UNEXPOSED_EXPR:
+                        node = next(node.get_children())
+                    return node
+                except StopIteration:
+                    return None
+
+            refn = find_object_ref(node)
+            if self.is_constructor_context() and not refn:
+                # we are in constructor and no object reference means
+                # we are calling local method. It is MT safe
+                # only if this method is also only calling local methods or
+                # MT-safe methods
+                self.iterate_children(refd.get_children(),
+                                      self.dispatch_node_inside_definition)
+                is_mt_safe = True
+            # class/struct member
+            elif refn and refn.kind == CursorKind.MEMBER_REF_EXPR and refn.referenced:
+                refn = refn.referenced
+                refna = VlAnnotations.from_nodes_list(refn.get_children())
+                if refna.guarded:
+                    is_mt_safe = True
+                if self.is_constructor_context() and refn.semantic_parent:
+                    # we are in constructor, so calling local members is MT_SAFE,
+                    # make sure object that we are calling is local to the constructor
+                    constructor_class = self._constructor_context[
+                        -1].semantic_parent
+                    if refn.semantic_parent.spelling == constructor_class.spelling:
+                        if check_class_member_exists(constructor_class, refn):
+                            is_mt_safe = True
+                    else:
+                        # check if this class inherits from some base class
+                        base_class = get_base_class(constructor_class,
+                                                    refn.semantic_parent)
+                        if base_class:
+                            if check_class_member_exists(
+                                    base_class.get_declaration(), refn):
+                                is_mt_safe = True
+            # variable
+            elif refn and refn.kind == CursorKind.DECL_REF_EXPR and refn.referenced:
+                if refn.get_definition():
+                    if refn.referenced.semantic_parent:
+                        if refn.referenced.semantic_parent.kind in [
+                                CursorKind.FUNCTION_DECL, CursorKind.CXX_METHOD
+                        ]:
+                            # This is a local or an argument.
+                            # Calling methods on local pointers or references is MT-safe,
+                            # but on argument pointers or references is not.
+                            if "*" not in refn.type.spelling and "&" not in refn.type.spelling:
+                                is_mt_safe = True
+                            # local variable
+                            if refn.referenced.kind == CursorKind.VAR_DECL:
+                                is_mt_safe = True
+                else:
+                    # Global variable in different translation unit, unsafe
+                    pass
+            elif refn and refn.kind == CursorKind.CALL_EXPR:
+                if self.is_constructor_context():
+                    # call to local function from constructor context
+                    # safe if this function also calling local methods or
+                    # MT-safe methods
+                    self.dispatch_call_node(refn)
+                    is_mt_safe = True
+        return is_mt_safe
+
    # Call handling

    def process_method_call(self, node: clang.cindex.Cursor,
@@ -310,47 +431,22 @@ class CallAnnotationsValidator:

        # MT-safe context
        if ctx.is_mt_safe_context():
-            is_mt_safe = False
-
-            if annotations.is_mt_safe_call():
-                is_mt_safe = True
-            elif not annotations.is_mt_unsafe_call():
-                # Check whether the object the method is called on is mt-safe
-                def find_object_ref(node):
-                    try:
-                        node = next(node.get_children())
-                        if node.kind == CursorKind.DECL_REF_EXPR:
-                            # Operator on an argument or local object
-                            return node
-                        if node.kind != CursorKind.MEMBER_REF_EXPR:
-                            return None
-                        if node.referenced and node.referenced.kind == CursorKind.FIELD_DECL:
-                            # Operator on a member object
-                            return node
-                        node = next(node.get_children())
-                        if node.kind == CursorKind.UNEXPOSED_EXPR:
-                            node = next(node.get_children())
-                        return node
-                    except StopIteration:
-                        return None
-
-                refn = find_object_ref(node)
-                # class/struct member
-                if refn and refn.kind == CursorKind.MEMBER_REF_EXPR and refn.referenced:
-                    refn = refn.referenced
-                    refna = VlAnnotations.from_nodes_list(refn.get_children())
-                    if refna.guarded:
-                        is_mt_safe = True
-                # variable
-                elif refn and refn.kind == CursorKind.DECL_REF_EXPR and refn.referenced:
-                    # This is probably a local or an argument. Assume it's safe.
-                    is_mt_safe = True
-
-            if not is_mt_safe:
+            if not self.check_mt_safe_call(node, refd, annotations):
                self.emit_diagnostic(
                    FunctionInfo.from_node(refd, refd, annotations),
                    DiagnosticKind.NON_MT_SAFE_CALL_IN_MT_SAFE_CTX)

+        # stable tree context
+        if ctx.is_stabe_tree_context():
+            if annotations.is_mt_unsafe_call() or not (
+                    annotations.is_stabe_tree_call()
+                    or annotations.is_pure_call()
+                    or self.check_mt_safe_call(node, refd, annotations)):
+                self.emit_diagnostic(
+                    FunctionInfo.from_node(refd, refd, annotations),
+                    DiagnosticKind.NON_STABLE_TREE_CALL_IN_STABLE_TREE_CTX)
+
+        # pure context
        if ctx.is_pure_context():
            if not annotations.is_pure_call():
                self.emit_diagnostic(
@@ -368,6 +464,17 @@ class CallAnnotationsValidator:
                self.emit_diagnostic(
                    FunctionInfo.from_node(refd, refd, annotations),
                    DiagnosticKind.NON_MT_SAFE_CALL_IN_MT_SAFE_CTX)
+
+        # stable tree context
+        if ctx.is_stabe_tree_context():
+            if annotations.is_mt_unsafe_call() or not (
+                    annotations.is_pure_call()
+                    or annotations.is_mt_safe_call()
+                    or annotations.is_stabe_tree_call()):
+                self.emit_diagnostic(
+                    FunctionInfo.from_node(refd, refd, annotations),
+                    DiagnosticKind.NON_STABLE_TREE_CALL_IN_STABLE_TREE_CTX)
+
        # pure context
        if ctx.is_pure_context():
            if not annotations.is_pure_call():
@@ -380,7 +487,20 @@ class CallAnnotationsValidator:
        assert self._call_location
        ctx = self._call_location.annotations

-        # Constructors are always OK in MT-safe context.
+        # Constructors are OK in MT-safe context
+        # only if they call local methods or MT-safe functions.
+        if ctx.is_mt_safe_context() or self.is_constructor_context():
+            self._constructor_context.append(refd)
+            self.iterate_children(refd.get_children(),
+                                  self.dispatch_node_inside_definition)
+            self._constructor_context.pop()
+
+        # stable tree context
+        if ctx.is_stabe_tree_context():
+            self._constructor_context.append(refd)
+            self.iterate_children(refd.get_children(),
+                                  self.dispatch_node_inside_definition)
+            self._constructor_context.pop()

        # pure context
        if ctx.is_pure_context():
@@ -396,11 +516,19 @@ class CallAnnotationsValidator:
        if not supported:
            self.iterate_children(node.get_children(),
                                  self.dispatch_node_inside_definition)
-            return
+            return True

        assert refd is not None
        if self._is_ignored_call(refd):
-            return
+            return True
+
+        if "std::function" in refd.displayname:
+            # Workaroud for missing support for lambda annotations
+            # in c++11.
+            # If function takes std::function as argument,
+            # assume, that this std::function will be called inside it.
+            self.process_function_definition(node)
+            return False

        assert self._call_location is not None
        node_file = os.path.abspath(node.location.file.name)
@@ -412,37 +540,40 @@ class CallAnnotationsValidator:
                or refd.kind == CursorKind.CXX_METHOD
                and refd.is_static_method()):
            self.process_function_call(refd, annotations)
-            return
        # Function pointer
-        if refd.kind in [
+        elif refd.kind in [
                CursorKind.VAR_DECL, CursorKind.FIELD_DECL,
                CursorKind.PARM_DECL
        ]:
            self.process_function_call(refd, annotations)
-            return
        # Non-static class methods
-        if refd.kind == CursorKind.CXX_METHOD:
+        elif refd.kind == CursorKind.CXX_METHOD:
            self.process_method_call(node, refd, annotations)
-            return
        # Conversion method (e.g. `operator int()`)
-        if refd.kind == CursorKind.CONVERSION_FUNCTION:
+        elif refd.kind == CursorKind.CONVERSION_FUNCTION:
            self.process_method_call(node, refd, annotations)
-            return
        # Constructors
-        if refd.kind == CursorKind.CONSTRUCTOR:
+        elif refd.kind == CursorKind.CONSTRUCTOR:
            self.process_constructor_call(refd, annotations)
-            return
-
-        # Ignore other callables
-        print(f"{refd.location.file.name}:{refd.location.line}: "
-              f"{refd.displayname}    {refd.kind}\n"
-              f"    from: {node.location.file.name}:{node.location.line}")
+        else:
+            # Ignore other callables, but report them
+            print("Unknown callable: "
+                  f"{refd.location.file.name}:{refd.location.line}: "
+                  f"{refd.displayname}    {refd.kind}\n"
+                  f"    from: {node.location.file.name}:{node.location.line}")
+        return True

    # Definition handling

    def dispatch_node_inside_definition(self, node: clang.cindex.Cursor):
        if node.kind == CursorKind.CALL_EXPR:
-            self.dispatch_call_node(node)
+            if self.dispatch_call_node(node) is False:
+                return None
+        elif node.is_definition() and node.kind in [
+                CursorKind.CXX_METHOD, CursorKind.FUNCTION_DECL,
+                CursorKind.CONSTRUCTOR, CursorKind.CONVERSION_FUNCTION
+        ]:
+            self.process_function_definition(node)
            return None

        return self.iterate_children(node.get_children(),
@@ -461,9 +592,6 @@ class CallAnnotationsValidator:

        assert refd is not None

-        prev_caller = self._caller
-        prev_call_location = self._call_location
-
        def_annotations = VlAnnotations.from_nodes_list(node_children)

        if not (def_annotations.is_empty() or def_annotations == annotations):
@@ -480,13 +608,14 @@ class CallAnnotationsValidator:
        # for callees validation.
        self._caller = FunctionInfo.from_node(node, refd,
                                              def_annotations | annotations)
+        prev_call_location = self._call_location
        self._call_location = self._caller

        self.iterate_children(node_children,
                              self.dispatch_node_inside_definition)

        self._call_location = prev_call_location
-        self._caller = prev_caller
+        self._caller = prev_call_location

        return None

@@ -704,8 +833,7 @@ class TopDownSummaryPrinter():
        info: FunctionInfo
        calees: set[FunctionInfo]
        mismatch: Optional[FunctionInfo] = None
-        non_mt_safe_call_in_mt_safe: Optional[FunctionInfo] = None
-        non_pure_call_in_pure: Optional[FunctionInfo] = None
+        reason: Optional[DiagnosticKind] = None

    def __init__(self):
        self._is_first_group = True
@@ -727,15 +855,12 @@ class TopDownSummaryPrinter():
        if func is None:
            func = TopDownSummaryPrinter.FunctionCallees(diag.source, set())
            self._funcs[usr] = func
+        func.reason = diag.kind
        if diag.kind == DiagnosticKind.ANNOTATIONS_DEF_DECL_MISMATCH:
            func.mismatch = diag.target
        else:
            func.calees.add(diag.target)
            self._unsafe_in_safe.add(diag.target.usr)
-            if diag.kind == DiagnosticKind.NON_MT_SAFE_CALL_IN_MT_SAFE_CTX:
-                func.non_mt_safe_call_in_mt_safe = diag.target
-            elif diag.kind == DiagnosticKind.NON_PURE_CALL_IN_PURE_CTX:
-                func.non_pure_call_in_pure = diag.target

    def print_summary(self, root_dir: str):
        row_groups: dict[str, list[list[str]]] = {}
@@ -748,12 +873,14 @@ class TopDownSummaryPrinter():

            row_group = []
            name = f"\"{func_info.name}\" "
-            if func.mismatch:
+            if func.reason == DiagnosticKind.ANNOTATIONS_DEF_DECL_MISMATCH:
                name += "declaration does not match definition"
-            elif func.non_mt_safe_call_in_mt_safe:
+            elif func.reason == DiagnosticKind.NON_MT_SAFE_CALL_IN_MT_SAFE_CTX:
                name += "is mtsafe but calls non-mtsafe function(s)"
-            elif func.non_pure_call_in_pure:
+            elif func.reason == DiagnosticKind.NON_PURE_CALL_IN_PURE_CTX:
                name += "is pure but calls non-pure function(s)"
+            elif func.reason == DiagnosticKind.NON_STABLE_TREE_CALL_IN_STABLE_TREE_CTX:
+                name += "is stable_tree but calls non-stable_tree or non-mtsafe"
            else:
                name += "for unknown reason (please add description)"

@@ -1,6 +1,6 @@
 *~
 *.old
-config_build.h
+config_package.h
 Makefile
 Makefile_obj
 .objcache*
@@ -47,7 +47,6 @@ set(HEADERS
    V3Case.h
    V3Cast.h
    V3CCtors.h
-    V3Cdc.h
    V3Class.h
    V3Clean.h
    V3Clock.h
@@ -83,6 +82,7 @@ set(HEADERS
    V3File.h
    V3FileLine.h
    V3Force.h
+    V3Fork.h
    V3FunctionTraits.h
    V3Gate.h
    V3Global.h
@@ -150,6 +150,7 @@ set(HEADERS
    V3SymTable.h
    V3Table.h
    V3Task.h
+    V3ThreadPool.h
    V3Timing.h
    V3Trace.h
    V3TraceDecl.h
@@ -186,7 +187,6 @@ set(COMMON_SOURCES
    V3CUse.cpp
    V3Case.cpp
    V3Cast.cpp
-    V3Cdc.cpp
    V3Class.cpp
    V3Clean.cpp
    V3Clock.cpp
@@ -228,6 +228,7 @@ set(COMMON_SOURCES
    V3File.cpp
    V3FileLine.cpp
    V3Force.cpp
+    V3Fork.cpp
    V3Gate.cpp
    V3Global.cpp
    V3Graph.cpp
@@ -283,6 +284,7 @@ set(COMMON_SOURCES
    V3Subst.cpp
    V3Table.cpp
    V3Task.cpp
+    V3ThreadPool.cpp
    V3Trace.cpp
    V3TraceDecl.cpp
    V3Tristate.cpp
@@ -322,7 +324,7 @@ file(TO_NATIVE_PATH ${srcdir}/../bin/verilator_includer VERILATOR_INCLUDER)
 file(TO_NATIVE_PATH ${srcdir}/vlcovgen VLCOVGEN)
 file(TO_NATIVE_PATH ${srcdir}/config_rev CONFIG_REV)

-configure_file(config_build.h.in config_build.h @ONLY)
+configure_file(config_package.h.in config_package.h @ONLY)

 add_custom_command(
    OUTPUT V3Ast__gen_forward_class_decls.h V3Dfg__gen_forward_class_decls.h
@@ -414,7 +416,7 @@ foreach(astgen_name ${ASTGENERATED_NAMES})
        MAIN_DEPENDENCY ${astgen_name}.cpp
        DEPENDS ${ASTGEN} V3Ast.h
        COMMAND ${PYTHON3} ARGS
-            ${ASTGEN} -I"${srcdir}" --astdef V3AstNodeDType.h --astdef V3AstNodeExpr.h --astdef V3AstNodeOther.h --dfgdef V3DfgVertices.h ${astgen_name}.cpp
+            ${ASTGEN} -I "${srcdir}" --astdef V3AstNodeDType.h --astdef V3AstNodeExpr.h --astdef V3AstNodeOther.h --dfgdef V3DfgVertices.h ${astgen_name}.cpp
    )
    list(APPEND GENERATED_FILES ${astgen_name}__gen.cpp)
 endforeach()
@@ -50,7 +50,7 @@ obj_dbg:
 .PHONY: ../bin/verilator_bin$(EXEEXT) ../bin/verilator_bin_dbg$(EXEEXT) ../bin/verilator_coverage_bin_dbg$(EXEEXT)

 opt: ../bin/verilator_bin$(EXEEXT)
-ifeq ($(VERILATOR_NO_OPT_BUILD),1)	# Faster laptop development... One build
+ifeq ($(VERILATOR_NO_OPT_BUILD),1)  # Faster laptop development... One build
 ../bin/verilator_bin$(EXEEXT): ../bin/verilator_bin_dbg$(EXEEXT)
 	-cp -p $< $@.tmp
 	-mv -f $@.tmp $@
@@ -70,7 +70,7 @@ dbg: ../bin/verilator_bin_dbg$(EXEEXT) ../bin/verilator_coverage_bin_dbg$(EXEEXT
 	$(MAKE) -C obj_dbg       TGT=../$@ VL_DEBUG=1 VL_VLCOV=1 -f ../Makefile_obj

 ifneq ($(VERILATOR_NO_OPT_BUILD),1)  # Faster laptop development... don't rebuild each commit
- ifneq ($(UNDER_GIT),)	# If local git tree... else don't burden users
+ ifneq ($(UNDER_GIT),)  # If local git tree... else don't burden users
 GIT_CHANGE_DEP = ${srcdir}/../.git/logs/HEAD
 endif
 endif
@@ -78,7 +78,7 @@ endif
 prefiles::
 prefiles:: config_rev.h
 # This output goes into srcdir if locally configured, as we need to distribute it as part of the kit.
-config_rev.h:	${srcdir}/config_rev $(GIT_CHANGE_DEP)
+config_rev.h: ${srcdir}/config_rev $(GIT_CHANGE_DEP)
 	$(PYTHON3) ${srcdir}/config_rev ${srcdir} >$@

 # Human convenience
@@ -95,7 +95,7 @@ clean mostlyclean distclean maintainer-clean::
 	-rm -f .objcache*

 distclean maintainer-clean::
-	-rm -f Makefile Makefile_obj config_build.h
+	-rm -f Makefile Makefile_obj config_package.h

 maintainer-clean::
 	-rm -f config_rev.h
@@ -92,11 +92,12 @@ endif
 # -lfl not needed as Flex invoked with %nowrap option
 LIBS = $(CFG_LIBS) -lm

+CPPFLAGS += -DVERILATOR_INTERNAL_
 CPPFLAGS += -MMD
 CPPFLAGS += -I. -I$(bldsrc) -I$(srcdir) -I$(incdir) -I../../include
-#CPPFLAGS += -DVL_LEAK_CHECKS 	# If running valgrind or other hunting tool
+#CPPFLAGS += -DVL_LEAK_CHECKS  # If running valgrind or other hunting tool
 CPPFLAGS += -MP # Only works on recent GCC versions
-ifeq ($(CFG_WITH_CCWARN),yes)	# Local... Else don't burden users
+ifeq ($(CFG_WITH_CCWARN),yes)  # Local... Else don't burden users
 CPPFLAGS += -W -Wall $(CFG_CXXFLAGS_WEXTRA) $(CFG_CXXFLAGS_SRC) -Werror
 #CPPFLAGS += -pedantic-errors
 else
@@ -114,7 +115,7 @@ ifeq ($(CFG_WITH_DEFENV),yes)
 CPPFLAGS += -DDEFENV_SYSTEMC_ARCH=\"$(SYSTEMC_ARCH)\"
 CPPFLAGS += -DDEFENV_SYSTEMC_INCLUDE=\"$(SYSTEMC_INCLUDE)\"
 CPPFLAGS += -DDEFENV_SYSTEMC_LIBDIR=\"$(SYSTEMC_LIBDIR)\"
- ifeq ($(VERILATOR_ROOT),)	# Use what we're given, or intuit
+ ifeq ($(VERILATOR_ROOT),)  # Use what we're given, or intuit
  CPPFLAGS += -DDEFENV_VERILATOR_ROOT=\"$(pkgdatadir)\"
 else
  CPPFLAGS += -DDEFENV_VERILATOR_ROOT=\"$(VERILATOR_ROOT)\"
@@ -155,7 +156,7 @@ RAW_OBJS = \
 	V3ActiveTop.o \
 	V3Assert.o \
 	V3AssertPre.o \
-	V3Ast.o	\
+	V3Ast.o \
 	V3AstNodes.o \
 	V3Begin.o \
 	V3Branch.o \
@@ -164,7 +165,6 @@ RAW_OBJS = \
 	V3CUse.o \
 	V3Case.o \
 	V3Cast.o \
-	V3Cdc.o \
 	V3Class.o \
 	V3Clean.o \
 	V3Clock.o \
@@ -205,6 +205,7 @@ RAW_OBJS = \
 	V3File.o \
 	V3FileLine.o \
 	V3Force.o \
+	V3Fork.o \
 	V3Gate.o \
 	V3Global.o \
 	V3Graph.o \
@@ -265,6 +266,7 @@ RAW_OBJS = \
 	V3TSP.o \
 	V3Table.o \
 	V3Task.o \
+	V3ThreadPool.o \
 	V3Timing.o \
 	V3Trace.o \
 	V3TraceDecl.o \
@@ -322,26 +324,26 @@ V3Number_test: V3Number_test.o

 #### Modules

-%__gen.cpp:	%.cpp $(ASTGEN) $(AST_DEFS) $(DFG_DEFS)
+%__gen.cpp: %.cpp $(ASTGEN) $(AST_DEFS) $(DFG_DEFS)
 	$(PYTHON3) $(ASTGEN) $(ASTGENFLAGS) $*.cpp

 .SECONDARY:

-%.o:	%.cpp
+%.o: %.cpp
 	$(OBJCACHE) ${CXX} ${CXXFLAGS} ${CPPFLAGSWALL} -c $< -o $@
-%.o:	%.c
+%.o: %.c
 	$(OBJCACHE) ${CC}  ${CFLAGS} ${CPPFLAGSWALL} -c $< -o $@

-V3ParseLex.o:	V3ParseLex.cpp V3Lexer.yy.cpp V3ParseBison.c
+V3ParseLex.o: V3ParseLex.cpp V3Lexer.yy.cpp V3ParseBison.c
 	$(OBJCACHE) ${CXX} ${CXXFLAGS} ${CPPFLAGSPARSER} -c $< -o $@

-V3ParseGrammar.o:	V3ParseGrammar.cpp V3ParseBison.c
+V3ParseGrammar.o: V3ParseGrammar.cpp V3ParseBison.c
 	$(OBJCACHE) ${CXX} ${CXXFLAGS} ${CPPFLAGSPARSER} -c $< -o $@

-V3ParseImp.o:	V3ParseImp.cpp V3ParseBison.c
+V3ParseImp.o: V3ParseImp.cpp V3ParseBison.c
 	$(OBJCACHE) ${CXX} ${CXXFLAGS} ${CPPFLAGSPARSER} -c $< -o $@

-V3PreProc.o:	V3PreProc.cpp V3PreLex.yy.cpp
+V3PreProc.o: V3PreProc.cpp V3PreLex.yy.cpp
 	$(OBJCACHE) ${CXX} ${CXXFLAGS} ${CPPFLAGSPARSER} -c $< -o $@

 #### Generated files
@@ -365,14 +367,14 @@ V3ParseBison.c: verilog.y $(BISONPRE)
 	@echo "If you get errors from verilog.y below, try upgrading bison to version 1.875 or newer."
 	$(PYTHON3) $(BISONPRE) --yacc ${YACC} -d -v -o V3ParseBison.c $<

-V3Lexer_pregen.yy.cpp:	verilog.l V3ParseBison.h $(HEADERS)
+V3Lexer_pregen.yy.cpp: verilog.l V3ParseBison.h $(HEADERS)
 	${LEX} --version
 	${LEX} ${LFLAGS} -o$@ $<

-V3Lexer.yy.cpp:	V3Lexer_pregen.yy.cpp $(FLEXFIX)
+V3Lexer.yy.cpp: V3Lexer_pregen.yy.cpp $(FLEXFIX)
 	$(PYTHON3) $(FLEXFIX) V3Lexer <$< >$@

-V3PreLex_pregen.yy.cpp:	V3PreLex.l $(HEADERS)
+V3PreLex_pregen.yy.cpp: V3PreLex.l $(HEADERS)
 	${LEX} --version
 	${LEX} ${LFLAGS} -o$@ $<

@@ -54,7 +54,7 @@ private:
    const string m_name;  // Only used for .dot file generation
    const VertexType m_type;  // Vertex type (BLOCK/BRANCH/OUTPUT)

-    string typestr() const {  //   "
+    string typestr() const VL_MT_SAFE {  //   "
        switch (m_type) {
        case VT_BLOCK: return "(||)";  // basic block node
        case VT_BRANCH: return "(&&)";  // if/else branch mode
@@ -68,7 +68,7 @@ public:
        : V3GraphVertex{graphp}
        , m_name{name}
        , m_type{type} {}
-    string name() const override { return m_name + " " + typestr(); }
+    string name() const override VL_MT_STABLE { return m_name + " " + typestr(); }
    string dotColor() const override { return user() ? "green" : "black"; }
    virtual int type() const { return m_type; }
 };
@@ -183,7 +183,7 @@ public:
                        << " (not all control paths of combinational always assign a value)\n"
                        << nodep->warnMore()
                        << "... Suggest use of always_latch for intentional latches");
-                if (dumpGraph() >= 9) dumpDotFilePrefixed("latch_" + vrp->name());
+                if (dumpGraphLevel() >= 9) dumpDotFilePrefixed("latch_" + vrp->name());
            }
            vertp->user(false);  // Clear again (see above)
            vrp->varp()->isLatched(latch_detected);
@@ -309,7 +309,7 @@ AstActive*& ActiveNamer::getSpecialActive<AstSenItem::Combo>() {
 //######################################################################
 // Latch checking visitor

-class ActiveLatchCheckVisitor final : public VNVisitor {
+class ActiveLatchCheckVisitor final : public VNVisitorConst {
 private:
    // NODE STATE
    // Input:
@@ -320,7 +320,8 @@ private:
    // VISITORS
    void visit(AstVarRef* nodep) override {
        const AstVar* const varp = nodep->varp();
-        if (nodep->access().isWriteOrRW() && varp->isSignal() && !varp->isUsedLoopIdx()) {
+        if (nodep->access().isWriteOrRW() && varp->isSignal() && !varp->isUsedLoopIdx()
+            && !varp->isFuncLocalSticky()) {
            m_graph.addAssignment(nodep);
        }
    }
@@ -329,20 +330,22 @@ private:
            LatchDetectGraphVertex* const parentp = m_graph.currentp();
            LatchDetectGraphVertex* const branchp = m_graph.addPathVertex(parentp, "BRANCH", true);
            m_graph.addPathVertex(branchp, "IF");
-            iterateAndNextNull(nodep->thensp());
+            iterateAndNextConstNull(nodep->thensp());
            m_graph.addPathVertex(branchp, "ELSE");
-            iterateAndNextNull(nodep->elsesp());
+            iterateAndNextConstNull(nodep->elsesp());
            m_graph.currentp(parentp);
+        } else {
+            iterateChildrenConst(nodep);
        }
    }
    //--------------------
-    void visit(AstNode* nodep) override { iterateChildren(nodep); }
+    void visit(AstNode* nodep) override { iterateChildrenConst(nodep); }

 public:
    // CONSTRUCTORS
    ActiveLatchCheckVisitor(AstNode* nodep, bool expectLatch) {
        m_graph.begin();
-        iterate(nodep);
+        iterateConst(nodep);
        m_graph.latchCheck(nodep, expectLatch);
    }
    ~ActiveLatchCheckVisitor() override = default;
@@ -652,5 +655,5 @@ public:
 void V3Active::activeAll(AstNetlist* nodep) {
    UINFO(2, __FUNCTION__ << ": " << endl);
    { ActiveVisitor{nodep}; }  // Destruct before checking
-    V3Global::dumpCheckGlobalTree("active", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("active", 0, dumpTreeLevel() >= 3);
 }
@@ -145,5 +145,5 @@ public:
 void V3ActiveTop::activeTopAll(AstNetlist* nodep) {
    UINFO(2, __FUNCTION__ << ": " << endl);
    { ActiveTopVisitor{nodep}; }  // Destruct before checking
-    V3Global::dumpCheckGlobalTree("activetop", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("activetop", 0, dumpTreeLevel() >= 3);
 }
@@ -20,6 +20,7 @@
 #include "V3Assert.h"

 #include "V3Ast.h"
+#include "V3Error.h"
 #include "V3Global.h"
 #include "V3Stats.h"

@@ -43,6 +44,7 @@ private:
    AstVar* m_monitorOffVarp = nullptr;  // $monitoroff variable
    unsigned m_modPastNum = 0;  // Module past numbering
    unsigned m_modStrobeNum = 0;  // Module $strobe numbering
+    const AstNodeProcedure* m_procedurep = nullptr;  // Current procedure
    VDouble0 m_statCover;  // Statistic tracking
    VDouble0 m_statAsNotImm;  // Statistic tracking
    VDouble0 m_statAsImm;  // Statistic tracking
@@ -50,14 +52,22 @@ private:
    bool m_inSampled = false;  // True inside a sampled expression

    // METHODS
-    string assertDisplayMessage(AstNode* nodep, const string& prefix, const string& message) {
-        return (string("[%0t] " + prefix + ": ") + nodep->fileline()->filebasename() + ":"
-                + cvtToStr(nodep->fileline()->lineno()) + ": Assertion failed in %m"
-                + ((message != "") ? ": " : "") + message + "\n");
+    string assertDisplayMessage(AstNode* nodep, const string& prefix, const string& message,
+                                VDisplayType severity) {
+        if (severity == VDisplayType::DT_ERROR || severity == VDisplayType::DT_FATAL) {
+            return (string{"[%0t] " + prefix + ": "} + nodep->fileline()->filebasename() + ":"
+                    + cvtToStr(nodep->fileline()->lineno()) + ": Assertion failed in %m"
+                    + ((message != "") ? ": " : "") + message + "\n");
+        } else {
+            return (string{"[%0t] " + prefix + ": "} + nodep->fileline()->filebasename() + ":"
+                    + cvtToStr(nodep->fileline()->lineno()) + ": %m"
+                    + ((message != "") ? ": " : "") + message + "\n");
+        }
    }
    void replaceDisplay(AstDisplay* nodep, const string& prefix) {
+        nodep->fmtp()->text(
+            assertDisplayMessage(nodep, prefix, nodep->fmtp()->text(), nodep->displayType()));
        nodep->displayType(VDisplayType::DT_WRITE);
-        nodep->fmtp()->text(assertDisplayMessage(nodep, prefix, nodep->fmtp()->text()));
        // cppcheck-suppress nullPointer
        AstNodeExpr* const timenewp = new AstTime{nodep->fileline(), m_modp->timeunit()};
        if (AstNodeExpr* const timesp = nodep->fmtp()->exprsp()) {
@@ -145,6 +155,11 @@ private:
        } else {
            UASSERT_OBJ(sentreep, nodep, "Concurrent assertions must have sensitivity");
            sentreep->unlinkFrBack();
+            if (m_procedurep) {
+                // To support this need queue of asserts to activate
+                nodep->v3error("Unsupported: Procedural concurrent assertion with"
+                               " clocking event inside always (IEEE 1800-2917 16.14.6)");
+            }
        }
        //
        AstNode* bodysp = nullptr;
@@ -176,7 +191,7 @@ private:
            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.");
+            if (!passsp && !failsp) failsp = newFireAssertUnchecked(nodep, "'assert' failed.");
            ifp = new AstIf{nodep->fileline(), propp, passsp, failsp};
            ifp->isBoundsCheck(true);  // To avoid LATCH warning
            // It's more LIKELY that we'll take the nullptr if clause
@@ -350,8 +365,7 @@ private:
        AstNodeExpr* const exprp = nodep->exprp()->unlinkFrBack();
        AstNodeExpr* inp = newSampledExpr(exprp);
        AstVar* invarp = nullptr;
-        AstSenTree* const sentreep = nodep->sentreep();
-        sentreep->unlinkFrBack();
+        AstSenTree* const sentreep = nodep->sentreep()->unlinkFrBack();
        AstAlways* const alwaysp
            = new AstAlways{nodep->fileline(), VAlwaysKwd::ALWAYS, sentreep, nullptr};
        m_modp->addStmtsp(alwaysp);
@@ -414,9 +428,10 @@ private:
            replaceDisplay(nodep, "-Info");
        } else if (nodep->displayType() == VDisplayType::DT_WARNING) {
            replaceDisplay(nodep, "%%Warning");
-        } else if (nodep->displayType() == VDisplayType::DT_ERROR
-                   || nodep->displayType() == VDisplayType::DT_FATAL) {
+        } else if (nodep->displayType() == VDisplayType::DT_ERROR) {
            replaceDisplay(nodep, "%%Error");
+        } else if (nodep->displayType() == VDisplayType::DT_FATAL) {
+            replaceDisplay(nodep, "%%Fatal");
        } else if (nodep->displayType() == VDisplayType::DT_MONITOR) {
            nodep->displayType(VDisplayType::DT_DISPLAY);
            const auto fl = nodep->fileline();
@@ -496,6 +511,11 @@ private:
            iterateChildren(nodep);
        }
    }
+    void visit(AstNodeProcedure* nodep) override {
+        VL_RESTORER(m_procedurep);
+        m_procedurep = nodep;
+        iterateChildren(nodep);
+    }
    void visit(AstBegin* nodep) override {
        // This code is needed rather than a visitor in V3Begin,
        // because V3Assert is called before V3Begin
@@ -525,5 +545,5 @@ public:
 void V3Assert::assertAll(AstNetlist* nodep) {
    UINFO(2, __FUNCTION__ << ": " << endl);
    { AssertVisitor{nodep}; }  // Destruct before checking
-    V3Global::dumpCheckGlobalTree("assert", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("assert", 0, dumpTreeLevel() >= 3);
 }
@@ -21,7 +21,6 @@
 #include "verilatedos.h"

 #include "V3Ast.h"
-#include "V3Error.h"

 //============================================================================

@@ -63,9 +63,10 @@ private:

    // METHODS

-    AstSenTree* newSenTree(AstNode* nodep) {
+    AstSenTree* newSenTree(AstNode* nodep, AstSenTree* useTreep = nullptr) {
        // Create sentree based on clocked or default clock
        // Return nullptr for always
+        if (useTreep) return useTreep;
        AstSenTree* newp = nullptr;
        AstSenItem* senip = m_senip;
        if (!senip && m_defaultClockingp) senip = m_defaultClockingp->sensesp();
@@ -228,7 +229,7 @@ private:
                //     always queue.push(<sampled var>);
                AstCMethodHard* const pushp = new AstCMethodHard{
                    flp, new AstVarRef{flp, queueVarp, VAccess::WRITE}, "push",
-                    new AstTime(nodep->fileline(), m_modp->timeunit())};
+                    new AstTime{nodep->fileline(), m_modp->timeunit()}};
                pushp->addPinsp(exprp->cloneTree(false));
                pushp->dtypeSetVoid();
                m_clockingp->addNextHere(
@@ -237,7 +238,7 @@ private:
                //     always @<clocking event> queue.pop(<skew>, /*out*/<skewed var>});
                AstCMethodHard* const popp = new AstCMethodHard{
                    flp, new AstVarRef{flp, queueVarp, VAccess::READWRITE}, "pop",
-                    new AstTime(nodep->fileline(), m_modp->timeunit())};
+                    new AstTime{nodep->fileline(), m_modp->timeunit()}};
                popp->addPinsp(skewp->unlinkFrBack());
                popp->addPinsp(refp);
                popp->dtypeSetVoid();
@@ -362,17 +363,19 @@ private:
        clearAssertInfo();
    }
    void visit(AstFell* nodep) override {
-        if (nodep->sentreep()) return;  // Already processed
+        if (nodep->user1SetOnce()) return;
        iterateChildren(nodep);
        FileLine* const fl = nodep->fileline();
        AstNodeExpr* exprp = nodep->exprp()->unlinkFrBack();
        if (exprp->width() > 1) exprp = new AstSel{fl, exprp, 0, 1};
+        AstSenTree* sentreep = nodep->sentreep();
+        if (sentreep) sentreep->unlinkFrBack();
        AstNodeExpr* const past = new AstPast{fl, exprp, nullptr};
        past->dtypeFrom(exprp);
        exprp = new AstAnd{fl, past, new AstNot{fl, exprp->cloneTree(false)}};
        exprp->dtypeSetBit();
        nodep->replaceWith(exprp);
-        nodep->sentreep(newSenTree(nodep));
+        nodep->sentreep(newSenTree(nodep, sentreep));
        VL_DO_DANGLING(pushDeletep(nodep), nodep);
    }
    void visit(AstPast* nodep) override {
@@ -381,30 +384,34 @@ private:
        nodep->sentreep(newSenTree(nodep));
    }
    void visit(AstRose* nodep) override {
-        if (nodep->sentreep()) return;  // Already processed
+        if (nodep->user1SetOnce()) return;
        iterateChildren(nodep);
        FileLine* const fl = nodep->fileline();
        AstNodeExpr* exprp = nodep->exprp()->unlinkFrBack();
        if (exprp->width() > 1) exprp = new AstSel{fl, exprp, 0, 1};
+        AstSenTree* sentreep = nodep->sentreep();
+        if (sentreep) sentreep->unlinkFrBack();
        AstNodeExpr* const past = new AstPast{fl, exprp, nullptr};
        past->dtypeFrom(exprp);
        exprp = new AstAnd{fl, new AstNot{fl, past}, exprp->cloneTree(false)};
        exprp->dtypeSetBit();
        nodep->replaceWith(exprp);
-        nodep->sentreep(newSenTree(nodep));
+        nodep->sentreep(newSenTree(nodep, sentreep));
        VL_DO_DANGLING(pushDeletep(nodep), nodep);
    }
    void visit(AstStable* nodep) override {
-        if (nodep->sentreep()) return;  // Already processed
+        if (nodep->user1SetOnce()) return;
        iterateChildren(nodep);
        FileLine* const fl = nodep->fileline();
        AstNodeExpr* exprp = nodep->exprp()->unlinkFrBack();
+        AstSenTree* sentreep = nodep->sentreep();
+        if (sentreep) sentreep->unlinkFrBack();
        AstNodeExpr* const past = new AstPast{fl, exprp, nullptr};
        past->dtypeFrom(exprp);
        exprp = new AstEq{fl, past, exprp->cloneTree(false)};
        exprp->dtypeSetBit();
        nodep->replaceWith(exprp);
-        nodep->sentreep(newSenTree(nodep));
+        nodep->sentreep(newSenTree(nodep, sentreep));
        VL_DO_DANGLING(pushDeletep(nodep), nodep);
    }

@@ -489,5 +496,5 @@ public:
 void V3AssertPre::assertPreAll(AstNetlist* nodep) {
    UINFO(2, __FUNCTION__ << ": " << endl);
    { AssertPreVisitor{nodep}; }  // Destruct before checking
-    V3Global::dumpCheckGlobalTree("assertpre", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("assertpre", 0, dumpTreeLevel() >= 3);
 }
@@ -87,8 +87,8 @@ string AstNode::encodeName(const string& namein) {
    // Encode signal name raw from parser, then not called again on same signal
    string out;
    for (string::const_iterator pos = namein.begin(); pos != namein.end(); ++pos) {
-        if ((pos == namein.begin()) ? isalpha(pos[0])  // digits can't lead identifiers
-                                    : isalnum(pos[0])) {
+        if ((pos == namein.begin()) ? std::isalpha(pos[0])  // digits can't lead identifiers
+                                    : std::isalnum(pos[0])) {
            out += pos[0];
        } else if (pos[0] == '_') {
            if (pos[1] == '_') {
@@ -155,10 +155,9 @@ string AstNode::vcdName(const string& namein) {
    return prettyName(pretty);
 }

-string AstNode::prettyName(const string& namein) {
+string AstNode::prettyName(const string& namein) VL_PURE {
    // This function is somewhat hot, so we short-circuit some compares
    string pretty;
-    pretty = "";
    pretty.reserve(namein.length());
    for (const char* pos = namein.c_str(); *pos;) {
        if (pos[0] == '-' && pos[1] == '>') {  // ->
@@ -187,11 +186,14 @@ string AstNode::prettyName(const string& namein) {
                pos += 7;
                continue;
            }
-            if (pos[0] == '_' && pos[1] == '_' && pos[2] == '0' && isxdigit(pos[3])
-                && isxdigit(pos[4])) {
+            if (pos[0] == '_' && pos[1] == '_' && pos[2] == '0' && std::isxdigit(pos[3])
+                && std::isxdigit(pos[4])) {
                char value = 0;
-                value += 16 * (isdigit(pos[3]) ? (pos[3] - '0') : (tolower(pos[3]) - 'a' + 10));
-                value += (isdigit(pos[4]) ? (pos[4] - '0') : (tolower(pos[4]) - 'a' + 10));
+                value += 16
+                         * (std::isdigit(pos[3]) ? (pos[3] - '0')
+                                                 : (std::tolower(pos[3]) - 'a' + 10));
+                value
+                    += (std::isdigit(pos[4]) ? (pos[4] - '0') : (std::tolower(pos[4]) - 'a' + 10));
                pretty += value;
                pos += 5;
                continue;
@@ -206,6 +208,81 @@ string AstNode::prettyName(const string& namein) {
    return pretty;
 }

+string AstNode::vpiName(const string& namein) {
+    // This is slightly different from prettyName, in that when we encounter escaped characters,
+    // we change that identifier to an escaped identifier, wrapping it with '\' and ' '
+    // as specified in LRM 23.6
+    string pretty;
+    pretty.reserve(namein.length());
+    bool inEscapedIdent = false;
+    int lastIdent = 0;
+
+    for (const char* pos = namein.c_str(); *pos;) {
+        char specialChar = 0;
+        if (pos[0] == '-' && pos[1] == '>') {  // ->
+            specialChar = '.';
+            pos += 2;
+        } else if (pos[0] == '_' && pos[1] == '_') {  // __
+            if (0 == std::strncmp(pos, "__BRA__", 7)) {
+                specialChar = '[';
+                pos += 7;
+            } else if (0 == std::strncmp(pos, "__KET__", 7)) {
+                specialChar = ']';
+                pos += 7;
+            } else if (0 == std::strncmp(pos, "__DOT__", 7)) {
+                specialChar = '.';
+                pos += 7;
+            } else if (0 == std::strncmp(pos, "__PVT__", 7)) {
+                pos += 7;
+                continue;
+            } else if (pos[0] == '_' && pos[1] == '_' && pos[2] == '0' && std::isxdigit(pos[3])
+                       && std::isxdigit(pos[4])) {
+                char value = 0;
+                value += 16
+                         * (std::isdigit(pos[3]) ? (pos[3] - '0')
+                                                 : (std::tolower(pos[3]) - 'a' + 10));
+                value
+                    += (std::isdigit(pos[4]) ? (pos[4] - '0') : (std::tolower(pos[4]) - 'a' + 10));
+
+                // __ doesn't always imply escaped ident
+                if (value != '_') inEscapedIdent = true;
+
+                pretty += value;
+                pos += 5;
+                continue;
+            }
+        } else if (pos[0] == '.') {
+            specialChar = '.';
+            ++pos;
+        }
+
+        if (specialChar) {
+            if (inEscapedIdent && (specialChar == '[' || specialChar == '.')) {
+                pretty += " ";
+                pretty.insert(lastIdent, "\\");
+                inEscapedIdent = false;
+            }
+
+            pretty += specialChar;
+
+            if (specialChar == ']' || specialChar == '.') {
+                lastIdent = pretty.length();
+                inEscapedIdent = false;
+            }
+        } else {
+            pretty += pos[0];
+            ++pos;
+        }
+    }
+    if (inEscapedIdent) {
+        pretty += " ";
+        pretty.insert(lastIdent, "\\");
+    }
+    if (pretty[0] == 'T' && pretty.substr(0, 4) == "TOP.") pretty.replace(0, 4, "");
+    if (pretty[0] == 'T' && pretty.substr(0, 5) == "TOP->") pretty.replace(0, 5, "");
+    return pretty;
+}
+
 string AstNode::prettyTypeName() const {
    if (name() == "") return typeName();
    return std::string{typeName()} + " '" + prettyName() + "'";
@@ -219,17 +296,19 @@ void AstNode::debugTreeChange(const AstNode* nodep, const char* prefix, int line
 // Called on all major tree changers.
 // Only for use for those really nasty bugs relating to internals
 // Note this may be null.
-// if (debug()) cout<<"-treeChange: V3Ast.cpp:"<<lineno<<" Tree Change for "
-//                 <<prefix<<": "<<cvtToHex(this)<<" <e"<<AstNode::s_editCntGbl<<">"<<endl;
+// if (debug() && nodep) cout << "-treeChange: V3Ast.cpp:" << lineno
+//          << " Tree Change for " << prefix << ": "
+//          << cvtToHex(nodep) << " <e" << AstNode::s_editCntGbl << ">"
+//          << "m_iterpp=" << (void*)nodep->m_iterpp << endl;
 // if (debug()) {
 //  cout<<"-treeChange: V3Ast.cpp:"<<lineno<<" Tree Change for "<<prefix<<endl;
 //  // Commenting out the section below may crash, as the tree state
 //  // between edits is not always consistent for printing
 //  cout<<"-treeChange: V3Ast.cpp:"<<lineno<<" Tree Change for "<<prefix<<endl;
 //  v3Global.rootp()->dumpTree("-  treeChange: ");
-//  if (next||1) this->dumpTreeAndNext(cout, prefix);
-//  else this->dumpTree(prefix);
-//  this->checkTree();
+//  if (next||1) nodep->dumpTreeAndNext(cout, prefix);
+//  else nodep->dumpTree(prefix);
+//  nodep->checkTree();
 //  v3Global.rootp()->checkTree();
 //}
 #endif
@@ -268,7 +347,8 @@ AstNode* AstNode::addNext<AstNode, AstNode>(AstNode* nodep, AstNode* newp) {
        newtailp->m_headtailp = headp;
        headp->m_headtailp = newtailp;
        newp->editCountInc();
-        if (oldtailp->m_iterpp) *(oldtailp->m_iterpp) = newp;  // Iterate on new item
+        // No change of m_iterpp, as only changing m_nextp of current node;
+        // the current node is still the one at the iteration point
    }
    debugTreeChange(nodep, "-addNextOut:", __LINE__, true);
    return nodep;
@@ -318,7 +398,8 @@ void AstNode::addNextHere(AstNode* newp) {
        }  // else is head, and we're inserting into the middle, so no other change
    }

-    if (this->m_iterpp) *(this->m_iterpp) = newp;  // Iterate on new item
+    // No change of m_iterpp, as adding after current node;
+    // the current node is still the one at the iteration point
    debugTreeChange(this, "-addHereOut: ", __LINE__, true);
 }

@@ -486,8 +567,10 @@ AstNode* AstNode::unlinkFrBackWithNext(VNRelinker* linkerp) {
    // Relink
    oldp->m_backp = nullptr;
    // Iterator fixup
-    if (oldp->m_iterpp) *(oldp->m_iterpp) = nullptr;
-    oldp->m_iterpp = nullptr;
+    if (oldp->m_iterpp) {
+        *(oldp->m_iterpp) = nullptr;
+        oldp->m_iterpp = nullptr;
+    }
    debugTreeChange(oldp, "-unlinkWNextOut: ", __LINE__, true);
    return oldp;
 }
@@ -501,7 +584,11 @@ AstNode* AstNode::unlinkFrBack(VNRelinker* linkerp) {
    if (linkerp) {
        linkerp->m_oldp = oldp;
        linkerp->m_backp = backp;
-        linkerp->m_iterpp = oldp->m_iterpp;
+        if (oldp->m_iterpp) {  // Assumes we will always relink() if want to keep iterating
+            linkerp->m_iterpp = oldp->m_iterpp;
+            *(oldp->m_iterpp) = nullptr;
+            oldp->m_iterpp = nullptr;
+        }
        if (backp->m_nextp == oldp) {
            linkerp->m_chg = VNRelinker::RELINK_NEXT;
        } else if (backp->m_op1p == oldp) {
@@ -546,12 +633,15 @@ AstNode* AstNode::unlinkFrBack(VNRelinker* linkerp) {
        }
    }
    // Iterator fixup
-    if (oldp->m_iterpp) *(oldp->m_iterpp) = oldp->m_nextp;
+    if (oldp->m_iterpp) {  // Only if no linker, point to next in list
+        if (oldp->m_nextp) oldp->m_nextp->m_iterpp = oldp->m_iterpp;
+        *(oldp->m_iterpp) = oldp->m_nextp;
+        oldp->m_iterpp = nullptr;
+    }
    // Relink
    oldp->m_nextp = nullptr;
    oldp->m_backp = nullptr;
-    oldp->m_headtailp = this;
-    oldp->m_iterpp = nullptr;
+    oldp->m_headtailp = oldp;
    debugTreeChange(oldp, "-unlinkFrBkOut: ", __LINE__, true);
    return oldp;
 }
@@ -589,12 +679,12 @@ void AstNode::relink(VNRelinker* linkerp) {
    // Iterator fixup
    if (linkerp->m_iterpp) {
        // If we're iterating over a next() link, we need to follow links off the
-        // NEW node.  Thus we pass iteration information via a pointer in the node.
+        // NEW node, which is always assumed to be what we are relinking to.
        // This adds a unfortunate hot 8 bytes to every AstNode, but is faster than passing
        // across every function.
        // If anyone has a cleaner way, I'd be grateful.
-        *(linkerp->m_iterpp) = newp;
        newp->m_iterpp = linkerp->m_iterpp;
+        *(newp->m_iterpp) = newp;
    }
    // Empty the linker so not used twice accidentally
    linkerp->m_backp = nullptr;
@@ -756,6 +846,7 @@ void AstNode::deleteNode() {
    this->m_op2p = reinterpret_cast<AstNode*>(0x1);
    this->m_op3p = reinterpret_cast<AstNode*>(0x1);
    this->m_op4p = reinterpret_cast<AstNode*>(0x1);
+    this->m_iterpp = reinterpret_cast<AstNode**>(0x1);
    if (
 #if !defined(VL_DEBUG) || defined(VL_LEAK_CHECKS)
        true
@@ -830,7 +921,7 @@ void AstNode::iterateChildren(VNVisitor& v) {
    if (m_op4p) m_op4p->iterateAndNext(v);
 }

-void AstNode::iterateChildrenConst(VNVisitor& v) {
+void AstNode::iterateChildrenConst(VNVisitorConst& v) {
    // This is a very hot function
    ASTNODE_PREFETCH(m_op1p);
    ASTNODE_PREFETCH(m_op2p);
@@ -871,13 +962,13 @@ void AstNode::iterateAndNext(VNVisitor& v) {
        niterp->m_iterpp = nullptr;
        if (VL_UNLIKELY(niterp != nodep)) {  // Edited node inside accept
            nodep = niterp;
-        } else {  // Unchanged node, just continue loop
+        } else {  // Unchanged node (though maybe updated m_next), just continue loop
            nodep = niterp->m_nextp;
        }
    }
 }

-void AstNode::iterateListBackwards(VNVisitor& v) {
+void AstNode::iterateListBackwardsConst(VNVisitorConst& v) {
    AstNode* nodep = this;
    while (nodep->m_nextp) nodep = nodep->m_nextp;
    while (nodep) {
@@ -891,14 +982,14 @@ void AstNode::iterateListBackwards(VNVisitor& v) {
    }
 }

-void AstNode::iterateChildrenBackwards(VNVisitor& v) {
-    if (m_op1p) m_op1p->iterateListBackwards(v);
-    if (m_op2p) m_op2p->iterateListBackwards(v);
-    if (m_op3p) m_op3p->iterateListBackwards(v);
-    if (m_op4p) m_op4p->iterateListBackwards(v);
+void AstNode::iterateChildrenBackwardsConst(VNVisitorConst& v) {
+    if (m_op1p) m_op1p->iterateListBackwardsConst(v);
+    if (m_op2p) m_op2p->iterateListBackwardsConst(v);
+    if (m_op3p) m_op3p->iterateListBackwardsConst(v);
+    if (m_op4p) m_op4p->iterateListBackwardsConst(v);
 }

-void AstNode::iterateAndNextConst(VNVisitor& v) {
+void AstNode::iterateAndNextConst(VNVisitorConst& v) {
    // Keep following the current list even if edits change it
    AstNode* nodep = this;
    do {
@@ -988,10 +1079,12 @@ bool AstNode::sameTreeIter(const AstNode* node1p, const AstNode* node2p, bool ig
    // private: Return true if the two trees are identical
    if (!node1p && !node2p) return true;
    if (!node1p || !node2p) return false;
-    if (node1p->type() != node2p->type() || node1p->dtypep() != node2p->dtypep()
-        || !node1p->same(node2p) || (gateOnly && !node1p->isGateOptimizable())) {
-        return false;
-    }
+    if (node1p->type() != node2p->type()) return false;
+    UASSERT_OBJ(
+        (!node1p->dtypep() && !node2p->dtypep()) || (node1p->dtypep() && node2p->dtypep()), node1p,
+        "Comparison of a node with dtypep() with a node without dtypep()\n-node2=" << node2p);
+    if (node1p->dtypep() && !node1p->dtypep()->similarDType(node2p->dtypep())) return false;
+    if (!node1p->same(node2p) || (gateOnly && !node1p->isGateOptimizable())) return false;
    return (sameTreeIter(node1p->m_op1p, node2p->m_op1p, false, gateOnly)
            && sameTreeIter(node1p->m_op2p, node2p->m_op2p, false, gateOnly)
            && sameTreeIter(node1p->m_op3p, node2p->m_op3p, false, gateOnly)
@@ -1002,7 +1095,7 @@ bool AstNode::sameTreeIter(const AstNode* node1p, const AstNode* node2p, bool ig
 //======================================================================
 // Debugging

-void AstNode::checkTreeIter(const AstNode* prevBackp) const {
+void AstNode::checkTreeIter(const AstNode* prevBackp) const VL_MT_STABLE {
    // private: Check a tree and children
    UASSERT_OBJ(prevBackp == this->backp(), this, "Back node inconsistent");
    switch (this->type()) {
@@ -1052,7 +1145,7 @@ void AstNode::checkIter() const {
    if (m_iterpp) {
        dumpPtrs(cout);
        // Perhaps something forgot to clear m_iterpp?
-        this->v3fatalSrc("Iteration link should be nullptr");
+        this->v3fatalSrc("Iteration link m_iterpp should be nullptr");
    }
 }

@@ -1124,7 +1217,7 @@ void AstNode::dumpTreeFile(const string& filename, bool append, bool doDump, boo
            if (logsp->fail()) v3fatal("Can't write " << filename);
            *logsp << "Verilator Tree Dump (format 0x3900) from <e" << std::dec << editCountLast();
            *logsp << "> to <e" << std::dec << editCountGbl() << ">\n";
-            if (editCountGbl() == editCountLast() && ::dumpTree() < 9) {
+            if (editCountGbl() == editCountLast() && ::dumpTreeLevel() < 9) {
                *logsp << '\n';
                *logsp << "No changes since last dump!\n";
            } else {
@@ -1134,7 +1227,7 @@ void AstNode::dumpTreeFile(const string& filename, bool append, bool doDump, boo
        }
    }
    if (doDump && v3Global.opt.debugEmitV()) V3EmitV::debugEmitV(filename + ".v");
-    if (doCheck && (v3Global.opt.debugCheck() || ::dumpTree())) {
+    if (doCheck && (v3Global.opt.debugCheck() || ::dumpTreeLevel())) {
        // Error check
        checkTree();
        // Broken isn't part of check tree because it can munge iterp's
@@ -1186,7 +1279,17 @@ void AstNode::dumpTreeDotFile(const string& filename, bool append, bool doDump)
    }
 }

-void AstNode::v3errorEndFatal(std::ostringstream& str) const VL_MT_SAFE {
+bool AstNode::isTreePureRecurse() const {
+    // Should memoize this if call commonly
+    if (!this->isPure()) return false;
+    if (this->op1p() && !this->op1p()->isTreePureRecurse()) return false;
+    if (this->op2p() && !this->op2p()->isTreePureRecurse()) return false;
+    if (this->op3p() && !this->op3p()->isTreePureRecurse()) return false;
+    if (this->op4p() && !this->op4p()->isTreePureRecurse()) return false;
+    return true;
+}
+
+void AstNode::v3errorEndFatal(std::ostringstream& str) const VL_REQUIRES(V3Error::s().m_mutex) {
    v3errorEnd(str);
    assert(0);  // LCOV_EXCL_LINE
    VL_UNREACHABLE;
@@ -1216,9 +1319,9 @@ string AstNode::instanceStr() const {

    return "";
 }
-void AstNode::v3errorEnd(std::ostringstream& str) const {
+void AstNode::v3errorEnd(std::ostringstream& str) const VL_REQUIRES(V3Error::s().m_mutex) {
    if (!m_fileline) {
-        V3Error::v3errorEnd(str, instanceStr());
+        V3Error::s().v3errorEnd(str, instanceStr());
    } else {
        std::ostringstream nsstr;
        nsstr << str.str();
@@ -1231,8 +1334,8 @@ void AstNode::v3errorEnd(std::ostringstream& str) const {
        // Don't look for instance name when warning is disabled.
        // In case of large number of warnings, this can
        // take significant amount of time
-        m_fileline->v3errorEnd(nsstr,
-                               m_fileline->warnIsOff(V3Error::errorCode()) ? "" : instanceStr());
+        m_fileline->v3errorEnd(
+            nsstr, m_fileline->warnIsOff(V3Error::s().errorCode()) ? "" : instanceStr());
    }
 }

@@ -1255,7 +1358,9 @@ void AstNode::dtypeChgWidthSigned(int width, int widthMin, VSigning numeric) {
        dtypeSetLogicUnsized(width, widthMin, numeric);
    } else {
        if (width == dtypep()->width() && widthMin == dtypep()->widthMin()
-            && numeric == dtypep()->numeric())
+            && numeric == dtypep()->numeric()
+            // Enums need to become direct sizes to avoid later ENUMVALUE errors
+            && !VN_IS(dtypep()->skipRefToEnump(), EnumDType))
            return;  // Correct already
        // FUTURE: We may be pointing at a two state data type, and this may
        // convert it to logic.  Since the AstVar remains correct, we
@@ -1301,6 +1406,9 @@ AstNodeDType* AstNode::findQueueIndexDType() const {
 AstNodeDType* AstNode::findVoidDType() const {
    return v3Global.rootp()->typeTablep()->findVoidDType(fileline());
 }
+AstNodeDType* AstNode::findStreamDType() const {
+    return v3Global.rootp()->typeTablep()->findStreamDType(fileline());
+}

 //######################################################################
 // VNDeleter
@@ -82,6 +82,17 @@ using MTaskIdSet = std::set<int>;  // Set of mtaskIds for Var sorting
 // Ast<nodetypename>*' is returned.
 #define VN_AS(nodep, nodetypename) (AstNode::privateAs<Ast##nodetypename, decltype(nodep)>(nodep))

+// Same as VN_AS, but only checks the type in debug builds. Type checking is less critical in node
+// child getters (the strongly-typed functions that wrap op*p pointers). This is because the op*p
+// pointers are usually populated by code that already asserts the correct type. Having fewer type
+// assertions yields better performance in release builds.
+#ifdef VL_DEBUG
+#define VN_DBG_AS(nodep, nodetypename) VN_AS(nodep, nodetypename)
+#else
+#define VN_DBG_AS(nodep, nodetypename) \
+    (AstNode::unsafePrivateAs<Ast##nodetypename, decltype(nodep)>(nodep))
+#endif
+
 // (V)erilator (N)ode deleted: Pointer to deleted AstNode (for assertions only)
 #define VN_DELETED(nodep) VL_UNLIKELY((uint64_t)(nodep) == 0x1)

@@ -102,11 +113,11 @@ public:
        : m_e(static_cast<en>(_e)) {}  // Need () or GCC 4.8 false warning
    constexpr operator en() const VL_MT_SAFE { return m_e; }
 };
-constexpr bool operator==(const VNType& lhs, const VNType& rhs) VL_MT_SAFE {
+constexpr bool operator==(const VNType& lhs, const VNType& rhs) VL_PURE {
    return lhs.m_e == rhs.m_e;
 }
-constexpr bool operator==(const VNType& lhs, VNType::en rhs) { return lhs.m_e == rhs; }
-constexpr bool operator==(VNType::en lhs, const VNType& rhs) { return lhs == rhs.m_e; }
+constexpr bool operator==(const VNType& lhs, VNType::en rhs) VL_PURE { return lhs.m_e == rhs; }
+constexpr bool operator==(VNType::en lhs, const VNType& rhs) VL_PURE { return lhs == rhs.m_e; }
 inline std::ostream& operator<<(std::ostream& os, const VNType& rhs) { return os << rhs.ascii(); }

 // ######################################################################
@@ -371,7 +382,6 @@ public:
        //
        DT_PUBLIC,                      // V3LinkParse moves to AstTypedef::attrPublic
        //
-        ENUM_BASE,                      // V3LinkResolve creates for AstPreSel, V3LinkParam removes
        ENUM_FIRST,                     // V3Width processes
        ENUM_LAST,                      // V3Width processes
        ENUM_NUM,                       // V3Width processes
@@ -380,8 +390,7 @@ public:
        ENUM_NAME,                      // V3Width processes
        ENUM_VALID,                     // V3Width processes
        //
-        MEMBER_BASE,                    // V3LinkResolve creates for AstPreSel, V3LinkParam removes
-        //
+        TYPEID,                         // V3Width processes
        TYPENAME,                       // V3Width processes
        //
        VAR_BASE,                       // V3LinkResolve creates for AstPreSel, V3LinkParam removes
@@ -407,10 +416,9 @@ public:
            "DIM_BITS", "DIM_DIMENSIONS", "DIM_HIGH", "DIM_INCREMENT", "DIM_LEFT",
            "DIM_LOW", "DIM_RIGHT", "DIM_SIZE", "DIM_UNPK_DIMENSIONS",
            "DT_PUBLIC",
-            "ENUM_BASE", "ENUM_FIRST", "ENUM_LAST", "ENUM_NUM",
+            "ENUM_FIRST", "ENUM_LAST", "ENUM_NUM",
            "ENUM_NEXT", "ENUM_PREV", "ENUM_NAME", "ENUM_VALID",
-            "MEMBER_BASE",
-            "TYPENAME",
+            "TYPEID", "TYPENAME",
            "VAR_BASE", "VAR_CLOCK_ENABLE", "VAR_FORCEABLE", "VAR_PUBLIC",
            "VAR_PUBLIC_FLAT", "VAR_PUBLIC_FLAT_RD", "VAR_PUBLIC_FLAT_RW",
            "VAR_ISOLATE_ASSIGNMENTS", "VAR_SC_BV", "VAR_SFORMAT", "VAR_CLOCKER",
@@ -464,6 +472,7 @@ public:
        TRIGGER_SCHEDULER,
        DYNAMIC_TRIGGER_SCHEDULER,
        FORK_SYNC,
+        PROCESS_REFERENCE,
        // Unsigned and two state; fundamental types
        UINT32,
        UINT64,
@@ -473,7 +482,7 @@ public:
        _ENUM_MAX
    };
    enum en m_e;
-    const char* ascii() const {
+    const char* ascii() const VL_MT_SAFE {
        static const char* const names[] = {"%E-unk",
                                            "bit",
                                            "byte",
@@ -496,6 +505,7 @@ public:
                                            "VlTriggerScheduler",
                                            "VlDynamicTriggerScheduler",
                                            "VlFork",
+                                            "VlProcessRef",
                                            "IData",
                                            "QData",
                                            "LOGIC_IMPLICIT",
@@ -503,13 +513,20 @@ public:
        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*",   "%E-untyped",   "dpiScope",
-               "const char*",  "%E-mtaskstate", "%E-triggervec", "%E-dly-sched", "%E-trig-sched",
-               "%E-dyn-sched", "%E-fork",       "IData",         "QData",        "%E-logic-implct",
-               " MAX"};
+        static const char* const names[] = {"%E-unk",        "svBit",
+                                            "char",          "void*",
+                                            "char",          "int",
+                                            "%E-integer",    "svLogic",
+                                            "long long",     "double",
+                                            "short",         "%E-time",
+                                            "const char*",   "%E-untyped",
+                                            "dpiScope",      "const char*",
+                                            "%E-mtaskstate", "%E-triggervec",
+                                            "%E-dly-sched",  "%E-trig-sched",
+                                            "%E-dyn-sched",  "%E-fork",
+                                            "%E-proc-ref",   "IData",
+                                            "QData",         "%E-logic-implct",
+                                            " MAX"};
        return names[m_e];
    }
    static void selfTest() {
@@ -548,6 +565,7 @@ public:
        case TRIGGER_SCHEDULER: return 0;  // opaque
        case DYNAMIC_TRIGGER_SCHEDULER: return 0;  // opaque
        case FORK_SYNC: return 0;  // opaque
+        case PROCESS_REFERENCE: return 0;  // opaque
        case UINT32: return 32;
        case UINT64: return 64;
        default: return 0;
@@ -570,7 +588,8 @@ public:
    }
    bool isIntNumeric() const {  // Enum increment supported
        return (m_e == BIT || m_e == BYTE || m_e == INT || m_e == INTEGER || m_e == LOGIC
-                || m_e == LONGINT || m_e == SHORTINT || m_e == UINT32 || m_e == UINT64);
+                || m_e == LONGINT || m_e == SHORTINT || m_e == UINT32 || m_e == UINT64
+                || m_e == TIME);
    }
    bool isBitLogic() const {  // Bit/logic vector types; can form a packed array
        return (m_e == LOGIC || m_e == BIT);
@@ -586,7 +605,7 @@ public:
        return (m_e == EVENT || m_e == STRING || m_e == SCOPEPTR || m_e == CHARPTR
                || m_e == MTASKSTATE || m_e == TRIGGERVEC || m_e == DELAY_SCHEDULER
                || m_e == TRIGGER_SCHEDULER || m_e == DYNAMIC_TRIGGER_SCHEDULER || m_e == FORK_SYNC
-                || m_e == DOUBLE || m_e == UNTYPED);
+                || m_e == PROCESS_REFERENCE || m_e == DOUBLE || m_e == UNTYPED);
    }
    bool isDouble() const VL_MT_SAFE { return m_e == DOUBLE; }
    bool isEvent() const { return m_e == EVENT; }
@@ -805,6 +824,10 @@ public:
    bool isTemp() const {
        return (m_e == BLOCKTEMP || m_e == MODULETEMP || m_e == STMTTEMP || m_e == XTEMP);
    }
+    bool isVPIAccessible() const {
+        return (m_e == VAR || m_e == GPARAM || m_e == LPARAM || m_e == PORT || m_e == WIRE
+                || m_e == TRI0 || m_e == TRI1);
+    }
 };
 constexpr bool operator==(const VVarType& lhs, const VVarType& rhs) VL_MT_SAFE {
    return lhs.m_e == rhs.m_e;
@@ -1095,21 +1118,21 @@ public:
    }
    //
    VNumRange() = default;
-    VNumRange(int hi, int lo, bool littleEndian) { init(hi, lo, littleEndian); }
+    VNumRange(int hi, int lo, bool ascending) { init(hi, lo, ascending); }
    VNumRange(int left, int right)
        : m_left{left}
        , m_right{right}
        , m_ranged{true} {}
    ~VNumRange() = default;
    // MEMBERS
-    void init(int hi, int lo, bool littleEndian) {
+    void init(int hi, int lo, bool ascending) {
        if (lo > hi) {
            const int t = hi;
            hi = lo;
            lo = t;
        }
-        m_left = littleEndian ? lo : hi;
-        m_right = littleEndian ? hi : lo;
+        m_left = ascending ? lo : hi;
+        m_right = ascending ? hi : lo;
        m_ranged = true;
    }
    int left() const { return m_left; }
@@ -1120,10 +1143,10 @@ public:
    int lo() const VL_MT_SAFE {
        return m_left > m_right ? m_right : m_left;
    }  // How to show a declaration
-    int leftToRightInc() const { return littleEndian() ? 1 : -1; }
+    int leftToRightInc() const { return ascending() ? 1 : -1; }
    int elements() const VL_MT_SAFE { return hi() - lo() + 1; }
    bool ranged() const { return m_ranged; }
-    bool littleEndian() const { return m_left < m_right; }
+    bool ascending() const { return m_left < m_right; }
    int hiMaxSelect() const {
        return (lo() < 0 ? hi() - lo() : hi());
    }  // Maximum value a [] select may index
@@ -1371,13 +1394,38 @@ public:
    virtual ~VNDeleter() { doDeletes(); }
 };

+//######################################################################
+// VNVisitorConst -- Allows new functions to be called on each node
+// type without changing the base classes.  See "Modern C++ Design".
+// This only has the constant fuctions for non-modifying visitors.
+// For more typical usage see VNVisitor
+
+class VNVisitorConst VL_NOT_FINAL : public VNDeleter {
+    friend class AstNode;
+
+public:
+    /// Call visit()s on nodep
+    inline void iterateConst(AstNode* nodep);
+    /// Call visit()s on nodep
+    inline void iterateConstNull(AstNode* nodep);
+    /// Call visit()s on const nodep's children
+    inline void iterateChildrenConst(AstNode* nodep);
+    /// Call visit()s on nodep's children in backp() order
+    inline void iterateChildrenBackwardsConst(AstNode* nodep);
+    /// Call visit()s on const nodep (maybe nullptr) and nodep's nextp() list
+    inline void iterateAndNextConstNull(AstNode* nodep);
+    /// Call visit()s on const nodep (maybe nullptr) and nodep's nextp() list, in reverse order
+    inline void iterateAndNextConstNullBackwards(AstNode* nodep);
+
+    virtual void visit(AstNode* nodep) = 0;
+#include "V3Ast__gen_visitor_decls.h"  // From ./astgen
+};
+
 //######################################################################
 // VNVisitor -- Allows new functions to be called on each node
 // type without changing the base classes.  See "Modern C++ Design".

-class VNVisitor VL_NOT_FINAL : public VNDeleter {
-    friend class AstNode;
-
+class VNVisitor VL_NOT_FINAL : public VNVisitorConst {
 public:
    /// Call visit()s on nodep
    inline void iterate(AstNode* nodep);
@@ -1385,21 +1433,10 @@ public:
    inline void iterateNull(AstNode* nodep);
    /// Call visit()s on nodep's children
    inline void iterateChildren(AstNode* nodep);
-    /// Call visit()s on nodep's children in backp() order
-    inline void iterateChildrenBackwards(AstNode* nodep);
-    /// Call visit()s on const nodep's children
-    inline void iterateChildrenConst(AstNode* nodep);
    /// Call visit()s on nodep (maybe nullptr) and nodep's nextp() list
    inline void iterateAndNextNull(AstNode* nodep);
-    /// Call visit()s on const nodep (maybe nullptr) and nodep's nextp() list
-    inline void iterateAndNextConstNull(AstNode* nodep);
-    /// Call visit()s on const nodep (maybe nullptr) and nodep's nextp() list, in reverse order
-    inline void iterateAndNextConstNullBackwards(AstNode* nodep);
    /// Return edited nodep; see comments in V3Ast.cpp
    inline AstNode* iterateSubtreeReturnEdits(AstNode* nodep);
-
-    virtual void visit(AstNode* nodep) = 0;
-#include "V3Ast__gen_visitor_decls.h"  // From ./astgen
 };

 //######################################################################
@@ -1424,6 +1461,13 @@ protected:

 public:
    VNRelinker() = default;
+    ~VNRelinker() {
+        // Relink is needed so m_iterpp's get restored, e.g. can't have:
+        // ->unlinkFrBack(relinker);
+        // if (only_sometimes) relinker.relink(newp);
+        UDEBUGONLY(
+            UASSERT_STATIC(!m_backp, "Active linker must be relink()ed before destruction"););
+    }
    inline void relink(AstNode* newp);
    AstNode* oldp() const { return m_oldp; }
    void dump(std::ostream& str = std::cout) const;
@@ -1543,7 +1587,7 @@ class AstNode VL_NOT_FINAL {
 private:
    AstNode* cloneTreeIter();
    AstNode* cloneTreeIterList();
-    void checkTreeIter(const AstNode* prevBackp) const VL_MT_SAFE;
+    void checkTreeIter(const AstNode* prevBackp) const VL_MT_STABLE;
    bool gateTreeIter() const;
    static bool sameTreeIter(const AstNode* node1p, const AstNode* node2p, bool ignNext,
                             bool gateOnly);
@@ -1599,14 +1643,14 @@ public:
    // ACCESSORS
    VNType type() const VL_MT_SAFE { return m_type; }
    const char* typeName() const VL_MT_SAFE { return type().ascii(); }  // See also prettyTypeName
-    AstNode* nextp() const VL_MT_SAFE { return m_nextp; }
-    AstNode* backp() const VL_MT_SAFE { return m_backp; }
+    AstNode* nextp() const VL_MT_STABLE { return m_nextp; }
+    AstNode* backp() const VL_MT_STABLE { return m_backp; }
    AstNode* abovep() const;  // Parent node above, only when no nextp() as otherwise slow
-    AstNode* op1p() const VL_MT_SAFE { return m_op1p; }
-    AstNode* op2p() const VL_MT_SAFE { return m_op2p; }
-    AstNode* op3p() const VL_MT_SAFE { return m_op3p; }
-    AstNode* op4p() const VL_MT_SAFE { return m_op4p; }
-    AstNodeDType* dtypep() const VL_MT_SAFE { return m_dtypep; }
+    AstNode* op1p() const VL_MT_STABLE { return m_op1p; }
+    AstNode* op2p() const VL_MT_STABLE { return m_op2p; }
+    AstNode* op3p() const VL_MT_STABLE { return m_op3p; }
+    AstNode* op4p() const VL_MT_STABLE { return m_op4p; }
+    AstNodeDType* dtypep() const VL_MT_STABLE { return m_dtypep; }
    AstNode* clonep() const { return ((m_cloneCnt == s_cloneCntGbl) ? m_clonep : nullptr); }
    AstNode* firstAbovep() const {  // Returns nullptr when second or later in list
        return ((backp() && backp()->nextp() != this) ? backp() : nullptr);
@@ -1653,7 +1697,7 @@ public:
    static constexpr int INSTR_COUNT_PLI = 20;  // PLI routines

    // ACCESSORS
-    virtual string name() const VL_MT_SAFE { return ""; }
+    virtual string name() const { return ""; }
    virtual string origName() const { return ""; }
    virtual void name(const string& name) {
        this->v3fatalSrc("name() called on object without name() method");
@@ -1661,21 +1705,23 @@ public:
    virtual void tag(const string& text) {}
    virtual string tag() const { return ""; }
    virtual string verilogKwd() const { return ""; }
-    string nameProtect() const VL_MT_SAFE;  // Name with --protect-id applied
+    string nameProtect() const;  // Name with --protect-id applied
    string origNameProtect() const;  // origName with --protect-id applied
    string shortName() const;  // Name with __PVT__ removed for concatenating scopes
    static string dedotName(const string& namein);  // Name with dots removed
-    static string prettyName(const string& namein);  // Name for printing out to the user
+    static string prettyName(const string& namein) VL_PURE;  // Name for printing out to the user
+    static string vpiName(const string& namein);  // Name for vpi access
    static string prettyNameQ(const string& namein) {  // Quoted pretty name (for errors)
        return std::string{"'"} + prettyName(namein) + "'";
    }
-    static string
-    encodeName(const string& namein);  // Encode user name into internal C representation
+    // Encode user name into internal C representation
+    static string encodeName(const string& namein);
    static string encodeNumber(int64_t num);  // Encode number into internal C representation
    static string vcdName(const string& namein);  // Name for printing out to vcd files
-    string prettyName() const VL_MT_SAFE { return prettyName(name()); }
+    string prettyName() const { return prettyName(name()); }
    string prettyNameQ() const { return prettyNameQ(name()); }
-    string prettyTypeName() const;  // "VARREF" for error messages (NOT dtype's pretty name)
+    // "VARREF" for error messages (NOT dtype's pretty name)
+    string prettyTypeName() const;
    virtual string prettyOperatorName() const { return "operator " + prettyTypeName(); }
    FileLine* fileline() const VL_MT_SAFE { return m_fileline; }
    void fileline(FileLine* fl) { m_fileline = fl; }
@@ -1694,25 +1740,25 @@ public:
    void protect(bool flag) { m_flags.protect = flag; }

    // TODO stomp these width functions out, and call via dtypep() instead
-    inline int width() const VL_MT_SAFE;
+    inline int width() const VL_MT_STABLE;
    inline int widthMin() const;
    int widthMinV() const {
        return v3Global.widthMinUsage() == VWidthMinUsage::VERILOG_WIDTH ? widthMin() : width();
    }
    int widthWords() const { return VL_WORDS_I(width()); }
-    bool isQuad() const VL_MT_SAFE { return (width() > VL_IDATASIZE && width() <= VL_QUADSIZE); }
-    bool isWide() const VL_MT_SAFE { return (width() > VL_QUADSIZE); }
-    inline bool isDouble() const;
-    inline bool isSigned() const;
-    inline bool isString() const;
+    bool isQuad() const VL_MT_STABLE { return (width() > VL_IDATASIZE && width() <= VL_QUADSIZE); }
+    bool isWide() const VL_MT_STABLE { return (width() > VL_QUADSIZE); }
+    inline bool isDouble() const VL_MT_STABLE;
+    inline bool isSigned() const VL_MT_STABLE;
+    inline bool isString() const VL_MT_STABLE;

    // clang-format off
-    VNUser      user1u() const VL_MT_SAFE {
+    VNUser      user1u() const VL_MT_STABLE {
        // Slows things down measurably, so disabled by default
        //UASSERT_STATIC(VNUser1InUse::s_userBusy, "userp set w/o busy");
        return ((m_user1Cnt==VNUser1InUse::s_userCntGbl) ? m_user1u : VNUser{0});
    }
-    AstNode*    user1p() const VL_MT_SAFE { return user1u().toNodep(); }
+    AstNode*    user1p() const VL_MT_STABLE { return user1u().toNodep(); }
    void        user1u(const VNUser& user) { m_user1u=user; m_user1Cnt=VNUser1InUse::s_userCntGbl; }
    void        user1p(void* userp) { user1u(VNUser{userp}); }
    int         user1() const { return user1u().toInt(); }
@@ -1721,12 +1767,12 @@ public:
    int         user1SetOnce() { int v=user1(); if (!v) user1(1); return v; }  // Better for cache than user1Inc()
    static void user1ClearTree() { VNUser1InUse::clear(); }  // Clear userp()'s across the entire tree

-    VNUser      user2u() const VL_MT_SAFE {
+    VNUser      user2u() const VL_MT_STABLE {
        // Slows things down measurably, so disabled by default
        //UASSERT_STATIC(VNUser2InUse::s_userBusy, "userp set w/o busy");
        return ((m_user2Cnt==VNUser2InUse::s_userCntGbl) ? m_user2u : VNUser{0});
    }
-    AstNode*    user2p() const VL_MT_SAFE { return user2u().toNodep(); }
+    AstNode*    user2p() const VL_MT_STABLE { return user2u().toNodep(); }
    void        user2u(const VNUser& user) { m_user2u=user; m_user2Cnt=VNUser2InUse::s_userCntGbl; }
    void        user2p(void* userp) { user2u(VNUser{userp}); }
    int         user2() const { return user2u().toInt(); }
@@ -1735,12 +1781,12 @@ public:
    int         user2SetOnce() { int v=user2(); if (!v) user2(1); return v; }  // Better for cache than user2Inc()
    static void user2ClearTree() { VNUser2InUse::clear(); }  // Clear userp()'s across the entire tree

-    VNUser      user3u() const VL_MT_SAFE {
+    VNUser      user3u() const VL_MT_STABLE {
        // Slows things down measurably, so disabled by default
        //UASSERT_STATIC(VNUser3InUse::s_userBusy, "userp set w/o busy");
        return ((m_user3Cnt==VNUser3InUse::s_userCntGbl) ? m_user3u : VNUser{0});
    }
-    AstNode*    user3p() const VL_MT_SAFE { return user3u().toNodep(); }
+    AstNode*    user3p() const VL_MT_STABLE { return user3u().toNodep(); }
    void        user3u(const VNUser& user) { m_user3u=user; m_user3Cnt=VNUser3InUse::s_userCntGbl; }
    void        user3p(void* userp) { user3u(VNUser{userp}); }
    int         user3() const { return user3u().toInt(); }
@@ -1749,12 +1795,12 @@ public:
    int         user3SetOnce() { int v=user3(); if (!v) user3(1); return v; }  // Better for cache than user3Inc()
    static void user3ClearTree() { VNUser3InUse::clear(); }  // Clear userp()'s across the entire tree

-    VNUser      user4u() const VL_MT_SAFE {
+    VNUser      user4u() const VL_MT_STABLE {
        // Slows things down measurably, so disabled by default
        //UASSERT_STATIC(VNUser4InUse::s_userBusy, "userp set w/o busy");
        return ((m_user4Cnt==VNUser4InUse::s_userCntGbl) ? m_user4u : VNUser{0});
    }
-    AstNode*    user4p() const VL_MT_SAFE { return user4u().toNodep(); }
+    AstNode*    user4p() const VL_MT_STABLE { return user4u().toNodep(); }
    void        user4u(const VNUser& user) { m_user4u=user; m_user4Cnt=VNUser4InUse::s_userCntGbl; }
    void        user4p(void* userp) { user4u(VNUser{userp}); }
    int         user4() const { return user4u().toInt(); }
@@ -1763,12 +1809,12 @@ public:
    int         user4SetOnce() { int v=user4(); if (!v) user4(1); return v; }  // Better for cache than user4Inc()
    static void user4ClearTree() { VNUser4InUse::clear(); }  // Clear userp()'s across the entire tree

-    VNUser      user5u() const VL_MT_SAFE {
+    VNUser      user5u() const VL_MT_STABLE {
        // Slows things down measurably, so disabled by default
        //UASSERT_STATIC(VNUser5InUse::s_userBusy, "userp set w/o busy");
        return ((m_user5Cnt==VNUser5InUse::s_userCntGbl) ? m_user5u : VNUser{0});
    }
-    AstNode*    user5p() const VL_MT_SAFE { return user5u().toNodep(); }
+    AstNode*    user5p() const VL_MT_STABLE { return user5u().toNodep(); }
    void        user5u(const VNUser& user) { m_user5u=user; m_user5Cnt=VNUser5InUse::s_userCntGbl; }
    void        user5p(void* userp) { user5u(VNUser{userp}); }
    int         user5() const { return user5u().toInt(); }
@@ -1792,6 +1838,7 @@ public:

    // ACCESSORS for specific types
    // Alas these can't be virtual or they break when passed a nullptr
+    inline bool isClassHandleValue() const;
    inline bool isZero() const;
    inline bool isOne() const;
    inline bool isNeqZero() const;
@@ -1831,6 +1878,7 @@ public:
    void dtypeSetUInt64() { dtypep(findUInt64DType()); }  // Twostate
    void dtypeSetEmptyQueue() { dtypep(findEmptyQueueDType()); }
    void dtypeSetVoid() { dtypep(findVoidDType()); }
+    void dtypeSetStream() { dtypep(findStreamDType()); }

    // Data type locators
    AstNodeDType* findBitDType() const { return findBasicDType(VBasicDTypeKwd::LOGIC); }
@@ -1842,6 +1890,7 @@ public:
    AstNodeDType* findCHandleDType() const { return findBasicDType(VBasicDTypeKwd::CHANDLE); }
    AstNodeDType* findEmptyQueueDType() const;
    AstNodeDType* findVoidDType() const;
+    AstNodeDType* findStreamDType() const;
    AstNodeDType* findQueueIndexDType() const;
    AstNodeDType* findBitDType(int width, int widthMin, VSigning numeric) const;
    AstNodeDType* findLogicDType(int width, int widthMin, VSigning numeric) const;
@@ -1852,12 +1901,15 @@ public:
    static AstBasicDType* findInsertSameDType(AstBasicDType* nodep);

    // METHODS - dump and error
-    void v3errorEnd(std::ostringstream& str) const VL_MT_SAFE;
-    void v3errorEndFatal(std::ostringstream& str) const VL_ATTR_NORETURN VL_MT_SAFE;
-    string warnContextPrimary() const { return fileline()->warnContextPrimary(); }
+    void v3errorEnd(std::ostringstream& str) const VL_REQUIRES(V3Error::s().m_mutex);
+    void v3errorEndFatal(std::ostringstream& str) const VL_ATTR_NORETURN
+        VL_REQUIRES(V3Error::s().m_mutex);
+    string warnContextPrimary() const VL_REQUIRES(V3Error::s().m_mutex) {
+        return fileline()->warnContextPrimary();
+    }
    string warnContextSecondary() const { return fileline()->warnContextSecondary(); }
-    string warnMore() const { return fileline()->warnMore(); }
-    string warnOther() const { return fileline()->warnOther(); }
+    string warnMore() const VL_REQUIRES(V3Error::s().m_mutex) { return fileline()->warnMore(); }
+    string warnOther() const VL_REQUIRES(V3Error::s().m_mutex) { return fileline()->warnOther(); }

    virtual void dump(std::ostream& str = std::cout) const;
    static void dumpGdb(const AstNode* nodep);  // For GDB only
@@ -1887,8 +1939,6 @@ public:
    // Iterate and insert - assumes tree format
    virtual void addNextStmt(AstNode* newp,
                             AstNode* belowp);  // When calling, "this" is second argument
-    virtual void addBeforeStmt(AstNode* newp,
-                               AstNode* belowp);  // When calling, "this" is second argument

    // METHODS - Iterate on a tree
    // Clone or return nullptr if nullptr
@@ -1901,7 +1951,7 @@ public:
    // Does tree of this == node2p?, not allowing non-isGateOptimizable
    inline bool sameGateTree(const AstNode* node2p) const;
    void deleteTree();  // Always deletes the next link
-    void checkTree() const VL_MT_SAFE {
+    void checkTree() const VL_MT_STABLE {
        if (v3Global.opt.debugCheck()) checkTreeIter(backp());
    }
    void checkIter() const;
@@ -1920,6 +1970,8 @@ public:
    void dumpTreeDot(std::ostream& os = std::cout) const;
    void dumpTreeDotFile(const string& filename, bool append = false, bool doDump = true);

+    bool isTreePureRecurse() const;
+
    // METHODS - queries
    // Changes control flow, disable some optimizations
    virtual bool isBrancher() const { return false; }
@@ -1956,26 +2008,27 @@ public:
    virtual const char* broken() const { return nullptr; }

    // INVOKERS
-    virtual void accept(VNVisitor& v) = 0;
+    virtual void accept(VNVisitorConst& v) = 0;

 protected:
    // All VNVisitor related functions are called as methods off the visitor
    friend class VNVisitor;
+    friend class VNVisitorConst;
    // Use instead VNVisitor::iterateChildren
    void iterateChildren(VNVisitor& v);
-    // Use instead VNVisitor::iterateChildrenBackwards
-    void iterateChildrenBackwards(VNVisitor& v);
+    // Use instead VNVisitor::iterateChildrenBackwardsConst
+    void iterateChildrenBackwardsConst(VNVisitorConst& v);
    // Use instead VNVisitor::iterateChildrenConst
-    void iterateChildrenConst(VNVisitor& v);
+    void iterateChildrenConst(VNVisitorConst& v);
    // Use instead VNVisitor::iterateAndNextNull
    void iterateAndNext(VNVisitor& v);
    // Use instead VNVisitor::iterateAndNextConstNull
-    void iterateAndNextConst(VNVisitor& v);
+    void iterateAndNextConst(VNVisitorConst& v);
    // Use instead VNVisitor::iterateSubtreeReturnEdits
    AstNode* iterateSubtreeReturnEdits(VNVisitor& v);

 private:
-    void iterateListBackwards(VNVisitor& v);
+    void iterateListBackwardsConst(VNVisitorConst& v);

    // For internal use only.
    // Note: specializations for particular node types are provided by 'astgen'
@@ -1984,7 +2037,7 @@ private:

    // For internal use only.
    template <typename TargetType, typename DeclType>
-    constexpr static bool uselessCast() {
+    constexpr static bool uselessCast() VL_PURE {
        using NonRef = typename std::remove_reference<DeclType>::type;
        using NonPtr = typename std::remove_pointer<NonRef>::type;
        using NonCV = typename std::remove_cv<NonPtr>::type;
@@ -1993,7 +2046,7 @@ private:

    // For internal use only.
    template <typename TargetType, typename DeclType>
-    constexpr static bool impossibleCast() {
+    constexpr static bool impossibleCast() VL_PURE {
        using NonRef = typename std::remove_reference<DeclType>::type;
        using NonPtr = typename std::remove_pointer<NonRef>::type;
        using NonCV = typename std::remove_cv<NonPtr>::type;
@@ -2025,24 +2078,34 @@ public:
        return nodep && privateTypeTest<T>(nodep) ? reinterpret_cast<const T*>(nodep) : nullptr;
    }

-    // For use via the VN_AS macro only
+    // For use via privateAs or the VN_DBG_AS macro only
    template <typename T, typename E>
-    static T* privateAs(AstNode* nodep) VL_MT_SAFE {
+    static T* unsafePrivateAs(AstNode* nodep) VL_PURE {
        static_assert(!uselessCast<T, E>(), "Unnecessary VN_AS, node known to have target type.");
        static_assert(!impossibleCast<T, E>(), "Unnecessary VN_AS, node cannot be this type.");
-        UASSERT_OBJ(!nodep || privateTypeTest<T>(nodep), nodep,
-                    "AstNode is not of expected type, but instead has type '" << nodep->typeName()
-                                                                              << "'");
        return reinterpret_cast<T*>(nodep);
    }
    template <typename T, typename E>
-    static const T* privateAs(const AstNode* nodep) VL_MT_SAFE {
+    static const T* unsafePrivateAs(const AstNode* nodep) VL_PURE {
        static_assert(!uselessCast<T, E>(), "Unnecessary VN_AS, node known to have target type.");
        static_assert(!impossibleCast<T, E>(), "Unnecessary VN_AS, node cannot be this type.");
+        return reinterpret_cast<const T*>(nodep);
+    }
+
+    // For use via the VN_AS macro only
+    template <typename T, typename E>
+    static T* privateAs(AstNode* nodep) VL_PURE {
        UASSERT_OBJ(!nodep || privateTypeTest<T>(nodep), nodep,
                    "AstNode is not of expected type, but instead has type '" << nodep->typeName()
                                                                              << "'");
-        return reinterpret_cast<const T*>(nodep);
+        return unsafePrivateAs<T, E>(nodep);
+    }
+    template <typename T, typename E>
+    static const T* privateAs(const AstNode* nodep) VL_PURE {
+        UASSERT_OBJ(!nodep || privateTypeTest<T>(nodep), nodep,
+                    "AstNode is not of expected type, but instead has type '" << nodep->typeName()
+                                                                              << "'");
+        return unsafePrivateAs<T, E>(nodep);
    }

    // Predicate that returns true if the given 'nodep' might have a descendant of type 'T_Node'.
@@ -2475,24 +2538,29 @@ struct std::equal_to<VNRef<T_Node>> final {
 //######################################################################
 // Inline VNVisitor METHODS

+void VNVisitorConst::iterateConst(AstNode* nodep) { nodep->accept(*this); }
+void VNVisitorConst::iterateConstNull(AstNode* nodep) {
+    if (VL_LIKELY(nodep)) nodep->accept(*this);
+}
+void VNVisitorConst::iterateChildrenConst(AstNode* nodep) { nodep->iterateChildrenConst(*this); }
+void VNVisitorConst::iterateChildrenBackwardsConst(AstNode* nodep) {
+    nodep->iterateChildrenBackwardsConst(*this);
+}
+void VNVisitorConst::iterateAndNextConstNullBackwards(AstNode* nodep) {
+    if (VL_LIKELY(nodep)) nodep->iterateListBackwardsConst(*this);
+}
+void VNVisitorConst::iterateAndNextConstNull(AstNode* nodep) {
+    if (VL_LIKELY(nodep)) nodep->iterateAndNextConst(*this);
+}
+
 void VNVisitor::iterate(AstNode* nodep) { nodep->accept(*this); }
 void VNVisitor::iterateNull(AstNode* nodep) {
    if (VL_LIKELY(nodep)) nodep->accept(*this);
 }
 void VNVisitor::iterateChildren(AstNode* nodep) { nodep->iterateChildren(*this); }
-void VNVisitor::iterateChildrenBackwards(AstNode* nodep) {
-    nodep->iterateChildrenBackwards(*this);
-}
-void VNVisitor::iterateChildrenConst(AstNode* nodep) { nodep->iterateChildrenConst(*this); }
 void VNVisitor::iterateAndNextNull(AstNode* nodep) {
    if (VL_LIKELY(nodep)) nodep->iterateAndNext(*this);
 }
-void VNVisitor::iterateAndNextConstNullBackwards(AstNode* nodep) {
-    if (VL_LIKELY(nodep)) nodep->iterateListBackwards(*this);
-}
-void VNVisitor::iterateAndNextConstNull(AstNode* nodep) {
-    if (VL_LIKELY(nodep)) nodep->iterateAndNextConst(*this);
-}
 AstNode* VNVisitor::iterateSubtreeReturnEdits(AstNode* nodep) {
    return nodep->iterateSubtreeReturnEdits(*this);
 }
@@ -25,7 +25,7 @@
 //######################################################################
 // Inline METHODS

-int AstNode::width() const { return dtypep() ? dtypep()->width() : 0; }
+int AstNode::width() const VL_MT_STABLE { return dtypep() ? dtypep()->width() : 0; }
 int AstNode::widthMin() const { return dtypep() ? dtypep()->widthMin() : 0; }
 bool AstNode::width1() const {  // V3Const uses to know it can optimize
    return dtypep() && dtypep()->width() == 1;
@@ -33,14 +33,18 @@ bool AstNode::width1() const {  // V3Const uses to know it can optimize
 int AstNode::widthInstrs() const {
    return (!dtypep() ? 1 : (dtypep()->isWide() ? dtypep()->widthWords() : 1));
 }
-bool AstNode::isDouble() const VL_MT_SAFE {
+bool AstNode::isDouble() const VL_MT_STABLE {
    return dtypep() && VN_IS(dtypep(), BasicDType) && VN_AS(dtypep(), BasicDType)->isDouble();
 }
-bool AstNode::isString() const VL_MT_SAFE {
+bool AstNode::isString() const VL_MT_STABLE {
    return dtypep() && dtypep()->basicp() && dtypep()->basicp()->isString();
 }
-bool AstNode::isSigned() const { return dtypep() && dtypep()->isSigned(); }
+bool AstNode::isSigned() const VL_MT_STABLE { return dtypep() && dtypep()->isSigned(); }

+bool AstNode::isClassHandleValue() const {
+    return (VN_IS(this, Const) && VN_AS(this, Const)->num().isNull())
+           || VN_IS(dtypep(), ClassRefDType);
+}
 bool AstNode::isZero() const {
    return (VN_IS(this, Const) && VN_AS(this, Const)->num().isEqZero());
 }
@@ -61,12 +65,12 @@ bool AstNode::sameGateTree(const AstNode* node2p) const {
    return sameTreeIter(this, node2p, true, true);
 }

-int AstNodeArrayDType::left() const VL_MT_SAFE { return rangep()->leftConst(); }
-int AstNodeArrayDType::right() const VL_MT_SAFE { return rangep()->rightConst(); }
-int AstNodeArrayDType::hi() const VL_MT_SAFE { return rangep()->hiConst(); }
-int AstNodeArrayDType::lo() const VL_MT_SAFE { return rangep()->loConst(); }
-int AstNodeArrayDType::elementsConst() const VL_MT_SAFE { return rangep()->elementsConst(); }
-VNumRange AstNodeArrayDType::declRange() const VL_MT_SAFE { return VNumRange{left(), right()}; }
+int AstNodeArrayDType::left() const VL_MT_STABLE { return rangep()->leftConst(); }
+int AstNodeArrayDType::right() const VL_MT_STABLE { return rangep()->rightConst(); }
+int AstNodeArrayDType::hi() const VL_MT_STABLE { return rangep()->hiConst(); }
+int AstNodeArrayDType::lo() const VL_MT_STABLE { return rangep()->loConst(); }
+int AstNodeArrayDType::elementsConst() const VL_MT_STABLE { return rangep()->elementsConst(); }
+VNumRange AstNodeArrayDType::declRange() const VL_MT_STABLE { return VNumRange{left(), right()}; }

 AstRange::AstRange(FileLine* fl, int left, int right)
    : ASTGEN_SUPER_Range(fl) {
@@ -78,16 +82,16 @@ AstRange::AstRange(FileLine* fl, const VNumRange& range)
    leftp(new AstConst{fl, static_cast<uint32_t>(range.left())});
    rightp(new AstConst{fl, static_cast<uint32_t>(range.right())});
 }
-int AstRange::leftConst() const {
+int AstRange::leftConst() const VL_MT_STABLE {
    AstConst* const constp = VN_CAST(leftp(), Const);
    return (constp ? constp->toSInt() : 0);
 }
-int AstRange::rightConst() const {
+int AstRange::rightConst() const VL_MT_STABLE {
    AstConst* const constp = VN_CAST(rightp(), Const);
    return (constp ? constp->toSInt() : 0);
 }

-int AstQueueDType::boundConst() const VL_MT_SAFE {
+int AstQueueDType::boundConst() const VL_MT_STABLE {
    AstConst* const constp = VN_CAST(boundp(), Const);
    return (constp ? constp->toSInt() : 0);
 }
@@ -123,8 +127,8 @@ int AstBasicDType::lo() const { return (rangep() ? rangep()->loConst() : m.m_nra
 int AstBasicDType::elements() const {
    return (rangep() ? rangep()->elementsConst() : m.m_nrange.elements());
 }
-bool AstBasicDType::littleEndian() const {
-    return (rangep() ? rangep()->littleEndian() : m.m_nrange.littleEndian());
+bool AstBasicDType::ascending() const {
+    return (rangep() ? rangep()->ascending() : m.m_nrange.ascending());
 }

 bool AstActive::hasClocked() const { return m_sensesp->hasClocked(); }
@@ -150,12 +154,15 @@ AstCExpr::AstCExpr(FileLine* fl, const string& textStmt, int setwidth, bool clea
 }

 AstVarRef::AstVarRef(FileLine* fl, AstVar* varp, const VAccess& access)
-    : ASTGEN_SUPER_VarRef(fl, varp->name(), varp, access) {}
+    : ASTGEN_SUPER_VarRef(fl, varp, access) {}
 // This form only allowed post-link (see above)
 AstVarRef::AstVarRef(FileLine* fl, AstVarScope* varscp, const VAccess& access)
-    : ASTGEN_SUPER_VarRef(fl, varscp->varp()->name(), varscp->varp(), access) {
+    : ASTGEN_SUPER_VarRef(fl, varscp->varp(), access) {
    varScopep(varscp);
 }
+
+string AstVarRef::name() const { return varp() ? varp()->name() : "<null>"; }
+
 bool AstVarRef::same(const AstVarRef* samep) const {
    if (varScopep()) {
        return (varScopep() == samep->varScopep() && access() == samep->access());
@@ -175,7 +182,8 @@ bool AstVarRef::sameNoLvalue(AstVarRef* samep) const {
 }

 AstVarXRef::AstVarXRef(FileLine* fl, AstVar* varp, const string& dotted, const VAccess& access)
-    : ASTGEN_SUPER_VarXRef(fl, varp->name(), varp, access)
+    : ASTGEN_SUPER_VarXRef(fl, varp, access)
+    , m_name{varp->name()}
    , m_dotted{dotted} {
    dtypeFrom(varp);
 }
@@ -60,10 +60,12 @@ public:
    /// are compound when methods calls operate on object, or when
    /// under another compound-requiring object e.g. class
    virtual bool isCompound() const = 0;
+    // Integral or packed, allowed inside an unpacked union/struct
+    virtual bool isIntegralOrPacked() const { return !isCompound(); }
    // (Slow) recurse down to find basic data type
-    virtual AstBasicDType* basicp() const = 0;
+    virtual AstBasicDType* basicp() const VL_MT_STABLE = 0;
    // recurses over typedefs/const/enum to next non-typeref type
-    virtual AstNodeDType* skipRefp() const = 0;
+    virtual AstNodeDType* skipRefp() const VL_MT_STABLE = 0;
    // recurses over typedefs to next non-typeref-or-const type
    virtual AstNodeDType* skipRefToConstp() const = 0;
    // recurses over typedefs/const to next non-typeref-or-enum/struct type
@@ -84,7 +86,7 @@ public:
    // Assignable equivalence.  Call skipRefp() on this and samep before calling
    virtual bool similarDType(const AstNodeDType* samep) const = 0;
    // Iff has a non-null subDTypep(), as generic node function
-    virtual AstNodeDType* subDTypep() const { return nullptr; }
+    virtual AstNodeDType* subDTypep() const VL_MT_SAFE { return nullptr; }
    virtual bool isFourstate() const;
    // Ideally an IEEE $typename
    virtual string prettyDTypeName() const { return prettyTypeName(); }
@@ -124,12 +126,13 @@ public:
    const char* charIQWN() const {
        return (isString() ? "N" : isWide() ? "W" : isQuad() ? "Q" : "I");
    }
-    string cType(const string& name, bool forFunc, bool isRef) const VL_MT_SAFE;
-    bool isLiteralType() const VL_MT_SAFE;  // Represents a C++ LiteralType? (can be constexpr)
+    string cType(const string& name, bool forFunc, bool isRef) const;
+    // Represents a C++ LiteralType? (can be constexpr)
+    bool isLiteralType() const VL_MT_STABLE;

 private:
    class CTypeRecursed;
-    CTypeRecursed cTypeRecurse(bool compound) const VL_MT_SAFE;
+    CTypeRecursed cTypeRecurse(bool compound) const;
 };
 class AstNodeArrayDType VL_NOT_FINAL : public AstNodeDType {
    // Array data type, ie "some_dtype var_name [2:0]"
@@ -168,39 +171,37 @@ public:
                && subDTypep()->skipRefp()->similarDType(asamep->subDTypep()->skipRefp()));
    }
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const override VL_MT_SAFE {
+    AstNodeDType* subDTypep() const override VL_MT_STABLE {
        return m_refDTypep ? m_refDTypep : childDTypep();
    }
    void refDTypep(AstNodeDType* nodep) { m_refDTypep = nodep; }
    AstNodeDType* virtRefDTypep() const override { return m_refDTypep; }
    void virtRefDTypep(AstNodeDType* nodep) override { refDTypep(nodep); }
    // METHODS
-    AstBasicDType* basicp() const override VL_MT_SAFE {
+    AstBasicDType* basicp() const override VL_MT_STABLE {
        return subDTypep()->basicp();
    }  // (Slow) recurse down to find basic data type
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
    int widthAlignBytes() const override { return subDTypep()->widthAlignBytes(); }
    int widthTotalBytes() const override {
        return elementsConst() * subDTypep()->widthTotalBytes();
    }
-    inline int left() const;
-    inline int right() const;
-    inline int hi() const;
-    inline int lo() const;
-    inline int elementsConst() const;
-    inline VNumRange declRange() const;
+    inline int left() const VL_MT_STABLE;
+    inline int right() const VL_MT_STABLE;
+    inline int hi() const VL_MT_STABLE;
+    inline int lo() const VL_MT_STABLE;
+    inline int elementsConst() const VL_MT_STABLE;
+    inline VNumRange declRange() const VL_MT_STABLE;
 };
 class AstNodeUOrStructDType VL_NOT_FINAL : public AstNodeDType {
    // A struct or union; common handling
    // @astgen op1 := membersp : List[AstMemberDType]
 private:
-    // TYPES
-    using MemberNameMap = std::map<const std::string, AstMemberDType*>;
    // MEMBERS
    string m_name;  // Name from upper typedef, if any
-    MemberNameMap m_members;
+    AstNodeModule* m_classOrPackagep = nullptr;  // Package it will be emitted with
    const int m_uniqueNum;
    bool m_packed;
    bool m_isFourstate = false;  // V3Width computes
@@ -228,7 +229,7 @@ public:
                    : VN_AS(findBitRangeDType(VNumRange{width() - 1, 0}, width(), numeric()),
                            BasicDType));
    }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
    // (Slow) recurses - Structure alignment 1,2,4 or 8 bytes (arrays affect this)
@@ -238,23 +239,19 @@ public:
    bool similarDType(const AstNodeDType* samep) const override {
        return this == samep;  // We don't compare members, require exact equivalence
    }
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    void name(const string& flag) override { m_name = flag; }
    bool packed() const VL_MT_SAFE { return m_packed; }
    void packed(bool flag) { m_packed = flag; }
    // packed() but as don't support unpacked, presently all structs
    static bool packedUnsup() { return true; }
    void isFourstate(bool flag) { m_isFourstate = flag; }
-    bool isFourstate() const override { return m_isFourstate; }
-    void clearCache() { m_members.clear(); }
-    void repairMemberCache();
-    AstMemberDType* findMember(const string& name) const {
-        const auto it = m_members.find(name);
-        return (it == m_members.end()) ? nullptr : it->second;
-    }
+    bool isFourstate() const override VL_MT_SAFE { return m_isFourstate; }
    static int lo() { return 0; }
    int hi() const { return dtypep()->width() - 1; }  // Packed classes look like arrays
    VNumRange declRange() const { return VNumRange{hi(), lo()}; }
+    AstNodeModule* classOrPackagep() const { return m_classOrPackagep; }
+    void classOrPackagep(AstNodeModule* classpackagep) { m_classOrPackagep = classpackagep; }
 };

 // === Concrete node types =====================================================
@@ -275,7 +272,7 @@ public:
        this->valuep(valuep);
    }
    ASTGEN_MEMBERS_AstEnumItem;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    bool maybePointedTo() const override { return true; }
    bool hasDType() const override { return true; }
    void name(const string& flag) override { m_name = flag; }
@@ -331,7 +328,7 @@ public:
    void dumpSmall(std::ostream& str) const override;
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
    AstNodeDType* getChild2DTypep() const override { return keyChildDTypep(); }
-    AstNodeDType* subDTypep() const override VL_MT_SAFE {
+    AstNodeDType* subDTypep() const override VL_MT_STABLE {
        return m_refDTypep ? m_refDTypep : childDTypep();
    }
    void refDTypep(AstNodeDType* nodep) { m_refDTypep = nodep; }
@@ -340,13 +337,13 @@ public:
    AstNodeDType* virtRefDType2p() const override { return m_keyDTypep; }
    void virtRefDType2p(AstNodeDType* nodep) override { keyDTypep(nodep); }
    //
-    AstNodeDType* keyDTypep() const VL_MT_SAFE {
+    AstNodeDType* keyDTypep() const VL_MT_STABLE {
        return m_keyDTypep ? m_keyDTypep : keyChildDTypep();
    }
    void keyDTypep(AstNodeDType* nodep) { m_keyDTypep = nodep; }
    // METHODS
-    AstBasicDType* basicp() const override VL_MT_SAFE { return nullptr; }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return nullptr; }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
    int widthAlignBytes() const override { return subDTypep()->widthAlignBytes(); }
@@ -396,14 +393,11 @@ public:
    ASTGEN_MEMBERS_AstBasicDType;
    void dump(std::ostream& str) const override;
    // width/widthMin/numeric compared elsewhere
-    bool same(const AstNode* samep) const override {
-        const AstBasicDType* const sp = static_cast<const AstBasicDType*>(samep);
-        return m == sp->m;
-    }
+    bool same(const AstNode* samep) const override;
    bool similarDType(const AstNodeDType* samep) const override {
        return type() == samep->type() && same(samep);
    }
-    string name() const override { return m.m_keyword.ascii(); }
+    string name() const override VL_MT_STABLE { return m.m_keyword.ascii(); }
    string prettyDTypeName() const override;
    const char* broken() const override {
        BROKEN_RTN(dtypep() != this);
@@ -418,8 +412,8 @@ public:
        }
    }
    // METHODS
-    AstBasicDType* basicp() const override VL_MT_SAFE { return (AstBasicDType*)this; }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return (AstBasicDType*)this; }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
    // (Slow) recurses - Structure alignment 1,2,4 or 8 bytes (arrays affect this)
@@ -435,6 +429,7 @@ public:
    bool isEvent() const VL_MT_SAFE { return keyword() == VBasicDTypeKwd::EVENT; }
    bool isTriggerVec() const VL_MT_SAFE { return keyword() == VBasicDTypeKwd::TRIGGERVEC; }
    bool isForkSync() const VL_MT_SAFE { return keyword() == VBasicDTypeKwd::FORK_SYNC; }
+    bool isProcessRef() const VL_MT_SAFE { return keyword() == VBasicDTypeKwd::PROCESS_REFERENCE; }
    bool isDelayScheduler() const VL_MT_SAFE {
        return keyword() == VBasicDTypeKwd::DELAY_SCHEDULER;
    }
@@ -462,14 +457,15 @@ public:
    inline int hi() const;
    inline int lo() const;
    inline int elements() const;
-    int left() const { return littleEndian() ? lo() : hi(); }  // How to show a declaration
-    int right() const { return littleEndian() ? hi() : lo(); }
-    inline bool littleEndian() const;
+    int left() const { return ascending() ? lo() : hi(); }  // How to show a declaration
+    int right() const { return ascending() ? hi() : lo(); }
+    inline bool ascending() const;
    bool implicit() const { return keyword() == VBasicDTypeKwd::LOGIC_IMPLICIT; }
    bool untyped() const { return keyword() == VBasicDTypeKwd::UNTYPED; }
    VNumRange declRange() const { return isRanged() ? VNumRange{left(), right()} : VNumRange{}; }
    void cvtRangeConst();  // Convert to smaller representation
    bool isCompound() const override { return isString(); }
+    bool isIntegralOrPacked() const override { return keyword().isIntNumeric(); }
 };
 class AstBracketArrayDType final : public AstNodeDType {
    // Associative/Queue/Normal array data type, ie "[dtype_or_expr]"
@@ -485,13 +481,13 @@ public:
    }
    ASTGEN_MEMBERS_AstBracketArrayDType;
    bool similarDType(const AstNodeDType* samep) const override { V3ERROR_NA_RETURN(false); }
-    AstNodeDType* subDTypep() const override { return childDTypep(); }
+    AstNodeDType* subDTypep() const override VL_MT_STABLE { return childDTypep(); }
    // METHODS
    // Will be removed in V3Width, which relies on this
    // being a child not a dtype pointed node
    bool maybePointedTo() const override { return false; }
-    AstBasicDType* basicp() const override VL_MT_SAFE { return nullptr; }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return nullptr; }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
    int widthAlignBytes() const override { V3ERROR_NA_RETURN(0); }
@@ -524,19 +520,19 @@ public:
    }
    void dump(std::ostream& str = std::cout) const override;
    void dumpSmall(std::ostream& str) const override;
-    string name() const override;
-    AstBasicDType* basicp() const override VL_MT_SAFE { return nullptr; }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    string name() const override VL_MT_STABLE;
+    AstBasicDType* basicp() const override VL_MT_STABLE { return nullptr; }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
    int widthAlignBytes() const override { return 0; }
    int widthTotalBytes() const override { return 0; }
    AstNodeDType* virtRefDTypep() const override { return nullptr; }
    void virtRefDTypep(AstNodeDType* nodep) override {}
-    AstNodeDType* subDTypep() const override { return nullptr; }
+    AstNodeDType* subDTypep() const override VL_MT_SAFE { return nullptr; }
    AstNodeModule* classOrPackagep() const { return m_classOrPackagep; }
    void classOrPackagep(AstNodeModule* nodep) { m_classOrPackagep = nodep; }
-    AstClass* classp() const { return m_classp; }
+    AstClass* classp() const VL_MT_STABLE { return m_classp; }
    void classp(AstClass* nodep) { m_classp = nodep; }
    bool isCompound() const override { return true; }
 };
@@ -572,13 +568,15 @@ public:
        return skipRefp()->similarDType(samep->skipRefp());
    }
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const override { return m_refDTypep ? m_refDTypep : childDTypep(); }
+    AstNodeDType* subDTypep() const override VL_MT_STABLE {
+        return m_refDTypep ? m_refDTypep : childDTypep();
+    }
    void refDTypep(AstNodeDType* nodep) { m_refDTypep = nodep; }
    AstNodeDType* virtRefDTypep() const override { return m_refDTypep; }
    void virtRefDTypep(AstNodeDType* nodep) override { refDTypep(nodep); }
    // METHODS
-    AstBasicDType* basicp() const override VL_MT_SAFE { return subDTypep()->basicp(); }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return subDTypep()->skipRefp(); }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return subDTypep()->basicp(); }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return subDTypep()->skipRefp(); }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return subDTypep()->skipRefToEnump(); }
    int widthAlignBytes() const override { return subDTypep()->widthAlignBytes(); }
@@ -619,18 +617,20 @@ public:
        return type() == samep->type() && same(samep);
    }
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const override { return dtypep() ? dtypep() : childDTypep(); }
+    AstNodeDType* subDTypep() const override VL_MT_STABLE {
+        return dtypep() ? dtypep() : childDTypep();
+    }
    void* containerp() const { return m_containerp; }
    // METHODS
    // op1 = Range of variable
    AstNodeDType* dtypeSkipRefp() const { return dtypep()->skipRefp(); }
-    AstBasicDType* basicp() const override VL_MT_SAFE { return subDTypep()->basicp(); }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return subDTypep()->basicp(); }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
    int widthAlignBytes() const override { return dtypep()->widthAlignBytes(); }
    int widthTotalBytes() const override { return dtypep()->widthTotalBytes(); }
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    void name(const string& flag) override { m_name = flag; }
    bool isCompound() const override { return false; }
 };
@@ -673,15 +673,15 @@ public:
    string prettyDTypeName() const override;
    void dumpSmall(std::ostream& str) const override;
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const override VL_MT_SAFE {
+    AstNodeDType* subDTypep() const override VL_MT_STABLE {
        return m_refDTypep ? m_refDTypep : childDTypep();
    }
    void refDTypep(AstNodeDType* nodep) { m_refDTypep = nodep; }
    AstNodeDType* virtRefDTypep() const override { return m_refDTypep; }
    void virtRefDTypep(AstNodeDType* nodep) override { refDTypep(nodep); }
    // METHODS
-    AstBasicDType* basicp() const override VL_MT_SAFE { return nullptr; }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return nullptr; }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
    int widthAlignBytes() const override { return subDTypep()->widthAlignBytes(); }
@@ -700,13 +700,13 @@ public:
    bool hasDType() const override { return true; }
    bool maybePointedTo() const override { return true; }
    bool undead() const override { return true; }
-    AstNodeDType* subDTypep() const override { return nullptr; }
+    AstNodeDType* subDTypep() const override VL_MT_SAFE { return nullptr; }
    AstNodeDType* virtRefDTypep() const override { return nullptr; }
    void virtRefDTypep(AstNodeDType* nodep) override {}
    bool similarDType(const AstNodeDType* samep) const override { return this == samep; }
-    AstBasicDType* basicp() const override VL_MT_SAFE { return nullptr; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return nullptr; }
    // cppcheck-suppress csyleCast
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    // cppcheck-suppress csyleCast
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    // cppcheck-suppress csyleCast
@@ -750,17 +750,19 @@ public:
    }
    bool similarDType(const AstNodeDType* samep) const override { return this == samep; }
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const override { return m_refDTypep ? m_refDTypep : childDTypep(); }
+    AstNodeDType* subDTypep() const override VL_MT_STABLE {
+        return m_refDTypep ? m_refDTypep : childDTypep();
+    }
    void refDTypep(AstNodeDType* nodep) { m_refDTypep = nodep; }
    AstNodeDType* virtRefDTypep() const override { return m_refDTypep; }
    void virtRefDTypep(AstNodeDType* nodep) override { refDTypep(nodep); }
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    void name(const string& flag) override { m_name = flag; }
    void dump(std::ostream& str = std::cout) const override;
    void dumpSmall(std::ostream& str) const override;
    // METHODS
-    AstBasicDType* basicp() const override VL_MT_SAFE { return subDTypep()->basicp(); }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return subDTypep()->skipRefp(); }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return subDTypep()->basicp(); }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return subDTypep()->skipRefp(); }
    AstNodeDType* skipRefToConstp() const override { return subDTypep()->skipRefToConstp(); }
    // cppcheck-suppress csyleCast
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
@@ -812,8 +814,8 @@ public:
    void dump(std::ostream& str = std::cout) const override;
    void dumpSmall(std::ostream& str) const override;
    void cloneRelink() override;
-    AstBasicDType* basicp() const override VL_MT_SAFE { return nullptr; }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return nullptr; }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
    bool similarDType(const AstNodeDType* samep) const override { return this == samep; }
@@ -839,6 +841,7 @@ class AstMemberDType final : public AstNodeDType {
    // A member of a struct/union
    // PARENT: AstNodeUOrStructDType
    // @astgen op1 := childDTypep : Optional[AstNodeDType]
+    // @astgen op3 := valuep : Optional[AstNode]
 private:
    AstNodeDType* m_refDTypep = nullptr;  // Elements of this type (after widthing)
    string m_name;  // Name of variable
@@ -846,10 +849,12 @@ private:
    int m_lsb = -1;  // Within this level's packed struct, the LSB of the first bit of the member
    // UNSUP: int m_randType;    // Randomization type (IEEE)
 public:
-    AstMemberDType(FileLine* fl, const string& name, VFlagChildDType, AstNodeDType* dtp)
+    AstMemberDType(FileLine* fl, const string& name, VFlagChildDType, AstNodeDType* dtp,
+                   AstNode* valuep)
        : ASTGEN_SUPER_MemberDType(fl)
        , m_name{name} {
        childDTypep(dtp);  // Only for parser
+        this->valuep(valuep);
        dtypep(nullptr);  // V3Width will resolve
        refDTypep(nullptr);
    }
@@ -862,7 +867,8 @@ public:
        widthFromSub(subDTypep());
    }
    ASTGEN_MEMBERS_AstMemberDType;
-    string name() const override { return m_name; }  // * = Var name
+    void dumpSmall(std::ostream& str) const override;
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Var name
    bool hasDType() const override { return true; }
    bool maybePointedTo() const override { return true; }
    const char* broken() const override {
@@ -873,7 +879,10 @@ public:
        if (m_refDTypep && m_refDTypep->clonep()) m_refDTypep = m_refDTypep->clonep();
    }
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const override { return m_refDTypep ? m_refDTypep : childDTypep(); }
+    AstNodeUOrStructDType* getChildStructp() const;
+    AstNodeDType* subDTypep() const override VL_MT_STABLE {
+        return m_refDTypep ? m_refDTypep : childDTypep();
+    }
    void refDTypep(AstNodeDType* nodep) { m_refDTypep = nodep; }
    AstNodeDType* virtRefDTypep() const override { return m_refDTypep; }
    void virtRefDTypep(AstNodeDType* nodep) override { refDTypep(nodep); }
@@ -881,10 +890,10 @@ public:
    //
    // (Slow) recurse down to find basic data type (Note don't need virtual -
    // AstVar isn't a NodeDType)
-    AstBasicDType* basicp() const override VL_MT_SAFE { return subDTypep()->basicp(); }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return subDTypep()->basicp(); }
    // op1 = Range of variable (Note don't need virtual - AstVar isn't a NodeDType)
    AstNodeDType* dtypeSkipRefp() const { return subDTypep()->skipRefp(); }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return subDTypep()->skipRefp(); }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return subDTypep()->skipRefp(); }
    AstNodeDType* skipRefToConstp() const override { return subDTypep()->skipRefToConstp(); }
    AstNodeDType* skipRefToEnump() const override { return subDTypep()->skipRefToEnump(); }
    // (Slow) recurses - Structure alignment 1,2,4 or 8 bytes (arrays affect this)
@@ -921,9 +930,11 @@ public:
    ASTGEN_MEMBERS_AstParamTypeDType;
    void dump(std::ostream& str = std::cout) const override;
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const override { return dtypep() ? dtypep() : childDTypep(); }
-    AstBasicDType* basicp() const override VL_MT_SAFE { return subDTypep()->basicp(); }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return subDTypep()->skipRefp(); }
+    AstNodeDType* subDTypep() const override VL_MT_STABLE {
+        return dtypep() ? dtypep() : childDTypep();
+    }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return subDTypep()->basicp(); }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return subDTypep()->skipRefp(); }
    AstNodeDType* skipRefToConstp() const override { return subDTypep()->skipRefToConstp(); }
    AstNodeDType* skipRefToEnump() const override { return subDTypep()->skipRefToEnump(); }
    bool similarDType(const AstNodeDType* samep) const override {
@@ -934,7 +945,7 @@ public:
    int widthAlignBytes() const override { return dtypep()->widthAlignBytes(); }
    int widthTotalBytes() const override { return dtypep()->widthTotalBytes(); }
    // METHODS
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    bool maybePointedTo() const override { return true; }
    bool hasDType() const override { return true; }
    void name(const string& flag) override { m_name = flag; }
@@ -957,8 +968,8 @@ public:
    AstNodeDType* dtypep() const { return nullptr; }
    // METHODS
    bool similarDType(const AstNodeDType* samep) const override { return this == samep; }
-    AstBasicDType* basicp() const override VL_MT_SAFE { return nullptr; }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return nullptr; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return nullptr; }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return nullptr; }
    // cppcheck-suppress csyleCast
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    // cppcheck-suppress csyleCast
@@ -1012,17 +1023,17 @@ public:
    void dumpSmall(std::ostream& str) const override;
    string prettyDTypeName() const override;
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const override VL_MT_SAFE {
+    AstNodeDType* subDTypep() const override VL_MT_STABLE {
        return m_refDTypep ? m_refDTypep : childDTypep();
    }
    void refDTypep(AstNodeDType* nodep) { m_refDTypep = nodep; }
-    inline int boundConst() const;
+    inline int boundConst() const VL_MT_STABLE;
    AstNodeDType* virtRefDTypep() const override { return m_refDTypep; }
    void virtRefDTypep(AstNodeDType* nodep) override { refDTypep(nodep); }
    // METHODS
-    AstBasicDType* basicp() const override VL_MT_SAFE { return nullptr; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return nullptr; }
    // cppcheck-suppress csyleCast
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    // cppcheck-suppress csyleCast
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    // cppcheck-suppress csyleCast
@@ -1042,7 +1053,7 @@ private:
    // Post-width typedefs are removed and point to type directly
    AstNodeDType* m_refDTypep = nullptr;  // data type pointed to, BELOW the AstTypedef
    string m_name;  // Name of an AstTypedef
-    AstNodeModule* m_classOrPackagep = nullptr;  // Package hierarchy
+    AstNodeModule* m_classOrPackagep = nullptr;  // Class/package in which it was defined
 public:
    AstRefDType(FileLine* fl, const string& name)
        : ASTGEN_SUPER_RefDType(fl)
@@ -1057,6 +1068,7 @@ public:
    AstRefDType(FileLine* fl, FlagTypeOfExpr, AstNode* typeofp)
        : ASTGEN_SUPER_RefDType(fl) {
        this->typeofp(typeofp);
+        if (AstNodeDType* const dtp = VN_CAST(typeofp, NodeDType)) refDTypep(dtp);
    }
    ASTGEN_MEMBERS_AstRefDType;
    // METHODS
@@ -1072,15 +1084,15 @@ public:
    }
    void dump(std::ostream& str = std::cout) const override;
    void dumpSmall(std::ostream& str) const override;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    string prettyDTypeName() const override {
        return subDTypep() ? prettyName(subDTypep()->name()) : prettyName();
    }
-    AstBasicDType* basicp() const override VL_MT_SAFE {
+    AstBasicDType* basicp() const override VL_MT_STABLE {
        return subDTypep() ? subDTypep()->basicp() : nullptr;
    }
-    AstNodeDType* subDTypep() const override;
-    AstNodeDType* skipRefp() const override VL_MT_SAFE {
+    AstNodeDType* subDTypep() const override VL_MT_STABLE;
+    AstNodeDType* skipRefp() const override VL_MT_STABLE {
        // Skip past both the Ref and the Typedef
        if (subDTypep()) {
            return subDTypep()->skipRefp();
@@ -1109,9 +1121,9 @@ public:
    int widthTotalBytes() const override { return dtypeSkipRefp()->widthTotalBytes(); }
    void name(const string& flag) override { m_name = flag; }
    AstNodeDType* dtypeSkipRefp() const { return subDTypep()->skipRefp(); }
-    AstTypedef* typedefp() const { return m_typedefp; }
+    AstTypedef* typedefp() const VL_MT_SAFE { return m_typedefp; }
    void typedefp(AstTypedef* nodep) { m_typedefp = nodep; }
-    AstNodeDType* refDTypep() const { return m_refDTypep; }
+    AstNodeDType* refDTypep() const VL_MT_SAFE { return m_refDTypep; }
    void refDTypep(AstNodeDType* nodep) { m_refDTypep = nodep; }
    AstNodeDType* virtRefDTypep() const override { return refDTypep(); }
    void virtRefDTypep(AstNodeDType* nodep) override { refDTypep(nodep); }
@@ -1153,19 +1165,49 @@ public:
    void dumpSmall(std::ostream& str) const override;
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
    // op1 = Range of variable
-    AstNodeDType* subDTypep() const override { return m_refDTypep ? m_refDTypep : childDTypep(); }
+    AstNodeDType* subDTypep() const override VL_MT_STABLE {
+        return m_refDTypep ? m_refDTypep : childDTypep();
+    }
    void refDTypep(AstNodeDType* nodep) { m_refDTypep = nodep; }
    AstNodeDType* virtRefDTypep() const override { return m_refDTypep; }
    void virtRefDTypep(AstNodeDType* nodep) override { refDTypep(nodep); }
    // METHODS
-    AstBasicDType* basicp() const override { return subDTypep()->basicp(); }
-    AstNodeDType* skipRefp() const override { return (AstNodeDType*)this; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return subDTypep()->basicp(); }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
    int widthAlignBytes() const override { return sizeof(std::map<std::string, std::string>); }
    int widthTotalBytes() const override { return sizeof(std::map<std::string, std::string>); }
    bool isCompound() const override { return true; }
 };
+class AstStreamDType final : public AstNodeDType {
+    // Stream data type, used only as data type of stream operations
+    // Should behave like AstPackArrayDType, but it doesn't have a size
+public:
+    explicit AstStreamDType(FileLine* fl)
+        : ASTGEN_SUPER_StreamDType(fl) {
+        dtypep(this);
+    }
+    ASTGEN_MEMBERS_AstStreamDType;
+    void dumpSmall(std::ostream& str) const override;
+    bool hasDType() const override { return true; }
+    bool maybePointedTo() const override { return true; }
+    bool undead() const override { return true; }
+    AstNodeDType* subDTypep() const override VL_MT_SAFE { return nullptr; }
+    AstNodeDType* virtRefDTypep() const override { return nullptr; }
+    void virtRefDTypep(AstNodeDType* nodep) override {}
+    bool similarDType(const AstNodeDType* samep) const override { return this == samep; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return nullptr; }
+    // cppcheck-suppress csyleCast
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
+    // cppcheck-suppress csyleCast
+    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
+    // cppcheck-suppress csyleCast
+    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
+    int widthAlignBytes() const override { return 1; }
+    int widthTotalBytes() const override { return 1; }
+    bool isCompound() const override { return false; }
+};
 class AstUnsizedArrayDType final : public AstNodeDType {
    // Unsized/open-range Array data type, ie "some_dtype var_name []"
    // @astgen op1 := childDTypep : Optional[AstNodeDType] // moved to refDTypep() in V3Width
@@ -1191,13 +1233,15 @@ public:
    bool similarDType(const AstNodeDType* samep) const override;
    void dumpSmall(std::ostream& str) const override;
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const override { return m_refDTypep ? m_refDTypep : childDTypep(); }
+    AstNodeDType* subDTypep() const override VL_MT_STABLE {
+        return m_refDTypep ? m_refDTypep : childDTypep();
+    }
    void refDTypep(AstNodeDType* nodep) { m_refDTypep = nodep; }
    AstNodeDType* virtRefDTypep() const override { return m_refDTypep; }
    void virtRefDTypep(AstNodeDType* nodep) override { refDTypep(nodep); }
    // METHODS
-    AstBasicDType* basicp() const override VL_MT_SAFE { return subDTypep()->basicp(); }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return subDTypep()->basicp(); }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
    int widthAlignBytes() const override { return subDTypep()->widthAlignBytes(); }
@@ -1216,13 +1260,13 @@ public:
    bool hasDType() const override { return true; }
    bool maybePointedTo() const override { return true; }
    bool undead() const override { return true; }
-    AstNodeDType* subDTypep() const override { return nullptr; }
+    AstNodeDType* subDTypep() const override VL_MT_SAFE { return nullptr; }
    AstNodeDType* virtRefDTypep() const override { return nullptr; }
    void virtRefDTypep(AstNodeDType* nodep) override {}
    bool similarDType(const AstNodeDType* samep) const override { return this == samep; }
-    AstBasicDType* basicp() const override VL_MT_SAFE { return nullptr; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return nullptr; }
    // cppcheck-suppress csyleCast
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    // cppcheck-suppress csyleCast
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    // cppcheck-suppress csyleCast
@@ -1256,15 +1300,15 @@ public:
    bool similarDType(const AstNodeDType* samep) const override;
    void dumpSmall(std::ostream& str) const override;
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const override VL_MT_SAFE {
+    AstNodeDType* subDTypep() const override VL_MT_STABLE {
        return m_refDTypep ? m_refDTypep : childDTypep();
    }
    void refDTypep(AstNodeDType* nodep) { m_refDTypep = nodep; }
    AstNodeDType* virtRefDTypep() const override { return m_refDTypep; }
    void virtRefDTypep(AstNodeDType* nodep) override { refDTypep(nodep); }
    // METHODS
-    AstBasicDType* basicp() const override VL_MT_SAFE { return subDTypep()->basicp(); }
-    AstNodeDType* skipRefp() const override VL_MT_SAFE { return (AstNodeDType*)this; }
+    AstBasicDType* basicp() const override VL_MT_STABLE { return subDTypep()->basicp(); }
+    AstNodeDType* skipRefp() const override VL_MT_STABLE { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToConstp() const override { return (AstNodeDType*)this; }
    AstNodeDType* skipRefToEnump() const override { return (AstNodeDType*)this; }
    int widthAlignBytes() const override { return sizeof(std::map<std::string, std::string>); }
@@ -1315,19 +1359,17 @@ public:
    std::vector<AstUnpackArrayDType*> unpackDimensions();
    void isCompound(bool flag) { m_isCompound = flag; }
    bool isCompound() const override VL_MT_SAFE { return m_isCompound; }
+    bool isIntegralOrPacked() const override { return false; }
 };

 // === AstNodeUOrStructDType ===
 class AstStructDType final : public AstNodeUOrStructDType {
-    AstNodeModule* m_classOrPackagep = nullptr;  // Package hierarchy
 public:
    // VSigning below is mispurposed to indicate if packed or not
    AstStructDType(FileLine* fl, VSigning numericUnpack)
        : ASTGEN_SUPER_StructDType(fl, numericUnpack) {}
    ASTGEN_MEMBERS_AstStructDType;
    string verilogKwd() const override { return "struct"; }
-    AstNodeModule* classOrPackagep() const { return m_classOrPackagep; }
-    void classOrPackagep(AstNodeModule* classpackagep) { m_classOrPackagep = classpackagep; }
 };
 class AstUnionDType final : public AstNodeUOrStructDType {
 public:
@@ -214,7 +214,7 @@ class AstNodeFTaskRef VL_NOT_FINAL : public AstNodeExpr {
    // @astgen op3 := pinsp : List[AstNodeExpr]
    // @astgen op4 := scopeNamep : Optional[AstScopeName]
    AstNodeFTask* m_taskp = nullptr;  // [AfterLink] Pointer to task referenced
-    AstNodeModule* m_classOrPackagep = nullptr;  // Package hierarchy
+    AstNodeModule* m_classOrPackagep = nullptr;  // Class/package of the task
    string m_name;  // Name of variable
    string m_dotted;  // Dotted part of scope the name()ed task/func is under or ""
    string m_inlinedDots;  // Dotted hierarchy flattened out
@@ -236,7 +236,7 @@ public:
    const char* broken() const override;
    void cloneRelink() override;
    void dump(std::ostream& str = std::cout) const override;
-    string name() const override { return m_name; }  // * = Var name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Var name
    bool isGateOptimizable() const override;
    string dotted() const { return m_dotted; }  // * = Scope name or ""
    string inlinedDots() const { return m_inlinedDots; }
@@ -249,6 +249,7 @@ public:
    void classOrPackagep(AstNodeModule* nodep) { m_classOrPackagep = nodep; }
    bool pli() const { return m_pli; }
    void pli(bool flag) { m_pli = flag; }
+    bool isPure() const override;

    string emitVerilog() final override { V3ERROR_NA_RETURN(""); }
    string emitC() final override { V3ERROR_NA_RETURN(""); }
@@ -321,7 +322,7 @@ public:
    ASTGEN_MEMBERS_AstNodeTermop;
    // Know no children, and hot function, so skip iterator for speed
    // cppcheck-suppress functionConst
-    void iterateChildren(VNVisitor& v) {}
+    void iterateChildren(VNVisitorConst& v) {}
    void dump(std::ostream& str) const override;
 };
 class AstNodeTriop VL_NOT_FINAL : public AstNodeExpr {
@@ -448,21 +449,18 @@ class AstNodeVarRef VL_NOT_FINAL : public AstNodeExpr {
    VAccess m_access;  // Left hand side assignment
    AstVar* m_varp;  // [AfterLink] Pointer to variable itself
    AstVarScope* m_varScopep = nullptr;  // Varscope for hierarchy
-    AstNodeModule* m_classOrPackagep = nullptr;  // Package hierarchy
-    string m_name;  // Name of variable
+    AstNodeModule* m_classOrPackagep = nullptr;  // Class/package of the variable
    string m_selfPointer;  // Output code object pointer (e.g.: 'this')

 protected:
-    AstNodeVarRef(VNType t, FileLine* fl, const string& name, const VAccess& access)
+    AstNodeVarRef(VNType t, FileLine* fl, const VAccess& access)
        : AstNodeExpr{t, fl}
-        , m_access{access}
-        , m_name{name} {
+        , m_access{access} {
        varp(nullptr);
    }
-    AstNodeVarRef(VNType t, FileLine* fl, const string& name, AstVar* varp, const VAccess& access)
+    AstNodeVarRef(VNType t, FileLine* fl, AstVar* varp, const VAccess& access)
        : AstNodeExpr{t, fl}
-        , m_access{access}
-        , m_name{name} {
+        , m_access{access} {
        // May have varp==nullptr
        this->varp(varp);
    }
@@ -473,8 +471,6 @@ public:
    const char* broken() const override;
    int instrCount() const override { return widthInstrs(); }
    void cloneRelink() override;
-    string name() const override { return m_name; }  // * = Var name
-    void name(const string& name) override { m_name = name; }
    VAccess access() const { return m_access; }
    void access(const VAccess& flag) { m_access = flag; }  // Avoid using this; Set in constructor
    AstVar* varp() const { return m_varp; }  // [After Link] Pointer to variable
@@ -491,7 +487,7 @@ public:
    void classOrPackagep(AstNodeModule* nodep) { m_classOrPackagep = nodep; }
    // Know no children, and hot function, so skip iterator for speed
    // cppcheck-suppress functionConst
-    void iterateChildren(VNVisitor& v) {}
+    void iterateChildren(VNVisitorConst& v) {}
 };

 // === Concrete node types =====================================================
@@ -531,7 +527,7 @@ public:
    }
    ASTGEN_MEMBERS_AstArg;
    bool hasDType() const override { return false; }
-    string name() const override { return m_name; }  // * = Pin name, ""=go by number
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Pin name, ""=go by number
    void name(const string& name) override { m_name = name; }
    bool emptyConnectNoNext() const { return !exprp() && name() == "" && !nextp(); }

@@ -609,7 +605,7 @@ public:
        this->addPinsp(pinsp);
    }
    ASTGEN_MEMBERS_AstCMethodHard;
-    string name() const override { return m_name; }  // * = Var name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Var name
    void name(const string& name) override { m_name = name; }
    bool same(const AstNode* samep) const override {
        const AstCMethodHard* asamep = static_cast<const AstCMethodHard*>(samep);
@@ -643,7 +639,7 @@ public:
    string emitC() override { V3ERROR_NA_RETURN(""); }
    bool cleanOut() const override { V3ERROR_NA_RETURN(true); }
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const { return dtypep() ? dtypep() : childDTypep(); }
+    AstNodeDType* subDTypep() const VL_MT_STABLE { return dtypep() ? dtypep() : childDTypep(); }
 };
 class AstCastParse final : public AstNodeExpr {
    // Cast to appropriate type, where we haven't determined yet what the data type is
@@ -688,7 +684,7 @@ public:
    }
    ASTGEN_MEMBERS_AstCellArrayRef;
    // ACCESSORS
-    string name() const override { return m_name; }  // * = Array name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Array name

    string emitVerilog() override { V3ERROR_NA_RETURN(""); }
    string emitC() override { V3ERROR_NA_RETURN(""); }
@@ -709,7 +705,7 @@ public:
    }
    ASTGEN_MEMBERS_AstCellRef;
    // ACCESSORS
-    string name() const override { return m_name; }  // * = Array name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Array name

    string emitVerilog() override { V3ERROR_NA_RETURN(""); }
    string emitC() override { V3ERROR_NA_RETURN(""); }
@@ -720,7 +716,7 @@ class AstClassOrPackageRef final : public AstNodeExpr {
 private:
    string m_name;
    // Node not NodeModule to appease some early parser usage
-    AstNode* m_classOrPackageNodep;  // Package hierarchy
+    AstNode* m_classOrPackageNodep;  // Pointer to class/package referenced
 public:
    AstClassOrPackageRef(FileLine* fl, const string& name, AstNode* classOrPackageNodep,
                         AstPin* paramsp)
@@ -745,7 +741,7 @@ public:
                == static_cast<const AstClassOrPackageRef*>(samep)->m_classOrPackageNodep);
    }
    void dump(std::ostream& str = std::cout) const override;
-    string name() const override { return m_name; }  // * = Var name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Var name
    AstNode* classOrPackageNodep() const { return m_classOrPackageNodep; }
    void classOrPackageNodep(AstNode* nodep) { m_classOrPackageNodep = nodep; }
    AstNodeModule* classOrPackagep() const;
@@ -790,6 +786,51 @@ public:
    int instrCount() const override { return widthInstrs(); }
    bool same(const AstNode* /*samep*/) const override { return true; }
 };
+class AstConsPackMember final : public AstNodeExpr {
+    // Construct a packed array single emement [member1: value1]
+    // Don't need the member we are constructing, as the dtypep can get us to it
+    // @astgen op2 := rhsp : AstNodeExpr
+public:
+    explicit AstConsPackMember(FileLine* fl, AstMemberDType* dtypep, AstNodeExpr* rhsp)
+        : ASTGEN_SUPER_ConsPackMember(fl) {
+        this->dtypep(dtypep);
+        this->rhsp(rhsp);
+    }
+    ASTGEN_MEMBERS_AstConsPackMember;
+    const char* broken() const override {
+        BROKEN_RTN(dtypep() && !VN_IS(dtypep(), MemberDType));
+        return nullptr;
+    }
+    string emitVerilog() override { V3ERROR_NA_RETURN(""); }
+    string emitC() override { V3ERROR_NA_RETURN(""); }
+    string emitSimpleOperator() override { V3ERROR_NA_RETURN(""); }
+    bool cleanOut() const override { return true; }
+    int instrCount() const override { return widthInstrs(); }
+    bool same(const AstNode* /*samep*/) const override { return true; }
+};
+class AstConsPackUOrStruct final : public AstNodeExpr {
+    // Construct a packed struct and return object, '{member1: value1, member2: value2}
+    // Don't need the class we are constructing, as the dtypep can get us to it
+    // @astgen op1 := membersp : List[AstConsPackMember]
+public:
+    explicit AstConsPackUOrStruct(FileLine* fl, AstNodeUOrStructDType* dtypep,
+                                  AstConsPackMember* membersp = nullptr)
+        : ASTGEN_SUPER_ConsPackUOrStruct(fl) {
+        this->dtypep(dtypep);
+        this->addMembersp(membersp);
+    }
+    ASTGEN_MEMBERS_AstConsPackUOrStruct;
+    const char* broken() const override {
+        BROKEN_RTN(dtypep() && !VN_IS(dtypep(), NodeUOrStructDType));
+        return nullptr;
+    }
+    string emitVerilog() override { V3ERROR_NA_RETURN(""); }
+    string emitC() override { V3ERROR_NA_RETURN(""); }
+    string emitSimpleOperator() override { V3ERROR_NA_RETURN(""); }
+    bool cleanOut() const override { return true; }
+    int instrCount() const override { return widthInstrs(); }
+    bool same(const AstNode* /*samep*/) const override { return true; }
+};
 class AstConsQueue final : public AstNodeExpr {
    // Construct a queue and return object, '{}. '{lhs}, '{lhs. rhs}
    // @astgen op1 := lhsp : Optional[AstNode]
@@ -929,6 +970,20 @@ public:
        , m_num(this, 1, on) {
        dtypeSetBit();
    }
+    class All0 {};
+    AstConst(FileLine* fl, All0)
+        : ASTGEN_SUPER_Const(fl)
+        , m_num(this, "'0") {
+        initWithNumber();
+        fl->warnOff(V3ErrorCode::NEWERSTD, true);
+    }
+    class All1 {};
+    AstConst(FileLine* fl, All1)
+        : ASTGEN_SUPER_Const(fl)
+        , m_num(this, "'1") {
+        initWithNumber();
+        fl->warnOff(V3ErrorCode::NEWERSTD, true);
+    }
    class Null {};
    AstConst(FileLine* fl, Null)
        : ASTGEN_SUPER_Const(fl)
@@ -944,7 +999,7 @@ public:
        initWithNumber();
    }
    ASTGEN_MEMBERS_AstConst;
-    string name() const override { return num().ascii(); }  // * = Value
+    string name() const override VL_MT_STABLE { return num().ascii(); }  // * = Value
    const V3Number& num() const VL_MT_SAFE { return m_num; }  // * = Value
    V3Number& num() { return m_num; }  // * = Value
    uint32_t toUInt() const { return num().toUInt(); }
@@ -1002,7 +1057,7 @@ public:
 };
 class AstEnumItemRef final : public AstNodeExpr {
    AstEnumItem* m_itemp;  // [AfterLink] Pointer to item
-    AstNodeModule* m_classOrPackagep;  // Package hierarchy
+    AstNodeModule* m_classOrPackagep;  // Class/package in which it was defined
 public:
    AstEnumItemRef(FileLine* fl, AstEnumItem* itemp, AstNodeModule* classOrPackagep)
        : ASTGEN_SUPER_EnumItemRef(fl)
@@ -1012,7 +1067,7 @@ public:
    }
    ASTGEN_MEMBERS_AstEnumItemRef;
    void dump(std::ostream& str) const override;
-    string name() const override { return itemp()->name(); }
+    string name() const override VL_MT_STABLE { return itemp()->name(); }
    int instrCount() const override { return 0; }
    const char* broken() const override;
    void cloneRelink() override {
@@ -1022,7 +1077,7 @@ public:
        const AstEnumItemRef* const sp = static_cast<const AstEnumItemRef*>(samep);
        return itemp() == sp->itemp();
    }
-    AstEnumItem* itemp() const { return m_itemp; }
+    AstEnumItem* itemp() const VL_MT_STABLE { return m_itemp; }
    string emitVerilog() override { V3ERROR_NA_RETURN(""); }
    string emitC() override { V3ERROR_NA_RETURN(""); }
    bool cleanOut() const override { return true; }
@@ -1046,7 +1101,7 @@ public:
    // METHODS
    string emitVerilog() override { V3ERROR_NA_RETURN(""); }
    string emitC() override { V3ERROR_NA_RETURN(""); }
-    bool cleanOut() const override { return false; }
+    bool cleanOut() const override { return true; }
    bool same(const AstNode*) const override { return true; }
 };
 class AstFError final : public AstNodeExpr {
@@ -1063,9 +1118,50 @@ public:
    string emitC() override { V3ERROR_NA_RETURN(""); }
    bool cleanOut() const override { return true; }
    int instrCount() const override { return widthInstrs() * 64; }
+    bool isPredictOptimizable() const override { return false; }
    bool isPure() const override { return false; }  // SPECIAL: $display has 'visual' ordering
    bool same(const AstNode* /*samep*/) const override { return true; }
 };
+class AstFOpen final : public AstNodeExpr {
+    // @astgen op2 := filenamep : AstNodeExpr
+    // @astgen op3 := modep : AstNodeExpr
+public:
+    AstFOpen(FileLine* fl, AstNodeExpr* filenamep, AstNodeExpr* modep)
+        : ASTGEN_SUPER_FOpen(fl) {
+        this->filenamep(filenamep);
+        this->modep(modep);
+    }
+    ASTGEN_MEMBERS_AstFOpen;
+    string emitVerilog() override { V3ERROR_NA_RETURN(""); }
+    string emitC() override { V3ERROR_NA_RETURN(""); }
+    bool cleanOut() const override { return true; }
+    string verilogKwd() const override { return "$fopen"; }
+    bool isGateOptimizable() const override { return false; }
+    bool isPredictOptimizable() const override { return false; }
+    bool isPure() const override { return false; }
+    bool isOutputter() const override { return true; }
+    bool isUnlikely() const override { return true; }
+    bool same(const AstNode* /*samep*/) const override { return true; }
+};
+class AstFOpenMcd final : public AstNodeExpr {
+    // @astgen op2 := filenamep : AstNodeExpr
+public:
+    AstFOpenMcd(FileLine* fl, AstNodeExpr* filenamep)
+        : ASTGEN_SUPER_FOpenMcd(fl) {
+        this->filenamep(filenamep);
+    }
+    ASTGEN_MEMBERS_AstFOpenMcd;
+    string emitVerilog() override { V3ERROR_NA_RETURN(""); }
+    string emitC() override { V3ERROR_NA_RETURN(""); }
+    bool cleanOut() const override { return true; }
+    string verilogKwd() const override { return "$fopen"; }
+    bool isGateOptimizable() const override { return false; }
+    bool isPredictOptimizable() const override { return false; }
+    bool isPure() const override { return false; }
+    bool isOutputter() const override { return true; }
+    bool isUnlikely() const override { return true; }
+    bool same(const AstNode* /*samep*/) const override { return true; }
+};
 class AstFRead final : public AstNodeExpr {
    // @astgen op1 := memp : AstNode // VarRef for result
    // @astgen op2 := filep : AstNode // file (must be a VarRef)
@@ -1122,7 +1218,7 @@ public:
        this->filep(filep);
    }
    ASTGEN_MEMBERS_AstFScanF;
-    string name() const override { return m_text; }
+    string name() const override VL_MT_STABLE { return m_text; }
    string verilogKwd() const override { return "$fscanf"; }
    string emitVerilog() override { V3ERROR_NA_RETURN(""); }
    string emitC() override { V3ERROR_NA_RETURN(""); }
@@ -1183,9 +1279,10 @@ class AstFell final : public AstNodeExpr {
    // @astgen op1 := exprp : AstNodeExpr
    // @astgen op2 := sentreep : Optional[AstSenTree]
 public:
-    AstFell(FileLine* fl, AstNodeExpr* exprp)
+    AstFell(FileLine* fl, AstNodeExpr* exprp, AstSenTree* sentreep)
        : ASTGEN_SUPER_Fell(fl) {
        this->exprp(exprp);
+        this->sentreep(sentreep);
    }
    ASTGEN_MEMBERS_AstFell;
    string emitVerilog() override { return "$fell(%l)"; }
@@ -1318,7 +1415,7 @@ public:
    string emitC() override { V3ERROR_NA_RETURN(""); }
    bool cleanOut() const override { return true; }
    int instrCount() const override { return widthInstrs(); }
-    string name() const override { return m_name; }  // * = Var name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Var name
    void name(const string& name) override { m_name = name; }
    bool index() const { return m_index; }
 };
@@ -1326,6 +1423,7 @@ class AstMemberSel final : public AstNodeExpr {
    // @astgen op1 := fromp : AstNodeExpr
    // Don't need the class we are extracting from, as the "fromp()"'s datatype can get us to it
    string m_name;
+    VAccess m_access;  // Read or write, as in AstNodeVarRef
    AstVar* m_varp = nullptr;  // Post link, variable within class that is target of selection
 public:
    AstMemberSel(FileLine* fl, AstNodeExpr* fromp, VFlagChildDType, const string& name)
@@ -1344,11 +1442,14 @@ public:
    void cloneRelink() override;
    const char* broken() const override;
    void dump(std::ostream& str) const override;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
+    void name(const string& name) override { m_name = name; }
+    VAccess access() const { return m_access; }
+    void access(const VAccess& flag) { m_access = flag; }
    string emitVerilog() override { V3ERROR_NA_RETURN(""); }
    string emitC() override { V3ERROR_NA_RETURN(""); }
-    bool cleanOut() const override { return false; }
-    bool same(const AstNode* samep) const override { return true; }  // dtype comparison does it
+    bool cleanOut() const override { return true; }
+    bool same(const AstNode* samep) const override;
    int instrCount() const override { return widthInstrs(); }
    AstVar* varp() const { return m_varp; }
    void varp(AstVar* nodep) { m_varp = nodep; }
@@ -1408,7 +1509,7 @@ public:
    }
    ASTGEN_MEMBERS_AstParseRef;
    void dump(std::ostream& str) const override;
-    string name() const override { return m_name; }  // * = Var name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Var name
    bool same(const AstNode* samep) const override {
        const AstParseRef* const asamep = static_cast<const AstParseRef*>(samep);
        return (expect() == asamep->expect() && m_name == asamep->m_name);
@@ -1485,7 +1586,7 @@ public:
    bool cleanOut() const override { V3ERROR_NA_RETURN(""); }
    int instrCount() const override { return widthInstrs(); }
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const { return dtypep() ? dtypep() : childDTypep(); }
+    AstNodeDType* subDTypep() const VL_MT_STABLE { return dtypep() ? dtypep() : childDTypep(); }
 };
 class AstRand final : public AstNodeExpr {
    // $random/$random(seed) or $urandom/$urandom(seed)
@@ -1531,14 +1632,35 @@ public:
    bool reset() const { return m_reset; }
    bool urandom() const { return m_urandom; }
 };
+class AstRandRNG final : public AstNodeExpr {
+    // Random used in a class using VlRNG
+    // Return a random number, based upon width()
+public:
+    AstRandRNG(FileLine* fl, AstNodeDType* dtp)
+        : ASTGEN_SUPER_RandRNG(fl) {
+        dtypep(dtp);
+    }
+    ASTGEN_MEMBERS_AstRandRNG;
+    string emitVerilog() override { return "%f$rngrandom()"; }
+    string emitC() override {
+        return isWide() ? "VL_RANDOM_RNG_%nq(__Vm_rng, %nw, %P)"  //
+                        : "VL_RANDOM_RNG_%nq(__Vm_rng)";
+    }
+    bool cleanOut() const override { return false; }
+    bool isGateOptimizable() const override { return false; }
+    bool isPredictOptimizable() const override { return false; }
+    int instrCount() const override { return INSTR_COUNT_PLI; }
+    bool same(const AstNode* /*samep*/) const override { return true; }
+};
 class AstRose final : public AstNodeExpr {
    // Verilog $rose
    // @astgen op1 := exprp : AstNodeExpr
    // @astgen op2 := sentreep : Optional[AstSenTree]
 public:
-    AstRose(FileLine* fl, AstNodeExpr* exprp)
+    AstRose(FileLine* fl, AstNodeExpr* exprp, AstSenTree* sentreep)
        : ASTGEN_SUPER_Rose(fl) {
        this->exprp(exprp);
+        this->sentreep(sentreep);
    }
    ASTGEN_MEMBERS_AstRose;
    string emitVerilog() override { return "$rose(%l)"; }
@@ -1581,7 +1703,7 @@ public:
        addExprsp(exprsp);
    }
    ASTGEN_MEMBERS_AstSFormatF;
-    string name() const override { return m_text; }
+    string name() const override VL_MT_STABLE { return m_text; }
    int instrCount() const override { return INSTR_COUNT_PLI; }
    bool same(const AstNode* samep) const override {
        return text() == static_cast<const AstSFormatF*>(samep)->text();
@@ -1616,7 +1738,7 @@ public:
        this->fromp(fromp);
    }
    ASTGEN_MEMBERS_AstSScanF;
-    string name() const override { return m_text; }
+    string name() const override VL_MT_STABLE { return m_text; }
    string verilogKwd() const override { return "$sscanf"; }
    string emitVerilog() override { V3ERROR_NA_RETURN(""); }
    string emitC() override { V3ERROR_NA_RETURN(""); }
@@ -1754,9 +1876,10 @@ class AstStable final : public AstNodeExpr {
    // @astgen op1 := exprp : AstNodeExpr
    // @astgen op2 := sentreep : Optional[AstSenTree]
 public:
-    AstStable(FileLine* fl, AstNodeExpr* exprp)
+    AstStable(FileLine* fl, AstNodeExpr* exprp, AstSenTree* sentreep)
        : ASTGEN_SUPER_Stable(fl) {
        this->exprp(exprp);
+        this->sentreep(sentreep);
    }
    ASTGEN_MEMBERS_AstStable;
    string emitVerilog() override { return "$stable(%l)"; }
@@ -1786,7 +1909,7 @@ public:
    bool same(const AstNode* /*samep*/) const override { return true; }
 };
 class AstStructSel final : public AstNodeExpr {
-    // Unpacked struct member access
+    // Unpacked struct/union member access
    // Parents: math|stmt
    // Children: varref, math
    // @astgen op1 := fromp : AstNodeExpr
@@ -1800,10 +1923,14 @@ public:
        dtypep(nullptr);  // V3Width will resolve
    }
    ASTGEN_MEMBERS_AstStructSel;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
+    void name(const string& name) override { m_name = name; }
    string emitVerilog() override { V3ERROR_NA_RETURN(""); }
    string emitC() override { V3ERROR_NA_RETURN(""); }
-    bool cleanOut() const override { return false; }
+    bool cleanOut() const override {
+        // Not a union
+        return VN_IS(fromp()->dtypep()->skipRefp(), StructDType);
+    }
    bool same(const AstNode* samep) const override {
        const AstStructSel* const sp = static_cast<const AstStructSel*>(samep);
        return m_name == sp->m_name;
@@ -1880,7 +2007,7 @@ public:
    bool same(const AstNode* /*samep*/) const override { return true; }
    bool cleanOut() const override { return true; }
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* subDTypep() const { return dtypep() ? dtypep() : childDTypep(); }
+    AstNodeDType* subDTypep() const VL_MT_STABLE { return dtypep() ? dtypep() : childDTypep(); }
 };
 class AstTimePrecision final : public AstNodeExpr {
    // Verilog $timeprecision
@@ -1996,14 +2123,14 @@ class AstWith final : public AstNodeExpr {
    // Children: expression (equation establishing the with)
    // @astgen op1 := indexArgRefp : AstLambdaArgRef
    // @astgen op2 := valueArgRefp : AstLambdaArgRef
-    // @astgen op3 := exprp : AstNodeExpr
+    // @astgen op3 := exprp : List[AstNode]
 public:
    AstWith(FileLine* fl, AstLambdaArgRef* indexArgRefp, AstLambdaArgRef* valueArgRefp,
            AstNodeExpr* exprp)
        : ASTGEN_SUPER_With(fl) {
        this->indexArgRefp(indexArgRefp);
        this->valueArgRefp(valueArgRefp);
-        this->exprp(exprp);
+        this->addExprp(exprp);
    }
    ASTGEN_MEMBERS_AstWith;
    bool same(const AstNode* /*samep*/) const override { return true; }
@@ -2108,7 +2235,7 @@ public:
    void numberOperate(V3Number& out, const V3Number& lhs, const V3Number& rhs) override {
        out.opCompareNN(lhs, rhs, m_ignoreCase);
    }
-    string name() const override { return m_ignoreCase ? "icompare" : "compare"; }
+    string name() const override VL_MT_STABLE { return m_ignoreCase ? "icompare" : "compare"; }
    string emitVerilog() override {
        return m_ignoreCase ? "%k(%l.icompare(%r))" : "%k(%l.compare(%r))";
    }
@@ -2313,6 +2440,7 @@ public:
    bool sizeMattersLhs() const override { return false; }
    bool sizeMattersRhs() const override { return false; }
    int instrCount() const override { return widthInstrs() * 64; }
+    bool isPredictOptimizable() const override { return false; }
    bool isPure() const override { return false; }  // SPECIAL: $display has 'visual' ordering
    AstNode* filep() const { return lhsp(); }
    AstNode* charp() const { return rhsp(); }
@@ -2331,7 +2459,7 @@ public:
    void numberOperate(V3Number& out, const V3Number& lhs, const V3Number& rhs) override {
        out.opGetcN(lhs, rhs);
    }
-    string name() const override { return "getc"; }
+    string name() const override VL_MT_STABLE { return "getc"; }
    string emitVerilog() override { return "%k(%l.getc(%r))"; }
    string emitC() override { return "VL_GETC_N(%li,%ri)"; }
    string emitSimpleOperator() override { return ""; }
@@ -3304,6 +3432,30 @@ public:
    int instrCount() const override { return INSTR_COUNT_STR; }
    bool stringFlavor() const override { return true; }
 };
+class AstEqT final : public AstNodeBiCom {
+    // Equal (==) for data types
+public:
+    AstEqT(FileLine* fl, AstNodeExpr* lhsp, AstNodeExpr* rhsp)
+        : ASTGEN_SUPER_EqT(fl, lhsp, rhsp) {
+        dtypeSetBit();
+    }
+    ASTGEN_MEMBERS_AstEqT;
+    AstNodeExpr* cloneType(AstNodeExpr* lhsp, AstNodeExpr* rhsp) override {
+        return new AstEqT{fileline(), lhsp, rhsp};
+    }
+    void numberOperate(V3Number& out, const V3Number& lhs, const V3Number& rhs) override {
+        V3ERROR_NA;
+    }
+    string emitVerilog() override { return "%k(%l %f== %r)"; }
+    string emitC() override { V3ERROR_NA_RETURN(""); }
+    string emitSimpleOperator() override { return "=="; }
+    bool cleanOut() const override { return true; }
+    bool cleanLhs() const override { return false; }
+    bool cleanRhs() const override { return false; }
+    bool sizeMattersLhs() const override { return false; }
+    bool sizeMattersRhs() const override { return false; }
+    int instrCount() const override { return INSTR_COUNT_STR; }
+};
 class AstLogEq final : public AstNodeBiCom {
 public:
    AstLogEq(FileLine* fl, AstNodeExpr* lhsp, AstNodeExpr* rhsp)
@@ -3419,6 +3571,30 @@ public:
    int instrCount() const override { return INSTR_COUNT_STR; }
    bool stringFlavor() const override { return true; }
 };
+class AstNeqT final : public AstNodeBiCom {
+    // Not-equal (!=) for data types
+public:
+    AstNeqT(FileLine* fl, AstNodeExpr* lhsp, AstNodeExpr* rhsp)
+        : ASTGEN_SUPER_NeqT(fl, lhsp, rhsp) {
+        dtypeSetBit();
+    }
+    ASTGEN_MEMBERS_AstNeqT;
+    AstNodeExpr* cloneType(AstNodeExpr* lhsp, AstNodeExpr* rhsp) override {
+        return new AstNeqT{fileline(), lhsp, rhsp};
+    }
+    void numberOperate(V3Number& out, const V3Number& lhs, const V3Number& rhs) override {
+        V3ERROR_NA;
+    }
+    string emitVerilog() override { return "%k(%l %f!= %r)"; }
+    string emitC() override { V3ERROR_NA_RETURN(""); }
+    string emitSimpleOperator() override { return "!="; }
+    bool cleanOut() const override { return true; }
+    bool cleanLhs() const override { return false; }
+    bool cleanRhs() const override { return false; }
+    bool sizeMattersLhs() const override { return false; }
+    bool sizeMattersRhs() const override { return false; }
+    int instrCount() const override { return INSTR_COUNT_STR; }
+};

 // === AstNodeBiComAsv ===
 class AstAdd final : public AstNodeBiComAsv {
@@ -3913,7 +4089,6 @@ public:
        BROKEN_RTN(!fromp());
        return nullptr;
    }
-    void dump(std::ostream& str) const override;
 };
 class AstNew final : public AstNodeFTaskRef {
    // New as constructor
@@ -4164,7 +4339,7 @@ public:
                       const V3Number& ths) override {
        out.opPutcN(lhs, rhs, ths);
    }
-    string name() const override { return "putc"; }
+    string name() const override VL_MT_STABLE { return "putc"; }
    string emitVerilog() override { return "%k(%l.putc(%r,%t))"; }
    string emitC() override { return "VL_PUTC_N(%li,%ri,%ti)"; }
    string emitSimpleOperator() override { return ""; }
@@ -4271,7 +4446,7 @@ public:
                       const V3Number& ths) override {
        out.opSubstrN(lhs, rhs, ths);
    }
-    string name() const override { return "substr"; }
+    string name() const override VL_MT_STABLE { return "substr"; }
    string emitVerilog() override { return "%k(%l.substr(%r,%t))"; }
    string emitC() override { return "VL_SUBSTR_N(%li,%ri,%ti)"; }
    string emitSimpleOperator() override { return ""; }
@@ -4348,15 +4523,15 @@ public:
    }
    ASTGEN_MEMBERS_AstAtoN;
    void numberOperate(V3Number& out, const V3Number& lhs) override { out.opAtoN(lhs, m_fmt); }
-    string name() const override {
+    string name() const override VL_MT_STABLE {
        switch (m_fmt) {
        case ATOI: return "atoi";
        case ATOHEX: return "atohex";
        case ATOOCT: return "atooct";
        case ATOBIN: return "atobin";
        case ATOREAL: return "atoreal";
-        default: V3ERROR_NA;
        }
+        V3ERROR_NA_RETURN("");
    }
    string emitVerilog() override { return "%l." + name() + "()"; }
    string emitC() override {
@@ -4366,8 +4541,8 @@ public:
        case ATOOCT: return "VL_ATOI_N(%li, 8)";
        case ATOBIN: return "VL_ATOI_N(%li, 2)";
        case ATOREAL: return "std::atof(%li.c_str())";
-        default: V3ERROR_NA;
        }
+        V3ERROR_NA_RETURN("");
    }
    bool cleanOut() const override { return true; }
    bool cleanLhs() const override { return true; }
@@ -4495,9 +4670,9 @@ public:
        dtypeSetString();
    }
    ASTGEN_MEMBERS_AstCvtPackString;
-    void numberOperate(V3Number& out, const V3Number& lhs) override { V3ERROR_NA; }
+    void numberOperate(V3Number& out, const V3Number& lhs) override { out.opAssign(lhs); }
    string emitVerilog() override { return "%f$_CAST(%l)"; }
-    string emitC() override { return "VL_CVT_PACK_STR_N%lq(%lW, %li)"; }
+    string emitC() override { V3ERROR_NA_RETURN(""); }
    bool cleanOut() const override { return true; }
    bool cleanLhs() const override { return true; }
    bool sizeMattersLhs() const override { return false; }
@@ -4559,6 +4734,7 @@ public:
    bool cleanLhs() const override { return true; }
    bool sizeMattersLhs() const override { return false; }
    int instrCount() const override { return widthInstrs() * 16; }
+    bool isPredictOptimizable() const override { return false; }
    bool isPure() const override { return false; }  // SPECIAL: $display has 'visual' ordering
    AstNode* filep() const { return lhsp(); }
 };
@@ -4575,6 +4751,7 @@ public:
    bool cleanLhs() const override { return true; }
    bool sizeMattersLhs() const override { return false; }
    int instrCount() const override { return widthInstrs() * 64; }
+    bool isPredictOptimizable() const override { return false; }
    bool isPure() const override { return false; }  // SPECIAL: $display has 'visual' ordering
    AstNode* filep() const { return lhsp(); }
 };
@@ -4674,6 +4851,21 @@ public:
    bool cleanLhs() const override { return true; }
    bool sizeMattersLhs() const override { return false; }
 };
+class AstNToI final : public AstNodeUniop {
+    // String to any-size integral
+public:
+    AstNToI(FileLine* fl, AstNodeExpr* lhsp, AstNodeDType* dtypep = nullptr)
+        : ASTGEN_SUPER_NToI(fl, lhsp) {
+        this->dtypep(dtypep);
+    }
+    ASTGEN_MEMBERS_AstNToI;
+    void numberOperate(V3Number& out, const V3Number& lhs) override { out.opNToI(lhs); }
+    string emitVerilog() override { return "'(%l)"; }
+    string emitC() override { return "VL_NTOI_%nq(%nw, %P, %li)"; }
+    bool cleanOut() const override { return true; }
+    bool cleanLhs() const override { return true; }
+    bool sizeMattersLhs() const override { return false; }
+};
 class AstNegate final : public AstNodeUniop {
 public:
    AstNegate(FileLine* fl, AstNodeExpr* lhsp)
@@ -5158,15 +5350,15 @@ public:
 class AstVarRef final : public AstNodeVarRef {
    // A reference to a variable (lvalue or rvalue)
 public:
-    AstVarRef(FileLine* fl, const string& name, const VAccess& access)
-        : ASTGEN_SUPER_VarRef(fl, name, nullptr, access) {}
    // This form only allowed post-link because output/wire compression may
    // lead to deletion of AstVar's
    inline AstVarRef(FileLine* fl, AstVar* varp, const VAccess& access);
    // This form only allowed post-link (see above)
    inline AstVarRef(FileLine* fl, AstVarScope* varscp, const VAccess& access);
    ASTGEN_MEMBERS_AstVarRef;
+    inline string name() const override;  // * = Var name
    void dump(std::ostream& str) const override;
+    const char* broken() const override;
    bool same(const AstNode* samep) const override;
    inline bool same(const AstVarRef* samep) const;
    inline bool sameNoLvalue(AstVarRef* samep) const;
@@ -5178,14 +5370,17 @@ public:
 class AstVarXRef final : public AstNodeVarRef {
    // A VarRef to something in another module before AstScope.
    // Includes pin on a cell, as part of a ASSIGN statement to connect I/Os until AstScope
+    string m_name;
    string m_dotted;  // Dotted part of scope the name()'ed reference is under or ""
    string m_inlinedDots;  // Dotted hierarchy flattened out
 public:
    AstVarXRef(FileLine* fl, const string& name, const string& dotted, const VAccess& access)
-        : ASTGEN_SUPER_VarXRef(fl, name, nullptr, access)
+        : ASTGEN_SUPER_VarXRef(fl, nullptr, access)
+        , m_name{name}
        , m_dotted{dotted} {}
    inline AstVarXRef(FileLine* fl, AstVar* varp, const string& dotted, const VAccess& access);
    ASTGEN_MEMBERS_AstVarXRef;
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Var name
    void dump(std::ostream& str) const override;
    string dotted() const { return m_dotted; }
    void dotted(const string& dotted) { m_dotted = dotted; }
@@ -48,7 +48,7 @@ protected:
 public:
    ASTGEN_MEMBERS_AstNodeBlock;
    void dump(std::ostream& str) const override;
-    string name() const override { return m_name; }  // * = Block name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Block name
    void name(const string& name) override { m_name = name; }
    bool unnamed() const { return m_unnamed; }
    bool isFirstInMyListOfStatements(AstNode* nodep) const override { return nodep == stmtsp(); }
@@ -86,6 +86,7 @@ private:
    bool m_recursive : 1;  // Recursive or part of recursion
    bool m_underGenerate : 1;  // Under generate (for warning)
    bool m_virtual : 1;  // Virtual method in class
+    bool m_needProcess : 1;  // Implements part of a process that allocates std::process
    VLifetime m_lifetime;  // Lifetime
 protected:
    AstNodeFTask(VNType t, FileLine* fl, const string& name, AstNode* stmtsp)
@@ -110,7 +111,8 @@ protected:
        , m_pureVirtual{false}
        , m_recursive{false}
        , m_underGenerate{false}
-        , m_virtual{false} {
+        , m_virtual{false}
+        , m_needProcess{false} {
        addStmtsp(stmtsp);
        cname(name);  // Might be overridden by dpi import/export
    }
@@ -118,7 +120,7 @@ protected:
 public:
    ASTGEN_MEMBERS_AstNodeFTask;
    void dump(std::ostream& str = std::cout) const override;
-    string name() const override { return m_name; }  // * = Var name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Var name
    bool maybePointedTo() const override { return true; }
    bool isGateOptimizable() const override { return !((m_dpiExport || m_dpiImport) && !m_pure); }
    // {AstFunc only} op1 = Range output variable
@@ -170,6 +172,8 @@ public:
    bool underGenerate() const { return m_underGenerate; }
    void isVirtual(bool flag) { m_virtual = flag; }
    bool isVirtual() const { return m_virtual; }
+    void setNeedProcess() { m_needProcess = true; }
+    bool needProcess() const { return m_needProcess; }
    void lifetime(const VLifetime& flag) { m_lifetime = flag; }
    VLifetime lifetime() const { return m_lifetime; }
    bool isFirstInMyListOfStatements(AstNode* n) const override { return n == stmtsp(); }
@@ -186,7 +190,7 @@ public:
        , m_name{name} {}
    ASTGEN_MEMBERS_AstNodeFile;
    void dump(std::ostream& str) const override;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    bool same(const AstNode* /*samep*/) const override { return true; }
 };
 class AstNodeModule VL_NOT_FINAL : public AstNode {
@@ -210,6 +214,7 @@ private:
    bool m_modTrace : 1;  // Tracing this module
    bool m_inLibrary : 1;  // From a library, no error if not used, never top level
    bool m_dead : 1;  // LinkDot believes is dead; will remove in Dead visitors
+    bool m_hasGParam : 1;  // Has global parameter (for link)
    bool m_hierBlock : 1;  // Hierarchical Block marked by HIER_BLOCK pragma
    bool m_internal : 1;  // Internally created
    bool m_recursive : 1;  // Recursive module
@@ -223,6 +228,7 @@ protected:
        , m_modTrace{false}
        , m_inLibrary{false}
        , m_dead{false}
+        , m_hasGParam{false}
        , m_hierBlock{false}
        , m_internal{false}
        , m_recursive{false}
@@ -232,7 +238,7 @@ public:
    ASTGEN_MEMBERS_AstNodeModule;
    void dump(std::ostream& str) const override;
    bool maybePointedTo() const override { return true; }
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    virtual bool timescaleMatters() const = 0;
    // ACCESSORS
    void name(const string& name) override { m_name = name; }
@@ -250,6 +256,8 @@ public:
    bool modTrace() const { return m_modTrace; }
    void dead(bool flag) { m_dead = flag; }
    bool dead() const { return m_dead; }
+    void hasGParam(bool flag) { m_hasGParam = flag; }
+    bool hasGParam() const { return m_hasGParam; }
    void hierBlock(bool flag) { m_hierBlock = flag; }
    bool hierBlock() const { return m_hierBlock; }
    void internal(bool flag) { m_internal = flag; }
@@ -268,10 +276,13 @@ public:
 class AstNodeProcedure VL_NOT_FINAL : public AstNode {
    // IEEE procedure: initial, final, always
    // @astgen op2 := stmtsp : List[AstNode] // Note: op1 is used in some sub-types only
-    bool m_suspendable = false;  // Is suspendable by a Delay, EventControl, etc.
+    bool m_suspendable : 1;  // Is suspendable by a Delay, EventControl, etc.
+    bool m_needProcess : 1;  // Implements part of a process that allocates std::process
 protected:
    AstNodeProcedure(VNType t, FileLine* fl, AstNode* stmtsp)
        : AstNode{t, fl} {
+        m_needProcess = false;
+        m_suspendable = false;
        addStmtsp(stmtsp);
    }

@@ -282,6 +293,8 @@ public:
    bool isJustOneBodyStmt() const { return stmtsp() && !stmtsp()->nextp(); }
    bool isSuspendable() const { return m_suspendable; }
    void setSuspendable() { m_suspendable = true; }
+    bool needProcess() const { return m_needProcess; }
+    void setNeedProcess() { m_needProcess = true; }
 };
 class AstNodeRange VL_NOT_FINAL : public AstNode {
    // A range, sized or unsized
@@ -304,8 +317,6 @@ public:
    // METHODS
    void addNextStmt(AstNode* newp,
                     AstNode* belowp) override;  // Stop statement searchback here
-    void addBeforeStmt(AstNode* newp,
-                       AstNode* belowp) override;  // Stop statement searchback here
    void dump(std::ostream& str = std::cout) const override;
 };
 class AstNodeAssign VL_NOT_FINAL : public AstNodeStmt {
@@ -369,7 +380,7 @@ public:
        this->addPasssp(passsp);
    }
    ASTGEN_MEMBERS_AstNodeCoverOrAssert;
-    string name() const override { return m_name; }  // * = Var name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Var name
    bool same(const AstNode* samep) const override { return samep->name() == name(); }
    void name(const string& name) override { m_name = name; }
    void dump(std::ostream& str = std::cout) const override;
@@ -508,7 +519,7 @@ public:
    }
    ASTGEN_MEMBERS_AstActive;
    void dump(std::ostream& str = std::cout) const override;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    const char* broken() const override;
    void cloneRelink() override;
    // Statements are broken into pieces, as some must come before others.
@@ -533,7 +544,7 @@ public:
    }
    ASTGEN_MEMBERS_AstBind;
    // ACCESSORS
-    string name() const override { return m_name; }  // * = Bind Target name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Bind Target name
    void name(const string& name) override { m_name = name; }
 };
 class AstCFunc final : public AstNode {
@@ -574,6 +585,7 @@ private:
    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
    bool m_dpiTraceInit : 1;  // DPI trace_init
+    bool m_needProcess : 1;  // Implements part of a process that allocates std::process
 public:
    AstCFunc(FileLine* fl, const string& name, AstScope* scopep, const string& rtnType = "")
        : ASTGEN_SUPER_CFunc(fl) {
@@ -593,6 +605,7 @@ public:
        m_isLoose = false;
        m_isInline = false;
        m_isVirtual = false;
+        m_needProcess = false;
        m_entryPoint = false;
        m_pure = false;
        m_dpiContext = false;
@@ -603,7 +616,7 @@ public:
        m_dpiTraceInit = false;
    }
    ASTGEN_MEMBERS_AstCFunc;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    const char* broken() const override;
    void cloneRelink() override;
    bool maybePointedTo() const override { return true; }
@@ -661,6 +674,8 @@ public:
    void isInline(bool flag) { m_isInline = flag; }
    bool isVirtual() const { return m_isVirtual; }
    void isVirtual(bool flag) { m_isVirtual = flag; }
+    bool needProcess() const { return m_needProcess; }
+    void setNeedProcess() { m_needProcess = true; }
    bool entryPoint() const { return m_entryPoint; }
    void entryPoint(bool flag) { m_entryPoint = flag; }
    bool pure() const { return m_pure; }
@@ -698,7 +713,7 @@ public:
        , m_useType{useType} {}
    ASTGEN_MEMBERS_AstCUse;
    void dump(std::ostream& str = std::cout) const override;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    VUseType useType() const { return m_useType; }
 };
 class AstCaseItem final : public AstNode {
@@ -751,7 +766,7 @@ public:
    const char* broken() const override;
    bool maybePointedTo() const override { return true; }
    // ACCESSORS
-    string name() const override { return m_name; }  // * = Cell name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Cell name
    void name(const string& name) override { m_name = name; }
    string origName() const override { return m_origName; }  // * = Original name
    void origName(const string& name) { m_origName = name; }
@@ -790,7 +805,7 @@ public:
    void dump(std::ostream& str) const override;
    const char* broken() const override;
    // ACCESSORS
-    string name() const override { return m_name; }  // * = Cell name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Cell name
    string origModName() const { return m_origModName; }  // * = modp()->origName() before inlining
    void name(const string& name) override { m_name = name; }
    void scopep(AstScope* scp) { m_scopep = scp; }
@@ -799,19 +814,30 @@ public:
    VTimescale timeunit() const { return m_timeunit; }
 };
 class AstClassExtends final : public AstNode {
+    // class extends class name, or class implements class name
    // Children: List of AstParseRef for packages/classes
    // during early parse, then moves to dtype
    // @astgen op1 := childDTypep : Optional[AstNodeDType]
    // @astgen op2 := classOrPkgsp : Optional[AstNode]
+    const bool m_isImplements = false;  // class implements
+    bool m_parameterized = false;  // has parameters in its statement
+
 public:
-    AstClassExtends(FileLine* fl, AstNode* classOrPkgsp)
-        : ASTGEN_SUPER_ClassExtends(fl) {
+    AstClassExtends(FileLine* fl, AstNode* classOrPkgsp, bool isImplements)
+        : ASTGEN_SUPER_ClassExtends(fl)
+        , m_isImplements{isImplements} {
        this->classOrPkgsp(classOrPkgsp);  // Only for parser
    }
    ASTGEN_MEMBERS_AstClassExtends;
+    void dump(std::ostream& str) const override;
    bool hasDType() const override { return true; }
-    string verilogKwd() const override { return "extends"; }
-    AstClass* classp() const;  // Class being extended (after link)
+    string verilogKwd() const override { return isImplements() ? "implements" : "extends"; }
+    // Class being extended (after link and instantiation if needed)
+    AstClass* classOrNullp() const;
+    AstClass* classp() const;  // Like above, but throws error if nulll
+    bool isImplements() const { return m_isImplements; }
+    void parameterized(bool flag) { m_parameterized = flag; }
+    bool parameterized() const { return m_parameterized; }
 };
 class AstClocking final : public AstNode {
    // Parents:  MODULE
@@ -822,19 +848,23 @@ class AstClocking final : public AstNode {
    // @astgen op4 := eventp : Optional[AstVar]
    std::string m_name;  // Clocking block name
    const bool m_isDefault = false;  // True if default clocking
+    const bool m_isGlobal = false;  // True if global clocking

 public:
    AstClocking(FileLine* fl, const std::string& name, AstSenItem* sensesp,
-                AstClockingItem* itemsp, bool isDefault)
+                AstClockingItem* itemsp, bool isDefault, bool isGlobal)
        : ASTGEN_SUPER_Clocking(fl)
-        , m_isDefault{isDefault} {
+        , m_isDefault{isDefault}
+        , m_isGlobal{isGlobal} {
        m_name = name;
        this->sensesp(sensesp);
        addItemsp(itemsp);
    }
    ASTGEN_MEMBERS_AstClocking;
-    std::string name() const override { return m_name; }
+    void dump(std::ostream& str) const override;
+    std::string name() const override VL_MT_STABLE { return m_name; }
    bool isDefault() const { return m_isDefault; }
+    bool isGlobal() const { return m_isGlobal; }
 };
 class AstClockingItem final : public AstNode {
    // Parents:  CLOCKING
@@ -850,8 +880,8 @@ public:
        : ASTGEN_SUPER_ClockingItem(fl) {
        m_direction = direction;
        this->skewp(skewp);
-        if (AstAssign* const assignp = VN_CAST(clockingDeclp, Assign)) {
-            this->assignp(assignp);
+        if (AstAssign* const clkAssignp = VN_CAST(clockingDeclp, Assign)) {
+            this->assignp(clkAssignp);
        } else {
            exprp(VN_AS(clockingDeclp, NodeExpr));
        }
@@ -903,7 +933,7 @@ public:
        , m_path{path} {
        this->rhsp(rhsp);
    }
-    string name() const override { return m_name; }  // * = Scope name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Scope name
    ASTGEN_MEMBERS_AstDefParam;
    bool same(const AstNode*) const override { return true; }
    string path() const { return m_path; }
@@ -921,7 +951,7 @@ public:
        , m_name{vname}
        , m_cname{cname} {}
    ASTGEN_MEMBERS_AstDpiExport;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    void name(const string& name) override { m_name = name; }
    string cname() const { return m_cname; }
    void cname(const string& cname) { m_cname = cname; }
@@ -939,7 +969,7 @@ public:
        BROKEN_RTN(!fmtp());
        return nullptr;
    }
-    string verilogKwd() const override { return (string("$") + string(displayType().ascii())); }
+    string verilogKwd() const override { return string{"$"} + string{displayType().ascii()}; }
    bool isGateOptimizable() const override { return false; }
    bool isPredictOptimizable() const override { return false; }
    bool isPure() const override { return false; }  // SPECIAL: $display has 'visual' ordering
@@ -982,7 +1012,7 @@ public:
        BROKEN_RTN(!m_depGraphp);
        return nullptr;
    }
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    V3Graph* depGraphp() { return m_depGraphp; }
    const V3Graph* depGraphp() const { return m_depGraphp; }
 };
@@ -1020,7 +1050,7 @@ public:
    AstIntfRef(FileLine* fl, const string& name)
        : ASTGEN_SUPER_IntfRef(fl)
        , m_name{name} {}
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    ASTGEN_MEMBERS_AstIntfRef;
 };
 class AstMTaskBody final : public AstNode {
@@ -1057,7 +1087,7 @@ public:
        , m_name{name} {
        this->addVarsp(varsp);
    }
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    bool maybePointedTo() const override { return true; }
    ASTGEN_MEMBERS_AstModport;
 };
@@ -1079,7 +1109,7 @@ public:
    const char* broken() const override;
    void cloneRelink() override;
    void dump(std::ostream& str) const override;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    bool isImport() const { return !m_export; }
    bool isExport() const { return m_export; }
    AstNodeFTask* ftaskp() const { return m_ftaskp; }  // [After Link] Pointer to variable
@@ -1102,7 +1132,7 @@ public:
    const char* broken() const override;
    void cloneRelink() override;
    void dump(std::ostream& str) const override;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    void direction(const VDirection& flag) { m_direction = flag; }
    VDirection direction() const { return m_direction; }
    AstVar* varp() const { return m_varp; }  // [After Link] Pointer to variable
@@ -1136,9 +1166,9 @@ public:
    ASTGEN_MEMBERS_AstNetlist;
    const char* broken() const override;
    void cloneRelink() override { V3ERROR_NA; }
-    string name() const override { return "$root"; }
+    string name() const override VL_MT_STABLE { return "$root"; }
    void dump(std::ostream& str) const override;
-    AstNodeModule* topModulep() const {  // Top module in hierarchy
+    AstNodeModule* topModulep() const VL_MT_STABLE {  // Top module in hierarchy
        return modulesp();  // First one in the list, for now
    }
    AstTypeTable* typeTablep() { return m_typeTablep; }
@@ -1185,7 +1215,7 @@ public:
    const char* broken() const override;
    void cloneRelink() override;
    void dump(std::ostream& str) const override;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    AstPackage* packagep() const { return m_packagep; }
    void packagep(AstPackage* nodep) { m_packagep = nodep; }
 };
@@ -1211,7 +1241,7 @@ public:
    const char* broken() const override;
    void cloneRelink() override;
    void dump(std::ostream& str) const override;
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    AstPackage* packagep() const { return m_packagep; }
    void packagep(AstPackage* nodep) { m_packagep = nodep; }
 };
@@ -1224,7 +1254,8 @@ private:
    AstVar* m_modVarp = nullptr;  // Input/output this pin connects to on submodule.
    AstParamTypeDType* m_modPTypep = nullptr;  // Param type this pin connects to on submodule.
    bool m_param = false;  // Pin connects to parameter
-    bool m_svImplicit = false;  // Pin is SystemVerilog .name'ed
+    bool m_svDotName = false;  // Pin is SystemVerilog .name'ed
+    bool m_svImplicit = false;  // Pin is SystemVerilog .name'ed, allow implicit
 public:
    AstPin(FileLine* fl, int pinNum, const string& name, AstNode* exprp)
        : ASTGEN_SUPER_Pin(fl)
@@ -1236,7 +1267,7 @@ public:
    ASTGEN_MEMBERS_AstPin;
    void dump(std::ostream& str) const override;
    const char* broken() const override;
-    string name() const override { return m_name; }  // * = Pin name, ""=go by number
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Pin name, ""=go by number
    void name(const string& name) override { m_name = name; }
    string prettyOperatorName() const override;
    bool dotStar() const { return name() == ".*"; }  // Fake name for .* connections until linked
@@ -1248,6 +1279,8 @@ public:
    void modPTypep(AstParamTypeDType* nodep) { m_modPTypep = nodep; }
    bool param() const { return m_param; }
    void param(bool flag) { m_param = flag; }
+    bool svDotName() const { return m_svDotName; }
+    void svDotName(bool flag) { m_svDotName = flag; }
    bool svImplicit() const { return m_svImplicit; }
    void svImplicit(bool flag) { m_svImplicit = flag; }
 };
@@ -1262,7 +1295,7 @@ public:
        , m_pinNum{pinnum}
        , m_name{name} {}
    ASTGEN_MEMBERS_AstPort;
-    string name() const override { return m_name; }  // * = Port name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Port name
    int pinNum() const { return m_pinNum; }  // * = Pin number, for order based instantiation
 };
 class AstPragma final : public AstNode {
@@ -1340,11 +1373,12 @@ public:
    void cloneRelink() override;
    const char* broken() const override;
    bool maybePointedTo() const override { return true; }
-    string name() const override { return m_name; }  // * = Scope name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Scope name
    void name(const string& name) override { m_name = name; }
    void dump(std::ostream& str) const override;
+    bool same(const AstNode* samep) const override;
    string nameDotless() const;
-    string nameVlSym() const { return ((string("vlSymsp->")) + nameDotless()); }
+    string nameVlSym() const { return string{"vlSymsp->"} + nameDotless(); }
    AstNodeModule* modp() const { return m_modp; }
    //
    AstScope* aboveScopep() const VL_MT_SAFE { return m_aboveScopep; }
@@ -1479,6 +1513,7 @@ class AstTypeTable final : public AstNode {
    AstEmptyQueueDType* m_emptyQueuep = nullptr;
    AstQueueDType* m_queueIndexp = nullptr;
    AstVoidDType* m_voidp = nullptr;
+    AstStreamDType* m_streamp = nullptr;
    AstBasicDType* m_basicps[VBasicDTypeKwd::_ENUM_MAX]{};
    //
    using DetailedMap = std::map<VBasicTypeKey, AstBasicDType*>;
@@ -1504,6 +1539,7 @@ public:
    AstEmptyQueueDType* findEmptyQueueDType(FileLine* fl);
    AstQueueDType* findQueueIndexDType(FileLine* fl);
    AstVoidDType* findVoidDType(FileLine* fl);
+    AstStreamDType* findStreamDType(FileLine* fl);
    void clearCache();
    void repairCache();
    void dump(std::ostream& str = std::cout) const override;
@@ -1528,9 +1564,11 @@ public:
    ASTGEN_MEMBERS_AstTypedef;
    void dump(std::ostream& str) const override;
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    virtual AstNodeDType* subDTypep() const { return dtypep() ? dtypep() : childDTypep(); }
+    virtual AstNodeDType* subDTypep() const VL_MT_STABLE {
+        return dtypep() ? dtypep() : childDTypep();
+    }
    // METHODS
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    bool maybePointedTo() const override { return true; }
    bool hasDType() const override { return true; }
    void name(const string& flag) override { m_name = flag; }
@@ -1550,7 +1588,7 @@ public:
        , m_name{name} {}
    ASTGEN_MEMBERS_AstTypedefFwd;
    // METHODS
-    string name() const override { return m_name; }
+    string name() const override VL_MT_STABLE { return m_name; }
    bool maybePointedTo() const override { return true; }
 };
 class AstUdpTable final : public AstNode {
@@ -1570,7 +1608,7 @@ public:
        : ASTGEN_SUPER_UdpTableLine(fl)
        , m_text{text} {}
    ASTGEN_MEMBERS_AstUdpTableLine;
-    string name() const override { return m_text; }
+    string name() const override VL_MT_STABLE { return m_text; }
    string text() const { return m_text; }
 };
 class AstVar final : public AstNode {
@@ -1610,6 +1648,7 @@ class AstVar final : public AstNode {
    bool m_usedLoopIdx : 1;  // Variable subject of for unrolling
    bool m_usedVirtIface : 1;  // Signal used through a virtual interface
    bool m_funcLocal : 1;  // Local variable for a function
+    bool m_funcLocalSticky : 1;  // As m_funcLocal but remains set if var is moved to a static
    bool m_funcReturn : 1;  // Return variable for a function
    bool m_attrScBv : 1;  // User force bit vector attribute
    bool m_attrIsolateAssign : 1;  // User isolate_assignments attribute
@@ -1653,6 +1692,7 @@ class AstVar final : public AstNode {
        m_sigUserRdPublic = false;
        m_sigUserRWPublic = false;
        m_funcLocal = false;
+        m_funcLocalSticky = false;
        m_funcReturn = false;
        m_attrScBv = false;
        m_attrIsolateAssign = false;
@@ -1740,7 +1780,8 @@ public:
    }
    ASTGEN_MEMBERS_AstVar;
    void dump(std::ostream& str) const override;
-    string name() const override VL_MT_SAFE { return m_name; }  // * = Var name
+    bool same(const AstNode* samep) const override;
+    string name() const override VL_MT_STABLE VL_MT_SAFE { return m_name; }  // * = Var name
    bool hasDType() const override { return true; }
    bool maybePointedTo() const override { return true; }
    string origName() const override { return m_origName; }  // * = Original name
@@ -1771,17 +1812,17 @@ public:
    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 = "",
-                     bool asRef = false) const VL_MT_SAFE;
+                     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
    void combineType(VVarType type);
    AstNodeDType* getChildDTypep() const override { return childDTypep(); }
-    AstNodeDType* dtypeSkipRefp() const VL_MT_SAFE { return subDTypep()->skipRefp(); }
+    AstNodeDType* dtypeSkipRefp() const VL_MT_STABLE { return subDTypep()->skipRefp(); }
    // (Slow) recurse down to find basic data type (Note don't need virtual -
    // AstVar isn't a NodeDType)
-    AstBasicDType* basicp() const VL_MT_SAFE { return subDTypep()->basicp(); }
-    virtual AstNodeDType* subDTypep() const VL_MT_SAFE {
+    AstBasicDType* basicp() const VL_MT_STABLE { return subDTypep()->basicp(); }
+    virtual AstNodeDType* subDTypep() const VL_MT_STABLE {
        return dtypep() ? dtypep() : childDTypep();
    }
    void ansi(bool flag) { m_ansi = flag; }
@@ -1815,7 +1856,10 @@ public:
    void isContinuously(bool flag) { m_isContinuously = flag; }
    void isStatic(bool flag) { m_isStatic = flag; }
    void isIfaceParent(bool flag) { m_isIfaceParent = flag; }
-    void funcLocal(bool flag) { m_funcLocal = flag; }
+    void funcLocal(bool flag) {
+        m_funcLocal = flag;
+        if (flag) m_funcLocalSticky = true;
+    }
    void funcReturn(bool flag) { m_funcReturn = flag; }
    void hasStrengthAssignment(bool flag) { m_hasStrengthAssignment = flag; }
    bool hasStrengthAssignment() { return m_hasStrengthAssignment; }
@@ -1897,6 +1941,7 @@ public:
    bool isStatic() const VL_MT_SAFE { return m_isStatic; }
    bool isLatched() const { return m_isLatched; }
    bool isFuncLocal() const { return m_funcLocal; }
+    bool isFuncLocalSticky() const { return m_funcLocalSticky; }
    bool isFuncReturn() const { return m_funcReturn; }
    bool isPullup() const { return m_isPullup; }
    bool isPulldown() const { return m_isPulldown; }
@@ -1980,11 +2025,12 @@ public:
        return nullptr;
    }
    bool maybePointedTo() const override { return true; }
-    string name() const override { return scopep()->name() + "->" + varp()->name(); }
+    string name() const override VL_MT_STABLE { return scopep()->name() + "->" + varp()->name(); }
    void dump(std::ostream& str) const override;
+    bool same(const AstNode* samep) const override;
    bool hasDType() const override { return true; }
-    AstVar* varp() const { return m_varp; }  // [After Link] Pointer to variable
-    AstScope* scopep() const { return m_scopep; }  // Pointer to scope it's under
+    AstVar* varp() const VL_MT_STABLE { return m_varp; }  // [After Link] Pointer to variable
+    AstScope* scopep() const VL_MT_STABLE { return m_scopep; }  // Pointer to scope it's under
    void scopep(AstScope* nodep) { m_scopep = nodep; }
    bool isTrace() const { return m_trace; }
    void trace(bool flag) { m_trace = flag; }
@@ -2090,15 +2136,14 @@ public:

 // === AstNodeModule ===
 class AstClass final : public AstNodeModule {
-    // @astgen op4 := extendsp : Optional[AstClassExtends]
-    // TYPES
-    using MemberNameMap = std::map<const std::string, AstNode*>;
+    // @astgen op4 := extendsp : List[AstClassExtends]
    // MEMBERS
-    MemberNameMap m_members;  // Members or method children
-    AstClassPackage* m_classOrPackagep = nullptr;  // Class package this is under
-    bool m_virtual = false;  // Virtual class
+    AstClassPackage* m_classOrPackagep = nullptr;  // Package it will be emitted with
    bool m_extended = false;  // Is extension or extended by other classes
-    void insertCache(AstNode* nodep);
+    bool m_interfaceClass = false;  // Interface class
+    bool m_needRNG = false;  // Need RNG, uses srandom/randomize
+    bool m_virtual = false;  // Virtual class
+    bool m_parameterized = false;  // Parameterized class

 public:
    AstClass(FileLine* fl, const string& name)
@@ -2113,23 +2158,23 @@ public:
    AstClassPackage* classOrPackagep() const VL_MT_SAFE { return m_classOrPackagep; }
    void classOrPackagep(AstClassPackage* classpackagep) { m_classOrPackagep = classpackagep; }
    AstNode* membersp() const { return stmtsp(); }
-    void addMembersp(AstNode* nodep) {
-        insertCache(nodep);
-        addStmtsp(nodep);
-    }
-    void clearCache() { m_members.clear(); }
-    void repairCache();
-    AstNode* findMember(const string& name) const {
-        const auto it = m_members.find(name);
-        return (it == m_members.end()) ? nullptr : it->second;
-    }
+    void addMembersp(AstNode* nodep) { addStmtsp(nodep); }
    bool isExtended() const { return m_extended; }
    void isExtended(bool flag) { m_extended = flag; }
+    bool isInterfaceClass() const { return m_interfaceClass; }
+    void isInterfaceClass(bool flag) { m_interfaceClass = flag; }
    bool isVirtual() const { return m_virtual; }
    void isVirtual(bool flag) { m_virtual = flag; }
+    bool needRNG() const { return m_needRNG; }
+    void needRNG(bool flag) { m_needRNG = flag; }
+    bool isParameterized() const { return m_parameterized; }
+    void isParameterized(bool flag) { m_parameterized = flag; }
    // Return true if this class is an extension of base class (SLOW)
    // Accepts nullptrs
    static bool isClassExtendedFrom(const AstClass* refClassp, const AstClass* baseClassp);
+    // Return the lowest class extended from, or this class
+    AstClass* baseMostClassp();
+    static bool isCacheableChild(const AstNode* nodep);
 };
 class AstClassPackage final : public AstNodeModule {
    // The static information portion of a class (treated similarly to a package)
@@ -2315,20 +2360,20 @@ public:
    inline AstRange(FileLine* fl, int left, int right);
    inline AstRange(FileLine* fl, const VNumRange& range);
    ASTGEN_MEMBERS_AstRange;
-    inline int leftConst() const VL_MT_SAFE;
-    inline int rightConst() const VL_MT_SAFE;
-    int hiConst() const VL_MT_SAFE {
+    inline int leftConst() const VL_MT_STABLE;
+    inline int rightConst() const VL_MT_STABLE;
+    int hiConst() const VL_MT_STABLE {
        const int l = leftConst();
        const int r = rightConst();
        return l > r ? l : r;
    }
-    int loConst() const VL_MT_SAFE {
+    int loConst() const VL_MT_STABLE {
        const int l = leftConst();
        const int r = rightConst();
        return l > r ? r : l;
    }
-    int elementsConst() const VL_MT_SAFE { return hiConst() - loConst() + 1; }
-    bool littleEndian() const { return leftConst() < rightConst(); }
+    int elementsConst() const VL_MT_STABLE { return hiConst() - loConst() + 1; }
+    bool ascending() const { return leftConst() < rightConst(); }
    void dump(std::ostream& str) const override;
    virtual string emitC() { V3ERROR_NA_RETURN(""); }
    bool same(const AstNode* /*samep*/) const override { return true; }
@@ -2431,7 +2476,7 @@ public:
        , m_name{name}
        , m_showAt{showAt} {}
    ASTGEN_MEMBERS_AstComment;
-    string name() const override { return m_name; }  // * = Text
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Text
    bool same(const AstNode* samep) const override { return true; }  // Ignore name in comments
    virtual bool showAt() const { return m_showAt; }
 };
@@ -2572,7 +2617,7 @@ public:
        : ASTGEN_SUPER_Disable(fl)
        , m_name{name} {}
    ASTGEN_MEMBERS_AstDisable;
-    string name() const override { return m_name; }  // * = Block name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Block name
    void name(const string& flag) override { m_name = flag; }
    bool isBrancher() const override {
        return true;  // SPECIAL: We don't process code after breaks
@@ -2614,8 +2659,8 @@ public:
        return nullptr;
    }
    string verilogKwd() const override {
-        return (filep() ? string("$f") + string(displayType().ascii())
-                        : string("$") + string(displayType().ascii()));
+        return (filep() ? string{"$f"} + string{displayType().ascii()}
+                        : string{"$"} + string{displayType().ascii()});
    }
    bool isGateOptimizable() const override { return false; }
    bool isPredictOptimizable() const override { return false; }
@@ -2632,17 +2677,13 @@ public:
    bool addNewline() const { return displayType().addNewline(); }
 };
 class AstDoWhile final : public AstNodeStmt {
-    // @astgen op1 := precondsp : List[AstNode]
-    // @astgen op2 := condp : AstNodeExpr
-    // @astgen op3 := stmtsp : List[AstNode]
-    // @astgen op4 := incsp : List[AstNode]
+    // @astgen op1 := condp : AstNodeExpr
+    // @astgen op2 := stmtsp : List[AstNode]
 public:
-    AstDoWhile(FileLine* fl, AstNodeExpr* conditionp, AstNode* stmtsp = nullptr,
-               AstNode* incsp = nullptr)
+    AstDoWhile(FileLine* fl, AstNodeExpr* conditionp, AstNode* stmtsp = nullptr)
        : ASTGEN_SUPER_DoWhile(fl) {
        condp(conditionp);
        addStmtsp(stmtsp);
-        addIncsp(incsp);
    }
    ASTGEN_MEMBERS_AstDoWhile;
    bool isGateOptimizable() const override { return false; }
@@ -2720,46 +2761,6 @@ public:
    bool isUnlikely() const override { return true; }
    bool same(const AstNode* /*samep*/) const override { return true; }
 };
-class AstFOpen final : public AstNodeStmt {
-    // Although a system function in IEEE, here a statement which sets the file pointer (MCD)
-    // @astgen op1 := filep : AstNodeExpr
-    // @astgen op2 := filenamep : AstNodeExpr
-    // @astgen op3 := modep : AstNodeExpr
-public:
-    AstFOpen(FileLine* fl, AstNodeExpr* filep, AstNodeExpr* filenamep, AstNodeExpr* modep)
-        : ASTGEN_SUPER_FOpen(fl) {
-        this->filep(filep);
-        this->filenamep(filenamep);
-        this->modep(modep);
-    }
-    ASTGEN_MEMBERS_AstFOpen;
-    string verilogKwd() const override { return "$fopen"; }
-    bool isGateOptimizable() const override { return false; }
-    bool isPredictOptimizable() const override { return false; }
-    bool isPure() const override { return false; }
-    bool isOutputter() const override { return true; }
-    bool isUnlikely() const override { return true; }
-    bool same(const AstNode* /*samep*/) const override { return true; }
-};
-class AstFOpenMcd final : public AstNodeStmt {
-    // Although a system function in IEEE, here a statement which sets the file pointer (MCD)
-    // @astgen op1 := filep : AstNodeExpr
-    // @astgen op2 := filenamep : AstNodeExpr
-public:
-    AstFOpenMcd(FileLine* fl, AstNodeExpr* filep, AstNodeExpr* filenamep)
-        : ASTGEN_SUPER_FOpenMcd(fl) {
-        this->filep(filep);
-        this->filenamep(filenamep);
-    }
-    ASTGEN_MEMBERS_AstFOpenMcd;
-    string verilogKwd() const override { return "$fopen"; }
-    bool isGateOptimizable() const override { return false; }
-    bool isPredictOptimizable() const override { return false; }
-    bool isPure() const override { return false; }
-    bool isOutputter() const override { return true; }
-    bool isUnlikely() const override { return true; }
-    bool same(const AstNode* /*samep*/) const override { return true; }
-};
 class AstFinish final : public AstNodeStmt {
 public:
    explicit AstFinish(FileLine* fl)
@@ -2802,7 +2803,7 @@ public:
    bool isFirstInMyListOfStatements(AstNode* n) const override { return n == stmtsp(); }
 };
 class AstJumpBlock final : public AstNodeStmt {
-    // Block of code including a JumpGo and JumpLabel
+    // Block of code including a single JumpLabel, and 0+ JumpGo's to that label
    // Parents:  {statement list}
    // Children: {statement list, with JumpGo and JumpLabel below}
    // @astgen op1 := stmtsp : List[AstNode]
@@ -2907,7 +2908,7 @@ public:
        : ASTGEN_SUPER_PrintTimeScale(fl) {}
    ASTGEN_MEMBERS_AstPrintTimeScale;
    void name(const string& name) override { m_name = name; }
-    string name() const override { return m_name; }  // * = Var name
+    string name() const override VL_MT_STABLE { return m_name; }  // * = Var name
    void dump(std::ostream& str) const override;
    string verilogKwd() const override { return "$printtimescale"; }
    bool isGateOptimizable() const override { return false; }
@@ -3126,7 +3127,7 @@ public:
    void dump(std::ostream& str) const override;
    int instrCount() const override { return 100; }  // Large...
    ASTGEN_MEMBERS_AstTraceDecl;
-    string name() const override { return m_showname; }
+    string name() const override VL_MT_STABLE { return m_showname; }
    bool maybePointedTo() const override { return true; }
    bool hasDType() const override { return true; }
    bool same(const AstNode* samep) const override { return false; }
@@ -3255,8 +3256,6 @@ public:
    int instrCount() const override { return INSTR_COUNT_BRANCH; }
    bool same(const AstNode* /*samep*/) const override { return true; }
    // Stop statement searchback here
-    void addBeforeStmt(AstNode* newp, AstNode* belowp) override;
-    // Stop statement searchback here
    void addNextStmt(AstNode* newp, AstNode* belowp) override;
    bool isFirstInMyListOfStatements(AstNode* n) const override { return n == stmtsp(); }
 };
@@ -60,6 +60,12 @@ void AstNodeFTaskRef::cloneRelink() {
    }
 }

+bool AstNodeFTaskRef::isPure() const {
+    // TODO: For non-DPI functions we could traverse the AST of function's body to determine
+    // pureness.
+    return this->taskp() && this->taskp()->dpiImport() && this->taskp()->pure();
+}
+
 bool AstNodeFTaskRef::isGateOptimizable() const { return m_taskp && m_taskp->isGateOptimizable(); }

 const char* AstNodeVarRef::broken() const {
@@ -97,28 +103,8 @@ int AstNodeSel::bitConst() const {
    return (constp ? constp->toSInt() : 0);
 }

-void AstNodeUOrStructDType::repairMemberCache() {
-    clearCache();
-    for (AstMemberDType* itemp = membersp(); itemp; itemp = VN_AS(itemp->nextp(), MemberDType)) {
-        if (m_members.find(itemp->name()) != m_members.end()) {
-            itemp->v3error("Duplicate declaration of member name: " << itemp->prettyNameQ());
-        } else {
-            m_members.emplace(itemp->name(), itemp);
-        }
-    }
-}
-
 const char* AstNodeUOrStructDType::broken() const {
-    std::unordered_set<AstMemberDType*> exists;
-    for (AstMemberDType* itemp = membersp(); itemp; itemp = VN_AS(itemp->nextp(), MemberDType)) {
-        exists.insert(itemp);
-    }
-    for (MemberNameMap::const_iterator it = m_members.begin(); it != m_members.end(); ++it) {
-        if (VL_UNCOVERABLE(exists.find(it->second) == exists.end())) {
-            this->v3error("Internal: Structure member broken: " << it->first);
-            return "member broken";
-        }
-    }
+    BROKEN_RTN(m_classOrPackagep && !m_classOrPackagep->brokeExists());
    return nullptr;
 }

@@ -226,6 +212,15 @@ int AstBasicDType::widthTotalBytes() const {
    }
 }

+bool AstBasicDType::same(const AstNode* samep) const {
+    const AstBasicDType* const sp = static_cast<const AstBasicDType*>(samep);
+    if (!rangep() && !sp->rangep() && m == sp->m) {
+        return true;
+    } else {
+        return m == sp->m && rangep() && rangep()->sameTree(sp->rangep());
+    }
+}
+
 int AstNodeUOrStructDType::widthTotalBytes() const {
    if (width() <= 8) {
        return 1;
@@ -375,13 +370,15 @@ string AstVar::verilogKwd() const {
        return "wreal";
    } else if (varType() == VVarType::IFACEREF) {
        return "ifaceref";
-    } else {
+    } else if (dtypep()) {
        return dtypep()->name();
+    } else {
+        return "UNKNOWN";
    }
 }

 string AstVar::vlArgType(bool named, bool forReturn, bool forFunc, const string& namespc,
-                         bool asRef) const VL_MT_SAFE {
+                         bool asRef) const {
    UASSERT_OBJ(!forReturn, this,
                "Internal data is never passed as return, but as first argument");
    string ostatic;
@@ -567,7 +564,7 @@ string AstVar::dpiArgType(bool named, bool forReturn) const {
    } else {
        class converter final : public dpiTypesToStringConverter {
            string bitLogicVector(const AstVar* varp, bool isBit) const override {
-                return string(varp->isReadOnly() ? "const " : "")
+                return string{varp->isReadOnly() ? "const " : ""}
                       + dpiTypesToStringConverter::bitLogicVector(varp, isBit) + '*';
            }
            string primitive(const AstVar* varp) const override {
@@ -630,13 +627,13 @@ string AstVar::dpiTmpVarType(const string& varName) const {

 string AstVar::scType() const {
    if (isScBigUint()) {
-        return (string("sc_biguint<") + cvtToStr(widthMin())
+        return (string{"sc_biguint<"} + cvtToStr(widthMin())
                + "> ");  // Keep the space so don't get >>
    } else if (isScUint()) {
-        return (string("sc_uint<") + cvtToStr(widthMin())
+        return (string{"sc_uint<"} + cvtToStr(widthMin())
                + "> ");  // Keep the space so don't get >>
    } else if (isScBv()) {
-        return (string("sc_bv<") + cvtToStr(widthMin()) + "> ");  // Keep the space so don't get >>
+        return (string{"sc_bv<"} + cvtToStr(widthMin()) + "> ");  // Keep the space so don't get >>
    } else if (widthMin() == 1) {
        return "bool";
    } else if (widthMin() <= VL_IDATASIZE) {
@@ -675,7 +672,7 @@ AstVar* AstVar::scVarRecurse(AstNode* nodep) {
    return nullptr;
 }

-bool AstNodeDType::isFourstate() const { return basicp()->isFourstate(); }
+bool AstNodeDType::isFourstate() const { return basicp() && basicp()->isFourstate(); }

 class AstNodeDType::CTypeRecursed final {
 public:
@@ -698,7 +695,7 @@ public:
    }
 };

-string AstNodeDType::cType(const string& name, bool /*forFunc*/, bool isRef) const VL_MT_SAFE {
+string AstNodeDType::cType(const string& name, bool /*forFunc*/, bool isRef) const {
    const CTypeRecursed info = cTypeRecurse(false);
    return info.render(name, isRef);
 }
@@ -728,18 +725,18 @@ AstNodeDType::CTypeRecursed AstNodeDType::cTypeRecurse(bool compound) const {
        const CTypeRecursed sub = adtypep->subDTypep()->cTypeRecurse(true);
        info.m_type = "VlSampleQueue<" + sub.m_type + ">";
    } else if (const auto* const adtypep = VN_CAST(dtypep, ClassRefDType)) {
-        info.m_type = "VlClassRef<" + EmitCBaseVisitor::prefixNameProtect(adtypep) + ">";
+        info.m_type = "VlClassRef<" + EmitCBase::prefixNameProtect(adtypep) + ">";
    } else if (const auto* const adtypep = VN_CAST(dtypep, IfaceRefDType)) {
-        info.m_type = EmitCBaseVisitor::prefixNameProtect(adtypep->ifaceViaCellp()) + "*";
+        info.m_type = EmitCBase::prefixNameProtect(adtypep->ifaceViaCellp()) + "*";
    } else if (const auto* const adtypep = VN_CAST(dtypep, UnpackArrayDType)) {
        if (adtypep->isCompound()) compound = true;
        const CTypeRecursed sub = adtypep->subDTypep()->cTypeRecurse(compound);
        info.m_type = "VlUnpacked<" + sub.m_type;
        info.m_type += ", " + cvtToStr(adtypep->declRange().elements());
        info.m_type += ">";
-    } else if (VN_IS(dtypep, StructDType) && !VN_AS(dtypep, StructDType)->packed()) {
-        const auto* const sdtypep = VN_AS(dtypep, StructDType);
-        info.m_type = EmitCBaseVisitor::prefixNameProtect(sdtypep);
+    } else if (VN_IS(dtypep, NodeUOrStructDType) && !VN_AS(dtypep, NodeUOrStructDType)->packed()) {
+        const auto* const sdtypep = VN_AS(dtypep, NodeUOrStructDType);
+        info.m_type = EmitCBase::prefixNameProtect(sdtypep);
    } else if (const AstBasicDType* const bdtypep = dtypep->basicp()) {
        // We don't print msb()/lsb() as multidim packed would require recursion,
        // and may confuse users as C++ data is stored always with bit 0 used
@@ -766,6 +763,8 @@ AstNodeDType::CTypeRecursed AstNodeDType::cTypeRecurse(bool compound) const {
            info.m_type = "VlDynamicTriggerScheduler";
        } else if (bdtypep->isForkSync()) {
            info.m_type = "VlForkSync";
+        } else if (bdtypep->isProcessRef()) {
+            info.m_type = "VlProcessRef";
        } else if (bdtypep->isEvent()) {
            info.m_type = "VlEvent";
        } else if (dtypep->widthMin() <= 8) {  // Handle unpacked arrays; not bdtypep->width
@@ -840,7 +839,7 @@ int AstNodeDType::widthPow2() const {
    return 1;
 }

-bool AstNodeDType::isLiteralType() const VL_MT_SAFE {
+bool AstNodeDType::isLiteralType() const VL_MT_STABLE {
    if (const auto* const dtypep = VN_CAST(skipRefp(), BasicDType)) {
        return dtypep->keyword().isLiteralType();
    } else if (const auto* const dtypep = VN_CAST(skipRefp(), UnpackArrayDType)) {
@@ -869,7 +868,7 @@ AstNode* AstArraySel::baseFromp(AstNode* nodep, bool overMembers) {
            continue;
        }
        // AstNodeSelPre stashes the associated variable under an ATTROF
-        // of VAttrType::VAR_BASE/MEMBER_BASE so it isn't constified
+        // of VAttrType::VAR_BASE so it isn't constified
        else if (VN_IS(nodep, AttrOf)) {
            nodep = VN_AS(nodep, AttrOf)->fromp();
            continue;
@@ -910,10 +909,10 @@ void AstScope::cloneRelink() {
    }
 }
 string AstScope::nameDotless() const {
-    string out = shortName();
+    string result = shortName();
    string::size_type pos;
-    while ((pos = out.find('.')) != string::npos) out.replace(pos, 1, "__");
-    return out;
+    while ((pos = result.find('.')) != string::npos) result.replace(pos, 1, "__");
+    return result;
 }

 AstVarScope* AstScope::createTemp(const string& name, unsigned width) {
@@ -1051,6 +1050,15 @@ AstVoidDType* AstTypeTable::findVoidDType(FileLine* fl) {
    return m_voidp;
 }

+AstStreamDType* AstTypeTable::findStreamDType(FileLine* fl) {
+    if (VL_UNLIKELY(!m_streamp)) {
+        AstStreamDType* const newp = new AstStreamDType{fl};
+        addTypesp(newp);
+        m_streamp = newp;
+    }
+    return m_streamp;
+}
+
 AstQueueDType* AstTypeTable::findQueueIndexDType(FileLine* fl) {
    if (VL_UNLIKELY(!m_queueIndexp)) {
        AstQueueDType* const newp = new AstQueueDType{fl, AstNode::findUInt32DType(), nullptr};
@@ -1253,44 +1261,17 @@ AstVarScope* AstConstPool::findConst(AstConst* initp, bool mergeDType) {
 //======================================================================
 // Special walking tree inserters

-void AstNode::addBeforeStmt(AstNode* newp, AstNode*) {
-    UASSERT_OBJ(backp(), newp, "Can't find current statement to addBeforeStmt");
-    // Look up; virtual call will find where to put it
-    this->backp()->addBeforeStmt(newp, this);
-}
 void AstNode::addNextStmt(AstNode* newp, AstNode*) {
    UASSERT_OBJ(backp(), newp, "Can't find current statement to addNextStmt");
    // Look up; virtual call will find where to put it
    this->backp()->addNextStmt(newp, this);
 }

-void AstNodeStmt::addBeforeStmt(AstNode* newp, AstNode*) {
-    // Insert newp before current node
-    this->addHereThisAsNext(newp);
-}
 void AstNodeStmt::addNextStmt(AstNode* newp, AstNode*) {
    // Insert newp after current node
    this->addNextHere(newp);
 }

-void AstWhile::addBeforeStmt(AstNode* newp, AstNode* belowp) {
-    // Special, as statements need to be put in different places
-    // Belowp is how we came to recurse up to this point
-    // Preconditions insert first just before themselves (the normal rule
-    // for other statement types)
-    if (belowp == precondsp()) {
-        // Must have been first statement in precondsp list, so newp is new first statement
-        belowp->addHereThisAsNext(newp);
-    } else if (belowp == condp()) {
-        // Goes before condition, IE in preconditions
-        addPrecondsp(newp);
-    } else if (belowp == stmtsp()) {
-        // Was first statement in body, so new front
-        belowp->addHereThisAsNext(newp);
-    } else {
-        belowp->v3fatalSrc("Doesn't look like this was really under the while");
-    }
-}
 void AstWhile::addNextStmt(AstNode* newp, AstNode* belowp) {
    // Special, as statements need to be put in different places
    // Belowp is how we came to recurse up to this point
@@ -1361,6 +1342,7 @@ void AstNode::dump(std::ostream& str) const {
 void AstNodeProcedure::dump(std::ostream& str) const {
    this->AstNode::dump(str);
    if (isSuspendable()) str << " [SUSP]";
+    if (needProcess()) str << " [NPRC]";
 }

 void AstAlways::dump(std::ostream& str) const {
@@ -1424,29 +1406,17 @@ const char* AstClassPackage::broken() const {
 void AstClassPackage::cloneRelink() {
    if (m_classp && m_classp->clonep()) m_classp = m_classp->clonep();
 }
-void AstClass::insertCache(AstNode* nodep) {
-    const bool doit = (VN_IS(nodep, Var) || VN_IS(nodep, EnumItemRef)
-                       || (VN_IS(nodep, NodeFTask) && !VN_AS(nodep, NodeFTask)->isExternProto())
-                       || VN_IS(nodep, CFunc));
-    if (doit) {
-        if (m_members.find(nodep->name()) != m_members.end()) {
-            nodep->v3error("Duplicate declaration of member name: " << nodep->prettyNameQ());
-        } else {
-            m_members.emplace(nodep->name(), nodep);
-        }
-    }
+bool AstClass::isCacheableChild(const AstNode* nodep) {
+    return (VN_IS(nodep, Var) || VN_IS(nodep, EnumItemRef)
+            || (VN_IS(nodep, NodeFTask) && !VN_AS(nodep, NodeFTask)->isExternProto())
+            || VN_IS(nodep, CFunc));
 }
-void AstClass::repairCache() {
-    clearCache();
-    for (auto* itemp = membersp(); itemp; itemp = itemp->nextp()) {
-        if (const auto* const scopep = VN_CAST(itemp, Scope)) {
-            for (auto* blockp = scopep->blocksp(); blockp; blockp = blockp->nextp()) {
-                insertCache(blockp);
-            }
-        } else {
-            insertCache(itemp);
-        }
+AstClass* AstClass::baseMostClassp() {
+    AstClass* basep = this;
+    while (basep->extendsp() && basep->extendsp()->classp()) {
+        basep = basep->extendsp()->classp();
    }
+    return basep;
 }
 bool AstClass::isClassExtendedFrom(const AstClass* refClassp, const AstClass* baseClassp) {
    // TAIL RECURSIVE
@@ -1458,6 +1428,7 @@ bool AstClass::isClassExtendedFrom(const AstClass* refClassp, const AstClass* ba
 void AstClass::dump(std::ostream& str) const {
    this->AstNodeModule::dump(str);
    if (isExtended()) str << " [EXT]";
+    if (isInterfaceClass()) str << " [IFCCLS]";
    if (isVirtual()) str << " [VIRT]";
 }
 const char* AstClass::broken() const {
@@ -1471,13 +1442,24 @@ void AstClass::cloneRelink() {
        m_classOrPackagep = m_classOrPackagep->clonep();
    }
 }
-AstClass* AstClassExtends::classp() const {
-    const AstClassRefDType* refp = VN_CAST(dtypep(), ClassRefDType);
-    if (VL_UNLIKELY(!refp)) {  // LinkDot uses this for 'super.'
-        refp = VN_AS(childDTypep(), ClassRefDType);
+void AstClassExtends::dump(std::ostream& str) const {
+    this->AstNode::dump(str);
+    if (isImplements()) str << " [IMPLEMENTS]";
+}
+AstClass* AstClassExtends::classOrNullp() const {
+    const AstNodeDType* const dtp = dtypep() ? dtypep() : childDTypep();
+    const AstClassRefDType* const refp = VN_CAST(dtp, ClassRefDType);
+    if (refp && !refp->paramsp()) {
+        // Class already resolved
+        return refp->classp();
+    } else {
+        return nullptr;
    }
-    UASSERT_OBJ(refp, this, "class extends non-ref");
-    return refp->classp();
+}
+AstClass* AstClassExtends::classp() const {
+    AstClass* const clsp = classOrNullp();
+    UASSERT_OBJ(clsp, this, "Extended class is unresolved");
+    return clsp;
 }
 void AstClassRefDType::dump(std::ostream& str) const {
    this->AstNodeDType::dump(str);
@@ -1509,6 +1491,11 @@ void AstNodeCoverOrAssert::dump(std::ostream& str) const {
    this->AstNodeStmt::dump(str);
    if (immediate()) str << " [IMMEDIATE]";
 }
+void AstClocking::dump(std::ostream& str) const {
+    this->AstNode::dump(str);
+    if (isDefault()) str << " [DEFAULT]";
+    if (isGlobal()) str << " [GLOBAL]";
+}
 void AstDisplay::dump(std::ostream& str) const {
    this->AstNodeStmt::dump(str);
    // str << " " << displayType().ascii();
@@ -1636,6 +1623,25 @@ void AstLogOr::dump(std::ostream& str) const {
    this->AstNodeExpr::dump(str);
    if (sideEffect()) str << " [SIDE]";
 }
+
+void AstMemberDType::dumpSmall(std::ostream& str) const {
+    this->AstNodeDType::dumpSmall(str);
+    str << "member";
+}
+AstNodeUOrStructDType* AstMemberDType::getChildStructp() const {
+    AstNodeDType* subdtp = skipRefp();
+    while (AstNodeArrayDType* const asubdtp = VN_CAST(subdtp, NodeArrayDType)) {
+        subdtp = asubdtp->subDTypep();
+    }
+    return VN_CAST(subdtp, NodeUOrStructDType);  // Maybe nullptr
+}
+
+bool AstMemberSel::same(const AstNode* samep) const {
+    const AstMemberSel* const sp = static_cast<const AstMemberSel*>(samep);
+    return sp != nullptr && access() == sp->access() && fromp()->same(sp->fromp())
+           && name() == sp->name() && varp()->same(sp->varp());
+}
+
 void AstMemberSel::dump(std::ostream& str) const {
    this->AstNodeExpr::dump(str);
    str << " -> ";
@@ -1652,15 +1658,6 @@ const char* AstMemberSel::broken() const {
    BROKEN_RTN(m_varp && !m_varp->brokeExists());
    return nullptr;
 }
-void AstMethodCall::dump(std::ostream& str) const {
-    this->AstNodeFTaskRef::dump(str);
-    str << " -> ";
-    if (taskp()) {
-        taskp()->dump(str);
-    } else {
-        str << " -> UNLINKED";
-    }
-}
 void AstModportFTaskRef::dump(std::ostream& str) const {
    this->AstNode::dump(str);
    if (isExport()) str << " EXPORT";
@@ -1704,6 +1701,7 @@ void AstPin::dump(std::ostream& str) const {
    } else {
        str << " ->UNLINKED";
    }
+    if (svDotName()) str << " [.n]";
    if (svImplicit()) str << " [.SV]";
 }
 const char* AstPin::broken() const {
@@ -1746,7 +1744,7 @@ void AstTypedef::dump(std::ostream& str) const {
 void AstNodeRange::dump(std::ostream& str) const { this->AstNode::dump(str); }
 void AstRange::dump(std::ostream& str) const {
    this->AstNodeRange::dump(str);
-    if (littleEndian()) str << " [LITTLE]";
+    if (ascending()) str << " [ASCENDING]";
 }
 void AstParamTypeDType::dump(std::ostream& str) const {
    this->AstNodeDType::dump(str);
@@ -1792,7 +1790,7 @@ void AstRefDType::cloneRelink() {
        m_classOrPackagep = m_classOrPackagep->clonep();
    }
 }
-AstNodeDType* AstRefDType::subDTypep() const {
+AstNodeDType* AstRefDType::subDTypep() const VL_MT_STABLE {
    if (typedefp()) return typedefp()->subDTypep();
    return refDTypep();  // Maybe nullptr
 }
@@ -1800,6 +1798,7 @@ void AstNodeUOrStructDType::dump(std::ostream& str) const {
    this->AstNodeDType::dump(str);
    if (packed()) str << " [PACKED]";
    if (isFourstate()) str << " [4STATE]";
+    if (classOrPackagep()) str << " pkg=" << nodeAddr(classOrPackagep());
 }
 void AstNodeDType::dump(std::ostream& str) const {
    this->AstNode::dump(str);
@@ -2031,6 +2030,10 @@ void AstVoidDType::dumpSmall(std::ostream& str) const {
    this->AstNodeDType::dumpSmall(str);
    str << "void";
 }
+void AstStreamDType::dumpSmall(std::ostream& str) const {
+    this->AstNodeDType::dumpSmall(str);
+    str << "stream";
+}
 void AstVarScope::dump(std::ostream& str) const {
    this->AstNode::dump(str);
    if (isTrace()) str << " [T]";
@@ -2042,6 +2045,10 @@ void AstVarScope::dump(std::ostream& str) const {
        str << " ->UNLINKED";
    }
 }
+bool AstVarScope::same(const AstNode* samep) const {
+    const AstVarScope* const asamep = static_cast<const AstVarScope*>(samep);
+    return varp()->same(asamep->varp()) && scopep()->same(asamep->scopep());
+}
 void AstNodeVarRef::dump(std::ostream& str) const {
    this->AstNodeExpr::dump(str);
    if (classOrPackagep()) str << " pkg=" << nodeAddr(classOrPackagep());
@@ -2069,6 +2076,10 @@ void AstVarRef::dump(std::ostream& str) const {
        str << "UNLINKED";
    }
 }
+const char* AstVarRef::broken() const {
+    BROKEN_RTN(!varp());
+    return AstNodeVarRef::broken();
+}
 bool AstVarRef::same(const AstNode* samep) const {
    return same(static_cast<const AstVarRef*>(samep));
 }
@@ -2105,12 +2116,23 @@ void AstVar::dump(std::ostream& str) const {
    if (!lifetime().isNone()) str << " [" << lifetime().ascii() << "] ";
    str << " " << varType();
 }
+bool AstVar::same(const AstNode* samep) const {
+    const AstVar* const asamep = static_cast<const AstVar*>(samep);
+    return name() == asamep->name() && varType() == asamep->varType();
+}
 void AstScope::dump(std::ostream& str) const {
    this->AstNode::dump(str);
    str << " [abovep=" << reinterpret_cast<const void*>(aboveScopep()) << "]";
    str << " [cellp=" << reinterpret_cast<const void*>(aboveCellp()) << "]";
    str << " [modp=" << reinterpret_cast<const void*>(modp()) << "]";
 }
+bool AstScope::same(const AstNode* samep) const {
+    const AstScope* const asamep = static_cast<const AstScope*>(samep);
+    return name() == asamep->name()
+           && ((!aboveScopep() && !asamep->aboveScopep())
+               || (aboveScopep() && asamep->aboveScopep()
+                   && aboveScopep()->name() == asamep->aboveScopep()->name()));
+}
 void AstScopeName::dump(std::ostream& str) const {
    this->AstNodeExpr::dump(str);
    if (dpiExport()) str << " [DPIEX]";
@@ -2273,6 +2295,7 @@ void AstCFunc::dump(std::ostream& str) const {
    if (isDestructor()) str << " [DTOR]";
    if (isVirtual()) str << " [VIRT]";
    if (isCoroutine()) str << " [CORO]";
+    if (needProcess()) str << " [NPRC]";
 }
 const char* AstCAwait::broken() const {
    BROKEN_RTN(m_sensesp && !m_sensesp->brokeExists());
@@ -2292,7 +2315,7 @@ int AstCMethodHard::instrCount() const {
    if (AstBasicDType* const basicp = fromp()->dtypep()->basicp()) {
        // TODO: add a more structured description of library methods, rather than using string
        //       matching. See #3715.
-        if (basicp->isTriggerVec() && m_name == "at") {
+        if (basicp->isTriggerVec() && m_name == "word") {
            // This is an important special case for scheduling so we compute it precisely,
            // it is simply a load.
            return INSTR_COUNT_LD;
@@ -19,6 +19,7 @@
 //      Look for BEGINs
 //          BEGIN(VAR...) -> VAR ... {renamed}
 //      FOR -> WHILEs
+//      Move static function variables and their AstInitialStatic blocks before a function
 //
 // There are two scopes; named BEGINs change %m and variable scopes.
 // Unnamed BEGINs change only variable, not $display("%m") scope.
@@ -64,7 +65,7 @@ private:
    // STATE
    BeginState* const m_statep;  // Current global state
    AstNodeModule* m_modp = nullptr;  // Current module
-    const AstNodeFTask* m_ftaskp = nullptr;  // Current function/task
+    AstNodeFTask* m_ftaskp = nullptr;  // Current function/task
    AstNode* m_liftedp = nullptr;  // Local  nodes we are lifting into m_ftaskp
    string m_displayScope;  // Name of %m in $display/AstScopeName
    string m_namedScope;  // Name of begin blocks above us
@@ -76,6 +77,7 @@ private:

    string dot(const string& a, const string& b) {
        if (a == "") return b;
+        if (b == "") return a;
        return a + "__DOT__" + b;
    }

@@ -123,9 +125,20 @@ private:

    // VISITORS
    void visit(AstFork* nodep) override {
-        // Keep this begin to group its statements together
+        // Keep begins in forks to group their statements together
        VL_RESTORER(m_keepBegins);
        m_keepBegins = true;
+        // If a statement is not a begin, wrap it in a begin. This fixes an issue when the
+        // statement is a task call that gets inlined later (or any other statement that gets
+        // replaced with multiple statements)
+        for (AstNode* stmtp = nodep->stmtsp(); stmtp; stmtp = stmtp->nextp()) {
+            if (!VN_IS(stmtp, Begin)) {
+                AstBegin* const beginp = new AstBegin{stmtp->fileline(), "", nullptr};
+                stmtp->replaceWith(beginp);
+                beginp->addStmtsp(stmtp);
+                stmtp = beginp;
+            }
+        }
        dotNames(nodep, "__FORK__");
        nodep->name("");
    }
@@ -165,6 +178,10 @@ private:
            m_ftaskp = nodep;
            m_liftedp = nullptr;
            iterateChildren(nodep);
+            nodep->foreach([&](AstInitialStatic* const initp) {
+                initp->unlinkFrBack();
+                m_ftaskp->addHereThisAsNext(initp);
+            });
            if (m_liftedp) {
                // Place lifted nodes at beginning of stmtsp, so Var nodes appear before referenced
                if (AstNode* const stmtsp = nodep->stmtsp()) {
@@ -210,7 +227,15 @@ private:
        }
    }
    void visit(AstVar* nodep) override {
-        if (m_unnamedScope != "") {
+        // If static variable, move it outside a function.
+        if (nodep->lifetime().isStatic() && m_ftaskp) {
+            const std::string newName
+                = m_ftaskp->name() + "__Vstatic__" + dot(m_unnamedScope, nodep->name());
+            nodep->name(newName);
+            nodep->unlinkFrBack();
+            m_ftaskp->addHereThisAsNext(nodep);
+            nodep->funcLocal(false);
+        } else if (m_unnamedScope != "") {
            // Rename it
            nodep->name(dot(m_unnamedScope, nodep->name()));
            m_statep->userMarkChanged(nodep);
@@ -257,7 +282,7 @@ private:
            // To keep correct visual order, must add before other Text's
            AstText* const afterp = nodep->scopeAttrp();
            if (afterp) afterp->unlinkFrBackWithNext();
-            nodep->addScopeAttrp(new AstText{nodep->fileline(), string("__DOT__") + scname});
+            nodep->addScopeAttrp(new AstText{nodep->fileline(), string{"__DOT__"} + scname});
            if (afterp) nodep->addScopeAttrp(afterp);
        }
        iterateChildren(nodep);
@@ -319,7 +344,6 @@ private:
    void visit(AstVarRef* nodep) override {
        if (nodep->varp()->user1()) {  // It was converted
            UINFO(9, "    relinVarRef " << nodep << endl);
-            nodep->name(nodep->varp()->name());
        }
        iterateChildren(nodep);
    }
@@ -350,5 +374,5 @@ void V3Begin::debeginAll(AstNetlist* nodep) {
        { BeginVisitor{nodep, &state}; }
        if (state.anyFuncInBegin()) { BeginRelinkVisitor{nodep, &state}; }
    }  // Destruct before checking
-    V3Global::dumpCheckGlobalTree("begin", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("begin", 0, dumpTreeLevel() >= 3);
 }
@@ -38,17 +38,19 @@ VL_DEFINE_DEBUG_FUNCTIONS;
 //######################################################################
 // Branch state, as a visitor of each AstNode

-class BranchVisitor final : public VNVisitor {
+class BranchVisitor final : public VNVisitorConst {
 private:
    // NODE STATE
    // Entire netlist:
    //  AstFTask::user1()       -> int.  Number of references
    const VNUser1InUse m_inuser1;

-    // STATE
+    // STATE - across all visitors
+    std::vector<AstCFunc*> m_cfuncsp;  // List of all tasks
+
+    // STATE - for current visit position (use VL_RESTORER)
    int m_likely = false;  // Excuses for branch likely taken
    int m_unlikely = false;  // Excuses for branch likely not taken
-    std::vector<AstCFunc*> m_cfuncsp;  // List of all tasks

    // METHODS

@@ -71,12 +73,12 @@ private:
        {
            // Do if
            reset();
-            iterateAndNextNull(nodep->thensp());
+            iterateAndNextConstNull(nodep->thensp());
            const int ifLikely = m_likely;
            const int ifUnlikely = m_unlikely;
            // Do else
            reset();
-            iterateAndNextNull(nodep->elsesp());
+            iterateAndNextConstNull(nodep->elsesp());
            const int elseLikely = m_likely;
            const int elseUnlikely = m_unlikely;
            // Compute
@@ -91,16 +93,16 @@ private:
    void visit(AstNodeCCall* nodep) override {
        checkUnlikely(nodep);
        nodep->funcp()->user1Inc();
-        iterateChildren(nodep);
+        iterateChildrenConst(nodep);
    }
    void visit(AstCFunc* nodep) override {
        checkUnlikely(nodep);
        m_cfuncsp.push_back(nodep);
-        iterateChildren(nodep);
+        iterateChildrenConst(nodep);
    }
    void visit(AstNode* nodep) override {
        checkUnlikely(nodep);
-        iterateChildren(nodep);
+        iterateChildrenConst(nodep);
    }

    // METHODS
@@ -114,7 +116,7 @@ public:
    // CONSTRUCTORS
    explicit BranchVisitor(AstNetlist* nodep) {
        reset();
-        iterateChildren(nodep);
+        iterateChildrenConst(nodep);
        calc_tasks();
    }
    ~BranchVisitor() override = default;
@@ -62,6 +62,8 @@ public:
    }
 } s_brokenCntGlobal;

+static bool s_brokenAllowMidvisitorCheck = false;
+
 //######################################################################
 // Table of allocated AstNode pointers

@@ -144,7 +146,7 @@ bool V3Broken::isLinkable(const AstNode* nodep) { return s_linkableTable.isLinka
 //######################################################################
 // Check every node in tree

-class BrokenCheckVisitor final : public VNVisitor {
+class BrokenCheckVisitor final : public VNVisitorConst {
    bool m_inScope = false;  // Under AstScope

    // Constants for marking we are under/not under a node
@@ -172,6 +174,7 @@ private:
        const char* const whyp = nodep->broken();
        UASSERT_OBJ(!whyp, nodep,
                    "Broken link in node (or something without maybePointedTo): " << whyp);
+        if (!s_brokenAllowMidvisitorCheck) nodep->checkIter();
        if (nodep->dtypep()) {
            UASSERT_OBJ(nodep->dtypep()->brokeExists(), nodep,
                        "Broken link in node->dtypep() to " << cvtToHex(nodep->dtypep()));
@@ -312,7 +315,7 @@ private:

 public:
    // CONSTRUCTORS
-    explicit BrokenCheckVisitor(AstNetlist* nodep) { iterate(nodep); }
+    explicit BrokenCheckVisitor(AstNetlist* nodep) { iterateConstNull(nodep); }
    ~BrokenCheckVisitor() override = default;
 };

@@ -351,6 +354,8 @@ void V3Broken::brokenAll(AstNetlist* nodep) {
    }
 }

+void V3Broken::allowMidvisitorCheck(bool flag) { s_brokenAllowMidvisitorCheck = flag; }
+
 //######################################################################
 // Self test

@@ -32,6 +32,9 @@ public:
    static bool isLinkable(const AstNode* nodep);
    static void addNewed(const AstNode* nodep);
    static void deleted(const AstNode* nodep);
+    // Called on error to say may be inside visitor,
+    // Disables checks that may misfire if not called at stable point between visitors
+    static void allowMidvisitorCheck(bool flag);
    static void selfTest();
 };

@@ -70,7 +70,7 @@ private:
        funcp->slow(!m_type.isClass());  // Only classes construct on fast path
        string preventUnusedStmt;
        if (m_type.isClass()) {
-            funcp->argTypes(EmitCBaseVisitor::symClassVar());
+            funcp->argTypes(EmitCBase::symClassVar());
            preventUnusedStmt = "if (false && vlSymsp) {}  // Prevent unused\n";
        } else if (m_type.isCoverage()) {
            funcp->argTypes("bool first");
@@ -148,6 +148,7 @@ private:
        m_modp = nodep;
        V3CCtorsBuilder var_reset{nodep, "_ctor_var_reset",
                                  VN_IS(nodep, Class) ? VCtorType::CLASS : VCtorType::MODULE};
+        // cppcheck-suppress danglingLifetime
        m_varResetp = &var_reset;
        iterateChildren(nodep);

@@ -155,6 +156,9 @@ private:
            V3CCtorsBuilder configure_coverage{nodep, "_configure_coverage", VCtorType::COVERAGE};
            for (AstNode* np = nodep->stmtsp(); np; np = np->nextp()) {
                if (AstCoverDecl* const coverp = VN_CAST(np, CoverDecl)) {
+                    // ... else we don't have a static VlSym to be able to coverage insert
+                    UASSERT_OBJ(!VN_IS(nodep, Class), coverp,
+                                "CoverDecl should be in class's package, not class itself");
                    np = coverp->backp();
                    configure_coverage.add(coverp->unlinkFrBack());
                }
@@ -198,7 +202,7 @@ private:

 public:
    // CONSTRUCTORS
-    CCtorsVisitor(AstNode* nodep) { iterate(nodep); }
+    explicit CCtorsVisitor(AstNode* nodep) { iterate(nodep); }
    ~CCtorsVisitor() override = default;
 };

@@ -253,5 +257,5 @@ void V3CCtors::cctorsAll() {
    UINFO(2, __FUNCTION__ << ": " << endl);
    evalAsserts();
    { CCtorsVisitor{v3Global.rootp()}; }
-    V3Global::dumpCheckGlobalTree("cctors", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("cctors", 0, dumpTreeLevel() >= 3);
 }
@@ -45,12 +45,16 @@ class CUseVisitor final : public VNVisitor {
    const VNUser1InUse m_inuser1;

    // MEMBERS
-    bool m_impOnly = false;  // In details needed only for implementation
    AstNodeModule* const m_modp;  // Current module
    std::set<std::pair<VUseType, std::string>> m_didUse;  // What we already used
+    bool m_dtypesImplOnly = false;

    // METHODS
    void addNewUse(AstNode* nodep, VUseType useType, const string& name) {
+        if (m_dtypesImplOnly
+            && (useType == VUseType::INT_INCLUDE || useType == VUseType::INT_FWD_CLASS))
+            return;
+
        if (m_didUse.emplace(useType, name).second) {
            AstCUse* const newp = new AstCUse{nodep->fileline(), useType, name};
            m_modp->addStmtsp(newp);
@@ -61,12 +65,29 @@ class CUseVisitor final : public VNVisitor {
    // VISITORS
    void visit(AstClassRefDType* nodep) override {
        if (nodep->user1SetOnce()) return;  // Process once
-        if (!m_impOnly) addNewUse(nodep, VUseType::INT_FWD_CLASS, nodep->classp()->name());
-        // Need to include extends() when we implement, but no need for pointers to know
-        VL_RESTORER(m_impOnly);
+        addNewUse(nodep, VUseType::INT_FWD_CLASS, nodep->classp()->name());
+    }
+    void visit(AstCFunc* nodep) override {
+        if (nodep->user1SetOnce()) return;  // Process once
+        iterateAndNextNull(nodep->argsp());
+
        {
-            m_impOnly = true;
-            iterateChildren(nodep->classp());  // This also gets all extend classes
+            VL_RESTORER(m_dtypesImplOnly);
+            m_dtypesImplOnly = true;
+
+            iterateAndNextNull(nodep->initsp());
+            iterateAndNextNull(nodep->stmtsp());
+            iterateAndNextNull(nodep->finalsp());
+        }
+    }
+    void visit(AstCReturn* nodep) override {
+        if (nodep->user1SetOnce()) return;  // Process once
+        if (m_dtypesImplOnly) {
+            for (AstNode* exprp = nodep->op1p(); exprp; exprp = exprp->nextp()) {
+                if (exprp->dtypep()) iterate(exprp->dtypep());
+            }
+        } else {
+            iterateChildren(nodep);
        }
    }
    void visit(AstNodeDType* nodep) override {
@@ -75,10 +96,12 @@ class CUseVisitor final : public VNVisitor {
        if (nodep->virtRefDType2p()) iterate(nodep->virtRefDType2p());

        // Add a CUse for every struct that requires a declaration
-        AstStructDType* const stypep = VN_CAST(nodep->skipRefp(), StructDType);
+        AstNodeUOrStructDType* const stypep = VN_CAST(nodep->skipRefp(), NodeUOrStructDType);
        if (stypep && stypep->classOrPackagep()) {
            addNewUse(nodep, VUseType::INT_INCLUDE, stypep->classOrPackagep()->name());
            iterateChildren(stypep);
+        } else if (AstClassRefDType* const classp = VN_CAST(nodep->skipRefp(), ClassRefDType)) {
+            addNewUse(nodep, VUseType::INT_FWD_CLASS, classp->name());
        }
    }
    void visit(AstNode* nodep) override {
@@ -115,5 +138,5 @@ void V3CUse::cUseAll() {
        // for each output file and put under that
        CUseVisitor{modp};
    }
-    V3Global::dumpCheckGlobalTree("cuse", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("cuse", 0, dumpTreeLevel() >= 3);
 }
@@ -53,7 +53,7 @@ VL_DEFINE_DEBUG_FUNCTIONS;

 //######################################################################

-class CaseLintVisitor final : public VNVisitor {
+class CaseLintVisitor final : public VNVisitorConst {
 private:
    const AstNodeCase* m_caseExprp
        = nullptr;  // Under a CASE value node, if so the relevant case statement
@@ -79,10 +79,10 @@ private:
        // Check for X/Z in non-casex statements
        {
            m_caseExprp = nodep;
-            iterate(nodep->exprp());
+            iterateConst(nodep->exprp());
            for (AstCaseItem* itemp = nodep->itemsp(); itemp;
                 itemp = VN_AS(itemp->nextp(), CaseItem)) {
-                iterateAndNextNull(itemp->condsp());
+                iterateAndNextConstNull(itemp->condsp());
            }
            m_caseExprp = nullptr;
        }
@@ -108,11 +108,11 @@ private:
            }
        }
    }
-    void visit(AstNode* nodep) override { iterateChildren(nodep); }
+    void visit(AstNode* nodep) override { iterateChildrenConst(nodep); }

 public:
    // CONSTRUCTORS
-    explicit CaseLintVisitor(AstNodeCase* nodep) { iterate(nodep); }
+    explicit CaseLintVisitor(AstNodeCase* nodep) { iterateConst(nodep); }
    ~CaseLintVisitor() override = default;
 };

@@ -566,7 +566,7 @@ public:
 void V3Case::caseAll(AstNetlist* nodep) {
    UINFO(2, __FUNCTION__ << ": " << endl);
    { CaseVisitor{nodep}; }  // Destruct before checking
-    V3Global::dumpCheckGlobalTree("case", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("case", 0, dumpTreeLevel() >= 3);
 }
 void V3Case::caseLint(AstNodeCase* nodep) {
    UINFO(4, __FUNCTION__ << ": " << endl);
@@ -122,6 +122,31 @@ private:
        if (nodep->sizeMattersLhs()) ensureCast(nodep->lhsp());
        if (nodep->sizeMattersRhs()) ensureCast(nodep->rhsp());
    }
+    void visit(AstNodeCond* nodep) override {
+        // All class types are castable to each other. If they are of different types,
+        // a compilation error will be thrown, so an explicit cast is required. Types were
+        // already checked by V3Width and dtypep of a condition operator is a type of their
+        // common base class, so both classes can be safetly casted.
+        const AstClassRefDType* const thenClassDtypep
+            = VN_CAST(nodep->thenp()->dtypep(), ClassRefDType);
+        const AstClassRefDType* const elseClassDtypep
+            = VN_CAST(nodep->elsep()->dtypep(), ClassRefDType);
+        const bool castRequired = thenClassDtypep && elseClassDtypep
+                                  && (thenClassDtypep->classp() != elseClassDtypep->classp());
+        if (castRequired) {
+            const AstClass* const commonBaseClassp
+                = VN_AS(nodep->dtypep(), ClassRefDType)->classp();
+            if (thenClassDtypep->classp() != commonBaseClassp) {
+                AstNodeExpr* thenp = nodep->thenp()->unlinkFrBack();
+                nodep->thenp(new AstCCast{thenp->fileline(), thenp, nodep});
+            }
+            if (elseClassDtypep->classp() != commonBaseClassp) {
+                AstNodeExpr* elsep = nodep->elsep()->unlinkFrBack();
+                nodep->elsep(new AstCCast{elsep->fileline(), elsep, nodep});
+            }
+        }
+        visit(static_cast<AstNodeTriop*>(nodep));
+    }
    void visit(AstNodeTriop* nodep) override {
        iterateChildren(nodep);
        nodep->user1(nodep->lhsp()->user1() | nodep->rhsp()->user1() | nodep->thsp()->user1());
@@ -161,7 +186,8 @@ private:
            && !VN_IS(backp, NodeCCall) && !VN_IS(backp, CMethodHard) && !VN_IS(backp, SFormatF)
            && !VN_IS(backp, ArraySel) && !VN_IS(backp, StructSel) && !VN_IS(backp, RedXor)
            && (nodep->varp()->basicp() && !nodep->varp()->basicp()->isTriggerVec()
-                && !nodep->varp()->basicp()->isForkSync())
+                && !nodep->varp()->basicp()->isForkSync()
+                && !nodep->varp()->basicp()->isProcessRef())
            && backp->width() && castSize(nodep) != castSize(nodep->varp())) {
            // Cast vars to IData first, else below has upper bits wrongly set
            //  CData x=3; out = (QData)(x<<30);
@@ -208,5 +234,5 @@ public:
 void V3Cast::castAll(AstNetlist* nodep) {
    UINFO(2, __FUNCTION__ << ": " << endl);
    { CastVisitor{nodep}; }  // Destruct before checking
-    V3Global::dumpCheckGlobalTree("cast", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("cast", 0, dumpTreeLevel() >= 3);
 }
@@ -1,765 +0,0 @@
-// -*- mode: C++; c-file-style: "cc-mode" -*-
-//*************************************************************************
-// DESCRIPTION: Verilator: Clock Domain Crossing Lint
-//
-// Code available from: https://verilator.org
-//
-//*************************************************************************
-//
-// Copyright 2003-2023 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
-//
-//*************************************************************************
-// V3Cdc's Transformations:
-//
-// Create V3Graph-ish graph
-// Find all negedge reset flops
-// Trace back to previous flop
-//
-//*************************************************************************
-
-#include "config_build.h"
-#include "verilatedos.h"
-
-#include "V3Cdc.h"
-
-#include "V3Ast.h"
-#include "V3Const.h"
-#include "V3EmitV.h"
-#include "V3File.h"
-#include "V3Global.h"
-#include "V3Graph.h"
-
-#include <algorithm>
-#include <deque>
-#include <iomanip>
-#include <memory>
-
-VL_DEFINE_DEBUG_FUNCTIONS;
-
-constexpr int CDC_WEIGHT_ASYNC = 0x1000;  // Weight for edges that feed async logic
-
-//######################################################################
-
-class CdcBaseVisitor VL_NOT_FINAL : public VNVisitor {
-public:
-};
-
-//######################################################################
-// Graph support classes
-
-class CdcEitherVertex VL_NOT_FINAL : public V3GraphVertex {
-    AstScope* const m_scopep;
-    AstNode* const m_nodep;
-    AstSenTree* m_srcDomainp = nullptr;
-    AstSenTree* m_dstDomainp = nullptr;
-    bool m_srcDomainSet : 1;
-    bool m_dstDomainSet : 1;
-    bool m_asyncPath : 1;
-
-public:
-    CdcEitherVertex(V3Graph* graphp, AstScope* scopep, AstNode* nodep)
-        : V3GraphVertex{graphp}
-        , m_scopep{scopep}
-        , m_nodep{nodep}
-        , m_srcDomainSet{false}
-        , m_dstDomainSet{false}
-        , m_asyncPath{false} {}
-    ~CdcEitherVertex() override = default;
-    // ACCESSORS
-    FileLine* fileline() const override { return nodep()->fileline(); }
-    AstScope* scopep() const { return m_scopep; }
-    AstNode* nodep() const { return m_nodep; }
-    AstSenTree* srcDomainp() const { return m_srcDomainp; }
-    void srcDomainp(AstSenTree* nodep) { m_srcDomainp = nodep; }
-    bool srcDomainSet() const { return m_srcDomainSet; }
-    void srcDomainSet(bool flag) { m_srcDomainSet = flag; }
-    AstSenTree* dstDomainp() const { return m_dstDomainp; }
-    void dstDomainp(AstSenTree* nodep) { m_dstDomainp = nodep; }
-    bool dstDomainSet() const { return m_dstDomainSet; }
-    void dstDomainSet(bool flag) { m_dstDomainSet = flag; }
-    bool asyncPath() const { return m_asyncPath; }
-    void asyncPath(bool flag) { m_asyncPath = flag; }
-};
-
-class CdcVarVertex final : public CdcEitherVertex {
-    AstVarScope* const m_varScp;
-    int m_cntAsyncRst = 0;
-    bool m_fromFlop = false;
-
-public:
-    CdcVarVertex(V3Graph* graphp, AstScope* scopep, AstVarScope* varScp)
-        : CdcEitherVertex{graphp, scopep, varScp}
-        , m_varScp{varScp} {}
-    ~CdcVarVertex() override = default;
-    // ACCESSORS
-    AstVarScope* varScp() const { return m_varScp; }
-    string name() const override { return (cvtToHex(m_varScp) + " " + varScp()->name()); }
-    string dotColor() const override {
-        return fromFlop() ? "green" : cntAsyncRst() ? "red" : "blue";
-    }
-    int cntAsyncRst() const { return m_cntAsyncRst; }
-    void cntAsyncRst(int flag) { m_cntAsyncRst = flag; }
-    bool fromFlop() const { return m_fromFlop; }
-    void fromFlop(bool flag) { m_fromFlop = flag; }
-};
-
-class CdcLogicVertex final : public CdcEitherVertex {
-    bool m_hazard : 1;
-    bool m_isFlop : 1;
-
-public:
-    CdcLogicVertex(V3Graph* graphp, AstScope* scopep, AstNode* nodep, AstSenTree* sensenodep)
-        : CdcEitherVertex{graphp, scopep, nodep}
-        , m_hazard{false}
-        , m_isFlop{false} {
-        srcDomainp(sensenodep);
-        dstDomainp(sensenodep);
-    }
-    ~CdcLogicVertex() override = default;
-    // ACCESSORS
-    string name() const override { return (cvtToHex(nodep()) + "@" + scopep()->prettyName()); }
-    string dotColor() const override { return hazard() ? "black" : "yellow"; }
-    bool hazard() const { return m_hazard; }
-    void setHazard(AstNode* nodep) {
-        m_hazard = true;
-        nodep->user3(true);
-    }
-    void clearHazard() { m_hazard = false; }
-    bool isFlop() const { return m_isFlop; }
-    void isFlop(bool flag) { m_isFlop = flag; }
-};
-
-//######################################################################
-
-class CdcDumpVisitor final : public CdcBaseVisitor {
-private:
-    // NODE STATE
-    // Entire netlist:
-    // {statement}Node::user3   -> bool, indicating not hazard
-    std::ofstream* const m_ofp = nullptr;  // Output file
-    string m_prefix;
-
-    void visit(AstNode* nodep) override {
-        *m_ofp << m_prefix;
-        if (nodep->user3()) {
-            *m_ofp << " %%";
-        } else {
-            *m_ofp << "  ";
-        }
-        *m_ofp << nodep->prettyTypeName() << "\n";
-        const string lastPrefix = m_prefix;
-        m_prefix = lastPrefix + "1:";
-        iterateAndNextNull(nodep->op1p());
-        m_prefix = lastPrefix + "2:";
-        iterateAndNextNull(nodep->op2p());
-        m_prefix = lastPrefix + "3:";
-        iterateAndNextNull(nodep->op3p());
-        m_prefix = lastPrefix + "4:";
-        iterateAndNextNull(nodep->op4p());
-        m_prefix = lastPrefix;
-    }
-
-public:
-    // CONSTRUCTORS
-    CdcDumpVisitor(AstNode* nodep, std::ofstream* ofp, const string& prefix)
-        : m_ofp{ofp}
-        , m_prefix{prefix} {
-        iterate(nodep);
-    }
-    ~CdcDumpVisitor() override = default;
-};
-
-//######################################################################
-
-class CdcWidthVisitor final : public CdcBaseVisitor {
-private:
-    size_t m_maxFilenameLen = 0;
-    int m_maxLineno = 0;
-
-    void visit(AstNode* nodep) override {
-        iterateChildren(nodep);
-        // Keeping line+filename lengths separate is much faster than calling ascii().length()
-        if (nodep->fileline()->lineno() >= m_maxLineno) {
-            m_maxLineno = nodep->fileline()->lineno() + 1;
-        }
-        if (nodep->fileline()->filename().length() >= m_maxFilenameLen) {
-            m_maxFilenameLen = nodep->fileline()->filename().length() + 1;
-        }
-    }
-
-public:
-    // CONSTRUCTORS
-    explicit CdcWidthVisitor(AstNode* nodep) { iterate(nodep); }
-    ~CdcWidthVisitor() override = default;
-    // ACCESSORS
-    int maxWidth() const {
-        size_t width = 1;
-        width += m_maxFilenameLen;
-        width += 1;  // The :
-        width += cvtToStr(m_maxLineno).length();
-        width += 1;  // Final :
-        return static_cast<int>(width);
-    }
-};
-
-//######################################################################
-// Cdc class functions
-
-class CdcVisitor final : public CdcBaseVisitor {
-private:
-    // NODE STATE
-    // Entire netlist:
-    // AstVarScope::user1p      -> CdcVarVertex* for usage var, 0=not set yet
-    // AstVarScope::user2       -> bool  Used in sensitivity list
-    // {statement}Node::user1p  -> CdcLogicVertex* for this statement
-    // AstNode::user3           -> bool  True indicates to print %% (via V3EmitV)
-    const VNUser1InUse m_inuser1;
-    const VNUser2InUse m_inuser2;
-    const VNUser3InUse m_inuser3;
-
-    // STATE
-    V3Graph m_graph;  // Scoreboard of var usages/dependencies
-    CdcLogicVertex* m_logicVertexp = nullptr;  // Current statement being tracked, nullptr=ignored
-    AstScope* m_scopep = nullptr;  // Current scope being processed
-    const AstNodeModule* m_modp = nullptr;  // Current module
-    AstSenTree* m_domainp = nullptr;  // Current sentree
-    bool m_inDly = false;  // In delayed assign
-    int m_inSenItem = 0;  // Number of senitems
-    string m_ofFilename;  // Output filename
-    std::ofstream* m_ofp;  // Output file
-    uint32_t m_userGeneration = 0;  // Generation count to avoid slow userClearVertices
-    int m_filelineWidth = 0;  // Characters in longest fileline
-
-    // METHODS
-    void iterateNewStmt(AstNode* nodep) {
-        if (m_scopep) {
-            VL_RESTORER(m_logicVertexp);
-            UINFO(4, "   STMT " << nodep << endl);
-            m_logicVertexp = new CdcLogicVertex{&m_graph, m_scopep, nodep, m_domainp};
-            if (m_domainp && m_domainp->hasClocked()) {  // To/from a flop
-                m_logicVertexp->isFlop(true);
-                m_logicVertexp->srcDomainp(m_domainp);
-                m_logicVertexp->srcDomainSet(true);
-                m_logicVertexp->dstDomainp(m_domainp);
-                m_logicVertexp->dstDomainSet(true);
-            }
-            iterateChildren(nodep);
-
-            if (false && debug() >= 9) {
-                UINFO(9, "Trace Logic:\n");
-                nodep->dumpTree("-  log1: ");
-            }
-        }
-    }
-
-    CdcVarVertex* makeVarVertex(AstVarScope* varscp) {
-        CdcVarVertex* vertexp = reinterpret_cast<CdcVarVertex*>(varscp->user1p());
-        if (!vertexp) {
-            UINFO(6, "New vertex " << varscp << endl);
-            vertexp = new CdcVarVertex{&m_graph, m_scopep, varscp};
-            varscp->user1p(vertexp);
-            if (varscp->varp()->isUsedClock()) {}
-            if (varscp->varp()->isPrimaryIO()) {
-                // Create IO vertex - note it's relative to the pointed to var, not where we are
-                // now This allows reporting to easily print the input statement
-                CdcLogicVertex* const ioVertexp
-                    = new CdcLogicVertex{&m_graph, varscp->scopep(), varscp->varp(), nullptr};
-                if (varscp->varp()->isWritable()) {
-                    new V3GraphEdge{&m_graph, vertexp, ioVertexp, 1};
-                } else {
-                    new V3GraphEdge{&m_graph, ioVertexp, vertexp, 1};
-                }
-            }
-        }
-        if (m_inSenItem) {
-            varscp->user2(true);  // It's like a clock...
-            // TODO: In the future mark it here and do normal clock tree glitch checks also
-        } else if (varscp->user2()) {  // It was detected in a sensitivity list earlier
-            // And now it's used as logic.  So must be a reset.
-            vertexp->cntAsyncRst(vertexp->cntAsyncRst() + 1);
-        }
-        return vertexp;
-    }
-
-    void warnAndFile(AstNode* nodep, V3ErrorCode code, const string& msg) {
-        static bool told_file = false;
-        nodep->v3warnCode(code, msg);
-        if (!told_file) {
-            told_file = true;
-            std::cerr << V3Error::msgPrefix() << "     See details in " << m_ofFilename << endl;
-        }
-        *m_ofp << "%Warning-" << code.ascii() << ": " << nodep->fileline() << " " << msg << '\n';
-    }
-
-    void setNodeHazard(AstNode* nodep) {
-        // Need to not clear if warnings are off (rather than when report it)
-        // as bypassing this warning may turn up another path that isn't warning off'ed.
-        // We can't modifyWarnOff here, as one instantiation might not be
-        // an issue until we find a hitting flop.
-        // Furthermore, a module like a "Or" module would only get flagged
-        // once, even though the signals feeding it are radically different.
-        if (!m_domainp || m_domainp->hasCombo()) {
-            // Source flop logic in a posedge block is OK for reset (not async though)
-            if (m_logicVertexp && !nodep->fileline()->warnIsOff(V3ErrorCode::CDCRSTLOGIC)) {
-                UINFO(8, "Set hazard " << nodep << endl);
-                m_logicVertexp->setHazard(nodep);
-            }
-        }
-    }
-
-    static string spaces(int level) {
-        string out;
-        while (level--) out += " ";
-        return out;
-    }  // LCOV_EXCL_LINE
-    static string pad(unsigned column, const string& in) {
-        string out = in;
-        while (out.length() < column) out += ' ';
-        return out;
-    }
-
-    void analyze() {
-        UINFO(3, __FUNCTION__ << ": " << endl);
-        if (dumpGraph() > 6) m_graph.dumpDotFilePrefixed("cdc_pre");
-        // This will MAX across edge weights
-        m_graph.removeRedundantEdges(&V3GraphEdge::followAlwaysTrue);
-        //
-        if (dumpGraph() >= 3) m_graph.dumpDotFilePrefixed("cdc_simp");
-        //
-        analyzeReset();
-    }
-
-    int filelineWidth() {
-        if (!m_filelineWidth) {
-            const CdcWidthVisitor visitor{v3Global.rootp()};
-            m_filelineWidth = visitor.maxWidth();
-        }
-        return m_filelineWidth;
-    }
-
-    //----------------------------------------
-    // RESET REPORT
-
-    void analyzeReset() {
-        // Find all async reset wires, and trace backwards
-        // userClearVertices is very slow, so we use a generation count instead
-        m_graph.userClearVertices();  // user1: uint32_t - was analyzed generation
-        for (V3GraphVertex* itp = m_graph.verticesBeginp(); itp; itp = itp->verticesNextp()) {
-            if (CdcVarVertex* const vvertexp = dynamic_cast<CdcVarVertex*>(itp)) {
-                if (vvertexp->cntAsyncRst()) {
-                    m_userGeneration++;  // Effectively a userClearVertices()
-                    UINFO(8, "   Trace One async: " << vvertexp << endl);
-                    // Twice, as we need to detect, then propagate
-                    CdcEitherVertex* const markp = traceAsyncRecurse(vvertexp, false);
-                    if (markp) {  // Mark is non-nullptr if something bad on this path
-                        UINFO(9, "   Trace One bad! " << vvertexp << endl);
-                        m_userGeneration++;  // Effectively a userClearVertices()
-                        traceAsyncRecurse(vvertexp, true);
-                        m_userGeneration++;  // Effectively a userClearVertices()
-                        dumpAsync(vvertexp, markp);
-                    }
-                }
-            }
-        }
-    }
-
-    CdcEitherVertex* traceAsyncRecurse(CdcEitherVertex* vertexp, bool mark) {
-        // First pass: Return vertex of any hazardous stuff attached, or nullptr if OK
-        // If first pass returns true, second pass calls asyncPath() on appropriate nodes
-        if (vertexp->user() >= m_userGeneration) return nullptr;  // Processed - prevent loop
-        vertexp->user(m_userGeneration);
-
-        CdcEitherVertex* mark_outp = nullptr;
-        UINFO(9, "      Trace: " << vertexp << endl);
-
-        // Clear out in prep for marking next path
-        if (!mark) vertexp->asyncPath(false);
-
-        if (CdcLogicVertex* const vvertexp = dynamic_cast<CdcLogicVertex*>(vertexp)) {
-            // Any logic considered bad, at the moment, anyhow
-            if (vvertexp->hazard() && !mark_outp) mark_outp = vvertexp;
-            // And keep tracing back so the user can understand what's up
-        } else if (CdcVarVertex* const vvertexp = dynamic_cast<CdcVarVertex*>(vertexp)) {
-            if (mark) vvertexp->asyncPath(true);
-            // If primary I/O, it's ok here back
-            if (vvertexp->varScp()->varp()->isPrimaryInish()) {
-                // Show the source "input" statement if it exists
-                for (V3GraphEdge* edgep = vertexp->inBeginp(); edgep; edgep = edgep->inNextp()) {
-                    CdcEitherVertex* const eFromVertexp
-                        = static_cast<CdcEitherVertex*>(edgep->fromp());
-                    eFromVertexp->asyncPath(true);
-                }
-                return nullptr;
-            }
-            // Also ok if from flop, but partially trace the flop so more obvious to users
-            if (vvertexp->fromFlop()) {
-                for (V3GraphEdge* edgep = vertexp->inBeginp(); edgep; edgep = edgep->inNextp()) {
-                    CdcEitherVertex* const eFromVertexp
-                        = static_cast<CdcEitherVertex*>(edgep->fromp());
-                    eFromVertexp->asyncPath(true);
-                }
-                return nullptr;
-            }
-        }
-
-        for (V3GraphEdge* edgep = vertexp->inBeginp(); edgep; edgep = edgep->inNextp()) {
-            CdcEitherVertex* const eFromVertexp = static_cast<CdcEitherVertex*>(edgep->fromp());
-            CdcEitherVertex* const submarkp = traceAsyncRecurse(eFromVertexp, mark);
-            if (submarkp && !mark_outp) mark_outp = submarkp;
-        }
-
-        if (mark) vertexp->asyncPath(true);
-        return mark_outp;
-    }
-
-    void dumpAsync(CdcVarVertex* vertexp, CdcEitherVertex* markp) {
-        const AstNode* const nodep = vertexp->varScp();
-        *m_ofp << "\n";
-        *m_ofp << "\n";
-        CdcEitherVertex* targetp = vertexp;  // One example destination flop (of possibly many)
-        for (V3GraphEdge* edgep = vertexp->outBeginp(); edgep; edgep = edgep->outNextp()) {
-            CdcEitherVertex* const eToVertexp = static_cast<CdcEitherVertex*>(edgep->top());
-            if (!eToVertexp) targetp = eToVertexp;
-            if (const CdcLogicVertex* const vvertexp = dynamic_cast<CdcLogicVertex*>(eToVertexp)) {
-                if (vvertexp->isFlop()  // IE the target flop that is upsetting us
-                    && edgep->weight() >= CDC_WEIGHT_ASYNC) {  // And var feeds an async reset line
-                    targetp = eToVertexp;
-                    // UINFO(9," targetasync  "<<targetp->name()<<" "<<" from
-                    // "<<vertexp->name()<<endl);
-                    break;
-                }
-            }  // else it might be random logic that's not relevant
-        }
-        // UINFO(9," finalflop  "<<targetp->name()<<" "<<targetp->nodep()->fileline()<<endl);
-        warnAndFile(markp->nodep(), V3ErrorCode::CDCRSTLOGIC,
-                    "Logic in path that feeds async reset, via signal: " + nodep->prettyNameQ());
-        dumpAsyncRecurse(targetp, "", "   ", 0);
-    }
-    bool dumpAsyncRecurse(CdcEitherVertex* vertexp, const string& prefix, const string& sep,
-                          int level) {
-        // level=0 is special, indicates to dump destination flop
-        // Return true if printed anything
-        // If mark, also mark the output even if nothing hazardous below
-        if (vertexp->user() >= m_userGeneration) return false;  // Processed - prevent loop
-        vertexp->user(m_userGeneration);
-        if (!vertexp->asyncPath() && level != 0) return false;  // Not part of path
-
-        // Other logic in the path
-        const string cont = prefix + sep;
-        string nextsep = "   ";
-        for (V3GraphEdge* edgep = vertexp->inBeginp(); edgep; edgep = edgep->inNextp()) {
-            CdcEitherVertex* const eFromVertexp = static_cast<CdcEitherVertex*>(edgep->fromp());
-            if (dumpAsyncRecurse(eFromVertexp, cont, nextsep, level + 1)) nextsep = " | ";
-        }
-
-        // Dump single variable/logic block
-        // See also OrderGraph::loopsVertexCb(V3GraphVertex* vertexp)
-        AstNode* const nodep = vertexp->nodep();
-        const string front
-            = pad(filelineWidth(), nodep->fileline()->ascii() + ":") + " " + prefix + " +- ";
-        if (VN_IS(nodep, VarScope)) {
-            *m_ofp << front << "Variable: " << nodep->prettyName() << '\n';
-        } else {
-            V3EmitV::verilogPrefixedTree(nodep, *m_ofp, prefix + " +- ", filelineWidth(),
-                                         vertexp->srcDomainp(), true);
-            if (debug()) { CdcDumpVisitor{nodep, m_ofp, front + "DBG: "}; }
-        }
-
-        nextsep = " | ";
-        if (level)
-            *m_ofp << V3OutFile::indentSpaces(filelineWidth()) << " " << prefix << nextsep << "\n";
-
-        if (CdcLogicVertex* const vvertexp = dynamic_cast<CdcLogicVertex*>(vertexp)) {
-            // Now that we've printed a path with this hazard, don't bother to print any more
-            // Otherwise, we'd get a path for almost every destination flop
-            vvertexp->clearHazard();
-        }
-        return true;
-    }
-
-    //----------------------------------------
-    // EDGE REPORTS
-
-    void edgeReport() {
-        // Make report of all signal names and what clock edges they have
-        //
-        // Due to flattening, many interesting direct-connect signals are
-        // lost, so we can't make a report showing I/Os for a low level
-        // module.  Disabling flattening though makes us consider each
-        // signal in it's own unique clock domain.
-
-        UINFO(3, __FUNCTION__ << ": " << endl);
-
-        // Trace all sources and sinks
-        for (const bool& traceDests : {false, true}) {
-            UINFO(9, " Trace Direction " << (traceDests ? "dst" : "src") << endl);
-            m_graph.userClearVertices();  // user1: bool - was analyzed
-            for (V3GraphVertex* itp = m_graph.verticesBeginp(); itp; itp = itp->verticesNextp()) {
-                if (CdcVarVertex* const vvertexp = dynamic_cast<CdcVarVertex*>(itp)) {
-                    UINFO(9, "   Trace One edge: " << vvertexp << endl);
-                    edgeDomainRecurse(vvertexp, traceDests, 0);
-                }
-            }
-        }
-
-        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';
-
-        std::deque<string> report;  // Sort output by name
-        for (V3GraphVertex* itp = m_graph.verticesBeginp(); itp; itp = itp->verticesNextp()) {
-            if (const CdcVarVertex* const vvertexp = dynamic_cast<CdcVarVertex*>(itp)) {
-                const AstVar* const varp = vvertexp->varScp()->varp();
-                {
-                    string what = "wire";
-                    if (varp->isPrimaryIO()) what = varp->direction().prettyName();
-
-                    std::ostringstream os;
-                    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
-                    const string fname = vvertexp->varScp()->fileline()->filebasename() + ":";
-                    os << "  " << std::setw(20) << fname;
-                    os << "  " << std::setw(8) << what;
-                    os << "  " << std::setw(40) << vvertexp->varScp()->prettyName();
-                    os << "  SRC=";
-                    if (vvertexp->srcDomainp()) {
-                        V3EmitV::verilogForTree(vvertexp->srcDomainp(), os);
-                    }
-                    os << "  DST=";
-                    if (vvertexp->dstDomainp()) {
-                        V3EmitV::verilogForTree(vvertexp->dstDomainp(), os);
-                    }
-                    os << std::setw(0);
-                    os << '\n';
-                    report.push_back(os.str());
-                }
-            }
-        }
-        stable_sort(report.begin(), report.end());
-        for (const auto& line : report) *ofp << line;
-    }
-
-    void edgeDomainRecurse(CdcEitherVertex* vertexp, bool traceDests, int level) {
-        // Scan back to inputs/outputs, flops, and compute clock domain information
-        UINFO(8, spaces(level) << "     Tracein  " << vertexp << endl);
-        if (vertexp->user() >= m_userGeneration) return;  // Mid-Processed - prevent loop
-        vertexp->user(m_userGeneration);
-
-        // Variables from flops already are domained
-        if (traceDests ? vertexp->dstDomainSet() : vertexp->srcDomainSet()) {
-            return;
-        }  // Fully computed
-
-        std::set<AstSenTree*> senouts;  // List of all sensitivities for new signal
-        if (dynamic_cast<CdcLogicVertex*>(vertexp)) {
-        } else if (const CdcVarVertex* const vvertexp = dynamic_cast<CdcVarVertex*>(vertexp)) {
-            // If primary I/O, give it domain of the input
-            const AstVar* const varp = vvertexp->varScp()->varp();
-            if (varp->isPrimaryIO() && varp->isNonOutput() && !traceDests) {
-                senouts.insert(new AstSenTree{
-                    varp->fileline(), new AstSenItem{varp->fileline(), AstSenItem::Combo{}}});
-            }
-        }
-
-        // Now combine domains of sources/dests
-        if (traceDests) {
-            for (V3GraphEdge* edgep = vertexp->outBeginp(); edgep; edgep = edgep->outNextp()) {
-                CdcEitherVertex* const eToVertexp = static_cast<CdcEitherVertex*>(edgep->top());
-                edgeDomainRecurse(eToVertexp, traceDests, level + 1);
-                if (eToVertexp->dstDomainp()) senouts.insert(eToVertexp->dstDomainp());
-            }
-        } else {
-            for (V3GraphEdge* edgep = vertexp->inBeginp(); edgep; edgep = edgep->inNextp()) {
-                CdcEitherVertex* const eFromVertexp
-                    = static_cast<CdcEitherVertex*>(edgep->fromp());
-                edgeDomainRecurse(eFromVertexp, traceDests, level + 1);
-                if (eFromVertexp->srcDomainp()) senouts.insert(eFromVertexp->srcDomainp());
-            }
-        }
-
-        // Convert list of senses into one sense node
-        AstSenTree* senoutp = nullptr;
-        bool senedited = false;
-        for (const auto& itr : senouts) {
-            if (!senoutp) {
-                senoutp = itr;
-            } else {
-                if (!senedited) {
-                    senedited = true;
-                    senoutp = senoutp->cloneTree(true);
-                }
-                senoutp->addSensesp(itr->sensesp()->cloneTree(true));
-            }
-        }
-        // If multiple domains need to do complicated optimizations
-        if (senedited) senoutp = VN_AS(V3Const::constifyExpensiveEdit(senoutp), SenTree);
-        if (traceDests) {
-            vertexp->dstDomainSet(true);  // Note it's set - domainp may be null, so can't use that
-            vertexp->dstDomainp(senoutp);
-            if (debug() >= 9) {
-                UINFO(9, spaces(level) + "     Tracedst " << vertexp);
-                if (senoutp) {
-                    V3EmitV::verilogForTree(senoutp, cout);
-                    cout << endl;
-                }
-            }
-        } else {
-            vertexp->srcDomainSet(true);  // Note it's set - domainp may be null, so can't use that
-            vertexp->srcDomainp(senoutp);
-            if (debug() >= 9) {
-                UINFO(9, spaces(level) + "     Tracesrc " << vertexp);
-                if (senoutp) {
-                    V3EmitV::verilogForTree(senoutp, cout);
-                    cout << endl;
-                }
-            }
-        }
-    }
-
-    // VISITORS
-    void visit(AstNodeModule* nodep) override {
-        VL_RESTORER(m_modp);
-        {
-            m_modp = nodep;
-            iterateChildren(nodep);
-        }
-    }
-    void visit(AstScope* nodep) override {
-        UINFO(4, " SCOPE " << nodep << endl);
-        m_scopep = nodep;
-        m_logicVertexp = nullptr;
-        iterateChildren(nodep);
-        m_scopep = nullptr;
-    }
-    void visit(AstActive* nodep) override {
-        // Create required blocks and add to module
-        UINFO(4, "  BLOCK  " << nodep << endl);
-        AstNode::user2ClearTree();
-        m_domainp = nodep->sensesp();
-        // Ignore static initializers, initial and final blocks
-        if (!m_domainp || m_domainp->hasCombo() || m_domainp->hasClocked()) {
-            iterateNewStmt(nodep);
-        }
-        m_domainp = nullptr;
-        AstNode::user2ClearTree();
-    }
-    void visit(AstNodeVarRef* nodep) override {
-        if (m_scopep) {
-            UASSERT_OBJ(m_logicVertexp, nodep, "Var ref not under a logic block");
-            AstVarScope* const varscp = nodep->varScopep();
-            UASSERT_OBJ(varscp, nodep, "Var didn't get varscoped in V3Scope.cpp");
-            CdcVarVertex* const varvertexp = makeVarVertex(varscp);
-            UINFO(5, " VARREF to " << varscp << endl);
-            // We use weight of one for normal edges,
-            // Weight of CDC_WEIGHT_ASYNC to indicate feeds async (for reporting)
-            // When simplify we'll take the MAX weight
-            if (nodep->access().isWriteOrRW()) {
-                new V3GraphEdge{&m_graph, m_logicVertexp, varvertexp, 1};
-                if (m_inDly) {
-                    varvertexp->fromFlop(true);
-                    varvertexp->srcDomainp(m_domainp);
-                    varvertexp->srcDomainSet(true);
-                }
-            } else {
-                if (varvertexp->cntAsyncRst()) {
-                    // UINFO(9," edgeasync "<<varvertexp->name()<<" to "<<m_logicVertexp<<endl);
-                    new V3GraphEdge{&m_graph, varvertexp, m_logicVertexp, CDC_WEIGHT_ASYNC};
-                } else {
-                    // UINFO(9," edgena    "<<varvertexp->name()<<" to "<<m_logicVertexp<<endl);
-                    new V3GraphEdge{&m_graph, varvertexp, m_logicVertexp, 1};
-                }
-            }
-        }
-    }
-    void visit(AstAssignDly* nodep) override {
-        VL_RESTORER(m_inDly);
-        m_inDly = true;
-        iterateChildren(nodep);
-        m_inDly = false;
-    }
-    void visit(AstSenItem* nodep) override {
-        m_inSenItem = true;
-        iterateChildren(nodep);
-        m_inSenItem = false;
-    }
-    void visit(AstAlways* nodep) override { iterateNewStmt(nodep); }
-    void visit(AstAlwaysPublic* nodep) override {
-        // CDC doesn't care about public variables
-    }
-    void visit(AstCFunc* nodep) override { iterateNewStmt(nodep); }
-    void visit(AstAssignAlias* nodep) override { iterateNewStmt(nodep); }
-    void visit(AstAssignW* nodep) override { iterateNewStmt(nodep); }
-
-    // Expressions that shouldn't cause us to clear hazard
-    void visit(AstConst*) override {}
-    void visit(AstReplicate* nodep) override { iterateChildren(nodep); }
-    void visit(AstConcat* nodep) override { iterateChildren(nodep); }
-    void visit(AstNot* nodep) override { iterateChildren(nodep); }
-    void visit(AstSel* nodep) override {
-        if (!VN_IS(nodep->lsbp(), Const)) setNodeHazard(nodep);
-        iterateChildren(nodep);
-    }
-    void visit(AstNodeSel* nodep) override {
-        if (!VN_IS(nodep->bitp(), Const)) setNodeHazard(nodep);
-        iterateChildren(nodep);
-    }
-
-    // Ignores
-    void visit(AstInitial*) override {}
-    void visit(AstInitialAutomatic*) override {}
-    void visit(AstInitialStatic*) override {}
-    void visit(AstTraceDecl*) override {}
-    void visit(AstCoverToggle*) override {}
-    void visit(AstNodeDType*) override {}
-
-    //--------------------
-    // Default
-    void visit(AstNodeExpr* nodep) override {
-        setNodeHazard(nodep);
-        iterateChildren(nodep);
-    }
-    void visit(AstNode* nodep) override { iterateChildren(nodep); }
-
-public:
-    // CONSTRUCTORS
-    explicit CdcVisitor(AstNode* nodep) {
-        // Make report of all signal names and what clock edges they have
-        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;
-        *m_ofp << "CDC Report for " << v3Global.opt.prefix() << '\n';
-        *m_ofp
-            << "Each dump below traces logic from inputs/source flops to destination flop(s).\n";
-        *m_ofp << "First source logic is listed, then a variable that logic generates,\n";
-        *m_ofp << "repeating recursively forwards to the destination flop(s).\n";
-        *m_ofp << "%% Indicates the operator considered potentially hazardous.\n";
-
-        iterate(nodep);
-        analyze();
-        if (debug() >= 1) edgeReport();  // Not useful to users at the moment
-        if (false) {
-            *m_ofp << "\nDBG-test-dumper\n";
-            V3EmitV::verilogPrefixedTree(nodep, *m_ofp, "DBG ", 40, nullptr, true);
-            *m_ofp << '\n';
-        }
-    }
-    ~CdcVisitor() override {
-        if (m_ofp) VL_DO_CLEAR(delete m_ofp, m_ofp = nullptr);
-    }
-};
-
-//######################################################################
-// Cdc class functions
-
-void V3Cdc::cdcAll(AstNetlist* nodep) {
-    UINFO(2, __FUNCTION__ << ": " << endl);
-    { CdcVisitor{nodep}; }
-}
@@ -27,6 +27,7 @@

 #include "V3Ast.h"
 #include "V3Global.h"
+#include "V3UniqueNames.h"

 VL_DEFINE_DEBUG_FUNCTIONS;

@@ -41,6 +42,7 @@ private:

    // MEMBERS
    string m_prefix;  // String prefix to add to name based on hier
+    V3UniqueNames m_names;  // For unique naming of structs and unions
    AstNodeModule* m_modp = nullptr;  // Current module
    AstNodeModule* m_classPackagep = nullptr;  // Package moving into
    const AstScope* m_classScopep = nullptr;  // Package moving scopes into
@@ -62,8 +64,10 @@ private:
        AstClassPackage* const packagep
            = new AstClassPackage{nodep->fileline(), nodep->origName()};
        packagep->name(nodep->name() + "__Vclpkg");
+        nodep->editCountInc();
        nodep->classOrPackagep(packagep);
        packagep->classp(nodep);
+        packagep->timeunit(nodep->timeunit());
        v3Global.rootp()->addModulesp(packagep);
        // Add package to hierarchy
        AstCell* const cellp = new AstCell{packagep->fileline(),
@@ -102,7 +106,6 @@ private:
            m_prefix = nodep->name() + "__02e";  // .
            iterateChildren(nodep);
        }
-        nodep->repairCache();
    }
    void visit(AstNodeModule* nodep) override {
        // Visit for NodeModules that are not AstClass (AstClass is-a AstNodeModule)
@@ -156,6 +159,11 @@ private:
        //    m_toScopeMoves.push_back(std::make_pair(nodep, m_classScopep));
        //}
    }
+    void visit(AstCoverDecl* nodep) override {
+        // Need to declare coverage in package, where we have access to symbol table
+        iterateChildren(nodep);
+        if (m_classPackagep) m_classPackagep->addStmtsp(nodep->unlinkFrBack());
+    }
    void visit(AstInitial* nodep) override {
        // But not AstInitialAutomatic, which remains under the class
        iterateChildren(nodep);
@@ -171,24 +179,27 @@ private:
        }
    }

-    void setStructModulep(AstStructDType* const dtypep) {
-        // Give it a pointer to its package and a final name
-        dtypep->classOrPackagep(m_modp);
-        dtypep->name(dtypep->name() + "__struct" + cvtToStr(dtypep->uniqueNum()));
+    void setStructModulep(AstNodeUOrStructDType* const dtypep) {
+        // Give struct a pointer to its package and a final name
+        dtypep->editCountInc();
+        dtypep->classOrPackagep(m_classPackagep ? m_classPackagep : m_modp);
+        dtypep->name(
+            m_names.get(dtypep->name() + (VN_IS(dtypep, UnionDType) ? "__union" : "__struct")));

        for (const AstMemberDType* itemp = dtypep->membersp(); itemp;
             itemp = VN_AS(itemp->nextp(), MemberDType)) {
-            AstStructDType* const subp = VN_CAST(itemp->skipRefp(), StructDType);
+            AstNodeUOrStructDType* const subp = itemp->getChildStructp();
            // Recurse only into anonymous unpacked structs inside this definition,
            // other unpacked structs will be reached from another typedefs
-            if (subp && !subp->packed() && subp->name().empty()) { setStructModulep(subp); }
+            if (subp && !subp->packed() && subp->name().empty()) setStructModulep(subp);
        }
    }
    void visit(AstTypedef* nodep) override {
        if (nodep->user1SetOnce()) return;
        iterateChildren(nodep);
+        if (m_classPackagep) m_classPackagep->addStmtsp(nodep->unlinkFrBack());

-        AstStructDType* const dtypep = VN_CAST(nodep->dtypep(), StructDType);
+        AstNodeUOrStructDType* const dtypep = VN_CAST(nodep->dtypep(), NodeUOrStructDType);
        if (dtypep && !dtypep->packed()) {
            dtypep->name(nodep->name());
            setStructModulep(dtypep);
@@ -237,5 +248,5 @@ public:
 void V3Class::classAll(AstNetlist* nodep) {
    UINFO(2, __FUNCTION__ << ": " << endl);
    { ClassVisitor{nodep}; }  // Destruct before checking
-    V3Global::dumpCheckGlobalTree("class", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("class", 0, dumpTreeLevel() >= 3);
 }
@@ -87,19 +87,21 @@ private:
    }
    void computeCppWidth(AstNode* nodep) {
        if (!nodep->user2() && nodep->hasDType()) {
-            if (VN_IS(nodep, Var)
+            if (VN_IS(nodep, Var)  //
+                || VN_IS(nodep, ConsPackMember)  //
                || VN_IS(nodep, NodeDType)  // Don't want to change variable widths!
                || VN_IS(nodep->dtypep()->skipRefp(), AssocArrayDType)  // Or arrays
                || VN_IS(nodep->dtypep()->skipRefp(), WildcardArrayDType)
                || VN_IS(nodep->dtypep()->skipRefp(), DynArrayDType)
                || VN_IS(nodep->dtypep()->skipRefp(), ClassRefDType)
                || VN_IS(nodep->dtypep()->skipRefp(), QueueDType)
+                || VN_IS(nodep->dtypep()->skipRefp(), StreamDType)
                || VN_IS(nodep->dtypep()->skipRefp(), UnpackArrayDType)
                || VN_IS(nodep->dtypep()->skipRefp(), VoidDType)) {
            } else {
-                const AstStructDType* const dtypep
-                    = VN_CAST(nodep->dtypep()->skipRefp(), StructDType);
-                if (!dtypep || dtypep->packed()) { setCppWidth(nodep); }
+                const AstNodeUOrStructDType* const dtypep
+                    = VN_CAST(nodep->dtypep()->skipRefp(), NodeUOrStructDType);
+                if (!dtypep || dtypep->packed()) setCppWidth(nodep);
            }
        }
    }
@@ -297,7 +299,11 @@ private:
    }
    void visit(AstWith* nodep) override {
        iterateChildren(nodep);
-        ensureCleanAndNext(nodep->exprp());
+        setClean(nodep, true);
+    }
+    void visit(AstCReturn* nodep) override {
+        iterateChildren(nodep);
+        ensureClean(nodep->lhsp());
        setClean(nodep, true);
    }
    void visit(AstIntfRef* nodep) override {
@@ -324,5 +330,5 @@ public:
 void V3Clean::cleanAll(AstNetlist* nodep) {
    UINFO(2, __FUNCTION__ << ": " << endl);
    { CleanVisitor{nodep}; }  // Destruct before checking
-    V3Global::dumpCheckGlobalTree("clean", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("clean", 0, dumpTreeLevel() >= 3);
 }
@@ -95,7 +95,7 @@ private:
        if (vscp->user1p()) return VN_AS(vscp->user1p(), VarScope);
        const AstVar* const varp = vscp->varp();
        const string newvarname
-            = string("__Vsampled__") + vscp->scopep()->nameDotless() + "__" + varp->name();
+            = string{"__Vsampled__"} + vscp->scopep()->nameDotless() + "__" + varp->name();
        FileLine* const flp = vscp->fileline();
        AstVar* const newvarp = new AstVar{flp, VVarType::MODULETEMP, newvarname, varp->dtypep()};
        newvarp->noReset(true);  // Reset by below assign
@@ -146,17 +146,19 @@ private:
        UASSERT_OBJ(nodep->hasClocked(), nodep, "Should have been converted by V3Sched");
        UASSERT_OBJ(nodep->stmtsp(), nodep, "Should not have been created if empty");

-        VNRelinker relinker;
-        nodep->unlinkFrBack(&relinker);
        AstNode* const stmtsp = nodep->stmtsp()->unlinkFrBackWithNext();

        // Create 'if' statement, if needed
        if (!m_lastSenp || !nodep->sensesp()->sameTree(m_lastSenp)) {
+            VNRelinker relinker;
+            nodep->unlinkFrBack(&relinker);
            clearLastSen();
            m_lastSenp = nodep->sensesp();
            // Make a new if statement
            m_lastIfp = makeActiveIf(m_lastSenp);
            relinker.relink(m_lastIfp);
+        } else {
+            nodep->unlinkFrBack();
        }

        // Move statements to if
@@ -222,5 +224,5 @@ public:
 void V3Clock::clockAll(AstNetlist* nodep) {
    UINFO(2, __FUNCTION__ << ": " << endl);
    { ClockVisitor{nodep}; }  // Destruct before checking
-    V3Global::dumpCheckGlobalTree("clock", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("clock", 0, dumpTreeLevel() >= 3);
 }
@@ -238,5 +238,5 @@ public:
 void V3Combine::combineAll(AstNetlist* nodep) {
    UINFO(2, __FUNCTION__ << ": " << endl);
    CombineVisitor::apply(nodep);
-    V3Global::dumpCheckGlobalTree("combine", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("combine", 0, dumpTreeLevel() >= 3);
 }
@@ -37,7 +37,7 @@ VL_DEFINE_DEBUG_FUNCTIONS;
 static void makeVlToString(AstClass* nodep) {
    AstCFunc* const funcp
        = new AstCFunc{nodep->fileline(), "VL_TO_STRING", nullptr, "std::string"};
-    funcp->argTypes("const VlClassRef<" + EmitCBaseVisitor::prefixNameProtect(nodep) + ">& obj");
+    funcp->argTypes("const VlClassRef<" + EmitCBase::prefixNameProtect(nodep) + ">& obj");
    funcp->isMethod(false);
    funcp->isConst(false);
    funcp->isStatic(false);
@@ -51,7 +51,7 @@ static void makeVlToString(AstClass* nodep) {
 static void makeVlToString(AstIface* nodep) {
    AstCFunc* const funcp
        = new AstCFunc{nodep->fileline(), "VL_TO_STRING", nullptr, "std::string"};
-    funcp->argTypes("const " + EmitCBaseVisitor::prefixNameProtect(nodep) + "* obj");
+    funcp->argTypes("const " + EmitCBase::prefixNameProtect(nodep) + "* obj");
    funcp->isMethod(false);
    funcp->isConst(false);
    funcp->isStatic(false);
@@ -61,11 +61,12 @@ static void makeVlToString(AstIface* nodep) {
    funcp->addStmtsp(new AstCReturn{nodep->fileline(), exprp});
    nodep->addStmtsp(funcp);
 }
-static void makeVlToString(AstStructDType* nodep) {
+static void makeVlToString(AstNodeUOrStructDType* nodep) {
    AstNodeModule* const modp = nodep->classOrPackagep();
+    UASSERT_OBJ(modp, nodep, "Unlinked struct package");
    AstCFunc* const funcp
        = new AstCFunc{nodep->fileline(), "VL_TO_STRING", nullptr, "std::string"};
-    funcp->argTypes("const " + EmitCBaseVisitor::prefixNameProtect(nodep) + "& obj");
+    funcp->argTypes("const " + EmitCBase::prefixNameProtect(nodep) + "& obj");
    funcp->isMethod(false);
    funcp->isConst(false);
    funcp->isStatic(false);
@@ -79,13 +80,15 @@ static void makeVlToString(AstStructDType* nodep) {
        } else {
            stmt += ", ";
        }
-        stmt += itemp->nameProtect() + ":\" + ";
+        stmt += VIdProtect::protect(itemp->prettyName()) + ":\" + ";
        if (VN_IS(itemp->dtypep()->skipRefp(), BasicDType) && itemp->isWide()) {
-            stmt += "VL_TO_STRING_W";
+            stmt += "VL_TO_STRING_W(";
+            stmt += cvtToStr(itemp->widthWords());
+            stmt += ", ";
        } else {
-            stmt += "VL_TO_STRING";
+            stmt += "VL_TO_STRING(";
        }
-        stmt += "(obj." + itemp->nameProtect() + ");\n";
+        stmt += "obj." + itemp->nameProtect() + ");\n";
        funcp->addStmtsp(new AstCStmt{nodep->fileline(), stmt});
    }
    funcp->addStmtsp(new AstCStmt{nodep->fileline(), "out += \"}\";\n"});
@@ -137,7 +140,7 @@ static void makeToStringMiddle(AstClass* nodep) {
        string stmt = "out += ";
        if (!comma.empty()) stmt += "\", \"+ ";
        // comma = ", ";  // Nothing further so not needed
-        stmt += EmitCBaseVisitor::prefixNameProtect(nodep->extendsp()->dtypep());
+        stmt += EmitCBase::prefixNameProtect(nodep->extendsp()->dtypep());
        stmt += "::to_string_middle();\n";
        nodep->user1(true);  // So what we extend dumps this
        funcp->addStmtsp(new AstCStmt{nodep->fileline(), stmt});
@@ -168,9 +171,9 @@ void V3Common::commonAll() {
    }
    for (AstNode* nodep = v3Global.rootp()->typeTablep()->typesp(); nodep;
         nodep = nodep->nextp()) {
-        if (AstStructDType* const dtypep = VN_CAST(nodep, StructDType)) {
+        if (AstNodeUOrStructDType* const dtypep = VN_CAST(nodep, NodeUOrStructDType)) {
            if (!dtypep->packed()) makeVlToString(dtypep);
        }
    }
-    V3Global::dumpCheckGlobalTree("common", 0, dumpTree() >= 3);
+    V3Global::dumpCheckGlobalTree("common", 0, dumpTreeLevel() >= 3);
 }
--- a/Show More
+++ b/Show More