Version bump

* Add tests for unpacked array in DPI-C

* Add more generic parameter generator to AstNodes

* Supports multi dimensional array in DPI ( DPI argmuments <=> Verilator internal type conversion)

consider typedef in V3Task

fix export test

fix inout for scalar

support export func of time

* V3Premit does not show an error for wide words nor ArraySel

* Unnecessary pack func for unapcked array does not appear anymore

* Support unpacked array in runtime header

- Add an overload for lvalue VL_CVT_PACK_STR_NN
- Allow conversion from void *

* touch up tests for codacy advices

* resolve free functions. no functional change intended.

.clang-tidy

@@ -1,4 +1,4 @@
-Checks:          'clang-diagnostic-*,clang-analyzer-*,*,-modernize*,-hicpp*,-android-cloexec-fopen,-cert-dcl50-cpp,-cert-env33-c,-cert-err34-c,-cert-err58-cpp,-clang-analyzer-core.UndefinedBinaryOperatorResult,-clang-analyzer-security*,-cppcoreguidelines-no-malloc,-cppcoreguidelines-owning-memory,-cppcoreguidelines-pro-bounds-array-to-pointer-decay,-cppcoreguidelines-pro-bounds-array-to-pointer-decay,-cppcoreguidelines-pro-bounds-constant-array-index,-cppcoreguidelines-pro-bounds-pointer-arithmetic,-cppcoreguidelines-pro-type-const-cast,-cppcoreguidelines-pro-type-reinterpret-cast,-cppcoreguidelines-pro-type-static-cast-downcast,-cppcoreguidelines-pro-type-union-access,-cppcoreguidelines-pro-type-vararg,-cppcoreguidelines-special-member-functions,-fuchsia-default-arguments,-fuchsia-overloaded-operator,-google-default-arguments,-google-readability-todo,-google-runtime-references,-llvm-header-guard,-llvm-include-order,-misc-string-integer-assignment,-misc-string-literal-with-embedded-nul,-readability-braces-around-statements,-readability-container-size-empty,-readability-delete-null-pointer,-readability-else-after-return,-readability-implicit-bool-conversion,-readability-named-parameter,-readability-static-accessed-through-instance'
+Checks:          '*,-hicpp*,-android-cloexec-fopen,-cert-dcl50-cpp,-cert-env33-c,-cert-err34-c,-cert-err58-cpp,-clang-analyzer-core.UndefinedBinaryOperatorResult,-clang-analyzer-security*,-cppcoreguidelines-avoid-magic-numbers,-cppcoreguidelines-no-malloc,-cppcoreguidelines-owning-memory,-cppcoreguidelines-pro-bounds-array-to-pointer-decay,-cppcoreguidelines-pro-bounds-array-to-pointer-decay,-cppcoreguidelines-pro-bounds-constant-array-index,-cppcoreguidelines-pro-bounds-pointer-arithmetic,-cppcoreguidelines-pro-type-const-cast,-cppcoreguidelines-pro-type-reinterpret-cast,-cppcoreguidelines-pro-type-static-cast-downcast,-cppcoreguidelines-pro-type-union-access,-cppcoreguidelines-pro-type-vararg,-cppcoreguidelines-special-member-functions,-fuchsia-*,-google-default-arguments,-google-readability-todo,-google-runtime-references,-llvm-header-guard,-llvm-include-order,-misc-string-integer-assignment,-misc-string-literal-with-embedded-nul,-modernize-use-auto,-modernize-use-trailing-return-type,-readability-braces-around-statements,-readability-container-size-empty,-readability-delete-null-pointer,-readability-else-after-return,-readability-implicit-bool-conversion,-readability-named-parameter,-readability-static-accessed-through-instance'
 WarningsAsErrors: ''
 HeaderFilterRegex: ''
 FormatStyle:     none

.travis.yml

@@ -85,7 +85,7 @@ jobs:
     # OS X build
     - {stage: build, if: type  = cron, os: osx, osx_image: xcode11.6, compiler: clang, workspaces: {create: {name: osx-xcode11.6, paths: .}}}
     # FreeBSD build
-    - {stage: build, if: type  = cron, os: freebsd, compiler: clang, workspaces: {create: {name: freebsd, paths: .}}}
+    #- {stage: build, if: type  = cron, os: freebsd, compiler: clang, workspaces: {create: {name: freebsd, paths: .}}}
     ############################################################################
     # Jobs in the 'test' stage
     ############################################################################
@@ -136,10 +136,10 @@ jobs:
     - {stage: test, if: type  = cron, os: osx, osx_image: xcode11.6, compiler: clang, workspaces: {use: osx-xcode11.6},  git: {clone: false}, env: TESTS=vltmt-0}
     - {stage: test, if: type  = cron, os: osx, osx_image: xcode11.6, compiler: clang, workspaces: {use: osx-xcode11.6},  git: {clone: false}, env: TESTS=vltmt-1}
     # FreeBSD tests
-    - {stage: test, if: type  = cron, os: freebsd, compiler: clang, workspaces: {use: freebsd}, git: {clone: false}, env: TESTS=dist-vlt-0}
-    - {stage: test, if: type  = cron, os: freebsd, compiler: clang, workspaces: {use: freebsd}, git: {clone: false}, env: TESTS=dist-vlt-1}
-    - {stage: test, if: type  = cron, os: freebsd, compiler: clang, workspaces: {use: freebsd}, git: {clone: false}, env: TESTS=vltmt-0}
-    - {stage: test, if: type  = cron, os: freebsd, compiler: clang, workspaces: {use: freebsd}, git: {clone: false}, env: TESTS=vltmt-1}
+    #- {stage: test, if: type  = cron, os: freebsd, compiler: clang, workspaces: {use: freebsd}, git: {clone: false}, env: TESTS=dist-vlt-0}
+    #- {stage: test, if: type  = cron, os: freebsd, compiler: clang, workspaces: {use: freebsd}, git: {clone: false}, env: TESTS=dist-vlt-1}
+    #- {stage: test, if: type  = cron, os: freebsd, compiler: clang, workspaces: {use: freebsd}, git: {clone: false}, env: TESTS=vltmt-0}
+    #- {stage: test, if: type  = cron, os: freebsd, compiler: clang, workspaces: {use: freebsd}, git: {clone: false}, env: TESTS=vltmt-1}
 
 notifications:
   email:

Changes

@@ -3,6 +3,95 @@ Revision history for Verilator
 The contributors that suggested a given feature are shown in []. Thanks!
 
 
+* Verilator 4.106 2020-12-02
+
+**    Change -sv option to select 1800-2017 instead of 1800-2005.
+
+***   Check for proper 'local' and 'protected' (#2228).
+
+***   Support $random and $urandom seeds.
+
+***   Support $monitor and $strobe.
+
+***   Support complex function arguments.
+
+***   Support 'super'.
+
+***   Support 'with item.index'.
+
+****  Fix the default GNU Make executable name on FreeBSD (#2553). [Yuri Victorovich]
+
+****  Fix trace signal names getting hashed (#2643).  [Barbara Gigerl]
+
+****  Fix unpacked array parameters near functions (#2639). [Anderson Ignacio da Silva]
+
+****  Fix access to non-overridden base class variable (#2654). [Tobias Rosenkranz]
+
+
+* Verilator 4.104 2020-11-14
+
+***   Support queue and associative array 'with' statements (#2616).
+
+***   Support queue slicing (#2326).
+
+***   Support associative array pattern assignments and defaults.
+
+***   Support static methods and typedefs in classes (#2615). [Krzysztof Bieganski]
+
+****  Report error on typedef referencing self (#2539). [Cody Piersall]
+
+****  With --debug, turn off address space layout randomization.
+
+****  Fix iteration over mutating list bug in VPI (#2588). [Kaleb Barrett]
+
+****  Fix cast width propagation (#2597). [flex-liu]
+
+****  Fix return from callValueCbs (#2589) (#2605). [Marlon James]
+
+****  Fix WIDTH warnings on comparisons with nullptr (#2602). [Rupert Swarbrick]
+
+****  Fix fault when $fgets, $sscanf, etc used with string (#2604). [Yutetsu TAKATSUKASA]
+
+****  Fix WIFEXITED missing from MinGW/MSYS2 (#2609). [Jean Berniolles]
+
+****  Fix queue poping wrong value when otherwise unused (#2512). [nanduraj1]
+
+****  Fix arrays of modport interfaces (#2614). [Thierry Tambe]
+
+****  Fix split_var internal error (#2640) (#2641). [Yutetsu TAKATSUKASA]
+
+
+* Verilator 4.102 2020-10-15
+
+****  Support const object new() assignments.
+
+****  Support # as a comment in -f files (#2497). [phantom-killua]
+
+****  Support 'this' (#2585). [Rafal Kapuscik]
+
+****  Support defines for FST tracing (#2592). [Markus Krause]
+
+****  Support |=> inside properties (#1292). [Peter Monsson]
+
+****  Fix timescale with --hierarchical (#2554). [Yutetsu TAKATSUKASA]
+
+****  Fix cmake build with --hierarchical (#2560). [Yutetsu TAKATSUKASA]
+
+****  Fix -G dropping public indication (#2561). [Andrew Goessling]
+
+****  Fix $urandom_range passed variable (#2563). [nanduraj1]
+
+****  Fix method calls to package class functions (#2565). [Peter Monsson]
+
+****  Fix class wide member display (#2567). [Nandu Raj P]
+
+****  Fix hierarchical references inside function (#2267) (#2572). [James Pallister]
+
+****  Fix flushCall for backward compatibility (#2580). [chenguokai]
+
+****  Fix preprocessor stringify of undefined macro. [Martin Whitaker]
+
+
 * Verilator 4.100 2020-09-07
 
 **    C++11 or newer compilers are now required.
@@ -27,6 +116,8 @@ The contributors that suggested a given feature are shown in []. Thanks!
 
 ****  Add support for assume property. [Peter Monsson]
 
+****  Add support for |=> inside properties (#1292). [Peter Monsson]
+
 
 * Verilator 4.040 2020-08-15
 

MANIFEST.SKIP

@@ -66,4 +66,5 @@ ci/
 /csrc/
 obj_dir.*
 TAGS
+gmon.out
 .*~

Makefile.in

@@ -170,6 +170,8 @@ DISTFILES_INC = $(INFOS) .gitignore \
 	test_regress/t/t*/*.v* \
 	test_regress/t/t*/*/*.sv* \
 	test_regress/t/t*/*/*.v* \
+	test_regress/t/t*/*.cpp \
+	test_regress/t/t*/CMakeLists.txt \
 	test_regress/t/*.cpp \
 	test_regress/t/*.h \
 	test_regress/t/*.dat \
@@ -440,15 +442,16 @@ cppcheck: $(CPPCHECK_DEP)
 	$(CPPCHECK) $(CPPCHECK_FLAGS) -DVL_DEBUG=1 -DVL_CPPCHECK=1 -DVL_THREADED=1 $(CPPCHECK_INC) $<
 
 CLANGTIDY = clang-tidy
-CLANGTIDY_FLAGS = -config=''
+CLANGTIDY_FLAGS = -config='' -checks='-fuchsia-*,-cppcoreguidelines-avoid-c-arrays,-cppcoreguidelines-init-variables'
 CLANGTIDY_DEP = $(subst .h,.h.tidy,$(CPPCHECK_H)) \
 	$(subst .cpp,.cpp.tidy,$(CPPCHECK_CPP))
+CLANGTIDY_DEFS = -DVL_DEBUG=1 -DVL_THREADED=1 -DVL_CPPCHECK=1
 
-clangtidy: $(CLANGTIDY_DEP)
+clang-tidy: $(CLANGTIDY_DEP)
 %.cpp.tidy: %.cpp
-	$(CLANGTIDY) $(CLANGTIDY_FLAGS) $< -- -DVL_DEBUG=1 -DVL_CPPCHECK=1 $(CPPCHECK_INC) | 2>&1 tee $@
+	$(CLANGTIDY) $(CLANGTIDY_FLAGS) $< -- $(CLANGTIDY_DEFS) $(CPPCHECK_INC) | 2>&1 tee $@
 %.h.tidy: %.h
-	$(CLANGTIDY) $(CLANGTIDY_FLAGS) $< -- -DVL_DEBUG=1 -DVL_CPPCHECK=1 $(CPPCHECK_INC) | 2>&1 tee $@
+	$(CLANGTIDY) $(CLANGTIDY_FLAGS) $< -- $(CLANGTIDY_DEFS) $(CPPCHECK_INC) | 2>&1 tee $@
 
 analyzer-src:
 	-rm -rf src/obj_dbg
@@ -460,11 +463,12 @@ analyzer-include:
 
 CLANGFORMAT = clang-format
 CLANGFORMAT_FLAGS = -i
+CLANGFORMAT_FILES = $(CPPCHECK_CPP) $(CPPCHECK_H) $(CPPCHECK_YL) test_regress/t/*.c*
 
 clang-format:
 	@$(CLANGFORMAT) --version | egrep 10.0 > /dev/null \
 		|| echo "*** You are not using clang-format 10.0, indents may differ from master's ***"
-	$(CLANGFORMAT) $(CLANGFORMAT_FLAGS) $(CPPCHECK_CPP) $(CPPCHECK_H) $(CPPCHECK_YL)
+	$(CLANGFORMAT) $(CLANGFORMAT_FLAGS) $(CLANGFORMAT_FILES)
 
 ftp: info
 

bin/verilator

@@ -76,7 +76,8 @@ if ($opt_gdbbt && !gdb_works()) {
 my @quoted_sw = map {sh_escape($_)} @Opt_Verilator_Sw;
 if ($opt_gdb) {
     # Generic GDB interactive
-    run (($ENV{VERILATOR_GDB}||"gdb")
+    run (aslr_off()
+         .($ENV{VERILATOR_GDB}||"gdb")
          ." ".verilator_bin()
          # Note, uncomment to set breakpoints before running:
          #  ." -ex 'break main'"
@@ -91,16 +92,22 @@ if ($opt_gdb) {
          ." -ex 'bt'");
 } elsif ($opt_rr) {
     # Record with rr
-    run ("rr record ".verilator_bin()
+    run (aslr_off()
+         ."rr record ".verilator_bin()
          ." ".join(' ', @quoted_sw));
 } elsif ($opt_gdbbt && $Debug) {
     # Run under GDB to get gdbbt
-    run ("gdb"
+    run (aslr_off()
+         ."gdb"
          ." ".verilator_bin()
          ." --batch --quiet --return-child-result"
          ." -ex \"run ".join(' ', @quoted_sw)."\""
          ." -ex 'set width 0'"
          ." -ex 'bt' -ex 'quit'");
+} elsif ($Debug) {
+    # Debug
+    run(aslr_off()
+        .verilator_bin()." ".join(' ',@quoted_sw));
 } else {
     # Normal, non gdb
     run(verilator_bin()." ".join(' ',@quoted_sw));
@@ -165,6 +172,15 @@ sub gdb_works {
     return $status==0;
 }
 
+sub aslr_off {
+    my $ok = `setarch --addr-no-randomize echo ok 2>/dev/null` || "";
+    if ($ok =~ /ok/) {
+        return "setarch --addr-no-randomize ";
+    } else {
+        return "";
+    }
+}
+
 sub run {
     # Run command, check errors
     my $command = shift;
@@ -1445,7 +1461,7 @@ future version of Verilator no longer always packs unpacked structures.
 =item -sv
 
 Specifies SystemVerilog language features should be enabled; equivalent to
-"--language 1800-2005".  This option is selected by default, it exists for
+"--language 1800-2017".  This option is selected by default, it exists for
 compatibility with other simulators.
 
 =item  +systemverilogext+I<ext>
@@ -1980,14 +1996,15 @@ section below for descriptions of some of the files that were created.
 
 (Verilator included a default compile rule and link rule, since we used
 --exe and passed a .cpp file on the Verilator command line.  Verilator also
-then used C<make> to build a final executable.  You can also write your own
-compile rules, and run make yourself as we'll show in the SYSTEMC section.)
+then used C<make> to build a final executable, since we used --build.  You
+can also write your own compile rules, and run make yourself as we'll show
+in the SYSTEMC section.
 
-And now we run it
+And now we run it:
 
     obj_dir/Vour
 
-And we get as output
+And we get as output:
 
     Hello World
     - our.v:2: Verilog $finish
@@ -4075,9 +4092,10 @@ is ignored, only a single trace file may be active at once.
 $dumpall/$dumpportsall, $dumpon/$dumpportson, $dumpoff/$dumpportsoff, and
 $dumplimit/$dumpportlimit are currently ignored.
 
-=item $finish, $stop
+=item $exit, $finish, $stop
 
-The rarely used optional parameter to $finish and $stop is ignored.
+The rarely used optional parameter to $finish and $stop is ignored. $exit
+is aliased to $finish.
 
 =item $fopen, $fclose, $fdisplay, $ferror, $feof, $fflush, $fgetc, $fgets,
 $fscanf, $fwrite, $fscanf, $sscanf
@@ -4089,17 +4107,12 @@ $setup, $setuphold, $skew, $timeskew, $width
 
 All specify blocks and timing checks are ignored.
 
-=item $monitor, $strobe
-
-Monitor and strobe are not supported, convert to always_comb $display or
-similar.
-
 =item $random, $urandom, $urandom_range
 
-$random and $urandom do not support the optional argument to set the seed.
-Use +verilator+seed argument to set the seed.  There is one random seed per
-C thread, not per module for $random, nor per object for random stability
-of $urandom/$urandom_range.
+Use +verilator+seed argument to set the seed if there is no $random or
+$urandom optional argument to set the seed.  There is one random seed per C
+thread, not per module for $random, nor per object for random stability of
+$urandom/$urandom_range.
 
 =item $readmemb, $readmemh
 

bin/verilator_difftree

@@ -9,22 +9,6 @@ use Pod::Usage;
 use strict;
 use vars qw($Debug);
 
-#======================================================================
-
-# Old version 1 dump nodes with no dtypep's
-our %Ver1_Non_Dtyped = map {$_ => 1} qw(
-  ACTIVE ALWAYS ALWAYSPOST ALWAYSPUBLIC ATTROF BEGIN BREAK CASE CASEITEM
-  CCALL CELL CELLINLINE CFILE CFUNC CHANGEDET CLOCKING COMMENT CONTINUE
-  COVERDECL COVERINC COVERTOGGLE CRETURN CSTMT DEFPARAM DISABLE DISPLAY DOT
-  DPIEXPORT FCLOSE FFLUSH FINAL FINISH FOPEN GENCASE GENERATE GENFOR GENIF
-  IF IMPLICIT INITARRAY INITIAL JUMPGO JUMPLABEL MODULE NETLIST
-  NOTFOUNDMODULE PACKAGE PACKAGEIMPORT PARSEREF PIN PORT PRAGMA PRIMITIVE
-  PSLASSERT PSLCOVER PSLDEFCLOCK PULL RANGE READMEM REPEAT RETURN SCCTOR
-  SCDTOR SCHDR SCIMP SCIMPHDR SCINT SCOPE SELBIT SELEXTRACT SELMINUS
-  SELPLUS SENGATE SENITEM SENTREE SFORMAT SFORMATF STOP SYSIGNORE SYSTEMT
-  TASK TASKREF TEXT TOPSCOPE TYPEDEFFWD TYPETABLE UCSTMT UDPTABLE
-  UDPTABLELINE UNTILSTABLE VASSERT WHILE );
-
 #======================================================================
 # main
 
@@ -133,8 +117,6 @@ sub filter {
         $line =~ s/{[a-z]*\d+}/{}/g if !$Opt_Lineno;
         if ($verCvt) {
             next if $line =~ /^     NETLIST/;
-            $line =~ s!\@dt=0x\(G?/?([^)]+)\)!$1!g;  # NEW: @dt -> OLD: non @dt format
-            #                                        # Below Ver1_Non_Dtyped may replace above further
             if ($line =~ /: ([A-Z]+) /) {
                 my $type = $1;
                 next if $type =~ 'DTYPE';
@@ -147,14 +129,7 @@ sub filter {
                     }
                     next;
                 }
-                if ($Ver1_Non_Dtyped{$type}) {
-                    $line =~ s! w[0-9]+!!g;
-                }
             }
-            $line =~ s!\@dt=0$!NoW!g;   # NEW: dt=null -> common format
-            $line =~ s!\@dt=0 !NoW !g;  # NEW: dt=null -> common format
-            $line =~ s! s?w0$! NoW!g;   # OLD: no width -> common format
-            $line =~ s! s?w0 ! NoW !g;  # OLD: no width -> common format
         }
         print $f2 $line;
     }

bin/verilator_gantt

@@ -60,6 +60,7 @@ sub process {
     my $filename = shift;
 
     read_data($filename);
+    read_cpuinfo();
     report();
 }
 
@@ -70,7 +71,7 @@ sub read_data {
 
     %Global = (rdtsc_cycle_time => 0);
 
-    my $fh = IO::File->new ($filename) or die "%Error: $! $filename,";
+    my $fh = IO::File->new("<$filename") or die "%Error: $! $filename,";
     while (my $line = $fh->getline) {
         if ($line =~ m/VLPROF mtask\s(\d+)\sstart\s(\d+)\send\s(\d+)\selapsed\s(\d+)\spredict_time\s(\d+)\scpu\s(\d+)\son thread (\d+)/) {
             my $mtask = $1;
@@ -113,6 +114,27 @@ sub read_data {
     }
 }
 
+sub read_cpuinfo {
+    my $filename = "/proc/cpuinfo";
+    my $fh = IO::File->new("<$filename") or return;
+    my $cpu;
+    while (my $line = $fh->getline) {
+        chomp $line;
+        if ($line =~ m/^processor\s*:\s*(\d+)\s*$/) {
+            $cpu = $1;
+        }
+        if ($cpu && $line =~ m/^([a-z_ ]+)\s*:\s*(.*)$/) {
+            my ($term, $value) = ($1, $2);
+            $term =~ s/\s+$//;
+            $term =~ s/\s+/_/;
+            $value =~ s/\s+$//;
+            $Global{cpuinfo}{$cpu}{$term} = $value;
+        }
+    }
+}
+
+#######################################################################
+
 sub report {
     print "Verilator Gantt report\n";
 
@@ -156,14 +178,15 @@ sub report {
     print "\nAnalysis:\n";
     printf "  Total threads             = %d\n", $nthreads;
     printf "  Total mtasks              = %d\n", scalar(keys %Mtasks);
-    printf "  Total cpus used           = %d\n", scalar(keys %{$Global{cpus}});
+    my $ncpus = scalar(keys %{$Global{cpus}});
+    printf "  Total cpus used           = %d\n", $ncpus;
     printf "  Total yields              = %d\n", $Global{stats}{yields};
     printf "  Total eval time           = %d rdtsc ticks\n", $Global{last_end};
     printf "  Longest mtask time        = %d rdtsc ticks\n", $long_mtask_time;
     printf "  All-thread mtask time     = %d rdtsc ticks\n", $mt_mtask_time;
-    my $long_efficiency = $long_mtask_time/($Global{last_end});
+    my $long_efficiency = $long_mtask_time/($Global{last_end} || 1);
     printf "  Longest-thread efficiency = %0.1f%%\n", $long_efficiency*100;
-    my $mt_efficiency = $mt_mtask_time/($Global{last_end}*$nthreads);
+    my $mt_efficiency = $mt_mtask_time/($Global{last_end}*$nthreads || 1);
     printf "  All-thread efficiency     = %0.1f%%\n", $mt_efficiency*100;
     printf "  All-thread speedup        = %0.1f\n", $mt_efficiency*$nthreads;
     if ($Global{rdtsc_cycle_time} > 0) {
@@ -197,17 +220,72 @@ sub report {
     }
 
     print "\nStatistics:\n";
-    print "  min log(p2e) = $min_p2e  from mtask $min_mtask (predict $Mtasks{$min_mtask}{predict}, elapsed $Mtasks{$min_mtask}{elapsed})\n";
-    print "  max log(p2e) = $max_p2e  from mtask $max_mtask (predict $Mtasks{$max_mtask}{predict}, elapsed $Mtasks{$max_mtask}{elapsed})\n";
+    printf "  min log(p2e) = %0.3f", $min_p2e;
+    print "  from mtask $min_mtask (predict $Mtasks{$min_mtask}{predict},";
+    print " elapsed $Mtasks{$min_mtask}{elapsed})\n";
+    printf "  max log(p2e) = %0.3f", $max_p2e;
+    print "  from mtask $max_mtask (predict $Mtasks{$max_mtask}{predict},";
+    print " elapsed $Mtasks{$max_mtask}{elapsed})\n";
 
     my $stddev = stddev(\@p2e_ratios);
     my $mean = mean(\@p2e_ratios);
-    print "  mean = " . ($mean) . "\n";
-    print "  stddev = " . ($stddev) . "\n";
-    print "  e ^ stddev = " . exp($stddev). "\n";
+    printf "  mean = %0.3f\n", $mean;
+    printf "  stddev = %0.3f\n", $stddev;
+    printf "  e ^ stddev = %0.3f\n", exp($stddev);
+
+    report_cpus();
+
+    if ($nthreads > $ncpus) {
+        print "\n";
+        print "%Warning: There were fewer CPUs ($ncpus) then threads ($nthreads).\n";
+        print "        : See docs on use of numactl.\n";
+    } else {
+        if ($Global{cpu_socket_cores_warning}) {
+            print "\n";
+            print "%Warning: Multiple threads scheduled on same hyperthreaded core.\n";
+            print "        : See docs on use of numactl.\n";
+        }
+        if ($Global{cpu_sockets_warning}) {
+            print "\n";
+            print "%Warning: Threads scheduled on multiple sockets.\n";
+            print "        : See docs on use of numactl.\n";
+        }
+    }
     print "\n";
 }
 
+sub report_cpus {
+    print "\nCPUs:\n";
+    # Test - show all cores
+    # for (my $i=0; $i<73; ++$i) { $Global{cpus}{$i} ||= {cpu_time => 0}; }
+
+    $Global{cpu_sockets} ||= {};
+    $Global{cpu_socket_cores} ||= {};
+
+    foreach my $cpu (sort {$a <=> $b} keys %{$Global{cpus}}) {
+        printf "  cpu %d: ", $cpu;
+        printf "cpu_time=%d", $Global{cpus}{$cpu}{cpu_time};
+
+        my $socket = $Global{cpuinfo}{$cpu}{physical_id};
+        $Global{cpu_sockets}{$socket}++ if defined $socket;
+        printf " socket=%d", $socket if defined $socket;
+
+        my $core = $Global{cpuinfo}{$cpu}{core_id};
+        $Global{cpu_socket_cores}{$socket."__".$core}++ if defined $socket && defined $core;
+        printf " core=%d", $core if defined $core;
+
+        my $model = $Global{cpuinfo}{$cpu}{model_name};
+        printf "  %s", $model if defined $model;
+        print "\n";
+    }
+
+    $Global{cpu_sockets_warning} = 1
+        if (scalar keys %{$Global{cpu_sockets}} > 1);
+    foreach my $scn (values %{$Global{cpu_socket_cores}}) {
+        $Global{cpu_socket_cores_warning} = 1 if $scn > 1;
+    }
+}
+
 sub report_graph {
     my $time_per = $Opt_Time_Per_Char;
     if ($time_per == 0) {
@@ -219,6 +297,7 @@ sub report_graph {
         }
         # One more step so we can fit more labels
         $time_per = int($time_per/2);
+        $time_per ||= 1;
     }
 
     my ($graph, $conflicts) = _make_graph($time_per);

ci/docker/buildenv/Dockerfile

@@ -40,7 +40,7 @@ RUN apt-get update \
 
 WORKDIR /tmp
 
-RUN cpan install -fi Unix::Processors Parallel::Forker Bit::Vector
+RUN cpan install -fi Unix::Processors Parallel::Forker
 
 RUN git clone https://github.com/veripool/vcddiff.git && \
     make -C vcddiff && \

ci/travis-install.bash

@@ -94,7 +94,6 @@ elif [ "$TRAVIS_BUILD_STAGE_NAME" = "test" ]; then
   if [ "$TRAVIS_DIST" != "trusty" ]; then
     TRAVIS_CPAN_REPO=https://cpan.org
   fi
-  # Not listing Bit::Vector as slow to install, and only skips one test
   yes yes | sudo cpan -M $TRAVIS_CPAN_REPO -fi Unix::Processors Parallel::Forker
   install-vcddiff
 else

configure.ac

@@ -7,7 +7,7 @@
 
 #AC_INIT([Verilator],[#.### YYYY-MM-DD])
 #AC_INIT([Verilator],[#.### devel])
-AC_INIT([Verilator],[4.100 2020-09-07],
+AC_INIT([Verilator],[4.106 2020-12-02],
         [https://verilator.org],
         [verilator],[https://verilator.org])
 # When releasing, also update header of Changes file

docs/CONTRIBUTORS

@@ -25,20 +25,26 @@ Iztok Jeras
 James Hanlon
 James Hutchinson
 Jamey Hicks
+James Pallister
 Jan Van Winkel
+Jean Berniolles
 Jeremy Bennett
 John Coiner
 John Demme
 Josh Redford
 Julien Margetts
+Kaleb Barrett
 Kanad Kanhere
 Kevin Kiningham
+Krzysztof Bieganski
 Kuba Ober
 Ludwig Rogiers
 Lukasz Dalek
 Maarten De Braekeleer
 Maciej Sobkowski
 Marco Widmer
+Markus Krause
+Marlon James
 Marshal Qiao
 Matthew Ballance
 Michael Killough
@@ -52,6 +58,7 @@ Philipp Wagner
 Pieter Kapsenberg
 Piotr Binkowski
 Qingyao Sun
+Rafal Kapuscik
 Richard Myers
 Rupert Swarbrick
 Sean Cross
@@ -65,6 +72,7 @@ Tobias Wölfel
 Todd Strader
 Tomasz Gorochowik
 Tymoteusz Blazejczyk
+Victor Besyakov
 Vassilis Papaefstathiou
 Veripool API Bot
 Wilson Snyder

docs/install.adoc

@@ -102,7 +102,6 @@ Those developing Verilator itself may also want these (see internals.adoc):
    cpan install Pod::Perldoc
    cpan install Unix::Processors
    cpan install Parallel::Forker
-   cpan install Bit::Vector
 
 ==== Install SystemC
 

docs/internals.adoc

@@ -586,7 +586,7 @@ dealing with. For example a visitor might not implement separate `visit`
 methods for `AstIf` and `AstGenIf`, but just a single method for the base
 class:
 
-   void visit (AstNodeIf* nodep)
+   void visit(AstNodeIf* nodep)
 
 However that method might want to specify additional code if it is called
 for `AstGenIf`. Verilator does this by providing a `VN_IS` method for each
@@ -628,8 +628,6 @@ https://github.com/veripool/vcddiff
 
 * Cmake for build paths that use it.
 
-* Bit::Vector to test vgen.pl
-
 === Controlling the Test Driver
 
 Test drivers are written in PERL. All invoke the main test driver script,
@@ -672,7 +670,7 @@ Set to 1 to indicate that the compilation or execution is intended to fail.
 For example the following would specify that compilation requires two
 defines and is expected to fail.
 
-   compile (
+   compile(
       verilator_flags2 => ["-DSMALL_CLOCK -DGATED_COMMENT"],
       fails => 1,
       );
@@ -758,6 +756,15 @@ may be required to setup the system for fuzzing.
 
 == Debugging
 
+=== Debug Levels
+
+The "UINFO" calls in the source indicate a debug level. Messages level 3
+and below are globally enabled with `--debug`. Higher levels may be
+controlled with `--debugi <level>`.  An individual source file levels may
+be controlled with `-debugi-<srcfile> <level>`.  For example `--debug
+--debugi 5 --debugi-V3Width 9` will use the debug binary at default 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
@@ -950,9 +957,9 @@ Then, when the watch fires, to break at every following change to that node:
 To print a node:
 
    pn nodep
-   # or: call nodep->dumpGdb()  # aliased to "pn" in src/.gdbinit
+   # or: call dumpGdb(nodep)  # aliased to "pn" in src/.gdbinit
    pnt nodep
-   # or: call nodep->dumpTreeGdb()  # aliased to "pnt" in src/.gdbinit
+   # or: call dumpTreeGdb(nodep)  # aliased to "pnt" in src/.gdbinit
 
 When GDB halts, it is useful to understand that the backtrace will commonly
 show the iterator functions between each invocation of `visit` in the

include/verilated.cpp

@@ -61,7 +61,7 @@ typedef union {
 // Global variables
 
 // Slow path variables
-VerilatedMutex Verilated::m_mutex;
+VerilatedMutex Verilated::s_mutex;
 
 // Keep below together in one cache line
 Verilated::Serialized Verilated::s_s;
@@ -75,7 +75,7 @@ VerilatedImp::VerilatedImpU VerilatedImp::s_s;
 struct VerilatedImpInitializer {
     VerilatedImpInitializer() { VerilatedImp::setup(); }
     ~VerilatedImpInitializer() { VerilatedImp::teardown(); }
-} g_VerilatedImpInitializer;
+} s_VerilatedImpInitializer;
 
 //===========================================================================
 // User definable functions
@@ -256,6 +256,7 @@ Verilated::Serialized::Serialized() {
     s_errorLimit = 1;
     s_randReset = 0;
     s_randSeed = 0;
+    s_randSeedEpoch = 1;
     s_timeunit = VL_TIME_UNIT;  // Initial value until overriden by _Vconfigure
     s_timeprecision = VL_TIME_PRECISION;  // Initial value until overriden by _Vconfigure
 }
@@ -279,6 +280,8 @@ void* Verilated::serialized2Ptr() VL_MT_UNSAFE { return &VerilatedImp::s_s.v.m_s
 static vluint32_t vl_sys_rand32() VL_MT_UNSAFE {
     // Return random 32-bits using system library.
     // Used only to construct seed for Verilator's PNRG.
+    static VerilatedMutex s_mutex;
+    const VerilatedLockGuard lock(s_mutex);  // Otherwise rand is unsafe
 #if defined(_WIN32) && !defined(__CYGWIN__)
     // Windows doesn't have lrand48(), although Cygwin does.
     return (rand() << 16) ^ rand();
@@ -288,29 +291,18 @@ static vluint32_t vl_sys_rand32() VL_MT_UNSAFE {
 }
 
 vluint64_t vl_rand64() VL_MT_SAFE {
-    static VerilatedMutex s_mutex;
-    static VL_THREAD_LOCAL bool t_seeded = false;
+    static VL_THREAD_LOCAL vluint32_t t_seedEpoch = 0;
     static VL_THREAD_LOCAL vluint64_t t_state[2];
-    if (VL_UNLIKELY(!t_seeded)) {
-        t_seeded = true;
-        {
-            const VerilatedLockGuard lock(s_mutex);
-            if (Verilated::randSeed() != 0) {
-                t_state[0] = ((static_cast<vluint64_t>(Verilated::randSeed()) << 32)
-                              ^ (static_cast<vluint64_t>(Verilated::randSeed())));
-                t_state[1] = ((static_cast<vluint64_t>(Verilated::randSeed()) << 32)
-                              ^ (static_cast<vluint64_t>(Verilated::randSeed())));
-            } else {
-                t_state[0] = ((static_cast<vluint64_t>(vl_sys_rand32()) << 32)
-                              ^ (static_cast<vluint64_t>(vl_sys_rand32())));
-                t_state[1] = ((static_cast<vluint64_t>(vl_sys_rand32()) << 32)
-                              ^ (static_cast<vluint64_t>(vl_sys_rand32())));
-            }
-            // 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];
-        }
+    // For speed, we use a thread-local epoch number to know when to reseed
+    if (VL_UNLIKELY(t_seedEpoch != Verilated::randSeedEpoch())) {
+        // Set epoch before state, in case races with new seeding
+        t_seedEpoch = Verilated::randSeedEpoch();
+        t_state[0] = Verilated::randSeedDefault64();
+        t_state[1] = t_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];
     }
     // Xoroshiro128+ algorithm
     vluint64_t result = t_state[0] + t_state[1];
@@ -334,6 +326,11 @@ WDataOutP VL_RANDOM_W(int obits, WDataOutP outwp) VL_MT_SAFE {
 }
 // LCOV_EXCL_STOP
 
+IData VL_RANDOM_SEEDED_II(int obits, IData seed) VL_MT_SAFE {
+    Verilated::randSeed(static_cast<int>(seed));
+    return VL_RANDOM_I(obits);
+}
+
 IData VL_RAND_RESET_I(int obits) VL_MT_SAFE {
     if (Verilated::randReset() == 0) return 0;
     IData data = ~0;
@@ -556,7 +553,7 @@ WDataOutP VL_POWSS_WWW(int obits, int, int rbits, WDataOutP owp, WDataInP lwp, W
                 return owp;
             }
         }
-        return 0;
+        return owp;
     }
     return VL_POW_WWW(obits, rbits, rbits, owp, lwp, rwp);
 }
@@ -688,7 +685,7 @@ void _vl_vsformat(std::string& output, const char* formatp, va_list ap) VL_MT_SA
     // Note uses a single buffer internally; presumes only one usage per printf
     // Note also assumes variables < 64 are not wide, this assumption is
     // sometimes not true in low-level routines written here in verilated.cpp
-    static VL_THREAD_LOCAL char tmp[VL_VALUE_STRING_MAX_WIDTH];
+    static VL_THREAD_LOCAL char t_tmp[VL_VALUE_STRING_MAX_WIDTH];
     const char* pctp = nullptr;  // Most recent %##.##g format
     bool inPct = false;
     bool widthSet = false;
@@ -766,11 +763,11 @@ void _vl_vsformat(std::string& output, const char* formatp, va_list ap) VL_MT_SA
                 if (lbits) {}  // UNUSED - always 64
                 if (fmt == '^') {  // Realtime
                     if (!widthSet) width = VerilatedImp::timeFormatWidth();
-                    output += _vl_vsformat_time(tmp, d, left, width);
+                    output += _vl_vsformat_time(t_tmp, d, left, width);
                 } else {
                     std::string fmts(pctp, pos - pctp + 1);
-                    sprintf(tmp, fmts.c_str(), d);
-                    output += tmp;
+                    sprintf(t_tmp, fmts.c_str(), d);
+                    output += t_tmp;
                 }
                 break;
             }
@@ -814,9 +811,9 @@ void _vl_vsformat(std::string& output, const char* formatp, va_list ap) VL_MT_SA
                     int digits = 0;
                     std::string append;
                     if (lbits <= VL_QUADSIZE) {
-                        digits = sprintf(tmp, "%" VL_PRI64 "d",
+                        digits = sprintf(t_tmp, "%" VL_PRI64 "d",
                                          static_cast<vlsint64_t>(VL_EXTENDS_QQ(lbits, lbits, ld)));
-                        append = tmp;
+                        append = t_tmp;
                     } else {
                         if (VL_SIGN_E(lbits, lwp[VL_WORDS_I(lbits) - 1])) {
                             WData neg[VL_VALUE_STRING_MAX_WIDTH / 4 + 2];
@@ -843,8 +840,8 @@ void _vl_vsformat(std::string& output, const char* formatp, va_list ap) VL_MT_SA
                     int digits = 0;
                     std::string append;
                     if (lbits <= VL_QUADSIZE) {
-                        digits = sprintf(tmp, "%" VL_PRI64 "u", ld);
-                        append = tmp;
+                        digits = sprintf(t_tmp, "%" VL_PRI64 "u", ld);
+                        append = t_tmp;
                     } else {
                         append = VL_DECIMAL_NW(lbits, lwp);
                         digits = append.length();
@@ -863,7 +860,7 @@ void _vl_vsformat(std::string& output, const char* formatp, va_list ap) VL_MT_SA
                 }
                 case 't': {  // Time
                     if (!widthSet) width = VerilatedImp::timeFormatWidth();
-                    output += _vl_vsformat_time(tmp, static_cast<double>(ld), left, width);
+                    output += _vl_vsformat_time(t_tmp, static_cast<double>(ld), left, width);
                     break;
                 }
                 case 'b':
@@ -913,10 +910,11 @@ void _vl_vsformat(std::string& output, const char* formatp, va_list ap) VL_MT_SA
                         output += "0123456789abcdef"[charval];
                     }
                     break;
-                default:
+                default: {  // LCOV_EXCL_START
                     std::string msg = std::string("Unknown _vl_vsformat code: ") + pos[0];
                     VL_FATAL_MT(__FILE__, __LINE__, "", msg.c_str());
                     break;
+                }  // LCOV_EXCL_STOP
                 }  // switch
             }
             }  // switch
@@ -1036,7 +1034,7 @@ IData _vl_vsscanf(FILE* fp,  // If a fscanf
     // Read a Verilog $sscanf/$fscanf style format into the output list
     // The format must be pre-processed (and lower cased) by Verilator
     // Arguments are in "width, arg-value (or WDataIn* if wide)" form
-    static VL_THREAD_LOCAL char tmp[VL_VALUE_STRING_MAX_WIDTH];
+    static VL_THREAD_LOCAL char t_tmp[VL_VALUE_STRING_MAX_WIDTH];
     int floc = fbits - 1;
     IData got = 0;
     bool inPct = false;
@@ -1044,7 +1042,7 @@ IData _vl_vsscanf(FILE* fp,  // If a fscanf
     const char* pos = formatp;
     for (; *pos && !_vl_vsss_eof(fp, floc); ++pos) {
         // VL_DBG_MSGF("_vlscan fmt='"<<pos[0]<<"' floc="<<floc<<" file='"<<_vl_vsss_peek(fp, floc,
-        // fromp, fstr)<<"'"<<endl);
+        // fromp, fstr)<<"'\n");
         if (!inPct && pos[0] == '%') {
             inPct = true;
             inIgnore = false;
@@ -1078,7 +1076,17 @@ IData _vl_vsscanf(FILE* fp,  // If a fscanf
                 WData qowp[VL_WQ_WORDS_E];
                 VL_SET_WQ(qowp, 0ULL);
                 WDataOutP owp = qowp;
-                if (obits > VL_QUADSIZE) owp = va_arg(ap, WDataOutP);
+                if (obits == -1) {  // string
+                    owp = nullptr;
+                    if (VL_UNCOVERABLE(fmt != 's')) {
+                        VL_FATAL_MT(
+                            __FILE__, __LINE__, "",
+                            "Internal: format other than %s is passed to string");  // LCOV_EXCL_LINE
+                    }
+                } else if (obits > VL_QUADSIZE) {
+                    owp = va_arg(ap, WDataOutP);
+                }
+
                 for (int i = 0; i < VL_WORDS_I(obits); ++i) owp[i] = 0;
                 switch (fmt) {
                 case 'c': {
@@ -1090,22 +1098,24 @@ IData _vl_vsscanf(FILE* fp,  // If a fscanf
                 }
                 case 's': {
                     _vl_vsss_skipspace(fp, floc, fromp, fstr);
-                    _vl_vsss_read_str(fp, floc, fromp, fstr, tmp, nullptr);
-                    if (!tmp[0]) goto done;
-                    int lpos = (static_cast<int>(strlen(tmp))) - 1;
-                    int lsb = 0;
-                    for (int i = 0; i < obits && lpos >= 0; --lpos) {
-                        _vl_vsss_setbit(owp, obits, lsb, 8, tmp[lpos]);
-                        lsb += 8;
+                    _vl_vsss_read_str(fp, floc, fromp, fstr, t_tmp, nullptr);
+                    if (!t_tmp[0]) goto done;
+                    if (owp) {
+                        int lpos = (static_cast<int>(strlen(t_tmp))) - 1;
+                        int lsb = 0;
+                        for (int i = 0; i < obits && lpos >= 0; --lpos) {
+                            _vl_vsss_setbit(owp, obits, lsb, 8, t_tmp[lpos]);
+                            lsb += 8;
+                        }
                     }
                     break;
                 }
                 case 'd': {  // Signed decimal
                     _vl_vsss_skipspace(fp, floc, fromp, fstr);
-                    _vl_vsss_read_str(fp, floc, fromp, fstr, tmp, "0123456789+-xXzZ?_");
-                    if (!tmp[0]) goto done;
+                    _vl_vsss_read_str(fp, floc, fromp, fstr, t_tmp, "0123456789+-xXzZ?_");
+                    if (!t_tmp[0]) goto done;
                     vlsint64_t ld = 0;
-                    sscanf(tmp, "%30" VL_PRI64 "d", &ld);
+                    sscanf(t_tmp, "%30" VL_PRI64 "d", &ld);
                     VL_SET_WQ(owp, ld);
                     break;
                 }
@@ -1113,46 +1123,47 @@ IData _vl_vsscanf(FILE* fp,  // If a fscanf
                 case 'e':
                 case 'g': {  // Real number
                     _vl_vsss_skipspace(fp, floc, fromp, fstr);
-                    _vl_vsss_read_str(fp, floc, fromp, fstr, tmp, "+-.0123456789eE");
-                    if (!tmp[0]) goto done;
+                    _vl_vsss_read_str(fp, floc, fromp, fstr, t_tmp, "+-.0123456789eE");
+                    if (!t_tmp[0]) goto done;
                     // cppcheck-suppress unusedStructMember  // It's used
                     union {
                         double r;
                         vlsint64_t ld;
                     } u;
-                    u.r = strtod(tmp, nullptr);
+                    u.r = strtod(t_tmp, nullptr);
                     VL_SET_WQ(owp, u.ld);
                     break;
                 }
                 case 't':  // FALLTHRU  // Time
                 case '#': {  // Unsigned decimal
                     _vl_vsss_skipspace(fp, floc, fromp, fstr);
-                    _vl_vsss_read_str(fp, floc, fromp, fstr, tmp, "0123456789+-xXzZ?_");
-                    if (!tmp[0]) goto done;
+                    _vl_vsss_read_str(fp, floc, fromp, fstr, t_tmp, "0123456789+-xXzZ?_");
+                    if (!t_tmp[0]) goto done;
                     QData ld = 0;
-                    sscanf(tmp, "%30" VL_PRI64 "u", &ld);
+                    sscanf(t_tmp, "%30" VL_PRI64 "u", &ld);
                     VL_SET_WQ(owp, ld);
                     break;
                 }
                 case 'b': {
                     _vl_vsss_skipspace(fp, floc, fromp, fstr);
-                    _vl_vsss_read_str(fp, floc, fromp, fstr, tmp, "01xXzZ?_");
-                    if (!tmp[0]) goto done;
-                    _vl_vsss_based(owp, obits, 1, tmp, 0, strlen(tmp));
+                    _vl_vsss_read_str(fp, floc, fromp, fstr, t_tmp, "01xXzZ?_");
+                    if (!t_tmp[0]) goto done;
+                    _vl_vsss_based(owp, obits, 1, t_tmp, 0, strlen(t_tmp));
                     break;
                 }
                 case 'o': {
                     _vl_vsss_skipspace(fp, floc, fromp, fstr);
-                    _vl_vsss_read_str(fp, floc, fromp, fstr, tmp, "01234567xXzZ?_");
-                    if (!tmp[0]) goto done;
-                    _vl_vsss_based(owp, obits, 3, tmp, 0, strlen(tmp));
+                    _vl_vsss_read_str(fp, floc, fromp, fstr, t_tmp, "01234567xXzZ?_");
+                    if (!t_tmp[0]) goto done;
+                    _vl_vsss_based(owp, obits, 3, t_tmp, 0, strlen(t_tmp));
                     break;
                 }
                 case 'x': {
                     _vl_vsss_skipspace(fp, floc, fromp, fstr);
-                    _vl_vsss_read_str(fp, floc, fromp, fstr, tmp, "0123456789abcdefABCDEFxXzZ?_");
-                    if (!tmp[0]) goto done;
-                    _vl_vsss_based(owp, obits, 4, tmp, 0, strlen(tmp));
+                    _vl_vsss_read_str(fp, floc, fromp, fstr, t_tmp,
+                                      "0123456789abcdefABCDEFxXzZ?_");
+                    if (!t_tmp[0]) goto done;
+                    _vl_vsss_based(owp, obits, 4, t_tmp, 0, strlen(t_tmp));
                     break;
                 }
                 case 'u': {
@@ -1182,15 +1193,20 @@ IData _vl_vsscanf(FILE* fp,  // If a fscanf
                     }
                     break;
                 }
-                default:
+                default: {  // LCOV_EXCL_START
                     std::string msg = std::string("Unknown _vl_vsscanf code: ") + pos[0];
                     VL_FATAL_MT(__FILE__, __LINE__, "", msg.c_str());
                     break;
+                }  // LCOV_EXCL_STOP
+
                 }  // switch
 
                 if (!inIgnore) ++got;
                 // Reload data if non-wide (if wide, we put it in the right place directly)
                 if (obits == 0) {  // Due to inIgnore
+                } else if (obits == -1) {  // string
+                    std::string* p = va_arg(ap, std::string*);
+                    *p = t_tmp;
                 } else if (obits <= VL_BYTESIZE) {
                     CData* p = va_arg(ap, CData*);
                     *p = owp[0];
@@ -1249,36 +1265,44 @@ void _VL_STRING_TO_VINT(int obits, void* destp, size_t srclen, const char* srcp)
     for (; i < bytes; ++i) { *op++ = 0; }
 }
 
-IData VL_FGETS_IXI(int obits, void* destp, IData fpi) VL_MT_SAFE {
+static IData getLine(std::string& str, IData fpi, size_t maxLen) VL_MT_SAFE {
+    str.clear();
+
     // While threadsafe, each thread can only access different file handles
     FILE* fp = VL_CVT_I_FP(fpi);
     if (VL_UNLIKELY(!fp)) return 0;
 
-    // The string needs to be padded with 0's in unused spaces in front of
-    // any read data.  This means we can't know in what location the first
-    // character will finally live, so we need to copy.  Yuk.
-    IData bytes = VL_BYTES_I(obits);
-    char buffer[VL_TO_STRING_MAX_WORDS * VL_EDATASIZE + 1];
+    // We don't use fgets, as we must read \0s.
+    while (str.size() < maxLen) {
+        const int c = getc(fp);  // getc() is threadsafe
+        if (c == EOF) break;
+        str.push_back(c);
+        if (c == '\n') break;
+    }
+    return str.size();
+}
+
+IData VL_FGETS_IXI(int obits, void* destp, IData fpi) VL_MT_SAFE {
+    std::string str;
+    const IData bytes = VL_BYTES_I(obits);
+    IData got = getLine(str, fpi, bytes);
+
+    if (VL_UNLIKELY(str.empty())) return 0;
+
     // V3Emit has static check that bytes < VL_TO_STRING_MAX_WORDS, but be safe
-    if (VL_UNCOVERABLE(bytes > VL_TO_STRING_MAX_WORDS * VL_EDATASIZE)) {
+    if (VL_UNCOVERABLE(bytes < str.size())) {
         VL_FATAL_MT(__FILE__, __LINE__, "", "Internal: fgets buffer overrun");  // LCOV_EXCL_LINE
     }
 
-    // We don't use fgets, as we must read \0s.
-    IData got = 0;
-    char* cp = buffer;
-    while (got < bytes) {
-        int c = getc(fp);  // getc() is threadsafe
-        if (c == EOF) break;
-        *cp++ = c;
-        got++;
-        if (c == '\n') break;
-    }
-
-    _VL_STRING_TO_VINT(obits, destp, got, buffer);
+    _VL_STRING_TO_VINT(obits, destp, got, str.data());
     return got;
 }
 
+// declared in verilated_heavy.h
+IData VL_FGETS_NI(std::string& dest, IData fpi) VL_MT_SAFE {
+    return getLine(dest, fpi, std::numeric_limits<size_t>::max());
+}
+
 IData VL_FERROR_IN(IData, std::string& outputr) VL_MT_SAFE {
     // We ignore lhs/fpi - IEEE says "most recent error" so probably good enough
     IData ret = errno;
@@ -1306,58 +1330,58 @@ void VL_FCLOSE_I(IData fdi) VL_MT_SAFE {
 void VL_FFLUSH_ALL() VL_MT_SAFE { fflush(stdout); }
 
 void VL_SFORMAT_X(int obits, CData& destr, const char* formatp, ...) VL_MT_SAFE {
-    static VL_THREAD_LOCAL std::string output;  // static only for speed
-    output = "";
+    static VL_THREAD_LOCAL std::string t_output;  // static only for speed
+    t_output = "";
     va_list ap;
     va_start(ap, formatp);
-    _vl_vsformat(output, formatp, ap);
+    _vl_vsformat(t_output, formatp, ap);
     va_end(ap);
 
-    _VL_STRING_TO_VINT(obits, &destr, output.length(), output.c_str());
+    _VL_STRING_TO_VINT(obits, &destr, t_output.length(), t_output.c_str());
 }
 
 void VL_SFORMAT_X(int obits, SData& destr, const char* formatp, ...) VL_MT_SAFE {
-    static VL_THREAD_LOCAL std::string output;  // static only for speed
-    output = "";
+    static VL_THREAD_LOCAL std::string t_output;  // static only for speed
+    t_output = "";
     va_list ap;
     va_start(ap, formatp);
-    _vl_vsformat(output, formatp, ap);
+    _vl_vsformat(t_output, formatp, ap);
     va_end(ap);
 
-    _VL_STRING_TO_VINT(obits, &destr, output.length(), output.c_str());
+    _VL_STRING_TO_VINT(obits, &destr, t_output.length(), t_output.c_str());
 }
 
 void VL_SFORMAT_X(int obits, IData& destr, const char* formatp, ...) VL_MT_SAFE {
-    static VL_THREAD_LOCAL std::string output;  // static only for speed
-    output = "";
+    static VL_THREAD_LOCAL std::string t_output;  // static only for speed
+    t_output = "";
     va_list ap;
     va_start(ap, formatp);
-    _vl_vsformat(output, formatp, ap);
+    _vl_vsformat(t_output, formatp, ap);
     va_end(ap);
 
-    _VL_STRING_TO_VINT(obits, &destr, output.length(), output.c_str());
+    _VL_STRING_TO_VINT(obits, &destr, t_output.length(), t_output.c_str());
 }
 
 void VL_SFORMAT_X(int obits, QData& destr, const char* formatp, ...) VL_MT_SAFE {
-    static VL_THREAD_LOCAL std::string output;  // static only for speed
-    output = "";
+    static VL_THREAD_LOCAL std::string t_output;  // static only for speed
+    t_output = "";
     va_list ap;
     va_start(ap, formatp);
-    _vl_vsformat(output, formatp, ap);
+    _vl_vsformat(t_output, formatp, ap);
     va_end(ap);
 
-    _VL_STRING_TO_VINT(obits, &destr, output.length(), output.c_str());
+    _VL_STRING_TO_VINT(obits, &destr, t_output.length(), t_output.c_str());
 }
 
 void VL_SFORMAT_X(int obits, void* destp, const char* formatp, ...) VL_MT_SAFE {
-    static VL_THREAD_LOCAL std::string output;  // static only for speed
-    output = "";
+    static VL_THREAD_LOCAL std::string t_output;  // static only for speed
+    t_output = "";
     va_list ap;
     va_start(ap, formatp);
-    _vl_vsformat(output, formatp, ap);
+    _vl_vsformat(t_output, formatp, ap);
     va_end(ap);
 
-    _VL_STRING_TO_VINT(obits, destp, output.length(), output.c_str());
+    _VL_STRING_TO_VINT(obits, destp, t_output.length(), t_output.c_str());
 }
 
 void VL_SFORMAT_X(int obits_ignored, std::string& output, const char* formatp, ...) VL_MT_SAFE {
@@ -1370,38 +1394,38 @@ void VL_SFORMAT_X(int obits_ignored, std::string& output, const char* formatp, .
 }
 
 std::string VL_SFORMATF_NX(const char* formatp, ...) VL_MT_SAFE {
-    static VL_THREAD_LOCAL std::string output;  // static only for speed
-    output = "";
+    static VL_THREAD_LOCAL std::string t_output;  // static only for speed
+    t_output = "";
     va_list ap;
     va_start(ap, formatp);
-    _vl_vsformat(output, formatp, ap);
+    _vl_vsformat(t_output, formatp, ap);
     va_end(ap);
 
-    return output;
+    return t_output;
 }
 
 void VL_WRITEF(const char* formatp, ...) VL_MT_SAFE {
-    static VL_THREAD_LOCAL std::string output;  // static only for speed
-    output = "";
+    static VL_THREAD_LOCAL std::string t_output;  // static only for speed
+    t_output = "";
     va_list ap;
     va_start(ap, formatp);
-    _vl_vsformat(output, formatp, ap);
+    _vl_vsformat(t_output, formatp, ap);
     va_end(ap);
 
-    VL_PRINTF_MT("%s", output.c_str());
+    VL_PRINTF_MT("%s", t_output.c_str());
 }
 
 void VL_FWRITEF(IData fpi, const char* formatp, ...) VL_MT_SAFE {
     // While threadsafe, each thread can only access different file handles
-    static VL_THREAD_LOCAL std::string output;  // static only for speed
-    output = "";
+    static VL_THREAD_LOCAL std::string t_output;  // static only for speed
+    t_output = "";
 
     va_list ap;
     va_start(ap, formatp);
-    _vl_vsformat(output, formatp, ap);
+    _vl_vsformat(t_output, formatp, ap);
     va_end(ap);
 
-    VerilatedImp::fdWrite(fpi, output);
+    VerilatedImp::fdWrite(fpi, t_output);
 }
 
 IData VL_FSCANF_IX(IData fpi, const char* formatp, ...) VL_MT_SAFE {
@@ -1622,12 +1646,12 @@ IData VL_VALUEPLUSARGS_INN(int, const std::string& ld, std::string& rdr) VL_MT_S
 
 const char* vl_mc_scan_plusargs(const char* prefixp) VL_MT_SAFE {
     const std::string& match = VerilatedImp::argPlusMatch(prefixp);
-    static VL_THREAD_LOCAL char outstr[VL_VALUE_STRING_MAX_WIDTH];
+    static VL_THREAD_LOCAL char t_outstr[VL_VALUE_STRING_MAX_WIDTH];
     if (match.empty()) return nullptr;
-    outstr[0] = '\0';
-    strncat(outstr, match.c_str() + strlen(prefixp) + 1,  // +1 to skip the "+"
+    t_outstr[0] = '\0';
+    strncat(t_outstr, match.c_str() + strlen(prefixp) + 1,  // +1 to skip the "+"
             VL_VALUE_STRING_MAX_WIDTH - 1);
-    return outstr;
+    return t_outstr;
 }
 
 //===========================================================================
@@ -1733,31 +1757,31 @@ const char* vl_dumpctl_filenamep(bool setit, const std::string& filename) VL_MT_
 static const char* memhFormat(int nBits) {
     assert((nBits >= 1) && (nBits <= 32));
 
-    static VL_THREAD_LOCAL char buf[32];
+    static VL_THREAD_LOCAL char t_buf[32];
     switch ((nBits - 1) / 4) {
-    case 0: VL_SNPRINTF(buf, 32, "%%01x"); break;
-    case 1: VL_SNPRINTF(buf, 32, "%%02x"); break;
-    case 2: VL_SNPRINTF(buf, 32, "%%03x"); break;
-    case 3: VL_SNPRINTF(buf, 32, "%%04x"); break;
-    case 4: VL_SNPRINTF(buf, 32, "%%05x"); break;
-    case 5: VL_SNPRINTF(buf, 32, "%%06x"); break;
-    case 6: VL_SNPRINTF(buf, 32, "%%07x"); break;
-    case 7: VL_SNPRINTF(buf, 32, "%%08x"); break;
+    case 0: VL_SNPRINTF(t_buf, 32, "%%01x"); break;
+    case 1: VL_SNPRINTF(t_buf, 32, "%%02x"); break;
+    case 2: VL_SNPRINTF(t_buf, 32, "%%03x"); break;
+    case 3: VL_SNPRINTF(t_buf, 32, "%%04x"); break;
+    case 4: VL_SNPRINTF(t_buf, 32, "%%05x"); break;
+    case 5: VL_SNPRINTF(t_buf, 32, "%%06x"); break;
+    case 6: VL_SNPRINTF(t_buf, 32, "%%07x"); break;
+    case 7: VL_SNPRINTF(t_buf, 32, "%%08x"); break;
     default: assert(false); break;  // LCOV_EXCL_LINE
     }
-    return buf;
+    return t_buf;
 }
 
 static const char* formatBinary(int nBits, vluint32_t bits) {
     assert((nBits >= 1) && (nBits <= 32));
 
-    static VL_THREAD_LOCAL char buf[64];
+    static VL_THREAD_LOCAL char t_buf[64];
     for (int i = 0; i < nBits; i++) {
         bool isOne = bits & (1 << (nBits - 1 - i));
-        buf[i] = (isOne ? '1' : '0');
+        t_buf[i] = (isOne ? '1' : '0');
     }
-    buf[nBits] = '\0';
-    return buf;
+    t_buf[nBits] = '\0';
+    return t_buf;
 }
 
 VlReadMem::VlReadMem(bool hex, int bits, const std::string& filename, QData start, QData end)
@@ -2176,11 +2200,8 @@ void VL_TIMEFORMAT_IINI(int units, int precision, const std::string& suffix,
 //===========================================================================
 // Verilated:: Methods
 
-Verilated::ThreadLocal::ThreadLocal() {}
-Verilated::ThreadLocal::~ThreadLocal() {}
-
 void Verilated::debug(int level) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_s.s_debug = level;
     if (level) {
 #ifdef VL_DEBUG
@@ -2194,49 +2215,65 @@ void Verilated::debug(int level) VL_MT_SAFE {
     }
 }
 void Verilated::randReset(int val) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_s.s_randReset = val;
 }
 void Verilated::randSeed(int val) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_s.s_randSeed = val;
+    vluint64_t newEpoch = s_s.s_randSeedEpoch + 1;
+    if (VL_UNLIKELY(newEpoch == 0)) newEpoch = 1;
+        // Obververs must see new epoch AFTER seed updated
+#ifdef VL_THREADED
+    std::atomic_signal_fence(std::memory_order_release);
+#endif
+    s_s.s_randSeedEpoch = newEpoch;
+}
+vluint64_t Verilated::randSeedDefault64() VL_MT_SAFE {
+    if (Verilated::randSeed() != 0) {
+        return ((static_cast<vluint64_t>(Verilated::randSeed()) << 32)
+                ^ (static_cast<vluint64_t>(Verilated::randSeed())));
+    } else {
+        return ((static_cast<vluint64_t>(vl_sys_rand32()) << 32)
+                ^ (static_cast<vluint64_t>(vl_sys_rand32())));
+    }
 }
 void Verilated::calcUnusedSigs(bool flag) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_s.s_calcUnusedSigs = flag;
 }
 void Verilated::errorCount(int val) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_s.s_errorCount = val;
 }
 void Verilated::errorCountInc() VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     ++s_s.s_errorCount;
 }
 void Verilated::errorLimit(int val) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_s.s_errorLimit = val;
 }
 void Verilated::gotFinish(bool flag) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_s.s_gotFinish = flag;
 }
 void Verilated::assertOn(bool flag) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_s.s_assertOn = flag;
 }
 void Verilated::fatalOnVpiError(bool flag) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_s.s_fatalOnVpiError = flag;
 }
 void Verilated::timeunit(int value) VL_MT_SAFE {
     if (value < 0) value = -value;  // Stored as 0..15
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_s.s_timeunit = value;
 }
 void Verilated::timeprecision(int value) VL_MT_SAFE {
     if (value < 0) value = -value;  // Stored as 0..15
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_s.s_timeprecision = value;
 #ifdef SYSTEMC_VERSION
     sc_time sc_res = sc_get_time_resolution();
@@ -2267,15 +2304,15 @@ void Verilated::timeprecision(int value) VL_MT_SAFE {
 #endif
 }
 void Verilated::profThreadsStart(vluint64_t flag) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_ns.s_profThreadsStart = flag;
 }
 void Verilated::profThreadsWindow(vluint64_t flag) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     s_ns.s_profThreadsWindow = flag;
 }
 void Verilated::profThreadsFilenamep(const char* flagp) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
+    const VerilatedLockGuard lock(s_mutex);
     if (s_ns.s_profThreadsFilenamep) free(const_cast<char*>(s_ns.s_profThreadsFilenamep));
     s_ns.s_profThreadsFilenamep = strdup(flagp);
 }
@@ -2283,18 +2320,18 @@ void Verilated::profThreadsFilenamep(const char* flagp) VL_MT_SAFE {
 const char* Verilated::catName(const char* n1, const char* n2, const char* delimiter) VL_MT_SAFE {
     // Returns new'ed data
     // Used by symbol table creation to make module names
-    static VL_THREAD_LOCAL char* strp = nullptr;
-    static VL_THREAD_LOCAL size_t len = 0;
+    static VL_THREAD_LOCAL char* t_strp = nullptr;
+    static VL_THREAD_LOCAL size_t t_len = 0;
     size_t newlen = strlen(n1) + strlen(n2) + strlen(delimiter) + 1;
-    if (!strp || newlen > len) {
-        if (strp) delete[] strp;
-        strp = new char[newlen];
-        len = newlen;
+    if (!t_strp || newlen > t_len) {
+        if (t_strp) delete[] t_strp;
+        t_strp = new char[newlen];
+        t_len = newlen;
     }
-    strcpy(strp, n1);
-    if (*n1) strcat(strp, delimiter);
-    strcat(strp, n2);
-    return strp;
+    strcpy(t_strp, n1);
+    if (*n1) strcat(t_strp, delimiter);
+    strcat(t_strp, n2);
+    return t_strp;
 }
 
 //=========================================================================
@@ -2303,8 +2340,8 @@ const char* Verilated::catName(const char* n1, const char* n2, const char* delim
 // Keeping these out of class Verilated to avoid having to include <list>
 // in verilated.h (for compilation speed)
 typedef std::list<std::pair<Verilated::VoidPCb, void*>> VoidPCbList;
-static VoidPCbList g_flushCbs;
-static VoidPCbList g_exitCbs;
+static VoidPCbList s_flushCbs;
+static VoidPCbList s_exitCbs;
 
 static void addCb(Verilated::VoidPCb cb, void* datap, VoidPCbList& cbs) {
     std::pair<Verilated::VoidPCb, void*> pair(cb, datap);
@@ -2320,16 +2357,16 @@ static void runCallbacks(VoidPCbList& cbs) VL_MT_SAFE {
 }
 
 void Verilated::addFlushCb(VoidPCb cb, void* datap) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
-    addCb(cb, datap, g_flushCbs);
+    const VerilatedLockGuard lock(s_mutex);
+    addCb(cb, datap, s_flushCbs);
 }
 void Verilated::removeFlushCb(VoidPCb cb, void* datap) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
-    removeCb(cb, datap, g_flushCbs);
+    const VerilatedLockGuard lock(s_mutex);
+    removeCb(cb, datap, s_flushCbs);
 }
 void Verilated::runFlushCallbacks() VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
-    runCallbacks(g_flushCbs);
+    const VerilatedLockGuard lock(s_mutex);
+    runCallbacks(s_flushCbs);
     fflush(stderr);
     fflush(stdout);
     // When running internal code coverage (gcc --coverage, as opposed to
@@ -2339,16 +2376,16 @@ void Verilated::runFlushCallbacks() VL_MT_SAFE {
 }
 
 void Verilated::addExitCb(VoidPCb cb, void* datap) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
-    addCb(cb, datap, g_exitCbs);
+    const VerilatedLockGuard lock(s_mutex);
+    addCb(cb, datap, s_exitCbs);
 }
 void Verilated::removeExitCb(VoidPCb cb, void* datap) VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
-    removeCb(cb, datap, g_exitCbs);
+    const VerilatedLockGuard lock(s_mutex);
+    removeCb(cb, datap, s_exitCbs);
 }
 void Verilated::runExitCallbacks() VL_MT_SAFE {
-    const VerilatedLockGuard lock(m_mutex);
-    runCallbacks(g_exitCbs);
+    const VerilatedLockGuard lock(s_mutex);
+    runCallbacks(s_exitCbs);
 }
 
 const char* Verilated::productName() VL_PURE { return VERILATOR_PRODUCT; }
@@ -2363,11 +2400,11 @@ void Verilated::commandArgs(int argc, const char** argv) VL_MT_SAFE {
 
 const char* Verilated::commandArgsPlusMatch(const char* prefixp) VL_MT_SAFE {
     const std::string& match = VerilatedImp::argPlusMatch(prefixp);
-    static VL_THREAD_LOCAL char outstr[VL_VALUE_STRING_MAX_WIDTH];
+    static VL_THREAD_LOCAL char t_outstr[VL_VALUE_STRING_MAX_WIDTH];
     if (match.empty()) return "";
-    outstr[0] = '\0';
-    strncat(outstr, match.c_str(), VL_VALUE_STRING_MAX_WIDTH - 1);
-    return outstr;
+    t_outstr[0] = '\0';
+    strncat(t_outstr, match.c_str(), VL_VALUE_STRING_MAX_WIDTH - 1);
+    return t_outstr;
 }
 
 void Verilated::nullPointerError(const char* filename, int linenum) VL_MT_SAFE {
@@ -2596,7 +2633,7 @@ vluint32_t VerilatedVarProps::entSize() const {
     case VLVT_UINT32: size = sizeof(IData); break;
     case VLVT_UINT64: size = sizeof(QData); break;
     case VLVT_WDATA: size = VL_WORDS_I(packed().elements()) * sizeof(IData); break;
-    default: size = 0; break;
+    default: size = 0; break;  // LCOV_EXCL_LINE
     }
     return size;
 }
@@ -2622,8 +2659,6 @@ void* VerilatedVarProps::datapAdjustIndex(void* datap, int dim, int indx) const
 //======================================================================
 // VerilatedScope:: Methods
 
-VerilatedScope::VerilatedScope() {}
-
 VerilatedScope::~VerilatedScope() {
     // Memory cleanup - not called during normal operation
     VerilatedImp::scopeErase(this);

include/verilated.h

@@ -129,12 +129,12 @@ extern vluint32_t VL_THREAD_ID() VL_MT_SAFE;
 #define VL_LOCK_SPINS 50000  /// Number of times to spin for a mutex before relaxing
 
 /// Mutex, wrapped to allow -fthread_safety checks
-class VL_CAPABILITY("mutex") VerilatedMutex {
+class VL_CAPABILITY("mutex") VerilatedMutex final {
 private:
     std::mutex m_mutex;  // Mutex
 public:
-    VerilatedMutex() {}
-    ~VerilatedMutex() {}
+    VerilatedMutex() = default;
+    ~VerilatedMutex() = default;
     const VerilatedMutex& operator!() const { return *this; }  // For -fthread_safety
     /// Acquire/lock mutex
     void lock() VL_ACQUIRE() {
@@ -155,7 +155,7 @@ public:
 };
 
 /// Lock guard for mutex (ala std::unique_lock), wrapped to allow -fthread_safety checks
-class VL_SCOPED_CAPABILITY VerilatedLockGuard {
+class VL_SCOPED_CAPABILITY VerilatedLockGuard final {
     VL_UNCOPYABLE(VerilatedLockGuard);
 
 private:
@@ -174,19 +174,19 @@ public:
 #else  // !VL_THREADED
 
 /// Empty non-threaded mutex to avoid #ifdefs in consuming code
-class VerilatedMutex {
+class VerilatedMutex final {
 public:
     void lock() {}
     void unlock() {}
 };
 
 /// Empty non-threaded lock guard to avoid #ifdefs in consuming code
-class VerilatedLockGuard {
+class VerilatedLockGuard final {
     VL_UNCOPYABLE(VerilatedLockGuard);
 
 public:
     explicit VerilatedLockGuard(VerilatedMutex&) {}
-    ~VerilatedLockGuard() {}
+    ~VerilatedLockGuard() = default;
     void lock() {}
     void unlock() {}
 };
@@ -194,7 +194,7 @@ public:
 #endif  // VL_THREADED
 
 /// Remember the calling thread at construction time, and make sure later calls use same thread
-class VerilatedAssertOneThread {
+class VerilatedAssertOneThread final {
     // MEMBERS
 #if defined(VL_THREADED) && defined(VL_DEBUG)
     vluint32_t m_threadid;  /// Thread that is legal
@@ -230,7 +230,7 @@ public:
 
 class VerilatedScope;
 
-class VerilatedModule {
+class VerilatedModule VL_NOT_FINAL {
     VL_UNCOPYABLE(VerilatedModule);
 
 private:
@@ -269,7 +269,8 @@ public:
 #define VL_CELL(instname, type)  ///< Declare a cell, ala SP_CELL
 
 /// Declare a module, ala SC_MODULE
-#define VL_MODULE(modname) class modname : public VerilatedModule
+#define VL_MODULE(modname) class modname VL_NOT_FINAL : public VerilatedModule
+// Not class final in VL_MODULE, as users might be abstracting our models (--hierarchical)
 
 /// Constructor, ala SC_CTOR
 #define VL_CTOR(modname) modname(const char* __VCname = "")
@@ -298,7 +299,7 @@ public:
 //===========================================================================
 /// Verilator symbol table base class
 
-class VerilatedSyms {
+class VerilatedSyms VL_NOT_FINAL {
 public:  // But for internal use only
 #ifdef VL_THREADED
     VerilatedEvalMsgQueue* __Vm_evalMsgQp;
@@ -311,7 +312,7 @@ public:  // But for internal use only
 /// Verilator global class information class
 /// This class is initialized by main thread only. Reading post-init is thread safe.
 
-class VerilatedScope {
+class VerilatedScope final {
 public:
     typedef enum : vluint8_t {
         SCOPE_MODULE,
@@ -330,7 +331,7 @@ private:
     Type m_type = SCOPE_OTHER;  ///< Type of the scope
 
 public:  // But internals only - called from VerilatedModule's
-    VerilatedScope();
+    VerilatedScope() = default;
     ~VerilatedScope();
     void configure(VerilatedSyms* symsp, const char* prefixp, const char* suffixp,
                    const char* identifier, vlsint8_t timeunit, const Type& type) VL_MT_UNSAFE;
@@ -359,7 +360,7 @@ public:  // But internals only - called from VerilatedModule's
     Type type() const { return m_type; }
 };
 
-class VerilatedHierarchy {
+class VerilatedHierarchy final {
 public:
     static void add(VerilatedScope* fromp, VerilatedScope* top);
 };
@@ -367,10 +368,10 @@ public:
 //===========================================================================
 /// Verilator global static information class
 
-class Verilated {
+class Verilated final {
     // MEMBERS
     // Slow path variables
-    static VerilatedMutex m_mutex;  ///< Mutex for s_s/s_ns members, when VL_THREADED
+    static VerilatedMutex s_mutex;  ///< Mutex for s_s/s_ns members, when VL_THREADED
 
     static struct Serialized {  // All these members serialized/deserialized
         // Fast path
@@ -386,8 +387,9 @@ class Verilated {
         int s_errorLimit;  ///< Stop on error number
         int s_randReset;  ///< Random reset: 0=all 0s, 1=all 1s, 2=random
         int s_randSeed;  ///< Random seed: 0=random
+        int s_randSeedEpoch;  ///< Number incrementing on each reseed, 0=illegal
         Serialized();
-        ~Serialized() {}
+        ~Serialized() = default;
     } s_s;
 
     static struct NonSerialized {  // Non-serialized information
@@ -407,8 +409,8 @@ class Verilated {
         VerilatedMutex m_argMutex;  ///< Mutex for s_args members, when VL_THREADED
         int argc = 0;
         const char** argv = nullptr;
-        CommandArgValues() {}
-        ~CommandArgValues() {}
+        CommandArgValues() = default;
+        ~CommandArgValues() = default;
     } s_args;
 
     // Not covered by mutex, as per-thread
@@ -422,8 +424,8 @@ class Verilated {
         const char* t_dpiFilename = nullptr;  ///< DPI context filename
         int t_dpiLineno = 0;  ///< DPI context line number
 
-        ThreadLocal();
-        ~ThreadLocal();
+        ThreadLocal() = default;
+        ~ThreadLocal() = default;
     } t_s;
 
 private:
@@ -442,6 +444,9 @@ public:
     static int randReset() VL_MT_SAFE { return s_s.s_randReset; }  ///< Return randReset value
     static void randSeed(int val) VL_MT_SAFE;
     static int randSeed() VL_MT_SAFE { return s_s.s_randSeed; }  ///< Return randSeed value
+    static vluint32_t randSeedEpoch() VL_MT_SAFE { return s_s.s_randSeedEpoch; }
+    /// Random seed extended to 64 bits, and defaulted if user seed==0
+    static vluint64_t randSeedDefault64() VL_MT_SAFE;
 
     /// Enable debug of internal verilated code
     static void debug(int level) VL_MT_SAFE;
@@ -452,7 +457,7 @@ public:
     static inline int debug() VL_MT_SAFE { return s_s.s_debug; }
 #else
     /// Return constant 0 debug level, so C++'s optimizer rips up
-    static inline int debug() VL_PURE { return 0; }
+    static constexpr int debug() VL_PURE { return 0; }
 #endif
     /// Enable calculation of unused signals
     static void calcUnusedSigs(bool flag) VL_MT_SAFE;
@@ -499,6 +504,7 @@ public:
     static void addFlushCb(VoidPCb cb, void* datap) VL_MT_SAFE;
     static void removeFlushCb(VoidPCb cb, void* datap) VL_MT_SAFE;
     static void runFlushCallbacks() VL_MT_SAFE;
+    static void flushCall() VL_MT_SAFE { runFlushCallbacks(); }  // Deprecated
     /// Callbacks to run prior to termination
     static void addExitCb(VoidPCb cb, void* datap) VL_MT_SAFE;
     static void removeExitCb(VoidPCb cb, void* datap) VL_MT_SAFE;
@@ -566,8 +572,8 @@ public:
     static int dpiLineno() VL_MT_SAFE { return t_s.t_dpiLineno; }
     static int exportFuncNum(const char* namep) VL_MT_SAFE;
 
-    static size_t serialized1Size() VL_PURE { return sizeof(s_s); }
-    static void* serialized1Ptr() VL_MT_UNSAFE { return &s_s; }  // Unsafe, for Serialize only
+    static constexpr size_t serialized1Size() VL_PURE { return sizeof(s_s); }
+    static constexpr void* serialized1Ptr() VL_MT_UNSAFE { return &s_s; }  // For Serialize only
     static size_t serialized2Size() VL_PURE;
     static void* serialized2Ptr() VL_MT_UNSAFE;
 #ifdef VL_THREADED
@@ -647,6 +653,7 @@ extern vluint64_t vl_rand64() VL_MT_SAFE;
 inline IData VL_RANDOM_I(int obits) VL_MT_SAFE { return vl_rand64() & VL_MASK_I(obits); }
 inline QData VL_RANDOM_Q(int obits) VL_MT_SAFE { return vl_rand64() & VL_MASK_Q(obits); }
 extern WDataOutP VL_RANDOM_W(int obits, WDataOutP outwp);  ///< Randomize a signal
+extern IData VL_RANDOM_SEEDED_II(int obits, IData seed) VL_MT_SAFE;
 inline IData VL_URANDOM_RANGE_I(IData hi, IData lo) {
     vluint64_t rnd = vl_rand64();
     if (VL_LIKELY(hi > lo)) {
@@ -752,9 +759,9 @@ static inline void* VL_CVT_Q_VP(QData lhs) VL_PURE {
     u.q = lhs;
     return u.fp;
 }
-/// Return QData from void*
-static inline QData VL_CVT_VP_Q(void* fp) VL_PURE {
-    union { void* fp; QData q; } u;
+/// Return QData from const void*
+static inline QData VL_CVT_VP_Q(const void* fp) VL_PURE {
+    union { const void* fp; QData q; } u;
     u.q = 0;
     u.fp = fp;
     return u.q;

include/verilated.mk.in

@@ -54,6 +54,7 @@ VK_CPPFLAGS_ALWAYS += \
 		-DVM_COVERAGE=$(VM_COVERAGE) \
 		-DVM_SC=$(VM_SC) \
 		-DVM_TRACE=$(VM_TRACE) \
+		-DVM_TRACE_FST=$(VM_TRACE_FST) \
 		$(CFG_CXXFLAGS_NO_UNUSED) \
 
 ifeq ($(CFG_WITH_CCWARN),yes)	# Local... Else don't burden users

include/verilated_cov.cpp

@@ -29,7 +29,7 @@
 // VerilatedCovImpBase
 /// Implementation base class for constants
 
-struct VerilatedCovImpBase {
+struct VerilatedCovImpBase VL_NOT_FINAL {
     // TYPES
     enum { MAX_KEYS = 33 };  /// Maximum user arguments + filename+lineno
     enum { KEY_UNDEF = 0 };  /// Magic key # for unspecified values
@@ -39,7 +39,7 @@ struct VerilatedCovImpBase {
 // VerilatedCovImpItem
 /// Implementation class for a VerilatedCov item
 
-class VerilatedCovImpItem : VerilatedCovImpBase {
+class VerilatedCovImpItem VL_NOT_FINAL : VerilatedCovImpBase {
 public:  // But only local to this file
     // MEMBERS
     int m_keys[MAX_KEYS];  ///< Key
@@ -52,7 +52,7 @@ public:  // But only local to this file
             m_vals[i] = 0;
         }
     }
-    virtual ~VerilatedCovImpItem() {}
+    virtual ~VerilatedCovImpItem() = default;
     virtual vluint64_t count() const = 0;
     virtual void zero() const = 0;
 };
@@ -63,7 +63,7 @@ public:  // But only local to this file
 /// This isn't in the header file for auto-magic conversion because it
 /// inlines to too much code and makes compilation too slow.
 
-template <class T> class VerilatedCoverItemSpec : public VerilatedCovImpItem {
+template <class T> class VerilatedCoverItemSpec final : public VerilatedCovImpItem {
 private:
     // MEMBERS
     T* m_countp;  ///< Count value
@@ -78,7 +78,7 @@ public:
         : m_countp{countp} {
         *m_countp = 0;
     }
-    virtual ~VerilatedCoverItemSpec() override {}
+    virtual ~VerilatedCoverItemSpec() override = default;
 };
 
 //=============================================================================
@@ -87,10 +87,10 @@ public:
 /// All value and keys are indexed into a unique number.  Thus we can greatly reduce
 /// the storage requirements for otherwise identical keys.
 
-class VerilatedCovImp : VerilatedCovImpBase {
+class VerilatedCovImp final : VerilatedCovImpBase {
 private:
     // TYPES
-    typedef std::map<std::string, int> ValueIndexMap;
+    typedef std::map<const std::string, int> ValueIndexMap;
     typedef std::map<int, std::string> IndexValueMap;
     typedef std::deque<VerilatedCovImpItem*> ItemList;
 
@@ -99,13 +99,14 @@ private:
     ValueIndexMap m_valueIndexes VL_GUARDED_BY(m_mutex);  ///< Unique arbitrary value for values
     IndexValueMap m_indexValues VL_GUARDED_BY(m_mutex);  ///< Unique arbitrary value for keys
     ItemList m_items VL_GUARDED_BY(m_mutex);  ///< List of all items
+    int m_nextIndex VL_GUARDED_BY(m_mutex) = (KEY_UNDEF + 1);  ///< Next insert value
 
     VerilatedCovImpItem* m_insertp VL_GUARDED_BY(m_mutex) = nullptr;  ///< Item about to insert
     const char* m_insertFilenamep VL_GUARDED_BY(m_mutex) = nullptr;  ///< Filename about to insert
     int m_insertLineno VL_GUARDED_BY(m_mutex) = 0;  ///< Line number about to insert
 
     // CONSTRUCTORS
-    VerilatedCovImp() {}
+    VerilatedCovImp() = default;
     VL_UNCOPYABLE(VerilatedCovImp);
 
 public:
@@ -118,14 +119,13 @@ public:
 private:
     // PRIVATE METHODS
     int valueIndex(const std::string& value) VL_REQUIRES(m_mutex) {
-        static int nextIndex = KEY_UNDEF + 1;
         const auto iter = m_valueIndexes.find(value);
         if (iter != m_valueIndexes.end()) return iter->second;
-        nextIndex++;
-        assert(nextIndex > 0);  // Didn't rollover
-        m_valueIndexes.insert(std::make_pair(value, nextIndex));
-        m_indexValues.insert(std::make_pair(nextIndex, value));
-        return nextIndex;
+        m_nextIndex++;
+        assert(m_nextIndex > 0);  // Didn't rollover
+        m_valueIndexes.insert(std::make_pair(value, m_nextIndex));
+        m_indexValues.insert(std::make_pair(m_nextIndex, value));
+        return m_nextIndex;
     }
     static std::string dequote(const std::string& text) VL_PURE {
         // Quote any special characters
@@ -235,6 +235,7 @@ private:
         m_items.clear();
         m_indexValues.clear();
         m_valueIndexes.clear();
+        m_nextIndex = KEY_UNDEF + 1;
     }
 
 public:
@@ -350,7 +351,7 @@ public:
         os << "# SystemC::Coverage-3\n";
 
         // Build list of events; totalize if collapsing hierarchy
-        typedef std::map<std::string, std::pair<std::string, vluint64_t>> EventMap;
+        typedef std::map<const std::string, std::pair<std::string, vluint64_t>> EventMap;
         EventMap eventCounts;
         for (const auto& itemp : m_items) {
             std::string name;
@@ -399,7 +400,7 @@ public:
             os << i.first;
             if (!i.second.first.empty()) os << keyValueFormatter(VL_CIK_HIER, i.second.first);
             os << "' " << i.second.second;
-            os << std::endl;
+            os << '\n';
         }
     }
 };

include/verilated_cov.h

@@ -88,7 +88,7 @@ template <class T> std::string vlCovCvtToStr(const T& t) VL_PURE {
 /// Global class with methods affecting all coverage data.
 /// All public methods in this class are thread safe.
 
-class VerilatedCov {
+class VerilatedCov final {
     VL_UNCOPYABLE(VerilatedCov);
 
 public:

include/verilated_cov_key.h

@@ -102,7 +102,7 @@ VLCOVGEN_ITEM("name=>'weight',      short=>'w',  group=>0, default=>undef, descr
 /// Verilator coverage global class.
 /// This class is thread safe.
 
-class VerilatedCovKey {
+class VerilatedCovKey final {
 public:
     static std::string shortKey(const std::string& key) VL_PURE {
         // VLCOVGEN_SHORT_AUTO_EDIT_BEGIN

include/verilated_fst_c.h

@@ -35,7 +35,7 @@
 /// Base class to create a Verilator FST dump
 /// This is an internally used class - see VerilatedFstC for what to call from applications
 
-class VerilatedFst : public VerilatedTrace<VerilatedFst> {
+class VerilatedFst final : public VerilatedTrace<VerilatedFst> {
 private:
     // Give the superclass access to private bits (to avoid virtual functions)
     friend class VerilatedTrace<VerilatedFst>;
@@ -128,7 +128,7 @@ template <> void VerilatedTrace<VerilatedFst>::set_time_resolution(const std::st
 /// Also derived for use in SystemC simulations.
 /// Thread safety: Unless otherwise indicated, every function is VL_MT_UNSAFE_ONE
 
-class VerilatedFstC {
+class VerilatedFstC final {
     VerilatedFst m_sptrace;  ///< Trace file being created
 
     // CONSTRUCTORS

include/verilated_heavy.h

@@ -26,10 +26,13 @@
 
 #include "verilated.h"
 
+#include <algorithm>
 #include <deque>
 #include <map>
 #include <memory>
+#include <set>
 #include <string>
+#include <unordered_set>
 
 //===================================================================
 // String formatters (required by below containers)
@@ -41,10 +44,21 @@ extern std::string VL_TO_STRING(QData lhs);
 inline std::string VL_TO_STRING(const std::string& obj) { return "\"" + obj + "\""; }
 extern std::string VL_TO_STRING_W(int words, WDataInP obj);
 
+//===================================================================
+// Shuffle RNG
+
+class VlURNG final {
+public:
+    typedef size_t result_type;
+    static constexpr size_t min() { return 0; }
+    static constexpr size_t max() { return 1ULL << 31; }
+    size_t operator()() { return VL_MASK_I(31) & VL_RANDOM_I(32); }
+};
+
 //===================================================================
 // Readmem/Writemem operation classes
 
-class VlReadMem {
+class VlReadMem final {
     bool m_hex;  // Hex format
     int m_bits;  // Bit width of values
     const std::string& m_filename;  // Filename
@@ -61,7 +75,7 @@ public:
     void setData(void* valuep, const std::string& rhs);
 };
 
-class VlWriteMem {
+class VlWriteMem final {
     bool m_hex;  // Hex format
     int m_bits;  // Bit width of values
     FILE* m_fp;  // File handle for filename
@@ -73,6 +87,363 @@ public:
     void print(QData addr, bool addrstamp, const void* valuep);
 };
 
+//===================================================================
+// Verilog queue and dynamic array container
+// There are no multithreaded locks on this; the base variable must
+// be protected by other means
+//
+// Bound here is the maximum size() allowed, e.g. 1 + SystemVerilog bound
+// For dynamic arrays it is always zero
+template <class T_Value, size_t T_MaxSize = 0> class VlQueue final {
+private:
+    // TYPES
+    typedef std::deque<T_Value> Deque;
+
+public:
+    typedef typename Deque::const_iterator const_iterator;
+
+private:
+    // MEMBERS
+    Deque m_deque;  // State of the assoc array
+    T_Value m_defaultValue;  // Default value
+
+public:
+    // CONSTRUCTORS
+    // m_defaultValue isn't defaulted. Caller's constructor must do it.
+    VlQueue() = default;
+    ~VlQueue() = default;
+    VlQueue(const VlQueue&) = default;
+    VlQueue(VlQueue&&) = default;
+    VlQueue& operator=(const VlQueue&) = default;
+    VlQueue& operator=(VlQueue&&) = default;
+
+    // Standard copy constructor works. Verilog: assoca = assocb
+    // Also must allow conversion from a different T_MaxSize queue
+    template <size_t U_MaxSize = 0> VlQueue operator=(const VlQueue<T_Value, U_MaxSize>& rhs) {
+        m_deque = rhs.privateDeque();
+        if (VL_UNLIKELY(T_MaxSize && T_MaxSize < m_deque.size())) m_deque.resize(T_MaxSize - 1);
+        return *this;
+    }
+
+    static VlQueue cons(const T_Value& lhs) {
+        VlQueue out;
+        out.push_back(lhs);
+        return out;
+    }
+    static VlQueue cons(const T_Value& lhs, const T_Value& rhs) {
+        VlQueue out;
+        out.push_back(rhs);
+        out.push_back(lhs);
+        return out;
+    }
+    static VlQueue cons(const VlQueue& lhs, const T_Value& rhs) {
+        VlQueue out = lhs;
+        out.push_front(rhs);
+        return out;
+    }
+    static VlQueue cons(const T_Value& lhs, const VlQueue& rhs) {
+        VlQueue out = rhs;
+        out.push_back(lhs);
+        return out;
+    }
+    static VlQueue cons(const VlQueue& lhs, const VlQueue& rhs) {
+        VlQueue out = rhs;
+        for (const auto& i : lhs.m_deque) out.push_back(i);
+        return out;
+    }
+
+    // METHODS
+    T_Value& atDefault() { return m_defaultValue; }
+    const T_Value& atDefault() const { return m_defaultValue; }
+    const Deque& privateDeque() const { return m_deque; }
+
+    // Size. Verilog: function int size(), or int num()
+    int size() const { return m_deque.size(); }
+    // Clear array. Verilog: function void delete([input index])
+    void clear() { m_deque.clear(); }
+    void erase(vlsint32_t index) {
+        if (VL_LIKELY(index >= 0 && index < m_deque.size()))
+            m_deque.erase(m_deque.begin() + index);
+    }
+
+    // Dynamic array new[] becomes a renew()
+    void renew(size_t size) {
+        clear();
+        m_deque.resize(size, atDefault());
+    }
+    // Dynamic array new[]() becomes a renew_copy()
+    void renew_copy(size_t size, const VlQueue<T_Value, T_MaxSize>& rhs) {
+        if (size == 0) {
+            clear();
+        } else {
+            *this = rhs;
+            m_deque.resize(size, atDefault());
+        }
+    }
+
+    // function void q.push_front(value)
+    void push_front(const T_Value& value) {
+        m_deque.push_front(value);
+        if (VL_UNLIKELY(T_MaxSize != 0 && m_deque.size() > T_MaxSize)) m_deque.pop_back();
+    }
+    // function void q.push_back(value)
+    void push_back(const T_Value& value) {
+        if (VL_LIKELY(T_MaxSize == 0 || m_deque.size() < T_MaxSize)) m_deque.push_back(value);
+    }
+    // function value_t q.pop_front();
+    T_Value pop_front() {
+        if (m_deque.empty()) return m_defaultValue;
+        T_Value v = m_deque.front();
+        m_deque.pop_front();
+        return v;
+    }
+    // function value_t q.pop_back();
+    T_Value pop_back() {
+        if (m_deque.empty()) return m_defaultValue;
+        T_Value v = m_deque.back();
+        m_deque.pop_back();
+        return v;
+    }
+
+    // Setting. Verilog: assoc[index] = v
+    // 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(vlsint32_t index) {
+        static 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())) {
+            s_throwAway = atDefault();
+            return s_throwAway;
+        } else {
+            return m_deque[index];
+        }
+    }
+    // Accessing. Verilog: v = assoc[index]
+    const T_Value& at(vlsint32_t index) const {
+        static 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();
+        } else {
+            return m_deque[index];
+        }
+    }
+    // function void q.insert(index, value);
+    void insert(vlsint32_t index, const T_Value& value) {
+        if (VL_UNLIKELY(index < 0 || index >= m_deque.size())) return;
+        m_deque.insert(m_deque.begin() + index, value);
+    }
+
+    // Return slice q[lsb:msb]
+    VlQueue slice(vlsint32_t lsb, vlsint32_t msb) const {
+        VlQueue out;
+        if (VL_UNLIKELY(lsb < 0)) lsb = 0;
+        if (VL_UNLIKELY(lsb >= m_deque.size())) lsb = m_deque.size() - 1;
+        if (VL_UNLIKELY(msb >= m_deque.size())) msb = m_deque.size() - 1;
+        for (vlsint32_t i = lsb; i <= msb; ++i) out.push_back(m_deque[i]);
+        return out;
+    }
+
+    // For save/restore
+    const_iterator begin() const { return m_deque.begin(); }
+    const_iterator end() const { return m_deque.end(); }
+
+    // Methods
+    void sort() { std::sort(m_deque.begin(), m_deque.end()); }
+    template <typename Func> void sort(Func with_func) {
+        // with_func returns arbitrary type to use for the sort comparison
+        std::sort(m_deque.begin(), m_deque.end(), [=](const T_Value& a, const T_Value& b) {
+            // index number is meaninless with sort, as it changes
+            return with_func(0, a) < with_func(0, b);
+        });
+    }
+    void rsort() { std::sort(m_deque.rbegin(), m_deque.rend()); }
+    template <typename Func> void rsort(Func with_func) {
+        // with_func returns arbitrary type to use for the sort comparison
+        std::sort(m_deque.rbegin(), m_deque.rend(), [=](const T_Value& a, const T_Value& b) {
+            // index number is meaninless with sort, as it changes
+            return with_func(0, a) < with_func(0, b);
+        });
+    }
+    void reverse() { std::reverse(m_deque.begin(), m_deque.end()); }
+    void shuffle() { std::shuffle(m_deque.begin(), m_deque.end(), VlURNG()); }
+    VlQueue unique() const {
+        VlQueue out;
+        std::unordered_set<T_Value> saw;
+        for (const auto& i : m_deque) {
+            auto it = saw.find(i);
+            if (it == saw.end()) {
+                saw.insert(it, i);
+                out.push_back(i);
+            }
+        }
+        return out;
+    }
+    VlQueue<IData> unique_index() const {
+        VlQueue<IData> out;
+        IData index = 0;
+        std::unordered_set<T_Value> saw;
+        for (const auto& i : m_deque) {
+            auto it = saw.find(i);
+            if (it == saw.end()) {
+                saw.insert(it, i);
+                out.push_back(index);
+            }
+            ++index;
+        }
+        return out;
+    }
+    template <typename Func> VlQueue find(Func with_func) const {
+        VlQueue out;
+        IData index = 0;
+        for (const auto& i : m_deque) {
+            if (with_func(index, i)) out.push_back(i);
+            ++index;
+        }
+        return out;
+    }
+    template <typename Func> VlQueue<IData> find_index(Func with_func) const {
+        VlQueue<IData> out;
+        IData index = 0;
+        for (const auto& i : m_deque) {
+            if (with_func(index, i)) out.push_back(index);
+            ++index;
+        }
+        return out;
+    }
+    template <typename Func> VlQueue find_first(Func with_func) const {
+        // Can't use std::find_if as need index number
+        IData index = 0;
+        for (const auto& i : m_deque) {
+            if (with_func(index, i)) return VlQueue::cons(i);
+            ++index;
+        }
+        return VlQueue{};
+    }
+    template <typename Func> VlQueue<IData> find_first_index(Func with_func) const {
+        IData index = 0;
+        for (const auto& i : m_deque) {
+            if (with_func(index, i)) return VlQueue<IData>::cons(index);
+            ++index;
+        }
+        return VlQueue<IData>{};
+    }
+    template <typename Func> VlQueue find_last(Func with_func) const {
+        IData index = m_deque.size() - 1;
+        for (auto it = m_deque.rbegin(); it != m_deque.rend(); ++it) {
+            if (with_func(index, *it)) return VlQueue::cons(*it);
+            --index;
+        }
+        return VlQueue{};
+    }
+    template <typename Func> VlQueue<IData> find_last_index(Func with_func) const {
+        IData index = m_deque.size() - 1;
+        for (auto it = m_deque.rbegin(); it != m_deque.rend(); ++it) {
+            if (with_func(index, *it)) return VlQueue<IData>::cons(index);
+            --index;
+        }
+        return VlQueue<IData>{};
+    }
+
+    // Reduction operators
+    VlQueue min() const {
+        if (m_deque.empty()) return VlQueue();
+        const auto it = std::min_element(m_deque.begin(), m_deque.end());
+        return VlQueue::cons(*it);
+    }
+    VlQueue max() const {
+        if (m_deque.empty()) return VlQueue();
+        const auto it = std::max_element(m_deque.begin(), m_deque.end());
+        return VlQueue::cons(*it);
+    }
+
+    T_Value r_sum() const {
+        T_Value out(0);  // Type must have assignment operator
+        for (const auto& i : m_deque) out += i;
+        return out;
+    }
+    template <typename Func> T_Value r_sum(Func with_func) const {
+        T_Value out(0);  // Type must have assignment operator
+        IData index = 0;
+        for (const auto& i : m_deque) out += with_func(index++, i);
+        return out;
+    }
+    T_Value r_product() const {
+        if (m_deque.empty()) return T_Value(0);
+        auto it = m_deque.begin();
+        T_Value out{*it};
+        ++it;
+        for (; it != m_deque.end(); ++it) out *= *it;
+        return out;
+    }
+    template <typename Func> T_Value r_product(Func with_func) const {
+        if (m_deque.empty()) return T_Value(0);
+        auto it = m_deque.begin();
+        IData index = 0;
+        T_Value out{with_func(index, *it)};
+        ++it;
+        ++index;
+        for (; it != m_deque.end(); ++it) out *= with_func(index++, *it);
+        return out;
+    }
+    T_Value r_and() const {
+        if (m_deque.empty()) return T_Value(0);
+        auto it = m_deque.begin();
+        T_Value out{*it};
+        ++it;
+        for (; it != m_deque.end(); ++it) out &= *it;
+        return out;
+    }
+    template <typename Func> T_Value r_and(Func with_func) const {
+        if (m_deque.empty()) return T_Value(0);
+        auto it = m_deque.begin();
+        IData index = 0;
+        T_Value out{with_func(index, *it)};
+        ++it;
+        ++index;
+        for (; it != m_deque.end(); ++it) out &= with_func(index, *it);
+        return out;
+    }
+    T_Value r_or() const {
+        T_Value out(0);  // Type must have assignment operator
+        for (const auto& i : m_deque) out |= i;
+        return out;
+    }
+    template <typename Func> T_Value r_or(Func with_func) const {
+        T_Value out(0);  // Type must have assignment operator
+        IData index = 0;
+        for (const auto& i : m_deque) out |= with_func(index++, i);
+        return out;
+    }
+    T_Value r_xor() const {
+        T_Value out(0);  // Type must have assignment operator
+        for (const auto& i : m_deque) out ^= i;
+        return out;
+    }
+    template <typename Func> T_Value r_xor(Func with_func) const {
+        T_Value out(0);  // Type must have assignment operator
+        IData index = 0;
+        for (const auto& i : m_deque) out ^= with_func(index++, i);
+        return out;
+    }
+
+    // Dumping. Verilog: str = $sformatf("%p", assoc)
+    std::string to_string() const {
+        if (m_deque.empty()) return "'{}";  // No trailing space
+        std::string out = "'{";
+        std::string comma;
+        for (const auto& i : m_deque) {
+            out += comma + VL_TO_STRING(i);
+            comma = ", ";
+        }
+        return out + "} ";
+    }
+};
+
+template <class T_Value> std::string VL_TO_STRING(const VlQueue<T_Value>& obj) {
+    return obj.to_string();
+}
+
 //===================================================================
 // Verilog array container
 // Similar to std::array<WData, N>, but lighter weight, only methods needed
@@ -81,13 +452,18 @@ public:
 // This is only used when we need an upper-level container and so can't
 // simply use a C style array (which is just a pointer).
 
-template <std::size_t T_Words> class VlWide {
+template <std::size_t T_Words> class VlWide final {
     WData m_storage[T_Words];
 
 public:
     // cppcheck-suppress uninitVar
-    VlWide() {}
-    ~VlWide() {}
+    VlWide() = default;
+    ~VlWide() = default;
+    VlWide(const VlWide&) = default;
+    VlWide(VlWide&&) = default;
+    VlWide& operator=(const VlWide&) = default;
+    VlWide& operator=(VlWide&&) = default;
+    // METHODS
     const WData& at(size_t index) const { return m_storage[index]; }
     WData& at(size_t index) { return m_storage[index]; }
     WData* data() { return &m_storage[0]; }
@@ -112,7 +488,7 @@ template <std::size_t T_Words> std::string VL_TO_STRING(const VlWide<T_Words>& o
 // There are no multithreaded locks on this; the base variable must
 // be protected by other means
 //
-template <class T_Key, class T_Value> class VlAssocArray {
+template <class T_Key, class T_Value> class VlAssocArray final {
 private:
     // TYPES
     typedef std::map<T_Key, T_Value> Map;
@@ -127,14 +503,17 @@ private:
 
 public:
     // CONSTRUCTORS
-    VlAssocArray() {
-        // m_defaultValue isn't defaulted. Caller's constructor must do it.
-    }
-    ~VlAssocArray() {}
-    // Standard copy constructor works. Verilog: assoca = assocb
+    // m_defaultValue isn't defaulted. Caller's constructor must do it.
+    VlAssocArray() = default;
+    ~VlAssocArray() = default;
+    VlAssocArray(const VlAssocArray&) = default;
+    VlAssocArray(VlAssocArray&&) = default;
+    VlAssocArray& operator=(const VlAssocArray&) = default;
+    VlAssocArray& operator=(VlAssocArray&&) = default;
 
     // METHODS
     T_Value& atDefault() { return m_defaultValue; }
+    const T_Value& atDefault() const { return m_defaultValue; }
 
     // Size of array. Verilog: function int size(), or int num()
     int size() const { return m_map.size(); }
@@ -196,12 +575,176 @@ public:
             return it->second;
         }
     }
+    // Setting as a chained operation
+    VlAssocArray& set(const T_Key& index, const T_Value& value) {
+        at(index) = value;
+        return *this;
+    }
+    VlAssocArray& setDefault(const T_Value& value) {
+        atDefault() = value;
+        return *this;
+    }
+
     // For save/restore
     const_iterator begin() const { return m_map.begin(); }
     const_iterator end() const { return m_map.end(); }
 
+    // Methods
+    VlQueue<T_Value> unique() const {
+        VlQueue<T_Value> out;
+        std::set<T_Value> saw;
+        for (const auto& i : m_map) {
+            auto it = saw.find(i.second);
+            if (it == saw.end()) {
+                saw.insert(it, i.second);
+                out.push_back(i.second);
+            }
+        }
+        return out;
+    }
+    VlQueue<T_Key> unique_index() const {
+        VlQueue<T_Key> out;
+        std::set<T_Key> saw;
+        for (const auto& i : m_map) {
+            auto it = saw.find(i.second);
+            if (it == saw.end()) {
+                saw.insert(it, i.second);
+                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)
+            if (with_func(i.first, i.second)) out.push_back(i.second);
+        return out;
+    }
+    template <typename Func> VlQueue<T_Key> find_index(Func with_func) const {
+        VlQueue<T_Key> out;
+        for (const auto& i : m_map)
+            if (with_func(i.first, i.second)) out.push_back(i.first);
+        return out;
+    }
+    template <typename Func> VlQueue<T_Value> find_first(Func with_func) const {
+        const auto it
+            = std::find_if(m_map.begin(), m_map.end(), [=](const std::pair<T_Key, T_Value>& i) {
+                  return with_func(i.first, i.second);
+              });
+        if (it == m_map.end()) return VlQueue<T_Value>{};
+        return VlQueue<T_Value>::cons(it->second);
+    }
+    template <typename Func> VlQueue<T_Key> find_first_index(Func with_func) const {
+        const auto it
+            = std::find_if(m_map.begin(), m_map.end(), [=](const std::pair<T_Key, T_Value>& i) {
+                  return with_func(i.first, i.second);
+              });
+        if (it == m_map.end()) return VlQueue<T_Value>{};
+        return VlQueue<T_Key>::cons(it->first);
+    }
+    template <typename Func> VlQueue<T_Value> find_last(Func with_func) const {
+        const auto it
+            = std::find_if(m_map.rbegin(), m_map.rend(), [=](const std::pair<T_Key, T_Value>& i) {
+                  return with_func(i.first, i.second);
+              });
+        if (it == m_map.rend()) return VlQueue<T_Value>{};
+        return VlQueue<T_Value>::cons(it->second);
+    }
+    template <typename Func> VlQueue<T_Key> find_last_index(Func with_func) const {
+        const auto it
+            = std::find_if(m_map.rbegin(), m_map.rend(), [=](const std::pair<T_Key, T_Value>& i) {
+                  return with_func(i.first, i.second);
+              });
+        if (it == m_map.rend()) return VlQueue<T_Value>{};
+        return VlQueue<T_Key>::cons(it->first);
+    }
+
+    // Reduction operators
+    VlQueue<T_Value> min() const {
+        if (m_map.empty()) return VlQueue<T_Value>();
+        const auto it = std::min_element(
+            m_map.begin(), m_map.end(),
+            [](const std::pair<T_Key, T_Value>& a, const std::pair<T_Key, T_Value>& b) {
+                return a.second < 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(
+            m_map.begin(), m_map.end(),
+            [](const std::pair<T_Key, T_Value>& a, const std::pair<T_Key, T_Value>& b) {
+                return a.second < b.second;
+            });
+        return VlQueue<T_Value>::cons(it->second);
+    }
+
+    T_Value r_sum() const {
+        T_Value out(0);  // Type must have assignment operator
+        for (const auto& i : m_map) out += i.second;
+        return out;
+    }
+    template <typename Func> T_Value r_sum(Func with_func) const {
+        T_Value out(0);  // Type must have assignment operator
+        for (const auto& i : m_map) out += with_func(i.first, i.second);
+        return out;
+    }
+    T_Value r_product() const {
+        if (m_map.empty()) return T_Value(0);
+        auto it = m_map.begin();
+        T_Value out{it->second};
+        ++it;
+        for (; it != m_map.end(); ++it) out *= it->second;
+        return out;
+    }
+    template <typename Func> T_Value r_product(Func with_func) const {
+        if (m_map.empty()) return T_Value(0);
+        auto it = m_map.begin();
+        T_Value out{with_func(it->first, it->second)};
+        ++it;
+        for (; it != m_map.end(); ++it) out *= with_func(it->first, it->second);
+        return out;
+    }
+    T_Value r_and() const {
+        if (m_map.empty()) return T_Value(0);
+        auto it = m_map.begin();
+        T_Value out{it->second};
+        ++it;
+        for (; it != m_map.end(); ++it) out &= it->second;
+        return out;
+    }
+    template <typename Func> T_Value r_and(Func with_func) const {
+        if (m_map.empty()) return T_Value(0);
+        auto it = m_map.begin();
+        T_Value out{with_func(it->first, it->second)};
+        ++it;
+        for (; it != m_map.end(); ++it) out &= with_func(it->first, it->second);
+        return out;
+    }
+    T_Value r_or() const {
+        T_Value out(0);  // Type must have assignment operator
+        for (const auto& i : m_map) out |= i.second;
+        return out;
+    }
+    template <typename Func> T_Value r_or(Func with_func) const {
+        T_Value out(0);  // Type must have assignment operator
+        for (const auto& i : m_map) out |= with_func(i.first, i.second);
+        return out;
+    }
+    T_Value r_xor() const {
+        T_Value out(0);  // Type must have assignment operator
+        for (const auto& i : m_map) out ^= i.second;
+        return out;
+    }
+    template <typename Func> T_Value r_xor(Func with_func) const {
+        T_Value out(0);  // Type must have assignment operator
+        for (const auto& i : m_map) out ^= with_func(i.first, i.second);
+        return out;
+    }
+
     // Dumping. Verilog: str = $sformatf("%p", assoc)
     std::string to_string() const {
+        if (m_map.empty()) return "'{}";  // No trailing space
         std::string out = "'{";
         std::string comma;
         for (const auto& i : m_map) {
@@ -245,133 +788,6 @@ void VL_WRITEMEM_N(bool hex, int bits, const std::string& filename,
     }
 }
 
-//===================================================================
-// Verilog queue and dynamic array container
-// There are no multithreaded locks on this; the base variable must
-// be protected by other means
-//
-// Bound here is the maximum size() allowed, e.g. 1 + SystemVerilog bound
-// For dynamic arrays it is always zero
-template <class T_Value, size_t T_MaxSize = 0> class VlQueue {
-private:
-    // TYPES
-    typedef std::deque<T_Value> Deque;
-
-public:
-    typedef typename Deque::const_iterator const_iterator;
-
-private:
-    // MEMBERS
-    Deque m_deque;  // State of the assoc array
-    T_Value m_defaultValue;  // Default value
-
-public:
-    // CONSTRUCTORS
-    VlQueue() {
-        // m_defaultValue isn't defaulted. Caller's constructor must do it.
-    }
-    ~VlQueue() {}
-    // Standard copy constructor works. Verilog: assoca = assocb
-
-    // METHODS
-    T_Value& atDefault() { return m_defaultValue; }
-
-    // Size. Verilog: function int size(), or int num()
-    int size() const { return m_deque.size(); }
-    // Clear array. Verilog: function void delete([input index])
-    void clear() { m_deque.clear(); }
-    void erase(size_t index) {
-        if (VL_LIKELY(index < m_deque.size())) m_deque.erase(index);
-    }
-
-    // Dynamic array new[] becomes a renew()
-    void renew(size_t size) {
-        clear();
-        m_deque.resize(size, atDefault());
-    }
-    // Dynamic array new[]() becomes a renew_copy()
-    void renew_copy(size_t size, const VlQueue<T_Value, T_MaxSize>& rhs) {
-        if (size == 0) {
-            clear();
-        } else {
-            *this = rhs;
-            m_deque.resize(size, atDefault());
-        }
-    }
-
-    // function void q.push_front(value)
-    void push_front(const T_Value& value) {
-        m_deque.push_front(value);
-        if (VL_UNLIKELY(T_MaxSize != 0 && m_deque.size() > T_MaxSize)) m_deque.pop_back();
-    }
-    // function void q.push_back(value)
-    void push_back(const T_Value& value) {
-        if (VL_LIKELY(T_MaxSize == 0 || m_deque.size() < T_MaxSize)) m_deque.push_back(value);
-    }
-    // function value_t q.pop_front();
-    T_Value pop_front() {
-        if (m_deque.empty()) return m_defaultValue;
-        T_Value v = m_deque.front();
-        m_deque.pop_front();
-        return v;
-    }
-    // function value_t q.pop_back();
-    T_Value pop_back() {
-        if (m_deque.empty()) return m_defaultValue;
-        T_Value v = m_deque.back();
-        m_deque.pop_back();
-        return v;
-    }
-
-    // Setting. Verilog: assoc[index] = v
-    // 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(size_t index) {
-        static T_Value s_throwAway;
-        // Needs to work for dynamic arrays, so does not use T_MaxSize
-        if (VL_UNLIKELY(index >= m_deque.size())) {
-            s_throwAway = atDefault();
-            return s_throwAway;
-        } else {
-            return m_deque[index];
-        }
-    }
-    // Accessing. Verilog: v = assoc[index]
-    const T_Value& at(size_t index) const {
-        static T_Value s_throwAway;
-        // Needs to work for dynamic arrays, so does not use T_MaxSize
-        if (VL_UNLIKELY(index >= m_deque.size())) {
-            return atDefault();
-        } else {
-            return m_deque[index];
-        }
-    }
-    // function void q.insert(index, value);
-    void insert(size_t index, const T_Value& value) {
-        if (VL_UNLIKELY(index >= m_deque.size())) return;
-        m_deque[index] = value;
-    }
-
-    // For save/restore
-    const_iterator begin() const { return m_deque.begin(); }
-    const_iterator end() const { return m_deque.end(); }
-
-    // Dumping. Verilog: str = $sformatf("%p", assoc)
-    std::string to_string() const {
-        std::string out = "'{";
-        std::string comma;
-        for (const auto& i : m_deque) {
-            out += comma + VL_TO_STRING(i);
-            comma = ", ";
-        }
-        return out + "} ";
-    }
-};
-
-template <class T_Value> std::string VL_TO_STRING(const VlQueue<T_Value>& obj) {
-    return obj.to_string();
-}
-
 //===================================================================
 // Verilog class reference container
 // There are no multithreaded locks on this; the base variable must
@@ -396,6 +812,7 @@ inline std::string VL_CVT_PACK_STR_NQ(QData lhs) VL_PURE {
     return VL_CVT_PACK_STR_NW(VL_WQ_WORDS_E, lw);
 }
 inline std::string VL_CVT_PACK_STR_NN(const std::string& lhs) VL_PURE { return lhs; }
+inline std::string& VL_CVT_PACK_STR_NN(std::string& lhs) VL_PURE { return lhs; }
 inline std::string VL_CVT_PACK_STR_NI(IData lhs) VL_PURE {
     WData lw[VL_WQ_WORDS_E];
     VL_SET_WI(lw, lhs);
@@ -477,17 +894,17 @@ extern std::string VL_SUBSTR_N(const std::string& lhs, IData rhs, IData ths) VL_
 inline IData VL_CMP_NN(const std::string& lhs, const std::string& rhs, bool ignoreCase) VL_PURE {
     // SystemVerilog does not allow a string variable to contain '\0'.
     // So C functions such as strcmp() can correctly compare strings.
-    int result;
     if (ignoreCase) {
-        result = VL_STRCASECMP(lhs.c_str(), rhs.c_str());
+        return VL_STRCASECMP(lhs.c_str(), rhs.c_str());
     } else {
-        result = std::strcmp(lhs.c_str(), rhs.c_str());
+        return std::strcmp(lhs.c_str(), rhs.c_str());
     }
-    return result;
 }
 
 extern IData VL_ATOI_N(const std::string& str, int base) VL_PURE;
 
+extern IData VL_FGETS_NI(std::string& dest, IData fpi);
+
 //======================================================================
 // Dumping
 

include/verilated_imp.h

@@ -46,7 +46,7 @@ class VerilatedScope;
 
 #ifdef VL_THREADED
 /// Message, enqueued on an mtask, and consumed on the main eval thread
-class VerilatedMsg {
+class VerilatedMsg final {
 public:
     // TYPES
     struct Cmp {
@@ -64,7 +64,11 @@ public:
     VerilatedMsg(const std::function<void()>& cb)
         : m_mtaskId{Verilated::mtaskId()}
         , m_cb{cb} {}
-    ~VerilatedMsg() {}
+    ~VerilatedMsg() = default;
+    VerilatedMsg(const VerilatedMsg&) = default;
+    VerilatedMsg(VerilatedMsg&&) = default;
+    VerilatedMsg& operator=(const VerilatedMsg&) = default;
+    VerilatedMsg& operator=(VerilatedMsg&&) = default;
     // METHODS
     vluint32_t mtaskId() const { return m_mtaskId; }
     /// Execute the lambda function
@@ -74,7 +78,7 @@ public:
 /// Each thread has a queue it pushes to
 /// This assumes no thread starts pushing the next tick until the previous has drained.
 /// If more aggressiveness is needed, a double-buffered scheme might work well.
-class VerilatedEvalMsgQueue {
+class VerilatedEvalMsgQueue final {
     typedef std::multiset<VerilatedMsg, VerilatedMsg::Cmp> VerilatedThreadQueue;
 
     std::atomic<vluint64_t> m_depth;  ///< Current depth of queue (see comments below)
@@ -87,7 +91,7 @@ public:
         : m_depth{0} {
         assert(atomic_is_lock_free(&m_depth));
     }
-    ~VerilatedEvalMsgQueue() {}
+    ~VerilatedEvalMsgQueue() = default;
 
 private:
     VL_UNCOPYABLE(VerilatedEvalMsgQueue);
@@ -126,7 +130,7 @@ public:
 };
 
 /// Each thread has a local queue to build up messages until the end of the eval() call
-class VerilatedThreadMsgQueue {
+class VerilatedThreadMsgQueue final {
     std::queue<VerilatedMsg> m_queue;
 
 public:
@@ -170,7 +174,7 @@ public:
 #endif  // VL_THREADED
 
 // FILE* list constructed from a file-descriptor
-class VerilatedFpList {
+class VerilatedFpList final {
     FILE* m_fp[31];
     std::size_t m_sz = 0;
 
@@ -189,7 +193,7 @@ public:
 //======================================================================
 // VerilatedImp
 
-class VerilatedImpData {
+class VerilatedImpData final {
     // Whole class is internal use only - Global information shared between verilated*.cpp files.
 protected:
     friend class Verilated;
@@ -207,8 +211,8 @@ protected:
         int m_timeFormatPrecision = 0;  // $timeformat number of decimal places
         int m_timeFormatWidth = 20;  // $timeformat character width
         enum { UNITS_NONE = 99 };  // Default based on precision
-        Serialized() {}
-        ~Serialized() {}
+        Serialized() = default;
+        ~Serialized() = default;
     } m_ser;
 
     VerilatedMutex m_sergMutex;  ///< Protect m_ser
@@ -260,7 +264,7 @@ protected:
     }
 };
 
-class VerilatedImp {
+class VerilatedImp final {
     // Whole class is internal use only - Global information shared between verilated*.cpp files.
 protected:
     friend class Verilated;
@@ -268,15 +272,15 @@ protected:
     // MEMBERS
     union VerilatedImpU {  ///< Enclose in an union to call ctor/dtor manually
         VerilatedImpData v;
-        VerilatedImpU() {}
-        ~VerilatedImpU() {}
+        VerilatedImpU() {}  // Can't be = default;
+        ~VerilatedImpU() {}  // Can't be = default;
     };
     static VerilatedImpU s_s;  ///< Static Singleton; One and only static this
 
 public:  // But only for verilated*.cpp
     // CONSTRUCTORS
-    VerilatedImp() {}
-    ~VerilatedImp() {}
+    VerilatedImp() = default;
+    ~VerilatedImp() = default;
     static void setup();
     static void teardown();
 

include/verilated_save.cpp

@@ -42,9 +42,10 @@
 // clang-format on
 
 // CONSTANTS
-static const char* const VLTSAVE_HEADER_STR
-    = "verilatorsave01\n";  ///< Value of first bytes of each file
-static const char* const VLTSAVE_TRAILER_STR = "vltsaved";  ///< Value of last bytes of each file
+/// Value of first bytes of each file (must be multiple of 8 bytes)
+static const char* const VLTSAVE_HEADER_STR = "verilatorsave01\n";
+/// Value of last bytes of each file (must be multiple of 8 bytes)
+static const char* const VLTSAVE_TRAILER_STR = "vltsaved";
 
 //=============================================================================
 //=============================================================================
@@ -64,10 +65,10 @@ VerilatedDeserialize& VerilatedDeserialize::readAssert(const void* __restrict da
                                                        size_t size) VL_MT_UNSAFE_ONE {
     if (VL_UNLIKELY(readDiffers(datap, size))) {
         std::string fn = filename();
-        std::string msg
-            = "Can't deserialize save-restore file as was made from different model:" + filename();
+        std::string msg = "Can't deserialize save-restore file as was made from different model: "
+                          + filename();
         VL_FATAL_MT(fn.c_str(), 0, "", msg.c_str());
-        close();
+        // Die before we close() as close would infinite loop
     }
     return *this;  // For function chaining
 }
@@ -88,9 +89,11 @@ void VerilatedDeserialize::header() VL_MT_UNSAFE_ONE {
     if (VL_UNLIKELY(os.readDiffers(VLTSAVE_HEADER_STR, strlen(VLTSAVE_HEADER_STR)))) {
         std::string fn = filename();
         std::string msg
-            = std::string("Can't deserialize; file has wrong header signature: ") + filename();
+            = std::string(
+                  "Can't deserialize; file has wrong header signature, or file not found: ")
+              + filename();
         VL_FATAL_MT(fn.c_str(), 0, "", msg.c_str());
-        close();
+        // Die before we close() as close would infinite loop
     }
     os.read(Verilated::serialized1Ptr(), Verilated::serialized1Size());
     os.read(Verilated::serialized2Ptr(), Verilated::serialized2Size());
@@ -109,7 +112,7 @@ void VerilatedDeserialize::trailer() VL_MT_UNSAFE_ONE {
         std::string msg = std::string("Can't deserialize; file has wrong end-of-file signature: ")
                           + filename();
         VL_FATAL_MT(fn.c_str(), 0, "", msg.c_str());
-        close();
+        // Die before we close() as close would infinite loop
     }
 }
 

include/verilated_save.h

@@ -28,7 +28,7 @@
 // VerilatedSerialize - convert structures to a stream representation
 // This class is not thread safe, it must be called by a single thread
 
-class VerilatedSerialize {
+class VerilatedSerialize VL_NOT_FINAL {
 protected:
     // MEMBERS
     // For speed, keep m_cp as the first member of this structure
@@ -38,8 +38,8 @@ protected:
     std::string m_filename;  ///< Filename, for error messages
     VerilatedAssertOneThread m_assertOne;  ///< Assert only called from single thread
 
-    inline static size_t bufferSize() { return 256 * 1024; }  // See below for slack calculation
-    inline static size_t bufferInsertSize() { return 16 * 1024; }
+    static constexpr size_t bufferSize() { return 256 * 1024; }  // See below for slack calculation
+    static constexpr size_t bufferInsertSize() { return 16 * 1024; }
 
     void header() VL_MT_UNSAFE_ONE;
     void trailer() VL_MT_UNSAFE_ONE;
@@ -87,7 +87,7 @@ private:
 // VerilatedDeserial - load structures from a stream representation
 // This class is not thread safe, it must be called by a single thread
 
-class VerilatedDeserialize {
+class VerilatedDeserialize VL_NOT_FINAL {
 protected:
     // MEMBERS
     // For speed, keep m_cp as the first member of this structure
@@ -98,8 +98,8 @@ protected:
     std::string m_filename;  ///< Filename, for error messages
     VerilatedAssertOneThread m_assertOne;  ///< Assert only called from single thread
 
-    inline static size_t bufferSize() { return 256 * 1024; }  // See below for slack calculation
-    inline static size_t bufferInsertSize() { return 16 * 1024; }
+    static constexpr size_t bufferSize() { return 256 * 1024; }  // See below for slack calculation
+    static constexpr size_t bufferInsertSize() { return 16 * 1024; }
 
     virtual void fill() = 0;
     void header() VL_MT_UNSAFE_ONE;
@@ -154,13 +154,13 @@ private:
 // VerilatedSave - serialize to a file
 // This class is not thread safe, it must be called by a single thread
 
-class VerilatedSave : public VerilatedSerialize {
+class VerilatedSave final : public VerilatedSerialize {
 private:
     int m_fd = -1;  ///< File descriptor we're writing to
 
 public:
     // CONSTRUCTORS
-    VerilatedSave() {}
+    VerilatedSave() = default;
     virtual ~VerilatedSave() override { close(); }
     // METHODS
     /// Open the file; call isOpen() to see if errors
@@ -174,13 +174,13 @@ public:
 // VerilatedRestore - deserialize from a file
 // This class is not thread safe, it must be called by a single thread
 
-class VerilatedRestore : public VerilatedDeserialize {
+class VerilatedRestore final : public VerilatedDeserialize {
 private:
     int m_fd = -1;  ///< File descriptor we're writing to
 
 public:
     // CONSTRUCTORS
-    VerilatedRestore() {}
+    VerilatedRestore() = default;
     virtual ~VerilatedRestore() override { close(); }
 
     // METHODS

include/verilated_sc.h

@@ -34,7 +34,7 @@
 // This class is thread safe (though most of SystemC is not).
 
 #define VL_SC_BV_DATAP(bv) (VlScBvExposer::sp_datap(bv))
-class VlScBvExposer : public sc_bv_base {
+class VlScBvExposer final : public sc_bv_base {
 public:
     static const vluint32_t* sp_datap(const sc_bv_base& base) VL_MT_SAFE {
         return static_cast<const VlScBvExposer*>(&base)->sp_datatp();

include/verilated_sym_props.h

@@ -36,16 +36,14 @@
 /// Thread safety: Assume is constructed only with model, then any number of readers
 
 // See also V3Ast::VNumRange
-class VerilatedRange {
-    int m_left;
-    int m_right;
+class VerilatedRange final {
+    int m_left = 0;
+    int m_right = 0;
 
 protected:
     friend class VerilatedVarProps;
     friend class VerilatedScope;
-    VerilatedRange()
-        : m_left{0}
-        , m_right{0} {}
+    VerilatedRange() = default;
     VerilatedRange(int left, int right)
         : m_left{left}
         , m_right{right} {}
@@ -55,7 +53,7 @@ protected:
     }
 
 public:
-    ~VerilatedRange() {}
+    ~VerilatedRange() = default;
     int left() const { return m_left; }
     int right() const { return m_right; }
     int low() const { return (m_left < m_right) ? m_left : m_right; }
@@ -70,7 +68,7 @@ public:
 /// Verilator variable
 /// Thread safety: Assume is constructed only with model, then any number of readers
 
-class VerilatedVarProps {
+class VerilatedVarProps VL_NOT_FINAL {
     // TYPES
     enum { MAGIC = 0xddc4f829 };
     // MEMBERS
@@ -138,7 +136,7 @@ public:
     }
 
 public:
-    ~VerilatedVarProps() {}
+    ~VerilatedVarProps() = default;
     // METHODS
     bool magicOk() const { return m_magic == MAGIC; }
     VerilatedVarType vltype() const { return m_vltype; }
@@ -189,7 +187,7 @@ public:
 //===========================================================================
 /// Verilator DPI open array variable
 
-class VerilatedDpiOpenVar {
+class VerilatedDpiOpenVar final {
     // MEMBERS
     const VerilatedVarProps* m_propsp;  // Variable properties
     void* m_datap;  // Location of data (local to thread always, so safe)
@@ -201,7 +199,7 @@ public:
     VerilatedDpiOpenVar(const VerilatedVarProps* propsp, const void* datap)
         : m_propsp{propsp}
         , m_datap{const_cast<void*>(datap)} {}
-    ~VerilatedDpiOpenVar() {}
+    ~VerilatedDpiOpenVar() = default;
     // METHODS
     void* datap() const { return m_datap; }
     // METHODS - from VerilatedVarProps
@@ -227,7 +225,7 @@ public:
 /// Verilator variable
 /// Thread safety: Assume is constructed only with model, then any number of readers
 
-class VerilatedVar : public VerilatedVarProps {
+class VerilatedVar final : public VerilatedVarProps {
     // MEMBERS
     void* m_datap;  // Location of data
     const char* m_namep;  // Name - slowpath
@@ -243,7 +241,7 @@ protected:
         , m_isParam{isParam} {}
 
 public:
-    ~VerilatedVar() {}
+    ~VerilatedVar() = default;
     // ACCESSORS
     void* datap() const { return m_datap; }
     const VerilatedRange& range() const { return packed(); }  // Deprecated

include/verilated_syms.h

@@ -31,6 +31,7 @@
 #include "verilated_sym_props.h"
 
 #include <map>
+#include <unordered_map>
 #include <vector>
 
 //======================================================================
@@ -42,26 +43,27 @@ struct VerilatedCStrCmp {
 };
 
 /// Map of sorted scope names to find associated scope class
-class VerilatedScopeNameMap
+class VerilatedScopeNameMap final
     : public std::map<const char*, const VerilatedScope*, VerilatedCStrCmp> {
 public:
-    VerilatedScopeNameMap() {}
-    ~VerilatedScopeNameMap() {}
+    VerilatedScopeNameMap() = default;
+    ~VerilatedScopeNameMap() = default;
 };
 
 /// Map of sorted variable names to find associated variable class
-class VerilatedVarNameMap : public std::map<const char*, VerilatedVar, VerilatedCStrCmp> {
+class VerilatedVarNameMap final : public std::map<const char*, VerilatedVar, VerilatedCStrCmp> {
 public:
-    VerilatedVarNameMap() {}
-    ~VerilatedVarNameMap() {}
+    VerilatedVarNameMap() = default;
+    ~VerilatedVarNameMap() = default;
 };
 
 typedef std::vector<const VerilatedScope*> VerilatedScopeVector;
 
-class VerilatedHierarchyMap : public std::map<const VerilatedScope*, VerilatedScopeVector> {
+class VerilatedHierarchyMap final
+    : public std::unordered_map<const VerilatedScope*, VerilatedScopeVector> {
 public:
-    VerilatedHierarchyMap() {}
-    ~VerilatedHierarchyMap() {}
+    VerilatedHierarchyMap() = default;
+    ~VerilatedHierarchyMap() = default;
 };
 
 #endif  // Guard

include/verilated_threads.cpp

@@ -98,10 +98,8 @@ VlThreadPool::VlThreadPool(int nThreads, bool profiling)
 }
 
 VlThreadPool::~VlThreadPool() {
-    for (int i = 0; i < m_workers.size(); ++i) {
-        // Each ~WorkerThread will wait for its thread to exit.
-        delete m_workers[i];
-    }
+    // Each ~WorkerThread will wait for its thread to exit.
+    for (auto& i : m_workers) delete i;
     if (VL_UNLIKELY(m_profiling)) tearDownProfilingClientThread();
 }
 
@@ -139,7 +137,7 @@ void VlThreadPool::profileDump(const char* filenamep, vluint64_t ticksElapsed) {
     if (VL_UNLIKELY(!fp)) {
         VL_FATAL_MT(filenamep, 0, "", "+prof+threads+file file not writable");
         // cppcheck-suppress resourceLeak   // bug, doesn't realize fp is nullptr
-        return;
+        return;  // LCOV_EXCL_LINE
     }
 
     // TODO Perhaps merge with verilated_coverage output format, so can

include/verilated_threads.h

@@ -22,6 +22,15 @@
 #include "verilatedos.h"
 #include "verilated.h"  // for VerilatedMutex and clang annotations
 
+#ifndef VL_THREADED
+// Hitting this likely means verilated_threads.cpp is being compiled when
+// 'verilator --threads' was not used.  'verilator --threads' sets
+// VL_THREADED.
+// Alternatively it is always safe but may harm performance to always
+// define VL_THREADED for all compiles.
+#error "verilated_threads.h/cpp expected VL_THREADED (from verilator --threads)"
+#endif
+
 #include <condition_variable>
 #include <set>
 #include <vector>
@@ -43,7 +52,7 @@ typedef void* VlThrSymTab;
 typedef void (*VlExecFnp)(bool, VlThrSymTab);
 
 /// Track dependencies for a single MTask.
-class VlMTaskVertex {
+class VlMTaskVertex final {
     // MEMBERS
     static std::atomic<vluint64_t> s_yields;  // Statistics
 
@@ -73,7 +82,7 @@ public:
     // that must notify this MTaskVertex before it will become ready
     // to run.
     explicit VlMTaskVertex(vluint32_t upstreamDepCount);
-    ~VlMTaskVertex() {}
+    ~VlMTaskVertex() = default;
 
     static vluint64_t yields() { return s_yields; }
     static void yieldThread() {
@@ -115,7 +124,7 @@ public:
 };
 
 // Profiling support
-class VlProfileRec {
+class VlProfileRec final {
 protected:
     friend class VlThreadPool;
     enum VlProfileE { TYPE_MTASK_RUN, TYPE_BARRIER };
@@ -127,7 +136,7 @@ protected:
     unsigned m_cpu;  // Execution CPU number (at start anyways)
 public:
     class Barrier {};
-    VlProfileRec() {}
+    VlProfileRec() = default;
     explicit VlProfileRec(Barrier) { m_cpu = getcpu(); }
     void startRecord(vluint64_t time, uint32_t mtask, uint32_t predict) {
         m_type = VlProfileRec::TYPE_MTASK_RUN;
@@ -159,7 +168,7 @@ public:
 
 class VlThreadPool;
 
-class VlWorkerThread {
+class VlWorkerThread final {
 private:
     // TYPES
     struct ExecRec {
@@ -238,7 +247,7 @@ public:
     static void startWorker(VlWorkerThread* workerp);
 };
 
-class VlThreadPool {
+class VlThreadPool final {
     // TYPES
     typedef std::vector<VlProfileRec> ProfileTrace;
     typedef std::set<ProfileTrace*> ProfileSet;

include/verilated_trace.h

@@ -40,7 +40,7 @@
 // Threaded tracing
 
 // A simple synchronized first in first out queue
-template <class T> class VerilatedThreadQueue {  // LCOV_EXCL_LINE  // lcov bug
+template <class T> class VerilatedThreadQueue final {  // LCOV_EXCL_LINE  // lcov bug
 private:
     VerilatedMutex m_mutex;  // Protects m_queue
     std::condition_variable_any m_cv;
@@ -83,7 +83,7 @@ public:
 
 // Commands used by thread tracing. Anonymous enum in class, as we want
 // it scoped, but we also want the automatic conversion to integer types.
-class VerilatedTraceCommand {
+class VerilatedTraceCommand final {
 public:
     // These must all fit in 4 bit at the moment, as the tracing routines
     // pack parameters in the top bits.
@@ -110,7 +110,7 @@ public:
 // VerilatedTrace uses F-bounded polymorphism to access duck-typed
 // implementations in the format specific derived class, which must be passed
 // as the type parameter T_Derived
-template <class T_Derived> class VerilatedTrace {
+template <class T_Derived> class VerilatedTrace VL_NOT_FINAL {
 public:
     //=========================================================================
     // Generic tracing internals

include/verilated_trace_imp.cpp

@@ -19,6 +19,7 @@
 
 // clang-format off
 
+#ifndef VL_CPPCHECK
 #ifndef VL_DERIVED_T
 # error "This file should be included in trace format implementations"
 #endif
@@ -558,7 +559,7 @@ template <> void VerilatedTrace<VL_DERIVED_T>::fullDouble(vluint32_t* oldp, doub
 // All of these take a destination pointer where the string will be emitted,
 // and a value to convert. There are a couple of variants for efficiency.
 
-inline static void cvtCDataToStr(char* dstp, CData value) {
+static inline void cvtCDataToStr(char* dstp, CData value) {
 #ifdef VL_HAVE_SSE2
     // Similar to cvtSDataToStr but only the bottom 8 byte lanes are used
     const __m128i a = _mm_cvtsi32_si128(value);
@@ -580,7 +581,7 @@ inline static void cvtCDataToStr(char* dstp, CData value) {
 #endif
 }
 
-inline static void cvtSDataToStr(char* dstp, SData value) {
+static inline void cvtSDataToStr(char* dstp, SData value) {
 #ifdef VL_HAVE_SSE2
     // We want each bit in the 16-bit input value to end up in a byte lane
     // within the 128-bit XMM register. Note that x86 is little-endian and we
@@ -616,7 +617,7 @@ inline static void cvtSDataToStr(char* dstp, SData value) {
 #endif
 }
 
-inline static void cvtIDataToStr(char* dstp, IData value) {
+static inline void cvtIDataToStr(char* dstp, IData value) {
 #ifdef VL_HAVE_AVX2
     // Similar to cvtSDataToStr but the bottom 16-bits are processed in the
     // top half of the YMM registerss
@@ -635,9 +636,11 @@ inline static void cvtIDataToStr(char* dstp, IData value) {
 #endif
 }
 
-inline static void cvtQDataToStr(char* dstp, QData value) {
+static inline void cvtQDataToStr(char* dstp, QData value) {
     cvtIDataToStr(dstp, value >> 32);
     cvtIDataToStr(dstp + 32, value);
 }
 
 #define cvtEDataToStr cvtIDataToStr
+
+#endif  // VL_CPPCHECK

include/verilated_vcd_c.h

@@ -34,13 +34,13 @@ class VerilatedVcd;
 // VerilatedFile
 /// File handling routines, which can be overrode for e.g. socket I/O
 
-class VerilatedVcdFile {
+class VerilatedVcdFile final {
 private:
     int m_fd = 0;  ///< File descriptor we're writing to
 public:
     // METHODS
-    VerilatedVcdFile() {}
-    virtual ~VerilatedVcdFile() {}
+    VerilatedVcdFile() = default;
+    virtual ~VerilatedVcdFile() = default;
     virtual bool open(const std::string& name) VL_MT_UNSAFE;
     virtual void close() VL_MT_UNSAFE;
     virtual ssize_t write(const char* bufp, ssize_t len) VL_MT_UNSAFE;
@@ -51,7 +51,7 @@ public:
 /// Base class to create a Verilator VCD dump
 /// This is an internally used class - see VerilatedVcdC for what to call from applications
 
-class VerilatedVcd : public VerilatedTrace<VerilatedVcd> {
+class VerilatedVcd VL_NOT_FINAL : public VerilatedTrace<VerilatedVcd> {
 private:
     // Give the superclass access to private bits (to avoid virtual functions)
     friend class VerilatedTrace<VerilatedVcd>;
@@ -76,7 +76,7 @@ private:
     std::vector<char> m_suffixes;  ///< VCD line end string codes + metadata
     const char* m_suffixesp;  ///< Pointer to first element of above
 
-    typedef std::map<std::string, std::string> NameMap;
+    typedef std::map<const std::string, const std::string> NameMap;
     NameMap* m_namemapp = nullptr;  ///< List of names for the header
 
     void bufferResize(vluint64_t minsize);
@@ -329,7 +329,7 @@ template <> void VerilatedTrace<VerilatedVcd>::set_time_resolution(const std::st
 /// Also derived for use in SystemC simulations.
 /// Thread safety: Unless otherwise indicated, every function is VL_MT_UNSAFE_ONE
 
-class VerilatedVcdC {
+class VerilatedVcdC VL_NOT_FINAL {
     VerilatedVcd m_sptrace;  ///< Trace file being created
 
     // CONSTRUCTORS

include/verilated_vcd_sc.h

@@ -31,7 +31,7 @@
 /// This class is passed to the SystemC simulation kernel, just like a
 /// documented SystemC trace format.
 
-class VerilatedVcdSc : sc_trace_file, public VerilatedVcdC {
+class VerilatedVcdSc final : sc_trace_file, public VerilatedVcdC {
     // CONSTRUCTORS
     VL_UNCOPYABLE(VerilatedVcdSc);
 

include/verilated_vpi.cpp

@@ -55,15 +55,15 @@ constexpr unsigned VL_VPI_LINE_SIZE = 8192;
 // Implementation
 
 // Base VPI handled object
-class VerilatedVpio {
+class VerilatedVpio VL_NOT_FINAL {
     // MEM MANGLEMENT
     static VL_THREAD_LOCAL vluint8_t* t_freeHead;
 
 public:
     // CONSTRUCTORS
-    VerilatedVpio() {}
-    virtual ~VerilatedVpio() {}
-    inline static void* operator new(size_t size) VL_MT_SAFE {
+    VerilatedVpio() = default;
+    virtual ~VerilatedVpio() = default;
+    static void* operator new(size_t size) VL_MT_SAFE {
         // We new and delete tons of vpi structures, so keep them around
         // To simplify our free list, we use a size large enough for all derived types
         // We reserve word zero for the next pointer, as that's safer in case a
@@ -79,13 +79,13 @@ public:
         vluint8_t* newp = reinterpret_cast<vluint8_t*>(::operator new(chunk + 8));
         return newp + 8;
     }
-    inline static void operator delete(void* obj, size_t /*size*/)VL_MT_SAFE {
+    static void operator delete(void* obj, size_t /*size*/)VL_MT_SAFE {
         vluint8_t* oldp = (static_cast<vluint8_t*>(obj)) - 8;
         *(reinterpret_cast<void**>(oldp)) = t_freeHead;
         t_freeHead = oldp;
     }
     // MEMBERS
-    static inline VerilatedVpio* castp(vpiHandle h) {
+    static VerilatedVpio* castp(vpiHandle h) {
         return dynamic_cast<VerilatedVpio*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     inline vpiHandle castVpiHandle() { return reinterpret_cast<vpiHandle>(this); }
@@ -96,12 +96,12 @@ public:
     virtual vluint32_t type() const { return 0; }
     virtual vluint32_t size() const { return 0; }
     virtual const VerilatedRange* rangep() const { return nullptr; }
-    virtual vpiHandle dovpi_scan() { return 0; }
+    virtual vpiHandle dovpi_scan() { return nullptr; }
 };
 
 typedef PLI_INT32 (*VerilatedPliCb)(struct t_cb_data*);
 
-class VerilatedVpioCb : public VerilatedVpio {
+class VerilatedVpioCb final : public VerilatedVpio {
     t_cb_data m_cbData;
     s_vpi_value m_value;
     QData m_time;
@@ -114,8 +114,8 @@ public:
         m_value.format = cbDatap->value ? cbDatap->value->format : vpiSuppressVal;
         m_cbData.value = &m_value;
     }
-    virtual ~VerilatedVpioCb() override {}
-    static inline VerilatedVpioCb* castp(vpiHandle h) {
+    virtual ~VerilatedVpioCb() override = default;
+    static VerilatedVpioCb* castp(vpiHandle h) {
         return dynamic_cast<VerilatedVpioCb*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     virtual vluint32_t type() const override { return vpiCallback; }
@@ -125,21 +125,21 @@ public:
     QData time() const { return m_time; }
 };
 
-class VerilatedVpioConst : public VerilatedVpio {
+class VerilatedVpioConst final : public VerilatedVpio {
     vlsint32_t m_num;
 
 public:
     explicit VerilatedVpioConst(vlsint32_t num)
         : m_num{num} {}
-    virtual ~VerilatedVpioConst() override {}
-    static inline VerilatedVpioConst* castp(vpiHandle h) {
+    virtual ~VerilatedVpioConst() override = default;
+    static VerilatedVpioConst* castp(vpiHandle h) {
         return dynamic_cast<VerilatedVpioConst*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     virtual vluint32_t type() const override { return vpiConstant; }
     vlsint32_t num() const { return m_num; }
 };
 
-class VerilatedVpioParam : public VerilatedVpio {
+class VerilatedVpioParam final : public VerilatedVpio {
     const VerilatedVar* m_varp;
     const VerilatedScope* m_scopep;
 
@@ -148,9 +148,9 @@ public:
         : m_varp{varp}
         , m_scopep{scopep} {}
 
-    virtual ~VerilatedVpioParam() override {}
+    virtual ~VerilatedVpioParam() override = default;
 
-    static inline VerilatedVpioParam* castp(vpiHandle h) {
+    static VerilatedVpioParam* castp(vpiHandle h) {
         return dynamic_cast<VerilatedVpioParam*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     virtual vluint32_t type() const override { return vpiParameter; }
@@ -159,21 +159,21 @@ public:
     const VerilatedScope* scopep() const { return m_scopep; }
     virtual const char* name() const override { return m_varp->name(); }
     virtual const char* fullname() const override {
-        static VL_THREAD_LOCAL std::string out;
-        out = std::string(m_scopep->name()) + "." + name();
-        return out.c_str();
+        static VL_THREAD_LOCAL std::string t_out;
+        t_out = std::string(m_scopep->name()) + "." + name();
+        return t_out.c_str();
     }
 };
 
-class VerilatedVpioRange : public VerilatedVpio {
+class VerilatedVpioRange final : public VerilatedVpio {
     const VerilatedRange* m_range;
     vlsint32_t m_iteration = 0;
 
 public:
     explicit VerilatedVpioRange(const VerilatedRange* range)
         : m_range{range} {}
-    virtual ~VerilatedVpioRange() override {}
-    static inline VerilatedVpioRange* castp(vpiHandle h) {
+    virtual ~VerilatedVpioRange() override = default;
+    static VerilatedVpioRange* castp(vpiHandle h) {
         return dynamic_cast<VerilatedVpioRange*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     virtual vluint32_t type() const override { return vpiRange; }
@@ -187,19 +187,19 @@ public:
             nextp->iterationInc();
             return ((nextp)->castVpiHandle());
         }
-        return 0;  // End of list - only one deep
+        return nullptr;  // End of list - only one deep
     }
 };
 
-class VerilatedVpioScope : public VerilatedVpio {
+class VerilatedVpioScope VL_NOT_FINAL : public VerilatedVpio {
 protected:
     const VerilatedScope* m_scopep;
 
 public:
     explicit VerilatedVpioScope(const VerilatedScope* scopep)
         : m_scopep{scopep} {}
-    virtual ~VerilatedVpioScope() override {}
-    static inline VerilatedVpioScope* castp(vpiHandle h) {
+    virtual ~VerilatedVpioScope() override = default;
+    static VerilatedVpioScope* castp(vpiHandle h) {
         return dynamic_cast<VerilatedVpioScope*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     virtual vluint32_t type() const override { return vpiScope; }
@@ -208,10 +208,10 @@ public:
     virtual const char* fullname() const override { return m_scopep->name(); }
 };
 
-class VerilatedVpioVar : public VerilatedVpio {
+class VerilatedVpioVar VL_NOT_FINAL : public VerilatedVpio {
     const VerilatedVar* m_varp;
     const VerilatedScope* m_scopep;
-    vluint8_t* m_prevDatap;  // Previous value of data, for cbValueChange
+    vluint8_t* m_prevDatap = nullptr;  // Previous value of data, for cbValueChange
     union {
         vluint8_t u8[4];
         vluint32_t u32;
@@ -219,7 +219,7 @@ class VerilatedVpioVar : public VerilatedVpio {
     vluint32_t m_entSize;  // memoized variable size
 protected:
     void* m_varDatap;  // varp()->datap() adjusted for array entries
-    vlsint32_t m_index;
+    vlsint32_t m_index = 0;
     const VerilatedRange& get_range() const {
         // Determine number of dimensions and return outermost
         return (m_varp->dims() > 1) ? m_varp->unpacked() : m_varp->packed();
@@ -228,9 +228,7 @@ protected:
 public:
     VerilatedVpioVar(const VerilatedVar* varp, const VerilatedScope* scopep)
         : m_varp{varp}
-        , m_scopep{scopep}
-        , m_index{0} {
-        m_prevDatap = nullptr;
+        , m_scopep{scopep} {
         m_mask.u32 = VL_MASK_I(varp->packed().elements());
         m_entSize = varp->entSize();
         m_varDatap = varp->datap();
@@ -238,7 +236,7 @@ public:
     virtual ~VerilatedVpioVar() override {
         if (m_prevDatap) VL_DO_CLEAR(delete[] m_prevDatap, m_prevDatap = nullptr);
     }
-    static inline VerilatedVpioVar* castp(vpiHandle h) {
+    static VerilatedVpioVar* castp(vpiHandle h) {
         return dynamic_cast<VerilatedVpioVar*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     const VerilatedVar* varp() const { return m_varp; }
@@ -254,9 +252,9 @@ public:
     virtual const VerilatedRange* rangep() const override { return &get_range(); }
     virtual const char* name() const override { return m_varp->name(); }
     virtual const char* fullname() const override {
-        static VL_THREAD_LOCAL std::string out;
-        out = std::string(m_scopep->name()) + "." + name();
-        return out.c_str();
+        static VL_THREAD_LOCAL std::string t_out;
+        t_out = std::string(m_scopep->name()) + "." + name();
+        return t_out.c_str();
     }
     void* prevDatap() const { return m_prevDatap; }
     void* varDatap() const { return m_varDatap; }
@@ -268,7 +266,7 @@ public:
     }
 };
 
-class VerilatedVpioMemoryWord : public VerilatedVpioVar {
+class VerilatedVpioMemoryWord final : public VerilatedVpioVar {
 public:
     VerilatedVpioMemoryWord(const VerilatedVar* varp, const VerilatedScope* scopep,
                             vlsint32_t index, int offset)
@@ -276,23 +274,23 @@ public:
         m_index = index;
         m_varDatap = (static_cast<vluint8_t*>(varp->datap())) + entSize() * offset;
     }
-    virtual ~VerilatedVpioMemoryWord() override {}
-    static inline VerilatedVpioMemoryWord* castp(vpiHandle h) {
+    virtual ~VerilatedVpioMemoryWord() override = default;
+    static VerilatedVpioMemoryWord* castp(vpiHandle h) {
         return dynamic_cast<VerilatedVpioMemoryWord*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     virtual vluint32_t type() const override { return vpiMemoryWord; }
     virtual vluint32_t size() const override { return varp()->packed().elements(); }
     virtual const VerilatedRange* rangep() const override { return &(varp()->packed()); }
     virtual const char* fullname() const override {
-        static VL_THREAD_LOCAL std::string out;
+        static VL_THREAD_LOCAL std::string t_out;
         char num[20];
         sprintf(num, "%d", m_index);
-        out = std::string(scopep()->name()) + "." + name() + "[" + num + "]";
-        return out.c_str();
+        t_out = std::string(scopep()->name()) + "." + name() + "[" + num + "]";
+        return t_out.c_str();
     }
 };
 
-class VerilatedVpioVarIter : public VerilatedVpio {
+class VerilatedVpioVarIter final : public VerilatedVpio {
     const VerilatedScope* m_scopep;
     VerilatedVarNameMap::const_iterator m_it;
     bool m_started = false;
@@ -300,8 +298,8 @@ class VerilatedVpioVarIter : public VerilatedVpio {
 public:
     explicit VerilatedVpioVarIter(const VerilatedScope* scopep)
         : m_scopep{scopep} {}
-    virtual ~VerilatedVpioVarIter() override {}
-    static inline VerilatedVpioVarIter* castp(vpiHandle h) {
+    virtual ~VerilatedVpioVarIter() override = default;
+    static VerilatedVpioVarIter* castp(vpiHandle h) {
         return dynamic_cast<VerilatedVpioVarIter*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     virtual vluint32_t type() const override { return vpiIterator; }
@@ -312,18 +310,18 @@ public:
                 m_it = varsp->begin();
                 m_started = true;
             } else if (VL_UNLIKELY(m_it == varsp->end())) {
-                return 0;
+                return nullptr;
             } else {
                 ++m_it;
             }
-            if (m_it == varsp->end()) return 0;
+            if (m_it == varsp->end()) return nullptr;
             return ((new VerilatedVpioVar(&(m_it->second), m_scopep))->castVpiHandle());
         }
-        return 0;  // End of list - only one deep
+        return nullptr;  // End of list - only one deep
     }
 };
 
-class VerilatedVpioMemoryWordIter : public VerilatedVpio {
+class VerilatedVpioMemoryWordIter final : public VerilatedVpio {
     const vpiHandle m_handle;
     const VerilatedVar* m_varp;
     vlsint32_t m_iteration;
@@ -336,8 +334,8 @@ public:
         , m_varp{varp}
         , m_iteration{varp->unpacked().right()}
         , m_direction{VL_LIKELY(varp->unpacked().left() > varp->unpacked().right()) ? 1 : -1} {}
-    virtual ~VerilatedVpioMemoryWordIter() override {}
-    static inline VerilatedVpioMemoryWordIter* castp(vpiHandle h) {
+    virtual ~VerilatedVpioMemoryWordIter() override = default;
+    static VerilatedVpioMemoryWordIter* castp(vpiHandle h) {
         return dynamic_cast<VerilatedVpioMemoryWordIter*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     virtual vluint32_t type() const override { return vpiIterator; }
@@ -346,14 +344,14 @@ public:
     }
     virtual vpiHandle dovpi_scan() override {
         vpiHandle result;
-        if (m_done) return 0;
+        if (m_done) return nullptr;
         result = vpi_handle_by_index(m_handle, m_iteration);
         iterationInc();
         return result;
     }
 };
 
-class VerilatedVpioModule : public VerilatedVpioScope {
+class VerilatedVpioModule final : public VerilatedVpioScope {
     const char* m_name;
     const char* m_fullname;
 
@@ -364,7 +362,7 @@ public:
         if (strncmp(m_fullname, "TOP.", 4) == 0) m_fullname += 4;
         m_name = m_scopep->identifier();
     }
-    static inline VerilatedVpioModule* castp(vpiHandle h) {
+    static VerilatedVpioModule* castp(vpiHandle h) {
         return dynamic_cast<VerilatedVpioModule*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     virtual vluint32_t type() const override { return vpiModule; }
@@ -372,7 +370,7 @@ public:
     virtual const char* fullname() const override { return m_fullname; }
 };
 
-class VerilatedVpioModuleIter : public VerilatedVpio {
+class VerilatedVpioModuleIter final : public VerilatedVpio {
     const std::vector<const VerilatedScope*>* m_vec;
     std::vector<const VerilatedScope*>::const_iterator m_it;
 
@@ -381,13 +379,13 @@ public:
         : m_vec{&vec} {
         m_it = m_vec->begin();
     }
-    virtual ~VerilatedVpioModuleIter() override {}
-    static inline VerilatedVpioModuleIter* castp(vpiHandle h) {
+    virtual ~VerilatedVpioModuleIter() override = default;
+    static VerilatedVpioModuleIter* castp(vpiHandle h) {
         return dynamic_cast<VerilatedVpioModuleIter*>(reinterpret_cast<VerilatedVpio*>(h));
     }
     virtual vluint32_t type() const override { return vpiIterator; }
     virtual vpiHandle dovpi_scan() override {
-        if (m_it == m_vec->end()) return 0;
+        if (m_it == m_vec->end()) return nullptr;
         const VerilatedScope* modp = *m_it++;
         return (new VerilatedVpioModule(modp))->castVpiHandle();
     }
@@ -407,15 +405,11 @@ struct VerilatedVpiTimedCbsCmp {
 
 class VerilatedVpiError;
 
-class VerilatedVpiImp {
+class VerilatedVpiImp final {
     enum { CB_ENUM_MAX_VALUE = cbAtEndOfSimTime + 1 };  // Maxium callback reason
     typedef std::list<VerilatedVpioCb*> VpioCbList;
     typedef std::set<std::pair<QData, VerilatedVpioCb*>, VerilatedVpiTimedCbsCmp> VpioTimedCbs;
 
-    struct product_info {
-        PLI_BYTE8* product;
-    };
-
     VpioCbList m_cbObjLists[CB_ENUM_MAX_VALUE];  // Callbacks for each supported reason
     VpioTimedCbs m_timedCbs;  // Time based callbacks
     VerilatedVpiError* m_errorInfop = nullptr;  // Container for vpi error info
@@ -424,8 +418,8 @@ class VerilatedVpiImp {
     static VerilatedVpiImp s_s;  // Singleton
 
 public:
-    VerilatedVpiImp() {}
-    ~VerilatedVpiImp() {}
+    VerilatedVpiImp() = default;
+    ~VerilatedVpiImp() = default;
     static void assertOneCheck() { s_s.m_assertOne.check(); }
     static void cbReasonAdd(VerilatedVpioCb* vop) {
         if (vop->reason() == cbValueChange) {
@@ -477,26 +471,38 @@ public:
     static bool callCbs(vluint32_t reason) VL_MT_UNSAFE_ONE {
         VpioCbList& cbObjList = s_s.m_cbObjLists[reason];
         bool called = false;
-        for (auto it = cbObjList.begin(); it != cbObjList.end();) {
+        if (cbObjList.empty()) return called;
+        const auto last = std::prev(cbObjList.end());  // prevent looping over newly added elements
+        for (auto it = cbObjList.begin(); true;) {
+            // cbReasonRemove sets to nullptr, so we know on removal the old end() will still exist
+            bool was_last = it == last;
             if (VL_UNLIKELY(!*it)) {  // Deleted earlier, cleanup
                 it = cbObjList.erase(it);
+                if (was_last) break;
                 continue;
             }
             VerilatedVpioCb* vop = *it++;
             VL_DEBUG_IF_PLI(VL_DBG_MSGF("- vpi: reason_callback %d %p\n", reason, vop););
             (vop->cb_rtnp())(vop->cb_datap());
             called = true;
+            if (was_last) break;
         }
         return called;
     }
-    static void callValueCbs() VL_MT_UNSAFE_ONE {
+    static bool callValueCbs() VL_MT_UNSAFE_ONE {
         assertOneCheck();
         VpioCbList& cbObjList = s_s.m_cbObjLists[cbValueChange];
-        typedef std::set<VerilatedVpioVar*> VpioVarSet;
+        bool called = false;
+        typedef std::unordered_set<VerilatedVpioVar*> VpioVarSet;
         VpioVarSet update;  // set of objects to update after callbacks
-        for (auto it = cbObjList.begin(); it != cbObjList.end();) {
+        if (cbObjList.empty()) return called;
+        const auto last = std::prev(cbObjList.end());  // prevent looping over newly added elements
+        for (auto it = cbObjList.begin(); true;) {
+            // cbReasonRemove sets to nullptr, so we know on removal the old end() will still exist
+            bool was_last = it == last;
             if (VL_UNLIKELY(!*it)) {  // Deleted earlier, cleanup
                 it = cbObjList.erase(it);
+                if (was_last) break;
                 continue;
             }
             VerilatedVpioCb* vop = *it++;
@@ -512,16 +518,19 @@ public:
                     update.insert(varop);
                     vpi_get_value(vop->cb_datap()->obj, vop->cb_datap()->value);
                     (vop->cb_rtnp())(vop->cb_datap());
+                    called = true;
                 }
             }
+            if (was_last) break;
         }
         for (const auto& ip : update) { memcpy(ip->prevDatap(), ip->varDatap(), ip->entSize()); }
+        return called;
     }
 
     static VerilatedVpiError* error_info() VL_MT_UNSAFE_ONE;  // getter for vpi error info
 };
 
-class VerilatedVpiError {
+class VerilatedVpiError final {
     //// Container for vpi error info
 
     t_vpi_error_info m_errorInfo;
@@ -550,7 +559,7 @@ public:
         m_buff[0] = '\0';
         m_errorInfo.product = const_cast<PLI_BYTE8*>(Verilated::productName());
     }
-    ~VerilatedVpiError() {}
+    ~VerilatedVpiError() = default;
     static void selfTest() VL_MT_UNSAFE_ONE;
     VerilatedVpiError* setMessage(PLI_INT32 level) {
         m_flag = true;
@@ -559,14 +568,14 @@ public:
     }
     void setMessage(const std::string& file, PLI_INT32 line, const char* message, ...) {
         // message cannot be a const string& as va_start cannot use a reference
-        static VL_THREAD_LOCAL std::string filehold;
+        static VL_THREAD_LOCAL std::string t_filehold;
         va_list args;
         va_start(args, message);
         VL_VSNPRINTF(m_buff, sizeof(m_buff), message, args);
         va_end(args);
         m_errorInfo.state = vpiPLI;
-        filehold = file;
-        setError((PLI_BYTE8*)m_buff, nullptr, const_cast<PLI_BYTE8*>(filehold.c_str()), line);
+        t_filehold = file;
+        setError((PLI_BYTE8*)m_buff, nullptr, const_cast<PLI_BYTE8*>(t_filehold.c_str()), line);
     }
     p_vpi_error_info getError() {
         if (m_flag) return &m_errorInfo;
@@ -599,7 +608,7 @@ VL_THREAD_LOCAL vluint8_t* VerilatedVpio::t_freeHead = nullptr;
 
 void VerilatedVpi::callTimedCbs() VL_MT_UNSAFE_ONE { VerilatedVpiImp::callTimedCbs(); }
 
-void VerilatedVpi::callValueCbs() VL_MT_UNSAFE_ONE { VerilatedVpiImp::callValueCbs(); }
+bool VerilatedVpi::callValueCbs() VL_MT_UNSAFE_ONE { return VerilatedVpiImp::callValueCbs(); }
 
 bool VerilatedVpi::callCbs(vluint32_t reason) VL_MT_UNSAFE_ONE {
     return VerilatedVpiImp::callCbs(reason);
@@ -1048,10 +1057,10 @@ vpiHandle vpi_register_cb(p_cb_data cb_data_p) {
     }
 }
 
-PLI_INT32 vpi_remove_cb(vpiHandle object) {
-    VL_DEBUG_IF_PLI(VL_DBG_MSGF("- vpi: vpi_remove_cb %p\n", object););
+PLI_INT32 vpi_remove_cb(vpiHandle cb_obj) {
+    VL_DEBUG_IF_PLI(VL_DBG_MSGF("- vpi: vpi_remove_cb %p\n", cb_obj););
     VerilatedVpiImp::assertOneCheck();
-    VerilatedVpioCb* vop = VerilatedVpioCb::castp(object);
+    VerilatedVpioCb* vop = VerilatedVpioCb::castp(cb_obj);
     _VL_VPI_ERROR_RESET();
     if (VL_UNLIKELY(!vop)) return 0;
     if (vop->cb_datap()->reason == cbAfterDelay) {
@@ -1065,7 +1074,7 @@ PLI_INT32 vpi_remove_cb(vpiHandle object) {
 void vpi_get_cb_info(vpiHandle /*object*/, p_cb_data /*cb_data_p*/) { _VL_VPI_UNIMP(); }
 vpiHandle vpi_register_systf(p_vpi_systf_data /*systf_data_p*/) {
     _VL_VPI_UNIMP();
-    return 0;
+    return nullptr;
 }
 void vpi_get_systf_info(vpiHandle /*object*/, p_vpi_systf_data /*systf_data_p*/) {
     _VL_VPI_UNIMP();
@@ -1131,24 +1140,24 @@ vpiHandle vpi_handle_by_index(vpiHandle object, PLI_INT32 indx) {
     VerilatedVpioVar* varop = VerilatedVpioVar::castp(object);
     _VL_VPI_ERROR_RESET();
     if (VL_LIKELY(varop)) {
-        if (varop->varp()->dims() < 2) return 0;
+        if (varop->varp()->dims() < 2) return nullptr;
         if (VL_LIKELY(varop->varp()->unpacked().left() >= varop->varp()->unpacked().right())) {
             if (VL_UNLIKELY(indx > varop->varp()->unpacked().left()
                             || indx < varop->varp()->unpacked().right()))
-                return 0;
+                return nullptr;
             return (new VerilatedVpioMemoryWord(varop->varp(), varop->scopep(), indx,
                                                 indx - varop->varp()->unpacked().right()))
                 ->castVpiHandle();
         }
         if (VL_UNLIKELY(indx < varop->varp()->unpacked().left()
                         || indx > varop->varp()->unpacked().right()))
-            return 0;
+            return nullptr;
         return (new VerilatedVpioMemoryWord(varop->varp(), varop->scopep(), indx,
                                             indx - varop->varp()->unpacked().left()))
             ->castVpiHandle();
     }
     _VL_VPI_INTERNAL(__FILE__, __LINE__, "%s : can't resolve handle", VL_FUNC);
-    return 0;
+    return nullptr;
 }
 
 // for traversing relationships
@@ -1160,56 +1169,56 @@ vpiHandle vpi_handle(PLI_INT32 type, vpiHandle object) {
     switch (type) {
     case vpiLeftRange: {
         if (VerilatedVpioVar* vop = VerilatedVpioVar::castp(object)) {
-            if (VL_UNLIKELY(!vop->rangep())) return 0;
+            if (VL_UNLIKELY(!vop->rangep())) return nullptr;
             return (new VerilatedVpioConst(vop->rangep()->left()))->castVpiHandle();
         } else if (VerilatedVpioRange* vop = VerilatedVpioRange::castp(object)) {
-            if (VL_UNLIKELY(!vop->rangep())) return 0;
+            if (VL_UNLIKELY(!vop->rangep())) return nullptr;
             return (new VerilatedVpioConst(vop->rangep()->left()))->castVpiHandle();
         }
         _VL_VPI_WARNING(__FILE__, __LINE__,
                         "%s: Unsupported vpiHandle (%p) for type %s, nothing will be returned",
                         VL_FUNC, object, VerilatedVpiError::strFromVpiMethod(type));
-        return 0;
+        return nullptr;
     }
     case vpiRightRange: {
         if (VerilatedVpioVar* vop = VerilatedVpioVar::castp(object)) {
-            if (VL_UNLIKELY(!vop->rangep())) return 0;
+            if (VL_UNLIKELY(!vop->rangep())) return nullptr;
             return (new VerilatedVpioConst(vop->rangep()->right()))->castVpiHandle();
         } else if (VerilatedVpioRange* vop = VerilatedVpioRange::castp(object)) {
-            if (VL_UNLIKELY(!vop->rangep())) return 0;
+            if (VL_UNLIKELY(!vop->rangep())) return nullptr;
             return (new VerilatedVpioConst(vop->rangep()->right()))->castVpiHandle();
         }
         _VL_VPI_WARNING(__FILE__, __LINE__,
                         "%s: Unsupported vpiHandle (%p) for type %s, nothing will be returned",
                         VL_FUNC, object, VerilatedVpiError::strFromVpiMethod(type));
-        return 0;
+        return nullptr;
     }
     case vpiIndex: {
         VerilatedVpioVar* vop = VerilatedVpioVar::castp(object);
-        if (VL_UNLIKELY(!vop)) return 0;
+        if (VL_UNLIKELY(!vop)) return nullptr;
         return (new VerilatedVpioConst(vop->index()))->castVpiHandle();
     }
     case vpiScope: {
         VerilatedVpioVar* vop = VerilatedVpioVar::castp(object);
-        if (VL_UNLIKELY(!vop)) return 0;
+        if (VL_UNLIKELY(!vop)) return nullptr;
         return (new VerilatedVpioScope(vop->scopep()))->castVpiHandle();
     }
     case vpiParent: {
         VerilatedVpioMemoryWord* vop = VerilatedVpioMemoryWord::castp(object);
-        if (VL_UNLIKELY(!vop)) return 0;
+        if (VL_UNLIKELY(!vop)) return nullptr;
         return (new VerilatedVpioVar(vop->varp(), vop->scopep()))->castVpiHandle();
     }
     default:
         _VL_VPI_WARNING(__FILE__, __LINE__, "%s: Unsupported type %s, nothing will be returned",
                         VL_FUNC, VerilatedVpiError::strFromVpiMethod(type));
-        return 0;
+        return nullptr;
     }
 }
 
 vpiHandle vpi_handle_multi(PLI_INT32 /*type*/, vpiHandle /*refHandle1*/, vpiHandle /*refHandle2*/,
                            ...) {
     _VL_VPI_UNIMP();
-    return 0;
+    return nullptr;
 }
 
 vpiHandle vpi_iterate(PLI_INT32 type, vpiHandle object) {
@@ -1219,8 +1228,8 @@ vpiHandle vpi_iterate(PLI_INT32 type, vpiHandle object) {
     switch (type) {
     case vpiMemoryWord: {
         VerilatedVpioVar* vop = VerilatedVpioVar::castp(object);
-        if (VL_UNLIKELY(!vop)) return 0;
-        if (vop->varp()->dims() < 2) return 0;
+        if (VL_UNLIKELY(!vop)) return nullptr;
+        if (vop->varp()->dims() < 2) return nullptr;
         if (vop->varp()->dims() > 2) {
             _VL_VPI_WARNING(__FILE__, __LINE__,
                             "%s: %s, object %s has unsupported number of indices (%d)", VL_FUNC,
@@ -1231,8 +1240,8 @@ vpiHandle vpi_iterate(PLI_INT32 type, vpiHandle object) {
     }
     case vpiRange: {
         VerilatedVpioVar* vop = VerilatedVpioVar::castp(object);
-        if (VL_UNLIKELY(!vop)) return 0;
-        if (vop->varp()->dims() < 2) return 0;
+        if (VL_UNLIKELY(!vop)) return nullptr;
+        if (vop->varp()->dims() < 2) return nullptr;
         // Unsupported is multidim list
         if (vop->varp()->dims() > 2) {
             _VL_VPI_WARNING(__FILE__, __LINE__,
@@ -1244,7 +1253,7 @@ vpiHandle vpi_iterate(PLI_INT32 type, vpiHandle object) {
     }
     case vpiReg: {
         VerilatedVpioScope* vop = VerilatedVpioScope::castp(object);
-        if (VL_UNLIKELY(!vop)) return 0;
+        if (VL_UNLIKELY(!vop)) return nullptr;
         return ((new VerilatedVpioVarIter(vop->scopep()))->castVpiHandle());
     }
     case vpiModule: {
@@ -1252,13 +1261,13 @@ vpiHandle vpi_iterate(PLI_INT32 type, vpiHandle object) {
         const VerilatedHierarchyMap* map = VerilatedImp::hierarchyMap();
         const VerilatedScope* mod = vop ? vop->scopep() : nullptr;
         const auto it = vlstd::as_const(map)->find(const_cast<VerilatedScope*>(mod));
-        if (it == map->end()) return 0;
+        if (it == map->end()) return nullptr;
         return ((new VerilatedVpioModuleIter(it->second))->castVpiHandle());
     }
     default:
         _VL_VPI_WARNING(__FILE__, __LINE__, "%s: Unsupported type %s, nothing will be returned",
                         VL_FUNC, VerilatedVpiError::strFromVpiObjType(type));
-        return 0;
+        return nullptr;
     }
 }
 vpiHandle vpi_scan(vpiHandle object) {
@@ -1342,7 +1351,7 @@ PLI_BYTE8* vpi_get_str(PLI_INT32 property, vpiHandle object) {
     default:
         _VL_VPI_WARNING(__FILE__, __LINE__, "%s: Unsupported type %s, nothing will be returned",
                         VL_FUNC, VerilatedVpiError::strFromVpiProp(property));
-        return 0;
+        return nullptr;
     }
 }
 
@@ -1410,34 +1419,34 @@ void vl_get_value(const VerilatedVar* varp, void* varDatap, p_vpi_value valuep,
                   const char* fullname) {
     if (!vl_check_format(varp, valuep, fullname, true)) return;
     // Maximum required size is for binary string, one byte per bit plus null termination
-    static VL_THREAD_LOCAL char outStr[1 + VL_MULS_MAX_WORDS * 32];
+    static VL_THREAD_LOCAL char t_outStr[1 + VL_MULS_MAX_WORDS * 32];
     // cppcheck-suppress variableScope
-    static VL_THREAD_LOCAL int outStrSz = sizeof(outStr) - 1;
+    static VL_THREAD_LOCAL int t_outStrSz = sizeof(t_outStr) - 1;
     // We used to presume vpiValue.format = vpiIntVal or if single bit vpiScalarVal
     // This may cause backward compatibility issues with older code.
     if (valuep->format == vpiVectorVal) {
         // Vector pointer must come from our memory pool
         // It only needs to persist until the next vpi_get_value
-        static VL_THREAD_LOCAL t_vpi_vecval out[VL_MULS_MAX_WORDS * 2];
-        valuep->value.vector = out;
+        static VL_THREAD_LOCAL t_vpi_vecval t_out[VL_MULS_MAX_WORDS * 2];
+        valuep->value.vector = t_out;
         if (varp->vltype() == VLVT_UINT8) {
-            out[0].aval = *(reinterpret_cast<CData*>(varDatap));
-            out[0].bval = 0;
+            t_out[0].aval = *(reinterpret_cast<CData*>(varDatap));
+            t_out[0].bval = 0;
             return;
         } else if (varp->vltype() == VLVT_UINT16) {
-            out[0].aval = *(reinterpret_cast<SData*>(varDatap));
-            out[0].bval = 0;
+            t_out[0].aval = *(reinterpret_cast<SData*>(varDatap));
+            t_out[0].bval = 0;
             return;
         } else if (varp->vltype() == VLVT_UINT32) {
-            out[0].aval = *(reinterpret_cast<IData*>(varDatap));
-            out[0].bval = 0;
+            t_out[0].aval = *(reinterpret_cast<IData*>(varDatap));
+            t_out[0].bval = 0;
             return;
         } else if (varp->vltype() == VLVT_UINT64) {
             QData data = *(reinterpret_cast<QData*>(varDatap));
-            out[1].aval = static_cast<IData>(data >> 32ULL);
-            out[1].bval = 0;
-            out[0].aval = static_cast<IData>(data);
-            out[0].bval = 0;
+            t_out[1].aval = static_cast<IData>(data >> 32ULL);
+            t_out[1].bval = 0;
+            t_out[0].aval = static_cast<IData>(data);
+            t_out[0].bval = 0;
             return;
         } else if (varp->vltype() == VLVT_WDATA) {
             int words = VL_WORDS_I(varp->packed().elements());
@@ -1448,47 +1457,47 @@ void vl_get_value(const VerilatedVar* varp, void* varDatap, p_vpi_value valuep,
             }
             WDataInP datap = (reinterpret_cast<EData*>(varDatap));
             for (int i = 0; i < words; ++i) {
-                out[i].aval = datap[i];
-                out[i].bval = 0;
+                t_out[i].aval = datap[i];
+                t_out[i].bval = 0;
             }
             return;
         }
     } else if (valuep->format == vpiBinStrVal) {
-        valuep->value.str = outStr;
+        valuep->value.str = t_outStr;
         int bits = varp->packed().elements();
         CData* datap = (reinterpret_cast<CData*>(varDatap));
         int i;
-        if (bits > outStrSz) {
+        if (bits > t_outStrSz) {
             // limit maximum size of output to size of buffer to prevent overrun.
-            bits = outStrSz;
+            bits = t_outStrSz;
             _VL_VPI_WARNING(
                 __FILE__, __LINE__,
                 "%s: Truncating string value of %s for %s"
                 " as buffer size (%d, VL_MULS_MAX_WORDS=%d) is less than required (%d)",
-                VL_FUNC, VerilatedVpiError::strFromVpiVal(valuep->format), fullname, outStrSz,
+                VL_FUNC, VerilatedVpiError::strFromVpiVal(valuep->format), fullname, t_outStrSz,
                 VL_MULS_MAX_WORDS, bits);
         }
         for (i = 0; i < bits; ++i) {
             char val = (datap[i >> 3] >> (i & 7)) & 1;
-            outStr[bits - i - 1] = val ? '1' : '0';
+            t_outStr[bits - i - 1] = val ? '1' : '0';
         }
-        outStr[i] = '\0';
+        t_outStr[i] = '\0';
         return;
     } else if (valuep->format == vpiOctStrVal) {
-        valuep->value.str = outStr;
+        valuep->value.str = t_outStr;
         int chars = (varp->packed().elements() + 2) / 3;
         int bytes = VL_BYTES_I(varp->packed().elements());
         CData* datap = (reinterpret_cast<CData*>(varDatap));
         int i;
-        if (chars > outStrSz) {
+        if (chars > t_outStrSz) {
             // limit maximum size of output to size of buffer to prevent overrun.
             _VL_VPI_WARNING(
                 __FILE__, __LINE__,
                 "%s: Truncating string value of %s for %s"
                 " as buffer size (%d, VL_MULS_MAX_WORDS=%d) is less than required (%d)",
-                VL_FUNC, VerilatedVpiError::strFromVpiVal(valuep->format), fullname, outStrSz,
+                VL_FUNC, VerilatedVpiError::strFromVpiVal(valuep->format), fullname, t_outStrSz,
                 VL_MULS_MAX_WORDS, chars);
-            chars = outStrSz;
+            chars = t_outStrSz;
         }
         for (i = 0; i < chars; ++i) {
             div_t idx = div(i * 3, 8);
@@ -1509,44 +1518,44 @@ void vl_get_value(const VerilatedVar* varp, void* varDatap, p_vpi_value valuep,
                     val &= (1 << rem) - 1;
                 }
             }
-            outStr[chars - i - 1] = '0' + (val & 7);
+            t_outStr[chars - i - 1] = '0' + (val & 7);
         }
-        outStr[i] = '\0';
+        t_outStr[i] = '\0';
         return;
     } else if (valuep->format == vpiDecStrVal) {
-        valuep->value.str = outStr;
+        valuep->value.str = t_outStr;
         // outStrSz does not include nullptr termination so add one
         if (varp->vltype() == VLVT_UINT8) {
-            VL_SNPRINTF(outStr, outStrSz + 1, "%hhu",
+            VL_SNPRINTF(t_outStr, t_outStrSz + 1, "%hhu",
                         static_cast<unsigned char>(*(reinterpret_cast<CData*>(varDatap))));
             return;
         } else if (varp->vltype() == VLVT_UINT16) {
-            VL_SNPRINTF(outStr, outStrSz + 1, "%hu",
+            VL_SNPRINTF(t_outStr, t_outStrSz + 1, "%hu",
                         static_cast<unsigned short>(*(reinterpret_cast<SData*>(varDatap))));
             return;
         } else if (varp->vltype() == VLVT_UINT32) {
-            VL_SNPRINTF(outStr, outStrSz + 1, "%u",
+            VL_SNPRINTF(t_outStr, t_outStrSz + 1, "%u",
                         static_cast<unsigned int>(*(reinterpret_cast<IData*>(varDatap))));
             return;
         } else if (varp->vltype() == VLVT_UINT64) {
-            VL_SNPRINTF(outStr, outStrSz + 1, "%llu",
+            VL_SNPRINTF(t_outStr, t_outStrSz + 1, "%llu",
                         static_cast<unsigned long long>(*(reinterpret_cast<QData*>(varDatap))));
             return;
         }
     } else if (valuep->format == vpiHexStrVal) {
-        valuep->value.str = outStr;
+        valuep->value.str = t_outStr;
         int chars = (varp->packed().elements() + 3) >> 2;
         CData* datap = (reinterpret_cast<CData*>(varDatap));
         int i;
-        if (chars > outStrSz) {
+        if (chars > t_outStrSz) {
             // limit maximum size of output to size of buffer to prevent overrun.
             _VL_VPI_WARNING(
                 __FILE__, __LINE__,
                 "%s: Truncating string value of %s for %s"
                 " as buffer size (%d, VL_MULS_MAX_WORDS=%d) is less than required (%d)",
-                VL_FUNC, VerilatedVpiError::strFromVpiVal(valuep->format), fullname, outStrSz,
+                VL_FUNC, VerilatedVpiError::strFromVpiVal(valuep->format), fullname, t_outStrSz,
                 VL_MULS_MAX_WORDS, chars);
-            chars = outStrSz;
+            chars = t_outStrSz;
         }
         for (i = 0; i < chars; ++i) {
             char val = (datap[i >> 1] >> ((i & 1) << 2)) & 15;
@@ -1559,35 +1568,35 @@ void vl_get_value(const VerilatedVar* varp, void* varDatap, p_vpi_value valuep,
                     val &= (1 << rem) - 1;
                 }
             }
-            outStr[chars - i - 1] = "0123456789abcdef"[static_cast<int>(val)];
+            t_outStr[chars - i - 1] = "0123456789abcdef"[static_cast<int>(val)];
         }
-        outStr[i] = '\0';
+        t_outStr[i] = '\0';
         return;
     } else if (valuep->format == vpiStringVal) {
         if (varp->vltype() == VLVT_STRING) {
             valuep->value.str = reinterpret_cast<char*>(varDatap);
             return;
         } else {
-            valuep->value.str = outStr;
+            valuep->value.str = t_outStr;
             int bytes = VL_BYTES_I(varp->packed().elements());
             CData* datap = (reinterpret_cast<CData*>(varDatap));
             int i;
-            if (bytes > outStrSz) {
+            if (bytes > t_outStrSz) {
                 // limit maximum size of output to size of buffer to prevent overrun.
                 _VL_VPI_WARNING(
                     __FILE__, __LINE__,
                     "%s: Truncating string value of %s for %s"
                     " as buffer size (%d, VL_MULS_MAX_WORDS=%d) is less than required (%d)",
-                    VL_FUNC, VerilatedVpiError::strFromVpiVal(valuep->format), fullname, outStrSz,
-                    VL_MULS_MAX_WORDS, bytes);
-                bytes = outStrSz;
+                    VL_FUNC, VerilatedVpiError::strFromVpiVal(valuep->format), fullname,
+                    t_outStrSz, VL_MULS_MAX_WORDS, bytes);
+                bytes = t_outStrSz;
             }
             for (i = 0; i < bytes; ++i) {
                 char val = datap[bytes - i - 1];
                 // other simulators replace [leading?] zero chars with spaces, replicate here.
-                outStr[i] = val ? val : ' ';
+                t_outStr[i] = val ? val : ' ';
             }
-            outStr[i] = '\0';
+            t_outStr[i] = '\0';
             return;
         }
     } else if (valuep->format == vpiIntVal) {
@@ -1639,7 +1648,7 @@ vpiHandle vpi_put_value(vpiHandle object, p_vpi_value valuep, p_vpi_time /*time_
     _VL_VPI_ERROR_RESET();
     if (VL_UNLIKELY(!valuep)) {
         _VL_VPI_WARNING(__FILE__, __LINE__, "Ignoring vpi_put_value with nullptr value pointer");
-        return 0;
+        return nullptr;
     }
     if (VerilatedVpioVar* vop = VerilatedVpioVar::castp(object)) {
         VL_DEBUG_IF_PLI(
@@ -1652,9 +1661,9 @@ vpiHandle vpi_put_value(vpiHandle object, p_vpi_value valuep, p_vpi_time /*time_
                             "Ignoring vpi_put_value to signal marked read-only,"
                             " use public_flat_rw instead: %s",
                             vop->fullname());
-            return 0;
+            return nullptr;
         }
-        if (!vl_check_format(vop->varp(), valuep, vop->fullname(), false)) return 0;
+        if (!vl_check_format(vop->varp(), valuep, vop->fullname(), false)) return nullptr;
         if (valuep->format == vpiVectorVal) {
             if (VL_UNLIKELY(!valuep->value.vector)) return nullptr;
             if (vop->varp()->vltype() == VLVT_UINT8) {
@@ -1755,7 +1764,7 @@ vpiHandle vpi_put_value(vpiHandle object, p_vpi_value valuep, p_vpi_time /*time_
                 _VL_VPI_ERROR(__FILE__, __LINE__, "%s: Parsing failed for '%s' as value %s for %s",
                               VL_FUNC, valuep->value.str,
                               VerilatedVpiError::strFromVpiVal(valuep->format), vop->fullname());
-                return 0;
+                return nullptr;
             }
             if (success > 1) {
                 _VL_VPI_WARNING(__FILE__, __LINE__,
@@ -1844,11 +1853,11 @@ vpiHandle vpi_put_value(vpiHandle object, p_vpi_value valuep, p_vpi_time /*time_
     } else if (VerilatedVpioParam* vop = VerilatedVpioParam::castp(object)) {
         _VL_VPI_WARNING(__FILE__, __LINE__, "%s: Ignoring vpi_put_value to vpiParameter: %s",
                         VL_FUNC, vop->fullname());
-        return 0;
+        return nullptr;
     } else if (VerilatedVpioConst* vop = VerilatedVpioConst::castp(object)) {
         _VL_VPI_WARNING(__FILE__, __LINE__, "%s: Ignoring vpi_put_value to vpiConstant: %s",
                         VL_FUNC, vop->fullname());
-        return 0;
+        return nullptr;
     }
     _VL_VPI_ERROR(__FILE__, __LINE__, "%s: Unsupported vpiHandle (%p)", VL_FUNC, object);
     return nullptr;
@@ -1910,7 +1919,7 @@ PLI_UINT32 vpi_mcd_close(PLI_UINT32 mcd) {
 
 PLI_BYTE8* vpi_mcd_name(PLI_UINT32 /*mcd*/) {
     _VL_VPI_UNIMP();
-    return 0;
+    return nullptr;
 }
 
 PLI_INT32 vpi_mcd_printf(PLI_UINT32 mcd, PLI_BYTE8* formatp, ...) {
@@ -2020,7 +2029,7 @@ PLI_INT32 vpi_put_data(PLI_INT32 /*id*/, PLI_BYTE8* /*dataLoc*/, PLI_INT32 /*num
 }
 void* vpi_get_userdata(vpiHandle /*obj*/) {
     _VL_VPI_UNIMP();
-    return 0;
+    return nullptr;
 }
 PLI_INT32 vpi_put_userdata(vpiHandle /*obj*/, void* /*userdata*/) {
     _VL_VPI_UNIMP();
@@ -2051,5 +2060,5 @@ PLI_INT32 vpi_control(PLI_INT32 operation, ...) {
 vpiHandle vpi_handle_by_multi_index(vpiHandle /*obj*/, PLI_INT32 /*num_index*/,
                                     PLI_INT32* /*index_array*/) {
     _VL_VPI_UNIMP();
-    return 0;
+    return nullptr;
 }

include/verilated_vpi.h

@@ -33,14 +33,14 @@
 
 //======================================================================
 
-class VerilatedVpi {
+class VerilatedVpi final {
 public:
     /// Call timed callbacks
     /// Users should call this from their main loops
     static void callTimedCbs() VL_MT_UNSAFE_ONE;
     /// Call value based callbacks
     /// Users should call this from their main loops
-    static void callValueCbs() VL_MT_UNSAFE_ONE;
+    static bool callValueCbs() VL_MT_UNSAFE_ONE;
     /// Call callbacks of arbitrary types
     /// Users can call this from their application code
     static bool callCbs(vluint32_t reason) VL_MT_UNSAFE_ONE;

include/verilatedos.h

@@ -374,7 +374,10 @@ typedef unsigned long long vluint64_t;  ///< 64-bit unsigned type
 //=========================================================================
 // Class definition helpers
 
-// Used to declare a class as uncopyable; put after a private:
+/// Used to indicate a base class, e.g. cannot label "class final"
+#define VL_NOT_FINAL
+
+/// Used to declare a class as uncopyable; put after a private:
 #define VL_UNCOPYABLE(Type) \
     Type(const Type& other) = delete; \
     Type& operator=(const Type&) = delete

nodist/code_coverage

@@ -83,28 +83,28 @@ sub test {
     require "./nodist/code_coverage.dat";
 
     if ($Opt_Stages{1}) {
-        travis_fold_start("configure");
+        ci_fold_start("configure");
         print "Stage 1: configure (coverage on)\n";
         run("make distclean || true");
         run("autoconf");
         # Exceptions can pollute the branch coverage data
         run("./configure --enable-longtests CXX='g++ --coverage -fno-exceptions -DVL_GCOV'");
-        travis_fold_end();
+        ci_fold_end();
     }
 
     if ($Opt_Stages{2}) {
-        travis_fold_start("build");
+        ci_fold_start("build");
         print "Stage 2: build\n";
         my $nproc = Unix::Processors->new->max_online;
         run("make -k -j $nproc VERILATOR_NO_OPT_BUILD=1");
         # The optimized versions will not collect good coverage, overwrite them
         run("cp bin/verilator_bin_dbg bin/verilator_bin");
         run("cp bin/verilator_coverage_bin_dbg bin/verilator_coverage_bin");
-        travis_fold_end();
+        ci_fold_end();
     }
 
     if ($Opt_Stages{3}) {
-        travis_fold_start("test");
+        ci_fold_start("test");
         print "Stage 3: make tests (with coverage on)\n";
         if ($#Opt_Tests < 0) {
             run("make examples VERILATOR_NO_OPT_BUILD=1")
@@ -121,12 +121,12 @@ sub test {
                 run($test);
             }
         }
-        travis_fold_end();
+        ci_fold_end();
     }
 
     my $cc_dir = "nodist/obj_dir/coverage";
     if ($Opt_Stages{4}) {
-        travis_fold_start("gcno");
+        ci_fold_start("gcno");
         print "Stage 4: Create gcno files under $cc_dir\n";
         mkpath($cc_dir);
         mkpath("$cc_dir/info");
@@ -165,11 +165,11 @@ sub test {
                 }
             }
         }
-        travis_fold_end();
+        ci_fold_end();
     }
 
     if ($Opt_Stages{5} && $Opt_Fastcov) {
-        travis_fold_start("fastcov");
+        ci_fold_start("fastcov");
         # Must run in root directory to find all files
         mkpath($cc_dir);
         #run("${RealBin}/fastcov.py -b -c src/obj_dbg -X".
@@ -178,11 +178,11 @@ sub test {
         run("${RealBin}/fastcov.py -b -c src/obj_dbg -X --lcov".
             " --exclude /usr --exclude test_regress"
             ." -o ${cc_dir}/app_total.info");
-        travis_fold_end();
+        ci_fold_end();
     }
 
     if ($Opt_Stages{5} && !$Opt_Fastcov) {
-        travis_fold_start("infos");
+        ci_fold_start("infos");
         print "Stage 5: make infos\n";
         my $dats = `find . -print | grep .gcda`;
         my %dirs;
@@ -199,20 +199,20 @@ sub test {
                             })->run;
         }
         $Fork->wait_all;
-        travis_fold_end();
+        ci_fold_end();
     }
 
     if ($Opt_Stages{6}) {
-        travis_fold_start("clone");
+        ci_fold_start("clone");
         # No control file to override single lines, so replicate the sources
         # Also lets us see the insertion markers in the HTML source res
         print "Stage 6: Clone sources under $cc_dir\n";
         clone_sources($cc_dir);
-        travis_fold_end();
+        ci_fold_end();
     }
 
     if ($Opt_Stages{8} && !$Opt_Fastcov) {
-        travis_fold_start("copy");
+        ci_fold_start("copy");
         print "Stage 8: Copy .gcno files\n";
         my $dats = `find . -print | grep .gcno`;
         foreach my $dat (sort (split '\n', $dats)) {
@@ -221,11 +221,11 @@ sub test {
             #print "cp $dat, $outdat);\n";
             cp($dat, $outdat);
         }
-        travis_fold_end();
+        ci_fold_end();
     }
 
     if ($Opt_Stages{10} && !$Opt_Fastcov) {
-        travis_fold_start("combine");
+        ci_fold_start("combine");
         print "Stage 10: Combine data files\n";
         {
             run("cd $cc_dir ; lcov -c -i -d src/obj_dbg -o app_base.info");
@@ -243,11 +243,11 @@ sub test {
                 }
             }
         }
-        travis_fold_end();
+        ci_fold_end();
     }
 
     if ($Opt_Stages{11}) {
-        travis_fold_start("dirs");
+        ci_fold_start("dirs");
         print "Stage 11: Cleanup paths\n";
         if ($Opt_Fastcov) {
             cleanup_abs_paths_info($cc_dir, "$cc_dir/app_total.info", "$cc_dir/app_total.info");
@@ -255,11 +255,11 @@ sub test {
         } else {
             cleanup_abs_paths_info($cc_dir, "$cc_dir/app_total.info", "$cc_dir/app_total.info");
         }
-        travis_fold_end();
+        ci_fold_end();
     }
 
     if ($Opt_Stages{12}) {
-        travis_fold_start("filter");
+        ci_fold_start("filter");
         print "Stage 12: Filter processed source files\n";
         my $inc = '';
         foreach my $glob (@Source_Globs) {
@@ -282,24 +282,24 @@ sub test {
         } else {
             run("cd $cc_dir ; lcov --remove app_total.info $exc -o app_total_f.info");
         }
-        travis_fold_end();
+        ci_fold_end();
     }
 
     if ($Opt_Stages{17}) {
-        travis_fold_start("report");
+        ci_fold_start("report");
         print "Stage 17: Create HTML\n";
         run("cd $cc_dir ; genhtml app_total_f.info --demangle-cpp"
             ." --rc lcov_branch_coverage=1 --rc genhtml_hi_limit=100 --output-directory html");
-        travis_fold_end();
+        ci_fold_end();
     }
 
     if ($Opt_Stages{18}) {
-        travis_fold_start("upload");
+        ci_fold_start("upload");
         print "Stage 18: Upload\n";
         my $cmd = "bash <(curl -s https://codecov.io/bash) -f $cc_dir/app_total.info";
         print "print: Not running: export CODECOV_TOKEN=<hidden>\n";
         print "print: Not running: $cmd\n";
-        travis_fold_end();
+        ci_fold_end();
     }
 
     if ($Opt_Stages{19}) {
@@ -425,13 +425,13 @@ sub run {
     ($status == 0) or die "%Error: Command Failed $command, $status, stopped";
 }
 
-our $_Travis_Action;
-sub travis_fold_start {
-    $_Travis_Action = shift;
-    print "travis_fold:start:$_Travis_Action\n";
+our $_Ci_Action;
+sub ci_fold_start {
+    $_Ci_Action = shift;
+    print "travis_fold:start:$_Ci_Action\n";
 }
-sub travis_fold_end {
-    print "travis_fold:end:$_Travis_Action\n";
+sub ci_fold_end {
+    print "travis_fold:end:$_Ci_Action\n";
 }
 
 #######################################################################

nodist/code_coverage.dat

@@ -46,14 +46,18 @@ remove_gcda_regexp(qr!test_regress/.*/(Vt_|Vtop_).*\.gcda!);
 exclude_line_regexp(qr/(\bv3fatalSrc\b
                     |\bfatalSrc\b
                     |\bVL_UNCOVERABLE\b
+                    |\bVL_UNREACHABLE\b
                     |\bVL_FATAL
                     |\bUASSERT
+                    |\bNUM_ASSERT
                     |\bERROR_RSVD_WORD
                     |\bV3ERROR_NA
                     |\bUINFO\b)/x);
 
 # Exclude for branch coverage only
 exclude_branch_regexp(qr/(\bdebug\(\)
+                         |\bassert\(
+                         |\bBROKEN_RTK\(
                          |\bSELF_CHECK)/x);
 
 1;

nodist/invoke_atsim

@@ -9,7 +9,7 @@ use strict;
 # main
 
 eval `modulecmd perl add axiom-athdl`;
-exec('atsim',@ARGV);
+exec('atsim', @ARGV);
 
 #######################################################################
 __END__
@@ -22,7 +22,7 @@ invoke_atsim - Invoke tool under "modules" command
 
 =head1 SYNOPSIS
 
-  invoke_atsim  {ncv arguments}
+  invoke_atsim {arguments}
 
 =head1 DESCRIPTION
 

nodist/invoke_iccr

@@ -9,7 +9,7 @@ use strict;
 # main
 
 eval `modulecmd perl add cds-ius`;
-exec('iccr',@ARGV);
+exec('iccr', @ARGV);
 
 #######################################################################
 __END__
@@ -22,7 +22,7 @@ invoke_iccr - Invoke tool under "modules" command
 
 =head1 SYNOPSIS
 
-  invoke_iccr  {ncv arguments}
+  invoke_iccr {arguments}
 
 =head1 DESCRIPTION
 

nodist/invoke_ncverilog

@@ -9,7 +9,7 @@ use strict;
 # main
 
 eval `modulecmd perl add cds-ius/latest`;
-exec('ncverilog',@ARGV);
+exec('ncverilog', @ARGV);
 
 #######################################################################
 __END__
@@ -22,7 +22,7 @@ invoke_ncverilog - Invoke tool under "modules" command
 
 =head1 SYNOPSIS
 
-  invoke_ncverilog  {ncv arguments}
+  invoke_ncverilog {arguments}
 
 =head1 DESCRIPTION
 

nodist/invoke_vcs

@@ -9,7 +9,7 @@ use strict;
 # main
 
 eval `modulecmd perl add synopsys-sim/latest`;
-exec('vcs',@ARGV);
+exec('vcs', @ARGV);
 
 #######################################################################
 __END__
@@ -22,7 +22,7 @@ invoke_vcs - Invoke tool under "modules" command
 
 =head1 SYNOPSIS
 
-  invoke_vcs  {ncv arguments}
+  invoke_vcs {arguments}
 
 =head1 DESCRIPTION
 

src/.gdbinit

@@ -7,21 +7,21 @@
 # SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 
 define pn
-  call $arg0->dumpGdb()
+  call AstNode::dumpGdb($arg0)
 end
 document pn
   Verilator: Print single AstNode NODEP
 end
 
 define pnt
-  call $arg0->dumpTreeGdb()
+  call AstNode::dumpTreeGdb($arg0)
 end
 document pnt
   Verilator: Print AstNode NODEP's tree
 end
 
 define dtf
-  call AstNode::dumpTreeFileGdb(0)
+  call AstNode::dumpTreeFileGdb($arg0, 0)
 end
 document dtf
   Verilator: Dump AstNode tree to file

src/Makefile.in

@@ -81,6 +81,10 @@ prefiles:: config_rev.h
 config_rev.h:	${srcdir}/config_rev.pl $(GIT_CHANGE_DEP)
 	$(PERL) ${srcdir}/config_rev.pl ${srcdir} >$@
 
+# Human convenience
+clang-format:
+	$(MAKE) -C .. $@
+
 maintainer-copy::
 clean mostlyclean distclean maintainer-clean::
 	-rm -rf obj_* *.log *.dmp *.vpd core

src/Makefile_obj.in

@@ -94,7 +94,6 @@ LIBS = $(CFG_LIBS) -lm
 
 CPPFLAGS += -MMD
 CPPFLAGS += -I. -I$(bldsrc) -I$(srcdir) -I$(incdir) -I../../include
-CPPFLAGS += -DYYDEBUG 	# Required to get nice error messages
 #CPPFLAGS += -DVL_LEAK_CHECKS 	# If running valgrind or other hunting tool
 CPPFLAGS += $(COPT)
 CPPFLAGS += -MP # Only works on recent GCC versions

src/V3Active.cpp

@@ -43,12 +43,12 @@
 //######################################################################
 // Collect existing active names
 
-class ActiveBaseVisitor : public AstNVisitor {
+class ActiveBaseVisitor VL_NOT_FINAL : public AstNVisitor {
 protected:
     VL_DEBUG_FUNC;  // Declare debug()
 };
 
-class ActiveNamer : public ActiveBaseVisitor {
+class ActiveNamer final : public ActiveBaseVisitor {
 private:
     // STATE
     AstScope* m_scopep = nullptr;  // Current scope to add statement to
@@ -130,15 +130,15 @@ public:
     }
 
     // CONSTRUCTORS
-    ActiveNamer() {}
-    virtual ~ActiveNamer() override {}
+    ActiveNamer() = default;
+    virtual ~ActiveNamer() override = default;
     void main(AstScope* nodep) { iterate(nodep); }
 };
 
 //######################################################################
 // Active AssignDly replacement functions
 
-class ActiveDlyVisitor : public ActiveBaseVisitor {
+class ActiveDlyVisitor final : public ActiveBaseVisitor {
 public:
     enum CheckType : uint8_t { CT_SEQ, CT_COMBO, CT_INITIAL, CT_LATCH };
 
@@ -205,13 +205,13 @@ public:
         , m_alwaysp{nodep} {
         iterate(nodep);
     }
-    virtual ~ActiveDlyVisitor() override {}
+    virtual ~ActiveDlyVisitor() override = default;
 };
 
 //######################################################################
 // Active class functions
 
-class ActiveVisitor : public ActiveBaseVisitor {
+class ActiveVisitor final : public ActiveBaseVisitor {
 private:
     // NODE STATE
     //  Each call to V3Const::constify
@@ -364,6 +364,14 @@ private:
         }
         visitAlways(nodep, nodep->sensesp(), nodep->keyword());
     }
+    virtual void visit(AstAlwaysPostponed* nodep) override {
+        UINFO(4, "    ALW   " << nodep << endl);
+        if (!nodep->bodysp()) {
+            VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
+            return;
+        }
+        visitAlways(nodep, nullptr, VAlwaysKwd::ALWAYS);
+    }
     virtual void visit(AstAlwaysPublic* nodep) override {
         // Move always to appropriate ACTIVE based on its sense list
         UINFO(4, "    ALWPub   " << nodep << endl);
@@ -406,7 +414,7 @@ private:
 public:
     // CONSTRUCTORS
     explicit ActiveVisitor(AstNetlist* nodep) { iterate(nodep); }
-    virtual ~ActiveVisitor() override {}
+    virtual ~ActiveVisitor() override = default;
 };
 
 //######################################################################

src/V3Active.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Active {
+class V3Active final {
 public:
     static void activeAll(AstNetlist* nodep);
 };

src/V3ActiveTop.cpp

@@ -35,7 +35,7 @@
 //######################################################################
 // Active class functions
 
-class ActiveTopVisitor : public AstNVisitor {
+class ActiveTopVisitor final : public AstNVisitor {
 private:
     // NODE STATE
     //  Entire netlist
@@ -128,7 +128,7 @@ private:
 public:
     // CONSTRUCTORS
     explicit ActiveTopVisitor(AstNetlist* nodep) { iterate(nodep); }
-    virtual ~ActiveTopVisitor() override {}
+    virtual ~ActiveTopVisitor() override = default;
 };
 
 //######################################################################

src/V3ActiveTop.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3ActiveTop {
+class V3ActiveTop final {
 public:
     static void activeTopAll(AstNetlist* nodep);
 };

src/V3Assert.cpp

@@ -26,7 +26,7 @@
 //######################################################################
 // Assert class functions
 
-class AssertVisitor : public AstNVisitor {
+class AssertVisitor final : public AstNVisitor {
 private:
     // NODE STATE/TYPES
     // Cleared on netlist
@@ -36,7 +36,11 @@ private:
     // STATE
     AstNodeModule* m_modp = nullptr;  // Last module
     AstBegin* m_beginp = nullptr;  // Last begin
+    unsigned m_monitorNum = 0;  // Global $monitor numbering (not per module)
+    AstVar* m_monitorNumVarp = nullptr;  // $monitor number variable
+    AstVar* m_monitorOffVarp = nullptr;  // $monitoroff variable
     unsigned m_modPastNum = 0;  // Module past numbering
+    unsigned m_modStrobeNum = 0;  // Module $strobe numbering
     VDouble0 m_statCover;  // Statistic tracking
     VDouble0 m_statAsNotImm;  // Statistic tracking
     VDouble0 m_statAsImm;  // Statistic tracking
@@ -62,7 +66,26 @@ private:
             nodep->fmtp()->scopeNamep(new AstScopeName(nodep->fileline()));
         }
     }
-
+    AstVarRef* newMonitorNumVarRefp(AstNode* nodep, VAccess access) {
+        if (!m_monitorNumVarp) {
+            m_monitorNumVarp = new AstVar{nodep->fileline(), AstVarType::MODULETEMP,
+                                          "__VmonitorNum", nodep->findUInt64DType()};
+            v3Global.rootp()->dollarUnitPkgAddp()->addStmtp(m_monitorNumVarp);
+        }
+        const auto varrefp = new AstVarRef(nodep->fileline(), m_monitorNumVarp, access);
+        varrefp->classOrPackagep(v3Global.rootp()->dollarUnitPkgAddp());
+        return varrefp;
+    }
+    AstVarRef* newMonitorOffVarRefp(AstNode* nodep, VAccess access) {
+        if (!m_monitorOffVarp) {
+            m_monitorOffVarp = new AstVar{nodep->fileline(), AstVarType::MODULETEMP,
+                                          "__VmonitorOff", nodep->findBitDType()};
+            v3Global.rootp()->dollarUnitPkgAddp()->addStmtp(m_monitorOffVarp);
+        }
+        const auto varrefp = new AstVarRef(nodep->fileline(), m_monitorOffVarp, access);
+        varrefp->classOrPackagep(v3Global.rootp()->dollarUnitPkgAddp());
+        return varrefp;
+    }
     AstNode* newIfAssertOn(AstNode* nodep) {
         // Add a internal if to check assertions are on.
         // Don't make this a AND term, as it's unlikely to need to test this.
@@ -73,7 +96,7 @@ private:
                         // This allows syntax errors and such to be detected normally.
                         (v3Global.opt.assertOn()
                              ? static_cast<AstNode*>(new AstCMath(fl, "Verilated::assertOn()", 1))
-                             : static_cast<AstNode*>(new AstConst(fl, AstConst::LogicFalse()))),
+                             : static_cast<AstNode*>(new AstConst(fl, AstConst::BitFalse()))),
                         nodep, nullptr);
         newp->user1(true);  // Don't assert/cover this if
         return newp;
@@ -207,7 +230,7 @@ private:
             bool allow_none = nodep->unique0Pragma();
 
             // Empty case means no property
-            if (!propp) propp = new AstConst(nodep->fileline(), AstConst::LogicFalse());
+            if (!propp) propp = new AstConst(nodep->fileline(), AstConst::BitFalse());
 
             // Note: if this ends with an 'else', then we don't need to validate that one of the
             // predicates evaluates to true.
@@ -276,7 +299,7 @@ private:
                         }
                     }
                     // Empty case means no property
-                    if (!propp) propp = new AstConst(nodep->fileline(), AstConst::LogicFalse());
+                    if (!propp) propp = new AstConst(nodep->fileline(), AstConst::BitFalse());
 
                     bool allow_none = has_default || nodep->unique0Pragma();
                     AstNode* ohot
@@ -317,12 +340,12 @@ private:
                                          "_Vpast_" + cvtToStr(m_modPastNum++) + "_" + cvtToStr(i),
                                          inp->dtypep());
             m_modp->addStmtp(outvarp);
-            AstNode* assp = new AstAssignDly(nodep->fileline(),
-                                             new AstVarRef(nodep->fileline(), outvarp, true), inp);
+            AstNode* assp = new AstAssignDly(
+                nodep->fileline(), new AstVarRef(nodep->fileline(), outvarp, VAccess::WRITE), inp);
             alwaysp->addStmtp(assp);
             // if (debug() >= 9) assp->dumpTree(cout, "-ass: ");
             invarp = outvarp;
-            inp = new AstVarRef(nodep->fileline(), invarp, false);
+            inp = new AstVarRef(nodep->fileline(), invarp, VAccess::READ);
         }
         nodep->replaceWith(inp);
     }
@@ -342,9 +365,54 @@ private:
         } else if (nodep->displayType() == AstDisplayType::DT_ERROR
                    || nodep->displayType() == AstDisplayType::DT_FATAL) {
             replaceDisplay(nodep, "%%Error");
+        } else if (nodep->displayType() == AstDisplayType::DT_MONITOR) {
+            nodep->displayType(AstDisplayType::DT_DISPLAY);
+            const auto fl = nodep->fileline();
+            const auto monNum = ++m_monitorNum;
+            // Where $monitor was we do "__VmonitorNum = N;"
+            const auto newsetp = new AstAssign{fl, newMonitorNumVarRefp(nodep, VAccess::WRITE),
+                                               new AstConst{fl, monNum}};
+            nodep->replaceWith(newsetp);
+            // Add "always_comb if (__VmonitorOn && __VmonitorNum==N) $display(...);"
+            AstNode* stmtsp = nodep;
+            AstIf* ifp = new AstIf{
+                fl,
+                new AstLogAnd{fl, new AstLogNot{fl, newMonitorOffVarRefp(nodep, VAccess::READ)},
+                              new AstEq{fl, new AstConst{fl, monNum},
+                                        newMonitorNumVarRefp(nodep, VAccess::READ)}},
+                stmtsp, nullptr};
+            ifp->branchPred(VBranchPred::BP_UNLIKELY);
+            AstNode* newp = new AstAlwaysPostponed{fl, ifp};
+            m_modp->addStmtp(newp);
+        } else if (nodep->displayType() == AstDisplayType::DT_STROBE) {
+            nodep->displayType(AstDisplayType::DT_DISPLAY);
+            // Need one-shot
+            const auto fl = nodep->fileline();
+            const auto varp
+                = new AstVar{fl, AstVarType::MODULETEMP, "__Vstrobe" + cvtToStr(m_modStrobeNum++),
+                             nodep->findBitDType()};
+            m_modp->addStmtp(varp);
+            // Where $strobe was we do "__Vstrobe = '1;"
+            const auto newsetp = new AstAssign{fl, new AstVarRef{fl, varp, VAccess::WRITE},
+                                               new AstConst{fl, AstConst::BitTrue{}}};
+            nodep->replaceWith(newsetp);
+            // Add "always_comb if (__Vstrobe) begin $display(...); __Vstrobe = '0; end"
+            AstNode* stmtsp = nodep;
+            AstIf* ifp = new AstIf{fl, new AstVarRef{fl, varp, VAccess::READ}, stmtsp, nullptr};
+            ifp->branchPred(VBranchPred::BP_UNLIKELY);
+            AstNode* newp = new AstAlwaysPostponed{fl, ifp};
+            stmtsp->addNext(new AstAssign{fl, new AstVarRef{fl, varp, VAccess::WRITE},
+                                          new AstConst{fl, AstConst::BitFalse{}}});
+            m_modp->addStmtp(newp);
         }
     }
-
+    virtual void visit(AstMonitorOff* nodep) override {
+        const auto newp
+            = new AstAssign(nodep->fileline(), newMonitorOffVarRefp(nodep, VAccess::WRITE),
+                            new AstConst(nodep->fileline(), AstConst::BitTrue{}, nodep->off()));
+        nodep->replaceWith(newp);
+        VL_DO_DANGLING(pushDeletep(nodep), nodep);
+    }
     virtual void visit(AstAssert* nodep) override {
         iterateChildren(nodep);
         newPslAssertion(nodep, nodep->failsp());
@@ -362,9 +430,11 @@ private:
     virtual void visit(AstNodeModule* nodep) override {
         VL_RESTORER(m_modp);
         VL_RESTORER(m_modPastNum);
+        VL_RESTORER(m_modStrobeNum);
         {
             m_modp = nodep;
             m_modPastNum = 0;
+            m_modStrobeNum = 0;
             iterateChildren(nodep);
         }
     }

src/V3Assert.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Assert {
+class V3Assert final {
 public:
     static void assertAll(AstNetlist* nodep);
 };

src/V3AssertPre.cpp

@@ -26,7 +26,7 @@
 //######################################################################
 // Assert class functions
 
-class AssertPreVisitor : public AstNVisitor {
+class AssertPreVisitor final : public AstNVisitor {
     // Removes clocks and other pre-optimizations
     // Eventually inlines calls to sequences, properties, etc.
     // We're not parsing the tree, or anything more complicated.
@@ -39,6 +39,8 @@ private:
     AstSenItem* m_senip = nullptr;  // Last sensitivity
     // Reset each always:
     AstSenItem* m_seniAlwaysp = nullptr;  // Last sensitivity in always
+    // Reset each assertion:
+    AstNode* m_disablep = nullptr;  // Last disable
 
     // METHODS
     VL_DEBUG_FUNC;  // Declare debug()
@@ -58,7 +60,10 @@ private:
         }
         return newp;
     }
-    void clearAssertInfo() { m_senip = nullptr; }
+    void clearAssertInfo() {
+        m_senip = nullptr;
+        m_disablep = nullptr;
+    }
 
     // VISITORS
     //========== Statements
@@ -98,7 +103,7 @@ private:
         AstNode* past = new AstPast(fl, exprp, nullptr);
         past->dtypeFrom(exprp);
         exprp = new AstAnd(fl, past, new AstNot(fl, exprp->cloneTree(false)));
-        exprp->dtypeSetLogicBool();
+        exprp->dtypeSetBit();
         nodep->replaceWith(exprp);
         nodep->sentreep(newSenTree(nodep));
         VL_DO_DANGLING(pushDeletep(nodep), nodep);
@@ -117,7 +122,7 @@ private:
         AstNode* past = new AstPast(fl, exprp, nullptr);
         past->dtypeFrom(exprp);
         exprp = new AstAnd(fl, new AstNot(fl, past), exprp->cloneTree(false));
-        exprp->dtypeSetLogicBool();
+        exprp->dtypeSetBit();
         nodep->replaceWith(exprp);
         nodep->sentreep(newSenTree(nodep));
         VL_DO_DANGLING(pushDeletep(nodep), nodep);
@@ -129,9 +134,26 @@ private:
         AstNode* exprp = nodep->exprp()->unlinkFrBack();
         AstNode* past = new AstPast(fl, exprp, nullptr);
         past->dtypeFrom(exprp);
-        exprp = new AstEq(fl, past,
-                          exprp->cloneTree(false));  // new AstVarRef(fl, exprp, true)
-        exprp->dtypeSetLogicBool();
+        exprp = new AstEq(fl, past, exprp->cloneTree(false));
+        exprp->dtypeSetBit();
+        nodep->replaceWith(exprp);
+        nodep->sentreep(newSenTree(nodep));
+        VL_DO_DANGLING(pushDeletep(nodep), nodep);
+    }
+
+    virtual void visit(AstImplication* nodep) override {
+        if (nodep->sentreep()) return;  // Already processed
+
+        FileLine* fl = nodep->fileline();
+        AstNode* rhsp = nodep->rhsp()->unlinkFrBack();
+        AstNode* lhsp = nodep->lhsp()->unlinkFrBack();
+
+        if (m_disablep) { lhsp = new AstAnd(fl, new AstNot(fl, m_disablep), lhsp); }
+
+        AstNode* past = new AstPast(fl, lhsp, nullptr);
+        past->dtypeFrom(lhsp);
+        AstNode* exprp = new AstOr(fl, new AstNot(fl, past), rhsp);
+        exprp->dtypeSetBit();
         nodep->replaceWith(exprp);
         nodep->sentreep(newSenTree(nodep));
         VL_DO_DANGLING(pushDeletep(nodep), nodep);
@@ -145,6 +167,7 @@ private:
         // Block is the new expression to evaluate
         AstNode* blockp = nodep->propp()->unlinkFrBack();
         if (nodep->disablep()) {
+            m_disablep = nodep->disablep()->cloneTree(false);
             if (VN_IS(nodep->backp(), Cover)) {
                 blockp = new AstAnd(
                     nodep->disablep()->fileline(),
@@ -174,7 +197,7 @@ public:
         // Process
         iterate(nodep);
     }
-    virtual ~AssertPreVisitor() override {}
+    virtual ~AssertPreVisitor() override = default;
 };
 
 //######################################################################

src/V3AssertPre.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3AssertPre {
+class V3AssertPre final {
 public:
     static void assertPreAll(AstNetlist* nodep);
 };

src/V3Ast.cpp

@@ -58,9 +58,10 @@ std::ostream& operator<<(std::ostream& os, AstType rhs);
 //######################################################################
 // Creators
 
-void AstNode::init() {
+AstNode::AstNode(AstType t, FileLine* fl)
+    : m_type{t}
+    , m_fileline{fl} {
     editCountInc();
-    m_fileline = nullptr;
     m_nextp = nullptr;
     m_backp = nullptr;
     m_headtailp = this;  // When made, we're a list of only a single element
@@ -126,8 +127,9 @@ string AstNode::encodeName(const string& namein) {
     }
     // Shorten names
     // TODO long term use VName in place of "string name"
-    VName vname(out);
-    out = vname.hashedName();
+    // Then we also won't need to save the table of hased values
+    VName vname{out};
+    return vname.hashedName();
     return out;
 }
 
@@ -160,7 +162,8 @@ string AstNode::dedotName(const string& namein) {
 string AstNode::vcdName(const string& namein) {
     // VCD tracing expects space to separate hierarchy
     // Dots are reserved for dots the user put in the name
-    string pretty = namein;
+    // We earlier hashed all symbols, dehash them so user sees real name
+    string pretty{VName::dehash(namein)};
     string::size_type pos;
     while ((pos = pretty.find("__DOT__")) != string::npos) pretty.replace(pos, 7, " ");
     while ((pos = pretty.find('.')) != string::npos) pretty.replace(pos, 1, " ");
@@ -393,6 +396,7 @@ void AstNode::setOp4p(AstNode* newp) {
 
 void AstNode::addOp1p(AstNode* newp) {
     UASSERT(newp, "Null item passed to addOp1p");
+    UDEBUGONLY(UASSERT_OBJ(!newp->m_backp, newp, "Adding already linked node"););
     if (!m_op1p) {
         op1p(newp);
     } else {
@@ -402,6 +406,7 @@ void AstNode::addOp1p(AstNode* newp) {
 
 void AstNode::addOp2p(AstNode* newp) {
     UASSERT(newp, "Null item passed to addOp2p");
+    UDEBUGONLY(UASSERT_OBJ(!newp->m_backp, newp, "Adding already linked node"););
     if (!m_op2p) {
         op2p(newp);
     } else {
@@ -411,6 +416,7 @@ void AstNode::addOp2p(AstNode* newp) {
 
 void AstNode::addOp3p(AstNode* newp) {
     UASSERT(newp, "Null item passed to addOp3p");
+    UDEBUGONLY(UASSERT_OBJ(!newp->m_backp, newp, "Adding already linked node"););
     if (!m_op3p) {
         op3p(newp);
     } else {
@@ -420,6 +426,7 @@ void AstNode::addOp3p(AstNode* newp) {
 
 void AstNode::addOp4p(AstNode* newp) {
     UASSERT(newp, "Null item passed to addOp4p");
+    UDEBUGONLY(UASSERT_OBJ(!newp->m_backp, newp, "Adding already linked node"););
     if (!m_op4p) {
         op4p(newp);
     } else {
@@ -1022,28 +1029,40 @@ void AstNode::checkTree() {
 }
 
 // cppcheck-suppress unusedFunction  // Debug only
-void AstNode::dumpGdb() {  // For GDB only  // LCOV_EXCL_LINE
-    dumpGdbHeader();  // LCOV_EXCL_LINE
+void AstNode::dumpGdb(const AstNode* nodep) {  // For GDB only  // LCOV_EXCL_LINE
+    if (!nodep) {
+        cout << "<nullptr>" << endl;
+        return;
+    }
+    nodep->dumpGdbHeader();
     cout << "  ";
-    dump(cout);
-    cout << endl;  // LCOV_EXCL_LINE
-}
+    nodep->dump(cout);
+    cout << endl;
+}  // LCOV_EXCL_STOP
 // cppcheck-suppress unusedFunction  // Debug only
-void AstNode::dumpGdbHeader() const {  // For GDB only  // LCOV_EXCL_LINE
-    dumpPtrs(cout);  // LCOV_EXCL_LINE
-    cout << "  Fileline = " << fileline() << endl;  // LCOV_EXCL_LINE
-}
+void AstNode::dumpGdbHeader() const {  // For GDB only  // LCOV_EXCL_START
+    dumpPtrs(cout);
+    cout << "  Fileline = " << fileline() << endl;
+}  // LCOV_EXCL_STOP
 // cppcheck-suppress unusedFunction  // Debug only
-void AstNode::dumpTreeGdb() {  // For GDB only  // LCOV_EXCL_LINE
-    dumpGdbHeader();  // LCOV_EXCL_LINE
-    dumpTree(cout);  // LCOV_EXCL_LINE
-}
+void AstNode::dumpTreeGdb(const AstNode* nodep) {  // For GDB only  // LCOV_EXCL_START
+    if (!nodep) {
+        cout << "<nullptr>" << endl;
+        return;
+    }
+    nodep->dumpGdbHeader();
+    nodep->dumpTree(cout);
+}  // LCOV_EXCL_STOP
 // cppcheck-suppress unusedFunction  // Debug only
-void AstNode::dumpTreeFileGdb(const char* filenamep) {  // For GDB only  // LCOV_EXCL_LINE
-    string filename
-        = filenamep ? filenamep : v3Global.debugFilename("debug.tree", 98);  // LCOV_EXCL_LINE
-    v3Global.rootp()->dumpTreeFile(filename);  // LCOV_EXCL_LINE
-}
+void AstNode::dumpTreeFileGdb(const AstNode* nodep,  // LCOV_EXCL_START
+                              const char* filenamep) {  // For GDB only
+    if (!nodep) {
+        cout << "<nullptr>" << endl;
+        return;
+    }
+    string filename = filenamep ? filenamep : v3Global.debugFilename("debug.tree", 98);
+    v3Global.rootp()->dumpTreeFile(filename);
+}  // LCOV_EXCL_STOP
 
 // cppcheck-suppress unusedFunction  // Debug only
 void AstNode::checkIter() const {
@@ -1081,14 +1100,14 @@ void AstNode::dumpPtrs(std::ostream& os) const {
 
 void AstNode::dumpTree(std::ostream& os, const string& indent, int maxDepth) const {
     static int s_debugFileline = v3Global.opt.debugSrcLevel("fileline");  // --debugi-fileline 9
-    os << indent << " " << this << endl;
+    os << indent << " " << this << '\n';
     if (debug() > 8) {
         os << indent << "     ";
         dumpPtrs(os);
     }
     if (s_debugFileline >= 9) { os << fileline()->warnContextSecondary(); }
     if (maxDepth == 1) {
-        if (op1p() || op2p() || op3p() || op4p()) { os << indent << "1: ...(maxDepth)" << endl; }
+        if (op1p() || op2p() || op3p() || op4p()) os << indent << "1: ...(maxDepth)\n";
     } else {
         for (const AstNode* nodep = op1p(); nodep; nodep = nodep->nextp()) {
             nodep->dumpTree(os, indent + "1:", maxDepth - 1);
@@ -1112,7 +1131,7 @@ void AstNode::dumpTreeAndNext(std::ostream& os, const string& indent, int maxDep
     }
 }
 
-void AstNode::dumpTreeFile(const string& filename, bool append, bool doDump) {
+void AstNode::dumpTreeFile(const string& filename, bool append, bool doDump, bool doCheck) {
     // Not const function as calls checkTree
     if (doDump) {
         {  // Write log & close
@@ -1120,9 +1139,9 @@ void AstNode::dumpTreeFile(const string& filename, bool append, bool doDump) {
             const std::unique_ptr<std::ofstream> logsp(V3File::new_ofstream(filename, append));
             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() << ">" << endl;
+            *logsp << "> to <e" << std::dec << editCountGbl() << ">\n";
             if (editCountGbl() == editCountLast() && !(v3Global.opt.dumpTree() >= 9)) {
-                *logsp << endl;
+                *logsp << '\n';
                 *logsp << "No changes since last dump!\n";
             } else {
                 dumpTree(*logsp);
@@ -1130,7 +1149,7 @@ void AstNode::dumpTreeFile(const string& filename, bool append, bool doDump) {
             }
         }
     }
-    if (v3Global.opt.debugCheck() || v3Global.opt.dumpTree()) {
+    if (doCheck && (v3Global.opt.debugCheck() || v3Global.opt.dumpTree())) {
         // Error check
         checkTree();
         // Broken isn't part of check tree because it can munge iterp's
@@ -1192,7 +1211,7 @@ void AstNode::v3errorEnd(std::ostringstream& str) const {
         std::ostringstream nsstr;
         nsstr << str.str();
         if (debug()) {
-            nsstr << endl;
+            nsstr << '\n';
             nsstr << "-node: ";
             const_cast<AstNode*>(this)->dump(nsstr);
             nsstr << endl;
@@ -1260,6 +1279,9 @@ AstBasicDType* AstNode::findInsertSameDType(AstBasicDType* nodep) {
 AstNodeDType* AstNode::findVoidDType() const {
     return v3Global.rootp()->typeTablep()->findVoidDType(fileline());
 }
+AstNodeDType* AstNode::findQueueIndexDType() const {
+    return v3Global.rootp()->typeTablep()->findQueueIndexDType(fileline());
+}
 
 //######################################################################
 // AstNVisitor

src/V3AstNodes.cpp

@@ -54,7 +54,7 @@ void AstNodeVarRef::cloneRelink() {
 }
 
 string AstNodeVarRef::hiernameProtect() const {
-    return VIdProtect::protectWordsIf(hiername(), protect());
+    return hiernameToUnprot() + VIdProtect::protectWordsIf(hiernameToProt(), protect());
 }
 
 int AstNodeSel::bitConst() const {
@@ -87,8 +87,10 @@ const char* AstNodeUOrStructDType::broken() const {
     return nullptr;
 }
 
+void AstNodeStmt::dump(std::ostream& str) const { this->AstNode::dump(str); }
+
 void AstNodeCCall::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeStmt::dump(str);
     if (funcp()) {
         str << " " << funcp()->name() << " => ";
         funcp()->dump(str);
@@ -105,7 +107,7 @@ const char* AstNodeCCall::broken() const {
 }
 bool AstNodeCCall::isPure() const { return funcp()->pure(); }
 string AstNodeCCall::hiernameProtect() const {
-    return VIdProtect::protectWordsIf(hiername(), protect());
+    return hiernameToUnprot() + VIdProtect::protectWordsIf(hiernameToProt(), protect());
 }
 
 void AstNodeCond::numberOperate(V3Number& out, const V3Number& lhs, const V3Number& rhs,
@@ -310,107 +312,22 @@ string AstVar::verilogKwd() const {
     }
 }
 
-class AstVar::VlArgTypeRecursed {
-public:
-    bool m_isRef;  // Is it a reference?
-    string m_type;  // The base type, e.g.: "Foo_t"s
-    string m_dims;  // Array dimensions, e.g.: "[3][2][1]"
-    string render(const string& name) const {
-        string out;
-        out += m_type;
-        out += " ";
-        out += m_isRef ? "(&" + name + ")" : name;
-        out += m_dims;
-        return out;
-    }
-};
-
 string AstVar::vlArgType(bool named, bool forReturn, bool forFunc, const string& namespc) const {
     UASSERT_OBJ(!forReturn, this,
                 "Internal data is never passed as return, but as first argument");
     string ostatic;
     if (isStatic() && namespc.empty()) ostatic = "static ";
 
-    VlArgTypeRecursed info = vlArgTypeRecurse(forFunc, dtypep());
+    bool isRef = isDpiOpenArray() || (forFunc && (isWritable() || direction().isRefOrConstRef()));
+
+    if (forFunc && isReadOnly() && isRef) ostatic = ostatic + "const ";
 
     string oname;
     if (named) {
         if (!namespc.empty()) oname += namespc + "::";
         oname += VIdProtect::protectIf(name(), protect());
     }
-    return ostatic + info.render(oname);
-}
-
-AstVar::VlArgTypeRecursed AstVar::vlArgTypeRecurse(bool forFunc, const AstNodeDType* dtypep,
-                                                   bool compound) const {
-    VlArgTypeRecursed info;
-    info.m_isRef
-        = isDpiOpenArray() || (forFunc && (isWritable() || direction().isRefOrConstRef()));
-
-    dtypep = dtypep->skipRefp();
-    if (const AstAssocArrayDType* adtypep = VN_CAST_CONST(dtypep, AssocArrayDType)) {
-        const VlArgTypeRecursed key = vlArgTypeRecurse(false, adtypep->keyDTypep(), true);
-        const VlArgTypeRecursed val = vlArgTypeRecurse(false, adtypep->subDTypep(), true);
-        info.m_type = "VlAssocArray<" + key.m_type + ", " + val.m_type + ">";
-    } else if (const AstDynArrayDType* adtypep = VN_CAST_CONST(dtypep, DynArrayDType)) {
-        const VlArgTypeRecursed sub = vlArgTypeRecurse(false, adtypep->subDTypep(), true);
-        info.m_type = "VlQueue<" + sub.m_type + ">";
-    } else if (const AstQueueDType* adtypep = VN_CAST_CONST(dtypep, QueueDType)) {
-        const VlArgTypeRecursed sub = vlArgTypeRecurse(false, adtypep->subDTypep(), true);
-        info.m_type = "VlQueue<" + sub.m_type;
-        // + 1 below as VlQueue uses 0 to mean unlimited, 1 to mean size() max is 1
-        if (adtypep->boundp()) info.m_type += ", " + cvtToStr(adtypep->boundConst() + 1);
-        info.m_type += ">";
-    } else if (const AstClassRefDType* adtypep = VN_CAST_CONST(dtypep, ClassRefDType)) {
-        info.m_type = "VlClassRef<" + EmitCBaseVisitor::prefixNameProtect(adtypep) + ">";
-    } else if (const AstUnpackArrayDType* adtypep = VN_CAST_CONST(dtypep, UnpackArrayDType)) {
-        if (compound) {
-            v3fatalSrc("Dynamic arrays or queues with unpacked elements are not yet supported");
-        }
-        const VlArgTypeRecursed sub = vlArgTypeRecurse(false, adtypep->subDTypep(), compound);
-        info.m_type = sub.m_type;
-        info.m_dims = "[" + cvtToStr(adtypep->declRange().elements()) + "]" + sub.m_dims;
-    } else if (const AstBasicDType* 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
-        const string bitvec = (!bdtypep->isOpaque() && !v3Global.opt.protectIds())
-                                  ? "/*" + cvtToStr(dtypep->width() - 1) + ":0*/"
-                                  : "";
-        if (bdtypep->keyword() == AstBasicDTypeKwd::CHARPTR) {
-            info.m_type = "const char*";
-        } else if (bdtypep->keyword() == AstBasicDTypeKwd::SCOPEPTR) {
-            info.m_type = "const VerilatedScope*";
-        } else if (bdtypep->keyword() == AstBasicDTypeKwd::DOUBLE) {
-            info.m_type = "double";
-        } else if (bdtypep->keyword() == AstBasicDTypeKwd::FLOAT) {
-            info.m_type = "float";
-        } else if (bdtypep->keyword() == AstBasicDTypeKwd::STRING) {
-            info.m_type = "std::string";
-        } else if (dtypep->widthMin() <= 8) {  // Handle unpacked arrays; not bdtypep->width
-            info.m_type = "CData" + bitvec;
-        } else if (dtypep->widthMin() <= 16) {
-            info.m_type = "SData" + bitvec;
-        } else if (dtypep->widthMin() <= VL_IDATASIZE) {
-            info.m_type = "IData" + bitvec;
-        } else if (dtypep->isQuad()) {
-            info.m_type = "QData" + bitvec;
-        } else if (dtypep->isWide()) {
-            if (compound) {
-                info.m_type = "VlWide<" + cvtToStr(dtypep->widthWords()) + "> ";
-            } else {
-                info.m_type += "WData" + bitvec;  // []'s added later
-                info.m_dims = "[" + cvtToStr(dtypep->widthWords()) + "]";
-            }
-        }
-    } else {
-        v3fatalSrc("Unknown data type in var type emitter: " << dtypep->prettyName());
-    }
-
-    UASSERT_OBJ(!compound || info.m_dims.empty(), this, "Declaring C array inside compound type");
-
-    if (forFunc && isReadOnly() && info.m_isRef) { info.m_type = "const " + info.m_type; }
-
-    return info;
+    return ostatic + dtypep()->cType(oname, forFunc, isRef);
 }
 
 string AstVar::vlEnumType() const {
@@ -538,38 +455,99 @@ string AstVar::cPubArgType(bool named, bool forReturn) const {
     return arg;
 }
 
-string AstVar::dpiArgType(bool named, bool forReturn) const {
-    if (forReturn) named = false;
-    string arg;
-    if (isDpiOpenArray()) {
-        arg = "const svOpenArrayHandle";
-    } else if (!basicp()) {
-        arg = "UNKNOWN";
-    } else if (basicp()->isDpiBitVec()) {
-        if (forReturn) {
-            arg = "svBitVecVal";
-        } else if (isReadOnly()) {
-            arg = "const svBitVecVal*";
-        } else {
-            arg = "svBitVecVal*";
-        }
-    } else if (basicp()->isDpiLogicVec()) {
-        if (forReturn) {
-            arg = "svLogicVecVal";
-        } else if (isReadOnly()) {
-            arg = "const svLogicVecVal*";
-        } else {
-            arg = "svLogicVecVal*";
-        }
-    } else {
-        arg = basicp()->keyword().dpiType();
-        if (basicp()->keyword().isDpiUnsignable() && !basicp()->isSigned()) {
-            arg = "unsigned " + arg;
-        }
-        if (!forReturn && isWritable()) arg += "*";
+class dpiTypesToStringConverter VL_NOT_FINAL {
+public:
+    virtual string openArray(const AstVar*) const { return "const svOpenArrayHandle"; }
+    virtual string bitLogicVector(const AstVar* varp, bool isBit) const {
+        return isBit ? "svBitVecVal" : "svLogicVecVal";
     }
-    if (named) arg += " " + name();
-    return arg;
+    virtual string primitive(const AstVar* varp) const {
+        string type;
+        if (varp->basicp()->keyword().isDpiUnsignable() && !varp->basicp()->isSigned()) {
+            type = "unsigned ";
+        }
+        type += varp->basicp()->keyword().dpiType();
+        return type;
+    }
+    string convert(const AstVar* varp) const {
+        if (varp->isDpiOpenArray()) {
+            return openArray(varp);
+        } else if (!varp->basicp()) {
+            return "UNKNOWN";
+        } else if (varp->basicp()->isDpiBitVec() || varp->basicp()->isDpiLogicVec()) {
+            return bitLogicVector(varp, varp->basicp()->isDpiBitVec());
+        } else {
+            return primitive(varp);
+        }
+    }
+};
+
+string AstVar::dpiArgType(bool named, bool forReturn) const {
+    if (forReturn) {
+        return dpiTypesToStringConverter{}.convert(this);
+    } else {
+        class converter final : public dpiTypesToStringConverter {
+            virtual string bitLogicVector(const AstVar* varp, bool isBit) const override {
+                return string(varp->isReadOnly() ? "const " : "")
+                       + dpiTypesToStringConverter::bitLogicVector(varp, isBit) + '*';
+            }
+            virtual string primitive(const AstVar* varp) const override {
+                string type = dpiTypesToStringConverter::primitive(varp);
+                if (varp->isWritable() || VN_IS(varp->dtypep()->skipRefp(), UnpackArrayDType)) {
+                    if (!varp->isWritable()
+                        && varp->basicp()->keyword() != AstBasicDTypeKwd::STRING)
+                        type = "const " + type;
+                    type += "*";
+                }
+                return type;
+            }
+        };
+        string arg = converter{}.convert(this);
+        if (named) arg += " " + name();
+        return arg;
+    }
+}
+
+string AstVar::dpiTmpVarType(const string& varName) const {
+    class converter final : public dpiTypesToStringConverter {
+        string m_name;
+        string arraySuffix(const AstVar* varp, size_t n) const {
+            if (AstUnpackArrayDType* unpackp
+                = VN_CAST(varp->dtypep()->skipRefp(), UnpackArrayDType)) {
+                // Convert multi dimensional unpacked array to 1D array
+                if (n == 0) n = 1;
+                n *= unpackp->arrayUnpackedElements();
+                return '[' + cvtToStr(n) + ']';
+            } else if (n > 0) {
+                return '[' + cvtToStr(n) + ']';
+            } else {
+                return "";
+            }
+        }
+        virtual string openArray(const AstVar* varp) const override {
+            return dpiTypesToStringConverter::openArray(varp) + ' ' + m_name
+                   + arraySuffix(varp, 0);
+        }
+        virtual string bitLogicVector(const AstVar* varp, bool isBit) const override {
+            string type = dpiTypesToStringConverter::bitLogicVector(varp, isBit);
+            type += ' ' + m_name + arraySuffix(varp, varp->widthWords());
+            return type;
+        }
+        virtual string primitive(const AstVar* varp) const override {
+            string type = dpiTypesToStringConverter::primitive(varp);
+            if (varp->isWritable() || VN_IS(varp->dtypep()->skipRefp(), UnpackArrayDType)) {
+                if (!varp->isWritable() && varp->basicp()->keyword() == AstBasicDTypeKwd::CHANDLE)
+                    type = "const " + type;
+            }
+            type += ' ' + m_name + arraySuffix(varp, 0);
+            return type;
+        }
+
+    public:
+        explicit converter(const string& name)
+            : m_name(name) {}
+    };
+    return converter{varName}.convert(this);
 }
 
 string AstVar::scType() const {
@@ -636,6 +614,90 @@ string AstVar::mtasksString() const {
     return os.str();
 }
 
+class AstNodeDType::CTypeRecursed final {
+public:
+    string m_type;  // The base type, e.g.: "Foo_t"s
+    string m_dims;  // Array dimensions, e.g.: "[3][2][1]"
+    string render(const string& name, bool isRef) const {
+        string out;
+        out += m_type;
+        if (name != "") out += " ";
+        out += isRef ? "(&" + name + ")" : name;
+        out += m_dims;
+        return out;
+    }
+};
+
+string AstNodeDType::cType(const string& name, bool forFunc, bool isRef) const {
+    CTypeRecursed info = cTypeRecurse(false);
+    return info.render(name, isRef);
+}
+
+AstNodeDType::CTypeRecursed AstNodeDType::cTypeRecurse(bool compound) const {
+    CTypeRecursed info;
+
+    const AstNodeDType* dtypep = this->skipRefp();
+    if (const auto* adtypep = VN_CAST_CONST(dtypep, AssocArrayDType)) {
+        const CTypeRecursed key = adtypep->keyDTypep()->cTypeRecurse(true);
+        const CTypeRecursed val = adtypep->subDTypep()->cTypeRecurse(true);
+        info.m_type = "VlAssocArray<" + key.m_type + ", " + val.m_type + ">";
+    } else if (const auto* adtypep = VN_CAST_CONST(dtypep, DynArrayDType)) {
+        const CTypeRecursed sub = adtypep->subDTypep()->cTypeRecurse(true);
+        info.m_type = "VlQueue<" + sub.m_type + ">";
+    } else if (const auto* adtypep = VN_CAST_CONST(dtypep, QueueDType)) {
+        const CTypeRecursed sub = adtypep->subDTypep()->cTypeRecurse(true);
+        info.m_type = "VlQueue<" + sub.m_type;
+        // + 1 below as VlQueue uses 0 to mean unlimited, 1 to mean size() max is 1
+        if (adtypep->boundp()) info.m_type += ", " + cvtToStr(adtypep->boundConst() + 1);
+        info.m_type += ">";
+    } else if (const auto* adtypep = VN_CAST_CONST(dtypep, ClassRefDType)) {
+        info.m_type = "VlClassRef<" + EmitCBaseVisitor::prefixNameProtect(adtypep) + ">";
+    } else if (const auto* adtypep = VN_CAST_CONST(dtypep, UnpackArrayDType)) {
+        if (compound) {
+            v3fatalSrc("Dynamic arrays or queues with unpacked elements are not yet supported");
+        }
+        const CTypeRecursed sub = adtypep->subDTypep()->cTypeRecurse(compound);
+        info.m_type = sub.m_type;
+        info.m_dims = "[" + cvtToStr(adtypep->declRange().elements()) + "]" + sub.m_dims;
+    } else if (const AstBasicDType* 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
+        const string bitvec = (!bdtypep->isOpaque() && !v3Global.opt.protectIds())
+                                  ? "/*" + cvtToStr(dtypep->width() - 1) + ":0*/"
+                                  : "";
+        if (bdtypep->keyword() == AstBasicDTypeKwd::CHARPTR) {
+            info.m_type = "const char*";
+        } else if (bdtypep->keyword() == AstBasicDTypeKwd::SCOPEPTR) {
+            info.m_type = "const VerilatedScope*";
+        } else if (bdtypep->keyword() == AstBasicDTypeKwd::DOUBLE) {
+            info.m_type = "double";
+        } else if (bdtypep->keyword() == AstBasicDTypeKwd::STRING) {
+            info.m_type = "std::string";
+        } else if (dtypep->widthMin() <= 8) {  // Handle unpacked arrays; not bdtypep->width
+            info.m_type = "CData" + bitvec;
+        } else if (dtypep->widthMin() <= 16) {
+            info.m_type = "SData" + bitvec;
+        } else if (dtypep->widthMin() <= VL_IDATASIZE) {
+            info.m_type = "IData" + bitvec;
+        } else if (dtypep->isQuad()) {
+            info.m_type = "QData" + bitvec;
+        } else if (dtypep->isWide()) {
+            if (compound) {
+                info.m_type = "VlWide<" + cvtToStr(dtypep->widthWords()) + "> ";
+            } else {
+                info.m_type += "WData" + bitvec;  // []'s added later
+                info.m_dims = "[" + cvtToStr(dtypep->widthWords()) + "]";
+            }
+        }
+    } else {
+        v3fatalSrc("Unknown data type in var type emitter: " << dtypep->prettyName());
+    }
+
+    UASSERT_OBJ(!compound || info.m_dims.empty(), this, "Declaring C array inside compound type");
+
+    return info;
+}
+
 AstNodeDType* AstNodeDType::dtypeDimensionp(int dimension) {
     // dimension passed from AstArraySel::dimension
     // Dimension 0 means the VAR itself, 1 is the closest SEL to the AstVar,
@@ -843,9 +905,7 @@ bool AstSenTree::hasCombo() const {
 void AstTypeTable::clearCache() {
     // When we mass-change widthMin in V3WidthCommit, we need to correct the table.
     // Just clear out the maps; the search functions will be used to rebuild the map
-    for (int i = 0; i < static_cast<int>(AstBasicDTypeKwd::_ENUM_MAX); ++i) {
-        m_basicps[i] = nullptr;
-    }
+    for (auto& itr : m_basicps) itr = nullptr;
     m_detailedMap.clear();
     // Clear generic()'s so dead detection will work
     for (AstNode* nodep = typesp(); nodep; nodep = nodep->nextp()) {
@@ -872,6 +932,15 @@ AstVoidDType* AstTypeTable::findVoidDType(FileLine* fl) {
     return m_voidp;
 }
 
+AstQueueDType* AstTypeTable::findQueueIndexDType(FileLine* fl) {
+    if (VL_UNLIKELY(!m_queueIndexp)) {
+        AstQueueDType* newp = new AstQueueDType(fl, AstNode::findUInt32DType(), nullptr);
+        addTypesp(newp);
+        m_queueIndexp = newp;
+    }
+    return m_queueIndexp;
+}
+
 AstBasicDType* AstTypeTable::findBasicDType(FileLine* fl, AstBasicDTypeKwd kwd) {
     if (m_basicps[kwd]) return m_basicps[kwd];
     //
@@ -1035,8 +1104,10 @@ void AstNode::dump(std::ostream& str) const {
     }
 }
 
+void AstNodeProcedure::dump(std::ostream& str) const { this->AstNode::dump(str); }
+
 void AstAlways::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeProcedure::dump(str);
     if (keyword() != VAlwaysKwd::ALWAYS) str << " [" << keyword().ascii() << "]";
 }
 
@@ -1057,8 +1128,12 @@ string AstBasicDType::prettyDTypeName() const {
     }
     return os.str();
 }
+
+void AstNodeMath::dump(std::ostream& str) const { this->AstNode::dump(str); }
+void AstNodeUniop::dump(std::ostream& str) const { this->AstNodeMath::dump(str); }
+
 void AstCCast::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeUniop::dump(str);
     str << " sz" << size();
 }
 void AstCell::dump(std::ostream& str) const {
@@ -1074,6 +1149,7 @@ void AstCell::dump(std::ostream& str) const {
 void AstCellInline::dump(std::ostream& str) const {
     this->AstNode::dump(str);
     str << " -> " << origModName();
+    str << " [scopep=" << reinterpret_cast<const void*>(scopep()) << "]";
 }
 const char* AstClassPackage::broken() const {
     BROKEN_BASE_RTN(AstNodeModule::broken());
@@ -1095,6 +1171,13 @@ void AstClass::repairCache() {
     clearCache();
     for (AstNode* itemp = membersp(); itemp; itemp = itemp->nextp()) { insertCache(itemp); }
 }
+bool AstClass::isClassExtendedFrom(const AstClass* refClassp, const AstClass* baseClassp) {
+    // TAIL RECURSIVE
+    if (!refClassp || !baseClassp) return false;
+    if (refClassp == baseClassp) return true;
+    if (!refClassp->extendsp()) return false;
+    return isClassExtendedFrom(refClassp->extendsp()->classp(), baseClassp);
+}
 void AstClass::dump(std::ostream& str) const {
     this->AstNode::dump(str);
     if (isExtended()) str << " [EXT]";
@@ -1102,6 +1185,9 @@ void AstClass::dump(std::ostream& str) const {
 }
 AstClass* AstClassExtends::classp() const {
     AstClassRefDType* refp = VN_CAST(dtypep(), ClassRefDType);
+    if (VL_UNLIKELY(!refp)) {  // LinkDot uses this for 'super.'
+        refp = VN_CAST(childDTypep(), ClassRefDType);
+    }
     UASSERT_OBJ(refp, this, "class extends non-ref");
     return refp->classp();
 }
@@ -1119,15 +1205,15 @@ void AstClassRefDType::dumpSmall(std::ostream& str) const {
     str << "class:" << name();
 }
 void AstNodeCoverOrAssert::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeStmt::dump(str);
     if (immediate()) str << " [IMMEDIATE]";
 }
 void AstDisplay::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeStmt::dump(str);
     // str<<" "<<displayType().ascii();
 }
 void AstEnumItemRef::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeMath::dump(str);
     str << " -> ";
     if (itemp()) {
         itemp()->dump(str);
@@ -1158,16 +1244,16 @@ void AstInitArray::dump(std::ostream& str) const {
     this->AstNode::dump(str);
     int n = 0;
     const AstInitArray::KeyItemMap& mapr = map();
-    for (AstInitArray::KeyItemMap::const_iterator it = mapr.begin(); it != mapr.end(); ++it) {
+    for (const auto& itr : mapr) {
         if (n++ > 5) {
             str << " ...";
             break;
         }
-        str << " [" << it->first << "]=" << (void*)it->second;
+        str << " [" << itr.first << "]=" << reinterpret_cast<const void*>(itr.second);
     }
 }
 void AstJumpGo::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeStmt::dump(str);
     str << " -> ";
     if (labelp()) {
         labelp()->dump(str);
@@ -1176,7 +1262,7 @@ void AstJumpGo::dump(std::ostream& str) const {
     }
 }
 void AstJumpLabel::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeStmt::dump(str);
     str << " -> ";
     if (blockp()) {
         blockp()->dump(str);
@@ -1185,7 +1271,7 @@ void AstJumpLabel::dump(std::ostream& str) const {
     }
 }
 void AstMemberSel::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeMath::dump(str);
     str << " -> ";
     if (varp()) {
         varp()->dump(str);
@@ -1194,7 +1280,7 @@ void AstMemberSel::dump(std::ostream& str) const {
     }
 }
 void AstMethodCall::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeStmt::dump(str);
     if (isStatement()) str << " [STMT]";
     str << " -> ";
     if (taskp()) {
@@ -1235,27 +1321,30 @@ void AstPin::dump(std::ostream& str) const {
     if (svImplicit()) str << " [.SV]";
 }
 void AstPrintTimeScale::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeStmt::dump(str);
     str << " " << timeunit();
 }
+
+void AstNodeTermop::dump(std::ostream& str) const { this->AstNodeMath::dump(str); }
 void AstTime::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeTermop::dump(str);
     str << " " << timeunit();
 }
 void AstTimeD::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeTermop::dump(str);
     str << " " << timeunit();
 }
 void AstTimeImport::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeUniop::dump(str);
     str << " " << timeunit();
 }
 void AstTypedef::dump(std::ostream& str) const {
     this->AstNode::dump(str);
     if (attrPublic()) str << " [PUBLIC]";
 }
+void AstNodeRange::dump(std::ostream& str) const { this->AstNode::dump(str); }
 void AstRange::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeRange::dump(str);
     if (littleEndian()) str << " [LITTLE]";
 }
 void AstRefDType::dump(std::ostream& str) const {
@@ -1327,6 +1416,18 @@ string AstUnpackArrayDType::prettyDTypeName() const {
     os << subp->prettyDTypeName() << "$" << ranges;
     return os.str();
 }
+std::vector<AstUnpackArrayDType*> AstUnpackArrayDType::unpackDimensions() {
+    std::vector<AstUnpackArrayDType*> dims;
+    for (AstUnpackArrayDType* unpackp = this; unpackp;) {
+        dims.push_back(unpackp);
+        if (AstNodeDType* subp = unpackp->subDTypep()) {
+            unpackp = VN_CAST(subp, UnpackArrayDType);
+        } else {
+            unpackp = nullptr;
+        }
+    }
+    return dims;
+}
 void AstNetlist::dump(std::ostream& str) const {
     this->AstNode::dump(str);
     str << " [" << timeunit() << "/" << timeprecision() << "]";
@@ -1352,15 +1453,20 @@ void AstPackageImport::dump(std::ostream& str) const {
     this->AstNode::dump(str);
     str << " -> " << packagep();
 }
-void AstSel::dump(std::ostream& str) const {
+void AstPatMember::dump(std::ostream& str) const {
     this->AstNode::dump(str);
+    if (isDefault()) str << " [DEFAULT]";
+}
+void AstNodeTriop::dump(std::ostream& str) const { this->AstNodeMath::dump(str); }
+void AstSel::dump(std::ostream& str) const {
+    this->AstNodeTriop::dump(str);
     if (declRange().ranged()) {
         str << " decl" << declRange() << "]";
         if (declElWidth() != 1) str << "/" << declElWidth();
     }
 }
 void AstSliceSel::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeTriop::dump(str);
     if (declRange().ranged()) str << " decl" << declRange();
 }
 void AstMTaskBody::dump(std::ostream& str) const {
@@ -1372,7 +1478,7 @@ void AstTypeTable::dump(std::ostream& str) const {
     this->AstNode::dump(str);
     for (int i = 0; i < static_cast<int>(AstBasicDTypeKwd::_ENUM_MAX); ++i) {
         if (AstBasicDType* subnodep = m_basicps[i]) {
-            str << endl;  // Newline from caller, so newline first
+            str << '\n';  // Newline from caller, so newline first
             str << "\t\t" << std::setw(8) << AstBasicDTypeKwd(i).ascii();
             str << "  -> ";
             subnodep->dump(str);
@@ -1380,9 +1486,9 @@ void AstTypeTable::dump(std::ostream& str) const {
     }
     {
         const DetailedMap& mapr = m_detailedMap;
-        for (DetailedMap::const_iterator it = mapr.begin(); it != mapr.end(); ++it) {
-            AstBasicDType* dtypep = it->second;
-            str << endl;  // Newline from caller, so newline first
+        for (const auto& itr : mapr) {
+            AstBasicDType* dtypep = itr.second;
+            str << '\n';  // Newline from caller, so newline first
             str << "\t\tdetailed  ->  ";
             dtypep->dump(str);
         }
@@ -1391,7 +1497,7 @@ void AstTypeTable::dump(std::ostream& str) const {
 }
 void AstAssocArrayDType::dumpSmall(std::ostream& str) const {
     this->AstNodeDType::dumpSmall(str);
-    str << "[assoc-" << (void*)keyDTypep() << "]";
+    str << "[assoc-" << reinterpret_cast<const void*>(keyDTypep()) << "]";
 }
 string AstAssocArrayDType::prettyDTypeName() const {
     return subDTypep()->prettyDTypeName() + "[" + keyDTypep()->prettyDTypeName() + "]";
@@ -1428,14 +1534,13 @@ void AstVarScope::dump(std::ostream& str) const {
         str << " ->UNLINKED";
     }
 }
+void AstNodeVarRef::dump(std::ostream& str) const {
+    this->AstNodeMath::dump(str);
+    if (classOrPackagep()) str << " pkg=" << nodeAddr(classOrPackagep());
+    str << " " << access().arrow() << " ";
+}
 void AstVarXRef::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
-    if (packagep()) { str << " pkg=" << nodeAddr(packagep()); }
-    if (lvalue()) {
-        str << " [LV] => ";
-    } else {
-        str << " [RV] <- ";
-    }
+    this->AstNodeVarRef::dump(str);
     str << ".=" << dotted() << " ";
     if (inlinedDots() != "") str << " inline.=" << inlinedDots() << " - ";
     if (varScopep()) {
@@ -1447,13 +1552,7 @@ void AstVarXRef::dump(std::ostream& str) const {
     }
 }
 void AstVarRef::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
-    if (packagep()) { str << " pkg=" << nodeAddr(packagep()); }
-    if (lvalue()) {
-        str << " [LV] => ";
-    } else {
-        str << " [RV] <- ";
-    }
+    this->AstNodeVarRef::dump(str);
     if (varScopep()) {
         varScopep()->dump(str);
     } else if (varp()) {
@@ -1486,6 +1585,12 @@ void AstVar::dump(std::ostream& str) const {
     if (!lifetime().isNone()) str << " [" << lifetime().ascii() << "] ";
     str << " " << 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()) << "]";
+}
 void AstSenTree::dump(std::ostream& str) const {
     this->AstNode::dump(str);
     if (isMulti()) str << " [MULTI]";
@@ -1522,8 +1627,8 @@ void AstActive::dump(std::ostream& str) const {
     }
 }
 void AstNodeFTaskRef::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
-    if (packagep()) { str << " pkg=" << nodeAddr(packagep()); }
+    this->AstNodeStmt::dump(str);
+    if (classOrPackagep()) str << " pkg=" << nodeAddr(classOrPackagep());
     str << " -> ";
     if (dotted() != "") { str << ".=" << dotted() << " "; }
     if (taskp()) {
@@ -1554,7 +1659,7 @@ void AstBegin::dump(std::ostream& str) const {
     if (implied()) str << " [IMPLIED]";
 }
 void AstCoverDecl::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeStmt::dump(str);
     if (!page().empty()) str << " page=" << page();
     if (!linescov().empty()) str << " lc=" << linescov();
     if (this->dataDeclNullp()) {
@@ -1565,7 +1670,7 @@ void AstCoverDecl::dump(std::ostream& str) const {
     }
 }
 void AstCoverInc::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeStmt::dump(str);
     str << " -> ";
     if (declp()) {
         declp()->dump(str);
@@ -1578,7 +1683,7 @@ void AstFork::dump(std::ostream& str) const {
     if (!joinType().join()) str << " [" << joinType() << "]";
 }
 void AstTraceInc::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeStmt::dump(str);
     str << " -> ";
     if (declp()) {
         declp()->dump(str);
@@ -1597,10 +1702,11 @@ void AstNodeText::dump(std::ostream& str) const {
     str << " \"" << out << "\"";
 }
 
-void AstVFile::dump(std::ostream& str) const { this->AstNode::dump(str); }
+void AstNodeFile::dump(std::ostream& str) const { this->AstNode::dump(str); }
+void AstVFile::dump(std::ostream& str) const { this->AstNodeFile::dump(str); }
 
 void AstCFile::dump(std::ostream& str) const {
-    this->AstNode::dump(str);
+    this->AstNodeFile::dump(str);
     if (source()) str << " [SRC]";
     if (slow()) str << " [SLOW]";
 }

src/V3Begin.cpp

@@ -36,7 +36,7 @@
 
 //######################################################################
 
-class BeginState {
+class BeginState final {
 private:
     // NODE STATE
     // Entire netlist:
@@ -45,8 +45,8 @@ private:
     bool m_anyFuncInBegin = false;
 
 public:
-    BeginState() {}
-    ~BeginState() {}
+    BeginState() = default;
+    ~BeginState() = default;
     void userMarkChanged(AstNode* nodep) {
         nodep->user1(true);
         m_anyFuncInBegin = true;
@@ -56,7 +56,7 @@ public:
 
 //######################################################################
 
-class BeginVisitor : public AstNVisitor {
+class BeginVisitor final : public AstNVisitor {
 private:
     // STATE
     BeginState* m_statep;  // Current global state
@@ -69,6 +69,11 @@ private:
     // METHODS
     VL_DEBUG_FUNC;  // Declare debug()
 
+    string dot(const string& a, const string& b) {
+        if (a == "") return b;
+        return a + "__DOT__" + b;
+    }
+
     // VISITORS
     virtual void visit(AstNodeModule* nodep) override {
         VL_RESTORER(m_modp);
@@ -81,7 +86,7 @@ private:
         UINFO(8, "  " << nodep << endl);
         // Rename it
         if (m_unnamedScope != "") {
-            nodep->name(m_unnamedScope + "__DOT__" + nodep->name());
+            nodep->name(dot(m_unnamedScope, nodep->name()));
             UINFO(8, "     rename to " << nodep->name() << endl);
             m_statep->userMarkChanged(nodep);
         }
@@ -103,8 +108,8 @@ private:
     virtual void visit(AstBegin* nodep) override {
         // Begin blocks were only useful in variable creation, change names and delete
         UINFO(8, "  " << nodep << endl);
-        string oldScope = m_namedScope;
-        string oldUnnamed = m_unnamedScope;
+        VL_RESTORER(m_namedScope);
+        VL_RESTORER(m_unnamedScope);
         {
             UINFO(8, "nname " << m_namedScope << endl);
             if (nodep->name() != "") {  // Else unneeded unnamed block
@@ -114,18 +119,8 @@ private:
                 while ((pos = dottedname.find("__DOT__")) != string::npos) {
                     string ident = dottedname.substr(0, pos);
                     dottedname = dottedname.substr(pos + strlen("__DOT__"));
-                    if (nodep->name() != "") {
-                        if (m_namedScope == "") {
-                            m_namedScope = ident;
-                        } else {
-                            m_namedScope = m_namedScope + "__DOT__" + ident;
-                        }
-                    }
-                    if (m_unnamedScope == "") {
-                        m_unnamedScope = ident;
-                    } else {
-                        m_unnamedScope = m_unnamedScope + "__DOT__" + ident;
-                    }
+                    if (nodep->name() != "") m_namedScope = dot(m_namedScope, ident);
+                    m_unnamedScope = dot(m_unnamedScope, ident);
                     // Create CellInline for dotted var resolution
                     if (!m_ftaskp) {
                         AstCellInline* inlinep = new AstCellInline(
@@ -138,31 +133,29 @@ private:
             // Remap var names and replace lower Begins
             iterateAndNextNull(nodep->stmtsp());
             UASSERT_OBJ(!nodep->genforp(), nodep, "GENFORs should have been expanded earlier");
-        }
-        m_namedScope = oldScope;
-        m_unnamedScope = oldUnnamed;
 
-        // Cleanup
-        AstNode* addsp = nullptr;
-        if (AstNode* stmtsp = nodep->stmtsp()) {
-            stmtsp->unlinkFrBackWithNext();
-            if (addsp) {
-                addsp = addsp->addNextNull(stmtsp);
-            } else {
-                addsp = stmtsp;
+            // Cleanup
+            AstNode* addsp = nullptr;
+            if (AstNode* stmtsp = nodep->stmtsp()) {
+                stmtsp->unlinkFrBackWithNext();
+                if (addsp) {
+                    addsp = addsp->addNextNull(stmtsp);
+                } else {
+                    addsp = stmtsp;
+                }
             }
+            if (addsp) {
+                nodep->replaceWith(addsp);
+            } else {
+                nodep->unlinkFrBack();
+            }
+            VL_DO_DANGLING(pushDeletep(nodep), nodep);
         }
-        if (addsp) {
-            nodep->replaceWith(addsp);
-        } else {
-            nodep->unlinkFrBack();
-        }
-        VL_DO_DANGLING(pushDeletep(nodep), nodep);
     }
     virtual void visit(AstVar* nodep) override {
         if (m_unnamedScope != "") {
             // Rename it
-            nodep->name(m_unnamedScope + "__DOT__" + nodep->name());
+            nodep->name(dot(m_unnamedScope, nodep->name()));
             m_statep->userMarkChanged(nodep);
             // Move to module
             nodep->unlinkFrBack();
@@ -176,7 +169,7 @@ private:
     virtual void visit(AstTypedef* nodep) override {
         if (m_unnamedScope != "") {
             // Rename it
-            nodep->name(m_unnamedScope + "__DOT__" + nodep->name());
+            nodep->name(dot(m_unnamedScope, nodep->name()));
             m_statep->userMarkChanged(nodep);
             // Move to module
             nodep->unlinkFrBack();
@@ -193,7 +186,7 @@ private:
         if (m_namedScope != "") {
             m_statep->userMarkChanged(nodep);
             // Rename it
-            nodep->name(m_namedScope + "__DOT__" + nodep->name());
+            nodep->name(dot(m_namedScope, nodep->name()));
             UINFO(8, "     rename to " << nodep->name() << endl);
             // Move to module
             nodep->unlinkFrBack();
@@ -203,7 +196,7 @@ private:
     }
     virtual void visit(AstVarXRef* nodep) override {
         UINFO(9, "   VARXREF " << nodep << endl);
-        if (m_namedScope != "" && nodep->inlinedDots() == "") {
+        if (m_namedScope != "" && nodep->inlinedDots() == "" && !m_ftaskp) {
             nodep->inlinedDots(m_namedScope);
             UINFO(9, "    rescope to " << nodep << endl);
         }
@@ -249,12 +242,12 @@ public:
         : m_statep{statep} {
         iterate(nodep);
     }
-    virtual ~BeginVisitor() override {}
+    virtual ~BeginVisitor() override = default;
 };
 
 //######################################################################
 
-class BeginRelinkVisitor : public AstNVisitor {
+class BeginRelinkVisitor final : public AstNVisitor {
     // Replace tasks with new pointer
 private:
     // NODE STATE
@@ -290,7 +283,7 @@ private:
 public:
     // CONSTRUCTORS
     BeginRelinkVisitor(AstNetlist* nodep, BeginState*) { iterate(nodep); }
-    virtual ~BeginRelinkVisitor() override {}
+    virtual ~BeginRelinkVisitor() override = default;
 };
 
 //######################################################################

src/V3Begin.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Begin {
+class V3Begin final {
 public:
     static void debeginAll(AstNetlist* nodep);
 };

src/V3Branch.cpp

@@ -35,7 +35,7 @@
 //######################################################################
 // Branch state, as a visitor of each AstNode
 
-class BranchVisitor : public AstNVisitor {
+class BranchVisitor final : public AstNVisitor {
 private:
     // NODE STATE
     // Entire netlist:
@@ -118,7 +118,7 @@ public:
         iterateChildren(nodep);
         calc_tasks();
     }
-    virtual ~BranchVisitor() override {}
+    virtual ~BranchVisitor() override = default;
 };
 
 //######################################################################

src/V3Branch.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Branch {
+class V3Branch final {
 public:
     // CONSTRUCTORS
     static void branchAll(AstNetlist* nodep);

src/V3Broken.cpp

@@ -36,7 +36,7 @@
 
 //######################################################################
 
-class BrokenTable : public AstNVisitor {
+class BrokenTable VL_NOT_FINAL : public AstNVisitor {
     // Table of brokenExists node pointers
 private:
     // MEMBERS
@@ -190,8 +190,8 @@ public:
     }
 
     // CONSTRUCTORS
-    BrokenTable() {}
-    virtual ~BrokenTable() override {}
+    BrokenTable() = default;
+    virtual ~BrokenTable() override = default;
 };
 
 BrokenTable::NodeMap BrokenTable::s_nodes;
@@ -211,7 +211,7 @@ bool AstNode::brokeExistsBelow() const {
 
 //######################################################################
 
-class BrokenMarkVisitor : public AstNVisitor {
+class BrokenMarkVisitor final : public AstNVisitor {
     // Mark every node in the tree
 private:
     // NODE STATE
@@ -231,13 +231,15 @@ private:
 public:
     // CONSTRUCTORS
     explicit BrokenMarkVisitor(AstNetlist* nodep) { iterate(nodep); }
-    virtual ~BrokenMarkVisitor() override {}
+    virtual ~BrokenMarkVisitor() override = default;
 };
 
 //######################################################################
 // Broken state, as a visitor of each AstNode
 
-class BrokenCheckVisitor : public AstNVisitor {
+class BrokenCheckVisitor final : public AstNVisitor {
+    bool m_inScope = false;  // Under AstScope
+
 private:
     static void checkWidthMin(const AstNode* nodep) {
         UASSERT_OBJ(nodep->width() == nodep->widthMin()
@@ -275,9 +277,25 @@ private:
         processAndIterate(nodep);
         UASSERT_OBJ(!(v3Global.assertDTypesResolved() && nodep->brokeLhsMustBeLvalue()
                       && VN_IS(nodep->lhsp(), NodeVarRef)
-                      && !VN_CAST(nodep->lhsp(), NodeVarRef)->lvalue()),
+                      && !VN_CAST(nodep->lhsp(), NodeVarRef)->access().isWriteOrRW()),
                     nodep, "Assignment LHS is not an lvalue");
     }
+    virtual void visit(AstScope* nodep) override {
+        VL_RESTORER(m_inScope);
+        {
+            m_inScope = true;
+            processAndIterate(nodep);
+        }
+    }
+    virtual void visit(AstNodeVarRef* nodep) override {
+        processAndIterate(nodep);
+        // m_inScope because some Vars have initial variable references without scopes
+        // This might false fire with some debug flags, as not certain we don't have temporary
+        // clear varScopep's during some an infrequent dump just before we re-LinkDot.
+        UASSERT_OBJ(
+            !(v3Global.assertScoped() && m_inScope && nodep->varp() && !nodep->varScopep()), nodep,
+            "VarRef missing VarScope pointer");
+    }
     virtual void visit(AstNode* nodep) override {
         // Process not just iterate
         processAndIterate(nodep);
@@ -286,7 +304,7 @@ private:
 public:
     // CONSTRUCTORS
     explicit BrokenCheckVisitor(AstNetlist* nodep) { iterate(nodep); }
-    virtual ~BrokenCheckVisitor() override {}
+    virtual ~BrokenCheckVisitor() override = default;
 };
 
 //######################################################################

src/V3Broken.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Broken {
+class V3Broken final {
 public:
     static void brokenAll(AstNetlist* nodep);
     static void addNewed(AstNode* nodep);

src/V3CCtors.cpp

@@ -34,7 +34,7 @@
 #include <algorithm>
 #include <map>
 
-class V3CCtorsVisitor {
+class V3CCtorsVisitor final {
 private:
     string m_basename;
     string m_argsp;
@@ -42,8 +42,8 @@ private:
     AstNodeModule* m_modp;  // Current module
     AstCFunc* m_tlFuncp;  // Top level function being built
     AstCFunc* m_funcp;  // Current function
-    int m_numStmts;  // Number of statements output
-    int m_funcNum;  // Function number being built
+    int m_numStmts = 0;  // Number of statements output
+    int m_funcNum = 0;  // Function number being built
 
 public:
     void add(AstNode* nodep) {
@@ -76,8 +76,6 @@ public:
         m_argsp = argsp;
         m_callargsp = callargsp;
         m_modp = nodep;
-        m_numStmts = 0;
-        m_funcNum = 0;
         m_tlFuncp = new AstCFunc(nodep->fileline(), basename, nullptr, "void");
         m_tlFuncp->declPrivate(true);
         m_tlFuncp->isStatic(false);
@@ -87,7 +85,7 @@ public:
         m_funcp = m_tlFuncp;
         m_modp->addStmtp(m_tlFuncp);
     }
-    ~V3CCtorsVisitor() {}
+    ~V3CCtorsVisitor() = default;
 
 private:
     VL_UNCOPYABLE(V3CCtorsVisitor);
@@ -111,7 +109,7 @@ void V3CCtors::evalAsserts() {
                     int lastWordWidth = varp->width() % storedWidth;
                     if (lastWordWidth != 0) {
                         // if (signal & CONST(upper_non_clean_mask)) { fail; }
-                        AstNode* newp = new AstVarRef(varp->fileline(), varp, false);
+                        AstNode* newp = new AstVarRef(varp->fileline(), varp, VAccess::READ);
                         if (varp->isWide()) {
                             newp = new AstWordSel(
                                 varp->fileline(), newp,
@@ -151,8 +149,9 @@ void V3CCtors::cctorsAll() {
             for (AstNode* np = modp->stmtsp(); np; np = np->nextp()) {
                 if (AstVar* varp = VN_CAST(np, Var)) {
                     if (!varp->isIfaceParent() && !varp->isIfaceRef() && !varp->noReset()) {
-                        var_reset.add(new AstCReset(varp->fileline(),
-                                                    new AstVarRef(varp->fileline(), varp, true)));
+                        var_reset.add(
+                            new AstCReset(varp->fileline(),
+                                          new AstVarRef(varp->fileline(), varp, VAccess::WRITE)));
                     }
                 }
             }

src/V3CCtors.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3CCtors {
+class V3CCtors final {
 public:
     static void cctorsAll();
 

src/V3CUse.cpp

@@ -36,12 +36,12 @@
 
 //######################################################################
 
-class CUseState {
+class CUseState final {
 private:
     // MEMBERS
     AstNodeModule* m_modInsertp;  // Current module to insert AstCUse under
     typedef std::pair<VUseType, string> UseString;
-    std::map<UseString, AstCUse*> m_didUse;  // What we already used
+    std::map<const UseString, AstCUse*> m_didUse;  // What we already used
 
     // NODE STATE
     // Entire netlist:
@@ -68,14 +68,14 @@ public:
     // CONSTRUCTORS
     explicit CUseState(AstNodeModule* nodep)
         : m_modInsertp{nodep} {}
-    virtual ~CUseState() {}
+    virtual ~CUseState() = default;
     VL_UNCOPYABLE(CUseState);
 };
 
 // Visit within a module all nodes and data types they reference, finding
 // any classes so we can make sure they are defined when Verilated code
 // compiles
-class CUseDTypeVisitor : public AstNVisitor {
+class CUseDTypeVisitor final : public AstNVisitor {
     // MEMBERS
     CUseState& m_stater;  // State for inserter
     bool m_impOnly = false;  // In details needed only for implementation
@@ -84,7 +84,7 @@ class CUseDTypeVisitor : public AstNVisitor {
         if (nodep->user2SetOnce()) return;  // Process once
         if (!m_impOnly) m_stater.newUse(nodep, VUseType::INT_FWD_CLASS, nodep->classp()->name());
         // No class.h, it's inside the class package's h file
-        m_stater.newUse(nodep, VUseType::IMP_INCLUDE, nodep->classp()->packagep()->name());
+        m_stater.newUse(nodep, VUseType::IMP_INCLUDE, nodep->classp()->classOrPackagep()->name());
         // Need to include extends() when we implement, but no need for pointers to know
         VL_RESTORER(m_impOnly);
         {
@@ -109,11 +109,11 @@ public:
         : m_stater(stater) {  // Need () or GCC 4.8 false warning
         iterate(nodep);
     }
-    virtual ~CUseDTypeVisitor() override {}
+    virtual ~CUseDTypeVisitor() override = default;
     VL_UNCOPYABLE(CUseDTypeVisitor);
 };
 
-class CUseVisitor : public AstNVisitor {
+class CUseVisitor final : public AstNVisitor {
     // MEMBERS
     CUseState m_state;  // Inserter state
 
@@ -148,7 +148,7 @@ class CUseVisitor : public AstNVisitor {
         funcp->isStatic(false);
         funcp->protect(false);
         AstNode* exprp = new AstCMath(nodep->fileline(),
-                                      "std::string(\"`{\") + to_string_middle() + \"}\"", 0);
+                                      R"(std::string("'{") + to_string_middle() + "}")", 0);
         exprp->dtypeSetString();
         funcp->addStmtsp(new AstCReturn(nodep->fileline(), exprp));
         nodep->addStmtp(funcp);
@@ -162,16 +162,25 @@ class CUseVisitor : public AstNVisitor {
         funcp->addStmtsp(new AstCStmt(nodep->fileline(), "std::string out;\n"));
         std::string comma;
         for (AstNode* itemp = nodep->membersp(); itemp; itemp = itemp->nextp()) {
-            if (VN_IS(itemp, Var)) {
-                string stmt = "out += \"";
-                stmt += comma;
-                comma = ", ";
-                stmt += itemp->origNameProtect();
-                stmt += ":\" + VL_TO_STRING(";
-                stmt += itemp->nameProtect();
-                stmt += ");\n";
-                nodep->user1(true);  // So what we extend dumps this
-                funcp->addStmtsp(new AstCStmt(nodep->fileline(), stmt));
+            if (auto* varp = VN_CAST(itemp, Var)) {
+                if (!varp->isParam()) {
+                    string stmt = "out += \"";
+                    stmt += comma;
+                    comma = ", ";
+                    stmt += itemp->origNameProtect();
+                    stmt += ":\" + ";
+                    if (itemp->isWide()) {
+                        stmt += "VL_TO_STRING_W(";
+                        stmt += cvtToStr(itemp->widthWords());
+                        stmt += ", ";
+                    } else {
+                        stmt += "VL_TO_STRING(";
+                    }
+                    stmt += itemp->nameProtect();
+                    stmt += ");\n";
+                    nodep->user1(true);  // So what we extend dumps this
+                    funcp->addStmtsp(new AstCStmt(nodep->fileline(), stmt));
+                }
             }
         }
         if (nodep->extendsp() && nodep->extendsp()->classp()->user1()) {
@@ -210,7 +219,7 @@ public:
         : m_state{nodep} {
         iterate(nodep);
     }
-    virtual ~CUseVisitor() override {}
+    virtual ~CUseVisitor() override = default;
     VL_UNCOPYABLE(CUseVisitor);
 };
 

src/V3CUse.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3CUse {
+class V3CUse final {
 public:
     static void cUseAll();
 };

src/V3Case.cpp

@@ -50,7 +50,7 @@
 
 //######################################################################
 
-class CaseLintVisitor : public AstNVisitor {
+class CaseLintVisitor final : public AstNVisitor {
 private:
     AstNodeCase* m_caseExprp
         = nullptr;  // Under a CASE value node, if so the relevant case statement
@@ -111,13 +111,13 @@ private:
 public:
     // CONSTRUCTORS
     explicit CaseLintVisitor(AstNodeCase* nodep) { iterate(nodep); }
-    virtual ~CaseLintVisitor() override {}
+    virtual ~CaseLintVisitor() override = default;
 };
 
 //######################################################################
 // Case state, as a visitor of each AstNode
 
-class CaseVisitor : public AstNVisitor {
+class CaseVisitor final : public AstNVisitor {
 private:
     // NODE STATE
     // Cleared each Case
@@ -133,7 +133,7 @@ private:
     int m_caseItems = 0;  // Number of caseItem unique values
     bool m_caseNoOverlapsAllCovered = false;  // Proven to be synopsys parallel_case compliant
     // For each possible value, the case branch we need
-    AstNode* m_valueItem[1 << CASE_OVERLAP_WIDTH];
+    std::array<AstNode*, 1 << CASE_OVERLAP_WIDTH> m_valueItem;
 
     // METHODS
     VL_DEBUG_FUNC;  // Declare debug()
@@ -318,7 +318,7 @@ private:
              itemp = VN_CAST(itemp->nextp(), CaseItem)) {
             if (!itemp->condsp()) {
                 // Default clause.  Just make true, we'll optimize it away later
-                itemp->condsp(new AstConst(itemp->fileline(), AstConst::LogicTrue()));
+                itemp->condsp(new AstConst(itemp->fileline(), AstConst::BitTrue()));
                 hadDefault = true;
             } else {
                 // Expressioned clause
@@ -336,7 +336,7 @@ private:
                         VL_DANGLING(iconstp);
                         // For simplicity, make expression that is not equal, and let later
                         // optimizations remove it
-                        condp = new AstConst(itemp->fileline(), AstConst::LogicFalse());
+                        condp = new AstConst(itemp->fileline(), AstConst::BitFalse());
                     } else if (AstInsideRange* irangep = VN_CAST(icondp, InsideRange)) {
                         // Similar logic in V3Width::visit(AstInside)
                         condp = irangep->newAndFromInside(cexprp, irangep->lhsp()->unlinkFrBack(),
@@ -375,9 +375,8 @@ private:
         if (!hadDefault) {
             // If there was no default, add a empty one, this greatly simplifies below code
             // and constant propagation will just eliminate it for us later.
-            nodep->addItemsp(
-                new AstCaseItem(nodep->fileline(),
-                                new AstConst(nodep->fileline(), AstConst::LogicTrue()), nullptr));
+            nodep->addItemsp(new AstCaseItem(
+                nodep->fileline(), new AstConst(nodep->fileline(), AstConst::BitTrue()), nullptr));
         }
         if (debug() >= 9) nodep->dumpTree(cout, "    _comp_COND: ");
         // Now build the IF statement tree
@@ -419,7 +418,7 @@ private:
                 VL_DANGLING(ifexprp);
                 if (depth == CASE_ENCODER_GROUP_DEPTH) {  // End of group - can skip the condition
                     VL_DO_DANGLING(itemexprp->deleteTree(), itemexprp);
-                    itemexprp = new AstConst(itemp->fileline(), AstConst::LogicTrue());
+                    itemexprp = new AstConst(itemp->fileline(), AstConst::BitTrue());
                 }
                 AstIf* newp = new AstIf(itemp->fileline(), itemexprp, istmtsp, nullptr);
                 if (itemnextp) {
@@ -486,7 +485,7 @@ private:
 public:
     // CONSTRUCTORS
     explicit CaseVisitor(AstNetlist* nodep) {
-        for (uint32_t i = 0; i < (1UL << CASE_OVERLAP_WIDTH); ++i) m_valueItem[i] = nullptr;
+        for (auto& itr : m_valueItem) itr = nullptr;
         iterate(nodep);
     }
     virtual ~CaseVisitor() override {

src/V3Case.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Case {
+class V3Case final {
 public:
     static void caseAll(AstNetlist* nodep);
     static void caseLint(AstNodeCase* nodep);

src/V3Cast.cpp

@@ -49,7 +49,7 @@
 //######################################################################
 // Cast state, as a visitor of each AstNode
 
-class CastVisitor : public AstNVisitor {
+class CastVisitor final : public AstNVisitor {
 private:
     // NODE STATE
     // Entire netlist:
@@ -73,7 +73,7 @@ private:
         ensureLower32Cast(castp);
         nodep->user1(1);  // Now must be of known size
     }
-    int castSize(AstNode* nodep) {
+    static int castSize(AstNode* nodep) {
         if (nodep->isQuad()) {
             return VL_QUADSIZE;
         } else if (nodep->width() <= 8) {
@@ -154,9 +154,9 @@ private:
         }
     }
     virtual void visit(AstVarRef* nodep) override {
-        if (!nodep->lvalue() && !VN_IS(nodep->backp(), CCast) && VN_IS(nodep->backp(), NodeMath)
-            && !VN_IS(nodep->backp(), ArraySel) && nodep->backp()->width()
-            && castSize(nodep) != castSize(nodep->varp())) {
+        if (nodep->access().isReadOnly() && !VN_IS(nodep->backp(), CCast)
+            && VN_IS(nodep->backp(), NodeMath) && !VN_IS(nodep->backp(), ArraySel)
+            && nodep->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);
             insertCast(nodep, castSize(nodep));
@@ -193,7 +193,7 @@ private:
 public:
     // CONSTRUCTORS
     explicit CastVisitor(AstNetlist* nodep) { iterate(nodep); }
-    virtual ~CastVisitor() override {}
+    virtual ~CastVisitor() override = default;
 };
 
 //######################################################################

src/V3Cast.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Cast {
+class V3Cast final {
 public:
     static void castAll(AstNetlist* nodep);
 };

src/V3Cdc.cpp

@@ -41,7 +41,7 @@ constexpr int CDC_WEIGHT_ASYNC = 0x1000;  // Weight for edges that feed async lo
 
 //######################################################################
 
-class CdcBaseVisitor : public AstNVisitor {
+class CdcBaseVisitor VL_NOT_FINAL : public AstNVisitor {
 public:
     VL_DEBUG_FUNC;  // Declare debug()
 };
@@ -49,7 +49,7 @@ public:
 //######################################################################
 // Graph support classes
 
-class CdcEitherVertex : public V3GraphVertex {
+class CdcEitherVertex VL_NOT_FINAL : public V3GraphVertex {
     AstScope* m_scopep;
     AstNode* m_nodep;
     AstSenTree* m_srcDomainp = nullptr;
@@ -66,7 +66,7 @@ public:
         , m_srcDomainSet{false}
         , m_dstDomainSet{false}
         , m_asyncPath{false} {}
-    virtual ~CdcEitherVertex() override {}
+    virtual ~CdcEitherVertex() override = default;
     // ACCESSORS
     virtual FileLine* fileline() const override { return nodep()->fileline(); }
     AstScope* scopep() const { return m_scopep; }
@@ -83,7 +83,7 @@ public:
     void asyncPath(bool flag) { m_asyncPath = flag; }
 };
 
-class CdcVarVertex : public CdcEitherVertex {
+class CdcVarVertex final : public CdcEitherVertex {
     AstVarScope* m_varScp;
     int m_cntAsyncRst = 0;
     bool m_fromFlop = false;
@@ -92,7 +92,7 @@ public:
     CdcVarVertex(V3Graph* graphp, AstScope* scopep, AstVarScope* varScp)
         : CdcEitherVertex{graphp, scopep, varScp}
         , m_varScp{varScp} {}
-    virtual ~CdcVarVertex() override {}
+    virtual ~CdcVarVertex() override = default;
     // ACCESSORS
     AstVarScope* varScp() const { return m_varScp; }
     virtual string name() const override { return (cvtToHex(m_varScp) + " " + varScp()->name()); }
@@ -105,7 +105,7 @@ public:
     void fromFlop(bool flag) { m_fromFlop = flag; }
 };
 
-class CdcLogicVertex : public CdcEitherVertex {
+class CdcLogicVertex final : public CdcEitherVertex {
     bool m_hazard : 1;
     bool m_isFlop : 1;
 
@@ -117,7 +117,7 @@ public:
         srcDomainp(sensenodep);
         dstDomainp(sensenodep);
     }
-    virtual ~CdcLogicVertex() override {}
+    virtual ~CdcLogicVertex() override = default;
     // ACCESSORS
     virtual string name() const override {
         return (cvtToHex(nodep()) + "@" + scopep()->prettyName());
@@ -135,7 +135,7 @@ public:
 
 //######################################################################
 
-class CdcDumpVisitor : public CdcBaseVisitor {
+class CdcDumpVisitor final : public CdcBaseVisitor {
 private:
     // NODE STATE
     // Entire netlist:
@@ -150,7 +150,7 @@ private:
         } else {
             *m_ofp << "  ";
         }
-        *m_ofp << nodep->prettyTypeName() << " " << endl;
+        *m_ofp << nodep->prettyTypeName() << "\n";
         string lastPrefix = m_prefix;
         m_prefix = lastPrefix + "1:";
         iterateAndNextNull(nodep->op1p());
@@ -170,12 +170,12 @@ public:
         , m_prefix{prefix} {
         iterate(nodep);
     }
-    virtual ~CdcDumpVisitor() override {}
+    virtual ~CdcDumpVisitor() override = default;
 };
 
 //######################################################################
 
-class CdcWidthVisitor : public CdcBaseVisitor {
+class CdcWidthVisitor final : public CdcBaseVisitor {
 private:
     int m_maxLineno = 0;
     size_t m_maxFilenameLen = 0;
@@ -194,7 +194,7 @@ private:
 public:
     // CONSTRUCTORS
     explicit CdcWidthVisitor(AstNode* nodep) { iterate(nodep); }
-    virtual ~CdcWidthVisitor() override {}
+    virtual ~CdcWidthVisitor() override = default;
     // ACCESSORS
     int maxWidth() const {
         size_t width = 1;
@@ -209,7 +209,7 @@ public:
 //######################################################################
 // Cdc class functions
 
-class CdcVisitor : public CdcBaseVisitor {
+class CdcVisitor final : public CdcBaseVisitor {
 private:
     // NODE STATE
     // Entire netlist:
@@ -292,7 +292,7 @@ private:
             told_file = true;
             std::cerr << V3Error::msgPrefix() << "     See details in " << m_ofFilename << endl;
         }
-        *m_ofp << "%Warning-" << code.ascii() << ": " << nodep->fileline() << " " << msg << endl;
+        *m_ofp << "%Warning-" << code.ascii() << ": " << nodep->fileline() << " " << msg << '\n';
     }
 
     void setNodeHazard(AstNode* nodep) {
@@ -311,13 +311,12 @@ private:
         }
     }
 
-    string spaces(int level) {
+    static string spaces(int level) {
         string out;
         while (level--) out += " ";
         return out;
     }  // LCOV_EXCL_LINE
-
-    string pad(unsigned column, const string& in) {
+    static string pad(unsigned column, const string& in) {
         string out = in;
         while (out.length() < column) out += ' ';
         return out;
@@ -463,7 +462,7 @@ private:
         string front
             = pad(filelineWidth(), nodep->fileline()->ascii() + ":") + " " + prefix + " +- ";
         if (VN_IS(nodep, VarScope)) {
-            *m_ofp << front << "Variable: " << nodep->prettyName() << endl;
+            *m_ofp << front << "Variable: " << nodep->prettyName() << '\n';
         } else {
             V3EmitV::verilogPrefixedTree(nodep, *m_ofp, prefix + " +- ", filelineWidth(),
                                          vertexp->srcDomainp(), true);
@@ -510,7 +509,7 @@ private:
         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() << endl;
+        *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()) {
@@ -537,7 +536,7 @@ private:
                         V3EmitV::verilogForTree(vvertexp->dstDomainp(), os);
                     }
                     os << std::setw(0);
-                    os << endl;
+                    os << '\n';
                     report.push_back(os.str());
                 }
             }
@@ -588,15 +587,15 @@ private:
         // Convert list of senses into one sense node
         AstSenTree* senoutp = nullptr;
         bool senedited = false;
-        for (SenSet::iterator it = senouts.begin(); it != senouts.end(); ++it) {
+        for (const auto& itr : senouts) {
             if (!senoutp) {
-                senoutp = *it;
+                senoutp = itr;
             } else {
                 if (!senedited) {
                     senedited = true;
                     senoutp = senoutp->cloneTree(true);
                 }
-                senoutp->addSensesp((*it)->sensesp()->cloneTree(true));
+                senoutp->addSensesp(itr->sensesp()->cloneTree(true));
             }
         }
         // If multiple domains need to do complicated optimizations
@@ -661,7 +660,7 @@ private:
             // 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->lvalue()) {
+            if (nodep->access().isWriteOrRW()) {
                 new V3GraphEdge(&m_graph, m_logicVertexp, varvertexp, 1);
                 if (m_inDly) {
                     varvertexp->fromFlop(true);
@@ -733,7 +732,7 @@ public:
         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() << endl;
+        *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";
@@ -746,7 +745,7 @@ public:
         if (false) {
             *m_ofp << "\nDBG-test-dumper\n";
             V3EmitV::verilogPrefixedTree(nodep, *m_ofp, "DBG ", 40, nullptr, true);
-            *m_ofp << endl;
+            *m_ofp << '\n';
         }
     }
     virtual ~CdcVisitor() override {

src/V3Cdc.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Cdc {
+class V3Cdc final {
 public:
     static void cdcAll(AstNetlist* nodep);
 };

src/V3Changed.cpp

@@ -38,7 +38,7 @@
 
 //######################################################################
 
-class ChangedState {
+class ChangedState final {
 public:
     // STATE
     AstNodeModule* m_topModp = nullptr;  // Top module
@@ -48,8 +48,8 @@ public:
     int m_numStmts = 0;  // Number of statements added to m_chgFuncp
     int m_funcNum = 0;  // Number of change functions emitted
 
-    ChangedState() {}
-    ~ChangedState() {}
+    ChangedState() = default;
+    ~ChangedState() = default;
 
     void maybeCreateChgFuncp() {
         // Don't create an extra function call if splitting is disabled
@@ -94,7 +94,7 @@ public:
 //######################################################################
 // Utility visitor to find elements to be compared
 
-class ChangedInsertVisitor : public AstNVisitor {
+class ChangedInsertVisitor final : public AstNVisitor {
 private:
     // STATE
     ChangedState* m_statep;  // Shared state across visitors
@@ -117,10 +117,9 @@ private:
                            "Unsupported: Can't detect more than "
                                << cvtToStr(DETECTARRAY_MAX_INDEXES)
                                << " array indexes (probably with UNOPTFLAT warning suppressed): "
-                               << m_vscp->prettyName() << endl
+                               << m_vscp->prettyName() << '\n'
                                << m_vscp->warnMore()
-                               << "... Could recompile with DETECTARRAY_MAX_INDEXES increased"
-                               << endl);
+                               << "... Could recompile with DETECTARRAY_MAX_INDEXES increased");
             return;
         }
         m_statep->maybeCreateChgFuncp();
@@ -199,23 +198,23 @@ public:
             m_newvscp = new AstVarScope(m_vscp->fileline(), m_statep->m_scopetopp, newvarp);
             m_statep->m_scopetopp->addVarp(m_newvscp);
 
-            m_varEqnp = new AstVarRef(m_vscp->fileline(), m_vscp, false);
-            m_newLvEqnp = new AstVarRef(m_vscp->fileline(), m_newvscp, true);
-            m_newRvEqnp = new AstVarRef(m_vscp->fileline(), m_newvscp, false);
+            m_varEqnp = new AstVarRef(m_vscp->fileline(), m_vscp, VAccess::READ);
+            m_newLvEqnp = new AstVarRef(m_vscp->fileline(), m_newvscp, VAccess::WRITE);
+            m_newRvEqnp = new AstVarRef(m_vscp->fileline(), m_newvscp, VAccess::READ);
         }
         iterate(vscp->dtypep()->skipRefp());
         m_varEqnp->deleteTree();
         m_newLvEqnp->deleteTree();
         m_newRvEqnp->deleteTree();
     }
-    virtual ~ChangedInsertVisitor() override {}
+    virtual ~ChangedInsertVisitor() override = default;
     VL_UNCOPYABLE(ChangedInsertVisitor);
 };
 
 //######################################################################
 // Changed state, as a visitor of each AstNode
 
-class ChangedVisitor : public AstNVisitor {
+class ChangedVisitor final : public AstNVisitor {
 private:
     // NODE STATE
     // Entire netlist:
@@ -280,7 +279,7 @@ public:
         : m_statep{statep} {
         iterate(nodep);
     }
-    virtual ~ChangedVisitor() override {}
+    virtual ~ChangedVisitor() override = default;
 };
 
 //######################################################################

src/V3Changed.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Changed {
+class V3Changed final {
 public:
     static void changedAll(AstNetlist* nodep);
 };

src/V3Class.cpp

@@ -29,12 +29,14 @@
 
 //######################################################################
 
-class ClassVisitor : public AstNVisitor {
+class ClassVisitor final : public AstNVisitor {
 private:
     // MEMBERS
     AstUser1InUse m_inuser1;
     string m_prefix;  // String prefix to add to name based on hier
     AstScope* m_classScopep = nullptr;  // Package moving scopes into
+    AstScope* m_packageScopep = nullptr;  // Class package scope
+    AstNodeFTask* m_ftaskp = nullptr;  // Current task
     typedef std::vector<std::pair<AstNode*, AstScope*>> MoveVector;
     MoveVector m_moves;
 
@@ -54,7 +56,7 @@ private:
         // Note origName is the same as the class origName so errors look correct
         AstClassPackage* packagep = new AstClassPackage(nodep->fileline(), nodep->origName());
         packagep->name(nodep->name() + "__Vclpkg");
-        nodep->packagep(packagep);
+        nodep->classOrPackagep(packagep);
         packagep->classp(nodep);
         v3Global.rootp()->addModulep(packagep);
         // Add package to hierarchy
@@ -76,14 +78,17 @@ private:
         packagep->addStmtp(scopep);
         // Iterate
         VL_RESTORER(m_prefix);
+        VL_RESTORER(m_classScopep);
+        VL_RESTORER(m_packageScopep);
         {
             m_classScopep = classScopep;
+            m_packageScopep = scopep;
             m_prefix = nodep->name() + "__02e";  // .
             iterateChildren(nodep);
         }
-        m_classScopep = nullptr;
     }
-    virtual void visit(AstPackage* nodep) override {
+    virtual void visit(AstNodeModule* nodep) override {
+        // Visit for NodeModules that are not AstClass (AstClass is-a AstNodeModule)
         VL_RESTORER(m_prefix);
         {
             m_prefix = nodep->name() + "__03a__03a";  // ::
@@ -94,11 +99,28 @@ private:
     virtual void visit(AstVar* nodep) override {
         iterateChildren(nodep);
         // Don't move now, or wouldn't keep interating the class
-        // TODO move class statics only
-        // if (m_classScopep) {
-        //    m_moves.push_back(make_pair(nodep, m_classScopep));
-        //}
+        // TODO move class statics too
+        if (m_packageScopep && m_ftaskp && m_ftaskp->lifetime().isStatic()) {
+            m_moves.push_back(make_pair(nodep, m_packageScopep));
+        }
     }
+
+    virtual void visit(AstVarScope* nodep) override {
+        iterateChildren(nodep);
+        nodep->varp()->user1p(nodep);
+    }
+
+    virtual void visit(AstNodeFTask* nodep) override {
+        VL_RESTORER(m_ftaskp);
+        {
+            m_ftaskp = nodep;
+            iterateChildren(nodep);
+            if (m_packageScopep && nodep->lifetime().isStatic()) {
+                m_moves.push_back(make_pair(nodep, m_packageScopep));
+            }
+        }
+    }
+
     virtual void visit(AstCFunc* nodep) override {
         iterateChildren(nodep);
         // Don't move now, or wouldn't keep interating the class
@@ -116,8 +138,13 @@ public:
     // CONSTRUCTORS
     explicit ClassVisitor(AstNetlist* nodep) { iterate(nodep); }
     virtual ~ClassVisitor() override {
-        for (MoveVector::iterator it = m_moves.begin(); it != m_moves.end(); ++it) {
-            it->second->addVarp(it->first->unlinkFrBack());
+        for (auto moved : m_moves) {
+            if (VN_IS(moved.first, NodeFTask)) {
+                moved.second->addActivep(moved.first->unlinkFrBack());
+            } else if (VN_IS(moved.first, Var)) {
+                AstVarScope* scopep = VN_CAST(moved.first->user1p(), VarScope);
+                moved.second->addVarp(scopep->unlinkFrBack());
+            }
         }
     }
 };

src/V3Class.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Class {
+class V3Class final {
 public:
     static void classAll(AstNetlist* nodep);
 };

src/V3Clean.cpp

@@ -35,7 +35,7 @@
 //######################################################################
 // Clean state, as a visitor of each AstNode
 
-class CleanVisitor : public AstNVisitor {
+class CleanVisitor final : public AstNVisitor {
 private:
     // NODE STATE
     // Entire netlist:
@@ -285,6 +285,11 @@ private:
         ensureCleanAndNext(nodep->pinsp());
         setClean(nodep, true);
     }
+    virtual void visit(AstWith* nodep) override {
+        iterateChildren(nodep);
+        ensureCleanAndNext(nodep->exprp());
+        setClean(nodep, true);
+    }
     virtual void visit(AstIntfRef* nodep) override {
         iterateChildren(nodep);
         setClean(nodep, true);  // generates a string, so not relevant
@@ -300,7 +305,7 @@ private:
 public:
     // CONSTRUCTORS
     explicit CleanVisitor(AstNetlist* nodep) { iterate(nodep); }
-    virtual ~CleanVisitor() override {}
+    virtual ~CleanVisitor() override = default;
 };
 
 //######################################################################

src/V3Clean.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Clean {
+class V3Clean final {
 public:
     static void cleanAll(AstNetlist* nodep);
 };

src/V3Clock.cpp

@@ -40,7 +40,7 @@
 //######################################################################
 // Clock state, as a visitor of each AstNode
 
-class ClockVisitor : public AstNVisitor {
+class ClockVisitor final : public AstNVisitor {
 private:
     // NODE STATE
     // Cleared each Module:
@@ -79,15 +79,15 @@ private:
         vscp->user1p(newvscp);
         m_scopep->addVarp(newvscp);
         // Add init
-        AstNode* fromp = new AstVarRef(newvarp->fileline(), vscp, false);
+        AstNode* fromp = new AstVarRef(newvarp->fileline(), vscp, VAccess::READ);
         if (v3Global.opt.xInitialEdge()) fromp = new AstNot(fromp->fileline(), fromp);
         AstNode* newinitp = new AstAssign(
-            vscp->fileline(), new AstVarRef(newvarp->fileline(), newvscp, true), fromp);
+            vscp->fileline(), new AstVarRef(newvarp->fileline(), newvscp, VAccess::WRITE), fromp);
         addToInitial(newinitp);
         // At bottom, assign them
-        AstAssign* finalp
-            = new AstAssign(vscp->fileline(), new AstVarRef(vscp->fileline(), newvscp, true),
-                            new AstVarRef(vscp->fileline(), vscp, false));
+        AstAssign* finalp = new AstAssign(vscp->fileline(),
+                                          new AstVarRef(vscp->fileline(), newvscp, VAccess::WRITE),
+                                          new AstVarRef(vscp->fileline(), vscp, VAccess::READ));
         m_evalFuncp->addFinalsp(finalp);
         //
         UINFO(4, "New Last: " << newvscp << endl);
@@ -112,25 +112,28 @@ private:
             AstVarScope* lastVscp = getCreateLastClk(clkvscp);
             newp = new AstAnd(
                 nodep->fileline(),
-                new AstVarRef(nodep->fileline(), nodep->varrefp()->varScopep(), false),
-                new AstNot(nodep->fileline(), new AstVarRef(nodep->fileline(), lastVscp, false)));
+                new AstVarRef(nodep->fileline(), nodep->varrefp()->varScopep(), VAccess::READ),
+                new AstNot(nodep->fileline(),
+                           new AstVarRef(nodep->fileline(), lastVscp, VAccess::READ)));
         } else if (nodep->edgeType() == VEdgeType::ET_NEGEDGE) {
             AstVarScope* lastVscp = getCreateLastClk(clkvscp);
             newp = new AstAnd(
                 nodep->fileline(),
                 new AstNot(nodep->fileline(),
-                           new AstVarRef(nodep->fileline(), nodep->varrefp()->varScopep(), false)),
-                new AstVarRef(nodep->fileline(), lastVscp, false));
+                           new AstVarRef(nodep->fileline(), nodep->varrefp()->varScopep(),
+                                         VAccess::READ)),
+                new AstVarRef(nodep->fileline(), lastVscp, VAccess::READ));
         } else if (nodep->edgeType() == VEdgeType::ET_BOTHEDGE) {
             AstVarScope* lastVscp = getCreateLastClk(clkvscp);
             newp = new AstXor(
                 nodep->fileline(),
-                new AstVarRef(nodep->fileline(), nodep->varrefp()->varScopep(), false),
-                new AstVarRef(nodep->fileline(), lastVscp, false));
+                new AstVarRef(nodep->fileline(), nodep->varrefp()->varScopep(), VAccess::READ),
+                new AstVarRef(nodep->fileline(), lastVscp, VAccess::READ));
         } else if (nodep->edgeType() == VEdgeType::ET_HIGHEDGE) {
-            newp = new AstVarRef(nodep->fileline(), clkvscp, false);
+            newp = new AstVarRef(nodep->fileline(), clkvscp, VAccess::READ);
         } else if (nodep->edgeType() == VEdgeType::ET_LOWEDGE) {
-            newp = new AstNot(nodep->fileline(), new AstVarRef(nodep->fileline(), clkvscp, false));
+            newp = new AstNot(nodep->fileline(),
+                              new AstVarRef(nodep->fileline(), clkvscp, VAccess::READ));
         } else {
             nodep->v3fatalSrc("Bad edge type");
         }
@@ -290,7 +293,7 @@ private:
         }
         m_scopep = nullptr;
     }
-    virtual void visit(AstAlways* nodep) override {
+    virtual void visit(AstNodeProcedure* nodep) override {
         AstNode* cmtp = new AstComment(nodep->fileline(), nodep->typeName(), true);
         nodep->replaceWith(cmtp);
         if (AstNode* stmtsp = nodep->bodysp()) {
@@ -308,6 +311,15 @@ private:
         }
         VL_DO_DANGLING(nodep->deleteTree(), nodep);
     }
+    virtual void visit(AstAlwaysPostponed* nodep) override {
+        AstNode* cmtp = new AstComment(nodep->fileline(), nodep->typeName(), true);
+        nodep->replaceWith(cmtp);
+        if (AstNode* stmtsp = nodep->bodysp()) {
+            stmtsp->unlinkFrBackWithNext();
+            cmtp->addNextHere(stmtsp);
+        }
+        VL_DO_DANGLING(nodep->deleteTree(), nodep);
+    }
     virtual void visit(AstCoverToggle* nodep) override {
         // nodep->dumpTree(cout, "ct:");
         // COVERTOGGLE(INC, ORIG, CHANGE) ->
@@ -325,15 +337,6 @@ private:
         nodep->replaceWith(newp);
         VL_DO_DANGLING(nodep->deleteTree(), nodep);
     }
-    virtual void visit(AstInitial* nodep) override {
-        AstNode* cmtp = new AstComment(nodep->fileline(), nodep->typeName(), true);
-        nodep->replaceWith(cmtp);
-        if (AstNode* stmtsp = nodep->bodysp()) {
-            stmtsp->unlinkFrBackWithNext();
-            cmtp->addNextHere(stmtsp);
-        }
-        VL_DO_DANGLING(nodep->deleteTree(), nodep);
-    }
     virtual void visit(AstCFunc* nodep) override {
         iterateChildren(nodep);
         // Link to global function
@@ -451,7 +454,7 @@ public:
         // easily without iterating through the tree.
         nodep->evalp(m_evalFuncp);
     }
-    virtual ~ClockVisitor() override {}
+    virtual ~ClockVisitor() override = default;
 };
 
 //######################################################################

src/V3Clock.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Clock {
+class V3Clock final {
 public:
     static void clockAll(AstNetlist* nodep);
 };

src/V3Combine.cpp

@@ -51,19 +51,19 @@ constexpr int COMBINE_MIN_STATEMENTS = 50;  // Min # of statements to be worth m
 
 //######################################################################
 
-class CombBaseVisitor : public AstNVisitor {
+class CombBaseVisitor VL_NOT_FINAL : public AstNVisitor {
 protected:
     // STATE
 
     // METHODS
-    virtual ~CombBaseVisitor() override {}
+    virtual ~CombBaseVisitor() override = default;
     VL_DEBUG_FUNC;  // Declare debug()
 };
 
 //######################################################################
 // Combine replacement function
 
-class CombCallVisitor : CombBaseVisitor {
+class CombCallVisitor final : CombBaseVisitor {
     // Find all CCALLS of each CFUNC, so that we can later rename them
 private:
     // NODE STATE
@@ -131,15 +131,15 @@ private:
 
 public:
     // CONSTRUCTORS
-    CombCallVisitor() {}
-    virtual ~CombCallVisitor() override {}
+    CombCallVisitor() = default;
+    virtual ~CombCallVisitor() override = default;
     void main(AstNetlist* nodep) { iterate(nodep); }
 };
 
 //######################################################################
 // Combine marking function
 
-class CombMarkVisitor : CombBaseVisitor {
+class CombMarkVisitor final : CombBaseVisitor {
     // Mark all nodes under specified one.
 private:
     // OUTPUT:
@@ -153,13 +153,13 @@ private:
 public:
     // CONSTRUCTORS
     explicit CombMarkVisitor(AstNode* nodep) { iterate(nodep); }
-    virtual ~CombMarkVisitor() override {}
+    virtual ~CombMarkVisitor() override = default;
 };
 
 //######################################################################
 // Combine state, as a visitor of each AstNode
 
-class CombineVisitor : CombBaseVisitor {
+class CombineVisitor final : CombBaseVisitor {
 private:
     // NODE STATE
     // Entire netlist:
@@ -177,7 +177,7 @@ private:
     VDouble0 m_statCombs;  // Statistic tracking
     CombineState m_state = STATE_IDLE;  // Major state
     AstNodeModule* m_modp = nullptr;  // Current module
-    AstCFunc* m_funcp = nullptr;  // Current function
+    AstCFunc* m_cfuncp = nullptr;  // Current function
     CombCallVisitor m_call;  // Tracking of function call users
     int m_modNFuncs = 0;  // Number of functions made
 #ifdef VL_COMBINE_STATEMENTS
@@ -203,8 +203,8 @@ private:
     }
 #endif
     void walkEmptyFuncs() {
-        for (V3Hashed::iterator it = m_hashed.begin(); it != m_hashed.end(); ++it) {
-            AstNode* node1p = it->second;
+        for (const auto& itr : m_hashed) {
+            AstNode* node1p = itr.second;
             AstCFunc* oldfuncp = VN_CAST(node1p, CFunc);
             if (oldfuncp && oldfuncp->emptyBody() && !oldfuncp->dontCombine()) {
                 UINFO(5, "     EmptyFunc " << std::hex << V3Hash(oldfuncp->user4p()) << " "
@@ -330,7 +330,7 @@ private:
                      AstNode* last2p) {  // Final node in linked list, maybe null if all statements
                                          // to be grabbed
         // Make new function
-        string oldname = m_funcp->name();
+        string oldname = m_cfuncp->name();
         string::size_type pos;
         if ((pos = oldname.find("_common")) != string::npos) oldname.erase(pos);
         if ((pos = oldname.find("__")) != string::npos) oldname.erase(pos);
@@ -423,7 +423,8 @@ private:
         m_modp = nullptr;
     }
     virtual void visit(AstCFunc* nodep) override {
-        m_funcp = nodep;
+        VL_RESTORER(m_cfuncp);
+        m_cfuncp = nodep;
         if (!nodep->dontCombine()) {
             if (m_state == STATE_HASH) {
                 hashStatement(nodep);  // Hash the entire function - it might be identical
@@ -434,18 +435,17 @@ private:
             }
 #endif
         }
-        m_funcp = nullptr;
     }
     virtual void visit(AstNodeStmt* nodep) override {
         if (!nodep->isStatement()) {
             iterateChildren(nodep);
             return;
         }
-        if (m_state == STATE_HASH && m_funcp) {
+        if (m_state == STATE_HASH && m_cfuncp) {
             hashStatement(nodep);
         }
 #ifdef VL_COMBINE_STATEMENTS
-        else if (m_state == STATE_DUP && m_funcp) {
+        else if (m_state == STATE_DUP && m_cfuncp) {
             walkDupCodeStart(nodep);
         }
 #endif

src/V3Combine.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Combine {
+class V3Combine final {
 public:
     static void combineAll(AstNetlist* nodep);
 };

src/V3Config.cpp

@@ -33,13 +33,13 @@
 // cache of resolved entities. Entities stored in this container need an update
 // function that takes a reference of this type to join multiple entities into one.
 template <typename T> class V3ConfigWildcardResolver {
-    typedef std::map<string, T> Map;
+    typedef std::map<const string, T> Map;
 
     Map m_mapWildcard;  // Wildcard strings to entities
     Map m_mapResolved;  // Resolved strings to converged entities
 public:
-    V3ConfigWildcardResolver() {}
-    ~V3ConfigWildcardResolver() {}
+    V3ConfigWildcardResolver() = default;
+    ~V3ConfigWildcardResolver() = default;
 
     /// Update into maps from other
     void update(const V3ConfigWildcardResolver& other) {
@@ -82,7 +82,7 @@ public:
 };
 
 // Only public_flat_rw has the sensitity tree
-class V3ConfigVarAttr {
+class V3ConfigVarAttr final {
 public:
     AstAttrType m_type;  // Type of attribute
     AstSenTree* m_sentreep;  // Sensitivity tree for public_flat_rw
@@ -92,7 +92,7 @@ public:
 };
 
 // Overload vector with the required update function and to apply all entries
-class V3ConfigVar : public std::vector<V3ConfigVarAttr> {
+class V3ConfigVar final : public std::vector<V3ConfigVarAttr> {
 public:
     // Update from other by copying all attributes
     void update(const V3ConfigVar& node) {
@@ -116,14 +116,14 @@ typedef V3ConfigWildcardResolver<V3ConfigVar> V3ConfigVarResolver;
 //######################################################################
 // Function or task: Have variables and properties
 
-class V3ConfigFTask {
+class V3ConfigFTask final {
     V3ConfigVarResolver m_vars;  // Variables in function/task
     bool m_isolate = false;  // Isolate function return
     bool m_noinline = false;  // Don't inline function/task
     bool m_public = false;  // Public function/task
 
 public:
-    V3ConfigFTask() {}
+    V3ConfigFTask() = default;
     void update(const V3ConfigFTask& f) {
         // Don't overwrite true with false
         if (f.m_isolate) m_isolate = true;
@@ -153,7 +153,7 @@ typedef V3ConfigWildcardResolver<V3ConfigFTask> V3ConfigFTaskResolver;
 //######################################################################
 // Modules have tasks, variables, named blocks and properties
 
-class V3ConfigModule {
+class V3ConfigModule final {
     typedef std::unordered_set<string> StringSet;
     typedef std::set<AstPragmaType> PragmaSet;
 
@@ -165,7 +165,7 @@ class V3ConfigModule {
     bool m_inlineValue = false;  // The inline value (on/off)
 
 public:
-    V3ConfigModule() {}
+    V3ConfigModule() = default;
 
     void update(const V3ConfigModule& m) {
         m_tasks.update(m.m_tasks);
@@ -224,7 +224,7 @@ typedef V3ConfigWildcardResolver<V3ConfigModule> V3ConfigModuleResolver;
 //  - Line attributes: Attributes attached to lines
 
 // lint/coverage/tracing on/off
-class V3ConfigIgnoresLine {
+class V3ConfigIgnoresLine final {
 public:
     int m_lineno;  // Line number to make change at
     V3ErrorCode m_code;  // Error code
@@ -233,8 +233,8 @@ public:
         : m_lineno{lineno}
         , m_code{code}
         , m_on{on} {}
-    ~V3ConfigIgnoresLine() {}
-    inline bool operator<(const V3ConfigIgnoresLine& rh) const {
+    ~V3ConfigIgnoresLine() = default;
+    bool operator<(const V3ConfigIgnoresLine& rh) const {
         if (m_lineno < rh.m_lineno) return true;
         if (m_lineno > rh.m_lineno) return false;
         if (m_code < rh.m_code) return true;
@@ -253,7 +253,7 @@ std::ostream& operator<<(std::ostream& os, const V3ConfigIgnoresLine& rhs) {
 typedef std::bitset<AstPragmaType::ENUM_SIZE> V3ConfigLineAttribute;
 
 // File entity
-class V3ConfigFile {
+class V3ConfigFile final {
     typedef std::map<int, V3ConfigLineAttribute> LineAttrMap;  // Map line->bitset of attributes
     typedef std::multiset<V3ConfigIgnoresLine> IgnLines;  // list of {line,code,on}
     typedef std::pair<V3ErrorCode, string> WaiverSetting;  // Waive code if string matches
@@ -282,15 +282,9 @@ public:
     }
     void update(const V3ConfigFile& file) {
         // Copy in all Attributes
-        for (LineAttrMap::const_iterator it = file.m_lineAttrs.begin();
-             it != file.m_lineAttrs.end(); ++it) {
-            m_lineAttrs[it->first] |= it->second;
-        }
+        for (const auto& itr : file.m_lineAttrs) { m_lineAttrs[itr.first] |= itr.second; }
         // Copy in all ignores
-        for (IgnLines::const_iterator it = file.m_ignLines.begin(); it != file.m_ignLines.end();
-             ++it) {
-            m_ignLines.insert(*it);
-        }
+        for (const auto& ignLine : file.m_ignLines) m_ignLines.insert(ignLine);
         // Update the iterator after the list has changed
         m_lastIgnore.it = m_ignLines.begin();
         m_waivers.reserve(m_waivers.size() + file.m_waivers.size());
@@ -338,9 +332,9 @@ public:
         }
     }
     bool waive(V3ErrorCode code, const string& match) {
-        for (Waivers::const_iterator it = m_waivers.begin(); it != m_waivers.end(); ++it) {
-            if (((it->first == code) || (it->first == V3ErrorCode::I_LINT))
-                && VString::wildmatch(match, it->second)) {
+        for (const auto& itr : m_waivers) {
+            if (((itr.first == code) || (itr.first == V3ErrorCode::I_LINT))
+                && VString::wildmatch(match, itr.second)) {
                 return true;
             }
         }
@@ -353,16 +347,16 @@ typedef V3ConfigWildcardResolver<V3ConfigFile> V3ConfigFileResolver;
 //######################################################################
 // Resolve modules and files in the design
 
-class V3ConfigResolver {
+class V3ConfigResolver final {
     V3ConfigModuleResolver m_modules;  // Access to module names (with wildcards)
     V3ConfigFileResolver m_files;  // Access to file names (with wildcards)
 
     static V3ConfigResolver s_singleton;  // Singleton (not via local static, as that's slow)
-    V3ConfigResolver() {}
-    ~V3ConfigResolver() {}
+    V3ConfigResolver() = default;
+    ~V3ConfigResolver() = default;
 
 public:
-    inline static V3ConfigResolver& s() { return s_singleton; }
+    static V3ConfigResolver& s() { return s_singleton; }
 
     V3ConfigModuleResolver& modules() { return m_modules; }
     V3ConfigFileResolver& files() { return m_files; }
@@ -411,7 +405,7 @@ void V3Config::addInline(FileLine* fl, const string& module, const string& ftask
         V3ConfigResolver::s().modules().at(module).setInline(on);
     } else {
         if (!on) {
-            fl->v3error("no_inline not supported for tasks" << endl);
+            fl->v3error("no_inline not supported for tasks");
         } else {
             V3ConfigResolver::s().modules().at(module).ftasks().at(ftask).setNoInline(on);
         }
@@ -422,15 +416,14 @@ void V3Config::addVarAttr(FileLine* fl, const string& module, const string& ftas
                           const string& var, AstAttrType attr, AstSenTree* sensep) {
     // Semantics: sensep only if public_flat_rw
     if ((attr != AstAttrType::VAR_PUBLIC_FLAT_RW) && sensep) {
-        sensep->v3error("sensitivity not expected for attribute" << endl);
+        sensep->v3error("sensitivity not expected for attribute");
         return;
     }
     // Semantics: Most of the attributes operate on signals
     if (var.empty()) {
         if (attr == AstAttrType::VAR_ISOLATE_ASSIGNMENTS) {
             if (ftask.empty()) {
-                fl->v3error("isolate_assignments only applies to signals or functions/tasks"
-                            << endl);
+                fl->v3error("isolate_assignments only applies to signals or functions/tasks");
             } else {
                 V3ConfigResolver::s().modules().at(module).ftasks().at(ftask).setIsolate(true);
             }
@@ -443,7 +436,7 @@ void V3Config::addVarAttr(FileLine* fl, const string& module, const string& ftas
                 V3ConfigResolver::s().modules().at(module).ftasks().at(ftask).setPublic(true);
             }
         } else {
-            fl->v3error("missing -signal" << endl);
+            fl->v3error("missing -signal");
         }
     } else {
         V3ConfigModule& mod = V3ConfigResolver::s().modules().at(module);

src/V3Config.h

@@ -26,7 +26,7 @@
 
 //######################################################################
 
-class V3Config {
+class V3Config final {
 public:
     static void addCaseFull(const string& file, int lineno);
     static void addCaseParallel(const string& file, int lineno);

src/V3Const.cpp

@@ -36,7 +36,7 @@
 //######################################################################
 // Utilities
 
-class ConstVarMarkVisitor : public AstNVisitor {
+class ConstVarMarkVisitor final : public AstNVisitor {
     // NODE STATE
     // AstVar::user4p           -> bool, Var marked, 0=not set yet
 private:
@@ -52,10 +52,10 @@ public:
         AstNode::user4ClearTree();  // Check marked InUse before we're called
         iterate(nodep);
     }
-    virtual ~ConstVarMarkVisitor() override {}
+    virtual ~ConstVarMarkVisitor() override = default;
 };
 
-class ConstVarFindVisitor : public AstNVisitor {
+class ConstVarFindVisitor final : public AstNVisitor {
     // NODE STATE
     // AstVar::user4p           -> bool, input from ConstVarMarkVisitor
     // MEMBERS
@@ -71,7 +71,7 @@ private:
 public:
     // CONSTRUCTORS
     explicit ConstVarFindVisitor(AstNode* nodep) { iterateAndNextNull(nodep); }
-    virtual ~ConstVarFindVisitor() override {}
+    virtual ~ConstVarFindVisitor() override = default;
     // METHODS
     bool found() const { return m_found; }
 };
@@ -79,7 +79,7 @@ public:
 //######################################################################
 // Const state, as a visitor of each AstNode
 
-class ConstVisitor : public AstNVisitor {
+class ConstVisitor final : public AstNVisitor {
 private:
     // NODE STATE
     // ** only when m_warn/m_doExpensive is set.  If state is needed other times,
@@ -314,7 +314,7 @@ private:
         // It was an expression, then got constified.  In reality, the WordSel
         // must be wrapped in a Cond, that will be false.
         return (VN_IS(nodep->rhsp(), Const) && VN_IS(nodep->fromp(), NodeVarRef)
-                && !VN_CAST_CONST(nodep->fromp(), NodeVarRef)->lvalue()
+                && VN_CAST_CONST(nodep->fromp(), NodeVarRef)->access().isReadOnly()
                 && (static_cast<int>(VN_CAST_CONST(nodep->rhsp(), Const)->toUInt())
                     >= VN_CAST(nodep->fromp(), NodeVarRef)->varp()->widthWords()));
     }
@@ -1132,18 +1132,22 @@ private:
                                             VFlagLogicPacked(), msb2 - lsb2 + 1);
                 m_modp->addStmtp(temp1p);
                 m_modp->addStmtp(temp2p);
-                AstNodeAssign* asn1ap = VN_CAST(
-                    nodep->cloneType(new AstVarRef(sel1p->fileline(), temp1p, true), sel1p),
-                    NodeAssign);
-                AstNodeAssign* asn2ap = VN_CAST(
-                    nodep->cloneType(new AstVarRef(sel2p->fileline(), temp2p, true), sel2p),
-                    NodeAssign);
-                AstNodeAssign* asn1bp = VN_CAST(
-                    nodep->cloneType(lc1p, new AstVarRef(sel1p->fileline(), temp1p, false)),
-                    NodeAssign);
-                AstNodeAssign* asn2bp = VN_CAST(
-                    nodep->cloneType(lc2p, new AstVarRef(sel2p->fileline(), temp2p, false)),
-                    NodeAssign);
+                AstNodeAssign* asn1ap
+                    = VN_CAST(nodep->cloneType(
+                                  new AstVarRef(sel1p->fileline(), temp1p, VAccess::WRITE), sel1p),
+                              NodeAssign);
+                AstNodeAssign* asn2ap
+                    = VN_CAST(nodep->cloneType(
+                                  new AstVarRef(sel2p->fileline(), temp2p, VAccess::WRITE), sel2p),
+                              NodeAssign);
+                AstNodeAssign* asn1bp
+                    = VN_CAST(nodep->cloneType(
+                                  lc1p, new AstVarRef(sel1p->fileline(), temp1p, VAccess::READ)),
+                              NodeAssign);
+                AstNodeAssign* asn2bp
+                    = VN_CAST(nodep->cloneType(
+                                  lc2p, new AstVarRef(sel2p->fileline(), temp2p, VAccess::READ)),
+                              NodeAssign);
                 asn1ap->dtypeFrom(temp1p);
                 asn1bp->dtypeFrom(temp1p);
                 asn2ap->dtypeFrom(temp2p);
@@ -1258,7 +1262,7 @@ private:
             AstNode* errorp = simvis.whyNotNodep();
             if (!errorp) errorp = nodep;
             nodep->v3error("Expecting expression to be constant, but can't determine constant for "
-                           << nodep->prettyTypeName() << endl
+                           << nodep->prettyTypeName() << '\n'
                            << errorp->warnOther() << "... Location of non-constant "
                            << errorp->prettyTypeName() << ": " << simvis.whyNotMessage());
             VL_DO_DANGLING(replaceZero(nodep), nodep);
@@ -1293,17 +1297,21 @@ private:
     virtual void visit(AstCFunc* nodep) override {
         // No ASSIGNW removals under funcs, we've long eliminated INITIALs
         // (We should perhaps rename the assignw's to just assigns)
-        m_wremove = false;
-        iterateChildren(nodep);
-        m_wremove = true;
+        VL_RESTORER(m_wremove);
+        {
+            m_wremove = false;
+            iterateChildren(nodep);
+        }
     }
     virtual void visit(AstScope* nodep) override {
         // No ASSIGNW removals under scope, we've long eliminated INITIALs
-        m_scopep = nodep;
-        m_wremove = false;
-        iterateChildren(nodep);
-        m_wremove = true;
-        m_scopep = nullptr;
+        VL_RESTORER(m_wremove);
+        VL_RESTORER(m_scopep);
+        {
+            m_wremove = false;
+            m_scopep = nodep;
+            iterateChildren(nodep);
+        }
     }
 
     void swapSides(AstNodeBiCom* nodep) {
@@ -1601,7 +1609,7 @@ private:
             // if (debug()) valuep->dumpTree(cout, "  visitvaref: ");
             iterateAndNextNull(nodep->varp()->valuep());  // May change nodep->varp()->valuep()
             AstNode* valuep = nodep->varp()->valuep();
-            if (!nodep->lvalue()
+            if (nodep->access().isReadOnly()
                 && ((!m_params  // Can reduce constant wires into equations
                      && m_doNConst
                      && v3Global.opt.oConst()
@@ -1722,7 +1730,7 @@ private:
     }
 
     struct SenItemCmp {
-        inline bool operator()(const AstSenItem* lhsp, const AstSenItem* rhsp) const {
+        bool operator()(const AstSenItem* lhsp, const AstSenItem* rhsp) const {
             if (lhsp->type() < rhsp->type()) return true;
             if (lhsp->type() > rhsp->type()) return false;
             // Looks visually better if we keep sorted by name
@@ -1922,8 +1930,9 @@ private:
                 nodep->replaceWith(ifp);
                 VL_DO_DANGLING(nodep->deleteTree(), nodep);
             } else if (ifSameAssign(nodep)) {
-                UINFO(4, "IF({a}) ASSIGN({b},{c}) else ASSIGN({b},{d}) => ASSIGN({b}, {a}?{c}:{d})"
-                             << endl);
+                UINFO(
+                    4,
+                    "IF({a}) ASSIGN({b},{c}) else ASSIGN({b},{d}) => ASSIGN({b}, {a}?{c}:{d})\n");
                 AstNodeAssign* ifp = VN_CAST(nodep->ifsp(), NodeAssign);
                 AstNodeAssign* elsep = VN_CAST(nodep->elsesp(), NodeAssign);
                 ifp->unlinkFrBack();
@@ -1933,7 +1942,8 @@ private:
                 ifp->rhsp(new AstCond(truep->fileline(), condp, truep, falsep));
                 nodep->replaceWith(ifp);
                 VL_DO_DANGLING(nodep->deleteTree(), nodep);
-            } else if (0  // Disabled, as vpm assertions are faster without due to short-circuiting
+            } else if (false  // Disabled, as vpm assertions are faster
+                              // without due to short-circuiting
                        && operandIfIf(nodep)) {
                 UINFO(9, "IF({a}) IF({b}) => IF({a} && {b})" << endl);
                 AstNodeIf* lowerIfp = VN_CAST(nodep->ifsp(), NodeIf);
@@ -2554,7 +2564,7 @@ public:
         }
         // clang-format on
     }
-    virtual ~ConstVisitor() override {}
+    virtual ~ConstVisitor() override = default;
     AstNode* mainAcceptEdit(AstNode* nodep) {
         // Operate starting at a random place
         return iterateSubtreeReturnEdits(nodep);

src/V3Const.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Const {
+class V3Const final {
 public:
     static AstNode* constifyParamsEdit(AstNode* nodep);
     static AstNode* constifyGenerateParamsEdit(AstNode* nodep);

src/V3Coverage.cpp

@@ -37,7 +37,7 @@
 //######################################################################
 // Coverage state, as a visitor of each AstNode
 
-class CoverageVisitor : public AstNVisitor {
+class CoverageVisitor final : public AstNVisitor {
 private:
     // TYPES
     typedef std::unordered_map<string, int> VarNameMap;
@@ -52,7 +52,7 @@ private:
             : m_comment{comment}
             , m_varRefp{vp}
             , m_chgRefp{cp} {}
-        ~ToggleEnt() {}
+        ~ToggleEnt() = default;
         void cleanup() {
             VL_DO_CLEAR(m_varRefp->deleteTree(), m_varRefp = nullptr);
             VL_DO_CLEAR(m_chgRefp->deleteTree(), m_chgRefp = nullptr);
@@ -64,7 +64,7 @@ private:
         bool m_inModOff = false;  // In module with no coverage
         int m_handle = 0;  // Opaque handle for index into line tracking
         const AstNode* m_nodep = nullptr;  // Node establishing this state
-        CheckState() {}
+        CheckState() = default;
         bool lineCoverageOn(const AstNode* nodep) const {
             return m_on && !m_inModOff && nodep->fileline()->coverageOn()
                    && v3Global.opt.coverageLine();
@@ -130,8 +130,8 @@ private:
             m_modp->addStmtp(varp);
             UINFO(5, "New coverage trace: " << varp << endl);
             AstAssign* assp = new AstAssign(
-                incp->fileline(), new AstVarRef(incp->fileline(), varp, true),
-                new AstAdd(incp->fileline(), new AstVarRef(incp->fileline(), varp, false),
+                incp->fileline(), new AstVarRef(incp->fileline(), varp, VAccess::WRITE),
+                new AstAdd(incp->fileline(), new AstVarRef(incp->fileline(), varp, VAccess::READ),
                            new AstConst(incp->fileline(), AstConst::WidthedValue(), 32, 1)));
             incp->addNext(assp);
         }
@@ -188,15 +188,15 @@ private:
         const LinenoSet& lines = m_handleLines[state.m_handle];
         int first = 0;
         int last = 0;
-        for (LinenoSet::iterator it = lines.begin(); it != lines.end(); ++it) {
+        for (int linen : lines) {
             if (!first) {
-                first = last = *it;
-            } else if (*it == last + 1) {
+                first = last = linen;
+            } else if (linen == last + 1) {
                 ++last;
             } else {
                 if (!out.empty()) out += ",";
                 out += linesFirstLast(first, last);
-                first = last = *it;
+                first = last = linen;
             }
         }
         if (first) {
@@ -288,8 +288,9 @@ private:
                 // This is necessarily an O(n^2) expansion, which is why
                 // we limit coverage to signals with < 256 bits.
 
-                ToggleEnt newvec(string(""), new AstVarRef(nodep->fileline(), nodep, false),
-                                 new AstVarRef(nodep->fileline(), chgVarp, true));
+                ToggleEnt newvec(string(""),
+                                 new AstVarRef(nodep->fileline(), nodep, VAccess::READ),
+                                 new AstVarRef(nodep->fileline(), chgVarp, VAccess::WRITE));
                 toggleVarRecurse(nodep->dtypeSkipRefp(), 0, newvec, nodep, chgVarp);
                 newvec.cleanup();
             }
@@ -533,7 +534,7 @@ private:
 public:
     // CONSTRUCTORS
     explicit CoverageVisitor(AstNetlist* rootp) { iterateChildren(rootp); }
-    virtual ~CoverageVisitor() override {}
+    virtual ~CoverageVisitor() override = default;
 };
 
 //######################################################################

src/V3Coverage.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Coverage {
+class V3Coverage final {
 public:
     // CONSTRUCTORS
     static void coverage(AstNetlist* rootp);

src/V3CoverageJoin.cpp

@@ -30,7 +30,7 @@
 //######################################################################
 // CoverageJoin state, as a visitor of each AstNode
 
-class CoverageJoinVisitor : public AstNVisitor {
+class CoverageJoinVisitor final : public AstNVisitor {
 private:
     // NODE STATE
     // V3Hashed

src/V3CoverageJoin.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3CoverageJoin {
+class V3CoverageJoin final {
 public:
     // CONSTRUCTORS
     static void coverageJoin(AstNetlist* rootp);

src/V3Dead.cpp

@@ -30,9 +30,8 @@
 // Note on packagep: After the V3Scope/V3LinkDotScoped stage, package links
 // are no longer used, but their presence prevents us from removing empty
 // packages. As the links as no longer used after V3Scope, we remove them
-// here after scoping to allow more dead node
-// removal.
-// *************************************************************************
+// here after scoping to allow more dead node removal.
+//*************************************************************************
 
 #include "config_build.h"
 #include "verilatedos.h"
@@ -46,7 +45,7 @@
 
 //######################################################################
 
-class DeadModVisitor : public AstNVisitor {
+class DeadModVisitor final : public AstNVisitor {
     // In a module that is dead, cleanup the in-use counts of the modules
 private:
     // NODE STATE
@@ -63,13 +62,13 @@ private:
 public:
     // CONSTRUCTORS
     explicit DeadModVisitor(AstNodeModule* nodep) { iterate(nodep); }
-    virtual ~DeadModVisitor() override {}
+    virtual ~DeadModVisitor() override = default;
 };
 
 //######################################################################
 // Dead state, as a visitor of each AstNode
 
-class DeadVisitor : public AstNVisitor {
+class DeadVisitor final : public AstNVisitor {
 private:
     // NODE STATE
     // Entire Netlist:
@@ -83,7 +82,7 @@ private:
     typedef std::multimap<AstVarScope*, AstNodeAssign*> AssignMap;
 
     // STATE
-    AstNodeModule* m_modp;  // Current module
+    AstNodeModule* m_modp = nullptr;  // Current module
     // List of all encountered to avoid another loop through tree
     std::vector<AstVar*> m_varsp;
     std::vector<AstNode*> m_dtypesp;
@@ -93,10 +92,10 @@ private:
     std::vector<AstClass*> m_classesp;
 
     AssignMap m_assignMap;  // List of all simple assignments for each variable
-    bool m_elimUserVars;  // Allow removal of user's vars
-    bool m_elimDTypes;  // Allow removal of DTypes
-    bool m_elimCells;  // Allow removal of Cells
-    bool m_sideEffect;  // Side effects discovered in assign RHS
+    const bool m_elimUserVars;  // Allow removal of user's vars
+    const bool m_elimDTypes;  // Allow removal of DTypes
+    const bool m_elimCells;  // Allow removal of Cells
+    bool m_sideEffect = false;  // Side effects discovered in assign RHS
 
     // METHODS
     VL_DEBUG_FUNC;  // Declare debug()
@@ -107,6 +106,9 @@ private:
         }
         if (AstNode* subnodep = nodep->getChildDTypep()) subnodep->user1Inc();
     }
+    void checkVarRef(AstNodeVarRef* nodep) {
+        if (nodep->classOrPackagep() && m_elimCells) nodep->classOrPackagep(nullptr);
+    }
     void checkDType(AstNodeDType* nodep) {
         if (!nodep->generic()  // Don't remove generic types
             && m_elimDTypes  // dtypes stick around until post-widthing
@@ -120,6 +122,7 @@ private:
 
     // VISITORS
     virtual void visit(AstNodeModule* nodep) override {
+        if (m_modp) m_modp->user1Inc();  // e.g. Class under Package
         VL_RESTORER(m_modp);
         {
             m_modp = nodep;
@@ -128,7 +131,7 @@ private:
                 checkAll(nodep);
                 if (AstClass* classp = VN_CAST(nodep, Class)) {
                     if (classp->extendsp()) classp->extendsp()->user1Inc();
-                    if (classp->packagep()) classp->packagep()->user1Inc();
+                    if (classp->classOrPackagep()) classp->classOrPackagep()->user1Inc();
                     m_classesp.push_back(classp);
                     // TODO we don't reclaim dead classes yet - graph implementation instead?
                     classp->user1Inc();
@@ -160,29 +163,25 @@ private:
     }
 
     virtual void visit(AstNodeVarRef* nodep) override {
+        // Note NodeAssign skips calling this in some cases
         iterateChildren(nodep);
         checkAll(nodep);
+        checkVarRef(nodep);
         if (nodep->varScopep()) {
             nodep->varScopep()->user1Inc();
             nodep->varScopep()->varp()->user1Inc();
         }
         if (nodep->varp()) nodep->varp()->user1Inc();
-        if (nodep->packagep()) {
-            if (m_elimCells) {
-                nodep->packagep(nullptr);
-            } else {
-                nodep->packagep()->user1Inc();
-            }
-        }
+        if (nodep->classOrPackagep()) nodep->classOrPackagep()->user1Inc();
     }
     virtual void visit(AstNodeFTaskRef* nodep) override {
         iterateChildren(nodep);
         checkAll(nodep);
-        if (nodep->packagep()) {
+        if (nodep->classOrPackagep()) {
             if (m_elimCells) {
-                nodep->packagep(nullptr);
+                nodep->classOrPackagep(nullptr);
             } else {
-                nodep->packagep()->user1Inc();
+                nodep->classOrPackagep()->user1Inc();
             }
         }
     }
@@ -196,11 +195,11 @@ private:
         checkAll(nodep);
         UASSERT_OBJ(!(m_elimCells && nodep->typedefp()), nodep,
                     "RefDType should point to data type before typedefs removed");
-        if (nodep->packagep()) {
+        if (nodep->classOrPackagep()) {
             if (m_elimCells) {
-                nodep->packagep(nullptr);
+                nodep->classOrPackagep(nullptr);
             } else {
-                nodep->packagep()->user1Inc();
+                nodep->classOrPackagep()->user1Inc();
             }
         }
     }
@@ -208,11 +207,11 @@ private:
         iterateChildren(nodep);
         checkDType(nodep);
         checkAll(nodep);
-        if (nodep->packagep()) {
+        if (nodep->classOrPackagep()) {
             if (m_elimCells) {
-                nodep->packagep(nullptr);
+                nodep->classOrPackagep(nullptr);
             } else {
-                nodep->packagep()->user1Inc();
+                nodep->classOrPackagep()->user1Inc();
             }
         }
         if (nodep->classp()) nodep->classp()->user1Inc();
@@ -225,11 +224,11 @@ private:
     virtual void visit(AstEnumItemRef* nodep) override {
         iterateChildren(nodep);
         checkAll(nodep);
-        if (nodep->packagep()) {
+        if (nodep->classOrPackagep()) {
             if (m_elimCells) {
-                nodep->packagep(nullptr);
+                nodep->classOrPackagep(nullptr);
             } else {
-                nodep->packagep()->user1Inc();
+                nodep->classOrPackagep()->user1Inc();
             }
         }
         checkAll(nodep);
@@ -277,19 +276,22 @@ private:
         // See if simple assignments to variables may be eliminated because
         // that variable is never used.
         // Similar code in V3Life
-        m_sideEffect = false;
-        iterateAndNextNull(nodep->rhsp());
-        checkAll(nodep);
-        // Has to be direct assignment without any EXTRACTing.
-        AstVarRef* varrefp = VN_CAST(nodep->lhsp(), VarRef);
-        if (varrefp && !m_sideEffect
-            && varrefp->varScopep()) {  // For simplicity, we only remove post-scoping
-            m_assignMap.insert(make_pair(varrefp->varScopep(), nodep));
-            checkAll(varrefp);  // Must track reference to dtype()
-        } else {  // Track like any other statement
-            iterateAndNextNull(nodep->lhsp());
+        VL_RESTORER(m_sideEffect);
+        {
+            m_sideEffect = false;
+            iterateAndNextNull(nodep->rhsp());
+            checkAll(nodep);
+            // Has to be direct assignment without any EXTRACTing.
+            AstVarRef* varrefp = VN_CAST(nodep->lhsp(), VarRef);
+            if (varrefp && !m_sideEffect
+                && varrefp->varScopep()) {  // For simplicity, we only remove post-scoping
+                m_assignMap.insert(make_pair(varrefp->varScopep(), nodep));
+                checkAll(varrefp);  // Must track reference to dtype()
+                checkVarRef(varrefp);
+            } else {  // Track like any other statement
+                iterateAndNextNull(nodep->lhsp());
+            }
         }
-        checkAll(nodep);
     }
 
     //-----
@@ -367,14 +369,13 @@ private:
     void deadCheckClasses() {
         for (bool retry = true; retry;) {
             retry = false;
-            for (std::vector<AstClass*>::iterator it = m_classesp.begin(); it != m_classesp.end();
-                 ++it) {
-                if (AstClass* nodep = *it) {  // nullptr if deleted earlier
+            for (auto& itr : m_classesp) {
+                if (AstClass* nodep = itr) {  // nullptr if deleted earlier
                     if (nodep->user1() == 0) {
                         if (nodep->extendsp()) nodep->extendsp()->user1Inc(-1);
-                        if (nodep->packagep()) nodep->packagep()->user1Inc(-1);
+                        if (nodep->classOrPackagep()) nodep->classOrPackagep()->user1Inc(-1);
                         VL_DO_DANGLING(pushDeletep(nodep->unlinkFrBack()), nodep);
-                        *it = nullptr;
+                        itr = nullptr;
                         retry = true;
                     }
                 }
@@ -439,12 +440,10 @@ private:
 public:
     // CONSTRUCTORS
     DeadVisitor(AstNetlist* nodep, bool elimUserVars, bool elimDTypes, bool elimScopes,
-                bool elimCells) {
-        m_modp = nullptr;
-        m_elimCells = elimCells;
-        m_elimUserVars = elimUserVars;
-        m_elimDTypes = elimDTypes;
-        m_sideEffect = false;
+                bool elimCells)
+        : m_elimUserVars{elimUserVars}
+        , m_elimDTypes{elimDTypes}
+        , m_elimCells{elimCells} {
         // Prepare to remove some datatypes
         nodep->typeTablep()->clearCache();
         // Operate on whole netlist
@@ -462,7 +461,7 @@ public:
         // We may have removed some datatypes, cleanup
         nodep->typeTablep()->repairCache();
     }
-    virtual ~DeadVisitor() override {}
+    virtual ~DeadVisitor() override = default;
 };
 
 //######################################################################

src/V3Dead.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Dead {
+class V3Dead final {
 public:
     // Modules, no vars/dtypes
     static void deadifyModules(AstNetlist* nodep);

src/V3Delayed.cpp

@@ -63,7 +63,7 @@
 //######################################################################
 // Delayed state, as a visitor of each AstNode
 
-class DelayedVisitor : public AstNVisitor {
+class DelayedVisitor final : public AstNVisitor {
 private:
     // NODE STATE
     // Cleared each module:
@@ -95,10 +95,10 @@ private:
     bool m_inDly = false;  // True in delayed assignments
     bool m_inLoop = false;  // True in for loops
     bool m_inInitial = false;  // True in initial blocks
-    typedef std::map<std::pair<AstNodeModule*, string>, AstVar*> VarMap;
+    typedef std::map<const std::pair<AstNodeModule*, string>, AstVar*> VarMap;
     VarMap m_modVarMap;  // Table of new var names created under module
     VDouble0 m_statSharedSet;  // Statistic tracking
-    typedef std::map<AstVarScope*, int> ScopeVecMap;
+    typedef std::unordered_map<const AstVarScope*, int> ScopeVecMap;
     ScopeVecMap m_scopeVecMap;  // Next var number for each scope
 
     // METHODS
@@ -160,10 +160,10 @@ private:
                 varrefp->varp()->v3warn(
                     MULTIDRIVEN,
                     "Signal has multiple driving blocks with different clocking: "
-                        << varrefp->varp()->prettyNameQ() << endl
-                        << varrefp->warnOther() << "... Location of first driving block" << endl
-                        << varrefp->warnContextPrimary() << endl
-                        << oldactivep->warnOther() << "... Location of other driving block" << endl
+                        << varrefp->varp()->prettyNameQ() << '\n'
+                        << varrefp->warnOther() << "... Location of first driving block\n"
+                        << varrefp->warnContextPrimary() << '\n'
+                        << oldactivep->warnOther() << "... Location of other driving block\n"
                         << oldactivep->warnContextSecondary());
                 varrefp->varp()->user2(true);
             }
@@ -228,9 +228,10 @@ private:
                 AstVarScope* bitvscp
                     = createVarSc(varrefp->varScopep(), bitvarname, dimp->width(), nullptr);
                 AstAssign* bitassignp = new AstAssign(
-                    nodep->fileline(), new AstVarRef(nodep->fileline(), bitvscp, true), dimp);
+                    nodep->fileline(), new AstVarRef(nodep->fileline(), bitvscp, VAccess::WRITE),
+                    dimp);
                 nodep->addNextHere(bitassignp);
-                dimreadps.push_front(new AstVarRef(nodep->fileline(), bitvscp, false));
+                dimreadps.push_front(new AstVarRef(nodep->fileline(), bitvscp, VAccess::READ));
             }
         }
         //
@@ -247,9 +248,10 @@ private:
                 AstVarScope* bitvscp
                     = createVarSc(varrefp->varScopep(), bitvarname, lsbvaluep->width(), nullptr);
                 AstAssign* bitassignp = new AstAssign(
-                    nodep->fileline(), new AstVarRef(nodep->fileline(), bitvscp, true), lsbvaluep);
+                    nodep->fileline(), new AstVarRef(nodep->fileline(), bitvscp, VAccess::WRITE),
+                    lsbvaluep);
                 nodep->addNextHere(bitassignp);
-                bitreadp = new AstVarRef(nodep->fileline(), bitvscp, false);
+                bitreadp = new AstVarRef(nodep->fileline(), bitvscp, VAccess::READ);
             }
         }
         //
@@ -263,8 +265,8 @@ private:
                 = (string("__Vdlyvval__") + oldvarp->shortName() + "__v" + cvtToStr(modVecNum));
             AstVarScope* valvscp
                 = createVarSc(varrefp->varScopep(), valvarname, 0, nodep->rhsp()->dtypep());
-            newlhsp = new AstVarRef(nodep->fileline(), valvscp, true);
-            valreadp = new AstVarRef(nodep->fileline(), valvscp, false);
+            newlhsp = new AstVarRef(nodep->fileline(), valvscp, VAccess::WRITE);
+            valreadp = new AstVarRef(nodep->fileline(), valvscp, VAccess::READ);
         }
         //
         //=== Setting/not setting boolean: __Vdlyvset__
@@ -283,11 +285,11 @@ private:
                 = (string("__Vdlyvset__") + oldvarp->shortName() + "__v" + cvtToStr(modVecNum));
             setvscp = createVarSc(varrefp->varScopep(), setvarname, 1, nullptr);
             setinitp = new AstAssignPre(nodep->fileline(),
-                                        new AstVarRef(nodep->fileline(), setvscp, true),
+                                        new AstVarRef(nodep->fileline(), setvscp, VAccess::WRITE),
                                         new AstConst(nodep->fileline(), 0));
-            AstAssign* setassignp
-                = new AstAssign(nodep->fileline(), new AstVarRef(nodep->fileline(), setvscp, true),
-                                new AstConst(nodep->fileline(), AstConst::LogicTrue()));
+            AstAssign* setassignp = new AstAssign(
+                nodep->fileline(), new AstVarRef(nodep->fileline(), setvscp, VAccess::WRITE),
+                new AstConst(nodep->fileline(), AstConst::BitTrue()));
             nodep->addNextHere(setassignp);
         }
         if (m_nextDlyp) {  // Tell next assigndly it can share the variable
@@ -332,9 +334,9 @@ private:
             UASSERT_OBJ(postLogicp, nodep,
                         "Delayed assignment misoptimized; prev var found w/o associated IF");
         } else {
-            postLogicp
-                = new AstIf(nodep->fileline(), new AstVarRef(nodep->fileline(), setvscp, false),
-                            nullptr, nullptr);
+            postLogicp = new AstIf(nodep->fileline(),
+                                   new AstVarRef(nodep->fileline(), setvscp, VAccess::READ),
+                                   nullptr, nullptr);
             UINFO(9, "     Created " << postLogicp << endl);
             finalp->addBodysp(postLogicp);
             finalp->user3p(setvscp);  // Remember IF's vset variable
@@ -356,9 +358,11 @@ private:
         iterateChildren(nodep);
     }
     virtual void visit(AstCFunc* nodep) override {
-        m_cfuncp = nodep;
-        iterateChildren(nodep);
-        m_cfuncp = nullptr;
+        VL_RESTORER(m_cfuncp);
+        {
+            m_cfuncp = nodep;
+            iterateChildren(nodep);
+        }
     }
     virtual void visit(AstActive* nodep) override {
         m_activep = nodep;
@@ -406,10 +410,11 @@ private:
 
     virtual void visit(AstVarRef* nodep) override {
         if (!nodep->user2Inc()) {  // Not done yet
-            if (m_inDly && nodep->lvalue()) {
+            if (m_inDly && nodep->access().isWriteOrRW()) {
                 UINFO(4, "AssignDlyVar: " << nodep << endl);
                 markVarUsage(nodep->varScopep(), VU_DLY);
                 UASSERT_OBJ(m_activep, nodep, "<= not under sensitivity block");
+                UASSERT_OBJ(!nodep->access().isRW(), nodep, "<= on read+write method");
                 if (!m_activep->hasClocked()) {
                     nodep->v3error("Internal: Blocking <= assignment in non-clocked block, should "
                                    "have converted in V3Active");
@@ -429,16 +434,19 @@ private:
                     if (basicp && basicp->isEventValue()) {
                         // Events go to zero on next timestep unless reactivated
                         prep = new AstAssignPre(
-                            nodep->fileline(), new AstVarRef(nodep->fileline(), dlyvscp, true),
-                            new AstConst(nodep->fileline(), AstConst::LogicFalse()));
+                            nodep->fileline(),
+                            new AstVarRef(nodep->fileline(), dlyvscp, VAccess::WRITE),
+                            new AstConst(nodep->fileline(), AstConst::BitFalse()));
                     } else {
-                        prep = new AstAssignPre(nodep->fileline(),
-                                                new AstVarRef(nodep->fileline(), dlyvscp, true),
-                                                new AstVarRef(nodep->fileline(), oldvscp, false));
+                        prep = new AstAssignPre(
+                            nodep->fileline(),
+                            new AstVarRef(nodep->fileline(), dlyvscp, VAccess::WRITE),
+                            new AstVarRef(nodep->fileline(), oldvscp, VAccess::READ));
                     }
                     AstNodeAssign* postp = new AstAssignPost(
-                        nodep->fileline(), new AstVarRef(nodep->fileline(), oldvscp, true),
-                        new AstVarRef(nodep->fileline(), dlyvscp, false));
+                        nodep->fileline(),
+                        new AstVarRef(nodep->fileline(), oldvscp, VAccess::WRITE),
+                        new AstVarRef(nodep->fileline(), dlyvscp, VAccess::READ));
                     postp->lhsp()->user2(true);  // Don't detect this assignment
                     oldvscp->user1p(dlyvscp);  // So we can find it later
                     // Make new ACTIVE with identical sensitivity tree
@@ -447,11 +455,11 @@ private:
                     newactp->addStmtsp(prep);  // Add to FRONT of statements
                     newactp->addStmtsp(postp);
                 }
-                AstVarRef* newrefp = new AstVarRef(nodep->fileline(), dlyvscp, true);
+                AstVarRef* newrefp = new AstVarRef(nodep->fileline(), dlyvscp, VAccess::WRITE);
                 newrefp->user2(true);  // No reason to do it again
                 nodep->replaceWith(newrefp);
                 VL_DO_DANGLING(nodep->deleteTree(), nodep);
-            } else if (!m_inDly && nodep->lvalue()) {
+            } else if (!m_inDly && nodep->access().isWriteOrRW()) {
                 // UINFO(9, "NBA " << nodep << endl);
                 if (!m_inInitial) {
                     UINFO(4, "AssignNDlyVar: " << nodep << endl);

src/V3Delayed.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Delayed {
+class V3Delayed final {
 public:
     static void delayedAll(AstNetlist* nodep);
 };

src/V3Depth.cpp

@@ -34,13 +34,13 @@
 
 //######################################################################
 
-class DepthVisitor : public AstNVisitor {
+class DepthVisitor final : public AstNVisitor {
 private:
     // NODE STATE
 
     // STATE
     AstNodeModule* m_modp = nullptr;  // Current module
-    AstCFunc* m_funcp = nullptr;  // Current block
+    AstCFunc* m_cfuncp = nullptr;  // Current block
     AstNode* m_stmtp = nullptr;  // Current statement
     int m_depth = 0;  // How deep in an expression
     int m_maxdepth = 0;  // Maximum depth in an expression
@@ -61,14 +61,14 @@ private:
                                   // bitmask instead of widths....)
                                   // See t_func_crc for an example test that requires this
                                   VFlagLogicPacked(), nodep->width());
-        UASSERT_OBJ(m_funcp, nodep, "Deep expression not under a function");
-        m_funcp->addInitsp(varp);
+        UASSERT_OBJ(m_cfuncp, nodep, "Deep expression not under a function");
+        m_cfuncp->addInitsp(varp);
         // Replace node tree with reference to var
-        AstVarRef* newp = new AstVarRef(nodep->fileline(), varp, false);
+        AstVarRef* newp = new AstVarRef(nodep->fileline(), varp, VAccess::READ);
         nodep->replaceWith(newp);
         // Put assignment before the referencing statement
-        AstAssign* assp = new AstAssign(nodep->fileline(),
-                                        new AstVarRef(nodep->fileline(), varp, true), nodep);
+        AstAssign* assp = new AstAssign(
+            nodep->fileline(), new AstVarRef(nodep->fileline(), varp, VAccess::WRITE), nodep);
         AstNRelinker linker2;
         m_stmtp->unlinkFrBack(&linker2);
         assp->addNext(m_stmtp);
@@ -81,23 +81,27 @@ private:
         VL_RESTORER(m_modp);
         {
             m_modp = nodep;
-            m_funcp = nullptr;
+            m_cfuncp = nullptr;
             iterateChildren(nodep);
         }
     }
     virtual void visit(AstCFunc* nodep) override {
-        m_funcp = nodep;
-        m_depth = 0;
-        m_maxdepth = 0;
-        iterateChildren(nodep);
-        m_funcp = nullptr;
+        VL_RESTORER(m_cfuncp);
+        {
+            m_cfuncp = nodep;
+            m_depth = 0;
+            m_maxdepth = 0;
+            iterateChildren(nodep);
+        }
     }
     void visitStmt(AstNodeStmt* nodep) {
-        m_depth = 0;
-        m_maxdepth = 0;
-        m_stmtp = nodep;
-        iterateChildren(nodep);
-        m_stmtp = nullptr;
+        VL_RESTORER(m_stmtp);
+        {
+            m_stmtp = nodep;
+            m_depth = 0;
+            m_maxdepth = 0;
+            iterateChildren(nodep);
+        }
     }
     virtual void visit(AstNodeStmt* nodep) override {
         if (!nodep->isStatement()) {
@@ -128,10 +132,10 @@ private:
     // Marking of non-static functions (because they might need "this")
     // (Here instead of new visitor after V3Descope just to avoid another visitor)
     void needNonStaticFunc(AstNode* nodep) {
-        UASSERT_OBJ(m_funcp, nodep, "Non-static accessor not under a function");
-        if (m_funcp->isStatic().trueUnknown()) {
+        UASSERT_OBJ(m_cfuncp, nodep, "Non-static accessor not under a function");
+        if (m_cfuncp->isStatic().trueUnknown()) {
             UINFO(5, "Mark non-public due to " << nodep << endl);
-            m_funcp->isStatic(false);
+            m_cfuncp->isStatic(false);
         }
     }
     virtual void visit(AstUCFunc* nodep) override {
@@ -151,7 +155,7 @@ private:
 public:
     // CONSTRUCTORS
     explicit DepthVisitor(AstNetlist* nodep) { iterate(nodep); }
-    virtual ~DepthVisitor() override {}
+    virtual ~DepthVisitor() override = default;
 };
 
 //######################################################################

src/V3Depth.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3Depth {
+class V3Depth final {
 public:
     static void depthAll(AstNetlist* nodep);
 };

src/V3DepthBlock.cpp

@@ -32,13 +32,13 @@
 
 //######################################################################
 
-class DepthBlockVisitor : public AstNVisitor {
+class DepthBlockVisitor final : public AstNVisitor {
 private:
     // NODE STATE
 
     // STATE
     AstNodeModule* m_modp = nullptr;  // Current module
-    AstCFunc* m_funcp = nullptr;  // Current function
+    AstCFunc* m_cfuncp = nullptr;  // Current function
     int m_depth = 0;  // How deep in an expression
     int m_deepNum = 0;  // How many functions made
 
@@ -49,11 +49,11 @@ private:
         AstNRelinker relinkHandle;
         nodep->unlinkFrBack(&relinkHandle);
         // Create function
-        string name = m_funcp->name() + "__deep" + cvtToStr(++m_deepNum);
+        string name = m_cfuncp->name() + "__deep" + cvtToStr(++m_deepNum);
         AstCFunc* funcp = new AstCFunc(nodep->fileline(), name, nullptr);
         funcp->argTypes(EmitCBaseVisitor::symClassVar());
         funcp->symProlog(true);
-        funcp->slow(m_funcp->slow());
+        funcp->slow(m_cfuncp->slow());
         funcp->addStmtsp(nodep);
         m_modp->addStmtp(funcp);
         // Call it at the point where the body was removed from
@@ -78,10 +78,10 @@ private:
     virtual void visit(AstCFunc* nodep) override {
         // We recurse into this.
         VL_RESTORER(m_depth);
-        VL_RESTORER(m_funcp);
+        VL_RESTORER(m_cfuncp);
         {
             m_depth = 0;
-            m_funcp = nodep;
+            m_cfuncp = nodep;
             iterateChildren(nodep);
         }
     }
@@ -117,7 +117,7 @@ private:
 public:
     // CONSTRUCTORS
     explicit DepthBlockVisitor(AstNetlist* nodep) { iterate(nodep); }
-    virtual ~DepthBlockVisitor() override {}
+    virtual ~DepthBlockVisitor() override = default;
 };
 
 //######################################################################

src/V3DepthBlock.h

@@ -25,7 +25,7 @@
 
 //============================================================================
 
-class V3DepthBlock {
+class V3DepthBlock final {
 public:
     static void depthBlockAll(AstNetlist* nodep);
 };