Fix error text on packed struct init.

src/V3AstNodeDType.h

@@ -845,6 +845,7 @@ class AstMemberDType final : public AstNodeDType {
     // A member of a struct/union
     // PARENT: AstNodeUOrStructDType
     // @astgen op1 := childDTypep : Optional[AstNodeDType]
+    // @astgen op3 := valuep : Optional[AstNode]
 private:
     AstNodeDType* m_refDTypep = nullptr;  // Elements of this type (after widthing)
     string m_name;  // Name of variable
@@ -852,10 +853,12 @@ private:
     int m_lsb = -1;  // Within this level's packed struct, the LSB of the first bit of the member
     // UNSUP: int m_randType;    // Randomization type (IEEE)
 public:
-    AstMemberDType(FileLine* fl, const string& name, VFlagChildDType, AstNodeDType* dtp)
+    AstMemberDType(FileLine* fl, const string& name, VFlagChildDType, AstNodeDType* dtp,
+                   AstNode* valuep)
         : ASTGEN_SUPER_MemberDType(fl)
         , m_name{name} {
         childDTypep(dtp);  // Only for parser
+        this->valuep(valuep);
         dtypep(nullptr);  // V3Width will resolve
         refDTypep(nullptr);
     }

src/V3Width.cpp

@@ -2534,22 +2534,33 @@ private:
         nodep->repairMemberCache();
         nodep->dtypep(nodep);
         nodep->isFourstate(false);
+        // Error checks
+        for (AstMemberDType* itemp = nodep->membersp(); itemp;
+             itemp = VN_AS(itemp->nextp(), MemberDType)) {
+            AstNodeDType* const dtp = itemp->subDTypep()->skipRefp();
+            if (nodep->packed()
+                && !dtp->isIntegralOrPacked()
+                // Historically lax:
+                && !v3Global.opt.structsPacked())
+                itemp->v3error("Unpacked data type "
+                               << dtp->prettyDTypeNameQ()
+                               << " in packed struct/union (IEEE 1800-2017 7.2.1)");
+            if ((VN_IS(nodep, UnionDType) || nodep->packed()) && itemp->valuep()) {
+                itemp->v3error("Initial values not allowed in packed struct/union"
+                               " (IEEE 1800-2017 7.2.1)");
+                pushDeletep(itemp->valuep()->unlinkFrBack());
+            } else if (itemp->valuep()) {
+                itemp->valuep()->v3warn(E_UNSUPPORTED,
+                                        "Unsupported: Initial values in struct/union members");
+                pushDeletep(itemp->valuep()->unlinkFrBack());
+            }
+        }
         // Determine bit assignments and width
         if (VN_IS(nodep, UnionDType) || nodep->packed()) {
             int lsb = 0;
             int width = 0;
             // Report errors on first member first
             AstMemberDType* itemp;
-            for (itemp = nodep->membersp(); itemp; itemp = VN_AS(itemp->nextp(), MemberDType)) {
-                AstNodeDType* const dtp = itemp->subDTypep()->skipRefp();
-                if (nodep->packed()
-                    && !dtp->isIntegralOrPacked()
-                    // Historically lax:
-                    && !v3Global.opt.structsPacked())
-                    itemp->v3error("Unpacked data type "
-                                   << dtp->prettyDTypeNameQ()
-                                   << " in packed struct/union (IEEE 1800-2017 7.2.1)");
-            }
             // MSB is first, so loop backwards
             for (itemp = nodep->membersp(); itemp && itemp->nextp();
                  itemp = VN_AS(itemp->nextp(), MemberDType)) {}
@@ -2615,6 +2626,10 @@ private:
         nodep->refDTypep(iterateEditMoveDTypep(nodep, nodep->subDTypep()));
         nodep->dtypep(nodep);  // The member itself, not subDtype
         nodep->widthFromSub(nodep->subDTypep());
+        if (nodep->valuep()) {
+            userIterateAndNext(nodep->valuep(), WidthVP{nodep->dtypep(), PRELIM}.p());
+            iterateCheckAssign(nodep, "Initial value", nodep->valuep(), FINAL, nodep->dtypep());
+        }
     }
     void visit(AstStructSel* nodep) override {
         userIterateChildren(nodep, WidthVP{SELF, BOTH}.p());

src/verilog.y

@@ -2191,13 +2191,16 @@ member_decl_assignment<memberDTypep>:   // Derived from IEEE: variable_decl_assi
         //                      // So this is different from variable_decl_assignment
                 id variable_dimensionListE
                         { $$ = new AstMemberDType{$<fl>1, *$1, VFlagChildDType{},
-                                                  GRAMMARP->createArray(AstNodeDType::cloneTreeNull(GRAMMARP->m_memDTypep, true), $2, false)};
+                                                  GRAMMARP->createArray(AstNodeDType::cloneTreeNull(GRAMMARP->m_memDTypep, true), $2, false),
+                                                  nullptr};
                           PARSEP->tagNodep($$);
-                          }
+                        }
         |       id variable_dimensionListE '=' variable_declExpr
-                        { BBUNSUP($4, "Unsupported: Initial values in struct/union members.");
-                          // But still need error if packed according to IEEE 7.2.2
-                          $$ = nullptr; }
+                        { $$ = new AstMemberDType{$<fl>1, *$1, VFlagChildDType{},
+                                                  GRAMMARP->createArray(AstNodeDType::cloneTreeNull(GRAMMARP->m_memDTypep, true), $2, false),
+                                                  $4};
+                          PARSEP->tagNodep($$);
+                        }
         |       idSVKwd                                 { $$ = nullptr; }
         //
         //                      // IEEE: "dynamic_array_variable_identifier '[' ']' [ '=' dynamic_array_new ]"

test_regress/t/t_dist_warn_coverage.pl

@@ -26,7 +26,6 @@ foreach my $s (
     'Enum names without values only allowed on numeric types',  # Hard to hit
     'Enum ranges must be integral, per spec',  # Hard to hit
     'Return with return value isn\'t underneath a function',  # Hard to hit, get other bad return messages
-    'Select from non-array ',  # Instead get type does not have a bit range
     'Syntax error parsing real: \'',  # Instead can't lex the number
     'Unsupported: Ranges ignored in port-lists',  # Hard to hit
     'dynamic new() not expected in this context (expected under an assign)',  # Instead get syntax error
@@ -53,7 +52,6 @@ foreach my $s (
     'Exceeded limit of ',
     'Extern declaration\'s scope is not a defined class',
     'Format to $display-like function must have constant format string',
-    'Forward typedef used as class/package does not resolve to class/package: ',
     'Illegal +: or -: select; type already selected, or bad dimension: ',
     'Illegal bit or array select; type already selected, or bad dimension: ',
     'Illegal range select; type already selected, or bad dimension: ',

test_regress/t/t_struct_packed_init_bad.out

@@ -0,0 +1,5 @@
+%Error: t/t_struct_packed_init_bad.v:12:17: Initial values not allowed in packed struct/union (IEEE 1800-2017 7.2.1)
+                                          : ... In instance t
+   12 |       bit [3:0] m_lo = P;   
+      |                 ^~~~
+%Error: Exiting due to

test_regress/t/t_struct_packed_init_bad.pl

@@ -0,0 +1,21 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(linter => 1);
+
+lint(
+    fails => $Self->{vlt_all},
+    expect_filename => $Self->{golden_filename},
+    );
+
+#execute()
+
+ok(1);
+1;

test_regress/t/t_struct_packed_init_bad.v

@@ -0,0 +1,21 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2023 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t(/*AUTOARG*/);
+
+   parameter P = 4'h5;
+
+   struct packed {
+      bit [3:0] m_lo = P;  // Bad
+      bit [3:0] m_hi;
+   } s;
+
+   initial begin
+      $write("*-* All Finished *-*\n");
+      $finish;
+   end
+
+endmodule

test_regress/t/t_struct_unpacked_init.out

@@ -0,0 +1,6 @@
+%Error-UNSUPPORTED: t/t_struct_unpacked_init.v:12:24: Unsupported: Initial values in struct/union members
+                                                    : ... In instance t
+   12 |       bit [3:0] m_lo = P;
+      |                        ^
+                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
+%Error: Exiting due to

test_regress/t/t_struct_unpacked_init.pl

@@ -0,0 +1,19 @@
+#!/usr/bin/env perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(linter => 1);
+
+lint(
+    fails => 1,
+    expect_filename => $Self->{golden_filename},
+    );
+
+ok(1);
+1;

test_regress/t/t_struct_unpacked_init.v

@@ -0,0 +1,25 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2023 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+module t(/*AUTOARG*/);
+
+   parameter P = 4'h5;
+
+   struct {  // Can't legally be packed
+      bit [3:0] m_lo = P;
+      bit [3:0] m_hi;
+   } s;
+
+   initial begin
+      s.m_hi = 4'ha;
+      if (s.m_lo != 4'h5) $stop;
+      if (s.m_hi != 4'ha) $stop;
+
+      $write("*-* All Finished *-*\n");
+      $finish;
+   end
+
+endmodule