Internals: Remove V3LinkParse's need of class links. No functional change intended.

src/V3LinkDot.cpp

@@ -3066,6 +3066,9 @@ class LinkDotResolveVisitor final : public VNVisitor {
         VL_RESTORER(m_ds);
         VL_RESTORER(m_pinSymp);
 
+        if (nodep->name() == "std" && !nodep->classOrPackagep()) {
+            nodep->classOrPackagep(v3Global.rootp()->stdPackagep());
+        }
         // ClassRef's have pins, so track
         if (nodep->classOrPackagep()) {
             m_pinSymp = m_statep->getNodeSym(nodep->classOrPackagep());

src/V3LinkParse.cpp

@@ -45,7 +45,6 @@ class LinkParseVisitor final : public VNVisitor {
     using ImplTypedefMap = std::map<const std::pair<void*, std::string>, AstTypedef*>;
 
     // STATE
-    AstPackage* const m_stdPackagep;  // SystemVerilog std package
     AstVar* m_varp = nullptr;  // Variable we're under
     ImplTypedefMap m_implTypedef;  // Created typedefs for each <container,name>
     std::unordered_set<FileLine*> m_filelines;  // Filelines that have been seen
@@ -192,9 +191,7 @@ class LinkParseVisitor final : public VNVisitor {
                 if (!nodep->lifetime().isNone()) {
                     m_lifetime = nodep->lifetime();
                 } else {
-                    const AstClassOrPackageRef* const classPkgRefp
-                        = VN_AS(nodep->classOrPackagep(), ClassOrPackageRef);
-                    if (classPkgRefp && VN_IS(classPkgRefp->classOrPackageNodep(), Class)) {
+                    if (nodep->classMethod()) {
                         // Class methods are automatic by default
                         m_lifetime = VLifetime::AUTOMATIC;
                     } else if (nodep->dpiImport() || VN_IS(nodep, Property)) {
@@ -841,10 +838,8 @@ class LinkParseVisitor final : public VNVisitor {
             VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
         }
     }
-    void visit(AstClassOrPackageRef* nodep) override {
-        if (nodep->name() == "std" && !nodep->classOrPackagep()) {
-            nodep->classOrPackagep(m_stdPackagep);
-        }
+    void visit(AstClassOrPackageRef* nodep) override {  //
+        iterateChildren(nodep);
     }
     void visit(AstClocking* nodep) override {
         cleanFileline(nodep);
@@ -917,10 +912,7 @@ class LinkParseVisitor final : public VNVisitor {
 
 public:
     // CONSTRUCTORS
-    explicit LinkParseVisitor(AstNetlist* rootp)
-        : m_stdPackagep{rootp->stdPackagep()} {
-        iterate(rootp);
-    }
+    explicit LinkParseVisitor(AstNetlist* rootp) { iterate(rootp); }
     ~LinkParseVisitor() override {
         V3Stats::addStatSum(V3Stats::STAT_SOURCE_MODULES, m_statModules);
     }

src/verilog.y

@@ -4579,6 +4579,7 @@ taskId<nodeFTaskp>:
         |       packageClassScope id
                         { $$ = new AstTask{$<fl>$, *$2, nullptr};
                           $$->classOrPackagep($1);
+                          $$->classMethod(true);
                           SYMP->pushNewUnderNodeOrCurrent($$, $<scp>1); }
         ;
 
@@ -4620,6 +4621,7 @@ funcIdNew<nodeFTaskp>:          // IEEE: from class_constructor_declaration
                         { $$ = new AstFunc{$<fl>2, "new", nullptr, nullptr};
                           $$->classOrPackagep($1);
                           $$->isConstructor(true);
+                          $$->classMethod(true);
                           SYMP->pushNewUnderNodeOrCurrent($$, $<scp>1); }
         ;
 
@@ -4640,6 +4642,7 @@ fIdScoped<funcp>:               // IEEE: part of function_body_declaration/task_
                         { $<fl>$ = $<fl>1;
                           $<scp>$ = $<scp>1;
                           $$ = new AstFunc{$<fl>$, *$2, nullptr, nullptr};
+                          $$->classMethod(true);
                           $$->classOrPackagep($1); }
         ;
 

test_regress/t/t_class_ref_bad.out

@@ -0,0 +1,4 @@
+%Error: Internal Error: t/t_class_ref_bad.v:15:11: ../V3LinkDot.cpp:#: Bad package link
+   15 |       s = ClsRigh::m_s;   
+      |           ^~~~~~~
+                        ... See the manual at https://verilator.org/verilator_doc.html for more assistance.

test_regress/t/t_class_ref_bad.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2024 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
+
+import vltest_bootstrap
+
+test.scenarios('linter')
+
+test.lint(fails=True, expect_filename=test.golden_filename)
+
+test.passes()

test_regress/t/t_class_ref_bad.v

@@ -0,0 +1,17 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2024 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+class ClsRight;
+   string m_s;
+endclass
+
+module t (/*AUTOARG*/);
+   string s;
+   initial begin
+      // verilator lint_off PKGNODECL
+      s = ClsRigh::m_s;  // Bad typo
+   end
+endmodule