Add error on calling static function without object (#4962).

Changes

@@ -20,6 +20,7 @@ Verilator 5.023 devel
 **Minor:**
 
 * Add DFG 'regularize' pass, and improve variable removal (#4937). [Geza Lore]
+* Add error on calling static function without object (#4962).
 * Support public packed struct / union (#860) (#4878). [Kefa Chen]
 * Change installation to be relocatable (#4927). [Geza Lore]
 * Fix __Vlip undefined error in --freloop (#4824). [Justin Yao Du]

src/V3Width.cpp

@@ -5793,6 +5793,12 @@ class WidthVisitor final : public VNVisitor {
         }
         UASSERT_OBJ(nodep->taskp(), nodep, "Unlinked");
         if (nodep->didWidth()) return;
+        if ((nodep->taskp()->classMethod() && !nodep->taskp()->isStatic())
+            && !VN_IS(m_procedurep, InitialAutomatic)
+            && (!m_ftaskp || !m_ftaskp->classMethod() || m_ftaskp->isStatic())) {
+            nodep->v3error("Cannot call non-static member function "
+                           << nodep->prettyNameQ() << " without object (IEEE 1800-2023 8.10)");
+        }
         userIterate(nodep->taskp(), nullptr);
         // And do the arguments to the task/function too
         processFTaskRefArgs(nodep);

test_regress/t/t_class_member_bad3.out

@@ -1,7 +0,0 @@
-%Error: t/t_class_member_bad3.v:16:12: Static access to non-static member variable 'member'
-   16 |       Foo::member = 1;
-      |            ^~~~~~
-%Error: t/t_class_member_bad3.v:17:12: Static access to non-static task/function 'method'
-   17 |       Foo::method();
-      |            ^~~~~~
-%Error: Exiting due to

test_regress/t/t_class_member_bad3.v

@@ -1,19 +0,0 @@
-// DESCRIPTION: Verilator: Verilog Test module
-//
-// This file ONLY is placed under the Creative Commons Public Domain, for
-// any use, without warranty, 2023 by Antmicro Ltd.
-// SPDX-License-Identifier: CC0-1.0
-
-class Foo;
-   int member;
-
-   task method; endtask
-endclass
-
-module t;
-   initial begin
-      Foo foo = new;
-      Foo::member = 1;
-      Foo::method();
-   end
-endmodule

test_regress/t/t_class_misstatic_bad.out

@@ -0,0 +1,13 @@
+%Error: t/t_class_misstatic_bad.v:31:7: Cannot call non-static member function 'nonstatic' without object (IEEE 1800-2023 8.10)
+                                      : ... note: In instance 't'
+   31 |       nonstatic();   
+      |       ^~~~~~~~~
+%Error: t/t_class_misstatic_bad.v:38:12: Cannot call non-static member function 'nonstatic' without object (IEEE 1800-2023 8.10)
+                                       : ... note: In instance 't'
+   38 |       Cls::nonstatic();   
+      |            ^~~~~~~~~
+%Error: t/t_class_misstatic_bad.v:44:12: Cannot call non-static member function 'nonstatic' without object (IEEE 1800-2023 8.10)
+                                       : ... note: In instance 't'
+   44 |       Cls::nonstatic();   
+      |            ^~~~~~~~~
+%Error: Exiting due to

test_regress/t/t_class_misstatic_bad.pl

@@ -2,7 +2,7 @@
 if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
 # DESCRIPTION: Verilator: Verilog Test driver/expect definition
 #
-# Copyright 2023 by Wilson Snyder. This program is free software; you
+# Copyright 2010 by Wilson Snyder. This program is free software; you
 # can redistribute it and/or modify it under the terms of either the GNU
 # Lesser General Public License Version 3 or the Perl Artistic License
 # Version 2.0.
@@ -11,8 +11,8 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 scenarios(linter => 1);
 
 lint(
-    # fails => 1,  # TODO bug4077
-    # expect_filename => $Self->{golden_filename},
+    fails => 1,
+    expect_filename => $Self->{golden_filename},
     );
 
 ok(1);

test_regress/t/t_class_misstatic_bad.v

@@ -0,0 +1,49 @@
+// 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 Cls;
+   int m_field = get_ok();
+   function int get_ok();
+      return 1;
+   endfunction
+   function void nonstatic();
+   endfunction
+   static function void isst();
+   endfunction
+endclass
+
+class Bar;
+   function void bar();
+      Cls::nonstatic();  // <--- bad static ref
+      Cls::isst();
+   endfunction
+endclass
+
+class Extends extends Cls;
+   function void ok();
+      nonstatic();
+      isst();
+   endfunction
+   static function extstatic();
+      nonstatic();  // <--- bad static ref
+      isst();
+   endfunction
+endclass
+
+module t;
+   function nonclassfunc();
+      Cls::nonstatic();  // <--- bad static ref
+      Cls::isst();
+   endfunction
+   initial begin
+      Bar obj = new();
+      obj.bar();
+      Cls::nonstatic();  // <--- bad static ref
+      Cls::isst();
+      Extends::isst();
+      $stop;
+   end
+endmodule