a class test

test_regress/t/t_multidriven_class0.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2025 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('simulator')
+
+test.compile(verilator_flags2=["--binary"])
+
+test.execute()
+
+test.passes()

test_regress/t/t_multidriven_class0.v

@@ -0,0 +1,72 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed into the Public Domain, for any use,
+// without warranty.
+// SPDX-License-Identifier: CC0-1.0
+
+// class task writes through ref argument (direct assignment + class task in same always_comb)
+
+// verilog_format: off
+`define stop $stop
+`define checkd(gotv,expv) do if ((gotv) !== (expv)) begin $write("%%Error: %s:%0d:  got=%0d exp=%0d (%s !== %s)\n", `__FILE__,`__LINE__, (gotv), (expv), `"gotv`", `"expv`"); `stop; end while(0);
+// verilog_format: on
+
+class C;
+  task automatic set1(ref logic q);
+    q = 1'b1;
+  endtask
+  task automatic set0(ref logic q);
+    q = 1'b0;
+  endtask
+endclass
+
+module mod #()(
+  input logic sel
+  ,output logic val
+);
+
+  logic l0;
+  C c;
+
+  initial c = new;
+
+  always_comb begin
+    l0 = 1'b0;
+    if (sel) begin
+      c.set1(l0);
+    end
+  end
+
+  assign val = l0;
+
+endmodule
+
+module m_tb#()();
+
+  logic sel, val;
+
+  mod m(
+    .sel(sel)
+    ,.val(val)
+  );
+
+  initial begin
+    #1;
+    sel = 'b0;
+    `checkd(val, 1'b0);
+    #1;
+    sel = 'b1;
+    `checkd(val, 1'b1);
+    #1;
+    sel = 'b0;
+    `checkd(val, 1'b0);
+    #1;
+  end
+
+  initial begin
+    #5;
+    $write("*-* All Finished *-*\n");
+    $finish;
+  end
+
+endmodule