Fix randomize called within func/task (#6144) (#6753)

Co-authored-by: Udaya Raj Subedi <075bei047.udaya@pcampus.edu.np>

src/V3Width.cpp

@@ -6740,6 +6740,8 @@ class WidthVisitor final : public VNVisitor {
                 v3Global.rootp()->typeTablep()->addTypesp(adtypep);
                 withp = methodWithArgument(nodep, false, false, adtypep->findVoidDType(),
                                            adtypep->findBitDType(), adtypep);
+                for (const AstNode* argp = nodep->pinsp(); argp; argp = argp->nextp())
+                    userIterateAndNext(VN_AS(argp, Arg)->exprp(), WidthVP{SELF, BOTH}.p());
                 handleRandomizeArgs(nodep, classp);
             } else if (nodep->name() == "srandom") {
                 nodep->taskp(V3Randomize::newSRandomFunc(m_memberMap, classp));

test_regress/t/t_randomize_within_func.py

@@ -0,0 +1,21 @@
+#!/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')
+
+if not test.have_solver:
+    test.skip("No constraint solver installed")
+
+test.compile()
+
+test.execute()
+
+test.passes()

test_regress/t/t_randomize_within_func.v

@@ -0,0 +1,32 @@
+// DESCRIPTION: Verilator: Test for unsupported multiple global constraints
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2025 by PlanV GmbH.
+// SPDX-License-Identifier: CC0-1.0
+
+class Cls;
+  rand int m_1;
+  int m_2;
+  function void test_this_randomize;
+    int a;
+    a = randomize(m_2) with {m_2 > 2 && m_2 < 5;};
+    $display("%d: a=%0d %0d", `__LINE__, a, m_2);
+    if (a != 1) $stop;
+    // Problem 2 (Fixed): m_2 should be 3 or 4, but get out-of-range return
+    if (!(m_2 > 2 && m_2 < 5)) $stop;
+    // Problem 1 (Fixed): Got %Warning: /svaha/wsnyder/SandBox/homecvs/v4/verilator/include/verilated_random.cpp:417: Internal: Solver error: (error "line 9 column 27: invalid empty $
+    a = this.randomize() with {m_1 > 5 && m_1 < 10;};
+    $display("%d: a=%0d %0d", `__LINE__, a, m_1);
+    if (a != 1) $stop;
+    if (!(m_1 > 5 && m_1 < 10)) $stop;
+  endfunction
+endclass
+
+module t_randomize_within_func;
+  initial begin
+    Cls c = new;
+    c.test_this_randomize();
+
+    $write("*-* All Finished *-*\n");
+    $finish();
+  end
+endmodule