Fix std::randomize internal error on static member of different class (#7498) (#7499)

Fixes #7498.

docs/CONTRIBUTORS

@@ -88,6 +88,7 @@ Gökçe Aydos
 Han Qi
 Harald Heckmann
 Hennadii Chernyshchyk
+hjsanjana
 Howard Su
 Huang Rui
 Huanghuang Zhou

src/V3Randomize.cpp

@@ -2824,6 +2824,11 @@ class CaptureVisitor final : public VNVisitor {
             && varRefp->varp()->lifetime().isStatic())
             return CaptureMode::CAP_NO;
         if (callerIsClass && varIsFieldOfCaller) return CaptureMode::CAP_THIS;
+        // Static member of a different class: V3Width replaces AstMemberSel with a bare
+        // AstVarRef (classOrPackagep set). Capture current value as a function argument.
+        if (callerIsClass && varClassp && !varIsFieldOfCaller
+            && varRefp->varp()->lifetime().isStatic())
+            return CaptureMode::CAP_VALUE;
         UASSERT_OBJ(!callerIsClass, varRefp, "Invalid reference?");
         return CaptureMode::CAP_VALUE;
     }

test_regress/t/t_std_randomize_static_member.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# 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-FileCopyrightText: 2026 Wilson Snyder
+# 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_std_randomize_static_member.v

@@ -0,0 +1,80 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain
+// SPDX-FileCopyrightText: 2026 Antmicro
+// SPDX-License-Identifier: CC0-1.0
+
+// Regression test for GitHub issue #7498:
+// std::randomize() constraint referencing a static class member of a
+// *different* class (accessed via a foreach loop) caused an internal error
+// in V3Randomize ("Invalid reference?").
+
+package tlogy_m_pkg;
+class v_cfg;
+  static int num_of_ds = 0;
+endclass
+
+class tlogy_m;
+  v_cfg v[$];
+endclass
+endpackage
+
+package s_pkg;
+import tlogy_m_pkg::*;
+class s_cfg;
+  tlogy_m t_m;
+  bit t_mode;
+  int a_d_idx;
+
+  function void setup_h_iw_cfg();
+    if (t_mode) begin
+      foreach (t_m.v[i]) begin
+        if (std::randomize(a_d_idx) with {
+               if (t_m.v[i].num_of_ds > 1) {
+                 a_d_idx inside {[0:(t_m.v[i].num_of_ds - 1)]};
+                 a_d_idx != 0;
+               }
+             } == 0)
+          $stop;
+      end
+    end
+  endfunction
+endclass
+endpackage
+
+module t;
+  import tlogy_m_pkg::*;
+  import s_pkg::*;
+
+  initial begin
+    automatic s_cfg cfg = new;
+    automatic tlogy_m tm = new;
+    automatic v_cfg vc0 = new;
+    automatic v_cfg vc1 = new;
+
+    // Set up: push two entries in the queue and set num_of_ds = 3
+    // so the constraint branch (num_of_ds > 1) is exercised.
+    tm.v.push_back(vc0);
+    tm.v.push_back(vc1);
+    v_cfg::num_of_ds = 3;
+
+    cfg.t_m = tm;
+    cfg.t_mode = 1'b1;
+
+    repeat (20) begin
+      cfg.setup_h_iw_cfg();
+      // When num_of_ds = 3 the constraint is:
+      //   a_d_idx inside {[0:2]} && a_d_idx != 0
+      // so a_d_idx must be 1 or 2.
+      if (cfg.a_d_idx < 1 || cfg.a_d_idx > 2) $stop;
+    end
+
+    // Also verify that the "no constraint" branch (num_of_ds <= 1)
+    // compiles and runs without crashing.
+    v_cfg::num_of_ds = 0;
+    cfg.setup_h_iw_cfg();
+
+    $write("*-* All Finished *-*\n");
+    $finish;
+  end
+endmodule