Fix dpi export pointers (#7742) (#7751)

Fixes #7742.

docs/CONTRIBUTORS

@@ -325,3 +325,4 @@ Yogish Sekhar
 24bit-xjkp
 Zubin Jain
 Muzaffer Kal
+Yilin Li

src/V3EmitCFunc.h

@@ -573,8 +573,14 @@ public:
                      + "\", " + std::to_string(nodep->fileline()->lineno()) + ")->"),
                     memberVarp, resetp->constructing());
             } else {
-                AstVar* const varp = VN_AS(fromp, NodeVarRef)->varp();
-                emitVarReset("", varp, resetp->constructing());
+                AstNodeVarRef* const fromVarRefp = VN_AS(fromp, NodeVarRef);
+                AstVar* const varp = fromVarRefp->varp();
+                const string prefix
+                    = fromVarRefp->selfPointer().isEmpty()
+                          ? ""
+                          : dereferenceString(
+                                VN_AS(fromp, NodeVarRef)->selfPointerProtect(m_useSelfForThis));
+                emitVarReset(prefix, varp, resetp->constructing());
             }
             return;
         }

test_regress/t/t_dpi_export_unpack.py

@@ -0,0 +1,20 @@
+#!/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: 2024 Wilson Snyder
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+# 9-Jun-2026: Modifications for this test contributed by Yilin Li.
+
+import vltest_bootstrap
+
+test.scenarios('simulator')
+
+test.compile(verilator_flags2=["--binary"])
+
+test.execute()
+
+test.passes()

test_regress/t/t_dpi_export_unpack.v

@@ -0,0 +1,33 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// 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: 2020 Wilson Snyder
+// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+// 9-Jun-2026: Modifications for this test contributed by Yilin Li.
+
+export "DPI-C" task readHEX;
+export "DPI-C" task loadHEX;
+
+task readHEX;
+  input string file;
+  output logic [7:0] stimuli[32'h00010000];
+  $readmemh(file, stimuli);
+endtask
+
+task loadHEX;
+  input string file;
+  logic [7:0] stimuli[32'h00010000];
+  readHEX(file, stimuli);
+endtask
+
+module tb ();
+
+  logic [7:0] result[32'h00010000];
+  initial begin
+    loadHEX("dummy");
+  end
+
+endmodule