[dart2wasm] Fix static tear-off vtable instantiation.

When dynamic modules are enabled vtables should only include the dynamic call entry point.

Change-Id: Ifdf935a00039fe478c290d4bef585659cfdb9661
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/427860
Reviewed-by: Martin Kustermann <[email protected]>
Commit-Queue: Nate Biggs <[email protected]>

Author: natebiggs

pkg/dart2wasm/lib/constants.dart

@@ -1129,6 +1129,13 @@ class ConstantCreator extends ConstantVisitor<ConstantInfo?>
       void makeVtable() {
         declareAndAddRefFunc(dynamicCallEntry);
         assert(!instantiationOfTearOffRepresentation.isGeneric);
+
+        if (translator.dynamicModuleSupportEnabled) {
+          // Dynamic modules only use the dynamic call entry.
+          b.struct_new(instantiationOfTearOffRepresentation.vtableStruct);
+          return;
+        }
+
         for (int posArgCount = 0;
             posArgCount <= positionalCount;
             posArgCount++) {

pkg/dynamic_modules/test/data/generic_static_tearoff/dynamic_interface.yaml

@@ -0,0 +1,3 @@
+# Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.

pkg/dynamic_modules/test/data/generic_static_tearoff/main.dart

@@ -0,0 +1,12 @@
+// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import '../../common/testing.dart' as helper;
+import 'package:expect/expect.dart';
+
+void main() async {
+  final f = await helper.load('entry1.dart') as int Function(int);
+  Expect.equals(3, f(3));
+  helper.done();
+}

pkg/dynamic_modules/test/data/generic_static_tearoff/modules/entry1.dart

@@ -0,0 +1,14 @@
+// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+T tearImpl<T>(T value) {
+  return value;
+}
+
+int Function(int) tear = tearImpl<int>;
+
+@pragma('dyn-module:entry-point')
+dynamic dynamicModuleEntrypoint() {
+  return tear;
+}