1 files changed, 54 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/wasm/gc-js-interop-helpers.js b/deps/v8/test/mjsunit/wasm/gc-js-interop-helpers.js
new file mode 100644
index 0000000000..2047862d16
--- /dev/null
+++ b/deps/v8/test/mjsunit/wasm/gc-js-interop-helpers.js
@@ -0,0 +1,54 @@
+// Copyright 2022 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Helpers to test interoperability of Wasm objects in JavaScript.
+
+d8.file.execute('test/mjsunit/wasm/wasm-module-builder.js');
+
+function CreateWasmObjects() {
+  let builder = new WasmModuleBuilder();
+  builder.setSingletonRecGroups();
+  let struct_type = builder.addStruct([makeField(kWasmI32, true)]);
+  let array_type = builder.addArray(kWasmI32, true);
+  builder.addFunction('MakeStruct', makeSig([], [kWasmExternRef]))
+      .exportFunc()
+      .addBody([
+        kExprI32Const, 42,                       // --
+        kGCPrefix, kExprStructNew, struct_type,  // --
+        kGCPrefix, kExprExternExternalize        // --
+      ]);
+  builder.addFunction('MakeArray', makeSig([], [kWasmExternRef]))
+      .exportFunc()
+      .addBody([
+        kExprI32Const, 2,                             // length
+        kGCPrefix, kExprArrayNewDefault, array_type,  // --
+        kGCPrefix, kExprExternExternalize             // --
+      ]);
+
+  let instance = builder.instantiate();
+  return {
+    struct: instance.exports.MakeStruct(),
+    array: instance.exports.MakeArray(),
+  };
+}
+
+function testThrowsRepeated(fn, ErrorType) {
+  %PrepareFunctionForOptimization(fn);
+  for (let i = 0; i < 5; i++) assertThrows(fn, ErrorType);
+  %OptimizeFunctionOnNextCall(fn);
+  assertThrows(fn, ErrorType);
+  // TODO(7748): This assertion doesn't hold true, as some cases run into
+  // deopt loops.
+  // assertTrue(%ActiveTierIsTurbofan(fn));
+}
+
+function repeated(fn) {
+  %PrepareFunctionForOptimization(fn);
+  for (let i = 0; i < 5; i++) fn();
+  %OptimizeFunctionOnNextCall(fn);
+  fn();
+  // TODO(7748): This assertion doesn't hold true, as some cases run into
+  // deopt loops.
+  // assertTrue(%ActiveTierIsTurbofan(fn));
+}