1 files changed, 46 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/wasm/export-identity.js b/deps/v8/test/mjsunit/wasm/export-identity.js
new file mode 100644
index 0000000000..2b9e9acc88
--- /dev/null
+++ b/deps/v8/test/mjsunit/wasm/export-identity.js
@@ -0,0 +1,46 @@
+// Copyright 2019 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.
+
+load("test/mjsunit/wasm/wasm-module-builder.js");
+
+function createExport(fun) {
+  let builder = new WasmModuleBuilder();
+  let fun_index = builder.addImport("m", "fun", kSig_i_v)
+  builder.addExport("fun", fun_index);
+  let instance = builder.instantiate({ m: { fun: fun }});
+  return instance.exports.fun;
+}
+
+// Test that re-exporting a generic JavaScript function changes identity, as
+// the resulting export is an instance of {WebAssembly.Function} instead.
+(function TestReExportOfJS() {
+  print(arguments.callee.name);
+  function fun() { return 7 }
+  let exported = createExport(fun);
+  assertNotSame(exported, fun);
+  assertEquals(7, exported());
+  assertEquals(7, fun());
+})();
+
+// Test that re-exporting and existing {WebAssembly.Function} that represents
+// regular WebAssembly functions preserves identity.
+(function TestReReExportOfWasm() {
+  print(arguments.callee.name);
+  let builder = new WasmModuleBuilder();
+  builder.addFunction('fun', kSig_i_v).addBody([kExprI32Const, 9]).exportFunc();
+  let fun = builder.instantiate().exports.fun;
+  let exported = createExport(fun);
+  assertSame(exported, fun);
+  assertEquals(9, fun());
+})();
+
+// Test that re-exporting and existing {WebAssembly.Function} that represents
+// generic JavaScript functions preserves identity.
+(function TestReReExportOfJS() {
+  print(arguments.callee.name);
+  let fun = createExport(() => 11)
+  let exported = createExport(fun);
+  assertSame(exported, fun);
+  assertEquals(11, fun());
+})();