Upload Kmake

deps/v8/test/mjsunit/regress/async-generator-is-awaiting.js

@@ -0,0 +1,43 @@
+// Copyright 2021 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.
+
+// Async generator builtins that suspend the generator set the is_awaiting bit
+// to 1 before awaiting. This is cleared when resumed. This tests that the bit
+// is set after the await operation successfully completes (i.e. returns the
+// Promise), since it can throw, and that thrown exception can be caught by
+// script. Otherwise the is_awaiting bit won't be cleared.
+
+// This makes `await new Promise(() => {})` throw.
+Object.defineProperty(Promise.prototype, 'constructor', {
+  get() { throw 42; }
+});
+
+// AsyncGeneratorAwait
+{
+  async function *f() {
+    try {
+      await new Promise(() => {});
+    } catch (e) {
+    }
+  }
+
+  f().next();
+}
+
+// AsyncGeneratorYield
+{
+  async function *f() {
+    try {
+      yield new Promise(() => {});
+    } catch (e) {
+    }
+  }
+
+  f().next();
+}
+
+// AsyncGeneratorReturn isn't affected because it's not possible, in script, to
+// catch an error thrown by a return resumption. It'll be caught by the
+// synthetic try-catch around the whole body of the async generator, which will
+// correctly reset the is_awaiting bit.