7826bfa789
- Don't read .constructor when returning a Promise from an async function. Instead, call out to the internals of Promise.resolve directly. This is done by adding back in an "optimization" from an earlier form of the async/await code written by Caitlin Potter. - Async functions always return a new Promise with a distinct identity, even if they simply return another Promise. R=caitp@igalia.com BUG=v8:4483 Review-Url: https://codereview.chromium.org/2219623002 Cr-Commit-Position: refs/heads/master@{#38404}
28 lines
564 B
JavaScript
28 lines
564 B
JavaScript
// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --harmony-async-await --allow-natives-syntax
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'use strict';
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var resolved = Promise.resolve();
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var count = 0;
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Object.defineProperty(Promise.prototype, 'constructor',
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{ get() { count++; return Promise; } })
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async function foo() {
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await resolved;
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return resolved;
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}
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async function bar() {
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throw 1;
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}
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foo();
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bar();
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%RunMicrotasks();
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assertEquals(0, count);
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