11359e331a
-- Moves promiseHasHandlerSymbol to inobject property -- Ports PromiseResolveClosure to TF -- Fix a non spec async-await test which fails now because we do a map check for native promise check (instead of IsPromise). Changing the constructor (in the test) invalidates the map check. This patch results in a 7.1% performance improvement in the bluebird benchmark (over 5 runs). BUG=v8:5343 Review-Url: https://codereview.chromium.org/2541283002 Cr-Commit-Position: refs/heads/master@{#41569}
102 lines
2.8 KiB
JavaScript
102 lines
2.8 KiB
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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function assertEqualsAsync(expected, run, msg) {
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var actual;
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var hadValue = false;
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var hadError = false;
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var promise = run();
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if (typeof promise !== "object" || typeof promise.then !== "function") {
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throw new MjsUnitAssertionError(
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"Expected " + run.toString() +
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" to return a Promise, but it returned " + PrettyPrint(promise));
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}
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promise.then(function(value) { hadValue = true; actual = value; },
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function(error) { hadError = true; actual = error; });
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assertFalse(hadValue || hadError);
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%RunMicrotasks();
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if (hadError) throw actual;
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assertTrue(
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hadValue, "Expected '" + run.toString() + "' to produce a value");
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assertEquals(expected, actual, msg);
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};
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// Rename a function so that it can help omit things from stack trace.
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function test(fn) {
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return Object.defineProperty(fn, "name", {
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enumerable: false,
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configurable: true,
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value: "@" + fn.name,
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writable: false
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});
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}
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function getStack(error) {
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var stack = error.stack.split('\n').
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filter(function(line) {
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return /^\s*at @?[a-zA-Z0-9_]/.test(line);
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}).
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map(line => line.replace(/^\s*at (@?[a-zA-Z0-9_\.\[\]]+)(.*)/, "$1"));
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// remove `Promise.then()` invocation by assertEqualsAsync()
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if (stack[1] === "assertEqualsAsync") return [];
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return stack.reverse();
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}
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var log = [];
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class FakePromise extends Promise {
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constructor(executor) {
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var stack = getStack(new Error("Getting Callstack"));
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if (stack.length) {
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var first = -1;
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for (var i = 0; i < stack.length; ++i) {
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if (stack[i][0] === '@') {
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first = i;
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break;
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}
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}
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while (first > 0) stack.shift(), --first;
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if (stack.length) {
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log.push("@@Species: [" + stack.join(" > ") + "]");
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}
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}
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return new Promise(executor);
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}
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};
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Object.defineProperty(Promise, Symbol.species, {
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value: FakePromise,
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configurable: true,
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enumerable: false,
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writable: false
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});
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// Internal `AsyncFunctionAwait` only --- no @@species invocations.
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async function asyncFn() { return await "foo"; }
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assertEqualsAsync("foo", test(function testInternalOnly() { return asyncFn(); },
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"should not call Promise[@@Species]"));
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assertEquals([], log);
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log.length = 0;
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assertEqualsAsync(
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"foo",
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test(function testThenOnReturnedPromise() {
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return asyncFn().then(x => (log.push("Then: " + x), x));
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}),
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"should call Promise[@@Species] after non-internal Then");
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assertEquals([
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"@@Species: [@testThenOnReturnedPromise > FakePromise]",
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"Then: foo"
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], log);
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