55e8d61391
With bytecode flushing and lazy feedback allocation, we need to call %PrepareForOptimization before we call %OptimizeFunctionOnNextCall Bug: v8:8801, v8:8394 Change-Id: I1f84477a8cef27b4cff61b54daf6fe1a9e5f8e76 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1591775 Commit-Queue: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Cr-Commit-Position: refs/heads/master@{#61148}
60 lines
1.3 KiB
JavaScript
60 lines
1.3 KiB
JavaScript
// Copyright 2017 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: --allow-natives-syntax
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(function modifyNext() {
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'use strict';
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class Point {
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constructor(x, y) {
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this.x = x;
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this.y = y;
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}
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}
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class ArgumentsPoint extends Point {
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constructor() {
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super(...arguments);
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}
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}
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var a = [];
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var ai = a[Symbol.iterator]();
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var original_next = ai.__proto__['next'];
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function testArgumentsPoint(x, y) {
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return new ArgumentsPoint(x, y);
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}
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%PrepareFunctionForOptimization(testArgumentsPoint);
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testArgumentsPoint(1, 2);
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testArgumentsPoint(1, 2);
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%OptimizeFunctionOnNextCall(testArgumentsPoint);
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var r = testArgumentsPoint(1, 2);
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assertInstanceof(r, ArgumentsPoint);
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assertInstanceof(r, Point);
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assertEquals(r.x, 1);
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assertEquals(r.y, 2);
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var called = 0;
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Object.defineProperty(ai.__proto__, 'next', {
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get: function() {
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called++;
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return original_next;
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}
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});
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var r2 = testArgumentsPoint(1, 2);
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// .next() is only loaded once during the iteration prologue (see
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// https://github.com/tc39/ecma262/pull/988/ and v8:6861)
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assertEquals(1, called);
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assertInstanceof(r2, ArgumentsPoint);
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assertInstanceof(r2, Point);
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assertEquals(r2.x, 1);
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assertEquals(r2.y, 2);
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})();
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