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6ca81ad72a
PR-URL: https://github.com/nodejs/node/pull/30020 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
49 lines
1.2 KiB
JavaScript
49 lines
1.2 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 Baseline() {
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let array = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
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let it = array[Symbol.iterator]();
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assertEquals(0, it.next().value);
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assertEquals(1, it.next().value);
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assertEquals(2, it.next().value);
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%ArrayBufferDetach(array.buffer);
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it.next();
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};
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%NeverOptimizeFunction(Baseline);
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assertThrows(Baseline, TypeError,
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"Cannot perform Array Iterator.prototype.next on a detached ArrayBuffer");
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function Turbo(count = 10000) {
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let array = Array(10000);
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for (let i = 0; i < 10000; ++i) {
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array[i] = 254;
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}
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array[5000] = 255;
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array = new Uint8Array(array);
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let sum = 0;
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let it = array[Symbol.iterator]();
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for (let i = 0; i < count; ++i) {
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let result = it.next();
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if (result.value === 255) {
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%ArrayBufferDetach(array.buffer);
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}
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sum += result.value;
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}
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return sum;
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}
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%PrepareFunctionForOptimization(Turbo);
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Turbo(10);
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Turbo(10);
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%OptimizeFunctionOnNextCall(Turbo);
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assertThrows(Turbo, TypeError,
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"Cannot perform Array Iterator.prototype.next on a detached ArrayBuffer");
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