36 lines
863 B
JavaScript
36 lines
863 B
JavaScript
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// 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: --expose-gc
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var proxy = new Proxy([], {
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defineProperty() {
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w.length = 1; // shorten the array so the backstore pointer is relocated
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gc(); // force gc to move the array's elements backstore
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return Object.defineProperty.apply(this, arguments);
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}
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});
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class MyArray extends Array {
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// custom constructor which returns a proxy object
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static get[Symbol.species](){
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return function() {
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return proxy;
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}
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};
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}
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var w = new MyArray(100);
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w[1] = 0.1;
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w[2] = 0.1;
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var result = Array.prototype.concat.call(w);
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assertEquals(undefined, result[0]);
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assertEquals(0.1, result[1]);
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for (var i = 2; i < 200; i++) {
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assertEquals(undefined, result[i]);
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}
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