37 lines
969 B
JavaScript
37 lines
969 B
JavaScript
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// 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: --expose-gc
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array = new Array(10);
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array[0] = 0.1;
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// array[1] = THE_HOLE, reading through the prototype chain
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array[2] = 2.1;
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array[3] = 3.1;
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var copy = array.slice(0, array.length);
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// Change the array's prototype.
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var proto = {};
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array.__proto__ = proto;
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// Define [1] on the prototype to alter the array during concatenation.
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Object.defineProperty(
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proto, 1, {
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get() {
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// Alter the array.
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array.length = 1;
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// Force gc to move the array.
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gc();
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return "value from proto";
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},
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set(new_value) { }
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});
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var concatted_array = Array.prototype.concat.call(array);
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assertEquals(concatted_array[0], 0.1);
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assertEquals(concatted_array[1], "value from proto");
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assertEquals(concatted_array[2], undefined);
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assertEquals(concatted_array[3], undefined);
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