54 lines
1.6 KiB
JavaScript
54 lines
1.6 KiB
JavaScript
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// Copyright 2015 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 --harmony-concat-spreadable
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function arguments_with_length_getter(f) {
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arguments.__defineGetter__('length', f);
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return arguments;
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}
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var count = 0;
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function increment_count_return() { count++; return "boom"; }
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function increment_count_throw() { count++; throw "boom"; }
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// Do not read the length of an arguments object on the prototype chain of
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// an array.
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var a1 = [];
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%NormalizeElements(a1);
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a1.__proto__ = arguments_with_length_getter(increment_count_return);
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[].concat(a1);
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assertEquals(0, count);
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var a2 = [];
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%NormalizeElements(a2);
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a2.__proto__ = arguments_with_length_getter(increment_count_throw);
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[].concat(a2);
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assertEquals(0, count);
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// Do read the length of an arguments object if spreadable.
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var a3 = arguments_with_length_getter(increment_count_return);
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a3[Symbol.isConcatSpreadable] = true;
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[].concat(a3);
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assertEquals(1, count);
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var a4 = arguments_with_length_getter(increment_count_throw);
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a4[Symbol.isConcatSpreadable] = true;
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assertThrows(function() { [].concat(a4); });
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assertEquals(2, count);
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// Do read the length of an arguments object on the prototype chain of
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// an object.
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var a5 = {};
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a5.__proto__ = arguments_with_length_getter(increment_count_return);
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a5[Symbol.isConcatSpreadable] = true;
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[].concat(a5);
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assertEquals(3, count);
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var a6 = {};
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a6.__proto__ = arguments_with_length_getter(increment_count_throw);
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a6[Symbol.isConcatSpreadable] = true;
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assertThrows(function() { [].concat(a6); });
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assertEquals(4, count);
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