Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5 | // ArrayBuffer.prototype.slice makes subclass and checks length |
| 6 | |
| 7 | class MyArrayBuffer extends ArrayBuffer { } |
| 8 | assertEquals(MyArrayBuffer, new MyArrayBuffer(0).slice().constructor); |
| 9 | |
| 10 | class MyShortArrayBuffer extends ArrayBuffer { |
| 11 | constructor(length) { super(length - 1); } |
| 12 | } |
| 13 | assertThrows(() => new MyShortArrayBuffer(5).slice(0, 4), TypeError); |
| 14 | |
| 15 | class SingletonArrayBuffer extends ArrayBuffer { |
| 16 | constructor(...args) { |
| 17 | if (SingletonArrayBuffer.cached) return SingletonArrayBuffer.cached; |
| 18 | super(...args); |
| 19 | SingletonArrayBuffer.cached = this; |
| 20 | } |
| 21 | } |
| 22 | assertThrows(() => new SingletonArrayBuffer(5).slice(0, 4), TypeError); |
| 23 | |
| 24 | class NonArrayBuffer extends ArrayBuffer { |
| 25 | constructor() { |
| 26 | return {}; |
| 27 | } |
| 28 | } |
| 29 | assertThrows(() => new NonArrayBuffer(5).slice(0, 4), TypeError); |
| 30 | |
| 31 | // Species fallback is ArrayBuffer |
| 32 | class UndefinedArrayBuffer extends ArrayBuffer { } |
| 33 | UndefinedArrayBuffer.prototype.constructor = undefined; |
| 34 | assertEquals(ArrayBuffer, new UndefinedArrayBuffer(0).slice().constructor); |