Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 1 | // Copyright 2016 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 | |
| 5 | // https://bugs.chromium.org/p/chromium/issues/detail?id=595319 |
| 6 | // Ensure exceptions are checked for by Array.prototype.concat from adding |
| 7 | // an element, and that elements are added to array subclasses appropriately |
| 8 | |
| 9 | // If adding a property does throw, the exception is propagated |
| 10 | class MyException extends Error { } |
| 11 | class NoDefinePropertyArray extends Array { |
| 12 | constructor(...args) { |
| 13 | super(...args); |
| 14 | return new Proxy(this, { |
| 15 | defineProperty() { throw new MyException(); } |
| 16 | }); |
| 17 | } |
| 18 | } |
| 19 | assertThrows(() => new NoDefinePropertyArray().concat([1]), MyException); |
| 20 | |
| 21 | // Ensure elements are added to the instance, rather than calling [[Set]]. |
| 22 | class ZeroGetterArray extends Array { get 0() {} }; |
| 23 | assertArrayEquals([1], new ZeroGetterArray().concat(1)); |
| 24 | |
| 25 | // Frozen arrays lead to throwing |
| 26 | |
| 27 | class FrozenArray extends Array { |
| 28 | constructor(...args) { super(...args); Object.freeze(this); } |
| 29 | } |
| 30 | assertThrows(() => new FrozenArray().concat([1]), TypeError); |
| 31 | |
| 32 | // Non-configurable non-writable zero leads to throwing |
| 33 | class ZeroFrozenArray extends Array { |
| 34 | constructor(...args) { |
| 35 | super(...args); |
| 36 | Object.defineProperty(this, 0, {value: 1}); |
| 37 | } |
| 38 | } |
| 39 | assertThrows(() => new ZeroFrozenArray().concat([1]), TypeError); |