Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2014 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 | // Flags: --allow-natives-syntax |
| 6 | 'use strict'; |
| 7 | |
| 8 | (function TestMaps() { |
| 9 | class Base {} |
| 10 | class Derived extends Base {} |
| 11 | |
| 12 | let d1 = new Derived(); |
| 13 | let d2 = new Derived(); |
| 14 | |
| 15 | assertTrue(%HaveSameMap(d1, d2)); |
| 16 | }()); |
| 17 | |
| 18 | |
| 19 | (function TestProtoModificationArray() { |
| 20 | let called = 0; |
| 21 | function F() { |
| 22 | called++; |
| 23 | assertFalse(Array.isArray(this)); |
| 24 | } |
| 25 | class Derived extends Array {} |
| 26 | assertSame(Derived.__proto__, Array); |
| 27 | |
| 28 | let d1 = new Derived(); |
| 29 | assertTrue(Array.isArray(d1)); |
| 30 | |
| 31 | Derived.__proto__ = F; |
| 32 | called = 0; |
| 33 | let d2 = new Derived(); |
| 34 | assertSame(1, called); |
| 35 | assertFalse(Array.isArray(d2)); |
| 36 | |
| 37 | assertFalse(%HaveSameMap(d1, d2)); |
| 38 | }()); |
| 39 | |
| 40 | |
| 41 | (function TestProtoModification() { |
| 42 | let called = 0; |
| 43 | function F() { |
| 44 | called++; |
| 45 | let exn = null; |
| 46 | try { |
| 47 | this.byteLength; |
| 48 | } catch (e) { |
| 49 | exn = e; |
| 50 | } |
| 51 | assertTrue(exn instanceof TypeError); |
| 52 | } |
| 53 | class Derived extends Uint8Array { |
| 54 | constructor() { super(10); } |
| 55 | } |
| 56 | assertSame(Derived.__proto__, Uint8Array); |
| 57 | |
| 58 | let d1 = new Derived(); |
| 59 | assertSame(10, d1.byteLength); |
| 60 | |
| 61 | Derived.__proto__ = F; |
| 62 | called = 0; |
| 63 | let d2 = new Derived(); |
| 64 | assertSame(1, called); |
| 65 | assertThrows(function() { d2.byteLength; }, TypeError); |
| 66 | |
| 67 | assertFalse(%HaveSameMap(d1, d2)); |
| 68 | }()); |