OLD | NEW |
1 // Copyright 2009 the V8 project authors. All rights reserved. | 1 // Copyright 2009 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
(...skipping 20 matching lines...) Expand all Loading... |
31 // | 31 // |
32 // However, for compatibility with WebKit/JSC, we allow the overriding | 32 // However, for compatibility with WebKit/JSC, we allow the overriding |
33 // of read-only properties in prototype chains. | 33 // of read-only properties in prototype chains. |
34 | 34 |
35 function F() {}; | 35 function F() {}; |
36 F.prototype = Number; | 36 F.prototype = Number; |
37 | 37 |
38 var original_number_max = Number.MAX_VALUE; | 38 var original_number_max = Number.MAX_VALUE; |
39 | 39 |
40 // Assignment to a property which does not exist on the object itself, | 40 // Assignment to a property which does not exist on the object itself, |
41 // but is read-only in a prototype takes effect. | 41 // but is read-only in a prototype does not take effect. |
42 var f = new F(); | 42 var f = new F(); |
43 assertEquals(original_number_max, f.MAX_VALUE); | 43 assertEquals(original_number_max, f.MAX_VALUE); |
44 f.MAX_VALUE = 42; | 44 f.MAX_VALUE = 42; |
45 assertEquals(42, f.MAX_VALUE); | 45 assertEquals(original_number_max, f.MAX_VALUE); |
46 | 46 |
47 // Assignment to a property which does not exist on the object itself, | 47 // Assignment to a property which does not exist on the object itself, |
48 // but is read-only in a prototype takes effect. | 48 // but is read-only in a prototype does not take effect. |
49 f = new F(); | 49 f = new F(); |
50 with (f) { | 50 with (f) { |
51 MAX_VALUE = 42; | 51 MAX_VALUE = 42; |
52 } | 52 } |
53 assertEquals(42, f.MAX_VALUE); | 53 assertEquals(original_number_max, f.MAX_VALUE); |
54 | 54 |
55 // Assignment to read-only property on the object itself is ignored. | 55 // Assignment to read-only property on the object itself is ignored. |
56 Number.MAX_VALUE = 42; | 56 Number.MAX_VALUE = 42; |
57 assertEquals(original_number_max, Number.MAX_VALUE); | 57 assertEquals(original_number_max, Number.MAX_VALUE); |
58 | 58 |
59 // G should be read-only on the global object and the assignment is | 59 // G should be read-only on the global object and the assignment is |
60 // ignored. | 60 // ignored. |
61 (function G() { | 61 (function G() { |
62 eval("G = 42;"); | 62 eval("G = 42;"); |
63 assertTrue(typeof G === 'function'); | 63 assertTrue(typeof G === 'function'); |
64 })(); | 64 })(); |
OLD | NEW |