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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 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 |
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42 // The following const declarations are shared with other native JS files. | 42 // The following const declarations are shared with other native JS files. |
43 // They are all declared at this one spot to avoid const redeclaration errors. | 43 // They are all declared at this one spot to avoid const redeclaration errors. |
44 const $Object = global.Object; | 44 const $Object = global.Object; |
45 const $Array = global.Array; | 45 const $Array = global.Array; |
46 const $String = global.String; | 46 const $String = global.String; |
47 const $Number = global.Number; | 47 const $Number = global.Number; |
48 const $Function = global.Function; | 48 const $Function = global.Function; |
49 const $Boolean = global.Boolean; | 49 const $Boolean = global.Boolean; |
50 const $NaN = 0/0; | 50 const $NaN = 0/0; |
51 | 51 |
52 | 52 // ECMA-262 Section 11.9.3. |
53 // ECMA-262, section 11.9.1, page 55. | |
54 function EQUALS(y) { | 53 function EQUALS(y) { |
55 if (IS_STRING(this) && IS_STRING(y)) return %StringEquals(this, y); | 54 if (IS_STRING(this) && IS_STRING(y)) return %StringEquals(this, y); |
56 var x = this; | 55 var x = this; |
57 | 56 |
58 // NOTE: We use iteration instead of recursion, because it is | |
59 // difficult to call EQUALS with the correct setting of 'this' in | |
60 // an efficient way. | |
61 while (true) { | 57 while (true) { |
62 if (IS_NUMBER(x)) { | 58 if (IS_NUMBER(x)) { |
63 if (y == null) return 1; // not equal | 59 while (true) { |
64 return %NumberEquals(x, %ToNumber(y)); | 60 if (IS_NUMBER(y)) return %NumberEquals(x, y); |
| 61 if (IS_NULL_OR_UNDEFINED(y)) return 1; // not equal |
| 62 if (!IS_SPEC_OBJECT(y)) { |
| 63 // String or boolean. |
| 64 return %NumberEquals(x, %ToNumber(y)); |
| 65 } |
| 66 y = %ToPrimitive(y, NO_HINT); |
| 67 } |
65 } else if (IS_STRING(x)) { | 68 } else if (IS_STRING(x)) { |
66 if (IS_STRING(y)) return %StringEquals(x, y); | 69 while (true) { |
| 70 if (IS_STRING(y)) return %StringEquals(x, y); |
| 71 if (IS_NUMBER(y)) return %NumberEquals(%ToNumber(x), y); |
| 72 if (IS_BOOLEAN(y)) return %NumberEquals(%ToNumber(x), %ToNumber(y)); |
| 73 if (IS_NULL_OR_UNDEFINED(y)) return 1; // not equal |
| 74 y = %ToPrimitive(y, NO_HINT); |
| 75 } |
| 76 } else if (IS_BOOLEAN(x)) { |
| 77 if (IS_BOOLEAN(y)) return %_ObjectEquals(x, y) ? 0 : 1; |
| 78 if (IS_NULL_OR_UNDEFINED(y)) return 1; |
67 if (IS_NUMBER(y)) return %NumberEquals(%ToNumber(x), y); | 79 if (IS_NUMBER(y)) return %NumberEquals(%ToNumber(x), y); |
68 if (IS_BOOLEAN(y)) return %NumberEquals(%ToNumber(x), %ToNumber(y)); | 80 if (IS_STRING(y)) return %NumberEquals(%ToNumber(x), %ToNumber(y)); |
69 if (y == null) return 1; // not equal | 81 // y is object. |
| 82 x = %ToNumber(x); |
70 y = %ToPrimitive(y, NO_HINT); | 83 y = %ToPrimitive(y, NO_HINT); |
71 } else if (IS_BOOLEAN(x)) { | 84 } else if (IS_NULL_OR_UNDEFINED(x)) { |
72 if (IS_BOOLEAN(y)) { | 85 return IS_NULL_OR_UNDEFINED(y) ? 0 : 1; |
73 return %_ObjectEquals(x, y) ? 0 : 1; | |
74 } | |
75 if (y == null) return 1; // not equal | |
76 return %NumberEquals(%ToNumber(x), %ToNumber(y)); | |
77 } else if (x == null) { | |
78 // NOTE: This checks for both null and undefined. | |
79 return (y == null) ? 0 : 1; | |
80 } else { | 86 } else { |
81 // x is not a number, boolean, null or undefined. | 87 // x is an object. |
82 if (y == null) return 1; // not equal | |
83 if (IS_SPEC_OBJECT(y)) { | 88 if (IS_SPEC_OBJECT(y)) { |
84 return %_ObjectEquals(x, y) ? 0 : 1; | 89 return %_ObjectEquals(x, y) ? 0 : 1; |
85 } | 90 } |
86 | 91 if (IS_NULL_OR_UNDEFINED(y)) return 1; // not equal |
| 92 if (IS_BOOLEAN(y)) y = %ToNumber(y); |
87 x = %ToPrimitive(x, NO_HINT); | 93 x = %ToPrimitive(x, NO_HINT); |
88 } | 94 } |
89 } | 95 } |
90 } | 96 } |
91 | 97 |
92 // ECMA-262, section 11.9.4, page 56. | 98 // ECMA-262, section 11.9.4, page 56. |
93 function STRICT_EQUALS(x) { | 99 function STRICT_EQUALS(x) { |
94 if (IS_STRING(this)) { | 100 if (IS_STRING(this)) { |
95 if (!IS_STRING(x)) return 1; // not equal | 101 if (!IS_STRING(x)) return 1; // not equal |
96 return %StringEquals(this, x); | 102 return %StringEquals(this, x); |
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634 throw %MakeTypeError('cannot_convert_to_primitive', []); | 640 throw %MakeTypeError('cannot_convert_to_primitive', []); |
635 } | 641 } |
636 | 642 |
637 | 643 |
638 // NOTE: Setting the prototype for Array must take place as early as | 644 // NOTE: Setting the prototype for Array must take place as early as |
639 // possible due to code generation for array literals. When | 645 // possible due to code generation for array literals. When |
640 // generating code for a array literal a boilerplate array is created | 646 // generating code for a array literal a boilerplate array is created |
641 // that is cloned when running the code. It is essiential that the | 647 // that is cloned when running the code. It is essiential that the |
642 // boilerplate gets the right prototype. | 648 // boilerplate gets the right prototype. |
643 %FunctionSetPrototype($Array, new $Array(0)); | 649 %FunctionSetPrototype($Array, new $Array(0)); |
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