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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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107 // If anything else gets here, we just do simple identity check. | 107 // If anything else gets here, we just do simple identity check. |
108 // Objects (including functions), null, undefined and booleans were | 108 // Objects (including functions), null, undefined and booleans were |
109 // checked in the CompareStub, so there should be nothing left. | 109 // checked in the CompareStub, so there should be nothing left. |
110 return %_ObjectEquals(this, x) ? 0 : 1; | 110 return %_ObjectEquals(this, x) ? 0 : 1; |
111 } | 111 } |
112 | 112 |
113 | 113 |
114 // ECMA-262, section 11.8.5, page 53. The 'ncr' parameter is used as | 114 // ECMA-262, section 11.8.5, page 53. The 'ncr' parameter is used as |
115 // the result when either (or both) the operands are NaN. | 115 // the result when either (or both) the operands are NaN. |
116 function COMPARE(x, ncr) { | 116 function COMPARE(x, ncr) { |
117 // Fast case for numbers and strings. | 117 var left; |
118 if (IS_NUMBER(this) && IS_NUMBER(x)) { | |
119 return %NumberCompare(this, x, ncr); | |
120 } | |
121 if (IS_STRING(this) && IS_STRING(x)) { | |
122 return %StringCompare(this, x); | |
123 } | |
124 | 118 |
125 // If one of the operands is undefined, it will convert to NaN and | 119 // Fast cases for string, numbers and undefined compares. |
126 // thus the result should be as if one of the operands was NaN. | 120 if (IS_STRING(this)) { |
127 if (IS_UNDEFINED(this) || IS_UNDEFINED(x)) { | 121 if (IS_STRING(x)) return %StringCompare(this, x); |
| 122 if (IS_UNDEFINED(x)) return ncr; |
| 123 left = this; |
| 124 } else if (IS_NUMBER(this)) { |
| 125 if (IS_NUMBER(x)) return %NumberCompare(this, x, ncr); |
| 126 if (IS_UNDEFINED(x)) return ncr; |
| 127 left = this; |
| 128 } else if (IS_UNDEFINED(this)) { |
128 return ncr; | 129 return ncr; |
| 130 } else { |
| 131 if (IS_UNDEFINED(x)) return ncr; |
| 132 left = %ToPrimitive(this, NUMBER_HINT); |
129 } | 133 } |
130 | 134 |
131 // Default implementation. | 135 // Default implementation. |
132 var a = %ToPrimitive(this, NUMBER_HINT); | 136 var right = %ToPrimitive(x, NUMBER_HINT); |
133 var b = %ToPrimitive(x, NUMBER_HINT); | 137 if (IS_STRING(left) && IS_STRING(right)) { |
134 if (IS_STRING(a) && IS_STRING(b)) { | 138 return %StringCompare(left, right); |
135 return %StringCompare(a, b); | |
136 } else { | 139 } else { |
137 var a_number = %ToNumber(a); | 140 var left_number = %ToNumber(left); |
138 var b_number = %ToNumber(b); | 141 var right_number = %ToNumber(right); |
139 if (NUMBER_IS_NAN(a_number) || NUMBER_IS_NAN(b_number)) return ncr; | 142 if (NUMBER_IS_NAN(left_number) || NUMBER_IS_NAN(right_number)) return ncr; |
140 return %NumberCompare(a_number, b_number, ncr); | 143 return %NumberCompare(left_number, right_number, ncr); |
141 } | 144 } |
142 } | 145 } |
143 | 146 |
144 | 147 |
145 | 148 |
146 /* ----------------------------------- | 149 /* ----------------------------------- |
147 - - - A r i t h m e t i c - - - | 150 - - - A r i t h m e t i c - - - |
148 ----------------------------------- | 151 ----------------------------------- |
149 */ | 152 */ |
150 | 153 |
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603 throw %MakeTypeError('cannot_convert_to_primitive', []); | 606 throw %MakeTypeError('cannot_convert_to_primitive', []); |
604 } | 607 } |
605 | 608 |
606 | 609 |
607 // NOTE: Setting the prototype for Array must take place as early as | 610 // NOTE: Setting the prototype for Array must take place as early as |
608 // possible due to code generation for array literals. When | 611 // possible due to code generation for array literals. When |
609 // generating code for a array literal a boilerplate array is created | 612 // generating code for a array literal a boilerplate array is created |
610 // that is cloned when running the code. It is essiential that the | 613 // that is cloned when running the code. It is essiential that the |
611 // boilerplate gets the right prototype. | 614 // boilerplate gets the right prototype. |
612 %FunctionSetPrototype($Array, new $Array(0)); | 615 %FunctionSetPrototype($Array, new $Array(0)); |
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