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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 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // This files contains runtime support implemented in JavaScript. | 5 // This files contains runtime support implemented in JavaScript. |
6 | 6 |
7 // CAUTION: Some of the functions specified in this file are called | 7 // CAUTION: Some of the functions specified in this file are called |
8 // directly from compiled code. These are the functions with names in | 8 // directly from compiled code. These are the functions with names in |
9 // ALL CAPS. The compiled code passes the first argument in 'this'. | 9 // ALL CAPS. The compiled code passes the first argument in 'this'. |
10 | 10 |
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594 if (IS_NUMBER(x)) { | 594 if (IS_NUMBER(x)) { |
595 if (NUMBER_IS_NAN(x) && NUMBER_IS_NAN(y)) return true; | 595 if (NUMBER_IS_NAN(x) && NUMBER_IS_NAN(y)) return true; |
596 // x is +0 and y is -0 or vice versa. | 596 // x is +0 and y is -0 or vice versa. |
597 if (x === 0 && y === 0 && %_IsMinusZero(x) != %_IsMinusZero(y)) { | 597 if (x === 0 && y === 0 && %_IsMinusZero(x) != %_IsMinusZero(y)) { |
598 return false; | 598 return false; |
599 } | 599 } |
600 } | 600 } |
601 return x === y; | 601 return x === y; |
602 } | 602 } |
603 | 603 |
| 604 // ES6, section 7.2.4 |
| 605 function SameValueZero(x, y) { |
| 606 if (typeof x != typeof y) return false; |
| 607 if (IS_NUMBER(x)) { |
| 608 if (NUMBER_IS_NAN(x) && NUMBER_IS_NAN(y)) return true; |
| 609 } |
| 610 return x === y; |
| 611 } |
| 612 |
604 | 613 |
605 /* --------------------------------- | 614 /* --------------------------------- |
606 - - - U t i l i t i e s - - - | 615 - - - U t i l i t i e s - - - |
607 --------------------------------- | 616 --------------------------------- |
608 */ | 617 */ |
609 | 618 |
610 // Returns if the given x is a primitive value - not an object or a | 619 // Returns if the given x is a primitive value - not an object or a |
611 // function. | 620 // function. |
612 function IsPrimitive(x) { | 621 function IsPrimitive(x) { |
613 // Even though the type of null is "object", null is still | 622 // Even though the type of null is "object", null is still |
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659 return i; | 668 return i; |
660 } | 669 } |
661 | 670 |
662 | 671 |
663 // NOTE: Setting the prototype for Array must take place as early as | 672 // NOTE: Setting the prototype for Array must take place as early as |
664 // possible due to code generation for array literals. When | 673 // possible due to code generation for array literals. When |
665 // generating code for a array literal a boilerplate array is created | 674 // generating code for a array literal a boilerplate array is created |
666 // that is cloned when running the code. It is essential that the | 675 // that is cloned when running the code. It is essential that the |
667 // boilerplate gets the right prototype. | 676 // boilerplate gets the right prototype. |
668 %FunctionSetPrototype($Array, new $Array(0)); | 677 %FunctionSetPrototype($Array, new $Array(0)); |
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