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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' and | 9 // ALL CAPS. The compiled code passes the first argument in 'this' and |
10 // it does not push the function onto the stack. This means that you | 10 // it does not push the function onto the stack. This means that you |
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556 } | 556 } |
557 | 557 |
558 | 558 |
559 // ECMA-262, section 9.4, page 34. | 559 // ECMA-262, section 9.4, page 34. |
560 function ToInteger(x) { | 560 function ToInteger(x) { |
561 if (%_IsSmi(x)) return x; | 561 if (%_IsSmi(x)) return x; |
562 return %NumberToInteger(ToNumber(x)); | 562 return %NumberToInteger(ToNumber(x)); |
563 } | 563 } |
564 | 564 |
565 | 565 |
| 566 // ES6, draft 08-24-14, section 7.1.15 |
| 567 function ToLength(arg) { |
| 568 arg = ToInteger(arg); |
| 569 if (arg < 0) return 0; |
| 570 return arg < $Number.MAX_SAFE_INTEGER ? arg : $Number.MAX_SAFE_INTEGER; |
| 571 } |
| 572 |
| 573 |
566 // ECMA-262, section 9.6, page 34. | 574 // ECMA-262, section 9.6, page 34. |
567 function ToUint32(x) { | 575 function ToUint32(x) { |
568 if (%_IsSmi(x) && x >= 0) return x; | 576 if (%_IsSmi(x) && x >= 0) return x; |
569 return %NumberToJSUint32(ToNumber(x)); | 577 return %NumberToJSUint32(ToNumber(x)); |
570 } | 578 } |
571 | 579 |
572 | 580 |
573 // ECMA-262, section 9.5, page 34 | 581 // ECMA-262, section 9.5, page 34 |
574 function ToInt32(x) { | 582 function ToInt32(x) { |
575 if (%_IsSmi(x)) return x; | 583 if (%_IsSmi(x)) return x; |
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648 return i; | 656 return i; |
649 } | 657 } |
650 | 658 |
651 | 659 |
652 // NOTE: Setting the prototype for Array must take place as early as | 660 // NOTE: Setting the prototype for Array must take place as early as |
653 // possible due to code generation for array literals. When | 661 // possible due to code generation for array literals. When |
654 // generating code for a array literal a boilerplate array is created | 662 // generating code for a array literal a boilerplate array is created |
655 // that is cloned when running the code. It is essential that the | 663 // that is cloned when running the code. It is essential that the |
656 // boilerplate gets the right prototype. | 664 // boilerplate gets the right prototype. |
657 %FunctionSetPrototype($Array, new $Array(0)); | 665 %FunctionSetPrototype($Array, new $Array(0)); |
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