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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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607 // Returns if the given x is a primitive value - not an object or a | 607 // Returns if the given x is a primitive value - not an object or a |
608 // function. | 608 // function. |
609 function IsPrimitive(x) { | 609 function IsPrimitive(x) { |
610 // Even though the type of null is "object", null is still | 610 // Even though the type of null is "object", null is still |
611 // considered a primitive value. IS_SPEC_OBJECT handles this correctly | 611 // considered a primitive value. IS_SPEC_OBJECT handles this correctly |
612 // (i.e., it will return false if x is null). | 612 // (i.e., it will return false if x is null). |
613 return !IS_SPEC_OBJECT(x); | 613 return !IS_SPEC_OBJECT(x); |
614 } | 614 } |
615 | 615 |
616 | 616 |
| 617 // ES6, draft 10-14-14, section 22.1.3.1.1 |
| 618 function IsConcatSpreadable(O) { |
| 619 if (!IS_SPEC_OBJECT(O)) return false; |
| 620 var spreadable = O[symbolIsConcatSpreadable]; |
| 621 if (IS_UNDEFINED(spreadable)) return IS_ARRAY(O); |
| 622 return ToBoolean(spreadable); |
| 623 } |
| 624 |
| 625 |
617 // ECMA-262, section 8.6.2.6, page 28. | 626 // ECMA-262, section 8.6.2.6, page 28. |
618 function DefaultNumber(x) { | 627 function DefaultNumber(x) { |
619 if (!IS_SYMBOL_WRAPPER(x)) { | 628 if (!IS_SYMBOL_WRAPPER(x)) { |
620 var valueOf = x.valueOf; | 629 var valueOf = x.valueOf; |
621 if (IS_SPEC_FUNCTION(valueOf)) { | 630 if (IS_SPEC_FUNCTION(valueOf)) { |
622 var v = %_CallFunction(x, valueOf); | 631 var v = %_CallFunction(x, valueOf); |
623 if (%IsPrimitive(v)) return v; | 632 if (%IsPrimitive(v)) return v; |
624 } | 633 } |
625 | 634 |
626 var toString = x.toString; | 635 var toString = x.toString; |
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656 return i; | 665 return i; |
657 } | 666 } |
658 | 667 |
659 | 668 |
660 // NOTE: Setting the prototype for Array must take place as early as | 669 // NOTE: Setting the prototype for Array must take place as early as |
661 // possible due to code generation for array literals. When | 670 // possible due to code generation for array literals. When |
662 // generating code for a array literal a boilerplate array is created | 671 // generating code for a array literal a boilerplate array is created |
663 // that is cloned when running the code. It is essential that the | 672 // that is cloned when running the code. It is essential that the |
664 // boilerplate gets the right prototype. | 673 // boilerplate gets the right prototype. |
665 %FunctionSetPrototype($Array, new $Array(0)); | 674 %FunctionSetPrototype($Array, new $Array(0)); |
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