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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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725 } | 725 } |
726 | 726 |
727 | 727 |
728 // ECMA-262, section 9.4, page 34. | 728 // ECMA-262, section 9.4, page 34. |
729 function ToInteger(x) { | 729 function ToInteger(x) { |
730 if (%_IsSmi(x)) return x; | 730 if (%_IsSmi(x)) return x; |
731 return %NumberToInteger(ToNumber(x)); | 731 return %NumberToInteger(ToNumber(x)); |
732 } | 732 } |
733 | 733 |
734 | 734 |
735 // ES6, draft 08-24-14, section 7.1.15 | 735 // ES6, section 7.1.15 |
736 function ToLength(arg) { | 736 function ToLength(arg) { |
737 arg = ToInteger(arg); | 737 arg = TO_NUMBER_INLINE(arg); |
738 if (arg < 0) return 0; | 738 if (arg <= 0 || NUMBER_IS_NAN(arg)) return 0; |
739 return arg < GlobalNumber.MAX_SAFE_INTEGER ? arg | 739 arg = %_MathFloor(arg); |
adamk
2015/08/25 21:55:42
This line is the problem. I get a crash if |arg| i
| |
740 : GlobalNumber.MAX_SAFE_INTEGER; | 740 return arg < kMaxSafeInteger ? arg : kMaxSafeInteger; |
741 } | 741 } |
742 | 742 |
743 | 743 |
744 // ES5, section 9.12 | 744 // ES5, section 9.12 |
745 function SameValue(x, y) { | 745 function SameValue(x, y) { |
746 if (typeof x != typeof y) return false; | 746 if (typeof x != typeof y) return false; |
747 if (IS_NUMBER(x)) { | 747 if (IS_NUMBER(x)) { |
748 if (NUMBER_IS_NAN(x) && NUMBER_IS_NAN(y)) return true; | 748 if (NUMBER_IS_NAN(x) && NUMBER_IS_NAN(y)) return true; |
749 // x is +0 and y is -0 or vice versa. | 749 // x is +0 and y is -0 or vice versa. |
750 if (x === 0 && y === 0 && %_IsMinusZero(x) != %_IsMinusZero(y)) { | 750 if (x === 0 && y === 0 && %_IsMinusZero(x) != %_IsMinusZero(y)) { |
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921 to["to_string_fun"] = ToString; | 921 to["to_string_fun"] = ToString; |
922 }); | 922 }); |
923 | 923 |
924 utils.Export(function(to) { | 924 utils.Export(function(to) { |
925 to.ToBoolean = ToBoolean; | 925 to.ToBoolean = ToBoolean; |
926 to.ToNumber = ToNumber; | 926 to.ToNumber = ToNumber; |
927 to.ToString = ToString; | 927 to.ToString = ToString; |
928 }) | 928 }) |
929 | 929 |
930 }) | 930 }) |
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