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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 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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2708 static const uint32_t kMaxGap = 1024; | 2708 static const uint32_t kMaxGap = 1024; |
2709 | 2709 |
2710 // Maximal length of fast elements array that won't be checked for | 2710 // Maximal length of fast elements array that won't be checked for |
2711 // being dense enough on expansion. | 2711 // being dense enough on expansion. |
2712 static const int kMaxUncheckedFastElementsLength = 5000; | 2712 static const int kMaxUncheckedFastElementsLength = 5000; |
2713 | 2713 |
2714 // Same as above but for old arrays. This limit is more strict. We | 2714 // Same as above but for old arrays. This limit is more strict. We |
2715 // don't want to be wasteful with long lived objects. | 2715 // don't want to be wasteful with long lived objects. |
2716 static const int kMaxUncheckedOldFastElementsLength = 500; | 2716 static const int kMaxUncheckedOldFastElementsLength = 500; |
2717 | 2717 |
2718 static const int kInitialMaxFastElementArray = 100000; | 2718 // TODO(2790): HAllocate currently always allocates fast backing stores |
| 2719 // in new space, where on x64 we can only fit ~98K elements. Keep this |
| 2720 // limit lower than that until HAllocate is made smarter. |
| 2721 static const int kInitialMaxFastElementArray = 95000; |
| 2722 |
2719 static const int kFastPropertiesSoftLimit = 12; | 2723 static const int kFastPropertiesSoftLimit = 12; |
2720 static const int kMaxFastProperties = 64; | 2724 static const int kMaxFastProperties = 64; |
2721 static const int kMaxInstanceSize = 255 * kPointerSize; | 2725 static const int kMaxInstanceSize = 255 * kPointerSize; |
2722 // When extending the backing storage for property values, we increase | 2726 // When extending the backing storage for property values, we increase |
2723 // its size by more than the 1 entry necessary, so sequentially adding fields | 2727 // its size by more than the 1 entry necessary, so sequentially adding fields |
2724 // to the same object requires fewer allocations and copies. | 2728 // to the same object requires fewer allocations and copies. |
2725 static const int kFieldsAdded = 3; | 2729 static const int kFieldsAdded = 3; |
2726 | 2730 |
2727 // Layout description. | 2731 // Layout description. |
2728 static const int kPropertiesOffset = HeapObject::kHeaderSize; | 2732 static const int kPropertiesOffset = HeapObject::kHeaderSize; |
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10187 } else { | 10191 } else { |
10188 value &= ~(1 << bit_position); | 10192 value &= ~(1 << bit_position); |
10189 } | 10193 } |
10190 return value; | 10194 return value; |
10191 } | 10195 } |
10192 }; | 10196 }; |
10193 | 10197 |
10194 } } // namespace v8::internal | 10198 } } // namespace v8::internal |
10195 | 10199 |
10196 #endif // V8_OBJECTS_H_ | 10200 #endif // V8_OBJECTS_H_ |
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