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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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| 2656   static const uint32_t kMaxGap = 1024; | 2656   static const uint32_t kMaxGap = 1024; | 
| 2657 | 2657 | 
| 2658   // Maximal length of fast elements array that won't be checked for | 2658   // Maximal length of fast elements array that won't be checked for | 
| 2659   // being dense enough on expansion. | 2659   // being dense enough on expansion. | 
| 2660   static const int kMaxUncheckedFastElementsLength = 5000; | 2660   static const int kMaxUncheckedFastElementsLength = 5000; | 
| 2661 | 2661 | 
| 2662   // Same as above but for old arrays. This limit is more strict. We | 2662   // Same as above but for old arrays. This limit is more strict. We | 
| 2663   // don't want to be wasteful with long lived objects. | 2663   // don't want to be wasteful with long lived objects. | 
| 2664   static const int kMaxUncheckedOldFastElementsLength = 500; | 2664   static const int kMaxUncheckedOldFastElementsLength = 500; | 
| 2665 | 2665 | 
| 2666   // Note that Heap::MaxRegularSpaceAllocationSize() puts a limit on | 2666   // Note that Page::kMaxRegularHeapObjectSize puts a limit on | 
| 2667   // permissible values (see the ASSERT in heap.cc). | 2667   // permissible values (see the ASSERT in heap.cc). | 
| 2668   static const int kInitialMaxFastElementArray = 100000; | 2668   static const int kInitialMaxFastElementArray = 100000; | 
| 2669 | 2669 | 
| 2670   static const int kFastPropertiesSoftLimit = 12; | 2670   static const int kFastPropertiesSoftLimit = 12; | 
| 2671   static const int kMaxFastProperties = 64; | 2671   static const int kMaxFastProperties = 64; | 
| 2672   static const int kMaxInstanceSize = 255 * kPointerSize; | 2672   static const int kMaxInstanceSize = 255 * kPointerSize; | 
| 2673   // When extending the backing storage for property values, we increase | 2673   // When extending the backing storage for property values, we increase | 
| 2674   // its size by more than the 1 entry necessary, so sequentially adding fields | 2674   // its size by more than the 1 entry necessary, so sequentially adding fields | 
| 2675   // to the same object requires fewer allocations and copies. | 2675   // to the same object requires fewer allocations and copies. | 
| 2676   static const int kFieldsAdded = 3; | 2676   static const int kFieldsAdded = 3; | 
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| 10756     } else { | 10756     } else { | 
| 10757       value &= ~(1 << bit_position); | 10757       value &= ~(1 << bit_position); | 
| 10758     } | 10758     } | 
| 10759     return value; | 10759     return value; | 
| 10760   } | 10760   } | 
| 10761 }; | 10761 }; | 
| 10762 | 10762 | 
| 10763 } }  // namespace v8::internal | 10763 } }  // namespace v8::internal | 
| 10764 | 10764 | 
| 10765 #endif  // V8_OBJECTS_H_ | 10765 #endif  // V8_OBJECTS_H_ | 
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