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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 // 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 #ifndef V8_OBJECTS_H_ | 5 #ifndef V8_OBJECTS_H_ |
6 #define V8_OBJECTS_H_ | 6 #define V8_OBJECTS_H_ |
7 | 7 |
8 #include <iosfwd> | 8 #include <iosfwd> |
9 | 9 |
10 #include "src/allocation.h" | 10 #include "src/allocation.h" |
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2238 static const int kMaxUncheckedFastElementsLength = 5000; | 2238 static const int kMaxUncheckedFastElementsLength = 5000; |
2239 | 2239 |
2240 // Same as above but for old arrays. This limit is more strict. We | 2240 // Same as above but for old arrays. This limit is more strict. We |
2241 // don't want to be wasteful with long lived objects. | 2241 // don't want to be wasteful with long lived objects. |
2242 static const int kMaxUncheckedOldFastElementsLength = 500; | 2242 static const int kMaxUncheckedOldFastElementsLength = 500; |
2243 | 2243 |
2244 // Note that Page::kMaxRegularHeapObjectSize puts a limit on | 2244 // Note that Page::kMaxRegularHeapObjectSize puts a limit on |
2245 // permissible values (see the DCHECK in heap.cc). | 2245 // permissible values (see the DCHECK in heap.cc). |
2246 static const int kInitialMaxFastElementArray = 100000; | 2246 static const int kInitialMaxFastElementArray = 100000; |
2247 | 2247 |
2248 // This constant applies only to the initial map of "$Object" aka | 2248 // This constant applies only to the initial map of "global.Object" and |
2249 // "global.Object" and not to arbitrary other JSObject maps. | 2249 // not to arbitrary other JSObject maps. |
2250 static const int kInitialGlobalObjectUnusedPropertiesCount = 4; | 2250 static const int kInitialGlobalObjectUnusedPropertiesCount = 4; |
2251 | 2251 |
2252 static const int kMaxInstanceSize = 255 * kPointerSize; | 2252 static const int kMaxInstanceSize = 255 * kPointerSize; |
2253 // When extending the backing storage for property values, we increase | 2253 // When extending the backing storage for property values, we increase |
2254 // its size by more than the 1 entry necessary, so sequentially adding fields | 2254 // its size by more than the 1 entry necessary, so sequentially adding fields |
2255 // to the same object requires fewer allocations and copies. | 2255 // to the same object requires fewer allocations and copies. |
2256 static const int kFieldsAdded = 3; | 2256 static const int kFieldsAdded = 3; |
2257 | 2257 |
2258 // Layout description. | 2258 // Layout description. |
2259 static const int kPropertiesOffset = HeapObject::kHeaderSize; | 2259 static const int kPropertiesOffset = HeapObject::kHeaderSize; |
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11110 } else { | 11110 } else { |
11111 value &= ~(1 << bit_position); | 11111 value &= ~(1 << bit_position); |
11112 } | 11112 } |
11113 return value; | 11113 return value; |
11114 } | 11114 } |
11115 }; | 11115 }; |
11116 | 11116 |
11117 } } // namespace v8::internal | 11117 } } // namespace v8::internal |
11118 | 11118 |
11119 #endif // V8_OBJECTS_H_ | 11119 #endif // V8_OBJECTS_H_ |
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