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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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| 95 | 95 |
| 96 inline int number_of_entries() { return number_of_transitions(); } | 96 inline int number_of_entries() { return number_of_transitions(); } |
| 97 | 97 |
| 98 // Allocate a new transition array with a single entry. | 98 // Allocate a new transition array with a single entry. |
| 99 static MUST_USE_RESULT MaybeObject* NewWith( | 99 static MUST_USE_RESULT MaybeObject* NewWith( |
| 100 SimpleTransitionFlag flag, | 100 SimpleTransitionFlag flag, |
| 101 Name* key, | 101 Name* key, |
| 102 Map* target, | 102 Map* target, |
| 103 Object* back_pointer); | 103 Object* back_pointer); |
| 104 | 104 |
| 105 static Handle<TransitionArray> NewWithHandle( |
| 106 SimpleTransitionFlag flag, |
| 107 Handle<Name> key, |
| 108 Handle<Map> target, |
| 109 Handle<Object> back_pointer); |
| 110 |
| 105 MUST_USE_RESULT MaybeObject* ExtendToFullTransitionArray(); | 111 MUST_USE_RESULT MaybeObject* ExtendToFullTransitionArray(); |
| 106 | 112 |
| 107 // Copy the transition array, inserting a new transition. | 113 // Copy the transition array, inserting a new transition. |
| 108 // TODO(verwaest): This should not cause an existing transition to be | 114 // TODO(verwaest): This should not cause an existing transition to be |
| 109 // overwritten. | 115 // overwritten. |
| 110 MUST_USE_RESULT MaybeObject* CopyInsert(Name* name, Map* target); | 116 static Handle<TransitionArray> CopyInsert(Handle<TransitionArray> array, |
| 117 Handle<Name> name, |
| 118 Handle<Map> target); |
| 119 |
| 120 MUST_USE_RESULT MaybeObject* CopyInsert(Name* name, |
| 121 Map* target); |
| 111 | 122 |
| 112 // Copy a single transition from the origin array. | 123 // Copy a single transition from the origin array. |
| 113 inline void NoIncrementalWriteBarrierCopyFrom(TransitionArray* origin, | 124 inline void NoIncrementalWriteBarrierCopyFrom(TransitionArray* origin, |
| 114 int origin_transition, | 125 int origin_transition, |
| 115 int target_transition); | 126 int target_transition); |
| 116 | 127 |
| 117 // Search a transition for a given property name. | 128 // Search a transition for a given property name. |
| 118 inline int Search(Name* name); | 129 inline int Search(Name* name); |
| 119 | 130 |
| 120 // Allocates a TransitionArray. | 131 // Allocates a TransitionArray. |
| 132 static Handle<TransitionArray> AllocateHandle( |
| 133 Isolate* isolate, int number_of_transitions); |
| 134 |
| 121 MUST_USE_RESULT static MaybeObject* Allocate( | 135 MUST_USE_RESULT static MaybeObject* Allocate( |
| 122 Isolate* isolate, int number_of_transitions); | 136 Isolate* isolate, int number_of_transitions); |
| 123 | 137 |
| 124 bool IsSimpleTransition() { | 138 bool IsSimpleTransition() { |
| 125 return length() == kSimpleTransitionSize && | 139 return length() == kSimpleTransitionSize && |
| 126 get(kSimpleTransitionTarget)->IsHeapObject() && | 140 get(kSimpleTransitionTarget)->IsHeapObject() && |
| 127 // The IntrusivePrototypeTransitionIterator may have set the map of the | 141 // The IntrusivePrototypeTransitionIterator may have set the map of the |
| 128 // prototype transitions array to a smi. In that case, there are | 142 // prototype transitions array to a smi. In that case, there are |
| 129 // prototype transitions, hence this transition array is a full | 143 // prototype transitions, hence this transition array is a full |
| 130 // transition array. | 144 // transition array. |
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| 202 Name* key, | 216 Name* key, |
| 203 Map* target); | 217 Map* target); |
| 204 | 218 |
| 205 DISALLOW_IMPLICIT_CONSTRUCTORS(TransitionArray); | 219 DISALLOW_IMPLICIT_CONSTRUCTORS(TransitionArray); |
| 206 }; | 220 }; |
| 207 | 221 |
| 208 | 222 |
| 209 } } // namespace v8::internal | 223 } } // namespace v8::internal |
| 210 | 224 |
| 211 #endif // V8_TRANSITIONS_H_ | 225 #endif // V8_TRANSITIONS_H_ |
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