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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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65 inline PropertyDetails GetTargetDetails(int transition_number); | 65 inline PropertyDetails GetTargetDetails(int transition_number); |
66 | 66 |
67 inline Map* elements_transition(); | 67 inline Map* elements_transition(); |
68 inline void set_elements_transition( | 68 inline void set_elements_transition( |
69 Map* target, | 69 Map* target, |
70 WriteBarrierMode mode = UPDATE_WRITE_BARRIER); | 70 WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
71 inline bool HasElementsTransition(); | 71 inline bool HasElementsTransition(); |
72 inline void ClearElementsTransition(); | 72 inline void ClearElementsTransition(); |
73 | 73 |
74 inline DescriptorArray* descriptors(); | 74 inline DescriptorArray* descriptors(); |
75 inline void set_descriptors(DescriptorArray* descriptors); | 75 inline void set_descriptors(DescriptorArray* descriptors, |
76 inline JSGlobalPropertyCell* descriptors_pointer(); | 76 WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
77 inline void set_descriptors_pointer(JSGlobalPropertyCell* pointer); | 77 inline Object** GetDescriptorsSlot(); |
78 | 78 |
79 inline Object* back_pointer_storage(); | 79 inline Object* back_pointer_storage(); |
80 inline void set_back_pointer_storage( | 80 inline void set_back_pointer_storage( |
81 Object* back_pointer, | 81 Object* back_pointer, |
82 WriteBarrierMode mode = UPDATE_WRITE_BARRIER); | 82 WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
83 | 83 |
84 inline FixedArray* GetPrototypeTransitions(); | 84 inline FixedArray* GetPrototypeTransitions(); |
85 inline void SetPrototypeTransitions( | 85 inline void SetPrototypeTransitions( |
86 FixedArray* prototype_transitions, | 86 FixedArray* prototype_transitions, |
87 WriteBarrierMode mode = UPDATE_WRITE_BARRIER); | 87 WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
88 inline Object** GetPrototypeTransitionsSlot(); | 88 inline Object** GetPrototypeTransitionsSlot(); |
89 inline bool HasPrototypeTransitions(); | 89 inline bool HasPrototypeTransitions(); |
90 inline HeapObject* UncheckedPrototypeTransitions(); | 90 inline HeapObject* UncheckedPrototypeTransitions(); |
91 | 91 |
92 // Returns the number of transitions in the array. | 92 // Returns the number of transitions in the array. |
93 int number_of_transitions() { | 93 int number_of_transitions() { |
94 if (IsSimpleTransition()) return 1; | 94 ASSERT(length() >= kFirstIndex); |
95 int len = length(); | 95 int len = length(); |
96 return len <= kFirstIndex ? 0 : (len - kFirstIndex) / kTransitionSize; | 96 return len <= kFirstIndex ? 0 : (len - kFirstIndex) / kTransitionSize; |
97 } | 97 } |
98 | 98 |
99 inline int number_of_entries() { return number_of_transitions(); } | 99 inline int number_of_entries() { return number_of_transitions(); } |
100 | 100 |
101 // Allocate a new transition array with a single entry. | 101 // Allocate a new transition array with a single entry. |
102 static MUST_USE_RESULT MaybeObject* NewWith( | 102 static MUST_USE_RESULT MaybeObject* NewWith(String* name, Map* target); |
103 SimpleTransitionFlag flag, | |
104 String* key, | |
105 Map* target, | |
106 JSGlobalPropertyCell* descriptor_pointer, | |
107 Object* back_pointer); | |
108 | |
109 static MUST_USE_RESULT MaybeObject* AllocateDescriptorsHolder( | |
110 JSGlobalPropertyCell* descriptor_pointer); | |
111 | |
112 MUST_USE_RESULT MaybeObject* ExtendToFullTransitionArray(); | |
113 | 103 |
114 // Copy the transition array, inserting a new transition. | 104 // Copy the transition array, inserting a new transition. |
115 // TODO(verwaest): This should not cause an existing transition to be | 105 // TODO(verwaest): This should not cause an existing transition to be |
116 // overwritten. | 106 // overwritten. |
117 MUST_USE_RESULT MaybeObject* CopyInsert(String* name, Map* target); | 107 MUST_USE_RESULT MaybeObject* CopyInsert(String* name, Map* target); |
118 | 108 |
119 // Copy a single transition from the origin array. | 109 // Copy a single transition from the origin array. |
120 inline void NoIncrementalWriteBarrierCopyFrom(TransitionArray* origin, | 110 inline void CopyFrom(TransitionArray* origin, |
121 int origin_transition, | 111 int origin_transition, |
122 int target_transition); | 112 int target_transition, |
| 113 const WhitenessWitness& witness); |
123 | 114 |
124 // Search a transition for a given property name. | 115 // Search a transition for a given property name. |
125 inline int Search(String* name); | 116 inline int Search(String* name); |
126 | 117 |
127 // Allocates a TransitionArray. | 118 // Allocates a TransitionArray. |
128 MUST_USE_RESULT static MaybeObject* Allocate( | 119 MUST_USE_RESULT static MaybeObject* Allocate(int number_of_transitions); |
129 int number_of_transitions, | |
130 JSGlobalPropertyCell* descriptors_cell); | |
131 | |
132 bool IsDescriptorsHolder() { return length() == kDescriptorsHolderSize; } | |
133 bool IsSimpleTransition() { return length() == kSimpleTransitionSize; } | |
134 bool IsFullTransitionArray() { return length() >= kFirstIndex; } | |
135 | 120 |
136 // Casting. | 121 // Casting. |
137 static inline TransitionArray* cast(Object* obj); | 122 static inline TransitionArray* cast(Object* obj); |
138 | 123 |
139 // Constant for denoting key was not found. | 124 // Constant for denoting key was not found. |
140 static const int kNotFound = -1; | 125 static const int kNotFound = -1; |
141 | 126 |
142 static const int kDescriptorsPointerIndex = 0; | 127 static const int kDescriptorsIndex = 0; |
143 static const int kBackPointerStorageIndex = 1; | 128 static const int kBackPointerStorageIndex = 1; |
144 static const int kDescriptorsHolderSize = 2; | |
145 | |
146 // Layout for full transition arrays. | |
147 static const int kElementsTransitionIndex = 2; | 129 static const int kElementsTransitionIndex = 2; |
148 static const int kPrototypeTransitionsIndex = 3; | 130 static const int kPrototypeTransitionsIndex = 3; |
149 static const int kFirstIndex = 4; | 131 static const int kFirstIndex = 4; |
150 | 132 |
151 // Layout for simple transition arrays. | 133 // Layout transition array header. |
152 static const int kSimpleTransitionTarget = 2; | 134 static const int kDescriptorsOffset = FixedArray::kHeaderSize; |
153 static const int kSimpleTransitionSize = 3; | 135 static const int kBackPointerStorageOffset = kDescriptorsOffset + |
154 static const int kSimpleTransitionIndex = 0; | |
155 STATIC_ASSERT(kSimpleTransitionIndex != kNotFound); | |
156 | |
157 static const int kDescriptorsPointerOffset = FixedArray::kHeaderSize; | |
158 static const int kBackPointerStorageOffset = kDescriptorsPointerOffset + | |
159 kPointerSize; | 136 kPointerSize; |
160 | |
161 // Layout for the full transition array header. | |
162 static const int kElementsTransitionOffset = kBackPointerStorageOffset + | 137 static const int kElementsTransitionOffset = kBackPointerStorageOffset + |
163 kPointerSize; | 138 kPointerSize; |
164 static const int kPrototypeTransitionsOffset = kElementsTransitionOffset + | 139 static const int kPrototypeTransitionsOffset = kElementsTransitionOffset + |
165 kPointerSize; | 140 kPointerSize; |
166 | 141 |
167 // Layout of map transition entries in full transition arrays. | 142 // Layout of map transition. |
168 static const int kTransitionKey = 0; | 143 static const int kTransitionKey = 0; |
169 static const int kTransitionTarget = 1; | 144 static const int kTransitionTarget = 1; |
170 static const int kTransitionSize = 2; | 145 static const int kTransitionSize = 2; |
171 | 146 |
172 #ifdef OBJECT_PRINT | 147 #ifdef OBJECT_PRINT |
173 // Print all the transitions. | 148 // Print all the transitions. |
174 inline void PrintTransitions() { | 149 inline void PrintTransitions() { |
175 PrintTransitions(stdout); | 150 PrintTransitions(stdout); |
176 } | 151 } |
177 void PrintTransitions(FILE* out); | 152 void PrintTransitions(FILE* out); |
178 #endif | 153 #endif |
179 | 154 |
180 #ifdef DEBUG | 155 #ifdef DEBUG |
181 bool IsSortedNoDuplicates(int valid_entries = -1); | 156 bool IsSortedNoDuplicates(); |
182 bool IsConsistentWithBackPointers(Map* current_map); | 157 bool IsConsistentWithBackPointers(Map* current_map); |
183 bool IsEqualTo(TransitionArray* other); | 158 bool IsEqualTo(TransitionArray* other); |
184 #endif | 159 #endif |
185 | 160 |
186 // The maximum number of transitions we want in a transition array (should | 161 // The maximum number of transitions we want in a transition array (should |
187 // fit in a page). | 162 // fit in a page). |
188 static const int kMaxNumberOfTransitions = 1024 + 512; | 163 static const int kMaxNumberOfTransitions = 1024 + 512; |
189 | 164 |
190 private: | 165 private: |
191 // Conversion from transition number to array indices. | 166 // Conversion from transition number to array indices. |
192 static int ToKeyIndex(int transition_number) { | 167 static int ToKeyIndex(int transition_number) { |
193 return kFirstIndex + | 168 return kFirstIndex + |
194 (transition_number * kTransitionSize) + | 169 (transition_number * kTransitionSize) + |
195 kTransitionKey; | 170 kTransitionKey; |
196 } | 171 } |
197 | 172 |
198 static int ToTargetIndex(int transition_number) { | 173 static int ToTargetIndex(int transition_number) { |
199 return kFirstIndex + | 174 return kFirstIndex + |
200 (transition_number * kTransitionSize) + | 175 (transition_number * kTransitionSize) + |
201 kTransitionTarget; | 176 kTransitionTarget; |
202 } | 177 } |
203 | 178 |
204 inline void NoIncrementalWriteBarrierSet(int transition_number, | 179 inline void Set(int transition_number, |
205 String* key, | 180 String* key, |
206 Map* target); | 181 Map* target, |
| 182 const WhitenessWitness&); |
207 | 183 |
208 DISALLOW_IMPLICIT_CONSTRUCTORS(TransitionArray); | 184 DISALLOW_IMPLICIT_CONSTRUCTORS(TransitionArray); |
209 }; | 185 }; |
210 | 186 |
211 | 187 |
212 } } // namespace v8::internal | 188 } } // namespace v8::internal |
213 | 189 |
214 #endif // V8_TRANSITIONS_H_ | 190 #endif // V8_TRANSITIONS_H_ |
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