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Side by Side Diff: src/transitions.h

Issue 10816005: Swapped transition array and descriptor array. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: u Created 8 years, 4 months ago
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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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56 56
57 inline PropertyDetails GetTargetDetails(int transition_number); 57 inline PropertyDetails GetTargetDetails(int transition_number);
58 58
59 inline Map* elements_transition(); 59 inline Map* elements_transition();
60 inline void set_elements_transition( 60 inline void set_elements_transition(
61 Map* target, 61 Map* target,
62 WriteBarrierMode mode = UPDATE_WRITE_BARRIER); 62 WriteBarrierMode mode = UPDATE_WRITE_BARRIER);
63 inline bool HasElementsTransition(); 63 inline bool HasElementsTransition();
64 inline void ClearElementsTransition(); 64 inline void ClearElementsTransition();
65 65
66 inline DescriptorArray* descriptors();
67 inline void set_descriptors(DescriptorArray* descriptors,
68 WriteBarrierMode mode = UPDATE_WRITE_BARRIER);
69 inline Object** GetDescriptorsSlot();
70
71 inline Object* back_pointer_storage();
72 inline void set_back_pointer_storage(
73 Object* back_pointer,
74 WriteBarrierMode mode = UPDATE_WRITE_BARRIER);
75
66 inline FixedArray* GetPrototypeTransitions(); 76 inline FixedArray* GetPrototypeTransitions();
67 inline void SetPrototypeTransitions( 77 inline void SetPrototypeTransitions(
68 FixedArray* prototype_transitions, 78 FixedArray* prototype_transitions,
69 WriteBarrierMode mode = UPDATE_WRITE_BARRIER); 79 WriteBarrierMode mode = UPDATE_WRITE_BARRIER);
70 inline Object** GetPrototypeTransitionsSlot(); 80 inline Object** GetPrototypeTransitionsSlot();
71 inline bool HasPrototypeTransitions(); 81 inline bool HasPrototypeTransitions();
72 inline HeapObject* UncheckedPrototypeTransitions(); 82 inline HeapObject* UncheckedPrototypeTransitions();
73 83
74 // Returns the number of transitions in the array. 84 // Returns the number of transitions in the array.
75 int number_of_transitions() { 85 int number_of_transitions() {
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99 109
100 // Allocates a TransitionArray. 110 // Allocates a TransitionArray.
101 MUST_USE_RESULT static MaybeObject* Allocate(int number_of_transitions); 111 MUST_USE_RESULT static MaybeObject* Allocate(int number_of_transitions);
102 112
103 // Casting. 113 // Casting.
104 static inline TransitionArray* cast(Object* obj); 114 static inline TransitionArray* cast(Object* obj);
105 115
106 // Constant for denoting key was not found. 116 // Constant for denoting key was not found.
107 static const int kNotFound = -1; 117 static const int kNotFound = -1;
108 118
109 static const int kElementsTransitionIndex = 0; 119 static const int kDescriptorsIndex = 0;
110 static const int kPrototypeTransitionsIndex = 1; 120 static const int kBackPointerStorageIndex = 1;
111 static const int kFirstIndex = 2; 121 static const int kElementsTransitionIndex = 2;
122 static const int kPrototypeTransitionsIndex = 3;
123 static const int kFirstIndex = 4;
112 124
113 // Layout transition array header. 125 // Layout transition array header.
114 static const int kElementsTransitionOffset = FixedArray::kHeaderSize; 126 static const int kDescriptorsOffset = FixedArray::kHeaderSize;
127 static const int kBackPointerStorageOffset = kDescriptorsOffset +
128 kPointerSize;
129 static const int kElementsTransitionOffset = kBackPointerStorageOffset +
130 kPointerSize;
115 static const int kPrototypeTransitionsOffset = kElementsTransitionOffset + 131 static const int kPrototypeTransitionsOffset = kElementsTransitionOffset +
116 kPointerSize; 132 kPointerSize;
117 static const int kFirstOffset = kPrototypeTransitionsOffset + kPointerSize;
118 133
119 // Layout of map transition. 134 // Layout of map transition.
120 static const int kTransitionKey = 0; 135 static const int kTransitionKey = 0;
121 static const int kTransitionTarget = 1; 136 static const int kTransitionTarget = 1;
122 static const int kTransitionSize = 2; 137 static const int kTransitionSize = 2;
123 138
124 #ifdef OBJECT_PRINT 139 #ifdef OBJECT_PRINT
125 // Print all the transitions. 140 // Print all the transitions.
126 inline void PrintTransitions() { 141 inline void PrintTransitions() {
127 PrintTransitions(stdout); 142 PrintTransitions(stdout);
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158 Map* target, 173 Map* target,
159 const WhitenessWitness&); 174 const WhitenessWitness&);
160 175
161 DISALLOW_IMPLICIT_CONSTRUCTORS(TransitionArray); 176 DISALLOW_IMPLICIT_CONSTRUCTORS(TransitionArray);
162 }; 177 };
163 178
164 179
165 } } // namespace v8::internal 180 } } // namespace v8::internal
166 181
167 #endif // V8_TRANSITIONS_H_ 182 #endif // V8_TRANSITIONS_H_
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