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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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39 | 39 |
40 | 40 |
41 // TransitionArrays are fixed arrays used to hold map transitions for property, | 41 // TransitionArrays are fixed arrays used to hold map transitions for property, |
42 // constant, and element changes. | 42 // constant, and element changes. |
43 // The format of the these objects is: | 43 // The format of the these objects is: |
44 // [0] Elements transition | 44 // [0] Elements transition |
45 // [1] First transition | 45 // [1] First transition |
46 // [length() - kTransitionSize] Last transition | 46 // [length() - kTransitionSize] Last transition |
47 class TransitionArray: public FixedArray { | 47 class TransitionArray: public FixedArray { |
48 public: | 48 public: |
49 // Accessors for fetching instance transition at transition number. | |
50 inline String* GetKey(int transition_number); | |
51 inline void SetKey(int transition_number, String* value); | |
52 inline Object** GetKeySlot(int transition_number); | |
53 | |
54 inline Object* GetValue(int transition_number); | |
55 inline void SetValue(int transition_number, Object* value); | |
56 inline Object** GetValueSlot(int transition_number); | |
57 | |
58 inline Map* GetTargetMap(int transition_number); | |
59 inline PropertyDetails GetTargetDetails(int transition_number); | |
60 | |
49 inline Map* elements_transition(); | 61 inline Map* elements_transition(); |
50 inline void set_elements_transition( | 62 inline void set_elements_transition( |
51 Map* value, | 63 Map* value, |
52 WriteBarrierMode mode = UPDATE_WRITE_BARRIER); | 64 WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
65 inline Object** GetElementsSlot(); | |
Michael Starzinger
2012/07/09 16:40:55
Let's name that GetElementsTransitionSlot() instea
| |
66 inline bool HasElementsTransition(); | |
53 inline void ClearElementsTransition(); | 67 inline void ClearElementsTransition(); |
54 inline bool HasElementsTransition(); | 68 |
55 // Accessors for fetching instance transition at transition number. | 69 inline FixedArray* GetPrototypeTransitions(); |
56 inline String* GetKey(int transition_number); | 70 inline void SetPrototypeTransitions( |
57 inline Object** GetKeySlot(int transition_number); | 71 FixedArray* prototype_transitions, |
58 inline void SetKey(int transition_number, String* value); | 72 WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
59 inline Object* GetValue(int transition_number); | 73 inline Object** GetPrototypeTransitionsSlot(); |
60 inline Object** GetValueSlot(int transition_number); | 74 inline bool HasPrototypeTransitions(); |
61 inline void SetValue(int transition_number, Object* value); | 75 inline HeapObject* UncheckedPrototypeTransitions(); |
62 inline Map* GetTargetMap(int transition_number); | |
63 inline PropertyDetails GetTargetDetails(int transition_number); | |
64 inline Object** GetElementsSlot(); | |
65 | 76 |
66 // Returns the number of transitions in the array. | 77 // Returns the number of transitions in the array. |
67 int number_of_transitions() { | 78 int number_of_transitions() { |
68 ASSERT(length() >= kFirstIndex); | 79 ASSERT(length() >= kFirstIndex); |
69 int len = length(); | 80 int len = length(); |
70 return len <= kFirstIndex ? 0 : (len - kFirstIndex) / kTransitionSize; | 81 return len <= kFirstIndex ? 0 : (len - kFirstIndex) / kTransitionSize; |
71 } | 82 } |
72 | 83 |
73 inline int number_of_entries() { return number_of_transitions(); } | 84 inline int number_of_entries() { return number_of_transitions(); } |
74 | 85 |
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92 // Allocates a TransitionArray. | 103 // Allocates a TransitionArray. |
93 MUST_USE_RESULT static MaybeObject* Allocate(int number_of_transitions); | 104 MUST_USE_RESULT static MaybeObject* Allocate(int number_of_transitions); |
94 | 105 |
95 // Casting. | 106 // Casting. |
96 static inline TransitionArray* cast(Object* obj); | 107 static inline TransitionArray* cast(Object* obj); |
97 | 108 |
98 // Constant for denoting key was not found. | 109 // Constant for denoting key was not found. |
99 static const int kNotFound = -1; | 110 static const int kNotFound = -1; |
100 | 111 |
101 static const int kElementsTransitionIndex = 0; | 112 static const int kElementsTransitionIndex = 0; |
102 static const int kFirstIndex = 1; | 113 static const int kPrototypeTransitionsIndex = 1; |
114 static const int kFirstIndex = 2; | |
103 | 115 |
104 // Layout transition array header. | 116 // Layout transition array header. |
105 static const int kElementsTransitionOffset = FixedArray::kHeaderSize; | 117 static const int kElementsTransitionOffset = FixedArray::kHeaderSize; |
106 static const int kFirstOffset = kElementsTransitionOffset + kPointerSize; | 118 static const int kPrototypeTransitionsOffset = kElementsTransitionOffset + |
119 kPointerSize; | |
120 static const int kFirstOffset = kPrototypeTransitionsOffset + kPointerSize; | |
107 | 121 |
108 // Layout of map transition. | 122 // Layout of map transition. |
109 static const int kTransitionKey = 0; | 123 static const int kTransitionKey = 0; |
110 static const int kTransitionValue = 1; | 124 static const int kTransitionValue = 1; |
111 static const int kTransitionSize = 2; | 125 static const int kTransitionSize = 2; |
112 | 126 |
113 #ifdef OBJECT_PRINT | 127 #ifdef OBJECT_PRINT |
114 // Print all the transitions. | 128 // Print all the transitions. |
115 inline void PrintTransitions() { | 129 inline void PrintTransitions() { |
116 PrintTransitions(stdout); | 130 PrintTransitions(stdout); |
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147 Object* value, | 161 Object* value, |
148 const WhitenessWitness&); | 162 const WhitenessWitness&); |
149 | 163 |
150 DISALLOW_IMPLICIT_CONSTRUCTORS(TransitionArray); | 164 DISALLOW_IMPLICIT_CONSTRUCTORS(TransitionArray); |
151 }; | 165 }; |
152 | 166 |
153 | 167 |
154 } } // namespace v8::internal | 168 } } // namespace v8::internal |
155 | 169 |
156 #endif // V8_TRANSITIONS_H_ | 170 #endif // V8_TRANSITIONS_H_ |
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