src/transitions-inl.h

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  27
  28 #ifndef V8_TRANSITIONS_INL_H_
  29 #define V8_TRANSITIONS_INL_H_
  30
  31 #include "objects-inl.h"
  32 #include "transitions.h"
  33
  34 namespace v8 {
  35 namespace internal {
  36
  37
  38 #define FIELD_ADDR(p, offset) \
  39   (reinterpret_cast<byte*>(p) + offset - kHeapObjectTag)
  40
  41 #define WRITE_FIELD(p, offset, value) \
  42   (*reinterpret_cast<Object**>(FIELD_ADDR(p, offset)) = value)
  43
  44 #define CONDITIONAL_WRITE_BARRIER(heap, object, offset, value, mode)    \
  45   if (mode == UPDATE_WRITE_BARRIER) {                                   \
  46     heap->incremental_marking()->RecordWrite(                           \
  47       object, HeapObject::RawField(object, offset), value);             \
  48     if (heap->InNewSpace(value)) {                                      \
  49       heap->RecordWrite(object->address(), offset);                     \
  50     }                                                                   \
  51   }
  52
  53
  54 TransitionArray* TransitionArray::cast(Object* object) {
  55   ASSERT(object->IsTransitionArray());
  56   return reinterpret_cast<TransitionArray*>(object);
  57 }
  58
  59
  60 Map* TransitionArray::elements_transition() {
  61   Object* transition_map = get(kElementsTransitionIndex);
  62   return Map::cast(transition_map);
  63 }
  64
  65
  66 void TransitionArray::ClearElementsTransition() {
  67   WRITE_FIELD(this, kElementsTransitionOffset, Smi::FromInt(0));
  68 }
  69
  70
  71 bool TransitionArray::HasElementsTransition() {
  72   return get(kElementsTransitionIndex) != Smi::FromInt(0);
  73 }
  74
  75
  76 void TransitionArray::set_elements_transition(Map* transition_map,
  77                                               WriteBarrierMode mode) {
  78   Heap* heap = GetHeap();
  79   WRITE_FIELD(this, kElementsTransitionOffset, transition_map);
  80   CONDITIONAL_WRITE_BARRIER(
  81       heap, this, kElementsTransitionOffset, transition_map, mode);
  82 }
  83
  84
  85 DescriptorArray* TransitionArray::descriptors() {
  86   return DescriptorArray::cast(descriptors_pointer()->value());
  87 }
  88
  89
  90 void TransitionArray::set_descriptors(DescriptorArray* descriptors) {
  91   ASSERT(!this->descriptors()->IsDescriptorArray() ||
  92          descriptors->number_of_descriptors() == 0 ||
  93          descriptors->HasEnumCache() ||
  94          !this->descriptors()->HasEnumCache());
  95   descriptors_pointer()->set_value(descriptors);
  96 }
  97
  98
  99 JSGlobalPropertyCell* TransitionArray::descriptors_pointer() {
 100   return JSGlobalPropertyCell::cast(get(kDescriptorsPointerIndex));
 101 }
 102
 103
 104 void TransitionArray::set_descriptors_pointer(JSGlobalPropertyCell* pointer) {
 105   set(kDescriptorsPointerIndex, pointer);
 106 }
 107
 108
 109 Object* TransitionArray::back_pointer_storage() {
 110   return get(kBackPointerStorageIndex);
 111 }
 112
 113
 114 void TransitionArray::set_back_pointer_storage(Object* back_pointer,
 115                                                WriteBarrierMode mode) {
 116   Heap* heap = GetHeap();
 117   WRITE_FIELD(this, kBackPointerStorageOffset, back_pointer);
 118   CONDITIONAL_WRITE_BARRIER(
 119       heap, this, kBackPointerStorageOffset, back_pointer, mode);
 120 }
 121
 122
 123 bool TransitionArray::HasPrototypeTransitions() {
 124   Object* prototype_transitions = get(kPrototypeTransitionsIndex);
 125   return prototype_transitions != Smi::FromInt(0);
 126 }
 127
 128
 129 FixedArray* TransitionArray::GetPrototypeTransitions() {
 130   Object* prototype_transitions = get(kPrototypeTransitionsIndex);
 131   return FixedArray::cast(prototype_transitions);
 132 }
 133
 134
 135 HeapObject* TransitionArray::UncheckedPrototypeTransitions() {
 136   ASSERT(HasPrototypeTransitions());
 137   return reinterpret_cast<HeapObject*>(get(kPrototypeTransitionsIndex));
 138 }
 139
 140
 141 void TransitionArray::SetPrototypeTransitions(FixedArray* transitions,
 142                                               WriteBarrierMode mode) {
 143   ASSERT(this != NULL);
 144   ASSERT(transitions->IsFixedArray());
 145   Heap* heap = GetHeap();
 146   WRITE_FIELD(this, kPrototypeTransitionsOffset, transitions);
 147   CONDITIONAL_WRITE_BARRIER(
 148       heap, this, kPrototypeTransitionsOffset, transitions, mode);
 149 }
 150
 151
 152 Object** TransitionArray::GetPrototypeTransitionsSlot() {
 153   return HeapObject::RawField(reinterpret_cast<HeapObject*>(this),
 154                               kPrototypeTransitionsOffset);
 155 }
 156
 157
 158 Object** TransitionArray::GetKeySlot(int transition_number) {
 159   ASSERT(transition_number < number_of_transitions());
 160   return HeapObject::RawField(
 161       reinterpret_cast<HeapObject*>(this),
 162       OffsetOfElementAt(ToKeyIndex(transition_number)));
 163 }
 164
 165
 166 String* TransitionArray::GetKey(int transition_number) {
 167   ASSERT(transition_number < number_of_transitions());
 168   return String::cast(get(ToKeyIndex(transition_number)));
 169 }
 170
 171
 172 void TransitionArray::SetKey(int transition_number, String* key) {
 173   ASSERT(transition_number < number_of_transitions());
 174   set(ToKeyIndex(transition_number), key);
 175 }
 176
 177
 178 Map* TransitionArray::GetTarget(int transition_number) {
 179   ASSERT(transition_number < number_of_transitions());
 180   return Map::cast(get(ToTargetIndex(transition_number)));
 181 }
 182
 183
 184 void TransitionArray::SetTarget(int transition_number, Map* value) {
 185   ASSERT(transition_number < number_of_transitions());
 186   set(ToTargetIndex(transition_number), value);
 187 }
 188
 189
 190 PropertyDetails TransitionArray::GetTargetDetails(int transition_number) {
 191   Map* map = GetTarget(transition_number);
 192   DescriptorArray* descriptors = map->instance_descriptors();
 193   int descriptor = map->LastAdded();
 194   return descriptors->GetDetails(descriptor);
 195 }
 196
 197
 198 int TransitionArray::Search(String* name) {
 199   return internal::Search<ALL_ENTRIES>(this, name);
 200 }
 201
 202
 203 void TransitionArray::NoIncrementalWriteBarrierSet(int transition_number,
 204                                                    String* key,
 205                                                    Map* target) {
 206   FixedArray::NoIncrementalWriteBarrierSet(
 207       this, ToKeyIndex(transition_number), key);
 208   FixedArray::NoIncrementalWriteBarrierSet(
 209       this, ToTargetIndex(transition_number), target);
 210 }
 211
 212
 213 #undef FIELD_ADDR
 214 #undef WRITE_FIELD
 215 #undef CONDITIONAL_WRITE_BARRIER
 216
 217
 218 } }  // namespace v8::internal
 219
 220 #endif  // V8_TRANSITIONS_INL_H_