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 IsFullTransitionArray() &&
  73       get(kElementsTransitionIndex) != Smi::FromInt(0);
  74 }
  75
  76
  77 void TransitionArray::set_elements_transition(Map* transition_map,
  78                                               WriteBarrierMode mode) {
  79   ASSERT(IsFullTransitionArray());
  80   Heap* heap = GetHeap();
  81   WRITE_FIELD(this, kElementsTransitionOffset, transition_map);
  82   CONDITIONAL_WRITE_BARRIER(
  83       heap, this, kElementsTransitionOffset, transition_map, mode);
  84 }
  85
  86
  87 Object* TransitionArray::back_pointer_storage() {
  88   return get(kBackPointerStorageIndex);
  89 }
  90
  91
  92 void TransitionArray::set_back_pointer_storage(Object* back_pointer,
  93                                                WriteBarrierMode mode) {
  94   Heap* heap = GetHeap();
  95   WRITE_FIELD(this, kBackPointerStorageOffset, back_pointer);
  96   CONDITIONAL_WRITE_BARRIER(
  97       heap, this, kBackPointerStorageOffset, back_pointer, mode);
  98 }
  99
 100
 101 bool TransitionArray::HasPrototypeTransitions() {
 102   return IsFullTransitionArray() &&
 103       get(kPrototypeTransitionsIndex) != Smi::FromInt(0);
 104 }
 105
 106
 107 FixedArray* TransitionArray::GetPrototypeTransitions() {
 108   ASSERT(IsFullTransitionArray());
 109   Object* prototype_transitions = get(kPrototypeTransitionsIndex);
 110   return FixedArray::cast(prototype_transitions);
 111 }
 112
 113
 114 HeapObject* TransitionArray::UncheckedPrototypeTransitions() {
 115   ASSERT(HasPrototypeTransitions());
 116   return reinterpret_cast<HeapObject*>(get(kPrototypeTransitionsIndex));
 117 }
 118
 119
 120 void TransitionArray::SetPrototypeTransitions(FixedArray* transitions,
 121                                               WriteBarrierMode mode) {
 122   ASSERT(IsFullTransitionArray());
 123   ASSERT(transitions->IsFixedArray());
 124   Heap* heap = GetHeap();
 125   WRITE_FIELD(this, kPrototypeTransitionsOffset, transitions);
 126   CONDITIONAL_WRITE_BARRIER(
 127       heap, this, kPrototypeTransitionsOffset, transitions, mode);
 128 }
 129
 130
 131 Object** TransitionArray::GetPrototypeTransitionsSlot() {
 132   return HeapObject::RawField(reinterpret_cast<HeapObject*>(this),
 133                               kPrototypeTransitionsOffset);
 134 }
 135
 136
 137 Object** TransitionArray::GetKeySlot(int transition_number) {
 138   ASSERT(!IsSimpleTransition());
 139   ASSERT(transition_number < number_of_transitions());
 140   return HeapObject::RawField(
 141       reinterpret_cast<HeapObject*>(this),
 142       OffsetOfElementAt(ToKeyIndex(transition_number)));
 143 }
 144
 145
 146 String* TransitionArray::GetKey(int transition_number) {
 147   if (IsSimpleTransition()) {
 148     Map* target = GetTarget(kSimpleTransitionIndex);
 149     int descriptor = target->LastAdded();
 150     String* key = target->instance_descriptors()->GetKey(descriptor);
 151     return key;
 152   }
 153   ASSERT(transition_number < number_of_transitions());
 154   return String::cast(get(ToKeyIndex(transition_number)));
 155 }
 156
 157
 158 void TransitionArray::SetKey(int transition_number, String* key) {
 159   ASSERT(!IsSimpleTransition());
 160   ASSERT(transition_number < number_of_transitions());
 161   set(ToKeyIndex(transition_number), key);
 162 }
 163
 164
 165 Map* TransitionArray::GetTarget(int transition_number) {
 166   if (IsSimpleTransition()) {
 167     ASSERT(transition_number == kSimpleTransitionIndex);
 168     return Map::cast(get(kSimpleTransitionTarget));
 169   }
 170   ASSERT(transition_number < number_of_transitions());
 171   return Map::cast(get(ToTargetIndex(transition_number)));
 172 }
 173
 174
 175 void TransitionArray::SetTarget(int transition_number, Map* value) {
 176   if (IsSimpleTransition()) {
 177     ASSERT(transition_number == kSimpleTransitionIndex);
 178     return set(kSimpleTransitionTarget, value);
 179   }
 180   ASSERT(transition_number < number_of_transitions());
 181   set(ToTargetIndex(transition_number), value);
 182 }
 183
 184
 185 PropertyDetails TransitionArray::GetTargetDetails(int transition_number) {
 186   Map* map = GetTarget(transition_number);
 187   DescriptorArray* descriptors = map->instance_descriptors();
 188   int descriptor = map->LastAdded();
 189   return descriptors->GetDetails(descriptor);
 190 }
 191
 192
 193 int TransitionArray::Search(String* name) {
 194   return internal::Search<ALL_ENTRIES>(this, name);
 195 }
 196
 197
 198 void TransitionArray::NoIncrementalWriteBarrierSet(int transition_number,
 199                                                    String* key,
 200                                                    Map* target) {
 201   FixedArray::NoIncrementalWriteBarrierSet(
 202       this, ToKeyIndex(transition_number), key);
 203   FixedArray::NoIncrementalWriteBarrierSet(
 204       this, ToTargetIndex(transition_number), target);
 205 }
 206
 207
 208 #undef FIELD_ADDR
 209 #undef WRITE_FIELD
 210 #undef CONDITIONAL_WRITE_BARRIER
 211
 212
 213 } }  // namespace v8::internal
 214
 215 #endif  // V8_TRANSITIONS_INL_H_