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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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3646 ASSERT(undefined->IsUndefined()); | 3646 ASSERT(undefined->IsUndefined()); |
3647 WRITE_FIELD(this, kInstanceDescriptorsOrBackPointerOffset, undefined); | 3647 WRITE_FIELD(this, kInstanceDescriptorsOrBackPointerOffset, undefined); |
3648 } | 3648 } |
3649 | 3649 |
3650 | 3650 |
3651 void Map::SetBackPointer(Object* value, WriteBarrierMode mode) { | 3651 void Map::SetBackPointer(Object* value, WriteBarrierMode mode) { |
3652 ASSERT(instance_type() >= FIRST_JS_RECEIVER_TYPE); | 3652 ASSERT(instance_type() >= FIRST_JS_RECEIVER_TYPE); |
3653 ASSERT((value->IsUndefined() && GetBackPointer()->IsMap()) || | 3653 ASSERT((value->IsUndefined() && GetBackPointer()->IsMap()) || |
3654 (value->IsMap() && GetBackPointer()->IsUndefined())); | 3654 (value->IsMap() && GetBackPointer()->IsUndefined())); |
3655 Object* object = READ_FIELD(this, kInstanceDescriptorsOrBackPointerOffset); | 3655 Object* object = READ_FIELD(this, kInstanceDescriptorsOrBackPointerOffset); |
3656 if (object->IsMap()) { | 3656 if (object->IsDescriptorArray()) { |
| 3657 DescriptorArray::cast(object)->set_back_pointer_storage(value); |
| 3658 } else { |
3657 WRITE_FIELD(this, kInstanceDescriptorsOrBackPointerOffset, value); | 3659 WRITE_FIELD(this, kInstanceDescriptorsOrBackPointerOffset, value); |
3658 CONDITIONAL_WRITE_BARRIER( | 3660 CONDITIONAL_WRITE_BARRIER( |
3659 GetHeap(), this, kInstanceDescriptorsOrBackPointerOffset, value, mode); | 3661 GetHeap(), this, kInstanceDescriptorsOrBackPointerOffset, value, mode); |
3660 } else { | |
3661 DescriptorArray::cast(object)->set_back_pointer_storage(value); | |
3662 } | 3662 } |
3663 } | 3663 } |
3664 | 3664 |
3665 | 3665 |
3666 // Can either be Smi (no transitions), normal transition array, or a transition | 3666 // Can either be Smi (no transitions), normal transition array, or a transition |
3667 // array with the header overwritten as a Smi (thus iterating). | 3667 // array with the header overwritten as a Smi (thus iterating). |
3668 TransitionArray* Map::unchecked_transition_array() { | 3668 TransitionArray* Map::unchecked_transition_array() { |
3669 ASSERT(HasTransitionArray()); | 3669 ASSERT(HasTransitionArray()); |
3670 Object* object = *HeapObject::RawField(instance_descriptors(), | 3670 Object* object = *HeapObject::RawField(instance_descriptors(), |
3671 DescriptorArray::kTransitionsOffset); | 3671 DescriptorArray::kTransitionsOffset); |
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4294 | 4294 |
4295 Map* current_map = initial_map; | 4295 Map* current_map = initial_map; |
4296 ElementsKind kind = current_map->elements_kind(); | 4296 ElementsKind kind = current_map->elements_kind(); |
4297 ASSERT(kind == GetInitialFastElementsKind()); | 4297 ASSERT(kind == GetInitialFastElementsKind()); |
4298 maps->set(kind, current_map); | 4298 maps->set(kind, current_map); |
4299 for (int i = GetSequenceIndexFromFastElementsKind(kind) + 1; | 4299 for (int i = GetSequenceIndexFromFastElementsKind(kind) + 1; |
4300 i < kFastElementsKindCount; ++i) { | 4300 i < kFastElementsKindCount; ++i) { |
4301 Map* new_map; | 4301 Map* new_map; |
4302 ElementsKind next_kind = GetFastElementsKindFromSequenceIndex(i); | 4302 ElementsKind next_kind = GetFastElementsKindFromSequenceIndex(i); |
4303 MaybeObject* maybe_new_map = | 4303 MaybeObject* maybe_new_map = |
4304 current_map->CreateNextElementsTransition(next_kind); | 4304 current_map->CopyAsElementsKind(next_kind, INSERT_TRANSITION); |
4305 if (!maybe_new_map->To(&new_map)) return maybe_new_map; | 4305 if (!maybe_new_map->To(&new_map)) return maybe_new_map; |
4306 maps->set(next_kind, new_map); | 4306 maps->set(next_kind, new_map); |
4307 current_map = new_map; | 4307 current_map = new_map; |
4308 } | 4308 } |
4309 global_context->set_js_array_maps(maps); | 4309 global_context->set_js_array_maps(maps); |
4310 } | 4310 } |
4311 set_initial_map(initial_map); | 4311 set_initial_map(initial_map); |
4312 return this; | 4312 return this; |
4313 } | 4313 } |
4314 | 4314 |
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5322 #undef WRITE_UINT32_FIELD | 5322 #undef WRITE_UINT32_FIELD |
5323 #undef READ_SHORT_FIELD | 5323 #undef READ_SHORT_FIELD |
5324 #undef WRITE_SHORT_FIELD | 5324 #undef WRITE_SHORT_FIELD |
5325 #undef READ_BYTE_FIELD | 5325 #undef READ_BYTE_FIELD |
5326 #undef WRITE_BYTE_FIELD | 5326 #undef WRITE_BYTE_FIELD |
5327 | 5327 |
5328 | 5328 |
5329 } } // namespace v8::internal | 5329 } } // namespace v8::internal |
5330 | 5330 |
5331 #endif // V8_OBJECTS_INL_H_ | 5331 #endif // V8_OBJECTS_INL_H_ |
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