| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| |
| #include "objects.h" |
| #include "transitions-inl.h" |
| #include "utils.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| MaybeObject* TransitionArray::Allocate(int number_of_transitions) { |
| Heap* heap = Isolate::Current()->heap(); |
| // Use FixedArray to not use DescriptorArray::cast on incomplete object. |
| FixedArray* array; |
| { MaybeObject* maybe_array = |
| heap->AllocateFixedArray(ToKeyIndex(number_of_transitions)); |
| if (!maybe_array->To(&array)) return maybe_array; |
| } |
| |
| array->set(kElementsTransitionIndex, Smi::FromInt(0)); |
| array->set(kPrototypeTransitionsIndex, Smi::FromInt(0)); |
| return array; |
| } |
| |
| |
| void TransitionArray::CopyFrom(TransitionArray* origin, |
| int origin_transition, |
| int target_transition, |
| const WhitenessWitness& witness) { |
| this->Set(target_transition, |
| origin->GetKey(origin_transition), |
| origin->GetValue(origin_transition), |
| witness); |
| } |
| |
| |
| static bool InsertionPointFound(String* key1, String* key2) { |
| return key1->Hash() > key2->Hash(); |
| } |
| |
| |
| MaybeObject* TransitionArray::NewWith(String* name, Object* value) { |
| TransitionArray* result; |
| |
| { MaybeObject* maybe_array; |
| maybe_array = TransitionArray::Allocate(1); |
| if (!maybe_array->To(&result)) return maybe_array; |
| } |
| |
| FixedArray::WhitenessWitness witness(result); |
| |
| result->Set(0, name, value, witness); |
| return result; |
| } |
| |
| |
| MaybeObject* TransitionArray::CopyInsert(String* name, Object* value) { |
| TransitionArray* result; |
| |
| int number_of_transitions = this->number_of_transitions(); |
| int new_size = number_of_transitions; |
| |
| int insertion_index = this->Search(name); |
| if (insertion_index == kNotFound) ++new_size; |
| |
| { MaybeObject* maybe_array; |
| maybe_array = TransitionArray::Allocate(new_size); |
| if (!maybe_array->To(&result)) return maybe_array; |
| } |
| |
| if (HasElementsTransition()) { |
| result->set_elements_transition(elements_transition()); |
| } |
| |
| if (HasPrototypeTransitions()) { |
| result->SetPrototypeTransitions(GetPrototypeTransitions()); |
| } |
| |
| FixedArray::WhitenessWitness witness(result); |
| |
| if (insertion_index != kNotFound) { |
| for (int i = 0; i < number_of_transitions; ++i) { |
| if (i != insertion_index) result->CopyFrom(this, i, i, witness); |
| } |
| result->Set(insertion_index, name, value, witness); |
| return result; |
| } |
| |
| insertion_index = 0; |
| for (; insertion_index < number_of_transitions; ++insertion_index) { |
| if (InsertionPointFound(GetKey(insertion_index), name)) break; |
| result->CopyFrom(this, insertion_index, insertion_index, witness); |
| } |
| |
| result->Set(insertion_index, name, value, witness); |
| |
| for (; insertion_index < number_of_transitions; ++insertion_index) { |
| result->CopyFrom(this, insertion_index, insertion_index + 1, witness); |
| } |
| |
| return result; |
| } |
| |
| |
| } } // namespace v8::internal |