yangguo@chromium.org | 99aa490 | 2012-07-06 16:21:55 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include "v8.h" |
| 29 | |
| 30 | #include "objects.h" |
| 31 | #include "transitions-inl.h" |
| 32 | #include "utils.h" |
| 33 | |
| 34 | namespace v8 { |
| 35 | namespace internal { |
| 36 | |
| 37 | |
| 38 | MaybeObject* TransitionArray::Allocate(int number_of_transitions) { |
| 39 | Heap* heap = Isolate::Current()->heap(); |
| 40 | // Use FixedArray to not use DescriptorArray::cast on incomplete object. |
| 41 | FixedArray* array; |
| 42 | { MaybeObject* maybe_array = |
| 43 | heap->AllocateFixedArray(ToKeyIndex(number_of_transitions)); |
| 44 | if (!maybe_array->To(&array)) return maybe_array; |
| 45 | } |
| 46 | |
| 47 | array->set(kElementsTransitionIndex, Smi::FromInt(0)); |
danno@chromium.org | 81cac2b | 2012-07-10 11:28:27 +0000 | [diff] [blame] | 48 | array->set(kPrototypeTransitionsIndex, Smi::FromInt(0)); |
yangguo@chromium.org | 99aa490 | 2012-07-06 16:21:55 +0000 | [diff] [blame] | 49 | return array; |
| 50 | } |
| 51 | |
| 52 | |
| 53 | void TransitionArray::CopyFrom(TransitionArray* origin, |
| 54 | int origin_transition, |
| 55 | int target_transition, |
| 56 | const WhitenessWitness& witness) { |
verwaest@chromium.org | 753aee4 | 2012-07-17 16:15:42 +0000 | [diff] [blame^] | 57 | Set(target_transition, |
| 58 | origin->GetKey(origin_transition), |
| 59 | origin->GetTarget(origin_transition), |
| 60 | witness); |
yangguo@chromium.org | 99aa490 | 2012-07-06 16:21:55 +0000 | [diff] [blame] | 61 | } |
| 62 | |
| 63 | |
| 64 | static bool InsertionPointFound(String* key1, String* key2) { |
| 65 | return key1->Hash() > key2->Hash(); |
| 66 | } |
| 67 | |
| 68 | |
verwaest@chromium.org | 753aee4 | 2012-07-17 16:15:42 +0000 | [diff] [blame^] | 69 | MaybeObject* TransitionArray::NewWith(String* name, Map* target) { |
yangguo@chromium.org | 99aa490 | 2012-07-06 16:21:55 +0000 | [diff] [blame] | 70 | TransitionArray* result; |
| 71 | |
| 72 | { MaybeObject* maybe_array; |
| 73 | maybe_array = TransitionArray::Allocate(1); |
| 74 | if (!maybe_array->To(&result)) return maybe_array; |
| 75 | } |
| 76 | |
| 77 | FixedArray::WhitenessWitness witness(result); |
| 78 | |
verwaest@chromium.org | 753aee4 | 2012-07-17 16:15:42 +0000 | [diff] [blame^] | 79 | result->Set(0, name, target, witness); |
yangguo@chromium.org | 99aa490 | 2012-07-06 16:21:55 +0000 | [diff] [blame] | 80 | return result; |
| 81 | } |
| 82 | |
| 83 | |
verwaest@chromium.org | 753aee4 | 2012-07-17 16:15:42 +0000 | [diff] [blame^] | 84 | MaybeObject* TransitionArray::CopyInsert(String* name, Map* target) { |
yangguo@chromium.org | 99aa490 | 2012-07-06 16:21:55 +0000 | [diff] [blame] | 85 | TransitionArray* result; |
| 86 | |
| 87 | int number_of_transitions = this->number_of_transitions(); |
| 88 | int new_size = number_of_transitions; |
| 89 | |
| 90 | int insertion_index = this->Search(name); |
| 91 | if (insertion_index == kNotFound) ++new_size; |
| 92 | |
verwaest@chromium.org | 753aee4 | 2012-07-17 16:15:42 +0000 | [diff] [blame^] | 93 | MaybeObject* maybe_array; |
| 94 | maybe_array = TransitionArray::Allocate(new_size); |
| 95 | if (!maybe_array->To(&result)) return maybe_array; |
yangguo@chromium.org | 99aa490 | 2012-07-06 16:21:55 +0000 | [diff] [blame] | 96 | |
| 97 | if (HasElementsTransition()) { |
| 98 | result->set_elements_transition(elements_transition()); |
| 99 | } |
| 100 | |
danno@chromium.org | 81cac2b | 2012-07-10 11:28:27 +0000 | [diff] [blame] | 101 | if (HasPrototypeTransitions()) { |
| 102 | result->SetPrototypeTransitions(GetPrototypeTransitions()); |
| 103 | } |
| 104 | |
yangguo@chromium.org | 99aa490 | 2012-07-06 16:21:55 +0000 | [diff] [blame] | 105 | FixedArray::WhitenessWitness witness(result); |
| 106 | |
| 107 | if (insertion_index != kNotFound) { |
| 108 | for (int i = 0; i < number_of_transitions; ++i) { |
| 109 | if (i != insertion_index) result->CopyFrom(this, i, i, witness); |
| 110 | } |
verwaest@chromium.org | 753aee4 | 2012-07-17 16:15:42 +0000 | [diff] [blame^] | 111 | result->Set(insertion_index, name, target, witness); |
yangguo@chromium.org | 99aa490 | 2012-07-06 16:21:55 +0000 | [diff] [blame] | 112 | return result; |
| 113 | } |
| 114 | |
| 115 | insertion_index = 0; |
| 116 | for (; insertion_index < number_of_transitions; ++insertion_index) { |
| 117 | if (InsertionPointFound(GetKey(insertion_index), name)) break; |
| 118 | result->CopyFrom(this, insertion_index, insertion_index, witness); |
| 119 | } |
| 120 | |
verwaest@chromium.org | 753aee4 | 2012-07-17 16:15:42 +0000 | [diff] [blame^] | 121 | result->Set(insertion_index, name, target, witness); |
yangguo@chromium.org | 99aa490 | 2012-07-06 16:21:55 +0000 | [diff] [blame] | 122 | |
| 123 | for (; insertion_index < number_of_transitions; ++insertion_index) { |
| 124 | result->CopyFrom(this, insertion_index, insertion_index + 1, witness); |
| 125 | } |
| 126 | |
| 127 | return result; |
| 128 | } |
| 129 | |
| 130 | |
| 131 | } } // namespace v8::internal |