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Issue 10816005: Swapped transition array and descriptor array. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Addressed comments, and updated additional code comments. Created 8 years, 4 months ago
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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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32 #include "utils.h" 32 #include "utils.h"
33 33
34 namespace v8 { 34 namespace v8 {
35 namespace internal { 35 namespace internal {
36 36
37 37
38 MaybeObject* TransitionArray::Allocate(int number_of_transitions) { 38 MaybeObject* TransitionArray::Allocate(int number_of_transitions) {
39 Heap* heap = Isolate::Current()->heap(); 39 Heap* heap = Isolate::Current()->heap();
40 // Use FixedArray to not use DescriptorArray::cast on incomplete object. 40 // Use FixedArray to not use DescriptorArray::cast on incomplete object.
41 FixedArray* array; 41 FixedArray* array;
42 { MaybeObject* maybe_array = 42 MaybeObject* maybe_array =
43 heap->AllocateFixedArray(ToKeyIndex(number_of_transitions)); 43 heap->AllocateFixedArray(ToKeyIndex(number_of_transitions));
44 if (!maybe_array->To(&array)) return maybe_array; 44 if (!maybe_array->To(&array)) return maybe_array;
45 }
46 45
47 array->set(kElementsTransitionIndex, Smi::FromInt(0)); 46 array->set(kElementsTransitionIndex, Smi::FromInt(0));
48 array->set(kPrototypeTransitionsIndex, Smi::FromInt(0)); 47 array->set(kPrototypeTransitionsIndex, Smi::FromInt(0));
49 return array; 48 return array;
50 } 49 }
51 50
52 51
53 void TransitionArray::CopyFrom(TransitionArray* origin, 52 void TransitionArray::CopyFrom(TransitionArray* origin,
54 int origin_transition, 53 int origin_transition,
55 int target_transition, 54 int target_transition,
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120 119
121 for (; insertion_index < number_of_transitions; ++insertion_index) { 120 for (; insertion_index < number_of_transitions; ++insertion_index) {
122 result->CopyFrom(this, insertion_index, insertion_index + 1, witness); 121 result->CopyFrom(this, insertion_index, insertion_index + 1, witness);
123 } 122 }
124 123
125 return result; 124 return result;
126 } 125 }
127 126
128 127
129 } } // namespace v8::internal 128 } } // namespace v8::internal
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