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1 // Copyright 2014 the V8 project authors. All rights reserved. | 1 // Copyright 2014 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_FIELD_INDEX_INL_H_ | 5 #ifndef V8_FIELD_INDEX_INL_H_ |
6 #define V8_FIELD_INDEX_INL_H_ | 6 #define V8_FIELD_INDEX_INL_H_ |
7 | 7 |
8 #include "src/field-index.h" | 8 #include "src/field-index.h" |
9 #include "src/ic/handler-configuration.h" | 9 #include "src/ic/handler-configuration.h" |
10 | 10 |
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78 if (is_inobject()) { | 78 if (is_inobject()) { |
79 result -= JSObject::kHeaderSize / kPointerSize; | 79 result -= JSObject::kHeaderSize / kPointerSize; |
80 } else { | 80 } else { |
81 result -= FixedArray::kHeaderSize / kPointerSize; | 81 result -= FixedArray::kHeaderSize / kPointerSize; |
82 result = -result - 1; | 82 result = -result - 1; |
83 } | 83 } |
84 result <<= 1; | 84 result <<= 1; |
85 return is_double() ? (result | 1) : result; | 85 return is_double() ? (result | 1) : result; |
86 } | 86 } |
87 | 87 |
88 // Takes an offset as computed by GetLoadByFieldOffset and reconstructs a | |
89 // FieldIndex object from it. | |
90 // static | |
91 inline FieldIndex FieldIndex::ForLoadByFieldOffset(Map* map, int offset) { | |
92 DCHECK(LoadHandlerTypeBit::decode(offset) == kLoadICHandlerForProperties); | |
93 bool is_inobject = FieldOffsetIsInobject::decode(offset); | |
94 bool is_double = FieldOffsetIsDouble::decode(offset); | |
95 int field_index = FieldOffsetOffset::decode(offset) >> kPointerSizeLog2; | |
96 int first_inobject_offset = 0; | |
97 if (is_inobject) { | |
98 first_inobject_offset = | |
99 map->IsJSObjectMap() ? map->GetInObjectPropertyOffset(0) : 0; | |
100 } else { | |
101 first_inobject_offset = FixedArray::kHeaderSize; | |
102 } | |
103 int inobject_properties = | |
104 map->IsJSObjectMap() ? map->GetInObjectProperties() : 0; | |
105 FieldIndex result(is_inobject, field_index, is_double, inobject_properties, | |
106 first_inobject_offset); | |
107 DCHECK(result.GetLoadByFieldOffset() == offset); | |
108 return result; | |
109 } | |
110 | |
111 // Returns the offset format consumed by TurboFan stubs: | 88 // Returns the offset format consumed by TurboFan stubs: |
112 // (offset << 3) | (is_double << 2) | (is_inobject << 1) | is_property | 89 // (offset << 3) | (is_double << 2) | (is_inobject << 1) | is_property |
113 // Where |offset| is relative to object start or FixedArray start, respectively. | 90 // Where |offset| is relative to object start or FixedArray start, respectively. |
114 inline int FieldIndex::GetLoadByFieldOffset() const { | 91 inline int FieldIndex::GetLoadByFieldOffset() const { |
115 return FieldOffsetIsInobject::encode(is_inobject()) | | 92 return FieldOffsetIsInobject::encode(is_inobject()) | |
116 FieldOffsetIsDouble::encode(is_double()) | | 93 FieldOffsetIsDouble::encode(is_double()) | |
117 FieldOffsetOffset::encode(index() << kPointerSizeLog2) | | 94 FieldOffsetOffset::encode(index() << kPointerSizeLog2) | |
118 LoadHandlerTypeBit::encode(kLoadICHandlerForProperties); | 95 LoadHandlerTypeBit::encode(kLoadICHandlerForProperties); |
119 } | 96 } |
120 | 97 |
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147 } else { | 124 } else { |
148 return property_index(); | 125 return property_index(); |
149 } | 126 } |
150 } | 127 } |
151 | 128 |
152 | 129 |
153 } // namespace internal | 130 } // namespace internal |
154 } // namespace v8 | 131 } // namespace v8 |
155 | 132 |
156 #endif | 133 #endif |
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