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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_H_ | 5 #ifndef V8_FIELD_INDEX_H_ |
6 #define V8_FIELD_INDEX_H_ | 6 #define V8_FIELD_INDEX_H_ |
7 | 7 |
8 #include "src/utils.h" | 8 #include "src/utils.h" |
9 #include "src/property-details.h" | 9 #include "src/property-details.h" |
10 | 10 |
11 namespace v8 { | 11 namespace v8 { |
12 namespace internal { | 12 namespace internal { |
13 | 13 |
14 class Map; | 14 class Map; |
15 | 15 |
16 // Wrapper class to hold a field index, usually but not necessarily generated | 16 // Wrapper class to hold a field index, usually but not necessarily generated |
17 // from a property index. When available, the wrapper class captures additional | 17 // from a property index. When available, the wrapper class captures additional |
18 // information to allow the field index to be translated back into the property | 18 // information to allow the field index to be translated back into the property |
19 // index it was originally generated from. | 19 // index it was originally generated from. |
20 class FieldIndex V8_FINAL { | 20 class FieldIndex V8_FINAL { |
21 public: | 21 public: |
22 static FieldIndex ForPropertyIndex(Map* map, | 22 static FieldIndex ForPropertyIndex(Map* map, |
23 int index, | 23 int index, |
24 bool is_double = false); | 24 bool is_double = false); |
25 static FieldIndex ForInObjectOffset(int offset, Map* map = NULL); | 25 static FieldIndex ForInObjectOffset(int offset, Map* map = NULL); |
26 static FieldIndex ForLookupResult(const LookupResult* result); | 26 static FieldIndex ForLookupResult(const LookupResult* result); |
27 static FieldIndex ForDescriptor(Map* map, int descriptor_index); | 27 static FieldIndex ForDescriptor(Map* map, int descriptor_index); |
28 static FieldIndex ForLoadByFieldIndex(Map* map, int index); | 28 static FieldIndex ForLoadByFieldIndex(Map* map, int index); |
29 static FieldIndex ForKeyedLookupCacheIndex(Map* map, int index) { | 29 static FieldIndex ForKeyedLookupCacheIndex(Map* map, int index); |
30 return ForPropertyIndex(map, index); | |
31 } | |
32 | 30 |
33 bool is_inobject() const { | 31 bool is_inobject() const { |
34 return IsInObjectBits::decode(bit_field_); | 32 return IsInObjectBits::decode(bit_field_); |
35 } | 33 } |
36 | 34 |
37 bool is_double() const { | 35 bool is_double() const { |
38 return IsDoubleBits::decode(bit_field_); | 36 return IsDoubleBits::decode(bit_field_); |
39 } | 37 } |
40 | 38 |
41 int offset() const { | 39 int offset() const { |
(...skipping 26 matching lines...) Expand all Loading... |
68 // The index itself is shifted up by one bit, the lower-most bit | 66 // The index itself is shifted up by one bit, the lower-most bit |
69 // signifying if the field is a mutable double box (1) or not (0). | 67 // signifying if the field is a mutable double box (1) or not (0). |
70 int result = index() - first_inobject_property_offset() / kPointerSize; | 68 int result = index() - first_inobject_property_offset() / kPointerSize; |
71 if (!is_inobject()) { | 69 if (!is_inobject()) { |
72 result = -result - 1; | 70 result = -result - 1; |
73 } | 71 } |
74 result <<= 1; | 72 result <<= 1; |
75 return is_double() ? (result | 1) : result; | 73 return is_double() ? (result | 1) : result; |
76 } | 74 } |
77 | 75 |
78 int GetKeyedLookupCacheIndex() const { | 76 int GetKeyedLookupCacheIndex() const; |
79 return property_index(); | |
80 } | |
81 | 77 |
82 int GetLoadFieldStubKey() const { | 78 int GetLoadFieldStubKey() const { |
83 return bit_field_ & | 79 return bit_field_ & |
84 (IsInObjectBits::kMask | IsDoubleBits::kMask | IndexBits::kMask); | 80 (IsInObjectBits::kMask | IsDoubleBits::kMask | IndexBits::kMask); |
85 } | 81 } |
86 | 82 |
87 private: | 83 private: |
88 FieldIndex(bool is_inobject, int local_index, bool is_double, | 84 FieldIndex(bool is_inobject, int local_index, bool is_double, |
89 int inobject_properties, int first_inobject_property_offset, | 85 int inobject_properties, int first_inobject_property_offset, |
90 bool is_hidden = false) { | 86 bool is_hidden = false) { |
(...skipping 23 matching lines...) Expand all Loading... |
114 class IsHiddenField: | 110 class IsHiddenField: |
115 public BitField<bool, FirstInobjectPropertyOffsetBits::kNext, 1> {}; | 111 public BitField<bool, FirstInobjectPropertyOffsetBits::kNext, 1> {}; |
116 STATIC_ASSERT(IsHiddenField::kNext <= 32); | 112 STATIC_ASSERT(IsHiddenField::kNext <= 32); |
117 | 113 |
118 int bit_field_; | 114 int bit_field_; |
119 }; | 115 }; |
120 | 116 |
121 } } // namespace v8::internal | 117 } } // namespace v8::internal |
122 | 118 |
123 #endif | 119 #endif |
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