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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/property-details.h" | 8 #include "src/property-details.h" |
9 #include "src/utils.h" | 9 #include "src/utils.h" |
10 | 10 |
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27 static FieldIndex ForLoadByFieldIndex(Map* map, int index); | 27 static FieldIndex ForLoadByFieldIndex(Map* map, int index); |
28 static FieldIndex ForKeyedLookupCacheIndex(Map* map, int index); | 28 static FieldIndex ForKeyedLookupCacheIndex(Map* map, int index); |
29 static FieldIndex FromFieldAccessStubKey(int key); | 29 static FieldIndex FromFieldAccessStubKey(int key); |
30 | 30 |
31 int GetLoadByFieldIndex() const; | 31 int GetLoadByFieldIndex() const; |
32 | 32 |
33 bool is_inobject() const { | 33 bool is_inobject() const { |
34 return IsInObjectBits::decode(bit_field_); | 34 return IsInObjectBits::decode(bit_field_); |
35 } | 35 } |
36 | 36 |
| 37 bool is_hidden_field() const { return IsHiddenField::decode(bit_field_); } |
| 38 |
37 bool is_double() const { | 39 bool is_double() const { |
38 return IsDoubleBits::decode(bit_field_); | 40 return IsDoubleBits::decode(bit_field_); |
39 } | 41 } |
40 | 42 |
41 int offset() const { | 43 int offset() const { |
42 return index() * kPointerSize; | 44 return index() * kPointerSize; |
43 } | 45 } |
44 | 46 |
45 // Zero-indexed from beginning of the object. | 47 // Zero-indexed from beginning of the object. |
46 int index() const { | 48 int index() const { |
47 return IndexBits::decode(bit_field_); | 49 return IndexBits::decode(bit_field_); |
48 } | 50 } |
49 | 51 |
50 int outobject_array_index() const { | 52 int outobject_array_index() const { |
51 DCHECK(!is_inobject()); | 53 DCHECK(!is_inobject()); |
52 return index() - first_inobject_property_offset() / kPointerSize; | 54 return index() - first_inobject_property_offset() / kPointerSize; |
53 } | 55 } |
54 | 56 |
55 // Zero-based from the first inobject property. Overflows to out-of-object | 57 // Zero-based from the first inobject property. Overflows to out-of-object |
56 // properties. | 58 // properties. |
57 int property_index() const { | 59 int property_index() const { |
58 DCHECK(!IsHiddenField::decode(bit_field_)); | 60 DCHECK(!is_hidden_field()); |
59 int result = index() - first_inobject_property_offset() / kPointerSize; | 61 int result = index() - first_inobject_property_offset() / kPointerSize; |
60 if (!is_inobject()) { | 62 if (!is_inobject()) { |
61 result += InObjectPropertyBits::decode(bit_field_); | 63 result += InObjectPropertyBits::decode(bit_field_); |
62 } | 64 } |
63 return result; | 65 return result; |
64 } | 66 } |
65 | 67 |
66 int GetKeyedLookupCacheIndex() const; | 68 int GetKeyedLookupCacheIndex() const; |
67 | 69 |
68 int GetFieldAccessStubKey() const { | 70 int GetFieldAccessStubKey() const { |
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79 IsDoubleBits::encode(is_double) | | 81 IsDoubleBits::encode(is_double) | |
80 FirstInobjectPropertyOffsetBits::encode(first_inobject_property_offset) | | 82 FirstInobjectPropertyOffsetBits::encode(first_inobject_property_offset) | |
81 IsHiddenField::encode(is_hidden) | | 83 IsHiddenField::encode(is_hidden) | |
82 IndexBits::encode(local_index) | | 84 IndexBits::encode(local_index) | |
83 InObjectPropertyBits::encode(inobject_properties); | 85 InObjectPropertyBits::encode(inobject_properties); |
84 } | 86 } |
85 | 87 |
86 explicit FieldIndex(int bit_field) : bit_field_(bit_field) {} | 88 explicit FieldIndex(int bit_field) : bit_field_(bit_field) {} |
87 | 89 |
88 int first_inobject_property_offset() const { | 90 int first_inobject_property_offset() const { |
89 DCHECK(!IsHiddenField::decode(bit_field_)); | 91 DCHECK(!is_hidden_field()); |
90 return FirstInobjectPropertyOffsetBits::decode(bit_field_); | 92 return FirstInobjectPropertyOffsetBits::decode(bit_field_); |
91 } | 93 } |
92 | 94 |
93 static const int kIndexBitsSize = kDescriptorIndexBitCount + 1; | 95 static const int kIndexBitsSize = kDescriptorIndexBitCount + 1; |
94 | 96 |
95 // Index from beginning of object. | 97 // Index from beginning of object. |
96 class IndexBits: public BitField<int, 0, kIndexBitsSize> {}; | 98 class IndexBits: public BitField<int, 0, kIndexBitsSize> {}; |
97 class IsInObjectBits: public BitField<bool, IndexBits::kNext, 1> {}; | 99 class IsInObjectBits: public BitField<bool, IndexBits::kNext, 1> {}; |
98 class IsDoubleBits: public BitField<bool, IsInObjectBits::kNext, 1> {}; | 100 class IsDoubleBits: public BitField<bool, IsInObjectBits::kNext, 1> {}; |
99 // Number of inobject properties. | 101 // Number of inobject properties. |
100 class InObjectPropertyBits | 102 class InObjectPropertyBits |
101 : public BitField<int, IsDoubleBits::kNext, kDescriptorIndexBitCount> {}; | 103 : public BitField<int, IsDoubleBits::kNext, kDescriptorIndexBitCount> {}; |
102 // Offset of first inobject property from beginning of object. | 104 // Offset of first inobject property from beginning of object. |
103 class FirstInobjectPropertyOffsetBits | 105 class FirstInobjectPropertyOffsetBits |
104 : public BitField<int, InObjectPropertyBits::kNext, 7> {}; | 106 : public BitField<int, InObjectPropertyBits::kNext, 7> {}; |
105 class IsHiddenField | 107 class IsHiddenField |
106 : public BitField<bool, FirstInobjectPropertyOffsetBits::kNext, 1> {}; | 108 : public BitField<bool, FirstInobjectPropertyOffsetBits::kNext, 1> {}; |
107 STATIC_ASSERT(IsHiddenField::kNext <= 32); | 109 STATIC_ASSERT(IsHiddenField::kNext <= 32); |
108 | 110 |
109 int bit_field_; | 111 int bit_field_; |
110 }; | 112 }; |
111 | 113 |
112 } } // namespace v8::internal | 114 } } // namespace v8::internal |
113 | 115 |
114 #endif | 116 #endif |
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