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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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70 }; | 70 }; |
71 | 71 |
72 | 72 |
73 // PropertyDetails captures type and attributes for a property. | 73 // PropertyDetails captures type and attributes for a property. |
74 // They are used both in property dictionaries and instance descriptors. | 74 // They are used both in property dictionaries and instance descriptors. |
75 class PropertyDetails BASE_EMBEDDED { | 75 class PropertyDetails BASE_EMBEDDED { |
76 public: | 76 public: |
77 PropertyDetails(PropertyAttributes attributes, | 77 PropertyDetails(PropertyAttributes attributes, |
78 PropertyType type, | 78 PropertyType type, |
79 int index = 0) { | 79 int index = 0) { |
80 ASSERT(TypeField::is_valid(type)); | |
81 ASSERT(AttributesField::is_valid(attributes)); | |
82 ASSERT(StorageField::is_valid(index)); | |
83 | |
84 value_ = TypeField::encode(type) | 80 value_ = TypeField::encode(type) |
85 | AttributesField::encode(attributes) | 81 | AttributesField::encode(attributes) |
86 | StorageField::encode(index); | 82 | DictionaryStorageField::encode(index); |
87 | 83 |
88 ASSERT(type == this->type()); | 84 ASSERT(type == this->type()); |
89 ASSERT(attributes == this->attributes()); | 85 ASSERT(attributes == this->attributes()); |
90 ASSERT(index == this->index()); | 86 ASSERT(index == this->dictionary_index()); |
91 } | 87 } |
92 | 88 |
| 89 int pointer() { return DescriptorPointer::decode(value_); } |
| 90 |
| 91 PropertyDetails set_pointer(int i) { return PropertyDetails(value_, i); } |
| 92 |
93 // Conversion for storing details as Object*. | 93 // Conversion for storing details as Object*. |
94 explicit inline PropertyDetails(Smi* smi); | 94 explicit inline PropertyDetails(Smi* smi); |
95 inline Smi* AsSmi(); | 95 inline Smi* AsSmi(); |
96 | 96 |
97 PropertyType type() { return TypeField::decode(value_); } | 97 PropertyType type() { return TypeField::decode(value_); } |
98 | 98 |
99 PropertyAttributes attributes() { return AttributesField::decode(value_); } | 99 PropertyAttributes attributes() { return AttributesField::decode(value_); } |
100 | 100 |
101 int index() { return StorageField::decode(value_); } | 101 int dictionary_index() { |
| 102 return DictionaryStorageField::decode(value_); |
| 103 } |
| 104 |
| 105 int descriptor_index() { |
| 106 return DescriptorStorageField::decode(value_); |
| 107 } |
102 | 108 |
103 inline PropertyDetails AsDeleted(); | 109 inline PropertyDetails AsDeleted(); |
104 | 110 |
105 static bool IsValidIndex(int index) { | 111 static bool IsValidIndex(int index) { |
106 return StorageField::is_valid(index); | 112 return DictionaryStorageField::is_valid(index); |
107 } | 113 } |
108 | 114 |
109 bool IsReadOnly() { return (attributes() & READ_ONLY) != 0; } | 115 bool IsReadOnly() { return (attributes() & READ_ONLY) != 0; } |
110 bool IsDontDelete() { return (attributes() & DONT_DELETE) != 0; } | 116 bool IsDontDelete() { return (attributes() & DONT_DELETE) != 0; } |
111 bool IsDontEnum() { return (attributes() & DONT_ENUM) != 0; } | 117 bool IsDontEnum() { return (attributes() & DONT_ENUM) != 0; } |
112 bool IsDeleted() { return DeletedField::decode(value_) != 0;} | 118 bool IsDeleted() { return DeletedField::decode(value_) != 0;} |
113 | 119 |
114 // Bit fields in value_ (type, shift, size). Must be public so the | 120 // Bit fields in value_ (type, shift, size). Must be public so the |
115 // constants can be embedded in generated code. | 121 // constants can be embedded in generated code. |
116 class TypeField: public BitField<PropertyType, 0, 3> {}; | 122 class TypeField: public BitField<PropertyType, 0, 3> {}; |
117 class AttributesField: public BitField<PropertyAttributes, 3, 3> {}; | 123 class AttributesField: public BitField<PropertyAttributes, 3, 3> {}; |
118 class DeletedField: public BitField<uint32_t, 6, 1> {}; | 124 class DeletedField: public BitField<uint32_t, 6, 1> {}; |
119 class StorageField: public BitField<uint32_t, 7, 32-7> {}; | 125 class DictionaryStorageField: public BitField<uint32_t, 7, 24> {}; |
| 126 class DescriptorStorageField: public BitField<uint32_t, 7, 11> {}; |
| 127 class DescriptorPointer: public BitField<uint32_t, 18, 11> {}; |
120 | 128 |
121 static const int kInitialIndex = 1; | 129 static const int kInitialIndex = 1; |
122 | 130 |
123 private: | 131 private: |
| 132 PropertyDetails(int value, int pointer) { |
| 133 value_ = DescriptorPointer::update(value, pointer); |
| 134 } |
| 135 |
124 uint32_t value_; | 136 uint32_t value_; |
125 }; | 137 }; |
126 | 138 |
127 } } // namespace v8::internal | 139 } } // namespace v8::internal |
128 | 140 |
129 #endif // V8_PROPERTY_DETAILS_H_ | 141 #endif // V8_PROPERTY_DETAILS_H_ |
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