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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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142 int8_t kind_; | 142 int8_t kind_; |
143 }; | 143 }; |
144 | 144 |
145 | 145 |
146 // PropertyDetails captures type and attributes for a property. | 146 // PropertyDetails captures type and attributes for a property. |
147 // They are used both in property dictionaries and instance descriptors. | 147 // They are used both in property dictionaries and instance descriptors. |
148 class PropertyDetails BASE_EMBEDDED { | 148 class PropertyDetails BASE_EMBEDDED { |
149 public: | 149 public: |
150 PropertyDetails(PropertyAttributes attributes, | 150 PropertyDetails(PropertyAttributes attributes, |
151 PropertyType type, | 151 PropertyType type, |
152 Representation representation, | 152 int index) { |
153 int index = 0) { | |
154 value_ = TypeField::encode(type) | 153 value_ = TypeField::encode(type) |
155 | AttributesField::encode(attributes) | 154 | AttributesField::encode(attributes) |
156 | RepresentationField::encode(EncodeRepresentation(representation)) | |
157 | DictionaryStorageField::encode(index); | 155 | DictionaryStorageField::encode(index); |
158 | 156 |
159 ASSERT(type == this->type()); | 157 ASSERT(type == this->type()); |
160 ASSERT(attributes == this->attributes()); | 158 ASSERT(attributes == this->attributes()); |
161 if (representation.IsNone()) { | 159 } |
162 ASSERT(index == this->dictionary_index()); | 160 |
163 } else { | 161 PropertyDetails(PropertyAttributes attributes, |
164 ASSERT(index == this->descriptor_index()); | 162 PropertyType type, |
165 } | 163 Representation representation) { |
| 164 value_ = TypeField::encode(type) |
| 165 | AttributesField::encode(attributes) |
| 166 | RepresentationField::encode(EncodeRepresentation(representation)); |
166 } | 167 } |
167 | 168 |
168 int pointer() { return DescriptorPointer::decode(value_); } | 169 int pointer() { return DescriptorPointer::decode(value_); } |
169 | 170 |
170 PropertyDetails set_pointer(int i) { return PropertyDetails(value_, i); } | 171 PropertyDetails set_pointer(int i) { return PropertyDetails(value_, i); } |
171 | 172 |
172 PropertyDetails CopyWithRepresentation(Representation representation) { | 173 PropertyDetails CopyWithRepresentation(Representation representation) { |
173 return PropertyDetails(value_, representation); | 174 return PropertyDetails(value_, representation); |
174 } | 175 } |
175 | 176 |
176 // Conversion for storing details as Object*. | 177 // Conversion for storing details as Object*. |
177 explicit inline PropertyDetails(Smi* smi); | 178 explicit inline PropertyDetails(Smi* smi); |
178 inline Smi* AsSmi(); | 179 inline Smi* AsSmi(); |
179 | 180 |
180 static uint8_t EncodeRepresentation(Representation representation) { | 181 static uint8_t EncodeRepresentation(Representation representation) { |
181 ASSERT(representation.kind() <= Representation::kTagged); | 182 return representation.kind(); |
182 if (representation.kind() < Representation::kInteger32) { | |
183 return representation.kind(); | |
184 } else { | |
185 return representation.kind() - 1; | |
186 } | |
187 } | 183 } |
188 | 184 |
189 static Representation DecodeRepresentation(uint32_t bits) { | 185 static Representation DecodeRepresentation(uint32_t bits) { |
190 ASSERT(bits <= Representation::kTagged); | |
191 if (bits >= Representation::kInteger32) bits += 1; | |
192 return Representation::FromKind(static_cast<Representation::Kind>(bits)); | 186 return Representation::FromKind(static_cast<Representation::Kind>(bits)); |
193 } | 187 } |
194 | 188 |
195 PropertyType type() { return TypeField::decode(value_); } | 189 PropertyType type() { return TypeField::decode(value_); } |
196 | 190 |
197 PropertyAttributes attributes() const { | 191 PropertyAttributes attributes() const { |
198 return AttributesField::decode(value_); | 192 return AttributesField::decode(value_); |
199 } | 193 } |
200 | 194 |
201 int dictionary_index() { | 195 int dictionary_index() { |
202 return DictionaryStorageField::decode(value_); | 196 return DictionaryStorageField::decode(value_); |
203 } | 197 } |
204 | 198 |
205 int descriptor_index() { | |
206 return DescriptorStorageField::decode(value_); | |
207 } | |
208 | |
209 Representation representation() { | 199 Representation representation() { |
210 return DecodeRepresentation(RepresentationField::decode(value_)); | 200 return DecodeRepresentation(RepresentationField::decode(value_)); |
211 } | 201 } |
212 | 202 |
213 inline PropertyDetails AsDeleted(); | 203 inline PropertyDetails AsDeleted(); |
214 | 204 |
215 static bool IsValidIndex(int index) { | 205 static bool IsValidIndex(int index) { |
216 return DictionaryStorageField::is_valid(index); | 206 return DictionaryStorageField::is_valid(index); |
217 } | 207 } |
218 | 208 |
219 bool IsReadOnly() const { return (attributes() & READ_ONLY) != 0; } | 209 bool IsReadOnly() const { return (attributes() & READ_ONLY) != 0; } |
220 bool IsDontDelete() const { return (attributes() & DONT_DELETE) != 0; } | 210 bool IsDontDelete() const { return (attributes() & DONT_DELETE) != 0; } |
221 bool IsDontEnum() const { return (attributes() & DONT_ENUM) != 0; } | 211 bool IsDontEnum() const { return (attributes() & DONT_ENUM) != 0; } |
222 bool IsDeleted() const { return DeletedField::decode(value_) != 0;} | 212 bool IsDeleted() const { return DeletedField::decode(value_) != 0;} |
223 | 213 |
224 // Bit fields in value_ (type, shift, size). Must be public so the | 214 // Bit fields in value_ (type, shift, size). Must be public so the |
225 // constants can be embedded in generated code. | 215 // constants can be embedded in generated code. |
226 class TypeField: public BitField<PropertyType, 0, 3> {}; | 216 class TypeField: public BitField<PropertyType, 0, 3> {}; |
227 class AttributesField: public BitField<PropertyAttributes, 3, 3> {}; | 217 class AttributesField: public BitField<PropertyAttributes, 3, 3> {}; |
228 class DeletedField: public BitField<uint32_t, 6, 1> {}; | 218 class DeletedField: public BitField<uint32_t, 6, 1> {}; |
229 class DictionaryStorageField: public BitField<uint32_t, 7, 24> {}; | 219 class DictionaryStorageField: public BitField<uint32_t, 7, 24> {}; |
230 class DescriptorStorageField: public BitField<uint32_t, 7, 11> {}; | 220 class DescriptorPointer: public BitField<uint32_t, 7, 11> {}; |
231 class DescriptorPointer: public BitField<uint32_t, 18, 11> {}; | 221 class RepresentationField: public BitField<uint32_t, 18, 3> {}; |
232 class RepresentationField: public BitField<uint32_t, 29, 2> {}; | |
233 | 222 |
234 static const int kInitialIndex = 1; | 223 static const int kInitialIndex = 1; |
235 | 224 |
236 private: | 225 private: |
237 PropertyDetails(int value, int pointer) { | 226 PropertyDetails(int value, int pointer) { |
238 value_ = DescriptorPointer::update(value, pointer); | 227 value_ = DescriptorPointer::update(value, pointer); |
239 } | 228 } |
240 PropertyDetails(int value, Representation representation) { | 229 PropertyDetails(int value, Representation representation) { |
241 value_ = RepresentationField::update( | 230 value_ = RepresentationField::update( |
242 value, EncodeRepresentation(representation)); | 231 value, EncodeRepresentation(representation)); |
243 } | 232 } |
244 | 233 |
245 uint32_t value_; | 234 uint32_t value_; |
246 }; | 235 }; |
247 | 236 |
248 } } // namespace v8::internal | 237 } } // namespace v8::internal |
249 | 238 |
250 #endif // V8_PROPERTY_DETAILS_H_ | 239 #endif // V8_PROPERTY_DETAILS_H_ |
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