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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 // 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_PROPERTY_DETAILS_H_ | 5 #ifndef V8_PROPERTY_DETAILS_H_ |
6 #define V8_PROPERTY_DETAILS_H_ | 6 #define V8_PROPERTY_DETAILS_H_ |
7 | 7 |
8 #include "include/v8.h" | 8 #include "include/v8.h" |
9 #include "src/allocation.h" | 9 #include "src/allocation.h" |
10 #include "src/utils.h" | 10 #include "src/utils.h" |
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34 namespace v8 { | 34 namespace v8 { |
35 namespace internal { | 35 namespace internal { |
36 | 36 |
37 class Smi; | 37 class Smi; |
38 template<class> class TypeImpl; | 38 template<class> class TypeImpl; |
39 struct ZoneTypeConfig; | 39 struct ZoneTypeConfig; |
40 typedef TypeImpl<ZoneTypeConfig> Type; | 40 typedef TypeImpl<ZoneTypeConfig> Type; |
41 class TypeInfo; | 41 class TypeInfo; |
42 | 42 |
43 // Type of properties. | 43 // Type of properties. |
| 44 // Order of kinds is significant. |
| 45 // Must fit in the BitField PropertyDetails::KindField. |
| 46 enum PropertyKind { DATA = 0, ACCESSOR = 1 }; |
| 47 |
| 48 |
| 49 // Order of modes is significant. |
| 50 // Must fit in the BitField PropertyDetails::StoreModeField. |
| 51 enum PropertyLocation { IN_OBJECT = 0, IN_DESCRIPTOR = 1 }; |
| 52 |
| 53 |
44 // Order of properties is significant. | 54 // Order of properties is significant. |
45 // Must fit in the BitField PropertyDetails::TypeField. | 55 // Must fit in the BitField PropertyDetails::TypeField. |
46 // A copy of this is in mirror-debugger.js. | 56 // A copy of this is in mirror-debugger.js. |
47 enum PropertyType { FIELD = 0, CONSTANT = 1, CALLBACKS = 2 }; | 57 enum PropertyType { |
| 58 FIELD = (IN_OBJECT << 1) | DATA, |
| 59 CONSTANT = (IN_DESCRIPTOR << 1) | DATA, |
| 60 CALLBACKS = (IN_DESCRIPTOR << 1) | ACCESSOR |
| 61 }; |
48 | 62 |
49 | 63 |
50 class Representation { | 64 class Representation { |
51 public: | 65 public: |
52 enum Kind { | 66 enum Kind { |
53 kNone, | 67 kNone, |
54 kInteger8, | 68 kInteger8, |
55 kUInteger8, | 69 kUInteger8, |
56 kInteger16, | 70 kInteger16, |
57 kUInteger16, | 71 kUInteger16, |
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215 inline Smi* AsSmi() const; | 229 inline Smi* AsSmi() const; |
216 | 230 |
217 static uint8_t EncodeRepresentation(Representation representation) { | 231 static uint8_t EncodeRepresentation(Representation representation) { |
218 return representation.kind(); | 232 return representation.kind(); |
219 } | 233 } |
220 | 234 |
221 static Representation DecodeRepresentation(uint32_t bits) { | 235 static Representation DecodeRepresentation(uint32_t bits) { |
222 return Representation::FromKind(static_cast<Representation::Kind>(bits)); | 236 return Representation::FromKind(static_cast<Representation::Kind>(bits)); |
223 } | 237 } |
224 | 238 |
| 239 PropertyKind kind() const { return KindField::decode(value_); } |
| 240 PropertyLocation location() const { return LocationField::decode(value_); } |
| 241 |
225 PropertyType type() const { return TypeField::decode(value_); } | 242 PropertyType type() const { return TypeField::decode(value_); } |
226 | 243 |
227 PropertyAttributes attributes() const { | 244 PropertyAttributes attributes() const { |
228 return AttributesField::decode(value_); | 245 return AttributesField::decode(value_); |
229 } | 246 } |
230 | 247 |
231 int dictionary_index() const { | 248 int dictionary_index() const { |
232 return DictionaryStorageField::decode(value_); | 249 return DictionaryStorageField::decode(value_); |
233 } | 250 } |
234 | 251 |
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246 return DictionaryStorageField::is_valid(index); | 263 return DictionaryStorageField::is_valid(index); |
247 } | 264 } |
248 | 265 |
249 bool IsReadOnly() const { return (attributes() & READ_ONLY) != 0; } | 266 bool IsReadOnly() const { return (attributes() & READ_ONLY) != 0; } |
250 bool IsConfigurable() const { return (attributes() & DONT_DELETE) == 0; } | 267 bool IsConfigurable() const { return (attributes() & DONT_DELETE) == 0; } |
251 bool IsDontEnum() const { return (attributes() & DONT_ENUM) != 0; } | 268 bool IsDontEnum() const { return (attributes() & DONT_ENUM) != 0; } |
252 bool IsDeleted() const { return DeletedField::decode(value_) != 0; } | 269 bool IsDeleted() const { return DeletedField::decode(value_) != 0; } |
253 | 270 |
254 // Bit fields in value_ (type, shift, size). Must be public so the | 271 // Bit fields in value_ (type, shift, size). Must be public so the |
255 // constants can be embedded in generated code. | 272 // constants can be embedded in generated code. |
256 class TypeField : public BitField<PropertyType, 0, 2> {}; | 273 class KindField : public BitField<PropertyKind, 0, 1> {}; |
| 274 class LocationField : public BitField<PropertyLocation, 1, 1> {}; |
257 class AttributesField : public BitField<PropertyAttributes, 2, 3> {}; | 275 class AttributesField : public BitField<PropertyAttributes, 2, 3> {}; |
258 | 276 |
259 // Bit fields for normalized objects. | 277 // Bit fields for normalized objects. |
260 class DeletedField : public BitField<uint32_t, 5, 1> {}; | 278 class DeletedField : public BitField<uint32_t, 5, 1> {}; |
261 class DictionaryStorageField : public BitField<uint32_t, 6, 24> {}; | 279 class DictionaryStorageField : public BitField<uint32_t, 6, 24> {}; |
262 | 280 |
263 // Bit fields for fast objects. | 281 // Bit fields for fast objects. |
264 class RepresentationField : public BitField<uint32_t, 5, 4> {}; | 282 class RepresentationField : public BitField<uint32_t, 5, 4> {}; |
265 class DescriptorPointer | 283 class DescriptorPointer |
266 : public BitField<uint32_t, 9, kDescriptorIndexBitCount> {}; // NOLINT | 284 : public BitField<uint32_t, 9, kDescriptorIndexBitCount> {}; // NOLINT |
267 class FieldIndexField | 285 class FieldIndexField |
268 : public BitField<uint32_t, 9 + kDescriptorIndexBitCount, | 286 : public BitField<uint32_t, 9 + kDescriptorIndexBitCount, |
269 kDescriptorIndexBitCount> {}; // NOLINT | 287 kDescriptorIndexBitCount> {}; // NOLINT |
270 | 288 |
| 289 // NOTE: TypeField overlaps with KindField and LocationField. |
| 290 class TypeField : public BitField<PropertyType, 0, 2> {}; |
| 291 STATIC_ASSERT(KindField::kNext == LocationField::kShift); |
| 292 STATIC_ASSERT(TypeField::kShift == KindField::kShift); |
| 293 STATIC_ASSERT(TypeField::kNext == LocationField::kNext); |
| 294 |
271 // All bits for both fast and slow objects must fit in a smi. | 295 // All bits for both fast and slow objects must fit in a smi. |
272 STATIC_ASSERT(DictionaryStorageField::kNext <= 31); | 296 STATIC_ASSERT(DictionaryStorageField::kNext <= 31); |
273 STATIC_ASSERT(FieldIndexField::kNext <= 31); | 297 STATIC_ASSERT(FieldIndexField::kNext <= 31); |
274 | 298 |
275 static const int kInitialIndex = 1; | 299 static const int kInitialIndex = 1; |
276 | 300 |
277 #ifdef OBJECT_PRINT | 301 #ifdef OBJECT_PRINT |
278 // For our gdb macros, we should perhaps change these in the future. | 302 // For our gdb macros, we should perhaps change these in the future. |
279 void Print(bool dictionary_mode); | 303 void Print(bool dictionary_mode); |
280 #endif | 304 #endif |
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294 uint32_t value_; | 318 uint32_t value_; |
295 }; | 319 }; |
296 | 320 |
297 | 321 |
298 std::ostream& operator<<(std::ostream& os, | 322 std::ostream& operator<<(std::ostream& os, |
299 const PropertyAttributes& attributes); | 323 const PropertyAttributes& attributes); |
300 std::ostream& operator<<(std::ostream& os, const PropertyDetails& details); | 324 std::ostream& operator<<(std::ostream& os, const PropertyDetails& details); |
301 } } // namespace v8::internal | 325 } } // namespace v8::internal |
302 | 326 |
303 #endif // V8_PROPERTY_DETAILS_H_ | 327 #endif // V8_PROPERTY_DETAILS_H_ |
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