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| 1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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| 46 // Base class for all static visitors. | 46 // Base class for all static visitors. |
| 47 class StaticVisitorBase : public AllStatic { | 47 class StaticVisitorBase : public AllStatic { |
| 48 public: | 48 public: |
| 49 enum VisitorId { | 49 enum VisitorId { |
| 50 kVisitSeqAsciiString = 0, | 50 kVisitSeqAsciiString = 0, |
| 51 kVisitSeqTwoByteString, | 51 kVisitSeqTwoByteString, |
| 52 kVisitShortcutCandidate, | 52 kVisitShortcutCandidate, |
| 53 kVisitByteArray, | 53 kVisitByteArray, |
| 54 kVisitFreeSpace, | 54 kVisitFreeSpace, |
| 55 kVisitFixedArray, | 55 kVisitFixedArray, |
| 56 kVisitFixedDoubleArray, |
| 56 kVisitGlobalContext, | 57 kVisitGlobalContext, |
| 57 | 58 |
| 58 // For data objects, JS objects and structs along with generic visitor which | 59 // For data objects, JS objects and structs along with generic visitor which |
| 59 // can visit object of any size we provide visitors specialized by | 60 // can visit object of any size we provide visitors specialized by |
| 60 // object size in words. | 61 // object size in words. |
| 61 // Ids of specialized visitors are declared in a linear order (without | 62 // Ids of specialized visitors are declared in a linear order (without |
| 62 // holes) starting from the id of visitor specialized for 2 words objects | 63 // holes) starting from the id of visitor specialized for 2 words objects |
| 63 // (base visitor id) and ending with the id of generic visitor. | 64 // (base visitor id) and ending with the id of generic visitor. |
| 64 // Method GetVisitorIdForSize depends on this ordering to calculate visitor | 65 // Method GetVisitorIdForSize depends on this ordering to calculate visitor |
| 65 // id of specialized visitor from given instance size, base visitor id and | 66 // id of specialized visitor from given instance size, base visitor id and |
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| 98 kVisitStruct9, | 99 kVisitStruct9, |
| 99 kVisitStructGeneric, | 100 kVisitStructGeneric, |
| 100 | 101 |
| 101 kVisitConsString, | 102 kVisitConsString, |
| 102 kVisitOddball, | 103 kVisitOddball, |
| 103 kVisitCode, | 104 kVisitCode, |
| 104 kVisitMap, | 105 kVisitMap, |
| 105 kVisitPropertyCell, | 106 kVisitPropertyCell, |
| 106 kVisitSharedFunctionInfo, | 107 kVisitSharedFunctionInfo, |
| 107 kVisitJSFunction, | 108 kVisitJSFunction, |
| 109 kVisitJSRegExp, |
| 108 | 110 |
| 109 kVisitorIdCount, | 111 kVisitorIdCount, |
| 110 kMinObjectSizeInWords = 2 | 112 kMinObjectSizeInWords = 2 |
| 111 }; | 113 }; |
| 112 | 114 |
| 113 // Visitor ID should fit in one byte. | 115 // Visitor ID should fit in one byte. |
| 114 STATIC_ASSERT(kVisitorIdCount <= 256); | 116 STATIC_ASSERT(kVisitorIdCount <= 256); |
| 115 | 117 |
| 116 // Determine which specialized visitor should be used for given instance type | 118 // Determine which specialized visitor should be used for given instance type |
| 117 // and instance type. | 119 // and instance type. |
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| 278 | 280 |
| 279 static inline void VisitPointers(Heap* heap, Object** start, Object** end) { | 281 static inline void VisitPointers(Heap* heap, Object** start, Object** end) { |
| 280 for (Object** p = start; p < end; p++) StaticVisitor::VisitPointer(heap, p); | 282 for (Object** p = start; p < end; p++) StaticVisitor::VisitPointer(heap, p); |
| 281 } | 283 } |
| 282 | 284 |
| 283 private: | 285 private: |
| 284 static inline int VisitByteArray(Map* map, HeapObject* object) { | 286 static inline int VisitByteArray(Map* map, HeapObject* object) { |
| 285 return reinterpret_cast<ByteArray*>(object)->ByteArraySize(); | 287 return reinterpret_cast<ByteArray*>(object)->ByteArraySize(); |
| 286 } | 288 } |
| 287 | 289 |
| 290 static inline int VisitFixedDoubleArray(Map* map, HeapObject* object) { |
| 291 int length = reinterpret_cast<FixedDoubleArray*>(object)->length(); |
| 292 return FixedDoubleArray::SizeFor(length); |
| 293 } |
| 294 |
| 288 static inline int VisitSeqAsciiString(Map* map, HeapObject* object) { | 295 static inline int VisitSeqAsciiString(Map* map, HeapObject* object) { |
| 289 return SeqAsciiString::cast(object)-> | 296 return SeqAsciiString::cast(object)-> |
| 290 SeqAsciiStringSize(map->instance_type()); | 297 SeqAsciiStringSize(map->instance_type()); |
| 291 } | 298 } |
| 292 | 299 |
| 300 static inline int VisitJSRegExp(Map* map, HeapObject* object) { |
| 301 return JSObjectVisitor::Visit(map, object); |
| 302 } |
| 303 |
| 293 static inline int VisitSeqTwoByteString(Map* map, HeapObject* object) { | 304 static inline int VisitSeqTwoByteString(Map* map, HeapObject* object) { |
| 294 return SeqTwoByteString::cast(object)-> | 305 return SeqTwoByteString::cast(object)-> |
| 295 SeqTwoByteStringSize(map->instance_type()); | 306 SeqTwoByteStringSize(map->instance_type()); |
| 296 } | 307 } |
| 297 | 308 |
| 298 static inline int VisitFreeSpace(Map* map, HeapObject* object) { | 309 static inline int VisitFreeSpace(Map* map, HeapObject* object) { |
| 299 return FreeSpace::cast(object)->Size(); | 310 return FreeSpace::cast(object)->Size(); |
| 300 } | 311 } |
| 301 | 312 |
| 302 class DataObjectVisitor { | 313 class DataObjectVisitor { |
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| 326 | 337 |
| 327 | 338 |
| 328 template<typename StaticVisitor> | 339 template<typename StaticVisitor> |
| 329 VisitorDispatchTable<typename StaticNewSpaceVisitor<StaticVisitor>::Callback> | 340 VisitorDispatchTable<typename StaticNewSpaceVisitor<StaticVisitor>::Callback> |
| 330 StaticNewSpaceVisitor<StaticVisitor>::table_; | 341 StaticNewSpaceVisitor<StaticVisitor>::table_; |
| 331 | 342 |
| 332 | 343 |
| 333 } } // namespace v8::internal | 344 } } // namespace v8::internal |
| 334 | 345 |
| 335 #endif // V8_OBJECTS_VISITING_H_ | 346 #endif // V8_OBJECTS_VISITING_H_ |
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