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1 // Copyright 2006-2009 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2009 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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1075 // collection. Only valid during a scavenge collection (specifically, | 1075 // collection. Only valid during a scavenge collection (specifically, |
1076 // when all map words are heap object pointers, ie. not during a full GC). | 1076 // when all map words are heap object pointers, ie. not during a full GC). |
1077 inline bool IsForwardingAddress(); | 1077 inline bool IsForwardingAddress(); |
1078 | 1078 |
1079 // Create a map word from a forwarding address. | 1079 // Create a map word from a forwarding address. |
1080 static inline MapWord FromForwardingAddress(HeapObject* object); | 1080 static inline MapWord FromForwardingAddress(HeapObject* object); |
1081 | 1081 |
1082 // View this map word as a forwarding address. | 1082 // View this map word as a forwarding address. |
1083 inline HeapObject* ToForwardingAddress(); | 1083 inline HeapObject* ToForwardingAddress(); |
1084 | 1084 |
| 1085 // True if this map word is a serialization address. This will only be the |
| 1086 // case during a destructive serialization of the heap. |
| 1087 inline bool IsSerializationAddress(); |
| 1088 |
| 1089 // Create a map word from a serialization address. |
| 1090 static inline MapWord FromSerializationAddress(int raw); |
| 1091 |
| 1092 // View this map word as a serialization address. |
| 1093 inline int ToSerializationAddress(); |
1085 | 1094 |
1086 // Marking phase of full collection: the map word of live objects is | 1095 // Marking phase of full collection: the map word of live objects is |
1087 // marked, and may be marked as overflowed (eg, the object is live, its | 1096 // marked, and may be marked as overflowed (eg, the object is live, its |
1088 // children have not been visited, and it does not fit in the marking | 1097 // children have not been visited, and it does not fit in the marking |
1089 // stack). | 1098 // stack). |
1090 | 1099 |
1091 // True if this map word's mark bit is set. | 1100 // True if this map word's mark bit is set. |
1092 inline bool IsMarked(); | 1101 inline bool IsMarked(); |
1093 | 1102 |
1094 // Return this map word but with its mark bit set. | 1103 // Return this map word but with its mark bit set. |
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5098 virtual void VisitExternalReferences(Address* start, Address* end) {} | 5107 virtual void VisitExternalReferences(Address* start, Address* end) {} |
5099 | 5108 |
5100 inline void VisitExternalReference(Address* p) { | 5109 inline void VisitExternalReference(Address* p) { |
5101 VisitExternalReferences(p, p + 1); | 5110 VisitExternalReferences(p, p + 1); |
5102 } | 5111 } |
5103 | 5112 |
5104 #ifdef DEBUG | 5113 #ifdef DEBUG |
5105 // Intended for serialization/deserialization checking: insert, or | 5114 // Intended for serialization/deserialization checking: insert, or |
5106 // check for the presence of, a tag at this position in the stream. | 5115 // check for the presence of, a tag at this position in the stream. |
5107 virtual void Synchronize(const char* tag) {} | 5116 virtual void Synchronize(const char* tag) {} |
| 5117 #else |
| 5118 inline void Synchronize(const char* tag) {} |
5108 #endif | 5119 #endif |
5109 }; | 5120 }; |
5110 | 5121 |
5111 | 5122 |
5112 // BooleanBit is a helper class for setting and getting a bit in an | 5123 // BooleanBit is a helper class for setting and getting a bit in an |
5113 // integer or Smi. | 5124 // integer or Smi. |
5114 class BooleanBit : public AllStatic { | 5125 class BooleanBit : public AllStatic { |
5115 public: | 5126 public: |
5116 static inline bool get(Smi* smi, int bit_position) { | 5127 static inline bool get(Smi* smi, int bit_position) { |
5117 return get(smi->value(), bit_position); | 5128 return get(smi->value(), bit_position); |
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5131 } else { | 5142 } else { |
5132 value &= ~(1 << bit_position); | 5143 value &= ~(1 << bit_position); |
5133 } | 5144 } |
5134 return value; | 5145 return value; |
5135 } | 5146 } |
5136 }; | 5147 }; |
5137 | 5148 |
5138 } } // namespace v8::internal | 5149 } } // namespace v8::internal |
5139 | 5150 |
5140 #endif // V8_OBJECTS_H_ | 5151 #endif // V8_OBJECTS_H_ |
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