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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 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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1103 void HeapObject::IteratePointer(ObjectVisitor* v, int offset) { | 1103 void HeapObject::IteratePointer(ObjectVisitor* v, int offset) { |
1104 v->VisitPointer(reinterpret_cast<Object**>(FIELD_ADDR(this, offset))); | 1104 v->VisitPointer(reinterpret_cast<Object**>(FIELD_ADDR(this, offset))); |
1105 } | 1105 } |
1106 | 1106 |
1107 | 1107 |
1108 bool HeapObject::IsMarked() { | 1108 bool HeapObject::IsMarked() { |
1109 return map_word().IsMarked(); | 1109 return map_word().IsMarked(); |
1110 } | 1110 } |
1111 | 1111 |
1112 | 1112 |
1113 void HeapObject::SetMark() { | 1113 bool HeapObject::SetMark() { |
1114 ASSERT(!IsMarked()); | |
1115 MapWord first_word = map_word(); | 1114 MapWord first_word = map_word(); |
1116 first_word.SetMark(); | 1115 |
1117 set_map_word(first_word); | 1116 if (!first_word.IsMarked()) { |
| 1117 first_word.SetMark(); |
| 1118 set_map_word(first_word); |
| 1119 return true; |
| 1120 } |
| 1121 |
| 1122 return false; |
1118 } | 1123 } |
1119 | 1124 |
1120 | 1125 |
| 1126 bool HeapObject::SetMarkExclusively() { |
| 1127 MapWord first_word = map_word(); |
| 1128 |
| 1129 if (!first_word.IsMarked()) { |
| 1130 MapWord new_first_word = first_word; |
| 1131 new_first_word.SetMark(); |
| 1132 |
| 1133 AtomicWord* map_word_slot = |
| 1134 reinterpret_cast<AtomicWord*>(this->address() + kMapOffset); |
| 1135 |
| 1136 return AtomicCompareAndSwap(map_word_slot, |
| 1137 static_cast<AtomicWord>(first_word.value_), |
| 1138 static_cast<AtomicWord>(new_first_word.value_)); |
| 1139 } |
| 1140 |
| 1141 return false; |
| 1142 } |
| 1143 |
| 1144 |
1121 void HeapObject::ClearMark() { | 1145 void HeapObject::ClearMark() { |
1122 ASSERT(IsMarked()); | 1146 ASSERT(IsMarked()); |
1123 MapWord first_word = map_word(); | 1147 MapWord first_word = map_word(); |
1124 first_word.ClearMark(); | 1148 first_word.ClearMark(); |
1125 set_map_word(first_word); | 1149 set_map_word(first_word); |
1126 } | 1150 } |
1127 | 1151 |
1128 | 1152 |
1129 bool HeapObject::IsOverflowed() { | 1153 bool HeapObject::IsOverflowed() { |
1130 return map_word().IsOverflowed(); | 1154 return map_word().IsOverflowed(); |
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3550 #undef WRITE_INT_FIELD | 3574 #undef WRITE_INT_FIELD |
3551 #undef READ_SHORT_FIELD | 3575 #undef READ_SHORT_FIELD |
3552 #undef WRITE_SHORT_FIELD | 3576 #undef WRITE_SHORT_FIELD |
3553 #undef READ_BYTE_FIELD | 3577 #undef READ_BYTE_FIELD |
3554 #undef WRITE_BYTE_FIELD | 3578 #undef WRITE_BYTE_FIELD |
3555 | 3579 |
3556 | 3580 |
3557 } } // namespace v8::internal | 3581 } } // namespace v8::internal |
3558 | 3582 |
3559 #endif // V8_OBJECTS_INL_H_ | 3583 #endif // V8_OBJECTS_INL_H_ |
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