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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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1092 | 1092 |
1093 // Process the weak references. | 1093 // Process the weak references. |
1094 MarkCompactWeakObjectRetainer mark_compact_object_retainer; | 1094 MarkCompactWeakObjectRetainer mark_compact_object_retainer; |
1095 Heap::ProcessWeakReferences(&mark_compact_object_retainer); | 1095 Heap::ProcessWeakReferences(&mark_compact_object_retainer); |
1096 | 1096 |
1097 // Remove object groups after marking phase. | 1097 // Remove object groups after marking phase. |
1098 GlobalHandles::RemoveObjectGroups(); | 1098 GlobalHandles::RemoveObjectGroups(); |
1099 } | 1099 } |
1100 | 1100 |
1101 | 1101 |
1102 static int CountMarkedCallback(HeapObject* obj) { | |
1103 MapWord map_word = obj->map_word(); | |
1104 map_word.ClearMark(); | |
1105 return obj->SizeFromMap(map_word.ToMap()); | |
1106 } | |
1107 | |
1108 | |
1109 #ifdef DEBUG | 1102 #ifdef DEBUG |
1110 void MarkCompactCollector::UpdateLiveObjectCount(HeapObject* obj) { | 1103 void MarkCompactCollector::UpdateLiveObjectCount(HeapObject* obj) { |
1111 live_bytes_ += obj->Size(); | 1104 live_bytes_ += obj->Size(); |
1112 if (Heap::new_space()->Contains(obj)) { | 1105 if (Heap::new_space()->Contains(obj)) { |
1113 live_young_objects_size_ += obj->Size(); | 1106 live_young_objects_size_ += obj->Size(); |
1114 } else if (Heap::map_space()->Contains(obj)) { | 1107 } else if (Heap::map_space()->Contains(obj)) { |
1115 ASSERT(obj->IsMap()); | 1108 ASSERT(obj->IsMap()); |
1116 live_map_objects_size_ += obj->Size(); | 1109 live_map_objects_size_ += obj->Size(); |
1117 } else if (Heap::cell_space()->Contains(obj)) { | 1110 } else if (Heap::cell_space()->Contains(obj)) { |
1118 ASSERT(obj->IsJSGlobalPropertyCell()); | 1111 ASSERT(obj->IsJSGlobalPropertyCell()); |
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1145 | 1138 |
1146 // Safe to use during marking phase only. | 1139 // Safe to use during marking phase only. |
1147 bool MarkCompactCollector::SafeIsMap(HeapObject* object) { | 1140 bool MarkCompactCollector::SafeIsMap(HeapObject* object) { |
1148 MapWord metamap = object->map_word(); | 1141 MapWord metamap = object->map_word(); |
1149 metamap.ClearMark(); | 1142 metamap.ClearMark(); |
1150 return metamap.ToMap()->instance_type() == MAP_TYPE; | 1143 return metamap.ToMap()->instance_type() == MAP_TYPE; |
1151 } | 1144 } |
1152 | 1145 |
1153 | 1146 |
1154 void MarkCompactCollector::ClearNonLiveTransitions() { | 1147 void MarkCompactCollector::ClearNonLiveTransitions() { |
1155 HeapObjectIterator map_iterator(Heap::map_space(), &CountMarkedCallback); | 1148 HeapObjectIterator map_iterator(Heap::map_space(), &SizeOfMarkedObject); |
1156 // Iterate over the map space, setting map transitions that go from | 1149 // Iterate over the map space, setting map transitions that go from |
1157 // a marked map to an unmarked map to null transitions. At the same time, | 1150 // a marked map to an unmarked map to null transitions. At the same time, |
1158 // set all the prototype fields of maps back to their original value, | 1151 // set all the prototype fields of maps back to their original value, |
1159 // dropping the back pointers temporarily stored in the prototype field. | 1152 // dropping the back pointers temporarily stored in the prototype field. |
1160 // Setting the prototype field requires following the linked list of | 1153 // Setting the prototype field requires following the linked list of |
1161 // back pointers, reversing them all at once. This allows us to find | 1154 // back pointers, reversing them all at once. This allows us to find |
1162 // those maps with map transitions that need to be nulled, and only | 1155 // those maps with map transitions that need to be nulled, and only |
1163 // scan the descriptor arrays of those maps, not all maps. | 1156 // scan the descriptor arrays of those maps, not all maps. |
1164 // All of these actions are carried out only on maps of JSObjects | 1157 // All of these actions are carried out only on maps of JSObjects |
1165 // and related subtypes. | 1158 // and related subtypes. |
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2666 #ifdef ENABLE_LOGGING_AND_PROFILING | 2659 #ifdef ENABLE_LOGGING_AND_PROFILING |
2667 if (obj->IsCode()) { | 2660 if (obj->IsCode()) { |
2668 PROFILE(CodeDeleteEvent(obj->address())); | 2661 PROFILE(CodeDeleteEvent(obj->address())); |
2669 } else if (obj->IsJSFunction()) { | 2662 } else if (obj->IsJSFunction()) { |
2670 PROFILE(FunctionDeleteEvent(obj->address())); | 2663 PROFILE(FunctionDeleteEvent(obj->address())); |
2671 } | 2664 } |
2672 #endif | 2665 #endif |
2673 } | 2666 } |
2674 | 2667 |
2675 | 2668 |
| 2669 int MarkCompactCollector::SizeOfMarkedObject(HeapObject* obj) { |
| 2670 MapWord map_word = obj->map_word(); |
| 2671 map_word.ClearMark(); |
| 2672 return obj->SizeFromMap(map_word.ToMap()); |
| 2673 } |
| 2674 |
| 2675 |
2676 void MarkCompactCollector::Initialize() { | 2676 void MarkCompactCollector::Initialize() { |
2677 StaticPointersToNewGenUpdatingVisitor::Initialize(); | 2677 StaticPointersToNewGenUpdatingVisitor::Initialize(); |
2678 StaticMarkingVisitor::Initialize(); | 2678 StaticMarkingVisitor::Initialize(); |
2679 } | 2679 } |
2680 | 2680 |
2681 | 2681 |
2682 } } // namespace v8::internal | 2682 } } // namespace v8::internal |
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