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Issue 3089005: [Isolates] Add a pointer to Heap to a meta map. (Closed)
Patch Set: review feedback Created 10 years, 4 months ago
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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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396 int pointers_removed_; 396 int pointers_removed_;
397 }; 397 };
398 398
399 399
400 void MarkCompactCollector::MarkUnmarkedObject(HeapObject* object) { 400 void MarkCompactCollector::MarkUnmarkedObject(HeapObject* object) {
401 ASSERT(!object->IsMarked()); 401 ASSERT(!object->IsMarked());
402 ASSERT(HEAP->Contains(object)); 402 ASSERT(HEAP->Contains(object));
403 if (object->IsMap()) { 403 if (object->IsMap()) {
404 Map* map = Map::cast(object); 404 Map* map = Map::cast(object);
405 if (FLAG_cleanup_caches_in_maps_at_gc) { 405 if (FLAG_cleanup_caches_in_maps_at_gc) {
406 map->ClearCodeCache(); 406 map->ClearCodeCache(heap_);
407 } 407 }
408 SetMark(map); 408 SetMark(map);
409 if (FLAG_collect_maps && 409 if (FLAG_collect_maps &&
410 map->instance_type() >= FIRST_JS_OBJECT_TYPE && 410 map->instance_type() >= FIRST_JS_OBJECT_TYPE &&
411 map->instance_type() <= JS_FUNCTION_TYPE) { 411 map->instance_type() <= JS_FUNCTION_TYPE) {
412 MarkMapContents(map); 412 MarkMapContents(map);
413 } else { 413 } else {
414 marking_stack_.Push(map); 414 marking_stack_.Push(map);
415 } 415 }
416 } else { 416 } else {
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822 Object* next; 822 Object* next;
823 while (SafeIsMap(current)) { 823 while (SafeIsMap(current)) {
824 next = current->prototype(); 824 next = current->prototype();
825 // There should never be a dead map above a live map. 825 // There should never be a dead map above a live map.
826 ASSERT(on_dead_path || current->IsMarked()); 826 ASSERT(on_dead_path || current->IsMarked());
827 827
828 // A live map above a dead map indicates a dead transition. 828 // A live map above a dead map indicates a dead transition.
829 // This test will always be false on the first iteration. 829 // This test will always be false on the first iteration.
830 if (on_dead_path && current->IsMarked()) { 830 if (on_dead_path && current->IsMarked()) {
831 on_dead_path = false; 831 on_dead_path = false;
832 current->ClearNonLiveTransitions(real_prototype); 832 current->ClearNonLiveTransitions(heap_, real_prototype);
833 } 833 }
834 *HeapObject::RawField(current, Map::kPrototypeOffset) = 834 *HeapObject::RawField(current, Map::kPrototypeOffset) =
835 real_prototype; 835 real_prototype;
836 current = reinterpret_cast<Map*>(next); 836 current = reinterpret_cast<Map*>(next);
837 } 837 }
838 } 838 }
839 } 839 }
840 840
841 // ------------------------------------------------------------------------- 841 // -------------------------------------------------------------------------
842 // Phase 2: Encode forwarding addresses. 842 // Phase 2: Encode forwarding addresses.
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2348 #ifdef ENABLE_LOGGING_AND_PROFILING 2348 #ifdef ENABLE_LOGGING_AND_PROFILING
2349 if (obj->IsCode()) { 2349 if (obj->IsCode()) {
2350 PROFILE(CodeDeleteEvent(obj->address())); 2350 PROFILE(CodeDeleteEvent(obj->address()));
2351 } else if (obj->IsJSFunction()) { 2351 } else if (obj->IsJSFunction()) {
2352 PROFILE(FunctionDeleteEvent(obj->address())); 2352 PROFILE(FunctionDeleteEvent(obj->address()));
2353 } 2353 }
2354 #endif 2354 #endif
2355 } 2355 }
2356 2356
2357 } } // namespace v8::internal 2357 } } // namespace v8::internal
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