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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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1683 | 1683 |
1684 MapWord encoding = | 1684 MapWord encoding = |
1685 MapWord::EncodeAddress(old_object->map()->address(), *offset); | 1685 MapWord::EncodeAddress(old_object->map()->address(), *offset); |
1686 old_object->set_map_word(encoding); | 1686 old_object->set_map_word(encoding); |
1687 *offset += object_size; | 1687 *offset += object_size; |
1688 ASSERT(*offset <= Page::kObjectAreaSize); | 1688 ASSERT(*offset <= Page::kObjectAreaSize); |
1689 } | 1689 } |
1690 | 1690 |
1691 | 1691 |
1692 // Most non-live objects are ignored. | 1692 // Most non-live objects are ignored. |
1693 inline void IgnoreNonLiveObject(HeapObject* object) {} | 1693 inline void IgnoreNonLiveObject(HeapObject* object, Isolate* isolate) {} |
1694 | 1694 |
1695 | 1695 |
1696 // Function template that, given a range of addresses (eg, a semispace or a | 1696 // Function template that, given a range of addresses (eg, a semispace or a |
1697 // paged space page), iterates through the objects in the range to clear | 1697 // paged space page), iterates through the objects in the range to clear |
1698 // mark bits and compute and encode forwarding addresses. As a side effect, | 1698 // mark bits and compute and encode forwarding addresses. As a side effect, |
1699 // maximal free chunks are marked so that they can be skipped on subsequent | 1699 // maximal free chunks are marked so that they can be skipped on subsequent |
1700 // sweeps. | 1700 // sweeps. |
1701 // | 1701 // |
1702 // The template parameters are an allocation function, a forwarding address | 1702 // The template parameters are an allocation function, a forwarding address |
1703 // encoding function, and a function to process non-live objects. | 1703 // encoding function, and a function to process non-live objects. |
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1737 PrintF("forward %p -> %p.\n", object->address(), | 1737 PrintF("forward %p -> %p.\n", object->address(), |
1738 HeapObject::cast(forwarded)->address()); | 1738 HeapObject::cast(forwarded)->address()); |
1739 } | 1739 } |
1740 #endif | 1740 #endif |
1741 if (!is_prev_alive) { // Transition from non-live to live. | 1741 if (!is_prev_alive) { // Transition from non-live to live. |
1742 EncodeFreeRegion(free_start, static_cast<int>(current - free_start)); | 1742 EncodeFreeRegion(free_start, static_cast<int>(current - free_start)); |
1743 is_prev_alive = true; | 1743 is_prev_alive = true; |
1744 } | 1744 } |
1745 } else { // Non-live object. | 1745 } else { // Non-live object. |
1746 object_size = object->Size(); | 1746 object_size = object->Size(); |
1747 ProcessNonLive(object); | 1747 ProcessNonLive(object, collector->heap()->isolate()); |
1748 if (is_prev_alive) { // Transition from live to non-live. | 1748 if (is_prev_alive) { // Transition from live to non-live. |
1749 free_start = current; | 1749 free_start = current; |
1750 is_prev_alive = false; | 1750 is_prev_alive = false; |
1751 } | 1751 } |
1752 LiveObjectList::ProcessNonLive(object); | 1752 LiveObjectList::ProcessNonLive(object); |
1753 } | 1753 } |
1754 } | 1754 } |
1755 | 1755 |
1756 // If we ended on a free region, mark it. | 1756 // If we ended on a free region, mark it. |
1757 if (!is_prev_alive) { | 1757 if (!is_prev_alive) { |
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2082 object->ClearMark(); | 2082 object->ClearMark(); |
2083 heap->mark_compact_collector()->tracer()->decrement_marked_count(); | 2083 heap->mark_compact_collector()->tracer()->decrement_marked_count(); |
2084 | 2084 |
2085 if (!is_previous_alive) { // Transition from free to live. | 2085 if (!is_previous_alive) { // Transition from free to live. |
2086 space->DeallocateBlock(free_start, | 2086 space->DeallocateBlock(free_start, |
2087 static_cast<int>(current - free_start), | 2087 static_cast<int>(current - free_start), |
2088 true); | 2088 true); |
2089 is_previous_alive = true; | 2089 is_previous_alive = true; |
2090 } | 2090 } |
2091 } else { | 2091 } else { |
2092 heap->mark_compact_collector()->ReportDeleteIfNeeded(object); | 2092 heap->mark_compact_collector()->ReportDeleteIfNeeded( |
| 2093 object, heap->isolate()); |
2093 if (is_previous_alive) { // Transition from live to free. | 2094 if (is_previous_alive) { // Transition from live to free. |
2094 free_start = current; | 2095 free_start = current; |
2095 is_previous_alive = false; | 2096 is_previous_alive = false; |
2096 } | 2097 } |
2097 LiveObjectList::ProcessNonLive(object); | 2098 LiveObjectList::ProcessNonLive(object); |
2098 } | 2099 } |
2099 // The object is now unmarked for the call to Size() at the top of the | 2100 // The object is now unmarked for the call to Size() at the top of the |
2100 // loop. | 2101 // loop. |
2101 } | 2102 } |
2102 | 2103 |
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3039 if (code_flusher_ != NULL) return; | 3040 if (code_flusher_ != NULL) return; |
3040 code_flusher_ = new CodeFlusher(heap_->isolate()); | 3041 code_flusher_ = new CodeFlusher(heap_->isolate()); |
3041 } else { | 3042 } else { |
3042 if (code_flusher_ == NULL) return; | 3043 if (code_flusher_ == NULL) return; |
3043 delete code_flusher_; | 3044 delete code_flusher_; |
3044 code_flusher_ = NULL; | 3045 code_flusher_ = NULL; |
3045 } | 3046 } |
3046 } | 3047 } |
3047 | 3048 |
3048 | 3049 |
3049 void MarkCompactCollector::ReportDeleteIfNeeded(HeapObject* obj) { | 3050 void MarkCompactCollector::ReportDeleteIfNeeded(HeapObject* obj, |
| 3051 Isolate* isolate) { |
3050 #ifdef ENABLE_GDB_JIT_INTERFACE | 3052 #ifdef ENABLE_GDB_JIT_INTERFACE |
3051 if (obj->IsCode()) { | 3053 if (obj->IsCode()) { |
3052 GDBJITInterface::RemoveCode(reinterpret_cast<Code*>(obj)); | 3054 GDBJITInterface::RemoveCode(reinterpret_cast<Code*>(obj)); |
3053 } | 3055 } |
3054 #endif | 3056 #endif |
3055 #ifdef ENABLE_LOGGING_AND_PROFILING | 3057 #ifdef ENABLE_LOGGING_AND_PROFILING |
3056 if (obj->IsCode()) { | 3058 if (obj->IsCode()) { |
3057 PROFILE(ISOLATE, CodeDeleteEvent(obj->address())); | 3059 PROFILE(isolate, CodeDeleteEvent(obj->address())); |
3058 } | 3060 } |
3059 #endif | 3061 #endif |
3060 } | 3062 } |
3061 | 3063 |
3062 | 3064 |
3063 int MarkCompactCollector::SizeOfMarkedObject(HeapObject* obj) { | 3065 int MarkCompactCollector::SizeOfMarkedObject(HeapObject* obj) { |
3064 MapWord map_word = obj->map_word(); | 3066 MapWord map_word = obj->map_word(); |
3065 map_word.ClearMark(); | 3067 map_word.ClearMark(); |
3066 return obj->SizeFromMap(map_word.ToMap()); | 3068 return obj->SizeFromMap(map_word.ToMap()); |
3067 } | 3069 } |
3068 | 3070 |
3069 | 3071 |
3070 void MarkCompactCollector::Initialize() { | 3072 void MarkCompactCollector::Initialize() { |
3071 StaticPointersToNewGenUpdatingVisitor::Initialize(); | 3073 StaticPointersToNewGenUpdatingVisitor::Initialize(); |
3072 StaticMarkingVisitor::Initialize(); | 3074 StaticMarkingVisitor::Initialize(); |
3073 } | 3075 } |
3074 | 3076 |
3075 | 3077 |
3076 } } // namespace v8::internal | 3078 } } // namespace v8::internal |
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