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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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