1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
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13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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28 #ifndef V8_MARK_COMPACT_INL_H_
29 #define V8_MARK_COMPACT_INL_H_
33 #include "mark-compact.h"
40 MarkBit Marking::MarkBitFrom(Address addr) {
41 MemoryChunk* p = MemoryChunk::FromAddress(addr);
42 return p->markbits()->MarkBitFromIndex(p->AddressToMarkbitIndex(addr),
43 p->ContainsOnlyData());
47 void MarkCompactCollector::SetFlags(int flags) {
48 sweep_precisely_ = ((flags & Heap::kSweepPreciselyMask) != 0);
49 reduce_memory_footprint_ = ((flags & Heap::kReduceMemoryFootprintMask) != 0);
50 abort_incremental_marking_ =
51 ((flags & Heap::kAbortIncrementalMarkingMask) != 0);
55 bool MarkCompactCollector::MarkObjectAndPush(HeapObject* obj) {
56 if (MarkObjectWithoutPush(obj)) {
57 marking_deque_.PushBlack(obj);
64 void MarkCompactCollector::MarkObject(HeapObject* obj, MarkBit mark_bit) {
65 ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
66 if (!mark_bit.Get()) {
68 MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
69 ProcessNewlyMarkedObject(obj);
74 bool MarkCompactCollector::MarkObjectWithoutPush(HeapObject* obj) {
75 MarkBit mark_bit = Marking::MarkBitFrom(obj);
76 if (!mark_bit.Get()) {
77 SetMark(obj, mark_bit);
84 void MarkCompactCollector::SetMark(HeapObject* obj, MarkBit mark_bit) {
85 ASSERT(!mark_bit.Get());
86 ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
88 MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
90 heap_->ClearCacheOnMap(Map::cast(obj));
95 bool MarkCompactCollector::IsMarked(Object* obj) {
96 ASSERT(obj->IsHeapObject());
97 HeapObject* heap_object = HeapObject::cast(obj);
98 return Marking::MarkBitFrom(heap_object).Get();
102 void MarkCompactCollector::RecordSlot(Object** anchor_slot,
105 Page* object_page = Page::FromAddress(reinterpret_cast<Address>(object));
106 if (object_page->IsEvacuationCandidate() &&
107 !ShouldSkipEvacuationSlotRecording(anchor_slot)) {
108 if (!SlotsBuffer::AddTo(&slots_buffer_allocator_,
109 object_page->slots_buffer_address(),
111 SlotsBuffer::FAIL_ON_OVERFLOW)) {
112 EvictEvacuationCandidate(object_page);
118 } } // namespace v8::internal
120 #endif // V8_MARK_COMPACT_INL_H_