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
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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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 void MarkCompactCollector::MarkObject(HeapObject* obj, MarkBit mark_bit) {
56 ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
57 if (!mark_bit.Get()) {
59 MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
60 ASSERT(IsMarked(obj));
61 ASSERT(obj->GetIsolate()->heap()->Contains(obj));
62 marking_deque_.PushBlack(obj);
67 void MarkCompactCollector::SetMark(HeapObject* obj, MarkBit mark_bit) {
68 ASSERT(!mark_bit.Get());
69 ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
71 MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
75 bool MarkCompactCollector::IsMarked(Object* obj) {
76 ASSERT(obj->IsHeapObject());
77 HeapObject* heap_object = HeapObject::cast(obj);
78 return Marking::MarkBitFrom(heap_object).Get();
82 void MarkCompactCollector::RecordSlot(Object** anchor_slot,
85 SlotsBuffer::AdditionMode mode) {
86 Page* object_page = Page::FromAddress(reinterpret_cast<Address>(object));
87 if (object_page->IsEvacuationCandidate() &&
88 !ShouldSkipEvacuationSlotRecording(anchor_slot)) {
89 if (!SlotsBuffer::AddTo(&slots_buffer_allocator_,
90 object_page->slots_buffer_address(),
93 EvictEvacuationCandidate(object_page);
99 } } // namespace v8::internal
101 #endif // V8_MARK_COMPACT_INL_H_