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// Copyright 2012 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_MARK_COMPACT_INL_H_
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#define V8_MARK_COMPACT_INL_H_
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#include "mark-compact.h"
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MarkBit Marking::MarkBitFrom(Address addr) {
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MemoryChunk* p = MemoryChunk::FromAddress(addr);
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return p->markbits()->MarkBitFromIndex(p->AddressToMarkbitIndex(addr),
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p->ContainsOnlyData());
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void MarkCompactCollector::SetFlags(int flags) {
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sweep_precisely_ = ((flags & Heap::kSweepPreciselyMask) != 0);
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reduce_memory_footprint_ = ((flags & Heap::kReduceMemoryFootprintMask) != 0);
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abort_incremental_marking_ =
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((flags & Heap::kAbortIncrementalMarkingMask) != 0);
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bool MarkCompactCollector::MarkObjectAndPush(HeapObject* obj) {
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if (MarkObjectWithoutPush(obj)) {
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marking_deque_.PushBlack(obj);
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void MarkCompactCollector::MarkObject(HeapObject* obj, MarkBit mark_bit) {
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ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
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if (!mark_bit.Get()) {
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MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
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ProcessNewlyMarkedObject(obj);
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bool MarkCompactCollector::MarkObjectWithoutPush(HeapObject* obj) {
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MarkBit mark_bit = Marking::MarkBitFrom(obj);
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if (!mark_bit.Get()) {
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SetMark(obj, mark_bit);
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void MarkCompactCollector::SetMark(HeapObject* obj, MarkBit mark_bit) {
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ASSERT(!mark_bit.Get());
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ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
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MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
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heap_->ClearCacheOnMap(Map::cast(obj));
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bool MarkCompactCollector::IsMarked(Object* obj) {
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ASSERT(obj->IsHeapObject());
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HeapObject* heap_object = HeapObject::cast(obj);
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return Marking::MarkBitFrom(heap_object).Get();
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void MarkCompactCollector::RecordSlot(Object** anchor_slot,
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Page* object_page = Page::FromAddress(reinterpret_cast<Address>(object));
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if (object_page->IsEvacuationCandidate() &&
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!ShouldSkipEvacuationSlotRecording(anchor_slot)) {
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if (!SlotsBuffer::AddTo(&slots_buffer_allocator_,
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object_page->slots_buffer_address(),
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SlotsBuffer::FAIL_ON_OVERFLOW)) {
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EvictEvacuationCandidate(object_page);
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} } // namespace v8::internal
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#endif // V8_MARK_COMPACT_INL_H_