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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef V8_MARK_COMPACT_INL_H_
      6 #define V8_MARK_COMPACT_INL_H_
      7 
      8 #include <memory.h>
      9 
     10 #include "src/isolate.h"
     11 #include "src/mark-compact.h"
     12 
     13 
     14 namespace v8 {
     15 namespace internal {
     16 
     17 
     18 MarkBit Marking::MarkBitFrom(Address addr) {
     19   MemoryChunk* p = MemoryChunk::FromAddress(addr);
     20   return p->markbits()->MarkBitFromIndex(p->AddressToMarkbitIndex(addr),
     21                                          p->ContainsOnlyData());
     22 }
     23 
     24 
     25 void MarkCompactCollector::SetFlags(int flags) {
     26   sweep_precisely_ = ((flags & Heap::kSweepPreciselyMask) != 0);
     27   reduce_memory_footprint_ = ((flags & Heap::kReduceMemoryFootprintMask) != 0);
     28   abort_incremental_marking_ =
     29       ((flags & Heap::kAbortIncrementalMarkingMask) != 0);
     30 }
     31 
     32 
     33 void MarkCompactCollector::MarkObject(HeapObject* obj, MarkBit mark_bit) {
     34   ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
     35   if (!mark_bit.Get()) {
     36     mark_bit.Set();
     37     MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
     38     ASSERT(IsMarked(obj));
     39     ASSERT(obj->GetIsolate()->heap()->Contains(obj));
     40     marking_deque_.PushBlack(obj);
     41   }
     42 }
     43 
     44 
     45 void MarkCompactCollector::SetMark(HeapObject* obj, MarkBit mark_bit) {
     46   ASSERT(!mark_bit.Get());
     47   ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
     48   mark_bit.Set();
     49   MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
     50 }
     51 
     52 
     53 bool MarkCompactCollector::IsMarked(Object* obj) {
     54   ASSERT(obj->IsHeapObject());
     55   HeapObject* heap_object = HeapObject::cast(obj);
     56   return Marking::MarkBitFrom(heap_object).Get();
     57 }
     58 
     59 
     60 void MarkCompactCollector::RecordSlot(Object** anchor_slot,
     61                                       Object** slot,
     62                                       Object* object,
     63                                       SlotsBuffer::AdditionMode mode) {
     64   Page* object_page = Page::FromAddress(reinterpret_cast<Address>(object));
     65   if (object_page->IsEvacuationCandidate() &&
     66       !ShouldSkipEvacuationSlotRecording(anchor_slot)) {
     67     if (!SlotsBuffer::AddTo(&slots_buffer_allocator_,
     68                             object_page->slots_buffer_address(),
     69                             slot,
     70                             mode)) {
     71       EvictEvacuationCandidate(object_page);
     72     }
     73   }
     74 }
     75 
     76 
     77 } }  // namespace v8::internal
     78 
     79 #endif  // V8_MARK_COMPACT_INL_H_
     80