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      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
      4 // met:
      5 //
      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.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     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
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #ifndef V8_MARK_COMPACT_INL_H_
     29 #define V8_MARK_COMPACT_INL_H_
     30 
     31 #include "isolate.h"
     32 #include "memory.h"
     33 #include "mark-compact.h"
     34 
     35 
     36 namespace v8 {
     37 namespace internal {
     38 
     39 
     40 MarkBit Marking::MarkBitFrom(Address addr) {
     41   MemoryChunk* p = MemoryChunk::FromAddress(addr);
     42   return p->markbits()->MarkBitFromIndex(p->AddressToMarkbitIndex(addr),
     43                                          p->ContainsOnlyData());
     44 }
     45 
     46 
     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);
     52 }
     53 
     54 
     55 void MarkCompactCollector::MarkObject(HeapObject* obj, MarkBit mark_bit) {
     56   ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
     57   if (!mark_bit.Get()) {
     58     mark_bit.Set();
     59     MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
     60     ASSERT(IsMarked(obj));
     61     ASSERT(obj->GetIsolate()->heap()->Contains(obj));
     62     marking_deque_.PushBlack(obj);
     63   }
     64 }
     65 
     66 
     67 void MarkCompactCollector::SetMark(HeapObject* obj, MarkBit mark_bit) {
     68   ASSERT(!mark_bit.Get());
     69   ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
     70   mark_bit.Set();
     71   MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
     72 }
     73 
     74 
     75 bool MarkCompactCollector::IsMarked(Object* obj) {
     76   ASSERT(obj->IsHeapObject());
     77   HeapObject* heap_object = HeapObject::cast(obj);
     78   return Marking::MarkBitFrom(heap_object).Get();
     79 }
     80 
     81 
     82 void MarkCompactCollector::RecordSlot(Object** anchor_slot,
     83                                       Object** slot,
     84                                       Object* object) {
     85   Page* object_page = Page::FromAddress(reinterpret_cast<Address>(object));
     86   if (object_page->IsEvacuationCandidate() &&
     87       !ShouldSkipEvacuationSlotRecording(anchor_slot)) {
     88     if (!SlotsBuffer::AddTo(&slots_buffer_allocator_,
     89                             object_page->slots_buffer_address(),
     90                             slot,
     91                             SlotsBuffer::FAIL_ON_OVERFLOW)) {
     92       EvictEvacuationCandidate(object_page);
     93     }
     94   }
     95 }
     96 
     97 
     98 } }  // namespace v8::internal
     99 
    100 #endif  // V8_MARK_COMPACT_INL_H_
    101