heap/CopiedBlockInlines.h

   1 /*
   2  * Copyright (C) 2012, 2013 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef CopiedBlockInlines_h
  27 #define CopiedBlockInlines_h
  28
  29 #include "ClassInfo.h"
  30 #include "CopiedBlock.h"
  31 #include "Heap.h"
  32 #include "MarkedBlock.h"
  33
  34 namespace JSC {
  35
  36 inline bool CopiedBlock::shouldReportLiveBytes(SpinLockHolder&, JSCell* owner)
  37 {
  38     // We want to add to live bytes if the owner isn't part of the remembered set or
  39     // if this block was allocated during the last cycle.
  40     // If we always added live bytes we would double count for elements in the remembered
  41     // set across collections.
  42     // If we didn't always add live bytes to new blocks, we'd get too few.
  43     return !Heap::isRemembered(owner) || !m_isOld;
  44 }
  45
  46 inline void CopiedBlock::reportLiveBytes(SpinLockHolder&, JSCell* owner, CopyToken token, unsigned bytes)
  47 {
  48     checkConsistency();
  49 #ifndef NDEBUG
  50     m_liveObjects++;
  51 #endif
  52     m_liveBytes += bytes;
  53     checkConsistency();
  54     ASSERT(m_liveBytes <= CopiedBlock::blockSize);
  55
  56     if (isPinned())
  57         return;
  58
  59     if (!shouldEvacuate()) {
  60         pin();
  61         return;
  62     }
  63
  64     if (!m_workList)
  65         m_workList = adoptPtr(new CopyWorkList(Heap::heap(owner)->blockAllocator()));
  66
  67     m_workList->append(CopyWorklistItem(owner, token));
  68 }
  69
  70 inline void CopiedBlock::reportLiveBytesDuringCopying(unsigned bytes)
  71 {
  72     checkConsistency();
  73     // This doesn't need to be locked because the thread that calls this function owns the current block.
  74     m_isOld = true;
  75 #ifndef NDEBUG
  76     m_liveObjects++;
  77 #endif
  78     m_liveBytes += bytes;
  79     checkConsistency();
  80     ASSERT(m_liveBytes <= CopiedBlock::blockSize);
  81 }
  82
  83 } // namespace JSC
  84
  85 #endif // CopiedBlockInlines_h