heap/CopyVisitor.cpp

   1 /*
   2  * Copyright (C) 2012 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 #include "config.h"
  27 #include "CopyVisitor.h"
  28
  29 #include "CopyVisitorInlines.h"
  30 #include "CopyWorkList.h"
  31 #include "GCThreadSharedData.h"
  32 #include "JSCell.h"
  33 #include "JSObject.h"
  34 #include <wtf/Threading.h>
  35
  36 namespace JSC {
  37
  38 CopyVisitor::CopyVisitor(GCThreadSharedData& shared)
  39     : m_shared(shared)
  40 {
  41 }
  42
  43 void CopyVisitor::copyFromShared()
  44 {
  45     size_t next, end;
  46     m_shared.getNextBlocksToCopy(next, end);
  47     while (next < end) {
  48         for (; next < end; ++next) {
  49             CopiedBlock* block = m_shared.m_blocksToCopy[next];
  50             if (!block->hasWorkList())
  51                 continue;
  52
  53             CopyWorkList& workList = block->workList();
  54             for (CopyWorkList::iterator it = workList.begin(); it != workList.end(); ++it)
  55                 visitCell(*it);
  56
  57             ASSERT(!block->liveBytes());
  58             m_shared.m_copiedSpace->recycleEvacuatedBlock(block);
  59         }
  60         m_shared.getNextBlocksToCopy(next, end);
  61     }
  62     ASSERT(next == end);
  63 }
  64
  65 } // namespace JSC