heap/IncrementalSweeper.h

   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. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef IncrementalSweeper_h
  27 #define IncrementalSweeper_h
  28
  29 #include "HeapTimer.h"
  30 #include "MarkedBlock.h"
  31 #include <wtf/HashSet.h>
  32 #include <wtf/PassOwnPtr.h>
  33 #include <wtf/RetainPtr.h>
  34 #include <wtf/Vector.h>
  35
  36 namespace JSC {
  37
  38 class Heap;
  39
  40 class IncrementalSweeper : public HeapTimer {
  41 public:
  42     static PassOwnPtr<IncrementalSweeper> create(Heap*);
  43     void startSweeping(Vector<MarkedBlock*>&);
  44 #if PLATFORM(IOS)
  45     JS_EXPORT_PRIVATE virtual void doWork();
  46 #else
  47     virtual void doWork();
  48 #endif
  49     void sweepNextBlock();
  50     void willFinishSweeping();
  51
  52 #if USE(CF) || PLATFORM(BLACKBERRY) || PLATFORM(QT)
  53 #if USE(CF)
  54 protected:
  55     JS_EXPORT_PRIVATE IncrementalSweeper(Heap*, CFRunLoopRef);
  56 #else
  57 private:
  58     IncrementalSweeper(Heap*);
  59 #endif
  60
  61 private:
  62     void doSweep(double startTime);
  63     void scheduleTimer();
  64     void cancelTimer();
  65
  66     unsigned m_currentBlockToSweepIndex;
  67     Vector<MarkedBlock*>& m_blocksToSweep;
  68 #else
  69
  70 private:
  71     IncrementalSweeper(VM*);
  72
  73 #endif
  74 };
  75
  76 } // namespace JSC
  77
  78 #endif