heap/CopiedSpace.h

   1 /*
   2  * Copyright (C) 2011 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 CopiedSpace_h
  27 #define CopiedSpace_h
  28
  29 #include "CopiedAllocator.h"
  30 #include "HeapBlock.h"
  31 #include "TinyBloomFilter.h"
  32 #include <wtf/Assertions.h>
  33 #include <wtf/CheckedBoolean.h>
  34 #include <wtf/DoublyLinkedList.h>
  35 #include <wtf/HashSet.h>
  36 #include <wtf/OSAllocator.h>
  37 #include <wtf/PageAllocationAligned.h>
  38 #include <wtf/PageBlock.h>
  39 #include <wtf/StdLibExtras.h>
  40 #include <wtf/TCSpinLock.h>
  41 #include <wtf/ThreadingPrimitives.h>
  42
  43 namespace JSC {
  44
  45 class Heap;
  46 class CopiedBlock;
  47
  48 class CopiedSpace {
  49     friend class CopyVisitor;
  50     friend class GCThreadSharedData;
  51     friend class SlotVisitor;
  52     friend class JIT;
  53 public:
  54     CopiedSpace(Heap*);
  55     ~CopiedSpace();
  56     void init();
  57
  58     CheckedBoolean tryAllocate(size_t, void**);
  59     CheckedBoolean tryReallocate(void**, size_t, size_t);
  60
  61     CopiedAllocator& allocator() { return m_allocator; }
  62
  63     void startedCopying();
  64     void doneCopying();
  65     bool isInCopyPhase() { return m_inCopyingPhase; }
  66
  67     void pin(CopiedBlock*);
  68     bool isPinned(void*);
  69
  70     bool contains(CopiedBlock*);
  71     bool contains(void*, CopiedBlock*&);
  72
  73     void pinIfNecessary(void* pointer);
  74
  75     size_t size();
  76     size_t capacity();
  77
  78     bool isPagedOut(double deadline);
  79     bool shouldDoCopyPhase() { return m_shouldDoCopyPhase; }
  80
  81     static CopiedBlock* blockFor(void*);
  82
  83 private:
  84     static bool isOversize(size_t);
  85
  86     JS_EXPORT_PRIVATE CheckedBoolean tryAllocateSlowCase(size_t, void**);
  87     CheckedBoolean tryAllocateOversize(size_t, void**);
  88     CheckedBoolean tryReallocateOversize(void**, size_t, size_t);
  89
  90     void allocateBlock();
  91     CopiedBlock* allocateBlockForCopyingPhase();
  92
  93     void doneFillingBlock(CopiedBlock*, CopiedBlock**);
  94     void recycleEvacuatedBlock(CopiedBlock*);
  95     void recycleBorrowedBlock(CopiedBlock*);
  96
  97     Heap* m_heap;
  98
  99     CopiedAllocator m_allocator;
 100
 101     TinyBloomFilter m_blockFilter;
 102     HashSet<CopiedBlock*> m_blockSet;
 103
 104     SpinLock m_toSpaceLock;
 105
 106     DoublyLinkedList<CopiedBlock>* m_toSpace;
 107     DoublyLinkedList<CopiedBlock>* m_fromSpace;
 108
 109     DoublyLinkedList<CopiedBlock> m_blocks1;
 110     DoublyLinkedList<CopiedBlock> m_blocks2;
 111     DoublyLinkedList<CopiedBlock> m_oversizeBlocks;
 112
 113     bool m_inCopyingPhase;
 114     bool m_shouldDoCopyPhase;
 115
 116     Mutex m_loanedBlocksLock;
 117     ThreadCondition m_loanedBlocksCondition;
 118     size_t m_numberOfLoanedBlocks;
 119
 120     static const size_t s_maxAllocationSize = CopiedBlock::blockSize / 2;
 121     static const size_t s_initialBlockNum = 16;
 122     static const size_t s_blockMask = ~(CopiedBlock::blockSize - 1);
 123 };
 124
 125 } // namespace JSC
 126
 127 #endif