heap/CopyVisitorInlines.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. 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 CopyVisitorInlines_h
  27 #define CopyVisitorInlines_h
  28
  29 #include "ClassInfo.h"
  30 #include "CopyVisitor.h"
  31 #include "GCThreadSharedData.h"
  32 #include "JSCell.h"
  33 #include "JSDestructibleObject.h"
  34
  35 namespace JSC {
  36
  37 inline void CopyVisitor::visitItem(CopyWorklistItem item)
  38 {
  39     if (item.token() == ButterflyCopyToken) {
  40         JSObject::copyBackingStore(item.cell(), *this, ButterflyCopyToken);
  41         return;
  42     }
  43
  44     item.cell()->methodTable()->copyBackingStore(item.cell(), *this, item.token());
  45 }
  46
  47 inline bool CopyVisitor::checkIfShouldCopy(void* oldPtr)
  48 {
  49     CopiedBlock* block = CopiedSpace::blockFor(oldPtr);
  50     if (block->isOversize() || block->isPinned())
  51         return false;
  52     return true;
  53 }
  54
  55 inline void* CopyVisitor::allocateNewSpace(size_t bytes)
  56 {
  57     void* result = 0; // Compilers don't realize that this will be assigned.
  58     if (LIKELY(m_copiedAllocator.tryAllocateDuringCopying(bytes, &result)))
  59         return result;
  60
  61     result = allocateNewSpaceSlow(bytes);
  62     ASSERT(result);
  63     return result;
  64 }
  65
  66 inline void* CopyVisitor::allocateNewSpaceSlow(size_t bytes)
  67 {
  68     CopiedBlock* newBlock = 0;
  69     m_shared.m_copiedSpace->doneFillingBlock(m_copiedAllocator.resetCurrentBlock(), &newBlock);
  70     m_copiedAllocator.setCurrentBlock(newBlock);
  71
  72     void* result = 0;
  73     CheckedBoolean didSucceed = m_copiedAllocator.tryAllocateDuringCopying(bytes, &result);
  74     ASSERT(didSucceed);
  75     return result;
  76 }
  77
  78 inline void CopyVisitor::startCopying()
  79 {
  80     ASSERT(!m_copiedAllocator.isValid());
  81     CopiedBlock* block = 0;
  82     m_shared.m_copiedSpace->doneFillingBlock(m_copiedAllocator.resetCurrentBlock(), &block);
  83     m_copiedAllocator.setCurrentBlock(block);
  84 }
  85
  86 inline void CopyVisitor::doneCopying()
  87 {
  88     if (!m_copiedAllocator.isValid())
  89         return;
  90
  91     m_shared.m_copiedSpace->doneFillingBlock(m_copiedAllocator.resetCurrentBlock(), 0);
  92 }
  93
  94 inline void CopyVisitor::didCopy(void* ptr, size_t bytes)
  95 {
  96     CopiedBlock* block = CopiedSpace::blockFor(ptr);
  97     ASSERT(!block->isOversize());
  98     ASSERT(!block->isPinned());
  99
 100     block->didEvacuateBytes(bytes);
 101 }
 102
 103 } // namespace JSC
 104
 105 #endif // CopyVisitorInlines_h
 106