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