heap/DFGCodeBlocks.cpp

   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 #include "config.h"
  27 #include "DFGCodeBlocks.h"
  28
  29 #include "CodeBlock.h"
  30 #include "SlotVisitor.h"
  31 #include <wtf/Vector.h>
  32
  33 namespace JSC {
  34
  35 #if ENABLE(DFG_JIT)
  36
  37 DFGCodeBlocks::DFGCodeBlocks() { }
  38
  39 DFGCodeBlocks::~DFGCodeBlocks()
  40 {
  41     Vector<CodeBlock*, 16> toRemove;
  42
  43     for (HashSet<CodeBlock*>::iterator iter = m_set.begin(); iter != m_set.end(); ++iter) {
  44         if ((*iter)->m_dfgData->isJettisoned)
  45             toRemove.append(*iter);
  46     }
  47
  48     WTF::deleteAllValues(toRemove);
  49 }
  50
  51 void DFGCodeBlocks::jettison(PassOwnPtr<CodeBlock> codeBlockPtr)
  52 {
  53     // We don't want to delete it now; we just want its pointer.
  54     CodeBlock* codeBlock = codeBlockPtr.leakPtr();
  55
  56     ASSERT(codeBlock);
  57     ASSERT(codeBlock->getJITType() == JITCode::DFGJIT);
  58
  59     // It should not have already been jettisoned.
  60     ASSERT(!codeBlock->m_dfgData->isJettisoned);
  61
  62     // We should have this block already.
  63     ASSERT(m_set.find(codeBlock) != m_set.end());
  64
  65     codeBlock->m_dfgData->isJettisoned = true;
  66 }
  67
  68 void DFGCodeBlocks::clearMarks()
  69 {
  70     for (HashSet<CodeBlock*>::iterator iter = m_set.begin(); iter != m_set.end(); ++iter) {
  71         (*iter)->m_dfgData->mayBeExecuting = false;
  72         (*iter)->m_dfgData->visitAggregateHasBeenCalled = false;
  73     }
  74 }
  75
  76 void DFGCodeBlocks::deleteUnmarkedJettisonedCodeBlocks()
  77 {
  78     Vector<CodeBlock*, 16> toRemove;
  79
  80     for (HashSet<CodeBlock*>::iterator iter = m_set.begin(); iter != m_set.end(); ++iter) {
  81         if ((*iter)->m_dfgData->isJettisoned && !(*iter)->m_dfgData->mayBeExecuting)
  82             toRemove.append(*iter);
  83     }
  84
  85     WTF::deleteAllValues(toRemove);
  86 }
  87
  88 void DFGCodeBlocks::traceMarkedCodeBlocks(SlotVisitor& visitor)
  89 {
  90     for (HashSet<CodeBlock*>::iterator iter = m_set.begin(); iter != m_set.end(); ++iter) {
  91         if ((*iter)->m_dfgData->mayBeExecuting)
  92             (*iter)->visitAggregate(visitor);
  93     }
  94 }
  95
  96 #else // ENABLE(DFG_JIT)
  97
  98 void DFGCodeBlocks::jettison(PassOwnPtr<CodeBlock>)
  99 {
 100 }
 101
 102 #endif // ENABLE(DFG_JIT)
 103
 104 } // namespace JSC
 105
 106