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