dfg/DFGDesiredWeakReferences.cpp

   1 /*
   2  * Copyright (C) 2013, 2014 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 #include "config.h"
  27 #include "DFGDesiredWeakReferences.h"
  28
  29 #if ENABLE(DFG_JIT)
  30
  31 #include "CodeBlock.h"
  32 #include "DFGCommonData.h"
  33 #include "JSCInlines.h"
  34
  35 namespace JSC { namespace DFG {
  36
  37 DesiredWeakReferences::DesiredWeakReferences()
  38     : m_codeBlock(nullptr)
  39 {
  40 }
  41
  42 DesiredWeakReferences::DesiredWeakReferences(CodeBlock* codeBlock)
  43     : m_codeBlock(codeBlock)
  44 {
  45 }
  46
  47 DesiredWeakReferences::~DesiredWeakReferences()
  48 {
  49 }
  50
  51 void DesiredWeakReferences::addLazily(JSCell* cell)
  52 {
  53     m_references.add(cell);
  54 }
  55
  56 bool DesiredWeakReferences::contains(JSCell* cell)
  57 {
  58     return m_references.contains(cell);
  59 }
  60
  61 void DesiredWeakReferences::reallyAdd(VM& vm, CommonData* common)
  62 {
  63     for (JSCell* target : m_references) {
  64         if (Structure* structure = jsDynamicCast<Structure*>(target)) {
  65             common->weakStructureReferences.append(
  66                 WriteBarrier<Structure>(vm, m_codeBlock->ownerExecutable(), structure));
  67         } else {
  68             common->weakReferences.append(
  69                 WriteBarrier<JSCell>(vm, m_codeBlock->ownerExecutable(), target));
  70         }
  71     }
  72 }
  73
  74 void DesiredWeakReferences::visitChildren(SlotVisitor& visitor)
  75 {
  76     for (JSCell* target : m_references)
  77         visitor.appendUnbarrieredPointer(&target);
  78 }
  79
  80 } } // namespace JSC::DFG
  81
  82 #endif // ENABLE(DFG_JIT)