heap/DelayedReleaseScope.h

   1 /*
   2  * Copyright (C) 2013 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 DelayedReleaseScope_h
  27 #define DelayedReleaseScope_h
  28
  29 #include "Heap.h"
  30 #include "JSLock.h"
  31 #include "MarkedSpace.h"
  32
  33 namespace JSC {
  34
  35 #if USE(CF)
  36
  37 class DelayedReleaseScope {
  38 public:
  39     DelayedReleaseScope(MarkedSpace& markedSpace)
  40         : m_markedSpace(markedSpace)
  41     {
  42         ASSERT(!m_markedSpace.m_currentDelayedReleaseScope);
  43         m_markedSpace.m_currentDelayedReleaseScope = this;
  44     }
  45
  46     ~DelayedReleaseScope()
  47     {
  48         ASSERT(m_markedSpace.m_currentDelayedReleaseScope == this);
  49         m_markedSpace.m_currentDelayedReleaseScope = nullptr;
  50
  51         HeapOperation operationInProgress = NoOperation;
  52         std::swap(operationInProgress, m_markedSpace.m_heap->m_operationInProgress);
  53
  54         {
  55             JSLock::DropAllLocks dropAllLocks(*m_markedSpace.m_heap->vm());
  56             m_delayedReleaseObjects.clear();
  57         }
  58
  59         std::swap(operationInProgress, m_markedSpace.m_heap->m_operationInProgress);
  60     }
  61
  62     template <typename T>
  63     void releaseSoon(RetainPtr<T>&& object)
  64     {
  65         m_delayedReleaseObjects.append(WTF::move(object));
  66     }
  67
  68     static bool isInEffectFor(MarkedSpace& markedSpace)
  69     {
  70         return markedSpace.m_currentDelayedReleaseScope;
  71     }
  72
  73 private:
  74     MarkedSpace& m_markedSpace;
  75     Vector<RetainPtr<CFTypeRef>> m_delayedReleaseObjects;
  76 };
  77
  78 template <typename T>
  79 inline void MarkedSpace::releaseSoon(RetainPtr<T>&& object)
  80 {
  81     ASSERT(m_currentDelayedReleaseScope);
  82     m_currentDelayedReleaseScope->releaseSoon(WTF::move(object));
  83 }
  84
  85 #else // USE(CF)
  86
  87 class DelayedReleaseScope {
  88 public:
  89     DelayedReleaseScope(MarkedSpace&)
  90     {
  91     }
  92
  93     static bool isInEffectFor(MarkedSpace&)
  94     {
  95         return true;
  96     }
  97 };
  98
  99 #endif // USE(CF)
 100
 101 } // namespace JSC
 102
 103 #endif // DelayedReleaseScope_h