bytecode/StructureStubClearingWatchpoint.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. ``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 #ifndef StructureStubClearingWatchpoint_h
  27 #define StructureStubClearingWatchpoint_h
  28
  29 #include "Watchpoint.h"
  30 #include <wtf/Platform.h>
  31
  32 #if ENABLE(JIT)
  33
  34 #include <wtf/FastAllocBase.h>
  35 #include <wtf/Noncopyable.h>
  36 #include <wtf/OwnPtr.h>
  37 #include <wtf/PassOwnPtr.h>
  38 #include <wtf/RefCounted.h>
  39 #include <wtf/RefPtr.h>
  40
  41 namespace JSC {
  42
  43 class CodeBlock;
  44 class WatchpointsOnStructureStubInfo;
  45 struct StructureStubInfo;
  46
  47 class StructureStubClearingWatchpoint : public Watchpoint {
  48     WTF_MAKE_NONCOPYABLE(StructureStubClearingWatchpoint);
  49     WTF_MAKE_FAST_ALLOCATED;
  50 public:
  51     StructureStubClearingWatchpoint(
  52         WatchpointsOnStructureStubInfo& holder)
  53         : m_holder(holder)
  54     {
  55     }
  56
  57     StructureStubClearingWatchpoint(
  58         WatchpointsOnStructureStubInfo& holder,
  59         PassOwnPtr<StructureStubClearingWatchpoint> next)
  60         : m_holder(holder)
  61         , m_next(next)
  62     {
  63     }
  64
  65     virtual ~StructureStubClearingWatchpoint();
  66
  67     static StructureStubClearingWatchpoint* push(
  68         WatchpointsOnStructureStubInfo& holder,
  69         OwnPtr<StructureStubClearingWatchpoint>& head);
  70
  71 protected:
  72     void fireInternal();
  73
  74 private:
  75     WatchpointsOnStructureStubInfo& m_holder;
  76     OwnPtr<StructureStubClearingWatchpoint> m_next;
  77 };
  78
  79 class WatchpointsOnStructureStubInfo : public RefCounted<WatchpointsOnStructureStubInfo> {
  80 public:
  81     WatchpointsOnStructureStubInfo(CodeBlock* codeBlock, StructureStubInfo* stubInfo)
  82         : m_codeBlock(codeBlock)
  83         , m_stubInfo(stubInfo)
  84     {
  85     }
  86
  87     ~WatchpointsOnStructureStubInfo();
  88
  89     StructureStubClearingWatchpoint* addWatchpoint();
  90
  91     static StructureStubClearingWatchpoint* ensureReferenceAndAddWatchpoint(
  92         RefPtr<WatchpointsOnStructureStubInfo>& holderRef,
  93         CodeBlock*, StructureStubInfo*);
  94
  95     CodeBlock* codeBlock() const { return m_codeBlock; }
  96     StructureStubInfo* stubInfo() const { return m_stubInfo; }
  97
  98 private:
  99     CodeBlock* m_codeBlock;
 100     StructureStubInfo* m_stubInfo;
 101     OwnPtr<StructureStubClearingWatchpoint> m_head;
 102 };
 103
 104 } // namespace JSC
 105
 106 #endif // ENABLE(JIT)
 107
 108 #endif // StructureStubClearingWatchpoint_h
 109