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