jit/JumpReplacementWatchpoint.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 JumpReplacementWatchpoint_h
  27 #define JumpReplacementWatchpoint_h
  28
  29 #include "Watchpoint.h"
  30 #include <wtf/Platform.h>
  31
  32 #if ENABLE(JIT)
  33
  34 #include "CodeLocation.h"
  35 #include "MacroAssembler.h"
  36
  37 namespace JSC {
  38
  39 class JumpReplacementWatchpoint : public Watchpoint {
  40 public:
  41     JumpReplacementWatchpoint()
  42         : m_source(std::numeric_limits<uintptr_t>::max())
  43         , m_destination(std::numeric_limits<uintptr_t>::max())
  44     {
  45     }
  46
  47     JumpReplacementWatchpoint(MacroAssembler::Label source)
  48         : m_source(source.m_label.m_offset)
  49         , m_destination(std::numeric_limits<uintptr_t>::max())
  50     {
  51     }
  52
  53     MacroAssembler::Label sourceLabel() const
  54     {
  55         MacroAssembler::Label label;
  56         label.m_label.m_offset = m_source;
  57         return label;
  58     }
  59
  60     void setDestination(MacroAssembler::Label destination)
  61     {
  62         m_destination = destination.m_label.m_offset;
  63     }
  64
  65     void correctLabels(LinkBuffer&);
  66
  67 protected:
  68     void fireInternal();
  69
  70 private:
  71     uintptr_t m_source;
  72     uintptr_t m_destination;
  73 };
  74
  75 } // namespace JSC
  76
  77 #endif // ENABLE(JIT)
  78
  79 #endif // JumpReplacementWatchpoint_h
  80