jit/JumpReplacementWatchpoint.cpp

   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 #include "config.h"
  27 #include "JumpReplacementWatchpoint.h"
  28
  29 #if ENABLE(JIT)
  30
  31 #include "LinkBuffer.h"
  32 #include "Options.h"
  33
  34 namespace JSC {
  35
  36 void JumpReplacementWatchpoint::correctLabels(LinkBuffer& linkBuffer)
  37 {
  38     MacroAssembler::Label label;
  39     label.m_label.m_offset = m_source;
  40     m_source = bitwise_cast<uintptr_t>(linkBuffer.locationOf(label).dataLocation());
  41     label.m_label.m_offset = m_destination;
  42     m_destination = bitwise_cast<uintptr_t>(linkBuffer.locationOf(label).dataLocation());
  43 }
  44
  45 void JumpReplacementWatchpoint::fireInternal()
  46 {
  47     void* source = bitwise_cast<void*>(m_source);
  48     void* destination = bitwise_cast<void*>(m_destination);
  49     if (Options::showDisassembly())
  50         dataLogF("Firing jump replacement watchpoint from %p, to %p.\n", source, destination);
  51     MacroAssembler::replaceWithJump(CodeLocationLabel(source), CodeLocationLabel(destination));
  52     if (isOnList())
  53         remove();
  54 }
  55
  56 } // namespace JSC
  57
  58 #endif // ENABLE(JIT)
  59