/* | |
* Copyright (C) 2009 Apple Inc. All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions | |
* are met: | |
* 1. Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* 2. Redistributions in binary form must reproduce the above copyright | |
* notice, this list of conditions and the following disclaimer in the | |
* documentation and/or other materials provided with the distribution. | |
* | |
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | |
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR | |
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
*/ | |
#ifndef RepatchBuffer_h | |
#define RepatchBuffer_h | |
#if ENABLE(ASSEMBLER) | |
#include <MacroAssembler.h> | |
#include <wtf/Noncopyable.h> | |
namespace JSC { | |
// RepatchBuffer: | |
// | |
// This class is used to modify code after code generation has been completed, | |
// and after the code has potentially already been executed. This mechanism is | |
// used to apply optimizations to the code. | |
// | |
class RepatchBuffer { | |
typedef MacroAssemblerCodePtr CodePtr; | |
public: | |
RepatchBuffer(CodeBlock* codeBlock) | |
{ | |
JITCode& code = codeBlock->getJITCode(); | |
m_start = code.start(); | |
m_size = code.size(); | |
ExecutableAllocator::makeWritable(m_start, m_size); | |
} | |
~RepatchBuffer() | |
{ | |
ExecutableAllocator::makeExecutable(m_start, m_size); | |
} | |
void relink(CodeLocationJump jump, CodeLocationLabel destination) | |
{ | |
MacroAssembler::repatchJump(jump, destination); | |
} | |
void relink(CodeLocationCall call, CodeLocationLabel destination) | |
{ | |
MacroAssembler::repatchCall(call, destination); | |
} | |
void relink(CodeLocationCall call, FunctionPtr destination) | |
{ | |
MacroAssembler::repatchCall(call, destination); | |
} | |
void relink(CodeLocationNearCall nearCall, CodePtr destination) | |
{ | |
MacroAssembler::repatchNearCall(nearCall, CodeLocationLabel(destination)); | |
} | |
void relink(CodeLocationNearCall nearCall, CodeLocationLabel destination) | |
{ | |
MacroAssembler::repatchNearCall(nearCall, destination); | |
} | |
void repatch(CodeLocationDataLabel32 dataLabel32, int32_t value) | |
{ | |
MacroAssembler::repatchInt32(dataLabel32, value); | |
} | |
void repatch(CodeLocationDataLabelPtr dataLabelPtr, void* value) | |
{ | |
MacroAssembler::repatchPointer(dataLabelPtr, value); | |
} | |
void repatchLoadPtrToLEA(CodeLocationInstruction instruction) | |
{ | |
MacroAssembler::repatchLoadPtrToLEA(instruction); | |
} | |
void relinkCallerToTrampoline(ReturnAddressPtr returnAddress, CodeLocationLabel label) | |
{ | |
relink(CodeLocationCall(CodePtr(returnAddress)), label); | |
} | |
void relinkCallerToTrampoline(ReturnAddressPtr returnAddress, CodePtr newCalleeFunction) | |
{ | |
relinkCallerToTrampoline(returnAddress, CodeLocationLabel(newCalleeFunction)); | |
} | |
void relinkCallerToFunction(ReturnAddressPtr returnAddress, FunctionPtr function) | |
{ | |
relink(CodeLocationCall(CodePtr(returnAddress)), function); | |
} | |
void relinkNearCallerToTrampoline(ReturnAddressPtr returnAddress, CodeLocationLabel label) | |
{ | |
relink(CodeLocationNearCall(CodePtr(returnAddress)), label); | |
} | |
void relinkNearCallerToTrampoline(ReturnAddressPtr returnAddress, CodePtr newCalleeFunction) | |
{ | |
relinkNearCallerToTrampoline(returnAddress, CodeLocationLabel(newCalleeFunction)); | |
} | |
private: | |
void* m_start; | |
size_t m_size; | |
}; | |
} // namespace JSC | |
#endif // ENABLE(ASSEMBLER) | |
#endif // RepatchBuffer_h |