2 * Copyright (C) 2009 Apple Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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
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11 * documentation and/or other materials provided with the distribution.
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
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26 #ifndef RepatchBuffer_h
27 #define RepatchBuffer_h
31 #include "CodeBlock.h"
32 #include <MacroAssembler.h>
33 #include <wtf/Noncopyable.h>
39 // This class is used to modify code after code generation has been completed,
40 // and after the code has potentially already been executed. This mechanism is
41 // used to apply optimizations to the code.
44 typedef MacroAssemblerCodePtr CodePtr;
47 RepatchBuffer(CodeBlock* codeBlock)
49 JITCode& code = codeBlock->getJITCode();
50 m_start = code.start();
53 ExecutableAllocator::makeWritable(m_start, m_size);
58 ExecutableAllocator::makeExecutable(m_start, m_size);
61 void relink(CodeLocationJump jump, CodeLocationLabel destination)
63 MacroAssembler::repatchJump(jump, destination);
66 void relink(CodeLocationCall call, CodeLocationLabel destination)
68 MacroAssembler::repatchCall(call, destination);
71 void relink(CodeLocationCall call, FunctionPtr destination)
73 MacroAssembler::repatchCall(call, destination);
76 void relink(CodeLocationNearCall nearCall, CodePtr destination)
78 MacroAssembler::repatchNearCall(nearCall, CodeLocationLabel(destination));
81 void relink(CodeLocationNearCall nearCall, CodeLocationLabel destination)
83 MacroAssembler::repatchNearCall(nearCall, destination);
86 void repatch(CodeLocationDataLabel32 dataLabel32, int32_t value)
88 MacroAssembler::repatchInt32(dataLabel32, value);
91 void repatch(CodeLocationDataLabelCompact dataLabelCompact, int32_t value)
93 MacroAssembler::repatchCompact(dataLabelCompact, value);
96 void repatch(CodeLocationDataLabelPtr dataLabelPtr, void* value)
98 MacroAssembler::repatchPointer(dataLabelPtr, value);
101 void relinkCallerToTrampoline(ReturnAddressPtr returnAddress, CodeLocationLabel label)
103 relink(CodeLocationCall(CodePtr(returnAddress)), label);
106 void relinkCallerToTrampoline(ReturnAddressPtr returnAddress, CodePtr newCalleeFunction)
108 relinkCallerToTrampoline(returnAddress, CodeLocationLabel(newCalleeFunction));
111 void relinkCallerToFunction(ReturnAddressPtr returnAddress, FunctionPtr function)
113 relink(CodeLocationCall(CodePtr(returnAddress)), function);
116 void relinkNearCallerToTrampoline(ReturnAddressPtr returnAddress, CodeLocationLabel label)
118 relink(CodeLocationNearCall(CodePtr(returnAddress)), label);
121 void relinkNearCallerToTrampoline(ReturnAddressPtr returnAddress, CodePtr newCalleeFunction)
123 relinkNearCallerToTrampoline(returnAddress, CodeLocationLabel(newCalleeFunction));
126 void replaceWithLoad(CodeLocationConvertibleLoad label)
128 MacroAssembler::replaceWithLoad(label);
131 void replaceWithAddressComputation(CodeLocationConvertibleLoad label)
133 MacroAssembler::replaceWithAddressComputation(label);
136 void setLoadInstructionIsActive(CodeLocationConvertibleLoad label, bool isActive)
139 replaceWithLoad(label);
141 replaceWithAddressComputation(label);
151 #endif // ENABLE(ASSEMBLER)
153 #endif // RepatchBuffer_h