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1/*
2 * Copyright (C) 2009 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 RepatchBuffer_h
27#define RepatchBuffer_h
28
29#if ENABLE(JIT)
30
31#include "CodeBlock.h"
32#include <MacroAssembler.h>
33#include <wtf/Noncopyable.h>
34
35namespace JSC {
36
37// RepatchBuffer:
38//
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.
42//
43class RepatchBuffer {
44 typedef MacroAssemblerCodePtr CodePtr;
45
46public:
47 RepatchBuffer(CodeBlock* codeBlock)
48 {
49 JITCode& code = codeBlock->getJITCode();
50 m_start = code.start();
51 m_size = code.size();
52
53 ExecutableAllocator::makeWritable(m_start, m_size);
54 }
55
56 ~RepatchBuffer()
57 {
58 ExecutableAllocator::makeExecutable(m_start, m_size);
59 }
60
61 void relink(CodeLocationJump jump, CodeLocationLabel destination)
62 {
63 MacroAssembler::repatchJump(jump, destination);
64 }
65
66 void relink(CodeLocationCall call, CodeLocationLabel destination)
67 {
68 MacroAssembler::repatchCall(call, destination);
69 }
70
71 void relink(CodeLocationCall call, FunctionPtr destination)
72 {
73 MacroAssembler::repatchCall(call, destination);
74 }
75
76 void relink(CodeLocationNearCall nearCall, CodePtr destination)
77 {
78 MacroAssembler::repatchNearCall(nearCall, CodeLocationLabel(destination));
79 }
80
81 void relink(CodeLocationNearCall nearCall, CodeLocationLabel destination)
82 {
83 MacroAssembler::repatchNearCall(nearCall, destination);
84 }
85
86 void repatch(CodeLocationDataLabel32 dataLabel32, int32_t value)
87 {
88 MacroAssembler::repatchInt32(dataLabel32, value);
89 }
90
91 void repatch(CodeLocationDataLabelCompact dataLabelCompact, int32_t value)
92 {
93 MacroAssembler::repatchCompact(dataLabelCompact, value);
94 }
95
96 void repatch(CodeLocationDataLabelPtr dataLabelPtr, void* value)
97 {
98 MacroAssembler::repatchPointer(dataLabelPtr, value);
99 }
100
101 void relinkCallerToTrampoline(ReturnAddressPtr returnAddress, CodeLocationLabel label)
102 {
103 relink(CodeLocationCall(CodePtr(returnAddress)), label);
104 }
105
106 void relinkCallerToTrampoline(ReturnAddressPtr returnAddress, CodePtr newCalleeFunction)
107 {
108 relinkCallerToTrampoline(returnAddress, CodeLocationLabel(newCalleeFunction));
109 }
110
111 void relinkCallerToFunction(ReturnAddressPtr returnAddress, FunctionPtr function)
112 {
113 relink(CodeLocationCall(CodePtr(returnAddress)), function);
114 }
115
116 void relinkNearCallerToTrampoline(ReturnAddressPtr returnAddress, CodeLocationLabel label)
117 {
118 relink(CodeLocationNearCall(CodePtr(returnAddress)), label);
119 }
120
121 void relinkNearCallerToTrampoline(ReturnAddressPtr returnAddress, CodePtr newCalleeFunction)
122 {
123 relinkNearCallerToTrampoline(returnAddress, CodeLocationLabel(newCalleeFunction));
124 }
125
126private:
127 void* m_start;
128 size_t m_size;
129};
130
131} // namespace JSC
132
133#endif // ENABLE(ASSEMBLER)
134
135#endif // RepatchBuffer_h