1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/*
* 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 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
|
