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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 | ||
35 | namespace 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 | // | |
43 | class RepatchBuffer { | |
44 | typedef MacroAssemblerCodePtr CodePtr; | |
45 | ||
46 | public: | |
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 | ||
126 | private: | |
127 | void* m_start; | |
128 | size_t m_size; | |
129 | }; | |
130 | ||
131 | } // namespace JSC | |
132 | ||
133 | #endif // ENABLE(ASSEMBLER) | |
134 | ||
135 | #endif // RepatchBuffer_h |