1 | /* |
2 | * Copyright (C) 2008 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 JITCode_h |
27 | #define JITCode_h |
28 | |
29 | #include <wtf/Platform.h> |
30 | |
31 | #if ENABLE(JIT) |
32 | |
33 | #include "CallFrame.h" |
34 | #include "JSValue.h" |
35 | #include "MacroAssemblerCodeRef.h" |
36 | #include "Profiler.h" |
37 | |
38 | namespace JSC { |
39 | |
40 | class JSGlobalData; |
41 | class RegisterFile; |
42 | |
43 | class JITCode { |
44 | typedef MacroAssemblerCodeRef CodeRef; |
45 | typedef MacroAssemblerCodePtr CodePtr; |
46 | public: |
47 | JITCode() |
48 | { |
49 | } |
50 | |
51 | JITCode(const CodeRef ref) |
52 | : m_ref(ref) |
53 | { |
54 | } |
55 | |
56 | bool operator !() const |
57 | { |
58 | return !m_ref.m_code.executableAddress(); |
59 | } |
60 | |
61 | CodePtr addressForCall() |
62 | { |
63 | return m_ref.m_code; |
64 | } |
65 | |
66 | // This function returns the offset in bytes of 'pointerIntoCode' into |
67 | // this block of code. The pointer provided must be a pointer into this |
68 | // block of code. It is ASSERTed that no codeblock >4gb in size. |
69 | unsigned offsetOf(void* pointerIntoCode) |
70 | { |
71 | intptr_t result = reinterpret_cast<intptr_t>(pointerIntoCode) - reinterpret_cast<intptr_t>(m_ref.m_code.executableAddress()); |
72 | ASSERT(static_cast<intptr_t>(static_cast<unsigned>(result)) == result); |
73 | return static_cast<unsigned>(result); |
74 | } |
75 | |
76 | // Execute the code! |
77 | inline JSValue execute(RegisterFile* registerFile, CallFrame* callFrame, JSGlobalData* globalData, JSValue* exception) |
78 | { |
79 | return JSValue::decode(ptr: ctiTrampoline(code: m_ref.m_code.executableAddress(), registerFile, callFrame, exception, Profiler::enabledProfilerReference(), globalData)); |
80 | } |
81 | |
82 | void* start() |
83 | { |
84 | return m_ref.m_code.dataLocation(); |
85 | } |
86 | |
87 | size_t size() |
88 | { |
89 | ASSERT(m_ref.m_code.executableAddress()); |
90 | return m_ref.m_size; |
91 | } |
92 | |
93 | ExecutablePool* getExecutablePool() |
94 | { |
95 | return m_ref.m_executablePool.get(); |
96 | } |
97 | |
98 | // Host functions are a bit special; they have a m_code pointer but they |
99 | // do not individully ref the executable pool containing the trampoline. |
100 | static JITCode HostFunction(CodePtr code) |
101 | { |
102 | return JITCode(code.dataLocation(), 0, 0); |
103 | } |
104 | |
105 | private: |
106 | JITCode(void* code, PassRefPtr<ExecutablePool> executablePool, size_t size) |
107 | : m_ref(code, executablePool, size) |
108 | { |
109 | } |
110 | |
111 | CodeRef m_ref; |
112 | }; |
113 | |
114 | }; |
115 | |
116 | #endif |
117 | |
118 | #endif |
119 | |