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
38namespace 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

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/jit/JITCode.h