1/*
2 * Copyright (C) 2012 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 AbstractPC_h
27#define AbstractPC_h
28
29#include "MacroAssemblerCodeRef.h"
30
31namespace JSC {
32
33class VM;
34class ExecState;
35struct Instruction;
36
37class AbstractPC {
38public:
39 AbstractPC()
40 : m_pointer(0)
41 , m_mode(None)
42 {
43 }
44
45 AbstractPC(VM&, ExecState*);
46
47#if ENABLE(JIT)
48 AbstractPC(ReturnAddressPtr ptr)
49 : m_pointer(ptr.value())
50 , m_mode(JIT)
51 {
52 }
53
54 bool hasJITReturnAddress() const { return m_mode == JIT; }
55 ReturnAddressPtr jitReturnAddress() const
56 {
57 ASSERT(hasJITReturnAddress());
58 return ReturnAddressPtr(m_pointer);
59 }
60#endif
61
62 bool isSet() const { return m_mode != None; }
63 bool operator!() const { return !isSet(); }
64
65private:
66 void* m_pointer;
67
68 enum Mode { None, JIT, Interpreter };
69 Mode m_mode;
70};
71
72} // namespace JSC
73
74#endif // AbstractPC_h
75
76