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 DFGOSRExitJumpPlaceholder_h
27#define DFGOSRExitJumpPlaceholder_h
28
29#if ENABLE(DFG_JIT)
30
31#include "DFGCommon.h"
32#include "MacroAssembler.h"
33
34namespace JSC { namespace DFG {
35
36class JITCompiler;
37class SpeculativeJIT;
38
39class OSRExitJumpPlaceholder {
40public:
41    OSRExitJumpPlaceholder()
42        : m_index(std::numeric_limits<unsigned>::max())
43    {
44    }
45
46private:
47    friend class SpeculativeJIT;
48
49    OSRExitJumpPlaceholder(unsigned index)
50        : m_index(index)
51    {
52    }
53
54public:
55    bool operator!() const { return m_index == std::numeric_limits<unsigned>::max(); }
56
57    void fill(JITCompiler&, const MacroAssembler::JumpList&);
58    void fill(SpeculativeJIT*, const MacroAssembler::JumpList&);
59
60private:
61    unsigned m_index;
62};
63
64} } // namespace JSC::DFG
65
66#endif // ENABLE(DFG_JIT)
67
68#endif // DFGOSRExitJumpPlaceholder_h
69
70