1/*
2 * Copyright (C) 2011 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 DFGOSRExitCompiler_h
27#define DFGOSRExitCompiler_h
28
29#if ENABLE(DFG_JIT)
30
31#include "AssemblyHelpers.h"
32#include "CCallHelpers.h"
33#include "DFGOSRExit.h"
34#include "DFGOperations.h"
35
36namespace JSC {
37
38class ExecState;
39
40namespace DFG {
41
42class OSRExitCompiler {
43public:
44    OSRExitCompiler(CCallHelpers& jit)
45        : m_jit(jit)
46    {
47    }
48
49    void compileExit(const OSRExit&, const Operands<ValueRecovery>&, SpeculationRecovery*);
50
51private:
52#if !ASSERT_DISABLED
53    static unsigned badIndex() { return static_cast<unsigned>(-1); };
54#endif
55
56    void initializePoisoned(unsigned size)
57    {
58#if ASSERT_DISABLED
59        m_poisonScratchIndices.resize(size);
60#else
61        m_poisonScratchIndices.fill(badIndex(), size);
62#endif
63    }
64
65    unsigned poisonIndex(unsigned index)
66    {
67        unsigned result = m_poisonScratchIndices[index];
68        ASSERT(result != badIndex());
69        return result;
70    }
71
72    CCallHelpers& m_jit;
73    Vector<unsigned> m_poisonScratchIndices;
74};
75
76extern "C" {
77void JIT_OPERATION compileOSRExit(ExecState*) WTF_INTERNAL;
78}
79
80} } // namespace JSC::DFG
81
82#endif // ENABLE(DFG_JIT)
83
84#endif // DFGOSRExitCompiler_h
85