1/*
2 * Copyright (C) 2013 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 DFGFlushedAt_h
27#define DFGFlushedAt_h
28
29#if ENABLE(DFG_JIT)
30
31#include "DFGFlushFormat.h"
32#include "VirtualRegister.h"
33
34namespace JSC { namespace DFG {
35
36class FlushedAt {
37public:
38    FlushedAt()
39        : m_format(DeadFlush)
40    {
41    }
42
43    explicit FlushedAt(FlushFormat format)
44        : m_format(format)
45    {
46        ASSERT(format == DeadFlush || format == ConflictingFlush);
47    }
48
49    FlushedAt(FlushFormat format, VirtualRegister virtualRegister)
50        : m_format(format)
51        , m_virtualRegister(virtualRegister)
52    {
53        if (format == DeadFlush)
54            ASSERT(!virtualRegister.isValid());
55        else
56            ASSERT(virtualRegister.isValid());
57    }
58
59    bool operator!() const { return m_format == DeadFlush; }
60
61    FlushFormat format() const { return m_format; }
62    VirtualRegister virtualRegister() const { return m_virtualRegister; }
63
64    bool operator==(const FlushedAt& other) const
65    {
66        return m_format == other.m_format
67            && m_virtualRegister == other.m_virtualRegister;
68    }
69
70    bool operator!=(const FlushedAt& other) const { return !(*this == other); }
71
72    FlushedAt merge(const FlushedAt& other) const
73    {
74        if (!*this)
75            return other;
76        if (!other)
77            return *this;
78        if (*this == other)
79            return *this;
80        return FlushedAt(ConflictingFlush);
81    }
82
83    void dump(PrintStream&) const;
84    void dumpInContext(PrintStream&, DumpContext*) const;
85
86private:
87    FlushFormat m_format;
88    VirtualRegister m_virtualRegister;
89};
90
91} } // namespace JSC::DFG
92
93#endif // ENABLE(DFG_JIT)
94
95#endif // DFGFlushedAt_h
96
97