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