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#pragma once
27
28namespace JSC { namespace DFG {
29
30enum DoubleFormatState {
31 EmptyDoubleFormatState, // bottom
32 UsingDoubleFormat,
33 NotUsingDoubleFormat,
34 CantUseDoubleFormat // top
35};
36
37inline DoubleFormatState mergeDoubleFormatStates(DoubleFormatState a, DoubleFormatState b)
38{
39 switch (a) {
40 case EmptyDoubleFormatState:
41 return b;
42 case UsingDoubleFormat:
43 switch (b) {
44 case EmptyDoubleFormatState:
45 case UsingDoubleFormat:
46 return UsingDoubleFormat;
47 case NotUsingDoubleFormat:
48 case CantUseDoubleFormat:
49 return CantUseDoubleFormat;
50 }
51 RELEASE_ASSERT_NOT_REACHED();
52 case NotUsingDoubleFormat:
53 switch (b) {
54 case EmptyDoubleFormatState:
55 case NotUsingDoubleFormat:
56 return NotUsingDoubleFormat;
57 case UsingDoubleFormat:
58 case CantUseDoubleFormat:
59 return CantUseDoubleFormat;
60 }
61 RELEASE_ASSERT_NOT_REACHED();
62 case CantUseDoubleFormat:
63 return CantUseDoubleFormat;
64 }
65 RELEASE_ASSERT_NOT_REACHED();
66 return CantUseDoubleFormat;
67}
68
69inline bool mergeDoubleFormatState(DoubleFormatState& dest, DoubleFormatState src)
70{
71 DoubleFormatState newState = mergeDoubleFormatStates(dest, src);
72 if (newState == dest)
73 return false;
74 dest = newState;
75 return true;
76}
77
78inline const char* doubleFormatStateToString(DoubleFormatState state)
79{
80 switch (state) {
81 case EmptyDoubleFormatState:
82 return "Empty";
83 case UsingDoubleFormat:
84 return "DoubleFormat";
85 case NotUsingDoubleFormat:
86 return "ValueFormat";
87 case CantUseDoubleFormat:
88 return "ForceValue";
89 }
90 RELEASE_ASSERT_NOT_REACHED();
91 return 0;
92}
93
94} } // namespace JSC::DFG
95