1/*
2 * Copyright (C) 2012, 2014 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
30namespace JSC { namespace DFG {
31
32enum BranchDirection : uint8_t {
33 // This is not a branch and so there is no branch direction, or
34 // the branch direction has yet to be set.
35 InvalidBranchDirection,
36
37 // The branch takes the true case.
38 TakeTrue,
39
40 // The branch takes the false case.
41 TakeFalse,
42
43 // For all we know, the branch could go either direction, so we
44 // have to assume the worst.
45 TakeBoth
46};
47
48static inline const char* branchDirectionToString(BranchDirection branchDirection)
49{
50 switch (branchDirection) {
51 case InvalidBranchDirection:
52 return "InvalidBranchDirection";
53 case TakeTrue:
54 return "TakeTrue";
55 case TakeFalse:
56 return "TakeFalse";
57 case TakeBoth:
58 return "TakeBoth";
59 }
60
61 RELEASE_ASSERT_NOT_REACHED();
62 return "InvalidBranchDirection";
63}
64
65static inline bool isKnownDirection(BranchDirection branchDirection)
66{
67 switch (branchDirection) {
68 case TakeTrue:
69 case TakeFalse:
70 return true;
71 default:
72 return false;
73 }
74}
75
76static inline bool branchCondition(BranchDirection branchDirection)
77{
78 if (branchDirection == TakeTrue)
79 return true;
80 ASSERT(branchDirection == TakeFalse);
81 return false;
82}
83
84} } // namespace JSC::DFG
85
86namespace WTF {
87
88inline void printInternal(PrintStream& out, JSC::DFG::BranchDirection direction)
89{
90 out.print(JSC::DFG::branchDirectionToString(direction));
91}
92
93} // namespace WTF
94
95#endif // ENABLE(DFG_JIT)
96