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#ifndef DFGBranchDirection_h
27#define DFGBranchDirection_h
28
29#if ENABLE(DFG_JIT)
30
31namespace JSC { namespace DFG {
32
33enum BranchDirection {
34    // This is not a branch and so there is no branch direction, or
35    // the branch direction has yet to be set.
36    InvalidBranchDirection,
37
38    // The branch takes the true case.
39    TakeTrue,
40
41    // The branch takes the false case.
42    TakeFalse,
43
44    // For all we know, the branch could go either direction, so we
45    // have to assume the worst.
46    TakeBoth
47};
48
49static inline const char* branchDirectionToString(BranchDirection branchDirection)
50{
51    switch (branchDirection) {
52    case InvalidBranchDirection:
53        return "Invalid";
54    case TakeTrue:
55        return "TakeTrue";
56    case TakeFalse:
57        return "TakeFalse";
58    case TakeBoth:
59        return "TakeBoth";
60    }
61}
62
63static inline bool isKnownDirection(BranchDirection branchDirection)
64{
65    switch (branchDirection) {
66    case TakeTrue:
67    case TakeFalse:
68        return true;
69    default:
70        return false;
71    }
72}
73
74static inline bool branchCondition(BranchDirection branchDirection)
75{
76    if (branchDirection == TakeTrue)
77        return true;
78    ASSERT(branchDirection == TakeFalse);
79    return false;
80}
81
82} } // namespace JSC::DFG
83
84#endif // ENABLE(DFG_JIT)
85
86#endif // DFGBranchDirection_h
87