dfg/DFGBranchDirection.h

   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
  31 namespace JSC { namespace DFG {
  32
  33 enum 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
  49 static 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
  63 static 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
  74 static 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