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 #include <wtf/Platform.h>
  30
  31 #if ENABLE(DFG_JIT)
  32
  33 namespace JSC { namespace DFG {
  34
  35 enum BranchDirection {
  36     // This is not a branch and so there is no branch direction, or
  37     // the branch direction has yet to be set.
  38     InvalidBranchDirection,
  39
  40     // The branch takes the true case.
  41     TakeTrue,
  42
  43     // The branch takes the false case.
  44     TakeFalse,
  45
  46     // For all we know, the branch could go either direction, so we
  47     // have to assume the worst.
  48     TakeBoth
  49 };
  50
  51 static inline const char* branchDirectionToString(BranchDirection branchDirection)
  52 {
  53     switch (branchDirection) {
  54     case InvalidBranchDirection:
  55         return "Invalid";
  56     case TakeTrue:
  57         return "TakeTrue";
  58     case TakeFalse:
  59         return "TakeFalse";
  60     case TakeBoth:
  61         return "TakeBoth";
  62     }
  63 }
  64
  65 static 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
  76 static 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
  86 #endif // ENABLE(DFG_JIT)
  87
  88 #endif // DFGBranchDirection_h