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