projects / apple / javascriptcore.git / blame
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|---|---|---|
| ed1e77d3 A |
1 | /* |
| 2 | * Copyright (C) 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 | #ifndef DFGPrePostNumbering_h | |
| 27 | #define DFGPrePostNumbering_h | |
| 28 | ||
| 29 | #if ENABLE(DFG_JIT) | |
| 30 | ||
| 31 | #include "DFGAnalysis.h" | |
| 32 | #include "DFGBasicBlock.h" | |
| 33 | #include "DFGBlockMap.h" | |
| 34 | ||
| 35 | namespace JSC { namespace DFG { | |
| 36 | ||
| 37 | enum EdgeKind { | |
| 38 | ForwardEdge, | |
| 39 | CrossEdge, | |
| 40 | BackEdge | |
| 41 | }; | |
| 42 | ||
| 43 | class PrePostNumbering : public Analysis<PrePostNumbering> { | |
| 44 | public: | |
| 45 | PrePostNumbering(); | |
| 46 | ~PrePostNumbering(); | |
| 47 | ||
| 48 | void compute(Graph&); | |
| 49 | ||
| 50 | unsigned preNumber(BasicBlock* block) const { return m_map[block].m_preNumber; } | |
| 51 | unsigned postNumber(BasicBlock* block) const { return m_map[block].m_postNumber; } | |
| 52 | ||
| 53 | // Is from a strict ancestor of to? | |
| 54 | bool isStrictAncestorOf(BasicBlock* from, BasicBlock* to) const | |
| 55 | { | |
| 56 | return preNumber(from) < preNumber(to) | |
| 57 | && postNumber(from) > postNumber(to); | |
| 58 | } | |
| 59 | ||
| 60 | bool isAncestorOf(BasicBlock* from, BasicBlock* to) const | |
| 61 | { | |
| 62 | return from == to || isStrictAncestorOf(from, to); | |
| 63 | } | |
| 64 | ||
| 65 | bool isStrictDescendantOf(BasicBlock* from, BasicBlock* to) const | |
| 66 | { | |
| 67 | return isStrictAncestorOf(to, from); | |
| 68 | } | |
| 69 | ||
| 70 | bool isDescendantOf(BasicBlock* from, BasicBlock* to) const | |
| 71 | { | |
| 72 | return isAncestorOf(to, from); | |
| 73 | } | |
| 74 | ||
| 75 | // This will give a bogus answer if there is actually no such edge. If you want to determine | |
| 76 | // if there is any such edge, you have to do it yourself. | |
| 77 | EdgeKind edgeKind(BasicBlock* from, BasicBlock* to) const | |
| 78 | { | |
| 79 | if (isStrictDescendantOf(to, from)) | |
| 80 | return ForwardEdge; | |
| 81 | ||
| 82 | if (isAncestorOf(to, from)) | |
| 83 | return BackEdge; | |
| 84 | ||
| 85 | return CrossEdge; | |
| 86 | } | |
| 87 | ||
| 88 | private: | |
| 89 | struct Numbering { | |
| 90 | unsigned m_preNumber; | |
| 91 | unsigned m_postNumber; | |
| 92 | }; | |
| 93 | ||
| 94 | BlockMap<Numbering> m_map; | |
| 95 | }; | |
| 96 | ||
| 97 | } } // namespace JSC::DFG | |
| 98 | ||
| 99 | namespace WTF { | |
| 100 | ||
| 101 | void printInternal(PrintStream&, JSC::DFG::EdgeKind); | |
| 102 | ||
| 103 | } // namespace WTF | |
| 104 | ||
| 105 | #endif // ENABLE(DFG_JIT) | |
| 106 | ||
| 107 | #endif // DFGPrePostNumbering_h | |
| 108 |