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fix
author mir3636
date Wed, 06 Dec 2017 14:37:17 +0900
parents 803732b1fca8
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1 //===- llvm/Analysis/OrderedBasicBlock.h --------------------- -*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file defines the OrderedBasicBlock class. OrderedBasicBlock maintains
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11 // an interface where clients can query if one instruction comes before another
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12 // in a BasicBlock. Since BasicBlock currently lacks a reliable way to query
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13 // relative position between instructions one can use OrderedBasicBlock to do
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14 // such queries. OrderedBasicBlock is lazily built on a source BasicBlock and
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15 // maintains an internal Instruction -> Position map. A OrderedBasicBlock
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16 // instance should be discarded whenever the source BasicBlock changes.
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17 //
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18 // It's currently used by the CaptureTracker in order to find relative
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19 // positions of a pair of instructions inside a BasicBlock.
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20 //
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21 //===----------------------------------------------------------------------===//
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22
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23 #ifndef LLVM_ANALYSIS_ORDEREDBASICBLOCK_H
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24 #define LLVM_ANALYSIS_ORDEREDBASICBLOCK_H
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25
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26 #include "llvm/ADT/DenseMap.h"
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27 #include "llvm/IR/BasicBlock.h"
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28
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29 namespace llvm {
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30
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31 class Instruction;
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32 class BasicBlock;
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33
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34 class OrderedBasicBlock {
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35 private:
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36 /// \brief Map a instruction to its position in a BasicBlock.
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37 SmallDenseMap<const Instruction *, unsigned, 32> NumberedInsts;
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38
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39 /// \brief Keep track of last instruction inserted into \p NumberedInsts.
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40 /// It speeds up queries for uncached instructions by providing a start point
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41 /// for new queries in OrderedBasicBlock::comesBefore.
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42 BasicBlock::const_iterator LastInstFound;
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43
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44 /// \brief The position/number to tag the next instruction to be found.
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45 unsigned NextInstPos;
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46
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47 /// \brief The source BasicBlock to map.
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48 const BasicBlock *BB;
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49
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50 /// \brief Given no cached results, find if \p A comes before \p B in \p BB.
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51 /// Cache and number out instruction while walking \p BB.
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52 bool comesBefore(const Instruction *A, const Instruction *B);
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53
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54 public:
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55 OrderedBasicBlock(const BasicBlock *BasicB);
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56
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57 /// \brief Find out whether \p A dominates \p B, meaning whether \p A
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58 /// comes before \p B in \p BB. This is a simplification that considers
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59 /// cached instruction positions and ignores other basic blocks, being
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60 /// only relevant to compare relative instructions positions inside \p BB.
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61 /// Returns false for A == B.
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62 bool dominates(const Instruction *A, const Instruction *B);
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63 };
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64
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65 } // End llvm namespace
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66
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67 #endif