/usr/include/llvm-3.9/llvm/Analysis/OrderedBasicBlock.h is in llvm-3.9-dev 1:3.9.1-19ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | //===- llvm/Analysis/OrderedBasicBlock.h --------------------- -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the OrderedBasicBlock class. OrderedBasicBlock maintains
// an interface where clients can query if one instruction comes before another
// in a BasicBlock. Since BasicBlock currently lacks a reliable way to query
// relative position between instructions one can use OrderedBasicBlock to do
// such queries. OrderedBasicBlock is lazily built on a source BasicBlock and
// maintains an internal Instruction -> Position map. A OrderedBasicBlock
// instance should be discarded whenever the source BasicBlock changes.
//
// It's currently used by the CaptureTracker in order to find relative
// positions of a pair of instructions inside a BasicBlock.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_ORDEREDBASICBLOCK_H
#define LLVM_ANALYSIS_ORDEREDBASICBLOCK_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/IR/BasicBlock.h"
namespace llvm {
class Instruction;
class BasicBlock;
class OrderedBasicBlock {
private:
/// \brief Map a instruction to its position in a BasicBlock.
SmallDenseMap<const Instruction *, unsigned, 32> NumberedInsts;
/// \brief Keep track of last instruction inserted into \p NumberedInsts.
/// It speeds up queries for uncached instructions by providing a start point
/// for new queries in OrderedBasicBlock::comesBefore.
BasicBlock::const_iterator LastInstFound;
/// \brief The position/number to tag the next instruction to be found.
unsigned NextInstPos;
/// \brief The source BasicBlock to map.
const BasicBlock *BB;
/// \brief Given no cached results, find if \p A comes before \p B in \p BB.
/// Cache and number out instruction while walking \p BB.
bool comesBefore(const Instruction *A, const Instruction *B);
public:
OrderedBasicBlock(const BasicBlock *BasicB);
/// \brief Find out whether \p A dominates \p B, meaning whether \p A
/// comes before \p B in \p BB. This is a simplification that considers
/// cached instruction positions and ignores other basic blocks, being
/// only relevant to compare relative instructions positions inside \p BB.
bool dominates(const Instruction *A, const Instruction *B);
};
} // End llvm namespace
#endif
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