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annotate include/llvm/Analysis/IntervalPartition.h @ 120:1172e4bd9c6f

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date Fri, 25 Nov 2016 19:14:25 +0900
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1 //===- IntervalPartition.h - Interval partition Calculation -----*- 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 contains the declaration of the IntervalPartition class, which
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11 // calculates and represents the interval partition of a function, or a
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12 // preexisting interval partition.
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13 //
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14 // In this way, the interval partition may be used to reduce a flow graph down
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15 // to its degenerate single node interval partition (unless it is irreducible).
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16 //
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17 // TODO: The IntervalPartition class should take a bool parameter that tells
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18 // whether it should add the "tails" of an interval to an interval itself or if
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19 // they should be represented as distinct intervals.
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20 //
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21 //===----------------------------------------------------------------------===//
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22
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23 #ifndef LLVM_ANALYSIS_INTERVALPARTITION_H
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24 #define LLVM_ANALYSIS_INTERVALPARTITION_H
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25
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26 #include "llvm/Analysis/Interval.h"
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27 #include "llvm/Pass.h"
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28 #include <map>
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29
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30 namespace llvm {
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31
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32 //===----------------------------------------------------------------------===//
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33 //
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34 // IntervalPartition - This class builds and holds an "interval partition" for
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35 // a function. This partition divides the control flow graph into a set of
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36 // maximal intervals, as defined with the properties above. Intuitively, an
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37 // interval is a (possibly nonexistent) loop with a "tail" of non-looping
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38 // nodes following it.
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39 //
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40 class IntervalPartition : public FunctionPass {
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41 typedef std::map<BasicBlock*, Interval*> IntervalMapTy;
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42 IntervalMapTy IntervalMap;
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43
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44 typedef std::vector<Interval*> IntervalListTy;
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45 Interval *RootInterval;
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46 std::vector<Interval*> Intervals;
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47
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48 public:
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49 static char ID; // Pass identification, replacement for typeid
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50
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51 IntervalPartition() : FunctionPass(ID), RootInterval(nullptr) {
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52 initializeIntervalPartitionPass(*PassRegistry::getPassRegistry());
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53 }
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54
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55 // run - Calculate the interval partition for this function
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56 bool runOnFunction(Function &F) override;
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57
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58 // IntervalPartition ctor - Build a reduced interval partition from an
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59 // existing interval graph. This takes an additional boolean parameter to
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60 // distinguish it from a copy constructor. Always pass in false for now.
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61 //
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62 IntervalPartition(IntervalPartition &I, bool);
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63
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64 // print - Show contents in human readable format...
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65 void print(raw_ostream &O, const Module* = nullptr) const override;
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66
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67 // getRootInterval() - Return the root interval that contains the starting
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68 // block of the function.
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69 inline Interval *getRootInterval() { return RootInterval; }
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70
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71 // isDegeneratePartition() - Returns true if the interval partition contains
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72 // a single interval, and thus cannot be simplified anymore.
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73 bool isDegeneratePartition() { return Intervals.size() == 1; }
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74
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75 // TODO: isIrreducible - look for triangle graph.
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76
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77 // getBlockInterval - Return the interval that a basic block exists in.
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78 inline Interval *getBlockInterval(BasicBlock *BB) {
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79 IntervalMapTy::iterator I = IntervalMap.find(BB);
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80 return I != IntervalMap.end() ? I->second : nullptr;
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81 }
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82
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83 // getAnalysisUsage - Implement the Pass API
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84 void getAnalysisUsage(AnalysisUsage &AU) const override {
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85 AU.setPreservesAll();
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86 }
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87
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88 // Interface to Intervals vector...
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89 const std::vector<Interval*> &getIntervals() const { return Intervals; }
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90
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91 // releaseMemory - Reset state back to before function was analyzed
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92 void releaseMemory() override;
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93
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94 private:
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95 // addIntervalToPartition - Add an interval to the internal list of intervals,
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96 // and then add mappings from all of the basic blocks in the interval to the
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97 // interval itself (in the IntervalMap).
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98 //
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99 void addIntervalToPartition(Interval *I);
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100
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101 // updatePredecessors - Interval generation only sets the successor fields of
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102 // the interval data structures. After interval generation is complete,
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103 // run through all of the intervals and propagate successor info as
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104 // predecessor info.
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105 //
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106 void updatePredecessors(Interval *Int);
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107 };
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108
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109 } // End llvm namespace
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110
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111 #endif