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annotate include/llvm/Analysis/LoopPass.h @ 77:54457678186b

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children 60c9769439b8
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1 //===- LoopPass.h - LoopPass class ----------------------------------------===//
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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 LoopPass class. All loop optimization
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11 // and transformation passes are derived from LoopPass.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #ifndef LLVM_ANALYSIS_LOOPPASS_H
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16 #define LLVM_ANALYSIS_LOOPPASS_H
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17
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18 #include "llvm/Analysis/LoopInfo.h"
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19 #include "llvm/IR/LegacyPassManagers.h"
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20 #include "llvm/Pass.h"
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21 #include <deque>
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22
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23 namespace llvm {
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24
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25 class LPPassManager;
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26 class Function;
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27 class PMStack;
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28
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29 class LoopPass : public Pass {
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30 public:
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31 explicit LoopPass(char &pid) : Pass(PT_Loop, pid) {}
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32
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33 /// getPrinterPass - Get a pass to print the function corresponding
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34 /// to a Loop.
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35 Pass *createPrinterPass(raw_ostream &O,
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36 const std::string &Banner) const override;
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37
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38 // runOnLoop - This method should be implemented by the subclass to perform
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39 // whatever action is necessary for the specified Loop.
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40 virtual bool runOnLoop(Loop *L, LPPassManager &LPM) = 0;
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41
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42 using llvm::Pass::doInitialization;
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43 using llvm::Pass::doFinalization;
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44
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45 // Initialization and finalization hooks.
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46 virtual bool doInitialization(Loop *L, LPPassManager &LPM) {
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47 return false;
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48 }
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49
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50 // Finalization hook does not supply Loop because at this time
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51 // loop nest is completely different.
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52 virtual bool doFinalization() { return false; }
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53
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54 // Check if this pass is suitable for the current LPPassManager, if
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55 // available. This pass P is not suitable for a LPPassManager if P
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56 // is not preserving higher level analysis info used by other
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57 // LPPassManager passes. In such case, pop LPPassManager from the
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58 // stack. This will force assignPassManager() to create new
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59 // LPPassManger as expected.
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60 void preparePassManager(PMStack &PMS) override;
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61
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62 /// Assign pass manager to manage this pass
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63 void assignPassManager(PMStack &PMS, PassManagerType PMT) override;
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64
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65 /// Return what kind of Pass Manager can manage this pass.
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66 PassManagerType getPotentialPassManagerType() const override {
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67 return PMT_LoopPassManager;
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68 }
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69
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70 //===--------------------------------------------------------------------===//
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71 /// SimpleAnalysis - Provides simple interface to update analysis info
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72 /// maintained by various passes. Note, if required this interface can
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73 /// be extracted into a separate abstract class but it would require
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74 /// additional use of multiple inheritance in Pass class hierarchy, something
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75 /// we are trying to avoid.
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76
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77 /// Each loop pass can override these simple analysis hooks to update
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78 /// desired analysis information.
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79 /// cloneBasicBlockAnalysis - Clone analysis info associated with basic block.
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80 virtual void cloneBasicBlockAnalysis(BasicBlock *F, BasicBlock *T, Loop *L) {}
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81
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82 /// deleteAnalysisValue - Delete analysis info associated with value V.
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83 virtual void deleteAnalysisValue(Value *V, Loop *L) {}
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84
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85 protected:
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86 /// skipOptnoneFunction - Containing function has Attribute::OptimizeNone
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87 /// and most transformation passes should skip it.
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88 bool skipOptnoneFunction(const Loop *L) const;
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89 };
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90
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91 class LPPassManager : public FunctionPass, public PMDataManager {
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92 public:
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93 static char ID;
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94 explicit LPPassManager();
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95
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96 /// run - Execute all of the passes scheduled for execution. Keep track of
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97 /// whether any of the passes modifies the module, and if so, return true.
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98 bool runOnFunction(Function &F) override;
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99
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100 /// Pass Manager itself does not invalidate any analysis info.
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101 // LPPassManager needs LoopInfo.
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102 void getAnalysisUsage(AnalysisUsage &Info) const override;
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103
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104 const char *getPassName() const override {
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105 return "Loop Pass Manager";
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106 }
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107
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108 PMDataManager *getAsPMDataManager() override { return this; }
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109 Pass *getAsPass() override { return this; }
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110
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111 /// Print passes managed by this manager
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112 void dumpPassStructure(unsigned Offset) override;
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113
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114 LoopPass *getContainedPass(unsigned N) {
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115 assert(N < PassVector.size() && "Pass number out of range!");
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116 LoopPass *LP = static_cast<LoopPass *>(PassVector[N]);
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117 return LP;
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118 }
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119
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120 PassManagerType getPassManagerType() const override {
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121 return PMT_LoopPassManager;
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122 }
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123
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124 public:
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125 // Delete loop from the loop queue and loop nest (LoopInfo).
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126 void deleteLoopFromQueue(Loop *L);
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127
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128 // Insert loop into the loop queue and add it as a child of the
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129 // given parent.
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130 void insertLoop(Loop *L, Loop *ParentLoop);
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131
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132 // Insert a loop into the loop queue.
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133 void insertLoopIntoQueue(Loop *L);
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134
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135 // Reoptimize this loop. LPPassManager will re-insert this loop into the
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136 // queue. This allows LoopPass to change loop nest for the loop. This
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137 // utility may send LPPassManager into infinite loops so use caution.
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138 void redoLoop(Loop *L);
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139
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140 //===--------------------------------------------------------------------===//
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141 /// SimpleAnalysis - Provides simple interface to update analysis info
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142 /// maintained by various passes. Note, if required this interface can
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143 /// be extracted into a separate abstract class but it would require
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144 /// additional use of multiple inheritance in Pass class hierarchy, something
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145 /// we are trying to avoid.
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146
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147 /// cloneBasicBlockSimpleAnalysis - Invoke cloneBasicBlockAnalysis hook for
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148 /// all passes that implement simple analysis interface.
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149 void cloneBasicBlockSimpleAnalysis(BasicBlock *From, BasicBlock *To, Loop *L);
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150
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151 /// deleteSimpleAnalysisValue - Invoke deleteAnalysisValue hook for all passes
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152 /// that implement simple analysis interface.
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153 void deleteSimpleAnalysisValue(Value *V, Loop *L);
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154
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155 private:
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156 std::deque<Loop *> LQ;
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157 bool skipThisLoop;
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158 bool redoThisLoop;
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159 LoopInfo *LI;
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160 Loop *CurrentLoop;
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161 };
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162
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163 } // End llvm namespace
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164
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165 #endif