annotate lib/Analysis/MemDepPrinter.cpp @ 120:1172e4bd9c6f

update 4.0.0
author mir3636
date Fri, 25 Nov 2016 19:14:25 +0900
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children 803732b1fca8
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1 //===- MemDepPrinter.cpp - Printer for MemoryDependenceAnalysis -----------===//
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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 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "llvm/Analysis/Passes.h"
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14 #include "llvm/ADT/SetVector.h"
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15 #include "llvm/Analysis/MemoryDependenceAnalysis.h"
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16 #include "llvm/IR/CallSite.h"
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17 #include "llvm/IR/InstIterator.h"
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18 #include "llvm/IR/LLVMContext.h"
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19 #include "llvm/Support/ErrorHandling.h"
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20 #include "llvm/Support/raw_ostream.h"
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21 using namespace llvm;
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22
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23 namespace {
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24 struct MemDepPrinter : public FunctionPass {
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25 const Function *F;
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26
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27 enum DepType {
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28 Clobber = 0,
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29 Def,
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30 NonFuncLocal,
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31 Unknown
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32 };
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33
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34 static const char *const DepTypeStr[];
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35
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36 typedef PointerIntPair<const Instruction *, 2, DepType> InstTypePair;
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37 typedef std::pair<InstTypePair, const BasicBlock *> Dep;
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38 typedef SmallSetVector<Dep, 4> DepSet;
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39 typedef DenseMap<const Instruction *, DepSet> DepSetMap;
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40 DepSetMap Deps;
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41
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42 static char ID; // Pass identifcation, replacement for typeid
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43 MemDepPrinter() : FunctionPass(ID) {
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44 initializeMemDepPrinterPass(*PassRegistry::getPassRegistry());
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45 }
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46
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47 bool runOnFunction(Function &F) override;
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48
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49 void print(raw_ostream &OS, const Module * = nullptr) const override;
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50
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51 void getAnalysisUsage(AnalysisUsage &AU) const override {
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52 AU.addRequiredTransitive<AAResultsWrapperPass>();
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53 AU.addRequiredTransitive<MemoryDependenceWrapperPass>();
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54 AU.setPreservesAll();
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55 }
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56
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57 void releaseMemory() override {
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58 Deps.clear();
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59 F = nullptr;
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60 }
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61
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62 private:
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63 static InstTypePair getInstTypePair(MemDepResult dep) {
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64 if (dep.isClobber())
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65 return InstTypePair(dep.getInst(), Clobber);
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66 if (dep.isDef())
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67 return InstTypePair(dep.getInst(), Def);
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68 if (dep.isNonFuncLocal())
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69 return InstTypePair(dep.getInst(), NonFuncLocal);
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70 assert(dep.isUnknown() && "unexpected dependence type");
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71 return InstTypePair(dep.getInst(), Unknown);
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72 }
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73 static InstTypePair getInstTypePair(const Instruction* inst, DepType type) {
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74 return InstTypePair(inst, type);
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75 }
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76 };
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77 }
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78
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79 char MemDepPrinter::ID = 0;
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80 INITIALIZE_PASS_BEGIN(MemDepPrinter, "print-memdeps",
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81 "Print MemDeps of function", false, true)
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82 INITIALIZE_PASS_DEPENDENCY(MemoryDependenceWrapperPass)
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83 INITIALIZE_PASS_END(MemDepPrinter, "print-memdeps",
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84 "Print MemDeps of function", false, true)
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85
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86 FunctionPass *llvm::createMemDepPrinter() {
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87 return new MemDepPrinter();
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88 }
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89
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90 const char *const MemDepPrinter::DepTypeStr[]
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91 = {"Clobber", "Def", "NonFuncLocal", "Unknown"};
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92
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93 bool MemDepPrinter::runOnFunction(Function &F) {
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94 this->F = &F;
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95 MemoryDependenceResults &MDA = getAnalysis<MemoryDependenceWrapperPass>().getMemDep();
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96
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97 // All this code uses non-const interfaces because MemDep is not
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98 // const-friendly, though nothing is actually modified.
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99 for (auto &I : instructions(F)) {
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100 Instruction *Inst = &I;
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101
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102 if (!Inst->mayReadFromMemory() && !Inst->mayWriteToMemory())
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103 continue;
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104
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105 MemDepResult Res = MDA.getDependency(Inst);
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106 if (!Res.isNonLocal()) {
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107 Deps[Inst].insert(std::make_pair(getInstTypePair(Res),
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108 static_cast<BasicBlock *>(nullptr)));
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109 } else if (auto CS = CallSite(Inst)) {
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110 const MemoryDependenceResults::NonLocalDepInfo &NLDI =
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111 MDA.getNonLocalCallDependency(CS);
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112
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113 DepSet &InstDeps = Deps[Inst];
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114 for (const NonLocalDepEntry &I : NLDI) {
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115 const MemDepResult &Res = I.getResult();
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116 InstDeps.insert(std::make_pair(getInstTypePair(Res), I.getBB()));
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117 }
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118 } else {
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119 SmallVector<NonLocalDepResult, 4> NLDI;
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120 assert( (isa<LoadInst>(Inst) || isa<StoreInst>(Inst) ||
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121 isa<VAArgInst>(Inst)) && "Unknown memory instruction!");
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122 MDA.getNonLocalPointerDependency(Inst, NLDI);
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123
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124 DepSet &InstDeps = Deps[Inst];
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125 for (const NonLocalDepResult &I : NLDI) {
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126 const MemDepResult &Res = I.getResult();
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127 InstDeps.insert(std::make_pair(getInstTypePair(Res), I.getBB()));
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128 }
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129 }
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130 }
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131
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132 return false;
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133 }
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134
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135 void MemDepPrinter::print(raw_ostream &OS, const Module *M) const {
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136 for (const auto &I : instructions(*F)) {
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137 const Instruction *Inst = &I;
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138
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139 DepSetMap::const_iterator DI = Deps.find(Inst);
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140 if (DI == Deps.end())
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141 continue;
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142
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143 const DepSet &InstDeps = DI->second;
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144
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145 for (const auto &I : InstDeps) {
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146 const Instruction *DepInst = I.first.getPointer();
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147 DepType type = I.first.getInt();
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148 const BasicBlock *DepBB = I.second;
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149
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150 OS << " ";
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151 OS << DepTypeStr[type];
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152 if (DepBB) {
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153 OS << " in block ";
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154 DepBB->printAsOperand(OS, /*PrintType=*/false, M);
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155 }
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156 if (DepInst) {
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157 OS << " from: ";
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158 DepInst->print(OS);
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159 }
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160 OS << "\n";
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161 }
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162
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163 Inst->print(OS);
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164 OS << "\n\n";
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165 }
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166 }