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annotate lib/Analysis/MemDepPrinter.cpp @ 77:54457678186b LLVM3.6

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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 e4204d083e25
children 60c9769439b8
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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<AliasAnalysis>();
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53 AU.addRequiredTransitive<MemoryDependenceAnalysis>();
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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(MemoryDependenceAnalysis)
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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 AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
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96 MemoryDependenceAnalysis &MDA = getAnalysis<MemoryDependenceAnalysis>();
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97
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98 // All this code uses non-const interfaces because MemDep is not
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99 // const-friendly, though nothing is actually modified.
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100 for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
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101 Instruction *Inst = &*I;
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102
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103 if (!Inst->mayReadFromMemory() && !Inst->mayWriteToMemory())
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104 continue;
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105
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106 MemDepResult Res = MDA.getDependency(Inst);
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107 if (!Res.isNonLocal()) {
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108 Deps[Inst].insert(std::make_pair(getInstTypePair(Res),
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109 static_cast<BasicBlock *>(nullptr)));
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110 } else if (CallSite CS = cast<Value>(Inst)) {
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111 const MemoryDependenceAnalysis::NonLocalDepInfo &NLDI =
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112 MDA.getNonLocalCallDependency(CS);
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113
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114 DepSet &InstDeps = Deps[Inst];
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115 for (MemoryDependenceAnalysis::NonLocalDepInfo::const_iterator
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116 I = NLDI.begin(), E = NLDI.end(); I != E; ++I) {
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117 const MemDepResult &Res = I->getResult();
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118 InstDeps.insert(std::make_pair(getInstTypePair(Res), I->getBB()));
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119 }
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120 } else {
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121 SmallVector<NonLocalDepResult, 4> NLDI;
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122 if (LoadInst *LI = dyn_cast<LoadInst>(Inst)) {
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123 if (!LI->isUnordered()) {
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124 // FIXME: Handle atomic/volatile loads.
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125 Deps[Inst].insert(std::make_pair(getInstTypePair(nullptr, Unknown),
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126 static_cast<BasicBlock *>(nullptr)));
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127 continue;
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128 }
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129 AliasAnalysis::Location Loc = AA.getLocation(LI);
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diff changeset
130 MDA.getNonLocalPointerDependency(Loc, true, LI->getParent(), NLDI);
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131 } else if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
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diff changeset
132 if (!SI->isUnordered()) {
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diff changeset
133 // FIXME: Handle atomic/volatile stores.
77
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diff changeset
134 Deps[Inst].insert(std::make_pair(getInstTypePair(nullptr, Unknown),
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parents: 33
diff changeset
135 static_cast<BasicBlock *>(nullptr)));
0
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
136 continue;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 }
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diff changeset
138 AliasAnalysis::Location Loc = AA.getLocation(SI);
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parents:
diff changeset
139 MDA.getNonLocalPointerDependency(Loc, false, SI->getParent(), NLDI);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140 } else if (VAArgInst *VI = dyn_cast<VAArgInst>(Inst)) {
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
141 AliasAnalysis::Location Loc = AA.getLocation(VI);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
142 MDA.getNonLocalPointerDependency(Loc, false, VI->getParent(), NLDI);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143 } else {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 llvm_unreachable("Unknown memory instruction!");
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 }
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parents:
diff changeset
146
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147 DepSet &InstDeps = Deps[Inst];
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148 for (SmallVectorImpl<NonLocalDepResult>::const_iterator
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
149 I = NLDI.begin(), E = NLDI.end(); I != E; ++I) {
95c75e76d11b LLVM 3.4
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parents:
diff changeset
150 const MemDepResult &Res = I->getResult();
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 InstDeps.insert(std::make_pair(getInstTypePair(Res), I->getBB()));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
153 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
154 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
155
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 return false;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
158
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
159 void MemDepPrinter::print(raw_ostream &OS, const Module *M) const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
160 for (const_inst_iterator I = inst_begin(*F), E = inst_end(*F); I != E; ++I) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
161 const Instruction *Inst = &*I;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
162
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
163 DepSetMap::const_iterator DI = Deps.find(Inst);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
164 if (DI == Deps.end())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
165 continue;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
166
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
167 const DepSet &InstDeps = DI->second;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
168
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
169 for (DepSet::const_iterator I = InstDeps.begin(), E = InstDeps.end();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
170 I != E; ++I) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
171 const Instruction *DepInst = I->first.getPointer();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
172 DepType type = I->first.getInt();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
173 const BasicBlock *DepBB = I->second;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
174
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 OS << " ";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
176 OS << DepTypeStr[type];
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 if (DepBB) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
178 OS << " in block ";
77
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parents: 33
diff changeset
179 DepBB->printAsOperand(OS, /*PrintType=*/false, M);
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
180 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
181 if (DepInst) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
182 OS << " from: ";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
183 DepInst->print(OS);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
185 OS << "\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
187
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
188 Inst->print(OS);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
189 OS << "\n\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
190 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
191 }