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annotate lib/Analysis/AliasDebugger.cpp @ 53:f679cc5126db

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include setjmp.h automatically
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Sat, 18 Jan 2014 23:56:19 +0900
parents 95c75e76d11b
children 54457678186b
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1 //===- AliasDebugger.cpp - Simple Alias Analysis Use Checker --------------===//
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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 simple pass checks alias analysis users to ensure that if they
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11 // create a new value, they do not query AA without informing it of the value.
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12 // It acts as a shim over any other AA pass you want.
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13 //
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14 // Yes keeping track of every value in the program is expensive, but this is
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15 // a debugging pass.
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16 //
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17 //===----------------------------------------------------------------------===//
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18
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19 #include "llvm/Analysis/Passes.h"
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20 #include "llvm/Analysis/AliasAnalysis.h"
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21 #include "llvm/IR/Constants.h"
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22 #include "llvm/IR/DerivedTypes.h"
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23 #include "llvm/IR/Instructions.h"
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24 #include "llvm/IR/Module.h"
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25 #include "llvm/Pass.h"
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26 #include <set>
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27 using namespace llvm;
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28
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29 namespace {
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30
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31 class AliasDebugger : public ModulePass, public AliasAnalysis {
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32
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33 //What we do is simple. Keep track of every value the AA could
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34 //know about, and verify that queries are one of those.
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35 //A query to a value that didn't exist when the AA was created
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36 //means someone forgot to update the AA when creating new values
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37
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38 std::set<const Value*> Vals;
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39
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40 public:
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41 static char ID; // Class identification, replacement for typeinfo
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42 AliasDebugger() : ModulePass(ID) {
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43 initializeAliasDebuggerPass(*PassRegistry::getPassRegistry());
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44 }
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45
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46 bool runOnModule(Module &M) {
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47 InitializeAliasAnalysis(this); // set up super class
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48
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49 for(Module::global_iterator I = M.global_begin(),
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50 E = M.global_end(); I != E; ++I) {
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51 Vals.insert(&*I);
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52 for (User::const_op_iterator OI = I->op_begin(),
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53 OE = I->op_end(); OI != OE; ++OI)
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54 Vals.insert(*OI);
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55 }
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56
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57 for(Module::iterator I = M.begin(),
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58 E = M.end(); I != E; ++I){
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59 Vals.insert(&*I);
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60 if(!I->isDeclaration()) {
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61 for (Function::arg_iterator AI = I->arg_begin(), AE = I->arg_end();
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62 AI != AE; ++AI)
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63 Vals.insert(&*AI);
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64 for (Function::const_iterator FI = I->begin(), FE = I->end();
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65 FI != FE; ++FI)
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66 for (BasicBlock::const_iterator BI = FI->begin(), BE = FI->end();
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67 BI != BE; ++BI) {
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68 Vals.insert(&*BI);
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69 for (User::const_op_iterator OI = BI->op_begin(),
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70 OE = BI->op_end(); OI != OE; ++OI)
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71 Vals.insert(*OI);
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72 }
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73 }
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74
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75 }
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76 return false;
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77 }
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78
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79 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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80 AliasAnalysis::getAnalysisUsage(AU);
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81 AU.setPreservesAll(); // Does not transform code
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82 }
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83
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84 /// getAdjustedAnalysisPointer - This method is used when a pass implements
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85 /// an analysis interface through multiple inheritance. If needed, it
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86 /// should override this to adjust the this pointer as needed for the
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87 /// specified pass info.
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88 virtual void *getAdjustedAnalysisPointer(AnalysisID PI) {
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89 if (PI == &AliasAnalysis::ID)
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90 return (AliasAnalysis*)this;
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91 return this;
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92 }
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93
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94 //------------------------------------------------
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95 // Implement the AliasAnalysis API
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96 //
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97 AliasResult alias(const Location &LocA, const Location &LocB) {
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98 assert(Vals.find(LocA.Ptr) != Vals.end() &&
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99 "Never seen value in AA before");
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100 assert(Vals.find(LocB.Ptr) != Vals.end() &&
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101 "Never seen value in AA before");
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102 return AliasAnalysis::alias(LocA, LocB);
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103 }
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104
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105 ModRefResult getModRefInfo(ImmutableCallSite CS,
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106 const Location &Loc) {
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107 assert(Vals.find(Loc.Ptr) != Vals.end() && "Never seen value in AA before");
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108 return AliasAnalysis::getModRefInfo(CS, Loc);
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109 }
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110
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111 ModRefResult getModRefInfo(ImmutableCallSite CS1,
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112 ImmutableCallSite CS2) {
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113 return AliasAnalysis::getModRefInfo(CS1,CS2);
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114 }
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115
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116 bool pointsToConstantMemory(const Location &Loc, bool OrLocal) {
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117 assert(Vals.find(Loc.Ptr) != Vals.end() && "Never seen value in AA before");
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118 return AliasAnalysis::pointsToConstantMemory(Loc, OrLocal);
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119 }
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120
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121 virtual void deleteValue(Value *V) {
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122 assert(Vals.find(V) != Vals.end() && "Never seen value in AA before");
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123 AliasAnalysis::deleteValue(V);
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124 }
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125 virtual void copyValue(Value *From, Value *To) {
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126 Vals.insert(To);
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127 AliasAnalysis::copyValue(From, To);
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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
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133 char AliasDebugger::ID = 0;
95c75e76d11b LLVM 3.4
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134 INITIALIZE_AG_PASS(AliasDebugger, AliasAnalysis, "debug-aa",
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135 "AA use debugger", false, true, false)
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136
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137 Pass *llvm::createAliasDebugger() { return new AliasDebugger(); }
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138