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annotate lib/Analysis/NoAliasAnalysis.cpp @ 0:95c75e76d11b

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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1 //===- NoAliasAnalysis.cpp - Minimal Alias Analysis Impl ------------------===//
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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 the default implementation of the Alias Analysis interface
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11 // that simply returns "I don't know" for all queries.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/Analysis/Passes.h"
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16 #include "llvm/Analysis/AliasAnalysis.h"
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17 #include "llvm/IR/DataLayout.h"
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18 #include "llvm/Pass.h"
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19 using namespace llvm;
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20
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21 namespace {
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22 /// NoAA - This class implements the -no-aa pass, which always returns "I
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23 /// don't know" for alias queries. NoAA is unlike other alias analysis
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24 /// implementations, in that it does not chain to a previous analysis. As
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25 /// such it doesn't follow many of the rules that other alias analyses must.
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26 ///
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27 struct NoAA : public ImmutablePass, public AliasAnalysis {
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28 static char ID; // Class identification, replacement for typeinfo
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29 NoAA() : ImmutablePass(ID) {
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30 initializeNoAAPass(*PassRegistry::getPassRegistry());
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31 }
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32
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33 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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34 }
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35
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36 virtual void initializePass() {
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37 // Note: NoAA does not call InitializeAliasAnalysis because it's
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38 // special and does not support chaining.
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39 TD = getAnalysisIfAvailable<DataLayout>();
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40 }
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41
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42 virtual AliasResult alias(const Location &LocA, const Location &LocB) {
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43 return MayAlias;
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44 }
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45
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46 virtual ModRefBehavior getModRefBehavior(ImmutableCallSite CS) {
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47 return UnknownModRefBehavior;
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48 }
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49 virtual ModRefBehavior getModRefBehavior(const Function *F) {
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50 return UnknownModRefBehavior;
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51 }
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52
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53 virtual bool pointsToConstantMemory(const Location &Loc,
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54 bool OrLocal) {
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55 return false;
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56 }
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57 virtual ModRefResult getModRefInfo(ImmutableCallSite CS,
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58 const Location &Loc) {
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59 return ModRef;
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60 }
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61 virtual ModRefResult getModRefInfo(ImmutableCallSite CS1,
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62 ImmutableCallSite CS2) {
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63 return ModRef;
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64 }
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65
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66 virtual void deleteValue(Value *V) {}
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67 virtual void copyValue(Value *From, Value *To) {}
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68 virtual void addEscapingUse(Use &U) {}
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69
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70 /// getAdjustedAnalysisPointer - This method is used when a pass implements
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71 /// an analysis interface through multiple inheritance. If needed, it
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72 /// should override this to adjust the this pointer as needed for the
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73 /// specified pass info.
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74 virtual void *getAdjustedAnalysisPointer(const void *ID) {
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75 if (ID == &AliasAnalysis::ID)
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76 return (AliasAnalysis*)this;
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77 return this;
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78 }
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79 };
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80 } // End of anonymous namespace
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81
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82 // Register this pass...
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83 char NoAA::ID = 0;
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84 INITIALIZE_AG_PASS(NoAA, AliasAnalysis, "no-aa",
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85 "No Alias Analysis (always returns 'may' alias)",
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86 true, true, true)
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87
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88 ImmutablePass *llvm::createNoAAPass() { return new NoAA(); }