1 //===- TypeBasedAliasAnalysis.h - Type-Based Alias Analysis -----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 /// This is the interface for a metadata-based TBAA. See the source file for
11 /// details on the algorithm.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_ANALYSIS_TYPEBASEDALIASANALYSIS_H
16 #define LLVM_ANALYSIS_TYPEBASEDALIASANALYSIS_H
18 #include "llvm/Analysis/AliasAnalysis.h"
19 #include "llvm/IR/Function.h"
20 #include "llvm/IR/Metadata.h"
21 #include "llvm/Pass.h"
25 /// A simple AA result that uses TBAA metadata to answer queries.
26 class TypeBasedAAResult : public AAResultBase<TypeBasedAAResult> {
27 friend AAResultBase<TypeBasedAAResult>;
30 /// Handle invalidation events from the new pass manager.
32 /// By definition, this result is stateless and so remains valid.
33 bool invalidate(Function &, const PreservedAnalyses &,
34 FunctionAnalysisManager::Invalidator &) {
38 AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB);
39 bool pointsToConstantMemory(const MemoryLocation &Loc, bool OrLocal);
40 FunctionModRefBehavior getModRefBehavior(ImmutableCallSite CS);
41 FunctionModRefBehavior getModRefBehavior(const Function *F);
42 ModRefInfo getModRefInfo(ImmutableCallSite CS, const MemoryLocation &Loc);
43 ModRefInfo getModRefInfo(ImmutableCallSite CS1, ImmutableCallSite CS2);
46 bool Aliases(const MDNode *A, const MDNode *B) const;
47 bool PathAliases(const MDNode *A, const MDNode *B) const;
50 /// Analysis pass providing a never-invalidated alias analysis result.
51 class TypeBasedAA : public AnalysisInfoMixin<TypeBasedAA> {
52 friend AnalysisInfoMixin<TypeBasedAA>;
53 static AnalysisKey Key;
56 typedef TypeBasedAAResult Result;
58 TypeBasedAAResult run(Function &F, FunctionAnalysisManager &AM);
61 /// Legacy wrapper pass to provide the TypeBasedAAResult object.
62 class TypeBasedAAWrapperPass : public ImmutablePass {
63 std::unique_ptr<TypeBasedAAResult> Result;
68 TypeBasedAAWrapperPass();
70 TypeBasedAAResult &getResult() { return *Result; }
71 const TypeBasedAAResult &getResult() const { return *Result; }
73 bool doInitialization(Module &M) override;
74 bool doFinalization(Module &M) override;
75 void getAnalysisUsage(AnalysisUsage &AU) const override;
78 //===--------------------------------------------------------------------===//
80 // createTypeBasedAAWrapperPass - This pass implements metadata-based
81 // type-based alias analysis.
83 ImmutablePass *createTypeBasedAAWrapperPass();