1 //===- ScalarEvolutionAliasAnalysis.h - SCEV-based AA -----------*- 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 SCEV-based alias analysis.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_ANALYSIS_SCALAREVOLUTIONALIASANALYSIS_H
15 #define LLVM_ANALYSIS_SCALAREVOLUTIONALIASANALYSIS_H
17 #include "llvm/Analysis/AliasAnalysis.h"
18 #include "llvm/Analysis/ScalarEvolutionExpressions.h"
19 #include "llvm/IR/Function.h"
20 #include "llvm/IR/Metadata.h"
21 #include "llvm/IR/Module.h"
22 #include "llvm/Pass.h"
26 /// A simple alias analysis implementation that uses ScalarEvolution to answer
28 class ScalarEvolutionAliasAnalysis : public FunctionPass, public AliasAnalysis {
32 static char ID; // Class identification, replacement for typeinfo
33 ScalarEvolutionAliasAnalysis() : FunctionPass(ID), SE(nullptr) {
34 initializeScalarEvolutionAliasAnalysisPass(
35 *PassRegistry::getPassRegistry());
38 /// This method is used when a pass implements an analysis interface through
39 /// multiple inheritance.
41 /// If needed, it should override this to adjust the this pointer as needed
42 /// for the specified pass info.
43 void *getAdjustedAnalysisPointer(AnalysisID PI) override {
44 if (PI == &AliasAnalysis::ID)
45 return (AliasAnalysis *)this;
50 void getAnalysisUsage(AnalysisUsage &AU) const override;
51 bool runOnFunction(Function &F) override;
52 AliasResult alias(const MemoryLocation &LocA,
53 const MemoryLocation &LocB) override;
55 Value *GetBaseValue(const SCEV *S);
58 /// Creates an instance of \c ScalarEvolutionAliasAnalysis.
59 FunctionPass *createScalarEvolutionAliasAnalysisPass();