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//===- ScalarEvolutionAliasAnalysis.h - SCEV-based AA -----------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
/// \file
/// This is the interface for a SCEV-based alias analysis.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_SCALAREVOLUTIONALIASANALYSIS_H
#define LLVM_ANALYSIS_SCALAREVOLUTIONALIASANALYSIS_H
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
namespace llvm {
/// A simple alias analysis implementation that uses ScalarEvolution to answer
/// queries.
class SCEVAAResult : public AAResultBase<SCEVAAResult> {
ScalarEvolution &SE;
public:
explicit SCEVAAResult(ScalarEvolution &SE) : SE(SE) {}
SCEVAAResult(SCEVAAResult &&Arg) : AAResultBase(std::move(Arg)), SE(Arg.SE) {}
AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB,
AAQueryInfo &AAQI);
bool invalidate(Function &F, const PreservedAnalyses &PA,
FunctionAnalysisManager::Invalidator &Inv);
private:
Value *GetBaseValue(const SCEV *S);
};
/// Analysis pass providing a never-invalidated alias analysis result.
class SCEVAA : public AnalysisInfoMixin<SCEVAA> {
friend AnalysisInfoMixin<SCEVAA>;
static AnalysisKey Key;
public:
typedef SCEVAAResult Result;
SCEVAAResult run(Function &F, FunctionAnalysisManager &AM);
};
/// Legacy wrapper pass to provide the SCEVAAResult object.
class SCEVAAWrapperPass : public FunctionPass {
std::unique_ptr<SCEVAAResult> Result;
public:
static char ID;
SCEVAAWrapperPass();
SCEVAAResult &getResult() { return *Result; }
const SCEVAAResult &getResult() const { return *Result; }
bool runOnFunction(Function &F) override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
};
/// Creates an instance of \c SCEVAAWrapperPass.
FunctionPass *createSCEVAAWrapperPass();
}
#endif
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