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//===- TypeBasedAliasAnalysis.h - Type-Based Alias Analysis -----*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
/// \file
/// This is the interface for a metadata-based TBAA. See the source file for
/// details on the algorithm.
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Pass.h"
#include <memory>
namespace llvm {
class Function;
class MDNode;
class MemoryLocation;
/// A simple AA result that uses TBAA metadata to answer queries.
class TypeBasedAAResult : public AAResultBase<TypeBasedAAResult> {
friend AAResultBase<TypeBasedAAResult>;
/// Handle invalidation events from the new pass manager.
/// By definition, this result is stateless and so remains valid.
bool invalidate(Function &, const PreservedAnalyses &,
FunctionAnalysisManager::Invalidator &) {
return false;
AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB);
bool pointsToConstantMemory(const MemoryLocation &Loc, bool OrLocal);
FunctionModRefBehavior getModRefBehavior(const CallBase *Call);
FunctionModRefBehavior getModRefBehavior(const Function *F);
ModRefInfo getModRefInfo(const CallBase *Call, const MemoryLocation &Loc);
ModRefInfo getModRefInfo(const CallBase *Call1, const CallBase *Call2);
bool Aliases(const MDNode *A, const MDNode *B) const;
bool PathAliases(const MDNode *A, const MDNode *B) const;
/// Analysis pass providing a never-invalidated alias analysis result.
class TypeBasedAA : public AnalysisInfoMixin<TypeBasedAA> {
friend AnalysisInfoMixin<TypeBasedAA>;
static AnalysisKey Key;
using Result = TypeBasedAAResult;
TypeBasedAAResult run(Function &F, FunctionAnalysisManager &AM);
/// Legacy wrapper pass to provide the TypeBasedAAResult object.
class TypeBasedAAWrapperPass : public ImmutablePass {
std::unique_ptr<TypeBasedAAResult> Result;
static char ID;
TypeBasedAAResult &getResult() { return *Result; }
const TypeBasedAAResult &getResult() const { return *Result; }
bool doInitialization(Module &M) override;
bool doFinalization(Module &M) override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
// createTypeBasedAAWrapperPass - This pass implements metadata-based
// type-based alias analysis.
ImmutablePass *createTypeBasedAAWrapperPass();
} // end namespace llvm