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//===- TypeBasedAliasAnalysis.h - Type-Based Alias Analysis -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \file
/// This is the interface for a metadata-based TBAA. See the source file for
/// details on the algorithm.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_TYPEBASEDALIASANALYSIS_H
#define LLVM_ANALYSIS_TYPEBASEDALIASANALYSIS_H
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Metadata.h"
#include "llvm/Pass.h"
namespace llvm {
/// A simple AA result that uses TBAA metadata to answer queries.
class TypeBasedAAResult : public AAResultBase<TypeBasedAAResult> {
friend AAResultBase<TypeBasedAAResult>;
public:
explicit TypeBasedAAResult() {}
TypeBasedAAResult(TypeBasedAAResult &&Arg) : AAResultBase(std::move(Arg)) {}
/// Handle invalidation events from the new pass manager.
///
/// By definition, this result is stateless and so remains valid.
bool invalidate(Function &, const PreservedAnalyses &) { return false; }
AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB);
bool pointsToConstantMemory(const MemoryLocation &Loc, bool OrLocal);
FunctionModRefBehavior getModRefBehavior(ImmutableCallSite CS);
FunctionModRefBehavior getModRefBehavior(const Function *F);
ModRefInfo getModRefInfo(ImmutableCallSite CS, const MemoryLocation &Loc);
ModRefInfo getModRefInfo(ImmutableCallSite CS1, ImmutableCallSite CS2);
private:
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 char PassID;
public:
typedef TypeBasedAAResult Result;
TypeBasedAAResult run(Function &F, AnalysisManager<Function> &AM);
};
/// Legacy wrapper pass to provide the TypeBasedAAResult object.
class TypeBasedAAWrapperPass : public ImmutablePass {
std::unique_ptr<TypeBasedAAResult> Result;
public:
static char ID;
TypeBasedAAWrapperPass();
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();
}
#endif
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