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llvm-mirror/include/llvm/Analysis/ScopedNoAliasAA.h
Alina Sbirlea 3fc1696aca [AliasAnalysis] Second prototype to cache BasicAA / anyAA state.
Summary:
Adding contained caching to AliasAnalysis. BasicAA is currently the only one using it.

AA changes:
- This patch is pulling the caches from BasicAAResults to AAResults, meaning the getModRefInfo call benefits from the IsCapturedCache as well when in "batch mode".
- All AAResultBase implementations add the QueryInfo member to all APIs. AAResults APIs maintain wrapper APIs such that all alias()/getModRefInfo call sites are unchanged.
- AA now provides a BatchAAResults type as a wrapper to AAResults. It keeps the AAResults instance and a QueryInfo instantiated to batch mode. It delegates all work to the AAResults instance with the batched QueryInfo. More API wrappers may be needed in BatchAAResults; only the minimum needed is currently added.

MemorySSA changes:
- All walkers are now templated on the AA used (AliasAnalysis=AAResults or BatchAAResults).
- At build time, we optimize uses; now we create a local walker (lives only as long as OptimizeUses does) using BatchAAResults.
- All Walkers have an internal AA and only use that now, never the AA in MemorySSA. The Walkers receive the AA they will use when built.

- The walker we use for queries after the build is instantiated on AliasAnalysis and is built after building MemorySSA and setting AA.
- All static methods doing walking are now templated on AliasAnalysisType if they are used both during build and after. If used only during build, the method now only takes a BatchAAResults. If used only after build, the method now takes an AliasAnalysis.

Subscribers: sanjoy, arsenm, jvesely, nhaehnle, jlebar, george.burgess.iv, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59315

llvm-svn: 356783
2019-03-22 17:22:19 +00:00

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2.9 KiB
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//===- ScopedNoAliasAA.h - Scoped No-Alias Alias Analysis -------*- 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 metadata-based scoped no-alias analysis.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_SCOPEDNOALIASAA_H
#define LLVM_ANALYSIS_SCOPEDNOALIASAA_H
#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 which uses scoped-noalias metadata to answer queries.
class ScopedNoAliasAAResult : public AAResultBase<ScopedNoAliasAAResult> {
friend AAResultBase<ScopedNoAliasAAResult>;
public:
/// 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,
AAQueryInfo &AAQI);
ModRefInfo getModRefInfo(const CallBase *Call, const MemoryLocation &Loc,
AAQueryInfo &AAQI);
ModRefInfo getModRefInfo(const CallBase *Call1, const CallBase *Call2,
AAQueryInfo &AAQI);
private:
bool mayAliasInScopes(const MDNode *Scopes, const MDNode *NoAlias) const;
};
/// Analysis pass providing a never-invalidated alias analysis result.
class ScopedNoAliasAA : public AnalysisInfoMixin<ScopedNoAliasAA> {
friend AnalysisInfoMixin<ScopedNoAliasAA>;
static AnalysisKey Key;
public:
using Result = ScopedNoAliasAAResult;
ScopedNoAliasAAResult run(Function &F, FunctionAnalysisManager &AM);
};
/// Legacy wrapper pass to provide the ScopedNoAliasAAResult object.
class ScopedNoAliasAAWrapperPass : public ImmutablePass {
std::unique_ptr<ScopedNoAliasAAResult> Result;
public:
static char ID;
ScopedNoAliasAAWrapperPass();
ScopedNoAliasAAResult &getResult() { return *Result; }
const ScopedNoAliasAAResult &getResult() const { return *Result; }
bool doInitialization(Module &M) override;
bool doFinalization(Module &M) override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
};
//===--------------------------------------------------------------------===//
//
// createScopedNoAliasAAWrapperPass - This pass implements metadata-based
// scoped noalias analysis.
//
ImmutablePass *createScopedNoAliasAAWrapperPass();
} // end namespace llvm
#endif // LLVM_ANALYSIS_SCOPEDNOALIASAA_H