mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-24 13:33:37 +02:00
6150530377
This was originally a pointer to support pass managers which didn't use AnalysisManagers. However, that doesn't realistically come up much and the complexity of supporting it doesn't really make sense. In fact, *many* parts of the pass manager were just assuming the pointer was never null already. This at least makes it much more explicit and clear. llvm-svn: 263219
73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
//===- ScalarEvolutionAliasAnalysis.h - SCEV-based AA -----------*- 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 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) : AAResultBase(), SE(SE) {}
|
|
SCEVAAResult(SCEVAAResult &&Arg) : AAResultBase(std::move(Arg)), SE(Arg.SE) {}
|
|
|
|
AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB);
|
|
|
|
private:
|
|
Value *GetBaseValue(const SCEV *S);
|
|
};
|
|
|
|
/// Analysis pass providing a never-invalidated alias analysis result.
|
|
class SCEVAA : public AnalysisInfoMixin<SCEVAA> {
|
|
friend AnalysisInfoMixin<SCEVAA>;
|
|
static char PassID;
|
|
|
|
public:
|
|
typedef SCEVAAResult Result;
|
|
|
|
SCEVAAResult run(Function &F, AnalysisManager<Function> &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
|