6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
80 lines
2.8 KiB
C++
80 lines
2.8 KiB
C++
//===- ObjCARCAliasAnalysis.h - ObjC ARC 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 file declares a simple ARC-aware AliasAnalysis using special knowledge
|
|
/// of Objective C to enhance other optimization passes which rely on the Alias
|
|
/// Analysis infrastructure.
|
|
///
|
|
/// WARNING: This file knows about certain library functions. It recognizes them
|
|
/// by name, and hardwires knowledge of their semantics.
|
|
///
|
|
/// WARNING: This file knows about how certain Objective-C library functions are
|
|
/// used. Naive LLVM IR transformations which would otherwise be
|
|
/// behavior-preserving may break these assumptions.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ANALYSIS_OBJCARCALIASANALYSIS_H
|
|
#define LLVM_ANALYSIS_OBJCARCALIASANALYSIS_H
|
|
|
|
#include "llvm/Analysis/AliasAnalysis.h"
|
|
|
|
namespace llvm {
|
|
namespace objcarc {
|
|
|
|
/// This is a simple alias analysis implementation that uses knowledge
|
|
/// of ARC constructs to answer queries.
|
|
///
|
|
/// TODO: This class could be generalized to know about other ObjC-specific
|
|
/// tricks. Such as knowing that ivars in the non-fragile ABI are non-aliasing
|
|
/// even though their offsets are dynamic.
|
|
class ObjCARCAAResult : public AAResultBase {
|
|
const DataLayout &DL;
|
|
|
|
public:
|
|
explicit ObjCARCAAResult(const DataLayout &DL) : DL(DL) {}
|
|
ObjCARCAAResult(ObjCARCAAResult &&Arg)
|
|
: AAResultBase(std::move(Arg)), DL(Arg.DL) {}
|
|
|
|
/// 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, const Instruction *CtxI);
|
|
ModRefInfo getModRefInfoMask(const MemoryLocation &Loc, AAQueryInfo &AAQI,
|
|
bool IgnoreLocals);
|
|
|
|
using AAResultBase::getMemoryEffects;
|
|
MemoryEffects getMemoryEffects(const Function *F);
|
|
|
|
using AAResultBase::getModRefInfo;
|
|
ModRefInfo getModRefInfo(const CallBase *Call, const MemoryLocation &Loc,
|
|
AAQueryInfo &AAQI);
|
|
};
|
|
|
|
/// Analysis pass providing a never-invalidated alias analysis result.
|
|
class ObjCARCAA : public AnalysisInfoMixin<ObjCARCAA> {
|
|
friend AnalysisInfoMixin<ObjCARCAA>;
|
|
static AnalysisKey Key;
|
|
|
|
public:
|
|
typedef ObjCARCAAResult Result;
|
|
|
|
ObjCARCAAResult run(Function &F, FunctionAnalysisManager &AM);
|
|
};
|
|
|
|
} // namespace objcarc
|
|
} // namespace llvm
|
|
|
|
#endif
|