xref: /freebsd/contrib/llvm-project/llvm/include/llvm/Analysis/TypeBasedAliasAnalysis.h (revision bdd1243df58e60e85101c09001d9812a789b6bc4)
1 //===- TypeBasedAliasAnalysis.h - Type-Based Alias Analysis -----*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 /// \file
10 /// This is the interface for a metadata-based TBAA. See the source file for
11 /// details on the algorithm.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_ANALYSIS_TYPEBASEDALIASANALYSIS_H
16 #define LLVM_ANALYSIS_TYPEBASEDALIASANALYSIS_H
17 
18 #include "llvm/Analysis/AliasAnalysis.h"
19 #include "llvm/IR/PassManager.h"
20 #include "llvm/Pass.h"
21 #include <memory>
22 
23 namespace llvm {
24 
25 class CallBase;
26 class Function;
27 class MDNode;
28 class MemoryLocation;
29 
30 /// A simple AA result that uses TBAA metadata to answer queries.
31 class TypeBasedAAResult : public AAResultBase {
32 public:
33   /// Handle invalidation events from the new pass manager.
34   ///
35   /// By definition, this result is stateless and so remains valid.
invalidate(Function &,const PreservedAnalyses &,FunctionAnalysisManager::Invalidator &)36   bool invalidate(Function &, const PreservedAnalyses &,
37                   FunctionAnalysisManager::Invalidator &) {
38     return false;
39   }
40 
41   AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB,
42                     AAQueryInfo &AAQI, const Instruction *CtxI);
43   ModRefInfo getModRefInfoMask(const MemoryLocation &Loc, AAQueryInfo &AAQI,
44                                bool IgnoreLocals);
45 
46   MemoryEffects getMemoryEffects(const CallBase *Call, AAQueryInfo &AAQI);
47   MemoryEffects getMemoryEffects(const Function *F);
48   ModRefInfo getModRefInfo(const CallBase *Call, const MemoryLocation &Loc,
49                            AAQueryInfo &AAQI);
50   ModRefInfo getModRefInfo(const CallBase *Call1, const CallBase *Call2,
51                            AAQueryInfo &AAQI);
52 
53 private:
54   bool Aliases(const MDNode *A, const MDNode *B) const;
55 };
56 
57 /// Analysis pass providing a never-invalidated alias analysis result.
58 class TypeBasedAA : public AnalysisInfoMixin<TypeBasedAA> {
59   friend AnalysisInfoMixin<TypeBasedAA>;
60 
61   static AnalysisKey Key;
62 
63 public:
64   using Result = TypeBasedAAResult;
65 
66   TypeBasedAAResult run(Function &F, FunctionAnalysisManager &AM);
67 };
68 
69 /// Legacy wrapper pass to provide the TypeBasedAAResult object.
70 class TypeBasedAAWrapperPass : public ImmutablePass {
71   std::unique_ptr<TypeBasedAAResult> Result;
72 
73 public:
74   static char ID;
75 
76   TypeBasedAAWrapperPass();
77 
getResult()78   TypeBasedAAResult &getResult() { return *Result; }
getResult()79   const TypeBasedAAResult &getResult() const { return *Result; }
80 
81   bool doInitialization(Module &M) override;
82   bool doFinalization(Module &M) override;
83   void getAnalysisUsage(AnalysisUsage &AU) const override;
84 };
85 
86 //===--------------------------------------------------------------------===//
87 //
88 // createTypeBasedAAWrapperPass - This pass implements metadata-based
89 // type-based alias analysis.
90 //
91 ImmutablePass *createTypeBasedAAWrapperPass();
92 
93 } // end namespace llvm
94 
95 #endif // LLVM_ANALYSIS_TYPEBASEDALIASANALYSIS_H
96