1 //===- DynamicTypeInfo.h - Runtime type information -------------*- 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 #ifndef LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_DYNAMICTYPEINFO_H
10 #define LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_DYNAMICTYPEINFO_H
11 
12 #include "clang/AST/Type.h"
13 
14 namespace clang {
15 namespace ento {
16 
17 /// Stores the currently inferred strictest bound on the runtime type
18 /// of a region in a given state along the analysis path.
19 class DynamicTypeInfo {
20 public:
21   DynamicTypeInfo() {}
22 
23   DynamicTypeInfo(QualType Ty, bool CanBeSub = true)
24       : DynTy(Ty), CanBeASubClass(CanBeSub) {}
25 
26   /// Returns false if the type information is precise (the type 'DynTy' is
27   /// the only type in the lattice), true otherwise.
28   bool canBeASubClass() const { return CanBeASubClass; }
29 
30   /// Returns true if the dynamic type info is available.
31   bool isValid() const { return !DynTy.isNull(); }
32 
33   /// Returns the currently inferred upper bound on the runtime type.
34   QualType getType() const { return DynTy; }
35 
36   operator bool() const { return isValid(); }
37 
38   bool operator==(const DynamicTypeInfo &RHS) const {
39     return DynTy == RHS.DynTy && CanBeASubClass == RHS.CanBeASubClass;
40   }
41 
42   void Profile(llvm::FoldingSetNodeID &ID) const {
43     ID.Add(DynTy);
44     ID.AddBoolean(CanBeASubClass);
45   }
46 
47 private:
48   QualType DynTy;
49   bool CanBeASubClass;
50 };
51 
52 } // namespace ento
53 } // namespace clang
54 
55 #endif // LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_DYNAMICTYPEINFO_H
56