clang  6.0.0svn
BaseSubobject.h
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1 //===- BaseSubobject.h - BaseSubobject class --------------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file provides a definition of the BaseSubobject class.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_CLANG_AST_BASESUBOBJECT_H
15 #define LLVM_CLANG_AST_BASESUBOBJECT_H
16 
17 #include "clang/AST/CharUnits.h"
18 #include "llvm/ADT/DenseMapInfo.h"
19 #include "llvm/Support/type_traits.h"
20 #include <cstdint>
21 #include <utility>
22 
23 namespace clang {
24 
25 class CXXRecordDecl;
26 
27 // BaseSubobject - Uniquely identifies a direct or indirect base class.
28 // Stores both the base class decl and the offset from the most derived class to
29 // the base class. Used for vtable and VTT generation.
31  /// Base - The base class declaration.
32  const CXXRecordDecl *Base;
33 
34  /// BaseOffset - The offset from the most derived class to the base class.
35  CharUnits BaseOffset;
36 
37 public:
38  BaseSubobject() = default;
39  BaseSubobject(const CXXRecordDecl *Base, CharUnits BaseOffset)
40  : Base(Base), BaseOffset(BaseOffset) {}
41 
42  /// getBase - Returns the base class declaration.
43  const CXXRecordDecl *getBase() const { return Base; }
44 
45  /// getBaseOffset - Returns the base class offset.
46  CharUnits getBaseOffset() const { return BaseOffset; }
47 
48  friend bool operator==(const BaseSubobject &LHS, const BaseSubobject &RHS) {
49  return LHS.Base == RHS.Base && LHS.BaseOffset == RHS.BaseOffset;
50  }
51 };
52 
53 } // namespace clang
54 
55 namespace llvm {
56 
57 template<> struct DenseMapInfo<clang::BaseSubobject> {
59  return clang::BaseSubobject(
62  }
63 
65  return clang::BaseSubobject(
68  }
69 
70  static unsigned getHashValue(const clang::BaseSubobject &Base) {
71  using PairTy = std::pair<const clang::CXXRecordDecl *, clang::CharUnits>;
72 
73  return DenseMapInfo<PairTy>::getHashValue(PairTy(Base.getBase(),
74  Base.getBaseOffset()));
75  }
76 
77  static bool isEqual(const clang::BaseSubobject &LHS,
78  const clang::BaseSubobject &RHS) {
79  return LHS == RHS;
80  }
81 };
82 
83 // It's OK to treat BaseSubobject as a POD type.
84 template <> struct isPodLike<clang::BaseSubobject> {
85  static const bool value = true;
86 };
87 
88 } // namespace llvm
89 
90 #endif // LLVM_CLANG_AST_BASESUBOBJECT_H
DominatorTree GraphTraits specialization so the DominatorTree can be iterable by generic graph iterat...
Definition: Dominators.h:26
CharUnits getBaseOffset() const
getBaseOffset - Returns the base class offset.
Definition: BaseSubobject.h:46
static bool isEqual(const clang::BaseSubobject &LHS, const clang::BaseSubobject &RHS)
Definition: BaseSubobject.h:77
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
friend bool operator==(const BaseSubobject &LHS, const BaseSubobject &RHS)
Definition: BaseSubobject.h:48
static CharUnits fromQuantity(QuantityType Quantity)
fromQuantity - Construct a CharUnits quantity from a raw integer type.
Definition: CharUnits.h:63
const CXXRecordDecl * getBase() const
getBase - Returns the base class declaration.
Definition: BaseSubobject.h:43
static clang::BaseSubobject getTombstoneKey()
Definition: BaseSubobject.h:64
BaseSubobject(const CXXRecordDecl *Base, CharUnits BaseOffset)
Definition: BaseSubobject.h:39
static unsigned getHashValue(const clang::BaseSubobject &Base)
Definition: BaseSubobject.h:70
Dataflow Directional Tag Classes.
static clang::BaseSubobject getEmptyKey()
Definition: BaseSubobject.h:58
Represents a C++ struct/union/class.
Definition: DeclCXX.h:299