clang 10.0.0git

BaseSubobject.h
Go to the documentation of this file.
1 //===- BaseSubobject.h - BaseSubobject class --------------------*- 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 // This file provides a definition of the BaseSubobject class.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #ifndef LLVM_CLANG_AST_BASESUBOBJECT_H
14 #define LLVM_CLANG_AST_BASESUBOBJECT_H
15
16 #include "clang/AST/CharUnits.h"
17 #include "clang/AST/DeclCXX.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.
30 class BaseSubobject {
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> {
58 static clang::BaseSubobject getEmptyKey() {
59 return clang::BaseSubobject(
60 DenseMapInfo<const clang::CXXRecordDecl *>::getEmptyKey(),
61 clang::CharUnits::fromQuantity(DenseMapInfo<int64_t>::getEmptyKey()));
62 }
63
64 static clang::BaseSubobject getTombstoneKey() {
65 return clang::BaseSubobject(
66 DenseMapInfo<const clang::CXXRecordDecl *>::getTombstoneKey(),
67 clang::CharUnits::fromQuantity(DenseMapInfo<int64_t>::getTombstoneKey()));
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 } // namespace llvm
84
85 #endif // LLVM_CLANG_AST_BASESUBOBJECT_H
llvm
Specialize PointerLikeTypeTraits to allow LazyGenerationalUpdatePtr to be placed into a PointerUnion...
Definition: Dominators.h:30
Base
llvm::DenseMapInfo
Definition: TypeOrdering.h:37
clang::BaseSubobject::getBaseOffset
CharUnits getBaseOffset() const
getBaseOffset - Returns the base class offset.
Definition: BaseSubobject.h:46
CharUnits.h
llvm::DenseMapInfo< clang::BaseSubobject >::isEqual
static bool isEqual(const clang::BaseSubobject &LHS, const clang::BaseSubobject &RHS)
Definition: BaseSubobject.h:77
clang::CharUnits
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
clang::BaseSubobject::BaseSubobject
BaseSubobject()=default
clang::BaseSubobject::operator==
friend bool operator==(const BaseSubobject &LHS, const BaseSubobject &RHS)
Definition: BaseSubobject.h:48
clang::CharUnits::fromQuantity
static CharUnits fromQuantity(QuantityType Quantity)
fromQuantity - Construct a CharUnits quantity from a raw integer type.
Definition: CharUnits.h:63
clang::BaseSubobject::getBase
const CXXRecordDecl * getBase() const
getBase - Returns the base class declaration.
Definition: BaseSubobject.h:43
clang::BaseSubobject
Definition: BaseSubobject.h:30
llvm::DenseMapInfo< clang::BaseSubobject >::getTombstoneKey
static clang::BaseSubobject getTombstoneKey()
Definition: BaseSubobject.h:64
clang::BaseSubobject::BaseSubobject
BaseSubobject(const CXXRecordDecl *Base, CharUnits BaseOffset)
Definition: BaseSubobject.h:39
llvm::DenseMapInfo< clang::BaseSubobject >::getHashValue
static unsigned getHashValue(const clang::BaseSubobject &Base)
Definition: BaseSubobject.h:70
clang
Dataflow Directional Tag Classes.
Definition: CFGReachabilityAnalysis.h:21
DeclCXX.h
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).
llvm::DenseMapInfo< clang::BaseSubobject >::getEmptyKey
static clang::BaseSubobject getEmptyKey()
Definition: BaseSubobject.h:58
clang::CXXRecordDecl
Represents a C++ struct/union/class.
Definition: DeclCXX.h:253