| 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(Quantity: 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(Quantity: 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(PairVal: 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 |
| 86 |