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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- BaseSubobject.h - BaseSubobject class --------------------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file provides a definition of the BaseSubobject class. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |||
| 13 | #ifndef LLVM_CLANG_AST_BASESUBOBJECT_H |
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| 14 | #define LLVM_CLANG_AST_BASESUBOBJECT_H |
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| 15 | |||
| 16 | #include "clang/AST/CharUnits.h" |
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| 17 | #include "clang/AST/DeclCXX.h" |
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| 18 | #include "llvm/ADT/DenseMapInfo.h" |
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| 19 | #include "llvm/Support/type_traits.h" |
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| 20 | #include <cstdint> |
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| 21 | #include <utility> |
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| 22 | |||
| 23 | namespace clang { |
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| 24 | |||
| 25 | class CXXRecordDecl; |
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| 26 | |||
| 27 | // BaseSubobject - Uniquely identifies a direct or indirect base class. |
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| 28 | // Stores both the base class decl and the offset from the most derived class to |
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| 29 | // the base class. Used for vtable and VTT generation. |
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| 30 | class BaseSubobject { |
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| 31 | /// Base - The base class declaration. |
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| 32 | const CXXRecordDecl *Base; |
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| 33 | |||
| 34 | /// BaseOffset - The offset from the most derived class to the base class. |
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| 35 | CharUnits BaseOffset; |
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| 36 | |||
| 37 | public: |
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| 38 | BaseSubobject() = default; |
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| 39 | BaseSubobject(const CXXRecordDecl *Base, CharUnits BaseOffset) |
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| 40 | : Base(Base), BaseOffset(BaseOffset) {} |
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| 41 | |||
| 42 | /// getBase - Returns the base class declaration. |
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| 43 | const CXXRecordDecl *getBase() const { return Base; } |
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| 44 | |||
| 45 | /// getBaseOffset - Returns the base class offset. |
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| 46 | CharUnits getBaseOffset() const { return BaseOffset; } |
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| 47 | |||
| 48 | friend bool operator==(const BaseSubobject &LHS, const BaseSubobject &RHS) { |
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| 49 | return LHS.Base == RHS.Base && LHS.BaseOffset == RHS.BaseOffset; |
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| 50 | } |
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| 51 | }; |
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| 52 | |||
| 53 | } // namespace clang |
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| 54 | |||
| 55 | namespace llvm { |
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| 56 | |||
| 57 | template<> struct DenseMapInfo<clang::BaseSubobject> { |
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| 58 | static clang::BaseSubobject getEmptyKey() { |
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| 59 | return clang::BaseSubobject( |
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| 60 | DenseMapInfo<const clang::CXXRecordDecl *>::getEmptyKey(), |
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| 61 | clang::CharUnits::fromQuantity(DenseMapInfo<int64_t>::getEmptyKey())); |
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| 62 | } |
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| 63 | |||
| 64 | static clang::BaseSubobject getTombstoneKey() { |
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| 65 | return clang::BaseSubobject( |
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| 66 | DenseMapInfo<const clang::CXXRecordDecl *>::getTombstoneKey(), |
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| 67 | clang::CharUnits::fromQuantity(DenseMapInfo<int64_t>::getTombstoneKey())); |
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| 68 | } |
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| 69 | |||
| 70 | static unsigned getHashValue(const clang::BaseSubobject &Base) { |
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| 71 | using PairTy = std::pair<const clang::CXXRecordDecl *, clang::CharUnits>; |
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| 72 | |||
| 73 | return DenseMapInfo<PairTy>::getHashValue(PairTy(Base.getBase(), |
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| 74 | Base.getBaseOffset())); |
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| 75 | } |
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| 76 | |||
| 77 | static bool isEqual(const clang::BaseSubobject &LHS, |
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| 78 | const clang::BaseSubobject &RHS) { |
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| 79 | return LHS == RHS; |
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| 80 | } |
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| 81 | }; |
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| 82 | |||
| 83 | } // namespace llvm |
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| 84 | |||
| 85 | #endif // LLVM_CLANG_AST_BASESUBOBJECT_H |