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  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
  86.