SpecialMemberFunctionsCheck.h

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//===--- SpecialMemberFunctionsCheck.h - clang-tidy--------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CPPCOREGUIDELINES_SPECIAL_MEMBER_FUNCTIONS_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CPPCOREGUIDELINES_SPECIAL_MEMBER_FUNCTIONS_H
 
#include "../ClangTidyCheck.h"
 
#include "llvm/ADT/DenseMapInfo.h"
 
namespace clang {
namespace tidy {
namespace cppcoreguidelines {
 
/// Checks for classes where some, but not all, of the special member functions
/// are defined.
///
/// For the user-facing documentation see:
/// http://clang.llvm.org/extra/clang-tidy/checks/cppcoreguidelines-special-member-functions.html
class SpecialMemberFunctionsCheck : public ClangTidyCheck {
public:
  SpecialMemberFunctionsCheck(StringRef Name, ClangTidyContext *Context);
  bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
    return LangOpts.CPlusPlus;
  }
  void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
  void onEndOfTranslationUnit() override;
  llvm::Optional<TraversalKind> getCheckTraversalKind() const override {
    return TK_IgnoreUnlessSpelledInSource;
  }
  enum class SpecialMemberFunctionKind : uint8_t {
    Destructor,
    DefaultDestructor,
    NonDefaultDestructor,
    CopyConstructor,
    CopyAssignment,
    MoveConstructor,
    MoveAssignment
  };
 
  struct SpecialMemberFunctionData {
    SpecialMemberFunctionKind FunctionKind;
    bool IsDeleted;
 
    bool operator==(const SpecialMemberFunctionData &Other) {
      return (Other.FunctionKind == FunctionKind) &&
             (Other.IsDeleted == IsDeleted);
    }
  };
 
  using ClassDefId = std::pair<SourceLocation, std::string>;
 
  using ClassDefiningSpecialMembersMap =
      llvm::DenseMap<ClassDefId,
                     llvm::SmallVector<SpecialMemberFunctionData, 5>>;
 
private:
  void checkForMissingMembers(
      const ClassDefId &ID,
      llvm::ArrayRef<SpecialMemberFunctionData> DefinedSpecialMembers);
 
  const bool AllowMissingMoveFunctions;
  const bool AllowSoleDefaultDtor;
  const bool AllowMissingMoveFunctionsWhenCopyIsDeleted;
  ClassDefiningSpecialMembersMap ClassWithSpecialMembers;
};
 
} // namespace cppcoreguidelines
} // namespace tidy
} // namespace clang
 
namespace llvm {
/// Specialization of DenseMapInfo to allow ClassDefId objects in DenseMaps
/// FIXME: Move this to the corresponding cpp file as is done for
/// clang-tidy/readability/IdentifierNamingCheck.cpp.
template <>
struct DenseMapInfo<
    clang::tidy::cppcoreguidelines::SpecialMemberFunctionsCheck::ClassDefId> {
  using ClassDefId =
      clang::tidy::cppcoreguidelines::SpecialMemberFunctionsCheck::ClassDefId;
 
  static inline ClassDefId getEmptyKey() {
    return ClassDefId(DenseMapInfo<clang::SourceLocation>::getEmptyKey(),
                      "EMPTY");
  }
 
  static inline ClassDefId getTombstoneKey() {
    return ClassDefId(DenseMapInfo<clang::SourceLocation>::getTombstoneKey(),
                      "TOMBSTONE");
  }
 
  static unsigned getHashValue(ClassDefId Val) {
    assert(Val != getEmptyKey() && "Cannot hash the empty key!");
    assert(Val != getTombstoneKey() && "Cannot hash the tombstone key!");
 
    std::hash<ClassDefId::second_type> SecondHash;
    return Val.first.getHashValue() + SecondHash(Val.second);
  }
 
  static bool isEqual(const ClassDefId &LHS, const ClassDefId &RHS) {
    if (RHS == getEmptyKey())
      return LHS == getEmptyKey();
    if (RHS == getTombstoneKey())
      return LHS == getTombstoneKey();
    return LHS == RHS;
  }
};
 
} // namespace llvm
 
#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CPPCOREGUIDELINES_SPECIAL_MEMBER_FUNCTIONS_H