VirtualInheritanceCheck.cpp

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//===--- VirtualInheritanceCheck.cpp - clang-tidy--------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
 
#include "VirtualInheritanceCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
 
using namespace clang::ast_matchers;
 
namespace clang::tidy::fuchsia {
 
namespace {
AST_MATCHER(CXXRecordDecl, hasDirectVirtualBaseClass) {
  if (!Node.hasDefinition()) return false;
  if (!Node.getNumVBases()) return false;
  for (const CXXBaseSpecifier &Base : Node.bases())
    if (Base.isVirtual()) return true;
  return false;
}
} // namespace
 
void VirtualInheritanceCheck::registerMatchers(MatchFinder *Finder) {
  // Defining classes using direct virtual inheritance is disallowed.
  Finder->addMatcher(cxxRecordDecl(hasDirectVirtualBaseClass()).bind("decl"),
                     this);
}
 
void VirtualInheritanceCheck::check(const MatchFinder::MatchResult &Result) {
  if (const auto *D = Result.Nodes.getNodeAs<CXXRecordDecl>("decl"))
    diag(D->getBeginLoc(), "direct virtual inheritance is disallowed");
}
 
} // namespace clang::tidy::fuchsia