clang-tools-extra/clang-tidy/fuchsia/VirtualInheritanceCheck.cpp

   1 //===--- VirtualInheritanceCheck.cpp - clang-tidy--------------------------===//
   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 #include "VirtualInheritanceCheck.h"
  10 #include "clang/AST/ASTContext.h"
  11 #include "clang/ASTMatchers/ASTMatchFinder.h"
  12
  13 using namespace clang::ast_matchers;
  14
  15 namespace clang::tidy::fuchsia {
  16
  17 namespace {
  18 AST_MATCHER(CXXRecordDecl, hasDirectVirtualBaseClass) {
  19   if (!Node.hasDefinition()) return false;
  20   if (!Node.getNumVBases()) return false;
  21   for (const CXXBaseSpecifier &Base : Node.bases())
  22     if (Base.isVirtual()) return true;
  23   return false;
  24 }
  25 } // namespace
  26
  27 void VirtualInheritanceCheck::registerMatchers(MatchFinder *Finder) {
  28   // Defining classes using direct virtual inheritance is disallowed.
  29   Finder->addMatcher(cxxRecordDecl(hasDirectVirtualBaseClass()).bind("decl"),
  30                      this);
  31 }
  32
  33 void VirtualInheritanceCheck::check(const MatchFinder::MatchResult &Result) {
  34   if (const auto *D = Result.Nodes.getNodeAs<CXXRecordDecl>("decl"))
  35     diag(D->getBeginLoc(), "direct virtual inheritance is disallowed");
  36 }
  37
  38 } // namespace clang::tidy::fuchsia