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 {
  16 namespace tidy {
  17 namespace fuchsia {
  18
  19 namespace {
  20 AST_MATCHER(CXXRecordDecl, hasDirectVirtualBaseClass) {
  21   if (!Node.hasDefinition()) return false;
  22   if (!Node.getNumVBases()) return false;
  23   for (const CXXBaseSpecifier &Base : Node.bases())
  24     if (Base.isVirtual()) return true;
  25   return false;
  26 }
  27 } // namespace
  28
  29 void VirtualInheritanceCheck::registerMatchers(MatchFinder *Finder) {
  30   // Defining classes using direct virtual inheritance is disallowed.
  31   Finder->addMatcher(cxxRecordDecl(hasDirectVirtualBaseClass()).bind("decl"),
  32                      this);
  33 }
  34
  35 void VirtualInheritanceCheck::check(const MatchFinder::MatchResult &Result) {
  36   if (const auto *D = Result.Nodes.getNodeAs<CXXRecordDecl>("decl"))
  37     diag(D->getBeginLoc(), "direct virtual inheritance is disallowed");
  38 }
  39
  40 }  // namespace fuchsia
  41 }  // namespace tidy
  42 }  // namespace clang