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1 //===--- VirtualInheritanceCheck.cpp - clang-tidy--------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "VirtualInheritanceCheck.h"
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10 #include "clang/AST/ASTContext.h"
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11 #include "clang/ASTMatchers/ASTMatchFinder.h"
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12
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13 using namespace clang::ast_matchers;
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14
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15 namespace clang {
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16 namespace tidy {
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17 namespace fuchsia {
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18
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19 namespace {
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20 AST_MATCHER(CXXRecordDecl, hasDirectVirtualBaseClass) {
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21 if (!Node.hasDefinition()) return false;
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22 if (!Node.getNumVBases()) return false;
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23 for (const CXXBaseSpecifier &Base : Node.bases())
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24 if (Base.isVirtual()) return true;
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25 return false;
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26 }
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27 } // namespace
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28
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29 void VirtualInheritanceCheck::registerMatchers(MatchFinder *Finder) {
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30 // Defining classes using direct virtual inheritance is disallowed.
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31 Finder->addMatcher(cxxRecordDecl(hasDirectVirtualBaseClass()).bind("decl"),
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32 this);
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33 }
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34
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35 void VirtualInheritanceCheck::check(const MatchFinder::MatchResult &Result) {
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36 if (const auto *D = Result.Nodes.getNodeAs<CXXRecordDecl>("decl"))
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37 diag(D->getBeginLoc(), "direct virtual inheritance is disallowed");
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38 }
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39
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40 } // namespace fuchsia
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41 } // namespace tidy
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42 } // namespace clang
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