1 //===--- ProTypeUnionAccessCheck.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 "ProTypeUnionAccessCheck.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::cppcoreguidelines { 16 17 void ProTypeUnionAccessCheck::registerMatchers(MatchFinder *Finder) { 18 Finder->addMatcher( 19 memberExpr(hasObjectExpression(hasType(recordDecl(isUnion())))) 20 .bind("expr"), 21 this); 22 } 23 24 void ProTypeUnionAccessCheck::check(const MatchFinder::MatchResult &Result) { 25 const auto *Matched = Result.Nodes.getNodeAs<MemberExpr>("expr"); 26 SourceLocation Loc = Matched->getMemberLoc(); 27 if (Loc.isInvalid()) 28 Loc = Matched->getBeginLoc(); 29 diag(Loc, "do not access members of unions; consider using (boost::)variant " 30 "instead"); 31 } 32 33 } // namespace clang::tidy::cppcoreguidelines 34