ProTypeUnionAccessCheck.cpp

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//===--- ProTypeUnionAccessCheck.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 "ProTypeUnionAccessCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
 
using namespace clang::ast_matchers;
 
namespace clang::tidy::cppcoreguidelines {
 
void ProTypeUnionAccessCheck::registerMatchers(MatchFinder *Finder) {
  Finder->addMatcher(
      memberExpr(hasObjectExpression(hasType(recordDecl(isUnion()))))
          .bind("expr"),
      this);
}
 
void ProTypeUnionAccessCheck::check(const MatchFinder::MatchResult &Result) {
  const auto *Matched = Result.Nodes.getNodeAs<MemberExpr>("expr");
  SourceLocation Loc = Matched->getMemberLoc();
  if (Loc.isInvalid())
    Loc = Matched->getBeginLoc();
  diag(Loc, "do not access members of unions; consider using (boost::)variant "
            "instead");
}
 
} // namespace clang::tidy::cppcoreguidelines