OverloadedUnaryAndCheck.cpp

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//===--- OverloadedUnaryAndCheck.cpp - clang-tidy ---------------*- C++ -*-===//
//
// 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 "OverloadedUnaryAndCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchers.h"
 
using namespace clang::ast_matchers;
 
namespace clang {
namespace tidy {
namespace google {
namespace runtime {
 
void OverloadedUnaryAndCheck::registerMatchers(
    ast_matchers::MatchFinder *Finder) {
  // Match unary methods that overload operator&.
  Finder->addMatcher(
      cxxMethodDecl(parameterCountIs(0), hasOverloadedOperatorName("&"))
          .bind("overload"),
      this);
  // Also match freestanding unary operator& overloads. Be careful not to match
  // binary methods.
  Finder->addMatcher(functionDecl(unless(cxxMethodDecl()), parameterCountIs(1),
                                  hasOverloadedOperatorName("&"))
                         .bind("overload"),
                     this);
}
 
void OverloadedUnaryAndCheck::check(const MatchFinder::MatchResult &Result) {
  const auto *Decl = Result.Nodes.getNodeAs<FunctionDecl>("overload");
  diag(Decl->getBeginLoc(),
       "do not overload unary operator&, it is dangerous.");
}
 
} // namespace runtime
} // namespace google
} // namespace tidy
} // namespace clang