clang-tools-extra/clang-tidy/google/OverloadedUnaryAndCheck.cpp

   1 //===--- OverloadedUnaryAndCheck.cpp - clang-tidy ---------------*- C++ -*-===//
   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 "OverloadedUnaryAndCheck.h"
  10 #include "clang/AST/ASTContext.h"
  11 #include "clang/ASTMatchers/ASTMatchFinder.h"
  12 #include "clang/ASTMatchers/ASTMatchers.h"
  13
  14 using namespace clang::ast_matchers;
  15
  16 namespace clang::tidy::google::runtime {
  17
  18 void OverloadedUnaryAndCheck::registerMatchers(
  19     ast_matchers::MatchFinder *Finder) {
  20   // Match unary methods that overload operator&.
  21   Finder->addMatcher(
  22       cxxMethodDecl(parameterCountIs(0), hasOverloadedOperatorName("&"))
  23           .bind("overload"),
  24       this);
  25   // Also match freestanding unary operator& overloads. Be careful not to match
  26   // binary methods.
  27   Finder->addMatcher(functionDecl(unless(cxxMethodDecl()), parameterCountIs(1),
  28                                   hasOverloadedOperatorName("&"))
  29                          .bind("overload"),
  30                      this);
  31 }
  32
  33 void OverloadedUnaryAndCheck::check(const MatchFinder::MatchResult &Result) {
  34   const auto *Decl = Result.Nodes.getNodeAs<FunctionDecl>("overload");
  35   diag(Decl->getBeginLoc(),
  36        "do not overload unary operator&, it is dangerous.");
  37 }
  38
  39 } // namespace clang::tidy::google::runtime