clang-tools-extra/clang-tidy/cppcoreguidelines/AvoidConstOrRefDataMembersCheck.cpp

   1 //===--- AvoidConstOrRefDataMembersCheck.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 "AvoidConstOrRefDataMembersCheck.h"
  10 #include "clang/AST/ASTContext.h"
  11 #include "clang/ASTMatchers/ASTMatchFinder.h"
  12
  13 using namespace clang::ast_matchers;
  14
  15 namespace clang {
  16 namespace tidy {
  17 namespace cppcoreguidelines {
  18 namespace {
  19
  20 AST_MATCHER(FieldDecl, isMemberOfLambda) {
  21   return Node.getParent()->isLambda();
  22 }
  23
  24 } // namespace
  25
  26 void AvoidConstOrRefDataMembersCheck::registerMatchers(MatchFinder *Finder) {
  27   Finder->addMatcher(fieldDecl(unless(isMemberOfLambda()),
  28                                hasType(hasCanonicalType(referenceType())))
  29                          .bind("ref"),
  30                      this);
  31   Finder->addMatcher(fieldDecl(unless(isMemberOfLambda()),
  32                                hasType(qualType(isConstQualified())))
  33                          .bind("const"),
  34                      this);
  35 }
  36
  37 void AvoidConstOrRefDataMembersCheck::check(
  38     const MatchFinder::MatchResult &Result) {
  39   if (const auto *MatchedDecl = Result.Nodes.getNodeAs<FieldDecl>("ref"))
  40     diag(MatchedDecl->getLocation(), "member %0 of type %1 is a reference")
  41         << MatchedDecl << MatchedDecl->getType();
  42   if (const auto *MatchedDecl = Result.Nodes.getNodeAs<FieldDecl>("const"))
  43     diag(MatchedDecl->getLocation(), "member %0 of type %1 is const qualified")
  44         << MatchedDecl << MatchedDecl->getType();
  45 }
  46
  47 } // namespace cppcoreguidelines
  48 } // namespace tidy
  49 } // namespace clang