1//===--- GlobalNamesInHeadersCheck.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 "GlobalNamesInHeadersCheck.h"
10#include "clang/ASTMatchers/ASTMatchFinder.h"
11#include "clang/ASTMatchers/ASTMatchers.h"
12#include "clang/Lex/Lexer.h"
13
14using namespace clang::ast_matchers;
15
16namespace clang::tidy::google::readability {
17
18GlobalNamesInHeadersCheck::GlobalNamesInHeadersCheck(StringRef Name,
19 ClangTidyContext *Context)
20 : ClangTidyCheck(Name, Context),
21 HeaderFileExtensions(Context->getHeaderFileExtensions()) {}
22
23void GlobalNamesInHeadersCheck::registerMatchers(
24 ast_matchers::MatchFinder *Finder) {
25 Finder->addMatcher(NodeMatch: decl(anyOf(usingDecl(), usingDirectiveDecl()),
26 hasDeclContext(InnerMatcher: translationUnitDecl()))
27 .bind(ID: "using_decl"),
28 Action: this);
29}
30
31void GlobalNamesInHeadersCheck::check(const MatchFinder::MatchResult &Result) {
32 const auto *D = Result.Nodes.getNodeAs<Decl>(ID: "using_decl");
33 // If it comes from a macro, we'll assume it is fine.
34 if (D->getBeginLoc().isMacroID())
35 return;
36
37 // Ignore if it comes from the "main" file ...
38 if (Result.SourceManager->isInMainFile(
39 Loc: Result.SourceManager->getExpansionLoc(Loc: D->getBeginLoc()))) {
40 // unless that file is a header.
41 if (!utils::isSpellingLocInHeaderFile(
42 Loc: D->getBeginLoc(), SM&: *Result.SourceManager, HeaderFileExtensions))
43 return;
44 }
45
46 if (const auto *UsingDirective = dyn_cast<UsingDirectiveDecl>(Val: D)) {
47 if (UsingDirective->getNominatedNamespace()->isAnonymousNamespace()) {
48 // Anonymous namespaces inject a using directive into the AST to import
49 // the names into the containing namespace.
50 // We should not have them in headers, but there is another warning for
51 // that.
52 return;
53 }
54 }
55
56 diag(Loc: D->getBeginLoc(),
57 Description: "using declarations in the global namespace in headers are prohibited");
58}
59
60} // namespace clang::tidy::google::readability
61

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source code of clang-tools-extra/clang-tidy/google/GlobalNamesInHeadersCheck.cpp