xref: /llvm-project/clang-tools-extra/clang-tidy/google/UnnamedNamespaceInHeaderCheck.cpp (revision cc38cd856d9a9df77d5d727377e38a891807774b)
1 //===--- UnnamedNamespaceInHeaderCheck.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 "UnnamedNamespaceInHeaderCheck.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::build {
17 
UnnamedNamespaceInHeaderCheck(StringRef Name,ClangTidyContext * Context)18 UnnamedNamespaceInHeaderCheck::UnnamedNamespaceInHeaderCheck(
19     StringRef Name, ClangTidyContext *Context)
20     : ClangTidyCheck(Name, Context),
21       HeaderFileExtensions(Context->getHeaderFileExtensions()) {}
22 
registerMatchers(ast_matchers::MatchFinder * Finder)23 void UnnamedNamespaceInHeaderCheck::registerMatchers(
24     ast_matchers::MatchFinder *Finder) {
25     Finder->addMatcher(namespaceDecl(isAnonymous()).bind("anonymousNamespace"),
26                        this);
27 }
28 
check(const MatchFinder::MatchResult & Result)29 void UnnamedNamespaceInHeaderCheck::check(
30     const MatchFinder::MatchResult &Result) {
31   const auto *N = Result.Nodes.getNodeAs<NamespaceDecl>("anonymousNamespace");
32   SourceLocation Loc = N->getBeginLoc();
33   if (!Loc.isValid())
34     return;
35 
36   if (utils::isPresumedLocInHeaderFile(Loc, *Result.SourceManager,
37                                        HeaderFileExtensions))
38     diag(Loc, "do not use unnamed namespaces in header files");
39 }
40 
41 } // namespace clang::tidy::google::build
42