1 //===--- DontModifyStdNamespaceCheck.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 "DontModifyStdNamespaceCheck.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 cert {
18 
19 void DontModifyStdNamespaceCheck::registerMatchers(MatchFinder *Finder) {
20   if (!getLangOpts().CPlusPlus)
21     return;
22 
23   Finder->addMatcher(
24       namespaceDecl(unless(isExpansionInSystemHeader()),
25                     anyOf(hasName("std"), hasName("posix")),
26                     has(decl(unless(anyOf(
27                         functionDecl(isExplicitTemplateSpecialization()),
28                         cxxRecordDecl(isExplicitTemplateSpecialization()))))))
29           .bind("nmspc"),
30       this);
31 }
32 
33 void DontModifyStdNamespaceCheck::check(
34     const MatchFinder::MatchResult &Result) {
35   const auto *N = Result.Nodes.getNodeAs<NamespaceDecl>("nmspc");
36 
37   // Only consider top level namespaces.
38   if (N->getParent() != Result.Context->getTranslationUnitDecl())
39     return;
40 
41   diag(N->getLocation(),
42        "modification of %0 namespace can result in undefined behavior")
43       << N;
44 }
45 
46 } // namespace cert
47 } // namespace tidy
48 } // namespace clang
49