forked from OSchip/llvm-project
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
//===--- GlobalNamesInHeadersCheck.cpp - clang-tidy -----------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "GlobalNamesInHeadersCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/ASTMatchers/ASTMatchers.h"
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#include "clang/Lex/Lexer.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace google {
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namespace readability {
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void
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GlobalNamesInHeadersCheck::registerMatchers(ast_matchers::MatchFinder *Finder) {
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Finder->addMatcher(
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decl(anyOf(usingDecl(), usingDirectiveDecl()),
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hasDeclContext(translationUnitDecl())).bind("using_decl"),
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this);
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}
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void GlobalNamesInHeadersCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *D = Result.Nodes.getNodeAs<Decl>("using_decl");
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// If it comes from a macro, we'll assume it is fine.
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if (D->getLocStart().isMacroID())
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return;
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// Ignore if it comes from the "main" file ...
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if (Result.SourceManager->isInMainFile(
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Result.SourceManager->getExpansionLoc(D->getLocStart()))) {
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// unless that file is a header.
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StringRef Filename = Result.SourceManager->getFilename(
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Result.SourceManager->getSpellingLoc(D->getLocStart()));
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if (!Filename.endswith(".h"))
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return;
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}
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if (const auto* UsingDirective = dyn_cast<UsingDirectiveDecl>(D)) {
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if (UsingDirective->getNominatedNamespace()->isAnonymousNamespace()) {
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// Anynoumous namespaces inject a using directive into the AST to import
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// the names into the containing namespace.
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// We should not have them in headers, but there is another warning for
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// that.
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return;
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}
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}
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diag(D->getLocStart(),
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"using declarations in the global namespace in headers are prohibited");
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}
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} // namespace readability
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} // namespace google
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} // namespace tidy
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} // namespace clang
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