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//===--- GlobalNamesInHeadersCheck.cpp - clang-tidy -----------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "GlobalNamesInHeadersCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/Lex/Lexer.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace google {
namespace readability {
GlobalNamesInHeadersCheck::GlobalNamesInHeadersCheck(StringRef Name,
ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
RawStringHeaderFileExtensions(Options.getLocalOrGlobal(
"HeaderFileExtensions", utils::defaultHeaderFileExtensions())) {
if (!utils::parseHeaderFileExtensions(RawStringHeaderFileExtensions,
HeaderFileExtensions, ',')) {
llvm::errs() << "Invalid header file extension: "
<< RawStringHeaderFileExtensions << "\n";
}
}
void GlobalNamesInHeadersCheck::storeOptions(
ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "HeaderFileExtensions", RawStringHeaderFileExtensions);
}
void GlobalNamesInHeadersCheck::registerMatchers(
ast_matchers::MatchFinder *Finder) {
Finder->addMatcher(decl(anyOf(usingDecl(), usingDirectiveDecl()),
hasDeclContext(translationUnitDecl()))
.bind("using_decl"),
this);
}
void GlobalNamesInHeadersCheck::check(const MatchFinder::MatchResult &Result) {
const auto *D = Result.Nodes.getNodeAs<Decl>("using_decl");
// If it comes from a macro, we'll assume it is fine.
if (D->getBeginLoc().isMacroID())
return;
// Ignore if it comes from the "main" file ...
if (Result.SourceManager->isInMainFile(
Result.SourceManager->getExpansionLoc(D->getBeginLoc()))) {
// unless that file is a header.
if (!utils::isSpellingLocInHeaderFile(
D->getBeginLoc(), *Result.SourceManager, HeaderFileExtensions))
return;
}
if (const auto *UsingDirective = dyn_cast<UsingDirectiveDecl>(D)) {
if (UsingDirective->getNominatedNamespace()->isAnonymousNamespace()) {
// Anynoumous namespaces inject a using directive into the AST to import
// the names into the containing namespace.
// We should not have them in headers, but there is another warning for
// that.
return;
}
}
diag(D->getBeginLoc(),
"using declarations in the global namespace in headers are prohibited");
}
} // namespace readability
} // namespace google
} // namespace tidy
} // namespace clang
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