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//===--- ImplementationInNamespaceCheck.cpp - clang-tidy ------------------===//
//
// 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 "ImplementationInNamespaceCheck.h"
#include "NamespaceConstants.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang::tidy::llvm_libc {
void ImplementationInNamespaceCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
translationUnitDecl(
forEach(decl(isExpansionInMainFile(), unless(linkageSpecDecl()),
// anonymous namespaces generate usingDirective
unless(usingDirectiveDecl(isImplicit())))
.bind("child_of_translation_unit"))),
this);
}
void ImplementationInNamespaceCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *MatchedDecl =
Result.Nodes.getNodeAs<Decl>("child_of_translation_unit");
const auto *NS = dyn_cast<NamespaceDecl>(MatchedDecl);
// LLVM libc declarations should be inside of a non-anonymous namespace.
if (NS == nullptr || NS->isAnonymousNamespace()) {
diag(MatchedDecl->getLocation(),
"declaration must be enclosed within the '%0' namespace")
<< RequiredNamespaceDeclMacroName;
return;
}
// Enforce that the namespace is the result of macro expansion
if (Result.SourceManager->isMacroBodyExpansion(NS->getLocation()) == false) {
diag(NS->getLocation(), "the outermost namespace should be the '%0' macro")
<< RequiredNamespaceDeclMacroName;
return;
}
// We want the macro to have [[gnu::visibility("hidden")]] as a prefix, but
// visibility is just an attribute in the AST construct, so we check that
// instead.
if (NS->getVisibility() != Visibility::HiddenVisibility) {
diag(NS->getLocation(), "the '%0' macro should start with '%1'")
<< RequiredNamespaceDeclMacroName << RequiredNamespaceDeclStart;
return;
}
// Lastly, make sure the namespace name actually has the __llvm_libc prefix
if (NS->getName().starts_with(RequiredNamespaceRefStart) == false) {
diag(NS->getLocation(), "the '%0' macro expansion should start with '%1'")
<< RequiredNamespaceDeclMacroName << RequiredNamespaceRefStart;
return;
}
}
} // namespace clang::tidy::llvm_libc
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