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//===--- UnusedAliasDeclsCheck.cpp - clang-tidy----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "UnusedAliasDeclsCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Lex/Lexer.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
// FIXME: Move this to ASTMatchers.h.
const ast_matchers::internal::VariadicDynCastAllOfMatcher<
Decl, NamespaceAliasDecl> namespaceAliasDecl;
void UnusedAliasDeclsCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(namespaceAliasDecl().bind("alias"), this);
Finder->addMatcher(nestedNameSpecifier().bind("nns"), this);
}
void UnusedAliasDeclsCheck::check(const MatchFinder::MatchResult &Result) {
if (const auto *AliasDecl = Result.Nodes.getNodeAs<Decl>("alias")) {
// We cannot do anything about headers (yet), as the alias declarations used
// in one header could be used by some other translation unit.
if (!Result.SourceManager->isInMainFile(AliasDecl->getLocation()))
return;
FoundDecls[AliasDecl] = CharSourceRange::getCharRange(
AliasDecl->getLocStart(),
Lexer::findLocationAfterToken(
AliasDecl->getLocEnd(), tok::semi, *Result.SourceManager,
Result.Context->getLangOpts(),
/*SkipTrailingWhitespaceAndNewLine=*/true));
return;
}
if (const auto *NestedName =
Result.Nodes.getNodeAs<NestedNameSpecifier>("nns")) {
if (const auto *AliasDecl = NestedName->getAsNamespaceAlias()) {
FoundDecls[AliasDecl] = CharSourceRange();
}
}
}
void UnusedAliasDeclsCheck::onEndOfTranslationUnit() {
for (const auto &FoundDecl : FoundDecls) {
if (!FoundDecl.second.isValid())
continue;
diag(FoundDecl.first->getLocation(), "this namespace alias decl is unused")
<< FixItHint::CreateRemoval(FoundDecl.second);
}
}
} // namespace tidy
} // namespace clang
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