59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
//===--- UnusedAliasDeclsCheck.cpp - clang-tidy----------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "UnusedAliasDeclsCheck.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/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 misc {
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void UnusedAliasDeclsCheck::registerMatchers(MatchFinder *Finder) {
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// We cannot do anything about headers (yet), as the alias declarations
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// used in one header could be used by some other translation unit.
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Finder->addMatcher(namespaceAliasDecl(isExpansionInMainFile()).bind("alias"),
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this);
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Finder->addMatcher(nestedNameSpecifier().bind("nns"), this);
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}
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void UnusedAliasDeclsCheck::check(const MatchFinder::MatchResult &Result) {
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if (const auto *AliasDecl = Result.Nodes.getNodeAs<NamedDecl>("alias")) {
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FoundDecls[AliasDecl] = CharSourceRange::getCharRange(
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AliasDecl->getBeginLoc(),
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Lexer::findLocationAfterToken(
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AliasDecl->getEndLoc(), tok::semi, *Result.SourceManager,
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getLangOpts(),
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/*SkipTrailingWhitespaceAndNewLine=*/true));
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return;
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}
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if (const auto *NestedName =
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Result.Nodes.getNodeAs<NestedNameSpecifier>("nns")) {
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if (const auto *AliasDecl = NestedName->getAsNamespaceAlias()) {
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FoundDecls[AliasDecl] = CharSourceRange();
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}
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}
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}
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void UnusedAliasDeclsCheck::onEndOfTranslationUnit() {
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for (const auto &FoundDecl : FoundDecls) {
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if (!FoundDecl.second.isValid())
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continue;
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diag(FoundDecl.first->getLocation(), "namespace alias decl %0 is unused")
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<< FoundDecl.first << FixItHint::CreateRemoval(FoundDecl.second);
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}
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}
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} // namespace misc
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} // namespace tidy
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} // namespace clang
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