| 1 | //===--- UnusedAliasDeclsCheck.cpp - clang-tidy----------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "UnusedAliasDeclsCheck.h" |
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| 10 | #include "clang/AST/ASTContext.h" |
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| 11 | #include "clang/ASTMatchers/ASTMatchFinder.h" |
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| 12 | #include "clang/Lex/Lexer.h" |
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| 13 | |
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| 14 | using namespace clang::ast_matchers; |
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| 15 | |
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| 16 | namespace clang::tidy::misc { |
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| 17 | |
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| 18 | void UnusedAliasDeclsCheck::registerMatchers(MatchFinder *Finder) { |
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| 19 | // We cannot do anything about headers (yet), as the alias declarations |
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| 20 | // used in one header could be used by some other translation unit. |
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| 21 | Finder->addMatcher(NodeMatch: namespaceAliasDecl(isExpansionInMainFile()).bind(ID: "alias" ), |
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| 22 | Action: this); |
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| 23 | Finder->addMatcher(NodeMatch: nestedNameSpecifier().bind(ID: "nns" ), Action: this); |
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| 24 | } |
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| 25 | |
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| 26 | void UnusedAliasDeclsCheck::check(const MatchFinder::MatchResult &Result) { |
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| 27 | if (const auto *AliasDecl = Result.Nodes.getNodeAs<NamedDecl>(ID: "alias" )) { |
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| 28 | FoundDecls[AliasDecl] = CharSourceRange::getCharRange( |
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| 29 | AliasDecl->getBeginLoc(), |
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| 30 | Lexer::findLocationAfterToken( |
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| 31 | loc: AliasDecl->getEndLoc(), TKind: tok::semi, SM: *Result.SourceManager, |
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| 32 | LangOpts: getLangOpts(), |
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| 33 | /*SkipTrailingWhitespaceAndNewLine=*/true)); |
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| 34 | return; |
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| 35 | } |
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| 36 | |
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| 37 | if (const auto *NestedName = |
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| 38 | Result.Nodes.getNodeAs<NestedNameSpecifier>(ID: "nns" )) { |
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| 39 | if (const auto *AliasDecl = NestedName->getAsNamespaceAlias()) { |
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| 40 | FoundDecls[AliasDecl] = CharSourceRange(); |
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| 41 | } |
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| 42 | } |
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| 43 | } |
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| 44 | |
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| 45 | void UnusedAliasDeclsCheck::onEndOfTranslationUnit() { |
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| 46 | for (const auto &FoundDecl : FoundDecls) { |
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| 47 | if (!FoundDecl.second.isValid()) |
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| 48 | continue; |
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| 49 | diag(FoundDecl.first->getLocation(), "namespace alias decl %0 is unused" ) |
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| 50 | << FoundDecl.first << FixItHint::CreateRemoval(RemoveRange: FoundDecl.second); |
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| 51 | } |
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| 52 | } |
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| 53 | |
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| 54 | } // namespace clang::tidy::misc |
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| 55 | |
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