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58 lines
1.9 KiB
58 lines
1.9 KiB
7 months ago
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//===--- UnusedUsingDeclsCheck.h - clang-tidy--------------------*- C++ -*-===//
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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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#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_USING_DECLS_H
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#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_USING_DECLS_H
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#include "../ClangTidyCheck.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include <vector>
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namespace clang {
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namespace tidy {
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namespace misc {
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/// Finds unused using declarations.
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///
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/// For the user-facing documentation see:
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/// http://clang.llvm.org/extra/clang-tidy/checks/misc-unused-using-decls.html
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class UnusedUsingDeclsCheck : public ClangTidyCheck {
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public:
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UnusedUsingDeclsCheck(StringRef Name, ClangTidyContext *Context)
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: ClangTidyCheck(Name, Context) {}
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void registerMatchers(ast_matchers::MatchFinder *Finder) override;
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void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
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void onEndOfTranslationUnit() override;
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private:
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void removeFromFoundDecls(const Decl *D);
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struct UsingDeclContext {
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explicit UsingDeclContext(const UsingDecl *FoundUsingDecl)
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: FoundUsingDecl(FoundUsingDecl), IsUsed(false) {}
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// A set saves all UsingShadowDecls introduced by a UsingDecl. A UsingDecl
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// can introduce multiple UsingShadowDecls in some cases (such as
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// overloaded functions).
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llvm::SmallPtrSet<const Decl *, 4> UsingTargetDecls;
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// The original UsingDecl.
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const UsingDecl *FoundUsingDecl;
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// The source range of the UsingDecl.
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CharSourceRange UsingDeclRange;
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// Whether the UsingDecl is used.
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bool IsUsed;
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};
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std::vector<UsingDeclContext> Contexts;
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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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#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_USING_DECLS_H
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