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