clang-tools 17.0.0git
UnusedUsingDeclsCheck.h
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1//===--- UnusedUsingDeclsCheck.h - clang-tidy--------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_USING_DECLS_H
10#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_USING_DECLS_H
11
12#include "../ClangTidyCheck.h"
13#include "../utils/FileExtensionsUtils.h"
14#include "llvm/ADT/SmallPtrSet.h"
15#include <vector>
16
17namespace clang::tidy::misc {
18
19/// Finds unused using declarations.
20///
21/// For the user-facing documentation see:
22/// http://clang.llvm.org/extra/clang-tidy/checks/misc/unused-using-decls.html
24public:
25 UnusedUsingDeclsCheck(StringRef Name, ClangTidyContext *Context);
26 void registerMatchers(ast_matchers::MatchFinder *Finder) override;
27 void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
28 void onEndOfTranslationUnit() override;
29
30private:
31 void removeFromFoundDecls(const Decl *D);
32
33 struct UsingDeclContext {
34 explicit UsingDeclContext(const UsingDecl *FoundUsingDecl)
35 : FoundUsingDecl(FoundUsingDecl), IsUsed(false) {}
36 // A set saves all UsingShadowDecls introduced by a UsingDecl. A UsingDecl
37 // can introduce multiple UsingShadowDecls in some cases (such as
38 // overloaded functions).
39 llvm::SmallPtrSet<const Decl *, 4> UsingTargetDecls;
40 // The original UsingDecl.
41 const UsingDecl *FoundUsingDecl;
42 // The source range of the UsingDecl.
43 CharSourceRange UsingDeclRange;
44 // Whether the UsingDecl is used.
45 bool IsUsed;
46 };
47
48 std::vector<UsingDeclContext> Contexts;
49
50 const StringRef RawStringHeaderFileExtensions;
51 utils::FileExtensionsSet HeaderFileExtensions;
52};
53
54} // namespace clang::tidy::misc
55
56#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_USING_DECLS_H
bool IsUsed
const FunctionDecl * Decl
Token Name
Base class for all clang-tidy checks.
Every ClangTidyCheck reports errors through a DiagnosticsEngine provided by this context.
Finds unused using declarations.
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
llvm::SmallSet< llvm::StringRef, 5 > FileExtensionsSet