clang-tools  10.0.0svn
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 "llvm/ADT/SmallPtrSet.h"
14 #include <vector>
15 
16 namespace clang {
17 namespace tidy {
18 namespace misc {
19 
20 /// Finds unused using declarations.
21 ///
22 /// For the user-facing documentation see:
23 /// http://clang.llvm.org/extra/clang-tidy/checks/misc-unused-using-decls.html
25 public:
27  : ClangTidyCheck(Name, Context) {}
28  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
29  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
30  void onEndOfTranslationUnit() override;
31 
32 private:
33  void removeFromFoundDecls(const Decl *D);
34 
35  struct UsingDeclContext {
36  explicit UsingDeclContext(const UsingDecl *FoundUsingDecl)
37  : FoundUsingDecl(FoundUsingDecl), IsUsed(false) {}
38  // A set saves all UsingShadowDecls introduced by a UsingDecl. A UsingDecl
39  // can introduce multiple UsingShadowDecls in some cases (such as
40  // overloaded functions).
41  llvm::SmallPtrSet<const Decl *, 4> UsingTargetDecls;
42  // The original UsingDecl.
43  const UsingDecl *FoundUsingDecl;
44  // The source range of the UsingDecl.
45  CharSourceRange UsingDeclRange;
46  // Whether the UsingDecl is used.
47  bool IsUsed;
48  };
49 
50  std::vector<UsingDeclContext> Contexts;
51 };
52 
53 } // namespace misc
54 } // namespace tidy
55 } // namespace clang
56 
57 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_USING_DECLS_H
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.
UnusedUsingDeclsCheck(StringRef Name, ClangTidyContext *Context)
Base class for all clang-tidy checks.
Finds unused using declarations.
static constexpr llvm::StringLiteral Name
const Decl * D
Definition: XRefs.cpp:849
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Every ClangTidyCheck reports errors through a DiagnosticsEngine provided by this context.