clang-tools  4.0.0
UnusedUsingDeclsCheck.h
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1 //===--- UnusedUsingDeclsCheck.h - clang-tidy--------------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_USING_DECLS_H
11 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_USING_DECLS_H
12 
13 #include "../ClangTidy.h"
14 #include "llvm/ADT/SmallPtrSet.h"
15 #include <vector>
16 
17 namespace clang {
18 namespace tidy {
19 namespace misc {
20 
21 /// Finds unused using declarations.
22 ///
23 /// For the user-facing documentation see:
24 /// http://clang.llvm.org/extra/clang-tidy/checks/misc-unused-using-decls.html
26 public:
28  : ClangTidyCheck(Name, Context) {}
29  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
30  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
31  void onEndOfTranslationUnit() override;
32 
33 private:
34  void removeFromFoundDecls(const Decl *D);
35 
36  struct UsingDeclContext {
37  explicit UsingDeclContext(const UsingDecl *FoundUsingDecl)
38  : FoundUsingDecl(FoundUsingDecl), IsUsed(false) {}
39  // A set saves all UsingShadowDecls introduced by a UsingDecl. A UsingDecl
40  // can introduce multiple UsingShadowDecls in some cases (such as
41  // overloaded functions).
42  llvm::SmallPtrSet<const Decl *, 4> UsingTargetDecls;
43  // The original UsingDecl.
44  const UsingDecl *FoundUsingDecl;
45  // The source range of the UsingDecl.
46  CharSourceRange UsingDeclRange;
47  // Whether the UsingDecl is used.
48  bool IsUsed;
49  };
50 
51  std::vector<UsingDeclContext> Contexts;
52 };
53 
54 } // namespace misc
55 } // namespace tidy
56 } // namespace clang
57 
58 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_USING_DECLS_H
const std::string Name
Definition: USRFinder.cpp:164
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.
std::unique_ptr< ast_matchers::MatchFinder > Finder
Definition: ClangTidy.cpp:262
UnusedUsingDeclsCheck(StringRef Name, ClangTidyContext *Context)
Base class for all clang-tidy checks.
Definition: ClangTidy.h:127
Finds unused using declarations.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
Every ClangTidyCheck reports errors through a DiagnosticsEngine provided by this context.
const NamedDecl * Result
Definition: USRFinder.cpp:162