clang-tools-extra/clang-tidy/modernize/RedundantVoidArgCheck.h

   1 //===--- RedundantVoidArgCheck.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_MODERNIZE_REDUNDANT_VOID_ARG_CHECK_H
  10 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_REDUNDANT_VOID_ARG_CHECK_H
  11
  12 #include "../ClangTidyCheck.h"
  13 #include "clang/Lex/Token.h"
  14
  15 #include <string>
  16
  17 namespace clang::tidy::modernize {
  18
  19 /// Find and remove redundant void argument lists.
  20 ///
  21 /// Examples:
  22 ///   `int f(void);`                    becomes `int f();`
  23 ///   `int (*f(void))(void);`           becomes `int (*f())();`
  24 ///   `typedef int (*f_t(void))(void);` becomes `typedef int (*f_t())();`
  25 ///   `void (C::*p)(void);`             becomes `void (C::*p)();`
  26 ///   `C::C(void) {}`                   becomes `C::C() {}`
  27 ///   `C::~C(void) {}`                  becomes `C::~C() {}`
  28 ///
  29 class RedundantVoidArgCheck : public ClangTidyCheck {
  30 public:
  31   RedundantVoidArgCheck(StringRef Name, ClangTidyContext *Context)
  32       : ClangTidyCheck(Name, Context) {}
  33
  34   bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
  35     return LangOpts.CPlusPlus;
  36   }
  37
  38   void registerMatchers(ast_matchers::MatchFinder *Finder) override;
  39
  40   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
  41
  42 private:
  43   void processFunctionDecl(const ast_matchers::MatchFinder::MatchResult &Result,
  44                            const FunctionDecl *Function);
  45
  46   void
  47   processTypedefNameDecl(const ast_matchers::MatchFinder::MatchResult &Result,
  48                          const TypedefNameDecl *Typedef);
  49
  50   void processFieldDecl(const ast_matchers::MatchFinder::MatchResult &Result,
  51                         const FieldDecl *Member);
  52
  53   void processVarDecl(const ast_matchers::MatchFinder::MatchResult &Result,
  54                       const VarDecl *Var);
  55
  56   void
  57   processNamedCastExpr(const ast_matchers::MatchFinder::MatchResult &Result,
  58                        const CXXNamedCastExpr *NamedCast);
  59
  60   void
  61   processExplicitCastExpr(const ast_matchers::MatchFinder::MatchResult &Result,
  62                           const ExplicitCastExpr *ExplicitCast);
  63
  64   void processLambdaExpr(const ast_matchers::MatchFinder::MatchResult &Result,
  65                          const LambdaExpr *Lambda);
  66
  67   void
  68   removeVoidArgumentTokens(const ast_matchers::MatchFinder::MatchResult &Result,
  69                            SourceRange Range, StringRef GrammarLocation);
  70
  71   void removeVoidToken(Token VoidToken, StringRef Diagnostic);
  72 };
  73
  74 } // namespace clang::tidy::modernize
  75
  76 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_REDUNDANT_VOID_ARG_CHECK_H