clang-tools-extra/clang-tidy/performance/MoveConstArgCheck.h

   1 //===--- MoveConstArgCheck.h - clang-tidy -------------------------===//
   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_MOVECONSTANTARGUMENTCHECK_H
  10 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_MOVECONSTANTARGUMENTCHECK_H
  11
  12 #include "../ClangTidyCheck.h"
  13 #include "llvm/ADT/DenseSet.h"
  14
  15 namespace clang::tidy::performance {
  16
  17 /// Find casts of calculation results to bigger type. Typically from int to
  18 ///
  19 /// The options are
  20 ///
  21 ///   - `CheckTriviallyCopyableMove`: Whether to check for trivially-copyable
  22 //      types as their objects are not moved but copied. Enabled by default.
  23 //    - `CheckMoveToConstRef`: Whether to check if a `std::move()` is passed
  24 //      as a const reference argument.
  25 class MoveConstArgCheck : public ClangTidyCheck {
  26 public:
  27   MoveConstArgCheck(StringRef Name, ClangTidyContext *Context)
  28       : ClangTidyCheck(Name, Context), CheckTriviallyCopyableMove(Options.get(
  29                                            "CheckTriviallyCopyableMove", true)),
  30         CheckMoveToConstRef(Options.get("CheckMoveToConstRef", true)) {}
  31   bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
  32     return LangOpts.CPlusPlus;
  33   }
  34   void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
  35   void registerMatchers(ast_matchers::MatchFinder *Finder) override;
  36   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
  37
  38 private:
  39   const bool CheckTriviallyCopyableMove;
  40   const bool CheckMoveToConstRef;
  41   llvm::DenseSet<const CallExpr *> AlreadyCheckedMoves;
  42 };
  43
  44 } // namespace clang::tidy::performance
  45
  46 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_MOVECONSTANTARGUMENTCHECK_H