1 //===--- UnnecessaryCopyInitialization.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_PERFORMANCE_UNNECESSARY_COPY_INITIALIZATION_H 10 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_UNNECESSARY_COPY_INITIALIZATION_H 11 12 #include "../ClangTidyCheck.h" 13 14 namespace clang { 15 namespace tidy { 16 namespace performance { 17 18 // The check detects local variable declarations that are copy initialized with 19 // the const reference of a function call or the const reference of a method 20 // call whose object is guaranteed to outlive the variable's scope and suggests 21 // to use a const reference. 22 // 23 // The check currently only understands a subset of variables that are 24 // guaranteed to outlive the const reference returned, namely: const variables, 25 // const references, and const pointers to const. 26 class UnnecessaryCopyInitialization : public ClangTidyCheck { 27 public: 28 UnnecessaryCopyInitialization(StringRef Name, ClangTidyContext *Context); 29 void registerMatchers(ast_matchers::MatchFinder *Finder) override; 30 void check(const ast_matchers::MatchFinder::MatchResult &Result) override; 31 void storeOptions(ClangTidyOptions::OptionMap &Opts) override; 32 33 private: 34 void handleCopyFromMethodReturn(const VarDecl &Var, const Stmt &BlockStmt, 35 bool IssueFix, const VarDecl *ObjectArg, 36 ASTContext &Context); 37 void handleCopyFromLocalVar(const VarDecl &NewVar, const VarDecl &OldVar, 38 const Stmt &BlockStmt, bool IssueFix, 39 ASTContext &Context); 40 const std::vector<std::string> AllowedTypes; 41 }; 42 43 } // namespace performance 44 } // namespace tidy 45 } // namespace clang 46 47 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_UNNECESSARY_COPY_INITIALIZATION_H 48