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