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