1 //===--- InefficientVectorOperationCheck.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_INEFFICIENT_VECTOR_OPERATION_H
10 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_INEFFICIENT_VECTOR_OPERATION_H
11 
12 #include "../ClangTidyCheck.h"
13 
14 namespace clang {
15 namespace tidy {
16 namespace performance {
17 
18 /// Finds possible inefficient `std::vector` operations (e.g. `push_back`) in
19 /// for loops that may cause unnecessary memory reallocations.
20 ///
21 /// When EnableProto, also finds calls that add element to protobuf repeated
22 /// field without calling Reserve() first.
23 ///
24 /// For the user-facing documentation see:
25 /// http://clang.llvm.org/extra/clang-tidy/checks/performance-inefficient-vector-operation.html
26 class InefficientVectorOperationCheck : public ClangTidyCheck {
27 public:
28   InefficientVectorOperationCheck(StringRef Name, ClangTidyContext *Context);
isLanguageVersionSupported(const LangOptions & LangOpts)29   bool isLanguageVersionSupported(const LangOptions &LangOpts) const override{
30     return LangOpts.CPlusPlus;
31   }
32   void registerMatchers(ast_matchers::MatchFinder *Finder) override;
33   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
34   void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
35 
36 private:
37   void AddMatcher(const ast_matchers::DeclarationMatcher &TargetRecordDecl,
38                   StringRef VarDeclName, StringRef VarDeclStmtName,
39                   const ast_matchers::DeclarationMatcher &AppendMethodDecl,
40                   StringRef AppendCallName, ast_matchers::MatchFinder *Finder);
41   const std::vector<std::string> VectorLikeClasses;
42 
43   // If true, also check inefficient operations for proto repeated fields.
44   bool EnableProto;
45 };
46 
47 } // namespace performance
48 } // namespace tidy
49 } // namespace clang
50 
51 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_INEFFICIENT_VECTOR_OPERATION_H
52