clang-tools  12.0.0git
UnnecessaryValueParamCheck.h
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1 //===--- UnnecessaryValueParamCheck.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_VALUE_PARAM_H
10 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_UNNECESSARY_VALUE_PARAM_H
11 
12 #include "../ClangTidyCheck.h"
13 #include "../utils/IncludeInserter.h"
14 #include "clang/Analysis/Analyses/ExprMutationAnalyzer.h"
15 
16 namespace clang {
17 namespace tidy {
18 namespace performance {
19 
20 /// A check that flags value parameters of expensive to copy types that
21 /// can safely be converted to const references.
22 ///
23 /// For the user-facing documentation see:
24 /// http://clang.llvm.org/extra/clang-tidy/checks/performance-unnecessary-value-param.html
26 public:
28  bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
29  return LangOpts.CPlusPlus;
30  }
31  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
32  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
33  void registerPPCallbacks(const SourceManager &SM, Preprocessor *PP,
34  Preprocessor *ModuleExpanderPP) override;
35  void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
36  void onEndOfTranslationUnit() override;
37 
38 private:
39  void handleMoveFix(const ParmVarDecl &Var, const DeclRefExpr &CopyArgument,
40  const ASTContext &Context);
41 
42  llvm::DenseMap<const FunctionDecl *, FunctionParmMutationAnalyzer>
43  MutationAnalyzers;
44  std::unique_ptr<utils::IncludeInserter> Inserter;
45  const utils::IncludeSorter::IncludeStyle IncludeStyle;
46  const std::vector<std::string> AllowedTypes;
47 };
48 
49 } // namespace performance
50 } // namespace tidy
51 } // namespace clang
52 
53 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_UNNECESSARY_VALUE_PARAM_H
IncludeStyle
Supported include styles.
Definition: IncludeSorter.h:26
bool isLanguageVersionSupported(const LangOptions &LangOpts) const override
Override this to disable registering matchers and PP callbacks if an invalid language version is bein...
void storeOptions(ClangTidyOptions::OptionMap &Opts) override
Should store all options supported by this check with their current values or default values for opti...
Base class for all clang-tidy checks.
void registerPPCallbacks(const SourceManager &SM, Preprocessor *PP, Preprocessor *ModuleExpanderPP) override
Override this to register PPCallbacks in the preprocessor.
UnnecessaryValueParamCheck(StringRef Name, ClangTidyContext *Context)
A check that flags value parameters of expensive to copy types that can safely be converted to const ...
static constexpr llvm::StringLiteral Name
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Every ClangTidyCheck reports errors through a DiagnosticsEngine provided by this context.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
std::map< std::string, ClangTidyValue > OptionMap
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.