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1//===----------------------------------------------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_UNNECESSARYVALUEPARAMCHECK_H10#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_UNNECESSARYVALUEPARAMCHECK_H11 12#include "../ClangTidyCheck.h"13#include "../utils/IncludeInserter.h"14#include "clang/Analysis/Analyses/ExprMutationAnalyzer.h"15 16namespace clang::tidy::performance {17 18/// A check that flags value parameters of expensive to copy types that19/// can safely be converted to const references.20///21/// For the user-facing documentation see:22/// https://clang.llvm.org/extra/clang-tidy/checks/performance/unnecessary-value-param.html23class UnnecessaryValueParamCheck : public ClangTidyCheck {24public:25 UnnecessaryValueParamCheck(StringRef Name, ClangTidyContext *Context);26 bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {27 return LangOpts.CPlusPlus;28 }29 void registerMatchers(ast_matchers::MatchFinder *Finder) override;30 void check(const ast_matchers::MatchFinder::MatchResult &Result) override;31 void registerPPCallbacks(const SourceManager &SM, Preprocessor *PP,32 Preprocessor *ModuleExpanderPP) override;33 void storeOptions(ClangTidyOptions::OptionMap &Opts) override;34 void onEndOfTranslationUnit() override;35 36protected:37 // Create diagnostics. These are virtual so that derived classes can change38 // behaviour.39 virtual void handleMoveFix(const ParmVarDecl &Param,40 const DeclRefExpr &CopyArgument,41 ASTContext &Context);42 virtual void handleConstRefFix(const FunctionDecl &Function,43 const ParmVarDecl &Param, ASTContext &Context);44 45private:46 ExprMutationAnalyzer::Memoized MutationAnalyzerCache;47 utils::IncludeInserter Inserter;48 const std::vector<StringRef> AllowedTypes;49 bool IgnoreCoroutines;50};51 52} // namespace clang::tidy::performance53 54#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_UNNECESSARYVALUEPARAMCHECK_H55