Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]>, Endre =?utf-8?q?Fülöp?= <[email protected]> Message-ID: In-Reply-To: <llvm.org/llvm/llvm-project/pull/[email protected]>
================ @@ -0,0 +1,171 @@ +//===----------------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ExpensiveValueOrCheck.h" +#include "../utils/Matchers.h" +#include "../utils/OptionsUtils.h" +#include "../utils/TypeTraits.h" +#include "clang/AST/ASTContext.h" +#include "clang/ASTMatchers/ASTMatchFinder.h" +#include "clang/Tooling/FixIt.h" + +using namespace clang::ast_matchers; + +namespace clang::tidy::performance { + +static bool hasOperatorStar(const CXXRecordDecl *RD) { + const DeclarationName OpStar = + RD->getASTContext().DeclarationNames.getCXXOperatorName(OO_Star); + return !RD->lookup(OpStar).empty(); +} + +static StringRef findValueMethod(const CXXRecordDecl *RD) { + ASTContext &Ctx = RD->getASTContext(); + for (StringRef Name : {"value", "Value"}) { + const DeclarationName DN = &Ctx.Idents.get(Name); + if (!RD->lookup(DN).empty()) + return Name; + } + return {}; +} + +static std::string buildSuggestion(const CXXRecordDecl *OptionalClass) { + const bool HasDeref = hasOperatorStar(OptionalClass); + StringRef ValueName = findValueMethod(OptionalClass); + + if (HasDeref && !ValueName.empty()) + return (llvm::Twine("consider using 'operator*' or '") + ValueName + + "()' with a separate fallback") + .str(); + if (HasDeref) + return "consider using 'operator*' with a separate fallback"; + if (!ValueName.empty()) + return (llvm::Twine("consider using '") + ValueName + + "()' with a separate fallback") + .str(); + return "consider avoiding the copy"; +} + +static std::optional<FixItHint> buildFixIt(const CXXMemberCallExpr *Call, + const Expr *ObjExpr, + const Expr *FallbackArg, + const CXXRecordDecl *OptionalClass, + const ASTContext &Ctx) { + if (Call->getBeginLoc().isMacroID()) + return std::nullopt; + if (!ObjExpr->isLValue()) + return std::nullopt; + if (!hasOperatorStar(OptionalClass)) + return std::nullopt; + + StringRef ObjText = tooling::fixit::getText(*ObjExpr, Ctx); + StringRef ArgText = tooling::fixit::getText(*FallbackArg, Ctx); + + if (ObjText.empty() || ArgText.empty()) + return std::nullopt; + + const std::string Replacement = + ("(" + ObjText + " ? *" + ObjText + " : " + ArgText + ")").str(); + return FixItHint::CreateReplacement(Call->getSourceRange(), Replacement); +} + +ExpensiveValueOrCheck::ExpensiveValueOrCheck(StringRef Name, + ClangTidyContext *Context) + : ClangTidyCheck(Name, Context), + SizeThreshold(Options.get("SizeThreshold", 16U)), + OptionalTypes(utils::options::parseStringList( + Options.get("OptionalTypes", + "::std::optional;::absl::optional;::boost::optional"))), + WarnOnOwnershipTaking(Options.get("WarnOnOwnershipTaking", false)) {} + +void ExpensiveValueOrCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) { + Options.store(Opts, "SizeThreshold", SizeThreshold); + Options.store(Opts, "OptionalTypes", + utils::options::serializeStringList(OptionalTypes)); + Options.store(Opts, "WarnOnOwnershipTaking", WarnOnOwnershipTaking); +} + +void ExpensiveValueOrCheck::registerMatchers(MatchFinder *Finder) { + auto OptionalTypesMatcher = + matchers::matchesAnyListedRegexName(OptionalTypes); + auto ValueOrMatcher = hasAnyName("value_or", "valueOr", "ValueOr"); + auto ValueOrCall = cxxMemberCallExpr( + callee(cxxMethodDecl(ValueOrMatcher, ofClass(OptionalTypesMatcher)))); + + if (WarnOnOwnershipTaking) { + Finder->addMatcher(ValueOrCall.bind("call"), this); ---------------- zwuis wrote: Please exclude expressions in unevaluated context such as `decltype` and `sizeof`. https://github.com/llvm/llvm-project/pull/200166 _______________________________________________ cfe-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
