| 1 | //===--- ProTypeStaticCastDowncastCheck.cpp - clang-tidy-------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "ProTypeStaticCastDowncastCheck.h" |
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| 10 | #include "clang/AST/ASTContext.h" |
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| 11 | #include "clang/ASTMatchers/ASTMatchFinder.h" |
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| 12 | |
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| 13 | using namespace clang::ast_matchers; |
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| 14 | |
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| 15 | namespace clang::tidy::cppcoreguidelines { |
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| 16 | |
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| 17 | ProTypeStaticCastDowncastCheck::ProTypeStaticCastDowncastCheck( |
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| 18 | StringRef Name, ClangTidyContext *Context) |
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| 19 | : ClangTidyCheck(Name, Context), |
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| 20 | StrictMode(Options.getLocalOrGlobal(LocalName: "StrictMode" , Default: true)) {} |
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| 21 | |
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| 22 | void ProTypeStaticCastDowncastCheck::storeOptions( |
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| 23 | ClangTidyOptions::OptionMap &Opts) { |
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| 24 | Options.store(Options&: Opts, LocalName: "StrictMode" , Value: StrictMode); |
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| 25 | } |
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| 26 | |
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| 27 | void ProTypeStaticCastDowncastCheck::registerMatchers(MatchFinder *Finder) { |
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| 28 | Finder->addMatcher( |
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| 29 | NodeMatch: cxxStaticCastExpr(hasCastKind(Kind: CK_BaseToDerived)).bind(ID: "cast" ), Action: this); |
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| 30 | } |
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| 31 | |
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| 32 | void ProTypeStaticCastDowncastCheck::check( |
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| 33 | const MatchFinder::MatchResult &Result) { |
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| 34 | const auto *MatchedCast = Result.Nodes.getNodeAs<CXXStaticCastExpr>(ID: "cast" ); |
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| 35 | |
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| 36 | QualType SourceType = MatchedCast->getSubExpr()->getType(); |
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| 37 | const auto *SourceDecl = SourceType->getPointeeCXXRecordDecl(); |
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| 38 | if (!SourceDecl) // The cast is from object to reference |
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| 39 | SourceDecl = SourceType->getAsCXXRecordDecl(); |
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| 40 | if (!SourceDecl) |
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| 41 | return; |
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| 42 | |
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| 43 | if (SourceDecl->isPolymorphic()) { |
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| 44 | diag(MatchedCast->getOperatorLoc(), |
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| 45 | "do not use static_cast to downcast from a base to a derived class; " |
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| 46 | "use dynamic_cast instead" ) |
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| 47 | << FixItHint::CreateReplacement(MatchedCast->getOperatorLoc(), |
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| 48 | "dynamic_cast" ); |
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| 49 | return; |
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| 50 | } |
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| 51 | |
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| 52 | if (!StrictMode) |
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| 53 | return; |
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| 54 | |
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| 55 | diag(MatchedCast->getOperatorLoc(), |
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| 56 | "do not use static_cast to downcast from a base to a derived class" ); |
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| 57 | } |
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| 58 | |
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| 59 | } // namespace clang::tidy::cppcoreguidelines |
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| 60 | |
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