| 1 | //===--- ExceptionBaseclassCheck.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 "ExceptionBaseclassCheck.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::hicpp { |
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| 16 | |
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| 17 | void ExceptionBaseclassCheck::registerMatchers(MatchFinder *Finder) { |
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| 18 | Finder->addMatcher( |
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| 19 | NodeMatch: cxxThrowExpr( |
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| 20 | unless(has(expr(anyOf(isTypeDependent(), isValueDependent())))), |
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| 21 | // The thrown value is not derived from 'std::exception'. |
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| 22 | has(expr(unless( |
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| 23 | hasType(InnerMatcher: qualType(hasCanonicalType(InnerMatcher: hasDeclaration(InnerMatcher: cxxRecordDecl( |
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| 24 | isSameOrDerivedFrom(Base: hasName(Name: "::std::exception" )))))))))), |
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| 25 | // This condition is always true, but will bind to the |
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| 26 | // template value if the thrown type is templated. |
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| 27 | anyOf(has(expr( |
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| 28 | hasType(InnerMatcher: substTemplateTypeParmType().bind(ID: "templ_type" )))), |
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| 29 | anything()), |
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| 30 | // Bind to the declaration of the type of the value that |
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| 31 | // is thrown. 'anything()' is necessary to always succeed |
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| 32 | // in the 'eachOf' because builtin types are not |
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| 33 | // 'namedDecl'. |
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| 34 | eachOf(has(expr(hasType(InnerMatcher: namedDecl().bind(ID: "decl" )))), anything())) |
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| 35 | .bind(ID: "bad_throw" ), |
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| 36 | Action: this); |
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| 37 | } |
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| 38 | |
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| 39 | void ExceptionBaseclassCheck::check(const MatchFinder::MatchResult &Result) { |
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| 40 | const auto *BadThrow = Result.Nodes.getNodeAs<CXXThrowExpr>(ID: "bad_throw" ); |
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| 41 | assert(BadThrow && "Did not match the throw expression" ); |
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| 42 | |
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| 43 | diag(BadThrow->getSubExpr()->getBeginLoc(), "throwing an exception whose " |
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| 44 | "type %0 is not derived from " |
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| 45 | "'std::exception'" ) |
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| 46 | << BadThrow->getSubExpr()->getType() << BadThrow->getSourceRange(); |
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| 47 | |
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| 48 | if (const auto *Template = |
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| 49 | Result.Nodes.getNodeAs<SubstTemplateTypeParmType>(ID: "templ_type" )) |
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| 50 | diag(BadThrow->getSubExpr()->getBeginLoc(), |
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| 51 | "type %0 is a template instantiation of %1" , DiagnosticIDs::Note) |
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| 52 | << BadThrow->getSubExpr()->getType() |
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| 53 | << Template->getReplacedParameter(); |
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| 54 | |
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| 55 | if (const auto *TypeDecl = Result.Nodes.getNodeAs<NamedDecl>(ID: "decl" )) |
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| 56 | diag(TypeDecl->getBeginLoc(), "type defined here" , DiagnosticIDs::Note); |
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| 57 | } |
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| 58 | |
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| 59 | } // namespace clang::tidy::hicpp |
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| 60 | |
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