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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 {
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16 namespace tidy {
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17 namespace hicpp {
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18
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19 void ExceptionBaseclassCheck::registerMatchers(MatchFinder *Finder) {
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20 if (!getLangOpts().CPlusPlus)
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21 return;
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22
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23 Finder->addMatcher(
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24 cxxThrowExpr(
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25 unless(has(expr(anyOf(isTypeDependent(), isValueDependent())))),
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26 // The thrown value is not derived from 'std::exception'.
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27 has(expr(unless(
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28 hasType(qualType(hasCanonicalType(hasDeclaration(cxxRecordDecl(
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29 isSameOrDerivedFrom(hasName("::std::exception")))))))))),
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30 // This condition is always true, but will bind to the
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31 // template value if the thrown type is templated.
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32 anyOf(has(expr(
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33 hasType(substTemplateTypeParmType().bind("templ_type")))),
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34 anything()),
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35 // Bind to the declaration of the type of the value that
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36 // is thrown. 'anything()' is necessary to always suceed
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37 // in the 'eachOf' because builtin types are not
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38 // 'namedDecl'.
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39 eachOf(has(expr(hasType(namedDecl().bind("decl")))), anything()))
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40 .bind("bad_throw"),
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41 this);
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42 }
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43
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44 void ExceptionBaseclassCheck::check(const MatchFinder::MatchResult &Result) {
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45 const auto *BadThrow = Result.Nodes.getNodeAs<CXXThrowExpr>("bad_throw");
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46 assert(BadThrow && "Did not match the throw expression");
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47
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48 diag(BadThrow->getSubExpr()->getBeginLoc(), "throwing an exception whose "
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49 "type %0 is not derived from "
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50 "'std::exception'")
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51 << BadThrow->getSubExpr()->getType() << BadThrow->getSourceRange();
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52
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53 if (const auto *Template =
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54 Result.Nodes.getNodeAs<SubstTemplateTypeParmType>("templ_type"))
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55 diag(BadThrow->getSubExpr()->getBeginLoc(),
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56 "type %0 is a template instantiation of %1", DiagnosticIDs::Note)
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57 << BadThrow->getSubExpr()->getType()
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58 << Template->getReplacedParameter()->getDecl();
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59
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60 if (const auto *TypeDecl = Result.Nodes.getNodeAs<NamedDecl>("decl"))
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61 diag(TypeDecl->getBeginLoc(), "type defined here", DiagnosticIDs::Note);
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62 }
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63
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64 } // namespace hicpp
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65 } // namespace tidy
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66 } // namespace clang
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