64 lines
2.6 KiB
C++
64 lines
2.6 KiB
C++
//===--- ExceptionBaseclassCheck.cpp - clang-tidy--------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "ExceptionBaseclassCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace hicpp {
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void ExceptionBaseclassCheck::registerMatchers(MatchFinder *Finder) {
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Finder->addMatcher(
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cxxThrowExpr(
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unless(has(expr(anyOf(isTypeDependent(), isValueDependent())))),
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// The thrown value is not derived from 'std::exception'.
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has(expr(unless(
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hasType(qualType(hasCanonicalType(hasDeclaration(cxxRecordDecl(
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isSameOrDerivedFrom(hasName("::std::exception")))))))))),
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// This condition is always true, but will bind to the
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// template value if the thrown type is templated.
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anyOf(has(expr(
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hasType(substTemplateTypeParmType().bind("templ_type")))),
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anything()),
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// Bind to the declaration of the type of the value that
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// is thrown. 'anything()' is necessary to always succeed
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// in the 'eachOf' because builtin types are not
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// 'namedDecl'.
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eachOf(has(expr(hasType(namedDecl().bind("decl")))), anything()))
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.bind("bad_throw"),
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this);
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}
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void ExceptionBaseclassCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *BadThrow = Result.Nodes.getNodeAs<CXXThrowExpr>("bad_throw");
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assert(BadThrow && "Did not match the throw expression");
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diag(BadThrow->getSubExpr()->getBeginLoc(), "throwing an exception whose "
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"type %0 is not derived from "
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"'std::exception'")
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<< BadThrow->getSubExpr()->getType() << BadThrow->getSourceRange();
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if (const auto *Template =
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Result.Nodes.getNodeAs<SubstTemplateTypeParmType>("templ_type"))
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diag(BadThrow->getSubExpr()->getBeginLoc(),
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"type %0 is a template instantiation of %1", DiagnosticIDs::Note)
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<< BadThrow->getSubExpr()->getType()
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<< Template->getReplacedParameter()->getDecl();
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if (const auto *TypeDecl = Result.Nodes.getNodeAs<NamedDecl>("decl"))
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diag(TypeDecl->getBeginLoc(), "type defined here", DiagnosticIDs::Note);
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}
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} // namespace hicpp
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} // namespace tidy
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} // namespace clang
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