dd969ad6e0
Change-Id: Ie283a4774564f25e0fde8ca35212f92be786d671 Reviewed-on: https://gerrit.libreoffice.org/75785 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
138 lines
3.5 KiB
C++
138 lines
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef LO_CLANG_SHARED_PLUGINS
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#include <algorithm>
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#include "clang/AST/Attr.h"
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#include "clang/AST/CXXInheritance.h"
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#include "plugin.hxx"
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namespace {
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// cf. Clang's clang::AST::CXXDynamicCastExpr::isAlwaysNull
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// (lib/AST/ExprCXX.cpp):
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bool isAlwaysNull(CXXDynamicCastExpr const * expr) {
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QualType SrcType = expr->getSubExpr()->getType();
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QualType DestType = expr->getType();
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if (const clang::PointerType *SrcPTy = SrcType->getAs<clang::PointerType>()) {
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SrcType = SrcPTy->getPointeeType();
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#if 0
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DestType = DestType->castAs<PointerType>()->getPointeeType();
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#else
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auto DstPTy = DestType->getAs<clang::PointerType>();
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if (!DstPTy)
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return false;
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DestType = DstPTy->getPointeeType();
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#endif
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}
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if (DestType->isVoidType())
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return false;
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#if 0
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const CXXRecordDecl *SrcRD =
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cast<CXXRecordDecl>(SrcType->castAs<RecordType>()->getDecl());
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#else
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auto SrcRT = SrcType->getAs<RecordType>();
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if (!SrcRT)
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return false;
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const CXXRecordDecl *SrcRD = cast<CXXRecordDecl>(SrcRT->getDecl());
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#endif
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#if 0
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if (!SrcRD->hasAttr<FinalAttr>())
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return false;
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#endif
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#if 0
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const CXXRecordDecl *DestRD =
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cast<CXXRecordDecl>(DestType->castAs<RecordType>()->getDecl());
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#else
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auto DestRT = DestType->getAs<RecordType>();
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if (!DestRT)
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return false;
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const CXXRecordDecl *DestRD = cast<CXXRecordDecl>(DestRT->getDecl());
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#endif
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#if 1
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if (!(SrcRD && DestRD))
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return false;
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if (DestRD->hasAttr<FinalAttr>()) {
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CXXBasePaths Paths(/*FindAmbiguities=*/false, /*RecordPaths=*/true,
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/*DetectVirtual=*/false);
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if (DestRD->isDerivedFrom(SrcRD, Paths) &&
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std::all_of(Paths.begin(), Paths.end(),
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[](CXXBasePath const & Path) {
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return Path.Access != AS_public; }))
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return true;
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}
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if (!SrcRD->hasAttr<FinalAttr>())
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return false;
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#endif
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#if 0
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return !DestRD->isDerivedFrom(SrcRD);
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#else
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return !(DestRD->isDerivedFrom(SrcRD)
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|| SrcRD->isDerivedFrom(DestRD)
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|| SrcRD == DestRD);
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#endif
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}
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class FailedDynCast:
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public loplugin::FilteringPlugin<FailedDynCast>
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{
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public:
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explicit FailedDynCast(loplugin::InstantiationData const & data):
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FilteringPlugin(data) {}
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bool shouldVisitTemplateInstantiations() const { return true; }
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bool preRun() override;
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void run() override;
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bool VisitCXXDynamicCastExpr(CXXDynamicCastExpr const * expr);
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};
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bool FailedDynCast::preRun() {
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return compiler.getLangOpts().CPlusPlus;
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}
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void FailedDynCast::run() {
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if (preRun()) {
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TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
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}
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}
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bool FailedDynCast::VisitCXXDynamicCastExpr(CXXDynamicCastExpr const * expr) {
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if (ignoreLocation(expr)) {
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return true;
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}
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if (isAlwaysNull(expr)) {
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report(
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DiagnosticsEngine::Warning,
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"dynamic_cast from %0 to %1 always fails", compat::getBeginLoc(expr))
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<< expr->getSubExpr()->getType() << expr->getType()
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<< expr->getSourceRange();
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}
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return true;
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}
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loplugin::Plugin::Registration<FailedDynCast> faileddyncast("faileddyncast");
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} // namespace
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#endif // LO_CLANG_SHARED_PLUGINS
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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