91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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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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// Find (in-)equality comparisons between typeid expressions that can never succeed. For now, just
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// detects cases where the two involved types are structurally different, one a pointer type and the
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// other a non-pointer type.
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#ifndef LO_CLANG_SHARED_PLUGINS
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#include "plugin.hxx"
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namespace
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{
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class TypeidComparison final : public loplugin::FilteringPlugin<TypeidComparison>
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{
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public:
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explicit TypeidComparison(loplugin::InstantiationData const& data)
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: FilteringPlugin(data)
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{
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}
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// For CXXRewrittenBinaryOperator `typeid(...) != typeid(...)`:
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bool shouldVisitImplicitCode() const { return true; }
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bool preRun() override { return compiler.getLangOpts().CPlusPlus; }
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void run() override
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{
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if (preRun())
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{
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TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
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}
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}
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bool VisitCXXOperatorCallExpr(CXXOperatorCallExpr const* expr)
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{
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if (ignoreLocation(expr))
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{
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return true;
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}
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auto const op = expr->getOperator();
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if (op != OO_EqualEqual && op != OO_ExclaimEqual)
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{
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return true;
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}
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assert(expr->getNumArgs() == 2);
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auto const e1 = dyn_cast<CXXTypeidExpr>(expr->getArg(0)->IgnoreParenImpCasts());
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if (e1 == nullptr)
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{
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return true;
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}
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auto const e2 = dyn_cast<CXXTypeidExpr>(expr->getArg(1)->IgnoreParenImpCasts());
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if (e2 == nullptr)
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{
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return true;
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}
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auto const t1 = getOperandType(e1);
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auto const t2 = getOperandType(e2);
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if (t1->isPointerType() == t2->isPointerType())
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{
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return true;
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}
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report(DiagnosticsEngine::Warning,
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"comparison of type info of mixed pointer and non-pointer types %0 and %1 can never "
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"succeed",
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expr->getExprLoc())
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<< t1 << t2 << expr->getSourceRange();
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return true;
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}
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private:
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QualType getOperandType(CXXTypeidExpr const* expr)
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{
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return expr->isTypeOperand() ? expr->getTypeOperand(compiler.getASTContext())
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: expr->getExprOperand()->getType();
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}
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};
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static loplugin::Plugin::Registration<TypeidComparison> typeidcomparison("typeidcomparison");
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}
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#endif
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/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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