948c9c0a31
...of measuring loplugin performance, when gathering data with perf and all plugins that used "Visitor" as class name were lumped together. (Cf. <https://whatofhow.wordpress.com/2016/06/28/plugin-flamed/>.) Change-Id: Ie482f443faced7469528da4772e735bc2eda596d Reviewed-on: https://gerrit.libreoffice.org/43324 Reviewed-by: Stephan Bergmann <sbergman@redhat.com> Tested-by: Stephan Bergmann <sbergman@redhat.com>
60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
/* -*- 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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#include "plugin.hxx"
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// Find occurrences of 'new T()' where the instance is zero-initialized upfront
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// since C++11. For one, in many cases this may be unnecessary and unintended,
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// as the code was written before C++11. For another, the zero-initialization
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// would go away when T gets a user-provided default constructor, for example,
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// so better make any necessary initialization more explicit in the code.
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namespace {
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class SubtleZeroInit final:
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public RecursiveASTVisitor<SubtleZeroInit>, public loplugin::Plugin
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{
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public:
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explicit SubtleZeroInit(InstantiationData const & data): Plugin(data) {}
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bool VisitCXXNewExpr(CXXNewExpr const * expr) {
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if (ignoreLocation(expr)) {
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return true;
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}
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auto ce = expr->getConstructExpr();
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if (ce == nullptr) {
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return true;
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}
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if (!ce->requiresZeroInitialization()) {
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return true;
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}
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report(
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DiagnosticsEngine::Warning,
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("if zero-initialization of %0 is intentional here, better make"
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" that more explicit (e.g., assigning to members, default"
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" constructor, default member initializers, std::memset)"),
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expr->getExprLoc())
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<< ce->getType() << expr->getSourceRange();
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return true;
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}
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private:
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void run() override {
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if (compiler.getLangOpts().CPlusPlus) {
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TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
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}
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}
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};
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static loplugin::Plugin::Registration<SubtleZeroInit> reg("subtlezeroinit");
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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