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Diffstat (limited to 'compilerplugins/clang/subtlezeroinit.cxx')
-rw-r--r-- | compilerplugins/clang/subtlezeroinit.cxx | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/compilerplugins/clang/subtlezeroinit.cxx b/compilerplugins/clang/subtlezeroinit.cxx new file mode 100644 index 000000000..b1b91c847 --- /dev/null +++ b/compilerplugins/clang/subtlezeroinit.cxx @@ -0,0 +1,67 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +#ifndef LO_CLANG_SHARED_PLUGINS + +#include "plugin.hxx" + +// Find occurrences of 'new T()' where the instance is zero-initialized upfront +// since C++11. For one, in many cases this may be unnecessary and unintended, +// as the code was written before C++11. For another, the zero-initialization +// would go away when T gets a user-provided default constructor, for example, +// so better make any necessary initialization more explicit in the code. + +namespace { + +class SubtleZeroInit final: + public loplugin::FilteringPlugin<SubtleZeroInit> +{ +public: + explicit SubtleZeroInit(loplugin::InstantiationData const & data): + FilteringPlugin(data) {} + + bool VisitCXXNewExpr(CXXNewExpr const * expr) { + if (ignoreLocation(expr)) { + return true; + } + auto ce = expr->getConstructExpr(); + if (ce == nullptr) { + return true; + } + if (!ce->requiresZeroInitialization()) { + return true; + } + report( + DiagnosticsEngine::Warning, + ("if zero-initialization of %0 is intentional here, better make" + " that more explicit (e.g., assigning to members, default" + " constructor, default member initializers, std::memset)"), + expr->getExprLoc()) + << ce->getType() << expr->getSourceRange(); + return true; + } + + virtual bool preRun() override { + return compiler.getLangOpts().CPlusPlus; + } + + virtual void run() override { + if (preRun()) { + TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); + } + } +}; + +static loplugin::Plugin::Registration<SubtleZeroInit> subtlezeroinit("subtlezeroinit"); + +} + +#endif // LO_CLANG_SHARED_PLUGINS + +/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */ |