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-rw-r--r--compilerplugins/clang/derefnullptr.cxx52
1 files changed, 52 insertions, 0 deletions
diff --git a/compilerplugins/clang/derefnullptr.cxx b/compilerplugins/clang/derefnullptr.cxx
new file mode 100644
index 0000000000..35c4c7adcf
--- /dev/null
+++ b/compilerplugins/clang/derefnullptr.cxx
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * 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"
+
+namespace {
+
+class DerefNullPtr:
+ public loplugin::FilteringPlugin<DerefNullPtr>
+{
+public:
+ explicit DerefNullPtr(loplugin::InstantiationData const & data):
+ FilteringPlugin(data) {}
+
+ void run() override
+ { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
+
+ bool VisitUnaryOperator(UnaryOperator const * op);
+};
+
+bool DerefNullPtr::VisitUnaryOperator(UnaryOperator const * op) {
+ if (op->getOpcode() != UO_Deref) {
+ return true;
+ }
+ if (!ignoreLocation(op)
+ && (op->getSubExpr()->IgnoreParenCasts()->isNullPointerConstant(
+ compiler.getASTContext(), Expr::NPC_ValueDependentIsNotNull/*TODO*/)
+ != Expr::NPCK_NotNull))
+ {
+ report(
+ DiagnosticsEngine::Warning, "null pointer dereference",
+ op->getBeginLoc())
+ << op->getSourceRange();
+ }
+ return true;
+}
+
+loplugin::Plugin::Registration<DerefNullPtr> derefnullptr("derefnullptr");
+
+}
+
+#endif // LO_CLANG_SHARED_PLUGINS
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */