1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 /*
3  * This file is part of the LibreOffice project.
4  *
5  * This Source Code Form is subject to the terms of the Mozilla Public
6  * License, v. 2.0. If a copy of the MPL was not distributed with this
7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8  */
9 
10 #ifndef LO_CLANG_SHARED_PLUGINS
11 
12 #include "plugin.hxx"
13 
14 namespace {
15 
16 class DerefNullPtr:
17     public loplugin::FilteringPlugin<DerefNullPtr>
18 {
19 public:
DerefNullPtr(loplugin::InstantiationData const & data)20     explicit DerefNullPtr(loplugin::InstantiationData const & data):
21         FilteringPlugin(data) {}
22 
run()23     void run() override
24     { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
25 
26     bool VisitUnaryOperator(UnaryOperator const * op);
27 };
28 
VisitUnaryOperator(UnaryOperator const * op)29 bool DerefNullPtr::VisitUnaryOperator(UnaryOperator const * op) {
30     if (op->getOpcode() != UO_Deref) {
31         return true;
32     }
33     if (!ignoreLocation(op)
34         && (op->getSubExpr()->IgnoreParenCasts()->isNullPointerConstant(
35                 compiler.getASTContext(), Expr::NPC_ValueDependentIsNotNull/*TODO*/)
36             != Expr::NPCK_NotNull))
37     {
38         report(
39             DiagnosticsEngine::Warning, "null pointer dereference",
40             compat::getBeginLoc(op))
41             << op->getSourceRange();
42     }
43     return true;
44 }
45 
46 loplugin::Plugin::Registration<DerefNullPtr> derefnullptr("derefnullptr");
47 
48 }
49 
50 #endif // LO_CLANG_SHARED_PLUGINS
51 
52 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
53