compilerplugins/clang/derefnullptr.cxx

   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:
  20     explicit DerefNullPtr(loplugin::InstantiationData const & data):
  21         FilteringPlugin(data) {}
  22
  23     void run() override
  24     { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
  25
  26     bool VisitUnaryDeref(UnaryOperator const * op);
  27 };
  28
  29 bool DerefNullPtr::VisitUnaryDeref(UnaryOperator const * op) {
  30     if (!ignoreLocation(op)
  31         && (op->getSubExpr()->IgnoreParenCasts()->isNullPointerConstant(
  32                 compiler.getASTContext(), Expr::NPC_ValueDependentIsNotNull/*TODO*/)
  33             != Expr::NPCK_NotNull))
  34     {
  35         report(
  36             DiagnosticsEngine::Warning, "null pointer dereference",
  37             compat::getBeginLoc(op))
  38             << op->getSourceRange();
  39     }
  40     return true;
  41 }
  42
  43 loplugin::Plugin::Registration<DerefNullPtr> derefnullptr("derefnullptr");
  44
  45 }
  46
  47 #endif // LO_CLANG_SHARED_PLUGINS
  48
  49 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */