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 VisitUnaryOperator(UnaryOperator const * op);
  27 };
  28
  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             op->getBeginLoc())
  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: */