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 #include "plugin.hxx"
  11
  12 namespace {
  13
  14 class DerefNullPtr:
  15     public RecursiveASTVisitor<DerefNullPtr>, public loplugin::Plugin
  16 {
  17 public:
  18     explicit DerefNullPtr(loplugin::InstantiationData const & data):
  19         Plugin(data) {}
  20
  21     void run() override
  22     { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
  23
  24     bool VisitUnaryDeref(UnaryOperator const * op);
  25 };
  26
  27 bool DerefNullPtr::VisitUnaryDeref(UnaryOperator const * op) {
  28     if (!ignoreLocation(op)
  29         && (op->getSubExpr()->IgnoreParenCasts()->isNullPointerConstant(
  30                 compiler.getASTContext(), Expr::NPC_ValueDependentIsNotNull/*TODO*/)
  31             != Expr::NPCK_NotNull))
  32     {
  33         report(
  34             DiagnosticsEngine::Warning, "null pointer dereference",
  35             op->getLocStart())
  36             << op->getSourceRange();
  37     }
  38     return true;
  39 }
  40
  41 loplugin::Plugin::Registration<DerefNullPtr> X("derefnullptr");
  42
  43 }
  44
  45 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */