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