text: /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
  /*
   * Copyright (c) 2006,2007 INESC Porto, INRIA
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation;
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   *
   * Author: Gustavo Carneiro <gjc@inescporto.pt>
   * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
   */
  #ifndef BREAKPOINT_H
  #define BREAKPOINT_H
  
  namespace ns3 {
  
  /* Hacker macro to place breakpoints for selected machines.
   * Actual use is strongly discouraged of course ;)
   * Copied from GLib 2.12.9.
   * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   *
   * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
   * file for a list of people on the GLib Team.  See the ChangeLog
   * files for a list of changes.  These files are distributed with
   * GLib at ftp://ftp.gtk.org/pub/gtk/. 
   */
  
  /**
   * \ingroup debugging
   *
   * Inserts a breakpoint instruction (or equivalent system call) into
   * the code for selected machines.  When an NS_ASSERT cannot verify its condition, 
   * this macro is used. Falls back to calling
   * AssertBreakpoint() for architectures where breakpoint assembly
   * instructions are not supported.
   */
  #if (defined (__i386__) || defined (__amd64__) || defined (__x86_64__)) && defined (__GNUC__) && __GNUC__ >= 2
  #  define NS_BREAKPOINT() \
    do { __asm__ __volatile__ ("int $03"); } while(false)
  #elif defined (_MSC_VER) && defined (_M_IX86)
  #  define NS_BREAKPOINT() \
    do { __asm int 3h } while(false)
  #elif defined (__alpha__) && !defined(__osf__) && defined (__GNUC__) && __GNUC__ >= 2
  #  define NS_BREAKPOINT() \
    do { __asm__ __volatile__ ("bpt"); } while(false)
  #else   /* !__i386__ && !__alpha__ */
  #  define NS_BREAKPOINT()    ns3::BreakpointFallback ()
  #endif
  
  /**
   * \brief fallback breakpoint function
   *
   * This function is used by the NS_BREAKPOINT() macro as a fallback
   * for when breakpoint assembly instructions are not available.  It
   * attempts to halt program execution either by a raising SIGTRAP, on
   * unix systems, or by dereferencing a null pointer.
   * 
   * Normally you should not call this function directly.
   */
  void BreakpointFallback (void);
  
  
  } // namespace ns3
  
  
  #endif /* BREAKPOINT_H */
  