/* * Copyright (c) 2004-2005, Swedish Institute of Computer Science. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. Neither the name of the Institute nor the names of its contributors *    may be used to endorse or promote products derived from this software *    without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * This file is part of the Contiki operating system. * * Author: Adam Dunkels <adam@sics.se> * * $Id: lc-addrlabels.h,v 1.4 2006/06/03 11:29:43 adam Exp $ *//** * \addtogroup lc * @{ *//** * \file * Implementation of local continuations based on the "Labels as * values" feature of gcc * \author * Adam Dunkels <adam@sics.se> * * This implementation of local continuations is based on a special * feature of the GCC C compiler called "labels as values". This * feature allows assigning pointers with the address of the code * corresponding to a particular C label. * * For more information, see the GCC documentation: * http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html * */#ifndef __LC_ADDRLABELS_H__#define __LC_ADDRLABELS_H__/** \hideinitializer */typedef void * lc_t;#define LC_INIT(s) s = NULL#define LC_RESUME(s)				\  do {						\    if(s != NULL) {				\      goto *s;					\    }						\  } while(0)#define LC_CONCAT2(s1, s2) s1##s2#define LC_CONCAT(s1, s2) LC_CONCAT2(s1, s2)#define LC_SET(s)				\  do {						\    LC_CONCAT(LC_LABEL, __LINE__):   	        \    (s) = &&LC_CONCAT(LC_LABEL, __LINE__);	\  } while(0)#define LC_END(s)#endif /* __LC_ADDRLABELS_H__ *//** @} */