lc-addrlabels.h

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00001 /*
00002  * Copyright (c) 2004-2005, Swedish Institute of Computer Science.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * This file is part of the Contiki operating system.
00030  *
00031  * Author: Adam Dunkels <adam@sics.se>
00032  *
00033  * $Id: lc-addrlabels.h,v 1.4 2006/06/03 11:29:43 adam Exp $
00034  */
00035 
00036 /**
00037  * \addtogroup lc
00038  * @{
00039  */
00040 
00041 /**
00042  * \file
00043  * Implementation of local continuations based on the "Labels as
00044  * values" feature of gcc
00045  * \author
00046  * Adam Dunkels <adam@sics.se>
00047  *
00048  * This implementation of local continuations is based on a special
00049  * feature of the GCC C compiler called "labels as values". This
00050  * feature allows assigning pointers with the address of the code
00051  * corresponding to a particular C label.
00052  *
00053  * For more information, see the GCC documentation:
00054  * http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html
00055  *
00056  */
00057 
00058 #ifndef __LC_ADDRLABELS_H__
00059 #define __LC_ADDRLABELS_H__
00060 
00061 /** \hideinitializer */
00062 typedef void * lc_t;
00063 
00064 #define LC_INIT(s) s = NULL
00065 
00066 #define LC_RESUME(s)                            \
00067   do {                                          \
00068     if(s != NULL) {                             \
00069       goto *s;                                  \
00070     }                                           \
00071   } while(0)
00072 
00073 #define LC_CONCAT2(s1, s2) s1##s2
00074 #define LC_CONCAT(s1, s2) LC_CONCAT2(s1, s2)
00075 
00076 #define LC_SET(s)                               \
00077   do {                                          \
00078     LC_CONCAT(LC_LABEL, __LINE__):              \
00079     (s) = &&LC_CONCAT(LC_LABEL, __LINE__);      \
00080   } while(0)
00081 
00082 #define LC_END(s)
00083 
00084 #endif /* __LC_ADDRLABELS_H__ */
00085 /** @} */

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