86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
|
/*
|
||
|
|
* 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__ */
|
||
|
|
/** @} */
|