| 1 |
606 |
jeremybenn |
/*
|
| 2 |
|
|
* Copyright (c) 2004-2005, Swedish Institute of Computer Science.
|
| 3 |
|
|
* All rights reserved.
|
| 4 |
|
|
*
|
| 5 |
|
|
* Redistribution and use in source and binary forms, with or without
|
| 6 |
|
|
* modification, are permitted provided that the following conditions
|
| 7 |
|
|
* are met:
|
| 8 |
|
|
* 1. Redistributions of source code must retain the above copyright
|
| 9 |
|
|
* notice, this list of conditions and the following disclaimer.
|
| 10 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
| 11 |
|
|
* notice, this list of conditions and the following disclaimer in the
|
| 12 |
|
|
* documentation and/or other materials provided with the distribution.
|
| 13 |
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
| 14 |
|
|
* may be used to endorse or promote products derived from this software
|
| 15 |
|
|
* without specific prior written permission.
|
| 16 |
|
|
*
|
| 17 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
| 18 |
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
| 19 |
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
| 20 |
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
| 21 |
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
| 22 |
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
| 23 |
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
| 24 |
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
| 25 |
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
| 26 |
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
| 27 |
|
|
* SUCH DAMAGE.
|
| 28 |
|
|
*
|
| 29 |
|
|
* This file is part of the uIP TCP/IP stack
|
| 30 |
|
|
*
|
| 31 |
|
|
* Author: Adam Dunkels <adam@sics.se>
|
| 32 |
|
|
*
|
| 33 |
|
|
* $Id: lc-addrlabels.h 2 2011-07-17 20:13:17Z filepang@gmail.com $
|
| 34 |
|
|
*/
|
| 35 |
|
|
|
| 36 |
|
|
/**
|
| 37 |
|
|
* \addtogroup lc
|
| 38 |
|
|
* @{
|
| 39 |
|
|
*/
|
| 40 |
|
|
|
| 41 |
|
|
/**
|
| 42 |
|
|
* \file
|
| 43 |
|
|
* Implementation of local continuations based on the "Labels as
|
| 44 |
|
|
* values" feature of gcc
|
| 45 |
|
|
* \author
|
| 46 |
|
|
* Adam Dunkels <adam@sics.se>
|
| 47 |
|
|
*
|
| 48 |
|
|
* This implementation of local continuations is based on a special
|
| 49 |
|
|
* feature of the GCC C compiler called "labels as values". This
|
| 50 |
|
|
* feature allows assigning pointers with the address of the code
|
| 51 |
|
|
* corresponding to a particular C label.
|
| 52 |
|
|
*
|
| 53 |
|
|
* For more information, see the GCC documentation:
|
| 54 |
|
|
* http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html
|
| 55 |
|
|
*
|
| 56 |
|
|
* Thanks to dividuum for finding the nice local scope label
|
| 57 |
|
|
* implementation.
|
| 58 |
|
|
*/
|
| 59 |
|
|
|
| 60 |
|
|
#ifndef __LC_ADDRLABELS_H__
|
| 61 |
|
|
#define __LC_ADDRLABELS_H__
|
| 62 |
|
|
|
| 63 |
|
|
/** \hideinitializer */
|
| 64 |
|
|
typedef void * lc_t;
|
| 65 |
|
|
|
| 66 |
|
|
#define LC_INIT(s) s = NULL
|
| 67 |
|
|
|
| 68 |
|
|
|
| 69 |
|
|
#define LC_RESUME(s) \
|
| 70 |
|
|
do { \
|
| 71 |
|
|
if(s != NULL) { \
|
| 72 |
|
|
goto *s; \
|
| 73 |
|
|
} \
|
| 74 |
|
|
} while(0)
|
| 75 |
|
|
|
| 76 |
|
|
#define LC_SET(s) \
|
| 77 |
|
|
do { ({ __label__ resume; resume: (s) = &&resume; }); }while(0)
|
| 78 |
|
|
|
| 79 |
|
|
#define LC_END(s)
|
| 80 |
|
|
|
| 81 |
|
|
#endif /* __LC_ADDRLABELS_H__ */
|
| 82 |
|
|
|
| 83 |
|
|
/** @} */
|
