source: uKadecot/trunk/uip/uip/lc-addrlabels.h@ 108

Last change on this file since 108 was 108, checked in by coas-nagasima, 8 years ago

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1/*
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 108 2015-06-11 09:15:46Z coas-nagasima $
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 */
64typedef 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/** @} */
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