1 | /*
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2 | * Copyright (c) 2004-2005, Swedish Institute of Computer Science.
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the Institute nor the names of its contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | *
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29 | * This file is part of the uIP TCP/IP stack
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30 | *
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31 | * Author: Adam Dunkels <adam@sics.se>
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32 | *
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33 | * $Id: lc-addrlabels.h 157 2016-02-20 11:16:05Z coas-nagasima $
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34 | */
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35 |
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36 | /**
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37 | * \addtogroup lc
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38 | * @{
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39 | */
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40 |
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41 | /**
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42 | * \file
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43 | * Implementation of local continuations based on the "Labels as
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44 | * values" feature of gcc
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45 | * \author
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46 | * Adam Dunkels <adam@sics.se>
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47 | *
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48 | * This implementation of local continuations is based on a special
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49 | * feature of the GCC C compiler called "labels as values". This
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50 | * feature allows assigning pointers with the address of the code
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51 | * corresponding to a particular C label.
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52 | *
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53 | * For more information, see the GCC documentation:
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54 | * http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html
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55 | *
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56 | * Thanks to dividuum for finding the nice local scope label
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57 | * implementation.
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58 | */
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59 |
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60 | #ifndef __LC_ADDRLABELS_H__
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61 | #define __LC_ADDRLABELS_H__
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62 |
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63 | /** \hideinitializer */
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64 | typedef void * lc_t;
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65 |
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66 | #define LC_INIT(s) s = NULL
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67 |
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68 |
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69 | #define LC_RESUME(s) \
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70 | do { \
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71 | if(s != NULL) { \
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72 | goto *s; \
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73 | } \
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74 | } while(0)
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75 |
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76 | #define LC_SET(s) \
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77 | do { ({ __label__ resume; resume: (s) = &&resume; }); }while(0)
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78 |
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79 | #define LC_END(s)
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80 |
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81 | #endif /* __LC_ADDRLABELS_H__ */
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82 |
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83 | /** @} */
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