| /* |
| * 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 1.2 2005/04/01 08:12:36 adamdunkels 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__ */ |