libguile/throw.h

   1 /* classes: h_files */
   2
   3 #ifndef THROWH
   4 #define THROWH
   5 /*      Copyright (C) 1995,1996 Free Software Foundation, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this software; see the file COPYING.  If not, write to
  19  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  * As a special exception, the Free Software Foundation gives permission
  22  * for additional uses of the text contained in its release of GUILE.
  23  *
  24  * The exception is that, if you link the GUILE library with other files
  25  * to produce an executable, this does not by itself cause the
  26  * resulting executable to be covered by the GNU General Public License.
  27  * Your use of that executable is in no way restricted on account of
  28  * linking the GUILE library code into it.
  29  *
  30  * This exception does not however invalidate any other reasons why
  31  * the executable file might be covered by the GNU General Public License.
  32  *
  33  * This exception applies only to the code released by the
  34  * Free Software Foundation under the name GUILE.  If you copy
  35  * code from other Free Software Foundation releases into a copy of
  36  * GUILE, as the General Public License permits, the exception does
  37  * not apply to the code that you add in this way.  To avoid misleading
  38  * anyone as to the status of such modified files, you must delete
  39  * this exception notice from them.
  40  *
  41  * If you write modifications of your own for GUILE, it is your choice
  42  * whether to permit this exception to apply to your modifications.
  43  * If you do not wish that, delete this exception notice.
  44  */
  45 \f
  46
  47 #include "libguile/__scm.h"
  48
  49 \f
  50
  51 typedef SCM (*scm_catch_body_t) SCM_P ((void *data, SCM jmpbuf));
  52 typedef SCM (*scm_catch_handler_t) SCM_P ((void *data,
  53                                            SCM tag, SCM throw_args));
  54
  55 extern SCM scm_internal_catch SCM_P ((SCM tag,
  56                                       scm_catch_body_t body,
  57                                       void *body_data,
  58                                       scm_catch_handler_t handler,
  59                                       void *handler_data));
  60
  61 extern SCM scm_internal_lazy_catch SCM_P ((SCM tag,
  62                                            scm_catch_body_t body,
  63                                            void *body_data,
  64                                            scm_catch_handler_t handler,
  65                                            void *handler_data));
  66
  67 /* The first argument to scm_body_thunk should be a pointer to one of
  68    these.  See the implementation of catch in throw.c.  */
  69 struct scm_body_thunk_data
  70 {
  71   /* The tag being caught.  We only use it to figure out what
  72      arguments to pass to the body procedure; see scm_catch_thunk_body for
  73      details.  */
  74   SCM tag;
  75
  76   /* The Scheme procedure object constituting the catch body.
  77      scm_body_by_proc invokes this.  */
  78   SCM body_proc;
  79 };
  80
  81 extern SCM scm_body_thunk SCM_P ((void *, SCM));
  82
  83
  84 extern SCM scm_handle_by_proc SCM_P ((void *, SCM, SCM));
  85 extern SCM scm_handle_by_message SCM_P ((void *, SCM, SCM));
  86
  87 extern SCM scm_catch SCM_P ((SCM tag, SCM thunk, SCM handler));
  88 extern SCM scm_lazy_catch SCM_P ((SCM tag, SCM thunk, SCM handler));
  89 extern SCM scm_ithrow SCM_P ((SCM key, SCM args, int noreturn));
  90 extern SCM scm_throw SCM_P ((SCM key, SCM args));
  91 extern void scm_init_throw SCM_P ((void));
  92 #endif  /* THROWH */