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, Inc., 59 Temple Place, Suite 330,
  20  * Boston, MA 02111-1307 USA
  21  *
  22  * As a special exception, the Free Software Foundation gives permission
  23  * for additional uses of the text contained in its release of GUILE.
  24  *
  25  * The exception is that, if you link the GUILE library with other files
  26  * to produce an executable, this does not by itself cause the
  27  * resulting executable to be covered by the GNU General Public License.
  28  * Your use of that executable is in no way restricted on account of
  29  * linking the GUILE library code into it.
  30  *
  31  * This exception does not however invalidate any other reasons why
  32  * the executable file might be covered by the GNU General Public License.
  33  *
  34  * This exception applies only to the code released by the
  35  * Free Software Foundation under the name GUILE.  If you copy
  36  * code from other Free Software Foundation releases into a copy of
  37  * GUILE, as the General Public License permits, the exception does
  38  * not apply to the code that you add in this way.  To avoid misleading
  39  * anyone as to the status of such modified files, you must delete
  40  * this exception notice from them.
  41  *
  42  * If you write modifications of your own for GUILE, it is your choice
  43  * whether to permit this exception to apply to your modifications.
  44  * If you do not wish that, delete this exception notice.  */
  45 \f
  46
  47 #include "libguile/__scm.h"
  48
  49 \f
  50
  51 typedef SCM (*scm_catch_body_t) SCM_P ((void *data));
  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 extern SCM scm_internal_stack_catch SCM_P ((SCM tag,
  68                                             scm_catch_body_t body,
  69                                             void *body_data,
  70                                             scm_catch_handler_t handler,
  71                                             void *handler_data));
  72
  73 /* The first argument to scm_body_thunk should be a pointer to one of
  74    these.  See the implementation of catch in throw.c.  */
  75 struct scm_body_thunk_data
  76 {
  77   /* The tag being caught.  We only use it to figure out what
  78      arguments to pass to the body procedure; see scm_catch_thunk_body for
  79      details.  */
  80   SCM tag;
  81
  82   /* The Scheme procedure object constituting the catch body.
  83      scm_body_by_proc invokes this.  */
  84   SCM body_proc;
  85 };
  86
  87 extern SCM scm_body_thunk SCM_P ((void *));
  88
  89
  90 extern SCM scm_handle_by_proc SCM_P ((void *, SCM, SCM));
  91 extern SCM scm_handle_by_proc_catching_all SCM_P ((void *, SCM, SCM));
  92 extern SCM scm_handle_by_message SCM_P ((void *, SCM, SCM));
  93 extern SCM scm_handle_by_message_noexit SCM_P ((void *, SCM, SCM));
  94 extern SCM scm_handle_by_throw SCM_P ((void *, SCM, SCM));
  95 extern int scm_exit_status SCM_P ((SCM args));
  96
  97 extern SCM scm_catch SCM_P ((SCM tag, SCM thunk, SCM handler));
  98 extern SCM scm_lazy_catch SCM_P ((SCM tag, SCM thunk, SCM handler));
  99 extern SCM scm_ithrow SCM_P ((SCM key, SCM args, int noreturn));
 100
 101 extern SCM scm_throw SCM_P ((SCM key, SCM args));
 102 extern void scm_init_throw SCM_P ((void));
 103 #endif  /* THROWH */