guile/libguile/throw.h

#ifndef SCM_THROW_H
#define SCM_THROW_H

/* Copyright 1995-1996,1998,2000,2006,2008,2010,2014,2017-2019
     Free Software Foundation, Inc.

   This file is part of Guile.

   Guile is free software: you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as published
   by the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Guile is distributed in the hope that it will be useful, but WITHOUT
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
   License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with Guile.  If not, see
   <https://www.gnu.org/licenses/>.  */



#include "libguile/scm.h"
#include "libguile/exceptions.h"



typedef scm_t_thunk scm_t_catch_body;
typedef SCM (*scm_t_catch_handler) (void *data,
                                    SCM tag, SCM throw_args);

SCM_INTERNAL SCM scm_i_make_catch_handler (scm_t_catch_handler h, void *data);

SCM_API SCM scm_c_catch (SCM tag,
			 scm_t_catch_body body,
			 void *body_data,
			 scm_t_catch_handler handler,
			 void *handler_data,
			 scm_t_catch_handler pre_unwind_handler,
			 void *pre_unwind_handler_data);

SCM_API SCM scm_c_with_throw_handler (SCM tag,
				      scm_t_catch_body body,
				      void *body_data,
				      scm_t_catch_handler handler,
				      void *handler_data,
				      int lazy_catch_p);

SCM_API SCM scm_internal_catch (SCM tag,
				scm_t_catch_body body,
				void *body_data,
				scm_t_catch_handler handler,
				void *handler_data);

/* The first argument to scm_body_thunk should be a pointer to one of
   these.  See the implementation of catch in throw.c.  */
struct scm_body_thunk_data
{
  /* The tag being caught.  We only use it to figure out what
     arguments to pass to the body procedure; see scm_catch_thunk_body for
     details.  */
  SCM tag;

  /* The Scheme procedure object constituting the catch body.
     scm_body_by_proc invokes this.  */
  SCM body_proc;
};

SCM_API SCM scm_body_thunk (void *);


SCM_API SCM scm_handle_by_proc (void *, SCM, SCM);
SCM_API SCM scm_handle_by_proc_catching_all (void *, SCM, SCM);
SCM_API SCM scm_handle_by_message (void *, SCM, SCM);
SCM_API SCM scm_handle_by_message_noexit (void *, SCM, SCM);
SCM_API SCM scm_handle_by_throw (void *, SCM, SCM);
SCM_API int scm_exit_status (SCM args);

SCM_API SCM scm_catch_with_pre_unwind_handler (SCM tag, SCM thunk, SCM handler, SCM lazy_handler);
SCM_API SCM scm_catch (SCM tag, SCM thunk, SCM handler);
SCM_API SCM scm_with_throw_handler (SCM tag, SCM thunk, SCM handler);
SCM_API SCM scm_ithrow (SCM key, SCM args, int no_return) SCM_NORETURN;

SCM_API SCM scm_throw (SCM key, SCM args) SCM_NORETURN;
SCM_INTERNAL void scm_init_throw (void);

#endif  /* SCM_THROW_H */