/* classes: h_files */

#ifndef STACKCHKH
#define STACKCHKH
/*	Copyright (C) 1995,1996,1998 Free Software Foundation, Inc.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA
 *
 * As a special exception, the Free Software Foundation gives permission
 * for additional uses of the text contained in its release of GUILE.
 *
 * The exception is that, if you link the GUILE library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the GUILE library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the
 * Free Software Foundation under the name GUILE.  If you copy
 * code from other Free Software Foundation releases into a copy of
 * GUILE, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for GUILE, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.  */

#include "libguile/__scm.h"

#include "libguile/continuations.h"
#ifdef DEBUG_EXTENSIONS
#include "libguile/debug.h"
#endif


/* With debug extensions we have the possibility to use the debug options
 * to disable stack checking.
 */
#ifdef DEBUG_EXTENSIONS
#define SCM_STACK_CHECKING_P SCM_STACK_LIMIT
#else
/* *fixme* This option should be settable also without debug extensions. */
#define SCM_STACK_LIMIT 100000
#define SCM_STACK_CHECKING_P 1
#endif

#ifdef STACK_CHECKING
# ifdef SCM_STACK_GROWS_UP
#  define SCM_STACK_OVERFLOW_P(s)\
   (s > ((SCM_STACKITEM *) SCM_BASE (scm_rootcont) + SCM_STACK_LIMIT))
# else
#  define SCM_STACK_OVERFLOW_P(s)\
   (s < ((SCM_STACKITEM *) SCM_BASE (scm_rootcont) - SCM_STACK_LIMIT))
# endif
# define SCM_CHECK_STACK\
    {\
       SCM_STACKITEM stack;\
       if (SCM_STACK_OVERFLOW_P (&stack) && scm_stack_checking_enabled_p)\
	 scm_report_stack_overflow ();\
    }
#else
# define SCM_CHECK_STACK /**/
#endif /* STACK_CHECKING */

extern int scm_stack_checking_enabled_p;



extern void scm_report_stack_overflow SCM_P ((void));
extern long scm_stack_size SCM_P ((SCM_STACKITEM *start));
extern void scm_stack_report SCM_P ((void));
extern void scm_init_stackchk SCM_P ((void));

#endif  /* STACKCHKH */