/* classes: h_files */

#ifndef DEBUGH
#define DEBUGH
/*	Copyright (C) 1995,1996,1998, 1999, 2000 Free Software Foundation
 * 
 * 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.
 *
 * The author can be reached at djurfeldt@nada.kth.se
 * Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN */

/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
   gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */


#include "libguile/__scm.h"

#include "libguile/options.h"


/*
 * Here comes some definitions for the debugging machinery.
 * It might seem strange to represent debug flags as ints,
 * but consider that any particular piece of code is normally
 * only interested in one flag at a time.  This is then
 * the most efficient representation.
 */

/* {Options}
 */

/* scm_debug_opts is  defined in eval.c.
 */

extern scm_option scm_debug_opts[];

#define SCM_CHEAPTRAPS_P	scm_debug_opts[0].val
#define SCM_BREAKPOINTS_P	scm_debug_opts[1].val
#define SCM_TRACE_P		scm_debug_opts[2].val
#define SCM_REC_PROCNAMES_P	scm_debug_opts[3].val
#define SCM_BACKWARDS_P		scm_debug_opts[4].val
#define SCM_BACKTRACE_WIDTH   	scm_debug_opts[5].val
#define SCM_BACKTRACE_INDENT   	scm_debug_opts[6].val
#define SCM_N_FRAMES		scm_debug_opts[7].val
#define SCM_BACKTRACE_MAXDEPTH	scm_debug_opts[8].val
#define SCM_BACKTRACE_DEPTH	scm_debug_opts[9].val
#define SCM_BACKTRACE_P		scm_debug_opts[10].val
#define SCM_DEVAL_P		scm_debug_opts[11].val
#define SCM_STACK_LIMIT		scm_debug_opts[12].val
#define SCM_N_DEBUG_OPTIONS 13

extern SCM (*scm_ceval_ptr) (SCM exp, SCM env);

extern int scm_debug_mode;
extern int scm_check_entry_p, scm_check_apply_p, scm_check_exit_p;

#define CHECK_ENTRY      scm_check_entry_p
#define CHECK_APPLY	 scm_check_apply_p
#define CHECK_EXIT       scm_check_exit_p

#define SCM_RESET_DEBUG_MODE \
do {\
  CHECK_ENTRY = SCM_ENTER_FRAME_P || SCM_BREAKPOINTS_P;\
  CHECK_APPLY = SCM_APPLY_FRAME_P || SCM_TRACE_P;\
  CHECK_EXIT = SCM_EXIT_FRAME_P || SCM_TRACE_P;\
  scm_debug_mode = SCM_DEVAL_P || CHECK_ENTRY || CHECK_APPLY || CHECK_EXIT;\
  scm_ceval_ptr = scm_debug_mode ? scm_deval : scm_ceval;\
} while (0)


/* {Evaluator}
 */

typedef union scm_debug_info
{
  struct { SCM exp, env; } e;
  struct { SCM proc, args; } a;
  SCM id;
} scm_debug_info;

extern int scm_debug_eframe_size;

typedef struct scm_debug_frame
{
  struct scm_debug_frame *prev;
  long status;
  scm_debug_info *vect;
  scm_debug_info *info;
} scm_debug_frame;

#ifndef USE_THREADS
extern scm_debug_frame *scm_last_debug_frame;
#endif

#define SCM_EVALFRAME    (0L << 11)
#define SCM_APPLYFRAME   (1L << 11)
#define SCM_VOIDFRAME    (3L << 11)
#define SCM_MACROEXPF    (1L << 10)
#define SCM_TAILREC      (1L << 9)
#define SCM_TRACED_FRAME (1L << 8)
#define SCM_ARGS_READY   (1L << 7)
#define SCM_DOVERFLOW    (1L << 6)
#define SCM_MAX_FRAME_SIZE 63 /* also used as a mask for the size field */

#define SCM_FRAMETYPE    (3L << 11)

#define SCM_EVALFRAMEP(x) (((x).status & SCM_FRAMETYPE) == SCM_EVALFRAME)
#define SCM_APPLYFRAMEP(x) (((x).status & SCM_FRAMETYPE) == SCM_APPLYFRAME)
#define SCM_VOIDFRAMEP(x) (((x).status & SCM_FRAMETYPE) == SCM_VOIDFRAME)
#define SCM_OVERFLOWP(x) (((x).status & SCM_DOVERFLOW) != 0)
#define SCM_ARGS_READY_P(x) (((x).status & SCM_ARGS_READY) != 0)
#define SCM_TRACED_FRAME_P(x) (((x).status & SCM_TRACED_FRAME) != 0)
#define SCM_TAILRECP(x) (((x).status & SCM_TAILREC) != 0)
#define SCM_MACROEXPP(x) (((x).status & SCM_MACROEXPF) != 0)
#define SCM_SET_OVERFLOW(x) ((x).status |= SCM_DOVERFLOW)
#define SCM_SET_ARGSREADY(x) ((x).status |= SCM_ARGS_READY)
#define SCM_CLEAR_ARGSREADY(x) ((x).status &= ~SCM_ARGS_READY)
#define SCM_SET_TRACED_FRAME(x) ((x).status |= SCM_TRACED_FRAME)
#define SCM_CLEAR_TRACED_FRAME(x) ((x).status &= ~SCM_TRACED_FRAME)
#define SCM_SET_TAILREC(x) ((x).status |= SCM_TAILREC)
#define SCM_SET_MACROEXP(x) ((x).status |= SCM_MACROEXPF)
#define SCM_CLEAR_MACROEXP(x) ((x).status &= ~SCM_MACROEXPF)

#define SCM_DEBUGGINGP scm_debug_mode
#define SCM_DSIDEVAL(x, env) if NIMP(x) scm_deval((x), (env))

/* {Debug Objects}
 */

extern long scm_tc16_debugobj;

#define SCM_DEBUGOBJP(x)              (SCM_NIMP (x) \
                                       && (SCM_TYP16 (x) == scm_tc16_debugobj))
#define SCM_DEBUGOBJ_FRAME(x)         (SCM_CELL_WORD_1 (x))
#define SCM_SET_DEBUGOBJ_FRAME(x, f)  (SCM_SET_CELL_WORD_1 (x, f))

/* {Memoized Source}
 */

extern long scm_tc16_memoized;

#define SCM_MEMOIZEDP(x) (SCM_NIMP(x) && (scm_tc16_memoized == SCM_TYP16 (x)))
#define SCM_MEMOIZED_EXP(x) SCM_CAR (SCM_CDR (x))
#define SCM_MEMOIZED_ENV(x) SCM_CDR (SCM_CDR (x))



extern SCM * scm_lookup_cstr (char *str, int len, SCM env);
extern SCM * scm_lookup_soft (SCM var, SCM genv);
extern SCM scm_evstr (char *str);
extern SCM scm_eval_string (SCM str);
extern int scm_ready_p (void);
extern void debug_print (SCM obj);
extern SCM scm_debug_object_p (SCM obj);
extern SCM scm_local_eval (SCM exp, SCM env);
extern SCM scm_reverse_lookup (SCM env, SCM data);
extern SCM scm_start_stack (SCM id, SCM exp, SCM env);
extern SCM scm_procedure_environment (SCM proc);
extern SCM scm_procedure_source (SCM proc);
extern SCM scm_procedure_name (SCM proc);
extern SCM scm_memoized_environment (SCM m);
extern SCM scm_make_memoized (SCM exp, SCM env);
extern SCM scm_memoized_p (SCM obj);
extern SCM scm_with_traps (SCM thunk);
extern SCM scm_evaluator_traps (SCM setting);
extern SCM scm_debug_options (SCM setting);
extern SCM scm_unmemoize (SCM memoized);
extern SCM scm_make_debugobj (scm_debug_frame* debug);
extern void scm_init_debug (void);

#ifdef GUILE_DEBUG
extern SCM scm_make_gloc (SCM var, SCM env);
extern SCM scm_gloc_p (SCM obj);
extern SCM scm_make_iloc (SCM frame, SCM binding, SCM cdrp);
extern SCM scm_iloc_p (SCM obj);
extern SCM scm_memcons (SCM car, SCM cdr, SCM env);
extern SCM scm_mem_to_proc (SCM obj);
extern SCM scm_proc_to_mem (SCM obj);
extern SCM scm_debug_hang (SCM obj);
#endif /*GUILE_DEBUG*/

#endif /* DEBUGH */

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/
