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/* classes: h_files */
#ifndef STACKSH
#define STACKSH
/* Copyright (C) 1995,1996 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 */
#include "libguile/__scm.h"
/* {Frames and stacks}
*/
typedef struct scm_info_frame {
SCM flags;
SCM source;
SCM proc;
SCM args;
} scm_info_frame;
#define SCM_FRAME_N_SLOTS (sizeof (scm_info_frame) / sizeof (SCM))
#define SCM_STACK(obj) ((scm_stack *) SCM_STRUCT_DATA (obj))
#define SCM_STACK_LAYOUT "pwuourpW"
typedef struct scm_stack {
SCM id; /* Stack id */
scm_info_frame *frames; /* Info frames */
unsigned int length; /* Stack length */
unsigned int tail_length;
scm_info_frame tail[1];
} scm_stack;
extern SCM scm_stack_type;
#define SCM_STACKP(obj) (SCM_STRUCTP (obj) && SCM_STRUCT_VTABLE (obj) == scm_stack_type)
#define SCM_STACK_LENGTH(stack) (SCM_STACK (stack) -> length)
#define SCM_FRAMEP(obj) (SCM_CONSP (obj) \
&& SCM_NIMP (SCM_CAR (obj)) \
&& SCM_STACKP (SCM_CAR (obj)) \
&& SCM_INUMP (SCM_CDR (obj))) \
#define SCM_FRAME_REF(frame, slot) \
(SCM_STACK (SCM_CAR (frame)) -> frames[SCM_INUM (SCM_CDR (frame))].slot) \
#define SCM_FRAME_NUMBER(frame) \
(SCM_BACKWARDS_P \
? SCM_INUM (SCM_CDR (frame)) \
: (SCM_STACK_LENGTH (SCM_CAR (frame)) \
- SCM_INUM (SCM_CDR (frame)) \
- 1)) \
#define SCM_FRAME_FLAGS(frame) SCM_FRAME_REF (frame, flags)
#define SCM_FRAME_SOURCE(frame) SCM_FRAME_REF (frame, source)
#define SCM_FRAME_PROC(frame) SCM_FRAME_REF (frame, proc)
#define SCM_FRAME_ARGS(frame) SCM_FRAME_REF (frame, args)
#define SCM_FRAME_PREV(frame) scm_frame_previous (frame)
#define SCM_FRAME_NEXT(frame) scm_frame_next (frame)
#define SCM_FRAMEF_VOID (1L << 2)
#define SCM_FRAMEF_REAL (1L << 3)
#define SCM_FRAMEF_PROC (1L << 4)
#define SCM_FRAMEF_EVAL_ARGS (1L << 5)
#define SCM_FRAMEF_OVERFLOW (1L << 6)
#define SCM_FRAME_VOID_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_VOID)
#define SCM_FRAME_REAL_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_REAL)
#define SCM_FRAME_PROC_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_PROC)
#define SCM_FRAME_EVAL_ARGS_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_EVAL_ARGS)
#define SCM_FRAME_OVERFLOW_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_OVERFLOW)
SCM scm_stack_p SCM_P ((SCM obj));
SCM scm_make_stack SCM_P ((SCM args));
SCM scm_stack_ref SCM_P ((SCM stack, SCM i));
SCM scm_stack_length SCM_P ((SCM stack));
SCM scm_frame_p SCM_P ((SCM obj));
SCM scm_last_stack_frame SCM_P ((SCM obj));
SCM scm_frame_number SCM_P ((SCM frame));
SCM scm_frame_source SCM_P ((SCM frame));
SCM scm_frame_procedure SCM_P ((SCM frame));
SCM scm_frame_arguments SCM_P ((SCM frame));
SCM scm_frame_previous SCM_P ((SCM frame));
SCM scm_frame_next SCM_P ((SCM frame));
SCM scm_frame_real_p SCM_P ((SCM frame));
SCM scm_frame_procedure_p SCM_P ((SCM frame));
SCM scm_frame_evaluating_args_p SCM_P ((SCM frame));
SCM scm_frame_overflow_p SCM_P ((SCM frame));
void scm_init_stacks SCM_P ((void));
#endif /* STACKSH */
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