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/* classes: h_files */
#ifndef SCM_STACKS_H
#define SCM_STACKS_H
/* Copyright (C) 1995,1996,2000,2001, 2004, 2006, 2008 Free Software Foundation, Inc.
*
* This library 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.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include "libguile/__scm.h"
/* {Frames and stacks}
*/
typedef struct scm_t_info_frame {
/* SCM flags; */
scm_t_bits flags;
SCM source;
SCM proc;
SCM args;
} scm_t_info_frame;
#define SCM_FRAME_N_SLOTS (sizeof (scm_t_info_frame) / sizeof (SCM))
#define SCM_STACK(obj) ((scm_t_stack *) SCM_STRUCT_DATA (obj))
#define SCM_STACK_LAYOUT "pwuourpW"
typedef struct scm_t_stack {
SCM id; /* Stack id */
scm_t_info_frame *frames; /* Info frames */
unsigned long length; /* Stack length */
unsigned long tail_length;
scm_t_info_frame tail[1];
} scm_t_stack;
SCM_API SCM scm_stack_type;
#define SCM_STACKP(obj) (SCM_STRUCTP (obj) && scm_is_eq (SCM_STRUCT_VTABLE (obj), scm_stack_type))
#define SCM_STACK_LENGTH(stack) (SCM_STACK (stack) -> length)
#define SCM_FRAMEP(obj) \
(scm_is_pair (obj) && SCM_STACKP (SCM_CAR (obj)) \
&& scm_is_unsigned_integer (SCM_CDR (obj), \
0, SCM_STACK_LENGTH (SCM_CAR (obj))-1))
#define SCM_FRAME_REF(frame, slot) \
(SCM_STACK (SCM_CAR (frame)) -> frames[scm_to_size_t (SCM_CDR (frame))].slot)
#define SCM_FRAME_NUMBER(frame) \
(SCM_BACKWARDS_P \
? scm_to_size_t (SCM_CDR (frame)) \
: (SCM_STACK_LENGTH (SCM_CAR (frame)) \
- scm_to_size_t (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(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_VOID)
#define SCM_FRAME_REAL_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_REAL)
#define SCM_FRAME_PROC_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_PROC)
#define SCM_FRAME_EVAL_ARGS_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_EVAL_ARGS)
#define SCM_FRAME_OVERFLOW_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_OVERFLOW)
SCM_API SCM scm_stack_p (SCM obj);
SCM_API SCM scm_make_stack (SCM obj, SCM args);
SCM_API SCM scm_stack_id (SCM stack);
SCM_API SCM scm_stack_ref (SCM stack, SCM i);
SCM_API SCM scm_stack_length (SCM stack);
SCM_API SCM scm_frame_p (SCM obj);
SCM_API SCM scm_last_stack_frame (SCM obj);
SCM_API SCM scm_frame_number (SCM frame);
SCM_API SCM scm_frame_source (SCM frame);
SCM_API SCM scm_frame_procedure (SCM frame);
SCM_API SCM scm_frame_arguments (SCM frame);
SCM_API SCM scm_frame_previous (SCM frame);
SCM_API SCM scm_frame_next (SCM frame);
SCM_API SCM scm_frame_real_p (SCM frame);
SCM_API SCM scm_frame_procedure_p (SCM frame);
SCM_API SCM scm_frame_evaluating_args_p (SCM frame);
SCM_API SCM scm_frame_overflow_p (SCM frame);
SCM_INTERNAL void scm_init_stacks (void);
#endif /* SCM_STACKS_H */
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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