5 /* Copyright (C) 1995,1996 Free Software Foundation
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this software; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20 * Boston, MA 02111-1307 USA
22 * As a special exception, the Free Software Foundation gives permission
23 * for additional uses of the text contained in its release of GUILE.
25 * The exception is that, if you link the GUILE library with other files
26 * to produce an executable, this does not by itself cause the
27 * resulting executable to be covered by the GNU General Public License.
28 * Your use of that executable is in no way restricted on account of
29 * linking the GUILE library code into it.
31 * This exception does not however invalidate any other reasons why
32 * the executable file might be covered by the GNU General Public License.
34 * This exception applies only to the code released by the
35 * Free Software Foundation under the name GUILE. If you copy
36 * code from other Free Software Foundation releases into a copy of
37 * GUILE, as the General Public License permits, the exception does
38 * not apply to the code that you add in this way. To avoid misleading
39 * anyone as to the status of such modified files, you must delete
40 * this exception notice from them.
42 * If you write modifications of your own for GUILE, it is your choice
43 * whether to permit this exception to apply to your modifications.
44 * If you do not wish that, delete this exception notice.
46 * The author can be reached at djurfeldt@nada.kth.se
47 * Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN */
49 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
50 gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
53 #include "libguile/__scm.h"
55 /* {Frames and stacks}
58 typedef struct scm_info_frame
{
65 #define SCM_FRAME_N_SLOTS (sizeof (scm_info_frame) / sizeof (SCM))
67 #define SCM_STACK(obj) ((scm_stack *) SCM_STRUCT_DATA (obj))
68 #define SCM_STACK_LAYOUT "pwuourpW"
69 typedef struct scm_stack
{
70 SCM id
; /* Stack id */
71 scm_info_frame
*frames
; /* Info frames */
72 unsigned int length
; /* Stack length */
73 unsigned int tail_length
;
74 scm_info_frame tail
[1];
77 extern SCM scm_stack_type
;
79 #define SCM_STACKP(obj) (SCM_NIMP(obj) && \
80 SCM_STRUCTP (obj) && SCM_STRUCT_VTABLE (obj) == scm_stack_type)
81 #define SCM_STACK_LENGTH(stack) (SCM_STACK (stack) -> length)
83 #define SCM_FRAMEP(obj) (SCM_CONSP (obj) \
84 && SCM_STACKP (SCM_CAR (obj)) \
85 && SCM_INUMP (SCM_CDR (obj))) \
88 #define SCM_FRAME_REF(frame, slot) \
89 (SCM_STACK (SCM_CAR (frame)) -> frames[SCM_INUM (SCM_CDR (frame))].slot) \
91 #define SCM_FRAME_NUMBER(frame) \
93 ? SCM_INUM (SCM_CDR (frame)) \
94 : (SCM_STACK_LENGTH (SCM_CAR (frame)) \
95 - SCM_INUM (SCM_CDR (frame)) \
98 #define SCM_FRAME_FLAGS(frame) SCM_FRAME_REF (frame, flags)
99 #define SCM_FRAME_SOURCE(frame) SCM_FRAME_REF (frame, source)
100 #define SCM_FRAME_PROC(frame) SCM_FRAME_REF (frame, proc)
101 #define SCM_FRAME_ARGS(frame) SCM_FRAME_REF (frame, args)
102 #define SCM_FRAME_PREV(frame) scm_frame_previous (frame)
103 #define SCM_FRAME_NEXT(frame) scm_frame_next (frame)
105 #define SCM_FRAMEF_VOID (1L << 2)
106 #define SCM_FRAMEF_REAL (1L << 3)
107 #define SCM_FRAMEF_PROC (1L << 4)
108 #define SCM_FRAMEF_EVAL_ARGS (1L << 5)
109 #define SCM_FRAMEF_OVERFLOW (1L << 6)
111 #define SCM_FRAME_VOID_P(frame) (SCM_BITS (SCM_FRAME_FLAGS (frame)) & SCM_FRAMEF_VOID)
112 #define SCM_FRAME_REAL_P(frame) (SCM_BITS (SCM_FRAME_FLAGS (frame)) & SCM_FRAMEF_REAL)
113 #define SCM_FRAME_PROC_P(frame) (SCM_BITS (SCM_FRAME_FLAGS (frame)) & SCM_FRAMEF_PROC)
114 #define SCM_FRAME_EVAL_ARGS_P(frame) (SCM_BITS (SCM_FRAME_FLAGS (frame)) & SCM_FRAMEF_EVAL_ARGS)
115 #define SCM_FRAME_OVERFLOW_P(frame) (SCM_BITS (SCM_FRAME_FLAGS (frame)) & SCM_FRAMEF_OVERFLOW)
119 SCM
scm_stack_p (SCM obj
);
120 SCM
scm_make_stack (SCM args
);
121 SCM
scm_stack_id (SCM stack
);
122 SCM
scm_stack_ref (SCM stack
, SCM i
);
123 SCM
scm_stack_length (SCM stack
);
125 SCM
scm_frame_p (SCM obj
);
126 SCM
scm_last_stack_frame (SCM obj
);
127 SCM
scm_frame_number (SCM frame
);
128 SCM
scm_frame_source (SCM frame
);
129 SCM
scm_frame_procedure (SCM frame
);
130 SCM
scm_frame_arguments (SCM frame
);
131 SCM
scm_frame_previous (SCM frame
);
132 SCM
scm_frame_next (SCM frame
);
133 SCM
scm_frame_real_p (SCM frame
);
134 SCM
scm_frame_procedure_p (SCM frame
);
135 SCM
scm_frame_evaluating_args_p (SCM frame
);
136 SCM
scm_frame_overflow_p (SCM frame
);
139 void scm_init_stacks (void);