5 /* Copyright (C) 1995,1996 Mikael Djurfeldt
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, 675 Mass Ave, Cambridge, MA 02139, USA.
21 * As a special exception, the Free Software Foundation gives permission
22 * for additional uses of the text contained in its release of GUILE.
24 * The exception is that, if you link the GUILE library with other files
25 * to produce an executable, this does not by itself cause the
26 * resulting executable to be covered by the GNU General Public License.
27 * Your use of that executable is in no way restricted on account of
28 * linking the GUILE library code into it.
30 * This exception does not however invalidate any other reasons why
31 * the executable file might be covered by the GNU General Public License.
33 * This exception applies only to the code released by the
34 * Free Software Foundation under the name GUILE. If you copy
35 * code from other Free Software Foundation releases into a copy of
36 * GUILE, as the General Public License permits, the exception does
37 * not apply to the code that you add in this way. To avoid misleading
38 * anyone as to the status of such modified files, you must delete
39 * this exception notice from them.
41 * If you write modifications of your own for GUILE, it is your choice
42 * whether to permit this exception to apply to your modifications.
43 * If you do not wish that, delete this exception notice.
45 * The author can be reached at djurfeldt@nada.kth.se
46 * Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN
50 #include "libguile/__scm.h"
52 /* {Frames and stacks}
55 typedef struct scm_info_frame
{
61 #define SCM_FRAME_N_SLOTS (sizeof (scm_info_frame) / sizeof (SCM))
63 #define SCM_STACK(obj) ((scm_stack *) SCM_STRUCT_DATA (obj))
64 #define SCM_STACK_LAYOUT "pwuourpW"
65 typedef struct scm_stack
{
66 SCM id
; /* Stack id */
67 scm_info_frame
*frames
; /* Info frames */
68 unsigned int length
; /* Stack length */
69 unsigned int tail_length
;
70 scm_info_frame tail
[1];
73 extern SCM scm_stack_type
;
75 #define SCM_STACKP(obj) (SCM_STRUCTP (obj) && SCM_STRUCT_VTABLE (obj) == scm_stack_type)
76 #define SCM_STACK_LENGTH(stack) (SCM_STACK (stack) -> length)
78 #define SCM_FRAMEP(obj) (SCM_CONSP (obj) \
79 && SCM_NIMP (SCM_CAR (obj)) \
80 && SCM_STACKP (SCM_CAR (obj)) \
81 && SCM_INUMP (SCM_CDR (obj))) \
84 #define SCM_FRAME_REF(frame, slot) \
85 (SCM_STACK (SCM_CAR (frame)) -> frames[SCM_INUM (SCM_CDR (frame))].slot) \
87 #define SCM_FRAME_NUMBER(frame) \
89 ? SCM_INUM (SCM_CDR (frame)) \
90 : (SCM_STACK_LENGTH (SCM_CAR (frame)) \
91 - SCM_INUM (SCM_CDR (frame)) \
94 #define SCM_FRAME_FLAGS(frame) SCM_FRAME_REF (frame, flags)
95 #define SCM_FRAME_SOURCE(frame) SCM_FRAME_REF (frame, source)
96 #define SCM_FRAME_PROC(frame) SCM_FRAME_REF (frame, proc)
97 #define SCM_FRAME_ARGS(frame) SCM_FRAME_REF (frame, args)
98 #define SCM_FRAME_PREV(frame) scm_frame_previous (frame)
99 #define SCM_FRAME_NEXT(frame) scm_frame_next (frame)
101 #define SCM_FRAMEF_VOID (1L << 2)
102 #define SCM_FRAMEF_REAL (1L << 3)
103 #define SCM_FRAMEF_PROC (1L << 4)
104 #define SCM_FRAMEF_EVAL_ARGS (1L << 5)
105 #define SCM_FRAMEF_OVERFLOW (1L << 6)
107 #define SCM_FRAME_VOID_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_VOID)
108 #define SCM_FRAME_REAL_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_REAL)
109 #define SCM_FRAME_PROC_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_PROC)
110 #define SCM_FRAME_EVAL_ARGS_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_EVAL_ARGS)
111 #define SCM_FRAME_OVERFLOW_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_OVERFLOW)
115 SCM scm_stack_p
SCM_P ((SCM obj
));
116 SCM scm_make_stack
SCM_P ((SCM args
));
117 SCM scm_stack_ref
SCM_P ((SCM stack
, SCM i
));
118 SCM scm_stack_length
SCM_P ((SCM stack
));
120 SCM scm_frame_p
SCM_P ((SCM obj
));
121 SCM scm_last_stack_frame
SCM_P ((SCM obj
));
122 SCM scm_frame_number
SCM_P ((SCM frame
));
123 SCM scm_frame_source
SCM_P ((SCM frame
));
124 SCM scm_frame_procedure
SCM_P ((SCM frame
));
125 SCM scm_frame_arguments
SCM_P ((SCM frame
));
126 SCM scm_frame_previous
SCM_P ((SCM frame
));
127 SCM scm_frame_next
SCM_P ((SCM frame
));
128 SCM scm_frame_real_p
SCM_P ((SCM frame
));
129 SCM scm_frame_procedure_p
SCM_P ((SCM frame
));
130 SCM scm_frame_evaluating_args_p
SCM_P ((SCM frame
));
131 SCM scm_frame_overflow_p
SCM_P ((SCM frame
));
133 void scm_init_stacks
SCM_P ((void));