6 /* Copyright (C) 1995,1996,2000,2001, 2004, 2006 Free Software Foundation, Inc.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "libguile/__scm.h"
27 /* {Frames and stacks}
30 typedef struct scm_t_info_frame {
37 #define SCM_FRAME_N_SLOTS (sizeof (scm_t_info_frame) / sizeof (SCM))
39 #define SCM_STACK(obj) ((scm_t_stack *) SCM_STRUCT_DATA (obj))
40 #define SCM_STACK_LAYOUT "pwuourpW"
41 typedef struct scm_t_stack {
42 SCM id; /* Stack id */
43 scm_t_info_frame *frames; /* Info frames */
44 unsigned long length; /* Stack length */
45 unsigned long tail_length;
46 scm_t_info_frame tail[1];
49 SCM_API SCM scm_stack_type;
51 #define SCM_STACKP(obj) (SCM_STRUCTP (obj) && scm_is_eq (SCM_STRUCT_VTABLE (obj), scm_stack_type))
52 #define SCM_STACK_LENGTH(stack) (SCM_STACK (stack) -> length)
54 #define SCM_FRAMEP(obj) \
55 (scm_is_pair (obj) && SCM_STACKP (SCM_CAR (obj)) \
56 && scm_is_unsigned_integer (SCM_CDR (obj), \
57 0, SCM_STACK_LENGTH (SCM_CAR (obj))-1))
59 #define SCM_FRAME_REF(frame, slot) \
60 (SCM_STACK (SCM_CAR (frame)) -> frames[scm_to_size_t (SCM_CDR (frame))].slot)
62 #define SCM_FRAME_NUMBER(frame) \
64 ? scm_to_size_t (SCM_CDR (frame)) \
65 : (SCM_STACK_LENGTH (SCM_CAR (frame)) \
66 - scm_to_size_t (SCM_CDR (frame)) \
69 #define SCM_FRAME_FLAGS(frame) SCM_FRAME_REF (frame, flags)
70 #define SCM_FRAME_SOURCE(frame) SCM_FRAME_REF (frame, source)
71 #define SCM_FRAME_PROC(frame) SCM_FRAME_REF (frame, proc)
72 #define SCM_FRAME_ARGS(frame) SCM_FRAME_REF (frame, args)
73 #define SCM_FRAME_PREV(frame) scm_frame_previous (frame)
74 #define SCM_FRAME_NEXT(frame) scm_frame_next (frame)
76 #define SCM_FRAMEF_VOID (1L << 2)
77 #define SCM_FRAMEF_REAL (1L << 3)
78 #define SCM_FRAMEF_PROC (1L << 4)
79 #define SCM_FRAMEF_EVAL_ARGS (1L << 5)
80 #define SCM_FRAMEF_OVERFLOW (1L << 6)
82 #define SCM_FRAME_VOID_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_VOID)
83 #define SCM_FRAME_REAL_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_REAL)
84 #define SCM_FRAME_PROC_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_PROC)
85 #define SCM_FRAME_EVAL_ARGS_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_EVAL_ARGS)
86 #define SCM_FRAME_OVERFLOW_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_OVERFLOW)
90 SCM_API SCM scm_stack_p (SCM obj);
91 SCM_API SCM scm_make_stack (SCM obj, SCM args);
92 SCM_API SCM scm_stack_id (SCM stack);
93 SCM_API SCM scm_stack_ref (SCM stack, SCM i);
94 SCM_API SCM scm_stack_length (SCM stack);
96 SCM_API SCM scm_frame_p (SCM obj);
97 SCM_API SCM scm_last_stack_frame (SCM obj);
98 SCM_API SCM scm_frame_number (SCM frame);
99 SCM_API SCM scm_frame_source (SCM frame);
100 SCM_API SCM scm_frame_procedure (SCM frame);
101 SCM_API SCM scm_frame_arguments (SCM frame);
102 SCM_API SCM scm_frame_previous (SCM frame);
103 SCM_API SCM scm_frame_next (SCM frame);
104 SCM_API SCM scm_frame_real_p (SCM frame);
105 SCM_API SCM scm_frame_procedure_p (SCM frame);
106 SCM_API SCM scm_frame_evaluating_args_p (SCM frame);
107 SCM_API SCM scm_frame_overflow_p (SCM frame);
109 SCM_API void scm_init_stacks (void);
111 #endif /* SCM_STACKS_H */