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02aa5a4c MD |
1 | /* classes: h_files */ |
2 | ||
13dcb666 DH |
3 | #ifndef SCM_STACKS_H |
4 | #define SCM_STACKS_H | |
b29058ff DH |
5 | |
6 | /* Copyright (C) 1995,1996,2000,2001 Free Software Foundation, Inc. | |
7 | * | |
02aa5a4c MD |
8 | * This program is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2, or (at your option) | |
11 | * any later version. | |
b29058ff | 12 | * |
02aa5a4c MD |
13 | * This program 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 | |
16 | * GNU General Public License for more details. | |
b29058ff | 17 | * |
02aa5a4c MD |
18 | * You should have received a copy of the GNU General Public License |
19 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
20 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
21 | * Boston, MA 02111-1307 USA | |
02aa5a4c MD |
22 | * |
23 | * As a special exception, the Free Software Foundation gives permission | |
24 | * for additional uses of the text contained in its release of GUILE. | |
25 | * | |
26 | * The exception is that, if you link the GUILE library with other files | |
27 | * to produce an executable, this does not by itself cause the | |
28 | * resulting executable to be covered by the GNU General Public License. | |
29 | * Your use of that executable is in no way restricted on account of | |
30 | * linking the GUILE library code into it. | |
31 | * | |
32 | * This exception does not however invalidate any other reasons why | |
33 | * the executable file might be covered by the GNU General Public License. | |
34 | * | |
35 | * This exception applies only to the code released by the | |
36 | * Free Software Foundation under the name GUILE. If you copy | |
37 | * code from other Free Software Foundation releases into a copy of | |
38 | * GUILE, as the General Public License permits, the exception does | |
39 | * not apply to the code that you add in this way. To avoid misleading | |
40 | * anyone as to the status of such modified files, you must delete | |
41 | * this exception notice from them. | |
42 | * | |
43 | * If you write modifications of your own for GUILE, it is your choice | |
44 | * whether to permit this exception to apply to your modifications. | |
45 | * If you do not wish that, delete this exception notice. | |
46 | * | |
47 | * The author can be reached at djurfeldt@nada.kth.se | |
82892bed | 48 | * Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN */ |
d3a6bc94 | 49 | |
02aa5a4c MD |
50 | \f |
51 | ||
52 | #include "libguile/__scm.h" | |
53 | ||
54 | /* {Frames and stacks} | |
55 | */ | |
56 | ||
92c2555f | 57 | typedef struct scm_t_info_frame { |
7febb4a2 | 58 | /* SCM flags; */ |
92c2555f | 59 | scm_t_bits flags; |
02aa5a4c MD |
60 | SCM source; |
61 | SCM proc; | |
62 | SCM args; | |
92c2555f MV |
63 | } scm_t_info_frame; |
64 | #define SCM_FRAME_N_SLOTS (sizeof (scm_t_info_frame) / sizeof (SCM)) | |
02aa5a4c | 65 | |
92c2555f | 66 | #define SCM_STACK(obj) ((scm_t_stack *) SCM_STRUCT_DATA (obj)) |
3119346c | 67 | #define SCM_STACK_LAYOUT "pwuourpW" |
92c2555f | 68 | typedef struct scm_t_stack { |
b902ec85 | 69 | SCM id; /* Stack id */ |
92c2555f | 70 | scm_t_info_frame *frames; /* Info frames */ |
c014a02e ML |
71 | unsigned long length; /* Stack length */ |
72 | unsigned long tail_length; | |
92c2555f MV |
73 | scm_t_info_frame tail[1]; |
74 | } scm_t_stack; | |
1be6b49c | 75 | |
33b001fd | 76 | SCM_API SCM scm_t_stackype; |
b902ec85 | 77 | |
92c2555f | 78 | #define SCM_STACKP(obj) (SCM_STRUCTP (obj) && SCM_EQ_P (SCM_STRUCT_VTABLE (obj), scm_t_stackype)) |
c692c370 | 79 | #define SCM_STACK_LENGTH(stack) (SCM_STACK (stack) -> length) |
02aa5a4c | 80 | |
13dcb666 DH |
81 | #define SCM_FRAMEP(obj) \ |
82 | (SCM_CONSP (obj) && SCM_STACKP (SCM_CAR (obj)) \ | |
83 | && SCM_INUMP (SCM_CDR (obj)) && SCM_INUM (SCM_CDR (obj)) >= 0 \ | |
84 | && ((unsigned long int) SCM_INUM (SCM_CDR (obj)) \ | |
85 | < SCM_STACK_LENGTH (SCM_CAR (obj)))) | |
b902ec85 MD |
86 | |
87 | #define SCM_FRAME_REF(frame, slot) \ | |
88 | (SCM_STACK (SCM_CAR (frame)) -> frames[SCM_INUM (SCM_CDR (frame))].slot) \ | |
89 | ||
90 | #define SCM_FRAME_NUMBER(frame) \ | |
91 | (SCM_BACKWARDS_P \ | |
92 | ? SCM_INUM (SCM_CDR (frame)) \ | |
93 | : (SCM_STACK_LENGTH (SCM_CAR (frame)) \ | |
94 | - SCM_INUM (SCM_CDR (frame)) \ | |
95 | - 1)) \ | |
96 | ||
97 | #define SCM_FRAME_FLAGS(frame) SCM_FRAME_REF (frame, flags) | |
98 | #define SCM_FRAME_SOURCE(frame) SCM_FRAME_REF (frame, source) | |
99 | #define SCM_FRAME_PROC(frame) SCM_FRAME_REF (frame, proc) | |
100 | #define SCM_FRAME_ARGS(frame) SCM_FRAME_REF (frame, args) | |
02aa5a4c MD |
101 | #define SCM_FRAME_PREV(frame) scm_frame_previous (frame) |
102 | #define SCM_FRAME_NEXT(frame) scm_frame_next (frame) | |
103 | ||
104 | #define SCM_FRAMEF_VOID (1L << 2) | |
105 | #define SCM_FRAMEF_REAL (1L << 3) | |
106 | #define SCM_FRAMEF_PROC (1L << 4) | |
107 | #define SCM_FRAMEF_EVAL_ARGS (1L << 5) | |
108 | #define SCM_FRAMEF_OVERFLOW (1L << 6) | |
109 | ||
451e591c DH |
110 | #define SCM_FRAME_VOID_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_VOID) |
111 | #define SCM_FRAME_REAL_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_REAL) | |
112 | #define SCM_FRAME_PROC_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_PROC) | |
113 | #define SCM_FRAME_EVAL_ARGS_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_EVAL_ARGS) | |
114 | #define SCM_FRAME_OVERFLOW_P(f) (SCM_FRAME_FLAGS (f) & SCM_FRAMEF_OVERFLOW) | |
02aa5a4c MD |
115 | |
116 | \f | |
117 | ||
33b001fd MV |
118 | SCM_API SCM scm_stack_p (SCM obj); |
119 | SCM_API SCM scm_make_stack (SCM obj, SCM args); | |
120 | SCM_API SCM scm_stack_id (SCM stack); | |
121 | SCM_API SCM scm_stack_ref (SCM stack, SCM i); | |
122 | SCM_API SCM scm_stack_length (SCM stack); | |
123 | ||
124 | SCM_API SCM scm_frame_p (SCM obj); | |
125 | SCM_API SCM scm_last_stack_frame (SCM obj); | |
126 | SCM_API SCM scm_frame_number (SCM frame); | |
127 | SCM_API SCM scm_frame_source (SCM frame); | |
128 | SCM_API SCM scm_frame_procedure (SCM frame); | |
129 | SCM_API SCM scm_frame_arguments (SCM frame); | |
130 | SCM_API SCM scm_frame_previous (SCM frame); | |
131 | SCM_API SCM scm_frame_next (SCM frame); | |
132 | SCM_API SCM scm_frame_real_p (SCM frame); | |
133 | SCM_API SCM scm_frame_procedure_p (SCM frame); | |
134 | SCM_API SCM scm_frame_evaluating_args_p (SCM frame); | |
135 | SCM_API SCM scm_frame_overflow_p (SCM frame); | |
136 | ||
137 | SCM_API void scm_init_stacks (void); | |
02aa5a4c | 138 | |
b29058ff | 139 | #endif /* SCM_STACKS_H */ |
89e00824 ML |
140 | |
141 | /* | |
142 | Local Variables: | |
143 | c-file-style: "gnu" | |
144 | End: | |
145 | */ |