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02aa5a4c MD |
1 | /* classes: h_files */ |
2 | ||
3 | #ifndef STACKSH | |
4 | #define STACKSH | |
1e598865 | 5 | /* Copyright (C) 1995,1996 Free Software Foundation |
02aa5a4c MD |
6 | * |
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) | |
10 | * any later version. | |
11 | * | |
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. | |
16 | * | |
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 | |
82892bed JB |
19 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
20 | * Boston, MA 02111-1307 USA | |
02aa5a4c MD |
21 | * |
22 | * As a special exception, the Free Software Foundation gives permission | |
23 | * for additional uses of the text contained in its release of GUILE. | |
24 | * | |
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. | |
30 | * | |
31 | * This exception does not however invalidate any other reasons why | |
32 | * the executable file might be covered by the GNU General Public License. | |
33 | * | |
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. | |
41 | * | |
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. | |
45 | * | |
46 | * The author can be reached at djurfeldt@nada.kth.se | |
82892bed | 47 | * Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN */ |
d3a6bc94 GB |
48 | |
49 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
50 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
02aa5a4c MD |
51 | \f |
52 | ||
53 | #include "libguile/__scm.h" | |
54 | ||
55 | /* {Frames and stacks} | |
56 | */ | |
57 | ||
58 | typedef struct scm_info_frame { | |
59 | SCM flags; | |
60 | SCM source; | |
61 | SCM proc; | |
62 | SCM args; | |
63 | } scm_info_frame; | |
64 | #define SCM_FRAME_N_SLOTS (sizeof (scm_info_frame) / sizeof (SCM)) | |
65 | ||
b902ec85 | 66 | #define SCM_STACK(obj) ((scm_stack *) SCM_STRUCT_DATA (obj)) |
3119346c | 67 | #define SCM_STACK_LAYOUT "pwuourpW" |
b902ec85 MD |
68 | typedef struct scm_stack { |
69 | SCM id; /* Stack id */ | |
c692c370 MD |
70 | scm_info_frame *frames; /* Info frames */ |
71 | unsigned int length; /* Stack length */ | |
3119346c | 72 | unsigned int tail_length; |
c692c370 | 73 | scm_info_frame tail[1]; |
b902ec85 MD |
74 | } scm_stack; |
75 | ||
76 | extern SCM scm_stack_type; | |
77 | ||
d3a6bc94 GB |
78 | #define SCM_STACKP(obj) (SCM_NIMP(obj) && \ |
79 | SCM_STRUCTP (obj) && SCM_STRUCT_VTABLE (obj) == scm_stack_type) | |
c692c370 | 80 | #define SCM_STACK_LENGTH(stack) (SCM_STACK (stack) -> length) |
02aa5a4c MD |
81 | |
82 | #define SCM_FRAMEP(obj) (SCM_CONSP (obj) \ | |
b902ec85 MD |
83 | && SCM_STACKP (SCM_CAR (obj)) \ |
84 | && SCM_INUMP (SCM_CDR (obj))) \ | |
85 | ||
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 | ||
110 | #define SCM_FRAME_VOID_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_VOID) | |
111 | #define SCM_FRAME_REAL_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_REAL) | |
112 | #define SCM_FRAME_PROC_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_PROC) | |
113 | #define SCM_FRAME_EVAL_ARGS_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_EVAL_ARGS) | |
114 | #define SCM_FRAME_OVERFLOW_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_OVERFLOW) | |
115 | ||
116 | \f | |
117 | ||
b902ec85 | 118 | SCM scm_stack_p SCM_P ((SCM obj)); |
f6f88e0d | 119 | SCM scm_make_stack SCM_P ((SCM args)); |
8a04c1a2 | 120 | SCM scm_stack_id SCM_P ((SCM stack)); |
02aa5a4c MD |
121 | SCM scm_stack_ref SCM_P ((SCM stack, SCM i)); |
122 | SCM scm_stack_length SCM_P ((SCM stack)); | |
123 | ||
b902ec85 | 124 | SCM scm_frame_p SCM_P ((SCM obj)); |
02aa5a4c MD |
125 | SCM scm_last_stack_frame SCM_P ((SCM obj)); |
126 | SCM scm_frame_number SCM_P ((SCM frame)); | |
127 | SCM scm_frame_source SCM_P ((SCM frame)); | |
128 | SCM scm_frame_procedure SCM_P ((SCM frame)); | |
129 | SCM scm_frame_arguments SCM_P ((SCM frame)); | |
130 | SCM scm_frame_previous SCM_P ((SCM frame)); | |
131 | SCM scm_frame_next SCM_P ((SCM frame)); | |
132 | SCM scm_frame_real_p SCM_P ((SCM frame)); | |
133 | SCM scm_frame_procedure_p SCM_P ((SCM frame)); | |
134 | SCM scm_frame_evaluating_args_p SCM_P ((SCM frame)); | |
135 | SCM scm_frame_overflow_p SCM_P ((SCM frame)); | |
136 | ||
8a04c1a2 | 137 | |
02aa5a4c MD |
138 | void scm_init_stacks SCM_P ((void)); |
139 | ||
140 | #endif /* STACKSH */ |