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1 | /* classes: h_files */ |
2 | ||
3 | #ifndef STACKSH | |
4 | #define STACKSH | |
5 | /* Copyright (C) 1995,1996 Mikael Djurfeldt | |
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 | |
19 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | * | |
21 | * As a special exception, the Free Software Foundation gives permission | |
22 | * for additional uses of the text contained in its release of GUILE. | |
23 | * | |
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. | |
29 | * | |
30 | * This exception does not however invalidate any other reasons why | |
31 | * the executable file might be covered by the GNU General Public License. | |
32 | * | |
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. | |
40 | * | |
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. | |
44 | * | |
45 | * The author can be reached at djurfeldt@nada.kth.se | |
46 | * Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN | |
47 | */ | |
48 | \f | |
49 | ||
50 | #include "libguile/__scm.h" | |
51 | ||
52 | /* {Frames and stacks} | |
53 | */ | |
54 | ||
55 | typedef struct scm_info_frame { | |
56 | SCM flags; | |
57 | SCM source; | |
58 | SCM proc; | |
59 | SCM args; | |
60 | } scm_info_frame; | |
61 | #define SCM_FRAME_N_SLOTS (sizeof (scm_info_frame) / sizeof (SCM)) | |
62 | ||
63 | #define SCM_STACKP(obj) SCM_VECTORP (obj) | |
64 | #define SCM_STACK_LENGTH(stack) (SCM_LENGTH (stack) / SCM_FRAME_N_SLOTS) | |
65 | ||
66 | #define SCM_FRAMEP(obj) (SCM_CONSP (obj) \ | |
67 | && SCM_NIMP (SCM_CAR (frame)) \ | |
68 | && SCM_STACKP (SCM_CAR (frame)) \ | |
69 | && SCM_INUMP (SCM_CDR (frame))) \ | |
70 | ||
71 | ||
72 | /* Note that the following line contains a dependency on the | |
73 | representation of INUMs. */ | |
74 | #define SCM_FRAME_REF(frame, idx) (SCM_VELTS (SCM_CAR (frame))[(SCM_CDR (frame) & ~3L) + (idx)]) | |
75 | #define SCM_FRAME_NUMBER(frame) (SCM_BACKWARDS_P \ | |
76 | ? SCM_INUM (SCM_CDR (frame)) \ | |
77 | : (SCM_STACK_LENGTH (SCM_CAR (frame)) \ | |
78 | - SCM_INUM (SCM_CDR (frame)) \ | |
79 | - 1)) \ | |
80 | ||
81 | #define SCM_FRAME_FLAGS(frame) SCM_FRAME_REF (frame, 0) | |
82 | #define SCM_FRAME_SOURCE(frame) SCM_FRAME_REF (frame, 1) | |
83 | #define SCM_FRAME_PROC(frame) SCM_FRAME_REF (frame, 2) | |
84 | #define SCM_FRAME_ARGS(frame) SCM_FRAME_REF (frame, 3) | |
85 | #define SCM_FRAME_PREV(frame) scm_frame_previous (frame) | |
86 | #define SCM_FRAME_NEXT(frame) scm_frame_next (frame) | |
87 | ||
88 | #define SCM_FRAMEF_VOID (1L << 2) | |
89 | #define SCM_FRAMEF_REAL (1L << 3) | |
90 | #define SCM_FRAMEF_PROC (1L << 4) | |
91 | #define SCM_FRAMEF_EVAL_ARGS (1L << 5) | |
92 | #define SCM_FRAMEF_OVERFLOW (1L << 6) | |
93 | ||
94 | #define SCM_FRAME_VOID_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_VOID) | |
95 | #define SCM_FRAME_REAL_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_REAL) | |
96 | #define SCM_FRAME_PROC_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_PROC) | |
97 | #define SCM_FRAME_EVAL_ARGS_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_EVAL_ARGS) | |
98 | #define SCM_FRAME_OVERFLOW_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_OVERFLOW) | |
99 | ||
100 | \f | |
101 | ||
102 | SCM scm_make_stack SCM_P ((SCM obj, SCM inner_cut, SCM outer_cut)); | |
103 | SCM scm_stack_ref SCM_P ((SCM stack, SCM i)); | |
104 | SCM scm_stack_length SCM_P ((SCM stack)); | |
105 | ||
106 | SCM scm_last_stack_frame SCM_P ((SCM obj)); | |
107 | SCM scm_frame_number SCM_P ((SCM frame)); | |
108 | SCM scm_frame_source SCM_P ((SCM frame)); | |
109 | SCM scm_frame_procedure SCM_P ((SCM frame)); | |
110 | SCM scm_frame_arguments SCM_P ((SCM frame)); | |
111 | SCM scm_frame_previous SCM_P ((SCM frame)); | |
112 | SCM scm_frame_next SCM_P ((SCM frame)); | |
113 | SCM scm_frame_real_p SCM_P ((SCM frame)); | |
114 | SCM scm_frame_procedure_p SCM_P ((SCM frame)); | |
115 | SCM scm_frame_evaluating_args_p SCM_P ((SCM frame)); | |
116 | SCM scm_frame_overflow_p SCM_P ((SCM frame)); | |
117 | ||
118 | void scm_init_stacks SCM_P ((void)); | |
119 | ||
120 | #endif /* STACKSH */ |