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1 | /* Copyright (C) 2001 Free Software Foundation, Inc. |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this software; see the file COPYING. If not, write to | |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
16 | * Boston, MA 02111-1307 USA | |
17 | * | |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
40 | * If you do not wish that, delete this exception notice. */ | |
41 | ||
42 | #include <string.h> | |
43 | #include "frames.h" | |
44 | ||
45 | \f | |
46 | scm_bits_t scm_tc16_heap_frame; | |
47 | ||
48 | SCM | |
49 | scm_c_make_heap_frame (SCM *fp) | |
50 | { | |
51 | struct scm_heap_frame *p = | |
52 | scm_must_malloc (sizeof (struct scm_heap_frame), "make_heap_frame"); | |
53 | p->fp = fp; | |
54 | p->program = SCM_UNDEFINED; | |
55 | p->variables = SCM_UNDEFINED; | |
56 | p->dynamic_link = SCM_UNDEFINED; | |
57 | p->external_link = SCM_UNDEFINED; | |
58 | SCM_RETURN_NEWSMOB (scm_tc16_heap_frame, p); | |
59 | } | |
60 | ||
61 | static SCM | |
62 | heap_frame_mark (SCM obj) | |
63 | { | |
64 | struct scm_heap_frame *p = SCM_HEAP_FRAME_DATA (obj); | |
65 | scm_gc_mark (p->program); | |
66 | scm_gc_mark (p->variables); | |
67 | scm_gc_mark (p->dynamic_link); | |
68 | return p->external_link; | |
69 | } | |
70 | ||
71 | /* Scheme interface */ | |
72 | ||
73 | SCM_DEFINE (scm_frame_p, "frame?", 1, 0, 0, | |
74 | (SCM obj), | |
75 | "") | |
76 | #define FUNC_NAME s_scm_frame_p | |
77 | { | |
78 | return SCM_BOOL (SCM_HEAP_FRAME_P (obj)); | |
79 | } | |
80 | #undef FUNC_NAME | |
81 | ||
82 | SCM_DEFINE (scm_frame_program, "frame-program", 1, 0, 0, | |
83 | (SCM frame), | |
84 | "") | |
85 | #define FUNC_NAME s_scm_frame_program | |
86 | { | |
87 | SCM_VALIDATE_HEAP_FRAME (1, frame); | |
88 | return SCM_STACK_FRAME_PROGRAM (SCM_HEAP_FRAME_DATA (frame)->fp); | |
89 | } | |
90 | #undef FUNC_NAME | |
91 | ||
92 | SCM_DEFINE (scm_frame_local_variables, "frame-local-variables", 1, 0, 0, | |
93 | (SCM frame), | |
94 | "") | |
95 | #define FUNC_NAME s_scm_frame_local_variables | |
96 | { | |
97 | struct scm_heap_frame *p; | |
98 | ||
99 | SCM_VALIDATE_HEAP_FRAME (1, frame); | |
100 | p = SCM_HEAP_FRAME_DATA (frame); | |
101 | ||
102 | if (SCM_UNBNDP (p->variables)) | |
103 | { | |
104 | SCM prog = scm_frame_program (frame); | |
105 | struct scm_program *pp = SCM_PROGRAM_DATA (prog); | |
106 | int i, size = pp->nargs + pp->nlocs; | |
107 | p->variables = scm_make_vector (SCM_MAKINUM (size), SCM_BOOL_F); | |
108 | for (i = 0; i < size; i++) | |
109 | SCM_VELTS (p->variables)[i] = SCM_STACK_FRAME_VARIABLE (p->fp, i); | |
110 | } | |
111 | return p->variables; | |
112 | } | |
113 | #undef FUNC_NAME | |
114 | ||
115 | SCM_DEFINE (scm_frame_return_address, "frame-return-address", 1, 0, 0, | |
116 | (SCM frame), | |
117 | "") | |
118 | #define FUNC_NAME s_scm_frame_return_address | |
119 | { | |
120 | SCM_VALIDATE_HEAP_FRAME (1, frame); | |
121 | ||
122 | return scm_long2num ((long) SCM_VM_BYTE_ADDRESS | |
123 | (SCM_STACK_FRAME_RETURN_ADDRESS | |
124 | (SCM_HEAP_FRAME_DATA (frame)->fp))); | |
125 | } | |
126 | #undef FUNC_NAME | |
127 | ||
128 | SCM_DEFINE (scm_frame_dynamic_link, "frame-dynamic-link", 1, 0, 0, | |
129 | (SCM frame), | |
130 | "") | |
131 | #define FUNC_NAME s_scm_frame_dynamic_link | |
132 | { | |
133 | struct scm_heap_frame *p; | |
134 | ||
135 | SCM_VALIDATE_HEAP_FRAME (1, frame); | |
136 | p = SCM_HEAP_FRAME_DATA (frame); | |
137 | ||
138 | if (SCM_UNBNDP (p->dynamic_link)) | |
139 | { | |
140 | SCM *fp = SCM_VM_STACK_ADDRESS (SCM_STACK_FRAME_DYNAMIC_LINK (p->fp)); | |
141 | if (fp) | |
142 | p->dynamic_link = scm_c_make_heap_frame (fp); | |
143 | else | |
144 | p->dynamic_link = SCM_BOOL_F; | |
145 | } | |
146 | ||
147 | return p->dynamic_link; | |
148 | } | |
149 | #undef FUNC_NAME | |
150 | ||
151 | SCM_DEFINE (scm_frame_external_link, "frame-external-link", 1, 0, 0, | |
152 | (SCM frame), | |
153 | "") | |
154 | #define FUNC_NAME s_scm_frame_external_link | |
155 | { | |
156 | struct scm_heap_frame *p; | |
157 | ||
158 | SCM_VALIDATE_HEAP_FRAME (1, frame); | |
159 | p = SCM_HEAP_FRAME_DATA (frame); | |
160 | ||
161 | if (SCM_UNBNDP (p->external_link)) | |
162 | p->external_link = SCM_STACK_FRAME_EXTERNAL_LINK (p->fp); | |
163 | ||
164 | return p->external_link; | |
165 | } | |
166 | #undef FUNC_NAME | |
167 | ||
168 | \f | |
169 | void | |
170 | scm_init_frames (void) | |
171 | { | |
172 | scm_tc16_heap_frame = scm_make_smob_type ("heap_frame", 0); | |
173 | scm_set_smob_mark (scm_tc16_heap_frame, heap_frame_mark); | |
174 | ||
175 | #ifndef SCM_MAGIC_SNARFER | |
176 | #include "frames.x" | |
177 | #endif | |
178 | } | |
179 | ||
180 | /* | |
181 | Local Variables: | |
182 | c-file-style: "gnu" | |
183 | End: | |
184 | */ |