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0fc9040f | 1 | /* Copyright (C) 2001, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. |
ac99cb0c | 2 | * |
560b9c25 | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
ac99cb0c | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
560b9c25 AW |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
ac99cb0c | 12 | * |
560b9c25 AW |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
560b9c25 | 17 | */ |
ac99cb0c | 18 | |
13c47753 AW |
19 | #if HAVE_CONFIG_H |
20 | # include <config.h> | |
21 | #endif | |
22 | ||
da8b4747 | 23 | #include <stdlib.h> |
ac99cb0c | 24 | #include <string.h> |
560b9c25 | 25 | #include "_scm.h" |
ac99cb0c | 26 | #include "frames.h" |
0fc9040f LC |
27 | #include <verify.h> |
28 | ||
29 | /* Make sure assumptions on the layout of `struct scm_vm_frame' hold. */ | |
30 | verify (sizeof (SCM) == sizeof (SCM *)); | |
31 | verify (sizeof (struct scm_vm_frame) == 5 * sizeof (SCM)); | |
32 | verify (offsetof (struct scm_vm_frame, dynamic_link) == 0); | |
ac99cb0c KN |
33 | |
34 | \f | |
0fc9040f LC |
35 | #define RELOC(frame, val) \ |
36 | (((SCM *) (val)) + SCM_VM_FRAME_OFFSET (frame)) | |
ac99cb0c KN |
37 | |
38 | SCM | |
aa3f6951 AW |
39 | scm_c_make_frame (SCM stack_holder, SCM *fp, SCM *sp, |
40 | scm_t_uint8 *ip, scm_t_ptrdiff offset) | |
ac99cb0c | 41 | { |
aa3f6951 AW |
42 | struct scm_frame *p = scm_gc_malloc (sizeof (struct scm_frame), |
43 | "vmframe"); | |
b1b942b7 AW |
44 | p->stack_holder = stack_holder; |
45 | p->fp = fp; | |
46 | p->sp = sp; | |
47 | p->ip = ip; | |
48 | p->offset = offset; | |
6f3b0cc2 | 49 | return scm_cell (scm_tc7_frame, (scm_t_bits)p); |
ac99cb0c KN |
50 | } |
51 | ||
6f3b0cc2 AW |
52 | void |
53 | scm_i_frame_print (SCM frame, SCM port, scm_print_state *pstate) | |
2f9769b6 | 54 | { |
aa3f6951 | 55 | scm_puts ("#<frame ", port); |
2f9769b6 AW |
56 | scm_uintprint (SCM_UNPACK (frame), 16, port); |
57 | scm_putc (' ', port); | |
aa3f6951 | 58 | scm_write (scm_frame_procedure (frame), port); |
2f9769b6 AW |
59 | /* don't write args, they can get us into trouble. */ |
60 | scm_puts (">", port); | |
2f9769b6 AW |
61 | } |
62 | ||
3d94d862 | 63 | \f |
ac99cb0c KN |
64 | /* Scheme interface */ |
65 | ||
aa3f6951 | 66 | SCM_DEFINE (scm_frame_p, "frame?", 1, 0, 0, |
ac99cb0c KN |
67 | (SCM obj), |
68 | "") | |
aa3f6951 | 69 | #define FUNC_NAME s_scm_frame_p |
ac99cb0c | 70 | { |
5c8cefe5 | 71 | return scm_from_bool (SCM_VM_FRAME_P (obj)); |
b1b942b7 AW |
72 | } |
73 | #undef FUNC_NAME | |
74 | ||
aa3f6951 | 75 | SCM_DEFINE (scm_frame_procedure, "frame-procedure", 1, 0, 0, |
b1b942b7 AW |
76 | (SCM frame), |
77 | "") | |
aa3f6951 | 78 | #define FUNC_NAME s_scm_frame_procedure |
b1b942b7 AW |
79 | { |
80 | SCM_VALIDATE_VM_FRAME (1, frame); | |
81 | return SCM_FRAME_PROGRAM (SCM_VM_FRAME_FP (frame)); | |
82 | } | |
83 | #undef FUNC_NAME | |
84 | ||
aa3f6951 AW |
85 | SCM_DEFINE (scm_frame_arguments, "frame-arguments", 1, 0, 0, |
86 | (SCM frame), | |
87 | "") | |
88 | #define FUNC_NAME s_scm_frame_arguments | |
b1b942b7 | 89 | { |
6c6a4439 | 90 | static SCM var = SCM_BOOL_F; |
b1b942b7 AW |
91 | |
92 | SCM_VALIDATE_VM_FRAME (1, frame); | |
93 | ||
6c6a4439 AW |
94 | if (scm_is_false (var)) |
95 | var = scm_c_module_lookup (scm_c_resolve_module ("system vm frame"), | |
aa3f6951 | 96 | "frame-arguments"); |
b1b942b7 | 97 | |
6c6a4439 | 98 | return scm_call_1 (SCM_VARIABLE_REF (var), frame); |
ac99cb0c KN |
99 | } |
100 | #undef FUNC_NAME | |
101 | ||
423fca76 AW |
102 | SCM_DEFINE (scm_frame_source, "frame-source", 1, 0, 0, |
103 | (SCM frame), | |
104 | "") | |
105 | #define FUNC_NAME s_scm_frame_source | |
ac99cb0c | 106 | { |
423fca76 | 107 | SCM_VALIDATE_VM_FRAME (1, frame); |
b1b942b7 | 108 | |
423fca76 AW |
109 | return scm_program_source (scm_frame_procedure (frame), |
110 | scm_frame_instruction_pointer (frame), | |
111 | SCM_UNDEFINED); | |
ac99cb0c | 112 | } |
423fca76 | 113 | #undef FUNC_NAME |
ac99cb0c | 114 | |
6c6a4439 AW |
115 | /* The number of locals would be a simple thing to compute, if it weren't for |
116 | the presence of not-yet-active frames on the stack. So we have a cheap | |
117 | heuristic to detect not-yet-active frames, and skip over them. Perhaps we | |
118 | should represent them more usefully. | |
aa3f6951 AW |
119 | */ |
120 | SCM_DEFINE (scm_frame_num_locals, "frame-num-locals", 1, 0, 0, | |
6c6a4439 AW |
121 | (SCM frame), |
122 | "") | |
aa3f6951 | 123 | #define FUNC_NAME s_scm_frame_num_locals |
6c6a4439 AW |
124 | { |
125 | SCM *sp, *p; | |
126 | unsigned int n = 0; | |
127 | ||
128 | SCM_VALIDATE_VM_FRAME (1, frame); | |
129 | ||
130 | sp = SCM_VM_FRAME_SP (frame); | |
131 | p = SCM_FRAME_STACK_ADDRESS (SCM_VM_FRAME_FP (frame)); | |
132 | while (p <= sp) | |
133 | { | |
b2b33168 | 134 | if (SCM_UNPACK (p[0]) == 0) |
6c6a4439 AW |
135 | /* skip over not-yet-active frame */ |
136 | p += 3; | |
137 | else | |
138 | { | |
139 | p++; | |
140 | n++; | |
141 | } | |
142 | } | |
143 | return scm_from_uint (n); | |
144 | } | |
145 | #undef FUNC_NAME | |
146 | ||
aa3f6951 AW |
147 | /* Need same not-yet-active frame logic here as in frame-num-locals */ |
148 | SCM_DEFINE (scm_frame_local_ref, "frame-local-ref", 2, 0, 0, | |
af988bbf | 149 | (SCM frame, SCM index), |
ac99cb0c | 150 | "") |
aa3f6951 | 151 | #define FUNC_NAME s_scm_frame_local_ref |
ac99cb0c | 152 | { |
6c6a4439 AW |
153 | SCM *sp, *p; |
154 | unsigned int n = 0; | |
b1b942b7 | 155 | unsigned int i; |
b1b942b7 | 156 | |
6c6a4439 | 157 | SCM_VALIDATE_VM_FRAME (1, frame); |
b1b942b7 | 158 | SCM_VALIDATE_UINT_COPY (2, index, i); |
b1b942b7 | 159 | |
6c6a4439 AW |
160 | sp = SCM_VM_FRAME_SP (frame); |
161 | p = SCM_FRAME_STACK_ADDRESS (SCM_VM_FRAME_FP (frame)); | |
162 | while (p <= sp) | |
163 | { | |
b2b33168 | 164 | if (SCM_UNPACK (p[0]) == 0) |
6c6a4439 AW |
165 | /* skip over not-yet-active frame */ |
166 | p += 3; | |
167 | else if (n == i) | |
168 | return *p; | |
169 | else | |
170 | { | |
171 | p++; | |
172 | n++; | |
173 | } | |
174 | } | |
175 | SCM_OUT_OF_RANGE (SCM_ARG2, index); | |
af988bbf KN |
176 | } |
177 | #undef FUNC_NAME | |
ac99cb0c | 178 | |
aa3f6951 AW |
179 | /* Need same not-yet-active frame logic here as in frame-num-locals */ |
180 | SCM_DEFINE (scm_frame_local_set_x, "frame-local-set!", 3, 0, 0, | |
af988bbf KN |
181 | (SCM frame, SCM index, SCM val), |
182 | "") | |
aa3f6951 | 183 | #define FUNC_NAME s_scm_frame_local_set_x |
af988bbf | 184 | { |
6c6a4439 AW |
185 | SCM *sp, *p; |
186 | unsigned int n = 0; | |
b1b942b7 | 187 | unsigned int i; |
b1b942b7 | 188 | |
6c6a4439 | 189 | SCM_VALIDATE_VM_FRAME (1, frame); |
b1b942b7 | 190 | SCM_VALIDATE_UINT_COPY (2, index, i); |
b1b942b7 | 191 | |
6c6a4439 AW |
192 | sp = SCM_VM_FRAME_SP (frame); |
193 | p = SCM_FRAME_STACK_ADDRESS (SCM_VM_FRAME_FP (frame)); | |
194 | while (p <= sp) | |
195 | { | |
b2b33168 | 196 | if (SCM_UNPACK (p[0]) == 0) |
6c6a4439 AW |
197 | /* skip over not-yet-active frame */ |
198 | p += 3; | |
199 | else if (n == i) | |
200 | { | |
201 | *p = val; | |
202 | return SCM_UNSPECIFIED; | |
203 | } | |
204 | else | |
205 | { | |
206 | p++; | |
207 | n++; | |
208 | } | |
209 | } | |
210 | SCM_OUT_OF_RANGE (SCM_ARG2, index); | |
211 | } | |
212 | #undef FUNC_NAME | |
b1b942b7 | 213 | |
2e30f398 AW |
214 | SCM_DEFINE (scm_frame_address, "frame-address", 1, 0, 0, |
215 | (SCM frame), | |
216 | "Return the frame pointer for @var{frame}.") | |
217 | #define FUNC_NAME s_scm_frame_address | |
218 | { | |
219 | SCM_VALIDATE_VM_FRAME (1, frame); | |
3d27ef4b | 220 | return scm_from_unsigned_integer ((scm_t_bits) SCM_VM_FRAME_FP (frame)); |
2e30f398 AW |
221 | } |
222 | #undef FUNC_NAME | |
223 | ||
542f975e AW |
224 | SCM_DEFINE (scm_frame_stack_pointer, "frame-stack-pointer", 1, 0, 0, |
225 | (SCM frame), | |
226 | "") | |
227 | #define FUNC_NAME s_scm_frame_stack_pointer | |
228 | { | |
229 | SCM_VALIDATE_VM_FRAME (1, frame); | |
230 | ||
3d27ef4b | 231 | return scm_from_unsigned_integer ((scm_t_bits) SCM_VM_FRAME_SP (frame)); |
542f975e AW |
232 | } |
233 | #undef FUNC_NAME | |
234 | ||
aa3f6951 | 235 | SCM_DEFINE (scm_frame_instruction_pointer, "frame-instruction-pointer", 1, 0, 0, |
6c6a4439 AW |
236 | (SCM frame), |
237 | "") | |
aa3f6951 | 238 | #define FUNC_NAME s_scm_frame_instruction_pointer |
6c6a4439 | 239 | { |
67b699cc | 240 | SCM program; |
3dbbe28d LC |
241 | const struct scm_objcode *c_objcode; |
242 | ||
6c6a4439 | 243 | SCM_VALIDATE_VM_FRAME (1, frame); |
67b699cc | 244 | program = scm_frame_procedure (frame); |
3dbbe28d | 245 | |
67b699cc AW |
246 | if (!SCM_PROGRAM_P (program)) |
247 | return SCM_INUM0; | |
248 | ||
249 | c_objcode = SCM_PROGRAM_DATA (program); | |
3d27ef4b AW |
250 | return scm_from_unsigned_integer ((SCM_VM_FRAME_IP (frame) |
251 | - SCM_C_OBJCODE_BASE (c_objcode))); | |
ac99cb0c KN |
252 | } |
253 | #undef FUNC_NAME | |
254 | ||
aa3f6951 | 255 | SCM_DEFINE (scm_frame_return_address, "frame-return-address", 1, 0, 0, |
ac99cb0c KN |
256 | (SCM frame), |
257 | "") | |
aa3f6951 | 258 | #define FUNC_NAME s_scm_frame_return_address |
ac99cb0c | 259 | { |
b1b942b7 | 260 | SCM_VALIDATE_VM_FRAME (1, frame); |
3d27ef4b AW |
261 | return scm_from_unsigned_integer ((scm_t_bits) |
262 | (SCM_FRAME_RETURN_ADDRESS | |
263 | (SCM_VM_FRAME_FP (frame)))); | |
ac99cb0c KN |
264 | } |
265 | #undef FUNC_NAME | |
266 | ||
aa3f6951 | 267 | SCM_DEFINE (scm_frame_mv_return_address, "frame-mv-return-address", 1, 0, 0, |
da320011 AW |
268 | (SCM frame), |
269 | "") | |
aa3f6951 | 270 | #define FUNC_NAME s_scm_frame_mv_return_address |
da320011 | 271 | { |
b1b942b7 | 272 | SCM_VALIDATE_VM_FRAME (1, frame); |
3d27ef4b AW |
273 | return scm_from_unsigned_integer ((scm_t_bits) |
274 | (SCM_FRAME_MV_RETURN_ADDRESS | |
275 | (SCM_VM_FRAME_FP (frame)))); | |
da320011 AW |
276 | } |
277 | #undef FUNC_NAME | |
278 | ||
aa3f6951 | 279 | SCM_DEFINE (scm_frame_dynamic_link, "frame-dynamic-link", 1, 0, 0, |
ac99cb0c KN |
280 | (SCM frame), |
281 | "") | |
aa3f6951 | 282 | #define FUNC_NAME s_scm_frame_dynamic_link |
ac99cb0c | 283 | { |
b1b942b7 AW |
284 | SCM_VALIDATE_VM_FRAME (1, frame); |
285 | /* fixme: munge fp if holder is a continuation */ | |
286 | return scm_from_ulong | |
287 | ((unsigned long) | |
288 | RELOC (frame, | |
289 | SCM_FRAME_DYNAMIC_LINK (SCM_VM_FRAME_FP (frame)))); | |
ac99cb0c KN |
290 | } |
291 | #undef FUNC_NAME | |
292 | ||
93dbc31b AW |
293 | SCM_DEFINE (scm_frame_previous, "frame-previous", 1, 0, 0, |
294 | (SCM frame), | |
295 | "") | |
296 | #define FUNC_NAME s_scm_frame_previous | |
b1b942b7 AW |
297 | { |
298 | SCM *this_fp, *new_fp, *new_sp; | |
93dbc31b AW |
299 | |
300 | SCM_VALIDATE_VM_FRAME (1, frame); | |
301 | ||
302 | again: | |
b1b942b7 AW |
303 | this_fp = SCM_VM_FRAME_FP (frame); |
304 | new_fp = SCM_FRAME_DYNAMIC_LINK (this_fp); | |
305 | if (new_fp) | |
306 | { new_fp = RELOC (frame, new_fp); | |
307 | new_sp = SCM_FRAME_LOWER_ADDRESS (this_fp) - 1; | |
93dbc31b AW |
308 | frame = scm_c_make_frame (SCM_VM_FRAME_STACK_HOLDER (frame), |
309 | new_fp, new_sp, | |
310 | SCM_FRAME_RETURN_ADDRESS (this_fp), | |
311 | SCM_VM_FRAME_OFFSET (frame)); | |
312 | if (SCM_PROGRAM_IS_BOOT (scm_frame_procedure (frame))) | |
313 | goto again; | |
314 | else | |
315 | return frame; | |
b1b942b7 AW |
316 | } |
317 | else | |
318 | return SCM_BOOL_F; | |
319 | } | |
93dbc31b | 320 | #undef FUNC_NAME |
b1b942b7 | 321 | |
ac99cb0c | 322 | \f |
07e56b27 AW |
323 | void |
324 | scm_init_frames (void) | |
325 | { | |
ac99cb0c | 326 | #ifndef SCM_MAGIC_SNARFER |
aeeff258 | 327 | #include "libguile/frames.x" |
ac99cb0c KN |
328 | #endif |
329 | } | |
330 | ||
331 | /* | |
332 | Local Variables: | |
333 | c-file-style: "gnu" | |
334 | End: | |
335 | */ |