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1edae076 MV |
1 | /* dynl.c - dynamic linking |
2 | * | |
96599e6a | 3 | * Copyright (C) 1990-1997 Free Software Foundation, Inc. |
1edae076 MV |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2, or (at your option) | |
8 | * any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
17 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
18 | * Boston, MA 02111-1307 USA | |
1edae076 MV |
19 | * |
20 | * As a special exception, the Free Software Foundation gives permission | |
21 | * for additional uses of the text contained in its release of GUILE. | |
22 | * | |
23 | * The exception is that, if you link the GUILE library with other files | |
24 | * to produce an executable, this does not by itself cause the | |
25 | * resulting executable to be covered by the GNU General Public License. | |
26 | * Your use of that executable is in no way restricted on account of | |
27 | * linking the GUILE library code into it. | |
28 | * | |
29 | * This exception does not however invalidate any other reasons why | |
30 | * the executable file might be covered by the GNU General Public License. | |
31 | * | |
32 | * This exception applies only to the code released by the | |
33 | * Free Software Foundation under the name GUILE. If you copy | |
34 | * code from other Free Software Foundation releases into a copy of | |
35 | * GUILE, as the General Public License permits, the exception does | |
36 | * not apply to the code that you add in this way. To avoid misleading | |
37 | * anyone as to the status of such modified files, you must delete | |
38 | * this exception notice from them. | |
39 | * | |
40 | * If you write modifications of your own for GUILE, it is your choice | |
41 | * whether to permit this exception to apply to your modifications. | |
82892bed | 42 | * If you do not wish that, delete this exception notice. */ |
1edae076 MV |
43 | |
44 | /* "dynl.c" dynamically link&load object files. | |
45 | Author: Aubrey Jaffer | |
46 | Modified for libguile by Marius Vollmer */ | |
47 | ||
80bc7890 MV |
48 | /* XXX - This is only here to drag in a definition of __eprintf. This |
49 | is needed for proper operation of dynamic linking. The real | |
50 | solution would probably be a shared libgcc. */ | |
51 | ||
52 | #undef NDEBUG | |
53 | #include <assert.h> | |
54 | ||
55 | static void | |
56 | maybe_drag_in_eprintf () | |
57 | { | |
58 | assert (!maybe_drag_in_eprintf); | |
59 | } | |
60 | ||
96599e6a | 61 | #include <stdio.h> |
1edae076 | 62 | #include "_scm.h" |
80bc7890 MV |
63 | #include "dynl.h" |
64 | #include "genio.h" | |
65 | #include "smob.h" | |
66 | ||
1edae076 MV |
67 | /* Converting a list of SCM strings into a argv-style array. You must |
68 | have ints disabled for the whole lifetime of the created argv (from | |
69 | before MAKE_ARGV_FROM_STRINGLIST until after | |
70 | MUST_FREE_ARGV). Atleast this is was the documentation for | |
71 | MAKARGVFROMSTRS says, it isn't really used that way. | |
72 | ||
73 | This code probably belongs into strings.c */ | |
74 | ||
75 | static char **scm_make_argv_from_stringlist SCM_P ((SCM args, int *argcp, | |
76 | char *subr, int argn)); | |
77 | ||
78 | static char ** | |
79 | scm_make_argv_from_stringlist (args, argcp, subr, argn) | |
80 | SCM args; | |
81 | int *argcp; | |
82 | char *subr; | |
83 | int argn; | |
84 | { | |
85 | char **argv; | |
86 | int argc, i; | |
87 | ||
88 | argc = scm_ilength(args); | |
89 | argv = (char **) scm_must_malloc ((1L+argc)*sizeof(char *), subr); | |
90 | for(i = 0; SCM_NNULLP (args); args = SCM_CDR (args), i++) { | |
91 | size_t len; | |
92 | char *dst, *src; | |
93 | SCM str = SCM_CAR (args); | |
94 | ||
95 | SCM_ASSERT (SCM_NIMP (str) && SCM_ROSTRINGP (str), str, argn, subr); | |
96 | len = 1 + SCM_ROLENGTH (str); | |
97 | dst = (char *) scm_must_malloc ((long)len, subr); | |
98 | src = SCM_ROCHARS (str); | |
99 | while (len--) | |
100 | dst[len] = src[len]; | |
101 | argv[i] = dst; | |
102 | } | |
103 | ||
104 | if (argcp) | |
105 | *argcp = argc; | |
106 | argv[argc] = 0; | |
107 | return argv; | |
108 | } | |
109 | ||
110 | static void scm_must_free_argv SCM_P ((char **argv)); | |
111 | ||
112 | static void | |
113 | scm_must_free_argv(argv) | |
114 | char **argv; | |
115 | { | |
116 | char **av = argv; | |
117 | while(!(*av)) | |
118 | free(*(av++)); | |
119 | free(argv); | |
120 | } | |
121 | ||
122 | /* Coerce an arbitrary readonly-string into a zero-terminated string. | |
123 | */ | |
124 | ||
125 | static SCM scm_coerce_rostring SCM_P ((SCM rostr, char *subr, int argn)); | |
126 | ||
127 | static SCM | |
128 | scm_coerce_rostring (rostr, subr, argn) | |
129 | SCM rostr; | |
130 | char *subr; | |
131 | int argn; | |
132 | { | |
133 | SCM_ASSERT (SCM_NIMP (rostr) && SCM_ROSTRINGP (rostr), rostr, argn, subr); | |
134 | if (SCM_SUBSTRP (rostr)) | |
135 | rostr = scm_makfromstr (SCM_ROCHARS (rostr), SCM_ROLENGTH (rostr), 0); | |
136 | return rostr; | |
137 | } | |
138 | ||
80bc7890 MV |
139 | /* Module registry |
140 | */ | |
141 | ||
142 | /* We can't use SCM objects here. One should be able to call | |
143 | SCM_REGISTER_MODULE from a C++ constructor for a static | |
144 | object. This happens before main and thus before libguile is | |
145 | initialized. */ | |
146 | ||
147 | struct moddata { | |
148 | struct moddata *link; | |
149 | char *module_name; | |
150 | void *init_func; | |
151 | }; | |
152 | ||
153 | static struct moddata *registered_mods = NULL; | |
154 | ||
155 | void | |
156 | scm_register_module_xxx (module_name, init_func) | |
157 | char *module_name; | |
158 | void *init_func; | |
159 | { | |
160 | struct moddata *md; | |
161 | ||
162 | /* XXX - should we (and can we) DEFER_INTS here? */ | |
163 | ||
164 | for (md = registered_mods; md; md = md->link) | |
165 | if (!strcmp (md->module_name, module_name)) { | |
166 | md->init_func = init_func; | |
167 | return; | |
168 | } | |
169 | ||
170 | md = (struct moddata *)malloc (sizeof (struct moddata)); | |
96599e6a MV |
171 | if (md == NULL) { |
172 | fprintf (stderr, | |
173 | "guile: can't register module (%s): not enough memory", | |
174 | module_name); | |
80bc7890 | 175 | return; |
96599e6a | 176 | } |
80bc7890 MV |
177 | |
178 | md->module_name = module_name; | |
179 | md->init_func = init_func; | |
180 | md->link = registered_mods; | |
181 | registered_mods = md; | |
182 | } | |
183 | ||
184 | SCM_PROC (s_registered_modules, "c-registered-modules", 0, 0, 0, scm_registered_modules); | |
185 | ||
186 | SCM | |
187 | scm_registered_modules () | |
188 | { | |
189 | SCM res; | |
190 | struct moddata *md; | |
191 | ||
192 | res = SCM_EOL; | |
193 | for (md = registered_mods; md; md = md->link) | |
194 | res = scm_cons (scm_cons (scm_makfrom0str (md->module_name), | |
195 | scm_ulong2num ((unsigned long) md->init_func)), | |
196 | res); | |
197 | return res; | |
198 | } | |
199 | ||
200 | SCM_PROC (s_clear_registered_modules, "c-clear-registered-modules", 0, 0, 0, scm_clear_registered_modules); | |
201 | ||
202 | SCM | |
203 | scm_clear_registered_modules () | |
204 | { | |
205 | struct moddata *md1, *md2; | |
206 | ||
207 | SCM_DEFER_INTS; | |
208 | ||
209 | for (md1 = registered_mods; md1; md1 = md2) { | |
210 | md2 = md1->link; | |
211 | free (md1); | |
212 | } | |
213 | registered_mods = NULL; | |
214 | ||
215 | SCM_ALLOW_INTS; | |
216 | return SCM_UNSPECIFIED; | |
217 | } | |
218 | ||
1edae076 | 219 | /* Dispatch to the system dependent files |
80bc7890 | 220 | * |
419e9e11 MV |
221 | * They define some static functions. These functions are called with |
222 | * deferred interrupts. When they want to throw errors, they are | |
223 | * expected to insert a SCM_ALLOW_INTS before doing the throw. It | |
224 | * might work to throw an error while interrupts are deferred (because | |
225 | * they will be unconditionally allowed the next time a SCM_ALLOW_INTS | |
226 | * is executed, SCM_DEFER_INTS and SCM_ALLOW_INTS do not nest). | |
1edae076 MV |
227 | */ |
228 | ||
80bc7890 MV |
229 | static void sysdep_dynl_init SCM_P ((void)); |
230 | static void *sysdep_dynl_link SCM_P ((char *filename, char *subr)); | |
231 | static void sysdep_dynl_unlink SCM_P ((void *handle, char *subr)); | |
232 | static void *sysdep_dynl_func SCM_P ((char *symbol, void *handle, char *subr)); | |
233 | ||
5ddca2ef | 234 | #if defined (HAVE_LIBDL) || defined (HAVE_DLOPEN) |
1edae076 MV |
235 | #include "dynl-dl.c" |
236 | #else | |
237 | #ifdef HAVE_SHL_LOAD | |
238 | #include "dynl-shl.c" | |
239 | #else | |
240 | #ifdef HAVE_DLD | |
241 | #include "dynl-dld.c" | |
96599e6a MV |
242 | #else |
243 | ||
244 | /* no dynamic linking available, throw errors. */ | |
245 | ||
246 | static void | |
247 | sysdep_dynl_init () | |
248 | { | |
249 | } | |
250 | ||
251 | static void | |
252 | no_dynl_error (subr) | |
253 | char *subr; | |
254 | { | |
419e9e11 MV |
255 | SCM_ALLOW_INTS; |
256 | scm_misc_error (subr, "dynamic linking not available", SCM_EOL); | |
96599e6a MV |
257 | } |
258 | ||
259 | static void * | |
260 | sysdep_dynl_link (filename, subr) | |
261 | char *filename; | |
262 | char *subr; | |
263 | { | |
264 | no_dynl_error (subr); | |
265 | return NULL; | |
266 | } | |
267 | ||
268 | static void | |
269 | sysdep_dynl_unlink (handle, subr) | |
270 | void *handle; | |
271 | char *subr; | |
272 | { | |
273 | no_dynl_error (subr); | |
274 | } | |
275 | ||
276 | static void * | |
277 | sysdep_dynl_func (symbol, handle, subr) | |
278 | char *symbol; | |
279 | void *handle; | |
280 | char *subr; | |
281 | { | |
282 | no_dynl_error (subr); | |
283 | return NULL; | |
284 | } | |
285 | ||
80bc7890 MV |
286 | #endif |
287 | #endif | |
288 | #endif | |
289 | ||
290 | int scm_tc16_dynamic_obj; | |
291 | ||
292 | struct dynl_obj { | |
293 | SCM filename; | |
294 | void *handle; | |
295 | }; | |
296 | ||
297 | static SCM mark_dynl_obj SCM_P ((SCM ptr)); | |
298 | static SCM | |
299 | mark_dynl_obj (ptr) | |
300 | SCM ptr; | |
301 | { | |
302 | struct dynl_obj *d = (struct dynl_obj *)SCM_CDR (ptr); | |
303 | SCM_SETGC8MARK (ptr); | |
304 | return d->filename; | |
305 | } | |
306 | ||
c487ad44 MV |
307 | static scm_sizet free_dynl_obj SCM_P ((SCM ptr)); |
308 | static scm_sizet | |
309 | free_dynl_obj (ptr) | |
310 | SCM ptr; | |
311 | { | |
312 | scm_must_free ((char *)SCM_CDR (ptr)); | |
313 | return sizeof (struct dynl_obj); | |
314 | } | |
315 | ||
80bc7890 MV |
316 | static int print_dynl_obj SCM_P ((SCM exp, SCM port, scm_print_state *pstate)); |
317 | static int | |
318 | print_dynl_obj (exp, port, pstate) | |
319 | SCM exp; | |
320 | SCM port; | |
321 | scm_print_state *pstate; | |
322 | { | |
323 | struct dynl_obj *d = (struct dynl_obj *)SCM_CDR (exp); | |
324 | scm_gen_puts (scm_regular_string, "#<dynamic-object ", port); | |
325 | scm_iprin1 (d->filename, port, pstate); | |
1fe1799f MV |
326 | if (d->handle == NULL) |
327 | scm_gen_puts (scm_regular_string, " (unlinked)", port); | |
80bc7890 MV |
328 | scm_gen_putc ('>', port); |
329 | return 1; | |
330 | } | |
331 | ||
332 | static scm_smobfuns dynl_obj_smob = { | |
333 | mark_dynl_obj, | |
c487ad44 | 334 | free_dynl_obj, |
80bc7890 MV |
335 | print_dynl_obj |
336 | }; | |
337 | ||
338 | SCM_PROC (s_dynamic_link, "dynamic-link", 1, 0, 0, scm_dynamic_link); | |
339 | ||
340 | SCM | |
341 | scm_dynamic_link (fname) | |
342 | SCM fname; | |
343 | { | |
344 | SCM z; | |
c487ad44 | 345 | void *handle; |
80bc7890 MV |
346 | struct dynl_obj *d; |
347 | ||
348 | fname = scm_coerce_rostring (fname, s_dynamic_link, SCM_ARG1); | |
c487ad44 MV |
349 | |
350 | SCM_DEFER_INTS; | |
351 | handle = sysdep_dynl_link (SCM_CHARS (fname), s_dynamic_link); | |
352 | ||
80bc7890 MV |
353 | d = (struct dynl_obj *)scm_must_malloc (sizeof (struct dynl_obj), |
354 | s_dynamic_link); | |
355 | d->filename = fname; | |
c487ad44 | 356 | d->handle = handle; |
80bc7890 | 357 | |
80bc7890 MV |
358 | SCM_NEWCELL (z); |
359 | SCM_SETCHARS (z, d); | |
360 | SCM_SETCAR (z, scm_tc16_dynamic_obj); | |
361 | SCM_ALLOW_INTS; | |
362 | ||
363 | return z; | |
364 | } | |
365 | ||
366 | static struct dynl_obj *get_dynl_obj SCM_P ((SCM obj, char *subr, int argn)); | |
367 | static struct dynl_obj * | |
368 | get_dynl_obj (dobj, subr, argn) | |
369 | SCM dobj; | |
370 | char *subr; | |
371 | int argn; | |
372 | { | |
373 | struct dynl_obj *d; | |
374 | SCM_ASSERT (SCM_NIMP (dobj) && SCM_CAR (dobj) == scm_tc16_dynamic_obj, | |
375 | dobj, argn, subr); | |
376 | d = (struct dynl_obj *)SCM_CDR (dobj); | |
377 | SCM_ASSERT (d->handle != NULL, dobj, argn, subr); | |
378 | return d; | |
379 | } | |
380 | ||
381 | SCM_PROC (s_dynamic_object_p, "dynamic-object?", 1, 0, 0, scm_dynamic_object_p); | |
382 | ||
383 | SCM | |
384 | scm_dynamic_object_p (SCM obj) | |
385 | { | |
386 | return (SCM_NIMP (obj) && SCM_CAR (obj) == scm_tc16_dynamic_obj)? | |
387 | SCM_BOOL_T : SCM_BOOL_F; | |
388 | } | |
389 | ||
390 | SCM_PROC (s_dynamic_unlink, "dynamic-unlink", 1, 0, 0, scm_dynamic_unlink); | |
391 | ||
392 | SCM | |
393 | scm_dynamic_unlink (dobj) | |
394 | SCM dobj; | |
395 | { | |
396 | struct dynl_obj *d = get_dynl_obj (dobj, s_dynamic_unlink, SCM_ARG1); | |
419e9e11 | 397 | SCM_DEFER_INTS; |
80bc7890 MV |
398 | sysdep_dynl_unlink (d->handle, s_dynamic_unlink); |
399 | d->handle = NULL; | |
419e9e11 MV |
400 | SCM_ALLOW_INTS; |
401 | return SCM_UNSPECIFIED; | |
80bc7890 MV |
402 | } |
403 | ||
404 | SCM_PROC (s_dynamic_func, "dynamic-func", 2, 0, 0, scm_dynamic_func); | |
405 | ||
406 | SCM | |
407 | scm_dynamic_func (SCM symb, SCM dobj) | |
408 | { | |
409 | struct dynl_obj *d; | |
410 | void (*func) (); | |
411 | ||
412 | symb = scm_coerce_rostring (symb, s_dynamic_func, SCM_ARG1); | |
413 | d = get_dynl_obj (dobj, s_dynamic_func, SCM_ARG2); | |
414 | ||
419e9e11 | 415 | SCM_DEFER_INTS; |
cdbadcac JB |
416 | func = (void (*) ()) sysdep_dynl_func (SCM_CHARS (symb), d->handle, |
417 | s_dynamic_func); | |
419e9e11 MV |
418 | SCM_ALLOW_INTS; |
419 | ||
80bc7890 MV |
420 | return scm_ulong2num ((unsigned long)func); |
421 | } | |
422 | ||
423 | SCM_PROC (s_dynamic_call, "dynamic-call", 2, 0, 0, scm_dynamic_call); | |
424 | ||
425 | SCM | |
426 | scm_dynamic_call (SCM func, SCM dobj) | |
427 | { | |
428 | void (*fptr)(); | |
429 | ||
430 | if (SCM_NIMP (func) && SCM_ROSTRINGP (func)) | |
431 | func = scm_dynamic_func (func, dobj); | |
432 | fptr = (void (*)()) scm_num2ulong (func, (char *)SCM_ARG1, s_dynamic_call); | |
419e9e11 | 433 | SCM_DEFER_INTS; |
80bc7890 | 434 | fptr (); |
419e9e11 MV |
435 | SCM_ALLOW_INTS; |
436 | return SCM_UNSPECIFIED; | |
80bc7890 MV |
437 | } |
438 | ||
439 | SCM_PROC (s_dynamic_args_call, "dynamic-args-call", 3, 0, 0, scm_dynamic_args_call); | |
440 | ||
441 | SCM | |
442 | scm_dynamic_args_call (func, dobj, args) | |
443 | SCM func, dobj, args; | |
444 | { | |
445 | int (*fptr) (int argc, char **argv); | |
446 | int result, argc; | |
447 | char **argv; | |
448 | ||
449 | if (SCM_NIMP (func) && SCM_ROSTRINGP (func)) | |
450 | func = scm_dynamic_func (func, dobj); | |
451 | ||
452 | fptr = (int (*)(int, char **)) scm_num2ulong (func, (char *)SCM_ARG1, | |
453 | s_dynamic_args_call); | |
419e9e11 | 454 | SCM_DEFER_INTS; |
80bc7890 MV |
455 | argv = scm_make_argv_from_stringlist (args, &argc, s_dynamic_args_call, |
456 | SCM_ARG3); | |
80bc7890 | 457 | result = (*fptr) (argc, argv); |
80bc7890 | 458 | scm_must_free_argv (argv); |
419e9e11 MV |
459 | SCM_ALLOW_INTS; |
460 | ||
80bc7890 MV |
461 | return SCM_MAKINUM(0L+result); |
462 | } | |
463 | ||
1edae076 MV |
464 | void |
465 | scm_init_dynamic_linking () | |
466 | { | |
80bc7890 MV |
467 | scm_tc16_dynamic_obj = scm_newsmob (&dynl_obj_smob); |
468 | sysdep_dynl_init (); | |
469 | #include "dynl.x" | |
1edae076 | 470 | } |