Commit | Line | Data |
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1edae076 MV |
1 | /* dynl.c - dynamic linking |
2 | * | |
a80a90e9 | 3 | * Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999 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 | ||
104d4533 | 48 | #if 0 /* Disabled until we know for sure that it isn't needed */ |
80bc7890 MV |
49 | /* XXX - This is only here to drag in a definition of __eprintf. This |
50 | is needed for proper operation of dynamic linking. The real | |
51 | solution would probably be a shared libgcc. */ | |
52 | ||
53 | #undef NDEBUG | |
54 | #include <assert.h> | |
55 | ||
56 | static void | |
57 | maybe_drag_in_eprintf () | |
58 | { | |
59 | assert (!maybe_drag_in_eprintf); | |
60 | } | |
104d4533 | 61 | #endif |
80bc7890 | 62 | |
96599e6a | 63 | #include <stdio.h> |
1edae076 | 64 | #include "_scm.h" |
80bc7890 MV |
65 | #include "dynl.h" |
66 | #include "genio.h" | |
67 | #include "smob.h" | |
68 | ||
1edae076 MV |
69 | /* Converting a list of SCM strings into a argv-style array. You must |
70 | have ints disabled for the whole lifetime of the created argv (from | |
71 | before MAKE_ARGV_FROM_STRINGLIST until after | |
72 | MUST_FREE_ARGV). Atleast this is was the documentation for | |
73 | MAKARGVFROMSTRS says, it isn't really used that way. | |
74 | ||
75 | This code probably belongs into strings.c */ | |
76 | ||
77 | static char **scm_make_argv_from_stringlist SCM_P ((SCM args, int *argcp, | |
3eeba8d4 | 78 | const char *subr, int argn)); |
1edae076 MV |
79 | |
80 | static char ** | |
81 | scm_make_argv_from_stringlist (args, argcp, subr, argn) | |
82 | SCM args; | |
83 | int *argcp; | |
3eeba8d4 | 84 | const char *subr; |
1edae076 MV |
85 | int argn; |
86 | { | |
87 | char **argv; | |
88 | int argc, i; | |
89 | ||
90 | argc = scm_ilength(args); | |
91 | argv = (char **) scm_must_malloc ((1L+argc)*sizeof(char *), subr); | |
92 | for(i = 0; SCM_NNULLP (args); args = SCM_CDR (args), i++) { | |
93 | size_t len; | |
94 | char *dst, *src; | |
95 | SCM str = SCM_CAR (args); | |
96 | ||
97 | SCM_ASSERT (SCM_NIMP (str) && SCM_ROSTRINGP (str), str, argn, subr); | |
98 | len = 1 + SCM_ROLENGTH (str); | |
99 | dst = (char *) scm_must_malloc ((long)len, subr); | |
100 | src = SCM_ROCHARS (str); | |
101 | while (len--) | |
102 | dst[len] = src[len]; | |
103 | argv[i] = dst; | |
104 | } | |
105 | ||
106 | if (argcp) | |
107 | *argcp = argc; | |
108 | argv[argc] = 0; | |
109 | return argv; | |
110 | } | |
111 | ||
112 | static void scm_must_free_argv SCM_P ((char **argv)); | |
113 | ||
114 | static void | |
115 | scm_must_free_argv(argv) | |
116 | char **argv; | |
117 | { | |
118 | char **av = argv; | |
c3e09ef9 MD |
119 | while (*av) |
120 | free(*(av++)); | |
1edae076 MV |
121 | free(argv); |
122 | } | |
123 | ||
124 | /* Coerce an arbitrary readonly-string into a zero-terminated string. | |
125 | */ | |
126 | ||
3eeba8d4 | 127 | static SCM scm_coerce_rostring SCM_P ((SCM rostr, const char *subr, int argn)); |
1edae076 MV |
128 | |
129 | static SCM | |
130 | scm_coerce_rostring (rostr, subr, argn) | |
131 | SCM rostr; | |
3eeba8d4 | 132 | const char *subr; |
1edae076 MV |
133 | int argn; |
134 | { | |
135 | SCM_ASSERT (SCM_NIMP (rostr) && SCM_ROSTRINGP (rostr), rostr, argn, subr); | |
136 | if (SCM_SUBSTRP (rostr)) | |
137 | rostr = scm_makfromstr (SCM_ROCHARS (rostr), SCM_ROLENGTH (rostr), 0); | |
138 | return rostr; | |
139 | } | |
140 | ||
80bc7890 MV |
141 | /* Module registry |
142 | */ | |
143 | ||
144 | /* We can't use SCM objects here. One should be able to call | |
145 | SCM_REGISTER_MODULE from a C++ constructor for a static | |
146 | object. This happens before main and thus before libguile is | |
147 | initialized. */ | |
148 | ||
149 | struct moddata { | |
150 | struct moddata *link; | |
151 | char *module_name; | |
152 | void *init_func; | |
153 | }; | |
154 | ||
155 | static struct moddata *registered_mods = NULL; | |
156 | ||
157 | void | |
158 | scm_register_module_xxx (module_name, init_func) | |
159 | char *module_name; | |
160 | void *init_func; | |
161 | { | |
162 | struct moddata *md; | |
163 | ||
164 | /* XXX - should we (and can we) DEFER_INTS here? */ | |
165 | ||
166 | for (md = registered_mods; md; md = md->link) | |
167 | if (!strcmp (md->module_name, module_name)) { | |
168 | md->init_func = init_func; | |
169 | return; | |
170 | } | |
171 | ||
172 | md = (struct moddata *)malloc (sizeof (struct moddata)); | |
96599e6a MV |
173 | if (md == NULL) { |
174 | fprintf (stderr, | |
175 | "guile: can't register module (%s): not enough memory", | |
176 | module_name); | |
80bc7890 | 177 | return; |
96599e6a | 178 | } |
80bc7890 MV |
179 | |
180 | md->module_name = module_name; | |
181 | md->init_func = init_func; | |
182 | md->link = registered_mods; | |
183 | registered_mods = md; | |
184 | } | |
185 | ||
186 | SCM_PROC (s_registered_modules, "c-registered-modules", 0, 0, 0, scm_registered_modules); | |
187 | ||
188 | SCM | |
189 | scm_registered_modules () | |
190 | { | |
191 | SCM res; | |
192 | struct moddata *md; | |
193 | ||
194 | res = SCM_EOL; | |
195 | for (md = registered_mods; md; md = md->link) | |
196 | res = scm_cons (scm_cons (scm_makfrom0str (md->module_name), | |
197 | scm_ulong2num ((unsigned long) md->init_func)), | |
198 | res); | |
199 | return res; | |
200 | } | |
201 | ||
202 | SCM_PROC (s_clear_registered_modules, "c-clear-registered-modules", 0, 0, 0, scm_clear_registered_modules); | |
203 | ||
204 | SCM | |
205 | scm_clear_registered_modules () | |
206 | { | |
207 | struct moddata *md1, *md2; | |
208 | ||
209 | SCM_DEFER_INTS; | |
210 | ||
211 | for (md1 = registered_mods; md1; md1 = md2) { | |
212 | md2 = md1->link; | |
213 | free (md1); | |
214 | } | |
215 | registered_mods = NULL; | |
216 | ||
217 | SCM_ALLOW_INTS; | |
218 | return SCM_UNSPECIFIED; | |
219 | } | |
220 | ||
1edae076 | 221 | /* Dispatch to the system dependent files |
80bc7890 | 222 | * |
419e9e11 MV |
223 | * They define some static functions. These functions are called with |
224 | * deferred interrupts. When they want to throw errors, they are | |
225 | * expected to insert a SCM_ALLOW_INTS before doing the throw. It | |
226 | * might work to throw an error while interrupts are deferred (because | |
227 | * they will be unconditionally allowed the next time a SCM_ALLOW_INTS | |
228 | * is executed, SCM_DEFER_INTS and SCM_ALLOW_INTS do not nest). | |
1edae076 MV |
229 | */ |
230 | ||
80bc7890 | 231 | static void sysdep_dynl_init SCM_P ((void)); |
3eeba8d4 JB |
232 | static void *sysdep_dynl_link SCM_P ((const char *filename, const char *subr)); |
233 | static void sysdep_dynl_unlink SCM_P ((void *handle, const char *subr)); | |
234 | static void *sysdep_dynl_func SCM_P ((const char *symbol, void *handle, | |
235 | const char *subr)); | |
80bc7890 | 236 | |
26c41b99 | 237 | #ifdef HAVE_DLOPEN |
1edae076 MV |
238 | #include "dynl-dl.c" |
239 | #else | |
240 | #ifdef HAVE_SHL_LOAD | |
241 | #include "dynl-shl.c" | |
242 | #else | |
26c41b99 | 243 | #ifdef HAVE_LIBDLD |
1edae076 | 244 | #include "dynl-dld.c" |
96599e6a MV |
245 | #else |
246 | ||
247 | /* no dynamic linking available, throw errors. */ | |
248 | ||
249 | static void | |
250 | sysdep_dynl_init () | |
251 | { | |
252 | } | |
253 | ||
254 | static void | |
a80a90e9 | 255 | no_dynl_error (const char *subr) |
96599e6a | 256 | { |
419e9e11 MV |
257 | SCM_ALLOW_INTS; |
258 | scm_misc_error (subr, "dynamic linking not available", SCM_EOL); | |
96599e6a MV |
259 | } |
260 | ||
261 | static void * | |
a80a90e9 JB |
262 | sysdep_dynl_link (const char *filename, |
263 | const char *subr) | |
96599e6a MV |
264 | { |
265 | no_dynl_error (subr); | |
266 | return NULL; | |
267 | } | |
268 | ||
269 | static void | |
a80a90e9 JB |
270 | sysdep_dynl_unlink (void *handle, |
271 | const char *subr) | |
96599e6a MV |
272 | { |
273 | no_dynl_error (subr); | |
274 | } | |
275 | ||
276 | static void * | |
a80a90e9 JB |
277 | sysdep_dynl_func (const char *symbol, |
278 | void *handle, | |
279 | const char *subr) | |
96599e6a MV |
280 | { |
281 | no_dynl_error (subr); | |
282 | return NULL; | |
283 | } | |
284 | ||
80bc7890 MV |
285 | #endif |
286 | #endif | |
287 | #endif | |
288 | ||
289 | int scm_tc16_dynamic_obj; | |
290 | ||
291 | struct dynl_obj { | |
292 | SCM filename; | |
293 | void *handle; | |
294 | }; | |
295 | ||
296 | static SCM mark_dynl_obj SCM_P ((SCM ptr)); | |
297 | static SCM | |
298 | mark_dynl_obj (ptr) | |
299 | SCM ptr; | |
300 | { | |
301 | struct dynl_obj *d = (struct dynl_obj *)SCM_CDR (ptr); | |
80bc7890 MV |
302 | return d->filename; |
303 | } | |
304 | ||
c487ad44 MV |
305 | static scm_sizet free_dynl_obj SCM_P ((SCM ptr)); |
306 | static scm_sizet | |
307 | free_dynl_obj (ptr) | |
308 | SCM ptr; | |
309 | { | |
310 | scm_must_free ((char *)SCM_CDR (ptr)); | |
311 | return sizeof (struct dynl_obj); | |
312 | } | |
313 | ||
80bc7890 MV |
314 | static int print_dynl_obj SCM_P ((SCM exp, SCM port, scm_print_state *pstate)); |
315 | static int | |
316 | print_dynl_obj (exp, port, pstate) | |
317 | SCM exp; | |
318 | SCM port; | |
319 | scm_print_state *pstate; | |
320 | { | |
321 | struct dynl_obj *d = (struct dynl_obj *)SCM_CDR (exp); | |
b7f3516f | 322 | scm_puts ("#<dynamic-object ", port); |
80bc7890 | 323 | scm_iprin1 (d->filename, port, pstate); |
1fe1799f | 324 | if (d->handle == NULL) |
b7f3516f TT |
325 | scm_puts (" (unlinked)", port); |
326 | scm_putc ('>', port); | |
80bc7890 MV |
327 | return 1; |
328 | } | |
329 | ||
330 | static scm_smobfuns dynl_obj_smob = { | |
331 | mark_dynl_obj, | |
c487ad44 | 332 | free_dynl_obj, |
80bc7890 MV |
333 | print_dynl_obj |
334 | }; | |
335 | ||
336 | SCM_PROC (s_dynamic_link, "dynamic-link", 1, 0, 0, scm_dynamic_link); | |
337 | ||
338 | SCM | |
339 | scm_dynamic_link (fname) | |
340 | SCM fname; | |
341 | { | |
342 | SCM z; | |
c487ad44 | 343 | void *handle; |
80bc7890 MV |
344 | struct dynl_obj *d; |
345 | ||
346 | fname = scm_coerce_rostring (fname, s_dynamic_link, SCM_ARG1); | |
c487ad44 MV |
347 | |
348 | SCM_DEFER_INTS; | |
349 | handle = sysdep_dynl_link (SCM_CHARS (fname), s_dynamic_link); | |
350 | ||
80bc7890 MV |
351 | d = (struct dynl_obj *)scm_must_malloc (sizeof (struct dynl_obj), |
352 | s_dynamic_link); | |
353 | d->filename = fname; | |
c487ad44 | 354 | d->handle = handle; |
80bc7890 | 355 | |
80bc7890 MV |
356 | SCM_NEWCELL (z); |
357 | SCM_SETCHARS (z, d); | |
358 | SCM_SETCAR (z, scm_tc16_dynamic_obj); | |
359 | SCM_ALLOW_INTS; | |
360 | ||
361 | return z; | |
362 | } | |
363 | ||
3eeba8d4 | 364 | static struct dynl_obj *get_dynl_obj SCM_P ((SCM obj, const char *subr, int argn)); |
80bc7890 MV |
365 | static struct dynl_obj * |
366 | get_dynl_obj (dobj, subr, argn) | |
367 | SCM dobj; | |
3eeba8d4 | 368 | const char *subr; |
80bc7890 MV |
369 | int argn; |
370 | { | |
371 | struct dynl_obj *d; | |
372 | SCM_ASSERT (SCM_NIMP (dobj) && SCM_CAR (dobj) == scm_tc16_dynamic_obj, | |
373 | dobj, argn, subr); | |
374 | d = (struct dynl_obj *)SCM_CDR (dobj); | |
375 | SCM_ASSERT (d->handle != NULL, dobj, argn, subr); | |
376 | return d; | |
377 | } | |
378 | ||
379 | SCM_PROC (s_dynamic_object_p, "dynamic-object?", 1, 0, 0, scm_dynamic_object_p); | |
380 | ||
381 | SCM | |
382 | scm_dynamic_object_p (SCM obj) | |
383 | { | |
384 | return (SCM_NIMP (obj) && SCM_CAR (obj) == scm_tc16_dynamic_obj)? | |
385 | SCM_BOOL_T : SCM_BOOL_F; | |
386 | } | |
387 | ||
388 | SCM_PROC (s_dynamic_unlink, "dynamic-unlink", 1, 0, 0, scm_dynamic_unlink); | |
389 | ||
390 | SCM | |
391 | scm_dynamic_unlink (dobj) | |
392 | SCM dobj; | |
393 | { | |
394 | struct dynl_obj *d = get_dynl_obj (dobj, s_dynamic_unlink, SCM_ARG1); | |
419e9e11 | 395 | SCM_DEFER_INTS; |
80bc7890 MV |
396 | sysdep_dynl_unlink (d->handle, s_dynamic_unlink); |
397 | d->handle = NULL; | |
419e9e11 MV |
398 | SCM_ALLOW_INTS; |
399 | return SCM_UNSPECIFIED; | |
80bc7890 MV |
400 | } |
401 | ||
402 | SCM_PROC (s_dynamic_func, "dynamic-func", 2, 0, 0, scm_dynamic_func); | |
403 | ||
404 | SCM | |
405 | scm_dynamic_func (SCM symb, SCM dobj) | |
406 | { | |
407 | struct dynl_obj *d; | |
408 | void (*func) (); | |
409 | ||
410 | symb = scm_coerce_rostring (symb, s_dynamic_func, SCM_ARG1); | |
411 | d = get_dynl_obj (dobj, s_dynamic_func, SCM_ARG2); | |
412 | ||
419e9e11 | 413 | SCM_DEFER_INTS; |
cdbadcac JB |
414 | func = (void (*) ()) sysdep_dynl_func (SCM_CHARS (symb), d->handle, |
415 | s_dynamic_func); | |
419e9e11 MV |
416 | SCM_ALLOW_INTS; |
417 | ||
80bc7890 MV |
418 | return scm_ulong2num ((unsigned long)func); |
419 | } | |
420 | ||
421 | SCM_PROC (s_dynamic_call, "dynamic-call", 2, 0, 0, scm_dynamic_call); | |
422 | ||
423 | SCM | |
424 | scm_dynamic_call (SCM func, SCM dobj) | |
425 | { | |
426 | void (*fptr)(); | |
427 | ||
428 | if (SCM_NIMP (func) && SCM_ROSTRINGP (func)) | |
429 | func = scm_dynamic_func (func, dobj); | |
430 | fptr = (void (*)()) scm_num2ulong (func, (char *)SCM_ARG1, s_dynamic_call); | |
419e9e11 | 431 | SCM_DEFER_INTS; |
80bc7890 | 432 | fptr (); |
419e9e11 MV |
433 | SCM_ALLOW_INTS; |
434 | return SCM_UNSPECIFIED; | |
80bc7890 MV |
435 | } |
436 | ||
437 | SCM_PROC (s_dynamic_args_call, "dynamic-args-call", 3, 0, 0, scm_dynamic_args_call); | |
438 | ||
439 | SCM | |
440 | scm_dynamic_args_call (func, dobj, args) | |
441 | SCM func, dobj, args; | |
442 | { | |
443 | int (*fptr) (int argc, char **argv); | |
444 | int result, argc; | |
445 | char **argv; | |
446 | ||
447 | if (SCM_NIMP (func) && SCM_ROSTRINGP (func)) | |
448 | func = scm_dynamic_func (func, dobj); | |
449 | ||
450 | fptr = (int (*)(int, char **)) scm_num2ulong (func, (char *)SCM_ARG1, | |
451 | s_dynamic_args_call); | |
419e9e11 | 452 | SCM_DEFER_INTS; |
80bc7890 MV |
453 | argv = scm_make_argv_from_stringlist (args, &argc, s_dynamic_args_call, |
454 | SCM_ARG3); | |
80bc7890 | 455 | result = (*fptr) (argc, argv); |
80bc7890 | 456 | scm_must_free_argv (argv); |
419e9e11 MV |
457 | SCM_ALLOW_INTS; |
458 | ||
80bc7890 MV |
459 | return SCM_MAKINUM(0L+result); |
460 | } | |
461 | ||
1edae076 MV |
462 | void |
463 | scm_init_dynamic_linking () | |
464 | { | |
80bc7890 MV |
465 | scm_tc16_dynamic_obj = scm_newsmob (&dynl_obj_smob); |
466 | sysdep_dynl_init (); | |
467 | #include "dynl.x" | |
1edae076 | 468 | } |