Commit | Line | Data |
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5d3236ee | 1 | /* Plugin control for the GNU linker. |
b90efa5b | 2 | Copyright (C) 2010-2015 Free Software Foundation, Inc. |
5d3236ee DK |
3 | |
4 | This file is part of the GNU Binutils. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
20 | ||
21 | #include "sysdep.h" | |
22 | #include "libiberty.h" | |
23 | #include "bfd.h" | |
24 | #include "bfdlink.h" | |
25 | #include "bfdver.h" | |
26 | #include "ld.h" | |
27 | #include "ldmain.h" | |
28 | #include "ldmisc.h" | |
29 | #include "ldexp.h" | |
30 | #include "ldlang.h" | |
31 | #include "ldfile.h" | |
32 | #include "plugin.h" | |
33 | #include "plugin-api.h" | |
34 | #include "elf-bfd.h" | |
f4b78d18 L |
35 | #include <errno.h> |
36 | #if !(defined(errno) || defined(_MSC_VER) && defined(_INC_ERRNO)) | |
37 | extern int errno; | |
38 | #endif | |
3917d5d5 | 39 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
f31d24a0 | 40 | #include <windows.h> |
3917d5d5 | 41 | #endif |
5d3236ee | 42 | |
1715a13c L |
43 | /* Report plugin symbols. */ |
44 | bfd_boolean report_plugin_symbols; | |
45 | ||
5d3236ee DK |
46 | /* The suffix to append to the name of the real (claimed) object file |
47 | when generating a dummy BFD to hold the IR symbols sent from the | |
cf4dc96f DK |
48 | plugin. For cosmetic use only; appears in maps, crefs etc. */ |
49 | #define IRONLY_SUFFIX " (symbol from plugin)" | |
5d3236ee DK |
50 | |
51 | /* Stores a single argument passed to a plugin. */ | |
52 | typedef struct plugin_arg | |
53 | { | |
54 | struct plugin_arg *next; | |
55 | const char *arg; | |
56 | } plugin_arg_t; | |
57 | ||
58 | /* Holds all details of a single plugin. */ | |
59 | typedef struct plugin | |
60 | { | |
61 | /* Next on the list of plugins, or NULL at end of chain. */ | |
62 | struct plugin *next; | |
63 | /* The argument string given to --plugin. */ | |
64 | const char *name; | |
65 | /* The shared library handle returned by dlopen. */ | |
66 | void *dlhandle; | |
67 | /* The list of argument string given to --plugin-opt. */ | |
68 | plugin_arg_t *args; | |
69 | /* Number of args in the list, for convenience. */ | |
70 | size_t n_args; | |
71 | /* The plugin's event handlers. */ | |
72 | ld_plugin_claim_file_handler claim_file_handler; | |
73 | ld_plugin_all_symbols_read_handler all_symbols_read_handler; | |
74 | ld_plugin_cleanup_handler cleanup_handler; | |
75 | /* TRUE if the cleanup handlers have been called. */ | |
76 | bfd_boolean cleanup_done; | |
77 | } plugin_t; | |
78 | ||
f4b78d18 L |
79 | /* The internal version of struct ld_plugin_input_file with a BFD |
80 | pointer. */ | |
81 | typedef struct plugin_input_file | |
82 | { | |
83 | bfd *abfd; | |
84 | char *name; | |
85 | int fd; | |
86 | off_t offset; | |
87 | off_t filesize; | |
88 | } plugin_input_file_t; | |
89 | ||
5d3236ee DK |
90 | /* The master list of all plugins. */ |
91 | static plugin_t *plugins_list = NULL; | |
92 | ||
93 | /* We keep a tail pointer for easy linking on the end. */ | |
94 | static plugin_t **plugins_tail_chain_ptr = &plugins_list; | |
95 | ||
96 | /* The last plugin added to the list, for receiving args. */ | |
97 | static plugin_t *last_plugin = NULL; | |
98 | ||
99 | /* The tail of the arg chain of the last plugin added to the list. */ | |
100 | static plugin_arg_t **last_plugin_args_tail_chain_ptr = NULL; | |
101 | ||
102 | /* The plugin which is currently having a callback executed. */ | |
103 | static plugin_t *called_plugin = NULL; | |
104 | ||
105 | /* Last plugin to cause an error, if any. */ | |
106 | static const char *error_plugin = NULL; | |
107 | ||
24f58f47 | 108 | /* State of linker "notice" interface before we poked at it. */ |
9e2278f5 | 109 | static bfd_boolean orig_notice_all; |
9e2278f5 AM |
110 | |
111 | /* Original linker callbacks, and the plugin version. */ | |
112 | static const struct bfd_link_callbacks *orig_callbacks; | |
113 | static struct bfd_link_callbacks plugin_callbacks; | |
114 | ||
5d3236ee DK |
115 | /* Set at all symbols read time, to avoid recursively offering the plugin |
116 | its own newly-added input files and libs to claim. */ | |
9e2278f5 | 117 | bfd_boolean no_more_claiming = FALSE; |
5d3236ee DK |
118 | |
119 | /* List of tags to set in the constant leading part of the tv array. */ | |
120 | static const enum ld_plugin_tag tv_header_tags[] = | |
121 | { | |
122 | LDPT_MESSAGE, | |
123 | LDPT_API_VERSION, | |
124 | LDPT_GNU_LD_VERSION, | |
125 | LDPT_LINKER_OUTPUT, | |
126 | LDPT_OUTPUT_NAME, | |
127 | LDPT_REGISTER_CLAIM_FILE_HOOK, | |
128 | LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK, | |
129 | LDPT_REGISTER_CLEANUP_HOOK, | |
130 | LDPT_ADD_SYMBOLS, | |
131 | LDPT_GET_INPUT_FILE, | |
15f7a26b | 132 | LDPT_GET_VIEW, |
5d3236ee DK |
133 | LDPT_RELEASE_INPUT_FILE, |
134 | LDPT_GET_SYMBOLS, | |
69ee6ab2 | 135 | LDPT_GET_SYMBOLS_V2, |
5d3236ee DK |
136 | LDPT_ADD_INPUT_FILE, |
137 | LDPT_ADD_INPUT_LIBRARY, | |
138 | LDPT_SET_EXTRA_LIBRARY_PATH | |
139 | }; | |
140 | ||
141 | /* How many entries in the constant leading part of the tv array. */ | |
142 | static const size_t tv_header_size = ARRAY_SIZE (tv_header_tags); | |
143 | ||
9e2278f5 | 144 | /* Forward references. */ |
16d96b5b | 145 | static bfd_boolean plugin_notice (struct bfd_link_info *, |
46135103 AM |
146 | struct bfd_link_hash_entry *, |
147 | struct bfd_link_hash_entry *, | |
148 | bfd *, asection *, bfd_vma, flagword); | |
9e2278f5 | 149 | |
3917d5d5 DK |
150 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
151 | ||
152 | #define RTLD_NOW 0 /* Dummy value. */ | |
153 | ||
154 | static void * | |
155 | dlopen (const char *file, int mode ATTRIBUTE_UNUSED) | |
156 | { | |
157 | return LoadLibrary (file); | |
158 | } | |
159 | ||
160 | static void * | |
161 | dlsym (void *handle, const char *name) | |
162 | { | |
163 | return GetProcAddress (handle, name); | |
164 | } | |
165 | ||
166 | static int | |
167 | dlclose (void *handle) | |
168 | { | |
169 | FreeLibrary (handle); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */ | |
174 | ||
d82184d7 L |
175 | #ifndef HAVE_DLFCN_H |
176 | static const char * | |
177 | dlerror (void) | |
178 | { | |
179 | return ""; | |
180 | } | |
181 | #endif | |
182 | ||
5d3236ee DK |
183 | /* Helper function for exiting with error status. */ |
184 | static int | |
185 | set_plugin_error (const char *plugin) | |
186 | { | |
187 | error_plugin = plugin; | |
188 | return -1; | |
189 | } | |
190 | ||
191 | /* Test if an error occurred. */ | |
192 | static bfd_boolean | |
193 | plugin_error_p (void) | |
194 | { | |
195 | return error_plugin != NULL; | |
196 | } | |
197 | ||
198 | /* Return name of plugin which caused an error if any. */ | |
d44ad554 DK |
199 | const char * |
200 | plugin_error_plugin (void) | |
5d3236ee DK |
201 | { |
202 | return error_plugin ? error_plugin : _("<no plugin>"); | |
203 | } | |
204 | ||
205 | /* Handle -plugin arg: find and load plugin, or return error. */ | |
d82184d7 | 206 | void |
d44ad554 | 207 | plugin_opt_plugin (const char *plugin) |
5d3236ee DK |
208 | { |
209 | plugin_t *newplug; | |
210 | ||
211 | newplug = xmalloc (sizeof *newplug); | |
212 | memset (newplug, 0, sizeof *newplug); | |
213 | newplug->name = plugin; | |
214 | newplug->dlhandle = dlopen (plugin, RTLD_NOW); | |
215 | if (!newplug->dlhandle) | |
d82184d7 | 216 | einfo (_("%P%F: %s: error loading plugin: %s\n"), plugin, dlerror ()); |
5d3236ee DK |
217 | |
218 | /* Chain on end, so when we run list it is in command-line order. */ | |
219 | *plugins_tail_chain_ptr = newplug; | |
220 | plugins_tail_chain_ptr = &newplug->next; | |
221 | ||
222 | /* Record it as current plugin for receiving args. */ | |
223 | last_plugin = newplug; | |
224 | last_plugin_args_tail_chain_ptr = &newplug->args; | |
5d3236ee DK |
225 | } |
226 | ||
227 | /* Accumulate option arguments for last-loaded plugin, or return | |
228 | error if none. */ | |
d44ad554 DK |
229 | int |
230 | plugin_opt_plugin_arg (const char *arg) | |
5d3236ee DK |
231 | { |
232 | plugin_arg_t *newarg; | |
233 | ||
234 | if (!last_plugin) | |
235 | return set_plugin_error (_("<no plugin>")); | |
236 | ||
97964ab3 AM |
237 | /* Ignore -pass-through= from GCC driver. */ |
238 | if (*arg == '-') | |
239 | { | |
240 | const char *p = arg + 1; | |
241 | ||
242 | if (*p == '-') | |
243 | ++p; | |
244 | if (strncmp (p, "pass-through=", 13) == 0) | |
245 | return 0; | |
246 | } | |
247 | ||
5d3236ee DK |
248 | newarg = xmalloc (sizeof *newarg); |
249 | newarg->arg = arg; | |
250 | newarg->next = NULL; | |
251 | ||
252 | /* Chain on end to preserve command-line order. */ | |
253 | *last_plugin_args_tail_chain_ptr = newarg; | |
254 | last_plugin_args_tail_chain_ptr = &newarg->next; | |
255 | last_plugin->n_args++; | |
256 | return 0; | |
257 | } | |
258 | ||
37a3056a L |
259 | /* Generate a dummy BFD to represent an IR file, for any callers of |
260 | plugin_call_claim_file to use as the handle in the ld_plugin_input_file | |
261 | struct that they build to pass in. The BFD is initially writable, so | |
262 | that symbols can be added to it; it must be made readable after the | |
263 | add_symbols hook has been called so that it can be read when linking. */ | |
264 | static bfd * | |
5d3236ee DK |
265 | plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate) |
266 | { | |
bc110b6e AM |
267 | bfd *abfd; |
268 | ||
269 | bfd_use_reserved_id = 1; | |
9e2278f5 | 270 | abfd = bfd_create (concat (name, IRONLY_SUFFIX, (const char *) NULL), |
bc110b6e | 271 | srctemplate); |
9e2278f5 AM |
272 | if (abfd != NULL) |
273 | { | |
274 | abfd->flags |= BFD_LINKER_CREATED | BFD_PLUGIN; | |
275 | bfd_set_arch_info (abfd, bfd_get_arch_info (srctemplate)); | |
276 | bfd_set_gp_size (abfd, bfd_get_gp_size (srctemplate)); | |
277 | if (bfd_make_writable (abfd) | |
278 | && bfd_copy_private_bfd_data (srctemplate, abfd)) | |
279 | { | |
280 | flagword flags; | |
281 | ||
c77ec726 | 282 | /* Create section to own the symbols. */ |
9e2278f5 AM |
283 | flags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY |
284 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE); | |
285 | if (bfd_make_section_anyway_with_flags (abfd, ".text", flags)) | |
286 | return abfd; | |
287 | } | |
288 | } | |
289 | einfo (_("could not create dummy IR bfd: %F%E\n")); | |
290 | return NULL; | |
5d3236ee DK |
291 | } |
292 | ||
d44ad554 | 293 | /* Check if the BFD passed in is an IR dummy object file. */ |
23ebe1a0 | 294 | static inline bfd_boolean |
5d3236ee DK |
295 | is_ir_dummy_bfd (const bfd *abfd) |
296 | { | |
cf4dc96f | 297 | /* ABFD can sometimes legitimately be NULL, e.g. when called from one |
23ebe1a0 AM |
298 | of the linker callbacks for a symbol in the *ABS* or *UND* sections. */ |
299 | return abfd != NULL && (abfd->flags & BFD_PLUGIN) != 0; | |
5d3236ee DK |
300 | } |
301 | ||
302 | /* Helpers to convert between BFD and GOLD symbol formats. */ | |
303 | static enum ld_plugin_status | |
304 | asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym, | |
f84854b6 | 305 | const struct ld_plugin_symbol *ldsym) |
5d3236ee DK |
306 | { |
307 | flagword flags = BSF_NO_FLAGS; | |
308 | struct bfd_section *section; | |
309 | ||
310 | asym->the_bfd = abfd; | |
f84854b6 | 311 | asym->name = (ldsym->version |
9e2278f5 | 312 | ? concat (ldsym->name, "@", ldsym->version, (const char *) NULL) |
f84854b6 | 313 | : ldsym->name); |
5d3236ee DK |
314 | asym->value = 0; |
315 | switch (ldsym->def) | |
316 | { | |
317 | case LDPK_WEAKDEF: | |
318 | flags = BSF_WEAK; | |
319 | /* FALLTHRU */ | |
320 | case LDPK_DEF: | |
321 | flags |= BSF_GLOBAL; | |
c77ec726 AM |
322 | if (ldsym->comdat_key) |
323 | { | |
324 | char *name = concat (".gnu.linkonce.t.", ldsym->comdat_key, | |
325 | (const char *) NULL); | |
326 | section = bfd_get_section_by_name (abfd, name); | |
327 | if (section != NULL) | |
328 | free (name); | |
329 | else | |
330 | { | |
331 | flagword sflags; | |
332 | ||
333 | sflags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY | |
334 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE | |
335 | | SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD); | |
336 | section = bfd_make_section_anyway_with_flags (abfd, name, sflags); | |
337 | if (section == NULL) | |
338 | return LDPS_ERR; | |
339 | } | |
340 | } | |
341 | else | |
342 | section = bfd_get_section_by_name (abfd, ".text"); | |
5d3236ee DK |
343 | break; |
344 | ||
345 | case LDPK_WEAKUNDEF: | |
346 | flags = BSF_WEAK; | |
347 | /* FALLTHRU */ | |
348 | case LDPK_UNDEF: | |
349 | section = bfd_und_section_ptr; | |
350 | break; | |
351 | ||
352 | case LDPK_COMMON: | |
353 | flags = BSF_GLOBAL; | |
354 | section = bfd_com_section_ptr; | |
355 | asym->value = ldsym->size; | |
5c08b7d4 L |
356 | /* For ELF targets, set alignment of common symbol to 1. */ |
357 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
02d00247 AM |
358 | { |
359 | ((elf_symbol_type *) asym)->internal_elf_sym.st_shndx = SHN_COMMON; | |
360 | ((elf_symbol_type *) asym)->internal_elf_sym.st_value = 1; | |
361 | } | |
5d3236ee DK |
362 | break; |
363 | ||
364 | default: | |
365 | return LDPS_ERR; | |
366 | } | |
367 | asym->flags = flags; | |
368 | asym->section = section; | |
369 | ||
370 | /* Visibility only applies on ELF targets. */ | |
371 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
372 | { | |
373 | elf_symbol_type *elfsym = elf_symbol_from (abfd, asym); | |
cfac8028 L |
374 | unsigned char visibility; |
375 | ||
5d3236ee | 376 | if (!elfsym) |
ea360572 | 377 | einfo (_("%P%F: %s: non-ELF symbol in ELF BFD!\n"), asym->name); |
cfac8028 L |
378 | switch (ldsym->visibility) |
379 | { | |
380 | default: | |
ea360572 | 381 | einfo (_("%P%F: unknown ELF symbol visibility: %d!\n"), |
cfac8028 L |
382 | ldsym->visibility); |
383 | case LDPV_DEFAULT: | |
384 | visibility = STV_DEFAULT; | |
385 | break; | |
386 | case LDPV_PROTECTED: | |
387 | visibility = STV_PROTECTED; | |
388 | break; | |
389 | case LDPV_INTERNAL: | |
390 | visibility = STV_INTERNAL; | |
391 | break; | |
392 | case LDPV_HIDDEN: | |
393 | visibility = STV_HIDDEN; | |
394 | break; | |
395 | } | |
396 | elfsym->internal_elf_sym.st_other | |
397 | = (visibility | (elfsym->internal_elf_sym.st_other | |
398 | & ~ELF_ST_VISIBILITY (-1))); | |
5d3236ee DK |
399 | } |
400 | ||
401 | return LDPS_OK; | |
402 | } | |
403 | ||
404 | /* Register a claim-file handler. */ | |
405 | static enum ld_plugin_status | |
406 | register_claim_file (ld_plugin_claim_file_handler handler) | |
407 | { | |
408 | ASSERT (called_plugin); | |
409 | called_plugin->claim_file_handler = handler; | |
410 | return LDPS_OK; | |
411 | } | |
412 | ||
413 | /* Register an all-symbols-read handler. */ | |
414 | static enum ld_plugin_status | |
415 | register_all_symbols_read (ld_plugin_all_symbols_read_handler handler) | |
416 | { | |
417 | ASSERT (called_plugin); | |
418 | called_plugin->all_symbols_read_handler = handler; | |
419 | return LDPS_OK; | |
420 | } | |
421 | ||
422 | /* Register a cleanup handler. */ | |
423 | static enum ld_plugin_status | |
424 | register_cleanup (ld_plugin_cleanup_handler handler) | |
425 | { | |
426 | ASSERT (called_plugin); | |
427 | called_plugin->cleanup_handler = handler; | |
428 | return LDPS_OK; | |
429 | } | |
430 | ||
431 | /* Add symbols from a plugin-claimed input file. */ | |
432 | static enum ld_plugin_status | |
433 | add_symbols (void *handle, int nsyms, const struct ld_plugin_symbol *syms) | |
434 | { | |
435 | asymbol **symptrs; | |
f4b78d18 L |
436 | plugin_input_file_t *input = handle; |
437 | bfd *abfd = input->abfd; | |
7fe550fc | 438 | int n; |
43e1669b | 439 | |
5d3236ee DK |
440 | ASSERT (called_plugin); |
441 | symptrs = xmalloc (nsyms * sizeof *symptrs); | |
7fe550fc | 442 | for (n = 0; n < nsyms; n++) |
5d3236ee DK |
443 | { |
444 | enum ld_plugin_status rv; | |
0c511000 AM |
445 | asymbol *bfdsym; |
446 | ||
0c511000 | 447 | bfdsym = bfd_make_empty_symbol (abfd); |
7fe550fc | 448 | symptrs[n] = bfdsym; |
5d3236ee DK |
449 | rv = asymbol_from_plugin_symbol (abfd, bfdsym, syms + n); |
450 | if (rv != LDPS_OK) | |
451 | return rv; | |
452 | } | |
7fe550fc | 453 | bfd_set_symtab (abfd, symptrs, nsyms); |
5d3236ee DK |
454 | return LDPS_OK; |
455 | } | |
456 | ||
457 | /* Get the input file information with an open (possibly re-opened) | |
458 | file descriptor. */ | |
459 | static enum ld_plugin_status | |
f4b78d18 | 460 | get_input_file (const void *handle, struct ld_plugin_input_file *file) |
5d3236ee | 461 | { |
f4b78d18 L |
462 | const plugin_input_file_t *input = handle; |
463 | ||
5d3236ee | 464 | ASSERT (called_plugin); |
f4b78d18 L |
465 | |
466 | file->name = input->name; | |
467 | file->offset = input->offset; | |
468 | file->filesize = input->filesize; | |
469 | file->handle = (void *) handle; | |
470 | ||
471 | return LDPS_OK; | |
5d3236ee DK |
472 | } |
473 | ||
15f7a26b L |
474 | /* Get view of the input file. */ |
475 | static enum ld_plugin_status | |
f4b78d18 | 476 | get_view (const void *handle, const void **viewp) |
15f7a26b | 477 | { |
f4b78d18 L |
478 | const plugin_input_file_t *input = handle; |
479 | char *buffer; | |
480 | size_t size; | |
481 | ||
15f7a26b | 482 | ASSERT (called_plugin); |
f4b78d18 L |
483 | |
484 | if (lseek (input->fd, input->offset, SEEK_SET) < 0) | |
485 | return LDPS_ERR; | |
486 | ||
487 | size = input->filesize; | |
488 | buffer = bfd_alloc (input->abfd, size); | |
489 | if (buffer == NULL) | |
490 | return LDPS_ERR; | |
491 | *viewp = buffer; | |
492 | ||
493 | do | |
494 | { | |
495 | ssize_t got = read (input->fd, buffer, size); | |
496 | if (got == 0) | |
497 | break; | |
498 | else if (got > 0) | |
499 | { | |
500 | buffer += got; | |
501 | size -= got; | |
502 | } | |
503 | else if (errno != EINTR) | |
504 | return LDPS_ERR; | |
505 | } | |
506 | while (size > 0); | |
507 | ||
508 | return LDPS_OK; | |
15f7a26b L |
509 | } |
510 | ||
5d3236ee DK |
511 | /* Release the input file. */ |
512 | static enum ld_plugin_status | |
f4b78d18 | 513 | release_input_file (const void *handle) |
5d3236ee | 514 | { |
119d62ff | 515 | plugin_input_file_t *input = (plugin_input_file_t *) handle; |
5d3236ee | 516 | ASSERT (called_plugin); |
f4b78d18 | 517 | if (input->fd != -1) |
119d62ff L |
518 | { |
519 | close (input->fd); | |
520 | input->fd = -1; | |
521 | } | |
f4b78d18 | 522 | return LDPS_OK; |
5d3236ee DK |
523 | } |
524 | ||
42a851a9 DK |
525 | /* Return TRUE if a defined symbol might be reachable from outside the |
526 | universe of claimed objects. */ | |
527 | static inline bfd_boolean | |
9bbc1a67 | 528 | is_visible_from_outside (struct ld_plugin_symbol *lsym, |
f84854b6 | 529 | struct bfd_link_hash_entry *blhe) |
42a851a9 | 530 | { |
35ed3f94 AM |
531 | struct bfd_sym_chain *sym; |
532 | ||
42a851a9 DK |
533 | if (link_info.relocatable) |
534 | return TRUE; | |
9bbc1a67 | 535 | if (link_info.export_dynamic || !link_info.executable) |
42a851a9 | 536 | { |
fd91d419 L |
537 | /* Check if symbol is hidden by version script. */ |
538 | if (bfd_hide_sym_by_version (link_info.version_info, | |
539 | blhe->root.string)) | |
540 | return FALSE; | |
42a851a9 DK |
541 | /* Only ELF symbols really have visibility. */ |
542 | if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour) | |
543 | { | |
544 | struct elf_link_hash_entry *el = (struct elf_link_hash_entry *)blhe; | |
545 | int vis = ELF_ST_VISIBILITY (el->other); | |
546 | return vis == STV_DEFAULT || vis == STV_PROTECTED; | |
547 | } | |
548 | /* On non-ELF targets, we can safely make inferences by considering | |
f84854b6 | 549 | what visibility the plugin would have liked to apply when it first |
42a851a9 DK |
550 | sent us the symbol. During ELF symbol processing, visibility only |
551 | ever becomes more restrictive, not less, when symbols are merged, | |
552 | so this is a conservative estimate; it may give false positives, | |
553 | declaring something visible from outside when it in fact would | |
554 | not have been, but this will only lead to missed optimisation | |
555 | opportunities during LTRANS at worst; it will not give false | |
556 | negatives, which can lead to the disastrous conclusion that the | |
557 | related symbol is IRONLY. (See GCC PR46319 for an example.) */ | |
cfac8028 L |
558 | return (lsym->visibility == LDPV_DEFAULT |
559 | || lsym->visibility == LDPV_PROTECTED); | |
42a851a9 | 560 | } |
35ed3f94 AM |
561 | |
562 | for (sym = &entry_symbol; sym != NULL; sym = sym->next) | |
563 | if (sym->name | |
564 | && strcmp (sym->name, blhe->root.string) == 0) | |
565 | return TRUE; | |
566 | ||
42a851a9 DK |
567 | return FALSE; |
568 | } | |
569 | ||
5d3236ee DK |
570 | /* Get the symbol resolution info for a plugin-claimed input file. */ |
571 | static enum ld_plugin_status | |
69ee6ab2 AM |
572 | get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms, |
573 | int def_ironly_exp) | |
5d3236ee | 574 | { |
f4b78d18 L |
575 | const plugin_input_file_t *input = handle; |
576 | const bfd *abfd = (const bfd *) input->abfd; | |
5d3236ee | 577 | int n; |
69ee6ab2 | 578 | |
5d3236ee DK |
579 | ASSERT (called_plugin); |
580 | for (n = 0; n < nsyms; n++) | |
581 | { | |
582 | struct bfd_link_hash_entry *blhe; | |
42a851a9 | 583 | asection *owner_sec; |
69ee6ab2 AM |
584 | int res; |
585 | ||
10be1b6a DK |
586 | if (syms[n].def != LDPK_UNDEF) |
587 | blhe = bfd_link_hash_lookup (link_info.hash, syms[n].name, | |
588 | FALSE, FALSE, TRUE); | |
589 | else | |
590 | blhe = bfd_wrapped_link_hash_lookup (link_info.output_bfd, &link_info, | |
591 | syms[n].name, FALSE, FALSE, TRUE); | |
5d3236ee DK |
592 | if (!blhe) |
593 | { | |
69ee6ab2 | 594 | res = LDPR_UNKNOWN; |
1715a13c | 595 | goto report_symbol; |
5d3236ee DK |
596 | } |
597 | ||
598 | /* Determine resolution from blhe type and symbol's original type. */ | |
599 | if (blhe->type == bfd_link_hash_undefined | |
f84854b6 | 600 | || blhe->type == bfd_link_hash_undefweak) |
5d3236ee | 601 | { |
69ee6ab2 | 602 | res = LDPR_UNDEF; |
1715a13c | 603 | goto report_symbol; |
5d3236ee DK |
604 | } |
605 | if (blhe->type != bfd_link_hash_defined | |
f84854b6 L |
606 | && blhe->type != bfd_link_hash_defweak |
607 | && blhe->type != bfd_link_hash_common) | |
5d3236ee DK |
608 | { |
609 | /* We should not have a new, indirect or warning symbol here. */ | |
ea360572 | 610 | einfo ("%P%F: %s: plugin symbol table corrupt (sym type %d)\n", |
f84854b6 | 611 | called_plugin->name, blhe->type); |
5d3236ee DK |
612 | } |
613 | ||
42a851a9 DK |
614 | /* Find out which section owns the symbol. Since it's not undef, |
615 | it must have an owner; if it's not a common symbol, both defs | |
616 | and weakdefs keep it in the same place. */ | |
9e2278f5 AM |
617 | owner_sec = (blhe->type == bfd_link_hash_common |
618 | ? blhe->u.c.p->section | |
619 | : blhe->u.def.section); | |
42a851a9 | 620 | |
5d3236ee DK |
621 | |
622 | /* If it was originally undefined or common, then it has been | |
f84854b6 L |
623 | resolved; determine how. */ |
624 | if (syms[n].def == LDPK_UNDEF | |
625 | || syms[n].def == LDPK_WEAKUNDEF | |
5d3236ee DK |
626 | || syms[n].def == LDPK_COMMON) |
627 | { | |
5d3236ee | 628 | if (owner_sec->owner == link_info.output_bfd) |
69ee6ab2 | 629 | res = LDPR_RESOLVED_EXEC; |
5d3236ee | 630 | else if (owner_sec->owner == abfd) |
69ee6ab2 | 631 | res = LDPR_PREVAILING_DEF_IRONLY; |
5d3236ee | 632 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
69ee6ab2 | 633 | res = LDPR_RESOLVED_IR; |
cc322803 L |
634 | else if (owner_sec->owner != NULL |
635 | && (owner_sec->owner->flags & DYNAMIC) != 0) | |
69ee6ab2 | 636 | res = LDPR_RESOLVED_DYN; |
5d3236ee | 637 | else |
69ee6ab2 | 638 | res = LDPR_RESOLVED_EXEC; |
5d3236ee DK |
639 | } |
640 | ||
641 | /* Was originally def, or weakdef. Does it prevail? If the | |
f84854b6 | 642 | owner is the original dummy bfd that supplied it, then this |
5d3236ee | 643 | is the definition that has prevailed. */ |
69ee6ab2 AM |
644 | else if (owner_sec->owner == link_info.output_bfd) |
645 | res = LDPR_PREEMPTED_REG; | |
42a851a9 | 646 | else if (owner_sec->owner == abfd) |
69ee6ab2 | 647 | res = LDPR_PREVAILING_DEF_IRONLY; |
5d3236ee DK |
648 | |
649 | /* Was originally def, weakdef, or common, but has been pre-empted. */ | |
69ee6ab2 AM |
650 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
651 | res = LDPR_PREEMPTED_IR; | |
652 | else | |
653 | res = LDPR_PREEMPTED_REG; | |
654 | ||
655 | if (res == LDPR_PREVAILING_DEF_IRONLY) | |
656 | { | |
657 | /* We need to know if the sym is referenced from non-IR files. Or | |
658 | even potentially-referenced, perhaps in a future final link if | |
659 | this is a partial one, perhaps dynamically at load-time if the | |
660 | symbol is externally visible. */ | |
661 | if (blhe->non_ir_ref) | |
662 | res = LDPR_PREVAILING_DEF; | |
9bbc1a67 | 663 | else if (is_visible_from_outside (&syms[n], blhe)) |
69ee6ab2 AM |
664 | res = def_ironly_exp; |
665 | } | |
1715a13c | 666 | |
9e2278f5 | 667 | report_symbol: |
69ee6ab2 | 668 | syms[n].resolution = res; |
1715a13c | 669 | if (report_plugin_symbols) |
9e2278f5 AM |
670 | einfo (_("%P: %B: symbol `%s' " |
671 | "definition: %d, visibility: %d, resolution: %d\n"), | |
672 | abfd, syms[n].name, | |
69ee6ab2 | 673 | syms[n].def, syms[n].visibility, res); |
5d3236ee DK |
674 | } |
675 | return LDPS_OK; | |
676 | } | |
677 | ||
69ee6ab2 AM |
678 | static enum ld_plugin_status |
679 | get_symbols_v1 (const void *handle, int nsyms, struct ld_plugin_symbol *syms) | |
680 | { | |
681 | return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF); | |
682 | } | |
683 | ||
684 | static enum ld_plugin_status | |
685 | get_symbols_v2 (const void *handle, int nsyms, struct ld_plugin_symbol *syms) | |
686 | { | |
687 | return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF_IRONLY_EXP); | |
688 | } | |
689 | ||
5d3236ee DK |
690 | /* Add a new (real) input file generated by a plugin. */ |
691 | static enum ld_plugin_status | |
692 | add_input_file (const char *pathname) | |
693 | { | |
694 | ASSERT (called_plugin); | |
d4cb7acd | 695 | if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_file_enum, |
f84854b6 | 696 | NULL)) |
5d3236ee DK |
697 | return LDPS_ERR; |
698 | return LDPS_OK; | |
699 | } | |
700 | ||
701 | /* Add a new (real) library required by a plugin. */ | |
702 | static enum ld_plugin_status | |
703 | add_input_library (const char *pathname) | |
704 | { | |
705 | ASSERT (called_plugin); | |
d4cb7acd | 706 | if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_l_enum, |
f84854b6 | 707 | NULL)) |
5d3236ee DK |
708 | return LDPS_ERR; |
709 | return LDPS_OK; | |
710 | } | |
711 | ||
712 | /* Set the extra library path to be used by libraries added via | |
713 | add_input_library. */ | |
714 | static enum ld_plugin_status | |
715 | set_extra_library_path (const char *path) | |
716 | { | |
717 | ASSERT (called_plugin); | |
d4cb7acd | 718 | ldfile_add_library_path (xstrdup (path), FALSE); |
5d3236ee DK |
719 | return LDPS_OK; |
720 | } | |
721 | ||
722 | /* Issue a diagnostic message from a plugin. */ | |
723 | static enum ld_plugin_status | |
724 | message (int level, const char *format, ...) | |
725 | { | |
726 | va_list args; | |
727 | va_start (args, format); | |
728 | ||
729 | switch (level) | |
730 | { | |
731 | case LDPL_INFO: | |
732 | vfinfo (stdout, format, args, FALSE); | |
d251c5c4 | 733 | putchar ('\n'); |
5d3236ee DK |
734 | break; |
735 | case LDPL_WARNING: | |
736 | vfinfo (stdout, format, args, TRUE); | |
d251c5c4 | 737 | putchar ('\n'); |
5d3236ee DK |
738 | break; |
739 | case LDPL_FATAL: | |
740 | case LDPL_ERROR: | |
741 | default: | |
9e2278f5 AM |
742 | { |
743 | char *newfmt = ACONCAT ((level == LDPL_FATAL ? "%P%F: " : "%P%X: ", | |
744 | format, "\n", (const char *) NULL)); | |
745 | fflush (stdout); | |
746 | vfinfo (stderr, newfmt, args, TRUE); | |
747 | fflush (stderr); | |
748 | } | |
5d3236ee DK |
749 | break; |
750 | } | |
751 | ||
752 | va_end (args); | |
753 | return LDPS_OK; | |
754 | } | |
755 | ||
756 | /* Helper to size leading part of tv array and set it up. */ | |
69ee6ab2 | 757 | static void |
5d3236ee DK |
758 | set_tv_header (struct ld_plugin_tv *tv) |
759 | { | |
760 | size_t i; | |
761 | ||
762 | /* Version info. */ | |
763 | static const unsigned int major = (unsigned)(BFD_VERSION / 100000000UL); | |
764 | static const unsigned int minor = (unsigned)(BFD_VERSION / 1000000UL) % 100; | |
765 | ||
5d3236ee DK |
766 | for (i = 0; i < tv_header_size; i++) |
767 | { | |
768 | tv[i].tv_tag = tv_header_tags[i]; | |
769 | #define TVU(x) tv[i].tv_u.tv_ ## x | |
770 | switch (tv[i].tv_tag) | |
771 | { | |
f84854b6 L |
772 | case LDPT_MESSAGE: |
773 | TVU(message) = message; | |
774 | break; | |
775 | case LDPT_API_VERSION: | |
776 | TVU(val) = LD_PLUGIN_API_VERSION; | |
777 | break; | |
778 | case LDPT_GNU_LD_VERSION: | |
779 | TVU(val) = major * 100 + minor; | |
780 | break; | |
781 | case LDPT_LINKER_OUTPUT: | |
782 | TVU(val) = (link_info.relocatable | |
783 | ? LDPO_REL | |
6611f2e1 L |
784 | : (link_info.executable |
785 | ? (link_info.pie ? LDPO_PIE : LDPO_EXEC) | |
786 | : LDPO_DYN)); | |
f84854b6 L |
787 | break; |
788 | case LDPT_OUTPUT_NAME: | |
789 | TVU(string) = output_filename; | |
790 | break; | |
791 | case LDPT_REGISTER_CLAIM_FILE_HOOK: | |
792 | TVU(register_claim_file) = register_claim_file; | |
793 | break; | |
794 | case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: | |
795 | TVU(register_all_symbols_read) = register_all_symbols_read; | |
796 | break; | |
797 | case LDPT_REGISTER_CLEANUP_HOOK: | |
798 | TVU(register_cleanup) = register_cleanup; | |
799 | break; | |
800 | case LDPT_ADD_SYMBOLS: | |
801 | TVU(add_symbols) = add_symbols; | |
802 | break; | |
803 | case LDPT_GET_INPUT_FILE: | |
804 | TVU(get_input_file) = get_input_file; | |
805 | break; | |
15f7a26b L |
806 | case LDPT_GET_VIEW: |
807 | TVU(get_view) = get_view; | |
808 | break; | |
f84854b6 L |
809 | case LDPT_RELEASE_INPUT_FILE: |
810 | TVU(release_input_file) = release_input_file; | |
811 | break; | |
812 | case LDPT_GET_SYMBOLS: | |
69ee6ab2 AM |
813 | TVU(get_symbols) = get_symbols_v1; |
814 | break; | |
815 | case LDPT_GET_SYMBOLS_V2: | |
816 | TVU(get_symbols) = get_symbols_v2; | |
f84854b6 L |
817 | break; |
818 | case LDPT_ADD_INPUT_FILE: | |
819 | TVU(add_input_file) = add_input_file; | |
820 | break; | |
821 | case LDPT_ADD_INPUT_LIBRARY: | |
822 | TVU(add_input_library) = add_input_library; | |
823 | break; | |
824 | case LDPT_SET_EXTRA_LIBRARY_PATH: | |
825 | TVU(set_extra_library_path) = set_extra_library_path; | |
826 | break; | |
827 | default: | |
828 | /* Added a new entry to the array without adding | |
829 | a new case to set up its value is a bug. */ | |
830 | FAIL (); | |
5d3236ee DK |
831 | } |
832 | #undef TVU | |
833 | } | |
5d3236ee DK |
834 | } |
835 | ||
836 | /* Append the per-plugin args list and trailing LDPT_NULL to tv. */ | |
837 | static void | |
838 | set_tv_plugin_args (plugin_t *plugin, struct ld_plugin_tv *tv) | |
839 | { | |
840 | plugin_arg_t *arg = plugin->args; | |
841 | while (arg) | |
842 | { | |
843 | tv->tv_tag = LDPT_OPTION; | |
844 | tv->tv_u.tv_string = arg->arg; | |
845 | arg = arg->next; | |
846 | tv++; | |
847 | } | |
848 | tv->tv_tag = LDPT_NULL; | |
849 | tv->tv_u.tv_val = 0; | |
850 | } | |
851 | ||
852 | /* Load up and initialise all plugins after argument parsing. */ | |
d82184d7 | 853 | void |
d44ad554 | 854 | plugin_load_plugins (void) |
5d3236ee DK |
855 | { |
856 | struct ld_plugin_tv *my_tv; | |
857 | unsigned int max_args = 0; | |
858 | plugin_t *curplug = plugins_list; | |
859 | ||
860 | /* If there are no plugins, we need do nothing this run. */ | |
861 | if (!curplug) | |
d82184d7 | 862 | return; |
5d3236ee DK |
863 | |
864 | /* First pass over plugins to find max # args needed so that we | |
865 | can size and allocate the tv array. */ | |
866 | while (curplug) | |
867 | { | |
868 | if (curplug->n_args > max_args) | |
869 | max_args = curplug->n_args; | |
870 | curplug = curplug->next; | |
871 | } | |
872 | ||
873 | /* Allocate tv array and initialise constant part. */ | |
874 | my_tv = xmalloc ((max_args + 1 + tv_header_size) * sizeof *my_tv); | |
875 | set_tv_header (my_tv); | |
876 | ||
877 | /* Pass over plugins again, activating them. */ | |
878 | curplug = plugins_list; | |
879 | while (curplug) | |
880 | { | |
881 | enum ld_plugin_status rv; | |
a8f9d13e AM |
882 | ld_plugin_onload onloadfn; |
883 | ||
884 | onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "onload"); | |
5d3236ee | 885 | if (!onloadfn) |
a8f9d13e | 886 | onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "_onload"); |
5d3236ee | 887 | if (!onloadfn) |
d82184d7 L |
888 | einfo (_("%P%F: %s: error loading plugin: %s\n"), |
889 | curplug->name, dlerror ()); | |
5d3236ee DK |
890 | set_tv_plugin_args (curplug, &my_tv[tv_header_size]); |
891 | called_plugin = curplug; | |
892 | rv = (*onloadfn) (my_tv); | |
893 | called_plugin = NULL; | |
894 | if (rv != LDPS_OK) | |
d82184d7 | 895 | einfo (_("%P%F: %s: plugin error: %d\n"), curplug->name, rv); |
5d3236ee DK |
896 | curplug = curplug->next; |
897 | } | |
898 | ||
899 | /* Since plugin(s) inited ok, assume they're going to want symbol | |
900 | resolutions, which needs us to track which symbols are referenced | |
901 | by non-IR files using the linker's notice callback. */ | |
9e2278f5 AM |
902 | orig_notice_all = link_info.notice_all; |
903 | orig_callbacks = link_info.callbacks; | |
904 | plugin_callbacks = *orig_callbacks; | |
905 | plugin_callbacks.notice = &plugin_notice; | |
5d3236ee | 906 | link_info.notice_all = TRUE; |
61f41c3c | 907 | link_info.lto_plugin_active = TRUE; |
9e2278f5 | 908 | link_info.callbacks = &plugin_callbacks; |
5d3236ee DK |
909 | } |
910 | ||
911 | /* Call 'claim file' hook for all plugins. */ | |
02d00247 | 912 | static int |
5d3236ee DK |
913 | plugin_call_claim_file (const struct ld_plugin_input_file *file, int *claimed) |
914 | { | |
915 | plugin_t *curplug = plugins_list; | |
916 | *claimed = FALSE; | |
917 | if (no_more_claiming) | |
918 | return 0; | |
919 | while (curplug && !*claimed) | |
920 | { | |
921 | if (curplug->claim_file_handler) | |
922 | { | |
923 | enum ld_plugin_status rv; | |
924 | called_plugin = curplug; | |
925 | rv = (*curplug->claim_file_handler) (file, claimed); | |
926 | called_plugin = NULL; | |
927 | if (rv != LDPS_OK) | |
928 | set_plugin_error (curplug->name); | |
929 | } | |
930 | curplug = curplug->next; | |
931 | } | |
932 | return plugin_error_p () ? -1 : 0; | |
933 | } | |
934 | ||
02d00247 AM |
935 | void |
936 | plugin_maybe_claim (struct ld_plugin_input_file *file, | |
937 | lang_input_statement_type *entry) | |
938 | { | |
939 | int claimed = 0; | |
f4b78d18 L |
940 | plugin_input_file_t *input; |
941 | size_t namelength; | |
02d00247 AM |
942 | |
943 | /* We create a dummy BFD, initially empty, to house whatever symbols | |
944 | the plugin may want to add. */ | |
f4b78d18 L |
945 | bfd *abfd = plugin_get_ir_dummy_bfd (entry->the_bfd->filename, |
946 | entry->the_bfd); | |
947 | ||
948 | input = bfd_alloc (abfd, sizeof (*input)); | |
949 | if (input == NULL) | |
950 | einfo (_("%P%F: plugin failed to allocate memory for input: %s\n"), | |
951 | bfd_get_error ()); | |
952 | ||
953 | input->abfd = abfd; | |
954 | input->fd = file->fd; | |
955 | input->offset = file->offset; | |
956 | input->filesize = file->filesize; | |
957 | namelength = strlen (entry->the_bfd->filename) + 1; | |
958 | input->name = bfd_alloc (abfd, namelength); | |
959 | if (input->name == NULL) | |
960 | einfo (_("%P%F: plugin failed to allocate memory for input filename: %s\n"), | |
961 | bfd_get_error ()); | |
962 | memcpy (input->name, entry->the_bfd->filename, namelength); | |
963 | ||
964 | file->handle = input; | |
965 | ||
02d00247 AM |
966 | if (plugin_call_claim_file (file, &claimed)) |
967 | einfo (_("%P%F: %s: plugin reported error claiming file\n"), | |
968 | plugin_error_plugin ()); | |
f4b78d18 | 969 | |
119d62ff | 970 | if (input->fd != -1 && bfd_check_format (entry->the_bfd, bfd_object)) |
f4b78d18 L |
971 | { |
972 | /* FIXME: fd belongs to us, not the plugin. IR for GCC plugin, | |
973 | which doesn't need fd after plugin_call_claim_file, is | |
974 | stored in bfd_object file. Since GCC plugin before GCC 5 | |
975 | doesn't call release_input_file, we close it here. IR for | |
976 | LLVM plugin, which needs fd after plugin_call_claim_file and | |
977 | calls release_input_file after it is done, is stored in | |
978 | non-bfd_object file. This scheme doesn't work when a plugin | |
979 | needs fd and its IR is stored in bfd_object file. */ | |
980 | close (file->fd); | |
981 | input->fd = -1; | |
982 | } | |
983 | ||
02d00247 AM |
984 | if (claimed) |
985 | { | |
986 | /* Discard the real file's BFD and substitute the dummy one. */ | |
987 | ||
988 | /* BFD archive handling caches elements so we can't call | |
989 | bfd_close for archives. */ | |
990 | if (entry->the_bfd->my_archive == NULL) | |
991 | bfd_close (entry->the_bfd); | |
f4b78d18 | 992 | entry->the_bfd = abfd; |
66be1055 | 993 | entry->flags.claimed = TRUE; |
02d00247 AM |
994 | bfd_make_readable (entry->the_bfd); |
995 | } | |
996 | else | |
997 | { | |
998 | /* If plugin didn't claim the file, we don't need the dummy bfd. | |
999 | Can't avoid speculatively creating it, alas. */ | |
f4b78d18 | 1000 | bfd_close_all_done (abfd); |
66be1055 | 1001 | entry->flags.claimed = FALSE; |
02d00247 AM |
1002 | } |
1003 | } | |
1004 | ||
5d3236ee DK |
1005 | /* Call 'all symbols read' hook for all plugins. */ |
1006 | int | |
1007 | plugin_call_all_symbols_read (void) | |
1008 | { | |
1009 | plugin_t *curplug = plugins_list; | |
1010 | ||
1011 | /* Disable any further file-claiming. */ | |
1012 | no_more_claiming = TRUE; | |
1013 | ||
5d3236ee DK |
1014 | while (curplug) |
1015 | { | |
1016 | if (curplug->all_symbols_read_handler) | |
1017 | { | |
1018 | enum ld_plugin_status rv; | |
1019 | called_plugin = curplug; | |
1020 | rv = (*curplug->all_symbols_read_handler) (); | |
1021 | called_plugin = NULL; | |
1022 | if (rv != LDPS_OK) | |
1023 | set_plugin_error (curplug->name); | |
1024 | } | |
1025 | curplug = curplug->next; | |
1026 | } | |
1027 | return plugin_error_p () ? -1 : 0; | |
1028 | } | |
1029 | ||
e73d965c | 1030 | /* Call 'cleanup' hook for all plugins at exit. */ |
498cd2a0 | 1031 | void |
5d3236ee DK |
1032 | plugin_call_cleanup (void) |
1033 | { | |
1034 | plugin_t *curplug = plugins_list; | |
1035 | while (curplug) | |
1036 | { | |
1037 | if (curplug->cleanup_handler && !curplug->cleanup_done) | |
1038 | { | |
1039 | enum ld_plugin_status rv; | |
1040 | curplug->cleanup_done = TRUE; | |
1041 | called_plugin = curplug; | |
1042 | rv = (*curplug->cleanup_handler) (); | |
1043 | called_plugin = NULL; | |
1044 | if (rv != LDPS_OK) | |
d82184d7 L |
1045 | info_msg (_("%P: %s: error in plugin cleanup: %d (ignored)\n"), |
1046 | curplug->name, rv); | |
5d3236ee DK |
1047 | dlclose (curplug->dlhandle); |
1048 | } | |
1049 | curplug = curplug->next; | |
1050 | } | |
5d3236ee DK |
1051 | } |
1052 | ||
5d3236ee DK |
1053 | /* To determine which symbols should be resolved LDPR_PREVAILING_DEF |
1054 | and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as | |
35ed3f94 AM |
1055 | the linker adds them to the linker hash table. Mark those |
1056 | referenced from a non-IR file with non_ir_ref. We have to | |
1057 | notice_all symbols, because we won't necessarily know until later | |
1058 | which ones will be contributed by IR files. */ | |
9e2278f5 AM |
1059 | static bfd_boolean |
1060 | plugin_notice (struct bfd_link_info *info, | |
35ed3f94 | 1061 | struct bfd_link_hash_entry *h, |
46135103 | 1062 | struct bfd_link_hash_entry *inh, |
9e2278f5 AM |
1063 | bfd *abfd, |
1064 | asection *section, | |
16d96b5b | 1065 | bfd_vma value, |
46135103 | 1066 | flagword flags) |
5d3236ee | 1067 | { |
46135103 AM |
1068 | struct bfd_link_hash_entry *orig_h = h; |
1069 | ||
35ed3f94 | 1070 | if (h != NULL) |
5d3236ee | 1071 | { |
cd6eee13 AM |
1072 | bfd *sym_bfd; |
1073 | ||
46135103 AM |
1074 | if (h->type == bfd_link_hash_warning) |
1075 | h = h->u.i.link; | |
1076 | ||
4a2b04a7 | 1077 | /* Nothing to do here if this def/ref is from an IR dummy BFD. */ |
9e2278f5 | 1078 | if (is_ir_dummy_bfd (abfd)) |
4a2b04a7 | 1079 | ; |
9e2278f5 | 1080 | |
16d96b5b AM |
1081 | /* Making an indirect symbol counts as a reference unless this |
1082 | is a brand new symbol. */ | |
4a2b04a7 L |
1083 | else if (bfd_is_ind_section (section) |
1084 | || (flags & BSF_INDIRECT) != 0) | |
16d96b5b | 1085 | { |
46135103 AM |
1086 | /* ??? Some of this is questionable. See comments in |
1087 | _bfd_generic_link_add_one_symbol for case IND. */ | |
16d96b5b AM |
1088 | if (h->type != bfd_link_hash_new) |
1089 | { | |
16d96b5b | 1090 | h->non_ir_ref = TRUE; |
46135103 | 1091 | inh->non_ir_ref = TRUE; |
16d96b5b | 1092 | } |
46135103 AM |
1093 | else if (inh->type == bfd_link_hash_new) |
1094 | inh->non_ir_ref = TRUE; | |
16d96b5b AM |
1095 | } |
1096 | ||
1097 | /* Nothing to do here for warning symbols. */ | |
1098 | else if ((flags & BSF_WARNING) != 0) | |
1099 | ; | |
1100 | ||
1101 | /* Nothing to do here for constructor symbols. */ | |
1102 | else if ((flags & BSF_CONSTRUCTOR) != 0) | |
1103 | ; | |
1104 | ||
35ed3f94 | 1105 | /* If this is a ref, set non_ir_ref. */ |
16d96b5b | 1106 | else if (bfd_is_und_section (section)) |
3d5bef4c L |
1107 | { |
1108 | /* Replace the undefined dummy bfd with the real one. */ | |
1109 | if ((h->type == bfd_link_hash_undefined | |
1110 | || h->type == bfd_link_hash_undefweak) | |
46fed7f7 SL |
1111 | && (h->u.undef.abfd == NULL |
1112 | || (h->u.undef.abfd->flags & BFD_PLUGIN) != 0)) | |
3d5bef4c L |
1113 | h->u.undef.abfd = abfd; |
1114 | h->non_ir_ref = TRUE; | |
1115 | } | |
35ed3f94 AM |
1116 | |
1117 | /* Otherwise, it must be a new def. Ensure any symbol defined | |
1118 | in an IR dummy BFD takes on a new value from a real BFD. | |
1119 | Weak symbols are not normally overridden by a new weak | |
1120 | definition, and strong symbols will normally cause multiple | |
1121 | definition errors. Avoid this by making the symbol appear | |
1122 | to be undefined. */ | |
1123 | else if (((h->type == bfd_link_hash_defweak | |
1124 | || h->type == bfd_link_hash_defined) | |
cd6eee13 | 1125 | && is_ir_dummy_bfd (sym_bfd = h->u.def.section->owner)) |
35ed3f94 | 1126 | || (h->type == bfd_link_hash_common |
cd6eee13 AM |
1127 | && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner))) |
1128 | { | |
1129 | h->type = bfd_link_hash_undefweak; | |
1130 | h->u.undef.abfd = sym_bfd; | |
1131 | } | |
5d3236ee DK |
1132 | } |
1133 | ||
1134 | /* Continue with cref/nocrossref/trace-sym processing. */ | |
46135103 | 1135 | if (orig_h == NULL |
9e2278f5 AM |
1136 | || orig_notice_all |
1137 | || (info->notice_hash != NULL | |
46135103 | 1138 | && bfd_hash_lookup (info->notice_hash, orig_h->root.string, |
35ed3f94 | 1139 | FALSE, FALSE) != NULL)) |
46135103 AM |
1140 | return (*orig_callbacks->notice) (info, orig_h, inh, |
1141 | abfd, section, value, flags); | |
5d3236ee DK |
1142 | return TRUE; |
1143 | } |