1 /* Plugin control for the GNU linker.
2 Copyright (C) 2010-2015 Free Software Foundation, Inc.
4 This file is part of the GNU Binutils.
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.
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.
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. */
22 #include "libiberty.h"
33 #include "plugin-api.h"
35 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
39 /* Report plugin symbols. */
40 bfd_boolean report_plugin_symbols;
42 /* The suffix to append to the name of the real (claimed) object file
43 when generating a dummy BFD to hold the IR symbols sent from the
44 plugin. For cosmetic use only; appears in maps, crefs etc. */
45 #define IRONLY_SUFFIX " (symbol from plugin)"
47 /* Stores a single argument passed to a plugin. */
48 typedef struct plugin_arg
50 struct plugin_arg *next;
54 /* Holds all details of a single plugin. */
57 /* Next on the list of plugins, or NULL at end of chain. */
59 /* The argument string given to --plugin. */
61 /* The shared library handle returned by dlopen. */
63 /* The list of argument string given to --plugin-opt. */
65 /* Number of args in the list, for convenience. */
67 /* The plugin's event handlers. */
68 ld_plugin_claim_file_handler claim_file_handler;
69 ld_plugin_all_symbols_read_handler all_symbols_read_handler;
70 ld_plugin_cleanup_handler cleanup_handler;
71 /* TRUE if the cleanup handlers have been called. */
72 bfd_boolean cleanup_done;
75 /* The master list of all plugins. */
76 static plugin_t *plugins_list = NULL;
78 /* We keep a tail pointer for easy linking on the end. */
79 static plugin_t **plugins_tail_chain_ptr = &plugins_list;
81 /* The last plugin added to the list, for receiving args. */
82 static plugin_t *last_plugin = NULL;
84 /* The tail of the arg chain of the last plugin added to the list. */
85 static plugin_arg_t **last_plugin_args_tail_chain_ptr = NULL;
87 /* The plugin which is currently having a callback executed. */
88 static plugin_t *called_plugin = NULL;
90 /* Last plugin to cause an error, if any. */
91 static const char *error_plugin = NULL;
93 /* State of linker "notice" interface before we poked at it. */
94 static bfd_boolean orig_notice_all;
96 /* Original linker callbacks, and the plugin version. */
97 static const struct bfd_link_callbacks *orig_callbacks;
98 static struct bfd_link_callbacks plugin_callbacks;
100 /* Set at all symbols read time, to avoid recursively offering the plugin
101 its own newly-added input files and libs to claim. */
102 bfd_boolean no_more_claiming = FALSE;
104 /* List of tags to set in the constant leading part of the tv array. */
105 static const enum ld_plugin_tag tv_header_tags[] =
112 LDPT_REGISTER_CLAIM_FILE_HOOK,
113 LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK,
114 LDPT_REGISTER_CLEANUP_HOOK,
118 LDPT_RELEASE_INPUT_FILE,
122 LDPT_ADD_INPUT_LIBRARY,
123 LDPT_SET_EXTRA_LIBRARY_PATH
126 /* How many entries in the constant leading part of the tv array. */
127 static const size_t tv_header_size = ARRAY_SIZE (tv_header_tags);
129 /* Forward references. */
130 static bfd_boolean plugin_notice (struct bfd_link_info *,
131 struct bfd_link_hash_entry *,
132 struct bfd_link_hash_entry *,
133 bfd *, asection *, bfd_vma, flagword);
135 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
137 #define RTLD_NOW 0 /* Dummy value. */
140 dlopen (const char *file, int mode ATTRIBUTE_UNUSED)
142 return LoadLibrary (file);
146 dlsym (void *handle, const char *name)
148 return GetProcAddress (handle, name);
152 dlclose (void *handle)
154 FreeLibrary (handle);
158 #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */
168 /* Helper function for exiting with error status. */
170 set_plugin_error (const char *plugin)
172 error_plugin = plugin;
176 /* Test if an error occurred. */
178 plugin_error_p (void)
180 return error_plugin != NULL;
183 /* Return name of plugin which caused an error if any. */
185 plugin_error_plugin (void)
187 return error_plugin ? error_plugin : _("<no plugin>");
190 /* Handle -plugin arg: find and load plugin, or return error. */
192 plugin_opt_plugin (const char *plugin)
196 newplug = xmalloc (sizeof *newplug);
197 memset (newplug, 0, sizeof *newplug);
198 newplug->name = plugin;
199 newplug->dlhandle = dlopen (plugin, RTLD_NOW);
200 if (!newplug->dlhandle)
201 einfo (_("%P%F: %s: error loading plugin: %s\n"), plugin, dlerror ());
203 /* Chain on end, so when we run list it is in command-line order. */
204 *plugins_tail_chain_ptr = newplug;
205 plugins_tail_chain_ptr = &newplug->next;
207 /* Record it as current plugin for receiving args. */
208 last_plugin = newplug;
209 last_plugin_args_tail_chain_ptr = &newplug->args;
212 /* Accumulate option arguments for last-loaded plugin, or return
215 plugin_opt_plugin_arg (const char *arg)
217 plugin_arg_t *newarg;
220 return set_plugin_error (_("<no plugin>"));
222 /* Ignore -pass-through= from GCC driver. */
225 const char *p = arg + 1;
229 if (strncmp (p, "pass-through=", 13) == 0)
233 newarg = xmalloc (sizeof *newarg);
237 /* Chain on end to preserve command-line order. */
238 *last_plugin_args_tail_chain_ptr = newarg;
239 last_plugin_args_tail_chain_ptr = &newarg->next;
240 last_plugin->n_args++;
244 /* Create a dummy BFD. */
246 plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate)
250 bfd_use_reserved_id = 1;
251 abfd = bfd_create (concat (name, IRONLY_SUFFIX, (const char *) NULL),
255 abfd->flags |= BFD_LINKER_CREATED | BFD_PLUGIN;
256 bfd_set_arch_info (abfd, bfd_get_arch_info (srctemplate));
257 bfd_set_gp_size (abfd, bfd_get_gp_size (srctemplate));
258 if (bfd_make_writable (abfd)
259 && bfd_copy_private_bfd_data (srctemplate, abfd))
263 /* Create section to own the symbols. */
264 flags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY
265 | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE);
266 if (bfd_make_section_anyway_with_flags (abfd, ".text", flags))
270 einfo (_("could not create dummy IR bfd: %F%E\n"));
274 /* Check if the BFD passed in is an IR dummy object file. */
275 static inline bfd_boolean
276 is_ir_dummy_bfd (const bfd *abfd)
278 /* ABFD can sometimes legitimately be NULL, e.g. when called from one
279 of the linker callbacks for a symbol in the *ABS* or *UND* sections. */
280 return abfd != NULL && (abfd->flags & BFD_PLUGIN) != 0;
283 /* Helpers to convert between BFD and GOLD symbol formats. */
284 static enum ld_plugin_status
285 asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym,
286 const struct ld_plugin_symbol *ldsym)
288 flagword flags = BSF_NO_FLAGS;
289 struct bfd_section *section;
291 asym->the_bfd = abfd;
292 asym->name = (ldsym->version
293 ? concat (ldsym->name, "@", ldsym->version, (const char *) NULL)
303 if (ldsym->comdat_key)
305 char *name = concat (".gnu.linkonce.t.", ldsym->comdat_key,
306 (const char *) NULL);
307 section = bfd_get_section_by_name (abfd, name);
314 sflags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY
315 | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE
316 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD);
317 section = bfd_make_section_anyway_with_flags (abfd, name, sflags);
323 section = bfd_get_section_by_name (abfd, ".text");
330 section = bfd_und_section_ptr;
335 section = bfd_com_section_ptr;
336 asym->value = ldsym->size;
337 /* For ELF targets, set alignment of common symbol to 1. */
338 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
340 ((elf_symbol_type *) asym)->internal_elf_sym.st_shndx = SHN_COMMON;
341 ((elf_symbol_type *) asym)->internal_elf_sym.st_value = 1;
349 asym->section = section;
351 /* Visibility only applies on ELF targets. */
352 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
354 elf_symbol_type *elfsym = elf_symbol_from (abfd, asym);
355 unsigned char visibility;
358 einfo (_("%P%F: %s: non-ELF symbol in ELF BFD!\n"), asym->name);
359 switch (ldsym->visibility)
362 einfo (_("%P%F: unknown ELF symbol visibility: %d!\n"),
365 visibility = STV_DEFAULT;
368 visibility = STV_PROTECTED;
371 visibility = STV_INTERNAL;
374 visibility = STV_HIDDEN;
377 elfsym->internal_elf_sym.st_other
378 = (visibility | (elfsym->internal_elf_sym.st_other
379 & ~ELF_ST_VISIBILITY (-1)));
385 /* Register a claim-file handler. */
386 static enum ld_plugin_status
387 register_claim_file (ld_plugin_claim_file_handler handler)
389 ASSERT (called_plugin);
390 called_plugin->claim_file_handler = handler;
394 /* Register an all-symbols-read handler. */
395 static enum ld_plugin_status
396 register_all_symbols_read (ld_plugin_all_symbols_read_handler handler)
398 ASSERT (called_plugin);
399 called_plugin->all_symbols_read_handler = handler;
403 /* Register a cleanup handler. */
404 static enum ld_plugin_status
405 register_cleanup (ld_plugin_cleanup_handler handler)
407 ASSERT (called_plugin);
408 called_plugin->cleanup_handler = handler;
412 /* Add symbols from a plugin-claimed input file. */
413 static enum ld_plugin_status
414 add_symbols (void *handle, int nsyms, const struct ld_plugin_symbol *syms)
420 ASSERT (called_plugin);
421 symptrs = xmalloc (nsyms * sizeof *symptrs);
422 for (n = 0; n < nsyms; n++)
424 enum ld_plugin_status rv;
427 bfdsym = bfd_make_empty_symbol (abfd);
429 rv = asymbol_from_plugin_symbol (abfd, bfdsym, syms + n);
433 bfd_set_symtab (abfd, symptrs, nsyms);
437 /* Get the input file information with an open (possibly re-opened)
439 static enum ld_plugin_status
440 get_input_file (const void *handle ATTRIBUTE_UNUSED,
441 struct ld_plugin_input_file *file ATTRIBUTE_UNUSED)
443 ASSERT (called_plugin);
447 /* Get view of the input file. */
448 static enum ld_plugin_status
449 get_view (const void *handle ATTRIBUTE_UNUSED,
450 const void **viewp ATTRIBUTE_UNUSED)
452 ASSERT (called_plugin);
456 /* Release the input file. */
457 static enum ld_plugin_status
458 release_input_file (const void *handle ATTRIBUTE_UNUSED)
460 ASSERT (called_plugin);
464 /* Return TRUE if a defined symbol might be reachable from outside the
465 universe of claimed objects. */
466 static inline bfd_boolean
467 is_visible_from_outside (struct ld_plugin_symbol *lsym,
468 struct bfd_link_hash_entry *blhe)
470 struct bfd_sym_chain *sym;
472 if (link_info.relocatable)
474 if (link_info.export_dynamic || !link_info.executable)
476 /* Check if symbol is hidden by version script. */
477 if (bfd_hide_sym_by_version (link_info.version_info,
480 /* Only ELF symbols really have visibility. */
481 if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour)
483 struct elf_link_hash_entry *el = (struct elf_link_hash_entry *)blhe;
484 int vis = ELF_ST_VISIBILITY (el->other);
485 return vis == STV_DEFAULT || vis == STV_PROTECTED;
487 /* On non-ELF targets, we can safely make inferences by considering
488 what visibility the plugin would have liked to apply when it first
489 sent us the symbol. During ELF symbol processing, visibility only
490 ever becomes more restrictive, not less, when symbols are merged,
491 so this is a conservative estimate; it may give false positives,
492 declaring something visible from outside when it in fact would
493 not have been, but this will only lead to missed optimisation
494 opportunities during LTRANS at worst; it will not give false
495 negatives, which can lead to the disastrous conclusion that the
496 related symbol is IRONLY. (See GCC PR46319 for an example.) */
497 return (lsym->visibility == LDPV_DEFAULT
498 || lsym->visibility == LDPV_PROTECTED);
501 for (sym = &entry_symbol; sym != NULL; sym = sym->next)
503 && strcmp (sym->name, blhe->root.string) == 0)
509 /* Get the symbol resolution info for a plugin-claimed input file. */
510 static enum ld_plugin_status
511 get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms,
514 const bfd *abfd = handle;
517 ASSERT (called_plugin);
518 for (n = 0; n < nsyms; n++)
520 struct bfd_link_hash_entry *blhe;
524 if (syms[n].def != LDPK_UNDEF)
525 blhe = bfd_link_hash_lookup (link_info.hash, syms[n].name,
528 blhe = bfd_wrapped_link_hash_lookup (link_info.output_bfd, &link_info,
529 syms[n].name, FALSE, FALSE, TRUE);
536 /* Determine resolution from blhe type and symbol's original type. */
537 if (blhe->type == bfd_link_hash_undefined
538 || blhe->type == bfd_link_hash_undefweak)
543 if (blhe->type != bfd_link_hash_defined
544 && blhe->type != bfd_link_hash_defweak
545 && blhe->type != bfd_link_hash_common)
547 /* We should not have a new, indirect or warning symbol here. */
548 einfo ("%P%F: %s: plugin symbol table corrupt (sym type %d)\n",
549 called_plugin->name, blhe->type);
552 /* Find out which section owns the symbol. Since it's not undef,
553 it must have an owner; if it's not a common symbol, both defs
554 and weakdefs keep it in the same place. */
555 owner_sec = (blhe->type == bfd_link_hash_common
556 ? blhe->u.c.p->section
557 : blhe->u.def.section);
560 /* If it was originally undefined or common, then it has been
561 resolved; determine how. */
562 if (syms[n].def == LDPK_UNDEF
563 || syms[n].def == LDPK_WEAKUNDEF
564 || syms[n].def == LDPK_COMMON)
566 if (owner_sec->owner == link_info.output_bfd)
567 res = LDPR_RESOLVED_EXEC;
568 else if (owner_sec->owner == abfd)
569 res = LDPR_PREVAILING_DEF_IRONLY;
570 else if (is_ir_dummy_bfd (owner_sec->owner))
571 res = LDPR_RESOLVED_IR;
572 else if (owner_sec->owner != NULL
573 && (owner_sec->owner->flags & DYNAMIC) != 0)
574 res = LDPR_RESOLVED_DYN;
576 res = LDPR_RESOLVED_EXEC;
579 /* Was originally def, or weakdef. Does it prevail? If the
580 owner is the original dummy bfd that supplied it, then this
581 is the definition that has prevailed. */
582 else if (owner_sec->owner == link_info.output_bfd)
583 res = LDPR_PREEMPTED_REG;
584 else if (owner_sec->owner == abfd)
585 res = LDPR_PREVAILING_DEF_IRONLY;
587 /* Was originally def, weakdef, or common, but has been pre-empted. */
588 else if (is_ir_dummy_bfd (owner_sec->owner))
589 res = LDPR_PREEMPTED_IR;
591 res = LDPR_PREEMPTED_REG;
593 if (res == LDPR_PREVAILING_DEF_IRONLY)
595 /* We need to know if the sym is referenced from non-IR files. Or
596 even potentially-referenced, perhaps in a future final link if
597 this is a partial one, perhaps dynamically at load-time if the
598 symbol is externally visible. */
599 if (blhe->non_ir_ref)
600 res = LDPR_PREVAILING_DEF;
601 else if (is_visible_from_outside (&syms[n], blhe))
602 res = def_ironly_exp;
606 syms[n].resolution = res;
607 if (report_plugin_symbols)
608 einfo (_("%P: %B: symbol `%s' "
609 "definition: %d, visibility: %d, resolution: %d\n"),
611 syms[n].def, syms[n].visibility, res);
616 static enum ld_plugin_status
617 get_symbols_v1 (const void *handle, int nsyms, struct ld_plugin_symbol *syms)
619 return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF);
622 static enum ld_plugin_status
623 get_symbols_v2 (const void *handle, int nsyms, struct ld_plugin_symbol *syms)
625 return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF_IRONLY_EXP);
628 /* Add a new (real) input file generated by a plugin. */
629 static enum ld_plugin_status
630 add_input_file (const char *pathname)
632 ASSERT (called_plugin);
633 if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_file_enum,
639 /* Add a new (real) library required by a plugin. */
640 static enum ld_plugin_status
641 add_input_library (const char *pathname)
643 ASSERT (called_plugin);
644 if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_l_enum,
650 /* Set the extra library path to be used by libraries added via
651 add_input_library. */
652 static enum ld_plugin_status
653 set_extra_library_path (const char *path)
655 ASSERT (called_plugin);
656 ldfile_add_library_path (xstrdup (path), FALSE);
660 /* Issue a diagnostic message from a plugin. */
661 static enum ld_plugin_status
662 message (int level, const char *format, ...)
665 va_start (args, format);
670 vfinfo (stdout, format, args, FALSE);
674 vfinfo (stdout, format, args, TRUE);
681 char *newfmt = ACONCAT ((level == LDPL_FATAL ? "%P%F: " : "%P%X: ",
682 format, "\n", (const char *) NULL));
684 vfinfo (stderr, newfmt, args, TRUE);
694 /* Helper to size leading part of tv array and set it up. */
696 set_tv_header (struct ld_plugin_tv *tv)
701 static const unsigned int major = (unsigned)(BFD_VERSION / 100000000UL);
702 static const unsigned int minor = (unsigned)(BFD_VERSION / 1000000UL) % 100;
704 for (i = 0; i < tv_header_size; i++)
706 tv[i].tv_tag = tv_header_tags[i];
707 #define TVU(x) tv[i].tv_u.tv_ ## x
708 switch (tv[i].tv_tag)
711 TVU(message) = message;
713 case LDPT_API_VERSION:
714 TVU(val) = LD_PLUGIN_API_VERSION;
716 case LDPT_GNU_LD_VERSION:
717 TVU(val) = major * 100 + minor;
719 case LDPT_LINKER_OUTPUT:
720 TVU(val) = (link_info.relocatable
722 : (link_info.executable
723 ? (link_info.pie ? LDPO_PIE : LDPO_EXEC)
726 case LDPT_OUTPUT_NAME:
727 TVU(string) = output_filename;
729 case LDPT_REGISTER_CLAIM_FILE_HOOK:
730 TVU(register_claim_file) = register_claim_file;
732 case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK:
733 TVU(register_all_symbols_read) = register_all_symbols_read;
735 case LDPT_REGISTER_CLEANUP_HOOK:
736 TVU(register_cleanup) = register_cleanup;
738 case LDPT_ADD_SYMBOLS:
739 TVU(add_symbols) = add_symbols;
741 case LDPT_GET_INPUT_FILE:
742 TVU(get_input_file) = get_input_file;
745 TVU(get_view) = get_view;
747 case LDPT_RELEASE_INPUT_FILE:
748 TVU(release_input_file) = release_input_file;
750 case LDPT_GET_SYMBOLS:
751 TVU(get_symbols) = get_symbols_v1;
753 case LDPT_GET_SYMBOLS_V2:
754 TVU(get_symbols) = get_symbols_v2;
756 case LDPT_ADD_INPUT_FILE:
757 TVU(add_input_file) = add_input_file;
759 case LDPT_ADD_INPUT_LIBRARY:
760 TVU(add_input_library) = add_input_library;
762 case LDPT_SET_EXTRA_LIBRARY_PATH:
763 TVU(set_extra_library_path) = set_extra_library_path;
766 /* Added a new entry to the array without adding
767 a new case to set up its value is a bug. */
774 /* Append the per-plugin args list and trailing LDPT_NULL to tv. */
776 set_tv_plugin_args (plugin_t *plugin, struct ld_plugin_tv *tv)
778 plugin_arg_t *arg = plugin->args;
781 tv->tv_tag = LDPT_OPTION;
782 tv->tv_u.tv_string = arg->arg;
786 tv->tv_tag = LDPT_NULL;
790 /* Return true if any plugins are active this run. Only valid
791 after options have been processed. */
793 plugin_active_plugins_p (void)
795 return plugins_list != NULL;
798 /* Load up and initialise all plugins after argument parsing. */
800 plugin_load_plugins (void)
802 struct ld_plugin_tv *my_tv;
803 unsigned int max_args = 0;
804 plugin_t *curplug = plugins_list;
806 /* If there are no plugins, we need do nothing this run. */
810 /* First pass over plugins to find max # args needed so that we
811 can size and allocate the tv array. */
814 if (curplug->n_args > max_args)
815 max_args = curplug->n_args;
816 curplug = curplug->next;
819 /* Allocate tv array and initialise constant part. */
820 my_tv = xmalloc ((max_args + 1 + tv_header_size) * sizeof *my_tv);
821 set_tv_header (my_tv);
823 /* Pass over plugins again, activating them. */
824 curplug = plugins_list;
827 enum ld_plugin_status rv;
828 ld_plugin_onload onloadfn;
830 onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "onload");
832 onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "_onload");
834 einfo (_("%P%F: %s: error loading plugin: %s\n"),
835 curplug->name, dlerror ());
836 set_tv_plugin_args (curplug, &my_tv[tv_header_size]);
837 called_plugin = curplug;
838 rv = (*onloadfn) (my_tv);
839 called_plugin = NULL;
841 einfo (_("%P%F: %s: plugin error: %d\n"), curplug->name, rv);
842 curplug = curplug->next;
845 /* Since plugin(s) inited ok, assume they're going to want symbol
846 resolutions, which needs us to track which symbols are referenced
847 by non-IR files using the linker's notice callback. */
848 orig_notice_all = link_info.notice_all;
849 orig_callbacks = link_info.callbacks;
850 plugin_callbacks = *orig_callbacks;
851 plugin_callbacks.notice = &plugin_notice;
852 link_info.notice_all = TRUE;
853 link_info.lto_plugin_active = TRUE;
854 link_info.callbacks = &plugin_callbacks;
857 /* Call 'claim file' hook for all plugins. */
859 plugin_call_claim_file (const struct ld_plugin_input_file *file, int *claimed)
861 plugin_t *curplug = plugins_list;
863 if (no_more_claiming)
865 while (curplug && !*claimed)
867 if (curplug->claim_file_handler)
869 enum ld_plugin_status rv;
870 called_plugin = curplug;
871 rv = (*curplug->claim_file_handler) (file, claimed);
872 called_plugin = NULL;
874 set_plugin_error (curplug->name);
876 curplug = curplug->next;
878 return plugin_error_p () ? -1 : 0;
882 plugin_maybe_claim (struct ld_plugin_input_file *file,
883 lang_input_statement_type *entry)
887 /* We create a dummy BFD, initially empty, to house whatever symbols
888 the plugin may want to add. */
889 file->handle = plugin_get_ir_dummy_bfd (entry->the_bfd->filename,
891 if (plugin_call_claim_file (file, &claimed))
892 einfo (_("%P%F: %s: plugin reported error claiming file\n"),
893 plugin_error_plugin ());
894 /* fd belongs to us, not the plugin; but we don't need it. */
898 /* Discard the real file's BFD and substitute the dummy one. */
900 /* BFD archive handling caches elements so we can't call
901 bfd_close for archives. */
902 if (entry->the_bfd->my_archive == NULL)
903 bfd_close (entry->the_bfd);
904 entry->the_bfd = file->handle;
905 entry->flags.claimed = TRUE;
906 bfd_make_readable (entry->the_bfd);
910 /* If plugin didn't claim the file, we don't need the dummy bfd.
911 Can't avoid speculatively creating it, alas. */
912 bfd_close_all_done (file->handle);
913 entry->flags.claimed = FALSE;
917 /* Call 'all symbols read' hook for all plugins. */
919 plugin_call_all_symbols_read (void)
921 plugin_t *curplug = plugins_list;
923 /* Disable any further file-claiming. */
924 no_more_claiming = TRUE;
928 if (curplug->all_symbols_read_handler)
930 enum ld_plugin_status rv;
931 called_plugin = curplug;
932 rv = (*curplug->all_symbols_read_handler) ();
933 called_plugin = NULL;
935 set_plugin_error (curplug->name);
937 curplug = curplug->next;
939 return plugin_error_p () ? -1 : 0;
942 /* Call 'cleanup' hook for all plugins at exit. */
944 plugin_call_cleanup (void)
946 plugin_t *curplug = plugins_list;
949 if (curplug->cleanup_handler && !curplug->cleanup_done)
951 enum ld_plugin_status rv;
952 curplug->cleanup_done = TRUE;
953 called_plugin = curplug;
954 rv = (*curplug->cleanup_handler) ();
955 called_plugin = NULL;
957 info_msg (_("%P: %s: error in plugin cleanup: %d (ignored)\n"),
959 dlclose (curplug->dlhandle);
961 curplug = curplug->next;
965 /* To determine which symbols should be resolved LDPR_PREVAILING_DEF
966 and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as
967 the linker adds them to the linker hash table. Mark those
968 referenced from a non-IR file with non_ir_ref. We have to
969 notice_all symbols, because we won't necessarily know until later
970 which ones will be contributed by IR files. */
972 plugin_notice (struct bfd_link_info *info,
973 struct bfd_link_hash_entry *h,
974 struct bfd_link_hash_entry *inh,
980 struct bfd_link_hash_entry *orig_h = h;
986 if (h->type == bfd_link_hash_warning)
989 /* Nothing to do here if this def/ref is from an IR dummy BFD. */
990 if (is_ir_dummy_bfd (abfd))
993 /* Making an indirect symbol counts as a reference unless this
994 is a brand new symbol. */
995 else if (bfd_is_ind_section (section)
996 || (flags & BSF_INDIRECT) != 0)
998 /* ??? Some of this is questionable. See comments in
999 _bfd_generic_link_add_one_symbol for case IND. */
1000 if (h->type != bfd_link_hash_new)
1002 h->non_ir_ref = TRUE;
1003 inh->non_ir_ref = TRUE;
1005 else if (inh->type == bfd_link_hash_new)
1006 inh->non_ir_ref = TRUE;
1009 /* Nothing to do here for warning symbols. */
1010 else if ((flags & BSF_WARNING) != 0)
1013 /* Nothing to do here for constructor symbols. */
1014 else if ((flags & BSF_CONSTRUCTOR) != 0)
1017 /* If this is a ref, set non_ir_ref. */
1018 else if (bfd_is_und_section (section))
1020 /* Replace the undefined dummy bfd with the real one. */
1021 if ((h->type == bfd_link_hash_undefined
1022 || h->type == bfd_link_hash_undefweak)
1023 && (h->u.undef.abfd == NULL
1024 || (h->u.undef.abfd->flags & BFD_PLUGIN) != 0))
1025 h->u.undef.abfd = abfd;
1026 h->non_ir_ref = TRUE;
1029 /* Otherwise, it must be a new def. Ensure any symbol defined
1030 in an IR dummy BFD takes on a new value from a real BFD.
1031 Weak symbols are not normally overridden by a new weak
1032 definition, and strong symbols will normally cause multiple
1033 definition errors. Avoid this by making the symbol appear
1035 else if (((h->type == bfd_link_hash_defweak
1036 || h->type == bfd_link_hash_defined)
1037 && is_ir_dummy_bfd (sym_bfd = h->u.def.section->owner))
1038 || (h->type == bfd_link_hash_common
1039 && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner)))
1041 h->type = bfd_link_hash_undefweak;
1042 h->u.undef.abfd = sym_bfd;
1046 /* Continue with cref/nocrossref/trace-sym processing. */
1049 || (info->notice_hash != NULL
1050 && bfd_hash_lookup (info->notice_hash, orig_h->root.string,
1051 FALSE, FALSE) != NULL))
1052 return (*orig_callbacks->notice) (info, orig_h, inh,
1053 abfd, section, value, flags);