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 /* Generate a dummy BFD to represent an IR file, for any callers of
245 plugin_call_claim_file to use as the handle in the ld_plugin_input_file
246 struct that they build to pass in. The BFD is initially writable, so
247 that symbols can be added to it; it must be made readable after the
248 add_symbols hook has been called so that it can be read when linking. */
250 plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate)
254 bfd_use_reserved_id = 1;
255 abfd = bfd_create (concat (name, IRONLY_SUFFIX, (const char *) NULL),
259 abfd->flags |= BFD_LINKER_CREATED | BFD_PLUGIN;
260 bfd_set_arch_info (abfd, bfd_get_arch_info (srctemplate));
261 bfd_set_gp_size (abfd, bfd_get_gp_size (srctemplate));
262 if (bfd_make_writable (abfd)
263 && bfd_copy_private_bfd_data (srctemplate, abfd))
267 /* Create section to own the symbols. */
268 flags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY
269 | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE);
270 if (bfd_make_section_anyway_with_flags (abfd, ".text", flags))
274 einfo (_("could not create dummy IR bfd: %F%E\n"));
278 /* Check if the BFD passed in is an IR dummy object file. */
279 static inline bfd_boolean
280 is_ir_dummy_bfd (const bfd *abfd)
282 /* ABFD can sometimes legitimately be NULL, e.g. when called from one
283 of the linker callbacks for a symbol in the *ABS* or *UND* sections. */
284 return abfd != NULL && (abfd->flags & BFD_PLUGIN) != 0;
287 /* Helpers to convert between BFD and GOLD symbol formats. */
288 static enum ld_plugin_status
289 asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym,
290 const struct ld_plugin_symbol *ldsym)
292 flagword flags = BSF_NO_FLAGS;
293 struct bfd_section *section;
295 asym->the_bfd = abfd;
296 asym->name = (ldsym->version
297 ? concat (ldsym->name, "@", ldsym->version, (const char *) NULL)
307 if (ldsym->comdat_key)
309 char *name = concat (".gnu.linkonce.t.", ldsym->comdat_key,
310 (const char *) NULL);
311 section = bfd_get_section_by_name (abfd, name);
318 sflags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY
319 | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE
320 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD);
321 section = bfd_make_section_anyway_with_flags (abfd, name, sflags);
327 section = bfd_get_section_by_name (abfd, ".text");
334 section = bfd_und_section_ptr;
339 section = bfd_com_section_ptr;
340 asym->value = ldsym->size;
341 /* For ELF targets, set alignment of common symbol to 1. */
342 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
344 ((elf_symbol_type *) asym)->internal_elf_sym.st_shndx = SHN_COMMON;
345 ((elf_symbol_type *) asym)->internal_elf_sym.st_value = 1;
353 asym->section = section;
355 /* Visibility only applies on ELF targets. */
356 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
358 elf_symbol_type *elfsym = elf_symbol_from (abfd, asym);
359 unsigned char visibility;
362 einfo (_("%P%F: %s: non-ELF symbol in ELF BFD!\n"), asym->name);
363 switch (ldsym->visibility)
366 einfo (_("%P%F: unknown ELF symbol visibility: %d!\n"),
369 visibility = STV_DEFAULT;
372 visibility = STV_PROTECTED;
375 visibility = STV_INTERNAL;
378 visibility = STV_HIDDEN;
381 elfsym->internal_elf_sym.st_other
382 = (visibility | (elfsym->internal_elf_sym.st_other
383 & ~ELF_ST_VISIBILITY (-1)));
389 /* Register a claim-file handler. */
390 static enum ld_plugin_status
391 register_claim_file (ld_plugin_claim_file_handler handler)
393 ASSERT (called_plugin);
394 called_plugin->claim_file_handler = handler;
398 /* Register an all-symbols-read handler. */
399 static enum ld_plugin_status
400 register_all_symbols_read (ld_plugin_all_symbols_read_handler handler)
402 ASSERT (called_plugin);
403 called_plugin->all_symbols_read_handler = handler;
407 /* Register a cleanup handler. */
408 static enum ld_plugin_status
409 register_cleanup (ld_plugin_cleanup_handler handler)
411 ASSERT (called_plugin);
412 called_plugin->cleanup_handler = handler;
416 /* Add symbols from a plugin-claimed input file. */
417 static enum ld_plugin_status
418 add_symbols (void *handle, int nsyms, const struct ld_plugin_symbol *syms)
424 ASSERT (called_plugin);
425 symptrs = xmalloc (nsyms * sizeof *symptrs);
426 for (n = 0; n < nsyms; n++)
428 enum ld_plugin_status rv;
431 bfdsym = bfd_make_empty_symbol (abfd);
433 rv = asymbol_from_plugin_symbol (abfd, bfdsym, syms + n);
437 bfd_set_symtab (abfd, symptrs, nsyms);
441 /* Get the input file information with an open (possibly re-opened)
443 static enum ld_plugin_status
444 get_input_file (const void *handle ATTRIBUTE_UNUSED,
445 struct ld_plugin_input_file *file ATTRIBUTE_UNUSED)
447 ASSERT (called_plugin);
451 /* Get view of the input file. */
452 static enum ld_plugin_status
453 get_view (const void *handle ATTRIBUTE_UNUSED,
454 const void **viewp ATTRIBUTE_UNUSED)
456 ASSERT (called_plugin);
460 /* Release the input file. */
461 static enum ld_plugin_status
462 release_input_file (const void *handle ATTRIBUTE_UNUSED)
464 ASSERT (called_plugin);
468 /* Return TRUE if a defined symbol might be reachable from outside the
469 universe of claimed objects. */
470 static inline bfd_boolean
471 is_visible_from_outside (struct ld_plugin_symbol *lsym,
472 struct bfd_link_hash_entry *blhe)
474 struct bfd_sym_chain *sym;
476 if (link_info.relocatable)
478 if (link_info.export_dynamic || !link_info.executable)
480 /* Check if symbol is hidden by version script. */
481 if (bfd_hide_sym_by_version (link_info.version_info,
484 /* Only ELF symbols really have visibility. */
485 if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour)
487 struct elf_link_hash_entry *el = (struct elf_link_hash_entry *)blhe;
488 int vis = ELF_ST_VISIBILITY (el->other);
489 return vis == STV_DEFAULT || vis == STV_PROTECTED;
491 /* On non-ELF targets, we can safely make inferences by considering
492 what visibility the plugin would have liked to apply when it first
493 sent us the symbol. During ELF symbol processing, visibility only
494 ever becomes more restrictive, not less, when symbols are merged,
495 so this is a conservative estimate; it may give false positives,
496 declaring something visible from outside when it in fact would
497 not have been, but this will only lead to missed optimisation
498 opportunities during LTRANS at worst; it will not give false
499 negatives, which can lead to the disastrous conclusion that the
500 related symbol is IRONLY. (See GCC PR46319 for an example.) */
501 return (lsym->visibility == LDPV_DEFAULT
502 || lsym->visibility == LDPV_PROTECTED);
505 for (sym = &entry_symbol; sym != NULL; sym = sym->next)
507 && strcmp (sym->name, blhe->root.string) == 0)
513 /* Get the symbol resolution info for a plugin-claimed input file. */
514 static enum ld_plugin_status
515 get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms,
518 const bfd *abfd = handle;
521 ASSERT (called_plugin);
522 for (n = 0; n < nsyms; n++)
524 struct bfd_link_hash_entry *blhe;
528 if (syms[n].def != LDPK_UNDEF)
529 blhe = bfd_link_hash_lookup (link_info.hash, syms[n].name,
532 blhe = bfd_wrapped_link_hash_lookup (link_info.output_bfd, &link_info,
533 syms[n].name, FALSE, FALSE, TRUE);
540 /* Determine resolution from blhe type and symbol's original type. */
541 if (blhe->type == bfd_link_hash_undefined
542 || blhe->type == bfd_link_hash_undefweak)
547 if (blhe->type != bfd_link_hash_defined
548 && blhe->type != bfd_link_hash_defweak
549 && blhe->type != bfd_link_hash_common)
551 /* We should not have a new, indirect or warning symbol here. */
552 einfo ("%P%F: %s: plugin symbol table corrupt (sym type %d)\n",
553 called_plugin->name, blhe->type);
556 /* Find out which section owns the symbol. Since it's not undef,
557 it must have an owner; if it's not a common symbol, both defs
558 and weakdefs keep it in the same place. */
559 owner_sec = (blhe->type == bfd_link_hash_common
560 ? blhe->u.c.p->section
561 : blhe->u.def.section);
564 /* If it was originally undefined or common, then it has been
565 resolved; determine how. */
566 if (syms[n].def == LDPK_UNDEF
567 || syms[n].def == LDPK_WEAKUNDEF
568 || syms[n].def == LDPK_COMMON)
570 if (owner_sec->owner == link_info.output_bfd)
571 res = LDPR_RESOLVED_EXEC;
572 else if (owner_sec->owner == abfd)
573 res = LDPR_PREVAILING_DEF_IRONLY;
574 else if (is_ir_dummy_bfd (owner_sec->owner))
575 res = LDPR_RESOLVED_IR;
576 else if (owner_sec->owner != NULL
577 && (owner_sec->owner->flags & DYNAMIC) != 0)
578 res = LDPR_RESOLVED_DYN;
580 res = LDPR_RESOLVED_EXEC;
583 /* Was originally def, or weakdef. Does it prevail? If the
584 owner is the original dummy bfd that supplied it, then this
585 is the definition that has prevailed. */
586 else if (owner_sec->owner == link_info.output_bfd)
587 res = LDPR_PREEMPTED_REG;
588 else if (owner_sec->owner == abfd)
589 res = LDPR_PREVAILING_DEF_IRONLY;
591 /* Was originally def, weakdef, or common, but has been pre-empted. */
592 else if (is_ir_dummy_bfd (owner_sec->owner))
593 res = LDPR_PREEMPTED_IR;
595 res = LDPR_PREEMPTED_REG;
597 if (res == LDPR_PREVAILING_DEF_IRONLY)
599 /* We need to know if the sym is referenced from non-IR files. Or
600 even potentially-referenced, perhaps in a future final link if
601 this is a partial one, perhaps dynamically at load-time if the
602 symbol is externally visible. */
603 if (blhe->non_ir_ref)
604 res = LDPR_PREVAILING_DEF;
605 else if (is_visible_from_outside (&syms[n], blhe))
606 res = def_ironly_exp;
610 syms[n].resolution = res;
611 if (report_plugin_symbols)
612 einfo (_("%P: %B: symbol `%s' "
613 "definition: %d, visibility: %d, resolution: %d\n"),
615 syms[n].def, syms[n].visibility, res);
620 static enum ld_plugin_status
621 get_symbols_v1 (const void *handle, int nsyms, struct ld_plugin_symbol *syms)
623 return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF);
626 static enum ld_plugin_status
627 get_symbols_v2 (const void *handle, int nsyms, struct ld_plugin_symbol *syms)
629 return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF_IRONLY_EXP);
632 /* Add a new (real) input file generated by a plugin. */
633 static enum ld_plugin_status
634 add_input_file (const char *pathname)
636 ASSERT (called_plugin);
637 if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_file_enum,
643 /* Add a new (real) library required by a plugin. */
644 static enum ld_plugin_status
645 add_input_library (const char *pathname)
647 ASSERT (called_plugin);
648 if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_l_enum,
654 /* Set the extra library path to be used by libraries added via
655 add_input_library. */
656 static enum ld_plugin_status
657 set_extra_library_path (const char *path)
659 ASSERT (called_plugin);
660 ldfile_add_library_path (xstrdup (path), FALSE);
664 /* Issue a diagnostic message from a plugin. */
665 static enum ld_plugin_status
666 message (int level, const char *format, ...)
669 va_start (args, format);
674 vfinfo (stdout, format, args, FALSE);
678 vfinfo (stdout, format, args, TRUE);
685 char *newfmt = ACONCAT ((level == LDPL_FATAL ? "%P%F: " : "%P%X: ",
686 format, "\n", (const char *) NULL));
688 vfinfo (stderr, newfmt, args, TRUE);
698 /* Helper to size leading part of tv array and set it up. */
700 set_tv_header (struct ld_plugin_tv *tv)
705 static const unsigned int major = (unsigned)(BFD_VERSION / 100000000UL);
706 static const unsigned int minor = (unsigned)(BFD_VERSION / 1000000UL) % 100;
708 for (i = 0; i < tv_header_size; i++)
710 tv[i].tv_tag = tv_header_tags[i];
711 #define TVU(x) tv[i].tv_u.tv_ ## x
712 switch (tv[i].tv_tag)
715 TVU(message) = message;
717 case LDPT_API_VERSION:
718 TVU(val) = LD_PLUGIN_API_VERSION;
720 case LDPT_GNU_LD_VERSION:
721 TVU(val) = major * 100 + minor;
723 case LDPT_LINKER_OUTPUT:
724 TVU(val) = (link_info.relocatable
726 : (link_info.executable
727 ? (link_info.pie ? LDPO_PIE : LDPO_EXEC)
730 case LDPT_OUTPUT_NAME:
731 TVU(string) = output_filename;
733 case LDPT_REGISTER_CLAIM_FILE_HOOK:
734 TVU(register_claim_file) = register_claim_file;
736 case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK:
737 TVU(register_all_symbols_read) = register_all_symbols_read;
739 case LDPT_REGISTER_CLEANUP_HOOK:
740 TVU(register_cleanup) = register_cleanup;
742 case LDPT_ADD_SYMBOLS:
743 TVU(add_symbols) = add_symbols;
745 case LDPT_GET_INPUT_FILE:
746 TVU(get_input_file) = get_input_file;
749 TVU(get_view) = get_view;
751 case LDPT_RELEASE_INPUT_FILE:
752 TVU(release_input_file) = release_input_file;
754 case LDPT_GET_SYMBOLS:
755 TVU(get_symbols) = get_symbols_v1;
757 case LDPT_GET_SYMBOLS_V2:
758 TVU(get_symbols) = get_symbols_v2;
760 case LDPT_ADD_INPUT_FILE:
761 TVU(add_input_file) = add_input_file;
763 case LDPT_ADD_INPUT_LIBRARY:
764 TVU(add_input_library) = add_input_library;
766 case LDPT_SET_EXTRA_LIBRARY_PATH:
767 TVU(set_extra_library_path) = set_extra_library_path;
770 /* Added a new entry to the array without adding
771 a new case to set up its value is a bug. */
778 /* Append the per-plugin args list and trailing LDPT_NULL to tv. */
780 set_tv_plugin_args (plugin_t *plugin, struct ld_plugin_tv *tv)
782 plugin_arg_t *arg = plugin->args;
785 tv->tv_tag = LDPT_OPTION;
786 tv->tv_u.tv_string = arg->arg;
790 tv->tv_tag = LDPT_NULL;
794 /* Load up and initialise all plugins after argument parsing. */
796 plugin_load_plugins (void)
798 struct ld_plugin_tv *my_tv;
799 unsigned int max_args = 0;
800 plugin_t *curplug = plugins_list;
802 /* If there are no plugins, we need do nothing this run. */
806 /* First pass over plugins to find max # args needed so that we
807 can size and allocate the tv array. */
810 if (curplug->n_args > max_args)
811 max_args = curplug->n_args;
812 curplug = curplug->next;
815 /* Allocate tv array and initialise constant part. */
816 my_tv = xmalloc ((max_args + 1 + tv_header_size) * sizeof *my_tv);
817 set_tv_header (my_tv);
819 /* Pass over plugins again, activating them. */
820 curplug = plugins_list;
823 enum ld_plugin_status rv;
824 ld_plugin_onload onloadfn;
826 onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "onload");
828 onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "_onload");
830 einfo (_("%P%F: %s: error loading plugin: %s\n"),
831 curplug->name, dlerror ());
832 set_tv_plugin_args (curplug, &my_tv[tv_header_size]);
833 called_plugin = curplug;
834 rv = (*onloadfn) (my_tv);
835 called_plugin = NULL;
837 einfo (_("%P%F: %s: plugin error: %d\n"), curplug->name, rv);
838 curplug = curplug->next;
841 /* Since plugin(s) inited ok, assume they're going to want symbol
842 resolutions, which needs us to track which symbols are referenced
843 by non-IR files using the linker's notice callback. */
844 orig_notice_all = link_info.notice_all;
845 orig_callbacks = link_info.callbacks;
846 plugin_callbacks = *orig_callbacks;
847 plugin_callbacks.notice = &plugin_notice;
848 link_info.notice_all = TRUE;
849 link_info.lto_plugin_active = TRUE;
850 link_info.callbacks = &plugin_callbacks;
853 /* Call 'claim file' hook for all plugins. */
855 plugin_call_claim_file (const struct ld_plugin_input_file *file, int *claimed)
857 plugin_t *curplug = plugins_list;
859 if (no_more_claiming)
861 while (curplug && !*claimed)
863 if (curplug->claim_file_handler)
865 enum ld_plugin_status rv;
866 called_plugin = curplug;
867 rv = (*curplug->claim_file_handler) (file, claimed);
868 called_plugin = NULL;
870 set_plugin_error (curplug->name);
872 curplug = curplug->next;
874 return plugin_error_p () ? -1 : 0;
878 plugin_maybe_claim (struct ld_plugin_input_file *file,
879 lang_input_statement_type *entry)
883 /* We create a dummy BFD, initially empty, to house whatever symbols
884 the plugin may want to add. */
885 file->handle = plugin_get_ir_dummy_bfd (entry->the_bfd->filename,
887 if (plugin_call_claim_file (file, &claimed))
888 einfo (_("%P%F: %s: plugin reported error claiming file\n"),
889 plugin_error_plugin ());
890 /* fd belongs to us, not the plugin; but we don't need it. */
894 /* Discard the real file's BFD and substitute the dummy one. */
896 /* BFD archive handling caches elements so we can't call
897 bfd_close for archives. */
898 if (entry->the_bfd->my_archive == NULL)
899 bfd_close (entry->the_bfd);
900 entry->the_bfd = file->handle;
901 entry->flags.claimed = TRUE;
902 bfd_make_readable (entry->the_bfd);
906 /* If plugin didn't claim the file, we don't need the dummy bfd.
907 Can't avoid speculatively creating it, alas. */
908 bfd_close_all_done (file->handle);
909 entry->flags.claimed = FALSE;
913 /* Call 'all symbols read' hook for all plugins. */
915 plugin_call_all_symbols_read (void)
917 plugin_t *curplug = plugins_list;
919 /* Disable any further file-claiming. */
920 no_more_claiming = TRUE;
924 if (curplug->all_symbols_read_handler)
926 enum ld_plugin_status rv;
927 called_plugin = curplug;
928 rv = (*curplug->all_symbols_read_handler) ();
929 called_plugin = NULL;
931 set_plugin_error (curplug->name);
933 curplug = curplug->next;
935 return plugin_error_p () ? -1 : 0;
938 /* Call 'cleanup' hook for all plugins at exit. */
940 plugin_call_cleanup (void)
942 plugin_t *curplug = plugins_list;
945 if (curplug->cleanup_handler && !curplug->cleanup_done)
947 enum ld_plugin_status rv;
948 curplug->cleanup_done = TRUE;
949 called_plugin = curplug;
950 rv = (*curplug->cleanup_handler) ();
951 called_plugin = NULL;
953 info_msg (_("%P: %s: error in plugin cleanup: %d (ignored)\n"),
955 dlclose (curplug->dlhandle);
957 curplug = curplug->next;
961 /* To determine which symbols should be resolved LDPR_PREVAILING_DEF
962 and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as
963 the linker adds them to the linker hash table. Mark those
964 referenced from a non-IR file with non_ir_ref. We have to
965 notice_all symbols, because we won't necessarily know until later
966 which ones will be contributed by IR files. */
968 plugin_notice (struct bfd_link_info *info,
969 struct bfd_link_hash_entry *h,
970 struct bfd_link_hash_entry *inh,
976 struct bfd_link_hash_entry *orig_h = h;
982 if (h->type == bfd_link_hash_warning)
985 /* Nothing to do here if this def/ref is from an IR dummy BFD. */
986 if (is_ir_dummy_bfd (abfd))
989 /* Making an indirect symbol counts as a reference unless this
990 is a brand new symbol. */
991 else if (bfd_is_ind_section (section)
992 || (flags & BSF_INDIRECT) != 0)
994 /* ??? Some of this is questionable. See comments in
995 _bfd_generic_link_add_one_symbol for case IND. */
996 if (h->type != bfd_link_hash_new)
998 h->non_ir_ref = TRUE;
999 inh->non_ir_ref = TRUE;
1001 else if (inh->type == bfd_link_hash_new)
1002 inh->non_ir_ref = TRUE;
1005 /* Nothing to do here for warning symbols. */
1006 else if ((flags & BSF_WARNING) != 0)
1009 /* Nothing to do here for constructor symbols. */
1010 else if ((flags & BSF_CONSTRUCTOR) != 0)
1013 /* If this is a ref, set non_ir_ref. */
1014 else if (bfd_is_und_section (section))
1016 /* Replace the undefined dummy bfd with the real one. */
1017 if ((h->type == bfd_link_hash_undefined
1018 || h->type == bfd_link_hash_undefweak)
1019 && (h->u.undef.abfd == NULL
1020 || (h->u.undef.abfd->flags & BFD_PLUGIN) != 0))
1021 h->u.undef.abfd = abfd;
1022 h->non_ir_ref = TRUE;
1025 /* Otherwise, it must be a new def. Ensure any symbol defined
1026 in an IR dummy BFD takes on a new value from a real BFD.
1027 Weak symbols are not normally overridden by a new weak
1028 definition, and strong symbols will normally cause multiple
1029 definition errors. Avoid this by making the symbol appear
1031 else if (((h->type == bfd_link_hash_defweak
1032 || h->type == bfd_link_hash_defined)
1033 && is_ir_dummy_bfd (sym_bfd = h->u.def.section->owner))
1034 || (h->type == bfd_link_hash_common
1035 && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner)))
1037 h->type = bfd_link_hash_undefweak;
1038 h->u.undef.abfd = sym_bfd;
1042 /* Continue with cref/nocrossref/trace-sym processing. */
1045 || (info->notice_hash != NULL
1046 && bfd_hash_lookup (info->notice_hash, orig_h->root.string,
1047 FALSE, FALSE) != NULL))
1048 return (*orig_callbacks->notice) (info, orig_h, inh,
1049 abfd, section, value, flags);