1 /* Plugin control for the GNU linker.
2 Copyright 2010, 2011 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"
36 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
40 /* Report plugin symbols. */
41 bfd_boolean report_plugin_symbols
;
43 /* The suffix to append to the name of the real (claimed) object file
44 when generating a dummy BFD to hold the IR symbols sent from the
45 plugin. For cosmetic use only; appears in maps, crefs etc. */
46 #define IRONLY_SUFFIX " (symbol from plugin)"
48 /* Stores a single argument passed to a plugin. */
49 typedef struct plugin_arg
51 struct plugin_arg
*next
;
55 /* Holds all details of a single plugin. */
58 /* Next on the list of plugins, or NULL at end of chain. */
60 /* The argument string given to --plugin. */
62 /* The shared library handle returned by dlopen. */
64 /* The list of argument string given to --plugin-opt. */
66 /* Number of args in the list, for convenience. */
68 /* The plugin's event handlers. */
69 ld_plugin_claim_file_handler claim_file_handler
;
70 ld_plugin_all_symbols_read_handler all_symbols_read_handler
;
71 ld_plugin_cleanup_handler cleanup_handler
;
72 /* TRUE if the cleanup handlers have been called. */
73 bfd_boolean cleanup_done
;
76 /* The master list of all plugins. */
77 static plugin_t
*plugins_list
= NULL
;
79 /* We keep a tail pointer for easy linking on the end. */
80 static plugin_t
**plugins_tail_chain_ptr
= &plugins_list
;
82 /* The last plugin added to the list, for receiving args. */
83 static plugin_t
*last_plugin
= NULL
;
85 /* The tail of the arg chain of the last plugin added to the list. */
86 static plugin_arg_t
**last_plugin_args_tail_chain_ptr
= NULL
;
88 /* The plugin which is currently having a callback executed. */
89 static plugin_t
*called_plugin
= NULL
;
91 /* Last plugin to cause an error, if any. */
92 static const char *error_plugin
= NULL
;
94 /* State of linker "notice" interface before we poked at it. */
95 static bfd_boolean orig_notice_all
;
97 /* Original linker callbacks, and the plugin version. */
98 static const struct bfd_link_callbacks
*orig_callbacks
;
99 static struct bfd_link_callbacks plugin_callbacks
;
101 /* Set at all symbols read time, to avoid recursively offering the plugin
102 its own newly-added input files and libs to claim. */
103 bfd_boolean no_more_claiming
= FALSE
;
105 /* List of tags to set in the constant leading part of the tv array. */
106 static const enum ld_plugin_tag tv_header_tags
[] =
113 LDPT_REGISTER_CLAIM_FILE_HOOK
,
114 LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK
,
115 LDPT_REGISTER_CLEANUP_HOOK
,
118 LDPT_RELEASE_INPUT_FILE
,
121 LDPT_ADD_INPUT_LIBRARY
,
122 LDPT_SET_EXTRA_LIBRARY_PATH
125 /* How many entries in the constant leading part of the tv array. */
126 static const size_t tv_header_size
= ARRAY_SIZE (tv_header_tags
);
128 /* Forward references. */
129 static bfd_boolean
plugin_notice (struct bfd_link_info
*,
130 struct bfd_link_hash_entry
*, bfd
*,
131 asection
*, bfd_vma
, flagword
, const char *);
133 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
135 #define RTLD_NOW 0 /* Dummy value. */
138 dlopen (const char *file
, int mode ATTRIBUTE_UNUSED
)
140 return LoadLibrary (file
);
144 dlsym (void *handle
, const char *name
)
146 return GetProcAddress (handle
, name
);
150 dlclose (void *handle
)
152 FreeLibrary (handle
);
156 #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */
158 /* Helper function for exiting with error status. */
160 set_plugin_error (const char *plugin
)
162 error_plugin
= plugin
;
166 /* Test if an error occurred. */
168 plugin_error_p (void)
170 return error_plugin
!= NULL
;
173 /* Return name of plugin which caused an error if any. */
175 plugin_error_plugin (void)
177 return error_plugin
? error_plugin
: _("<no plugin>");
180 /* Handle -plugin arg: find and load plugin, or return error. */
182 plugin_opt_plugin (const char *plugin
)
186 newplug
= xmalloc (sizeof *newplug
);
187 memset (newplug
, 0, sizeof *newplug
);
188 newplug
->name
= plugin
;
189 newplug
->dlhandle
= dlopen (plugin
, RTLD_NOW
);
190 if (!newplug
->dlhandle
)
191 return set_plugin_error (plugin
);
193 /* Chain on end, so when we run list it is in command-line order. */
194 *plugins_tail_chain_ptr
= newplug
;
195 plugins_tail_chain_ptr
= &newplug
->next
;
197 /* Record it as current plugin for receiving args. */
198 last_plugin
= newplug
;
199 last_plugin_args_tail_chain_ptr
= &newplug
->args
;
203 /* Accumulate option arguments for last-loaded plugin, or return
206 plugin_opt_plugin_arg (const char *arg
)
208 plugin_arg_t
*newarg
;
211 return set_plugin_error (_("<no plugin>"));
213 newarg
= xmalloc (sizeof *newarg
);
217 /* Chain on end to preserve command-line order. */
218 *last_plugin_args_tail_chain_ptr
= newarg
;
219 last_plugin_args_tail_chain_ptr
= &newarg
->next
;
220 last_plugin
->n_args
++;
224 /* Create a dummy BFD. */
226 plugin_get_ir_dummy_bfd (const char *name
, bfd
*srctemplate
)
230 bfd_use_reserved_id
= 1;
231 abfd
= bfd_create (concat (name
, IRONLY_SUFFIX
, (const char *) NULL
),
235 abfd
->flags
|= BFD_LINKER_CREATED
| BFD_PLUGIN
;
236 bfd_set_arch_info (abfd
, bfd_get_arch_info (srctemplate
));
237 bfd_set_gp_size (abfd
, bfd_get_gp_size (srctemplate
));
238 if (bfd_make_writable (abfd
)
239 && bfd_copy_private_bfd_data (srctemplate
, abfd
))
243 /* Create sections to own the symbols. */
244 flags
= (SEC_CODE
| SEC_HAS_CONTENTS
| SEC_READONLY
245 | SEC_ALLOC
| SEC_LOAD
| SEC_KEEP
| SEC_EXCLUDE
);
246 if (bfd_make_section_anyway_with_flags (abfd
, ".text", flags
))
250 einfo (_("could not create dummy IR bfd: %F%E\n"));
254 /* Check if the BFD passed in is an IR dummy object file. */
256 is_ir_dummy_bfd (const bfd
*abfd
)
258 /* ABFD can sometimes legitimately be NULL, e.g. when called from one
259 of the linker callbacks for a symbol in the *ABS* or *UND* sections.
260 Likewise, the usrdata field may be NULL if ABFD was added by the
261 backend without a corresponding input statement, as happens e.g.
262 when processing DT_NEEDED dependencies. */
265 && ((lang_input_statement_type
*)(abfd
->usrdata
))->claimed
);
268 /* Helpers to convert between BFD and GOLD symbol formats. */
269 static enum ld_plugin_status
270 asymbol_from_plugin_symbol (bfd
*abfd
, asymbol
*asym
,
271 const struct ld_plugin_symbol
*ldsym
)
273 flagword flags
= BSF_NO_FLAGS
;
274 struct bfd_section
*section
;
276 asym
->the_bfd
= abfd
;
277 asym
->name
= (ldsym
->version
278 ? concat (ldsym
->name
, "@", ldsym
->version
, (const char *) NULL
)
288 section
= bfd_get_section_by_name (abfd
, ".text");
295 section
= bfd_und_section_ptr
;
300 section
= bfd_com_section_ptr
;
301 asym
->value
= ldsym
->size
;
302 /* For ELF targets, set alignment of common symbol to 1. */
303 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
305 ((elf_symbol_type
*) asym
)->internal_elf_sym
.st_shndx
= SHN_COMMON
;
306 ((elf_symbol_type
*) asym
)->internal_elf_sym
.st_value
= 1;
314 asym
->section
= section
;
316 /* Visibility only applies on ELF targets. */
317 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
319 elf_symbol_type
*elfsym
= elf_symbol_from (abfd
, asym
);
320 unsigned char visibility
;
323 einfo (_("%P%F: %s: non-ELF symbol in ELF BFD!\n"), asym
->name
);
324 switch (ldsym
->visibility
)
327 einfo (_("%P%F: unknown ELF symbol visibility: %d!\n"),
330 visibility
= STV_DEFAULT
;
333 visibility
= STV_PROTECTED
;
336 visibility
= STV_INTERNAL
;
339 visibility
= STV_HIDDEN
;
342 elfsym
->internal_elf_sym
.st_other
343 = (visibility
| (elfsym
->internal_elf_sym
.st_other
344 & ~ELF_ST_VISIBILITY (-1)));
350 /* Register a claim-file handler. */
351 static enum ld_plugin_status
352 register_claim_file (ld_plugin_claim_file_handler handler
)
354 ASSERT (called_plugin
);
355 called_plugin
->claim_file_handler
= handler
;
359 /* Register an all-symbols-read handler. */
360 static enum ld_plugin_status
361 register_all_symbols_read (ld_plugin_all_symbols_read_handler handler
)
363 ASSERT (called_plugin
);
364 called_plugin
->all_symbols_read_handler
= handler
;
368 /* Register a cleanup handler. */
369 static enum ld_plugin_status
370 register_cleanup (ld_plugin_cleanup_handler handler
)
372 ASSERT (called_plugin
);
373 called_plugin
->cleanup_handler
= handler
;
377 /* Add symbols from a plugin-claimed input file. */
378 static enum ld_plugin_status
379 add_symbols (void *handle
, int nsyms
, const struct ld_plugin_symbol
*syms
)
385 ASSERT (called_plugin
);
386 symptrs
= xmalloc (nsyms
* sizeof *symptrs
);
387 for (n
= 0; n
< nsyms
; n
++)
389 enum ld_plugin_status rv
;
392 if (syms
[n
].comdat_key
)
394 struct already_linked linked
;
395 linked
.comdat_key
= xstrdup (syms
[n
].comdat_key
);
396 linked
.u
.abfd
= abfd
;
397 bfd_section_already_linked (abfd
, &linked
, &link_info
);
399 bfdsym
= bfd_make_empty_symbol (abfd
);
401 rv
= asymbol_from_plugin_symbol (abfd
, bfdsym
, syms
+ n
);
405 bfd_set_symtab (abfd
, symptrs
, nsyms
);
409 /* Get the input file information with an open (possibly re-opened)
411 static enum ld_plugin_status
412 get_input_file (const void *handle
, struct ld_plugin_input_file
*file
)
414 ASSERT (called_plugin
);
420 /* Release the input file. */
421 static enum ld_plugin_status
422 release_input_file (const void *handle
)
424 ASSERT (called_plugin
);
429 /* Return TRUE if a defined symbol might be reachable from outside the
430 universe of claimed objects. */
431 static inline bfd_boolean
432 is_visible_from_outside (struct ld_plugin_symbol
*lsym
, asection
*section
,
433 struct bfd_link_hash_entry
*blhe
)
435 struct bfd_sym_chain
*sym
;
437 /* Section's owner may be NULL if it is the absolute
438 section, fortunately is_ir_dummy_bfd handles that. */
439 if (!is_ir_dummy_bfd (section
->owner
))
441 if (link_info
.relocatable
)
443 if (link_info
.export_dynamic
|| link_info
.shared
)
445 /* Only ELF symbols really have visibility. */
446 if (bfd_get_flavour (link_info
.output_bfd
) == bfd_target_elf_flavour
)
448 struct elf_link_hash_entry
*el
= (struct elf_link_hash_entry
*)blhe
;
449 int vis
= ELF_ST_VISIBILITY (el
->other
);
450 return vis
== STV_DEFAULT
|| vis
== STV_PROTECTED
;
452 /* On non-ELF targets, we can safely make inferences by considering
453 what visibility the plugin would have liked to apply when it first
454 sent us the symbol. During ELF symbol processing, visibility only
455 ever becomes more restrictive, not less, when symbols are merged,
456 so this is a conservative estimate; it may give false positives,
457 declaring something visible from outside when it in fact would
458 not have been, but this will only lead to missed optimisation
459 opportunities during LTRANS at worst; it will not give false
460 negatives, which can lead to the disastrous conclusion that the
461 related symbol is IRONLY. (See GCC PR46319 for an example.) */
462 return (lsym
->visibility
== LDPV_DEFAULT
463 || lsym
->visibility
== LDPV_PROTECTED
);
466 for (sym
= &entry_symbol
; sym
!= NULL
; sym
= sym
->next
)
468 && strcmp (sym
->name
, blhe
->root
.string
) == 0)
474 /* Get the symbol resolution info for a plugin-claimed input file. */
475 static enum ld_plugin_status
476 get_symbols (const void *handle
, int nsyms
, struct ld_plugin_symbol
*syms
)
478 const bfd
*abfd
= handle
;
480 ASSERT (called_plugin
);
481 for (n
= 0; n
< nsyms
; n
++)
483 struct bfd_link_hash_entry
*blhe
;
486 if (syms
[n
].def
!= LDPK_UNDEF
)
487 blhe
= bfd_link_hash_lookup (link_info
.hash
, syms
[n
].name
,
490 blhe
= bfd_wrapped_link_hash_lookup (link_info
.output_bfd
, &link_info
,
491 syms
[n
].name
, FALSE
, FALSE
, TRUE
);
494 syms
[n
].resolution
= LDPR_UNKNOWN
;
498 /* Determine resolution from blhe type and symbol's original type. */
499 if (blhe
->type
== bfd_link_hash_undefined
500 || blhe
->type
== bfd_link_hash_undefweak
)
502 syms
[n
].resolution
= LDPR_UNDEF
;
505 if (blhe
->type
!= bfd_link_hash_defined
506 && blhe
->type
!= bfd_link_hash_defweak
507 && blhe
->type
!= bfd_link_hash_common
)
509 /* We should not have a new, indirect or warning symbol here. */
510 einfo ("%P%F: %s: plugin symbol table corrupt (sym type %d)\n",
511 called_plugin
->name
, blhe
->type
);
514 /* Find out which section owns the symbol. Since it's not undef,
515 it must have an owner; if it's not a common symbol, both defs
516 and weakdefs keep it in the same place. */
517 owner_sec
= (blhe
->type
== bfd_link_hash_common
518 ? blhe
->u
.c
.p
->section
519 : blhe
->u
.def
.section
);
521 /* We need to know if the sym is referenced from non-IR files. Or
522 even potentially-referenced, perhaps in a future final link if
523 this is a partial one, perhaps dynamically at load-time if the
524 symbol is externally visible. */
525 ironly
= !(blhe
->non_ir_ref
526 || is_visible_from_outside (&syms
[n
], owner_sec
, blhe
));
528 /* If it was originally undefined or common, then it has been
529 resolved; determine how. */
530 if (syms
[n
].def
== LDPK_UNDEF
531 || syms
[n
].def
== LDPK_WEAKUNDEF
532 || syms
[n
].def
== LDPK_COMMON
)
534 if (owner_sec
->owner
== link_info
.output_bfd
)
535 syms
[n
].resolution
= LDPR_RESOLVED_EXEC
;
536 else if (owner_sec
->owner
== abfd
)
537 syms
[n
].resolution
= (ironly
538 ? LDPR_PREVAILING_DEF_IRONLY
539 : LDPR_PREVAILING_DEF
);
540 else if (is_ir_dummy_bfd (owner_sec
->owner
))
541 syms
[n
].resolution
= LDPR_RESOLVED_IR
;
542 else if (owner_sec
->owner
!= NULL
543 && (owner_sec
->owner
->flags
& DYNAMIC
) != 0)
544 syms
[n
].resolution
= LDPR_RESOLVED_DYN
;
546 syms
[n
].resolution
= LDPR_RESOLVED_EXEC
;
550 /* Was originally def, or weakdef. Does it prevail? If the
551 owner is the original dummy bfd that supplied it, then this
552 is the definition that has prevailed. */
553 if (owner_sec
->owner
== link_info
.output_bfd
)
554 syms
[n
].resolution
= LDPR_PREEMPTED_REG
;
555 else if (owner_sec
->owner
== abfd
)
557 syms
[n
].resolution
= (ironly
558 ? LDPR_PREVAILING_DEF_IRONLY
559 : LDPR_PREVAILING_DEF
);
563 /* Was originally def, weakdef, or common, but has been pre-empted. */
564 syms
[n
].resolution
= (is_ir_dummy_bfd (owner_sec
->owner
)
566 : LDPR_PREEMPTED_REG
);
569 if (report_plugin_symbols
)
570 einfo (_("%P: %B: symbol `%s' "
571 "definition: %d, visibility: %d, resolution: %d\n"),
573 syms
[n
].def
, syms
[n
].visibility
, syms
[n
].resolution
);
578 /* Add a new (real) input file generated by a plugin. */
579 static enum ld_plugin_status
580 add_input_file (const char *pathname
)
582 ASSERT (called_plugin
);
583 if (!lang_add_input_file (xstrdup (pathname
), lang_input_file_is_file_enum
,
589 /* Add a new (real) library required by a plugin. */
590 static enum ld_plugin_status
591 add_input_library (const char *pathname
)
593 ASSERT (called_plugin
);
594 if (!lang_add_input_file (xstrdup (pathname
), lang_input_file_is_l_enum
,
600 /* Set the extra library path to be used by libraries added via
601 add_input_library. */
602 static enum ld_plugin_status
603 set_extra_library_path (const char *path
)
605 ASSERT (called_plugin
);
606 ldfile_add_library_path (xstrdup (path
), FALSE
);
610 /* Issue a diagnostic message from a plugin. */
611 static enum ld_plugin_status
612 message (int level
, const char *format
, ...)
615 va_start (args
, format
);
620 vfinfo (stdout
, format
, args
, FALSE
);
624 vfinfo (stdout
, format
, args
, TRUE
);
631 char *newfmt
= ACONCAT ((level
== LDPL_FATAL
? "%P%F: " : "%P%X: ",
632 format
, "\n", (const char *) NULL
));
634 vfinfo (stderr
, newfmt
, args
, TRUE
);
644 /* Helper to size leading part of tv array and set it up. */
646 set_tv_header (struct ld_plugin_tv
*tv
)
651 static const unsigned int major
= (unsigned)(BFD_VERSION
/ 100000000UL);
652 static const unsigned int minor
= (unsigned)(BFD_VERSION
/ 1000000UL) % 100;
655 return tv_header_size
;
657 for (i
= 0; i
< tv_header_size
; i
++)
659 tv
[i
].tv_tag
= tv_header_tags
[i
];
660 #define TVU(x) tv[i].tv_u.tv_ ## x
661 switch (tv
[i
].tv_tag
)
664 TVU(message
) = message
;
666 case LDPT_API_VERSION
:
667 TVU(val
) = LD_PLUGIN_API_VERSION
;
669 case LDPT_GNU_LD_VERSION
:
670 TVU(val
) = major
* 100 + minor
;
672 case LDPT_LINKER_OUTPUT
:
673 TVU(val
) = (link_info
.relocatable
675 : (link_info
.shared
? LDPO_DYN
: LDPO_EXEC
));
677 case LDPT_OUTPUT_NAME
:
678 TVU(string
) = output_filename
;
680 case LDPT_REGISTER_CLAIM_FILE_HOOK
:
681 TVU(register_claim_file
) = register_claim_file
;
683 case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK
:
684 TVU(register_all_symbols_read
) = register_all_symbols_read
;
686 case LDPT_REGISTER_CLEANUP_HOOK
:
687 TVU(register_cleanup
) = register_cleanup
;
689 case LDPT_ADD_SYMBOLS
:
690 TVU(add_symbols
) = add_symbols
;
692 case LDPT_GET_INPUT_FILE
:
693 TVU(get_input_file
) = get_input_file
;
695 case LDPT_RELEASE_INPUT_FILE
:
696 TVU(release_input_file
) = release_input_file
;
698 case LDPT_GET_SYMBOLS
:
699 TVU(get_symbols
) = get_symbols
;
701 case LDPT_ADD_INPUT_FILE
:
702 TVU(add_input_file
) = add_input_file
;
704 case LDPT_ADD_INPUT_LIBRARY
:
705 TVU(add_input_library
) = add_input_library
;
707 case LDPT_SET_EXTRA_LIBRARY_PATH
:
708 TVU(set_extra_library_path
) = set_extra_library_path
;
711 /* Added a new entry to the array without adding
712 a new case to set up its value is a bug. */
717 return tv_header_size
;
720 /* Append the per-plugin args list and trailing LDPT_NULL to tv. */
722 set_tv_plugin_args (plugin_t
*plugin
, struct ld_plugin_tv
*tv
)
724 plugin_arg_t
*arg
= plugin
->args
;
727 tv
->tv_tag
= LDPT_OPTION
;
728 tv
->tv_u
.tv_string
= arg
->arg
;
732 tv
->tv_tag
= LDPT_NULL
;
736 /* Return true if any plugins are active this run. Only valid
737 after options have been processed. */
739 plugin_active_plugins_p (void)
741 return plugins_list
!= NULL
;
744 /* Load up and initialise all plugins after argument parsing. */
746 plugin_load_plugins (void)
748 struct ld_plugin_tv
*my_tv
;
749 unsigned int max_args
= 0;
750 plugin_t
*curplug
= plugins_list
;
752 /* If there are no plugins, we need do nothing this run. */
756 /* First pass over plugins to find max # args needed so that we
757 can size and allocate the tv array. */
760 if (curplug
->n_args
> max_args
)
761 max_args
= curplug
->n_args
;
762 curplug
= curplug
->next
;
765 /* Allocate tv array and initialise constant part. */
766 my_tv
= xmalloc ((max_args
+ 1 + tv_header_size
) * sizeof *my_tv
);
767 set_tv_header (my_tv
);
769 /* Pass over plugins again, activating them. */
770 curplug
= plugins_list
;
773 enum ld_plugin_status rv
;
774 ld_plugin_onload onloadfn
= dlsym (curplug
->dlhandle
, "onload");
776 onloadfn
= dlsym (curplug
->dlhandle
, "_onload");
778 return set_plugin_error (curplug
->name
);
779 set_tv_plugin_args (curplug
, &my_tv
[tv_header_size
]);
780 called_plugin
= curplug
;
781 rv
= (*onloadfn
) (my_tv
);
782 called_plugin
= NULL
;
784 return set_plugin_error (curplug
->name
);
785 curplug
= curplug
->next
;
788 /* Since plugin(s) inited ok, assume they're going to want symbol
789 resolutions, which needs us to track which symbols are referenced
790 by non-IR files using the linker's notice callback. */
791 orig_notice_all
= link_info
.notice_all
;
792 orig_callbacks
= link_info
.callbacks
;
793 plugin_callbacks
= *orig_callbacks
;
794 plugin_callbacks
.notice
= &plugin_notice
;
795 link_info
.notice_all
= TRUE
;
796 link_info
.callbacks
= &plugin_callbacks
;
801 /* Call 'claim file' hook for all plugins. */
803 plugin_call_claim_file (const struct ld_plugin_input_file
*file
, int *claimed
)
805 plugin_t
*curplug
= plugins_list
;
807 if (no_more_claiming
)
809 while (curplug
&& !*claimed
)
811 if (curplug
->claim_file_handler
)
813 enum ld_plugin_status rv
;
814 called_plugin
= curplug
;
815 rv
= (*curplug
->claim_file_handler
) (file
, claimed
);
816 called_plugin
= NULL
;
818 set_plugin_error (curplug
->name
);
820 curplug
= curplug
->next
;
822 return plugin_error_p () ? -1 : 0;
826 plugin_maybe_claim (struct ld_plugin_input_file
*file
,
827 lang_input_statement_type
*entry
)
831 /* We create a dummy BFD, initially empty, to house whatever symbols
832 the plugin may want to add. */
833 file
->handle
= plugin_get_ir_dummy_bfd (entry
->the_bfd
->filename
,
835 if (plugin_call_claim_file (file
, &claimed
))
836 einfo (_("%P%F: %s: plugin reported error claiming file\n"),
837 plugin_error_plugin ());
838 /* fd belongs to us, not the plugin; but we don't need it. */
842 /* Discard the real file's BFD and substitute the dummy one. */
844 /* BFD archive handling caches elements so we can't call
845 bfd_close for archives. */
846 if (entry
->the_bfd
->my_archive
== NULL
)
847 bfd_close (entry
->the_bfd
);
848 entry
->the_bfd
= file
->handle
;
849 entry
->claimed
= TRUE
;
850 bfd_make_readable (entry
->the_bfd
);
854 /* If plugin didn't claim the file, we don't need the dummy bfd.
855 Can't avoid speculatively creating it, alas. */
856 bfd_close_all_done (file
->handle
);
857 entry
->claimed
= FALSE
;
861 /* Call 'all symbols read' hook for all plugins. */
863 plugin_call_all_symbols_read (void)
865 plugin_t
*curplug
= plugins_list
;
867 /* Disable any further file-claiming. */
868 no_more_claiming
= TRUE
;
872 if (curplug
->all_symbols_read_handler
)
874 enum ld_plugin_status rv
;
875 called_plugin
= curplug
;
876 rv
= (*curplug
->all_symbols_read_handler
) ();
877 called_plugin
= NULL
;
879 set_plugin_error (curplug
->name
);
881 curplug
= curplug
->next
;
883 return plugin_error_p () ? -1 : 0;
886 /* Call 'cleanup' hook for all plugins at exit. */
888 plugin_call_cleanup (void)
890 plugin_t
*curplug
= plugins_list
;
893 if (curplug
->cleanup_handler
&& !curplug
->cleanup_done
)
895 enum ld_plugin_status rv
;
896 curplug
->cleanup_done
= TRUE
;
897 called_plugin
= curplug
;
898 rv
= (*curplug
->cleanup_handler
) ();
899 called_plugin
= NULL
;
901 set_plugin_error (curplug
->name
);
902 dlclose (curplug
->dlhandle
);
904 curplug
= curplug
->next
;
906 if (plugin_error_p ())
907 info_msg (_("%P: %s: error in plugin cleanup (ignored)\n"),
908 plugin_error_plugin ());
911 /* To determine which symbols should be resolved LDPR_PREVAILING_DEF
912 and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as
913 the linker adds them to the linker hash table. Mark those
914 referenced from a non-IR file with non_ir_ref. We have to
915 notice_all symbols, because we won't necessarily know until later
916 which ones will be contributed by IR files. */
918 plugin_notice (struct bfd_link_info
*info
,
919 struct bfd_link_hash_entry
*h
,
930 /* No further processing if this def/ref is from an IR dummy BFD. */
931 if (is_ir_dummy_bfd (abfd
))
934 /* Making an indirect symbol counts as a reference unless this
935 is a brand new symbol. */
936 if (bfd_is_ind_section (section
)
937 || (flags
& BSF_INDIRECT
) != 0)
939 if (h
->type
!= bfd_link_hash_new
)
941 struct bfd_link_hash_entry
*inh
;
943 h
->non_ir_ref
= TRUE
;
944 inh
= bfd_wrapped_link_hash_lookup (abfd
, info
, string
, FALSE
,
947 inh
->non_ir_ref
= TRUE
;
951 /* Nothing to do here for warning symbols. */
952 else if ((flags
& BSF_WARNING
) != 0)
955 /* Nothing to do here for constructor symbols. */
956 else if ((flags
& BSF_CONSTRUCTOR
) != 0)
959 /* If this is a ref, set non_ir_ref. */
960 else if (bfd_is_und_section (section
))
961 h
->non_ir_ref
= TRUE
;
963 /* Otherwise, it must be a new def. Ensure any symbol defined
964 in an IR dummy BFD takes on a new value from a real BFD.
965 Weak symbols are not normally overridden by a new weak
966 definition, and strong symbols will normally cause multiple
967 definition errors. Avoid this by making the symbol appear
969 else if (((h
->type
== bfd_link_hash_defweak
970 || h
->type
== bfd_link_hash_defined
)
971 && is_ir_dummy_bfd (sym_bfd
= h
->u
.def
.section
->owner
))
972 || (h
->type
== bfd_link_hash_common
973 && is_ir_dummy_bfd (sym_bfd
= h
->u
.c
.p
->section
->owner
)))
975 h
->type
= bfd_link_hash_undefweak
;
976 h
->u
.undef
.abfd
= sym_bfd
;
980 /* Continue with cref/nocrossref/trace-sym processing. */
983 || (info
->notice_hash
!= NULL
984 && bfd_hash_lookup (info
->notice_hash
, h
->root
.string
,
985 FALSE
, FALSE
) != NULL
))
986 return (*orig_callbacks
->notice
) (info
, h
,
987 abfd
, section
, value
, flags
, string
);