1 // gold.cc -- main linker functions
3 // Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
30 #include "libiberty.h"
34 #include "workqueue.h"
35 #include "dirsearch.h"
46 #include "incremental.h"
53 const char* program_name
;
56 process_incremental_input(Incremental_binary
*, unsigned int, Input_objects
*,
57 Symbol_table
*, Layout
*, Dirsearch
*, Mapfile
*,
58 Task_token
*, Task_token
*);
61 gold_exit(bool status
)
63 if (parameters
!= NULL
64 && parameters
->options_valid()
65 && parameters
->options().has_plugins())
66 parameters
->options().plugins()->cleanup();
67 if (!status
&& parameters
!= NULL
&& parameters
->options_valid())
68 unlink_if_ordinary(parameters
->options().output_file_name());
69 exit(status
? EXIT_SUCCESS
: EXIT_FAILURE
);
75 // We are out of memory, so try hard to print a reasonable message.
76 // Note that we don't try to translate this message, since the
77 // translation process itself will require memory.
79 // LEN only exists to avoid a pointless warning when write is
80 // declared with warn_use_result, as when compiling with
81 // -D_USE_FORTIFY on GNU/Linux. Casting to void does not appear to
82 // work, at least not with gcc 4.3.0.
84 ssize_t len
= write(2, program_name
, strlen(program_name
));
87 const char* const s
= ": out of memory\n";
88 len
= write(2, s
, strlen(s
));
93 // Handle an unreachable case.
96 do_gold_unreachable(const char* filename
, int lineno
, const char* function
)
98 fprintf(stderr
, _("%s: internal error in %s, at %s:%d\n"),
99 program_name
, function
, filename
, lineno
);
103 // This class arranges to run the functions done in the middle of the
104 // link. It is just a closure.
106 class Middle_runner
: public Task_function_runner
109 Middle_runner(const General_options
& options
,
110 const Input_objects
* input_objects
,
111 Symbol_table
* symtab
,
112 Layout
* layout
, Mapfile
* mapfile
)
113 : options_(options
), input_objects_(input_objects
), symtab_(symtab
),
114 layout_(layout
), mapfile_(mapfile
)
118 run(Workqueue
*, const Task
*);
121 const General_options
& options_
;
122 const Input_objects
* input_objects_
;
123 Symbol_table
* symtab_
;
129 Middle_runner::run(Workqueue
* workqueue
, const Task
* task
)
131 queue_middle_tasks(this->options_
, task
, this->input_objects_
, this->symtab_
,
132 this->layout_
, workqueue
, this->mapfile_
);
135 // This class arranges the tasks to process the relocs for garbage collection.
137 class Gc_runner
: public Task_function_runner
140 Gc_runner(const General_options
& options
,
141 const Input_objects
* input_objects
,
142 Symbol_table
* symtab
,
143 Layout
* layout
, Mapfile
* mapfile
)
144 : options_(options
), input_objects_(input_objects
), symtab_(symtab
),
145 layout_(layout
), mapfile_(mapfile
)
149 run(Workqueue
*, const Task
*);
152 const General_options
& options_
;
153 const Input_objects
* input_objects_
;
154 Symbol_table
* symtab_
;
160 Gc_runner::run(Workqueue
* workqueue
, const Task
* task
)
162 queue_middle_gc_tasks(this->options_
, task
, this->input_objects_
,
163 this->symtab_
, this->layout_
, workqueue
,
167 // Queue up the initial set of tasks for this link job.
170 queue_initial_tasks(const General_options
& options
,
171 Dirsearch
& search_path
,
172 const Command_line
& cmdline
,
173 Workqueue
* workqueue
, Input_objects
* input_objects
,
174 Symbol_table
* symtab
, Layout
* layout
, Mapfile
* mapfile
)
176 if (cmdline
.begin() == cmdline
.end())
178 if (options
.printed_version())
180 gold_fatal(_("no input files"));
183 int thread_count
= options
.thread_count_initial();
184 if (thread_count
== 0)
185 thread_count
= cmdline
.number_of_input_files();
186 workqueue
->set_thread_count(thread_count
);
188 // For incremental links, the base output file.
189 Incremental_binary
* ibase
= NULL
;
191 if (parameters
->incremental())
193 if (options
.relocatable())
194 gold_error(_("incremental linking is incompatible with -r"));
195 if (options
.emit_relocs())
196 gold_error(_("incremental linking is incompatible with --emit-relocs"));
197 if (options
.gc_sections())
198 gold_error(_("incremental linking is incompatible with --gc-sections"));
199 if (options
.icf_enabled())
200 gold_error(_("incremental linking is incompatible with --icf"));
201 if (options
.has_plugins())
202 gold_error(_("incremental linking is incompatible with --plugin"));
204 if (parameters
->incremental_update())
206 Output_file
* of
= new Output_file(options
.output_file_name());
207 if (of
->open_base_file(options
.incremental_base(), true))
209 ibase
= open_incremental_binary(of
);
211 && ibase
->check_inputs(cmdline
, layout
->incremental_inputs()))
212 ibase
->init_layout(layout
);
222 if (set_parameters_incremental_full())
223 gold_info(_("linking with --incremental-full"));
225 gold_fatal(_("restart link with --incremental-full"));
230 // Read the input files. We have to add the symbols to the symbol
231 // table in order. We do this by creating a separate blocker for
232 // each input file. We associate the blocker with the following
233 // input file, to give us a convenient place to delete it.
234 Task_token
* this_blocker
= NULL
;
237 // Normal link. Queue a Read_symbols task for each input file
238 // on the command line.
239 for (Command_line::const_iterator p
= cmdline
.begin();
243 Task_token
* next_blocker
= new Task_token(true);
244 next_blocker
->add_blocker();
245 workqueue
->queue(new Read_symbols(input_objects
, symtab
, layout
,
246 &search_path
, 0, mapfile
, &*p
, NULL
,
247 NULL
, this_blocker
, next_blocker
));
248 this_blocker
= next_blocker
;
253 // Incremental update link. Process the list of input files
254 // stored in the base file, and queue a task for each file:
255 // a Read_symbols task for a changed file, and an Add_symbols task
256 // for an unchanged file. We need to mark all the space used by
257 // unchanged files before we can start any tasks running.
258 unsigned int input_file_count
= ibase
->input_file_count();
259 std::vector
<Task
*> tasks
;
260 tasks
.reserve(input_file_count
);
261 for (unsigned int i
= 0; i
< input_file_count
; ++i
)
263 Task_token
* next_blocker
= new Task_token(true);
264 next_blocker
->add_blocker();
265 Task
* t
= process_incremental_input(ibase
, i
, input_objects
, symtab
,
266 layout
, &search_path
, mapfile
,
267 this_blocker
, next_blocker
);
269 this_blocker
= next_blocker
;
271 // Now we can queue the tasks.
272 for (unsigned int i
= 0; i
< tasks
.size(); i
++)
273 workqueue
->queue(tasks
[i
]);
276 if (options
.has_plugins())
278 Task_token
* next_blocker
= new Task_token(true);
279 next_blocker
->add_blocker();
280 workqueue
->queue(new Plugin_hook(options
, input_objects
, symtab
, layout
,
281 &search_path
, mapfile
, this_blocker
,
283 this_blocker
= next_blocker
;
286 if (options
.relocatable()
287 && (options
.gc_sections() || options
.icf_enabled()))
288 gold_error(_("cannot mix -r with --gc-sections or --icf"));
290 if (options
.gc_sections() || options
.icf_enabled())
292 workqueue
->queue(new Task_function(new Gc_runner(options
,
298 "Task_function Gc_runner"));
302 workqueue
->queue(new Task_function(new Middle_runner(options
,
308 "Task_function Middle_runner"));
312 // Process an incremental input file: if it is unchanged from the previous
313 // link, return a task to add its symbols from the base file's incremental
314 // info; if it has changed, return a normal Read_symbols task. We create a
315 // task for every input file, if only to report the file for rebuilding the
319 process_incremental_input(Incremental_binary
* ibase
,
320 unsigned int input_file_index
,
321 Input_objects
* input_objects
,
322 Symbol_table
* symtab
,
324 Dirsearch
* search_path
,
326 Task_token
* this_blocker
,
327 Task_token
* next_blocker
)
329 const Incremental_binary::Input_reader
* input_reader
=
330 ibase
->get_input_reader(input_file_index
);
331 Incremental_input_type input_type
= input_reader
->type();
333 // Get the input argument corresponding to this input file, matching on
334 // the argument serial number. If the input file cannot be matched
335 // to an existing input argument, synthesize a new one.
336 const Input_argument
* input_argument
=
337 ibase
->get_input_argument(input_file_index
);
338 if (input_argument
== NULL
)
340 Input_file_argument
file(input_reader
->filename(),
341 Input_file_argument::INPUT_FILE_TYPE_FILE
,
342 "", false, parameters
->options());
343 Input_argument
* arg
= new Input_argument(file
);
344 arg
->set_script_info(ibase
->get_script_info(input_file_index
));
345 input_argument
= arg
;
348 gold_debug(DEBUG_INCREMENTAL
, "Incremental object: %s, type %d",
349 input_reader
->filename(), input_type
);
351 if (input_type
== INCREMENTAL_INPUT_SCRIPT
)
353 // Incremental_binary::check_inputs should have cancelled the
354 // incremental update if the script has changed.
355 gold_assert(!ibase
->file_has_changed(input_file_index
));
356 return new Check_script(layout
, ibase
, input_file_index
, input_reader
,
357 this_blocker
, next_blocker
);
360 if (input_type
== INCREMENTAL_INPUT_ARCHIVE
)
362 Incremental_library
* lib
= ibase
->get_library(input_file_index
);
363 gold_assert(lib
!= NULL
);
364 if (lib
->filename() == "/group/"
365 || !ibase
->file_has_changed(input_file_index
))
367 // Queue a task to check that no references have been added to any
368 // of the library's unused symbols.
369 return new Check_library(symtab
, layout
, ibase
, input_file_index
,
370 input_reader
, this_blocker
, next_blocker
);
374 // Queue a Read_symbols task to process the archive normally.
375 return new Read_symbols(input_objects
, symtab
, layout
, search_path
,
376 0, mapfile
, input_argument
, NULL
, NULL
,
377 this_blocker
, next_blocker
);
381 if (input_type
== INCREMENTAL_INPUT_ARCHIVE_MEMBER
)
383 // For archive members, check the timestamp of the containing archive.
384 Incremental_library
* lib
= ibase
->get_library(input_file_index
);
385 gold_assert(lib
!= NULL
);
386 // Process members of a --start-lib/--end-lib group as normal objects.
387 if (lib
->filename() != "/group/")
389 if (ibase
->file_has_changed(lib
->input_file_index()))
391 return new Read_member(input_objects
, symtab
, layout
, mapfile
,
392 input_reader
, this_blocker
, next_blocker
);
396 // The previous contributions from this file will be kept.
397 // Mark the pieces of output sections contributed by this
399 ibase
->reserve_layout(input_file_index
);
400 Object
* obj
= make_sized_incremental_object(ibase
,
404 return new Add_symbols(input_objects
, symtab
, layout
,
405 search_path
, 0, mapfile
, input_argument
,
406 obj
, lib
, NULL
, this_blocker
,
412 // Normal object file or shared library. Check if the file has changed
413 // since the last incremental link.
414 if (ibase
->file_has_changed(input_file_index
))
416 return new Read_symbols(input_objects
, symtab
, layout
, search_path
, 0,
417 mapfile
, input_argument
, NULL
, NULL
,
418 this_blocker
, next_blocker
);
422 // The previous contributions from this file will be kept.
423 // Mark the pieces of output sections contributed by this object.
424 ibase
->reserve_layout(input_file_index
);
425 Object
* obj
= make_sized_incremental_object(ibase
,
429 return new Add_symbols(input_objects
, symtab
, layout
, search_path
, 0,
430 mapfile
, input_argument
, obj
, NULL
, NULL
,
431 this_blocker
, next_blocker
);
435 // Queue up a set of tasks to be done before queueing the middle set
436 // of tasks. This is only necessary when garbage collection
437 // (--gc-sections) of unused sections is desired. The relocs are read
438 // and processed here early to determine the garbage sections before the
439 // relocs can be scanned in later tasks.
442 queue_middle_gc_tasks(const General_options
& options
,
444 const Input_objects
* input_objects
,
445 Symbol_table
* symtab
,
447 Workqueue
* workqueue
,
450 // Read_relocs for all the objects must be done and processed to find
451 // unused sections before any scanning of the relocs can take place.
452 Task_token
* this_blocker
= NULL
;
453 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
454 p
!= input_objects
->relobj_end();
457 Task_token
* next_blocker
= new Task_token(true);
458 next_blocker
->add_blocker();
459 workqueue
->queue(new Read_relocs(symtab
, layout
, *p
, this_blocker
,
461 this_blocker
= next_blocker
;
464 // If we are given only archives in input, we have no regular
465 // objects and THIS_BLOCKER is NULL here. Create a dummy
466 // blocker here so that we can run the middle tasks immediately.
467 if (this_blocker
== NULL
)
469 gold_assert(input_objects
->number_of_relobjs() == 0);
470 this_blocker
= new Task_token(true);
473 workqueue
->queue(new Task_function(new Middle_runner(options
,
479 "Task_function Middle_runner"));
482 // Queue up the middle set of tasks. These are the tasks which run
483 // after all the input objects have been found and all the symbols
484 // have been read, but before we lay out the output file.
487 queue_middle_tasks(const General_options
& options
,
489 const Input_objects
* input_objects
,
490 Symbol_table
* symtab
,
492 Workqueue
* workqueue
,
495 // Add any symbols named with -u options to the symbol table.
496 symtab
->add_undefined_symbols_from_command_line(layout
);
498 // If garbage collection was chosen, relocs have been read and processed
499 // at this point by pre_middle_tasks. Layout can then be done for all
501 if (parameters
->options().gc_sections())
503 // Find the start symbol if any.
505 if (parameters
->options().entry())
506 start_sym
= symtab
->lookup(parameters
->options().entry());
508 start_sym
= symtab
->lookup("_start");
509 if (start_sym
!= NULL
)
512 unsigned int shndx
= start_sym
->shndx(&is_ordinary
);
515 symtab
->gc()->worklist().push(
516 Section_id(start_sym
->object(), shndx
));
519 // Symbols named with -u should not be considered garbage.
520 symtab
->gc_mark_undef_symbols(layout
);
521 gold_assert(symtab
->gc() != NULL
);
522 // Do a transitive closure on all references to determine the worklist.
523 symtab
->gc()->do_transitive_closure();
526 // If identical code folding (--icf) is chosen it makes sense to do it
527 // only after garbage collection (--gc-sections) as we do not want to
528 // be folding sections that will be garbage.
529 if (parameters
->options().icf_enabled())
531 symtab
->icf()->find_identical_sections(input_objects
, symtab
);
534 // Call Object::layout for the second time to determine the
535 // output_sections for all referenced input sections. When
536 // --gc-sections or --icf is turned on, Object::layout is
537 // called twice. It is called the first time when the
538 // symbols are added.
539 if (parameters
->options().gc_sections()
540 || parameters
->options().icf_enabled())
542 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
543 p
!= input_objects
->relobj_end();
546 Task_lock_obj
<Object
> tlo(task
, *p
);
547 (*p
)->layout(symtab
, layout
, NULL
);
551 // Layout deferred objects due to plugins.
552 if (parameters
->options().has_plugins())
554 Plugin_manager
* plugins
= parameters
->options().plugins();
555 gold_assert(plugins
!= NULL
);
556 plugins
->layout_deferred_objects();
559 if (parameters
->options().gc_sections()
560 || parameters
->options().icf_enabled())
562 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
563 p
!= input_objects
->relobj_end();
566 // Update the value of output_section stored in rd.
567 Read_relocs_data
* rd
= (*p
)->get_relocs_data();
568 for (Read_relocs_data::Relocs_list::iterator q
= rd
->relocs
.begin();
569 q
!= rd
->relocs
.end();
572 q
->output_section
= (*p
)->output_section(q
->data_shndx
);
573 q
->needs_special_offset_handling
=
574 (*p
)->is_output_section_offset_invalid(q
->data_shndx
);
579 // We have to support the case of not seeing any input objects, and
580 // generate an empty file. Existing builds depend on being able to
581 // pass an empty archive to the linker and get an empty object file
582 // out. In order to do this we need to use a default target.
583 if (input_objects
->number_of_input_objects() == 0
584 && layout
->incremental_base() == NULL
)
585 parameters_force_valid_target();
587 int thread_count
= options
.thread_count_middle();
588 if (thread_count
== 0)
589 thread_count
= std::max(2, input_objects
->number_of_input_objects());
590 workqueue
->set_thread_count(thread_count
);
592 // Now we have seen all the input files.
593 const bool doing_static_link
=
594 (!input_objects
->any_dynamic()
595 && !parameters
->options().output_is_position_independent());
596 set_parameters_doing_static_link(doing_static_link
);
597 if (!doing_static_link
&& options
.is_static())
599 // We print out just the first .so we see; there may be others.
600 gold_assert(input_objects
->dynobj_begin() != input_objects
->dynobj_end());
601 gold_error(_("cannot mix -static with dynamic object %s"),
602 (*input_objects
->dynobj_begin())->name().c_str());
604 if (!doing_static_link
&& parameters
->options().relocatable())
605 gold_fatal(_("cannot mix -r with dynamic object %s"),
606 (*input_objects
->dynobj_begin())->name().c_str());
607 if (!doing_static_link
608 && options
.oformat_enum() != General_options::OBJECT_FORMAT_ELF
)
609 gold_fatal(_("cannot use non-ELF output format with dynamic object %s"),
610 (*input_objects
->dynobj_begin())->name().c_str());
612 if (parameters
->options().relocatable())
614 Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
615 if (p
!= input_objects
->relobj_end())
617 bool uses_split_stack
= (*p
)->uses_split_stack();
618 for (++p
; p
!= input_objects
->relobj_end(); ++p
)
620 if ((*p
)->uses_split_stack() != uses_split_stack
)
621 gold_fatal(_("cannot mix split-stack '%s' and "
622 "non-split-stack '%s' when using -r"),
623 (*input_objects
->relobj_begin())->name().c_str(),
624 (*p
)->name().c_str());
629 // For incremental updates, record the existing GOT and PLT entries.
630 if (parameters
->incremental_update())
632 Incremental_binary
* ibase
= layout
->incremental_base();
633 ibase
->process_got_plt(symtab
, layout
);
636 if (is_debugging_enabled(DEBUG_SCRIPT
))
637 layout
->script_options()->print(stderr
);
639 // For each dynamic object, record whether we've seen all the
640 // dynamic objects that it depends upon.
641 input_objects
->check_dynamic_dependencies();
643 // See if any of the input definitions violate the One Definition Rule.
644 // TODO: if this is too slow, do this as a task, rather than inline.
645 symtab
->detect_odr_violations(task
, options
.output_file_name());
647 // Do the --no-undefined-version check.
648 if (!parameters
->options().undefined_version())
650 Script_options
* so
= layout
->script_options();
651 so
->version_script_info()->check_unmatched_names(symtab
);
654 // Create any automatic note sections.
655 layout
->create_notes();
657 // Create any output sections required by any linker script.
658 layout
->create_script_sections();
660 // Define some sections and symbols needed for a dynamic link. This
661 // handles some cases we want to see before we read the relocs.
662 layout
->create_initial_dynamic_sections(symtab
);
664 // Define symbols from any linker scripts.
665 layout
->define_script_symbols(symtab
);
667 // Attach sections to segments.
668 layout
->attach_sections_to_segments();
670 if (!parameters
->options().relocatable())
672 // Predefine standard symbols.
673 define_standard_symbols(symtab
, layout
);
675 // Define __start and __stop symbols for output sections where
677 layout
->define_section_symbols(symtab
);
680 // Make sure we have symbols for any required group signatures.
681 layout
->define_group_signatures(symtab
);
683 Task_token
* this_blocker
= NULL
;
685 // Allocate common symbols. We use a blocker to run this before the
686 // Scan_relocs tasks, because it writes to the symbol table just as
688 if (parameters
->options().define_common())
690 this_blocker
= new Task_token(true);
691 this_blocker
->add_blocker();
692 workqueue
->queue(new Allocate_commons_task(symtab
, layout
, mapfile
,
696 // If doing garbage collection, the relocations have already been read.
697 // Otherwise, read and scan the relocations.
698 if (parameters
->options().gc_sections()
699 || parameters
->options().icf_enabled())
701 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
702 p
!= input_objects
->relobj_end();
705 Task_token
* next_blocker
= new Task_token(true);
706 next_blocker
->add_blocker();
707 workqueue
->queue(new Scan_relocs(symtab
, layout
, *p
,
708 (*p
)->get_relocs_data(),
709 this_blocker
, next_blocker
));
710 this_blocker
= next_blocker
;
715 // Read the relocations of the input files. We do this to find
716 // which symbols are used by relocations which require a GOT and/or
717 // a PLT entry, or a COPY reloc. When we implement garbage
718 // collection we will do it here by reading the relocations in a
719 // breadth first search by references.
721 // We could also read the relocations during the first pass, and
722 // mark symbols at that time. That is how the old GNU linker works.
723 // Doing that is more complex, since we may later decide to discard
724 // some of the sections, and thus change our minds about the types
725 // of references made to the symbols.
726 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
727 p
!= input_objects
->relobj_end();
730 Task_token
* next_blocker
= new Task_token(true);
731 next_blocker
->add_blocker();
732 workqueue
->queue(new Read_relocs(symtab
, layout
, *p
, this_blocker
,
734 this_blocker
= next_blocker
;
738 if (this_blocker
== NULL
)
740 if (input_objects
->number_of_relobjs() == 0)
742 // If we are given only archives in input, we have no regular
743 // objects and THIS_BLOCKER is NULL here. Create a dummy
744 // blocker here so that we can run the layout task immediately.
745 this_blocker
= new Task_token(true);
749 // If we failed to open any input files, it's possible for
750 // THIS_BLOCKER to be NULL here. There's no real point in
751 // continuing if that happens.
752 gold_assert(parameters
->errors()->error_count() > 0);
757 // When all those tasks are complete, we can start laying out the
759 // TODO(csilvers): figure out a more principled way to get the target
760 Target
* target
= const_cast<Target
*>(¶meters
->target());
761 workqueue
->queue(new Task_function(new Layout_task_runner(options
,
768 "Task_function Layout_task_runner"));
771 // Queue up the final set of tasks. This is called at the end of
775 queue_final_tasks(const General_options
& options
,
776 const Input_objects
* input_objects
,
777 const Symbol_table
* symtab
,
779 Workqueue
* workqueue
,
782 int thread_count
= options
.thread_count_final();
783 if (thread_count
== 0)
784 thread_count
= std::max(2, input_objects
->number_of_input_objects());
785 workqueue
->set_thread_count(thread_count
);
787 bool any_postprocessing_sections
= layout
->any_postprocessing_sections();
789 // Use a blocker to wait until all the input sections have been
791 Task_token
* input_sections_blocker
= NULL
;
792 if (!any_postprocessing_sections
)
794 input_sections_blocker
= new Task_token(true);
795 input_sections_blocker
->add_blockers(input_objects
->number_of_relobjs());
798 // Use a blocker to block any objects which have to wait for the
799 // output sections to complete before they can apply relocations.
800 Task_token
* output_sections_blocker
= new Task_token(true);
801 output_sections_blocker
->add_blocker();
803 // Use a blocker to block the final cleanup task.
804 Task_token
* final_blocker
= new Task_token(true);
805 // Write_symbols_task, Write_sections_task, Write_data_task,
807 final_blocker
->add_blockers(3);
808 final_blocker
->add_blockers(input_objects
->number_of_relobjs());
809 if (!any_postprocessing_sections
)
810 final_blocker
->add_blocker();
812 // Queue a task to write out the symbol table.
813 workqueue
->queue(new Write_symbols_task(layout
,
821 // Queue a task to write out the output sections.
822 workqueue
->queue(new Write_sections_task(layout
, of
, output_sections_blocker
,
825 // Queue a task to write out everything else.
826 workqueue
->queue(new Write_data_task(layout
, symtab
, of
, final_blocker
));
828 // Queue a task for each input object to relocate the sections and
829 // write out the local symbols.
830 for (Input_objects::Relobj_iterator p
= input_objects
->relobj_begin();
831 p
!= input_objects
->relobj_end();
833 workqueue
->queue(new Relocate_task(symtab
, layout
, *p
, of
,
834 input_sections_blocker
,
835 output_sections_blocker
,
838 // Queue a task to write out the output sections which depend on
839 // input sections. If there are any sections which require
840 // postprocessing, then we need to do this last, since it may resize
842 if (!any_postprocessing_sections
)
844 Task
* t
= new Write_after_input_sections_task(layout
, of
,
845 input_sections_blocker
,
851 Task_token
* new_final_blocker
= new Task_token(true);
852 new_final_blocker
->add_blocker();
853 Task
* t
= new Write_after_input_sections_task(layout
, of
,
857 final_blocker
= new_final_blocker
;
860 // Queue a task to close the output file. This will be blocked by
862 workqueue
->queue(new Task_function(new Close_task_runner(&options
, layout
,
865 "Task_function Close_task_runner"));
868 } // End namespace gold.