1 // readsyms.cc -- read input file symbols for gold
3 // Copyright 2006, 2007, 2008, 2009 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.
29 #include "dirsearch.h"
37 #include "incremental.h"
42 // If we fail to open the object, then we won't create an Add_symbols
43 // task. However, we still need to unblock the token, or else the
44 // link won't proceed to generate more error messages. We can only
45 // unblock tokens when the workqueue lock is held, so we need a dummy
46 // task to do that. The dummy task has to maintain the right sequence
47 // of blocks, so we need both this_blocker and next_blocker.
49 class Unblock_token
: public Task
52 Unblock_token(Task_token
* this_blocker
, Task_token
* next_blocker
)
53 : this_blocker_(this_blocker
), next_blocker_(next_blocker
)
58 if (this->this_blocker_
!= NULL
)
59 delete this->this_blocker_
;
65 if (this->this_blocker_
!= NULL
&& this->this_blocker_
->is_blocked())
66 return this->this_blocker_
;
71 locks(Task_locker
* tl
)
72 { tl
->add(this, this->next_blocker_
); }
80 { return "Unblock_token"; }
83 Task_token
* this_blocker_
;
84 Task_token
* next_blocker_
;
87 // Class read_symbols.
89 Read_symbols::~Read_symbols()
91 // The this_blocker_ and next_blocker_ pointers are passed on to the
95 // If appropriate, issue a warning about skipping an incompatible
99 Read_symbols::incompatible_warning(const Input_argument
* input_argument
,
100 const Input_file
* input_file
)
102 if (parameters
->options().warn_search_mismatch())
103 gold_warning("skipping incompatible %s while searching for %s",
104 input_file
->filename().c_str(),
105 input_argument
->file().name());
108 // Requeue a Read_symbols task to search for the next object with the
112 Read_symbols::requeue(Workqueue
* workqueue
, Input_objects
* input_objects
,
113 Symbol_table
* symtab
, Layout
* layout
, Dirsearch
* dirpath
,
114 int dirindex
, Mapfile
* mapfile
,
115 const Input_argument
* input_argument
,
116 Input_group
* input_group
, Task_token
* next_blocker
)
118 // Bump the directory search index.
121 // We don't need to worry about this_blocker, since we already
122 // reached it. However, we are removing the blocker on next_blocker
123 // because the calling task is completing. So we need to add a new
124 // blocker. Since next_blocker may be shared by several tasks, we
125 // need to increment the count with the workqueue lock held.
126 workqueue
->add_blocker(next_blocker
);
128 workqueue
->queue(new Read_symbols(input_objects
, symtab
, layout
, dirpath
,
129 dirindex
, mapfile
, input_argument
,
130 input_group
, NULL
, next_blocker
));
133 // Return whether a Read_symbols task is runnable. We can read an
134 // ordinary input file immediately. For an archive specified using
135 // -l, we have to wait until the search path is complete.
138 Read_symbols::is_runnable()
140 if (this->input_argument_
->is_file()
141 && this->input_argument_
->file().may_need_search()
142 && this->dirpath_
->token()->is_blocked())
143 return this->dirpath_
->token();
148 // Return a Task_locker for a Read_symbols task. We don't need any
152 Read_symbols::locks(Task_locker
*)
156 // Run a Read_symbols task.
159 Read_symbols::run(Workqueue
* workqueue
)
161 // If we didn't queue a new task, then we need to explicitly unblock
163 if (!this->do_read_symbols(workqueue
))
164 workqueue
->queue_soon(new Unblock_token(this->this_blocker_
,
165 this->next_blocker_
));
168 // Open the file and read the symbols. Return true if a new task was
169 // queued, false if that could not happen due to some error.
172 Read_symbols::do_read_symbols(Workqueue
* workqueue
)
174 if (this->input_argument_
->is_group())
176 gold_assert(this->input_group_
== NULL
);
177 this->do_group(workqueue
);
181 Input_file
* input_file
= new Input_file(&this->input_argument_
->file());
182 if (!input_file
->open(*this->dirpath_
, this, &this->dirindex_
))
185 // Read enough of the file to pick up the entire ELF header.
187 off_t filesize
= input_file
->file().filesize();
191 gold_error(_("%s: file is empty"),
192 input_file
->file().filename().c_str());
196 const unsigned char* ehdr
;
198 bool is_elf
= is_elf_object(input_file
, 0, &ehdr
, &read_size
);
200 if (read_size
>= Archive::sarmag
)
203 = memcmp(ehdr
, Archive::armagt
, Archive::sarmag
) == 0;
205 || memcmp(ehdr
, Archive::armag
, Archive::sarmag
) == 0)
207 // This is an archive.
208 Archive
* arch
= new Archive(this->input_argument_
->file().name(),
209 input_file
, is_thin_archive
,
210 this->dirpath_
, this);
213 if (this->layout_
->incremental_inputs())
215 const Input_argument
* ia
= this->input_argument_
;
216 this->layout_
->incremental_inputs()->report_archive(ia
, arch
);
219 // Unlock the archive so it can be used in the next task.
222 workqueue
->queue_next(new Add_archive_symbols(this->symtab_
,
224 this->input_objects_
,
228 this->input_argument_
,
232 this->next_blocker_
));
237 if (parameters
->options().has_plugins())
239 Pluginobj
* obj
= parameters
->options().plugins()->claim_file(input_file
,
243 // The input file was claimed by a plugin, and its symbols
244 // have been provided by the plugin.
246 // We are done with the file at this point, so unlock it.
249 workqueue
->queue_next(new Add_symbols(this->input_objects_
,
255 this->input_argument_
,
260 this->next_blocker_
));
267 // This is an ELF object.
270 Object
* obj
= make_elf_object(input_file
->filename(),
271 input_file
, 0, ehdr
, read_size
,
275 if (unconfigured
&& input_file
->will_search_for())
277 Read_symbols::incompatible_warning(this->input_argument_
,
279 input_file
->file().release();
280 input_file
->file().unlock(this);
283 return this->do_read_symbols(workqueue
);
288 Read_symbols_data
* sd
= new Read_symbols_data
;
289 obj
->read_symbols(sd
);
291 if (this->layout_
->incremental_inputs())
293 const Input_argument
* ia
= this->input_argument_
;
294 this->layout_
->incremental_inputs()->report_object(ia
, obj
);
297 // Opening the file locked it, so now we need to unlock it. We
298 // need to unlock it before queuing the Add_symbols task,
299 // because the workqueue doesn't know about our lock on the
300 // file. If we queue the Add_symbols task first, it will be
301 // stuck on the end of the file lock, but since the workqueue
302 // doesn't know about that lock, it will never release the
305 input_file
->file().unlock(this);
307 // We use queue_next because everything is cached for this
308 // task to run right away if possible.
310 workqueue
->queue_next(new Add_symbols(this->input_objects_
,
311 this->symtab_
, this->layout_
,
315 this->input_argument_
,
320 this->next_blocker_
));
325 // Queue up a task to try to parse this file as a script. We use a
326 // separate task so that the script will be read in order with other
327 // objects named on the command line. Also so that we don't try to
328 // read multiple scripts simultaneously, which could lead to
329 // unpredictable changes to the General_options structure.
331 workqueue
->queue_soon(new Read_script(this->symtab_
,
335 this->input_objects_
,
338 this->input_argument_
,
341 this->next_blocker_
));
345 // Handle a group. We need to walk through the arguments over and
346 // over until we don't see any new undefined symbols. We do this by
347 // setting off Read_symbols Tasks as usual, but recording the archive
348 // entries instead of deleting them. We also start a Finish_group
349 // Task which runs after we've read all the symbols. In that task we
350 // process the archives in a loop until we are done.
353 Read_symbols::do_group(Workqueue
* workqueue
)
355 Input_group
* input_group
= new Input_group();
357 const Input_file_group
* group
= this->input_argument_
->group();
358 Task_token
* this_blocker
= this->this_blocker_
;
360 for (Input_file_group::const_iterator p
= group
->begin();
364 const Input_argument
* arg
= &*p
;
365 gold_assert(arg
->is_file());
367 Task_token
* next_blocker
= new Task_token(true);
368 next_blocker
->add_blocker();
369 workqueue
->queue_soon(new Read_symbols(this->input_objects_
,
370 this->symtab_
, this->layout_
,
371 this->dirpath_
, this->dirindex_
,
372 this->mapfile_
, arg
, input_group
,
373 this_blocker
, next_blocker
));
374 this_blocker
= next_blocker
;
377 const int saw_undefined
= this->symtab_
->saw_undefined();
378 workqueue
->queue_soon(new Finish_group(this->input_objects_
,
385 this->next_blocker_
));
388 // Return a debugging name for a Read_symbols task.
391 Read_symbols::get_name() const
393 if (!this->input_argument_
->is_group())
395 std::string
ret("Read_symbols ");
396 if (this->input_argument_
->file().is_lib())
398 ret
+= this->input_argument_
->file().name();
402 std::string
ret("Read_symbols group (");
403 bool add_space
= false;
404 const Input_file_group
* group
= this->input_argument_
->group();
405 for (Input_file_group::const_iterator p
= group
->begin();
411 ret
+= p
->file().name();
417 // Class Add_symbols.
419 Add_symbols::~Add_symbols()
421 if (this->this_blocker_
!= NULL
)
422 delete this->this_blocker_
;
423 // next_blocker_ is deleted by the task associated with the next
427 // We are blocked by this_blocker_. We block next_blocker_. We also
431 Add_symbols::is_runnable()
433 if (this->this_blocker_
!= NULL
&& this->this_blocker_
->is_blocked())
434 return this->this_blocker_
;
435 if (this->object_
->is_locked())
436 return this->object_
->token();
441 Add_symbols::locks(Task_locker
* tl
)
443 tl
->add(this, this->next_blocker_
);
444 tl
->add(this, this->object_
->token());
447 // Add the symbols in the object to the symbol table.
450 Add_symbols::run(Workqueue
* workqueue
)
452 Pluginobj
* pluginobj
= this->object_
->pluginobj();
453 if (pluginobj
!= NULL
)
455 this->object_
->add_symbols(this->symtab_
, this->sd_
, this->layout_
);
459 // If this file has an incompatible format, try for another file
460 // with the same name.
461 if (this->object_
->searched_for()
462 && !parameters
->is_compatible_target(this->object_
->target()))
464 Read_symbols::incompatible_warning(this->input_argument_
,
465 this->object_
->input_file());
466 Read_symbols::requeue(workqueue
, this->input_objects_
, this->symtab_
,
467 this->layout_
, this->dirpath_
, this->dirindex_
,
468 this->mapfile_
, this->input_argument_
,
469 this->input_group_
, this->next_blocker_
);
470 this->object_
->release();
471 delete this->object_
;
473 else if (!this->input_objects_
->add_object(this->object_
))
475 this->object_
->release();
476 delete this->object_
;
480 this->object_
->layout(this->symtab_
, this->layout_
, this->sd_
);
481 this->object_
->add_symbols(this->symtab_
, this->sd_
, this->layout_
);
482 this->object_
->release();
488 // Class Finish_group.
490 Finish_group::~Finish_group()
492 if (this->this_blocker_
!= NULL
)
493 delete this->this_blocker_
;
494 // next_blocker_ is deleted by the task associated with the next
495 // input file following the group.
498 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
501 Finish_group::is_runnable()
503 if (this->this_blocker_
!= NULL
&& this->this_blocker_
->is_blocked())
504 return this->this_blocker_
;
509 Finish_group::locks(Task_locker
* tl
)
511 tl
->add(this, this->next_blocker_
);
514 // Loop over the archives until there are no new undefined symbols.
517 Finish_group::run(Workqueue
*)
519 int saw_undefined
= this->saw_undefined_
;
520 while (saw_undefined
!= this->symtab_
->saw_undefined())
522 saw_undefined
= this->symtab_
->saw_undefined();
524 for (Input_group::const_iterator p
= this->input_group_
->begin();
525 p
!= this->input_group_
->end();
528 Task_lock_obj
<Archive
> tl(this, *p
);
530 (*p
)->add_symbols(this->symtab_
, this->layout_
,
531 this->input_objects_
, this->mapfile_
);
535 // Delete all the archives now that we no longer need them.
536 for (Input_group::const_iterator p
= this->input_group_
->begin();
537 p
!= this->input_group_
->end();
540 delete this->input_group_
;
545 Read_script::~Read_script()
547 if (this->this_blocker_
!= NULL
)
548 delete this->this_blocker_
;
549 // next_blocker_ is deleted by the task associated with the next
553 // We are blocked by this_blocker_.
556 Read_script::is_runnable()
558 if (this->this_blocker_
!= NULL
&& this->this_blocker_
->is_blocked())
559 return this->this_blocker_
;
563 // We don't unlock next_blocker_ here. If the script names any input
564 // files, then the last file will be responsible for unlocking it.
567 Read_script::locks(Task_locker
*)
571 // Read the script, if it is a script.
574 Read_script::run(Workqueue
* workqueue
)
576 bool used_next_blocker
;
577 if (!read_input_script(workqueue
, this->symtab_
, this->layout_
,
578 this->dirpath_
, this->dirindex_
, this->input_objects_
,
579 this->mapfile_
, this->input_group_
,
580 this->input_argument_
, this->input_file_
,
581 this->next_blocker_
, &used_next_blocker
))
583 // Here we have to handle any other input file types we need.
584 gold_error(_("%s: not an object or archive"),
585 this->input_file_
->file().filename().c_str());
588 if (!used_next_blocker
)
590 // Queue up a task to unlock next_blocker. We can't just unlock
591 // it here, as we don't hold the workqueue lock.
592 workqueue
->queue_soon(new Unblock_token(NULL
, this->next_blocker_
));
596 // Return a debugging name for a Read_script task.
599 Read_script::get_name() const
601 std::string
ret("Read_script ");
602 if (this->input_argument_
->file().is_lib())
604 ret
+= this->input_argument_
->file().name();
608 } // End namespace gold.
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