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.
269 bool unconfigured
= false;
270 bool* punconfigured
= (input_file
->will_search_for()
273 Object
* obj
= make_elf_object(input_file
->filename(),
274 input_file
, 0, ehdr
, read_size
,
280 Read_symbols::incompatible_warning(this->input_argument_
,
282 input_file
->file().release();
283 input_file
->file().unlock(this);
286 return this->do_read_symbols(workqueue
);
291 Read_symbols_data
* sd
= new Read_symbols_data
;
292 obj
->read_symbols(sd
);
294 if (this->layout_
->incremental_inputs())
296 const Input_argument
* ia
= this->input_argument_
;
297 this->layout_
->incremental_inputs()->report_object(ia
, obj
);
300 // Opening the file locked it, so now we need to unlock it. We
301 // need to unlock it before queuing the Add_symbols task,
302 // because the workqueue doesn't know about our lock on the
303 // file. If we queue the Add_symbols task first, it will be
304 // stuck on the end of the file lock, but since the workqueue
305 // doesn't know about that lock, it will never release the
308 input_file
->file().unlock(this);
310 // We use queue_next because everything is cached for this
311 // task to run right away if possible.
313 workqueue
->queue_next(new Add_symbols(this->input_objects_
,
314 this->symtab_
, this->layout_
,
318 this->input_argument_
,
323 this->next_blocker_
));
328 // Queue up a task to try to parse this file as a script. We use a
329 // separate task so that the script will be read in order with other
330 // objects named on the command line. Also so that we don't try to
331 // read multiple scripts simultaneously, which could lead to
332 // unpredictable changes to the General_options structure.
334 workqueue
->queue_soon(new Read_script(this->symtab_
,
338 this->input_objects_
,
341 this->input_argument_
,
344 this->next_blocker_
));
348 // Handle a group. We need to walk through the arguments over and
349 // over until we don't see any new undefined symbols. We do this by
350 // setting off Read_symbols Tasks as usual, but recording the archive
351 // entries instead of deleting them. We also start a Finish_group
352 // Task which runs after we've read all the symbols. In that task we
353 // process the archives in a loop until we are done.
356 Read_symbols::do_group(Workqueue
* workqueue
)
358 Input_group
* input_group
= new Input_group();
360 const Input_file_group
* group
= this->input_argument_
->group();
361 Task_token
* this_blocker
= this->this_blocker_
;
363 for (Input_file_group::const_iterator p
= group
->begin();
367 const Input_argument
* arg
= &*p
;
368 gold_assert(arg
->is_file());
370 Task_token
* next_blocker
= new Task_token(true);
371 next_blocker
->add_blocker();
372 workqueue
->queue_soon(new Read_symbols(this->input_objects_
,
373 this->symtab_
, this->layout_
,
374 this->dirpath_
, this->dirindex_
,
375 this->mapfile_
, arg
, input_group
,
376 this_blocker
, next_blocker
));
377 this_blocker
= next_blocker
;
380 const int saw_undefined
= this->symtab_
->saw_undefined();
381 workqueue
->queue_soon(new Finish_group(this->input_objects_
,
388 this->next_blocker_
));
391 // Return a debugging name for a Read_symbols task.
394 Read_symbols::get_name() const
396 if (!this->input_argument_
->is_group())
398 std::string
ret("Read_symbols ");
399 if (this->input_argument_
->file().is_lib())
401 else if (this->input_argument_
->file().is_searched_file())
403 ret
+= this->input_argument_
->file().name();
407 std::string
ret("Read_symbols group (");
408 bool add_space
= false;
409 const Input_file_group
* group
= this->input_argument_
->group();
410 for (Input_file_group::const_iterator p
= group
->begin();
416 ret
+= p
->file().name();
422 // Class Add_symbols.
424 Add_symbols::~Add_symbols()
426 if (this->this_blocker_
!= NULL
)
427 delete this->this_blocker_
;
428 // next_blocker_ is deleted by the task associated with the next
432 // We are blocked by this_blocker_. We block next_blocker_. We also
436 Add_symbols::is_runnable()
438 if (this->this_blocker_
!= NULL
&& this->this_blocker_
->is_blocked())
439 return this->this_blocker_
;
440 if (this->object_
->is_locked())
441 return this->object_
->token();
446 Add_symbols::locks(Task_locker
* tl
)
448 tl
->add(this, this->next_blocker_
);
449 tl
->add(this, this->object_
->token());
452 // Add the symbols in the object to the symbol table.
455 Add_symbols::run(Workqueue
*)
457 Pluginobj
* pluginobj
= this->object_
->pluginobj();
458 if (pluginobj
!= NULL
)
460 this->object_
->add_symbols(this->symtab_
, this->sd_
, this->layout_
);
464 if (!this->input_objects_
->add_object(this->object_
))
466 this->object_
->release();
467 delete this->object_
;
471 this->object_
->layout(this->symtab_
, this->layout_
, this->sd_
);
472 this->object_
->add_symbols(this->symtab_
, this->sd_
, this->layout_
);
473 this->object_
->release();
479 // Class Finish_group.
481 Finish_group::~Finish_group()
483 if (this->this_blocker_
!= NULL
)
484 delete this->this_blocker_
;
485 // next_blocker_ is deleted by the task associated with the next
486 // input file following the group.
489 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
492 Finish_group::is_runnable()
494 if (this->this_blocker_
!= NULL
&& this->this_blocker_
->is_blocked())
495 return this->this_blocker_
;
500 Finish_group::locks(Task_locker
* tl
)
502 tl
->add(this, this->next_blocker_
);
505 // Loop over the archives until there are no new undefined symbols.
508 Finish_group::run(Workqueue
*)
510 int saw_undefined
= this->saw_undefined_
;
511 while (saw_undefined
!= this->symtab_
->saw_undefined())
513 saw_undefined
= this->symtab_
->saw_undefined();
515 for (Input_group::const_iterator p
= this->input_group_
->begin();
516 p
!= this->input_group_
->end();
519 Task_lock_obj
<Archive
> tl(this, *p
);
521 (*p
)->add_symbols(this->symtab_
, this->layout_
,
522 this->input_objects_
, this->mapfile_
);
526 // Delete all the archives now that we no longer need them.
527 for (Input_group::const_iterator p
= this->input_group_
->begin();
528 p
!= this->input_group_
->end();
531 delete this->input_group_
;
536 Read_script::~Read_script()
538 if (this->this_blocker_
!= NULL
)
539 delete this->this_blocker_
;
540 // next_blocker_ is deleted by the task associated with the next
544 // We are blocked by this_blocker_.
547 Read_script::is_runnable()
549 if (this->this_blocker_
!= NULL
&& this->this_blocker_
->is_blocked())
550 return this->this_blocker_
;
554 // We don't unlock next_blocker_ here. If the script names any input
555 // files, then the last file will be responsible for unlocking it.
558 Read_script::locks(Task_locker
*)
562 // Read the script, if it is a script.
565 Read_script::run(Workqueue
* workqueue
)
567 bool used_next_blocker
;
568 if (!read_input_script(workqueue
, this->symtab_
, this->layout_
,
569 this->dirpath_
, this->dirindex_
, this->input_objects_
,
570 this->mapfile_
, this->input_group_
,
571 this->input_argument_
, this->input_file_
,
572 this->next_blocker_
, &used_next_blocker
))
574 // Here we have to handle any other input file types we need.
575 gold_error(_("%s: not an object or archive"),
576 this->input_file_
->file().filename().c_str());
579 if (!used_next_blocker
)
581 // Queue up a task to unlock next_blocker. We can't just unlock
582 // it here, as we don't hold the workqueue lock.
583 workqueue
->queue_soon(new Unblock_token(NULL
, this->next_blocker_
));
587 // Return a debugging name for a Read_script task.
590 Read_script::get_name() const
592 std::string
ret("Read_script ");
593 if (this->input_argument_
->file().is_lib())
595 else if (this->input_argument_
->file().is_searched_file())
597 ret
+= this->input_argument_
->file().name();
601 } // End namespace gold.
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