1 // readsyms.cc -- read input file symbols for gold
2 
3 // Copyright (C) 2006-2016 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
5 
6 // This file is part of gold.
7 
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.
12 
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.
17 
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.
22 
23 #include "gold.h"
24 
25 #include <cstring>
26 
27 #include "elfcpp.h"
28 #include "options.h"
29 #include "dirsearch.h"
30 #include "symtab.h"
31 #include "object.h"
32 #include "archive.h"
33 #include "script.h"
34 #include "readsyms.h"
35 #include "plugin.h"
36 #include "layout.h"
37 #include "incremental.h"
38 
39 namespace gold
40 {
41 
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.
48 
49 class Unblock_token : public Task
50 {
51  public:
Unblock_token(Task_token * this_blocker,Task_token * next_blocker)52   Unblock_token(Task_token* this_blocker, Task_token* next_blocker)
53     : this_blocker_(this_blocker), next_blocker_(next_blocker)
54   { }
55 
~Unblock_token()56   ~Unblock_token()
57   {
58     if (this->this_blocker_ != NULL)
59       delete this->this_blocker_;
60   }
61 
62   Task_token*
is_runnable()63   is_runnable()
64   {
65     if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
66       return this->this_blocker_;
67     return NULL;
68   }
69 
70   void
locks(Task_locker * tl)71   locks(Task_locker* tl)
72   { tl->add(this, this->next_blocker_); }
73 
74   void
run(Workqueue *)75   run(Workqueue*)
76   { }
77 
78   std::string
get_name() const79   get_name() const
80   { return "Unblock_token"; }
81 
82  private:
83   Task_token* this_blocker_;
84   Task_token* next_blocker_;
85 };
86 
87 // Class read_symbols.
88 
~Read_symbols()89 Read_symbols::~Read_symbols()
90 {
91   // The this_blocker_ and next_blocker_ pointers are passed on to the
92   // Add_symbols task.
93 }
94 
95 // If appropriate, issue a warning about skipping an incompatible
96 // file.
97 
98 void
incompatible_warning(const Input_argument * input_argument,const Input_file * input_file)99 Read_symbols::incompatible_warning(const Input_argument* input_argument,
100 				   const Input_file* input_file)
101 {
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());
106 }
107 
108 // Requeue a Read_symbols task to search for the next object with the
109 // same name.
110 
111 void
requeue(Workqueue * workqueue,Input_objects * input_objects,Symbol_table * symtab,Layout * layout,Dirsearch * dirpath,int dirindex,Mapfile * mapfile,const Input_argument * input_argument,Input_group * input_group,Task_token * next_blocker)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)
117 {
118   // Bump the directory search index.
119   ++dirindex;
120 
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);
127 
128   workqueue->queue(new Read_symbols(input_objects, symtab, layout, dirpath,
129 				    dirindex, mapfile, input_argument,
130 				    input_group, NULL, NULL, next_blocker));
131 }
132 
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.
136 
137 Task_token*
is_runnable()138 Read_symbols::is_runnable()
139 {
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();
144 
145   return NULL;
146 }
147 
148 // Return a Task_locker for a Read_symbols task.  We don't need any
149 // locks here.
150 
151 void
locks(Task_locker * tl)152 Read_symbols::locks(Task_locker* tl)
153 {
154   if (this->member_ != NULL)
155     tl->add(this, this->next_blocker_);
156 }
157 
158 // Run a Read_symbols task.
159 
160 void
run(Workqueue * workqueue)161 Read_symbols::run(Workqueue* workqueue)
162 {
163   // If we didn't queue a new task, then we need to explicitly unblock
164   // the token. If the object is a member of a lib group, however,
165   // the token was already added to the list of locks for the task,
166   // and it will be unblocked automatically at the end of the task.
167   if (!this->do_read_symbols(workqueue) && this->member_ == NULL)
168     workqueue->queue_soon(new Unblock_token(this->this_blocker_,
169 					    this->next_blocker_));
170 }
171 
172 // Handle a whole lib group. Other than collecting statistics, this just
173 // mimics what we do for regular object files in the command line.
174 
175 bool
do_whole_lib_group(Workqueue * workqueue)176 Read_symbols::do_whole_lib_group(Workqueue* workqueue)
177 {
178   const Input_file_lib* lib_group = this->input_argument_->lib();
179 
180   ++Lib_group::total_lib_groups;
181 
182   Task_token* this_blocker = this->this_blocker_;
183   for (Input_file_lib::const_iterator i = lib_group->begin();
184        i != lib_group->end();
185        ++i)
186     {
187       ++Lib_group::total_members;
188       ++Lib_group::total_members_loaded;
189 
190       const Input_argument* arg = &*i;
191 
192       Task_token* next_blocker;
193       if (i != lib_group->end() - 1)
194         {
195           next_blocker = new Task_token(true);
196           next_blocker->add_blocker();
197         }
198       else
199         next_blocker = this->next_blocker_;
200 
201       workqueue->queue_soon(new Read_symbols(this->input_objects_,
202 					     this->symtab_, this->layout_,
203 					     this->dirpath_, this->dirindex_,
204 					     this->mapfile_, arg, NULL,
205 					     NULL, this_blocker, next_blocker));
206       this_blocker = next_blocker;
207     }
208 
209   return true;
210 }
211 
212 // Handle a lib group. We set Read_symbols Tasks as usual, but have them
213 // just record the symbol data instead of adding the objects.  We also start
214 // a Add_lib_group_symbols Task which runs after we've read all the symbols.
215 // In that task we process the members in a loop until we are done.
216 
217 bool
do_lib_group(Workqueue * workqueue)218 Read_symbols::do_lib_group(Workqueue* workqueue)
219 {
220   const Input_file_lib* lib_group = this->input_argument_->lib();
221 
222   if (lib_group->options().whole_archive())
223     return this->do_whole_lib_group(workqueue);
224 
225   Lib_group* lib = new Lib_group(lib_group, this);
226 
227   Add_lib_group_symbols* add_lib_group_symbols =
228     new Add_lib_group_symbols(this->symtab_, this->layout_,
229 			      this->input_objects_,
230 			      lib, this->next_blocker_);
231 
232 
233   Task_token* next_blocker = new Task_token(true);
234   int j = 0;
235   for (Input_file_lib::const_iterator i = lib_group->begin();
236        i != lib_group->end();
237        ++i, ++j)
238     {
239       const Input_argument* arg = &*i;
240       Archive_member* m = lib->get_member(j);
241 
242       next_blocker->add_blocker();
243 
244       // Since this Read_symbols will not create an Add_symbols,
245       // just pass NULL as this_blocker.
246       workqueue->queue_soon(new Read_symbols(this->input_objects_,
247 					     this->symtab_, this->layout_,
248 					     this->dirpath_, this->dirindex_,
249 					     this->mapfile_, arg, NULL,
250 					     m, NULL, next_blocker));
251     }
252 
253   add_lib_group_symbols->set_blocker(next_blocker, this->this_blocker_);
254   workqueue->queue_soon(add_lib_group_symbols);
255 
256   return true;
257 }
258 
259 // Open the file and read the symbols.  Return true if a new task was
260 // queued, false if that could not happen due to some error.
261 
262 bool
do_read_symbols(Workqueue * workqueue)263 Read_symbols::do_read_symbols(Workqueue* workqueue)
264 {
265   if (this->input_argument_->is_group())
266     {
267       gold_assert(this->input_group_ == NULL);
268       this->do_group(workqueue);
269       return true;
270     }
271 
272   if (this->input_argument_->is_lib())
273     return this->do_lib_group(workqueue);
274 
275   Input_file* input_file = new Input_file(&this->input_argument_->file());
276   if (!input_file->open(*this->dirpath_, this, &this->dirindex_))
277     return false;
278 
279   // Read enough of the file to pick up the entire ELF header.
280 
281   off_t filesize = input_file->file().filesize();
282 
283   if (filesize == 0)
284     {
285       gold_error(_("%s: file is empty"),
286 		 input_file->file().filename().c_str());
287       return false;
288     }
289 
290   const unsigned char* ehdr;
291   int read_size;
292   bool is_elf = is_elf_object(input_file, 0, &ehdr, &read_size);
293 
294   if (read_size >= Archive::sarmag)
295     {
296       bool is_thin_archive
297           = memcmp(ehdr, Archive::armagt, Archive::sarmag) == 0;
298       if (is_thin_archive
299           || memcmp(ehdr, Archive::armag, Archive::sarmag) == 0)
300 	{
301 	  // This is an archive.
302 	  Archive* arch = new Archive(this->input_argument_->file().name(),
303 				      input_file, is_thin_archive,
304 				      this->dirpath_, this);
305 	  arch->setup();
306 
307 	  // Unlock the archive so it can be used in the next task.
308 	  arch->unlock(this);
309 
310 	  workqueue->queue_next(new Add_archive_symbols(this->symtab_,
311 							this->layout_,
312 							this->input_objects_,
313 							this->dirpath_,
314 							this->dirindex_,
315 							this->mapfile_,
316 							this->input_argument_,
317 							arch,
318 							this->input_group_,
319 							this->this_blocker_,
320 							this->next_blocker_));
321 	  return true;
322 	}
323     }
324 
325   Object* elf_obj = NULL;
326   bool unconfigured;
327   bool* punconfigured = NULL;
328   if (is_elf)
329     {
330       // This is an ELF object.
331 
332       unconfigured = false;
333       punconfigured = (input_file->will_search_for()
334 		       ? &unconfigured
335 		       : NULL);
336       elf_obj = make_elf_object(input_file->filename(),
337 				input_file, 0, ehdr, read_size,
338 				punconfigured);
339     }
340 
341   if (parameters->options().has_plugins())
342     {
343       Pluginobj* obj = parameters->options().plugins()->claim_file(input_file,
344                                                                    0, filesize,
345 								   elf_obj);
346       if (obj != NULL)
347         {
348 	  // Delete the elf_obj, this file has been claimed.
349 	  if (elf_obj != NULL)
350 	    delete elf_obj;
351 
352           // The input file was claimed by a plugin, and its symbols
353           // have been provided by the plugin.
354 
355           // We are done with the file at this point, so unlock it.
356           obj->unlock(this);
357 
358           if (this->member_ != NULL)
359 	    {
360 	      this->member_->sd_ = NULL;
361 	      this->member_->obj_ = obj;
362 	      return true;
363 	    }
364 
365           workqueue->queue_next(new Add_symbols(this->input_objects_,
366                                                 this->symtab_,
367                                                 this->layout_,
368 						this->dirpath_,
369 						this->dirindex_,
370 						this->mapfile_,
371 						this->input_argument_,
372                                                 obj,
373                                                 NULL,
374 						NULL,
375                                                 this->this_blocker_,
376                                                 this->next_blocker_));
377           return true;
378         }
379     }
380 
381   if (is_elf)
382     {
383       // This is an ELF object.
384 
385       if (elf_obj == NULL)
386 	{
387 	  if (unconfigured)
388 	    {
389 	      Read_symbols::incompatible_warning(this->input_argument_,
390 						 input_file);
391 	      input_file->file().release();
392 	      input_file->file().unlock(this);
393 	      delete input_file;
394 	      ++this->dirindex_;
395 	      return this->do_read_symbols(workqueue);
396 	    }
397 	  return false;
398 	}
399 
400       Read_symbols_data* sd = new Read_symbols_data;
401       elf_obj->read_symbols(sd);
402 
403       // Opening the file locked it, so now we need to unlock it.  We
404       // need to unlock it before queuing the Add_symbols task,
405       // because the workqueue doesn't know about our lock on the
406       // file.  If we queue the Add_symbols task first, it will be
407       // stuck on the end of the file lock, but since the workqueue
408       // doesn't know about that lock, it will never release the
409       // Add_symbols task.
410 
411       input_file->file().unlock(this);
412 
413       if (this->member_ != NULL)
414         {
415           this->member_->sd_ = sd;
416           this->member_->obj_ = elf_obj;
417           this->member_->arg_serial_ =
418               this->input_argument_->file().arg_serial();
419           return true;
420         }
421 
422       // We use queue_next because everything is cached for this
423       // task to run right away if possible.
424 
425       workqueue->queue_next(new Add_symbols(this->input_objects_,
426 					    this->symtab_, this->layout_,
427 					    this->dirpath_,
428 					    this->dirindex_,
429 					    this->mapfile_,
430 					    this->input_argument_,
431 					    elf_obj,
432 					    NULL,
433 					    sd,
434 					    this->this_blocker_,
435 					    this->next_blocker_));
436 
437       return true;
438     }
439 
440   // Queue up a task to try to parse this file as a script.  We use a
441   // separate task so that the script will be read in order with other
442   // objects named on the command line.  Also so that we don't try to
443   // read multiple scripts simultaneously, which could lead to
444   // unpredictable changes to the General_options structure.
445 
446   workqueue->queue_soon(new Read_script(this->symtab_,
447 					this->layout_,
448 					this->dirpath_,
449 					this->dirindex_,
450 					this->input_objects_,
451 					this->mapfile_,
452 					this->input_group_,
453 					this->input_argument_,
454 					input_file,
455 					this->this_blocker_,
456 					this->next_blocker_));
457   return true;
458 }
459 
460 // Handle a group.  We need to walk through the arguments over and
461 // over until we don't see any new undefined symbols.  We do this by
462 // setting off Read_symbols Tasks as usual, but recording the archive
463 // entries instead of deleting them.  We also start a Finish_group
464 // Task which runs after we've read all the symbols.  In that task we
465 // process the archives in a loop until we are done.
466 
467 void
do_group(Workqueue * workqueue)468 Read_symbols::do_group(Workqueue* workqueue)
469 {
470   Input_group* input_group = new Input_group();
471 
472   const Input_file_group* group = this->input_argument_->group();
473   Task_token* this_blocker = this->this_blocker_;
474 
475   Finish_group* finish_group = new Finish_group(this->input_objects_,
476 						this->symtab_,
477 						this->layout_,
478 						this->mapfile_,
479 						input_group,
480 						this->next_blocker_);
481 
482   Task_token* next_blocker = new Task_token(true);
483   next_blocker->add_blocker();
484   workqueue->queue_soon(new Start_group(this->symtab_, finish_group,
485 					this_blocker, next_blocker));
486   this_blocker = next_blocker;
487 
488   for (Input_file_group::const_iterator p = group->begin();
489        p != group->end();
490        ++p)
491     {
492       const Input_argument* arg = &*p;
493       gold_assert(arg->is_file());
494 
495       next_blocker = new Task_token(true);
496       next_blocker->add_blocker();
497       workqueue->queue_soon(new Read_symbols(this->input_objects_,
498 					     this->symtab_, this->layout_,
499 					     this->dirpath_, this->dirindex_,
500 					     this->mapfile_, arg, input_group,
501 					     NULL, this_blocker, next_blocker));
502       this_blocker = next_blocker;
503     }
504 
505   finish_group->set_blocker(this_blocker);
506 
507   workqueue->queue_soon(finish_group);
508 }
509 
510 // Return a debugging name for a Read_symbols task.
511 
512 std::string
get_name() const513 Read_symbols::get_name() const
514 {
515   if (this->input_argument_->is_group())
516     {
517       std::string ret("Read_symbols group (");
518       bool add_space = false;
519       const Input_file_group* group = this->input_argument_->group();
520       for (Input_file_group::const_iterator p = group->begin();
521            p != group->end();
522            ++p)
523       {
524         if (add_space)
525           ret += ' ';
526         ret += p->file().name();
527         add_space = true;
528       }
529       return ret + ')';
530     }
531   else if (this->input_argument_->is_lib())
532     {
533       std::string ret("Read_symbols lib (");
534       bool add_space = false;
535       const Input_file_lib* lib = this->input_argument_->lib();
536       for (Input_file_lib::const_iterator p = lib->begin();
537            p != lib->end();
538            ++p)
539       {
540         if (add_space)
541           ret += ' ';
542         ret += p->file().name();
543         add_space = true;
544       }
545       return ret + ')';
546     }
547   else
548     {
549       std::string ret("Read_symbols ");
550       if (this->input_argument_->file().is_lib())
551 	ret += "-l";
552       else if (this->input_argument_->file().is_searched_file())
553 	ret += "-l:";
554       ret += this->input_argument_->file().name();
555       return ret;
556     }
557 }
558 
559 // Class Add_symbols.
560 
~Add_symbols()561 Add_symbols::~Add_symbols()
562 {
563   if (this->this_blocker_ != NULL)
564     delete this->this_blocker_;
565   // next_blocker_ is deleted by the task associated with the next
566   // input file.
567 }
568 
569 // We are blocked by this_blocker_.  We block next_blocker_.  We also
570 // lock the file.
571 
572 Task_token*
is_runnable()573 Add_symbols::is_runnable()
574 {
575   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
576     return this->this_blocker_;
577   if (this->object_->is_locked())
578     return this->object_->token();
579   return NULL;
580 }
581 
582 void
locks(Task_locker * tl)583 Add_symbols::locks(Task_locker* tl)
584 {
585   tl->add(this, this->next_blocker_);
586   Task_token* token = this->object_->token();
587   if (token != NULL)
588     tl->add(this, token);
589 }
590 
591 // Add the symbols in the object to the symbol table.
592 
593 void
run(Workqueue *)594 Add_symbols::run(Workqueue*)
595 {
596   Pluginobj* pluginobj = this->object_->pluginobj();
597   if (pluginobj != NULL)
598     {
599       this->object_->add_symbols(this->symtab_, this->sd_, this->layout_);
600       return;
601     }
602 
603   if (!this->input_objects_->add_object(this->object_))
604     {
605       this->object_->discard_decompressed_sections();
606       gold_assert(this->sd_ != NULL);
607       delete this->sd_;
608       this->sd_ = NULL;
609       this->object_->release();
610       delete this->object_;
611     }
612   else
613     {
614       Incremental_inputs* incremental_inputs =
615           this->layout_->incremental_inputs();
616       if (incremental_inputs != NULL)
617 	{
618           if (this->library_ != NULL && !this->library_->is_reported())
619             {
620               Incremental_binary* ibase = this->layout_->incremental_base();
621               gold_assert(ibase != NULL);
622               unsigned int lib_serial = this->library_->arg_serial();
623               unsigned int lib_index = this->library_->input_file_index();
624 	      Script_info* lib_script_info = ibase->get_script_info(lib_index);
625 	      incremental_inputs->report_archive_begin(this->library_,
626 						       lib_serial,
627 						       lib_script_info);
628 	    }
629 	  unsigned int arg_serial = this->input_argument_->file().arg_serial();
630 	  Script_info* script_info = this->input_argument_->script_info();
631 	  incremental_inputs->report_object(this->object_, arg_serial,
632 					    this->library_, script_info);
633 	}
634       this->object_->layout(this->symtab_, this->layout_, this->sd_);
635       this->object_->add_symbols(this->symtab_, this->sd_, this->layout_);
636       this->object_->discard_decompressed_sections();
637       delete this->sd_;
638       this->sd_ = NULL;
639       this->object_->release();
640     }
641 }
642 
643 // Class Read_member.
644 
~Read_member()645 Read_member::~Read_member()
646 {
647   if (this->this_blocker_ != NULL)
648     delete this->this_blocker_;
649   // next_blocker_ is deleted by the task associated with the next
650   // input file.
651 }
652 
653 // Return whether a Read_member task is runnable.
654 
655 Task_token*
is_runnable()656 Read_member::is_runnable()
657 {
658   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
659     return this->this_blocker_;
660   return NULL;
661 }
662 
663 void
locks(Task_locker * tl)664 Read_member::locks(Task_locker* tl)
665 {
666   tl->add(this, this->next_blocker_);
667 }
668 
669 // Run a Read_member task.
670 
671 void
run(Workqueue *)672 Read_member::run(Workqueue*)
673 {
674   // This task doesn't need to do anything for now.  The Read_symbols task
675   // that is queued for the archive library will cause the archive to be
676   // processed from scratch.
677 }
678 
679 // Class Check_script.
680 
~Check_script()681 Check_script::~Check_script()
682 {
683   if (this->this_blocker_ != NULL)
684     delete this->this_blocker_;
685   // next_blocker_ is deleted by the task associated with the next
686   // input file.
687 }
688 
689 // Return whether a Check_script task is runnable.
690 
691 Task_token*
is_runnable()692 Check_script::is_runnable()
693 {
694   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
695     return this->this_blocker_;
696   return NULL;
697 }
698 
699 void
locks(Task_locker * tl)700 Check_script::locks(Task_locker* tl)
701 {
702   tl->add(this, this->next_blocker_);
703 }
704 
705 // Run a Check_script task.
706 
707 void
run(Workqueue *)708 Check_script::run(Workqueue*)
709 {
710   Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
711   gold_assert(incremental_inputs != NULL);
712   unsigned int arg_serial = this->input_reader_->arg_serial();
713   Script_info* script_info =
714       this->ibase_->get_script_info(this->input_file_index_);
715   Timespec mtime = this->input_reader_->get_mtime();
716   incremental_inputs->report_script(script_info, arg_serial, mtime);
717 }
718 
719 // Class Check_library.
720 
~Check_library()721 Check_library::~Check_library()
722 {
723   if (this->this_blocker_ != NULL)
724     delete this->this_blocker_;
725   // next_blocker_ is deleted by the task associated with the next
726   // input file.
727 }
728 
729 // Return whether a Check_library task is runnable.
730 
731 Task_token*
is_runnable()732 Check_library::is_runnable()
733 {
734   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
735     return this->this_blocker_;
736   return NULL;
737 }
738 
739 void
locks(Task_locker * tl)740 Check_library::locks(Task_locker* tl)
741 {
742   tl->add(this, this->next_blocker_);
743 }
744 
745 // Run a Check_library task.
746 
747 void
run(Workqueue *)748 Check_library::run(Workqueue*)
749 {
750   Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
751   gold_assert(incremental_inputs != NULL);
752   Incremental_library* lib = this->ibase_->get_library(this->input_file_index_);
753   gold_assert(lib != NULL);
754   lib->copy_unused_symbols();
755   // FIXME: Check that unused symbols remain unused.
756   if (!lib->is_reported())
757     {
758       unsigned int lib_serial = lib->arg_serial();
759       unsigned int lib_index = lib->input_file_index();
760       Script_info* script_info = this->ibase_->get_script_info(lib_index);
761       incremental_inputs->report_archive_begin(lib, lib_serial, script_info);
762     }
763   incremental_inputs->report_archive_end(lib);
764 }
765 
766 // Class Input_group.
767 
768 // When we delete an Input_group we can delete the archive
769 // information.
770 
~Input_group()771 Input_group::~Input_group()
772 {
773   for (Input_group::const_iterator p = this->begin();
774        p != this->end();
775        ++p)
776     delete *p;
777 }
778 
779 // Class Start_group.
780 
~Start_group()781 Start_group::~Start_group()
782 {
783   if (this->this_blocker_ != NULL)
784     delete this->this_blocker_;
785   // next_blocker_ is deleted by the task associated with the first
786   // file in the group.
787 }
788 
789 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
790 
791 Task_token*
is_runnable()792 Start_group::is_runnable()
793 {
794   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
795     return this->this_blocker_;
796   return NULL;
797 }
798 
799 void
locks(Task_locker * tl)800 Start_group::locks(Task_locker* tl)
801 {
802   tl->add(this, this->next_blocker_);
803 }
804 
805 // Store the number of undefined symbols we see now.
806 
807 void
run(Workqueue *)808 Start_group::run(Workqueue*)
809 {
810   this->finish_group_->set_saw_undefined(this->symtab_->saw_undefined());
811 }
812 
813 // Class Finish_group.
814 
~Finish_group()815 Finish_group::~Finish_group()
816 {
817   if (this->this_blocker_ != NULL)
818     delete this->this_blocker_;
819   // next_blocker_ is deleted by the task associated with the next
820   // input file following the group.
821 }
822 
823 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
824 
825 Task_token*
is_runnable()826 Finish_group::is_runnable()
827 {
828   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
829     return this->this_blocker_;
830   return NULL;
831 }
832 
833 void
locks(Task_locker * tl)834 Finish_group::locks(Task_locker* tl)
835 {
836   tl->add(this, this->next_blocker_);
837 }
838 
839 // Loop over the archives until there are no new undefined symbols.
840 
841 void
run(Workqueue *)842 Finish_group::run(Workqueue*)
843 {
844   size_t saw_undefined = this->saw_undefined_;
845   while (saw_undefined != this->symtab_->saw_undefined())
846     {
847       saw_undefined = this->symtab_->saw_undefined();
848 
849       for (Input_group::const_iterator p = this->input_group_->begin();
850 	   p != this->input_group_->end();
851 	   ++p)
852 	{
853 	  Task_lock_obj<Archive> tl(this, *p);
854 
855 	  (*p)->add_symbols(this->symtab_, this->layout_,
856 			    this->input_objects_, this->mapfile_);
857 	}
858     }
859 
860   // Now that we're done with the archives, record the incremental
861   // layout information.
862   for (Input_group::const_iterator p = this->input_group_->begin();
863        p != this->input_group_->end();
864        ++p)
865     {
866       // For an incremental link, finish recording the layout information.
867       Incremental_inputs* incremental_inputs =
868           this->layout_->incremental_inputs();
869       if (incremental_inputs != NULL)
870 	incremental_inputs->report_archive_end(*p);
871     }
872 
873   if (parameters->options().has_plugins())
874     parameters->options().plugins()->save_input_group(this->input_group_);
875   else
876     delete this->input_group_;
877 }
878 
879 // Class Read_script
880 
~Read_script()881 Read_script::~Read_script()
882 {
883   if (this->this_blocker_ != NULL)
884     delete this->this_blocker_;
885   // next_blocker_ is deleted by the task associated with the next
886   // input file.
887 }
888 
889 // We are blocked by this_blocker_.
890 
891 Task_token*
is_runnable()892 Read_script::is_runnable()
893 {
894   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
895     return this->this_blocker_;
896   return NULL;
897 }
898 
899 // We don't unlock next_blocker_ here.  If the script names any input
900 // files, then the last file will be responsible for unlocking it.
901 
902 void
locks(Task_locker *)903 Read_script::locks(Task_locker*)
904 {
905 }
906 
907 // Read the script, if it is a script.
908 
909 void
run(Workqueue * workqueue)910 Read_script::run(Workqueue* workqueue)
911 {
912   bool used_next_blocker;
913   if (!read_input_script(workqueue, this->symtab_, this->layout_,
914 			 this->dirpath_, this->dirindex_, this->input_objects_,
915 			 this->mapfile_, this->input_group_,
916 			 this->input_argument_, this->input_file_,
917 			 this->next_blocker_, &used_next_blocker))
918     {
919       // Here we have to handle any other input file types we need.
920       gold_error(_("%s: not an object or archive"),
921 		 this->input_file_->file().filename().c_str());
922     }
923 
924   if (!used_next_blocker)
925     {
926       // Queue up a task to unlock next_blocker.  We can't just unlock
927       // it here, as we don't hold the workqueue lock.
928       workqueue->queue_soon(new Unblock_token(NULL, this->next_blocker_));
929     }
930 }
931 
932 // Return a debugging name for a Read_script task.
933 
934 std::string
get_name() const935 Read_script::get_name() const
936 {
937   std::string ret("Read_script ");
938   if (this->input_argument_->file().is_lib())
939     ret += "-l";
940   else if (this->input_argument_->file().is_searched_file())
941     ret += "-l:";
942   ret += this->input_argument_->file().name();
943   return ret;
944 }
945 
946 } // End namespace gold.
947