contrib/binutils-2.22/gold/readsyms.cc

   1 // readsyms.cc -- read input file symbols for gold
   2
   3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 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:
  52   Unblock_token(Task_token* this_blocker, Task_token* next_blocker)
  53     : this_blocker_(this_blocker), next_blocker_(next_blocker)
  54   { }
  55
  56   ~Unblock_token()
  57   {
  58     if (this->this_blocker_ != NULL)
  59       delete this->this_blocker_;
  60   }
  61
  62   Task_token*
  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
  71   locks(Task_locker* tl)
  72   { tl->add(this, this->next_blocker_); }
  73
  74   void
  75   run(Workqueue*)
  76   { }
  77
  78   std::string
  79   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
  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
  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
 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*
 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
 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
 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.
 165   if (!this->do_read_symbols(workqueue))
 166     workqueue->queue_soon(new Unblock_token(this->this_blocker_,
 167                                             this->next_blocker_));
 168 }
 169
 170 // Handle a whole lib group. Other than collecting statistics, this just
 171 // mimics what we do for regular object files in the command line.
 172
 173 bool
 174 Read_symbols::do_whole_lib_group(Workqueue* workqueue)
 175 {
 176   const Input_file_lib* lib_group = this->input_argument_->lib();
 177
 178   ++Lib_group::total_lib_groups;
 179
 180   Task_token* this_blocker = this->this_blocker_;
 181   for (Input_file_lib::const_iterator i = lib_group->begin();
 182        i != lib_group->end();
 183        ++i)
 184     {
 185       ++Lib_group::total_members;
 186       ++Lib_group::total_members_loaded;
 187
 188       const Input_argument* arg = &*i;
 189
 190       Task_token* next_blocker;
 191       if (i != lib_group->end() - 1)
 192         {
 193           next_blocker = new Task_token(true);
 194           next_blocker->add_blocker();
 195         }
 196       else
 197         next_blocker = this->next_blocker_;
 198
 199       workqueue->queue_soon(new Read_symbols(this->input_objects_,
 200                                              this->symtab_, this->layout_,
 201                                              this->dirpath_, this->dirindex_,
 202                                              this->mapfile_, arg, NULL,
 203                                              NULL, this_blocker, next_blocker));
 204       this_blocker = next_blocker;
 205     }
 206
 207   return true;
 208 }
 209
 210 // Handle a lib group. We set Read_symbols Tasks as usual, but have them
 211 // just record the symbol data instead of adding the objects.  We also start
 212 // a Add_lib_group_symbols Task which runs after we've read all the symbols.
 213 // In that task we process the members in a loop until we are done.
 214
 215 bool
 216 Read_symbols::do_lib_group(Workqueue* workqueue)
 217 {
 218   const Input_file_lib* lib_group = this->input_argument_->lib();
 219
 220   if (lib_group->options().whole_archive())
 221     return this->do_whole_lib_group(workqueue);
 222
 223   Lib_group* lib = new Lib_group(lib_group, this);
 224
 225   Add_lib_group_symbols* add_lib_group_symbols =
 226     new Add_lib_group_symbols(this->symtab_, this->layout_,
 227                               this->input_objects_,
 228                               lib, this->next_blocker_);
 229
 230
 231   Task_token* next_blocker = new Task_token(true);
 232   int j = 0;
 233   for (Input_file_lib::const_iterator i = lib_group->begin();
 234        i != lib_group->end();
 235        ++i, ++j)
 236     {
 237       const Input_argument* arg = &*i;
 238       Archive_member* m = lib->get_member(j);
 239
 240       next_blocker->add_blocker();
 241
 242       // Since this Read_symbols will not create an Add_symbols,
 243       // just pass NULL as this_blocker.
 244       workqueue->queue_soon(new Read_symbols(this->input_objects_,
 245                                              this->symtab_, this->layout_,
 246                                              this->dirpath_, this->dirindex_,
 247                                              this->mapfile_, arg, NULL,
 248                                              m, NULL, next_blocker));
 249     }
 250
 251   add_lib_group_symbols->set_blocker(next_blocker, this->this_blocker_);
 252   workqueue->queue_soon(add_lib_group_symbols);
 253
 254   return true;
 255 }
 256
 257 // Open the file and read the symbols.  Return true if a new task was
 258 // queued, false if that could not happen due to some error.
 259
 260 bool
 261 Read_symbols::do_read_symbols(Workqueue* workqueue)
 262 {
 263   if (this->input_argument_->is_group())
 264     {
 265       gold_assert(this->input_group_ == NULL);
 266       this->do_group(workqueue);
 267       return true;
 268     }
 269
 270   if (this->input_argument_->is_lib())
 271     return this->do_lib_group(workqueue);
 272
 273   Input_file* input_file = new Input_file(&this->input_argument_->file());
 274   if (!input_file->open(*this->dirpath_, this, &this->dirindex_))
 275     return false;
 276
 277   // Read enough of the file to pick up the entire ELF header.
 278
 279   off_t filesize = input_file->file().filesize();
 280
 281   if (filesize == 0)
 282     {
 283       gold_error(_("%s: file is empty"),
 284                  input_file->file().filename().c_str());
 285       return false;
 286     }
 287
 288   const unsigned char* ehdr;
 289   int read_size;
 290   bool is_elf = is_elf_object(input_file, 0, &ehdr, &read_size);
 291
 292   if (read_size >= Archive::sarmag)
 293     {
 294       bool is_thin_archive
 295           = memcmp(ehdr, Archive::armagt, Archive::sarmag) == 0;
 296       if (is_thin_archive
 297           || memcmp(ehdr, Archive::armag, Archive::sarmag) == 0)
 298         {
 299           // This is an archive.
 300           Archive* arch = new Archive(this->input_argument_->file().name(),
 301                                       input_file, is_thin_archive,
 302                                       this->dirpath_, this);
 303           arch->setup();
 304
 305           // Unlock the archive so it can be used in the next task.
 306           arch->unlock(this);
 307
 308           workqueue->queue_next(new Add_archive_symbols(this->symtab_,
 309                                                         this->layout_,
 310                                                         this->input_objects_,
 311                                                         this->dirpath_,
 312                                                         this->dirindex_,
 313                                                         this->mapfile_,
 314                                                         this->input_argument_,
 315                                                         arch,
 316                                                         this->input_group_,
 317                                                         this->this_blocker_,
 318                                                         this->next_blocker_));
 319           return true;
 320         }
 321     }
 322
 323   Object* elf_obj = NULL;
 324   bool unconfigured;
 325   bool* punconfigured = NULL;
 326   if (is_elf)
 327     {
 328       // This is an ELF object.
 329
 330       unconfigured = false;
 331       punconfigured = (input_file->will_search_for()
 332                        ? &unconfigured
 333                        : NULL);
 334       elf_obj = make_elf_object(input_file->filename(),
 335                                 input_file, 0, ehdr, read_size,
 336                                 punconfigured);
 337     }
 338
 339   if (parameters->options().has_plugins())
 340     {
 341       Pluginobj* obj = parameters->options().plugins()->claim_file(input_file,
 342                                                                    0, filesize,
 343                                                                    elf_obj);
 344       if (obj != NULL)
 345         {
 346           // Delete the elf_obj, this file has been claimed.
 347           if (elf_obj != NULL)
 348             delete elf_obj;
 349
 350           // The input file was claimed by a plugin, and its symbols
 351           // have been provided by the plugin.
 352
 353           // We are done with the file at this point, so unlock it.
 354           obj->unlock(this);
 355
 356           if (this->member_ != NULL)
 357             {
 358               this->member_->sd_ = NULL;
 359               this->member_->obj_ = obj;
 360               return true;
 361             }
 362
 363           workqueue->queue_next(new Add_symbols(this->input_objects_,
 364                                                 this->symtab_,
 365                                                 this->layout_,
 366                                                 this->dirpath_,
 367                                                 this->dirindex_,
 368                                                 this->mapfile_,
 369                                                 this->input_argument_,
 370                                                 obj,
 371                                                 NULL,
 372                                                 NULL,
 373                                                 this->this_blocker_,
 374                                                 this->next_blocker_));
 375           return true;
 376         }
 377     }
 378
 379   if (is_elf)
 380     {
 381       // This is an ELF object.
 382
 383       if (elf_obj == NULL)
 384         {
 385           if (unconfigured)
 386             {
 387               Read_symbols::incompatible_warning(this->input_argument_,
 388                                                  input_file);
 389               input_file->file().release();
 390               input_file->file().unlock(this);
 391               delete input_file;
 392               ++this->dirindex_;
 393               return this->do_read_symbols(workqueue);
 394             }
 395           return false;
 396         }
 397
 398       Read_symbols_data* sd = new Read_symbols_data;
 399       elf_obj->read_symbols(sd);
 400
 401       // Opening the file locked it, so now we need to unlock it.  We
 402       // need to unlock it before queuing the Add_symbols task,
 403       // because the workqueue doesn't know about our lock on the
 404       // file.  If we queue the Add_symbols task first, it will be
 405       // stuck on the end of the file lock, but since the workqueue
 406       // doesn't know about that lock, it will never release the
 407       // Add_symbols task.
 408
 409       input_file->file().unlock(this);
 410
 411       if (this->member_ != NULL)
 412         {
 413           this->member_->sd_ = sd;
 414           this->member_->obj_ = elf_obj;
 415           this->member_->arg_serial_ =
 416               this->input_argument_->file().arg_serial();
 417           return true;
 418         }
 419
 420       // We use queue_next because everything is cached for this
 421       // task to run right away if possible.
 422
 423       workqueue->queue_next(new Add_symbols(this->input_objects_,
 424                                             this->symtab_, this->layout_,
 425                                             this->dirpath_,
 426                                             this->dirindex_,
 427                                             this->mapfile_,
 428                                             this->input_argument_,
 429                                             elf_obj,
 430                                             NULL,
 431                                             sd,
 432                                             this->this_blocker_,
 433                                             this->next_blocker_));
 434
 435       return true;
 436     }
 437
 438   // Queue up a task to try to parse this file as a script.  We use a
 439   // separate task so that the script will be read in order with other
 440   // objects named on the command line.  Also so that we don't try to
 441   // read multiple scripts simultaneously, which could lead to
 442   // unpredictable changes to the General_options structure.
 443
 444   workqueue->queue_soon(new Read_script(this->symtab_,
 445                                         this->layout_,
 446                                         this->dirpath_,
 447                                         this->dirindex_,
 448                                         this->input_objects_,
 449                                         this->mapfile_,
 450                                         this->input_group_,
 451                                         this->input_argument_,
 452                                         input_file,
 453                                         this->this_blocker_,
 454                                         this->next_blocker_));
 455   return true;
 456 }
 457
 458 // Handle a group.  We need to walk through the arguments over and
 459 // over until we don't see any new undefined symbols.  We do this by
 460 // setting off Read_symbols Tasks as usual, but recording the archive
 461 // entries instead of deleting them.  We also start a Finish_group
 462 // Task which runs after we've read all the symbols.  In that task we
 463 // process the archives in a loop until we are done.
 464
 465 void
 466 Read_symbols::do_group(Workqueue* workqueue)
 467 {
 468   Input_group* input_group = new Input_group();
 469
 470   const Input_file_group* group = this->input_argument_->group();
 471   Task_token* this_blocker = this->this_blocker_;
 472
 473   Finish_group* finish_group = new Finish_group(this->input_objects_,
 474                                                 this->symtab_,
 475                                                 this->layout_,
 476                                                 this->mapfile_,
 477                                                 input_group,
 478                                                 this->next_blocker_);
 479
 480   Task_token* next_blocker = new Task_token(true);
 481   next_blocker->add_blocker();
 482   workqueue->queue_soon(new Start_group(this->symtab_, finish_group,
 483                                         this_blocker, next_blocker));
 484   this_blocker = next_blocker;
 485
 486   for (Input_file_group::const_iterator p = group->begin();
 487        p != group->end();
 488        ++p)
 489     {
 490       const Input_argument* arg = &*p;
 491       gold_assert(arg->is_file());
 492
 493       next_blocker = new Task_token(true);
 494       next_blocker->add_blocker();
 495       workqueue->queue_soon(new Read_symbols(this->input_objects_,
 496                                              this->symtab_, this->layout_,
 497                                              this->dirpath_, this->dirindex_,
 498                                              this->mapfile_, arg, input_group,
 499                                              NULL, this_blocker, next_blocker));
 500       this_blocker = next_blocker;
 501     }
 502
 503   finish_group->set_blocker(this_blocker);
 504
 505   workqueue->queue_soon(finish_group);
 506 }
 507
 508 // Return a debugging name for a Read_symbols task.
 509
 510 std::string
 511 Read_symbols::get_name() const
 512 {
 513   if (this->input_argument_->is_group())
 514     {
 515       std::string ret("Read_symbols group (");
 516       bool add_space = false;
 517       const Input_file_group* group = this->input_argument_->group();
 518       for (Input_file_group::const_iterator p = group->begin();
 519            p != group->end();
 520            ++p)
 521       {
 522         if (add_space)
 523           ret += ' ';
 524         ret += p->file().name();
 525         add_space = true;
 526       }
 527       return ret + ')';
 528     }
 529   else if (this->input_argument_->is_lib())
 530     {
 531       std::string ret("Read_symbols lib (");
 532       bool add_space = false;
 533       const Input_file_lib* lib = this->input_argument_->lib();
 534       for (Input_file_lib::const_iterator p = lib->begin();
 535            p != lib->end();
 536            ++p)
 537       {
 538         if (add_space)
 539           ret += ' ';
 540         ret += p->file().name();
 541         add_space = true;
 542       }
 543       return ret + ')';
 544     }
 545   else
 546     {
 547       std::string ret("Read_symbols ");
 548       if (this->input_argument_->file().is_lib())
 549         ret += "-l";
 550       else if (this->input_argument_->file().is_searched_file())
 551         ret += "-l:";
 552       ret += this->input_argument_->file().name();
 553       return ret;
 554     }
 555 }
 556
 557 // Class Add_symbols.
 558
 559 Add_symbols::~Add_symbols()
 560 {
 561   if (this->this_blocker_ != NULL)
 562     delete this->this_blocker_;
 563   // next_blocker_ is deleted by the task associated with the next
 564   // input file.
 565 }
 566
 567 // We are blocked by this_blocker_.  We block next_blocker_.  We also
 568 // lock the file.
 569
 570 Task_token*
 571 Add_symbols::is_runnable()
 572 {
 573   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 574     return this->this_blocker_;
 575   if (this->object_->is_locked())
 576     return this->object_->token();
 577   return NULL;
 578 }
 579
 580 void
 581 Add_symbols::locks(Task_locker* tl)
 582 {
 583   tl->add(this, this->next_blocker_);
 584   Task_token* token = this->object_->token();
 585   if (token != NULL)
 586     tl->add(this, token);
 587 }
 588
 589 // Add the symbols in the object to the symbol table.
 590
 591 void
 592 Add_symbols::run(Workqueue*)
 593 {
 594   Pluginobj* pluginobj = this->object_->pluginobj();
 595   if (pluginobj != NULL)
 596     {
 597       this->object_->add_symbols(this->symtab_, this->sd_, this->layout_);
 598       return;
 599     }
 600
 601   if (!this->input_objects_->add_object(this->object_))
 602     {
 603       gold_assert(this->sd_ != NULL);
 604       delete this->sd_;
 605       this->sd_ = NULL;
 606       this->object_->release();
 607       delete this->object_;
 608     }
 609   else
 610     {
 611       Incremental_inputs* incremental_inputs =
 612           this->layout_->incremental_inputs();
 613       if (incremental_inputs != NULL)
 614         {
 615           if (this->library_ != NULL && !this->library_->is_reported())
 616             {
 617               Incremental_binary* ibase = this->layout_->incremental_base();
 618               gold_assert(ibase != NULL);
 619               unsigned int lib_serial = this->library_->arg_serial();
 620               unsigned int lib_index = this->library_->input_file_index();
 621               Script_info* lib_script_info = ibase->get_script_info(lib_index);
 622               incremental_inputs->report_archive_begin(this->library_,
 623                                                        lib_serial,
 624                                                        lib_script_info);
 625             }
 626           unsigned int arg_serial = this->input_argument_->file().arg_serial();
 627           Script_info* script_info = this->input_argument_->script_info();
 628           incremental_inputs->report_object(this->object_, arg_serial,
 629                                             this->library_, script_info);
 630         }
 631       this->object_->layout(this->symtab_, this->layout_, this->sd_);
 632       this->object_->add_symbols(this->symtab_, this->sd_, this->layout_);
 633       delete this->sd_;
 634       this->sd_ = NULL;
 635       this->object_->release();
 636     }
 637 }
 638
 639 // Class Read_member.
 640
 641 Read_member::~Read_member()
 642 {
 643   if (this->this_blocker_ != NULL)
 644     delete this->this_blocker_;
 645   // next_blocker_ is deleted by the task associated with the next
 646   // input file.
 647 }
 648
 649 // Return whether a Read_member task is runnable.
 650
 651 Task_token*
 652 Read_member::is_runnable()
 653 {
 654   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 655     return this->this_blocker_;
 656   return NULL;
 657 }
 658
 659 void
 660 Read_member::locks(Task_locker* tl)
 661 {
 662   tl->add(this, this->next_blocker_);
 663 }
 664
 665 // Run a Read_member task.
 666
 667 void
 668 Read_member::run(Workqueue*)
 669 {
 670   // This task doesn't need to do anything for now.  The Read_symbols task
 671   // that is queued for the archive library will cause the archive to be
 672   // processed from scratch.
 673 }
 674
 675 // Class Check_script.
 676
 677 Check_script::~Check_script()
 678 {
 679   if (this->this_blocker_ != NULL)
 680     delete this->this_blocker_;
 681   // next_blocker_ is deleted by the task associated with the next
 682   // input file.
 683 }
 684
 685 // Return whether a Check_script task is runnable.
 686
 687 Task_token*
 688 Check_script::is_runnable()
 689 {
 690   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 691     return this->this_blocker_;
 692   return NULL;
 693 }
 694
 695 void
 696 Check_script::locks(Task_locker* tl)
 697 {
 698   tl->add(this, this->next_blocker_);
 699 }
 700
 701 // Run a Check_script task.
 702
 703 void
 704 Check_script::run(Workqueue*)
 705 {
 706   Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
 707   gold_assert(incremental_inputs != NULL);
 708   unsigned int arg_serial = this->input_reader_->arg_serial();
 709   Script_info* script_info =
 710       this->ibase_->get_script_info(this->input_file_index_);
 711   Timespec mtime = this->input_reader_->get_mtime();
 712   incremental_inputs->report_script(script_info, arg_serial, mtime);
 713 }
 714
 715 // Class Check_library.
 716
 717 Check_library::~Check_library()
 718 {
 719   if (this->this_blocker_ != NULL)
 720     delete this->this_blocker_;
 721   // next_blocker_ is deleted by the task associated with the next
 722   // input file.
 723 }
 724
 725 // Return whether a Check_library task is runnable.
 726
 727 Task_token*
 728 Check_library::is_runnable()
 729 {
 730   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 731     return this->this_blocker_;
 732   return NULL;
 733 }
 734
 735 void
 736 Check_library::locks(Task_locker* tl)
 737 {
 738   tl->add(this, this->next_blocker_);
 739 }
 740
 741 // Run a Check_library task.
 742
 743 void
 744 Check_library::run(Workqueue*)
 745 {
 746   Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
 747   gold_assert(incremental_inputs != NULL);
 748   Incremental_library* lib = this->ibase_->get_library(this->input_file_index_);
 749   gold_assert(lib != NULL);
 750   lib->copy_unused_symbols();
 751   // FIXME: Check that unused symbols remain unused.
 752   if (!lib->is_reported())
 753     {
 754       unsigned int lib_serial = lib->arg_serial();
 755       unsigned int lib_index = lib->input_file_index();
 756       Script_info* script_info = this->ibase_->get_script_info(lib_index);
 757       incremental_inputs->report_archive_begin(lib, lib_serial, script_info);
 758     }
 759   incremental_inputs->report_archive_end(lib);
 760 }
 761
 762 // Class Input_group.
 763
 764 // When we delete an Input_group we can delete the archive
 765 // information.
 766
 767 Input_group::~Input_group()
 768 {
 769   for (Input_group::const_iterator p = this->begin();
 770        p != this->end();
 771        ++p)
 772     delete *p;
 773 }
 774
 775 // Class Start_group.
 776
 777 Start_group::~Start_group()
 778 {
 779   if (this->this_blocker_ != NULL)
 780     delete this->this_blocker_;
 781   // next_blocker_ is deleted by the task associated with the first
 782   // file in the group.
 783 }
 784
 785 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
 786
 787 Task_token*
 788 Start_group::is_runnable()
 789 {
 790   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 791     return this->this_blocker_;
 792   return NULL;
 793 }
 794
 795 void
 796 Start_group::locks(Task_locker* tl)
 797 {
 798   tl->add(this, this->next_blocker_);
 799 }
 800
 801 // Store the number of undefined symbols we see now.
 802
 803 void
 804 Start_group::run(Workqueue*)
 805 {
 806   this->finish_group_->set_saw_undefined(this->symtab_->saw_undefined());
 807 }
 808
 809 // Class Finish_group.
 810
 811 Finish_group::~Finish_group()
 812 {
 813   if (this->this_blocker_ != NULL)
 814     delete this->this_blocker_;
 815   // next_blocker_ is deleted by the task associated with the next
 816   // input file following the group.
 817 }
 818
 819 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
 820
 821 Task_token*
 822 Finish_group::is_runnable()
 823 {
 824   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 825     return this->this_blocker_;
 826   return NULL;
 827 }
 828
 829 void
 830 Finish_group::locks(Task_locker* tl)
 831 {
 832   tl->add(this, this->next_blocker_);
 833 }
 834
 835 // Loop over the archives until there are no new undefined symbols.
 836
 837 void
 838 Finish_group::run(Workqueue*)
 839 {
 840   size_t saw_undefined = this->saw_undefined_;
 841   while (saw_undefined != this->symtab_->saw_undefined())
 842     {
 843       saw_undefined = this->symtab_->saw_undefined();
 844
 845       for (Input_group::const_iterator p = this->input_group_->begin();
 846            p != this->input_group_->end();
 847            ++p)
 848         {
 849           Task_lock_obj<Archive> tl(this, *p);
 850
 851           (*p)->add_symbols(this->symtab_, this->layout_,
 852                             this->input_objects_, this->mapfile_);
 853         }
 854     }
 855
 856   // Now that we're done with the archives, record the incremental
 857   // layout information.
 858   for (Input_group::const_iterator p = this->input_group_->begin();
 859        p != this->input_group_->end();
 860        ++p)
 861     {
 862       // For an incremental link, finish recording the layout information.
 863       Incremental_inputs* incremental_inputs =
 864           this->layout_->incremental_inputs();
 865       if (incremental_inputs != NULL)
 866         incremental_inputs->report_archive_end(*p);
 867     }
 868
 869   if (parameters->options().has_plugins())
 870     parameters->options().plugins()->save_input_group(this->input_group_);
 871   else
 872     delete this->input_group_;
 873 }
 874
 875 // Class Read_script
 876
 877 Read_script::~Read_script()
 878 {
 879   if (this->this_blocker_ != NULL)
 880     delete this->this_blocker_;
 881   // next_blocker_ is deleted by the task associated with the next
 882   // input file.
 883 }
 884
 885 // We are blocked by this_blocker_.
 886
 887 Task_token*
 888 Read_script::is_runnable()
 889 {
 890   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 891     return this->this_blocker_;
 892   return NULL;
 893 }
 894
 895 // We don't unlock next_blocker_ here.  If the script names any input
 896 // files, then the last file will be responsible for unlocking it.
 897
 898 void
 899 Read_script::locks(Task_locker*)
 900 {
 901 }
 902
 903 // Read the script, if it is a script.
 904
 905 void
 906 Read_script::run(Workqueue* workqueue)
 907 {
 908   bool used_next_blocker;
 909   if (!read_input_script(workqueue, this->symtab_, this->layout_,
 910                          this->dirpath_, this->dirindex_, this->input_objects_,
 911                          this->mapfile_, this->input_group_,
 912                          this->input_argument_, this->input_file_,
 913                          this->next_blocker_, &used_next_blocker))
 914     {
 915       // Here we have to handle any other input file types we need.
 916       gold_error(_("%s: not an object or archive"),
 917                  this->input_file_->file().filename().c_str());
 918     }
 919
 920   if (!used_next_blocker)
 921     {
 922       // Queue up a task to unlock next_blocker.  We can't just unlock
 923       // it here, as we don't hold the workqueue lock.
 924       workqueue->queue_soon(new Unblock_token(NULL, this->next_blocker_));
 925     }
 926 }
 927
 928 // Return a debugging name for a Read_script task.
 929
 930 std::string
 931 Read_script::get_name() const
 932 {
 933   std::string ret("Read_script ");
 934   if (this->input_argument_->file().is_lib())
 935     ret += "-l";
 936   else if (this->input_argument_->file().is_searched_file())
 937     ret += "-l:";
 938   ret += this->input_argument_->file().name();
 939   return ret;
 940 }
 941
 942 } // End namespace gold.