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   if (parameters->options().has_plugins())
 324     {
 325       Pluginobj* obj = parameters->options().plugins()->claim_file(input_file,
 326                                                                    0, filesize);
 327       if (obj != NULL)
 328         {
 329           // The input file was claimed by a plugin, and its symbols
 330           // have been provided by the plugin.
 331
 332           // We are done with the file at this point, so unlock it.
 333           obj->unlock(this);
 334
 335           if (this->member_ != NULL)
 336             {
 337               this->member_->sd_ = NULL;
 338               this->member_->obj_ = obj;
 339               return true;
 340             }
 341
 342           workqueue->queue_next(new Add_symbols(this->input_objects_,
 343                                                 this->symtab_,
 344                                                 this->layout_,
 345                                                 this->dirpath_,
 346                                                 this->dirindex_,
 347                                                 this->mapfile_,
 348                                                 this->input_argument_,
 349                                                 obj,
 350                                                 NULL,
 351                                                 NULL,
 352                                                 this->this_blocker_,
 353                                                 this->next_blocker_));
 354           return true;
 355         }
 356     }
 357
 358   if (is_elf)
 359     {
 360       // This is an ELF object.
 361
 362       bool unconfigured = false;
 363       bool* punconfigured = (input_file->will_search_for()
 364                              ? &unconfigured
 365                              : NULL);
 366       Object* obj = make_elf_object(input_file->filename(),
 367                                     input_file, 0, ehdr, read_size,
 368                                     punconfigured);
 369       if (obj == NULL)
 370         {
 371           if (unconfigured)
 372             {
 373               Read_symbols::incompatible_warning(this->input_argument_,
 374                                                  input_file);
 375               input_file->file().release();
 376               input_file->file().unlock(this);
 377               delete input_file;
 378               ++this->dirindex_;
 379               return this->do_read_symbols(workqueue);
 380             }
 381           return false;
 382         }
 383
 384       Read_symbols_data* sd = new Read_symbols_data;
 385       obj->read_symbols(sd);
 386
 387       // Opening the file locked it, so now we need to unlock it.  We
 388       // need to unlock it before queuing the Add_symbols task,
 389       // because the workqueue doesn't know about our lock on the
 390       // file.  If we queue the Add_symbols task first, it will be
 391       // stuck on the end of the file lock, but since the workqueue
 392       // doesn't know about that lock, it will never release the
 393       // Add_symbols task.
 394
 395       input_file->file().unlock(this);
 396
 397       if (this->member_ != NULL)
 398         {
 399           this->member_->sd_ = sd;
 400           this->member_->obj_ = obj;
 401           this->member_->arg_serial_ =
 402               this->input_argument_->file().arg_serial();
 403           return true;
 404         }
 405
 406       // We use queue_next because everything is cached for this
 407       // task to run right away if possible.
 408
 409       workqueue->queue_next(new Add_symbols(this->input_objects_,
 410                                             this->symtab_, this->layout_,
 411                                             this->dirpath_,
 412                                             this->dirindex_,
 413                                             this->mapfile_,
 414                                             this->input_argument_,
 415                                             obj,
 416                                             NULL,
 417                                             sd,
 418                                             this->this_blocker_,
 419                                             this->next_blocker_));
 420
 421       return true;
 422     }
 423
 424   // Queue up a task to try to parse this file as a script.  We use a
 425   // separate task so that the script will be read in order with other
 426   // objects named on the command line.  Also so that we don't try to
 427   // read multiple scripts simultaneously, which could lead to
 428   // unpredictable changes to the General_options structure.
 429
 430   workqueue->queue_soon(new Read_script(this->symtab_,
 431                                         this->layout_,
 432                                         this->dirpath_,
 433                                         this->dirindex_,
 434                                         this->input_objects_,
 435                                         this->mapfile_,
 436                                         this->input_group_,
 437                                         this->input_argument_,
 438                                         input_file,
 439                                         this->this_blocker_,
 440                                         this->next_blocker_));
 441   return true;
 442 }
 443
 444 // Handle a group.  We need to walk through the arguments over and
 445 // over until we don't see any new undefined symbols.  We do this by
 446 // setting off Read_symbols Tasks as usual, but recording the archive
 447 // entries instead of deleting them.  We also start a Finish_group
 448 // Task which runs after we've read all the symbols.  In that task we
 449 // process the archives in a loop until we are done.
 450
 451 void
 452 Read_symbols::do_group(Workqueue* workqueue)
 453 {
 454   Input_group* input_group = new Input_group();
 455
 456   const Input_file_group* group = this->input_argument_->group();
 457   Task_token* this_blocker = this->this_blocker_;
 458
 459   Finish_group* finish_group = new Finish_group(this->input_objects_,
 460                                                 this->symtab_,
 461                                                 this->layout_,
 462                                                 this->mapfile_,
 463                                                 input_group,
 464                                                 this->next_blocker_);
 465
 466   Task_token* next_blocker = new Task_token(true);
 467   next_blocker->add_blocker();
 468   workqueue->queue_soon(new Start_group(this->symtab_, finish_group,
 469                                         this_blocker, next_blocker));
 470   this_blocker = next_blocker;
 471
 472   for (Input_file_group::const_iterator p = group->begin();
 473        p != group->end();
 474        ++p)
 475     {
 476       const Input_argument* arg = &*p;
 477       gold_assert(arg->is_file());
 478
 479       next_blocker = new Task_token(true);
 480       next_blocker->add_blocker();
 481       workqueue->queue_soon(new Read_symbols(this->input_objects_,
 482                                              this->symtab_, this->layout_,
 483                                              this->dirpath_, this->dirindex_,
 484                                              this->mapfile_, arg, input_group,
 485                                              NULL, this_blocker, next_blocker));
 486       this_blocker = next_blocker;
 487     }
 488
 489   finish_group->set_blocker(this_blocker);
 490
 491   workqueue->queue_soon(finish_group);
 492 }
 493
 494 // Return a debugging name for a Read_symbols task.
 495
 496 std::string
 497 Read_symbols::get_name() const
 498 {
 499   if (this->input_argument_->is_group())
 500     {
 501       std::string ret("Read_symbols group (");
 502       bool add_space = false;
 503       const Input_file_group* group = this->input_argument_->group();
 504       for (Input_file_group::const_iterator p = group->begin();
 505            p != group->end();
 506            ++p)
 507       {
 508         if (add_space)
 509           ret += ' ';
 510         ret += p->file().name();
 511         add_space = true;
 512       }
 513       return ret + ')';
 514     }
 515   else if (this->input_argument_->is_lib())
 516     {
 517       std::string ret("Read_symbols lib (");
 518       bool add_space = false;
 519       const Input_file_lib* lib = this->input_argument_->lib();
 520       for (Input_file_lib::const_iterator p = lib->begin();
 521            p != lib->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
 532     {
 533       std::string ret("Read_symbols ");
 534       if (this->input_argument_->file().is_lib())
 535         ret += "-l";
 536       else if (this->input_argument_->file().is_searched_file())
 537         ret += "-l:";
 538       ret += this->input_argument_->file().name();
 539       return ret;
 540     }
 541 }
 542
 543 // Class Add_symbols.
 544
 545 Add_symbols::~Add_symbols()
 546 {
 547   if (this->this_blocker_ != NULL)
 548     delete this->this_blocker_;
 549   // next_blocker_ is deleted by the task associated with the next
 550   // input file.
 551 }
 552
 553 // We are blocked by this_blocker_.  We block next_blocker_.  We also
 554 // lock the file.
 555
 556 Task_token*
 557 Add_symbols::is_runnable()
 558 {
 559   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 560     return this->this_blocker_;
 561   if (this->object_->is_locked())
 562     return this->object_->token();
 563   return NULL;
 564 }
 565
 566 void
 567 Add_symbols::locks(Task_locker* tl)
 568 {
 569   tl->add(this, this->next_blocker_);
 570   Task_token* token = this->object_->token();
 571   if (token != NULL)
 572     tl->add(this, token);
 573 }
 574
 575 // Add the symbols in the object to the symbol table.
 576
 577 void
 578 Add_symbols::run(Workqueue*)
 579 {
 580   Pluginobj* pluginobj = this->object_->pluginobj();
 581   if (pluginobj != NULL)
 582     {
 583       this->object_->add_symbols(this->symtab_, this->sd_, this->layout_);
 584       return;
 585     }
 586
 587   if (!this->input_objects_->add_object(this->object_))
 588     {
 589       gold_assert(this->sd_ != NULL);
 590       delete this->sd_;
 591       this->sd_ = NULL;
 592       this->object_->release();
 593       delete this->object_;
 594     }
 595   else
 596     {
 597       Incremental_inputs* incremental_inputs =
 598           this->layout_->incremental_inputs();
 599       if (incremental_inputs != NULL)
 600         {
 601           if (this->library_ != NULL && !this->library_->is_reported())
 602             {
 603               Incremental_binary* ibase = this->layout_->incremental_base();
 604               gold_assert(ibase != NULL);
 605               unsigned int lib_serial = this->library_->arg_serial();
 606               unsigned int lib_index = this->library_->input_file_index();
 607               Script_info* lib_script_info = ibase->get_script_info(lib_index);
 608               incremental_inputs->report_archive_begin(this->library_,
 609                                                        lib_serial,
 610                                                        lib_script_info);
 611             }
 612           unsigned int arg_serial = this->input_argument_->file().arg_serial();
 613           Script_info* script_info = this->input_argument_->script_info();
 614           incremental_inputs->report_object(this->object_, arg_serial,
 615                                             this->library_, script_info);
 616         }
 617       this->object_->layout(this->symtab_, this->layout_, this->sd_);
 618       this->object_->add_symbols(this->symtab_, this->sd_, this->layout_);
 619       delete this->sd_;
 620       this->sd_ = NULL;
 621       this->object_->release();
 622     }
 623 }
 624
 625 // Class Read_member.
 626
 627 Read_member::~Read_member()
 628 {
 629   if (this->this_blocker_ != NULL)
 630     delete this->this_blocker_;
 631   // next_blocker_ is deleted by the task associated with the next
 632   // input file.
 633 }
 634
 635 // Return whether a Read_member task is runnable.
 636
 637 Task_token*
 638 Read_member::is_runnable()
 639 {
 640   return NULL;
 641 }
 642
 643 void
 644 Read_member::locks(Task_locker* tl)
 645 {
 646   tl->add(this, this->next_blocker_);
 647 }
 648
 649 // Run a Read_member task.
 650
 651 void
 652 Read_member::run(Workqueue*)
 653 {
 654   // This task doesn't need to do anything for now.  The Read_symbols task
 655   // that is queued for the archive library will cause the archive to be
 656   // processed from scratch.
 657 }
 658
 659 // Class Check_script.
 660
 661 Check_script::~Check_script()
 662 {
 663   if (this->this_blocker_ != NULL)
 664     delete this->this_blocker_;
 665   // next_blocker_ is deleted by the task associated with the next
 666   // input file.
 667 }
 668
 669 // Return whether a Check_script task is runnable.
 670
 671 Task_token*
 672 Check_script::is_runnable()
 673 {
 674   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 675     return this->this_blocker_;
 676   return NULL;
 677 }
 678
 679 void
 680 Check_script::locks(Task_locker* tl)
 681 {
 682   tl->add(this, this->next_blocker_);
 683 }
 684
 685 // Run a Check_script task.
 686
 687 void
 688 Check_script::run(Workqueue*)
 689 {
 690   Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
 691   gold_assert(incremental_inputs != NULL);
 692   unsigned int arg_serial = this->input_reader_->arg_serial();
 693   Script_info* script_info =
 694       this->ibase_->get_script_info(this->input_file_index_);
 695   Timespec mtime = this->input_reader_->get_mtime();
 696   incremental_inputs->report_script(script_info, arg_serial, mtime);
 697 }
 698
 699 // Class Check_library.
 700
 701 Check_library::~Check_library()
 702 {
 703   if (this->this_blocker_ != NULL)
 704     delete this->this_blocker_;
 705   // next_blocker_ is deleted by the task associated with the next
 706   // input file.
 707 }
 708
 709 // Return whether a Check_library task is runnable.
 710
 711 Task_token*
 712 Check_library::is_runnable()
 713 {
 714   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 715     return this->this_blocker_;
 716   return NULL;
 717 }
 718
 719 void
 720 Check_library::locks(Task_locker* tl)
 721 {
 722   tl->add(this, this->next_blocker_);
 723 }
 724
 725 // Run a Check_library task.
 726
 727 void
 728 Check_library::run(Workqueue*)
 729 {
 730   Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
 731   gold_assert(incremental_inputs != NULL);
 732   Incremental_library* lib = this->ibase_->get_library(this->input_file_index_);
 733   gold_assert(lib != NULL);
 734   lib->copy_unused_symbols();
 735   // FIXME: Check that unused symbols remain unused.
 736   if (!lib->is_reported())
 737     {
 738       unsigned int lib_serial = lib->arg_serial();
 739       unsigned int lib_index = lib->input_file_index();
 740       Script_info* script_info = this->ibase_->get_script_info(lib_index);
 741       incremental_inputs->report_archive_begin(lib, lib_serial, script_info);
 742     }
 743   incremental_inputs->report_archive_end(lib);
 744 }
 745
 746 // Class Input_group.
 747
 748 // When we delete an Input_group we can delete the archive
 749 // information.
 750
 751 Input_group::~Input_group()
 752 {
 753   for (Input_group::const_iterator p = this->begin();
 754        p != this->end();
 755        ++p)
 756     delete *p;
 757 }
 758
 759 // Class Start_group.
 760
 761 Start_group::~Start_group()
 762 {
 763   if (this->this_blocker_ != NULL)
 764     delete this->this_blocker_;
 765   // next_blocker_ is deleted by the task associated with the first
 766   // file in the group.
 767 }
 768
 769 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
 770
 771 Task_token*
 772 Start_group::is_runnable()
 773 {
 774   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 775     return this->this_blocker_;
 776   return NULL;
 777 }
 778
 779 void
 780 Start_group::locks(Task_locker* tl)
 781 {
 782   tl->add(this, this->next_blocker_);
 783 }
 784
 785 // Store the number of undefined symbols we see now.
 786
 787 void
 788 Start_group::run(Workqueue*)
 789 {
 790   this->finish_group_->set_saw_undefined(this->symtab_->saw_undefined());
 791 }
 792
 793 // Class Finish_group.
 794
 795 Finish_group::~Finish_group()
 796 {
 797   if (this->this_blocker_ != NULL)
 798     delete this->this_blocker_;
 799   // next_blocker_ is deleted by the task associated with the next
 800   // input file following the group.
 801 }
 802
 803 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
 804
 805 Task_token*
 806 Finish_group::is_runnable()
 807 {
 808   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 809     return this->this_blocker_;
 810   return NULL;
 811 }
 812
 813 void
 814 Finish_group::locks(Task_locker* tl)
 815 {
 816   tl->add(this, this->next_blocker_);
 817 }
 818
 819 // Loop over the archives until there are no new undefined symbols.
 820
 821 void
 822 Finish_group::run(Workqueue*)
 823 {
 824   size_t saw_undefined = this->saw_undefined_;
 825   while (saw_undefined != this->symtab_->saw_undefined())
 826     {
 827       saw_undefined = this->symtab_->saw_undefined();
 828
 829       for (Input_group::const_iterator p = this->input_group_->begin();
 830            p != this->input_group_->end();
 831            ++p)
 832         {
 833           Task_lock_obj<Archive> tl(this, *p);
 834
 835           (*p)->add_symbols(this->symtab_, this->layout_,
 836                             this->input_objects_, this->mapfile_);
 837         }
 838     }
 839
 840   // Now that we're done with the archives, record the incremental
 841   // layout information.
 842   for (Input_group::const_iterator p = this->input_group_->begin();
 843        p != this->input_group_->end();
 844        ++p)
 845     {
 846       // For an incremental link, finish recording the layout information.
 847       Incremental_inputs* incremental_inputs =
 848           this->layout_->incremental_inputs();
 849       if (incremental_inputs != NULL)
 850         incremental_inputs->report_archive_end(*p);
 851     }
 852
 853   if (parameters->options().has_plugins())
 854     parameters->options().plugins()->save_input_group(this->input_group_);
 855   else
 856     delete this->input_group_;
 857 }
 858
 859 // Class Read_script
 860
 861 Read_script::~Read_script()
 862 {
 863   if (this->this_blocker_ != NULL)
 864     delete this->this_blocker_;
 865   // next_blocker_ is deleted by the task associated with the next
 866   // input file.
 867 }
 868
 869 // We are blocked by this_blocker_.
 870
 871 Task_token*
 872 Read_script::is_runnable()
 873 {
 874   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 875     return this->this_blocker_;
 876   return NULL;
 877 }
 878
 879 // We don't unlock next_blocker_ here.  If the script names any input
 880 // files, then the last file will be responsible for unlocking it.
 881
 882 void
 883 Read_script::locks(Task_locker*)
 884 {
 885 }
 886
 887 // Read the script, if it is a script.
 888
 889 void
 890 Read_script::run(Workqueue* workqueue)
 891 {
 892   bool used_next_blocker;
 893   if (!read_input_script(workqueue, this->symtab_, this->layout_,
 894                          this->dirpath_, this->dirindex_, this->input_objects_,
 895                          this->mapfile_, this->input_group_,
 896                          this->input_argument_, this->input_file_,
 897                          this->next_blocker_, &used_next_blocker))
 898     {
 899       // Here we have to handle any other input file types we need.
 900       gold_error(_("%s: not an object or archive"),
 901                  this->input_file_->file().filename().c_str());
 902     }
 903
 904   if (!used_next_blocker)
 905     {
 906       // Queue up a task to unlock next_blocker.  We can't just unlock
 907       // it here, as we don't hold the workqueue lock.
 908       workqueue->queue_soon(new Unblock_token(NULL, this->next_blocker_));
 909     }
 910 }
 911
 912 // Return a debugging name for a Read_script task.
 913
 914 std::string
 915 Read_script::get_name() const
 916 {
 917   std::string ret("Read_script ");
 918   if (this->input_argument_->file().is_lib())
 919     ret += "-l";
 920   else if (this->input_argument_->file().is_searched_file())
 921     ret += "-l:";
 922   ret += this->input_argument_->file().name();
 923   return ret;
 924 }
 925
 926 } // End namespace gold.