contrib/binutils-2.21/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 then collecting statisticts, 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                                                 this->this_blocker_,
 352                                                 this->next_blocker_));
 353           return true;
 354         }
 355     }
 356
 357   if (is_elf)
 358     {
 359       // This is an ELF object.
 360
 361       bool unconfigured = false;
 362       bool* punconfigured = (input_file->will_search_for()
 363                              ? &unconfigured
 364                              : NULL);
 365       Object* obj = make_elf_object(input_file->filename(),
 366                                     input_file, 0, ehdr, read_size,
 367                                     punconfigured);
 368       if (obj == NULL)
 369         {
 370           if (unconfigured)
 371             {
 372               Read_symbols::incompatible_warning(this->input_argument_,
 373                                                  input_file);
 374               input_file->file().release();
 375               input_file->file().unlock(this);
 376               delete input_file;
 377               ++this->dirindex_;
 378               return this->do_read_symbols(workqueue);
 379             }
 380           return false;
 381         }
 382
 383       Read_symbols_data* sd = new Read_symbols_data;
 384       obj->read_symbols(sd);
 385
 386       // Opening the file locked it, so now we need to unlock it.  We
 387       // need to unlock it before queuing the Add_symbols task,
 388       // because the workqueue doesn't know about our lock on the
 389       // file.  If we queue the Add_symbols task first, it will be
 390       // stuck on the end of the file lock, but since the workqueue
 391       // doesn't know about that lock, it will never release the
 392       // Add_symbols task.
 393
 394       input_file->file().unlock(this);
 395
 396       if (this->member_ != NULL)
 397         {
 398           this->member_->sd_ = sd;
 399           this->member_->obj_ = obj;
 400           return true;
 401         }
 402
 403       // We use queue_next because everything is cached for this
 404       // task to run right away if possible.
 405
 406       workqueue->queue_next(new Add_symbols(this->input_objects_,
 407                                             this->symtab_, this->layout_,
 408                                             this->dirpath_,
 409                                             this->dirindex_,
 410                                             this->mapfile_,
 411                                             this->input_argument_,
 412                                             obj,
 413                                             sd,
 414                                             this->this_blocker_,
 415                                             this->next_blocker_));
 416
 417       return true;
 418     }
 419
 420   // Queue up a task to try to parse this file as a script.  We use a
 421   // separate task so that the script will be read in order with other
 422   // objects named on the command line.  Also so that we don't try to
 423   // read multiple scripts simultaneously, which could lead to
 424   // unpredictable changes to the General_options structure.
 425
 426   workqueue->queue_soon(new Read_script(this->symtab_,
 427                                         this->layout_,
 428                                         this->dirpath_,
 429                                         this->dirindex_,
 430                                         this->input_objects_,
 431                                         this->mapfile_,
 432                                         this->input_group_,
 433                                         this->input_argument_,
 434                                         input_file,
 435                                         this->this_blocker_,
 436                                         this->next_blocker_));
 437   return true;
 438 }
 439
 440 // Handle a group.  We need to walk through the arguments over and
 441 // over until we don't see any new undefined symbols.  We do this by
 442 // setting off Read_symbols Tasks as usual, but recording the archive
 443 // entries instead of deleting them.  We also start a Finish_group
 444 // Task which runs after we've read all the symbols.  In that task we
 445 // process the archives in a loop until we are done.
 446
 447 void
 448 Read_symbols::do_group(Workqueue* workqueue)
 449 {
 450   Input_group* input_group = new Input_group();
 451
 452   const Input_file_group* group = this->input_argument_->group();
 453   Task_token* this_blocker = this->this_blocker_;
 454
 455   Finish_group* finish_group = new Finish_group(this->input_objects_,
 456                                                 this->symtab_,
 457                                                 this->layout_,
 458                                                 this->mapfile_,
 459                                                 input_group,
 460                                                 this->next_blocker_);
 461
 462   Task_token* next_blocker = new Task_token(true);
 463   next_blocker->add_blocker();
 464   workqueue->queue_soon(new Start_group(this->symtab_, finish_group,
 465                                         this_blocker, next_blocker));
 466   this_blocker = next_blocker;
 467
 468   for (Input_file_group::const_iterator p = group->begin();
 469        p != group->end();
 470        ++p)
 471     {
 472       const Input_argument* arg = &*p;
 473       gold_assert(arg->is_file());
 474
 475       next_blocker = new Task_token(true);
 476       next_blocker->add_blocker();
 477       workqueue->queue_soon(new Read_symbols(this->input_objects_,
 478                                              this->symtab_, this->layout_,
 479                                              this->dirpath_, this->dirindex_,
 480                                              this->mapfile_, arg, input_group,
 481                                              NULL, this_blocker, next_blocker));
 482       this_blocker = next_blocker;
 483     }
 484
 485   finish_group->set_blocker(this_blocker);
 486
 487   workqueue->queue_soon(finish_group);
 488 }
 489
 490 // Return a debugging name for a Read_symbols task.
 491
 492 std::string
 493 Read_symbols::get_name() const
 494 {
 495   if (this->input_argument_->is_group())
 496     {
 497       std::string ret("Read_symbols group (");
 498       bool add_space = false;
 499       const Input_file_group* group = this->input_argument_->group();
 500       for (Input_file_group::const_iterator p = group->begin();
 501            p != group->end();
 502            ++p)
 503       {
 504         if (add_space)
 505           ret += ' ';
 506         ret += p->file().name();
 507         add_space = true;
 508       }
 509       return ret + ')';
 510     }
 511   else if (this->input_argument_->is_lib())
 512     {
 513       std::string ret("Read_symbols lib (");
 514       bool add_space = false;
 515       const Input_file_lib* lib = this->input_argument_->lib();
 516       for (Input_file_lib::const_iterator p = lib->begin();
 517            p != lib->end();
 518            ++p)
 519       {
 520         if (add_space)
 521           ret += ' ';
 522         ret += p->file().name();
 523         add_space = true;
 524       }
 525       return ret + ')';
 526     }
 527   else
 528     {
 529       std::string ret("Read_symbols ");
 530       if (this->input_argument_->file().is_lib())
 531         ret += "-l";
 532       else if (this->input_argument_->file().is_searched_file())
 533         ret += "-l:";
 534       ret += this->input_argument_->file().name();
 535       return ret;
 536     }
 537 }
 538
 539 // Class Add_symbols.
 540
 541 Add_symbols::~Add_symbols()
 542 {
 543   if (this->this_blocker_ != NULL)
 544     delete this->this_blocker_;
 545   // next_blocker_ is deleted by the task associated with the next
 546   // input file.
 547 }
 548
 549 // We are blocked by this_blocker_.  We block next_blocker_.  We also
 550 // lock the file.
 551
 552 Task_token*
 553 Add_symbols::is_runnable()
 554 {
 555   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 556     return this->this_blocker_;
 557   if (this->object_->is_locked())
 558     return this->object_->token();
 559   return NULL;
 560 }
 561
 562 void
 563 Add_symbols::locks(Task_locker* tl)
 564 {
 565   tl->add(this, this->next_blocker_);
 566   tl->add(this, this->object_->token());
 567 }
 568
 569 // Add the symbols in the object to the symbol table.
 570
 571 void
 572 Add_symbols::run(Workqueue*)
 573 {
 574   Pluginobj* pluginobj = this->object_->pluginobj();
 575   if (pluginobj != NULL)
 576     {
 577       this->object_->add_symbols(this->symtab_, this->sd_, this->layout_);
 578       return;
 579     }
 580
 581   if (!this->input_objects_->add_object(this->object_))
 582     {
 583       delete this->sd_;
 584       this->sd_ = NULL;
 585       this->object_->release();
 586       delete this->object_;
 587     }
 588   else
 589     {
 590       Incremental_inputs* incremental_inputs =
 591           this->layout_->incremental_inputs();
 592       if (incremental_inputs != NULL)
 593         incremental_inputs->report_object(this->object_, NULL);
 594       this->object_->layout(this->symtab_, this->layout_, this->sd_);
 595       this->object_->add_symbols(this->symtab_, this->sd_, this->layout_);
 596       delete this->sd_;
 597       this->sd_ = NULL;
 598       this->object_->release();
 599     }
 600 }
 601
 602 // Class Input_group.
 603
 604 // When we delete an Input_group we can delete the archive
 605 // information.
 606
 607 Input_group::~Input_group()
 608 {
 609   for (Input_group::const_iterator p = this->begin();
 610        p != this->end();
 611        ++p)
 612     delete *p;
 613 }
 614
 615 // Class Start_group.
 616
 617 Start_group::~Start_group()
 618 {
 619   if (this->this_blocker_ != NULL)
 620     delete this->this_blocker_;
 621   // next_blocker_ is deleted by the task associated with the first
 622   // file in the group.
 623 }
 624
 625 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
 626
 627 Task_token*
 628 Start_group::is_runnable()
 629 {
 630   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 631     return this->this_blocker_;
 632   return NULL;
 633 }
 634
 635 void
 636 Start_group::locks(Task_locker* tl)
 637 {
 638   tl->add(this, this->next_blocker_);
 639 }
 640
 641 // Store the number of undefined symbols we see now.
 642
 643 void
 644 Start_group::run(Workqueue*)
 645 {
 646   this->finish_group_->set_saw_undefined(this->symtab_->saw_undefined());
 647 }
 648
 649 // Class Finish_group.
 650
 651 Finish_group::~Finish_group()
 652 {
 653   if (this->this_blocker_ != NULL)
 654     delete this->this_blocker_;
 655   // next_blocker_ is deleted by the task associated with the next
 656   // input file following the group.
 657 }
 658
 659 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
 660
 661 Task_token*
 662 Finish_group::is_runnable()
 663 {
 664   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 665     return this->this_blocker_;
 666   return NULL;
 667 }
 668
 669 void
 670 Finish_group::locks(Task_locker* tl)
 671 {
 672   tl->add(this, this->next_blocker_);
 673 }
 674
 675 // Loop over the archives until there are no new undefined symbols.
 676
 677 void
 678 Finish_group::run(Workqueue*)
 679 {
 680   size_t saw_undefined = this->saw_undefined_;
 681   while (saw_undefined != this->symtab_->saw_undefined())
 682     {
 683       saw_undefined = this->symtab_->saw_undefined();
 684
 685       for (Input_group::const_iterator p = this->input_group_->begin();
 686            p != this->input_group_->end();
 687            ++p)
 688         {
 689           Task_lock_obj<Archive> tl(this, *p);
 690
 691           (*p)->add_symbols(this->symtab_, this->layout_,
 692                             this->input_objects_, this->mapfile_);
 693         }
 694     }
 695
 696   // Now that we're done with the archives, record the incremental
 697   // layout information.
 698   for (Input_group::const_iterator p = this->input_group_->begin();
 699        p != this->input_group_->end();
 700        ++p)
 701     {
 702       // For an incremental link, finish recording the layout information.
 703       Incremental_inputs* incremental_inputs =
 704           this->layout_->incremental_inputs();
 705       if (incremental_inputs != NULL)
 706         incremental_inputs->report_archive_end(*p);
 707     }
 708
 709   if (parameters->options().has_plugins())
 710     parameters->options().plugins()->save_input_group(this->input_group_);
 711   else
 712     delete this->input_group_;
 713 }
 714
 715 // Class Read_script
 716
 717 Read_script::~Read_script()
 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 // We are blocked by this_blocker_.
 726
 727 Task_token*
 728 Read_script::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 // We don't unlock next_blocker_ here.  If the script names any input
 736 // files, then the last file will be responsible for unlocking it.
 737
 738 void
 739 Read_script::locks(Task_locker*)
 740 {
 741 }
 742
 743 // Read the script, if it is a script.
 744
 745 void
 746 Read_script::run(Workqueue* workqueue)
 747 {
 748   bool used_next_blocker;
 749   if (!read_input_script(workqueue, this->symtab_, this->layout_,
 750                          this->dirpath_, this->dirindex_, this->input_objects_,
 751                          this->mapfile_, this->input_group_,
 752                          this->input_argument_, this->input_file_,
 753                          this->next_blocker_, &used_next_blocker))
 754     {
 755       // Here we have to handle any other input file types we need.
 756       gold_error(_("%s: not an object or archive"),
 757                  this->input_file_->file().filename().c_str());
 758     }
 759
 760   if (!used_next_blocker)
 761     {
 762       // Queue up a task to unlock next_blocker.  We can't just unlock
 763       // it here, as we don't hold the workqueue lock.
 764       workqueue->queue_soon(new Unblock_token(NULL, this->next_blocker_));
 765     }
 766 }
 767
 768 // Return a debugging name for a Read_script task.
 769
 770 std::string
 771 Read_script::get_name() const
 772 {
 773   std::string ret("Read_script ");
 774   if (this->input_argument_->file().is_lib())
 775     ret += "-l";
 776   else if (this->input_argument_->file().is_searched_file())
 777     ret += "-l:";
 778   ret += this->input_argument_->file().name();
 779   return ret;
 780 }
 781
 782 } // End namespace gold.