gold/plugin.cc

   1 // plugin.cc -- plugin manager for gold      -*- C++ -*-
   2
   3 // Copyright 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   4 // Written by Cary Coutant <ccoutant@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 <cstdio>
  26 #include <cstdarg>
  27 #include <cstring>
  28 #include <string>
  29 #include <vector>
  30
  31 #ifdef ENABLE_PLUGINS
  32 #include <dlfcn.h>
  33 #endif
  34
  35 #include "parameters.h"
  36 #include "errors.h"
  37 #include "fileread.h"
  38 #include "layout.h"
  39 #include "options.h"
  40 #include "plugin.h"
  41 #include "target.h"
  42 #include "readsyms.h"
  43 #include "symtab.h"
  44 #include "elfcpp.h"
  45
  46 namespace gold
  47 {
  48
  49 #ifdef ENABLE_PLUGINS
  50
  51 // The linker's exported interfaces.
  52
  53 extern "C"
  54 {
  55
  56 static enum ld_plugin_status
  57 register_claim_file(ld_plugin_claim_file_handler handler);
  58
  59 static enum ld_plugin_status
  60 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler);
  61
  62 static enum ld_plugin_status
  63 register_cleanup(ld_plugin_cleanup_handler handler);
  64
  65 static enum ld_plugin_status
  66 add_symbols(void *handle, int nsyms, const struct ld_plugin_symbol *syms);
  67
  68 static enum ld_plugin_status
  69 get_input_file(const void *handle, struct ld_plugin_input_file *file);
  70
  71 static enum ld_plugin_status
  72 get_view(const void *handle, const void **viewp);
  73
  74 static enum ld_plugin_status
  75 release_input_file(const void *handle);
  76
  77 static enum ld_plugin_status
  78 get_symbols(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
  79
  80 static enum ld_plugin_status
  81 get_symbols_v2(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
  82
  83 static enum ld_plugin_status
  84 add_input_file(const char *pathname);
  85
  86 static enum ld_plugin_status
  87 add_input_library(const char *pathname);
  88
  89 static enum ld_plugin_status
  90 set_extra_library_path(const char *path);
  91
  92 static enum ld_plugin_status
  93 message(int level, const char *format, ...);
  94
  95 static enum ld_plugin_status
  96 get_input_section_count(const void* handle, unsigned int* count);
  97
  98 static enum ld_plugin_status
  99 get_input_section_type(const struct ld_plugin_section section,
 100                        unsigned int* type);
 101
 102 static enum ld_plugin_status
 103 get_input_section_name(const struct ld_plugin_section section,
 104                        char** section_name_ptr);
 105
 106 static enum ld_plugin_status
 107 get_input_section_contents(const struct ld_plugin_section section,
 108                            const unsigned char** section_contents,
 109                            size_t* len);
 110
 111 static enum ld_plugin_status
 112 update_section_order(const struct ld_plugin_section *section_list,
 113                      unsigned int num_sections);
 114
 115 static enum ld_plugin_status
 116 allow_section_ordering();
 117
 118 };
 119
 120 #endif // ENABLE_PLUGINS
 121
 122 static Pluginobj* make_sized_plugin_object(Input_file* input_file,
 123                                            off_t offset, off_t filesize);
 124
 125 // Plugin methods.
 126
 127 // Load one plugin library.
 128
 129 void
 130 Plugin::load()
 131 {
 132 #ifdef ENABLE_PLUGINS
 133   // Load the plugin library.
 134   // FIXME: Look for the library in standard locations.
 135   this->handle_ = dlopen(this->filename_.c_str(), RTLD_NOW);
 136   if (this->handle_ == NULL)
 137     {
 138       gold_error(_("%s: could not load plugin library: %s"),
 139                  this->filename_.c_str(), dlerror());
 140       return;
 141     }
 142
 143   // Find the plugin's onload entry point.
 144   void* ptr = dlsym(this->handle_, "onload");
 145   if (ptr == NULL)
 146     {
 147       gold_error(_("%s: could not find onload entry point"),
 148                  this->filename_.c_str());
 149       return;
 150     }
 151   ld_plugin_onload onload;
 152   gold_assert(sizeof(onload) == sizeof(ptr));
 153   memcpy(&onload, &ptr, sizeof(ptr));
 154
 155   // Get the linker's version number.
 156   const char* ver = get_version_string();
 157   int major = 0;
 158   int minor = 0;
 159   sscanf(ver, "%d.%d", &major, &minor);
 160
 161   // Allocate and populate a transfer vector.
 162   const int tv_fixed_size = 24;
 163
 164   int tv_size = this->args_.size() + tv_fixed_size;
 165   ld_plugin_tv* tv = new ld_plugin_tv[tv_size];
 166
 167   // Put LDPT_MESSAGE at the front of the list so the plugin can use it
 168   // while processing subsequent entries.
 169   int i = 0;
 170   tv[i].tv_tag = LDPT_MESSAGE;
 171   tv[i].tv_u.tv_message = message;
 172
 173   ++i;
 174   tv[i].tv_tag = LDPT_API_VERSION;
 175   tv[i].tv_u.tv_val = LD_PLUGIN_API_VERSION;
 176
 177   ++i;
 178   tv[i].tv_tag = LDPT_GOLD_VERSION;
 179   tv[i].tv_u.tv_val = major * 100 + minor;
 180
 181   ++i;
 182   tv[i].tv_tag = LDPT_LINKER_OUTPUT;
 183   if (parameters->options().relocatable())
 184     tv[i].tv_u.tv_val = LDPO_REL;
 185   else if (parameters->options().shared())
 186     tv[i].tv_u.tv_val = LDPO_DYN;
 187   else
 188     tv[i].tv_u.tv_val = LDPO_EXEC;
 189
 190   ++i;
 191   tv[i].tv_tag = LDPT_OUTPUT_NAME;
 192   tv[i].tv_u.tv_string = parameters->options().output();
 193
 194   for (unsigned int j = 0; j < this->args_.size(); ++j)
 195     {
 196       ++i;
 197       tv[i].tv_tag = LDPT_OPTION;
 198       tv[i].tv_u.tv_string = this->args_[j].c_str();
 199     }
 200
 201   ++i;
 202   tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
 203   tv[i].tv_u.tv_register_claim_file = register_claim_file;
 204
 205   ++i;
 206   tv[i].tv_tag = LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK;
 207   tv[i].tv_u.tv_register_all_symbols_read = register_all_symbols_read;
 208
 209   ++i;
 210   tv[i].tv_tag = LDPT_REGISTER_CLEANUP_HOOK;
 211   tv[i].tv_u.tv_register_cleanup = register_cleanup;
 212
 213   ++i;
 214   tv[i].tv_tag = LDPT_ADD_SYMBOLS;
 215   tv[i].tv_u.tv_add_symbols = add_symbols;
 216
 217   ++i;
 218   tv[i].tv_tag = LDPT_GET_INPUT_FILE;
 219   tv[i].tv_u.tv_get_input_file = get_input_file;
 220
 221   ++i;
 222   tv[i].tv_tag = LDPT_GET_VIEW;
 223   tv[i].tv_u.tv_get_view = get_view;
 224
 225   ++i;
 226   tv[i].tv_tag = LDPT_RELEASE_INPUT_FILE;
 227   tv[i].tv_u.tv_release_input_file = release_input_file;
 228
 229   ++i;
 230   tv[i].tv_tag = LDPT_GET_SYMBOLS;
 231   tv[i].tv_u.tv_get_symbols = get_symbols;
 232
 233   ++i;
 234   tv[i].tv_tag = LDPT_GET_SYMBOLS_V2;
 235   tv[i].tv_u.tv_get_symbols = get_symbols_v2;
 236
 237   ++i;
 238   tv[i].tv_tag = LDPT_ADD_INPUT_FILE;
 239   tv[i].tv_u.tv_add_input_file = add_input_file;
 240
 241   ++i;
 242   tv[i].tv_tag = LDPT_ADD_INPUT_LIBRARY;
 243   tv[i].tv_u.tv_add_input_library = add_input_library;
 244
 245   ++i;
 246   tv[i].tv_tag = LDPT_SET_EXTRA_LIBRARY_PATH;
 247   tv[i].tv_u.tv_set_extra_library_path = set_extra_library_path;
 248
 249   ++i;
 250   tv[i].tv_tag = LDPT_GET_INPUT_SECTION_COUNT;
 251   tv[i].tv_u.tv_get_input_section_count = get_input_section_count;
 252
 253   ++i;
 254   tv[i].tv_tag = LDPT_GET_INPUT_SECTION_TYPE;
 255   tv[i].tv_u.tv_get_input_section_type = get_input_section_type;
 256
 257   ++i;
 258   tv[i].tv_tag = LDPT_GET_INPUT_SECTION_NAME;
 259   tv[i].tv_u.tv_get_input_section_name = get_input_section_name;
 260
 261   ++i;
 262   tv[i].tv_tag = LDPT_GET_INPUT_SECTION_CONTENTS;
 263   tv[i].tv_u.tv_get_input_section_contents = get_input_section_contents;
 264
 265   ++i;
 266   tv[i].tv_tag = LDPT_UPDATE_SECTION_ORDER;
 267   tv[i].tv_u.tv_update_section_order = update_section_order;
 268
 269   ++i;
 270   tv[i].tv_tag = LDPT_ALLOW_SECTION_ORDERING;
 271   tv[i].tv_u.tv_allow_section_ordering = allow_section_ordering;
 272
 273   ++i;
 274   tv[i].tv_tag = LDPT_NULL;
 275   tv[i].tv_u.tv_val = 0;
 276
 277   gold_assert(i == tv_size - 1);
 278
 279   // Call the onload entry point.
 280   (*onload)(tv);
 281
 282   delete[] tv;
 283 #endif // ENABLE_PLUGINS
 284 }
 285
 286 // Call the plugin claim-file handler.
 287
 288 inline bool
 289 Plugin::claim_file(struct ld_plugin_input_file* plugin_input_file)
 290 {
 291   int claimed = 0;
 292
 293   if (this->claim_file_handler_ != NULL)
 294     {
 295       (*this->claim_file_handler_)(plugin_input_file, &claimed);
 296       if (claimed)
 297         return true;
 298     }
 299   return false;
 300 }
 301
 302 // Call the all-symbols-read handler.
 303
 304 inline void
 305 Plugin::all_symbols_read()
 306 {
 307   if (this->all_symbols_read_handler_ != NULL)
 308     (*this->all_symbols_read_handler_)();
 309 }
 310
 311 // Call the cleanup handler.
 312
 313 inline void
 314 Plugin::cleanup()
 315 {
 316   if (this->cleanup_handler_ != NULL && !this->cleanup_done_)
 317     {
 318       // Set this flag before calling to prevent a recursive plunge
 319       // in the event that a plugin's cleanup handler issues a
 320       // fatal error.
 321       this->cleanup_done_ = true;
 322       (*this->cleanup_handler_)();
 323     }
 324 }
 325
 326 // This task is used to rescan archives as needed.
 327
 328 class Plugin_rescan : public Task
 329 {
 330  public:
 331   Plugin_rescan(Task_token* this_blocker, Task_token* next_blocker)
 332     : this_blocker_(this_blocker), next_blocker_(next_blocker)
 333   { }
 334
 335   ~Plugin_rescan()
 336   {
 337     delete this->this_blocker_;
 338   }
 339
 340   Task_token*
 341   is_runnable()
 342   {
 343     if (this->this_blocker_->is_blocked())
 344       return this->this_blocker_;
 345     return NULL;
 346   }
 347
 348   void
 349   locks(Task_locker* tl)
 350   { tl->add(this, this->next_blocker_); }
 351
 352   void
 353   run(Workqueue*)
 354   { parameters->options().plugins()->rescan(this); }
 355
 356   std::string
 357   get_name() const
 358   { return "Plugin_rescan"; }
 359
 360  private:
 361   Task_token* this_blocker_;
 362   Task_token* next_blocker_;
 363 };
 364
 365 // Plugin_manager methods.
 366
 367 Plugin_manager::~Plugin_manager()
 368 {
 369   for (Plugin_list::iterator p = this->plugins_.begin();
 370        p != this->plugins_.end();
 371        ++p)
 372     delete *p;
 373   this->plugins_.clear();
 374   for (Object_list::iterator obj = this->objects_.begin();
 375        obj != this->objects_.end();
 376        ++obj)
 377     delete *obj;
 378   this->objects_.clear();
 379 }
 380
 381 // Load all plugin libraries.
 382
 383 void
 384 Plugin_manager::load_plugins(Layout* layout)
 385 {
 386   this->layout_ = layout;
 387   for (this->current_ = this->plugins_.begin();
 388        this->current_ != this->plugins_.end();
 389        ++this->current_)
 390     (*this->current_)->load();
 391 }
 392
 393 // Call the plugin claim-file handlers in turn to see if any claim the file.
 394
 395 Pluginobj*
 396 Plugin_manager::claim_file(Input_file* input_file, off_t offset,
 397                            off_t filesize, Object* elf_object)
 398 {
 399   if (this->in_replacement_phase_)
 400     return NULL;
 401
 402   unsigned int handle = this->objects_.size();
 403   this->input_file_ = input_file;
 404   this->plugin_input_file_.name = input_file->filename().c_str();
 405   this->plugin_input_file_.fd = input_file->file().descriptor();
 406   this->plugin_input_file_.offset = offset;
 407   this->plugin_input_file_.filesize = filesize;
 408   this->plugin_input_file_.handle = reinterpret_cast<void*>(handle);
 409   if (elf_object != NULL)
 410     this->objects_.push_back(elf_object);
 411   this->in_claim_file_handler_ = true;
 412
 413   for (this->current_ = this->plugins_.begin();
 414        this->current_ != this->plugins_.end();
 415        ++this->current_)
 416     {
 417       if ((*this->current_)->claim_file(&this->plugin_input_file_))
 418         {
 419           this->any_claimed_ = true;
 420           this->in_claim_file_handler_ = false;
 421
 422           if (this->objects_.size() > handle
 423               && this->objects_[handle]->pluginobj() != NULL)
 424             return this->objects_[handle]->pluginobj();
 425
 426           // If the plugin claimed the file but did not call the
 427           // add_symbols callback, we need to create the Pluginobj now.
 428           Pluginobj* obj = this->make_plugin_object(handle);
 429           return obj;
 430         }
 431     }
 432
 433   this->in_claim_file_handler_ = false;
 434   return NULL;
 435 }
 436
 437 // Save an archive.  This is used so that a plugin can add a file
 438 // which refers to a symbol which was not previously referenced.  In
 439 // that case we want to pretend that the symbol was referenced before,
 440 // and pull in the archive object.
 441
 442 void
 443 Plugin_manager::save_archive(Archive* archive)
 444 {
 445   if (this->in_replacement_phase_ || !this->any_claimed_)
 446     delete archive;
 447   else
 448     this->rescannable_.push_back(Rescannable(archive));
 449 }
 450
 451 // Save an Input_group.  This is like save_archive.
 452
 453 void
 454 Plugin_manager::save_input_group(Input_group* input_group)
 455 {
 456   if (this->in_replacement_phase_ || !this->any_claimed_)
 457     delete input_group;
 458   else
 459     this->rescannable_.push_back(Rescannable(input_group));
 460 }
 461
 462 // Call the all-symbols-read handlers.
 463
 464 void
 465 Plugin_manager::all_symbols_read(Workqueue* workqueue, Task* task,
 466                                  Input_objects* input_objects,
 467                                  Symbol_table* symtab,
 468                                  Dirsearch* dirpath, Mapfile* mapfile,
 469                                  Task_token** last_blocker)
 470 {
 471   this->in_replacement_phase_ = true;
 472   this->workqueue_ = workqueue;
 473   this->task_ = task;
 474   this->input_objects_ = input_objects;
 475   this->symtab_ = symtab;
 476   this->dirpath_ = dirpath;
 477   this->mapfile_ = mapfile;
 478   this->this_blocker_ = NULL;
 479
 480   for (this->current_ = this->plugins_.begin();
 481        this->current_ != this->plugins_.end();
 482        ++this->current_)
 483     (*this->current_)->all_symbols_read();
 484
 485   if (this->any_added_)
 486     {
 487       Task_token* next_blocker = new Task_token(true);
 488       next_blocker->add_blocker();
 489       workqueue->queue(new Plugin_rescan(this->this_blocker_, next_blocker));
 490       this->this_blocker_ = next_blocker;
 491     }
 492
 493   *last_blocker = this->this_blocker_;
 494 }
 495
 496 // This is called when we see a new undefined symbol.  If we are in
 497 // the replacement phase, this means that we may need to rescan some
 498 // archives we have previously seen.
 499
 500 void
 501 Plugin_manager::new_undefined_symbol(Symbol* sym)
 502 {
 503   if (this->in_replacement_phase_)
 504     this->undefined_symbols_.push_back(sym);
 505 }
 506
 507 // Rescan archives as needed.  This handles the case where a new
 508 // object file added by a plugin has an undefined reference to some
 509 // symbol defined in an archive.
 510
 511 void
 512 Plugin_manager::rescan(Task* task)
 513 {
 514   size_t rescan_pos = 0;
 515   size_t rescan_size = this->rescannable_.size();
 516   while (!this->undefined_symbols_.empty())
 517     {
 518       if (rescan_pos >= rescan_size)
 519         {
 520           this->undefined_symbols_.clear();
 521           return;
 522         }
 523
 524       Undefined_symbol_list undefs;
 525       undefs.reserve(this->undefined_symbols_.size());
 526       this->undefined_symbols_.swap(undefs);
 527
 528       size_t min_rescan_pos = rescan_size;
 529
 530       for (Undefined_symbol_list::const_iterator p = undefs.begin();
 531            p != undefs.end();
 532            ++p)
 533         {
 534           if (!(*p)->is_undefined())
 535             continue;
 536
 537           this->undefined_symbols_.push_back(*p);
 538
 539           // Find the first rescan archive which defines this symbol,
 540           // starting at the current rescan position.  The rescan position
 541           // exists so that given -la -lb -lc we don't look for undefined
 542           // symbols in -lb back in -la, but instead get the definition
 543           // from -lc.  Don't bother to look past the current minimum
 544           // rescan position.
 545           for (size_t i = rescan_pos; i < min_rescan_pos; ++i)
 546             {
 547               if (this->rescannable_defines(i, *p))
 548                 {
 549                   min_rescan_pos = i;
 550                   break;
 551                 }
 552             }
 553         }
 554
 555       if (min_rescan_pos >= rescan_size)
 556         {
 557           // We didn't find any rescannable archives which define any
 558           // undefined symbols.
 559           return;
 560         }
 561
 562       const Rescannable& r(this->rescannable_[min_rescan_pos]);
 563       if (r.is_archive)
 564         {
 565           Task_lock_obj<Archive> tl(task, r.u.archive);
 566           r.u.archive->add_symbols(this->symtab_, this->layout_,
 567                                    this->input_objects_, this->mapfile_);
 568         }
 569       else
 570         {
 571           size_t next_saw_undefined = this->symtab_->saw_undefined();
 572           size_t saw_undefined;
 573           do
 574             {
 575               saw_undefined = next_saw_undefined;
 576
 577               for (Input_group::const_iterator p = r.u.input_group->begin();
 578                    p != r.u.input_group->end();
 579                    ++p)
 580                 {
 581                   Task_lock_obj<Archive> tl(task, *p);
 582
 583                   (*p)->add_symbols(this->symtab_, this->layout_,
 584                                     this->input_objects_, this->mapfile_);
 585                 }
 586
 587               next_saw_undefined = this->symtab_->saw_undefined();
 588             }
 589           while (saw_undefined != next_saw_undefined);
 590         }
 591
 592       for (size_t i = rescan_pos; i < min_rescan_pos + 1; ++i)
 593         {
 594           if (this->rescannable_[i].is_archive)
 595             delete this->rescannable_[i].u.archive;
 596           else
 597             delete this->rescannable_[i].u.input_group;
 598         }
 599
 600       rescan_pos = min_rescan_pos + 1;
 601     }
 602 }
 603
 604 // Return whether the rescannable at index I defines SYM.
 605
 606 bool
 607 Plugin_manager::rescannable_defines(size_t i, Symbol* sym)
 608 {
 609   const Rescannable& r(this->rescannable_[i]);
 610   if (r.is_archive)
 611     return r.u.archive->defines_symbol(sym);
 612   else
 613     {
 614       for (Input_group::const_iterator p = r.u.input_group->begin();
 615            p != r.u.input_group->end();
 616            ++p)
 617         {
 618           if ((*p)->defines_symbol(sym))
 619             return true;
 620         }
 621       return false;
 622     }
 623 }
 624
 625 // Layout deferred objects.
 626
 627 void
 628 Plugin_manager::layout_deferred_objects()
 629 {
 630   Deferred_layout_list::iterator obj;
 631
 632   for (obj = this->deferred_layout_objects_.begin();
 633        obj != this->deferred_layout_objects_.end();
 634        ++obj)
 635     {
 636       // Lock the object so we can read from it.  This is only called
 637       // single-threaded from queue_middle_tasks, so it is OK to lock.
 638       // Unfortunately we have no way to pass in a Task token.
 639       const Task* dummy_task = reinterpret_cast<const Task*>(-1);
 640       Task_lock_obj<Object> tl(dummy_task, *obj);
 641       (*obj)->layout_deferred_sections(this->layout_);
 642     }
 643 }
 644
 645 // Call the cleanup handlers.
 646
 647 void
 648 Plugin_manager::cleanup()
 649 {
 650   for (this->current_ = this->plugins_.begin();
 651        this->current_ != this->plugins_.end();
 652        ++this->current_)
 653     (*this->current_)->cleanup();
 654 }
 655
 656 // Make a new Pluginobj object.  This is called when the plugin calls
 657 // the add_symbols API.
 658
 659 Pluginobj*
 660 Plugin_manager::make_plugin_object(unsigned int handle)
 661 {
 662   // Make sure we aren't asked to make an object for the same handle twice.
 663   if (this->objects_.size() != handle
 664       && this->objects_[handle]->pluginobj() != NULL)
 665     return NULL;
 666
 667   Pluginobj* obj = make_sized_plugin_object(this->input_file_,
 668                                             this->plugin_input_file_.offset,
 669                                             this->plugin_input_file_.filesize);
 670
 671
 672   // If the elf object for this file was pushed into the objects_ vector, delete
 673   // it to make room for the Pluginobj as this file is claimed.
 674   if (this->objects_.size() != handle)
 675     this->objects_.pop_back();
 676
 677   this->objects_.push_back(obj);
 678   return obj;
 679 }
 680
 681 // Get the input file information with an open (possibly re-opened)
 682 // file descriptor.
 683
 684 ld_plugin_status
 685 Plugin_manager::get_input_file(unsigned int handle,
 686                                struct ld_plugin_input_file* file)
 687 {
 688   Pluginobj* obj = this->object(handle)->pluginobj();
 689   if (obj == NULL)
 690     return LDPS_BAD_HANDLE;
 691
 692   obj->lock(this->task_);
 693   file->name = obj->filename().c_str();
 694   file->fd = obj->descriptor();
 695   file->offset = obj->offset();
 696   file->filesize = obj->filesize();
 697   file->handle = reinterpret_cast<void*>(handle);
 698   return LDPS_OK;
 699 }
 700
 701 // Release the input file.
 702
 703 ld_plugin_status
 704 Plugin_manager::release_input_file(unsigned int handle)
 705 {
 706   if (this->object(handle) == NULL)
 707     return LDPS_BAD_HANDLE;
 708
 709   Pluginobj* obj = this->object(handle)->pluginobj();
 710
 711   if (obj == NULL)
 712     return LDPS_BAD_HANDLE;
 713
 714   obj->unlock(this->task_);
 715   return LDPS_OK;
 716 }
 717
 718 // Get the elf object corresponding to the handle. Return NULL if we
 719 // found a Pluginobj instead.
 720
 721 Object*
 722 Plugin_manager::get_elf_object(const void* handle)
 723 {
 724   Object* obj = this->object(
 725       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
 726
 727   // The object should not be a Pluginobj.
 728   if (obj == NULL
 729       || obj->pluginobj() != NULL)
 730     return NULL;
 731
 732   return obj;
 733 }
 734
 735 ld_plugin_status
 736 Plugin_manager::get_view(unsigned int handle, const void **viewp)
 737 {
 738   off_t offset;
 739   size_t filesize;
 740   Input_file *input_file;
 741   if (this->in_claim_file_handler_)
 742     {
 743       // We are being called from the claim_file hook.
 744       const struct ld_plugin_input_file &f = this->plugin_input_file_;
 745       offset = f.offset;
 746       filesize = f.filesize;
 747       input_file = this->input_file_;
 748     }
 749   else
 750     {
 751       // An already claimed file.
 752       if (this->object(handle) == NULL)
 753         return LDPS_BAD_HANDLE;
 754       Pluginobj* obj = this->object(handle)->pluginobj();
 755       if (obj == NULL)
 756         return LDPS_BAD_HANDLE;
 757       offset = obj->offset();
 758       filesize = obj->filesize();
 759       input_file = obj->input_file();
 760     }
 761   *viewp = (void*) input_file->file().get_view(offset, 0, filesize, false,
 762                                                false);
 763   return LDPS_OK;
 764 }
 765
 766 // Add a new library path.
 767
 768 ld_plugin_status
 769 Plugin_manager::set_extra_library_path(const char* path)
 770 {
 771   this->extra_search_path_ = std::string(path);
 772   return LDPS_OK;
 773 }
 774
 775 // Add a new input file.
 776
 777 ld_plugin_status
 778 Plugin_manager::add_input_file(const char* pathname, bool is_lib)
 779 {
 780   Input_file_argument file(pathname,
 781                            (is_lib
 782                             ? Input_file_argument::INPUT_FILE_TYPE_LIBRARY
 783                             : Input_file_argument::INPUT_FILE_TYPE_FILE),
 784                            (is_lib
 785                             ? this->extra_search_path_.c_str()
 786                             : ""),
 787                            false,
 788                            this->options_);
 789   Input_argument* input_argument = new Input_argument(file);
 790   Task_token* next_blocker = new Task_token(true);
 791   next_blocker->add_blocker();
 792   if (parameters->incremental())
 793     gold_error(_("input files added by plug-ins in --incremental mode not "
 794                  "supported yet"));
 795   this->workqueue_->queue_soon(new Read_symbols(this->input_objects_,
 796                                                 this->symtab_,
 797                                                 this->layout_,
 798                                                 this->dirpath_,
 799                                                 0,
 800                                                 this->mapfile_,
 801                                                 input_argument,
 802                                                 NULL,
 803                                                 NULL,
 804                                                 this->this_blocker_,
 805                                                 next_blocker));
 806   this->this_blocker_ = next_blocker;
 807   this->any_added_ = true;
 808   return LDPS_OK;
 809 }
 810
 811 // Class Pluginobj.
 812
 813 Pluginobj::Pluginobj(const std::string& name, Input_file* input_file,
 814                      off_t offset, off_t filesize)
 815   : Object(name, input_file, false, offset),
 816     nsyms_(0), syms_(NULL), symbols_(), filesize_(filesize), comdat_map_()
 817 {
 818 }
 819
 820 // Return TRUE if a defined symbol is referenced from outside the
 821 // universe of claimed objects.
 822
 823 static inline bool
 824 is_referenced_from_outside(Symbol* lsym)
 825 {
 826   if (lsym->in_real_elf())
 827     return true;
 828   if (parameters->options().relocatable())
 829     return true;
 830   if (parameters->options().is_undefined(lsym->name()))
 831     return true;
 832   return false;
 833 }
 834
 835 // Return TRUE if a defined symbol might be reachable from outside the
 836 // load module.
 837
 838 static inline bool
 839 is_visible_from_outside(Symbol* lsym)
 840 {
 841   if (parameters->options().export_dynamic() || parameters->options().shared())
 842     return lsym->is_externally_visible();
 843   return false;
 844 }
 845
 846 // Get symbol resolution info.
 847
 848 ld_plugin_status
 849 Pluginobj::get_symbol_resolution_info(int nsyms,
 850                                       ld_plugin_symbol* syms,
 851                                       int version) const
 852 {
 853   // For version 1 of this interface, we cannot use
 854   // LDPR_PREVAILING_DEF_IRONLY_EXP, so we return LDPR_PREVAILING_DEF
 855   // instead.
 856   const ld_plugin_symbol_resolution ldpr_prevailing_def_ironly_exp
 857       = (version > 1
 858          ? LDPR_PREVAILING_DEF_IRONLY_EXP
 859          : LDPR_PREVAILING_DEF);
 860
 861   if (nsyms > this->nsyms_)
 862     return LDPS_NO_SYMS;
 863
 864   if (static_cast<size_t>(nsyms) > this->symbols_.size())
 865     {
 866       // We never decided to include this object. We mark all symbols as
 867       // preempted.
 868       gold_assert(this->symbols_.size() == 0);
 869       for (int i = 0; i < nsyms; i++)
 870         syms[i].resolution = LDPR_PREEMPTED_REG;
 871       return LDPS_OK;
 872     }
 873
 874   for (int i = 0; i < nsyms; i++)
 875     {
 876       ld_plugin_symbol* isym = &syms[i];
 877       Symbol* lsym = this->symbols_[i];
 878       ld_plugin_symbol_resolution res = LDPR_UNKNOWN;
 879
 880       if (lsym->is_undefined())
 881         // The symbol remains undefined.
 882         res = LDPR_UNDEF;
 883       else if (isym->def == LDPK_UNDEF
 884                || isym->def == LDPK_WEAKUNDEF
 885                || isym->def == LDPK_COMMON)
 886         {
 887           // The original symbol was undefined or common.
 888           if (lsym->source() != Symbol::FROM_OBJECT)
 889             res = LDPR_RESOLVED_EXEC;
 890           else if (lsym->object()->pluginobj() == this)
 891             {
 892               if (is_referenced_from_outside(lsym))
 893                 res = LDPR_PREVAILING_DEF;
 894               else if (is_visible_from_outside(lsym))
 895                 res = ldpr_prevailing_def_ironly_exp;
 896               else
 897                 res = LDPR_PREVAILING_DEF_IRONLY;
 898             }
 899           else if (lsym->object()->pluginobj() != NULL)
 900             res = LDPR_RESOLVED_IR;
 901           else if (lsym->object()->is_dynamic())
 902             res = LDPR_RESOLVED_DYN;
 903           else
 904             res = LDPR_RESOLVED_EXEC;
 905         }
 906       else
 907         {
 908           // The original symbol was a definition.
 909           if (lsym->source() != Symbol::FROM_OBJECT)
 910             res = LDPR_PREEMPTED_REG;
 911           else if (lsym->object() == static_cast<const Object*>(this))
 912             {
 913               if (is_referenced_from_outside(lsym))
 914                 res = LDPR_PREVAILING_DEF;
 915               else if (is_visible_from_outside(lsym))
 916                 res = ldpr_prevailing_def_ironly_exp;
 917               else
 918                 res = LDPR_PREVAILING_DEF_IRONLY;
 919             }
 920           else
 921             res = (lsym->object()->pluginobj() != NULL
 922                    ? LDPR_PREEMPTED_IR
 923                    : LDPR_PREEMPTED_REG);
 924         }
 925       isym->resolution = res;
 926     }
 927   return LDPS_OK;
 928 }
 929
 930 // Return TRUE if the comdat group with key COMDAT_KEY from this object
 931 // should be kept.
 932
 933 bool
 934 Pluginobj::include_comdat_group(std::string comdat_key, Layout* layout)
 935 {
 936   std::pair<Comdat_map::iterator, bool> ins =
 937     this->comdat_map_.insert(std::make_pair(comdat_key, false));
 938
 939   // If this is the first time we've seen this comdat key, ask the
 940   // layout object whether it should be included.
 941   if (ins.second)
 942     ins.first->second = layout->find_or_add_kept_section(comdat_key,
 943                                                          NULL, 0, true,
 944                                                          true, NULL);
 945
 946   return ins.first->second;
 947 }
 948
 949 // Class Sized_pluginobj.
 950
 951 template<int size, bool big_endian>
 952 Sized_pluginobj<size, big_endian>::Sized_pluginobj(
 953     const std::string& name,
 954     Input_file* input_file,
 955     off_t offset,
 956     off_t filesize)
 957   : Pluginobj(name, input_file, offset, filesize)
 958 {
 959 }
 960
 961 // Read the symbols.  Not used for plugin objects.
 962
 963 template<int size, bool big_endian>
 964 void
 965 Sized_pluginobj<size, big_endian>::do_read_symbols(Read_symbols_data*)
 966 {
 967   gold_unreachable();
 968 }
 969
 970 // Lay out the input sections.  Not used for plugin objects.
 971
 972 template<int size, bool big_endian>
 973 void
 974 Sized_pluginobj<size, big_endian>::do_layout(Symbol_table*, Layout*,
 975                                              Read_symbols_data*)
 976 {
 977   gold_unreachable();
 978 }
 979
 980 // Add the symbols to the symbol table.
 981
 982 template<int size, bool big_endian>
 983 void
 984 Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
 985                                                   Read_symbols_data*,
 986                                                   Layout* layout)
 987 {
 988   const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 989   unsigned char symbuf[sym_size];
 990   elfcpp::Sym<size, big_endian> sym(symbuf);
 991   elfcpp::Sym_write<size, big_endian> osym(symbuf);
 992
 993   typedef typename elfcpp::Elf_types<size>::Elf_WXword Elf_size_type;
 994
 995   this->symbols_.resize(this->nsyms_);
 996
 997   for (int i = 0; i < this->nsyms_; ++i)
 998     {
 999       const struct ld_plugin_symbol* isym = &this->syms_[i];
1000       const char* name = isym->name;
1001       const char* ver = isym->version;
1002       elfcpp::Elf_Half shndx;
1003       elfcpp::STB bind;
1004       elfcpp::STV vis;
1005
1006       if (name != NULL && name[0] == '\0')
1007         name = NULL;
1008       if (ver != NULL && ver[0] == '\0')
1009         ver = NULL;
1010
1011       switch (isym->def)
1012         {
1013         case LDPK_WEAKDEF:
1014         case LDPK_WEAKUNDEF:
1015           bind = elfcpp::STB_WEAK;
1016           break;
1017         case LDPK_DEF:
1018         case LDPK_UNDEF:
1019         case LDPK_COMMON:
1020         default:
1021           bind = elfcpp::STB_GLOBAL;
1022           break;
1023         }
1024
1025       switch (isym->def)
1026         {
1027         case LDPK_DEF:
1028         case LDPK_WEAKDEF:
1029           shndx = elfcpp::SHN_ABS;
1030           break;
1031         case LDPK_COMMON:
1032           shndx = elfcpp::SHN_COMMON;
1033           break;
1034         case LDPK_UNDEF:
1035         case LDPK_WEAKUNDEF:
1036         default:
1037           shndx = elfcpp::SHN_UNDEF;
1038           break;
1039         }
1040
1041       switch (isym->visibility)
1042         {
1043         case LDPV_PROTECTED:
1044           vis = elfcpp::STV_PROTECTED;
1045           break;
1046         case LDPV_INTERNAL:
1047           vis = elfcpp::STV_INTERNAL;
1048           break;
1049         case LDPV_HIDDEN:
1050           vis = elfcpp::STV_HIDDEN;
1051           break;
1052         case LDPV_DEFAULT:
1053         default:
1054           vis = elfcpp::STV_DEFAULT;
1055           break;
1056         }
1057
1058       if (isym->comdat_key != NULL
1059           && isym->comdat_key[0] != '\0'
1060           && !this->include_comdat_group(isym->comdat_key, layout))
1061         shndx = elfcpp::SHN_UNDEF;
1062
1063       osym.put_st_name(0);
1064       osym.put_st_value(0);
1065       osym.put_st_size(static_cast<Elf_size_type>(isym->size));
1066       osym.put_st_info(bind, elfcpp::STT_NOTYPE);
1067       osym.put_st_other(vis, 0);
1068       osym.put_st_shndx(shndx);
1069
1070       this->symbols_[i] =
1071         symtab->add_from_pluginobj<size, big_endian>(this, name, ver, &sym);
1072     }
1073 }
1074
1075 template<int size, bool big_endian>
1076 Archive::Should_include
1077 Sized_pluginobj<size, big_endian>::do_should_include_member(
1078     Symbol_table* symtab,
1079     Layout* layout,
1080     Read_symbols_data*,
1081     std::string* why)
1082 {
1083   char* tmpbuf = NULL;
1084   size_t tmpbuflen = 0;
1085
1086   for (int i = 0; i < this->nsyms_; ++i)
1087     {
1088       const struct ld_plugin_symbol& sym = this->syms_[i];
1089       const char* name = sym.name;
1090       Symbol* symbol;
1091       Archive::Should_include t = Archive::should_include_member(symtab,
1092                                                                  layout,
1093                                                                  name,
1094                                                                  &symbol, why,
1095                                                                  &tmpbuf,
1096                                                                  &tmpbuflen);
1097       if (t == Archive::SHOULD_INCLUDE_YES)
1098         {
1099           if (tmpbuf != NULL)
1100             free(tmpbuf);
1101           return t;
1102         }
1103     }
1104   if (tmpbuf != NULL)
1105     free(tmpbuf);
1106   return Archive::SHOULD_INCLUDE_UNKNOWN;
1107 }
1108
1109 // Iterate over global symbols, calling a visitor class V for each.
1110
1111 template<int size, bool big_endian>
1112 void
1113 Sized_pluginobj<size, big_endian>::do_for_all_global_symbols(
1114     Read_symbols_data*,
1115     Library_base::Symbol_visitor_base* v)
1116 {
1117   for (int i = 0; i < this->nsyms_; ++i)
1118     {
1119       const struct ld_plugin_symbol& sym = this->syms_[i];
1120       if (sym.def != LDPK_UNDEF)
1121         v->visit(sym.name);
1122     }
1123 }
1124
1125 // Iterate over local symbols, calling a visitor class V for each GOT offset
1126 // associated with a local symbol.
1127 template<int size, bool big_endian>
1128 void
1129 Sized_pluginobj<size, big_endian>::do_for_all_local_got_entries(
1130     Got_offset_list::Visitor*) const
1131 {
1132   gold_unreachable();
1133 }
1134
1135 // Get the size of a section.  Not used for plugin objects.
1136
1137 template<int size, bool big_endian>
1138 uint64_t
1139 Sized_pluginobj<size, big_endian>::do_section_size(unsigned int)
1140 {
1141   gold_unreachable();
1142   return 0;
1143 }
1144
1145 // Get the name of a section.  Not used for plugin objects.
1146
1147 template<int size, bool big_endian>
1148 std::string
1149 Sized_pluginobj<size, big_endian>::do_section_name(unsigned int)
1150 {
1151   gold_unreachable();
1152   return std::string();
1153 }
1154
1155 // Return a view of the contents of a section.  Not used for plugin objects.
1156
1157 template<int size, bool big_endian>
1158 Object::Location
1159 Sized_pluginobj<size, big_endian>::do_section_contents(unsigned int)
1160 {
1161   Location loc(0, 0);
1162
1163   gold_unreachable();
1164   return loc;
1165 }
1166
1167 // Return section flags.  Not used for plugin objects.
1168
1169 template<int size, bool big_endian>
1170 uint64_t
1171 Sized_pluginobj<size, big_endian>::do_section_flags(unsigned int)
1172 {
1173   gold_unreachable();
1174   return 0;
1175 }
1176
1177 // Return section entsize.  Not used for plugin objects.
1178
1179 template<int size, bool big_endian>
1180 uint64_t
1181 Sized_pluginobj<size, big_endian>::do_section_entsize(unsigned int)
1182 {
1183   gold_unreachable();
1184   return 0;
1185 }
1186
1187 // Return section address.  Not used for plugin objects.
1188
1189 template<int size, bool big_endian>
1190 uint64_t
1191 Sized_pluginobj<size, big_endian>::do_section_address(unsigned int)
1192 {
1193   gold_unreachable();
1194   return 0;
1195 }
1196
1197 // Return section type.  Not used for plugin objects.
1198
1199 template<int size, bool big_endian>
1200 unsigned int
1201 Sized_pluginobj<size, big_endian>::do_section_type(unsigned int)
1202 {
1203   gold_unreachable();
1204   return 0;
1205 }
1206
1207 // Return the section link field.  Not used for plugin objects.
1208
1209 template<int size, bool big_endian>
1210 unsigned int
1211 Sized_pluginobj<size, big_endian>::do_section_link(unsigned int)
1212 {
1213   gold_unreachable();
1214   return 0;
1215 }
1216
1217 // Return the section link field.  Not used for plugin objects.
1218
1219 template<int size, bool big_endian>
1220 unsigned int
1221 Sized_pluginobj<size, big_endian>::do_section_info(unsigned int)
1222 {
1223   gold_unreachable();
1224   return 0;
1225 }
1226
1227 // Return the section alignment.  Not used for plugin objects.
1228
1229 template<int size, bool big_endian>
1230 uint64_t
1231 Sized_pluginobj<size, big_endian>::do_section_addralign(unsigned int)
1232 {
1233   gold_unreachable();
1234   return 0;
1235 }
1236
1237 // Return the Xindex structure to use.  Not used for plugin objects.
1238
1239 template<int size, bool big_endian>
1240 Xindex*
1241 Sized_pluginobj<size, big_endian>::do_initialize_xindex()
1242 {
1243   gold_unreachable();
1244   return NULL;
1245 }
1246
1247 // Get symbol counts.  Don't count plugin objects; the replacement
1248 // files will provide the counts.
1249
1250 template<int size, bool big_endian>
1251 void
1252 Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(
1253     const Symbol_table*,
1254     size_t* defined,
1255     size_t* used) const
1256 {
1257   *defined = 0;
1258   *used = 0;
1259 }
1260
1261 // Get symbols.  Not used for plugin objects.
1262
1263 template<int size, bool big_endian>
1264 const Object::Symbols*
1265 Sized_pluginobj<size, big_endian>::do_get_global_symbols() const
1266 {
1267   gold_unreachable();
1268 }
1269
1270 // Class Plugin_finish.  This task runs after all replacement files have
1271 // been added.  For now, it's a placeholder for a possible plugin API
1272 // to allow the plugin to release most of its resources.  The cleanup
1273 // handlers must be called later, because they can remove the temporary
1274 // object files that are needed until the end of the link.
1275
1276 class Plugin_finish : public Task
1277 {
1278  public:
1279   Plugin_finish(Task_token* this_blocker, Task_token* next_blocker)
1280     : this_blocker_(this_blocker), next_blocker_(next_blocker)
1281   { }
1282
1283   ~Plugin_finish()
1284   {
1285     if (this->this_blocker_ != NULL)
1286       delete this->this_blocker_;
1287   }
1288
1289   Task_token*
1290   is_runnable()
1291   {
1292     if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
1293       return this->this_blocker_;
1294     return NULL;
1295   }
1296
1297   void
1298   locks(Task_locker* tl)
1299   { tl->add(this, this->next_blocker_); }
1300
1301   void
1302   run(Workqueue*)
1303   {
1304     // We could call early cleanup handlers here.
1305   }
1306
1307   std::string
1308   get_name() const
1309   { return "Plugin_finish"; }
1310
1311  private:
1312   Task_token* this_blocker_;
1313   Task_token* next_blocker_;
1314 };
1315
1316 // Class Plugin_hook.
1317
1318 Plugin_hook::~Plugin_hook()
1319 {
1320 }
1321
1322 // Return whether a Plugin_hook task is runnable.
1323
1324 Task_token*
1325 Plugin_hook::is_runnable()
1326 {
1327   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
1328     return this->this_blocker_;
1329   return NULL;
1330 }
1331
1332 // Return a Task_locker for a Plugin_hook task.  We don't need any
1333 // locks here.
1334
1335 void
1336 Plugin_hook::locks(Task_locker*)
1337 {
1338 }
1339
1340 // Run the "all symbols read" plugin hook.
1341
1342 void
1343 Plugin_hook::run(Workqueue* workqueue)
1344 {
1345   gold_assert(this->options_.has_plugins());
1346   Symbol* start_sym = this->symtab_->lookup(parameters->entry());
1347   if (start_sym != NULL)
1348     start_sym->set_in_real_elf();
1349
1350   this->options_.plugins()->all_symbols_read(workqueue,
1351                                              this,
1352                                              this->input_objects_,
1353                                              this->symtab_,
1354                                              this->dirpath_,
1355                                              this->mapfile_,
1356                                              &this->this_blocker_);
1357   workqueue->queue_soon(new Plugin_finish(this->this_blocker_,
1358                                           this->next_blocker_));
1359 }
1360
1361 // The C interface routines called by the plugins.
1362
1363 #ifdef ENABLE_PLUGINS
1364
1365 // Register a claim-file handler.
1366
1367 static enum ld_plugin_status
1368 register_claim_file(ld_plugin_claim_file_handler handler)
1369 {
1370   gold_assert(parameters->options().has_plugins());
1371   parameters->options().plugins()->set_claim_file_handler(handler);
1372   return LDPS_OK;
1373 }
1374
1375 // Register an all-symbols-read handler.
1376
1377 static enum ld_plugin_status
1378 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler)
1379 {
1380   gold_assert(parameters->options().has_plugins());
1381   parameters->options().plugins()->set_all_symbols_read_handler(handler);
1382   return LDPS_OK;
1383 }
1384
1385 // Register a cleanup handler.
1386
1387 static enum ld_plugin_status
1388 register_cleanup(ld_plugin_cleanup_handler handler)
1389 {
1390   gold_assert(parameters->options().has_plugins());
1391   parameters->options().plugins()->set_cleanup_handler(handler);
1392   return LDPS_OK;
1393 }
1394
1395 // Add symbols from a plugin-claimed input file.
1396
1397 static enum ld_plugin_status
1398 add_symbols(void* handle, int nsyms, const ld_plugin_symbol* syms)
1399 {
1400   gold_assert(parameters->options().has_plugins());
1401   Pluginobj* obj = parameters->options().plugins()->make_plugin_object(
1402       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
1403   if (obj == NULL)
1404     return LDPS_ERR;
1405   obj->store_incoming_symbols(nsyms, syms);
1406   return LDPS_OK;
1407 }
1408
1409 // Get the input file information with an open (possibly re-opened)
1410 // file descriptor.
1411
1412 static enum ld_plugin_status
1413 get_input_file(const void* handle, struct ld_plugin_input_file* file)
1414 {
1415   gold_assert(parameters->options().has_plugins());
1416   unsigned int obj_index =
1417       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
1418   return parameters->options().plugins()->get_input_file(obj_index, file);
1419 }
1420
1421 // Release the input file.
1422
1423 static enum ld_plugin_status
1424 release_input_file(const void* handle)
1425 {
1426   gold_assert(parameters->options().has_plugins());
1427   unsigned int obj_index =
1428       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
1429   return parameters->options().plugins()->release_input_file(obj_index);
1430 }
1431
1432 static enum ld_plugin_status
1433 get_view(const void *handle, const void **viewp)
1434 {
1435   gold_assert(parameters->options().has_plugins());
1436   unsigned int obj_index =
1437       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
1438   return parameters->options().plugins()->get_view(obj_index, viewp);
1439 }
1440
1441 // Get the symbol resolution info for a plugin-claimed input file.
1442
1443 static enum ld_plugin_status
1444 get_symbols(const void* handle, int nsyms, ld_plugin_symbol* syms)
1445 {
1446   gold_assert(parameters->options().has_plugins());
1447   Object* obj = parameters->options().plugins()->object(
1448     static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
1449   if (obj == NULL)
1450     return LDPS_ERR;
1451   Pluginobj* plugin_obj = obj->pluginobj();
1452   if (plugin_obj == NULL)
1453     return LDPS_ERR;
1454   return plugin_obj->get_symbol_resolution_info(nsyms, syms, 1);
1455 }
1456
1457 // Version 2 of the above.  The only difference is that this version
1458 // is allowed to return the resolution code LDPR_PREVAILING_DEF_IRONLY_EXP.
1459
1460 static enum ld_plugin_status
1461 get_symbols_v2(const void* handle, int nsyms, ld_plugin_symbol* syms)
1462 {
1463   gold_assert(parameters->options().has_plugins());
1464   Object* obj = parameters->options().plugins()->object(
1465     static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
1466   if (obj == NULL)
1467     return LDPS_ERR;
1468   Pluginobj* plugin_obj = obj->pluginobj();
1469   if (plugin_obj == NULL)
1470     return LDPS_ERR;
1471   return plugin_obj->get_symbol_resolution_info(nsyms, syms, 2);
1472 }
1473
1474 // Add a new (real) input file generated by a plugin.
1475
1476 static enum ld_plugin_status
1477 add_input_file(const char* pathname)
1478 {
1479   gold_assert(parameters->options().has_plugins());
1480   return parameters->options().plugins()->add_input_file(pathname, false);
1481 }
1482
1483 // Add a new (real) library required by a plugin.
1484
1485 static enum ld_plugin_status
1486 add_input_library(const char* pathname)
1487 {
1488   gold_assert(parameters->options().has_plugins());
1489   return parameters->options().plugins()->add_input_file(pathname, true);
1490 }
1491
1492 // Set the extra library path to be used by libraries added via
1493 // add_input_library
1494
1495 static enum ld_plugin_status
1496 set_extra_library_path(const char* path)
1497 {
1498   gold_assert(parameters->options().has_plugins());
1499   return parameters->options().plugins()->set_extra_library_path(path);
1500 }
1501
1502 // Issue a diagnostic message from a plugin.
1503
1504 static enum ld_plugin_status
1505 message(int level, const char* format, ...)
1506 {
1507   va_list args;
1508   va_start(args, format);
1509
1510   switch (level)
1511     {
1512     case LDPL_INFO:
1513       parameters->errors()->info(format, args);
1514       break;
1515     case LDPL_WARNING:
1516       parameters->errors()->warning(format, args);
1517       break;
1518     case LDPL_ERROR:
1519     default:
1520       parameters->errors()->error(format, args);
1521       break;
1522     case LDPL_FATAL:
1523       parameters->errors()->fatal(format, args);
1524       break;
1525     }
1526
1527   va_end(args);
1528   return LDPS_OK;
1529 }
1530
1531 // Get the section count of the object corresponding to the handle.  This
1532 // plugin interface can only be called in the claim_file handler of the plugin.
1533
1534 static enum ld_plugin_status
1535 get_input_section_count(const void* handle, unsigned int* count)
1536 {
1537   gold_assert(parameters->options().has_plugins());
1538
1539   if (!parameters->options().plugins()->in_claim_file_handler())
1540     return LDPS_ERR;
1541
1542   Object* obj = parameters->options().plugins()->get_elf_object(handle);
1543
1544   if (obj == NULL)
1545     return LDPS_ERR;
1546
1547   *count = obj->shnum();
1548   return LDPS_OK;
1549 }
1550
1551 // Get the type of the specified section in the object corresponding
1552 // to the handle.  This plugin interface can only be called in the
1553 // claim_file handler of the plugin.
1554
1555 static enum ld_plugin_status
1556 get_input_section_type(const struct ld_plugin_section section,
1557                        unsigned int* type)
1558 {
1559   gold_assert(parameters->options().has_plugins());
1560
1561   if (!parameters->options().plugins()->in_claim_file_handler())
1562     return LDPS_ERR;
1563
1564   Object* obj
1565     = parameters->options().plugins()->get_elf_object(section.handle);
1566
1567   if (obj == NULL)
1568     return LDPS_BAD_HANDLE;
1569
1570   *type = obj->section_type(section.shndx);
1571   return LDPS_OK;
1572 }
1573
1574 // Get the name of the specified section in the object corresponding
1575 // to the handle.  This plugin interface can only be called in the
1576 // claim_file handler of the plugin.
1577
1578 static enum ld_plugin_status
1579 get_input_section_name(const struct ld_plugin_section section,
1580                        char** section_name_ptr)
1581 {
1582   gold_assert(parameters->options().has_plugins());
1583
1584   if (!parameters->options().plugins()->in_claim_file_handler())
1585     return LDPS_ERR;
1586
1587   Object* obj
1588     = parameters->options().plugins()->get_elf_object(section.handle);
1589
1590   if (obj == NULL)
1591     return LDPS_BAD_HANDLE;
1592
1593   // Check if the object is locked before getting the section name.
1594   gold_assert(obj->is_locked());
1595
1596   const std::string section_name = obj->section_name(section.shndx);
1597   *section_name_ptr = static_cast<char*>(malloc(section_name.length() + 1));
1598   memcpy(*section_name_ptr, section_name.c_str(), section_name.length() + 1);
1599   return LDPS_OK;
1600 }
1601
1602 // Get the contents of the specified section in the object corresponding
1603 // to the handle.  This plugin interface can only be called in the
1604 // claim_file handler of the plugin.
1605
1606 static enum ld_plugin_status
1607 get_input_section_contents(const struct ld_plugin_section section,
1608                            const unsigned char** section_contents_ptr,
1609                            size_t* len)
1610 {
1611   gold_assert(parameters->options().has_plugins());
1612
1613   if (!parameters->options().plugins()->in_claim_file_handler())
1614     return LDPS_ERR;
1615
1616   Object* obj
1617     = parameters->options().plugins()->get_elf_object(section.handle);
1618
1619   if (obj == NULL)
1620     return LDPS_BAD_HANDLE;
1621
1622   // Check if the object is locked before getting the section contents.
1623   gold_assert(obj->is_locked());
1624
1625   section_size_type plen;
1626   *section_contents_ptr
1627       = obj->section_contents(section.shndx, &plen, false);
1628   *len = plen;
1629   return LDPS_OK;
1630 }
1631
1632 // Specify the ordering of sections in the final layout. The sections are
1633 // specified as (handle,shndx) pairs in the two arrays in the order in
1634 // which they should appear in the final layout.
1635
1636 static enum ld_plugin_status
1637 update_section_order(const struct ld_plugin_section* section_list,
1638                      unsigned int num_sections)
1639 {
1640   gold_assert(parameters->options().has_plugins());
1641
1642   if (num_sections == 0)
1643     return LDPS_OK;
1644
1645   if (section_list == NULL)
1646     return LDPS_ERR;
1647
1648   Layout* layout = parameters->options().plugins()->layout();
1649   gold_assert (layout != NULL);
1650
1651   std::map<Section_id, unsigned int>* order_map
1652     = layout->get_section_order_map();
1653
1654   /* Store the mapping from Section_id to section position in layout's
1655      order_map to consult after output sections are added.  */
1656   for (unsigned int i = 0; i < num_sections; ++i)
1657     {
1658       Object* obj = parameters->options().plugins()->get_elf_object(
1659           section_list[i].handle);
1660       if (obj == NULL)
1661         return LDPS_BAD_HANDLE;
1662       unsigned int shndx = section_list[i].shndx;
1663       Section_id secn_id(obj, shndx);
1664       (*order_map)[secn_id] = i + 1;
1665     }
1666
1667   return LDPS_OK;
1668 }
1669
1670 // Let the linker know that the sections could be reordered.
1671
1672 static enum ld_plugin_status
1673 allow_section_ordering()
1674 {
1675   gold_assert(parameters->options().has_plugins());
1676   Layout* layout = parameters->options().plugins()->layout();
1677   layout->set_section_ordering_specified();
1678   return LDPS_OK;
1679 }
1680
1681 #endif // ENABLE_PLUGINS
1682
1683 // Allocate a Pluginobj object of the appropriate size and endianness.
1684
1685 static Pluginobj*
1686 make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize)
1687 {
1688   Pluginobj* obj = NULL;
1689
1690   parameters_force_valid_target();
1691   const Target& target(parameters->target());
1692
1693   if (target.get_size() == 32)
1694     {
1695       if (target.is_big_endian())
1696 #ifdef HAVE_TARGET_32_BIG
1697         obj = new Sized_pluginobj<32, true>(input_file->filename(),
1698                                             input_file, offset, filesize);
1699 #else
1700         gold_error(_("%s: not configured to support "
1701                      "32-bit big-endian object"),
1702                    input_file->filename().c_str());
1703 #endif
1704       else
1705 #ifdef HAVE_TARGET_32_LITTLE
1706         obj = new Sized_pluginobj<32, false>(input_file->filename(),
1707                                              input_file, offset, filesize);
1708 #else
1709         gold_error(_("%s: not configured to support "
1710                      "32-bit little-endian object"),
1711                    input_file->filename().c_str());
1712 #endif
1713     }
1714   else if (target.get_size() == 64)
1715     {
1716       if (target.is_big_endian())
1717 #ifdef HAVE_TARGET_64_BIG
1718         obj = new Sized_pluginobj<64, true>(input_file->filename(),
1719                                             input_file, offset, filesize);
1720 #else
1721         gold_error(_("%s: not configured to support "
1722                      "64-bit big-endian object"),
1723                    input_file->filename().c_str());
1724 #endif
1725       else
1726 #ifdef HAVE_TARGET_64_LITTLE
1727         obj = new Sized_pluginobj<64, false>(input_file->filename(),
1728                                              input_file, offset, filesize);
1729 #else
1730         gold_error(_("%s: not configured to support "
1731                      "64-bit little-endian object"),
1732                    input_file->filename().c_str());
1733 #endif
1734     }
1735
1736   gold_assert(obj != NULL);
1737   return obj;
1738 }
1739
1740 } // End namespace gold.