gold/plugin.cc

   1 // plugin.cc -- plugin manager for gold      -*- C++ -*-
   2
   3 // Copyright 2008, 2009 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 <cstdio>
  24 #include <cstdarg>
  25 #include <cstring>
  26 #include <string>
  27 #include <vector>
  28 #include <dlfcn.h>
  29
  30 #include "gold.h"
  31 #include "parameters.h"
  32 #include "errors.h"
  33 #include "fileread.h"
  34 #include "layout.h"
  35 #include "options.h"
  36 #include "plugin.h"
  37 #include "target.h"
  38 #include "readsyms.h"
  39 #include "symtab.h"
  40 #include "elfcpp.h"
  41
  42 namespace gold
  43 {
  44
  45 #ifdef ENABLE_PLUGINS
  46
  47 // The linker's exported interfaces.
  48
  49 extern "C"
  50 {
  51
  52 static enum ld_plugin_status
  53 register_claim_file(ld_plugin_claim_file_handler handler);
  54
  55 static enum ld_plugin_status
  56 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler);
  57
  58 static enum ld_plugin_status
  59 register_cleanup(ld_plugin_cleanup_handler handler);
  60
  61 static enum ld_plugin_status
  62 add_symbols(void *handle, int nsyms, const struct ld_plugin_symbol *syms);
  63
  64 static enum ld_plugin_status
  65 get_input_file(const void *handle, struct ld_plugin_input_file *file);
  66
  67 static enum ld_plugin_status
  68 release_input_file(const void *handle);
  69
  70 static enum ld_plugin_status
  71 get_symbols(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
  72
  73 static enum ld_plugin_status
  74 add_input_file(char *pathname);
  75
  76 static enum ld_plugin_status
  77 message(int level, const char *format, ...);
  78
  79 };
  80
  81 #endif // ENABLE_PLUGINS
  82
  83 static Pluginobj* make_sized_plugin_object(Input_file* input_file,
  84                                            off_t offset, off_t filesize);
  85
  86 // Plugin methods.
  87
  88 // Load one plugin library.
  89
  90 void
  91 Plugin::load()
  92 {
  93 #ifdef ENABLE_PLUGINS
  94   // Load the plugin library.
  95   // FIXME: Look for the library in standard locations.
  96   this->handle_ = dlopen(this->filename_.c_str(), RTLD_NOW);
  97   if (this->handle_ == NULL)
  98     {
  99       gold_error(_("%s: could not load plugin library"),
 100                  this->filename_.c_str());
 101       return;
 102     }
 103
 104   // Find the plugin's onload entry point.
 105   ld_plugin_onload onload = reinterpret_cast<ld_plugin_onload>
 106     (dlsym(this->handle_, "onload"));
 107   if (onload == NULL)
 108     {
 109       gold_error(_("%s: could not find onload entry point"),
 110                  this->filename_.c_str());
 111       return;
 112     }
 113
 114   // Get the linker's version number.
 115   const char* ver = get_version_string();
 116   int major = 0;
 117   int minor = 0;
 118   sscanf(ver, "%d.%d", &major, &minor);
 119
 120   // Allocate and populate a transfer vector.
 121   const int tv_fixed_size = 13;
 122   int tv_size = this->args_.size() + tv_fixed_size;
 123   ld_plugin_tv *tv = new ld_plugin_tv[tv_size];
 124
 125   // Put LDPT_MESSAGE at the front of the list so the plugin can use it
 126   // while processing subsequent entries.
 127   int i = 0;
 128   tv[i].tv_tag = LDPT_MESSAGE;
 129   tv[i].tv_u.tv_message = message;
 130
 131   ++i;
 132   tv[i].tv_tag = LDPT_API_VERSION;
 133   tv[i].tv_u.tv_val = LD_PLUGIN_API_VERSION;
 134
 135   ++i;
 136   tv[i].tv_tag = LDPT_GOLD_VERSION;
 137   tv[i].tv_u.tv_val = major * 100 + minor;
 138
 139   ++i;
 140   tv[i].tv_tag = LDPT_LINKER_OUTPUT;
 141   if (parameters->options().relocatable())
 142     tv[i].tv_u.tv_val = LDPO_REL;
 143   else if (parameters->options().shared())
 144     tv[i].tv_u.tv_val = LDPO_DYN;
 145   else
 146     tv[i].tv_u.tv_val = LDPO_EXEC;
 147
 148   for (unsigned int j = 0; j < this->args_.size(); ++j)
 149     {
 150       ++i;
 151       tv[i].tv_tag = LDPT_OPTION;
 152       tv[i].tv_u.tv_string = this->args_[j].c_str();
 153     }
 154
 155   ++i;
 156   tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
 157   tv[i].tv_u.tv_register_claim_file = register_claim_file;
 158
 159   ++i;
 160   tv[i].tv_tag = LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK;
 161   tv[i].tv_u.tv_register_all_symbols_read = register_all_symbols_read;
 162
 163   ++i;
 164   tv[i].tv_tag = LDPT_REGISTER_CLEANUP_HOOK;
 165   tv[i].tv_u.tv_register_cleanup = register_cleanup;
 166
 167   ++i;
 168   tv[i].tv_tag = LDPT_ADD_SYMBOLS;
 169   tv[i].tv_u.tv_add_symbols = add_symbols;
 170
 171   ++i;
 172   tv[i].tv_tag = LDPT_GET_INPUT_FILE;
 173   tv[i].tv_u.tv_get_input_file = get_input_file;
 174
 175   ++i;
 176   tv[i].tv_tag = LDPT_RELEASE_INPUT_FILE;
 177   tv[i].tv_u.tv_release_input_file = release_input_file;
 178
 179   ++i;
 180   tv[i].tv_tag = LDPT_GET_SYMBOLS;
 181   tv[i].tv_u.tv_get_symbols = get_symbols;
 182
 183   ++i;
 184   tv[i].tv_tag = LDPT_ADD_INPUT_FILE;
 185   tv[i].tv_u.tv_add_input_file = add_input_file;
 186
 187   ++i;
 188   tv[i].tv_tag = LDPT_NULL;
 189   tv[i].tv_u.tv_val = 0;
 190
 191   gold_assert(i == tv_size - 1);
 192
 193   // Call the onload entry point.
 194   (*onload)(tv);
 195
 196   delete[] tv;
 197 #endif // ENABLE_PLUGINS
 198 }
 199
 200 // Call the plugin claim-file handler.
 201
 202 inline bool
 203 Plugin::claim_file(struct ld_plugin_input_file *plugin_input_file)
 204 {
 205   int claimed = 0;
 206
 207   if (this->claim_file_handler_ != NULL)
 208     {
 209       (*this->claim_file_handler_)(plugin_input_file, &claimed);
 210       if (claimed)
 211         return true;
 212     }
 213   return false;
 214 }
 215
 216 // Call the all-symbols-read handler.
 217
 218 inline void
 219 Plugin::all_symbols_read()
 220 {
 221   if (this->all_symbols_read_handler_ != NULL)
 222     (*this->all_symbols_read_handler_)();
 223 }
 224
 225 // Call the cleanup handler.
 226
 227 inline void
 228 Plugin::cleanup()
 229 {
 230   if (this->cleanup_handler_ != NULL)
 231     (*this->cleanup_handler_)();
 232 }
 233
 234 // Plugin_manager methods.
 235
 236 Plugin_manager::~Plugin_manager()
 237 {
 238   for (Plugin_list::iterator p = this->plugins_.begin();
 239        p != this->plugins_.end();
 240        ++p)
 241     delete *p;
 242   this->plugins_.clear();
 243   for (Object_list::iterator obj = this->objects_.begin();
 244        obj != this->objects_.end();
 245        ++obj)
 246     delete *obj;
 247   this->objects_.clear();
 248 }
 249
 250 // Load all plugin libraries.
 251
 252 void
 253 Plugin_manager::load_plugins()
 254 {
 255   for (this->current_ = this->plugins_.begin();
 256        this->current_ != this->plugins_.end();
 257        ++this->current_)
 258     (*this->current_)->load();
 259 }
 260
 261 // Call the plugin claim-file handlers in turn to see if any claim the file.
 262
 263 Pluginobj*
 264 Plugin_manager::claim_file(Input_file* input_file, off_t offset,
 265                            off_t filesize)
 266 {
 267   if (this->in_replacement_phase_)
 268     return NULL;
 269
 270   unsigned int handle = this->objects_.size();
 271   this->input_file_ = input_file;
 272   this->plugin_input_file_.name = input_file->filename().c_str();
 273   this->plugin_input_file_.fd = input_file->file().descriptor();
 274   this->plugin_input_file_.offset = offset;
 275   this->plugin_input_file_.filesize = filesize;
 276   this->plugin_input_file_.handle = reinterpret_cast<void*>(handle);
 277
 278   for (this->current_ = this->plugins_.begin();
 279        this->current_ != this->plugins_.end();
 280        ++this->current_)
 281     {
 282       if ((*this->current_)->claim_file(&this->plugin_input_file_))
 283         {
 284           if (this->objects_.size() > handle)
 285             return this->objects_[handle];
 286
 287           // If the plugin claimed the file but did not call the
 288           // add_symbols callback, we need to create the Pluginobj now.
 289           Pluginobj* obj = this->make_plugin_object(handle);
 290           return obj;
 291         }
 292     }
 293
 294   return NULL;
 295 }
 296
 297 // Call the all-symbols-read handlers.
 298
 299 void
 300 Plugin_manager::all_symbols_read(Workqueue* workqueue, Task* task,
 301                                  Input_objects* input_objects,
 302                                  Symbol_table* symtab, Layout* layout,
 303                                  Dirsearch* dirpath, Mapfile* mapfile,
 304                                  Task_token** last_blocker)
 305 {
 306   this->in_replacement_phase_ = true;
 307   this->workqueue_ = workqueue;
 308   this->task_ = task;
 309   this->input_objects_ = input_objects;
 310   this->symtab_ = symtab;
 311   this->layout_ = layout;
 312   this->dirpath_ = dirpath;
 313   this->mapfile_ = mapfile;
 314   this->this_blocker_ = NULL;
 315
 316   for (this->current_ = this->plugins_.begin();
 317        this->current_ != this->plugins_.end();
 318        ++this->current_)
 319     (*this->current_)->all_symbols_read();
 320
 321   *last_blocker = this->this_blocker_;
 322 }
 323
 324 // Layout deferred objects.
 325
 326 void
 327 Plugin_manager::layout_deferred_objects()
 328 {
 329   Deferred_layout_list::iterator obj;
 330
 331   for (obj = this->deferred_layout_objects_.begin();
 332        obj != this->deferred_layout_objects_.end();
 333        ++obj)
 334     (*obj)->layout_deferred_sections(this->layout_);
 335 }
 336
 337 // Call the cleanup handlers.
 338
 339 void
 340 Plugin_manager::cleanup()
 341 {
 342   if (this->cleanup_done_)
 343     return;
 344   for (this->current_ = this->plugins_.begin();
 345        this->current_ != this->plugins_.end();
 346        ++this->current_)
 347     (*this->current_)->cleanup();
 348   this->cleanup_done_ = true;
 349 }
 350
 351 // Make a new Pluginobj object.  This is called when the plugin calls
 352 // the add_symbols API.
 353
 354 Pluginobj*
 355 Plugin_manager::make_plugin_object(unsigned int handle)
 356 {
 357   // Make sure we aren't asked to make an object for the same handle twice.
 358   if (this->objects_.size() != handle)
 359     return NULL;
 360
 361   Pluginobj* obj = make_sized_plugin_object(this->input_file_,
 362                                             this->plugin_input_file_.offset,
 363                                             this->plugin_input_file_.filesize);
 364   this->objects_.push_back(obj);
 365   return obj;
 366 }
 367
 368 // Get the input file information with an open (possibly re-opened)
 369 // file descriptor.
 370
 371 ld_plugin_status
 372 Plugin_manager::get_input_file(unsigned int handle,
 373                                struct ld_plugin_input_file *file)
 374 {
 375   Pluginobj* obj = this->object(handle);
 376   if (obj == NULL)
 377     return LDPS_BAD_HANDLE;
 378
 379   obj->lock(this->task_);
 380   file->name = obj->filename().c_str();
 381   file->fd = obj->descriptor();
 382   file->offset = obj->offset();
 383   file->filesize = obj->filesize();
 384   file->handle = reinterpret_cast<void*>(handle);
 385   return LDPS_OK;
 386 }
 387
 388 // Release the input file.
 389
 390 ld_plugin_status
 391 Plugin_manager::release_input_file(unsigned int handle)
 392 {
 393   Pluginobj* obj = this->object(handle);
 394   if (obj == NULL)
 395     return LDPS_BAD_HANDLE;
 396
 397   obj->unlock(this->task_);
 398   return LDPS_OK;
 399 }
 400
 401 // Add a new input file.
 402
 403 ld_plugin_status
 404 Plugin_manager::add_input_file(char *pathname)
 405 {
 406   Input_file_argument file(pathname, false, "", false, this->options_);
 407   Input_argument* input_argument = new Input_argument(file);
 408   Task_token* next_blocker = new Task_token(true);
 409   next_blocker->add_blocker();
 410   if (this->layout_->incremental_inputs())
 411     gold_error(_("Input files added by plug-ins in --incremental mode not "
 412                  "supported yet.\n"));
 413   this->workqueue_->queue_soon(new Read_symbols(this->input_objects_,
 414                                                 this->symtab_,
 415                                                 this->layout_,
 416                                                 this->dirpath_,
 417                                                 0,
 418                                                 this->mapfile_,
 419                                                 input_argument,
 420                                                 NULL,
 421                                                 this->this_blocker_,
 422                                                 next_blocker));
 423   this->this_blocker_ = next_blocker;
 424   return LDPS_OK;
 425 }
 426
 427 // Class Pluginobj.
 428
 429 Pluginobj::Pluginobj(const std::string& name, Input_file* input_file,
 430                      off_t offset, off_t filesize)
 431   : Object(name, input_file, false, offset),
 432     nsyms_(0), syms_(NULL), symbols_(), filesize_(filesize), comdat_map_()
 433 {
 434 }
 435
 436 // Return TRUE if a defined symbol might be reachable from outside the
 437 // universe of claimed objects.
 438
 439 static inline bool
 440 is_visible_from_outside(Symbol* lsym)
 441 {
 442   if (lsym->in_real_elf())
 443     return true;
 444   if (parameters->options().relocatable())
 445     return true;
 446   if (parameters->options().export_dynamic() || parameters->options().shared())
 447     return lsym->is_externally_visible();
 448   return false;
 449 }
 450
 451 // Get symbol resolution info.
 452
 453 ld_plugin_status
 454 Pluginobj::get_symbol_resolution_info(int nsyms, ld_plugin_symbol* syms) const
 455 {
 456   if (nsyms > this->nsyms_)
 457     return LDPS_NO_SYMS;
 458   for (int i = 0; i < nsyms; i++)
 459     {
 460       ld_plugin_symbol* isym = &syms[i];
 461       Symbol* lsym = this->symbols_[i];
 462       ld_plugin_symbol_resolution res = LDPR_UNKNOWN;
 463
 464       if (lsym->is_undefined())
 465         // The symbol remains undefined.
 466         res = LDPR_UNDEF;
 467       else if (isym->def == LDPK_UNDEF
 468                || isym->def == LDPK_WEAKUNDEF
 469                || isym->def == LDPK_COMMON)
 470         {
 471           // The original symbol was undefined or common.
 472           if (lsym->source() != Symbol::FROM_OBJECT)
 473             res = LDPR_RESOLVED_EXEC;
 474           else if (lsym->object()->pluginobj() != NULL)
 475             res = LDPR_RESOLVED_IR;
 476           else if (lsym->object()->is_dynamic())
 477             res = LDPR_RESOLVED_DYN;
 478           else
 479             res = LDPR_RESOLVED_EXEC;
 480         }
 481       else
 482         {
 483           // The original symbol was a definition.
 484           if (lsym->source() != Symbol::FROM_OBJECT)
 485             res = LDPR_PREEMPTED_REG;
 486           else if (lsym->object() == static_cast<const Object*>(this))
 487             res = (is_visible_from_outside(lsym)
 488                    ? LDPR_PREVAILING_DEF
 489                    : LDPR_PREVAILING_DEF_IRONLY);
 490           else
 491             res = (lsym->object()->pluginobj() != NULL
 492                    ? LDPR_PREEMPTED_IR
 493                    : LDPR_PREEMPTED_REG);
 494         }
 495       isym->resolution = res;
 496     }
 497   return LDPS_OK;
 498 }
 499
 500 // Return TRUE if the comdat group with key COMDAT_KEY from this object
 501 // should be kept.
 502
 503 bool
 504 Pluginobj::include_comdat_group(std::string comdat_key, Layout* layout)
 505 {
 506   std::pair<Comdat_map::iterator, bool> ins =
 507     this->comdat_map_.insert(std::make_pair(comdat_key, false));
 508
 509   // If this is the first time we've seen this comdat key, ask the
 510   // layout object whether it should be included.
 511   if (ins.second)
 512     ins.first->second = layout->find_or_add_kept_section(comdat_key,
 513                                                          NULL, 0, true,
 514                                                          true, NULL);
 515
 516   return ins.first->second;
 517 }
 518
 519 // Class Sized_pluginobj.
 520
 521 template<int size, bool big_endian>
 522 Sized_pluginobj<size, big_endian>::Sized_pluginobj(
 523     const std::string& name,
 524     Input_file* input_file,
 525     off_t offset,
 526     off_t filesize)
 527   : Pluginobj(name, input_file, offset, filesize)
 528 {
 529 }
 530
 531 // Read the symbols.  Not used for plugin objects.
 532
 533 template<int size, bool big_endian>
 534 void
 535 Sized_pluginobj<size, big_endian>::do_read_symbols(Read_symbols_data*)
 536 {
 537   gold_unreachable();
 538 }
 539
 540 // Lay out the input sections.  Not used for plugin objects.
 541
 542 template<int size, bool big_endian>
 543 void
 544 Sized_pluginobj<size, big_endian>::do_layout(Symbol_table*, Layout*,
 545                                              Read_symbols_data*)
 546 {
 547   gold_unreachable();
 548 }
 549
 550 // Add the symbols to the symbol table.
 551
 552 template<int size, bool big_endian>
 553 void
 554 Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
 555                                                   Read_symbols_data*,
 556                                                   Layout* layout)
 557 {
 558   const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 559   unsigned char symbuf[sym_size];
 560   elfcpp::Sym<size, big_endian> sym(symbuf);
 561   elfcpp::Sym_write<size, big_endian> osym(symbuf);
 562
 563   typedef typename elfcpp::Elf_types<size>::Elf_WXword Elf_size_type;
 564
 565   this->symbols_.resize(this->nsyms_);
 566
 567   for (int i = 0; i < this->nsyms_; ++i)
 568     {
 569       const struct ld_plugin_symbol *isym = &this->syms_[i];
 570       const char* name = isym->name;
 571       const char* ver = isym->version;
 572       elfcpp::Elf_Half shndx;
 573       elfcpp::STB bind;
 574       elfcpp::STV vis;
 575
 576       if (name != NULL && name[0] == '\0')
 577         name = NULL;
 578       if (ver != NULL && ver[0] == '\0')
 579         ver = NULL;
 580
 581       switch (isym->def)
 582         {
 583         case LDPK_WEAKDEF:
 584         case LDPK_WEAKUNDEF:
 585           bind = elfcpp::STB_WEAK;
 586           break;
 587         case LDPK_DEF:
 588         case LDPK_UNDEF:
 589         case LDPK_COMMON:
 590         default:
 591           bind = elfcpp::STB_GLOBAL;
 592           break;
 593         }
 594
 595       switch (isym->def)
 596         {
 597         case LDPK_DEF:
 598         case LDPK_WEAKDEF:
 599           shndx = elfcpp::SHN_ABS;
 600           break;
 601         case LDPK_COMMON:
 602           shndx = elfcpp::SHN_COMMON;
 603           break;
 604         case LDPK_UNDEF:
 605         case LDPK_WEAKUNDEF:
 606         default:
 607           shndx = elfcpp::SHN_UNDEF;
 608           break;
 609         }
 610
 611       switch (isym->visibility)
 612         {
 613         case LDPV_PROTECTED:
 614           vis = elfcpp::STV_DEFAULT;
 615           break;
 616         case LDPV_INTERNAL:
 617           vis = elfcpp::STV_DEFAULT;
 618           break;
 619         case LDPV_HIDDEN:
 620           vis = elfcpp::STV_DEFAULT;
 621           break;
 622         case LDPV_DEFAULT:
 623         default:
 624           vis = elfcpp::STV_DEFAULT;
 625           break;
 626         }
 627
 628       if (isym->comdat_key != NULL
 629           && isym->comdat_key[0] != '\0'
 630           && !this->include_comdat_group(isym->comdat_key, layout))
 631         shndx = elfcpp::SHN_UNDEF;
 632
 633       osym.put_st_name(0);
 634       osym.put_st_value(0);
 635       osym.put_st_size(static_cast<Elf_size_type>(isym->size));
 636       osym.put_st_info(bind, elfcpp::STT_NOTYPE);
 637       osym.put_st_other(vis, 0);
 638       osym.put_st_shndx(shndx);
 639
 640       this->symbols_[i] =
 641         symtab->add_from_pluginobj<size, big_endian>(this, name, ver, &sym);
 642     }
 643 }
 644
 645 // Get the size of a section.  Not used for plugin objects.
 646
 647 template<int size, bool big_endian>
 648 uint64_t
 649 Sized_pluginobj<size, big_endian>::do_section_size(unsigned int)
 650 {
 651   gold_unreachable();
 652   return 0;
 653 }
 654
 655 // Get the name of a section.  Not used for plugin objects.
 656
 657 template<int size, bool big_endian>
 658 std::string
 659 Sized_pluginobj<size, big_endian>::do_section_name(unsigned int)
 660 {
 661   gold_unreachable();
 662   return std::string();
 663 }
 664
 665 // Return a view of the contents of a section.  Not used for plugin objects.
 666
 667 template<int size, bool big_endian>
 668 Object::Location
 669 Sized_pluginobj<size, big_endian>::do_section_contents(unsigned int)
 670 {
 671   Location loc(0, 0);
 672
 673   gold_unreachable();
 674   return loc;
 675 }
 676
 677 // Return section flags.  Not used for plugin objects.
 678
 679 template<int size, bool big_endian>
 680 uint64_t
 681 Sized_pluginobj<size, big_endian>::do_section_flags(unsigned int)
 682 {
 683   gold_unreachable();
 684   return 0;
 685 }
 686
 687 // Return section entsize.  Not used for plugin objects.
 688
 689 template<int size, bool big_endian>
 690 uint64_t
 691 Sized_pluginobj<size, big_endian>::do_section_entsize(unsigned int)
 692 {
 693   gold_unreachable();
 694   return 0;
 695 }
 696
 697 // Return section address.  Not used for plugin objects.
 698
 699 template<int size, bool big_endian>
 700 uint64_t
 701 Sized_pluginobj<size, big_endian>::do_section_address(unsigned int)
 702 {
 703   gold_unreachable();
 704   return 0;
 705 }
 706
 707 // Return section type.  Not used for plugin objects.
 708
 709 template<int size, bool big_endian>
 710 unsigned int
 711 Sized_pluginobj<size, big_endian>::do_section_type(unsigned int)
 712 {
 713   gold_unreachable();
 714   return 0;
 715 }
 716
 717 // Return the section link field.  Not used for plugin objects.
 718
 719 template<int size, bool big_endian>
 720 unsigned int
 721 Sized_pluginobj<size, big_endian>::do_section_link(unsigned int)
 722 {
 723   gold_unreachable();
 724   return 0;
 725 }
 726
 727 // Return the section link field.  Not used for plugin objects.
 728
 729 template<int size, bool big_endian>
 730 unsigned int
 731 Sized_pluginobj<size, big_endian>::do_section_info(unsigned int)
 732 {
 733   gold_unreachable();
 734   return 0;
 735 }
 736
 737 // Return the section alignment.  Not used for plugin objects.
 738
 739 template<int size, bool big_endian>
 740 uint64_t
 741 Sized_pluginobj<size, big_endian>::do_section_addralign(unsigned int)
 742 {
 743   gold_unreachable();
 744   return 0;
 745 }
 746
 747 // Return the Xindex structure to use.  Not used for plugin objects.
 748
 749 template<int size, bool big_endian>
 750 Xindex*
 751 Sized_pluginobj<size, big_endian>::do_initialize_xindex()
 752 {
 753   gold_unreachable();
 754   return NULL;
 755 }
 756
 757 // Get symbol counts.  Not used for plugin objects.
 758
 759 template<int size, bool big_endian>
 760 void
 761 Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(const Symbol_table*,
 762                                                    size_t*, size_t*) const
 763 {
 764   gold_unreachable();
 765 }
 766
 767 // Class Plugin_finish.  This task runs after all replacement files have
 768 // been added.  It calls each plugin's cleanup handler.
 769
 770 class Plugin_finish : public Task
 771 {
 772  public:
 773   Plugin_finish(Task_token* this_blocker, Task_token* next_blocker)
 774     : this_blocker_(this_blocker), next_blocker_(next_blocker)
 775   { }
 776
 777   ~Plugin_finish()
 778   {
 779     if (this->this_blocker_ != NULL)
 780       delete this->this_blocker_;
 781   }
 782
 783   Task_token*
 784   is_runnable()
 785   {
 786     if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 787       return this->this_blocker_;
 788     return NULL;
 789   }
 790
 791   void
 792   locks(Task_locker* tl)
 793   { tl->add(this, this->next_blocker_); }
 794
 795   void
 796   run(Workqueue*)
 797   {
 798     Plugin_manager* plugins = parameters->options().plugins();
 799     gold_assert(plugins != NULL);
 800     plugins->cleanup();
 801   }
 802
 803   std::string
 804   get_name() const
 805   { return "Plugin_finish"; }
 806
 807  private:
 808   Task_token* this_blocker_;
 809   Task_token* next_blocker_;
 810 };
 811
 812 // Class Plugin_hook.
 813
 814 Plugin_hook::~Plugin_hook()
 815 {
 816 }
 817
 818 // Return whether a Plugin_hook task is runnable.
 819
 820 Task_token*
 821 Plugin_hook::is_runnable()
 822 {
 823   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 824     return this->this_blocker_;
 825   return NULL;
 826 }
 827
 828 // Return a Task_locker for a Plugin_hook task.  We don't need any
 829 // locks here.
 830
 831 void
 832 Plugin_hook::locks(Task_locker*)
 833 {
 834 }
 835
 836 // Run the "all symbols read" plugin hook.
 837
 838 void
 839 Plugin_hook::run(Workqueue* workqueue)
 840 {
 841   gold_assert(this->options_.has_plugins());
 842   this->options_.plugins()->all_symbols_read(workqueue,
 843                                              this,
 844                                              this->input_objects_,
 845                                              this->symtab_,
 846                                              this->layout_,
 847                                              this->dirpath_,
 848                                              this->mapfile_,
 849                                              &this->this_blocker_);
 850   workqueue->queue_soon(new Plugin_finish(this->this_blocker_,
 851                                           this->next_blocker_));
 852 }
 853
 854 // The C interface routines called by the plugins.
 855
 856 #ifdef ENABLE_PLUGINS
 857
 858 // Register a claim-file handler.
 859
 860 static enum ld_plugin_status
 861 register_claim_file(ld_plugin_claim_file_handler handler)
 862 {
 863   gold_assert(parameters->options().has_plugins());
 864   parameters->options().plugins()->set_claim_file_handler(handler);
 865   return LDPS_OK;
 866 }
 867
 868 // Register an all-symbols-read handler.
 869
 870 static enum ld_plugin_status
 871 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler)
 872 {
 873   gold_assert(parameters->options().has_plugins());
 874   parameters->options().plugins()->set_all_symbols_read_handler(handler);
 875   return LDPS_OK;
 876 }
 877
 878 // Register a cleanup handler.
 879
 880 static enum ld_plugin_status
 881 register_cleanup(ld_plugin_cleanup_handler handler)
 882 {
 883   gold_assert(parameters->options().has_plugins());
 884   parameters->options().plugins()->set_cleanup_handler(handler);
 885   return LDPS_OK;
 886 }
 887
 888 // Add symbols from a plugin-claimed input file.
 889
 890 static enum ld_plugin_status
 891 add_symbols(void* handle, int nsyms, const ld_plugin_symbol *syms)
 892 {
 893   gold_assert(parameters->options().has_plugins());
 894   Pluginobj* obj = parameters->options().plugins()->make_plugin_object(
 895       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
 896   if (obj == NULL)
 897     return LDPS_ERR;
 898   obj->store_incoming_symbols(nsyms, syms);
 899   return LDPS_OK;
 900 }
 901
 902 // Get the input file information with an open (possibly re-opened)
 903 // file descriptor.
 904
 905 static enum ld_plugin_status
 906 get_input_file(const void *handle, struct ld_plugin_input_file *file)
 907 {
 908   gold_assert(parameters->options().has_plugins());
 909   unsigned int obj_index =
 910       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
 911   return parameters->options().plugins()->get_input_file(obj_index, file);
 912 }
 913
 914 // Release the input file.
 915
 916 static enum ld_plugin_status
 917 release_input_file(const void *handle)
 918 {
 919   gold_assert(parameters->options().has_plugins());
 920   unsigned int obj_index =
 921       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
 922   return parameters->options().plugins()->release_input_file(obj_index);
 923 }
 924
 925 // Get the symbol resolution info for a plugin-claimed input file.
 926
 927 static enum ld_plugin_status
 928 get_symbols(const void * handle, int nsyms, ld_plugin_symbol* syms)
 929 {
 930   gold_assert(parameters->options().has_plugins());
 931   Pluginobj* obj = parameters->options().plugins()->object(
 932       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
 933   if (obj == NULL)
 934     return LDPS_ERR;
 935   return obj->get_symbol_resolution_info(nsyms, syms);
 936 }
 937
 938 // Add a new (real) input file generated by a plugin.
 939
 940 static enum ld_plugin_status
 941 add_input_file(char *pathname)
 942 {
 943   gold_assert(parameters->options().has_plugins());
 944   return parameters->options().plugins()->add_input_file(pathname);
 945 }
 946
 947 // Issue a diagnostic message from a plugin.
 948
 949 static enum ld_plugin_status
 950 message(int level, const char * format, ...)
 951 {
 952   va_list args;
 953   va_start(args, format);
 954
 955   switch (level)
 956     {
 957     case LDPL_INFO:
 958       parameters->errors()->info(format, args);
 959       break;
 960     case LDPL_WARNING:
 961       parameters->errors()->warning(format, args);
 962       break;
 963     case LDPL_ERROR:
 964     default:
 965       parameters->errors()->error(format, args);
 966       break;
 967     case LDPL_FATAL:
 968       parameters->errors()->fatal(format, args);
 969       break;
 970     }
 971
 972   va_end(args);
 973   return LDPS_OK;
 974 }
 975
 976 #endif // ENABLE_PLUGINS
 977
 978 // Allocate a Pluginobj object of the appropriate size and endianness.
 979
 980 static Pluginobj*
 981 make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize)
 982 {
 983   Target* target;
 984   Pluginobj* obj = NULL;
 985
 986   if (parameters->target_valid())
 987     target = const_cast<Target*>(&parameters->target());
 988   else
 989     target = const_cast<Target*>(&parameters->default_target());
 990
 991   if (target->get_size() == 32)
 992     {
 993       if (target->is_big_endian())
 994 #ifdef HAVE_TARGET_32_BIG
 995         obj = new Sized_pluginobj<32, true>(input_file->filename(),
 996                                             input_file, offset, filesize);
 997 #else
 998         gold_error(_("%s: not configured to support "
 999                      "32-bit big-endian object"),
1000                    input_file->filename().c_str());
1001 #endif
1002       else
1003 #ifdef HAVE_TARGET_32_LITTLE
1004         obj = new Sized_pluginobj<32, false>(input_file->filename(),
1005                                              input_file, offset, filesize);
1006 #else
1007         gold_error(_("%s: not configured to support "
1008                      "32-bit little-endian object"),
1009                    input_file->filename().c_str());
1010 #endif
1011     }
1012   else if (target->get_size() == 64)
1013     {
1014       if (target->is_big_endian())
1015 #ifdef HAVE_TARGET_64_BIG
1016         obj = new Sized_pluginobj<64, true>(input_file->filename(),
1017                                             input_file, offset, filesize);
1018 #else
1019         gold_error(_("%s: not configured to support "
1020                      "64-bit big-endian object"),
1021                    input_file->filename().c_str());
1022 #endif
1023       else
1024 #ifdef HAVE_TARGET_64_LITTLE
1025         obj = new Sized_pluginobj<64, false>(input_file->filename(),
1026                                              input_file, offset, filesize);
1027 #else
1028         gold_error(_("%s: not configured to support "
1029                      "64-bit little-endian object"),
1030                    input_file->filename().c_str());
1031 #endif
1032     }
1033
1034   gold_assert(obj != NULL);
1035   obj->set_target(target);
1036   return obj;
1037 }
1038
1039 } // End namespace gold.