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 add_input_library(char *pathname);
  78
  79 static enum ld_plugin_status
  80 message(int level, const char *format, ...);
  81
  82 };
  83
  84 #endif // ENABLE_PLUGINS
  85
  86 static Pluginobj* make_sized_plugin_object(Input_file* input_file,
  87                                            off_t offset, off_t filesize);
  88
  89 // Plugin methods.
  90
  91 // Load one plugin library.
  92
  93 void
  94 Plugin::load()
  95 {
  96 #ifdef ENABLE_PLUGINS
  97   // Load the plugin library.
  98   // FIXME: Look for the library in standard locations.
  99   this->handle_ = dlopen(this->filename_.c_str(), RTLD_NOW);
 100   if (this->handle_ == NULL)
 101     {
 102       gold_error(_("%s: could not load plugin library"),
 103                  this->filename_.c_str());
 104       return;
 105     }
 106
 107   // Find the plugin's onload entry point.
 108   ld_plugin_onload onload = reinterpret_cast<ld_plugin_onload>
 109     (dlsym(this->handle_, "onload"));
 110   if (onload == NULL)
 111     {
 112       gold_error(_("%s: could not find onload entry point"),
 113                  this->filename_.c_str());
 114       return;
 115     }
 116
 117   // Get the linker's version number.
 118   const char* ver = get_version_string();
 119   int major = 0;
 120   int minor = 0;
 121   sscanf(ver, "%d.%d", &major, &minor);
 122
 123   // Allocate and populate a transfer vector.
 124   const int tv_fixed_size = 14;
 125   int tv_size = this->args_.size() + tv_fixed_size;
 126   ld_plugin_tv *tv = new ld_plugin_tv[tv_size];
 127
 128   // Put LDPT_MESSAGE at the front of the list so the plugin can use it
 129   // while processing subsequent entries.
 130   int i = 0;
 131   tv[i].tv_tag = LDPT_MESSAGE;
 132   tv[i].tv_u.tv_message = message;
 133
 134   ++i;
 135   tv[i].tv_tag = LDPT_API_VERSION;
 136   tv[i].tv_u.tv_val = LD_PLUGIN_API_VERSION;
 137
 138   ++i;
 139   tv[i].tv_tag = LDPT_GOLD_VERSION;
 140   tv[i].tv_u.tv_val = major * 100 + minor;
 141
 142   ++i;
 143   tv[i].tv_tag = LDPT_LINKER_OUTPUT;
 144   if (parameters->options().relocatable())
 145     tv[i].tv_u.tv_val = LDPO_REL;
 146   else if (parameters->options().shared())
 147     tv[i].tv_u.tv_val = LDPO_DYN;
 148   else
 149     tv[i].tv_u.tv_val = LDPO_EXEC;
 150
 151   for (unsigned int j = 0; j < this->args_.size(); ++j)
 152     {
 153       ++i;
 154       tv[i].tv_tag = LDPT_OPTION;
 155       tv[i].tv_u.tv_string = this->args_[j].c_str();
 156     }
 157
 158   ++i;
 159   tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
 160   tv[i].tv_u.tv_register_claim_file = register_claim_file;
 161
 162   ++i;
 163   tv[i].tv_tag = LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK;
 164   tv[i].tv_u.tv_register_all_symbols_read = register_all_symbols_read;
 165
 166   ++i;
 167   tv[i].tv_tag = LDPT_REGISTER_CLEANUP_HOOK;
 168   tv[i].tv_u.tv_register_cleanup = register_cleanup;
 169
 170   ++i;
 171   tv[i].tv_tag = LDPT_ADD_SYMBOLS;
 172   tv[i].tv_u.tv_add_symbols = add_symbols;
 173
 174   ++i;
 175   tv[i].tv_tag = LDPT_GET_INPUT_FILE;
 176   tv[i].tv_u.tv_get_input_file = get_input_file;
 177
 178   ++i;
 179   tv[i].tv_tag = LDPT_RELEASE_INPUT_FILE;
 180   tv[i].tv_u.tv_release_input_file = release_input_file;
 181
 182   ++i;
 183   tv[i].tv_tag = LDPT_GET_SYMBOLS;
 184   tv[i].tv_u.tv_get_symbols = get_symbols;
 185
 186   ++i;
 187   tv[i].tv_tag = LDPT_ADD_INPUT_FILE;
 188   tv[i].tv_u.tv_add_input_file = add_input_file;
 189
 190   ++i;
 191   tv[i].tv_tag = LDPT_ADD_INPUT_LIBRARY;
 192   tv[i].tv_u.tv_add_input_library = add_input_library;
 193
 194   ++i;
 195   tv[i].tv_tag = LDPT_NULL;
 196   tv[i].tv_u.tv_val = 0;
 197
 198   gold_assert(i == tv_size - 1);
 199
 200   // Call the onload entry point.
 201   (*onload)(tv);
 202
 203   delete[] tv;
 204 #endif // ENABLE_PLUGINS
 205 }
 206
 207 // Call the plugin claim-file handler.
 208
 209 inline bool
 210 Plugin::claim_file(struct ld_plugin_input_file *plugin_input_file)
 211 {
 212   int claimed = 0;
 213
 214   if (this->claim_file_handler_ != NULL)
 215     {
 216       (*this->claim_file_handler_)(plugin_input_file, &claimed);
 217       if (claimed)
 218         return true;
 219     }
 220   return false;
 221 }
 222
 223 // Call the all-symbols-read handler.
 224
 225 inline void
 226 Plugin::all_symbols_read()
 227 {
 228   if (this->all_symbols_read_handler_ != NULL)
 229     (*this->all_symbols_read_handler_)();
 230 }
 231
 232 // Call the cleanup handler.
 233
 234 inline void
 235 Plugin::cleanup()
 236 {
 237   if (this->cleanup_handler_ != NULL)
 238     (*this->cleanup_handler_)();
 239 }
 240
 241 // Plugin_manager methods.
 242
 243 Plugin_manager::~Plugin_manager()
 244 {
 245   for (Plugin_list::iterator p = this->plugins_.begin();
 246        p != this->plugins_.end();
 247        ++p)
 248     delete *p;
 249   this->plugins_.clear();
 250   for (Object_list::iterator obj = this->objects_.begin();
 251        obj != this->objects_.end();
 252        ++obj)
 253     delete *obj;
 254   this->objects_.clear();
 255 }
 256
 257 // Load all plugin libraries.
 258
 259 void
 260 Plugin_manager::load_plugins()
 261 {
 262   for (this->current_ = this->plugins_.begin();
 263        this->current_ != this->plugins_.end();
 264        ++this->current_)
 265     (*this->current_)->load();
 266 }
 267
 268 // Call the plugin claim-file handlers in turn to see if any claim the file.
 269
 270 Pluginobj*
 271 Plugin_manager::claim_file(Input_file* input_file, off_t offset,
 272                            off_t filesize)
 273 {
 274   if (this->in_replacement_phase_)
 275     return NULL;
 276
 277   unsigned int handle = this->objects_.size();
 278   this->input_file_ = input_file;
 279   this->plugin_input_file_.name = input_file->filename().c_str();
 280   this->plugin_input_file_.fd = input_file->file().descriptor();
 281   this->plugin_input_file_.offset = offset;
 282   this->plugin_input_file_.filesize = filesize;
 283   this->plugin_input_file_.handle = reinterpret_cast<void*>(handle);
 284
 285   for (this->current_ = this->plugins_.begin();
 286        this->current_ != this->plugins_.end();
 287        ++this->current_)
 288     {
 289       if ((*this->current_)->claim_file(&this->plugin_input_file_))
 290         {
 291           if (this->objects_.size() > handle)
 292             return this->objects_[handle];
 293
 294           // If the plugin claimed the file but did not call the
 295           // add_symbols callback, we need to create the Pluginobj now.
 296           Pluginobj* obj = this->make_plugin_object(handle);
 297           return obj;
 298         }
 299     }
 300
 301   return NULL;
 302 }
 303
 304 // Call the all-symbols-read handlers.
 305
 306 void
 307 Plugin_manager::all_symbols_read(Workqueue* workqueue, Task* task,
 308                                  Input_objects* input_objects,
 309                                  Symbol_table* symtab, Layout* layout,
 310                                  Dirsearch* dirpath, Mapfile* mapfile,
 311                                  Task_token** last_blocker)
 312 {
 313   this->in_replacement_phase_ = true;
 314   this->workqueue_ = workqueue;
 315   this->task_ = task;
 316   this->input_objects_ = input_objects;
 317   this->symtab_ = symtab;
 318   this->layout_ = layout;
 319   this->dirpath_ = dirpath;
 320   this->mapfile_ = mapfile;
 321   this->this_blocker_ = NULL;
 322
 323   for (this->current_ = this->plugins_.begin();
 324        this->current_ != this->plugins_.end();
 325        ++this->current_)
 326     (*this->current_)->all_symbols_read();
 327
 328   *last_blocker = this->this_blocker_;
 329 }
 330
 331 // Layout deferred objects.
 332
 333 void
 334 Plugin_manager::layout_deferred_objects()
 335 {
 336   Deferred_layout_list::iterator obj;
 337
 338   for (obj = this->deferred_layout_objects_.begin();
 339        obj != this->deferred_layout_objects_.end();
 340        ++obj)
 341     (*obj)->layout_deferred_sections(this->layout_);
 342 }
 343
 344 // Call the cleanup handlers.
 345
 346 void
 347 Plugin_manager::cleanup()
 348 {
 349   if (this->cleanup_done_)
 350     return;
 351   for (this->current_ = this->plugins_.begin();
 352        this->current_ != this->plugins_.end();
 353        ++this->current_)
 354     (*this->current_)->cleanup();
 355   this->cleanup_done_ = true;
 356 }
 357
 358 // Make a new Pluginobj object.  This is called when the plugin calls
 359 // the add_symbols API.
 360
 361 Pluginobj*
 362 Plugin_manager::make_plugin_object(unsigned int handle)
 363 {
 364   // Make sure we aren't asked to make an object for the same handle twice.
 365   if (this->objects_.size() != handle)
 366     return NULL;
 367
 368   Pluginobj* obj = make_sized_plugin_object(this->input_file_,
 369                                             this->plugin_input_file_.offset,
 370                                             this->plugin_input_file_.filesize);
 371   this->objects_.push_back(obj);
 372   return obj;
 373 }
 374
 375 // Get the input file information with an open (possibly re-opened)
 376 // file descriptor.
 377
 378 ld_plugin_status
 379 Plugin_manager::get_input_file(unsigned int handle,
 380                                struct ld_plugin_input_file *file)
 381 {
 382   Pluginobj* obj = this->object(handle);
 383   if (obj == NULL)
 384     return LDPS_BAD_HANDLE;
 385
 386   obj->lock(this->task_);
 387   file->name = obj->filename().c_str();
 388   file->fd = obj->descriptor();
 389   file->offset = obj->offset();
 390   file->filesize = obj->filesize();
 391   file->handle = reinterpret_cast<void*>(handle);
 392   return LDPS_OK;
 393 }
 394
 395 // Release the input file.
 396
 397 ld_plugin_status
 398 Plugin_manager::release_input_file(unsigned int handle)
 399 {
 400   Pluginobj* obj = this->object(handle);
 401   if (obj == NULL)
 402     return LDPS_BAD_HANDLE;
 403
 404   obj->unlock(this->task_);
 405   return LDPS_OK;
 406 }
 407
 408 // Add a new input file.
 409
 410 ld_plugin_status
 411 Plugin_manager::add_input_file(char *pathname, bool is_lib)
 412 {
 413   Input_file_argument file(pathname, is_lib, "", false, this->options_);
 414   Input_argument* input_argument = new Input_argument(file);
 415   Task_token* next_blocker = new Task_token(true);
 416   next_blocker->add_blocker();
 417   if (this->layout_->incremental_inputs())
 418     gold_error(_("Input files added by plug-ins in --incremental mode not "
 419                  "supported yet.\n"));
 420   this->workqueue_->queue_soon(new Read_symbols(this->input_objects_,
 421                                                 this->symtab_,
 422                                                 this->layout_,
 423                                                 this->dirpath_,
 424                                                 0,
 425                                                 this->mapfile_,
 426                                                 input_argument,
 427                                                 NULL,
 428                                                 this->this_blocker_,
 429                                                 next_blocker));
 430   this->this_blocker_ = next_blocker;
 431   return LDPS_OK;
 432 }
 433
 434 // Class Pluginobj.
 435
 436 Pluginobj::Pluginobj(const std::string& name, Input_file* input_file,
 437                      off_t offset, off_t filesize)
 438   : Object(name, input_file, false, offset),
 439     nsyms_(0), syms_(NULL), symbols_(), filesize_(filesize), comdat_map_()
 440 {
 441 }
 442
 443 // Return TRUE if a defined symbol might be reachable from outside the
 444 // universe of claimed objects.
 445
 446 static inline bool
 447 is_visible_from_outside(Symbol* lsym)
 448 {
 449   if (lsym->in_real_elf())
 450     return true;
 451   if (parameters->options().relocatable())
 452     return true;
 453   if (parameters->options().export_dynamic() || parameters->options().shared())
 454     return lsym->is_externally_visible();
 455   return false;
 456 }
 457
 458 // Get symbol resolution info.
 459
 460 ld_plugin_status
 461 Pluginobj::get_symbol_resolution_info(int nsyms, ld_plugin_symbol* syms) const
 462 {
 463   if (nsyms > this->nsyms_)
 464     return LDPS_NO_SYMS;
 465   for (int i = 0; i < nsyms; i++)
 466     {
 467       ld_plugin_symbol* isym = &syms[i];
 468       Symbol* lsym = this->symbols_[i];
 469       ld_plugin_symbol_resolution res = LDPR_UNKNOWN;
 470
 471       if (lsym->is_undefined())
 472         // The symbol remains undefined.
 473         res = LDPR_UNDEF;
 474       else if (isym->def == LDPK_UNDEF
 475                || isym->def == LDPK_WEAKUNDEF
 476                || isym->def == LDPK_COMMON)
 477         {
 478           // The original symbol was undefined or common.
 479           if (lsym->source() != Symbol::FROM_OBJECT)
 480             res = LDPR_RESOLVED_EXEC;
 481           else if (lsym->object()->pluginobj() != NULL)
 482             res = LDPR_RESOLVED_IR;
 483           else if (lsym->object()->is_dynamic())
 484             res = LDPR_RESOLVED_DYN;
 485           else
 486             res = LDPR_RESOLVED_EXEC;
 487         }
 488       else
 489         {
 490           // The original symbol was a definition.
 491           if (lsym->source() != Symbol::FROM_OBJECT)
 492             res = LDPR_PREEMPTED_REG;
 493           else if (lsym->object() == static_cast<const Object*>(this))
 494             res = (is_visible_from_outside(lsym)
 495                    ? LDPR_PREVAILING_DEF
 496                    : LDPR_PREVAILING_DEF_IRONLY);
 497           else
 498             res = (lsym->object()->pluginobj() != NULL
 499                    ? LDPR_PREEMPTED_IR
 500                    : LDPR_PREEMPTED_REG);
 501         }
 502       isym->resolution = res;
 503     }
 504   return LDPS_OK;
 505 }
 506
 507 // Return TRUE if the comdat group with key COMDAT_KEY from this object
 508 // should be kept.
 509
 510 bool
 511 Pluginobj::include_comdat_group(std::string comdat_key, Layout* layout)
 512 {
 513   std::pair<Comdat_map::iterator, bool> ins =
 514     this->comdat_map_.insert(std::make_pair(comdat_key, false));
 515
 516   // If this is the first time we've seen this comdat key, ask the
 517   // layout object whether it should be included.
 518   if (ins.second)
 519     ins.first->second = layout->find_or_add_kept_section(comdat_key,
 520                                                          NULL, 0, true,
 521                                                          true, NULL);
 522
 523   return ins.first->second;
 524 }
 525
 526 // Class Sized_pluginobj.
 527
 528 template<int size, bool big_endian>
 529 Sized_pluginobj<size, big_endian>::Sized_pluginobj(
 530     const std::string& name,
 531     Input_file* input_file,
 532     off_t offset,
 533     off_t filesize)
 534   : Pluginobj(name, input_file, offset, filesize)
 535 {
 536 }
 537
 538 // Read the symbols.  Not used for plugin objects.
 539
 540 template<int size, bool big_endian>
 541 void
 542 Sized_pluginobj<size, big_endian>::do_read_symbols(Read_symbols_data*)
 543 {
 544   gold_unreachable();
 545 }
 546
 547 // Lay out the input sections.  Not used for plugin objects.
 548
 549 template<int size, bool big_endian>
 550 void
 551 Sized_pluginobj<size, big_endian>::do_layout(Symbol_table*, Layout*,
 552                                              Read_symbols_data*)
 553 {
 554   gold_unreachable();
 555 }
 556
 557 // Add the symbols to the symbol table.
 558
 559 template<int size, bool big_endian>
 560 void
 561 Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
 562                                                   Read_symbols_data*,
 563                                                   Layout* layout)
 564 {
 565   const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 566   unsigned char symbuf[sym_size];
 567   elfcpp::Sym<size, big_endian> sym(symbuf);
 568   elfcpp::Sym_write<size, big_endian> osym(symbuf);
 569
 570   typedef typename elfcpp::Elf_types<size>::Elf_WXword Elf_size_type;
 571
 572   this->symbols_.resize(this->nsyms_);
 573
 574   for (int i = 0; i < this->nsyms_; ++i)
 575     {
 576       const struct ld_plugin_symbol *isym = &this->syms_[i];
 577       const char* name = isym->name;
 578       const char* ver = isym->version;
 579       elfcpp::Elf_Half shndx;
 580       elfcpp::STB bind;
 581       elfcpp::STV vis;
 582
 583       if (name != NULL && name[0] == '\0')
 584         name = NULL;
 585       if (ver != NULL && ver[0] == '\0')
 586         ver = NULL;
 587
 588       switch (isym->def)
 589         {
 590         case LDPK_WEAKDEF:
 591         case LDPK_WEAKUNDEF:
 592           bind = elfcpp::STB_WEAK;
 593           break;
 594         case LDPK_DEF:
 595         case LDPK_UNDEF:
 596         case LDPK_COMMON:
 597         default:
 598           bind = elfcpp::STB_GLOBAL;
 599           break;
 600         }
 601
 602       switch (isym->def)
 603         {
 604         case LDPK_DEF:
 605         case LDPK_WEAKDEF:
 606           shndx = elfcpp::SHN_ABS;
 607           break;
 608         case LDPK_COMMON:
 609           shndx = elfcpp::SHN_COMMON;
 610           break;
 611         case LDPK_UNDEF:
 612         case LDPK_WEAKUNDEF:
 613         default:
 614           shndx = elfcpp::SHN_UNDEF;
 615           break;
 616         }
 617
 618       switch (isym->visibility)
 619         {
 620         case LDPV_PROTECTED:
 621           vis = elfcpp::STV_DEFAULT;
 622           break;
 623         case LDPV_INTERNAL:
 624           vis = elfcpp::STV_DEFAULT;
 625           break;
 626         case LDPV_HIDDEN:
 627           vis = elfcpp::STV_DEFAULT;
 628           break;
 629         case LDPV_DEFAULT:
 630         default:
 631           vis = elfcpp::STV_DEFAULT;
 632           break;
 633         }
 634
 635       if (isym->comdat_key != NULL
 636           && isym->comdat_key[0] != '\0'
 637           && !this->include_comdat_group(isym->comdat_key, layout))
 638         shndx = elfcpp::SHN_UNDEF;
 639
 640       osym.put_st_name(0);
 641       osym.put_st_value(0);
 642       osym.put_st_size(static_cast<Elf_size_type>(isym->size));
 643       osym.put_st_info(bind, elfcpp::STT_NOTYPE);
 644       osym.put_st_other(vis, 0);
 645       osym.put_st_shndx(shndx);
 646
 647       this->symbols_[i] =
 648         symtab->add_from_pluginobj<size, big_endian>(this, name, ver, &sym);
 649     }
 650 }
 651
 652 // Get the size of a section.  Not used for plugin objects.
 653
 654 template<int size, bool big_endian>
 655 uint64_t
 656 Sized_pluginobj<size, big_endian>::do_section_size(unsigned int)
 657 {
 658   gold_unreachable();
 659   return 0;
 660 }
 661
 662 // Get the name of a section.  Not used for plugin objects.
 663
 664 template<int size, bool big_endian>
 665 std::string
 666 Sized_pluginobj<size, big_endian>::do_section_name(unsigned int)
 667 {
 668   gold_unreachable();
 669   return std::string();
 670 }
 671
 672 // Return a view of the contents of a section.  Not used for plugin objects.
 673
 674 template<int size, bool big_endian>
 675 Object::Location
 676 Sized_pluginobj<size, big_endian>::do_section_contents(unsigned int)
 677 {
 678   Location loc(0, 0);
 679
 680   gold_unreachable();
 681   return loc;
 682 }
 683
 684 // Return section flags.  Not used for plugin objects.
 685
 686 template<int size, bool big_endian>
 687 uint64_t
 688 Sized_pluginobj<size, big_endian>::do_section_flags(unsigned int)
 689 {
 690   gold_unreachable();
 691   return 0;
 692 }
 693
 694 // Return section entsize.  Not used for plugin objects.
 695
 696 template<int size, bool big_endian>
 697 uint64_t
 698 Sized_pluginobj<size, big_endian>::do_section_entsize(unsigned int)
 699 {
 700   gold_unreachable();
 701   return 0;
 702 }
 703
 704 // Return section address.  Not used for plugin objects.
 705
 706 template<int size, bool big_endian>
 707 uint64_t
 708 Sized_pluginobj<size, big_endian>::do_section_address(unsigned int)
 709 {
 710   gold_unreachable();
 711   return 0;
 712 }
 713
 714 // Return section type.  Not used for plugin objects.
 715
 716 template<int size, bool big_endian>
 717 unsigned int
 718 Sized_pluginobj<size, big_endian>::do_section_type(unsigned int)
 719 {
 720   gold_unreachable();
 721   return 0;
 722 }
 723
 724 // Return the section link field.  Not used for plugin objects.
 725
 726 template<int size, bool big_endian>
 727 unsigned int
 728 Sized_pluginobj<size, big_endian>::do_section_link(unsigned int)
 729 {
 730   gold_unreachable();
 731   return 0;
 732 }
 733
 734 // Return the section link field.  Not used for plugin objects.
 735
 736 template<int size, bool big_endian>
 737 unsigned int
 738 Sized_pluginobj<size, big_endian>::do_section_info(unsigned int)
 739 {
 740   gold_unreachable();
 741   return 0;
 742 }
 743
 744 // Return the section alignment.  Not used for plugin objects.
 745
 746 template<int size, bool big_endian>
 747 uint64_t
 748 Sized_pluginobj<size, big_endian>::do_section_addralign(unsigned int)
 749 {
 750   gold_unreachable();
 751   return 0;
 752 }
 753
 754 // Return the Xindex structure to use.  Not used for plugin objects.
 755
 756 template<int size, bool big_endian>
 757 Xindex*
 758 Sized_pluginobj<size, big_endian>::do_initialize_xindex()
 759 {
 760   gold_unreachable();
 761   return NULL;
 762 }
 763
 764 // Get symbol counts.  Not used for plugin objects.
 765
 766 template<int size, bool big_endian>
 767 void
 768 Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(const Symbol_table*,
 769                                                    size_t*, size_t*) const
 770 {
 771   gold_unreachable();
 772 }
 773
 774 // Class Plugin_finish.  This task runs after all replacement files have
 775 // been added.  It calls each plugin's cleanup handler.
 776
 777 class Plugin_finish : public Task
 778 {
 779  public:
 780   Plugin_finish(Task_token* this_blocker, Task_token* next_blocker)
 781     : this_blocker_(this_blocker), next_blocker_(next_blocker)
 782   { }
 783
 784   ~Plugin_finish()
 785   {
 786     if (this->this_blocker_ != NULL)
 787       delete this->this_blocker_;
 788   }
 789
 790   Task_token*
 791   is_runnable()
 792   {
 793     if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 794       return this->this_blocker_;
 795     return NULL;
 796   }
 797
 798   void
 799   locks(Task_locker* tl)
 800   { tl->add(this, this->next_blocker_); }
 801
 802   void
 803   run(Workqueue*)
 804   {
 805     Plugin_manager* plugins = parameters->options().plugins();
 806     gold_assert(plugins != NULL);
 807     plugins->cleanup();
 808   }
 809
 810   std::string
 811   get_name() const
 812   { return "Plugin_finish"; }
 813
 814  private:
 815   Task_token* this_blocker_;
 816   Task_token* next_blocker_;
 817 };
 818
 819 // Class Plugin_hook.
 820
 821 Plugin_hook::~Plugin_hook()
 822 {
 823 }
 824
 825 // Return whether a Plugin_hook task is runnable.
 826
 827 Task_token*
 828 Plugin_hook::is_runnable()
 829 {
 830   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 831     return this->this_blocker_;
 832   return NULL;
 833 }
 834
 835 // Return a Task_locker for a Plugin_hook task.  We don't need any
 836 // locks here.
 837
 838 void
 839 Plugin_hook::locks(Task_locker*)
 840 {
 841 }
 842
 843 // Run the "all symbols read" plugin hook.
 844
 845 void
 846 Plugin_hook::run(Workqueue* workqueue)
 847 {
 848   gold_assert(this->options_.has_plugins());
 849   this->options_.plugins()->all_symbols_read(workqueue,
 850                                              this,
 851                                              this->input_objects_,
 852                                              this->symtab_,
 853                                              this->layout_,
 854                                              this->dirpath_,
 855                                              this->mapfile_,
 856                                              &this->this_blocker_);
 857   workqueue->queue_soon(new Plugin_finish(this->this_blocker_,
 858                                           this->next_blocker_));
 859 }
 860
 861 // The C interface routines called by the plugins.
 862
 863 #ifdef ENABLE_PLUGINS
 864
 865 // Register a claim-file handler.
 866
 867 static enum ld_plugin_status
 868 register_claim_file(ld_plugin_claim_file_handler handler)
 869 {
 870   gold_assert(parameters->options().has_plugins());
 871   parameters->options().plugins()->set_claim_file_handler(handler);
 872   return LDPS_OK;
 873 }
 874
 875 // Register an all-symbols-read handler.
 876
 877 static enum ld_plugin_status
 878 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler)
 879 {
 880   gold_assert(parameters->options().has_plugins());
 881   parameters->options().plugins()->set_all_symbols_read_handler(handler);
 882   return LDPS_OK;
 883 }
 884
 885 // Register a cleanup handler.
 886
 887 static enum ld_plugin_status
 888 register_cleanup(ld_plugin_cleanup_handler handler)
 889 {
 890   gold_assert(parameters->options().has_plugins());
 891   parameters->options().plugins()->set_cleanup_handler(handler);
 892   return LDPS_OK;
 893 }
 894
 895 // Add symbols from a plugin-claimed input file.
 896
 897 static enum ld_plugin_status
 898 add_symbols(void* handle, int nsyms, const ld_plugin_symbol *syms)
 899 {
 900   gold_assert(parameters->options().has_plugins());
 901   Pluginobj* obj = parameters->options().plugins()->make_plugin_object(
 902       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
 903   if (obj == NULL)
 904     return LDPS_ERR;
 905   obj->store_incoming_symbols(nsyms, syms);
 906   return LDPS_OK;
 907 }
 908
 909 // Get the input file information with an open (possibly re-opened)
 910 // file descriptor.
 911
 912 static enum ld_plugin_status
 913 get_input_file(const void *handle, struct ld_plugin_input_file *file)
 914 {
 915   gold_assert(parameters->options().has_plugins());
 916   unsigned int obj_index =
 917       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
 918   return parameters->options().plugins()->get_input_file(obj_index, file);
 919 }
 920
 921 // Release the input file.
 922
 923 static enum ld_plugin_status
 924 release_input_file(const void *handle)
 925 {
 926   gold_assert(parameters->options().has_plugins());
 927   unsigned int obj_index =
 928       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
 929   return parameters->options().plugins()->release_input_file(obj_index);
 930 }
 931
 932 // Get the symbol resolution info for a plugin-claimed input file.
 933
 934 static enum ld_plugin_status
 935 get_symbols(const void * handle, int nsyms, ld_plugin_symbol* syms)
 936 {
 937   gold_assert(parameters->options().has_plugins());
 938   Pluginobj* obj = parameters->options().plugins()->object(
 939       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
 940   if (obj == NULL)
 941     return LDPS_ERR;
 942   return obj->get_symbol_resolution_info(nsyms, syms);
 943 }
 944
 945 // Add a new (real) input file generated by a plugin.
 946
 947 static enum ld_plugin_status
 948 add_input_file(char *pathname)
 949 {
 950   gold_assert(parameters->options().has_plugins());
 951   return parameters->options().plugins()->add_input_file(pathname, false);
 952 }
 953
 954 // Add a new (real) library required by a plugin.
 955
 956 static enum ld_plugin_status
 957 add_input_library(char *pathname)
 958 {
 959   gold_assert(parameters->options().has_plugins());
 960   return parameters->options().plugins()->add_input_file(pathname, true);
 961 }
 962
 963 // Issue a diagnostic message from a plugin.
 964
 965 static enum ld_plugin_status
 966 message(int level, const char * format, ...)
 967 {
 968   va_list args;
 969   va_start(args, format);
 970
 971   switch (level)
 972     {
 973     case LDPL_INFO:
 974       parameters->errors()->info(format, args);
 975       break;
 976     case LDPL_WARNING:
 977       parameters->errors()->warning(format, args);
 978       break;
 979     case LDPL_ERROR:
 980     default:
 981       parameters->errors()->error(format, args);
 982       break;
 983     case LDPL_FATAL:
 984       parameters->errors()->fatal(format, args);
 985       break;
 986     }
 987
 988   va_end(args);
 989   return LDPS_OK;
 990 }
 991
 992 #endif // ENABLE_PLUGINS
 993
 994 // Allocate a Pluginobj object of the appropriate size and endianness.
 995
 996 static Pluginobj*
 997 make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize)
 998 {
 999   Pluginobj* obj = NULL;
1000
1001   parameters_force_valid_target();
1002   const Target& target(parameters->target());
1003
1004   if (target.get_size() == 32)
1005     {
1006       if (target.is_big_endian())
1007 #ifdef HAVE_TARGET_32_BIG
1008         obj = new Sized_pluginobj<32, true>(input_file->filename(),
1009                                             input_file, offset, filesize);
1010 #else
1011         gold_error(_("%s: not configured to support "
1012                      "32-bit big-endian object"),
1013                    input_file->filename().c_str());
1014 #endif
1015       else
1016 #ifdef HAVE_TARGET_32_LITTLE
1017         obj = new Sized_pluginobj<32, false>(input_file->filename(),
1018                                              input_file, offset, filesize);
1019 #else
1020         gold_error(_("%s: not configured to support "
1021                      "32-bit little-endian object"),
1022                    input_file->filename().c_str());
1023 #endif
1024     }
1025   else if (target.get_size() == 64)
1026     {
1027       if (target.is_big_endian())
1028 #ifdef HAVE_TARGET_64_BIG
1029         obj = new Sized_pluginobj<64, true>(input_file->filename(),
1030                                             input_file, offset, filesize);
1031 #else
1032         gold_error(_("%s: not configured to support "
1033                      "64-bit big-endian object"),
1034                    input_file->filename().c_str());
1035 #endif
1036       else
1037 #ifdef HAVE_TARGET_64_LITTLE
1038         obj = new Sized_pluginobj<64, false>(input_file->filename(),
1039                                              input_file, offset, filesize);
1040 #else
1041         gold_error(_("%s: not configured to support "
1042                      "64-bit little-endian object"),
1043                    input_file->filename().c_str());
1044 #endif
1045     }
1046
1047   gold_assert(obj != NULL);
1048   return obj;
1049 }
1050
1051 } // End namespace gold.