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   this->workqueue_->queue_soon(new Read_symbols(this->input_objects_,
 411                                                 this->symtab_,
 412                                                 this->layout_,
 413                                                 this->dirpath_,
 414                                                 this->mapfile_,
 415                                                 input_argument,
 416                                                 NULL,
 417                                                 this->this_blocker_,
 418                                                 next_blocker));
 419   this->this_blocker_ = next_blocker;
 420   return LDPS_OK;
 421 }
 422
 423 // Class Pluginobj.
 424
 425 Pluginobj::Pluginobj(const std::string& name, Input_file* input_file,
 426                      off_t offset, off_t filesize)
 427   : Object(name, input_file, false, offset),
 428     nsyms_(0), syms_(NULL), symbols_(), filesize_(filesize), comdat_map_()
 429 {
 430 }
 431
 432 // Return TRUE if a defined symbol might be reachable from outside the
 433 // universe of claimed objects.
 434
 435 static inline bool
 436 is_visible_from_outside(Symbol* lsym)
 437 {
 438   if (lsym->in_real_elf())
 439     return true;
 440   if (parameters->options().relocatable())
 441     return true;
 442   if (parameters->options().export_dynamic() || parameters->options().shared())
 443     return lsym->is_externally_visible();
 444   return false;
 445 }
 446
 447 // Get symbol resolution info.
 448
 449 ld_plugin_status
 450 Pluginobj::get_symbol_resolution_info(int nsyms, ld_plugin_symbol* syms) const
 451 {
 452   if (nsyms > this->nsyms_)
 453     return LDPS_NO_SYMS;
 454   for (int i = 0; i < nsyms; i++)
 455     {
 456       ld_plugin_symbol* isym = &syms[i];
 457       Symbol* lsym = this->symbols_[i];
 458       ld_plugin_symbol_resolution res = LDPR_UNKNOWN;
 459
 460       if (lsym->is_undefined())
 461         // The symbol remains undefined.
 462         res = LDPR_UNDEF;
 463       else if (isym->def == LDPK_UNDEF
 464                || isym->def == LDPK_WEAKUNDEF
 465                || isym->def == LDPK_COMMON)
 466         {
 467           // The original symbol was undefined or common.
 468           if (lsym->source() != Symbol::FROM_OBJECT)
 469             res = LDPR_RESOLVED_EXEC;
 470           else if (lsym->object()->pluginobj() != NULL)
 471             res = LDPR_RESOLVED_IR;
 472           else if (lsym->object()->is_dynamic())
 473             res = LDPR_RESOLVED_DYN;
 474           else
 475             res = LDPR_RESOLVED_EXEC;
 476         }
 477       else
 478         {
 479           // The original symbol was a definition.
 480           if (lsym->source() != Symbol::FROM_OBJECT)
 481             res = LDPR_PREEMPTED_REG;
 482           else if (lsym->object() == static_cast<const Object*>(this))
 483             res = (is_visible_from_outside(lsym)
 484                    ? LDPR_PREVAILING_DEF
 485                    : LDPR_PREVAILING_DEF_IRONLY);
 486           else
 487             res = (lsym->object()->pluginobj() != NULL
 488                    ? LDPR_PREEMPTED_IR
 489                    : LDPR_PREEMPTED_REG);
 490         }
 491       isym->resolution = res;
 492     }
 493   return LDPS_OK;
 494 }
 495
 496 // Return TRUE if the comdat group with key COMDAT_KEY from this object
 497 // should be kept.
 498
 499 bool
 500 Pluginobj::include_comdat_group(std::string comdat_key, Layout* layout)
 501 {
 502   std::pair<Comdat_map::iterator, bool> ins =
 503     this->comdat_map_.insert(std::make_pair(comdat_key, false));
 504
 505   // If this is the first time we've seen this comdat key, ask the
 506   // layout object whether it should be included.
 507   if (ins.second)
 508     {
 509       Kept_section to_add(NULL, 1, true);
 510       ins.first->second = layout->find_or_add_kept_section(comdat_key,
 511                                                            &to_add,
 512                                                            NULL);
 513     }
 514
 515   return ins.first->second;
 516 }
 517
 518 // Class Sized_pluginobj.
 519
 520 template<int size, bool big_endian>
 521 Sized_pluginobj<size, big_endian>::Sized_pluginobj(
 522     const std::string& name,
 523     Input_file* input_file,
 524     off_t offset,
 525     off_t filesize)
 526   : Pluginobj(name, input_file, offset, filesize)
 527 {
 528 }
 529
 530 // Read the symbols.  Not used for plugin objects.
 531
 532 template<int size, bool big_endian>
 533 void
 534 Sized_pluginobj<size, big_endian>::do_read_symbols(Read_symbols_data*)
 535 {
 536   gold_unreachable();
 537 }
 538
 539 // Lay out the input sections.  Not used for plugin objects.
 540
 541 template<int size, bool big_endian>
 542 void
 543 Sized_pluginobj<size, big_endian>::do_layout(Symbol_table*, Layout*,
 544                                              Read_symbols_data*)
 545 {
 546   gold_unreachable();
 547 }
 548
 549 // Add the symbols to the symbol table.
 550
 551 template<int size, bool big_endian>
 552 void
 553 Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
 554                                                   Read_symbols_data*,
 555                                                   Layout* layout)
 556 {
 557   const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 558   unsigned char symbuf[sym_size];
 559   elfcpp::Sym<size, big_endian> sym(symbuf);
 560   elfcpp::Sym_write<size, big_endian> osym(symbuf);
 561
 562   typedef typename elfcpp::Elf_types<size>::Elf_WXword Elf_size_type;
 563
 564   this->symbols_.resize(this->nsyms_);
 565
 566   for (int i = 0; i < this->nsyms_; ++i)
 567     {
 568       const struct ld_plugin_symbol *isym = &this->syms_[i];
 569       const char* name = isym->name;
 570       const char* ver = isym->version;
 571       elfcpp::Elf_Half shndx;
 572       elfcpp::STB bind;
 573       elfcpp::STV vis;
 574
 575       if (name != NULL && name[0] == '\0')
 576         name = NULL;
 577       if (ver != NULL && ver[0] == '\0')
 578         ver = NULL;
 579
 580       switch (isym->def)
 581         {
 582         case LDPK_WEAKDEF:
 583         case LDPK_WEAKUNDEF:
 584           bind = elfcpp::STB_WEAK;
 585           break;
 586         case LDPK_DEF:
 587         case LDPK_UNDEF:
 588         case LDPK_COMMON:
 589         default:
 590           bind = elfcpp::STB_GLOBAL;
 591           break;
 592         }
 593
 594       switch (isym->def)
 595         {
 596         case LDPK_DEF:
 597         case LDPK_WEAKDEF:
 598           shndx = elfcpp::SHN_ABS;
 599           break;
 600         case LDPK_COMMON:
 601           shndx = elfcpp::SHN_COMMON;
 602           break;
 603         case LDPK_UNDEF:
 604         case LDPK_WEAKUNDEF:
 605         default:
 606           shndx = elfcpp::SHN_UNDEF;
 607           break;
 608         }
 609
 610       switch (isym->visibility)
 611         {
 612         case LDPV_PROTECTED:
 613           vis = elfcpp::STV_DEFAULT;
 614           break;
 615         case LDPV_INTERNAL:
 616           vis = elfcpp::STV_DEFAULT;
 617           break;
 618         case LDPV_HIDDEN:
 619           vis = elfcpp::STV_DEFAULT;
 620           break;
 621         case LDPV_DEFAULT:
 622         default:
 623           vis = elfcpp::STV_DEFAULT;
 624           break;
 625         }
 626
 627       if (isym->comdat_key != NULL
 628           && isym->comdat_key[0] != '\0'
 629           && !this->include_comdat_group(isym->comdat_key, layout))
 630         shndx = elfcpp::SHN_UNDEF;
 631
 632       osym.put_st_name(0);
 633       osym.put_st_value(0);
 634       osym.put_st_size(static_cast<Elf_size_type>(isym->size));
 635       osym.put_st_info(bind, elfcpp::STT_NOTYPE);
 636       osym.put_st_other(vis, 0);
 637       osym.put_st_shndx(shndx);
 638
 639       this->symbols_[i] =
 640         symtab->add_from_pluginobj<size, big_endian>(this, name, ver, &sym);
 641     }
 642 }
 643
 644 // Get the size of a section.  Not used for plugin objects.
 645
 646 template<int size, bool big_endian>
 647 uint64_t
 648 Sized_pluginobj<size, big_endian>::do_section_size(unsigned int)
 649 {
 650   gold_unreachable();
 651   return 0;
 652 }
 653
 654 // Get the name of a section.  Not used for plugin objects.
 655
 656 template<int size, bool big_endian>
 657 std::string
 658 Sized_pluginobj<size, big_endian>::do_section_name(unsigned int)
 659 {
 660   gold_unreachable();
 661   return std::string();
 662 }
 663
 664 // Return a view of the contents of a section.  Not used for plugin objects.
 665
 666 template<int size, bool big_endian>
 667 Object::Location
 668 Sized_pluginobj<size, big_endian>::do_section_contents(unsigned int)
 669 {
 670   Location loc(0, 0);
 671
 672   gold_unreachable();
 673   return loc;
 674 }
 675
 676 // Return section flags.  Not used for plugin objects.
 677
 678 template<int size, bool big_endian>
 679 uint64_t
 680 Sized_pluginobj<size, big_endian>::do_section_flags(unsigned int)
 681 {
 682   gold_unreachable();
 683   return 0;
 684 }
 685
 686 // Return section address.  Not used for plugin objects.
 687
 688 template<int size, bool big_endian>
 689 uint64_t
 690 Sized_pluginobj<size, big_endian>::do_section_address(unsigned int)
 691 {
 692   gold_unreachable();
 693   return 0;
 694 }
 695
 696 // Return section type.  Not used for plugin objects.
 697
 698 template<int size, bool big_endian>
 699 unsigned int
 700 Sized_pluginobj<size, big_endian>::do_section_type(unsigned int)
 701 {
 702   gold_unreachable();
 703   return 0;
 704 }
 705
 706 // Return the section link field.  Not used for plugin objects.
 707
 708 template<int size, bool big_endian>
 709 unsigned int
 710 Sized_pluginobj<size, big_endian>::do_section_link(unsigned int)
 711 {
 712   gold_unreachable();
 713   return 0;
 714 }
 715
 716 // Return the section link field.  Not used for plugin objects.
 717
 718 template<int size, bool big_endian>
 719 unsigned int
 720 Sized_pluginobj<size, big_endian>::do_section_info(unsigned int)
 721 {
 722   gold_unreachable();
 723   return 0;
 724 }
 725
 726 // Return the section alignment.  Not used for plugin objects.
 727
 728 template<int size, bool big_endian>
 729 uint64_t
 730 Sized_pluginobj<size, big_endian>::do_section_addralign(unsigned int)
 731 {
 732   gold_unreachable();
 733   return 0;
 734 }
 735
 736 // Return the Xindex structure to use.  Not used for plugin objects.
 737
 738 template<int size, bool big_endian>
 739 Xindex*
 740 Sized_pluginobj<size, big_endian>::do_initialize_xindex()
 741 {
 742   gold_unreachable();
 743   return NULL;
 744 }
 745
 746 // Get symbol counts.  Not used for plugin objects.
 747
 748 template<int size, bool big_endian>
 749 void
 750 Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(const Symbol_table*,
 751                                                    size_t*, size_t*) const
 752 {
 753   gold_unreachable();
 754 }
 755
 756 // Class Plugin_finish.  This task runs after all replacement files have
 757 // been added.  It calls each plugin's cleanup handler.
 758
 759 class Plugin_finish : public Task
 760 {
 761  public:
 762   Plugin_finish(Task_token* this_blocker, Task_token* next_blocker)
 763     : this_blocker_(this_blocker), next_blocker_(next_blocker)
 764   { }
 765
 766   ~Plugin_finish()
 767   {
 768     if (this->this_blocker_ != NULL)
 769       delete this->this_blocker_;
 770   }
 771
 772   Task_token*
 773   is_runnable()
 774   {
 775     if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 776       return this->this_blocker_;
 777     return NULL;
 778   }
 779
 780   void
 781   locks(Task_locker* tl)
 782   { tl->add(this, this->next_blocker_); }
 783
 784   void
 785   run(Workqueue*)
 786   {
 787     Plugin_manager* plugins = parameters->options().plugins();
 788     gold_assert(plugins != NULL);
 789     plugins->cleanup();
 790   }
 791
 792   std::string
 793   get_name() const
 794   { return "Plugin_finish"; }
 795
 796  private:
 797   Task_token* this_blocker_;
 798   Task_token* next_blocker_;
 799 };
 800
 801 // Class Plugin_hook.
 802
 803 Plugin_hook::~Plugin_hook()
 804 {
 805 }
 806
 807 // Return whether a Plugin_hook task is runnable.
 808
 809 Task_token*
 810 Plugin_hook::is_runnable()
 811 {
 812   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 813     return this->this_blocker_;
 814   return NULL;
 815 }
 816
 817 // Return a Task_locker for a Plugin_hook task.  We don't need any
 818 // locks here.
 819
 820 void
 821 Plugin_hook::locks(Task_locker*)
 822 {
 823 }
 824
 825 // Run the "all symbols read" plugin hook.
 826
 827 void
 828 Plugin_hook::run(Workqueue* workqueue)
 829 {
 830   gold_assert(this->options_.has_plugins());
 831   this->options_.plugins()->all_symbols_read(workqueue,
 832                                              this,
 833                                              this->input_objects_,
 834                                              this->symtab_,
 835                                              this->layout_,
 836                                              this->dirpath_,
 837                                              this->mapfile_,
 838                                              &this->this_blocker_);
 839   workqueue->queue_soon(new Plugin_finish(this->this_blocker_,
 840                                           this->next_blocker_));
 841 }
 842
 843 // The C interface routines called by the plugins.
 844
 845 #ifdef ENABLE_PLUGINS
 846
 847 // Register a claim-file handler.
 848
 849 static enum ld_plugin_status
 850 register_claim_file(ld_plugin_claim_file_handler handler)
 851 {
 852   gold_assert(parameters->options().has_plugins());
 853   parameters->options().plugins()->set_claim_file_handler(handler);
 854   return LDPS_OK;
 855 }
 856
 857 // Register an all-symbols-read handler.
 858
 859 static enum ld_plugin_status
 860 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler)
 861 {
 862   gold_assert(parameters->options().has_plugins());
 863   parameters->options().plugins()->set_all_symbols_read_handler(handler);
 864   return LDPS_OK;
 865 }
 866
 867 // Register a cleanup handler.
 868
 869 static enum ld_plugin_status
 870 register_cleanup(ld_plugin_cleanup_handler handler)
 871 {
 872   gold_assert(parameters->options().has_plugins());
 873   parameters->options().plugins()->set_cleanup_handler(handler);
 874   return LDPS_OK;
 875 }
 876
 877 // Add symbols from a plugin-claimed input file.
 878
 879 static enum ld_plugin_status
 880 add_symbols(void* handle, int nsyms, const ld_plugin_symbol *syms)
 881 {
 882   gold_assert(parameters->options().has_plugins());
 883   Pluginobj* obj = parameters->options().plugins()->make_plugin_object(
 884       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
 885   if (obj == NULL)
 886     return LDPS_ERR;
 887   obj->store_incoming_symbols(nsyms, syms);
 888   return LDPS_OK;
 889 }
 890
 891 // Get the input file information with an open (possibly re-opened)
 892 // file descriptor.
 893
 894 static enum ld_plugin_status
 895 get_input_file(const void *handle, struct ld_plugin_input_file *file)
 896 {
 897   gold_assert(parameters->options().has_plugins());
 898   unsigned int obj_index =
 899       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
 900   return parameters->options().plugins()->get_input_file(obj_index, file);
 901 }
 902
 903 // Release the input file.
 904
 905 static enum ld_plugin_status
 906 release_input_file(const void *handle)
 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()->release_input_file(obj_index);
 912 }
 913
 914 // Get the symbol resolution info for a plugin-claimed input file.
 915
 916 static enum ld_plugin_status
 917 get_symbols(const void * handle, int nsyms, ld_plugin_symbol* syms)
 918 {
 919   gold_assert(parameters->options().has_plugins());
 920   Pluginobj* obj = parameters->options().plugins()->object(
 921       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
 922   if (obj == NULL)
 923     return LDPS_ERR;
 924   return obj->get_symbol_resolution_info(nsyms, syms);
 925 }
 926
 927 // Add a new (real) input file generated by a plugin.
 928
 929 static enum ld_plugin_status
 930 add_input_file(char *pathname)
 931 {
 932   gold_assert(parameters->options().has_plugins());
 933   return parameters->options().plugins()->add_input_file(pathname);
 934 }
 935
 936 // Issue a diagnostic message from a plugin.
 937
 938 static enum ld_plugin_status
 939 message(int level, const char * format, ...)
 940 {
 941   va_list args;
 942   va_start(args, format);
 943
 944   switch (level)
 945     {
 946     case LDPL_INFO:
 947       parameters->errors()->info(format, args);
 948       break;
 949     case LDPL_WARNING:
 950       parameters->errors()->warning(format, args);
 951       break;
 952     case LDPL_ERROR:
 953     default:
 954       parameters->errors()->error(format, args);
 955       break;
 956     case LDPL_FATAL:
 957       parameters->errors()->fatal(format, args);
 958       break;
 959     }
 960
 961   va_end(args);
 962   return LDPS_OK;
 963 }
 964
 965 #endif // ENABLE_PLUGINS
 966
 967 // Allocate a Pluginobj object of the appropriate size and endianness.
 968
 969 static Pluginobj*
 970 make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize)
 971 {
 972   Target* target;
 973   Pluginobj* obj = NULL;
 974
 975   if (parameters->target_valid())
 976     target = const_cast<Target*>(&parameters->target());
 977   else
 978     target = const_cast<Target*>(&parameters->default_target());
 979
 980   if (target->get_size() == 32)
 981     {
 982       if (target->is_big_endian())
 983 #ifdef HAVE_TARGET_32_BIG
 984         obj = new Sized_pluginobj<32, true>(input_file->filename(),
 985                                             input_file, offset, filesize);
 986 #else
 987         gold_error(_("%s: not configured to support "
 988                      "32-bit big-endian object"),
 989                    input_file->filename().c_str());
 990 #endif
 991       else
 992 #ifdef HAVE_TARGET_32_LITTLE
 993         obj = new Sized_pluginobj<32, false>(input_file->filename(),
 994                                              input_file, offset, filesize);
 995 #else
 996         gold_error(_("%s: not configured to support "
 997                      "32-bit little-endian object"),
 998                    input_file->filename().c_str());
 999 #endif
1000     }
1001   else if (target->get_size() == 64)
1002     {
1003       if (target->is_big_endian())
1004 #ifdef HAVE_TARGET_64_BIG
1005         obj = new Sized_pluginobj<64, true>(input_file->filename(),
1006                                             input_file, offset, filesize);
1007 #else
1008         gold_error(_("%s: not configured to support "
1009                      "64-bit big-endian object"),
1010                    input_file->filename().c_str());
1011 #endif
1012       else
1013 #ifdef HAVE_TARGET_64_LITTLE
1014         obj = new Sized_pluginobj<64, false>(input_file->filename(),
1015                                              input_file, offset, filesize);
1016 #else
1017         gold_error(_("%s: not configured to support "
1018                      "64-bit little-endian object"),
1019                    input_file->filename().c_str());
1020 #endif
1021     }
1022
1023   gold_assert(obj != NULL);
1024   obj->set_target(target);
1025   return obj;
1026 }
1027
1028 } // End namespace gold.