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
  29 #ifdef ENABLE_PLUGINS
  30 #include <dlfcn.h>
  31 #endif
  32
  33 #include "gold.h"
  34 #include "parameters.h"
  35 #include "errors.h"
  36 #include "fileread.h"
  37 #include "layout.h"
  38 #include "options.h"
  39 #include "plugin.h"
  40 #include "target.h"
  41 #include "readsyms.h"
  42 #include "symtab.h"
  43 #include "elfcpp.h"
  44
  45 namespace gold
  46 {
  47
  48 #ifdef ENABLE_PLUGINS
  49
  50 // The linker's exported interfaces.
  51
  52 extern "C"
  53 {
  54
  55 static enum ld_plugin_status
  56 register_claim_file(ld_plugin_claim_file_handler handler);
  57
  58 static enum ld_plugin_status
  59 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler);
  60
  61 static enum ld_plugin_status
  62 register_cleanup(ld_plugin_cleanup_handler handler);
  63
  64 static enum ld_plugin_status
  65 add_symbols(void *handle, int nsyms, const struct ld_plugin_symbol *syms);
  66
  67 static enum ld_plugin_status
  68 get_input_file(const void *handle, struct ld_plugin_input_file *file);
  69
  70 static enum ld_plugin_status
  71 release_input_file(const void *handle);
  72
  73 static enum ld_plugin_status
  74 get_symbols(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
  75
  76 static enum ld_plugin_status
  77 add_input_file(char *pathname);
  78
  79 static enum ld_plugin_status
  80 add_input_library(char *pathname);
  81
  82 static enum ld_plugin_status
  83 message(int level, const char *format, ...);
  84
  85 };
  86
  87 #endif // ENABLE_PLUGINS
  88
  89 static Pluginobj* make_sized_plugin_object(Input_file* input_file,
  90                                            off_t offset, off_t filesize);
  91
  92 // Plugin methods.
  93
  94 // Load one plugin library.
  95
  96 void
  97 Plugin::load()
  98 {
  99 #ifdef ENABLE_PLUGINS
 100   // Load the plugin library.
 101   // FIXME: Look for the library in standard locations.
 102   this->handle_ = dlopen(this->filename_.c_str(), RTLD_NOW);
 103   if (this->handle_ == NULL)
 104     {
 105       gold_error(_("%s: could not load plugin library"),
 106                  this->filename_.c_str());
 107       return;
 108     }
 109
 110   // Find the plugin's onload entry point.
 111   ld_plugin_onload onload = reinterpret_cast<ld_plugin_onload>
 112     (dlsym(this->handle_, "onload"));
 113   if (onload == NULL)
 114     {
 115       gold_error(_("%s: could not find onload entry point"),
 116                  this->filename_.c_str());
 117       return;
 118     }
 119
 120   // Get the linker's version number.
 121   const char* ver = get_version_string();
 122   int major = 0;
 123   int minor = 0;
 124   sscanf(ver, "%d.%d", &major, &minor);
 125
 126   // Allocate and populate a transfer vector.
 127   const int tv_fixed_size = 14;
 128   int tv_size = this->args_.size() + tv_fixed_size;
 129   ld_plugin_tv *tv = new ld_plugin_tv[tv_size];
 130
 131   // Put LDPT_MESSAGE at the front of the list so the plugin can use it
 132   // while processing subsequent entries.
 133   int i = 0;
 134   tv[i].tv_tag = LDPT_MESSAGE;
 135   tv[i].tv_u.tv_message = message;
 136
 137   ++i;
 138   tv[i].tv_tag = LDPT_API_VERSION;
 139   tv[i].tv_u.tv_val = LD_PLUGIN_API_VERSION;
 140
 141   ++i;
 142   tv[i].tv_tag = LDPT_GOLD_VERSION;
 143   tv[i].tv_u.tv_val = major * 100 + minor;
 144
 145   ++i;
 146   tv[i].tv_tag = LDPT_LINKER_OUTPUT;
 147   if (parameters->options().relocatable())
 148     tv[i].tv_u.tv_val = LDPO_REL;
 149   else if (parameters->options().shared())
 150     tv[i].tv_u.tv_val = LDPO_DYN;
 151   else
 152     tv[i].tv_u.tv_val = LDPO_EXEC;
 153
 154   for (unsigned int j = 0; j < this->args_.size(); ++j)
 155     {
 156       ++i;
 157       tv[i].tv_tag = LDPT_OPTION;
 158       tv[i].tv_u.tv_string = this->args_[j].c_str();
 159     }
 160
 161   ++i;
 162   tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
 163   tv[i].tv_u.tv_register_claim_file = register_claim_file;
 164
 165   ++i;
 166   tv[i].tv_tag = LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK;
 167   tv[i].tv_u.tv_register_all_symbols_read = register_all_symbols_read;
 168
 169   ++i;
 170   tv[i].tv_tag = LDPT_REGISTER_CLEANUP_HOOK;
 171   tv[i].tv_u.tv_register_cleanup = register_cleanup;
 172
 173   ++i;
 174   tv[i].tv_tag = LDPT_ADD_SYMBOLS;
 175   tv[i].tv_u.tv_add_symbols = add_symbols;
 176
 177   ++i;
 178   tv[i].tv_tag = LDPT_GET_INPUT_FILE;
 179   tv[i].tv_u.tv_get_input_file = get_input_file;
 180
 181   ++i;
 182   tv[i].tv_tag = LDPT_RELEASE_INPUT_FILE;
 183   tv[i].tv_u.tv_release_input_file = release_input_file;
 184
 185   ++i;
 186   tv[i].tv_tag = LDPT_GET_SYMBOLS;
 187   tv[i].tv_u.tv_get_symbols = get_symbols;
 188
 189   ++i;
 190   tv[i].tv_tag = LDPT_ADD_INPUT_FILE;
 191   tv[i].tv_u.tv_add_input_file = add_input_file;
 192
 193   ++i;
 194   tv[i].tv_tag = LDPT_ADD_INPUT_LIBRARY;
 195   tv[i].tv_u.tv_add_input_library = add_input_library;
 196
 197   ++i;
 198   tv[i].tv_tag = LDPT_NULL;
 199   tv[i].tv_u.tv_val = 0;
 200
 201   gold_assert(i == tv_size - 1);
 202
 203   // Call the onload entry point.
 204   (*onload)(tv);
 205
 206   delete[] tv;
 207 #endif // ENABLE_PLUGINS
 208 }
 209
 210 // Call the plugin claim-file handler.
 211
 212 inline bool
 213 Plugin::claim_file(struct ld_plugin_input_file *plugin_input_file)
 214 {
 215   int claimed = 0;
 216
 217   if (this->claim_file_handler_ != NULL)
 218     {
 219       (*this->claim_file_handler_)(plugin_input_file, &claimed);
 220       if (claimed)
 221         return true;
 222     }
 223   return false;
 224 }
 225
 226 // Call the all-symbols-read handler.
 227
 228 inline void
 229 Plugin::all_symbols_read()
 230 {
 231   if (this->all_symbols_read_handler_ != NULL)
 232     (*this->all_symbols_read_handler_)();
 233 }
 234
 235 // Call the cleanup handler.
 236
 237 inline void
 238 Plugin::cleanup()
 239 {
 240   if (this->cleanup_handler_ != NULL)
 241     (*this->cleanup_handler_)();
 242 }
 243
 244 // Plugin_manager methods.
 245
 246 Plugin_manager::~Plugin_manager()
 247 {
 248   for (Plugin_list::iterator p = this->plugins_.begin();
 249        p != this->plugins_.end();
 250        ++p)
 251     delete *p;
 252   this->plugins_.clear();
 253   for (Object_list::iterator obj = this->objects_.begin();
 254        obj != this->objects_.end();
 255        ++obj)
 256     delete *obj;
 257   this->objects_.clear();
 258 }
 259
 260 // Load all plugin libraries.
 261
 262 void
 263 Plugin_manager::load_plugins()
 264 {
 265   for (this->current_ = this->plugins_.begin();
 266        this->current_ != this->plugins_.end();
 267        ++this->current_)
 268     (*this->current_)->load();
 269 }
 270
 271 // Call the plugin claim-file handlers in turn to see if any claim the file.
 272
 273 Pluginobj*
 274 Plugin_manager::claim_file(Input_file* input_file, off_t offset,
 275                            off_t filesize)
 276 {
 277   if (this->in_replacement_phase_)
 278     return NULL;
 279
 280   unsigned int handle = this->objects_.size();
 281   this->input_file_ = input_file;
 282   this->plugin_input_file_.name = input_file->filename().c_str();
 283   this->plugin_input_file_.fd = input_file->file().descriptor();
 284   this->plugin_input_file_.offset = offset;
 285   this->plugin_input_file_.filesize = filesize;
 286   this->plugin_input_file_.handle = reinterpret_cast<void*>(handle);
 287
 288   for (this->current_ = this->plugins_.begin();
 289        this->current_ != this->plugins_.end();
 290        ++this->current_)
 291     {
 292       if ((*this->current_)->claim_file(&this->plugin_input_file_))
 293         {
 294           if (this->objects_.size() > handle)
 295             return this->objects_[handle];
 296
 297           // If the plugin claimed the file but did not call the
 298           // add_symbols callback, we need to create the Pluginobj now.
 299           Pluginobj* obj = this->make_plugin_object(handle);
 300           return obj;
 301         }
 302     }
 303
 304   return NULL;
 305 }
 306
 307 // Call the all-symbols-read handlers.
 308
 309 void
 310 Plugin_manager::all_symbols_read(Workqueue* workqueue, Task* task,
 311                                  Input_objects* input_objects,
 312                                  Symbol_table* symtab, Layout* layout,
 313                                  Dirsearch* dirpath, Mapfile* mapfile,
 314                                  Task_token** last_blocker)
 315 {
 316   this->in_replacement_phase_ = true;
 317   this->workqueue_ = workqueue;
 318   this->task_ = task;
 319   this->input_objects_ = input_objects;
 320   this->symtab_ = symtab;
 321   this->layout_ = layout;
 322   this->dirpath_ = dirpath;
 323   this->mapfile_ = mapfile;
 324   this->this_blocker_ = NULL;
 325
 326   for (this->current_ = this->plugins_.begin();
 327        this->current_ != this->plugins_.end();
 328        ++this->current_)
 329     (*this->current_)->all_symbols_read();
 330
 331   *last_blocker = this->this_blocker_;
 332 }
 333
 334 // Layout deferred objects.
 335
 336 void
 337 Plugin_manager::layout_deferred_objects()
 338 {
 339   Deferred_layout_list::iterator obj;
 340
 341   for (obj = this->deferred_layout_objects_.begin();
 342        obj != this->deferred_layout_objects_.end();
 343        ++obj)
 344     (*obj)->layout_deferred_sections(this->layout_);
 345 }
 346
 347 // Call the cleanup handlers.
 348
 349 void
 350 Plugin_manager::cleanup()
 351 {
 352   if (this->cleanup_done_)
 353     return;
 354   for (this->current_ = this->plugins_.begin();
 355        this->current_ != this->plugins_.end();
 356        ++this->current_)
 357     (*this->current_)->cleanup();
 358   this->cleanup_done_ = true;
 359 }
 360
 361 // Make a new Pluginobj object.  This is called when the plugin calls
 362 // the add_symbols API.
 363
 364 Pluginobj*
 365 Plugin_manager::make_plugin_object(unsigned int handle)
 366 {
 367   // Make sure we aren't asked to make an object for the same handle twice.
 368   if (this->objects_.size() != handle)
 369     return NULL;
 370
 371   Pluginobj* obj = make_sized_plugin_object(this->input_file_,
 372                                             this->plugin_input_file_.offset,
 373                                             this->plugin_input_file_.filesize);
 374   this->objects_.push_back(obj);
 375   return obj;
 376 }
 377
 378 // Get the input file information with an open (possibly re-opened)
 379 // file descriptor.
 380
 381 ld_plugin_status
 382 Plugin_manager::get_input_file(unsigned int handle,
 383                                struct ld_plugin_input_file *file)
 384 {
 385   Pluginobj* obj = this->object(handle);
 386   if (obj == NULL)
 387     return LDPS_BAD_HANDLE;
 388
 389   obj->lock(this->task_);
 390   file->name = obj->filename().c_str();
 391   file->fd = obj->descriptor();
 392   file->offset = obj->offset();
 393   file->filesize = obj->filesize();
 394   file->handle = reinterpret_cast<void*>(handle);
 395   return LDPS_OK;
 396 }
 397
 398 // Release the input file.
 399
 400 ld_plugin_status
 401 Plugin_manager::release_input_file(unsigned int handle)
 402 {
 403   Pluginobj* obj = this->object(handle);
 404   if (obj == NULL)
 405     return LDPS_BAD_HANDLE;
 406
 407   obj->unlock(this->task_);
 408   return LDPS_OK;
 409 }
 410
 411 // Add a new input file.
 412
 413 ld_plugin_status
 414 Plugin_manager::add_input_file(char *pathname, bool is_lib)
 415 {
 416   Input_file_argument file(pathname,
 417                            (is_lib
 418                             ? Input_file_argument::INPUT_FILE_TYPE_LIBRARY
 419                             : Input_file_argument::INPUT_FILE_TYPE_FILE),
 420                            "", false, this->options_);
 421   Input_argument* input_argument = new Input_argument(file);
 422   Task_token* next_blocker = new Task_token(true);
 423   next_blocker->add_blocker();
 424   if (this->layout_->incremental_inputs())
 425     gold_error(_("Input files added by plug-ins in --incremental mode not "
 426                  "supported yet.\n"));
 427   this->workqueue_->queue_soon(new Read_symbols(this->input_objects_,
 428                                                 this->symtab_,
 429                                                 this->layout_,
 430                                                 this->dirpath_,
 431                                                 0,
 432                                                 this->mapfile_,
 433                                                 input_argument,
 434                                                 NULL,
 435                                                 this->this_blocker_,
 436                                                 next_blocker));
 437   this->this_blocker_ = next_blocker;
 438   return LDPS_OK;
 439 }
 440
 441 // Class Pluginobj.
 442
 443 Pluginobj::Pluginobj(const std::string& name, Input_file* input_file,
 444                      off_t offset, off_t filesize)
 445   : Object(name, input_file, false, offset),
 446     nsyms_(0), syms_(NULL), symbols_(), filesize_(filesize), comdat_map_()
 447 {
 448 }
 449
 450 // Return TRUE if a defined symbol might be reachable from outside the
 451 // universe of claimed objects.
 452
 453 static inline bool
 454 is_visible_from_outside(Symbol* lsym)
 455 {
 456   if (lsym->in_real_elf())
 457     return true;
 458   if (parameters->options().relocatable())
 459     return true;
 460   if (parameters->options().export_dynamic() || parameters->options().shared())
 461     return lsym->is_externally_visible();
 462   return false;
 463 }
 464
 465 // Get symbol resolution info.
 466
 467 ld_plugin_status
 468 Pluginobj::get_symbol_resolution_info(int nsyms, ld_plugin_symbol* syms) const
 469 {
 470   if (nsyms > this->nsyms_)
 471     return LDPS_NO_SYMS;
 472   for (int i = 0; i < nsyms; i++)
 473     {
 474       ld_plugin_symbol* isym = &syms[i];
 475       Symbol* lsym = this->symbols_[i];
 476       ld_plugin_symbol_resolution res = LDPR_UNKNOWN;
 477
 478       if (lsym->is_undefined())
 479         // The symbol remains undefined.
 480         res = LDPR_UNDEF;
 481       else if (isym->def == LDPK_UNDEF
 482                || isym->def == LDPK_WEAKUNDEF
 483                || isym->def == LDPK_COMMON)
 484         {
 485           // The original symbol was undefined or common.
 486           if (lsym->source() != Symbol::FROM_OBJECT)
 487             res = LDPR_RESOLVED_EXEC;
 488           else if (lsym->object()->pluginobj() != NULL)
 489             res = LDPR_RESOLVED_IR;
 490           else if (lsym->object()->is_dynamic())
 491             res = LDPR_RESOLVED_DYN;
 492           else
 493             res = LDPR_RESOLVED_EXEC;
 494         }
 495       else
 496         {
 497           // The original symbol was a definition.
 498           if (lsym->source() != Symbol::FROM_OBJECT)
 499             res = LDPR_PREEMPTED_REG;
 500           else if (lsym->object() == static_cast<const Object*>(this))
 501             res = (is_visible_from_outside(lsym)
 502                    ? LDPR_PREVAILING_DEF
 503                    : LDPR_PREVAILING_DEF_IRONLY);
 504           else
 505             res = (lsym->object()->pluginobj() != NULL
 506                    ? LDPR_PREEMPTED_IR
 507                    : LDPR_PREEMPTED_REG);
 508         }
 509       isym->resolution = res;
 510     }
 511   return LDPS_OK;
 512 }
 513
 514 // Return TRUE if the comdat group with key COMDAT_KEY from this object
 515 // should be kept.
 516
 517 bool
 518 Pluginobj::include_comdat_group(std::string comdat_key, Layout* layout)
 519 {
 520   std::pair<Comdat_map::iterator, bool> ins =
 521     this->comdat_map_.insert(std::make_pair(comdat_key, false));
 522
 523   // If this is the first time we've seen this comdat key, ask the
 524   // layout object whether it should be included.
 525   if (ins.second)
 526     ins.first->second = layout->find_or_add_kept_section(comdat_key,
 527                                                          NULL, 0, true,
 528                                                          true, NULL);
 529
 530   return ins.first->second;
 531 }
 532
 533 // Class Sized_pluginobj.
 534
 535 template<int size, bool big_endian>
 536 Sized_pluginobj<size, big_endian>::Sized_pluginobj(
 537     const std::string& name,
 538     Input_file* input_file,
 539     off_t offset,
 540     off_t filesize)
 541   : Pluginobj(name, input_file, offset, filesize)
 542 {
 543 }
 544
 545 // Read the symbols.  Not used for plugin objects.
 546
 547 template<int size, bool big_endian>
 548 void
 549 Sized_pluginobj<size, big_endian>::do_read_symbols(Read_symbols_data*)
 550 {
 551   gold_unreachable();
 552 }
 553
 554 // Lay out the input sections.  Not used for plugin objects.
 555
 556 template<int size, bool big_endian>
 557 void
 558 Sized_pluginobj<size, big_endian>::do_layout(Symbol_table*, Layout*,
 559                                              Read_symbols_data*)
 560 {
 561   gold_unreachable();
 562 }
 563
 564 // Add the symbols to the symbol table.
 565
 566 template<int size, bool big_endian>
 567 void
 568 Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
 569                                                   Read_symbols_data*,
 570                                                   Layout* layout)
 571 {
 572   const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 573   unsigned char symbuf[sym_size];
 574   elfcpp::Sym<size, big_endian> sym(symbuf);
 575   elfcpp::Sym_write<size, big_endian> osym(symbuf);
 576
 577   typedef typename elfcpp::Elf_types<size>::Elf_WXword Elf_size_type;
 578
 579   this->symbols_.resize(this->nsyms_);
 580
 581   for (int i = 0; i < this->nsyms_; ++i)
 582     {
 583       const struct ld_plugin_symbol *isym = &this->syms_[i];
 584       const char* name = isym->name;
 585       const char* ver = isym->version;
 586       elfcpp::Elf_Half shndx;
 587       elfcpp::STB bind;
 588       elfcpp::STV vis;
 589
 590       if (name != NULL && name[0] == '\0')
 591         name = NULL;
 592       if (ver != NULL && ver[0] == '\0')
 593         ver = NULL;
 594
 595       switch (isym->def)
 596         {
 597         case LDPK_WEAKDEF:
 598         case LDPK_WEAKUNDEF:
 599           bind = elfcpp::STB_WEAK;
 600           break;
 601         case LDPK_DEF:
 602         case LDPK_UNDEF:
 603         case LDPK_COMMON:
 604         default:
 605           bind = elfcpp::STB_GLOBAL;
 606           break;
 607         }
 608
 609       switch (isym->def)
 610         {
 611         case LDPK_DEF:
 612         case LDPK_WEAKDEF:
 613           shndx = elfcpp::SHN_ABS;
 614           break;
 615         case LDPK_COMMON:
 616           shndx = elfcpp::SHN_COMMON;
 617           break;
 618         case LDPK_UNDEF:
 619         case LDPK_WEAKUNDEF:
 620         default:
 621           shndx = elfcpp::SHN_UNDEF;
 622           break;
 623         }
 624
 625       switch (isym->visibility)
 626         {
 627         case LDPV_PROTECTED:
 628           vis = elfcpp::STV_DEFAULT;
 629           break;
 630         case LDPV_INTERNAL:
 631           vis = elfcpp::STV_DEFAULT;
 632           break;
 633         case LDPV_HIDDEN:
 634           vis = elfcpp::STV_DEFAULT;
 635           break;
 636         case LDPV_DEFAULT:
 637         default:
 638           vis = elfcpp::STV_DEFAULT;
 639           break;
 640         }
 641
 642       if (isym->comdat_key != NULL
 643           && isym->comdat_key[0] != '\0'
 644           && !this->include_comdat_group(isym->comdat_key, layout))
 645         shndx = elfcpp::SHN_UNDEF;
 646
 647       osym.put_st_name(0);
 648       osym.put_st_value(0);
 649       osym.put_st_size(static_cast<Elf_size_type>(isym->size));
 650       osym.put_st_info(bind, elfcpp::STT_NOTYPE);
 651       osym.put_st_other(vis, 0);
 652       osym.put_st_shndx(shndx);
 653
 654       this->symbols_[i] =
 655         symtab->add_from_pluginobj<size, big_endian>(this, name, ver, &sym);
 656     }
 657 }
 658
 659 // Get the size of a section.  Not used for plugin objects.
 660
 661 template<int size, bool big_endian>
 662 uint64_t
 663 Sized_pluginobj<size, big_endian>::do_section_size(unsigned int)
 664 {
 665   gold_unreachable();
 666   return 0;
 667 }
 668
 669 // Get the name of a section.  Not used for plugin objects.
 670
 671 template<int size, bool big_endian>
 672 std::string
 673 Sized_pluginobj<size, big_endian>::do_section_name(unsigned int)
 674 {
 675   gold_unreachable();
 676   return std::string();
 677 }
 678
 679 // Return a view of the contents of a section.  Not used for plugin objects.
 680
 681 template<int size, bool big_endian>
 682 Object::Location
 683 Sized_pluginobj<size, big_endian>::do_section_contents(unsigned int)
 684 {
 685   Location loc(0, 0);
 686
 687   gold_unreachable();
 688   return loc;
 689 }
 690
 691 // Return section flags.  Not used for plugin objects.
 692
 693 template<int size, bool big_endian>
 694 uint64_t
 695 Sized_pluginobj<size, big_endian>::do_section_flags(unsigned int)
 696 {
 697   gold_unreachable();
 698   return 0;
 699 }
 700
 701 // Return section entsize.  Not used for plugin objects.
 702
 703 template<int size, bool big_endian>
 704 uint64_t
 705 Sized_pluginobj<size, big_endian>::do_section_entsize(unsigned int)
 706 {
 707   gold_unreachable();
 708   return 0;
 709 }
 710
 711 // Return section address.  Not used for plugin objects.
 712
 713 template<int size, bool big_endian>
 714 uint64_t
 715 Sized_pluginobj<size, big_endian>::do_section_address(unsigned int)
 716 {
 717   gold_unreachable();
 718   return 0;
 719 }
 720
 721 // Return section type.  Not used for plugin objects.
 722
 723 template<int size, bool big_endian>
 724 unsigned int
 725 Sized_pluginobj<size, big_endian>::do_section_type(unsigned int)
 726 {
 727   gold_unreachable();
 728   return 0;
 729 }
 730
 731 // Return the section link field.  Not used for plugin objects.
 732
 733 template<int size, bool big_endian>
 734 unsigned int
 735 Sized_pluginobj<size, big_endian>::do_section_link(unsigned int)
 736 {
 737   gold_unreachable();
 738   return 0;
 739 }
 740
 741 // Return the section link field.  Not used for plugin objects.
 742
 743 template<int size, bool big_endian>
 744 unsigned int
 745 Sized_pluginobj<size, big_endian>::do_section_info(unsigned int)
 746 {
 747   gold_unreachable();
 748   return 0;
 749 }
 750
 751 // Return the section alignment.  Not used for plugin objects.
 752
 753 template<int size, bool big_endian>
 754 uint64_t
 755 Sized_pluginobj<size, big_endian>::do_section_addralign(unsigned int)
 756 {
 757   gold_unreachable();
 758   return 0;
 759 }
 760
 761 // Return the Xindex structure to use.  Not used for plugin objects.
 762
 763 template<int size, bool big_endian>
 764 Xindex*
 765 Sized_pluginobj<size, big_endian>::do_initialize_xindex()
 766 {
 767   gold_unreachable();
 768   return NULL;
 769 }
 770
 771 // Get symbol counts.  Not used for plugin objects.
 772
 773 template<int size, bool big_endian>
 774 void
 775 Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(const Symbol_table*,
 776                                                    size_t*, size_t*) const
 777 {
 778   gold_unreachable();
 779 }
 780
 781 // Class Plugin_finish.  This task runs after all replacement files have
 782 // been added.  It calls each plugin's cleanup handler.
 783
 784 class Plugin_finish : public Task
 785 {
 786  public:
 787   Plugin_finish(Task_token* this_blocker, Task_token* next_blocker)
 788     : this_blocker_(this_blocker), next_blocker_(next_blocker)
 789   { }
 790
 791   ~Plugin_finish()
 792   {
 793     if (this->this_blocker_ != NULL)
 794       delete this->this_blocker_;
 795   }
 796
 797   Task_token*
 798   is_runnable()
 799   {
 800     if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 801       return this->this_blocker_;
 802     return NULL;
 803   }
 804
 805   void
 806   locks(Task_locker* tl)
 807   { tl->add(this, this->next_blocker_); }
 808
 809   void
 810   run(Workqueue*)
 811   {
 812     Plugin_manager* plugins = parameters->options().plugins();
 813     gold_assert(plugins != NULL);
 814     plugins->cleanup();
 815   }
 816
 817   std::string
 818   get_name() const
 819   { return "Plugin_finish"; }
 820
 821  private:
 822   Task_token* this_blocker_;
 823   Task_token* next_blocker_;
 824 };
 825
 826 // Class Plugin_hook.
 827
 828 Plugin_hook::~Plugin_hook()
 829 {
 830 }
 831
 832 // Return whether a Plugin_hook task is runnable.
 833
 834 Task_token*
 835 Plugin_hook::is_runnable()
 836 {
 837   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 838     return this->this_blocker_;
 839   return NULL;
 840 }
 841
 842 // Return a Task_locker for a Plugin_hook task.  We don't need any
 843 // locks here.
 844
 845 void
 846 Plugin_hook::locks(Task_locker*)
 847 {
 848 }
 849
 850 // Run the "all symbols read" plugin hook.
 851
 852 void
 853 Plugin_hook::run(Workqueue* workqueue)
 854 {
 855   gold_assert(this->options_.has_plugins());
 856   this->options_.plugins()->all_symbols_read(workqueue,
 857                                              this,
 858                                              this->input_objects_,
 859                                              this->symtab_,
 860                                              this->layout_,
 861                                              this->dirpath_,
 862                                              this->mapfile_,
 863                                              &this->this_blocker_);
 864   workqueue->queue_soon(new Plugin_finish(this->this_blocker_,
 865                                           this->next_blocker_));
 866 }
 867
 868 // The C interface routines called by the plugins.
 869
 870 #ifdef ENABLE_PLUGINS
 871
 872 // Register a claim-file handler.
 873
 874 static enum ld_plugin_status
 875 register_claim_file(ld_plugin_claim_file_handler handler)
 876 {
 877   gold_assert(parameters->options().has_plugins());
 878   parameters->options().plugins()->set_claim_file_handler(handler);
 879   return LDPS_OK;
 880 }
 881
 882 // Register an all-symbols-read handler.
 883
 884 static enum ld_plugin_status
 885 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler)
 886 {
 887   gold_assert(parameters->options().has_plugins());
 888   parameters->options().plugins()->set_all_symbols_read_handler(handler);
 889   return LDPS_OK;
 890 }
 891
 892 // Register a cleanup handler.
 893
 894 static enum ld_plugin_status
 895 register_cleanup(ld_plugin_cleanup_handler handler)
 896 {
 897   gold_assert(parameters->options().has_plugins());
 898   parameters->options().plugins()->set_cleanup_handler(handler);
 899   return LDPS_OK;
 900 }
 901
 902 // Add symbols from a plugin-claimed input file.
 903
 904 static enum ld_plugin_status
 905 add_symbols(void* handle, int nsyms, const ld_plugin_symbol *syms)
 906 {
 907   gold_assert(parameters->options().has_plugins());
 908   Pluginobj* obj = parameters->options().plugins()->make_plugin_object(
 909       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
 910   if (obj == NULL)
 911     return LDPS_ERR;
 912   obj->store_incoming_symbols(nsyms, syms);
 913   return LDPS_OK;
 914 }
 915
 916 // Get the input file information with an open (possibly re-opened)
 917 // file descriptor.
 918
 919 static enum ld_plugin_status
 920 get_input_file(const void *handle, struct ld_plugin_input_file *file)
 921 {
 922   gold_assert(parameters->options().has_plugins());
 923   unsigned int obj_index =
 924       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
 925   return parameters->options().plugins()->get_input_file(obj_index, file);
 926 }
 927
 928 // Release the input file.
 929
 930 static enum ld_plugin_status
 931 release_input_file(const void *handle)
 932 {
 933   gold_assert(parameters->options().has_plugins());
 934   unsigned int obj_index =
 935       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
 936   return parameters->options().plugins()->release_input_file(obj_index);
 937 }
 938
 939 // Get the symbol resolution info for a plugin-claimed input file.
 940
 941 static enum ld_plugin_status
 942 get_symbols(const void * handle, int nsyms, ld_plugin_symbol* syms)
 943 {
 944   gold_assert(parameters->options().has_plugins());
 945   Pluginobj* obj = parameters->options().plugins()->object(
 946       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
 947   if (obj == NULL)
 948     return LDPS_ERR;
 949   return obj->get_symbol_resolution_info(nsyms, syms);
 950 }
 951
 952 // Add a new (real) input file generated by a plugin.
 953
 954 static enum ld_plugin_status
 955 add_input_file(char *pathname)
 956 {
 957   gold_assert(parameters->options().has_plugins());
 958   return parameters->options().plugins()->add_input_file(pathname, false);
 959 }
 960
 961 // Add a new (real) library required by a plugin.
 962
 963 static enum ld_plugin_status
 964 add_input_library(char *pathname)
 965 {
 966   gold_assert(parameters->options().has_plugins());
 967   return parameters->options().plugins()->add_input_file(pathname, true);
 968 }
 969
 970 // Issue a diagnostic message from a plugin.
 971
 972 static enum ld_plugin_status
 973 message(int level, const char * format, ...)
 974 {
 975   va_list args;
 976   va_start(args, format);
 977
 978   switch (level)
 979     {
 980     case LDPL_INFO:
 981       parameters->errors()->info(format, args);
 982       break;
 983     case LDPL_WARNING:
 984       parameters->errors()->warning(format, args);
 985       break;
 986     case LDPL_ERROR:
 987     default:
 988       parameters->errors()->error(format, args);
 989       break;
 990     case LDPL_FATAL:
 991       parameters->errors()->fatal(format, args);
 992       break;
 993     }
 994
 995   va_end(args);
 996   return LDPS_OK;
 997 }
 998
 999 #endif // ENABLE_PLUGINS
1000
1001 // Allocate a Pluginobj object of the appropriate size and endianness.
1002
1003 static Pluginobj*
1004 make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize)
1005 {
1006   Pluginobj* obj = NULL;
1007
1008   parameters_force_valid_target();
1009   const Target& target(parameters->target());
1010
1011   if (target.get_size() == 32)
1012     {
1013       if (target.is_big_endian())
1014 #ifdef HAVE_TARGET_32_BIG
1015         obj = new Sized_pluginobj<32, true>(input_file->filename(),
1016                                             input_file, offset, filesize);
1017 #else
1018         gold_error(_("%s: not configured to support "
1019                      "32-bit big-endian object"),
1020                    input_file->filename().c_str());
1021 #endif
1022       else
1023 #ifdef HAVE_TARGET_32_LITTLE
1024         obj = new Sized_pluginobj<32, false>(input_file->filename(),
1025                                              input_file, offset, filesize);
1026 #else
1027         gold_error(_("%s: not configured to support "
1028                      "32-bit little-endian object"),
1029                    input_file->filename().c_str());
1030 #endif
1031     }
1032   else if (target.get_size() == 64)
1033     {
1034       if (target.is_big_endian())
1035 #ifdef HAVE_TARGET_64_BIG
1036         obj = new Sized_pluginobj<64, true>(input_file->filename(),
1037                                             input_file, offset, filesize);
1038 #else
1039         gold_error(_("%s: not configured to support "
1040                      "64-bit big-endian object"),
1041                    input_file->filename().c_str());
1042 #endif
1043       else
1044 #ifdef HAVE_TARGET_64_LITTLE
1045         obj = new Sized_pluginobj<64, false>(input_file->filename(),
1046                                              input_file, offset, filesize);
1047 #else
1048         gold_error(_("%s: not configured to support "
1049                      "64-bit little-endian object"),
1050                    input_file->filename().c_str());
1051 #endif
1052     }
1053
1054   gold_assert(obj != NULL);
1055   return obj;
1056 }
1057
1058 } // End namespace gold.