gold/plugin.cc

   1 // plugin.c -- plugin manager for gold      -*- C++ -*-
   2
   3 // Copyright 2008 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_symbols(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
  66
  67 static enum ld_plugin_status
  68 add_input_file(char *pathname);
  69
  70 static enum ld_plugin_status
  71 message(int level, const char *format, ...);
  72
  73 };
  74
  75 #endif // ENABLE_PLUGINS
  76
  77 static Pluginobj* make_sized_plugin_object(Input_file* input_file,
  78                                            off_t offset);
  79
  80 // Plugin methods.
  81
  82 // Load one plugin library.
  83
  84 void
  85 Plugin::load()
  86 {
  87 #ifdef ENABLE_PLUGINS
  88   std::string filename;
  89   std::vector<std::string> args;
  90
  91   // Parse the filename and arguments, each separated by commas.
  92   // FIXME:  Temporarily allowing semicolon as an argument separator
  93   // so args can be passed through gcc's -Wl,... option, which
  94   // breaks arguments at the commas.
  95   const char* p = this->args_;
  96   int n = strcspn(p, ",;");
  97   filename.assign(p, n);
  98   p += n;
  99   while (*p == ',' || *p == ';')
 100     {
 101       ++p;
 102       n = strcspn(p, ",;");
 103       args.push_back(std::string(p, n));
 104       p += n;
 105     }
 106
 107   // Load the plugin library.
 108   // FIXME: Look for the library in standard locations.
 109   this->handle_ = dlopen(filename.c_str(), RTLD_NOW);
 110   if (this->handle_ == NULL)
 111     {
 112       gold_error(_("%s: could not load plugin library"), filename.c_str());
 113       return;
 114     }
 115
 116   // Find the plugin's onload entry point.
 117   ld_plugin_onload onload = reinterpret_cast<ld_plugin_onload>
 118     (dlsym(this->handle_, "onload"));
 119   if (onload == NULL)
 120     {
 121       gold_error(_("%s: could not find onload entry point"), filename.c_str());
 122       return;
 123     }
 124
 125   // Get the linker's version number.
 126   const char* ver = get_version_string();
 127   int major = 0;
 128   int minor = 0;
 129   sscanf(ver, "%d.%d", &major, &minor);
 130
 131   // Allocate and populate a transfer vector.
 132   const int tv_fixed_size = 11;
 133   int tv_size = args.size() + tv_fixed_size;
 134   ld_plugin_tv *tv = new ld_plugin_tv[tv_size];
 135
 136   int i = 0;
 137   tv[i].tv_tag = LDPT_API_VERSION;
 138   tv[i].tv_u.tv_val = LD_PLUGIN_API_VERSION;
 139
 140   ++i;
 141   tv[i].tv_tag = LDPT_GOLD_VERSION;
 142   tv[i].tv_u.tv_val = major * 100 + minor;
 143
 144   ++i;
 145   tv[i].tv_tag = LDPT_LINKER_OUTPUT;
 146   if (parameters->options().relocatable())
 147     tv[i].tv_u.tv_val = LDPO_REL;
 148   else if (parameters->options().shared())
 149     tv[i].tv_u.tv_val = LDPO_DYN;
 150   else
 151     tv[i].tv_u.tv_val = LDPO_EXEC;
 152
 153   for (unsigned int j = 0; j < args.size(); ++j)
 154     {
 155       ++i;
 156       tv[i].tv_tag = LDPT_OPTION;
 157       tv[i].tv_u.tv_string = args[j].c_str();
 158     }
 159
 160   ++i;
 161   tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
 162   tv[i].tv_u.tv_register_claim_file = register_claim_file;
 163
 164   ++i;
 165   tv[i].tv_tag = LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK;
 166   tv[i].tv_u.tv_register_all_symbols_read = register_all_symbols_read;
 167
 168   ++i;
 169   tv[i].tv_tag = LDPT_REGISTER_CLEANUP_HOOK;
 170   tv[i].tv_u.tv_register_cleanup = register_cleanup;
 171
 172   ++i;
 173   tv[i].tv_tag = LDPT_ADD_SYMBOLS;
 174   tv[i].tv_u.tv_add_symbols = add_symbols;
 175
 176   ++i;
 177   tv[i].tv_tag = LDPT_GET_SYMBOLS;
 178   tv[i].tv_u.tv_get_symbols = get_symbols;
 179
 180   ++i;
 181   tv[i].tv_tag = LDPT_ADD_INPUT_FILE;
 182   tv[i].tv_u.tv_add_input_file = add_input_file;
 183
 184   ++i;
 185   tv[i].tv_tag = LDPT_MESSAGE;
 186   tv[i].tv_u.tv_message = message;
 187
 188   ++i;
 189   tv[i].tv_tag = LDPT_NULL;
 190   tv[i].tv_u.tv_val = 0;
 191
 192   gold_assert(i == tv_size - 1);
 193
 194   // Call the onload entry point.
 195   (*onload)(tv);
 196
 197   delete[] tv;
 198 #endif // ENABLE_PLUGINS
 199 }
 200
 201 // Call the plugin claim-file handler.
 202
 203 inline bool
 204 Plugin::claim_file(struct ld_plugin_input_file *plugin_input_file)
 205 {
 206   int claimed = 0;
 207
 208   if (this->claim_file_handler_ != NULL)
 209     {
 210       (*this->claim_file_handler_)(plugin_input_file, &claimed);
 211       if (claimed)
 212         return true;
 213     }
 214   return false;
 215 }
 216
 217 // Call the all-symbols-read handler.
 218
 219 inline void
 220 Plugin::all_symbols_read()
 221 {
 222   if (this->all_symbols_read_handler_ != NULL)
 223     (*this->all_symbols_read_handler_)();
 224 }
 225
 226 // Call the cleanup handler.
 227
 228 inline void
 229 Plugin::cleanup()
 230 {
 231   if (this->cleanup_handler_ != NULL)
 232     (*this->cleanup_handler_)();
 233 }
 234
 235 // Plugin_manager methods.
 236
 237 Plugin_manager::~Plugin_manager()
 238 {
 239   for (Plugin_list::iterator p = this->plugins_.begin();
 240        p != this->plugins_.end();
 241        ++p)
 242     delete *p;
 243   this->plugins_.clear();
 244   for (Object_list::iterator obj = this->objects_.begin();
 245        obj != this->objects_.end();
 246        ++obj)
 247     delete *obj;
 248   this->objects_.clear();
 249 }
 250
 251 // Load all plugin libraries.
 252
 253 void
 254 Plugin_manager::load_plugins()
 255 {
 256   for (this->current_ = this->plugins_.begin();
 257        this->current_ != this->plugins_.end();
 258        ++this->current_)
 259     (*this->current_)->load();
 260 }
 261
 262 // Call the plugin claim-file handlers in turn to see if any claim the file.
 263
 264 Pluginobj*
 265 Plugin_manager::claim_file(Input_file* input_file, off_t offset,
 266                            off_t filesize)
 267 {
 268   if (this->in_replacement_phase_)
 269     return NULL;
 270
 271   unsigned int handle = this->objects_.size();
 272   this->input_file_ = input_file;
 273   this->plugin_input_file_.name = input_file->filename().c_str();
 274   this->plugin_input_file_.fd = input_file->file().descriptor();
 275   this->plugin_input_file_.offset = offset;
 276   this->plugin_input_file_.filesize = filesize;
 277   this->plugin_input_file_.handle = reinterpret_cast<void*>(handle);
 278
 279   for (this->current_ = this->plugins_.begin();
 280        this->current_ != this->plugins_.end();
 281        ++this->current_)
 282     {
 283       if ((*this->current_)->claim_file(&this->plugin_input_file_))
 284         {
 285           if (this->objects_.size() <= handle)
 286             {
 287               gold_error(_("%s: plugin claimed the file "
 288                            "but did not provide any symbols"),
 289                          this->plugin_input_file_.name);
 290               return NULL;
 291             }
 292           return this->objects_[handle];
 293         }
 294     }
 295
 296   return NULL;
 297 }
 298
 299 // Call the all-symbols-read handlers.
 300
 301 void
 302 Plugin_manager::all_symbols_read(Workqueue* workqueue,
 303                                  Input_objects* input_objects,
 304                                  Symbol_table* symtab, Layout* layout,
 305                                  Dirsearch* dirpath, Mapfile* mapfile,
 306                                  Task_token** last_blocker)
 307 {
 308   this->in_replacement_phase_ = true;
 309   this->workqueue_ = workqueue;
 310   this->input_objects_ = input_objects;
 311   this->symtab_ = symtab;
 312   this->layout_ = layout;
 313   this->dirpath_ = dirpath;
 314   this->mapfile_ = mapfile;
 315   this->this_blocker_ = NULL;
 316
 317   for (this->current_ = this->plugins_.begin();
 318        this->current_ != this->plugins_.end();
 319        ++this->current_)
 320     (*this->current_)->all_symbols_read();
 321
 322   *last_blocker = this->this_blocker_;
 323 }
 324
 325 // Call the cleanup handlers.
 326
 327 void
 328 Plugin_manager::cleanup()
 329 {
 330   for (this->current_ = this->plugins_.begin();
 331        this->current_ != this->plugins_.end();
 332        ++this->current_)
 333     (*this->current_)->cleanup();
 334 }
 335
 336 // Make a new Pluginobj object.  This is called when the plugin calls
 337 // the add_symbols API.
 338
 339 Pluginobj*
 340 Plugin_manager::make_plugin_object(unsigned int handle)
 341 {
 342   // Make sure we aren't asked to make an object for the same handle twice.
 343   if (this->objects_.size() != handle)
 344     return NULL;
 345
 346   Pluginobj* obj = make_sized_plugin_object(this->input_file_,
 347                                             this->plugin_input_file_.offset);
 348   this->objects_.push_back(obj);
 349   return obj;
 350 }
 351
 352 // Add a new input file.
 353
 354 ld_plugin_status
 355 Plugin_manager::add_input_file(char *pathname)
 356 {
 357   Input_file_argument file(pathname, false, "", false, this->options_);
 358   Input_argument* input_argument = new Input_argument(file);
 359   Task_token* next_blocker = new Task_token(true);
 360   next_blocker->add_blocker();
 361   this->workqueue_->queue_soon(new Read_symbols(this->options_,
 362                                                 this->input_objects_,
 363                                                 this->symtab_,
 364                                                 this->layout_,
 365                                                 this->dirpath_,
 366                                                 this->mapfile_,
 367                                                 input_argument,
 368                                                 NULL,
 369                                                 this->this_blocker_,
 370                                                 next_blocker));
 371   this->this_blocker_ = next_blocker;
 372   return LDPS_OK;
 373 }
 374
 375 // Class Pluginobj.
 376
 377 Pluginobj::Pluginobj(const std::string& name, Input_file* input_file,
 378                      off_t offset)
 379   : Object(name, input_file, false, offset),
 380     nsyms_(0), syms_(NULL), symbols_(), comdat_map_()
 381 {
 382 }
 383
 384 // Get symbol resolution info.
 385
 386 ld_plugin_status
 387 Pluginobj::get_symbol_resolution_info(int nsyms, ld_plugin_symbol* syms) const
 388 {
 389   if (this->nsyms_ == 0)
 390     return LDPS_NO_SYMS;
 391   for (int i = 0; i < nsyms; i++)
 392     {
 393       ld_plugin_symbol* isym = &syms[i];
 394       Symbol* lsym = this->symbols_[i];
 395       ld_plugin_symbol_resolution res = LDPR_UNKNOWN;
 396
 397       if (lsym->is_undefined())
 398         // The symbol remains undefined.
 399         res = LDPR_UNDEF;
 400       else if (isym->def == LDPK_UNDEF
 401                || isym->def == LDPK_WEAKUNDEF
 402                || isym->def == LDPK_COMMON)
 403         {
 404           // The original symbol was undefined or common.
 405           if (lsym->source() != Symbol::FROM_OBJECT)
 406             res = LDPR_RESOLVED_EXEC;
 407           else if (lsym->object()->pluginobj() != NULL)
 408             res = LDPR_RESOLVED_IR;
 409           else if (lsym->object()->is_dynamic())
 410             res = LDPR_RESOLVED_DYN;
 411           else
 412             res = LDPR_RESOLVED_EXEC;
 413         }
 414       else
 415         {
 416           // The original symbol was a definition.
 417           if (lsym->source() != Symbol::FROM_OBJECT)
 418             res = LDPR_PREEMPTED_REG;
 419           else if (lsym->object() == static_cast<const Object*>(this))
 420             res = (lsym->in_real_elf()
 421                    ? LDPR_PREVAILING_DEF
 422                    : LDPR_PREVAILING_DEF_IRONLY);
 423           else
 424             res = (lsym->object()->pluginobj() != NULL
 425                    ? LDPR_PREEMPTED_IR
 426                    : LDPR_PREEMPTED_REG);
 427         }
 428       isym->resolution = res;
 429     }
 430   return LDPS_OK;
 431 }
 432
 433 // Return TRUE if the comdat group with key COMDAT_KEY from this object
 434 // should be kept.
 435
 436 bool
 437 Pluginobj::include_comdat_group(std::string comdat_key, Layout* layout)
 438 {
 439   std::pair<Comdat_map::iterator, bool> ins =
 440     this->comdat_map_.insert(std::make_pair(comdat_key, false));
 441
 442   // If this is the first time we've seen this comdat key, ask the
 443   // layout object whether it should be included.
 444   if (ins.second)
 445     ins.first->second = layout->add_comdat(NULL, 1, comdat_key, true);
 446
 447   return ins.first->second;
 448 }
 449
 450 // Class Sized_pluginobj.
 451
 452 template<int size, bool big_endian>
 453 Sized_pluginobj<size, big_endian>::Sized_pluginobj(
 454     const std::string& name,
 455     Input_file* input_file,
 456     off_t offset)
 457   : Pluginobj(name, input_file, offset)
 458 {
 459 }
 460
 461 // Read the symbols.  Not used for plugin objects.
 462
 463 template<int size, bool big_endian>
 464 void
 465 Sized_pluginobj<size, big_endian>::do_read_symbols(Read_symbols_data*)
 466 {
 467   gold_unreachable();
 468 }
 469
 470 // Lay out the input sections.  Not used for plugin objects.
 471
 472 template<int size, bool big_endian>
 473 void
 474 Sized_pluginobj<size, big_endian>::do_layout(Symbol_table*, Layout*,
 475                                              Read_symbols_data*)
 476 {
 477   gold_unreachable();
 478 }
 479
 480 // Add the symbols to the symbol table.
 481
 482 template<int size, bool big_endian>
 483 void
 484 Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table*,
 485                                                   Read_symbols_data*)
 486 {
 487   gold_unreachable();
 488 }
 489
 490 template<int size, bool big_endian>
 491 void
 492 Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
 493                                                   Layout* layout)
 494 {
 495   const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 496   unsigned char symbuf[sym_size];
 497   elfcpp::Sym<size, big_endian> sym(symbuf);
 498   elfcpp::Sym_write<size, big_endian> osym(symbuf);
 499
 500   typedef typename elfcpp::Elf_types<size>::Elf_WXword Elf_size_type;
 501
 502   this->symbols_.resize(this->nsyms_);
 503
 504   for (int i = 0; i < this->nsyms_; ++i)
 505     {
 506       const struct ld_plugin_symbol *isym = &this->syms_[i];
 507       const char* name = isym->name;
 508       const char* ver = isym->version;
 509       elfcpp::Elf_Half shndx;
 510       elfcpp::STB bind;
 511       elfcpp::STV vis;
 512
 513       if (name != NULL && name[0] == '\0')
 514         name = NULL;
 515       if (ver != NULL && ver[0] == '\0')
 516         ver = NULL;
 517
 518       switch (isym->def)
 519         {
 520         case LDPK_WEAKDEF:
 521         case LDPK_WEAKUNDEF:
 522           bind = elfcpp::STB_WEAK;
 523           break;
 524         case LDPK_DEF:
 525         case LDPK_UNDEF:
 526         case LDPK_COMMON:
 527         default:
 528           bind = elfcpp::STB_GLOBAL;
 529           break;
 530         }
 531
 532       switch (isym->def)
 533         {
 534         case LDPK_DEF:
 535         case LDPK_WEAKDEF:
 536           shndx = elfcpp::SHN_ABS;
 537           break;
 538         case LDPK_COMMON:
 539           shndx = elfcpp::SHN_COMMON;
 540           break;
 541         case LDPK_UNDEF:
 542         case LDPK_WEAKUNDEF:
 543         default:
 544           shndx = elfcpp::SHN_UNDEF;
 545           break;
 546         }
 547
 548       switch (isym->visibility)
 549         {
 550         case LDPV_PROTECTED:
 551           vis = elfcpp::STV_DEFAULT;
 552           break;
 553         case LDPV_INTERNAL:
 554           vis = elfcpp::STV_DEFAULT;
 555           break;
 556         case LDPV_HIDDEN:
 557           vis = elfcpp::STV_DEFAULT;
 558           break;
 559         case LDPV_DEFAULT:
 560         default:
 561           vis = elfcpp::STV_DEFAULT;
 562           break;
 563         }
 564
 565       if (isym->comdat_key != NULL
 566           && isym->comdat_key[0] != '\0'
 567           && !this->include_comdat_group(isym->comdat_key, layout))
 568         shndx = elfcpp::SHN_UNDEF;
 569
 570       osym.put_st_name(0);
 571       osym.put_st_value(0);
 572       osym.put_st_size(static_cast<Elf_size_type>(isym->size));
 573       osym.put_st_info(bind, elfcpp::STT_NOTYPE);
 574       osym.put_st_other(vis, 0);
 575       osym.put_st_shndx(shndx);
 576
 577       this->symbols_[i] =
 578         symtab->add_from_pluginobj<size, big_endian>(this, name, ver, &sym);
 579     }
 580 }
 581
 582 // Get the size of a section.  Not used for plugin objects.
 583
 584 template<int size, bool big_endian>
 585 uint64_t
 586 Sized_pluginobj<size, big_endian>::do_section_size(unsigned int)
 587 {
 588   gold_unreachable();
 589   return 0;
 590 }
 591
 592 // Get the name of a section.  Not used for plugin objects.
 593
 594 template<int size, bool big_endian>
 595 std::string
 596 Sized_pluginobj<size, big_endian>::do_section_name(unsigned int)
 597 {
 598   gold_unreachable();
 599   return std::string();
 600 }
 601
 602 // Return a view of the contents of a section.  Not used for plugin objects.
 603
 604 template<int size, bool big_endian>
 605 Object::Location
 606 Sized_pluginobj<size, big_endian>::do_section_contents(unsigned int)
 607 {
 608   Location loc(0, 0);
 609
 610   gold_unreachable();
 611   return loc;
 612 }
 613
 614 // Return section flags.  Not used for plugin objects.
 615
 616 template<int size, bool big_endian>
 617 uint64_t
 618 Sized_pluginobj<size, big_endian>::do_section_flags(unsigned int)
 619 {
 620   gold_unreachable();
 621   return 0;
 622 }
 623
 624 // Return section address.  Not used for plugin objects.
 625
 626 template<int size, bool big_endian>
 627 uint64_t
 628 Sized_pluginobj<size, big_endian>::do_section_address(unsigned int)
 629 {
 630   gold_unreachable();
 631   return 0;
 632 }
 633
 634 // Return section type.  Not used for plugin objects.
 635
 636 template<int size, bool big_endian>
 637 unsigned int
 638 Sized_pluginobj<size, big_endian>::do_section_type(unsigned int)
 639 {
 640   gold_unreachable();
 641   return 0;
 642 }
 643
 644 // Return the section link field.  Not used for plugin objects.
 645
 646 template<int size, bool big_endian>
 647 unsigned int
 648 Sized_pluginobj<size, big_endian>::do_section_link(unsigned int)
 649 {
 650   gold_unreachable();
 651   return 0;
 652 }
 653
 654 // Return the section link field.  Not used for plugin objects.
 655
 656 template<int size, bool big_endian>
 657 unsigned int
 658 Sized_pluginobj<size, big_endian>::do_section_info(unsigned int)
 659 {
 660   gold_unreachable();
 661   return 0;
 662 }
 663
 664 // Return the section alignment.  Not used for plugin objects.
 665
 666 template<int size, bool big_endian>
 667 uint64_t
 668 Sized_pluginobj<size, big_endian>::do_section_addralign(unsigned int)
 669 {
 670   gold_unreachable();
 671   return 0;
 672 }
 673
 674 // Return the Xindex structure to use.  Not used for plugin objects.
 675
 676 template<int size, bool big_endian>
 677 Xindex*
 678 Sized_pluginobj<size, big_endian>::do_initialize_xindex()
 679 {
 680   gold_unreachable();
 681   return NULL;
 682 }
 683
 684 // Get symbol counts.  Not used for plugin objects.
 685
 686 template<int size, bool big_endian>
 687 void
 688 Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(const Symbol_table*,
 689                                                    size_t*, size_t*) const
 690 {
 691   gold_unreachable();
 692 }
 693
 694 // Class Add_plugin_symbols.
 695
 696 Add_plugin_symbols::~Add_plugin_symbols()
 697 {
 698   if (this->this_blocker_ != NULL)
 699     delete this->this_blocker_;
 700   // next_blocker_ is deleted by the task associated with the next
 701   // input file.
 702 }
 703
 704 // We are blocked by this_blocker_.  We block next_blocker_.  We also
 705 // lock the file.
 706
 707 Task_token*
 708 Add_plugin_symbols::is_runnable()
 709 {
 710   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 711     return this->this_blocker_;
 712   if (this->obj_->is_locked())
 713     return this->obj_->token();
 714   return NULL;
 715 }
 716
 717 void
 718 Add_plugin_symbols::locks(Task_locker* tl)
 719 {
 720   tl->add(this, this->next_blocker_);
 721   tl->add(this, this->obj_->token());
 722 }
 723
 724 // Add the symbols in the object to the symbol table.
 725
 726 void
 727 Add_plugin_symbols::run(Workqueue*)
 728 {
 729   this->obj_->add_symbols(this->symtab_, this->layout_);
 730 }
 731
 732 // Class Plugin_cleanup.  This task calls the plugin cleanup hooks once all
 733 // replacement files have been added.
 734
 735 class Plugin_cleanup : public Task
 736 {
 737  public:
 738   Plugin_cleanup(Task_token* this_blocker, Task_token* next_blocker)
 739     : this_blocker_(this_blocker), next_blocker_(next_blocker)
 740   { }
 741
 742   ~Plugin_cleanup()
 743   {
 744     if (this->this_blocker_ != NULL)
 745       delete this->this_blocker_;
 746   }
 747
 748   Task_token*
 749   is_runnable()
 750   {
 751     if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 752       return this->this_blocker_;
 753     return NULL;
 754   }
 755
 756   void
 757   locks(Task_locker* tl)
 758   { tl->add(this, this->next_blocker_); }
 759
 760   void
 761   run(Workqueue*)
 762   { parameters->options().plugins()->cleanup(); }
 763
 764   std::string
 765   get_name() const
 766   { return "Plugin_cleanup"; }
 767
 768  private:
 769   Task_token* this_blocker_;
 770   Task_token* next_blocker_;
 771 };
 772
 773 // Class Plugin_hook.
 774
 775 Plugin_hook::~Plugin_hook()
 776 {
 777 }
 778
 779 // Return whether a Plugin_hook task is runnable.
 780
 781 Task_token*
 782 Plugin_hook::is_runnable()
 783 {
 784   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 785     return this->this_blocker_;
 786   return NULL;
 787 }
 788
 789 // Return a Task_locker for a Plugin_hook task.  We don't need any
 790 // locks here.
 791
 792 void
 793 Plugin_hook::locks(Task_locker*)
 794 {
 795 }
 796
 797 // Run a Plugin_hook task.
 798
 799 void
 800 Plugin_hook::run(Workqueue* workqueue)
 801 {
 802   this->do_plugin_hook(workqueue);
 803 }
 804
 805 // Run the "all symbols read" plugin hook.
 806
 807 void
 808 Plugin_hook::do_plugin_hook(Workqueue* workqueue)
 809 {
 810   gold_assert(this->options_.has_plugins());
 811   this->options_.plugins()->all_symbols_read(workqueue,
 812                                              this->input_objects_,
 813                                              this->symtab_,
 814                                              this->layout_,
 815                                              this->dirpath_,
 816                                              this->mapfile_,
 817                                              &this->this_blocker_);
 818   workqueue->queue_soon(new Plugin_cleanup(this->this_blocker_,
 819                                            this->next_blocker_));
 820 }
 821
 822 // The C interface routines called by the plugins.
 823
 824 #ifdef ENABLE_PLUGINS
 825
 826 // Register a claim-file handler.
 827
 828 static enum ld_plugin_status
 829 register_claim_file(ld_plugin_claim_file_handler handler)
 830 {
 831   gold_assert(parameters->options().has_plugins());
 832   parameters->options().plugins()->set_claim_file_handler(handler);
 833   return LDPS_OK;
 834 }
 835
 836 // Register an all-symbols-read handler.
 837
 838 static enum ld_plugin_status
 839 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler)
 840 {
 841   gold_assert(parameters->options().has_plugins());
 842   parameters->options().plugins()->set_all_symbols_read_handler(handler);
 843   return LDPS_OK;
 844 }
 845
 846 // Register a cleanup handler.
 847
 848 static enum ld_plugin_status
 849 register_cleanup(ld_plugin_cleanup_handler handler)
 850 {
 851   gold_assert(parameters->options().has_plugins());
 852   parameters->options().plugins()->set_cleanup_handler(handler);
 853   return LDPS_OK;
 854 }
 855
 856 // Add symbols from a plugin-claimed input file.
 857
 858 static enum ld_plugin_status
 859 add_symbols(void* handle, int nsyms, const ld_plugin_symbol *syms)
 860 {
 861   gold_assert(parameters->options().has_plugins());
 862   Pluginobj* obj = parameters->options().plugins()->make_plugin_object(
 863       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
 864   if (obj == NULL)
 865     return LDPS_ERR;
 866   obj->store_incoming_symbols(nsyms, syms);
 867   return LDPS_OK;
 868 }
 869
 870 // Get the symbol resolution info for a plugin-claimed input file.
 871
 872 static enum ld_plugin_status
 873 get_symbols(const void * handle, int nsyms, ld_plugin_symbol* syms)
 874 {
 875   gold_assert(parameters->options().has_plugins());
 876   Pluginobj* obj = parameters->options().plugins()->object(
 877       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
 878   if (obj == NULL)
 879     return LDPS_ERR;
 880   return obj->get_symbol_resolution_info(nsyms, syms);
 881 }
 882
 883 // Add a new (real) input file generated by a plugin.
 884
 885 static enum ld_plugin_status
 886 add_input_file(char *pathname)
 887 {
 888   gold_assert(parameters->options().has_plugins());
 889   return parameters->options().plugins()->add_input_file(pathname);
 890 }
 891
 892 // Issue a diagnostic message from a plugin.
 893
 894 static enum ld_plugin_status
 895 message(int level, const char * format, ...)
 896 {
 897   va_list args;
 898   va_start(args, format);
 899
 900   switch (level)
 901     {
 902     case LDPL_INFO:
 903       parameters->errors()->info(format, args);
 904       break;
 905     case LDPL_WARNING:
 906       parameters->errors()->warning(format, args);
 907       break;
 908     case LDPL_ERROR:
 909     default:
 910       parameters->errors()->error(format, args);
 911       break;
 912     case LDPL_FATAL:
 913       parameters->errors()->fatal(format, args);
 914       break;
 915     }
 916
 917   va_end(args);
 918   return LDPS_OK;
 919 }
 920
 921 #endif // ENABLE_PLUGINS
 922
 923 // Allocate a Pluginobj object of the appropriate size and endianness.
 924
 925 static Pluginobj*
 926 make_sized_plugin_object(Input_file* input_file, off_t offset)
 927 {
 928   Target* target;
 929   Pluginobj* obj = NULL;
 930
 931   if (parameters->target_valid())
 932     target = const_cast<Target*>(&parameters->target());
 933   else
 934     target = const_cast<Target*>(&parameters->default_target());
 935
 936   if (target->get_size() == 32)
 937     {
 938       if (target->is_big_endian())
 939 #ifdef HAVE_TARGET_32_BIG
 940         obj = new Sized_pluginobj<32, true>(input_file->filename(),
 941                                             input_file, offset);
 942 #else
 943         gold_error(_("%s: not configured to support "
 944                      "32-bit big-endian object"),
 945                    input_file->filename().c_str());
 946 #endif
 947       else
 948 #ifdef HAVE_TARGET_32_LITTLE
 949         obj = new Sized_pluginobj<32, false>(input_file->filename(),
 950                                              input_file, offset);
 951 #else
 952         gold_error(_("%s: not configured to support "
 953                      "32-bit little-endian object"),
 954                    input_file->filename().c_str());
 955 #endif
 956     }
 957   else if (target->get_size() == 64)
 958     {
 959       if (target->is_big_endian())
 960 #ifdef HAVE_TARGET_64_BIG
 961         obj = new Sized_pluginobj<64, true>(input_file->filename(),
 962                                             input_file, offset);
 963 #else
 964         gold_error(_("%s: not configured to support "
 965                      "64-bit big-endian object"),
 966                    input_file->filename().c_str());
 967 #endif
 968       else
 969 #ifdef HAVE_TARGET_64_LITTLE
 970         obj = new Sized_pluginobj<64, false>(input_file->filename(),
 971                                              input_file, offset);
 972 #else
 973         gold_error(_("%s: not configured to support "
 974                      "64-bit little-endian object"),
 975                    input_file->filename().c_str());
 976 #endif
 977     }
 978
 979   gold_assert(obj != NULL);
 980   obj->set_target(target);
 981   return obj;
 982 }
 983
 984 } // End namespace gold.