gold/plugin.cc

   1 // plugin.cc -- plugin manager for gold      -*- C++ -*-
   2
   3 // Copyright 2008, 2009, 2010 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 "gold.h"
  24
  25 #include <cstdio>
  26 #include <cstdarg>
  27 #include <cstring>
  28 #include <string>
  29 #include <vector>
  30
  31 #ifdef ENABLE_PLUGINS
  32 #include <dlfcn.h>
  33 #endif
  34
  35 #include "parameters.h"
  36 #include "errors.h"
  37 #include "fileread.h"
  38 #include "layout.h"
  39 #include "options.h"
  40 #include "plugin.h"
  41 #include "target.h"
  42 #include "readsyms.h"
  43 #include "symtab.h"
  44 #include "elfcpp.h"
  45
  46 namespace gold
  47 {
  48
  49 #ifdef ENABLE_PLUGINS
  50
  51 // The linker's exported interfaces.
  52
  53 extern "C"
  54 {
  55
  56 static enum ld_plugin_status
  57 register_claim_file(ld_plugin_claim_file_handler handler);
  58
  59 static enum ld_plugin_status
  60 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler);
  61
  62 static enum ld_plugin_status
  63 register_cleanup(ld_plugin_cleanup_handler handler);
  64
  65 static enum ld_plugin_status
  66 add_symbols(void *handle, int nsyms, const struct ld_plugin_symbol *syms);
  67
  68 static enum ld_plugin_status
  69 get_input_file(const void *handle, struct ld_plugin_input_file *file);
  70
  71 static enum ld_plugin_status
  72 release_input_file(const void *handle);
  73
  74 static enum ld_plugin_status
  75 get_symbols(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
  76
  77 static enum ld_plugin_status
  78 add_input_file(const char *pathname);
  79
  80 static enum ld_plugin_status
  81 add_input_library(const char *pathname);
  82
  83 static enum ld_plugin_status
  84 set_extra_library_path(const char *path);
  85
  86 static enum ld_plugin_status
  87 message(int level, const char *format, ...);
  88
  89 };
  90
  91 #endif // ENABLE_PLUGINS
  92
  93 static Pluginobj* make_sized_plugin_object(Input_file* input_file,
  94                                            off_t offset, off_t filesize);
  95
  96 // Plugin methods.
  97
  98 // Load one plugin library.
  99
 100 void
 101 Plugin::load()
 102 {
 103 #ifdef ENABLE_PLUGINS
 104   // Load the plugin library.
 105   // FIXME: Look for the library in standard locations.
 106   this->handle_ = dlopen(this->filename_.c_str(), RTLD_NOW);
 107   if (this->handle_ == NULL)
 108     {
 109       gold_error(_("%s: could not load plugin library: %s"),
 110                  this->filename_.c_str(), dlerror());
 111       return;
 112     }
 113
 114   // Find the plugin's onload entry point.
 115   void* ptr = dlsym(this->handle_, "onload");
 116   if (ptr == NULL)
 117     {
 118       gold_error(_("%s: could not find onload entry point"),
 119                  this->filename_.c_str());
 120       return;
 121     }
 122   ld_plugin_onload onload;
 123   gold_assert(sizeof(onload) == sizeof(ptr));
 124   memcpy(&onload, &ptr, sizeof(ptr));
 125
 126   // Get the linker's version number.
 127   const char* ver = get_version_string();
 128   int major = 0;
 129   int minor = 0;
 130   sscanf(ver, "%d.%d", &major, &minor);
 131
 132   // Allocate and populate a transfer vector.
 133   const int tv_fixed_size = 16;
 134   int tv_size = this->args_.size() + tv_fixed_size;
 135   ld_plugin_tv *tv = new ld_plugin_tv[tv_size];
 136
 137   // Put LDPT_MESSAGE at the front of the list so the plugin can use it
 138   // while processing subsequent entries.
 139   int i = 0;
 140   tv[i].tv_tag = LDPT_MESSAGE;
 141   tv[i].tv_u.tv_message = message;
 142
 143   ++i;
 144   tv[i].tv_tag = LDPT_API_VERSION;
 145   tv[i].tv_u.tv_val = LD_PLUGIN_API_VERSION;
 146
 147   ++i;
 148   tv[i].tv_tag = LDPT_GOLD_VERSION;
 149   tv[i].tv_u.tv_val = major * 100 + minor;
 150
 151   ++i;
 152   tv[i].tv_tag = LDPT_LINKER_OUTPUT;
 153   if (parameters->options().relocatable())
 154     tv[i].tv_u.tv_val = LDPO_REL;
 155   else if (parameters->options().shared())
 156     tv[i].tv_u.tv_val = LDPO_DYN;
 157   else
 158     tv[i].tv_u.tv_val = LDPO_EXEC;
 159
 160   ++i;
 161   tv[i].tv_tag = LDPT_OUTPUT_NAME;
 162   tv[i].tv_u.tv_string = parameters->options().output();
 163
 164   for (unsigned int j = 0; j < this->args_.size(); ++j)
 165     {
 166       ++i;
 167       tv[i].tv_tag = LDPT_OPTION;
 168       tv[i].tv_u.tv_string = this->args_[j].c_str();
 169     }
 170
 171   ++i;
 172   tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
 173   tv[i].tv_u.tv_register_claim_file = register_claim_file;
 174
 175   ++i;
 176   tv[i].tv_tag = LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK;
 177   tv[i].tv_u.tv_register_all_symbols_read = register_all_symbols_read;
 178
 179   ++i;
 180   tv[i].tv_tag = LDPT_REGISTER_CLEANUP_HOOK;
 181   tv[i].tv_u.tv_register_cleanup = register_cleanup;
 182
 183   ++i;
 184   tv[i].tv_tag = LDPT_ADD_SYMBOLS;
 185   tv[i].tv_u.tv_add_symbols = add_symbols;
 186
 187   ++i;
 188   tv[i].tv_tag = LDPT_GET_INPUT_FILE;
 189   tv[i].tv_u.tv_get_input_file = get_input_file;
 190
 191   ++i;
 192   tv[i].tv_tag = LDPT_RELEASE_INPUT_FILE;
 193   tv[i].tv_u.tv_release_input_file = release_input_file;
 194
 195   ++i;
 196   tv[i].tv_tag = LDPT_GET_SYMBOLS;
 197   tv[i].tv_u.tv_get_symbols = get_symbols;
 198
 199   ++i;
 200   tv[i].tv_tag = LDPT_ADD_INPUT_FILE;
 201   tv[i].tv_u.tv_add_input_file = add_input_file;
 202
 203   ++i;
 204   tv[i].tv_tag = LDPT_ADD_INPUT_LIBRARY;
 205   tv[i].tv_u.tv_add_input_library = add_input_library;
 206
 207   ++i;
 208   tv[i].tv_tag = LDPT_SET_EXTRA_LIBRARY_PATH;
 209   tv[i].tv_u.tv_set_extra_library_path = set_extra_library_path;
 210
 211   ++i;
 212   tv[i].tv_tag = LDPT_NULL;
 213   tv[i].tv_u.tv_val = 0;
 214
 215   gold_assert(i == tv_size - 1);
 216
 217   // Call the onload entry point.
 218   (*onload)(tv);
 219
 220   delete[] tv;
 221 #endif // ENABLE_PLUGINS
 222 }
 223
 224 // Call the plugin claim-file handler.
 225
 226 inline bool
 227 Plugin::claim_file(struct ld_plugin_input_file *plugin_input_file)
 228 {
 229   int claimed = 0;
 230
 231   if (this->claim_file_handler_ != NULL)
 232     {
 233       (*this->claim_file_handler_)(plugin_input_file, &claimed);
 234       if (claimed)
 235         return true;
 236     }
 237   return false;
 238 }
 239
 240 // Call the all-symbols-read handler.
 241
 242 inline void
 243 Plugin::all_symbols_read()
 244 {
 245   if (this->all_symbols_read_handler_ != NULL)
 246     (*this->all_symbols_read_handler_)();
 247 }
 248
 249 // Call the cleanup handler.
 250
 251 inline void
 252 Plugin::cleanup()
 253 {
 254   if (this->cleanup_handler_ != NULL && !this->cleanup_done_)
 255     {
 256       // Set this flag before calling to prevent a recursive plunge
 257       // in the event that a plugin's cleanup handler issues a
 258       // fatal error.
 259       this->cleanup_done_ = true;
 260       (*this->cleanup_handler_)();
 261     }
 262 }
 263
 264 // Plugin_manager methods.
 265
 266 Plugin_manager::~Plugin_manager()
 267 {
 268   for (Plugin_list::iterator p = this->plugins_.begin();
 269        p != this->plugins_.end();
 270        ++p)
 271     delete *p;
 272   this->plugins_.clear();
 273   for (Object_list::iterator obj = this->objects_.begin();
 274        obj != this->objects_.end();
 275        ++obj)
 276     delete *obj;
 277   this->objects_.clear();
 278 }
 279
 280 // Load all plugin libraries.
 281
 282 void
 283 Plugin_manager::load_plugins()
 284 {
 285   for (this->current_ = this->plugins_.begin();
 286        this->current_ != this->plugins_.end();
 287        ++this->current_)
 288     (*this->current_)->load();
 289 }
 290
 291 // Call the plugin claim-file handlers in turn to see if any claim the file.
 292
 293 Pluginobj*
 294 Plugin_manager::claim_file(Input_file* input_file, off_t offset,
 295                            off_t filesize)
 296 {
 297   if (this->in_replacement_phase_)
 298     return NULL;
 299
 300   unsigned int handle = this->objects_.size();
 301   this->input_file_ = input_file;
 302   this->plugin_input_file_.name = input_file->filename().c_str();
 303   this->plugin_input_file_.fd = input_file->file().descriptor();
 304   this->plugin_input_file_.offset = offset;
 305   this->plugin_input_file_.filesize = filesize;
 306   this->plugin_input_file_.handle = reinterpret_cast<void*>(handle);
 307
 308   for (this->current_ = this->plugins_.begin();
 309        this->current_ != this->plugins_.end();
 310        ++this->current_)
 311     {
 312       if ((*this->current_)->claim_file(&this->plugin_input_file_))
 313         {
 314           if (this->objects_.size() > handle)
 315             return this->objects_[handle];
 316
 317           // If the plugin claimed the file but did not call the
 318           // add_symbols callback, we need to create the Pluginobj now.
 319           Pluginobj* obj = this->make_plugin_object(handle);
 320           return obj;
 321         }
 322     }
 323
 324   return NULL;
 325 }
 326
 327 // Call the all-symbols-read handlers.
 328
 329 void
 330 Plugin_manager::all_symbols_read(Workqueue* workqueue, Task* task,
 331                                  Input_objects* input_objects,
 332                                  Symbol_table* symtab, Layout* layout,
 333                                  Dirsearch* dirpath, Mapfile* mapfile,
 334                                  Task_token** last_blocker)
 335 {
 336   this->in_replacement_phase_ = true;
 337   this->workqueue_ = workqueue;
 338   this->task_ = task;
 339   this->input_objects_ = input_objects;
 340   this->symtab_ = symtab;
 341   this->layout_ = layout;
 342   this->dirpath_ = dirpath;
 343   this->mapfile_ = mapfile;
 344   this->this_blocker_ = NULL;
 345
 346   for (this->current_ = this->plugins_.begin();
 347        this->current_ != this->plugins_.end();
 348        ++this->current_)
 349     (*this->current_)->all_symbols_read();
 350
 351   *last_blocker = this->this_blocker_;
 352 }
 353
 354 // Layout deferred objects.
 355
 356 void
 357 Plugin_manager::layout_deferred_objects()
 358 {
 359   Deferred_layout_list::iterator obj;
 360
 361   for (obj = this->deferred_layout_objects_.begin();
 362        obj != this->deferred_layout_objects_.end();
 363        ++obj)
 364     (*obj)->layout_deferred_sections(this->layout_);
 365 }
 366
 367 // Call the cleanup handlers.
 368
 369 void
 370 Plugin_manager::cleanup()
 371 {
 372   for (this->current_ = this->plugins_.begin();
 373        this->current_ != this->plugins_.end();
 374        ++this->current_)
 375     (*this->current_)->cleanup();
 376 }
 377
 378 // Make a new Pluginobj object.  This is called when the plugin calls
 379 // the add_symbols API.
 380
 381 Pluginobj*
 382 Plugin_manager::make_plugin_object(unsigned int handle)
 383 {
 384   // Make sure we aren't asked to make an object for the same handle twice.
 385   if (this->objects_.size() != handle)
 386     return NULL;
 387
 388   Pluginobj* obj = make_sized_plugin_object(this->input_file_,
 389                                             this->plugin_input_file_.offset,
 390                                             this->plugin_input_file_.filesize);
 391   this->objects_.push_back(obj);
 392   return obj;
 393 }
 394
 395 // Get the input file information with an open (possibly re-opened)
 396 // file descriptor.
 397
 398 ld_plugin_status
 399 Plugin_manager::get_input_file(unsigned int handle,
 400                                struct ld_plugin_input_file *file)
 401 {
 402   Pluginobj* obj = this->object(handle);
 403   if (obj == NULL)
 404     return LDPS_BAD_HANDLE;
 405
 406   obj->lock(this->task_);
 407   file->name = obj->filename().c_str();
 408   file->fd = obj->descriptor();
 409   file->offset = obj->offset();
 410   file->filesize = obj->filesize();
 411   file->handle = reinterpret_cast<void*>(handle);
 412   return LDPS_OK;
 413 }
 414
 415 // Release the input file.
 416
 417 ld_plugin_status
 418 Plugin_manager::release_input_file(unsigned int handle)
 419 {
 420   Pluginobj* obj = this->object(handle);
 421   if (obj == NULL)
 422     return LDPS_BAD_HANDLE;
 423
 424   obj->unlock(this->task_);
 425   return LDPS_OK;
 426 }
 427
 428 // Add a new library path.
 429
 430 ld_plugin_status
 431 Plugin_manager::set_extra_library_path(const char *path)
 432 {
 433   this->extra_search_path_ = std::string(path);
 434   return LDPS_OK;
 435 }
 436
 437 // Add a new input file.
 438
 439 ld_plugin_status
 440 Plugin_manager::add_input_file(const char *pathname, bool is_lib)
 441 {
 442   Input_file_argument file(pathname,
 443                            (is_lib
 444                             ? Input_file_argument::INPUT_FILE_TYPE_LIBRARY
 445                             : Input_file_argument::INPUT_FILE_TYPE_FILE),
 446                            (is_lib
 447                             ? this->extra_search_path_.c_str()
 448                             : ""),
 449                            false,
 450                            this->options_);
 451   Input_argument* input_argument = new Input_argument(file);
 452   Task_token* next_blocker = new Task_token(true);
 453   next_blocker->add_blocker();
 454   if (this->layout_->incremental_inputs())
 455     gold_error(_("input files added by plug-ins in --incremental mode not "
 456                  "supported yet"));
 457   this->workqueue_->queue_soon(new Read_symbols(this->input_objects_,
 458                                                 this->symtab_,
 459                                                 this->layout_,
 460                                                 this->dirpath_,
 461                                                 0,
 462                                                 this->mapfile_,
 463                                                 input_argument,
 464                                                 NULL,
 465                                                 NULL,
 466                                                 this->this_blocker_,
 467                                                 next_blocker));
 468   this->this_blocker_ = next_blocker;
 469   return LDPS_OK;
 470 }
 471
 472 // Class Pluginobj.
 473
 474 Pluginobj::Pluginobj(const std::string& name, Input_file* input_file,
 475                      off_t offset, off_t filesize)
 476   : Object(name, input_file, false, offset),
 477     nsyms_(0), syms_(NULL), symbols_(), filesize_(filesize), comdat_map_()
 478 {
 479 }
 480
 481 // Return TRUE if a defined symbol might be reachable from outside the
 482 // universe of claimed objects.
 483
 484 static inline bool
 485 is_visible_from_outside(Symbol* lsym)
 486 {
 487   if (lsym->in_real_elf())
 488     return true;
 489   if (parameters->options().relocatable())
 490     return true;
 491   if (parameters->options().export_dynamic() || parameters->options().shared())
 492     return lsym->is_externally_visible();
 493   return false;
 494 }
 495
 496 // Get symbol resolution info.
 497
 498 ld_plugin_status
 499 Pluginobj::get_symbol_resolution_info(int nsyms, ld_plugin_symbol* syms) const
 500 {
 501   if (nsyms > this->nsyms_)
 502     return LDPS_NO_SYMS;
 503
 504   if (static_cast<size_t>(nsyms) > this->symbols_.size())
 505     {
 506       // We never decided to include this object. We mark all symbols as
 507       // preempted.
 508       gold_assert (this->symbols_.size() == 0);
 509       for (int i = 0; i < nsyms; i++)
 510         syms[i].resolution = LDPR_PREEMPTED_REG;
 511       return LDPS_OK;
 512     }
 513
 514   for (int i = 0; i < nsyms; i++)
 515     {
 516       ld_plugin_symbol* isym = &syms[i];
 517       Symbol* lsym = this->symbols_[i];
 518       ld_plugin_symbol_resolution res = LDPR_UNKNOWN;
 519
 520       if (lsym->is_undefined())
 521         // The symbol remains undefined.
 522         res = LDPR_UNDEF;
 523       else if (isym->def == LDPK_UNDEF
 524                || isym->def == LDPK_WEAKUNDEF
 525                || isym->def == LDPK_COMMON)
 526         {
 527           // The original symbol was undefined or common.
 528           if (lsym->source() != Symbol::FROM_OBJECT)
 529             res = LDPR_RESOLVED_EXEC;
 530           else if (lsym->object()->pluginobj() == this)
 531             res = (is_visible_from_outside(lsym)
 532                    ? LDPR_PREVAILING_DEF
 533                    : LDPR_PREVAILING_DEF_IRONLY);
 534           else if (lsym->object()->pluginobj() != NULL)
 535             res = LDPR_RESOLVED_IR;
 536           else if (lsym->object()->is_dynamic())
 537             res = LDPR_RESOLVED_DYN;
 538           else
 539             res = LDPR_RESOLVED_EXEC;
 540         }
 541       else
 542         {
 543           // The original symbol was a definition.
 544           if (lsym->source() != Symbol::FROM_OBJECT)
 545             res = LDPR_PREEMPTED_REG;
 546           else if (lsym->object() == static_cast<const Object*>(this))
 547             res = (is_visible_from_outside(lsym)
 548                    ? LDPR_PREVAILING_DEF
 549                    : LDPR_PREVAILING_DEF_IRONLY);
 550           else
 551             res = (lsym->object()->pluginobj() != NULL
 552                    ? LDPR_PREEMPTED_IR
 553                    : LDPR_PREEMPTED_REG);
 554         }
 555       isym->resolution = res;
 556     }
 557   return LDPS_OK;
 558 }
 559
 560 // Return TRUE if the comdat group with key COMDAT_KEY from this object
 561 // should be kept.
 562
 563 bool
 564 Pluginobj::include_comdat_group(std::string comdat_key, Layout* layout)
 565 {
 566   std::pair<Comdat_map::iterator, bool> ins =
 567     this->comdat_map_.insert(std::make_pair(comdat_key, false));
 568
 569   // If this is the first time we've seen this comdat key, ask the
 570   // layout object whether it should be included.
 571   if (ins.second)
 572     ins.first->second = layout->find_or_add_kept_section(comdat_key,
 573                                                          NULL, 0, true,
 574                                                          true, NULL);
 575
 576   return ins.first->second;
 577 }
 578
 579 // Class Sized_pluginobj.
 580
 581 template<int size, bool big_endian>
 582 Sized_pluginobj<size, big_endian>::Sized_pluginobj(
 583     const std::string& name,
 584     Input_file* input_file,
 585     off_t offset,
 586     off_t filesize)
 587   : Pluginobj(name, input_file, offset, filesize)
 588 {
 589 }
 590
 591 // Read the symbols.  Not used for plugin objects.
 592
 593 template<int size, bool big_endian>
 594 void
 595 Sized_pluginobj<size, big_endian>::do_read_symbols(Read_symbols_data*)
 596 {
 597   gold_unreachable();
 598 }
 599
 600 // Lay out the input sections.  Not used for plugin objects.
 601
 602 template<int size, bool big_endian>
 603 void
 604 Sized_pluginobj<size, big_endian>::do_layout(Symbol_table*, Layout*,
 605                                              Read_symbols_data*)
 606 {
 607   gold_unreachable();
 608 }
 609
 610 // Add the symbols to the symbol table.
 611
 612 template<int size, bool big_endian>
 613 void
 614 Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
 615                                                   Read_symbols_data*,
 616                                                   Layout* layout)
 617 {
 618   const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 619   unsigned char symbuf[sym_size];
 620   elfcpp::Sym<size, big_endian> sym(symbuf);
 621   elfcpp::Sym_write<size, big_endian> osym(symbuf);
 622
 623   typedef typename elfcpp::Elf_types<size>::Elf_WXword Elf_size_type;
 624
 625   this->symbols_.resize(this->nsyms_);
 626
 627   for (int i = 0; i < this->nsyms_; ++i)
 628     {
 629       const struct ld_plugin_symbol *isym = &this->syms_[i];
 630       const char* name = isym->name;
 631       const char* ver = isym->version;
 632       elfcpp::Elf_Half shndx;
 633       elfcpp::STB bind;
 634       elfcpp::STV vis;
 635
 636       if (name != NULL && name[0] == '\0')
 637         name = NULL;
 638       if (ver != NULL && ver[0] == '\0')
 639         ver = NULL;
 640
 641       switch (isym->def)
 642         {
 643         case LDPK_WEAKDEF:
 644         case LDPK_WEAKUNDEF:
 645           bind = elfcpp::STB_WEAK;
 646           break;
 647         case LDPK_DEF:
 648         case LDPK_UNDEF:
 649         case LDPK_COMMON:
 650         default:
 651           bind = elfcpp::STB_GLOBAL;
 652           break;
 653         }
 654
 655       switch (isym->def)
 656         {
 657         case LDPK_DEF:
 658         case LDPK_WEAKDEF:
 659           shndx = elfcpp::SHN_ABS;
 660           break;
 661         case LDPK_COMMON:
 662           shndx = elfcpp::SHN_COMMON;
 663           break;
 664         case LDPK_UNDEF:
 665         case LDPK_WEAKUNDEF:
 666         default:
 667           shndx = elfcpp::SHN_UNDEF;
 668           break;
 669         }
 670
 671       switch (isym->visibility)
 672         {
 673         case LDPV_PROTECTED:
 674           vis = elfcpp::STV_PROTECTED;
 675           break;
 676         case LDPV_INTERNAL:
 677           vis = elfcpp::STV_INTERNAL;
 678           break;
 679         case LDPV_HIDDEN:
 680           vis = elfcpp::STV_HIDDEN;
 681           break;
 682         case LDPV_DEFAULT:
 683         default:
 684           vis = elfcpp::STV_DEFAULT;
 685           break;
 686         }
 687
 688       if (isym->comdat_key != NULL
 689           && isym->comdat_key[0] != '\0'
 690           && !this->include_comdat_group(isym->comdat_key, layout))
 691         shndx = elfcpp::SHN_UNDEF;
 692
 693       osym.put_st_name(0);
 694       osym.put_st_value(0);
 695       osym.put_st_size(static_cast<Elf_size_type>(isym->size));
 696       osym.put_st_info(bind, elfcpp::STT_NOTYPE);
 697       osym.put_st_other(vis, 0);
 698       osym.put_st_shndx(shndx);
 699
 700       this->symbols_[i] =
 701         symtab->add_from_pluginobj<size, big_endian>(this, name, ver, &sym);
 702     }
 703 }
 704
 705 template<int size, bool big_endian>
 706 Archive::Should_include
 707 Sized_pluginobj<size, big_endian>::do_should_include_member(
 708     Symbol_table* symtab, Read_symbols_data*, std::string* why)
 709 {
 710   char* tmpbuf = NULL;
 711   size_t tmpbuflen = 0;
 712
 713   for (int i = 0; i < this->nsyms_; ++i) {
 714     const struct ld_plugin_symbol& sym = this->syms_[i];
 715     const char* name = sym.name;
 716     Symbol* symbol;
 717     Archive::Should_include t = Archive::should_include_member(symtab, name,
 718                                                                &symbol, why,
 719                                                                &tmpbuf,
 720                                                                &tmpbuflen);
 721       if (t == Archive::SHOULD_INCLUDE_YES)
 722         {
 723           if (tmpbuf != NULL)
 724             free(tmpbuf);
 725           return t;
 726         }
 727   }
 728   if (tmpbuf != NULL)
 729     free(tmpbuf);
 730   return Archive::SHOULD_INCLUDE_UNKNOWN;
 731 }
 732
 733 // Get the size of a section.  Not used for plugin objects.
 734
 735 template<int size, bool big_endian>
 736 uint64_t
 737 Sized_pluginobj<size, big_endian>::do_section_size(unsigned int)
 738 {
 739   gold_unreachable();
 740   return 0;
 741 }
 742
 743 // Get the name of a section.  Not used for plugin objects.
 744
 745 template<int size, bool big_endian>
 746 std::string
 747 Sized_pluginobj<size, big_endian>::do_section_name(unsigned int)
 748 {
 749   gold_unreachable();
 750   return std::string();
 751 }
 752
 753 // Return a view of the contents of a section.  Not used for plugin objects.
 754
 755 template<int size, bool big_endian>
 756 Object::Location
 757 Sized_pluginobj<size, big_endian>::do_section_contents(unsigned int)
 758 {
 759   Location loc(0, 0);
 760
 761   gold_unreachable();
 762   return loc;
 763 }
 764
 765 // Return section flags.  Not used for plugin objects.
 766
 767 template<int size, bool big_endian>
 768 uint64_t
 769 Sized_pluginobj<size, big_endian>::do_section_flags(unsigned int)
 770 {
 771   gold_unreachable();
 772   return 0;
 773 }
 774
 775 // Return section entsize.  Not used for plugin objects.
 776
 777 template<int size, bool big_endian>
 778 uint64_t
 779 Sized_pluginobj<size, big_endian>::do_section_entsize(unsigned int)
 780 {
 781   gold_unreachable();
 782   return 0;
 783 }
 784
 785 // Return section address.  Not used for plugin objects.
 786
 787 template<int size, bool big_endian>
 788 uint64_t
 789 Sized_pluginobj<size, big_endian>::do_section_address(unsigned int)
 790 {
 791   gold_unreachable();
 792   return 0;
 793 }
 794
 795 // Return section type.  Not used for plugin objects.
 796
 797 template<int size, bool big_endian>
 798 unsigned int
 799 Sized_pluginobj<size, big_endian>::do_section_type(unsigned int)
 800 {
 801   gold_unreachable();
 802   return 0;
 803 }
 804
 805 // Return the section link field.  Not used for plugin objects.
 806
 807 template<int size, bool big_endian>
 808 unsigned int
 809 Sized_pluginobj<size, big_endian>::do_section_link(unsigned int)
 810 {
 811   gold_unreachable();
 812   return 0;
 813 }
 814
 815 // Return the section link field.  Not used for plugin objects.
 816
 817 template<int size, bool big_endian>
 818 unsigned int
 819 Sized_pluginobj<size, big_endian>::do_section_info(unsigned int)
 820 {
 821   gold_unreachable();
 822   return 0;
 823 }
 824
 825 // Return the section alignment.  Not used for plugin objects.
 826
 827 template<int size, bool big_endian>
 828 uint64_t
 829 Sized_pluginobj<size, big_endian>::do_section_addralign(unsigned int)
 830 {
 831   gold_unreachable();
 832   return 0;
 833 }
 834
 835 // Return the Xindex structure to use.  Not used for plugin objects.
 836
 837 template<int size, bool big_endian>
 838 Xindex*
 839 Sized_pluginobj<size, big_endian>::do_initialize_xindex()
 840 {
 841   gold_unreachable();
 842   return NULL;
 843 }
 844
 845 // Get symbol counts.  Not used for plugin objects.
 846
 847 template<int size, bool big_endian>
 848 void
 849 Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(const Symbol_table*,
 850                                                    size_t*, size_t*) const
 851 {
 852   gold_unreachable();
 853 }
 854
 855 // Get symbols.  Not used for plugin objects.
 856
 857 template<int size, bool big_endian>
 858 const Object::Symbols*
 859 Sized_pluginobj<size, big_endian>::do_get_global_symbols() const
 860 {
 861   gold_unreachable();
 862 }
 863
 864 // Class Plugin_finish.  This task runs after all replacement files have
 865 // been added.  For now, it's a placeholder for a possible plugin API
 866 // to allow the plugin to release most of its resources.  The cleanup
 867 // handlers must be called later, because they can remove the temporary
 868 // object files that are needed until the end of the link.
 869
 870 class Plugin_finish : public Task
 871 {
 872  public:
 873   Plugin_finish(Task_token* this_blocker, Task_token* next_blocker)
 874     : this_blocker_(this_blocker), next_blocker_(next_blocker)
 875   { }
 876
 877   ~Plugin_finish()
 878   {
 879     if (this->this_blocker_ != NULL)
 880       delete this->this_blocker_;
 881   }
 882
 883   Task_token*
 884   is_runnable()
 885   {
 886     if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 887       return this->this_blocker_;
 888     return NULL;
 889   }
 890
 891   void
 892   locks(Task_locker* tl)
 893   { tl->add(this, this->next_blocker_); }
 894
 895   void
 896   run(Workqueue*)
 897   {
 898     // We could call early cleanup handlers here.
 899   }
 900
 901   std::string
 902   get_name() const
 903   { return "Plugin_finish"; }
 904
 905  private:
 906   Task_token* this_blocker_;
 907   Task_token* next_blocker_;
 908 };
 909
 910 // Class Plugin_hook.
 911
 912 Plugin_hook::~Plugin_hook()
 913 {
 914 }
 915
 916 // Return whether a Plugin_hook task is runnable.
 917
 918 Task_token*
 919 Plugin_hook::is_runnable()
 920 {
 921   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 922     return this->this_blocker_;
 923   return NULL;
 924 }
 925
 926 // Return a Task_locker for a Plugin_hook task.  We don't need any
 927 // locks here.
 928
 929 void
 930 Plugin_hook::locks(Task_locker*)
 931 {
 932 }
 933
 934 // Run the "all symbols read" plugin hook.
 935
 936 void
 937 Plugin_hook::run(Workqueue* workqueue)
 938 {
 939   gold_assert(this->options_.has_plugins());
 940   Symbol* start_sym;
 941   if (parameters->options().entry())
 942     start_sym = this->symtab_->lookup(parameters->options().entry());
 943   else
 944     start_sym = this->symtab_->lookup("_start");
 945   if (start_sym != NULL)
 946     start_sym->set_in_real_elf();
 947
 948   this->options_.plugins()->all_symbols_read(workqueue,
 949                                              this,
 950                                              this->input_objects_,
 951                                              this->symtab_,
 952                                              this->layout_,
 953                                              this->dirpath_,
 954                                              this->mapfile_,
 955                                              &this->this_blocker_);
 956   workqueue->queue_soon(new Plugin_finish(this->this_blocker_,
 957                                           this->next_blocker_));
 958 }
 959
 960 // The C interface routines called by the plugins.
 961
 962 #ifdef ENABLE_PLUGINS
 963
 964 // Register a claim-file handler.
 965
 966 static enum ld_plugin_status
 967 register_claim_file(ld_plugin_claim_file_handler handler)
 968 {
 969   gold_assert(parameters->options().has_plugins());
 970   parameters->options().plugins()->set_claim_file_handler(handler);
 971   return LDPS_OK;
 972 }
 973
 974 // Register an all-symbols-read handler.
 975
 976 static enum ld_plugin_status
 977 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler)
 978 {
 979   gold_assert(parameters->options().has_plugins());
 980   parameters->options().plugins()->set_all_symbols_read_handler(handler);
 981   return LDPS_OK;
 982 }
 983
 984 // Register a cleanup handler.
 985
 986 static enum ld_plugin_status
 987 register_cleanup(ld_plugin_cleanup_handler handler)
 988 {
 989   gold_assert(parameters->options().has_plugins());
 990   parameters->options().plugins()->set_cleanup_handler(handler);
 991   return LDPS_OK;
 992 }
 993
 994 // Add symbols from a plugin-claimed input file.
 995
 996 static enum ld_plugin_status
 997 add_symbols(void* handle, int nsyms, const ld_plugin_symbol *syms)
 998 {
 999   gold_assert(parameters->options().has_plugins());
1000   Pluginobj* obj = parameters->options().plugins()->make_plugin_object(
1001       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
1002   if (obj == NULL)
1003     return LDPS_ERR;
1004   obj->store_incoming_symbols(nsyms, syms);
1005   return LDPS_OK;
1006 }
1007
1008 // Get the input file information with an open (possibly re-opened)
1009 // file descriptor.
1010
1011 static enum ld_plugin_status
1012 get_input_file(const void *handle, struct ld_plugin_input_file *file)
1013 {
1014   gold_assert(parameters->options().has_plugins());
1015   unsigned int obj_index =
1016       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
1017   return parameters->options().plugins()->get_input_file(obj_index, file);
1018 }
1019
1020 // Release the input file.
1021
1022 static enum ld_plugin_status
1023 release_input_file(const void *handle)
1024 {
1025   gold_assert(parameters->options().has_plugins());
1026   unsigned int obj_index =
1027       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
1028   return parameters->options().plugins()->release_input_file(obj_index);
1029 }
1030
1031 // Get the symbol resolution info for a plugin-claimed input file.
1032
1033 static enum ld_plugin_status
1034 get_symbols(const void * handle, int nsyms, ld_plugin_symbol* syms)
1035 {
1036   gold_assert(parameters->options().has_plugins());
1037   Pluginobj* obj = parameters->options().plugins()->object(
1038       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
1039   if (obj == NULL)
1040     return LDPS_ERR;
1041   return obj->get_symbol_resolution_info(nsyms, syms);
1042 }
1043
1044 // Add a new (real) input file generated by a plugin.
1045
1046 static enum ld_plugin_status
1047 add_input_file(const char *pathname)
1048 {
1049   gold_assert(parameters->options().has_plugins());
1050   return parameters->options().plugins()->add_input_file(pathname, false);
1051 }
1052
1053 // Add a new (real) library required by a plugin.
1054
1055 static enum ld_plugin_status
1056 add_input_library(const char *pathname)
1057 {
1058   gold_assert(parameters->options().has_plugins());
1059   return parameters->options().plugins()->add_input_file(pathname, true);
1060 }
1061
1062 // Set the extra library path to be used by libraries added via
1063 // add_input_library
1064
1065 static enum ld_plugin_status
1066 set_extra_library_path(const char *path)
1067 {
1068   gold_assert(parameters->options().has_plugins());
1069   return parameters->options().plugins()->set_extra_library_path(path);
1070 }
1071
1072 // Issue a diagnostic message from a plugin.
1073
1074 static enum ld_plugin_status
1075 message(int level, const char * format, ...)
1076 {
1077   va_list args;
1078   va_start(args, format);
1079
1080   switch (level)
1081     {
1082     case LDPL_INFO:
1083       parameters->errors()->info(format, args);
1084       break;
1085     case LDPL_WARNING:
1086       parameters->errors()->warning(format, args);
1087       break;
1088     case LDPL_ERROR:
1089     default:
1090       parameters->errors()->error(format, args);
1091       break;
1092     case LDPL_FATAL:
1093       parameters->errors()->fatal(format, args);
1094       break;
1095     }
1096
1097   va_end(args);
1098   return LDPS_OK;
1099 }
1100
1101 #endif // ENABLE_PLUGINS
1102
1103 // Allocate a Pluginobj object of the appropriate size and endianness.
1104
1105 static Pluginobj*
1106 make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize)
1107 {
1108   Pluginobj* obj = NULL;
1109
1110   parameters_force_valid_target();
1111   const Target& target(parameters->target());
1112
1113   if (target.get_size() == 32)
1114     {
1115       if (target.is_big_endian())
1116 #ifdef HAVE_TARGET_32_BIG
1117         obj = new Sized_pluginobj<32, true>(input_file->filename(),
1118                                             input_file, offset, filesize);
1119 #else
1120         gold_error(_("%s: not configured to support "
1121                      "32-bit big-endian object"),
1122                    input_file->filename().c_str());
1123 #endif
1124       else
1125 #ifdef HAVE_TARGET_32_LITTLE
1126         obj = new Sized_pluginobj<32, false>(input_file->filename(),
1127                                              input_file, offset, filesize);
1128 #else
1129         gold_error(_("%s: not configured to support "
1130                      "32-bit little-endian object"),
1131                    input_file->filename().c_str());
1132 #endif
1133     }
1134   else if (target.get_size() == 64)
1135     {
1136       if (target.is_big_endian())
1137 #ifdef HAVE_TARGET_64_BIG
1138         obj = new Sized_pluginobj<64, true>(input_file->filename(),
1139                                             input_file, offset, filesize);
1140 #else
1141         gold_error(_("%s: not configured to support "
1142                      "64-bit big-endian object"),
1143                    input_file->filename().c_str());
1144 #endif
1145       else
1146 #ifdef HAVE_TARGET_64_LITTLE
1147         obj = new Sized_pluginobj<64, false>(input_file->filename(),
1148                                              input_file, offset, filesize);
1149 #else
1150         gold_error(_("%s: not configured to support "
1151                      "64-bit little-endian object"),
1152                    input_file->filename().c_str());
1153 #endif
1154     }
1155
1156   gold_assert(obj != NULL);
1157   return obj;
1158 }
1159
1160 } // End namespace gold.