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(char *pathname);
  79
  80 static enum ld_plugin_status
  81 add_input_library(char *pathname);
  82
  83 static enum ld_plugin_status
  84 message(int level, const char *format, ...);
  85
  86 };
  87
  88 #endif // ENABLE_PLUGINS
  89
  90 static Pluginobj* make_sized_plugin_object(Input_file* input_file,
  91                                            off_t offset, off_t filesize);
  92
  93 // Plugin methods.
  94
  95 // Load one plugin library.
  96
  97 void
  98 Plugin::load()
  99 {
 100 #ifdef ENABLE_PLUGINS
 101   // Load the plugin library.
 102   // FIXME: Look for the library in standard locations.
 103   this->handle_ = dlopen(this->filename_.c_str(), RTLD_NOW);
 104   if (this->handle_ == NULL)
 105     {
 106       gold_error(_("%s: could not load plugin library"),
 107                  this->filename_.c_str());
 108       return;
 109     }
 110
 111   // Find the plugin's onload entry point.
 112   void* ptr = dlsym(this->handle_, "onload");
 113   if (ptr == NULL)
 114     {
 115       gold_error(_("%s: could not find onload entry point"),
 116                  this->filename_.c_str());
 117       return;
 118     }
 119   ld_plugin_onload onload;
 120   gold_assert(sizeof(onload) == sizeof(ptr));
 121   memcpy(&onload, &ptr, sizeof(ptr));
 122
 123   // Get the linker's version number.
 124   const char* ver = get_version_string();
 125   int major = 0;
 126   int minor = 0;
 127   sscanf(ver, "%d.%d", &major, &minor);
 128
 129   // Allocate and populate a transfer vector.
 130   const int tv_fixed_size = 14;
 131   int tv_size = this->args_.size() + tv_fixed_size;
 132   ld_plugin_tv *tv = new ld_plugin_tv[tv_size];
 133
 134   // Put LDPT_MESSAGE at the front of the list so the plugin can use it
 135   // while processing subsequent entries.
 136   int i = 0;
 137   tv[i].tv_tag = LDPT_MESSAGE;
 138   tv[i].tv_u.tv_message = message;
 139
 140   ++i;
 141   tv[i].tv_tag = LDPT_API_VERSION;
 142   tv[i].tv_u.tv_val = LD_PLUGIN_API_VERSION;
 143
 144   ++i;
 145   tv[i].tv_tag = LDPT_GOLD_VERSION;
 146   tv[i].tv_u.tv_val = major * 100 + minor;
 147
 148   ++i;
 149   tv[i].tv_tag = LDPT_LINKER_OUTPUT;
 150   if (parameters->options().relocatable())
 151     tv[i].tv_u.tv_val = LDPO_REL;
 152   else if (parameters->options().shared())
 153     tv[i].tv_u.tv_val = LDPO_DYN;
 154   else
 155     tv[i].tv_u.tv_val = LDPO_EXEC;
 156
 157   for (unsigned int j = 0; j < this->args_.size(); ++j)
 158     {
 159       ++i;
 160       tv[i].tv_tag = LDPT_OPTION;
 161       tv[i].tv_u.tv_string = this->args_[j].c_str();
 162     }
 163
 164   ++i;
 165   tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
 166   tv[i].tv_u.tv_register_claim_file = register_claim_file;
 167
 168   ++i;
 169   tv[i].tv_tag = LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK;
 170   tv[i].tv_u.tv_register_all_symbols_read = register_all_symbols_read;
 171
 172   ++i;
 173   tv[i].tv_tag = LDPT_REGISTER_CLEANUP_HOOK;
 174   tv[i].tv_u.tv_register_cleanup = register_cleanup;
 175
 176   ++i;
 177   tv[i].tv_tag = LDPT_ADD_SYMBOLS;
 178   tv[i].tv_u.tv_add_symbols = add_symbols;
 179
 180   ++i;
 181   tv[i].tv_tag = LDPT_GET_INPUT_FILE;
 182   tv[i].tv_u.tv_get_input_file = get_input_file;
 183
 184   ++i;
 185   tv[i].tv_tag = LDPT_RELEASE_INPUT_FILE;
 186   tv[i].tv_u.tv_release_input_file = release_input_file;
 187
 188   ++i;
 189   tv[i].tv_tag = LDPT_GET_SYMBOLS;
 190   tv[i].tv_u.tv_get_symbols = get_symbols;
 191
 192   ++i;
 193   tv[i].tv_tag = LDPT_ADD_INPUT_FILE;
 194   tv[i].tv_u.tv_add_input_file = add_input_file;
 195
 196   ++i;
 197   tv[i].tv_tag = LDPT_ADD_INPUT_LIBRARY;
 198   tv[i].tv_u.tv_add_input_library = add_input_library;
 199
 200   ++i;
 201   tv[i].tv_tag = LDPT_NULL;
 202   tv[i].tv_u.tv_val = 0;
 203
 204   gold_assert(i == tv_size - 1);
 205
 206   // Call the onload entry point.
 207   (*onload)(tv);
 208
 209   delete[] tv;
 210 #endif // ENABLE_PLUGINS
 211 }
 212
 213 // Call the plugin claim-file handler.
 214
 215 inline bool
 216 Plugin::claim_file(struct ld_plugin_input_file *plugin_input_file)
 217 {
 218   int claimed = 0;
 219
 220   if (this->claim_file_handler_ != NULL)
 221     {
 222       (*this->claim_file_handler_)(plugin_input_file, &claimed);
 223       if (claimed)
 224         return true;
 225     }
 226   return false;
 227 }
 228
 229 // Call the all-symbols-read handler.
 230
 231 inline void
 232 Plugin::all_symbols_read()
 233 {
 234   if (this->all_symbols_read_handler_ != NULL)
 235     (*this->all_symbols_read_handler_)();
 236 }
 237
 238 // Call the cleanup handler.
 239
 240 inline void
 241 Plugin::cleanup()
 242 {
 243   if (this->cleanup_handler_ != NULL && !this->cleanup_done_)
 244     {
 245       // Set this flag before calling to prevent a recursive plunge
 246       // in the event that a plugin's cleanup handler issues a
 247       // fatal error.
 248       this->cleanup_done_ = true;
 249       (*this->cleanup_handler_)();
 250     }
 251 }
 252
 253 // Plugin_manager methods.
 254
 255 Plugin_manager::~Plugin_manager()
 256 {
 257   for (Plugin_list::iterator p = this->plugins_.begin();
 258        p != this->plugins_.end();
 259        ++p)
 260     delete *p;
 261   this->plugins_.clear();
 262   for (Object_list::iterator obj = this->objects_.begin();
 263        obj != this->objects_.end();
 264        ++obj)
 265     delete *obj;
 266   this->objects_.clear();
 267 }
 268
 269 // Load all plugin libraries.
 270
 271 void
 272 Plugin_manager::load_plugins()
 273 {
 274   for (this->current_ = this->plugins_.begin();
 275        this->current_ != this->plugins_.end();
 276        ++this->current_)
 277     (*this->current_)->load();
 278 }
 279
 280 // Call the plugin claim-file handlers in turn to see if any claim the file.
 281
 282 Pluginobj*
 283 Plugin_manager::claim_file(Input_file* input_file, off_t offset,
 284                            off_t filesize)
 285 {
 286   if (this->in_replacement_phase_)
 287     return NULL;
 288
 289   unsigned int handle = this->objects_.size();
 290   this->input_file_ = input_file;
 291   this->plugin_input_file_.name = input_file->filename().c_str();
 292   this->plugin_input_file_.fd = input_file->file().descriptor();
 293   this->plugin_input_file_.offset = offset;
 294   this->plugin_input_file_.filesize = filesize;
 295   this->plugin_input_file_.handle = reinterpret_cast<void*>(handle);
 296
 297   for (this->current_ = this->plugins_.begin();
 298        this->current_ != this->plugins_.end();
 299        ++this->current_)
 300     {
 301       if ((*this->current_)->claim_file(&this->plugin_input_file_))
 302         {
 303           if (this->objects_.size() > handle)
 304             return this->objects_[handle];
 305
 306           // If the plugin claimed the file but did not call the
 307           // add_symbols callback, we need to create the Pluginobj now.
 308           Pluginobj* obj = this->make_plugin_object(handle);
 309           return obj;
 310         }
 311     }
 312
 313   return NULL;
 314 }
 315
 316 // Call the all-symbols-read handlers.
 317
 318 void
 319 Plugin_manager::all_symbols_read(Workqueue* workqueue, Task* task,
 320                                  Input_objects* input_objects,
 321                                  Symbol_table* symtab, Layout* layout,
 322                                  Dirsearch* dirpath, Mapfile* mapfile,
 323                                  Task_token** last_blocker)
 324 {
 325   this->in_replacement_phase_ = true;
 326   this->workqueue_ = workqueue;
 327   this->task_ = task;
 328   this->input_objects_ = input_objects;
 329   this->symtab_ = symtab;
 330   this->layout_ = layout;
 331   this->dirpath_ = dirpath;
 332   this->mapfile_ = mapfile;
 333   this->this_blocker_ = NULL;
 334
 335   for (this->current_ = this->plugins_.begin();
 336        this->current_ != this->plugins_.end();
 337        ++this->current_)
 338     (*this->current_)->all_symbols_read();
 339
 340   *last_blocker = this->this_blocker_;
 341 }
 342
 343 // Layout deferred objects.
 344
 345 void
 346 Plugin_manager::layout_deferred_objects()
 347 {
 348   Deferred_layout_list::iterator obj;
 349
 350   for (obj = this->deferred_layout_objects_.begin();
 351        obj != this->deferred_layout_objects_.end();
 352        ++obj)
 353     (*obj)->layout_deferred_sections(this->layout_);
 354 }
 355
 356 // Call the cleanup handlers.
 357
 358 void
 359 Plugin_manager::cleanup()
 360 {
 361   for (this->current_ = this->plugins_.begin();
 362        this->current_ != this->plugins_.end();
 363        ++this->current_)
 364     (*this->current_)->cleanup();
 365 }
 366
 367 // Make a new Pluginobj object.  This is called when the plugin calls
 368 // the add_symbols API.
 369
 370 Pluginobj*
 371 Plugin_manager::make_plugin_object(unsigned int handle)
 372 {
 373   // Make sure we aren't asked to make an object for the same handle twice.
 374   if (this->objects_.size() != handle)
 375     return NULL;
 376
 377   Pluginobj* obj = make_sized_plugin_object(this->input_file_,
 378                                             this->plugin_input_file_.offset,
 379                                             this->plugin_input_file_.filesize);
 380   this->objects_.push_back(obj);
 381   return obj;
 382 }
 383
 384 // Get the input file information with an open (possibly re-opened)
 385 // file descriptor.
 386
 387 ld_plugin_status
 388 Plugin_manager::get_input_file(unsigned int handle,
 389                                struct ld_plugin_input_file *file)
 390 {
 391   Pluginobj* obj = this->object(handle);
 392   if (obj == NULL)
 393     return LDPS_BAD_HANDLE;
 394
 395   obj->lock(this->task_);
 396   file->name = obj->filename().c_str();
 397   file->fd = obj->descriptor();
 398   file->offset = obj->offset();
 399   file->filesize = obj->filesize();
 400   file->handle = reinterpret_cast<void*>(handle);
 401   return LDPS_OK;
 402 }
 403
 404 // Release the input file.
 405
 406 ld_plugin_status
 407 Plugin_manager::release_input_file(unsigned int handle)
 408 {
 409   Pluginobj* obj = this->object(handle);
 410   if (obj == NULL)
 411     return LDPS_BAD_HANDLE;
 412
 413   obj->unlock(this->task_);
 414   return LDPS_OK;
 415 }
 416
 417 // Add a new input file.
 418
 419 ld_plugin_status
 420 Plugin_manager::add_input_file(char *pathname, bool is_lib)
 421 {
 422   Input_file_argument file(pathname,
 423                            (is_lib
 424                             ? Input_file_argument::INPUT_FILE_TYPE_LIBRARY
 425                             : Input_file_argument::INPUT_FILE_TYPE_FILE),
 426                            "", false, this->options_);
 427   Input_argument* input_argument = new Input_argument(file);
 428   Task_token* next_blocker = new Task_token(true);
 429   next_blocker->add_blocker();
 430   if (this->layout_->incremental_inputs())
 431     gold_error(_("input files added by plug-ins in --incremental mode not "
 432                  "supported yet"));
 433   this->workqueue_->queue_soon(new Read_symbols(this->input_objects_,
 434                                                 this->symtab_,
 435                                                 this->layout_,
 436                                                 this->dirpath_,
 437                                                 0,
 438                                                 this->mapfile_,
 439                                                 input_argument,
 440                                                 NULL,
 441                                                 NULL,
 442                                                 this->this_blocker_,
 443                                                 next_blocker));
 444   this->this_blocker_ = next_blocker;
 445   return LDPS_OK;
 446 }
 447
 448 // Class Pluginobj.
 449
 450 Pluginobj::Pluginobj(const std::string& name, Input_file* input_file,
 451                      off_t offset, off_t filesize)
 452   : Object(name, input_file, false, offset),
 453     nsyms_(0), syms_(NULL), symbols_(), filesize_(filesize), comdat_map_()
 454 {
 455 }
 456
 457 // Return TRUE if a defined symbol might be reachable from outside the
 458 // universe of claimed objects.
 459
 460 static inline bool
 461 is_visible_from_outside(Symbol* lsym)
 462 {
 463   if (lsym->in_real_elf())
 464     return true;
 465   if (parameters->options().relocatable())
 466     return true;
 467   if (parameters->options().export_dynamic() || parameters->options().shared())
 468     return lsym->is_externally_visible();
 469   return false;
 470 }
 471
 472 // Get symbol resolution info.
 473
 474 ld_plugin_status
 475 Pluginobj::get_symbol_resolution_info(int nsyms, ld_plugin_symbol* syms) const
 476 {
 477   if (nsyms > this->nsyms_)
 478     return LDPS_NO_SYMS;
 479
 480   if (static_cast<size_t>(nsyms) > this->symbols_.size())
 481     {
 482       // We never decided to include this object. We mark all symbols as
 483       // preempted.
 484       gold_assert (this->symbols_.size() == 0);
 485       for (int i = 0; i < nsyms; i++)
 486         syms[i].resolution = LDPR_PREEMPTED_REG;
 487       return LDPS_OK;
 488     }
 489
 490   for (int i = 0; i < nsyms; i++)
 491     {
 492       ld_plugin_symbol* isym = &syms[i];
 493       Symbol* lsym = this->symbols_[i];
 494       ld_plugin_symbol_resolution res = LDPR_UNKNOWN;
 495
 496       if (lsym->is_undefined())
 497         // The symbol remains undefined.
 498         res = LDPR_UNDEF;
 499       else if (isym->def == LDPK_UNDEF
 500                || isym->def == LDPK_WEAKUNDEF
 501                || isym->def == LDPK_COMMON)
 502         {
 503           // The original symbol was undefined or common.
 504           if (lsym->source() != Symbol::FROM_OBJECT)
 505             res = LDPR_RESOLVED_EXEC;
 506           else if (lsym->object()->pluginobj() == this)
 507             res = (is_visible_from_outside(lsym)
 508                    ? LDPR_PREVAILING_DEF
 509                    : LDPR_PREVAILING_DEF_IRONLY);
 510           else if (lsym->object()->pluginobj() != NULL)
 511             res = LDPR_RESOLVED_IR;
 512           else if (lsym->object()->is_dynamic())
 513             res = LDPR_RESOLVED_DYN;
 514           else
 515             res = LDPR_RESOLVED_EXEC;
 516         }
 517       else
 518         {
 519           // The original symbol was a definition.
 520           if (lsym->source() != Symbol::FROM_OBJECT)
 521             res = LDPR_PREEMPTED_REG;
 522           else if (lsym->object() == static_cast<const Object*>(this))
 523             res = (is_visible_from_outside(lsym)
 524                    ? LDPR_PREVAILING_DEF
 525                    : LDPR_PREVAILING_DEF_IRONLY);
 526           else
 527             res = (lsym->object()->pluginobj() != NULL
 528                    ? LDPR_PREEMPTED_IR
 529                    : LDPR_PREEMPTED_REG);
 530         }
 531       isym->resolution = res;
 532     }
 533   return LDPS_OK;
 534 }
 535
 536 // Return TRUE if the comdat group with key COMDAT_KEY from this object
 537 // should be kept.
 538
 539 bool
 540 Pluginobj::include_comdat_group(std::string comdat_key, Layout* layout)
 541 {
 542   std::pair<Comdat_map::iterator, bool> ins =
 543     this->comdat_map_.insert(std::make_pair(comdat_key, false));
 544
 545   // If this is the first time we've seen this comdat key, ask the
 546   // layout object whether it should be included.
 547   if (ins.second)
 548     ins.first->second = layout->find_or_add_kept_section(comdat_key,
 549                                                          NULL, 0, true,
 550                                                          true, NULL);
 551
 552   return ins.first->second;
 553 }
 554
 555 // Class Sized_pluginobj.
 556
 557 template<int size, bool big_endian>
 558 Sized_pluginobj<size, big_endian>::Sized_pluginobj(
 559     const std::string& name,
 560     Input_file* input_file,
 561     off_t offset,
 562     off_t filesize)
 563   : Pluginobj(name, input_file, offset, filesize)
 564 {
 565 }
 566
 567 // Read the symbols.  Not used for plugin objects.
 568
 569 template<int size, bool big_endian>
 570 void
 571 Sized_pluginobj<size, big_endian>::do_read_symbols(Read_symbols_data*)
 572 {
 573   gold_unreachable();
 574 }
 575
 576 // Lay out the input sections.  Not used for plugin objects.
 577
 578 template<int size, bool big_endian>
 579 void
 580 Sized_pluginobj<size, big_endian>::do_layout(Symbol_table*, Layout*,
 581                                              Read_symbols_data*)
 582 {
 583   gold_unreachable();
 584 }
 585
 586 // Add the symbols to the symbol table.
 587
 588 template<int size, bool big_endian>
 589 void
 590 Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
 591                                                   Read_symbols_data*,
 592                                                   Layout* layout)
 593 {
 594   const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
 595   unsigned char symbuf[sym_size];
 596   elfcpp::Sym<size, big_endian> sym(symbuf);
 597   elfcpp::Sym_write<size, big_endian> osym(symbuf);
 598
 599   typedef typename elfcpp::Elf_types<size>::Elf_WXword Elf_size_type;
 600
 601   this->symbols_.resize(this->nsyms_);
 602
 603   for (int i = 0; i < this->nsyms_; ++i)
 604     {
 605       const struct ld_plugin_symbol *isym = &this->syms_[i];
 606       const char* name = isym->name;
 607       const char* ver = isym->version;
 608       elfcpp::Elf_Half shndx;
 609       elfcpp::STB bind;
 610       elfcpp::STV vis;
 611
 612       if (name != NULL && name[0] == '\0')
 613         name = NULL;
 614       if (ver != NULL && ver[0] == '\0')
 615         ver = NULL;
 616
 617       switch (isym->def)
 618         {
 619         case LDPK_WEAKDEF:
 620         case LDPK_WEAKUNDEF:
 621           bind = elfcpp::STB_WEAK;
 622           break;
 623         case LDPK_DEF:
 624         case LDPK_UNDEF:
 625         case LDPK_COMMON:
 626         default:
 627           bind = elfcpp::STB_GLOBAL;
 628           break;
 629         }
 630
 631       switch (isym->def)
 632         {
 633         case LDPK_DEF:
 634         case LDPK_WEAKDEF:
 635           shndx = elfcpp::SHN_ABS;
 636           break;
 637         case LDPK_COMMON:
 638           shndx = elfcpp::SHN_COMMON;
 639           break;
 640         case LDPK_UNDEF:
 641         case LDPK_WEAKUNDEF:
 642         default:
 643           shndx = elfcpp::SHN_UNDEF;
 644           break;
 645         }
 646
 647       switch (isym->visibility)
 648         {
 649         case LDPV_PROTECTED:
 650           vis = elfcpp::STV_PROTECTED;
 651           break;
 652         case LDPV_INTERNAL:
 653           vis = elfcpp::STV_INTERNAL;
 654           break;
 655         case LDPV_HIDDEN:
 656           vis = elfcpp::STV_HIDDEN;
 657           break;
 658         case LDPV_DEFAULT:
 659         default:
 660           vis = elfcpp::STV_DEFAULT;
 661           break;
 662         }
 663
 664       if (isym->comdat_key != NULL
 665           && isym->comdat_key[0] != '\0'
 666           && !this->include_comdat_group(isym->comdat_key, layout))
 667         shndx = elfcpp::SHN_UNDEF;
 668
 669       osym.put_st_name(0);
 670       osym.put_st_value(0);
 671       osym.put_st_size(static_cast<Elf_size_type>(isym->size));
 672       osym.put_st_info(bind, elfcpp::STT_NOTYPE);
 673       osym.put_st_other(vis, 0);
 674       osym.put_st_shndx(shndx);
 675
 676       this->symbols_[i] =
 677         symtab->add_from_pluginobj<size, big_endian>(this, name, ver, &sym);
 678     }
 679 }
 680
 681 template<int size, bool big_endian>
 682 Archive::Should_include
 683 Sized_pluginobj<size, big_endian>::do_should_include_member(
 684     Symbol_table* symtab, Read_symbols_data*, std::string* why)
 685 {
 686   char* tmpbuf = NULL;
 687   size_t tmpbuflen = 0;
 688
 689   for (int i = 0; i < this->nsyms_; ++i) {
 690     const struct ld_plugin_symbol& sym = this->syms_[i];
 691     const char* name = sym.name;
 692     Symbol* symbol;
 693     Archive::Should_include t = Archive::should_include_member(symtab, name,
 694                                                                &symbol, why,
 695                                                                &tmpbuf,
 696                                                                &tmpbuflen);
 697       if (t == Archive::SHOULD_INCLUDE_YES)
 698         {
 699           if (tmpbuf != NULL)
 700             free(tmpbuf);
 701           return t;
 702         }
 703   }
 704   if (tmpbuf != NULL)
 705     free(tmpbuf);
 706   return Archive::SHOULD_INCLUDE_UNKNOWN;
 707 }
 708
 709 // Get the size of a section.  Not used for plugin objects.
 710
 711 template<int size, bool big_endian>
 712 uint64_t
 713 Sized_pluginobj<size, big_endian>::do_section_size(unsigned int)
 714 {
 715   gold_unreachable();
 716   return 0;
 717 }
 718
 719 // Get the name of a section.  Not used for plugin objects.
 720
 721 template<int size, bool big_endian>
 722 std::string
 723 Sized_pluginobj<size, big_endian>::do_section_name(unsigned int)
 724 {
 725   gold_unreachable();
 726   return std::string();
 727 }
 728
 729 // Return a view of the contents of a section.  Not used for plugin objects.
 730
 731 template<int size, bool big_endian>
 732 Object::Location
 733 Sized_pluginobj<size, big_endian>::do_section_contents(unsigned int)
 734 {
 735   Location loc(0, 0);
 736
 737   gold_unreachable();
 738   return loc;
 739 }
 740
 741 // Return section flags.  Not used for plugin objects.
 742
 743 template<int size, bool big_endian>
 744 uint64_t
 745 Sized_pluginobj<size, big_endian>::do_section_flags(unsigned int)
 746 {
 747   gold_unreachable();
 748   return 0;
 749 }
 750
 751 // Return section entsize.  Not used for plugin objects.
 752
 753 template<int size, bool big_endian>
 754 uint64_t
 755 Sized_pluginobj<size, big_endian>::do_section_entsize(unsigned int)
 756 {
 757   gold_unreachable();
 758   return 0;
 759 }
 760
 761 // Return section address.  Not used for plugin objects.
 762
 763 template<int size, bool big_endian>
 764 uint64_t
 765 Sized_pluginobj<size, big_endian>::do_section_address(unsigned int)
 766 {
 767   gold_unreachable();
 768   return 0;
 769 }
 770
 771 // Return section type.  Not used for plugin objects.
 772
 773 template<int size, bool big_endian>
 774 unsigned int
 775 Sized_pluginobj<size, big_endian>::do_section_type(unsigned int)
 776 {
 777   gold_unreachable();
 778   return 0;
 779 }
 780
 781 // Return the section link field.  Not used for plugin objects.
 782
 783 template<int size, bool big_endian>
 784 unsigned int
 785 Sized_pluginobj<size, big_endian>::do_section_link(unsigned int)
 786 {
 787   gold_unreachable();
 788   return 0;
 789 }
 790
 791 // Return the section link field.  Not used for plugin objects.
 792
 793 template<int size, bool big_endian>
 794 unsigned int
 795 Sized_pluginobj<size, big_endian>::do_section_info(unsigned int)
 796 {
 797   gold_unreachable();
 798   return 0;
 799 }
 800
 801 // Return the section alignment.  Not used for plugin objects.
 802
 803 template<int size, bool big_endian>
 804 uint64_t
 805 Sized_pluginobj<size, big_endian>::do_section_addralign(unsigned int)
 806 {
 807   gold_unreachable();
 808   return 0;
 809 }
 810
 811 // Return the Xindex structure to use.  Not used for plugin objects.
 812
 813 template<int size, bool big_endian>
 814 Xindex*
 815 Sized_pluginobj<size, big_endian>::do_initialize_xindex()
 816 {
 817   gold_unreachable();
 818   return NULL;
 819 }
 820
 821 // Get symbol counts.  Not used for plugin objects.
 822
 823 template<int size, bool big_endian>
 824 void
 825 Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(const Symbol_table*,
 826                                                    size_t*, size_t*) const
 827 {
 828   gold_unreachable();
 829 }
 830
 831 // Get symbols.  Not used for plugin objects.
 832
 833 template<int size, bool big_endian>
 834 const Object::Symbols*
 835 Sized_pluginobj<size, big_endian>::do_get_global_symbols() const
 836 {
 837   gold_unreachable();
 838 }
 839
 840 // Class Plugin_finish.  This task runs after all replacement files have
 841 // been added.  It calls each plugin's cleanup handler.
 842
 843 class Plugin_finish : public Task
 844 {
 845  public:
 846   Plugin_finish(Task_token* this_blocker, Task_token* next_blocker)
 847     : this_blocker_(this_blocker), next_blocker_(next_blocker)
 848   { }
 849
 850   ~Plugin_finish()
 851   {
 852     if (this->this_blocker_ != NULL)
 853       delete this->this_blocker_;
 854   }
 855
 856   Task_token*
 857   is_runnable()
 858   {
 859     if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 860       return this->this_blocker_;
 861     return NULL;
 862   }
 863
 864   void
 865   locks(Task_locker* tl)
 866   { tl->add(this, this->next_blocker_); }
 867
 868   void
 869   run(Workqueue*)
 870   {
 871     Plugin_manager* plugins = parameters->options().plugins();
 872     gold_assert(plugins != NULL);
 873     plugins->cleanup();
 874   }
 875
 876   std::string
 877   get_name() const
 878   { return "Plugin_finish"; }
 879
 880  private:
 881   Task_token* this_blocker_;
 882   Task_token* next_blocker_;
 883 };
 884
 885 // Class Plugin_hook.
 886
 887 Plugin_hook::~Plugin_hook()
 888 {
 889 }
 890
 891 // Return whether a Plugin_hook task is runnable.
 892
 893 Task_token*
 894 Plugin_hook::is_runnable()
 895 {
 896   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 897     return this->this_blocker_;
 898   return NULL;
 899 }
 900
 901 // Return a Task_locker for a Plugin_hook task.  We don't need any
 902 // locks here.
 903
 904 void
 905 Plugin_hook::locks(Task_locker*)
 906 {
 907 }
 908
 909 // Run the "all symbols read" plugin hook.
 910
 911 void
 912 Plugin_hook::run(Workqueue* workqueue)
 913 {
 914   gold_assert(this->options_.has_plugins());
 915   this->options_.plugins()->all_symbols_read(workqueue,
 916                                              this,
 917                                              this->input_objects_,
 918                                              this->symtab_,
 919                                              this->layout_,
 920                                              this->dirpath_,
 921                                              this->mapfile_,
 922                                              &this->this_blocker_);
 923   workqueue->queue_soon(new Plugin_finish(this->this_blocker_,
 924                                           this->next_blocker_));
 925 }
 926
 927 // The C interface routines called by the plugins.
 928
 929 #ifdef ENABLE_PLUGINS
 930
 931 // Register a claim-file handler.
 932
 933 static enum ld_plugin_status
 934 register_claim_file(ld_plugin_claim_file_handler handler)
 935 {
 936   gold_assert(parameters->options().has_plugins());
 937   parameters->options().plugins()->set_claim_file_handler(handler);
 938   return LDPS_OK;
 939 }
 940
 941 // Register an all-symbols-read handler.
 942
 943 static enum ld_plugin_status
 944 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler)
 945 {
 946   gold_assert(parameters->options().has_plugins());
 947   parameters->options().plugins()->set_all_symbols_read_handler(handler);
 948   return LDPS_OK;
 949 }
 950
 951 // Register a cleanup handler.
 952
 953 static enum ld_plugin_status
 954 register_cleanup(ld_plugin_cleanup_handler handler)
 955 {
 956   gold_assert(parameters->options().has_plugins());
 957   parameters->options().plugins()->set_cleanup_handler(handler);
 958   return LDPS_OK;
 959 }
 960
 961 // Add symbols from a plugin-claimed input file.
 962
 963 static enum ld_plugin_status
 964 add_symbols(void* handle, int nsyms, const ld_plugin_symbol *syms)
 965 {
 966   gold_assert(parameters->options().has_plugins());
 967   Pluginobj* obj = parameters->options().plugins()->make_plugin_object(
 968       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
 969   if (obj == NULL)
 970     return LDPS_ERR;
 971   obj->store_incoming_symbols(nsyms, syms);
 972   return LDPS_OK;
 973 }
 974
 975 // Get the input file information with an open (possibly re-opened)
 976 // file descriptor.
 977
 978 static enum ld_plugin_status
 979 get_input_file(const void *handle, struct ld_plugin_input_file *file)
 980 {
 981   gold_assert(parameters->options().has_plugins());
 982   unsigned int obj_index =
 983       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
 984   return parameters->options().plugins()->get_input_file(obj_index, file);
 985 }
 986
 987 // Release the input file.
 988
 989 static enum ld_plugin_status
 990 release_input_file(const void *handle)
 991 {
 992   gold_assert(parameters->options().has_plugins());
 993   unsigned int obj_index =
 994       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
 995   return parameters->options().plugins()->release_input_file(obj_index);
 996 }
 997
 998 // Get the symbol resolution info for a plugin-claimed input file.
 999
1000 static enum ld_plugin_status
1001 get_symbols(const void * handle, int nsyms, ld_plugin_symbol* syms)
1002 {
1003   gold_assert(parameters->options().has_plugins());
1004   Pluginobj* obj = parameters->options().plugins()->object(
1005       static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
1006   if (obj == NULL)
1007     return LDPS_ERR;
1008   return obj->get_symbol_resolution_info(nsyms, syms);
1009 }
1010
1011 // Add a new (real) input file generated by a plugin.
1012
1013 static enum ld_plugin_status
1014 add_input_file(char *pathname)
1015 {
1016   gold_assert(parameters->options().has_plugins());
1017   return parameters->options().plugins()->add_input_file(pathname, false);
1018 }
1019
1020 // Add a new (real) library required by a plugin.
1021
1022 static enum ld_plugin_status
1023 add_input_library(char *pathname)
1024 {
1025   gold_assert(parameters->options().has_plugins());
1026   return parameters->options().plugins()->add_input_file(pathname, true);
1027 }
1028
1029 // Issue a diagnostic message from a plugin.
1030
1031 static enum ld_plugin_status
1032 message(int level, const char * format, ...)
1033 {
1034   va_list args;
1035   va_start(args, format);
1036
1037   switch (level)
1038     {
1039     case LDPL_INFO:
1040       parameters->errors()->info(format, args);
1041       break;
1042     case LDPL_WARNING:
1043       parameters->errors()->warning(format, args);
1044       break;
1045     case LDPL_ERROR:
1046     default:
1047       parameters->errors()->error(format, args);
1048       break;
1049     case LDPL_FATAL:
1050       parameters->errors()->fatal(format, args);
1051       break;
1052     }
1053
1054   va_end(args);
1055   return LDPS_OK;
1056 }
1057
1058 #endif // ENABLE_PLUGINS
1059
1060 // Allocate a Pluginobj object of the appropriate size and endianness.
1061
1062 static Pluginobj*
1063 make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize)
1064 {
1065   Pluginobj* obj = NULL;
1066
1067   parameters_force_valid_target();
1068   const Target& target(parameters->target());
1069
1070   if (target.get_size() == 32)
1071     {
1072       if (target.is_big_endian())
1073 #ifdef HAVE_TARGET_32_BIG
1074         obj = new Sized_pluginobj<32, true>(input_file->filename(),
1075                                             input_file, offset, filesize);
1076 #else
1077         gold_error(_("%s: not configured to support "
1078                      "32-bit big-endian object"),
1079                    input_file->filename().c_str());
1080 #endif
1081       else
1082 #ifdef HAVE_TARGET_32_LITTLE
1083         obj = new Sized_pluginobj<32, false>(input_file->filename(),
1084                                              input_file, offset, filesize);
1085 #else
1086         gold_error(_("%s: not configured to support "
1087                      "32-bit little-endian object"),
1088                    input_file->filename().c_str());
1089 #endif
1090     }
1091   else if (target.get_size() == 64)
1092     {
1093       if (target.is_big_endian())
1094 #ifdef HAVE_TARGET_64_BIG
1095         obj = new Sized_pluginobj<64, true>(input_file->filename(),
1096                                             input_file, offset, filesize);
1097 #else
1098         gold_error(_("%s: not configured to support "
1099                      "64-bit big-endian object"),
1100                    input_file->filename().c_str());
1101 #endif
1102       else
1103 #ifdef HAVE_TARGET_64_LITTLE
1104         obj = new Sized_pluginobj<64, false>(input_file->filename(),
1105                                              input_file, offset, filesize);
1106 #else
1107         gold_error(_("%s: not configured to support "
1108                      "64-bit little-endian object"),
1109                    input_file->filename().c_str());
1110 #endif
1111     }
1112
1113   gold_assert(obj != NULL);
1114   return obj;
1115 }
1116
1117 } // End namespace gold.