gold/archive.cc

   1 // archive.cc -- archive support for gold
   2
   3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@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 <cerrno>
  26 #include <cstring>
  27 #include <climits>
  28 #include <vector>
  29 #include "libiberty.h"
  30 #include "filenames.h"
  31
  32 #include "elfcpp.h"
  33 #include "options.h"
  34 #include "mapfile.h"
  35 #include "fileread.h"
  36 #include "readsyms.h"
  37 #include "symtab.h"
  38 #include "object.h"
  39 #include "archive.h"
  40
  41 namespace gold
  42 {
  43
  44 // The header of an entry in the archive.  This is all readable text,
  45 // padded with spaces where necesary.  If the contents of an archive
  46 // are all text file, the entire archive is readable.
  47
  48 struct Archive::Archive_header
  49 {
  50   // The entry name.
  51   char ar_name[16];
  52   // The file modification time.
  53   char ar_date[12];
  54   // The user's UID in decimal.
  55   char ar_uid[6];
  56   // The user's GID in decimal.
  57   char ar_gid[6];
  58   // The file mode in octal.
  59   char ar_mode[8];
  60   // The file size in decimal.
  61   char ar_size[10];
  62   // The final magic code.
  63   char ar_fmag[2];
  64 };
  65
  66 // Class Archive static variables.
  67 unsigned int Archive::total_archives;
  68 unsigned int Archive::total_members;
  69 unsigned int Archive::total_members_loaded;
  70
  71 // Archive methods.
  72
  73 const char Archive::armag[sarmag] =
  74 {
  75   '!', '<', 'a', 'r', 'c', 'h', '>', '\n'
  76 };
  77
  78 const char Archive::armagt[sarmag] =
  79 {
  80   '!', '<', 't', 'h', 'i', 'n', '>', '\n'
  81 };
  82
  83 const char Archive::arfmag[2] = { '`', '\n' };
  84
  85 // Set up the archive: read the symbol map and the extended name
  86 // table.
  87
  88 void
  89 Archive::setup(Input_objects* input_objects)
  90 {
  91   // We need to ignore empty archives.
  92   if (this->input_file_->file().filesize() == sarmag)
  93     return;
  94
  95   // The first member of the archive should be the symbol table.
  96   std::string armap_name;
  97   section_size_type armap_size =
  98     convert_to_section_size_type(this->read_header(sarmag, false,
  99                                                    &armap_name, NULL));
 100   off_t off = sarmag;
 101   if (armap_name.empty())
 102     {
 103       this->read_armap(sarmag + sizeof(Archive_header), armap_size);
 104       off = sarmag + sizeof(Archive_header) + armap_size;
 105     }
 106   else if (!this->input_file_->options().whole_archive())
 107     gold_error(_("%s: no archive symbol table (run ranlib)"),
 108                this->name().c_str());
 109
 110   // See if there is an extended name table.  We cache these views
 111   // because it is likely that we will want to read the following
 112   // header in the add_symbols routine.
 113   if ((off & 1) != 0)
 114     ++off;
 115   std::string xname;
 116   section_size_type extended_size =
 117     convert_to_section_size_type(this->read_header(off, true, &xname, NULL));
 118   if (xname == "/")
 119     {
 120       const unsigned char* p = this->get_view(off + sizeof(Archive_header),
 121                                               extended_size, false, true);
 122       const char* px = reinterpret_cast<const char*>(p);
 123       this->extended_names_.assign(px, extended_size);
 124     }
 125   bool preread_syms = (parameters->options().threads()
 126                        && parameters->options().preread_archive_symbols());
 127 #ifndef ENABLE_THREADS
 128   preread_syms = false;
 129 #endif
 130   if (preread_syms)
 131     this->read_all_symbols(input_objects);
 132 }
 133
 134 // Unlock any nested archives.
 135
 136 void
 137 Archive::unlock_nested_archives()
 138 {
 139   for (Nested_archive_table::iterator p = this->nested_archives_.begin();
 140        p != this->nested_archives_.end();
 141        ++p)
 142     {
 143       p->second->unlock(this->task_);
 144     }
 145 }
 146
 147 // Read the archive symbol map.
 148
 149 void
 150 Archive::read_armap(off_t start, section_size_type size)
 151 {
 152   // To count the total number of archive members, we'll just count
 153   // the number of times the file offset changes.  Since most archives
 154   // group the symbols in the armap by object, this ought to give us
 155   // an accurate count.
 156   off_t last_seen_offset = -1;
 157
 158   // Read in the entire armap.
 159   const unsigned char* p = this->get_view(start, size, true, false);
 160
 161   // Numbers in the armap are always big-endian.
 162   const elfcpp::Elf_Word* pword = reinterpret_cast<const elfcpp::Elf_Word*>(p);
 163   unsigned int nsyms = elfcpp::Swap<32, true>::readval(pword);
 164   ++pword;
 165
 166   // Note that the addition is in units of sizeof(elfcpp::Elf_Word).
 167   const char* pnames = reinterpret_cast<const char*>(pword + nsyms);
 168   section_size_type names_size =
 169     reinterpret_cast<const char*>(p) + size - pnames;
 170   this->armap_names_.assign(pnames, names_size);
 171
 172   this->armap_.resize(nsyms);
 173
 174   section_offset_type name_offset = 0;
 175   for (unsigned int i = 0; i < nsyms; ++i)
 176     {
 177       this->armap_[i].name_offset = name_offset;
 178       this->armap_[i].file_offset = elfcpp::Swap<32, true>::readval(pword);
 179       name_offset += strlen(pnames + name_offset) + 1;
 180       ++pword;
 181       if (this->armap_[i].file_offset != last_seen_offset)
 182         {
 183           last_seen_offset = this->armap_[i].file_offset;
 184           ++this->num_members_;
 185         }
 186     }
 187
 188   if (static_cast<section_size_type>(name_offset) > names_size)
 189     gold_error(_("%s: bad archive symbol table names"),
 190                this->name().c_str());
 191
 192   // This array keeps track of which symbols are for archive elements
 193   // which we have already included in the link.
 194   this->armap_checked_.resize(nsyms);
 195 }
 196
 197 // Read the header of an archive member at OFF.  Fail if something
 198 // goes wrong.  Return the size of the member.  Set *PNAME to the name
 199 // of the member.
 200
 201 off_t
 202 Archive::read_header(off_t off, bool cache, std::string* pname,
 203                      off_t* nested_off)
 204 {
 205   const unsigned char* p = this->get_view(off, sizeof(Archive_header), true,
 206                                           cache);
 207   const Archive_header* hdr = reinterpret_cast<const Archive_header*>(p);
 208   return this->interpret_header(hdr, off,  pname, nested_off);
 209 }
 210
 211 // Interpret the header of HDR, the header of the archive member at
 212 // file offset OFF.  Fail if something goes wrong.  Return the size of
 213 // the member.  Set *PNAME to the name of the member.
 214
 215 off_t
 216 Archive::interpret_header(const Archive_header* hdr, off_t off,
 217                           std::string* pname, off_t* nested_off) const
 218 {
 219   if (memcmp(hdr->ar_fmag, arfmag, sizeof arfmag) != 0)
 220     {
 221       gold_error(_("%s: malformed archive header at %zu"),
 222                  this->name().c_str(), static_cast<size_t>(off));
 223       return this->input_file_->file().filesize() - off;
 224     }
 225
 226   const int size_string_size = sizeof hdr->ar_size;
 227   char size_string[size_string_size + 1];
 228   memcpy(size_string, hdr->ar_size, size_string_size);
 229   char* ps = size_string + size_string_size;
 230   while (ps[-1] == ' ')
 231     --ps;
 232   *ps = '\0';
 233
 234   errno = 0;
 235   char* end;
 236   off_t member_size = strtol(size_string, &end, 10);
 237   if (*end != '\0'
 238       || member_size < 0
 239       || (member_size == LONG_MAX && errno == ERANGE))
 240     {
 241       gold_error(_("%s: malformed archive header size at %zu"),
 242                  this->name().c_str(), static_cast<size_t>(off));
 243       return this->input_file_->file().filesize() - off;
 244     }
 245
 246   if (hdr->ar_name[0] != '/')
 247     {
 248       const char* name_end = strchr(hdr->ar_name, '/');
 249       if (name_end == NULL
 250           || name_end - hdr->ar_name >= static_cast<int>(sizeof hdr->ar_name))
 251         {
 252           gold_error(_("%s: malformed archive header name at %zu"),
 253                      this->name().c_str(), static_cast<size_t>(off));
 254           return this->input_file_->file().filesize() - off;
 255         }
 256       pname->assign(hdr->ar_name, name_end - hdr->ar_name);
 257       if (nested_off != NULL)
 258         *nested_off = 0;
 259     }
 260   else if (hdr->ar_name[1] == ' ')
 261     {
 262       // This is the symbol table.
 263       pname->clear();
 264     }
 265   else if (hdr->ar_name[1] == '/')
 266     {
 267       // This is the extended name table.
 268       pname->assign(1, '/');
 269     }
 270   else
 271     {
 272       errno = 0;
 273       long x = strtol(hdr->ar_name + 1, &end, 10);
 274       long y = 0;
 275       if (*end == ':')
 276         y = strtol(end + 1, &end, 10);
 277       if (*end != ' '
 278           || x < 0
 279           || (x == LONG_MAX && errno == ERANGE)
 280           || static_cast<size_t>(x) >= this->extended_names_.size())
 281         {
 282           gold_error(_("%s: bad extended name index at %zu"),
 283                      this->name().c_str(), static_cast<size_t>(off));
 284           return this->input_file_->file().filesize() - off;
 285         }
 286
 287       const char* name = this->extended_names_.data() + x;
 288       const char* name_end = strchr(name, '\n');
 289       if (static_cast<size_t>(name_end - name) > this->extended_names_.size()
 290           || name_end[-1] != '/')
 291         {
 292           gold_error(_("%s: bad extended name entry at header %zu"),
 293                      this->name().c_str(), static_cast<size_t>(off));
 294           return this->input_file_->file().filesize() - off;
 295         }
 296       pname->assign(name, name_end - 1 - name);
 297       if (nested_off != NULL)
 298         *nested_off = y;
 299     }
 300
 301   return member_size;
 302 }
 303
 304 // An archive member iterator.
 305
 306 class Archive::const_iterator
 307 {
 308  public:
 309   // The header of an archive member.  This is what this iterator
 310   // points to.
 311   struct Header
 312   {
 313     // The name of the member.
 314     std::string name;
 315     // The file offset of the member.
 316     off_t off;
 317     // The file offset of a nested archive member.
 318     off_t nested_off;
 319     // The size of the member.
 320     off_t size;
 321   };
 322
 323   const_iterator(Archive* archive, off_t off)
 324     : archive_(archive), off_(off)
 325   { this->read_next_header(); }
 326
 327   const Header&
 328   operator*() const
 329   { return this->header_; }
 330
 331   const Header*
 332   operator->() const
 333   { return &this->header_; }
 334
 335   const_iterator&
 336   operator++()
 337   {
 338     if (this->off_ == this->archive_->file().filesize())
 339       return *this;
 340     this->off_ += sizeof(Archive_header);
 341     if (!this->archive_->is_thin_archive())
 342       this->off_ += this->header_.size;
 343     if ((this->off_ & 1) != 0)
 344       ++this->off_;
 345     this->read_next_header();
 346     return *this;
 347   }
 348
 349   const_iterator
 350   operator++(int)
 351   {
 352     const_iterator ret = *this;
 353     ++*this;
 354     return ret;
 355   }
 356
 357   bool
 358   operator==(const const_iterator p) const
 359   { return this->off_ == p->off; }
 360
 361   bool
 362   operator!=(const const_iterator p) const
 363   { return this->off_ != p->off; }
 364
 365  private:
 366   void
 367   read_next_header();
 368
 369   // The underlying archive.
 370   Archive* archive_;
 371   // The current offset in the file.
 372   off_t off_;
 373   // The current archive header.
 374   Header header_;
 375 };
 376
 377 // Read the next archive header.
 378
 379 void
 380 Archive::const_iterator::read_next_header()
 381 {
 382   off_t filesize = this->archive_->file().filesize();
 383   while (true)
 384     {
 385       if (filesize - this->off_ < static_cast<off_t>(sizeof(Archive_header)))
 386         {
 387           if (filesize != this->off_)
 388             {
 389               gold_error(_("%s: short archive header at %zu"),
 390                          this->archive_->filename().c_str(),
 391                          static_cast<size_t>(this->off_));
 392               this->off_ = filesize;
 393             }
 394           this->header_.off = filesize;
 395           return;
 396         }
 397
 398       unsigned char buf[sizeof(Archive_header)];
 399       this->archive_->file().read(this->off_, sizeof(Archive_header), buf);
 400
 401       const Archive_header* hdr = reinterpret_cast<const Archive_header*>(buf);
 402       this->header_.size =
 403         this->archive_->interpret_header(hdr, this->off_, &this->header_.name,
 404                                          &this->header_.nested_off);
 405       this->header_.off = this->off_;
 406
 407       // Skip special members.
 408       if (!this->header_.name.empty() && this->header_.name != "/")
 409         return;
 410
 411       this->off_ += sizeof(Archive_header) + this->header_.size;
 412       if ((this->off_ & 1) != 0)
 413         ++this->off_;
 414     }
 415 }
 416
 417 // Initial iterator.
 418
 419 Archive::const_iterator
 420 Archive::begin()
 421 {
 422   return Archive::const_iterator(this, sarmag);
 423 }
 424
 425 // Final iterator.
 426
 427 Archive::const_iterator
 428 Archive::end()
 429 {
 430   return Archive::const_iterator(this, this->input_file_->file().filesize());
 431 }
 432
 433 // Get the file and offset for an archive member, which may be an
 434 // external member of a thin archive.  Set *INPUT_FILE to the
 435 // file containing the actual member, *MEMOFF to the offset
 436 // within that file (0 if not a nested archive), and *MEMBER_NAME
 437 // to the name of the archive member.  Return TRUE on success.
 438
 439 bool
 440 Archive::get_file_and_offset(off_t off, Input_objects* input_objects,
 441                              Input_file** input_file, off_t* memoff,
 442                              std::string* member_name)
 443 {
 444   off_t nested_off;
 445
 446   this->read_header(off, false, member_name, &nested_off);
 447
 448   *input_file = this->input_file_;
 449   *memoff = off + static_cast<off_t>(sizeof(Archive_header));
 450
 451   if (!this->is_thin_archive_)
 452     return true;
 453
 454   // Adjust a relative pathname so that it is relative
 455   // to the directory containing the archive.
 456   if (!IS_ABSOLUTE_PATH(member_name->c_str()))
 457     {
 458       const char* arch_path = this->name().c_str();
 459       const char* basename = lbasename(arch_path);
 460       if (basename > arch_path)
 461         member_name->replace(0, 0,
 462                              this->name().substr(0, basename - arch_path));
 463     }
 464
 465   if (nested_off > 0)
 466     {
 467       // This is a member of a nested archive.  Open the containing
 468       // archive if we don't already have it open, then do a recursive
 469       // call to include the member from that archive.
 470       Archive* arch;
 471       Nested_archive_table::const_iterator p =
 472         this->nested_archives_.find(*member_name);
 473       if (p != this->nested_archives_.end())
 474         arch = p->second;
 475       else
 476         {
 477           Input_file_argument* input_file_arg =
 478             new Input_file_argument(member_name->c_str(), false, "", false,
 479                                     parameters->options());
 480           *input_file = new Input_file(input_file_arg);
 481           if (!(*input_file)->open(parameters->options(), *this->dirpath_,
 482                                    this->task_))
 483             return false;
 484           arch = new Archive(*member_name, *input_file, false, this->dirpath_,
 485                              this->task_);
 486           arch->setup(input_objects);
 487           std::pair<Nested_archive_table::iterator, bool> ins =
 488             this->nested_archives_.insert(std::make_pair(*member_name, arch));
 489           gold_assert(ins.second);
 490         }
 491       return arch->get_file_and_offset(nested_off, input_objects,
 492                                        input_file, memoff, member_name);
 493     }
 494
 495   // This is an external member of a thin archive.  Open the
 496   // file as a regular relocatable object file.
 497   Input_file_argument* input_file_arg =
 498       new Input_file_argument(member_name->c_str(), false, "", false,
 499                               this->input_file_->options());
 500   *input_file = new Input_file(input_file_arg);
 501   if (!(*input_file)->open(parameters->options(), *this->dirpath_,
 502                            this->task_))
 503     return false;
 504
 505   *memoff = 0;
 506   return true;
 507 }
 508
 509 // Return an ELF object for the member at offset OFF.  Set *MEMBER_NAME to
 510 // the name of the member.
 511
 512 Object*
 513 Archive::get_elf_object_for_member(off_t off, Input_objects* input_objects)
 514 {
 515   std::string member_name;
 516   Input_file* input_file;
 517   off_t memoff;
 518
 519   if (!this->get_file_and_offset(off, input_objects, &input_file, &memoff,
 520                                  &member_name))
 521     return NULL;
 522
 523   off_t filesize = input_file->file().filesize();
 524   int read_size = elfcpp::Elf_sizes<64>::ehdr_size;
 525   if (filesize - memoff < read_size)
 526     read_size = filesize - memoff;
 527
 528   if (read_size < 4)
 529     {
 530       gold_error(_("%s: member at %zu is not an ELF object"),
 531                  this->name().c_str(), static_cast<size_t>(off));
 532       return NULL;
 533     }
 534
 535   const unsigned char* ehdr = input_file->file().get_view(memoff, 0, read_size,
 536                                                           true, false);
 537
 538   static unsigned char elfmagic[4] =
 539     {
 540       elfcpp::ELFMAG0, elfcpp::ELFMAG1,
 541       elfcpp::ELFMAG2, elfcpp::ELFMAG3
 542     };
 543   if (memcmp(ehdr, elfmagic, 4) != 0)
 544     {
 545       gold_error(_("%s: member at %zu is not an ELF object"),
 546                  this->name().c_str(), static_cast<size_t>(off));
 547       return NULL;
 548     }
 549
 550   return make_elf_object((std::string(this->input_file_->filename())
 551                                  + "(" + member_name + ")"),
 552                                 input_file, memoff, ehdr, read_size);
 553 }
 554
 555 // Read the symbols from all the archive members in the link.
 556
 557 void
 558 Archive::read_all_symbols(Input_objects* input_objects)
 559 {
 560   for (Archive::const_iterator p = this->begin();
 561        p != this->end();
 562        ++p)
 563     this->read_symbols(input_objects, p->off);
 564 }
 565
 566 // Read the symbols from an archive member in the link.  OFF is the file
 567 // offset of the member header.
 568
 569 void
 570 Archive::read_symbols(Input_objects* input_objects, off_t off)
 571 {
 572   Object* obj = this->get_elf_object_for_member(off, input_objects);
 573
 574   if (obj == NULL)
 575     return;
 576
 577   Read_symbols_data* sd = new Read_symbols_data;
 578   obj->read_symbols(sd);
 579   Archive_member member(obj, sd);
 580   this->members_[off] = member;
 581 }
 582
 583 // Select members from the archive and add them to the link.  We walk
 584 // through the elements in the archive map, and look each one up in
 585 // the symbol table.  If it exists as a strong undefined symbol, we
 586 // pull in the corresponding element.  We have to do this in a loop,
 587 // since pulling in one element may create new undefined symbols which
 588 // may be satisfied by other objects in the archive.
 589
 590 void
 591 Archive::add_symbols(Symbol_table* symtab, Layout* layout,
 592                      Input_objects* input_objects, Mapfile* mapfile)
 593 {
 594   ++Archive::total_archives;
 595
 596   if (this->input_file_->options().whole_archive())
 597     return this->include_all_members(symtab, layout, input_objects,
 598                                      mapfile);
 599
 600   Archive::total_members += this->num_members_;
 601
 602   input_objects->archive_start(this);
 603
 604   const size_t armap_size = this->armap_.size();
 605
 606   // This is a quick optimization, since we usually see many symbols
 607   // in a row with the same offset.  last_seen_offset holds the last
 608   // offset we saw that was present in the seen_offsets_ set.
 609   off_t last_seen_offset = -1;
 610
 611   // Track which symbols in the symbol table we've already found to be
 612   // defined.
 613
 614   bool added_new_object;
 615   do
 616     {
 617       added_new_object = false;
 618       for (size_t i = 0; i < armap_size; ++i)
 619         {
 620           if (this->armap_checked_[i])
 621             continue;
 622           if (this->armap_[i].file_offset == last_seen_offset)
 623             {
 624               this->armap_checked_[i] = true;
 625               continue;
 626             }
 627           if (this->seen_offsets_.find(this->armap_[i].file_offset)
 628               != this->seen_offsets_.end())
 629             {
 630               this->armap_checked_[i] = true;
 631               last_seen_offset = this->armap_[i].file_offset;
 632               continue;
 633             }
 634
 635           const char* sym_name = (this->armap_names_.data()
 636                                   + this->armap_[i].name_offset);
 637           Symbol* sym = symtab->lookup(sym_name);
 638           if (sym == NULL)
 639             {
 640               // Check whether the symbol was named in a -u option.
 641               if (!parameters->options().is_undefined(sym_name))
 642                 continue;
 643             }
 644           else if (!sym->is_undefined())
 645             {
 646               this->armap_checked_[i] = true;
 647               continue;
 648             }
 649           else if (sym->binding() == elfcpp::STB_WEAK)
 650             continue;
 651
 652           // We want to include this object in the link.
 653           last_seen_offset = this->armap_[i].file_offset;
 654           this->seen_offsets_.insert(last_seen_offset);
 655           this->armap_checked_[i] = true;
 656
 657           std::string why;
 658           if (sym == NULL)
 659             {
 660               why = "-u ";
 661               why += sym_name;
 662             }
 663           this->include_member(symtab, layout, input_objects,
 664                                last_seen_offset, mapfile, sym, why.c_str());
 665
 666           added_new_object = true;
 667         }
 668     }
 669   while (added_new_object);
 670
 671   input_objects->archive_stop(this);
 672 }
 673
 674 // Include all the archive members in the link.  This is for --whole-archive.
 675
 676 void
 677 Archive::include_all_members(Symbol_table* symtab, Layout* layout,
 678                              Input_objects* input_objects, Mapfile* mapfile)
 679 {
 680   input_objects->archive_start(this);
 681
 682   if (this->members_.size() > 0)
 683     {
 684       std::map<off_t, Archive_member>::const_iterator p;
 685       for (p = this->members_.begin();
 686            p != this->members_.end();
 687            ++p)
 688         {
 689           this->include_member(symtab, layout, input_objects, p->first,
 690                                mapfile, NULL, "--whole-archive");
 691           ++Archive::total_members;
 692         }
 693     }
 694   else
 695     {
 696       for (Archive::const_iterator p = this->begin();
 697            p != this->end();
 698            ++p)
 699         {
 700           this->include_member(symtab, layout, input_objects, p->off,
 701                                mapfile, NULL, "--whole-archive");
 702           ++Archive::total_members;
 703         }
 704     }
 705
 706   input_objects->archive_stop(this);
 707 }
 708
 709 // Return the number of members in the archive.  This is only used for
 710 // reports.
 711
 712 size_t
 713 Archive::count_members()
 714 {
 715   size_t ret = 0;
 716   for (Archive::const_iterator p = this->begin();
 717        p != this->end();
 718        ++p)
 719     ++ret;
 720   return ret;
 721 }
 722
 723 // Include an archive member in the link.  OFF is the file offset of
 724 // the member header.  WHY is the reason we are including this member.
 725
 726 void
 727 Archive::include_member(Symbol_table* symtab, Layout* layout,
 728                         Input_objects* input_objects, off_t off,
 729                         Mapfile* mapfile, Symbol* sym, const char* why)
 730 {
 731   ++Archive::total_members_loaded;
 732
 733   std::map<off_t, Archive_member>::const_iterator p = this->members_.find(off);
 734   if (p != this->members_.end())
 735     {
 736       Object *obj = p->second.obj_;
 737       Read_symbols_data *sd = p->second.sd_;
 738       if (mapfile != NULL)
 739         mapfile->report_include_archive_member(obj->name(), sym, why);
 740       if (input_objects->add_object(obj))
 741         {
 742           obj->layout(symtab, layout, sd);
 743           obj->add_symbols(symtab, sd);
 744         }
 745       delete sd;
 746       return;
 747     }
 748
 749   Object* obj = this->get_elf_object_for_member(off, input_objects);
 750   if (obj == NULL)
 751     return;
 752
 753   if (mapfile != NULL)
 754     mapfile->report_include_archive_member(obj->name(), sym, why);
 755
 756   if (input_objects->add_object(obj))
 757     {
 758       Read_symbols_data sd;
 759       obj->read_symbols(&sd);
 760       obj->layout(symtab, layout, &sd);
 761       obj->add_symbols(symtab, &sd);
 762     }
 763   else
 764     {
 765       // FIXME: We need to close the descriptor here.
 766       delete obj;
 767     }
 768 }
 769
 770 // Print statistical information to stderr.  This is used for --stats.
 771
 772 void
 773 Archive::print_stats()
 774 {
 775   fprintf(stderr, _("%s: archive libraries: %u\n"),
 776           program_name, Archive::total_archives);
 777   fprintf(stderr, _("%s: total archive members: %u\n"),
 778           program_name, Archive::total_members);
 779   fprintf(stderr, _("%s: loaded archive members: %u\n"),
 780           program_name, Archive::total_members_loaded);
 781 }
 782
 783 // Add_archive_symbols methods.
 784
 785 Add_archive_symbols::~Add_archive_symbols()
 786 {
 787   if (this->this_blocker_ != NULL)
 788     delete this->this_blocker_;
 789   // next_blocker_ is deleted by the task associated with the next
 790   // input file.
 791 }
 792
 793 // Return whether we can add the archive symbols.  We are blocked by
 794 // this_blocker_.  We block next_blocker_.  We also lock the file.
 795
 796 Task_token*
 797 Add_archive_symbols::is_runnable()
 798 {
 799   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 800     return this->this_blocker_;
 801   return NULL;
 802 }
 803
 804 void
 805 Add_archive_symbols::locks(Task_locker* tl)
 806 {
 807   tl->add(this, this->next_blocker_);
 808   tl->add(this, this->archive_->token());
 809 }
 810
 811 void
 812 Add_archive_symbols::run(Workqueue*)
 813 {
 814   this->archive_->add_symbols(this->symtab_, this->layout_,
 815                               this->input_objects_, this->mapfile_);
 816
 817   this->archive_->unlock_nested_archives();
 818
 819   this->archive_->release();
 820   this->archive_->clear_uncached_views();
 821
 822   if (this->input_group_ != NULL)
 823     this->input_group_->add_archive(this->archive_);
 824   else
 825     {
 826       // We no longer need to know about this archive.
 827       delete this->archive_;
 828       this->archive_ = NULL;
 829     }
 830 }
 831
 832 } // End namespace gold.