gold/archive.cc

   1 // archive.cc -- archive support for gold
   2
   3 // Copyright 2006, 2007, 2008, 2009, 2010 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 #include "plugin.h"
  41
  42 namespace gold
  43 {
  44
  45 // The header of an entry in the archive.  This is all readable text,
  46 // padded with spaces where necesary.  If the contents of an archive
  47 // are all text file, the entire archive is readable.
  48
  49 struct Archive::Archive_header
  50 {
  51   // The entry name.
  52   char ar_name[16];
  53   // The file modification time.
  54   char ar_date[12];
  55   // The user's UID in decimal.
  56   char ar_uid[6];
  57   // The user's GID in decimal.
  58   char ar_gid[6];
  59   // The file mode in octal.
  60   char ar_mode[8];
  61   // The file size in decimal.
  62   char ar_size[10];
  63   // The final magic code.
  64   char ar_fmag[2];
  65 };
  66
  67 // Class Archive static variables.
  68 unsigned int Archive::total_archives;
  69 unsigned int Archive::total_members;
  70 unsigned int Archive::total_members_loaded;
  71
  72 // Archive methods.
  73
  74 const char Archive::armag[sarmag] =
  75 {
  76   '!', '<', 'a', 'r', 'c', 'h', '>', '\n'
  77 };
  78
  79 const char Archive::armagt[sarmag] =
  80 {
  81   '!', '<', 't', 'h', 'i', 'n', '>', '\n'
  82 };
  83
  84 const char Archive::arfmag[2] = { '`', '\n' };
  85
  86 Archive::Archive(const std::string& name, Input_file* input_file,
  87                  bool is_thin_archive, Dirsearch* dirpath, Task* task)
  88   : name_(name), input_file_(input_file), armap_(), armap_names_(),
  89     extended_names_(), armap_checked_(), seen_offsets_(), members_(),
  90     is_thin_archive_(is_thin_archive), included_member_(false),
  91     nested_archives_(), dirpath_(dirpath), task_(task), num_members_(0)
  92 {
  93   this->no_export_ =
  94     parameters->options().check_excluded_libs(input_file->found_name());
  95 }
  96
  97 // Set up the archive: read the symbol map and the extended name
  98 // table.
  99
 100 void
 101 Archive::setup()
 102 {
 103   // We need to ignore empty archives.
 104   if (this->input_file_->file().filesize() == sarmag)
 105     return;
 106
 107   // The first member of the archive should be the symbol table.
 108   std::string armap_name;
 109   section_size_type armap_size =
 110     convert_to_section_size_type(this->read_header(sarmag, false,
 111                                                    &armap_name, NULL));
 112   off_t off = sarmag;
 113   if (armap_name.empty())
 114     {
 115       this->read_armap(sarmag + sizeof(Archive_header), armap_size);
 116       off = sarmag + sizeof(Archive_header) + armap_size;
 117     }
 118   else if (!this->input_file_->options().whole_archive())
 119     gold_error(_("%s: no archive symbol table (run ranlib)"),
 120                this->name().c_str());
 121
 122   // See if there is an extended name table.  We cache these views
 123   // because it is likely that we will want to read the following
 124   // header in the add_symbols routine.
 125   if ((off & 1) != 0)
 126     ++off;
 127   std::string xname;
 128   section_size_type extended_size =
 129     convert_to_section_size_type(this->read_header(off, true, &xname, NULL));
 130   if (xname == "/")
 131     {
 132       const unsigned char* p = this->get_view(off + sizeof(Archive_header),
 133                                               extended_size, false, true);
 134       const char* px = reinterpret_cast<const char*>(p);
 135       this->extended_names_.assign(px, extended_size);
 136     }
 137   bool preread_syms = (parameters->options().threads()
 138                        && parameters->options().preread_archive_symbols());
 139 #ifndef ENABLE_THREADS
 140   preread_syms = false;
 141 #else
 142   if (parameters->options().has_plugins())
 143     preread_syms = false;
 144 #endif
 145   if (preread_syms)
 146     this->read_all_symbols();
 147 }
 148
 149 // Unlock any nested archives.
 150
 151 void
 152 Archive::unlock_nested_archives()
 153 {
 154   for (Nested_archive_table::iterator p = this->nested_archives_.begin();
 155        p != this->nested_archives_.end();
 156        ++p)
 157     {
 158       p->second->unlock(this->task_);
 159     }
 160 }
 161
 162 // Read the archive symbol map.
 163
 164 void
 165 Archive::read_armap(off_t start, section_size_type size)
 166 {
 167   // To count the total number of archive members, we'll just count
 168   // the number of times the file offset changes.  Since most archives
 169   // group the symbols in the armap by object, this ought to give us
 170   // an accurate count.
 171   off_t last_seen_offset = -1;
 172
 173   // Read in the entire armap.
 174   const unsigned char* p = this->get_view(start, size, true, false);
 175
 176   // Numbers in the armap are always big-endian.
 177   const elfcpp::Elf_Word* pword = reinterpret_cast<const elfcpp::Elf_Word*>(p);
 178   unsigned int nsyms = elfcpp::Swap<32, true>::readval(pword);
 179   ++pword;
 180
 181   // Note that the addition is in units of sizeof(elfcpp::Elf_Word).
 182   const char* pnames = reinterpret_cast<const char*>(pword + nsyms);
 183   section_size_type names_size =
 184     reinterpret_cast<const char*>(p) + size - pnames;
 185   this->armap_names_.assign(pnames, names_size);
 186
 187   this->armap_.resize(nsyms);
 188
 189   section_offset_type name_offset = 0;
 190   for (unsigned int i = 0; i < nsyms; ++i)
 191     {
 192       this->armap_[i].name_offset = name_offset;
 193       this->armap_[i].file_offset = elfcpp::Swap<32, true>::readval(pword);
 194       name_offset += strlen(pnames + name_offset) + 1;
 195       ++pword;
 196       if (this->armap_[i].file_offset != last_seen_offset)
 197         {
 198           last_seen_offset = this->armap_[i].file_offset;
 199           ++this->num_members_;
 200         }
 201     }
 202
 203   if (static_cast<section_size_type>(name_offset) > names_size)
 204     gold_error(_("%s: bad archive symbol table names"),
 205                this->name().c_str());
 206
 207   // This array keeps track of which symbols are for archive elements
 208   // which we have already included in the link.
 209   this->armap_checked_.resize(nsyms);
 210 }
 211
 212 // Read the header of an archive member at OFF.  Fail if something
 213 // goes wrong.  Return the size of the member.  Set *PNAME to the name
 214 // of the member.
 215
 216 off_t
 217 Archive::read_header(off_t off, bool cache, std::string* pname,
 218                      off_t* nested_off)
 219 {
 220   const unsigned char* p = this->get_view(off, sizeof(Archive_header), true,
 221                                           cache);
 222   const Archive_header* hdr = reinterpret_cast<const Archive_header*>(p);
 223   return this->interpret_header(hdr, off,  pname, nested_off);
 224 }
 225
 226 // Interpret the header of HDR, the header of the archive member at
 227 // file offset OFF.  Fail if something goes wrong.  Return the size of
 228 // the member.  Set *PNAME to the name of the member.
 229
 230 off_t
 231 Archive::interpret_header(const Archive_header* hdr, off_t off,
 232                           std::string* pname, off_t* nested_off) const
 233 {
 234   if (memcmp(hdr->ar_fmag, arfmag, sizeof arfmag) != 0)
 235     {
 236       gold_error(_("%s: malformed archive header at %zu"),
 237                  this->name().c_str(), static_cast<size_t>(off));
 238       return this->input_file_->file().filesize() - off;
 239     }
 240
 241   const int size_string_size = sizeof hdr->ar_size;
 242   char size_string[size_string_size + 1];
 243   memcpy(size_string, hdr->ar_size, size_string_size);
 244   char* ps = size_string + size_string_size;
 245   while (ps[-1] == ' ')
 246     --ps;
 247   *ps = '\0';
 248
 249   errno = 0;
 250   char* end;
 251   off_t member_size = strtol(size_string, &end, 10);
 252   if (*end != '\0'
 253       || member_size < 0
 254       || (member_size == LONG_MAX && errno == ERANGE))
 255     {
 256       gold_error(_("%s: malformed archive header size at %zu"),
 257                  this->name().c_str(), static_cast<size_t>(off));
 258       return this->input_file_->file().filesize() - off;
 259     }
 260
 261   if (hdr->ar_name[0] != '/')
 262     {
 263       const char* name_end = strchr(hdr->ar_name, '/');
 264       if (name_end == NULL
 265           || name_end - hdr->ar_name >= static_cast<int>(sizeof hdr->ar_name))
 266         {
 267           gold_error(_("%s: malformed archive header name at %zu"),
 268                      this->name().c_str(), static_cast<size_t>(off));
 269           return this->input_file_->file().filesize() - off;
 270         }
 271       pname->assign(hdr->ar_name, name_end - hdr->ar_name);
 272       if (nested_off != NULL)
 273         *nested_off = 0;
 274     }
 275   else if (hdr->ar_name[1] == ' ')
 276     {
 277       // This is the symbol table.
 278       if (!pname->empty())
 279         pname->clear();
 280     }
 281   else if (hdr->ar_name[1] == '/')
 282     {
 283       // This is the extended name table.
 284       pname->assign(1, '/');
 285     }
 286   else
 287     {
 288       errno = 0;
 289       long x = strtol(hdr->ar_name + 1, &end, 10);
 290       long y = 0;
 291       if (*end == ':')
 292         y = strtol(end + 1, &end, 10);
 293       if (*end != ' '
 294           || x < 0
 295           || (x == LONG_MAX && errno == ERANGE)
 296           || static_cast<size_t>(x) >= this->extended_names_.size())
 297         {
 298           gold_error(_("%s: bad extended name index at %zu"),
 299                      this->name().c_str(), static_cast<size_t>(off));
 300           return this->input_file_->file().filesize() - off;
 301         }
 302
 303       const char* name = this->extended_names_.data() + x;
 304       const char* name_end = strchr(name, '\n');
 305       if (static_cast<size_t>(name_end - name) > this->extended_names_.size()
 306           || name_end[-1] != '/')
 307         {
 308           gold_error(_("%s: bad extended name entry at header %zu"),
 309                      this->name().c_str(), static_cast<size_t>(off));
 310           return this->input_file_->file().filesize() - off;
 311         }
 312       pname->assign(name, name_end - 1 - name);
 313       if (nested_off != NULL)
 314         *nested_off = y;
 315     }
 316
 317   return member_size;
 318 }
 319
 320 // An archive member iterator.
 321
 322 class Archive::const_iterator
 323 {
 324  public:
 325   // The header of an archive member.  This is what this iterator
 326   // points to.
 327   struct Header
 328   {
 329     // The name of the member.
 330     std::string name;
 331     // The file offset of the member.
 332     off_t off;
 333     // The file offset of a nested archive member.
 334     off_t nested_off;
 335     // The size of the member.
 336     off_t size;
 337   };
 338
 339   const_iterator(Archive* archive, off_t off)
 340     : archive_(archive), off_(off)
 341   { this->read_next_header(); }
 342
 343   const Header&
 344   operator*() const
 345   { return this->header_; }
 346
 347   const Header*
 348   operator->() const
 349   { return &this->header_; }
 350
 351   const_iterator&
 352   operator++()
 353   {
 354     if (this->off_ == this->archive_->file().filesize())
 355       return *this;
 356     this->off_ += sizeof(Archive_header);
 357     if (!this->archive_->is_thin_archive())
 358       this->off_ += this->header_.size;
 359     if ((this->off_ & 1) != 0)
 360       ++this->off_;
 361     this->read_next_header();
 362     return *this;
 363   }
 364
 365   const_iterator
 366   operator++(int)
 367   {
 368     const_iterator ret = *this;
 369     ++*this;
 370     return ret;
 371   }
 372
 373   bool
 374   operator==(const const_iterator p) const
 375   { return this->off_ == p->off; }
 376
 377   bool
 378   operator!=(const const_iterator p) const
 379   { return this->off_ != p->off; }
 380
 381  private:
 382   void
 383   read_next_header();
 384
 385   // The underlying archive.
 386   Archive* archive_;
 387   // The current offset in the file.
 388   off_t off_;
 389   // The current archive header.
 390   Header header_;
 391 };
 392
 393 // Read the next archive header.
 394
 395 void
 396 Archive::const_iterator::read_next_header()
 397 {
 398   off_t filesize = this->archive_->file().filesize();
 399   while (true)
 400     {
 401       if (filesize - this->off_ < static_cast<off_t>(sizeof(Archive_header)))
 402         {
 403           if (filesize != this->off_)
 404             {
 405               gold_error(_("%s: short archive header at %zu"),
 406                          this->archive_->filename().c_str(),
 407                          static_cast<size_t>(this->off_));
 408               this->off_ = filesize;
 409             }
 410           this->header_.off = filesize;
 411           return;
 412         }
 413
 414       unsigned char buf[sizeof(Archive_header)];
 415       this->archive_->file().read(this->off_, sizeof(Archive_header), buf);
 416
 417       const Archive_header* hdr = reinterpret_cast<const Archive_header*>(buf);
 418       this->header_.size =
 419         this->archive_->interpret_header(hdr, this->off_, &this->header_.name,
 420                                          &this->header_.nested_off);
 421       this->header_.off = this->off_;
 422
 423       // Skip special members.
 424       if (!this->header_.name.empty() && this->header_.name != "/")
 425         return;
 426
 427       this->off_ += sizeof(Archive_header) + this->header_.size;
 428       if ((this->off_ & 1) != 0)
 429         ++this->off_;
 430     }
 431 }
 432
 433 // Initial iterator.
 434
 435 Archive::const_iterator
 436 Archive::begin()
 437 {
 438   return Archive::const_iterator(this, sarmag);
 439 }
 440
 441 // Final iterator.
 442
 443 Archive::const_iterator
 444 Archive::end()
 445 {
 446   return Archive::const_iterator(this, this->input_file_->file().filesize());
 447 }
 448
 449 // Get the file and offset for an archive member, which may be an
 450 // external member of a thin archive.  Set *INPUT_FILE to the
 451 // file containing the actual member, *MEMOFF to the offset
 452 // within that file (0 if not a nested archive), and *MEMBER_NAME
 453 // to the name of the archive member.  Return TRUE on success.
 454
 455 bool
 456 Archive::get_file_and_offset(off_t off, Input_file** input_file, off_t* memoff,
 457                              off_t* memsize, std::string* member_name)
 458 {
 459   off_t nested_off;
 460
 461   *memsize = this->read_header(off, false, member_name, &nested_off);
 462
 463   *input_file = this->input_file_;
 464   *memoff = off + static_cast<off_t>(sizeof(Archive_header));
 465
 466   if (!this->is_thin_archive_)
 467     return true;
 468
 469   // Adjust a relative pathname so that it is relative
 470   // to the directory containing the archive.
 471   if (!IS_ABSOLUTE_PATH(member_name->c_str()))
 472     {
 473       const char* arch_path = this->filename().c_str();
 474       const char* basename = lbasename(arch_path);
 475       if (basename > arch_path)
 476         member_name->replace(0, 0,
 477                              this->filename().substr(0, basename - arch_path));
 478     }
 479
 480   if (nested_off > 0)
 481     {
 482       // This is a member of a nested archive.  Open the containing
 483       // archive if we don't already have it open, then do a recursive
 484       // call to include the member from that archive.
 485       Archive* arch;
 486       Nested_archive_table::const_iterator p =
 487         this->nested_archives_.find(*member_name);
 488       if (p != this->nested_archives_.end())
 489         arch = p->second;
 490       else
 491         {
 492           Input_file_argument* input_file_arg =
 493             new Input_file_argument(member_name->c_str(),
 494                                     Input_file_argument::INPUT_FILE_TYPE_FILE,
 495                                     "", false, parameters->options());
 496           *input_file = new Input_file(input_file_arg);
 497           int dummy = 0;
 498           if (!(*input_file)->open(*this->dirpath_, this->task_, &dummy))
 499             return false;
 500           arch = new Archive(*member_name, *input_file, false, this->dirpath_,
 501                              this->task_);
 502           arch->setup();
 503           std::pair<Nested_archive_table::iterator, bool> ins =
 504             this->nested_archives_.insert(std::make_pair(*member_name, arch));
 505           gold_assert(ins.second);
 506         }
 507       return arch->get_file_and_offset(nested_off, input_file, memoff,
 508                                        memsize, member_name);
 509     }
 510
 511   // This is an external member of a thin archive.  Open the
 512   // file as a regular relocatable object file.
 513   Input_file_argument* input_file_arg =
 514       new Input_file_argument(member_name->c_str(),
 515                               Input_file_argument::INPUT_FILE_TYPE_FILE,
 516                               "", false, this->input_file_->options());
 517   *input_file = new Input_file(input_file_arg);
 518   int dummy = 0;
 519   if (!(*input_file)->open(*this->dirpath_, this->task_, &dummy))
 520     return false;
 521
 522   *memoff = 0;
 523   *memsize = (*input_file)->file().filesize();
 524   return true;
 525 }
 526
 527 // Return an ELF object for the member at offset OFF.  If the ELF
 528 // object has an unsupported target type, set *PUNCONFIGURED to true
 529 // and return NULL.
 530
 531 Object*
 532 Archive::get_elf_object_for_member(off_t off, bool* punconfigured)
 533 {
 534   *punconfigured = false;
 535
 536   Input_file* input_file;
 537   off_t memoff;
 538   off_t memsize;
 539   std::string member_name;
 540   if (!this->get_file_and_offset(off, &input_file, &memoff, &memsize,
 541                                  &member_name))
 542     return NULL;
 543
 544   if (parameters->options().has_plugins())
 545     {
 546       Object* obj = parameters->options().plugins()->claim_file(input_file,
 547                                                                 memoff,
 548                                                                 memsize);
 549       if (obj != NULL)
 550         {
 551           // The input file was claimed by a plugin, and its symbols
 552           // have been provided by the plugin.
 553           return obj;
 554         }
 555     }
 556
 557   const unsigned char* ehdr;
 558   int read_size;
 559   if (!is_elf_object(input_file, memoff, &ehdr, &read_size))
 560     {
 561       gold_error(_("%s: member at %zu is not an ELF object"),
 562                  this->name().c_str(), static_cast<size_t>(off));
 563       return NULL;
 564     }
 565
 566   Object *obj = make_elf_object((std::string(this->input_file_->filename())
 567                                  + "(" + member_name + ")"),
 568                                 input_file, memoff, ehdr, read_size,
 569                                 punconfigured);
 570   if (obj == NULL)
 571     return NULL;
 572   obj->set_no_export(this->no_export());
 573   return obj;
 574 }
 575
 576 // Read the symbols from all the archive members in the link.
 577
 578 void
 579 Archive::read_all_symbols()
 580 {
 581   for (Archive::const_iterator p = this->begin();
 582        p != this->end();
 583        ++p)
 584     this->read_symbols(p->off);
 585 }
 586
 587 // Read the symbols from an archive member in the link.  OFF is the file
 588 // offset of the member header.
 589
 590 void
 591 Archive::read_symbols(off_t off)
 592 {
 593   bool dummy;
 594   Object* obj = this->get_elf_object_for_member(off, &dummy);
 595
 596   if (obj == NULL)
 597     return;
 598
 599   Read_symbols_data* sd = new Read_symbols_data;
 600   obj->read_symbols(sd);
 601   Archive_member member(obj, sd);
 602   this->members_[off] = member;
 603 }
 604
 605 Archive::Should_include
 606 Archive::should_include_member(Symbol_table* symtab, const char* sym_name,
 607                                Symbol** symp, std::string* why, char** tmpbufp,
 608                                size_t* tmpbuflen)
 609 {
 610   // In an object file, and therefore in an archive map, an
 611   // '@' in the name separates the symbol name from the
 612   // version name.  If there are two '@' characters, this is
 613   // the default version.
 614   char* tmpbuf = *tmpbufp;
 615   const char* ver = strchr(sym_name, '@');
 616   bool def = false;
 617   if (ver != NULL)
 618     {
 619       size_t symlen = ver - sym_name;
 620       if (symlen + 1 > *tmpbuflen)
 621         {
 622           tmpbuf = static_cast<char*>(xrealloc(tmpbuf, symlen + 1));
 623           *tmpbufp = tmpbuf;
 624           *tmpbuflen = symlen + 1;
 625         }
 626       memcpy(tmpbuf, sym_name, symlen);
 627       tmpbuf[symlen] = '\0';
 628       sym_name = tmpbuf;
 629
 630       ++ver;
 631       if (*ver == '@')
 632         {
 633           ++ver;
 634           def = true;
 635         }
 636     }
 637
 638   Symbol* sym = symtab->lookup(sym_name, ver);
 639   if (def
 640       && ver != NULL
 641       && (sym == NULL
 642           || !sym->is_undefined()
 643           || sym->binding() == elfcpp::STB_WEAK))
 644     sym = symtab->lookup(sym_name, NULL);
 645
 646   *symp = sym;
 647
 648   if (sym == NULL)
 649     {
 650       // Check whether the symbol was named in a -u option.
 651       if (!parameters->options().is_undefined(sym_name))
 652         return Archive::SHOULD_INCLUDE_UNKNOWN;
 653       else
 654         {
 655           *why = "-u ";
 656           *why += sym_name;
 657         }
 658     }
 659   else if (!sym->is_undefined())
 660     return Archive::SHOULD_INCLUDE_NO;
 661   else if (sym->binding() == elfcpp::STB_WEAK)
 662     return Archive::SHOULD_INCLUDE_UNKNOWN;
 663
 664   return Archive::SHOULD_INCLUDE_YES;
 665 }
 666
 667 // Select members from the archive and add them to the link.  We walk
 668 // through the elements in the archive map, and look each one up in
 669 // the symbol table.  If it exists as a strong undefined symbol, we
 670 // pull in the corresponding element.  We have to do this in a loop,
 671 // since pulling in one element may create new undefined symbols which
 672 // may be satisfied by other objects in the archive.  Return true in
 673 // the normal case, false if the first member we tried to add from
 674 // this archive had an incompatible target.
 675
 676 bool
 677 Archive::add_symbols(Symbol_table* symtab, Layout* layout,
 678                      Input_objects* input_objects, Mapfile* mapfile)
 679 {
 680   ++Archive::total_archives;
 681
 682   if (this->input_file_->options().whole_archive())
 683     return this->include_all_members(symtab, layout, input_objects,
 684                                      mapfile);
 685
 686   Archive::total_members += this->num_members_;
 687
 688   input_objects->archive_start(this);
 689
 690   const size_t armap_size = this->armap_.size();
 691
 692   // This is a quick optimization, since we usually see many symbols
 693   // in a row with the same offset.  last_seen_offset holds the last
 694   // offset we saw that was present in the seen_offsets_ set.
 695   off_t last_seen_offset = -1;
 696
 697   // Track which symbols in the symbol table we've already found to be
 698   // defined.
 699
 700   char* tmpbuf = NULL;
 701   size_t tmpbuflen = 0;
 702   bool added_new_object;
 703   do
 704     {
 705       added_new_object = false;
 706       for (size_t i = 0; i < armap_size; ++i)
 707         {
 708           if (this->armap_checked_[i])
 709             continue;
 710           if (this->armap_[i].file_offset == last_seen_offset)
 711             {
 712               this->armap_checked_[i] = true;
 713               continue;
 714             }
 715           if (this->seen_offsets_.find(this->armap_[i].file_offset)
 716               != this->seen_offsets_.end())
 717             {
 718               this->armap_checked_[i] = true;
 719               last_seen_offset = this->armap_[i].file_offset;
 720               continue;
 721             }
 722
 723           const char* sym_name = (this->armap_names_.data()
 724                                   + this->armap_[i].name_offset);
 725
 726           Symbol* sym;
 727           std::string why;
 728           Archive::Should_include t =
 729               Archive::should_include_member(symtab, sym_name, &sym, &why,
 730                                              &tmpbuf, &tmpbuflen);
 731
 732           if (t == Archive::SHOULD_INCLUDE_NO
 733               || t == Archive::SHOULD_INCLUDE_YES)
 734             this->armap_checked_[i] = true;
 735
 736           if (t != Archive::SHOULD_INCLUDE_YES)
 737             continue;
 738
 739           // We want to include this object in the link.
 740           last_seen_offset = this->armap_[i].file_offset;
 741           this->seen_offsets_.insert(last_seen_offset);
 742
 743           if (!this->include_member(symtab, layout, input_objects,
 744                                     last_seen_offset, mapfile, sym,
 745                                     why.c_str()))
 746             {
 747               if (tmpbuf != NULL)
 748                 free(tmpbuf);
 749               return false;
 750             }
 751
 752           added_new_object = true;
 753         }
 754     }
 755   while (added_new_object);
 756
 757   if (tmpbuf != NULL)
 758     free(tmpbuf);
 759
 760   input_objects->archive_stop(this);
 761
 762   return true;
 763 }
 764
 765 // Include all the archive members in the link.  This is for --whole-archive.
 766
 767 bool
 768 Archive::include_all_members(Symbol_table* symtab, Layout* layout,
 769                              Input_objects* input_objects, Mapfile* mapfile)
 770 {
 771   input_objects->archive_start(this);
 772
 773   if (this->members_.size() > 0)
 774     {
 775       std::map<off_t, Archive_member>::const_iterator p;
 776       for (p = this->members_.begin();
 777            p != this->members_.end();
 778            ++p)
 779         {
 780           if (!this->include_member(symtab, layout, input_objects, p->first,
 781                                     mapfile, NULL, "--whole-archive"))
 782             return false;
 783           ++Archive::total_members;
 784         }
 785     }
 786   else
 787     {
 788       for (Archive::const_iterator p = this->begin();
 789            p != this->end();
 790            ++p)
 791         {
 792           if (!this->include_member(symtab, layout, input_objects, p->off,
 793                                     mapfile, NULL, "--whole-archive"))
 794             return false;
 795           ++Archive::total_members;
 796         }
 797     }
 798
 799   input_objects->archive_stop(this);
 800
 801   return true;
 802 }
 803
 804 // Return the number of members in the archive.  This is only used for
 805 // reports.
 806
 807 size_t
 808 Archive::count_members()
 809 {
 810   size_t ret = 0;
 811   for (Archive::const_iterator p = this->begin();
 812        p != this->end();
 813        ++p)
 814     ++ret;
 815   return ret;
 816 }
 817
 818 // Include an archive member in the link.  OFF is the file offset of
 819 // the member header.  WHY is the reason we are including this member.
 820 // Return true if we added the member or if we had an error, return
 821 // false if this was the first member we tried to add from this
 822 // archive and it had an incompatible format.
 823
 824 bool
 825 Archive::include_member(Symbol_table* symtab, Layout* layout,
 826                         Input_objects* input_objects, off_t off,
 827                         Mapfile* mapfile, Symbol* sym, const char* why)
 828 {
 829   ++Archive::total_members_loaded;
 830
 831   std::map<off_t, Archive_member>::const_iterator p = this->members_.find(off);
 832   if (p != this->members_.end())
 833     {
 834       Object *obj = p->second.obj_;
 835
 836       Read_symbols_data *sd = p->second.sd_;
 837       if (mapfile != NULL)
 838         mapfile->report_include_archive_member(obj->name(), sym, why);
 839       if (input_objects->add_object(obj))
 840         {
 841           obj->layout(symtab, layout, sd);
 842           obj->add_symbols(symtab, sd, layout);
 843           this->included_member_ = true;
 844         }
 845       delete sd;
 846       return true;
 847     }
 848
 849   bool unconfigured;
 850   Object* obj = this->get_elf_object_for_member(off, &unconfigured);
 851
 852   if (!this->included_member_
 853       && this->searched_for()
 854       && obj == NULL
 855       && unconfigured)
 856     {
 857       if (obj != NULL)
 858         delete obj;
 859       return false;
 860     }
 861
 862   if (obj == NULL)
 863     return true;
 864
 865   if (mapfile != NULL)
 866     mapfile->report_include_archive_member(obj->name(), sym, why);
 867
 868   Pluginobj* pluginobj = obj->pluginobj();
 869   if (pluginobj != NULL)
 870     {
 871       pluginobj->add_symbols(symtab, NULL, layout);
 872       this->included_member_ = true;
 873       return true;
 874     }
 875
 876   if (!input_objects->add_object(obj))
 877     delete obj;
 878   else
 879     {
 880       Read_symbols_data sd;
 881       obj->read_symbols(&sd);
 882       obj->layout(symtab, layout, &sd);
 883       obj->add_symbols(symtab, &sd, layout);
 884
 885       // If this is an external member of a thin archive, unlock the file
 886       // for the next task.
 887       if (obj->offset() == 0)
 888         obj->unlock(this->task_);
 889
 890       this->included_member_ = true;
 891     }
 892
 893   return true;
 894 }
 895
 896 // Print statistical information to stderr.  This is used for --stats.
 897
 898 void
 899 Archive::print_stats()
 900 {
 901   fprintf(stderr, _("%s: archive libraries: %u\n"),
 902           program_name, Archive::total_archives);
 903   fprintf(stderr, _("%s: total archive members: %u\n"),
 904           program_name, Archive::total_members);
 905   fprintf(stderr, _("%s: loaded archive members: %u\n"),
 906           program_name, Archive::total_members_loaded);
 907 }
 908
 909 // Add_archive_symbols methods.
 910
 911 Add_archive_symbols::~Add_archive_symbols()
 912 {
 913   if (this->this_blocker_ != NULL)
 914     delete this->this_blocker_;
 915   // next_blocker_ is deleted by the task associated with the next
 916   // input file.
 917 }
 918
 919 // Return whether we can add the archive symbols.  We are blocked by
 920 // this_blocker_.  We block next_blocker_.  We also lock the file.
 921
 922 Task_token*
 923 Add_archive_symbols::is_runnable()
 924 {
 925   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
 926     return this->this_blocker_;
 927   return NULL;
 928 }
 929
 930 void
 931 Add_archive_symbols::locks(Task_locker* tl)
 932 {
 933   tl->add(this, this->next_blocker_);
 934   tl->add(this, this->archive_->token());
 935 }
 936
 937 void
 938 Add_archive_symbols::run(Workqueue* workqueue)
 939 {
 940   bool added = this->archive_->add_symbols(this->symtab_, this->layout_,
 941                                            this->input_objects_,
 942                                            this->mapfile_);
 943   this->archive_->unlock_nested_archives();
 944
 945   this->archive_->release();
 946   this->archive_->clear_uncached_views();
 947
 948   if (!added)
 949     {
 950       // This archive holds object files which are incompatible with
 951       // our output file.
 952       Read_symbols::incompatible_warning(this->input_argument_,
 953                                          this->archive_->input_file());
 954       Read_symbols::requeue(workqueue, this->input_objects_, this->symtab_,
 955                             this->layout_, this->dirpath_, this->dirindex_,
 956                             this->mapfile_, this->input_argument_,
 957                             this->input_group_, this->next_blocker_);
 958       delete this->archive_;
 959       return;
 960     }
 961
 962   if (this->input_group_ != NULL)
 963     this->input_group_->add_archive(this->archive_);
 964   else
 965     {
 966       // We no longer need to know about this archive.
 967       delete this->archive_;
 968       this->archive_ = NULL;
 969     }
 970 }
 971
 972 // Class Lib_group static variables.
 973 unsigned int Lib_group::total_lib_groups;
 974 unsigned int Lib_group::total_members;
 975 unsigned int Lib_group::total_members_loaded;
 976
 977 Lib_group::Lib_group(const Input_file_lib* lib, Task* task)
 978   : lib_(lib), task_(task), members_()
 979 {
 980   this->members_.resize(lib->size());
 981 }
 982
 983 // Select members from the lib group and add them to the link.  We walk
 984 // through the the members, and check if each one up should be included.
 985 // If the object says it should be included, we do so.  We have to do
 986 // this in a loop, since including one member may create new undefined
 987 // symbols which may be satisfied by other members.
 988
 989 void
 990 Lib_group::add_symbols(Symbol_table* symtab, Layout* layout,
 991                        Input_objects* input_objects)
 992 {
 993   ++Lib_group::total_lib_groups;
 994
 995   Lib_group::total_members += this->members_.size();
 996
 997   bool added_new_object;
 998   do
 999     {
1000       added_new_object = false;
1001       unsigned int i = 0;
1002       while (i < this->members_.size())
1003         {
1004           const Archive_member& member = this->members_[i];
1005           Object *obj = member.obj_;
1006           std::string why;
1007
1008           // Skip files with no symbols. Plugin objects have
1009           // member.sd_ == NULL.
1010           if (obj != NULL
1011               && (member.sd_ == NULL || member.sd_->symbol_names != NULL))
1012             {
1013               Archive::Should_include t = obj->should_include_member(symtab,
1014                                                                      member.sd_,
1015                                                                      &why);
1016
1017               if (t != Archive::SHOULD_INCLUDE_YES)
1018                 {
1019                   ++i;
1020                   continue;
1021                 }
1022
1023               this->include_member(symtab, layout, input_objects, member);
1024
1025               added_new_object = true;
1026             }
1027           else
1028             {
1029               if (member.sd_ != NULL)
1030                 delete member.sd_;
1031             }
1032
1033           this->members_[i] = this->members_.back();
1034           this->members_.pop_back();
1035         }
1036     }
1037   while (added_new_object);
1038 }
1039
1040 // Include a lib group member in the link.
1041
1042 void
1043 Lib_group::include_member(Symbol_table* symtab, Layout* layout,
1044                           Input_objects* input_objects,
1045                           const Archive_member& member)
1046 {
1047   ++Lib_group::total_members_loaded;
1048
1049   Object* obj = member.obj_;
1050   gold_assert(obj != NULL);
1051
1052   Pluginobj* pluginobj = obj->pluginobj();
1053   if (pluginobj != NULL)
1054     {
1055       pluginobj->add_symbols(symtab, NULL, layout);
1056       return;
1057     }
1058
1059   Read_symbols_data* sd = member.sd_;
1060   gold_assert(sd != NULL);
1061   obj->lock(this->task_);
1062   if (input_objects->add_object(obj))
1063     {
1064       obj->layout(symtab, layout, sd);
1065       obj->add_symbols(symtab, sd, layout);
1066       // Unlock the file for the next task.
1067       obj->unlock(this->task_);
1068     }
1069   delete sd;
1070 }
1071
1072 // Print statistical information to stderr.  This is used for --stats.
1073
1074 void
1075 Lib_group::print_stats()
1076 {
1077   fprintf(stderr, _("%s: lib groups: %u\n"),
1078           program_name, Lib_group::total_lib_groups);
1079   fprintf(stderr, _("%s: total lib groups members: %u\n"),
1080           program_name, Lib_group::total_members);
1081   fprintf(stderr, _("%s: loaded lib groups members: %u\n"),
1082           program_name, Lib_group::total_members_loaded);
1083 }
1084
1085 Task_token*
1086 Add_lib_group_symbols::is_runnable()
1087 {
1088   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
1089     return this->this_blocker_;
1090   return NULL;
1091 }
1092
1093 void
1094 Add_lib_group_symbols::locks(Task_locker* tl)
1095 {
1096   tl->add(this, this->next_blocker_);
1097 }
1098
1099 void
1100 Add_lib_group_symbols::run(Workqueue*)
1101 {
1102   this->lib_->add_symbols(this->symtab_, this->layout_, this->input_objects_);
1103 }
1104
1105 Add_lib_group_symbols::~Add_lib_group_symbols()
1106 {
1107   if (this->this_blocker_ != NULL)
1108     delete this->this_blocker_;
1109   // next_blocker_ is deleted by the task associated with the next
1110   // input file.
1111 }
1112
1113 } // End namespace gold.