gold/fileread.cc

   1 // fileread.cc -- read files 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 <cstring>
  26 #include <cerrno>
  27 #include <fcntl.h>
  28 #include <unistd.h>
  29 #include <sys/mman.h>
  30 #include <sys/uio.h>
  31 #include "filenames.h"
  32
  33 #include "debug.h"
  34 #include "parameters.h"
  35 #include "options.h"
  36 #include "dirsearch.h"
  37 #include "target.h"
  38 #include "binary.h"
  39 #include "fileread.h"
  40
  41 namespace gold
  42 {
  43
  44 // Class File_read::View.
  45
  46 File_read::View::~View()
  47 {
  48   gold_assert(!this->is_locked());
  49   if (!this->mapped_)
  50     delete[] this->data_;
  51   else
  52     {
  53       if (::munmap(const_cast<unsigned char*>(this->data_), this->size_) != 0)
  54         gold_warning(_("munmap failed: %s"), strerror(errno));
  55
  56       File_read::current_mapped_bytes -= this->size_;
  57     }
  58 }
  59
  60 void
  61 File_read::View::lock()
  62 {
  63   ++this->lock_count_;
  64 }
  65
  66 void
  67 File_read::View::unlock()
  68 {
  69   gold_assert(this->lock_count_ > 0);
  70   --this->lock_count_;
  71 }
  72
  73 bool
  74 File_read::View::is_locked()
  75 {
  76   return this->lock_count_ > 0;
  77 }
  78
  79 // Class File_read.
  80
  81 // The File_read static variables.
  82 unsigned long long File_read::total_mapped_bytes;
  83 unsigned long long File_read::current_mapped_bytes;
  84 unsigned long long File_read::maximum_mapped_bytes;
  85
  86 // The File_read class is designed to support file descriptor caching,
  87 // but this is not currently implemented.
  88
  89 File_read::~File_read()
  90 {
  91   gold_assert(this->token_.is_writable());
  92   if (this->descriptor_ >= 0)
  93     {
  94       if (close(this->descriptor_) < 0)
  95         gold_warning(_("close of %s failed: %s"),
  96                      this->name_.c_str(), strerror(errno));
  97       this->descriptor_ = -1;
  98     }
  99   this->name_.clear();
 100   this->clear_views(true);
 101 }
 102
 103 // Open the file.
 104
 105 bool
 106 File_read::open(const Task* task, const std::string& name)
 107 {
 108   gold_assert(this->token_.is_writable()
 109               && this->descriptor_ < 0
 110               && this->name_.empty());
 111   this->name_ = name;
 112
 113   this->descriptor_ = ::open(this->name_.c_str(), O_RDONLY);
 114
 115   if (this->descriptor_ >= 0)
 116     {
 117       struct stat s;
 118       if (::fstat(this->descriptor_, &s) < 0)
 119         gold_error(_("%s: fstat failed: %s"),
 120                    this->name_.c_str(), strerror(errno));
 121       this->size_ = s.st_size;
 122       gold_debug(DEBUG_FILES, "Attempt to open %s succeeded",
 123                  this->name_.c_str());
 124     }
 125
 126   this->token_.add_writer(task);
 127
 128   return this->descriptor_ >= 0;
 129 }
 130
 131 // Open the file with the contents in memory.
 132
 133 bool
 134 File_read::open(const Task* task, const std::string& name,
 135                 const unsigned char* contents, off_t size)
 136 {
 137   gold_assert(this->token_.is_writable()
 138               && this->descriptor_ < 0
 139               && this->name_.empty());
 140   this->name_ = name;
 141   this->contents_ = contents;
 142   this->size_ = size;
 143   this->token_.add_writer(task);
 144   return true;
 145 }
 146
 147 // Release the file.  This is called when we are done with the file in
 148 // a Task.
 149
 150 void
 151 File_read::release()
 152 {
 153   gold_assert(this->is_locked());
 154
 155   File_read::total_mapped_bytes += this->mapped_bytes_;
 156   File_read::current_mapped_bytes += this->mapped_bytes_;
 157   this->mapped_bytes_ = 0;
 158   if (File_read::current_mapped_bytes > File_read::maximum_mapped_bytes)
 159     File_read::maximum_mapped_bytes = File_read::current_mapped_bytes;
 160
 161   // Only clear views if there is only one attached object.  Otherwise
 162   // we waste time trying to clear cached archive views.
 163   if (this->object_count_ <= 1)
 164     this->clear_views(false);
 165
 166   this->released_ = true;
 167 }
 168
 169 // Lock the file.
 170
 171 void
 172 File_read::lock(const Task* task)
 173 {
 174   gold_assert(this->released_);
 175   this->token_.add_writer(task);
 176   this->released_ = false;
 177 }
 178
 179 // Unlock the file.
 180
 181 void
 182 File_read::unlock(const Task* task)
 183 {
 184   this->release();
 185   this->token_.remove_writer(task);
 186 }
 187
 188 // Return whether the file is locked.
 189
 190 bool
 191 File_read::is_locked() const
 192 {
 193   if (!this->token_.is_writable())
 194     return true;
 195   // The file is not locked, so it should have been released.
 196   gold_assert(this->released_);
 197   return false;
 198 }
 199
 200 // See if we have a view which covers the file starting at START for
 201 // SIZE bytes.  Return a pointer to the View if found, NULL if not.
 202 // If BYTESHIFT is not -1U, the returned View must have the specified
 203 // byte shift; otherwise, it may have any byte shift.  If VSHIFTED is
 204 // not NULL, this sets *VSHIFTED to a view which would have worked if
 205 // not for the requested BYTESHIFT.
 206
 207 inline File_read::View*
 208 File_read::find_view(off_t start, section_size_type size,
 209                      unsigned int byteshift, File_read::View** vshifted) const
 210 {
 211   if (vshifted != NULL)
 212     *vshifted = NULL;
 213
 214   off_t page = File_read::page_offset(start);
 215
 216   unsigned int bszero = 0;
 217   Views::const_iterator p = this->views_.upper_bound(std::make_pair(page - 1,
 218                                                                     bszero));
 219
 220   while (p != this->views_.end() && p->first.first <= page)
 221     {
 222       if (p->second->start() <= start
 223           && (p->second->start() + static_cast<off_t>(p->second->size())
 224               >= start + static_cast<off_t>(size)))
 225         {
 226           if (byteshift == -1U || byteshift == p->second->byteshift())
 227             {
 228               p->second->set_accessed();
 229               return p->second;
 230             }
 231
 232           if (vshifted != NULL && *vshifted == NULL)
 233             *vshifted = p->second;
 234         }
 235
 236       ++p;
 237     }
 238
 239   return NULL;
 240 }
 241
 242 // Read SIZE bytes from the file starting at offset START.  Read into
 243 // the buffer at P.
 244
 245 void
 246 File_read::do_read(off_t start, section_size_type size, void* p) const
 247 {
 248   ssize_t bytes;
 249   if (this->contents_ != NULL)
 250     {
 251       bytes = this->size_ - start;
 252       if (static_cast<section_size_type>(bytes) >= size)
 253         {
 254           memcpy(p, this->contents_ + start, size);
 255           return;
 256         }
 257     }
 258   else
 259     {
 260       bytes = ::pread(this->descriptor_, p, size, start);
 261       if (static_cast<section_size_type>(bytes) == size)
 262         return;
 263
 264       if (bytes < 0)
 265         {
 266           gold_fatal(_("%s: pread failed: %s"),
 267                      this->filename().c_str(), strerror(errno));
 268           return;
 269         }
 270     }
 271
 272   gold_fatal(_("%s: file too short: read only %lld of %lld bytes at %lld"),
 273              this->filename().c_str(),
 274              static_cast<long long>(bytes),
 275              static_cast<long long>(size),
 276              static_cast<long long>(start));
 277 }
 278
 279 // Read data from the file.
 280
 281 void
 282 File_read::read(off_t start, section_size_type size, void* p) const
 283 {
 284   const File_read::View* pv = this->find_view(start, size, -1U, NULL);
 285   if (pv != NULL)
 286     {
 287       memcpy(p, pv->data() + (start - pv->start() + pv->byteshift()), size);
 288       return;
 289     }
 290
 291   this->do_read(start, size, p);
 292 }
 293
 294 // Add a new view.  There may already be an existing view at this
 295 // offset.  If there is, the new view will be larger, and should
 296 // replace the old view.
 297
 298 void
 299 File_read::add_view(File_read::View* v)
 300 {
 301   std::pair<Views::iterator, bool> ins =
 302     this->views_.insert(std::make_pair(std::make_pair(v->start(),
 303                                                       v->byteshift()),
 304                                        v));
 305   if (ins.second)
 306     return;
 307
 308   // There was an existing view at this offset.  It must not be large
 309   // enough.  We can't delete it here, since something might be using
 310   // it; we put it on a list to be deleted when the file is unlocked.
 311   File_read::View* vold = ins.first->second;
 312   gold_assert(vold->size() < v->size());
 313   if (vold->should_cache())
 314     {
 315       v->set_cache();
 316       vold->clear_cache();
 317     }
 318   this->saved_views_.push_back(vold);
 319
 320   ins.first->second = v;
 321 }
 322
 323 // Make a new view with a specified byteshift, reading the data from
 324 // the file.
 325
 326 File_read::View*
 327 File_read::make_view(off_t start, section_size_type size,
 328                      unsigned int byteshift, bool cache)
 329 {
 330   off_t poff = File_read::page_offset(start);
 331
 332   section_size_type psize = File_read::pages(size + (start - poff));
 333
 334   if (poff + static_cast<off_t>(psize) >= this->size_)
 335     {
 336       psize = this->size_ - poff;
 337       gold_assert(psize >= size);
 338     }
 339
 340   File_read::View* v;
 341   if (this->contents_ != NULL || byteshift != 0)
 342     {
 343       unsigned char* p = new unsigned char[psize + byteshift];
 344       memset(p, 0, byteshift);
 345       this->do_read(poff, psize, p + byteshift);
 346       v = new File_read::View(poff, psize, p, byteshift, cache, false);
 347     }
 348   else
 349     {
 350       void* p = ::mmap(NULL, psize, PROT_READ, MAP_PRIVATE,
 351                        this->descriptor_, poff);
 352       if (p == MAP_FAILED)
 353         gold_fatal(_("%s: mmap offset %lld size %lld failed: %s"),
 354                    this->filename().c_str(),
 355                    static_cast<long long>(poff),
 356                    static_cast<long long>(psize),
 357                    strerror(errno));
 358
 359       this->mapped_bytes_ += psize;
 360
 361       const unsigned char* pbytes = static_cast<const unsigned char*>(p);
 362       v = new File_read::View(poff, psize, pbytes, 0, cache, true);
 363     }
 364
 365   this->add_view(v);
 366
 367   return v;
 368 }
 369
 370 // Find a View or make a new one, shifted as required by the file
 371 // offset OFFSET and ALIGNED.
 372
 373 File_read::View*
 374 File_read::find_or_make_view(off_t offset, off_t start,
 375                              section_size_type size, bool aligned, bool cache)
 376 {
 377   unsigned int byteshift;
 378   if (offset == 0)
 379     byteshift = 0;
 380   else
 381     {
 382       unsigned int target_size = (!parameters->target_valid()
 383                                   ? 64
 384                                   : parameters->target().get_size());
 385       byteshift = offset & ((target_size / 8) - 1);
 386
 387       // Set BYTESHIFT to the number of dummy bytes which must be
 388       // inserted before the data in order for this data to be
 389       // aligned.
 390       if (byteshift != 0)
 391         byteshift = (target_size / 8) - byteshift;
 392     }
 393
 394   // Try to find a View with the required BYTESHIFT.
 395   File_read::View* vshifted;
 396   File_read::View* v = this->find_view(offset + start, size,
 397                                        aligned ? byteshift : -1U,
 398                                        &vshifted);
 399   if (v != NULL)
 400     {
 401       if (cache)
 402         v->set_cache();
 403       return v;
 404     }
 405
 406   // If VSHIFTED is not NULL, then it has the data we need, but with
 407   // the wrong byteshift.
 408   v = vshifted;
 409   if (v != NULL)
 410     {
 411       gold_assert(aligned);
 412
 413       unsigned char* pbytes = new unsigned char[v->size() + byteshift];
 414       memset(pbytes, 0, byteshift);
 415       memcpy(pbytes + byteshift, v->data() + v->byteshift(), v->size());
 416
 417       File_read::View* shifted_view = new File_read::View(v->start(), v->size(),
 418                                                           pbytes, byteshift,
 419                                                           cache, false);
 420
 421       this->add_view(shifted_view);
 422       return shifted_view;
 423     }
 424
 425   // Make a new view.  If we don't need an aligned view, use a
 426   // byteshift of 0, so that we can use mmap.
 427   return this->make_view(offset + start, size,
 428                          aligned ? byteshift : 0,
 429                          cache);
 430 }
 431
 432 // Get a view into the file.
 433
 434 const unsigned char*
 435 File_read::get_view(off_t offset, off_t start, section_size_type size,
 436                     bool aligned, bool cache)
 437 {
 438   File_read::View* pv = this->find_or_make_view(offset, start, size,
 439                                                 aligned, cache);
 440   return pv->data() + (offset + start - pv->start() + pv->byteshift());
 441 }
 442
 443 File_view*
 444 File_read::get_lasting_view(off_t offset, off_t start, section_size_type size,
 445                             bool aligned, bool cache)
 446 {
 447   File_read::View* pv = this->find_or_make_view(offset, start, size,
 448                                                 aligned, cache);
 449   pv->lock();
 450   return new File_view(*this, pv,
 451                        (pv->data()
 452                         + (offset + start - pv->start() + pv->byteshift())));
 453 }
 454
 455 // Use readv to read COUNT entries from RM starting at START.  BASE
 456 // must be added to all file offsets in RM.
 457
 458 void
 459 File_read::do_readv(off_t base, const Read_multiple& rm, size_t start,
 460                     size_t count)
 461 {
 462   unsigned char discard[File_read::page_size];
 463   iovec iov[File_read::max_readv_entries * 2];
 464   size_t iov_index = 0;
 465
 466   off_t first_offset = rm[start].file_offset;
 467   off_t last_offset = first_offset;
 468   ssize_t want = 0;
 469   for (size_t i = 0; i < count; ++i)
 470     {
 471       const Read_multiple_entry& i_entry(rm[start + i]);
 472
 473       if (i_entry.file_offset > last_offset)
 474         {
 475           size_t skip = i_entry.file_offset - last_offset;
 476           gold_assert(skip <= sizeof discard);
 477
 478           iov[iov_index].iov_base = discard;
 479           iov[iov_index].iov_len = skip;
 480           ++iov_index;
 481
 482           want += skip;
 483         }
 484
 485       iov[iov_index].iov_base = i_entry.buffer;
 486       iov[iov_index].iov_len = i_entry.size;
 487       ++iov_index;
 488
 489       want += i_entry.size;
 490
 491       last_offset = i_entry.file_offset + i_entry.size;
 492     }
 493
 494   gold_assert(iov_index < sizeof iov / sizeof iov[0]);
 495
 496   if (::lseek(this->descriptor_, base + first_offset, SEEK_SET) < 0)
 497     gold_fatal(_("%s: lseek failed: %s"),
 498                this->filename().c_str(), strerror(errno));
 499
 500   ssize_t got = ::readv(this->descriptor_, iov, iov_index);
 501
 502   if (got < 0)
 503     gold_fatal(_("%s: readv failed: %s"),
 504                this->filename().c_str(), strerror(errno));
 505   if (got != want)
 506     gold_fatal(_("%s: file too short: read only %zd of %zd bytes at %lld"),
 507                this->filename().c_str(),
 508                got, want, static_cast<long long>(base + first_offset));
 509 }
 510
 511 // Read several pieces of data from the file.
 512
 513 void
 514 File_read::read_multiple(off_t base, const Read_multiple& rm)
 515 {
 516   size_t count = rm.size();
 517   size_t i = 0;
 518   while (i < count)
 519     {
 520       // Find up to MAX_READV_ENTRIES consecutive entries which are
 521       // less than one page apart.
 522       const Read_multiple_entry& i_entry(rm[i]);
 523       off_t i_off = i_entry.file_offset;
 524       off_t end_off = i_off + i_entry.size;
 525       size_t j;
 526       for (j = i + 1; j < count; ++j)
 527         {
 528           if (j - i >= File_read::max_readv_entries)
 529             break;
 530           const Read_multiple_entry& j_entry(rm[j]);
 531           off_t j_off = j_entry.file_offset;
 532           gold_assert(j_off >= end_off);
 533           off_t j_end_off = j_off + j_entry.size;
 534           if (j_end_off - end_off >= File_read::page_size)
 535             break;
 536           end_off = j_end_off;
 537         }
 538
 539       if (j == i + 1)
 540         this->read(base + i_off, i_entry.size, i_entry.buffer);
 541       else
 542         {
 543           File_read::View* view = this->find_view(base + i_off,
 544                                                   end_off - i_off,
 545                                                   -1U, NULL);
 546           if (view == NULL)
 547             this->do_readv(base, rm, i, j - i);
 548           else
 549             {
 550               const unsigned char* v = (view->data()
 551                                         + (base + i_off - view->start()
 552                                            + view->byteshift()));
 553               for (size_t k = i; k < j; ++k)
 554                 {
 555                   const Read_multiple_entry& k_entry(rm[k]);
 556                   gold_assert((convert_to_section_size_type(k_entry.file_offset
 557                                                            - i_off)
 558                                + k_entry.size)
 559                               <= convert_to_section_size_type(end_off
 560                                                               - i_off));
 561                   memcpy(k_entry.buffer,
 562                          v + (k_entry.file_offset - i_off),
 563                          k_entry.size);
 564                 }
 565             }
 566         }
 567
 568       i = j;
 569     }
 570 }
 571
 572 // Mark all views as no longer cached.
 573
 574 void
 575 File_read::clear_view_cache_marks()
 576 {
 577   // Just ignore this if there are multiple objects associated with
 578   // the file.  Otherwise we will wind up uncaching and freeing some
 579   // views for other objects.
 580   if (this->object_count_ > 1)
 581     return;
 582
 583   for (Views::iterator p = this->views_.begin();
 584        p != this->views_.end();
 585        ++p)
 586     p->second->clear_cache();
 587   for (Saved_views::iterator p = this->saved_views_.begin();
 588        p != this->saved_views_.end();
 589        ++p)
 590     (*p)->clear_cache();
 591 }
 592
 593 // Remove all the file views.  For a file which has multiple
 594 // associated objects (i.e., an archive), we keep accessed views
 595 // around until next time, in the hopes that they will be useful for
 596 // the next object.
 597
 598 void
 599 File_read::clear_views(bool destroying)
 600 {
 601   Views::iterator p = this->views_.begin();
 602   while (p != this->views_.end())
 603     {
 604       bool should_delete;
 605       if (p->second->is_locked())
 606         should_delete = false;
 607       else if (destroying)
 608         should_delete = true;
 609       else if (p->second->should_cache())
 610         should_delete = false;
 611       else if (this->object_count_ > 1 && p->second->accessed())
 612         should_delete = false;
 613       else
 614         should_delete = true;
 615
 616       if (should_delete)
 617         {
 618           delete p->second;
 619
 620           // map::erase invalidates only the iterator to the deleted
 621           // element.
 622           Views::iterator pe = p;
 623           ++p;
 624           this->views_.erase(pe);
 625         }
 626       else
 627         {
 628           gold_assert(!destroying);
 629           p->second->clear_accessed();
 630           ++p;
 631         }
 632     }
 633
 634   Saved_views::iterator q = this->saved_views_.begin();
 635   while (q != this->saved_views_.end())
 636     {
 637       if (!(*q)->is_locked())
 638         {
 639           delete *q;
 640           q = this->saved_views_.erase(q);
 641         }
 642       else
 643         {
 644           gold_assert(!destroying);
 645           ++q;
 646         }
 647     }
 648 }
 649
 650 // Print statistical information to stderr.  This is used for --stats.
 651
 652 void
 653 File_read::print_stats()
 654 {
 655   fprintf(stderr, _("%s: total bytes mapped for read: %llu\n"),
 656           program_name, File_read::total_mapped_bytes);
 657   fprintf(stderr, _("%s: maximum bytes mapped for read at one time: %llu\n"),
 658           program_name, File_read::maximum_mapped_bytes);
 659 }
 660
 661 // Class File_view.
 662
 663 File_view::~File_view()
 664 {
 665   gold_assert(this->file_.is_locked());
 666   this->view_->unlock();
 667 }
 668
 669 // Class Input_file.
 670
 671 // Create a file for testing.
 672
 673 Input_file::Input_file(const Task* task, const char* name,
 674                        const unsigned char* contents, off_t size)
 675   : file_()
 676 {
 677   this->input_argument_ =
 678     new Input_file_argument(name, false, "", false,
 679                             Position_dependent_options());
 680   bool ok = file_.open(task, name, contents, size);
 681   gold_assert(ok);
 682 }
 683
 684 // Return the position dependent options in force for this file.
 685
 686 const Position_dependent_options&
 687 Input_file::options() const
 688 {
 689   return this->input_argument_->options();
 690 }
 691
 692 // Return the name given by the user.  For -lc this will return "c".
 693
 694 const char*
 695 Input_file::name() const
 696 {
 697   return this->input_argument_->name();
 698 }
 699
 700 // Return whether we are only reading symbols.
 701
 702 bool
 703 Input_file::just_symbols() const
 704 {
 705   return this->input_argument_->just_symbols();
 706 }
 707
 708 // Open the file.
 709
 710 // If the filename is not absolute, we assume it is in the current
 711 // directory *except* when:
 712 //    A) input_argument_->is_lib() is true; or
 713 //    B) input_argument_->extra_search_path() is not empty.
 714 // In both cases, we look in extra_search_path + library_path to find
 715 // the file location, rather than the current directory.
 716
 717 bool
 718 Input_file::open(const General_options& options, const Dirsearch& dirpath,
 719                  const Task* task)
 720 {
 721   std::string name;
 722
 723   // Case 1: name is an absolute file, just try to open it
 724   // Case 2: name is relative but is_lib is false and extra_search_path
 725   //         is empty
 726   if (IS_ABSOLUTE_PATH (this->input_argument_->name())
 727       || (!this->input_argument_->is_lib()
 728           && this->input_argument_->extra_search_path() == NULL))
 729     {
 730       name = this->input_argument_->name();
 731       this->found_name_ = name;
 732     }
 733   // Case 3: is_lib is true
 734   else if (this->input_argument_->is_lib())
 735     {
 736       // We don't yet support extra_search_path with -l.
 737       gold_assert(this->input_argument_->extra_search_path() == NULL);
 738       std::string n1("lib");
 739       n1 += this->input_argument_->name();
 740       std::string n2;
 741       if (options.is_static()
 742           || !this->input_argument_->options().Bdynamic())
 743         n1 += ".a";
 744       else
 745         {
 746           n2 = n1 + ".a";
 747           n1 += ".so";
 748         }
 749       name = dirpath.find(n1, n2, &this->is_in_sysroot_);
 750       if (name.empty())
 751         {
 752           gold_error(_("cannot find -l%s"),
 753                      this->input_argument_->name());
 754           return false;
 755         }
 756       if (n2.empty() || name[name.length() - 1] == 'o')
 757         this->found_name_ = n1;
 758       else
 759         this->found_name_ = n2;
 760     }
 761   // Case 4: extra_search_path is not empty
 762   else
 763     {
 764       gold_assert(this->input_argument_->extra_search_path() != NULL);
 765
 766       // First, check extra_search_path.
 767       name = this->input_argument_->extra_search_path();
 768       if (!IS_DIR_SEPARATOR (name[name.length() - 1]))
 769         name += '/';
 770       name += this->input_argument_->name();
 771       struct stat dummy_stat;
 772       if (::stat(name.c_str(), &dummy_stat) < 0)
 773         {
 774           // extra_search_path failed, so check the normal search-path.
 775           name = dirpath.find(this->input_argument_->name(), "",
 776                               &this->is_in_sysroot_);
 777           if (name.empty())
 778             {
 779               gold_error(_("cannot find %s"),
 780                          this->input_argument_->name());
 781               return false;
 782             }
 783         }
 784       this->found_name_ = this->input_argument_->name();
 785     }
 786
 787   // Now that we've figured out where the file lives, try to open it.
 788
 789   General_options::Object_format format =
 790     this->input_argument_->options().format_enum();
 791   bool ok;
 792   if (format == General_options::OBJECT_FORMAT_ELF)
 793     ok = this->file_.open(task, name);
 794   else
 795     {
 796       gold_assert(format == General_options::OBJECT_FORMAT_BINARY);
 797       ok = this->open_binary(options, task, name);
 798     }
 799
 800   if (!ok)
 801     {
 802       gold_error(_("cannot open %s: %s"),
 803                  name.c_str(), strerror(errno));
 804       return false;
 805     }
 806
 807   return true;
 808 }
 809
 810 // Open a file for --format binary.
 811
 812 bool
 813 Input_file::open_binary(const General_options&,
 814                         const Task* task, const std::string& name)
 815 {
 816   // In order to open a binary file, we need machine code, size, and
 817   // endianness.  We may not have a valid target at this point, in
 818   // which case we use the default target.
 819   const Target* target;
 820   if (parameters->target_valid())
 821     target = &parameters->target();
 822   else
 823     target = &parameters->default_target();
 824
 825   Binary_to_elf binary_to_elf(target->machine_code(),
 826                               target->get_size(),
 827                               target->is_big_endian(),
 828                               name);
 829   if (!binary_to_elf.convert(task))
 830     return false;
 831   return this->file_.open(task, name, binary_to_elf.converted_data_leak(),
 832                           binary_to_elf.converted_size());
 833 }
 834
 835 } // End namespace gold.