gold/fileread.cc

   1 // fileread.cc -- read files for gold
   2
   3 // Copyright 2006, 2007, 2008, 2009 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 "descriptors.h"
  40 #include "fileread.h"
  41
  42 namespace gold
  43 {
  44
  45 // Class File_read::View.
  46
  47 File_read::View::~View()
  48 {
  49   gold_assert(!this->is_locked());
  50   if (!this->mapped_)
  51     delete[] this->data_;
  52   else
  53     {
  54       if (::munmap(const_cast<unsigned char*>(this->data_), this->size_) != 0)
  55         gold_warning(_("munmap failed: %s"), strerror(errno));
  56
  57       File_read::current_mapped_bytes -= this->size_;
  58     }
  59 }
  60
  61 void
  62 File_read::View::lock()
  63 {
  64   ++this->lock_count_;
  65 }
  66
  67 void
  68 File_read::View::unlock()
  69 {
  70   gold_assert(this->lock_count_ > 0);
  71   --this->lock_count_;
  72 }
  73
  74 bool
  75 File_read::View::is_locked()
  76 {
  77   return this->lock_count_ > 0;
  78 }
  79
  80 // Class File_read.
  81
  82 // The File_read static variables.
  83 unsigned long long File_read::total_mapped_bytes;
  84 unsigned long long File_read::current_mapped_bytes;
  85 unsigned long long File_read::maximum_mapped_bytes;
  86
  87 File_read::~File_read()
  88 {
  89   gold_assert(this->token_.is_writable());
  90   if (this->is_descriptor_opened_)
  91     {
  92       release_descriptor(this->descriptor_, true);
  93       this->descriptor_ = -1;
  94       this->is_descriptor_opened_ = false;
  95     }
  96   this->name_.clear();
  97   this->clear_views(true);
  98 }
  99
 100 // Open the file.
 101
 102 bool
 103 File_read::open(const Task* task, const std::string& name)
 104 {
 105   gold_assert(this->token_.is_writable()
 106               && this->descriptor_ < 0
 107               && !this->is_descriptor_opened_
 108               && this->name_.empty());
 109   this->name_ = name;
 110
 111   this->descriptor_ = open_descriptor(-1, this->name_.c_str(),
 112                                       O_RDONLY);
 113
 114   if (this->descriptor_ >= 0)
 115     {
 116       this->is_descriptor_opened_ = true;
 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       this->token_.add_writer(task);
 126     }
 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->is_descriptor_opened_
 140               && this->name_.empty());
 141   this->name_ = name;
 142   this->contents_ = contents;
 143   this->size_ = size;
 144   this->token_.add_writer(task);
 145   return true;
 146 }
 147
 148 // Reopen a descriptor if necessary.
 149
 150 void
 151 File_read::reopen_descriptor()
 152 {
 153   if (!this->is_descriptor_opened_)
 154     {
 155       this->descriptor_ = open_descriptor(this->descriptor_,
 156                                           this->name_.c_str(),
 157                                           O_RDONLY);
 158       if (this->descriptor_ < 0)
 159         gold_fatal(_("could not reopen file %s"), this->name_.c_str());
 160       this->is_descriptor_opened_ = true;
 161     }
 162 }
 163
 164 // Release the file.  This is called when we are done with the file in
 165 // a Task.
 166
 167 void
 168 File_read::release()
 169 {
 170   gold_assert(this->is_locked());
 171
 172   File_read::total_mapped_bytes += this->mapped_bytes_;
 173   File_read::current_mapped_bytes += this->mapped_bytes_;
 174   this->mapped_bytes_ = 0;
 175   if (File_read::current_mapped_bytes > File_read::maximum_mapped_bytes)
 176     File_read::maximum_mapped_bytes = File_read::current_mapped_bytes;
 177
 178   // Only clear views if there is only one attached object.  Otherwise
 179   // we waste time trying to clear cached archive views.  Similarly
 180   // for releasing the descriptor.
 181   if (this->object_count_ <= 1)
 182     {
 183       this->clear_views(false);
 184       if (this->is_descriptor_opened_)
 185         {
 186           release_descriptor(this->descriptor_, false);
 187           this->is_descriptor_opened_ = false;
 188         }
 189     }
 190
 191   this->released_ = true;
 192 }
 193
 194 // Lock the file.
 195
 196 void
 197 File_read::lock(const Task* task)
 198 {
 199   gold_assert(this->released_);
 200   this->token_.add_writer(task);
 201   this->released_ = false;
 202 }
 203
 204 // Unlock the file.
 205
 206 void
 207 File_read::unlock(const Task* task)
 208 {
 209   this->release();
 210   this->token_.remove_writer(task);
 211 }
 212
 213 // Return whether the file is locked.
 214
 215 bool
 216 File_read::is_locked() const
 217 {
 218   if (!this->token_.is_writable())
 219     return true;
 220   // The file is not locked, so it should have been released.
 221   gold_assert(this->released_);
 222   return false;
 223 }
 224
 225 // See if we have a view which covers the file starting at START for
 226 // SIZE bytes.  Return a pointer to the View if found, NULL if not.
 227 // If BYTESHIFT is not -1U, the returned View must have the specified
 228 // byte shift; otherwise, it may have any byte shift.  If VSHIFTED is
 229 // not NULL, this sets *VSHIFTED to a view which would have worked if
 230 // not for the requested BYTESHIFT.
 231
 232 inline File_read::View*
 233 File_read::find_view(off_t start, section_size_type size,
 234                      unsigned int byteshift, File_read::View** vshifted) const
 235 {
 236   if (vshifted != NULL)
 237     *vshifted = NULL;
 238
 239   off_t page = File_read::page_offset(start);
 240
 241   unsigned int bszero = 0;
 242   Views::const_iterator p = this->views_.upper_bound(std::make_pair(page - 1,
 243                                                                     bszero));
 244
 245   while (p != this->views_.end() && p->first.first <= page)
 246     {
 247       if (p->second->start() <= start
 248           && (p->second->start() + static_cast<off_t>(p->second->size())
 249               >= start + static_cast<off_t>(size)))
 250         {
 251           if (byteshift == -1U || byteshift == p->second->byteshift())
 252             {
 253               p->second->set_accessed();
 254               return p->second;
 255             }
 256
 257           if (vshifted != NULL && *vshifted == NULL)
 258             *vshifted = p->second;
 259         }
 260
 261       ++p;
 262     }
 263
 264   return NULL;
 265 }
 266
 267 // Read SIZE bytes from the file starting at offset START.  Read into
 268 // the buffer at P.
 269
 270 void
 271 File_read::do_read(off_t start, section_size_type size, void* p)
 272 {
 273   ssize_t bytes;
 274   if (this->contents_ != NULL)
 275     {
 276       bytes = this->size_ - start;
 277       if (static_cast<section_size_type>(bytes) >= size)
 278         {
 279           memcpy(p, this->contents_ + start, size);
 280           return;
 281         }
 282     }
 283   else
 284     {
 285       this->reopen_descriptor();
 286       bytes = ::pread(this->descriptor_, p, size, start);
 287       if (static_cast<section_size_type>(bytes) == size)
 288         return;
 289
 290       if (bytes < 0)
 291         {
 292           gold_fatal(_("%s: pread failed: %s"),
 293                      this->filename().c_str(), strerror(errno));
 294           return;
 295         }
 296     }
 297
 298   gold_fatal(_("%s: file too short: read only %lld of %lld bytes at %lld"),
 299              this->filename().c_str(),
 300              static_cast<long long>(bytes),
 301              static_cast<long long>(size),
 302              static_cast<long long>(start));
 303 }
 304
 305 // Read data from the file.
 306
 307 void
 308 File_read::read(off_t start, section_size_type size, void* p)
 309 {
 310   const File_read::View* pv = this->find_view(start, size, -1U, NULL);
 311   if (pv != NULL)
 312     {
 313       memcpy(p, pv->data() + (start - pv->start() + pv->byteshift()), size);
 314       return;
 315     }
 316
 317   this->do_read(start, size, p);
 318 }
 319
 320 // Add a new view.  There may already be an existing view at this
 321 // offset.  If there is, the new view will be larger, and should
 322 // replace the old view.
 323
 324 void
 325 File_read::add_view(File_read::View* v)
 326 {
 327   std::pair<Views::iterator, bool> ins =
 328     this->views_.insert(std::make_pair(std::make_pair(v->start(),
 329                                                       v->byteshift()),
 330                                        v));
 331   if (ins.second)
 332     return;
 333
 334   // There was an existing view at this offset.  It must not be large
 335   // enough.  We can't delete it here, since something might be using
 336   // it; we put it on a list to be deleted when the file is unlocked.
 337   File_read::View* vold = ins.first->second;
 338   gold_assert(vold->size() < v->size());
 339   if (vold->should_cache())
 340     {
 341       v->set_cache();
 342       vold->clear_cache();
 343     }
 344   this->saved_views_.push_back(vold);
 345
 346   ins.first->second = v;
 347 }
 348
 349 // Make a new view with a specified byteshift, reading the data from
 350 // the file.
 351
 352 File_read::View*
 353 File_read::make_view(off_t start, section_size_type size,
 354                      unsigned int byteshift, bool cache)
 355 {
 356   gold_assert(size > 0);
 357
 358   // Check that start and end of the view are within the file.
 359   if (start > this->size_
 360       || (static_cast<unsigned long long>(size)
 361           > static_cast<unsigned long long>(this->size_ - start)))
 362     gold_fatal(_("%s: attempt to map %lld bytes at offset %lld exceeds "
 363                  "size of file; the file may be corrupt"),
 364                    this->filename().c_str(),
 365                    static_cast<long long>(size),
 366                    static_cast<long long>(start));
 367
 368   off_t poff = File_read::page_offset(start);
 369
 370   section_size_type psize = File_read::pages(size + (start - poff));
 371
 372   if (poff + static_cast<off_t>(psize) >= this->size_)
 373     {
 374       psize = this->size_ - poff;
 375       gold_assert(psize >= size);
 376     }
 377
 378   File_read::View* v;
 379   if (this->contents_ != NULL || byteshift != 0)
 380     {
 381       unsigned char* p = new unsigned char[psize + byteshift];
 382       memset(p, 0, byteshift);
 383       this->do_read(poff, psize, p + byteshift);
 384       v = new File_read::View(poff, psize, p, byteshift, cache, false);
 385     }
 386   else
 387     {
 388       this->reopen_descriptor();
 389       void* p = ::mmap(NULL, psize, PROT_READ, MAP_PRIVATE,
 390                        this->descriptor_, poff);
 391       if (p == MAP_FAILED)
 392         gold_fatal(_("%s: mmap offset %lld size %lld failed: %s"),
 393                    this->filename().c_str(),
 394                    static_cast<long long>(poff),
 395                    static_cast<long long>(psize),
 396                    strerror(errno));
 397
 398       this->mapped_bytes_ += psize;
 399
 400       const unsigned char* pbytes = static_cast<const unsigned char*>(p);
 401       v = new File_read::View(poff, psize, pbytes, 0, cache, true);
 402     }
 403
 404   this->add_view(v);
 405
 406   return v;
 407 }
 408
 409 // Find a View or make a new one, shifted as required by the file
 410 // offset OFFSET and ALIGNED.
 411
 412 File_read::View*
 413 File_read::find_or_make_view(off_t offset, off_t start,
 414                              section_size_type size, bool aligned, bool cache)
 415 {
 416   unsigned int byteshift;
 417   if (offset == 0)
 418     byteshift = 0;
 419   else
 420     {
 421       unsigned int target_size = (!parameters->target_valid()
 422                                   ? 64
 423                                   : parameters->target().get_size());
 424       byteshift = offset & ((target_size / 8) - 1);
 425
 426       // Set BYTESHIFT to the number of dummy bytes which must be
 427       // inserted before the data in order for this data to be
 428       // aligned.
 429       if (byteshift != 0)
 430         byteshift = (target_size / 8) - byteshift;
 431     }
 432
 433   // Try to find a View with the required BYTESHIFT.
 434   File_read::View* vshifted;
 435   File_read::View* v = this->find_view(offset + start, size,
 436                                        aligned ? byteshift : -1U,
 437                                        &vshifted);
 438   if (v != NULL)
 439     {
 440       if (cache)
 441         v->set_cache();
 442       return v;
 443     }
 444
 445   // If VSHIFTED is not NULL, then it has the data we need, but with
 446   // the wrong byteshift.
 447   v = vshifted;
 448   if (v != NULL)
 449     {
 450       gold_assert(aligned);
 451
 452       unsigned char* pbytes = new unsigned char[v->size() + byteshift];
 453       memset(pbytes, 0, byteshift);
 454       memcpy(pbytes + byteshift, v->data() + v->byteshift(), v->size());
 455
 456       File_read::View* shifted_view = new File_read::View(v->start(), v->size(),
 457                                                           pbytes, byteshift,
 458                                                           cache, false);
 459
 460       this->add_view(shifted_view);
 461       return shifted_view;
 462     }
 463
 464   // Make a new view.  If we don't need an aligned view, use a
 465   // byteshift of 0, so that we can use mmap.
 466   return this->make_view(offset + start, size,
 467                          aligned ? byteshift : 0,
 468                          cache);
 469 }
 470
 471 // Get a view into the file.
 472
 473 const unsigned char*
 474 File_read::get_view(off_t offset, off_t start, section_size_type size,
 475                     bool aligned, bool cache)
 476 {
 477   File_read::View* pv = this->find_or_make_view(offset, start, size,
 478                                                 aligned, cache);
 479   return pv->data() + (offset + start - pv->start() + pv->byteshift());
 480 }
 481
 482 File_view*
 483 File_read::get_lasting_view(off_t offset, off_t start, section_size_type size,
 484                             bool aligned, bool cache)
 485 {
 486   File_read::View* pv = this->find_or_make_view(offset, start, size,
 487                                                 aligned, cache);
 488   pv->lock();
 489   return new File_view(*this, pv,
 490                        (pv->data()
 491                         + (offset + start - pv->start() + pv->byteshift())));
 492 }
 493
 494 // Use readv to read COUNT entries from RM starting at START.  BASE
 495 // must be added to all file offsets in RM.
 496
 497 void
 498 File_read::do_readv(off_t base, const Read_multiple& rm, size_t start,
 499                     size_t count)
 500 {
 501   unsigned char discard[File_read::page_size];
 502   iovec iov[File_read::max_readv_entries * 2];
 503   size_t iov_index = 0;
 504
 505   off_t first_offset = rm[start].file_offset;
 506   off_t last_offset = first_offset;
 507   ssize_t want = 0;
 508   for (size_t i = 0; i < count; ++i)
 509     {
 510       const Read_multiple_entry& i_entry(rm[start + i]);
 511
 512       if (i_entry.file_offset > last_offset)
 513         {
 514           size_t skip = i_entry.file_offset - last_offset;
 515           gold_assert(skip <= sizeof discard);
 516
 517           iov[iov_index].iov_base = discard;
 518           iov[iov_index].iov_len = skip;
 519           ++iov_index;
 520
 521           want += skip;
 522         }
 523
 524       iov[iov_index].iov_base = i_entry.buffer;
 525       iov[iov_index].iov_len = i_entry.size;
 526       ++iov_index;
 527
 528       want += i_entry.size;
 529
 530       last_offset = i_entry.file_offset + i_entry.size;
 531     }
 532
 533   this->reopen_descriptor();
 534
 535   gold_assert(iov_index < sizeof iov / sizeof iov[0]);
 536
 537   if (::lseek(this->descriptor_, base + first_offset, SEEK_SET) < 0)
 538     gold_fatal(_("%s: lseek failed: %s"),
 539                this->filename().c_str(), strerror(errno));
 540
 541   ssize_t got = ::readv(this->descriptor_, iov, iov_index);
 542
 543   if (got < 0)
 544     gold_fatal(_("%s: readv failed: %s"),
 545                this->filename().c_str(), strerror(errno));
 546   if (got != want)
 547     gold_fatal(_("%s: file too short: read only %zd of %zd bytes at %lld"),
 548                this->filename().c_str(),
 549                got, want, static_cast<long long>(base + first_offset));
 550 }
 551
 552 // Read several pieces of data from the file.
 553
 554 void
 555 File_read::read_multiple(off_t base, const Read_multiple& rm)
 556 {
 557   size_t count = rm.size();
 558   size_t i = 0;
 559   while (i < count)
 560     {
 561       // Find up to MAX_READV_ENTRIES consecutive entries which are
 562       // less than one page apart.
 563       const Read_multiple_entry& i_entry(rm[i]);
 564       off_t i_off = i_entry.file_offset;
 565       off_t end_off = i_off + i_entry.size;
 566       size_t j;
 567       for (j = i + 1; j < count; ++j)
 568         {
 569           if (j - i >= File_read::max_readv_entries)
 570             break;
 571           const Read_multiple_entry& j_entry(rm[j]);
 572           off_t j_off = j_entry.file_offset;
 573           gold_assert(j_off >= end_off);
 574           off_t j_end_off = j_off + j_entry.size;
 575           if (j_end_off - end_off >= File_read::page_size)
 576             break;
 577           end_off = j_end_off;
 578         }
 579
 580       if (j == i + 1)
 581         this->read(base + i_off, i_entry.size, i_entry.buffer);
 582       else
 583         {
 584           File_read::View* view = this->find_view(base + i_off,
 585                                                   end_off - i_off,
 586                                                   -1U, NULL);
 587           if (view == NULL)
 588             this->do_readv(base, rm, i, j - i);
 589           else
 590             {
 591               const unsigned char* v = (view->data()
 592                                         + (base + i_off - view->start()
 593                                            + view->byteshift()));
 594               for (size_t k = i; k < j; ++k)
 595                 {
 596                   const Read_multiple_entry& k_entry(rm[k]);
 597                   gold_assert((convert_to_section_size_type(k_entry.file_offset
 598                                                            - i_off)
 599                                + k_entry.size)
 600                               <= convert_to_section_size_type(end_off
 601                                                               - i_off));
 602                   memcpy(k_entry.buffer,
 603                          v + (k_entry.file_offset - i_off),
 604                          k_entry.size);
 605                 }
 606             }
 607         }
 608
 609       i = j;
 610     }
 611 }
 612
 613 // Mark all views as no longer cached.
 614
 615 void
 616 File_read::clear_view_cache_marks()
 617 {
 618   // Just ignore this if there are multiple objects associated with
 619   // the file.  Otherwise we will wind up uncaching and freeing some
 620   // views for other objects.
 621   if (this->object_count_ > 1)
 622     return;
 623
 624   for (Views::iterator p = this->views_.begin();
 625        p != this->views_.end();
 626        ++p)
 627     p->second->clear_cache();
 628   for (Saved_views::iterator p = this->saved_views_.begin();
 629        p != this->saved_views_.end();
 630        ++p)
 631     (*p)->clear_cache();
 632 }
 633
 634 // Remove all the file views.  For a file which has multiple
 635 // associated objects (i.e., an archive), we keep accessed views
 636 // around until next time, in the hopes that they will be useful for
 637 // the next object.
 638
 639 void
 640 File_read::clear_views(bool destroying)
 641 {
 642   Views::iterator p = this->views_.begin();
 643   while (p != this->views_.end())
 644     {
 645       bool should_delete;
 646       if (p->second->is_locked())
 647         should_delete = false;
 648       else if (destroying)
 649         should_delete = true;
 650       else if (p->second->should_cache())
 651         should_delete = false;
 652       else if (this->object_count_ > 1 && p->second->accessed())
 653         should_delete = false;
 654       else
 655         should_delete = true;
 656
 657       if (should_delete)
 658         {
 659           delete p->second;
 660
 661           // map::erase invalidates only the iterator to the deleted
 662           // element.
 663           Views::iterator pe = p;
 664           ++p;
 665           this->views_.erase(pe);
 666         }
 667       else
 668         {
 669           gold_assert(!destroying);
 670           p->second->clear_accessed();
 671           ++p;
 672         }
 673     }
 674
 675   Saved_views::iterator q = this->saved_views_.begin();
 676   while (q != this->saved_views_.end())
 677     {
 678       if (!(*q)->is_locked())
 679         {
 680           delete *q;
 681           q = this->saved_views_.erase(q);
 682         }
 683       else
 684         {
 685           gold_assert(!destroying);
 686           ++q;
 687         }
 688     }
 689 }
 690
 691 // Print statistical information to stderr.  This is used for --stats.
 692
 693 void
 694 File_read::print_stats()
 695 {
 696   fprintf(stderr, _("%s: total bytes mapped for read: %llu\n"),
 697           program_name, File_read::total_mapped_bytes);
 698   fprintf(stderr, _("%s: maximum bytes mapped for read at one time: %llu\n"),
 699           program_name, File_read::maximum_mapped_bytes);
 700 }
 701
 702 // Class File_view.
 703
 704 File_view::~File_view()
 705 {
 706   gold_assert(this->file_.is_locked());
 707   this->view_->unlock();
 708 }
 709
 710 // Class Input_file.
 711
 712 // Create a file for testing.
 713
 714 Input_file::Input_file(const Task* task, const char* name,
 715                        const unsigned char* contents, off_t size)
 716   : file_()
 717 {
 718   this->input_argument_ =
 719     new Input_file_argument(name, false, "", false,
 720                             Position_dependent_options());
 721   bool ok = this->file_.open(task, name, contents, size);
 722   gold_assert(ok);
 723 }
 724
 725 // Return the position dependent options in force for this file.
 726
 727 const Position_dependent_options&
 728 Input_file::options() const
 729 {
 730   return this->input_argument_->options();
 731 }
 732
 733 // Return the name given by the user.  For -lc this will return "c".
 734
 735 const char*
 736 Input_file::name() const
 737 {
 738   return this->input_argument_->name();
 739 }
 740
 741 // Return whether this file is in a system directory.
 742
 743 bool
 744 Input_file::is_in_system_directory() const
 745 {
 746   if (this->is_in_sysroot())
 747     return true;
 748   return parameters->options().is_in_system_directory(this->filename());
 749 }
 750
 751 // Return whether we are only reading symbols.
 752
 753 bool
 754 Input_file::just_symbols() const
 755 {
 756   return this->input_argument_->just_symbols();
 757 }
 758
 759 // Return whether this is a file that we will search for in the list
 760 // of directories.
 761
 762 bool
 763 Input_file::will_search_for() const
 764 {
 765   return (!IS_ABSOLUTE_PATH(this->input_argument_->name())
 766           && (this->input_argument_->is_lib()
 767               || this->input_argument_->extra_search_path() != NULL));
 768 }
 769
 770 // Open the file.
 771
 772 // If the filename is not absolute, we assume it is in the current
 773 // directory *except* when:
 774 //    A) input_argument_->is_lib() is true; or
 775 //    B) input_argument_->extra_search_path() is not empty.
 776 // In both cases, we look in extra_search_path + library_path to find
 777 // the file location, rather than the current directory.
 778
 779 bool
 780 Input_file::open(const Dirsearch& dirpath, const Task* task, int *pindex)
 781 {
 782   std::string name;
 783
 784   // Case 1: name is an absolute file, just try to open it
 785   // Case 2: name is relative but is_lib is false and extra_search_path
 786   //         is empty
 787   if (IS_ABSOLUTE_PATH(this->input_argument_->name())
 788       || (!this->input_argument_->is_lib()
 789           && this->input_argument_->extra_search_path() == NULL))
 790     {
 791       name = this->input_argument_->name();
 792       this->found_name_ = name;
 793     }
 794   // Case 3: is_lib is true
 795   else if (this->input_argument_->is_lib())
 796     {
 797       // We don't yet support extra_search_path with -l.
 798       gold_assert(this->input_argument_->extra_search_path() == NULL);
 799       std::string n1("lib");
 800       n1 += this->input_argument_->name();
 801       std::string n2;
 802       if (parameters->options().is_static()
 803           || !this->input_argument_->options().Bdynamic())
 804         n1 += ".a";
 805       else
 806         {
 807           n2 = n1 + ".a";
 808           n1 += ".so";
 809         }
 810       name = dirpath.find(n1, n2, &this->is_in_sysroot_, pindex);
 811       if (name.empty())
 812         {
 813           gold_error(_("cannot find -l%s"),
 814                      this->input_argument_->name());
 815           return false;
 816         }
 817       if (n2.empty() || name[name.length() - 1] == 'o')
 818         this->found_name_ = n1;
 819       else
 820         this->found_name_ = n2;
 821     }
 822   // Case 4: extra_search_path is not empty
 823   else
 824     {
 825       gold_assert(this->input_argument_->extra_search_path() != NULL);
 826
 827       // First, check extra_search_path.
 828       name = this->input_argument_->extra_search_path();
 829       if (!IS_DIR_SEPARATOR (name[name.length() - 1]))
 830         name += '/';
 831       name += this->input_argument_->name();
 832       struct stat dummy_stat;
 833       if (*pindex > 0 || ::stat(name.c_str(), &dummy_stat) < 0)
 834         {
 835           // extra_search_path failed, so check the normal search-path.
 836           int index = *pindex;
 837           if (index > 0)
 838             --index;
 839           name = dirpath.find(this->input_argument_->name(), "",
 840                               &this->is_in_sysroot_, &index);
 841           if (name.empty())
 842             {
 843               gold_error(_("cannot find %s"),
 844                          this->input_argument_->name());
 845               return false;
 846             }
 847           *pindex = index + 1;
 848         }
 849       this->found_name_ = this->input_argument_->name();
 850     }
 851
 852   // Now that we've figured out where the file lives, try to open it.
 853
 854   General_options::Object_format format =
 855     this->input_argument_->options().format_enum();
 856   bool ok;
 857   if (format == General_options::OBJECT_FORMAT_ELF)
 858     ok = this->file_.open(task, name);
 859   else
 860     {
 861       gold_assert(format == General_options::OBJECT_FORMAT_BINARY);
 862       ok = this->open_binary(task, name);
 863     }
 864
 865   if (!ok)
 866     {
 867       gold_error(_("cannot open %s: %s"),
 868                  name.c_str(), strerror(errno));
 869       return false;
 870     }
 871
 872   return true;
 873 }
 874
 875 // Open a file for --format binary.
 876
 877 bool
 878 Input_file::open_binary(const Task* task, const std::string& name)
 879 {
 880   // In order to open a binary file, we need machine code, size, and
 881   // endianness.  We may not have a valid target at this point, in
 882   // which case we use the default target.
 883   const Target* target;
 884   if (parameters->target_valid())
 885     target = &parameters->target();
 886   else
 887     target = &parameters->default_target();
 888
 889   Binary_to_elf binary_to_elf(target->machine_code(),
 890                               target->get_size(),
 891                               target->is_big_endian(),
 892                               name);
 893   if (!binary_to_elf.convert(task))
 894     return false;
 895   return this->file_.open(task, name, binary_to_elf.converted_data_leak(),
 896                           binary_to_elf.converted_size());
 897 }
 898
 899 } // End namespace gold.