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 "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_ || size > this->size_ - start)
 360     gold_fatal(_("%s: attempt to map %lld bytes at offset %lld exceeds "
 361                  "size of file; the file may be corrupt"),
 362                    this->filename().c_str(),
 363                    static_cast<long long>(size),
 364                    static_cast<long long>(start));
 365
 366   off_t poff = File_read::page_offset(start);
 367
 368   section_size_type psize = File_read::pages(size + (start - poff));
 369
 370   if (poff + static_cast<off_t>(psize) >= this->size_)
 371     {
 372       psize = this->size_ - poff;
 373       gold_assert(psize >= size);
 374     }
 375
 376   File_read::View* v;
 377   if (this->contents_ != NULL || byteshift != 0)
 378     {
 379       unsigned char* p = new unsigned char[psize + byteshift];
 380       memset(p, 0, byteshift);
 381       this->do_read(poff, psize, p + byteshift);
 382       v = new File_read::View(poff, psize, p, byteshift, cache, false);
 383     }
 384   else
 385     {
 386       this->reopen_descriptor();
 387       void* p = ::mmap(NULL, psize, PROT_READ, MAP_PRIVATE,
 388                        this->descriptor_, poff);
 389       if (p == MAP_FAILED)
 390         gold_fatal(_("%s: mmap offset %lld size %lld failed: %s"),
 391                    this->filename().c_str(),
 392                    static_cast<long long>(poff),
 393                    static_cast<long long>(psize),
 394                    strerror(errno));
 395
 396       this->mapped_bytes_ += psize;
 397
 398       const unsigned char* pbytes = static_cast<const unsigned char*>(p);
 399       v = new File_read::View(poff, psize, pbytes, 0, cache, true);
 400     }
 401
 402   this->add_view(v);
 403
 404   return v;
 405 }
 406
 407 // Find a View or make a new one, shifted as required by the file
 408 // offset OFFSET and ALIGNED.
 409
 410 File_read::View*
 411 File_read::find_or_make_view(off_t offset, off_t start,
 412                              section_size_type size, bool aligned, bool cache)
 413 {
 414   unsigned int byteshift;
 415   if (offset == 0)
 416     byteshift = 0;
 417   else
 418     {
 419       unsigned int target_size = (!parameters->target_valid()
 420                                   ? 64
 421                                   : parameters->target().get_size());
 422       byteshift = offset & ((target_size / 8) - 1);
 423
 424       // Set BYTESHIFT to the number of dummy bytes which must be
 425       // inserted before the data in order for this data to be
 426       // aligned.
 427       if (byteshift != 0)
 428         byteshift = (target_size / 8) - byteshift;
 429     }
 430
 431   // Try to find a View with the required BYTESHIFT.
 432   File_read::View* vshifted;
 433   File_read::View* v = this->find_view(offset + start, size,
 434                                        aligned ? byteshift : -1U,
 435                                        &vshifted);
 436   if (v != NULL)
 437     {
 438       if (cache)
 439         v->set_cache();
 440       return v;
 441     }
 442
 443   // If VSHIFTED is not NULL, then it has the data we need, but with
 444   // the wrong byteshift.
 445   v = vshifted;
 446   if (v != NULL)
 447     {
 448       gold_assert(aligned);
 449
 450       unsigned char* pbytes = new unsigned char[v->size() + byteshift];
 451       memset(pbytes, 0, byteshift);
 452       memcpy(pbytes + byteshift, v->data() + v->byteshift(), v->size());
 453
 454       File_read::View* shifted_view = new File_read::View(v->start(), v->size(),
 455                                                           pbytes, byteshift,
 456                                                           cache, false);
 457
 458       this->add_view(shifted_view);
 459       return shifted_view;
 460     }
 461
 462   // Make a new view.  If we don't need an aligned view, use a
 463   // byteshift of 0, so that we can use mmap.
 464   return this->make_view(offset + start, size,
 465                          aligned ? byteshift : 0,
 466                          cache);
 467 }
 468
 469 // Get a view into the file.
 470
 471 const unsigned char*
 472 File_read::get_view(off_t offset, off_t start, section_size_type size,
 473                     bool aligned, bool cache)
 474 {
 475   File_read::View* pv = this->find_or_make_view(offset, start, size,
 476                                                 aligned, cache);
 477   return pv->data() + (offset + start - pv->start() + pv->byteshift());
 478 }
 479
 480 File_view*
 481 File_read::get_lasting_view(off_t offset, off_t start, section_size_type size,
 482                             bool aligned, bool cache)
 483 {
 484   File_read::View* pv = this->find_or_make_view(offset, start, size,
 485                                                 aligned, cache);
 486   pv->lock();
 487   return new File_view(*this, pv,
 488                        (pv->data()
 489                         + (offset + start - pv->start() + pv->byteshift())));
 490 }
 491
 492 // Use readv to read COUNT entries from RM starting at START.  BASE
 493 // must be added to all file offsets in RM.
 494
 495 void
 496 File_read::do_readv(off_t base, const Read_multiple& rm, size_t start,
 497                     size_t count)
 498 {
 499   unsigned char discard[File_read::page_size];
 500   iovec iov[File_read::max_readv_entries * 2];
 501   size_t iov_index = 0;
 502
 503   off_t first_offset = rm[start].file_offset;
 504   off_t last_offset = first_offset;
 505   ssize_t want = 0;
 506   for (size_t i = 0; i < count; ++i)
 507     {
 508       const Read_multiple_entry& i_entry(rm[start + i]);
 509
 510       if (i_entry.file_offset > last_offset)
 511         {
 512           size_t skip = i_entry.file_offset - last_offset;
 513           gold_assert(skip <= sizeof discard);
 514
 515           iov[iov_index].iov_base = discard;
 516           iov[iov_index].iov_len = skip;
 517           ++iov_index;
 518
 519           want += skip;
 520         }
 521
 522       iov[iov_index].iov_base = i_entry.buffer;
 523       iov[iov_index].iov_len = i_entry.size;
 524       ++iov_index;
 525
 526       want += i_entry.size;
 527
 528       last_offset = i_entry.file_offset + i_entry.size;
 529     }
 530
 531   this->reopen_descriptor();
 532
 533   gold_assert(iov_index < sizeof iov / sizeof iov[0]);
 534
 535   if (::lseek(this->descriptor_, base + first_offset, SEEK_SET) < 0)
 536     gold_fatal(_("%s: lseek failed: %s"),
 537                this->filename().c_str(), strerror(errno));
 538
 539   ssize_t got = ::readv(this->descriptor_, iov, iov_index);
 540
 541   if (got < 0)
 542     gold_fatal(_("%s: readv failed: %s"),
 543                this->filename().c_str(), strerror(errno));
 544   if (got != want)
 545     gold_fatal(_("%s: file too short: read only %zd of %zd bytes at %lld"),
 546                this->filename().c_str(),
 547                got, want, static_cast<long long>(base + first_offset));
 548 }
 549
 550 // Read several pieces of data from the file.
 551
 552 void
 553 File_read::read_multiple(off_t base, const Read_multiple& rm)
 554 {
 555   size_t count = rm.size();
 556   size_t i = 0;
 557   while (i < count)
 558     {
 559       // Find up to MAX_READV_ENTRIES consecutive entries which are
 560       // less than one page apart.
 561       const Read_multiple_entry& i_entry(rm[i]);
 562       off_t i_off = i_entry.file_offset;
 563       off_t end_off = i_off + i_entry.size;
 564       size_t j;
 565       for (j = i + 1; j < count; ++j)
 566         {
 567           if (j - i >= File_read::max_readv_entries)
 568             break;
 569           const Read_multiple_entry& j_entry(rm[j]);
 570           off_t j_off = j_entry.file_offset;
 571           gold_assert(j_off >= end_off);
 572           off_t j_end_off = j_off + j_entry.size;
 573           if (j_end_off - end_off >= File_read::page_size)
 574             break;
 575           end_off = j_end_off;
 576         }
 577
 578       if (j == i + 1)
 579         this->read(base + i_off, i_entry.size, i_entry.buffer);
 580       else
 581         {
 582           File_read::View* view = this->find_view(base + i_off,
 583                                                   end_off - i_off,
 584                                                   -1U, NULL);
 585           if (view == NULL)
 586             this->do_readv(base, rm, i, j - i);
 587           else
 588             {
 589               const unsigned char* v = (view->data()
 590                                         + (base + i_off - view->start()
 591                                            + view->byteshift()));
 592               for (size_t k = i; k < j; ++k)
 593                 {
 594                   const Read_multiple_entry& k_entry(rm[k]);
 595                   gold_assert((convert_to_section_size_type(k_entry.file_offset
 596                                                            - i_off)
 597                                + k_entry.size)
 598                               <= convert_to_section_size_type(end_off
 599                                                               - i_off));
 600                   memcpy(k_entry.buffer,
 601                          v + (k_entry.file_offset - i_off),
 602                          k_entry.size);
 603                 }
 604             }
 605         }
 606
 607       i = j;
 608     }
 609 }
 610
 611 // Mark all views as no longer cached.
 612
 613 void
 614 File_read::clear_view_cache_marks()
 615 {
 616   // Just ignore this if there are multiple objects associated with
 617   // the file.  Otherwise we will wind up uncaching and freeing some
 618   // views for other objects.
 619   if (this->object_count_ > 1)
 620     return;
 621
 622   for (Views::iterator p = this->views_.begin();
 623        p != this->views_.end();
 624        ++p)
 625     p->second->clear_cache();
 626   for (Saved_views::iterator p = this->saved_views_.begin();
 627        p != this->saved_views_.end();
 628        ++p)
 629     (*p)->clear_cache();
 630 }
 631
 632 // Remove all the file views.  For a file which has multiple
 633 // associated objects (i.e., an archive), we keep accessed views
 634 // around until next time, in the hopes that they will be useful for
 635 // the next object.
 636
 637 void
 638 File_read::clear_views(bool destroying)
 639 {
 640   Views::iterator p = this->views_.begin();
 641   while (p != this->views_.end())
 642     {
 643       bool should_delete;
 644       if (p->second->is_locked())
 645         should_delete = false;
 646       else if (destroying)
 647         should_delete = true;
 648       else if (p->second->should_cache())
 649         should_delete = false;
 650       else if (this->object_count_ > 1 && p->second->accessed())
 651         should_delete = false;
 652       else
 653         should_delete = true;
 654
 655       if (should_delete)
 656         {
 657           delete p->second;
 658
 659           // map::erase invalidates only the iterator to the deleted
 660           // element.
 661           Views::iterator pe = p;
 662           ++p;
 663           this->views_.erase(pe);
 664         }
 665       else
 666         {
 667           gold_assert(!destroying);
 668           p->second->clear_accessed();
 669           ++p;
 670         }
 671     }
 672
 673   Saved_views::iterator q = this->saved_views_.begin();
 674   while (q != this->saved_views_.end())
 675     {
 676       if (!(*q)->is_locked())
 677         {
 678           delete *q;
 679           q = this->saved_views_.erase(q);
 680         }
 681       else
 682         {
 683           gold_assert(!destroying);
 684           ++q;
 685         }
 686     }
 687 }
 688
 689 // Print statistical information to stderr.  This is used for --stats.
 690
 691 void
 692 File_read::print_stats()
 693 {
 694   fprintf(stderr, _("%s: total bytes mapped for read: %llu\n"),
 695           program_name, File_read::total_mapped_bytes);
 696   fprintf(stderr, _("%s: maximum bytes mapped for read at one time: %llu\n"),
 697           program_name, File_read::maximum_mapped_bytes);
 698 }
 699
 700 // Class File_view.
 701
 702 File_view::~File_view()
 703 {
 704   gold_assert(this->file_.is_locked());
 705   this->view_->unlock();
 706 }
 707
 708 // Class Input_file.
 709
 710 // Create a file for testing.
 711
 712 Input_file::Input_file(const Task* task, const char* name,
 713                        const unsigned char* contents, off_t size)
 714   : file_()
 715 {
 716   this->input_argument_ =
 717     new Input_file_argument(name, false, "", false,
 718                             Position_dependent_options());
 719   bool ok = file_.open(task, name, contents, size);
 720   gold_assert(ok);
 721 }
 722
 723 // Return the position dependent options in force for this file.
 724
 725 const Position_dependent_options&
 726 Input_file::options() const
 727 {
 728   return this->input_argument_->options();
 729 }
 730
 731 // Return the name given by the user.  For -lc this will return "c".
 732
 733 const char*
 734 Input_file::name() const
 735 {
 736   return this->input_argument_->name();
 737 }
 738
 739 // Return whether we are only reading symbols.
 740
 741 bool
 742 Input_file::just_symbols() const
 743 {
 744   return this->input_argument_->just_symbols();
 745 }
 746
 747 // Open the file.
 748
 749 // If the filename is not absolute, we assume it is in the current
 750 // directory *except* when:
 751 //    A) input_argument_->is_lib() is true; or
 752 //    B) input_argument_->extra_search_path() is not empty.
 753 // In both cases, we look in extra_search_path + library_path to find
 754 // the file location, rather than the current directory.
 755
 756 bool
 757 Input_file::open(const General_options& options, const Dirsearch& dirpath,
 758                  const Task* task)
 759 {
 760   std::string name;
 761
 762   // Case 1: name is an absolute file, just try to open it
 763   // Case 2: name is relative but is_lib is false and extra_search_path
 764   //         is empty
 765   if (IS_ABSOLUTE_PATH (this->input_argument_->name())
 766       || (!this->input_argument_->is_lib()
 767           && this->input_argument_->extra_search_path() == NULL))
 768     {
 769       name = this->input_argument_->name();
 770       this->found_name_ = name;
 771     }
 772   // Case 3: is_lib is true
 773   else if (this->input_argument_->is_lib())
 774     {
 775       // We don't yet support extra_search_path with -l.
 776       gold_assert(this->input_argument_->extra_search_path() == NULL);
 777       std::string n1("lib");
 778       n1 += this->input_argument_->name();
 779       std::string n2;
 780       if (options.is_static()
 781           || !this->input_argument_->options().Bdynamic())
 782         n1 += ".a";
 783       else
 784         {
 785           n2 = n1 + ".a";
 786           n1 += ".so";
 787         }
 788       name = dirpath.find(n1, n2, &this->is_in_sysroot_);
 789       if (name.empty())
 790         {
 791           gold_error(_("cannot find -l%s"),
 792                      this->input_argument_->name());
 793           return false;
 794         }
 795       if (n2.empty() || name[name.length() - 1] == 'o')
 796         this->found_name_ = n1;
 797       else
 798         this->found_name_ = n2;
 799     }
 800   // Case 4: extra_search_path is not empty
 801   else
 802     {
 803       gold_assert(this->input_argument_->extra_search_path() != NULL);
 804
 805       // First, check extra_search_path.
 806       name = this->input_argument_->extra_search_path();
 807       if (!IS_DIR_SEPARATOR (name[name.length() - 1]))
 808         name += '/';
 809       name += this->input_argument_->name();
 810       struct stat dummy_stat;
 811       if (::stat(name.c_str(), &dummy_stat) < 0)
 812         {
 813           // extra_search_path failed, so check the normal search-path.
 814           name = dirpath.find(this->input_argument_->name(), "",
 815                               &this->is_in_sysroot_);
 816           if (name.empty())
 817             {
 818               gold_error(_("cannot find %s"),
 819                          this->input_argument_->name());
 820               return false;
 821             }
 822         }
 823       this->found_name_ = this->input_argument_->name();
 824     }
 825
 826   // Now that we've figured out where the file lives, try to open it.
 827
 828   General_options::Object_format format =
 829     this->input_argument_->options().format_enum();
 830   bool ok;
 831   if (format == General_options::OBJECT_FORMAT_ELF)
 832     ok = this->file_.open(task, name);
 833   else
 834     {
 835       gold_assert(format == General_options::OBJECT_FORMAT_BINARY);
 836       ok = this->open_binary(options, task, name);
 837     }
 838
 839   if (!ok)
 840     {
 841       gold_error(_("cannot open %s: %s"),
 842                  name.c_str(), strerror(errno));
 843       return false;
 844     }
 845
 846   return true;
 847 }
 848
 849 // Open a file for --format binary.
 850
 851 bool
 852 Input_file::open_binary(const General_options&,
 853                         const Task* task, const std::string& name)
 854 {
 855   // In order to open a binary file, we need machine code, size, and
 856   // endianness.  We may not have a valid target at this point, in
 857   // which case we use the default target.
 858   const Target* target;
 859   if (parameters->target_valid())
 860     target = &parameters->target();
 861   else
 862     target = &parameters->default_target();
 863
 864   Binary_to_elf binary_to_elf(target->machine_code(),
 865                               target->get_size(),
 866                               target->is_big_endian(),
 867                               name);
 868   if (!binary_to_elf.convert(task))
 869     return false;
 870   return this->file_.open(task, name, binary_to_elf.converted_data_leak(),
 871                           binary_to_elf.converted_size());
 872 }
 873
 874 } // End namespace gold.