Revert -Wshadow changes, all changes from:
[external/binutils.git] / 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 <sys/stat.h>
32 #include "filenames.h"
33
34 #include "debug.h"
35 #include "parameters.h"
36 #include "options.h"
37 #include "dirsearch.h"
38 #include "target.h"
39 #include "binary.h"
40 #include "descriptors.h"
41 #include "fileread.h"
42
43 #ifndef HAVE_READV
44 struct iovec { void* iov_base; size_t iov_len };
45 ssize_t
46 readv(int, const iovec*, int)
47 {
48   gold_unreachable();
49 }
50 #endif
51
52 namespace gold
53 {
54
55 // Class File_read::View.
56
57 File_read::View::~View()
58 {
59   gold_assert(!this->is_locked());
60   switch (this->data_ownership_)
61     {
62     case DATA_ALLOCATED_ARRAY:
63       delete[] this->data_;
64       break;
65     case DATA_MMAPPED:
66       if (::munmap(const_cast<unsigned char*>(this->data_), this->size_) != 0)
67         gold_warning(_("munmap failed: %s"), strerror(errno));
68       File_read::current_mapped_bytes -= this->size_;
69       break;
70     case DATA_NOT_OWNED:
71       break;
72     default:
73       gold_unreachable();
74     }
75 }
76
77 void
78 File_read::View::lock()
79 {
80   ++this->lock_count_;
81 }
82
83 void
84 File_read::View::unlock()
85 {
86   gold_assert(this->lock_count_ > 0);
87   --this->lock_count_;
88 }
89
90 bool
91 File_read::View::is_locked()
92 {
93   return this->lock_count_ > 0;
94 }
95
96 // Class File_read.
97
98 // The File_read static variables.
99 unsigned long long File_read::total_mapped_bytes;
100 unsigned long long File_read::current_mapped_bytes;
101 unsigned long long File_read::maximum_mapped_bytes;
102
103 File_read::~File_read()
104 {
105   gold_assert(this->token_.is_writable());
106   if (this->is_descriptor_opened_)
107     {
108       release_descriptor(this->descriptor_, true);
109       this->descriptor_ = -1;
110       this->is_descriptor_opened_ = false;
111     }
112   this->name_.clear();
113   this->clear_views(true);
114   if (this->whole_file_view_)
115     delete this->whole_file_view_;
116 }
117
118 // Open the file.
119
120 bool
121 File_read::open(const Task* task, const std::string& name)
122 {
123   gold_assert(this->token_.is_writable()
124               && this->descriptor_ < 0
125               && !this->is_descriptor_opened_
126               && this->name_.empty());
127   this->name_ = name;
128
129   this->descriptor_ = open_descriptor(-1, this->name_.c_str(),
130                                       O_RDONLY);
131
132   if (this->descriptor_ >= 0)
133     {
134       this->is_descriptor_opened_ = true;
135       struct stat s;
136       if (::fstat(this->descriptor_, &s) < 0)
137         gold_error(_("%s: fstat failed: %s"),
138                    this->name_.c_str(), strerror(errno));
139       this->size_ = s.st_size;
140       gold_debug(DEBUG_FILES, "Attempt to open %s succeeded",
141                  this->name_.c_str());
142
143       // Options may not yet be ready e.g. when reading a version
144       // script.  We then default to --no-keep-files-mapped.
145       if (parameters->options_valid()
146           && parameters->options().keep_files_mapped())
147         {
148           const unsigned char* contents = static_cast<const unsigned char*>(
149               ::mmap(NULL, this->size_, PROT_READ, MAP_PRIVATE,
150                      this->descriptor_, 0));
151           if (contents == MAP_FAILED)
152             gold_fatal(_("%s: mmap failed: %s"), this->filename().c_str(),
153                        strerror(errno));
154           this->whole_file_view_ = new View(0, this->size_, contents, 0, false,
155                                             View::DATA_MMAPPED);
156           this->mapped_bytes_ += this->size_;
157         }
158
159       this->token_.add_writer(task);
160     }
161
162   return this->descriptor_ >= 0;
163 }
164
165 // Open the file with the contents in memory.
166
167 bool
168 File_read::open(const Task* task, const std::string& name,
169                 const unsigned char* contents, off_t size)
170 {
171   gold_assert(this->token_.is_writable()
172               && this->descriptor_ < 0
173               && !this->is_descriptor_opened_
174               && this->name_.empty());
175   this->name_ = name;
176   this->whole_file_view_ = new View(0, size, contents, 0, false,
177                                     View::DATA_NOT_OWNED);
178   this->size_ = size;
179   this->token_.add_writer(task);
180   return true;
181 }
182
183 // Reopen a descriptor if necessary.
184
185 void
186 File_read::reopen_descriptor()
187 {
188   if (!this->is_descriptor_opened_)
189     {
190       this->descriptor_ = open_descriptor(this->descriptor_,
191                                           this->name_.c_str(),
192                                           O_RDONLY);
193       if (this->descriptor_ < 0)
194         gold_fatal(_("could not reopen file %s"), this->name_.c_str());
195       this->is_descriptor_opened_ = true;
196     }
197 }
198
199 // Release the file.  This is called when we are done with the file in
200 // a Task.
201
202 void
203 File_read::release()
204 {
205   gold_assert(this->is_locked());
206
207   File_read::total_mapped_bytes += this->mapped_bytes_;
208   File_read::current_mapped_bytes += this->mapped_bytes_;
209   this->mapped_bytes_ = 0;
210   if (File_read::current_mapped_bytes > File_read::maximum_mapped_bytes)
211     File_read::maximum_mapped_bytes = File_read::current_mapped_bytes;
212
213   // Only clear views if there is only one attached object.  Otherwise
214   // we waste time trying to clear cached archive views.  Similarly
215   // for releasing the descriptor.
216   if (this->object_count_ <= 1)
217     {
218       this->clear_views(false);
219       if (this->is_descriptor_opened_)
220         {
221           release_descriptor(this->descriptor_, false);
222           this->is_descriptor_opened_ = false;
223         }
224     }
225
226   this->released_ = true;
227 }
228
229 // Lock the file.
230
231 void
232 File_read::lock(const Task* task)
233 {
234   gold_assert(this->released_);
235   this->token_.add_writer(task);
236   this->released_ = false;
237 }
238
239 // Unlock the file.
240
241 void
242 File_read::unlock(const Task* task)
243 {
244   this->release();
245   this->token_.remove_writer(task);
246 }
247
248 // Return whether the file is locked.
249
250 bool
251 File_read::is_locked() const
252 {
253   if (!this->token_.is_writable())
254     return true;
255   // The file is not locked, so it should have been released.
256   gold_assert(this->released_);
257   return false;
258 }
259
260 // See if we have a view which covers the file starting at START for
261 // SIZE bytes.  Return a pointer to the View if found, NULL if not.
262 // If BYTESHIFT is not -1U, the returned View must have the specified
263 // byte shift; otherwise, it may have any byte shift.  If VSHIFTED is
264 // not NULL, this sets *VSHIFTED to a view which would have worked if
265 // not for the requested BYTESHIFT.
266
267 inline File_read::View*
268 File_read::find_view(off_t start, section_size_type size,
269                      unsigned int byteshift, File_read::View** vshifted) const
270 {
271   if (vshifted != NULL)
272     *vshifted = NULL;
273
274   // If we have the whole file mmapped, and the alignment is right,
275   // we can return it.
276   if (this->whole_file_view_)
277     if (byteshift == -1U || byteshift == 0)
278       return this->whole_file_view_;
279
280   off_t page = File_read::page_offset(start);
281
282   unsigned int bszero = 0;
283   Views::const_iterator p = this->views_.upper_bound(std::make_pair(page - 1,
284                                                                     bszero));
285
286   while (p != this->views_.end() && p->first.first <= page)
287     {
288       if (p->second->start() <= start
289           && (p->second->start() + static_cast<off_t>(p->second->size())
290               >= start + static_cast<off_t>(size)))
291         {
292           if (byteshift == -1U || byteshift == p->second->byteshift())
293             {
294               p->second->set_accessed();
295               return p->second;
296             }
297
298           if (vshifted != NULL && *vshifted == NULL)
299             *vshifted = p->second;
300         }
301
302       ++p;
303     }
304
305   return NULL;
306 }
307
308 // Read SIZE bytes from the file starting at offset START.  Read into
309 // the buffer at P.
310
311 void
312 File_read::do_read(off_t start, section_size_type size, void* p)
313 {
314   ssize_t bytes;
315   if (this->whole_file_view_ != NULL)
316     {
317       bytes = this->size_ - start;
318       if (static_cast<section_size_type>(bytes) >= size)
319         {
320           memcpy(p, this->whole_file_view_->data() + start, size);
321           return;
322         }
323     }
324   else
325     {
326       this->reopen_descriptor();
327       bytes = ::pread(this->descriptor_, p, size, start);
328       if (static_cast<section_size_type>(bytes) == size)
329         return;
330
331       if (bytes < 0)
332         {
333           gold_fatal(_("%s: pread failed: %s"),
334                      this->filename().c_str(), strerror(errno));
335           return;
336         }
337     }
338
339   gold_fatal(_("%s: file too short: read only %lld of %lld bytes at %lld"),
340              this->filename().c_str(),
341              static_cast<long long>(bytes),
342              static_cast<long long>(size),
343              static_cast<long long>(start));
344 }
345
346 // Read data from the file.
347
348 void
349 File_read::read(off_t start, section_size_type size, void* p)
350 {
351   const File_read::View* pv = this->find_view(start, size, -1U, NULL);
352   if (pv != NULL)
353     {
354       memcpy(p, pv->data() + (start - pv->start() + pv->byteshift()), size);
355       return;
356     }
357
358   this->do_read(start, size, p);
359 }
360
361 // Add a new view.  There may already be an existing view at this
362 // offset.  If there is, the new view will be larger, and should
363 // replace the old view.
364
365 void
366 File_read::add_view(File_read::View* v)
367 {
368   std::pair<Views::iterator, bool> ins =
369     this->views_.insert(std::make_pair(std::make_pair(v->start(),
370                                                       v->byteshift()),
371                                        v));
372   if (ins.second)
373     return;
374
375   // There was an existing view at this offset.  It must not be large
376   // enough.  We can't delete it here, since something might be using
377   // it; we put it on a list to be deleted when the file is unlocked.
378   File_read::View* vold = ins.first->second;
379   gold_assert(vold->size() < v->size());
380   if (vold->should_cache())
381     {
382       v->set_cache();
383       vold->clear_cache();
384     }
385   this->saved_views_.push_back(vold);
386
387   ins.first->second = v;
388 }
389
390 // Make a new view with a specified byteshift, reading the data from
391 // the file.
392
393 File_read::View*
394 File_read::make_view(off_t start, section_size_type size,
395                      unsigned int byteshift, bool cache)
396 {
397   gold_assert(size > 0);
398
399   // Check that start and end of the view are within the file.
400   if (start > this->size_
401       || (static_cast<unsigned long long>(size)
402           > static_cast<unsigned long long>(this->size_ - start)))
403     gold_fatal(_("%s: attempt to map %lld bytes at offset %lld exceeds "
404                  "size of file; the file may be corrupt"),
405                    this->filename().c_str(),
406                    static_cast<long long>(size),
407                    static_cast<long long>(start));
408
409   off_t poff = File_read::page_offset(start);
410
411   section_size_type psize = File_read::pages(size + (start - poff));
412
413   if (poff + static_cast<off_t>(psize) >= this->size_)
414     {
415       psize = this->size_ - poff;
416       gold_assert(psize >= size);
417     }
418
419   File_read::View* v;
420   if (this->whole_file_view_ != NULL || byteshift != 0)
421     {
422       unsigned char* p = new unsigned char[psize + byteshift];
423       memset(p, 0, byteshift);
424       this->do_read(poff, psize, p + byteshift);
425       v = new File_read::View(poff, psize, p, byteshift, cache,
426                               View::DATA_ALLOCATED_ARRAY);
427     }
428   else
429     {
430       this->reopen_descriptor();
431       void* p = ::mmap(NULL, psize, PROT_READ, MAP_PRIVATE,
432                        this->descriptor_, poff);
433       if (p == MAP_FAILED)
434         gold_fatal(_("%s: mmap offset %lld size %lld failed: %s"),
435                    this->filename().c_str(),
436                    static_cast<long long>(poff),
437                    static_cast<long long>(psize),
438                    strerror(errno));
439
440       this->mapped_bytes_ += psize;
441
442       const unsigned char* pbytes = static_cast<const unsigned char*>(p);
443       v = new File_read::View(poff, psize, pbytes, 0, cache,
444                               View::DATA_MMAPPED);
445     }
446
447   this->add_view(v);
448
449   return v;
450 }
451
452 // Find a View or make a new one, shifted as required by the file
453 // offset OFFSET and ALIGNED.
454
455 File_read::View*
456 File_read::find_or_make_view(off_t offset, off_t start,
457                              section_size_type size, bool aligned, bool cache)
458 {
459   unsigned int byteshift;
460   if (offset == 0)
461     byteshift = 0;
462   else
463     {
464       unsigned int target_size = (!parameters->target_valid()
465                                   ? 64
466                                   : parameters->target().get_size());
467       byteshift = offset & ((target_size / 8) - 1);
468
469       // Set BYTESHIFT to the number of dummy bytes which must be
470       // inserted before the data in order for this data to be
471       // aligned.
472       if (byteshift != 0)
473         byteshift = (target_size / 8) - byteshift;
474     }
475
476   // Try to find a View with the required BYTESHIFT.
477   File_read::View* vshifted;
478   File_read::View* v = this->find_view(offset + start, size,
479                                        aligned ? byteshift : -1U,
480                                        &vshifted);
481   if (v != NULL)
482     {
483       if (cache)
484         v->set_cache();
485       return v;
486     }
487
488   // If VSHIFTED is not NULL, then it has the data we need, but with
489   // the wrong byteshift.
490   v = vshifted;
491   if (v != NULL)
492     {
493       gold_assert(aligned);
494
495       unsigned char* pbytes = new unsigned char[v->size() + byteshift];
496       memset(pbytes, 0, byteshift);
497       memcpy(pbytes + byteshift, v->data() + v->byteshift(), v->size());
498
499       File_read::View* shifted_view =
500           new File_read::View(v->start(), v->size(), pbytes, byteshift,
501                               cache, View::DATA_ALLOCATED_ARRAY);
502
503       this->add_view(shifted_view);
504       return shifted_view;
505     }
506
507   // Make a new view.  If we don't need an aligned view, use a
508   // byteshift of 0, so that we can use mmap.
509   return this->make_view(offset + start, size,
510                          aligned ? byteshift : 0,
511                          cache);
512 }
513
514 // Get a view into the file.
515
516 const unsigned char*
517 File_read::get_view(off_t offset, off_t start, section_size_type size,
518                     bool aligned, bool cache)
519 {
520   File_read::View* pv = this->find_or_make_view(offset, start, size,
521                                                 aligned, cache);
522   return pv->data() + (offset + start - pv->start() + pv->byteshift());
523 }
524
525 File_view*
526 File_read::get_lasting_view(off_t offset, off_t start, section_size_type size,
527                             bool aligned, bool cache)
528 {
529   File_read::View* pv = this->find_or_make_view(offset, start, size,
530                                                 aligned, cache);
531   pv->lock();
532   return new File_view(*this, pv,
533                        (pv->data()
534                         + (offset + start - pv->start() + pv->byteshift())));
535 }
536
537 // Use readv to read COUNT entries from RM starting at START.  BASE
538 // must be added to all file offsets in RM.
539
540 void
541 File_read::do_readv(off_t base, const Read_multiple& rm, size_t start,
542                     size_t count)
543 {
544   unsigned char discard[File_read::page_size];
545   iovec iov[File_read::max_readv_entries * 2];
546   size_t iov_index = 0;
547
548   off_t first_offset = rm[start].file_offset;
549   off_t last_offset = first_offset;
550   ssize_t want = 0;
551   for (size_t i = 0; i < count; ++i)
552     {
553       const Read_multiple_entry& i_entry(rm[start + i]);
554
555       if (i_entry.file_offset > last_offset)
556         {
557           size_t skip = i_entry.file_offset - last_offset;
558           gold_assert(skip <= sizeof discard);
559
560           iov[iov_index].iov_base = discard;
561           iov[iov_index].iov_len = skip;
562           ++iov_index;
563
564           want += skip;
565         }
566
567       iov[iov_index].iov_base = i_entry.buffer;
568       iov[iov_index].iov_len = i_entry.size;
569       ++iov_index;
570
571       want += i_entry.size;
572
573       last_offset = i_entry.file_offset + i_entry.size;
574     }
575
576   this->reopen_descriptor();
577
578   gold_assert(iov_index < sizeof iov / sizeof iov[0]);
579
580   if (::lseek(this->descriptor_, base + first_offset, SEEK_SET) < 0)
581     gold_fatal(_("%s: lseek failed: %s"),
582                this->filename().c_str(), strerror(errno));
583
584   ssize_t got = ::readv(this->descriptor_, iov, iov_index);
585
586   if (got < 0)
587     gold_fatal(_("%s: readv failed: %s"),
588                this->filename().c_str(), strerror(errno));
589   if (got != want)
590     gold_fatal(_("%s: file too short: read only %zd of %zd bytes at %lld"),
591                this->filename().c_str(),
592                got, want, static_cast<long long>(base + first_offset));
593 }
594
595 // Read several pieces of data from the file.
596
597 void
598 File_read::read_multiple(off_t base, const Read_multiple& rm)
599 {
600   size_t count = rm.size();
601   size_t i = 0;
602   while (i < count)
603     {
604       // Find up to MAX_READV_ENTRIES consecutive entries which are
605       // less than one page apart.
606       const Read_multiple_entry& i_entry(rm[i]);
607       off_t i_off = i_entry.file_offset;
608       off_t end_off = i_off + i_entry.size;
609       size_t j;
610       for (j = i + 1; j < count; ++j)
611         {
612           if (j - i >= File_read::max_readv_entries)
613             break;
614           const Read_multiple_entry& j_entry(rm[j]);
615           off_t j_off = j_entry.file_offset;
616           gold_assert(j_off >= end_off);
617           off_t j_end_off = j_off + j_entry.size;
618           if (j_end_off - end_off >= File_read::page_size)
619             break;
620           end_off = j_end_off;
621         }
622
623       if (j == i + 1)
624         this->read(base + i_off, i_entry.size, i_entry.buffer);
625       else
626         {
627           File_read::View* view = this->find_view(base + i_off,
628                                                   end_off - i_off,
629                                                   -1U, NULL);
630           if (view == NULL)
631             this->do_readv(base, rm, i, j - i);
632           else
633             {
634               const unsigned char* v = (view->data()
635                                         + (base + i_off - view->start()
636                                            + view->byteshift()));
637               for (size_t k = i; k < j; ++k)
638                 {
639                   const Read_multiple_entry& k_entry(rm[k]);
640                   gold_assert((convert_to_section_size_type(k_entry.file_offset
641                                                            - i_off)
642                                + k_entry.size)
643                               <= convert_to_section_size_type(end_off
644                                                               - i_off));
645                   memcpy(k_entry.buffer,
646                          v + (k_entry.file_offset - i_off),
647                          k_entry.size);
648                 }
649             }
650         }
651
652       i = j;
653     }
654 }
655
656 // Mark all views as no longer cached.
657
658 void
659 File_read::clear_view_cache_marks()
660 {
661   // Just ignore this if there are multiple objects associated with
662   // the file.  Otherwise we will wind up uncaching and freeing some
663   // views for other objects.
664   if (this->object_count_ > 1)
665     return;
666
667   for (Views::iterator p = this->views_.begin();
668        p != this->views_.end();
669        ++p)
670     p->second->clear_cache();
671   for (Saved_views::iterator p = this->saved_views_.begin();
672        p != this->saved_views_.end();
673        ++p)
674     (*p)->clear_cache();
675 }
676
677 // Remove all the file views.  For a file which has multiple
678 // associated objects (i.e., an archive), we keep accessed views
679 // around until next time, in the hopes that they will be useful for
680 // the next object.
681
682 void
683 File_read::clear_views(bool destroying)
684 {
685   Views::iterator p = this->views_.begin();
686   while (p != this->views_.end())
687     {
688       bool should_delete;
689       if (p->second->is_locked())
690         should_delete = false;
691       else if (destroying)
692         should_delete = true;
693       else if (p->second->should_cache())
694         should_delete = false;
695       else if (this->object_count_ > 1 && p->second->accessed())
696         should_delete = false;
697       else
698         should_delete = true;
699
700       if (should_delete)
701         {
702           delete p->second;
703
704           // map::erase invalidates only the iterator to the deleted
705           // element.
706           Views::iterator pe = p;
707           ++p;
708           this->views_.erase(pe);
709         }
710       else
711         {
712           gold_assert(!destroying);
713           p->second->clear_accessed();
714           ++p;
715         }
716     }
717
718   Saved_views::iterator q = this->saved_views_.begin();
719   while (q != this->saved_views_.end())
720     {
721       if (!(*q)->is_locked())
722         {
723           delete *q;
724           q = this->saved_views_.erase(q);
725         }
726       else
727         {
728           gold_assert(!destroying);
729           ++q;
730         }
731     }
732 }
733
734 // Print statistical information to stderr.  This is used for --stats.
735
736 void
737 File_read::print_stats()
738 {
739   fprintf(stderr, _("%s: total bytes mapped for read: %llu\n"),
740           program_name, File_read::total_mapped_bytes);
741   fprintf(stderr, _("%s: maximum bytes mapped for read at one time: %llu\n"),
742           program_name, File_read::maximum_mapped_bytes);
743 }
744
745 // Class File_view.
746
747 File_view::~File_view()
748 {
749   gold_assert(this->file_.is_locked());
750   this->view_->unlock();
751 }
752
753 // Class Input_file.
754
755 // Create a file for testing.
756
757 Input_file::Input_file(const Task* task, const char* name,
758                        const unsigned char* contents, off_t size)
759   : file_()
760 {
761   this->input_argument_ =
762     new Input_file_argument(name, Input_file_argument::INPUT_FILE_TYPE_FILE,
763                             "", false, Position_dependent_options());
764   bool ok = this->file_.open(task, name, contents, size);
765   gold_assert(ok);
766 }
767
768 // Return the position dependent options in force for this file.
769
770 const Position_dependent_options&
771 Input_file::options() const
772 {
773   return this->input_argument_->options();
774 }
775
776 // Return the name given by the user.  For -lc this will return "c".
777
778 const char*
779 Input_file::name() const
780 {
781   return this->input_argument_->name();
782 }
783
784 // Return whether this file is in a system directory.
785
786 bool
787 Input_file::is_in_system_directory() const
788 {
789   if (this->is_in_sysroot())
790     return true;
791   return parameters->options().is_in_system_directory(this->filename());
792 }
793
794 // Return whether we are only reading symbols.
795
796 bool
797 Input_file::just_symbols() const
798 {
799   return this->input_argument_->just_symbols();
800 }
801
802 // Return whether this is a file that we will search for in the list
803 // of directories.
804
805 bool
806 Input_file::will_search_for() const
807 {
808   return (!IS_ABSOLUTE_PATH(this->input_argument_->name())
809           && (this->input_argument_->is_lib()
810               || this->input_argument_->is_searched_file()
811               || this->input_argument_->extra_search_path() != NULL));
812 }
813
814 // Return the file last modification time.  Calls gold_fatal if the stat
815 // system call failed.
816
817 Timespec
818 File_read::get_mtime()
819 {
820   struct stat file_stat;
821   this->reopen_descriptor();
822   
823   if (fstat(this->descriptor_, &file_stat) < 0)
824     gold_fatal(_("%s: stat failed: %s"), this->name_.c_str(),
825                strerror(errno));
826 #ifdef HAVE_STAT_ST_MTIM
827   return Timespec(file_stat.st_mtim.tv_sec, file_stat.st_mtim.tv_nsec);
828 #else
829   return Timespec(file_stat.st_mtime, 0);
830 #endif
831 }
832
833 // Open the file.
834
835 // If the filename is not absolute, we assume it is in the current
836 // directory *except* when:
837 //    A) input_argument_->is_lib() is true;
838 //    B) input_argument_->is_searched_file() is true; or
839 //    C) input_argument_->extra_search_path() is not empty.
840 // In each, we look in extra_search_path + library_path to find
841 // the file location, rather than the current directory.
842
843 bool
844 Input_file::open(const Dirsearch& dirpath, const Task* task, int *pindex)
845 {
846   std::string name;
847
848   // Case 1: name is an absolute file, just try to open it
849   // Case 2: name is relative but is_lib is false, is_searched_file is false,
850   //         and extra_search_path is empty
851   if (IS_ABSOLUTE_PATH(this->input_argument_->name())
852       || (!this->input_argument_->is_lib()
853           && !this->input_argument_->is_searched_file()
854           && this->input_argument_->extra_search_path() == NULL))
855     {
856       name = this->input_argument_->name();
857       this->found_name_ = name;
858     }
859   // Case 3: is_lib is true or is_searched_file is true
860   else if (this->input_argument_->is_lib()
861            || this->input_argument_->is_searched_file())
862     {
863       // We don't yet support extra_search_path with -l.
864       gold_assert(this->input_argument_->extra_search_path() == NULL);
865       std::string n1, n2;
866       if (this->input_argument_->is_lib())
867         {
868           n1 = "lib";
869           n1 += this->input_argument_->name();
870           if (parameters->options().is_static()
871               || !this->input_argument_->options().Bdynamic())
872             n1 += ".a";
873           else
874             {
875               n2 = n1 + ".a";
876               n1 += ".so";
877             }
878         }
879       else
880         n1 = this->input_argument_->name();
881       name = dirpath.find(n1, n2, &this->is_in_sysroot_, pindex);
882       if (name.empty())
883         {
884           gold_error(_("cannot find %s%s"),
885                      this->input_argument_->is_lib() ? "-l" : "",
886                      this->input_argument_->name());
887           return false;
888         }
889       if (n2.empty() || name[name.length() - 1] == 'o')
890         this->found_name_ = n1;
891       else
892         this->found_name_ = n2;
893     }
894   // Case 4: extra_search_path is not empty
895   else
896     {
897       gold_assert(this->input_argument_->extra_search_path() != NULL);
898
899       // First, check extra_search_path.
900       name = this->input_argument_->extra_search_path();
901       if (!IS_DIR_SEPARATOR (name[name.length() - 1]))
902         name += '/';
903       name += this->input_argument_->name();
904       struct stat dummy_stat;
905       if (*pindex > 0 || ::stat(name.c_str(), &dummy_stat) < 0)
906         {
907           // extra_search_path failed, so check the normal search-path.
908           int index = *pindex;
909           if (index > 0)
910             --index;
911           name = dirpath.find(this->input_argument_->name(), "",
912                               &this->is_in_sysroot_, &index);
913           if (name.empty())
914             {
915               gold_error(_("cannot find %s"),
916                          this->input_argument_->name());
917               return false;
918             }
919           *pindex = index + 1;
920         }
921       this->found_name_ = this->input_argument_->name();
922     }
923
924   // Now that we've figured out where the file lives, try to open it.
925
926   General_options::Object_format format =
927     this->input_argument_->options().format_enum();
928   bool ok;
929   if (format == General_options::OBJECT_FORMAT_ELF)
930     ok = this->file_.open(task, name);
931   else
932     {
933       gold_assert(format == General_options::OBJECT_FORMAT_BINARY);
934       ok = this->open_binary(task, name);
935     }
936
937   if (!ok)
938     {
939       gold_error(_("cannot open %s: %s"),
940                  name.c_str(), strerror(errno));
941       return false;
942     }
943
944   return true;
945 }
946
947 // Open a file for --format binary.
948
949 bool
950 Input_file::open_binary(const Task* task, const std::string& name)
951 {
952   // In order to open a binary file, we need machine code, size, and
953   // endianness.  We may not have a valid target at this point, in
954   // which case we use the default target.
955   parameters_force_valid_target();
956   const Target& target(parameters->target());
957
958   Binary_to_elf binary_to_elf(target.machine_code(),
959                               target.get_size(),
960                               target.is_big_endian(),
961                               name);
962   if (!binary_to_elf.convert(task))
963     return false;
964   return this->file_.open(task, name, binary_to_elf.converted_data_leak(),
965                           binary_to_elf.converted_size());
966 }
967
968 } // End namespace gold.