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1 // fileread.cc -- read files for gold
3 // Copyright 2006, 2007 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
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.
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.
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.
30 #include "filenames.h"
33 #include "dirsearch.h"
39 // Class File_read::View.
41 File_read::View::~View()
43 gold_assert(!this->is_locked());
48 if (::munmap(const_cast<unsigned char*>(this->data_
), this->size_
) != 0)
49 gold_warning(_("munmap failed: %s"), strerror(errno
));
51 File_read::current_mapped_bytes
-= this->size_
;
56 File_read::View::lock()
62 File_read::View::unlock()
64 gold_assert(this->lock_count_
> 0);
69 File_read::View::is_locked()
71 return this->lock_count_
> 0;
76 // The File_read static variables.
77 unsigned long long File_read::total_mapped_bytes
;
78 unsigned long long File_read::current_mapped_bytes
;
79 unsigned long long File_read::maximum_mapped_bytes
;
81 // The File_read class is designed to support file descriptor caching,
82 // but this is not currently implemented.
84 File_read::~File_read()
86 gold_assert(this->lock_count_
== 0);
87 if (this->descriptor_
>= 0)
89 if (close(this->descriptor_
) < 0)
90 gold_warning(_("close of %s failed: %s"),
91 this->name_
.c_str(), strerror(errno
));
92 this->descriptor_
= -1;
95 this->clear_views(true);
101 File_read::open(const std::string
& name
)
103 gold_assert(this->lock_count_
== 0
104 && this->descriptor_
< 0
105 && this->name_
.empty());
108 this->descriptor_
= ::open(this->name_
.c_str(), O_RDONLY
);
110 if (this->descriptor_
>= 0)
113 if (::fstat(this->descriptor_
, &s
) < 0)
114 gold_error(_("%s: fstat failed: %s"),
115 this->name_
.c_str(), strerror(errno
));
116 this->size_
= s
.st_size
;
121 return this->descriptor_
>= 0;
124 // Open the file for testing purposes.
127 File_read::open(const std::string
& name
, const unsigned char* contents
,
130 gold_assert(this->lock_count_
== 0
131 && this->descriptor_
< 0
132 && this->name_
.empty());
134 this->contents_
= contents
;
149 gold_assert(this->lock_count_
> 0);
151 if (this->lock_count_
== 0)
153 File_read::total_mapped_bytes
+= this->mapped_bytes_
;
154 File_read::current_mapped_bytes
+= this->mapped_bytes_
;
155 this->mapped_bytes_
= 0;
156 if (File_read::current_mapped_bytes
> File_read::maximum_mapped_bytes
)
157 File_read::maximum_mapped_bytes
= File_read::current_mapped_bytes
;
159 this->clear_views(false);
164 File_read::is_locked() const
166 return this->lock_count_
> 0;
169 // See if we have a view which covers the file starting at START for
170 // SIZE bytes. Return a pointer to the View if found, NULL if not.
172 inline File_read::View
*
173 File_read::find_view(off_t start
, off_t size
) const
175 off_t page
= File_read::page_offset(start
);
176 Views::const_iterator p
= this->views_
.find(page
);
177 if (p
== this->views_
.end())
179 if (p
->second
->size() - (start
- page
) < size
)
184 // Read SIZE bytes from the file starting at offset START. Read into
188 File_read::do_read(off_t start
, off_t size
, void* p
) const
191 if (this->contents_
!= NULL
)
193 bytes
= this->size_
- start
;
196 memcpy(p
, this->contents_
+ start
, size
);
202 bytes
= ::pread(this->descriptor_
, p
, size
, start
);
208 gold_fatal(_("%s: pread failed: %s"),
209 this->filename().c_str(), strerror(errno
));
214 gold_fatal(_("%s: file too short: read only %lld of %lld bytes at %lld"),
215 this->filename().c_str(),
216 static_cast<long long>(bytes
),
217 static_cast<long long>(size
),
218 static_cast<long long>(start
));
221 // Read data from the file.
224 File_read::read(off_t start
, off_t size
, void* p
) const
226 File_read::View
* pv
= this->find_view(start
, size
);
229 memcpy(p
, pv
->data() + (start
- pv
->start()), size
);
233 this->do_read(start
, size
, p
);
236 // Find an existing view or make a new one.
239 File_read::find_or_make_view(off_t start
, off_t size
, bool cache
)
241 gold_assert(this->lock_count_
> 0);
243 off_t poff
= File_read::page_offset(start
);
245 File_read::View
* const vnull
= NULL
;
246 std::pair
<Views::iterator
, bool> ins
=
247 this->views_
.insert(std::make_pair(poff
, vnull
));
251 // There was an existing view at this offset.
252 File_read::View
* v
= ins
.first
->second
;
253 if (v
->size() - (start
- v
->start()) >= size
)
260 // This view is not large enough.
261 this->saved_views_
.push_back(v
);
264 // We need to read data from the file. We read full pages for
265 // greater efficiency on small files.
267 off_t psize
= File_read::pages(size
+ (start
- poff
));
269 if (poff
+ psize
>= this->size_
)
271 psize
= this->size_
- poff
;
272 gold_assert(psize
>= size
);
277 if (this->contents_
!= NULL
)
279 unsigned char* p
= new unsigned char[psize
];
280 this->do_read(poff
, psize
, p
);
281 v
= new File_read::View(poff
, psize
, p
, cache
, false);
285 void* p
= ::mmap(NULL
, psize
, PROT_READ
, MAP_SHARED
,
286 this->descriptor_
, poff
);
288 gold_fatal(_("%s: mmap offset %lld size %lld failed: %s"),
289 this->filename().c_str(),
290 static_cast<long long>(poff
),
291 static_cast<long long>(psize
),
294 this->mapped_bytes_
+= psize
;
296 const unsigned char* pbytes
= static_cast<const unsigned char*>(p
);
297 v
= new File_read::View(poff
, psize
, pbytes
, cache
, true);
300 ins
.first
->second
= v
;
304 // This implementation of get_view just reads into a memory buffer,
305 // which we store on view_list_. At some point we should support
309 File_read::get_view(off_t start
, off_t size
, bool cache
)
311 gold_assert(this->lock_count_
> 0);
312 File_read::View
* pv
= this->find_or_make_view(start
, size
, cache
);
313 return pv
->data() + (start
- pv
->start());
317 File_read::get_lasting_view(off_t start
, off_t size
, bool cache
)
319 gold_assert(this->lock_count_
> 0);
320 File_read::View
* pv
= this->find_or_make_view(start
, size
, cache
);
322 return new File_view(*this, pv
, pv
->data() + (start
- pv
->start()));
325 // Remove all the file views.
328 File_read::clear_views(bool destroying
)
330 Views::iterator p
= this->views_
.begin();
331 while (p
!= this->views_
.end())
333 if (!p
->second
->is_locked()
334 && (destroying
|| !p
->second
->should_cache()))
338 // map::erase invalidates only the iterator to the deleted
340 Views::iterator pe
= p
;
342 this->views_
.erase(pe
);
346 gold_assert(!destroying
);
351 Saved_views::iterator q
= this->saved_views_
.begin();
352 while (q
!= this->saved_views_
.end())
354 if (!(*q
)->is_locked()
355 && (destroying
|| !(*q
)->should_cache()))
358 q
= this->saved_views_
.erase(q
);
362 gold_assert(!destroying
);
368 // Print statistical information to stderr. This is used for --stats.
371 File_read::print_stats()
373 fprintf(stderr
, _("%s: total bytes mapped for read: %llu\n"),
374 program_name
, File_read::total_mapped_bytes
);
375 fprintf(stderr
, _("%s: maximum bytes mapped for read at one time: %llu\n"),
376 program_name
, File_read::maximum_mapped_bytes
);
381 File_view::~File_view()
383 gold_assert(this->file_
.is_locked());
384 this->view_
->unlock();
389 // Create a file for testing.
391 Input_file::Input_file(const char* name
, const unsigned char* contents
,
395 this->input_argument_
=
396 new Input_file_argument(name
, false, "", Position_dependent_options());
397 bool ok
= file_
.open(name
, contents
, size
);
403 // If the filename is not absolute, we assume it is in the current
404 // directory *except* when:
405 // A) input_argument_->is_lib() is true; or
406 // B) input_argument_->extra_search_path() is not empty.
407 // In both cases, we look in extra_search_path + library_path to find
408 // the file location, rather than the current directory.
411 Input_file::open(const General_options
& options
, const Dirsearch
& dirpath
)
415 // Case 1: name is an absolute file, just try to open it
416 // Case 2: name is relative but is_lib is false and extra_search_path
418 if (IS_ABSOLUTE_PATH (this->input_argument_
->name())
419 || (!this->input_argument_
->is_lib()
420 && this->input_argument_
->extra_search_path() == NULL
))
422 name
= this->input_argument_
->name();
423 this->found_name_
= name
;
425 // Case 3: is_lib is true
426 else if (this->input_argument_
->is_lib())
428 // We don't yet support extra_search_path with -l.
429 gold_assert(this->input_argument_
->extra_search_path() == NULL
);
430 std::string
n1("lib");
431 n1
+= this->input_argument_
->name();
433 if (options
.is_static()
434 || this->input_argument_
->options().do_static_search())
441 name
= dirpath
.find(n1
, n2
, &this->is_in_sysroot_
);
444 gold_error(_("cannot find -l%s"),
445 this->input_argument_
->name());
448 if (n2
.empty() || name
[name
.length() - 1] == 'o')
449 this->found_name_
= n1
;
451 this->found_name_
= n2
;
453 // Case 4: extra_search_path is not empty
456 gold_assert(this->input_argument_
->extra_search_path() != NULL
);
458 // First, check extra_search_path.
459 name
= this->input_argument_
->extra_search_path();
460 if (!IS_DIR_SEPARATOR (name
[name
.length() - 1]))
462 name
+= this->input_argument_
->name();
463 struct stat dummy_stat
;
464 if (::stat(name
.c_str(), &dummy_stat
) < 0)
466 // extra_search_path failed, so check the normal search-path.
467 name
= dirpath
.find(this->input_argument_
->name(), "",
468 &this->is_in_sysroot_
);
471 gold_error(_("cannot find %s"),
472 this->input_argument_
->name());
476 this->found_name_
= this->input_argument_
->name();
479 // Now that we've figured out where the file lives, try to open it.
480 if (!this->file_
.open(name
))
482 gold_error(_("cannot open %s: %s"),
483 name
.c_str(), strerror(errno
));
490 } // End namespace gold.