| 1 | // fileread.cc -- read files for gold |
| 2 | |
| 3 | // Copyright 2006, 2007, 2008 Free Software Foundation, Inc. |
| 4 | // Written by Ian Lance Taylor <iant@google.com>. |
| 5 | |
| 6 | // This file is part of gold. |
| 7 | |
| 8 | // This program is free software; you can redistribute it and/or modify |
| 9 | // it under the terms of the GNU General Public License as published by |
| 10 | // the Free Software Foundation; either version 3 of the License, or |
| 11 | // (at your option) any later version. |
| 12 | |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | // MA 02110-1301, USA. |
| 22 | |
| 23 | #include "gold.h" |
| 24 | |
| 25 | #include <cstring> |
| 26 | #include <cerrno> |
| 27 | #include <fcntl.h> |
| 28 | #include <unistd.h> |
| 29 | #include <sys/mman.h> |
| 30 | #include <sys/uio.h> |
| 31 | #include "filenames.h" |
| 32 | |
| 33 | #include "debug.h" |
| 34 | #include "parameters.h" |
| 35 | #include "options.h" |
| 36 | #include "dirsearch.h" |
| 37 | #include "target.h" |
| 38 | #include "binary.h" |
| 39 | #include "fileread.h" |
| 40 | |
| 41 | namespace gold |
| 42 | { |
| 43 | |
| 44 | // Class File_read::View. |
| 45 | |
| 46 | File_read::View::~View() |
| 47 | { |
| 48 | gold_assert(!this->is_locked()); |
| 49 | if (!this->mapped_) |
| 50 | delete[] this->data_; |
| 51 | else |
| 52 | { |
| 53 | if (::munmap(const_cast<unsigned char*>(this->data_), this->size_) != 0) |
| 54 | gold_warning(_("munmap failed: %s"), strerror(errno)); |
| 55 | |
| 56 | File_read::current_mapped_bytes -= this->size_; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | void |
| 61 | File_read::View::lock() |
| 62 | { |
| 63 | ++this->lock_count_; |
| 64 | } |
| 65 | |
| 66 | void |
| 67 | File_read::View::unlock() |
| 68 | { |
| 69 | gold_assert(this->lock_count_ > 0); |
| 70 | --this->lock_count_; |
| 71 | } |
| 72 | |
| 73 | bool |
| 74 | File_read::View::is_locked() |
| 75 | { |
| 76 | return this->lock_count_ > 0; |
| 77 | } |
| 78 | |
| 79 | // Class File_read. |
| 80 | |
| 81 | // The File_read static variables. |
| 82 | unsigned long long File_read::total_mapped_bytes; |
| 83 | unsigned long long File_read::current_mapped_bytes; |
| 84 | unsigned long long File_read::maximum_mapped_bytes; |
| 85 | |
| 86 | // The File_read class is designed to support file descriptor caching, |
| 87 | // but this is not currently implemented. |
| 88 | |
| 89 | File_read::~File_read() |
| 90 | { |
| 91 | gold_assert(this->token_.is_writable()); |
| 92 | if (this->descriptor_ >= 0) |
| 93 | { |
| 94 | if (close(this->descriptor_) < 0) |
| 95 | gold_warning(_("close of %s failed: %s"), |
| 96 | this->name_.c_str(), strerror(errno)); |
| 97 | this->descriptor_ = -1; |
| 98 | } |
| 99 | this->name_.clear(); |
| 100 | this->clear_views(true); |
| 101 | } |
| 102 | |
| 103 | // Open the file. |
| 104 | |
| 105 | bool |
| 106 | File_read::open(const Task* task, const std::string& name) |
| 107 | { |
| 108 | gold_assert(this->token_.is_writable() |
| 109 | && this->descriptor_ < 0 |
| 110 | && this->name_.empty()); |
| 111 | this->name_ = name; |
| 112 | |
| 113 | this->descriptor_ = ::open(this->name_.c_str(), O_RDONLY); |
| 114 | |
| 115 | if (this->descriptor_ >= 0) |
| 116 | { |
| 117 | struct stat s; |
| 118 | if (::fstat(this->descriptor_, &s) < 0) |
| 119 | gold_error(_("%s: fstat failed: %s"), |
| 120 | this->name_.c_str(), strerror(errno)); |
| 121 | this->size_ = s.st_size; |
| 122 | gold_debug(DEBUG_FILES, "Attempt to open %s succeeded", |
| 123 | this->name_.c_str()); |
| 124 | } |
| 125 | |
| 126 | this->token_.add_writer(task); |
| 127 | |
| 128 | return this->descriptor_ >= 0; |
| 129 | } |
| 130 | |
| 131 | // Open the file with the contents in memory. |
| 132 | |
| 133 | bool |
| 134 | File_read::open(const Task* task, const std::string& name, |
| 135 | const unsigned char* contents, off_t size) |
| 136 | { |
| 137 | gold_assert(this->token_.is_writable() |
| 138 | && this->descriptor_ < 0 |
| 139 | && this->name_.empty()); |
| 140 | this->name_ = name; |
| 141 | this->contents_ = contents; |
| 142 | this->size_ = size; |
| 143 | this->token_.add_writer(task); |
| 144 | return true; |
| 145 | } |
| 146 | |
| 147 | // Release the file. This is called when we are done with the file in |
| 148 | // a Task. |
| 149 | |
| 150 | void |
| 151 | File_read::release() |
| 152 | { |
| 153 | gold_assert(this->is_locked()); |
| 154 | |
| 155 | File_read::total_mapped_bytes += this->mapped_bytes_; |
| 156 | File_read::current_mapped_bytes += this->mapped_bytes_; |
| 157 | this->mapped_bytes_ = 0; |
| 158 | if (File_read::current_mapped_bytes > File_read::maximum_mapped_bytes) |
| 159 | File_read::maximum_mapped_bytes = File_read::current_mapped_bytes; |
| 160 | |
| 161 | // Only clear views if there is only one attached object. Otherwise |
| 162 | // we waste time trying to clear cached archive views. |
| 163 | if (this->object_count_ <= 1) |
| 164 | this->clear_views(false); |
| 165 | |
| 166 | this->released_ = true; |
| 167 | } |
| 168 | |
| 169 | // Lock the file. |
| 170 | |
| 171 | void |
| 172 | File_read::lock(const Task* task) |
| 173 | { |
| 174 | gold_assert(this->released_); |
| 175 | this->token_.add_writer(task); |
| 176 | this->released_ = false; |
| 177 | } |
| 178 | |
| 179 | // Unlock the file. |
| 180 | |
| 181 | void |
| 182 | File_read::unlock(const Task* task) |
| 183 | { |
| 184 | this->release(); |
| 185 | this->token_.remove_writer(task); |
| 186 | } |
| 187 | |
| 188 | // Return whether the file is locked. |
| 189 | |
| 190 | bool |
| 191 | File_read::is_locked() const |
| 192 | { |
| 193 | if (!this->token_.is_writable()) |
| 194 | return true; |
| 195 | // The file is not locked, so it should have been released. |
| 196 | gold_assert(this->released_); |
| 197 | return false; |
| 198 | } |
| 199 | |
| 200 | // See if we have a view which covers the file starting at START for |
| 201 | // SIZE bytes. Return a pointer to the View if found, NULL if not. |
| 202 | // If BYTESHIFT is not -1U, the returned View must have the specified |
| 203 | // byte shift; otherwise, it may have any byte shift. If VSHIFTED is |
| 204 | // not NULL, this sets *VSHIFTED to a view which would have worked if |
| 205 | // not for the requested BYTESHIFT. |
| 206 | |
| 207 | inline File_read::View* |
| 208 | File_read::find_view(off_t start, section_size_type size, |
| 209 | unsigned int byteshift, File_read::View** vshifted) const |
| 210 | { |
| 211 | if (vshifted != NULL) |
| 212 | *vshifted = NULL; |
| 213 | |
| 214 | off_t page = File_read::page_offset(start); |
| 215 | |
| 216 | unsigned int bszero = 0; |
| 217 | Views::const_iterator p = this->views_.upper_bound(std::make_pair(page - 1, |
| 218 | bszero)); |
| 219 | |
| 220 | while (p != this->views_.end() && p->first.first <= page) |
| 221 | { |
| 222 | if (p->second->start() <= start |
| 223 | && (p->second->start() + static_cast<off_t>(p->second->size()) |
| 224 | >= start + static_cast<off_t>(size))) |
| 225 | { |
| 226 | if (byteshift == -1U || byteshift == p->second->byteshift()) |
| 227 | { |
| 228 | p->second->set_accessed(); |
| 229 | return p->second; |
| 230 | } |
| 231 | |
| 232 | if (vshifted != NULL && *vshifted == NULL) |
| 233 | *vshifted = p->second; |
| 234 | } |
| 235 | |
| 236 | ++p; |
| 237 | } |
| 238 | |
| 239 | return NULL; |
| 240 | } |
| 241 | |
| 242 | // Read SIZE bytes from the file starting at offset START. Read into |
| 243 | // the buffer at P. |
| 244 | |
| 245 | void |
| 246 | File_read::do_read(off_t start, section_size_type size, void* p) const |
| 247 | { |
| 248 | ssize_t bytes; |
| 249 | if (this->contents_ != NULL) |
| 250 | { |
| 251 | bytes = this->size_ - start; |
| 252 | if (static_cast<section_size_type>(bytes) >= size) |
| 253 | { |
| 254 | memcpy(p, this->contents_ + start, size); |
| 255 | return; |
| 256 | } |
| 257 | } |
| 258 | else |
| 259 | { |
| 260 | bytes = ::pread(this->descriptor_, p, size, start); |
| 261 | if (static_cast<section_size_type>(bytes) == size) |
| 262 | return; |
| 263 | |
| 264 | if (bytes < 0) |
| 265 | { |
| 266 | gold_fatal(_("%s: pread failed: %s"), |
| 267 | this->filename().c_str(), strerror(errno)); |
| 268 | return; |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | gold_fatal(_("%s: file too short: read only %lld of %lld bytes at %lld"), |
| 273 | this->filename().c_str(), |
| 274 | static_cast<long long>(bytes), |
| 275 | static_cast<long long>(size), |
| 276 | static_cast<long long>(start)); |
| 277 | } |
| 278 | |
| 279 | // Read data from the file. |
| 280 | |
| 281 | void |
| 282 | File_read::read(off_t start, section_size_type size, void* p) const |
| 283 | { |
| 284 | const File_read::View* pv = this->find_view(start, size, -1U, NULL); |
| 285 | if (pv != NULL) |
| 286 | { |
| 287 | memcpy(p, pv->data() + (start - pv->start() + pv->byteshift()), size); |
| 288 | return; |
| 289 | } |
| 290 | |
| 291 | this->do_read(start, size, p); |
| 292 | } |
| 293 | |
| 294 | // Add a new view. There may already be an existing view at this |
| 295 | // offset. If there is, the new view will be larger, and should |
| 296 | // replace the old view. |
| 297 | |
| 298 | void |
| 299 | File_read::add_view(File_read::View* v) |
| 300 | { |
| 301 | std::pair<Views::iterator, bool> ins = |
| 302 | this->views_.insert(std::make_pair(std::make_pair(v->start(), |
| 303 | v->byteshift()), |
| 304 | v)); |
| 305 | if (ins.second) |
| 306 | return; |
| 307 | |
| 308 | // There was an existing view at this offset. It must not be large |
| 309 | // enough. We can't delete it here, since something might be using |
| 310 | // it; we put it on a list to be deleted when the file is unlocked. |
| 311 | File_read::View* vold = ins.first->second; |
| 312 | gold_assert(vold->size() < v->size()); |
| 313 | if (vold->should_cache()) |
| 314 | { |
| 315 | v->set_cache(); |
| 316 | vold->clear_cache(); |
| 317 | } |
| 318 | this->saved_views_.push_back(vold); |
| 319 | |
| 320 | ins.first->second = v; |
| 321 | } |
| 322 | |
| 323 | // Make a new view with a specified byteshift, reading the data from |
| 324 | // the file. |
| 325 | |
| 326 | File_read::View* |
| 327 | File_read::make_view(off_t start, section_size_type size, |
| 328 | unsigned int byteshift, bool cache) |
| 329 | { |
| 330 | gold_assert(size > 0); |
| 331 | |
| 332 | off_t poff = File_read::page_offset(start); |
| 333 | |
| 334 | section_size_type psize = File_read::pages(size + (start - poff)); |
| 335 | |
| 336 | if (poff + static_cast<off_t>(psize) >= this->size_) |
| 337 | { |
| 338 | psize = this->size_ - poff; |
| 339 | gold_assert(psize >= size); |
| 340 | } |
| 341 | |
| 342 | File_read::View* v; |
| 343 | if (this->contents_ != NULL || byteshift != 0) |
| 344 | { |
| 345 | unsigned char* p = new unsigned char[psize + byteshift]; |
| 346 | memset(p, 0, byteshift); |
| 347 | this->do_read(poff, psize, p + byteshift); |
| 348 | v = new File_read::View(poff, psize, p, byteshift, cache, false); |
| 349 | } |
| 350 | else |
| 351 | { |
| 352 | void* p = ::mmap(NULL, psize, PROT_READ, MAP_PRIVATE, |
| 353 | this->descriptor_, poff); |
| 354 | if (p == MAP_FAILED) |
| 355 | gold_fatal(_("%s: mmap offset %lld size %lld failed: %s"), |
| 356 | this->filename().c_str(), |
| 357 | static_cast<long long>(poff), |
| 358 | static_cast<long long>(psize), |
| 359 | strerror(errno)); |
| 360 | |
| 361 | this->mapped_bytes_ += psize; |
| 362 | |
| 363 | const unsigned char* pbytes = static_cast<const unsigned char*>(p); |
| 364 | v = new File_read::View(poff, psize, pbytes, 0, cache, true); |
| 365 | } |
| 366 | |
| 367 | this->add_view(v); |
| 368 | |
| 369 | return v; |
| 370 | } |
| 371 | |
| 372 | // Find a View or make a new one, shifted as required by the file |
| 373 | // offset OFFSET and ALIGNED. |
| 374 | |
| 375 | File_read::View* |
| 376 | File_read::find_or_make_view(off_t offset, off_t start, |
| 377 | section_size_type size, bool aligned, bool cache) |
| 378 | { |
| 379 | unsigned int byteshift; |
| 380 | if (offset == 0) |
| 381 | byteshift = 0; |
| 382 | else |
| 383 | { |
| 384 | unsigned int target_size = (!parameters->target_valid() |
| 385 | ? 64 |
| 386 | : parameters->target().get_size()); |
| 387 | byteshift = offset & ((target_size / 8) - 1); |
| 388 | |
| 389 | // Set BYTESHIFT to the number of dummy bytes which must be |
| 390 | // inserted before the data in order for this data to be |
| 391 | // aligned. |
| 392 | if (byteshift != 0) |
| 393 | byteshift = (target_size / 8) - byteshift; |
| 394 | } |
| 395 | |
| 396 | // Try to find a View with the required BYTESHIFT. |
| 397 | File_read::View* vshifted; |
| 398 | File_read::View* v = this->find_view(offset + start, size, |
| 399 | aligned ? byteshift : -1U, |
| 400 | &vshifted); |
| 401 | if (v != NULL) |
| 402 | { |
| 403 | if (cache) |
| 404 | v->set_cache(); |
| 405 | return v; |
| 406 | } |
| 407 | |
| 408 | // If VSHIFTED is not NULL, then it has the data we need, but with |
| 409 | // the wrong byteshift. |
| 410 | v = vshifted; |
| 411 | if (v != NULL) |
| 412 | { |
| 413 | gold_assert(aligned); |
| 414 | |
| 415 | unsigned char* pbytes = new unsigned char[v->size() + byteshift]; |
| 416 | memset(pbytes, 0, byteshift); |
| 417 | memcpy(pbytes + byteshift, v->data() + v->byteshift(), v->size()); |
| 418 | |
| 419 | File_read::View* shifted_view = new File_read::View(v->start(), v->size(), |
| 420 | pbytes, byteshift, |
| 421 | cache, false); |
| 422 | |
| 423 | this->add_view(shifted_view); |
| 424 | return shifted_view; |
| 425 | } |
| 426 | |
| 427 | // Make a new view. If we don't need an aligned view, use a |
| 428 | // byteshift of 0, so that we can use mmap. |
| 429 | return this->make_view(offset + start, size, |
| 430 | aligned ? byteshift : 0, |
| 431 | cache); |
| 432 | } |
| 433 | |
| 434 | // Get a view into the file. |
| 435 | |
| 436 | const unsigned char* |
| 437 | File_read::get_view(off_t offset, off_t start, section_size_type size, |
| 438 | bool aligned, bool cache) |
| 439 | { |
| 440 | File_read::View* pv = this->find_or_make_view(offset, start, size, |
| 441 | aligned, cache); |
| 442 | return pv->data() + (offset + start - pv->start() + pv->byteshift()); |
| 443 | } |
| 444 | |
| 445 | File_view* |
| 446 | File_read::get_lasting_view(off_t offset, off_t start, section_size_type size, |
| 447 | bool aligned, bool cache) |
| 448 | { |
| 449 | File_read::View* pv = this->find_or_make_view(offset, start, size, |
| 450 | aligned, cache); |
| 451 | pv->lock(); |
| 452 | return new File_view(*this, pv, |
| 453 | (pv->data() |
| 454 | + (offset + start - pv->start() + pv->byteshift()))); |
| 455 | } |
| 456 | |
| 457 | // Use readv to read COUNT entries from RM starting at START. BASE |
| 458 | // must be added to all file offsets in RM. |
| 459 | |
| 460 | void |
| 461 | File_read::do_readv(off_t base, const Read_multiple& rm, size_t start, |
| 462 | size_t count) |
| 463 | { |
| 464 | unsigned char discard[File_read::page_size]; |
| 465 | iovec iov[File_read::max_readv_entries * 2]; |
| 466 | size_t iov_index = 0; |
| 467 | |
| 468 | off_t first_offset = rm[start].file_offset; |
| 469 | off_t last_offset = first_offset; |
| 470 | ssize_t want = 0; |
| 471 | for (size_t i = 0; i < count; ++i) |
| 472 | { |
| 473 | const Read_multiple_entry& i_entry(rm[start + i]); |
| 474 | |
| 475 | if (i_entry.file_offset > last_offset) |
| 476 | { |
| 477 | size_t skip = i_entry.file_offset - last_offset; |
| 478 | gold_assert(skip <= sizeof discard); |
| 479 | |
| 480 | iov[iov_index].iov_base = discard; |
| 481 | iov[iov_index].iov_len = skip; |
| 482 | ++iov_index; |
| 483 | |
| 484 | want += skip; |
| 485 | } |
| 486 | |
| 487 | iov[iov_index].iov_base = i_entry.buffer; |
| 488 | iov[iov_index].iov_len = i_entry.size; |
| 489 | ++iov_index; |
| 490 | |
| 491 | want += i_entry.size; |
| 492 | |
| 493 | last_offset = i_entry.file_offset + i_entry.size; |
| 494 | } |
| 495 | |
| 496 | gold_assert(iov_index < sizeof iov / sizeof iov[0]); |
| 497 | |
| 498 | if (::lseek(this->descriptor_, base + first_offset, SEEK_SET) < 0) |
| 499 | gold_fatal(_("%s: lseek failed: %s"), |
| 500 | this->filename().c_str(), strerror(errno)); |
| 501 | |
| 502 | ssize_t got = ::readv(this->descriptor_, iov, iov_index); |
| 503 | |
| 504 | if (got < 0) |
| 505 | gold_fatal(_("%s: readv failed: %s"), |
| 506 | this->filename().c_str(), strerror(errno)); |
| 507 | if (got != want) |
| 508 | gold_fatal(_("%s: file too short: read only %zd of %zd bytes at %lld"), |
| 509 | this->filename().c_str(), |
| 510 | got, want, static_cast<long long>(base + first_offset)); |
| 511 | } |
| 512 | |
| 513 | // Read several pieces of data from the file. |
| 514 | |
| 515 | void |
| 516 | File_read::read_multiple(off_t base, const Read_multiple& rm) |
| 517 | { |
| 518 | size_t count = rm.size(); |
| 519 | size_t i = 0; |
| 520 | while (i < count) |
| 521 | { |
| 522 | // Find up to MAX_READV_ENTRIES consecutive entries which are |
| 523 | // less than one page apart. |
| 524 | const Read_multiple_entry& i_entry(rm[i]); |
| 525 | off_t i_off = i_entry.file_offset; |
| 526 | off_t end_off = i_off + i_entry.size; |
| 527 | size_t j; |
| 528 | for (j = i + 1; j < count; ++j) |
| 529 | { |
| 530 | if (j - i >= File_read::max_readv_entries) |
| 531 | break; |
| 532 | const Read_multiple_entry& j_entry(rm[j]); |
| 533 | off_t j_off = j_entry.file_offset; |
| 534 | gold_assert(j_off >= end_off); |
| 535 | off_t j_end_off = j_off + j_entry.size; |
| 536 | if (j_end_off - end_off >= File_read::page_size) |
| 537 | break; |
| 538 | end_off = j_end_off; |
| 539 | } |
| 540 | |
| 541 | if (j == i + 1) |
| 542 | this->read(base + i_off, i_entry.size, i_entry.buffer); |
| 543 | else |
| 544 | { |
| 545 | File_read::View* view = this->find_view(base + i_off, |
| 546 | end_off - i_off, |
| 547 | -1U, NULL); |
| 548 | if (view == NULL) |
| 549 | this->do_readv(base, rm, i, j - i); |
| 550 | else |
| 551 | { |
| 552 | const unsigned char* v = (view->data() |
| 553 | + (base + i_off - view->start() |
| 554 | + view->byteshift())); |
| 555 | for (size_t k = i; k < j; ++k) |
| 556 | { |
| 557 | const Read_multiple_entry& k_entry(rm[k]); |
| 558 | gold_assert((convert_to_section_size_type(k_entry.file_offset |
| 559 | - i_off) |
| 560 | + k_entry.size) |
| 561 | <= convert_to_section_size_type(end_off |
| 562 | - i_off)); |
| 563 | memcpy(k_entry.buffer, |
| 564 | v + (k_entry.file_offset - i_off), |
| 565 | k_entry.size); |
| 566 | } |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | i = j; |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | // Mark all views as no longer cached. |
| 575 | |
| 576 | void |
| 577 | File_read::clear_view_cache_marks() |
| 578 | { |
| 579 | // Just ignore this if there are multiple objects associated with |
| 580 | // the file. Otherwise we will wind up uncaching and freeing some |
| 581 | // views for other objects. |
| 582 | if (this->object_count_ > 1) |
| 583 | return; |
| 584 | |
| 585 | for (Views::iterator p = this->views_.begin(); |
| 586 | p != this->views_.end(); |
| 587 | ++p) |
| 588 | p->second->clear_cache(); |
| 589 | for (Saved_views::iterator p = this->saved_views_.begin(); |
| 590 | p != this->saved_views_.end(); |
| 591 | ++p) |
| 592 | (*p)->clear_cache(); |
| 593 | } |
| 594 | |
| 595 | // Remove all the file views. For a file which has multiple |
| 596 | // associated objects (i.e., an archive), we keep accessed views |
| 597 | // around until next time, in the hopes that they will be useful for |
| 598 | // the next object. |
| 599 | |
| 600 | void |
| 601 | File_read::clear_views(bool destroying) |
| 602 | { |
| 603 | Views::iterator p = this->views_.begin(); |
| 604 | while (p != this->views_.end()) |
| 605 | { |
| 606 | bool should_delete; |
| 607 | if (p->second->is_locked()) |
| 608 | should_delete = false; |
| 609 | else if (destroying) |
| 610 | should_delete = true; |
| 611 | else if (p->second->should_cache()) |
| 612 | should_delete = false; |
| 613 | else if (this->object_count_ > 1 && p->second->accessed()) |
| 614 | should_delete = false; |
| 615 | else |
| 616 | should_delete = true; |
| 617 | |
| 618 | if (should_delete) |
| 619 | { |
| 620 | delete p->second; |
| 621 | |
| 622 | // map::erase invalidates only the iterator to the deleted |
| 623 | // element. |
| 624 | Views::iterator pe = p; |
| 625 | ++p; |
| 626 | this->views_.erase(pe); |
| 627 | } |
| 628 | else |
| 629 | { |
| 630 | gold_assert(!destroying); |
| 631 | p->second->clear_accessed(); |
| 632 | ++p; |
| 633 | } |
| 634 | } |
| 635 | |
| 636 | Saved_views::iterator q = this->saved_views_.begin(); |
| 637 | while (q != this->saved_views_.end()) |
| 638 | { |
| 639 | if (!(*q)->is_locked()) |
| 640 | { |
| 641 | delete *q; |
| 642 | q = this->saved_views_.erase(q); |
| 643 | } |
| 644 | else |
| 645 | { |
| 646 | gold_assert(!destroying); |
| 647 | ++q; |
| 648 | } |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | // Print statistical information to stderr. This is used for --stats. |
| 653 | |
| 654 | void |
| 655 | File_read::print_stats() |
| 656 | { |
| 657 | fprintf(stderr, _("%s: total bytes mapped for read: %llu\n"), |
| 658 | program_name, File_read::total_mapped_bytes); |
| 659 | fprintf(stderr, _("%s: maximum bytes mapped for read at one time: %llu\n"), |
| 660 | program_name, File_read::maximum_mapped_bytes); |
| 661 | } |
| 662 | |
| 663 | // Class File_view. |
| 664 | |
| 665 | File_view::~File_view() |
| 666 | { |
| 667 | gold_assert(this->file_.is_locked()); |
| 668 | this->view_->unlock(); |
| 669 | } |
| 670 | |
| 671 | // Class Input_file. |
| 672 | |
| 673 | // Create a file for testing. |
| 674 | |
| 675 | Input_file::Input_file(const Task* task, const char* name, |
| 676 | const unsigned char* contents, off_t size) |
| 677 | : file_() |
| 678 | { |
| 679 | this->input_argument_ = |
| 680 | new Input_file_argument(name, false, "", false, |
| 681 | Position_dependent_options()); |
| 682 | bool ok = file_.open(task, name, contents, size); |
| 683 | gold_assert(ok); |
| 684 | } |
| 685 | |
| 686 | // Return the position dependent options in force for this file. |
| 687 | |
| 688 | const Position_dependent_options& |
| 689 | Input_file::options() const |
| 690 | { |
| 691 | return this->input_argument_->options(); |
| 692 | } |
| 693 | |
| 694 | // Return the name given by the user. For -lc this will return "c". |
| 695 | |
| 696 | const char* |
| 697 | Input_file::name() const |
| 698 | { |
| 699 | return this->input_argument_->name(); |
| 700 | } |
| 701 | |
| 702 | // Return whether we are only reading symbols. |
| 703 | |
| 704 | bool |
| 705 | Input_file::just_symbols() const |
| 706 | { |
| 707 | return this->input_argument_->just_symbols(); |
| 708 | } |
| 709 | |
| 710 | // Open the file. |
| 711 | |
| 712 | // If the filename is not absolute, we assume it is in the current |
| 713 | // directory *except* when: |
| 714 | // A) input_argument_->is_lib() is true; or |
| 715 | // B) input_argument_->extra_search_path() is not empty. |
| 716 | // In both cases, we look in extra_search_path + library_path to find |
| 717 | // the file location, rather than the current directory. |
| 718 | |
| 719 | bool |
| 720 | Input_file::open(const General_options& options, const Dirsearch& dirpath, |
| 721 | const Task* task) |
| 722 | { |
| 723 | std::string name; |
| 724 | |
| 725 | // Case 1: name is an absolute file, just try to open it |
| 726 | // Case 2: name is relative but is_lib is false and extra_search_path |
| 727 | // is empty |
| 728 | if (IS_ABSOLUTE_PATH (this->input_argument_->name()) |
| 729 | || (!this->input_argument_->is_lib() |
| 730 | && this->input_argument_->extra_search_path() == NULL)) |
| 731 | { |
| 732 | name = this->input_argument_->name(); |
| 733 | this->found_name_ = name; |
| 734 | } |
| 735 | // Case 3: is_lib is true |
| 736 | else if (this->input_argument_->is_lib()) |
| 737 | { |
| 738 | // We don't yet support extra_search_path with -l. |
| 739 | gold_assert(this->input_argument_->extra_search_path() == NULL); |
| 740 | std::string n1("lib"); |
| 741 | n1 += this->input_argument_->name(); |
| 742 | std::string n2; |
| 743 | if (options.is_static() |
| 744 | || !this->input_argument_->options().Bdynamic()) |
| 745 | n1 += ".a"; |
| 746 | else |
| 747 | { |
| 748 | n2 = n1 + ".a"; |
| 749 | n1 += ".so"; |
| 750 | } |
| 751 | name = dirpath.find(n1, n2, &this->is_in_sysroot_); |
| 752 | if (name.empty()) |
| 753 | { |
| 754 | gold_error(_("cannot find -l%s"), |
| 755 | this->input_argument_->name()); |
| 756 | return false; |
| 757 | } |
| 758 | if (n2.empty() || name[name.length() - 1] == 'o') |
| 759 | this->found_name_ = n1; |
| 760 | else |
| 761 | this->found_name_ = n2; |
| 762 | } |
| 763 | // Case 4: extra_search_path is not empty |
| 764 | else |
| 765 | { |
| 766 | gold_assert(this->input_argument_->extra_search_path() != NULL); |
| 767 | |
| 768 | // First, check extra_search_path. |
| 769 | name = this->input_argument_->extra_search_path(); |
| 770 | if (!IS_DIR_SEPARATOR (name[name.length() - 1])) |
| 771 | name += '/'; |
| 772 | name += this->input_argument_->name(); |
| 773 | struct stat dummy_stat; |
| 774 | if (::stat(name.c_str(), &dummy_stat) < 0) |
| 775 | { |
| 776 | // extra_search_path failed, so check the normal search-path. |
| 777 | name = dirpath.find(this->input_argument_->name(), "", |
| 778 | &this->is_in_sysroot_); |
| 779 | if (name.empty()) |
| 780 | { |
| 781 | gold_error(_("cannot find %s"), |
| 782 | this->input_argument_->name()); |
| 783 | return false; |
| 784 | } |
| 785 | } |
| 786 | this->found_name_ = this->input_argument_->name(); |
| 787 | } |
| 788 | |
| 789 | // Now that we've figured out where the file lives, try to open it. |
| 790 | |
| 791 | General_options::Object_format format = |
| 792 | this->input_argument_->options().format_enum(); |
| 793 | bool ok; |
| 794 | if (format == General_options::OBJECT_FORMAT_ELF) |
| 795 | ok = this->file_.open(task, name); |
| 796 | else |
| 797 | { |
| 798 | gold_assert(format == General_options::OBJECT_FORMAT_BINARY); |
| 799 | ok = this->open_binary(options, task, name); |
| 800 | } |
| 801 | |
| 802 | if (!ok) |
| 803 | { |
| 804 | gold_error(_("cannot open %s: %s"), |
| 805 | name.c_str(), strerror(errno)); |
| 806 | return false; |
| 807 | } |
| 808 | |
| 809 | return true; |
| 810 | } |
| 811 | |
| 812 | // Open a file for --format binary. |
| 813 | |
| 814 | bool |
| 815 | Input_file::open_binary(const General_options&, |
| 816 | const Task* task, const std::string& name) |
| 817 | { |
| 818 | // In order to open a binary file, we need machine code, size, and |
| 819 | // endianness. We may not have a valid target at this point, in |
| 820 | // which case we use the default target. |
| 821 | const Target* target; |
| 822 | if (parameters->target_valid()) |
| 823 | target = ¶meters->target(); |
| 824 | else |
| 825 | target = ¶meters->default_target(); |
| 826 | |
| 827 | Binary_to_elf binary_to_elf(target->machine_code(), |
| 828 | target->get_size(), |
| 829 | target->is_big_endian(), |
| 830 | name); |
| 831 | if (!binary_to_elf.convert(task)) |
| 832 | return false; |
| 833 | return this->file_.open(task, name, binary_to_elf.converted_data_leak(), |
| 834 | binary_to_elf.converted_size()); |
| 835 | } |
| 836 | |
| 837 | } // End namespace gold. |