1 //===-- PathV2.cpp - Implement OS Path Concept ------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the operating system PathV2 API. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/Support/PathV2.h" 15 #include "llvm/Support/Endian.h" 16 #include "llvm/Support/ErrorHandling.h" 17 #include "llvm/Support/FileSystem.h" 18 #include <cctype> 19 #include <cstdio> 20 #include <cstring> 21 22 namespace { 23 using llvm::StringRef; 24 using llvm::sys::path::is_separator; 25 26 #ifdef LLVM_ON_WIN32 27 const char *separators = "\\/"; 28 const char prefered_separator = '\\'; 29 #else 30 const char separators = '/'; 31 const char prefered_separator = '/'; 32 #endif 33 34 StringRef find_first_component(StringRef path) { 35 // Look for this first component in the following order. 36 // * empty (in this case we return an empty string) 37 // * either C: or {//,\\}net. 38 // * {/,\} 39 // * {.,..} 40 // * {file,directory}name 41 42 if (path.empty()) 43 return path; 44 45 #ifdef LLVM_ON_WIN32 46 // C: 47 if (path.size() >= 2 && std::isalpha(static_cast<unsigned char>(path[0])) && 48 path[1] == ':') 49 return path.substr(0, 2); 50 #endif 51 52 // //net 53 if ((path.size() > 2) && 54 is_separator(path[0]) && 55 path[0] == path[1] && 56 !is_separator(path[2])) { 57 // Find the next directory separator. 58 size_t end = path.find_first_of(separators, 2); 59 return path.substr(0, end); 60 } 61 62 // {/,\} 63 if (is_separator(path[0])) 64 return path.substr(0, 1); 65 66 if (path.startswith("..")) 67 return path.substr(0, 2); 68 69 if (path[0] == '.') 70 return path.substr(0, 1); 71 72 // * {file,directory}name 73 size_t end = path.find_first_of(separators, 2); 74 return path.substr(0, end); 75 } 76 77 size_t filename_pos(StringRef str) { 78 if (str.size() == 2 && 79 is_separator(str[0]) && 80 str[0] == str[1]) 81 return 0; 82 83 if (str.size() > 0 && is_separator(str[str.size() - 1])) 84 return str.size() - 1; 85 86 size_t pos = str.find_last_of(separators, str.size() - 1); 87 88 #ifdef LLVM_ON_WIN32 89 if (pos == StringRef::npos) 90 pos = str.find_last_of(':', str.size() - 2); 91 #endif 92 93 if (pos == StringRef::npos || 94 (pos == 1 && is_separator(str[0]))) 95 return 0; 96 97 return pos + 1; 98 } 99 100 size_t root_dir_start(StringRef str) { 101 // case "c:/" 102 #ifdef LLVM_ON_WIN32 103 if (str.size() > 2 && 104 str[1] == ':' && 105 is_separator(str[2])) 106 return 2; 107 #endif 108 109 // case "//" 110 if (str.size() == 2 && 111 is_separator(str[0]) && 112 str[0] == str[1]) 113 return StringRef::npos; 114 115 // case "//net" 116 if (str.size() > 3 && 117 is_separator(str[0]) && 118 str[0] == str[1] && 119 !is_separator(str[2])) { 120 return str.find_first_of(separators, 2); 121 } 122 123 // case "/" 124 if (str.size() > 0 && is_separator(str[0])) 125 return 0; 126 127 return StringRef::npos; 128 } 129 130 size_t parent_path_end(StringRef path) { 131 size_t end_pos = filename_pos(path); 132 133 bool filename_was_sep = path.size() > 0 && is_separator(path[end_pos]); 134 135 // Skip separators except for root dir. 136 size_t root_dir_pos = root_dir_start(path.substr(0, end_pos)); 137 138 while(end_pos > 0 && 139 (end_pos - 1) != root_dir_pos && 140 is_separator(path[end_pos - 1])) 141 --end_pos; 142 143 if (end_pos == 1 && root_dir_pos == 0 && filename_was_sep) 144 return StringRef::npos; 145 146 return end_pos; 147 } 148 } // end unnamed namespace 149 150 namespace llvm { 151 namespace sys { 152 namespace path { 153 154 const_iterator begin(StringRef path) { 155 const_iterator i; 156 i.Path = path; 157 i.Component = find_first_component(path); 158 i.Position = 0; 159 return i; 160 } 161 162 const_iterator end(StringRef path) { 163 const_iterator i; 164 i.Path = path; 165 i.Position = path.size(); 166 return i; 167 } 168 169 const_iterator &const_iterator::operator++() { 170 assert(Position < Path.size() && "Tried to increment past end!"); 171 172 // Increment Position to past the current component 173 Position += Component.size(); 174 175 // Check for end. 176 if (Position == Path.size()) { 177 Component = StringRef(); 178 return *this; 179 } 180 181 // Both POSIX and Windows treat paths that begin with exactly two separators 182 // specially. 183 bool was_net = Component.size() > 2 && 184 is_separator(Component[0]) && 185 Component[1] == Component[0] && 186 !is_separator(Component[2]); 187 188 // Handle separators. 189 if (is_separator(Path[Position])) { 190 // Root dir. 191 if (was_net 192 #ifdef LLVM_ON_WIN32 193 // c:/ 194 || Component.endswith(":") 195 #endif 196 ) { 197 Component = Path.substr(Position, 1); 198 return *this; 199 } 200 201 // Skip extra separators. 202 while (Position != Path.size() && 203 is_separator(Path[Position])) { 204 ++Position; 205 } 206 207 // Treat trailing '/' as a '.'. 208 if (Position == Path.size()) { 209 --Position; 210 Component = "."; 211 return *this; 212 } 213 } 214 215 // Find next component. 216 size_t end_pos = Path.find_first_of(separators, Position); 217 Component = Path.slice(Position, end_pos); 218 219 return *this; 220 } 221 222 const_iterator &const_iterator::operator--() { 223 // If we're at the end and the previous char was a '/', return '.'. 224 if (Position == Path.size() && 225 Path.size() > 1 && 226 is_separator(Path[Position - 1]) 227 #ifdef LLVM_ON_WIN32 228 && Path[Position - 2] != ':' 229 #endif 230 ) { 231 --Position; 232 Component = "."; 233 return *this; 234 } 235 236 // Skip separators unless it's the root directory. 237 size_t root_dir_pos = root_dir_start(Path); 238 size_t end_pos = Position; 239 240 while(end_pos > 0 && 241 (end_pos - 1) != root_dir_pos && 242 is_separator(Path[end_pos - 1])) 243 --end_pos; 244 245 // Find next separator. 246 size_t start_pos = filename_pos(Path.substr(0, end_pos)); 247 Component = Path.slice(start_pos, end_pos); 248 Position = start_pos; 249 return *this; 250 } 251 252 bool const_iterator::operator==(const const_iterator &RHS) const { 253 return Path.begin() == RHS.Path.begin() && 254 Position == RHS.Position; 255 } 256 257 bool const_iterator::operator!=(const const_iterator &RHS) const { 258 return !(*this == RHS); 259 } 260 261 ptrdiff_t const_iterator::operator-(const const_iterator &RHS) const { 262 return Position - RHS.Position; 263 } 264 265 const StringRef root_path(StringRef path) { 266 const_iterator b = begin(path), 267 pos = b, 268 e = end(path); 269 if (b != e) { 270 bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0]; 271 bool has_drive = 272 #ifdef LLVM_ON_WIN32 273 b->endswith(":"); 274 #else 275 false; 276 #endif 277 278 if (has_net || has_drive) { 279 if ((++pos != e) && is_separator((*pos)[0])) { 280 // {C:/,//net/}, so get the first two components. 281 return path.substr(0, b->size() + pos->size()); 282 } else { 283 // just {C:,//net}, return the first component. 284 return *b; 285 } 286 } 287 288 // POSIX style root directory. 289 if (is_separator((*b)[0])) { 290 return *b; 291 } 292 } 293 294 return StringRef(); 295 } 296 297 const StringRef root_name(StringRef path) { 298 const_iterator b = begin(path), 299 e = end(path); 300 if (b != e) { 301 bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0]; 302 bool has_drive = 303 #ifdef LLVM_ON_WIN32 304 b->endswith(":"); 305 #else 306 false; 307 #endif 308 309 if (has_net || has_drive) { 310 // just {C:,//net}, return the first component. 311 return *b; 312 } 313 } 314 315 // No path or no name. 316 return StringRef(); 317 } 318 319 const StringRef root_directory(StringRef path) { 320 const_iterator b = begin(path), 321 pos = b, 322 e = end(path); 323 if (b != e) { 324 bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0]; 325 bool has_drive = 326 #ifdef LLVM_ON_WIN32 327 b->endswith(":"); 328 #else 329 false; 330 #endif 331 332 if ((has_net || has_drive) && 333 // {C:,//net}, skip to the next component. 334 (++pos != e) && is_separator((*pos)[0])) { 335 return *pos; 336 } 337 338 // POSIX style root directory. 339 if (!has_net && is_separator((*b)[0])) { 340 return *b; 341 } 342 } 343 344 // No path or no root. 345 return StringRef(); 346 } 347 348 const StringRef relative_path(StringRef path) { 349 StringRef root = root_path(path); 350 return path.substr(root.size()); 351 } 352 353 void append(SmallVectorImpl<char> &path, const Twine &a, 354 const Twine &b, 355 const Twine &c, 356 const Twine &d) { 357 SmallString<32> a_storage; 358 SmallString<32> b_storage; 359 SmallString<32> c_storage; 360 SmallString<32> d_storage; 361 362 SmallVector<StringRef, 4> components; 363 if (!a.isTriviallyEmpty()) components.push_back(a.toStringRef(a_storage)); 364 if (!b.isTriviallyEmpty()) components.push_back(b.toStringRef(b_storage)); 365 if (!c.isTriviallyEmpty()) components.push_back(c.toStringRef(c_storage)); 366 if (!d.isTriviallyEmpty()) components.push_back(d.toStringRef(d_storage)); 367 368 for (SmallVectorImpl<StringRef>::const_iterator i = components.begin(), 369 e = components.end(); 370 i != e; ++i) { 371 bool path_has_sep = !path.empty() && is_separator(path[path.size() - 1]); 372 bool component_has_sep = !i->empty() && is_separator((*i)[0]); 373 bool is_root_name = has_root_name(*i); 374 375 if (path_has_sep) { 376 // Strip separators from beginning of component. 377 size_t loc = i->find_first_not_of(separators); 378 StringRef c = i->substr(loc); 379 380 // Append it. 381 path.append(c.begin(), c.end()); 382 continue; 383 } 384 385 if (!component_has_sep && !(path.empty() || is_root_name)) { 386 // Add a separator. 387 path.push_back(prefered_separator); 388 } 389 390 path.append(i->begin(), i->end()); 391 } 392 } 393 394 void append(SmallVectorImpl<char> &path, 395 const_iterator begin, const_iterator end) { 396 for (; begin != end; ++begin) 397 path::append(path, *begin); 398 } 399 400 const StringRef parent_path(StringRef path) { 401 size_t end_pos = parent_path_end(path); 402 if (end_pos == StringRef::npos) 403 return StringRef(); 404 else 405 return path.substr(0, end_pos); 406 } 407 408 void remove_filename(SmallVectorImpl<char> &path) { 409 size_t end_pos = parent_path_end(StringRef(path.begin(), path.size())); 410 if (end_pos != StringRef::npos) 411 path.set_size(end_pos); 412 } 413 414 void replace_extension(SmallVectorImpl<char> &path, const Twine &extension) { 415 StringRef p(path.begin(), path.size()); 416 SmallString<32> ext_storage; 417 StringRef ext = extension.toStringRef(ext_storage); 418 419 // Erase existing extension. 420 size_t pos = p.find_last_of('.'); 421 if (pos != StringRef::npos && pos >= filename_pos(p)) 422 path.set_size(pos); 423 424 // Append '.' if needed. 425 if (ext.size() > 0 && ext[0] != '.') 426 path.push_back('.'); 427 428 // Append extension. 429 path.append(ext.begin(), ext.end()); 430 } 431 432 void native(const Twine &path, SmallVectorImpl<char> &result) { 433 // Clear result. 434 result.clear(); 435 #ifdef LLVM_ON_WIN32 436 SmallString<128> path_storage; 437 StringRef p = path.toStringRef(path_storage); 438 result.reserve(p.size()); 439 for (StringRef::const_iterator i = p.begin(), 440 e = p.end(); 441 i != e; 442 ++i) { 443 if (*i == '/') 444 result.push_back('\\'); 445 else 446 result.push_back(*i); 447 } 448 #else 449 path.toVector(result); 450 #endif 451 } 452 453 const StringRef filename(StringRef path) { 454 return *(--end(path)); 455 } 456 457 const StringRef stem(StringRef path) { 458 StringRef fname = filename(path); 459 size_t pos = fname.find_last_of('.'); 460 if (pos == StringRef::npos) 461 return fname; 462 else 463 if ((fname.size() == 1 && fname == ".") || 464 (fname.size() == 2 && fname == "..")) 465 return fname; 466 else 467 return fname.substr(0, pos); 468 } 469 470 const StringRef extension(StringRef path) { 471 StringRef fname = filename(path); 472 size_t pos = fname.find_last_of('.'); 473 if (pos == StringRef::npos) 474 return StringRef(); 475 else 476 if ((fname.size() == 1 && fname == ".") || 477 (fname.size() == 2 && fname == "..")) 478 return StringRef(); 479 else 480 return fname.substr(pos); 481 } 482 483 bool is_separator(char value) { 484 switch(value) { 485 #ifdef LLVM_ON_WIN32 486 case '\\': // fall through 487 #endif 488 case '/': return true; 489 default: return false; 490 } 491 } 492 493 void system_temp_directory(bool erasedOnReboot, SmallVectorImpl<char> &result) { 494 result.clear(); 495 496 // Check whether the temporary directory is specified by an environment 497 // variable. 498 const char *EnvironmentVariable; 499 #ifdef LLVM_ON_WIN32 500 EnvironmentVariable = "TEMP"; 501 #else 502 EnvironmentVariable = "TMPDIR"; 503 #endif 504 if (char *RequestedDir = getenv(EnvironmentVariable)) { 505 result.append(RequestedDir, RequestedDir + strlen(RequestedDir)); 506 return; 507 } 508 509 // Fall back to a system default. 510 const char *DefaultResult; 511 #ifdef LLVM_ON_WIN32 512 (void)erasedOnReboot; 513 DefaultResult = "C:\\TEMP"; 514 #else 515 if (erasedOnReboot) 516 DefaultResult = "/tmp"; 517 else 518 DefaultResult = "/var/tmp"; 519 #endif 520 result.append(DefaultResult, DefaultResult + strlen(DefaultResult)); 521 } 522 523 bool has_root_name(const Twine &path) { 524 SmallString<128> path_storage; 525 StringRef p = path.toStringRef(path_storage); 526 527 return !root_name(p).empty(); 528 } 529 530 bool has_root_directory(const Twine &path) { 531 SmallString<128> path_storage; 532 StringRef p = path.toStringRef(path_storage); 533 534 return !root_directory(p).empty(); 535 } 536 537 bool has_root_path(const Twine &path) { 538 SmallString<128> path_storage; 539 StringRef p = path.toStringRef(path_storage); 540 541 return !root_path(p).empty(); 542 } 543 544 bool has_relative_path(const Twine &path) { 545 SmallString<128> path_storage; 546 StringRef p = path.toStringRef(path_storage); 547 548 return !relative_path(p).empty(); 549 } 550 551 bool has_filename(const Twine &path) { 552 SmallString<128> path_storage; 553 StringRef p = path.toStringRef(path_storage); 554 555 return !filename(p).empty(); 556 } 557 558 bool has_parent_path(const Twine &path) { 559 SmallString<128> path_storage; 560 StringRef p = path.toStringRef(path_storage); 561 562 return !parent_path(p).empty(); 563 } 564 565 bool has_stem(const Twine &path) { 566 SmallString<128> path_storage; 567 StringRef p = path.toStringRef(path_storage); 568 569 return !stem(p).empty(); 570 } 571 572 bool has_extension(const Twine &path) { 573 SmallString<128> path_storage; 574 StringRef p = path.toStringRef(path_storage); 575 576 return !extension(p).empty(); 577 } 578 579 bool is_absolute(const Twine &path) { 580 SmallString<128> path_storage; 581 StringRef p = path.toStringRef(path_storage); 582 583 bool rootDir = has_root_directory(p), 584 #ifdef LLVM_ON_WIN32 585 rootName = has_root_name(p); 586 #else 587 rootName = true; 588 #endif 589 590 return rootDir && rootName; 591 } 592 593 bool is_relative(const Twine &path) { 594 return !is_absolute(path); 595 } 596 597 } // end namespace path 598 599 namespace fs { 600 601 error_code make_absolute(SmallVectorImpl<char> &path) { 602 StringRef p(path.data(), path.size()); 603 604 bool rootDirectory = path::has_root_directory(p), 605 #ifdef LLVM_ON_WIN32 606 rootName = path::has_root_name(p); 607 #else 608 rootName = true; 609 #endif 610 611 // Already absolute. 612 if (rootName && rootDirectory) 613 return error_code::success(); 614 615 // All of the following conditions will need the current directory. 616 SmallString<128> current_dir; 617 if (error_code ec = current_path(current_dir)) return ec; 618 619 // Relative path. Prepend the current directory. 620 if (!rootName && !rootDirectory) { 621 // Append path to the current directory. 622 path::append(current_dir, p); 623 // Set path to the result. 624 path.swap(current_dir); 625 return error_code::success(); 626 } 627 628 if (!rootName && rootDirectory) { 629 StringRef cdrn = path::root_name(current_dir); 630 SmallString<128> curDirRootName(cdrn.begin(), cdrn.end()); 631 path::append(curDirRootName, p); 632 // Set path to the result. 633 path.swap(curDirRootName); 634 return error_code::success(); 635 } 636 637 if (rootName && !rootDirectory) { 638 StringRef pRootName = path::root_name(p); 639 StringRef bRootDirectory = path::root_directory(current_dir); 640 StringRef bRelativePath = path::relative_path(current_dir); 641 StringRef pRelativePath = path::relative_path(p); 642 643 SmallString<128> res; 644 path::append(res, pRootName, bRootDirectory, bRelativePath, pRelativePath); 645 path.swap(res); 646 return error_code::success(); 647 } 648 649 llvm_unreachable("All rootName and rootDirectory combinations should have " 650 "occurred above!"); 651 } 652 653 error_code create_directories(const Twine &path, bool &existed) { 654 SmallString<128> path_storage; 655 StringRef p = path.toStringRef(path_storage); 656 657 StringRef parent = path::parent_path(p); 658 if (!parent.empty()) { 659 bool parent_exists; 660 if (error_code ec = fs::exists(parent, parent_exists)) return ec; 661 662 if (!parent_exists) 663 if (error_code ec = create_directories(parent, existed)) return ec; 664 } 665 666 return create_directory(p, existed); 667 } 668 669 bool exists(file_status status) { 670 return status_known(status) && status.type() != file_type::file_not_found; 671 } 672 673 bool status_known(file_status s) { 674 return s.type() != file_type::status_error; 675 } 676 677 bool is_directory(file_status status) { 678 return status.type() == file_type::directory_file; 679 } 680 681 error_code is_directory(const Twine &path, bool &result) { 682 file_status st; 683 if (error_code ec = status(path, st)) 684 return ec; 685 result = is_directory(st); 686 return error_code::success(); 687 } 688 689 bool is_regular_file(file_status status) { 690 return status.type() == file_type::regular_file; 691 } 692 693 error_code is_regular_file(const Twine &path, bool &result) { 694 file_status st; 695 if (error_code ec = status(path, st)) 696 return ec; 697 result = is_regular_file(st); 698 return error_code::success(); 699 } 700 701 bool is_symlink(file_status status) { 702 return status.type() == file_type::symlink_file; 703 } 704 705 error_code is_symlink(const Twine &path, bool &result) { 706 file_status st; 707 if (error_code ec = status(path, st)) 708 return ec; 709 result = is_symlink(st); 710 return error_code::success(); 711 } 712 713 bool is_other(file_status status) { 714 return exists(status) && 715 !is_regular_file(status) && 716 !is_directory(status) && 717 !is_symlink(status); 718 } 719 720 void directory_entry::replace_filename(const Twine &filename, file_status st) { 721 SmallString<128> path(Path.begin(), Path.end()); 722 path::remove_filename(path); 723 path::append(path, filename); 724 Path = path.str(); 725 Status = st; 726 } 727 728 error_code has_magic(const Twine &path, const Twine &magic, bool &result) { 729 SmallString<32> MagicStorage; 730 StringRef Magic = magic.toStringRef(MagicStorage); 731 SmallString<32> Buffer; 732 733 if (error_code ec = get_magic(path, Magic.size(), Buffer)) { 734 if (ec == errc::value_too_large) { 735 // Magic.size() > file_size(Path). 736 result = false; 737 return error_code::success(); 738 } 739 return ec; 740 } 741 742 result = Magic == Buffer; 743 return error_code::success(); 744 } 745 746 /// @brief Identify the magic in magic. 747 file_magic identify_magic(StringRef magic) { 748 if (magic.size() < 4) 749 return file_magic::unknown; 750 switch ((unsigned char)magic[0]) { 751 case 0xDE: // 0x0B17C0DE = BC wraper 752 if (magic[1] == (char)0xC0 && magic[2] == (char)0x17 && 753 magic[3] == (char)0x0B) 754 return file_magic::bitcode; 755 break; 756 case 'B': 757 if (magic[1] == 'C' && magic[2] == (char)0xC0 && magic[3] == (char)0xDE) 758 return file_magic::bitcode; 759 break; 760 case '!': 761 if (magic.size() >= 8) 762 if (memcmp(magic.data(),"!<arch>\n",8) == 0) 763 return file_magic::archive; 764 break; 765 766 case '\177': 767 if (magic[1] == 'E' && magic[2] == 'L' && magic[3] == 'F') { 768 if (magic.size() >= 18 && magic[17] == 0) 769 switch (magic[16]) { 770 default: break; 771 case 1: return file_magic::elf_relocatable; 772 case 2: return file_magic::elf_executable; 773 case 3: return file_magic::elf_shared_object; 774 case 4: return file_magic::elf_core; 775 } 776 } 777 break; 778 779 case 0xCA: 780 if (magic[1] == char(0xFE) && magic[2] == char(0xBA) && 781 magic[3] == char(0xBE)) { 782 // This is complicated by an overlap with Java class files. 783 // See the Mach-O section in /usr/share/file/magic for details. 784 if (magic.size() >= 8 && magic[7] < 43) 785 // FIXME: Universal Binary of any type. 786 return file_magic::macho_dynamically_linked_shared_lib; 787 } 788 break; 789 790 // The two magic numbers for mach-o are: 791 // 0xfeedface - 32-bit mach-o 792 // 0xfeedfacf - 64-bit mach-o 793 case 0xFE: 794 case 0xCE: 795 case 0xCF: { 796 uint16_t type = 0; 797 if (magic[0] == char(0xFE) && magic[1] == char(0xED) && 798 magic[2] == char(0xFA) && 799 (magic[3] == char(0xCE) || magic[3] == char(0xCF))) { 800 /* Native endian */ 801 if (magic.size() >= 16) type = magic[14] << 8 | magic[15]; 802 } else if ((magic[0] == char(0xCE) || magic[0] == char(0xCF)) && 803 magic[1] == char(0xFA) && magic[2] == char(0xED) && 804 magic[3] == char(0xFE)) { 805 /* Reverse endian */ 806 if (magic.size() >= 14) type = magic[13] << 8 | magic[12]; 807 } 808 switch (type) { 809 default: break; 810 case 1: return file_magic::macho_object; 811 case 2: return file_magic::macho_executable; 812 case 3: return file_magic::macho_fixed_virtual_memory_shared_lib; 813 case 4: return file_magic::macho_core; 814 case 5: return file_magic::macho_preload_executabl; 815 case 6: return file_magic::macho_dynamically_linked_shared_lib; 816 case 7: return file_magic::macho_dynamic_linker; 817 case 8: return file_magic::macho_bundle; 818 case 9: return file_magic::macho_dynamic_linker; 819 case 10: return file_magic::macho_dsym_companion; 820 } 821 break; 822 } 823 case 0xF0: // PowerPC Windows 824 case 0x83: // Alpha 32-bit 825 case 0x84: // Alpha 64-bit 826 case 0x66: // MPS R4000 Windows 827 case 0x50: // mc68K 828 case 0x4c: // 80386 Windows 829 if (magic[1] == 0x01) 830 return file_magic::coff_object; 831 832 case 0x90: // PA-RISC Windows 833 case 0x68: // mc68K Windows 834 if (magic[1] == 0x02) 835 return file_magic::coff_object; 836 break; 837 838 case 0x4d: // Possible MS-DOS stub on Windows PE file 839 if (magic[1] == 0x5a) { 840 uint32_t off = 841 *reinterpret_cast<const support::ulittle32_t*>(magic.data() + 0x3c); 842 // PE/COFF file, either EXE or DLL. 843 if (off < magic.size() && memcmp(magic.data() + off, "PE\0\0",4) == 0) 844 return file_magic::pecoff_executable; 845 } 846 break; 847 848 case 0x64: // x86-64 Windows. 849 if (magic[1] == char(0x86)) 850 return file_magic::coff_object; 851 break; 852 853 default: 854 break; 855 } 856 return file_magic::unknown; 857 } 858 859 error_code identify_magic(const Twine &path, file_magic &result) { 860 SmallString<32> Magic; 861 error_code ec = get_magic(path, Magic.capacity(), Magic); 862 if (ec && ec != errc::value_too_large) 863 return ec; 864 865 result = identify_magic(Magic); 866 return error_code::success(); 867 } 868 869 namespace { 870 error_code remove_all_r(StringRef path, file_type ft, uint32_t &count) { 871 if (ft == file_type::directory_file) { 872 // This code would be a lot better with exceptions ;/. 873 error_code ec; 874 directory_iterator i(path, ec); 875 if (ec) return ec; 876 for (directory_iterator e; i != e; i.increment(ec)) { 877 if (ec) return ec; 878 file_status st; 879 if (error_code ec = i->status(st)) return ec; 880 if (error_code ec = remove_all_r(i->path(), st.type(), count)) return ec; 881 } 882 bool obviously_this_exists; 883 if (error_code ec = remove(path, obviously_this_exists)) return ec; 884 assert(obviously_this_exists); 885 ++count; // Include the directory itself in the items removed. 886 } else { 887 bool obviously_this_exists; 888 if (error_code ec = remove(path, obviously_this_exists)) return ec; 889 assert(obviously_this_exists); 890 ++count; 891 } 892 893 return error_code::success(); 894 } 895 } // end unnamed namespace 896 897 error_code remove_all(const Twine &path, uint32_t &num_removed) { 898 SmallString<128> path_storage; 899 StringRef p = path.toStringRef(path_storage); 900 901 file_status fs; 902 if (error_code ec = status(path, fs)) 903 return ec; 904 num_removed = 0; 905 return remove_all_r(p, fs.type(), num_removed); 906 } 907 908 error_code directory_entry::status(file_status &result) const { 909 return fs::status(Path, result); 910 } 911 912 } // end namespace fs 913 } // end namespace sys 914 } // end namespace llvm 915 916 // Include the truly platform-specific parts. 917 #if defined(LLVM_ON_UNIX) 918 #include "Unix/PathV2.inc" 919 #endif 920 #if defined(LLVM_ON_WIN32) 921 #include "Windows/PathV2.inc" 922 #endif 923