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