1 //===-- Path.cpp - Implement OS Path Concept ------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the operating system Path API.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Support/Errc.h"
15 #include "llvm/Support/Path.h"
16 #include "llvm/Support/Endian.h"
17 #include "llvm/Support/ErrorHandling.h"
18 #include "llvm/Support/FileSystem.h"
19 #include "llvm/Support/Process.h"
25 #if !defined(_MSC_VER) && !defined(__MINGW32__)
34 using llvm::StringRef;
35 using llvm::sys::path::is_separator;
38 const char *separators = "\\/";
39 const char preferred_separator = '\\';
41 const char separators = '/';
42 const char preferred_separator = '/';
45 StringRef find_first_component(StringRef path) {
46 // Look for this first component in the following order.
47 // * empty (in this case we return an empty string)
48 // * either C: or {//,\\}net.
51 // * {file,directory}name
58 if (path.size() >= 2 && std::isalpha(static_cast<unsigned char>(path[0])) &&
60 return path.substr(0, 2);
64 if ((path.size() > 2) &&
65 is_separator(path[0]) &&
67 !is_separator(path[2])) {
68 // Find the next directory separator.
69 size_t end = path.find_first_of(separators, 2);
70 return path.substr(0, end);
74 if (is_separator(path[0]))
75 return path.substr(0, 1);
77 if (path.startswith(".."))
78 return path.substr(0, 2);
81 return path.substr(0, 1);
83 // * {file,directory}name
84 size_t end = path.find_first_of(separators);
85 return path.substr(0, end);
88 size_t filename_pos(StringRef str) {
89 if (str.size() == 2 &&
90 is_separator(str[0]) &&
94 if (str.size() > 0 && is_separator(str[str.size() - 1]))
95 return str.size() - 1;
97 size_t pos = str.find_last_of(separators, str.size() - 1);
100 if (pos == StringRef::npos)
101 pos = str.find_last_of(':', str.size() - 2);
104 if (pos == StringRef::npos ||
105 (pos == 1 && is_separator(str[0])))
111 size_t root_dir_start(StringRef str) {
114 if (str.size() > 2 &&
116 is_separator(str[2]))
121 if (str.size() == 2 &&
122 is_separator(str[0]) &&
124 return StringRef::npos;
127 if (str.size() > 3 &&
128 is_separator(str[0]) &&
130 !is_separator(str[2])) {
131 return str.find_first_of(separators, 2);
135 if (str.size() > 0 && is_separator(str[0]))
138 return StringRef::npos;
141 size_t parent_path_end(StringRef path) {
142 size_t end_pos = filename_pos(path);
144 bool filename_was_sep = path.size() > 0 && is_separator(path[end_pos]);
146 // Skip separators except for root dir.
147 size_t root_dir_pos = root_dir_start(path.substr(0, end_pos));
150 (end_pos - 1) != root_dir_pos &&
151 is_separator(path[end_pos - 1]))
154 if (end_pos == 1 && root_dir_pos == 0 && filename_was_sep)
155 return StringRef::npos;
159 } // end unnamed namespace
167 // Implemented in Unix/Path.inc and Windows/Path.inc.
168 static std::error_code TempDir(SmallVectorImpl<char> &result);
170 static std::error_code createUniqueEntity(const Twine &Model, int &ResultFD,
171 SmallVectorImpl<char> &ResultPath,
172 bool MakeAbsolute, unsigned Mode,
174 SmallString<128> ModelStorage;
175 Model.toVector(ModelStorage);
178 // Make model absolute by prepending a temp directory if it's not already.
179 if (!sys::path::is_absolute(Twine(ModelStorage))) {
180 SmallString<128> TDir;
181 if (std::error_code EC = TempDir(TDir))
183 sys::path::append(TDir, Twine(ModelStorage));
184 ModelStorage.swap(TDir);
188 // From here on, DO NOT modify model. It may be needed if the randomly chosen
189 // path already exists.
190 ResultPath = ModelStorage;
192 ResultPath.push_back(0);
193 ResultPath.pop_back();
196 // Replace '%' with random chars.
197 for (unsigned i = 0, e = ModelStorage.size(); i != e; ++i) {
198 if (ModelStorage[i] == '%')
199 ResultPath[i] = "0123456789abcdef"[sys::Process::GetRandomNumber() & 15];
202 // Try to open + create the file.
205 if (std::error_code EC =
206 sys::fs::openFileForWrite(Twine(ResultPath.begin()), ResultFD,
207 sys::fs::F_RW | sys::fs::F_Excl, Mode)) {
208 if (EC == errc::file_exists)
209 goto retry_random_path;
213 return std::error_code();
218 std::error_code EC = sys::fs::exists(ResultPath.begin(), Exists);
222 goto retry_random_path;
223 return std::error_code();
227 if (std::error_code EC =
228 sys::fs::create_directory(ResultPath.begin(), false)) {
229 if (EC == errc::file_exists)
230 goto retry_random_path;
233 return std::error_code();
236 llvm_unreachable("Invalid Type");
243 const_iterator begin(StringRef path) {
246 i.Component = find_first_component(path);
251 const_iterator end(StringRef path) {
254 i.Position = path.size();
258 const_iterator &const_iterator::operator++() {
259 assert(Position < Path.size() && "Tried to increment past end!");
261 // Increment Position to past the current component
262 Position += Component.size();
265 if (Position == Path.size()) {
266 Component = StringRef();
270 // Both POSIX and Windows treat paths that begin with exactly two separators
272 bool was_net = Component.size() > 2 &&
273 is_separator(Component[0]) &&
274 Component[1] == Component[0] &&
275 !is_separator(Component[2]);
277 // Handle separators.
278 if (is_separator(Path[Position])) {
283 || Component.endswith(":")
286 Component = Path.substr(Position, 1);
290 // Skip extra separators.
291 while (Position != Path.size() &&
292 is_separator(Path[Position])) {
296 // Treat trailing '/' as a '.'.
297 if (Position == Path.size()) {
304 // Find next component.
305 size_t end_pos = Path.find_first_of(separators, Position);
306 Component = Path.slice(Position, end_pos);
311 bool const_iterator::operator==(const const_iterator &RHS) const {
312 return Path.begin() == RHS.Path.begin() && Position == RHS.Position;
315 ptrdiff_t const_iterator::operator-(const const_iterator &RHS) const {
316 return Position - RHS.Position;
319 reverse_iterator rbegin(StringRef Path) {
322 I.Position = Path.size();
326 reverse_iterator rend(StringRef Path) {
329 I.Component = Path.substr(0, 0);
334 reverse_iterator &reverse_iterator::operator++() {
335 // If we're at the end and the previous char was a '/', return '.' unless
336 // we are the root path.
337 size_t root_dir_pos = root_dir_start(Path);
338 if (Position == Path.size() &&
339 Path.size() > root_dir_pos + 1 &&
340 is_separator(Path[Position - 1])) {
346 // Skip separators unless it's the root directory.
347 size_t end_pos = Position;
350 (end_pos - 1) != root_dir_pos &&
351 is_separator(Path[end_pos - 1]))
354 // Find next separator.
355 size_t start_pos = filename_pos(Path.substr(0, end_pos));
356 Component = Path.slice(start_pos, end_pos);
357 Position = start_pos;
361 bool reverse_iterator::operator==(const reverse_iterator &RHS) const {
362 return Path.begin() == RHS.Path.begin() && Component == RHS.Component &&
363 Position == RHS.Position;
366 const StringRef root_path(StringRef path) {
367 const_iterator b = begin(path),
371 bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0];
379 if (has_net || has_drive) {
380 if ((++pos != e) && is_separator((*pos)[0])) {
381 // {C:/,//net/}, so get the first two components.
382 return path.substr(0, b->size() + pos->size());
384 // just {C:,//net}, return the first component.
389 // POSIX style root directory.
390 if (is_separator((*b)[0])) {
398 const StringRef root_name(StringRef path) {
399 const_iterator b = begin(path),
402 bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0];
410 if (has_net || has_drive) {
411 // just {C:,//net}, return the first component.
416 // No path or no name.
420 const StringRef root_directory(StringRef path) {
421 const_iterator b = begin(path),
425 bool has_net = b->size() > 2 && is_separator((*b)[0]) && (*b)[1] == (*b)[0];
433 if ((has_net || has_drive) &&
434 // {C:,//net}, skip to the next component.
435 (++pos != e) && is_separator((*pos)[0])) {
439 // POSIX style root directory.
440 if (!has_net && is_separator((*b)[0])) {
445 // No path or no root.
449 const StringRef relative_path(StringRef path) {
450 StringRef root = root_path(path);
451 return path.substr(root.size());
454 void append(SmallVectorImpl<char> &path, const Twine &a,
458 SmallString<32> a_storage;
459 SmallString<32> b_storage;
460 SmallString<32> c_storage;
461 SmallString<32> d_storage;
463 SmallVector<StringRef, 4> components;
464 if (!a.isTriviallyEmpty()) components.push_back(a.toStringRef(a_storage));
465 if (!b.isTriviallyEmpty()) components.push_back(b.toStringRef(b_storage));
466 if (!c.isTriviallyEmpty()) components.push_back(c.toStringRef(c_storage));
467 if (!d.isTriviallyEmpty()) components.push_back(d.toStringRef(d_storage));
469 for (SmallVectorImpl<StringRef>::const_iterator i = components.begin(),
470 e = components.end();
472 bool path_has_sep = !path.empty() && is_separator(path[path.size() - 1]);
473 bool component_has_sep = !i->empty() && is_separator((*i)[0]);
474 bool is_root_name = has_root_name(*i);
477 // Strip separators from beginning of component.
478 size_t loc = i->find_first_not_of(separators);
479 StringRef c = i->substr(loc);
482 path.append(c.begin(), c.end());
486 if (!component_has_sep && !(path.empty() || is_root_name)) {
488 path.push_back(preferred_separator);
491 path.append(i->begin(), i->end());
495 void append(SmallVectorImpl<char> &path,
496 const_iterator begin, const_iterator end) {
497 for (; begin != end; ++begin)
498 path::append(path, *begin);
501 const StringRef parent_path(StringRef path) {
502 size_t end_pos = parent_path_end(path);
503 if (end_pos == StringRef::npos)
506 return path.substr(0, end_pos);
509 void remove_filename(SmallVectorImpl<char> &path) {
510 size_t end_pos = parent_path_end(StringRef(path.begin(), path.size()));
511 if (end_pos != StringRef::npos)
512 path.set_size(end_pos);
515 void replace_extension(SmallVectorImpl<char> &path, const Twine &extension) {
516 StringRef p(path.begin(), path.size());
517 SmallString<32> ext_storage;
518 StringRef ext = extension.toStringRef(ext_storage);
520 // Erase existing extension.
521 size_t pos = p.find_last_of('.');
522 if (pos != StringRef::npos && pos >= filename_pos(p))
525 // Append '.' if needed.
526 if (ext.size() > 0 && ext[0] != '.')
530 path.append(ext.begin(), ext.end());
533 void native(const Twine &path, SmallVectorImpl<char> &result) {
534 assert((!path.isSingleStringRef() ||
535 path.getSingleStringRef().data() != result.data()) &&
536 "path and result are not allowed to overlap!");
539 path.toVector(result);
543 void native(SmallVectorImpl<char> &path) {
545 std::replace(path.begin(), path.end(), '/', '\\');
549 const StringRef filename(StringRef path) {
550 return *rbegin(path);
553 const StringRef stem(StringRef path) {
554 StringRef fname = filename(path);
555 size_t pos = fname.find_last_of('.');
556 if (pos == StringRef::npos)
559 if ((fname.size() == 1 && fname == ".") ||
560 (fname.size() == 2 && fname == ".."))
563 return fname.substr(0, pos);
566 const StringRef extension(StringRef path) {
567 StringRef fname = filename(path);
568 size_t pos = fname.find_last_of('.');
569 if (pos == StringRef::npos)
572 if ((fname.size() == 1 && fname == ".") ||
573 (fname.size() == 2 && fname == ".."))
576 return fname.substr(pos);
579 bool is_separator(char value) {
582 case '\\': // fall through
584 case '/': return true;
585 default: return false;
589 static const char preferred_separator_string[] = { preferred_separator, '\0' };
591 const StringRef get_separator() {
592 return preferred_separator_string;
595 void system_temp_directory(bool erasedOnReboot, SmallVectorImpl<char> &result) {
598 #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
599 // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
600 // macros defined in <unistd.h> on darwin >= 9
601 int ConfName = erasedOnReboot? _CS_DARWIN_USER_TEMP_DIR
602 : _CS_DARWIN_USER_CACHE_DIR;
603 size_t ConfLen = confstr(ConfName, nullptr, 0);
606 result.resize(ConfLen);
607 ConfLen = confstr(ConfName, result.data(), result.size());
608 } while (ConfLen > 0 && ConfLen != result.size());
611 assert(result.back() == 0);
620 // Check whether the temporary directory is specified by an environment
622 const char *EnvironmentVariable;
624 EnvironmentVariable = "TEMP";
626 EnvironmentVariable = "TMPDIR";
628 if (char *RequestedDir = getenv(EnvironmentVariable)) {
629 result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
633 // Fall back to a system default.
634 const char *DefaultResult;
636 (void)erasedOnReboot;
637 DefaultResult = "C:\\TEMP";
640 DefaultResult = "/tmp";
642 DefaultResult = "/var/tmp";
644 result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
647 bool has_root_name(const Twine &path) {
648 SmallString<128> path_storage;
649 StringRef p = path.toStringRef(path_storage);
651 return !root_name(p).empty();
654 bool has_root_directory(const Twine &path) {
655 SmallString<128> path_storage;
656 StringRef p = path.toStringRef(path_storage);
658 return !root_directory(p).empty();
661 bool has_root_path(const Twine &path) {
662 SmallString<128> path_storage;
663 StringRef p = path.toStringRef(path_storage);
665 return !root_path(p).empty();
668 bool has_relative_path(const Twine &path) {
669 SmallString<128> path_storage;
670 StringRef p = path.toStringRef(path_storage);
672 return !relative_path(p).empty();
675 bool has_filename(const Twine &path) {
676 SmallString<128> path_storage;
677 StringRef p = path.toStringRef(path_storage);
679 return !filename(p).empty();
682 bool has_parent_path(const Twine &path) {
683 SmallString<128> path_storage;
684 StringRef p = path.toStringRef(path_storage);
686 return !parent_path(p).empty();
689 bool has_stem(const Twine &path) {
690 SmallString<128> path_storage;
691 StringRef p = path.toStringRef(path_storage);
693 return !stem(p).empty();
696 bool has_extension(const Twine &path) {
697 SmallString<128> path_storage;
698 StringRef p = path.toStringRef(path_storage);
700 return !extension(p).empty();
703 bool is_absolute(const Twine &path) {
704 SmallString<128> path_storage;
705 StringRef p = path.toStringRef(path_storage);
707 bool rootDir = has_root_directory(p),
709 rootName = has_root_name(p);
714 return rootDir && rootName;
717 bool is_relative(const Twine &path) {
718 return !is_absolute(path);
721 } // end namespace path
725 std::error_code getUniqueID(const Twine Path, UniqueID &Result) {
727 std::error_code EC = status(Path, Status);
730 Result = Status.getUniqueID();
731 return std::error_code();
734 std::error_code createUniqueFile(const Twine &Model, int &ResultFd,
735 SmallVectorImpl<char> &ResultPath,
737 return createUniqueEntity(Model, ResultFd, ResultPath, false, Mode, FS_File);
740 std::error_code createUniqueFile(const Twine &Model,
741 SmallVectorImpl<char> &ResultPath) {
743 return createUniqueEntity(Model, Dummy, ResultPath, false, 0, FS_Name);
746 static std::error_code
747 createTemporaryFile(const Twine &Model, int &ResultFD,
748 llvm::SmallVectorImpl<char> &ResultPath, FSEntity Type) {
749 SmallString<128> Storage;
750 StringRef P = Model.toNullTerminatedStringRef(Storage);
751 assert(P.find_first_of(separators) == StringRef::npos &&
752 "Model must be a simple filename.");
753 // Use P.begin() so that createUniqueEntity doesn't need to recreate Storage.
754 return createUniqueEntity(P.begin(), ResultFD, ResultPath,
755 true, owner_read | owner_write, Type);
758 static std::error_code
759 createTemporaryFile(const Twine &Prefix, StringRef Suffix, int &ResultFD,
760 llvm::SmallVectorImpl<char> &ResultPath, FSEntity Type) {
761 const char *Middle = Suffix.empty() ? "-%%%%%%" : "-%%%%%%.";
762 return createTemporaryFile(Prefix + Middle + Suffix, ResultFD, ResultPath,
766 std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
768 SmallVectorImpl<char> &ResultPath) {
769 return createTemporaryFile(Prefix, Suffix, ResultFD, ResultPath, FS_File);
772 std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
773 SmallVectorImpl<char> &ResultPath) {
775 return createTemporaryFile(Prefix, Suffix, Dummy, ResultPath, FS_Name);
779 // This is a mkdtemp with a different pattern. We use createUniqueEntity mostly
780 // for consistency. We should try using mkdtemp.
781 std::error_code createUniqueDirectory(const Twine &Prefix,
782 SmallVectorImpl<char> &ResultPath) {
784 return createUniqueEntity(Prefix + "-%%%%%%", Dummy, ResultPath,
788 std::error_code make_absolute(SmallVectorImpl<char> &path) {
789 StringRef p(path.data(), path.size());
791 bool rootDirectory = path::has_root_directory(p),
793 rootName = path::has_root_name(p);
799 if (rootName && rootDirectory)
800 return std::error_code();
802 // All of the following conditions will need the current directory.
803 SmallString<128> current_dir;
804 if (std::error_code ec = current_path(current_dir))
807 // Relative path. Prepend the current directory.
808 if (!rootName && !rootDirectory) {
809 // Append path to the current directory.
810 path::append(current_dir, p);
811 // Set path to the result.
812 path.swap(current_dir);
813 return std::error_code();
816 if (!rootName && rootDirectory) {
817 StringRef cdrn = path::root_name(current_dir);
818 SmallString<128> curDirRootName(cdrn.begin(), cdrn.end());
819 path::append(curDirRootName, p);
820 // Set path to the result.
821 path.swap(curDirRootName);
822 return std::error_code();
825 if (rootName && !rootDirectory) {
826 StringRef pRootName = path::root_name(p);
827 StringRef bRootDirectory = path::root_directory(current_dir);
828 StringRef bRelativePath = path::relative_path(current_dir);
829 StringRef pRelativePath = path::relative_path(p);
831 SmallString<128> res;
832 path::append(res, pRootName, bRootDirectory, bRelativePath, pRelativePath);
834 return std::error_code();
837 llvm_unreachable("All rootName and rootDirectory combinations should have "
841 std::error_code create_directories(const Twine &Path, bool IgnoreExisting) {
842 SmallString<128> PathStorage;
843 StringRef P = Path.toStringRef(PathStorage);
845 // Be optimistic and try to create the directory
846 std::error_code EC = create_directory(P, IgnoreExisting);
847 // If we succeeded, or had any error other than the parent not existing, just
849 if (EC != errc::no_such_file_or_directory)
852 // We failed because of a no_such_file_or_directory, try to create the
854 StringRef Parent = path::parent_path(P);
858 if ((EC = create_directories(Parent)))
861 return create_directory(P, IgnoreExisting);
864 std::error_code copy_file(const Twine &From, const Twine &To) {
866 if (std::error_code EC = openFileForRead(From, ReadFD))
868 if (std::error_code EC = openFileForWrite(To, WriteFD, F_None)) {
873 const size_t BufSize = 4096;
874 char *Buf = new char[BufSize];
875 int BytesRead = 0, BytesWritten = 0;
877 BytesRead = read(ReadFD, Buf, BufSize);
881 BytesWritten = write(WriteFD, Buf, BytesRead);
882 if (BytesWritten < 0)
884 BytesRead -= BytesWritten;
886 if (BytesWritten < 0)
893 if (BytesRead < 0 || BytesWritten < 0)
894 return std::error_code(errno, std::generic_category());
895 return std::error_code();
898 bool exists(file_status status) {
899 return status_known(status) && status.type() != file_type::file_not_found;
902 bool status_known(file_status s) {
903 return s.type() != file_type::status_error;
906 bool is_directory(file_status status) {
907 return status.type() == file_type::directory_file;
910 std::error_code is_directory(const Twine &path, bool &result) {
912 if (std::error_code ec = status(path, st))
914 result = is_directory(st);
915 return std::error_code();
918 bool is_regular_file(file_status status) {
919 return status.type() == file_type::regular_file;
922 std::error_code is_regular_file(const Twine &path, bool &result) {
924 if (std::error_code ec = status(path, st))
926 result = is_regular_file(st);
927 return std::error_code();
930 bool is_other(file_status status) {
931 return exists(status) &&
932 !is_regular_file(status) &&
933 !is_directory(status);
936 void directory_entry::replace_filename(const Twine &filename, file_status st) {
937 SmallString<128> path(Path.begin(), Path.end());
938 path::remove_filename(path);
939 path::append(path, filename);
944 /// @brief Identify the magic in magic.
945 file_magic identify_magic(StringRef Magic) {
946 if (Magic.size() < 4)
947 return file_magic::unknown;
948 switch ((unsigned char)Magic[0]) {
950 // COFF short import library file
951 if (Magic[1] == (char)0x00 && Magic[2] == (char)0xff &&
952 Magic[3] == (char)0xff)
953 return file_magic::coff_import_library;
954 // Windows resource file
955 const char Expected[] = { 0, 0, 0, 0, '\x20', 0, 0, 0, '\xff' };
956 if (Magic.size() >= sizeof(Expected) &&
957 memcmp(Magic.data(), Expected, sizeof(Expected)) == 0)
958 return file_magic::windows_resource;
959 // 0x0000 = COFF unknown machine type
961 return file_magic::coff_object;
964 case 0xDE: // 0x0B17C0DE = BC wraper
965 if (Magic[1] == (char)0xC0 && Magic[2] == (char)0x17 &&
966 Magic[3] == (char)0x0B)
967 return file_magic::bitcode;
970 if (Magic[1] == 'C' && Magic[2] == (char)0xC0 && Magic[3] == (char)0xDE)
971 return file_magic::bitcode;
974 if (Magic.size() >= 8)
975 if (memcmp(Magic.data(),"!<arch>\n",8) == 0)
976 return file_magic::archive;
980 if (Magic.size() >= 18 && Magic[1] == 'E' && Magic[2] == 'L' &&
982 bool Data2MSB = Magic[5] == 2;
983 unsigned high = Data2MSB ? 16 : 17;
984 unsigned low = Data2MSB ? 17 : 16;
985 if (Magic[high] == 0)
986 switch (Magic[low]) {
988 case 1: return file_magic::elf_relocatable;
989 case 2: return file_magic::elf_executable;
990 case 3: return file_magic::elf_shared_object;
991 case 4: return file_magic::elf_core;
997 if (Magic[1] == char(0xFE) && Magic[2] == char(0xBA) &&
998 Magic[3] == char(0xBE)) {
999 // This is complicated by an overlap with Java class files.
1000 // See the Mach-O section in /usr/share/file/magic for details.
1001 if (Magic.size() >= 8 && Magic[7] < 43)
1002 return file_magic::macho_universal_binary;
1006 // The two magic numbers for mach-o are:
1007 // 0xfeedface - 32-bit mach-o
1008 // 0xfeedfacf - 64-bit mach-o
1013 if (Magic[0] == char(0xFE) && Magic[1] == char(0xED) &&
1014 Magic[2] == char(0xFA) &&
1015 (Magic[3] == char(0xCE) || Magic[3] == char(0xCF))) {
1017 if (Magic.size() >= 16) type = Magic[14] << 8 | Magic[15];
1018 } else if ((Magic[0] == char(0xCE) || Magic[0] == char(0xCF)) &&
1019 Magic[1] == char(0xFA) && Magic[2] == char(0xED) &&
1020 Magic[3] == char(0xFE)) {
1021 /* Reverse endian */
1022 if (Magic.size() >= 14) type = Magic[13] << 8 | Magic[12];
1026 case 1: return file_magic::macho_object;
1027 case 2: return file_magic::macho_executable;
1028 case 3: return file_magic::macho_fixed_virtual_memory_shared_lib;
1029 case 4: return file_magic::macho_core;
1030 case 5: return file_magic::macho_preload_executable;
1031 case 6: return file_magic::macho_dynamically_linked_shared_lib;
1032 case 7: return file_magic::macho_dynamic_linker;
1033 case 8: return file_magic::macho_bundle;
1034 case 9: return file_magic::macho_dynamic_linker;
1035 case 10: return file_magic::macho_dsym_companion;
1039 case 0xF0: // PowerPC Windows
1040 case 0x83: // Alpha 32-bit
1041 case 0x84: // Alpha 64-bit
1042 case 0x66: // MPS R4000 Windows
1044 case 0x4c: // 80386 Windows
1045 case 0xc4: // ARMNT Windows
1046 if (Magic[1] == 0x01)
1047 return file_magic::coff_object;
1049 case 0x90: // PA-RISC Windows
1050 case 0x68: // mc68K Windows
1051 if (Magic[1] == 0x02)
1052 return file_magic::coff_object;
1055 case 0x4d: // Possible MS-DOS stub on Windows PE file
1056 if (Magic[1] == 0x5a) {
1058 *reinterpret_cast<const support::ulittle32_t*>(Magic.data() + 0x3c);
1059 // PE/COFF file, either EXE or DLL.
1060 if (off < Magic.size() && memcmp(Magic.data() + off, "PE\0\0",4) == 0)
1061 return file_magic::pecoff_executable;
1065 case 0x64: // x86-64 Windows.
1066 if (Magic[1] == char(0x86))
1067 return file_magic::coff_object;
1073 return file_magic::unknown;
1076 std::error_code identify_magic(const Twine &Path, file_magic &Result) {
1078 if (std::error_code EC = openFileForRead(Path, FD))
1082 int Length = read(FD, Buffer, sizeof(Buffer));
1083 if (close(FD) != 0 || Length < 0)
1084 return std::error_code(errno, std::generic_category());
1086 Result = identify_magic(StringRef(Buffer, Length));
1087 return std::error_code();
1090 std::error_code directory_entry::status(file_status &result) const {
1091 return fs::status(Path, result);
1094 } // end namespace fs
1095 } // end namespace sys
1096 } // end namespace llvm
1098 // Include the truly platform-specific parts.
1099 #if defined(LLVM_ON_UNIX)
1100 #include "Unix/Path.inc"
1102 #if defined(LLVM_ON_WIN32)
1103 #include "Windows/Path.inc"