1 //===- llvm/Support/FileSystem.h - File System OS Concept -------*- C++ -*-===//
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 declares the llvm::sys::fs namespace. It is designed after
11 // TR2/boost filesystem (v3), but modified to remove exception handling and the
14 // All functions return an error_code and their actual work via the last out
15 // argument. The out argument is defined if and only if errc::success is
16 // returned. A function may return any error code in the generic or system
17 // category. However, they shall be equivalent to any error conditions listed
18 // in each functions respective documentation if the condition applies. [ note:
19 // this does not guarantee that error_code will be in the set of explicitly
20 // listed codes, but it does guarantee that if any of the explicitly listed
21 // errors occur, the correct error_code will be used ]. All functions may
22 // return errc::not_enough_memory if there is not enough memory to complete the
25 //===----------------------------------------------------------------------===//
27 #ifndef LLVM_SUPPORT_FILESYSTEM_H
28 #define LLVM_SUPPORT_FILESYSTEM_H
30 #include "llvm/ADT/IntrusiveRefCntPtr.h"
31 #include "llvm/ADT/SmallString.h"
32 #include "llvm/ADT/Twine.h"
33 #include "llvm/Support/DataTypes.h"
34 #include "llvm/Support/ErrorHandling.h"
35 #include "llvm/Support/TimeValue.h"
40 #include <system_error>
44 #ifdef HAVE_SYS_STAT_H
49 using std::error_code;
53 /// An enumeration for the file system's view of the type.
54 enum class file_type {
67 /// space_info - Self explanatory.
79 owner_all = owner_read | owner_write | owner_exe,
83 group_all = group_read | group_write | group_exe,
87 others_all = others_read | others_write | others_exe,
88 all_read = owner_read | group_read | others_read,
89 all_write = owner_write | group_write | others_write,
90 all_exe = owner_exe | group_exe | others_exe,
91 all_all = owner_all | group_all | others_all,
92 set_uid_on_exe = 04000,
93 set_gid_on_exe = 02000,
95 perms_not_known = 0xFFFF
98 // Helper functions so that you can use & and | to manipulate perms bits:
99 inline perms operator|(perms l , perms r) {
100 return static_cast<perms>(
101 static_cast<unsigned short>(l) | static_cast<unsigned short>(r));
103 inline perms operator&(perms l , perms r) {
104 return static_cast<perms>(
105 static_cast<unsigned short>(l) & static_cast<unsigned short>(r));
107 inline perms &operator|=(perms &l, perms r) {
111 inline perms &operator&=(perms &l, perms r) {
115 inline perms operator~(perms x) {
116 return static_cast<perms>(~static_cast<unsigned short>(x));
125 UniqueID(uint64_t Device, uint64_t File) : Device(Device), File(File) {}
126 bool operator==(const UniqueID &Other) const {
127 return Device == Other.Device && File == Other.File;
129 bool operator!=(const UniqueID &Other) const { return !(*this == Other); }
130 bool operator<(const UniqueID &Other) const {
131 return std::tie(Device, File) < std::tie(Other.Device, Other.File);
133 uint64_t getDevice() const { return Device; }
134 uint64_t getFile() const { return File; }
137 /// file_status - Represents the result of a call to stat and friends. It has
138 /// a platform specific member to store the result.
141 #if defined(LLVM_ON_UNIX)
148 #elif defined (LLVM_ON_WIN32)
149 uint32_t LastWriteTimeHigh;
150 uint32_t LastWriteTimeLow;
151 uint32_t VolumeSerialNumber;
152 uint32_t FileSizeHigh;
153 uint32_t FileSizeLow;
154 uint32_t FileIndexHigh;
155 uint32_t FileIndexLow;
157 friend bool equivalent(file_status A, file_status B);
161 #if defined(LLVM_ON_UNIX)
162 file_status() : fs_st_dev(0), fs_st_ino(0), fs_st_mtime(0),
163 fs_st_uid(0), fs_st_gid(0), fs_st_size(0),
164 Type(file_type::status_error), Perms(perms_not_known) {}
166 file_status(file_type Type) : fs_st_dev(0), fs_st_ino(0), fs_st_mtime(0),
167 fs_st_uid(0), fs_st_gid(0), fs_st_size(0), Type(Type),
168 Perms(perms_not_known) {}
170 file_status(file_type Type, perms Perms, dev_t Dev, ino_t Ino, time_t MTime,
171 uid_t UID, gid_t GID, off_t Size)
172 : fs_st_dev(Dev), fs_st_ino(Ino), fs_st_mtime(MTime), fs_st_uid(UID),
173 fs_st_gid(GID), fs_st_size(Size), Type(Type), Perms(Perms) {}
174 #elif defined(LLVM_ON_WIN32)
175 file_status() : LastWriteTimeHigh(0), LastWriteTimeLow(0),
176 VolumeSerialNumber(0), FileSizeHigh(0), FileSizeLow(0),
177 FileIndexHigh(0), FileIndexLow(0), Type(file_type::status_error),
178 Perms(perms_not_known) {}
180 file_status(file_type Type) : LastWriteTimeHigh(0), LastWriteTimeLow(0),
181 VolumeSerialNumber(0), FileSizeHigh(0), FileSizeLow(0),
182 FileIndexHigh(0), FileIndexLow(0), Type(Type),
183 Perms(perms_not_known) {}
185 file_status(file_type Type, uint32_t LastWriteTimeHigh,
186 uint32_t LastWriteTimeLow, uint32_t VolumeSerialNumber,
187 uint32_t FileSizeHigh, uint32_t FileSizeLow,
188 uint32_t FileIndexHigh, uint32_t FileIndexLow)
189 : LastWriteTimeHigh(LastWriteTimeHigh),
190 LastWriteTimeLow(LastWriteTimeLow),
191 VolumeSerialNumber(VolumeSerialNumber), FileSizeHigh(FileSizeHigh),
192 FileSizeLow(FileSizeLow), FileIndexHigh(FileIndexHigh),
193 FileIndexLow(FileIndexLow), Type(Type), Perms(perms_not_known) {}
197 file_type type() const { return Type; }
198 perms permissions() const { return Perms; }
199 TimeValue getLastModificationTime() const;
200 UniqueID getUniqueID() const;
202 #if defined(LLVM_ON_UNIX)
203 uint32_t getUser() const { return fs_st_uid; }
204 uint32_t getGroup() const { return fs_st_gid; }
205 uint64_t getSize() const { return fs_st_size; }
206 #elif defined (LLVM_ON_WIN32)
207 uint32_t getUser() const {
208 return 9999; // Not applicable to Windows, so...
210 uint32_t getGroup() const {
211 return 9999; // Not applicable to Windows, so...
213 uint64_t getSize() const {
214 return (uint64_t(FileSizeHigh) << 32) + FileSizeLow;
219 void type(file_type v) { Type = v; }
220 void permissions(perms p) { Perms = p; }
223 /// file_magic - An "enum class" enumeration of file types based on magic (the first
224 /// N bytes of the file).
227 unknown = 0, ///< Unrecognized file
228 bitcode, ///< Bitcode file
229 archive, ///< ar style archive file
230 elf_relocatable, ///< ELF Relocatable object file
231 elf_executable, ///< ELF Executable image
232 elf_shared_object, ///< ELF dynamically linked shared lib
233 elf_core, ///< ELF core image
234 macho_object, ///< Mach-O Object file
235 macho_executable, ///< Mach-O Executable
236 macho_fixed_virtual_memory_shared_lib, ///< Mach-O Shared Lib, FVM
237 macho_core, ///< Mach-O Core File
238 macho_preload_executable, ///< Mach-O Preloaded Executable
239 macho_dynamically_linked_shared_lib, ///< Mach-O dynlinked shared lib
240 macho_dynamic_linker, ///< The Mach-O dynamic linker
241 macho_bundle, ///< Mach-O Bundle file
242 macho_dynamically_linked_shared_lib_stub, ///< Mach-O Shared lib stub
243 macho_dsym_companion, ///< Mach-O dSYM companion file
244 macho_universal_binary, ///< Mach-O universal binary
245 coff_object, ///< COFF object file
246 coff_import_library, ///< COFF import library
247 pecoff_executable, ///< PECOFF executable file
248 windows_resource ///< Windows compiled resource file (.rc)
251 bool is_object() const {
252 return V == unknown ? false : true;
255 file_magic() : V(unknown) {}
256 file_magic(Impl V) : V(V) {}
257 operator Impl() const { return V; }
264 /// @name Physical Operators
267 /// @brief Make \a path an absolute path.
269 /// Makes \a path absolute using the current directory if it is not already. An
270 /// empty \a path will result in the current directory.
272 /// /absolute/path => /absolute/path
273 /// relative/../path => <current-directory>/relative/../path
275 /// @param path A path that is modified to be an absolute path.
276 /// @returns errc::success if \a path has been made absolute, otherwise a
277 /// platform specific error_code.
278 error_code make_absolute(SmallVectorImpl<char> &path);
280 /// @brief Normalize path separators in \a Path
282 /// If the path contains any '\' separators, they are transformed into '/'.
283 /// This is particularly useful when cross-compiling Windows on Linux, but is
284 /// safe to invoke on Windows, which accepts both characters as a path
286 error_code normalize_separators(SmallVectorImpl<char> &Path);
288 /// @brief Create all the non-existent directories in path.
290 /// @param path Directories to create.
291 /// @returns errc::success if is_directory(path), otherwise a platform
292 /// specific error_code. If IgnoreExisting is false, also returns
293 /// error if the directory already existed.
294 error_code create_directories(const Twine &path, bool IgnoreExisting = true);
296 /// @brief Create the directory in path.
298 /// @param path Directory to create.
299 /// @returns errc::success if is_directory(path), otherwise a platform
300 /// specific error_code. If IgnoreExisting is false, also returns
301 /// error if the directory already existed.
302 error_code create_directory(const Twine &path, bool IgnoreExisting = true);
304 /// @brief Create a link from \a from to \a to.
306 /// The link may be a soft or a hard link, depending on the platform. The caller
307 /// may not assume which one. Currently on windows it creates a hard link since
308 /// soft links require extra privileges. On unix, it creates a soft link since
309 /// hard links don't work on SMB file systems.
311 /// @param to The path to hard link to.
312 /// @param from The path to hard link from. This is created.
313 /// @returns errc::success if the link was created, otherwise a platform
314 /// specific error_code.
315 error_code create_link(const Twine &to, const Twine &from);
317 /// @brief Get the current path.
319 /// @param result Holds the current path on return.
320 /// @returns errc::success if the current path has been stored in result,
321 /// otherwise a platform specific error_code.
322 error_code current_path(SmallVectorImpl<char> &result);
324 /// @brief Remove path. Equivalent to POSIX remove().
326 /// @param path Input path.
327 /// @returns errc::success if path has been removed or didn't exist, otherwise a
328 /// platform specific error code. If IgnoreNonExisting is false, also
329 /// returns error if the file didn't exist.
330 error_code remove(const Twine &path, bool IgnoreNonExisting = true);
332 /// @brief Rename \a from to \a to. Files are renamed as if by POSIX rename().
334 /// @param from The path to rename from.
335 /// @param to The path to rename to. This is created.
336 error_code rename(const Twine &from, const Twine &to);
338 /// @brief Resize path to size. File is resized as if by POSIX truncate().
340 /// @param path Input path.
341 /// @param size Size to resize to.
342 /// @returns errc::success if \a path has been resized to \a size, otherwise a
343 /// platform specific error_code.
344 error_code resize_file(const Twine &path, uint64_t size);
347 /// @name Physical Observers
350 /// @brief Does file exist?
352 /// @param status A file_status previously returned from stat.
353 /// @returns True if the file represented by status exists, false if it does
355 bool exists(file_status status);
357 /// @brief Does file exist?
359 /// @param path Input path.
360 /// @param result Set to true if the file represented by status exists, false if
361 /// it does not. Undefined otherwise.
362 /// @returns errc::success if result has been successfully set, otherwise a
363 /// platform specific error_code.
364 error_code exists(const Twine &path, bool &result);
366 /// @brief Simpler version of exists for clients that don't need to
367 /// differentiate between an error and false.
368 inline bool exists(const Twine &path) {
370 return !exists(path, result) && result;
373 /// @brief Can we execute this file?
375 /// @param Path Input path.
376 /// @returns True if we can execute it, false otherwise.
377 bool can_execute(const Twine &Path);
379 /// @brief Can we write this file?
381 /// @param Path Input path.
382 /// @returns True if we can write to it, false otherwise.
383 bool can_write(const Twine &Path);
385 /// @brief Do file_status's represent the same thing?
387 /// @param A Input file_status.
388 /// @param B Input file_status.
390 /// assert(status_known(A) || status_known(B));
392 /// @returns True if A and B both represent the same file system entity, false
394 bool equivalent(file_status A, file_status B);
396 /// @brief Do paths represent the same thing?
398 /// assert(status_known(A) || status_known(B));
400 /// @param A Input path A.
401 /// @param B Input path B.
402 /// @param result Set to true if stat(A) and stat(B) have the same device and
403 /// inode (or equivalent).
404 /// @returns errc::success if result has been successfully set, otherwise a
405 /// platform specific error_code.
406 error_code equivalent(const Twine &A, const Twine &B, bool &result);
408 /// @brief Simpler version of equivalent for clients that don't need to
409 /// differentiate between an error and false.
410 inline bool equivalent(const Twine &A, const Twine &B) {
412 return !equivalent(A, B, result) && result;
415 /// @brief Does status represent a directory?
417 /// @param status A file_status previously returned from status.
418 /// @returns status.type() == file_type::directory_file.
419 bool is_directory(file_status status);
421 /// @brief Is path a directory?
423 /// @param path Input path.
424 /// @param result Set to true if \a path is a directory, false if it is not.
425 /// Undefined otherwise.
426 /// @returns errc::success if result has been successfully set, otherwise a
427 /// platform specific error_code.
428 error_code is_directory(const Twine &path, bool &result);
430 /// @brief Simpler version of is_directory for clients that don't need to
431 /// differentiate between an error and false.
432 inline bool is_directory(const Twine &Path) {
434 return !is_directory(Path, Result) && Result;
437 /// @brief Does status represent a regular file?
439 /// @param status A file_status previously returned from status.
440 /// @returns status_known(status) && status.type() == file_type::regular_file.
441 bool is_regular_file(file_status status);
443 /// @brief Is path a regular file?
445 /// @param path Input path.
446 /// @param result Set to true if \a path is a regular file, false if it is not.
447 /// Undefined otherwise.
448 /// @returns errc::success if result has been successfully set, otherwise a
449 /// platform specific error_code.
450 error_code is_regular_file(const Twine &path, bool &result);
452 /// @brief Simpler version of is_regular_file for clients that don't need to
453 /// differentiate between an error and false.
454 inline bool is_regular_file(const Twine &Path) {
456 if (is_regular_file(Path, Result))
461 /// @brief Does this status represent something that exists but is not a
462 /// directory, regular file, or symlink?
464 /// @param status A file_status previously returned from status.
465 /// @returns exists(s) && !is_regular_file(s) && !is_directory(s)
466 bool is_other(file_status status);
468 /// @brief Is path something that exists but is not a directory,
469 /// regular file, or symlink?
471 /// @param path Input path.
472 /// @param result Set to true if \a path exists, but is not a directory, regular
473 /// file, or a symlink, false if it does not. Undefined otherwise.
474 /// @returns errc::success if result has been successfully set, otherwise a
475 /// platform specific error_code.
476 error_code is_other(const Twine &path, bool &result);
478 /// @brief Get file status as if by POSIX stat().
480 /// @param path Input path.
481 /// @param result Set to the file status.
482 /// @returns errc::success if result has been successfully set, otherwise a
483 /// platform specific error_code.
484 error_code status(const Twine &path, file_status &result);
486 /// @brief A version for when a file descriptor is already available.
487 error_code status(int FD, file_status &Result);
489 /// @brief Get file size.
491 /// @param Path Input path.
492 /// @param Result Set to the size of the file in \a Path.
493 /// @returns errc::success if result has been successfully set, otherwise a
494 /// platform specific error_code.
495 inline error_code file_size(const Twine &Path, uint64_t &Result) {
497 error_code EC = status(Path, Status);
500 Result = Status.getSize();
504 /// @brief Set the file modification and access time.
506 /// @returns errc::success if the file times were successfully set, otherwise a
507 /// platform specific error_code or errc::not_supported on platforms
508 /// where the functionality isn't available.
509 error_code setLastModificationAndAccessTime(int FD, TimeValue Time);
511 /// @brief Is status available?
513 /// @param s Input file status.
514 /// @returns True if status() != status_error.
515 bool status_known(file_status s);
517 /// @brief Is status available?
519 /// @param path Input path.
520 /// @param result Set to true if status() != status_error.
521 /// @returns errc::success if result has been successfully set, otherwise a
522 /// platform specific error_code.
523 error_code status_known(const Twine &path, bool &result);
525 /// @brief Create a uniquely named file.
527 /// Generates a unique path suitable for a temporary file and then opens it as a
528 /// file. The name is based on \a model with '%' replaced by a random char in
529 /// [0-9a-f]. If \a model is not an absolute path, a suitable temporary
530 /// directory will be prepended.
532 /// Example: clang-%%-%%-%%-%%-%%.s => clang-a0-b1-c2-d3-e4.s
534 /// This is an atomic operation. Either the file is created and opened, or the
535 /// file system is left untouched.
537 /// The intendend use is for files that are to be kept, possibly after
538 /// renaming them. For example, when running 'clang -c foo.o', the file can
539 /// be first created as foo-abc123.o and then renamed.
541 /// @param Model Name to base unique path off of.
542 /// @param ResultFD Set to the opened file's file descriptor.
543 /// @param ResultPath Set to the opened file's absolute path.
544 /// @returns errc::success if Result{FD,Path} have been successfully set,
545 /// otherwise a platform specific error_code.
546 error_code createUniqueFile(const Twine &Model, int &ResultFD,
547 SmallVectorImpl<char> &ResultPath,
548 unsigned Mode = all_read | all_write);
550 /// @brief Simpler version for clients that don't want an open file.
551 error_code createUniqueFile(const Twine &Model,
552 SmallVectorImpl<char> &ResultPath);
554 /// @brief Create a file in the system temporary directory.
556 /// The filename is of the form prefix-random_chars.suffix. Since the directory
557 /// is not know to the caller, Prefix and Suffix cannot have path separators.
558 /// The files are created with mode 0600.
560 /// This should be used for things like a temporary .s that is removed after
561 /// running the assembler.
562 error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
564 SmallVectorImpl<char> &ResultPath);
566 /// @brief Simpler version for clients that don't want an open file.
567 error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
568 SmallVectorImpl<char> &ResultPath);
570 error_code createUniqueDirectory(const Twine &Prefix,
571 SmallVectorImpl<char> &ResultPath);
573 enum OpenFlags : unsigned {
576 /// F_Excl - When opening a file, this flag makes raw_fd_ostream
577 /// report an error if the file already exists.
580 /// F_Append - When opening a file, if it already exists append to the
581 /// existing file instead of returning an error. This may not be specified
585 /// The file should be opened in text mode on platforms that make this
589 /// Open the file for read and write.
593 inline OpenFlags operator|(OpenFlags A, OpenFlags B) {
594 return OpenFlags(unsigned(A) | unsigned(B));
597 inline OpenFlags &operator|=(OpenFlags &A, OpenFlags B) {
602 error_code openFileForWrite(const Twine &Name, int &ResultFD, OpenFlags Flags,
603 unsigned Mode = 0666);
605 error_code openFileForRead(const Twine &Name, int &ResultFD);
607 /// @brief Identify the type of a binary file based on how magical it is.
608 file_magic identify_magic(StringRef magic);
610 /// @brief Get and identify \a path's type based on its content.
612 /// @param path Input path.
613 /// @param result Set to the type of file, or file_magic::unknown.
614 /// @returns errc::success if result has been successfully set, otherwise a
615 /// platform specific error_code.
616 error_code identify_magic(const Twine &path, file_magic &result);
618 error_code getUniqueID(const Twine Path, UniqueID &Result);
620 /// This class represents a memory mapped file. It is based on
621 /// boost::iostreams::mapped_file.
622 class mapped_file_region {
623 mapped_file_region() LLVM_DELETED_FUNCTION;
624 mapped_file_region(mapped_file_region&) LLVM_DELETED_FUNCTION;
625 mapped_file_region &operator =(mapped_file_region&) LLVM_DELETED_FUNCTION;
629 readonly, ///< May only access map via const_data as read only.
630 readwrite, ///< May access map via data and modify it. Written to path.
631 priv ///< May modify via data, but changes are lost on destruction.
635 /// Platform specific mapping state.
642 void *FileMappingHandle;
645 error_code init(int FD, bool CloseFD, uint64_t Offset);
648 typedef char char_type;
650 mapped_file_region(mapped_file_region&&);
651 mapped_file_region &operator =(mapped_file_region&&);
653 /// Construct a mapped_file_region at \a path starting at \a offset of length
654 /// \a length and with access \a mode.
656 /// \param path Path to the file to map. If it does not exist it will be
658 /// \param mode How to map the memory.
659 /// \param length Number of bytes to map in starting at \a offset. If the file
660 /// is shorter than this, it will be extended. If \a length is
661 /// 0, the entire file will be mapped.
662 /// \param offset Byte offset from the beginning of the file where the map
663 /// should begin. Must be a multiple of
664 /// mapped_file_region::alignment().
665 /// \param ec This is set to errc::success if the map was constructed
666 /// successfully. Otherwise it is set to a platform dependent error.
667 mapped_file_region(const Twine &path,
673 /// \param fd An open file descriptor to map. mapped_file_region takes
674 /// ownership if closefd is true. It must have been opended in the correct
676 mapped_file_region(int fd,
683 ~mapped_file_region();
685 mapmode flags() const;
686 uint64_t size() const;
689 /// Get a const view of the data. Modifying this memory has undefined
691 const char *const_data() const;
693 /// \returns The minimum alignment offset must be.
694 static int alignment();
697 /// Return the path to the main executable, given the value of argv[0] from
698 /// program startup and the address of main itself. In extremis, this function
699 /// may fail and return an empty path.
700 std::string getMainExecutable(const char *argv0, void *MainExecAddr);
706 /// directory_entry - A single entry in a directory. Caches the status either
707 /// from the result of the iteration syscall, or the first time status is
709 class directory_entry {
711 mutable file_status Status;
714 explicit directory_entry(const Twine &path, file_status st = file_status())
720 void assign(const Twine &path, file_status st = file_status()) {
725 void replace_filename(const Twine &filename, file_status st = file_status());
727 const std::string &path() const { return Path; }
728 error_code status(file_status &result) const;
730 bool operator==(const directory_entry& rhs) const { return Path == rhs.Path; }
731 bool operator!=(const directory_entry& rhs) const { return !(*this == rhs); }
732 bool operator< (const directory_entry& rhs) const;
733 bool operator<=(const directory_entry& rhs) const;
734 bool operator> (const directory_entry& rhs) const;
735 bool operator>=(const directory_entry& rhs) const;
741 error_code directory_iterator_construct(DirIterState&, StringRef);
742 error_code directory_iterator_increment(DirIterState&);
743 error_code directory_iterator_destruct(DirIterState&);
745 /// DirIterState - Keeps state for the directory_iterator. It is reference
746 /// counted in order to preserve InputIterator semantics on copy.
747 struct DirIterState : public RefCountedBase<DirIterState> {
749 : IterationHandle(0) {}
752 directory_iterator_destruct(*this);
755 intptr_t IterationHandle;
756 directory_entry CurrentEntry;
760 /// directory_iterator - Iterates through the entries in path. There is no
761 /// operator++ because we need an error_code. If it's really needed we can make
762 /// it call report_fatal_error on error.
763 class directory_iterator {
764 IntrusiveRefCntPtr<detail::DirIterState> State;
767 explicit directory_iterator(const Twine &path, error_code &ec) {
768 State = new detail::DirIterState;
769 SmallString<128> path_storage;
770 ec = detail::directory_iterator_construct(*State,
771 path.toStringRef(path_storage));
774 explicit directory_iterator(const directory_entry &de, error_code &ec) {
775 State = new detail::DirIterState;
776 ec = detail::directory_iterator_construct(*State, de.path());
779 /// Construct end iterator.
780 directory_iterator() : State(nullptr) {}
782 // No operator++ because we need error_code.
783 directory_iterator &increment(error_code &ec) {
784 ec = directory_iterator_increment(*State);
788 const directory_entry &operator*() const { return State->CurrentEntry; }
789 const directory_entry *operator->() const { return &State->CurrentEntry; }
791 bool operator==(const directory_iterator &RHS) const {
792 if (State == RHS.State)
795 return State->CurrentEntry == directory_entry();
797 return RHS.State->CurrentEntry == directory_entry();
798 return State->CurrentEntry == RHS.State->CurrentEntry;
801 bool operator!=(const directory_iterator &RHS) const {
802 return !(*this == RHS);
804 // Other members as required by
805 // C++ Std, 24.1.1 Input iterators [input.iterators]
809 /// RecDirIterState - Keeps state for the recursive_directory_iterator. It is
810 /// reference counted in order to preserve InputIterator semantics on copy.
811 struct RecDirIterState : public RefCountedBase<RecDirIterState> {
814 , HasNoPushRequest(false) {}
816 std::stack<directory_iterator, std::vector<directory_iterator> > Stack;
818 bool HasNoPushRequest;
822 /// recursive_directory_iterator - Same as directory_iterator except for it
823 /// recurses down into child directories.
824 class recursive_directory_iterator {
825 IntrusiveRefCntPtr<detail::RecDirIterState> State;
828 recursive_directory_iterator() {}
829 explicit recursive_directory_iterator(const Twine &path, error_code &ec)
830 : State(new detail::RecDirIterState) {
831 State->Stack.push(directory_iterator(path, ec));
832 if (State->Stack.top() == directory_iterator())
835 // No operator++ because we need error_code.
836 recursive_directory_iterator &increment(error_code &ec) {
837 const directory_iterator end_itr;
839 if (State->HasNoPushRequest)
840 State->HasNoPushRequest = false;
843 if ((ec = State->Stack.top()->status(st))) return *this;
844 if (is_directory(st)) {
845 State->Stack.push(directory_iterator(*State->Stack.top(), ec));
846 if (ec) return *this;
847 if (State->Stack.top() != end_itr) {
855 while (!State->Stack.empty()
856 && State->Stack.top().increment(ec) == end_itr) {
861 // Check if we are done. If so, create an end iterator.
862 if (State->Stack.empty())
868 const directory_entry &operator*() const { return *State->Stack.top(); }
869 const directory_entry *operator->() const { return &*State->Stack.top(); }
872 /// Gets the current level. Starting path is at level 0.
873 int level() const { return State->Level; }
875 /// Returns true if no_push has been called for this directory_entry.
876 bool no_push_request() const { return State->HasNoPushRequest; }
879 /// Goes up one level if Level > 0.
881 assert(State && "Cannot pop an end iterator!");
882 assert(State->Level > 0 && "Cannot pop an iterator with level < 1");
884 const directory_iterator end_itr;
888 report_fatal_error("Error incrementing directory iterator.");
891 } while (!State->Stack.empty()
892 && State->Stack.top().increment(ec) == end_itr);
894 // Check if we are done. If so, create an end iterator.
895 if (State->Stack.empty())
899 /// Does not go down into the current directory_entry.
900 void no_push() { State->HasNoPushRequest = true; }
902 bool operator==(const recursive_directory_iterator &RHS) const {
903 return State == RHS.State;
906 bool operator!=(const recursive_directory_iterator &RHS) const {
907 return !(*this == RHS);
909 // Other members as required by
910 // C++ Std, 24.1.1 Input iterators [input.iterators]
915 } // end namespace fs
916 } // end namespace sys
917 } // end namespace llvm