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/ErrorOr.h"
36 #include "llvm/Support/TimeValue.h"
41 #include <system_error>
45 #ifdef HAVE_SYS_STAT_H
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>(static_cast<unsigned short>(l) |
101 static_cast<unsigned short>(r));
103 inline perms operator&(perms l, perms r) {
104 return static_cast<perms>(static_cast<unsigned short>(l) &
105 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));
124 UniqueID() = default;
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)
149 #elif defined (LLVM_ON_WIN32)
150 uint32_t LastAccessedTimeHigh;
151 uint32_t LastAccessedTimeLow;
152 uint32_t LastWriteTimeHigh;
153 uint32_t LastWriteTimeLow;
154 uint32_t VolumeSerialNumber;
155 uint32_t FileSizeHigh;
156 uint32_t FileSizeLow;
157 uint32_t FileIndexHigh;
158 uint32_t FileIndexLow;
160 friend bool equivalent(file_status A, file_status B);
165 #if defined(LLVM_ON_UNIX)
167 : fs_st_dev(0), fs_st_ino(0), fs_st_atime(0), fs_st_mtime(0),
168 fs_st_uid(0), fs_st_gid(0), fs_st_size(0),
169 Type(file_type::status_error), Perms(perms_not_known) {}
171 file_status(file_type Type)
172 : fs_st_dev(0), fs_st_ino(0), fs_st_atime(0), fs_st_mtime(0),
173 fs_st_uid(0), fs_st_gid(0), fs_st_size(0), Type(Type),
174 Perms(perms_not_known) {}
176 file_status(file_type Type, perms Perms, dev_t Dev, ino_t Ino, time_t ATime,
177 time_t MTime, uid_t UID, gid_t GID, off_t Size)
178 : fs_st_dev(Dev), fs_st_ino(Ino), fs_st_atime(ATime), fs_st_mtime(MTime),
179 fs_st_uid(UID), fs_st_gid(GID), fs_st_size(Size), Type(Type),
181 #elif defined(LLVM_ON_WIN32)
183 : LastAccessedTimeHigh(0), LastAccessedTimeLow(0), LastWriteTimeHigh(0),
184 LastWriteTimeLow(0), VolumeSerialNumber(0), FileSizeHigh(0),
185 FileSizeLow(0), FileIndexHigh(0), FileIndexLow(0),
186 Type(file_type::status_error), Perms(perms_not_known) {}
188 file_status(file_type Type)
189 : LastAccessedTimeHigh(0), LastAccessedTimeLow(0), LastWriteTimeHigh(0),
190 LastWriteTimeLow(0), VolumeSerialNumber(0), FileSizeHigh(0),
191 FileSizeLow(0), FileIndexHigh(0), FileIndexLow(0), Type(Type),
192 Perms(perms_not_known) {}
194 file_status(file_type Type, uint32_t LastAccessTimeHigh,
195 uint32_t LastAccessTimeLow, uint32_t LastWriteTimeHigh,
196 uint32_t LastWriteTimeLow, uint32_t VolumeSerialNumber,
197 uint32_t FileSizeHigh, uint32_t FileSizeLow,
198 uint32_t FileIndexHigh, uint32_t FileIndexLow)
199 : LastAccessedTimeHigh(LastAccessTimeHigh), LastAccessedTimeLow(LastAccessTimeLow),
200 LastWriteTimeHigh(LastWriteTimeHigh),
201 LastWriteTimeLow(LastWriteTimeLow),
202 VolumeSerialNumber(VolumeSerialNumber), FileSizeHigh(FileSizeHigh),
203 FileSizeLow(FileSizeLow), FileIndexHigh(FileIndexHigh),
204 FileIndexLow(FileIndexLow), Type(Type), Perms(perms_not_known) {}
208 file_type type() const { return Type; }
209 perms permissions() const { return Perms; }
210 TimeValue getLastAccessedTime() const;
211 TimeValue getLastModificationTime() const;
212 UniqueID getUniqueID() const;
214 #if defined(LLVM_ON_UNIX)
215 uint32_t getUser() const { return fs_st_uid; }
216 uint32_t getGroup() const { return fs_st_gid; }
217 uint64_t getSize() const { return fs_st_size; }
218 #elif defined (LLVM_ON_WIN32)
219 uint32_t getUser() const {
220 return 9999; // Not applicable to Windows, so...
222 uint32_t getGroup() const {
223 return 9999; // Not applicable to Windows, so...
225 uint64_t getSize() const {
226 return (uint64_t(FileSizeHigh) << 32) + FileSizeLow;
231 void type(file_type v) { Type = v; }
232 void permissions(perms p) { Perms = p; }
235 /// file_magic - An "enum class" enumeration of file types based on magic (the first
236 /// N bytes of the file).
239 unknown = 0, ///< Unrecognized file
240 bitcode, ///< Bitcode file
241 archive, ///< ar style archive file
242 elf, ///< ELF Unknown type
243 elf_relocatable, ///< ELF Relocatable object file
244 elf_executable, ///< ELF Executable image
245 elf_shared_object, ///< ELF dynamically linked shared lib
246 elf_core, ///< ELF core image
247 macho_object, ///< Mach-O Object file
248 macho_executable, ///< Mach-O Executable
249 macho_fixed_virtual_memory_shared_lib, ///< Mach-O Shared Lib, FVM
250 macho_core, ///< Mach-O Core File
251 macho_preload_executable, ///< Mach-O Preloaded Executable
252 macho_dynamically_linked_shared_lib, ///< Mach-O dynlinked shared lib
253 macho_dynamic_linker, ///< The Mach-O dynamic linker
254 macho_bundle, ///< Mach-O Bundle file
255 macho_dynamically_linked_shared_lib_stub, ///< Mach-O Shared lib stub
256 macho_dsym_companion, ///< Mach-O dSYM companion file
257 macho_kext_bundle, ///< Mach-O kext bundle file
258 macho_universal_binary, ///< Mach-O universal binary
259 coff_object, ///< COFF object file
260 coff_import_library, ///< COFF import library
261 pecoff_executable, ///< PECOFF executable file
262 windows_resource ///< Windows compiled resource file (.rc)
265 bool is_object() const {
266 return V == unknown ? false : true;
269 file_magic() : V(unknown) {}
270 file_magic(Impl V) : V(V) {}
271 operator Impl() const { return V; }
278 /// @name Physical Operators
281 /// @brief Make \a path an absolute path.
283 /// Makes \a path absolute using the \a current_directory if it is not already.
284 /// An empty \a path will result in the \a current_directory.
286 /// /absolute/path => /absolute/path
287 /// relative/../path => <current-directory>/relative/../path
289 /// @param path A path that is modified to be an absolute path.
290 /// @returns errc::success if \a path has been made absolute, otherwise a
291 /// platform-specific error_code.
292 std::error_code make_absolute(const Twine ¤t_directory,
293 SmallVectorImpl<char> &path);
295 /// @brief Make \a path an absolute path.
297 /// Makes \a path absolute using the current directory if it is not already. An
298 /// empty \a path will result in the current directory.
300 /// /absolute/path => /absolute/path
301 /// relative/../path => <current-directory>/relative/../path
303 /// @param path A path that is modified to be an absolute path.
304 /// @returns errc::success if \a path has been made absolute, otherwise a
305 /// platform-specific error_code.
306 std::error_code make_absolute(SmallVectorImpl<char> &path);
308 /// @brief Create all the non-existent directories in path.
310 /// @param path Directories to create.
311 /// @returns errc::success if is_directory(path), otherwise a platform
312 /// specific error_code. If IgnoreExisting is false, also returns
313 /// error if the directory already existed.
314 std::error_code create_directories(const Twine &path,
315 bool IgnoreExisting = true,
316 perms Perms = owner_all | group_all);
318 /// @brief Create the directory in path.
320 /// @param path Directory to create.
321 /// @returns errc::success if is_directory(path), otherwise a platform
322 /// specific error_code. If IgnoreExisting is false, also returns
323 /// error if the directory already existed.
324 std::error_code create_directory(const Twine &path, bool IgnoreExisting = true,
325 perms Perms = owner_all | group_all);
327 /// @brief Create a link from \a from to \a to.
329 /// The link may be a soft or a hard link, depending on the platform. The caller
330 /// may not assume which one. Currently on windows it creates a hard link since
331 /// soft links require extra privileges. On unix, it creates a soft link since
332 /// hard links don't work on SMB file systems.
334 /// @param to The path to hard link to.
335 /// @param from The path to hard link from. This is created.
336 /// @returns errc::success if the link was created, otherwise a platform
337 /// specific error_code.
338 std::error_code create_link(const Twine &to, const Twine &from);
340 /// @brief Get the current path.
342 /// @param result Holds the current path on return.
343 /// @returns errc::success if the current path has been stored in result,
344 /// otherwise a platform-specific error_code.
345 std::error_code current_path(SmallVectorImpl<char> &result);
347 /// @brief Remove path. Equivalent to POSIX remove().
349 /// @param path Input path.
350 /// @returns errc::success if path has been removed or didn't exist, otherwise a
351 /// platform-specific error code. If IgnoreNonExisting is false, also
352 /// returns error if the file didn't exist.
353 std::error_code remove(const Twine &path, bool IgnoreNonExisting = true);
355 /// @brief Rename \a from to \a to. Files are renamed as if by POSIX rename().
357 /// @param from The path to rename from.
358 /// @param to The path to rename to. This is created.
359 std::error_code rename(const Twine &from, const Twine &to);
361 /// @brief Copy the contents of \a From to \a To.
363 /// @param From The path to copy from.
364 /// @param To The path to copy to. This is created.
365 std::error_code copy_file(const Twine &From, const Twine &To);
367 /// @brief Resize path to size. File is resized as if by POSIX truncate().
369 /// @param FD Input file descriptor.
370 /// @param Size Size to resize to.
371 /// @returns errc::success if \a path has been resized to \a size, otherwise a
372 /// platform-specific error_code.
373 std::error_code resize_file(int FD, uint64_t Size);
376 /// @name Physical Observers
379 /// @brief Does file exist?
381 /// @param status A file_status previously returned from stat.
382 /// @returns True if the file represented by status exists, false if it does
384 bool exists(file_status status);
386 enum class AccessMode { Exist, Write, Execute };
388 /// @brief Can the file be accessed?
390 /// @param Path Input path.
391 /// @returns errc::success if the path can be accessed, otherwise a
392 /// platform-specific error_code.
393 std::error_code access(const Twine &Path, AccessMode Mode);
395 /// @brief Does file exist?
397 /// @param Path Input path.
398 /// @returns True if it exists, false otherwise.
399 inline bool exists(const Twine &Path) {
400 return !access(Path, AccessMode::Exist);
403 /// @brief Can we execute this file?
405 /// @param Path Input path.
406 /// @returns True if we can execute it, false otherwise.
407 bool can_execute(const Twine &Path);
409 /// @brief Can we write this file?
411 /// @param Path Input path.
412 /// @returns True if we can write to it, false otherwise.
413 inline bool can_write(const Twine &Path) {
414 return !access(Path, AccessMode::Write);
417 /// @brief Do file_status's represent the same thing?
419 /// @param A Input file_status.
420 /// @param B Input file_status.
422 /// assert(status_known(A) || status_known(B));
424 /// @returns True if A and B both represent the same file system entity, false
426 bool equivalent(file_status A, file_status B);
428 /// @brief Do paths represent the same thing?
430 /// assert(status_known(A) || status_known(B));
432 /// @param A Input path A.
433 /// @param B Input path B.
434 /// @param result Set to true if stat(A) and stat(B) have the same device and
435 /// inode (or equivalent).
436 /// @returns errc::success if result has been successfully set, otherwise a
437 /// platform-specific error_code.
438 std::error_code equivalent(const Twine &A, const Twine &B, bool &result);
440 /// @brief Simpler version of equivalent for clients that don't need to
441 /// differentiate between an error and false.
442 inline bool equivalent(const Twine &A, const Twine &B) {
444 return !equivalent(A, B, result) && result;
447 /// @brief Does status represent a directory?
449 /// @param status A file_status previously returned from status.
450 /// @returns status.type() == file_type::directory_file.
451 bool is_directory(file_status status);
453 /// @brief Is path a directory?
455 /// @param path Input path.
456 /// @param result Set to true if \a path is a directory, false if it is not.
457 /// Undefined otherwise.
458 /// @returns errc::success if result has been successfully set, otherwise a
459 /// platform-specific error_code.
460 std::error_code is_directory(const Twine &path, bool &result);
462 /// @brief Simpler version of is_directory for clients that don't need to
463 /// differentiate between an error and false.
464 inline bool is_directory(const Twine &Path) {
466 return !is_directory(Path, Result) && Result;
469 /// @brief Does status represent a regular file?
471 /// @param status A file_status previously returned from status.
472 /// @returns status_known(status) && status.type() == file_type::regular_file.
473 bool is_regular_file(file_status status);
475 /// @brief Is path a regular file?
477 /// @param path Input path.
478 /// @param result Set to true if \a path is a regular file, false if it is not.
479 /// Undefined otherwise.
480 /// @returns errc::success if result has been successfully set, otherwise a
481 /// platform-specific error_code.
482 std::error_code is_regular_file(const Twine &path, bool &result);
484 /// @brief Simpler version of is_regular_file for clients that don't need to
485 /// differentiate between an error and false.
486 inline bool is_regular_file(const Twine &Path) {
488 if (is_regular_file(Path, Result))
493 /// @brief Does this status represent something that exists but is not a
494 /// directory, regular file, or symlink?
496 /// @param status A file_status previously returned from status.
497 /// @returns exists(s) && !is_regular_file(s) && !is_directory(s)
498 bool is_other(file_status status);
500 /// @brief Is path something that exists but is not a directory,
501 /// regular file, or symlink?
503 /// @param path Input path.
504 /// @param result Set to true if \a path exists, but is not a directory, regular
505 /// file, or a symlink, false if it does not. Undefined otherwise.
506 /// @returns errc::success if result has been successfully set, otherwise a
507 /// platform-specific error_code.
508 std::error_code is_other(const Twine &path, bool &result);
510 /// @brief Get file status as if by POSIX stat().
512 /// @param path Input path.
513 /// @param result Set to the file status.
514 /// @returns errc::success if result has been successfully set, otherwise a
515 /// platform-specific error_code.
516 std::error_code status(const Twine &path, file_status &result);
518 /// @brief A version for when a file descriptor is already available.
519 std::error_code status(int FD, file_status &Result);
521 /// @brief Get file size.
523 /// @param Path Input path.
524 /// @param Result Set to the size of the file in \a Path.
525 /// @returns errc::success if result has been successfully set, otherwise a
526 /// platform-specific error_code.
527 inline std::error_code file_size(const Twine &Path, uint64_t &Result) {
529 std::error_code EC = status(Path, Status);
532 Result = Status.getSize();
533 return std::error_code();
536 /// @brief Set the file modification and access time.
538 /// @returns errc::success if the file times were successfully set, otherwise a
539 /// platform-specific error_code or errc::function_not_supported on
540 /// platforms where the functionality isn't available.
541 std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time);
543 /// @brief Is status available?
545 /// @param s Input file status.
546 /// @returns True if status() != status_error.
547 bool status_known(file_status s);
549 /// @brief Is status available?
551 /// @param path Input path.
552 /// @param result Set to true if status() != status_error.
553 /// @returns errc::success if result has been successfully set, otherwise a
554 /// platform-specific error_code.
555 std::error_code status_known(const Twine &path, bool &result);
557 /// @brief Create a uniquely named file.
559 /// Generates a unique path suitable for a temporary file and then opens it as a
560 /// file. The name is based on \a model with '%' replaced by a random char in
561 /// [0-9a-f]. If \a model is not an absolute path, the temporary file will be
562 /// created in the current directory.
564 /// Example: clang-%%-%%-%%-%%-%%.s => clang-a0-b1-c2-d3-e4.s
566 /// This is an atomic operation. Either the file is created and opened, or the
567 /// file system is left untouched.
569 /// The intended use is for files that are to be kept, possibly after
570 /// renaming them. For example, when running 'clang -c foo.o', the file can
571 /// be first created as foo-abc123.o and then renamed.
573 /// @param Model Name to base unique path off of.
574 /// @param ResultFD Set to the opened file's file descriptor.
575 /// @param ResultPath Set to the opened file's absolute path.
576 /// @returns errc::success if Result{FD,Path} have been successfully set,
577 /// otherwise a platform-specific error_code.
578 std::error_code createUniqueFile(const Twine &Model, int &ResultFD,
579 SmallVectorImpl<char> &ResultPath,
580 unsigned Mode = all_read | all_write);
582 /// @brief Simpler version for clients that don't want an open file.
583 std::error_code createUniqueFile(const Twine &Model,
584 SmallVectorImpl<char> &ResultPath);
586 /// @brief Create a file in the system temporary directory.
588 /// The filename is of the form prefix-random_chars.suffix. Since the directory
589 /// is not know to the caller, Prefix and Suffix cannot have path separators.
590 /// The files are created with mode 0600.
592 /// This should be used for things like a temporary .s that is removed after
593 /// running the assembler.
594 std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
596 SmallVectorImpl<char> &ResultPath);
598 /// @brief Simpler version for clients that don't want an open file.
599 std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
600 SmallVectorImpl<char> &ResultPath);
602 std::error_code createUniqueDirectory(const Twine &Prefix,
603 SmallVectorImpl<char> &ResultPath);
605 enum OpenFlags : unsigned {
608 /// F_Excl - When opening a file, this flag makes raw_fd_ostream
609 /// report an error if the file already exists.
612 /// F_Append - When opening a file, if it already exists append to the
613 /// existing file instead of returning an error. This may not be specified
617 /// The file should be opened in text mode on platforms that make this
621 /// Open the file for read and write.
625 inline OpenFlags operator|(OpenFlags A, OpenFlags B) {
626 return OpenFlags(unsigned(A) | unsigned(B));
629 inline OpenFlags &operator|=(OpenFlags &A, OpenFlags B) {
634 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
635 OpenFlags Flags, unsigned Mode = 0666);
637 std::error_code openFileForRead(const Twine &Name, int &ResultFD);
639 /// @brief Identify the type of a binary file based on how magical it is.
640 file_magic identify_magic(StringRef magic);
642 /// @brief Get and identify \a path's type based on its content.
644 /// @param path Input path.
645 /// @param result Set to the type of file, or file_magic::unknown.
646 /// @returns errc::success if result has been successfully set, otherwise a
647 /// platform-specific error_code.
648 std::error_code identify_magic(const Twine &path, file_magic &result);
650 std::error_code getUniqueID(const Twine Path, UniqueID &Result);
652 /// @brief Get disk space usage information.
654 /// Note: Users must be careful about "Time Of Check, Time Of Use" kind of bug.
655 /// Note: Windows reports results according to the quota allocated to the user.
657 /// @param Path Input path.
658 /// @returns a space_info structure filled with the capacity, free, and
659 /// available space on the device \a Path is on. A platform specific error_code
660 /// is returned on error.
661 ErrorOr<space_info> disk_space(const Twine Path);
663 /// This class represents a memory mapped file. It is based on
664 /// boost::iostreams::mapped_file.
665 class mapped_file_region {
666 mapped_file_region() = delete;
667 mapped_file_region(mapped_file_region&) = delete;
668 mapped_file_region &operator =(mapped_file_region&) = delete;
672 readonly, ///< May only access map via const_data as read only.
673 readwrite, ///< May access map via data and modify it. Written to path.
674 priv ///< May modify via data, but changes are lost on destruction.
678 /// Platform-specific mapping state.
682 std::error_code init(int FD, uint64_t Offset, mapmode Mode);
685 /// \param fd An open file descriptor to map. mapped_file_region takes
686 /// ownership if closefd is true. It must have been opended in the correct
688 mapped_file_region(int fd, mapmode mode, uint64_t length, uint64_t offset,
689 std::error_code &ec);
691 ~mapped_file_region();
693 uint64_t size() const;
696 /// Get a const view of the data. Modifying this memory has undefined
698 const char *const_data() const;
700 /// \returns The minimum alignment offset must be.
701 static int alignment();
704 /// Return the path to the main executable, given the value of argv[0] from
705 /// program startup and the address of main itself. In extremis, this function
706 /// may fail and return an empty path.
707 std::string getMainExecutable(const char *argv0, void *MainExecAddr);
713 /// directory_entry - A single entry in a directory. Caches the status either
714 /// from the result of the iteration syscall, or the first time status is
716 class directory_entry {
718 mutable file_status Status;
721 explicit directory_entry(const Twine &path, file_status st = file_status())
727 void assign(const Twine &path, file_status st = file_status()) {
732 void replace_filename(const Twine &filename, file_status st = file_status());
734 const std::string &path() const { return Path; }
735 std::error_code status(file_status &result) const;
737 bool operator==(const directory_entry& rhs) const { return Path == rhs.Path; }
738 bool operator!=(const directory_entry& rhs) const { return !(*this == rhs); }
739 bool operator< (const directory_entry& rhs) const;
740 bool operator<=(const directory_entry& rhs) const;
741 bool operator> (const directory_entry& rhs) const;
742 bool operator>=(const directory_entry& rhs) const;
748 std::error_code directory_iterator_construct(DirIterState &, StringRef);
749 std::error_code directory_iterator_increment(DirIterState &);
750 std::error_code directory_iterator_destruct(DirIterState &);
752 /// DirIterState - Keeps state for the directory_iterator. It is reference
753 /// counted in order to preserve InputIterator semantics on copy.
754 struct DirIterState : public RefCountedBase<DirIterState> {
756 : IterationHandle(0) {}
759 directory_iterator_destruct(*this);
762 intptr_t IterationHandle;
763 directory_entry CurrentEntry;
767 /// directory_iterator - Iterates through the entries in path. There is no
768 /// operator++ because we need an error_code. If it's really needed we can make
769 /// it call report_fatal_error on error.
770 class directory_iterator {
771 IntrusiveRefCntPtr<detail::DirIterState> State;
774 explicit directory_iterator(const Twine &path, std::error_code &ec) {
775 State = new detail::DirIterState;
776 SmallString<128> path_storage;
777 ec = detail::directory_iterator_construct(*State,
778 path.toStringRef(path_storage));
781 explicit directory_iterator(const directory_entry &de, std::error_code &ec) {
782 State = new detail::DirIterState;
783 ec = detail::directory_iterator_construct(*State, de.path());
786 /// Construct end iterator.
787 directory_iterator() : State(nullptr) {}
789 // No operator++ because we need error_code.
790 directory_iterator &increment(std::error_code &ec) {
791 ec = directory_iterator_increment(*State);
795 const directory_entry &operator*() const { return State->CurrentEntry; }
796 const directory_entry *operator->() const { return &State->CurrentEntry; }
798 bool operator==(const directory_iterator &RHS) const {
799 if (State == RHS.State)
802 return State->CurrentEntry == directory_entry();
804 return RHS.State->CurrentEntry == directory_entry();
805 return State->CurrentEntry == RHS.State->CurrentEntry;
808 bool operator!=(const directory_iterator &RHS) const {
809 return !(*this == RHS);
811 // Other members as required by
812 // C++ Std, 24.1.1 Input iterators [input.iterators]
816 /// RecDirIterState - Keeps state for the recursive_directory_iterator. It is
817 /// reference counted in order to preserve InputIterator semantics on copy.
818 struct RecDirIterState : public RefCountedBase<RecDirIterState> {
821 , HasNoPushRequest(false) {}
823 std::stack<directory_iterator, std::vector<directory_iterator> > Stack;
825 bool HasNoPushRequest;
829 /// recursive_directory_iterator - Same as directory_iterator except for it
830 /// recurses down into child directories.
831 class recursive_directory_iterator {
832 IntrusiveRefCntPtr<detail::RecDirIterState> State;
835 recursive_directory_iterator() {}
836 explicit recursive_directory_iterator(const Twine &path, std::error_code &ec)
837 : State(new detail::RecDirIterState) {
838 State->Stack.push(directory_iterator(path, ec));
839 if (State->Stack.top() == directory_iterator())
842 // No operator++ because we need error_code.
843 recursive_directory_iterator &increment(std::error_code &ec) {
844 const directory_iterator end_itr;
846 if (State->HasNoPushRequest)
847 State->HasNoPushRequest = false;
850 if ((ec = State->Stack.top()->status(st))) return *this;
851 if (is_directory(st)) {
852 State->Stack.push(directory_iterator(*State->Stack.top(), ec));
853 if (ec) return *this;
854 if (State->Stack.top() != end_itr) {
862 while (!State->Stack.empty()
863 && State->Stack.top().increment(ec) == end_itr) {
868 // Check if we are done. If so, create an end iterator.
869 if (State->Stack.empty())
875 const directory_entry &operator*() const { return *State->Stack.top(); }
876 const directory_entry *operator->() const { return &*State->Stack.top(); }
879 /// Gets the current level. Starting path is at level 0.
880 int level() const { return State->Level; }
882 /// Returns true if no_push has been called for this directory_entry.
883 bool no_push_request() const { return State->HasNoPushRequest; }
886 /// Goes up one level if Level > 0.
888 assert(State && "Cannot pop an end iterator!");
889 assert(State->Level > 0 && "Cannot pop an iterator with level < 1");
891 const directory_iterator end_itr;
895 report_fatal_error("Error incrementing directory iterator.");
898 } while (!State->Stack.empty()
899 && State->Stack.top().increment(ec) == end_itr);
901 // Check if we are done. If so, create an end iterator.
902 if (State->Stack.empty())
906 /// Does not go down into the current directory_entry.
907 void no_push() { State->HasNoPushRequest = true; }
909 bool operator==(const recursive_directory_iterator &RHS) const {
910 return State == RHS.State;
913 bool operator!=(const recursive_directory_iterator &RHS) const {
914 return !(*this == RHS);
916 // Other members as required by
917 // C++ Std, 24.1.1 Input iterators [input.iterators]
922 } // end namespace fs
923 } // end namespace sys
924 } // end namespace llvm