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/SmallString.h"
31 #include "llvm/ADT/StringRef.h"
32 #include "llvm/ADT/Twine.h"
33 #include "llvm/Support/Chrono.h"
34 #include "llvm/Support/ErrorHandling.h"
35 #include "llvm/Support/ErrorOr.h"
36 #include "llvm/Support/MD5.h"
43 #include <system_error>
47 #ifdef HAVE_SYS_STAT_H
55 /// An enumeration for the file system's view of the type.
56 enum class file_type {
69 /// space_info - Self explanatory.
81 owner_all = owner_read | owner_write | owner_exe,
85 group_all = group_read | group_write | group_exe,
89 others_all = others_read | others_write | others_exe,
90 all_read = owner_read | group_read | others_read,
91 all_write = owner_write | group_write | others_write,
92 all_exe = owner_exe | group_exe | others_exe,
93 all_all = owner_all | group_all | others_all,
94 set_uid_on_exe = 04000,
95 set_gid_on_exe = 02000,
97 all_perms = all_all | set_uid_on_exe | set_gid_on_exe | sticky_bit,
98 perms_not_known = 0xFFFF
101 // Helper functions so that you can use & and | to manipulate perms bits:
102 inline perms operator|(perms l, perms r) {
103 return static_cast<perms>(static_cast<unsigned short>(l) |
104 static_cast<unsigned short>(r));
106 inline perms operator&(perms l, perms r) {
107 return static_cast<perms>(static_cast<unsigned short>(l) &
108 static_cast<unsigned short>(r));
110 inline perms &operator|=(perms &l, perms r) {
114 inline perms &operator&=(perms &l, perms r) {
118 inline perms operator~(perms x) {
119 // Avoid UB by explicitly truncating the (unsigned) ~ result.
120 return static_cast<perms>(
121 static_cast<unsigned short>(~static_cast<unsigned short>(x)));
129 UniqueID() = default;
130 UniqueID(uint64_t Device, uint64_t File) : Device(Device), File(File) {}
132 bool operator==(const UniqueID &Other) const {
133 return Device == Other.Device && File == Other.File;
135 bool operator!=(const UniqueID &Other) const { return !(*this == Other); }
136 bool operator<(const UniqueID &Other) const {
137 return std::tie(Device, File) < std::tie(Other.Device, Other.File);
140 uint64_t getDevice() const { return Device; }
141 uint64_t getFile() const { return File; }
144 /// file_status - Represents the result of a call to stat and friends. It has
145 /// a platform-specific member to store the result.
148 friend bool equivalent(file_status A, file_status B);
150 #if defined(LLVM_ON_UNIX)
152 nlink_t fs_st_nlinks = 0;
154 time_t fs_st_atime = 0;
155 time_t fs_st_mtime = 0;
158 off_t fs_st_size = 0;
159 #elif defined (LLVM_ON_WIN32)
160 uint32_t NumLinks = 0;
161 uint32_t LastAccessedTimeHigh = 0;
162 uint32_t LastAccessedTimeLow = 0;
163 uint32_t LastWriteTimeHigh = 0;
164 uint32_t LastWriteTimeLow = 0;
165 uint32_t VolumeSerialNumber = 0;
166 uint32_t FileSizeHigh = 0;
167 uint32_t FileSizeLow = 0;
168 uint32_t FileIndexHigh = 0;
169 uint32_t FileIndexLow = 0;
171 file_type Type = file_type::status_error;
172 perms Perms = perms_not_known;
175 #if defined(LLVM_ON_UNIX)
176 file_status() = default;
178 file_status(file_type Type) : Type(Type) {}
180 file_status(file_type Type, perms Perms, dev_t Dev, nlink_t Links, ino_t Ino,
181 time_t ATime, time_t MTime, uid_t UID, gid_t GID, off_t Size)
182 : fs_st_dev(Dev), fs_st_nlinks(Links), fs_st_ino(Ino), fs_st_atime(ATime),
183 fs_st_mtime(MTime), fs_st_uid(UID), fs_st_gid(GID), fs_st_size(Size),
184 Type(Type), Perms(Perms) {}
185 #elif defined(LLVM_ON_WIN32)
186 file_status() = default;
188 file_status(file_type Type) : Type(Type) {}
190 file_status(file_type Type, perms Perms, uint32_t LinkCount,
191 uint32_t LastAccessTimeHigh, uint32_t LastAccessTimeLow,
192 uint32_t LastWriteTimeHigh, uint32_t LastWriteTimeLow,
193 uint32_t VolumeSerialNumber, uint32_t FileSizeHigh,
194 uint32_t FileSizeLow, uint32_t FileIndexHigh,
195 uint32_t FileIndexLow)
196 : NumLinks(LinkCount), LastAccessedTimeHigh(LastAccessTimeHigh),
197 LastAccessedTimeLow(LastAccessTimeLow),
198 LastWriteTimeHigh(LastWriteTimeHigh),
199 LastWriteTimeLow(LastWriteTimeLow),
200 VolumeSerialNumber(VolumeSerialNumber), FileSizeHigh(FileSizeHigh),
201 FileSizeLow(FileSizeLow), FileIndexHigh(FileIndexHigh),
202 FileIndexLow(FileIndexLow), Type(Type), Perms(Perms) {}
206 file_type type() const { return Type; }
207 perms permissions() const { return Perms; }
208 TimePoint<> getLastAccessedTime() const;
209 TimePoint<> getLastModificationTime() const;
210 UniqueID getUniqueID() const;
211 uint32_t getLinkCount() const;
213 #if defined(LLVM_ON_UNIX)
214 uint32_t getUser() const { return fs_st_uid; }
215 uint32_t getGroup() const { return fs_st_gid; }
216 uint64_t getSize() const { return fs_st_size; }
217 #elif defined (LLVM_ON_WIN32)
218 uint32_t getUser() const {
219 return 9999; // Not applicable to Windows, so...
222 uint32_t getGroup() const {
223 return 9999; // Not applicable to Windows, so...
226 uint64_t getSize() const {
227 return (uint64_t(FileSizeHigh) << 32) + FileSizeLow;
232 void type(file_type v) { Type = v; }
233 void permissions(perms p) { Perms = p; }
237 /// @name Physical Operators
240 /// @brief Make \a path an absolute path.
242 /// Makes \a path absolute using the \a current_directory if it is not already.
243 /// An empty \a path will result in the \a current_directory.
245 /// /absolute/path => /absolute/path
246 /// relative/../path => <current-directory>/relative/../path
248 /// @param path A path that is modified to be an absolute path.
249 /// @returns errc::success if \a path has been made absolute, otherwise a
250 /// platform-specific error_code.
251 std::error_code make_absolute(const Twine ¤t_directory,
252 SmallVectorImpl<char> &path);
254 /// @brief Make \a path an absolute path.
256 /// Makes \a path absolute using the current directory if it is not already. An
257 /// empty \a path will result in the current directory.
259 /// /absolute/path => /absolute/path
260 /// relative/../path => <current-directory>/relative/../path
262 /// @param path A path that is modified to be an absolute path.
263 /// @returns errc::success if \a path has been made absolute, otherwise a
264 /// platform-specific error_code.
265 std::error_code make_absolute(SmallVectorImpl<char> &path);
267 /// @brief Create all the non-existent directories in path.
269 /// @param path Directories to create.
270 /// @returns errc::success if is_directory(path), otherwise a platform
271 /// specific error_code. If IgnoreExisting is false, also returns
272 /// error if the directory already existed.
273 std::error_code create_directories(const Twine &path,
274 bool IgnoreExisting = true,
275 perms Perms = owner_all | group_all);
277 /// @brief Create the directory in path.
279 /// @param path Directory to create.
280 /// @returns errc::success if is_directory(path), otherwise a platform
281 /// specific error_code. If IgnoreExisting is false, also returns
282 /// error if the directory already existed.
283 std::error_code create_directory(const Twine &path, bool IgnoreExisting = true,
284 perms Perms = owner_all | group_all);
286 /// @brief Create a link from \a from to \a to.
288 /// The link may be a soft or a hard link, depending on the platform. The caller
289 /// may not assume which one. Currently on windows it creates a hard link since
290 /// soft links require extra privileges. On unix, it creates a soft link since
291 /// hard links don't work on SMB file systems.
293 /// @param to The path to hard link to.
294 /// @param from The path to hard link from. This is created.
295 /// @returns errc::success if the link was created, otherwise a platform
296 /// specific error_code.
297 std::error_code create_link(const Twine &to, const Twine &from);
299 /// Create a hard link from \a from to \a to, or return an error.
301 /// @param to The path to hard link to.
302 /// @param from The path to hard link from. This is created.
303 /// @returns errc::success if the link was created, otherwise a platform
304 /// specific error_code.
305 std::error_code create_hard_link(const Twine &to, const Twine &from);
307 /// @brief Collapse all . and .. patterns, resolve all symlinks, and optionally
308 /// expand ~ expressions to the user's home directory.
310 /// @param path The path to resolve.
311 /// @param output The location to store the resolved path.
312 /// @param expand_tilde If true, resolves ~ expressions to the user's home
314 std::error_code real_path(const Twine &path, SmallVectorImpl<char> &output,
315 bool expand_tilde = false);
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 std::error_code current_path(SmallVectorImpl<char> &result);
324 /// @brief Set the current path.
326 /// @param path The path to set.
327 /// @returns errc::success if the current path was successfully set,
328 /// otherwise a platform-specific error_code.
329 std::error_code set_current_path(const Twine &path);
331 /// @brief Remove path. Equivalent to POSIX remove().
333 /// @param path Input path.
334 /// @returns errc::success if path has been removed or didn't exist, otherwise a
335 /// platform-specific error code. If IgnoreNonExisting is false, also
336 /// returns error if the file didn't exist.
337 std::error_code remove(const Twine &path, bool IgnoreNonExisting = true);
339 /// @brief Recursively delete a directory.
341 /// @param path Input path.
342 /// @returns errc::success if path has been removed or didn't exist, otherwise a
343 /// platform-specific error code.
344 std::error_code remove_directories(const Twine &path, bool IgnoreErrors = true);
346 /// @brief Rename \a from to \a to. Files are renamed as if by POSIX rename().
348 /// @param from The path to rename from.
349 /// @param to The path to rename to. This is created.
350 std::error_code rename(const Twine &from, const Twine &to);
352 /// @brief Copy the contents of \a From to \a To.
354 /// @param From The path to copy from.
355 /// @param To The path to copy to. This is created.
356 std::error_code copy_file(const Twine &From, const Twine &To);
358 /// @brief Resize path to size. File is resized as if by POSIX truncate().
360 /// @param FD Input file descriptor.
361 /// @param Size Size to resize to.
362 /// @returns errc::success if \a path has been resized to \a size, otherwise a
363 /// platform-specific error_code.
364 std::error_code resize_file(int FD, uint64_t Size);
366 /// @brief Compute an MD5 hash of a file's contents.
368 /// @param FD Input file descriptor.
369 /// @returns An MD5Result with the hash computed, if successful, otherwise a
371 ErrorOr<MD5::MD5Result> md5_contents(int FD);
373 /// @brief Version of compute_md5 that doesn't require an open file descriptor.
374 ErrorOr<MD5::MD5Result> md5_contents(const Twine &Path);
377 /// @name Physical Observers
380 /// @brief Does file exist?
382 /// @param status A file_status previously returned from stat.
383 /// @returns True if the file represented by status exists, false if it does
385 bool exists(file_status status);
387 enum class AccessMode { Exist, Write, Execute };
389 /// @brief Can the file be accessed?
391 /// @param Path Input path.
392 /// @returns errc::success if the path can be accessed, otherwise a
393 /// platform-specific error_code.
394 std::error_code access(const Twine &Path, AccessMode Mode);
396 /// @brief Does file exist?
398 /// @param Path Input path.
399 /// @returns True if it exists, false otherwise.
400 inline bool exists(const Twine &Path) {
401 return !access(Path, AccessMode::Exist);
404 /// @brief Can we execute this file?
406 /// @param Path Input path.
407 /// @returns True if we can execute it, false otherwise.
408 bool can_execute(const Twine &Path);
410 /// @brief Can we write this file?
412 /// @param Path Input path.
413 /// @returns True if we can write to it, false otherwise.
414 inline bool can_write(const Twine &Path) {
415 return !access(Path, AccessMode::Write);
418 /// @brief Do file_status's represent the same thing?
420 /// @param A Input file_status.
421 /// @param B Input file_status.
423 /// assert(status_known(A) || status_known(B));
425 /// @returns True if A and B both represent the same file system entity, false
427 bool equivalent(file_status A, file_status B);
429 /// @brief Do paths represent the same thing?
431 /// assert(status_known(A) || status_known(B));
433 /// @param A Input path A.
434 /// @param B Input path B.
435 /// @param result Set to true if stat(A) and stat(B) have the same device and
436 /// inode (or equivalent).
437 /// @returns errc::success if result has been successfully set, otherwise a
438 /// platform-specific error_code.
439 std::error_code equivalent(const Twine &A, const Twine &B, bool &result);
441 /// @brief Simpler version of equivalent for clients that don't need to
442 /// differentiate between an error and false.
443 inline bool equivalent(const Twine &A, const Twine &B) {
445 return !equivalent(A, B, result) && result;
448 /// @brief Is the file mounted on a local filesystem?
450 /// @param path Input path.
451 /// @param result Set to true if \a path is on fixed media such as a hard disk,
452 /// false if it is not.
453 /// @returns errc::success if result has been successfully set, otherwise a
454 /// platform specific error_code.
455 std::error_code is_local(const Twine &path, bool &result);
457 /// @brief Version of is_local accepting an open file descriptor.
458 std::error_code is_local(int FD, bool &result);
460 /// @brief Simpler version of is_local for clients that don't need to
461 /// differentiate between an error and false.
462 inline bool is_local(const Twine &Path) {
464 return !is_local(Path, Result) && Result;
467 /// @brief Simpler version of is_local accepting an open file descriptor for
468 /// clients that don't need to differentiate between an error and false.
469 inline bool is_local(int FD) {
471 return !is_local(FD, Result) && Result;
474 /// @brief Does status represent a directory?
476 /// @param Path The path to get the type of.
477 /// @param Follow For symbolic links, indicates whether to return the file type
478 /// of the link itself, or of the target.
479 /// @returns A value from the file_type enumeration indicating the type of file.
480 file_type get_file_type(const Twine &Path, bool Follow = true);
482 /// @brief Does status represent a directory?
484 /// @param status A file_status previously returned from status.
485 /// @returns status.type() == file_type::directory_file.
486 bool is_directory(file_status status);
488 /// @brief Is path a directory?
490 /// @param path Input path.
491 /// @param result Set to true if \a path is a directory (after following
492 /// symlinks, false if it is not. Undefined otherwise.
493 /// @returns errc::success if result has been successfully set, otherwise a
494 /// platform-specific error_code.
495 std::error_code is_directory(const Twine &path, bool &result);
497 /// @brief Simpler version of is_directory for clients that don't need to
498 /// differentiate between an error and false.
499 inline bool is_directory(const Twine &Path) {
501 return !is_directory(Path, Result) && Result;
504 /// @brief Does status represent a regular file?
506 /// @param status A file_status previously returned from status.
507 /// @returns status_known(status) && status.type() == file_type::regular_file.
508 bool is_regular_file(file_status status);
510 /// @brief Is path a regular file?
512 /// @param path Input path.
513 /// @param result Set to true if \a path is a regular file (after following
514 /// symlinks), false if it is not. Undefined otherwise.
515 /// @returns errc::success if result has been successfully set, otherwise a
516 /// platform-specific error_code.
517 std::error_code is_regular_file(const Twine &path, bool &result);
519 /// @brief Simpler version of is_regular_file for clients that don't need to
520 /// differentiate between an error and false.
521 inline bool is_regular_file(const Twine &Path) {
523 if (is_regular_file(Path, Result))
528 /// @brief Does status represent a symlink file?
530 /// @param status A file_status previously returned from status.
531 /// @returns status_known(status) && status.type() == file_type::symlink_file.
532 bool is_symlink_file(file_status status);
534 /// @brief Is path a symlink file?
536 /// @param path Input path.
537 /// @param result Set to true if \a path is a symlink file, false if it is not.
538 /// Undefined otherwise.
539 /// @returns errc::success if result has been successfully set, otherwise a
540 /// platform-specific error_code.
541 std::error_code is_symlink_file(const Twine &path, bool &result);
543 /// @brief Simpler version of is_symlink_file for clients that don't need to
544 /// differentiate between an error and false.
545 inline bool is_symlink_file(const Twine &Path) {
547 if (is_symlink_file(Path, Result))
552 /// @brief Does this status represent something that exists but is not a
553 /// directory or regular file?
555 /// @param status A file_status previously returned from status.
556 /// @returns exists(s) && !is_regular_file(s) && !is_directory(s)
557 bool is_other(file_status status);
559 /// @brief Is path something that exists but is not a directory,
560 /// regular file, or symlink?
562 /// @param path Input path.
563 /// @param result Set to true if \a path exists, but is not a directory, regular
564 /// file, or a symlink, false if it does not. Undefined otherwise.
565 /// @returns errc::success if result has been successfully set, otherwise a
566 /// platform-specific error_code.
567 std::error_code is_other(const Twine &path, bool &result);
569 /// @brief Get file status as if by POSIX stat().
571 /// @param path Input path.
572 /// @param result Set to the file status.
573 /// @param follow When true, follows symlinks. Otherwise, the symlink itself is
575 /// @returns errc::success if result has been successfully set, otherwise a
576 /// platform-specific error_code.
577 std::error_code status(const Twine &path, file_status &result,
580 /// @brief A version for when a file descriptor is already available.
581 std::error_code status(int FD, file_status &Result);
583 /// @brief Set file permissions.
585 /// @param Path File to set permissions on.
586 /// @param Permissions New file permissions.
587 /// @returns errc::success if the permissions were successfully set, otherwise
588 /// a platform-specific error_code.
589 /// @note On Windows, all permissions except *_write are ignored. Using any of
590 /// owner_write, group_write, or all_write will make the file writable.
591 /// Otherwise, the file will be marked as read-only.
592 std::error_code setPermissions(const Twine &Path, perms Permissions);
594 /// @brief Get file permissions.
596 /// @param Path File to get permissions from.
597 /// @returns the permissions if they were successfully retrieved, otherwise a
598 /// platform-specific error_code.
599 /// @note On Windows, if the file does not have the FILE_ATTRIBUTE_READONLY
600 /// attribute, all_all will be returned. Otherwise, all_read | all_exe
601 /// will be returned.
602 ErrorOr<perms> getPermissions(const Twine &Path);
604 /// @brief Get file size.
606 /// @param Path Input path.
607 /// @param Result Set to the size of the file in \a Path.
608 /// @returns errc::success if result has been successfully set, otherwise a
609 /// platform-specific error_code.
610 inline std::error_code file_size(const Twine &Path, uint64_t &Result) {
612 std::error_code EC = status(Path, Status);
615 Result = Status.getSize();
616 return std::error_code();
619 /// @brief Set the file modification and access time.
621 /// @returns errc::success if the file times were successfully set, otherwise a
622 /// platform-specific error_code or errc::function_not_supported on
623 /// platforms where the functionality isn't available.
624 std::error_code setLastModificationAndAccessTime(int FD, TimePoint<> Time);
626 /// @brief Is status available?
628 /// @param s Input file status.
629 /// @returns True if status() != status_error.
630 bool status_known(file_status s);
632 /// @brief Is status available?
634 /// @param path Input path.
635 /// @param result Set to true if status() != status_error.
636 /// @returns errc::success if result has been successfully set, otherwise a
637 /// platform-specific error_code.
638 std::error_code status_known(const Twine &path, bool &result);
640 /// @brief Create a uniquely named file.
642 /// Generates a unique path suitable for a temporary file and then opens it as a
643 /// file. The name is based on \a model with '%' replaced by a random char in
644 /// [0-9a-f]. If \a model is not an absolute path, the temporary file will be
645 /// created in the current directory.
647 /// Example: clang-%%-%%-%%-%%-%%.s => clang-a0-b1-c2-d3-e4.s
649 /// This is an atomic operation. Either the file is created and opened, or the
650 /// file system is left untouched.
652 /// The intended use is for files that are to be kept, possibly after
653 /// renaming them. For example, when running 'clang -c foo.o', the file can
654 /// be first created as foo-abc123.o and then renamed.
656 /// @param Model Name to base unique path off of.
657 /// @param ResultFD Set to the opened file's file descriptor.
658 /// @param ResultPath Set to the opened file's absolute path.
659 /// @returns errc::success if Result{FD,Path} have been successfully set,
660 /// otherwise a platform-specific error_code.
661 std::error_code createUniqueFile(const Twine &Model, int &ResultFD,
662 SmallVectorImpl<char> &ResultPath,
663 unsigned Mode = all_read | all_write);
665 /// @brief Simpler version for clients that don't want an open file.
666 std::error_code createUniqueFile(const Twine &Model,
667 SmallVectorImpl<char> &ResultPath);
669 /// @brief Create a file in the system temporary directory.
671 /// The filename is of the form prefix-random_chars.suffix. Since the directory
672 /// is not know to the caller, Prefix and Suffix cannot have path separators.
673 /// The files are created with mode 0600.
675 /// This should be used for things like a temporary .s that is removed after
676 /// running the assembler.
677 std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
679 SmallVectorImpl<char> &ResultPath);
681 /// @brief Simpler version for clients that don't want an open file.
682 std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
683 SmallVectorImpl<char> &ResultPath);
685 std::error_code createUniqueDirectory(const Twine &Prefix,
686 SmallVectorImpl<char> &ResultPath);
688 /// @brief Fetch a path to an open file, as specified by a file descriptor
690 /// @param FD File descriptor to a currently open file
691 /// @param ResultPath The buffer into which to write the path
692 std::error_code getPathFromOpenFD(int FD, SmallVectorImpl<char> &ResultPath);
694 enum OpenFlags : unsigned {
697 /// F_Excl - When opening a file, this flag makes raw_fd_ostream
698 /// report an error if the file already exists.
701 /// F_Append - When opening a file, if it already exists append to the
702 /// existing file instead of returning an error. This may not be specified
706 /// The file should be opened in text mode on platforms that make this
710 /// Open the file for read and write.
714 inline OpenFlags operator|(OpenFlags A, OpenFlags B) {
715 return OpenFlags(unsigned(A) | unsigned(B));
718 inline OpenFlags &operator|=(OpenFlags &A, OpenFlags B) {
723 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
724 OpenFlags Flags, unsigned Mode = 0666);
726 std::error_code openFileForRead(const Twine &Name, int &ResultFD,
727 SmallVectorImpl<char> *RealPath = nullptr);
729 std::error_code getUniqueID(const Twine Path, UniqueID &Result);
731 /// @brief Get disk space usage information.
733 /// Note: Users must be careful about "Time Of Check, Time Of Use" kind of bug.
734 /// Note: Windows reports results according to the quota allocated to the user.
736 /// @param Path Input path.
737 /// @returns a space_info structure filled with the capacity, free, and
738 /// available space on the device \a Path is on. A platform specific error_code
739 /// is returned on error.
740 ErrorOr<space_info> disk_space(const Twine &Path);
742 /// This class represents a memory mapped file. It is based on
743 /// boost::iostreams::mapped_file.
744 class mapped_file_region {
747 readonly, ///< May only access map via const_data as read only.
748 readwrite, ///< May access map via data and modify it. Written to path.
749 priv ///< May modify via data, but changes are lost on destruction.
753 /// Platform-specific mapping state.
757 std::error_code init(int FD, uint64_t Offset, mapmode Mode);
760 mapped_file_region() = delete;
761 mapped_file_region(mapped_file_region&) = delete;
762 mapped_file_region &operator =(mapped_file_region&) = delete;
764 /// \param fd An open file descriptor to map. mapped_file_region takes
765 /// ownership if closefd is true. It must have been opended in the correct
767 mapped_file_region(int fd, mapmode mode, uint64_t length, uint64_t offset,
768 std::error_code &ec);
770 ~mapped_file_region();
772 uint64_t size() const;
775 /// Get a const view of the data. Modifying this memory has undefined
777 const char *const_data() const;
779 /// \returns The minimum alignment offset must be.
780 static int alignment();
783 /// Return the path to the main executable, given the value of argv[0] from
784 /// program startup and the address of main itself. In extremis, this function
785 /// may fail and return an empty path.
786 std::string getMainExecutable(const char *argv0, void *MainExecAddr);
792 /// directory_entry - A single entry in a directory. Caches the status either
793 /// from the result of the iteration syscall, or the first time status is
795 class directory_entry {
798 mutable file_status Status;
801 explicit directory_entry(const Twine &path, bool follow_symlinks = true,
802 file_status st = file_status())
803 : Path(path.str()), FollowSymlinks(follow_symlinks), Status(st) {}
805 directory_entry() = default;
807 void assign(const Twine &path, file_status st = file_status()) {
812 void replace_filename(const Twine &filename, file_status st = file_status());
814 const std::string &path() const { return Path; }
815 std::error_code status(file_status &result) const;
817 bool operator==(const directory_entry& rhs) const { return Path == rhs.Path; }
818 bool operator!=(const directory_entry& rhs) const { return !(*this == rhs); }
819 bool operator< (const directory_entry& rhs) const;
820 bool operator<=(const directory_entry& rhs) const;
821 bool operator> (const directory_entry& rhs) const;
822 bool operator>=(const directory_entry& rhs) const;
829 std::error_code directory_iterator_construct(DirIterState &, StringRef, bool);
830 std::error_code directory_iterator_increment(DirIterState &);
831 std::error_code directory_iterator_destruct(DirIterState &);
833 /// Keeps state for the directory_iterator.
834 struct DirIterState {
836 directory_iterator_destruct(*this);
839 intptr_t IterationHandle = 0;
840 directory_entry CurrentEntry;
843 } // end namespace detail
845 /// directory_iterator - Iterates through the entries in path. There is no
846 /// operator++ because we need an error_code. If it's really needed we can make
847 /// it call report_fatal_error on error.
848 class directory_iterator {
849 std::shared_ptr<detail::DirIterState> State;
850 bool FollowSymlinks = true;
853 explicit directory_iterator(const Twine &path, std::error_code &ec,
854 bool follow_symlinks = true)
855 : FollowSymlinks(follow_symlinks) {
856 State = std::make_shared<detail::DirIterState>();
857 SmallString<128> path_storage;
858 ec = detail::directory_iterator_construct(
859 *State, path.toStringRef(path_storage), FollowSymlinks);
862 explicit directory_iterator(const directory_entry &de, std::error_code &ec,
863 bool follow_symlinks = true)
864 : FollowSymlinks(follow_symlinks) {
865 State = std::make_shared<detail::DirIterState>();
867 detail::directory_iterator_construct(*State, de.path(), FollowSymlinks);
870 /// Construct end iterator.
871 directory_iterator() = default;
873 // No operator++ because we need error_code.
874 directory_iterator &increment(std::error_code &ec) {
875 ec = directory_iterator_increment(*State);
879 const directory_entry &operator*() const { return State->CurrentEntry; }
880 const directory_entry *operator->() const { return &State->CurrentEntry; }
882 bool operator==(const directory_iterator &RHS) const {
883 if (State == RHS.State)
886 return State->CurrentEntry == directory_entry();
888 return RHS.State->CurrentEntry == directory_entry();
889 return State->CurrentEntry == RHS.State->CurrentEntry;
892 bool operator!=(const directory_iterator &RHS) const {
893 return !(*this == RHS);
895 // Other members as required by
896 // C++ Std, 24.1.1 Input iterators [input.iterators]
901 /// Keeps state for the recursive_directory_iterator.
902 struct RecDirIterState {
903 std::stack<directory_iterator, std::vector<directory_iterator>> Stack;
905 bool HasNoPushRequest = false;
908 } // end namespace detail
910 /// recursive_directory_iterator - Same as directory_iterator except for it
911 /// recurses down into child directories.
912 class recursive_directory_iterator {
913 std::shared_ptr<detail::RecDirIterState> State;
917 recursive_directory_iterator() = default;
918 explicit recursive_directory_iterator(const Twine &path, std::error_code &ec,
919 bool follow_symlinks = true)
920 : State(std::make_shared<detail::RecDirIterState>()),
921 Follow(follow_symlinks) {
922 State->Stack.push(directory_iterator(path, ec, Follow));
923 if (State->Stack.top() == directory_iterator())
927 // No operator++ because we need error_code.
928 recursive_directory_iterator &increment(std::error_code &ec) {
929 const directory_iterator end_itr = {};
931 if (State->HasNoPushRequest)
932 State->HasNoPushRequest = false;
935 if ((ec = State->Stack.top()->status(st))) return *this;
936 if (is_directory(st)) {
937 State->Stack.push(directory_iterator(*State->Stack.top(), ec, Follow));
938 if (ec) return *this;
939 if (State->Stack.top() != end_itr) {
947 while (!State->Stack.empty()
948 && State->Stack.top().increment(ec) == end_itr) {
953 // Check if we are done. If so, create an end iterator.
954 if (State->Stack.empty())
960 const directory_entry &operator*() const { return *State->Stack.top(); }
961 const directory_entry *operator->() const { return &*State->Stack.top(); }
964 /// Gets the current level. Starting path is at level 0.
965 int level() const { return State->Level; }
967 /// Returns true if no_push has been called for this directory_entry.
968 bool no_push_request() const { return State->HasNoPushRequest; }
971 /// Goes up one level if Level > 0.
973 assert(State && "Cannot pop an end iterator!");
974 assert(State->Level > 0 && "Cannot pop an iterator with level < 1");
976 const directory_iterator end_itr = {};
980 report_fatal_error("Error incrementing directory iterator.");
983 } while (!State->Stack.empty()
984 && State->Stack.top().increment(ec) == end_itr);
986 // Check if we are done. If so, create an end iterator.
987 if (State->Stack.empty())
991 /// Does not go down into the current directory_entry.
992 void no_push() { State->HasNoPushRequest = true; }
994 bool operator==(const recursive_directory_iterator &RHS) const {
995 return State == RHS.State;
998 bool operator!=(const recursive_directory_iterator &RHS) const {
999 return !(*this == RHS);
1001 // Other members as required by
1002 // C++ Std, 24.1.1 Input iterators [input.iterators]
1007 } // end namespace fs
1008 } // end namespace sys
1009 } // end namespace llvm
1011 #endif // LLVM_SUPPORT_FILESYSTEM_H