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/OwningPtr.h"
32 #include "llvm/ADT/SmallString.h"
33 #include "llvm/ADT/Twine.h"
34 #include "llvm/Support/DataTypes.h"
35 #include "llvm/Support/ErrorHandling.h"
36 #include "llvm/Support/TimeValue.h"
37 #include "llvm/Support/system_error.h"
44 #ifdef HAVE_SYS_STAT_H
52 /// file_type - An "enum class" enumeration for the file system's view of the
68 file_type(_ v) : v_(v) {}
69 explicit file_type(int v) : v_(_(v)) {}
70 operator int() const {return v_;}
76 /// copy_option - An "enum class" enumeration of copy semantics for copy
84 copy_option(_ v) : v_(v) {}
85 explicit copy_option(int v) : v_(_(v)) {}
86 operator int() const {return v_;}
92 /// space_info - Self explanatory.
105 owner_all = owner_read | owner_write | owner_exe,
109 group_all = group_read | group_write | group_exe,
113 others_all = others_read | others_write | others_exe,
114 all_read = owner_read | group_read | others_read,
115 all_write = owner_write | group_write | others_write,
116 all_exe = owner_exe | group_exe | others_exe,
117 all_all = owner_all | group_all | others_all,
118 set_uid_on_exe = 04000,
119 set_gid_on_exe = 02000,
121 perms_not_known = 0xFFFF
124 // Helper functions so that you can use & and | to manipulate perms bits:
125 inline perms operator|(perms l , perms r) {
126 return static_cast<perms>(
127 static_cast<unsigned short>(l) | static_cast<unsigned short>(r));
129 inline perms operator&(perms l , perms r) {
130 return static_cast<perms>(
131 static_cast<unsigned short>(l) & static_cast<unsigned short>(r));
133 inline perms &operator|=(perms &l, perms r) {
137 inline perms &operator&=(perms &l, perms r) {
141 inline perms operator~(perms x) {
142 return static_cast<perms>(~static_cast<unsigned short>(x));
147 /// file_status - Represents the result of a call to stat and friends. It has
148 /// a platform specific member to store the result.
151 #if defined(LLVM_ON_UNIX)
157 #elif defined (LLVM_ON_WIN32)
158 uint32_t LastWriteTimeHigh;
159 uint32_t LastWriteTimeLow;
160 uint32_t VolumeSerialNumber;
161 uint32_t FileSizeHigh;
162 uint32_t FileSizeLow;
163 uint32_t FileIndexHigh;
164 uint32_t FileIndexLow;
166 friend bool equivalent(file_status A, file_status B);
167 friend error_code status(const Twine &path, file_status &result);
168 friend error_code getUniqueID(const Twine Path, uint64_t &Result);
172 explicit file_status(file_type v=file_type::status_error,
173 perms prms=perms_not_known)
174 : Type(v), Perms(prms) {}
177 file_type type() const { return Type; }
178 perms permissions() const { return Perms; }
179 TimeValue getLastModificationTime() const;
181 #if defined(LLVM_ON_UNIX)
182 uint32_t getUser() const { return fs_st_uid; }
183 uint32_t getGroup() const { return fs_st_gid; }
184 #elif defined (LLVM_ON_WIN32)
185 uint32_t getUser() const {
186 return 9999; // Not applicable to Windows, so...
188 uint32_t getGroup() const {
189 return 9999; // Not applicable to Windows, so...
194 void type(file_type v) { Type = v; }
195 void permissions(perms p) { Perms = p; }
198 /// file_magic - An "enum class" enumeration of file types based on magic (the first
199 /// N bytes of the file).
202 unknown = 0, ///< Unrecognized file
203 bitcode, ///< Bitcode file
204 archive, ///< ar style archive file
205 elf_relocatable, ///< ELF Relocatable object file
206 elf_executable, ///< ELF Executable image
207 elf_shared_object, ///< ELF dynamically linked shared lib
208 elf_core, ///< ELF core image
209 macho_object, ///< Mach-O Object file
210 macho_executable, ///< Mach-O Executable
211 macho_fixed_virtual_memory_shared_lib, ///< Mach-O Shared Lib, FVM
212 macho_core, ///< Mach-O Core File
213 macho_preload_executable, ///< Mach-O Preloaded Executable
214 macho_dynamically_linked_shared_lib, ///< Mach-O dynlinked shared lib
215 macho_dynamic_linker, ///< The Mach-O dynamic linker
216 macho_bundle, ///< Mach-O Bundle file
217 macho_dynamically_linked_shared_lib_stub, ///< Mach-O Shared lib stub
218 macho_dsym_companion, ///< Mach-O dSYM companion file
219 macho_universal_binary, ///< Mach-O universal binary
220 coff_object, ///< COFF object file
221 pecoff_executable ///< PECOFF executable file
224 bool is_object() const {
225 return V == unknown ? false : true;
228 file_magic() : V(unknown) {}
229 file_magic(Impl V) : V(V) {}
230 operator Impl() const { return V; }
237 /// @name Physical Operators
240 /// @brief Make \a path an absolute path.
242 /// Makes \a path absolute using the current directory if it is not already. An
243 /// empty \a path will result in the 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 error_code make_absolute(SmallVectorImpl<char> &path);
253 /// @brief Copy the file at \a from to the path \a to.
255 /// @param from The path to copy the file from.
256 /// @param to The path to copy the file to.
257 /// @param copt Behavior if \a to already exists.
258 /// @returns errc::success if the file has been successfully copied.
259 /// errc::file_exists if \a to already exists and \a copt ==
260 /// copy_option::fail_if_exists. Otherwise a platform specific
262 error_code copy_file(const Twine &from, const Twine &to,
263 copy_option copt = copy_option::fail_if_exists);
265 /// @brief Create all the non-existent directories in path.
267 /// @param path Directories to create.
268 /// @param existed Set to true if \a path already existed, false otherwise.
269 /// @returns errc::success if is_directory(path) and existed have been set,
270 /// otherwise a platform specific error_code.
271 error_code create_directories(const Twine &path, bool &existed);
273 /// @brief Convenience function for clients that don't need to know if the
274 /// directory existed or not.
275 inline error_code create_directories(const Twine &Path) {
277 return create_directories(Path, Existed);
280 /// @brief Create the directory in path.
282 /// @param path Directory to create.
283 /// @param existed Set to true if \a path already existed, false otherwise.
284 /// @returns errc::success if is_directory(path) and existed have been set,
285 /// otherwise a platform specific error_code.
286 error_code create_directory(const Twine &path, bool &existed);
288 /// @brief Convenience function for clients that don't need to know if the
289 /// directory existed or not.
290 inline error_code create_directory(const Twine &Path) {
292 return create_directory(Path, Existed);
295 /// @brief Create a hard link from \a from to \a to.
297 /// @param to The path to hard link to.
298 /// @param from The path to hard link from. This is created.
299 /// @returns errc::success if exists(to) && exists(from) && equivalent(to, from)
300 /// , otherwise a platform specific error_code.
301 error_code create_hard_link(const Twine &to, const Twine &from);
303 /// @brief Create a symbolic link from \a from to \a to.
305 /// @param to The path to symbolically link to.
306 /// @param from The path to symbolically link from. This is created.
307 /// @returns errc::success if exists(to) && exists(from) && is_symlink(from),
308 /// otherwise a platform specific error_code.
309 error_code create_symlink(const Twine &to, const Twine &from);
311 /// @brief Get the current path.
313 /// @param result Holds the current path on return.
314 /// @returns errc::success if the current path has been stored in result,
315 /// otherwise a platform specific error_code.
316 error_code current_path(SmallVectorImpl<char> &result);
318 /// @brief Remove path. Equivalent to POSIX remove().
320 /// @param path Input path.
321 /// @param existed Set to true if \a path existed, false if it did not.
322 /// undefined otherwise.
323 /// @returns errc::success if path has been removed and existed has been
324 /// successfully set, otherwise a platform specific error_code.
325 error_code remove(const Twine &path, bool &existed);
327 /// @brief Convenience function for clients that don't need to know if the file
329 inline error_code remove(const Twine &Path) {
331 return remove(Path, Existed);
334 /// @brief Recursively remove all files below \a path, then \a path. Files are
335 /// removed as if by POSIX remove().
337 /// @param path Input path.
338 /// @param num_removed Number of files removed.
339 /// @returns errc::success if path has been removed and num_removed has been
340 /// successfully set, otherwise a platform specific error_code.
341 error_code remove_all(const Twine &path, uint32_t &num_removed);
343 /// @brief Convenience function for clients that don't need to know how many
344 /// files were removed.
345 inline error_code remove_all(const Twine &Path) {
347 return remove_all(Path, Removed);
350 /// @brief Rename \a from to \a to. Files are renamed as if by POSIX rename().
352 /// @param from The path to rename from.
353 /// @param to The path to rename to. This is created.
354 error_code rename(const Twine &from, const Twine &to);
356 /// @brief Resize path to size. File is resized as if by POSIX truncate().
358 /// @param path Input path.
359 /// @param size Size to resize to.
360 /// @returns errc::success if \a path has been resized to \a size, otherwise a
361 /// platform specific error_code.
362 error_code resize_file(const Twine &path, uint64_t size);
365 /// @name Physical Observers
368 /// @brief Does file exist?
370 /// @param status A file_status previously returned from stat.
371 /// @returns True if the file represented by status exists, false if it does
373 bool exists(file_status status);
375 /// @brief Does file exist?
377 /// @param path Input path.
378 /// @param result Set to true if the file represented by status exists, false if
379 /// it does not. Undefined otherwise.
380 /// @returns errc::success if result has been successfully set, otherwise a
381 /// platform specific error_code.
382 error_code exists(const Twine &path, bool &result);
384 /// @brief Simpler version of exists for clients that don't need to
385 /// differentiate between an error and false.
386 inline bool exists(const Twine &path) {
388 return !exists(path, result) && result;
391 /// @brief Can we execute this file?
393 /// @param Path Input path.
394 /// @returns True if we can execute it, false otherwise.
395 bool can_execute(const Twine &Path);
397 /// @brief Can we write this file?
399 /// @param Path Input path.
400 /// @returns True if we can write to it, false otherwise.
401 bool can_write(const Twine &Path);
403 /// @brief Do file_status's represent the same thing?
405 /// @param A Input file_status.
406 /// @param B Input file_status.
408 /// assert(status_known(A) || status_known(B));
410 /// @returns True if A and B both represent the same file system entity, false
412 bool equivalent(file_status A, file_status B);
414 /// @brief Do paths represent the same thing?
416 /// assert(status_known(A) || status_known(B));
418 /// @param A Input path A.
419 /// @param B Input path B.
420 /// @param result Set to true if stat(A) and stat(B) have the same device and
421 /// inode (or equivalent).
422 /// @returns errc::success if result has been successfully set, otherwise a
423 /// platform specific error_code.
424 error_code equivalent(const Twine &A, const Twine &B, bool &result);
426 /// @brief Simpler version of equivalent for clients that don't need to
427 /// differentiate between an error and false.
428 inline bool equivalent(const Twine &A, const Twine &B) {
430 return !equivalent(A, B, result) && result;
433 /// @brief Get file size.
435 /// @param path Input path.
436 /// @param result Set to the size of the file in \a path.
437 /// @returns errc::success if result has been successfully set, otherwise a
438 /// platform specific error_code.
439 error_code file_size(const Twine &path, uint64_t &result);
441 /// @brief Does status represent a directory?
443 /// @param status A file_status previously returned from status.
444 /// @returns status.type() == file_type::directory_file.
445 bool is_directory(file_status status);
447 /// @brief Is path a directory?
449 /// @param path Input path.
450 /// @param result Set to true if \a path is a directory, false if it is not.
451 /// Undefined otherwise.
452 /// @returns errc::success if result has been successfully set, otherwise a
453 /// platform specific error_code.
454 error_code is_directory(const Twine &path, bool &result);
456 /// @brief Does status represent a regular file?
458 /// @param status A file_status previously returned from status.
459 /// @returns status_known(status) && status.type() == file_type::regular_file.
460 bool is_regular_file(file_status status);
462 /// @brief Is path a regular file?
464 /// @param path Input path.
465 /// @param result Set to true if \a path is a regular file, false if it is not.
466 /// Undefined otherwise.
467 /// @returns errc::success if result has been successfully set, otherwise a
468 /// platform specific error_code.
469 error_code is_regular_file(const Twine &path, bool &result);
471 /// @brief Simpler version of is_regular_file for clients that don't need to
472 /// differentiate between an error and false.
473 inline bool is_regular_file(const Twine &Path) {
475 if (is_regular_file(Path, Result))
480 /// @brief Does this status represent something that exists but is not a
481 /// directory, regular file, or symlink?
483 /// @param status A file_status previously returned from status.
484 /// @returns exists(s) && !is_regular_file(s) && !is_directory(s) &&
486 bool is_other(file_status status);
488 /// @brief Is path something that exists but is not a directory,
489 /// regular file, or symlink?
491 /// @param path Input path.
492 /// @param result Set to true if \a path exists, but is not a directory, regular
493 /// file, or a symlink, false if it does not. Undefined otherwise.
494 /// @returns errc::success if result has been successfully set, otherwise a
495 /// platform specific error_code.
496 error_code is_other(const Twine &path, bool &result);
498 /// @brief Does status represent a symlink?
500 /// @param status A file_status previously returned from stat.
501 /// @returns status.type() == symlink_file.
502 bool is_symlink(file_status status);
504 /// @brief Is path a symlink?
506 /// @param path Input path.
507 /// @param result Set to true if \a path is a symlink, false if it is not.
508 /// Undefined otherwise.
509 /// @returns errc::success if result has been successfully set, otherwise a
510 /// platform specific error_code.
511 error_code is_symlink(const Twine &path, bool &result);
513 /// @brief Get file status as if by POSIX stat().
515 /// @param path Input path.
516 /// @param result Set to the file status.
517 /// @returns errc::success if result has been successfully set, otherwise a
518 /// platform specific error_code.
519 error_code status(const Twine &path, file_status &result);
521 error_code setLastModificationAndAccessTime(int FD, TimeValue Time);
523 /// @brief Is status available?
525 /// @param s Input file status.
526 /// @returns True if status() != status_error.
527 bool status_known(file_status s);
529 /// @brief Is status available?
531 /// @param path Input path.
532 /// @param result Set to true if status() != status_error.
533 /// @returns errc::success if result has been successfully set, otherwise a
534 /// platform specific error_code.
535 error_code status_known(const Twine &path, bool &result);
537 /// @brief Create a uniquely named file.
539 /// Generates a unique path suitable for a temporary file and then opens it as a
540 /// file. The name is based on \a model with '%' replaced by a random char in
541 /// [0-9a-f]. If \a model is not an absolute path, a suitable temporary
542 /// directory will be prepended.
544 /// Example: clang-%%-%%-%%-%%-%%.s => clang-a0-b1-c2-d3-e4.s
546 /// This is an atomic operation. Either the file is created and opened, or the
547 /// file system is left untouched.
549 /// The intendend use is for files that are to be kept, possibly after
550 /// renaming them. For example, when running 'clang -c foo.o', the file can
551 /// be first created as foo-abc123.o and then renamed.
553 /// @param Model Name to base unique path off of.
554 /// @param ResultFD Set to the opened file's file descriptor.
555 /// @param ResultPath Set to the opened file's absolute path.
556 /// @returns errc::success if Result{FD,Path} have been successfully set,
557 /// otherwise a platform specific error_code.
558 error_code createUniqueFile(const Twine &Model, int &ResultFD,
559 SmallVectorImpl<char> &ResultPath,
560 unsigned Mode = all_read | all_write);
562 /// @brief Simpler version for clients that don't want an open file.
563 error_code createUniqueFile(const Twine &Model,
564 SmallVectorImpl<char> &ResultPath);
566 /// @brief Create a file in the system temporary directory.
568 /// The filename is of the form prefix-random_chars.suffix. Since the directory
569 /// is not know to the caller, Prefix and Suffix cannot have path separators.
570 /// The files are created with mode 0600.
572 /// This should be used for things like a temporary .s that is removed after
573 /// running the assembler.
574 error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
576 SmallVectorImpl<char> &ResultPath);
578 /// @brief Simpler version for clients that don't want an open file.
579 error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
580 SmallVectorImpl<char> &ResultPath);
582 error_code createUniqueDirectory(const Twine &Prefix,
583 SmallVectorImpl<char> &ResultPath);
585 /// @brief Canonicalize path.
587 /// Sets result to the file system's idea of what path is. The result is always
588 /// absolute and has the same capitalization as the file system.
590 /// @param path Input path.
591 /// @param result Set to the canonicalized version of \a path.
592 /// @returns errc::success if result has been successfully set, otherwise a
593 /// platform specific error_code.
594 error_code canonicalize(const Twine &path, SmallVectorImpl<char> &result);
596 /// @brief Are \a path's first bytes \a magic?
598 /// @param path Input path.
599 /// @param magic Byte sequence to compare \a path's first len(magic) bytes to.
600 /// @returns errc::success if result has been successfully set, otherwise a
601 /// platform specific error_code.
602 error_code has_magic(const Twine &path, const Twine &magic, bool &result);
604 /// @brief Get \a path's first \a len bytes.
606 /// @param path Input path.
607 /// @param len Number of magic bytes to get.
608 /// @param result Set to the first \a len bytes in the file pointed to by
609 /// \a path. Or the entire file if file_size(path) < len, in which
610 /// case result.size() returns the size of the file.
611 /// @returns errc::success if result has been successfully set,
612 /// errc::value_too_large if len is larger then the file pointed to by
613 /// \a path, otherwise a platform specific error_code.
614 error_code get_magic(const Twine &path, uint32_t len,
615 SmallVectorImpl<char> &result);
617 /// @brief Identify the type of a binary file based on how magical it is.
618 file_magic identify_magic(StringRef magic);
620 /// @brief Get and identify \a path's type based on its content.
622 /// @param path Input path.
623 /// @param result Set to the type of file, or file_magic::unknown.
624 /// @returns errc::success if result has been successfully set, otherwise a
625 /// platform specific error_code.
626 error_code identify_magic(const Twine &path, file_magic &result);
628 error_code getUniqueID(const Twine Path, uint64_t &Result);
630 /// This class represents a memory mapped file. It is based on
631 /// boost::iostreams::mapped_file.
632 class mapped_file_region {
633 mapped_file_region() LLVM_DELETED_FUNCTION;
634 mapped_file_region(mapped_file_region&) LLVM_DELETED_FUNCTION;
635 mapped_file_region &operator =(mapped_file_region&) LLVM_DELETED_FUNCTION;
639 readonly, ///< May only access map via const_data as read only.
640 readwrite, ///< May access map via data and modify it. Written to path.
641 priv ///< May modify via data, but changes are lost on destruction.
645 /// Platform specific mapping state.
652 void *FileMappingHandle;
655 error_code init(int FD, bool CloseFD, uint64_t Offset);
658 typedef char char_type;
660 #if LLVM_HAS_RVALUE_REFERENCES
661 mapped_file_region(mapped_file_region&&);
662 mapped_file_region &operator =(mapped_file_region&&);
665 /// Construct a mapped_file_region at \a path starting at \a offset of length
666 /// \a length and with access \a mode.
668 /// \param path Path to the file to map. If it does not exist it will be
670 /// \param mode How to map the memory.
671 /// \param length Number of bytes to map in starting at \a offset. If the file
672 /// is shorter than this, it will be extended. If \a length is
673 /// 0, the entire file will be mapped.
674 /// \param offset Byte offset from the beginning of the file where the map
675 /// should begin. Must be a multiple of
676 /// mapped_file_region::alignment().
677 /// \param ec This is set to errc::success if the map was constructed
678 /// sucessfully. Otherwise it is set to a platform dependent error.
679 mapped_file_region(const Twine &path,
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,
695 ~mapped_file_region();
697 mapmode flags() const;
698 uint64_t size() const;
701 /// Get a const view of the data. Modifying this memory has undefined
703 const char *const_data() const;
705 /// \returns The minimum alignment offset must be.
706 static int alignment();
709 /// @brief Memory maps the contents of a file
711 /// @param path Path to file to map.
712 /// @param file_offset Byte offset in file where mapping should begin.
713 /// @param size Byte length of range of the file to map.
714 /// @param map_writable If true, the file will be mapped in r/w such
715 /// that changes to the mapped buffer will be flushed back
716 /// to the file. If false, the file will be mapped read-only
717 /// and the buffer will be read-only.
718 /// @param result Set to the start address of the mapped buffer.
719 /// @returns errc::success if result has been successfully set, otherwise a
720 /// platform specific error_code.
721 error_code map_file_pages(const Twine &path, off_t file_offset, size_t size,
722 bool map_writable, void *&result);
725 /// @brief Memory unmaps the contents of a file
727 /// @param base Pointer to the start of the buffer.
728 /// @param size Byte length of the range to unmmap.
729 /// @returns errc::success if result has been successfully set, otherwise a
730 /// platform specific error_code.
731 error_code unmap_file_pages(void *base, size_t size);
733 /// Return the path to the main executable, given the value of argv[0] from
734 /// program startup and the address of main itself. In extremis, this function
735 /// may fail and return an empty path.
736 std::string getMainExecutable(const char *argv0, void *MainExecAddr);
742 /// directory_entry - A single entry in a directory. Caches the status either
743 /// from the result of the iteration syscall, or the first time status is
745 class directory_entry {
747 mutable file_status Status;
750 explicit directory_entry(const Twine &path, file_status st = file_status())
756 void assign(const Twine &path, file_status st = file_status()) {
761 void replace_filename(const Twine &filename, file_status st = file_status());
763 const std::string &path() const { return Path; }
764 error_code status(file_status &result) const;
766 bool operator==(const directory_entry& rhs) const { return Path == rhs.Path; }
767 bool operator!=(const directory_entry& rhs) const { return !(*this == rhs); }
768 bool operator< (const directory_entry& rhs) const;
769 bool operator<=(const directory_entry& rhs) const;
770 bool operator> (const directory_entry& rhs) const;
771 bool operator>=(const directory_entry& rhs) const;
777 error_code directory_iterator_construct(DirIterState&, StringRef);
778 error_code directory_iterator_increment(DirIterState&);
779 error_code directory_iterator_destruct(DirIterState&);
781 /// DirIterState - Keeps state for the directory_iterator. It is reference
782 /// counted in order to preserve InputIterator semantics on copy.
783 struct DirIterState : public RefCountedBase<DirIterState> {
785 : IterationHandle(0) {}
788 directory_iterator_destruct(*this);
791 intptr_t IterationHandle;
792 directory_entry CurrentEntry;
796 /// directory_iterator - Iterates through the entries in path. There is no
797 /// operator++ because we need an error_code. If it's really needed we can make
798 /// it call report_fatal_error on error.
799 class directory_iterator {
800 IntrusiveRefCntPtr<detail::DirIterState> State;
803 explicit directory_iterator(const Twine &path, error_code &ec) {
804 State = new detail::DirIterState;
805 SmallString<128> path_storage;
806 ec = detail::directory_iterator_construct(*State,
807 path.toStringRef(path_storage));
810 explicit directory_iterator(const directory_entry &de, error_code &ec) {
811 State = new detail::DirIterState;
812 ec = detail::directory_iterator_construct(*State, de.path());
815 /// Construct end iterator.
816 directory_iterator() : State(new detail::DirIterState) {}
818 // No operator++ because we need error_code.
819 directory_iterator &increment(error_code &ec) {
820 ec = directory_iterator_increment(*State);
824 const directory_entry &operator*() const { return State->CurrentEntry; }
825 const directory_entry *operator->() const { return &State->CurrentEntry; }
827 bool operator==(const directory_iterator &RHS) const {
828 return State->CurrentEntry == RHS.State->CurrentEntry;
831 bool operator!=(const directory_iterator &RHS) const {
832 return !(*this == RHS);
834 // Other members as required by
835 // C++ Std, 24.1.1 Input iterators [input.iterators]
839 /// RecDirIterState - Keeps state for the recursive_directory_iterator. It is
840 /// reference counted in order to preserve InputIterator semantics on copy.
841 struct RecDirIterState : public RefCountedBase<RecDirIterState> {
844 , HasNoPushRequest(false) {}
846 std::stack<directory_iterator, std::vector<directory_iterator> > Stack;
848 bool HasNoPushRequest;
852 /// recursive_directory_iterator - Same as directory_iterator except for it
853 /// recurses down into child directories.
854 class recursive_directory_iterator {
855 IntrusiveRefCntPtr<detail::RecDirIterState> State;
858 recursive_directory_iterator() {}
859 explicit recursive_directory_iterator(const Twine &path, error_code &ec)
860 : State(new detail::RecDirIterState) {
861 State->Stack.push(directory_iterator(path, ec));
862 if (State->Stack.top() == directory_iterator())
865 // No operator++ because we need error_code.
866 recursive_directory_iterator &increment(error_code &ec) {
867 static const directory_iterator end_itr;
869 if (State->HasNoPushRequest)
870 State->HasNoPushRequest = false;
873 if ((ec = State->Stack.top()->status(st))) return *this;
874 if (is_directory(st)) {
875 State->Stack.push(directory_iterator(*State->Stack.top(), ec));
876 if (ec) return *this;
877 if (State->Stack.top() != end_itr) {
885 while (!State->Stack.empty()
886 && State->Stack.top().increment(ec) == end_itr) {
891 // Check if we are done. If so, create an end iterator.
892 if (State->Stack.empty())
898 const directory_entry &operator*() const { return *State->Stack.top(); }
899 const directory_entry *operator->() const { return &*State->Stack.top(); }
902 /// Gets the current level. Starting path is at level 0.
903 int level() const { return State->Level; }
905 /// Returns true if no_push has been called for this directory_entry.
906 bool no_push_request() const { return State->HasNoPushRequest; }
909 /// Goes up one level if Level > 0.
911 assert(State && "Cannot pop and end itertor!");
912 assert(State->Level > 0 && "Cannot pop an iterator with level < 1");
914 static const directory_iterator end_itr;
918 report_fatal_error("Error incrementing directory iterator.");
921 } while (!State->Stack.empty()
922 && State->Stack.top().increment(ec) == end_itr);
924 // Check if we are done. If so, create an end iterator.
925 if (State->Stack.empty())
929 /// Does not go down into the current directory_entry.
930 void no_push() { State->HasNoPushRequest = true; }
932 bool operator==(const recursive_directory_iterator &RHS) const {
933 return State == RHS.State;
936 bool operator!=(const recursive_directory_iterator &RHS) const {
937 return !(*this == RHS);
939 // Other members as required by
940 // C++ Std, 24.1.1 Input iterators [input.iterators]
945 } // end namespace fs
946 } // end namespace sys
947 } // end namespace llvm