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/system_error.h"
43 #ifdef HAVE_SYS_STAT_H
51 /// file_type - An "enum class" enumeration for the file system's view of the
67 file_type(_ v) : v_(v) {}
68 explicit file_type(int v) : v_(_(v)) {}
69 operator int() const {return v_;}
75 /// copy_option - An "enum class" enumeration of copy semantics for copy
83 copy_option(_ v) : v_(v) {}
84 explicit copy_option(int v) : v_(_(v)) {}
85 operator int() const {return v_;}
91 /// space_info - Self explanatory.
104 owner_all = owner_read | owner_write | owner_exe,
108 group_all = group_read | group_write | group_exe,
112 others_all = others_read | others_write | others_exe,
113 all_all = owner_all | group_all | others_all,
114 set_uid_on_exe = 04000,
115 set_gid_on_exe = 02000,
117 perms_mask = all_all | set_uid_on_exe | set_gid_on_exe | sticky_bit,
118 perms_not_known = 0xFFFF,
120 remove_perms = 0x2000,
121 symlink_perms = 0x4000
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)
154 #elif defined (LLVM_ON_WIN32)
155 uint32_t LastWriteTimeHigh;
156 uint32_t LastWriteTimeLow;
157 uint32_t VolumeSerialNumber;
158 uint32_t FileSizeHigh;
159 uint32_t FileSizeLow;
160 uint32_t FileIndexHigh;
161 uint32_t FileIndexLow;
163 friend bool equivalent(file_status A, file_status B);
164 friend error_code status(const Twine &path, file_status &result);
168 explicit file_status(file_type v=file_type::status_error,
169 perms prms=perms_not_known)
170 : Type(v), Perms(prms) {}
173 file_type type() const { return Type; }
174 perms permissions() const { return Perms; }
177 void type(file_type v) { Type = v; }
178 void permissions(perms p) { Perms = p; }
181 /// file_magic - An "enum class" enumeration of file types based on magic (the first
182 /// N bytes of the file).
185 unknown = 0, ///< Unrecognized file
186 bitcode, ///< Bitcode file
187 archive, ///< ar style archive file
188 elf_relocatable, ///< ELF Relocatable object file
189 elf_executable, ///< ELF Executable image
190 elf_shared_object, ///< ELF dynamically linked shared lib
191 elf_core, ///< ELF core image
192 macho_object, ///< Mach-O Object file
193 macho_executable, ///< Mach-O Executable
194 macho_fixed_virtual_memory_shared_lib, ///< Mach-O Shared Lib, FVM
195 macho_core, ///< Mach-O Core File
196 macho_preload_executable, ///< Mach-O Preloaded Executable
197 macho_dynamically_linked_shared_lib, ///< Mach-O dynlinked shared lib
198 macho_dynamic_linker, ///< The Mach-O dynamic linker
199 macho_bundle, ///< Mach-O Bundle file
200 macho_dynamically_linked_shared_lib_stub, ///< Mach-O Shared lib stub
201 macho_dsym_companion, ///< Mach-O dSYM companion file
202 coff_object, ///< COFF object file
203 pecoff_executable ///< PECOFF executable file
206 bool is_object() const {
207 return V == unknown ? false : true;
210 file_magic() : V(unknown) {}
211 file_magic(Impl V) : V(V) {}
212 operator Impl() const { return V; }
219 /// @name Physical Operators
222 /// @brief Make \a path an absolute path.
224 /// Makes \a path absolute using the current directory if it is not already. An
225 /// empty \a path will result in the current directory.
227 /// /absolute/path => /absolute/path
228 /// relative/../path => <current-directory>/relative/../path
230 /// @param path A path that is modified to be an absolute path.
231 /// @returns errc::success if \a path has been made absolute, otherwise a
232 /// platform specific error_code.
233 error_code make_absolute(SmallVectorImpl<char> &path);
235 /// @brief Copy the file at \a from to the path \a to.
237 /// @param from The path to copy the file from.
238 /// @param to The path to copy the file to.
239 /// @param copt Behavior if \a to already exists.
240 /// @returns errc::success if the file has been successfully copied.
241 /// errc::file_exists if \a to already exists and \a copt ==
242 /// copy_option::fail_if_exists. Otherwise a platform specific
244 error_code copy_file(const Twine &from, const Twine &to,
245 copy_option copt = copy_option::fail_if_exists);
247 /// @brief Create all the non-existent directories in path.
249 /// @param path Directories to create.
250 /// @param existed Set to true if \a path already existed, false otherwise.
251 /// @returns errc::success if is_directory(path) and existed have been set,
252 /// otherwise a platform specific error_code.
253 error_code create_directories(const Twine &path, bool &existed);
255 /// @brief Create the directory in path.
257 /// @param path Directory to create.
258 /// @param existed Set to true if \a path already existed, false otherwise.
259 /// @returns errc::success if is_directory(path) and existed have been set,
260 /// otherwise a platform specific error_code.
261 error_code create_directory(const Twine &path, bool &existed);
263 /// @brief Create a hard link from \a from to \a to.
265 /// @param to The path to hard link to.
266 /// @param from The path to hard link from. This is created.
267 /// @returns errc::success if exists(to) && exists(from) && equivalent(to, from)
268 /// , otherwise a platform specific error_code.
269 error_code create_hard_link(const Twine &to, const Twine &from);
271 /// @brief Create a symbolic link from \a from to \a to.
273 /// @param to The path to symbolically link to.
274 /// @param from The path to symbolically link from. This is created.
275 /// @returns errc::success if exists(to) && exists(from) && is_symlink(from),
276 /// otherwise a platform specific error_code.
277 error_code create_symlink(const Twine &to, const Twine &from);
279 /// @brief Get the current path.
281 /// @param result Holds the current path on return.
282 /// @returns errc::success if the current path has been stored in result,
283 /// otherwise a platform specific error_code.
284 error_code current_path(SmallVectorImpl<char> &result);
286 /// @brief Remove path. Equivalent to POSIX remove().
288 /// @param path Input path.
289 /// @param existed Set to true if \a path existed, false if it did not.
290 /// undefined otherwise.
291 /// @returns errc::success if path has been removed and existed has been
292 /// successfully set, otherwise a platform specific error_code.
293 error_code remove(const Twine &path, bool &existed);
295 /// @brief Recursively remove all files below \a path, then \a path. Files are
296 /// removed as if by POSIX remove().
298 /// @param path Input path.
299 /// @param num_removed Number of files removed.
300 /// @returns errc::success if path has been removed and num_removed has been
301 /// successfully set, otherwise a platform specific error_code.
302 error_code remove_all(const Twine &path, uint32_t &num_removed);
304 /// @brief Rename \a from to \a to. Files are renamed as if by POSIX rename().
306 /// @param from The path to rename from.
307 /// @param to The path to rename to. This is created.
308 error_code rename(const Twine &from, const Twine &to);
310 /// @brief Resize path to size. File is resized as if by POSIX truncate().
312 /// @param path Input path.
313 /// @param size Size to resize to.
314 /// @returns errc::success if \a path has been resized to \a size, otherwise a
315 /// platform specific error_code.
316 error_code resize_file(const Twine &path, uint64_t size);
319 /// @name Physical Observers
322 /// @brief Does file exist?
324 /// @param status A file_status previously returned from stat.
325 /// @returns True if the file represented by status exists, false if it does
327 bool exists(file_status status);
329 /// @brief Does file exist?
331 /// @param path Input path.
332 /// @param result Set to true if the file represented by status exists, false if
333 /// it does not. Undefined otherwise.
334 /// @returns errc::success if result has been successfully set, otherwise a
335 /// platform specific error_code.
336 error_code exists(const Twine &path, bool &result);
338 /// @brief Simpler version of exists for clients that don't need to
339 /// differentiate between an error and false.
340 inline bool exists(const Twine &path) {
342 return !exists(path, result) && result;
345 /// @brief Can we execute this file?
347 /// @param Path Input path.
348 /// @returns True if we can execute it, false otherwise.
349 bool can_execute(const Twine &Path);
351 /// @brief Do file_status's represent the same thing?
353 /// @param A Input file_status.
354 /// @param B Input file_status.
356 /// assert(status_known(A) || status_known(B));
358 /// @returns True if A and B both represent the same file system entity, false
360 bool equivalent(file_status A, file_status B);
362 /// @brief Do paths represent the same thing?
364 /// assert(status_known(A) || status_known(B));
366 /// @param A Input path A.
367 /// @param B Input path B.
368 /// @param result Set to true if stat(A) and stat(B) have the same device and
369 /// inode (or equivalent).
370 /// @returns errc::success if result has been successfully set, otherwise a
371 /// platform specific error_code.
372 error_code equivalent(const Twine &A, const Twine &B, bool &result);
374 /// @brief Simpler version of equivalent for clients that don't need to
375 /// differentiate between an error and false.
376 inline bool equivalent(const Twine &A, const Twine &B) {
378 return !equivalent(A, B, result) && result;
381 /// @brief Get file size.
383 /// @param path Input path.
384 /// @param result Set to the size of the file in \a path.
385 /// @returns errc::success if result has been successfully set, otherwise a
386 /// platform specific error_code.
387 error_code file_size(const Twine &path, uint64_t &result);
389 /// @brief Does status represent a directory?
391 /// @param status A file_status previously returned from status.
392 /// @returns status.type() == file_type::directory_file.
393 bool is_directory(file_status status);
395 /// @brief Is path a directory?
397 /// @param path Input path.
398 /// @param result Set to true if \a path is a directory, false if it is not.
399 /// Undefined otherwise.
400 /// @returns errc::success if result has been successfully set, otherwise a
401 /// platform specific error_code.
402 error_code is_directory(const Twine &path, bool &result);
404 /// @brief Does status represent a regular file?
406 /// @param status A file_status previously returned from status.
407 /// @returns status_known(status) && status.type() == file_type::regular_file.
408 bool is_regular_file(file_status status);
410 /// @brief Is path a regular file?
412 /// @param path Input path.
413 /// @param result Set to true if \a path is a regular file, false if it is not.
414 /// Undefined otherwise.
415 /// @returns errc::success if result has been successfully set, otherwise a
416 /// platform specific error_code.
417 error_code is_regular_file(const Twine &path, bool &result);
419 /// @brief Does this status represent something that exists but is not a
420 /// directory, regular file, or symlink?
422 /// @param status A file_status previously returned from status.
423 /// @returns exists(s) && !is_regular_file(s) && !is_directory(s) &&
425 bool is_other(file_status status);
427 /// @brief Is path something that exists but is not a directory,
428 /// regular file, or symlink?
430 /// @param path Input path.
431 /// @param result Set to true if \a path exists, but is not a directory, regular
432 /// file, or a symlink, false if it does not. Undefined otherwise.
433 /// @returns errc::success if result has been successfully set, otherwise a
434 /// platform specific error_code.
435 error_code is_other(const Twine &path, bool &result);
437 /// @brief Does status represent a symlink?
439 /// @param status A file_status previously returned from stat.
440 /// @returns status.type() == symlink_file.
441 bool is_symlink(file_status status);
443 /// @brief Is path a symlink?
445 /// @param path Input path.
446 /// @param result Set to true if \a path is a symlink, false if it is not.
447 /// Undefined otherwise.
448 /// @returns errc::success if result has been successfully set, otherwise a
449 /// platform specific error_code.
450 error_code is_symlink(const Twine &path, bool &result);
452 /// @brief Get file status as if by POSIX stat().
454 /// @param path Input path.
455 /// @param result Set to the file status.
456 /// @returns errc::success if result has been successfully set, otherwise a
457 /// platform specific error_code.
458 error_code status(const Twine &path, file_status &result);
460 /// @brief Modifies permission bits on a file
462 /// @param path Input path.
463 /// @returns errc::success if permissions have been changed, otherwise a
464 /// platform specific error_code.
465 error_code permissions(const Twine &path, perms prms);
467 /// @brief Is status available?
469 /// @param s Input file status.
470 /// @returns True if status() != status_error.
471 bool status_known(file_status s);
473 /// @brief Is status available?
475 /// @param path Input path.
476 /// @param result Set to true if status() != status_error.
477 /// @returns errc::success if result has been successfully set, otherwise a
478 /// platform specific error_code.
479 error_code status_known(const Twine &path, bool &result);
481 /// @brief Generate a unique path and open it as a file.
483 /// Generates a unique path suitable for a temporary file and then opens it as a
484 /// file. The name is based on \a model with '%' replaced by a random char in
485 /// [0-9a-f]. If \a model is not an absolute path, a suitable temporary
486 /// directory will be prepended.
488 /// This is an atomic operation. Either the file is created and opened, or the
489 /// file system is left untouched.
491 /// clang-%%-%%-%%-%%-%%.s => /tmp/clang-a0-b1-c2-d3-e4.s
493 /// @param model Name to base unique path off of.
494 /// @param result_fd Set to the opened file's file descriptor.
495 /// @param result_path Set to the opened file's absolute path.
496 /// @param makeAbsolute If true and \a model is not an absolute path, a temp
497 /// directory will be prepended.
498 /// @returns errc::success if result_{fd,path} have been successfully set,
499 /// otherwise a platform specific error_code.
500 error_code unique_file(const Twine &model, int &result_fd,
501 SmallVectorImpl<char> &result_path,
502 bool makeAbsolute = true, unsigned mode = 0600);
504 /// @brief Canonicalize path.
506 /// Sets result to the file system's idea of what path is. The result is always
507 /// absolute and has the same capitalization as the file system.
509 /// @param path Input path.
510 /// @param result Set to the canonicalized version of \a path.
511 /// @returns errc::success if result has been successfully set, otherwise a
512 /// platform specific error_code.
513 error_code canonicalize(const Twine &path, SmallVectorImpl<char> &result);
515 /// @brief Are \a path's first bytes \a magic?
517 /// @param path Input path.
518 /// @param magic Byte sequence to compare \a path's first len(magic) bytes to.
519 /// @returns errc::success if result has been successfully set, otherwise a
520 /// platform specific error_code.
521 error_code has_magic(const Twine &path, const Twine &magic, bool &result);
523 /// @brief Get \a path's first \a len bytes.
525 /// @param path Input path.
526 /// @param len Number of magic bytes to get.
527 /// @param result Set to the first \a len bytes in the file pointed to by
528 /// \a path. Or the entire file if file_size(path) < len, in which
529 /// case result.size() returns the size of the file.
530 /// @returns errc::success if result has been successfully set,
531 /// errc::value_too_large if len is larger then the file pointed to by
532 /// \a path, otherwise a platform specific error_code.
533 error_code get_magic(const Twine &path, uint32_t len,
534 SmallVectorImpl<char> &result);
536 /// @brief Identify the type of a binary file based on how magical it is.
537 file_magic identify_magic(StringRef magic);
539 /// @brief Get and identify \a path's type based on its content.
541 /// @param path Input path.
542 /// @param result Set to the type of file, or file_magic::unknown.
543 /// @returns errc::success if result has been successfully set, otherwise a
544 /// platform specific error_code.
545 error_code identify_magic(const Twine &path, file_magic &result);
547 /// @brief Get library paths the system linker uses.
549 /// @param result Set to the list of system library paths.
550 /// @returns errc::success if result has been successfully set, otherwise a
551 /// platform specific error_code.
552 error_code GetSystemLibraryPaths(SmallVectorImpl<std::string> &result);
554 /// @brief Get bitcode library paths the system linker uses
555 /// + LLVM_LIB_SEARCH_PATH + LLVM_LIBDIR.
557 /// @param result Set to the list of bitcode library paths.
558 /// @returns errc::success if result has been successfully set, otherwise a
559 /// platform specific error_code.
560 error_code GetBitcodeLibraryPaths(SmallVectorImpl<std::string> &result);
562 /// @brief Find a library.
564 /// Find the path to a library using its short name. Use the system
565 /// dependent library paths to locate the library.
567 /// c => /usr/lib/libc.so
569 /// @param short_name Library name one would give to the system linker.
570 /// @param result Set to the absolute path \a short_name represents.
571 /// @returns errc::success if result has been successfully set, otherwise a
572 /// platform specific error_code.
573 error_code FindLibrary(const Twine &short_name, SmallVectorImpl<char> &result);
575 /// @brief Get absolute path of main executable.
577 /// @param argv0 The program name as it was spelled on the command line.
578 /// @param MainAddr Address of some symbol in the executable (not in a library).
579 /// @param result Set to the absolute path of the current executable.
580 /// @returns errc::success if result has been successfully set, otherwise a
581 /// platform specific error_code.
582 error_code GetMainExecutable(const char *argv0, void *MainAddr,
583 SmallVectorImpl<char> &result);
585 /// This class represents a memory mapped file. It is based on
586 /// boost::iostreams::mapped_file.
587 class mapped_file_region {
588 mapped_file_region() LLVM_DELETED_FUNCTION;
589 mapped_file_region(mapped_file_region&) LLVM_DELETED_FUNCTION;
590 mapped_file_region &operator =(mapped_file_region&) LLVM_DELETED_FUNCTION;
594 readonly, ///< May only access map via const_data as read only.
595 readwrite, ///< May access map via data and modify it. Written to path.
596 priv ///< May modify via data, but changes are lost on destruction.
600 /// Platform specific mapping state.
607 void *FileMappingHandle;
610 error_code init(int FD, bool CloseFD, uint64_t Offset);
613 typedef char char_type;
615 #if LLVM_HAS_RVALUE_REFERENCES
616 mapped_file_region(mapped_file_region&&);
617 mapped_file_region &operator =(mapped_file_region&&);
620 /// Construct a mapped_file_region at \a path starting at \a offset of length
621 /// \a length and with access \a mode.
623 /// \param path Path to the file to map. If it does not exist it will be
625 /// \param mode How to map the memory.
626 /// \param length Number of bytes to map in starting at \a offset. If the file
627 /// is shorter than this, it will be extended. If \a length is
628 /// 0, the entire file will be mapped.
629 /// \param offset Byte offset from the beginning of the file where the map
630 /// should begin. Must be a multiple of
631 /// mapped_file_region::alignment().
632 /// \param ec This is set to errc::success if the map was constructed
633 /// sucessfully. Otherwise it is set to a platform dependent error.
634 mapped_file_region(const Twine &path,
640 /// \param fd An open file descriptor to map. mapped_file_region takes
641 /// ownership if closefd is true. It must have been opended in the correct
643 mapped_file_region(int fd,
650 ~mapped_file_region();
652 mapmode flags() const;
653 uint64_t size() const;
656 /// Get a const view of the data. Modifying this memory has undefined
658 const char *const_data() const;
660 /// \returns The minimum alignment offset must be.
661 static int alignment();
664 /// @brief Memory maps the contents of a file
666 /// @param path Path to file to map.
667 /// @param file_offset Byte offset in file where mapping should begin.
668 /// @param size Byte length of range of the file to map.
669 /// @param map_writable If true, the file will be mapped in r/w such
670 /// that changes to the mapped buffer will be flushed back
671 /// to the file. If false, the file will be mapped read-only
672 /// and the buffer will be read-only.
673 /// @param result Set to the start address of the mapped buffer.
674 /// @returns errc::success if result has been successfully set, otherwise a
675 /// platform specific error_code.
676 error_code map_file_pages(const Twine &path, off_t file_offset, size_t size,
677 bool map_writable, void *&result);
680 /// @brief Memory unmaps the contents of a file
682 /// @param base Pointer to the start of the buffer.
683 /// @param size Byte length of the range to unmmap.
684 /// @returns errc::success if result has been successfully set, otherwise a
685 /// platform specific error_code.
686 error_code unmap_file_pages(void *base, size_t size);
694 /// directory_entry - A single entry in a directory. Caches the status either
695 /// from the result of the iteration syscall, or the first time status is
697 class directory_entry {
699 mutable file_status Status;
702 explicit directory_entry(const Twine &path, file_status st = file_status())
708 void assign(const Twine &path, file_status st = file_status()) {
713 void replace_filename(const Twine &filename, file_status st = file_status());
715 const std::string &path() const { return Path; }
716 error_code status(file_status &result) const;
718 bool operator==(const directory_entry& rhs) const { return Path == rhs.Path; }
719 bool operator!=(const directory_entry& rhs) const { return !(*this == rhs); }
720 bool operator< (const directory_entry& rhs) const;
721 bool operator<=(const directory_entry& rhs) const;
722 bool operator> (const directory_entry& rhs) const;
723 bool operator>=(const directory_entry& rhs) const;
729 error_code directory_iterator_construct(DirIterState&, StringRef);
730 error_code directory_iterator_increment(DirIterState&);
731 error_code directory_iterator_destruct(DirIterState&);
733 /// DirIterState - Keeps state for the directory_iterator. It is reference
734 /// counted in order to preserve InputIterator semantics on copy.
735 struct DirIterState : public RefCountedBase<DirIterState> {
737 : IterationHandle(0) {}
740 directory_iterator_destruct(*this);
743 intptr_t IterationHandle;
744 directory_entry CurrentEntry;
748 /// directory_iterator - Iterates through the entries in path. There is no
749 /// operator++ because we need an error_code. If it's really needed we can make
750 /// it call report_fatal_error on error.
751 class directory_iterator {
752 IntrusiveRefCntPtr<detail::DirIterState> State;
755 explicit directory_iterator(const Twine &path, error_code &ec) {
756 State = new detail::DirIterState;
757 SmallString<128> path_storage;
758 ec = detail::directory_iterator_construct(*State,
759 path.toStringRef(path_storage));
762 explicit directory_iterator(const directory_entry &de, error_code &ec) {
763 State = new detail::DirIterState;
764 ec = detail::directory_iterator_construct(*State, de.path());
767 /// Construct end iterator.
768 directory_iterator() : State(new detail::DirIterState) {}
770 // No operator++ because we need error_code.
771 directory_iterator &increment(error_code &ec) {
772 ec = directory_iterator_increment(*State);
776 const directory_entry &operator*() const { return State->CurrentEntry; }
777 const directory_entry *operator->() const { return &State->CurrentEntry; }
779 bool operator==(const directory_iterator &RHS) const {
780 return State->CurrentEntry == RHS.State->CurrentEntry;
783 bool operator!=(const directory_iterator &RHS) const {
784 return !(*this == RHS);
786 // Other members as required by
787 // C++ Std, 24.1.1 Input iterators [input.iterators]
791 /// RecDirIterState - Keeps state for the recursive_directory_iterator. It is
792 /// reference counted in order to preserve InputIterator semantics on copy.
793 struct RecDirIterState : public RefCountedBase<RecDirIterState> {
796 , HasNoPushRequest(false) {}
798 std::stack<directory_iterator, std::vector<directory_iterator> > Stack;
800 bool HasNoPushRequest;
804 /// recursive_directory_iterator - Same as directory_iterator except for it
805 /// recurses down into child directories.
806 class recursive_directory_iterator {
807 IntrusiveRefCntPtr<detail::RecDirIterState> State;
810 recursive_directory_iterator() {}
811 explicit recursive_directory_iterator(const Twine &path, error_code &ec)
812 : State(new detail::RecDirIterState) {
813 State->Stack.push(directory_iterator(path, ec));
814 if (State->Stack.top() == directory_iterator())
817 // No operator++ because we need error_code.
818 recursive_directory_iterator &increment(error_code &ec) {
819 static const directory_iterator end_itr;
821 if (State->HasNoPushRequest)
822 State->HasNoPushRequest = false;
825 if ((ec = State->Stack.top()->status(st))) return *this;
826 if (is_directory(st)) {
827 State->Stack.push(directory_iterator(*State->Stack.top(), ec));
828 if (ec) return *this;
829 if (State->Stack.top() != end_itr) {
837 while (!State->Stack.empty()
838 && State->Stack.top().increment(ec) == end_itr) {
843 // Check if we are done. If so, create an end iterator.
844 if (State->Stack.empty())
850 const directory_entry &operator*() const { return *State->Stack.top(); }
851 const directory_entry *operator->() const { return &*State->Stack.top(); }
854 /// Gets the current level. Starting path is at level 0.
855 int level() const { return State->Level; }
857 /// Returns true if no_push has been called for this directory_entry.
858 bool no_push_request() const { return State->HasNoPushRequest; }
861 /// Goes up one level if Level > 0.
863 assert(State && "Cannot pop and end itertor!");
864 assert(State->Level > 0 && "Cannot pop an iterator with level < 1");
866 static const directory_iterator end_itr;
870 report_fatal_error("Error incrementing directory iterator.");
873 } while (!State->Stack.empty()
874 && State->Stack.top().increment(ec) == end_itr);
876 // Check if we are done. If so, create an end iterator.
877 if (State->Stack.empty())
881 /// Does not go down into the current directory_entry.
882 void no_push() { State->HasNoPushRequest = true; }
884 bool operator==(const recursive_directory_iterator &RHS) const {
885 return State == RHS.State;
888 bool operator!=(const recursive_directory_iterator &RHS) const {
889 return !(*this == RHS);
891 // Other members as required by
892 // C++ Std, 24.1.1 Input iterators [input.iterators]
897 } // end namespace fs
898 } // end namespace sys
899 } // end namespace llvm