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_FILE_SYSTEM_H
28 #define LLVM_SUPPORT_FILE_SYSTEM_H
30 #include "llvm/ADT/SmallString.h"
31 #include "llvm/ADT/Twine.h"
32 #include "llvm/Support/DataTypes.h"
33 #include "llvm/Support/system_error.h"
42 /// file_type - An "enum class" enumeration for the file system's view of the
58 file_type(_ v) : v_(v) {}
59 explicit file_type(int v) : v_(_(v)) {}
60 operator int() const {return v_;}
66 /// copy_option - An "enum class" enumeration of copy semantics for copy
74 copy_option(_ v) : v_(v) {}
75 explicit copy_option(int v) : v_(_(v)) {}
76 operator int() const {return v_;}
82 /// space_info - Self explanatory.
89 /// file_status - Represents the result of a call to stat and friends. It has
90 /// a platform specific member to store the result.
93 // implementation defined status field.
95 explicit file_status(file_type v=file_type::status_error);
97 file_type type() const;
98 void type(file_type v);
102 /// @name Physical Operators
105 /// @brief Copy the file at \a from to the path \a to.
107 /// @param from The path to copy the file from.
108 /// @param to The path to copy the file to.
109 /// @param copt Behavior if \a to already exists.
110 /// @returns errc::success if the file has been successfully copied.
111 /// errc::file_exists if \a to already exists and \a copt ==
112 /// copy_option::fail_if_exists. Otherwise a platform specific
114 error_code copy_file(const Twine &from, const Twine &to,
115 copy_option copt = copy_option::fail_if_exists);
117 /// @brief Create all the non-existent directories in path.
119 /// @param path Directories to create.
120 /// @param existed Set to true if \a path already existed, false otherwise.
121 /// @returns errc::success if is_directory(path) and existed have been set,
122 /// otherwise a platform specific error_code.
123 error_code create_directories(const Twine &path, bool &existed);
125 /// @brief Create the directory in path.
127 /// @param path Directory to create.
128 /// @param existed Set to true if \a path already existed, false otherwise.
129 /// @returns errc::success if is_directory(path) and existed have been set,
130 /// otherwise a platform specific error_code.
131 error_code create_directory(const Twine &path, bool &existed);
133 /// @brief Create a hard link from \a from to \a to.
135 /// @param to The path to hard link to.
136 /// @param from The path to hard link from. This is created.
137 /// @returns errc::success if exists(to) && exists(from) && equivalent(to, from)
138 /// , otherwise a platform specific error_code.
139 error_code create_hard_link(const Twine &to, const Twine &from);
141 /// @brief Create a symbolic link from \a from to \a to.
143 /// @param to The path to symbolically link to.
144 /// @param from The path to symbolically link from. This is created.
145 /// @returns errc::success if exists(to) && exists(from) && is_symlink(from),
146 /// otherwise a platform specific error_code.
147 error_code create_symlink(const Twine &to, const Twine &from);
149 /// @brief Remove path. Equivalent to POSIX remove().
151 /// @param path Input path.
152 /// @param existed Set to true if \a path existed, false if it did not.
153 /// undefined otherwise.
154 /// @results errc::success if path has been removed and existed has been
155 /// successfully set, otherwise a platform specific error_code.
156 error_code remove(const Twine &path, bool &existed);
158 /// @brief Recursively remove all files below \a path, then \a path. Files are
159 /// removed as if by POSIX remove().
161 /// @param path Input path.
162 /// @param num_removed Number of files removed.
163 /// @results errc::success if path has been removed and num_removed has been
164 /// successfully set, otherwise a platform specific error_code.
165 error_code remove_all(const Twine &path, uint32_t &num_removed);
167 /// @brief Rename \a from to \a to. Files are renamed as if by POSIX rename().
169 /// @param from The path to rename from.
170 /// @param to The path to rename to. This is created.
171 error_code rename(const Twine &from, const Twine &to);
173 /// @brief Resize path to size. File is resized as if by POSIX truncate().
175 /// @param path Input path.
176 /// @param size Size to resize to.
177 /// @returns errc::success if \a path has been resized to \a size, otherwise a
178 /// platform specific error_code.
179 error_code resize_file(const Twine &path, uint64_t size);
181 /// @brief Make file readable.
183 /// @param path Input path.
184 /// @param value If true, make readable, else, make unreadable.
185 /// @results errc::success if readability has been successfully set, otherwise a
186 /// platform specific error_code.
187 error_code set_read(const Twine &path, bool value);
189 /// @brief Make file writeable.
191 /// @param path Input path.
192 /// @param value If true, make writeable, else, make unwriteable.
193 /// @results errc::success if writeability has been successfully set, otherwise
194 /// a platform specific error_code.
195 error_code set_write(const Twine &path, bool value);
197 /// @brief Make file executable.
199 /// @param path Input path.
200 /// @param value If true, make executable, else, make unexecutable.
201 /// @results errc::success if executability has been successfully set, otherwise
202 /// a platform specific error_code.
203 error_code set_execute(const Twine &path, bool value);
206 /// @name Physical Observers
209 /// @brief Does file exist?
211 /// @param status A file_status previously returned from stat.
212 /// @param result Set to true if the file represented by status exists, false if
213 /// it does not. Undefined otherwise.
214 /// @results errc::success if result has been successfully set, otherwise a
215 /// platform specific error_code.
216 error_code exists(file_status status, bool &result);
218 /// @brief Does file exist?
220 /// @param path Input path.
221 /// @param result Set to true if the file represented by status exists, false if
222 /// it does not. Undefined otherwise.
223 /// @results errc::success if result has been successfully set, otherwise a
224 /// platform specific error_code.
225 error_code exists(const Twine &path, bool &result);
227 /// @brief Do paths represent the same thing?
229 /// @param A Input path A.
230 /// @param B Input path B.
231 /// @param result Set to true if stat(A) and stat(B) have the same device and
232 /// inode (or equivalent).
233 /// @results errc::success if result has been successfully set, otherwise a
234 /// platform specific error_code.
235 error_code equivalent(const Twine &A, const Twine &B, bool &result);
237 /// @brief Get file size.
239 /// @param path Input path.
240 /// @param result Set to the size of the file in \a path.
241 /// @returns errc::success if result has been successfully set, otherwise a
242 /// platform specific error_code.
243 error_code file_size(const Twine &path, uint64_t &result);
245 /// @brief Does status represent a directory?
247 /// @param status A file_status previously returned from stat.
248 /// @param result Set to true if the file represented by status is a directory,
249 /// false if it is not. Undefined otherwise.
250 /// @results errc::success if result has been successfully set, otherwise a
251 /// platform specific error_code.
252 error_code is_directory(file_status status, bool &result);
254 /// @brief Is path a directory?
256 /// @param path Input path.
257 /// @param result Set to true if \a path is a directory, false if it is not.
258 /// Undefined otherwise.
259 /// @results errc::success if result has been successfully set, otherwise a
260 /// platform specific error_code.
261 error_code is_directory(const Twine &path, bool &result);
263 /// @brief Is path an empty file?
265 /// @param path Input path.
266 /// @param result Set to true if \a path is a an empty file, false if it is not.
267 /// Undefined otherwise.
268 /// @results errc::success if result has been successfully set, otherwise a
269 /// platform specific error_code.
270 error_code is_empty(const Twine &path, bool &result);
272 /// @brief Does status represent a regular file?
274 /// @param status A file_status previously returned from stat.
275 /// @param result Set to true if the file represented by status is a regular
276 /// file, false if it is not. Undefined otherwise.
277 /// @results errc::success if result has been successfully set, otherwise a
278 /// platform specific error_code.
279 error_code is_regular_file(file_status status, bool &result);
281 /// @brief Is path a regular file?
283 /// @param path Input path.
284 /// @param result Set to true if \a path is a regular file, false if it is not.
285 /// Undefined otherwise.
286 /// @results errc::success if result has been successfully set, otherwise a
287 /// platform specific error_code.
288 error_code is_regular_file(const Twine &path, bool &result);
290 /// @brief Does status represent something that exists but is not a directory,
291 /// regular file, or symlink?
293 /// @param status A file_status previously returned from stat.
294 /// @param result Set to true if the file represented by status exists, but is
295 /// not a directory, regular file, or a symlink, false if it does
296 /// not. Undefined otherwise.
297 /// @results errc::success if result has been successfully set, otherwise a
298 /// platform specific error_code.
299 error_code is_other(file_status status, bool &result);
301 /// @brief Is path something that exists but is not a directory,
302 /// regular file, or symlink?
304 /// @param path Input path.
305 /// @param result Set to true if \a path exists, but is not a directory, regular
306 /// file, or a symlink, false if it does not. Undefined otherwise.
307 /// @results errc::success if result has been successfully set, otherwise a
308 /// platform specific error_code.
309 error_code is_other(const Twine &path, bool &result);
311 /// @brief Does status represent a symlink?
313 /// @param status A file_status previously returned from stat.
314 /// @param result Set to true if the file represented by status is a symlink,
315 /// false if it is not. Undefined otherwise.
316 /// @results errc::success if result has been successfully set, otherwise a
317 /// platform specific error_code.
318 error_code is_symlink(file_status status, bool &result);
320 /// @brief Is path a symlink?
322 /// @param path Input path.
323 /// @param result Set to true if \a path is a symlink, false if it is not.
324 /// Undefined otherwise.
325 /// @results errc::success if result has been successfully set, otherwise a
326 /// platform specific error_code.
327 error_code is_symlink(const Twine &path, bool &result);
329 /// @brief Get last write time without changing it.
331 /// @param path Input path.
332 /// @param result Set to the last write time (UNIX time) of \a path if it
334 /// @results errc::success if result has been successfully set, otherwise a
335 /// platform specific error_code.
336 error_code last_write_time(const Twine &path, std::time_t &result);
338 /// @brief Set last write time.
340 /// @param path Input path.
341 /// @param value Time to set (UNIX time) \a path's last write time to.
342 /// @results errc::success if result has been successfully set, otherwise a
343 /// platform specific error_code.
344 error_code set_last_write_time(const Twine &path, std::time_t value);
346 /// @brief Read a symlink's value.
348 /// @param path Input path.
349 /// @param result Set to the value of the symbolic link \a path.
350 /// @results errc::success if result has been successfully set, otherwise a
351 /// platform specific error_code.
352 error_code read_symlink(const Twine &path, SmallVectorImpl<char> &result);
354 /// @brief Get disk space usage information.
356 /// @param path Input path.
357 /// @param result Set to the capacity, free, and available space on the device
359 /// @results errc::success if result has been successfully set, otherwise a
360 /// platform specific error_code.
361 error_code disk_space(const Twine &path, space_info &result);
363 /// @brief Get file status as if by POSIX stat().
365 /// @param path Input path.
366 /// @param result Set to the file status.
367 /// @results errc::success if result has been successfully set, otherwise a
368 /// platform specific error_code.
369 error_code status(const Twine &path, file_status &result);
371 /// @brief Is status available?
373 /// @param path Input path.
374 /// @param result Set to true if status() != status_error.
375 /// @results errc::success if result has been successfully set, otherwise a
376 /// platform specific error_code.
377 error_code status_known(const Twine &path, bool &result);
379 /// @brief Get file status as if by POSIX lstat().
381 /// Does not resolve symlinks.
383 /// @param path Input path.
384 /// @param result Set to the file status.
385 /// @results errc::success if result has been successfully set, otherwise a
386 /// platform specific error_code.
387 error_code symlink_status(const Twine &path, file_status &result);
389 /// @brief Generate a unique path and open it as a file.
391 /// Generates a unique path suitable for a temporary file and then opens it as a
392 /// file. The name is based on \a model with '%' replaced by a random char in
393 /// [0-9a-f]. If \a model is not an absolute path, a suitable temporary
394 /// directory will be prepended.
396 /// This is an atomic operation. Either the file is created and opened, or the
397 /// file system is left untouched.
399 /// clang-%%-%%-%%-%%-%%.s => /tmp/clang-a0-b1-c2-d3-e4.s
401 /// @param model Name to base unique path off of.
402 /// @param result_fs Set to the opened file's file descriptor.
403 /// @param result_path Set to the opened file's absolute path.
404 /// @results errc::success if result_{fd,path} have been successfully set,
405 /// otherwise a platform specific error_code.
406 error_code unique_file(const Twine &model, int &result_fd,
407 SmallVectorImpl<char> &result_path);
409 /// @brief Canonicalize path.
411 /// Sets result to the file system's idea of what path is. The result is always
412 /// absolute and has the same capitalization as the file system.
414 /// @param path Input path.
415 /// @param result Set to the canonicalized version of \a path.
416 /// @results errc::success if result has been successfully set, otherwise a
417 /// platform specific error_code.
418 error_code canonicalize(const Twine &path, SmallVectorImpl<char> &result);
420 /// @brief Are \a path's first bytes \a magic?
422 /// @param path Input path.
423 /// @param magic Byte sequence to compare \a path's first len(magic) bytes to.
424 /// @results errc::success if result has been successfully set, otherwise a
425 /// platform specific error_code.
426 error_code has_magic(const Twine &path, const Twine &magic);
428 /// @brief Get \a path's first \a len bytes.
430 /// @param path Input path.
431 /// @param len Number of magic bytes to get.
432 /// @param result Set to the first \a len bytes in the file pointed to by
434 /// @results errc::success if result has been successfully set, otherwise a
435 /// platform specific error_code.
436 error_code get_magic(const Twine &path, uint32_t len,
437 SmallVectorImpl<char> &result);
439 /// @brief Is file bitcode?
441 /// @param path Input path.
442 /// @param result Set to true if \a path is a bitcode file, false if it is not,
443 /// undefined otherwise.
444 /// @results errc::success if result has been successfully set, otherwise a
445 /// platform specific error_code.
446 error_code is_bitcode(const Twine &path, bool &result);
448 /// @brief Is file a dynamic library?
450 /// @param path Input path.
451 /// @param result Set to true if \a path is a dynamic library, false if it is
452 /// not, undefined otherwise.
453 /// @results errc::success if result has been successfully set, otherwise a
454 /// platform specific error_code.
455 error_code is_dynamic_library(const Twine &path, bool &result);
457 /// @brief Is an object file?
459 /// @param path Input path.
460 /// @param result Set to true if \a path is an object file, false if it is not,
461 /// undefined otherwise.
462 /// @results errc::success if result has been successfully set, otherwise a
463 /// platform specific error_code.
464 error_code is_object_file(const Twine &path, bool &result);
466 /// @brief Can file be read?
468 /// @param path Input path.
469 /// @param result Set to true if \a path is readable, false it it is not,
470 /// undefined otherwise.
471 /// @results errc::success if result has been successfully set, otherwise a
472 /// platform specific error_code.
473 error_code can_read(const Twine &path, bool &result);
475 /// @brief Can file be written?
477 /// @param path Input path.
478 /// @param result Set to true if \a path is writeable, false it it is not,
479 /// undefined otherwise.
480 /// @results errc::success if result has been successfully set, otherwise a
481 /// platform specific error_code.
482 error_code can_write(const Twine &path, bool &result);
484 /// @brief Can file be executed?
486 /// @param path Input path.
487 /// @param result Set to true if \a path is executable, false it it is not,
488 /// undefined otherwise.
489 /// @results errc::success if result has been successfully set, otherwise a
490 /// platform specific error_code.
491 error_code can_execute(const Twine &path, bool &result);
493 /// @brief Get library paths the system linker uses.
495 /// @param result Set to the list of system library paths.
496 /// @results errc::success if result has been successfully set, otherwise a
497 /// platform specific error_code.
498 error_code GetSystemLibraryPaths(SmallVectorImpl<std::string> &result);
500 /// @brief Get bitcode library paths the system linker uses
501 /// + LLVM_LIB_SEARCH_PATH + LLVM_LIBDIR.
503 /// @param result Set to the list of bitcode library paths.
504 /// @results errc::success if result has been successfully set, otherwise a
505 /// platform specific error_code.
506 error_code GetBitcodeLibraryPaths(SmallVectorImpl<std::string> &result);
508 /// @brief Find a library.
510 /// Find the path to a library using its short name. Use the system
511 /// dependent library paths to locate the library.
513 /// c => /usr/lib/libc.so
515 /// @param short_name Library name one would give to the system linker.
516 /// @param result Set to the absolute path \a short_name represents.
517 /// @results errc::success if result has been successfully set, otherwise a
518 /// platform specific error_code.
519 error_code FindLibrary(const Twine &short_name, SmallVectorImpl<char> &result);
521 /// @brief Get absolute path of main executable.
523 /// @param argv0 The program name as it was spelled on the command line.
524 /// @param MainAddr Address of some symbol in the executable (not in a library).
525 /// @param result Set to the absolute path of the current executable.
526 /// @results errc::success if result has been successfully set, otherwise a
527 /// platform specific error_code.
528 error_code GetMainExecutable(const char *argv0, void *MainAddr,
529 SmallVectorImpl<char> &result);
535 /// directory_entry - A single entry in a directory. Caches the status either
536 /// from the result of the iteration syscall, or the first time status or
537 /// symlink_status is called.
538 class directory_entry {
540 mutable file_status Status;
541 mutable file_status SymlinkStatus;
544 explicit directory_entry(const Twine &path, file_status st = file_status(),
545 file_status symlink_st = file_status());
547 void assign(const Twine &path, file_status st = file_status(),
548 file_status symlink_st = file_status());
549 void replace_filename(const Twine &filename, file_status st = file_status(),
550 file_status symlink_st = file_status());
552 const SmallVectorImpl<char> &path() const;
553 error_code status(file_status &result) const;
554 error_code symlink_status(file_status &result) const;
556 bool operator==(const directory_entry& rhs) const;
557 bool operator!=(const directory_entry& rhs) const;
558 bool operator< (const directory_entry& rhs) const;
559 bool operator<=(const directory_entry& rhs) const;
560 bool operator> (const directory_entry& rhs) const;
561 bool operator>=(const directory_entry& rhs) const;
564 /// directory_iterator - Iterates through the entries in path. There is no
565 /// operator++ because we need an error_code. If it's really needed we can make
566 /// it call report_fatal_error on error.
567 class directory_iterator {
568 // implementation directory iterator status
571 explicit directory_iterator(const Twine &path, error_code &ec);
572 // No operator++ because we need error_code.
573 directory_iterator &increment(error_code &ec);
575 const directory_entry &operator*() const;
576 const directory_entry *operator->() const;
578 // Other members as required by
579 // C++ Std, 24.1.1 Input iterators [input.iterators]
582 /// recursive_directory_iterator - Same as directory_iterator except for it
583 /// recurses down into child directories.
584 class recursive_directory_iterator {
586 bool HasNoPushRequest;
587 // implementation directory iterator status
590 explicit recursive_directory_iterator(const Twine &path, error_code &ec);
591 // No operator++ because we need error_code.
592 directory_iterator &increment(error_code &ec);
594 const directory_entry &operator*() const;
595 const directory_entry *operator->() const;
598 /// Gets the current level. path is at level 0.
600 /// Returns true if no_push has been called for this directory_entry.
601 bool no_push_request() const;
604 /// Goes up one level if Level > 0.
606 /// Does not go down into the current directory_entry.
609 // Other members as required by
610 // C++ Std, 24.1.1 Input iterators [input.iterators]
615 } // end namespace fs
616 } // end namespace sys
617 } // end namespace llvm