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/IntrusiveRefCntPtr.h"
31 #include "llvm/ADT/SmallString.h"
32 #include "llvm/ADT/Twine.h"
33 #include "llvm/Support/DataTypes.h"
34 #include "llvm/Support/ErrorHandling.h"
35 #include "llvm/Support/PathV1.h"
36 #include "llvm/Support/system_error.h"
46 /// file_type - An "enum class" enumeration for the file system's view of the
62 file_type(_ v) : v_(v) {}
63 explicit file_type(int v) : v_(_(v)) {}
64 operator int() const {return v_;}
70 /// copy_option - An "enum class" enumeration of copy semantics for copy
78 copy_option(_ v) : v_(v) {}
79 explicit copy_option(int v) : v_(_(v)) {}
80 operator int() const {return v_;}
86 /// space_info - Self explanatory.
93 /// file_status - Represents the result of a call to stat and friends. It has
94 /// a platform specific member to store the result.
97 // implementation defined status field.
100 explicit file_status(file_type v=file_type::status_error)
103 file_type type() const { return Type; }
104 void type(file_type v) { Type = v; }
108 /// @name Physical Operators
111 /// @brief Make \a path an absolute path.
113 /// Makes \a path absolute using the current directory if it is not already. An
114 /// empty \a path will result in the current directory.
116 /// /absolute/path => /absolute/path
117 /// relative/../path => <current-directory>/relative/../path
119 /// @param path A path that is modified to be an absolute path.
120 /// @returns errc::success if \a path has been made absolute, otherwise a
121 /// platform specific error_code.
122 error_code make_absolute(SmallVectorImpl<char> &path);
124 /// @brief Copy the file at \a from to the path \a to.
126 /// @param from The path to copy the file from.
127 /// @param to The path to copy the file to.
128 /// @param copt Behavior if \a to already exists.
129 /// @returns errc::success if the file has been successfully copied.
130 /// errc::file_exists if \a to already exists and \a copt ==
131 /// copy_option::fail_if_exists. Otherwise a platform specific
133 error_code copy_file(const Twine &from, const Twine &to,
134 copy_option copt = copy_option::fail_if_exists);
136 /// @brief Create all the non-existent directories in path.
138 /// @param path Directories to create.
139 /// @param existed Set to true if \a path already existed, false otherwise.
140 /// @returns errc::success if is_directory(path) and existed have been set,
141 /// otherwise a platform specific error_code.
142 error_code create_directories(const Twine &path, bool &existed);
144 /// @brief Create the directory in path.
146 /// @param path Directory to create.
147 /// @param existed Set to true if \a path already existed, false otherwise.
148 /// @returns errc::success if is_directory(path) and existed have been set,
149 /// otherwise a platform specific error_code.
150 error_code create_directory(const Twine &path, bool &existed);
152 /// @brief Create a hard link from \a from to \a to.
154 /// @param to The path to hard link to.
155 /// @param from The path to hard link from. This is created.
156 /// @returns errc::success if exists(to) && exists(from) && equivalent(to, from)
157 /// , otherwise a platform specific error_code.
158 error_code create_hard_link(const Twine &to, const Twine &from);
160 /// @brief Create a symbolic link from \a from to \a to.
162 /// @param to The path to symbolically link to.
163 /// @param from The path to symbolically link from. This is created.
164 /// @returns errc::success if exists(to) && exists(from) && is_symlink(from),
165 /// otherwise a platform specific error_code.
166 error_code create_symlink(const Twine &to, const Twine &from);
168 /// @brief Get the current path.
170 /// @param result Holds the current path on return.
171 /// @results errc::success if the current path has been stored in result,
172 /// otherwise a platform specific error_code.
173 error_code current_path(SmallVectorImpl<char> &result);
175 /// @brief Remove path. Equivalent to POSIX remove().
177 /// @param path Input path.
178 /// @param existed Set to true if \a path existed, false if it did not.
179 /// undefined otherwise.
180 /// @results errc::success if path has been removed and existed has been
181 /// successfully set, otherwise a platform specific error_code.
182 error_code remove(const Twine &path, bool &existed);
184 /// @brief Recursively remove all files below \a path, then \a path. Files are
185 /// removed as if by POSIX remove().
187 /// @param path Input path.
188 /// @param num_removed Number of files removed.
189 /// @results errc::success if path has been removed and num_removed has been
190 /// successfully set, otherwise a platform specific error_code.
191 error_code remove_all(const Twine &path, uint32_t &num_removed);
193 /// @brief Rename \a from to \a to. Files are renamed as if by POSIX rename().
195 /// @param from The path to rename from.
196 /// @param to The path to rename to. This is created.
197 error_code rename(const Twine &from, const Twine &to);
199 /// @brief Resize path to size. File is resized as if by POSIX truncate().
201 /// @param path Input path.
202 /// @param size Size to resize to.
203 /// @returns errc::success if \a path has been resized to \a size, otherwise a
204 /// platform specific error_code.
205 error_code resize_file(const Twine &path, uint64_t size);
208 /// @name Physical Observers
211 /// @brief Does file exist?
213 /// @param status A file_status previously returned from stat.
214 /// @results True if the file represented by status exists, false if it does
216 bool exists(file_status status);
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 Simpler version of exists for clients that don't need to
228 /// differentiate between an error and false.
229 inline bool exists(const Twine &path) {
231 return !exists(path, result) && result;
234 /// @brief Do file_status's represent the same thing?
236 /// @param A Input file_status.
237 /// @param B Input file_status.
239 /// assert(status_known(A) || status_known(B));
241 /// @results True if A and B both represent the same file system entity, false
243 bool equivalent(file_status A, file_status B);
245 /// @brief Do paths represent the same thing?
247 /// @param A Input path A.
248 /// @param B Input path B.
249 /// @param result Set to true if stat(A) and stat(B) have the same device and
250 /// inode (or equivalent).
251 /// @results errc::success if result has been successfully set, otherwise a
252 /// platform specific error_code.
253 error_code equivalent(const Twine &A, const Twine &B, bool &result);
255 /// @brief Get file size.
257 /// @param path Input path.
258 /// @param result Set to the size of the file in \a path.
259 /// @returns errc::success if result has been successfully set, otherwise a
260 /// platform specific error_code.
261 error_code file_size(const Twine &path, uint64_t &result);
263 /// @brief Does status represent a directory?
265 /// @param status A file_status previously returned from status.
266 /// @results status.type() == file_type::directory_file.
267 bool is_directory(file_status status);
269 /// @brief Is path a directory?
271 /// @param path Input path.
272 /// @param result Set to true if \a path is a directory, false if it is not.
273 /// Undefined otherwise.
274 /// @results errc::success if result has been successfully set, otherwise a
275 /// platform specific error_code.
276 error_code is_directory(const Twine &path, bool &result);
278 /// @brief Does status represent a regular file?
280 /// @param status A file_status previously returned from status.
281 /// @results status_known(status) && status.type() == file_type::regular_file.
282 bool is_regular_file(file_status status);
284 /// @brief Is path a regular file?
286 /// @param path Input path.
287 /// @param result Set to true if \a path is a regular file, false if it is not.
288 /// Undefined otherwise.
289 /// @results errc::success if result has been successfully set, otherwise a
290 /// platform specific error_code.
291 error_code is_regular_file(const Twine &path, bool &result);
293 /// @brief Does this status represent something that exists but is not a
294 /// directory, regular file, or symlink?
296 /// @param status A file_status previously returned from status.
297 /// @results exists(s) && !is_regular_file(s) && !is_directory(s) &&
299 bool is_other(file_status status);
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 status.type() == symlink_file.
315 bool is_symlink(file_status status);
317 /// @brief Is path a symlink?
319 /// @param path Input path.
320 /// @param result Set to true if \a path is a symlink, false if it is not.
321 /// Undefined otherwise.
322 /// @results errc::success if result has been successfully set, otherwise a
323 /// platform specific error_code.
324 error_code is_symlink(const Twine &path, bool &result);
326 /// @brief Get file status as if by POSIX stat().
328 /// @param path Input path.
329 /// @param result Set to the file status.
330 /// @results errc::success if result has been successfully set, otherwise a
331 /// platform specific error_code.
332 error_code status(const Twine &path, file_status &result);
334 /// @brief Is status available?
336 /// @param path Input path.
337 /// @results True if status() != status_error.
338 bool status_known(file_status s);
340 /// @brief Is status available?
342 /// @param path Input path.
343 /// @param result Set to true if status() != status_error.
344 /// @results errc::success if result has been successfully set, otherwise a
345 /// platform specific error_code.
346 error_code status_known(const Twine &path, bool &result);
348 /// @brief Generate a unique path and open it as a file.
350 /// Generates a unique path suitable for a temporary file and then opens it as a
351 /// file. The name is based on \a model with '%' replaced by a random char in
352 /// [0-9a-f]. If \a model is not an absolute path, a suitable temporary
353 /// directory will be prepended.
355 /// This is an atomic operation. Either the file is created and opened, or the
356 /// file system is left untouched.
358 /// clang-%%-%%-%%-%%-%%.s => /tmp/clang-a0-b1-c2-d3-e4.s
360 /// @param model Name to base unique path off of.
361 /// @param result_fs Set to the opened file's file descriptor.
362 /// @param result_path Set to the opened file's absolute path.
363 /// @param makeAbsolute If true and @model is not an absolute path, a temp
364 /// directory will be prepended.
365 /// @results errc::success if result_{fd,path} have been successfully set,
366 /// otherwise a platform specific error_code.
367 error_code unique_file(const Twine &model, int &result_fd,
368 SmallVectorImpl<char> &result_path,
369 bool makeAbsolute = true);
371 /// @brief Canonicalize path.
373 /// Sets result to the file system's idea of what path is. The result is always
374 /// absolute and has the same capitalization as the file system.
376 /// @param path Input path.
377 /// @param result Set to the canonicalized version of \a path.
378 /// @results errc::success if result has been successfully set, otherwise a
379 /// platform specific error_code.
380 error_code canonicalize(const Twine &path, SmallVectorImpl<char> &result);
382 /// @brief Are \a path's first bytes \a magic?
384 /// @param path Input path.
385 /// @param magic Byte sequence to compare \a path's first len(magic) bytes to.
386 /// @results errc::success if result has been successfully set, otherwise a
387 /// platform specific error_code.
388 error_code has_magic(const Twine &path, const Twine &magic, bool &result);
390 /// @brief Get \a path's first \a len bytes.
392 /// @param path Input path.
393 /// @param len Number of magic bytes to get.
394 /// @param result Set to the first \a len bytes in the file pointed to by
395 /// \a path. Or the entire file if file_size(path) < len, in which
396 /// case result.size() returns the size of the file.
397 /// @results errc::success if result has been successfully set,
398 /// errc::value_too_large if len is larger then the file pointed to by
399 /// \a path, otherwise a platform specific error_code.
400 error_code get_magic(const Twine &path, uint32_t len,
401 SmallVectorImpl<char> &result);
403 /// @brief Get and identify \a path's type based on its content.
405 /// @param path Input path.
406 /// @param result Set to the type of file, or LLVMFileType::Unknown_FileType.
407 /// @results errc::success if result has been successfully set, otherwise a
408 /// platform specific error_code.
409 error_code identify_magic(const Twine &path, LLVMFileType &result);
411 /// @brief Get library paths the system linker uses.
413 /// @param result Set to the list of system library paths.
414 /// @results errc::success if result has been successfully set, otherwise a
415 /// platform specific error_code.
416 error_code GetSystemLibraryPaths(SmallVectorImpl<std::string> &result);
418 /// @brief Get bitcode library paths the system linker uses
419 /// + LLVM_LIB_SEARCH_PATH + LLVM_LIBDIR.
421 /// @param result Set to the list of bitcode library paths.
422 /// @results errc::success if result has been successfully set, otherwise a
423 /// platform specific error_code.
424 error_code GetBitcodeLibraryPaths(SmallVectorImpl<std::string> &result);
426 /// @brief Find a library.
428 /// Find the path to a library using its short name. Use the system
429 /// dependent library paths to locate the library.
431 /// c => /usr/lib/libc.so
433 /// @param short_name Library name one would give to the system linker.
434 /// @param result Set to the absolute path \a short_name represents.
435 /// @results errc::success if result has been successfully set, otherwise a
436 /// platform specific error_code.
437 error_code FindLibrary(const Twine &short_name, SmallVectorImpl<char> &result);
439 /// @brief Get absolute path of main executable.
441 /// @param argv0 The program name as it was spelled on the command line.
442 /// @param MainAddr Address of some symbol in the executable (not in a library).
443 /// @param result Set to the absolute path of the current executable.
444 /// @results errc::success if result has been successfully set, otherwise a
445 /// platform specific error_code.
446 error_code GetMainExecutable(const char *argv0, void *MainAddr,
447 SmallVectorImpl<char> &result);
453 /// directory_entry - A single entry in a directory. Caches the status either
454 /// from the result of the iteration syscall, or the first time status is
456 class directory_entry {
458 mutable file_status Status;
461 explicit directory_entry(const Twine &path, file_status st = file_status())
467 void assign(const Twine &path, file_status st = file_status()) {
472 void replace_filename(const Twine &filename, file_status st = file_status());
474 const std::string &path() const { return Path; }
475 error_code status(file_status &result) const;
477 bool operator==(const directory_entry& rhs) const { return Path == rhs.Path; }
478 bool operator!=(const directory_entry& rhs) const { return !(*this == rhs); }
479 bool operator< (const directory_entry& rhs) const;
480 bool operator<=(const directory_entry& rhs) const;
481 bool operator> (const directory_entry& rhs) const;
482 bool operator>=(const directory_entry& rhs) const;
488 error_code directory_iterator_construct(DirIterState&, StringRef);
489 error_code directory_iterator_increment(DirIterState&);
490 error_code directory_iterator_destruct(DirIterState&);
492 /// DirIterState - Keeps state for the directory_iterator. It is reference
493 /// counted in order to preserve InputIterator semantics on copy.
494 struct DirIterState : public RefCountedBase<DirIterState> {
496 : IterationHandle(0) {}
499 directory_iterator_destruct(*this);
502 intptr_t IterationHandle;
503 directory_entry CurrentEntry;
507 /// directory_iterator - Iterates through the entries in path. There is no
508 /// operator++ because we need an error_code. If it's really needed we can make
509 /// it call report_fatal_error on error.
510 class directory_iterator {
511 IntrusiveRefCntPtr<detail::DirIterState> State;
514 explicit directory_iterator(const Twine &path, error_code &ec) {
515 State = new detail::DirIterState;
516 SmallString<128> path_storage;
517 ec = detail::directory_iterator_construct(*State,
518 path.toStringRef(path_storage));
521 explicit directory_iterator(const directory_entry &de, error_code &ec) {
522 State = new detail::DirIterState;
523 ec = detail::directory_iterator_construct(*State, de.path());
526 /// Construct end iterator.
527 directory_iterator() : State(new detail::DirIterState) {}
529 // No operator++ because we need error_code.
530 directory_iterator &increment(error_code &ec) {
531 ec = directory_iterator_increment(*State);
535 const directory_entry &operator*() const { return State->CurrentEntry; }
536 const directory_entry *operator->() const { return &State->CurrentEntry; }
538 bool operator==(const directory_iterator &RHS) const {
539 return State->CurrentEntry == RHS.State->CurrentEntry;
542 bool operator!=(const directory_iterator &RHS) const {
543 return !(*this == RHS);
545 // Other members as required by
546 // C++ Std, 24.1.1 Input iterators [input.iterators]
550 /// RecDirIterState - Keeps state for the recursive_directory_iterator. It is
551 /// reference counted in order to preserve InputIterator semantics on copy.
552 struct RecDirIterState : public RefCountedBase<RecDirIterState> {
555 , HasNoPushRequest(false) {}
557 std::stack<directory_iterator, std::vector<directory_iterator> > Stack;
559 bool HasNoPushRequest;
563 /// recursive_directory_iterator - Same as directory_iterator except for it
564 /// recurses down into child directories.
565 class recursive_directory_iterator {
566 IntrusiveRefCntPtr<detail::RecDirIterState> State;
569 recursive_directory_iterator() {}
570 explicit recursive_directory_iterator(const Twine &path, error_code &ec)
571 : State(new detail::RecDirIterState) {
572 State->Stack.push(directory_iterator(path, ec));
573 if (State->Stack.top() == directory_iterator())
576 // No operator++ because we need error_code.
577 recursive_directory_iterator &increment(error_code &ec) {
578 static const directory_iterator end_itr;
580 if (State->HasNoPushRequest)
581 State->HasNoPushRequest = false;
584 if ((ec = State->Stack.top()->status(st))) return *this;
585 if (is_directory(st)) {
586 State->Stack.push(directory_iterator(*State->Stack.top(), ec));
587 if (ec) return *this;
588 if (State->Stack.top() != end_itr) {
596 while (!State->Stack.empty()
597 && State->Stack.top().increment(ec) == end_itr) {
602 // Check if we are done. If so, create an end iterator.
603 if (State->Stack.empty())
609 const directory_entry &operator*() const { return *State->Stack.top(); };
610 const directory_entry *operator->() const { return &*State->Stack.top(); };
613 /// Gets the current level. Starting path is at level 0.
614 int level() const { return State->Level; }
616 /// Returns true if no_push has been called for this directory_entry.
617 bool no_push_request() const { return State->HasNoPushRequest; }
620 /// Goes up one level if Level > 0.
622 assert(State && "Cannot pop and end itertor!");
623 assert(State->Level > 0 && "Cannot pop an iterator with level < 1");
625 static const directory_iterator end_itr;
629 report_fatal_error("Error incrementing directory iterator.");
632 } while (!State->Stack.empty()
633 && State->Stack.top().increment(ec) == end_itr);
635 // Check if we are done. If so, create an end iterator.
636 if (State->Stack.empty())
640 /// Does not go down into the current directory_entry.
641 void no_push() { State->HasNoPushRequest = true; }
643 bool operator==(const recursive_directory_iterator &RHS) const {
644 return State == RHS.State;
647 bool operator!=(const recursive_directory_iterator &RHS) const {
648 return !(*this == RHS);
650 // Other members as required by
651 // C++ Std, 24.1.1 Input iterators [input.iterators]
656 } // end namespace fs
657 } // end namespace sys
658 } // end namespace llvm