1 //===- llvm/Support/Path.h - Path Operating System 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::Path class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_SYSTEM_PATH_H
15 #define LLVM_SYSTEM_PATH_H
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/Support/TimeValue.h"
26 /// This structure provides basic file system information about a file. It
27 /// is patterned after the stat(2) Unix operating system call but made
28 /// platform independent and eliminates many of the unix-specific fields.
29 /// However, to support llvm-ar, the mode, user, and group fields are
30 /// retained. These pertain to unix security and may not have a meaningful
31 /// value on non-Unix platforms. However, the other fields should
32 /// always be applicable on all platforms. The structure is filled in by
33 /// the PathWithStatus class.
34 /// @brief File status structure
37 uint64_t fileSize; ///< Size of the file in bytes
38 TimeValue modTime; ///< Time of file's modification
39 uint32_t mode; ///< Mode of the file, if applicable
40 uint32_t user; ///< User ID of owner, if applicable
41 uint32_t group; ///< Group ID of owner, if applicable
42 uint64_t uniqueID; ///< A number to uniquely ID this file
43 bool isDir : 1; ///< True if this is a directory.
44 bool isFile : 1; ///< True if this is a file.
46 FileStatus() : fileSize(0), modTime(0,0), mode(0777), user(999),
47 group(999), uniqueID(0), isDir(false), isFile(false) { }
49 TimeValue getTimestamp() const { return modTime; }
50 uint64_t getSize() const { return fileSize; }
51 uint32_t getMode() const { return mode; }
52 uint32_t getUser() const { return user; }
53 uint32_t getGroup() const { return group; }
54 uint64_t getUniqueID() const { return uniqueID; }
57 /// This class provides an abstraction for the path to a file or directory
58 /// in the operating system's filesystem and provides various basic operations
59 /// on it. Note that this class only represents the name of a path to a file
60 /// or directory which may or may not be valid for a given machine's file
61 /// system. The class is patterned after the java.io.File class with various
62 /// extensions and several omissions (not relevant to LLVM). A Path object
63 /// ensures that the path it encapsulates is syntactically valid for the
64 /// operating system it is running on but does not ensure correctness for
65 /// any particular file system. That is, a syntactically valid path might
66 /// specify path components that do not exist in the file system and using
67 /// such a Path to act on the file system could produce errors. There is one
68 /// invalid Path value which is permitted: the empty path. The class should
69 /// never allow a syntactically invalid non-empty path name to be assigned.
70 /// Empty paths are required in order to indicate an error result in some
71 /// situations. If the path is empty, the isValid operation will return
72 /// false. All operations will fail if isValid is false. Operations that
73 /// change the path will either return false if it would cause a syntactically
74 /// invalid path name (in which case the Path object is left unchanged) or
75 /// throw an std::string exception indicating the error. The methods are
76 /// grouped into four basic categories: Path Accessors (provide information
77 /// about the path without accessing disk), Disk Accessors (provide
78 /// information about the underlying file or directory), Path Mutators
79 /// (change the path information, not the disk), and Disk Mutators (change
80 /// the disk file/directory referenced by the path). The Disk Mutator methods
81 /// all have the word "disk" embedded in their method name to reinforce the
82 /// notion that the operation modifies the file system.
84 /// @brief An abstraction for operating system paths.
86 /// @name Constructors
89 /// Construct a path to the root directory of the file system. The root
90 /// directory is a top level directory above which there are no more
91 /// directories. For example, on UNIX, the root directory is /. On Windows
92 /// it is file:///. Other operating systems may have different notions of
93 /// what the root directory is or none at all. In that case, a consistent
94 /// default root directory will be used.
95 static Path GetRootDirectory();
97 /// Construct a path to a unique temporary directory that is created in
98 /// a "standard" place for the operating system. The directory is
99 /// guaranteed to be created on exit from this function. If the directory
100 /// cannot be created, the function will throw an exception.
101 /// @returns an invalid path (empty) on error
102 /// @param ErrMsg Optional place for an error message if an error occurs
103 /// @brief Constrct a path to an new, unique, existing temporary
105 static Path GetTemporaryDirectory(std::string* ErrMsg = 0);
107 /// Construct a vector of sys::Path that contains the "standard" system
108 /// library paths suitable for linking into programs.
109 /// @brief Construct a path to the system library directory
110 static void GetSystemLibraryPaths(std::vector<sys::Path>& Paths);
112 /// Construct a vector of sys::Path that contains the "standard" bitcode
113 /// library paths suitable for linking into an llvm program. This function
114 /// *must* return the value of LLVM_LIB_SEARCH_PATH as well as the value
115 /// of LLVM_LIBDIR. It also must provide the System library paths as
116 /// returned by GetSystemLibraryPaths.
117 /// @see GetSystemLibraryPaths
118 /// @brief Construct a list of directories in which bitcode could be
120 static void GetBitcodeLibraryPaths(std::vector<sys::Path>& Paths);
122 /// Find the path to a library using its short name. Use the system
123 /// dependent library paths to locate the library.
124 /// @brief Find a library.
125 static Path FindLibrary(std::string& short_name);
127 /// Construct a path to the default LLVM configuration directory. The
128 /// implementation must ensure that this is a well-known (same on many
129 /// systems) directory in which llvm configuration files exist. For
130 /// example, on Unix, the /etc/llvm directory has been selected.
131 /// @brief Construct a path to the default LLVM configuration directory
132 static Path GetLLVMDefaultConfigDir();
134 /// Construct a path to the LLVM installed configuration directory. The
135 /// implementation must ensure that this refers to the "etc" directory of
136 /// the LLVM installation. This is the location where configuration files
137 /// will be located for a particular installation of LLVM on a machine.
138 /// @brief Construct a path to the LLVM installed configuration directory
139 static Path GetLLVMConfigDir();
141 /// Construct a path to the current user's home directory. The
142 /// implementation must use an operating system specific mechanism for
143 /// determining the user's home directory. For example, the environment
144 /// variable "HOME" could be used on Unix. If a given operating system
145 /// does not have the concept of a user's home directory, this static
146 /// constructor must provide the same result as GetRootDirectory.
147 /// @brief Construct a path to the current user's "home" directory
148 static Path GetUserHomeDirectory();
150 /// Construct a path to the current directory for the current process.
151 /// @returns The current working directory.
152 /// @brief Returns the current working directory.
153 static Path GetCurrentDirectory();
155 /// Return the suffix commonly used on file names that contain an
157 /// @returns The executable file suffix for the current platform.
158 /// @brief Return the executable file suffix.
159 static StringRef GetEXESuffix();
161 /// Return the suffix commonly used on file names that contain a shared
162 /// object, shared archive, or dynamic link library. Such files are
163 /// linked at runtime into a process and their code images are shared
164 /// between processes.
165 /// @returns The dynamic link library suffix for the current platform.
166 /// @brief Return the dynamic link library suffix.
167 static StringRef GetDLLSuffix();
169 /// GetMainExecutable - Return the path to the main executable, given the
170 /// value of argv[0] from program startup and the address of main itself.
171 /// In extremis, this function may fail and return an empty path.
172 static Path GetMainExecutable(const char *argv0, void *MainAddr);
174 /// This is one of the very few ways in which a path can be constructed
175 /// with a syntactically invalid name. The only *legal* invalid name is an
176 /// empty one. Other invalid names are not permitted. Empty paths are
177 /// provided so that they can be used to indicate null or error results in
178 /// other lib/System functionality.
179 /// @brief Construct an empty (and invalid) path.
181 Path(const Path &that) : path(that.path) {}
183 /// This constructor will accept a char* or std::string as a path. No
184 /// checking is done on this path to determine if it is valid. To
185 /// determine validity of the path, use the isValid method.
186 /// @param p The path to assign.
187 /// @brief Construct a Path from a string.
188 explicit Path(StringRef p);
190 /// This constructor will accept a character range as a path. No checking
191 /// is done on this path to determine if it is valid. To determine
192 /// validity of the path, use the isValid method.
193 /// @param StrStart A pointer to the first character of the path name
194 /// @param StrLen The length of the path name at StrStart
195 /// @brief Construct a Path from a string.
196 Path(const char *StrStart, unsigned StrLen);
202 /// Makes a copy of \p that to \p this.
204 /// @brief Assignment Operator
205 Path &operator=(const Path &that) {
210 /// Makes a copy of \p that to \p this.
211 /// @param that A StringRef denoting the path
213 /// @brief Assignment Operator
214 Path &operator=(StringRef that);
216 /// Compares \p this Path with \p that Path for equality.
217 /// @returns true if \p this and \p that refer to the same thing.
218 /// @brief Equality Operator
219 bool operator==(const Path &that) const;
221 /// Compares \p this Path with \p that Path for inequality.
222 /// @returns true if \p this and \p that refer to different things.
223 /// @brief Inequality Operator
224 bool operator!=(const Path &that) const { return !(*this == that); }
226 /// Determines if \p this Path is less than \p that Path. This is required
227 /// so that Path objects can be placed into ordered collections (e.g.
228 /// std::map). The comparison is done lexicographically as defined by
229 /// the std::string::compare method.
230 /// @returns true if \p this path is lexicographically less than \p that.
231 /// @brief Less Than Operator
232 bool operator<(const Path& that) const;
235 /// @name Path Accessors
238 /// This function will use an operating system specific algorithm to
239 /// determine if the current value of \p this is a syntactically valid
240 /// path name for the operating system. The path name does not need to
241 /// exist, validity is simply syntactical. Empty paths are always invalid.
242 /// @returns true iff the path name is syntactically legal for the
243 /// host operating system.
244 /// @brief Determine if a path is syntactically valid or not.
245 bool isValid() const;
247 /// This function determines if the contents of the path name are empty.
248 /// That is, the path name has a zero length. This does NOT determine if
249 /// if the file is empty. To get the length of the file itself, Use the
250 /// PathWithStatus::getFileStatus() method and then the getSize() method
251 /// on the returned FileStatus object.
252 /// @returns true iff the path is empty.
253 /// @brief Determines if the path name is empty (invalid).
254 bool isEmpty() const { return path.empty(); }
256 /// This function returns the last component of the path name. The last
257 /// component is the file or directory name occuring after the last
258 /// directory separator. If no directory separator is present, the entire
259 /// path name is returned (i.e. same as toString).
260 /// @returns StringRef containing the last component of the path name.
261 /// @brief Returns the last component of the path name.
262 StringRef getLast() const;
264 /// This function strips off the path and suffix of the file or directory
265 /// name and returns just the basename. For example /a/foo.bar would cause
266 /// this function to return "foo".
267 /// @returns StringRef containing the basename of the path
268 /// @brief Get the base name of the path
269 StringRef getBasename() const;
271 /// This function strips off the suffix of the path beginning with the
272 /// path separator ('/' on Unix, '\' on Windows) and returns the result.
273 StringRef getDirname() const;
275 /// This function strips off the path and basename(up to and
276 /// including the last dot) of the file or directory name and
277 /// returns just the suffix. For example /a/foo.bar would cause
278 /// this function to return "bar".
279 /// @returns StringRef containing the suffix of the path
280 /// @brief Get the suffix of the path
281 StringRef getSuffix() const;
283 /// Obtain a 'C' string for the path name.
284 /// @returns a 'C' string containing the path name.
285 /// @brief Returns the path as a C string.
286 const char *c_str() const { return path.c_str(); }
287 const std::string &str() const { return path; }
290 /// size - Return the length in bytes of this path name.
291 size_t size() const { return path.size(); }
293 /// empty - Returns true if the path is empty.
294 unsigned empty() const { return path.empty(); }
297 /// @name Disk Accessors
300 /// This function determines if the path name is absolute, as opposed to
302 /// @brief Determine if the path is absolute.
303 bool isAbsolute() const;
305 /// This function determines if the path name is absolute, as opposed to
307 /// @brief Determine if the path is absolute.
308 static bool isAbsolute(const char *NameStart, unsigned NameLen);
310 /// This function opens the file associated with the path name provided by
311 /// the Path object and reads its magic number. If the magic number at the
312 /// start of the file matches \p magic, true is returned. In all other
313 /// cases (file not found, file not accessible, etc.) it returns false.
314 /// @returns true if the magic number of the file matches \p magic.
315 /// @brief Determine if file has a specific magic number
316 bool hasMagicNumber(StringRef magic) const;
318 /// This function retrieves the first \p len bytes of the file associated
319 /// with \p this. These bytes are returned as the "magic number" in the
320 /// \p Magic parameter.
321 /// @returns true if the Path is a file and the magic number is retrieved,
323 /// @brief Get the file's magic number.
324 bool getMagicNumber(std::string& Magic, unsigned len) const;
326 /// This function determines if the path name in the object references an
327 /// archive file by looking at its magic number.
328 /// @returns true if the file starts with the magic number for an archive
330 /// @brief Determine if the path references an archive file.
331 bool isArchive() const;
333 /// This function determines if the path name in the object references an
334 /// LLVM Bitcode file by looking at its magic number.
335 /// @returns true if the file starts with the magic number for LLVM
337 /// @brief Determine if the path references a bitcode file.
338 bool isBitcodeFile() const;
340 /// This function determines if the path name in the object references a
341 /// native Dynamic Library (shared library, shared object) by looking at
342 /// the file's magic number. The Path object must reference a file, not a
344 /// @returns true if the file starts with the magic number for a native
346 /// @brief Determine if the path references a dynamic library.
347 bool isDynamicLibrary() const;
349 /// This function determines if the path name in the object references a
350 /// native object file by looking at it's magic number. The term object
351 /// file is defined as "an organized collection of separate, named
352 /// sequences of binary data." This covers the obvious file formats such
353 /// as COFF and ELF, but it also includes llvm ir bitcode, archives,
354 /// libraries, etc...
355 /// @returns true if the file starts with the magic number for an object
357 /// @brief Determine if the path references an object file.
358 bool isObjectFile() const;
360 /// This function determines if the path name references an existing file
361 /// or directory in the file system.
362 /// @returns true if the pathname references an existing file or
364 /// @brief Determines if the path is a file or directory in
368 /// This function determines if the path name references an
369 /// existing directory.
370 /// @returns true if the pathname references an existing directory.
371 /// @brief Determines if the path is a directory in the file system.
372 bool isDirectory() const;
374 /// This function determines if the path name references an
375 /// existing symbolic link.
376 /// @returns true if the pathname references an existing symlink.
377 /// @brief Determines if the path is a symlink in the file system.
378 bool isSymLink() const;
380 /// This function determines if the path name references a readable file
381 /// or directory in the file system. This function checks for
382 /// the existence and readability (by the current program) of the file
384 /// @returns true if the pathname references a readable file.
385 /// @brief Determines if the path is a readable file or directory
386 /// in the file system.
387 bool canRead() const;
389 /// This function determines if the path name references a writable file
390 /// or directory in the file system. This function checks for the
391 /// existence and writability (by the current program) of the file or
393 /// @returns true if the pathname references a writable file.
394 /// @brief Determines if the path is a writable file or directory
395 /// in the file system.
396 bool canWrite() const;
398 /// This function checks that what we're trying to work only on a regular
399 /// file. Check for things like /dev/null, any block special file, or
400 /// other things that aren't "regular" regular files.
401 /// @returns true if the file is S_ISREG.
402 /// @brief Determines if the file is a regular file
403 bool isRegularFile() const;
405 /// This function determines if the path name references an executable
406 /// file in the file system. This function checks for the existence and
407 /// executability (by the current program) of the file.
408 /// @returns true if the pathname references an executable file.
409 /// @brief Determines if the path is an executable file in the file
411 bool canExecute() const;
413 /// This function builds a list of paths that are the names of the
414 /// files and directories in a directory.
415 /// @returns true if an error occurs, true otherwise
416 /// @brief Build a list of directory's contents.
417 bool getDirectoryContents(
418 std::set<Path> &paths, ///< The resulting list of file & directory names
419 std::string* ErrMsg ///< Optional place to return an error message.
423 /// @name Path Mutators
426 /// The path name is cleared and becomes empty. This is an invalid
427 /// path name but is the *only* invalid path name. This is provided
428 /// so that path objects can be used to indicate the lack of a
429 /// valid path being found.
430 /// @brief Make the path empty.
431 void clear() { path.clear(); }
433 /// This method sets the Path object to \p unverified_path. This can fail
434 /// if the \p unverified_path does not pass the syntactic checks of the
435 /// isValid() method. If verification fails, the Path object remains
436 /// unchanged and false is returned. Otherwise true is returned and the
437 /// Path object takes on the path value of \p unverified_path
438 /// @returns true if the path was set, false otherwise.
439 /// @param unverified_path The path to be set in Path object.
440 /// @brief Set a full path from a StringRef
441 bool set(StringRef unverified_path);
443 /// One path component is removed from the Path. If only one component is
444 /// present in the path, the Path object becomes empty. If the Path object
445 /// is empty, no change is made.
446 /// @returns false if the path component could not be removed.
447 /// @brief Removes the last directory component of the Path.
448 bool eraseComponent();
450 /// The \p component is added to the end of the Path if it is a legal
451 /// name for the operating system. A directory separator will be added if
453 /// @returns false if the path component could not be added.
454 /// @brief Appends one path component to the Path.
455 bool appendComponent(StringRef component);
457 /// A period and the \p suffix are appended to the end of the pathname.
458 /// When the \p suffix is empty, no action is performed.
459 /// @brief Adds a period and the \p suffix to the end of the pathname.
460 void appendSuffix(StringRef suffix);
462 /// The suffix of the filename is erased. The suffix begins with and
463 /// includes the last . character in the filename after the last directory
464 /// separator and extends until the end of the name. If no . character is
465 /// after the last directory separator, then the file name is left
466 /// unchanged (i.e. it was already without a suffix) but the function
468 /// @returns false if there was no suffix to remove, true otherwise.
469 /// @brief Remove the suffix from a path name.
472 /// The current Path name is made unique in the file system. Upon return,
473 /// the Path will have been changed to make a unique file in the file
474 /// system or it will not have been changed if the current path name is
476 /// @throws std::string if an unrecoverable error occurs.
477 /// @brief Make the current path name unique in the file system.
478 bool makeUnique( bool reuse_current /*= true*/, std::string* ErrMsg );
480 /// The current Path name is made absolute by prepending the
481 /// current working directory if necessary.
485 /// @name Disk Mutators
488 /// This method attempts to make the file referenced by the Path object
489 /// available for reading so that the canRead() method will return true.
490 /// @brief Make the file readable;
491 bool makeReadableOnDisk(std::string* ErrMsg = 0);
493 /// This method attempts to make the file referenced by the Path object
494 /// available for writing so that the canWrite() method will return true.
495 /// @brief Make the file writable;
496 bool makeWriteableOnDisk(std::string* ErrMsg = 0);
498 /// This method attempts to make the file referenced by the Path object
499 /// available for execution so that the canExecute() method will return
501 /// @brief Make the file readable;
502 bool makeExecutableOnDisk(std::string* ErrMsg = 0);
504 /// This method allows the last modified time stamp and permission bits
505 /// to be set on the disk object referenced by the Path.
506 /// @throws std::string if an error occurs.
507 /// @returns true on error.
508 /// @brief Set the status information.
509 bool setStatusInfoOnDisk(const FileStatus &SI,
510 std::string *ErrStr = 0) const;
512 /// This method attempts to create a directory in the file system with the
513 /// same name as the Path object. The \p create_parents parameter controls
514 /// whether intermediate directories are created or not. if \p
515 /// create_parents is true, then an attempt will be made to create all
516 /// intermediate directories, as needed. If \p create_parents is false,
517 /// then only the final directory component of the Path name will be
518 /// created. The created directory will have no entries.
519 /// @returns true if the directory could not be created, false otherwise
520 /// @brief Create the directory this Path refers to.
521 bool createDirectoryOnDisk(
522 bool create_parents = false, ///< Determines whether non-existent
523 ///< directory components other than the last one (the "parents")
524 ///< are created or not.
525 std::string* ErrMsg = 0 ///< Optional place to put error messages.
528 /// This method attempts to create a file in the file system with the same
529 /// name as the Path object. The intermediate directories must all exist
530 /// at the time this method is called. Use createDirectoriesOnDisk to
531 /// accomplish that. The created file will be empty upon return from this
533 /// @returns true if the file could not be created, false otherwise.
534 /// @brief Create the file this Path refers to.
535 bool createFileOnDisk(
536 std::string* ErrMsg = 0 ///< Optional place to put error messages.
539 /// This is like createFile except that it creates a temporary file. A
540 /// unique temporary file name is generated based on the contents of
541 /// \p this before the call. The new name is assigned to \p this and the
542 /// file is created. Note that this will both change the Path object
543 /// *and* create the corresponding file. This function will ensure that
544 /// the newly generated temporary file name is unique in the file system.
545 /// @returns true if the file couldn't be created, false otherwise.
546 /// @brief Create a unique temporary file
547 bool createTemporaryFileOnDisk(
548 bool reuse_current = false, ///< When set to true, this parameter
549 ///< indicates that if the current file name does not exist then
550 ///< it will be used without modification.
551 std::string* ErrMsg = 0 ///< Optional place to put error messages
554 /// This method renames the file referenced by \p this as \p newName. The
555 /// file referenced by \p this must exist. The file referenced by
556 /// \p newName does not need to exist.
557 /// @returns true on error, false otherwise
558 /// @brief Rename one file as another.
559 bool renamePathOnDisk(const Path& newName, std::string* ErrMsg);
561 /// This method attempts to destroy the file or directory named by the
562 /// last component of the Path. If the Path refers to a directory and the
563 /// \p destroy_contents is false, an attempt will be made to remove just
564 /// the directory (the final Path component). If \p destroy_contents is
565 /// true, an attempt will be made to remove the entire contents of the
566 /// directory, recursively. If the Path refers to a file, the
567 /// \p destroy_contents parameter is ignored.
568 /// @param destroy_contents Indicates whether the contents of a destroyed
569 /// @param Err An optional string to receive an error message.
570 /// directory should also be destroyed (recursively).
571 /// @returns false if the file/directory was destroyed, true on error.
572 /// @brief Removes the file or directory from the filesystem.
573 bool eraseFromDisk(bool destroy_contents = false,
574 std::string *Err = 0) const;
577 /// MapInFilePages - This is a low level system API to map in the file
578 /// that is currently opened as FD into the current processes' address
579 /// space for read only access. This function may return null on failure
580 /// or if the system cannot provide the following constraints:
581 /// 1) The pages must be valid after the FD is closed, until
582 /// UnMapFilePages is called.
583 /// 2) Any padding after the end of the file must be zero filled, if
585 /// 3) The pages must be contiguous.
587 /// This API is not intended for general use, clients should use
588 /// MemoryBuffer::getFile instead.
589 static const char *MapInFilePages(int FD, uint64_t FileSize);
591 /// UnMapFilePages - Free pages mapped into the current process by
594 /// This API is not intended for general use, clients should use
595 /// MemoryBuffer::getFile instead.
596 static void UnMapFilePages(const char *Base, uint64_t FileSize);
602 // Our win32 implementation relies on this string being mutable.
603 mutable std::string path; ///< Storage for the path name.
609 /// This class is identical to Path class except it allows you to obtain the
610 /// file status of the Path as well. The reason for the distinction is one of
611 /// efficiency. First, the file status requires additional space and the space
612 /// is incorporated directly into PathWithStatus without an additional malloc.
613 /// Second, obtaining status information is an expensive operation on most
614 /// operating systems so we want to be careful and explicity about where we
615 /// allow this operation in LLVM.
616 /// @brief Path with file status class.
617 class PathWithStatus : public Path {
618 /// @name Constructors
621 /// @brief Default constructor
622 PathWithStatus() : Path(), status(), fsIsValid(false) {}
624 /// @brief Copy constructor
625 PathWithStatus(const PathWithStatus &that)
626 : Path(static_cast<const Path&>(that)), status(that.status),
627 fsIsValid(that.fsIsValid) {}
629 /// This constructor allows construction from a Path object
630 /// @brief Path constructor
631 PathWithStatus(const Path &other)
632 : Path(other), status(), fsIsValid(false) {}
634 /// This constructor will accept a char* or std::string as a path. No
635 /// checking is done on this path to determine if it is valid. To
636 /// determine validity of the path, use the isValid method.
637 /// @brief Construct a Path from a string.
638 explicit PathWithStatus(
639 StringRef p ///< The path to assign.
640 ) : Path(p), status(), fsIsValid(false) {}
642 /// This constructor will accept a character range as a path. No checking
643 /// is done on this path to determine if it is valid. To determine
644 /// validity of the path, use the isValid method.
645 /// @brief Construct a Path from a string.
646 explicit PathWithStatus(
647 const char *StrStart, ///< Pointer to the first character of the path
648 unsigned StrLen ///< Length of the path.
649 ) : Path(StrStart, StrLen), status(), fsIsValid(false) {}
651 /// Makes a copy of \p that to \p this.
653 /// @brief Assignment Operator
654 PathWithStatus &operator=(const PathWithStatus &that) {
655 static_cast<Path&>(*this) = static_cast<const Path&>(that);
656 status = that.status;
657 fsIsValid = that.fsIsValid;
661 /// Makes a copy of \p that to \p this.
663 /// @brief Assignment Operator
664 PathWithStatus &operator=(const Path &that) {
665 static_cast<Path&>(*this) = static_cast<const Path&>(that);
674 /// This function returns status information about the file. The type of
675 /// path (file or directory) is updated to reflect the actual contents
676 /// of the file system.
677 /// @returns 0 on failure, with Error explaining why (if non-zero)
678 /// @returns a pointer to a FileStatus structure on success.
679 /// @brief Get file status.
680 const FileStatus *getFileStatus(
681 bool forceUpdate = false, ///< Force an update from the file system
682 std::string *Error = 0 ///< Optional place to return an error msg.
689 mutable FileStatus status; ///< Status information.
690 mutable bool fsIsValid; ///< Whether we've obtained it or not
695 /// This enumeration delineates the kinds of files that LLVM knows about.
697 Unknown_FileType = 0, ///< Unrecognized file
698 Bitcode_FileType, ///< Bitcode file
699 Archive_FileType, ///< ar style archive file
700 ELF_Relocatable_FileType, ///< ELF Relocatable object file
701 ELF_Executable_FileType, ///< ELF Executable image
702 ELF_SharedObject_FileType, ///< ELF dynamically linked shared lib
703 ELF_Core_FileType, ///< ELF core image
704 Mach_O_Object_FileType, ///< Mach-O Object file
705 Mach_O_Executable_FileType, ///< Mach-O Executable
706 Mach_O_FixedVirtualMemorySharedLib_FileType, ///< Mach-O Shared Lib, FVM
707 Mach_O_Core_FileType, ///< Mach-O Core File
708 Mach_O_PreloadExecutable_FileType, ///< Mach-O Preloaded Executable
709 Mach_O_DynamicallyLinkedSharedLib_FileType, ///< Mach-O dynlinked shared lib
710 Mach_O_DynamicLinker_FileType, ///< The Mach-O dynamic linker
711 Mach_O_Bundle_FileType, ///< Mach-O Bundle file
712 Mach_O_DynamicallyLinkedSharedLibStub_FileType, ///< Mach-O Shared lib stub
713 COFF_FileType ///< COFF object file or lib
716 /// This utility function allows any memory block to be examined in order
717 /// to determine its file type.
718 LLVMFileType IdentifyFileType(const char*magic, unsigned length);
720 /// This function can be used to copy the file specified by Src to the
721 /// file specified by Dest. If an error occurs, Dest is removed.
722 /// @returns true if an error occurs, false otherwise
723 /// @brief Copy one file to another.
724 bool CopyFile(const Path& Dest, const Path& Src, std::string* ErrMsg);
726 /// This is the OS-specific path separator: a colon on Unix or a semicolon
728 extern const char PathSeparator;