Path.h revision 53ca1f3190680f3e86aebe0f72f7918d63f71e0d
1//===- llvm/Support/Path.h - Path Operating System Concept -------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file declares the llvm::sys::Path class.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_SYSTEM_PATH_H
15#define LLVM_SYSTEM_PATH_H
16
17#include "llvm/ADT/StringRef.h"
18#include "llvm/Support/TimeValue.h"
19#include <set>
20#include <string>
21#include <vector>
22
23namespace llvm {
24namespace sys {
25
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
35  class FileStatus {
36  public:
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.
45
46    FileStatus() : fileSize(0), modTime(0,0), mode(0777), user(999),
47                   group(999), uniqueID(0), isDir(false), isFile(false) { }
48
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; }
55  };
56
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.
83  /// @since 1.4
84  /// @brief An abstraction for operating system paths.
85  class Path {
86    /// @name Constructors
87    /// @{
88    public:
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();
96
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
104      /// directory.
105      static Path GetTemporaryDirectory(std::string* ErrMsg = 0);
106
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);
111
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
119      /// found.
120      static void GetBitcodeLibraryPaths(std::vector<sys::Path>& Paths);
121
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);
126
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();
133
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();
140
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();
149
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();
154
155      /// Return the suffix commonly used on file names that contain an
156      /// executable.
157      /// @returns The executable file suffix for the current platform.
158      /// @brief Return the executable file suffix.
159      static StringRef GetEXESuffix();
160
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();
168
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);
173
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.
180      Path() : path() {}
181      Path(const Path &that) : path(that.path) {}
182
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);
189
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);
197
198    /// @}
199    /// @name Operators
200    /// @{
201    public:
202      /// Makes a copy of \p that to \p this.
203      /// @returns \p this
204      /// @brief Assignment Operator
205      Path &operator=(const Path &that) {
206        path = that.path;
207        return *this;
208      }
209
210      /// Makes a copy of \p that to \p this.
211      /// @param that A StringRef denoting the path
212      /// @returns \p this
213      /// @brief Assignment Operator
214      Path &operator=(StringRef that);
215
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;
220
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); }
225
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;
233
234    /// @}
235    /// @name Path Accessors
236    /// @{
237    public:
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;
246
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(); }
255
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;
263
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;
270
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;
274
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;
282
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; }
288
289
290      /// size - Return the length in bytes of this path name.
291      size_t size() const { return path.size(); }
292
293      /// empty - Returns true if the path is empty.
294      unsigned empty() const { return path.empty(); }
295
296    /// @}
297    /// @name Disk Accessors
298    /// @{
299    public:
300      /// This function determines if the path name is absolute, as opposed to
301      /// relative.
302      /// @brief Determine if the path is absolute.
303      bool isAbsolute() const;
304
305      /// This function determines if the path name is absolute, as opposed to
306      /// relative.
307      /// @brief Determine if the path is absolute.
308      static bool isAbsolute(const char *NameStart, unsigned NameLen);
309
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;
317
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,
322      /// false otherwise.
323      /// @brief Get the file's magic number.
324      bool getMagicNumber(std::string& Magic, unsigned len) const;
325
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
329      /// file.
330      /// @brief Determine if the path references an archive file.
331      bool isArchive() const;
332
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
336      /// bitcode files.
337      /// @brief Determine if the path references a bitcode file.
338      bool isBitcodeFile() const;
339
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
343      /// directory.
344      /// @returns true if the file starts with the magic number for a native
345      /// shared library.
346      /// @brief Determine if the path references a dynamic library.
347      bool isDynamicLibrary() const;
348
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
356      /// file.
357      /// @brief Determine if the path references an object file.
358      bool isObjectFile() const;
359
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
363      /// directory.
364      /// @brief Determines if the path is a file or directory in
365      /// the file system.
366      bool exists() const;
367
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;
373
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;
379
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
383      /// or directory.
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;
388
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
392      /// directory.
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;
397
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;
404
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
410      /// system.
411      bool canExecute() const;
412
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.
420      ) const;
421
422    /// @}
423    /// @name Path Mutators
424    /// @{
425    public:
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(); }
432
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);
442
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();
449
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
452      /// needed.
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);
456
457      /// A period and the \p suffix are appended to the end of the pathname.
458      /// The precondition for this function is that the Path reference a file
459      /// name (i.e. isFile() returns true). If the Path is not a file, no
460      /// action is taken and the function returns false. If the path would
461      /// become invalid for the host operating system, false is returned. When
462      /// the \p suffix is empty, no action is performed.
463      /// @returns false if the suffix could not be added, true if it was.
464      /// @brief Adds a period and the \p suffix to the end of the pathname.
465      bool appendSuffix(StringRef suffix);
466
467      /// The suffix of the filename is erased. The suffix begins with and
468      /// includes the last . character in the filename after the last directory
469      /// separator and extends until the end of the name. If no . character is
470      /// after the last directory separator, then the file name is left
471      /// unchanged (i.e. it was already without a suffix) but the function
472      /// returns false.
473      /// @returns false if there was no suffix to remove, true otherwise.
474      /// @brief Remove the suffix from a path name.
475      bool eraseSuffix();
476
477      /// The current Path name is made unique in the file system. Upon return,
478      /// the Path will have been changed to make a unique file in the file
479      /// system or it will not have been changed if the current path name is
480      /// already unique.
481      /// @throws std::string if an unrecoverable error occurs.
482      /// @brief Make the current path name unique in the file system.
483      bool makeUnique( bool reuse_current /*= true*/, std::string* ErrMsg );
484
485      /// The current Path name is made absolute by prepending the
486      /// current working directory if necessary.
487      void makeAbsolute();
488
489    /// @}
490    /// @name Disk Mutators
491    /// @{
492    public:
493      /// This method attempts to make the file referenced by the Path object
494      /// available for reading so that the canRead() method will return true.
495      /// @brief Make the file readable;
496      bool makeReadableOnDisk(std::string* ErrMsg = 0);
497
498      /// This method attempts to make the file referenced by the Path object
499      /// available for writing so that the canWrite() method will return true.
500      /// @brief Make the file writable;
501      bool makeWriteableOnDisk(std::string* ErrMsg = 0);
502
503      /// This method attempts to make the file referenced by the Path object
504      /// available for execution so that the canExecute() method will return
505      /// true.
506      /// @brief Make the file readable;
507      bool makeExecutableOnDisk(std::string* ErrMsg = 0);
508
509      /// This method allows the last modified time stamp and permission bits
510      /// to be set on the disk object referenced by the Path.
511      /// @throws std::string if an error occurs.
512      /// @returns true on error.
513      /// @brief Set the status information.
514      bool setStatusInfoOnDisk(const FileStatus &SI,
515                               std::string *ErrStr = 0) const;
516
517      /// This method attempts to create a directory in the file system with the
518      /// same name as the Path object. The \p create_parents parameter controls
519      /// whether intermediate directories are created or not. if \p
520      /// create_parents is true, then an attempt will be made to create all
521      /// intermediate directories, as needed. If \p create_parents is false,
522      /// then only the final directory component of the Path name will be
523      /// created. The created directory will have no entries.
524      /// @returns true if the directory could not be created, false otherwise
525      /// @brief Create the directory this Path refers to.
526      bool createDirectoryOnDisk(
527        bool create_parents = false, ///<  Determines whether non-existent
528           ///< directory components other than the last one (the "parents")
529           ///< are created or not.
530        std::string* ErrMsg = 0 ///< Optional place to put error messages.
531      );
532
533      /// This method attempts to create a file in the file system with the same
534      /// name as the Path object. The intermediate directories must all exist
535      /// at the time this method is called. Use createDirectoriesOnDisk to
536      /// accomplish that. The created file will be empty upon return from this
537      /// function.
538      /// @returns true if the file could not be created, false otherwise.
539      /// @brief Create the file this Path refers to.
540      bool createFileOnDisk(
541        std::string* ErrMsg = 0 ///< Optional place to put error messages.
542      );
543
544      /// This is like createFile except that it creates a temporary file. A
545      /// unique temporary file name is generated based on the contents of
546      /// \p this before the call. The new name is assigned to \p this and the
547      /// file is created.  Note that this will both change the Path object
548      /// *and* create the corresponding file. This function will ensure that
549      /// the newly generated temporary file name is unique in the file system.
550      /// @returns true if the file couldn't be created, false otherwise.
551      /// @brief Create a unique temporary file
552      bool createTemporaryFileOnDisk(
553        bool reuse_current = false, ///< When set to true, this parameter
554          ///< indicates that if the current file name does not exist then
555          ///< it will be used without modification.
556        std::string* ErrMsg = 0 ///< Optional place to put error messages
557      );
558
559      /// This method renames the file referenced by \p this as \p newName. The
560      /// file referenced by \p this must exist. The file referenced by
561      /// \p newName does not need to exist.
562      /// @returns true on error, false otherwise
563      /// @brief Rename one file as another.
564      bool renamePathOnDisk(const Path& newName, std::string* ErrMsg);
565
566      /// This method attempts to destroy the file or directory named by the
567      /// last component of the Path. If the Path refers to a directory and the
568      /// \p destroy_contents is false, an attempt will be made to remove just
569      /// the directory (the final Path component). If \p destroy_contents is
570      /// true, an attempt will be made to remove the entire contents of the
571      /// directory, recursively. If the Path refers to a file, the
572      /// \p destroy_contents parameter is ignored.
573      /// @param destroy_contents Indicates whether the contents of a destroyed
574      /// @param Err An optional string to receive an error message.
575      /// directory should also be destroyed (recursively).
576      /// @returns false if the file/directory was destroyed, true on error.
577      /// @brief Removes the file or directory from the filesystem.
578      bool eraseFromDisk(bool destroy_contents = false,
579                         std::string *Err = 0) const;
580
581
582      /// MapInFilePages - This is a low level system API to map in the file
583      /// that is currently opened as FD into the current processes' address
584      /// space for read only access.  This function may return null on failure
585      /// or if the system cannot provide the following constraints:
586      ///  1) The pages must be valid after the FD is closed, until
587      ///     UnMapFilePages is called.
588      ///  2) Any padding after the end of the file must be zero filled, if
589      ///     present.
590      ///  3) The pages must be contiguous.
591      ///
592      /// This API is not intended for general use, clients should use
593      /// MemoryBuffer::getFile instead.
594      static const char *MapInFilePages(int FD, uint64_t FileSize);
595
596      /// UnMapFilePages - Free pages mapped into the current process by
597      /// MapInFilePages.
598      ///
599      /// This API is not intended for general use, clients should use
600      /// MemoryBuffer::getFile instead.
601      static void UnMapFilePages(const char *Base, uint64_t FileSize);
602
603    /// @}
604    /// @name Data
605    /// @{
606    protected:
607      // Our win32 implementation relies on this string being mutable.
608      mutable std::string path;   ///< Storage for the path name.
609
610
611    /// @}
612  };
613
614  /// This class is identical to Path class except it allows you to obtain the
615  /// file status of the Path as well. The reason for the distinction is one of
616  /// efficiency. First, the file status requires additional space and the space
617  /// is incorporated directly into PathWithStatus without an additional malloc.
618  /// Second, obtaining status information is an expensive operation on most
619  /// operating systems so we want to be careful and explicity about where we
620  /// allow this operation in LLVM.
621  /// @brief Path with file status class.
622  class PathWithStatus : public Path {
623    /// @name Constructors
624    /// @{
625    public:
626      /// @brief Default constructor
627      PathWithStatus() : Path(), status(), fsIsValid(false) {}
628
629      /// @brief Copy constructor
630      PathWithStatus(const PathWithStatus &that)
631        : Path(static_cast<const Path&>(that)), status(that.status),
632           fsIsValid(that.fsIsValid) {}
633
634      /// This constructor allows construction from a Path object
635      /// @brief Path constructor
636      PathWithStatus(const Path &other)
637        : Path(other), status(), fsIsValid(false) {}
638
639      /// This constructor will accept a char* or std::string as a path. No
640      /// checking is done on this path to determine if it is valid. To
641      /// determine validity of the path, use the isValid method.
642      /// @brief Construct a Path from a string.
643      explicit PathWithStatus(
644        StringRef p ///< The path to assign.
645      ) : Path(p), status(), fsIsValid(false) {}
646
647      /// This constructor will accept a character range as a path.  No checking
648      /// is done on this path to determine if it is valid.  To determine
649      /// validity of the path, use the isValid method.
650      /// @brief Construct a Path from a string.
651      explicit PathWithStatus(
652        const char *StrStart,  ///< Pointer to the first character of the path
653        unsigned StrLen        ///< Length of the path.
654      ) : Path(StrStart, StrLen), status(), fsIsValid(false) {}
655
656      /// Makes a copy of \p that to \p this.
657      /// @returns \p this
658      /// @brief Assignment Operator
659      PathWithStatus &operator=(const PathWithStatus &that) {
660        static_cast<Path&>(*this) = static_cast<const Path&>(that);
661        status = that.status;
662        fsIsValid = that.fsIsValid;
663        return *this;
664      }
665
666      /// Makes a copy of \p that to \p this.
667      /// @returns \p this
668      /// @brief Assignment Operator
669      PathWithStatus &operator=(const Path &that) {
670        static_cast<Path&>(*this) = static_cast<const Path&>(that);
671        fsIsValid = false;
672        return *this;
673      }
674
675    /// @}
676    /// @name Methods
677    /// @{
678    public:
679      /// This function returns status information about the file. The type of
680      /// path (file or directory) is updated to reflect the actual contents
681      /// of the file system.
682      /// @returns 0 on failure, with Error explaining why (if non-zero)
683      /// @returns a pointer to a FileStatus structure on success.
684      /// @brief Get file status.
685      const FileStatus *getFileStatus(
686        bool forceUpdate = false, ///< Force an update from the file system
687        std::string *Error = 0    ///< Optional place to return an error msg.
688      ) const;
689
690    /// @}
691    /// @name Data
692    /// @{
693    private:
694      mutable FileStatus status; ///< Status information.
695      mutable bool fsIsValid;    ///< Whether we've obtained it or not
696
697    /// @}
698  };
699
700  /// This enumeration delineates the kinds of files that LLVM knows about.
701  enum LLVMFileType {
702    Unknown_FileType = 0,              ///< Unrecognized file
703    Bitcode_FileType,                  ///< Bitcode file
704    Archive_FileType,                  ///< ar style archive file
705    ELF_Relocatable_FileType,          ///< ELF Relocatable object file
706    ELF_Executable_FileType,           ///< ELF Executable image
707    ELF_SharedObject_FileType,         ///< ELF dynamically linked shared lib
708    ELF_Core_FileType,                 ///< ELF core image
709    Mach_O_Object_FileType,            ///< Mach-O Object file
710    Mach_O_Executable_FileType,        ///< Mach-O Executable
711    Mach_O_FixedVirtualMemorySharedLib_FileType, ///< Mach-O Shared Lib, FVM
712    Mach_O_Core_FileType,              ///< Mach-O Core File
713    Mach_O_PreloadExecutable_FileType, ///< Mach-O Preloaded Executable
714    Mach_O_DynamicallyLinkedSharedLib_FileType, ///< Mach-O dynlinked shared lib
715    Mach_O_DynamicLinker_FileType,     ///< The Mach-O dynamic linker
716    Mach_O_Bundle_FileType,            ///< Mach-O Bundle file
717    Mach_O_DynamicallyLinkedSharedLibStub_FileType, ///< Mach-O Shared lib stub
718    COFF_FileType                      ///< COFF object file or lib
719  };
720
721  /// This utility function allows any memory block to be examined in order
722  /// to determine its file type.
723  LLVMFileType IdentifyFileType(const char*magic, unsigned length);
724
725  /// This function can be used to copy the file specified by Src to the
726  /// file specified by Dest. If an error occurs, Dest is removed.
727  /// @returns true if an error occurs, false otherwise
728  /// @brief Copy one file to another.
729  bool CopyFile(const Path& Dest, const Path& Src, std::string* ErrMsg);
730
731  /// This is the OS-specific path separator: a colon on Unix or a semicolon
732  /// on Windows.
733  extern const char PathSeparator;
734}
735
736}
737
738#endif
739