1 //===- llvm/Support/PathV1.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/Compiler.h" 19 #include "llvm/Support/TimeValue.h" 20 #include <set> 21 #include <string> 22 #include <vector> 23 24 #define LLVM_PATH_DEPRECATED_MSG(replacement) \ 25 "PathV1 has been deprecated and will be removed as soon as all LLVM and" \ 26 " Clang clients have been moved over to PathV2. Please use `" #replacement \ 27 "` from PathV2 instead." 28 29 namespace llvm { 30 namespace sys { 31 32 /// This structure provides basic file system information about a file. It 33 /// is patterned after the stat(2) Unix operating system call but made 34 /// platform independent and eliminates many of the unix-specific fields. 35 /// However, to support llvm-ar, the mode, user, and group fields are 36 /// retained. These pertain to unix security and may not have a meaningful 37 /// value on non-Unix platforms. However, the other fields should 38 /// always be applicable on all platforms. The structure is filled in by 39 /// the PathWithStatus class. 40 /// @brief File status structure 41 class FileStatus { 42 public: 43 uint64_t fileSize; ///< Size of the file in bytes 44 TimeValue modTime; ///< Time of file's modification 45 uint32_t mode; ///< Mode of the file, if applicable 46 uint32_t user; ///< User ID of owner, if applicable 47 uint32_t group; ///< Group ID of owner, if applicable 48 uint64_t uniqueID; ///< A number to uniquely ID this file 49 bool isDir : 1; ///< True if this is a directory. 50 bool isFile : 1; ///< True if this is a file. 51 52 FileStatus() : fileSize(0), modTime(0,0), mode(0777), user(999), 53 group(999), uniqueID(0), isDir(false), isFile(false) { } 54 55 TimeValue getTimestamp() const { return modTime; } 56 uint64_t getSize() const { return fileSize; } 57 uint32_t getMode() const { return mode; } 58 uint32_t getUser() const { return user; } 59 uint32_t getGroup() const { return group; } 60 uint64_t getUniqueID() const { return uniqueID; } 61 }; 62 63 /// This class provides an abstraction for the path to a file or directory 64 /// in the operating system's filesystem and provides various basic operations 65 /// on it. Note that this class only represents the name of a path to a file 66 /// or directory which may or may not be valid for a given machine's file 67 /// system. The class is patterned after the java.io.File class with various 68 /// extensions and several omissions (not relevant to LLVM). A Path object 69 /// ensures that the path it encapsulates is syntactically valid for the 70 /// operating system it is running on but does not ensure correctness for 71 /// any particular file system. That is, a syntactically valid path might 72 /// specify path components that do not exist in the file system and using 73 /// such a Path to act on the file system could produce errors. There is one 74 /// invalid Path value which is permitted: the empty path. The class should 75 /// never allow a syntactically invalid non-empty path name to be assigned. 76 /// Empty paths are required in order to indicate an error result in some 77 /// situations. If the path is empty, the isValid operation will return 78 /// false. All operations will fail if isValid is false. Operations that 79 /// change the path will either return false if it would cause a syntactically 80 /// invalid path name (in which case the Path object is left unchanged) or 81 /// throw an std::string exception indicating the error. The methods are 82 /// grouped into four basic categories: Path Accessors (provide information 83 /// about the path without accessing disk), Disk Accessors (provide 84 /// information about the underlying file or directory), Path Mutators 85 /// (change the path information, not the disk), and Disk Mutators (change 86 /// the disk file/directory referenced by the path). The Disk Mutator methods 87 /// all have the word "disk" embedded in their method name to reinforce the 88 /// notion that the operation modifies the file system. 89 /// @since 1.4 90 /// @brief An abstraction for operating system paths. 91 class Path { 92 /// @name Constructors 93 /// @{ 94 public: 95 /// Construct a path to the root directory of the file system. The root 96 /// directory is a top level directory above which there are no more 97 /// directories. For example, on UNIX, the root directory is /. On Windows 98 /// it is file:///. Other operating systems may have different notions of 99 /// what the root directory is or none at all. In that case, a consistent 100 /// default root directory will be used. 101 LLVM_ATTRIBUTE_DEPRECATED(static Path GetRootDirectory(), 102 LLVM_PATH_DEPRECATED_MSG(NOTHING)); 103 104 /// Construct a path to a unique temporary directory that is created in 105 /// a "standard" place for the operating system. The directory is 106 /// guaranteed to be created on exit from this function. If the directory 107 /// cannot be created, the function will throw an exception. 108 /// @returns an invalid path (empty) on error 109 /// @param ErrMsg Optional place for an error message if an error occurs 110 /// @brief Construct a path to an new, unique, existing temporary 111 /// directory. 112 static Path GetTemporaryDirectory(std::string* ErrMsg = 0); 113 114 /// Construct a vector of sys::Path that contains the "standard" system 115 /// library paths suitable for linking into programs. 116 /// @brief Construct a path to the system library directory 117 static void GetSystemLibraryPaths(std::vector<sys::Path>& Paths); 118 119 /// Construct a vector of sys::Path that contains the "standard" bitcode 120 /// library paths suitable for linking into an llvm program. This function 121 /// *must* return the value of LLVM_LIB_SEARCH_PATH as well as the value 122 /// of LLVM_LIBDIR. It also must provide the System library paths as 123 /// returned by GetSystemLibraryPaths. 124 /// @see GetSystemLibraryPaths 125 /// @brief Construct a list of directories in which bitcode could be 126 /// found. 127 static void GetBitcodeLibraryPaths(std::vector<sys::Path>& Paths); 128 129 /// Find the path to a library using its short name. Use the system 130 /// dependent library paths to locate the library. 131 /// @brief Find a library. 132 static Path FindLibrary(std::string& short_name); 133 134 /// Construct a path to the current user's home directory. The 135 /// implementation must use an operating system specific mechanism for 136 /// determining the user's home directory. For example, the environment 137 /// variable "HOME" could be used on Unix. If a given operating system 138 /// does not have the concept of a user's home directory, this static 139 /// constructor must provide the same result as GetRootDirectory. 140 /// @brief Construct a path to the current user's "home" directory 141 static Path GetUserHomeDirectory(); 142 143 /// Construct a path to the current directory for the current process. 144 /// @returns The current working directory. 145 /// @brief Returns the current working directory. 146 static Path GetCurrentDirectory(); 147 148 /// Return the suffix commonly used on file names that contain an 149 /// executable. 150 /// @returns The executable file suffix for the current platform. 151 /// @brief Return the executable file suffix. 152 static StringRef GetEXESuffix(); 153 154 /// Return the suffix commonly used on file names that contain a shared 155 /// object, shared archive, or dynamic link library. Such files are 156 /// linked at runtime into a process and their code images are shared 157 /// between processes. 158 /// @returns The dynamic link library suffix for the current platform. 159 /// @brief Return the dynamic link library suffix. 160 static StringRef GetDLLSuffix(); 161 162 /// GetMainExecutable - Return the path to the main executable, given the 163 /// value of argv[0] from program startup and the address of main itself. 164 /// In extremis, this function may fail and return an empty path. 165 static Path GetMainExecutable(const char *argv0, void *MainAddr); 166 167 /// This is one of the very few ways in which a path can be constructed 168 /// with a syntactically invalid name. The only *legal* invalid name is an 169 /// empty one. Other invalid names are not permitted. Empty paths are 170 /// provided so that they can be used to indicate null or error results in 171 /// other lib/System functionality. 172 /// @brief Construct an empty (and invalid) path. 173 Path() : path() {} 174 Path(const Path &that) : path(that.path) {} 175 176 /// This constructor will accept a char* or std::string as a path. No 177 /// checking is done on this path to determine if it is valid. To 178 /// determine validity of the path, use the isValid method. 179 /// @param p The path to assign. 180 /// @brief Construct a Path from a string. 181 explicit Path(StringRef p); 182 183 /// This constructor will accept a character range as a path. No checking 184 /// is done on this path to determine if it is valid. To determine 185 /// validity of the path, use the isValid method. 186 /// @param StrStart A pointer to the first character of the path name 187 /// @param StrLen The length of the path name at StrStart 188 /// @brief Construct a Path from a string. 189 Path(const char *StrStart, unsigned StrLen); 190 191 /// @} 192 /// @name Operators 193 /// @{ 194 public: 195 /// Makes a copy of \p that to \p this. 196 /// @returns \p this 197 /// @brief Assignment Operator 198 Path &operator=(const Path &that) { 199 path = that.path; 200 return *this; 201 } 202 203 /// Makes a copy of \p that to \p this. 204 /// @param that A StringRef denoting the path 205 /// @returns \p this 206 /// @brief Assignment Operator 207 Path &operator=(StringRef that); 208 209 /// Compares \p this Path with \p that Path for equality. 210 /// @returns true if \p this and \p that refer to the same thing. 211 /// @brief Equality Operator 212 bool operator==(const Path &that) const; 213 214 /// Compares \p this Path with \p that Path for inequality. 215 /// @returns true if \p this and \p that refer to different things. 216 /// @brief Inequality Operator 217 bool operator!=(const Path &that) const { return !(*this == that); } 218 219 /// Determines if \p this Path is less than \p that Path. This is required 220 /// so that Path objects can be placed into ordered collections (e.g. 221 /// std::map). The comparison is done lexicographically as defined by 222 /// the std::string::compare method. 223 /// @returns true if \p this path is lexicographically less than \p that. 224 /// @brief Less Than Operator 225 bool operator<(const Path& that) const; 226 227 /// @} 228 /// @name Path Accessors 229 /// @{ 230 public: 231 /// This function will use an operating system specific algorithm to 232 /// determine if the current value of \p this is a syntactically valid 233 /// path name for the operating system. The path name does not need to 234 /// exist, validity is simply syntactical. Empty paths are always invalid. 235 /// @returns true iff the path name is syntactically legal for the 236 /// host operating system. 237 /// @brief Determine if a path is syntactically valid or not. 238 bool isValid() const; 239 240 /// This function determines if the contents of the path name are empty. 241 /// That is, the path name has a zero length. This does NOT determine if 242 /// if the file is empty. To get the length of the file itself, Use the 243 /// PathWithStatus::getFileStatus() method and then the getSize() method 244 /// on the returned FileStatus object. 245 /// @returns true iff the path is empty. 246 /// @brief Determines if the path name is empty (invalid). 247 bool isEmpty() const { return path.empty(); } 248 249 /// This function returns the last component of the path name. The last 250 /// component is the file or directory name occurring after the last 251 /// directory separator. If no directory separator is present, the entire 252 /// path name is returned (i.e. same as toString). 253 /// @returns StringRef containing the last component of the path name. 254 /// @brief Returns the last component of the path name. 255 LLVM_ATTRIBUTE_DEPRECATED( 256 StringRef getLast() const, 257 LLVM_PATH_DEPRECATED_MSG(path::filename)); 258 259 /// This function strips off the path and suffix of the file or directory 260 /// name and returns just the basename. For example /a/foo.bar would cause 261 /// this function to return "foo". 262 /// @returns StringRef containing the basename of the path 263 /// @brief Get the base name of the path 264 LLVM_ATTRIBUTE_DEPRECATED(StringRef getBasename() const, 265 LLVM_PATH_DEPRECATED_MSG(path::stem)); 266 267 /// This function strips off the suffix of the path beginning with the 268 /// path separator ('/' on Unix, '\' on Windows) and returns the result. 269 LLVM_ATTRIBUTE_DEPRECATED(StringRef getDirname() const, 270 LLVM_PATH_DEPRECATED_MSG(path::parent_path)); 271 272 /// This function strips off the path and basename(up to and 273 /// including the last dot) of the file or directory name and 274 /// returns just the suffix. For example /a/foo.bar would cause 275 /// this function to return "bar". 276 /// @returns StringRef containing the suffix of the path 277 /// @brief Get the suffix of the path 278 LLVM_ATTRIBUTE_DEPRECATED(StringRef getSuffix() const, 279 LLVM_PATH_DEPRECATED_MSG(path::extension)); 280 281 /// Obtain a 'C' string for the path name. 282 /// @returns a 'C' string containing the path name. 283 /// @brief Returns the path as a C string. 284 const char *c_str() const { return path.c_str(); } 285 const std::string &str() const { return path; } 286 287 288 /// size - Return the length in bytes of this path name. 289 size_t size() const { return path.size(); } 290 291 /// empty - Returns true if the path is empty. 292 unsigned empty() const { return path.empty(); } 293 294 /// @} 295 /// @name Disk Accessors 296 /// @{ 297 public: 298 /// This function determines if the path name is absolute, as opposed to 299 /// relative. 300 /// @brief Determine if the path is absolute. 301 LLVM_ATTRIBUTE_DEPRECATED( 302 bool isAbsolute() const, 303 LLVM_PATH_DEPRECATED_MSG(path::is_absolute)); 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 LLVM_ATTRIBUTE_DEPRECATED( 309 static bool isAbsolute(const char *NameStart, unsigned NameLen), 310 LLVM_PATH_DEPRECATED_MSG(path::is_absolute)); 311 312 /// This function opens the file associated with the path name provided by 313 /// the Path object and reads its magic number. If the magic number at the 314 /// start of the file matches \p magic, true is returned. In all other 315 /// cases (file not found, file not accessible, etc.) it returns false. 316 /// @returns true if the magic number of the file matches \p magic. 317 /// @brief Determine if file has a specific magic number 318 LLVM_ATTRIBUTE_DEPRECATED(bool hasMagicNumber(StringRef magic) const, 319 LLVM_PATH_DEPRECATED_MSG(fs::has_magic)); 320 321 /// This function retrieves the first \p len bytes of the file associated 322 /// with \p this. These bytes are returned as the "magic number" in the 323 /// \p Magic parameter. 324 /// @returns true if the Path is a file and the magic number is retrieved, 325 /// false otherwise. 326 /// @brief Get the file's magic number. 327 bool getMagicNumber(std::string& Magic, unsigned len) const; 328 329 /// This function determines if the path name in the object references an 330 /// archive file by looking at its magic number. 331 /// @returns true if the file starts with the magic number for an archive 332 /// file. 333 /// @brief Determine if the path references an archive file. 334 bool isArchive() const; 335 336 /// This function determines if the path name in the object references an 337 /// LLVM Bitcode file by looking at its magic number. 338 /// @returns true if the file starts with the magic number for LLVM 339 /// bitcode files. 340 /// @brief Determine if the path references a bitcode file. 341 bool isBitcodeFile() const; 342 343 /// This function determines if the path name in the object references a 344 /// native Dynamic Library (shared library, shared object) by looking at 345 /// the file's magic number. The Path object must reference a file, not a 346 /// directory. 347 /// @returns true if the file starts with the magic number for a native 348 /// shared library. 349 /// @brief Determine if the path references a dynamic library. 350 bool isDynamicLibrary() const; 351 352 /// This function determines if the path name in the object references a 353 /// native object file by looking at it's magic number. The term object 354 /// file is defined as "an organized collection of separate, named 355 /// sequences of binary data." This covers the obvious file formats such 356 /// as COFF and ELF, but it also includes llvm ir bitcode, archives, 357 /// libraries, etc... 358 /// @returns true if the file starts with the magic number for an object 359 /// file. 360 /// @brief Determine if the path references an object file. 361 bool isObjectFile() const; 362 363 /// This function determines if the path name references an existing file 364 /// or directory in the file system. 365 /// @returns true if the pathname references an existing file or 366 /// directory. 367 /// @brief Determines if the path is a file or directory in 368 /// the file system. 369 LLVM_ATTRIBUTE_DEPRECATED(bool exists() const, 370 LLVM_PATH_DEPRECATED_MSG(fs::exists)); 371 372 /// This function determines if the path name references an 373 /// existing directory. 374 /// @returns true if the pathname references an existing directory. 375 /// @brief Determines if the path is a directory in the file system. 376 LLVM_ATTRIBUTE_DEPRECATED(bool isDirectory() const, 377 LLVM_PATH_DEPRECATED_MSG(fs::is_directory)); 378 379 /// This function determines if the path name references an 380 /// existing symbolic link. 381 /// @returns true if the pathname references an existing symlink. 382 /// @brief Determines if the path is a symlink in the file system. 383 LLVM_ATTRIBUTE_DEPRECATED(bool isSymLink() const, 384 LLVM_PATH_DEPRECATED_MSG(fs::is_symlink)); 385 386 /// This function determines if the path name references a readable file 387 /// or directory in the file system. This function checks for 388 /// the existence and readability (by the current program) of the file 389 /// or directory. 390 /// @returns true if the pathname references a readable file. 391 /// @brief Determines if the path is a readable file or directory 392 /// in the file system. 393 bool canRead() const; 394 395 /// This function determines if the path name references a writable file 396 /// or directory in the file system. This function checks for the 397 /// existence and writability (by the current program) of the file or 398 /// directory. 399 /// @returns true if the pathname references a writable file. 400 /// @brief Determines if the path is a writable file or directory 401 /// in the file system. 402 bool canWrite() const; 403 404 /// This function checks that what we're trying to work only on a regular 405 /// file. Check for things like /dev/null, any block special file, or 406 /// other things that aren't "regular" regular files. 407 /// @returns true if the file is S_ISREG. 408 /// @brief Determines if the file is a regular file 409 bool isRegularFile() const; 410 411 /// This function determines if the path name references an executable 412 /// file in the file system. This function checks for the existence and 413 /// executability (by the current program) of the file. 414 /// @returns true if the pathname references an executable file. 415 /// @brief Determines if the path is an executable file in the file 416 /// system. 417 bool canExecute() const; 418 419 /// This function builds a list of paths that are the names of the 420 /// files and directories in a directory. 421 /// @returns true if an error occurs, true otherwise 422 /// @brief Build a list of directory's contents. 423 bool getDirectoryContents( 424 std::set<Path> &paths, ///< The resulting list of file & directory names 425 std::string* ErrMsg ///< Optional place to return an error message. 426 ) const; 427 428 /// @} 429 /// @name Path Mutators 430 /// @{ 431 public: 432 /// The path name is cleared and becomes empty. This is an invalid 433 /// path name but is the *only* invalid path name. This is provided 434 /// so that path objects can be used to indicate the lack of a 435 /// valid path being found. 436 /// @brief Make the path empty. 437 void clear() { path.clear(); } 438 439 /// This method sets the Path object to \p unverified_path. This can fail 440 /// if the \p unverified_path does not pass the syntactic checks of the 441 /// isValid() method. If verification fails, the Path object remains 442 /// unchanged and false is returned. Otherwise true is returned and the 443 /// Path object takes on the path value of \p unverified_path 444 /// @returns true if the path was set, false otherwise. 445 /// @param unverified_path The path to be set in Path object. 446 /// @brief Set a full path from a StringRef 447 bool set(StringRef unverified_path); 448 449 /// One path component is removed from the Path. If only one component is 450 /// present in the path, the Path object becomes empty. If the Path object 451 /// is empty, no change is made. 452 /// @returns false if the path component could not be removed. 453 /// @brief Removes the last directory component of the Path. 454 bool eraseComponent(); 455 456 /// The \p component is added to the end of the Path if it is a legal 457 /// name for the operating system. A directory separator will be added if 458 /// needed. 459 /// @returns false if the path component could not be added. 460 /// @brief Appends one path component to the Path. 461 bool appendComponent(StringRef component); 462 463 /// A period and the \p suffix are appended to the end of the pathname. 464 /// When the \p suffix is empty, no action is performed. 465 /// @brief Adds a period and the \p suffix to the end of the pathname. 466 void appendSuffix(StringRef suffix); 467 468 /// The suffix of the filename is erased. The suffix begins with and 469 /// includes the last . character in the filename after the last directory 470 /// separator and extends until the end of the name. If no . character is 471 /// after the last directory separator, then the file name is left 472 /// unchanged (i.e. it was already without a suffix) but the function 473 /// returns false. 474 /// @returns false if there was no suffix to remove, true otherwise. 475 /// @brief Remove the suffix from a path name. 476 bool eraseSuffix(); 477 478 /// The current Path name is made unique in the file system. Upon return, 479 /// the Path will have been changed to make a unique file in the file 480 /// system or it will not have been changed if the current path name is 481 /// already unique. 482 /// @throws std::string if an unrecoverable error occurs. 483 /// @brief Make the current path name unique in the file system. 484 bool makeUnique( bool reuse_current /*= true*/, std::string* ErrMsg ); 485 486 /// The current Path name is made absolute by prepending the 487 /// current working directory if necessary. 488 LLVM_ATTRIBUTE_DEPRECATED( 489 void makeAbsolute(), 490 LLVM_PATH_DEPRECATED_MSG(fs::make_absolute)); 491 492 /// @} 493 /// @name Disk Mutators 494 /// @{ 495 public: 496 /// This method attempts to make the file referenced by the Path object 497 /// available for reading so that the canRead() method will return true. 498 /// @brief Make the file readable; 499 bool makeReadableOnDisk(std::string* ErrMsg = 0); 500 501 /// This method attempts to make the file referenced by the Path object 502 /// available for writing so that the canWrite() method will return true. 503 /// @brief Make the file writable; 504 bool makeWriteableOnDisk(std::string* ErrMsg = 0); 505 506 /// This method attempts to make the file referenced by the Path object 507 /// available for execution so that the canExecute() method will return 508 /// true. 509 /// @brief Make the file readable; 510 bool makeExecutableOnDisk(std::string* ErrMsg = 0); 511 512 /// This method allows the last modified time stamp and permission bits 513 /// to be set on the disk object referenced by the Path. 514 /// @throws std::string if an error occurs. 515 /// @returns true on error. 516 /// @brief Set the status information. 517 bool setStatusInfoOnDisk(const FileStatus &SI, 518 std::string *ErrStr = 0) const; 519 520 /// This method attempts to create a directory in the file system with the 521 /// same name as the Path object. The \p create_parents parameter controls 522 /// whether intermediate directories are created or not. if \p 523 /// create_parents is true, then an attempt will be made to create all 524 /// intermediate directories, as needed. If \p create_parents is false, 525 /// then only the final directory component of the Path name will be 526 /// created. The created directory will have no entries. 527 /// @returns true if the directory could not be created, false otherwise 528 /// @brief Create the directory this Path refers to. 529 bool createDirectoryOnDisk( 530 bool create_parents = false, ///< Determines whether non-existent 531 ///< directory components other than the last one (the "parents") 532 ///< are created or not. 533 std::string* ErrMsg = 0 ///< Optional place to put error messages. 534 ); 535 536 /// This method attempts to create a file in the file system with the same 537 /// name as the Path object. The intermediate directories must all exist 538 /// at the time this method is called. Use createDirectoriesOnDisk to 539 /// accomplish that. The created file will be empty upon return from this 540 /// function. 541 /// @returns true if the file could not be created, false otherwise. 542 /// @brief Create the file this Path refers to. 543 bool createFileOnDisk( 544 std::string* ErrMsg = 0 ///< Optional place to put error messages. 545 ); 546 547 /// This is like createFile except that it creates a temporary file. A 548 /// unique temporary file name is generated based on the contents of 549 /// \p this before the call. The new name is assigned to \p this and the 550 /// file is created. Note that this will both change the Path object 551 /// *and* create the corresponding file. This function will ensure that 552 /// the newly generated temporary file name is unique in the file system. 553 /// @returns true if the file couldn't be created, false otherwise. 554 /// @brief Create a unique temporary file 555 bool createTemporaryFileOnDisk( 556 bool reuse_current = false, ///< When set to true, this parameter 557 ///< indicates that if the current file name does not exist then 558 ///< it will be used without modification. 559 std::string* ErrMsg = 0 ///< Optional place to put error messages 560 ); 561 562 /// This method renames the file referenced by \p this as \p newName. The 563 /// file referenced by \p this must exist. The file referenced by 564 /// \p newName does not need to exist. 565 /// @returns true on error, false otherwise 566 /// @brief Rename one file as another. 567 bool renamePathOnDisk(const Path& newName, std::string* ErrMsg); 568 569 /// This method attempts to destroy the file or directory named by the 570 /// last component of the Path. If the Path refers to a directory and the 571 /// \p destroy_contents is false, an attempt will be made to remove just 572 /// the directory (the final Path component). If \p destroy_contents is 573 /// true, an attempt will be made to remove the entire contents of the 574 /// directory, recursively. If the Path refers to a file, the 575 /// \p destroy_contents parameter is ignored. 576 /// @param destroy_contents Indicates whether the contents of a destroyed 577 /// @param Err An optional string to receive an error message. 578 /// directory should also be destroyed (recursively). 579 /// @returns false if the file/directory was destroyed, true on error. 580 /// @brief Removes the file or directory from the filesystem. 581 bool eraseFromDisk(bool destroy_contents = false, 582 std::string *Err = 0) const; 583 584 585 /// MapInFilePages - This is a low level system API to map in the file 586 /// that is currently opened as FD into the current processes' address 587 /// space for read only access. This function may return null on failure 588 /// or if the system cannot provide the following constraints: 589 /// 1) The pages must be valid after the FD is closed, until 590 /// UnMapFilePages is called. 591 /// 2) Any padding after the end of the file must be zero filled, if 592 /// present. 593 /// 3) The pages must be contiguous. 594 /// 595 /// This API is not intended for general use, clients should use 596 /// MemoryBuffer::getFile instead. 597 static const char *MapInFilePages(int FD, size_t FileSize, 598 off_t Offset); 599 600 /// UnMapFilePages - Free pages mapped into the current process by 601 /// MapInFilePages. 602 /// 603 /// This API is not intended for general use, clients should use 604 /// MemoryBuffer::getFile instead. 605 static void UnMapFilePages(const char *Base, size_t FileSize); 606 607 /// @} 608 /// @name Data 609 /// @{ 610 protected: 611 // Our win32 implementation relies on this string being mutable. 612 mutable std::string path; ///< Storage for the path name. 613 614 615 /// @} 616 }; 617 618 /// This class is identical to Path class except it allows you to obtain the 619 /// file status of the Path as well. The reason for the distinction is one of 620 /// efficiency. First, the file status requires additional space and the space 621 /// is incorporated directly into PathWithStatus without an additional malloc. 622 /// Second, obtaining status information is an expensive operation on most 623 /// operating systems so we want to be careful and explicit about where we 624 /// allow this operation in LLVM. 625 /// @brief Path with file status class. 626 class PathWithStatus : public Path { 627 /// @name Constructors 628 /// @{ 629 public: 630 /// @brief Default constructor 631 PathWithStatus() : Path(), status(), fsIsValid(false) {} 632 633 /// @brief Copy constructor 634 PathWithStatus(const PathWithStatus &that) 635 : Path(static_cast<const Path&>(that)), status(that.status), 636 fsIsValid(that.fsIsValid) {} 637 638 /// This constructor allows construction from a Path object 639 /// @brief Path constructor 640 PathWithStatus(const Path &other) 641 : Path(other), status(), fsIsValid(false) {} 642 643 /// This constructor will accept a char* or std::string as a path. No 644 /// checking is done on this path to determine if it is valid. To 645 /// determine validity of the path, use the isValid method. 646 /// @brief Construct a Path from a string. 647 explicit PathWithStatus( 648 StringRef p ///< The path to assign. 649 ) : Path(p), status(), fsIsValid(false) {} 650 651 /// This constructor will accept a character range as a path. No checking 652 /// is done on this path to determine if it is valid. To determine 653 /// validity of the path, use the isValid method. 654 /// @brief Construct a Path from a string. 655 explicit PathWithStatus( 656 const char *StrStart, ///< Pointer to the first character of the path 657 unsigned StrLen ///< Length of the path. 658 ) : Path(StrStart, StrLen), status(), fsIsValid(false) {} 659 660 /// Makes a copy of \p that to \p this. 661 /// @returns \p this 662 /// @brief Assignment Operator 663 PathWithStatus &operator=(const PathWithStatus &that) { 664 static_cast<Path&>(*this) = static_cast<const Path&>(that); 665 status = that.status; 666 fsIsValid = that.fsIsValid; 667 return *this; 668 } 669 670 /// Makes a copy of \p that to \p this. 671 /// @returns \p this 672 /// @brief Assignment Operator 673 PathWithStatus &operator=(const Path &that) { 674 static_cast<Path&>(*this) = static_cast<const Path&>(that); 675 fsIsValid = false; 676 return *this; 677 } 678 679 /// @} 680 /// @name Methods 681 /// @{ 682 public: 683 /// This function returns status information about the file. The type of 684 /// path (file or directory) is updated to reflect the actual contents 685 /// of the file system. 686 /// @returns 0 on failure, with Error explaining why (if non-zero) 687 /// @returns a pointer to a FileStatus structure on success. 688 /// @brief Get file status. 689 const FileStatus *getFileStatus( 690 bool forceUpdate = false, ///< Force an update from the file system 691 std::string *Error = 0 ///< Optional place to return an error msg. 692 ) const; 693 694 /// @} 695 /// @name Data 696 /// @{ 697 private: 698 mutable FileStatus status; ///< Status information. 699 mutable bool fsIsValid; ///< Whether we've obtained it or not 700 701 /// @} 702 }; 703 704 /// This enumeration delineates the kinds of files that LLVM knows about. 705 enum LLVMFileType { 706 Unknown_FileType = 0, ///< Unrecognized file 707 Bitcode_FileType, ///< Bitcode file 708 Archive_FileType, ///< ar style archive file 709 ELF_Relocatable_FileType, ///< ELF Relocatable object file 710 ELF_Executable_FileType, ///< ELF Executable image 711 ELF_SharedObject_FileType, ///< ELF dynamically linked shared lib 712 ELF_Core_FileType, ///< ELF core image 713 Mach_O_Object_FileType, ///< Mach-O Object file 714 Mach_O_Executable_FileType, ///< Mach-O Executable 715 Mach_O_FixedVirtualMemorySharedLib_FileType, ///< Mach-O Shared Lib, FVM 716 Mach_O_Core_FileType, ///< Mach-O Core File 717 Mach_O_PreloadExecutable_FileType, ///< Mach-O Preloaded Executable 718 Mach_O_DynamicallyLinkedSharedLib_FileType, ///< Mach-O dynlinked shared lib 719 Mach_O_DynamicLinker_FileType, ///< The Mach-O dynamic linker 720 Mach_O_Bundle_FileType, ///< Mach-O Bundle file 721 Mach_O_DynamicallyLinkedSharedLibStub_FileType, ///< Mach-O Shared lib stub 722 Mach_O_DSYMCompanion_FileType, ///< Mach-O dSYM companion file 723 COFF_FileType ///< COFF object file or lib 724 }; 725 726 /// This utility function allows any memory block to be examined in order 727 /// to determine its file type. 728 LLVMFileType IdentifyFileType(const char*magic, unsigned length); 729 730 /// This function can be used to copy the file specified by Src to the 731 /// file specified by Dest. If an error occurs, Dest is removed. 732 /// @returns true if an error occurs, false otherwise 733 /// @brief Copy one file to another. 734 bool CopyFile(const Path& Dest, const Path& Src, std::string* ErrMsg); 735 736 /// This is the OS-specific path separator: a colon on Unix or a semicolon 737 /// on Windows. 738 extern const char PathSeparator; 739 } 740 741 } 742 743 #endif 744
