1 //===--- FileManager.cpp - File System Probing and Caching ----------------===// 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 implements the FileManager interface. 11 // 12 //===----------------------------------------------------------------------===// 13 // 14 // TODO: This should index all interesting directories with dirent calls. 15 // getdirentries ? 16 // opendir/readdir_r/closedir ? 17 // 18 //===----------------------------------------------------------------------===// 19 20 #include "clang/Basic/FileManager.h" 21 #include "clang/Basic/FileSystemStatCache.h" 22 #include "llvm/ADT/SmallString.h" 23 #include "llvm/Config/llvm-config.h" 24 #include "llvm/Support/FileSystem.h" 25 #include "llvm/Support/MemoryBuffer.h" 26 #include "llvm/Support/Path.h" 27 #include "llvm/Support/raw_ostream.h" 28 #include "llvm/Support/system_error.h" 29 #include <map> 30 #include <set> 31 #include <string> 32 33 // FIXME: This is terrible, we need this for ::close. 34 #if !defined(_MSC_VER) && !defined(__MINGW32__) 35 #include <unistd.h> 36 #include <sys/uio.h> 37 #else 38 #include <io.h> 39 #ifndef S_ISFIFO 40 #define S_ISFIFO(x) (0) 41 #endif 42 #endif 43 #if defined(LLVM_ON_UNIX) 44 #include <limits.h> 45 #endif 46 using namespace clang; 47 48 // FIXME: Enhance libsystem to support inode and other fields. 49 #include <sys/stat.h> 50 51 /// NON_EXISTENT_DIR - A special value distinct from null that is used to 52 /// represent a dir name that doesn't exist on the disk. 53 #define NON_EXISTENT_DIR reinterpret_cast<DirectoryEntry*>((intptr_t)-1) 54 55 /// NON_EXISTENT_FILE - A special value distinct from null that is used to 56 /// represent a filename that doesn't exist on the disk. 57 #define NON_EXISTENT_FILE reinterpret_cast<FileEntry*>((intptr_t)-1) 58 59 60 FileEntry::~FileEntry() { 61 // If this FileEntry owns an open file descriptor that never got used, close 62 // it. 63 if (FD != -1) ::close(FD); 64 } 65 66 bool FileEntry::isNamedPipe() const { 67 return S_ISFIFO(FileMode); 68 } 69 70 //===----------------------------------------------------------------------===// 71 // Windows. 72 //===----------------------------------------------------------------------===// 73 74 #ifdef LLVM_ON_WIN32 75 76 namespace { 77 static std::string GetFullPath(const char *relPath) { 78 char *absPathStrPtr = _fullpath(NULL, relPath, 0); 79 assert(absPathStrPtr && "_fullpath() returned NULL!"); 80 81 std::string absPath(absPathStrPtr); 82 83 free(absPathStrPtr); 84 return absPath; 85 } 86 } 87 88 class FileManager::UniqueDirContainer { 89 /// UniqueDirs - Cache from full path to existing directories/files. 90 /// 91 llvm::StringMap<DirectoryEntry> UniqueDirs; 92 93 public: 94 /// getDirectory - Return an existing DirectoryEntry with the given 95 /// name if there is already one; otherwise create and return a 96 /// default-constructed DirectoryEntry. 97 DirectoryEntry &getDirectory(const char *Name, 98 const struct stat & /*StatBuf*/) { 99 std::string FullPath(GetFullPath(Name)); 100 return UniqueDirs.GetOrCreateValue(FullPath).getValue(); 101 } 102 103 size_t size() const { return UniqueDirs.size(); } 104 }; 105 106 class FileManager::UniqueFileContainer { 107 /// UniqueFiles - Cache from full path to existing directories/files. 108 /// 109 llvm::StringMap<FileEntry, llvm::BumpPtrAllocator> UniqueFiles; 110 111 public: 112 /// getFile - Return an existing FileEntry with the given name if 113 /// there is already one; otherwise create and return a 114 /// default-constructed FileEntry. 115 FileEntry &getFile(const char *Name, const struct stat & /*StatBuf*/) { 116 std::string FullPath(GetFullPath(Name)); 117 118 // Lowercase string because Windows filesystem is case insensitive. 119 FullPath = StringRef(FullPath).lower(); 120 return UniqueFiles.GetOrCreateValue(FullPath).getValue(); 121 } 122 123 size_t size() const { return UniqueFiles.size(); } 124 125 void erase(const FileEntry *Entry) { 126 std::string FullPath(GetFullPath(Entry->getName())); 127 128 // Lowercase string because Windows filesystem is case insensitive. 129 FullPath = StringRef(FullPath).lower(); 130 UniqueFiles.erase(FullPath); 131 } 132 }; 133 134 //===----------------------------------------------------------------------===// 135 // Unix-like Systems. 136 //===----------------------------------------------------------------------===// 137 138 #else 139 140 class FileManager::UniqueDirContainer { 141 /// UniqueDirs - Cache from ID's to existing directories/files. 142 std::map<std::pair<dev_t, ino_t>, DirectoryEntry> UniqueDirs; 143 144 public: 145 /// getDirectory - Return an existing DirectoryEntry with the given 146 /// ID's if there is already one; otherwise create and return a 147 /// default-constructed DirectoryEntry. 148 DirectoryEntry &getDirectory(const char * /*Name*/, 149 const struct stat &StatBuf) { 150 return UniqueDirs[std::make_pair(StatBuf.st_dev, StatBuf.st_ino)]; 151 } 152 153 size_t size() const { return UniqueDirs.size(); } 154 }; 155 156 class FileManager::UniqueFileContainer { 157 /// UniqueFiles - Cache from ID's to existing directories/files. 158 std::set<FileEntry> UniqueFiles; 159 160 public: 161 /// getFile - Return an existing FileEntry with the given ID's if 162 /// there is already one; otherwise create and return a 163 /// default-constructed FileEntry. 164 FileEntry &getFile(const char * /*Name*/, const struct stat &StatBuf) { 165 return 166 const_cast<FileEntry&>( 167 *UniqueFiles.insert(FileEntry(StatBuf.st_dev, 168 StatBuf.st_ino, 169 StatBuf.st_mode)).first); 170 } 171 172 size_t size() const { return UniqueFiles.size(); } 173 174 void erase(const FileEntry *Entry) { UniqueFiles.erase(*Entry); } 175 }; 176 177 #endif 178 179 //===----------------------------------------------------------------------===// 180 // Common logic. 181 //===----------------------------------------------------------------------===// 182 183 FileManager::FileManager(const FileSystemOptions &FSO) 184 : FileSystemOpts(FSO), 185 UniqueRealDirs(*new UniqueDirContainer()), 186 UniqueRealFiles(*new UniqueFileContainer()), 187 SeenDirEntries(64), SeenFileEntries(64), NextFileUID(0) { 188 NumDirLookups = NumFileLookups = 0; 189 NumDirCacheMisses = NumFileCacheMisses = 0; 190 } 191 192 FileManager::~FileManager() { 193 delete &UniqueRealDirs; 194 delete &UniqueRealFiles; 195 for (unsigned i = 0, e = VirtualFileEntries.size(); i != e; ++i) 196 delete VirtualFileEntries[i]; 197 for (unsigned i = 0, e = VirtualDirectoryEntries.size(); i != e; ++i) 198 delete VirtualDirectoryEntries[i]; 199 } 200 201 void FileManager::addStatCache(FileSystemStatCache *statCache, 202 bool AtBeginning) { 203 assert(statCache && "No stat cache provided?"); 204 if (AtBeginning || StatCache.get() == 0) { 205 statCache->setNextStatCache(StatCache.take()); 206 StatCache.reset(statCache); 207 return; 208 } 209 210 FileSystemStatCache *LastCache = StatCache.get(); 211 while (LastCache->getNextStatCache()) 212 LastCache = LastCache->getNextStatCache(); 213 214 LastCache->setNextStatCache(statCache); 215 } 216 217 void FileManager::removeStatCache(FileSystemStatCache *statCache) { 218 if (!statCache) 219 return; 220 221 if (StatCache.get() == statCache) { 222 // This is the first stat cache. 223 StatCache.reset(StatCache->takeNextStatCache()); 224 return; 225 } 226 227 // Find the stat cache in the list. 228 FileSystemStatCache *PrevCache = StatCache.get(); 229 while (PrevCache && PrevCache->getNextStatCache() != statCache) 230 PrevCache = PrevCache->getNextStatCache(); 231 232 assert(PrevCache && "Stat cache not found for removal"); 233 PrevCache->setNextStatCache(statCache->getNextStatCache()); 234 } 235 236 void FileManager::clearStatCaches() { 237 StatCache.reset(0); 238 } 239 240 /// \brief Retrieve the directory that the given file name resides in. 241 /// Filename can point to either a real file or a virtual file. 242 static const DirectoryEntry *getDirectoryFromFile(FileManager &FileMgr, 243 StringRef Filename, 244 bool CacheFailure) { 245 if (Filename.empty()) 246 return NULL; 247 248 if (llvm::sys::path::is_separator(Filename[Filename.size() - 1])) 249 return NULL; // If Filename is a directory. 250 251 StringRef DirName = llvm::sys::path::parent_path(Filename); 252 // Use the current directory if file has no path component. 253 if (DirName.empty()) 254 DirName = "."; 255 256 return FileMgr.getDirectory(DirName, CacheFailure); 257 } 258 259 /// Add all ancestors of the given path (pointing to either a file or 260 /// a directory) as virtual directories. 261 void FileManager::addAncestorsAsVirtualDirs(StringRef Path) { 262 StringRef DirName = llvm::sys::path::parent_path(Path); 263 if (DirName.empty()) 264 return; 265 266 llvm::StringMapEntry<DirectoryEntry *> &NamedDirEnt = 267 SeenDirEntries.GetOrCreateValue(DirName); 268 269 // When caching a virtual directory, we always cache its ancestors 270 // at the same time. Therefore, if DirName is already in the cache, 271 // we don't need to recurse as its ancestors must also already be in 272 // the cache. 273 if (NamedDirEnt.getValue()) 274 return; 275 276 // Add the virtual directory to the cache. 277 DirectoryEntry *UDE = new DirectoryEntry; 278 UDE->Name = NamedDirEnt.getKeyData(); 279 NamedDirEnt.setValue(UDE); 280 VirtualDirectoryEntries.push_back(UDE); 281 282 // Recursively add the other ancestors. 283 addAncestorsAsVirtualDirs(DirName); 284 } 285 286 const DirectoryEntry *FileManager::getDirectory(StringRef DirName, 287 bool CacheFailure) { 288 // stat doesn't like trailing separators except for root directory. 289 // At least, on Win32 MSVCRT, stat() cannot strip trailing '/'. 290 // (though it can strip '\\') 291 if (DirName.size() > 1 && 292 DirName != llvm::sys::path::root_path(DirName) && 293 llvm::sys::path::is_separator(DirName.back())) 294 DirName = DirName.substr(0, DirName.size()-1); 295 296 ++NumDirLookups; 297 llvm::StringMapEntry<DirectoryEntry *> &NamedDirEnt = 298 SeenDirEntries.GetOrCreateValue(DirName); 299 300 // See if there was already an entry in the map. Note that the map 301 // contains both virtual and real directories. 302 if (NamedDirEnt.getValue()) 303 return NamedDirEnt.getValue() == NON_EXISTENT_DIR 304 ? 0 : NamedDirEnt.getValue(); 305 306 ++NumDirCacheMisses; 307 308 // By default, initialize it to invalid. 309 NamedDirEnt.setValue(NON_EXISTENT_DIR); 310 311 // Get the null-terminated directory name as stored as the key of the 312 // SeenDirEntries map. 313 const char *InterndDirName = NamedDirEnt.getKeyData(); 314 315 // Check to see if the directory exists. 316 struct stat StatBuf; 317 if (getStatValue(InterndDirName, StatBuf, false, 0/*directory lookup*/)) { 318 // There's no real directory at the given path. 319 if (!CacheFailure) 320 SeenDirEntries.erase(DirName); 321 return 0; 322 } 323 324 // It exists. See if we have already opened a directory with the 325 // same inode (this occurs on Unix-like systems when one dir is 326 // symlinked to another, for example) or the same path (on 327 // Windows). 328 DirectoryEntry &UDE = UniqueRealDirs.getDirectory(InterndDirName, StatBuf); 329 330 NamedDirEnt.setValue(&UDE); 331 if (!UDE.getName()) { 332 // We don't have this directory yet, add it. We use the string 333 // key from the SeenDirEntries map as the string. 334 UDE.Name = InterndDirName; 335 } 336 337 return &UDE; 338 } 339 340 const FileEntry *FileManager::getFile(StringRef Filename, bool openFile, 341 bool CacheFailure) { 342 ++NumFileLookups; 343 344 // See if there is already an entry in the map. 345 llvm::StringMapEntry<FileEntry *> &NamedFileEnt = 346 SeenFileEntries.GetOrCreateValue(Filename); 347 348 // See if there is already an entry in the map. 349 if (NamedFileEnt.getValue()) 350 return NamedFileEnt.getValue() == NON_EXISTENT_FILE 351 ? 0 : NamedFileEnt.getValue(); 352 353 ++NumFileCacheMisses; 354 355 // By default, initialize it to invalid. 356 NamedFileEnt.setValue(NON_EXISTENT_FILE); 357 358 // Get the null-terminated file name as stored as the key of the 359 // SeenFileEntries map. 360 const char *InterndFileName = NamedFileEnt.getKeyData(); 361 362 // Look up the directory for the file. When looking up something like 363 // sys/foo.h we'll discover all of the search directories that have a 'sys' 364 // subdirectory. This will let us avoid having to waste time on known-to-fail 365 // searches when we go to find sys/bar.h, because all the search directories 366 // without a 'sys' subdir will get a cached failure result. 367 const DirectoryEntry *DirInfo = getDirectoryFromFile(*this, Filename, 368 CacheFailure); 369 if (DirInfo == 0) { // Directory doesn't exist, file can't exist. 370 if (!CacheFailure) 371 SeenFileEntries.erase(Filename); 372 373 return 0; 374 } 375 376 // FIXME: Use the directory info to prune this, before doing the stat syscall. 377 // FIXME: This will reduce the # syscalls. 378 379 // Nope, there isn't. Check to see if the file exists. 380 int FileDescriptor = -1; 381 struct stat StatBuf; 382 if (getStatValue(InterndFileName, StatBuf, true, 383 openFile ? &FileDescriptor : 0)) { 384 // There's no real file at the given path. 385 if (!CacheFailure) 386 SeenFileEntries.erase(Filename); 387 388 return 0; 389 } 390 391 if (FileDescriptor != -1 && !openFile) { 392 close(FileDescriptor); 393 FileDescriptor = -1; 394 } 395 396 // It exists. See if we have already opened a file with the same inode. 397 // This occurs when one dir is symlinked to another, for example. 398 FileEntry &UFE = UniqueRealFiles.getFile(InterndFileName, StatBuf); 399 400 NamedFileEnt.setValue(&UFE); 401 if (UFE.getName()) { // Already have an entry with this inode, return it. 402 // If the stat process opened the file, close it to avoid a FD leak. 403 if (FileDescriptor != -1) 404 close(FileDescriptor); 405 406 return &UFE; 407 } 408 409 // Otherwise, we don't have this directory yet, add it. 410 // FIXME: Change the name to be a char* that points back to the 411 // 'SeenFileEntries' key. 412 UFE.Name = InterndFileName; 413 UFE.Size = StatBuf.st_size; 414 UFE.ModTime = StatBuf.st_mtime; 415 UFE.Dir = DirInfo; 416 UFE.UID = NextFileUID++; 417 UFE.FD = FileDescriptor; 418 return &UFE; 419 } 420 421 const FileEntry * 422 FileManager::getVirtualFile(StringRef Filename, off_t Size, 423 time_t ModificationTime) { 424 ++NumFileLookups; 425 426 // See if there is already an entry in the map. 427 llvm::StringMapEntry<FileEntry *> &NamedFileEnt = 428 SeenFileEntries.GetOrCreateValue(Filename); 429 430 // See if there is already an entry in the map. 431 if (NamedFileEnt.getValue() && NamedFileEnt.getValue() != NON_EXISTENT_FILE) 432 return NamedFileEnt.getValue(); 433 434 ++NumFileCacheMisses; 435 436 // By default, initialize it to invalid. 437 NamedFileEnt.setValue(NON_EXISTENT_FILE); 438 439 addAncestorsAsVirtualDirs(Filename); 440 FileEntry *UFE = 0; 441 442 // Now that all ancestors of Filename are in the cache, the 443 // following call is guaranteed to find the DirectoryEntry from the 444 // cache. 445 const DirectoryEntry *DirInfo = getDirectoryFromFile(*this, Filename, 446 /*CacheFailure=*/true); 447 assert(DirInfo && 448 "The directory of a virtual file should already be in the cache."); 449 450 // Check to see if the file exists. If so, drop the virtual file 451 struct stat StatBuf; 452 const char *InterndFileName = NamedFileEnt.getKeyData(); 453 if (getStatValue(InterndFileName, StatBuf, true, 0) == 0) { 454 StatBuf.st_size = Size; 455 StatBuf.st_mtime = ModificationTime; 456 UFE = &UniqueRealFiles.getFile(InterndFileName, StatBuf); 457 458 NamedFileEnt.setValue(UFE); 459 460 // If we had already opened this file, close it now so we don't 461 // leak the descriptor. We're not going to use the file 462 // descriptor anyway, since this is a virtual file. 463 if (UFE->FD != -1) { 464 close(UFE->FD); 465 UFE->FD = -1; 466 } 467 468 // If we already have an entry with this inode, return it. 469 if (UFE->getName()) 470 return UFE; 471 } 472 473 if (!UFE) { 474 UFE = new FileEntry(); 475 VirtualFileEntries.push_back(UFE); 476 NamedFileEnt.setValue(UFE); 477 } 478 479 UFE->Name = InterndFileName; 480 UFE->Size = Size; 481 UFE->ModTime = ModificationTime; 482 UFE->Dir = DirInfo; 483 UFE->UID = NextFileUID++; 484 UFE->FD = -1; 485 return UFE; 486 } 487 488 void FileManager::FixupRelativePath(SmallVectorImpl<char> &path) const { 489 StringRef pathRef(path.data(), path.size()); 490 491 if (FileSystemOpts.WorkingDir.empty() 492 || llvm::sys::path::is_absolute(pathRef)) 493 return; 494 495 SmallString<128> NewPath(FileSystemOpts.WorkingDir); 496 llvm::sys::path::append(NewPath, pathRef); 497 path = NewPath; 498 } 499 500 llvm::MemoryBuffer *FileManager:: 501 getBufferForFile(const FileEntry *Entry, std::string *ErrorStr, 502 bool isVolatile) { 503 OwningPtr<llvm::MemoryBuffer> Result; 504 llvm::error_code ec; 505 506 uint64_t FileSize = Entry->getSize(); 507 // If there's a high enough chance that the file have changed since we 508 // got its size, force a stat before opening it. 509 if (isVolatile) 510 FileSize = -1; 511 512 const char *Filename = Entry->getName(); 513 // If the file is already open, use the open file descriptor. 514 if (Entry->FD != -1) { 515 ec = llvm::MemoryBuffer::getOpenFile(Entry->FD, Filename, Result, FileSize); 516 if (ErrorStr) 517 *ErrorStr = ec.message(); 518 519 close(Entry->FD); 520 Entry->FD = -1; 521 return Result.take(); 522 } 523 524 // Otherwise, open the file. 525 526 if (FileSystemOpts.WorkingDir.empty()) { 527 ec = llvm::MemoryBuffer::getFile(Filename, Result, FileSize); 528 if (ec && ErrorStr) 529 *ErrorStr = ec.message(); 530 return Result.take(); 531 } 532 533 SmallString<128> FilePath(Entry->getName()); 534 FixupRelativePath(FilePath); 535 ec = llvm::MemoryBuffer::getFile(FilePath.str(), Result, FileSize); 536 if (ec && ErrorStr) 537 *ErrorStr = ec.message(); 538 return Result.take(); 539 } 540 541 llvm::MemoryBuffer *FileManager:: 542 getBufferForFile(StringRef Filename, std::string *ErrorStr) { 543 OwningPtr<llvm::MemoryBuffer> Result; 544 llvm::error_code ec; 545 if (FileSystemOpts.WorkingDir.empty()) { 546 ec = llvm::MemoryBuffer::getFile(Filename, Result); 547 if (ec && ErrorStr) 548 *ErrorStr = ec.message(); 549 return Result.take(); 550 } 551 552 SmallString<128> FilePath(Filename); 553 FixupRelativePath(FilePath); 554 ec = llvm::MemoryBuffer::getFile(FilePath.c_str(), Result); 555 if (ec && ErrorStr) 556 *ErrorStr = ec.message(); 557 return Result.take(); 558 } 559 560 /// getStatValue - Get the 'stat' information for the specified path, 561 /// using the cache to accelerate it if possible. This returns true 562 /// if the path points to a virtual file or does not exist, or returns 563 /// false if it's an existent real file. If FileDescriptor is NULL, 564 /// do directory look-up instead of file look-up. 565 bool FileManager::getStatValue(const char *Path, struct stat &StatBuf, 566 bool isFile, int *FileDescriptor) { 567 // FIXME: FileSystemOpts shouldn't be passed in here, all paths should be 568 // absolute! 569 if (FileSystemOpts.WorkingDir.empty()) 570 return FileSystemStatCache::get(Path, StatBuf, isFile, FileDescriptor, 571 StatCache.get()); 572 573 SmallString<128> FilePath(Path); 574 FixupRelativePath(FilePath); 575 576 return FileSystemStatCache::get(FilePath.c_str(), StatBuf, 577 isFile, FileDescriptor, StatCache.get()); 578 } 579 580 bool FileManager::getNoncachedStatValue(StringRef Path, 581 struct stat &StatBuf) { 582 SmallString<128> FilePath(Path); 583 FixupRelativePath(FilePath); 584 585 return ::stat(FilePath.c_str(), &StatBuf) != 0; 586 } 587 588 void FileManager::invalidateCache(const FileEntry *Entry) { 589 assert(Entry && "Cannot invalidate a NULL FileEntry"); 590 591 SeenFileEntries.erase(Entry->getName()); 592 593 // FileEntry invalidation should not block future optimizations in the file 594 // caches. Possible alternatives are cache truncation (invalidate last N) or 595 // invalidation of the whole cache. 596 UniqueRealFiles.erase(Entry); 597 } 598 599 600 void FileManager::GetUniqueIDMapping( 601 SmallVectorImpl<const FileEntry *> &UIDToFiles) const { 602 UIDToFiles.clear(); 603 UIDToFiles.resize(NextFileUID); 604 605 // Map file entries 606 for (llvm::StringMap<FileEntry*, llvm::BumpPtrAllocator>::const_iterator 607 FE = SeenFileEntries.begin(), FEEnd = SeenFileEntries.end(); 608 FE != FEEnd; ++FE) 609 if (FE->getValue() && FE->getValue() != NON_EXISTENT_FILE) 610 UIDToFiles[FE->getValue()->getUID()] = FE->getValue(); 611 612 // Map virtual file entries 613 for (SmallVector<FileEntry*, 4>::const_iterator 614 VFE = VirtualFileEntries.begin(), VFEEnd = VirtualFileEntries.end(); 615 VFE != VFEEnd; ++VFE) 616 if (*VFE && *VFE != NON_EXISTENT_FILE) 617 UIDToFiles[(*VFE)->getUID()] = *VFE; 618 } 619 620 void FileManager::modifyFileEntry(FileEntry *File, 621 off_t Size, time_t ModificationTime) { 622 File->Size = Size; 623 File->ModTime = ModificationTime; 624 } 625 626 StringRef FileManager::getCanonicalName(const DirectoryEntry *Dir) { 627 // FIXME: use llvm::sys::fs::canonical() when it gets implemented 628 #ifdef LLVM_ON_UNIX 629 llvm::DenseMap<const DirectoryEntry *, llvm::StringRef>::iterator Known 630 = CanonicalDirNames.find(Dir); 631 if (Known != CanonicalDirNames.end()) 632 return Known->second; 633 634 StringRef CanonicalName(Dir->getName()); 635 char CanonicalNameBuf[PATH_MAX]; 636 if (realpath(Dir->getName(), CanonicalNameBuf)) { 637 unsigned Len = strlen(CanonicalNameBuf); 638 char *Mem = static_cast<char *>(CanonicalNameStorage.Allocate(Len, 1)); 639 memcpy(Mem, CanonicalNameBuf, Len); 640 CanonicalName = StringRef(Mem, Len); 641 } 642 643 CanonicalDirNames.insert(std::make_pair(Dir, CanonicalName)); 644 return CanonicalName; 645 #else 646 return StringRef(Dir->getName()); 647 #endif 648 } 649 650 void FileManager::PrintStats() const { 651 llvm::errs() << "\n*** File Manager Stats:\n"; 652 llvm::errs() << UniqueRealFiles.size() << " real files found, " 653 << UniqueRealDirs.size() << " real dirs found.\n"; 654 llvm::errs() << VirtualFileEntries.size() << " virtual files found, " 655 << VirtualDirectoryEntries.size() << " virtual dirs found.\n"; 656 llvm::errs() << NumDirLookups << " dir lookups, " 657 << NumDirCacheMisses << " dir cache misses.\n"; 658 llvm::errs() << NumFileLookups << " file lookups, " 659 << NumFileCacheMisses << " file cache misses.\n"; 660 661 //llvm::errs() << PagesMapped << BytesOfPagesMapped << FSLookups; 662 } 663