1 //===- llvm/Support/Windows/PathV2.inc - Windows Path Impl ------*- 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 implements the Windows specific implementation of the PathV2 API. 11 // 12 //===----------------------------------------------------------------------===// 13 14 //===----------------------------------------------------------------------===// 15 //=== WARNING: Implementation here must contain only generic Windows code that 16 //=== is guaranteed to work on *all* Windows variants. 17 //===----------------------------------------------------------------------===// 18 19 #include "Windows.h" 20 #include <fcntl.h> 21 #include <io.h> 22 #include <sys/stat.h> 23 #include <sys/types.h> 24 25 #undef max 26 27 // MinGW doesn't define this. 28 #ifndef _ERRNO_T_DEFINED 29 #define _ERRNO_T_DEFINED 30 typedef int errno_t; 31 #endif 32 33 using namespace llvm; 34 35 namespace { 36 typedef BOOLEAN (WINAPI *PtrCreateSymbolicLinkW)( 37 /*__in*/ LPCWSTR lpSymlinkFileName, 38 /*__in*/ LPCWSTR lpTargetFileName, 39 /*__in*/ DWORD dwFlags); 40 41 PtrCreateSymbolicLinkW create_symbolic_link_api = PtrCreateSymbolicLinkW( 42 ::GetProcAddress(::GetModuleHandleA("kernel32.dll"), 43 "CreateSymbolicLinkW")); 44 45 error_code UTF8ToUTF16(StringRef utf8, SmallVectorImpl<wchar_t> &utf16) { 46 int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, 47 utf8.begin(), utf8.size(), 48 utf16.begin(), 0); 49 50 if (len == 0) 51 return windows_error(::GetLastError()); 52 53 utf16.reserve(len + 1); 54 utf16.set_size(len); 55 56 len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, 57 utf8.begin(), utf8.size(), 58 utf16.begin(), utf16.size()); 59 60 if (len == 0) 61 return windows_error(::GetLastError()); 62 63 // Make utf16 null terminated. 64 utf16.push_back(0); 65 utf16.pop_back(); 66 67 return error_code::success(); 68 } 69 70 error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len, 71 SmallVectorImpl<char> &utf8) { 72 // Get length. 73 int len = ::WideCharToMultiByte(CP_UTF8, 0, 74 utf16, utf16_len, 75 utf8.begin(), 0, 76 NULL, NULL); 77 78 if (len == 0) 79 return windows_error(::GetLastError()); 80 81 utf8.reserve(len); 82 utf8.set_size(len); 83 84 // Now do the actual conversion. 85 len = ::WideCharToMultiByte(CP_UTF8, 0, 86 utf16, utf16_len, 87 utf8.data(), utf8.size(), 88 NULL, NULL); 89 90 if (len == 0) 91 return windows_error(::GetLastError()); 92 93 // Make utf8 null terminated. 94 utf8.push_back(0); 95 utf8.pop_back(); 96 97 return error_code::success(); 98 } 99 100 error_code TempDir(SmallVectorImpl<wchar_t> &result) { 101 retry_temp_dir: 102 DWORD len = ::GetTempPathW(result.capacity(), result.begin()); 103 104 if (len == 0) 105 return windows_error(::GetLastError()); 106 107 if (len > result.capacity()) { 108 result.reserve(len); 109 goto retry_temp_dir; 110 } 111 112 result.set_size(len); 113 return error_code::success(); 114 } 115 116 bool is_separator(const wchar_t value) { 117 switch (value) { 118 case L'\\': 119 case L'/': 120 return true; 121 default: 122 return false; 123 } 124 } 125 } 126 127 namespace llvm { 128 namespace sys { 129 namespace fs { 130 131 error_code current_path(SmallVectorImpl<char> &result) { 132 SmallVector<wchar_t, 128> cur_path; 133 cur_path.reserve(128); 134 retry_cur_dir: 135 DWORD len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data()); 136 137 // A zero return value indicates a failure other than insufficient space. 138 if (len == 0) 139 return windows_error(::GetLastError()); 140 141 // If there's insufficient space, the len returned is larger than the len 142 // given. 143 if (len > cur_path.capacity()) { 144 cur_path.reserve(len); 145 goto retry_cur_dir; 146 } 147 148 cur_path.set_size(len); 149 // cur_path now holds the current directory in utf-16. Convert to utf-8. 150 151 // Find out how much space we need. Sadly, this function doesn't return the 152 // size needed unless you tell it the result size is 0, which means you 153 // _always_ have to call it twice. 154 len = ::WideCharToMultiByte(CP_UTF8, 0, 155 cur_path.data(), cur_path.size(), 156 result.data(), 0, 157 NULL, NULL); 158 159 if (len == 0) 160 return make_error_code(windows_error(::GetLastError())); 161 162 result.reserve(len); 163 result.set_size(len); 164 // Now do the actual conversion. 165 len = ::WideCharToMultiByte(CP_UTF8, 0, 166 cur_path.data(), cur_path.size(), 167 result.data(), result.size(), 168 NULL, NULL); 169 if (len == 0) 170 return windows_error(::GetLastError()); 171 172 return error_code::success(); 173 } 174 175 error_code copy_file(const Twine &from, const Twine &to, copy_option copt) { 176 // Get arguments. 177 SmallString<128> from_storage; 178 SmallString<128> to_storage; 179 StringRef f = from.toStringRef(from_storage); 180 StringRef t = to.toStringRef(to_storage); 181 182 // Convert to utf-16. 183 SmallVector<wchar_t, 128> wide_from; 184 SmallVector<wchar_t, 128> wide_to; 185 if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec; 186 if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec; 187 188 // Copy the file. 189 BOOL res = ::CopyFileW(wide_from.begin(), wide_to.begin(), 190 copt != copy_option::overwrite_if_exists); 191 192 if (res == 0) 193 return windows_error(::GetLastError()); 194 195 return error_code::success(); 196 } 197 198 error_code create_directory(const Twine &path, bool &existed) { 199 SmallString<128> path_storage; 200 SmallVector<wchar_t, 128> path_utf16; 201 202 if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage), 203 path_utf16)) 204 return ec; 205 206 if (!::CreateDirectoryW(path_utf16.begin(), NULL)) { 207 error_code ec = windows_error(::GetLastError()); 208 if (ec == windows_error::already_exists) 209 existed = true; 210 else 211 return ec; 212 } else 213 existed = false; 214 215 return error_code::success(); 216 } 217 218 error_code create_hard_link(const Twine &to, const Twine &from) { 219 // Get arguments. 220 SmallString<128> from_storage; 221 SmallString<128> to_storage; 222 StringRef f = from.toStringRef(from_storage); 223 StringRef t = to.toStringRef(to_storage); 224 225 // Convert to utf-16. 226 SmallVector<wchar_t, 128> wide_from; 227 SmallVector<wchar_t, 128> wide_to; 228 if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec; 229 if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec; 230 231 if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL)) 232 return windows_error(::GetLastError()); 233 234 return error_code::success(); 235 } 236 237 error_code create_symlink(const Twine &to, const Twine &from) { 238 // Only do it if the function is available at runtime. 239 if (!create_symbolic_link_api) 240 return make_error_code(errc::function_not_supported); 241 242 // Get arguments. 243 SmallString<128> from_storage; 244 SmallString<128> to_storage; 245 StringRef f = from.toStringRef(from_storage); 246 StringRef t = to.toStringRef(to_storage); 247 248 // Convert to utf-16. 249 SmallVector<wchar_t, 128> wide_from; 250 SmallVector<wchar_t, 128> wide_to; 251 if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec; 252 if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec; 253 254 if (!create_symbolic_link_api(wide_from.begin(), wide_to.begin(), 0)) 255 return windows_error(::GetLastError()); 256 257 return error_code::success(); 258 } 259 260 error_code remove(const Twine &path, bool &existed) { 261 SmallString<128> path_storage; 262 SmallVector<wchar_t, 128> path_utf16; 263 264 file_status st; 265 if (error_code ec = status(path, st)) 266 return ec; 267 268 if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage), 269 path_utf16)) 270 return ec; 271 272 if (st.type() == file_type::directory_file) { 273 if (!::RemoveDirectoryW(c_str(path_utf16))) { 274 error_code ec = windows_error(::GetLastError()); 275 if (ec != windows_error::file_not_found) 276 return ec; 277 existed = false; 278 } else 279 existed = true; 280 } else { 281 if (!::DeleteFileW(c_str(path_utf16))) { 282 error_code ec = windows_error(::GetLastError()); 283 if (ec != windows_error::file_not_found) 284 return ec; 285 existed = false; 286 } else 287 existed = true; 288 } 289 290 return error_code::success(); 291 } 292 293 error_code rename(const Twine &from, const Twine &to) { 294 // Get arguments. 295 SmallString<128> from_storage; 296 SmallString<128> to_storage; 297 StringRef f = from.toStringRef(from_storage); 298 StringRef t = to.toStringRef(to_storage); 299 300 // Convert to utf-16. 301 SmallVector<wchar_t, 128> wide_from; 302 SmallVector<wchar_t, 128> wide_to; 303 if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec; 304 if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec; 305 306 error_code ec = error_code::success(); 307 for (int i = 0; i < 2000; i++) { 308 if (::MoveFileExW(wide_from.begin(), wide_to.begin(), 309 MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING)) 310 return error_code::success(); 311 ec = windows_error(::GetLastError()); 312 if (ec != windows_error::access_denied) 313 break; 314 // Retry MoveFile() at ACCESS_DENIED. 315 // System scanners (eg. indexer) might open the source file when 316 // It is written and closed. 317 ::Sleep(1); 318 } 319 320 return ec; 321 } 322 323 error_code resize_file(const Twine &path, uint64_t size) { 324 SmallString<128> path_storage; 325 SmallVector<wchar_t, 128> path_utf16; 326 327 if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage), 328 path_utf16)) 329 return ec; 330 331 int fd = ::_wopen(path_utf16.begin(), O_BINARY | _O_RDWR, S_IWRITE); 332 if (fd == -1) 333 return error_code(errno, generic_category()); 334 #ifdef HAVE__CHSIZE_S 335 errno_t error = ::_chsize_s(fd, size); 336 #else 337 errno_t error = ::_chsize(fd, size); 338 #endif 339 ::close(fd); 340 return error_code(error, generic_category()); 341 } 342 343 error_code exists(const Twine &path, bool &result) { 344 SmallString<128> path_storage; 345 SmallVector<wchar_t, 128> path_utf16; 346 347 if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage), 348 path_utf16)) 349 return ec; 350 351 DWORD attributes = ::GetFileAttributesW(path_utf16.begin()); 352 353 if (attributes == INVALID_FILE_ATTRIBUTES) { 354 // See if the file didn't actually exist. 355 error_code ec = make_error_code(windows_error(::GetLastError())); 356 if (ec != windows_error::file_not_found && 357 ec != windows_error::path_not_found) 358 return ec; 359 result = false; 360 } else 361 result = true; 362 return error_code::success(); 363 } 364 365 bool equivalent(file_status A, file_status B) { 366 assert(status_known(A) && status_known(B)); 367 return A.FileIndexHigh == B.FileIndexHigh && 368 A.FileIndexLow == B.FileIndexLow && 369 A.FileSizeHigh == B.FileSizeHigh && 370 A.FileSizeLow == B.FileSizeLow && 371 A.LastWriteTimeHigh == B.LastWriteTimeHigh && 372 A.LastWriteTimeLow == B.LastWriteTimeLow && 373 A.VolumeSerialNumber == B.VolumeSerialNumber; 374 } 375 376 error_code equivalent(const Twine &A, const Twine &B, bool &result) { 377 file_status fsA, fsB; 378 if (error_code ec = status(A, fsA)) return ec; 379 if (error_code ec = status(B, fsB)) return ec; 380 result = equivalent(fsA, fsB); 381 return error_code::success(); 382 } 383 384 error_code file_size(const Twine &path, uint64_t &result) { 385 SmallString<128> path_storage; 386 SmallVector<wchar_t, 128> path_utf16; 387 388 if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage), 389 path_utf16)) 390 return ec; 391 392 WIN32_FILE_ATTRIBUTE_DATA FileData; 393 if (!::GetFileAttributesExW(path_utf16.begin(), 394 ::GetFileExInfoStandard, 395 &FileData)) 396 return windows_error(::GetLastError()); 397 398 result = 399 (uint64_t(FileData.nFileSizeHigh) << (sizeof(FileData.nFileSizeLow) * 8)) 400 + FileData.nFileSizeLow; 401 402 return error_code::success(); 403 } 404 405 static bool isReservedName(StringRef path) { 406 // This list of reserved names comes from MSDN, at: 407 // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx 408 static const char *sReservedNames[] = { "nul", "con", "prn", "aux", 409 "com1", "com2", "com3", "com4", "com5", "com6", 410 "com7", "com8", "com9", "lpt1", "lpt2", "lpt3", 411 "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9" }; 412 413 // First, check to see if this is a device namespace, which always 414 // starts with \\.\, since device namespaces are not legal file paths. 415 if (path.startswith("\\\\.\\")) 416 return true; 417 418 // Then compare against the list of ancient reserved names 419 for (size_t i = 0; i < sizeof(sReservedNames) / sizeof(const char *); ++i) { 420 if (path.equals_lower(sReservedNames[i])) 421 return true; 422 } 423 424 // The path isn't what we consider reserved. 425 return false; 426 } 427 428 error_code status(const Twine &path, file_status &result) { 429 SmallString<128> path_storage; 430 SmallVector<wchar_t, 128> path_utf16; 431 432 StringRef path8 = path.toStringRef(path_storage); 433 if (isReservedName(path8)) { 434 result = file_status(file_type::character_file); 435 return error_code::success(); 436 } 437 438 if (error_code ec = UTF8ToUTF16(path8, path_utf16)) 439 return ec; 440 441 DWORD attr = ::GetFileAttributesW(path_utf16.begin()); 442 if (attr == INVALID_FILE_ATTRIBUTES) 443 goto handle_status_error; 444 445 // Handle reparse points. 446 if (attr & FILE_ATTRIBUTE_REPARSE_POINT) { 447 ScopedFileHandle h( 448 ::CreateFileW(path_utf16.begin(), 449 0, // Attributes only. 450 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE, 451 NULL, 452 OPEN_EXISTING, 453 FILE_FLAG_BACKUP_SEMANTICS, 454 0)); 455 if (!h) 456 goto handle_status_error; 457 } 458 459 if (attr & FILE_ATTRIBUTE_DIRECTORY) 460 result = file_status(file_type::directory_file); 461 else { 462 result = file_status(file_type::regular_file); 463 ScopedFileHandle h( 464 ::CreateFileW(path_utf16.begin(), 465 0, // Attributes only. 466 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE, 467 NULL, 468 OPEN_EXISTING, 469 FILE_FLAG_BACKUP_SEMANTICS, 470 0)); 471 if (!h) 472 goto handle_status_error; 473 BY_HANDLE_FILE_INFORMATION Info; 474 if (!::GetFileInformationByHandle(h, &Info)) 475 goto handle_status_error; 476 result.FileIndexHigh = Info.nFileIndexHigh; 477 result.FileIndexLow = Info.nFileIndexLow; 478 result.FileSizeHigh = Info.nFileSizeHigh; 479 result.FileSizeLow = Info.nFileSizeLow; 480 result.LastWriteTimeHigh = Info.ftLastWriteTime.dwHighDateTime; 481 result.LastWriteTimeLow = Info.ftLastWriteTime.dwLowDateTime; 482 result.VolumeSerialNumber = Info.dwVolumeSerialNumber; 483 } 484 485 return error_code::success(); 486 487 handle_status_error: 488 error_code ec = windows_error(::GetLastError()); 489 if (ec == windows_error::file_not_found || 490 ec == windows_error::path_not_found) 491 result = file_status(file_type::file_not_found); 492 else if (ec == windows_error::sharing_violation) 493 result = file_status(file_type::type_unknown); 494 else { 495 result = file_status(file_type::status_error); 496 return ec; 497 } 498 499 return error_code::success(); 500 } 501 502 503 // Modifies permissions on a file. 504 error_code permissions(const Twine &path, perms prms) { 505 #if 0 // verify code below before enabling: 506 // If the permissions bits are not trying to modify 507 // "write" permissions, there is nothing to do. 508 if (!(prms & (owner_write|group_write|others_write))) 509 return error_code::success(); 510 511 SmallString<128> path_storage; 512 SmallVector<wchar_t, 128> path_utf16; 513 514 if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage), 515 path_utf16)) 516 return ec; 517 518 DWORD attributes = ::GetFileAttributesW(path_utf16.begin()); 519 520 if (prms & add_perms) { 521 attributes &= ~FILE_ATTRIBUTE_READONLY; 522 } 523 else if (prms & remove_perms) { 524 attributes |= FILE_ATTRIBUTE_READONLY; 525 } 526 else { 527 assert(0 && "neither add_perms or remove_perms is set"); 528 } 529 530 if ( ! ::SetFileAttributesW(path_utf16.begin(), attributes)) 531 return windows_error(::GetLastError()); 532 #endif 533 return error_code::success(); 534 } 535 536 537 // FIXME: mode should be used here and default to user r/w only, 538 // it currently comes in as a UNIX mode. 539 error_code unique_file(const Twine &model, int &result_fd, 540 SmallVectorImpl<char> &result_path, 541 bool makeAbsolute, unsigned mode) { 542 // Use result_path as temp storage. 543 result_path.set_size(0); 544 StringRef m = model.toStringRef(result_path); 545 546 SmallVector<wchar_t, 128> model_utf16; 547 if (error_code ec = UTF8ToUTF16(m, model_utf16)) return ec; 548 549 if (makeAbsolute) { 550 // Make model absolute by prepending a temp directory if it's not already. 551 bool absolute = path::is_absolute(m); 552 553 if (!absolute) { 554 SmallVector<wchar_t, 64> temp_dir; 555 if (error_code ec = TempDir(temp_dir)) return ec; 556 // Handle c: by removing it. 557 if (model_utf16.size() > 2 && model_utf16[1] == L':') { 558 model_utf16.erase(model_utf16.begin(), model_utf16.begin() + 2); 559 } 560 model_utf16.insert(model_utf16.begin(), temp_dir.begin(), temp_dir.end()); 561 } 562 } 563 564 // Replace '%' with random chars. From here on, DO NOT modify model. It may be 565 // needed if the randomly chosen path already exists. 566 SmallVector<wchar_t, 128> random_path_utf16; 567 568 // Get a Crypto Provider for CryptGenRandom. 569 HCRYPTPROV HCPC; 570 if (!::CryptAcquireContextW(&HCPC, 571 NULL, 572 NULL, 573 PROV_RSA_FULL, 574 CRYPT_VERIFYCONTEXT)) 575 return windows_error(::GetLastError()); 576 ScopedCryptContext CryptoProvider(HCPC); 577 578 retry_random_path: 579 random_path_utf16.set_size(0); 580 for (SmallVectorImpl<wchar_t>::const_iterator i = model_utf16.begin(), 581 e = model_utf16.end(); 582 i != e; ++i) { 583 if (*i == L'%') { 584 BYTE val = 0; 585 if (!::CryptGenRandom(CryptoProvider, 1, &val)) 586 return windows_error(::GetLastError()); 587 random_path_utf16.push_back("0123456789abcdef"[val & 15]); 588 } 589 else 590 random_path_utf16.push_back(*i); 591 } 592 // Make random_path_utf16 null terminated. 593 random_path_utf16.push_back(0); 594 random_path_utf16.pop_back(); 595 596 // Make sure we don't fall into an infinite loop by constantly trying 597 // to create the parent path. 598 bool TriedToCreateParent = false; 599 600 // Try to create + open the path. 601 retry_create_file: 602 HANDLE TempFileHandle = ::CreateFileW(random_path_utf16.begin(), 603 GENERIC_READ | GENERIC_WRITE, 604 FILE_SHARE_READ, 605 NULL, 606 // Return ERROR_FILE_EXISTS if the file 607 // already exists. 608 CREATE_NEW, 609 FILE_ATTRIBUTE_TEMPORARY, 610 NULL); 611 if (TempFileHandle == INVALID_HANDLE_VALUE) { 612 // If the file existed, try again, otherwise, error. 613 error_code ec = windows_error(::GetLastError()); 614 if (ec == windows_error::file_exists) 615 goto retry_random_path; 616 // Check for non-existing parent directories. 617 if (ec == windows_error::path_not_found && !TriedToCreateParent) { 618 TriedToCreateParent = true; 619 620 // Create the directories using result_path as temp storage. 621 if (error_code ec = UTF16ToUTF8(random_path_utf16.begin(), 622 random_path_utf16.size(), result_path)) 623 return ec; 624 StringRef p(result_path.begin(), result_path.size()); 625 SmallString<64> dir_to_create; 626 for (path::const_iterator i = path::begin(p), 627 e = --path::end(p); i != e; ++i) { 628 path::append(dir_to_create, *i); 629 bool Exists; 630 if (error_code ec = exists(Twine(dir_to_create), Exists)) return ec; 631 if (!Exists) { 632 // If c: doesn't exist, bail. 633 if (i->endswith(":")) 634 return ec; 635 636 SmallVector<wchar_t, 64> dir_to_create_utf16; 637 if (error_code ec = UTF8ToUTF16(dir_to_create, dir_to_create_utf16)) 638 return ec; 639 640 // Create the directory. 641 if (!::CreateDirectoryW(dir_to_create_utf16.begin(), NULL)) 642 return windows_error(::GetLastError()); 643 } 644 } 645 goto retry_create_file; 646 } 647 return ec; 648 } 649 650 // Set result_path to the utf-8 representation of the path. 651 if (error_code ec = UTF16ToUTF8(random_path_utf16.begin(), 652 random_path_utf16.size(), result_path)) { 653 ::CloseHandle(TempFileHandle); 654 ::DeleteFileW(random_path_utf16.begin()); 655 return ec; 656 } 657 658 // Convert the Windows API file handle into a C-runtime handle. 659 int fd = ::_open_osfhandle(intptr_t(TempFileHandle), 0); 660 if (fd == -1) { 661 ::CloseHandle(TempFileHandle); 662 ::DeleteFileW(random_path_utf16.begin()); 663 // MSDN doesn't say anything about _open_osfhandle setting errno or 664 // GetLastError(), so just return invalid_handle. 665 return windows_error::invalid_handle; 666 } 667 668 result_fd = fd; 669 return error_code::success(); 670 } 671 672 error_code get_magic(const Twine &path, uint32_t len, 673 SmallVectorImpl<char> &result) { 674 SmallString<128> path_storage; 675 SmallVector<wchar_t, 128> path_utf16; 676 result.set_size(0); 677 678 // Convert path to UTF-16. 679 if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage), 680 path_utf16)) 681 return ec; 682 683 // Open file. 684 HANDLE file = ::CreateFileW(c_str(path_utf16), 685 GENERIC_READ, 686 FILE_SHARE_READ, 687 NULL, 688 OPEN_EXISTING, 689 FILE_ATTRIBUTE_READONLY, 690 NULL); 691 if (file == INVALID_HANDLE_VALUE) 692 return windows_error(::GetLastError()); 693 694 // Allocate buffer. 695 result.reserve(len); 696 697 // Get magic! 698 DWORD bytes_read = 0; 699 BOOL read_success = ::ReadFile(file, result.data(), len, &bytes_read, NULL); 700 error_code ec = windows_error(::GetLastError()); 701 ::CloseHandle(file); 702 if (!read_success || (bytes_read != len)) { 703 // Set result size to the number of bytes read if it's valid. 704 if (bytes_read <= len) 705 result.set_size(bytes_read); 706 // ERROR_HANDLE_EOF is mapped to errc::value_too_large. 707 return ec; 708 } 709 710 result.set_size(len); 711 return error_code::success(); 712 } 713 714 error_code mapped_file_region::init(int FD, bool CloseFD, uint64_t Offset) { 715 FileDescriptor = FD; 716 // Make sure that the requested size fits within SIZE_T. 717 if (Size > std::numeric_limits<SIZE_T>::max()) { 718 if (FileDescriptor) { 719 if (CloseFD) 720 _close(FileDescriptor); 721 } else 722 ::CloseHandle(FileHandle); 723 return make_error_code(errc::invalid_argument); 724 } 725 726 DWORD flprotect; 727 switch (Mode) { 728 case readonly: flprotect = PAGE_READONLY; break; 729 case readwrite: flprotect = PAGE_READWRITE; break; 730 case priv: flprotect = PAGE_WRITECOPY; break; 731 default: llvm_unreachable("invalid mapping mode"); 732 } 733 734 FileMappingHandle = ::CreateFileMapping(FileHandle, 735 0, 736 flprotect, 737 Size >> 32, 738 Size & 0xffffffff, 739 0); 740 if (FileMappingHandle == NULL) { 741 error_code ec = windows_error(GetLastError()); 742 if (FileDescriptor) { 743 if (CloseFD) 744 _close(FileDescriptor); 745 } else 746 ::CloseHandle(FileHandle); 747 return ec; 748 } 749 750 DWORD dwDesiredAccess; 751 switch (Mode) { 752 case readonly: dwDesiredAccess = FILE_MAP_READ; break; 753 case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break; 754 case priv: dwDesiredAccess = FILE_MAP_COPY; break; 755 default: llvm_unreachable("invalid mapping mode"); 756 } 757 Mapping = ::MapViewOfFile(FileMappingHandle, 758 dwDesiredAccess, 759 Offset >> 32, 760 Offset & 0xffffffff, 761 Size); 762 if (Mapping == NULL) { 763 error_code ec = windows_error(GetLastError()); 764 ::CloseHandle(FileMappingHandle); 765 if (FileDescriptor) { 766 if (CloseFD) 767 _close(FileDescriptor); 768 } else 769 ::CloseHandle(FileHandle); 770 return ec; 771 } 772 773 if (Size == 0) { 774 MEMORY_BASIC_INFORMATION mbi; 775 SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi)); 776 if (Result == 0) { 777 error_code ec = windows_error(GetLastError()); 778 ::UnmapViewOfFile(Mapping); 779 ::CloseHandle(FileMappingHandle); 780 if (FileDescriptor) { 781 if (CloseFD) 782 _close(FileDescriptor); 783 } else 784 ::CloseHandle(FileHandle); 785 return ec; 786 } 787 Size = mbi.RegionSize; 788 } 789 790 // Close all the handles except for the view. It will keep the other handles 791 // alive. 792 ::CloseHandle(FileMappingHandle); 793 if (FileDescriptor) { 794 if (CloseFD) 795 _close(FileDescriptor); // Also closes FileHandle. 796 } else 797 ::CloseHandle(FileHandle); 798 return error_code::success(); 799 } 800 801 mapped_file_region::mapped_file_region(const Twine &path, 802 mapmode mode, 803 uint64_t length, 804 uint64_t offset, 805 error_code &ec) 806 : Mode(mode) 807 , Size(length) 808 , Mapping() 809 , FileDescriptor() 810 , FileHandle(INVALID_HANDLE_VALUE) 811 , FileMappingHandle() { 812 SmallString<128> path_storage; 813 SmallVector<wchar_t, 128> path_utf16; 814 815 // Convert path to UTF-16. 816 if ((ec = UTF8ToUTF16(path.toStringRef(path_storage), path_utf16))) 817 return; 818 819 // Get file handle for creating a file mapping. 820 FileHandle = ::CreateFileW(c_str(path_utf16), 821 Mode == readonly ? GENERIC_READ 822 : GENERIC_READ | GENERIC_WRITE, 823 Mode == readonly ? FILE_SHARE_READ 824 : 0, 825 0, 826 Mode == readonly ? OPEN_EXISTING 827 : OPEN_ALWAYS, 828 Mode == readonly ? FILE_ATTRIBUTE_READONLY 829 : FILE_ATTRIBUTE_NORMAL, 830 0); 831 if (FileHandle == INVALID_HANDLE_VALUE) { 832 ec = windows_error(::GetLastError()); 833 return; 834 } 835 836 FileDescriptor = 0; 837 ec = init(FileDescriptor, true, offset); 838 if (ec) { 839 Mapping = FileMappingHandle = 0; 840 FileHandle = INVALID_HANDLE_VALUE; 841 FileDescriptor = 0; 842 } 843 } 844 845 mapped_file_region::mapped_file_region(int fd, 846 bool closefd, 847 mapmode mode, 848 uint64_t length, 849 uint64_t offset, 850 error_code &ec) 851 : Mode(mode) 852 , Size(length) 853 , Mapping() 854 , FileDescriptor(fd) 855 , FileHandle(INVALID_HANDLE_VALUE) 856 , FileMappingHandle() { 857 FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(fd)); 858 if (FileHandle == INVALID_HANDLE_VALUE) { 859 if (closefd) 860 _close(FileDescriptor); 861 FileDescriptor = 0; 862 ec = make_error_code(errc::bad_file_descriptor); 863 return; 864 } 865 866 ec = init(FileDescriptor, closefd, offset); 867 if (ec) { 868 Mapping = FileMappingHandle = 0; 869 FileHandle = INVALID_HANDLE_VALUE; 870 FileDescriptor = 0; 871 } 872 } 873 874 mapped_file_region::~mapped_file_region() { 875 if (Mapping) 876 ::UnmapViewOfFile(Mapping); 877 } 878 879 #if LLVM_HAS_RVALUE_REFERENCES 880 mapped_file_region::mapped_file_region(mapped_file_region &&other) 881 : Mode(other.Mode) 882 , Size(other.Size) 883 , Mapping(other.Mapping) 884 , FileDescriptor(other.FileDescriptor) 885 , FileHandle(other.FileHandle) 886 , FileMappingHandle(other.FileMappingHandle) { 887 other.Mapping = other.FileMappingHandle = 0; 888 other.FileHandle = INVALID_HANDLE_VALUE; 889 other.FileDescriptor = 0; 890 } 891 #endif 892 893 mapped_file_region::mapmode mapped_file_region::flags() const { 894 assert(Mapping && "Mapping failed but used anyway!"); 895 return Mode; 896 } 897 898 uint64_t mapped_file_region::size() const { 899 assert(Mapping && "Mapping failed but used anyway!"); 900 return Size; 901 } 902 903 char *mapped_file_region::data() const { 904 assert(Mode != readonly && "Cannot get non const data for readonly mapping!"); 905 assert(Mapping && "Mapping failed but used anyway!"); 906 return reinterpret_cast<char*>(Mapping); 907 } 908 909 const char *mapped_file_region::const_data() const { 910 assert(Mapping && "Mapping failed but used anyway!"); 911 return reinterpret_cast<const char*>(Mapping); 912 } 913 914 int mapped_file_region::alignment() { 915 SYSTEM_INFO SysInfo; 916 ::GetSystemInfo(&SysInfo); 917 return SysInfo.dwAllocationGranularity; 918 } 919 920 error_code detail::directory_iterator_construct(detail::DirIterState &it, 921 StringRef path){ 922 SmallVector<wchar_t, 128> path_utf16; 923 924 if (error_code ec = UTF8ToUTF16(path, 925 path_utf16)) 926 return ec; 927 928 // Convert path to the format that Windows is happy with. 929 if (path_utf16.size() > 0 && 930 !is_separator(path_utf16[path.size() - 1]) && 931 path_utf16[path.size() - 1] != L':') { 932 path_utf16.push_back(L'\\'); 933 path_utf16.push_back(L'*'); 934 } else { 935 path_utf16.push_back(L'*'); 936 } 937 938 // Get the first directory entry. 939 WIN32_FIND_DATAW FirstFind; 940 ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind)); 941 if (!FindHandle) 942 return windows_error(::GetLastError()); 943 944 size_t FilenameLen = ::wcslen(FirstFind.cFileName); 945 while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') || 946 (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' && 947 FirstFind.cFileName[1] == L'.')) 948 if (!::FindNextFileW(FindHandle, &FirstFind)) { 949 error_code ec = windows_error(::GetLastError()); 950 // Check for end. 951 if (ec == windows_error::no_more_files) 952 return detail::directory_iterator_destruct(it); 953 return ec; 954 } else 955 FilenameLen = ::wcslen(FirstFind.cFileName); 956 957 // Construct the current directory entry. 958 SmallString<128> directory_entry_name_utf8; 959 if (error_code ec = UTF16ToUTF8(FirstFind.cFileName, 960 ::wcslen(FirstFind.cFileName), 961 directory_entry_name_utf8)) 962 return ec; 963 964 it.IterationHandle = intptr_t(FindHandle.take()); 965 SmallString<128> directory_entry_path(path); 966 path::append(directory_entry_path, directory_entry_name_utf8.str()); 967 it.CurrentEntry = directory_entry(directory_entry_path.str()); 968 969 return error_code::success(); 970 } 971 972 error_code detail::directory_iterator_destruct(detail::DirIterState &it) { 973 if (it.IterationHandle != 0) 974 // Closes the handle if it's valid. 975 ScopedFindHandle close(HANDLE(it.IterationHandle)); 976 it.IterationHandle = 0; 977 it.CurrentEntry = directory_entry(); 978 return error_code::success(); 979 } 980 981 error_code detail::directory_iterator_increment(detail::DirIterState &it) { 982 WIN32_FIND_DATAW FindData; 983 if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) { 984 error_code ec = windows_error(::GetLastError()); 985 // Check for end. 986 if (ec == windows_error::no_more_files) 987 return detail::directory_iterator_destruct(it); 988 return ec; 989 } 990 991 size_t FilenameLen = ::wcslen(FindData.cFileName); 992 if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') || 993 (FilenameLen == 2 && FindData.cFileName[0] == L'.' && 994 FindData.cFileName[1] == L'.')) 995 return directory_iterator_increment(it); 996 997 SmallString<128> directory_entry_path_utf8; 998 if (error_code ec = UTF16ToUTF8(FindData.cFileName, 999 ::wcslen(FindData.cFileName), 1000 directory_entry_path_utf8)) 1001 return ec; 1002 1003 it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8)); 1004 return error_code::success(); 1005 } 1006 1007 error_code map_file_pages(const Twine &path, off_t file_offset, size_t size, 1008 bool map_writable, void *&result) { 1009 assert(0 && "NOT IMPLEMENTED"); 1010 return windows_error::invalid_function; 1011 } 1012 1013 error_code unmap_file_pages(void *base, size_t size) { 1014 assert(0 && "NOT IMPLEMENTED"); 1015 return windows_error::invalid_function; 1016 } 1017 1018 1019 1020 } // end namespace fs 1021 } // end namespace sys 1022 } // end namespace llvm 1023
