LLVM  9.0.0svn
Path.inc
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1 //===- llvm/Support/Unix/Path.inc - Unix Path Implementation ----*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the Unix specific implementation of the Path API.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 //===----------------------------------------------------------------------===//
14 //=== WARNING: Implementation here must contain only generic UNIX code that
15 //=== is guaranteed to work on *all* UNIX variants.
16 //===----------------------------------------------------------------------===//
17 
18 #include "Unix.h"
19 #include <limits.h>
20 #include <stdio.h>
21 #if HAVE_SYS_STAT_H
22 #include <sys/stat.h>
23 #endif
24 #if HAVE_FCNTL_H
25 #include <fcntl.h>
26 #endif
27 #ifdef HAVE_UNISTD_H
28 #include <unistd.h>
29 #endif
30 #ifdef HAVE_SYS_MMAN_H
31 #include <sys/mman.h>
32 #endif
33 
34 #include <dirent.h>
35 #include <pwd.h>
36 
37 #ifdef __APPLE__
38 #include <mach-o/dyld.h>
39 #include <sys/attr.h>
40 #include <copyfile.h>
41 #elif defined(__DragonFly__)
42 #include <sys/mount.h>
43 #endif
44 
45 // Both stdio.h and cstdio are included via different paths and
46 // stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros
47 // either.
48 #undef ferror
49 #undef feof
50 
51 // For GNU Hurd
52 #if defined(__GNU__) && !defined(PATH_MAX)
53 # define PATH_MAX 4096
54 # define MAXPATHLEN 4096
55 #endif
56 
57 #include <sys/types.h>
58 #if !defined(__APPLE__) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && \
59  !defined(__linux__) && !defined(__FreeBSD_kernel__) && !defined(_AIX)
60 #include <sys/statvfs.h>
61 #define STATVFS statvfs
62 #define FSTATVFS fstatvfs
63 #define STATVFS_F_FRSIZE(vfs) vfs.f_frsize
64 #else
65 #if defined(__OpenBSD__) || defined(__FreeBSD__)
66 #include <sys/mount.h>
67 #include <sys/param.h>
68 #elif defined(__linux__)
69 #if defined(HAVE_LINUX_MAGIC_H)
70 #include <linux/magic.h>
71 #else
72 #if defined(HAVE_LINUX_NFS_FS_H)
73 #include <linux/nfs_fs.h>
74 #endif
75 #if defined(HAVE_LINUX_SMB_H)
76 #include <linux/smb.h>
77 #endif
78 #endif
79 #include <sys/vfs.h>
80 #elif defined(_AIX)
81 #include <sys/statfs.h>
82 
83 // <sys/vmount.h> depends on `uint` to be a typedef from <sys/types.h> to
84 // `uint_t`; however, <sys/types.h> does not always declare `uint`. We provide
85 // the typedef prior to including <sys/vmount.h> to work around this issue.
86 typedef uint_t uint;
87 #include <sys/vmount.h>
88 #else
89 #include <sys/mount.h>
90 #endif
91 #define STATVFS statfs
92 #define FSTATVFS fstatfs
93 #define STATVFS_F_FRSIZE(vfs) static_cast<uint64_t>(vfs.f_bsize)
94 #endif
95 
96 #if defined(__NetBSD__) || defined(__DragonFly__) || defined(__GNU__)
97 #define STATVFS_F_FLAG(vfs) (vfs).f_flag
98 #else
99 #define STATVFS_F_FLAG(vfs) (vfs).f_flags
100 #endif
101 
102 using namespace llvm;
103 
104 namespace llvm {
105 namespace sys {
106 namespace fs {
107 
108 const file_t kInvalidFile = -1;
109 
110 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
111  defined(__minix) || defined(__FreeBSD_kernel__) || defined(__linux__) || \
112  defined(__CYGWIN__) || defined(__DragonFly__) || defined(_AIX) || defined(__GNU__)
113 static int
114 test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
115 {
116  struct stat sb;
117  char fullpath[PATH_MAX];
118 
119  int chars = snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
120  // We cannot write PATH_MAX characters because the string will be terminated
121  // with a null character. Fail if truncation happened.
122  if (chars >= PATH_MAX)
123  return 1;
124  if (!realpath(fullpath, ret))
125  return 1;
126  if (stat(fullpath, &sb) != 0)
127  return 1;
128 
129  return 0;
130 }
131 
132 static char *
133 getprogpath(char ret[PATH_MAX], const char *bin)
134 {
135  /* First approach: absolute path. */
136  if (bin[0] == '/') {
137  if (test_dir(ret, "/", bin) == 0)
138  return ret;
139  return nullptr;
140  }
141 
142  /* Second approach: relative path. */
143  if (strchr(bin, '/')) {
144  char cwd[PATH_MAX];
145  if (!getcwd(cwd, PATH_MAX))
146  return nullptr;
147  if (test_dir(ret, cwd, bin) == 0)
148  return ret;
149  return nullptr;
150  }
151 
152  /* Third approach: $PATH */
153  char *pv;
154  if ((pv = getenv("PATH")) == nullptr)
155  return nullptr;
156  char *s = strdup(pv);
157  if (!s)
158  return nullptr;
159  char *state;
160  for (char *t = strtok_r(s, ":", &state); t != nullptr;
161  t = strtok_r(nullptr, ":", &state)) {
162  if (test_dir(ret, t, bin) == 0) {
163  free(s);
164  return ret;
165  }
166  }
167  free(s);
168  return nullptr;
169 }
170 #endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__
171 
172 /// GetMainExecutable - Return the path to the main executable, given the
173 /// value of argv[0] from program startup.
174 std::string getMainExecutable(const char *argv0, void *MainAddr) {
175 #if defined(__APPLE__)
176  // On OS X the executable path is saved to the stack by dyld. Reading it
177  // from there is much faster than calling dladdr, especially for large
178  // binaries with symbols.
179  char exe_path[MAXPATHLEN];
180  uint32_t size = sizeof(exe_path);
181  if (_NSGetExecutablePath(exe_path, &size) == 0) {
182  char link_path[MAXPATHLEN];
183  if (realpath(exe_path, link_path))
184  return link_path;
185  }
186 #elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
187  defined(__minix) || defined(__DragonFly__) || \
188  defined(__FreeBSD_kernel__) || defined(_AIX)
189  StringRef curproc("/proc/curproc/file");
190  char exe_path[PATH_MAX];
191  // /proc is not mounted by default under FreeBSD, but gives more accurate
192  // information than argv[0] when it is.
193  if (sys::fs::exists(curproc)) {
194  ssize_t len = readlink(curproc.str().c_str(), exe_path, sizeof(exe_path));
195  if (len > 0) {
196  // Null terminate the string for realpath. readlink never null
197  // terminates its output.
198  len = std::min(len, ssize_t(sizeof(exe_path) - 1));
199  exe_path[len] = '\0';
200  return exe_path;
201  }
202  }
203  // If we don't have procfs mounted, fall back to argv[0]
204  if (getprogpath(exe_path, argv0) != NULL)
205  return exe_path;
206 #elif defined(__linux__) || defined(__CYGWIN__)
207  char exe_path[MAXPATHLEN];
208  StringRef aPath("/proc/self/exe");
209  if (sys::fs::exists(aPath)) {
210  // /proc is not always mounted under Linux (chroot for example).
211  ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path));
212  if (len < 0)
213  return "";
214 
215  // Null terminate the string for realpath. readlink never null
216  // terminates its output.
217  len = std::min(len, ssize_t(sizeof(exe_path) - 1));
218  exe_path[len] = '\0';
219 
220  // On Linux, /proc/self/exe always looks through symlinks. However, on
221  // GNU/Hurd, /proc/self/exe is a symlink to the path that was used to start
222  // the program, and not the eventual binary file. Therefore, call realpath
223  // so this behaves the same on all platforms.
224 #if _POSIX_VERSION >= 200112 || defined(__GLIBC__)
225  char *real_path = realpath(exe_path, NULL);
226  std::string ret = std::string(real_path);
227  free(real_path);
228  return ret;
229 #else
230  char real_path[MAXPATHLEN];
231  realpath(exe_path, real_path);
232  return std::string(real_path);
233 #endif
234  } else {
235  // Fall back to the classical detection.
236  if (getprogpath(exe_path, argv0))
237  return exe_path;
238  }
239 #elif defined(HAVE_DLFCN_H) && defined(HAVE_DLADDR)
240  // Use dladdr to get executable path if available.
241  Dl_info DLInfo;
242  int err = dladdr(MainAddr, &DLInfo);
243  if (err == 0)
244  return "";
245 
246  // If the filename is a symlink, we need to resolve and return the location of
247  // the actual executable.
248  char link_path[MAXPATHLEN];
249  if (realpath(DLInfo.dli_fname, link_path))
250  return link_path;
251 #else
252 #error GetMainExecutable is not implemented on this host yet.
253 #endif
254  return "";
255 }
256 
257 TimePoint<> basic_file_status::getLastAccessedTime() const {
259 }
260 
261 TimePoint<> basic_file_status::getLastModificationTime() const {
263 }
264 
265 UniqueID file_status::getUniqueID() const {
266  return UniqueID(fs_st_dev, fs_st_ino);
267 }
268 
270  return fs_st_nlinks;
271 }
272 
273 ErrorOr<space_info> disk_space(const Twine &Path) {
274  struct STATVFS Vfs;
275  if (::STATVFS(const_cast<char *>(Path.str().c_str()), &Vfs))
276  return std::error_code(errno, std::generic_category());
277  auto FrSize = STATVFS_F_FRSIZE(Vfs);
278  space_info SpaceInfo;
279  SpaceInfo.capacity = static_cast<uint64_t>(Vfs.f_blocks) * FrSize;
280  SpaceInfo.free = static_cast<uint64_t>(Vfs.f_bfree) * FrSize;
281  SpaceInfo.available = static_cast<uint64_t>(Vfs.f_bavail) * FrSize;
282  return SpaceInfo;
283 }
284 
285 std::error_code current_path(SmallVectorImpl<char> &result) {
286  result.clear();
287 
288  const char *pwd = ::getenv("PWD");
289  llvm::sys::fs::file_status PWDStatus, DotStatus;
290  if (pwd && llvm::sys::path::is_absolute(pwd) &&
291  !llvm::sys::fs::status(pwd, PWDStatus) &&
292  !llvm::sys::fs::status(".", DotStatus) &&
293  PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
294  result.append(pwd, pwd + strlen(pwd));
295  return std::error_code();
296  }
297 
298 #ifdef MAXPATHLEN
299  result.reserve(MAXPATHLEN);
300 #else
301 // For GNU Hurd
302  result.reserve(1024);
303 #endif
304 
305  while (true) {
306  if (::getcwd(result.data(), result.capacity()) == nullptr) {
307  // See if there was a real error.
308  if (errno != ENOMEM)
309  return std::error_code(errno, std::generic_category());
310  // Otherwise there just wasn't enough space.
311  result.reserve(result.capacity() * 2);
312  } else
313  break;
314  }
315 
316  result.set_size(strlen(result.data()));
317  return std::error_code();
318 }
319 
320 std::error_code set_current_path(const Twine &path) {
321  SmallString<128> path_storage;
322  StringRef p = path.toNullTerminatedStringRef(path_storage);
323 
324  if (::chdir(p.begin()) == -1)
325  return std::error_code(errno, std::generic_category());
326 
327  return std::error_code();
328 }
329 
330 std::error_code create_directory(const Twine &path, bool IgnoreExisting,
331  perms Perms) {
332  SmallString<128> path_storage;
333  StringRef p = path.toNullTerminatedStringRef(path_storage);
334 
335  if (::mkdir(p.begin(), Perms) == -1) {
336  if (errno != EEXIST || !IgnoreExisting)
337  return std::error_code(errno, std::generic_category());
338  }
339 
340  return std::error_code();
341 }
342 
343 // Note that we are using symbolic link because hard links are not supported by
344 // all filesystems (SMB doesn't).
345 std::error_code create_link(const Twine &to, const Twine &from) {
346  // Get arguments.
347  SmallString<128> from_storage;
348  SmallString<128> to_storage;
349  StringRef f = from.toNullTerminatedStringRef(from_storage);
350  StringRef t = to.toNullTerminatedStringRef(to_storage);
351 
352  if (::symlink(t.begin(), f.begin()) == -1)
353  return std::error_code(errno, std::generic_category());
354 
355  return std::error_code();
356 }
357 
358 std::error_code create_hard_link(const Twine &to, const Twine &from) {
359  // Get arguments.
360  SmallString<128> from_storage;
361  SmallString<128> to_storage;
362  StringRef f = from.toNullTerminatedStringRef(from_storage);
363  StringRef t = to.toNullTerminatedStringRef(to_storage);
364 
365  if (::link(t.begin(), f.begin()) == -1)
366  return std::error_code(errno, std::generic_category());
367 
368  return std::error_code();
369 }
370 
371 std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
372  SmallString<128> path_storage;
373  StringRef p = path.toNullTerminatedStringRef(path_storage);
374 
375  struct stat buf;
376  if (lstat(p.begin(), &buf) != 0) {
377  if (errno != ENOENT || !IgnoreNonExisting)
378  return std::error_code(errno, std::generic_category());
379  return std::error_code();
380  }
381 
382  // Note: this check catches strange situations. In all cases, LLVM should
383  // only be involved in the creation and deletion of regular files. This
384  // check ensures that what we're trying to erase is a regular file. It
385  // effectively prevents LLVM from erasing things like /dev/null, any block
386  // special file, or other things that aren't "regular" files.
387  if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
389 
390  if (::remove(p.begin()) == -1) {
391  if (errno != ENOENT || !IgnoreNonExisting)
392  return std::error_code(errno, std::generic_category());
393  }
394 
395  return std::error_code();
396 }
397 
398 static bool is_local_impl(struct STATVFS &Vfs) {
399 #if defined(__linux__) || defined(__GNU__)
400 #ifndef NFS_SUPER_MAGIC
401 #define NFS_SUPER_MAGIC 0x6969
402 #endif
403 #ifndef SMB_SUPER_MAGIC
404 #define SMB_SUPER_MAGIC 0x517B
405 #endif
406 #ifndef CIFS_MAGIC_NUMBER
407 #define CIFS_MAGIC_NUMBER 0xFF534D42
408 #endif
409 #ifdef __GNU__
410  switch ((uint32_t)Vfs.__f_type) {
411 #else
412  switch ((uint32_t)Vfs.f_type) {
413 #endif
414  case NFS_SUPER_MAGIC:
415  case SMB_SUPER_MAGIC:
416  case CIFS_MAGIC_NUMBER:
417  return false;
418  default:
419  return true;
420  }
421 #elif defined(__CYGWIN__)
422  // Cygwin doesn't expose this information; would need to use Win32 API.
423  return false;
424 #elif defined(__Fuchsia__)
425  // Fuchsia doesn't yet support remote filesystem mounts.
426  return true;
427 #elif defined(__HAIKU__)
428  // Haiku doesn't expose this information.
429  return false;
430 #elif defined(__sun)
431  // statvfs::f_basetype contains a null-terminated FSType name of the mounted target
432  StringRef fstype(Vfs.f_basetype);
433  // NFS is the only non-local fstype??
434  return !fstype.equals("nfs");
435 #elif defined(_AIX)
436  // Call mntctl; try more than twice in case of timing issues with a concurrent
437  // mount.
438  int Ret;
439  size_t BufSize = 2048u;
440  std::unique_ptr<char[]> Buf;
441  int Tries = 3;
442  while (Tries--) {
443  Buf = llvm::make_unique<char[]>(BufSize);
444  Ret = mntctl(MCTL_QUERY, BufSize, Buf.get());
445  if (Ret != 0)
446  break;
447  BufSize = *reinterpret_cast<unsigned int *>(Buf.get());
448  Buf.reset();
449  }
450 
451  if (Ret == -1)
452  // There was an error; "remote" is the conservative answer.
453  return false;
454 
455  // Look for the correct vmount entry.
456  char *CurObjPtr = Buf.get();
457  while (Ret--) {
458  struct vmount *Vp = reinterpret_cast<struct vmount *>(CurObjPtr);
459  static_assert(sizeof(Vfs.f_fsid) == sizeof(Vp->vmt_fsid),
460  "fsid length mismatch");
461  if (memcmp(&Vfs.f_fsid, &Vp->vmt_fsid, sizeof Vfs.f_fsid) == 0)
462  return (Vp->vmt_flags & MNT_REMOTE) == 0;
463 
464  CurObjPtr += Vp->vmt_length;
465  }
466 
467  // vmount entry not found; "remote" is the conservative answer.
468  return false;
469 #else
470  return !!(STATVFS_F_FLAG(Vfs) & MNT_LOCAL);
471 #endif
472 }
473 
474 std::error_code is_local(const Twine &Path, bool &Result) {
475  struct STATVFS Vfs;
476  if (::STATVFS(const_cast<char *>(Path.str().c_str()), &Vfs))
477  return std::error_code(errno, std::generic_category());
478 
479  Result = is_local_impl(Vfs);
480  return std::error_code();
481 }
482 
483 std::error_code is_local(int FD, bool &Result) {
484  struct STATVFS Vfs;
485  if (::FSTATVFS(FD, &Vfs))
486  return std::error_code(errno, std::generic_category());
487 
488  Result = is_local_impl(Vfs);
489  return std::error_code();
490 }
491 
492 std::error_code rename(const Twine &from, const Twine &to) {
493  // Get arguments.
494  SmallString<128> from_storage;
495  SmallString<128> to_storage;
496  StringRef f = from.toNullTerminatedStringRef(from_storage);
497  StringRef t = to.toNullTerminatedStringRef(to_storage);
498 
499  if (::rename(f.begin(), t.begin()) == -1)
500  return std::error_code(errno, std::generic_category());
501 
502  return std::error_code();
503 }
504 
505 std::error_code resize_file(int FD, uint64_t Size) {
506 #if defined(HAVE_POSIX_FALLOCATE)
507  // If we have posix_fallocate use it. Unlike ftruncate it always allocates
508  // space, so we get an error if the disk is full.
509  if (int Err = ::posix_fallocate(FD, 0, Size)) {
510 #ifdef _AIX
511  constexpr int NotSupportedError = ENOTSUP;
512 #else
513  constexpr int NotSupportedError = EOPNOTSUPP;
514 #endif
515  if (Err != EINVAL && Err != NotSupportedError)
516  return std::error_code(Err, std::generic_category());
517  }
518 #endif
519  // Use ftruncate as a fallback. It may or may not allocate space. At least on
520  // OS X with HFS+ it does.
521  if (::ftruncate(FD, Size) == -1)
522  return std::error_code(errno, std::generic_category());
523 
524  return std::error_code();
525 }
526 
527 static int convertAccessMode(AccessMode Mode) {
528  switch (Mode) {
529  case AccessMode::Exist:
530  return F_OK;
531  case AccessMode::Write:
532  return W_OK;
533  case AccessMode::Execute:
534  return R_OK | X_OK; // scripts also need R_OK.
535  }
536  llvm_unreachable("invalid enum");
537 }
538 
539 std::error_code access(const Twine &Path, AccessMode Mode) {
540  SmallString<128> PathStorage;
541  StringRef P = Path.toNullTerminatedStringRef(PathStorage);
542 
543  if (::access(P.begin(), convertAccessMode(Mode)) == -1)
544  return std::error_code(errno, std::generic_category());
545 
546  if (Mode == AccessMode::Execute) {
547  // Don't say that directories are executable.
548  struct stat buf;
549  if (0 != stat(P.begin(), &buf))
551  if (!S_ISREG(buf.st_mode))
553  }
554 
555  return std::error_code();
556 }
557 
558 bool can_execute(const Twine &Path) {
559  return !access(Path, AccessMode::Execute);
560 }
561 
562 bool equivalent(file_status A, file_status B) {
563  assert(status_known(A) && status_known(B));
564  return A.fs_st_dev == B.fs_st_dev &&
565  A.fs_st_ino == B.fs_st_ino;
566 }
567 
568 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
569  file_status fsA, fsB;
570  if (std::error_code ec = status(A, fsA))
571  return ec;
572  if (std::error_code ec = status(B, fsB))
573  return ec;
574  result = equivalent(fsA, fsB);
575  return std::error_code();
576 }
577 
578 static void expandTildeExpr(SmallVectorImpl<char> &Path) {
579  StringRef PathStr(Path.begin(), Path.size());
580  if (PathStr.empty() || !PathStr.startswith("~"))
581  return;
582 
583  PathStr = PathStr.drop_front();
584  StringRef Expr =
585  PathStr.take_until([](char c) { return path::is_separator(c); });
586  StringRef Remainder = PathStr.substr(Expr.size() + 1);
587  SmallString<128> Storage;
588  if (Expr.empty()) {
589  // This is just ~/..., resolve it to the current user's home dir.
590  if (!path::home_directory(Storage)) {
591  // For some reason we couldn't get the home directory. Just exit.
592  return;
593  }
594 
595  // Overwrite the first character and insert the rest.
596  Path[0] = Storage[0];
597  Path.insert(Path.begin() + 1, Storage.begin() + 1, Storage.end());
598  return;
599  }
600 
601  // This is a string of the form ~username/, look up this user's entry in the
602  // password database.
603  struct passwd *Entry = nullptr;
604  std::string User = Expr.str();
605  Entry = ::getpwnam(User.c_str());
606 
607  if (!Entry) {
608  // Unable to look up the entry, just return back the original path.
609  return;
610  }
611 
612  Storage = Remainder;
613  Path.clear();
614  Path.append(Entry->pw_dir, Entry->pw_dir + strlen(Entry->pw_dir));
615  llvm::sys::path::append(Path, Storage);
616 }
617 
618 
619 void expand_tilde(const Twine &path, SmallVectorImpl<char> &dest) {
620  dest.clear();
621  if (path.isTriviallyEmpty())
622  return;
623 
624  path.toVector(dest);
625  expandTildeExpr(dest);
626 
627  return;
628 }
629 
630 static file_type typeForMode(mode_t Mode) {
631  if (S_ISDIR(Mode))
633  else if (S_ISREG(Mode))
635  else if (S_ISBLK(Mode))
636  return file_type::block_file;
637  else if (S_ISCHR(Mode))
639  else if (S_ISFIFO(Mode))
640  return file_type::fifo_file;
641  else if (S_ISSOCK(Mode))
642  return file_type::socket_file;
643  else if (S_ISLNK(Mode))
646 }
647 
648 static std::error_code fillStatus(int StatRet, const struct stat &Status,
649  file_status &Result) {
650  if (StatRet != 0) {
651  std::error_code EC(errno, std::generic_category());
653  Result = file_status(file_type::file_not_found);
654  else
655  Result = file_status(file_type::status_error);
656  return EC;
657  }
658 
659  uint32_t atime_nsec, mtime_nsec;
660 #if defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
661  atime_nsec = Status.st_atimespec.tv_nsec;
662  mtime_nsec = Status.st_mtimespec.tv_nsec;
663 #elif defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
664  atime_nsec = Status.st_atim.tv_nsec;
665  mtime_nsec = Status.st_mtim.tv_nsec;
666 #else
667  atime_nsec = mtime_nsec = 0;
668 #endif
669 
670  perms Perms = static_cast<perms>(Status.st_mode) & all_perms;
671  Result = file_status(typeForMode(Status.st_mode), Perms, Status.st_dev,
672  Status.st_nlink, Status.st_ino,
673  Status.st_atime, atime_nsec, Status.st_mtime, mtime_nsec,
674  Status.st_uid, Status.st_gid, Status.st_size);
675 
676  return std::error_code();
677 }
678 
679 std::error_code status(const Twine &Path, file_status &Result, bool Follow) {
680  SmallString<128> PathStorage;
681  StringRef P = Path.toNullTerminatedStringRef(PathStorage);
682 
683  struct stat Status;
684  int StatRet = (Follow ? ::stat : ::lstat)(P.begin(), &Status);
685  return fillStatus(StatRet, Status, Result);
686 }
687 
688 std::error_code status(int FD, file_status &Result) {
689  struct stat Status;
690  int StatRet = ::fstat(FD, &Status);
691  return fillStatus(StatRet, Status, Result);
692 }
693 
694 std::error_code setPermissions(const Twine &Path, perms Permissions) {
695  SmallString<128> PathStorage;
696  StringRef P = Path.toNullTerminatedStringRef(PathStorage);
697 
698  if (::chmod(P.begin(), Permissions))
699  return std::error_code(errno, std::generic_category());
700  return std::error_code();
701 }
702 
703 std::error_code setLastAccessAndModificationTime(int FD, TimePoint<> AccessTime,
704  TimePoint<> ModificationTime) {
705 #if defined(HAVE_FUTIMENS)
706  timespec Times[2];
707  Times[0] = sys::toTimeSpec(AccessTime);
708  Times[1] = sys::toTimeSpec(ModificationTime);
709  if (::futimens(FD, Times))
710  return std::error_code(errno, std::generic_category());
711  return std::error_code();
712 #elif defined(HAVE_FUTIMES)
713  timeval Times[2];
714  Times[0] = sys::toTimeVal(
715  std::chrono::time_point_cast<std::chrono::microseconds>(AccessTime));
716  Times[1] =
717  sys::toTimeVal(std::chrono::time_point_cast<std::chrono::microseconds>(
718  ModificationTime));
719  if (::futimes(FD, Times))
720  return std::error_code(errno, std::generic_category());
721  return std::error_code();
722 #else
723 #warning Missing futimes() and futimens()
725 #endif
726 }
727 
728 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
729  mapmode Mode) {
730  assert(Size != 0);
731 
732  int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
733  int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
734 #if defined(__APPLE__)
735  //----------------------------------------------------------------------
736  // Newer versions of MacOSX have a flag that will allow us to read from
737  // binaries whose code signature is invalid without crashing by using
738  // the MAP_RESILIENT_CODESIGN flag. Also if a file from removable media
739  // is mapped we can avoid crashing and return zeroes to any pages we try
740  // to read if the media becomes unavailable by using the
741  // MAP_RESILIENT_MEDIA flag. These flags are only usable when mapping
742  // with PROT_READ, so take care not to specify them otherwise.
743  //----------------------------------------------------------------------
744  if (Mode == readonly) {
745 #if defined(MAP_RESILIENT_CODESIGN)
746  flags |= MAP_RESILIENT_CODESIGN;
747 #endif
748 #if defined(MAP_RESILIENT_MEDIA)
749  flags |= MAP_RESILIENT_MEDIA;
750 #endif
751  }
752 #endif // #if defined (__APPLE__)
753 
754  Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
755  if (Mapping == MAP_FAILED)
756  return std::error_code(errno, std::generic_category());
757  return std::error_code();
758 }
759 
760 mapped_file_region::mapped_file_region(int fd, mapmode mode, size_t length,
761  uint64_t offset, std::error_code &ec)
762  : Size(length), Mapping(), Mode(mode) {
763  (void)Mode;
764  ec = init(fd, offset, mode);
765  if (ec)
766  Mapping = nullptr;
767 }
768 
769 mapped_file_region::~mapped_file_region() {
770  if (Mapping)
771  ::munmap(Mapping, Size);
772 }
773 
774 size_t mapped_file_region::size() const {
775  assert(Mapping && "Mapping failed but used anyway!");
776  return Size;
777 }
778 
779 char *mapped_file_region::data() const {
780  assert(Mapping && "Mapping failed but used anyway!");
781  return reinterpret_cast<char*>(Mapping);
782 }
783 
784 const char *mapped_file_region::const_data() const {
785  assert(Mapping && "Mapping failed but used anyway!");
786  return reinterpret_cast<const char*>(Mapping);
787 }
788 
789 int mapped_file_region::alignment() {
791 }
792 
793 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
794  StringRef path,
795  bool follow_symlinks) {
796  SmallString<128> path_null(path);
797  DIR *directory = ::opendir(path_null.c_str());
798  if (!directory)
799  return std::error_code(errno, std::generic_category());
800 
801  it.IterationHandle = reinterpret_cast<intptr_t>(directory);
802  // Add something for replace_filename to replace.
803  path::append(path_null, ".");
804  it.CurrentEntry = directory_entry(path_null.str(), follow_symlinks);
805  return directory_iterator_increment(it);
806 }
807 
808 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
809  if (it.IterationHandle)
810  ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
811  it.IterationHandle = 0;
812  it.CurrentEntry = directory_entry();
813  return std::error_code();
814 }
815 
816 static file_type direntType(dirent* Entry) {
817  // Most platforms provide the file type in the dirent: Linux/BSD/Mac.
818  // The DTTOIF macro lets us reuse our status -> type conversion.
819 #if defined(_DIRENT_HAVE_D_TYPE) && defined(DTTOIF)
820  return typeForMode(DTTOIF(Entry->d_type));
821 #else
822  // Other platforms such as Solaris require a stat() to get the type.
823  return file_type::type_unknown;
824 #endif
825 }
826 
827 std::error_code detail::directory_iterator_increment(detail::DirIterState &It) {
828  errno = 0;
829  dirent *CurDir = ::readdir(reinterpret_cast<DIR *>(It.IterationHandle));
830  if (CurDir == nullptr && errno != 0) {
831  return std::error_code(errno, std::generic_category());
832  } else if (CurDir != nullptr) {
833  StringRef Name(CurDir->d_name);
834  if ((Name.size() == 1 && Name[0] == '.') ||
835  (Name.size() == 2 && Name[0] == '.' && Name[1] == '.'))
836  return directory_iterator_increment(It);
837  It.CurrentEntry.replace_filename(Name, direntType(CurDir));
838  } else
839  return directory_iterator_destruct(It);
840 
841  return std::error_code();
842 }
843 
845  file_status s;
846  if (auto EC = fs::status(Path, s, FollowSymlinks))
847  return EC;
848  return s;
849 }
850 
851 #if !defined(F_GETPATH)
852 static bool hasProcSelfFD() {
853  // If we have a /proc filesystem mounted, we can quickly establish the
854  // real name of the file with readlink
855  static const bool Result = (::access("/proc/self/fd", R_OK) == 0);
856  return Result;
857 }
858 #endif
859 
860 static int nativeOpenFlags(CreationDisposition Disp, OpenFlags Flags,
861  FileAccess Access) {
862  int Result = 0;
863  if (Access == FA_Read)
864  Result |= O_RDONLY;
865  else if (Access == FA_Write)
866  Result |= O_WRONLY;
867  else if (Access == (FA_Read | FA_Write))
868  Result |= O_RDWR;
869 
870  // This is for compatibility with old code that assumed F_Append implied
871  // would open an existing file. See Windows/Path.inc for a longer comment.
872  if (Flags & F_Append)
873  Disp = CD_OpenAlways;
874 
875  if (Disp == CD_CreateNew) {
876  Result |= O_CREAT; // Create if it doesn't exist.
877  Result |= O_EXCL; // Fail if it does.
878  } else if (Disp == CD_CreateAlways) {
879  Result |= O_CREAT; // Create if it doesn't exist.
880  Result |= O_TRUNC; // Truncate if it does.
881  } else if (Disp == CD_OpenAlways) {
882  Result |= O_CREAT; // Create if it doesn't exist.
883  } else if (Disp == CD_OpenExisting) {
884  // Nothing special, just don't add O_CREAT and we get these semantics.
885  }
886 
887  if (Flags & F_Append)
888  Result |= O_APPEND;
889 
890 #ifdef O_CLOEXEC
891  if (!(Flags & OF_ChildInherit))
892  Result |= O_CLOEXEC;
893 #endif
894 
895  return Result;
896 }
897 
898 std::error_code openFile(const Twine &Name, int &ResultFD,
899  CreationDisposition Disp, FileAccess Access,
900  OpenFlags Flags, unsigned Mode) {
901  int OpenFlags = nativeOpenFlags(Disp, Flags, Access);
902 
903  SmallString<128> Storage;
904  StringRef P = Name.toNullTerminatedStringRef(Storage);
905  // Call ::open in a lambda to avoid overload resolution in RetryAfterSignal
906  // when open is overloaded, such as in Bionic.
907  auto Open = [&]() { return ::open(P.begin(), OpenFlags, Mode); };
908  if ((ResultFD = sys::RetryAfterSignal(-1, Open)) < 0)
909  return std::error_code(errno, std::generic_category());
910 #ifndef O_CLOEXEC
911  if (!(Flags & OF_ChildInherit)) {
912  int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
913  (void)r;
914  assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
915  }
916 #endif
917  return std::error_code();
918 }
919 
921  FileAccess Access, OpenFlags Flags,
922  unsigned Mode) {
923 
924  int FD;
925  std::error_code EC = openFile(Name, FD, Disp, Access, Flags, Mode);
926  if (EC)
927  return errorCodeToError(EC);
928  return FD;
929 }
930 
931 std::error_code openFileForRead(const Twine &Name, int &ResultFD,
932  OpenFlags Flags,
933  SmallVectorImpl<char> *RealPath) {
934  std::error_code EC =
935  openFile(Name, ResultFD, CD_OpenExisting, FA_Read, Flags, 0666);
936  if (EC)
937  return EC;
938 
939  // Attempt to get the real name of the file, if the user asked
940  if(!RealPath)
941  return std::error_code();
942  RealPath->clear();
943 #if defined(F_GETPATH)
944  // When F_GETPATH is availble, it is the quickest way to get
945  // the real path name.
946  char Buffer[MAXPATHLEN];
947  if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1)
948  RealPath->append(Buffer, Buffer + strlen(Buffer));
949 #else
950  char Buffer[PATH_MAX];
951  if (hasProcSelfFD()) {
952  char ProcPath[64];
953  snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", ResultFD);
954  ssize_t CharCount = ::readlink(ProcPath, Buffer, sizeof(Buffer));
955  if (CharCount > 0)
956  RealPath->append(Buffer, Buffer + CharCount);
957  } else {
958  SmallString<128> Storage;
959  StringRef P = Name.toNullTerminatedStringRef(Storage);
960 
961  // Use ::realpath to get the real path name
962  if (::realpath(P.begin(), Buffer) != nullptr)
963  RealPath->append(Buffer, Buffer + strlen(Buffer));
964  }
965 #endif
966  return std::error_code();
967 }
968 
969 Expected<file_t> openNativeFileForRead(const Twine &Name, OpenFlags Flags,
970  SmallVectorImpl<char> *RealPath) {
971  file_t ResultFD;
972  std::error_code EC = openFileForRead(Name, ResultFD, Flags, RealPath);
973  if (EC)
974  return errorCodeToError(EC);
975  return ResultFD;
976 }
977 
978 void closeFile(file_t &F) {
979  ::close(F);
980  F = kInvalidFile;
981 }
982 
983 template <typename T>
984 static std::error_code remove_directories_impl(const T &Entry,
985  bool IgnoreErrors) {
986  std::error_code EC;
987  directory_iterator Begin(Entry, EC, false);
988  directory_iterator End;
989  while (Begin != End) {
990  auto &Item = *Begin;
991  ErrorOr<basic_file_status> st = Item.status();
992  if (!st && !IgnoreErrors)
993  return st.getError();
994 
995  if (is_directory(*st)) {
996  EC = remove_directories_impl(Item, IgnoreErrors);
997  if (EC && !IgnoreErrors)
998  return EC;
999  }
1000 
1001  EC = fs::remove(Item.path(), true);
1002  if (EC && !IgnoreErrors)
1003  return EC;
1004 
1005  Begin.increment(EC);
1006  if (EC && !IgnoreErrors)
1007  return EC;
1008  }
1009  return std::error_code();
1010 }
1011 
1012 std::error_code remove_directories(const Twine &path, bool IgnoreErrors) {
1013  auto EC = remove_directories_impl(path, IgnoreErrors);
1014  if (EC && !IgnoreErrors)
1015  return EC;
1016  EC = fs::remove(path, true);
1017  if (EC && !IgnoreErrors)
1018  return EC;
1019  return std::error_code();
1020 }
1021 
1022 std::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest,
1023  bool expand_tilde) {
1024  dest.clear();
1025  if (path.isTriviallyEmpty())
1026  return std::error_code();
1027 
1028  if (expand_tilde) {
1029  SmallString<128> Storage;
1030  path.toVector(Storage);
1031  expandTildeExpr(Storage);
1032  return real_path(Storage, dest, false);
1033  }
1034 
1035  SmallString<128> Storage;
1036  StringRef P = path.toNullTerminatedStringRef(Storage);
1037  char Buffer[PATH_MAX];
1038  if (::realpath(P.begin(), Buffer) == nullptr)
1039  return std::error_code(errno, std::generic_category());
1040  dest.append(Buffer, Buffer + strlen(Buffer));
1041  return std::error_code();
1042 }
1043 
1044 } // end namespace fs
1045 
1046 namespace path {
1047 
1048 bool home_directory(SmallVectorImpl<char> &result) {
1049  char *RequestedDir = getenv("HOME");
1050  if (!RequestedDir) {
1051  struct passwd *pw = getpwuid(getuid());
1052  if (pw && pw->pw_dir)
1053  RequestedDir = pw->pw_dir;
1054  }
1055  if (!RequestedDir)
1056  return false;
1057 
1058  result.clear();
1059  result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
1060  return true;
1061 }
1062 
1063 static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) {
1064  #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
1065  // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
1066  // macros defined in <unistd.h> on darwin >= 9
1067  int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR
1068  : _CS_DARWIN_USER_CACHE_DIR;
1069  size_t ConfLen = confstr(ConfName, nullptr, 0);
1070  if (ConfLen > 0) {
1071  do {
1072  Result.resize(ConfLen);
1073  ConfLen = confstr(ConfName, Result.data(), Result.size());
1074  } while (ConfLen > 0 && ConfLen != Result.size());
1075 
1076  if (ConfLen > 0) {
1077  assert(Result.back() == 0);
1078  Result.pop_back();
1079  return true;
1080  }
1081 
1082  Result.clear();
1083  }
1084  #endif
1085  return false;
1086 }
1087 
1088 static const char *getEnvTempDir() {
1089  // Check whether the temporary directory is specified by an environment
1090  // variable.
1091  const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
1092  for (const char *Env : EnvironmentVariables) {
1093  if (const char *Dir = std::getenv(Env))
1094  return Dir;
1095  }
1096 
1097  return nullptr;
1098 }
1099 
1100 static const char *getDefaultTempDir(bool ErasedOnReboot) {
1101 #ifdef P_tmpdir
1102  if ((bool)P_tmpdir)
1103  return P_tmpdir;
1104 #endif
1105 
1106  if (ErasedOnReboot)
1107  return "/tmp";
1108  return "/var/tmp";
1109 }
1110 
1111 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
1112  Result.clear();
1113 
1114  if (ErasedOnReboot) {
1115  // There is no env variable for the cache directory.
1116  if (const char *RequestedDir = getEnvTempDir()) {
1117  Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
1118  return;
1119  }
1120  }
1121 
1122  if (getDarwinConfDir(ErasedOnReboot, Result))
1123  return;
1124 
1125  const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
1126  Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
1127 }
1128 
1129 } // end namespace path
1130 
1131 namespace fs {
1132 
1133 #ifdef __APPLE__
1134 /// This implementation tries to perform an APFS CoW clone of the file,
1135 /// which can be much faster and uses less space.
1136 /// Unfortunately fcopyfile(3) does not support COPYFILE_CLONE, so the
1137 /// file descriptor variant of this function still uses the default
1138 /// implementation.
1139 std::error_code copy_file(const Twine &From, const Twine &To) {
1140  uint32_t Flag = COPYFILE_DATA;
1141 #if __has_builtin(__builtin_available)
1142  if (__builtin_available(macos 10.12, *)) {
1143  bool IsSymlink;
1144  if (std::error_code Error = is_symlink_file(From, IsSymlink))
1145  return Error;
1146  // COPYFILE_CLONE clones the symlink instead of following it
1147  // and returns EEXISTS if the target file already exists.
1148  if (!IsSymlink && !exists(To))
1149  Flag = COPYFILE_CLONE;
1150  }
1151 #endif
1152  int Status =
1153  copyfile(From.str().c_str(), To.str().c_str(), /* State */ NULL, Flag);
1154 
1155  if (Status == 0)
1156  return std::error_code();
1157  return std::error_code(errno, std::generic_category());
1158 }
1159 #endif // __APPLE__
1160 
1161 } // end namespace fs
1162 
1163 } // end namespace sys
1164 } // end namespace llvm
const file_t kInvalidFile
bool is_separator(char value, Style style=Style::native)
Check whether the given char is a path separator on the host OS.
Definition: Path.cpp:593
bool can_execute(const Twine &Path)
Can we execute this file?
Represents either an error or a value T.
Definition: ErrorOr.h:56
LLVM_NODISCARD std::string str() const
str - Get the contents as an std::string.
Definition: StringRef.h:218
SI Whole Quad Mode
bool status_known(const basic_file_status &s)
Is status available?
Definition: Path.cpp:1029
This class represents lattice values for constants.
Definition: AllocatorList.h:23
std::error_code openFileForRead(const Twine &Name, int &ResultFD, OpenFlags Flags=OF_None, SmallVectorImpl< char > *RealPath=nullptr)
Opens the file with the given name in a read-only mode, returning its open file descriptor.
void closeFile(file_t &F)
Close the file object.
LLVM_NODISCARD StringRef take_until(function_ref< bool(char)> F) const
Return the longest prefix of &#39;this&#39; such that no character in the prefix satisfies the given predicat...
Definition: StringRef.h:613
amdgpu Simplify well known AMD library false FunctionCallee Value const Twine & Name
std::error_code remove(const Twine &path, bool IgnoreNonExisting=true)
Remove path.
bool isTriviallyEmpty() const
Check if this twine is trivially empty; a false return value does not necessarily mean the twine is e...
Definition: Twine.h:400
std::error_code setLastAccessAndModificationTime(int FD, TimePoint<> AccessTime, TimePoint<> ModificationTime)
Set the file modification and access time.
std::error_code current_path(SmallVectorImpl< char > &result)
Get the current path.
bool is_directory(const basic_file_status &status)
Does status represent a directory?
Definition: Path.cpp:1040
Expected< file_t > openNativeFile(const Twine &Name, CreationDisposition Disp, FileAccess Access, OpenFlags Flags, unsigned Mode=0666)
Opens a file with the specified creation disposition, access mode, and flags and returns a platform-s...
F(f)
void reserve(size_type N)
Definition: SmallVector.h:369
std::error_code remove_directories(const Twine &path, bool IgnoreErrors=true)
Recursively delete a directory.
Represents the result of a call to sys::fs::status().
Definition: FileSystem.h:246
CD_OpenExisting - When opening a file:
Definition: FileSystem.h:730
struct timespec toTimeSpec(TimePoint<> TP)
Convert a time point to struct timespec.
Definition: Unix.h:83
amode Optimize addressing mode
std::error_code directory_iterator_increment(DirIterState &)
void append(SmallVectorImpl< char > &path, const Twine &a, const Twine &b="", const Twine &c="", const Twine &d="")
Append to path.
Definition: Path.cpp:455
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:80
LLVM_NODISCARD StringRef drop_front(size_t N=1) const
Return a StringRef equal to &#39;this&#39; but with the first N elements dropped.
Definition: StringRef.h:620
std::error_code make_error_code(BitcodeError E)
bool is_absolute(const Twine &path, Style style=Style::native)
Is path absolute?
Definition: Path.cpp:663
Tagged union holding either a T or a Error.
Definition: CachePruning.h:22
LLVM_NODISCARD StringRef substr(size_t Start, size_t N=npos) const
Return a reference to the substring from [Start, Start + N).
Definition: StringRef.h:578
LLVM_NODISCARD bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:126
When a child process is launched, this file should remain open in the child process.
Definition: FileSystem.h:761
CD_CreateNew - When opening a file:
Definition: FileSystem.h:725
std::error_code is_local(const Twine &path, bool &result)
Is the file mounted on a local filesystem?
std::error_code create_link(const Twine &to, const Twine &from)
Create a link from from to to.
LLVM_NODISCARD size_t size() const
size - Get the string size.
Definition: StringRef.h:130
static unsigned getPageSizeEstimate()
Get the process&#39;s estimated page size.
Definition: Process.h:56
std::string getMainExecutable(const char *argv0, void *MainExecAddr)
Return the path to the main executable, given the value of argv[0] from program startup and the addre...
Flag
These should be considered private to the implementation of the MCInstrDesc class.
Definition: MCInstrDesc.h:117
std::error_code copy_file(const Twine &From, const Twine &To)
Copy the contents of From to To.
Definition: Path.cpp:964
std::error_code real_path(const Twine &path, SmallVectorImpl< char > &output, bool expand_tilde=false)
Collapse all .
#define P(N)
initializer< Ty > init(const Ty &Val)
Definition: CommandLine.h:432
static GCRegistry::Add< OcamlGC > B("ocaml", "ocaml 3.10-compatible GC")
void expand_tilde(const Twine &path, SmallVectorImpl< char > &output)
Expands ~ expressions to the user&#39;s home directory.
std::error_code status(const Twine &path, file_status &result, bool follow=true)
Get file status as if by POSIX stat().
UniqueID getUniqueID() const
Error errorCodeToError(std::error_code EC)
Helper for converting an std::error_code to a Error.
Definition: Error.cpp:87
void set_size(size_t N)
Set the array size to N, which the current array must have enough capacity for.
Definition: SmallVector.h:66
std::error_code getError() const
Definition: ErrorOr.h:159
uint32_t getLinkCount() const
TimePoint getLastModificationTime() const
The file modification time as reported from the underlying file system.
StringRef toNullTerminatedStringRef(SmallVectorImpl< char > &Out) const
This returns the twine as a single null terminated StringRef if it can be represented as such...
Definition: Twine.cpp:37
std::error_code resize_file(int FD, uint64_t Size)
Resize path to size.
auto RetryAfterSignal(const FailT &Fail, const Fun &F, const Args &... As) -> decltype(F(As...))
Definition: Errno.h:33
struct timeval toTimeVal(TimePoint< std::chrono::microseconds > TP)
Convert a time point to struct timeval.
Definition: Unix.h:93
size_t capacity() const
Definition: SmallVector.h:53
std::error_code create_hard_link(const Twine &to, const Twine &from)
Create a hard link from from to to, or return an error.
void toVector(SmallVectorImpl< char > &Out) const
Append the concatenated string into the given SmallString or SmallVector.
Definition: Twine.cpp:32
size_t size() const
Definition: SmallVector.h:52
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
std::error_code rename(const Twine &from, const Twine &to)
Rename from to to.
auto size(R &&Range, typename std::enable_if< std::is_same< typename std::iterator_traits< decltype(Range.begin())>::iterator_category, std::random_access_iterator_tag >::value, void >::type *=nullptr) -> decltype(std::distance(Range.begin(), Range.end()))
Get the size of a range.
Definition: STLExtras.h:1173
std::error_code directory_iterator_construct(DirIterState &, StringRef, bool)
BlockVerifier::State From
Expected< file_t > openNativeFileForRead(const Twine &Name, OpenFlags Flags=OF_None, SmallVectorImpl< char > *RealPath=nullptr)
Opens the file with the given name in a read-only mode, returning its open file descriptor.
std::error_code setPermissions(const Twine &Path, perms Permissions)
Set file permissions.
iterator insert(iterator I, T &&Elt)
Definition: SmallVector.h:467
std::error_code set_current_path(const Twine &path)
Set the current path.
iterator begin() const
Definition: StringRef.h:101
void append(in_iter in_start, in_iter in_end)
Add the specified range to the end of the SmallVector.
Definition: SmallVector.h:387
ErrorOr< space_info > disk_space(const Twine &Path)
Get disk space usage information.
std::error_code directory_iterator_destruct(DirIterState &)
pointer data()
Return a pointer to the vector&#39;s buffer, even if empty().
Definition: SmallVector.h:144
Merge contiguous icmps into a memcmp
Definition: MergeICmps.cpp:927
file_type
An enumeration for the file system&#39;s view of the type.
Definition: FileSystem.h:66
static GCRegistry::Add< ErlangGC > A("erlang", "erlang-compatible garbage collector")
std::error_code create_directory(const Twine &path, bool IgnoreExisting=true, perms Perms=owner_all|group_all)
Create the directory in path.
uint32_t Size
Definition: Profile.cpp:46
static std::unique_ptr< MemoryBuffer > openFile(const Twine &Path)
std::string str() const
Return the twine contents as a std::string.
Definition: Twine.cpp:17
void system_temp_directory(bool erasedOnReboot, SmallVectorImpl< char > &result)
Get the typical temporary directory for the system, e.g., "/var/tmp" or "C:/TEMP".
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
bool equivalent(file_status A, file_status B)
Do file_status&#39;s represent the same thing?
CD_CreateAlways - When opening a file:
Definition: FileSystem.h:720
Lightweight error class with error context and mandatory checking.
Definition: Error.h:157
bool home_directory(SmallVectorImpl< char > &result)
Get the user&#39;s home directory.
std::error_code access(const Twine &Path, AccessMode Mode)
Can the file be accessed?
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
CD_OpenAlways - When opening a file:
Definition: FileSystem.h:735
TimePoint getLastAccessedTime() const
The file access time as reported from the underlying file system.
bool is_symlink_file(const basic_file_status &status)
Does status represent a symlink file?
Definition: Path.cpp:1064
bool exists(const basic_file_status &status)
Does file exist?
Definition: Path.cpp:1025
TimePoint< std::chrono::seconds > toTimePoint(std::time_t T)
Convert a std::time_t to a TimePoint.
Definition: Chrono.h:44
void resize(size_type N)
Definition: SmallVector.h:344