Remove LLVM 8.0.1 files.

1 files changed, 0 insertions, 1067 deletions

diff --git a/gnu/llvm/lib/Support/Unix/Path.inc b/gnu/llvm/lib/Support/Unix/Path.inc
deleted file mode 100644
index d7cc0d627d0..00000000000
--- a/gnu/llvm/lib/Support/Unix/Path.inc
+++ /dev/null
@@ -1,1067 +0,0 @@
-//===- llvm/Support/Unix/Path.inc - Unix Path Implementation ----*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements the Unix specific implementation of the Path API.
-//
-//===----------------------------------------------------------------------===//
-
-//===----------------------------------------------------------------------===//
-//=== WARNING: Implementation here must contain only generic UNIX code that
-//===          is guaranteed to work on *all* UNIX variants.
-//===----------------------------------------------------------------------===//
-
-#include "Unix.h"
-#include <limits.h>
-#include <stdio.h>
-#if HAVE_SYS_STAT_H
-#include <sys/stat.h>
-#endif
-#if HAVE_FCNTL_H
-#include <fcntl.h>
-#endif
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-#ifdef HAVE_SYS_MMAN_H
-#include <sys/mman.h>
-#endif
-
-#include <dirent.h>
-#include <pwd.h>
-
-#ifdef __APPLE__
-#include <mach-o/dyld.h>
-#include <sys/attr.h>
-#elif defined(__DragonFly__)
-#include <sys/mount.h>
-#endif
-
-// Both stdio.h and cstdio are included via different paths and
-// stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros
-// either.
-#undef ferror
-#undef feof
-
-// For GNU Hurd
-#if defined(__GNU__) && !defined(PATH_MAX)
-# define PATH_MAX 4096
-# define MAXPATHLEN 4096
-#endif
-
-#include <sys/types.h>
-#if !defined(__APPLE__) && !defined(__OpenBSD__) && !defined(__FreeBSD__) &&   \
-    !defined(__linux__) && !defined(__FreeBSD_kernel__)
-#include <sys/statvfs.h>
-#define STATVFS statvfs
-#define FSTATVFS fstatvfs
-#define STATVFS_F_FRSIZE(vfs) vfs.f_frsize
-#else
-#if defined(__OpenBSD__) || defined(__FreeBSD__)
-#include <sys/mount.h>
-#include <sys/param.h>
-#elif defined(__linux__)
-#if defined(HAVE_LINUX_MAGIC_H)
-#include <linux/magic.h>
-#else
-#if defined(HAVE_LINUX_NFS_FS_H)
-#include <linux/nfs_fs.h>
-#endif
-#if defined(HAVE_LINUX_SMB_H)
-#include <linux/smb.h>
-#endif
-#endif
-#include <sys/vfs.h>
-#else
-#include <sys/mount.h>
-#endif
-#define STATVFS statfs
-#define FSTATVFS fstatfs
-#define STATVFS_F_FRSIZE(vfs) static_cast<uint64_t>(vfs.f_bsize)
-#endif
-
-#if defined(__NetBSD__) || defined(__DragonFly__) || defined(__GNU__)
-#define STATVFS_F_FLAG(vfs) (vfs).f_flag
-#else
-#define STATVFS_F_FLAG(vfs) (vfs).f_flags
-#endif
-
-using namespace llvm;
-
-namespace llvm {
-namespace sys  {
-namespace fs {
-
-const file_t kInvalidFile = -1;
-
-#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) ||     \
-    defined(__minix) || defined(__FreeBSD_kernel__) || defined(__linux__) ||   \
-    defined(__CYGWIN__) || defined(__DragonFly__) || defined(_AIX) || defined(__GNU__)
-static int
-test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
-{
-  struct stat sb;
-  char fullpath[PATH_MAX];
-
-  snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
-  if (!realpath(fullpath, ret))
-    return 1;
-  if (stat(fullpath, &sb) != 0)
-    return 1;
-
-  return 0;
-}
-
-static char *
-getprogpath(char ret[PATH_MAX], const char *bin)
-{
-  char *pv, *s, *t;
-
-  /* First approach: absolute path. */
-  if (bin[0] == '/') {
-    if (test_dir(ret, "/", bin) == 0)
-      return ret;
-    return nullptr;
-  }
-
-  /* Second approach: relative path. */
-  if (strchr(bin, '/')) {
-    char cwd[PATH_MAX];
-    if (!getcwd(cwd, PATH_MAX))
-      return nullptr;
-    if (test_dir(ret, cwd, bin) == 0)
-      return ret;
-    return nullptr;
-  }
-
-  /* Third approach: $PATH */
-  if ((pv = getenv("PATH")) == nullptr)
-    return nullptr;
-  s = pv = strdup(pv);
-  if (!pv)
-    return nullptr;
-  while ((t = strsep(&s, ":")) != nullptr) {
-    if (test_dir(ret, t, bin) == 0) {
-      free(pv);
-      return ret;
-    }
-  }
-  free(pv);
-  return nullptr;
-}
-#endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__
-
-/// GetMainExecutable - Return the path to the main executable, given the
-/// value of argv[0] from program startup.
-std::string getMainExecutable(const char *argv0, void *MainAddr) {
-#if defined(__APPLE__)
-  // On OS X the executable path is saved to the stack by dyld. Reading it
-  // from there is much faster than calling dladdr, especially for large
-  // binaries with symbols.
-  char exe_path[MAXPATHLEN];
-  uint32_t size = sizeof(exe_path);
-  if (_NSGetExecutablePath(exe_path, &size) == 0) {
-    char link_path[MAXPATHLEN];
-    if (realpath(exe_path, link_path))
-      return link_path;
-  }
-#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) ||   \
-    defined(__minix) || defined(__DragonFly__) ||                              \
-    defined(__FreeBSD_kernel__) || defined(_AIX)
-  char exe_path[PATH_MAX];
-
-  if (getprogpath(exe_path, argv0) != NULL)
-    return exe_path;
-#elif defined(__linux__) || defined(__CYGWIN__)
-  char exe_path[MAXPATHLEN];
-  StringRef aPath("/proc/self/exe");
-  if (sys::fs::exists(aPath)) {
-    // /proc is not always mounted under Linux (chroot for example).
-    ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path));
-    if (len < 0)
-      return "";
-
-    // Null terminate the string for realpath. readlink never null
-    // terminates its output.
-    len = std::min(len, ssize_t(sizeof(exe_path) - 1));
-    exe_path[len] = '\0';
-
-    // On Linux, /proc/self/exe always looks through symlinks. However, on
-    // GNU/Hurd, /proc/self/exe is a symlink to the path that was used to start
-    // the program, and not the eventual binary file. Therefore, call realpath
-    // so this behaves the same on all platforms.
-#if _POSIX_VERSION >= 200112 || defined(__GLIBC__)
-    char *real_path = realpath(exe_path, NULL);
-    std::string ret = std::string(real_path);
-    free(real_path);
-    return ret;
-#else
-    char real_path[MAXPATHLEN];
-    realpath(exe_path, real_path);
-    return std::string(real_path);
-#endif
-  } else {
-    // Fall back to the classical detection.
-    if (getprogpath(exe_path, argv0))
-      return exe_path;
-  }
-#elif defined(HAVE_DLFCN_H) && defined(HAVE_DLADDR)
-  // Use dladdr to get executable path if available.
-  Dl_info DLInfo;
-  int err = dladdr(MainAddr, &DLInfo);
-  if (err == 0)
-    return "";
-
-  // If the filename is a symlink, we need to resolve and return the location of
-  // the actual executable.
-  char link_path[MAXPATHLEN];
-  if (realpath(DLInfo.dli_fname, link_path))
-    return link_path;
-#else
-#error GetMainExecutable is not implemented on this host yet.
-#endif
-  return "";
-}
-
-TimePoint<> basic_file_status::getLastAccessedTime() const {
-  return toTimePoint(fs_st_atime, fs_st_atime_nsec);
-}
-
-TimePoint<> basic_file_status::getLastModificationTime() const {
-  return toTimePoint(fs_st_mtime, fs_st_mtime_nsec);
-}
-
-UniqueID file_status::getUniqueID() const {
-  return UniqueID(fs_st_dev, fs_st_ino);
-}
-
-uint32_t file_status::getLinkCount() const {
-  return fs_st_nlinks;
-}
-
-ErrorOr<space_info> disk_space(const Twine &Path) {
-  struct STATVFS Vfs;
-  if (::STATVFS(Path.str().c_str(), &Vfs))
-    return std::error_code(errno, std::generic_category());
-  auto FrSize = STATVFS_F_FRSIZE(Vfs);
-  space_info SpaceInfo;
-  SpaceInfo.capacity = static_cast<uint64_t>(Vfs.f_blocks) * FrSize;
-  SpaceInfo.free = static_cast<uint64_t>(Vfs.f_bfree) * FrSize;
-  SpaceInfo.available = static_cast<uint64_t>(Vfs.f_bavail) * FrSize;
-  return SpaceInfo;
-}
-
-std::error_code current_path(SmallVectorImpl<char> &result) {
-  result.clear();
-
-  const char *pwd = ::getenv("PWD");
-  llvm::sys::fs::file_status PWDStatus, DotStatus;
-  if (pwd && llvm::sys::path::is_absolute(pwd) &&
-      !llvm::sys::fs::status(pwd, PWDStatus) &&
-      !llvm::sys::fs::status(".", DotStatus) &&
-      PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
-    result.append(pwd, pwd + strlen(pwd));
-    return std::error_code();
-  }
-
-#ifdef MAXPATHLEN
-  result.reserve(MAXPATHLEN);
-#else
-// For GNU Hurd
-  result.reserve(1024);
-#endif
-
-  while (true) {
-    if (::getcwd(result.data(), result.capacity()) == nullptr) {
-      // See if there was a real error.
-      if (errno != ENOMEM)
-        return std::error_code(errno, std::generic_category());
-      // Otherwise there just wasn't enough space.
-      result.reserve(result.capacity() * 2);
-    } else
-      break;
-  }
-
-  result.set_size(strlen(result.data()));
-  return std::error_code();
-}
-
-std::error_code set_current_path(const Twine &path) {
-  SmallString<128> path_storage;
-  StringRef p = path.toNullTerminatedStringRef(path_storage);
-
-  if (::chdir(p.begin()) == -1)
-    return std::error_code(errno, std::generic_category());
-
-  return std::error_code();
-}
-
-std::error_code create_directory(const Twine &path, bool IgnoreExisting,
-                                 perms Perms) {
-  SmallString<128> path_storage;
-  StringRef p = path.toNullTerminatedStringRef(path_storage);
-
-  if (::mkdir(p.begin(), Perms) == -1) {
-    if (errno != EEXIST || !IgnoreExisting)
-      return std::error_code(errno, std::generic_category());
-  }
-
-  return std::error_code();
-}
-
-// Note that we are using symbolic link because hard links are not supported by
-// all filesystems (SMB doesn't).
-std::error_code create_link(const Twine &to, const Twine &from) {
-  // Get arguments.
-  SmallString<128> from_storage;
-  SmallString<128> to_storage;
-  StringRef f = from.toNullTerminatedStringRef(from_storage);
-  StringRef t = to.toNullTerminatedStringRef(to_storage);
-
-  if (::symlink(t.begin(), f.begin()) == -1)
-    return std::error_code(errno, std::generic_category());
-
-  return std::error_code();
-}
-
-std::error_code create_hard_link(const Twine &to, const Twine &from) {
-  // Get arguments.
-  SmallString<128> from_storage;
-  SmallString<128> to_storage;
-  StringRef f = from.toNullTerminatedStringRef(from_storage);
-  StringRef t = to.toNullTerminatedStringRef(to_storage);
-
-  if (::link(t.begin(), f.begin()) == -1)
-    return std::error_code(errno, std::generic_category());
-
-  return std::error_code();
-}
-
-std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
-  SmallString<128> path_storage;
-  StringRef p = path.toNullTerminatedStringRef(path_storage);
-
-  struct stat buf;
-  if (lstat(p.begin(), &buf) != 0) {
-    if (errno != ENOENT || !IgnoreNonExisting)
-      return std::error_code(errno, std::generic_category());
-    return std::error_code();
-  }
-
-  // Note: this check catches strange situations. In all cases, LLVM should
-  // only be involved in the creation and deletion of regular files.  This
-  // check ensures that what we're trying to erase is a regular file. It
-  // effectively prevents LLVM from erasing things like /dev/null, any block
-  // special file, or other things that aren't "regular" files.
-  if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
-    return make_error_code(errc::operation_not_permitted);
-
-  if (::remove(p.begin()) == -1) {
-    if (errno != ENOENT || !IgnoreNonExisting)
-      return std::error_code(errno, std::generic_category());
-  }
-
-  return std::error_code();
-}
-
-static bool is_local_impl(struct STATVFS &Vfs) {
-#if defined(__linux__) || defined(__GNU__)
-#ifndef NFS_SUPER_MAGIC
-#define NFS_SUPER_MAGIC 0x6969
-#endif
-#ifndef SMB_SUPER_MAGIC
-#define SMB_SUPER_MAGIC 0x517B
-#endif
-#ifndef CIFS_MAGIC_NUMBER
-#define CIFS_MAGIC_NUMBER 0xFF534D42
-#endif
-#ifdef __GNU__
-  switch ((uint32_t)Vfs.__f_type) {
-#else
-  switch ((uint32_t)Vfs.f_type) {
-#endif
-  case NFS_SUPER_MAGIC:
-  case SMB_SUPER_MAGIC:
-  case CIFS_MAGIC_NUMBER:
-    return false;
-  default:
-    return true;
-  }
-#elif defined(__CYGWIN__)
-  // Cygwin doesn't expose this information; would need to use Win32 API.
-  return false;
-#elif defined(__Fuchsia__)
-  // Fuchsia doesn't yet support remote filesystem mounts.
-  return true;
-#elif defined(__HAIKU__)
-  // Haiku doesn't expose this information.
-  return false;
-#elif defined(__sun)
-  // statvfs::f_basetype contains a null-terminated FSType name of the mounted target
-  StringRef fstype(Vfs.f_basetype);
-  // NFS is the only non-local fstype??
-  return !fstype.equals("nfs");
-#else
-  return !!(STATVFS_F_FLAG(Vfs) & MNT_LOCAL);
-#endif
-}
-
-std::error_code is_local(const Twine &Path, bool &Result) {
-  struct STATVFS Vfs;
-  if (::STATVFS(Path.str().c_str(), &Vfs))
-    return std::error_code(errno, std::generic_category());
-
-  Result = is_local_impl(Vfs);
-  return std::error_code();
-}
-
-std::error_code is_local(int FD, bool &Result) {
-  struct STATVFS Vfs;
-  if (::FSTATVFS(FD, &Vfs))
-    return std::error_code(errno, std::generic_category());
-
-  Result = is_local_impl(Vfs);
-  return std::error_code();
-}
-
-std::error_code rename(const Twine &from, const Twine &to) {
-  // Get arguments.
-  SmallString<128> from_storage;
-  SmallString<128> to_storage;
-  StringRef f = from.toNullTerminatedStringRef(from_storage);
-  StringRef t = to.toNullTerminatedStringRef(to_storage);
-
-  if (::rename(f.begin(), t.begin()) == -1)
-    return std::error_code(errno, std::generic_category());
-
-  return std::error_code();
-}
-
-std::error_code resize_file(int FD, uint64_t Size) {
-#if defined(HAVE_POSIX_FALLOCATE)
-  // If we have posix_fallocate use it. Unlike ftruncate it always allocates
-  // space, so we get an error if the disk is full.
-  if (int Err = ::posix_fallocate(FD, 0, Size)) {
-    if (Err != EINVAL && Err != EOPNOTSUPP)
-      return std::error_code(Err, std::generic_category());
-  }
-#endif
-  // Use ftruncate as a fallback. It may or may not allocate space. At least on
-  // OS X with HFS+ it does.
-  if (::ftruncate(FD, Size) == -1)
-    return std::error_code(errno, std::generic_category());
-
-  return std::error_code();
-}
-
-static int convertAccessMode(AccessMode Mode) {
-  switch (Mode) {
-  case AccessMode::Exist:
-    return F_OK;
-  case AccessMode::Write:
-    return W_OK;
-  case AccessMode::Execute:
-    return R_OK | X_OK; // scripts also need R_OK.
-  }
-  llvm_unreachable("invalid enum");
-}
-
-std::error_code access(const Twine &Path, AccessMode Mode) {
-  SmallString<128> PathStorage;
-  StringRef P = Path.toNullTerminatedStringRef(PathStorage);
-
-  if (::access(P.begin(), convertAccessMode(Mode)) == -1)
-    return std::error_code(errno, std::generic_category());
-
-  if (Mode == AccessMode::Execute) {
-    // Don't say that directories are executable.
-    struct stat buf;
-    if (0 != stat(P.begin(), &buf))
-      return errc::permission_denied;
-    if (!S_ISREG(buf.st_mode))
-      return errc::permission_denied;
-  }
-
-  return std::error_code();
-}
-
-bool can_execute(const Twine &Path) {
-  return !access(Path, AccessMode::Execute);
-}
-
-bool equivalent(file_status A, file_status B) {
-  assert(status_known(A) && status_known(B));
-  return A.fs_st_dev == B.fs_st_dev &&
-         A.fs_st_ino == B.fs_st_ino;
-}
-
-std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
-  file_status fsA, fsB;
-  if (std::error_code ec = status(A, fsA))
-    return ec;
-  if (std::error_code ec = status(B, fsB))
-    return ec;
-  result = equivalent(fsA, fsB);
-  return std::error_code();
-}
-
-static void expandTildeExpr(SmallVectorImpl<char> &Path) {
-  StringRef PathStr(Path.begin(), Path.size());
-  if (PathStr.empty() || !PathStr.startswith("~"))
-    return;
-
-  PathStr = PathStr.drop_front();
-  StringRef Expr =
-      PathStr.take_until([](char c) { return path::is_separator(c); });
-  StringRef Remainder = PathStr.substr(Expr.size() + 1);
-  SmallString<128> Storage;
-  if (Expr.empty()) {
-    // This is just ~/..., resolve it to the current user's home dir.
-    if (!path::home_directory(Storage)) {
-      // For some reason we couldn't get the home directory.  Just exit.
-      return;
-    }
-
-    // Overwrite the first character and insert the rest.
-    Path[0] = Storage[0];
-    Path.insert(Path.begin() + 1, Storage.begin() + 1, Storage.end());
-    return;
-  }
-
-  // This is a string of the form ~username/, look up this user's entry in the
-  // password database.
-  struct passwd *Entry = nullptr;
-  std::string User = Expr.str();
-  Entry = ::getpwnam(User.c_str());
-
-  if (!Entry) {
-    // Unable to look up the entry, just return back the original path.
-    return;
-  }
-
-  Storage = Remainder;
-  Path.clear();
-  Path.append(Entry->pw_dir, Entry->pw_dir + strlen(Entry->pw_dir));
-  llvm::sys::path::append(Path, Storage);
-}
-
-
-void expand_tilde(const Twine &path, SmallVectorImpl<char> &dest) {
-  dest.clear();
-  if (path.isTriviallyEmpty())
-    return;
-
-  path.toVector(dest);
-  expandTildeExpr(dest);
-
-  return;
-}
-
-static file_type typeForMode(mode_t Mode) {
-  if (S_ISDIR(Mode))
-    return file_type::directory_file;
-  else if (S_ISREG(Mode))
-    return file_type::regular_file;
-  else if (S_ISBLK(Mode))
-    return file_type::block_file;
-  else if (S_ISCHR(Mode))
-    return file_type::character_file;
-  else if (S_ISFIFO(Mode))
-    return file_type::fifo_file;
-  else if (S_ISSOCK(Mode))
-    return file_type::socket_file;
-  else if (S_ISLNK(Mode))
-    return file_type::symlink_file;
-  return file_type::type_unknown;
-}
-
-static std::error_code fillStatus(int StatRet, const struct stat &Status,
-                                  file_status &Result) {
-  if (StatRet != 0) {
-    std::error_code EC(errno, std::generic_category());
-    if (EC == errc::no_such_file_or_directory)
-      Result = file_status(file_type::file_not_found);
-    else
-      Result = file_status(file_type::status_error);
-    return EC;
-  }
-
-  uint32_t atime_nsec, mtime_nsec;
-#if defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
-  atime_nsec = Status.st_atimespec.tv_nsec;
-  mtime_nsec = Status.st_mtimespec.tv_nsec;
-#elif defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
-  atime_nsec = Status.st_atim.tv_nsec;
-  mtime_nsec = Status.st_mtim.tv_nsec;
-#else
-  atime_nsec = mtime_nsec = 0;
-#endif
-
-  perms Perms = static_cast<perms>(Status.st_mode) & all_perms;
-  Result = file_status(typeForMode(Status.st_mode), Perms, Status.st_dev,
-                       Status.st_nlink, Status.st_ino,
-                       Status.st_atime, atime_nsec, Status.st_mtime, mtime_nsec,
-                       Status.st_uid, Status.st_gid, Status.st_size);
-
-  return std::error_code();
-}
-
-std::error_code status(const Twine &Path, file_status &Result, bool Follow) {
-  SmallString<128> PathStorage;
-  StringRef P = Path.toNullTerminatedStringRef(PathStorage);
-
-  struct stat Status;
-  int StatRet = (Follow ? ::stat : ::lstat)(P.begin(), &Status);
-  return fillStatus(StatRet, Status, Result);
-}
-
-std::error_code status(int FD, file_status &Result) {
-  struct stat Status;
-  int StatRet = ::fstat(FD, &Status);
-  return fillStatus(StatRet, Status, Result);
-}
-
-std::error_code setPermissions(const Twine &Path, perms Permissions) {
-  SmallString<128> PathStorage;
-  StringRef P = Path.toNullTerminatedStringRef(PathStorage);
-
-  if (::chmod(P.begin(), Permissions))
-    return std::error_code(errno, std::generic_category());
-  return std::error_code();
-}
-
-std::error_code setLastAccessAndModificationTime(int FD, TimePoint<> AccessTime,
-                                                 TimePoint<> ModificationTime) {
-#if defined(HAVE_FUTIMENS)
-  timespec Times[2];
-  Times[0] = sys::toTimeSpec(AccessTime);
-  Times[1] = sys::toTimeSpec(ModificationTime);
-  if (::futimens(FD, Times))
-    return std::error_code(errno, std::generic_category());
-  return std::error_code();
-#elif defined(HAVE_FUTIMES)
-  timeval Times[2];
-  Times[0] = sys::toTimeVal(
-      std::chrono::time_point_cast<std::chrono::microseconds>(AccessTime));
-  Times[1] =
-      sys::toTimeVal(std::chrono::time_point_cast<std::chrono::microseconds>(
-          ModificationTime));
-  if (::futimes(FD, Times))
-    return std::error_code(errno, std::generic_category());
-  return std::error_code();
-#else
-#warning Missing futimes() and futimens()
-  return make_error_code(errc::function_not_supported);
-#endif
-}
-
-std::error_code mapped_file_region::init(int FD, uint64_t Offset,
-                                         mapmode Mode) {
-  assert(Size != 0);
-
-  int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
-  int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
-#if defined(__APPLE__)
-  //----------------------------------------------------------------------
-  // Newer versions of MacOSX have a flag that will allow us to read from
-  // binaries whose code signature is invalid without crashing by using
-  // the MAP_RESILIENT_CODESIGN flag. Also if a file from removable media
-  // is mapped we can avoid crashing and return zeroes to any pages we try
-  // to read if the media becomes unavailable by using the
-  // MAP_RESILIENT_MEDIA flag.  These flags are only usable when mapping
-  // with PROT_READ, so take care not to specify them otherwise.
-  //----------------------------------------------------------------------
-  if (Mode == readonly) {
-#if defined(MAP_RESILIENT_CODESIGN)
-    flags |= MAP_RESILIENT_CODESIGN;
-#endif
-#if defined(MAP_RESILIENT_MEDIA)
-    flags |= MAP_RESILIENT_MEDIA;
-#endif
-  }
-#endif // #if defined (__APPLE__)
-
-  Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
-  if (Mapping == MAP_FAILED)
-    return std::error_code(errno, std::generic_category());
-  return std::error_code();
-}
-
-mapped_file_region::mapped_file_region(int fd, mapmode mode, size_t length,
-                                       uint64_t offset, std::error_code &ec)
-    : Size(length), Mapping(), Mode(mode) {
-  (void)Mode;
-  ec = init(fd, offset, mode);
-  if (ec)
-    Mapping = nullptr;
-}
-
-mapped_file_region::~mapped_file_region() {
-  if (Mapping)
-    ::munmap(Mapping, Size);
-}
-
-size_t mapped_file_region::size() const {
-  assert(Mapping && "Mapping failed but used anyway!");
-  return Size;
-}
-
-char *mapped_file_region::data() const {
-  assert(Mapping && "Mapping failed but used anyway!");
-  return reinterpret_cast<char*>(Mapping);
-}
-
-const char *mapped_file_region::const_data() const {
-  assert(Mapping && "Mapping failed but used anyway!");
-  return reinterpret_cast<const char*>(Mapping);
-}
-
-int mapped_file_region::alignment() {
-  return Process::getPageSize();
-}
-
-std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
-                                                     StringRef path,
-                                                     bool follow_symlinks) {
-  SmallString<128> path_null(path);
-  DIR *directory = ::opendir(path_null.c_str());
-  if (!directory)
-    return std::error_code(errno, std::generic_category());
-
-  it.IterationHandle = reinterpret_cast<intptr_t>(directory);
-  // Add something for replace_filename to replace.
-  path::append(path_null, ".");
-  it.CurrentEntry = directory_entry(path_null.str(), follow_symlinks);
-  return directory_iterator_increment(it);
-}
-
-std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
-  if (it.IterationHandle)
-    ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
-  it.IterationHandle = 0;
-  it.CurrentEntry = directory_entry();
-  return std::error_code();
-}
-
-static file_type direntType(dirent* Entry) {
-  // Most platforms provide the file type in the dirent: Linux/BSD/Mac.
-  // The DTTOIF macro lets us reuse our status -> type conversion.
-#if defined(_DIRENT_HAVE_D_TYPE) && defined(DTTOIF)
-  return typeForMode(DTTOIF(Entry->d_type));
-#else
-  // Other platforms such as Solaris require a stat() to get the type.
-  return file_type::type_unknown;
-#endif
-}
-
-std::error_code detail::directory_iterator_increment(detail::DirIterState &It) {
-  errno = 0;
-  dirent *CurDir = ::readdir(reinterpret_cast<DIR *>(It.IterationHandle));
-  if (CurDir == nullptr && errno != 0) {
-    return std::error_code(errno, std::generic_category());
-  } else if (CurDir != nullptr) {
-    StringRef Name(CurDir->d_name);
-    if ((Name.size() == 1 && Name[0] == '.') ||
-        (Name.size() == 2 && Name[0] == '.' && Name[1] == '.'))
-      return directory_iterator_increment(It);
-    It.CurrentEntry.replace_filename(Name, direntType(CurDir));
-  } else
-    return directory_iterator_destruct(It);
-
-  return std::error_code();
-}
-
-ErrorOr<basic_file_status> directory_entry::status() const {
-  file_status s;
-  if (auto EC = fs::status(Path, s, FollowSymlinks))
-    return EC;
-  return s;
-}
-
-#if !defined(F_GETPATH)
-static bool hasProcSelfFD() {
-  // If we have a /proc filesystem mounted, we can quickly establish the
-  // real name of the file with readlink
-  static const bool Result = (::access("/proc/self/fd", R_OK) == 0);
-  return Result;
-}
-#endif
-
-static int nativeOpenFlags(CreationDisposition Disp, OpenFlags Flags,
-                           FileAccess Access) {
-  int Result = 0;
-  if (Access == FA_Read)
-    Result |= O_RDONLY;
-  else if (Access == FA_Write)
-    Result |= O_WRONLY;
-  else if (Access == (FA_Read | FA_Write))
-    Result |= O_RDWR;
-
-  // This is for compatibility with old code that assumed F_Append implied
-  // would open an existing file.  See Windows/Path.inc for a longer comment.
-  if (Flags & F_Append)
-    Disp = CD_OpenAlways;
-
-  if (Disp == CD_CreateNew) {
-    Result |= O_CREAT; // Create if it doesn't exist.
-    Result |= O_EXCL;  // Fail if it does.
-  } else if (Disp == CD_CreateAlways) {
-    Result |= O_CREAT; // Create if it doesn't exist.
-    Result |= O_TRUNC; // Truncate if it does.
-  } else if (Disp == CD_OpenAlways) {
-    Result |= O_CREAT; // Create if it doesn't exist.
-  } else if (Disp == CD_OpenExisting) {
-    // Nothing special, just don't add O_CREAT and we get these semantics.
-  }
-
-  if (Flags & F_Append)
-    Result |= O_APPEND;
-
-#ifdef O_CLOEXEC
-  if (!(Flags & OF_ChildInherit))
-    Result |= O_CLOEXEC;
-#endif
-
-  return Result;
-}
-
-std::error_code openFile(const Twine &Name, int &ResultFD,
-                         CreationDisposition Disp, FileAccess Access,
-                         OpenFlags Flags, unsigned Mode) {
-  int OpenFlags = nativeOpenFlags(Disp, Flags, Access);
-
-  SmallString<128> Storage;
-  StringRef P = Name.toNullTerminatedStringRef(Storage);
-  // Call ::open in a lambda to avoid overload resolution in RetryAfterSignal
-  // when open is overloaded, such as in Bionic.
-  auto Open = [&]() { return ::open(P.begin(), OpenFlags, Mode); };
-  if ((ResultFD = sys::RetryAfterSignal(-1, Open)) < 0)
-    return std::error_code(errno, std::generic_category());
-#ifndef O_CLOEXEC
-  if (!(Flags & OF_ChildInherit)) {
-    int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
-    (void)r;
-    assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
-  }
-#endif
-  return std::error_code();
-}
-
-Expected<int> openNativeFile(const Twine &Name, CreationDisposition Disp,
-                             FileAccess Access, OpenFlags Flags,
-                             unsigned Mode) {
-
-  int FD;
-  std::error_code EC = openFile(Name, FD, Disp, Access, Flags, Mode);
-  if (EC)
-    return errorCodeToError(EC);
-  return FD;
-}
-
-std::error_code openFileForRead(const Twine &Name, int &ResultFD,
-                                OpenFlags Flags,
-                                SmallVectorImpl<char> *RealPath) {
-  std::error_code EC =
-      openFile(Name, ResultFD, CD_OpenExisting, FA_Read, Flags, 0666);
-  if (EC)
-    return EC;
-
-  // Attempt to get the real name of the file, if the user asked
-  if(!RealPath)
-    return std::error_code();
-  RealPath->clear();
-#if defined(F_GETPATH)
-  // When F_GETPATH is availble, it is the quickest way to get
-  // the real path name.
-  char Buffer[MAXPATHLEN];
-  if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1)
-    RealPath->append(Buffer, Buffer + strlen(Buffer));
-#else
-  char Buffer[PATH_MAX];
-  if (hasProcSelfFD()) {
-    char ProcPath[64];
-    snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", ResultFD);
-    ssize_t CharCount = ::readlink(ProcPath, Buffer, sizeof(Buffer));
-    if (CharCount > 0)
-      RealPath->append(Buffer, Buffer + CharCount);
-  } else {
-    SmallString<128> Storage;
-    StringRef P = Name.toNullTerminatedStringRef(Storage);
-
-    // Use ::realpath to get the real path name
-    if (::realpath(P.begin(), Buffer) != nullptr)
-      RealPath->append(Buffer, Buffer + strlen(Buffer));
-  }
-#endif
-  return std::error_code();
-}
-
-Expected<file_t> openNativeFileForRead(const Twine &Name, OpenFlags Flags,
-                                       SmallVectorImpl<char> *RealPath) {
-  file_t ResultFD;
-  std::error_code EC = openFileForRead(Name, ResultFD, Flags, RealPath);
-  if (EC)
-    return errorCodeToError(EC);
-  return ResultFD;
-}
-
-void closeFile(file_t &F) {
-  ::close(F);
-  F = kInvalidFile;
-}
-
-template <typename T>
-static std::error_code remove_directories_impl(const T &Entry,
-                                               bool IgnoreErrors) {
-  std::error_code EC;
-  directory_iterator Begin(Entry, EC, false);
-  directory_iterator End;
-  while (Begin != End) {
-    auto &Item = *Begin;
-    ErrorOr<basic_file_status> st = Item.status();
-    if (!st && !IgnoreErrors)
-      return st.getError();
-
-    if (is_directory(*st)) {
-      EC = remove_directories_impl(Item, IgnoreErrors);
-      if (EC && !IgnoreErrors)
-        return EC;
-    }
-
-    EC = fs::remove(Item.path(), true);
-    if (EC && !IgnoreErrors)
-      return EC;
-
-    Begin.increment(EC);
-    if (EC && !IgnoreErrors)
-      return EC;
-  }
-  return std::error_code();
-}
-
-std::error_code remove_directories(const Twine &path, bool IgnoreErrors) {
-  auto EC = remove_directories_impl(path, IgnoreErrors);
-  if (EC && !IgnoreErrors)
-    return EC;
-  EC = fs::remove(path, true);
-  if (EC && !IgnoreErrors)
-    return EC;
-  return std::error_code();
-}
-
-std::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest,
-                          bool expand_tilde) {
-  dest.clear();
-  if (path.isTriviallyEmpty())
-    return std::error_code();
-
-  if (expand_tilde) {
-    SmallString<128> Storage;
-    path.toVector(Storage);
-    expandTildeExpr(Storage);
-    return real_path(Storage, dest, false);
-  }
-
-  SmallString<128> Storage;
-  StringRef P = path.toNullTerminatedStringRef(Storage);
-  char Buffer[PATH_MAX];
-  if (::realpath(P.begin(), Buffer) == nullptr)
-    return std::error_code(errno, std::generic_category());
-  dest.append(Buffer, Buffer + strlen(Buffer));
-  return std::error_code();
-}
-
-} // end namespace fs
-
-namespace path {
-
-bool home_directory(SmallVectorImpl<char> &result) {
-  char *RequestedDir = getenv("HOME");
-  if (!RequestedDir) {
-    struct passwd *pw = getpwuid(getuid());
-    if (pw && pw->pw_dir)
-      RequestedDir = pw->pw_dir;
-  }
-  if (!RequestedDir)
-    return false;
-
-  result.clear();
-  result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
-  return true;
-}
-
-static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) {
-  #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
-  // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
-  // macros defined in <unistd.h> on darwin >= 9
-  int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR
-                         : _CS_DARWIN_USER_CACHE_DIR;
-  size_t ConfLen = confstr(ConfName, nullptr, 0);
-  if (ConfLen > 0) {
-    do {
-      Result.resize(ConfLen);
-      ConfLen = confstr(ConfName, Result.data(), Result.size());
-    } while (ConfLen > 0 && ConfLen != Result.size());
-
-    if (ConfLen > 0) {
-      assert(Result.back() == 0);
-      Result.pop_back();
-      return true;
-    }
-
-    Result.clear();
-  }
-  #endif
-  return false;
-}
-
-static const char *getEnvTempDir() {
-  // Check whether the temporary directory is specified by an environment
-  // variable.
-  const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
-  for (const char *Env : EnvironmentVariables) {
-    if (const char *Dir = std::getenv(Env))
-      return Dir;
-  }
-
-  return nullptr;
-}
-
-static const char *getDefaultTempDir(bool ErasedOnReboot) {
-#ifdef P_tmpdir
-  if ((bool)P_tmpdir)
-    return P_tmpdir;
-#endif
-
-  if (ErasedOnReboot)
-    return "/tmp";
-  return "/var/tmp";
-}
-
-void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
-  Result.clear();
-
-  if (ErasedOnReboot) {
-    // There is no env variable for the cache directory.
-    if (const char *RequestedDir = getEnvTempDir()) {
-      Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
-      return;
-    }
-  }
-
-  if (getDarwinConfDir(ErasedOnReboot, Result))
-    return;
-
-  const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
-  Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
-}
-
-} // end namespace path
-
-} // end namespace sys
-} // end namespace llvm