Rename PathV2 to just Path now that it is the only one.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185015 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1092 insertions, 0 deletions

diff --git a/lib/Support/Windows/Path.inc b/lib/Support/Windows/Path.inc
new file mode 100644
index 0000000..2b24c54
--- /dev/null
+++ b/lib/Support/Windows/Path.inc
@@ -0,0 +1,1092 @@
+//===- llvm/Support/Windows/Path.inc - Windows Path Impl --------*- 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 Windows specific implementation of the Path API.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic Windows code that
+//===          is guaranteed to work on *all* Windows variants.
+//===----------------------------------------------------------------------===//
+
+#include "Windows.h"
+#include <fcntl.h>
+#include <io.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#undef max
+
+// MinGW doesn't define this.
+#ifndef _ERRNO_T_DEFINED
+#define _ERRNO_T_DEFINED
+typedef int errno_t;
+#endif
+
+using namespace llvm;
+
+namespace {
+  typedef BOOLEAN (WINAPI *PtrCreateSymbolicLinkW)(
+    /*__in*/ LPCWSTR lpSymlinkFileName,
+    /*__in*/ LPCWSTR lpTargetFileName,
+    /*__in*/ DWORD dwFlags);
+
+  PtrCreateSymbolicLinkW create_symbolic_link_api = PtrCreateSymbolicLinkW(
+    ::GetProcAddress(::GetModuleHandleA("kernel32.dll"),
+                     "CreateSymbolicLinkW"));
+
+  error_code UTF8ToUTF16(StringRef utf8, SmallVectorImpl<wchar_t> &utf16) {
+    int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
+                                    utf8.begin(), utf8.size(),
+                                    utf16.begin(), 0);
+
+    if (len == 0)
+      return windows_error(::GetLastError());
+
+    utf16.reserve(len + 1);
+    utf16.set_size(len);
+
+    len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
+                                    utf8.begin(), utf8.size(),
+                                    utf16.begin(), utf16.size());
+
+    if (len == 0)
+      return windows_error(::GetLastError());
+
+    // Make utf16 null terminated.
+    utf16.push_back(0);
+    utf16.pop_back();
+
+    return error_code::success();
+  }
+
+  error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
+                               SmallVectorImpl<char> &utf8) {
+    // Get length.
+    int len = ::WideCharToMultiByte(CP_UTF8, 0,
+                                    utf16, utf16_len,
+                                    utf8.begin(), 0,
+                                    NULL, NULL);
+
+    if (len == 0)
+      return windows_error(::GetLastError());
+
+    utf8.reserve(len);
+    utf8.set_size(len);
+
+    // Now do the actual conversion.
+    len = ::WideCharToMultiByte(CP_UTF8, 0,
+                                utf16, utf16_len,
+                                utf8.data(), utf8.size(),
+                                NULL, NULL);
+
+    if (len == 0)
+      return windows_error(::GetLastError());
+
+    // Make utf8 null terminated.
+    utf8.push_back(0);
+    utf8.pop_back();
+
+    return error_code::success();
+  }
+
+  error_code TempDir(SmallVectorImpl<wchar_t> &result) {
+  retry_temp_dir:
+    DWORD len = ::GetTempPathW(result.capacity(), result.begin());
+
+    if (len == 0)
+      return windows_error(::GetLastError());
+
+    if (len > result.capacity()) {
+      result.reserve(len);
+      goto retry_temp_dir;
+    }
+
+    result.set_size(len);
+    return error_code::success();
+  }
+
+  bool is_separator(const wchar_t value) {
+    switch (value) {
+    case L'\\':
+    case L'/':
+      return true;
+    default:
+      return false;
+    }
+  }
+}
+
+namespace llvm {
+namespace sys  {
+namespace fs {
+
+std::string getMainExecutable(const char *argv0, void *MainExecAddr) {
+  char pathname[MAX_PATH];
+  DWORD ret = ::GetModuleFileNameA(NULL, pathname, MAX_PATH);
+  return ret != MAX_PATH ? pathname : "";
+}
+
+
+TimeValue file_status::getLastModificationTime() const {
+  ULARGE_INTEGER UI;
+  UI.LowPart = LastWriteTimeLow;
+  UI.HighPart = LastWriteTimeHigh;
+
+  TimeValue Ret;
+  Ret.fromWin32Time(UI.QuadPart);
+  return Ret;
+}
+
+error_code current_path(SmallVectorImpl<char> &result) {
+  SmallVector<wchar_t, 128> cur_path;
+  cur_path.reserve(128);
+retry_cur_dir:
+  DWORD len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data());
+
+  // A zero return value indicates a failure other than insufficient space.
+  if (len == 0)
+    return windows_error(::GetLastError());
+
+  // If there's insufficient space, the len returned is larger than the len
+  // given.
+  if (len > cur_path.capacity()) {
+    cur_path.reserve(len);
+    goto retry_cur_dir;
+  }
+
+  cur_path.set_size(len);
+  // cur_path now holds the current directory in utf-16. Convert to utf-8.
+
+  // Find out how much space we need. Sadly, this function doesn't return the
+  // size needed unless you tell it the result size is 0, which means you
+  // _always_ have to call it twice.
+  len = ::WideCharToMultiByte(CP_UTF8, 0,
+                              cur_path.data(), cur_path.size(),
+                              result.data(), 0,
+                              NULL, NULL);
+
+  if (len == 0)
+    return make_error_code(windows_error(::GetLastError()));
+
+  result.reserve(len);
+  result.set_size(len);
+  // Now do the actual conversion.
+  len = ::WideCharToMultiByte(CP_UTF8, 0,
+                              cur_path.data(), cur_path.size(),
+                              result.data(), result.size(),
+                              NULL, NULL);
+  if (len == 0)
+    return windows_error(::GetLastError());
+
+  return error_code::success();
+}
+
+error_code copy_file(const Twine &from, const Twine &to, copy_option copt) {
+  // Get arguments.
+  SmallString<128> from_storage;
+  SmallString<128> to_storage;
+  StringRef f = from.toStringRef(from_storage);
+  StringRef t = to.toStringRef(to_storage);
+
+  // Convert to utf-16.
+  SmallVector<wchar_t, 128> wide_from;
+  SmallVector<wchar_t, 128> wide_to;
+  if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
+  if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
+
+  // Copy the file.
+  BOOL res = ::CopyFileW(wide_from.begin(), wide_to.begin(),
+                         copt != copy_option::overwrite_if_exists);
+
+  if (res == 0)
+    return windows_error(::GetLastError());
+
+  return error_code::success();
+}
+
+error_code create_directory(const Twine &path, bool &existed) {
+  SmallString<128> path_storage;
+  SmallVector<wchar_t, 128> path_utf16;
+
+  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
+                                  path_utf16))
+    return ec;
+
+  if (!::CreateDirectoryW(path_utf16.begin(), NULL)) {
+    error_code ec = windows_error(::GetLastError());
+    if (ec == windows_error::already_exists)
+      existed = true;
+    else
+      return ec;
+  } else
+    existed = false;
+
+  return error_code::success();
+}
+
+error_code create_hard_link(const Twine &to, const Twine &from) {
+  // Get arguments.
+  SmallString<128> from_storage;
+  SmallString<128> to_storage;
+  StringRef f = from.toStringRef(from_storage);
+  StringRef t = to.toStringRef(to_storage);
+
+  // Convert to utf-16.
+  SmallVector<wchar_t, 128> wide_from;
+  SmallVector<wchar_t, 128> wide_to;
+  if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
+  if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
+
+  if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL))
+    return windows_error(::GetLastError());
+
+  return error_code::success();
+}
+
+error_code create_symlink(const Twine &to, const Twine &from) {
+  // Only do it if the function is available at runtime.
+  if (!create_symbolic_link_api)
+    return make_error_code(errc::function_not_supported);
+
+  // Get arguments.
+  SmallString<128> from_storage;
+  SmallString<128> to_storage;
+  StringRef f = from.toStringRef(from_storage);
+  StringRef t = to.toStringRef(to_storage);
+
+  // Convert to utf-16.
+  SmallVector<wchar_t, 128> wide_from;
+  SmallVector<wchar_t, 128> wide_to;
+  if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
+  if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
+
+  if (!create_symbolic_link_api(wide_from.begin(), wide_to.begin(), 0))
+    return windows_error(::GetLastError());
+
+  return error_code::success();
+}
+
+error_code remove(const Twine &path, bool &existed) {
+  SmallString<128> path_storage;
+  SmallVector<wchar_t, 128> path_utf16;
+
+  file_status st;
+  if (error_code ec = status(path, st))
+    return ec;
+
+  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
+                                  path_utf16))
+    return ec;
+
+  if (st.type() == file_type::directory_file) {
+    if (!::RemoveDirectoryW(c_str(path_utf16))) {
+      error_code ec = windows_error(::GetLastError());
+      if (ec != windows_error::file_not_found)
+        return ec;
+      existed = false;
+    } else
+      existed = true;
+  } else {
+    if (!::DeleteFileW(c_str(path_utf16))) {
+      error_code ec = windows_error(::GetLastError());
+      if (ec != windows_error::file_not_found)
+        return ec;
+      existed = false;
+    } else
+      existed = true;
+  }
+
+  return error_code::success();
+}
+
+error_code rename(const Twine &from, const Twine &to) {
+  // Get arguments.
+  SmallString<128> from_storage;
+  SmallString<128> to_storage;
+  StringRef f = from.toStringRef(from_storage);
+  StringRef t = to.toStringRef(to_storage);
+
+  // Convert to utf-16.
+  SmallVector<wchar_t, 128> wide_from;
+  SmallVector<wchar_t, 128> wide_to;
+  if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
+  if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
+
+  error_code ec = error_code::success();
+  for (int i = 0; i < 2000; i++) {
+    if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
+                      MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
+      return error_code::success();
+    ec = windows_error(::GetLastError());
+    if (ec != windows_error::access_denied)
+      break;
+    // Retry MoveFile() at ACCESS_DENIED.
+    // System scanners (eg. indexer) might open the source file when
+    // It is written and closed.
+    ::Sleep(1);
+  }
+
+  return ec;
+}
+
+error_code resize_file(const Twine &path, uint64_t size) {
+  SmallString<128> path_storage;
+  SmallVector<wchar_t, 128> path_utf16;
+
+  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
+                                  path_utf16))
+    return ec;
+
+  int fd = ::_wopen(path_utf16.begin(), O_BINARY | _O_RDWR, S_IWRITE);
+  if (fd == -1)
+    return error_code(errno, generic_category());
+#ifdef HAVE__CHSIZE_S
+  errno_t error = ::_chsize_s(fd, size);
+#else
+  errno_t error = ::_chsize(fd, size);
+#endif
+  ::close(fd);
+  return error_code(error, generic_category());
+}
+
+error_code exists(const Twine &path, bool &result) {
+  SmallString<128> path_storage;
+  SmallVector<wchar_t, 128> path_utf16;
+
+  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
+                                  path_utf16))
+    return ec;
+
+  DWORD attributes = ::GetFileAttributesW(path_utf16.begin());
+
+  if (attributes == INVALID_FILE_ATTRIBUTES) {
+    // See if the file didn't actually exist.
+    error_code ec = make_error_code(windows_error(::GetLastError()));
+    if (ec != windows_error::file_not_found &&
+        ec != windows_error::path_not_found)
+      return ec;
+    result = false;
+  } else
+    result = true;
+  return error_code::success();
+}
+
+bool can_write(const Twine &Path) {
+  // FIXME: take security attributes into account.
+  SmallString<128> PathStorage;
+  SmallVector<wchar_t, 128> PathUtf16;
+
+  if (UTF8ToUTF16(Path.toStringRef(PathStorage), PathUtf16))
+    return false;
+
+  DWORD Attr = ::GetFileAttributesW(PathUtf16.begin());
+  return (Attr != INVALID_FILE_ATTRIBUTES) && !(Attr & FILE_ATTRIBUTE_READONLY);
+}
+
+bool can_execute(const Twine &Path) {
+  SmallString<128> PathStorage;
+  SmallVector<wchar_t, 128> PathUtf16;
+
+  if (UTF8ToUTF16(Path.toStringRef(PathStorage), PathUtf16))
+    return false;
+
+  DWORD Attr = ::GetFileAttributesW(PathUtf16.begin());
+  return Attr != INVALID_FILE_ATTRIBUTES;
+}
+
+bool equivalent(file_status A, file_status B) {
+  assert(status_known(A) && status_known(B));
+  return A.FileIndexHigh      == B.FileIndexHigh &&
+         A.FileIndexLow       == B.FileIndexLow &&
+         A.FileSizeHigh       == B.FileSizeHigh &&
+         A.FileSizeLow        == B.FileSizeLow &&
+         A.LastWriteTimeHigh  == B.LastWriteTimeHigh &&
+         A.LastWriteTimeLow   == B.LastWriteTimeLow &&
+         A.VolumeSerialNumber == B.VolumeSerialNumber;
+}
+
+error_code equivalent(const Twine &A, const Twine &B, bool &result) {
+  file_status fsA, fsB;
+  if (error_code ec = status(A, fsA)) return ec;
+  if (error_code ec = status(B, fsB)) return ec;
+  result = equivalent(fsA, fsB);
+  return error_code::success();
+}
+
+error_code file_size(const Twine &path, uint64_t &result) {
+  SmallString<128> path_storage;
+  SmallVector<wchar_t, 128> path_utf16;
+
+  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
+                                  path_utf16))
+    return ec;
+
+  WIN32_FILE_ATTRIBUTE_DATA FileData;
+  if (!::GetFileAttributesExW(path_utf16.begin(),
+                              ::GetFileExInfoStandard,
+                              &FileData))
+    return windows_error(::GetLastError());
+
+  result =
+    (uint64_t(FileData.nFileSizeHigh) << (sizeof(FileData.nFileSizeLow) * 8))
+    + FileData.nFileSizeLow;
+
+  return error_code::success();
+}
+
+error_code getUniqueID(const Twine Path, uint64_t &Result) {
+  file_status Status;
+  if (error_code E = status(Path, Status))
+    return E;
+
+  // The file is uniquely identified by the volume serial number along
+  // with the 64-bit file identifier.
+  Result = (static_cast<uint64_t>(Status.FileIndexHigh) << 32ULL) |
+           static_cast<uint64_t>(Status.FileIndexLow);
+  
+  // Because the serial number is 32-bits, but we've already used up all 64
+  // bits for the file index, XOR the serial number into the high 32 bits of
+  // the resulting value.  We could potentially get collisons from this, but
+  // the likelihood is low.
+  Result ^= (static_cast<uint64_t>(Status.VolumeSerialNumber) << 32ULL);
+
+  return error_code::success();
+}
+
+static bool isReservedName(StringRef path) {
+  // This list of reserved names comes from MSDN, at:
+  // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
+  static const char *sReservedNames[] = { "nul", "con", "prn", "aux",
+                              "com1", "com2", "com3", "com4", "com5", "com6",
+                              "com7", "com8", "com9", "lpt1", "lpt2", "lpt3",
+                              "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9" };
+
+  // First, check to see if this is a device namespace, which always
+  // starts with \\.\, since device namespaces are not legal file paths.
+  if (path.startswith("\\\\.\\"))
+    return true;
+
+  // Then compare against the list of ancient reserved names
+  for (size_t i = 0; i < sizeof(sReservedNames) / sizeof(const char *); ++i) {
+    if (path.equals_lower(sReservedNames[i]))
+      return true;
+  }
+
+  // The path isn't what we consider reserved.
+  return false;
+}
+
+error_code status(const Twine &path, file_status &result) {
+  SmallString<128> path_storage;
+  SmallVector<wchar_t, 128> path_utf16;
+
+  StringRef path8 = path.toStringRef(path_storage);
+  if (isReservedName(path8)) {
+    result = file_status(file_type::character_file);
+    return error_code::success();
+  }
+
+  if (error_code ec = UTF8ToUTF16(path8, path_utf16))
+    return ec;
+
+  DWORD attr = ::GetFileAttributesW(path_utf16.begin());
+  if (attr == INVALID_FILE_ATTRIBUTES)
+    goto handle_status_error;
+
+  // Handle reparse points.
+  if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
+    ScopedFileHandle h(
+      ::CreateFileW(path_utf16.begin(),
+                    0, // Attributes only.
+                    FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
+                    NULL,
+                    OPEN_EXISTING,
+                    FILE_FLAG_BACKUP_SEMANTICS,
+                    0));
+    if (!h)
+      goto handle_status_error;
+  }
+
+  if (attr & FILE_ATTRIBUTE_DIRECTORY)
+    result = file_status(file_type::directory_file);
+  else {
+    result = file_status(file_type::regular_file);
+    ScopedFileHandle h(
+      ::CreateFileW(path_utf16.begin(),
+                    0, // Attributes only.
+                    FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
+                    NULL,
+                    OPEN_EXISTING,
+                    FILE_FLAG_BACKUP_SEMANTICS,
+                    0));
+    if (!h)
+      goto handle_status_error;
+    BY_HANDLE_FILE_INFORMATION Info;
+    if (!::GetFileInformationByHandle(h, &Info))
+      goto handle_status_error;
+    result.FileIndexHigh      = Info.nFileIndexHigh;
+    result.FileIndexLow       = Info.nFileIndexLow;
+    result.FileSizeHigh       = Info.nFileSizeHigh;
+    result.FileSizeLow        = Info.nFileSizeLow;
+    result.LastWriteTimeHigh  = Info.ftLastWriteTime.dwHighDateTime;
+    result.LastWriteTimeLow   = Info.ftLastWriteTime.dwLowDateTime;
+    result.VolumeSerialNumber = Info.dwVolumeSerialNumber;
+  }
+
+  return error_code::success();
+
+handle_status_error:
+  error_code ec = windows_error(::GetLastError());
+  if (ec == windows_error::file_not_found ||
+      ec == windows_error::path_not_found)
+    result = file_status(file_type::file_not_found);
+  else if (ec == windows_error::sharing_violation)
+    result = file_status(file_type::type_unknown);
+  else {
+    result = file_status(file_type::status_error);
+    return ec;
+  }
+
+  return error_code::success();
+}
+
+
+// Modifies permissions on a file.
+error_code permissions(const Twine &path, perms prms) {
+#if 0 // verify code below before enabling:
+  // If the permissions bits are not trying to modify
+  // "write" permissions, there is nothing to do.
+  if (!(prms & (owner_write|group_write|others_write)))
+    return error_code::success();
+  
+  SmallString<128> path_storage;
+  SmallVector<wchar_t, 128> path_utf16;
+
+  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
+                                  path_utf16))
+    return ec;
+
+  DWORD attributes = ::GetFileAttributesW(path_utf16.begin());
+
+  if (prms & add_perms) {
+    attributes &= ~FILE_ATTRIBUTE_READONLY;
+  }
+  else if (prms & remove_perms) {
+    attributes |= FILE_ATTRIBUTE_READONLY;
+  }
+  else {
+    assert(0 && "neither add_perms or remove_perms is set");
+  }
+
+  if ( ! ::SetFileAttributesW(path_utf16.begin(), attributes))
+    return windows_error(::GetLastError());
+#endif    
+  return error_code::success();
+}
+
+error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
+  ULARGE_INTEGER UI;
+  UI.QuadPart = Time.toWin32Time();
+  FILETIME FT;
+  FT.dwLowDateTime = UI.LowPart;
+  FT.dwHighDateTime = UI.HighPart;
+  HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
+  if (!SetFileTime(FileHandle, NULL, &FT, &FT))
+    return windows_error(::GetLastError());
+  return error_code::success();
+}
+
+// FIXME: mode should be used here and default to user r/w only,
+// it currently comes in as a UNIX mode.
+error_code unique_file(const Twine &model, int &result_fd,
+                       SmallVectorImpl<char> &result_path,
+                       bool makeAbsolute, unsigned mode) {
+  // Use result_path as temp storage.
+  result_path.set_size(0);
+  StringRef m = model.toStringRef(result_path);
+
+  SmallVector<wchar_t, 128> model_utf16;
+  if (error_code ec = UTF8ToUTF16(m, model_utf16)) return ec;
+
+  if (makeAbsolute) {
+    // Make model absolute by prepending a temp directory if it's not already.
+    bool absolute = path::is_absolute(m);
+
+    if (!absolute) {
+      SmallVector<wchar_t, 64> temp_dir;
+      if (error_code ec = TempDir(temp_dir)) return ec;
+      // Handle c: by removing it.
+      if (model_utf16.size() > 2 && model_utf16[1] == L':') {
+        model_utf16.erase(model_utf16.begin(), model_utf16.begin() + 2);
+      }
+      model_utf16.insert(model_utf16.begin(), temp_dir.begin(), temp_dir.end());
+    }
+  }
+
+  // Replace '%' with random chars. From here on, DO NOT modify model. It may be
+  // needed if the randomly chosen path already exists.
+  SmallVector<wchar_t, 128> random_path_utf16;
+
+  // Get a Crypto Provider for CryptGenRandom.
+  HCRYPTPROV HCPC;
+  if (!::CryptAcquireContextW(&HCPC,
+                              NULL,
+                              NULL,
+                              PROV_RSA_FULL,
+                              CRYPT_VERIFYCONTEXT))
+    return windows_error(::GetLastError());
+  ScopedCryptContext CryptoProvider(HCPC);
+
+retry_random_path:
+  random_path_utf16.set_size(0);
+  for (SmallVectorImpl<wchar_t>::const_iterator i = model_utf16.begin(),
+                                                e = model_utf16.end();
+                                                i != e; ++i) {
+    if (*i == L'%') {
+      BYTE val = 0;
+      if (!::CryptGenRandom(CryptoProvider, 1, &val))
+          return windows_error(::GetLastError());
+      random_path_utf16.push_back("0123456789abcdef"[val & 15]);
+    }
+    else
+      random_path_utf16.push_back(*i);
+  }
+  // Make random_path_utf16 null terminated.
+  random_path_utf16.push_back(0);
+  random_path_utf16.pop_back();
+
+  // Make sure we don't fall into an infinite loop by constantly trying
+  // to create the parent path.
+  bool TriedToCreateParent = false;
+
+  // Try to create + open the path.
+retry_create_file:
+  HANDLE TempFileHandle = ::CreateFileW(random_path_utf16.begin(),
+                                        GENERIC_READ | GENERIC_WRITE,
+                                        FILE_SHARE_READ,
+                                        NULL,
+                                        // Return ERROR_FILE_EXISTS if the file
+                                        // already exists.
+                                        CREATE_NEW,
+                                        FILE_ATTRIBUTE_TEMPORARY,
+                                        NULL);
+  if (TempFileHandle == INVALID_HANDLE_VALUE) {
+    // If the file existed, try again, otherwise, error.
+    error_code ec = windows_error(::GetLastError());
+    if (ec == windows_error::file_exists)
+      goto retry_random_path;
+    // Check for non-existing parent directories.
+    if (ec == windows_error::path_not_found && !TriedToCreateParent) {
+      TriedToCreateParent = true;
+
+      // Create the directories using result_path as temp storage.
+      if (error_code ec = UTF16ToUTF8(random_path_utf16.begin(),
+                                      random_path_utf16.size(), result_path))
+        return ec;
+      StringRef p(result_path.begin(), result_path.size());
+      SmallString<64> dir_to_create;
+      for (path::const_iterator i = path::begin(p),
+                                e = --path::end(p); i != e; ++i) {
+        path::append(dir_to_create, *i);
+        bool Exists;
+        if (error_code ec = exists(Twine(dir_to_create), Exists)) return ec;
+        if (!Exists) {
+          // If c: doesn't exist, bail.
+          if (i->endswith(":"))
+            return ec;
+
+          SmallVector<wchar_t, 64> dir_to_create_utf16;
+          if (error_code ec = UTF8ToUTF16(dir_to_create, dir_to_create_utf16))
+            return ec;
+
+          // Create the directory.
+          if (!::CreateDirectoryW(dir_to_create_utf16.begin(), NULL))
+            return windows_error(::GetLastError());
+        }
+      }
+      goto retry_create_file;
+    }
+    return ec;
+  }
+
+  // Set result_path to the utf-8 representation of the path.
+  if (error_code ec = UTF16ToUTF8(random_path_utf16.begin(),
+                                  random_path_utf16.size(), result_path)) {
+    ::CloseHandle(TempFileHandle);
+    ::DeleteFileW(random_path_utf16.begin());
+    return ec;
+  }
+
+  // Convert the Windows API file handle into a C-runtime handle.
+  int fd = ::_open_osfhandle(intptr_t(TempFileHandle), 0);
+  if (fd == -1) {
+    ::CloseHandle(TempFileHandle);
+    ::DeleteFileW(random_path_utf16.begin());
+    // MSDN doesn't say anything about _open_osfhandle setting errno or
+    // GetLastError(), so just return invalid_handle.
+    return windows_error::invalid_handle;
+  }
+
+  result_fd = fd;
+  return error_code::success();
+}
+
+error_code get_magic(const Twine &path, uint32_t len,
+                     SmallVectorImpl<char> &result) {
+  SmallString<128> path_storage;
+  SmallVector<wchar_t, 128> path_utf16;
+  result.set_size(0);
+
+  // Convert path to UTF-16.
+  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
+                                  path_utf16))
+    return ec;
+
+  // Open file.
+  HANDLE file = ::CreateFileW(c_str(path_utf16),
+                              GENERIC_READ,
+                              FILE_SHARE_READ,
+                              NULL,
+                              OPEN_EXISTING,
+                              FILE_ATTRIBUTE_READONLY,
+                              NULL);
+  if (file == INVALID_HANDLE_VALUE)
+    return windows_error(::GetLastError());
+
+  // Allocate buffer.
+  result.reserve(len);
+
+  // Get magic!
+  DWORD bytes_read = 0;
+  BOOL read_success = ::ReadFile(file, result.data(), len, &bytes_read, NULL);
+  error_code ec = windows_error(::GetLastError());
+  ::CloseHandle(file);
+  if (!read_success || (bytes_read != len)) {
+    // Set result size to the number of bytes read if it's valid.
+    if (bytes_read <= len)
+      result.set_size(bytes_read);
+    // ERROR_HANDLE_EOF is mapped to errc::value_too_large.
+    return ec;
+  }
+
+  result.set_size(len);
+  return error_code::success();
+}
+
+error_code mapped_file_region::init(int FD, bool CloseFD, uint64_t Offset) {
+  FileDescriptor = FD;
+  // Make sure that the requested size fits within SIZE_T.
+  if (Size > std::numeric_limits<SIZE_T>::max()) {
+    if (FileDescriptor) {
+      if (CloseFD)
+        _close(FileDescriptor);
+    } else
+      ::CloseHandle(FileHandle);
+    return make_error_code(errc::invalid_argument);
+  }
+
+  DWORD flprotect;
+  switch (Mode) {
+  case readonly:  flprotect = PAGE_READONLY; break;
+  case readwrite: flprotect = PAGE_READWRITE; break;
+  case priv:      flprotect = PAGE_WRITECOPY; break;
+  default: llvm_unreachable("invalid mapping mode");
+  }
+
+  FileMappingHandle = ::CreateFileMapping(FileHandle,
+                                          0,
+                                          flprotect,
+                                          Size >> 32,
+                                          Size & 0xffffffff,
+                                          0);
+  if (FileMappingHandle == NULL) {
+    error_code ec = windows_error(GetLastError());
+    if (FileDescriptor) {
+      if (CloseFD)
+        _close(FileDescriptor);
+    } else
+      ::CloseHandle(FileHandle);
+    return ec;
+  }
+
+  DWORD dwDesiredAccess;
+  switch (Mode) {
+  case readonly:  dwDesiredAccess = FILE_MAP_READ; break;
+  case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break;
+  case priv:      dwDesiredAccess = FILE_MAP_COPY; break;
+  default: llvm_unreachable("invalid mapping mode");
+  }
+  Mapping = ::MapViewOfFile(FileMappingHandle,
+                            dwDesiredAccess,
+                            Offset >> 32,
+                            Offset & 0xffffffff,
+                            Size);
+  if (Mapping == NULL) {
+    error_code ec = windows_error(GetLastError());
+    ::CloseHandle(FileMappingHandle);
+    if (FileDescriptor) {
+      if (CloseFD)
+        _close(FileDescriptor);
+    } else
+      ::CloseHandle(FileHandle);
+    return ec;
+  }
+
+  if (Size == 0) {
+    MEMORY_BASIC_INFORMATION mbi;
+    SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
+    if (Result == 0) {
+      error_code ec = windows_error(GetLastError());
+      ::UnmapViewOfFile(Mapping);
+      ::CloseHandle(FileMappingHandle);
+      if (FileDescriptor) {
+        if (CloseFD)
+          _close(FileDescriptor);
+      } else
+        ::CloseHandle(FileHandle);
+      return ec;
+    }
+    Size = mbi.RegionSize;
+  }
+
+  // Close all the handles except for the view. It will keep the other handles
+  // alive.
+  ::CloseHandle(FileMappingHandle);
+  if (FileDescriptor) {
+    if (CloseFD)
+      _close(FileDescriptor); // Also closes FileHandle.
+  } else
+    ::CloseHandle(FileHandle);
+  return error_code::success();
+}
+
+mapped_file_region::mapped_file_region(const Twine &path,
+                                       mapmode mode,
+                                       uint64_t length,
+                                       uint64_t offset,
+                                       error_code &ec) 
+  : Mode(mode)
+  , Size(length)
+  , Mapping()
+  , FileDescriptor()
+  , FileHandle(INVALID_HANDLE_VALUE)
+  , FileMappingHandle() {
+  SmallString<128> path_storage;
+  SmallVector<wchar_t, 128> path_utf16;
+
+  // Convert path to UTF-16.
+  if ((ec = UTF8ToUTF16(path.toStringRef(path_storage), path_utf16)))
+    return;
+
+  // Get file handle for creating a file mapping.
+  FileHandle = ::CreateFileW(c_str(path_utf16),
+                             Mode == readonly ? GENERIC_READ
+                                              : GENERIC_READ | GENERIC_WRITE,
+                             Mode == readonly ? FILE_SHARE_READ
+                                              : 0,
+                             0,
+                             Mode == readonly ? OPEN_EXISTING
+                                              : OPEN_ALWAYS,
+                             Mode == readonly ? FILE_ATTRIBUTE_READONLY
+                                              : FILE_ATTRIBUTE_NORMAL,
+                             0);
+  if (FileHandle == INVALID_HANDLE_VALUE) {
+    ec = windows_error(::GetLastError());
+    return;
+  }
+
+  FileDescriptor = 0;
+  ec = init(FileDescriptor, true, offset);
+  if (ec) {
+    Mapping = FileMappingHandle = 0;
+    FileHandle = INVALID_HANDLE_VALUE;
+    FileDescriptor = 0;
+  }
+}
+
+mapped_file_region::mapped_file_region(int fd,
+                                       bool closefd,
+                                       mapmode mode,
+                                       uint64_t length,
+                                       uint64_t offset,
+                                       error_code &ec)
+  : Mode(mode)
+  , Size(length)
+  , Mapping()
+  , FileDescriptor(fd)
+  , FileHandle(INVALID_HANDLE_VALUE)
+  , FileMappingHandle() {
+  FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(fd));
+  if (FileHandle == INVALID_HANDLE_VALUE) {
+    if (closefd)
+      _close(FileDescriptor);
+    FileDescriptor = 0;
+    ec = make_error_code(errc::bad_file_descriptor);
+    return;
+  }
+
+  ec = init(FileDescriptor, closefd, offset);
+  if (ec) {
+    Mapping = FileMappingHandle = 0;
+    FileHandle = INVALID_HANDLE_VALUE;
+    FileDescriptor = 0;
+  }
+}
+
+mapped_file_region::~mapped_file_region() {
+  if (Mapping)
+    ::UnmapViewOfFile(Mapping);
+}
+
+#if LLVM_HAS_RVALUE_REFERENCES
+mapped_file_region::mapped_file_region(mapped_file_region &&other)
+  : Mode(other.Mode)
+  , Size(other.Size)
+  , Mapping(other.Mapping)
+  , FileDescriptor(other.FileDescriptor)
+  , FileHandle(other.FileHandle)
+  , FileMappingHandle(other.FileMappingHandle) {
+  other.Mapping = other.FileMappingHandle = 0;
+  other.FileHandle = INVALID_HANDLE_VALUE;
+  other.FileDescriptor = 0;
+}
+#endif
+
+mapped_file_region::mapmode mapped_file_region::flags() const {
+  assert(Mapping && "Mapping failed but used anyway!");
+  return Mode;
+}
+
+uint64_t mapped_file_region::size() const {
+  assert(Mapping && "Mapping failed but used anyway!");
+  return Size;
+}
+
+char *mapped_file_region::data() const {
+  assert(Mode != readonly && "Cannot get non const data for readonly mapping!");
+  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() {
+  SYSTEM_INFO SysInfo;
+  ::GetSystemInfo(&SysInfo);
+  return SysInfo.dwAllocationGranularity;
+}
+
+error_code detail::directory_iterator_construct(detail::DirIterState &it,
+                                                StringRef path){
+  SmallVector<wchar_t, 128> path_utf16;
+
+  if (error_code ec = UTF8ToUTF16(path,
+                                  path_utf16))
+    return ec;
+
+  // Convert path to the format that Windows is happy with.
+  if (path_utf16.size() > 0 &&
+      !is_separator(path_utf16[path.size() - 1]) &&
+      path_utf16[path.size() - 1] != L':') {
+    path_utf16.push_back(L'\\');
+    path_utf16.push_back(L'*');
+  } else {
+    path_utf16.push_back(L'*');
+  }
+
+  //  Get the first directory entry.
+  WIN32_FIND_DATAW FirstFind;
+  ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
+  if (!FindHandle)
+    return windows_error(::GetLastError());
+
+  size_t FilenameLen = ::wcslen(FirstFind.cFileName);
+  while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
+         (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
+                              FirstFind.cFileName[1] == L'.'))
+    if (!::FindNextFileW(FindHandle, &FirstFind)) {
+      error_code ec = windows_error(::GetLastError());
+      // Check for end.
+      if (ec == windows_error::no_more_files)
+        return detail::directory_iterator_destruct(it);
+      return ec;
+    } else
+      FilenameLen = ::wcslen(FirstFind.cFileName);
+
+  // Construct the current directory entry.
+  SmallString<128> directory_entry_name_utf8;
+  if (error_code ec = UTF16ToUTF8(FirstFind.cFileName,
+                                  ::wcslen(FirstFind.cFileName),
+                                  directory_entry_name_utf8))
+    return ec;
+
+  it.IterationHandle = intptr_t(FindHandle.take());
+  SmallString<128> directory_entry_path(path);
+  path::append(directory_entry_path, directory_entry_name_utf8.str());
+  it.CurrentEntry = directory_entry(directory_entry_path.str());
+
+  return error_code::success();
+}
+
+error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
+  if (it.IterationHandle != 0)
+    // Closes the handle if it's valid.
+    ScopedFindHandle close(HANDLE(it.IterationHandle));
+  it.IterationHandle = 0;
+  it.CurrentEntry = directory_entry();
+  return error_code::success();
+}
+
+error_code detail::directory_iterator_increment(detail::DirIterState &it) {
+  WIN32_FIND_DATAW FindData;
+  if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
+    error_code ec = windows_error(::GetLastError());
+    // Check for end.
+    if (ec == windows_error::no_more_files)
+      return detail::directory_iterator_destruct(it);
+    return ec;
+  }
+
+  size_t FilenameLen = ::wcslen(FindData.cFileName);
+  if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
+      (FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
+                           FindData.cFileName[1] == L'.'))
+    return directory_iterator_increment(it);
+
+  SmallString<128> directory_entry_path_utf8;
+  if (error_code ec = UTF16ToUTF8(FindData.cFileName,
+                                  ::wcslen(FindData.cFileName),
+                                  directory_entry_path_utf8))
+    return ec;
+
+  it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
+  return error_code::success();
+}
+
+error_code map_file_pages(const Twine &path, off_t file_offset, size_t size,  
+                                            bool map_writable, void *&result) {
+  assert(0 && "NOT IMPLEMENTED");
+  return windows_error::invalid_function;
+}
+
+error_code unmap_file_pages(void *base, size_t size) {
+  assert(0 && "NOT IMPLEMENTED");
+  return windows_error::invalid_function;
+}
+
+
+
+} // end namespace fs
+} // end namespace sys
+} // end namespace llvm