Restoring authorship annotation for <orivej@yandex-team.ru>. Commit 2 of 2.

1 files changed, 1267 insertions, 1267 deletions

diff --git a/contrib/libs/llvm12/lib/Support/Path.cpp b/contrib/libs/llvm12/lib/Support/Path.cpp
index 99202b5034..ef223ae5ac 100644
--- a/contrib/libs/llvm12/lib/Support/Path.cpp
+++ b/contrib/libs/llvm12/lib/Support/Path.cpp
@@ -1,682 +1,682 @@
-//===-- Path.cpp - Implement OS Path Concept ------------------------------===// 
-// 
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 
-// See https://llvm.org/LICENSE.txt for license information. 
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 
-// 
-//===----------------------------------------------------------------------===// 
-// 
-//  This file implements the operating system Path API. 
-// 
-//===----------------------------------------------------------------------===// 
- 
-#include "llvm/Support/Path.h" 
-#include "llvm/ADT/ArrayRef.h" 
-#include "llvm/Config/llvm-config.h" 
-#include "llvm/Support/Endian.h" 
-#include "llvm/Support/Errc.h" 
-#include "llvm/Support/ErrorHandling.h" 
-#include "llvm/Support/FileSystem.h" 
-#include "llvm/Support/Process.h" 
-#include "llvm/Support/Signals.h" 
-#include <cctype> 
-#include <cstring> 
- 
-#if !defined(_MSC_VER) && !defined(__MINGW32__) 
-#include <unistd.h> 
-#else 
-#include <io.h> 
-#endif 
- 
-using namespace llvm; 
-using namespace llvm::support::endian; 
- 
-namespace { 
-  using llvm::StringRef; 
-  using llvm::sys::path::is_separator; 
-  using llvm::sys::path::Style; 
- 
-  inline Style real_style(Style style) { 
-#ifdef _WIN32 
-    return (style == Style::posix) ? Style::posix : Style::windows; 
-#else 
-    return (style == Style::windows) ? Style::windows : Style::posix; 
-#endif 
-  } 
- 
-  inline const char *separators(Style style) { 
-    if (real_style(style) == Style::windows) 
-      return "\\/"; 
-    return "/"; 
-  } 
- 
-  inline char preferred_separator(Style style) { 
-    if (real_style(style) == Style::windows) 
-      return '\\'; 
-    return '/'; 
-  } 
- 
-  StringRef find_first_component(StringRef path, Style style) { 
-    // Look for this first component in the following order. 
-    // * empty (in this case we return an empty string) 
-    // * either C: or {//,\\}net. 
-    // * {/,\} 
-    // * {file,directory}name 
- 
-    if (path.empty()) 
-      return path; 
- 
-    if (real_style(style) == Style::windows) { 
-      // C: 
-      if (path.size() >= 2 && 
-          std::isalpha(static_cast<unsigned char>(path[0])) && path[1] == ':') 
-        return path.substr(0, 2); 
-    } 
- 
-    // //net 
-    if ((path.size() > 2) && is_separator(path[0], style) && 
-        path[0] == path[1] && !is_separator(path[2], style)) { 
-      // Find the next directory separator. 
-      size_t end = path.find_first_of(separators(style), 2); 
-      return path.substr(0, end); 
-    } 
- 
-    // {/,\} 
-    if (is_separator(path[0], style)) 
-      return path.substr(0, 1); 
- 
-    // * {file,directory}name 
-    size_t end = path.find_first_of(separators(style)); 
-    return path.substr(0, end); 
-  } 
- 
-  // Returns the first character of the filename in str. For paths ending in 
-  // '/', it returns the position of the '/'. 
-  size_t filename_pos(StringRef str, Style style) { 
-    if (str.size() > 0 && is_separator(str[str.size() - 1], style)) 
-      return str.size() - 1; 
- 
-    size_t pos = str.find_last_of(separators(style), str.size() - 1); 
- 
-    if (real_style(style) == Style::windows) { 
-      if (pos == StringRef::npos) 
-        pos = str.find_last_of(':', str.size() - 2); 
-    } 
- 
-    if (pos == StringRef::npos || (pos == 1 && is_separator(str[0], style))) 
-      return 0; 
- 
-    return pos + 1; 
-  } 
- 
-  // Returns the position of the root directory in str. If there is no root 
-  // directory in str, it returns StringRef::npos. 
-  size_t root_dir_start(StringRef str, Style style) { 
-    // case "c:/" 
-    if (real_style(style) == Style::windows) { 
-      if (str.size() > 2 && str[1] == ':' && is_separator(str[2], style)) 
-        return 2; 
-    } 
- 
-    // case "//net" 
-    if (str.size() > 3 && is_separator(str[0], style) && str[0] == str[1] && 
-        !is_separator(str[2], style)) { 
-      return str.find_first_of(separators(style), 2); 
-    } 
- 
-    // case "/" 
-    if (str.size() > 0 && is_separator(str[0], style)) 
-      return 0; 
- 
-    return StringRef::npos; 
-  } 
- 
-  // Returns the position past the end of the "parent path" of path. The parent 
-  // path will not end in '/', unless the parent is the root directory. If the 
-  // path has no parent, 0 is returned. 
-  size_t parent_path_end(StringRef path, Style style) { 
-    size_t end_pos = filename_pos(path, style); 
- 
-    bool filename_was_sep = 
-        path.size() > 0 && is_separator(path[end_pos], style); 
- 
-    // Skip separators until we reach root dir (or the start of the string). 
-    size_t root_dir_pos = root_dir_start(path, style); 
-    while (end_pos > 0 && 
-           (root_dir_pos == StringRef::npos || end_pos > root_dir_pos) && 
-           is_separator(path[end_pos - 1], style)) 
-      --end_pos; 
- 
-    if (end_pos == root_dir_pos && !filename_was_sep) { 
-      // We've reached the root dir and the input path was *not* ending in a 
-      // sequence of slashes. Include the root dir in the parent path. 
-      return root_dir_pos + 1; 
-    } 
- 
-    // Otherwise, just include before the last slash. 
-    return end_pos; 
-  } 
-} // end unnamed namespace 
- 
-enum FSEntity { 
-  FS_Dir, 
-  FS_File, 
-  FS_Name 
-}; 
- 
-static std::error_code 
-createUniqueEntity(const Twine &Model, int &ResultFD, 
-                   SmallVectorImpl<char> &ResultPath, bool MakeAbsolute, 
-                   unsigned Mode, FSEntity Type, 
-                   sys::fs::OpenFlags Flags = sys::fs::OF_None) { 
- 
-  // Limit the number of attempts we make, so that we don't infinite loop. E.g. 
-  // "permission denied" could be for a specific file (so we retry with a 
-  // different name) or for the whole directory (retry would always fail). 
-  // Checking which is racy, so we try a number of times, then give up. 
-  std::error_code EC; 
-  for (int Retries = 128; Retries > 0; --Retries) { 
-    sys::fs::createUniquePath(Model, ResultPath, MakeAbsolute); 
-    // Try to open + create the file. 
-    switch (Type) { 
-    case FS_File: { 
-      EC = sys::fs::openFileForReadWrite(Twine(ResultPath.begin()), ResultFD, 
-                                         sys::fs::CD_CreateNew, Flags, Mode); 
-      if (EC) { 
-        // errc::permission_denied happens on Windows when we try to open a file 
-        // that has been marked for deletion. 
-        if (EC == errc::file_exists || EC == errc::permission_denied) 
-          continue; 
-        return EC; 
-      } 
- 
-      return std::error_code(); 
-    } 
- 
-    case FS_Name: { 
-      EC = sys::fs::access(ResultPath.begin(), sys::fs::AccessMode::Exist); 
-      if (EC == errc::no_such_file_or_directory) 
-        return std::error_code(); 
-      if (EC) 
-        return EC; 
-      continue; 
-    } 
- 
-    case FS_Dir: { 
-      EC = sys::fs::create_directory(ResultPath.begin(), false); 
-      if (EC) { 
-        if (EC == errc::file_exists) 
-          continue; 
-        return EC; 
-      } 
-      return std::error_code(); 
-    } 
-    } 
-    llvm_unreachable("Invalid Type"); 
-  } 
-  return EC; 
-} 
- 
-namespace llvm { 
-namespace sys  { 
-namespace path { 
- 
-const_iterator begin(StringRef path, Style style) { 
-  const_iterator i; 
-  i.Path      = path; 
-  i.Component = find_first_component(path, style); 
-  i.Position  = 0; 
-  i.S = style; 
-  return i; 
-} 
- 
-const_iterator end(StringRef path) { 
-  const_iterator i; 
-  i.Path      = path; 
-  i.Position  = path.size(); 
-  return i; 
-} 
- 
-const_iterator &const_iterator::operator++() { 
-  assert(Position < Path.size() && "Tried to increment past end!"); 
- 
-  // Increment Position to past the current component 
-  Position += Component.size(); 
- 
-  // Check for end. 
-  if (Position == Path.size()) { 
-    Component = StringRef(); 
-    return *this; 
-  } 
- 
-  // Both POSIX and Windows treat paths that begin with exactly two separators 
-  // specially. 
-  bool was_net = Component.size() > 2 && is_separator(Component[0], S) && 
-                 Component[1] == Component[0] && !is_separator(Component[2], S); 
- 
-  // Handle separators. 
-  if (is_separator(Path[Position], S)) { 
-    // Root dir. 
-    if (was_net || 
-        // c:/ 
-        (real_style(S) == Style::windows && Component.endswith(":"))) { 
-      Component = Path.substr(Position, 1); 
-      return *this; 
-    } 
- 
-    // Skip extra separators. 
-    while (Position != Path.size() && is_separator(Path[Position], S)) { 
-      ++Position; 
-    } 
- 
-    // Treat trailing '/' as a '.', unless it is the root dir. 
-    if (Position == Path.size() && Component != "/") { 
-      --Position; 
-      Component = "."; 
-      return *this; 
-    } 
-  } 
- 
-  // Find next component. 
-  size_t end_pos = Path.find_first_of(separators(S), Position); 
-  Component = Path.slice(Position, end_pos); 
- 
-  return *this; 
-} 
- 
-bool const_iterator::operator==(const const_iterator &RHS) const { 
-  return Path.begin() == RHS.Path.begin() && Position == RHS.Position; 
-} 
- 
-ptrdiff_t const_iterator::operator-(const const_iterator &RHS) const { 
-  return Position - RHS.Position; 
-} 
- 
-reverse_iterator rbegin(StringRef Path, Style style) { 
-  reverse_iterator I; 
-  I.Path = Path; 
-  I.Position = Path.size(); 
-  I.S = style; 
-  ++I; 
-  return I; 
-} 
- 
-reverse_iterator rend(StringRef Path) { 
-  reverse_iterator I; 
-  I.Path = Path; 
-  I.Component = Path.substr(0, 0); 
-  I.Position = 0; 
-  return I; 
-} 
- 
-reverse_iterator &reverse_iterator::operator++() { 
-  size_t root_dir_pos = root_dir_start(Path, S); 
- 
-  // Skip separators unless it's the root directory. 
-  size_t end_pos = Position; 
-  while (end_pos > 0 && (end_pos - 1) != root_dir_pos && 
-         is_separator(Path[end_pos - 1], S)) 
-    --end_pos; 
- 
-  // Treat trailing '/' as a '.', unless it is the root dir. 
-  if (Position == Path.size() && !Path.empty() && 
-      is_separator(Path.back(), S) && 
-      (root_dir_pos == StringRef::npos || end_pos - 1 > root_dir_pos)) { 
-    --Position; 
-    Component = "."; 
-    return *this; 
-  } 
- 
-  // Find next separator. 
-  size_t start_pos = filename_pos(Path.substr(0, end_pos), S); 
-  Component = Path.slice(start_pos, end_pos); 
-  Position = start_pos; 
-  return *this; 
-} 
- 
-bool reverse_iterator::operator==(const reverse_iterator &RHS) const { 
-  return Path.begin() == RHS.Path.begin() && Component == RHS.Component && 
-         Position == RHS.Position; 
-} 
- 
-ptrdiff_t reverse_iterator::operator-(const reverse_iterator &RHS) const { 
-  return Position - RHS.Position; 
-} 
- 
-StringRef root_path(StringRef path, Style style) { 
-  const_iterator b = begin(path, style), pos = b, e = end(path); 
-  if (b != e) { 
-    bool has_net = 
-        b->size() > 2 && is_separator((*b)[0], style) && (*b)[1] == (*b)[0]; 
-    bool has_drive = (real_style(style) == Style::windows) && b->endswith(":"); 
- 
-    if (has_net || has_drive) { 
-      if ((++pos != e) && is_separator((*pos)[0], style)) { 
-        // {C:/,//net/}, so get the first two components. 
-        return path.substr(0, b->size() + pos->size()); 
-      } 
+//===-- Path.cpp - Implement OS Path Concept ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file implements the operating system Path API.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Path.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/Config/llvm-config.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/Signals.h"
+#include <cctype>
+#include <cstring>
+
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
+#include <unistd.h>
+#else
+#include <io.h>
+#endif
+
+using namespace llvm;
+using namespace llvm::support::endian;
+
+namespace {
+  using llvm::StringRef;
+  using llvm::sys::path::is_separator;
+  using llvm::sys::path::Style;
+
+  inline Style real_style(Style style) {
+#ifdef _WIN32
+    return (style == Style::posix) ? Style::posix : Style::windows;
+#else
+    return (style == Style::windows) ? Style::windows : Style::posix;
+#endif
+  }
+
+  inline const char *separators(Style style) {
+    if (real_style(style) == Style::windows)
+      return "\\/";
+    return "/";
+  }
+
+  inline char preferred_separator(Style style) {
+    if (real_style(style) == Style::windows)
+      return '\\';
+    return '/';
+  }
+
+  StringRef find_first_component(StringRef path, Style style) {
+    // Look for this first component in the following order.
+    // * empty (in this case we return an empty string)
+    // * either C: or {//,\\}net.
+    // * {/,\}
+    // * {file,directory}name
+
+    if (path.empty())
+      return path;
+
+    if (real_style(style) == Style::windows) {
+      // C:
+      if (path.size() >= 2 &&
+          std::isalpha(static_cast<unsigned char>(path[0])) && path[1] == ':')
+        return path.substr(0, 2);
+    }
+
+    // //net
+    if ((path.size() > 2) && is_separator(path[0], style) &&
+        path[0] == path[1] && !is_separator(path[2], style)) {
+      // Find the next directory separator.
+      size_t end = path.find_first_of(separators(style), 2);
+      return path.substr(0, end);
+    }
+
+    // {/,\}
+    if (is_separator(path[0], style))
+      return path.substr(0, 1);
+
+    // * {file,directory}name
+    size_t end = path.find_first_of(separators(style));
+    return path.substr(0, end);
+  }
+
+  // Returns the first character of the filename in str. For paths ending in
+  // '/', it returns the position of the '/'.
+  size_t filename_pos(StringRef str, Style style) {
+    if (str.size() > 0 && is_separator(str[str.size() - 1], style))
+      return str.size() - 1;
+
+    size_t pos = str.find_last_of(separators(style), str.size() - 1);
+
+    if (real_style(style) == Style::windows) {
+      if (pos == StringRef::npos)
+        pos = str.find_last_of(':', str.size() - 2);
+    }
+
+    if (pos == StringRef::npos || (pos == 1 && is_separator(str[0], style)))
+      return 0;
+
+    return pos + 1;
+  }
+
+  // Returns the position of the root directory in str. If there is no root
+  // directory in str, it returns StringRef::npos.
+  size_t root_dir_start(StringRef str, Style style) {
+    // case "c:/"
+    if (real_style(style) == Style::windows) {
+      if (str.size() > 2 && str[1] == ':' && is_separator(str[2], style))
+        return 2;
+    }
+
+    // case "//net"
+    if (str.size() > 3 && is_separator(str[0], style) && str[0] == str[1] &&
+        !is_separator(str[2], style)) {
+      return str.find_first_of(separators(style), 2);
+    }
+
+    // case "/"
+    if (str.size() > 0 && is_separator(str[0], style))
+      return 0;
+
+    return StringRef::npos;
+  }
+
+  // Returns the position past the end of the "parent path" of path. The parent
+  // path will not end in '/', unless the parent is the root directory. If the
+  // path has no parent, 0 is returned.
+  size_t parent_path_end(StringRef path, Style style) {
+    size_t end_pos = filename_pos(path, style);
+
+    bool filename_was_sep =
+        path.size() > 0 && is_separator(path[end_pos], style);
+
+    // Skip separators until we reach root dir (or the start of the string).
+    size_t root_dir_pos = root_dir_start(path, style);
+    while (end_pos > 0 &&
+           (root_dir_pos == StringRef::npos || end_pos > root_dir_pos) &&
+           is_separator(path[end_pos - 1], style))
+      --end_pos;
+
+    if (end_pos == root_dir_pos && !filename_was_sep) {
+      // We've reached the root dir and the input path was *not* ending in a
+      // sequence of slashes. Include the root dir in the parent path.
+      return root_dir_pos + 1;
+    }
+
+    // Otherwise, just include before the last slash.
+    return end_pos;
+  }
+} // end unnamed namespace
+
+enum FSEntity {
+  FS_Dir,
+  FS_File,
+  FS_Name
+};
+
+static std::error_code
+createUniqueEntity(const Twine &Model, int &ResultFD,
+                   SmallVectorImpl<char> &ResultPath, bool MakeAbsolute,
+                   unsigned Mode, FSEntity Type,
+                   sys::fs::OpenFlags Flags = sys::fs::OF_None) {
+
+  // Limit the number of attempts we make, so that we don't infinite loop. E.g.
+  // "permission denied" could be for a specific file (so we retry with a
+  // different name) or for the whole directory (retry would always fail).
+  // Checking which is racy, so we try a number of times, then give up.
+  std::error_code EC;
+  for (int Retries = 128; Retries > 0; --Retries) {
+    sys::fs::createUniquePath(Model, ResultPath, MakeAbsolute);
+    // Try to open + create the file.
+    switch (Type) {
+    case FS_File: {
+      EC = sys::fs::openFileForReadWrite(Twine(ResultPath.begin()), ResultFD,
+                                         sys::fs::CD_CreateNew, Flags, Mode);
+      if (EC) {
+        // errc::permission_denied happens on Windows when we try to open a file
+        // that has been marked for deletion.
+        if (EC == errc::file_exists || EC == errc::permission_denied)
+          continue;
+        return EC;
+      }
+
+      return std::error_code();
+    }
+
+    case FS_Name: {
+      EC = sys::fs::access(ResultPath.begin(), sys::fs::AccessMode::Exist);
+      if (EC == errc::no_such_file_or_directory)
+        return std::error_code();
+      if (EC)
+        return EC;
+      continue;
+    }
+
+    case FS_Dir: {
+      EC = sys::fs::create_directory(ResultPath.begin(), false);
+      if (EC) {
+        if (EC == errc::file_exists)
+          continue;
+        return EC;
+      }
+      return std::error_code();
+    }
+    }
+    llvm_unreachable("Invalid Type");
+  }
+  return EC;
+}
+
+namespace llvm {
+namespace sys  {
+namespace path {
+
+const_iterator begin(StringRef path, Style style) {
+  const_iterator i;
+  i.Path      = path;
+  i.Component = find_first_component(path, style);
+  i.Position  = 0;
+  i.S = style;
+  return i;
+}
+
+const_iterator end(StringRef path) {
+  const_iterator i;
+  i.Path      = path;
+  i.Position  = path.size();
+  return i;
+}
+
+const_iterator &const_iterator::operator++() {
+  assert(Position < Path.size() && "Tried to increment past end!");
+
+  // Increment Position to past the current component
+  Position += Component.size();
+
+  // Check for end.
+  if (Position == Path.size()) {
+    Component = StringRef();
+    return *this;
+  }
+
+  // Both POSIX and Windows treat paths that begin with exactly two separators
+  // specially.
+  bool was_net = Component.size() > 2 && is_separator(Component[0], S) &&
+                 Component[1] == Component[0] && !is_separator(Component[2], S);
+
+  // Handle separators.
+  if (is_separator(Path[Position], S)) {
+    // Root dir.
+    if (was_net ||
+        // c:/
+        (real_style(S) == Style::windows && Component.endswith(":"))) {
+      Component = Path.substr(Position, 1);
+      return *this;
+    }
+
+    // Skip extra separators.
+    while (Position != Path.size() && is_separator(Path[Position], S)) {
+      ++Position;
+    }
+
+    // Treat trailing '/' as a '.', unless it is the root dir.
+    if (Position == Path.size() && Component != "/") {
+      --Position;
+      Component = ".";
+      return *this;
+    }
+  }
+
+  // Find next component.
+  size_t end_pos = Path.find_first_of(separators(S), Position);
+  Component = Path.slice(Position, end_pos);
+
+  return *this;
+}
+
+bool const_iterator::operator==(const const_iterator &RHS) const {
+  return Path.begin() == RHS.Path.begin() && Position == RHS.Position;
+}
+
+ptrdiff_t const_iterator::operator-(const const_iterator &RHS) const {
+  return Position - RHS.Position;
+}
+
+reverse_iterator rbegin(StringRef Path, Style style) {
+  reverse_iterator I;
+  I.Path = Path;
+  I.Position = Path.size();
+  I.S = style;
+  ++I;
+  return I;
+}
+
+reverse_iterator rend(StringRef Path) {
+  reverse_iterator I;
+  I.Path = Path;
+  I.Component = Path.substr(0, 0);
+  I.Position = 0;
+  return I;
+}
+
+reverse_iterator &reverse_iterator::operator++() {
+  size_t root_dir_pos = root_dir_start(Path, S);
+
+  // Skip separators unless it's the root directory.
+  size_t end_pos = Position;
+  while (end_pos > 0 && (end_pos - 1) != root_dir_pos &&
+         is_separator(Path[end_pos - 1], S))
+    --end_pos;
+
+  // Treat trailing '/' as a '.', unless it is the root dir.
+  if (Position == Path.size() && !Path.empty() &&
+      is_separator(Path.back(), S) &&
+      (root_dir_pos == StringRef::npos || end_pos - 1 > root_dir_pos)) {
+    --Position;
+    Component = ".";
+    return *this;
+  }
+
+  // Find next separator.
+  size_t start_pos = filename_pos(Path.substr(0, end_pos), S);
+  Component = Path.slice(start_pos, end_pos);
+  Position = start_pos;
+  return *this;
+}
+
+bool reverse_iterator::operator==(const reverse_iterator &RHS) const {
+  return Path.begin() == RHS.Path.begin() && Component == RHS.Component &&
+         Position == RHS.Position;
+}
+
+ptrdiff_t reverse_iterator::operator-(const reverse_iterator &RHS) const {
+  return Position - RHS.Position;
+}
+
+StringRef root_path(StringRef path, Style style) {
+  const_iterator b = begin(path, style), pos = b, e = end(path);
+  if (b != e) {
+    bool has_net =
+        b->size() > 2 && is_separator((*b)[0], style) && (*b)[1] == (*b)[0];
+    bool has_drive = (real_style(style) == Style::windows) && b->endswith(":");
+
+    if (has_net || has_drive) {
+      if ((++pos != e) && is_separator((*pos)[0], style)) {
+        // {C:/,//net/}, so get the first two components.
+        return path.substr(0, b->size() + pos->size());
+      }
       // just {C:,//net}, return the first component.
       return *b;
-    } 
- 
-    // POSIX style root directory. 
-    if (is_separator((*b)[0], style)) { 
-      return *b; 
-    } 
-  } 
- 
-  return StringRef(); 
-} 
- 
-StringRef root_name(StringRef path, Style style) { 
-  const_iterator b = begin(path, style), e = end(path); 
-  if (b != e) { 
-    bool has_net = 
-        b->size() > 2 && is_separator((*b)[0], style) && (*b)[1] == (*b)[0]; 
-    bool has_drive = (real_style(style) == Style::windows) && b->endswith(":"); 
- 
-    if (has_net || has_drive) { 
-      // just {C:,//net}, return the first component. 
-      return *b; 
-    } 
-  } 
- 
-  // No path or no name. 
-  return StringRef(); 
-} 
- 
-StringRef root_directory(StringRef path, Style style) { 
-  const_iterator b = begin(path, style), pos = b, e = end(path); 
-  if (b != e) { 
-    bool has_net = 
-        b->size() > 2 && is_separator((*b)[0], style) && (*b)[1] == (*b)[0]; 
-    bool has_drive = (real_style(style) == Style::windows) && b->endswith(":"); 
- 
-    if ((has_net || has_drive) && 
-        // {C:,//net}, skip to the next component. 
-        (++pos != e) && is_separator((*pos)[0], style)) { 
-      return *pos; 
-    } 
- 
-    // POSIX style root directory. 
-    if (!has_net && is_separator((*b)[0], style)) { 
-      return *b; 
-    } 
-  } 
- 
-  // No path or no root. 
-  return StringRef(); 
-} 
- 
-StringRef relative_path(StringRef path, Style style) { 
-  StringRef root = root_path(path, style); 
-  return path.substr(root.size()); 
-} 
- 
-void append(SmallVectorImpl<char> &path, Style style, const Twine &a, 
-            const Twine &b, const Twine &c, const Twine &d) { 
-  SmallString<32> a_storage; 
-  SmallString<32> b_storage; 
-  SmallString<32> c_storage; 
-  SmallString<32> d_storage; 
- 
-  SmallVector<StringRef, 4> components; 
-  if (!a.isTriviallyEmpty()) components.push_back(a.toStringRef(a_storage)); 
-  if (!b.isTriviallyEmpty()) components.push_back(b.toStringRef(b_storage)); 
-  if (!c.isTriviallyEmpty()) components.push_back(c.toStringRef(c_storage)); 
-  if (!d.isTriviallyEmpty()) components.push_back(d.toStringRef(d_storage)); 
- 
-  for (auto &component : components) { 
-    bool path_has_sep = 
-        !path.empty() && is_separator(path[path.size() - 1], style); 
-    if (path_has_sep) { 
-      // Strip separators from beginning of component. 
-      size_t loc = component.find_first_not_of(separators(style)); 
-      StringRef c = component.substr(loc); 
- 
-      // Append it. 
-      path.append(c.begin(), c.end()); 
-      continue; 
-    } 
- 
-    bool component_has_sep = 
-        !component.empty() && is_separator(component[0], style); 
-    if (!component_has_sep && 
-        !(path.empty() || has_root_name(component, style))) { 
-      // Add a separator. 
-      path.push_back(preferred_separator(style)); 
-    } 
- 
-    path.append(component.begin(), component.end()); 
-  } 
-} 
- 
-void append(SmallVectorImpl<char> &path, const Twine &a, const Twine &b, 
-            const Twine &c, const Twine &d) { 
-  append(path, Style::native, a, b, c, d); 
-} 
- 
-void append(SmallVectorImpl<char> &path, const_iterator begin, 
-            const_iterator end, Style style) { 
-  for (; begin != end; ++begin) 
-    path::append(path, style, *begin); 
-} 
- 
-StringRef parent_path(StringRef path, Style style) { 
-  size_t end_pos = parent_path_end(path, style); 
-  if (end_pos == StringRef::npos) 
-    return StringRef(); 
+    }
+
+    // POSIX style root directory.
+    if (is_separator((*b)[0], style)) {
+      return *b;
+    }
+  }
+
+  return StringRef();
+}
+
+StringRef root_name(StringRef path, Style style) {
+  const_iterator b = begin(path, style), e = end(path);
+  if (b != e) {
+    bool has_net =
+        b->size() > 2 && is_separator((*b)[0], style) && (*b)[1] == (*b)[0];
+    bool has_drive = (real_style(style) == Style::windows) && b->endswith(":");
+
+    if (has_net || has_drive) {
+      // just {C:,//net}, return the first component.
+      return *b;
+    }
+  }
+
+  // No path or no name.
+  return StringRef();
+}
+
+StringRef root_directory(StringRef path, Style style) {
+  const_iterator b = begin(path, style), pos = b, e = end(path);
+  if (b != e) {
+    bool has_net =
+        b->size() > 2 && is_separator((*b)[0], style) && (*b)[1] == (*b)[0];
+    bool has_drive = (real_style(style) == Style::windows) && b->endswith(":");
+
+    if ((has_net || has_drive) &&
+        // {C:,//net}, skip to the next component.
+        (++pos != e) && is_separator((*pos)[0], style)) {
+      return *pos;
+    }
+
+    // POSIX style root directory.
+    if (!has_net && is_separator((*b)[0], style)) {
+      return *b;
+    }
+  }
+
+  // No path or no root.
+  return StringRef();
+}
+
+StringRef relative_path(StringRef path, Style style) {
+  StringRef root = root_path(path, style);
+  return path.substr(root.size());
+}
+
+void append(SmallVectorImpl<char> &path, Style style, const Twine &a,
+            const Twine &b, const Twine &c, const Twine &d) {
+  SmallString<32> a_storage;
+  SmallString<32> b_storage;
+  SmallString<32> c_storage;
+  SmallString<32> d_storage;
+
+  SmallVector<StringRef, 4> components;
+  if (!a.isTriviallyEmpty()) components.push_back(a.toStringRef(a_storage));
+  if (!b.isTriviallyEmpty()) components.push_back(b.toStringRef(b_storage));
+  if (!c.isTriviallyEmpty()) components.push_back(c.toStringRef(c_storage));
+  if (!d.isTriviallyEmpty()) components.push_back(d.toStringRef(d_storage));
+
+  for (auto &component : components) {
+    bool path_has_sep =
+        !path.empty() && is_separator(path[path.size() - 1], style);
+    if (path_has_sep) {
+      // Strip separators from beginning of component.
+      size_t loc = component.find_first_not_of(separators(style));
+      StringRef c = component.substr(loc);
+
+      // Append it.
+      path.append(c.begin(), c.end());
+      continue;
+    }
+
+    bool component_has_sep =
+        !component.empty() && is_separator(component[0], style);
+    if (!component_has_sep &&
+        !(path.empty() || has_root_name(component, style))) {
+      // Add a separator.
+      path.push_back(preferred_separator(style));
+    }
+
+    path.append(component.begin(), component.end());
+  }
+}
+
+void append(SmallVectorImpl<char> &path, const Twine &a, const Twine &b,
+            const Twine &c, const Twine &d) {
+  append(path, Style::native, a, b, c, d);
+}
+
+void append(SmallVectorImpl<char> &path, const_iterator begin,
+            const_iterator end, Style style) {
+  for (; begin != end; ++begin)
+    path::append(path, style, *begin);
+}
+
+StringRef parent_path(StringRef path, Style style) {
+  size_t end_pos = parent_path_end(path, style);
+  if (end_pos == StringRef::npos)
+    return StringRef();
   return path.substr(0, end_pos);
-} 
- 
-void remove_filename(SmallVectorImpl<char> &path, Style style) { 
-  size_t end_pos = parent_path_end(StringRef(path.begin(), path.size()), style); 
-  if (end_pos != StringRef::npos) 
-    path.set_size(end_pos); 
-} 
- 
-void replace_extension(SmallVectorImpl<char> &path, const Twine &extension, 
-                       Style style) { 
-  StringRef p(path.begin(), path.size()); 
-  SmallString<32> ext_storage; 
-  StringRef ext = extension.toStringRef(ext_storage); 
- 
-  // Erase existing extension. 
-  size_t pos = p.find_last_of('.'); 
-  if (pos != StringRef::npos && pos >= filename_pos(p, style)) 
-    path.set_size(pos); 
- 
-  // Append '.' if needed. 
-  if (ext.size() > 0 && ext[0] != '.') 
-    path.push_back('.'); 
- 
-  // Append extension. 
-  path.append(ext.begin(), ext.end()); 
-} 
- 
-static bool starts_with(StringRef Path, StringRef Prefix, 
-                        Style style = Style::native) { 
-  // Windows prefix matching : case and separator insensitive 
-  if (real_style(style) == Style::windows) { 
-    if (Path.size() < Prefix.size()) 
-      return false; 
-    for (size_t I = 0, E = Prefix.size(); I != E; ++I) { 
-      bool SepPath = is_separator(Path[I], style); 
-      bool SepPrefix = is_separator(Prefix[I], style); 
-      if (SepPath != SepPrefix) 
-        return false; 
-      if (!SepPath && toLower(Path[I]) != toLower(Prefix[I])) 
-        return false; 
-    } 
-    return true; 
-  } 
-  return Path.startswith(Prefix); 
-} 
- 
-bool replace_path_prefix(SmallVectorImpl<char> &Path, StringRef OldPrefix, 
-                         StringRef NewPrefix, Style style) { 
-  if (OldPrefix.empty() && NewPrefix.empty()) 
-    return false; 
- 
-  StringRef OrigPath(Path.begin(), Path.size()); 
-  if (!starts_with(OrigPath, OldPrefix, style)) 
-    return false; 
- 
-  // If prefixes have the same size we can simply copy the new one over. 
-  if (OldPrefix.size() == NewPrefix.size()) { 
-    llvm::copy(NewPrefix, Path.begin()); 
-    return true; 
-  } 
- 
-  StringRef RelPath = OrigPath.substr(OldPrefix.size()); 
-  SmallString<256> NewPath; 
-  (Twine(NewPrefix) + RelPath).toVector(NewPath); 
-  Path.swap(NewPath); 
-  return true; 
-} 
- 
-void native(const Twine &path, SmallVectorImpl<char> &result, Style style) { 
-  assert((!path.isSingleStringRef() || 
-          path.getSingleStringRef().data() != result.data()) && 
-         "path and result are not allowed to overlap!"); 
-  // Clear result. 
-  result.clear(); 
-  path.toVector(result); 
-  native(result, style); 
-} 
- 
-void native(SmallVectorImpl<char> &Path, Style style) { 
-  if (Path.empty()) 
-    return; 
-  if (real_style(style) == Style::windows) { 
-    std::replace(Path.begin(), Path.end(), '/', '\\'); 
-    if (Path[0] == '~' && (Path.size() == 1 || is_separator(Path[1], style))) { 
-      SmallString<128> PathHome; 
-      home_directory(PathHome); 
-      PathHome.append(Path.begin() + 1, Path.end()); 
-      Path = PathHome; 
-    } 
-  } else { 
-    for (auto PI = Path.begin(), PE = Path.end(); PI < PE; ++PI) 
-      if (*PI == '\\') 
-        *PI = '/'; 
-  } 
-} 
- 
-std::string convert_to_slash(StringRef path, Style style) { 
-  if (real_style(style) != Style::windows) 
-    return std::string(path); 
- 
-  std::string s = path.str(); 
-  std::replace(s.begin(), s.end(), '\\', '/'); 
-  return s; 
-} 
- 
-StringRef filename(StringRef path, Style style) { return *rbegin(path, style); } 
- 
-StringRef stem(StringRef path, Style style) { 
-  StringRef fname = filename(path, style); 
-  size_t pos = fname.find_last_of('.'); 
-  if (pos == StringRef::npos) 
-    return fname; 
+}
+
+void remove_filename(SmallVectorImpl<char> &path, Style style) {
+  size_t end_pos = parent_path_end(StringRef(path.begin(), path.size()), style);
+  if (end_pos != StringRef::npos)
+    path.set_size(end_pos);
+}
+
+void replace_extension(SmallVectorImpl<char> &path, const Twine &extension,
+                       Style style) {
+  StringRef p(path.begin(), path.size());
+  SmallString<32> ext_storage;
+  StringRef ext = extension.toStringRef(ext_storage);
+
+  // Erase existing extension.
+  size_t pos = p.find_last_of('.');
+  if (pos != StringRef::npos && pos >= filename_pos(p, style))
+    path.set_size(pos);
+
+  // Append '.' if needed.
+  if (ext.size() > 0 && ext[0] != '.')
+    path.push_back('.');
+
+  // Append extension.
+  path.append(ext.begin(), ext.end());
+}
+
+static bool starts_with(StringRef Path, StringRef Prefix,
+                        Style style = Style::native) {
+  // Windows prefix matching : case and separator insensitive
+  if (real_style(style) == Style::windows) {
+    if (Path.size() < Prefix.size())
+      return false;
+    for (size_t I = 0, E = Prefix.size(); I != E; ++I) {
+      bool SepPath = is_separator(Path[I], style);
+      bool SepPrefix = is_separator(Prefix[I], style);
+      if (SepPath != SepPrefix)
+        return false;
+      if (!SepPath && toLower(Path[I]) != toLower(Prefix[I]))
+        return false;
+    }
+    return true;
+  }
+  return Path.startswith(Prefix);
+}
+
+bool replace_path_prefix(SmallVectorImpl<char> &Path, StringRef OldPrefix,
+                         StringRef NewPrefix, Style style) {
+  if (OldPrefix.empty() && NewPrefix.empty())
+    return false;
+
+  StringRef OrigPath(Path.begin(), Path.size());
+  if (!starts_with(OrigPath, OldPrefix, style))
+    return false;
+
+  // If prefixes have the same size we can simply copy the new one over.
+  if (OldPrefix.size() == NewPrefix.size()) {
+    llvm::copy(NewPrefix, Path.begin());
+    return true;
+  }
+
+  StringRef RelPath = OrigPath.substr(OldPrefix.size());
+  SmallString<256> NewPath;
+  (Twine(NewPrefix) + RelPath).toVector(NewPath);
+  Path.swap(NewPath);
+  return true;
+}
+
+void native(const Twine &path, SmallVectorImpl<char> &result, Style style) {
+  assert((!path.isSingleStringRef() ||
+          path.getSingleStringRef().data() != result.data()) &&
+         "path and result are not allowed to overlap!");
+  // Clear result.
+  result.clear();
+  path.toVector(result);
+  native(result, style);
+}
+
+void native(SmallVectorImpl<char> &Path, Style style) {
+  if (Path.empty())
+    return;
+  if (real_style(style) == Style::windows) {
+    std::replace(Path.begin(), Path.end(), '/', '\\');
+    if (Path[0] == '~' && (Path.size() == 1 || is_separator(Path[1], style))) {
+      SmallString<128> PathHome;
+      home_directory(PathHome);
+      PathHome.append(Path.begin() + 1, Path.end());
+      Path = PathHome;
+    }
+  } else {
+    for (auto PI = Path.begin(), PE = Path.end(); PI < PE; ++PI)
+      if (*PI == '\\')
+        *PI = '/';
+  }
+}
+
+std::string convert_to_slash(StringRef path, Style style) {
+  if (real_style(style) != Style::windows)
+    return std::string(path);
+
+  std::string s = path.str();
+  std::replace(s.begin(), s.end(), '\\', '/');
+  return s;
+}
+
+StringRef filename(StringRef path, Style style) { return *rbegin(path, style); }
+
+StringRef stem(StringRef path, Style style) {
+  StringRef fname = filename(path, style);
+  size_t pos = fname.find_last_of('.');
+  if (pos == StringRef::npos)
+    return fname;
   if ((fname.size() == 1 && fname == ".") ||
       (fname.size() == 2 && fname == ".."))
     return fname;
   return fname.substr(0, pos);
-} 
- 
-StringRef extension(StringRef path, Style style) { 
-  StringRef fname = filename(path, style); 
-  size_t pos = fname.find_last_of('.'); 
-  if (pos == StringRef::npos) 
-    return StringRef(); 
+}
+
+StringRef extension(StringRef path, Style style) {
+  StringRef fname = filename(path, style);
+  size_t pos = fname.find_last_of('.');
+  if (pos == StringRef::npos)
+    return StringRef();
   if ((fname.size() == 1 && fname == ".") ||
       (fname.size() == 2 && fname == ".."))
     return StringRef();
   return fname.substr(pos);
-} 
- 
-bool is_separator(char value, Style style) { 
-  if (value == '/') 
-    return true; 
-  if (real_style(style) == Style::windows) 
-    return value == '\\'; 
-  return false; 
-} 
- 
-StringRef get_separator(Style style) { 
-  if (real_style(style) == Style::windows) 
-    return "\\"; 
-  return "/"; 
-} 
- 
-bool has_root_name(const Twine &path, Style style) { 
-  SmallString<128> path_storage; 
-  StringRef p = path.toStringRef(path_storage); 
- 
-  return !root_name(p, style).empty(); 
-} 
- 
-bool has_root_directory(const Twine &path, Style style) { 
-  SmallString<128> path_storage; 
-  StringRef p = path.toStringRef(path_storage); 
- 
-  return !root_directory(p, style).empty(); 
-} 
- 
-bool has_root_path(const Twine &path, Style style) { 
-  SmallString<128> path_storage; 
-  StringRef p = path.toStringRef(path_storage); 
- 
-  return !root_path(p, style).empty(); 
-} 
- 
-bool has_relative_path(const Twine &path, Style style) { 
-  SmallString<128> path_storage; 
-  StringRef p = path.toStringRef(path_storage); 
- 
-  return !relative_path(p, style).empty(); 
-} 
- 
-bool has_filename(const Twine &path, Style style) { 
-  SmallString<128> path_storage; 
-  StringRef p = path.toStringRef(path_storage); 
- 
-  return !filename(p, style).empty(); 
-} 
- 
-bool has_parent_path(const Twine &path, Style style) { 
-  SmallString<128> path_storage; 
-  StringRef p = path.toStringRef(path_storage); 
- 
-  return !parent_path(p, style).empty(); 
-} 
- 
-bool has_stem(const Twine &path, Style style) { 
-  SmallString<128> path_storage; 
-  StringRef p = path.toStringRef(path_storage); 
- 
-  return !stem(p, style).empty(); 
-} 
- 
-bool has_extension(const Twine &path, Style style) { 
-  SmallString<128> path_storage; 
-  StringRef p = path.toStringRef(path_storage); 
- 
-  return !extension(p, style).empty(); 
-} 
- 
-bool is_absolute(const Twine &path, Style style) { 
-  SmallString<128> path_storage; 
-  StringRef p = path.toStringRef(path_storage); 
- 
-  bool rootDir = has_root_directory(p, style); 
-  bool rootName = 
-      (real_style(style) != Style::windows) || has_root_name(p, style); 
- 
-  return rootDir && rootName; 
-} 
- 
+}
+
+bool is_separator(char value, Style style) {
+  if (value == '/')
+    return true;
+  if (real_style(style) == Style::windows)
+    return value == '\\';
+  return false;
+}
+
+StringRef get_separator(Style style) {
+  if (real_style(style) == Style::windows)
+    return "\\";
+  return "/";
+}
+
+bool has_root_name(const Twine &path, Style style) {
+  SmallString<128> path_storage;
+  StringRef p = path.toStringRef(path_storage);
+
+  return !root_name(p, style).empty();
+}
+
+bool has_root_directory(const Twine &path, Style style) {
+  SmallString<128> path_storage;
+  StringRef p = path.toStringRef(path_storage);
+
+  return !root_directory(p, style).empty();
+}
+
+bool has_root_path(const Twine &path, Style style) {
+  SmallString<128> path_storage;
+  StringRef p = path.toStringRef(path_storage);
+
+  return !root_path(p, style).empty();
+}
+
+bool has_relative_path(const Twine &path, Style style) {
+  SmallString<128> path_storage;
+  StringRef p = path.toStringRef(path_storage);
+
+  return !relative_path(p, style).empty();
+}
+
+bool has_filename(const Twine &path, Style style) {
+  SmallString<128> path_storage;
+  StringRef p = path.toStringRef(path_storage);
+
+  return !filename(p, style).empty();
+}
+
+bool has_parent_path(const Twine &path, Style style) {
+  SmallString<128> path_storage;
+  StringRef p = path.toStringRef(path_storage);
+
+  return !parent_path(p, style).empty();
+}
+
+bool has_stem(const Twine &path, Style style) {
+  SmallString<128> path_storage;
+  StringRef p = path.toStringRef(path_storage);
+
+  return !stem(p, style).empty();
+}
+
+bool has_extension(const Twine &path, Style style) {
+  SmallString<128> path_storage;
+  StringRef p = path.toStringRef(path_storage);
+
+  return !extension(p, style).empty();
+}
+
+bool is_absolute(const Twine &path, Style style) {
+  SmallString<128> path_storage;
+  StringRef p = path.toStringRef(path_storage);
+
+  bool rootDir = has_root_directory(p, style);
+  bool rootName =
+      (real_style(style) != Style::windows) || has_root_name(p, style);
+
+  return rootDir && rootName;
+}
+
 bool is_absolute_gnu(const Twine &path, Style style) {
   SmallString<128> path_storage;
   StringRef p = path.toStringRef(path_storage);
@@ -695,605 +695,605 @@ bool is_absolute_gnu(const Twine &path, Style style) {
   return false;
 }
 
-bool is_relative(const Twine &path, Style style) { 
-  return !is_absolute(path, style); 
-} 
- 
-StringRef remove_leading_dotslash(StringRef Path, Style style) { 
-  // Remove leading "./" (or ".//" or "././" etc.) 
-  while (Path.size() > 2 && Path[0] == '.' && is_separator(Path[1], style)) { 
-    Path = Path.substr(2); 
-    while (Path.size() > 0 && is_separator(Path[0], style)) 
-      Path = Path.substr(1); 
-  } 
-  return Path; 
-} 
- 
-// Remove path traversal components ("." and "..") when possible, and 
-// canonicalize slashes. 
-bool remove_dots(SmallVectorImpl<char> &the_path, bool remove_dot_dot, 
-                 Style style) { 
-  style = real_style(style); 
-  StringRef remaining(the_path.data(), the_path.size()); 
-  bool needs_change = false; 
-  SmallVector<StringRef, 16> components; 
- 
-  // Consume the root path, if present. 
-  StringRef root = path::root_path(remaining, style); 
-  bool absolute = !root.empty(); 
-  if (absolute) 
-    remaining = remaining.drop_front(root.size()); 
- 
-  // Loop over path components manually. This makes it easier to detect 
-  // non-preferred slashes and double separators that must be canonicalized. 
-  while (!remaining.empty()) { 
-    size_t next_slash = remaining.find_first_of(separators(style)); 
-    if (next_slash == StringRef::npos) 
-      next_slash = remaining.size(); 
-    StringRef component = remaining.take_front(next_slash); 
-    remaining = remaining.drop_front(next_slash); 
- 
-    // Eat the slash, and check if it is the preferred separator. 
-    if (!remaining.empty()) { 
-      needs_change |= remaining.front() != preferred_separator(style); 
-      remaining = remaining.drop_front(); 
-      // The path needs to be rewritten if it has a trailing slash. 
-      // FIXME: This is emergent behavior that could be removed. 
-      needs_change |= remaining.empty(); 
-    } 
- 
-    // Check for path traversal components or double separators. 
-    if (component.empty() || component == ".") { 
-      needs_change = true; 
-    } else if (remove_dot_dot && component == "..") { 
-      needs_change = true; 
-      // Do not allow ".." to remove the root component. If this is the 
-      // beginning of a relative path, keep the ".." component. 
-      if (!components.empty() && components.back() != "..") { 
-        components.pop_back(); 
-      } else if (!absolute) { 
-        components.push_back(component); 
-      } 
-    } else { 
-      components.push_back(component); 
-    } 
-  } 
- 
-  // Avoid rewriting the path unless we have to. 
-  if (!needs_change) 
-    return false; 
- 
-  SmallString<256> buffer = root; 
-  if (!components.empty()) { 
-    buffer += components[0]; 
-    for (StringRef C : makeArrayRef(components).drop_front()) { 
-      buffer += preferred_separator(style); 
-      buffer += C; 
-    } 
-  } 
-  the_path.swap(buffer); 
-  return true; 
-} 
- 
-} // end namespace path 
- 
-namespace fs { 
- 
-std::error_code getUniqueID(const Twine Path, UniqueID &Result) { 
-  file_status Status; 
-  std::error_code EC = status(Path, Status); 
-  if (EC) 
-    return EC; 
-  Result = Status.getUniqueID(); 
-  return std::error_code(); 
-} 
- 
-void createUniquePath(const Twine &Model, SmallVectorImpl<char> &ResultPath, 
-                      bool MakeAbsolute) { 
-  SmallString<128> ModelStorage; 
-  Model.toVector(ModelStorage); 
- 
-  if (MakeAbsolute) { 
-    // Make model absolute by prepending a temp directory if it's not already. 
-    if (!sys::path::is_absolute(Twine(ModelStorage))) { 
-      SmallString<128> TDir; 
-      sys::path::system_temp_directory(true, TDir); 
-      sys::path::append(TDir, Twine(ModelStorage)); 
-      ModelStorage.swap(TDir); 
-    } 
-  } 
- 
-  ResultPath = ModelStorage; 
-  ResultPath.push_back(0); 
-  ResultPath.pop_back(); 
- 
-  // Replace '%' with random chars. 
-  for (unsigned i = 0, e = ModelStorage.size(); i != e; ++i) { 
-    if (ModelStorage[i] == '%') 
-      ResultPath[i] = "0123456789abcdef"[sys::Process::GetRandomNumber() & 15]; 
-  } 
-} 
- 
-std::error_code createUniqueFile(const Twine &Model, int &ResultFd, 
-                                 SmallVectorImpl<char> &ResultPath, 
-                                 unsigned Mode) { 
-  return createUniqueEntity(Model, ResultFd, ResultPath, false, Mode, FS_File); 
-} 
- 
-static std::error_code createUniqueFile(const Twine &Model, int &ResultFd, 
-                                        SmallVectorImpl<char> &ResultPath, 
-                                        unsigned Mode, OpenFlags Flags) { 
-  return createUniqueEntity(Model, ResultFd, ResultPath, false, Mode, FS_File, 
-                            Flags); 
-} 
- 
-std::error_code createUniqueFile(const Twine &Model, 
-                                 SmallVectorImpl<char> &ResultPath, 
-                                 unsigned Mode) { 
-  int FD; 
-  auto EC = createUniqueFile(Model, FD, ResultPath, Mode); 
-  if (EC) 
-    return EC; 
-  // FD is only needed to avoid race conditions. Close it right away. 
-  close(FD); 
-  return EC; 
-} 
- 
-static std::error_code 
-createTemporaryFile(const Twine &Model, int &ResultFD, 
-                    llvm::SmallVectorImpl<char> &ResultPath, FSEntity Type) { 
-  SmallString<128> Storage; 
-  StringRef P = Model.toNullTerminatedStringRef(Storage); 
-  assert(P.find_first_of(separators(Style::native)) == StringRef::npos && 
-         "Model must be a simple filename."); 
-  // Use P.begin() so that createUniqueEntity doesn't need to recreate Storage. 
-  return createUniqueEntity(P.begin(), ResultFD, ResultPath, true, 
-                            owner_read | owner_write, Type); 
-} 
- 
-static std::error_code 
-createTemporaryFile(const Twine &Prefix, StringRef Suffix, int &ResultFD, 
-                    llvm::SmallVectorImpl<char> &ResultPath, FSEntity Type) { 
-  const char *Middle = Suffix.empty() ? "-%%%%%%" : "-%%%%%%."; 
-  return createTemporaryFile(Prefix + Middle + Suffix, ResultFD, ResultPath, 
-                             Type); 
-} 
- 
-std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix, 
-                                    int &ResultFD, 
-                                    SmallVectorImpl<char> &ResultPath) { 
-  return createTemporaryFile(Prefix, Suffix, ResultFD, ResultPath, FS_File); 
-} 
- 
-std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix, 
-                                    SmallVectorImpl<char> &ResultPath) { 
-  int FD; 
-  auto EC = createTemporaryFile(Prefix, Suffix, FD, ResultPath); 
-  if (EC) 
-    return EC; 
-  // FD is only needed to avoid race conditions. Close it right away. 
-  close(FD); 
-  return EC; 
-} 
- 
- 
-// This is a mkdtemp with a different pattern. We use createUniqueEntity mostly 
-// for consistency. We should try using mkdtemp. 
-std::error_code createUniqueDirectory(const Twine &Prefix, 
-                                      SmallVectorImpl<char> &ResultPath) { 
-  int Dummy; 
-  return createUniqueEntity(Prefix + "-%%%%%%", Dummy, ResultPath, true, 0, 
-                            FS_Dir); 
-} 
- 
-std::error_code 
-getPotentiallyUniqueFileName(const Twine &Model, 
-                             SmallVectorImpl<char> &ResultPath) { 
-  int Dummy; 
-  return createUniqueEntity(Model, Dummy, ResultPath, false, 0, FS_Name); 
-} 
- 
-std::error_code 
-getPotentiallyUniqueTempFileName(const Twine &Prefix, StringRef Suffix, 
-                                 SmallVectorImpl<char> &ResultPath) { 
-  int Dummy; 
-  return createTemporaryFile(Prefix, Suffix, Dummy, ResultPath, FS_Name); 
-} 
- 
-void make_absolute(const Twine &current_directory, 
-                   SmallVectorImpl<char> &path) { 
-  StringRef p(path.data(), path.size()); 
- 
-  bool rootDirectory = path::has_root_directory(p); 
-  bool rootName = path::has_root_name(p); 
- 
-  // Already absolute. 
-  if ((rootName || real_style(Style::native) != Style::windows) && 
-      rootDirectory) 
-    return; 
- 
-  // All of the following conditions will need the current directory. 
-  SmallString<128> current_dir; 
-  current_directory.toVector(current_dir); 
- 
-  // Relative path. Prepend the current directory. 
-  if (!rootName && !rootDirectory) { 
-    // Append path to the current directory. 
-    path::append(current_dir, p); 
-    // Set path to the result. 
-    path.swap(current_dir); 
-    return; 
-  } 
- 
-  if (!rootName && rootDirectory) { 
-    StringRef cdrn = path::root_name(current_dir); 
-    SmallString<128> curDirRootName(cdrn.begin(), cdrn.end()); 
-    path::append(curDirRootName, p); 
-    // Set path to the result. 
-    path.swap(curDirRootName); 
-    return; 
-  } 
- 
-  if (rootName && !rootDirectory) { 
-    StringRef pRootName      = path::root_name(p); 
-    StringRef bRootDirectory = path::root_directory(current_dir); 
-    StringRef bRelativePath  = path::relative_path(current_dir); 
-    StringRef pRelativePath  = path::relative_path(p); 
- 
-    SmallString<128> res; 
-    path::append(res, pRootName, bRootDirectory, bRelativePath, pRelativePath); 
-    path.swap(res); 
-    return; 
-  } 
- 
-  llvm_unreachable("All rootName and rootDirectory combinations should have " 
-                   "occurred above!"); 
-} 
- 
-std::error_code make_absolute(SmallVectorImpl<char> &path) { 
-  if (path::is_absolute(path)) 
-    return {}; 
- 
-  SmallString<128> current_dir; 
-  if (std::error_code ec = current_path(current_dir)) 
-    return ec; 
- 
-  make_absolute(current_dir, path); 
-  return {}; 
-} 
- 
-std::error_code create_directories(const Twine &Path, bool IgnoreExisting, 
-                                   perms Perms) { 
-  SmallString<128> PathStorage; 
-  StringRef P = Path.toStringRef(PathStorage); 
- 
-  // Be optimistic and try to create the directory 
-  std::error_code EC = create_directory(P, IgnoreExisting, Perms); 
-  // If we succeeded, or had any error other than the parent not existing, just 
-  // return it. 
-  if (EC != errc::no_such_file_or_directory) 
-    return EC; 
- 
-  // We failed because of a no_such_file_or_directory, try to create the 
-  // parent. 
-  StringRef Parent = path::parent_path(P); 
-  if (Parent.empty()) 
-    return EC; 
- 
-  if ((EC = create_directories(Parent, IgnoreExisting, Perms))) 
-      return EC; 
- 
-  return create_directory(P, IgnoreExisting, Perms); 
-} 
- 
-static std::error_code copy_file_internal(int ReadFD, int WriteFD) { 
-  const size_t BufSize = 4096; 
-  char *Buf = new char[BufSize]; 
-  int BytesRead = 0, BytesWritten = 0; 
-  for (;;) { 
-    BytesRead = read(ReadFD, Buf, BufSize); 
-    if (BytesRead <= 0) 
-      break; 
-    while (BytesRead) { 
-      BytesWritten = write(WriteFD, Buf, BytesRead); 
-      if (BytesWritten < 0) 
-        break; 
-      BytesRead -= BytesWritten; 
-    } 
-    if (BytesWritten < 0) 
-      break; 
-  } 
-  delete[] Buf; 
- 
-  if (BytesRead < 0 || BytesWritten < 0) 
-    return std::error_code(errno, std::generic_category()); 
-  return std::error_code(); 
-} 
- 
-#ifndef __APPLE__ 
-std::error_code copy_file(const Twine &From, const Twine &To) { 
-  int ReadFD, WriteFD; 
-  if (std::error_code EC = openFileForRead(From, ReadFD, OF_None)) 
-    return EC; 
-  if (std::error_code EC = 
-          openFileForWrite(To, WriteFD, CD_CreateAlways, OF_None)) { 
-    close(ReadFD); 
-    return EC; 
-  } 
- 
-  std::error_code EC = copy_file_internal(ReadFD, WriteFD); 
- 
-  close(ReadFD); 
-  close(WriteFD); 
- 
-  return EC; 
-} 
-#endif 
- 
-std::error_code copy_file(const Twine &From, int ToFD) { 
-  int ReadFD; 
-  if (std::error_code EC = openFileForRead(From, ReadFD, OF_None)) 
-    return EC; 
- 
-  std::error_code EC = copy_file_internal(ReadFD, ToFD); 
- 
-  close(ReadFD); 
- 
-  return EC; 
-} 
- 
-ErrorOr<MD5::MD5Result> md5_contents(int FD) { 
-  MD5 Hash; 
- 
-  constexpr size_t BufSize = 4096; 
-  std::vector<uint8_t> Buf(BufSize); 
-  int BytesRead = 0; 
-  for (;;) { 
-    BytesRead = read(FD, Buf.data(), BufSize); 
-    if (BytesRead <= 0) 
-      break; 
-    Hash.update(makeArrayRef(Buf.data(), BytesRead)); 
-  } 
- 
-  if (BytesRead < 0) 
-    return std::error_code(errno, std::generic_category()); 
-  MD5::MD5Result Result; 
-  Hash.final(Result); 
-  return Result; 
-} 
- 
-ErrorOr<MD5::MD5Result> md5_contents(const Twine &Path) { 
-  int FD; 
-  if (auto EC = openFileForRead(Path, FD, OF_None)) 
-    return EC; 
- 
-  auto Result = md5_contents(FD); 
-  close(FD); 
-  return Result; 
-} 
- 
-bool exists(const basic_file_status &status) { 
-  return status_known(status) && status.type() != file_type::file_not_found; 
-} 
- 
-bool status_known(const basic_file_status &s) { 
-  return s.type() != file_type::status_error; 
-} 
- 
-file_type get_file_type(const Twine &Path, bool Follow) { 
-  file_status st; 
-  if (status(Path, st, Follow)) 
-    return file_type::status_error; 
-  return st.type(); 
-} 
- 
-bool is_directory(const basic_file_status &status) { 
-  return status.type() == file_type::directory_file; 
-} 
- 
-std::error_code is_directory(const Twine &path, bool &result) { 
-  file_status st; 
-  if (std::error_code ec = status(path, st)) 
-    return ec; 
-  result = is_directory(st); 
-  return std::error_code(); 
-} 
- 
-bool is_regular_file(const basic_file_status &status) { 
-  return status.type() == file_type::regular_file; 
-} 
- 
-std::error_code is_regular_file(const Twine &path, bool &result) { 
-  file_status st; 
-  if (std::error_code ec = status(path, st)) 
-    return ec; 
-  result = is_regular_file(st); 
-  return std::error_code(); 
-} 
- 
-bool is_symlink_file(const basic_file_status &status) { 
-  return status.type() == file_type::symlink_file; 
-} 
- 
-std::error_code is_symlink_file(const Twine &path, bool &result) { 
-  file_status st; 
-  if (std::error_code ec = status(path, st, false)) 
-    return ec; 
-  result = is_symlink_file(st); 
-  return std::error_code(); 
-} 
- 
-bool is_other(const basic_file_status &status) { 
-  return exists(status) && 
-         !is_regular_file(status) && 
-         !is_directory(status); 
-} 
- 
-std::error_code is_other(const Twine &Path, bool &Result) { 
-  file_status FileStatus; 
-  if (std::error_code EC = status(Path, FileStatus)) 
-    return EC; 
-  Result = is_other(FileStatus); 
-  return std::error_code(); 
-} 
- 
-void directory_entry::replace_filename(const Twine &Filename, file_type Type, 
-                                       basic_file_status Status) { 
-  SmallString<128> PathStr = path::parent_path(Path); 
-  path::append(PathStr, Filename); 
-  this->Path = std::string(PathStr.str()); 
-  this->Type = Type; 
-  this->Status = Status; 
-} 
- 
-ErrorOr<perms> getPermissions(const Twine &Path) { 
-  file_status Status; 
-  if (std::error_code EC = status(Path, Status)) 
-    return EC; 
- 
-  return Status.permissions(); 
-} 
- 
-} // end namespace fs 
-} // end namespace sys 
-} // end namespace llvm 
- 
-// Include the truly platform-specific parts. 
-#if defined(LLVM_ON_UNIX) 
-#include "Unix/Path.inc" 
-#endif 
-#if defined(_WIN32) 
-#include "Windows/Path.inc" 
-#endif 
- 
-namespace llvm { 
-namespace sys { 
-namespace fs { 
-TempFile::TempFile(StringRef Name, int FD) 
-    : TmpName(std::string(Name)), FD(FD) {} 
-TempFile::TempFile(TempFile &&Other) { *this = std::move(Other); } 
-TempFile &TempFile::operator=(TempFile &&Other) { 
-  TmpName = std::move(Other.TmpName); 
-  FD = Other.FD; 
-  Other.Done = true; 
-  Other.FD = -1; 
-  return *this; 
-} 
- 
-TempFile::~TempFile() { assert(Done); } 
- 
-Error TempFile::discard() { 
-  Done = true; 
-  if (FD != -1 && close(FD) == -1) { 
-    std::error_code EC = std::error_code(errno, std::generic_category()); 
-    return errorCodeToError(EC); 
-  } 
-  FD = -1; 
- 
-#ifdef _WIN32 
-  // On windows closing will remove the file. 
-  TmpName = ""; 
-  return Error::success(); 
-#else 
-  // Always try to close and remove. 
-  std::error_code RemoveEC; 
-  if (!TmpName.empty()) { 
-    RemoveEC = fs::remove(TmpName); 
-    sys::DontRemoveFileOnSignal(TmpName); 
-    if (!RemoveEC) 
-      TmpName = ""; 
-  } 
-  return errorCodeToError(RemoveEC); 
-#endif 
-} 
- 
-Error TempFile::keep(const Twine &Name) { 
-  assert(!Done); 
-  Done = true; 
-  // Always try to close and rename. 
-#ifdef _WIN32 
-  // If we can't cancel the delete don't rename. 
-  auto H = reinterpret_cast<HANDLE>(_get_osfhandle(FD)); 
-  std::error_code RenameEC = setDeleteDisposition(H, false); 
-  if (!RenameEC) { 
-    RenameEC = rename_fd(FD, Name); 
-    // If rename failed because it's cross-device, copy instead 
-    if (RenameEC == 
-      std::error_code(ERROR_NOT_SAME_DEVICE, std::system_category())) { 
-      RenameEC = copy_file(TmpName, Name); 
-      setDeleteDisposition(H, true); 
-    } 
-  } 
- 
-  // If we can't rename, discard the temporary file. 
-  if (RenameEC) 
-    setDeleteDisposition(H, true); 
-#else 
-  std::error_code RenameEC = fs::rename(TmpName, Name); 
-  if (RenameEC) { 
-    // If we can't rename, try to copy to work around cross-device link issues. 
-    RenameEC = sys::fs::copy_file(TmpName, Name); 
-    // If we can't rename or copy, discard the temporary file. 
-    if (RenameEC) 
-      remove(TmpName); 
-  } 
-  sys::DontRemoveFileOnSignal(TmpName); 
-#endif 
- 
-  if (!RenameEC) 
-    TmpName = ""; 
- 
-  if (close(FD) == -1) { 
-    std::error_code EC(errno, std::generic_category()); 
-    return errorCodeToError(EC); 
-  } 
-  FD = -1; 
- 
-  return errorCodeToError(RenameEC); 
-} 
- 
-Error TempFile::keep() { 
-  assert(!Done); 
-  Done = true; 
- 
-#ifdef _WIN32 
-  auto H = reinterpret_cast<HANDLE>(_get_osfhandle(FD)); 
-  if (std::error_code EC = setDeleteDisposition(H, false)) 
-    return errorCodeToError(EC); 
-#else 
-  sys::DontRemoveFileOnSignal(TmpName); 
-#endif 
- 
-  TmpName = ""; 
- 
-  if (close(FD) == -1) { 
-    std::error_code EC(errno, std::generic_category()); 
-    return errorCodeToError(EC); 
-  } 
-  FD = -1; 
- 
-  return Error::success(); 
-} 
- 
-Expected<TempFile> TempFile::create(const Twine &Model, unsigned Mode) { 
-  int FD; 
-  SmallString<128> ResultPath; 
-  if (std::error_code EC = 
-          createUniqueFile(Model, FD, ResultPath, Mode, OF_Delete)) 
-    return errorCodeToError(EC); 
- 
-  TempFile Ret(ResultPath, FD); 
-#ifndef _WIN32 
-  if (sys::RemoveFileOnSignal(ResultPath)) { 
-    // Make sure we delete the file when RemoveFileOnSignal fails. 
-    consumeError(Ret.discard()); 
-    std::error_code EC(errc::operation_not_permitted); 
-    return errorCodeToError(EC); 
-  } 
-#endif 
-  return std::move(Ret); 
-} 
+bool is_relative(const Twine &path, Style style) {
+  return !is_absolute(path, style);
+}
+
+StringRef remove_leading_dotslash(StringRef Path, Style style) {
+  // Remove leading "./" (or ".//" or "././" etc.)
+  while (Path.size() > 2 && Path[0] == '.' && is_separator(Path[1], style)) {
+    Path = Path.substr(2);
+    while (Path.size() > 0 && is_separator(Path[0], style))
+      Path = Path.substr(1);
+  }
+  return Path;
+}
+
+// Remove path traversal components ("." and "..") when possible, and
+// canonicalize slashes.
+bool remove_dots(SmallVectorImpl<char> &the_path, bool remove_dot_dot,
+                 Style style) {
+  style = real_style(style);
+  StringRef remaining(the_path.data(), the_path.size());
+  bool needs_change = false;
+  SmallVector<StringRef, 16> components;
+
+  // Consume the root path, if present.
+  StringRef root = path::root_path(remaining, style);
+  bool absolute = !root.empty();
+  if (absolute)
+    remaining = remaining.drop_front(root.size());
+
+  // Loop over path components manually. This makes it easier to detect
+  // non-preferred slashes and double separators that must be canonicalized.
+  while (!remaining.empty()) {
+    size_t next_slash = remaining.find_first_of(separators(style));
+    if (next_slash == StringRef::npos)
+      next_slash = remaining.size();
+    StringRef component = remaining.take_front(next_slash);
+    remaining = remaining.drop_front(next_slash);
+
+    // Eat the slash, and check if it is the preferred separator.
+    if (!remaining.empty()) {
+      needs_change |= remaining.front() != preferred_separator(style);
+      remaining = remaining.drop_front();
+      // The path needs to be rewritten if it has a trailing slash.
+      // FIXME: This is emergent behavior that could be removed.
+      needs_change |= remaining.empty();
+    }
+
+    // Check for path traversal components or double separators.
+    if (component.empty() || component == ".") {
+      needs_change = true;
+    } else if (remove_dot_dot && component == "..") {
+      needs_change = true;
+      // Do not allow ".." to remove the root component. If this is the
+      // beginning of a relative path, keep the ".." component.
+      if (!components.empty() && components.back() != "..") {
+        components.pop_back();
+      } else if (!absolute) {
+        components.push_back(component);
+      }
+    } else {
+      components.push_back(component);
+    }
+  }
+
+  // Avoid rewriting the path unless we have to.
+  if (!needs_change)
+    return false;
+
+  SmallString<256> buffer = root;
+  if (!components.empty()) {
+    buffer += components[0];
+    for (StringRef C : makeArrayRef(components).drop_front()) {
+      buffer += preferred_separator(style);
+      buffer += C;
+    }
+  }
+  the_path.swap(buffer);
+  return true;
+}
+
+} // end namespace path
+
+namespace fs {
+
+std::error_code getUniqueID(const Twine Path, UniqueID &Result) {
+  file_status Status;
+  std::error_code EC = status(Path, Status);
+  if (EC)
+    return EC;
+  Result = Status.getUniqueID();
+  return std::error_code();
+}
+
+void createUniquePath(const Twine &Model, SmallVectorImpl<char> &ResultPath,
+                      bool MakeAbsolute) {
+  SmallString<128> ModelStorage;
+  Model.toVector(ModelStorage);
+
+  if (MakeAbsolute) {
+    // Make model absolute by prepending a temp directory if it's not already.
+    if (!sys::path::is_absolute(Twine(ModelStorage))) {
+      SmallString<128> TDir;
+      sys::path::system_temp_directory(true, TDir);
+      sys::path::append(TDir, Twine(ModelStorage));
+      ModelStorage.swap(TDir);
+    }
+  }
+
+  ResultPath = ModelStorage;
+  ResultPath.push_back(0);
+  ResultPath.pop_back();
+
+  // Replace '%' with random chars.
+  for (unsigned i = 0, e = ModelStorage.size(); i != e; ++i) {
+    if (ModelStorage[i] == '%')
+      ResultPath[i] = "0123456789abcdef"[sys::Process::GetRandomNumber() & 15];
+  }
+}
+
+std::error_code createUniqueFile(const Twine &Model, int &ResultFd,
+                                 SmallVectorImpl<char> &ResultPath,
+                                 unsigned Mode) {
+  return createUniqueEntity(Model, ResultFd, ResultPath, false, Mode, FS_File);
+}
+
+static std::error_code createUniqueFile(const Twine &Model, int &ResultFd,
+                                        SmallVectorImpl<char> &ResultPath,
+                                        unsigned Mode, OpenFlags Flags) {
+  return createUniqueEntity(Model, ResultFd, ResultPath, false, Mode, FS_File,
+                            Flags);
+}
+
+std::error_code createUniqueFile(const Twine &Model,
+                                 SmallVectorImpl<char> &ResultPath,
+                                 unsigned Mode) {
+  int FD;
+  auto EC = createUniqueFile(Model, FD, ResultPath, Mode);
+  if (EC)
+    return EC;
+  // FD is only needed to avoid race conditions. Close it right away.
+  close(FD);
+  return EC;
+}
+
+static std::error_code
+createTemporaryFile(const Twine &Model, int &ResultFD,
+                    llvm::SmallVectorImpl<char> &ResultPath, FSEntity Type) {
+  SmallString<128> Storage;
+  StringRef P = Model.toNullTerminatedStringRef(Storage);
+  assert(P.find_first_of(separators(Style::native)) == StringRef::npos &&
+         "Model must be a simple filename.");
+  // Use P.begin() so that createUniqueEntity doesn't need to recreate Storage.
+  return createUniqueEntity(P.begin(), ResultFD, ResultPath, true,
+                            owner_read | owner_write, Type);
+}
+
+static std::error_code
+createTemporaryFile(const Twine &Prefix, StringRef Suffix, int &ResultFD,
+                    llvm::SmallVectorImpl<char> &ResultPath, FSEntity Type) {
+  const char *Middle = Suffix.empty() ? "-%%%%%%" : "-%%%%%%.";
+  return createTemporaryFile(Prefix + Middle + Suffix, ResultFD, ResultPath,
+                             Type);
+}
+
+std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
+                                    int &ResultFD,
+                                    SmallVectorImpl<char> &ResultPath) {
+  return createTemporaryFile(Prefix, Suffix, ResultFD, ResultPath, FS_File);
+}
+
+std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix,
+                                    SmallVectorImpl<char> &ResultPath) {
+  int FD;
+  auto EC = createTemporaryFile(Prefix, Suffix, FD, ResultPath);
+  if (EC)
+    return EC;
+  // FD is only needed to avoid race conditions. Close it right away.
+  close(FD);
+  return EC;
+}
+
+
+// This is a mkdtemp with a different pattern. We use createUniqueEntity mostly
+// for consistency. We should try using mkdtemp.
+std::error_code createUniqueDirectory(const Twine &Prefix,
+                                      SmallVectorImpl<char> &ResultPath) {
+  int Dummy;
+  return createUniqueEntity(Prefix + "-%%%%%%", Dummy, ResultPath, true, 0,
+                            FS_Dir);
+}
+
+std::error_code
+getPotentiallyUniqueFileName(const Twine &Model,
+                             SmallVectorImpl<char> &ResultPath) {
+  int Dummy;
+  return createUniqueEntity(Model, Dummy, ResultPath, false, 0, FS_Name);
+}
+
+std::error_code
+getPotentiallyUniqueTempFileName(const Twine &Prefix, StringRef Suffix,
+                                 SmallVectorImpl<char> &ResultPath) {
+  int Dummy;
+  return createTemporaryFile(Prefix, Suffix, Dummy, ResultPath, FS_Name);
+}
+
+void make_absolute(const Twine &current_directory,
+                   SmallVectorImpl<char> &path) {
+  StringRef p(path.data(), path.size());
+
+  bool rootDirectory = path::has_root_directory(p);
+  bool rootName = path::has_root_name(p);
+
+  // Already absolute.
+  if ((rootName || real_style(Style::native) != Style::windows) &&
+      rootDirectory)
+    return;
+
+  // All of the following conditions will need the current directory.
+  SmallString<128> current_dir;
+  current_directory.toVector(current_dir);
+
+  // Relative path. Prepend the current directory.
+  if (!rootName && !rootDirectory) {
+    // Append path to the current directory.
+    path::append(current_dir, p);
+    // Set path to the result.
+    path.swap(current_dir);
+    return;
+  }
+
+  if (!rootName && rootDirectory) {
+    StringRef cdrn = path::root_name(current_dir);
+    SmallString<128> curDirRootName(cdrn.begin(), cdrn.end());
+    path::append(curDirRootName, p);
+    // Set path to the result.
+    path.swap(curDirRootName);
+    return;
+  }
+
+  if (rootName && !rootDirectory) {
+    StringRef pRootName      = path::root_name(p);
+    StringRef bRootDirectory = path::root_directory(current_dir);
+    StringRef bRelativePath  = path::relative_path(current_dir);
+    StringRef pRelativePath  = path::relative_path(p);
+
+    SmallString<128> res;
+    path::append(res, pRootName, bRootDirectory, bRelativePath, pRelativePath);
+    path.swap(res);
+    return;
+  }
+
+  llvm_unreachable("All rootName and rootDirectory combinations should have "
+                   "occurred above!");
+}
+
+std::error_code make_absolute(SmallVectorImpl<char> &path) {
+  if (path::is_absolute(path))
+    return {};
+
+  SmallString<128> current_dir;
+  if (std::error_code ec = current_path(current_dir))
+    return ec;
+
+  make_absolute(current_dir, path);
+  return {};
+}
+
+std::error_code create_directories(const Twine &Path, bool IgnoreExisting,
+                                   perms Perms) {
+  SmallString<128> PathStorage;
+  StringRef P = Path.toStringRef(PathStorage);
+
+  // Be optimistic and try to create the directory
+  std::error_code EC = create_directory(P, IgnoreExisting, Perms);
+  // If we succeeded, or had any error other than the parent not existing, just
+  // return it.
+  if (EC != errc::no_such_file_or_directory)
+    return EC;
+
+  // We failed because of a no_such_file_or_directory, try to create the
+  // parent.
+  StringRef Parent = path::parent_path(P);
+  if (Parent.empty())
+    return EC;
+
+  if ((EC = create_directories(Parent, IgnoreExisting, Perms)))
+      return EC;
+
+  return create_directory(P, IgnoreExisting, Perms);
+}
+
+static std::error_code copy_file_internal(int ReadFD, int WriteFD) {
+  const size_t BufSize = 4096;
+  char *Buf = new char[BufSize];
+  int BytesRead = 0, BytesWritten = 0;
+  for (;;) {
+    BytesRead = read(ReadFD, Buf, BufSize);
+    if (BytesRead <= 0)
+      break;
+    while (BytesRead) {
+      BytesWritten = write(WriteFD, Buf, BytesRead);
+      if (BytesWritten < 0)
+        break;
+      BytesRead -= BytesWritten;
+    }
+    if (BytesWritten < 0)
+      break;
+  }
+  delete[] Buf;
+
+  if (BytesRead < 0 || BytesWritten < 0)
+    return std::error_code(errno, std::generic_category());
+  return std::error_code();
+}
+
+#ifndef __APPLE__
+std::error_code copy_file(const Twine &From, const Twine &To) {
+  int ReadFD, WriteFD;
+  if (std::error_code EC = openFileForRead(From, ReadFD, OF_None))
+    return EC;
+  if (std::error_code EC =
+          openFileForWrite(To, WriteFD, CD_CreateAlways, OF_None)) {
+    close(ReadFD);
+    return EC;
+  }
+
+  std::error_code EC = copy_file_internal(ReadFD, WriteFD);
+
+  close(ReadFD);
+  close(WriteFD);
+
+  return EC;
+}
+#endif
+
+std::error_code copy_file(const Twine &From, int ToFD) {
+  int ReadFD;
+  if (std::error_code EC = openFileForRead(From, ReadFD, OF_None))
+    return EC;
+
+  std::error_code EC = copy_file_internal(ReadFD, ToFD);
+
+  close(ReadFD);
+
+  return EC;
+}
+
+ErrorOr<MD5::MD5Result> md5_contents(int FD) {
+  MD5 Hash;
+
+  constexpr size_t BufSize = 4096;
+  std::vector<uint8_t> Buf(BufSize);
+  int BytesRead = 0;
+  for (;;) {
+    BytesRead = read(FD, Buf.data(), BufSize);
+    if (BytesRead <= 0)
+      break;
+    Hash.update(makeArrayRef(Buf.data(), BytesRead));
+  }
+
+  if (BytesRead < 0)
+    return std::error_code(errno, std::generic_category());
+  MD5::MD5Result Result;
+  Hash.final(Result);
+  return Result;
+}
+
+ErrorOr<MD5::MD5Result> md5_contents(const Twine &Path) {
+  int FD;
+  if (auto EC = openFileForRead(Path, FD, OF_None))
+    return EC;
+
+  auto Result = md5_contents(FD);
+  close(FD);
+  return Result;
+}
+
+bool exists(const basic_file_status &status) {
+  return status_known(status) && status.type() != file_type::file_not_found;
+}
+
+bool status_known(const basic_file_status &s) {
+  return s.type() != file_type::status_error;
+}
+
+file_type get_file_type(const Twine &Path, bool Follow) {
+  file_status st;
+  if (status(Path, st, Follow))
+    return file_type::status_error;
+  return st.type();
+}
+
+bool is_directory(const basic_file_status &status) {
+  return status.type() == file_type::directory_file;
+}
+
+std::error_code is_directory(const Twine &path, bool &result) {
+  file_status st;
+  if (std::error_code ec = status(path, st))
+    return ec;
+  result = is_directory(st);
+  return std::error_code();
+}
+
+bool is_regular_file(const basic_file_status &status) {
+  return status.type() == file_type::regular_file;
+}
+
+std::error_code is_regular_file(const Twine &path, bool &result) {
+  file_status st;
+  if (std::error_code ec = status(path, st))
+    return ec;
+  result = is_regular_file(st);
+  return std::error_code();
+}
+
+bool is_symlink_file(const basic_file_status &status) {
+  return status.type() == file_type::symlink_file;
+}
+
+std::error_code is_symlink_file(const Twine &path, bool &result) {
+  file_status st;
+  if (std::error_code ec = status(path, st, false))
+    return ec;
+  result = is_symlink_file(st);
+  return std::error_code();
+}
+
+bool is_other(const basic_file_status &status) {
+  return exists(status) &&
+         !is_regular_file(status) &&
+         !is_directory(status);
+}
+
+std::error_code is_other(const Twine &Path, bool &Result) {
+  file_status FileStatus;
+  if (std::error_code EC = status(Path, FileStatus))
+    return EC;
+  Result = is_other(FileStatus);
+  return std::error_code();
+}
+
+void directory_entry::replace_filename(const Twine &Filename, file_type Type,
+                                       basic_file_status Status) {
+  SmallString<128> PathStr = path::parent_path(Path);
+  path::append(PathStr, Filename);
+  this->Path = std::string(PathStr.str());
+  this->Type = Type;
+  this->Status = Status;
+}
+
+ErrorOr<perms> getPermissions(const Twine &Path) {
+  file_status Status;
+  if (std::error_code EC = status(Path, Status))
+    return EC;
+
+  return Status.permissions();
+}
+
+} // end namespace fs
+} // end namespace sys
+} // end namespace llvm
+
+// Include the truly platform-specific parts.
+#if defined(LLVM_ON_UNIX)
+#include "Unix/Path.inc"
+#endif
+#if defined(_WIN32)
+#include "Windows/Path.inc"
+#endif
+
+namespace llvm {
+namespace sys {
+namespace fs {
+TempFile::TempFile(StringRef Name, int FD)
+    : TmpName(std::string(Name)), FD(FD) {}
+TempFile::TempFile(TempFile &&Other) { *this = std::move(Other); }
+TempFile &TempFile::operator=(TempFile &&Other) {
+  TmpName = std::move(Other.TmpName);
+  FD = Other.FD;
+  Other.Done = true;
+  Other.FD = -1;
+  return *this;
+}
+
+TempFile::~TempFile() { assert(Done); }
+
+Error TempFile::discard() {
+  Done = true;
+  if (FD != -1 && close(FD) == -1) {
+    std::error_code EC = std::error_code(errno, std::generic_category());
+    return errorCodeToError(EC);
+  }
+  FD = -1;
+
+#ifdef _WIN32
+  // On windows closing will remove the file.
+  TmpName = "";
+  return Error::success();
+#else
+  // Always try to close and remove.
+  std::error_code RemoveEC;
+  if (!TmpName.empty()) {
+    RemoveEC = fs::remove(TmpName);
+    sys::DontRemoveFileOnSignal(TmpName);
+    if (!RemoveEC)
+      TmpName = "";
+  }
+  return errorCodeToError(RemoveEC);
+#endif
+}
+
+Error TempFile::keep(const Twine &Name) {
+  assert(!Done);
+  Done = true;
+  // Always try to close and rename.
+#ifdef _WIN32
+  // If we can't cancel the delete don't rename.
+  auto H = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
+  std::error_code RenameEC = setDeleteDisposition(H, false);
+  if (!RenameEC) {
+    RenameEC = rename_fd(FD, Name);
+    // If rename failed because it's cross-device, copy instead
+    if (RenameEC ==
+      std::error_code(ERROR_NOT_SAME_DEVICE, std::system_category())) {
+      RenameEC = copy_file(TmpName, Name);
+      setDeleteDisposition(H, true);
+    }
+  }
+
+  // If we can't rename, discard the temporary file.
+  if (RenameEC)
+    setDeleteDisposition(H, true);
+#else
+  std::error_code RenameEC = fs::rename(TmpName, Name);
+  if (RenameEC) {
+    // If we can't rename, try to copy to work around cross-device link issues.
+    RenameEC = sys::fs::copy_file(TmpName, Name);
+    // If we can't rename or copy, discard the temporary file.
+    if (RenameEC)
+      remove(TmpName);
+  }
+  sys::DontRemoveFileOnSignal(TmpName);
+#endif
+
+  if (!RenameEC)
+    TmpName = "";
+
+  if (close(FD) == -1) {
+    std::error_code EC(errno, std::generic_category());
+    return errorCodeToError(EC);
+  }
+  FD = -1;
+
+  return errorCodeToError(RenameEC);
+}
+
+Error TempFile::keep() {
+  assert(!Done);
+  Done = true;
+
+#ifdef _WIN32
+  auto H = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
+  if (std::error_code EC = setDeleteDisposition(H, false))
+    return errorCodeToError(EC);
+#else
+  sys::DontRemoveFileOnSignal(TmpName);
+#endif
+
+  TmpName = "";
+
+  if (close(FD) == -1) {
+    std::error_code EC(errno, std::generic_category());
+    return errorCodeToError(EC);
+  }
+  FD = -1;
+
+  return Error::success();
+}
+
+Expected<TempFile> TempFile::create(const Twine &Model, unsigned Mode) {
+  int FD;
+  SmallString<128> ResultPath;
+  if (std::error_code EC =
+          createUniqueFile(Model, FD, ResultPath, Mode, OF_Delete))
+    return errorCodeToError(EC);
+
+  TempFile Ret(ResultPath, FD);
+#ifndef _WIN32
+  if (sys::RemoveFileOnSignal(ResultPath)) {
+    // Make sure we delete the file when RemoveFileOnSignal fails.
+    consumeError(Ret.discard());
+    std::error_code EC(errc::operation_not_permitted);
+    return errorCodeToError(EC);
+  }
+#endif
+  return std::move(Ret);
+}
 } // namespace fs
- 
+
 } // namespace sys
 } // namespace llvm