Restoring authorship annotation for <[email protected]>. Commit 1 of 2.

1 files changed, 332 insertions, 332 deletions

diff --git a/contrib/libs/llvm12/lib/Support/FileUtilities.cpp b/contrib/libs/llvm12/lib/Support/FileUtilities.cpp
index e4a86bb69de..93db69dd9e2 100644
--- a/contrib/libs/llvm12/lib/Support/FileUtilities.cpp
+++ b/contrib/libs/llvm12/lib/Support/FileUtilities.cpp
@@ -1,332 +1,332 @@
-//===- Support/FileUtilities.cpp - File System Utilities ------------------===//
-//
-// 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 a family of utility functions which are useful for doing
-// various things with files.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Support/FileUtilities.h"
-#include "llvm/ADT/ScopeExit.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/ADT/StringExtras.h"
-#include "llvm/Support/Error.h"
-#include "llvm/Support/ErrorOr.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/Path.h"
-#include "llvm/Support/raw_ostream.h"
-#include <cctype>
-#include <cmath>
-#include <cstdint>
-#include <cstdlib>
-#include <cstring>
-#include <memory>
-#include <system_error>
-
-using namespace llvm;
-
-static bool isSignedChar(char C) {
-  return (C == '+' || C == '-');
-}
-
-static bool isExponentChar(char C) {
-  switch (C) {
-  case 'D':  // Strange exponential notation.
-  case 'd':  // Strange exponential notation.
-  case 'e':
-  case 'E': return true;
-  default: return false;
-  }
-}
-
-static bool isNumberChar(char C) {
-  switch (C) {
-  case '0': case '1': case '2': case '3': case '4':
-  case '5': case '6': case '7': case '8': case '9':
-  case '.': return true;
-  default: return isSignedChar(C) || isExponentChar(C);
-  }
-}
-
-static const char *BackupNumber(const char *Pos, const char *FirstChar) {
-  // If we didn't stop in the middle of a number, don't backup.
-  if (!isNumberChar(*Pos)) return Pos;
-
-  // Otherwise, return to the start of the number.
-  bool HasPeriod = false;
-  while (Pos > FirstChar && isNumberChar(Pos[-1])) {
-    // Backup over at most one period.
-    if (Pos[-1] == '.') {
-      if (HasPeriod)
-        break;
-      HasPeriod = true;
-    }
-
-    --Pos;
-    if (Pos > FirstChar && isSignedChar(Pos[0]) && !isExponentChar(Pos[-1]))
-      break;
-  }
-  return Pos;
-}
-
-/// EndOfNumber - Return the first character that is not part of the specified
-/// number.  This assumes that the buffer is null terminated, so it won't fall
-/// off the end.
-static const char *EndOfNumber(const char *Pos) {
-  while (isNumberChar(*Pos))
-    ++Pos;
-  return Pos;
-}
-
-/// CompareNumbers - compare two numbers, returning true if they are different.
-static bool CompareNumbers(const char *&F1P, const char *&F2P,
-                           const char *F1End, const char *F2End,
-                           double AbsTolerance, double RelTolerance,
-                           std::string *ErrorMsg) {
-  const char *F1NumEnd, *F2NumEnd;
-  double V1 = 0.0, V2 = 0.0;
-
-  // If one of the positions is at a space and the other isn't, chomp up 'til
-  // the end of the space.
-  while (isSpace(static_cast<unsigned char>(*F1P)) && F1P != F1End)
-    ++F1P;
-  while (isSpace(static_cast<unsigned char>(*F2P)) && F2P != F2End)
-    ++F2P;
-
-  // If we stop on numbers, compare their difference.
-  if (!isNumberChar(*F1P) || !isNumberChar(*F2P)) {
-    // The diff failed.
-    F1NumEnd = F1P;
-    F2NumEnd = F2P;
-  } else {
-    // Note that some ugliness is built into this to permit support for numbers
-    // that use "D" or "d" as their exponential marker, e.g. "1.234D45".  This
-    // occurs in 200.sixtrack in spec2k.
-    V1 = strtod(F1P, const_cast<char**>(&F1NumEnd));
-    V2 = strtod(F2P, const_cast<char**>(&F2NumEnd));
-
-    if (*F1NumEnd == 'D' || *F1NumEnd == 'd') {
-      // Copy string into tmp buffer to replace the 'D' with an 'e'.
-      SmallString<200> StrTmp(F1P, EndOfNumber(F1NumEnd)+1);
-      // Strange exponential notation!
-      StrTmp[static_cast<unsigned>(F1NumEnd-F1P)] = 'e';
-
-      V1 = strtod(&StrTmp[0], const_cast<char**>(&F1NumEnd));
-      F1NumEnd = F1P + (F1NumEnd-&StrTmp[0]);
-    }
-
-    if (*F2NumEnd == 'D' || *F2NumEnd == 'd') {
-      // Copy string into tmp buffer to replace the 'D' with an 'e'.
-      SmallString<200> StrTmp(F2P, EndOfNumber(F2NumEnd)+1);
-      // Strange exponential notation!
-      StrTmp[static_cast<unsigned>(F2NumEnd-F2P)] = 'e';
-
-      V2 = strtod(&StrTmp[0], const_cast<char**>(&F2NumEnd));
-      F2NumEnd = F2P + (F2NumEnd-&StrTmp[0]);
-    }
-  }
-
-  if (F1NumEnd == F1P || F2NumEnd == F2P) {
-    if (ErrorMsg) {
-      *ErrorMsg = "FP Comparison failed, not a numeric difference between '";
-      *ErrorMsg += F1P[0];
-      *ErrorMsg += "' and '";
-      *ErrorMsg += F2P[0];
-      *ErrorMsg += "'";
-    }
-    return true;
-  }
-
-  // Check to see if these are inside the absolute tolerance
-  if (AbsTolerance < std::abs(V1-V2)) {
-    // Nope, check the relative tolerance...
-    double Diff;
-    if (V2)
-      Diff = std::abs(V1/V2 - 1.0);
-    else if (V1)
-      Diff = std::abs(V2/V1 - 1.0);
-    else
-      Diff = 0;  // Both zero.
-    if (Diff > RelTolerance) {
-      if (ErrorMsg) {
-        raw_string_ostream(*ErrorMsg)
-          << "Compared: " << V1 << " and " << V2 << '\n'
-          << "abs. diff = " << std::abs(V1-V2) << " rel.diff = " << Diff << '\n'
-          << "Out of tolerance: rel/abs: " << RelTolerance << '/'
-          << AbsTolerance;
-      }
-      return true;
-    }
-  }
-
-  // Otherwise, advance our read pointers to the end of the numbers.
-  F1P = F1NumEnd;  F2P = F2NumEnd;
-  return false;
-}
-
-/// DiffFilesWithTolerance - Compare the two files specified, returning 0 if the
-/// files match, 1 if they are different, and 2 if there is a file error.  This
-/// function differs from DiffFiles in that you can specify an absolete and
-/// relative FP error that is allowed to exist.  If you specify a string to fill
-/// in for the error option, it will set the string to an error message if an
-/// error occurs, allowing the caller to distinguish between a failed diff and a
-/// file system error.
-///
-int llvm::DiffFilesWithTolerance(StringRef NameA,
-                                 StringRef NameB,
-                                 double AbsTol, double RelTol,
-                                 std::string *Error) {
-  // Now its safe to mmap the files into memory because both files
-  // have a non-zero size.
-  ErrorOr<std::unique_ptr<MemoryBuffer>> F1OrErr = MemoryBuffer::getFile(NameA);
-  if (std::error_code EC = F1OrErr.getError()) {
-    if (Error)
-      *Error = EC.message();
-    return 2;
-  }
-  MemoryBuffer &F1 = *F1OrErr.get();
-
-  ErrorOr<std::unique_ptr<MemoryBuffer>> F2OrErr = MemoryBuffer::getFile(NameB);
-  if (std::error_code EC = F2OrErr.getError()) {
-    if (Error)
-      *Error = EC.message();
-    return 2;
-  }
-  MemoryBuffer &F2 = *F2OrErr.get();
-
-  // Okay, now that we opened the files, scan them for the first difference.
-  const char *File1Start = F1.getBufferStart();
-  const char *File2Start = F2.getBufferStart();
-  const char *File1End = F1.getBufferEnd();
-  const char *File2End = F2.getBufferEnd();
-  const char *F1P = File1Start;
-  const char *F2P = File2Start;
-  uint64_t A_size = F1.getBufferSize();
-  uint64_t B_size = F2.getBufferSize();
-
-  // Are the buffers identical?  Common case: Handle this efficiently.
-  if (A_size == B_size &&
-      std::memcmp(File1Start, File2Start, A_size) == 0)
-    return 0;
-
-  // Otherwise, we are done a tolerances are set.
-  if (AbsTol == 0 && RelTol == 0) {
-    if (Error)
-      *Error = "Files differ without tolerance allowance";
-    return 1;   // Files different!
-  }
-
-  bool CompareFailed = false;
-  while (true) {
-    // Scan for the end of file or next difference.
-    while (F1P < File1End && F2P < File2End && *F1P == *F2P) {
-      ++F1P;
-      ++F2P;
-    }
-
-    if (F1P >= File1End || F2P >= File2End) break;
-
-    // Okay, we must have found a difference.  Backup to the start of the
-    // current number each stream is at so that we can compare from the
-    // beginning.
-    F1P = BackupNumber(F1P, File1Start);
-    F2P = BackupNumber(F2P, File2Start);
-
-    // Now that we are at the start of the numbers, compare them, exiting if
-    // they don't match.
-    if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) {
-      CompareFailed = true;
-      break;
-    }
-  }
-
-  // Okay, we reached the end of file.  If both files are at the end, we
-  // succeeded.
-  bool F1AtEnd = F1P >= File1End;
-  bool F2AtEnd = F2P >= File2End;
-  if (!CompareFailed && (!F1AtEnd || !F2AtEnd)) {
-    // Else, we might have run off the end due to a number: backup and retry.
-    if (F1AtEnd && isNumberChar(F1P[-1])) --F1P;
-    if (F2AtEnd && isNumberChar(F2P[-1])) --F2P;
-    F1P = BackupNumber(F1P, File1Start);
-    F2P = BackupNumber(F2P, File2Start);
-
-    // Now that we are at the start of the numbers, compare them, exiting if
-    // they don't match.
-    if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error))
-      CompareFailed = true;
-
-    // If we found the end, we succeeded.
-    if (F1P < File1End || F2P < File2End)
-      CompareFailed = true;
-  }
-
-  return CompareFailed;
-}
-
-void llvm::AtomicFileWriteError::log(raw_ostream &OS) const {
-  OS << "atomic_write_error: ";
-  switch (Error) {
-  case atomic_write_error::failed_to_create_uniq_file:
-    OS << "failed_to_create_uniq_file";
-    return;
-  case atomic_write_error::output_stream_error:
-    OS << "output_stream_error";
-    return;
-  case atomic_write_error::failed_to_rename_temp_file:
-    OS << "failed_to_rename_temp_file";
-    return;
-  }
-  llvm_unreachable("unknown atomic_write_error value in "
-                   "failed_to_rename_temp_file::log()");
-}
-
-llvm::Error llvm::writeFileAtomically(StringRef TempPathModel,
-                                      StringRef FinalPath, StringRef Buffer) {
-  return writeFileAtomically(TempPathModel, FinalPath,
-                             [&Buffer](llvm::raw_ostream &OS) {
-                               OS.write(Buffer.data(), Buffer.size());
-                               return llvm::Error::success();
-                             });
-}
-
-llvm::Error llvm::writeFileAtomically(
-    StringRef TempPathModel, StringRef FinalPath,
-    std::function<llvm::Error(llvm::raw_ostream &)> Writer) {
-  SmallString<128> GeneratedUniqPath;
-  int TempFD;
-  if (sys::fs::createUniqueFile(TempPathModel.str(), TempFD,
-                                GeneratedUniqPath)) {
-    return llvm::make_error<AtomicFileWriteError>(
-        atomic_write_error::failed_to_create_uniq_file);
-  }
-  llvm::FileRemover RemoveTmpFileOnFail(GeneratedUniqPath);
-
-  raw_fd_ostream OS(TempFD, /*shouldClose=*/true);
-  if (llvm::Error Err = Writer(OS)) {
-    return Err;
-  }
-
-  OS.close();
-  if (OS.has_error()) {
-    OS.clear_error();
-    return llvm::make_error<AtomicFileWriteError>(
-        atomic_write_error::output_stream_error);
-  }
-
-  if (sys::fs::rename(/*from=*/GeneratedUniqPath.c_str(),
-                      /*to=*/FinalPath.str().c_str())) {
-    return llvm::make_error<AtomicFileWriteError>(
-        atomic_write_error::failed_to_rename_temp_file);
-  }
-
-  RemoveTmpFileOnFail.releaseFile();
-  return Error::success();
-}
-
-char llvm::AtomicFileWriteError::ID;
+//===- Support/FileUtilities.cpp - File System Utilities ------------------===// 
+// 
+// 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 a family of utility functions which are useful for doing 
+// various things with files. 
+// 
+//===----------------------------------------------------------------------===// 
+ 
+#include "llvm/Support/FileUtilities.h" 
+#include "llvm/ADT/ScopeExit.h" 
+#include "llvm/ADT/SmallString.h" 
+#include "llvm/ADT/StringExtras.h" 
+#include "llvm/Support/Error.h" 
+#include "llvm/Support/ErrorOr.h" 
+#include "llvm/Support/MemoryBuffer.h" 
+#include "llvm/Support/Path.h" 
+#include "llvm/Support/raw_ostream.h" 
+#include <cctype> 
+#include <cmath> 
+#include <cstdint> 
+#include <cstdlib> 
+#include <cstring> 
+#include <memory> 
+#include <system_error> 
+ 
+using namespace llvm; 
+ 
+static bool isSignedChar(char C) { 
+  return (C == '+' || C == '-'); 
+} 
+ 
+static bool isExponentChar(char C) { 
+  switch (C) { 
+  case 'D':  // Strange exponential notation. 
+  case 'd':  // Strange exponential notation. 
+  case 'e': 
+  case 'E': return true; 
+  default: return false; 
+  } 
+} 
+ 
+static bool isNumberChar(char C) { 
+  switch (C) { 
+  case '0': case '1': case '2': case '3': case '4': 
+  case '5': case '6': case '7': case '8': case '9': 
+  case '.': return true; 
+  default: return isSignedChar(C) || isExponentChar(C); 
+  } 
+} 
+ 
+static const char *BackupNumber(const char *Pos, const char *FirstChar) { 
+  // If we didn't stop in the middle of a number, don't backup. 
+  if (!isNumberChar(*Pos)) return Pos; 
+ 
+  // Otherwise, return to the start of the number. 
+  bool HasPeriod = false; 
+  while (Pos > FirstChar && isNumberChar(Pos[-1])) { 
+    // Backup over at most one period. 
+    if (Pos[-1] == '.') { 
+      if (HasPeriod) 
+        break; 
+      HasPeriod = true; 
+    } 
+ 
+    --Pos; 
+    if (Pos > FirstChar && isSignedChar(Pos[0]) && !isExponentChar(Pos[-1])) 
+      break; 
+  } 
+  return Pos; 
+} 
+ 
+/// EndOfNumber - Return the first character that is not part of the specified 
+/// number.  This assumes that the buffer is null terminated, so it won't fall 
+/// off the end. 
+static const char *EndOfNumber(const char *Pos) { 
+  while (isNumberChar(*Pos)) 
+    ++Pos; 
+  return Pos; 
+} 
+ 
+/// CompareNumbers - compare two numbers, returning true if they are different. 
+static bool CompareNumbers(const char *&F1P, const char *&F2P, 
+                           const char *F1End, const char *F2End, 
+                           double AbsTolerance, double RelTolerance, 
+                           std::string *ErrorMsg) { 
+  const char *F1NumEnd, *F2NumEnd; 
+  double V1 = 0.0, V2 = 0.0; 
+ 
+  // If one of the positions is at a space and the other isn't, chomp up 'til 
+  // the end of the space. 
+  while (isSpace(static_cast<unsigned char>(*F1P)) && F1P != F1End) 
+    ++F1P; 
+  while (isSpace(static_cast<unsigned char>(*F2P)) && F2P != F2End) 
+    ++F2P; 
+ 
+  // If we stop on numbers, compare their difference. 
+  if (!isNumberChar(*F1P) || !isNumberChar(*F2P)) { 
+    // The diff failed. 
+    F1NumEnd = F1P; 
+    F2NumEnd = F2P; 
+  } else { 
+    // Note that some ugliness is built into this to permit support for numbers 
+    // that use "D" or "d" as their exponential marker, e.g. "1.234D45".  This 
+    // occurs in 200.sixtrack in spec2k. 
+    V1 = strtod(F1P, const_cast<char**>(&F1NumEnd)); 
+    V2 = strtod(F2P, const_cast<char**>(&F2NumEnd)); 
+ 
+    if (*F1NumEnd == 'D' || *F1NumEnd == 'd') { 
+      // Copy string into tmp buffer to replace the 'D' with an 'e'. 
+      SmallString<200> StrTmp(F1P, EndOfNumber(F1NumEnd)+1); 
+      // Strange exponential notation! 
+      StrTmp[static_cast<unsigned>(F1NumEnd-F1P)] = 'e'; 
+ 
+      V1 = strtod(&StrTmp[0], const_cast<char**>(&F1NumEnd)); 
+      F1NumEnd = F1P + (F1NumEnd-&StrTmp[0]); 
+    } 
+ 
+    if (*F2NumEnd == 'D' || *F2NumEnd == 'd') { 
+      // Copy string into tmp buffer to replace the 'D' with an 'e'. 
+      SmallString<200> StrTmp(F2P, EndOfNumber(F2NumEnd)+1); 
+      // Strange exponential notation! 
+      StrTmp[static_cast<unsigned>(F2NumEnd-F2P)] = 'e'; 
+ 
+      V2 = strtod(&StrTmp[0], const_cast<char**>(&F2NumEnd)); 
+      F2NumEnd = F2P + (F2NumEnd-&StrTmp[0]); 
+    } 
+  } 
+ 
+  if (F1NumEnd == F1P || F2NumEnd == F2P) { 
+    if (ErrorMsg) { 
+      *ErrorMsg = "FP Comparison failed, not a numeric difference between '"; 
+      *ErrorMsg += F1P[0]; 
+      *ErrorMsg += "' and '"; 
+      *ErrorMsg += F2P[0]; 
+      *ErrorMsg += "'"; 
+    } 
+    return true; 
+  } 
+ 
+  // Check to see if these are inside the absolute tolerance 
+  if (AbsTolerance < std::abs(V1-V2)) { 
+    // Nope, check the relative tolerance... 
+    double Diff; 
+    if (V2) 
+      Diff = std::abs(V1/V2 - 1.0); 
+    else if (V1) 
+      Diff = std::abs(V2/V1 - 1.0); 
+    else 
+      Diff = 0;  // Both zero. 
+    if (Diff > RelTolerance) { 
+      if (ErrorMsg) { 
+        raw_string_ostream(*ErrorMsg) 
+          << "Compared: " << V1 << " and " << V2 << '\n' 
+          << "abs. diff = " << std::abs(V1-V2) << " rel.diff = " << Diff << '\n' 
+          << "Out of tolerance: rel/abs: " << RelTolerance << '/' 
+          << AbsTolerance; 
+      } 
+      return true; 
+    } 
+  } 
+ 
+  // Otherwise, advance our read pointers to the end of the numbers. 
+  F1P = F1NumEnd;  F2P = F2NumEnd; 
+  return false; 
+} 
+ 
+/// DiffFilesWithTolerance - Compare the two files specified, returning 0 if the 
+/// files match, 1 if they are different, and 2 if there is a file error.  This 
+/// function differs from DiffFiles in that you can specify an absolete and 
+/// relative FP error that is allowed to exist.  If you specify a string to fill 
+/// in for the error option, it will set the string to an error message if an 
+/// error occurs, allowing the caller to distinguish between a failed diff and a 
+/// file system error. 
+/// 
+int llvm::DiffFilesWithTolerance(StringRef NameA, 
+                                 StringRef NameB, 
+                                 double AbsTol, double RelTol, 
+                                 std::string *Error) { 
+  // Now its safe to mmap the files into memory because both files 
+  // have a non-zero size. 
+  ErrorOr<std::unique_ptr<MemoryBuffer>> F1OrErr = MemoryBuffer::getFile(NameA); 
+  if (std::error_code EC = F1OrErr.getError()) { 
+    if (Error) 
+      *Error = EC.message(); 
+    return 2; 
+  } 
+  MemoryBuffer &F1 = *F1OrErr.get(); 
+ 
+  ErrorOr<std::unique_ptr<MemoryBuffer>> F2OrErr = MemoryBuffer::getFile(NameB); 
+  if (std::error_code EC = F2OrErr.getError()) { 
+    if (Error) 
+      *Error = EC.message(); 
+    return 2; 
+  } 
+  MemoryBuffer &F2 = *F2OrErr.get(); 
+ 
+  // Okay, now that we opened the files, scan them for the first difference. 
+  const char *File1Start = F1.getBufferStart(); 
+  const char *File2Start = F2.getBufferStart(); 
+  const char *File1End = F1.getBufferEnd(); 
+  const char *File2End = F2.getBufferEnd(); 
+  const char *F1P = File1Start; 
+  const char *F2P = File2Start; 
+  uint64_t A_size = F1.getBufferSize(); 
+  uint64_t B_size = F2.getBufferSize(); 
+ 
+  // Are the buffers identical?  Common case: Handle this efficiently. 
+  if (A_size == B_size && 
+      std::memcmp(File1Start, File2Start, A_size) == 0) 
+    return 0; 
+ 
+  // Otherwise, we are done a tolerances are set. 
+  if (AbsTol == 0 && RelTol == 0) { 
+    if (Error) 
+      *Error = "Files differ without tolerance allowance"; 
+    return 1;   // Files different! 
+  } 
+ 
+  bool CompareFailed = false; 
+  while (true) { 
+    // Scan for the end of file or next difference. 
+    while (F1P < File1End && F2P < File2End && *F1P == *F2P) { 
+      ++F1P; 
+      ++F2P; 
+    } 
+ 
+    if (F1P >= File1End || F2P >= File2End) break; 
+ 
+    // Okay, we must have found a difference.  Backup to the start of the 
+    // current number each stream is at so that we can compare from the 
+    // beginning. 
+    F1P = BackupNumber(F1P, File1Start); 
+    F2P = BackupNumber(F2P, File2Start); 
+ 
+    // Now that we are at the start of the numbers, compare them, exiting if 
+    // they don't match. 
+    if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) { 
+      CompareFailed = true; 
+      break; 
+    } 
+  } 
+ 
+  // Okay, we reached the end of file.  If both files are at the end, we 
+  // succeeded. 
+  bool F1AtEnd = F1P >= File1End; 
+  bool F2AtEnd = F2P >= File2End; 
+  if (!CompareFailed && (!F1AtEnd || !F2AtEnd)) { 
+    // Else, we might have run off the end due to a number: backup and retry. 
+    if (F1AtEnd && isNumberChar(F1P[-1])) --F1P; 
+    if (F2AtEnd && isNumberChar(F2P[-1])) --F2P; 
+    F1P = BackupNumber(F1P, File1Start); 
+    F2P = BackupNumber(F2P, File2Start); 
+ 
+    // Now that we are at the start of the numbers, compare them, exiting if 
+    // they don't match. 
+    if (CompareNumbers(F1P, F2P, File1End, File2End, AbsTol, RelTol, Error)) 
+      CompareFailed = true; 
+ 
+    // If we found the end, we succeeded. 
+    if (F1P < File1End || F2P < File2End) 
+      CompareFailed = true; 
+  } 
+ 
+  return CompareFailed; 
+} 
+ 
+void llvm::AtomicFileWriteError::log(raw_ostream &OS) const { 
+  OS << "atomic_write_error: "; 
+  switch (Error) { 
+  case atomic_write_error::failed_to_create_uniq_file: 
+    OS << "failed_to_create_uniq_file"; 
+    return; 
+  case atomic_write_error::output_stream_error: 
+    OS << "output_stream_error"; 
+    return; 
+  case atomic_write_error::failed_to_rename_temp_file: 
+    OS << "failed_to_rename_temp_file"; 
+    return; 
+  } 
+  llvm_unreachable("unknown atomic_write_error value in " 
+                   "failed_to_rename_temp_file::log()"); 
+} 
+ 
+llvm::Error llvm::writeFileAtomically(StringRef TempPathModel, 
+                                      StringRef FinalPath, StringRef Buffer) { 
+  return writeFileAtomically(TempPathModel, FinalPath, 
+                             [&Buffer](llvm::raw_ostream &OS) { 
+                               OS.write(Buffer.data(), Buffer.size()); 
+                               return llvm::Error::success(); 
+                             }); 
+} 
+ 
+llvm::Error llvm::writeFileAtomically( 
+    StringRef TempPathModel, StringRef FinalPath, 
+    std::function<llvm::Error(llvm::raw_ostream &)> Writer) { 
+  SmallString<128> GeneratedUniqPath; 
+  int TempFD; 
+  if (sys::fs::createUniqueFile(TempPathModel.str(), TempFD, 
+                                GeneratedUniqPath)) { 
+    return llvm::make_error<AtomicFileWriteError>( 
+        atomic_write_error::failed_to_create_uniq_file); 
+  } 
+  llvm::FileRemover RemoveTmpFileOnFail(GeneratedUniqPath); 
+ 
+  raw_fd_ostream OS(TempFD, /*shouldClose=*/true); 
+  if (llvm::Error Err = Writer(OS)) { 
+    return Err; 
+  } 
+ 
+  OS.close(); 
+  if (OS.has_error()) { 
+    OS.clear_error(); 
+    return llvm::make_error<AtomicFileWriteError>( 
+        atomic_write_error::output_stream_error); 
+  } 
+ 
+  if (sys::fs::rename(/*from=*/GeneratedUniqPath.c_str(), 
+                      /*to=*/FinalPath.str().c_str())) { 
+    return llvm::make_error<AtomicFileWriteError>( 
+        atomic_write_error::failed_to_rename_temp_file); 
+  } 
+ 
+  RemoveTmpFileOnFail.releaseFile(); 
+  return Error::success(); 
+} 
+ 
+char llvm::AtomicFileWriteError::ID;