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📄 AArch64TargetParser.cpp(8 KB)
📄 ABIBreak.cpp(811 B)
📄 AMDGPUMetadata.cpp(9.37 KB)
📄 APFloat.cpp(155.26 KB)
📄 APInt.cpp(98.08 KB)
📄 APSInt.cpp(1.44 KB)
📄 ARMAttributeParser.cpp(13.94 KB)
📄 ARMBuildAttrs.cpp(3.45 KB)
📄 ARMTargetParser.cpp(18.09 KB)
📄 ARMWinEH.cpp(1.08 KB)
📄 Allocator.cpp(1.35 KB)
📄 Atomic.cpp(1.6 KB)
📄 BinaryStreamError.cpp(1.76 KB)
📄 BinaryStreamReader.cpp(5.24 KB)
📄 BinaryStreamRef.cpp(4.76 KB)
📄 BinaryStreamWriter.cpp(3.36 KB)
📄 BlockFrequency.cpp(2.12 KB)
📄 BranchProbability.cpp(3.44 KB)
📄 BuryPointer.cpp(1.11 KB)
📄 COM.cpp(737 B)
📄 COPYRIGHT.regex(2.65 KB)
📄 CRC.cpp(5.23 KB)
📄 CachePruning.cpp(10.33 KB)
📄 Chrono.cpp(3.17 KB)
📄 CodeGenCoverage.cpp(3.61 KB)
📄 CommandLine.cpp(89.06 KB)
📄 Compression.cpp(3.84 KB)
📄 ConvertUTF.cpp(27.27 KB)
📄 ConvertUTFWrapper.cpp(8.66 KB)
📄 CrashRecoveryContext.cpp(15.45 KB)
📄 DAGDeltaAlgorithm.cpp(12.47 KB)
📄 DJB.cpp(2.71 KB)
📄 DataExtractor.cpp(7.25 KB)
📄 Debug.cpp(5.64 KB)
📄 DebugCounter.cpp(4.95 KB)
📄 DeltaAlgorithm.cpp(3.41 KB)
📄 DynamicLibrary.cpp(6.25 KB)
📄 ELFAttributeParser.cpp(7.27 KB)
📄 ELFAttributes.cpp(1.27 KB)
📄 Errno.cpp(2.18 KB)
📄 Error.cpp(4.72 KB)
📄 ErrorHandling.cpp(11.08 KB)
📄 ExtensibleRTTI.cpp(446 B)
📄 FileCheck.cpp(95.77 KB)
📄 FileCheckImpl.h(34.14 KB)
📄 FileCollector.cpp(9.01 KB)
📄 FileOutputBuffer.cpp(6.62 KB)
📄 FileUtilities.cpp(10.81 KB)
📄 FoldingSet.cpp(15.89 KB)
📄 FormatVariadic.cpp(5.17 KB)
📄 FormattedStream.cpp(5.29 KB)
📄 GlobPattern.cpp(5 KB)
📄 GraphWriter.cpp(9.21 KB)
📄 Hashing.cpp(1.16 KB)
📄 Host.cpp(51.63 KB)
📄 InitLLVM.cpp(1.92 KB)
📄 IntEqClasses.cpp(2.18 KB)
📄 IntervalMap.cpp(4.4 KB)
📄 ItaniumManglingCanonicalizer.cpp(10.77 KB)
📄 JSON.cpp(19.1 KB)
📄 KnownBits.cpp(3.78 KB)
📄 LEB128.cpp(1.19 KB)
📄 LineIterator.cpp(2.61 KB)
📄 Locale.cpp(377 B)
📄 LockFileManager.cpp(10.64 KB)
📄 LowLevelType.cpp(2.09 KB)
📄 MD5.cpp(8.99 KB)
📄 ManagedStatic.cpp(2.37 KB)
📄 MathExtras.cpp(913 B)
📄 MemAlloc.cpp(1.01 KB)
📄 Memory.cpp(1.57 KB)
📄 MemoryBuffer.cpp(18.99 KB)
📄 NativeFormatting.cpp(7.54 KB)
📄 OptimizedStructLayout.cpp(16.7 KB)
📄 Optional.cpp(530 B)
📄 Parallel.cpp(5.08 KB)
📄 Path.cpp(36.52 KB)
📄 PluginLoader.cpp(1.63 KB)
📄 PrettyStackTrace.cpp(10.33 KB)
📄 Process.cpp(3.27 KB)
📄 Program.cpp(3.54 KB)
📄 RISCVAttributeParser.cpp(2.06 KB)
📄 RISCVAttributes.cpp(970 B)
📄 RWMutex.cpp(3.23 KB)
📄 RandomNumberGenerator.cpp(2.86 KB)
📄 Regex.cpp(6.38 KB)
📄 SHA1.cpp(10.43 KB)
📄 ScaledNumber.cpp(9.09 KB)
📄 ScopedPrinter.cpp(1.19 KB)
📄 Signals.cpp(8.35 KB)
📄 Signposts.cpp(3.24 KB)
📄 SmallPtrSet.cpp(9.21 KB)
📄 SmallVector.cpp(3.99 KB)
📄 SourceMgr.cpp(20.08 KB)
📄 SpecialCaseList.cpp(7.48 KB)
📄 Statistic.cpp(8.85 KB)
📄 StringExtras.cpp(4.34 KB)
📄 StringMap.cpp(9.31 KB)
📄 StringRef.cpp(17.41 KB)
📄 StringSaver.cpp(882 B)
📄 SuffixTree.cpp(7.23 KB)
📄 SymbolRemappingReader.cpp(2.94 KB)
📄 SystemUtils.cpp(1.06 KB)
📄 TarWriter.cpp(7.23 KB)
📄 TargetParser.cpp(9.86 KB)
📄 TargetRegistry.cpp(4.6 KB)
📄 ThreadLocal.cpp(1.68 KB)
📄 ThreadPool.cpp(4.4 KB)
📄 Threading.cpp(4.55 KB)
📄 TimeProfiler.cpp(11.63 KB)
📄 Timer.cpp(14.14 KB)
📄 ToolOutputFile.cpp(1.83 KB)
📄 TrigramIndex.cpp(3.24 KB)
📄 Triple.cpp(53.17 KB)
📄 Twine.cpp(4.6 KB)
📄 Unicode.cpp(20.14 KB)
📄 UnicodeCaseFold.cpp(15.32 KB)
📁 Unix
📄 Valgrind.cpp(1.6 KB)
📄 VersionTuple.cpp(2.74 KB)
📄 VirtualFileSystem.cpp(74.17 KB)
📄 Watchdog.cpp(738 B)
📁 Windows
📄 WithColor.cpp(4.35 KB)
📄 X86TargetParser.cpp(27.21 KB)
📄 YAMLParser.cpp(68.53 KB)
📄 YAMLTraits.cpp(28.37 KB)
📄 Z3Solver.cpp(31.44 KB)
📄 circular_raw_ostream.cpp(1.3 KB)
📄 raw_os_ostream.cpp(995 B)
📄 raw_ostream.cpp(28.97 KB)
📄 regcomp.c(39.42 KB)
📄 regengine.inc(26.49 KB)
📄 regerror.c(4.42 KB)
📄 regex2.h(6.82 KB)
📄 regex_impl.h(3.63 KB)
📄 regexec.c(5.71 KB)
📄 regfree.c(2.49 KB)
📄 regstrlcpy.c(1.56 KB)
📄 regutils.h(2.25 KB)
📄 xxhash.cpp(4.07 KB)

Editing: FileUtilities.cpp

//===- 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;

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Editing: FileUtilities.cpp

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