C++ MemoryBuffer::getBufferEnd方法代码示例

bool CodeGenCoverage::parse(MemoryBuffer &Buffer, StringRef BackendName) {
  const char *CurPtr = Buffer.getBufferStart();

  while (CurPtr != Buffer.getBufferEnd()) {
    // Read the backend name from the input.
    const char *LexedBackendName = CurPtr;
    while (*CurPtr++ != 0)
      ;
    if (CurPtr == Buffer.getBufferEnd())
      return false; // Data is invalid, expected rule id's to follow.

    bool IsForThisBackend = BackendName.equals(LexedBackendName);
    while (CurPtr != Buffer.getBufferEnd()) {
      if (std::distance(CurPtr, Buffer.getBufferEnd()) < 8)
        return false; // Data is invalid. Not enough bytes for another rule id.

      uint64_t RuleID = support::endian::read64(CurPtr, support::native);
      CurPtr += 8;

      // ~0ull terminates the rule id list.
      if (RuleID == ~0ull)
        break;

      // Anything else, is recorded or ignored depending on whether it's
      // intended for the backend we're interested in.
      if (IsForThisBackend)
        setCovered(RuleID);
    }
  }

  return true;
}

/// Detect the likely line ending style of \p FromFile by examining the first
/// newline found within it.
static StringRef DetectEOL(const MemoryBuffer &FromFile) {
  // detect what line endings the file uses, so that added content does not mix
  // the style
  const char *Pos = strchr(FromFile.getBufferStart(), '\n');
  if (Pos == NULL)
    return "\n";
  if (Pos + 1 < FromFile.getBufferEnd() && Pos[1] == '\r')
    return "\n\r";
  if (Pos - 1 >= FromFile.getBufferStart() && Pos[-1] == '\r')
    return "\r\n";
  return "\n";
}

line_iterator::line_iterator(const MemoryBuffer &Buffer, char CommentMarker)
    : Buffer(Buffer.getBufferSize() ? &Buffer : nullptr),
      CommentMarker(CommentMarker), LineNumber(1),
      CurrentLine(Buffer.getBufferSize() ? Buffer.getBufferStart() : nullptr,
                  0) {
    // Ensure that if we are constructed on a non-empty memory buffer that it is
    // a null terminated buffer.
    if (Buffer.getBufferSize()) {
        assert(Buffer.getBufferEnd()[0] == '\0');
        advance();
    }
}

/// Detect the likely line ending style of \p FromFile by examining the first
/// newline found within it.
static StringRef DetectEOL(const MemoryBuffer &FromFile) {
  // Detect what line endings the file uses, so that added content does not mix
  // the style. We need to check for "\r\n" first because "\n\r" will match
  // "\r\n\r\n".
  const char *Pos = strchr(FromFile.getBufferStart(), '\n');
  if (!Pos)
    return "\n";
  if (Pos - 1 >= FromFile.getBufferStart() && Pos[-1] == '\r')
    return "\r\n";
  if (Pos + 1 < FromFile.getBufferEnd() && Pos[1] == '\r')
    return "\n\r";
  return "\n";
}

/// GetMessage - Return an SMDiagnostic at the specified location with the
/// specified string.
///
/// @param Type - If non-null, the kind of message (e.g., "error") which is
/// prefixed to the message.
SMDiagnostic SourceMgr::GetMessage(SMLoc Loc, SourceMgr::DiagKind Kind,
                                   const Twine &Msg,
                                   ArrayRef<SMRange> Ranges) const {

  // First thing to do: find the current buffer containing the specified
  // location.
  int CurBuf = FindBufferContainingLoc(Loc);
  assert(CurBuf != -1 && "Invalid or unspecified location!");

  MemoryBuffer *CurMB = getBufferInfo(CurBuf).Buffer;

  // Scan backward to find the start of the line.
  const char *LineStart = Loc.getPointer();
  while (LineStart != CurMB->getBufferStart() &&
         LineStart[-1] != '\n' && LineStart[-1] != '\r')
    --LineStart;

  // Get the end of the line.
  const char *LineEnd = Loc.getPointer();
  while (LineEnd != CurMB->getBufferEnd() &&
         LineEnd[0] != '\n' && LineEnd[0] != '\r')
    ++LineEnd;
  std::string LineStr(LineStart, LineEnd);

  // Convert any ranges to column ranges that only intersect the line of the
  // location.
  SmallVector<std::pair<unsigned, unsigned>, 4> ColRanges;
  for (unsigned i = 0, e = Ranges.size(); i != e; ++i) {
    SMRange R = Ranges[i];
    if (!R.isValid()) continue;
    
    // If the line doesn't contain any part of the range, then ignore it.
    if (R.Start.getPointer() > LineEnd || R.End.getPointer() < LineStart)
      continue;
   
    // Ignore pieces of the range that go onto other lines.
    if (R.Start.getPointer() < LineStart)
      R.Start = SMLoc::getFromPointer(LineStart);
    if (R.End.getPointer() > LineEnd)
      R.End = SMLoc::getFromPointer(LineEnd);
    
    // Translate from SMLoc ranges to column ranges.
    ColRanges.push_back(std::make_pair(R.Start.getPointer()-LineStart,
                                       R.End.getPointer()-LineStart));
  }
  
  return SMDiagnostic(*this, Loc,
                      CurMB->getBufferIdentifier(), FindLineNumber(Loc, CurBuf),
                      Loc.getPointer()-LineStart, Kind, Msg.str(),
                      LineStr, ColRanges);
}

line_iterator::line_iterator(const MemoryBuffer &Buffer, bool SkipBlanks,
                             char CommentMarker)
    : Buffer(Buffer.getBufferSize() ? &Buffer : nullptr),
      CommentMarker(CommentMarker), SkipBlanks(SkipBlanks), LineNumber(1),
      CurrentLine(Buffer.getBufferSize() ? Buffer.getBufferStart() : nullptr,
                  0) {
  // Ensure that if we are constructed on a non-empty memory buffer that it is
  // a null terminated buffer.
  if (Buffer.getBufferSize()) {
    assert(Buffer.getBufferEnd()[0] == '\0');
    // Make sure we don't skip a leading newline if we're keeping blanks
    if (SkipBlanks || !isAtLineEnd(Buffer.getBufferStart()))
      advance();
  }
}

/// GetMessage - Return an SMDiagnostic at the specified location with the
/// specified string.
///
/// @param Type - If non-null, the kind of message (e.g., "error") which is
/// prefixed to the message.
SMDiagnostic SourceMgr::GetMessage(SMLoc Loc, const Twine &Msg,
                                   const char *Type, bool ShowLine) const {

  // First thing to do: find the current buffer containing the specified
  // location.
  int CurBuf = FindBufferContainingLoc(Loc);
  assert(CurBuf != -1 && "Invalid or unspecified location!");

  MemoryBuffer *CurMB = getBufferInfo(CurBuf).Buffer;

  // Scan backward to find the start of the line.
  const char *LineStart = Loc.getPointer();
  while (LineStart != CurMB->getBufferStart() &&
         LineStart[-1] != '\n' && LineStart[-1] != '\r')
    --LineStart;

  std::string LineStr;
  if (ShowLine) {
    // Get the end of the line.
    const char *LineEnd = Loc.getPointer();
    while (LineEnd != CurMB->getBufferEnd() &&
           LineEnd[0] != '\n' && LineEnd[0] != '\r')
      ++LineEnd;
    LineStr = std::string(LineStart, LineEnd);
  }

  std::string PrintedMsg;
  raw_string_ostream OS(PrintedMsg);
  if (Type)
    OS << Type << ": ";
  OS << Msg;

  return SMDiagnostic(*this, Loc,
                      CurMB->getBufferIdentifier(), FindLineNumber(Loc, CurBuf),
                      Loc.getPointer()-LineStart, OS.str(),
                      LineStr, ShowLine);
}

		ErrorOr<unique_ptr<Executable>> parseExecutable(MemoryBuffer& executableCode)
		{
			auto start = reinterpret_cast<const uint8_t*>(executableCode.getBufferStart());
			auto end = reinterpret_cast<const uint8_t*>(executableCode.getBufferEnd());
			return Executable::parse(start, end);
		}