C++ StringExtractorGDBRemote::Clear方法代码示例

size_t
GDBRemoteCommunication::WaitForPacketWithTimeoutMicroSecondsNoLock (StringExtractorGDBRemote &packet, uint32_t timeout_usec)
{
    uint8_t buffer[8192];
    Error error;

    Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PACKETS | GDBR_LOG_VERBOSE));

    // Check for a packet from our cache first without trying any reading...
    if (CheckForPacket (NULL, 0, packet))
        return packet.GetStringRef().size();

    bool timed_out = false;
    while (IsConnected() && !timed_out)
    {
        lldb::ConnectionStatus status = eConnectionStatusNoConnection;
        size_t bytes_read = Read (buffer, sizeof(buffer), timeout_usec, status, &error);
        
        if (log)
            log->Printf ("%s: Read (buffer, (sizeof(buffer), timeout_usec = 0x%x, status = %s, error = %s) => bytes_read = %" PRIu64,
                         __PRETTY_FUNCTION__,
                         timeout_usec, 
                         Communication::ConnectionStatusAsCString (status),
                         error.AsCString(), 
                         (uint64_t)bytes_read);

        if (bytes_read > 0)
        {
            if (CheckForPacket (buffer, bytes_read, packet))
                return packet.GetStringRef().size();
        }
        else
        {
            switch (status)
            {
            case eConnectionStatusTimedOut:
                timed_out = true;
                break;
            case eConnectionStatusSuccess:
                //printf ("status = success but error = %s\n", error.AsCString("<invalid>"));
                break;
                
            case eConnectionStatusEndOfFile:
            case eConnectionStatusNoConnection:
            case eConnectionStatusLostConnection:
            case eConnectionStatusError:
                Disconnect();
                break;
            }
        }
    }
    packet.Clear ();    
    return 0;
}

//.........这里部分代码省略.........
                    // We have an unexpected byte and we need to flush all bad 
                    // data that is in m_bytes, so we need to find the first
                    // byte that is a '+' (ACK), '-' (NACK), \x03 (CTRL+C interrupt),
                    // or '$' character (start of packet header) or of course,
                    // the end of the data in m_bytes...
                    const size_t bytes_len = m_bytes.size();
                    bool done = false;
                    uint32_t idx;
                    for (idx = 1; !done && idx < bytes_len; ++idx)
                    {
                        switch (m_bytes[idx])
                        {
                        case '+':
                        case '-':
                        case '\x03':
                        case '$':
                            done = true;
                            break;
                                
                        default:
                            break;
                        }
                    }
                    if (log)
                        log->Printf ("GDBRemoteCommunication::%s tossing %u junk bytes: '%.*s'",
                                     __FUNCTION__, idx, idx, m_bytes.c_str());
                    m_bytes.erase(0, idx);
                }
                break;
        }

        if (content_length == std::string::npos)
        {
            packet.Clear();
            return false;
        }
        else if (total_length > 0)
        {

            // We have a valid packet...
            assert (content_length <= m_bytes.size());
            assert (total_length <= m_bytes.size());
            assert (content_length <= total_length);
            
            bool success = true;
            std::string &packet_str = packet.GetStringRef();
            
            
            if (log)
            {
                // If logging was just enabled and we have history, then dump out what
                // we have to the log so we get the historical context. The Dump() call that
                // logs all of the packet will set a boolean so that we don't dump this more
                // than once
                if (!m_history.DidDumpToLog ())
                    m_history.Dump (log);
                
                log->Printf("<%4" PRIu64 "> read packet: %.*s", (uint64_t)total_length, (int)(total_length), m_bytes.c_str());
            }

            m_history.AddPacket (m_bytes.c_str(), total_length, History::ePacketTypeRecv, total_length);

            // Clear packet_str in case there is some existing data in it.
            packet_str.clear();
            // Copy the packet from m_bytes to packet_str expanding the
            // run-length encoding in the process.

StateType GDBRemoteClientBase::SendContinuePacketAndWaitForResponse(
    ContinueDelegate &delegate, const UnixSignals &signals,
    llvm::StringRef payload, StringExtractorGDBRemote &response) {
  Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS));
  response.Clear();

  {
    std::lock_guard<std::mutex> lock(m_mutex);
    m_continue_packet = payload;
    m_should_stop = false;
  }
  ContinueLock cont_lock(*this);
  if (!cont_lock)
    return eStateInvalid;
  OnRunPacketSent(true);

  for (;;) {
    PacketResult read_result = ReadPacket(response, kInterruptTimeout, false);
    switch (read_result) {
    case PacketResult::ErrorReplyTimeout: {
      std::lock_guard<std::mutex> lock(m_mutex);
      if (m_async_count == 0)
        continue;
      if (steady_clock::now() >= m_interrupt_time + kInterruptTimeout)
        return eStateInvalid;
    }
    case PacketResult::Success:
      break;
    default:
      if (log)
        log->Printf("GDBRemoteClientBase::%s () ReadPacket(...) => false",
                    __FUNCTION__);
      return eStateInvalid;
    }
    if (response.Empty())
      return eStateInvalid;

    const char stop_type = response.GetChar();
    if (log)
      log->Printf("GDBRemoteClientBase::%s () got packet: %s", __FUNCTION__,
                  response.GetStringRef().c_str());

    switch (stop_type) {
    case 'W':
    case 'X':
      return eStateExited;
    case 'E':
      // ERROR
      return eStateInvalid;
    default:
      if (log)
        log->Printf("GDBRemoteClientBase::%s () unrecognized async packet",
                    __FUNCTION__);
      return eStateInvalid;
    case 'O': {
      std::string inferior_stdout;
      response.GetHexByteString(inferior_stdout);
      delegate.HandleAsyncStdout(inferior_stdout);
      break;
    }
    case 'A':
      delegate.HandleAsyncMisc(
          llvm::StringRef(response.GetStringRef()).substr(1));
      break;
    case 'J':
      delegate.HandleAsyncStructuredDataPacket(response.GetStringRef());
      break;
    case 'T':
    case 'S':
      // Do this with the continue lock held.
      const bool should_stop = ShouldStop(signals, response);
      response.SetFilePos(0);

      // The packet we should resume with. In the future
      // we should check our thread list and "do the right thing"
      // for new threads that show up while we stop and run async
      // packets. Setting the packet to 'c' to continue all threads
      // is the right thing to do 99.99% of the time because if a
      // thread was single stepping, and we sent an interrupt, we
      // will notice above that we didn't stop due to an interrupt
      // but stopped due to stepping and we would _not_ continue.
      // This packet may get modified by the async actions (e.g. to send a
      // signal).
      m_continue_packet = 'c';
      cont_lock.unlock();

      delegate.HandleStopReply();
      if (should_stop)
        return eStateStopped;

      switch (cont_lock.lock()) {
      case ContinueLock::LockResult::Success:
        break;
      case ContinueLock::LockResult::Failed:
        return eStateInvalid;
      case ContinueLock::LockResult::Cancelled:
        return eStateStopped;
      }
      OnRunPacketSent(false);
      break;
//.........这里部分代码省略.........