C++ Error::GetError方法代码示例

Error MachException::PortInfo::Save(task_t task) {
  Error error;
  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));

  if (log)
    log->Printf("MachException::PortInfo::%s(task = 0x%4.4x)", __FUNCTION__,
                task);

  // Be careful to be able to have debugserver built on a newer OS than what
  // it is currently running on by being able to start with all exceptions
  // and back off to just what is supported on the current system
  mask = LLDB_EXC_MASK;

  count = (sizeof(ports) / sizeof(ports[0]));
  auto mach_err = ::task_get_exception_ports(task, mask, masks, &count, ports,
                                             behaviors, flavors);
  if (mach_err)
    error.SetError(mach_err, eErrorTypeMachKernel);

  if (log) {
    if (error.Success()) {
      log->Printf("::task_get_exception_ports(task = 0x%4.4x, mask = "
                  "0x%x, maskCnt => %u, ports, behaviors, flavors)",
                  task, mask, count);
    } else {
      log->Printf("::task_get_exception_ports(task = 0x%4.4x, mask = 0x%x, "
                  "maskCnt => %u, ports, behaviors, flavors) error: %u (%s)",
                  task, mask, count, error.GetError(), error.AsCString());
    }
  }

  if ((error.GetError() == KERN_INVALID_ARGUMENT) &&
      (mask != PREV_EXC_MASK_ALL)) {
    mask = PREV_EXC_MASK_ALL;
    count = (sizeof(ports) / sizeof(ports[0]));
    mach_err = ::task_get_exception_ports(task, mask, masks, &count, ports,
                                          behaviors, flavors);
    error.SetError(mach_err, eErrorTypeMachKernel);
    if (log) {
      if (error.Success()) {
        log->Printf("::task_get_exception_ports(task = 0x%4.4x, "
                    "mask = 0x%x, maskCnt => %u, ports, behaviors, "
                    "flavors)",
                    task, mask, count);
      } else {
        log->Printf("::task_get_exception_ports(task = 0x%4.4x, mask = "
                    "0x%x, maskCnt => %u, ports, behaviors, flavors) "
                    "error: %u (%s)",
                    task, mask, count, error.GetError(), error.AsCString());
      }
    }
  }
  if (error.Fail()) {
    mask = 0;
    count = 0;
  }
  return error;
}

GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServer::Handle_vFile_unlink (StringExtractorGDBRemote &packet)
{
    packet.SetFilePos(::strlen("vFile:unlink:"));
    std::string path;
    packet.GetHexByteString(path);
    Error error = Host::Unlink(path.c_str());
    StreamString response;
    response.Printf("F%u,%u", error.GetError(), error.GetError());
    return SendPacketNoLock(response.GetData(), response.GetSize());
}

GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServerCommon::Handle_vFile_unlink(
    StringExtractorGDBRemote &packet) {
  packet.SetFilePos(::strlen("vFile:unlink:"));
  std::string path;
  packet.GetHexByteString(path);
  Error error = FileSystem::Unlink(FileSpec{path, true});
  StreamString response;
  response.Printf("F%u,%u", error.GetError(), error.GetError());
  return SendPacketNoLock(response.GetString());
}

size_t
ProcessWindows::DoWriteMemory(lldb::addr_t vm_addr, const void *buf, size_t size, Error &error)
{
    llvm::sys::ScopedLock lock(m_mutex);
    WINLOG_IFALL(WINDOWS_LOG_MEMORY, "DoWriteMemory attempting to write %u bytes into address 0x%I64x", size, vm_addr);

    if (!m_session_data)
    {
        WINERR_IFANY(WINDOWS_LOG_MEMORY, "DoWriteMemory cannot write, there is no active debugger connection.");
        return 0;
    }

    HostProcess process = m_session_data->m_debugger->GetProcess();
    void *addr = reinterpret_cast<void *>(vm_addr);
    SIZE_T bytes_written = 0;
    lldb::process_t handle = process.GetNativeProcess().GetSystemHandle();
    if (WriteProcessMemory(handle, addr, buf, size, &bytes_written))
        FlushInstructionCache(handle, addr, bytes_written);
    else
    {
        error.SetError(GetLastError(), eErrorTypeWin32);
        WINLOG_IFALL(WINDOWS_LOG_MEMORY, "DoWriteMemory failed with error code %u", error.GetError());
    }
    return bytes_written;
}

Error PipePosix::CreateWithUniqueName(llvm::StringRef prefix,
                                      bool child_process_inherit,
                                      llvm::SmallVectorImpl<char> &name) {
  llvm::SmallString<PATH_MAX> named_pipe_path;
  llvm::SmallString<PATH_MAX> pipe_spec((prefix + ".%%%%%%").str());
  FileSpec tmpdir_file_spec;
  tmpdir_file_spec.Clear();
  if (HostInfo::GetLLDBPath(ePathTypeLLDBTempSystemDir, tmpdir_file_spec)) {
    tmpdir_file_spec.AppendPathComponent(pipe_spec.c_str());
  } else {
    tmpdir_file_spec.AppendPathComponent("/tmp");
    tmpdir_file_spec.AppendPathComponent(pipe_spec.c_str());
  }

  // It's possible that another process creates the target path after we've
  // verified it's available but before we create it, in which case we
  // should try again.
  Error error;
  do {
    llvm::sys::fs::createUniqueFile(tmpdir_file_spec.GetPath(),
                                    named_pipe_path);
    error = CreateNew(named_pipe_path, child_process_inherit);
  } while (error.GetError() == EEXIST);

  if (error.Success())
    name = named_pipe_path;
  return error;
}

Error PlatformRemoteGDBServer::Unlink(const FileSpec &file_spec) {
  Error error = m_gdb_client.Unlink(file_spec);
  Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
  if (log)
    log->Printf("PlatformRemoteGDBServer::Unlink(path='%s') error = %u (%s)",
                file_spec.GetCString(), error.GetError(), error.AsCString());
  return error;
}

size_t
ConnectionFileDescriptor::Write(const void *src, size_t src_len, ConnectionStatus &status, Error *error_ptr)
{
    Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION));
    if (log)
        log->Printf("%p ConnectionFileDescriptor::Write (src = %p, src_len = %" PRIu64 ")", static_cast<void *>(this),
                    static_cast<const void *>(src), static_cast<uint64_t>(src_len));

    if (!IsConnected())
    {
        if (error_ptr)
            error_ptr->SetErrorString("not connected");
        status = eConnectionStatusNoConnection;
        return 0;
    }

    Error error;

    size_t bytes_sent = src_len;
    error = m_write_sp->Write(src, bytes_sent);

    if (log)
    {
        log->Printf("%p ConnectionFileDescriptor::Write(fd = %" PRIu64 ", src = %p, src_len = %" PRIu64 ") => %" PRIu64 " (error = %s)",
                    static_cast<void *>(this), static_cast<uint64_t>(m_write_sp->GetWaitableHandle()), static_cast<const void *>(src),
                    static_cast<uint64_t>(src_len), static_cast<uint64_t>(bytes_sent), error.AsCString());
    }

    if (error_ptr)
        *error_ptr = error;

    if (error.Fail())
    {
        switch (error.GetError())
        {
            case EAGAIN:
            case EINTR:
                status = eConnectionStatusSuccess;
                return 0;

            case ECONNRESET: // The connection is closed by the peer during a read attempt on a socket.
            case ENOTCONN:   // A read is attempted on an unconnected socket.
                status = eConnectionStatusLostConnection;
                break; // Break to close....

            default:
                status = eConnectionStatusError;
                break; // Break to close....
        }

        return 0;
    }

    status = eConnectionStatusSuccess;
    return bytes_sent;
}

Error
PlatformRemoteGDBServer::MakeDirectory(const FileSpec &file_spec, uint32_t mode)
{
    Error error = m_gdb_client.MakeDirectory(file_spec, mode);
    Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
    if (log)
        log->Printf ("PlatformRemoteGDBServer::MakeDirectory(path='%s', mode=%o) error = %u (%s)",
                file_spec.GetCString(), mode, error.GetError(), error.AsCString());
    return error;
}

Error
ProcessWindowsLive::GetMemoryRegionInfo(lldb::addr_t vm_addr, MemoryRegionInfo &info)
{
    Error error;
    llvm::sys::ScopedLock lock(m_mutex);

    if (!m_session_data)
    {
        error.SetErrorString("GetMemoryRegionInfo called with no debugging session.");
        WINERR_IFALL(WINDOWS_LOG_MEMORY, error.AsCString());
        return error;
    }

    HostProcess process = m_session_data->m_debugger->GetProcess();
    lldb::process_t handle = process.GetNativeProcess().GetSystemHandle();
    if (handle == nullptr || handle == LLDB_INVALID_PROCESS)
    {
        error.SetErrorString("GetMemoryRegionInfo called with an invalid target process.");
        WINERR_IFALL(WINDOWS_LOG_MEMORY, error.AsCString());
        return error;
    }

    WINLOG_IFALL(WINDOWS_LOG_MEMORY, "GetMemoryRegionInfo getting info for address 0x%I64x", vm_addr);

    void *addr = reinterpret_cast<void *>(vm_addr);
    MEMORY_BASIC_INFORMATION mem_info = {0};
    SIZE_T result = ::VirtualQueryEx(handle, addr, &mem_info, sizeof(mem_info));
    if (result == 0)
    {
        error.SetError(::GetLastError(), eErrorTypeWin32);
        WINERR_IFALL(WINDOWS_LOG_MEMORY,
                     "VirtualQueryEx returned error %u while getting memory region info for address 0x%I64x",
                     error.GetError(), vm_addr);
        return error;
    }
    const bool readable = IsPageReadable(mem_info.Protect);
    const bool executable = IsPageExecutable(mem_info.Protect);
    const bool writable = IsPageWritable(mem_info.Protect);
    info.SetReadable(readable ? MemoryRegionInfo::eYes : MemoryRegionInfo::eNo);
    info.SetExecutable(executable ? MemoryRegionInfo::eYes : MemoryRegionInfo::eNo);
    info.SetWritable(writable ? MemoryRegionInfo::eYes : MemoryRegionInfo::eNo);

    error.SetError(::GetLastError(), eErrorTypeWin32);
    WINLOGV_IFALL(WINDOWS_LOG_MEMORY, "Memory region info for address 0x%I64u: readable=%s, executable=%s, writable=%s",
                  BOOL_STR(readable), BOOL_STR(executable), BOOL_STR(writable));
    return error;
}

GDBRemoteCommunication::PacketResult
GDBRemoteCommunicationServerCommon::Handle_qPlatform_chmod (StringExtractorGDBRemote &packet)
{
    packet.SetFilePos(::strlen("qPlatform_chmod:"));

    mode_t mode = packet.GetHexMaxU32(false, UINT32_MAX);
    if (packet.GetChar() == ',')
    {
        std::string path;
        packet.GetHexByteString(path);
        Error error = FileSystem::SetFilePermissions(FileSpec{path, true}, mode);

        StreamGDBRemote response;
        response.Printf("F%u", error.GetError());

        return SendPacketNoLock(response.GetData(), response.GetSize());
    }
    return SendErrorResponse(19);
}

Error
ProcessWindows::DoHalt(bool &caused_stop)
{
    Error error;
    StateType state = GetPrivateState();
    if (state == eStateStopped)
        caused_stop = false;
    else
    {
        llvm::sys::ScopedLock lock(m_mutex);
        caused_stop = ::DebugBreakProcess(m_session_data->m_debugger->GetProcess().GetNativeProcess().GetSystemHandle());
        if (!caused_stop)
        {
            error.SetError(::GetLastError(), eErrorTypeWin32);
            WINERR_IFALL(WINDOWS_LOG_PROCESS, "DoHalt called DebugBreakProcess, but it failed with error %u",
                         error.GetError());
        }
    }
    return error;
}

Error MachException::PortInfo::Restore(task_t task) {
  Error error;

  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));

  if (log)
    log->Printf("MachException::PortInfo::Restore(task = 0x%4.4x)", task);

  uint32_t i = 0;
  if (count > 0) {
    for (i = 0; i < count; i++) {
      auto mach_err = ::task_set_exception_ports(task, masks[i], ports[i],
                                                 behaviors[i], flavors[i]);
      if (mach_err)
        error.SetError(mach_err, eErrorTypeMachKernel);
      if (log) {
        if (error.Success()) {
          log->Printf("::task_set_exception_ports(task = 0x%4.4x, "
                      "exception_mask = 0x%8.8x, new_port = 0x%4.4x, "
                      "behavior = 0x%8.8x, new_flavor = 0x%8.8x)",
                      task, masks[i], ports[i], behaviors[i], flavors[i]);
        } else {
          log->Printf("::task_set_exception_ports(task = 0x%4.4x, "
                      "exception_mask = 0x%8.8x, new_port = 0x%4.4x, "
                      "behavior = 0x%8.8x, new_flavor = 0x%8.8x): "
                      "error %u (%s)",
                      task, masks[i], ports[i], behaviors[i], flavors[i],
                      error.GetError(), error.AsCString());
        }
      }

      // Bail if we encounter any errors
      if (error.Fail())
        break;
    }
  }

  count = 0;
  return error;
}

void SendError( int priority, const char* module_name, const Error& error )
{
    SendErrorText( priority, module_name, error.GetError());
}

//----------------------------------------------------------------------
// The file descriptor FD is assumed to already be opened as read only
// and the STAT structure is assumed to a valid pointer and already
// containing valid data from a call to stat().
//
// Memory map FILE_LENGTH bytes in FILE starting FILE_OFFSET bytes into
// the file. If FILE_LENGTH is set to SIZE_MAX, then map as many bytes
// as possible.
//
// RETURNS
//  Number of bytes mapped starting from the requested offset.
//----------------------------------------------------------------------
size_t
DataBufferMemoryMap::MemoryMapFromFileDescriptor (int fd, 
                                                  off_t offset, 
                                                  size_t length,
                                                  bool writeable,
                                                  bool fd_is_file)
{
    Clear();
    if (fd >= 0)
    {
        struct stat stat;
        if (::fstat(fd, &stat) == 0)
        {
            if (S_ISREG(stat.st_mode) && (stat.st_size > offset))
            {
                const size_t max_bytes_available = stat.st_size - offset;
                if (length == SIZE_MAX)
                {
                    length = max_bytes_available;
                }
                else if (length > max_bytes_available)
                {
                    // Cap the length if too much data was requested
                    length = max_bytes_available;
                }

                if (length > 0)
                {
                    int prot = PROT_READ;
                    if (writeable)
                        prot |= PROT_WRITE;

                    int flags = MAP_PRIVATE;
                    if (fd_is_file)
                        flags |= MAP_FILE;

                    m_mmap_addr = (uint8_t *)::mmap(NULL, length, prot, flags, fd, offset);

                    if (m_mmap_addr == (void*)-1)
                    {
                        Error error;
                        error.SetErrorToErrno ();
                        if (error.GetError() == EINVAL)
                        {
                            // We may still have a shot at memory mapping if we align things correctly
                            size_t page_offset = offset % Host::GetPageSize();
                            if (page_offset != 0)
                            {
                                m_mmap_addr = (uint8_t *)::mmap(NULL, length + page_offset, prot, flags, fd, offset - page_offset);
                                if (m_mmap_addr == (void*)-1)
                                {
                                    // Failed to map file
                                    m_mmap_addr = NULL;
                                }
                                else if (m_mmap_addr != NULL)
                                {
                                    // We recovered and were able to memory map
                                    // after we aligned things to page boundaries

                                    // Save the actual mmap'ed size
                                    m_mmap_size = length + page_offset;
                                    // Our data is at an offset into the the mapped data
                                    m_data = m_mmap_addr + page_offset;
                                    // Our pretend size is the size that was requestd
                                    m_size = length;
                                }
                            }
                        }
                        if (error.GetError() == ENOMEM)
                        {
                           error.SetErrorStringWithFormat("could not allocate %lld bytes of memory to mmap in file", (uint64_t) length);
                        }
                    }
                    else
                    {
                        // We were able to map the requested data in one chunk
                        // where our mmap and actual data are the same.
                        m_mmap_size = length;
                        m_data = m_mmap_addr;
                        m_size = length;
                    }
                }
            }
        }
    }
    return GetByteSize ();
}

ConnectionStatus
ConnectionFileDescriptor::BytesAvailable (uint32_t timeout_usec, Error *error_ptr)
{
    // Don't need to take the mutex here separately since we are only called from Read.  If we
    // ever get used more generally we will need to lock here as well.
    
    LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_CONNECTION));
    if (log)
        log->Printf("%p ConnectionFileDescriptor::BytesAvailable (timeout_usec = %u)", this, timeout_usec);
    struct timeval *tv_ptr;
    struct timeval tv;
    if (timeout_usec == UINT32_MAX)
    {
        // Infinite wait...
        tv_ptr = NULL;
    }
    else
    {
        TimeValue time_value;
        time_value.OffsetWithMicroSeconds (timeout_usec);
        tv = time_value.GetAsTimeVal();
        tv_ptr = &tv;
    }

    while (m_fd_recv >= 0)
    {
        fd_set read_fds;
        FD_ZERO (&read_fds);
        FD_SET (m_fd_recv, &read_fds);
        if (m_pipe_read != -1)
            FD_SET (m_pipe_read, &read_fds);
        int nfds = std::max<int>(m_fd_recv, m_pipe_read) + 1;
        
        Error error;


        if (log)
            log->Printf("%p ConnectionFileDescriptor::BytesAvailable()  ::select (nfds = %i, fd = %i, NULL, NULL, timeout = %p)...",
                        this, nfds, m_fd_recv, tv_ptr);

        const int num_set_fds = ::select (nfds, &read_fds, NULL, NULL, tv_ptr);
        if (num_set_fds < 0)
            error.SetErrorToErrno();
        else
            error.Clear();

        if (log)
            log->Printf("%p ConnectionFileDescriptor::BytesAvailable()  ::select (nfds = %i, fd = %i, NULL, NULL, timeout = %p) => %d, error = %s",
                        this, nfds, m_fd_recv, tv_ptr, num_set_fds, error.AsCString());

        if (error_ptr)
            *error_ptr = error;

        if (error.Fail())
        {
            switch (error.GetError())
            {
            case EBADF:     // One of the descriptor sets specified an invalid descriptor.
                return eConnectionStatusLostConnection;

            case EINVAL:    // The specified time limit is invalid. One of its components is negative or too large.
            default:        // Other unknown error
                return eConnectionStatusError;

            case EAGAIN:    // The kernel was (perhaps temporarily) unable to
                            // allocate the requested number of file descriptors,
                            // or we have non-blocking IO
            case EINTR:     // A signal was delivered before the time limit
                            // expired and before any of the selected events
                            // occurred.
                break;      // Lets keep reading to until we timeout
            }
        }
        else if (num_set_fds == 0)
        {
            return eConnectionStatusTimedOut;
        }
        else if (num_set_fds > 0)
        {
            if (m_pipe_read != -1 && FD_ISSET(m_pipe_read, &read_fds))
            {
                // We got a command to exit.  Read the data from that pipe:
                char buffer[16];
                ssize_t bytes_read;
                
                do
                {
                    bytes_read = ::read (m_pipe_read, buffer, sizeof(buffer));
                } while (bytes_read < 0 && errno == EINTR);
                assert (bytes_read == 1 && buffer[0] == 'q');
                
                if (log)
                    log->Printf("%p ConnectionFileDescriptor::BytesAvailable() got data: %*s from the command channel.",
                                this, (int) bytes_read, buffer);

                return eConnectionStatusEndOfFile;
            }
            else
                return eConnectionStatusSuccess;
        }
//.........这里部分代码省略.........