C++ ProcessLaunchInfo::GetListenerForProcess方法代码示例

lldb::ProcessSP PlatformRemoteGDBServer::DebugProcess(
    ProcessLaunchInfo &launch_info, Debugger &debugger,
    Target *target, // Can be NULL, if NULL create a new target, else use
                    // existing one
    Error &error) {
  lldb::ProcessSP process_sp;
  if (IsRemote()) {
    if (IsConnected()) {
      lldb::pid_t debugserver_pid = LLDB_INVALID_PROCESS_ID;
      std::string connect_url;
      if (!LaunchGDBServer(debugserver_pid, connect_url)) {
        error.SetErrorStringWithFormat("unable to launch a GDB server on '%s'",
                                       GetHostname());
      } else {
        if (target == NULL) {
          TargetSP new_target_sp;

          error = debugger.GetTargetList().CreateTarget(
              debugger, NULL, NULL, false, NULL, new_target_sp);
          target = new_target_sp.get();
        } else
          error.Clear();

        if (target && error.Success()) {
          debugger.GetTargetList().SetSelectedTarget(target);

          // The darwin always currently uses the GDB remote debugger plug-in
          // so even when debugging locally we are debugging remotely!
          process_sp = target->CreateProcess(
              launch_info.GetListenerForProcess(debugger), "gdb-remote", NULL);

          if (process_sp) {
            error = process_sp->ConnectRemote(nullptr, connect_url.c_str());
            // Retry the connect remote one time...
            if (error.Fail())
              error = process_sp->ConnectRemote(nullptr, connect_url.c_str());
            if (error.Success())
              error = process_sp->Launch(launch_info);
            else if (debugserver_pid != LLDB_INVALID_PROCESS_ID) {
              printf("error: connect remote failed (%s)\n", error.AsCString());
              KillSpawnedProcess(debugserver_pid);
            }
          }
        }
      }
    } else {
      error.SetErrorString("not connected to remote gdb server");
    }
  }
  return process_sp;
}

ProcessSP PlatformWindows::DebugProcess(ProcessLaunchInfo &launch_info,
                                        Debugger &debugger, Target *target,
                                        Error &error) {
  // Windows has special considerations that must be followed when launching or
  // attaching to a process.  The
  // key requirement is that when launching or attaching to a process, you must
  // do it from the same the thread
  // that will go into a permanent loop which will then receive debug events
  // from the process.  In particular,
  // this means we can't use any of LLDB's generic mechanisms to do it for us,
  // because it doesn't have the
  // special knowledge required for setting up the background thread or passing
  // the right flags.
  //
  // Another problem is that that LLDB's standard model for debugging a process
  // is to first launch it, have
  // it stop at the entry point, and then attach to it.  In Windows this doesn't
  // quite work, you have to
  // specify as an argument to CreateProcess() that you're going to debug the
  // process.  So we override DebugProcess
  // here to handle this.  Launch operations go directly to the process plugin,
  // and attach operations almost go
  // directly to the process plugin (but we hijack the events first).  In
  // essence, we encapsulate all the logic
  // of Launching and Attaching in the process plugin, and
  // PlatformWindows::DebugProcess is just a pass-through
  // to get to the process plugin.

  if (launch_info.GetProcessID() != LLDB_INVALID_PROCESS_ID) {
    // This is a process attach.  Don't need to launch anything.
    ProcessAttachInfo attach_info(launch_info);
    return Attach(attach_info, debugger, target, error);
  } else {
    ProcessSP process_sp =
        target->CreateProcess(launch_info.GetListenerForProcess(debugger),
                              launch_info.GetProcessPluginName(), nullptr);

    // We need to launch and attach to the process.
    launch_info.GetFlags().Set(eLaunchFlagDebug);
    if (process_sp)
      error = process_sp->Launch(launch_info);

    return process_sp;
  }
}

// For local debugging, Linux will override the debug logic to use llgs-launch rather than
// lldb-launch, llgs-attach.  This differs from current lldb-launch, debugserver-attach
// approach on MacOSX.
lldb::ProcessSP
PlatformLinux::DebugProcess (ProcessLaunchInfo &launch_info,
                             Debugger &debugger,
                             Target *target,       // Can be NULL, if NULL create a new target, else use existing one
                             Error &error)
{
    Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PLATFORM));
    if (log)
        log->Printf ("PlatformLinux::%s entered (target %p)", __FUNCTION__, static_cast<void*>(target));

    // If we're a remote host, use standard behavior from parent class.
    if (!IsHost ())
        return PlatformPOSIX::DebugProcess (launch_info, debugger, target, error);

    //
    // For local debugging, we'll insist on having ProcessGDBRemote create the process.
    //

    ProcessSP process_sp;

    // Ensure we're using llgs for local debugging.
    if (!UseLlgsForLocalDebugging ())
    {
        assert (false && "we're trying to debug a local process but platform.plugin.linux.use-llgs-for-local is false, should never get here");
        error.SetErrorString ("attempted to start gdb-remote-based debugging for local process but platform.plugin.linux.use-llgs-for-local is false");
        return process_sp;
    }

    // Make sure we stop at the entry point
    launch_info.GetFlags ().Set (eLaunchFlagDebug);

    // We always launch the process we are going to debug in a separate process
    // group, since then we can handle ^C interrupts ourselves w/o having to worry
    // about the target getting them as well.
    launch_info.SetLaunchInSeparateProcessGroup(true);

    // Ensure we have a target.
    if (target == nullptr)
    {
        if (log)
            log->Printf ("PlatformLinux::%s creating new target", __FUNCTION__);

        TargetSP new_target_sp;
        error = debugger.GetTargetList().CreateTarget (debugger,
                                                       nullptr,
                                                       nullptr,
                                                       false,
                                                       nullptr,
                                                       new_target_sp);
        if (error.Fail ())
        {
            if (log)
                log->Printf ("PlatformLinux::%s failed to create new target: %s", __FUNCTION__, error.AsCString ());
            return process_sp;
        }

        target = new_target_sp.get();
        if (!target)
        {
            error.SetErrorString ("CreateTarget() returned nullptr");
            if (log)
                log->Printf ("PlatformLinux::%s failed: %s", __FUNCTION__, error.AsCString ());
            return process_sp;
        }
    }
    else
    {
        if (log)
            log->Printf ("PlatformLinux::%s using provided target", __FUNCTION__);
    }

    // Mark target as currently selected target.
    debugger.GetTargetList().SetSelectedTarget(target);

    // Now create the gdb-remote process.
    if (log)
        log->Printf ("PlatformLinux::%s having target create process with gdb-remote plugin", __FUNCTION__);
    process_sp = target->CreateProcess (launch_info.GetListenerForProcess(debugger), "gdb-remote", nullptr);

    if (!process_sp)
    {
        error.SetErrorString ("CreateProcess() failed for gdb-remote process");
        if (log)
            log->Printf ("PlatformLinux::%s failed: %s", __FUNCTION__, error.AsCString ());
        return process_sp;
    }
    else
    {
        if (log)
            log->Printf ("PlatformLinux::%s successfully created process", __FUNCTION__);
    }

    // Set the unix signals properly.
    process_sp->SetUnixSignals (Host::GetUnixSignals ());

    // Adjust launch for a hijacker.
    ListenerSP listener_sp;
//.........这里部分代码省略.........