[lldb] [llgs] Support "t" vCont action

Implement support for the "t" action that is used to stop a thread.
Normally this action is used only in non-stop mode.  However, there's
no technical reason why it couldn't be also used in all-stop mode,
e.g. to express "resume all threads except ..." (`t:...;c`).

While at it, add a more complete test for vCont correctly resuming
a subset of program's threads.

Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.llvm.org/D126983

1 files changed, 6 insertions, 1 deletions

diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
index 2c009ef..ae8b8ef 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
@@ -1654,7 +1654,7 @@ GDBRemoteCommunication::PacketResult
 GDBRemoteCommunicationServerLLGS::Handle_vCont_actions(
     StringExtractorGDBRemote &packet) {
   StreamString response;
-  response.Printf("vCont;c;C;s;S");
+  response.Printf("vCont;c;C;s;S;t");
 
   return SendPacketNoLock(response.GetString());
 }
@@ -1723,6 +1723,11 @@ GDBRemoteCommunicationServerLLGS::Handle_vCont(
       thread_action.state = eStateStepping;
       break;
 
+    case 't':
+      // Stop
+      thread_action.state = eStateSuspended;
+      break;
+
     default:
       return SendIllFormedResponse(packet, "Unsupported vCont action");
       break;