[lldb] [llgs] Fix assertion in Handle_qfThreadInfo

[ayushsahay1837]

Currently, GDBRemoteCommunicationServerLLGS::Handle_qfThreadInfo asserts if the number of processes under debug isn’t 1 and the multiprocess feature isn’t supported. This is so that we don't string IDs of threads belonging to different processes together without including the IDs of the processes themselves in the response when there are multiple processes under debug. However, it’s conceivable that we have no process under debug and the multiprocess feature isn’t supported. So, have GDBRemoteCommunicationServerLLGS::Handle_qfThreadInfo assert if the number of processes under debug is greater than 1 and the multiprocess feature isn’t supported.

[llvmbot]

@llvm/pr-subscribers-lldb

Author: Ayush Sahay (ayushsahay1837)

Changes

Currently, GDBRemoteCommunicationServerLLGS::Handle_qfThreadInfo asserts if the number of processes under debug isn’t 1 and the multiprocess feature isn’t supported. This is so that we don't string IDs of threads belonging to different processes together without including the IDs of the processes themselves in the response when there are multiple processes under debug. However, it’s conceivable that we have no process under debug and the multiprocess feature isn’t supported. So, have GDBRemoteCommunicationServerLLGS::Handle_qfThreadInfo assert if the number of processes under debug is greater than 1 and the multiprocess feature isn’t supported.

---

Full diff: https://github.com/llvm/llvm-project/pull/88301.diff

1 Files Affected:

• (modified) lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp (+1-1)

diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
index 3d37bb226a65fd..ae1a77e5be8321 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
@@ -2087,7 +2087,7 @@ void GDBRemoteCommunicationServerLLGS::AddProcessThreads(
 GDBRemoteCommunication::PacketResult
 GDBRemoteCommunicationServerLLGS::Handle_qfThreadInfo(
     StringExtractorGDBRemote &packet) {
-  assert(m_debugged_processes.size() == 1 ||
+  assert(m_debugged_processes.size() <= 1 ||
          bool(m_extensions_supported &
               NativeProcessProtocol::Extension::multiprocess));
 

[tedwoodward]

LGTM