Revert "[lldb] [llgs] Support multiprocess in qfThreadInfo"

This reverts part of commit 75757c86c695a6b4695458343637b3c4fe86def6.
It broke the following test:

  commands/target/auto-install-main-executable/TestAutoInstallMainExecutable.py

I need more time to figure it out, so I'm reverting the code changes
and marking the tests depending on them xfail.

1 files changed, 24 insertions, 29 deletions

diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
index 9356b01..770edbf 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
@@ -1976,43 +1976,38 @@ GDBRemoteCommunicationServerLLGS::Handle_qRegisterInfo(
   return SendPacketNoLock(response.GetString());
 }
 
-void GDBRemoteCommunicationServerLLGS::AddProcessThreads(
-    StreamGDBRemote &response, NativeProcessProtocol &process, bool &had_any) {
+GDBRemoteCommunication::PacketResult
+GDBRemoteCommunicationServerLLGS::Handle_qfThreadInfo(
+    StringExtractorGDBRemote &packet) {
   Log *log = GetLog(LLDBLog::Thread);
 
-  lldb::pid_t pid = process.GetID();
-  if (pid == LLDB_INVALID_PROCESS_ID)
-    return;
+  // Fail if we don't have a current process.
+  if (!m_current_process ||
+      (m_current_process->GetID() == LLDB_INVALID_PROCESS_ID)) {
+    LLDB_LOG(log, "no process ({0}), returning OK",
+             m_current_process ? "invalid process id"
+                               : "null m_current_process");
+    return SendOKResponse();
+  }
 
-  LLDB_LOG(log, "iterating over threads of process {0}", process.GetID());
+  StreamGDBRemote response;
+  response.PutChar('m');
+
+  LLDB_LOG(log, "starting thread iteration");
   NativeThreadProtocol *thread;
   uint32_t thread_index;
-  for (thread_index = 0, thread = process.GetThreadAtIndex(thread_index);
-       thread;
-       ++thread_index, thread = process.GetThreadAtIndex(thread_index)) {
-    LLDB_LOG(log, "iterated thread {0} (tid={1})", thread_index,
+  for (thread_index = 0,
+      thread = m_current_process->GetThreadAtIndex(thread_index);
+       thread; ++thread_index,
+      thread = m_current_process->GetThreadAtIndex(thread_index)) {
+    LLDB_LOG(log, "iterated thread {0}(tid={2})", thread_index,
              thread->GetID());
-    response.PutChar(had_any ? ',' : 'm');
-    AppendThreadIDToResponse(response, pid, thread->GetID());
-    had_any = true;
+    if (thread_index > 0)
+      response.PutChar(',');
+    response.Printf("%" PRIx64, thread->GetID());
   }
-}
 
-GDBRemoteCommunication::PacketResult
-GDBRemoteCommunicationServerLLGS::Handle_qfThreadInfo(
-    StringExtractorGDBRemote &packet) {
-  assert(m_debugged_processes.size() == 1 ||
-         bool(m_extensions_supported &
-              NativeProcessProtocol::Extension::multiprocess));
-
-  bool had_any = false;
-  StreamGDBRemote response;
-
-  for (auto &pid_ptr : m_debugged_processes)
-    AddProcessThreads(response, *pid_ptr.second, had_any);
-
-  if (!had_any)
-    response.PutChar('l');
+  LLDB_LOG(log, "finished thread iteration");
   return SendPacketNoLock(response.GetString());
 }