llgs: implement qThreadStopInfo.

This change implements this ticket:
http://llvm.org/bugs/show_bug.cgi?id=20899

Adds the qThreadStopInfo RSP command for llgs and includes a test that
verifies both debugserver and llgs respond with something reasonable
on a multithreaded app.

llvm-svn: 217549

1 files changed, 24 insertions, 2 deletions

diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.cpp
index 99e0fc634df..bb3b32d3c10 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.cpp
@@ -429,6 +429,10 @@ GDBRemoteCommunicationServer::GetPacketAndSendResponse (uint32_t timeout_usec,
         case StringExtractorGDBRemote::eServerPacketType_vAttach:
             packet_result = Handle_vAttach (packet);
             break;
+
+        case StringExtractorGDBRemote::eServerPacketType_qThreadStopInfo:
+            packet_result = Handle_qThreadStopInfo (packet);
+            break;
         }
     }
     else
@@ -2378,8 +2382,6 @@ GDBRemoteCommunicationServer::Handle_vCont_actions (StringExtractorGDBRemote &pa
         return SendUnimplementedResponse (packet.GetStringRef().c_str());
     }
 
-    // We handle $vCont messages for c.
-    // TODO add C, s and S.
     StreamString response;
     response.Printf("vCont;c;C;s;S");
 
@@ -4181,6 +4183,26 @@ GDBRemoteCommunicationServer::Handle_vAttach (StringExtractorGDBRemote &packet)
     return PacketResult::Success;
 }
 
+GDBRemoteCommunicationServer::PacketResult
+GDBRemoteCommunicationServer::Handle_qThreadStopInfo (StringExtractorGDBRemote &packet)
+{
+    Log *log (GetLogIfAnyCategoriesSet(LIBLLDB_LOG_THREAD));
+
+    // We don't support if we're not llgs.
+    if (!IsGdbServer())
+        return SendUnimplementedResponse ("only supported for lldb-gdbserver");
+
+    packet.SetFilePos (strlen("qThreadStopInfo"));
+    const lldb::tid_t tid = packet.GetHexMaxU32 (false, LLDB_INVALID_THREAD_ID);
+    if (tid == LLDB_INVALID_THREAD_ID)
+    {
+        if (log)
+            log->Printf ("GDBRemoteCommunicationServer::%s failed, could not parse thread id from request \"%s\"", __FUNCTION__, packet.GetStringRef ().c_str ());
+        return SendErrorResponse (0x15);
+    }
+    return SendStopReplyPacketForThread (tid);
+}
+
 void
 GDBRemoteCommunicationServer::FlushInferiorOutput ()
 {