[lldb] Fix qEcho message handling (#145072)

Patch fixes the sync-on-timeout logic in lldb and switches to qEcho
based ping, instead of qC. This fixes vRun message case, when there is
no process yet and qC returns an error.

1 files changed, 10 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/gdbclientutils.py b/lldb/packages/Python/lldbsuite/test/gdbclientutils.py
index 753de22..b603c35 100644
--- a/lldb/packages/Python/lldbsuite/test/gdbclientutils.py
+++ b/lldb/packages/Python/lldbsuite/test/gdbclientutils.py
@@ -92,6 +92,9 @@ class MockGDBServerResponder:
     class RESPONSE_DISCONNECT:
         pass
 
+    class RESPONSE_NONE:
+        pass
+
     def __init__(self):
         self.packetLog = []
 
@@ -181,6 +184,8 @@ class MockGDBServerResponder:
             return self.qQueryGDBServer()
         if packet == "qHostInfo":
             return self.qHostInfo()
+        if packet.startswith("qEcho"):
+            return self.qEcho(int(packet.split(":")[1]))
         if packet == "qGetWorkingDir":
             return self.qGetWorkingDir()
         if packet == "qOffsets":
@@ -237,6 +242,9 @@ class MockGDBServerResponder:
     def qHostInfo(self):
         return "ptrsize:8;endian:little;"
 
+    def qEcho(self):
+        return "E04"
+
     def qQueryGDBServer(self):
         return "E04"
 
@@ -655,6 +663,8 @@ class MockGDBServer:
         if not isinstance(response, list):
             response = [response]
         for part in response:
+            if part is MockGDBServerResponder.RESPONSE_NONE:
+                continue
             if part is MockGDBServerResponder.RESPONSE_DISCONNECT:
                 raise self.TerminateConnectionException()
             self._sendPacket(part)