[trace][intel-pt] Implement trace start and trace stop

This implements the interactive trace start and stop methods.

This diff ended up being much larger than I anticipated because, by doing it, I found that I had implemented in the beginning many things in a non optimal way. In any case, the code is much better now.

There's a lot of boilerplate code due to the gdb-remote protocol, but the main changes are:

- New tracing packets: jLLDBTraceStop, jLLDBTraceStart, jLLDBTraceGetBinaryData. The gdb-remote packet definitions are quite comprehensive.
- Implementation of the "process trace start|stop" and "thread trace start|stop" commands.
- Implementaiton of an API in Trace.h to interact with live traces.
- Created an IntelPTDecoder for live threads, that use the debugger's stop id as checkpoint for its internal cache.
- Added a functionality to stop the process in case "process tracing" is enabled and a new thread can't traced.
- Added tests

I have some ideas to unify the code paths for post mortem and live threads, but I'll do that in another diff.

Differential Revision: https://reviews.llvm.org/D91679

1 files changed, 5 insertions, 5 deletions

diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
index a359326..ef7d447 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
@@ -167,15 +167,15 @@ protected:
 
   PacketResult Handle_QSaveRegisterState(StringExtractorGDBRemote &packet);
 
-  PacketResult Handle_jTraceStart(StringExtractorGDBRemote &packet);
+  PacketResult Handle_jLLDBTraceSupported(StringExtractorGDBRemote &packet);
 
-  PacketResult Handle_jTraceRead(StringExtractorGDBRemote &packet);
+  PacketResult Handle_jLLDBTraceStart(StringExtractorGDBRemote &packet);
 
-  PacketResult Handle_jTraceStop(StringExtractorGDBRemote &packet);
+  PacketResult Handle_jLLDBTraceStop(StringExtractorGDBRemote &packet);
 
-  PacketResult Handle_jTraceConfigRead(StringExtractorGDBRemote &packet);
+  PacketResult Handle_jLLDBTraceGetState(StringExtractorGDBRemote &packet);
 
-  PacketResult Handle_jLLDBTraceSupportedType(StringExtractorGDBRemote &packet);
+  PacketResult Handle_jLLDBTraceGetBinaryData(StringExtractorGDBRemote &packet);
 
   PacketResult Handle_QRestoreRegisterState(StringExtractorGDBRemote &packet);