From 0b69756110db444282c40ea16929186b2910c3b1 Mon Sep 17 00:00:00 2001 From: Walter Erquinigo Date: Mon, 9 Nov 2020 13:36:26 -0800 Subject: [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 --- lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp') diff --git a/lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp b/lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp index 5aec98bdeca6..fcc96e274d22 100644 --- a/lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp +++ b/lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp @@ -77,6 +77,9 @@ void LogThreadStopInfo(Log &log, const ThreadStopInfo &stop_info, case eStopReasonInstrumentation: log.Printf("%s: %s instrumentation", __FUNCTION__, header); return; + case eStopReasonProcessorTrace: + log.Printf("%s: %s processor trace", __FUNCTION__, header); + return; default: log.Printf("%s: %s invalid stop reason %" PRIu32, __FUNCTION__, header, static_cast(stop_info.reason)); @@ -398,6 +401,15 @@ void NativeThreadLinux::SetStoppedWithNoReason() { m_stop_info.details.signal.signo = 0; } +void NativeThreadLinux::SetStoppedByProcessorTrace( + llvm::StringRef description) { + SetStopped(); + + m_stop_info.reason = StopReason::eStopReasonProcessorTrace; + m_stop_info.details.signal.signo = 0; + m_stop_description = description.str(); +} + void NativeThreadLinux::SetExited() { const StateType new_state = StateType::eStateExited; MaybeLogStateChange(new_state); -- cgit v1.2.3