private static TraceThread GetOrCreateThread() {
TraceThread thread = _threads;
if (thread == null) {
_threads = thread = new TraceThread();
thread.Frames = new List<TraceBackFrame>();
}
return thread;
}
private void DispatchTrace(TraceThread thread, Debugging.TraceEventKind kind, object payload, TracebackDelegate traceDispatch, object traceDispatchObject, TraceBackFrame pyFrame) {
object args = null;
// Prepare the event
string traceEvent = String.Empty;
switch (kind) {
case Debugging.TraceEventKind.FrameEnter: traceEvent = "call"; break;
case Debugging.TraceEventKind.TracePoint: traceEvent = "line"; break;
case Debugging.TraceEventKind.Exception:
traceEvent = "exception";
object pyException = PythonExceptions.ToPython((Exception)payload);
object pyType = ((IPythonObject)pyException).PythonType;
args = PythonTuple.MakeTuple(pyType, pyException, null);
break;
case Debugging.TraceEventKind.FrameExit:
traceEvent = "return";
args = payload;
break;
}
bool traceDispatchThrew = true;
PythonContext.TracePipeline.TraceCallback = null;
thread.InTraceback = true;
try {
TracebackDelegate dlg = traceDispatch(pyFrame, traceEvent, args);
traceDispatchThrew = false;
pyFrame.Setf_trace(dlg);
} finally {
thread.InTraceback = false;
PythonContext.TracePipeline.TraceCallback = this;
if (traceDispatchThrew) {
// We're matching CPython's behavior here. If the trace dispatch throws any exceptions
// we don't re-enable tracebacks. We need to leave the trace callback in place though
// so that we can pop our frames.
_globalTraceObject = _globalTraceDispatch = null;
_exceptionThrown = true;
}
}
}