private TraceEventNativeMethods.EVENT_RECORD *ReadEvent(PinnedStreamReader reader)
{
// Guess that the event is < 1000 bytes or whatever is left in the stream.
int eventSizeGuess = Math.Min(1000, _endOfEventStream.Sub(reader.Current));
EventPipeEventHeader *eventData = (EventPipeEventHeader *)reader.GetPointer(eventSizeGuess);
// Basic sanity checks. Are the timestamps and sizes sane.
Debug.Assert(sessionEndTimeQPC <= eventData->TimeStamp);
Debug.Assert(sessionEndTimeQPC == 0 || eventData->TimeStamp - sessionEndTimeQPC < _QPCFreq * 24 * 3600);
Debug.Assert(0 <= eventData->PayloadSize && eventData->PayloadSize <= eventData->TotalEventSize);
Debug.Assert(eventData->MetaDataId <= reader.Current); // IDs are the location in the of of the data, so it comes before
Debug.Assert(0 < eventData->TotalEventSize && eventData->TotalEventSize < 0x20000); // TODO really should be 64K but BulkSurvivingObjectRanges needs fixing.
if (eventSizeGuess < eventData->TotalEventSize)
{
eventData = (EventPipeEventHeader *)reader.GetPointer(eventData->TotalEventSize);
}
Debug.Assert(0 <= EventPipeEventHeader.StackBytesSize(eventData) && EventPipeEventHeader.StackBytesSize(eventData) <= eventData->TotalEventSize);
// This asserts that the header size + payload + stackSize field + StackSize == TotalEventSize;
Debug.Assert(eventData->PayloadSize + EventPipeEventHeader.HeaderSize + sizeof(int) + EventPipeEventHeader.StackBytesSize(eventData) == eventData->TotalEventSize);
TraceEventNativeMethods.EVENT_RECORD *ret = null;
EventPipeEventMetaData metaData;
if (eventData->MetaDataId == 0) // Is this a Meta-data event?
{
int totalEventSize = eventData->TotalEventSize;
int payloadSize = eventData->PayloadSize;
StreamLabel metaDataStreamOffset = reader.Current; // Used as the 'id' for the meta-data
// Note that this skip invalidates the eventData pointer, so it is important to pull any fields out we need first.
reader.Skip(EventPipeEventHeader.HeaderSize);
metaData = new EventPipeEventMetaData(reader, payloadSize, _fileFormatVersionNumber, PointerSize, _processId);
_eventMetadataDictionary.Add(metaDataStreamOffset, metaData);
_eventParser.AddTemplate(metaData);
int stackBytes = reader.ReadInt32(); // Meta-data events should always have a empty stack.
Debug.Assert(stackBytes == 0);
// We have read all the bytes in the event
Debug.Assert(reader.Current == metaDataStreamOffset.Add(totalEventSize));
}
else
{
if (_eventMetadataDictionary.TryGetValue(eventData->MetaDataId, out metaData))
{
ret = metaData.GetEventRecordForEventData(eventData);
}
else
{
Debug.Assert(false, "Warning can't find metaData for ID " + eventData->MetaDataId.ToString("x"));
}
reader.Skip(eventData->TotalEventSize);
}
return(ret);
}
internal TraceEventNativeMethods.EVENT_RECORD *ReadEvent(PinnedStreamReader reader)
{
EventPipeEventHeader *eventData = (EventPipeEventHeader *)reader.GetPointer(EventPipeEventHeader.HeaderSize);
eventData = (EventPipeEventHeader *)reader.GetPointer(eventData->TotalEventSize); // now we now the real size and get read entire event
// Basic sanity checks. Are the timestamps and sizes sane.
Debug.Assert(sessionEndTimeQPC <= eventData->TimeStamp);
Debug.Assert(sessionEndTimeQPC == 0 || eventData->TimeStamp - sessionEndTimeQPC < _QPCFreq * 24 * 3600);
Debug.Assert(0 <= eventData->PayloadSize && eventData->PayloadSize <= eventData->TotalEventSize);
Debug.Assert(0 < eventData->TotalEventSize && eventData->TotalEventSize < 0x20000); // TODO really should be 64K but BulkSurvivingObjectRanges needs fixing.
Debug.Assert(_fileFormatVersionNumber < 3 ||
((int)EventPipeEventHeader.PayloadBytes(eventData) % 4 == 0 && eventData->TotalEventSize % 4 == 0)); // ensure 4 byte alignment
StreamLabel eventDataEnd = reader.Current.Add(eventData->TotalEventSize);
Debug.Assert(0 <= EventPipeEventHeader.StackBytesSize(eventData) && EventPipeEventHeader.StackBytesSize(eventData) <= eventData->TotalEventSize);
TraceEventNativeMethods.EVENT_RECORD *ret = null;;
if (eventData->IsMetadata())
{
int totalEventSize = eventData->TotalEventSize;
int payloadSize = eventData->PayloadSize;
// Note that this skip invalidates the eventData pointer, so it is important to pull any fields out we need first.
reader.Skip(EventPipeEventHeader.HeaderSize);
var metaData = new EventPipeEventMetaData(reader, payloadSize, _fileFormatVersionNumber, PointerSize, _processId);
_eventMetadataDictionary.Add(metaData.MetaDataId, metaData);
_eventParser.AddTemplate(metaData); // if we don't add the templates to this parse, we are going to have unhadled events (see https://github.com/Microsoft/perfview/issues/461)
int stackBytes = reader.ReadInt32();
Debug.Assert(stackBytes == 0, "Meta-data events should always have a empty stack");
}
else
{
if (_eventMetadataDictionary.TryGetValue(eventData->MetaDataId, out var metaData))
{
ret = metaData.GetEventRecordForEventData(eventData);
}
else
{
Debug.Assert(false, "Warning can't find metaData for ID " + eventData->MetaDataId.ToString("x"));
}
}
reader.Goto(eventDataEnd);
return(ret);
}
