private void ReadAndDispatchTraceEvent(EventMetadata eventMetadata)
{
// Read the thread id.
var threadId = _deserializer.ReadInt();
// Read the time stamp.
var timeStamp = _deserializer.ReadInt64();
// Ensure that timestamps are properly ordered.
System.Diagnostics.Debug.Assert(_lastTimestamp <= timeStamp);
_lastTimestamp = timeStamp;
// Read the activity id.
Guid activityId;
_deserializer.Read(out activityId);
// Read the related activity id.
Guid relatedActivityId;
_deserializer.Read(out relatedActivityId);
// Read the event payload size.
var payloadSize = _deserializer.ReadInt();
Debug.Assert(payloadSize >= 0, "Payload size should not be negative.");
// Allocate memory for the event payload.
var payload = new byte[payloadSize];
for (uint i = 0; i < payloadSize; i++)
{
// Copy the payload.
payload[i] = _deserializer.ReadByte();
}
// Dispatch the event.
Dispatch(SynthesizeTraceEvent(eventMetadata, threadId, timeStamp, activityId, relatedActivityId, payload));
// Read the optional stack.
var stackSize = _deserializer.ReadInt();
Debug.Assert(stackSize >= 0, "Stack size should not be negative.");
// The book keeping event itself will be discarded.
// The call stack is not interesting.
if (IsBookKeepingEvent(eventMetadata))
{
_deserializer.Goto(_deserializer.Current + (uint)stackSize);
}
else
{
if (stackSize > 0)
{
// Allocate memory for the stack if it's not empty
var stack = new byte[stackSize];
// Copy the stack
for (uint i = 0; i < stackSize; i++)
{
stack[i] = _deserializer.ReadByte();
}
Dispatch(SynthesizeThreadStackWalkEvent(threadId, stack));
}
}
}
private void ReadAndUpdateEventMetadataDictionary(StreamLabel eventStart)
{
var eventMetadata = new EventMetadata();
// Skip the EventPipeEvent common fields which are not related to metedata
int commonFieldSize = sizeof(int) // ThreadId
+ sizeof(Int64) // Timestamp
+ sizeof(Guid) // ActivityId
+ sizeof(Guid); // RelatedActivityId
_deserializer.Goto(_deserializer.Current + (uint)commonFieldSize);
// Read the event payload size.
var payloadSize = _deserializer.ReadInt();
Debug.Assert(payloadSize >= 0, "Payload size should not be negative.");
if (_version == 1)
{
var providerId = Guid.Empty;
_deserializer.Read(out providerId);
eventMetadata.ProviderId = providerId;
}
else
{
eventMetadata.ProviderName = _deserializer.ReadNullTerminatedUnicodeString();
}
eventMetadata.EventId = (uint)_deserializer.ReadInt();
eventMetadata.Version = (uint)_deserializer.ReadInt();
var metadataPayloadLength = (uint)_deserializer.ReadInt();
if (metadataPayloadLength > 0)
{
var payloadIdentifierLength = 0;
if (_version == 1)
{
payloadIdentifierLength = sizeof(Guid);
}
else
{
payloadIdentifierLength = (eventMetadata.ProviderName.Length + 1) * sizeof(Char); // +1 for null-terminator
}
var actualPayloadSize = payloadIdentifierLength
+ sizeof(int) // EventId
+ sizeof(int) // Version
+ sizeof(int) // MetadataPayloadLength
+ metadataPayloadLength;
Debug.Assert(payloadSize == actualPayloadSize, $"The total event payload size is {actualPayloadSize}. But it is expected to be {payloadSize}.");
// Read EventSource definition: https://github.com/dotnet/coreclr/blob/release/2.0.0/src/mscorlib/shared/System/Diagnostics/Tracing/EventSource.cs#L708
eventMetadata.EventId = (uint)_deserializer.ReadInt();
eventMetadata.EventName = _deserializer.ReadNullTerminatedUnicodeString();
eventMetadata.Keywords = (ulong)_deserializer.ReadInt64();
eventMetadata.Version = (uint)_deserializer.ReadInt();
eventMetadata.Level = (uint)_deserializer.ReadInt();
int parameterCount = _deserializer.ReadInt();
Debug.Assert(parameterCount >= 0, "Parameter count should not be negative.");
if (parameterCount > 0)
{
eventMetadata.ParameterDefinitions = new Tuple <TypeCode, string> [parameterCount];
for (int i = 0; i < parameterCount; i++)
{
var type = (uint)_deserializer.ReadInt();
var name = _deserializer.ReadNullTerminatedUnicodeString();
eventMetadata.ParameterDefinitions[i] = new Tuple <TypeCode, string>((TypeCode)type, name);
}
}
// add a new template to event parser
_eventParser.AddTemplate(eventMetadata);
}
// Add the new event meta data into dictionary
_eventMetadataDictionary.Add(eventStart, eventMetadata);
// Read and verify stack size
_deserializer.ReadIntAndVerify(0);
}