public void ProcessStackBlock(byte[] stackBlock)
{
PinnedBuffer buffer = new PinnedBuffer(stackBlock);
if (stackBlock.Length < 8)
{
Debug.Assert(false, "Bad stack block size");
return;
}
int cursor = 0;
int firstStackId = BitConverter.ToInt32(stackBlock, cursor);
cursor += 4;
int countStackIds = BitConverter.ToInt32(stackBlock, cursor);
cursor += 4;
int nextStackId = firstStackId;
while (cursor < stackBlock.Length)
{
StackMarker marker = new StackMarker();
marker.BackingBuffer = buffer;
int stackId = nextStackId++;
marker.StackBytesSize = BitConverter.ToInt32(stackBlock, cursor);
cursor += 4;
if (cursor + marker.StackBytesSize <= stackBlock.Length)
{
marker.StackBytes = buffer.PinningHandle.AddrOfPinnedObject() + cursor;
cursor += marker.StackBytesSize;
_stacks.Add(stackId, marker);
}
else
{
Debug.Assert(false, "Stack size exceeds stack block region");
break;
}
}
Debug.Assert(nextStackId == firstStackId + countStackIds);
}
public EventMarker(PinnedBuffer buffer)
{
Buffer = buffer;
}
public unsafe void ProcessEventBlock(byte[] eventBlockData)
{
// parse the header
if (eventBlockData.Length < 20)
{
Debug.Assert(false, "Expected EventBlock of at least 20 bytes");
return;
}
ushort headerSize = BitConverter.ToUInt16(eventBlockData, 0);
if (headerSize < 20 || headerSize > eventBlockData.Length)
{
Debug.Assert(false, "Invalid EventBlock header size");
return;
}
ushort flags = BitConverter.ToUInt16(eventBlockData, 2);
bool useHeaderCompression = (flags & (ushort)EventBlockFlags.HeaderCompression) != 0;
// parse the events
PinnedBuffer buffer = new PinnedBuffer(eventBlockData);
byte * cursor = (byte *)buffer.PinningHandle.AddrOfPinnedObject();
byte * end = cursor + eventBlockData.Length;
cursor += headerSize;
EventMarker eventMarker = new EventMarker(buffer);
long timestamp = 0;
EventPipeEventHeader.ReadFromFormatV4(cursor, useHeaderCompression, ref eventMarker.Header);
if (!_threads.TryGetValue(eventMarker.Header.CaptureThreadId, out EventCacheThread thread))
{
thread = new EventCacheThread();
thread.SequenceNumber = eventMarker.Header.SequenceNumber - 1;
AddThread(eventMarker.Header.CaptureThreadId, thread);
}
eventMarker = new EventMarker(buffer);
while (cursor < end)
{
EventPipeEventHeader.ReadFromFormatV4(cursor, useHeaderCompression, ref eventMarker.Header);
bool isSortedEvent = eventMarker.Header.IsSorted;
timestamp = eventMarker.Header.TimeStamp;
int sequenceNumber = eventMarker.Header.SequenceNumber;
if (isSortedEvent)
{
thread.LastCachedEventTimestamp = timestamp;
// sorted events are the only time the captureThreadId should change
long captureThreadId = eventMarker.Header.CaptureThreadId;
if (!_threads.TryGetValue(captureThreadId, out thread))
{
thread = new EventCacheThread();
thread.SequenceNumber = sequenceNumber - 1;
AddThread(captureThreadId, thread);
}
}
int droppedEvents = (int)Math.Min(int.MaxValue, sequenceNumber - thread.SequenceNumber - 1);
if (droppedEvents > 0)
{
OnEventsDropped?.Invoke(droppedEvents);
}
else
{
// When a thread id is recycled the sequenceNumber can abruptly reset to 1 which
// makes droppedEvents go negative
Debug.Assert(droppedEvents == 0 || sequenceNumber == 1);
}
thread.SequenceNumber = sequenceNumber;
if (isSortedEvent)
{
SortAndDispatch(timestamp);
OnEvent?.Invoke(ref eventMarker.Header);
}
else
{
thread.Events.Enqueue(eventMarker);
}
cursor += eventMarker.Header.TotalNonHeaderSize + eventMarker.Header.HeaderSize;
EventMarker lastEvent = eventMarker;
eventMarker = new EventMarker(buffer);
eventMarker.Header = lastEvent.Header;
}
thread.LastCachedEventTimestamp = timestamp;
}