// pack the argv data and emit the event using TraceEvent
internal unsafe override uint EventWrite(EventTrace.Event eventID, EventTrace.Keyword keywords, EventTrace.Level level, int argc, EventData *argv)
{
ClassicEtw.EVENT_HEADER header;
header.Header.ClientContext = 0;
header.Header.Flags = ClassicEtw.WNODE_FLAG_TRACED_GUID | ClassicEtw.WNODE_FLAG_USE_MOF_PTR;
header.Header.Guid = EventTrace.GetGuidForEvent(eventID);
header.Header.Level = (byte)level;
header.Header.Type = (byte)EventTrace.GetOpcodeForEvent(eventID);
header.Header.Version = (ushort)EventTrace.GetVersionForEvent(eventID);
// Extra copy on XP to move argv to the end of the EVENT_HEADER
EventData *eventData = &header.Data;
if (argc > ClassicEtw.MAX_MOF_FIELDS)
{
// Data will be lost on XP
argc = ClassicEtw.MAX_MOF_FIELDS;
}
header.Header.Size = (ushort)(argc * sizeof(EventData) + 48);
for (int x = 0; x < argc; x++)
{
eventData[x].Ptr = argv[x].Ptr;
eventData[x].Size = argv[x].Size;
}
return(ClassicEtw.TraceEvent(_traceHandle, &header));
}
internal unsafe override uint EventWrite(EventTrace.Event eventID, EventTrace.Keyword keywords, EventTrace.Level level, int argc, EventData *argv)
{
ManifestEtw.EventDescriptor eventDescriptor;
eventDescriptor.Id = (ushort)eventID;
eventDescriptor.Version = EventTrace.GetVersionForEvent(eventID);
eventDescriptor.Channel = 0x10; // Since Channel isn't supported on XP we only use a single default channel.
eventDescriptor.Level = (byte)level;
eventDescriptor.Opcode = EventTrace.GetOpcodeForEvent(eventID);
eventDescriptor.Task = EventTrace.GetTaskForEvent(eventID);
eventDescriptor.Keywords = (long)keywords;
if (argc == 0)
{
argv = null;
}
return(ManifestEtw.EventWrite(_registrationHandle.Value, ref eventDescriptor, (uint)argc, argv));
}
// Optimization for 0-1 arguments
internal unsafe uint TraceEvent(EventTrace.Event eventID, EventTrace.Keyword keywords, EventTrace.Level level, object eventData)
{
// It is the responsibility of the caller to check that flags/keywords are enabled before calling this method
Debug.Assert(IsEnabled(keywords, level));
uint status = 0;
int argCount = 0;
EventData userData;
userData.Size = 0;
string dataString = null;
byte * dataBuffer = stackalloc byte[s_basicTypeAllocationBufferSize];
if (eventData != null)
{
dataString = EncodeObject(ref eventData, &userData, dataBuffer);
argCount = 1;
}
if (userData.Size > s_traceEventMaximumSize)
{
return(ErrorEventTooBig);
}
if (dataString != null)
{
fixed(char *pdata = dataString)
{
userData.Ptr = (ulong)pdata;
status = EventWrite(eventID, keywords, level, argCount, &userData);
}
}
else
{
status = EventWrite(eventID, keywords, level, argCount, &userData);
}
return(status);
}
internal static void EmitEvent(EventTrace.Event evt)
{
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordXPS, EventTrace.Level.Info, evt);
}
internal uint TraceEvent(EventTrace.Event eventID, EventTrace.Keyword keywords, EventTrace.Level level)
{
// Optimization for 0-1 arguments
return(TraceEvent(eventID, keywords, level, (object)null));
}
internal unsafe abstract uint EventWrite(EventTrace.Event eventID, EventTrace.Keyword keywords, EventTrace.Level level, int argc, EventData *argv);
internal unsafe uint TraceEvent(EventTrace.Event eventID, EventTrace.Keyword keywords, EventTrace.Level level, params object[] eventPayload)
{
// It is the responsibility of the caller to check that flags/keywords are enabled before calling this method
Debug.Assert(IsEnabled(keywords, level));
int argCount = eventPayload.Length;
Debug.Assert(argCount <= s_etwMaxNumberArguments);
uint totalEventSize = 0;
int stringIndex = 0;
int[] stringPosition = new int[s_etwAPIMaxStringCount];
string [] dataString = new string[s_etwAPIMaxStringCount];
EventData *userData = stackalloc EventData[argCount];
EventData *userDataPtr = userData;
byte * dataBuffer = stackalloc byte[s_basicTypeAllocationBufferSize * argCount];
byte * currentBuffer = dataBuffer;
for (int index = 0; index < argCount; index++)
{
if (eventPayload[index] != null)
{
string isString = EncodeObject(ref eventPayload[index], userDataPtr, currentBuffer);
currentBuffer += s_basicTypeAllocationBufferSize;
totalEventSize = userDataPtr->Size;
userDataPtr++;
if (isString != null)
{
Debug.Assert(stringIndex < s_etwAPIMaxStringCount); // need to increase string count or emit fewer strings
dataString[stringIndex] = isString;
stringPosition[stringIndex] = index;
stringIndex++;
}
}
}
if (totalEventSize > s_traceEventMaximumSize)
{
return(ErrorEventTooBig);
}
fixed(char *s0 = dataString[0], s1 = dataString[1], s2 = dataString[2], s3 = dataString[3],
s4 = dataString[4], s5 = dataString[5], s6 = dataString[6], s7 = dataString[7])
{
userDataPtr = userData;
if (dataString[0] != null)
{
userDataPtr[stringPosition[0]].Ptr = (ulong)s0;
}
if (dataString[1] != null)
{
userDataPtr[stringPosition[1]].Ptr = (ulong)s1;
}
if (dataString[2] != null)
{
userDataPtr[stringPosition[2]].Ptr = (ulong)s2;
}
if (dataString[3] != null)
{
userDataPtr[stringPosition[3]].Ptr = (ulong)s3;
}
if (dataString[4] != null)
{
userDataPtr[stringPosition[4]].Ptr = (ulong)s4;
}
if (dataString[5] != null)
{
userDataPtr[stringPosition[5]].Ptr = (ulong)s5;
}
if (dataString[6] != null)
{
userDataPtr[stringPosition[6]].Ptr = (ulong)s6;
}
if (dataString[7] != null)
{
userDataPtr[stringPosition[7]].Ptr = (ulong)s7;
}
return(EventWrite(eventID, keywords, level, argCount, userData));
}
}
