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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include "common.h"
#include "eventpipemetadatagenerator.h"
#include "eventpipe.h"
#ifdef FEATURE_PERFTRACING
BYTE* EventPipeMetadataGenerator::GenerateEventMetadata(
unsigned int eventID,
LPCWSTR pEventName,
INT64 keywords,
unsigned int version,
EventPipeEventLevel level,
EventPipeParameterDesc *pParams,
unsigned int paramCount,
size_t &metadataLength)
{
CONTRACTL
{
THROWS;
GC_NOTRIGGER;
MODE_ANY;
PRECONDITION(pEventName != NULL);
PRECONDITION(paramCount == 0 || pParams != NULL);
}
CONTRACTL_END;
// eventID : 4 bytes
// eventName : (eventName.Length + 1) * 2 bytes
// keywords : 8 bytes
// eventVersion : 4 bytes
// level : 4 bytes
// parameterCount : 4 bytes
size_t eventNameLength = wcslen(pEventName);
metadataLength = 24 + ((eventNameLength + 1) * sizeof(WCHAR));
// Each parameter has a 4 byte TypeCode + (parameterName.Length + 1) * 2 bytes.
for(unsigned int i=0; i<paramCount; i++)
{
_ASSERTE(pParams[i].Name != NULL);
metadataLength += (4 + ((wcslen(pParams[i].Name) + 1) * sizeof(WCHAR)));
}
// Allocate a metadata blob.
BYTE *pMetadata = new BYTE[metadataLength];
BYTE *pCurrent = pMetadata;
// Write the event ID.
*((unsigned int *)pCurrent) = eventID;
pCurrent += sizeof(unsigned int);
// Write the event name.
wcsncpy((WCHAR *)pCurrent, pEventName, eventNameLength);
pCurrent += eventNameLength * sizeof(WCHAR);
*((WCHAR *)pCurrent) = W('\0');
pCurrent += sizeof(WCHAR);
// Write the keywords.
*((INT64 *)pCurrent) = keywords;
pCurrent += sizeof(INT64);
// Write the version.
*((unsigned int *)pCurrent) = version;
pCurrent += sizeof(unsigned int);
// Write the level.
*((unsigned int *)pCurrent) = (unsigned int)level;
pCurrent += sizeof(unsigned int);
// Write the parameter count.
*((unsigned int *)pCurrent) = paramCount;
pCurrent += sizeof(unsigned int);
// Write the parameter descriptions.
for(unsigned int i=0; i<paramCount; i++)
{
EventPipeParameterDesc *pParam = &pParams[i];
*((unsigned int *)pCurrent) = (unsigned int)pParam->Type;
pCurrent += sizeof(unsigned int);
size_t parameterNameLength = wcslen(pParam->Name);
wcsncpy((WCHAR *)pCurrent, pParam->Name, parameterNameLength);
pCurrent += parameterNameLength * sizeof(WCHAR);
*((WCHAR *)pCurrent) = W('\0');
pCurrent += sizeof(WCHAR);
}
_ASSERTE(metadataLength == (pCurrent - pMetadata));
return pMetadata;
}
#endif // FEATURE_PERFTRACING
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