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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.
#ifndef __EVENTPIPE_BLOCK_H__
#define __EVENTPIPE_BLOCK_H__
#ifdef FEATURE_PERFTRACING
#include "eventpipeeventinstance.h"
#include "fastserializableobject.h"
#include "fastserializer.h"
class EventPipeBlock : public FastSerializableObject
{
public:
EventPipeBlock(unsigned int maxBlockSize);
~EventPipeBlock();
// Write an event to the block.
// Returns:
// - true: The write succeeded.
// - false: The write failed. In this case, the block should be considered full.
bool WriteEvent(EventPipeEventInstance &instance);
void Clear();
const char* GetTypeName()
{
LIMITED_METHOD_CONTRACT;
return "EventBlock";
}
void FastSerialize(FastSerializer *pSerializer)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_PREEMPTIVE;
PRECONDITION(pSerializer != NULL);
}
CONTRACTL_END;
if (m_pBlock == NULL)
{
return;
}
unsigned int eventsSize = (unsigned int)(m_pWritePointer - m_pBlock);
pSerializer->WriteBuffer((BYTE*)&eventsSize, sizeof(eventsSize));
if (eventsSize == 0)
{
return;
}
size_t currentPosition = pSerializer->GetCurrentPosition();
if (currentPosition % ALIGNMENT_SIZE != 0)
{
BYTE maxPadding[ALIGNMENT_SIZE - 1] = {}; // it's longest possible padding, we are going to use only part of it
unsigned int paddingLength = ALIGNMENT_SIZE - (currentPosition % ALIGNMENT_SIZE);
pSerializer->WriteBuffer(maxPadding, paddingLength); // we write zeros here, the reader is going to always read from the first aligned address of the serialized content
_ASSERTE(pSerializer->GetCurrentPosition() % ALIGNMENT_SIZE == 0);
}
pSerializer->WriteBuffer(m_pBlock, eventsSize);
}
private:
BYTE *m_pBlock;
BYTE *m_pWritePointer;
BYTE *m_pEndOfTheBuffer;
unsigned int GetSize() const
{
LIMITED_METHOD_CONTRACT;
if (m_pBlock == NULL)
{
return 0;
}
return (unsigned int)(m_pEndOfTheBuffer - m_pBlock);
}
};
#endif // FEATURE_PERFTRACING
#endif // __EVENTPIPE_BLOCK_H__
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