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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 "eventpipebuffer.h"
#include "eventpipeconfiguration.h"
#include "eventpipefile.h"
#ifdef FEATURE_PERFTRACING
EventPipeFile::EventPipeFile(
SString &outputFilePath
#ifdef _DEBUG
,
bool lockOnWrite
#endif // _DEBUG
)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
m_pSerializer = new FastSerializer(outputFilePath, *this);
m_serializationLock.Init(LOCK_TYPE_DEFAULT);
m_pMetadataLabels = new MapSHashWithRemove<EventPipeEvent*, StreamLabel>();
#ifdef _DEBUG
m_lockOnWrite = lockOnWrite;
#endif // _DEBUG
// File start time information.
GetSystemTime(&m_fileOpenSystemTime);
QueryPerformanceCounter(&m_fileOpenTimeStamp);
QueryPerformanceFrequency(&m_timeStampFrequency);
// Write a forward reference to the beginning of the event stream.
// This also allows readers to know where the event stream ends and skip it if needed.
m_beginEventsForwardReferenceIndex = m_pSerializer->AllocateForwardReference();
m_pSerializer->WriteForwardReference(m_beginEventsForwardReferenceIndex);
// Write the header information into the file.
// Write the current date and time.
m_pSerializer->WriteBuffer((BYTE*)&m_fileOpenSystemTime, sizeof(m_fileOpenSystemTime));
// Write FileOpenTimeStamp
m_pSerializer->WriteBuffer((BYTE*)&m_fileOpenTimeStamp, sizeof(m_fileOpenTimeStamp));
// Write ClockFrequency
m_pSerializer->WriteBuffer((BYTE*)&m_timeStampFrequency, sizeof(m_timeStampFrequency));
}
EventPipeFile::~EventPipeFile()
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
// Mark the end of the event stream.
StreamLabel currentLabel = m_pSerializer->GetStreamLabel();
// Define the event start forward reference.
m_pSerializer->DefineForwardReference(m_beginEventsForwardReferenceIndex, currentLabel);
// Close the serializer.
if(m_pSerializer != NULL)
{
delete(m_pSerializer);
m_pSerializer = NULL;
}
}
void EventPipeFile::WriteEvent(EventPipeEventInstance &instance)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
#ifdef _DEBUG
if(m_lockOnWrite)
{
// Take the serialization lock.
// This is used for synchronous file writes.
// The circular buffer path only writes from one thread.
SpinLockHolder _slh(&m_serializationLock);
}
#endif // _DEBUG
// Check to see if we've seen this event type before.
// If not, then write the event metadata to the event stream first.
StreamLabel metadataLabel = GetMetadataLabel(*instance.GetEvent());
if(metadataLabel == 0)
{
EventPipeEventInstance* pMetadataInstance = EventPipe::GetConfiguration()->BuildEventMetadataEvent(instance);
metadataLabel = m_pSerializer->GetStreamLabel();
pMetadataInstance->FastSerialize(m_pSerializer, (StreamLabel)0); // 0 breaks recursion and represents the metadata event.
SaveMetadataLabel(*instance.GetEvent(), metadataLabel);
delete[] (pMetadataInstance->GetData());
delete (pMetadataInstance);
}
// Write the event to the stream.
instance.FastSerialize(m_pSerializer, metadataLabel);
}
StreamLabel EventPipeFile::GetMetadataLabel(EventPipeEvent &event)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
StreamLabel outLabel;
if(m_pMetadataLabels->Lookup(&event, &outLabel))
{
_ASSERTE(outLabel != 0);
return outLabel;
}
return 0;
}
void EventPipeFile::SaveMetadataLabel(EventPipeEvent &event, StreamLabel label)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
PRECONDITION(label > 0);
}
CONTRACTL_END;
// If a pre-existing metadata label exists, remove it.
StreamLabel outLabel;
if(m_pMetadataLabels->Lookup(&event, &outLabel))
{
m_pMetadataLabels->Remove(&event);
}
// Add the metadata label.
m_pMetadataLabels->Add(&event, label);
}
#endif // FEATURE_PERFTRACING
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