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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 "fastserializer.h"
#ifdef FEATURE_PERFTRACING
// Event Pipe has previously implemented a feature called "forward references"
// As a result of work on V3 of Event Pipe (https://github.com/Microsoft/perfview/pull/532) it got removed
// if you need it, please use git to restore it
FastSerializer::FastSerializer(SString &outputFilePath)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
m_writeErrorEncountered = false;
m_currentPos = 0;
m_pFileStream = new CFileStream();
if(FAILED(m_pFileStream->OpenForWrite(outputFilePath)))
{
_ASSERTE(!"Unable to open file for write.");
delete(m_pFileStream);
m_pFileStream = NULL;
return;
}
WriteFileHeader();
}
FastSerializer::~FastSerializer()
{
CONTRACTL
{
NOTHROW;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
if(m_pFileStream != NULL)
{
delete(m_pFileStream);
m_pFileStream = NULL;
}
}
StreamLabel FastSerializer::GetStreamLabel() const
{
LIMITED_METHOD_CONTRACT;
return (StreamLabel)m_currentPos;
}
void FastSerializer::WriteObject(FastSerializableObject *pObject)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
PRECONDITION(pObject != NULL);
}
CONTRACTL_END;
WriteTag(FastSerializerTags::BeginObject);
WriteSerializationType(pObject);
// Ask the object to serialize itself using the current serializer.
pObject->FastSerialize(this);
WriteTag(FastSerializerTags::EndObject);
}
void FastSerializer::WriteBuffer(BYTE *pBuffer, unsigned int length)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_PREEMPTIVE;
PRECONDITION(pBuffer != NULL);
PRECONDITION(length > 0);
}
CONTRACTL_END;
if(m_writeErrorEncountered || m_pFileStream == NULL)
{
return;
}
EX_TRY
{
ULONG outCount;
m_pFileStream->Write(pBuffer, length, &outCount);
#ifdef _DEBUG
size_t prevPos = m_currentPos;
#endif
m_currentPos += outCount;
#ifdef _DEBUG
_ASSERTE(prevPos < m_currentPos);
#endif
if (length != outCount)
{
// This will cause us to stop writing to the file.
// The file will still remain open until shutdown so that we don't have to take a lock at this level when we touch the file stream.
m_writeErrorEncountered = true;
}
}
EX_CATCH
{
m_writeErrorEncountered = true;
}
EX_END_CATCH(SwallowAllExceptions);
}
void FastSerializer::WriteSerializationType(FastSerializableObject *pObject)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_PREEMPTIVE;
PRECONDITION(pObject != NULL);
}
CONTRACTL_END;
// Write the BeginObject tag.
WriteTag(FastSerializerTags::BeginObject);
// Write a NullReferenceTag, which implies that the following fields belong to SerializationType.
WriteTag(FastSerializerTags::NullReference);
// Write the SerializationType version fields.
int serializationType[2];
serializationType[0] = pObject->GetObjectVersion();
serializationType[1] = pObject->GetMinReaderVersion();
WriteBuffer((BYTE*) &serializationType, sizeof(serializationType));
// Write the SerializationType TypeName field.
const char *strTypeName = pObject->GetTypeName();
unsigned int length = (unsigned int)strlen(strTypeName);
WriteString(strTypeName, length);
// Write the EndObject tag.
WriteTag(FastSerializerTags::EndObject);
}
void FastSerializer::WriteTag(FastSerializerTags tag, BYTE *payload, unsigned int payloadLength)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_PREEMPTIVE;
}
CONTRACTL_END;
WriteBuffer((BYTE *)&tag, sizeof(tag));
if(payload != NULL)
{
_ASSERTE(payloadLength > 0);
WriteBuffer(payload, payloadLength);
}
}
void FastSerializer::WriteFileHeader()
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
const char *strSignature = "!FastSerialization.1"; // the consumer lib expects exactly the same string, it must not be changed
unsigned int length = (unsigned int)strlen(strSignature);
WriteString(strSignature, length);
}
void FastSerializer::WriteString(const char *strContents, unsigned int length)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_PREEMPTIVE;
}
CONTRACTL_END;
// Write the string length .
WriteBuffer((BYTE*) &length, sizeof(length));
// Write the string contents.
WriteBuffer((BYTE*) strContents, length);
}
#endif // FEATURE_PERFTRACING
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