private static unsafe void WriteObjectGraphToDisk(byte *stackAllocatedData, Stream stream, Dictionary <object, long> serializedObjectMap, Queue <object> objectQueue, RuntimeTypeHandleDictionary mtTokenMap, ref long lastReservedObjectEnd)
{
long nextObjectHeaderFilePointer = 0;
while (objectQueue.Count != 0)
{
object o = objectQueue.Dequeue();
ref TypeInfo typeInfo = ref mtTokenMap.GetOrAddValueRef(Type.GetTypeHandle(o));
long mtToken;
if (typeInfo != null)
{
mtToken = typeInfo.MTToken;
}
else
{
mtToken = mtTokenMap.Count - 1;
typeInfo = GetObjectInfo(o, mtToken);
}
long hashCode = (RuntimeHelpers.GetHashCode(o) & 0x0fffffff) | (1 << 27) | (1 << 26);
fixed(byte *data = &GetRawData(o))
{
MethodTable *mt;
if (IntPtr.Size == 8)
{
*(long *)stackAllocatedData = hashCode;
*(long *)(stackAllocatedData + 8) = mtToken;
stream.Write(new ReadOnlySpan <byte>(stackAllocatedData, 16));
mt = (MethodTable *)*(long *)(data - IntPtr.Size);
}
else
{
*(int *)stackAllocatedData = (int)hashCode;
*(int *)(stackAllocatedData + 4) = (int)mtToken;
stream.Write(new ReadOnlySpan <byte>(stackAllocatedData, 8));
mt = (MethodTable *)*(int *)(data - IntPtr.Size);
}
uint flags = mt->Flags;
bool hasComponentSize = (flags & 0x80000000) == 0x80000000;
long objectSize = mt->BaseSize;
if (hasComponentSize)
{
var numComponents = (long)*(int *)data;
objectSize += numComponents * mt->ComponentSize;
}
var remainingSize = objectSize - IntPtr.Size - IntPtr.Size; // because we have already written the object header and MT Token
if (remainingSize <= int.MaxValue)
{
stream.Write(new ReadOnlySpan <byte>(data, (int)remainingSize));
}
else
{
WriteLargeObject(stream, data, remainingSize);
}
bool containsPointersOrCollectible = (flags & 0x10000000) == 0x10000000 || (flags & 0x1000000) == 0x1000000;
if (containsPointersOrCollectible)
{
var gcdesc = new GCDesc(typeInfo.GCDescData, typeInfo.GCDescSize);
gcdesc.EnumerateObject(data, objectSize, serializedObjectMap, objectQueue, stream, nextObjectHeaderFilePointer, ref lastReservedObjectEnd);
}
nextObjectHeaderFilePointer += objectSize + Padding(objectSize, IntPtr.Size);
stream.Seek(nextObjectHeaderFilePointer, SeekOrigin.Begin);
}
}
