/// <summary>
/// Reads the minimal information about type layout encoded in the
/// MethodTable. That doesn't include field information.
/// </summary>
public unsafe override ComputedInstanceFieldLayout ComputeInstanceLayout(DefType type, InstanceLayoutKind layoutKind)
{
// If we need the field information, delegate to the native layout algorithm or metadata algorithm
if (layoutKind != InstanceLayoutKind.TypeOnly)
{
if (type.HasNativeLayout)
{
return(s_nativeLayoutFieldAlgorithm.ComputeInstanceLayout(type, layoutKind));
}
else
{
#if SUPPORTS_NATIVE_METADATA_TYPE_LOADING
return(_metadataFieldLayoutAlgorithm.ComputeInstanceLayout(type, layoutKind));
#else
Debug.Assert(false);
return(default);
/// <summary>
/// Reads the minimal information about type layout encoded in the
/// EEType. That doesn't include field information.
/// </summary>
public unsafe override ComputedInstanceFieldLayout ComputeInstanceLayout(DefType type, InstanceLayoutKind layoutKind)
{
// If we need the field information, delegate to the native layout algorithm or metadata algorithm
if (layoutKind != InstanceLayoutKind.TypeOnly)
{
if (type.HasNativeLayout)
{
return(s_nativeLayoutFieldAlgorithm.ComputeInstanceLayout(type, layoutKind));
}
else
{
return(_metadataFieldLayoutAlgorithm.ComputeInstanceLayout(type, layoutKind));
}
}
type.RetrieveRuntimeTypeHandleIfPossible();
Debug.Assert(!type.RuntimeTypeHandle.IsNull());
EEType *eeType = type.RuntimeTypeHandle.ToEETypePtr();
ComputedInstanceFieldLayout layout = new ComputedInstanceFieldLayout()
{
ByteCountAlignment = new LayoutInt(IntPtr.Size),
ByteCountUnaligned = new LayoutInt(eeType->IsInterface ? IntPtr.Size : checked ((int)eeType->FieldByteCountNonGCAligned)),
FieldAlignment = new LayoutInt(eeType->FieldAlignmentRequirement),
Offsets = (layoutKind == InstanceLayoutKind.TypeOnly) ? null : Array.Empty <FieldAndOffset>(), // No fields in EETypes
PackValue = 0, // This isn't explicitly encoded, though FieldSize should take it into account
// TODO, as we add more metadata handling logic, find out if its necessary.
};
if (eeType->IsValueType)
{
int valueTypeSize = checked ((int)eeType->ValueTypeSize);
layout.FieldSize = new LayoutInt(valueTypeSize);
}
else
{
layout.FieldSize = new LayoutInt(IntPtr.Size);
}
if ((eeType->RareFlags & EETypeRareFlags.RequiresAlign8Flag) == EETypeRareFlags.RequiresAlign8Flag)
{
layout.ByteCountAlignment = new LayoutInt(8);
}
return(layout);
}