BlittablePtrMarshalling.txt

MarshalHelpers.cs

else if (MarshalUtils.IsBlittableType(type) && !isField)
{
    if (nativeType == NativeTypeKind.Invalid || nativeType == NativeTypeKind.LPStruct)
        return MarshallerKind.BlittablePtr;
    else
        return MarshallerKind.Invalid;
}

Marshaller.cs

    class BlittablePtrMarshaller : Marshaller
    {
        protected override void AllocManagedToNative(ILCodeStream codeStream)
        {
            if (IsManagedByRef)
            {
                // For byrefs, we might need to allocate something
                throw new NotSupportedException();
            }
        }

        protected override void TransformManagedToNative(ILCodeStream codeStream)
        {
            ILEmitter emitter = _ilCodeStreams.Emitter;
            ILCodeLabel lNullValue = emitter.NewCodeLabel();
            ILToken tokGetRawData = emitter.NewToken(Context.GetWellKnownType(WellKnownType.Object).GetKnownMethod("GetRawData", null));

            LoadManagedValue(codeStream);
            codeStream.Emit(ILOpcode.brfalse, lNullValue);

            ILLocalVariable vPinnedLocal = emitter.NewLocal(ManagedType, isPinned: true);
            LoadManagedValue(codeStream);
            codeStream.EmitStLoc(vPinnedLocal);
            codeStream.EmitLdLoc(vPinnedLocal);
            codeStream.Emit(ILOpcode.call, tokGetRawData);
            codeStream.Emit(ILOpcode.conv_u);
            StoreNativeValue(codeStream);
            codeStream.EmitLabel(lNullValue);
        }

        protected override void AllocNativeToManaged(ILCodeStream codeStream)
        {
            throw new NotSupportedException();
        }

        protected override void TransformNativeToManaged(ILCodeStream codeStream)
        {
            // Nothing to do since right now we just pin
        }
    }