jextract generates downcallHandles where I need upcallStubs

[Maurizio Cimadamore]

On 15/12/2020 12:45, Maurizio Cimadamore wrote:
> This is, I think, the bit of ingredient that's missing - and I think 
> it's a plain bug: while jextract looks at regular function to see if 
> their signature mentions a function pointer, the same is not done for 
> struct fields. 

Filed this:

https://bugs.openjdk.java.net/browse/JDK-8258405

Thanks again
Maurizio