some thoughts on panama/jextract

[Maurizio Cimadamore]

On 07/01/2020 04:24, Michael Zucchi wrote:
> I think most of my initial concerns have been addressed so I will work 
> on porting some of my code and am interested to see how it works in 
> practice.  (but no jextract for now!) 

Thanks - I've took a look at your APIs and, since they look generally 
clean and high-level - I believe they can relatively easily be ported to 
use the MemoryAddress/MethodHandle machinery in the foreign-abi branch.

Without an extractor you will have to write some mechanical code by hand 
though - some examples of how to do that:

http://hg.openjdk.java.net/panama/dev/file/foreign-abi/test/jdk/java/foreign/StdLibTest.java

I believe you can use the same approach to implement your library 
without using JNI. I see you have many 'wrappers' with a 'long' address 
field - you will have to replace them with a MemoryAddress field (if 
these structs are to be passed by pointer - or MemorySegment if you want 
to pass them by value). Then you have to setup the required method 
handles to be able to call the native functions you want.

Cheers
Maurizio