[foreign-jextract] RFR: 8264187: Add a method for creating a slicing MethodHandle

[Maurizio Cimadamore]

On Fri, 26 Mar 2021 14:40:14 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> test/jdk/java/foreign/TestLayoutPaths.java line 533:
>> 
>>> 531:         MethodHandle sliceHandle;
>>> 532:         try {
>>> 533:             sliceHandle = layout.sliceHandle(groupElement("y")); // should work
>> 
>> Question: why is the failure dynamic? We know exactly, at construction time that the offset is gonna be odd?
>
> That is true in this case, but not in general where the offset could depend on some dynamic indexes.
> 
> However, I could change it to eagerly do the offset check in case we don't have any free dimensions.

ugh - you mean accessing something like 3bit value array in the 8th element? Yeah...

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PR: https://git.openjdk.java.net/panama-foreign/pull/477