[foreign] RFR 8219103: Add an offsetOf utility to find the offset of Struct fields

[Jorn Vernee]

Updated webrev: 
http://cr.openjdk.java.net/~jvernee/panama/webrevs/8219103/webrev.01/

There was only 1 reference to sizeOf in our code, I re-ran the tests as 
well.

Jorn

Sundararajan Athijegannathan schreef op 2019-02-15 17:06:
> I'm fine with that.
> 
> -Sundar
> 
> On 15/02/19, 9:27 PM, Jorn Vernee wrote:
>> Subtle - I didn't notice that, thanks.
>> 
>> I'd say we go with sizeOf/offsetOf, since it fits better with the rest 
>> of the Java API (e.g. Struct.toString).
>> 
>> Jorn
>> 
>> Sundararajan Athijegannathan schreef op 2019-02-15 16:38:
>>> Struct has "sizeof" but "offsetOf" ? Either sizeOf / offsetOf or
>>> sizeof/offsetof (latter if we want to mimic C operator/macro).
>>> 
>>> -Sundar
>>> 
>>> On 15/02/19, 8:57 PM, Jorn Vernee wrote:
>>>> Hi,
>>>> 
>>>> This is an RFR for the earlier proposed offsetOf utility for finding 
>>>> the offset of a field of a struct.
>>>> 
>>>> This is based on Maurizio's suggestion to use the LayoutPath API 
>>>> [1], with some minor tweaks and a test added.
>>>> 
>>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8219103
>>>> Webrev: 
>>>> http://cr.openjdk.java.net/~jvernee/panama/webrevs/8219103/webrev.00/
>>>> 
>>>> Thanks,
>>>> Jorn
>>>> 
>>>> [1] : 
>>>> https://mail.openjdk.java.net/pipermail/panama-dev/2019-February/004360.html