RFR (S): 8198561: Make oop and narrowOop always have their own class type

[coleen.phillimore at oracle.com]

Hi Erik,

This looks great.   I assume that the generated code (for these classes 
vs. oopDesc* and juint) comes out the same?

thanks,
Coleen

On 2/26/18 8:32 AM, Erik Österlund wrote:
> Hi,
>
> Making oop sometimes map to class types and sometimes to primitives 
> comes with some unfortunate problems. Advantages of making them always 
> have their own type include:
>
> 1) Not getting compilation errors in configuration X but not Y
> 2) Making it easier to adopt existing code to use Shenandoah equals 
> barriers
> 3) Recognize oops and narrowOops safely in template
>
> Therefore, I would like to make both oop and narrowOop always map to a 
> class type consistently.
>
> Webrev:
> http://cr.openjdk.java.net/~eosterlund/8198561/webrev.00/
>
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8198561
>
> Thanks,
> /Erik