RFR: 8197454: Need Access decorator for storing oop into uninitialized location

[Erik Österlund]

Hi Kim,

Looks good.
This decorator was renamed to have the ARRAYCOPY_ prefix after 
discovering it was only used by arraycopy. But if you have a different 
use case that needs to perform stores on uninitialized memory, then I 
support this change.

Thanks,
/Erik

On 2018-02-11 08:25, Kim Barrett wrote:
> Please review this change to the Access API to support stores of oops
> into uninitialized locations.  This change is needed to prevent such
> stores from, for example, having the G1 pre-barrier applied to
> whatever garbage happens to be in the location being stored into.
>
> There was already support for stores to uninitialized locations in the
> Access API, but only for array initialization.  This change
> generalizes that mechanism, and renames it accordingly:
> ARRAYCOPY_DEST_NOT_INITIALIZED => AS_DEST_NOT_INITIALIZED.
>
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8197454
>
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8197454/open.00/
>
> Testing:
> Mach5 {hs,jdk}-tier{1,2,3}
>