RFR: 8178813: Add test for G1 pre-barrier on dereference of weak JNI handles

[Kim Barrett]

> On May 5, 2017, at 6:19 PM, Kim Barrett <kim.barrett at oracle.com> wrote:
> 
>> On May 5, 2017, at 7:58 AM, Mikael Gerdin <mikael.gerdin at oracle.com> wrote:
>> 
>> Hi Kim,
>> 
>> On 2017-05-05 07:45, Kim Barrett wrote:
>>> Still looking for reviewers.
>>> 
>>>> On Apr 14, 2017, at 4:41 PM, Kim Barrett <kim.barrett at oracle.com> wrote:
>>>> 
>>>> Please review this new test of the handling of weak JNI handles during
>>>> G1 concurrent mark.
>>>> 
>>>> CR:
>>>> https://bugs.openjdk.java.net/browse/JDK-8178813
>>>> 
>>>> Webrev:
>>>> http://cr.openjdk.java.net/~kbarrett/8178813/hotspot.00/
>> 
>> Test seems ok to me, I might have made the "static boolean resolve" an instance member and created two different instances of the test class because I dislike that kind of state in static members but I'm not going to block the change because of it.
> 
> I think you are right, and I’m going to change it along those lines.  New webrev will be forthcoming.

full: http://cr.openjdk.java.net/~kbarrett/8178813/hotspot.01/
incr: http://cr.openjdk.java.net/~kbarrett/8178813/hotspot.01.inc/