RFR: 8153749 - New capability can_generate_early_class_hook_events

[Dmitry Samersoff]

Serguei,

Looks good for me.

-Dmitry


On 2016-04-14 11:24, serguei.spitsyn at oracle.com wrote:
> Please, review the Jigsaw-related fix for:
>   https://bugs.openjdk.java.net/browse/JDK-8153749
> 
> 
> Hotspot webrev:
> http://cr.openjdk.java.net/~sspitsyn/webrevs/2016/hotspot/8153749-Jigsaw-newcap.hs1/
> 
> 
> Jdk webrev:
> http://cr.openjdk.java.net/~sspitsyn/webrevs/2016/jdk/8153749-Jigsaw-newcap.jdk1/
> 
> 
> 
> Summary:
> 
>    This is a Jigsaw related enhancement.
>    Some agents need to get a CFLH event for classes loaded in the
> primordial phase.
>    This is not possible in JDK 9 because existing agents may instrument
> code in the
>    primordial or start phase before the module system has completed
> initialization.
> 
>    We introduce a new capability: can_generate_early_class_hook_events.
>    If this capability and can_generate_all_class_hook_events are enabled
> then
>    the CFLH event could be posted for classes loaded in the primordial
> phase.
>    We leave can_generate_early_vmstart as is, no changes.
> 
>    This enhancement needs a CCC request filed.
>    I will file it once the JVMTI spec changes are reviewed.
> 
> 
> Testing:
>    Altered the nsk.jvmti co-located test
> nsk/jvmti/ClassFileLoadHook/classfloadhk002
>    to enable the can_generate_early_class_hook_events and checked that
> new CFLH events
>    are posted in the primordial phase and also they are not posted
> otherwise.
> 
> 
> Thanks,
> Serguei
> 


-- 
Dmitry Samersoff
Oracle Java development team, Saint Petersburg, Russia
* I would love to change the world, but they won't give me the sources.