RFR: 8212996: Use AS_NO_KEEPALIVE when accessing dead java.lang.invoke.CallSites during nmethod unloading

[Per Liden]

Hi Erik,

On 10/25/18 9:29 PM, Erik Österlund wrote:
> Hi,
> 
> When nmethods are unloaded, they may have dead 
> java.lang.invoke.CallSites loaded, and then we follow their dead 
> java.lang.invoke.MethodHandleNatives.CallSiteContext, so that its 
> dependency context can be cleaned. These dead oops should be loaded with 
> AS_NO_KEEPALIVE accessors, otherwise GC barriers can become very unhappy.
> 
> Webrev:
> http://cr.openjdk.java.net/~eosterlund/8212996/webrev.00/

Looks good to me!

/Per

> 
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8212996
> 
> Thanks,
> /Erik