RFR 8167372: Add code to check for getting oops while thread is in native

[Aleksey Shipilev]

On 11/16/2017 02:38 PM, harold seigel wrote:
> Hi,
> 
> Please review this JDK-10 enhancement for bug JDK-8167372.  As described in the bug, this fix helps
> check for naked oops.  The fix was tested with JCK lang and VM tests, JTReg hotspot and many JTReg
> JDK tests, M5 tier1 - tier5 tests, and JPRT.
> 
> Open Webrev: http://cr.openjdk.java.net/~hseigel/bug_8167372/webrev/index.html

This looks good.

It probably makes sense to assert that JNIHandle::resolve path that unpacks the naked oops also has
thread in proper state? This would expose failures like in JDK-8191227 [1] better.

Thanks,
-Aleksey

[1] https://bugs.openjdk.java.net/browse/JDK-8191227