[9] RFR(S): 8155643: Java crash with assert in Xcomp mode and disabled ReduceInitialCardMarks

[Vladimir Kozlov]

Looks good.

Thanks,
Vladimir

On 5/10/16 9:01 AM, Tobias Hartmann wrote:
> Hi,
>
> please review the following patch:
>
> https://bugs.openjdk.java.net/browse/JDK-8155643
> http://cr.openjdk.java.net/~thartmann/8155643/webrev.00/
>
> We hit the "should have klasses" assert in PhaseMacroExpand::generate_arraycopy() while intrinsifying Object[].clone() because the src and dst klass is not set. This is because if ReduceInitialCardMarks is disabled, we emit a copy of type 'CloneOop' instead of a 'CloneBasic'. In both cases we should not emit a subtype check.
>
> Tested on JPRT and RBT (running).
>
> Thanks,
> Tobias
>