[15] RFR 8238574: Shenandoah: Assertion failure due to missing null check

[Aleksey Shipilev]

On 2/6/20 6:34 PM, Zhengyu Gu wrote:
> Please review this small change that adds a null check before calling 
> keep alive barrier to avoid assertion failure.
> 
> Native barrier may return null for a not null oop, if it is dead.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8238574
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8238574/webrev.00/
The patch looks good.

But I have a broader question: are all other paths that use the returned value from LRB-native safe?
E.g. calling from assembler/C1/C2?

Thanks,
-Aleksey