[14] RFR(T) 8230730: UseCompressedOops test crash with assertion failure

[Stefan Karlsson]

Looks good.

Thanks,
StefanK

On 2019-09-07 04:45, Zhengyu Gu wrote:
> JDK-8224815 changed the assertion from:
>
> assert((intptr_t)base() <= (intptr_t)(Universe::heap()->base() - 
> os::vm_page_size()) || base() == NULL, "invalid value");
>
> to
>
> assert((intptr_t)base() <= (intptr_t)(_heap_address_range.start() - 
> os::vm_page_size()) || base() == NULL, "invalid value");
>
> while Universe::heap()->base() returns "address" type, 
> _heap_address_range.start() returns "HeapWord*" type, therefore, new 
> assertion subtracts vm_page_size * sizeof(HeapWord*) from base 
> address, that triggers assertion failure.
>
> This bug is only exposed when JVM can not obtain zero-based heap.
>
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8230730
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8230730/webrev.00/
>
> Test:
>   hotspot_gc (fastdebug) on Linux x86_64 and aarch64.
>   Submit test in progress.
>
> Thanks,
>
> -Zhengyu