RFR: 8237521: Memory Access API fixes for 32-bit

[David Holmes]

On 23/01/2020 5:08 pm, Nick Gasson wrote:
> Hi Maurizio,
> 
> Yes, for jdk/jdk. Do I need another Reviewer?

Yes - specifically you need a reviewer from Hotspot! cc'ing 
hotspot-runtime-dev :)

Cheers,
David

> 
> Thanks,
> Nick
> 
> 
> On 01/22/20 20:46 pm, Maurizio Cimadamore wrote:
>> Fixes look good to me - I assume this is for JDK 15, right?
>>
>> Maurizio
>>
>> On 22/01/2020 08:43, Nick Gasson wrote:
>>> Hi,
>>>
>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8237521
>>> Webrev: http://cr.openjdk.java.net/~ngasson/8237521/webrev.01/
>>>
>>> This is a follow-up to JDK-8236634 which just contained changes to the
>>> tests to make them build/pass on 32-bit systems for JDK 14. This patch
>>> removes the test workarounds and fixes two things to make them pass:
>>>
>>> * In Unsafe_AllocateMemory0 handle the case where the aligned-up size
>>> overflows a 32-bit size_t and throw an OutOfMemoryError instead of
>>> calling os::malloc(0).
>>>
>>> * Change the value of Utils.MAX_ALIGN from 16 to 8 on 32-bit systems,
>>> as malloc can return addresses that are only 8-byte aligned.
>>>
>>> Tested jdk_foreign on x86_32, arm32, aarch64, x86_64.
>>>
>>>
>>> Thanks,
>>> Nick
>