ObjectVector

[forax at univ-mlv.fr]

> From: "Chen Liang" <chen.l.liang at oracle.com>
> To: "Remi Forax" <forax at univ-mlv.fr>, "panama-dev" <panama-dev at openjdk.org>
> Sent: Thursday, May 8, 2025 5:37:14 PM
> Subject: Re: ObjectVector

> Hi Remi, where do you plan to use such a vector? Reading from an array of
> references?

yes, read/write, 
as an example, if we have something like ObjectVector, ArrayList.contains(null) can be implemented by reading the array of elements into a vector register and then use eq(null) to get a VectorMask. 

> Regards, Chen

regards, 
Rémi 

> From: panama-dev <panama-dev-retn at openjdk.org> on behalf of Remi Forax
> <forax at univ-mlv.fr>
> Sent: Thursday, May 8, 2025 10:31 AM
> To: panama-dev at openjdk.org <panama-dev at openjdk.org>
> Subject: ObjectVector
> Hello,
> in java, unlike in C, references are opaque so a lot of operations on the value
> of the reference are not allowed,
> but some still exist like checking if the value is null or not.

> Is there a way to create an ObjectVector that would only implement those simple
> operations ?

> Or is it a stupid idea given that both ZGC and shenandoah use read-barrier ?

> regards,
> Rémi
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