[9] RFR(L) 8166413: Integrate VM part of AOT changes

[Andrew Haley]

On 27/10/16 23:02, Christian Thalinger wrote:

> John and I discussed this before we decided to go with standard
> formats.  The biggest issue with the current CDS archive is that
> it’s not relocatable.  That means if the address you want to map at
> is not available you’re out of luck.

Is that really an issue in practice?

> So, the proprietary CDS format needs to become relocatable; pretty
> much make it a DSO.  And then you’re just reinventing the wheel.
> Also, every operating system had decades to tune loading and linking
> their format while you have to do it yourself.

They have, but what they have is still not so efficient: think about
GOTs, PLTs, etc.  These work, but we do better in JIT-generated code.
In other words, being as good as existing DSO formats is a very low
bar.

Andrew.