Status of Anno Class loader with constant patches?

[Rémi Forax]

On 12/28/2010 07:32 PM, Mark Roos wrote:
> Thanks Remi,  the extra comments really helped
>
> You also mentioned
> >
> > There is another way to do something similar,
> > you can call invokedynamic, use the bootstrap arguments to send
> > the primitive values composing the object value and when the
> > BSM is called returns a ConstantCallSite with as target a method handle
> > created by MethodHandles.constant().
>
> At first glance this seems like adding a lot of overhead ( a method 
> send ) as
> a replacement for a simple ldc bytecode.  Are you thinking that 
> hotspot will be
> efficient in optimizing this?

We, the JSR292 EG, think that most of the VMs will be able to optimize this.

>
> I like it theoretically, as I don't have to mess with the class 
> loader, but will
> the overhead be acceptable?

In fact for hotspot, this kind of constant can be even more optimized
than a static final field containing a non-primitive values which is not 
a real constant
(it can be modified by reflection).

>
> happy new year
> mark roos

Rémi
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