Trying to work newer indy into JRuby

[Charles Oliver Nutter]

I've read through Fidgety a few times and I think I'm starting to get it.

So the idea is that you would install a MethodHandle into the call site 
that knows how to handle the incoming objects and (potentially) re-patch 
the call site with a new method?

Is there any guarantee that the code in the MethodHandle will be inlined 
through? I may have missed some discussion on this, but I want to be 
absolutely clear on this point. If I wire up things exactly as in 
Fidgety's "Guard" method handle, will (e.g.) Hotspot inline all the way 
through? What are the edge cases?

I may have enough to get this wired now...starting to see where the old 
pieces fit into the new structure. Hints still welcome :)

- Charlie

Charles Oliver Nutter wrote:
> Ok, I've been puzzling over the demos for a few hours, and I'm confused.
> 
> With the iteration from this fall, where the full set of args were 
> available during the bootstrap, I was able to actually inspect the 
> receiver object and get information from it. Now I don't see how I can 
> do that.
> 
> Imagine this case:
> 
> * All objects are of type RubyObject
> * The method table is just a hash contained within RubyObject#getMetaClass
> 
> When doing a dynamic call against one of those objects, there's now no 
> way for me to call getMetaClass on the receiver object to get its method 
> table, and no way for me to look up a named method in that table.
> 
> I'll keep hunting, but if someone has a hint I'd appreciate it.
> 
> What I need is essentially this:
> 
> ... bootstrapDynamic(Object receiver, Class caller, String name, 
> MethodType type) {
>    MethodHandle handle = 
> ((RubyClass)receiver).getMetaClass().findMethodHandle(name, type);
>    CallSite callSite = new CallSite(caller, name, type);
>    callSite.setTarget(handle);
>    return callSite;
> }
> 
> I just don't see how I can get access to *my* method tables from within 
> the bootstrap now, since they don't live on a Class or in a global 
> location anywhere. And how would I bootstrap an interpreted method?
> 
> - Charlie
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