Condy for LambdaMetafactory?

[Brian Goetz]

There was an experiment to translate non-capturing lambdas with condy, 
which was never integrated.  As you observed, it requires changes to the 
bootstrap method signature; when we started adding the alternate 
bootstrap method, we realized there were some cleanups in the LMF 
spec/implementation we wanted to do, but these ended up getting 
back-burnered.

On 10/20/2023 4:10 PM, Luke Sandberg wrote:
> Hi, as part of a custom compiler I am working on I stumbled across 
> https://bugs.openjdk.org/browse/JDK-8198418 which references invoking 
> LambdaMetafactory.metafactory from a condy instruction when there are 
> no bound parameters.
>
> I see that there is support for this in BootstrapMethodInvoker: 
> https://github.com/openjdk/jdk/blob/77b2394c46bd304ffc0658cb758d971f1f2940b6/src/java.base/share/classes/java/lang/invoke/BootstrapMethodInvoker.java#L136C28-L136C55
>
> But there is no method implementing this signature that i can find.
>
> Is this a half implemented idea from the original condy 
> implementation? Or am I missing something?  Initially i thought that 
> BootstrapMethodInvoker might handle the signature delta, but 
> experimentally that is not true :D
>
> Thanks,
> -Luke
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