I think basically I want the following API, but ideally thread safe and
optimizable like a real LDC.
public final class LazyConstant {
private ConstantDesc desc;
private Object result;
public LazyConstant(ConstantDesc desc) {
this.desc = desc;
}
public Object resolve(MethodHandles.Lookup lookup) throws
ReflectiveOperationException {
if (null == result) {
result = desc.resolveConstantDesc(lookup);
}
return result;
}
}
On Thursday, April 30, 2020 at 6:57:19 PM UTC-7, Steven Stewart-Gallus
wrote:
>
> Hello,
>
> I've stumbled upon a puzzler while writing a compiler from System F
> embedded in Java to methodhandles.
>
> Given a DynamicConstantDesc how do I convert it to a MethodHandle that
> lazily loads the value alike ldc ?
> It seems absurd spin an entire class for this.
> I could create a MutableCallSite or perhaps a SwitchPoint for this but I
> don't really understand which would be better.
>
> A regularly old object that does lazy initialisation with a flag would
> probably be fine but I feel like I should be able to do better.
>
> I think I might be able to abuse the jit's handling of private finals in
> lambda objects to do this but I'm not quite certain that would work.
>
> Thanks
> Steven Stewart-Gallus
>
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