Re: gcj uses reflection for every INVOKEINTERFACE?

[Bryce McKinlay <bryce at mckinlay dot net dot nz>]

On Feb 26, 2004, at 6:26 PM, Adam Megacz wrote:

> Hrm, I found this at the bottom of build_invokeinterface():
>
>   return build (CALL_EXPR, ptr_type_node,
>                 build_address_of (soft_lookupinterfacemethod_node),
>                 lookup_arg, NULL_TREE);
>
> It looks like _Jv_LookupInterfaceMethodIdx() is getting called every
> time a method overriding an interface method is invoked... is this
> true?

Yes, but _Jv_LookupInterfaceMethodIdx doesn't actually use reflection, 
but rather the "constant time" interface dispatch dispatch tables - so 
the actual lookup is very efficient.

>  Is there any way around this?

It would be possible to inline the itable lookup, thus avoiding the 
call to _Jv_LookupInterfaceMethodIdx. I expect that would give a 
moderate performance gain, but also possibly increase code size. It 
would be an interesting experiment.

Regards

Bryce