id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,lang,patch,platform
1477,[embed] expose non-vararg-based sub/method call-ins,plobsing,,"The embedding API currently exposes Parrot_ext_call to provide call-ins on subs and methods. Parrot_ext_call uses a va_list for parameters and return locations. This is fine only if the signature to the call can be determined statically. AFAIK, there is no portable way to build up a va_list at runtime.

Being a VM for dynamic languages, there are going to be cases where embedders want to decide things like number of arguments/returns at runtime (yay dynamicism!). A good example of this is &Parrot::Embed::invoke which can only make ""S->P"" calls ATM.

Providing an equivalent function that took an aggregate (either C-ish or Parrot-ish) instead of the va_list would allow for dynamic call-ins.",feature,closed,normal,,none,2.1.0,medium,wontfix,,jkeenan,,,