[RFC] Register sets

[Andrew Cagney]

> Daniel Jacobowitz <drow@mvista.com> writes:
> 
>> struct regset
>> {
>>   void (*supply_regset)(struct regcache *, const void *, size_t, int);
>>   void (*read_regset)(struct regcache *, void *, size_t, int);
>> };
> 
> 
> If you want to allow people to define regset formats via the CLI, it
> seems to me you probably want some kind of closure argument in there,
> like this:
> 
>     struct regset
>     {
>       /* Always pass this to the supply_regset and read_regset
>          functions below as their first argument.  */
>       void *closure;
>       void (*supply_regset)(void *closure,
>                             struct regcache *, const void *, size_t, int);
>       void (*read_regset)(void *closure,
>                           struct regcache *, void *, size_t, int);
>     };
> 
> This gives you the hook you need to have a single function for all
> CLI-defined regsets, interpreting the layout the user supplies to the
> CLI command.

Er, this isn't a closure (at least not in the sense specified on bfd@). 
  Rather this is an object and so might as well be implemented in more 
of an object style - pass the "struct regset" as the first parameter.

enjoy,
Andrew