[Help-smalltalk] Re: C Callbacks

[Paolo Bonzini]

Paolo Bonzini wrote:
> > Maybe I can reuse the existing parameter stuff around #cCall: for 
> > inbound calls.
>
> If you want to warm up with that code, you might start converting this 
> part of it to Smalltalk:
>
>   desc->returnType = classify_type_symbol (returnTypeOOP, true);
>   if (desc->returnType == _gst_nil_oop)
>     goto error;
>
>   for (i = 1; i <= numArgs; i++)
>     {
>       OOP type;
>       type = desc->argTypes[i - 1] =
>         classify_type_symbol (ARRAY_AT (argsOOP, i), false);
>       if (type == _gst_nil_oop)
>         goto error;
>     }
>
> ... together with symbol_type_map, type_map, classify_type_symbol.

Actually, what I meant is that this code is duplicated in C and 
Smalltalk (kernel/CFuncs.st).  It would be interesting to use only the 
Smalltalk one.  To this end, the C primitive VMpr_CFuncDescriptor_create 
(defined in prims.def and cint.c) should be simplified to just return 
the address of a C function.  Everything else can be done in Smalltalk.

Paolo