Function Name from CALL_INSN RTX

[Iyer, Balaji V]

Hello Everyone,
       Is it possible to extract the function name (as a tree or char *)  from 
a CALL_INSN RTX? Is there a #define or a series of #defines that can accomplish 
this? 
       
       The tried to find this information by stepping through the print_rtx 
function using gdb and the information (as a char *) is currently stored in the 
following location of a CALL_INSN: 
"insn->u.fld[4]->rt_rtx->u.fld[1]->rt_rtx->u.fld[0]->rt_rtx->u.fld[0]->rt_rtx->u.fld[0]->rt_str
 "

      Does anyone know of a #define or a function I can call to retrieve this 
information? I would prefer to use functions or #defines rather than absolute 
locations for future compatibility.

Any help is greatly appreciated!

Thanks,

Balaji V. Iyer.