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xs_init(pTHX) { 
char *file = __FILE__; 
...
newXS("Filter::Util::Call::bootstrap",
       boot_Filter__Util__Call,file); 
}

PerlInterpreter *my_perl; 
#allocate memory for my_perl, construct my_perl, system initialization
+ 
... 
perl_parse(my_perl, xs_init, argc, args, loc_environ);