undefined function hook

Hello !

I'm looking for the equivalent for ECL of the SBCL compiler function

    sb-c::ir1-convert
    
that transform a form to intemediary reresentation (level 1). Also the
equivalent if SBCL interpreter function 

    sb-int::simple-eval-in-lexenv

I want to plug in some code for the case of undefined functions and undefined free
variable.

Thanks you for your attention !