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 !