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Asked: May 10, 20262026-05-10T22:12:29+00:00 2026-05-10T22:12:29+00:00

With common lisp and I am assuming the introspection properties. How can I add

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With common lisp and I am assuming the introspection properties. How can I add code to common lisp code that will tell me when a function is called and when has finished executing. I want to take any lisp code and this particular modification to the code. I figure with lisp’s AST analysis, this should be possible.

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  1. 2026-05-10T22:12:29+00:00Added an answer on May 10, 2026 at 10:12 pm

    You can use (trace function) for a simple mechanism. For something more involved, here is a good discussion from comp.lang.lisp.

    [CL_USER]> (defun fac (n)     'Naïve factorial implementation'     (if (< 1 n)         (* n (fac (- n 1)))         1)) FAC [CL_USER]> (trace fac) ;; Tracing function FAC. (FAC) [CL_USER]> (fac 5) 1. Trace: (FAC '5) 2. Trace: (FAC '4) 3. Trace: (FAC '3) 4. Trace: (FAC '2) 5. Trace: (FAC '1) 5. Trace: FAC ==> 1 4. Trace: FAC ==> 2 3. Trace: FAC ==> 6 2. Trace: FAC ==> 24 1. Trace: FAC ==> 120 120 [CL_USER]>  
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