[Ecls-list] "Problem" with overloading functions from compiled file

Goffioul Michael goffioul at imec.be
Thu Sep 7 08:59:50 UTC 2006

[Of course, I forgot to write the part about that "problem" in my
previous mail]

When I wanted to implement my own REPL loop and wanted to overload some
the functions defined in top.lsp. However I discovered a problem with no
workaround. In a compiled file, functions that call each other do it by
calling directly the equivalent C function. As the call is "hard-coded",
can't overload it.

For example:

(defun f1 (x)
  ;; do something

(defun f2 (y)
  (let ((z (f1 y)))
    ;; do something

If you put those 2 functions in the same file and compile it, the C code
for F2
will call the C function for F1. Later on, if you want to redefine F1
with some
other implementation, the function F2 won't use it because it calls the
C function
directly, and not "the function associated with the symbol F1". So, in
the end,
you also have to redefine F2, even if the implementation is the same.

I don't say it's bad, indeed it's speed up code execution. But sometimes
it might
be a limiting factor.


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