[Gcl-devel] Advice on error handling

[Camm Maguire]

Greetings!  Am looking for some general advice.

Consider the most pathological case, where the user redefines some
system function that is inescapable in the top level loop:

(trace format)
or
(defun read (&rest r) nil)

As far as I can tell, there is no way to construct a generalized
'heap-undo' operation, so perhaps what we want here is 1) some
emergency immutable code to process one command, or 2) and endless
error loop (without abort) in the error handler (i.e. we don't wish to
handle this case within lisp), 3) make these functions immutable 4)
capture the original definitions in lexical gensyms, and reset on
unrecoverable error.

Advice?

Take care,
-- 
Camm Maguire                                            address@hidden
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