Arguments: &key save
This command controls whether Lisp saves arguments passed to Lisp
functions which happen to be stored in registers rather than on the
stack. Passing some arguments in registers is very efficient and is
done when possible. However, the values in those registers will be
overwritten when an unhandled error occurs and thus not be available
for debugging. If argument saving is enabled, the argument values in
registers will be saved and available for debugging. If argument
saving is disabled, those argument values will not be saved. Unsaved
arguments show up as :unknown in stack backtraces (as
printed by :zoom).
Note: if arguments are being saved, code may not run as fast as possible.
Called with save unspecified, reports the
current status is printed, as (:save t) if arguments are
being saved, (:save nil) if they are not.
Called with save specified t or nil, argument saving
will start or stop, respectively.
The setf'able function
argument-saving is the
functional equivalent of this command. It takes no argument and
returns t or nil as
arguments are or are not saved.
Note that on some architectures (in 5.0/5.0.1 at the time of writing, only the Sparc), arguments are always saved. On those architectures, this command has no effect.
See top-level.htm for more information on top-level commands.
The documentation is described in introduction.htm and the index is in index.htm.
Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.
Created 2000.10.5.