Arguments:
This setf'able function
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.
This function returns t if arguments are
being saved, nil if they are not.
setf can be used with this function to set argument saving, so
(setf (argument-saving) t)
causes arguments to be saved and
(setf (argument-saving) nil)
causes them not to be saved.
The top-level command :args is roughly equivalent to this function.
Note that on some architectures, arguments are always saved. On those architectures, this command has no effect.
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.