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Common Lisp implementation running on the JVM
There is a newer version: 1.9.2
;;; disassemble.lisp
;;;
;;; Copyright (C) 2005 Peter Graves
;;; $Id$
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License
;;; as published by the Free Software Foundation; either version 2
;;; of the License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
;;;
;;; As a special exception, the copyright holders of this library give you
;;; permission to link this library with independent modules to produce an
;;; executable, regardless of the license terms of these independent
;;; modules, and to copy and distribute the resulting executable under
;;; terms of your choice, provided that you also meet, for each linked
;;; independent module, the terms and conditions of the license of that
;;; module.  An independent module is a module which is not derived from
;;; or based on this library.  If you modify this library, you may extend
;;; this exception to your version of the library, but you are not
;;; obligated to do so.  If you do not wish to do so, delete this
;;; exception statement from your version.

(in-package #:system)

(require '#:clos)

(defun disassemble (arg)
  (require-type arg '(OR FUNCTION
                      SYMBOL
                      (CONS (EQL SETF) (CONS SYMBOL NULL))
                      (CONS (EQL LAMBDA) LIST)))
  (let ((function (cond ((functionp arg)
                         arg)
                        ((symbolp arg)
                         (or (macro-function arg) (symbol-function arg))))))
    (when (typep function 'generic-function)
      (setf function (mop::funcallable-instance-function function)))
    (when (functionp function)
      (unless (compiled-function-p function)
        (setf function (compile nil function)))
      (let ((class-bytes (function-class-bytes function)))
	(when class-bytes
	  (with-input-from-string
	      (stream (disassemble-class-bytes class-bytes))
	    (loop
	       (let ((line (read-line stream nil)))
		 (unless line (return))
		 (write-string "; ")
		 (write-string line)
		 (terpri))))
	  (return-from disassemble)))
      (%format t "; Disassembly is not available.~%"))))