mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-27 07:37:33 +00:00
262 lines
8.6 KiB
EmacsLisp
262 lines
8.6 KiB
EmacsLisp
;;; disass.el --- disassembler for compiled Emacs Lisp code
|
|
|
|
;;; Copyright (C) 1986, 1991 Free Software Foundation, Inc.
|
|
|
|
;; Author: Doug Cutting <doug@csli.stanford.edu>
|
|
;; Jamie Zawinski <jwz@lucid.com>
|
|
;; Maintainer: Jamie Zawinski <jwz@lucid.com>
|
|
;; Keywords: internal
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; GNU Emacs 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, or (at your option)
|
|
;; any later version.
|
|
|
|
;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
|
|
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
;;; Commentary:
|
|
|
|
;; The single entry point, `disassemble', disassembles a code object generated
|
|
;; by the Emacs Lisp byte-compiler. This doesn't invert the compilation
|
|
;; operation, not by a long shot, but it's useful for debugging.
|
|
|
|
;;
|
|
;; Original version by Doug Cutting (doug@csli.stanford.edu)
|
|
;; Substantially modified by Jamie Zawinski <jwz@lucid.com> for
|
|
;; the new lapcode-based byte compiler.
|
|
|
|
;;; Code:
|
|
|
|
;;; The variable byte-code-vector is defined by the new bytecomp.el.
|
|
;;; The function byte-decompile-lapcode is defined in byte-opt.el.
|
|
;;; Since we don't use byte-decompile-lapcode, let's try not loading byte-opt.
|
|
(require 'byte-compile "bytecomp")
|
|
|
|
(defvar disassemble-column-1-indent 8 "*")
|
|
(defvar disassemble-column-2-indent 10 "*")
|
|
|
|
(defvar disassemble-recursive-indent 3 "*")
|
|
|
|
;;;###autoload
|
|
(defun disassemble (object &optional buffer indent interactive-p)
|
|
"Print disassembled code for OBJECT in (optional) BUFFER.
|
|
OBJECT can be a symbol defined as a function, or a function itself
|
|
\(a lambda expression or a compiled-function object).
|
|
If OBJECT is not already compiled, we compile it, but do not
|
|
redefine OBJECT if it is a symbol."
|
|
(interactive (list (intern (completing-read "Disassemble function: "
|
|
obarray 'fboundp t))
|
|
nil 0 t))
|
|
(if (eq (car-safe object) 'byte-code)
|
|
(setq object (list 'lambda () object)))
|
|
(or indent (setq indent 0)) ;Default indent to zero
|
|
(save-excursion
|
|
(if (or interactive-p (null buffer))
|
|
(with-output-to-temp-buffer "*Disassemble*"
|
|
(set-buffer "*Disassemble*")
|
|
(disassemble-internal object indent (not interactive-p)))
|
|
(set-buffer buffer)
|
|
(disassemble-internal object indent nil)))
|
|
nil)
|
|
|
|
|
|
(defun disassemble-internal (obj indent interactive-p)
|
|
(let ((macro 'nil)
|
|
(name 'nil)
|
|
(doc 'nil)
|
|
args)
|
|
(while (symbolp obj)
|
|
(setq name obj
|
|
obj (symbol-function obj)))
|
|
(if (subrp obj)
|
|
(error "Can't disassemble #<subr %s>" name))
|
|
(if (and (listp obj) (eq (car obj) 'autoload))
|
|
(progn
|
|
(load (nth 1 obj))
|
|
(setq obj (symbol-function name))))
|
|
(if (eq (car-safe obj) 'macro) ;handle macros
|
|
(setq macro t
|
|
obj (cdr obj)))
|
|
(if (and (listp obj) (eq (car obj) 'byte-code))
|
|
(setq obj (list 'lambda nil obj)))
|
|
(if (and (listp obj) (not (eq (car obj) 'lambda)))
|
|
(error "not a function"))
|
|
(if (consp obj)
|
|
(if (assq 'byte-code obj)
|
|
nil
|
|
(if interactive-p (message (if name
|
|
"Compiling %s's definition..."
|
|
"Compiling definition...")
|
|
name))
|
|
(setq obj (byte-compile obj))
|
|
(if interactive-p (message "Done compiling. Disassembling..."))))
|
|
(cond ((consp obj)
|
|
(setq obj (cdr obj)) ;throw lambda away
|
|
(setq args (car obj)) ;save arg list
|
|
(setq obj (cdr obj)))
|
|
(t
|
|
(setq args (aref obj 0))))
|
|
(if (zerop indent) ; not a nested function
|
|
(progn
|
|
(indent-to indent)
|
|
(insert (format "byte code%s%s%s:\n"
|
|
(if (or macro name) " for" "")
|
|
(if macro " macro" "")
|
|
(if name (format " %s" name) "")))))
|
|
(let ((doc (if (consp obj)
|
|
(and (stringp (car obj)) (car obj))
|
|
(and (> (length obj) 4) (aref obj 4)))))
|
|
(if (and doc (stringp doc))
|
|
(progn (and (consp obj) (setq obj (cdr obj)))
|
|
(indent-to indent)
|
|
(princ " doc: " (current-buffer))
|
|
(if (string-match "\n" doc)
|
|
(setq doc (concat (substring doc 0 (match-beginning 0))
|
|
" ...")))
|
|
(insert doc "\n"))))
|
|
(indent-to indent)
|
|
(insert " args: ")
|
|
(prin1 args (current-buffer))
|
|
(insert "\n")
|
|
(let ((interactive (cond ((consp obj)
|
|
(assq 'interactive obj))
|
|
((> (length obj) 5)
|
|
(list 'interactive (aref obj 5))))))
|
|
(if interactive
|
|
(progn
|
|
(setq interactive (nth 1 interactive))
|
|
(if (eq (car-safe (car-safe obj)) 'interactive)
|
|
(setq obj (cdr obj)))
|
|
(indent-to indent)
|
|
(insert " interactive: ")
|
|
(if (eq (car-safe interactive) 'byte-code)
|
|
(progn
|
|
(insert "\n")
|
|
(disassemble-1 interactive
|
|
(+ indent disassemble-recursive-indent)))
|
|
(let ((print-escape-newlines t))
|
|
(prin1 interactive (current-buffer))))
|
|
(insert "\n"))))
|
|
(cond ((and (consp obj) (assq 'byte-code obj))
|
|
(disassemble-1 (assq 'byte-code obj) indent))
|
|
((byte-code-function-p obj)
|
|
(disassemble-1 obj indent))
|
|
(t
|
|
(insert "Uncompiled body: ")
|
|
(let ((print-escape-newlines t))
|
|
(prin1 (if (cdr obj) (cons 'progn obj) (car obj))
|
|
(current-buffer))))))
|
|
(if interactive-p
|
|
(message "")))
|
|
|
|
|
|
(defun disassemble-1 (obj indent)
|
|
"Prints the byte-code call OBJ in the current buffer.
|
|
OBJ should be a call to BYTE-CODE generated by the byte compiler."
|
|
(let (bytes constvec)
|
|
(if (consp obj)
|
|
(setq bytes (car (cdr obj)) ;the byte code
|
|
constvec (car (cdr (cdr obj)))) ;constant vector
|
|
(setq bytes (aref obj 1)
|
|
constvec (aref obj 2)))
|
|
(let ((lap (byte-decompile-bytecode bytes constvec))
|
|
op arg opname pc-value)
|
|
(let ((tagno 0)
|
|
tmp
|
|
(lap lap))
|
|
(while (setq tmp (assq 'TAG lap))
|
|
(setcar (cdr tmp) (setq tagno (1+ tagno)))
|
|
(setq lap (cdr (memq tmp lap)))))
|
|
(while lap
|
|
;; Take off the pc value of the next thing
|
|
;; and put it in pc-value.
|
|
(setq pc-value nil)
|
|
(if (numberp (car lap))
|
|
(setq pc-value (car lap)
|
|
lap (cdr lap)))
|
|
;; Fetch the next op and its arg.
|
|
(setq op (car (car lap))
|
|
arg (cdr (car lap)))
|
|
(setq lap (cdr lap))
|
|
(indent-to indent)
|
|
(if (eq 'TAG op)
|
|
(progn
|
|
;; We have a label. Display it, but first its pc value.
|
|
(if pc-value
|
|
(insert (format "%d:" pc-value)))
|
|
(insert (int-to-string (car arg))))
|
|
;; We have an instruction. Display its pc value first.
|
|
(if pc-value
|
|
(insert (format "%d" pc-value)))
|
|
(indent-to (+ indent disassemble-column-1-indent))
|
|
(if (and op
|
|
(string-match "^byte-" (setq opname (symbol-name op))))
|
|
(setq opname (substring opname 5))
|
|
(setq opname "<not-an-opcode>"))
|
|
(if (eq op 'byte-constant2)
|
|
(insert " #### shouldn't have seen constant2 here!\n "))
|
|
(insert opname)
|
|
(indent-to (+ indent disassemble-column-1-indent
|
|
disassemble-column-2-indent
|
|
-1))
|
|
(insert " ")
|
|
(cond ((memq op byte-goto-ops)
|
|
(insert (int-to-string (nth 1 arg))))
|
|
((memq op '(byte-call byte-unbind
|
|
byte-listN byte-concatN byte-insertN))
|
|
(insert (int-to-string arg)))
|
|
((memq op '(byte-varref byte-varset byte-varbind))
|
|
(prin1 (car arg) (current-buffer)))
|
|
((memq op '(byte-constant byte-constant2))
|
|
;; it's a constant
|
|
(setq arg (car arg))
|
|
;; but if the value of the constant is compiled code, then
|
|
;; recursively disassemble it.
|
|
(cond ((or (byte-code-function-p arg)
|
|
(and (eq (car-safe arg) 'lambda)
|
|
(assq 'byte-code arg))
|
|
(and (eq (car-safe arg) 'macro)
|
|
(or (byte-code-function-p (cdr arg))
|
|
(and (eq (car-safe (cdr arg)) 'lambda)
|
|
(assq 'byte-code (cdr arg))))))
|
|
(cond ((byte-code-function-p arg)
|
|
(insert "<compiled-function>\n"))
|
|
((eq (car-safe arg) 'lambda)
|
|
(insert "<compiled lambda>"))
|
|
(t (insert "<compiled macro>\n")))
|
|
(disassemble-internal
|
|
arg
|
|
(+ indent disassemble-recursive-indent 1)
|
|
nil))
|
|
((eq (car-safe arg) 'byte-code)
|
|
(insert "<byte code>\n")
|
|
(disassemble-1 ;recurse on byte-code object
|
|
arg
|
|
(+ indent disassemble-recursive-indent)))
|
|
((eq (car-safe (car-safe arg)) 'byte-code)
|
|
(insert "(<byte code>...)\n")
|
|
(mapcar ;recurse on list of byte-code objects
|
|
'(lambda (obj)
|
|
(disassemble-1
|
|
obj
|
|
(+ indent disassemble-recursive-indent)))
|
|
arg))
|
|
(t
|
|
;; really just a constant
|
|
(let ((print-escape-newlines t))
|
|
(prin1 arg (current-buffer))))))
|
|
)
|
|
(insert "\n")))))
|
|
nil)
|
|
|
|
;;; disass.el ends here
|