* About `disassemble'
@ 2013-02-04 2:22 Xue Fuqiao
0 siblings, 0 replies; 4+ messages in thread
From: Xue Fuqiao @ 2013-02-04 2:22 UTC (permalink / raw)
To: help-gnu-emacs
I have a question about `disassemble' in Emacs Lisp:
(defun silly-loop (n)
"Return time before and after N iterations of a loop."
(let ((t1 (current-time-string)))
(while (> (setq n (1- n))
0))
(list t1 (current-time-string))))
=> silly-loop
(disassemble 'silly-loop)
=>
byte code for silly-loop:
doc: Return time before and after N iterations of a loop.
args: (n)
0 constant current-time-string
1 call 0
2 varbind t1
3:1 varref n
4 sub1
5 dup
6 varset n
7 constant 0
8 gtr
9 goto-if-not-nil 1
12 varref t1
13 constant current-time-string
14 call 0
15 unbind 1
16 list2
17 return
What does the number at the left side mean (i.e. 0, 1, 2, 3:1, ... ,
17)? It isn't explained in the Emacs Lisp manual. Can anybody help?
Thanks.
--
Best regards, Xue Fuqiao.
http://www.emacswiki.org/emacs/XueFuqiao
^ permalink raw reply [flat|nested] 4+ messages in thread[parent not found: <mailman.18959.1359944577.855.help-gnu-emacs@gnu.org>]
[parent not found: <mailman.1076648.1359949809.854.help-gnu-emacs@gnu.org>]
* Re: About `disassemble'
[not found] <mailman.1076648.1359949809.854.help-gnu-emacs@gnu.org>
@ 2013-02-05 0:06 ` Xue Fuqiao
2013-02-05 4:13 ` Stefan Monnier
0 siblings, 1 reply; 4+ messages in thread
From: Xue Fuqiao @ 2013-02-05 0:06 UTC (permalink / raw)
To: help-gnu-emacs; +Cc: Stefan Monnier
Stefan Monnier wrote:
> > What does the number at the left side mean (i.e. 0, 1, 2, 3:1, ... ,
> > 17)?
>
> It's the (byte) position of the code in the byte-code.
I still don't understand. Can you explain it more detailed? For example, "3:1" is confusing.
> Stefan
--
Best regards, Xue Fuqiao.
http://www.emacswiki.org/emacs/XueFuqiao
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: About `disassemble'
2013-02-05 0:06 ` Xue Fuqiao
@ 2013-02-05 4:13 ` Stefan Monnier
0 siblings, 0 replies; 4+ messages in thread
From: Stefan Monnier @ 2013-02-05 4:13 UTC (permalink / raw)
To: help-gnu-emacs
>> > What does the number at the left side mean (i.e. 0, 1, 2, 3:1, ... ,
>> > 17)?
>> It's the (byte) position of the code in the byte-code.
> I still don't understand. Can you explain it more detailed?
> For example, "3:1" is confusing.
"3:1" is "byte number 3, label number 1". So "goto 1" will jump to byte 3.
Stefan
^ permalink raw reply [flat|nested] 4+ messages in thread
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2013-02-04 2:22 About `disassemble' Xue Fuqiao
[not found] <mailman.18959.1359944577.855.help-gnu-emacs@gnu.org>
2013-02-04 3:46 ` Stefan Monnier
[not found] <mailman.1076648.1359949809.854.help-gnu-emacs@gnu.org>
2013-02-05 0:06 ` Xue Fuqiao
2013-02-05 4:13 ` Stefan Monnier
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