From: Alan Mackenzie <acm@muc.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: Build hangs in lisp/gnus.
Date: Sat, 4 Apr 2015 19:11:53 +0000 [thread overview]
Message-ID: <20150404191153.GF4362@acm.fritz.box> (raw)
In-Reply-To: <83lhi7omra.fsf@gnu.org>
Hello, Eli.
On Sat, Apr 04, 2015 at 07:56:41PM +0300, Eli Zaretskii wrote:
> > Date: Sat, 4 Apr 2015 16:42:15 +0000
> > Cc: emacs-devel@gnu.org
> > From: Alan Mackenzie <acm@muc.de>
> > > Type "finish" repeatedly s long as it displays the call-stack frames,
> > > then tell here which frame was the last you saw, before it stopped
> > > showing frames.
> > I typed "finish" just once, and the looping build process resumed with
> > the message:
> > Run till exit from #4 0x00000000005f5e5d in Ffuncall (nargs=3, args=0x7fff0f1dc3a8) at eval.c:2721
> > . Does that give any useful information?
> Yes, it now becomes important to understand what was that frame
> doing. Can you reproduce the same hang and backtrace at will? If so,
> after you attach GDB, and assuming the frame that calls Ffuncall is
> again frame #4, type these commands:
> (gdb) frame 4
> (gdb) p args[0]
> (gdb) xtype
> (gdb) p args[1]
> (gdb) xtype
> (gdb) p args[2]
> (gdb) xtype
> For each Lisp type that "xtype" reports, there's a corresponding
> command to display the Lisp object in human-readable form: "xsymbol"
> for a symbol, "xstring" for a string, "xvectorr" for a vector, etc.
> So after each "xtype" command invoke the corresponding command to
> display the object, and let's take it from there.
OK.
args[0] is a symbol, "macroexpand".
args[1] is a cons; xlist gives:
warning: Couldn't restore frame #3 in current thread. Bottom (innermost)
frame selected:
#0 0x000000000054f442 in make_lisp_symbol (sym=0x5f0714
<backtrace_next+36>) at lisp.h:1068
1068 Lisp_Object a = XIL (TAG_SYMOFFSET ((char *) sym - (char *)
lispsym));
$38 = 0xf7640
Lisp_Symbol
$39 = (struct Lisp_Symbol *) 0xd6baf0
"caddr"
---
$40 = 0xcba0
Lisp_Symbol
$41 = (struct Lisp_Symbol *) 0xc81050
"x"
---
nil
, which to me looks like the list "(caddr x)".
args[2] is a symbol, "nil".
This looks very promising. I have been messing around with "caddr",
etc., for a few weeks now, and it could well be that a change I've made
isn't as inconsequential as I thought. In particular, I don't really
understand the form "(declare (compiler-macro cl--compiler-macro-cXXr))"
near the start of the caddr function.
Thanks for all the help!
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2015-04-04 19:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-04 14:16 Build hangs in lisp/gnus Alan Mackenzie
2015-04-04 14:32 ` Eli Zaretskii
2015-04-04 15:35 ` Alan Mackenzie
2015-04-04 15:43 ` Eli Zaretskii
2015-04-04 16:42 ` Alan Mackenzie
2015-04-04 16:56 ` Eli Zaretskii
2015-04-04 19:11 ` Alan Mackenzie [this message]
2015-04-05 10:54 ` Alan Mackenzie
2015-04-05 17:22 ` Eli Zaretskii
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