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Re: Certain numbers of special forms cause changing behaviour on functio


From: Andreas Schwab
Subject: Re: Certain numbers of special forms cause changing behaviour on function calls in --batch
Date: Sun, 10 Jul 2016 19:37:43 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.95 (gnu/linux)

Andreas Schwab <address@hidden> writes:

> Eli Zaretskii <address@hidden> writes:
>
>> That's what I see, thanks.  Very strange, this error from valgrind.
>> And we are none the wiser.
>
> --track-origins=yes gives more information.
>
> ==25255== Conditional jump or move depends on uninitialised value(s)
> ==25255==    at 0x5F597E: MARKERP (lisp.h:2614)
> ==25255==    by 0x5F597E: exec_byte_code (bytecode.c:1367)
> ==25255==    by 0x5B4582: Ffuncall (eval.c:2754)
> ==25255==    by 0x5F394C: exec_byte_code (bytecode.c:880)
> ==25255==    by 0x5B4582: Ffuncall (eval.c:2754)
> ==25255==    by 0x5F394C: exec_byte_code (bytecode.c:880)
> ==25255==    by 0x5B336C: apply_lambda (eval.c:2794)
> ==25255==    by 0x5B36B2: eval_sub (eval.c:2241)
> ==25255==    by 0x5B3EEC: Fprogn (eval.c:426)
> ==25255==    by 0x5B3BFC: eval_sub (eval.c:2119)
> ==25255==    by 0x5B3BFC: eval_sub (eval.c:2119)
> ==25255==    by 0x5B3EEC: Fprogn (eval.c:426)
> ==25255==    by 0x5AD694: Fsave_excursion (editfns.c:1014)
> ==25255==  Uninitialised value was created by a stack allocation
> ==25255==    at 0x57942A: Fvertical_motion (indent.c:1993)
>
> One of the local variables of Fvertical_motion isn't properly
> initialized.

This is executing this part from line-move-1:

243:18  constant  vertical-motion
244     constant  1
245     call      1
246     constant  0
247     eqlsign   

Thus it is actually it.vpos that is not initialized.

Andreas.

-- 
Andreas Schwab, address@hidden
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."



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