From: Tom Tromey <tom@tromey.com>
To: Andreas Arnez <arnez@linux.vnet.ibm.com>
Cc: Tom Tromey <tom@tromey.com>, gdb-patches@sourceware.org
Subject: Re: [PATCH] Allow DW_OP_GNU_uninit in dwarf_expr_require_composition
Date: Mon, 10 Oct 2016 22:41:00 -0000 [thread overview]
Message-ID: <874m4jq13d.fsf@tromey.com> (raw)
In-Reply-To: <m3a8ece6iw.fsf@oc1027705133.ibm.com> (Andreas Arnez's message of "Mon, 10 Oct 2016 14:24:23 +0200")
>>>>> "Andreas" == Andreas Arnez <arnez@linux.vnet.ibm.com> writes:
Andreas> You mean to allow DW_OP_GNU_uninit to terminate any simple
Andreas> location description?
Yes.
>> That is, assuming DW_OP_GNU_uninit is useful at all.
>> Another option would be to deprecate it.
Andreas> Right, I wonder about its usefulness as well. For a variable
Andreas> with fixed location it may cover a small window where the
Andreas> compiler can be certain that the variable is uninitialized. I
Andreas> guess this *might* be useful sometimes?
Andreas> Is there even a DWARF issue for this? Or a formal
Andreas> specification?
I don't think so. Last time I looked into this all I was able to find
were the patch submissions to gcc and gdb. IIRC they weren't all that
informative though.
Tom
prev parent reply other threads:[~2016-10-10 22:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-27 17:38 Andreas Arnez
2016-10-04 17:33 ` Pedro Alves
2016-10-05 10:42 ` Andreas Arnez
2016-10-09 17:36 ` Tom Tromey
2016-10-10 12:24 ` Andreas Arnez
2016-10-10 22:41 ` Tom Tromey [this message]
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