From: Kevin Buettner <kevinb@redhat.com>
To: Tom Tromey <tom@tromey.com>
Cc: gdb-patches@sourceware.org, Simon Marchi <simark@simark.ca>
Subject: Re: [PATCH 1/2] Fix PR 28308 - dprintf breakpoints not working when run from script
Date: Thu, 18 Nov 2021 11:34:52 -0700 [thread overview]
Message-ID: <20211118113452.5d26de4f@f35-m3> (raw)
In-Reply-To: <87pmqzetwz.fsf@tromey.com>
On Tue, 16 Nov 2021 13:18:20 -0700
Tom Tromey <tom@tromey.com> wrote:
> >>>>> "Kevin" == Kevin Buettner via Gdb-patches <gdb-patches@sourceware.org> writes:
>
> Kevin> Another way of implementing it would have been to associate three
> Kevin> commands with a dprintf breakpoint:
>
> Kevin> quiet
> Kevin> printf ... / call (void) printf (...) / agent-print ...
> Kevin> continue
>
> Kevin> This is basically what you'd use as a breakpoint command list if GDB
> Kevin> didn't have the dprintf facility. The virtue of this approach is that
> Kevin> it could use the existing breakpoint w/ associated command logic
> Kevin> without having to introduce some of the stuff that's only used by the
> Kevin> dprintf mechanism. This current bug either wouldn't have happened or,
> Kevin> if it did, would have affected the rest of the breakpoint/command
> Kevin> functionality as well.
>
> Kevin> I think it's probable that this approach (that I'm suggesting) was
> Kevin> considered but was found lacking in some way. If so, I'd guess that
> Kevin> either there's some major "gotcha" which I have considered or else
> Kevin> it's too slow.
>
> The problem with the above approach is that it interferes with other gdb
> commands. For example, if you step onto a dprintf spot, this may cause
> gdb to resume the inferior rather than stop. Or, if you 'next', and the
> code hits a dprintf, the resulting 'continue' will cause gdb to forget
> it is stepping.
I see. Thanks for the explanation.
Kevin
next prev parent reply other threads:[~2021-11-18 18:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-02 1:00 [PATCH 0/2] " Kevin Buettner
2021-10-02 1:00 ` [PATCH 1/2] " Kevin Buettner
2021-11-05 16:05 ` Simon Marchi
2021-11-10 3:34 ` Kevin Buettner
2021-11-16 20:18 ` Tom Tromey
2021-11-18 18:34 ` Kevin Buettner [this message]
2021-10-02 1:00 ` [PATCH 2/2] Test case for Bug 28308 Kevin Buettner
2021-11-05 16:21 ` Simon Marchi
2021-11-10 1:44 ` Kevin Buettner
2021-11-18 22:46 ` Kevin Buettner
2021-10-19 9:30 ` [PATCH 0/2] Fix PR 28308 - dprintf breakpoints not working when run from script Kevin Buettner
2021-11-02 19:09 ` Kevin Buettner
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