From: Kevin Buettner <kevinb@redhat.com>
To: Andrew Cagney <ac131313@cygnus.com>, gdb@sources.redhat.com
Subject: Re: [rfc] Frame based register cache / frame->unwind
Date: Tue, 16 Apr 2002 09:14:00 -0000 [thread overview]
Message-ID: <1020416161406.ZM30806@localhost.localdomain> (raw)
In-Reply-To: Andrew Cagney <ac131313@cygnus.com> "[rfc] Frame based register cache / frame->unwind" (Apr 14, 4:58pm)
On Apr 14, 4:58pm, Andrew Cagney wrote:
> I'm not too worried about the apparent 2% overhead per frame create
> though. With the patch applied, the code ends up maintaining both this
> new cache and the old ->saved_regs table. Rewriting a target to just
> use the ->unwind_cache, should, I think, claw back the 2% and then some
> - less need to go out to the target.
I'm puzzled. Assuming you don't have dwarf2cfi or the like, how do you
avoid maintaining the old ->saved_regs table?
Hmm... I see that the unwind cache has an ``addr'' field. Does that
mean that that the prologue analysis function calls
frame_supply_unwound_register() to set this field?
What is the ``optimized'' flag (in the frame cache) used for?
Kevin
next prev parent reply other threads:[~2002-04-16 16:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-14 13:58 Andrew Cagney
2002-04-14 18:48 ` Daniel Jacobowitz
2002-04-16 8:10 ` Andrew Cagney
2002-04-16 9:14 ` Kevin Buettner [this message]
2002-04-16 10:08 ` Andrew Cagney
2002-04-17 10:04 ` Andrew Cagney
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