From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id E68CE3858CDB; Wed, 25 Oct 2023 13:40:31 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E68CE3858CDB
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1698241231;
	bh=XfAivKvwBlXpL2edsrvMI4U0buL7g0QN/xcDx4DKik8=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=p+1nFyKRZN/dtyykbRYD6TqmwiGawEE/ynfa6Rh9NT8HB32SXPrrQuJVWH8oecDb9
	 FPdYPf9hbcEsqsy2tUi7up4eJc0ObXAVYFQ8v+gZqCbUsGtrHSMoMhewhpiyqn7wjQ
	 lCK3eQKUpbWRnt7FxG7HCWCXLGZ++4n0yKu3Jeww=
From: "siddhesh at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/96503] attribute alloc_size effect lost after inlining
Date: Wed, 25 Oct 2023 13:40:31 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: ipa
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: diagnostic
X-Bugzilla-Severity: normal
X-Bugzilla-Who: siddhesh at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-96503-4-x1S0UfuoMF@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-96503-4@http.gcc.gnu.org/bugzilla/>
References: <bug-96503-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96503

--- Comment #8 from Siddhesh Poyarekar <siddhesh at gcc dot gnu.org> ---
(In reply to Martin Uecker from comment #7)
> For __builtin_with_access we probably only want to allow
> reducing the object size, while the 'extend_size' workaround=C2=A0
> used by systemd (cf comment #4) would need to extend it.=C2=A0
> Maybe we need another flag?

I've been thinking of a new __object_size__ attribute to annotate functions
that behave like __builtin_object_size so that calls to it override (and not
just reduce) sizes returned by allocations.  I can then use it to annotate a
supported malloc_usable_size replacement (say, malloc_size_estimate) that
actually works like __builtin_object_size and can then be used by systemd.=