From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id 4754938515F3 for ; Fri, 3 Jun 2022 16:45:34 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 4754938515F3 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-296-XS8NRGP_P_Se2VkUulrH9w-1; Fri, 03 Jun 2022 12:45:32 -0400 X-MC-Unique: XS8NRGP_P_Se2VkUulrH9w-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7F25E858EEE; Fri, 3 Jun 2022 16:45:32 +0000 (UTC) Received: from tucnak.zalov.cz (unknown [10.39.192.11]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 3C2201410F36; Fri, 3 Jun 2022 16:45:32 +0000 (UTC) Received: from tucnak.zalov.cz (localhost [127.0.0.1]) by tucnak.zalov.cz (8.17.1/8.17.1) with ESMTPS id 253GjTUL2549447 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Fri, 3 Jun 2022 18:45:29 +0200 Received: (from jakub@localhost) by tucnak.zalov.cz (8.17.1/8.17.1/Submit) id 253GjSvT2549446; Fri, 3 Jun 2022 18:45:28 +0200 Date: Fri, 3 Jun 2022 18:45:28 +0200 From: Jakub Jelinek To: Miika Cc: "gcc@gcc.gnu.org" Subject: Re: [RFC] Support for nonzero attribute Message-ID: Reply-To: Jakub Jelinek References: MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 2.85 on 10.11.54.7 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Spam-Status: No, score=-3.9 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Jun 2022 16:45:35 -0000 On Fri, Jun 03, 2022 at 04:34:48PM +0000, Miika via Gcc wrote: > Hello, > > I would like to add support for new attribute: nonzero. > Nonzero attribute works the same way as nonnull but instead of checking for > NULL, it checks for integer or enum with value 0. NULL/nullptr is very special pointer (at it doesn't point to any object), while integer with value 0 is just one of many possible values. For some functions, 0 could be a value it wants to avoid, for others such value could be -1, negative value, positive, whatever else... IMHO if we want to add anything like this, it should be more generic, specify that a particular argument must have value in a specific range. Jakub