From nobody Wed Oct 23 00:27:46 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1729528646; cv=none; d=zohomail.com; s=zohoarc; b=CVUnLZ7+tNeOrkN8qLBdVxzvKG/Q4DM9mY23ibOdOnEgLDwuzXly3ztEp7/vs14UbjHzGapbIiE+n8EsxHJj/iUiuk7fCjnS8zkQro1kLw65Dv4HM3Wq9likHVlxivgXBxMNqWPmdNPZpEzQwmqdD1Sl2UR+MSQSy1ukaBZiJ04= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1729528646; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=Qr5dagb8vQ3bDNxUa7EXxPicbCEKo86t7f8oVBzNrBQ=; b=DU4yDTuptYxsfIUNX7VPHEKPRaiYgDG4v9e51CjFUUyBD2ynXJDN9t/Kez8bnX+GJJ7mLc8Vu8PvZ/ScOfBRrSn+z7N6I56JJaWwZz4M5ljngI7+BRZgiiPTioLa95+dUpUMoU5hoLHbVEoAo9WdN0hhrxhQ+0RXVXLpGMA/TYg= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1729528646178573.6938892588273; Mon, 21 Oct 2024 09:37:26 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t2vOz-0006nf-KE; Mon, 21 Oct 2024 12:37:05 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t2vOM-0006IJ-7T for qemu-devel@nongnu.org; Mon, 21 Oct 2024 12:36:30 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t2vOK-0006Ln-2X for qemu-devel@nongnu.org; Mon, 21 Oct 2024 12:36:25 -0400 Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-619-5TJ3YyfQMGiyftT7h7QEfw-1; Mon, 21 Oct 2024 12:36:22 -0400 Received: by mail-wm1-f72.google.com with SMTP id 5b1f17b1804b1-431518e6d8fso32226885e9.0 for ; Mon, 21 Oct 2024 09:36:22 -0700 (PDT) Received: from avogadro.local ([151.95.144.54]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4316f5709efsm63926925e9.10.2024.10.21.09.36.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Oct 2024 09:36:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1729528583; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Qr5dagb8vQ3bDNxUa7EXxPicbCEKo86t7f8oVBzNrBQ=; b=XENkGCsOzPl1nrfhusyvB++SFMKpgsTM86HLqFyTEt+lNNTLSdcpOUI9m3mrr5KDpfpZVT stthyp/+TKyDdflHvLoec2iVj4JQQBtzGwbK+nOnBKN0wYCHcACF2kOaErbbQ2nPryXO7g KdovhL8AAbIRyahcMzL2pDD/FGPbL0M= X-MC-Unique: 5TJ3YyfQMGiyftT7h7QEfw-1 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729528580; x=1730133380; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Qr5dagb8vQ3bDNxUa7EXxPicbCEKo86t7f8oVBzNrBQ=; b=ldu/LlQqjoxSmzLkiQo8QonXVBIG6urXMYOvt/pLIlQ5w8zLic4vu/921ksD50O1zk IFVxCwOnA+t1fXJLdE2N01EN7GW6iH/Py2g6Is1IuwzyBlWs+gSVZNmvQPzDigt+CxHt 4lGyXp8lHZ3sTCLKq16ZzbWDyk+HI4DupVgv8SP2M5hCeqLc1mD1C/yJML80+gVxOz5R opmZtaOxFvjIyNJ5v28hRnXcz4Be4iiC/bBv2FLPh1bCwgTWWItcTYlMqFAkWQjpqHdn XTd0/Ity8dKqnMSN5951hjKXpwo9dRIpS1gfxGvbXWU8jawKPr4Nyb5E0S1xd2dcRGmq /3vA== X-Gm-Message-State: AOJu0Yw8x1bcbKikDrrfoCa8azw+5q11vxMdZpjFBUi1USn35z2IGd86 CLldoouL+4hbl0lJNGfjixgiIx59C7Tiui1HuU/smKInfiOxoWnUz8Kb+UBZwhI6xpiE9b/OKAZ KwSGetzs4fOSRjRBr8IdMMWUYNZFnoDoXW/kz6x6rYwCUqL2J81JlFNNYf+hCNZffXJ4UgUC1+z 2V5nqOLKvMwwSiYB7u45WMqY8T72Wrn2SlpUrjAfU= X-Received: by 2002:a05:600c:4751:b0:431:612f:189b with SMTP id 5b1f17b1804b1-43161649510mr87412265e9.12.1729528579913; Mon, 21 Oct 2024 09:36:19 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHlDNUJ9aNFHH9akQxzvIEapV8Kx8cor6fWetajxrgiuBLxLfD496WyLG6iD92BJfxFAHhtPw== X-Received: by 2002:a05:600c:4751:b0:431:612f:189b with SMTP id 5b1f17b1804b1-43161649510mr87412035e9.12.1729528579456; Mon, 21 Oct 2024 09:36:19 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: Manos Pitsidianakis , Junjie Mao Subject: [PATCH v2 11/13] rust: make properties array immutable Date: Mon, 21 Oct 2024 18:35:36 +0200 Message-ID: <20241021163538.136941-12-pbonzini@redhat.com> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241021163538.136941-1-pbonzini@redhat.com> References: <20241021163538.136941-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.421, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1.699, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1729528647650116600 Content-Type: text/plain; charset="utf-8" Now that device_class_set_props() takes a const pointer, the only part of "define_property!" that needs to be non-const is the call to try_into(). This in turn will only break if offset_of returns a value with the most significant bit set (i.e. a struct size that is >=3D2^31 or >=3D 2^63, respectively on 32- and 64-bit system), which is impossible. Just use a cast and clean everything up to remove the run-time initialization. This also removes a use of OnceLock, which was only stabilized in 1.70.0. Signed-off-by: Paolo Bonzini --- rust/qemu-api/src/device_class.rs | 42 ++++++------------------------- 1 file changed, 8 insertions(+), 34 deletions(-) diff --git a/rust/qemu-api/src/device_class.rs b/rust/qemu-api/src/device_c= lass.rs index 5aba426d243..d885f2fcf19 100644 --- a/rust/qemu-api/src/device_class.rs +++ b/rust/qemu-api/src/device_class.rs @@ -2,10 +2,6 @@ // Author(s): Manos Pitsidianakis // SPDX-License-Identifier: GPL-2.0-or-later =20 -use std::sync::OnceLock; - -use crate::bindings::Property; - #[macro_export] macro_rules! device_class_init { ($func:ident, props =3D> $props:ident, realize_fn =3D> $realize_fn:exp= r, legacy_reset_fn =3D> $legacy_reset_fn:expr, vmsd =3D> $vmsd:ident$(,)*) = =3D> { @@ -19,7 +15,7 @@ macro_rules! device_class_init { dc.as_mut().realize =3D $realize_fn; dc.as_mut().vmsd =3D &$vmsd; $crate::bindings::device_class_set_legacy_reset(dc.as_mut(= ), $legacy_reset_fn); - $crate::bindings::device_class_set_props(dc.as_mut(), $pro= ps.as_mut_ptr()); + $crate::bindings::device_class_set_props(dc.as_mut(), $pro= ps.as_ptr()); } } }; @@ -32,9 +28,7 @@ macro_rules! define_property { // use associated function syntax for type checking name: ::core::ffi::CStr::as_ptr($name), info: $prop, - offset: ::core::mem::offset_of!($state, $field) - .try_into() - .expect("Could not fit offset value to type"), + offset: ::core::mem::offset_of!($state, $field) as isize, set_default: true, defval: $crate::bindings::Property__bindgen_ty_1 { u: $defval.= into() }, ..unsafe { ::core::mem::MaybeUninit::<$crate::bindings::Proper= ty>::zeroed().assume_init() } @@ -45,47 +39,27 @@ macro_rules! define_property { // use associated function syntax for type checking name: ::core::ffi::CStr::as_ptr($name), info: $prop, - offset: ::core::mem::offset_of!($state, $field) - .try_into() - .expect("Could not fit offset value to type"), + offset: ::core::mem::offset_of!($state, $field) as isize, set_default: false, ..unsafe { ::core::mem::MaybeUninit::<$crate::bindings::Proper= ty>::zeroed().assume_init() } } }; } =20 -#[repr(C)] -pub struct Properties(pub OnceLock<[Property; N]>, pub fn(= ) -> [Property; N]); - -impl Properties { - pub fn as_mut_ptr(&mut self) -> *mut Property { - _ =3D self.0.get_or_init(self.1); - self.0.get_mut().unwrap().as_mut_ptr() - } -} - #[macro_export] macro_rules! declare_properties { ($ident:ident, $($prop:expr),*$(,)*) =3D> { - - const fn _calc_prop_len() -> usize { + pub static $ident: [$crate::bindings::Property; { let mut len =3D 1; $({ _ =3D stringify!($prop); len +=3D 1; })* len - } - const PROP_LEN: usize =3D _calc_prop_len(); - - fn _make_properties() -> [$crate::bindings::Property; PROP_LEN] { - [ - $($prop),*, - unsafe { ::core::mem::MaybeUninit::<$crate::bindings::= Property>::zeroed().assume_init() }, - ] - } - - pub static mut $ident: $crate::device_class::Properties = =3D $crate::device_class::Properties(::std::sync::OnceLock::new(), _make_pr= operties); + }] =3D [ + $($prop),*, + unsafe { ::core::mem::MaybeUninit::<$crate::bindings::Property= >::zeroed().assume_init() }, + ]; }; } =20 --=20 2.46.2