From patchwork Fri Jan 29 13:48:47 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 8163321 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 05B9ABEEE5 for ; Fri, 29 Jan 2016 13:51:25 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 49C102038D for ; Fri, 29 Jan 2016 13:51:24 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 881B32038A for ; Fri, 29 Jan 2016 13:51:23 +0000 (UTC) Received: from localhost ([::1]:34233 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aP9SM-0007E9-VT for patchwork-qemu-devel@patchwork.kernel.org; Fri, 29 Jan 2016 08:51:23 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41405) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aP9QG-0003WS-O2 for qemu-devel@nongnu.org; Fri, 29 Jan 2016 08:49:13 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aP9QF-0001JG-Ob for qemu-devel@nongnu.org; Fri, 29 Jan 2016 08:49:12 -0500 Received: from mx1.redhat.com ([209.132.183.28]:43266) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aP9QF-0001Iw-BQ for qemu-devel@nongnu.org; Fri, 29 Jan 2016 08:49:11 -0500 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (Postfix) with ESMTPS id E125C8E010; Fri, 29 Jan 2016 13:49:10 +0000 (UTC) Received: from red.redhat.com (ovpn-113-130.phx2.redhat.com [10.3.113.130]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u0TDn5FL019157; Fri, 29 Jan 2016 08:49:10 -0500 From: Eric Blake To: qemu-devel@nongnu.org Date: Fri, 29 Jan 2016 06:48:47 -0700 Message-Id: <1454075341-13658-12-git-send-email-eblake@redhat.com> In-Reply-To: <1454075341-13658-1-git-send-email-eblake@redhat.com> References: <1454075341-13658-1-git-send-email-eblake@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: marcandre.lureau@redhat.com, armbru@redhat.com, Michael Roth Subject: [Qemu-devel] [PATCH v10 11/25] qapi: Track all failures between visit_start/stop X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Inside the generated code between visit_start_struct() and visit_end_struct(), we were blindly setting the error into the caller's errp parameter. But a future patch to split visit_end_struct() will require that we take action based on whether an error has occurred, which requires us to track all actions through a local err. Rewrite the visits to be more in line with the other generated calls. Generated code changes look like: | visit_start_struct(v, (void **)obj, "Abort", name, sizeof(Abort), &err); |- if (!err) { |- if (*obj) { |- visit_type_Abort_fields(v, obj, errp); |- } |- visit_end_struct(v, &err); |+ if (err) { |+ goto out; | } |+ if (!*obj) { |+ goto out_obj; |+ } |+ visit_type_Abort_fields(v, obj, &err); |+ error_propagate(errp, err); |+ err = NULL; |+out_obj: |+ visit_end_struct(v, &err); |+out: | error_propagate(errp, err); | } Signed-off-by: Eric Blake --- v10: enhance commit message, move out_obj label and drop R-b v9: enhance commit message v8: no change v7: place earlier in series v6: based loosely on v5 7/46, but mostly a rewrite to get the last generated code in the same form as all the others, so that the later conversion to split visit_check_struct() will be easier --- scripts/qapi-visit.py | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py index b93690b..ec16e36 100644 --- a/scripts/qapi-visit.py +++ b/scripts/qapi-visit.py @@ -2,7 +2,7 @@ # QAPI visitor generator # # Copyright IBM, Corp. 2011 -# Copyright (C) 2014-2015 Red Hat, Inc. +# Copyright (C) 2014-2016 Red Hat, Inc. # # Authors: # Anthony Liguori @@ -123,12 +123,18 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error Error *err = NULL; visit_start_struct(v, (void **)obj, "%(name)s", name, sizeof(%(c_name)s), &err); - if (!err) { - if (*obj) { - visit_type_%(c_name)s_fields(v, obj, errp); - } - visit_end_struct(v, &err); + if (err) { + goto out; } + if (!*obj) { + goto out_obj; + } + visit_type_%(c_name)s_fields(v, obj, &err); + error_propagate(errp, err); + err = NULL; +out_obj: + visit_end_struct(v, &err); +out: error_propagate(errp, err); } ''',