From patchwork Tue Sep 29 22:21:13 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 524603 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id BB9611402B6 for ; Thu, 1 Oct 2015 07:29:09 +1000 (AEST) Received: from localhost ([::1]:33525 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZhOvy-0004kf-Nf for incoming@patchwork.ozlabs.org; Wed, 30 Sep 2015 17:29:06 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35662) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zh3HC-0004Bh-32 for qemu-devel@nongnu.org; Tue, 29 Sep 2015 18:21:35 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Zh3H9-0001OM-9i for qemu-devel@nongnu.org; Tue, 29 Sep 2015 18:21:34 -0400 Received: from mx1.redhat.com ([209.132.183.28]:53425) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zh3H8-0001OC-Vm for qemu-devel@nongnu.org; Tue, 29 Sep 2015 18:21:31 -0400 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (Postfix) with ESMTPS id 8E434C0B1B59; Tue, 29 Sep 2015 22:21:30 +0000 (UTC) Received: from red.redhat.com (ovpn-113-188.phx2.redhat.com [10.3.113.188]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t8TMLInj012619; Tue, 29 Sep 2015 18:21:29 -0400 From: Eric Blake To: qemu-devel@nongnu.org Date: Tue, 29 Sep 2015 16:21:13 -0600 Message-Id: <1443565276-4535-16-git-send-email-eblake@redhat.com> In-Reply-To: <1443565276-4535-1-git-send-email-eblake@redhat.com> References: <1443565276-4535-1-git-send-email-eblake@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Michael Roth , marcandre.lureau@redhat.com, armbru@redhat.com, ehabkost@redhat.com Subject: [Qemu-devel] [PATCH v7 15/18] qapi: Share gen_err_check() 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org qapi-commands has a nice helper gen_err_check(), but did not use it everywhere. In fact, using it in more places makes it easier to reduce the lines of code used for generating error checks. This in turn will make it easier for later patches to consolidate another common pattern among the generators. The generated code has one less blank line in qapi-event.c functions, but has no semantic difference. Signed-off-by: Eric Blake --- v7: cut in half - keep only the hunks that do not subdivide a larger string v6: new, split off of 10/46, add label parameter, and catch more instances that could use it --- scripts/qapi-commands.py | 17 +++-------------- scripts/qapi-event.py | 9 ++------- scripts/qapi-visit.py | 14 +++----------- scripts/qapi.py | 12 ++++++++++++ 4 files changed, 20 insertions(+), 32 deletions(-) diff --git a/scripts/qapi-commands.py b/scripts/qapi-commands.py index 267991e..4e99c1d 100644 --- a/scripts/qapi-commands.py +++ b/scripts/qapi-commands.py @@ -25,17 +25,6 @@ def gen_command_decl(name, arg_type, ret_type): params=gen_params(arg_type, 'Error **errp')) -def gen_err_check(err): - if not err: - return '' - return mcgen(''' - if (%(err)s) { - goto out; - } -''', - err=err) - - def gen_call(name, arg_type, ret_type): ret = '' @@ -56,7 +45,7 @@ def gen_call(name, arg_type, ret_type): ''', c_name=c_name(name), args=argstr, lhs=lhs) if ret_type: - ret += gen_err_check('err') + ret += gen_err_check() ret += mcgen(''' qmp_marshal_output_%(c_name)s(retval, ret, &err); @@ -133,7 +122,7 @@ def gen_marshal_input_visit(arg_type, dealloc=False): ''', c_name=c_name(memb.name), name=memb.name, errp=errparg) - ret += gen_err_check(errarg) + ret += gen_err_check(err=errarg) ret += mcgen(''' if (has_%(c_name)s) { ''', @@ -144,7 +133,7 @@ def gen_marshal_input_visit(arg_type, dealloc=False): ''', c_name=c_name(memb.name), name=memb.name, c_type=memb.type.c_name(), errp=errparg) - ret += gen_err_check(errarg) + ret += gen_err_check(err=errarg) if memb.optional: pop_indent() ret += mcgen(''' diff --git a/scripts/qapi-event.py b/scripts/qapi-event.py index b5a9d4f..b6951e6 100644 --- a/scripts/qapi-event.py +++ b/scripts/qapi-event.py @@ -68,12 +68,9 @@ def gen_event_send(name, arg_type): /* Fake visit, as if all members are under a structure */ visit_start_struct(v, NULL, "", "%(name)s", 0, &err); - if (err) { - goto out; - } - ''', name=name) + ret += gen_err_check() for memb in arg_type.members: if memb.optional: @@ -91,14 +88,12 @@ def gen_event_send(name, arg_type): ret += mcgen(''' visit_type_%(c_type)s(v, %(cast)s&%(c_name)s, "%(name)s", &err); - if (err) { - goto out; - } ''', cast=cast, c_name=c_name(memb.name), c_type=memb.type.c_name(), name=memb.name) + ret += gen_err_check() if memb.optional: pop_indent() diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py index 78ad556..bc6911f 100644 --- a/scripts/qapi-visit.py +++ b/scripts/qapi-visit.py @@ -81,11 +81,9 @@ static void visit_type_%(c_name)s_fields(Visitor *v, %(c_name)s **obj, Error **e if base: ret += mcgen(''' visit_type_implicit_%(c_type)s(v, &(*obj)->%(c_name)s, &err); - if (err) { - goto out; - } ''', c_type=base.c_name(), c_name=c_name('base')) + ret += gen_err_check() for memb in members: if memb.optional: @@ -107,11 +105,7 @@ static void visit_type_%(c_name)s_fields(Visitor *v, %(c_name)s **obj, Error **e ret += mcgen(''' } ''') - ret += mcgen(''' - if (err) { - goto out; - } -''') + ret += gen_err_check() if re.search('^ *goto out;', ret, re.MULTILINE): ret += mcgen(''' @@ -271,11 +265,9 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error if base: ret += mcgen(''' visit_type_%(c_name)s_fields(v, obj, &err); - if (err) { - goto out_obj; - } ''', c_name=c_name(name)) + ret += gen_err_check(label='out_obj') tag_key = variants.tag_member.name if not variants.tag_name: diff --git a/scripts/qapi.py b/scripts/qapi.py index c0728d7..62a415c 100644 --- a/scripts/qapi.py +++ b/scripts/qapi.py @@ -1536,6 +1536,18 @@ def gen_params(arg_type, extra): ret += sep + extra return ret + +def gen_err_check(err='err', label='out'): + if not err: + return '' + return mcgen(''' + if (%(err)s) { + goto %(label)s; + } +''', + err=err, label=label) + + # # Common command line parsing #