From patchwork Wed Dec 20 13:47:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 13500127 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 27F8EC46CD2 for ; Wed, 20 Dec 2023 13:49:25 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rFwvj-0003WG-Pr; Wed, 20 Dec 2023 08:48:11 -0500 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 1rFwvg-0003Va-Tx for qemu-devel@nongnu.org; Wed, 20 Dec 2023 08:48:08 -0500 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 1rFwvf-00066X-9H for qemu-devel@nongnu.org; Wed, 20 Dec 2023 08:48:08 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1703080086; 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=dIrNM1TF5I8ezOLSZGY6F1DG1/wLrSeiRqVigxRxAvs=; b=QvFFaRUoMRVVDapFLAzFooX4tv6zKvkcxndgGOmxCjZHHbsnXSFl1LeNKKWPiuXHx6KXtd zvaXUrh9AbOL4R73mj6hRvQMOBMaHHm/qfCAP63hezJsTYiSdxx2w5v+EGBIxglM4jShZn N81igw9qh5EYwnzxVgEuB/JE7ZPQJ2A= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-121-MX3PdRdCOXCNQARMfilMkg-1; Wed, 20 Dec 2023 08:48:03 -0500 X-MC-Unique: MX3PdRdCOXCNQARMfilMkg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0676B3C32066; Wed, 20 Dec 2023 13:48:03 +0000 (UTC) Received: from localhost (unknown [10.39.192.73]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6D6BF2166B34; Wed, 20 Dec 2023 13:48:02 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: Michal Privoznik , Kevin Wolf , Hanna Reitz , , "Michael S. Tsirkin" , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Stefan Hajnoczi , Michael Roth , Eduardo Habkost , Eric Blake , Markus Armbruster , Paolo Bonzini Subject: [PATCH v4 2/4] string-output-visitor: show structs as "" Date: Wed, 20 Dec 2023 08:47:53 -0500 Message-ID: <20231220134755.814917-3-stefanha@redhat.com> In-Reply-To: <20231220134755.814917-1-stefanha@redhat.com> References: <20231220134755.814917-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 Received-SPF: pass client-ip=170.10.129.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.063, 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org StringOutputVisitor crashes when it visits a struct because ->start_struct() is NULL. Show "" instead of crashing. This is necessary because the virtio-blk-pci iothread-vq-mapping parameter that I'd like to introduce soon is a list of IOThreadMapping structs. This patch is a quick fix to solve the crash, but the long-term solution is replacing StringOutputVisitor with something that can handle the full gamut of values in QEMU. Reviewed-by: Markus Armbruster Signed-off-by: Stefan Hajnoczi --- include/qapi/string-output-visitor.h | 6 +++--- qapi/string-output-visitor.c | 16 ++++++++++++++++ 2 files changed, 19 insertions(+), 3 deletions(-) diff --git a/include/qapi/string-output-visitor.h b/include/qapi/string-output-visitor.h index 268dfe9986..b1ee473b30 100644 --- a/include/qapi/string-output-visitor.h +++ b/include/qapi/string-output-visitor.h @@ -26,9 +26,9 @@ typedef struct StringOutputVisitor StringOutputVisitor; * If everything else succeeds, pass @result to visit_complete() to * collect the result of the visit. * - * The string output visitor does not implement support for visiting - * QAPI structs, alternates, null, or arbitrary QTypes. It also - * requires a non-null list argument to visit_start_list(). + * The string output visitor does not implement support for alternates, null, + * or arbitrary QTypes. Struct fields are not shown. It also requires a + * non-null list argument to visit_start_list(). */ Visitor *string_output_visitor_new(bool human, char **result); diff --git a/qapi/string-output-visitor.c b/qapi/string-output-visitor.c index c0cb72dbe4..f0c1dea89e 100644 --- a/qapi/string-output-visitor.c +++ b/qapi/string-output-visitor.c @@ -292,6 +292,20 @@ static bool print_type_null(Visitor *v, const char *name, QNull **obj, return true; } +static bool start_struct(Visitor *v, const char *name, void **obj, + size_t size, Error **errp) +{ + return true; +} + +static void end_struct(Visitor *v, void **obj) +{ + StringOutputVisitor *sov = to_sov(v); + + /* TODO actually print struct fields */ + string_output_set(sov, g_strdup("")); +} + static bool start_list(Visitor *v, const char *name, GenericList **list, size_t size, Error **errp) @@ -379,6 +393,8 @@ Visitor *string_output_visitor_new(bool human, char **result) v->visitor.type_str = print_type_str; v->visitor.type_number = print_type_number; v->visitor.type_null = print_type_null; + v->visitor.start_struct = start_struct; + v->visitor.end_struct = end_struct; v->visitor.start_list = start_list; v->visitor.next_list = next_list; v->visitor.end_list = end_list;