From patchwork Tue Aug 3 17:06:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Rostedt X-Patchwork-Id: 12416887 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9798BC4338F for ; Tue, 3 Aug 2021 17:06:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8513060F70 for ; Tue, 3 Aug 2021 17:06:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237847AbhHCRGo (ORCPT ); Tue, 3 Aug 2021 13:06:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:38766 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237546AbhHCRGU (ORCPT ); Tue, 3 Aug 2021 13:06:20 -0400 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0EFAB61183; Tue, 3 Aug 2021 17:06:09 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.94.2) (envelope-from ) id 1mAxrj-002uc8-Vg; Tue, 03 Aug 2021 13:06:07 -0400 From: Steven Rostedt To: linux-trace-devel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Tom Zanussi , Daniel Bristot de Oliveira , Masami Hiramatsu , Namhyung Kim , linux-rt-users , Clark Williams , "Steven Rostedt (VMware)" Subject: [PATCH v3 16/22] libtracefs: Add error message when calculation has no label Date: Tue, 3 Aug 2021 13:06:00 -0400 Message-Id: <20210803170606.694085-17-rostedt@goodmis.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210803170606.694085-1-rostedt@goodmis.org> References: <20210803170606.694085-1-rostedt@goodmis.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org From: "Steven Rostedt (VMware)" If a calculation between event fields is performed and there's no label (name) for it, it errors out, causing the bison parser to give a strange error: FAILED MEMORY: add_selection(sb, (yyvsp[0].expr), NULL) Failed creating synthetic event!: No such file or directory Instead, just set the compare->name field to NULL, and report a better error later on in the processing. ERROR: 'no name' Field calculations must be labeled 'AS name' Signed-off-by: Steven Rostedt (VMware) --- src/tracefs-sqlhist.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/src/tracefs-sqlhist.c b/src/tracefs-sqlhist.c index d7829d4804b1..81a0cd1a908b 100644 --- a/src/tracefs-sqlhist.c +++ b/src/tracefs-sqlhist.c @@ -243,8 +243,6 @@ __hidden int add_selection(struct sqlhist_bison *sb, void *select, case EXPR_FIELD: break; case EXPR_COMPARE: - if (!name) - return -1; expr->compare.name = name; break; case EXPR_NUMBER: @@ -779,6 +777,9 @@ static int build_compare(struct tracefs_synth *synth, enum tracefs_synth_calc calc; int ret; + if (!compare->name) + return -1; + lval = &compare->lval->field; rval = &compare->rval->field; @@ -1117,6 +1118,14 @@ static void compare_error(struct tep_handle *tep, { struct compare *compare = &expr->compare; + if (!compare->name) { + sb->line_no = expr->line; + sb->line_idx = expr->idx + strlen("no name"); + + parse_error(sb, "no name", + "Field calculations must be labeled 'AS name'\n"); + } + switch (errno) { case ENODEV: case EBADE: