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From: Steven Rostedt <rostedt@goodmis.org>
To: linux-trace-devel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, Tom Zanussi <zanussi@kernel.org>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	linux-rt-users <linux-rt-users@vger.kernel.org>,
	Clark Williams <williams@redhat.com>,
	"Steven Rostedt (VMware)" <rostedt@goodmis.org>
Subject: [PATCH v3 16/22] libtracefs: Add error message when calculation has no label
Date: Tue,  3 Aug 2021 13:06:00 -0400	[thread overview]
Message-ID: <20210803170606.694085-17-rostedt@goodmis.org> (raw)
In-Reply-To: <20210803170606.694085-1-rostedt@goodmis.org>

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

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) <rostedt@goodmis.org>
---
 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:
-- 
2.30.2


  parent reply	other threads:[~2021-08-03 17:06 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-03 17:05 [PATCH v3 00/22] libtracefs: Introducing tracefs_sql() to create synthetice events with an SQL line Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 01/22] libtracefs: Added new API tracefs_sql() Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 02/22] tracefs: Add unit tests for tracefs_sql() Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 03/22] libtracefs: Add comparing start and end fields in tracefs_sql() Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 04/22] libtracefs: Add unit test to test tracefs_sql() compare Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 05/22] libtracefs: Add filtering for start and end events in tracefs_sql() Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 06/22] libtracefs: Add unit test to test tracefs_sql() where clause Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 07/22] libtracefs: Make sqlhist parser reentrant Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 08/22] libtracefs: Make parser unique to libtracefs Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 09/22] libtracefs: Add line number and index to expr structure Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 10/22] libtracefs: Add error message when match fields are not FROM and JOIN events Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 11/22] libtracefs: Add error message when match or init fails from bad events Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 12/22] libtracefs; Add error message for bad selections to SQL sequence Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 13/22] libtracefs: Add error message when compare fields fail Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 14/22] libtracefs: Add error message for grouping events in SQL filter Steven Rostedt
2021-08-03 17:05 ` [PATCH v3 15/22] libtracefs: Add error message for bad filters in SQL statement Steven Rostedt
2021-08-03 17:06 ` Steven Rostedt [this message]
2021-08-03 17:06 ` [PATCH v3 17/22] libtracefs: Add man page for tracefs_sql() Steven Rostedt
2021-08-03 17:06 ` [PATCH v3 18/22] libtracefs: Add Makefile rule to create sqlhist Steven Rostedt
2021-08-03 17:06 ` [PATCH v3 19/22] libtracefs: Allow for simple SQL statements to create a histogram Steven Rostedt
2021-08-03 17:06 ` [PATCH v3 20/22] libtracefs: Allow trace_sql() to take keywords for fields with backslash Steven Rostedt
2021-08-03 17:06 ` [PATCH v3 21/22] libtracefs: Add CAST() syntax to SQL parsing for histogram types Steven Rostedt
2021-08-03 17:06 ` [PATCH v3 22/22] libtracefs: Add CAST(x AS _COUNTER_) syntax to create values in histograms Steven Rostedt

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