linux-kernel - Re: [PATCH v3 7/7] selftests/ftrace: Add test case for synthetic event syntax errors

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Message-ID: <6cfecc21b67c5aa7e91dfa58b5e59f8545e6524f.camel@kernel.org>
Date:   Thu, 15 Oct 2020 08:59:40 -0500
From:   Tom Zanussi <zanussi@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     rostedt@...dmis.org, axelrasmussen@...gle.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 7/7] selftests/ftrace: Add test case for synthetic
 event syntax errors

Hi Masami,

On Wed, 2020-10-14 at 11:06 +0900, Masami Hiramatsu wrote:
> Hi Tom,
> 
> On Tue, 13 Oct 2020 09:17:58 -0500
> Tom Zanussi <zanussi@...nel.org> wrote:
> 
> > Add a selftest that verifies that the syntax error messages and
> > caret
> > positions are correct for most of the possible synthetic event
> > syntax
> > error cases.
> > 
> > Signed-off-by: Tom Zanussi <zanussi@...nel.org>
> > ---
> >  .../trigger-synthetic_event_syntax_errors.tc  | 19
> > +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> >  create mode 100644
> > tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-
> > synthetic_event_syntax_errors.tc
> > 
> > diff --git a/tools/testing/selftests/ftrace/test.d/trigger/inter-
> > event/trigger-synthetic_event_syntax_errors.tc
> > b/tools/testing/selftests/ftrace/test.d/trigger/inter-
> > event/trigger-synthetic_event_syntax_errors.tc
> > new file mode 100644
> > index 000000000000..ada594fe16cb
> > --- /dev/null
> > +++ b/tools/testing/selftests/ftrace/test.d/trigger/inter-
> > event/trigger-synthetic_event_syntax_errors.tc
> > @@ -0,0 +1,19 @@
> > +#!/bin/sh
> > +# SPDX-License-Identifier: GPL-2.0
> > +# description: event trigger - test synthetic_events syntax parser
> > errors
> > +# requires: synthetic_events error_log
> 
> This also requires dynamic strings support. So, its "requires" line
> should be
> 
> # requires: synthetic_events error_log "char name[]' >>
> synthetic_events":README
> 

Yes, thanks for reminding me. ;-)

> > +
> > +check_error() { # command-with-error-pos-by-^
> > +    ftrace_errlog_check 'synthetic_events' "$1" 'synthetic_events'
> > +}
> > +
> 
> BTW, some errors looks a bit odd.
> 
> > +check_error 'myevent ^chr arg'			# INVALID_TYPE
> > +check_error 'myevent ^char str[];; int v'	# INVALID_TYPE
> 
> I think there is a wrong "void" argument between ";", instead of
> invalid type.

Yes, you're right.  I think the solution overall is to just treat
semicolons as whitespace.

> 
> > +check_error 'myevent char ^str]; int v'		# INVALID_NAME
> > +check_error 'myevent char ^str;[]'		# INVALID_NAME
> 
> This is also not an invalid name but '[]' is an invalid type. 
> 
> > +check_error 'myevent ^char str[; int v'		# INVALID_TYPE
> > +check_error '^mye;vent char str[]'		# BAD_NAME
> > +check_error 'myevent char str[]; ^int'		# INVALID_FIELD
> 
> Isn't it an incomplete command?

Yes, but also an invalid field.  I'll try to refine these errors a bit
and make these more consistent.

Tom

> 
> > +check_error '^myevent'				#
> > INCOMPLETE_CMD
> > +
> > +exit 0
> 
> Thank you,
> 
> > -- 
> > 2.17.1
> > 
> 
>