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Message-ID: <20140318181525.GE6482@ghostprotocols.net>
Date: Tue, 18 Mar 2014 15:15:25 -0300
From: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To: Adrien BAK <adrien.bak@...ascale.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Paul Mackerras <paulus@...ba.org>,
Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
Mathias Gaunard <mathias.gaunard@...ascale.org>
Subject: Re: [PATCH] perf-script : improves option passing mechansim
Em Tue, Mar 18, 2014 at 05:09:33PM +0100, Adrien BAK escreveu:
> This pull request fixes the following issues :
> * when passing custom arguments to a script, if those arguments are
> not declared within perf, they prevent the execution of perf.
> e.g.
>
> perf script -i path/to/perf.data -s my_script -arg1 arg_value
>
> perf will issue an error message and no processing will occur
I haven't tested this, but what comes to mind is the use of -- to
separate what options should be processed by perf and which ones should
be left to the script, is that what you're fixing?
- Arnaldo
>
> * when passing custom arguments to a script, if those arguments are
> declared by perf, they are consumed and not passed to the script.
> e.g.
> perf script -i path/to/perf.data -s my_script -h
>
> perf will display its own help message, instead of the expected help
> message from my_script.
>
> These issues are addressed as follows :
> * The parse option flag is changed from PARSE_OPT_STOP_AT_NON_OPTION to
> PARSE_OPT_KEEP_UNKNOWN
> * A new option type is introduce OPT_CALLBACK_FINAL_OPTION, which
> effectively
> prevents the parsing of all options located after the script.
>
> Signed-off-by: Adrien Bak <adrien.bak@...ascale.org>
>
> ---
>
> tools/perf/builtin-script.c | 8 ++++----
> tools/perf/util/parse-options.c | 4 ++++
> tools/perf/util/parse-options.h | 5 +++++
> 3 files changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 9e9c91f..3cd6a46 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -1523,9 +1523,9 @@ int cmd_script(int argc, const char **argv,
> const char *prefix __maybe_unused)
> "show latency attributes (irqs/preemption disabled, etc)"),
> OPT_CALLBACK_NOOPT('l', "list", NULL, NULL, "list available scripts",
> list_available_scripts),
> - OPT_CALLBACK('s', "script", NULL, "name",
> - "script file name (lang:script name, script name, or *)",
> - parse_scriptname),
> + OPT_CALLBACK_FINAL_OPTION('s', "script", NULL, "name",
> + "script file name (lang:script name, script name, or *)",
> + parse_scriptname),
> OPT_STRING('g', "gen-script", &generate_script_lang, "lang",
> "generate perf-script.xx script in specified language"),
> OPT_STRING('i', "input", &input_name, "file", "input file name"),
> @@ -1578,7 +1578,7 @@ int cmd_script(int argc, const char **argv,
> const char *prefix __maybe_unused)
> setup_scripting();
>
> argc = parse_options(argc, argv, options, script_usage,
> - PARSE_OPT_STOP_AT_NON_OPTION);
> + PARSE_OPT_KEEP_UNKNOWN);
>
> file.path = input_name;
>
> diff --git a/tools/perf/util/parse-options.c
> b/tools/perf/util/parse-options.c
> index d22e3f8..77f566d 100644
> --- a/tools/perf/util/parse-options.c
> +++ b/tools/perf/util/parse-options.c
> @@ -112,6 +112,8 @@ static int get_value(struct parse_opt_ctx_t *p,
> return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
> if (get_arg(p, opt, flags, &arg))
> return -1;
> + if (opt->flags & PARSE_OPT_FINAL_OPTION)
> + return (*opt->callback)(opt, arg, 0)?(-1) : (-3);
> return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
>
> case OPTION_INTEGER:
> @@ -366,6 +368,8 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
> return parse_options_usage(usagestr, options, arg + 1, 1);
> case -2:
> goto unknown;
> + case -3:
> + return PARSE_OPT_DONE;
> default:
> break;
> }
> diff --git a/tools/perf/util/parse-options.h
> b/tools/perf/util/parse-options.h
> index cbf0149..b1fa6b6 100644
> --- a/tools/perf/util/parse-options.h
> +++ b/tools/perf/util/parse-options.h
> @@ -38,6 +38,7 @@ enum parse_opt_option_flags {
> PARSE_OPT_NONEG = 4,
> PARSE_OPT_HIDDEN = 8,
> PARSE_OPT_LASTARG_DEFAULT = 16,
> + PARSE_OPT_FINAL_OPTION = 32,
> };
>
> struct option;
> @@ -123,6 +124,10 @@ struct option {
> { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l),
> .value = (v), .argh = "time", .help = (h), .callback =
> parse_opt_approxidate_cb }
> #define OPT_CALLBACK(s, l, v, a, h, f) \
> { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l),
> .value = (v), (a), .help = (h), .callback = (f) }
> +#define OPT_CALLBACK_FINAL_OPTION(s, l, v, a, h, f) \
> + { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l),\
> + .value = (v), (a), .help = (h), .callback = (f),\
> + .flags = PARSE_OPT_FINAL_OPTION}
> #define OPT_CALLBACK_NOOPT(s, l, v, a, h, f) \
> { .type = OPTION_CALLBACK, .short_name = (s), .long_name = (l),
> .value = (v), (a), .help = (h), .callback = (f), .flags =
> PARSE_OPT_NOARG }
> #define OPT_CALLBACK_DEFAULT(s, l, v, a, h, f, d) \
--
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