Re: [PATCH perf/core v4 4/4] perf probe: Cleanup and consolidate command parsers

[Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>]

On 2015/05/05 11:29, Masami Hiramatsu wrote:
> To simplify the perf-probe command code, consolidate some
> similar functions and use command short-name for command
> classification, instead of separated booleans.

Oops, I've found my mistake on this patch. perf-probe without
any command but probe defs should imply "--add", but this patch
drops that.
I'll update this for v5 patch.

Thank you,

> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
> ---
>  tools/perf/builtin-probe.c |  105 ++++++++++++++++----------------------------
>  1 file changed, 37 insertions(+), 68 deletions(-)
> 
> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
> index 08c9481..17870b8 100644
> --- a/tools/perf/builtin-probe.c
> +++ b/tools/perf/builtin-probe.c
> @@ -48,14 +48,10 @@
>  
>  /* Session management structure */
>  static struct {
> +	int command;	/* Command short_name */
>  	bool list_events;
>  	bool force_add;
> -	bool show_lines;
> -	bool show_vars;
>  	bool show_ext_vars;
> -	bool show_funcs;
> -	bool mod_events;
> -	bool del_events;
>  	bool uprobes;
>  	bool quiet;
>  	bool target_used;
> @@ -175,44 +171,11 @@ static int parse_probe_event_argv(int argc, const char **argv)
>  
>  		len += sprintf(&buf[len], "%s ", argv[i]);
>  	}
> -	params.mod_events = true;
>  	ret = parse_probe_event(buf);
>  	free(buf);
>  	return ret;
>  }
>  
> -static int opt_add_probe_event(const struct option *opt __maybe_unused,
> -			      const char *str, int unset __maybe_unused)
> -{
> -	if (str) {
> -		params.mod_events = true;
> -		return parse_probe_event(str);
> -	} else
> -		return 0;
> -}
> -
> -static int opt_del_probe_event(const struct option *opt __maybe_unused,
> -			       const char *str, int unset __maybe_unused)
> -{
> -	if (str) {
> -		params.del_events = true;
> -		return params_add_filter(str);
> -	}
> -	return 0;
> -}
> -
> -static int opt_list_probe_event(const struct option *opt __maybe_unused,
> -				const char *str, int unset)
> -{
> -	if (!unset)
> -		params.list_events = true;
> -
> -	if (str)
> -		return params_add_filter(str);
> -
> -	return 0;
> -}
> -
>  static int opt_set_target(const struct option *opt, const char *str,
>  			int unset __maybe_unused)
>  {
> @@ -250,8 +213,10 @@ static int opt_set_target(const struct option *opt, const char *str,
>  	return ret;
>  }
>  
> +/* Command option callbacks */
> +
>  #ifdef HAVE_DWARF_SUPPORT
> -static int opt_show_lines(const struct option *opt __maybe_unused,
> +static int opt_show_lines(const struct option *opt,
>  			  const char *str, int unset __maybe_unused)
>  {
>  	int ret = 0;
> @@ -259,19 +224,19 @@ static int opt_show_lines(const struct option *opt __maybe_unused,
>  	if (!str)
>  		return 0;
>  
> -	if (params.show_lines) {
> +	if (params.command == 'L') {
>  		pr_warning("Warning: more than one --line options are"
>  			   " detected. Only the first one is valid.\n");
>  		return 0;
>  	}
>  
> -	params.show_lines = true;
> +	params.command = opt->short_name;
>  	ret = parse_line_range_desc(str, &params.line_range);
>  
>  	return ret;
>  }
>  
> -static int opt_show_vars(const struct option *opt __maybe_unused,
> +static int opt_show_vars(const struct option *opt,
>  			 const char *str, int unset __maybe_unused)
>  {
>  	struct perf_probe_event *pev = &params.events[params.nevents];
> @@ -285,16 +250,27 @@ static int opt_show_vars(const struct option *opt __maybe_unused,
>  		pr_err("  Error: '--vars' doesn't accept arguments.\n");
>  		return -EINVAL;
>  	}
> -	params.show_vars = true;
> +	params.command = opt->short_name;
>  
>  	return ret;
>  }
>  #endif
> -static int opt_show_funcs(const struct option *opt __maybe_unused,
> -			  const char *str, int unset)
> +static int opt_add_probe_event(const struct option *opt,
> +			      const char *str, int unset __maybe_unused)
> +{
> +	if (str) {
> +		params.command = opt->short_name;
> +		return parse_probe_event(str);
> +	}
> +
> +	return 0;
> +}
> +
> +static int opt_set_filter_with_command(const struct option *opt,
> +				       const char *str, int unset)
>  {
>  	if (!unset)
> -		params.show_funcs = true;
> +		params.command = opt->short_name;
>  
>  	if (str)
>  		return params_add_filter(str);
> @@ -360,10 +336,10 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
>  	OPT_BOOLEAN('q', "quiet", &params.quiet,
>  		    "be quiet (do not show any mesages)"),
>  	OPT_CALLBACK_DEFAULT('l', "list", NULL, "[GROUP:]EVENT",
> -			     "list up probe events", opt_list_probe_event,
> -			     DEFAULT_LIST_FILTER),
> +			     "list up probe events",
> +			     opt_set_filter_with_command, DEFAULT_LIST_FILTER),
>  	OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
> -		opt_del_probe_event),
> +		     opt_set_filter_with_command),
>  	OPT_CALLBACK('a', "add", NULL,
>  #ifdef HAVE_DWARF_SUPPORT
>  		"[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
> @@ -412,7 +388,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
>  		 "Set how many probe points can be found for a probe."),
>  	OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
>  			     "Show potential probe-able functions.",
> -			     opt_show_funcs, DEFAULT_FUNC_FILTER),
> +			     opt_set_filter_with_command, DEFAULT_FUNC_FILTER),
>  	OPT_CALLBACK('\0', "filter", NULL,
>  		     "[!]FILTER", "Set a filter (with --vars/funcs only)\n"
>  		     "\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
> @@ -462,16 +438,13 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
>  	if (params.max_probe_points == 0)
>  		params.max_probe_points = MAX_PROBES;
>  
> -	if ((!params.nevents && !params.del_events && !params.list_events &&
> -	     !params.show_lines && !params.show_funcs))
> -		usage_with_options(probe_usage, options);
> -
>  	/*
>  	 * Only consider the user's kernel image path if given.
>  	 */
>  	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
>  
> -	if (params.list_events) {
> +	switch (params.command) {
> +	case 'l':
>  		if (params.uprobes) {
>  			pr_warning("  Error: Don't use --list with --exec.\n");
>  			usage_with_options(probe_usage, options);
> @@ -480,24 +453,20 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
>  		if (ret < 0)
>  			pr_err_with_code("  Error: Failed to show event list.", ret);
>  		return ret;
> -	}
> -	if (params.show_funcs) {
> +	case 'F':
>  		ret = show_available_funcs(params.target, params.filter,
>  					params.uprobes);
>  		if (ret < 0)
>  			pr_err_with_code("  Error: Failed to show functions.", ret);
>  		return ret;
> -	}
> -
>  #ifdef HAVE_DWARF_SUPPORT
> -	if (params.show_lines) {
> +	case 'L':
>  		ret = show_line_range(&params.line_range, params.target,
>  				      params.uprobes);
>  		if (ret < 0)
>  			pr_err_with_code("  Error: Failed to show lines.", ret);
>  		return ret;
> -	}
> -	if (params.show_vars) {
> +	case 'V':
>  		if (!params.filter)
>  			params.filter = strfilter__new(DEFAULT_VAR_FILTER,
>  						       NULL);
> @@ -510,18 +479,15 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
>  		if (ret < 0)
>  			pr_err_with_code("  Error: Failed to show vars.", ret);
>  		return ret;
> -	}
>  #endif
> -
> -	if (params.del_events) {
> +	case 'd':
>  		ret = del_perf_probe_events(params.filter);
>  		if (ret < 0) {
>  			pr_err_with_code("  Error: Failed to delete events.", ret);
>  			return ret;
>  		}
> -	}
> -
> -	if (params.nevents) {
> +		break;
> +	case 'a':
>  		/* Ensure the last given target is used */
>  		if (params.target && !params.target_used) {
>  			pr_warning("  Error: -x/-m must follow the probe definitions.\n");
> @@ -535,6 +501,9 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
>  			pr_err_with_code("  Error: Failed to add events.", ret);
>  			return ret;
>  		}
> +		break;
> +	default:
> +		usage_with_options(probe_usage, options);
>  	}
>  	return 0;
>  }
> 
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-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@hitachi.com