tools/perf/builtin-probe.c - kernel/msm-4.9 - Gitiles

 /*
  * builtin-probe.c
  *
  * Builtin probe command: Set up probe events by C expression
  *
  * Written by Masami Hiramatsu <mhiramat@redhat.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  *
  */
 #include <sys/utsname.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>

 #include "perf.h"
 #include "builtin.h"
 #include "util/util.h"
 #include "util/strlist.h"
 #include "util/strfilter.h"
 #include "util/symbol.h"
 #include "util/debug.h"
 #include <api/fs/debugfs.h>
 #include "util/parse-options.h"
 #include "util/probe-finder.h"
 #include "util/probe-event.h"

 #define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
 #define DEFAULT_FUNC_FILTER "!_*"
 #define DEFAULT_LIST_FILTER "*:*"

 /* Session management structure */
 static struct {
 	int command;	/* Command short_name */
 	bool list_events;
 	bool uprobes;
 	bool quiet;
 	bool target_used;
 	int nevents;
 	struct perf_probe_event events[MAX_PROBES];
 	struct line_range line_range;
 	char *target;
 	struct strfilter *filter;
 } params;

 /* Parse an event definition. Note that any error must die. */
 static int parse_probe_event(const char *str)
 {
 	struct perf_probe_event *pev = &params.events[params.nevents];
 	int ret;

 	pr_debug("probe-definition(%d): %s\n", params.nevents, str);
 	if (++params.nevents == MAX_PROBES) {
 		pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
 		return -1;
 	}

 	pev->uprobes = params.uprobes;
 	if (params.target) {
 		pev->target = strdup(params.target);
 		if (!pev->target)
 			return -ENOMEM;
 		params.target_used = true;
 	}

 	/* Parse a perf-probe command into event */
 	ret = parse_perf_probe_command(str, pev);
 	pr_debug("%d arguments\n", pev->nargs);

 	return ret;
 }

 static int params_add_filter(const char *str)
 {
 	const char *err = NULL;
 	int ret = 0;

 	pr_debug2("Add filter: %s\n", str);
 	if (!params.filter) {
 		params.filter = strfilter__new(str, &err);
 		if (!params.filter)
 			ret = err ? -EINVAL : -ENOMEM;
 	} else
 		ret = strfilter__or(params.filter, str, &err);

 	if (ret == -EINVAL) {
 		pr_err("Filter parse error at %td.\n", err - str + 1);
 		pr_err("Source: \"%s\"\n", str);
 		pr_err("         %*c\n", (int)(err - str + 1), '^');
 	}

 	return ret;
 }

 static int set_target(const char *ptr)
 {
 	int found = 0;
 	const char *buf;

 	/*
 	 * The first argument after options can be an absolute path
 	 * to an executable / library or kernel module.
 	 *
 	 * TODO: Support relative path, and $PATH, $LD_LIBRARY_PATH,
 	 * short module name.
 	 */
 	if (!params.target && ptr && *ptr == '/') {
 		params.target = strdup(ptr);
 		if (!params.target)
 			return -ENOMEM;
 		params.target_used = false;

 		found = 1;
 		buf = ptr + (strlen(ptr) - 3);

 		if (strcmp(buf, ".ko"))
 			params.uprobes = true;

 	}

 	return found;
 }

 static int parse_probe_event_argv(int argc, const char **argv)
 {
 	int i, len, ret, found_target;
 	char *buf;

 	found_target = set_target(argv[0]);
 	if (found_target < 0)
 		return found_target;

 	if (found_target && argc == 1)
 		return 0;

 	/* Bind up rest arguments */
 	len = 0;
 	for (i = 0; i < argc; i++) {
 		if (i == 0 && found_target)
 			continue;

 		len += strlen(argv[i]) + 1;
 	}
 	buf = zalloc(len + 1);
 	if (buf == NULL)
 		return -ENOMEM;
 	len = 0;
 	for (i = 0; i < argc; i++) {
 		if (i == 0 && found_target)
 			continue;

 		len += sprintf(&buf[len], "%s ", argv[i]);
 	}
 	ret = parse_probe_event(buf);
 	free(buf);
 	return ret;
 }

 static int opt_set_target(const struct option *opt, const char *str,
 			int unset __maybe_unused)
 {
 	int ret = -ENOENT;
 	char *tmp;

 	if  (str) {
 		if (!strcmp(opt->long_name, "exec"))
 			params.uprobes = true;
 #ifdef HAVE_DWARF_SUPPORT
 		else if (!strcmp(opt->long_name, "module"))
 			params.uprobes = false;
 #endif
 		else
 			return ret;

 		/* Expand given path to absolute path, except for modulename */
 		if (params.uprobes || strchr(str, '/')) {
 			tmp = realpath(str, NULL);
 			if (!tmp) {
 				pr_warning("Failed to get the absolute path of %s: %m\n", str);
 				return ret;
 			}
 		} else {
 			tmp = strdup(str);
 			if (!tmp)
 				return -ENOMEM;
 		}
 		free(params.target);
 		params.target = tmp;
 		params.target_used = false;
 		ret = 0;
 	}

 	return ret;
 }

 /* Command option callbacks */

 #ifdef HAVE_DWARF_SUPPORT
 static int opt_show_lines(const struct option *opt,
 			  const char *str, int unset __maybe_unused)
 {
 	int ret = 0;

 	if (!str)
 		return 0;

 	if (params.command == 'L') {
 		pr_warning("Warning: more than one --line options are"
 			   " detected. Only the first one is valid.\n");
 		return 0;
 	}

 	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,
 			 const char *str, int unset __maybe_unused)
 {
 	struct perf_probe_event *pev = &params.events[params.nevents];
 	int ret;

 	if (!str)
 		return 0;

 	ret = parse_probe_event(str);
 	if (!ret && pev->nargs != 0) {
 		pr_err("  Error: '--vars' doesn't accept arguments.\n");
 		return -EINVAL;
 	}
 	params.command = opt->short_name;

 	return ret;
 }
 #endif
 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.command = opt->short_name;

 	if (str)
 		return params_add_filter(str);

 	return 0;
 }

 static int opt_set_filter(const struct option *opt __maybe_unused,
 			  const char *str, int unset __maybe_unused)
 {
 	if (str)
 		return params_add_filter(str);

 	return 0;
 }

 static int init_params(void)
 {
 	return line_range__init(&params.line_range);
 }

 static void cleanup_params(void)
 {
 	int i;

 	for (i = 0; i < params.nevents; i++)
 		clear_perf_probe_event(params.events + i);
 	line_range__clear(&params.line_range);
 	free(params.target);
 	if (params.filter)
 		strfilter__delete(params.filter);
 	memset(&params, 0, sizeof(params));
 }

 static void pr_err_with_code(const char *msg, int err)
 {
 	char sbuf[STRERR_BUFSIZE];

 	pr_err("%s", msg);
 	pr_debug(" Reason: %s (Code: %d)",
 		 strerror_r(-err, sbuf, sizeof(sbuf)), err);
 	pr_err("\n");
 }

 static int
 __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	const char * const probe_usage[] = {
 		"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
 		"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
 		"perf probe [<options>] --del '[GROUP:]EVENT' ...",
 		"perf probe --list [GROUP:]EVENT ...",
 #ifdef HAVE_DWARF_SUPPORT
 		"perf probe [<options>] --line 'LINEDESC'",
 		"perf probe [<options>] --vars 'PROBEPOINT'",
 #endif
 		"perf probe [<options>] --funcs",
 		NULL
 	};
 	struct option options[] = {
 	OPT_INCR('v', "verbose", &verbose,
 		    "be more verbose (show parsed arguments, etc)"),
 	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_set_filter_with_command, DEFAULT_LIST_FILTER),
 	OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a 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"
 		" [[NAME=]ARG ...]",
 #else
 		"[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]",
 #endif
 		"probe point definition, where\n"
 		"\t\tGROUP:\tGroup name (optional)\n"
 		"\t\tEVENT:\tEvent name\n"
 		"\t\tFUNC:\tFunction name\n"
 		"\t\tOFF:\tOffset from function entry (in byte)\n"
 		"\t\t%return:\tPut the probe at function return\n"
 #ifdef HAVE_DWARF_SUPPORT
 		"\t\tSRC:\tSource code path\n"
 		"\t\tRL:\tRelative line number from function entry.\n"
 		"\t\tAL:\tAbsolute line number in file.\n"
 		"\t\tPT:\tLazy expression of line code.\n"
 		"\t\tARG:\tProbe argument (local variable name or\n"
 		"\t\t\tkprobe-tracer argument format.)\n",
 #else
 		"\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
 #endif
 		opt_add_probe_event),
 	OPT_BOOLEAN('f', "force", &probe_conf.force_add, "forcibly add events"
 		    " with existing name"),
 #ifdef HAVE_DWARF_SUPPORT
 	OPT_CALLBACK('L', "line", NULL,
 		     "FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
 		     "Show source code lines.", opt_show_lines),
 	OPT_CALLBACK('V', "vars", NULL,
 		     "FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
 		     "Show accessible variables on PROBEDEF", opt_show_vars),
 	OPT_BOOLEAN('\0', "externs", &probe_conf.show_ext_vars,
 		    "Show external variables too (with --vars only)"),
 	OPT_BOOLEAN('\0', "range", &probe_conf.show_location_range,
 		"Show variables location range in scope (with --vars only)"),
 	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
 		   "file", "vmlinux pathname"),
 	OPT_STRING('s', "source", &symbol_conf.source_prefix,
 		   "directory", "path to kernel source"),
 	OPT_CALLBACK('m', "module", NULL, "modname|path",
 		"target module name (for online) or path (for offline)",
 		opt_set_target),
 	OPT_BOOLEAN('\0', "no-inlines", &probe_conf.no_inlines,
 		"Don't search inlined functions"),
 #endif
 	OPT__DRY_RUN(&probe_event_dry_run),
 	OPT_INTEGER('\0', "max-probes", &probe_conf.max_probes,
 		 "Set how many probe points can be found for a probe."),
 	OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
 			     "Show potential probe-able functions.",
 			     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"
 		     "\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
 		     opt_set_filter),
 	OPT_CALLBACK('x', "exec", NULL, "executable|path",
 			"target executable name or path", opt_set_target),
 	OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
 		    "Enable symbol demangling"),
 	OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
 		    "Enable kernel symbol demangling"),
 	OPT_END()
 	};
 	int ret;

 	set_option_flag(options, 'a', "add", PARSE_OPT_EXCLUSIVE);
 	set_option_flag(options, 'd', "del", PARSE_OPT_EXCLUSIVE);
 	set_option_flag(options, 'l', "list", PARSE_OPT_EXCLUSIVE);
 #ifdef HAVE_DWARF_SUPPORT
 	set_option_flag(options, 'L', "line", PARSE_OPT_EXCLUSIVE);
 	set_option_flag(options, 'V', "vars", PARSE_OPT_EXCLUSIVE);
 #endif
 	set_option_flag(options, 'F', "funcs", PARSE_OPT_EXCLUSIVE);

 	argc = parse_options(argc, argv, options, probe_usage,
 			     PARSE_OPT_STOP_AT_NON_OPTION);
 	if (argc > 0) {
 		if (strcmp(argv[0], "-") == 0) {
 			pr_warning("  Error: '-' is not supported.\n");
 			usage_with_options(probe_usage, options);
 		}
 		if (params.command && params.command != 'a') {
 			pr_warning("  Error: another command except --add is set.\n");
 			usage_with_options(probe_usage, options);
 		}
 		ret = parse_probe_event_argv(argc, argv);
 		if (ret < 0) {
 			pr_err_with_code("  Error: Command Parse Error.", ret);
 			return ret;
 		}
 		params.command = 'a';
 	}

 	if (params.quiet) {
 		if (verbose != 0) {
 			pr_err("  Error: -v and -q are exclusive.\n");
 			return -EINVAL;
 		}
 		verbose = -1;
 	}

 	if (probe_conf.max_probes == 0)
 		probe_conf.max_probes = MAX_PROBES;

 	/*
 	 * Only consider the user's kernel image path if given.
 	 */
 	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);

 	switch (params.command) {
 	case 'l':
 		if (params.uprobes) {
 			pr_warning("  Error: Don't use --list with --exec.\n");
 			usage_with_options(probe_usage, options);
 		}
 		ret = show_perf_probe_events(params.filter);
 		if (ret < 0)
 			pr_err_with_code("  Error: Failed to show event list.", ret);
 		return ret;
 	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
 	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;
 	case 'V':
 		if (!params.filter)
 			params.filter = strfilter__new(DEFAULT_VAR_FILTER,
 						       NULL);

 		ret = show_available_vars(params.events, params.nevents,
 					  params.filter);
 		if (ret < 0)
 			pr_err_with_code("  Error: Failed to show vars.", ret);
 		return ret;
 #endif
 	case 'd':
 		ret = del_perf_probe_events(params.filter);
 		if (ret < 0) {
 			pr_err_with_code("  Error: Failed to delete events.", ret);
 			return ret;
 		}
 		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");
 			usage_with_options(probe_usage, options);
 		}

 		ret = add_perf_probe_events(params.events, params.nevents);
 		if (ret < 0) {
 			pr_err_with_code("  Error: Failed to add events.", ret);
 			return ret;
 		}
 		break;
 	default:
 		usage_with_options(probe_usage, options);
 	}
 	return 0;
 }

 int cmd_probe(int argc, const char **argv, const char *prefix)
 {
 	int ret;

 	ret = init_params();
 	if (!ret) {
 		ret = __cmd_probe(argc, argv, prefix);
 		cleanup_params();
 	}

 	return ret < 0 ? ret : 0;
 }
	/*
	* builtin-probe.c
	*
	* Builtin probe command: Set up probe events by C expression
	*
	* Written by Masami Hiramatsu <mhiramat@redhat.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*
	*/
	#include <sys/utsname.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <fcntl.h>
	#include <errno.h>
	#include <stdio.h>
	#include <unistd.h>
	#include <stdlib.h>
	#include <string.h>

	#include "perf.h"
	#include "builtin.h"
	#include "util/util.h"
	#include "util/strlist.h"
	#include "util/strfilter.h"
	#include "util/symbol.h"
	#include "util/debug.h"
	#include <api/fs/debugfs.h>
	#include "util/parse-options.h"
	#include "util/probe-finder.h"
	#include "util/probe-event.h"

	#define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
	#define DEFAULT_FUNC_FILTER "!_*"
	#define DEFAULT_LIST_FILTER ":"

	/* Session management structure */
	static struct {
	int command; /* Command short_name */
	bool list_events;
	bool uprobes;
	bool quiet;
	bool target_used;
	int nevents;
	struct perf_probe_event events[MAX_PROBES];
	struct line_range line_range;
	char *target;
	struct strfilter *filter;
	} params;

	/* Parse an event definition. Note that any error must die. */
	static int parse_probe_event(const char *str)
	{
	struct perf_probe_event *pev = &params.events[params.nevents];
	int ret;

	pr_debug("probe-definition(%d): %s\n", params.nevents, str);
	if (++params.nevents == MAX_PROBES) {
	pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
	return -1;
	}

	pev->uprobes = params.uprobes;
	if (params.target) {
	pev->target = strdup(params.target);
	if (!pev->target)
	return -ENOMEM;
	params.target_used = true;
	}

	/* Parse a perf-probe command into event */
	ret = parse_perf_probe_command(str, pev);
	pr_debug("%d arguments\n", pev->nargs);

	return ret;
	}

	static int params_add_filter(const char *str)
	{
	const char *err = NULL;
	int ret = 0;

	pr_debug2("Add filter: %s\n", str);
	if (!params.filter) {
	params.filter = strfilter__new(str, &err);
	if (!params.filter)
	ret = err ? -EINVAL : -ENOMEM;
	} else
	ret = strfilter__or(params.filter, str, &err);

	if (ret == -EINVAL) {
	pr_err("Filter parse error at %td.\n", err - str + 1);
	pr_err("Source: \"%s\"\n", str);
	pr_err(" %*c\n", (int)(err - str + 1), '^');
	}

	return ret;
	}

	static int set_target(const char *ptr)
	{
	int found = 0;
	const char *buf;

	/*
	* The first argument after options can be an absolute path
	* to an executable / library or kernel module.
	*
	* TODO: Support relative path, and $PATH, $LD_LIBRARY_PATH,
	* short module name.
	*/
	if (!params.target && ptr && *ptr == '/') {
	params.target = strdup(ptr);
	if (!params.target)
	return -ENOMEM;
	params.target_used = false;

	found = 1;
	buf = ptr + (strlen(ptr) - 3);

	if (strcmp(buf, ".ko"))
	params.uprobes = true;

	}

	return found;
	}

	static int parse_probe_event_argv(int argc, const char **argv)
	{
	int i, len, ret, found_target;
	char *buf;

	found_target = set_target(argv[0]);
	if (found_target < 0)
	return found_target;

	if (found_target && argc == 1)
	return 0;

	/* Bind up rest arguments */
	len = 0;
	for (i = 0; i < argc; i++) {
	if (i == 0 && found_target)
	continue;

	len += strlen(argv[i]) + 1;
	}
	buf = zalloc(len + 1);
	if (buf == NULL)
	return -ENOMEM;
	len = 0;
	for (i = 0; i < argc; i++) {
	if (i == 0 && found_target)
	continue;

	len += sprintf(&buf[len], "%s ", argv[i]);
	}
	ret = parse_probe_event(buf);
	free(buf);
	return ret;
	}

	static int opt_set_target(const struct option opt, const char str,
	int unset __maybe_unused)
	{
	int ret = -ENOENT;
	char *tmp;

	if (str) {
	if (!strcmp(opt->long_name, "exec"))
	params.uprobes = true;
	#ifdef HAVE_DWARF_SUPPORT
	else if (!strcmp(opt->long_name, "module"))
	params.uprobes = false;
	#endif
	else
	return ret;

	/* Expand given path to absolute path, except for modulename */
	if (params.uprobes \|\| strchr(str, '/')) {
	tmp = realpath(str, NULL);
	if (!tmp) {
	pr_warning("Failed to get the absolute path of %s: %m\n", str);
	return ret;
	}
	} else {
	tmp = strdup(str);
	if (!tmp)
	return -ENOMEM;
	}
	free(params.target);
	params.target = tmp;
	params.target_used = false;
	ret = 0;
	}

	return ret;
	}

	/* Command option callbacks */

	#ifdef HAVE_DWARF_SUPPORT
	static int opt_show_lines(const struct option *opt,
	const char *str, int unset __maybe_unused)
	{
	int ret = 0;

	if (!str)
	return 0;

	if (params.command == 'L') {
	pr_warning("Warning: more than one --line options are"
	" detected. Only the first one is valid.\n");
	return 0;
	}

	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,
	const char *str, int unset __maybe_unused)
	{
	struct perf_probe_event *pev = &params.events[params.nevents];
	int ret;

	if (!str)
	return 0;

	ret = parse_probe_event(str);
	if (!ret && pev->nargs != 0) {
	pr_err(" Error: '--vars' doesn't accept arguments.\n");
	return -EINVAL;
	}
	params.command = opt->short_name;

	return ret;
	}
	#endif
	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.command = opt->short_name;

	if (str)
	return params_add_filter(str);

	return 0;
	}

	static int opt_set_filter(const struct option *opt __maybe_unused,
	const char *str, int unset __maybe_unused)
	{
	if (str)
	return params_add_filter(str);

	return 0;
	}

	static int init_params(void)
	{
	return line_range__init(&params.line_range);
	}

	static void cleanup_params(void)
	{
	int i;

	for (i = 0; i < params.nevents; i++)
	clear_perf_probe_event(params.events + i);
	line_range__clear(&params.line_range);
	free(params.target);
	if (params.filter)
	strfilter__delete(params.filter);
	memset(&params, 0, sizeof(params));
	}

	static void pr_err_with_code(const char *msg, int err)
	{
	char sbuf[STRERR_BUFSIZE];

	pr_err("%s", msg);
	pr_debug(" Reason: %s (Code: %d)",
	strerror_r(-err, sbuf, sizeof(sbuf)), err);
	pr_err("\n");
	}

	static int
	__cmd_probe(int argc, const char *argv, const char prefix __maybe_unused)
	{
	const char * const probe_usage[] = {
	"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
	"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
	"perf probe [<options>] --del '[GROUP:]EVENT' ...",
	"perf probe --list [GROUP:]EVENT ...",
	#ifdef HAVE_DWARF_SUPPORT
	"perf probe [<options>] --line 'LINEDESC'",
	"perf probe [<options>] --vars 'PROBEPOINT'",
	#endif
	"perf probe [<options>] --funcs",
	NULL
	};
	struct option options[] = {
	OPT_INCR('v', "verbose", &verbose,
	"be more verbose (show parsed arguments, etc)"),
	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_set_filter_with_command, DEFAULT_LIST_FILTER),
	OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a 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"
	" [[NAME=]ARG ...]",
	#else
	"[EVENT=]FUNC[+OFF\|%return] [[NAME=]ARG ...]",
	#endif
	"probe point definition, where\n"
	"\t\tGROUP:\tGroup name (optional)\n"
	"\t\tEVENT:\tEvent name\n"
	"\t\tFUNC:\tFunction name\n"
	"\t\tOFF:\tOffset from function entry (in byte)\n"
	"\t\t%return:\tPut the probe at function return\n"
	#ifdef HAVE_DWARF_SUPPORT
	"\t\tSRC:\tSource code path\n"
	"\t\tRL:\tRelative line number from function entry.\n"
	"\t\tAL:\tAbsolute line number in file.\n"
	"\t\tPT:\tLazy expression of line code.\n"
	"\t\tARG:\tProbe argument (local variable name or\n"
	"\t\t\tkprobe-tracer argument format.)\n",
	#else
	"\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
	#endif
	opt_add_probe_event),
	OPT_BOOLEAN('f', "force", &probe_conf.force_add, "forcibly add events"
	" with existing name"),
	#ifdef HAVE_DWARF_SUPPORT
	OPT_CALLBACK('L', "line", NULL,
	"FUNC[:RLN[+NUM\|-RLN2]]\|SRC:ALN[+NUM\|-ALN2]",
	"Show source code lines.", opt_show_lines),
	OPT_CALLBACK('V', "vars", NULL,
	"FUNC[@SRC][+OFF\|%return\|:RL\|;PT]\|SRC:AL\|SRC;PT",
	"Show accessible variables on PROBEDEF", opt_show_vars),
	OPT_BOOLEAN('\0', "externs", &probe_conf.show_ext_vars,
	"Show external variables too (with --vars only)"),
	OPT_BOOLEAN('\0', "range", &probe_conf.show_location_range,
	"Show variables location range in scope (with --vars only)"),
	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
	"file", "vmlinux pathname"),
	OPT_STRING('s', "source", &symbol_conf.source_prefix,
	"directory", "path to kernel source"),
	OPT_CALLBACK('m', "module", NULL, "modname\|path",
	"target module name (for online) or path (for offline)",
	opt_set_target),
	OPT_BOOLEAN('\0', "no-inlines", &probe_conf.no_inlines,
	"Don't search inlined functions"),
	#endif
	OPT__DRY_RUN(&probe_event_dry_run),
	OPT_INTEGER('\0', "max-probes", &probe_conf.max_probes,
	"Set how many probe points can be found for a probe."),
	OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
	"Show potential probe-able functions.",
	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"
	"\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
	opt_set_filter),
	OPT_CALLBACK('x', "exec", NULL, "executable\|path",
	"target executable name or path", opt_set_target),
	OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
	"Enable symbol demangling"),
	OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
	"Enable kernel symbol demangling"),
	OPT_END()
	};
	int ret;

	set_option_flag(options, 'a', "add", PARSE_OPT_EXCLUSIVE);
	set_option_flag(options, 'd', "del", PARSE_OPT_EXCLUSIVE);
	set_option_flag(options, 'l', "list", PARSE_OPT_EXCLUSIVE);
	#ifdef HAVE_DWARF_SUPPORT
	set_option_flag(options, 'L', "line", PARSE_OPT_EXCLUSIVE);
	set_option_flag(options, 'V', "vars", PARSE_OPT_EXCLUSIVE);
	#endif
	set_option_flag(options, 'F', "funcs", PARSE_OPT_EXCLUSIVE);

	argc = parse_options(argc, argv, options, probe_usage,
	PARSE_OPT_STOP_AT_NON_OPTION);
	if (argc > 0) {
	if (strcmp(argv[0], "-") == 0) {
	pr_warning(" Error: '-' is not supported.\n");
	usage_with_options(probe_usage, options);
	}
	if (params.command && params.command != 'a') {
	pr_warning(" Error: another command except --add is set.\n");
	usage_with_options(probe_usage, options);
	}
	ret = parse_probe_event_argv(argc, argv);
	if (ret < 0) {
	pr_err_with_code(" Error: Command Parse Error.", ret);
	return ret;
	}
	params.command = 'a';
	}

	if (params.quiet) {
	if (verbose != 0) {
	pr_err(" Error: -v and -q are exclusive.\n");
	return -EINVAL;
	}
	verbose = -1;
	}

	if (probe_conf.max_probes == 0)
	probe_conf.max_probes = MAX_PROBES;

	/*
	* Only consider the user's kernel image path if given.
	*/
	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);

	switch (params.command) {
	case 'l':
	if (params.uprobes) {
	pr_warning(" Error: Don't use --list with --exec.\n");
	usage_with_options(probe_usage, options);
	}
	ret = show_perf_probe_events(params.filter);
	if (ret < 0)
	pr_err_with_code(" Error: Failed to show event list.", ret);
	return ret;
	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
	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;
	case 'V':
	if (!params.filter)
	params.filter = strfilter__new(DEFAULT_VAR_FILTER,
	NULL);

	ret = show_available_vars(params.events, params.nevents,
	params.filter);
	if (ret < 0)
	pr_err_with_code(" Error: Failed to show vars.", ret);
	return ret;
	#endif
	case 'd':
	ret = del_perf_probe_events(params.filter);
	if (ret < 0) {
	pr_err_with_code(" Error: Failed to delete events.", ret);
	return ret;
	}
	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");
	usage_with_options(probe_usage, options);
	}

	ret = add_perf_probe_events(params.events, params.nevents);
	if (ret < 0) {
	pr_err_with_code(" Error: Failed to add events.", ret);
	return ret;
	}
	break;
	default:
	usage_with_options(probe_usage, options);
	}
	return 0;
	}

	int cmd_probe(int argc, const char *argv, const char prefix)
	{
	int ret;

	ret = init_params();
	if (!ret) {
	ret = __cmd_probe(argc, argv, prefix);
	cleanup_params();
	}

	return ret < 0 ? ret : 0;
	}