// SPDX-License-Identifier: GPL-2.0

  /*
   * Builtin evlist command: Show the list of event selectors present
   * in a perf.data file.
   */
  #include "builtin.h"

  #include <linux/list.h>
  
  #include "perf.h"
  #include "util/evlist.h"
  #include "util/evsel.h"

  #include "util/evsel_fprintf.h"

  #include "util/parse-events.h"

  #include <subcmd/parse-options.h>

  #include "util/session.h"

  #include "util/data.h"

  #include "util/debug.h"

  #include <linux/err.h>

  static int __cmd_evlist(const char *file_name, struct perf_attr_details *details)

  {
  	struct perf_session *session;

  	struct evsel *pos;

  	struct perf_data data = {

  		.path      = file_name,

  		.mode      = PERF_DATA_MODE_READ,
  		.force     = details->force,

  	};

  	bool has_tracepoint = false;

  	session = perf_session__new(&data, 0, NULL);

  	if (IS_ERR(session))
  		return PTR_ERR(session);

  	evlist__for_each_entry(session->evlist, pos) {

  		evsel__fprintf(pos, details, stdout);

  		if (pos->core.attr.type == PERF_TYPE_TRACEPOINT)

  			has_tracepoint = true;
  	}
  
  	if (has_tracepoint && !details->trace_fields)
  		printf("# Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events
  ");

  	perf_session__delete(session);
  	return 0;
  }

  int cmd_evlist(int argc, const char **argv)

  {

  	struct perf_attr_details details = { .verbose = false, };

  	const struct option options[] = {

  	OPT_STRING('i', "input", &input_name, "file", "Input file name"),
  	OPT_BOOLEAN('F', "freq", &details.freq, "Show the sample frequency"),
  	OPT_BOOLEAN('v', "verbose", &details.verbose,
  		    "Show all event attr details"),

  	OPT_BOOLEAN('g', "group", &details.event_group,

  		    "Show event group information"),

  	OPT_BOOLEAN('f', "force", &details.force, "don't complain, do it"),

  	OPT_BOOLEAN(0, "trace-fields", &details.trace_fields, "Show tracepoint fields"),

  	OPT_END()
  	};
  	const char * const evlist_usage[] = {
  		"perf evlist [<options>]",
  		NULL

  	};

  	argc = parse_options(argc, argv, options, evlist_usage, 0);
  	if (argc)
  		usage_with_options(evlist_usage, options);

  	if (details.event_group && (details.verbose || details.freq)) {

  		usage_with_options_msg(evlist_usage, options,
  			"--group option is not compatible with other options
  ");

  	}

  	return __cmd_evlist(input_name, &details);

  }