perf list: Simplify symbol event printing

The current code computes an array of symbol names then sorts and prints
them. Use a strlist to create a list of names that is sorted and then
print it.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Weilin Wang <weilin.wang@intel.com>
Cc: Xin Gao <gaoxin@cdjrlc.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: http://lore.kernel.org/lkml/20221114210723.2749751-8-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/print-events.c b/tools/perf/util/print-events.c
index ff77939..d53dba0 100644 (file)
--- a/tools/perf/util/print-events.c
+++ b/tools/perf/util/print-events.c
@@ -52,14 +52,6 @@ static const struct event_symbol event_symbols_tool[PERF_TOOL_MAX] = {
        },
 };
 
-static int cmp_string(const void *a, const void *b)
-{
-       const char * const *as = a;
-       const char * const *bs = b;
-
-       return strcmp(*as, *bs);
-}
-
 /*
  * Print the events from <debugfs_mount_point>/tracing/events
  */
@@ -298,77 +290,48 @@ void print_symbol_events(const char *event_glob, unsigned int type,
                         struct event_symbol *syms, unsigned int max,
                         bool name_only)
 {
-       unsigned int i, evt_i = 0, evt_num = 0;
-       char name[MAX_NAME_LEN];
-       char **evt_list = NULL;
-       bool evt_num_known = false;
-
-restart:
-       if (evt_num_known) {
-               evt_list = zalloc(sizeof(char *) * evt_num);
-               if (!evt_list)
-                       goto out_enomem;
-               syms -= max;
-       }
+       struct strlist *evt_name_list = strlist__new(NULL, NULL);
+       struct str_node *nd;
 
-       for (i = 0; i < max; i++, syms++) {
+       if (!evt_name_list) {
+               pr_debug("Failed to allocate new strlist for symbol events\n");
+               return;
+       }
+       for (unsigned int i = 0; i < max; i++) {
                /*
                 * New attr.config still not supported here, the latest
                 * example was PERF_COUNT_SW_CGROUP_SWITCHES
                 */
-               if (syms->symbol == NULL)
+               if (syms[i].symbol == NULL)
                        continue;
 
-               if (event_glob != NULL && !(strglobmatch(syms->symbol, event_glob) ||
-                     (syms->alias && strglobmatch(syms->alias, event_glob))))
+               if (event_glob != NULL && !(strglobmatch(syms[i].symbol, event_glob) ||
+                     (syms[i].alias && strglobmatch(syms[i].alias, event_glob))))
                        continue;
 
                if (!is_event_supported(type, i))
                        continue;
 
-               if (!evt_num_known) {
-                       evt_num++;
-                       continue;
-               }
-
-               if (!name_only && strlen(syms->alias))
-                       snprintf(name, MAX_NAME_LEN, "%s OR %s", syms->symbol, syms->alias);
-               else
-                       strlcpy(name, syms->symbol, MAX_NAME_LEN);
+               if (strlen(syms[i].alias)) {
+                       char name[MAX_NAME_LEN];
 
-               evt_list[evt_i] = strdup(name);
-               if (evt_list[evt_i] == NULL)
-                       goto out_enomem;
-               evt_i++;
+                       snprintf(name, MAX_NAME_LEN, "%s OR %s", syms[i].symbol, syms[i].alias);
+                       strlist__add(evt_name_list, name);
+               } else
+                       strlist__add(evt_name_list, syms[i].symbol);
        }
 
-       if (!evt_num_known) {
-               evt_num_known = true;
-               goto restart;
-       }
-       qsort(evt_list, evt_num, sizeof(char *), cmp_string);
-       evt_i = 0;
-       while (evt_i < evt_num) {
+       strlist__for_each_entry(nd, evt_name_list) {
                if (name_only) {
-                       printf("%s ", evt_list[evt_i++]);
+                       printf("%s ", nd->s);
                        continue;
                }
-               printf("  %-50s [%s]\n", evt_list[evt_i++], event_type_descriptors[type]);
+               printf("  %-50s [%s]\n", nd->s, event_type_descriptors[type]);
        }
-       if (evt_num && pager_in_use())
+       if (!strlist__empty(evt_name_list) && pager_in_use())
                printf("\n");
 
-out_free:
-       evt_num = evt_i;
-       for (evt_i = 0; evt_i < evt_num; evt_i++)
-               zfree(&evt_list[evt_i]);
-       zfree(&evt_list);
-       return;
-
-out_enomem:
-       printf("FATAL: not enough memory to print %s\n", event_type_descriptors[type]);
-       if (evt_list)
-               goto out_free;
+       strlist__delete(evt_name_list);
 }
 
 /*