[PATCH v2 5/9] perf tools: avoid a malloc for array events

[Ian Rogers]

Use realloc rather than malloc+memcpy to possibly avoid a memory
allocation when appending array elements.

Signed-off-by: Ian Rogers <irog...@google.com>
---
 tools/perf/util/parse-events.y | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 26cb65798522..545ab7cefc20 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -691,14 +691,12 @@ array_terms ',' array_term
        struct parse_events_array new_array;
 
        new_array.nr_ranges = $1.nr_ranges + $3.nr_ranges;
-       new_array.ranges = malloc(sizeof(new_array.ranges[0]) *
-                                 new_array.nr_ranges);
+       new_array.ranges = realloc($1.ranges,
+                               sizeof(new_array.ranges[0]) *
+                               new_array.nr_ranges);
        ABORT_ON(!new_array.ranges);
-       memcpy(&new_array.ranges[0], $1.ranges,
-              $1.nr_ranges * sizeof(new_array.ranges[0]));
        memcpy(&new_array.ranges[$1.nr_ranges], $3.ranges,
               $3.nr_ranges * sizeof(new_array.ranges[0]));
-       free($1.ranges);
        free($3.ranges);
        $$ = new_array;
 }
-- 
2.23.0.866.gb869b98d4c-goog