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Add json_object_array_shrink() (and array_list_shrink()) and use it in json_tokener to minimize the amount of memory used. This results in a 39%-50% reduction in memory use (peak RSS, peak heap usage) on the jc-bench benchmark and 9% shorter runtime.

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Also add the json_object_new_array_ext, array_list_new2, and array_list_shrink functions.
This commit is contained in:
Eric Haszlakiewicz
2020-06-20 18:03:04 +00:00
parent 99bb2121c6
commit e26a1195f4
6 changed files with 95 additions and 3 deletions
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13
json_object.c
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@@ -1431,11 +1431,15 @@ static void json_object_array_delete(struct json_object *jso)
}
struct json_object *json_object_new_array(void)
{
return json_object_new_array_ext(ARRAY_LIST_DEFAULT_SIZE);
}
struct json_object *json_object_new_array_ext(int initial_size)
{
struct json_object_array *jso = JSON_OBJECT_NEW(array);
if (!jso)
return NULL;
jso->c_array = array_list_new(&json_object_array_entry_free);
jso->c_array = array_list_new2(&json_object_array_entry_free, initial_size);
if (jso->c_array == NULL)
{
free(jso);
@@ -1523,6 +1527,13 @@ static int json_array_equal(struct json_object *jso1, struct json_object *jso2)
return 1;
}
int json_object_array_shrink(struct json_object *jso, int empty_slots)
{
if (empty_slots < 0)
json_abort("json_object_array_shrink called with negative empty_slots");
return array_list_shrink(JC_ARRAY(jso)->c_array, empty_slots);
}
struct json_object *json_object_new_null(void)
{
return NULL;