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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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15
json_object.h
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@@ -500,10 +500,16 @@ JSON_EXPORT void json_object_object_del(struct json_object *obj, const char *key
/* Array type methods */
/** Create a new empty json_object of type json_type_array
* If you know the array size you'll need ahead of time, use
* json_object_new_array_ext() instead.
* @see json_object_new_array_ext()
* @see json_object_array_shrink()
* @returns a json_object of type json_type_array
*/
JSON_EXPORT struct json_object *json_object_new_array(void);
JSON_EXPORT struct json_object *json_object_new_array_ext(int initial_size);
/** Get the arraylist of a json_object of type json_type_array
* @param obj the json_object instance
* @returns an arraylist
@@ -595,6 +601,15 @@ JSON_EXPORT struct json_object *json_object_array_get_idx(const struct json_obje
*/
JSON_EXPORT int json_object_array_del_idx(struct json_object *obj, size_t idx, size_t count);
/**
* Shrink the internal memory allocation of the array to just
* enough to fit the number of elements in it, plus empty_slots.
*
* @param jso the json_object instance, must be json_type_array
* @param empty_slots the number of empty slots to leave allocated
*/
JSON_EXPORT int json_object_array_shrink(struct json_object *jso, int empty_slots);
/* json_bool type methods */
/** Create a new empty json_object of type json_type_boolean