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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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6
json_tokener.c
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@@ -964,6 +964,9 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
case json_tokener_state_array:
if (c == ']')
{
// Minimize memory usage; assume parsed objs are unlikely to be changed
json_object_array_shrink(current, 0);
if (state == json_tokener_state_array_after_sep &&
(tok->flags & JSON_TOKENER_STRICT))
{
@@ -997,6 +1000,9 @@ struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *
case json_tokener_state_array_sep:
if (c == ']')
{
// Minimize memory usage; assume parsed objs are unlikely to be changed
json_object_array_shrink(current, 0);
saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws;
}