diff options
Diffstat (limited to 'erts/emulator/beam/erl_map.c')
| -rw-r--r-- | erts/emulator/beam/erl_map.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/erts/emulator/beam/erl_map.c b/erts/emulator/beam/erl_map.c index ea041e2303..0cf1c0e59d 100644 --- a/erts/emulator/beam/erl_map.c +++ b/erts/emulator/beam/erl_map.c @@ -422,6 +422,41 @@ static Eterm hashmap_from_validated_list(Process *p, Eterm list, Uint size) { erts_free(ERTS_ALC_T_TMP, (void *) hxns); ERTS_VERIFY_UNUSED_TEMP_ALLOC(p); + if (hashmap_size(res) <= MAP_SMALL_MAP_LIMIT) { + DECLARE_WSTACK(wstack); + Eterm *kv, *ks, *vs; + map_t *mp; + Eterm keys; + Uint n = hashmap_size(res); + + /* build flat structure */ + hp = HAlloc(p, 3 + 1 + (2 * n)); + keys = make_tuple(hp); + *hp++ = make_arityval(n); + ks = hp; + hp += n; + mp = (map_t*)hp; + hp += MAP_HEADER_SIZE; + vs = hp; + + mp->thing_word = MAP_HEADER; + mp->size = n; + mp->keys = keys; + + hashmap_iterator_init(&wstack, res); + + while ((kv=hashmap_iterator_next(&wstack)) != NULL) { + *ks++ = CAR(kv); + *vs++ = CDR(kv); + } + + /* it cannot have multiple keys */ + erts_validate_and_sort_map(mp); + + DESTROY_WSTACK(wstack); + return make_map(mp); + } + return res; } @@ -461,6 +496,7 @@ Eterm erts_hashmap_from_ks_and_vs_extra(Process *p, Eterm *ks, Eterm *vs, Uint n Eterm *hp, res; sz = (key == THE_NON_VALUE) ? n : (n + 1); + ASSERT(sz > MAP_SMALL_MAP_LIMIT); hp = HAlloc(p, 2 * sz); /* create tmp hx values and leaf ptrs */ |