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Track all NULL values in the property hashmap. (#1534)

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There are two types of NULL values in the property hashmap: deleted
entries, and never used entries. The current implementation tracks
only the never used entries, and never scales back the hashmap.
After this patch property delete can also recreate the hashmap, or
remove it entirely if there are too few items in the array.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2017-01-19 11:34:24 +01:00
committed by Tilmann Scheller
parent 6c708102d3
commit 8b5d645df6
2 changed files with 44 additions and 7 deletions
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jerry-core/ecma/base/ecma-property-hashmap.c
+18 -7
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@@ -300,13 +300,8 @@ ecma_property_hashmap_insert (ecma_object_t *object_p, /**< object */
bits_p += (entry_index >> 3);
mask = (uint32_t) (1 << (entry_index & 0x7));
if (!(*bits_p & mask))
{
/* Deleted entries also has ECMA_NULL_POINTER
* value, but they are not NULL values. */
hashmap_p->null_count--;
JERRY_ASSERT (hashmap_p->null_count > 0);
}
hashmap_p->null_count--;
JERRY_ASSERT (hashmap_p->null_count > 0);
if (property_index == 0)
{
@@ -338,6 +333,22 @@ ecma_property_hashmap_delete (ecma_object_t *object_p, /**< object */
JERRY_ASSERT (hashmap_p->header.types[0] == ECMA_PROPERTY_TYPE_HASHMAP);
hashmap_p->null_count++;
/* The NULLs are above 3/4 of the hashmap. */
if (hashmap_p->null_count > ((hashmap_p->max_property_count * 3) >> 2))
{
uint32_t max_property_count = hashmap_p->max_property_count;
ecma_property_hashmap_free (object_p);
if (max_property_count >= ECMA_PROPERTY_HASMAP_MINIMUM_SIZE * 2)
{
ecma_property_hashmap_create (object_p);
}
return;
}
uint32_t entry_index = ecma_string_get_property_name_hash (*property_p, name_cp);
uint32_t step = ecma_property_hashmap_steps[entry_index & (ECMA_PROPERTY_HASHMAP_NUMBER_OF_STEPS - 1)];
uint32_t mask = hashmap_p->max_property_count - 1;