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Change array length into a virtual property. (#1439)

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This change allows easier access to array length which improves
the performance of inserting new items into an array and there
is no need to allocate length strings anymore. The trade-of is
that array length cannot be cached anymore.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2016-11-22 13:29:53 +01:00
committed by GitHub
parent 4a0f78bc4b
commit 132477f7d5
8 changed files with 236 additions and 152 deletions
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jerry-core/vm/vm.c
+3 -7
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@@ -1000,19 +1000,15 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
case VM_OC_APPEND_ARRAY:
{
ecma_object_t *array_obj_p;
ecma_string_t length_str;
ecma_property_value_t *length_prop_value_p;
uint32_t length_num;
uint32_t values_length = *byte_code_p++;
stack_top_p -= values_length;
array_obj_p = ecma_get_object_from_value (stack_top_p[-1]);
ecma_init_ecma_length_string (&length_str);
length_prop_value_p = ecma_get_named_data_property (array_obj_p, &length_str);
ecma_extended_object_t *ext_array_obj_p = (ecma_extended_object_t *) array_obj_p;
left_value = length_prop_value_p->value;
length_num = ecma_get_uint32_from_value (left_value);
length_num = ext_array_obj_p->u.array.length;
for (uint32_t i = 0; i < values_length; i++)
{
@@ -1041,7 +1037,7 @@ vm_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
length_num++;
}
ecma_value_assign_uint32 (&length_prop_value_p->value, length_num);
ext_array_obj_p->u.array.length = length_num;
continue;
}
case VM_OC_PUSH_UNDEFINED_BASE: