/**
* [[DefineOwnProperty]] ecma array object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
* ECMA-262 v5, 15.4.5.1
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value
*/
ecma_completion_value_t
ecma_op_array_object_define_own_property (ecma_object_t *obj_p, /**< the array object */
ecma_string_t *property_name_p, /**< property name */
const ecma_property_descriptor_t *property_desc_p, /**< property descriptor */
bool is_throw) /**< flag that controls failure handling */
{
JERRY_ASSERT (ecma_get_object_type (obj_p) == ECMA_OBJECT_TYPE_ARRAY);
// 1.
ecma_string_t *magic_string_length_p = ecma_get_magic_string (LIT_MAGIC_STRING_LENGTH);
ecma_property_t *len_prop_p = ecma_op_object_get_own_property (obj_p, magic_string_length_p);
JERRY_ASSERT (len_prop_p != NULL && len_prop_p->type == ECMA_PROPERTY_NAMEDDATA);
// 2.
ecma_value_t old_len_value = ecma_get_named_data_property_value (len_prop_p);
ecma_number_t *num_p = ecma_get_number_from_value (old_len_value);
uint32_t old_len_uint32 = ecma_number_to_uint32 (*num_p);
// 3.
bool is_property_name_equal_length = ecma_compare_ecma_strings (property_name_p,
magic_string_length_p);
ecma_deref_ecma_string (magic_string_length_p);
if (is_property_name_equal_length)
{
// a.
if (!property_desc_p->is_value_defined)
{
// i.
return ecma_op_general_object_define_own_property (obj_p, property_name_p, property_desc_p, is_throw);
}
ecma_number_t new_len_num;
// c.
ecma_completion_value_t completion = ecma_op_to_number (property_desc_p->value);
if (ecma_is_completion_value_throw (completion))
{
return completion;
}
JERRY_ASSERT (ecma_is_completion_value_normal (completion)
&& ecma_is_value_number (ecma_get_completion_value_value (completion)));
new_len_num = *ecma_get_number_from_completion_value (completion);
ecma_free_completion_value (completion);
uint32_t new_len_uint32 = ecma_number_to_uint32 (new_len_num);
// d.
if (ecma_uint32_to_number (new_len_uint32) != new_len_num)
{
return ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_RANGE));
}
else
{
// b., e.
ecma_number_t *new_len_num_p = ecma_alloc_number ();
*new_len_num_p = new_len_num;
ecma_property_descriptor_t new_len_property_desc = *property_desc_p;
new_len_property_desc.value = ecma_make_number_value (new_len_num_p);
ecma_completion_value_t ret_value = ecma_make_empty_completion_value ();
// f.
if (new_len_uint32 >= old_len_uint32)
{
// i.
magic_string_length_p = ecma_get_magic_string (LIT_MAGIC_STRING_LENGTH);
ret_value = ecma_op_general_object_define_own_property (obj_p,
magic_string_length_p,
&new_len_property_desc,
is_throw);
ecma_deref_ecma_string (magic_string_length_p);
}
else
{
// g.
if (!ecma_is_property_writable (len_prop_p))
{
ret_value = ecma_reject (is_throw);
}
else
{
// h.
bool new_writable;
if (!new_len_property_desc.is_writable_defined
|| new_len_property_desc.is_writable)
{
new_writable = true;
}
else
{
// ii.
new_writable = false;
// iii.
new_len_property_desc.is_writable_defined = true;
new_len_property_desc.is_writable = true;
}
// j.
magic_string_length_p = ecma_get_magic_string (LIT_MAGIC_STRING_LENGTH);
ecma_completion_value_t succeeded = ecma_op_general_object_define_own_property (obj_p,
magic_string_length_p,
&new_len_property_desc,
is_throw);
ecma_deref_ecma_string (magic_string_length_p);
/* Handling normal false and throw values */
if (!ecma_is_completion_value_normal_true (succeeded))
{
JERRY_ASSERT (ecma_is_completion_value_normal_false (succeeded)
|| ecma_is_completion_value_throw (succeeded));
// k.
ret_value = succeeded;
}
else
{
// l
JERRY_ASSERT (new_len_uint32 < old_len_uint32);
/*
* Item i. is replaced with faster iteration: only indices that actually exist in the array, are iterated
*/
bool is_reduce_succeeded = true;
ecma_collection_header_t *array_index_props_p = ecma_op_object_get_property_names (obj_p,
true,
false,
false);
ecma_length_t array_index_props_num = array_index_props_p->unit_number;
MEM_DEFINE_LOCAL_ARRAY (array_index_values_p, array_index_props_num, uint32_t);
ecma_collection_iterator_t iter;
ecma_collection_iterator_init (&iter, array_index_props_p);
uint32_t array_index_values_pos = 0;
while (ecma_collection_iterator_next (&iter))
{
ecma_string_t *property_name_p = ecma_get_string_from_value (*iter.current_value_p);
uint32_t index;
bool is_index = ecma_string_get_array_index (property_name_p, &index);
JERRY_ASSERT (is_index);
JERRY_ASSERT (index < old_len_uint32);
array_index_values_p[array_index_values_pos++] = index;
}
JERRY_ASSERT (array_index_values_pos == array_index_props_num);
while (array_index_values_pos != 0
&& array_index_values_p[--array_index_values_pos] >= new_len_uint32)
{
uint32_t index = array_index_values_p[array_index_values_pos];
// ii.
ecma_string_t *index_string_p = ecma_new_ecma_string_from_uint32 (index);
ecma_completion_value_t delete_succeeded = ecma_op_object_delete (obj_p,
index_string_p,
false);
ecma_deref_ecma_string (index_string_p);
if (ecma_is_completion_value_normal_false (delete_succeeded))
{
// iii.
new_len_uint32 = (index + 1u);
ecma_number_t *new_len_num_p = ecma_get_number_from_value (new_len_property_desc.value);
// 1.
*new_len_num_p = ecma_uint32_to_number (index + 1u);
// 2.
if (!new_writable)
{
new_len_property_desc.is_writable_defined = true;
new_len_property_desc.is_writable = false;
}
// 3.
ecma_string_t *magic_string_length_p = ecma_get_magic_string (LIT_MAGIC_STRING_LENGTH);
ecma_completion_value_t completion = ecma_op_general_object_define_own_property (obj_p,
magic_string_length_p,
&new_len_property_desc,
false);
ecma_deref_ecma_string (magic_string_length_p);
JERRY_ASSERT (ecma_is_completion_value_normal_true (completion)
|| ecma_is_completion_value_normal_false (completion));
is_reduce_succeeded = false;
break;
}
}
MEM_FINALIZE_LOCAL_ARRAY (array_index_values_p);
ecma_free_values_collection (array_index_props_p, true);
if (!is_reduce_succeeded)
{
ret_value = ecma_reject (is_throw);
}
else
{
// m.
if (!new_writable)
{
ecma_property_descriptor_t prop_desc_not_writable = ecma_make_empty_property_descriptor ();
prop_desc_not_writable.is_writable_defined = true;
prop_desc_not_writable.is_writable = false;
ecma_completion_value_t completion_set_not_writable;
magic_string_length_p = ecma_get_magic_string (LIT_MAGIC_STRING_LENGTH);
completion_set_not_writable = ecma_op_general_object_define_own_property (obj_p,
magic_string_length_p,
&prop_desc_not_writable,
false);
ecma_deref_ecma_string (magic_string_length_p);
JERRY_ASSERT (ecma_is_completion_value_normal_true (completion_set_not_writable));
}
ret_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE);
}
}
}
}
ecma_dealloc_number (new_len_num_p);
return ret_value;
}
JERRY_UNREACHABLE ();
}
else
{
// 4.a.
uint32_t index;
if (!ecma_string_get_array_index (property_name_p, &index))
{
// 5.
return ecma_op_general_object_define_own_property (obj_p,
property_name_p,
property_desc_p,
is_throw);
}
// 4.
// b.
if (index >= old_len_uint32
&& !ecma_is_property_writable (len_prop_p))
{
return ecma_reject (is_throw);
}
// c.
ecma_completion_value_t succeeded = ecma_op_general_object_define_own_property (obj_p,
property_name_p,
property_desc_p,
false);
// d.
JERRY_ASSERT (ecma_is_completion_value_normal_true (succeeded)
|| ecma_is_completion_value_normal_false (succeeded));
if (ecma_is_completion_value_normal_false (succeeded))
{
return ecma_reject (is_throw);
}
// e.
if (index >= old_len_uint32)
{
// i., ii.
ecma_number_t *num_p = ecma_alloc_number ();
*num_p = ecma_number_add (ecma_uint32_to_number (index), ECMA_NUMBER_ONE);
ecma_named_data_property_assign_value (obj_p, len_prop_p, ecma_make_number_value (num_p));
ecma_dealloc_number (num_p);
}
// f.
return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE);
}
JERRY_UNREACHABLE ();
} /* ecma_op_array_object_define_own_property */
/**
* [[DefineOwnProperty]] ecma array object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
* ECMA-262 v5, 15.4.5.1
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value
*/
ecma_completion_value_t
ecma_op_array_object_define_own_property (ecma_object_t *obj_p, /**< the array object */
ecma_string_t *property_name_p, /**< property name */
const ecma_property_descriptor_t* property_desc_p, /**< property descriptor */
bool is_throw) /**< flag that controls failure handling */
{
JERRY_ASSERT (ecma_get_object_type (obj_p) == ECMA_OBJECT_TYPE_ARRAY);
// 1.
ecma_string_t* magic_string_length_p = ecma_get_magic_string (LIT_MAGIC_STRING_LENGTH);
ecma_property_t *len_prop_p = ecma_op_object_get_own_property (obj_p, magic_string_length_p);
JERRY_ASSERT (len_prop_p != NULL && len_prop_p->type == ECMA_PROPERTY_NAMEDDATA);
// 2.
ecma_value_t old_len_value = ecma_get_named_data_property_value (len_prop_p);
ecma_number_t *num_p = ecma_get_number_from_value (old_len_value);
uint32_t old_len_uint32 = ecma_number_to_uint32 (*num_p);
// 3.
bool is_property_name_equal_length = ecma_compare_ecma_strings (property_name_p,
magic_string_length_p);
ecma_deref_ecma_string (magic_string_length_p);
if (is_property_name_equal_length)
{
// a.
if (!property_desc_p->is_value_defined)
{
// i.
return ecma_op_general_object_define_own_property (obj_p, property_name_p, property_desc_p, is_throw);
}
ecma_number_t new_len_num;
// c.
ecma_completion_value_t completion = ecma_op_to_number (property_desc_p->value);
if (ecma_is_completion_value_throw (completion))
{
return completion;
}
JERRY_ASSERT (ecma_is_completion_value_normal (completion)
&& ecma_is_value_number (ecma_get_completion_value_value (completion)));
new_len_num = *ecma_get_number_from_completion_value (completion);
ecma_free_completion_value (completion);
uint32_t new_len_uint32 = ecma_number_to_uint32 (new_len_num);
// d.
if (ecma_uint32_to_number (new_len_uint32) != new_len_num)
{
return ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_RANGE));
}
else
{
// b., e.
ecma_number_t *new_len_num_p = ecma_alloc_number ();
*new_len_num_p = new_len_num;
ecma_property_descriptor_t new_len_property_desc = *property_desc_p;
new_len_property_desc.value = ecma_make_number_value (new_len_num_p);
ecma_completion_value_t ret_value = ecma_make_empty_completion_value ();
// f.
if (new_len_uint32 >= old_len_uint32)
{
// i.
magic_string_length_p = ecma_get_magic_string (LIT_MAGIC_STRING_LENGTH);
ret_value = ecma_op_general_object_define_own_property (obj_p,
magic_string_length_p,
&new_len_property_desc,
is_throw);
ecma_deref_ecma_string (magic_string_length_p);
}
else
{
// g.
if (!ecma_is_property_writable (len_prop_p))
{
ret_value = ecma_reject (is_throw);
}
else
{
// h.
bool new_writable;
if (!new_len_property_desc.is_writable_defined
|| new_len_property_desc.is_writable)
{
new_writable = true;
}
else
{
// ii.
new_writable = false;
// iii.
new_len_property_desc.is_writable_defined = true;
new_len_property_desc.is_writable = true;
}
// j.
magic_string_length_p = ecma_get_magic_string (LIT_MAGIC_STRING_LENGTH);
ecma_completion_value_t succeeded = ecma_op_general_object_define_own_property (obj_p,
magic_string_length_p,
&new_len_property_desc,
is_throw);
ecma_deref_ecma_string (magic_string_length_p);
/* Handling normal false and throw values */
if (!ecma_is_completion_value_normal_true (succeeded))
{
JERRY_ASSERT (ecma_is_completion_value_normal_false (succeeded)
|| ecma_is_completion_value_throw (succeeded));
// k.
ret_value = succeeded;
}
else
{
// l
JERRY_ASSERT (new_len_uint32 < old_len_uint32);
bool reduce_succeeded = true;
while (new_len_uint32 < old_len_uint32)
{
// i
old_len_uint32--;
// ii
ecma_string_t *old_length_string_p = ecma_new_ecma_string_from_uint32 (old_len_uint32);
ecma_completion_value_t delete_succeeded = ecma_op_object_delete (obj_p,
old_length_string_p,
false);
ecma_deref_ecma_string (old_length_string_p);
// iii
if (ecma_is_completion_value_normal_false (delete_succeeded))
{
JERRY_ASSERT (ecma_is_value_number (new_len_property_desc.value));
ecma_number_t *new_len_num_p = ecma_get_number_from_value (new_len_property_desc.value);
// 1.
*new_len_num_p = ecma_uint32_to_number (old_len_uint32 + 1);
// 2.
if (!new_writable)
{
new_len_property_desc.is_writable_defined = true;
new_len_property_desc.is_writable = false;
}
// 3.
ecma_string_t *magic_string_length_p = ecma_get_magic_string (LIT_MAGIC_STRING_LENGTH);
ecma_completion_value_t completion = ecma_op_general_object_define_own_property (obj_p,
magic_string_length_p,
&new_len_property_desc,
false);
ecma_deref_ecma_string (magic_string_length_p);
JERRY_ASSERT (ecma_is_completion_value_normal_true (completion)
|| ecma_is_completion_value_normal_false (completion));
reduce_succeeded = false;
break;
}
}
if (!reduce_succeeded)
{
ret_value = ecma_reject (is_throw);
}
else
{
// m.
if (!new_writable)
{
ecma_property_descriptor_t prop_desc_not_writable = ecma_make_empty_property_descriptor ();
prop_desc_not_writable.is_writable_defined = true;
prop_desc_not_writable.is_writable = false;
ecma_completion_value_t completion_set_not_writable;
magic_string_length_p = ecma_get_magic_string (LIT_MAGIC_STRING_LENGTH);
completion_set_not_writable = ecma_op_general_object_define_own_property (obj_p,
magic_string_length_p,
&prop_desc_not_writable,
false);
ecma_deref_ecma_string (magic_string_length_p);
JERRY_ASSERT (ecma_is_completion_value_normal_true (completion_set_not_writable));
}
ret_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE);
}
}
}
}
ecma_dealloc_number (new_len_num_p);
return ret_value;
}
JERRY_UNREACHABLE ();
}
else
{
// 4.a.
uint32_t index;
if (!ecma_string_get_array_index (property_name_p, &index))
{
// 5.
return ecma_op_general_object_define_own_property (obj_p,
property_name_p,
property_desc_p,
is_throw);
}
// 4.
// b.
if (index >= old_len_uint32
&& !ecma_is_property_writable (len_prop_p))
{
return ecma_reject (is_throw);
}
// c.
ecma_completion_value_t succeeded = ecma_op_general_object_define_own_property (obj_p,
property_name_p,
property_desc_p,
false);
// d.
JERRY_ASSERT (ecma_is_completion_value_normal_true (succeeded)
|| ecma_is_completion_value_normal_false (succeeded));
if (ecma_is_completion_value_normal_false (succeeded))
{
return ecma_reject (is_throw);
}
// e.
if (index >= old_len_uint32)
{
// i., ii.
ecma_number_t *num_p = ecma_alloc_number ();
*num_p = ecma_number_add (ecma_uint32_to_number (index), ECMA_NUMBER_ONE);
ecma_named_data_property_assign_value (obj_p, len_prop_p, ecma_make_number_value (num_p));
ecma_dealloc_number (num_p);
}
// f.
return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE);
}
JERRY_UNREACHABLE ();
} /* ecma_op_array_object_define_own_property */