/* Copyright 2014-2015 Samsung Electronics Co., Ltd. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "ecma-alloc.h" #include "ecma-array-object.h" #include "ecma-builtins.h" #include "ecma-exceptions.h" #include "ecma-gc.h" #include "ecma-globals.h" #include "ecma-helpers.h" #include "ecma-number-arithmetic.h" #include "ecma-objects.h" #include "ecma-objects-general.h" /** \addtogroup ecma ECMA * @{ * * \addtogroup ecmaarrayobject ECMA Array object related routines * @{ */ /** * Reject sequence * * @return completion value * Returned value must be freed with ecma_free_completion_value */ static ecma_completion_value_t ecma_reject (bool is_throw) /**< Throw flag */ { if (is_throw) { return ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_TYPE)); } else { return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_FALSE); } } /* ecma_reject */ /** * Array object creation operation. * * See also: ECMA-262 v5, 15.4.2.1 * ECMA-262 v5, 15.4.2.2 * * @return completion value * Returned value must be freed with ecma_free_completion_value */ ecma_completion_value_t ecma_op_create_array_object (const ecma_value_t *arguments_list_p, /**< list of arguments that are passed to Array constructor */ ecma_length_t arguments_list_len, /**< length of the arguments' list */ bool is_treat_single_arg_as_length) /**< if the value is true, arguments_list_len is 1 and single argument is Number, then treat the single argument as new Array's length rather than as single item of the Array */ { JERRY_ASSERT (arguments_list_len == 0 || arguments_list_p != NULL); uint32_t length; const ecma_value_t *array_items_p; ecma_length_t array_items_count; if (is_treat_single_arg_as_length && arguments_list_len == 1 && ecma_is_value_number (arguments_list_p[0])) { ecma_number_t *num_p = ecma_get_number_from_value (arguments_list_p[0]); uint32_t num_uint32 = ecma_number_to_uint32 (*num_p); if (*num_p != ecma_uint32_to_number (num_uint32)) { return ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_RANGE)); } else { length = num_uint32; array_items_p = NULL; array_items_count = 0; } } else { length = arguments_list_len; array_items_p = arguments_list_p; array_items_count = arguments_list_len; } #ifndef CONFIG_ECMA_COMPACT_PROFILE_DISABLE_ARRAY_BUILTIN ecma_object_t *array_prototype_obj_p = ecma_builtin_get (ECMA_BUILTIN_ID_ARRAY_PROTOTYPE); #else /* !CONFIG_ECMA_COMPACT_PROFILE_DISABLE_ARRAY_BUILTIN */ ecma_object_t *array_prototype_obj_p = ecma_builtin_get (ECMA_BUILTIN_ID_OBJECT_PROTOTYPE); #endif /* CONFIG_ECMA_COMPACT_PROFILE_DISABLE_ARRAY_BUILTIN */ ecma_object_t *obj_p = ecma_create_object (array_prototype_obj_p, true, ECMA_OBJECT_TYPE_ARRAY); ecma_deref_object (array_prototype_obj_p); ecma_property_t *class_prop_p = ecma_create_internal_property (obj_p, ECMA_INTERNAL_PROPERTY_CLASS); class_prop_p->u.internal_property.value = ECMA_MAGIC_STRING_ARRAY_UL; ecma_string_t *length_magic_string_p = ecma_get_magic_string (ECMA_MAGIC_STRING_LENGTH); ecma_number_t *length_num_p = ecma_alloc_number (); *length_num_p = ecma_uint32_to_number (length); ecma_property_t *length_prop_p = ecma_create_named_data_property (obj_p, length_magic_string_p, true, false, false); ecma_set_named_data_property_value (length_prop_p, ecma_make_number_value (length_num_p)); ecma_deref_ecma_string (length_magic_string_p); for (uint32_t index = 0; index < array_items_count; index++) { ecma_string_t* item_name_string_p = ecma_new_ecma_string_from_uint32 (index); ecma_property_descriptor_t item_prop_desc = ecma_make_empty_property_descriptor (); { item_prop_desc.is_value_defined = true; item_prop_desc.value = array_items_p [index]; item_prop_desc.is_writable_defined = true; item_prop_desc.is_writable = true; item_prop_desc.is_enumerable_defined = true; item_prop_desc.is_enumerable = true; item_prop_desc.is_configurable_defined = true; item_prop_desc.is_configurable = true; } ecma_op_object_define_own_property (obj_p, item_name_string_p, &item_prop_desc, false); ecma_deref_ecma_string (item_name_string_p); } return ecma_make_normal_completion_value (ecma_make_object_value (obj_p)); } /* ecma_op_create_array_object */ /** * [[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 (ECMA_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; // f. if (new_len_uint32 >= old_len_uint32) { // i. magic_string_length_p = ecma_get_magic_string (ECMA_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 (ECMA_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 (ECMA_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 (ECMA_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; bool is_index; if (property_name_p->container == ECMA_STRING_CONTAINER_UINT32_IN_DESC) { index = property_name_p->u.uint32_number; is_index = true; } else { ecma_number_t number = ecma_string_to_number (property_name_p); index = ecma_number_to_uint32 (number); ecma_string_t *to_uint32_to_string_p = ecma_new_ecma_string_from_uint32 (index); is_index = ecma_compare_ecma_strings (property_name_p, to_uint32_to_string_p); ecma_deref_ecma_string (to_uint32_to_string_p); } is_index = is_index && (index != ECMA_MAX_VALUE_OF_VALID_ARRAY_INDEX); if (!is_index) { // 5. return ecma_op_general_object_define_own_property (obj_p, property_name_p, property_desc_p, false); } // 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 */ /** * @} * @} */