/* 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-builtins.h" #include "ecma-exceptions.h" #include "ecma-function-object.h" #include "ecma-gc.h" #include "ecma-globals.h" #include "ecma-helpers.h" #include "ecma-objects.h" #include "ecma-objects-general.h" #include "ecma-try-catch-macro.h" /** \addtogroup ecma ECMA * @{ * * \addtogroup ecmageneralobjectsinternalops General ECMA objects' operations * @{ */ /** * 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 */ /** * 'Object' object creation operation with no arguments. * * See also: ECMA-262 v5, 15.2.2.1 * * @return pointer to newly created 'Object' object */ ecma_object_t* ecma_op_create_object_object_noarg (void) { ecma_object_t *object_prototype_p = ecma_builtin_get (ECMA_BUILTIN_ID_OBJECT_PROTOTYPE); // 3., 4., 6., 7. ecma_object_t *obj_p = ecma_create_object (object_prototype_p, true, ECMA_OBJECT_TYPE_GENERAL); ecma_deref_object (object_prototype_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_OBJECT_UL; return obj_p; } /* ecma_op_create_object_object_noarg */ /** * 'Object' object creation operation with one argument. * * See also: ECMA-262 v5, 15.2.2.1 * * @return pointer to newly created 'Object' object */ ecma_completion_value_t ecma_op_create_object_object_arg (const ecma_value_t& value) /**< argument of constructor */ { ecma_check_value_type_is_spec_defined (value); if (ecma_is_value_object (value) || ecma_is_value_number (value) || ecma_is_value_string (value) || ecma_is_value_boolean (value)) { // 1.b, 1.c, 1.d return ecma_op_to_object (value); } else { // 2. JERRY_ASSERT (ecma_is_value_undefined (value) || ecma_is_value_null (value)); ecma_object_t *obj_p = ecma_op_create_object_object_noarg (); return ecma_make_normal_completion_value (ecma_make_object_value (obj_p)); } } /* ecma_op_create_object_object_arg */ /** * [[Get]] ecma general object's operation * * See also: * ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8 * ECMA-262 v5, 8.12.3 * * @return completion value * Returned value must be freed with ecma_free_completion_value */ ecma_completion_value_t ecma_op_general_object_get (ecma_object_t *obj_p, /**< the object */ ecma_string_t *property_name_p) /**< property name */ { JERRY_ASSERT(obj_p != NULL && !ecma_is_lexical_environment (obj_p)); JERRY_ASSERT(property_name_p != NULL); // 1. const ecma_property_t* prop_p = ecma_op_object_get_property (obj_p, property_name_p); // 2. if (prop_p == NULL) { return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_UNDEFINED); } // 3. if (prop_p->type == ECMA_PROPERTY_NAMEDDATA) { return ecma_make_normal_completion_value (ecma_copy_value (ecma_get_named_data_property_value (prop_p), true)); } else { // 4. ecma_object_t *getter_p = ECMA_GET_POINTER (ecma_object_t, prop_p->u.named_accessor_property.get_p); // 5. if (getter_p == NULL) { return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_UNDEFINED); } else { return ecma_op_function_call (getter_p, ecma_make_object_value (obj_p), NULL, 0); } } JERRY_UNREACHABLE(); } /* ecma_op_general_object_get */ /** * [[GetOwnProperty]] ecma general object's operation * * See also: * ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8 * ECMA-262 v5, 8.12.2 * * @return pointer to a property - if it exists, * NULL (i.e. ecma-undefined) - otherwise. */ ecma_property_t* ecma_op_general_object_get_own_property (ecma_object_t *obj_p, /**< the object */ ecma_string_t *property_name_p) /**< property name */ { JERRY_ASSERT(obj_p != NULL && !ecma_is_lexical_environment (obj_p)); JERRY_ASSERT(property_name_p != NULL); return ecma_find_named_property (obj_p, property_name_p); } /* ecma_op_general_object_get_own_property */ /** * [[GetProperty]] ecma general object's operation * * See also: * ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8 * ECMA-262 v5, 8.12.2 * * @return pointer to a property - if it exists, * NULL (i.e. ecma-undefined) - otherwise. */ ecma_property_t* ecma_op_general_object_get_property (ecma_object_t *obj_p, /**< the object */ ecma_string_t *property_name_p) /**< property name */ { JERRY_ASSERT(obj_p != NULL && !ecma_is_lexical_environment (obj_p)); JERRY_ASSERT(property_name_p != NULL); // 1. ecma_property_t *prop_p = ecma_op_object_get_own_property (obj_p, property_name_p); // 2. if (prop_p != NULL) { return prop_p; } // 3. ecma_object_t *prototype_p = ecma_get_object_prototype (obj_p); // 4., 5. if (prototype_p != NULL) { return ecma_op_object_get_property (prototype_p, property_name_p); } else { return NULL; } } /* ecma_op_general_object_get_property */ /** * [[Put]] ecma general object's operation * * See also: * ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8 * ECMA-262 v5, 8.12.5 * * @return completion value * Returned value must be freed with ecma_free_completion_value */ ecma_completion_value_t ecma_op_general_object_put (ecma_object_t *obj_p, /**< the object */ ecma_string_t *property_name_p, /**< property name */ const ecma_value_t& value, /**< ecma-value */ bool is_throw) /**< flag that controls failure handling */ { JERRY_ASSERT(obj_p != NULL && !ecma_is_lexical_environment (obj_p)); JERRY_ASSERT(property_name_p != NULL); // 1. if (!ecma_op_object_can_put (obj_p, property_name_p)) { if (is_throw) { // a. return ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_TYPE)); } else { // b. return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_FALSE); } } // 2. ecma_property_t *own_desc_p = ecma_op_object_get_own_property (obj_p, property_name_p); // 3. if (own_desc_p != NULL && own_desc_p->type == ECMA_PROPERTY_NAMEDDATA) { // a. ecma_property_descriptor_t value_desc = ecma_make_empty_property_descriptor (); { value_desc.is_value_defined = true; value_desc.value = value; } // b., c. return ecma_op_object_define_own_property (obj_p, property_name_p, &value_desc, is_throw); } // 4. ecma_property_t *desc_p = ecma_op_object_get_property (obj_p, property_name_p); // 5. if (desc_p != NULL && desc_p->type == ECMA_PROPERTY_NAMEDACCESSOR) { // a. ecma_object_t *setter_p = ECMA_GET_NON_NULL_POINTER (ecma_object_t, desc_p->u.named_accessor_property.set_p); JERRY_ASSERT(setter_p != NULL); ecma_completion_value_t ret_value; ECMA_TRY_CATCH (call_ret, ecma_op_function_call (setter_p, ecma_make_object_value (obj_p), &value, 1), ret_value); ret_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE); ECMA_FINALIZE (call_ret); return ret_value; } else { // 6. // a. ecma_property_descriptor_t new_desc = ecma_make_empty_property_descriptor (); { new_desc.is_value_defined = true; new_desc.value = value; new_desc.is_writable_defined = true; new_desc.is_writable = true; new_desc.is_enumerable_defined = true; new_desc.is_enumerable = true; new_desc.is_configurable_defined = true; new_desc.is_configurable = true; } // b. return ecma_op_object_define_own_property (obj_p, property_name_p, &new_desc, is_throw); } JERRY_UNREACHABLE(); } /* ecma_op_general_object_put */ /** * [[CanPut]] ecma general object's operation * * See also: * ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8 * ECMA-262 v5, 8.12.4 * * @return true - if [[Put]] with the given property name can be performed; * false - otherwise. */ bool ecma_op_general_object_can_put (ecma_object_t *obj_p, /**< the object */ ecma_string_t *property_name_p) /**< property name */ { JERRY_ASSERT(obj_p != NULL && !ecma_is_lexical_environment (obj_p)); JERRY_ASSERT(property_name_p != NULL); // 1. ecma_property_t *prop_p = ecma_op_object_get_own_property (obj_p, property_name_p); // 2. if (prop_p != NULL) { // a. if (prop_p->type == ECMA_PROPERTY_NAMEDACCESSOR) { ecma_object_t *setter_p = ECMA_GET_POINTER (ecma_object_t, prop_p->u.named_accessor_property.set_p); // i. if (setter_p == NULL) { return false; } // ii. return true; } else { // b. JERRY_ASSERT(prop_p->type == ECMA_PROPERTY_NAMEDDATA); return ecma_is_property_writable (prop_p); } } // 3. ecma_object_t *proto_p = ecma_get_object_prototype (obj_p); // 4. if (proto_p == NULL) { return ecma_get_object_extensible (obj_p); } // 5. ecma_property_t *inherited_p = ecma_op_object_get_property (proto_p, property_name_p); // 6. if (inherited_p == NULL) { return ecma_get_object_extensible (obj_p); } // 7. if (inherited_p->type == ECMA_PROPERTY_NAMEDACCESSOR) { ecma_object_t *setter_p = ECMA_GET_POINTER (ecma_object_t, inherited_p->u.named_accessor_property.set_p); // a. if (setter_p == NULL) { return false; } // b. return true; } else { // 8. JERRY_ASSERT(inherited_p->type == ECMA_PROPERTY_NAMEDDATA); // a. if (!ecma_get_object_extensible (obj_p)) { return false; } else { // b. return ecma_is_property_writable (inherited_p); } } JERRY_UNREACHABLE(); } /* ecma_op_general_object_can_put */ /** * [[Delete]] ecma general object's operation * * See also: * ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8 * ECMA-262 v5, 8.12.7 * * @return completion value * Returned value must be freed with ecma_free_completion_value */ ecma_completion_value_t ecma_op_general_object_delete (ecma_object_t *obj_p, /**< the object */ ecma_string_t *property_name_p, /**< property name */ bool is_throw) /**< flag that controls failure handling */ { JERRY_ASSERT(obj_p != NULL && !ecma_is_lexical_environment (obj_p)); JERRY_ASSERT(property_name_p != NULL); // 1. ecma_property_t *desc_p = ecma_op_object_get_own_property (obj_p, property_name_p); // 2. if (desc_p == NULL) { return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE); } // 3. if (ecma_is_property_configurable (desc_p)) { // a. ecma_delete_property (obj_p, desc_p); // b. return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE); } else if (is_throw) { // 4. return ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_TYPE)); } else { // 5. return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_FALSE); } JERRY_UNREACHABLE(); } /* ecma_op_general_object_delete */ /** * [[DefaultValue]] ecma general object's operation * * See also: * ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8 * ECMA-262 v5, 8.12.8 * * @return completion value * Returned value must be freed with ecma_free_completion_value */ ecma_completion_value_t ecma_op_general_object_default_value (ecma_object_t *obj_p, /**< the object */ ecma_preferred_type_hint_t hint) /**< hint on preferred result type */ { JERRY_ASSERT(obj_p != NULL && !ecma_is_lexical_environment (obj_p)); if (hint == ECMA_PREFERRED_TYPE_NO) { ecma_property_t *class_prop_p = ecma_get_internal_property (obj_p, ECMA_INTERNAL_PROPERTY_CLASS); ecma_magic_string_id_t obj_class = (ecma_magic_string_id_t) class_prop_p->u.internal_property.value; if (obj_class == ECMA_MAGIC_STRING_DATE_UL) { hint = ECMA_PREFERRED_TYPE_STRING; } else { hint = ECMA_PREFERRED_TYPE_NUMBER; } } for (uint32_t i = 1; i <= 2; i++) { ecma_magic_string_id_t function_name_magic_string_id; if ((i == 1 && hint == ECMA_PREFERRED_TYPE_STRING) || (i == 2 && hint == ECMA_PREFERRED_TYPE_NUMBER)) { function_name_magic_string_id = ECMA_MAGIC_STRING_TO_STRING_UL; } else { function_name_magic_string_id = ECMA_MAGIC_STRING_VALUE_OF_UL; } ecma_string_t *function_name_p = ecma_get_magic_string (function_name_magic_string_id); ecma_completion_value_t function_value_get_completion = ecma_op_object_get (obj_p, function_name_p); ecma_deref_ecma_string (function_name_p); if (!ecma_is_completion_value_normal (function_value_get_completion)) { return function_value_get_completion; } ecma_completion_value_t call_completion = ecma_make_empty_completion_value (); if (ecma_op_is_callable (ecma_get_completion_value_value (function_value_get_completion))) { ecma_object_t *func_obj_p = ecma_get_object_from_completion_value (function_value_get_completion); call_completion = ecma_op_function_call (func_obj_p, ecma_make_object_value (obj_p), NULL, 0); } ecma_free_completion_value (function_value_get_completion); if (!ecma_is_completion_value_normal (call_completion)) { return call_completion; } if (!ecma_is_completion_value_empty (call_completion) && !ecma_is_value_object (ecma_get_completion_value_value (call_completion))) { return call_completion; } ecma_free_completion_value (call_completion); } return ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_TYPE)); } /* ecma_op_general_object_default_value */ /** * [[DefineOwnProperty]] ecma general object's operation * * See also: * ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8 * ECMA-262 v5, 8.12.9 * * @return completion value * Returned value must be freed with ecma_free_completion_value */ ecma_completion_value_t ecma_op_general_object_define_own_property (ecma_object_t *obj_p, /**< the 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(obj_p != NULL && !ecma_is_lexical_environment (obj_p)); JERRY_ASSERT(property_name_p != NULL); const bool is_property_desc_generic_descriptor = (!property_desc_p->is_value_defined && !property_desc_p->is_writable_defined && !property_desc_p->is_get_defined && !property_desc_p->is_set_defined); const bool is_property_desc_data_descriptor = (property_desc_p->is_value_defined || property_desc_p->is_writable_defined); const bool is_property_desc_accessor_descriptor = (property_desc_p->is_get_defined || property_desc_p->is_set_defined); // 1. ecma_property_t *current_p = ecma_op_object_get_own_property (obj_p, property_name_p); // 2. bool extensible = ecma_get_object_extensible (obj_p); if (current_p == NULL) { // 3. if (!extensible) { return ecma_reject (is_throw); } // 4. // a. if (is_property_desc_generic_descriptor || is_property_desc_data_descriptor) { ecma_property_t *new_prop_p = ecma_create_named_data_property (obj_p, property_name_p, property_desc_p->is_writable, property_desc_p->is_enumerable, property_desc_p->is_configurable); ecma_named_data_property_assign_value (obj_p, new_prop_p, property_desc_p->value); } else { // b. JERRY_ASSERT(is_property_desc_accessor_descriptor); ecma_create_named_accessor_property (obj_p, property_name_p, property_desc_p->get_p, property_desc_p->set_p, property_desc_p->is_enumerable, property_desc_p->is_configurable); } return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE); } // 5. if (is_property_desc_generic_descriptor && !property_desc_p->is_enumerable_defined && !property_desc_p->is_configurable_defined) { return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE); } // 6. const bool is_current_data_descriptor = (current_p->type == ECMA_PROPERTY_NAMEDDATA); const bool is_current_accessor_descriptor = (current_p->type == ECMA_PROPERTY_NAMEDACCESSOR); JERRY_ASSERT(is_current_data_descriptor || is_current_accessor_descriptor); bool is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = true; if (property_desc_p->is_value_defined) { if (!is_current_data_descriptor || !ecma_op_same_value (property_desc_p->value, ecma_get_named_data_property_value (current_p))) { is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false; } } if (property_desc_p->is_writable_defined) { if (!is_current_data_descriptor || property_desc_p->is_writable != ecma_is_property_writable (current_p)) { is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false; } } if (property_desc_p->is_get_defined) { if (!is_current_accessor_descriptor || property_desc_p->get_p != ECMA_GET_POINTER (ecma_object_t, current_p->u.named_accessor_property.get_p)) { is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false; } } if (property_desc_p->is_set_defined) { if (!is_current_accessor_descriptor || property_desc_p->set_p != ECMA_GET_POINTER (ecma_object_t, current_p->u.named_accessor_property.set_p)) { is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false; } } if (property_desc_p->is_enumerable_defined) { if (property_desc_p->is_enumerable != ecma_is_property_enumerable (current_p)) { is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false; } } if (property_desc_p->is_configurable_defined) { if (property_desc_p->is_configurable != ecma_is_property_configurable (current_p)) { is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false; } } if (is_every_field_in_desc_also_occurs_in_current_desc_with_same_value) { return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE); } // 7. if (!ecma_is_property_configurable (current_p)) { if (property_desc_p->is_configurable || (property_desc_p->is_enumerable_defined && property_desc_p->is_enumerable != ecma_is_property_enumerable (current_p))) { // a., b. return ecma_reject (is_throw); } } // 8. if (is_property_desc_generic_descriptor) { // no action required } else if (is_property_desc_data_descriptor != is_current_data_descriptor) { // 9. if (!ecma_is_property_configurable (current_p)) { // a. return ecma_reject (is_throw); } ecma_delete_property (obj_p, current_p); if (is_current_data_descriptor) { // b. current_p = ecma_create_named_accessor_property (obj_p, property_name_p, NULL, NULL, ecma_is_property_enumerable (current_p), ecma_is_property_configurable (current_p)); } else { // c. current_p = ecma_create_named_data_property (obj_p, property_name_p, false, ecma_is_property_enumerable (current_p), ecma_is_property_configurable (current_p)); } } else if (is_property_desc_data_descriptor && is_current_data_descriptor) { // 10. if (!ecma_is_property_configurable (current_p)) { // a. if (!ecma_is_property_writable (current_p)) { // i. if (property_desc_p->is_writable) { return ecma_reject (is_throw); } // ii. if (property_desc_p->is_value_defined && !ecma_op_same_value (property_desc_p->value, ecma_get_named_data_property_value (current_p))) { return ecma_reject (is_throw); } } } } else { JERRY_ASSERT(is_property_desc_accessor_descriptor && is_current_accessor_descriptor); // 11. if (!ecma_is_property_configurable (current_p)) { // a. if ((property_desc_p->is_get_defined && property_desc_p->get_p != ECMA_GET_POINTER (ecma_object_t, current_p->u.named_accessor_property.get_p)) || (property_desc_p->is_set_defined && property_desc_p->set_p != ECMA_GET_POINTER (ecma_object_t, current_p->u.named_accessor_property.set_p))) { // i., ii. return ecma_reject (is_throw); } } } // 12. if (property_desc_p->is_value_defined) { JERRY_ASSERT(is_current_data_descriptor); ecma_named_data_property_assign_value (obj_p, current_p, property_desc_p->value); } if (property_desc_p->is_writable_defined) { JERRY_ASSERT(is_current_data_descriptor); ecma_set_property_writable_attr (current_p, property_desc_p->is_writable); } if (property_desc_p->is_get_defined) { JERRY_ASSERT(is_current_accessor_descriptor); ecma_object_t *get_p = property_desc_p->get_p; ECMA_SET_POINTER(current_p->u.named_accessor_property.get_p, get_p); ecma_gc_update_may_ref_younger_object_flag_by_object (obj_p, get_p); } if (property_desc_p->is_set_defined) { JERRY_ASSERT(is_current_accessor_descriptor); ecma_object_t *set_p = property_desc_p->set_p; ECMA_SET_POINTER(current_p->u.named_accessor_property.set_p, set_p); ecma_gc_update_may_ref_younger_object_flag_by_object (obj_p, set_p); } if (property_desc_p->is_enumerable_defined) { ecma_set_property_enumerable_attr (current_p, property_desc_p->is_enumerable); } if (property_desc_p->is_configurable_defined) { ecma_set_property_configurable_attr (current_p, property_desc_p->is_configurable); } return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE); } /* ecma_op_general_object_define_own_property */ /** * @} * @} */