Introducing constructor for ecma_property_descriptor_t.

src/libecmaobjects/ecma-helpers.c

@@ -742,6 +742,38 @@ ecma_free_array( ecma_array_first_chunk_t *first_chunk_p) /**< first chunk of th
     }
 } /* ecma_free_array */
 
+/**
+ * Construct empty property descriptor.
+ *
+ * @return property descriptor with all *_defined properties set to false,
+ *         and rest properties set to default values (ECMA-262 v5, Table 7).
+ */
+ecma_property_descriptor_t
+ecma_make_empty_property_descriptor( void)
+{
+  ecma_property_descriptor_t prop_desc = (ecma_property_descriptor_t) {
+        .is_value_defined = false,
+        .value = ecma_make_simple_value( ECMA_SIMPLE_VALUE_UNDEFINED),
+
+        .is_writable_defined = false,
+        .writable = ECMA_PROPERTY_NOT_WRITABLE,
+
+        .is_enumerable_defined = false,
+        .enumerable = ECMA_PROPERTY_NOT_ENUMERABLE,
+
+        .is_configurable_defined = false,
+        .configurable = ECMA_PROPERTY_NOT_CONFIGURABLE,
+
+        .is_get_defined = false,
+        .get_p = NULL,
+
+        .is_set_defined = false,
+        .set_p = NULL
+  };
+
+  return prop_desc;
+} /* ecma_make_empty_property_descriptor */
+
 /**
  * @}
  * @}

src/libecmaobjects/ecma-helpers.h

@@ -69,10 +69,10 @@ extern bool ecma_is_completion_value_normal_true( ecma_completion_value_t value)
 extern bool ecma_is_completion_value_normal_false( ecma_completion_value_t value);
 extern bool ecma_is_empty_completion_value( ecma_completion_value_t value);
 
+/* ecma-helpers.c */
 extern ecma_object_t* ecma_create_object( ecma_object_t *prototype_object_p, bool is_extensible, ecma_object_type_t type);
 extern ecma_object_t* ecma_create_lexical_environment( ecma_object_t *outer_lexical_environment_p, ecma_lexical_environment_type_t type);
 
-/* ecma-helpers.c */
 extern ecma_property_t* ecma_create_internal_property(ecma_object_t *object_p, ecma_internal_property_id_t property_id);
 extern ecma_property_t* ecma_find_internal_property(ecma_object_t *object_p, ecma_internal_property_id_t property_id);
 extern ecma_property_t* ecma_get_internal_property(ecma_object_t *object_p, ecma_internal_property_id_t property_id);
@@ -97,6 +97,8 @@ extern bool ecma_compare_zt_string_to_ecma_string( const ecma_char_t *string_p,
 extern bool ecma_compare_ecma_string_to_ecma_string(const ecma_array_first_chunk_t *string1_p, const ecma_array_first_chunk_t *string2_p);
 extern void ecma_free_array( ecma_array_first_chunk_t *first_chunk_p);
 
+extern ecma_property_descriptor_t ecma_make_empty_property_descriptor( void);
+
 #endif /* !JERRY_ECMA_HELPERS_H */
 
 /**