Add support for Symbols when using the 'in' operation (#3202)

The change adds support for the 'in' operation to handle Symbols.

JerryScript-DCO-1.0-Signed-off-by: Peter Gal [email protected]

Author: galpeter

jerry-core/vm/opcodes-ecma-relational-equality.c

@@ -116,7 +116,9 @@ opfunc_instanceof (ecma_value_t left_value, /**< left value */
 /**
  * 'in' opcode handler.
  *
- * See also: ECMA-262 v5, 11.8.7
+ * See also:
+ *  * ECMA-262 v5, 11.8.7
+ *  * ECAM-262 v6, 12.9.3
  *
  * @return ecma value
  *         returned value must be freed with ecma_free_value.
@@ -130,28 +132,17 @@ opfunc_in (ecma_value_t left_value, /**< left value */
     return ecma_raise_type_error (ECMA_ERR_MSG ("Expected an object in 'in' check."));
   }
 
-  bool to_string = !ecma_is_value_string (left_value);
+  ecma_string_t *property_name_p = ecma_op_to_prop_name (left_value);
 
-  if (to_string)
+  if (JERRY_UNLIKELY (property_name_p == NULL))
   {
-    left_value = ecma_op_to_string (left_value);
-
-    if (ECMA_IS_VALUE_ERROR (left_value))
-    {
-      return left_value;
-    }
+    return ECMA_VALUE_ERROR;
   }
 
-  ecma_string_t *left_value_prop_name_p = ecma_get_string_from_value (left_value);
   ecma_object_t *right_value_obj_p = ecma_get_object_from_value (right_value);
-
   ecma_value_t result = ecma_make_boolean_value (ecma_op_object_has_property (right_value_obj_p,
-                                                                              left_value_prop_name_p));
-
-  if (to_string)
-  {
-    ecma_free_value (left_value);
-  }
+                                                                              property_name_p));
+  ecma_deref_ecma_string (property_name_p);
   return result;
 } /* opfunc_in */
 

tests/jerry/es2015/symbol-in.js

@@ -0,0 +1,59 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * 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.
+ */
+
+var test_symbol = Symbol ('Test');
+
+var obj = {};
+
+assert ((test_symbol in obj) === false);
+
+obj[test_symbol] = 'value';
+
+assert ((test_symbol in obj) === true);
+assert (obj[test_symbol] === 'value');
+
+
+var array = [];
+
+assert ((test_symbol in array) === false);
+
+array[test_symbol] = 'value';
+
+assert ((test_symbol in array) === true);
+assert (array[test_symbol] === 'value');
+
+
+assert ((test_symbol in Symbol) === false);
+
+try {
+  test_symbol in test_symbol;
+  assert (false);
+} catch (ex) {
+  assert (ex instanceof TypeError);
+}
+
+try {
+  test_symbol in 3;
+  assert (false);
+} catch (ex) {
+  assert (ex instanceof TypeError);
+}
+
+try {
+  test_symbol in 'Test';
+  assert (false);
+} catch (ex) {
+  assert (ex instanceof TypeError);
+}