Implement Object.getPrototypeOf()

JerryScript-DCO-1.0-Signed-off-by: Zsolt Borbély [email protected]

Author: Zsolt Borbély

jerry-core/ecma/builtin-objects/ecma-builtin-object.cpp

@@ -114,10 +114,28 @@ ecma_builtin_object_dispatch_construct (const ecma_value_t *arguments_list_p, /*
  *         Returned value must be freed with ecma_free_completion_value.
  */
 static ecma_completion_value_t
-ecma_builtin_object_object_get_prototype_of (ecma_value_t this_arg, /**< 'this' argument */
+ecma_builtin_object_object_get_prototype_of (ecma_value_t this_arg __attr_unused___, /**< 'this' argument */
                                              ecma_value_t arg) /**< routine's argument */
 {
-  ECMA_BUILTIN_CP_UNIMPLEMENTED (this_arg, arg);
+  ecma_completion_value_t ret_value = ecma_make_empty_completion_value ();
+
+  /* 1. */
+  if (!ecma_is_value_object (arg))
+  {
+    ret_value = ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_TYPE));
+  }
+  else
+  {
+    /* 2. */
+    ecma_object_t *obj_p = ecma_get_object_from_value (arg);
+
+    ecma_object_t *prototype_p = ecma_get_object_prototype (obj_p);
+    ecma_ref_object (prototype_p);
+
+    ret_value = ecma_make_normal_completion_value (ecma_make_object_value (prototype_p));
+  }
+
+  return ret_value;
 } /* ecma_builtin_object_object_get_prototype_of */
 
 /**

tests/jerry/object_getprototypeof.js

@@ -0,0 +1,45 @@
+// Copyright 2015 Samsung Electronics Co., Ltd.
+// Copyright 2015 University of Szeged.
+//
+// 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.
+
+try {
+  var v;
+  Object.getPrototypeOf(v);
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+try {
+  Object.getPrototypeOf("foo");
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+try {
+  Object.getPrototypeOf(60);
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+var obj = { x : "foo" };
+assert (Object.getPrototypeOf(obj) === Object.prototype)
+
+var constructor = function () {};
+constructor.prototype = obj;
+
+var d_obj = new constructor();
+assert (Object.getPrototypeOf(d_obj) === obj);