[es6] Partially implement Reflect.getOwnPropertyDescriptor.

test/mjsunit/harmony/reflect-get-own-property-descriptor.js

-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2015 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // This file only tests very simple descriptors that always have
 // configurable, enumerable, and writable set to true.
-// A range of more elaborate tests are performed in
-// object-define-property.js
+
+// This is adapted from mjsunit/get-own-property-descriptor.js.
+
+// Flags: --harmony-reflect
 
 function get() { return x; }
 function set(x) { this.x = x; }
 
 var obj = {x: 1};
 obj.__defineGetter__("accessor", get);
 obj.__defineSetter__("accessor", set);
 var a = new Array();
 a[1] = 42;
 obj[1] = 42;
 
-var descIsData = Object.getOwnPropertyDescriptor(obj, 'x');
+var descIsData = Reflect.getOwnPropertyDescriptor(obj, 'x');
 assertTrue(descIsData.enumerable);
 assertTrue(descIsData.writable);
 assertTrue(descIsData.configurable);
 
-var descIsAccessor = Object.getOwnPropertyDescriptor(obj, 'accessor');
+var descIsAccessor = Reflect.getOwnPropertyDescriptor(obj, 'accessor');
 assertTrue(descIsAccessor.enumerable);
 assertTrue(descIsAccessor.configurable);
 assertTrue(descIsAccessor.get == get);
 assertTrue(descIsAccessor.set == set);
 
-var descIsNotData = Object.getOwnPropertyDescriptor(obj, 'not-x');
+var descIsNotData = Reflect.getOwnPropertyDescriptor(obj, 'not-x');
 assertTrue(descIsNotData == undefined);
 
-var descIsNotAccessor = Object.getOwnPropertyDescriptor(obj, 'not-accessor');
+var descIsNotAccessor = Reflect.getOwnPropertyDescriptor(obj, 'not-accessor');
 assertTrue(descIsNotAccessor == undefined);
 
-var descArray = Object.getOwnPropertyDescriptor(a, '1');
+var descArray = Reflect.getOwnPropertyDescriptor(a, '1');
 assertTrue(descArray.enumerable);
 assertTrue(descArray.configurable);
 assertTrue(descArray.writable);
 assertEquals(descArray.value, 42);
 
-var descObjectElement = Object.getOwnPropertyDescriptor(obj, '1');
+var descObjectElement = Reflect.getOwnPropertyDescriptor(obj, '1');
 assertTrue(descObjectElement.enumerable);
 assertTrue(descObjectElement.configurable);
 assertTrue(descObjectElement.writable);
 assertEquals(descObjectElement.value, 42);
 
 // String objects.
 var a = new String('foobar');
 for (var i = 0; i < a.length; i++) {
-  var descStringObject = Object.getOwnPropertyDescriptor(a, i);
+  var descStringObject = Reflect.getOwnPropertyDescriptor(a, i);
   assertTrue(descStringObject.enumerable);
   assertFalse(descStringObject.configurable);
   assertFalse(descStringObject.writable);
   assertEquals(descStringObject.value, a.substring(i, i+1));
 }
 
 // Support for additional attributes on string objects.
 a.x = 42;
 a[10] = 'foo';
-var descStringProperty = Object.getOwnPropertyDescriptor(a, 'x');
+var descStringProperty = Reflect.getOwnPropertyDescriptor(a, 'x');
 assertTrue(descStringProperty.enumerable);
 assertTrue(descStringProperty.configurable);
 assertTrue(descStringProperty.writable);
 assertEquals(descStringProperty.value, 42);
 
-var descStringElement = Object.getOwnPropertyDescriptor(a, '10');
+var descStringElement = Reflect.getOwnPropertyDescriptor(a, '10');
 assertTrue(descStringElement.enumerable);
 assertTrue(descStringElement.configurable);
 assertTrue(descStringElement.writable);
 assertEquals(descStringElement.value, 'foo');
 
 // Test that elements in the prototype chain is not returned.
 var proto = {};
 proto[10] = 42;
 
 var objWithProto = new Array();
 objWithProto.prototype = proto;
 objWithProto[0] = 'bar';
-var descWithProto = Object.getOwnPropertyDescriptor(objWithProto, '10');
+var descWithProto = Reflect.getOwnPropertyDescriptor(objWithProto, '10');
 assertEquals(undefined, descWithProto);
 
 // Test elements on global proxy object.
 var global = (function() { return this; })();
 
 global[42] = 42;
 
 function el_getter() { return 239; };
 function el_setter() {};
 Object.defineProperty(global, '239', {get: el_getter, set: el_setter});
 
-var descRegularElement = Object.getOwnPropertyDescriptor(global, '42');
+var descRegularElement = Reflect.getOwnPropertyDescriptor(global, '42');
 assertEquals(42, descRegularElement.value);
 
-var descAccessorElement = Object.getOwnPropertyDescriptor(global, '239');
+var descAccessorElement = Reflect.getOwnPropertyDescriptor(global, '239');
 assertEquals(el_getter, descAccessorElement.get);
 assertEquals(el_setter, descAccessorElement.set);