[es6] Partially implement Reflect.preventExtensions.

test/mjsunit/harmony/reflect-prevent-extensions.js

-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2010-2015 the V8 project authors. All rights reserved.
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 // 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
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 //       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,
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 // 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.
 
-// Tests the Object.preventExtensions method - ES 15.2.3.10
+// Tests the Reflect.preventExtensions method - ES6 26.1.12.
+// This is adapted from object-prevent-extensions.js.
 
-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --harmony-reflect
 
 
 var obj1 = {};
 // Extensible defaults to true.
 assertTrue(Object.isExtensible(obj1));
-Object.preventExtensions(obj1);
+assertTrue(Reflect.preventExtensions(obj1));
 
 // Make sure the is_extensible flag is set.
 assertFalse(Object.isExtensible(obj1));
 obj1.x = 42;
 assertEquals(undefined, obj1.x);
 
 // Try adding a new element.
 obj1[1] = 42;
 assertEquals(undefined, obj1[1]);
 
 
 // Try when the object has an existing property.
 var obj2 = {};
 assertTrue(Object.isExtensible(obj2));
 obj2.x = 42;
 assertEquals(42, obj2.x);
 assertTrue(Object.isExtensible(obj2));
 
-Object.preventExtensions(obj2);
+assertTrue(Reflect.preventExtensions(obj2));
 assertEquals(42, obj2.x);
 
 obj2.y = 42;
 // obj2.y should still be undefined.
 assertEquals(undefined, obj2.y);
 // Make sure we can still write values to obj.x.
 obj2.x = 43;
 assertEquals(43, obj2.x)
 
 obj2.y = new function() { return 42; };
@@ skipping 10 matching lines @@
 // obj2.y should still be undefined.
 assertEquals(undefined, obj2.y);
 assertEquals(43, obj2.x);
 
 obj2[1] = 42;
 assertEquals(undefined, obj2[1]);
 
 var arr = new Array();
 arr[1] = 10;
 
-Object.preventExtensions(arr);
+assertTrue(Reflect.preventExtensions(arr));
 
 arr[2] = 42;
 assertEquals(10, arr[1]);
 
-// We should still be able to change exiting elements.
+// We should still be able to change existing elements.
 arr[1]= 42;
 assertEquals(42, arr[1]);
 
 
 // Test the the extensible flag is not inherited.
 var parent = {};
 parent.x = 42;
-Object.preventExtensions(parent);
+assertTrue(Reflect.preventExtensions(parent));
 
 var child = Object.create(parent);
 
 // We should be able to add new properties to the child object.
 child.y = 42;
 
 // This should have no influence on the parent class.
 parent.y = 29;
 
 
 // Test that attributes on functions are also handled correctly.
 function foo() {
   return 42;
 }
 
-Object.preventExtensions(foo);
+assertTrue(Reflect.preventExtensions(foo));
 
 foo.x = 29;
 assertEquals(undefined, foo.x);
 
 // when Object.isExtensible(o) === false
 // assignment should return right hand side value
-var o = Object.preventExtensions({});
+var o = {};
+assertTrue(Reflect.preventExtensions(o));
 var v = o.v = 50;
 assertEquals(undefined, o.v);
 assertEquals(50, v);
 
 // test same behavior as above, but for integer properties
 var n = o[0] = 100;
 assertEquals(undefined, o[0]);
 assertEquals(100, n);
 
 // Fast properties should remain fast
 obj = { x: 42, y: 'foo' };
 assertTrue(%HasFastProperties(obj));
-Object.preventExtensions(obj);
+assertTrue(Reflect.preventExtensions(obj));
 assertFalse(Object.isExtensible(obj));
 assertFalse(Object.isSealed(obj));
 assertTrue(%HasFastProperties(obj));
 
 // Non-extensible objects should share maps where possible
 obj = { prop1: 1, prop2: 2 };
 obj2 = { prop1: 3, prop2: 4 };
 assertTrue(%HaveSameMap(obj, obj2));
-Object.preventExtensions(obj);
-Object.preventExtensions(obj2);
+assertTrue(Reflect.preventExtensions(obj));
+assertTrue(Reflect.preventExtensions(obj2));
 assertFalse(Object.isExtensible(obj));
 assertFalse(Object.isExtensible(obj2));
 assertFalse(Object.isSealed(obj));
 assertFalse(Object.isSealed(obj2));
 assertTrue(%HaveSameMap(obj, obj2));
 
 // Non-extensible objects should share maps even when they have elements
 obj = { prop1: 1, prop2: 2, 75: 'foo' };
 obj2 = { prop1: 3, prop2: 4, 150: 'bar' };
 assertTrue(%HaveSameMap(obj, obj2));
-Object.preventExtensions(obj);
-Object.preventExtensions(obj2);
+assertTrue(Reflect.preventExtensions(obj));
+assertTrue(Reflect.preventExtensions(obj2));
 assertFalse(Object.isExtensible(obj));
 assertFalse(Object.isExtensible(obj2));
 assertFalse(Object.isSealed(obj));
 assertFalse(Object.isSealed(obj2));
 assertTrue(%HaveSameMap(obj, obj2));