Added Object.defineProperty + needed internal functionality:...

test/mjsunit/object-define-property.js

+// Copyright 2010 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.
+
+// Tests the object.defineProperty method - ES 15.2.3.6
+
+
+
+// Check that an exception is thrown when null is passed as object.
+try {
+  Object.defineProperty(null, null, null);
+  assertTrue(false);
+} catch (e) {
+  assertTrue(/called on non-object/.test(e));
+}
+
+// Check that an exception is thrown when undefined is passed as object.
+try {
+  Object.defineProperty(undefined, undefined, undefined);
+  assertTrue(false);
+} catch (e) {
+  assertTrue(/called on non-object/.test(e));
+}
+
+// Check that an exception is thrown when non-object is passed as object.
+try {
+  Object.defineProperty(0, "foo", undefined);
+  assertTrue(false);
+} catch (e) {
+  assertTrue(/called on non-object/.test(e));
+}
+
+// Object
+var obj1 = {};
+
+// Values
+var val1 = 0;
+var val2 = 0;
+var val3 = 0;
+
+// Descriptors
+var emptyDesc = {};
+
+var accessorConfigurable = { 
+    set: function() { val1++; },
+    get: function() { return val1; },
+    configurable: true
+};
+
+var accessorNoConfigurable = {
+    set: function() { val2++; },
+    get: function() { return val2; },
+    configurable: false 
+};
+
+var accessorOnlySet = {
+  set: function() { val3++; },
+  configurable: true
+};
+
+var accessorOnlyGet = {
+  get: function() { return val3; },
+  configurable: true
+};
+
+var accessorDefault = {set: function(){} };
+
+var dataConfigurable = { value: 1000, configurable: true };
+
+var dataNoConfigurable = { value: 2000, configurable: false };
+
+var dataWritable = { value: 3000, writable: true};
+
+
+// Check that we can't add property with undefined attributes.
+try {
+  Object.defineProperty(obj1, "foo", undefined);
+  assertTrue(false);
+} catch (e) {
+  assertTrue(/must be an object/.test(e));
+}
+
+// Make sure that we can add a property with an empty descriptor and
+// that it has the default descriptor values.
+Object.defineProperty(obj1, "foo", emptyDesc);
+
+// foo should be undefined as it has no get, set or value
+assertEquals(undefined, obj1.foo);
+
+// We should, however, be able to retrieve the propertydescriptor which should
+// have all default values (according to 8.6.1).
+var desc = Object.getOwnPropertyDescriptor(obj1, "foo");
+assertFalse(desc.configurable);
+assertFalse(desc.enumerable);
+assertFalse(desc.writable);
+assertEquals(desc.get, undefined);
+assertEquals(desc.set, undefined);
+assertEquals(desc.value, undefined);
+
+// Make sure that getOwnPropertyDescriptor does not return a descriptor
+// with default values if called with non existing property (otherwise
+// the test above is invalid).
+desc = Object.getOwnPropertyDescriptor(obj1, "bar");
+assertEquals(desc, undefined);
+
+// Make sure that foo can't be reset (as configurable is false).
+try {
+  Object.defineProperty(obj1, "foo", accessorConfigurable);
+} catch (e) {
+  assertTrue(/Cannot redefine property/.test(e));
+}
+
+
+// Accessor properties
+
+Object.defineProperty(obj1, "bar", accessorConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj1, "bar");
+assertTrue(desc.configurable);
+assertFalse(desc.enumerable);
+assertEquals(desc.writable, undefined);
+assertEquals(desc.get, accessorConfigurable.get);
+assertEquals(desc.set, accessorConfigurable.set);
+assertEquals(desc.value, undefined);
+assertEquals(1, obj1.bar = 1);
+assertEquals(1, val1);
+assertEquals(1, obj1.bar = 1);
+assertEquals(2, val1);
+assertEquals(2, obj1.bar);
+
+// Redefine bar with non configurable test
+Object.defineProperty(obj1, "bar", accessorNoConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj1, "bar");
+assertFalse(desc.configurable);
+assertFalse(desc.enumerable);
+assertEquals(desc.writable, undefined);
+assertEquals(desc.get, accessorNoConfigurable.get);
+assertEquals(desc.set, accessorNoConfigurable.set);
+assertEquals(desc.value, undefined);
+assertEquals(1, obj1.bar = 1);
+assertEquals(2, val1);
+assertEquals(1, val2);
+assertEquals(1, obj1.bar = 1)
+assertEquals(2, val1);
+assertEquals(2, val2);
+assertEquals(2, obj1.bar);
+
+// Try to redefine bar again - should fail as configurable is false.
+try {
+  Object.defineProperty(obj1, "bar", accessorConfigurable);
+  assertTrue(false);
+} catch(e) {
+  assertTrue(/Cannot redefine property/.test(e));
+}
+
+// Try to redefine bar again using the data descriptor - should fail.
+try {
+  Object.defineProperty(obj1, "bar", dataConfigurable);
+  assertTrue(false);
+} catch(e) {
+  assertTrue(/Cannot redefine property/.test(e));
+}
+
+// Redefine using same descriptor - should succeed.
+Object.defineProperty(obj1, "bar", accessorNoConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj1, "bar");
+assertFalse(desc.configurable);
+assertFalse(desc.enumerable);
+assertEquals(desc.writable, undefined);
+assertEquals(desc.get, accessorNoConfigurable.get);
+assertEquals(desc.set, accessorNoConfigurable.set);
+assertEquals(desc.value, undefined);
+assertEquals(1, obj1.bar = 1);
+assertEquals(2, val1);
+assertEquals(3, val2);
+assertEquals(1, obj1.bar = 1)
+assertEquals(2, val1);
+assertEquals(4, val2);
+assertEquals(4, obj1.bar);
+
+// Define an accessor that has only a setter
+Object.defineProperty(obj1, "setOnly", accessorOnlySet);
+desc = Object.getOwnPropertyDescriptor(obj1, "setOnly");
+assertTrue(desc.configurable);
+assertFalse(desc.enumerable);
+assertEquals(desc.set, accessorOnlySet.set);
+assertEquals(desc.writable, undefined);
+assertEquals(desc.value, undefined);
+assertEquals(desc.get, undefined);
+assertEquals(1, obj1.setOnly = 1);
+assertEquals(1, val3);
+
+// Add a getter - should not touch the setter
+Object.defineProperty(obj1, "setOnly", accessorOnlyGet);
+desc = Object.getOwnPropertyDescriptor(obj1, "setOnly");
+assertTrue(desc.configurable);
+assertFalse(desc.enumerable);
+assertEquals(desc.get, accessorOnlyGet.get);
+assertEquals(desc.set, accessorOnlySet.set);
+assertEquals(desc.writable, undefined);
+assertEquals(desc.value, undefined);
+assertEquals(1, obj1.setOnly = 1);
+assertEquals(2, val3);
+
+// The above should also work if redefining just a getter or setter on 
+// an existing property with both a getter and a setter.
+Object.defineProperty(obj1, "both", accessorConfigurable);
+
+Object.defineProperty(obj1, "both", accessorOnlySet);
+desc = Object.getOwnPropertyDescriptor(obj1, "both");
+assertTrue(desc.configurable);
+assertFalse(desc.enumerable);
+assertEquals(desc.set, accessorOnlySet.set);
+assertEquals(desc.get, accessorConfigurable.get);
+assertEquals(desc.writable, undefined);
+assertEquals(desc.value, undefined);
+assertEquals(1, obj1.both = 1);
+assertEquals(3, val3);
+
+
+// Data properties
+
+Object.defineProperty(obj1, "foobar", dataConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj1, "foobar");
+assertEquals(obj1.foobar, 1000);
+assertEquals(desc.value, 1000);
+assertTrue(desc.configurable);
+assertFalse(desc.writable);
+assertFalse(desc.enumerable);
+assertEquals(desc.get, undefined);
+assertEquals(desc.set, undefined);
+//Try writing to non writable attribute - should remain 1000
+obj1.foobar = 1001;
+assertEquals(obj1.foobar, 1000);
+
+
+// Redefine to writable descriptor - now writing to foobar should be allowed
+Object.defineProperty(obj1, "foobar", dataWritable);
+desc = Object.getOwnPropertyDescriptor(obj1, "foobar");
+assertEquals(obj1.foobar, 3000);
+assertEquals(desc.value, 3000);
+// Note that since dataWritable does not define configurable the configurable
+// setting from the redefined property (in this case true) is used.
+assertTrue(desc.configurable);
+assertTrue(desc.writable);
+assertFalse(desc.enumerable);
+assertEquals(desc.get, undefined);
+assertEquals(desc.set, undefined);
+// Writing to the property should now be allowed
+obj1.foobar = 1001;
+assertEquals(obj1.foobar, 1001);
+
+
+// Redefine with non configurable data property.
+Object.defineProperty(obj1, "foobar", dataNoConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj1, "foobar");
+assertEquals(obj1.foobar, 2000);
+assertEquals(desc.value, 2000);
+assertFalse(desc.configurable);
+assertFalse(desc.writable);
+assertFalse(desc.enumerable);
+assertEquals(desc.get, undefined);
+assertEquals(desc.set, undefined);
+
+// Try redefine again - shold fail because configurable is now false.
+try {
+  Object.defineProperty(obj1, "foobar", dataConfigurable);
+  assertTrue(false);
+} catch (e) {
+  assertTrue(/Cannot redefine property/.test(e));
+}
+
+// Try redefine again with accessor property - shold also fail.
+try {
+  Object.defineProperty(obj1, "foobar", dataConfigurable);
+  assertTrue(false);
+} catch (e) {
+  assertTrue(/Cannot redefine property/.test(e));
+}
+
+
+// Redifine with the same descriptor - should succeed (step 6).
+Object.defineProperty(obj1, "foobar", dataNoConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj1, "foobar");
+assertEquals(obj1.foobar, 2000);
+assertEquals(desc.value, 2000);
+assertFalse(desc.configurable);
+assertFalse(desc.writable);
+assertFalse(desc.enumerable);
+assertEquals(desc.get, undefined);
+assertEquals(desc.set, undefined);
+
+
+// New object
+var obj2 = {};
+
+// Make accessor - redefine to data
+Object.defineProperty(obj2, "foo", accessorConfigurable);
+
+// Redefine to data property
+Object.defineProperty(obj2, "foo", dataConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj2, "foo");
+assertEquals(obj2.foo, 1000);
+assertEquals(desc.value, 1000);
+assertTrue(desc.configurable);
+assertFalse(desc.writable);
+assertFalse(desc.enumerable);
+assertEquals(desc.get, undefined);
+assertEquals(desc.set, undefined);
+
+
+// Redefine back to accessor
+Object.defineProperty(obj2, "foo", accessorConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj2, "foo");
+assertTrue(desc.configurable);
+assertFalse(desc.enumerable);
+assertEquals(desc.writable, undefined);
+assertEquals(desc.get, accessorConfigurable.get);
+assertEquals(desc.set, accessorConfigurable.set);
+assertEquals(desc.value, undefined);
+assertEquals(1, obj2.foo = 1);
+assertEquals(3, val1);
+assertEquals(4, val2);
+assertEquals(3, obj2.foo);
+
+// Make data - redefine to accessor
+Object.defineProperty(obj2, "bar", dataConfigurable)
+
+// Redefine to accessor property
+Object.defineProperty(obj2, "bar", accessorConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj2, "bar");
+assertTrue(desc.configurable);
+assertFalse(desc.enumerable);
+assertEquals(desc.writable, undefined);
+assertEquals(desc.get, accessorConfigurable.get);
+assertEquals(desc.set, accessorConfigurable.set);
+assertEquals(desc.value, undefined);
+assertEquals(1, obj2.bar = 1);
+assertEquals(4, val1);
+assertEquals(4, val2);
+assertEquals(4, obj2.foo);
+
+// Redefine back to data property
+Object.defineProperty(obj2, "bar", dataConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj2, "bar");
+assertEquals(obj2.bar, 1000);
+assertEquals(desc.value, 1000);
+assertTrue(desc.configurable);
+assertFalse(desc.writable);
+assertFalse(desc.enumerable);
+assertEquals(desc.get, undefined);
+assertEquals(desc.set, undefined);
+
+
+// Redefinition of an accessor defined using __defineGetter__ and 
+// __defineSetter__
+function get(){return this.x}
+function set(x){this.x=x};
+
+var obj3 = {x:1000};
+obj3.__defineGetter__("foo", get);
+obj3.__defineSetter__("foo", set);
+
+desc = Object.getOwnPropertyDescriptor(obj3, "foo");
+assertTrue(desc.configurable);
+assertTrue(desc.enumerable);
+assertEquals(desc.writable, undefined);
+assertEquals(desc.get, get);
+assertEquals(desc.set, set);
+assertEquals(desc.value, undefined);
+assertEquals(1, obj3.foo = 1);
+assertEquals(1, obj3.x);
+assertEquals(1, obj3.foo);
+
+// Redefine to accessor property (non configurable) - note that enumerable
+// which we do not redefine should remain the same (true).
+Object.defineProperty(obj3, "foo", accessorNoConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj3, "foo");
+assertFalse(desc.configurable);
+assertTrue(desc.enumerable);
+assertEquals(desc.writable, undefined);
+assertEquals(desc.get, accessorNoConfigurable.get);
+assertEquals(desc.set, accessorNoConfigurable.set);
+assertEquals(desc.value, undefined);
+assertEquals(1, obj3.foo = 1);
+assertEquals(5, val2);
+assertEquals(5, obj3.foo);
+
+
+obj3.__defineGetter__("bar", get);
+obj3.__defineSetter__("bar", set);
+
+
+// Redefine back to data property
+Object.defineProperty(obj3, "bar", dataConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj3, "bar");
+assertEquals(obj3.bar, 1000);
+assertEquals(desc.value, 1000);
+assertTrue(desc.configurable);
+assertFalse(desc.writable);
+assertTrue(desc.enumerable);
+assertEquals(desc.get, undefined);
+assertEquals(desc.set, undefined);
+
+
+var obj4 = {};
+var func = function (){return 42;};
+obj4.bar = func;
+assertEquals(42, obj4.bar());
+
+Object.defineProperty(obj4, "bar", accessorConfigurable);
+desc = Object.getOwnPropertyDescriptor(obj4, "bar");
+assertTrue(desc.configurable);
+assertTrue(desc.enumerable);
+assertEquals(desc.writable, undefined);
+assertEquals(desc.get, accessorConfigurable.get);
+assertEquals(desc.set, accessorConfigurable.set);
+assertEquals(desc.value, undefined);
+assertEquals(1, obj4.bar = 1);
+assertEquals(5, val1);
+assertEquals(5, obj4.bar);
+
+// Make sure an error is thrown when trying to access to redefined function
+try {
+  obj4.bar();
+  assertTrue(false);
+} catch (e) {
+  assertTrue(/is not a function/.test(e));
+}
+
+
+