| // 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 |
| |
| // Flags: --allow-natives-syntax |
| |
| // Check that an exception is thrown when null is passed as object. |
| var exception = false; |
| try { |
| Object.defineProperty(null, null, null); |
| } catch (e) { |
| exception = true; |
| assertTrue(/called on non-object/.test(e)); |
| } |
| assertTrue(exception); |
| |
| // Check that an exception is thrown when undefined is passed as object. |
| exception = false; |
| try { |
| Object.defineProperty(undefined, undefined, undefined); |
| } catch (e) { |
| exception = true; |
| assertTrue(/called on non-object/.test(e)); |
| } |
| assertTrue(exception); |
| |
| // Check that an exception is thrown when non-object is passed as object. |
| exception = false; |
| try { |
| Object.defineProperty(0, "foo", undefined); |
| } catch (e) { |
| exception = true; |
| assertTrue(/called on non-object/.test(e)); |
| } |
| assertTrue(exception); |
| |
| // Object. |
| var obj1 = {}; |
| |
| // Values. |
| var val1 = 0; |
| var val2 = 0; |
| var val3 = 0; |
| |
| function setter1() {val1++; } |
| function getter1() {return val1; } |
| |
| function setter2() {val2++; } |
| function getter2() {return val2; } |
| |
| function setter3() {val3++; } |
| function getter3() {return val3; } |
| |
| |
| // Descriptors. |
| var emptyDesc = {}; |
| |
| var accessorConfigurable = { |
| set: setter1, |
| get: getter1, |
| configurable: true |
| }; |
| |
| var accessorNoConfigurable = { |
| set: setter2, |
| get: getter2, |
| configurable: false |
| }; |
| |
| var accessorOnlySet = { |
| set: setter3, |
| configurable: true |
| }; |
| |
| var accessorOnlyGet = { |
| get: getter3, |
| 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); |
| assertTrue(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); |
| assertTrue(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)); |
| } |
| |
| |
| // Test runtime calls to DefineOrRedefineDataProperty and |
| // DefineOrRedefineAccessorProperty - make sure we don't |
| // crash. |
| try { |
| %DefineOrRedefineAccessorProperty(0, 0, 0, 0, 0); |
| } catch (e) { |
| assertTrue(/illegal access/.test(e)); |
| } |
| |
| try { |
| %DefineOrRedefineDataProperty(0, 0, 0, 0); |
| } catch (e) { |
| assertTrue(/illegal access/.test(e)); |
| } |
| |
| try { |
| %DefineOrRedefineDataProperty(null, null, null, null); |
| } catch (e) { |
| assertTrue(/illegal access/.test(e)); |
| } |
| |
| try { |
| %DefineOrRedefineAccessorProperty(null, null, null, null, null); |
| } catch (e) { |
| assertTrue(/illegal access/.test(e)); |
| } |
| |
| try { |
| %DefineOrRedefineDataProperty({}, null, null, null); |
| } catch (e) { |
| assertTrue(/illegal access/.test(e)); |
| } |
| |
| // Defining properties null should fail even when we have |
| // other allowed values |
| try { |
| %DefineOrRedefineAccessorProperty(null, 'foo', 0, func, 0); |
| } catch (e) { |
| assertTrue(/illegal access/.test(e)); |
| } |
| |
| try { |
| %DefineOrRedefineDataProperty(null, 'foo', 0, 0); |
| } catch (e) { |
| assertTrue(/illegal access/.test(e)); |
| } |
| |
| // Test that all possible differences in step 6 in DefineOwnProperty are |
| // exercised, i.e., any difference in the given property descriptor and the |
| // existing properties should not return true, but throw an error if the |
| // existing configurable property is false. |
| |
| var obj5 = {}; |
| // Enumerable will default to false. |
| Object.defineProperty(obj5, 'foo', accessorNoConfigurable); |
| desc = Object.getOwnPropertyDescriptor(obj5, 'foo'); |
| // First, test that we are actually allowed to set the accessor if all |
| // values are of the descriptor are the same as the existing one. |
| Object.defineProperty(obj5, 'foo', accessorNoConfigurable); |
| |
| // Different setter. |
| var descDifferent = { |
| configurable:false, |
| enumerable:false, |
| set: setter1, |
| get: getter2 |
| }; |
| |
| try { |
| Object.defineProperty(obj5, 'foo', descDifferent); |
| assertTrue(false); |
| } catch (e) { |
| assertTrue(/Cannot redefine property/.test(e)); |
| } |
| |
| // Different getter. |
| descDifferent = { |
| configurable:false, |
| enumerable:false, |
| set: setter2, |
| get: getter1 |
| }; |
| |
| try { |
| Object.defineProperty(obj5, 'foo', descDifferent); |
| assertTrue(false); |
| } catch (e) { |
| assertTrue(/Cannot redefine property/.test(e)); |
| } |
| |
| // Different enumerable. |
| descDifferent = { |
| configurable:false, |
| enumerable:true, |
| set: setter2, |
| get: getter2 |
| }; |
| |
| try { |
| Object.defineProperty(obj5, 'foo', descDifferent); |
| assertTrue(false); |
| } catch (e) { |
| assertTrue(/Cannot redefine property/.test(e)); |
| } |
| |
| // Different configurable. |
| descDifferent = { |
| configurable:false, |
| enumerable:true, |
| set: setter2, |
| get: getter2 |
| }; |
| |
| try { |
| Object.defineProperty(obj5, 'foo', descDifferent); |
| assertTrue(false); |
| } catch (e) { |
| assertTrue(/Cannot redefine property/.test(e)); |
| } |
| |
| // No difference. |
| descDifferent = { |
| configurable:false, |
| enumerable:false, |
| set: setter2, |
| get: getter2 |
| }; |
| // Make sure we can still redefine if all properties are the same. |
| Object.defineProperty(obj5, 'foo', descDifferent); |
| |
| // Make sure that obj5 still holds the original values. |
| desc = Object.getOwnPropertyDescriptor(obj5, 'foo'); |
| assertEquals(desc.get, getter2); |
| assertEquals(desc.set, setter2); |
| assertFalse(desc.enumerable); |
| assertFalse(desc.configurable); |
| |
| |
| // Also exercise step 6 on data property, writable and enumerable |
| // defaults to false. |
| Object.defineProperty(obj5, 'bar', dataNoConfigurable); |
| |
| // Test that redefinition with the same property descriptor is possible |
| Object.defineProperty(obj5, 'bar', dataNoConfigurable); |
| |
| // Different value. |
| descDifferent = { |
| configurable:false, |
| enumerable:false, |
| writable: false, |
| value: 1999 |
| }; |
| |
| try { |
| Object.defineProperty(obj5, 'bar', descDifferent); |
| assertTrue(false); |
| } catch (e) { |
| assertTrue(/Cannot redefine property/.test(e)); |
| } |
| |
| // Different writable. |
| descDifferent = { |
| configurable:false, |
| enumerable:false, |
| writable: true, |
| value: 2000 |
| }; |
| |
| try { |
| Object.defineProperty(obj5, 'bar', descDifferent); |
| assertTrue(false); |
| } catch (e) { |
| assertTrue(/Cannot redefine property/.test(e)); |
| } |
| |
| |
| // Different enumerable. |
| descDifferent = { |
| configurable:false, |
| enumerable:true , |
| writable:false, |
| value: 2000 |
| }; |
| |
| try { |
| Object.defineProperty(obj5, 'bar', descDifferent); |
| assertTrue(false); |
| } catch (e) { |
| assertTrue(/Cannot redefine property/.test(e)); |
| } |
| |
| |
| // Different configurable. |
| descDifferent = { |
| configurable:true, |
| enumerable:false, |
| writable:false, |
| value: 2000 |
| }; |
| |
| try { |
| Object.defineProperty(obj5, 'bar', descDifferent); |
| assertTrue(false); |
| } catch (e) { |
| assertTrue(/Cannot redefine property/.test(e)); |
| } |
| |
| // No difference. |
| descDifferent = { |
| configurable:false, |
| enumerable:false, |
| writable:false, |
| value:2000 |
| }; |
| // Make sure we can still redefine if all properties are the same. |
| Object.defineProperty(obj5, 'bar', descDifferent); |
| |
| // Make sure that obj5 still holds the original values. |
| desc = Object.getOwnPropertyDescriptor(obj5, 'bar'); |
| assertEquals(desc.value, 2000); |
| assertFalse(desc.writable); |
| assertFalse(desc.enumerable); |
| assertFalse(desc.configurable); |
| |
| |
| // Make sure that we can't overwrite +0 with -0 and vice versa. |
| var descMinusZero = {value: -0, configurable: false}; |
| var descPlusZero = {value: +0, configurable: false}; |
| |
| Object.defineProperty(obj5, 'minuszero', descMinusZero); |
| |
| // Make sure we can redefine with -0. |
| Object.defineProperty(obj5, 'minuszero', descMinusZero); |
| |
| exception = false; |
| try { |
| Object.defineProperty(obj5, 'minuszero', descPlusZero); |
| } catch (e) { |
| exception = true; |
| assertTrue(/Cannot redefine property/.test(e)); |
| } |
| assertTrue(exception); |
| |
| |
| Object.defineProperty(obj5, 'pluszero', descPlusZero); |
| |
| // Make sure we can redefine with +0. |
| Object.defineProperty(obj5, 'pluszero', descPlusZero); |
| |
| exception = false; |
| try { |
| Object.defineProperty(obj5, 'pluszero', descMinusZero); |
| } catch (e) { |
| exception = true; |
| assertTrue(/Cannot redefine property/.test(e)); |
| } |
| assertTrue(exception); |
| |
| |
| var obj6 = {}; |
| obj6[1] = 'foo'; |
| obj6[2] = 'bar'; |
| obj6[3] = '42'; |
| obj6[4] = '43'; |
| obj6[5] = '44'; |
| |
| var descElement = { value: 'foobar' }; |
| var descElementNonConfigurable = { value: 'barfoo', configurable: false }; |
| var descElementNonWritable = { value: 'foofoo', writable: false }; |
| var descElementNonEnumerable = { value: 'barbar', enumerable: false }; |
| var descElementAllFalse = { value: 'foofalse', |
| configurable: false, |
| writable: false, |
| enumerable: false }; |
| |
| |
| // Redefine existing property. |
| Object.defineProperty(obj6, '1', descElement); |
| desc = Object.getOwnPropertyDescriptor(obj6, '1'); |
| assertEquals(desc.value, 'foobar'); |
| assertTrue(desc.writable); |
| assertTrue(desc.enumerable); |
| assertTrue(desc.configurable); |
| |
| // Redefine existing property with configurable: false. |
| Object.defineProperty(obj6, '2', descElementNonConfigurable); |
| desc = Object.getOwnPropertyDescriptor(obj6, '2'); |
| assertEquals(desc.value, 'barfoo'); |
| assertTrue(desc.writable); |
| assertTrue(desc.enumerable); |
| assertFalse(desc.configurable); |
| |
| // Can use defineProperty to change the value of a non |
| // configurable property. |
| try { |
| Object.defineProperty(obj6, '2', descElement); |
| desc = Object.getOwnPropertyDescriptor(obj6, '2'); |
| assertEquals(desc.value, 'foobar'); |
| } catch (e) { |
| assertUnreachable(); |
| } |
| |
| // Ensure that we can't change the descriptor of a |
| // non configurable property. |
| exception = false; |
| try { |
| var descAccessor = { get: function() { return 0; } }; |
| Object.defineProperty(obj6, '2', descAccessor); |
| } catch (e) { |
| exception = true; |
| assertTrue(/Cannot redefine property/.test(e)); |
| } |
| assertTrue(exception); |
| |
| Object.defineProperty(obj6, '2', descElementNonWritable); |
| desc = Object.getOwnPropertyDescriptor(obj6, '2'); |
| assertEquals(desc.value, 'foofoo'); |
| assertFalse(desc.writable); |
| assertTrue(desc.enumerable); |
| assertFalse(desc.configurable); |
| |
| Object.defineProperty(obj6, '3', descElementNonWritable); |
| desc = Object.getOwnPropertyDescriptor(obj6, '3'); |
| assertEquals(desc.value, 'foofoo'); |
| assertFalse(desc.writable); |
| assertTrue(desc.enumerable); |
| assertTrue(desc.configurable); |
| |
| // Redefine existing property with configurable: false. |
| Object.defineProperty(obj6, '4', descElementNonEnumerable); |
| desc = Object.getOwnPropertyDescriptor(obj6, '4'); |
| assertEquals(desc.value, 'barbar'); |
| assertTrue(desc.writable); |
| assertFalse(desc.enumerable); |
| assertTrue(desc.configurable); |
| |
| // Redefine existing property with configurable: false. |
| Object.defineProperty(obj6, '5', descElementAllFalse); |
| desc = Object.getOwnPropertyDescriptor(obj6, '5'); |
| assertEquals(desc.value, 'foofalse'); |
| assertFalse(desc.writable); |
| assertFalse(desc.enumerable); |
| assertFalse(desc.configurable); |
| |
| // Define non existing property - all attributes should default to false. |
| Object.defineProperty(obj6, '15', descElement); |
| desc = Object.getOwnPropertyDescriptor(obj6, '15'); |
| assertEquals(desc.value, 'foobar'); |
| assertFalse(desc.writable); |
| assertFalse(desc.enumerable); |
| assertFalse(desc.configurable); |
| |
| // Make sure that we can't redefine using direct access. |
| obj6[15] ='overwrite'; |
| assertEquals(obj6[15],'foobar'); |
| |
| |
| // Repeat the above tests on an array. |
| var arr = new Array(); |
| arr[1] = 'foo'; |
| arr[2] = 'bar'; |
| arr[3] = '42'; |
| arr[4] = '43'; |
| arr[5] = '44'; |
| |
| var descElement = { value: 'foobar' }; |
| var descElementNonConfigurable = { value: 'barfoo', configurable: false }; |
| var descElementNonWritable = { value: 'foofoo', writable: false }; |
| var descElementNonEnumerable = { value: 'barbar', enumerable: false }; |
| var descElementAllFalse = { value: 'foofalse', |
| configurable: false, |
| writable: false, |
| enumerable: false }; |
| |
| |
| // Redefine existing property. |
| Object.defineProperty(arr, '1', descElement); |
| desc = Object.getOwnPropertyDescriptor(arr, '1'); |
| assertEquals(desc.value, 'foobar'); |
| assertTrue(desc.writable); |
| assertTrue(desc.enumerable); |
| assertTrue(desc.configurable); |
| |
| // Redefine existing property with configurable: false. |
| Object.defineProperty(arr, '2', descElementNonConfigurable); |
| desc = Object.getOwnPropertyDescriptor(arr, '2'); |
| assertEquals(desc.value, 'barfoo'); |
| assertTrue(desc.writable); |
| assertTrue(desc.enumerable); |
| assertFalse(desc.configurable); |
| |
| // Can use defineProperty to change the value of a non |
| // configurable property of an array. |
| try { |
| Object.defineProperty(arr, '2', descElement); |
| desc = Object.getOwnPropertyDescriptor(arr, '2'); |
| assertEquals(desc.value, 'foobar'); |
| } catch (e) { |
| assertUnreachable(); |
| } |
| |
| // Ensure that we can't change the descriptor of a |
| // non configurable property. |
| exception = false; |
| try { |
| var descAccessor = { get: function() { return 0; } }; |
| Object.defineProperty(arr, '2', descAccessor); |
| } catch (e) { |
| exception = true; |
| assertTrue(/Cannot redefine property/.test(e)); |
| } |
| assertTrue(exception); |
| |
| Object.defineProperty(arr, '2', descElementNonWritable); |
| desc = Object.getOwnPropertyDescriptor(arr, '2'); |
| assertEquals(desc.value, 'foofoo'); |
| assertFalse(desc.writable); |
| assertTrue(desc.enumerable); |
| assertFalse(desc.configurable); |
| |
| Object.defineProperty(arr, '3', descElementNonWritable); |
| desc = Object.getOwnPropertyDescriptor(arr, '3'); |
| assertEquals(desc.value, 'foofoo'); |
| assertFalse(desc.writable); |
| assertTrue(desc.enumerable); |
| assertTrue(desc.configurable); |
| |
| // Redefine existing property with configurable: false. |
| Object.defineProperty(arr, '4', descElementNonEnumerable); |
| desc = Object.getOwnPropertyDescriptor(arr, '4'); |
| assertEquals(desc.value, 'barbar'); |
| assertTrue(desc.writable); |
| assertFalse(desc.enumerable); |
| assertTrue(desc.configurable); |
| |
| // Redefine existing property with configurable: false. |
| Object.defineProperty(arr, '5', descElementAllFalse); |
| desc = Object.getOwnPropertyDescriptor(arr, '5'); |
| assertEquals(desc.value, 'foofalse'); |
| assertFalse(desc.writable); |
| assertFalse(desc.enumerable); |
| assertFalse(desc.configurable); |
| |
| // Define non existing property - all attributes should default to false. |
| Object.defineProperty(arr, '15', descElement); |
| desc = Object.getOwnPropertyDescriptor(arr, '15'); |
| assertEquals(desc.value, 'foobar'); |
| assertFalse(desc.writable); |
| assertFalse(desc.enumerable); |
| assertFalse(desc.configurable); |
| |
| // See issue 968: http://code.google.com/p/v8/issues/detail?id=968 |
| var o = { x : 42 }; |
| Object.defineProperty(o, "x", { writable: false }); |
| assertEquals(42, o.x); |
| o.x = 37; |
| assertEquals(42, o.x); |
| |
| o = { x : 42 }; |
| Object.defineProperty(o, "x", {}); |
| assertEquals(42, o.x); |
| o.x = 37; |
| // Writability is preserved. |
| assertEquals(37, o.x); |
| |
| var o = { }; |
| Object.defineProperty(o, "x", { writable: false }); |
| assertEquals(undefined, o.x); |
| o.x = 37; |
| assertEquals(undefined, o.x); |
| |
| o = { get x() { return 87; } }; |
| Object.defineProperty(o, "x", { writable: false }); |
| assertEquals(undefined, o.x); |
| o.x = 37; |
| assertEquals(undefined, o.x); |
| |
| // Ignore inherited properties. |
| o = { __proto__ : { x : 87 } }; |
| Object.defineProperty(o, "x", { writable: false }); |
| assertEquals(undefined, o.x); |
| o.x = 37; |
| assertEquals(undefined, o.x); |
| |
| function testDefineProperty(obj, propertyName, desc, resultDesc) { |
| Object.defineProperty(obj, propertyName, desc); |
| var actualDesc = Object.getOwnPropertyDescriptor(obj, propertyName); |
| assertEquals(resultDesc.enumerable, actualDesc.enumerable); |
| assertEquals(resultDesc.configurable, actualDesc.configurable); |
| if (resultDesc.hasOwnProperty('value')) { |
| assertEquals(resultDesc.value, actualDesc.value); |
| assertEquals(resultDesc.writable, actualDesc.writable); |
| assertFalse(resultDesc.hasOwnProperty('get')); |
| assertFalse(resultDesc.hasOwnProperty('set')); |
| } else { |
| assertEquals(resultDesc.get, actualDesc.get); |
| assertEquals(resultDesc.set, actualDesc.set); |
| assertFalse(resultDesc.hasOwnProperty('value')); |
| assertFalse(resultDesc.hasOwnProperty('writable')); |
| } |
| } |
| |
| // tests redefining existing property with a generic descriptor |
| o = { p : 42 }; |
| testDefineProperty(o, 'p', |
| { }, |
| { value : 42, writable : true, enumerable : true, configurable : true }); |
| |
| o = { p : 42 }; |
| testDefineProperty(o, 'p', |
| { enumerable : true }, |
| { value : 42, writable : true, enumerable : true, configurable : true }); |
| |
| o = { p : 42 }; |
| testDefineProperty(o, 'p', |
| { configurable : true }, |
| { value : 42, writable : true, enumerable : true, configurable : true }); |
| |
| o = { p : 42 }; |
| testDefineProperty(o, 'p', |
| { enumerable : false }, |
| { value : 42, writable : true, enumerable : false, configurable : true }); |
| |
| o = { p : 42 }; |
| testDefineProperty(o, 'p', |
| { configurable : false }, |
| { value : 42, writable : true, enumerable : true, configurable : false }); |
| |
| o = { p : 42 }; |
| testDefineProperty(o, 'p', |
| { enumerable : true, configurable : true }, |
| { value : 42, writable : true, enumerable : true, configurable : true }); |
| |
| o = { p : 42 }; |
| testDefineProperty(o, 'p', |
| { enumerable : false, configurable : true }, |
| { value : 42, writable : true, enumerable : false, configurable : true }); |
| |
| o = { p : 42 }; |
| testDefineProperty(o, 'p', |
| { enumerable : true, configurable : false }, |
| { value : 42, writable : true, enumerable : true, configurable : false }); |
| |
| o = { p : 42 }; |
| testDefineProperty(o, 'p', |
| { enumerable : false, configurable : false }, |
| { value : 42, writable : true, enumerable : false, configurable : false }); |
| |
| // can make a writable, non-configurable field non-writable |
| o = { p : 42 }; |
| Object.defineProperty(o, 'p', { configurable: false }); |
| testDefineProperty(o, 'p', |
| { writable: false }, |
| { value : 42, writable : false, enumerable : true, configurable : false }); |
| |
| // redefine of get only property with generic descriptor |
| o = {}; |
| Object.defineProperty(o, 'p', |
| { get : getter1, enumerable: true, configurable: true }); |
| testDefineProperty(o, 'p', |
| { enumerable : false, configurable : false }, |
| { get: getter1, set: undefined, enumerable : false, configurable : false }); |
| |
| // redefine of get/set only property with generic descriptor |
| o = {}; |
| Object.defineProperty(o, 'p', |
| { get: getter1, set: setter1, enumerable: true, configurable: true }); |
| testDefineProperty(o, 'p', |
| { enumerable : false, configurable : false }, |
| { get: getter1, set: setter1, enumerable : false, configurable : false }); |
| |
| // redefine of set only property with generic descriptor |
| o = {}; |
| Object.defineProperty(o, 'p', |
| { set : setter1, enumerable: true, configurable: true }); |
| testDefineProperty(o, 'p', |
| { enumerable : false, configurable : false }, |
| { get: undefined, set: setter1, enumerable : false, configurable : false }); |
| |
| |
| // Regression test: Ensure that growing dictionaries are not ignored. |
| o = {}; |
| for (var i = 0; i < 1000; i++) { |
| // Non-enumerable property forces dictionary mode. |
| Object.defineProperty(o, i, {value: i, enumerable: false}); |
| } |
| assertEquals(999, o[999]); |
| |
| |
| // Regression test: Bizzare behavior on non-strict arguments object. |
| (function test(arg0) { |
| // Here arguments[0] is a fast alias on arg0. |
| Object.defineProperty(arguments, "0", { |
| value:1, |
| enumerable:false |
| }); |
| // Here arguments[0] is a slow alias on arg0. |
| Object.defineProperty(arguments, "0", { |
| value:2, |
| writable:false |
| }); |
| // Here arguments[0] is no alias at all. |
| Object.defineProperty(arguments, "0", { |
| value:3 |
| }); |
| assertEquals(2, arg0); |
| assertEquals(3, arguments[0]); |
| })(0); |