JezK
Edit File: accessor-map-sharing.js
// Copyright 2012 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. // Flags: --allow-natives-syntax --fast-accessor-properties // Handy abbreviations. var dp = Object.defineProperty; var gop = Object.getOwnPropertyDescriptor; function getter() { return 111; } function setter(x) { print(222); } function anotherGetter() { return 333; } function anotherSetter(x) { print(444); } var obj1, obj2; // Two objects with the same getter. obj1 = {}; dp(obj1, "alpha", { get: getter }); obj2 = {}; dp(obj2, "alpha", { get: getter }); assertTrue(%HaveSameMap(obj1, obj2)); // Two objects with the same getter, oldskool. obj1 = {}; obj1.__defineGetter__("bravo", getter); assertEquals(getter, obj1.__lookupGetter__("bravo")); obj2 = {}; obj2.__defineGetter__("bravo", getter); assertEquals(getter, obj2.__lookupGetter__("bravo")); assertTrue(%HaveSameMap(obj1, obj2)); // Two objects with the same setter. obj1 = {}; dp(obj1, "charlie", { set: setter }); obj2 = {}; dp(obj2, "charlie", { set: setter }); assertTrue(%HaveSameMap(obj1, obj2)); // Two objects with the same setter, oldskool. obj1 = {}; obj1.__defineSetter__("delta", setter); assertEquals(setter, obj1.__lookupSetter__("delta")); obj2 = {}; obj2.__defineSetter__("delta", setter); assertEquals(setter, obj2.__lookupSetter__("delta")); assertTrue(%HaveSameMap(obj1, obj2)); // Two objects with the same getter and setter. obj1 = {}; dp(obj1, "foxtrot", { get: getter, set: setter }); obj2 = {}; dp(obj2, "foxtrot", { get: getter, set: setter }); assertTrue(%HaveSameMap(obj1, obj2)); // Two objects with the same getter and setter, set separately. obj1 = {}; dp(obj1, "golf", { get: getter, configurable: true }); dp(obj1, "golf", { set: setter, configurable: true }); obj2 = {}; dp(obj2, "golf", { get: getter, configurable: true }); dp(obj2, "golf", { set: setter, configurable: true }); assertTrue(%HaveSameMap(obj1, obj2)); // Two objects with the same getter and setter, set separately, oldskool. obj1 = {}; obj1.__defineGetter__("hotel", getter); obj1.__defineSetter__("hotel", setter); obj2 = {}; obj2.__defineGetter__("hotel", getter); obj2.__defineSetter__("hotel", setter); assertTrue(%HaveSameMap(obj1, obj2)); // Attribute-only change, shouldn't affect previous descriptor properties. obj1 = {}; dp(obj1, "india", { get: getter, configurable: true, enumerable: true }); assertEquals(getter, gop(obj1, "india").get); assertTrue(gop(obj1, "india").configurable); assertTrue(gop(obj1, "india").enumerable); dp(obj1, "india", { enumerable: false }); assertEquals(getter, gop(obj1, "india").get); assertTrue(gop(obj1, "india").configurable); assertFalse(gop(obj1, "india").enumerable); // Attribute-only change, shouldn't affect objects with previously shared maps. obj1 = {}; dp(obj1, "juliet", { set: setter, configurable: true, enumerable: false }); assertEquals(setter, gop(obj1, "juliet").set); assertTrue(gop(obj1, "juliet").configurable); assertFalse(gop(obj1, "juliet").enumerable); obj2 = {}; dp(obj2, "juliet", { set: setter, configurable: true, enumerable: false }); assertEquals(setter, gop(obj2, "juliet").set); assertTrue(gop(obj2, "juliet").configurable); assertFalse(gop(obj2, "juliet").enumerable); dp(obj1, "juliet", { set: setter, configurable: false, enumerable: true }); assertEquals(setter, gop(obj1, "juliet").set); assertFalse(gop(obj1, "juliet").configurable); assertTrue(gop(obj1, "juliet").enumerable); assertEquals(setter, gop(obj2, "juliet").set); assertTrue(gop(obj2, "juliet").configurable); assertFalse(gop(obj2, "juliet").enumerable); // Two objects with the different getters. obj1 = {}; dp(obj1, "kilo", { get: getter }); obj2 = {}; dp(obj2, "kilo", { get: anotherGetter }); assertEquals(getter, gop(obj1, "kilo").get); assertEquals(anotherGetter, gop(obj2, "kilo").get); assertFalse(%HaveSameMap(obj1, obj2)); // Two objects with the same getters and different setters. obj1 = {}; dp(obj1, "lima", { get: getter, set: setter }); obj2 = {}; dp(obj2, "lima", { get: getter, set: anotherSetter }); assertEquals(setter, gop(obj1, "lima").set); assertEquals(anotherSetter, gop(obj2, "lima").set); assertFalse(%HaveSameMap(obj1, obj2)); // Even 'undefined' is a kind of getter. obj1 = {}; dp(obj1, "mike", { get: undefined }); assertTrue("mike" in obj1); assertEquals(undefined, gop(obj1, "mike").get); assertEquals(undefined, obj1.__lookupGetter__("mike")); assertEquals(undefined, gop(obj1, "mike").set); assertEquals(undefined, obj1.__lookupSetter__("mike")); // Even 'undefined' is a kind of setter. obj1 = {}; dp(obj1, "november", { set: undefined }); assertTrue("november" in obj1); assertEquals(undefined, gop(obj1, "november").get); assertEquals(undefined, obj1.__lookupGetter__("november")); assertEquals(undefined, gop(obj1, "november").set); assertEquals(undefined, obj1.__lookupSetter__("november")); // Redefining a data property. obj1 = {}; obj1.oscar = 12345; dp(obj1, "oscar", { set: setter }); assertEquals(setter, gop(obj1, "oscar").set); // Re-adding the same getter/attributes pair. obj1 = {}; dp(obj1, "papa", { get: getter, configurable: true }); dp(obj1, "papa", { get: getter, set: setter, configurable: true }); assertEquals(getter, gop(obj1, "papa").get); assertEquals(setter, gop(obj1, "papa").set); assertTrue(gop(obj1, "papa").configurable); assertFalse(gop(obj1, "papa").enumerable);