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      1 // Copyright 2013 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 // Flags: --harmony-symbols
     29 
     30 // Fake Symbol if undefined, allowing test to run in non-Harmony mode as well.
     31 this.Symbol = typeof Symbol != 'undefined' ? Symbol : String;
     32 
     33 
     34 var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
     35 var getProto = desc.get;
     36 var setProto = desc.set;
     37 
     38 function TestNoPoisonPill() {
     39   assertEquals("function", typeof desc.get);
     40   assertEquals("function", typeof desc.set);
     41   assertDoesNotThrow("desc.get.call({})");
     42   assertDoesNotThrow("desc.set.call({}, {})");
     43 
     44   var obj = {};
     45   var obj2 = {};
     46   desc.set.call(obj, obj2);
     47   assertEquals(obj.__proto__, obj2);
     48   assertEquals(desc.get.call(obj), obj2);
     49 }
     50 TestNoPoisonPill();
     51 
     52 
     53 function TestRedefineObjectPrototypeProtoGetter() {
     54   Object.defineProperty(Object.prototype, "__proto__", {
     55     get: function() {
     56       return 42;
     57     }
     58   });
     59   assertEquals({}.__proto__, 42);
     60   assertEquals(desc.get.call({}), Object.prototype);
     61 
     62   var desc2 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
     63   assertEquals(desc2.get.call({}), 42);
     64   assertEquals(desc2.set.call({}), undefined);
     65 
     66   Object.defineProperty(Object.prototype, "__proto__", {
     67     set: function(x) {}
     68   });
     69   var desc3 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
     70   assertEquals(desc3.get.call({}), 42);
     71   assertEquals(desc3.set.call({}), undefined);
     72 }
     73 TestRedefineObjectPrototypeProtoGetter();
     74 
     75 
     76 function TestRedefineObjectPrototypeProtoSetter() {
     77   Object.defineProperty(Object.prototype, "__proto__", { set: undefined });
     78   assertThrows(function() {
     79     "use strict";
     80     var o = {};
     81     var p = {};
     82     o.__proto__ = p;
     83   }, TypeError);
     84 }
     85 TestRedefineObjectPrototypeProtoSetter();
     86 
     87 
     88 function TestGetProtoOfValues() {
     89   assertEquals(getProto.call(1), Number.prototype);
     90   assertEquals(getProto.call(true), Boolean.prototype);
     91   assertEquals(getProto.call(false), Boolean.prototype);
     92   assertEquals(getProto.call('s'), String.prototype);
     93   assertEquals(getProto.call(Symbol()), Symbol.prototype);
     94 
     95   assertThrows(function() { getProto.call(null); }, TypeError);
     96   assertThrows(function() { getProto.call(undefined); }, TypeError);
     97 }
     98 TestGetProtoOfValues();
     99 
    100 
    101 var values = [1, true, false, 's', Symbol()];
    102 
    103 
    104 function TestSetProtoOfValues() {
    105   var proto = {};
    106   for (var i = 0; i < values.length; i++) {
    107     assertEquals(setProto.call(values[i], proto), undefined);
    108   }
    109 
    110   assertThrows(function() { setProto.call(null, proto); }, TypeError);
    111   assertThrows(function() { setProto.call(undefined, proto); }, TypeError);
    112 }
    113 TestSetProtoOfValues();
    114 
    115 
    116 function TestSetProtoToValue() {
    117   var object = {};
    118   var proto = {};
    119   setProto.call(object, proto);
    120 
    121   var valuesWithUndefined = values.concat(undefined);
    122 
    123   for (var i = 0; i < valuesWithUndefined.length; i++) {
    124     assertEquals(setProto.call(object, valuesWithUndefined[i]), undefined);
    125     assertEquals(getProto.call(object), proto);
    126   }
    127 
    128   // null is the only valid value that can be used as a [[Prototype]].
    129   assertEquals(setProto.call(object, null), undefined);
    130   assertEquals(getProto.call(object), null);
    131 }
    132 TestSetProtoToValue();
    133 
    134 
    135 function TestDeleteProto() {
    136   assertTrue(delete Object.prototype.__proto__);
    137   var o = {};
    138   var p = {};
    139   o.__proto__ = p;
    140   assertEquals(Object.getPrototypeOf(o), Object.prototype);
    141   var desc4 = Object.getOwnPropertyDescriptor(o, "__proto__");
    142   assertTrue(desc4.configurable);
    143   assertTrue(desc4.enumerable);
    144   assertTrue(desc4.writable);
    145   assertEquals(desc4.value, p);
    146 }
    147 TestDeleteProto();
    148