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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 // Fake Symbol if undefined, allowing test to run in non-Harmony mode as well.
     29 this.Symbol = typeof Symbol != 'undefined' ? Symbol : String;
     30 
     31 
     32 var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
     33 var getProto = desc.get;
     34 var setProto = desc.set;
     35 
     36 function TestNoPoisonPill() {
     37   assertEquals("function", typeof desc.get);
     38   assertEquals("function", typeof desc.set);
     39   assertDoesNotThrow("desc.get.call({})");
     40   assertDoesNotThrow("desc.set.call({}, {})");
     41 
     42   var obj = {};
     43   var obj2 = {};
     44   desc.set.call(obj, obj2);
     45   assertEquals(obj.__proto__, obj2);
     46   assertEquals(desc.get.call(obj), obj2);
     47 }
     48 TestNoPoisonPill();
     49 
     50 
     51 function TestRedefineObjectPrototypeProtoGetter() {
     52   Object.defineProperty(Object.prototype, "__proto__", {
     53     get: function() {
     54       return 42;
     55     }
     56   });
     57   assertEquals({}.__proto__, 42);
     58   assertEquals(desc.get.call({}), Object.prototype);
     59 
     60   var desc2 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
     61   assertEquals(desc2.get.call({}), 42);
     62   assertEquals(desc2.set.call({}), undefined);
     63 
     64   Object.defineProperty(Object.prototype, "__proto__", {
     65     set: function(x) {}
     66   });
     67   var desc3 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
     68   assertEquals(desc3.get.call({}), 42);
     69   assertEquals(desc3.set.call({}), undefined);
     70 }
     71 TestRedefineObjectPrototypeProtoGetter();
     72 
     73 
     74 function TestRedefineObjectPrototypeProtoSetter() {
     75   Object.defineProperty(Object.prototype, "__proto__", { set: undefined });
     76   assertThrows(function() {
     77     "use strict";
     78     var o = {};
     79     var p = {};
     80     o.__proto__ = p;
     81   }, TypeError);
     82 }
     83 TestRedefineObjectPrototypeProtoSetter();
     84 
     85 
     86 function TestGetProtoOfValues() {
     87   assertEquals(getProto.call(1), Number.prototype);
     88   assertEquals(getProto.call(true), Boolean.prototype);
     89   assertEquals(getProto.call(false), Boolean.prototype);
     90   assertEquals(getProto.call('s'), String.prototype);
     91   assertEquals(getProto.call(Symbol()), Symbol.prototype);
     92 
     93   assertThrows(function() { getProto.call(null); }, TypeError);
     94   assertThrows(function() { getProto.call(undefined); }, TypeError);
     95 }
     96 TestGetProtoOfValues();
     97 
     98 
     99 var values = [1, true, false, 's', Symbol()];
    100 
    101 
    102 function TestSetProtoOfValues() {
    103   var proto = {};
    104   for (var i = 0; i < values.length; i++) {
    105     assertEquals(setProto.call(values[i], proto), undefined);
    106   }
    107 
    108   assertThrows(function() { setProto.call(null, proto); }, TypeError);
    109   assertThrows(function() { setProto.call(undefined, proto); }, TypeError);
    110 }
    111 TestSetProtoOfValues();
    112 
    113 
    114 function TestSetProtoToValue() {
    115   var object = {};
    116   var proto = {};
    117   setProto.call(object, proto);
    118 
    119   var valuesWithUndefined = values.concat(undefined);
    120 
    121   for (var i = 0; i < valuesWithUndefined.length; i++) {
    122     assertEquals(setProto.call(object, valuesWithUndefined[i]), undefined);
    123     assertEquals(getProto.call(object), proto);
    124   }
    125 
    126   // null is the only valid value that can be used as a [[Prototype]].
    127   assertEquals(setProto.call(object, null), undefined);
    128   assertEquals(getProto.call(object), null);
    129 }
    130 TestSetProtoToValue();
    131 
    132 
    133 function TestDeleteProto() {
    134   assertTrue(delete Object.prototype.__proto__);
    135   var o = {};
    136   var p = {};
    137   o.__proto__ = p;
    138   assertEquals(Object.getPrototypeOf(o), Object.prototype);
    139   var desc4 = Object.getOwnPropertyDescriptor(o, "__proto__");
    140   assertTrue(desc4.configurable);
    141   assertTrue(desc4.enumerable);
    142   assertTrue(desc4.writable);
    143   assertEquals(desc4.value, p);
    144 }
    145 TestDeleteProto();
    146