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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 function TestSetProtoValueCyclic() {
     33   var objects = [
     34     Object.prototype, {},
     35     Array.prototype, [],
     36     Error.prototype, new TypeError,
     37     // etc ...
     38   ];
     39   for (var i = 0; i < objects.length; i += 2) {
     40     var object = objects[i];
     41     var value = objects[i + 1];
     42     assertThrows(function() {
     43       object.__proto__ = value;
     44     }, TypeError);
     45   }
     46 };
     47 TestSetProtoValueCyclic();
     48 
     49 
     50 var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
     51 var getProto = desc.get;
     52 var setProto = desc.set;
     53 
     54 function TestNoPoisonPill() {
     55   assertEquals("function", typeof desc.get);
     56   assertEquals("function", typeof desc.set);
     57   assertDoesNotThrow("desc.get.call({})");
     58   assertDoesNotThrow("desc.set.call({}, {})");
     59 
     60   var obj = {};
     61   var obj2 = {};
     62   desc.set.call(obj, obj2);
     63   assertEquals(obj.__proto__, obj2);
     64   assertEquals(desc.get.call(obj), obj2);
     65 }
     66 TestNoPoisonPill();
     67 
     68 
     69 function TestRedefineObjectPrototypeProtoGetter() {
     70   Object.defineProperty(Object.prototype, "__proto__", {
     71     get: function() {
     72       return 42;
     73     }
     74   });
     75   assertEquals({}.__proto__, 42);
     76   assertEquals(desc.get.call({}), Object.prototype);
     77 
     78   var desc2 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
     79   assertEquals(desc2.get.call({}), 42);
     80   assertEquals(desc2.set.call({}), undefined);
     81 
     82   Object.defineProperty(Object.prototype, "__proto__", {
     83     set: function(x) {}
     84   });
     85   var desc3 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
     86   assertEquals(desc3.get.call({}), 42);
     87   assertEquals(desc3.set.call({}), undefined);
     88 }
     89 TestRedefineObjectPrototypeProtoGetter();
     90 
     91 
     92 function TestRedefineObjectPrototypeProtoSetter() {
     93   Object.defineProperty(Object.prototype, "__proto__", { set: undefined });
     94   assertThrows(function() {
     95     "use strict";
     96     var o = {};
     97     var p = {};
     98     o.__proto__ = p;
     99   }, TypeError);
    100 }
    101 TestRedefineObjectPrototypeProtoSetter();
    102 
    103 
    104 function TestGetProtoOfValues() {
    105   assertEquals(getProto.call(1), Number.prototype);
    106   assertEquals(getProto.call(true), Boolean.prototype);
    107   assertEquals(getProto.call(false), Boolean.prototype);
    108   assertEquals(getProto.call('s'), String.prototype);
    109   assertEquals(getProto.call(Symbol()), Symbol.prototype);
    110 
    111   assertThrows(function() { getProto.call(null); }, TypeError);
    112   assertThrows(function() { getProto.call(undefined); }, TypeError);
    113 }
    114 TestGetProtoOfValues();
    115 
    116 
    117 var values = [1, true, false, 's', Symbol()];
    118 
    119 
    120 function TestSetProtoOfValues() {
    121   var proto = {};
    122   for (var i = 0; i < values.length; i++) {
    123     assertEquals(setProto.call(values[i], proto), undefined);
    124   }
    125 
    126   assertThrows(function() { setProto.call(null, proto); }, TypeError);
    127   assertThrows(function() { setProto.call(undefined, proto); }, TypeError);
    128 }
    129 TestSetProtoOfValues();
    130 
    131 
    132 function TestSetProtoToValue() {
    133   var object = {};
    134   var proto = {};
    135   setProto.call(object, proto);
    136 
    137   var valuesWithUndefined = values.concat(undefined);
    138 
    139   for (var i = 0; i < valuesWithUndefined.length; i++) {
    140     assertEquals(setProto.call(object, valuesWithUndefined[i]), undefined);
    141     assertEquals(getProto.call(object), proto);
    142   }
    143 
    144   // null is the only valid value that can be used as a [[Prototype]].
    145   assertEquals(setProto.call(object, null), undefined);
    146   assertEquals(getProto.call(object), null);
    147 }
    148 TestSetProtoToValue();
    149 
    150 
    151 function TestDeleteProto() {
    152   assertTrue(delete Object.prototype.__proto__);
    153   var o = {};
    154   var p = {};
    155   o.__proto__ = p;
    156   assertEquals(Object.getPrototypeOf(o), Object.prototype);
    157   var desc4 = Object.getOwnPropertyDescriptor(o, "__proto__");
    158   assertTrue(desc4.configurable);
    159   assertTrue(desc4.enumerable);
    160   assertTrue(desc4.writable);
    161   assertEquals(desc4.value, p);
    162 }
    163 TestDeleteProto();
    164