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      1 // Copyright 2008 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,
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     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 assertTrue({} instanceof Object);
     29 assertTrue([] instanceof Object);
     30 
     31 assertFalse({} instanceof Array);
     32 assertTrue([] instanceof Array);
     33 
     34 function TestChains() {
     35   var A = {};
     36   var B = {};
     37   var C = {};
     38   B.__proto__ = A;
     39   C.__proto__ = B;
     40 
     41   function F() { }
     42   F.prototype = A;
     43   assertTrue(C instanceof F);
     44   assertTrue(B instanceof F);
     45   assertFalse(A instanceof F);
     46 
     47   F.prototype = B;
     48   assertTrue(C instanceof F);
     49   assertFalse(B instanceof F);
     50   assertFalse(A instanceof F);
     51 
     52   F.prototype = C;
     53   assertFalse(C instanceof F);
     54   assertFalse(B instanceof F);
     55   assertFalse(A instanceof F);
     56 }
     57 
     58 TestChains();
     59 
     60 
     61 function TestExceptions() {
     62   function F() { }
     63   var items = [ 1, new Number(42), 
     64                 true, 
     65                 'string', new String('hest'),
     66                 {}, [], 
     67                 F, new F(),
     68                 Object, String ];
     69 
     70   var exceptions = 0;
     71   var instanceofs = 0;
     72 
     73   for (var i = 0; i < items.length; i++) {
     74     for (var j = 0; j < items.length; j++) {
     75       try {
     76         if (items[i] instanceof items[j]) instanceofs++;
     77       } catch (e) {
     78         assertTrue(e instanceof TypeError);
     79         exceptions++;
     80       }
     81     }
     82   }
     83   assertEquals(10, instanceofs);
     84   assertEquals(88, exceptions);
     85 
     86   // Make sure to throw an exception if the function prototype
     87   // isn't a proper JavaScript object.
     88   function G() { }
     89   G.prototype = undefined;
     90   assertThrows("({} instanceof G)");
     91 }
     92 
     93 TestExceptions();
     94