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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,
     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 function A() { }
     29 function B() { }
     30 function C() { }
     31 
     32 function NewC() {
     33   A.prototype = {};
     34   B.prototype = new A();
     35   C.prototype = new B();
     36   var result = new C();
     37   result.A = A.prototype;
     38   result.B = B.prototype;
     39   result.C = C.prototype;
     40   return result;
     41 }
     42 
     43 // Check that we can read properties defined in prototypes.
     44 var c = NewC();
     45 c.A.x = 1;
     46 c.B.y = 2;
     47 c.C.z = 3;
     48 assertEquals(1, c.x);
     49 assertEquals(2, c.y);
     50 assertEquals(3, c.z);
     51 
     52 var c = NewC();
     53 c.A.x = 0;
     54 for (var i = 0; i < 2; i++) {
     55   assertEquals(i, c.x);
     56   c.B.x = 1;
     57 }
     58 
     59 
     60 // Regression test:
     61 // Make sure we preserve the prototype of an object in the face of map transitions.
     62 
     63 function D() {
     64   this.d = 1;
     65 }
     66 var p = new Object();
     67 p.y = 1;
     68 new D();
     69 
     70 D.prototype = p
     71 assertEquals(1, (new D).y);
     72 
     73 
     74 // Regression test:
     75 // Make sure that arrays and functions in the prototype chain works;
     76 // check length.
     77 function X() { }
     78 function Y() { }
     79 
     80 X.prototype = function(a,b) { };
     81 Y.prototype = [1,2,3];
     82 
     83 assertEquals(2, (new X).length);
     84 assertEquals(3, (new Y).length);
     85 
     86 
     87 // Test setting the length of an object where the prototype is from an array.
     88 var test = new Object;
     89 test.__proto__ = (new Array()).__proto__;
     90 test.length = 14;
     91 assertEquals(14, test.length);
     92 
     93 
     94