third_party/WebKit/LayoutTests/fast/js/pic/cached-getter-dictionary-and-proto.html

   1 <p>
   2 This page tests cached access to properties of dictionary objects and objects
   3 with changing prototypes. If the test passes, you'll see a series of PASS messages
   4 below.
   5 </p>
   6
   7 <pre id="console"></pre>
   8
   9 <script>
  10 (function() {
  11     if (window.testRunner)
  12         testRunner.dumpAsText();
  13
  14     function log(s)
  15     {
  16         if (this.document)
  17             document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
  18         else
  19             print(s + "\n");
  20     }
  21
  22     function shouldBe(a, aDescription, b)
  23     {
  24         if (a === b) {
  25             log("PASS: " + aDescription + " should be " + b + " and is.\n");
  26         } else {
  27             log("FAIL: " + aDescription + " should be " + b + " but instead is " + a + ".\n");
  28         }
  29     }
  30
  31     (function() {
  32         function getX(o)
  33         {
  34             return o.x;
  35         }
  36
  37         var o = {
  38             x: 0,
  39             y: 0
  40         };
  41
  42         getX(o);
  43         getX(o);
  44
  45         for (var i = 0; i < 128; ++i)
  46             o["p" + i] = 1;
  47
  48         shouldBe(getX(o), "getX(o)", 0);
  49     })();
  50
  51     (function() {
  52         function getProtoX(o)
  53         {
  54             return o.protoX;
  55         }
  56
  57         var o = {
  58             __proto__ : {
  59                 protoX: 0,
  60                 protoY: 0
  61             },
  62         };
  63
  64         getProtoX(o);
  65         getProtoX(o);
  66
  67         o.__proto__ = {
  68             protoY: 1,
  69             protoX: 2
  70         };
  71
  72         shouldBe(getProtoX(o), "getProtoX(o)", 2);
  73     })();
  74
  75     (function() {
  76         function getProtoX(o)
  77         {
  78             return o.protoX;
  79         }
  80
  81         var o = {
  82             __proto__ : {
  83                 protoX: 0,
  84                 protoY: 0
  85             },
  86         };
  87
  88         getProtoX(o);
  89         getProtoX(o);
  90
  91         delete o.__proto__.protoX;
  92
  93         shouldBe(getProtoX(o), "getProtoX(o)", undefined);
  94     })();
  95 })();
  96 </script>