tests/stress/for-in-delete-during-iteration.js

   1 (function() {
   2     // Remove a yet-to-be-visited indexed property during iteration.
   3     var foo = function() {
   4         var a = [1, 2, 3, 4, 5];
   5         var result = "";
   6         for (var p in a) {
   7             if (p == 2)
   8                 delete a[3];
   9             result += a[p];
  10         }
  11         return result;
  12     };
  13     noInline(foo);
  14     for (var i = 0; i < 10000; ++i) {
  15         if (foo() !== "1235")
  16             throw new Error("bad result");
  17     }
  18     foo(null);
  19 })();
  20 (function() {
  21     // Remove a yet-to-be-visited non-indexed property during iteration.
  22     var foo = function() {
  23         var o = {};
  24         o.x = "x";
  25         o.y = "y";
  26         o.z = "z";
  27         var result = "";
  28         for (var p in o) {
  29             if (p == "x") {
  30                 delete o.y;
  31                 o.a = "a";
  32             }
  33             result += o[p];
  34         }
  35         return result;
  36     };
  37     noInline(foo);
  38     for (var i = 0; i < 10000; ++i) {
  39         if (foo() !== "xz")
  40             throw new Error("bad result");
  41     }
  42 })();
  43 (function() {
  44     // Remove then re-add a property during iteration.
  45     var foo = function() {
  46         var A = function() {};
  47         A.prototype.x = "A.x";
  48         A.prototype.y = "A.y";
  49         var o = new A();
  50         o.z = "o.z";
  51         o.y = "o.y";
  52         o.x = "o.x";
  53         var result = "";
  54         for (var p in o) {
  55             if (p == "z")
  56                 delete o.x;
  57             if (p == "y")
  58                 o.x = "o.x";
  59             result += o[p];
  60         }
  61         return result;
  62     };
  63     noInline(foo);
  64     for (var i = 0; i < 10000; ++i) {
  65         if (foo() !== "o.zo.yo.x")
  66             throw new Error("bad result");
  67     }
  68     foo(null);
  69 })();