The Tor Browser / file revision

 //Benchmark to measure overhead of dslots allocation and deallocation

 function Object0() {};

 function Object1() { this.a=1; };

 function Object2() { this.a=1; this.b=1; };

 function Object3() { this.a=1; this.b=1; this.c=1; };

 function Object4() { this.a=1; this.b=1; this.c=1; this.d=1; };

 function Object5() { this.a=1; this.b=1; this.c=1; this.d=1; this.e=1; };

 function test() {

     var N = 1e5;

     gc();

     for(var i = 0; i<=5; i++)

     {

         var tmp = i==0 ? Object0 : i==1 ? Object1 : i==2 ? Object2 : i==3 ? Object3 : i==4 ? Object4 : Object5;

         for (var j = 0; j != N; j++) {

             var a = new tmp();

         }

         gc();

     }

 }

 for(var i = 0; i<=5; i++) {

     test();

 }