test/mjsunit/regress/regress-91517.js

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// Getting property names of an object with a prototype chain that
// triggers dictionary elements in GetLocalPropertyNames() shouldn't
// crash the runtime

// Flags: --allow-natives-syntax

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

function Object2() {
  this.fuz = 2;
  this.objects = new Object();
  this.fuz1 = 2;
  this.fuz2 = 2;
  this.fuz3 = 2;
  this.fuz4 = 2;
  this.fuz5 = 2;
  this.fuz6 = 2;
  this.fuz7 = 2;
  this.fuz8 = 2;
  this.fuz9 = 2;
  this.fuz10 = 2;
  this.fuz11 = 2;
  this.fuz12 = 2;
  this.fuz13 = 2;
  this.fuz14 = 2;
  this.fuz15 = 2;
  this.fuz16 = 2;
  this.fuz17 = 2;
  // Force dictionary-based properties
  for (x=1;x<1000;x++) {
    this["sdf" + x] = 2;
  }
}

function Object3() {
  this.boo = 3;
}

function Object4() {
  this.baz = 4;
}

obj1 = new Object1();
obj2 = new Object2();
obj3 = new Object3();
obj4 = new Object4();

%SetHiddenPrototype(obj4, obj3);
%SetHiddenPrototype(obj3, obj2);
%SetHiddenPrototype(obj2, obj1);

function contains(a, obj) {
  for(var i = 0; i < a.length; i++) {
    if(a[i] === obj){
      return true;
    }
  }
  return false;
}
names = %GetLocalPropertyNames(obj4);
assertEquals(1021, names.length);
assertTrue(contains(names, "baz"));
assertTrue(contains(names, "boo"));
assertTrue(contains(names, "foo"));
assertTrue(contains(names, "fuz"));
assertTrue(contains(names, "fuz1"));
assertTrue(contains(names, "fuz2"));
assertTrue(contains(names, "fuz3"));
assertTrue(contains(names, "fuz4"));
assertTrue(contains(names, "fuz5"));
assertTrue(contains(names, "fuz6"));
assertTrue(contains(names, "fuz7"));
assertTrue(contains(names, "fuz8"));
assertTrue(contains(names, "fuz9"));
assertTrue(contains(names, "fuz10"));
assertTrue(contains(names, "fuz11"));
assertTrue(contains(names, "fuz12"));
assertTrue(contains(names, "fuz13"));
assertTrue(contains(names, "fuz14"));
assertTrue(contains(names, "fuz15"));
assertTrue(contains(names, "fuz16"));
assertTrue(contains(names, "fuz17"));
assertFalse(names[1020] == undefined);