function foo(o, value) { o.f = value; return o.f; } noInline(foo); var counter = 0; function test(o, value, expectedCount) { var result = foo(o, value); if (result != value) throw new Error("Bad result: " + result); if (counter != expectedCount) throw new Error("Bad counter value: " + counter); } for (var i = 0; i < 100000; ++i) { var o = {}; o.__defineSetter__("f", function(value) { counter++; this._f = value; }); o.__defineGetter__("f", function() { return this._f; }); test(o, i, counter + 1); test({f: 42}, i, counter); }