function foo(o) { return o.f; } noInline(foo); var counter = 0; function test(o, expected, expectedCount) { var result = foo(o); if (result != expected) throw new Error("Bad result: " + result); if (counter != expectedCount) throw new Error("Bad counter value: " + counter); } function getter() { counter++; return 84; } for (var i = 0; i < 100000; ++i) { var o = {}; o.__defineGetter__("f", getter); test(o, 84, counter + 1); var o = {}; o.__defineGetter__("f", getter); o.g = 54; test(o, 84, counter + 1); }