| function shouldBe(actual, expected) { |
| if (actual !== expected) |
| throw new Error('bad value: ' + actual); |
| } |
| |
| function makePolyProtoObject() { |
| function foo() { |
| class C { |
| constructor() { |
| this._field = 42; |
| } |
| }; |
| return new C; |
| } |
| for (let i = 0; i < 15; ++i) |
| foo(); |
| return foo(); |
| } |
| |
| function target(object) |
| { |
| return object.__proto__; |
| } |
| noInline(target); |
| |
| var polyProtoObject = makePolyProtoObject(); |
| var prototype = Reflect.getPrototypeOf(polyProtoObject); |
| for (var i = 0; i < 1e5; ++i) |
| shouldBe(target(polyProtoObject), prototype); |
| |
| polyProtoObject.__proto__ = null |
| shouldBe(target(polyProtoObject), undefined) |
