| // Copyright (C) 2015 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| es6id: 9.5.2 |
| description: > |
| Throws a TypeError exception if boolean trap result is true, target is |
| not extensible, and the given parameter is not the same object as the target |
| prototype. |
| info: | |
| [[SetPrototypeOf]] (V) |
| |
| ... |
| 2. Let handler be the value of the [[ProxyHandler]] internal slot of O. |
| ... |
| 5. Let target be the value of the [[ProxyTarget]] internal slot of O. |
| 6. Let trap be GetMethod(handler, "setPrototypeOf"). |
| ... |
| 9. Let booleanTrapResult be ToBoolean(Call(trap, handler, «target, V»)). |
| 14. Let targetProto be target.[[GetPrototypeOf]](). |
| 15. ReturnIfAbrupt(targetProto). |
| 16. If booleanTrapResult is true and SameValue(V, targetProto) is false, |
| throw a TypeError exception. |
| ... |
| features: [Proxy, Reflect, Reflect.setPrototypeOf] |
| ---*/ |
| |
| var target, proxy; |
| target = {}; |
| proxy = new Proxy(target, { |
| setPrototypeOf: function() { |
| return true; |
| } |
| }); |
| |
| Object.preventExtensions(target); |
| |
| assert.throws(TypeError, function() { |
| Reflect.setPrototypeOf(proxy, {}); |
| }, "target prototype is different"); |
| |
| var proto = {}; |
| target = Object.setPrototypeOf({}, proto); |
| proxy = new Proxy(target, { |
| setPrototypeOf: function() { |
| Object.setPrototypeOf(target, {}); |
| Object.preventExtensions(target); |
| return true; |
| } |
| }); |
| |
| assert.throws(TypeError, function() { |
| Reflect.setPrototypeOf(proxy, proto); |
| }, "target prototype is changed inside trap handler"); |