| // Copyright (C) 2015 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-proxy-object-internal-methods-and-internal-slots-setprototypeof-v |
| description: > |
| Handler can only return true for non-extensible targets if the given prototype |
| is the same as target's prototype |
| info: | |
| [[SetPrototypeOf]] (V) |
| |
| 12. Let targetProto be ? target.[[GetPrototypeOf]](). |
| 13. If SameValue(V, targetProto) is false, throw a TypeError exception. |
| 14. Return true. |
| features: [Proxy, Reflect, Reflect.setPrototypeOf] |
| ---*/ |
| |
| var proto = {}; |
| var target = Object.setPrototypeOf({}, proto); |
| |
| Object.preventExtensions(target); |
| |
| var proxy; |
| |
| proxy = new Proxy(target, { |
| setPrototypeOf: function() { |
| return true; |
| } |
| }); |
| |
| assert.sameValue( |
| Reflect.setPrototypeOf(proxy, proto), |
| true, |
| "prototype arg is the same in target" |
| ); |
| |
| var outro = {}; |
| proxy = new Proxy(outro, { |
| setPrototypeOf: function(t, p) { |
| Object.setPrototypeOf(t, p); |
| Object.preventExtensions(t); |
| return true; |
| } |
| }); |
| |
| assert.sameValue( |
| Reflect.setPrototypeOf(proxy, proto), |
| true, |
| "prototype is set to target inside handler trap" |
| ); |
| assert.sameValue( |
| Object.getPrototypeOf(outro), |
| proto, |
| "target has the custom set prototype" |
| ); |