proto-from-ctor-realm.js (2484B)
1 // Copyright (C) 2019 Alexey Shvayka. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 esid: sec-async-function-constructor-arguments 6 description: Default [[Prototype]] value derived from realm of the NewTarget. 7 info: | 8 AsyncFunction ( p1, p2, … , pn, body ) 9 10 ... 11 3. Return CreateDynamicFunction(C, NewTarget, "async", args). 12 13 Runtime Semantics: CreateDynamicFunction ( constructor, newTarget, kind, args ) 14 15 ... 16 9. Else if kind is "async", then 17 ... 18 c. Let fallbackProto be "%AsyncFunction.prototype%". 19 ... 20 18. Let proto be ? GetPrototypeFromConstructor(newTarget, fallbackProto). 21 ... 22 23 GetPrototypeFromConstructor ( constructor, intrinsicDefaultProto ) 24 25 ... 26 3. Let proto be ? Get(constructor, "prototype"). 27 4. If Type(proto) is not Object, then 28 a. Let realm be ? GetFunctionRealm(constructor). 29 b. Set proto to realm's intrinsic object named intrinsicDefaultProto. 30 5. Return proto. 31 features: [async-functions, cross-realm, Reflect, Symbol] 32 ---*/ 33 34 var AsyncFunction = Object.getPrototypeOf(async function() {}).constructor; 35 var other = $262.createRealm().global; 36 var OtherAsyncFunction = Object.getPrototypeOf(other.eval('(0, async function() {})')).constructor; 37 var newTarget = new other.Function(); 38 var fn; 39 40 newTarget.prototype = undefined; 41 fn = Reflect.construct(AsyncFunction, [], newTarget); 42 assert.sameValue(Object.getPrototypeOf(fn), OtherAsyncFunction.prototype, 'newTarget.prototype is undefined'); 43 44 newTarget.prototype = null; 45 fn = Reflect.construct(AsyncFunction, [], newTarget); 46 assert.sameValue(Object.getPrototypeOf(fn), OtherAsyncFunction.prototype, 'newTarget.prototype is null'); 47 48 newTarget.prototype = true; 49 fn = Reflect.construct(AsyncFunction, [], newTarget); 50 assert.sameValue(Object.getPrototypeOf(fn), OtherAsyncFunction.prototype, 'newTarget.prototype is a Boolean'); 51 52 newTarget.prototype = ''; 53 fn = Reflect.construct(AsyncFunction, [], newTarget); 54 assert.sameValue(Object.getPrototypeOf(fn), OtherAsyncFunction.prototype, 'newTarget.prototype is a String'); 55 56 newTarget.prototype = Symbol(); 57 fn = Reflect.construct(AsyncFunction, [], newTarget); 58 assert.sameValue(Object.getPrototypeOf(fn), OtherAsyncFunction.prototype, 'newTarget.prototype is a Symbol'); 59 60 newTarget.prototype = 1; 61 fn = Reflect.construct(AsyncFunction, [], newTarget); 62 assert.sameValue(Object.getPrototypeOf(fn), OtherAsyncFunction.prototype, 'newTarget.prototype is a Number'); 63 64 reportCompare(0, 0);