| // Copyright (C) 2020 Alexey Shvayka. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-createdynamicfunction |
| description: > |
| While default [[Prototype]] value derives from realm of the newTarget, |
| "prototype" object inherits from %Object.prototype% of constructor's realm. |
| info: | |
| AsyncGeneratorFunction ( p1, p2, … , pn, body ) |
| |
| [...] |
| 3. Return ? CreateDynamicFunction(C, NewTarget, asyncGenerator, args). |
| |
| CreateDynamicFunction ( constructor, newTarget, kind, args ) |
| |
| [...] |
| 18. Let proto be ? GetPrototypeFromConstructor(newTarget, fallbackProto). |
| 19. Let realmF be the current Realm Record. |
| 20. Let scope be realmF.[[GlobalEnv]]. |
| 21. Let F be ! OrdinaryFunctionCreate(proto, parameters, body, non-lexical-this, scope). |
| [...] |
| 24. Else if kind is asyncGenerator, then |
| a. Let prototype be OrdinaryObjectCreate(%AsyncGenerator.prototype%). |
| b. Perform DefinePropertyOrThrow(F, "prototype", PropertyDescriptor { [[Value]]: |
| prototype, [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: false }). |
| [...] |
| 30. Return F. |
| features: [async-iteration, cross-realm, Reflect] |
| ---*/ |
| |
| var realmA = $262.createRealm().global; |
| realmA.calls = 0; |
| var aAsyncGeneratorFunction = realmA.eval("(async function* () {})").constructor; |
| var aAsyncGeneratorPrototype = Object.getPrototypeOf( |
| realmA.eval("(async function* () {})").prototype |
| ); |
| |
| var realmB = $262.createRealm().global; |
| var bAsyncGeneratorFunction = realmB.eval("(async function* () {})").constructor; |
| var newTarget = new realmB.Function(); |
| newTarget.prototype = null; |
| |
| var fn = Reflect.construct(aAsyncGeneratorFunction, ["calls += 1;"], newTarget); |
| assert.sameValue(Object.getPrototypeOf(fn), bAsyncGeneratorFunction.prototype); |
| assert.sameValue(Object.getPrototypeOf(fn.prototype), aAsyncGeneratorPrototype); |
| |
| var gen = fn(); |
| assert(gen instanceof realmA.Object); |
| gen.next(); |
| assert.sameValue(realmA.calls, 1); |