tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

resolve-poisoned-then.js (1951B)

      1 // |reftest| async
      2 // Copyright (C) 2016 the V8 project authors. All rights reserved.
      3 // This code is governed by the BSD license found in the LICENSE file.
      4 /*---
      5 description: Resolving with an object with a "poisoned" `then` property
      6 es6id: 25.4.4.1
      7 info: |
      8    [...]
      9    6. Let promiseCapability be NewPromiseCapability(C).
     10    [...]
     11    11. Let result be PerformPromiseAll(iteratorRecord, C, promiseCapability).
     12    [...]
     13 
     14    25.4.4.1.1 Runtime Semantics: PerformPromiseAll
     15    [...]
     16    6. Repeat
     17       [...]
     18       d. If next is false,
     19          [...]
     20          iii. If remainingElementsCount.[[value]] is 0,
     21             1. Let valuesArray be CreateArrayFromList(values).
     22             2. Let resolveResult be Call(resultCapability.[[Resolve]],
     23                undefined, «valuesArray»).
     24             3. ReturnIfAbrupt(resolveResult)
     25          iv. Return resultCapability.[[Promise]].
     26 
     27    7.3.16 CreateArrayFromList (elements)
     28    [...]
     29    2. Let array be ArrayCreate(0) (see 9.4.2.2).
     30 
     31    9.4.2.2 ArrayCreate(length, proto)
     32    [...]
     33    4. If the proto argument was not passed, let proto be the intrinsic object
     34       %ArrayPrototype%.
     35    5. Let A be a newly created Array exotic object.
     36    [...]
     37    8. Set the [[Prototype]] internal slot of A to proto.
     38 
     39    25.4.1.3.2 Promise Resolve Functions
     40    [...]
     41    8. Let then be Get(resolution, "then").
     42    9. If then is an abrupt completion, then
     43       a. Return RejectPromise(promise, then.[[value]]).
     44 flags: [async]
     45 ---*/
     46 
     47 var value = {};
     48 var promise;
     49 
     50 try {
     51  Object.defineProperty(Array.prototype, 'then', {
     52    get: function() {
     53      throw value;
     54    },
     55    configurable: true
     56  });
     57 
     58  promise = Promise.all([]);
     59 } finally {
     60  delete Array.prototype.then;
     61 }
     62 
     63 promise.then(function() {
     64  $DONE('The promise should not be fulfilled.');
     65 }, function(val) {
     66  if (val !== value) {
     67    $DONE('The promise should be rejected with the expected value.');
     68    return;
     69  }
     70 
     71  $DONE();
     72 });