tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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resolve-from-same-thenable.js (2363B)

      1 // Copyright (C) 2019 Leo Balter. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 
      4 /*---
      5 esid: sec-performpromiseallsettled
      6 description: >
      7  Cannot tamper remainingElementsCount when Promise.allSettled resolve element function is called multiple times.
      8 info: |
      9  Runtime Semantics: PerformPromiseAllSettled ( iteratorRecord, constructor, resultCapability )
     10 
     11  4. Let remainingElementsCount be a new Record { [[Value]]: 1 }.
     12  ...
     13  6.d ...
     14    ii. Set remainingElementsCount.[[value]] to remainingElementsCount.[[value]] − 1.
     15    iii. If remainingElementsCount.[[value]] is 0, then
     16      1. Let valuesArray be CreateArrayFromList(values).
     17      2. Perform ? Call(resultCapability.[[Resolve]], undefined, « valuesArray »).
     18  ...
     19 
     20  Promise.allSettled Resolve Element Functions
     21 
     22  2. Let alreadyCalled be F.[[AlreadyCalled]].
     23  3. If alreadyCalled.[[Value]] is true, return undefined.
     24  4. Set alreadyCalled.[[Value]] to true.
     25  ...
     26 includes: [promiseHelper.js]
     27 features: [Promise.allSettled]
     28 ---*/
     29 
     30 var callCount = 0;
     31 
     32 function Constructor(executor) {
     33  function resolve(values) {
     34    callCount += 1;
     35    checkSettledPromises(values, [
     36      {
     37        status: 'fulfilled',
     38        value: 'p1-fulfill'
     39      },
     40      {
     41        status: 'fulfilled',
     42        value: 'p2-fulfill'
     43      },
     44      {
     45        status: 'fulfilled',
     46        value: 'p3-fulfill'
     47      }
     48    ], 'values');
     49  }
     50  executor(resolve, Test262Error.thrower);
     51 }
     52 Constructor.resolve = function(v) {
     53  return v;
     54 };
     55 
     56 var p1OnFulfilled, p2OnFulfilled, p3OnFulfilled;
     57 
     58 var p1 = {
     59  then(onFulfilled, onRejected) {
     60    p1OnFulfilled = onFulfilled;
     61  }
     62 };
     63 var p2 = {
     64  then(onFulfilled, onRejected) {
     65    p2OnFulfilled = onFulfilled;
     66  }
     67 };
     68 var p3 = {
     69  then(onFulfilled, onRejected) {
     70    p3OnFulfilled = onFulfilled;
     71  }
     72 };
     73 
     74 assert.sameValue(callCount, 0, 'callCount before call to allSettled()');
     75 
     76 Promise.allSettled.call(Constructor, [p1, p2, p3]);
     77 
     78 assert.sameValue(callCount, 0, 'callCount after call to allSettled()');
     79 
     80 p1OnFulfilled('p1-fulfill');
     81 p1OnFulfilled('p1-fulfill-unexpected-1');
     82 p1OnFulfilled('p1-fulfill-unexpected-2');
     83 
     84 assert.sameValue(callCount, 0, 'callCount after resolving p1');
     85 
     86 p2OnFulfilled('p2-fulfill');
     87 p3OnFulfilled('p3-fulfill');
     88 
     89 assert.sameValue(callCount, 1, 'callCount after resolving all elements');
     90 
     91 reportCompare(0, 0);