tor-browser

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

resolve-from-same-thenable.js (2390B)

      1 // Copyright (C) 2015 André Bargull. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 
      4 /*---
      5 es6id: 25.4.4.1.1
      6 description: >
      7  Cannot tamper remainingElementsCount when Promise.all resolve element function is called multiple times.
      8 info: |
      9  Runtime Semantics: PerformPromiseAll( iteratorRecord, constructor, resultCapability)
     10 
     11  ...
     12  4. Let remainingElementsCount be a new Record { [[value]]: 1 }.
     13  ...
     14  6.d ...
     15    ii. Set remainingElementsCount.[[value]] to remainingElementsCount.[[value]] − 1.
     16    iii. If remainingElementsCount.[[value]] is 0,
     17      1. Let valuesArray be CreateArrayFromList(values).
     18      2. Let resolveResult be Call(resultCapability.[[Resolve]], undefined, «valuesArray»).
     19      3. ReturnIfAbrupt(resolveResult).
     20  ...
     21 
     22  25.4.4.1.2 Promise.all Resolve Element Functions
     23    1. Let alreadyCalled be the value of F's [[AlreadyCalled]] internal slot.
     24    2. If alreadyCalled.[[value]] is true, return undefined.
     25    3. Set alreadyCalled.[[value]] to true.
     26    ...
     27 ---*/
     28 
     29 var callCount = 0;
     30 
     31 function Constructor(executor) {
     32  function resolve(values) {
     33    callCount += 1;
     34    assert(Array.isArray(values, "values is array"));
     35    assert.sameValue(values.length, 3, "values length");
     36    assert.sameValue(values[0], "p1-fulfill", "values[0]");
     37    assert.sameValue(values[1], "p2-fulfill", "values[1]");
     38    assert.sameValue(values[2], "p3-fulfill", "values[2]");
     39  }
     40  executor(resolve, Test262Error.thrower);
     41 }
     42 Constructor.resolve = function(v) {
     43  return v;
     44 };
     45 
     46 var p1OnFulfilled, p2OnFulfilled, p3OnFulfilled;
     47 
     48 var p1 = {
     49  then: function(onFulfilled, onRejected) {
     50    p1OnFulfilled = onFulfilled;
     51  }
     52 };
     53 var p2 = {
     54  then: function(onFulfilled, onRejected) {
     55    p2OnFulfilled = onFulfilled;
     56  }
     57 };
     58 var p3 = {
     59  then: function(onFulfilled, onRejected) {
     60    p3OnFulfilled = onFulfilled;
     61  }
     62 };
     63 
     64 assert.sameValue(callCount, 0, "callCount before call to all()");
     65 
     66 Promise.all.call(Constructor, [p1, p2, p3]);
     67 
     68 assert.sameValue(callCount, 0, "callCount after call to all()");
     69 
     70 p1OnFulfilled("p1-fulfill");
     71 p1OnFulfilled("p1-fulfill-unexpected-1");
     72 p1OnFulfilled("p1-fulfill-unexpected-2");
     73 
     74 assert.sameValue(callCount, 0, "callCount after resolving p1");
     75 
     76 p2OnFulfilled("p2-fulfill");
     77 p3OnFulfilled("p3-fulfill");
     78 
     79 assert.sameValue(callCount, 1, "callCount after resolving all elements");
     80 
     81 reportCompare(0, 0);