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star-rhs-iter-thrw-violation-rtrn-get-err.js (2045B)

      1 // Copyright (C) 2016 the V8 project authors. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 esid: sec-generator-function-definitions-runtime-semantics-evaluation
      5 es6id: 14.4.14
      6 description: >
      7  Abrupt completion returned when accessing iterator `return` property after
      8  protocol violation
      9 info: |
     10  YieldExpression : yield * AssignmentExpression
     11 
     12  1. Let exprRef be the result of evaluating AssignmentExpression.
     13  2. Let value be ? GetValue(exprRef).
     14  3. Let iterator be ? GetIterator(value).
     15  4. Let received be NormalCompletion(undefined).
     16  5. Repeat
     17     a. If received.[[Type]] is normal, then
     18        [...]
     19     b. Else if received.[[Type]] is throw, then
     20        i. Let throw be ? GetMethod(iterator, "throw").
     21        ii. If throw is not undefined, then
     22            [...]
     23        iii. Else,
     24             1. NOTE: If iterator does not have a throw method, this throw is
     25                going to terminate the yield* loop. But first we need to give
     26                iterator a chance to clean up.
     27             2. Perform ? IteratorClose(iterator, Completion{[[Type]]: normal,
     28                [[Value]]: empty, [[Target]]: empty}).
     29 
     30  7.4.6 IteratorClose
     31 
     32  1. Assert: Type(iterator) is Object.
     33  2. Assert: completion is a Completion Record.
     34  3. Let return be ? GetMethod(iterator, "return").
     35 features: [generators, Symbol.iterator]
     36 ---*/
     37 
     38 var thrown = new Test262Error();
     39 var badIter = {};
     40 var callCount = 0;
     41 var poisonedReturn = {
     42  next: function() {
     43    return { done: false };
     44  }
     45 };
     46 Object.defineProperty(poisonedReturn, 'throw', {
     47  get: function() {
     48    callCount += 1;
     49  }
     50 });
     51 Object.defineProperty(poisonedReturn, 'return', {
     52  get: function() {
     53    throw thrown;
     54  }
     55 });
     56 badIter[Symbol.iterator] = function() {
     57  return poisonedReturn;
     58 };
     59 function* g() {
     60  try {
     61    yield * badIter;
     62  } catch (err) {
     63    caught = err;
     64  }
     65 }
     66 var iter = g();
     67 var caught;
     68 
     69 iter.next();
     70 iter.throw();
     71 
     72 assert.sameValue(callCount, 1);
     73 assert.sameValue(caught, thrown);
     74 
     75 reportCompare(0, 0);