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Diffstat (limited to 'js/src/tests/test262/language/expressions/yield/star-rhs-iter-thrw-res-done-no-value.js')
-rw-r--r-- | js/src/tests/test262/language/expressions/yield/star-rhs-iter-thrw-res-done-no-value.js | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/expressions/yield/star-rhs-iter-thrw-res-done-no-value.js b/js/src/tests/test262/language/expressions/yield/star-rhs-iter-thrw-res-done-no-value.js new file mode 100644 index 0000000000..ef844d38a8 --- /dev/null +++ b/js/src/tests/test262/language/expressions/yield/star-rhs-iter-thrw-res-done-no-value.js @@ -0,0 +1,78 @@ +// Copyright (C) 2016 the V8 project authors. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. +/*--- +esid: sec-generator-function-definitions-runtime-semantics-evaluation +description: > + `value` property is not accessed when iteration is complete +info: | + YieldExpression : yield * AssignmentExpression + + 1. Let exprRef be the result of evaluating AssignmentExpression. + 2. Let value be ? GetValue(exprRef). + 3. Let iterator be ? GetIterator(value). + 4. Let received be NormalCompletion(undefined). + 5. Repeat + a. If received.[[Type]] is normal, then + [...] + b. Else if received.[[Type]] is throw, then + i. Let throw be ? GetMethod(iterator, "throw"). + ii. If throw is not undefined, then + 1. Let innerResult be ? Call(throw, iterator, « received.[[Value]] + »). + 2. NOTE: Exceptions from the inner iterator throw method are + propagated. Normal completions from an inner throw method are + processed similarly to an inner next. + 3. If Type(innerResult) is not Object, throw a TypeError exception. + 4. Let done be ? IteratorComplete(innerResult). + 5. If done is true, then + a. Return ? IteratorValue(innerResult). + + 7.4.3 IteratorComplete + + 1. Assert: Type(iterResult) is Object. + 2. Return ToBoolean(? Get(iterResult, "done")). +features: [generators, Symbol.iterator] +---*/ + +var badIter = {}; +var callCount = 0; +var spyValue = Object.defineProperty({ done: false }, 'value', { + get: function() { + callCount += 1; + } +}); +badIter[Symbol.iterator] = function() { + return { + next: function() { + return { done: false }; + }, + throw: function() { + return spyValue; + } + }; +}; +var delegationComplete = false; +function* g() { + yield * badIter; + delegationComplete = true; +} +var iter = g(); + +iter.next(); +assert.sameValue(callCount, 0, 'access count (first iteration)'); +assert.sameValue( + delegationComplete, false, 'delegation ongoing (first iteration)' +); + +iter.throw(); +assert.sameValue(callCount, 0, 'access count (second iteration)'); +assert.sameValue( + delegationComplete, false, 'delegation ongoing (second iteration)' +); + +spyValue.done = true; +iter.throw(); +assert.sameValue(callCount, 1, 'access count (final iteration)'); +assert.sameValue(delegationComplete, true, 'delegation complete'); + +reportCompare(0, 0); |