michael@0: // Test corner cases of for-of iteration over Arrays.
michael@0: // The current spidermonkey JSOP_SPREAD implementation for function calls
michael@0: // with '...rest' arguments uses a ForOfIterator to extract values from
michael@0: // the array, so we use that mechanism to test ForOfIterator here.
michael@0: 
michael@0: //
michael@0: // Check array length increases changes during iteration.
michael@0: //
michael@0: function TestIncreaseArrayLength() {
michael@0:     function doIter(f, arr) {
michael@0:         return f(...arr)
michael@0:     }
michael@0: 
michael@0:     function fun(a, b, c) {
michael@0:         var result = 0;
michael@0:         for (var i = 0; i < arguments.length; i++)
michael@0:             result += arguments[i];
michael@0:         return result;
michael@0:     }
michael@0: 
michael@0:     var GET_COUNT = 0;
michael@0:     function getter() {
michael@0:         GET_COUNT++;
michael@0:         if (GET_COUNT == MID) {
michael@0:             ARR_SUM += arr.length;
michael@0:             arr.push(arr.length);
michael@0:         }
michael@0:         return M2;
michael@0:     }
michael@0: 
michael@0:     var iter = ([])['@@iterator']();
michael@0:     var iterProto = Object.getPrototypeOf(iter);
michael@0:     var OldNext = iterProto.next;
michael@0:     var NewNext = function () {
michael@0:         return OldNext.apply(this, arguments);
michael@0:     };
michael@0: 
michael@0:     var TRUE_SUM = 0;
michael@0:     var N = 100;
michael@0:     var MID = N/2;
michael@0:     var M = 3;
michael@0:     var arr = new Array(M);
michael@0:     var ARR_SUM = 0;
michael@0:     for (var j = 0; j < M; j++) {
michael@0:         arr[j] = j;
michael@0:         ARR_SUM += j;
michael@0:     }
michael@0:     var M2 = (M/2)|0;
michael@0:     Object.defineProperty(arr, M2, {'get':getter});
michael@0: 
michael@0:     var sum = 0;
michael@0:     for (var i = 0; i < N; i++) {
michael@0:         sum += doIter(fun, arr);
michael@0:         TRUE_SUM += ARR_SUM;
michael@0:     }
michael@0:     assertEq(sum, TRUE_SUM);
michael@0: }
michael@0: TestIncreaseArrayLength();
michael@0: 
michael@0: if (typeof reportCompare === "function")
michael@0:   reportCompare(true, true);