spreadcall-not-optimized-static-6b.js (1061B)
1 // Tests when JSOP_OPTIMIZE_SPREADCALL can't be applied during the initial 2 // Ion compilation. 3 4 // JSOP_OPTIMIZE_SPREADCALL can be optimised when the following conditions 5 // are fulfilled: 6 // (1) the argument is an array 7 // (2) the array has no hole 8 // (3) array[@@iterator] is not modified 9 // (4) the array's prototype is Array.prototype 10 // (5) Array.prototype[@@iterator] is not modified 11 // (6) %ArrayIteratorPrototype%.next is not modified 12 13 function add(a, b) { 14 return a + b; 15 } 16 17 // %ArrayIteratorPrototype%.next was modified. 18 function test() { 19 var ArrayIteratorPrototype = Object.getPrototypeOf(Array.prototype[Symbol.iterator]()); 20 var ArrayIteratorPrototypeNext = ArrayIteratorPrototype.next; 21 ArrayIteratorPrototype.next = function() { 22 var res = ArrayIteratorPrototypeNext.call(this); 23 if (!res.done) { 24 res.value += 2; 25 } 26 return res; 27 }; 28 function fn(...rest) { 29 return add(...rest); 30 } 31 for (var i = 0; i < 2000; ++i) { 32 assertEq(fn(1, 2), 7); 33 } 34 } 35 test();