is-optimizable/test/problems.js

A tool that checks for V8 optimization killers

debugger;

function a() {
  debugger;
}

function* test() {
}

(function* () {
}());

for (let i of [3, 5, 7]) {
}

try {} finally {}
try {} catch (err) {}
try {} catch (err) {} finally {}

var x = {
  get prop() {
    return 3;
  },
  set prop(val) {
    this.val = val;
  },
  __proto__: 3,
  "test": 4,
}

eval('1 + 1');
window.eval('2 + 2');

with ({a: 1}) {
  console.log(a);
}

switch(c) {
  case 1: break;
  case 2: break;
  case 3: break;
  case 4: break;
  case 5: break;
  case 6: break;
  case 7: break;
  case 8: break;
  case 9: break;
  case 10: break;
  case 11: break;
  case 12: break;
  case 13: break;
  case 14: break;
  case 15: break;
  case 16: break;
  case 17: break;
  case 18: break;
  case 19: break;
  case 20: break;
  case 21: break;
  case 22: break;
  case 23: break;
  case 24: break;
  case 25: break;
  case 26: break;
  case 27: break;
  case 28: break;
  case 29: break;
  case 30: break;
  case 31: break;
  case 32: break;
  case 33: break;
  case 34: break;
  case 35: break;
  case 36: break;
  case 37: break;
  case 38: break;
  case 39: break;
  case 40: break;
  case 41: break;
  case 42: break;
  case 43: break;
  case 44: break;
  case 45: break;
  case 46: break;
  case 47: break;
  case 48: break;
  case 49: break;
  case 50: break;
  case 51: break;
  case 52: break;
  case 53: break;
  case 54: break;
  case 55: break;
  case 56: break;
  case 57: break;
  case 58: break;
  case 59: break;
  case 60: break;
  case 61: break;
  case 62: break;
  case 63: break;
  case 64: break;
  case 65: break;
  case 66: break;
  case 67: break;
  case 68: break;
  case 69: break;
  case 70: break;
  case 71: break;
  case 72: break;
  case 73: break;
  case 74: break;
  case 75: break;
  case 76: break;
  case 77: break;
  case 78: break;
  case 79: break;
  case 80: break;
  case 81: break;
  case 82: break;
  case 83: break;
  case 84: break;
  case 85: break;
  case 86: break;
  case 87: break;
  case 88: break;
  case 89: break;
  case 90: break;
  case 91: break;
  case 92: break;
  case 93: break;
  case 94: break;
  case 95: break;
  case 96: break;
  case 97: break;
  case 98: break;
  case 99: break;
  case 100: break;
  case 101: break;
  case 102: break;
  case 103: break;
  case 104: break;
  case 105: break;
  case 106: break;
  case 107: break;
  case 108: break;
  case 109: break;
  case 110: break;
  case 111: break;
  case 112: break;
  case 113: break;
  case 114: break;
  case 115: break;
  case 116: break;
  case 117: break;
  case 118: break;
  case 119: break;
  case 120: break;
  case 121: break;
  case 122: break;
  case 123: break;
  case 124: break;
  case 125: break;
  case 126: break;
  case 127: break;
  case 128: break;
  case 129: break;
}

/* is-optimizable ignore next */
try {} finally {}

function c() {
  // this is bad
  return arguments;
}

function d() {
  // this is ok
  return arguments.length;
}

function e() {
  // this is ok too
  return b.apply(null, arguments);
}

function f() {
  // this is bad
  var args = [].slice.call(arguments);
}

function f(a, b) {
  // bad
  a = 2;
  arguments[0];
}

function f() {
  // ok
  var args = new Array(arguments.length);
  for(var i = 0; i < args.length; ++i) {
    args[i] = arguments[i];
  }
  return args;
}

function g(a, b, c) {
  // bad - only at runtime it becomes clear if a, b & c are not
  // undefined
  return arguments[0];
}

function h() {
  // ok
  arguments;
}

function i() {
  // bad
  arguments = 3;
}

// add new tests at the end, to prevent line numbers from changing

// this file isn't jshinted since some bad performance things also make
// jshint scream.