test/mjsunit/arguments.js

// Copyright 2011 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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function argc0() {
  return arguments.length;
}

function argc1(i) {
  return arguments.length;
}

function argc2(i, j) {
  return arguments.length;
}

assertEquals(0, argc0());
assertEquals(1, argc0(1));
assertEquals(2, argc0(1, 2));
assertEquals(3, argc0(1, 2, 3));
assertEquals(0, argc1());
assertEquals(1, argc1(1));
assertEquals(2, argc1(1, 2));
assertEquals(3, argc1(1, 2, 3));
assertEquals(0, argc2());
assertEquals(1, argc2(1));
assertEquals(2, argc2(1, 2));
assertEquals(3, argc2(1, 2, 3));

var index;

function argv0() {
  return arguments[index];
}

function argv1(i) {
  return arguments[index];
}

function argv2(i, j) {
  return arguments[index];
}

index = 0;
assertEquals(7, argv0(7));
assertEquals(7, argv0(7, 8));
assertEquals(7, argv0(7, 8, 9));
assertEquals(7, argv1(7));
assertEquals(7, argv1(7, 8));
assertEquals(7, argv1(7, 8, 9));
assertEquals(7, argv2(7));
assertEquals(7, argv2(7, 8));
assertEquals(7, argv2(7, 8, 9));

index = 1;
assertEquals(8, argv0(7, 8));
assertEquals(8, argv0(7, 8));
assertEquals(8, argv1(7, 8, 9));
assertEquals(8, argv1(7, 8, 9));
assertEquals(8, argv2(7, 8, 9));
assertEquals(8, argv2(7, 8, 9));

index = 2;
assertEquals(9, argv0(7, 8, 9));
assertEquals(9, argv1(7, 8, 9));
assertEquals(9, argv2(7, 8, 9));


// Test that calling a lazily compiled function with
// an unexpected number of arguments works.
function f(a) { return arguments.length; };
assertEquals(3, f(1, 2, 3));

function f1(x, y) {
  function g(a) {
    a[0] = "three";
    return a.length;
  }
  var l = g(arguments);
  y = 5;
  assertEquals(2, l);
  assertEquals("three", x);
  assertEquals(5, y);
}
f1(3, "five");


function f2() {
  if (arguments[0] > 0) {
    return arguments.callee(arguments[0] - 1) + arguments[0];
  }
  return 0;
}
assertEquals(55, f2(10));


function f3() {
  assertEquals(0, arguments.length);
}
f3();


function f4() {
  var arguments = 0;
  assertEquals(void 0, arguments.length);
}
f4();


function f5(x, y, z) {
  function g(a) {
    x = "two";
    y = "three";
    a[1] = "drei";
    a[2] = "fuenf";
  };

  g(arguments);
  assertEquals("two", x);
  assertEquals("drei", y);
  assertEquals("fuenf", z);
}
f5(2, 3, 5);


function f6(x, y) {
  x = "x";
  arguments[1] = "y";
  return [arguments.length, arguments[0], y, arguments[2]];
}

assertArrayEquals([0, void 0, void 0, void 0], f6());
assertArrayEquals([1, "x", void 0, void 0], f6(1));
assertArrayEquals([2, "x", "y", void 0], f6(9, 17));
assertArrayEquals([3, "x", "y", 7], f6(3, 5, 7));
assertArrayEquals([4, "x", "y", "c"], f6("a", "b", "c", "d"));


function list_args(a) {
  assertEquals("function", typeof a.callee);
  var result = [];
  result.push(a.length);
  for (i = 0; i < a.length; i++) result.push(a[i]);
  return result;
}


function f1(x, y) {
  function g(p) {
    x = p;
  }
  g(y);
  return list_args(arguments);
}

assertArrayEquals([0], f1());
assertArrayEquals([1, void 0], f1(3));
assertArrayEquals([2, 5, 5], f1(3, 5));
assertArrayEquals([3, 5, 5, 7], f1(3, 5, 7));

// Check out of bounds behavior.
function arg_get(x) { return arguments[x]; }
function arg_del(x) { return delete arguments[x]; }
function arg_set(x) { return (arguments[x] = 117); }
assertEquals(undefined, arg_get(0xFFFFFFFF));
assertEquals(true, arg_del(0xFFFFFFFF));
assertEquals(117, arg_set(0xFFFFFFFF));