v8/test/mjsunit/arguments-apply.js

// Copyright 2009 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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//     * Redistributions in binary form must reproduce the above
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//       with the distribution.
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//
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function ReturnArguments() {
  return arguments;
}

function ReturnReceiver() {
  return this;
}


function Global() {
  return ReturnArguments.apply(this, arguments);
}

assertEquals(0, Global().length);
assertEquals(1, Global(1).length);
assertEquals(2, Global(2)[0]);
assertEquals(2, Global(3, 4).length);
assertEquals(3, Global(3, 4)[0]);
assertEquals(4, Global(3, 4)[1]);


function Local() {
  var object = { f: ReturnArguments };
  return object.f.apply(this, arguments);
}

assertEquals(0, Local().length);
assertEquals(1, Local(1).length);
assertEquals(2, Local(2)[0]);
assertEquals(2, Local(3, 4).length);
assertEquals(3, Local(3, 4)[0]);
assertEquals(4, Local(3, 4)[1]);


function ShadowArguments() {
  var arguments = [3, 4];
  return ReturnArguments.apply(this, arguments);
}

assertEquals(2, ShadowArguments().length);
assertEquals(3, ShadowArguments()[0]);
assertEquals(4, ShadowArguments()[1]);


function NonObjectReceiver(receiver) {
  return ReturnReceiver.apply(receiver, arguments);
}

assertEquals(Object(42), NonObjectReceiver(42));
assertEquals("object", typeof NonObjectReceiver(42));
assertInstanceof(NonObjectReceiver(42), Number);
assertSame(this, NonObjectReceiver(null));
assertSame(this, NonObjectReceiver(void 0));


function FunctionReceiver() {
  return ReturnReceiver.apply(Object, arguments);
}

assertTrue(Object === FunctionReceiver());


function ShadowApply() {
  function f() { return 42; }
  f.apply = function() { return 87; }
  return f.apply(this, arguments);
}

assertEquals(87, ShadowApply());
assertEquals(87, ShadowApply(1));
assertEquals(87, ShadowApply(1, 2));


function CallNonFunction() {
  var object = { apply: Function.prototype.apply };
  return object.apply(this, arguments);
}

assertThrows(CallNonFunction, TypeError);


// Make sure that the stack after the apply optimization is
// in a valid state.
function SimpleStackCheck() {
  var sentinel = 42;
  var result = ReturnArguments.apply(this, arguments);
  assertTrue(result != null);
  assertEquals(42, sentinel);
}

SimpleStackCheck();


function ShadowArgumentsWithConstant() {
  var arguments = null;
  return ReturnArguments.apply(this, arguments);
}

assertEquals(0, ShadowArgumentsWithConstant().length);
assertEquals(0, ShadowArgumentsWithConstant(1).length);
assertEquals(0, ShadowArgumentsWithConstant(1, 2).length);


// Make sure we can deal with unfolding lots of arguments on the
// stack even in the presence of the apply optimizations.
var array = new Array(2048);
assertEquals(2048, Global.apply(this, array).length);