JezK
Edit File: arguments-apply.js
// Copyright 2009 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 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);