1// Copyright 2011 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28// Tests of unary delete in cases where it is always true or always false. 29 30// In an effect context, expression is always true. 31assertEquals(undefined, void (delete 0)); 32// In an effect context, expression is always false. 33assertEquals(undefined, (function (x) { delete x; })(0)); 34 35// In a pure test context, expression is always true. 36assertEquals(1, (delete 0) ? 1 : 2); 37// In a pure test context, expression is always false. 38assertEquals(2, (function (x) { return (delete x) ? 1 : 2; })(0)); 39// In a negated test context, expression is always false. 40assertEquals(1, (function (x) { return !(delete x) ? 1 : 2; })(0)); 41 42// In a hybrid test/value context, expression is always true, value 43// expected in accumulator. 44assertEquals(3, 1 + ((delete 0) && 2)); 45// In a hybrid test/value context, expression is always false, value 46// expected in accumulator. 47assertEquals(false, (function (x) { return (delete x) && 2; })(0)); 48// In a hybrid test/value context, expression is always true, value 49// expected on stack. 50assertEquals(3, ((delete 0) && 2) + 1); 51// In a hybrid test/value context, expression is always false, value 52// expected on stack. 53assertEquals(1, (function (x) { return ((delete x) && 2) + 1; })(0)); 54 55// In a hybrid value/test context, expression is always true, value 56// expected in accumulator. 57assertEquals(2, 1 + ((delete 0) || 2)); 58// In a hybrid value/test context, expression is always false, value 59// expected in accumulator. 60assertEquals(2, (function (x) { return (delete x) || 2; })(0)); 61// In a hybrid value/test context, expression is always true, value 62// expected on stack. 63assertEquals(2, ((delete 0) || 2) + 1); 64// In a hybrid value/test context, expression is always false, value 65// expected on stack. 66assertEquals(3, (function (x) { return ((delete x) || 2) + 1; })(0)); 67 68 69// 'this' is not a Reference so delete returns true (see section 11.4.1, 70// step 2 of ES 5.1). 71assertEquals(true, delete this); 72assertEquals(true, (function () { return delete this; })()); 73