1 // Copyright 2010 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. 31 assertEquals(undefined, void (delete 0)); 32 // In an effect context, expression is always false. 33 assertEquals(undefined, (function (x) { delete x; })(0)); 34 35 // In a pure test context, expression is always true. 36 assertEquals(1, (delete 0) ? 1 : 2); 37 // In a pure test context, expression is always false. 38 assertEquals(2, (function (x) { return (delete x) ? 1 : 2; })(0)); 39 // In a negated test context, expression is always false. 40 assertEquals(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. 44 assertEquals(3, 1 + ((delete 0) && 2)); 45 // In a hybrid test/value context, expression is always false, value 46 // expected in accumulator. 47 assertEquals(false, (function (x) { return (delete x) && 2; })(0)); 48 // In a hybrid test/value context, expression is always true, value 49 // expected on stack. 50 assertEquals(3, ((delete 0) && 2) + 1); 51 // In a hybrid test/value context, expression is always false, value 52 // expected on stack. 53 assertEquals(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. 57 assertEquals(2, 1 + ((delete 0) || 2)); 58 // In a hybrid value/test context, expression is always false, value 59 // expected in accumulator. 60 assertEquals(2, (function (x) { return (delete x) || 2; })(0)); 61 // In a hybrid value/test context, expression is always true, value 62 // expected on stack. 63 assertEquals(2, ((delete 0) || 2) + 1); 64 // In a hybrid value/test context, expression is always false, value 65 // expected on stack. 66 assertEquals(3, (function (x) { return ((delete x) || 2) + 1; })(0)); 67 68 69 // 'this' at toplevel is different from all other global variables---not 70 // deletable. 71 assertEquals(true, delete this); 72
