1 // Copyright 2008 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 function dead1(a, b) { 29 var x = a + b; 30 return a; // x is dead 31 } 32 33 function dead2(a, b) { 34 var x = a | 0; 35 var y = b | 0; 36 return a; // x and y are both dead 37 } 38 39 function dead3(a, b) { 40 var z; 41 if(a == 2) z = a; 42 else z = b; 43 return a; // z is dead 44 } 45 46 function dead4(a) { 47 var z = 3; 48 for (i = 0; i < 3; i++) { 49 z++; 50 } 51 return a; // z is dead 52 } 53 54 function dead5(a) { 55 var z = 3; 56 for (i = 0; i < 3; i++) { 57 z++; 58 } 59 var w = z + a; 60 return a; // z is dead 61 } 62 63 assertTrue(dead1(33, 32) == 33); 64 assertTrue(dead2(33, 32) == 33); 65 assertTrue(dead3(33, 32) == 33); 66 assertTrue(dead4(33) == 33); 67 assertTrue(dead5(33) == 33); 68 69 assertTrue(dead1(34, 7) == 34); 70 assertTrue(dead2(34, 7) == 34); 71 assertTrue(dead3(34, 7) == 34); 72 assertTrue(dead4(34) == 34); 73 assertTrue(dead5(34) == 34); 74 75 assertTrue(dead1(3.4, 0.1) == 3.4); 76 assertTrue(dead2(3.4, 0.1) == 3.4); 77 assertTrue(dead3(3.4, 0.1) == 3.4); 78 assertTrue(dead4(3.4) == 3.4); 79 assertTrue(dead5(3.4) == 3.4); 80
