1 // Copyright 2013 the V8 project authors. All rights reserved. 2 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions 6 // are met: 7 // 1. Redistributions of source code must retain the above copyright 8 // notice, this list of conditions and the following disclaimer. 9 // 2. Redistributions in binary form must reproduce the above copyright 10 // notice, this list of conditions and the following disclaimer in the 11 // documentation and/or other materials provided with the distribution. 12 // 13 // THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY 14 // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 // DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY 17 // DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 18 // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19 // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 20 // ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 22 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 24 description( 25 "Tests if the CFG simplifier gracefully handles the case where Block #1 and #2 are merged, #1 has a dead GetLocal, and #2 has a live GetLocal on the same local." 26 ); 27 28 var array = []; 29 30 var getDist = function () { 31 // a conditional absolutely MUST be here for the whole thing to break. 32 // the return value is irrelevant 33 34 if (false) return "I'm irrelevant!"; 35 36 return Math.sqrt(5); 37 } 38 39 40 var calcError = function(){ 41 var dist = 0; // initialisation is necessary for the bug to occur 42 43 true && (dist = getDist()); 44 45 array.push(dist); 46 } 47 48 49 for(var a=0; a<1000; a++){ // the loop needs to be outside calcError, otherwise no bug... 50 calcError(); 51 } 52 53 for (var i = 0; i < array.length; ++i) 54 shouldBe("array[i]", "2.23606797749979"); 55
