dfg-int32-to-double-on-set-local-and-sometimes-exit.js revision b8a8cc1952d61a2f3a2568848933943a543b5d3e
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 24description( 25"Tests that an Int32ToDouble placed on a SetLocal does a forward exit, and works right even when the relevant variable is actually predicted numeric." 26); 27 28var counter = 0; 29 30function checkpoint(text) { 31 debug("Checkpoint: " + text); 32 counter++; 33} 34 35function func1() { 36 checkpoint("a"); 37 a = Date.now() + Date.now() + Date.now() + Date.now() + Date.now() + Date.now(); 38 checkpoint("b"); 39 if (counter < 1100) 40 return 0; 41} 42function func2() { 43 checkpoint("c"); 44 return Date.now() + Date.now() + Date.now() + Date.now() + Date.now() + Date.now(); 45} 46 47function func3(s) { 48 checkpoint("1"); 49 s = func1(); // The bug is that this function will be called twice, if our Int32ToDouble hoisting does a backward speculation. 50 checkpoint("2"); 51 s = func2(); 52 checkpoint("3"); 53 return s; 54} 55 56function test() { 57 return func3(1); 58} 59 60 61for (var i=0; i < 200; i++) { 62 test(); 63} 64 65shouldBe("counter", "1200"); 66