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"This tests that a structure clobber in a basic block that does not touch a live variable causes that variable's structure to be correctly clobbered." 26); 27 28var clobberedObject; 29 30function bar() { 31 if (!clobberedObject) 32 return; 33 delete clobberedObject.f; 34 clobberedObject.g = 42; 35} 36 37function foo(p, o_) { 38 var o = o_.f; // Force this block to have a SetLocal. 39 var x = o.f; 40 if (p) 41 bar(); 42 return x + o.f; 43} 44 45var expected = 2; 46 47for (var i = 0; i < 200; ++i) { 48 var object = {f:1}; 49 var predicate = true; 50 if (i >= 150) { 51 clobberedObject = object; 52 expected = 0/0; // "NaN" 53 } 54 shouldBe("foo(predicate, {f:object})", "" + expected); 55} 56