1 // Copyright 2013 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 // Flags: --allow-natives-syntax --expose-gc --noalways-opt 29 30 function isHoley(obj) { 31 if (%HasFastHoleyElements(obj)) return true; 32 return false; 33 } 34 35 function assertHoley(obj, name_opt) { 36 assertEquals(true, isHoley(obj), name_opt); 37 } 38 39 function assertNotHoley(obj, name_opt) { 40 assertEquals(false, isHoley(obj), name_opt); 41 } 42 43 function create_array(arg) { 44 return new Array(arg); 45 } 46 47 obj = create_array(0); 48 assertNotHoley(obj); 49 create_array(0); 50 %OptimizeFunctionOnNextCall(create_array); 51 obj = create_array(10); 52 assertHoley(obj); 53 54 // The code below would assert in debug or crash in release 55 function f(length) { 56 return new Array(length) 57 } 58 59 f(0); 60 f(0); 61 %OptimizeFunctionOnNextCall(f); 62 var a = f(10); 63 64 function g(a) { 65 return a[0]; 66 } 67 68 var b = [0]; 69 g(b); 70 g(b); 71 assertEquals(undefined, g(a)); 72
