1// Copyright 2009 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// Test the handling of initialization of deleted const variables. 29// This only makes sense in local scopes since the declaration and 30// initialization of consts in the global scope happen at the same 31// time. 32 33function testIntroduceGlobal() { 34 var source = 35 // Deleting 'x' removes the local const property. 36 "delete x;" + 37 // Initialization turns into assignment to global 'x'. 38 "const x = 3; assertEquals(3, x);" + 39 // No constness of the global 'x'. 40 "x = 4; assertEquals(4, x);"; 41 eval(source); 42} 43 44testIntroduceGlobal(); 45assertEquals(4, x); 46 47function testAssignExistingGlobal() { 48 var source = 49 // Delete 'x' to remove the local const property. 50 "delete x;" + 51 // Initialization turns into assignment to global 'x'. 52 "const x = 5; assertEquals(5, x);" + 53 // No constness of the global 'x'. 54 "x = 6; assertEquals(6, x);"; 55 eval(source); 56} 57 58testAssignExistingGlobal(); 59assertEquals(6, x); 60 61function testAssignmentArgument(x) { 62 function local() { 63 var source = "delete x; const x = 7; assertEquals(7, x)"; 64 eval(source); 65 } 66 local(); 67 assertEquals(7, x); 68} 69 70testAssignmentArgument(); 71assertEquals(6, x); 72 73__defineSetter__('x', function() { throw 42; }); 74function testAssignGlobalThrows() { 75 // Initialization turns into assignment to global 'x' which 76 // throws an exception. 77 var source = "delete x; const x = 8"; 78 eval(source); 79} 80 81assertThrows("testAssignGlobalThrows()"); 82 83function testInitFastCaseExtension() { 84 var source = "const x = 9; assertEquals(9, x); x = 10; assertEquals(9, x)"; 85 eval(source); 86} 87 88testInitFastCaseExtension(); 89 90function testInitSlowCaseExtension() { 91 var source = ""; 92 // Introduce 100 properties on the context extension object to force 93 // it in slow case. 94 for (var i = 0; i < 100; i++) source += ("var a" + i + " = i;"); 95 source += "const x = 10; assertEquals(10, x); x = 11; assertEquals(10, x)"; 96 eval(source); 97} 98 99testInitSlowCaseExtension(); 100 101function testAssignSurroundingContextSlot() { 102 var x = 12; 103 function local() { 104 var source = "delete x; const x = 13; assertEquals(13, x)"; 105 eval(source); 106 } 107 local(); 108 assertEquals(13, x); 109} 110 111testAssignSurroundingContextSlot(); 112