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// Flags: --allow-natives-syntax 29 30// Test the handling of initialization of deleted const variables. 31// This only makes sense in local scopes since the declaration and 32// initialization of consts in the global scope happen at the same 33// time. 34 35function testIntroduceGlobal() { 36 var source = 37 // Deleting 'x' removes the local const property. 38 "delete x;" + 39 // Initialization redefines global 'x'. 40 "const x = 3; assertEquals(3, x);" + 41 // Test constness of the global 'x'. 42 "x = 4; assertEquals(3, x);"; 43 eval(source); 44} 45 46testIntroduceGlobal(); 47assertEquals("undefined", typeof x); 48 49function testAssignExistingGlobal() { 50 var source = 51 // Delete 'x' to remove the local const property. 52 "delete x;" + 53 // Initialization redefines global 'x'. 54 "const x = 5; assertEquals(5, x);" + 55 // Test constness of the global 'x'. 56 "x = 6; assertEquals(5, x);"; 57 eval(source); 58} 59 60testAssignExistingGlobal(); 61assertEquals("undefined", typeof x); 62 63function testAssignmentArgument(x) { 64 function local() { 65 var source = "delete x; const x = 7; assertEquals(7, x)"; 66 eval(source); 67 } 68 local(); 69 assertEquals("undefined", typeof x); 70} 71 72for (var i = 0; i < 5; i++) { 73 testAssignmentArgument(); 74} 75%OptimizeFunctionOnNextCall(testAssignmentArgument); 76testAssignmentArgument(); 77assertEquals("undefined", typeof x); 78 79__defineSetter__('x', function() { throw 42; }); 80var finished = false; 81function testRedefineGlobal() { 82 // Initialization redefines global 'x'. 83 var source = "delete x; const x = 8; finished = true;"; 84 eval(source); 85} 86 87testRedefineGlobal(); 88assertTrue(finished); 89 90function testInitFastCaseExtension() { 91 var source = "const x = 9; assertEquals(9, x); x = 10; assertEquals(9, x)"; 92 eval(source); 93} 94 95testInitFastCaseExtension(); 96 97function testInitSlowCaseExtension() { 98 var source = ""; 99 // Introduce 100 properties on the context extension object to force 100 // it in slow case. 101 for (var i = 0; i < 100; i++) source += ("var a" + i + " = " + i + ";"); 102 source += "const x = 10; assertEquals(10, x); x = 11; assertEquals(10, x)"; 103 eval(source); 104} 105 106testInitSlowCaseExtension(); 107 108function testAssignSurroundingContextSlot() { 109 var x = 12; 110 function local() { 111 var source = "delete x; const x = 13; assertEquals(13, x)"; 112 eval(source); 113 } 114 local(); 115 assertEquals(12, x); 116} 117 118testAssignSurroundingContextSlot(); 119