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| 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 |
| 33 function 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 |
| 44 testIntroduceGlobal(); |
| 45 assertEquals(4, x); |
| 46 |
| 47 function 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 |
| 58 testAssignExistingGlobal(); |
| 59 assertEquals(6, x); |
| 60 |
| 61 function 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 |
| 70 testAssignmentArgument(); |
| 71 assertEquals(6, x); |
| 72 |
| 73 __defineSetter__('x', function() { throw 42; }); |
| 74 function 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 |
| 81 assertThrows("testAssignGlobalThrows()"); |
| 82 |
| 83 function testInitFastCaseExtension() { |
| 84 var source = "const x = 9; assertEquals(9, x); x = 10; assertEquals(9, x)"; |
| 85 eval(source); |
| 86 } |
| 87 |
| 88 testInitFastCaseExtension(); |
| 89 |
| 90 function 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 |
| 99 testInitSlowCaseExtension(); |
| 100 |
| 101 function 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 |
| 111 testAssignSurroundingContextSlot(); |
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