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1 /* |
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2 * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 |
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24 /** |
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25 * JDK-8168373: don't emit conversions for symbols outside their lexical scope |
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26 * |
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27 * @test |
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28 * @run |
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29 * @option --language=es6 |
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30 */ |
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31 |
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32 function p() { return false } // "predicate" |
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33 function r(x) { return x } // "read" |
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34 |
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35 (function() { |
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36 try { // Try creates control flow edges from assignments into catch blocks. |
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37 // Lexically scoped, never read int variable (undefined at catch block) but still with a cf edge into catch block. |
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38 // Since it's never read, it's not written either (Nashorn optimizes some dead writes). |
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39 let x = 0; |
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40 if (p()) { throw {}; } // We need `p()` so this block doesn't get optimized away, for possibility of a `throw` |
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41 x = 0.0; // change the type of x to double |
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42 r(x); // read x otherwise it's optimized away |
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43 } catch (e) {} // under the bug, "throw" will try to widen unwritten int x to double for here and cause a verifier error |
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44 })() |