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