Wed, 05 Sep 2018 01:21:35 -0700
Added tag jdk8u192-b09 for changeset 456c0d45c43b
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 */
24 /**
25 * JDK-8168373: don't emit conversions for symbols outside their lexical scope
26 *
27 * @test
28 * @run
29 * @option --language=es6
30 */
32 function p() { return false } // "predicate"
33 function r(x) { return x } // "read"
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 })()