jdk8-mips64-public/nashorn: test/script/basic/es6/JDK-8168373.js@41ac91662b75

     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 })()

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