jdk8-mips64-public/nashorn: test/script/basic/es6/JDK-8168373.js@ee3a76a1dbf2 (annotated)

test/script/basic/es6/JDK-8168373.js@ee3a76a1dbf2 (annotated)

test/script/basic/es6/JDK-8168373.js

Fri, 11 Nov 2016 15:50:51 +0100

author: attila
date: Fri, 11 Nov 2016 15:50:51 +0100
changeset 1980: ee3a76a1dbf2
permissions: -rw-r--r--

8168373: don't emit conversions for symbols outside their lexical scope
Reviewed-by: hannesw, sundar

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