nashorn/test/script/basic/es6/JDK-8168373.js
changeset 41981 10375379aeac
child 45033 0a226c99bb5a
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/es6/JDK-8168373.js	Fri Nov 11 15:50:51 2016 +0100
@@ -0,0 +1,44 @@
+/*
+ * 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
+})()