--- a/nashorn/src/jdk/nashorn/api/scripting/ScriptObjectMirror.java	Tue Jun 04 22:31:48 2013 +0530
+++ b/nashorn/src/jdk/nashorn/api/scripting/ScriptObjectMirror.java	Wed Jun 05 12:08:49 2013 +0530
@@ -342,20 +342,28 @@
         });
     }
 
-    // package-privates below this.
-    ScriptObject getScriptObject() {
-        return sobj;
-    }
+
+    // These are public only so that Context can access these.
 
-    static Object translateUndefined(Object obj) {
-        return (obj == ScriptRuntime.UNDEFINED)? null : obj;
-    }
-
-    static Object wrap(final Object obj, final ScriptObject homeGlobal) {
+    /**
+     * Make a script object mirror on given object if needed.
+     *
+     * @param obj object to be wrapped
+     * @param homeGlobal global to which this object belongs
+     * @return wrapped object
+     */
+    public static Object wrap(final Object obj, final ScriptObject homeGlobal) {
         return (obj instanceof ScriptObject) ? new ScriptObjectMirror((ScriptObject)obj, homeGlobal) : obj;
     }
 
-    static Object unwrap(final Object obj, final ScriptObject homeGlobal) {
+    /**
+     * Unwrap a script object mirror if needed.
+     *
+     * @param obj object to be unwrapped
+     * @param homeGlobal global to which this object belongs
+     * @return unwrapped object
+     */
+    public static Object unwrap(final Object obj, final ScriptObject homeGlobal) {
         if (obj instanceof ScriptObjectMirror) {
             final ScriptObjectMirror mirror = (ScriptObjectMirror)obj;
             return (mirror.global == homeGlobal)? mirror.sobj : obj;
@@ -364,7 +372,14 @@
         return obj;
     }
 
-    static Object[] wrapArray(final Object[] args, final ScriptObject homeGlobal) {
+    /**
+     * Wrap an array of object to script object mirrors if needed.
+     *
+     * @param args array to be unwrapped
+     * @param homeGlobal global to which this object belongs
+     * @return wrapped array
+     */
+    public static Object[] wrapArray(final Object[] args, final ScriptObject homeGlobal) {
         if (args == null || args.length == 0) {
             return args;
         }
@@ -378,7 +393,14 @@
         return newArgs;
     }
 
-    static Object[] unwrapArray(final Object[] args, final ScriptObject homeGlobal) {
+    /**
+     * Unwrap an array of script object mirrors if needed.
+     *
+     * @param args array to be unwrapped
+     * @param homeGlobal global to which this object belongs
+     * @return unwrapped array
+     */
+    public static Object[] unwrapArray(final Object[] args, final ScriptObject homeGlobal) {
         if (args == null || args.length == 0) {
             return args;
         }
@@ -391,4 +413,13 @@
         }
         return newArgs;
     }
+
+    // package-privates below this.
+    ScriptObject getScriptObject() {
+        return sobj;
+    }
+
+    static Object translateUndefined(Object obj) {
+        return (obj == ScriptRuntime.UNDEFINED)? null : obj;
+    }
 }

--- a/nashorn/src/jdk/nashorn/internal/runtime/Context.java	Tue Jun 04 22:31:48 2013 +0530
+++ b/nashorn/src/jdk/nashorn/internal/runtime/Context.java	Wed Jun 05 12:08:49 2013 +0530
@@ -48,6 +48,7 @@
 import java.security.ProtectionDomain;
 import jdk.internal.org.objectweb.asm.ClassReader;
 import jdk.internal.org.objectweb.asm.util.CheckClassAdapter;
+import jdk.nashorn.api.scripting.ScriptObjectMirror;
 import jdk.nashorn.internal.codegen.Compiler;
 import jdk.nashorn.internal.codegen.ObjectClassGenerator;
 import jdk.nashorn.internal.ir.FunctionNode;
@@ -518,7 +519,7 @@
         setGlobalTrusted(newGlobal);
 
         try {
-            return load(newGlobal, from);
+            return ScriptObjectMirror.wrap(load(newGlobal, from), newGlobal);
         } finally {
             setGlobalTrusted(oldGlobal);
         }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8015945.js	Wed Jun 05 12:08:49 2013 +0530
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2010, 2013, 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-8015945: loadWithNewGlobal return value has to be properly wrapped
+ *
+ * @test
+ * @option -scripting
+ * @run
+ */
+
+var global = loadWithNewGlobal({ name: "<code>",
+    script: <<EOF
+
+function squares() {
+    var res = new Array(arguments.length);
+    for (var i in arguments) {
+        res[i] = arguments[i]*arguments[i]
+    }
+    return res;
+}
+
+this;
+
+EOF
+})
+
+print("global an Object? " + (global instanceof Object));
+var res = global.squares(2, 3, 4, 5);
+print("global.squares returns Array? " + (res instanceof Array));
+// still can access array index properties and length
+print("result length " + res.length);
+for (var i in res) {
+    print(i + " = " + res[i]);
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8015945.js.EXPECTED	Wed Jun 05 12:08:49 2013 +0530
@@ -0,0 +1,7 @@
+global an Object? false
+global.squares returns Array? false
+result length 4
+0 = 4
+1 = 9
+2 = 16
+3 = 25