--- a/src/jdk/nashorn/api/scripting/ScriptObjectMirror.java	Mon Nov 04 09:29:12 2013 +0530
+++ b/src/jdk/nashorn/api/scripting/ScriptObjectMirror.java	Tue Nov 05 09:13:41 2013 +0530
@@ -601,9 +601,9 @@
      * @param homeGlobal global to which this object belongs. Not used for ConsStrings.
      * @return wrapped/converted object
      */
-    public static Object wrap(final Object obj, final ScriptObject homeGlobal) {
+    public static Object wrap(final Object obj, final Object homeGlobal) {
         if(obj instanceof ScriptObject) {
-            return homeGlobal != null ? new ScriptObjectMirror((ScriptObject)obj, homeGlobal) : obj;
+            return homeGlobal instanceof ScriptObject ? new ScriptObjectMirror((ScriptObject)obj, (ScriptObject)homeGlobal) : obj;
         }
         if(obj instanceof ConsString) {
             return obj.toString();
@@ -618,7 +618,7 @@
      * @param homeGlobal global to which this object belongs
      * @return unwrapped object
      */
-    public static Object unwrap(final Object obj, final ScriptObject homeGlobal) {
+    public static Object unwrap(final Object obj, final Object homeGlobal) {
         if (obj instanceof ScriptObjectMirror) {
             final ScriptObjectMirror mirror = (ScriptObjectMirror)obj;
             return (mirror.global == homeGlobal)? mirror.sobj : obj;
@@ -634,7 +634,7 @@
      * @param homeGlobal global to which this object belongs
      * @return wrapped array
      */
-    public static Object[] wrapArray(final Object[] args, final ScriptObject homeGlobal) {
+    public static Object[] wrapArray(final Object[] args, final Object homeGlobal) {
         if (args == null || args.length == 0) {
             return args;
         }
@@ -655,7 +655,7 @@
      * @param homeGlobal global to which this object belongs
      * @return unwrapped array
      */
-    public static Object[] unwrapArray(final Object[] args, final ScriptObject homeGlobal) {
+    public static Object[] unwrapArray(final Object[] args, final Object homeGlobal) {
         if (args == null || args.length == 0) {
             return args;
         }

--- a/src/jdk/nashorn/api/scripting/ScriptUtils.java	Mon Nov 04 09:29:12 2013 +0530
+++ b/src/jdk/nashorn/api/scripting/ScriptUtils.java	Tue Nov 05 09:13:41 2013 +0530
@@ -25,7 +25,9 @@
 
 package jdk.nashorn.api.scripting;
 
+import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.ScriptFunction;
+import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
 
 /**
@@ -71,4 +73,59 @@
         return func.makeSynchronizedFunction(sync);
     }
 
+    /**
+     * Make a script object mirror on given object if needed.
+     *
+     * @param obj object to be wrapped
+     * @return wrapped object
+     */
+    public static Object wrap(final Object obj) {
+        if (obj instanceof ScriptObject) {
+            return ScriptObjectMirror.wrap(obj, Context.getGlobal());
+        }
+
+        return obj;
+    }
+
+    /**
+     * Unwrap a script object mirror if needed.
+     *
+     * @param obj object to be unwrapped
+     * @return unwrapped object
+     */
+    public static Object unwrap(final Object obj) {
+        if (obj instanceof ScriptObjectMirror) {
+            return ScriptObjectMirror.unwrap(obj, Context.getGlobal());
+        }
+
+        return obj;
+    }
+
+    /**
+     * Wrap an array of object to script object mirrors if needed.
+     *
+     * @param args array to be unwrapped
+     * @return wrapped array
+     */
+    public static Object[] wrapArray(final Object[] args) {
+        if (args == null || args.length == 0) {
+            return args;
+        }
+
+        return ScriptObjectMirror.wrapArray(args, Context.getGlobal());
+    }
+
+    /**
+     * Unwrap an array of script object mirrors if needed.
+     *
+     * @param args array to be unwrapped
+     * @return unwrapped array
+     */
+    public static Object[] unwrapArray(final Object[] args) {
+        if (args == null || args.length == 0) {
+            return args;
+        }
+
+        return ScriptObjectMirror.unwrapArray(args, Context.getGlobal());
+    }
 }

--- a/src/jdk/nashorn/internal/runtime/linker/NashornLinker.java	Mon Nov 04 09:29:12 2013 +0530
+++ b/src/jdk/nashorn/internal/runtime/linker/NashornLinker.java	Tue Nov 05 09:13:41 2013 +0530
@@ -32,6 +32,8 @@
 import java.lang.reflect.Modifier;
 import java.util.Deque;
 import java.util.List;
+import java.util.Map;
+import javax.script.Bindings;
 import jdk.internal.dynalink.CallSiteDescriptor;
 import jdk.internal.dynalink.linker.ConversionComparator;
 import jdk.internal.dynalink.linker.GuardedInvocation;
@@ -40,7 +42,11 @@
 import jdk.internal.dynalink.linker.LinkerServices;
 import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker;
 import jdk.internal.dynalink.support.Guards;
+import jdk.nashorn.api.scripting.JSObject;
+import jdk.nashorn.api.scripting.ScriptObjectMirror;
+import jdk.nashorn.api.scripting.ScriptUtils;
 import jdk.nashorn.internal.objects.NativeArray;
+import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.JSType;
 import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptObject;
@@ -115,9 +121,14 @@
             return new GuardedInvocation(mh, canLinkTypeStatic(sourceType) ? null : IS_NASHORN_OR_UNDEFINED_TYPE);
         }
 
-        GuardedInvocation inv = getArrayConverter(sourceType, targetType);
-        if(inv != null) {
-            return inv;
+        final GuardedInvocation arrayConverter = getArrayConverter(sourceType, targetType);
+        if(arrayConverter != null) {
+            return arrayConverter;
+        }
+
+        final GuardedInvocation mirrorConverter = getMirrorConverter(sourceType, targetType);
+        if(mirrorConverter != null) {
+            return mirrorConverter;
         }
 
         return getSamTypeConverter(sourceType, targetType);
@@ -181,6 +192,18 @@
         return MH.asType(converter, converter.type().changeReturnType(type));
     }
 
+    private static GuardedInvocation getMirrorConverter(Class<?> sourceType, Class<?> targetType) {
+        // Could've also used (targetType.isAssignableFrom(ScriptObjectMirror.class) && targetType != Object.class) but
+        // it's probably better to explicitly spell out the supported target types
+        if (targetType == Map.class || targetType == Bindings.class || targetType == JSObject.class || targetType == ScriptObjectMirror.class) {
+            if(ScriptObject.class.isAssignableFrom(sourceType)) {
+                return new GuardedInvocation(CREATE_MIRROR, null);
+            }
+            return new GuardedInvocation(CREATE_MIRROR, IS_SCRIPT_OBJECT);
+        }
+        return null;
+    }
+
     private static boolean isAutoConvertibleFromFunction(final Class<?> clazz) {
         return isAbstractClass(clazz) && !ScriptObject.class.isAssignableFrom(clazz) &&
                 JavaAdapterFactory.isAutoConvertibleFromFunction(clazz);
@@ -235,17 +258,23 @@
         return clazz == List.class || clazz == Deque.class;
     }
 
+    private static final MethodHandle IS_SCRIPT_OBJECT = Guards.isInstance(ScriptObject.class, MH.type(Boolean.TYPE, Object.class));
     private static final MethodHandle IS_SCRIPT_FUNCTION = Guards.isInstance(ScriptFunction.class, MH.type(Boolean.TYPE, Object.class));
     private static final MethodHandle IS_NATIVE_ARRAY = Guards.isOfClass(NativeArray.class, MH.type(Boolean.TYPE, Object.class));
 
-    private static final MethodHandle IS_NASHORN_OR_UNDEFINED_TYPE = findOwnMH("isNashornTypeOrUndefined",
-            Boolean.TYPE, Object.class);
+    private static final MethodHandle IS_NASHORN_OR_UNDEFINED_TYPE = findOwnMH("isNashornTypeOrUndefined", Boolean.TYPE, Object.class);
+    private static final MethodHandle CREATE_MIRROR = findOwnMH("createMirror", Object.class, Object.class);
 
     @SuppressWarnings("unused")
     private static boolean isNashornTypeOrUndefined(final Object obj) {
         return obj instanceof ScriptObject || obj instanceof Undefined;
     }
 
+    @SuppressWarnings("unused")
+    private static Object createMirror(final Object obj) {
+        return ScriptUtils.wrap(obj);
+    }
+
     private static MethodHandle findOwnMH(final String name, final Class<?> rtype, final Class<?>... types) {
         return MH.findStatic(MethodHandles.lookup(), NashornLinker.class, name, MH.type(rtype, types));
     }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/script/basic/JDK-8027753.js	Tue Nov 05 09:13:41 2013 +0530
@@ -0,0 +1,50 @@
+/*
+ * 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-8027753: Support ScriptObject to JSObject, ScriptObjectMirror, Map, Bindings auto-conversion as well as explicit wrap, unwrap
+ *
+ * @test
+ * @run
+ */
+
+var ScriptUtils = Java.type("jdk.nashorn.api.scripting.ScriptUtils");
+var ScriptObjectMirror = Java.type("jdk.nashorn.api.scripting.ScriptObjectMirror");
+
+var obj = { foo: 34, bar: 'hello' };
+
+var wrapped = ScriptUtils.wrap(obj);
+if (! (wrapped instanceof ScriptObjectMirror)) {
+    fail("ScriptUtils.wrap does not return a ScriptObjectMirror");
+}
+
+print("wrapped.foo = " + wrapped.foo);
+print("wrapped.bar = " + wrapped.bar);
+
+var unwrapped = ScriptUtils.unwrap(wrapped);
+if (! (unwrapped instanceof Object)) {
+    fail("ScriptUtils.unwrap does not return a ScriptObject");
+}
+
+// same object unwrapped?
+print(unwrapped === obj);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/script/basic/JDK-8027753.js.EXPECTED	Tue Nov 05 09:13:41 2013 +0530
@@ -0,0 +1,3 @@
+wrapped.foo = 34
+wrapped.bar = hello
+true

--- a/test/src/jdk/nashorn/api/scripting/ScriptEngineTest.java	Mon Nov 04 09:29:12 2013 +0530
+++ b/test/src/jdk/nashorn/api/scripting/ScriptEngineTest.java	Tue Nov 05 09:13:41 2013 +0530
@@ -523,6 +523,18 @@
         assertEquals(sw.toString(), println("34 true hello"));
     }
 
+    @Test
+    public void scriptObjectAutoConversionTest() throws ScriptException {
+        final ScriptEngineManager m = new ScriptEngineManager();
+        final ScriptEngine e = m.getEngineByName("nashorn");
+        e.eval("obj = { foo: 'hello' }");
+        e.put("Window", e.eval("Packages.jdk.nashorn.api.scripting.Window"));
+        assertEquals(e.eval("Window.funcJSObject(obj)"), "hello");
+        assertEquals(e.eval("Window.funcScriptObjectMirror(obj)"), "hello");
+        assertEquals(e.eval("Window.funcMap(obj)"), "hello");
+        assertEquals(e.eval("Window.funcJSObject(obj)"), "hello");
+    }
+
     private static final String LINE_SEPARATOR = System.getProperty("line.separator");
 
     // Returns String that would be the result of calling PrintWriter.println

--- a/test/src/jdk/nashorn/api/scripting/Window.java	Mon Nov 04 09:29:12 2013 +0530
+++ b/test/src/jdk/nashorn/api/scripting/Window.java	Tue Nov 05 09:13:41 2013 +0530
@@ -25,6 +25,9 @@
 
 package jdk.nashorn.api.scripting;
 
+import java.util.Map;
+import javax.script.Bindings;
+
 public class Window {
 
     private String location = "http://localhost:8080/window";
@@ -63,4 +66,20 @@
         System.out.println("window.setTimeout: " + delay + ", code: " + code);
         return 0;
     }
+
+    public static Object funcJSObject(final JSObject jsobj) {
+        return jsobj.getMember("foo");
+    }
+
+    public static Object funcScriptObjectMirror(final ScriptObjectMirror sobj) {
+        return sobj.get("foo");
+    }
+
+    public static Object funcMap(final Map<?,?> map) {
+        return map.get("foo");
+    }
+
+    public static Object funcBindings(final Bindings bindings) {
+        return bindings.get("foo");
+    }
 }