--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/services/serviceUtil.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2003 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+//
+// Serviceability utility functions.
+// (Shared by MM and JVMTI).
+//
+class ServiceUtil : public AllStatic {
+ public:
+
+  // Return true if oop represents an object that is "visible"
+  // to the java world.
+  static inline bool visible_oop(oop o) {
+    // the sentinel for deleted handles isn't visible
+    if (o == JNIHandles::deleted_handle()) {
+      return false;
+    }
+
+    // ignore KlassKlass
+    if (o->is_klass()) {
+      return false;
+    }
+
+    // instance
+    if (o->is_instance()) {
+      // instance objects are visible
+      if (o->klass() != SystemDictionary::class_klass()) {
+        return true;
+      }
+      if (java_lang_Class::is_primitive(o)) {
+        return true;
+      }
+      // java.lang.Classes are visible
+      o = java_lang_Class::as_klassOop(o);
+      if (o->is_klass()) {
+        // if it's a class for an object, an object array, or
+        // primitive (type) array then it's visible.
+        klassOop klass = (klassOop)o;
+        if (Klass::cast(klass)->oop_is_instance()) {
+          return true;
+        }
+        if (Klass::cast(klass)->oop_is_objArray()) {
+          return true;
+        }
+        if (Klass::cast(klass)->oop_is_typeArray()) {
+          return true;
+        }
+      }
+      return false;
+    }
+    // object arrays are visible if they aren't system object arrays
+    if (o->is_objArray()) {
+      objArrayOop array = (objArrayOop)o;
+      if (array->klass() != Universe::systemObjArrayKlassObj()) {
+        return true;
+      } else {
+        return false;
+      }
+    }
+    // type arrays are visible
+    if (o->is_typeArray()) {
+      return true;
+    }
+    // everything else (methodOops, ...) aren't visible
+    return false;
+  };   // end of visible_oop()
+
+};