/*

 * Copyright (c) 2003, 2010, 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.

 *

 */

#ifndef SHARE_VM_SERVICES_SERVICEUTIL_HPP

#define SHARE_VM_SERVICES_SERVICEUTIL_HPP

#include "classfile/systemDictionary.hpp"

#include "oops/objArrayOop.hpp"

//

// 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()

};

#endif // SHARE_VM_SERVICES_SERVICEUTIL_HPP