duke@435: /*
coleenp@4037:  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_SERVICES_SERVICEUTIL_HPP
stefank@2314: #define SHARE_VM_SERVICES_SERVICEUTIL_HPP
stefank@2314: 
stefank@2314: #include "classfile/systemDictionary.hpp"
stefank@2314: #include "oops/objArrayOop.hpp"
stefank@2314: 
duke@435: //
duke@435: // Serviceability utility functions.
duke@435: // (Shared by MM and JVMTI).
duke@435: //
duke@435: class ServiceUtil : public AllStatic {
duke@435:  public:
duke@435: 
duke@435:   // Return true if oop represents an object that is "visible"
duke@435:   // to the java world.
duke@435:   static inline bool visible_oop(oop o) {
duke@435:     // the sentinel for deleted handles isn't visible
duke@435:     if (o == JNIHandles::deleted_handle()) {
duke@435:       return false;
duke@435:     }
duke@435: 
duke@435:     // instance
duke@435:     if (o->is_instance()) {
duke@435:       // instance objects are visible
never@1577:       if (o->klass() != SystemDictionary::Class_klass()) {
duke@435:         return true;
duke@435:       }
duke@435:       if (java_lang_Class::is_primitive(o)) {
duke@435:         return true;
duke@435:       }
duke@435:       // java.lang.Classes are visible
coleenp@4037:       Klass* k = java_lang_Class::as_Klass(o);
coleenp@4037:       if (k->is_klass()) {
duke@435:         // if it's a class for an object, an object array, or
duke@435:         // primitive (type) array then it's visible.
hseigel@4278:         if (k->oop_is_instance()) {
duke@435:           return true;
duke@435:         }
hseigel@4278:         if (k->oop_is_objArray()) {
duke@435:           return true;
duke@435:         }
hseigel@4278:         if (k->oop_is_typeArray()) {
duke@435:           return true;
duke@435:         }
duke@435:       }
duke@435:       return false;
duke@435:     }
duke@435:     // object arrays are visible if they aren't system object arrays
duke@435:     if (o->is_objArray()) {
duke@435:         return true;
duke@435:     }
duke@435:     // type arrays are visible
duke@435:     if (o->is_typeArray()) {
duke@435:       return true;
duke@435:     }
coleenp@4037:     // everything else (Method*s, ...) aren't visible
duke@435:     return false;
duke@435:   };   // end of visible_oop()
duke@435: 
duke@435: };
stefank@2314: 
stefank@2314: #endif // SHARE_VM_SERVICES_SERVICEUTIL_HPP