1 /* 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_SERVICES_SERVICEUTIL_HPP 26 #define SHARE_VM_SERVICES_SERVICEUTIL_HPP 27 28 #include "classfile/systemDictionary.hpp" 29 #include "oops/objArrayOop.hpp" 30 31 // 32 // Serviceability utility functions. 33 // (Shared by MM and JVMTI). 34 // 35 class ServiceUtil : public AllStatic { 36 public: 37 38 // Return true if oop represents an object that is "visible" 39 // to the java world. 40 static inline bool visible_oop(oop o) { 41 // the sentinel for deleted handles isn't visible 42 if (o == JNIHandles::deleted_handle()) { 43 return false; 44 } 45 46 // ignore KlassKlass 47 if (o->is_klass()) { 48 return false; 49 } 50 51 // instance 52 if (o->is_instance()) { 53 // instance objects are visible 54 if (o->klass() != SystemDictionary::Class_klass()) { 55 return true; 56 } 57 if (java_lang_Class::is_primitive(o)) { 58 return true; 59 } 60 // java.lang.Classes are visible 61 o = java_lang_Class::as_klassOop(o); 62 if (o->is_klass()) { 63 // if it's a class for an object, an object array, or 64 // primitive (type) array then it's visible. 65 klassOop klass = (klassOop)o; 66 if (Klass::cast(klass)->oop_is_instance()) { 67 return true; 68 } 69 if (Klass::cast(klass)->oop_is_objArray()) { 70 return true; 71 } 72 if (Klass::cast(klass)->oop_is_typeArray()) { 73 return true; 74 } 75 } 76 return false; 77 } 78 // object arrays are visible if they aren't system object arrays 79 if (o->is_objArray()) { 80 objArrayOop array = (objArrayOop)o; 81 if (array->klass() != Universe::systemObjArrayKlassObj()) { 82 return true; 83 } else { 84 return false; 85 } 86 } 87 // type arrays are visible 88 if (o->is_typeArray()) { 89 return true; 90 } 91 // everything else (methodOops, ...) aren't visible 92 return false; 93 }; // end of visible_oop() 94 95 }; 96 97 #endif // SHARE_VM_SERVICES_SERVICEUTIL_HPP