1 /* 2 * Copyright (c) 2003, 2018, 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 #include "oops/oop.inline.hpp" 31 32 // 33 // Serviceability utility functions. 34 // (Shared by MM and JVMTI). 35 // 36 class ServiceUtil : public AllStatic { 37 public: 38 39 // Return true if oop represents an object that is "visible" 40 // to the java world. 41 static inline bool visible_oop(oop o) { 42 // instance 43 if (o->is_instance()) { 44 // instance objects are visible 45 if (o->klass() != SystemDictionary::Class_klass()) { 46 return true; 47 } 48 if (java_lang_Class::is_primitive(o)) { 49 return true; 50 } 51 // java.lang.Classes are visible 52 Klass* k = java_lang_Class::as_Klass(o); 53 if (k->is_klass()) { 54 // if it's a class for an object, an object array, or 55 // primitive (type) array then it's visible. 56 if (k->is_instance_klass()) { 57 return true; 58 } 59 if (k->is_objArray_klass()) { 60 return true; 61 } 62 if (k->is_typeArray_klass()) { 63 return true; 64 } 65 } 66 fatal("visible_oop: should never reach here #1"); 67 return false; 68 } 69 // object arrays are visible if they aren't system object arrays 70 if (o->is_objArray()) { 71 return true; 72 } 73 // type arrays are visible 74 if (o->is_typeArray()) { 75 return true; 76 } 77 // everything else (Method*s, ...) aren't visible 78 fatal("visible_oop: should never reach here #2"); 79 return false; 80 }; // end of visible_oop() 81 82 }; 83 84 #endif // SHARE_VM_SERVICES_SERVICEUTIL_HPP