1 /* 2 * Copyright (c) 2003, 2013, 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_CLASSLOADINGSERVICE_HPP 26 #define SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP 27 28 #include "runtime/handles.hpp" 29 #include "runtime/perfData.hpp" 30 #include "utilities/growableArray.hpp" 31 #include "utilities/macros.hpp" 32 33 class InstanceKlass; 34 35 // VM monitoring and management support for the Class Loading subsystem 36 class ClassLoadingService : public AllStatic { 37 private: 38 // Counters for classes loaded from class files 39 static PerfCounter* _classes_loaded_count; 40 static PerfCounter* _classes_unloaded_count; 41 static PerfCounter* _classbytes_loaded; 42 static PerfCounter* _classbytes_unloaded; 43 44 // Counters for classes loaded from shared archive 45 static PerfCounter* _shared_classes_loaded_count; 46 static PerfCounter* _shared_classes_unloaded_count; 47 static PerfCounter* _shared_classbytes_loaded; 48 static PerfCounter* _shared_classbytes_unloaded; 49 50 static PerfVariable* _class_methods_size; 51 52 static size_t compute_class_size(InstanceKlass* k); 53 54 public: 55 static void init(); 56 57 static bool get_verbose() { return TraceClassLoading; } 58 static bool set_verbose(bool verbose); 59 static void reset_trace_class_unloading() NOT_MANAGEMENT_RETURN; 60 61 static jlong loaded_class_count() { 62 return _classes_loaded_count->get_value() + _shared_classes_loaded_count->get_value(); 63 } 64 static jlong unloaded_class_count() { 65 return _classes_unloaded_count->get_value() + _shared_classes_unloaded_count->get_value(); 66 } 67 static jlong loaded_class_bytes() { 68 if (UsePerfData) { 69 return _classbytes_loaded->get_value() + _shared_classbytes_loaded->get_value(); 70 } else { 71 return -1; 72 } 73 } 74 static jlong unloaded_class_bytes() { 75 if (UsePerfData) { 76 return _classbytes_unloaded->get_value() + _shared_classbytes_unloaded->get_value(); 77 } else { 78 return -1; 79 } 80 } 81 82 static jlong loaded_shared_class_count() { 83 return _shared_classes_loaded_count->get_value(); 84 } 85 static jlong unloaded_shared_class_count() { 86 return _shared_classes_unloaded_count->get_value(); 87 } 88 static jlong loaded_shared_class_bytes() { 89 if (UsePerfData) { 90 return _shared_classbytes_loaded->get_value(); 91 } else { 92 return -1; 93 } 94 } 95 static jlong unloaded_shared_class_bytes() { 96 if (UsePerfData) { 97 return _shared_classbytes_unloaded->get_value(); 98 } else { 99 return -1; 100 } 101 } 102 static jlong class_method_data_size() { 103 return (UsePerfData ? _class_methods_size->get_value() : -1); 104 } 105 106 static void notify_class_loaded(InstanceKlass* k, bool shared_class) 107 NOT_MANAGEMENT_RETURN; 108 // All unloaded classes are non-shared 109 static void notify_class_unloaded(InstanceKlass* k) NOT_MANAGEMENT_RETURN; 110 static void add_class_method_size(int size) { 111 #if INCLUDE_MANAGEMENT 112 if (UsePerfData) { 113 _class_methods_size->inc(size); 114 } 115 #endif // INCLUDE_MANAGEMENT 116 } 117 }; 118 119 // FIXME: make this piece of code to be shared by M&M and JVMTI 120 class LoadedClassesEnumerator : public StackObj { 121 private: 122 static GrowableArray<KlassHandle>* _loaded_classes; 123 // _current_thread is for creating a KlassHandle with a faster version constructor 124 static Thread* _current_thread; 125 126 GrowableArray<KlassHandle>* _klass_handle_array; 127 128 public: 129 LoadedClassesEnumerator(Thread* cur_thread); 130 131 int num_loaded_classes() { return _klass_handle_array->length(); } 132 KlassHandle get_klass(int index) { return _klass_handle_array->at(index); } 133 134 static void add_loaded_class(Klass* k) { 135 // FIXME: For now - don't include array klasses 136 // The spec is unclear at this point to count array klasses or not 137 // and also indirect creation of array of super class and secondaries 138 // 139 // for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) { 140 // KlassHandle h(_current_thread, l); 141 // _loaded_classes->append(h); 142 // } 143 KlassHandle h(_current_thread, k); 144 _loaded_classes->append(h); 145 } 146 }; 147 148 #endif // SHARE_VM_SERVICES_CLASSLOADINGSERVICE_HPP