classLoadingService.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 2003, 2005, 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 25class instanceKlass; 26 27// VM monitoring and management support for the Class Loading subsystem 28class ClassLoadingService : public AllStatic { 29private: 30 // Counters for classes loaded from class files 31 static PerfCounter* _classes_loaded_count; 32 static PerfCounter* _classes_unloaded_count; 33 static PerfCounter* _classbytes_loaded; 34 static PerfCounter* _classbytes_unloaded; 35 36 // Counters for classes loaded from shared archive 37 static PerfCounter* _shared_classes_loaded_count; 38 static PerfCounter* _shared_classes_unloaded_count; 39 static PerfCounter* _shared_classbytes_loaded; 40 static PerfCounter* _shared_classbytes_unloaded; 41 42 static PerfVariable* _class_methods_size; 43 44 static size_t compute_class_size(instanceKlass* k); 45 46public: 47 static void init(); 48 49 static bool get_verbose() { return TraceClassLoading; } 50 static bool set_verbose(bool verbose); 51 static void reset_trace_class_unloading(); 52 53 static jlong loaded_class_count() { 54 return _classes_loaded_count->get_value() + _shared_classes_loaded_count->get_value(); 55 } 56 static jlong unloaded_class_count() { 57 return _classes_unloaded_count->get_value() + _shared_classes_unloaded_count->get_value(); 58 } 59 static jlong loaded_class_bytes() { 60 if (UsePerfData) { 61 return _classbytes_loaded->get_value() + _shared_classbytes_loaded->get_value(); 62 } else { 63 return -1; 64 } 65 } 66 static jlong unloaded_class_bytes() { 67 if (UsePerfData) { 68 return _classbytes_unloaded->get_value() + _shared_classbytes_unloaded->get_value(); 69 } else { 70 return -1; 71 } 72 } 73 74 static jlong loaded_shared_class_count() { 75 return _shared_classes_loaded_count->get_value(); 76 } 77 static jlong unloaded_shared_class_count() { 78 return _shared_classes_unloaded_count->get_value(); 79 } 80 static jlong loaded_shared_class_bytes() { 81 if (UsePerfData) { 82 return _shared_classbytes_loaded->get_value(); 83 } else { 84 return -1; 85 } 86 } 87 static jlong unloaded_shared_class_bytes() { 88 if (UsePerfData) { 89 return _shared_classbytes_unloaded->get_value(); 90 } else { 91 return -1; 92 } 93 } 94 static jlong class_method_data_size() { 95 return (UsePerfData ? _class_methods_size->get_value() : -1); 96 } 97 98 static void notify_class_loaded(instanceKlass* k, bool shared_class); 99 // All unloaded classes are non-shared 100 static void notify_class_unloaded(instanceKlass* k); 101 static void add_class_method_size(int size) { 102 if (UsePerfData) { 103 _class_methods_size->inc(size); 104 } 105 } 106}; 107 108// FIXME: make this piece of code to be shared by M&M and JVMTI 109class LoadedClassesEnumerator : public StackObj { 110private: 111 static GrowableArray<KlassHandle>* _loaded_classes; 112 // _current_thread is for creating a KlassHandle with a faster version constructor 113 static Thread* _current_thread; 114 115 GrowableArray<KlassHandle>* _klass_handle_array; 116 117public: 118 LoadedClassesEnumerator(Thread* cur_thread); 119 120 int num_loaded_classes() { return _klass_handle_array->length(); } 121 KlassHandle get_klass(int index) { return _klass_handle_array->at(index); } 122 123 static void add_loaded_class(klassOop k) { 124 // FIXME: For now - don't include array klasses 125 // The spec is unclear at this point to count array klasses or not 126 // and also indirect creation of array of super class and secondaries 127 // 128 // for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { 129 // KlassHandle h(_current_thread, l); 130 // _loaded_classes->append(h); 131 // } 132 KlassHandle h(_current_thread, k); 133 _loaded_classes->append(h); 134 } 135}; 136