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1 /*
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2 * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class instanceKlass;
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26
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27 // VM monitoring and management support for the Class Loading subsystem
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28 class ClassLoadingService : public AllStatic {
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29 private:
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30 // Counters for classes loaded from class files
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31 static PerfCounter* _classes_loaded_count;
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32 static PerfCounter* _classes_unloaded_count;
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33 static PerfCounter* _classbytes_loaded;
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34 static PerfCounter* _classbytes_unloaded;
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35
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36 // Counters for classes loaded from shared archive
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37 static PerfCounter* _shared_classes_loaded_count;
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38 static PerfCounter* _shared_classes_unloaded_count;
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39 static PerfCounter* _shared_classbytes_loaded;
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40 static PerfCounter* _shared_classbytes_unloaded;
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41
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42 static PerfVariable* _class_methods_size;
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43
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44 static size_t compute_class_size(instanceKlass* k);
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45
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46 public:
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47 static void init();
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48
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49 static bool get_verbose() { return TraceClassLoading; }
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50 static bool set_verbose(bool verbose);
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51 static void reset_trace_class_unloading();
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52
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53 static jlong loaded_class_count() {
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54 return _classes_loaded_count->get_value() + _shared_classes_loaded_count->get_value();
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55 }
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56 static jlong unloaded_class_count() {
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57 return _classes_unloaded_count->get_value() + _shared_classes_unloaded_count->get_value();
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58 }
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59 static jlong loaded_class_bytes() {
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60 if (UsePerfData) {
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61 return _classbytes_loaded->get_value() + _shared_classbytes_loaded->get_value();
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62 } else {
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63 return -1;
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64 }
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65 }
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66 static jlong unloaded_class_bytes() {
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67 if (UsePerfData) {
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68 return _classbytes_unloaded->get_value() + _shared_classbytes_unloaded->get_value();
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69 } else {
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70 return -1;
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71 }
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72 }
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73
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74 static jlong loaded_shared_class_count() {
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75 return _shared_classes_loaded_count->get_value();
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76 }
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77 static jlong unloaded_shared_class_count() {
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78 return _shared_classes_unloaded_count->get_value();
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79 }
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80 static jlong loaded_shared_class_bytes() {
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81 if (UsePerfData) {
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82 return _shared_classbytes_loaded->get_value();
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83 } else {
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84 return -1;
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85 }
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86 }
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87 static jlong unloaded_shared_class_bytes() {
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88 if (UsePerfData) {
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89 return _shared_classbytes_unloaded->get_value();
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90 } else {
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91 return -1;
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92 }
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93 }
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94 static jlong class_method_data_size() {
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95 return (UsePerfData ? _class_methods_size->get_value() : -1);
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96 }
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97
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98 static void notify_class_loaded(instanceKlass* k, bool shared_class);
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99 // All unloaded classes are non-shared
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100 static void notify_class_unloaded(instanceKlass* k);
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101 static void add_class_method_size(int size) {
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102 if (UsePerfData) {
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103 _class_methods_size->inc(size);
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104 }
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105 }
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106 };
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107
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108 // FIXME: make this piece of code to be shared by M&M and JVMTI
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109 class LoadedClassesEnumerator : public StackObj {
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110 private:
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111 static GrowableArray<KlassHandle>* _loaded_classes;
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112 // _current_thread is for creating a KlassHandle with a faster version constructor
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113 static Thread* _current_thread;
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114
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115 GrowableArray<KlassHandle>* _klass_handle_array;
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116
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117 public:
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118 LoadedClassesEnumerator(Thread* cur_thread);
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119
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120 int num_loaded_classes() { return _klass_handle_array->length(); }
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121 KlassHandle get_klass(int index) { return _klass_handle_array->at(index); }
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122
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123 static void add_loaded_class(klassOop k) {
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124 // FIXME: For now - don't include array klasses
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125 // The spec is unclear at this point to count array klasses or not
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126 // and also indirect creation of array of super class and secondaries
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127 //
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128 // for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
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129 // KlassHandle h(_current_thread, l);
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130 // _loaded_classes->append(h);
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131 // }
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132 KlassHandle h(_current_thread, k);
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133 _loaded_classes->append(h);
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134 }
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135 };
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