Initial load

hotspot/src/share/vm/services/classLoadingService.hpp

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+/*
+ * Copyright 2003-2005 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+class instanceKlass;
+
+// VM monitoring and management support for the Class Loading subsystem
+class ClassLoadingService : public AllStatic {
+private:
+  // Counters for classes loaded from class files
+  static PerfCounter*  _classes_loaded_count;
+  static PerfCounter*  _classes_unloaded_count;
+  static PerfCounter*  _classbytes_loaded;
+  static PerfCounter*  _classbytes_unloaded;
+
+  // Counters for classes loaded from shared archive
+  static PerfCounter*  _shared_classes_loaded_count;
+  static PerfCounter*  _shared_classes_unloaded_count;
+  static PerfCounter*  _shared_classbytes_loaded;
+  static PerfCounter*  _shared_classbytes_unloaded;
+
+  static PerfVariable* _class_methods_size;
+
+  static size_t compute_class_size(instanceKlass* k);
+
+public:
+  static void init();
+
+  static bool get_verbose() { return TraceClassLoading; }
+  static bool set_verbose(bool verbose);
+  static void reset_trace_class_unloading();
+
+  static jlong loaded_class_count() {
+    return _classes_loaded_count->get_value() + _shared_classes_loaded_count->get_value();
+  }
+  static jlong unloaded_class_count() {
+    return _classes_unloaded_count->get_value() + _shared_classes_unloaded_count->get_value();
+  }
+  static jlong loaded_class_bytes() {
+    if (UsePerfData) {
+      return _classbytes_loaded->get_value() + _shared_classbytes_loaded->get_value();
+    } else {
+      return -1;
+    }
+  }
+  static jlong unloaded_class_bytes() {
+    if (UsePerfData) {
+      return _classbytes_unloaded->get_value() + _shared_classbytes_unloaded->get_value();
+    } else {
+      return -1;
+    }
+  }
+
+  static jlong loaded_shared_class_count() {
+    return _shared_classes_loaded_count->get_value();
+  }
+  static jlong unloaded_shared_class_count() {
+    return _shared_classes_unloaded_count->get_value();
+  }
+  static jlong loaded_shared_class_bytes() {
+    if (UsePerfData) {
+      return _shared_classbytes_loaded->get_value();
+    } else {
+      return -1;
+    }
+  }
+  static jlong unloaded_shared_class_bytes() {
+    if (UsePerfData) {
+      return _shared_classbytes_unloaded->get_value();
+    } else {
+      return -1;
+    }
+  }
+  static jlong class_method_data_size() {
+    return (UsePerfData ? _class_methods_size->get_value() : -1);
+  }
+
+  static void notify_class_loaded(instanceKlass* k, bool shared_class);
+  // All unloaded classes are non-shared
+  static void notify_class_unloaded(instanceKlass* k);
+  static void add_class_method_size(int size) {
+    if (UsePerfData) {
+      _class_methods_size->inc(size);
+    }
+  }
+};
+
+// FIXME: make this piece of code to be shared by M&M and JVMTI
+class LoadedClassesEnumerator : public StackObj {
+private:
+  static GrowableArray<KlassHandle>* _loaded_classes;
+  // _current_thread is for creating a KlassHandle with a faster version constructor
+  static Thread*                     _current_thread;
+
+  GrowableArray<KlassHandle>* _klass_handle_array;
+
+public:
+  LoadedClassesEnumerator(Thread* cur_thread);
+
+  int num_loaded_classes()         { return _klass_handle_array->length(); }
+  KlassHandle get_klass(int index) { return _klass_handle_array->at(index); }
+
+  static void add_loaded_class(klassOop k) {
+    // FIXME: For now - don't include array klasses
+    // The spec is unclear at this point to count array klasses or not
+    // and also indirect creation of array of super class and secondaries
+    //
+    // for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
+    //  KlassHandle h(_current_thread, l);
+    //  _loaded_classes->append(h);
+    // }
+    KlassHandle h(_current_thread, k);
+    _loaded_classes->append(h);
+  }
+};