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24 
25 #ifndef SHARE_SERVICES_CLASSLOADINGSERVICE_HPP
26 #define SHARE_SERVICES_CLASSLOADINGSERVICE_HPP
27 
28 #include "logging/log.hpp"
29 #include "runtime/handles.hpp"
30 #include "runtime/perfData.hpp"
31 #include "utilities/growableArray.hpp"
32 #include "utilities/macros.hpp"
33 
34 class InstanceKlass;
35 
36 // VM monitoring and management support for the Class Loading subsystem
37 class ClassLoadingService : public AllStatic {
38 private:
39   // Counters for classes loaded from class files
40   static PerfCounter*  _classes_loaded_count;
41   static PerfCounter*  _classes_unloaded_count;
42   static PerfCounter*  _classbytes_loaded;
43   static PerfCounter*  _classbytes_unloaded;
44 
45   // Counters for classes loaded from shared archive
46   static PerfCounter*  _shared_classes_loaded_count;
47   static PerfCounter*  _shared_classes_unloaded_count;
48   static PerfCounter*  _shared_classbytes_loaded;
49   static PerfCounter*  _shared_classbytes_unloaded;
50 
51   static PerfVariable* _class_methods_size;
52 
53   static size_t compute_class_size(InstanceKlass* k);
54 
55 public:
56   static void init();
57 
get_verbose()58   static bool get_verbose() { return log_is_enabled(Info, class, load); }
59   static bool set_verbose(bool verbose);
60   static void reset_trace_class_unloading() NOT_MANAGEMENT_RETURN;
61 
loaded_class_count()62   static jlong loaded_class_count() {
63     return _classes_loaded_count->get_value() + _shared_classes_loaded_count->get_value();
64   }
unloaded_class_count()65   static jlong unloaded_class_count() {
66     return _classes_unloaded_count->get_value() + _shared_classes_unloaded_count->get_value();
67   }
loaded_class_bytes()68   static jlong loaded_class_bytes() {
69     if (UsePerfData) {
70       return _classbytes_loaded->get_value() + _shared_classbytes_loaded->get_value();
71     } else {
72       return -1;
73     }
74   }
unloaded_class_bytes()75   static jlong unloaded_class_bytes() {
76     if (UsePerfData) {
77       return _classbytes_unloaded->get_value() + _shared_classbytes_unloaded->get_value();
78     } else {
79       return -1;
80     }
81   }
82 
loaded_shared_class_count()83   static jlong loaded_shared_class_count() {
84     return _shared_classes_loaded_count->get_value();
85   }
unloaded_shared_class_count()86   static jlong unloaded_shared_class_count() {
87     return _shared_classes_unloaded_count->get_value();
88   }
loaded_shared_class_bytes()89   static jlong loaded_shared_class_bytes() {
90     if (UsePerfData) {
91       return _shared_classbytes_loaded->get_value();
92     } else {
93       return -1;
94     }
95   }
unloaded_shared_class_bytes()96   static jlong unloaded_shared_class_bytes() {
97     if (UsePerfData) {
98       return _shared_classbytes_unloaded->get_value();
99     } else {
100       return -1;
101     }
102   }
class_method_data_size()103   static jlong class_method_data_size() {
104     return (UsePerfData ? _class_methods_size->get_value() : -1);
105   }
106 
107   static void notify_class_loaded(InstanceKlass* k, bool shared_class)
108       NOT_MANAGEMENT_RETURN;
109   // All unloaded classes are non-shared
110   static void notify_class_unloaded(InstanceKlass* k) NOT_MANAGEMENT_RETURN;
add_class_method_size(int size)111   static void add_class_method_size(int size) {
112 #if INCLUDE_MANAGEMENT
113     if (UsePerfData) {
114       _class_methods_size->inc(size);
115     }
116 #endif // INCLUDE_MANAGEMENT
117   }
118 };
119 
120 #endif // SHARE_SERVICES_CLASSLOADINGSERVICE_HPP
121