1 /*
2 * Copyright (c) 2018, 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 #include "precompiled.hpp"
25 #include "classfile/classLoaderData.inline.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "memory/metaspace/classLoaderMetaspace.hpp"
28 #include "memory/metaspace/printCLDMetaspaceInfoClosure.hpp"
29 #include "memory/metaspace/printMetaspaceInfoKlassClosure.hpp"
30 #include "memory/metaspace/metaspaceCommon.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "runtime/safepoint.hpp"
33 #include "utilities/globalDefinitions.hpp"
34 #include "utilities/ostream.hpp"
35
36
37 namespace metaspace {
38
39 PrintCLDMetaspaceInfoClosure::PrintCLDMetaspaceInfoClosure(outputStream* out, size_t scale, bool do_print,
40 bool do_print_classes, bool break_down_by_chunktype)
41 : _out(out), _scale(scale), _do_print(do_print), _do_print_classes(do_print_classes)
42 , _break_down_by_chunktype(break_down_by_chunktype)
43 , _num_loaders(0), _num_loaders_without_metaspace(0), _num_loaders_unloading(0)
44 , _num_classes(0), _num_classes_shared(0)
45 {
46 memset(_num_loaders_by_spacetype, 0, sizeof(_num_loaders_by_spacetype));
47 memset(_num_classes_by_spacetype, 0, sizeof(_num_classes_by_spacetype));
48 memset(_num_classes_shared_by_spacetype, 0, sizeof(_num_classes_shared_by_spacetype));
49 }
50
51 // A closure just to count classes
52 class CountKlassClosure : public KlassClosure {
53 public:
54
55 uintx _num_classes;
56 uintx _num_classes_shared;
57
58 CountKlassClosure() : _num_classes(0), _num_classes_shared(0) {}
59 void do_klass(Klass* k) {
60 _num_classes ++;
61 if (k->is_shared()) {
62 _num_classes_shared ++;
63 }
64 }
65
66 }; // end: PrintKlassInfoClosure
67
68 void PrintCLDMetaspaceInfoClosure::do_cld(ClassLoaderData* cld) {
69
70 assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
71
72 if (cld->is_unloading()) {
73 _num_loaders_unloading ++;
74 return;
75 }
76
77 ClassLoaderMetaspace* msp = cld->metaspace_or_null();
78 if (msp == NULL) {
79 _num_loaders_without_metaspace ++;
80 return;
81 }
82
83 // Collect statistics for this class loader metaspace
84 ClassLoaderMetaspaceStatistics this_cld_stat;
85 msp->add_to_statistics(&this_cld_stat);
86
87 // And add it to the running totals
88 _stats_total.add(this_cld_stat);
89 _num_loaders ++;
90 _stats_by_spacetype[msp->space_type()].add(this_cld_stat);
91 _num_loaders_by_spacetype[msp->space_type()] ++;
92
93 // Count classes loaded by this CLD.
94 CountKlassClosure ckc;
95 cld->classes_do(&ckc);
96 // accumulate.
97 _num_classes += ckc._num_classes;
98 _num_classes_by_spacetype[msp->space_type()] += ckc._num_classes;
99 _num_classes_shared += ckc._num_classes_shared;
100 _num_classes_shared_by_spacetype[msp->space_type()] += ckc._num_classes_shared;
101
102 // Optionally, print
103 if (_do_print) {
104
105 _out->print(UINTX_FORMAT_W(4) ": ", _num_loaders);
106
107 // Print "CLD for [<loader name>,] instance of <loader class name>"
108 // or "CLD for <anonymous class>, loaded by [<loader name>,] instance of <loader class name>"
109
110 ResourceMark rm;
111 const char* name = NULL;
112 const char* class_name = NULL;
113
114 // Note: this should also work if unloading:
115 Klass* k = cld->class_loader_klass();
116 if (k != NULL) {
117 class_name = k->external_name();
118 Symbol* s = cld->name();
119 if (s != NULL) {
120 name = s->as_C_string();
121 }
122 } else {
123 name = "<bootstrap>";
124 }
125
126 // Print
127 _out->print("CLD " PTR_FORMAT, p2i(cld));
128 if (cld->is_unloading()) {
129 _out->print(" (unloading)");
130 }
131 _out->print(":");
132 if (cld->is_unsafe_anonymous()) {
133 _out->print(" <anonymous class>, loaded by");
134 }
135 if (name != NULL) {
136 _out->print(" \"%s\"", name);
137 }
138 if (class_name != NULL) {
139 _out->print(" instance of %s", class_name);
140 }
141
142 if (_do_print_classes) {
143 // Print a detailed description of all loaded classes.
144 streamIndentor sti(_out, 6);
145 _out->cr_indent();
146 _out->print("Loaded classes");
147 if (ckc._num_classes_shared > 0) {
148 _out->print("('s' = shared)");
149 }
150 _out->print(":");
151 PrintMetaspaceInfoKlassClosure pkic(_out, true);
152 cld->classes_do(&pkic);
153 _out->cr_indent();
154 _out->print("-total-: ");
155 print_number_of_classes(_out, ckc._num_classes, ckc._num_classes_shared);
156 } else {
157 // Just print a summary about how many classes have been loaded.
158 _out->print(", ");
159 print_number_of_classes(_out, ckc._num_classes, ckc._num_classes_shared);
160 }
161
162 // Print statistics
163 this_cld_stat.print_on(_out, _scale, _break_down_by_chunktype);
164 _out->cr();
165
166 }
167
168 }
169
170 } // namespace metaspace
171