1 /*
2 * Copyright (c) 2014, 2020, 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
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.inline.hpp"
27 #include "classfile/classLoaderDataGraph.hpp"
28 #include "classfile/classLoaderStats.hpp"
29 #include "oops/objArrayKlass.hpp"
30 #include "oops/oop.inline.hpp"
31 #include "utilities/globalDefinitions.hpp"
32
33
34 class ClassStatsClosure : public KlassClosure {
35 public:
36 int _num_classes;
37
38 ClassStatsClosure() :
39 _num_classes(0) {
40 }
41
42 virtual void do_klass(Klass* k) {
43 _num_classes++;
44 }
45 };
46
47
48 void ClassLoaderStatsClosure::do_cld(ClassLoaderData* cld) {
49 oop cl = cld->class_loader();
50 ClassLoaderStats* cls;
51
52 // The hashtable key is the ClassLoader oop since we want to account
53 // for "real" classes and anonymous classes together
54 ClassLoaderStats** cls_ptr = _stats->get(cl);
55 if (cls_ptr == NULL) {
56 cls = new ClassLoaderStats();
57 _stats->put(cl, cls);
58 _total_loaders++;
59 } else {
60 cls = *cls_ptr;
61 }
62
63 if (!cld->has_class_mirror_holder()) {
64 cls->_cld = cld;
65 }
66
67 cls->_class_loader = cl;
68 if (cl != NULL) {
69 cls->_parent = java_lang_ClassLoader::parent(cl);
70 addEmptyParents(cls->_parent);
71 }
72
73 ClassStatsClosure csc;
74 cld->classes_do(&csc);
75 bool is_hidden = false;
76 if(cld->has_class_mirror_holder()) {
77 // if cld has a class holder then it must be either hidden or unsafe anonymous.
78 Klass* k = cld->klasses();
79 // if it's an array class then need to see if bottom class is hidden.
80 if (k->is_array_klass()) {
81 k = ObjArrayKlass::cast(k)->bottom_klass();
82 }
83 is_hidden = k->is_hidden();
84 if (is_hidden) {
85 cls->_hidden_classes_count += csc._num_classes;
86 } else {
87 cls->_anon_classes_count += csc._num_classes;
88 }
89 } else {
90 cls->_classes_count = csc._num_classes;
91 }
92 _total_classes += csc._num_classes;
93
94 ClassLoaderMetaspace* ms = cld->metaspace_or_null();
95 if (ms != NULL) {
96 if(cld->has_class_mirror_holder()) {
97 if (is_hidden) {
98 cls->_hidden_chunk_sz += ms->allocated_chunks_bytes();
99 cls->_hidden_block_sz += ms->allocated_blocks_bytes();
100 } else {
101 cls->_anon_chunk_sz += ms->allocated_chunks_bytes();
102 cls->_anon_block_sz += ms->allocated_blocks_bytes();
103 }
104 } else {
105 cls->_chunk_sz = ms->allocated_chunks_bytes();
106 cls->_block_sz = ms->allocated_blocks_bytes();
107 }
108 _total_chunk_sz += ms->allocated_chunks_bytes();
109 _total_block_sz += ms->allocated_blocks_bytes();
110 }
111 }
112
113
114 // Handles the difference in pointer width on 32 and 64 bit platforms
115 #ifdef _LP64
116 #define SPACE "%8s"
117 #else
118 #define SPACE "%s"
119 #endif
120
121
122 bool ClassLoaderStatsClosure::do_entry(oop const& key, ClassLoaderStats* const& cls) {
123 Klass* class_loader_klass = (cls->_class_loader == NULL ? NULL : cls->_class_loader->klass());
124 Klass* parent_klass = (cls->_parent == NULL ? NULL : cls->_parent->klass());
125
126 _out->print(INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT " " UINTX_FORMAT_W(6) " " SIZE_FORMAT_W(8) " " SIZE_FORMAT_W(8) " ",
127 p2i(class_loader_klass), p2i(parent_klass), p2i(cls->_cld),
128 cls->_classes_count,
129 cls->_chunk_sz, cls->_block_sz);
130 if (class_loader_klass != NULL) {
131 _out->print("%s", class_loader_klass->external_name());
132 } else {
133 _out->print("<boot class loader>");
134 }
135 _out->cr();
136 if (cls->_anon_classes_count > 0) {
137 _out->print_cr(SPACE SPACE SPACE " " UINTX_FORMAT_W(6) " " SIZE_FORMAT_W(8) " " SIZE_FORMAT_W(8) " + unsafe anonymous classes",
138 "", "", "",
139 cls->_anon_classes_count,
140 cls->_anon_chunk_sz, cls->_anon_block_sz);
141 }
142 if (cls->_hidden_classes_count > 0) {
143 _out->print_cr(SPACE SPACE SPACE " " UINTX_FORMAT_W(6) " " SIZE_FORMAT_W(8) " " SIZE_FORMAT_W(8) " + hidden classes",
144 "", "", "",
145 cls->_hidden_classes_count,
146 cls->_hidden_chunk_sz, cls->_hidden_block_sz);
147 }
148 return true;
149 }
150
151
152 void ClassLoaderStatsClosure::print() {
153 _out->print_cr("ClassLoader" SPACE " Parent" SPACE " CLD*" SPACE " Classes ChunkSz BlockSz Type", "", "", "");
154 _stats->iterate(this);
155 _out->print("Total = " UINTX_FORMAT_W(-6), _total_loaders);
156 _out->print(SPACE SPACE SPACE " ", "", "", "");
157 _out->print_cr(UINTX_FORMAT_W(6) " " SIZE_FORMAT_W(8) " " SIZE_FORMAT_W(8) " ",
158 _total_classes,
159 _total_chunk_sz,
160 _total_block_sz);
161 _out->print_cr("ChunkSz: Total size of all allocated metaspace chunks");
162 _out->print_cr("BlockSz: Total size of all allocated metaspace blocks (each chunk has several blocks)");
163 }
164
165
166 void ClassLoaderStatsClosure::addEmptyParents(oop cl) {
167 while (cl != NULL && java_lang_ClassLoader::loader_data_acquire(cl) == NULL) {
168 // This classloader has not loaded any classes
169 ClassLoaderStats** cls_ptr = _stats->get(cl);
170 if (cls_ptr == NULL) {
171 // It does not exist in our table - add it
172 ClassLoaderStats* cls = new ClassLoaderStats();
173 cls->_class_loader = cl;
174 cls->_parent = java_lang_ClassLoader::parent(cl);
175 _stats->put(cl, cls);
176 _total_loaders++;
177 }
178
179 cl = java_lang_ClassLoader::parent(cl);
180 }
181 }
182
183
184 void ClassLoaderStatsVMOperation::doit() {
185 ClassLoaderStatsClosure clsc (_out);
186 ClassLoaderDataGraph::loaded_cld_do(&clsc);
187 clsc.print();
188 }
189
190
191 void ClassLoaderStatsDCmd::execute(DCmdSource source, TRAPS) {
192 ClassLoaderStatsVMOperation op(output());
193 VMThread::execute(&op);
194 }