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 // Either way, count it as a hidden class.
79 cls->_hidden_classes_count += csc._num_classes;
80 } else {
81 cls->_classes_count = csc._num_classes;
82 }
83 _total_classes += csc._num_classes;
84
85 ClassLoaderMetaspace* ms = cld->metaspace_or_null();
86 if (ms != NULL) {
87 if(cld->has_class_mirror_holder()) {
88 cls->_hidden_chunk_sz += ms->allocated_chunks_bytes();
89 cls->_hidden_block_sz += ms->allocated_blocks_bytes();
90 } else {
91 cls->_chunk_sz = ms->allocated_chunks_bytes();
92 cls->_block_sz = ms->allocated_blocks_bytes();
93 }
94 _total_chunk_sz += ms->allocated_chunks_bytes();
95 _total_block_sz += ms->allocated_blocks_bytes();
96 }
97 }
98
99
100 // Handles the difference in pointer width on 32 and 64 bit platforms
101 #ifdef _LP64
102 #define SPACE "%8s"
103 #else
104 #define SPACE "%s"
105 #endif
106
107
108 bool ClassLoaderStatsClosure::do_entry(oop const& key, ClassLoaderStats* const& cls) {
109 Klass* class_loader_klass = (cls->_class_loader == NULL ? NULL : cls->_class_loader->klass());
110 Klass* parent_klass = (cls->_parent == NULL ? NULL : cls->_parent->klass());
111
112 _out->print(INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT " " UINTX_FORMAT_W(6) " " SIZE_FORMAT_W(8) " " SIZE_FORMAT_W(8) " ",
113 p2i(class_loader_klass), p2i(parent_klass), p2i(cls->_cld),
114 cls->_classes_count,
115 cls->_chunk_sz, cls->_block_sz);
116 if (class_loader_klass != NULL) {
117 _out->print("%s", class_loader_klass->external_name());
118 } else {
119 _out->print("<boot class loader>");
120 }
121 _out->cr();
122 if (cls->_hidden_classes_count > 0) {
123 _out->print_cr(SPACE SPACE SPACE " " UINTX_FORMAT_W(6) " " SIZE_FORMAT_W(8) " " SIZE_FORMAT_W(8) " + hidden classes",
124 "", "", "",
125 cls->_hidden_classes_count,
126 cls->_hidden_chunk_sz, cls->_hidden_block_sz);
127 }
128 return true;
129 }
130
131
132 void ClassLoaderStatsClosure::print() {
133 _out->print_cr("ClassLoader" SPACE " Parent" SPACE " CLD*" SPACE " Classes ChunkSz BlockSz Type", "", "", "");
134 _stats->iterate(this);
135 _out->print("Total = " UINTX_FORMAT_W(-6), _total_loaders);
136 _out->print(SPACE SPACE SPACE " ", "", "", "");
137 _out->print_cr(UINTX_FORMAT_W(6) " " SIZE_FORMAT_W(8) " " SIZE_FORMAT_W(8) " ",
138 _total_classes,
139 _total_chunk_sz,
140 _total_block_sz);
141 _out->print_cr("ChunkSz: Total size of all allocated metaspace chunks");
142 _out->print_cr("BlockSz: Total size of all allocated metaspace blocks (each chunk has several blocks)");
143 }
144
145
146 void ClassLoaderStatsClosure::addEmptyParents(oop cl) {
147 while (cl != NULL && java_lang_ClassLoader::loader_data_acquire(cl) == NULL) {
148 // This classloader has not loaded any classes
149 ClassLoaderStats** cls_ptr = _stats->get(cl);
150 if (cls_ptr == NULL) {
151 // It does not exist in our table - add it
152 ClassLoaderStats* cls = new ClassLoaderStats();
153 cls->_class_loader = cl;
154 cls->_parent = java_lang_ClassLoader::parent(cl);
155 _stats->put(cl, cls);
156 _total_loaders++;
157 }
158
159 cl = java_lang_ClassLoader::parent(cl);
160 }
161 }
162
163
164 void ClassLoaderStatsVMOperation::doit() {
165 ClassLoaderStatsClosure clsc (_out);
166 ClassLoaderDataGraph::loaded_cld_do(&clsc);
167 clsc.print();
168 }
169
170
171 void ClassLoaderStatsDCmd::execute(DCmdSource source, TRAPS) {
172 ClassLoaderStatsVMOperation op(output());
173 VMThread::execute(&op);
174 }