Thu, 25 Aug 2016 09:23:45 -0400
8148854: Class names "SomeClass" and "LSomeClass;" treated by JVM as an equivalent
Summary: Added default format checking of class names loaded by the app class loader
Reviewed-by: andrew
1 /*
2 * Copyright (c) 2014, 2017, 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 */
25 #ifndef SHARE_VM_CLASSFILE_CLASSLOADERSTATS_HPP
26 #define SHARE_VM_CLASSFILE_CLASSLOADERSTATS_HPP
29 #include "classfile/classLoaderData.hpp"
30 #include "oops/klass.hpp"
31 #include "oops/oopsHierarchy.hpp"
32 #include "runtime/vm_operations.hpp"
33 #include "services/diagnosticCommand.hpp"
34 #include "utilities/resourceHash.hpp"
37 class ClassLoaderStatsDCmd : public DCmd {
38 public:
39 ClassLoaderStatsDCmd(outputStream* output, bool heap) :
40 DCmd(output, heap) {
41 }
43 static const char* name() {
44 return "VM.classloader_stats";
45 }
47 static const char* description() {
48 return "Print statistics about all ClassLoaders.";
49 }
51 static const char* impact() {
52 return "Low";
53 }
55 virtual void execute(DCmdSource source, TRAPS);
57 static int num_arguments() {
58 return 0;
59 }
61 static const JavaPermission permission() {
62 JavaPermission p = {"java.lang.management.ManagementPermission",
63 "monitor", NULL};
64 return p;
65 }
66 };
69 class ClassLoaderStats : public ResourceObj {
70 public:
71 ClassLoaderData* _cld;
72 oop _class_loader;
73 oop _parent;
75 size_t _chunk_sz;
76 size_t _block_sz;
77 uintx _classes_count;
79 size_t _anon_chunk_sz;
80 size_t _anon_block_sz;
81 uintx _anon_classes_count;
83 ClassLoaderStats() :
84 _cld(0),
85 _class_loader(0),
86 _parent(0),
87 _chunk_sz(0),
88 _block_sz(0),
89 _classes_count(0),
90 _anon_block_sz(0),
91 _anon_chunk_sz(0),
92 _anon_classes_count(0) {
93 }
94 };
97 class ClassLoaderStatsClosure : public CLDClosure {
98 protected:
99 static bool oop_equals(oop const& s1, oop const& s2) {
100 return s1 == s2;
101 }
103 static unsigned oop_hash(oop const& s1) {
104 // Robert Jenkins 1996 & Thomas Wang 1997
105 // http://web.archive.org/web/20071223173210/http://www.concentric.net/~Ttwang/tech/inthash.htm
106 uintptr_t tmp = cast_from_oop<uintptr_t>(s1);
107 unsigned hash = (unsigned)tmp;
108 hash = ~hash + (hash << 15);
109 hash = hash ^ (hash >> 12);
110 hash = hash + (hash << 2);
111 hash = hash ^ (hash >> 4);
112 hash = hash * 2057;
113 hash = hash ^ (hash >> 16);
114 return hash;
115 }
117 typedef ResourceHashtable<oop, ClassLoaderStats*,
118 ClassLoaderStatsClosure::oop_hash, ClassLoaderStatsClosure::oop_equals> StatsTable;
120 outputStream* _out;
121 StatsTable* _stats;
122 uintx _total_loaders;
123 uintx _total_classes;
124 size_t _total_chunk_sz;
125 size_t _total_block_sz;
127 public:
128 ClassLoaderStatsClosure(outputStream* out) :
129 _out(out),
130 _total_loaders(0),
131 _total_block_sz(0),
132 _total_chunk_sz(0),
133 _total_classes(0),
134 _stats(new StatsTable()) {
135 }
137 virtual void do_cld(ClassLoaderData* cld);
138 virtual bool do_entry(oop const& key, ClassLoaderStats* const& cls);
139 void print();
141 private:
142 void addEmptyParents(oop cl);
143 };
146 class ClassLoaderStatsVMOperation : public VM_Operation {
147 outputStream* _out;
149 public:
150 ClassLoaderStatsVMOperation(outputStream* out) :
151 _out(out) {
152 }
154 VMOp_Type type() const {
155 return VMOp_ClassLoaderStatsOperation;
156 }
158 void doit();
159 };
161 #endif // SHARE_VM_CLASSFILE_CLASSLOADERSTATS_HPP