1 /*
2 * Copyright (c) 2016, 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 import sun.jvm.hotspot.memory.SymbolTable;
25 import sun.jvm.hotspot.oops.Symbol;
26 import sun.jvm.hotspot.runtime.VM;
27 import sun.jvm.hotspot.tools.Tool;
28
29 /**
30 * This class is launched in a sub-process by the main test,
31 * SASymbolTableTest.java.
32 *
33 * It uses SA to connect to another JVM process, whose PID is specified in args[].
34 * The purpose of the test is to validate that we can walk the SymbolTable
35 * and CompactHashTable of the other process. Everything should work regardless
36 * of whether the other process runs in CDS mode or not.
37 *
38 * Note: CompactHashTable is used only when CDS is enabled.
39 */
40 public class SASymbolTableTestAgent extends Tool {
41 public SASymbolTableTestAgent() {
42 super();
43 }
44 public static void main(String args[]) {
45 SASymbolTableTestAgent tool = new SASymbolTableTestAgent();
46 tool.execute(args);
47 }
48
49 static String[] commonNames = {
50 "java/lang/Object",
51 "java/lang/String",
52 "java/lang/Class",
53 "java/lang/Cloneable",
54 "java/lang/ClassLoader",
55 "java/io/Serializable",
56 "java/lang/System",
57 "java/lang/Throwable",
58 "java/lang/Error",
59 "java/lang/ThreadDeath",
60 "java/lang/Exception",
61 "java/lang/RuntimeException",
62 "java/lang/SecurityManager",
63 "java/security/ProtectionDomain",
64 "java/security/AccessControlContext",
65 "java/security/SecureClassLoader",
66 "java/lang/ClassNotFoundException",
67 "java/lang/NoClassDefFoundError",
68 "java/lang/LinkageError",
69 "java/lang/ClassCastException",
70 "java/lang/ArrayStoreException",
71 "java/lang/VirtualMachineError",
72 "java/lang/OutOfMemoryError",
73 "java/lang/StackOverflowError",
74 "java/lang/IllegalMonitorStateException",
75 "java/lang/ref/Reference",
76 "java/lang/ref/SoftReference",
77 "java/lang/ref/WeakReference",
78 "java/lang/ref/FinalReference",
79 "java/lang/ref/PhantomReference",
80 "java/lang/ref/Finalizer",
81 "java/lang/Thread",
82 "java/lang/ThreadGroup",
83 "java/util/Properties",
84 "java/lang/reflect/AccessibleObject",
85 "java/lang/reflect/Field",
86 "java/lang/reflect/Method",
87 "java/lang/reflect/Constructor",
88 "java/lang/invoke/MethodHandle",
89 "java/lang/invoke/MemberName",
90 "java/lang/invoke/MethodHandleNatives",
91 "java/lang/invoke/MethodType",
92 "java/lang/BootstrapMethodError",
93 "java/lang/invoke/CallSite",
94 "java/lang/invoke/ConstantCallSite",
95 "java/lang/invoke/MutableCallSite",
96 "java/lang/invoke/VolatileCallSite",
97 "java/lang/StringBuffer",
98 "java/lang/StringBuilder",
99 "java/io/ByteArrayInputStream",
100 "java/io/File",
101 "java/net/URLClassLoader",
102 "java/net/URL",
103 "java/util/jar/Manifest",
104 "java/security/CodeSource",
105 };
106
107 static String[] badNames = {
108 "java/lang/badbadbad",
109 "java/io/badbadbadbad",
110 "this*symbol*must*not*exist"
111 };
112
113 public void run() {
114 System.out.println("SASymbolTableTestAgent: starting");
115 try {
116 VM vm = VM.getVM();
117 SymbolTable table = vm.getSymbolTable();
118
119 // (a) These are names that are likely to exist in the symbol table
120 // of a JVM after start-up. They were taken from vmSymbols.hpp
121 // during the middle of JDK9 development.
122 //
123 // The purpose is not to check that each name must exist (a future
124 // version of JDK may not preload some of the classes).
125 //
126 // The purpose of this loops is to ensure that we check a lot of symbols,
127 // so we will (most likely) hit on both VALUE_ONLY_BUCKET_TYPE and normal bucket type
128 // in CompactHashTable.probe().
129 for (String n : commonNames) {
130 Symbol s = table.probe(n);
131 System.out.format("%-40s = %s\n", n, s);
132 }
133
134 System.out.println("======================================================================");
135
136 // (b) Also test a few strings that are known to not exist in the table. This will
137 // both the compact table (if it exists) and the regular table to be walked.
138 for (String n : badNames) {
139 Symbol s = table.probe(n);
140 System.out.format("%-40s = %s\n", n, s);
141 }
142 } catch (NullPointerException e) {
143 System.out.println("connected too early -- please try again");
144 }
145 }
146 }