1 /*
2 * Copyright (c) 2000, 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
25 package sun.jvm.hotspot.runtime;
26
27 import java.util.*;
28
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.types.*;
31 import sun.jvm.hotspot.runtime.solaris_sparc.SolarisSPARCJavaThreadPDAccess;
32 import sun.jvm.hotspot.runtime.solaris_x86.SolarisX86JavaThreadPDAccess;
33 import sun.jvm.hotspot.runtime.solaris_amd64.SolarisAMD64JavaThreadPDAccess;
34 import sun.jvm.hotspot.runtime.win32_amd64.Win32AMD64JavaThreadPDAccess;
35 import sun.jvm.hotspot.runtime.win32_x86.Win32X86JavaThreadPDAccess;
36 import sun.jvm.hotspot.runtime.linux_x86.LinuxX86JavaThreadPDAccess;
37 import sun.jvm.hotspot.runtime.linux_amd64.LinuxAMD64JavaThreadPDAccess;
38 import sun.jvm.hotspot.runtime.linux_aarch64.LinuxAARCH64JavaThreadPDAccess;
39 import sun.jvm.hotspot.runtime.linux_ppc64.LinuxPPC64JavaThreadPDAccess;
40 import sun.jvm.hotspot.runtime.linux_sparc.LinuxSPARCJavaThreadPDAccess;
41 import sun.jvm.hotspot.runtime.bsd_x86.BsdX86JavaThreadPDAccess;
42 import sun.jvm.hotspot.runtime.bsd_amd64.BsdAMD64JavaThreadPDAccess;
43 import sun.jvm.hotspot.utilities.*;
44
45 public class Threads {
46 private static JavaThreadFactory threadFactory;
47 private static AddressField threadListField;
48 private static CIntegerField numOfThreadsField;
49 private static VirtualConstructor virtualConstructor;
50 private static JavaThreadPDAccess access;
51
52 static {
53 VM.registerVMInitializedObserver(new Observer() {
54 public void update(Observable o, Object data) {
55 initialize(VM.getVM().getTypeDataBase());
56 }
57 });
58 }
59
60 private static synchronized void initialize(TypeDataBase db) {
61 Type type = db.lookupType("Threads");
62
63 threadListField = type.getAddressField("_thread_list");
64 numOfThreadsField = type.getCIntegerField("_number_of_threads");
65
66 // Instantiate appropriate platform-specific JavaThreadFactory
67 String os = VM.getVM().getOS();
68 String cpu = VM.getVM().getCPU();
69
70 access = null;
71 // FIXME: find the platform specific PD class by reflection?
72 if (os.equals("solaris")) {
73 if (cpu.equals("sparc")) {
74 access = new SolarisSPARCJavaThreadPDAccess();
75 } else if (cpu.equals("x86")) {
76 access = new SolarisX86JavaThreadPDAccess();
77 } else if (cpu.equals("amd64")) {
78 access = new SolarisAMD64JavaThreadPDAccess();
79 }
80 } else if (os.equals("win32")) {
81 if (cpu.equals("x86")) {
82 access = new Win32X86JavaThreadPDAccess();
83 } else if (cpu.equals("amd64")) {
84 access = new Win32AMD64JavaThreadPDAccess();
85 }
86 } else if (os.equals("linux")) {
87 if (cpu.equals("x86")) {
88 access = new LinuxX86JavaThreadPDAccess();
89 } else if (cpu.equals("amd64")) {
90 access = new LinuxAMD64JavaThreadPDAccess();
91 } else if (cpu.equals("sparc")) {
92 access = new LinuxSPARCJavaThreadPDAccess();
93 } else if (cpu.equals("ppc64")) {
94 access = new LinuxPPC64JavaThreadPDAccess();
95 } else if (cpu.equals("aarch64")) {
96 access = new LinuxAARCH64JavaThreadPDAccess();
97 } else {
98 try {
99 access = (JavaThreadPDAccess)
100 Class.forName("sun.jvm.hotspot.runtime.linux_" +
101 cpu.toLowerCase() + ".Linux" + cpu.toUpperCase() +
102 "JavaThreadPDAccess").newInstance();
103 } catch (Exception e) {
104 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
105 " not yet supported");
106 }
107 }
108 } else if (os.equals("bsd")) {
109 if (cpu.equals("x86")) {
110 access = new BsdX86JavaThreadPDAccess();
111 } else if (cpu.equals("amd64") || cpu.equals("x86_64")) {
112 access = new BsdAMD64JavaThreadPDAccess();
113 }
114 } else if (os.equals("darwin")) {
115 if (cpu.equals("amd64") || cpu.equals("x86_64")) {
116 access = new BsdAMD64JavaThreadPDAccess();
117 }
118 }
119
120 if (access == null) {
121 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
122 " not yet supported");
123 }
124
125 virtualConstructor = new VirtualConstructor(db);
126 // Add mappings for all known thread types
127 virtualConstructor.addMapping("JavaThread", JavaThread.class);
128 if (!VM.getVM().isCore()) {
129 virtualConstructor.addMapping("CompilerThread", CompilerThread.class);
130 virtualConstructor.addMapping("CodeCacheSweeperThread", CodeCacheSweeperThread.class);
131 }
132 virtualConstructor.addMapping("JvmtiAgentThread", JvmtiAgentThread.class);
133 virtualConstructor.addMapping("ServiceThread", ServiceThread.class);
134 }
135
136 public Threads() {
137 }
138
139 /** NOTE: this returns objects of type JavaThread, CompilerThread,
140 JvmtiAgentThread, and ServiceThread.
141 The latter four are subclasses of the former. Most operations
142 (fetching the top frame, etc.) are only allowed to be performed on
143 a "pure" JavaThread. For this reason, {@link
144 sun.jvm.hotspot.runtime.JavaThread#isJavaThread} has been
145 changed from the definition in the VM (which returns true for
146 all of these thread types) to return true for JavaThreads and
147 false for the three subclasses. FIXME: should reconsider the
148 inheritance hierarchy; see {@link
149 sun.jvm.hotspot.runtime.JavaThread#isJavaThread}. */
150 public JavaThread first() {
151 Address threadAddr = threadListField.getValue();
152 if (threadAddr == null) {
153 return null;
154 }
155
156 return createJavaThreadWrapper(threadAddr);
157 }
158
159 public int getNumberOfThreads() {
160 return (int) numOfThreadsField.getValue();
161 }
162
163 /** Routine for instantiating appropriately-typed wrapper for a
164 JavaThread. Currently needs to be public for OopUtilities to
165 access it. */
166 public JavaThread createJavaThreadWrapper(Address threadAddr) {
167 try {
168 JavaThread thread = (JavaThread)virtualConstructor.instantiateWrapperFor(threadAddr);
169 thread.setThreadPDAccess(access);
170 return thread;
171 } catch (Exception e) {
172 throw new RuntimeException("Unable to deduce type of thread from address " + threadAddr +
173 " (expected type JavaThread, CompilerThread, ServiceThread, JvmtiAgentThread or CodeCacheSweeperThread)", e);
174 }
175 }
176
177 /** Memory operations */
178 public void oopsDo(AddressVisitor oopVisitor) {
179 // FIXME: add more of VM functionality
180 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
181 thread.oopsDo(oopVisitor);
182 }
183 }
184
185 // refer to Threads::owning_thread_from_monitor_owner
186 public JavaThread owningThreadFromMonitor(Address o) {
187 if (o == null) return null;
188 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
189 if (o.equals(thread.threadObjectAddress())) {
190 return thread;
191 }
192 }
193
194 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
195 if (thread.isLockOwned(o))
196 return thread;
197 }
198 return null;
199 }
200
201 public JavaThread owningThreadFromMonitor(ObjectMonitor monitor) {
202 return owningThreadFromMonitor(monitor.owner());
203 }
204
205 // refer to Threads::get_pending_threads
206 // Get list of Java threads that are waiting to enter the specified monitor.
207 public List getPendingThreads(ObjectMonitor monitor) {
208 List pendingThreads = new ArrayList();
209 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
210 if (thread.isCompilerThread() || thread.isCodeCacheSweeperThread()) {
211 continue;
212 }
213 ObjectMonitor pending = thread.getCurrentPendingMonitor();
214 if (monitor.equals(pending)) {
215 pendingThreads.add(thread);
216 }
217 }
218 return pendingThreads;
219 }
220
221 // Get list of Java threads that have called Object.wait on the specified monitor.
222 public List getWaitingThreads(ObjectMonitor monitor) {
223 List pendingThreads = new ArrayList();
224 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
225 ObjectMonitor waiting = thread.getCurrentWaitingMonitor();
226 if (monitor.equals(waiting)) {
227 pendingThreads.add(thread);
228 }
229 }
230 return pendingThreads;
231 }
232
233 // FIXME: add other accessors
234 }