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 class ThreadsList extends VMObject {
46
47 private static AddressField threadsField;
48 private static CIntegerField lengthField;
49
50 static {
51 VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
52 }
53
54 private static synchronized void initialize(TypeDataBase db) {
55 Type type = db.lookupType("ThreadsList");
56 lengthField = type.getCIntegerField("_length");
57 threadsField = type.getAddressField("_threads");
58 }
59
60 public Address getJavaThreadAddressAt(int i) {
61 Address threadAddr = threadsField.getValue(addr);
62 Address at = threadAddr.getAddressAt(VM.getVM().getAddressSize() * i);
63 return at;
64 }
65
66 public long length() {
67 return lengthField.getValue(addr);
68 }
69
70 public ThreadsList(Address addr) {
71 super(addr);
72 }
73 }
74
75
76 public class Threads {
77 private static JavaThreadFactory threadFactory;
78 private static AddressField threadListField;
79 private static VirtualConstructor virtualConstructor;
80 private static JavaThreadPDAccess access;
81 private static ThreadsList _list;
82
83 static {
84 VM.registerVMInitializedObserver(new Observer() {
85 public void update(Observable o, Object data) {
86 initialize(VM.getVM().getTypeDataBase());
87 }
88 });
89 }
90
91 private static synchronized void initialize(TypeDataBase db) {
92 Type type = db.lookupType("ThreadsSMRSupport");
93 threadListField = type.getAddressField("_java_thread_list");
94
95 // Instantiate appropriate platform-specific JavaThreadFactory
96 String os = VM.getVM().getOS();
97 String cpu = VM.getVM().getCPU();
98
99 access = null;
100 // FIXME: find the platform specific PD class by reflection?
101 if (os.equals("solaris")) {
102 if (cpu.equals("sparc")) {
103 access = new SolarisSPARCJavaThreadPDAccess();
104 } else if (cpu.equals("x86")) {
105 access = new SolarisX86JavaThreadPDAccess();
106 } else if (cpu.equals("amd64")) {
107 access = new SolarisAMD64JavaThreadPDAccess();
108 }
109 } else if (os.equals("win32")) {
110 if (cpu.equals("x86")) {
111 access = new Win32X86JavaThreadPDAccess();
112 } else if (cpu.equals("amd64")) {
113 access = new Win32AMD64JavaThreadPDAccess();
114 }
115 } else if (os.equals("linux")) {
116 if (cpu.equals("x86")) {
117 access = new LinuxX86JavaThreadPDAccess();
118 } else if (cpu.equals("amd64")) {
119 access = new LinuxAMD64JavaThreadPDAccess();
120 } else if (cpu.equals("sparc")) {
121 access = new LinuxSPARCJavaThreadPDAccess();
122 } else if (cpu.equals("ppc64")) {
123 access = new LinuxPPC64JavaThreadPDAccess();
124 } else if (cpu.equals("aarch64")) {
125 access = new LinuxAARCH64JavaThreadPDAccess();
126 } else {
127 try {
128 access = (JavaThreadPDAccess)
129 Class.forName("sun.jvm.hotspot.runtime.linux_" +
130 cpu.toLowerCase() + ".Linux" + cpu.toUpperCase() +
131 "JavaThreadPDAccess").newInstance();
132 } catch (Exception e) {
133 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
134 " not yet supported");
135 }
136 }
137 } else if (os.equals("bsd")) {
138 if (cpu.equals("x86")) {
139 access = new BsdX86JavaThreadPDAccess();
140 } else if (cpu.equals("amd64") || cpu.equals("x86_64")) {
141 access = new BsdAMD64JavaThreadPDAccess();
142 }
143 } else if (os.equals("darwin")) {
144 if (cpu.equals("amd64") || cpu.equals("x86_64")) {
145 access = new BsdAMD64JavaThreadPDAccess();
146 }
147 }
148
149 if (access == null) {
150 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
151 " not yet supported");
152 }
153
154 virtualConstructor = new VirtualConstructor(db);
155 // Add mappings for all known thread types
156 virtualConstructor.addMapping("JavaThread", JavaThread.class);
157 if (!VM.getVM().isCore()) {
158 virtualConstructor.addMapping("CompilerThread", CompilerThread.class);
159 virtualConstructor.addMapping("CodeCacheSweeperThread", CodeCacheSweeperThread.class);
160 }
161 virtualConstructor.addMapping("JvmtiAgentThread", JvmtiAgentThread.class);
162 virtualConstructor.addMapping("ServiceThread", ServiceThread.class);
163 }
164
165 public Threads() {
166 _list = VMObjectFactory.newObject(ThreadsList.class, threadListField.getValue());
167 }
168
169 /** NOTE: this returns objects of type JavaThread, CompilerThread,
170 JvmtiAgentThread, and ServiceThread.
171 The latter four are subclasses of the former. Most operations
172 (fetching the top frame, etc.) are only allowed to be performed on
173 a "pure" JavaThread. For this reason, {@link
174 sun.jvm.hotspot.runtime.JavaThread#isJavaThread} has been
175 changed from the definition in the VM (which returns true for
176 all of these thread types) to return true for JavaThreads and
177 false for the three subclasses. FIXME: should reconsider the
178 inheritance hierarchy; see {@link
179 sun.jvm.hotspot.runtime.JavaThread#isJavaThread}. */
180 public JavaThread getJavaThreadAt(int i) {
181 if (i < _list.length()) {
182 return createJavaThreadWrapper(_list.getJavaThreadAddressAt(i));
183 }
184 return null;
185 }
186
187 public int getNumberOfThreads() {
188 return (int) _list.length();
189 }
190
191 public interface JavaThreadsDo {
192 void doJavaThread(JavaThread thread);
193 }
194
195 public void doJavaThreads(JavaThreadsDo jtDo) {
196 for (int i = 0; i < _list.length(); i++) {
197 jtDo.doJavaThread(getJavaThreadAt(i));
198 }
199 }
200
201 /** Routine for instantiating appropriately-typed wrapper for a
202 JavaThread. Currently needs to be public for OopUtilities to
203 access it. */
204 public JavaThread createJavaThreadWrapper(Address threadAddr) {
205 try {
206 JavaThread thread = (JavaThread)virtualConstructor.instantiateWrapperFor(threadAddr);
207 thread.setThreadPDAccess(access);
208 return thread;
209 } catch (Exception e) {
210 throw new RuntimeException("Unable to deduce type of thread from address " + threadAddr +
211 " (expected type JavaThread, CompilerThread, ServiceThread, JvmtiAgentThread or CodeCacheSweeperThread)", e);
212 }
213 }
214
215 /** Memory operations */
216 public void oopsDo(AddressVisitor oopVisitor) {
217 // FIXME: add more of VM functionality
218 VM.getVM().getThreads().doJavaThreads((thread) -> thread.oopsDo(oopVisitor));
219 }
220
221 // refer to Threads::owning_thread_from_monitor_owner
222 public JavaThread owningThreadFromMonitor(Address o) {
223 if (o == null) return null;
224 for (int i = 0; i < getNumberOfThreads(); i++) {
225 JavaThread thread = getJavaThreadAt(i);
226 if (o.equals(thread.threadObjectAddress())) {
227 return thread;
228 }
229 }
230
231 for (int i = 0; i < getNumberOfThreads(); i++) {
232 JavaThread thread = getJavaThreadAt(i);
233 if (thread.isLockOwned(o))
234 return thread;
235 }
236 return null;
237 }
238
239 public JavaThread owningThreadFromMonitor(ObjectMonitor monitor) {
240 return owningThreadFromMonitor(monitor.owner());
241 }
242
243 // refer to Threads::get_pending_threads
244 // Get list of Java threads that are waiting to enter the specified monitor.
245 public List getPendingThreads(ObjectMonitor monitor) {
246 List pendingThreads = new ArrayList();
247 for (int i = 0; i < getNumberOfThreads(); i++) {
248 JavaThread thread = getJavaThreadAt(i);
249 if (thread.isCompilerThread() || thread.isCodeCacheSweeperThread()) {
250 continue;
251 }
252 ObjectMonitor pending = thread.getCurrentPendingMonitor();
253 if (monitor.equals(pending)) {
254 pendingThreads.add(thread);
255 }
256 }
257 return pendingThreads;
258 }
259
260 // Get list of Java threads that have called Object.wait on the specified monitor.
261 public List getWaitingThreads(ObjectMonitor monitor) {
262 List pendingThreads = new ArrayList();
263 for (int i = 0; i < getNumberOfThreads(); i++) {
264 JavaThread thread = getJavaThreadAt(i);
265 ObjectMonitor waiting = thread.getCurrentWaitingMonitor();
266 if (monitor.equals(waiting)) {
267 pendingThreads.add(thread);
268 }
269 }
270 return pendingThreads;
271 }
272
273 // FIXME: add other accessors
274 }