1 /*
2 * Copyright (c) 2000, 2021, 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.win32_x86.Win32X86JavaThreadPDAccess;
32 import sun.jvm.hotspot.runtime.win32_amd64.Win32AMD64JavaThreadPDAccess;
33 import sun.jvm.hotspot.runtime.win32_aarch64.Win32AARCH64JavaThreadPDAccess;
34 import sun.jvm.hotspot.runtime.linux_x86.LinuxX86JavaThreadPDAccess;
35 import sun.jvm.hotspot.runtime.linux_amd64.LinuxAMD64JavaThreadPDAccess;
36 import sun.jvm.hotspot.runtime.linux_aarch64.LinuxAARCH64JavaThreadPDAccess;
37 import sun.jvm.hotspot.runtime.linux_ppc64.LinuxPPC64JavaThreadPDAccess;
38 import sun.jvm.hotspot.runtime.bsd_x86.BsdX86JavaThreadPDAccess;
39 import sun.jvm.hotspot.runtime.bsd_amd64.BsdAMD64JavaThreadPDAccess;
40 import sun.jvm.hotspot.runtime.bsd_aarch64.BsdAARCH64JavaThreadPDAccess;
41 import sun.jvm.hotspot.utilities.*;
42 import sun.jvm.hotspot.utilities.Observable;
43 import sun.jvm.hotspot.utilities.Observer;
44
45 class ThreadsList extends VMObject {
46 private static AddressField threadsField;
47 private static CIntegerField lengthField;
48
49 static {
50 VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
51 }
52
53 private static synchronized void initialize(TypeDataBase db) {
54 Type type = db.lookupType("ThreadsList");
55 lengthField = type.getCIntegerField("_length");
56 threadsField = type.getAddressField("_threads");
57 }
58
59 public Address getJavaThreadAddressAt(int i) {
60 Address threadAddr = threadsField.getValue(addr);
61 Address at = threadAddr.getAddressAt(VM.getVM().getAddressSize() * i);
62 return at;
63 }
64
65 public long length() {
66 return lengthField.getValue(addr);
67 }
68
69 public ThreadsList(Address addr) {
70 super(addr);
71 }
72 }
73
74 public class Threads {
75 private static JavaThreadFactory threadFactory;
76 private static AddressField threadListField;
77 private static VirtualConstructor virtualConstructor;
78 private static JavaThreadPDAccess access;
79 private static ThreadsList _list;
80
81 static {
82 VM.registerVMInitializedObserver(new Observer() {
83 public void update(Observable o, Object data) {
84 initialize(VM.getVM().getTypeDataBase());
85 }
86 });
87 }
88
89 private static synchronized void initialize(TypeDataBase db) {
90 Type type = db.lookupType("ThreadsSMRSupport");
91 threadListField = type.getAddressField("_java_thread_list");
92
93 // Instantiate appropriate platform-specific JavaThreadFactory
94 String os = VM.getVM().getOS();
95 String cpu = VM.getVM().getCPU();
96
97 access = null;
98 // FIXME: find the platform specific PD class by reflection?
99 if (os.equals("win32")) {
100 if (cpu.equals("x86")) {
101 access = new Win32X86JavaThreadPDAccess();
102 } else if (cpu.equals("amd64")) {
103 access = new Win32AMD64JavaThreadPDAccess();
104 } else if (cpu.equals("aarch64")) {
105 access = new Win32AARCH64JavaThreadPDAccess();
106 }
107 } else if (os.equals("linux")) {
108 if (cpu.equals("x86")) {
109 access = new LinuxX86JavaThreadPDAccess();
110 } else if (cpu.equals("amd64")) {
111 access = new LinuxAMD64JavaThreadPDAccess();
112 } else if (cpu.equals("ppc64")) {
113 access = new LinuxPPC64JavaThreadPDAccess();
114 } else if (cpu.equals("aarch64")) {
115 access = new LinuxAARCH64JavaThreadPDAccess();
116 } else {
117 try {
118 access = (JavaThreadPDAccess)
119 Class.forName("sun.jvm.hotspot.runtime.linux_" +
120 cpu.toLowerCase() + ".Linux" + cpu.toUpperCase() +
121 "JavaThreadPDAccess").getDeclaredConstructor().newInstance();
122 } catch (Exception e) {
123 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
124 " not yet supported");
125 }
126 }
127 } else if (os.equals("bsd")) {
128 if (cpu.equals("x86")) {
129 access = new BsdX86JavaThreadPDAccess();
130 } else if (cpu.equals("amd64") || cpu.equals("x86_64")) {
131 access = new BsdAMD64JavaThreadPDAccess();
132 }
133 } else if (os.equals("darwin")) {
134 if (cpu.equals("amd64") || cpu.equals("x86_64")) {
135 access = new BsdAMD64JavaThreadPDAccess();
136 } else if (cpu.equals("aarch64")) {
137 access = new BsdAARCH64JavaThreadPDAccess();
138 }
139 }
140
141 if (access == null) {
142 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
143 " not yet supported");
144 }
145
146 virtualConstructor = new VirtualConstructor(db);
147 // Add mappings for all known thread types
148 virtualConstructor.addMapping("JavaThread", JavaThread.class);
149 if (!VM.getVM().isCore()) {
150 virtualConstructor.addMapping("CompilerThread", CompilerThread.class);
151 virtualConstructor.addMapping("CodeCacheSweeperThread", CodeCacheSweeperThread.class);
152 }
153 virtualConstructor.addMapping("JvmtiAgentThread", JvmtiAgentThread.class);
154 virtualConstructor.addMapping("ServiceThread", ServiceThread.class);
155 virtualConstructor.addMapping("MonitorDeflationThread", MonitorDeflationThread.class);
156 virtualConstructor.addMapping("NotificationThread", NotificationThread.class);
157 }
158
159 public Threads() {
160 _list = VMObjectFactory.newObject(ThreadsList.class, threadListField.getValue());
161 }
162
163 /** NOTE: this returns objects of type JavaThread, CompilerThread,
164 JvmtiAgentThread, NotificationThread, MonitorDeflationThread and ServiceThread.
165 The latter four are subclasses of the former. Most operations
166 (fetching the top frame, etc.) are only allowed to be performed on
167 a "pure" JavaThread. For this reason, {@link
168 sun.jvm.hotspot.runtime.JavaThread#isJavaThread} has been
169 changed from the definition in the VM (which returns true for
170 all of these thread types) to return true for JavaThreads and
171 false for the four subclasses. FIXME: should reconsider the
172 inheritance hierarchy; see {@link
173 sun.jvm.hotspot.runtime.JavaThread#isJavaThread}. */
174 public JavaThread getJavaThreadAt(int i) {
175 if (i < _list.length()) {
176 return createJavaThreadWrapper(_list.getJavaThreadAddressAt(i));
177 }
178 return null;
179 }
180
181 public int getNumberOfThreads() {
182 return (int) _list.length();
183 }
184
185 /** Routine for instantiating appropriately-typed wrapper for a
186 JavaThread. Currently needs to be public for OopUtilities to
187 access it. */
188 public JavaThread createJavaThreadWrapper(Address threadAddr) {
189 try {
190 JavaThread thread = (JavaThread)virtualConstructor.instantiateWrapperFor(threadAddr);
191 thread.setThreadPDAccess(access);
192 return thread;
193 } catch (Exception e) {
194 throw new RuntimeException("Unable to deduce type of thread from address " + threadAddr +
195 " (expected type JavaThread, CompilerThread, MonitorDeflationThread, ServiceThread, JvmtiAgentThread or CodeCacheSweeperThread)", e);
196 }
197 }
198
199 /** Memory operations */
200 public void oopsDo(AddressVisitor oopVisitor) {
201 // FIXME: add more of VM functionality
202 Threads threads = VM.getVM().getThreads();
203 for (int i = 0; i < threads.getNumberOfThreads(); i++) {
204 JavaThread thread = threads.getJavaThreadAt(i);
205 thread.oopsDo(oopVisitor);
206 }
207 }
208
209 // refer to Threads::owning_thread_from_monitor_owner
210 public JavaThread owningThreadFromMonitor(Address o) {
211 if (o == null) return null;
212 for (int i = 0; i < getNumberOfThreads(); i++) {
213 JavaThread thread = getJavaThreadAt(i);
214 if (o.equals(thread.threadObjectAddress())) {
215 return thread;
216 }
217 }
218
219 for (int i = 0; i < getNumberOfThreads(); i++) {
220 JavaThread thread = getJavaThreadAt(i);
221 if (thread.isLockOwned(o))
222 return thread;
223 }
224 return null;
225 }
226
227 public JavaThread owningThreadFromMonitor(ObjectMonitor monitor) {
228 return owningThreadFromMonitor(monitor.owner());
229 }
230
231 // refer to Threads::get_pending_threads
232 // Get list of Java threads that are waiting to enter the specified monitor.
233 public List<JavaThread> getPendingThreads(ObjectMonitor monitor) {
234 List<JavaThread> pendingThreads = new ArrayList<>();
235 for (int i = 0; i < getNumberOfThreads(); i++) {
236 JavaThread thread = getJavaThreadAt(i);
237 if (thread.isCompilerThread() || thread.isCodeCacheSweeperThread()) {
238 continue;
239 }
240 ObjectMonitor pending = thread.getCurrentPendingMonitor();
241 if (monitor.equals(pending)) {
242 pendingThreads.add(thread);
243 }
244 }
245 return pendingThreads;
246 }
247
248 // Get list of Java threads that have called Object.wait on the specified monitor.
249 public List<JavaThread> getWaitingThreads(ObjectMonitor monitor) {
250 List<JavaThread> pendingThreads = new ArrayList<>();
251 for (int i = 0; i < getNumberOfThreads(); i++) {
252 JavaThread thread = getJavaThreadAt(i);
253 ObjectMonitor waiting = thread.getCurrentWaitingMonitor();
254 if (monitor.equals(waiting)) {
255 pendingThreads.add(thread);
256 }
257 }
258 return pendingThreads;
259 }
260
261 // FIXME: add other accessors
262 }