1 /*
2 * Copyright (c) 2000, 2022, 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_riscv64.LinuxRISCV64JavaThreadPDAccess;
38 import sun.jvm.hotspot.runtime.linux_ppc64.LinuxPPC64JavaThreadPDAccess;
39 import sun.jvm.hotspot.runtime.bsd_x86.BsdX86JavaThreadPDAccess;
40 import sun.jvm.hotspot.runtime.bsd_amd64.BsdAMD64JavaThreadPDAccess;
41 import sun.jvm.hotspot.runtime.bsd_aarch64.BsdAARCH64JavaThreadPDAccess;
42 import sun.jvm.hotspot.utilities.*;
43 import sun.jvm.hotspot.utilities.Observable;
44 import sun.jvm.hotspot.utilities.Observer;
45
46 class ThreadsList extends VMObject {
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 public class Threads {
76 private static JavaThreadFactory threadFactory;
77 private static AddressField threadListField;
78 private static VirtualConstructor virtualConstructor;
79 private static JavaThreadPDAccess access;
80 private static ThreadsList _list;
81
82 static {
83 VM.registerVMInitializedObserver(new Observer() {
84 public void update(Observable o, Object data) {
85 initialize(VM.getVM().getTypeDataBase());
86 }
87 });
88 }
89
90 private static synchronized void initialize(TypeDataBase db) {
91 Type type = db.lookupType("ThreadsSMRSupport");
92 threadListField = type.getAddressField("_java_thread_list");
93
94 // Instantiate appropriate platform-specific JavaThreadFactory
95 String os = VM.getVM().getOS();
96 String cpu = VM.getVM().getCPU();
97
98 access = null;
99 // FIXME: find the platform specific PD class by reflection?
100 if (os.equals("win32")) {
101 if (cpu.equals("x86")) {
102 access = new Win32X86JavaThreadPDAccess();
103 } else if (cpu.equals("amd64")) {
104 access = new Win32AMD64JavaThreadPDAccess();
105 } else if (cpu.equals("aarch64")) {
106 access = new Win32AARCH64JavaThreadPDAccess();
107 }
108 } else if (os.equals("linux")) {
109 if (cpu.equals("x86")) {
110 access = new LinuxX86JavaThreadPDAccess();
111 } else if (cpu.equals("amd64")) {
112 access = new LinuxAMD64JavaThreadPDAccess();
113 } else if (cpu.equals("ppc64")) {
114 access = new LinuxPPC64JavaThreadPDAccess();
115 } else if (cpu.equals("aarch64")) {
116 access = new LinuxAARCH64JavaThreadPDAccess();
117 } else if (cpu.equals("riscv64")) {
118 access = new LinuxRISCV64JavaThreadPDAccess();
119 } else {
120 try {
121 access = (JavaThreadPDAccess)
122 Class.forName("sun.jvm.hotspot.runtime.linux_" +
123 cpu.toLowerCase() + ".Linux" + cpu.toUpperCase() +
124 "JavaThreadPDAccess").getDeclaredConstructor().newInstance();
125 } catch (Exception e) {
126 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
127 " not yet supported");
128 }
129 }
130 } else if (os.equals("bsd")) {
131 if (cpu.equals("x86")) {
132 access = new BsdX86JavaThreadPDAccess();
133 } else if (cpu.equals("amd64") || cpu.equals("x86_64")) {
134 access = new BsdAMD64JavaThreadPDAccess();
135 }
136 } else if (os.equals("darwin")) {
137 if (cpu.equals("amd64") || cpu.equals("x86_64")) {
138 access = new BsdAMD64JavaThreadPDAccess();
139 } else if (cpu.equals("aarch64")) {
140 access = new BsdAARCH64JavaThreadPDAccess();
141 }
142 }
143
144 if (access == null) {
145 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
146 " not yet supported");
147 }
148
149 virtualConstructor = new VirtualConstructor(db);
150 // Add mappings for all known thread types
151 virtualConstructor.addMapping("JavaThread", JavaThread.class);
152 if (!VM.getVM().isCore()) {
153 virtualConstructor.addMapping("CompilerThread", CompilerThread.class);
154 virtualConstructor.addMapping("CodeCacheSweeperThread", CodeCacheSweeperThread.class);
155 }
156 virtualConstructor.addMapping("JvmtiAgentThread", JvmtiAgentThread.class);
157 virtualConstructor.addMapping("ServiceThread", ServiceThread.class);
158 virtualConstructor.addMapping("MonitorDeflationThread", MonitorDeflationThread.class);
159 virtualConstructor.addMapping("NotificationThread", NotificationThread.class);
160 }
161
162 public Threads() {
163 _list = VMObjectFactory.newObject(ThreadsList.class, threadListField.getValue());
164 }
165
166 /** NOTE: this returns objects of type JavaThread, CompilerThread,
167 JvmtiAgentThread, NotificationThread, MonitorDeflationThread and ServiceThread.
168 The latter four are subclasses of the former. Most operations
169 (fetching the top frame, etc.) are only allowed to be performed on
170 a "pure" JavaThread. For this reason, {@link
171 sun.jvm.hotspot.runtime.JavaThread#isJavaThread} has been
172 changed from the definition in the VM (which returns true for
173 all of these thread types) to return true for JavaThreads and
174 false for the four subclasses. FIXME: should reconsider the
175 inheritance hierarchy; see {@link
176 sun.jvm.hotspot.runtime.JavaThread#isJavaThread}. */
177 public JavaThread getJavaThreadAt(int i) {
178 if (i < _list.length()) {
179 return createJavaThreadWrapper(_list.getJavaThreadAddressAt(i));
180 }
181 return null;
182 }
183
184 public int getNumberOfThreads() {
185 return (int) _list.length();
186 }
187
188 /** Routine for instantiating appropriately-typed wrapper for a
189 JavaThread. Currently needs to be public for OopUtilities to
190 access it. */
191 public JavaThread createJavaThreadWrapper(Address threadAddr) {
192 try {
193 JavaThread thread = (JavaThread)virtualConstructor.instantiateWrapperFor(threadAddr);
194 thread.setThreadPDAccess(access);
195 return thread;
196 } catch (Exception e) {
197 throw new RuntimeException("Unable to deduce type of thread from address " + threadAddr +
198 " (expected type JavaThread, CompilerThread, MonitorDeflationThread, ServiceThread, JvmtiAgentThread or CodeCacheSweeperThread)", e);
199 }
200 }
201
202 /** Memory operations */
203 public void oopsDo(AddressVisitor oopVisitor) {
204 // FIXME: add more of VM functionality
205 Threads threads = VM.getVM().getThreads();
206 for (int i = 0; i < threads.getNumberOfThreads(); i++) {
207 JavaThread thread = threads.getJavaThreadAt(i);
208 thread.oopsDo(oopVisitor);
209 }
210 }
211
212 // refer to Threads::owning_thread_from_monitor_owner
213 public JavaThread owningThreadFromMonitor(Address o) {
214 if (o == null) return null;
215 for (int i = 0; i < getNumberOfThreads(); i++) {
216 JavaThread thread = getJavaThreadAt(i);
217 if (o.equals(thread.threadObjectAddress())) {
218 return thread;
219 }
220 }
221
222 for (int i = 0; i < getNumberOfThreads(); i++) {
223 JavaThread thread = getJavaThreadAt(i);
224 if (thread.isLockOwned(o))
225 return thread;
226 }
227 return null;
228 }
229
230 public JavaThread owningThreadFromMonitor(ObjectMonitor monitor) {
231 return owningThreadFromMonitor(monitor.owner());
232 }
233
234 // refer to Threads::get_pending_threads
235 // Get list of Java threads that are waiting to enter the specified monitor.
236 public List<JavaThread> getPendingThreads(ObjectMonitor monitor) {
237 List<JavaThread> pendingThreads = new ArrayList<>();
238 for (int i = 0; i < getNumberOfThreads(); i++) {
239 JavaThread thread = getJavaThreadAt(i);
240 if (thread.isCompilerThread() || thread.isCodeCacheSweeperThread()) {
241 continue;
242 }
243 ObjectMonitor pending = thread.getCurrentPendingMonitor();
244 if (monitor.equals(pending)) {
245 pendingThreads.add(thread);
246 }
247 }
248 return pendingThreads;
249 }
250
251 // Get list of Java threads that have called Object.wait on the specified monitor.
252 public List<JavaThread> getWaitingThreads(ObjectMonitor monitor) {
253 List<JavaThread> pendingThreads = new ArrayList<>();
254 for (int i = 0; i < getNumberOfThreads(); i++) {
255 JavaThread thread = getJavaThreadAt(i);
256 ObjectMonitor waiting = thread.getCurrentWaitingMonitor();
257 if (monitor.equals(waiting)) {
258 pendingThreads.add(thread);
259 }
260 }
261 return pendingThreads;
262 }
263
264 // FIXME: add other accessors
265 }