1 /*
2 * Copyright (c) 2000, 2020, 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 import sun.jvm.hotspot.utilities.Observable;
45 import sun.jvm.hotspot.utilities.Observer;
46
47 class ThreadsList extends VMObject {
48 private static AddressField threadsField;
49 private static CIntegerField lengthField;
50
51 static {
52 VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
53 }
54
55 private static synchronized void initialize(TypeDataBase db) {
56 Type type = db.lookupType("ThreadsList");
57 lengthField = type.getCIntegerField("_length");
58 threadsField = type.getAddressField("_threads");
59 }
60
61 public Address getJavaThreadAddressAt(int i) {
62 Address threadAddr = threadsField.getValue(addr);
63 Address at = threadAddr.getAddressAt(VM.getVM().getAddressSize() * i);
64 return at;
65 }
66
67 public long length() {
68 return lengthField.getValue(addr);
69 }
70
71 public ThreadsList(Address addr) {
72 super(addr);
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").getDeclaredConstructor().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 virtualConstructor.addMapping("NotificationThread", NotificationThread.class);
164 }
165
166 public Threads() {
167 _list = VMObjectFactory.newObject(ThreadsList.class, threadListField.getValue());
168 }
169
170 /** NOTE: this returns objects of type JavaThread, CompilerThread,
171 JvmtiAgentThread, NotificationThread, and ServiceThread.
172 The latter four are subclasses of the former. Most operations
173 (fetching the top frame, etc.) are only allowed to be performed on
174 a "pure" JavaThread. For this reason, {@link
175 sun.jvm.hotspot.runtime.JavaThread#isJavaThread} has been
176 changed from the definition in the VM (which returns true for
177 all of these thread types) to return true for JavaThreads and
178 false for the four subclasses. FIXME: should reconsider the
179 inheritance hierarchy; see {@link
180 sun.jvm.hotspot.runtime.JavaThread#isJavaThread}. */
181 public JavaThread getJavaThreadAt(int i) {
182 if (i < _list.length()) {
183 return createJavaThreadWrapper(_list.getJavaThreadAddressAt(i));
184 }
185 return null;
186 }
187
188 public int getNumberOfThreads() {
189 return (int) _list.length();
190 }
191
192 /** Routine for instantiating appropriately-typed wrapper for a
193 JavaThread. Currently needs to be public for OopUtilities to
194 access it. */
195 public JavaThread createJavaThreadWrapper(Address threadAddr) {
196 try {
197 JavaThread thread = (JavaThread)virtualConstructor.instantiateWrapperFor(threadAddr);
198 thread.setThreadPDAccess(access);
199 return thread;
200 } catch (Exception e) {
201 throw new RuntimeException("Unable to deduce type of thread from address " + threadAddr +
202 " (expected type JavaThread, CompilerThread, ServiceThread, JvmtiAgentThread or CodeCacheSweeperThread)", e);
203 }
204 }
205
206 /** Memory operations */
207 public void oopsDo(AddressVisitor oopVisitor) {
208 // FIXME: add more of VM functionality
209 Threads threads = VM.getVM().getThreads();
210 for (int i = 0; i < threads.getNumberOfThreads(); i++) {
211 JavaThread thread = threads.getJavaThreadAt(i);
212 thread.oopsDo(oopVisitor);
213 }
214 }
215
216 // refer to Threads::owning_thread_from_monitor_owner
217 public JavaThread owningThreadFromMonitor(Address o) {
218 if (o == null) return null;
219 for (int i = 0; i < getNumberOfThreads(); i++) {
220 JavaThread thread = getJavaThreadAt(i);
221 if (o.equals(thread.threadObjectAddress())) {
222 return thread;
223 }
224 }
225
226 for (int i = 0; i < getNumberOfThreads(); i++) {
227 JavaThread thread = getJavaThreadAt(i);
228 if (thread.isLockOwned(o))
229 return thread;
230 }
231 return null;
232 }
233
234 public JavaThread owningThreadFromMonitor(ObjectMonitor monitor) {
235 return owningThreadFromMonitor(monitor.owner());
236 }
237
238 // refer to Threads::get_pending_threads
239 // Get list of Java threads that are waiting to enter the specified monitor.
240 public List<JavaThread> getPendingThreads(ObjectMonitor monitor) {
241 List<JavaThread> pendingThreads = new ArrayList<>();
242 for (int i = 0; i < getNumberOfThreads(); i++) {
243 JavaThread thread = getJavaThreadAt(i);
244 if (thread.isCompilerThread() || thread.isCodeCacheSweeperThread()) {
245 continue;
246 }
247 ObjectMonitor pending = thread.getCurrentPendingMonitor();
248 if (monitor.equals(pending)) {
249 pendingThreads.add(thread);
250 }
251 }
252 return pendingThreads;
253 }
254
255 // Get list of Java threads that have called Object.wait on the specified monitor.
256 public List<JavaThread> getWaitingThreads(ObjectMonitor monitor) {
257 List<JavaThread> pendingThreads = new ArrayList<>();
258 for (int i = 0; i < getNumberOfThreads(); i++) {
259 JavaThread thread = getJavaThreadAt(i);
260 ObjectMonitor waiting = thread.getCurrentWaitingMonitor();
261 if (monitor.equals(waiting)) {
262 pendingThreads.add(thread);
263 }
264 }
265 return pendingThreads;
266 }
267
268 // FIXME: add other accessors
269 }