1 /*
2 * Copyright (c) 2000, 2019, 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 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("solaris")) {
100 if (cpu.equals("sparc")) {
101 access = new SolarisSPARCJavaThreadPDAccess();
102 } else if (cpu.equals("x86")) {
103 access = new SolarisX86JavaThreadPDAccess();
104 } else if (cpu.equals("amd64")) {
105 access = new SolarisAMD64JavaThreadPDAccess();
106 }
107 } else if (os.equals("win32")) {
108 if (cpu.equals("x86")) {
109 access = new Win32X86JavaThreadPDAccess();
110 } else if (cpu.equals("amd64")) {
111 access = new Win32AMD64JavaThreadPDAccess();
112 }
113 } else if (os.equals("linux")) {
114 if (cpu.equals("x86")) {
115 access = new LinuxX86JavaThreadPDAccess();
116 } else if (cpu.equals("amd64")) {
117 access = new LinuxAMD64JavaThreadPDAccess();
118 } else if (cpu.equals("sparc")) {
119 access = new LinuxSPARCJavaThreadPDAccess();
120 } else if (cpu.equals("ppc64")) {
121 access = new LinuxPPC64JavaThreadPDAccess();
122 } else if (cpu.equals("aarch64")) {
123 access = new LinuxAARCH64JavaThreadPDAccess();
124 } else {
125 try {
126 access = (JavaThreadPDAccess)
127 Class.forName("sun.jvm.hotspot.runtime.linux_" +
128 cpu.toLowerCase() + ".Linux" + cpu.toUpperCase() +
129 "JavaThreadPDAccess").newInstance();
130 } catch (Exception e) {
131 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
132 " not yet supported");
133 }
134 }
135 } else if (os.equals("bsd")) {
136 if (cpu.equals("x86")) {
137 access = new BsdX86JavaThreadPDAccess();
138 } else if (cpu.equals("amd64") || cpu.equals("x86_64")) {
139 access = new BsdAMD64JavaThreadPDAccess();
140 }
141 } else if (os.equals("darwin")) {
142 if (cpu.equals("amd64") || cpu.equals("x86_64")) {
143 access = new BsdAMD64JavaThreadPDAccess();
144 }
145 }
146
147 if (access == null) {
148 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
149 " not yet supported");
150 }
151
152 virtualConstructor = new VirtualConstructor(db);
153 // Add mappings for all known thread types
154 virtualConstructor.addMapping("JavaThread", JavaThread.class);
155 if (!VM.getVM().isCore()) {
156 virtualConstructor.addMapping("CompilerThread", CompilerThread.class);
157 virtualConstructor.addMapping("CodeCacheSweeperThread", CodeCacheSweeperThread.class);
158 }
159 virtualConstructor.addMapping("JvmtiAgentThread", JvmtiAgentThread.class);
160 virtualConstructor.addMapping("ServiceThread", ServiceThread.class);
161 virtualConstructor.addMapping("NotificationThread", NotificationThread.class);
162 }
163
164 public Threads() {
165 _list = VMObjectFactory.newObject(ThreadsList.class, threadListField.getValue());
166 }
167
168 /** NOTE: this returns objects of type JavaThread, CompilerThread,
169 JvmtiAgentThread, NotificationThread, and ServiceThread.
170 The latter four are subclasses of the former. Most operations
171 (fetching the top frame, etc.) are only allowed to be performed on
172 a "pure" JavaThread. For this reason, {@link
173 sun.jvm.hotspot.runtime.JavaThread#isJavaThread} has been
174 changed from the definition in the VM (which returns true for
175 all of these thread types) to return true for JavaThreads and
176 false for the three subclasses. FIXME: should reconsider the
177 inheritance hierarchy; see {@link
178 sun.jvm.hotspot.runtime.JavaThread#isJavaThread}. */
179 public JavaThread getJavaThreadAt(int i) {
180 if (i < _list.length()) {
181 return createJavaThreadWrapper(_list.getJavaThreadAddressAt(i));
182 }
183 return null;
184 }
185
186 public int getNumberOfThreads() {
187 return (int) _list.length();
188 }
189
190 /** Routine for instantiating appropriately-typed wrapper for a
191 JavaThread. Currently needs to be public for OopUtilities to
192 access it. */
193 public JavaThread createJavaThreadWrapper(Address threadAddr) {
194 try {
195 JavaThread thread = (JavaThread)virtualConstructor.instantiateWrapperFor(threadAddr);
196 thread.setThreadPDAccess(access);
197 return thread;
198 } catch (Exception e) {
199 throw new RuntimeException("Unable to deduce type of thread from address " + threadAddr +
200 " (expected type JavaThread, CompilerThread, ServiceThread, JvmtiAgentThread or CodeCacheSweeperThread)", e);
201 }
202 }
203
204 /** Memory operations */
205 public void oopsDo(AddressVisitor oopVisitor) {
206 // FIXME: add more of VM functionality
207 Threads threads = VM.getVM().getThreads();
208 for (int i = 0; i < threads.getNumberOfThreads(); i++) {
209 JavaThread thread = threads.getJavaThreadAt(i);
210 thread.oopsDo(oopVisitor);
211 }
212 }
213
214 // refer to Threads::owning_thread_from_monitor_owner
215 public JavaThread owningThreadFromMonitor(Address o) {
216 if (o == null) return null;
217 for (int i = 0; i < getNumberOfThreads(); i++) {
218 JavaThread thread = getJavaThreadAt(i);
219 if (o.equals(thread.threadObjectAddress())) {
220 return thread;
221 }
222 }
223
224 for (int i = 0; i < getNumberOfThreads(); i++) {
225 JavaThread thread = getJavaThreadAt(i);
226 if (thread.isLockOwned(o))
227 return thread;
228 }
229 return null;
230 }
231
232 public JavaThread owningThreadFromMonitor(ObjectMonitor monitor) {
233 return owningThreadFromMonitor(monitor.owner());
234 }
235
236 // refer to Threads::get_pending_threads
237 // Get list of Java threads that are waiting to enter the specified monitor.
238 public List getPendingThreads(ObjectMonitor monitor) {
239 List pendingThreads = new ArrayList();
240 for (int i = 0; i < getNumberOfThreads(); i++) {
241 JavaThread thread = getJavaThreadAt(i);
242 if (thread.isCompilerThread() || thread.isCodeCacheSweeperThread()) {
243 continue;
244 }
245 ObjectMonitor pending = thread.getCurrentPendingMonitor();
246 if (monitor.equals(pending)) {
247 pendingThreads.add(thread);
248 }
249 }
250 return pendingThreads;
251 }
252
253 // Get list of Java threads that have called Object.wait on the specified monitor.
254 public List getWaitingThreads(ObjectMonitor monitor) {
255 List pendingThreads = new ArrayList();
256 for (int i = 0; i < getNumberOfThreads(); i++) {
257 JavaThread thread = getJavaThreadAt(i);
258 ObjectMonitor waiting = thread.getCurrentWaitingMonitor();
259 if (monitor.equals(waiting)) {
260 pendingThreads.add(thread);
261 }
262 }
263 return pendingThreads;
264 }
265
266 // FIXME: add other accessors
267 }