1 /*
2 * Copyright (c) 2003, 2017, 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.tools;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.code.*;
30 import sun.jvm.hotspot.interpreter.*;
31 import sun.jvm.hotspot.debugger.*;
32 import sun.jvm.hotspot.debugger.cdbg.*;
33 import sun.jvm.hotspot.oops.*;
34 import sun.jvm.hotspot.runtime.*;
35 import sun.jvm.hotspot.utilities.PlatformInfo;
36
37 public class PStack extends Tool {
38 // in non-verbose mode, Method*s are not printed in java frames
39 public PStack(boolean v, boolean concurrentLocks) {
40 this.verbose = v;
41 this.concurrentLocks = concurrentLocks;
42 }
43
44 public PStack() {
45 this(true, true);
46 }
47
48 public PStack(JVMDebugger d) {
49 super(d);
50 }
51
52 public void run() {
53 run(System.out);
54 }
55
56 public void run(PrintStream out) {
57 Debugger dbg = getAgent().getDebugger();
58 run(out, dbg);
59 }
60
61 public void run(PrintStream out, Debugger dbg) {
62 if (PlatformInfo.getOS().equals("darwin")) {
63 out.println("Not available on Darwin");
64 return;
65 }
66
67 CDebugger cdbg = dbg.getCDebugger();
68 if (cdbg != null) {
69 ConcurrentLocksPrinter concLocksPrinter = null;
70 // compute and cache java Vframes.
71 initJFrameCache();
72 if (concurrentLocks) {
73 concLocksPrinter = new ConcurrentLocksPrinter();
74 }
75 // print Java level deadlocks
76 try {
77 DeadlockDetector.print(out);
78 } catch (Exception exp) {
79 out.println("can't print deadlock information: " + exp.getMessage());
80 }
81
82 List l = cdbg.getThreadList();
83 final boolean cdbgCanDemangle = cdbg.canDemangle();
84 for (Iterator itr = l.iterator() ; itr.hasNext();) {
85 ThreadProxy th = (ThreadProxy) itr.next();
86 try {
87 CFrame f = cdbg.topFrameForThread(th);
88 out.print("----------------- ");
89 out.print(th);
90 out.println(" -----------------");
91 JavaThread jthread = (JavaThread) proxyToThread.get(th);
92 if (jthread != null) {
93 jthread.printThreadInfoOn(out);
94 }
95 while (f != null) {
96 ClosestSymbol sym = f.closestSymbolToPC();
97 Address pc = f.pc();
98 out.print(pc + "\t");
99 if (sym != null) {
100 String name = sym.getName();
101 if (cdbgCanDemangle) {
102 name = cdbg.demangle(name);
103 }
104 out.print(name);
105 long diff = sym.getOffset();
106 if (diff != 0L) {
107 out.print(" + 0x" + Long.toHexString(diff));
108 }
109 out.println();
110 } else {
111 // look for one or more java frames
112 String[] names = null;
113 // check interpreter frame
114 Interpreter interp = VM.getVM().getInterpreter();
115 if (interp.contains(pc)) {
116 names = getJavaNames(th, f.localVariableBase());
117 // print codelet name if we can't determine method
118 if (names == null || names.length == 0) {
119 out.print("<interpreter> ");
120 InterpreterCodelet ic = interp.getCodeletContaining(pc);
121 if (ic != null) {
122 String desc = ic.getDescription();
123 if (desc != null) out.print(desc);
124 }
125 out.println();
126 }
127 } else {
128 // look for known code blobs
129 CodeCache c = VM.getVM().getCodeCache();
130 if (c.contains(pc)) {
131 CodeBlob cb = c.findBlobUnsafe(pc);
132 if (cb.isNMethod()) {
133 names = getJavaNames(th, f.localVariableBase());
134 // just print compiled code, if can't determine method
135 if (names == null || names.length == 0) {
136 out.println("<Unknown compiled code>");
137 }
138 } else if (cb.isBufferBlob()) {
139 out.println("<StubRoutines>");
140 } else if (cb.isRuntimeStub()) {
141 out.println("<RuntimeStub>");
142 } else if (cb.isDeoptimizationStub()) {
143 out.println("<DeoptimizationStub>");
144 } else if (cb.isUncommonTrapStub()) {
145 out.println("<UncommonTrap>");
146 } else if (cb.isExceptionStub()) {
147 out.println("<ExceptionStub>");
148 } else if (cb.isSafepointStub()) {
149 out.println("<SafepointStub>");
150 } else {
151 out.println("<Unknown code blob>");
152 }
153 } else {
154 printUnknown(out);
155 }
156 }
157 // print java frames, if any
158 if (names != null && names.length != 0) {
159 // print java frame(s)
160 for (int i = 0; i < names.length; i++) {
161 out.println(names[i]);
162 }
163 }
164 }
165 f = f.sender(th);
166 }
167 } catch (Exception exp) {
168 exp.printStackTrace();
169 // continue, may be we can do a better job for other threads
170 }
171 if (concurrentLocks) {
172 JavaThread jthread = (JavaThread) proxyToThread.get(th);
173 if (jthread != null) {
174 concLocksPrinter.print(jthread, out);
175 }
176 }
177 } // for threads
178 } else {
179 if (getDebugeeType() == DEBUGEE_REMOTE) {
180 out.println("remote configuration is not yet implemented");
181 } else {
182 out.println("not yet implemented (debugger does not support CDebugger)!");
183 }
184 }
185 }
186
187 public static void main(String[] args) throws Exception {
188 PStack t = new PStack();
189 t.execute(args);
190 }
191
192 // -- Internals only below this point
193 private Map jframeCache; // Map<ThreadProxy, JavaVFrame[]>
194 private Map proxyToThread; // Map<ThreadProxy, JavaThread>
195 private PrintStream out;
196 private boolean verbose;
197 private boolean concurrentLocks;
198
199 private void initJFrameCache() {
200 // cache frames for subsequent reference
201 jframeCache = new HashMap();
202 proxyToThread = new HashMap();
203 VM.getVM().getThreads().doJavaThreads((cur) -> {
204 List tmp = new ArrayList(10);
205 try {
206 for (JavaVFrame vf = cur.getLastJavaVFrameDbg(); vf != null; vf = vf.javaSender()) {
207 tmp.add(vf);
208 }
209 } catch (Exception exp) {
210 // may be we may get frames for other threads, continue
211 // after printing stack trace.
212 exp.printStackTrace();
213 }
214 JavaVFrame[] jvframes = new JavaVFrame[tmp.size()];
215 System.arraycopy(tmp.toArray(), 0, jvframes, 0, jvframes.length);
216 jframeCache.put(cur.getThreadProxy(), jvframes);
217 proxyToThread.put(cur.getThreadProxy(), cur);
218 });
219 }
220
221 private void printUnknown(PrintStream out) {
222 out.println("\t????????");
223 }
224
225 private String[] getJavaNames(ThreadProxy th, Address fp) {
226 if (fp == null) {
227 return null;
228 }
229 JavaVFrame[] jvframes = (JavaVFrame[]) jframeCache.get(th);
230 if (jvframes == null) return null; // not a java thread
231 List names = new ArrayList(10);
232 for (int fCount = 0; fCount < jvframes.length; fCount++) {
233 JavaVFrame vf = jvframes[fCount];
234 Frame f = vf.getFrame();
235 if (fp.equals(f.getFP())) {
236 StringBuffer sb = new StringBuffer();
237 Method method = vf.getMethod();
238 // a special char to identify java frames in output
239 sb.append("* ");
240 sb.append(method.externalNameAndSignature());
241 sb.append(" bci:" + vf.getBCI());
242 int lineNumber = method.getLineNumberFromBCI(vf.getBCI());
243 if (lineNumber != -1) {
244 sb.append(" line:" + lineNumber);
245 }
246
247 if (verbose) {
248 sb.append(" Method*:" + method.getAddress());
249 }
250
251 if (vf.isCompiledFrame()) {
252 sb.append(" (Compiled frame");
253 if (vf.isDeoptimized()) {
254 sb.append(" [deoptimized]");
255 }
256 } else if (vf.isInterpretedFrame()) {
257 sb.append(" (Interpreted frame");
258 }
259 if (vf.mayBeImpreciseDbg()) {
260 sb.append("; information may be imprecise");
261 }
262 sb.append(")");
263 names.add(sb.toString());
264 }
265 }
266 String[] res = new String[names.size()];
267 System.arraycopy(names.toArray(), 0, res, 0, res.length);
268 return res;
269 }
270 }