1 /*
   2  * Copyright (c) 2003, 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.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       Threads threads = VM.getVM().getThreads();
 204       for (int i = 0; i < threads.getNumberOfThreads(); i++) {
 205          JavaThread cur = threads.getJavaThreadAt(i);
 206          List tmp = new ArrayList(10);
 207          try {
 208             for (JavaVFrame vf = cur.getLastJavaVFrameDbg(); vf != null; vf = vf.javaSender()) {
 209                tmp.add(vf);
 210             }
 211          } catch (Exception exp) {
 212             // may be we may get frames for other threads, continue
 213             // after printing stack trace.
 214             exp.printStackTrace();
 215          }
 216          JavaVFrame[] jvframes = new JavaVFrame[tmp.size()];
 217          System.arraycopy(tmp.toArray(), 0, jvframes, 0, jvframes.length);
 218          jframeCache.put(cur.getThreadProxy(), jvframes);
 219          proxyToThread.put(cur.getThreadProxy(), cur);
 220       }
 221    }
 222 
 223    private void printUnknown(PrintStream out) {
 224       out.println("\t????????");
 225    }
 226 
 227    private String[] getJavaNames(ThreadProxy th, Address fp) {
 228       if (fp == null) {
 229          return null;
 230       }
 231       JavaVFrame[] jvframes = (JavaVFrame[]) jframeCache.get(th);
 232       if (jvframes == null) return null; // not a java thread
 233       List names = new ArrayList(10);
 234       for (int fCount = 0; fCount < jvframes.length; fCount++) {
 235          JavaVFrame vf = jvframes[fCount];
 236          Frame f = vf.getFrame();
 237          if (fp.equals(f.getFP())) {
 238             StringBuffer sb = new StringBuffer();
 239             Method method = vf.getMethod();
 240             // a special char to identify java frames in output
 241             sb.append("* ");
 242             sb.append(method.externalNameAndSignature());
 243             sb.append(" bci:" + vf.getBCI());
 244             int lineNumber = method.getLineNumberFromBCI(vf.getBCI());
 245             if (lineNumber != -1) {
 246                 sb.append(" line:" + lineNumber);
 247             }
 248 
 249             if (verbose) {
 250                sb.append(" Method*:" + method.getAddress());
 251             }
 252 
 253             if (vf.isCompiledFrame()) {
 254                sb.append(" (Compiled frame");
 255                if (vf.isDeoptimized()) {
 256                  sb.append(" [deoptimized]");
 257                }
 258             } else if (vf.isInterpretedFrame()) {
 259                sb.append(" (Interpreted frame");
 260             }
 261             if (vf.mayBeImpreciseDbg()) {
 262                sb.append("; information may be imprecise");
 263             }
 264             sb.append(")");
 265             names.add(sb.toString());
 266          }
 267       }
 268       String[] res = new String[names.size()];
 269       System.arraycopy(names.toArray(), 0, res, 0, res.length);
 270       return res;
 271    }
 272 }
--- EOF ---