rev 58388 : 8237354: Add option to jcmd to write a gzipped heap dump
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   1 /*
   2  * Copyright (c) 1997, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 
  27 /*
  28  * The Original Code is HAT. The Initial Developer of the
  29  * Original Code is Bill Foote, with contributions from others
  30  * at JavaSoft/Sun.
  31  */
  32 
  33 package jdk.test.lib.hprof.parser;
  34 
  35 import java.io.*;
  36 import java.util.Date;
  37 import java.util.Hashtable;
  38 import java.util.Map;
  39 import jdk.test.lib.hprof.model.ArrayTypeCodes;
  40 import jdk.test.lib.hprof.model.*;
  41 
  42 /**
  43  * Object that's used to read a hprof file.
  44  *
  45  * @author      Bill Foote
  46  */
  47 
  48 public class HprofReader extends Reader /* imports */ implements ArrayTypeCodes {
  49 
  50     final static int MAGIC_NUMBER = 0x4a415641;
  51     // That's "JAVA", the first part of "JAVA PROFILE ..."
  52     private final static String[] VERSIONS = {
  53             " PROFILE 1.0\0",
  54             " PROFILE 1.0.1\0",
  55             " PROFILE 1.0.2\0",
  56     };
  57 
  58     private final static int VERSION_JDK12BETA3 = 0;
  59     private final static int VERSION_JDK12BETA4 = 1;
  60     private final static int VERSION_JDK6       = 2;
  61     // These version numbers are indices into VERSIONS.  The instance data
  62     // member version is set to one of these, and it drives decisions when
  63     // reading the file.
  64     //
  65     // Version 1.0.1 added HPROF_GC_PRIM_ARRAY_DUMP, which requires no
  66     // version-sensitive parsing.
  67     //
  68     // Version 1.0.1 changed the type of a constant pool entry from a signature
  69     // to a typecode.
  70     //
  71     // Version 1.0.2 added HPROF_HEAP_DUMP_SEGMENT and HPROF_HEAP_DUMP_END
  72     // to allow a large heap to be dumped as a sequence of heap dump segments.
  73     //
  74     // The HPROF agent in J2SE 1.2 through to 5.0 generate a version 1.0.1
  75     // file. In Java SE 6.0 the version is either 1.0.1 or 1.0.2 depending on
  76     // the size of the heap (normally it will be 1.0.1 but for multi-GB
  77     // heaps the heap dump will not fit in a HPROF_HEAP_DUMP record so the
  78     // dump is generated as version 1.0.2).
  79 
  80     //
  81     // Record types:
  82     //
  83     static final int HPROF_UTF8          = 0x01;
  84     static final int HPROF_LOAD_CLASS    = 0x02;
  85     static final int HPROF_UNLOAD_CLASS  = 0x03;
  86     static final int HPROF_FRAME         = 0x04;
  87     static final int HPROF_TRACE         = 0x05;
  88     static final int HPROF_ALLOC_SITES   = 0x06;
  89     static final int HPROF_HEAP_SUMMARY  = 0x07;
  90 
  91     static final int HPROF_START_THREAD  = 0x0a;
  92     static final int HPROF_END_THREAD    = 0x0b;
  93 
  94     static final int HPROF_HEAP_DUMP     = 0x0c;
  95 
  96     static final int HPROF_CPU_SAMPLES   = 0x0d;
  97     static final int HPROF_CONTROL_SETTINGS = 0x0e;
  98     static final int HPROF_LOCKSTATS_WAIT_TIME = 0x10;
  99     static final int HPROF_LOCKSTATS_HOLD_TIME = 0x11;
 100 
 101     static final int HPROF_GC_ROOT_UNKNOWN       = 0xff;
 102     static final int HPROF_GC_ROOT_JNI_GLOBAL    = 0x01;
 103     static final int HPROF_GC_ROOT_JNI_LOCAL     = 0x02;
 104     static final int HPROF_GC_ROOT_JAVA_FRAME    = 0x03;
 105     static final int HPROF_GC_ROOT_NATIVE_STACK  = 0x04;
 106     static final int HPROF_GC_ROOT_STICKY_CLASS  = 0x05;
 107     static final int HPROF_GC_ROOT_THREAD_BLOCK  = 0x06;
 108     static final int HPROF_GC_ROOT_MONITOR_USED  = 0x07;
 109     static final int HPROF_GC_ROOT_THREAD_OBJ    = 0x08;
 110 
 111     static final int HPROF_GC_CLASS_DUMP         = 0x20;
 112     static final int HPROF_GC_INSTANCE_DUMP      = 0x21;
 113     static final int HPROF_GC_OBJ_ARRAY_DUMP         = 0x22;
 114     static final int HPROF_GC_PRIM_ARRAY_DUMP         = 0x23;
 115 
 116     static final int HPROF_HEAP_DUMP_SEGMENT     = 0x1c;
 117     static final int HPROF_HEAP_DUMP_END         = 0x2c;
 118 
 119     private final static int T_CLASS = 2;
 120 
 121     private int version;        // The version of .hprof being read
 122 
 123     private int debugLevel;
 124     private long currPos;        // Current position in the file
 125 
 126     private int dumpsToSkip;
 127     private boolean callStack;  // If true, read the call stack of objects
 128 
 129     private int identifierSize;         // Size, in bytes, of identifiers.
 130     private Hashtable<Long, String> names;
 131 
 132     // Hashtable<Integer, ThreadObject>, used to map the thread sequence number
 133     // (aka "serial number") to the thread object ID for
 134     // HPROF_GC_ROOT_THREAD_OBJ.  ThreadObject is a trivial inner class,
 135     // at the end of this file.
 136     private Hashtable<Integer, ThreadObject> threadObjects;
 137 
 138     // Hashtable<Long, String>, maps class object ID to class name
 139     // (with / converted to .)
 140     private Hashtable<Long, String> classNameFromObjectID;
 141 
 142     // Hashtable<Integer, Integer>, maps class serial # to class object ID
 143     private Hashtable<Integer, String> classNameFromSerialNo;
 144 
 145     // Hashtable<Long, StackFrame> maps stack frame ID to StackFrame.
 146     // Null if we're not tracking them.
 147     private Hashtable<Long, StackFrame> stackFrames;
 148 
 149     // Hashtable<Integer, StackTrace> maps stack frame ID to StackTrace
 150     // Null if we're not tracking them.
 151     private Hashtable<Integer, StackTrace> stackTraces;
 152 
 153     private Snapshot snapshot;
 154 
 155     public static boolean verifyMagicNumber(int numberRead) {
 156         return (numberRead == MAGIC_NUMBER);
 157     }
 158 
 159     public HprofReader(String fileName, PositionDataInputStream in,
 160                        int dumpNumber, boolean callStack, int debugLevel)
 161                        throws IOException {
 162         super(in);
 163         RandomAccessFile file = new RandomAccessFile(fileName, "r");
 164         this.snapshot = new Snapshot(MappedReadBuffer.create(file));
 165         this.dumpsToSkip = dumpNumber - 1;
 166         this.callStack = callStack;
 167         this.debugLevel = debugLevel;
 168         names = new Hashtable<Long, String>();
 169         threadObjects = new Hashtable<Integer, ThreadObject>(43);
 170         classNameFromObjectID = new Hashtable<Long, String>();
 171         if (callStack) {
 172             stackFrames = new Hashtable<Long, StackFrame>(43);
 173             stackTraces = new Hashtable<Integer, StackTrace>(43);
 174             classNameFromSerialNo = new Hashtable<Integer, String>();
 175         }







 176     }
 177 
 178     public Snapshot read() throws IOException {
 179         currPos = 4;    // 4 because of the magic number
 180         version = readVersionHeader();
 181         identifierSize = in.readInt();
 182         snapshot.setIdentifierSize(identifierSize);
 183         if (version >= VERSION_JDK12BETA4) {
 184             snapshot.setNewStyleArrayClass(true);
 185         } else {
 186             snapshot.setNewStyleArrayClass(false);
 187         }
 188 
 189         currPos += 4;
 190         if (identifierSize != 4 && identifierSize != 8) {
 191             throw new IOException("I'm sorry, but I can't deal with an identifier size of " + identifierSize + ".  I can only deal with 4 or 8.");
 192         }
 193         System.out.println("Dump file created " + (new Date(in.readLong())));
 194         currPos += 8;
 195 
 196         for (;;) {
 197             int type;
 198             try {
 199                 type = in.readUnsignedByte();
 200             } catch (EOFException ignored) {
 201                 break;
 202             }
 203             in.readInt();       // Timestamp of this record
 204             // Length of record: readInt() will return negative value for record
 205             // length >2GB.  so store 32bit value in long to keep it unsigned.
 206             long length = in.readInt() & 0xffffffffL;
 207             if (debugLevel > 0) {
 208                 System.out.println("Read record type " + type
 209                                    + ", length " + length
 210                                    + " at position " + toHex(currPos));
 211             }
 212             if (length < 0) {
 213                 throw new IOException("Bad record length of " + length
 214                                       + " at byte " + toHex(currPos+5)
 215                                       + " of file.");
 216             }
 217             currPos += 9 + length;
 218             switch (type) {
 219                 case HPROF_UTF8: {
 220                     long id = readID();
 221                     byte[] chars = new byte[(int)length - identifierSize];
 222                     in.readFully(chars);
 223                     names.put(id, new String(chars));
 224                     break;
 225                 }
 226                 case HPROF_LOAD_CLASS: {
 227                     int serialNo = in.readInt();        // Not used
 228                     long classID = readID();
 229                     int stackTraceSerialNo = in.readInt();
 230                     long classNameID = readID();
 231                     Long classIdI = classID;
 232                     String nm = getNameFromID(classNameID).replace('/', '.');
 233                     classNameFromObjectID.put(classIdI, nm);
 234                     if (classNameFromSerialNo != null) {
 235                         classNameFromSerialNo.put(serialNo, nm);
 236                     }
 237                     break;
 238                 }
 239 
 240                 case HPROF_HEAP_DUMP: {
 241                     if (dumpsToSkip <= 0) {
 242                         try {
 243                             readHeapDump(length, currPos);
 244                         } catch (EOFException exp) {
 245                             handleEOF(exp, snapshot);
 246                         }
 247                         if (debugLevel > 0) {
 248                             System.out.println("    Finished processing instances in heap dump.");
 249                         }
 250                         return snapshot;
 251                     } else {
 252                         dumpsToSkip--;
 253                         skipBytes(length);
 254                     }
 255                     break;
 256                 }
 257 
 258                 case HPROF_HEAP_DUMP_END: {
 259                     if (version >= VERSION_JDK6) {
 260                         if (dumpsToSkip <= 0) {
 261                             skipBytes(length);  // should be no-op
 262                             return snapshot;
 263                         } else {
 264                             // skip this dump (of the end record for a sequence of dump segments)
 265                             dumpsToSkip--;
 266                         }
 267                     } else {
 268                         // HPROF_HEAP_DUMP_END only recognized in >= 1.0.2
 269                         warn("Ignoring unrecognized record type " + type);
 270                     }
 271                     skipBytes(length);  // should be no-op
 272                     break;
 273                 }
 274 
 275                 case HPROF_HEAP_DUMP_SEGMENT: {
 276                     if (version >= VERSION_JDK6) {
 277                         if (dumpsToSkip <= 0) {
 278                             try {
 279                                 // read the dump segment
 280                                 readHeapDump(length, currPos);
 281                             } catch (EOFException exp) {
 282                                 handleEOF(exp, snapshot);
 283                             }
 284                         } else {
 285                             // all segments comprising the heap dump will be skipped
 286                             skipBytes(length);
 287                         }
 288                     } else {
 289                         // HPROF_HEAP_DUMP_SEGMENT only recognized in >= 1.0.2
 290                         warn("Ignoring unrecognized record type " + type);
 291                         skipBytes(length);
 292                     }
 293                     break;
 294                 }
 295 
 296                 case HPROF_FRAME: {
 297                     if (stackFrames == null) {
 298                         skipBytes(length);
 299                     } else {
 300                         long id = readID();
 301                         String methodName = getNameFromID(readID());
 302                         String methodSig = getNameFromID(readID());
 303                         String sourceFile = getNameFromID(readID());
 304                         int classSer = in.readInt();
 305                         String className = classNameFromSerialNo.get(classSer);
 306                         int lineNumber = in.readInt();
 307                         if (lineNumber < StackFrame.LINE_NUMBER_NATIVE) {
 308                             warn("Weird stack frame line number:  " + lineNumber);
 309                             lineNumber = StackFrame.LINE_NUMBER_UNKNOWN;
 310                         }
 311                         stackFrames.put(id,
 312                                         new StackFrame(methodName, methodSig,
 313                                                        className, sourceFile,
 314                                                        lineNumber));
 315                     }
 316                     break;
 317                 }
 318                 case HPROF_TRACE: {
 319                     if (stackTraces == null) {
 320                         skipBytes(length);
 321                     } else {
 322                         int serialNo = in.readInt();
 323                         int threadSeq = in.readInt();   // Not used
 324                         StackFrame[] frames = new StackFrame[in.readInt()];
 325                         for (int i = 0; i < frames.length; i++) {
 326                             long fid = readID();
 327                             frames[i] = stackFrames.get(fid);
 328                             if (frames[i] == null) {
 329                                 throw new IOException("Stack frame " + toHex(fid) + " not found");
 330                             }
 331                         }
 332                         stackTraces.put(serialNo,
 333                                         new StackTrace(frames));
 334                     }
 335                     break;
 336                 }
 337                 case HPROF_UNLOAD_CLASS:
 338                 case HPROF_ALLOC_SITES:
 339                 case HPROF_START_THREAD:
 340                 case HPROF_END_THREAD:
 341                 case HPROF_HEAP_SUMMARY:
 342                 case HPROF_CPU_SAMPLES:
 343                 case HPROF_CONTROL_SETTINGS:
 344                 case HPROF_LOCKSTATS_WAIT_TIME:
 345                 case HPROF_LOCKSTATS_HOLD_TIME:
 346                 {
 347                     // Ignore these record types
 348                     skipBytes(length);
 349                     break;
 350                 }
 351                 default: {
 352                     skipBytes(length);
 353                     warn("Ignoring unrecognized record type " + type);
 354                 }
 355             }
 356         }
 357 
 358         return snapshot;
 359     }
 360 
 361     public String printStackTraces() {
 362         StringBuffer output = new StringBuffer();
 363         for (Map.Entry<Integer, StackTrace> entry : stackTraces.entrySet()) {
 364             StackFrame[] frames = entry.getValue().getFrames();
 365             output.append("SerialNo " + entry.getKey() + "\n");
 366             for (int i = 0; i < frames.length; i++) {
 367                 output.append("  " + frames[i].getClassName() + "." + frames[i].getMethodName()
 368                         + frames[i].getMethodSignature() + " (" + frames[i].getSourceFileName()
 369                         + ":" + frames[i].getLineNumber() + ")" + "\n");
 370             }
 371         }
 372 
 373         System.out.println(output);
 374         return output.toString();
 375     }
 376 
 377     private void skipBytes(long length) throws IOException {
 378         while (length > 0) {
 379             long skipped = in.skip(length);
 380             if (skipped == 0) {
 381                 // EOF or other problem, throw exception
 382                 throw new EOFException("Couldn't skip enough bytes");
 383             }
 384             length -= skipped;
 385         }
 386     }
 387 
 388     private int readVersionHeader() throws IOException {
 389         int candidatesLeft = VERSIONS.length;
 390         boolean[] matched = new boolean[VERSIONS.length];
 391         for (int i = 0; i < candidatesLeft; i++) {
 392             matched[i] = true;
 393         }
 394 
 395         int pos = 0;
 396         while (candidatesLeft > 0) {
 397             char c = (char) in.readByte();
 398             currPos++;
 399             for (int i = 0; i < VERSIONS.length; i++) {
 400                 if (matched[i]) {
 401                     if (c != VERSIONS[i].charAt(pos)) {   // Not matched
 402                         matched[i] = false;
 403                         --candidatesLeft;
 404                     } else if (pos == VERSIONS[i].length() - 1) {  // Full match
 405                         return i;
 406                     }
 407                 }
 408             }
 409             ++pos;
 410         }
 411         throw new IOException("Version string not recognized at byte " + (pos+3));
 412     }
 413 
 414     private void readHeapDump(long bytesLeft, long posAtEnd) throws IOException {
 415         while (bytesLeft > 0) {
 416             int type = in.readUnsignedByte();
 417             if (debugLevel > 0) {
 418                 System.out.println("    Read heap sub-record type " + type
 419                                    + " at position "
 420                                    + toHex(posAtEnd - bytesLeft));
 421             }
 422             bytesLeft--;
 423             switch(type) {
 424                 case HPROF_GC_ROOT_UNKNOWN: {
 425                     long id = readID();
 426                     bytesLeft -= identifierSize;
 427                     snapshot.addRoot(new Root(id, 0, Root.UNKNOWN, ""));
 428                     break;
 429                 }
 430                 case HPROF_GC_ROOT_THREAD_OBJ: {
 431                     long id = readID();
 432                     int threadSeq = in.readInt();
 433                     int stackSeq = in.readInt();
 434                     bytesLeft -= identifierSize + 8;
 435                     threadObjects.put(threadSeq,
 436                                       new ThreadObject(id, stackSeq));
 437                     break;
 438                 }
 439                 case HPROF_GC_ROOT_JNI_GLOBAL: {
 440                     long id = readID();
 441                     long globalRefId = readID();        // Ignored, for now
 442                     bytesLeft -= 2*identifierSize;
 443                     snapshot.addRoot(new Root(id, 0, Root.NATIVE_STATIC, ""));
 444                     break;
 445                 }
 446                 case HPROF_GC_ROOT_JNI_LOCAL: {
 447                     long id = readID();
 448                     int threadSeq = in.readInt();
 449                     int depth = in.readInt();
 450                     bytesLeft -= identifierSize + 8;
 451                     ThreadObject to = getThreadObjectFromSequence(threadSeq);
 452                     StackTrace st = getStackTraceFromSerial(to.stackSeq);
 453                     if (st != null) {
 454                         st = st.traceForDepth(depth+1);
 455                     }
 456                     snapshot.addRoot(new Root(id, to.threadId,
 457                                               Root.NATIVE_LOCAL, "", st));
 458                     break;
 459                 }
 460                 case HPROF_GC_ROOT_JAVA_FRAME: {
 461                     long id = readID();
 462                     int threadSeq = in.readInt();
 463                     int depth = in.readInt();
 464                     bytesLeft -= identifierSize + 8;
 465                     ThreadObject to = getThreadObjectFromSequence(threadSeq);
 466                     StackTrace st = getStackTraceFromSerial(to.stackSeq);
 467                     if (st != null) {
 468                         st = st.traceForDepth(depth+1);
 469                     }
 470                     snapshot.addRoot(new Root(id, to.threadId,
 471                                               Root.JAVA_LOCAL, "", st));
 472                     break;
 473                 }
 474                 case HPROF_GC_ROOT_NATIVE_STACK: {
 475                     long id = readID();
 476                     int threadSeq = in.readInt();
 477                     bytesLeft -= identifierSize + 4;
 478                     ThreadObject to = getThreadObjectFromSequence(threadSeq);
 479                     StackTrace st = getStackTraceFromSerial(to.stackSeq);
 480                     snapshot.addRoot(new Root(id, to.threadId,
 481                                               Root.NATIVE_STACK, "", st));
 482                     break;
 483                 }
 484                 case HPROF_GC_ROOT_STICKY_CLASS: {
 485                     long id = readID();
 486                     bytesLeft -= identifierSize;
 487                     snapshot.addRoot(new Root(id, 0, Root.SYSTEM_CLASS, ""));
 488                     break;
 489                 }
 490                 case HPROF_GC_ROOT_THREAD_BLOCK: {
 491                     long id = readID();
 492                     int threadSeq = in.readInt();
 493                     bytesLeft -= identifierSize + 4;
 494                     ThreadObject to = getThreadObjectFromSequence(threadSeq);
 495                     StackTrace st = getStackTraceFromSerial(to.stackSeq);
 496                     snapshot.addRoot(new Root(id, to.threadId,
 497                                      Root.THREAD_BLOCK, "", st));
 498                     break;
 499                 }
 500                 case HPROF_GC_ROOT_MONITOR_USED: {
 501                     long id = readID();
 502                     bytesLeft -= identifierSize;
 503                     snapshot.addRoot(new Root(id, 0, Root.BUSY_MONITOR, ""));
 504                     break;
 505                 }
 506                 case HPROF_GC_CLASS_DUMP: {
 507                     int bytesRead = readClass();
 508                     bytesLeft -= bytesRead;
 509                     break;
 510                 }
 511                 case HPROF_GC_INSTANCE_DUMP: {
 512                     int bytesRead = readInstance();
 513                     bytesLeft -= bytesRead;
 514                     break;
 515                 }
 516                 case HPROF_GC_OBJ_ARRAY_DUMP: {
 517                     long bytesRead = readArray(false);
 518                     bytesLeft -= bytesRead;
 519                     break;
 520                 }
 521                 case HPROF_GC_PRIM_ARRAY_DUMP: {
 522                     long bytesRead = readArray(true);
 523                     bytesLeft -= bytesRead;
 524                     break;
 525                 }
 526                 default: {
 527                     throw new IOException("Unrecognized heap dump sub-record type:  " + type);
 528                 }
 529             }
 530         }
 531         if (bytesLeft != 0) {
 532             warn("Error reading heap dump or heap dump segment:  Byte count is " + bytesLeft + " instead of 0");
 533             skipBytes(bytesLeft);
 534         }
 535         if (debugLevel > 0) {
 536             System.out.println("    Finished heap sub-records.");
 537         }
 538     }
 539 
 540     private long readID() throws IOException {
 541         return (identifierSize == 4)?
 542             (Snapshot.SMALL_ID_MASK & (long)in.readInt()) : in.readLong();
 543     }
 544 
 545     //
 546     // Read a java value.  If result is non-null, it's expected to be an
 547     // array of one element.  We use it to fake multiple return values.
 548     // @returns the number of bytes read
 549     //
 550     private int readValue(JavaThing[] resultArr) throws IOException {
 551         byte type = in.readByte();
 552         return 1 + readValueForType(type, resultArr);
 553     }
 554 
 555     private int readValueForType(byte type, JavaThing[] resultArr)
 556             throws IOException {
 557         if (version >= VERSION_JDK12BETA4) {
 558             type = signatureFromTypeId(type);
 559         }
 560         return readValueForTypeSignature(type, resultArr);
 561     }
 562 
 563     private int readValueForTypeSignature(byte type, JavaThing[] resultArr)
 564             throws IOException {
 565         switch (type) {
 566             case '[':
 567             case 'L': {
 568                 long id = readID();
 569                 if (resultArr != null) {
 570                     resultArr[0] = new JavaObjectRef(id);
 571                 }
 572                 return identifierSize;
 573             }
 574             case 'Z': {
 575                 int b = in.readByte();
 576                 if (b != 0 && b != 1) {
 577                     warn("Illegal boolean value read");
 578                 }
 579                 if (resultArr != null) {
 580                     resultArr[0] = new JavaBoolean(b != 0);
 581                 }
 582                 return 1;
 583             }
 584             case 'B': {
 585                 byte b = in.readByte();
 586                 if (resultArr != null) {
 587                     resultArr[0] = new JavaByte(b);
 588                 }
 589                 return 1;
 590             }
 591             case 'S': {
 592                 short s = in.readShort();
 593                 if (resultArr != null) {
 594                     resultArr[0] = new JavaShort(s);
 595                 }
 596                 return 2;
 597             }
 598             case 'C': {
 599                 char ch = in.readChar();
 600                 if (resultArr != null) {
 601                     resultArr[0] = new JavaChar(ch);
 602                 }
 603                 return 2;
 604             }
 605             case 'I': {
 606                 int val = in.readInt();
 607                 if (resultArr != null) {
 608                     resultArr[0] = new JavaInt(val);
 609                 }
 610                 return 4;
 611             }
 612             case 'J': {
 613                 long val = in.readLong();
 614                 if (resultArr != null) {
 615                     resultArr[0] = new JavaLong(val);
 616                 }
 617                 return 8;
 618             }
 619             case 'F': {
 620                 float val = in.readFloat();
 621                 if (resultArr != null) {
 622                     resultArr[0] = new JavaFloat(val);
 623                 }
 624                 return 4;
 625             }
 626             case 'D': {
 627                 double val = in.readDouble();
 628                 if (resultArr != null) {
 629                     resultArr[0] = new JavaDouble(val);
 630                 }
 631                 return 8;
 632             }
 633             default: {
 634                 throw new IOException("Bad value signature:  " + type);
 635             }
 636         }
 637     }
 638 
 639     private ThreadObject getThreadObjectFromSequence(int threadSeq)
 640             throws IOException {
 641         ThreadObject to = threadObjects.get(threadSeq);
 642         if (to == null) {
 643             throw new IOException("Thread " + threadSeq +
 644                                   " not found for JNI local ref");
 645         }
 646         return to;
 647     }
 648 
 649     private String getNameFromID(long id) throws IOException {
 650         return getNameFromID(Long.valueOf(id));
 651     }
 652 
 653     private String getNameFromID(Long id) throws IOException {
 654         if (id.longValue() == 0L) {
 655             return "";
 656         }
 657         String result = names.get(id);
 658         if (result == null) {
 659             warn("Name not found at " + toHex(id.longValue()));
 660             return "unresolved name " + toHex(id.longValue());
 661         }
 662         return result;
 663     }
 664 
 665     private StackTrace getStackTraceFromSerial(int ser) throws IOException {
 666         if (stackTraces == null) {
 667             return null;
 668         }
 669         StackTrace result = stackTraces.get(ser);
 670         if (result == null) {
 671             warn("Stack trace not found for serial # " + ser);
 672         }
 673         return result;
 674     }
 675 
 676     //
 677     // Handle a HPROF_GC_CLASS_DUMP
 678     // Return number of bytes read
 679     //
 680     private int readClass() throws IOException {
 681         long id = readID();
 682         StackTrace stackTrace = getStackTraceFromSerial(in.readInt());
 683         long superId = readID();
 684         long classLoaderId = readID();
 685         long signersId = readID();
 686         long protDomainId = readID();
 687         long reserved1 = readID();
 688         long reserved2 = readID();
 689         int instanceSize = in.readInt();
 690         int bytesRead = 7 * identifierSize + 8;
 691 
 692         int numConstPoolEntries = in.readUnsignedShort();
 693         bytesRead += 2;
 694         for (int i = 0; i < numConstPoolEntries; i++) {
 695             int index = in.readUnsignedShort(); // unused
 696             bytesRead += 2;
 697             bytesRead += readValue(null);       // We ignore the values
 698         }
 699 
 700         int numStatics = in.readUnsignedShort();
 701         bytesRead += 2;
 702         JavaThing[] valueBin = new JavaThing[1];
 703         JavaStatic[] statics = new JavaStatic[numStatics];
 704         for (int i = 0; i < numStatics; i++) {
 705             long nameId = readID();
 706             bytesRead += identifierSize;
 707             byte type = in.readByte();
 708             bytesRead++;
 709             bytesRead += readValueForType(type, valueBin);
 710             String fieldName = getNameFromID(nameId);
 711             if (version >= VERSION_JDK12BETA4) {
 712                 type = signatureFromTypeId(type);
 713             }
 714             String signature = "" + ((char) type);
 715             JavaField f = new JavaField(fieldName, signature);
 716             statics[i] = new JavaStatic(f, valueBin[0]);
 717         }
 718 
 719         int numFields = in.readUnsignedShort();
 720         bytesRead += 2;
 721         JavaField[] fields = new JavaField[numFields];
 722         for (int i = 0; i < numFields; i++) {
 723             long nameId = readID();
 724             bytesRead += identifierSize;
 725             byte type = in.readByte();
 726             bytesRead++;
 727             String fieldName = getNameFromID(nameId);
 728             if (version >= VERSION_JDK12BETA4) {
 729                 type = signatureFromTypeId(type);
 730             }
 731             String signature = "" + ((char) type);
 732             fields[i] = new JavaField(fieldName, signature);
 733         }
 734         String name = classNameFromObjectID.get(id);
 735         if (name == null) {
 736             warn("Class name not found for " + toHex(id));
 737             name = "unknown-name@" + toHex(id);
 738         }
 739         JavaClass c = new JavaClass(id, name, superId, classLoaderId, signersId,
 740                                     protDomainId, fields, statics,
 741                                     instanceSize);
 742         snapshot.addClass(id, c);
 743         snapshot.setSiteTrace(c, stackTrace);
 744 
 745         return bytesRead;
 746     }
 747 
 748     private String toHex(long addr) {
 749         return jdk.test.lib.hprof.util.Misc.toHex(addr);
 750     }
 751 
 752     //
 753     // Handle a HPROF_GC_INSTANCE_DUMP
 754     // Return number of bytes read
 755     //
 756     private int readInstance() throws IOException {
 757         long start = in.position();
 758         long id = readID();
 759         StackTrace stackTrace = getStackTraceFromSerial(in.readInt());
 760         long classID = readID();
 761         JavaClass searchedClass = snapshot.findClass(
 762                                   "0x" + Long.toHexString(classID));
 763         if (searchedClass == null) {
 764             throw new IOException(
 765                 "Class Record for 0x" + Long.toHexString(classID) + " not found");
 766         }
 767         int bytesFollowing = in.readInt();
 768         int bytesRead = (2 * identifierSize) + 8 + bytesFollowing;
 769         JavaObject jobj = new JavaObject(classID, start);
 770         skipBytes(bytesFollowing);
 771         snapshot.addHeapObject(id, jobj);
 772         snapshot.setSiteTrace(jobj, stackTrace);
 773         return bytesRead;
 774     }
 775 
 776     //
 777     // Handle a HPROF_GC_OBJ_ARRAY_DUMP or HPROF_GC_PRIM_ARRAY_DUMP
 778     // Return number of bytes read
 779     //
 780     private long readArray(boolean isPrimitive) throws IOException {
 781         long start = in.position();
 782         long id = readID();
 783         StackTrace stackTrace = getStackTraceFromSerial(in.readInt());
 784         int num = in.readInt();
 785         long bytesRead = identifierSize + 8;
 786         long elementClassID;
 787         if (isPrimitive) {
 788             elementClassID = in.readByte();
 789             bytesRead++;
 790         } else {
 791             elementClassID = readID();
 792             bytesRead += identifierSize;
 793         }
 794 
 795         // Check for primitive arrays:
 796         byte primitiveSignature = 0x00;
 797         int elSize = 0;
 798         if (isPrimitive || version < VERSION_JDK12BETA4) {
 799             switch ((int)elementClassID) {
 800                 case T_BOOLEAN: {
 801                     primitiveSignature = (byte) 'Z';
 802                     elSize = 1;
 803                     break;
 804                 }
 805                 case T_CHAR: {
 806                     primitiveSignature = (byte) 'C';
 807                     elSize = 2;
 808                     break;
 809                 }
 810                 case T_FLOAT: {
 811                     primitiveSignature = (byte) 'F';
 812                     elSize = 4;
 813                     break;
 814                 }
 815                 case T_DOUBLE: {
 816                     primitiveSignature = (byte) 'D';
 817                     elSize = 8;
 818                     break;
 819                 }
 820                 case T_BYTE: {
 821                     primitiveSignature = (byte) 'B';
 822                     elSize = 1;
 823                     break;
 824                 }
 825                 case T_SHORT: {
 826                     primitiveSignature = (byte) 'S';
 827                     elSize = 2;
 828                     break;
 829                 }
 830                 case T_INT: {
 831                     primitiveSignature = (byte) 'I';
 832                     elSize = 4;
 833                     break;
 834                 }
 835                 case T_LONG: {
 836                     primitiveSignature = (byte) 'J';
 837                     elSize = 8;
 838                     break;
 839                 }
 840             }
 841             if (version >= VERSION_JDK12BETA4 && primitiveSignature == 0x00) {
 842                 throw new IOException("Unrecognized typecode:  "
 843                                         + elementClassID);
 844             }
 845         }
 846         if (primitiveSignature != 0x00) {
 847             long size = elSize * (long)num;
 848             bytesRead += size;
 849             JavaValueArray va = new JavaValueArray(primitiveSignature, start);
 850             skipBytes(size);
 851             snapshot.addHeapObject(id, va);
 852             snapshot.setSiteTrace(va, stackTrace);
 853         } else {
 854             long sz = (long)num * identifierSize;
 855             bytesRead += sz;
 856             JavaObjectArray arr = new JavaObjectArray(elementClassID, start);
 857             skipBytes(sz);
 858             snapshot.addHeapObject(id, arr);
 859             snapshot.setSiteTrace(arr, stackTrace);
 860         }
 861         return bytesRead;
 862     }
 863 
 864     private byte signatureFromTypeId(byte typeId) throws IOException {
 865         switch (typeId) {
 866             case T_CLASS: {
 867                 return (byte) 'L';
 868             }
 869             case T_BOOLEAN: {
 870                 return (byte) 'Z';
 871             }
 872             case T_CHAR: {
 873                 return (byte) 'C';
 874             }
 875             case T_FLOAT: {
 876                 return (byte) 'F';
 877             }
 878             case T_DOUBLE: {
 879                 return (byte) 'D';
 880             }
 881             case T_BYTE: {
 882                 return (byte) 'B';
 883             }
 884             case T_SHORT: {
 885                 return (byte) 'S';
 886             }
 887             case T_INT: {
 888                 return (byte) 'I';
 889             }
 890             case T_LONG: {
 891                 return (byte) 'J';
 892             }
 893             default: {
 894                 throw new IOException("Invalid type id of " + typeId);
 895             }
 896         }
 897     }
 898 
 899     private void handleEOF(EOFException exp, Snapshot snapshot) {
 900         if (debugLevel > 0) {
 901             exp.printStackTrace();
 902         }
 903         warn("Unexpected EOF. Will miss information...");
 904         // we have EOF, we have to tolerate missing references
 905         snapshot.setUnresolvedObjectsOK(true);
 906     }
 907 
 908     private void warn(String msg) {
 909         System.out.println("WARNING: " + msg);
 910     }
 911 
 912     //
 913     // A trivial data-holder class for HPROF_GC_ROOT_THREAD_OBJ.
 914     //
 915     private class ThreadObject {
 916 
 917         long threadId;
 918         int stackSeq;
 919 
 920         ThreadObject(long threadId, int stackSeq) {
 921             this.threadId = threadId;
 922             this.stackSeq = stackSeq;
 923         }
 924     }
 925 
 926 }
--- EOF ---