/*
 * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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/*
 * The Original Code is HAT. The Initial Developer of the
 * Original Code is Bill Foote, with contributions from others
 * at JavaSoft/Sun.
 */

package com.sun.tools.hat.internal.parser;

import java.io.*;
import java.util.Date;
import java.util.Hashtable;
import com.sun.tools.hat.internal.model.ArrayTypeCodes;
import com.sun.tools.hat.internal.model.*;

Object that's used to read a hprof file.
Author: Bill Foote
/** * Object that's used to read a hprof file. * * @author Bill Foote */
public class HprofReader extends Reader /* imports */ implements ArrayTypeCodes { final static int MAGIC_NUMBER = 0x4a415641; // That's "JAVA", the first part of "JAVA PROFILE ..." private final static String[] VERSIONS = { " PROFILE 1.0\0", " PROFILE 1.0.1\0", " PROFILE 1.0.2\0", }; private final static int VERSION_JDK12BETA3 = 0; private final static int VERSION_JDK12BETA4 = 1; private final static int VERSION_JDK6 = 2; // These version numbers are indices into VERSIONS. The instance data // member version is set to one of these, and it drives decisions when // reading the file. // // Version 1.0.1 added HPROF_GC_PRIM_ARRAY_DUMP, which requires no // version-sensitive parsing. // // Version 1.0.1 changed the type of a constant pool entry from a signature // to a typecode. // // Version 1.0.2 added HPROF_HEAP_DUMP_SEGMENT and HPROF_HEAP_DUMP_END // to allow a large heap to be dumped as a sequence of heap dump segments. // // The HPROF agent in J2SE 1.2 through to 5.0 generate a version 1.0.1 // file. In Java SE 6.0 the version is either 1.0.1 or 1.0.2 depending on // the size of the heap (normally it will be 1.0.1 but for multi-GB // heaps the heap dump will not fit in a HPROF_HEAP_DUMP record so the // dump is generated as version 1.0.2). // // Record types: // static final int HPROF_UTF8 = 0x01; static final int HPROF_LOAD_CLASS = 0x02; static final int HPROF_UNLOAD_CLASS = 0x03; static final int HPROF_FRAME = 0x04; static final int HPROF_TRACE = 0x05; static final int HPROF_ALLOC_SITES = 0x06; static final int HPROF_HEAP_SUMMARY = 0x07; static final int HPROF_START_THREAD = 0x0a; static final int HPROF_END_THREAD = 0x0b; static final int HPROF_HEAP_DUMP = 0x0c; static final int HPROF_CPU_SAMPLES = 0x0d; static final int HPROF_CONTROL_SETTINGS = 0x0e; static final int HPROF_LOCKSTATS_WAIT_TIME = 0x10; static final int HPROF_LOCKSTATS_HOLD_TIME = 0x11; static final int HPROF_GC_ROOT_UNKNOWN = 0xff; static final int HPROF_GC_ROOT_JNI_GLOBAL = 0x01; static final int HPROF_GC_ROOT_JNI_LOCAL = 0x02; static final int HPROF_GC_ROOT_JAVA_FRAME = 0x03; static final int HPROF_GC_ROOT_NATIVE_STACK = 0x04; static final int HPROF_GC_ROOT_STICKY_CLASS = 0x05; static final int HPROF_GC_ROOT_THREAD_BLOCK = 0x06; static final int HPROF_GC_ROOT_MONITOR_USED = 0x07; static final int HPROF_GC_ROOT_THREAD_OBJ = 0x08; static final int HPROF_GC_CLASS_DUMP = 0x20; static final int HPROF_GC_INSTANCE_DUMP = 0x21; static final int HPROF_GC_OBJ_ARRAY_DUMP = 0x22; static final int HPROF_GC_PRIM_ARRAY_DUMP = 0x23; static final int HPROF_HEAP_DUMP_SEGMENT = 0x1c; static final int HPROF_HEAP_DUMP_END = 0x2c; private final static int T_CLASS = 2; private int version; // The version of .hprof being read private int debugLevel; private long currPos; // Current position in the file private int dumpsToSkip; private boolean callStack; // If true, read the call stack of objects private int identifierSize; // Size, in bytes, of identifiers. private Hashtable<Long, String> names; // Hashtable<Integer, ThreadObject>, used to map the thread sequence number // (aka "serial number") to the thread object ID for // HPROF_GC_ROOT_THREAD_OBJ. ThreadObject is a trivial inner class, // at the end of this file. private Hashtable<Integer, ThreadObject> threadObjects; // Hashtable<Long, String>, maps class object ID to class name // (with / converted to .) private Hashtable<Long, String> classNameFromObjectID; // Hashtable<Integer, Integer>, maps class serial # to class object ID private Hashtable<Integer, String> classNameFromSerialNo; // Hashtable<Long, StackFrame> maps stack frame ID to StackFrame. // Null if we're not tracking them. private Hashtable<Long, StackFrame> stackFrames; // Hashtable<Integer, StackTrace> maps stack frame ID to StackTrace // Null if we're not tracking them. private Hashtable<Integer, StackTrace> stackTraces; private Snapshot snapshot; public HprofReader(String fileName, PositionDataInputStream in, int dumpNumber, boolean callStack, int debugLevel) throws IOException { super(in); RandomAccessFile file = new RandomAccessFile(fileName, "r"); this.snapshot = new Snapshot(MappedReadBuffer.create(file)); this.dumpsToSkip = dumpNumber - 1; this.callStack = callStack; this.debugLevel = debugLevel; names = new Hashtable<Long, String>(); threadObjects = new Hashtable<Integer, ThreadObject>(43); classNameFromObjectID = new Hashtable<Long, String>(); if (callStack) { stackFrames = new Hashtable<Long, StackFrame>(43); stackTraces = new Hashtable<Integer, StackTrace>(43); classNameFromSerialNo = new Hashtable<Integer, String>(); } } public Snapshot read() throws IOException { currPos = 4; // 4 because of the magic number version = readVersionHeader(); identifierSize = in.readInt(); snapshot.setIdentifierSize(identifierSize); if (version >= VERSION_JDK12BETA4) { snapshot.setNewStyleArrayClass(true); } else { snapshot.setNewStyleArrayClass(false); } currPos += 4; if (identifierSize != 4 && identifierSize != 8) { 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."); } System.out.println("Dump file created " + (new Date(in.readLong()))); currPos += 8; for (;;) { int type; try { type = in.readUnsignedByte(); } catch (EOFException ignored) { break; } in.readInt(); // Timestamp of this record // Length of record: readInt() will return negative value for record // length >2GB. so store 32bit value in long to keep it unsigned. long length = in.readInt() & 0xffffffffL; if (debugLevel > 0) { System.out.println("Read record type " + type + ", length " + length + " at position " + toHex(currPos)); } if (length < 0) { throw new IOException("Bad record length of " + length + " at byte " + toHex(currPos+5) + " of file."); } currPos += 9 + length; switch (type) { case HPROF_UTF8: { long id = readID(); byte[] chars = new byte[(int)length - identifierSize]; in.readFully(chars); names.put(new Long(id), new String(chars)); break; } case HPROF_LOAD_CLASS: { int serialNo = in.readInt(); // Not used long classID = readID(); int stackTraceSerialNo = in.readInt(); long classNameID = readID(); Long classIdI = new Long(classID); String nm = getNameFromID(classNameID).replace('/', '.'); classNameFromObjectID.put(classIdI, nm); if (classNameFromSerialNo != null) { classNameFromSerialNo.put(new Integer(serialNo), nm); } break; } case HPROF_HEAP_DUMP: { if (dumpsToSkip <= 0) { try { readHeapDump(length, currPos); } catch (EOFException exp) { handleEOF(exp, snapshot); } if (debugLevel > 0) { System.out.println(" Finished processing instances in heap dump."); } return snapshot; } else { dumpsToSkip--; skipBytes(length); } break; } case HPROF_HEAP_DUMP_END: { if (version >= VERSION_JDK6) { if (dumpsToSkip <= 0) { skipBytes(length); // should be no-op return snapshot; } else { // skip this dump (of the end record for a sequence of dump segments) dumpsToSkip--; } } else { // HPROF_HEAP_DUMP_END only recognized in >= 1.0.2 warn("Ignoring unrecognized record type " + type); } skipBytes(length); // should be no-op break; } case HPROF_HEAP_DUMP_SEGMENT: { if (version >= VERSION_JDK6) { if (dumpsToSkip <= 0) { try { // read the dump segment readHeapDump(length, currPos); } catch (EOFException exp) { handleEOF(exp, snapshot); } } else { // all segments comprising the heap dump will be skipped skipBytes(length); } } else { // HPROF_HEAP_DUMP_SEGMENT only recognized in >= 1.0.2 warn("Ignoring unrecognized record type " + type); skipBytes(length); } break; } case HPROF_FRAME: { if (stackFrames == null) { skipBytes(length); } else { long id = readID(); String methodName = getNameFromID(readID()); String methodSig = getNameFromID(readID()); String sourceFile = getNameFromID(readID()); int classSer = in.readInt(); String className = classNameFromSerialNo.get(new Integer(classSer)); int lineNumber = in.readInt(); if (lineNumber < StackFrame.LINE_NUMBER_NATIVE) { warn("Weird stack frame line number: " + lineNumber); lineNumber = StackFrame.LINE_NUMBER_UNKNOWN; } stackFrames.put(new Long(id), new StackFrame(methodName, methodSig, className, sourceFile, lineNumber)); } break; } case HPROF_TRACE: { if (stackTraces == null) { skipBytes(length); } else { int serialNo = in.readInt(); int threadSeq = in.readInt(); // Not used StackFrame[] frames = new StackFrame[in.readInt()]; for (int i = 0; i < frames.length; i++) { long fid = readID(); frames[i] = stackFrames.get(new Long(fid)); if (frames[i] == null) { throw new IOException("Stack frame " + toHex(fid) + " not found"); } } stackTraces.put(new Integer(serialNo), new StackTrace(frames)); } break; } case HPROF_UNLOAD_CLASS: case HPROF_ALLOC_SITES: case HPROF_START_THREAD: case HPROF_END_THREAD: case HPROF_HEAP_SUMMARY: case HPROF_CPU_SAMPLES: case HPROF_CONTROL_SETTINGS: case HPROF_LOCKSTATS_WAIT_TIME: case HPROF_LOCKSTATS_HOLD_TIME: { // Ignore these record types skipBytes(length); break; } default: { skipBytes(length); warn("Ignoring unrecognized record type " + type); } } } return snapshot; } private void skipBytes(long length) throws IOException { while (length > 0) { long skipped = in.skip(length); length -= skipped; if (skipped == 0) { // EOF or other problem, throw exception throw new EOFException("Couldn't skip enough bytes"); } } } private int readVersionHeader() throws IOException { int candidatesLeft = VERSIONS.length; boolean[] matched = new boolean[VERSIONS.length]; for (int i = 0; i < candidatesLeft; i++) { matched[i] = true; } int pos = 0; while (candidatesLeft > 0) { char c = (char) in.readByte(); currPos++; for (int i = 0; i < VERSIONS.length; i++) { if (matched[i]) { if (c != VERSIONS[i].charAt(pos)) { // Not matched matched[i] = false; --candidatesLeft; } else if (pos == VERSIONS[i].length() - 1) { // Full match return i; } } } ++pos; } throw new IOException("Version string not recognized at byte " + (pos+3)); } private void readHeapDump(long bytesLeft, long posAtEnd) throws IOException { while (bytesLeft > 0) { int type = in.readUnsignedByte(); if (debugLevel > 0) { System.out.println(" Read heap sub-record type " + type + " at position " + toHex(posAtEnd - bytesLeft)); } bytesLeft--; switch(type) { case HPROF_GC_ROOT_UNKNOWN: { long id = readID(); bytesLeft -= identifierSize; snapshot.addRoot(new Root(id, 0, Root.UNKNOWN, "")); break; } case HPROF_GC_ROOT_THREAD_OBJ: { long id = readID(); int threadSeq = in.readInt(); int stackSeq = in.readInt(); bytesLeft -= identifierSize + 8; threadObjects.put(new Integer(threadSeq), new ThreadObject(id, stackSeq)); break; } case HPROF_GC_ROOT_JNI_GLOBAL: { long id = readID(); long globalRefId = readID(); // Ignored, for now bytesLeft -= 2*identifierSize; snapshot.addRoot(new Root(id, 0, Root.NATIVE_STATIC, "")); break; } case HPROF_GC_ROOT_JNI_LOCAL: { long id = readID(); int threadSeq = in.readInt(); int depth = in.readInt(); bytesLeft -= identifierSize + 8; ThreadObject to = getThreadObjectFromSequence(threadSeq); StackTrace st = getStackTraceFromSerial(to.stackSeq); if (st != null) { st = st.traceForDepth(depth+1); } snapshot.addRoot(new Root(id, to.threadId, Root.NATIVE_LOCAL, "", st)); break; } case HPROF_GC_ROOT_JAVA_FRAME: { long id = readID(); int threadSeq = in.readInt(); int depth = in.readInt(); bytesLeft -= identifierSize + 8; ThreadObject to = getThreadObjectFromSequence(threadSeq); StackTrace st = getStackTraceFromSerial(to.stackSeq); if (st != null) { st = st.traceForDepth(depth+1); } snapshot.addRoot(new Root(id, to.threadId, Root.JAVA_LOCAL, "", st)); break; } case HPROF_GC_ROOT_NATIVE_STACK: { long id = readID(); int threadSeq = in.readInt(); bytesLeft -= identifierSize + 4; ThreadObject to = getThreadObjectFromSequence(threadSeq); StackTrace st = getStackTraceFromSerial(to.stackSeq); snapshot.addRoot(new Root(id, to.threadId, Root.NATIVE_STACK, "", st)); break; } case HPROF_GC_ROOT_STICKY_CLASS: { long id = readID(); bytesLeft -= identifierSize; snapshot.addRoot(new Root(id, 0, Root.SYSTEM_CLASS, "")); break; } case HPROF_GC_ROOT_THREAD_BLOCK: { long id = readID(); int threadSeq = in.readInt(); bytesLeft -= identifierSize + 4; ThreadObject to = getThreadObjectFromSequence(threadSeq); StackTrace st = getStackTraceFromSerial(to.stackSeq); snapshot.addRoot(new Root(id, to.threadId, Root.THREAD_BLOCK, "", st)); break; } case HPROF_GC_ROOT_MONITOR_USED: { long id = readID(); bytesLeft -= identifierSize; snapshot.addRoot(new Root(id, 0, Root.BUSY_MONITOR, "")); break; } case HPROF_GC_CLASS_DUMP: { int bytesRead = readClass(); bytesLeft -= bytesRead; break; } case HPROF_GC_INSTANCE_DUMP: { int bytesRead = readInstance(); bytesLeft -= bytesRead; break; } case HPROF_GC_OBJ_ARRAY_DUMP: { long bytesRead = readArray(false); bytesLeft -= bytesRead; break; } case HPROF_GC_PRIM_ARRAY_DUMP: { long bytesRead = readArray(true); bytesLeft -= bytesRead; break; } default: { throw new IOException("Unrecognized heap dump sub-record type: " + type); } } } if (bytesLeft != 0) { warn("Error reading heap dump or heap dump segment: Byte count is " + bytesLeft + " instead of 0"); skipBytes(bytesLeft); } if (debugLevel > 0) { System.out.println(" Finished heap sub-records."); } } private long readID() throws IOException { return (identifierSize == 4)? (Snapshot.SMALL_ID_MASK & (long)in.readInt()) : in.readLong(); } // // Read a java value. If result is non-null, it's expected to be an // array of one element. We use it to fake multiple return values. // @returns the number of bytes read // private int readValue(JavaThing[] resultArr) throws IOException { byte type = in.readByte(); return 1 + readValueForType(type, resultArr); } private int readValueForType(byte type, JavaThing[] resultArr) throws IOException { if (version >= VERSION_JDK12BETA4) { type = signatureFromTypeId(type); } return readValueForTypeSignature(type, resultArr); } private int readValueForTypeSignature(byte type, JavaThing[] resultArr) throws IOException { switch (type) { case '[': case 'L': { long id = readID(); if (resultArr != null) { resultArr[0] = new JavaObjectRef(id); } return identifierSize; } case 'Z': { int b = in.readByte(); if (b != 0 && b != 1) { warn("Illegal boolean value read"); } if (resultArr != null) { resultArr[0] = new JavaBoolean(b != 0); } return 1; } case 'B': { byte b = in.readByte(); if (resultArr != null) { resultArr[0] = new JavaByte(b); } return 1; } case 'S': { short s = in.readShort(); if (resultArr != null) { resultArr[0] = new JavaShort(s); } return 2; } case 'C': { char ch = in.readChar(); if (resultArr != null) { resultArr[0] = new JavaChar(ch); } return 2; } case 'I': { int val = in.readInt(); if (resultArr != null) { resultArr[0] = new JavaInt(val); } return 4; } case 'J': { long val = in.readLong(); if (resultArr != null) { resultArr[0] = new JavaLong(val); } return 8; } case 'F': { float val = in.readFloat(); if (resultArr != null) { resultArr[0] = new JavaFloat(val); } return 4; } case 'D': { double val = in.readDouble(); if (resultArr != null) { resultArr[0] = new JavaDouble(val); } return 8; } default: { throw new IOException("Bad value signature: " + type); } } } private ThreadObject getThreadObjectFromSequence(int threadSeq) throws IOException { ThreadObject to = threadObjects.get(new Integer(threadSeq)); if (to == null) { throw new IOException("Thread " + threadSeq + " not found for JNI local ref"); } return to; } private String getNameFromID(long id) throws IOException { return getNameFromID(new Long(id)); } private String getNameFromID(Long id) throws IOException { if (id.longValue() == 0L) { return ""; } String result = names.get(id); if (result == null) { warn("Name not found at " + toHex(id.longValue())); return "unresolved name " + toHex(id.longValue()); } return result; } private StackTrace getStackTraceFromSerial(int ser) throws IOException { if (stackTraces == null) { return null; } StackTrace result = stackTraces.get(new Integer(ser)); if (result == null) { warn("Stack trace not found for serial # " + ser); } return result; } // // Handle a HPROF_GC_CLASS_DUMP // Return number of bytes read // private int readClass() throws IOException { long id = readID(); StackTrace stackTrace = getStackTraceFromSerial(in.readInt()); long superId = readID(); long classLoaderId = readID(); long signersId = readID(); long protDomainId = readID(); long reserved1 = readID(); long reserved2 = readID(); int instanceSize = in.readInt(); int bytesRead = 7 * identifierSize + 8; int numConstPoolEntries = in.readUnsignedShort(); bytesRead += 2; for (int i = 0; i < numConstPoolEntries; i++) { int index = in.readUnsignedShort(); // unused bytesRead += 2; bytesRead += readValue(null); // We ignore the values } int numStatics = in.readUnsignedShort(); bytesRead += 2; JavaThing[] valueBin = new JavaThing[1]; JavaStatic[] statics = new JavaStatic[numStatics]; for (int i = 0; i < numStatics; i++) { long nameId = readID(); bytesRead += identifierSize; byte type = in.readByte(); bytesRead++; bytesRead += readValueForType(type, valueBin); String fieldName = getNameFromID(nameId); if (version >= VERSION_JDK12BETA4) { type = signatureFromTypeId(type); } String signature = "" + ((char) type); JavaField f = new JavaField(fieldName, signature); statics[i] = new JavaStatic(f, valueBin[0]); } int numFields = in.readUnsignedShort(); bytesRead += 2; JavaField[] fields = new JavaField[numFields]; for (int i = 0; i < numFields; i++) { long nameId = readID(); bytesRead += identifierSize; byte type = in.readByte(); bytesRead++; String fieldName = getNameFromID(nameId); if (version >= VERSION_JDK12BETA4) { type = signatureFromTypeId(type); } String signature = "" + ((char) type); fields[i] = new JavaField(fieldName, signature); } String name = classNameFromObjectID.get(new Long(id)); if (name == null) { warn("Class name not found for " + toHex(id)); name = "unknown-name@" + toHex(id); } JavaClass c = new JavaClass(id, name, superId, classLoaderId, signersId, protDomainId, fields, statics, instanceSize); snapshot.addClass(id, c); snapshot.setSiteTrace(c, stackTrace); return bytesRead; } private String toHex(long addr) { return com.sun.tools.hat.internal.util.Misc.toHex(addr); } // // Handle a HPROF_GC_INSTANCE_DUMP // Return number of bytes read // private int readInstance() throws IOException { long start = in.position(); long id = readID(); StackTrace stackTrace = getStackTraceFromSerial(in.readInt()); long classID = readID(); int bytesFollowing = in.readInt(); int bytesRead = (2 * identifierSize) + 8 + bytesFollowing; JavaObject jobj = new JavaObject(classID, start); skipBytes(bytesFollowing); snapshot.addHeapObject(id, jobj); snapshot.setSiteTrace(jobj, stackTrace); return bytesRead; } // // Handle a HPROF_GC_OBJ_ARRAY_DUMP or HPROF_GC_PRIM_ARRAY_DUMP // Return number of bytes read // private long readArray(boolean isPrimitive) throws IOException { long start = in.position(); long id = readID(); StackTrace stackTrace = getStackTraceFromSerial(in.readInt()); int num = in.readInt(); long bytesRead = identifierSize + 8; long elementClassID; if (isPrimitive) { elementClassID = in.readByte(); bytesRead++; } else { elementClassID = readID(); bytesRead += identifierSize; } // Check for primitive arrays: byte primitiveSignature = 0x00; int elSize = 0; if (isPrimitive || version < VERSION_JDK12BETA4) { switch ((int)elementClassID) { case T_BOOLEAN: { primitiveSignature = (byte) 'Z'; elSize = 1; break; } case T_CHAR: { primitiveSignature = (byte) 'C'; elSize = 2; break; } case T_FLOAT: { primitiveSignature = (byte) 'F'; elSize = 4; break; } case T_DOUBLE: { primitiveSignature = (byte) 'D'; elSize = 8; break; } case T_BYTE: { primitiveSignature = (byte) 'B'; elSize = 1; break; } case T_SHORT: { primitiveSignature = (byte) 'S'; elSize = 2; break; } case T_INT: { primitiveSignature = (byte) 'I'; elSize = 4; break; } case T_LONG: { primitiveSignature = (byte) 'J'; elSize = 8; break; } } if (version >= VERSION_JDK12BETA4 && primitiveSignature == 0x00) { throw new IOException("Unrecognized typecode: " + elementClassID); } } if (primitiveSignature != 0x00) { long size = elSize * (long)num; bytesRead += size; JavaValueArray va = new JavaValueArray(primitiveSignature, start); skipBytes(size); snapshot.addHeapObject(id, va); snapshot.setSiteTrace(va, stackTrace); } else { long sz = (long)num * identifierSize; bytesRead += sz; JavaObjectArray arr = new JavaObjectArray(elementClassID, start); skipBytes(sz); snapshot.addHeapObject(id, arr); snapshot.setSiteTrace(arr, stackTrace); } return bytesRead; } private byte signatureFromTypeId(byte typeId) throws IOException { switch (typeId) { case T_CLASS: { return (byte) 'L'; } case T_BOOLEAN: { return (byte) 'Z'; } case T_CHAR: { return (byte) 'C'; } case T_FLOAT: { return (byte) 'F'; } case T_DOUBLE: { return (byte) 'D'; } case T_BYTE: { return (byte) 'B'; } case T_SHORT: { return (byte) 'S'; } case T_INT: { return (byte) 'I'; } case T_LONG: { return (byte) 'J'; } default: { throw new IOException("Invalid type id of " + typeId); } } } private void handleEOF(EOFException exp, Snapshot snapshot) { if (debugLevel > 0) { exp.printStackTrace(); } warn("Unexpected EOF. Will miss information..."); // we have EOF, we have to tolerate missing references snapshot.setUnresolvedObjectsOK(true); } private void warn(String msg) { System.out.println("WARNING: " + msg); } // // A trivial data-holder class for HPROF_GC_ROOT_THREAD_OBJ. // private class ThreadObject { long threadId; int stackSeq; ThreadObject(long threadId, int stackSeq) { this.threadId = threadId; this.stackSeq = stackSeq; } } }