Examples with JavaObject com.ibm.dtfj.java.JavaObject used on opensource projects

Example 16 with JavaObject

use of com.ibm.dtfj.java.JavaObject in project openj9 by eclipse.

the class PHDJavaHeap method getLastObject.

/**
 * Attempt to get the last object without rereading the entire heap.
 * @param address
 * @param classAddress
 * @param length
 * @return a JavaObject with sufficient information to determine its length
 * @throws IOException
 */
JavaObject getLastObject(ImagePointer address, long classAddress, int length) throws IOException {
    JavaObject jo = getCachedObjectAtAddress(address, false);
    if (jo != null)
        return jo;
    long addr = address.getAddress();
    if (classAddress < 8) {
        JavaClass jc = runtime.findArrayOfType((int) classAddress);
        jo = new PHDJavaObject.Builder(this, addr, jc, PHDJavaObject.NO_HASHCODE, -1).length(length).refsAsArray(NOREFS, 0).build();
    } else if (length >= 0) {
        if (isJ9V4)
            length--;
        JavaClass jc = runtime.findArrayOfClass(classAddress);
        jo = new PHDJavaObject.Builder(this, addr, jc, PHDJavaObject.NO_HASHCODE, -1).length(length).build();
    } else {
        JavaClass jc = runtime.findClass(classAddress);
        jo = new PHDJavaObject.Builder(this, addr, jc, PHDJavaObject.NO_HASHCODE, -1).length(PHDJavaObject.SIMPLE_OBJECT).build();
    }
    return jo;
}

Example 17 with JavaObject

use of com.ibm.dtfj.java.JavaObject in project openj9 by eclipse.

the class InfoThreadCommand method printJavaThreadInfo.

private void printJavaThreadInfo(JavaThread jt, boolean idPrinted) {
    out.print("    name:          ");
    try {
        out.print(jt.getName());
    } catch (CorruptDataException e) {
        out.print(Exceptions.getCorruptDataExceptionString());
        logger.log(Level.FINEST, Exceptions.getCorruptDataExceptionString(), e);
    }
    out.print("\n");
    if (!idPrinted) {
        try {
            if (jt.getImageThread() != null) {
                out.print("    id:            ");
                out.print(jt.getImageThread().getID());
            }
        } catch (CorruptDataException e) {
            out.print(Exceptions.getCorruptDataExceptionString());
            logger.log(Level.FINEST, Exceptions.getCorruptDataExceptionString(), e);
        } catch (DataUnavailable e) {
            out.print(Exceptions.getDataUnavailableString());
            logger.log(Level.FINEST, Exceptions.getDataUnavailableString(), e);
        } finally {
            out.print("\n");
        }
    }
    out.print("    Thread object: ");
    try {
        JavaObject threadObj = jt.getObject();
        if (null == threadObj) {
            out.print("<no associated Thread object>");
        } else {
            String threadClassName = null;
            try {
                JavaClass threadClass = threadObj.getJavaClass();
                threadClassName = threadClass.getName();
                if (threadClassName != null) {
                    out.print(threadClassName + " @ ");
                }
                out.print(Utils.toHex(threadObj.getID().getAddress()));
                // Navigate to the parent java/lang.Thread class to get the 'tid' and 'isDaemon' fields
                while (!JAVA_LANG_THREAD_CLASS.equals(threadClass.getName()) && threadClass != null) {
                    threadClass = threadClass.getSuperclass();
                }
                if (threadClass != null) {
                    Iterator itField = threadClass.getDeclaredFields();
                    boolean foundThreadId = false;
                    while (itField.hasNext()) {
                        JavaField jf = (JavaField) itField.next();
                        /* "uniqueId" field in java.lang.Thread is renamed to "tid". The old field name is
							 * checked to preserve functionality of DDR command with old core files that reference
							 * the "uniqueId" field.
							 */
                        if (!foundThreadId && (jf.getName().equals("uniqueId") || jf.getName().equals("tid"))) {
                            foundThreadId = true;
                            out.print("\n    ID:            " + Utils.getVal(threadObj, jf));
                        } else if (jf.getName().equals("isDaemon")) {
                            out.print("\n    Daemon:        " + Utils.getVal(threadObj, jf));
                        }
                    }
                }
            } catch (CorruptDataException cde) {
                out.print(" <in-flight or corrupt data encountered>");
                logger.log(Level.FINEST, Exceptions.getCorruptDataExceptionString(), cde);
            }
        }
    } catch (CorruptDataException cde) {
        out.print(Exceptions.getCorruptDataExceptionString());
        logger.log(Level.FINEST, Exceptions.getCorruptDataExceptionString(), cde);
    }
    out.print("\n");
    out.print("    Priority:      ");
    try {
        Integer pri = new Integer(jt.getPriority());
        out.print(pri.toString());
    } catch (CorruptDataException e) {
        out.print(Exceptions.getCorruptDataExceptionString());
        logger.log(Level.FINEST, Exceptions.getCorruptDataExceptionString(), e);
    }
    out.print("\n");
    out.print("    Thread.State:  ");
    try {
        out.print(StateToString.getThreadStateString(jt.getState()));
    } catch (CorruptDataException cde) {
        out.print(Exceptions.getCorruptDataExceptionString());
        logger.log(Level.FINEST, Exceptions.getCorruptDataExceptionString(), cde);
    }
    out.print("\n");
    out.print("    JVMTI state:   ");
    try {
        out.print(StateToString.getJVMTIStateString(jt.getState()));
    } catch (CorruptDataException cde) {
        out.print(Exceptions.getCorruptDataExceptionString());
        logger.log(Level.FINEST, Exceptions.getCorruptDataExceptionString(), cde);
    }
    out.print("\n");
    printThreadBlocker(jt);
    out.print("    Java stack frames: ");
    printJavaStackFrameInfo(jt);
    out.print("\n");
}

Example 18 with JavaObject

use of com.ibm.dtfj.java.JavaObject in project openj9 by eclipse.

the class InfoThreadCommand method printThreadBlocker.

private void printThreadBlocker(JavaThread jt) {
    try {
        if ((jt.getState() & JavaThread.STATE_PARKED) != 0) {
            out.print("      parked on: ");
            // java.util.concurrent locks
            if (jt.getBlockingObject() == null) {
                out.print("<unknown>");
            } else {
                JavaObject jo = jt.getBlockingObject();
                String lockID = Long.toHexString(jo.getID().getAddress());
                out.print(jo.getJavaClass().getName() + "@0x" + lockID);
                String ownerThreadName = "<unknown>";
                String ownerThreadID = "<null>";
                out.print(" owner name: ");
                JavaThread lockOwnerThread = Utils.getParkBlockerOwner(jo, ctx.getRuntime());
                if (lockOwnerThread != null) {
                    ownerThreadName = lockOwnerThread.getName();
                    if (lockOwnerThread.getImageThread() != null) {
                        ownerThreadID = lockOwnerThread.getImageThread().getID();
                    }
                } else {
                    // If the owning thread has ended we won't find the JavaThread
                    // We can still get the owning thread name from the java.lang.Thread object itself.
                    // We won't get a thread id.
                    JavaObject lockOwnerObj = Utils.getParkBlockerOwnerObject(jo, ctx.getRuntime());
                    if (lockOwnerObj != null) {
                        ownerThreadName = Utils.getThreadNameFromObject(lockOwnerObj, ctx.getRuntime(), out);
                    }
                }
                out.print("\"" + ownerThreadName + "\"");
                out.print(" owner id: " + ownerThreadID);
            }
            out.print("\n");
        } else if ((jt.getState() & JavaThread.STATE_IN_OBJECT_WAIT) != 0) {
            out.print("      waiting to be notified on: ");
        } else if ((jt.getState() & JavaThread.STATE_BLOCKED_ON_MONITOR_ENTER) != 0) {
            out.print("      waiting to enter: ");
        }
        if ((jt.getState() & JavaThread.STATE_IN_OBJECT_WAIT) != 0 || (jt.getState() & JavaThread.STATE_BLOCKED_ON_MONITOR_ENTER) != 0) {
            // java monitors
            MonitorState ms = (MonitorState) monitors.get(jt);
            if (ms == null) {
                out.println("<monitor information not available>");
            } else {
                JavaObject jo = ms.getMonitor().getObject();
                if (null == jo) {
                    // working with a raw monitor
                    String name = ms.getMonitor().getName();
                    if (name.equals("")) {
                        name = "<unnamed>";
                    }
                    out.print("\"" + name + "\"");
                    out.print(" with ID ");
                    out.print(Utils.toHex(ms.getMonitor().getID().getAddress()));
                } else {
                    // working with a Java monitor
                    String lockID = Long.toHexString(jo.getID().getAddress());
                    out.print(jo.getJavaClass().getName() + "@0x" + lockID);
                }
                out.print(" owner name: ");
                if (ms.getMonitor().getOwner() != null) {
                    out.print("\"" + ms.getMonitor().getOwner().getName() + "\"");
                    if (ms.getMonitor().getOwner().getImageThread() != null) {
                        out.print(" owner id: " + ms.getMonitor().getOwner().getImageThread().getID());
                    }
                } else {
                    out.print("<unowned>");
                }
                out.print("\n");
            }
        }
    } catch (CorruptDataException cde) {
        out.print(Exceptions.getCorruptDataExceptionString());
        logger.log(Level.FINEST, Exceptions.getCorruptDataExceptionString(), cde);
    } catch (DataUnavailable e) {
        out.print(Exceptions.getDataUnavailableString());
        logger.log(Level.FINEST, Exceptions.getDataUnavailableString(), e);
    } catch (MemoryAccessException e) {
        out.print(Exceptions.getMemoryAccessExceptionString());
        logger.log(Level.FINEST, Exceptions.getMemoryAccessExceptionString(), e);
    }
}

Example 19 with JavaObject

use of com.ibm.dtfj.java.JavaObject in project openj9 by eclipse.

the class Utils method getParkBlockerOwner.

/* Find the JavaThread that owns a blocking object by finding the java/lang/Thread
	 * JavaObject of the owner and then looking through the list of JavaThreads to
	 * see who that belongs to. 
	 */
public static JavaThread getParkBlockerOwner(JavaObject blocker, JavaRuntime r) throws CorruptDataException, MemoryAccessException {
    JavaObject ownerObj = getParkBlockerOwnerObject(blocker, r);
    if (ownerObj == null) {
        return null;
    }
    Iterator threads = r.getThreads();
    while (threads.hasNext()) {
        Object lObj = threads.next();
        if (lObj instanceof JavaThread) {
            JavaThread thread = (JavaThread) lObj;
            if (ownerObj.equals(thread.getObject())) {
                return thread;
            }
        }
    }
    return null;
}

Example 20 with JavaObject

use of com.ibm.dtfj.java.JavaObject in project openj9 by eclipse.

the class Utils method getStringVal.

private static String getStringVal(JavaObject jo) {
    JavaClass jc;
    try {
        jc = jo.getJavaClass();
    } catch (CorruptDataException e) {
        return "<cannot get String class from String object (" + Exceptions.getCorruptDataExceptionString() + ")>";
    }
    Iterator itJavaField = jc.getDeclaredFields();
    JavaField jf = null;
    while (itJavaField.hasNext()) {
        jf = (JavaField) itJavaField.next();
        try {
            if (jf.getSignature().equals("[C") && !Modifier.isStatic(jf.getModifiers()))
                break;
        } catch (CorruptDataException e) {
        // if we have an exception, do nothing and go onto the next field
        }
    }
    if (jf == null) {
        // empty field iterator (occurs e.g. when reading PHD heapdumps), can't get the char array
        return "<cannot get char array out of String>";
    }
    JavaObject charArray = null;
    try {
        charArray = (JavaObject) jf.get(jo);
    } catch (CorruptDataException e) {
        return "<cannot get char array out of String (" + Exceptions.getCorruptDataExceptionString() + ")>";
    } catch (MemoryAccessException e) {
        return "<cannot get char array out of String (" + Exceptions.getMemoryAccessExceptionString() + ")>";
    }
    int arraySize;
    try {
        arraySize = charArray.getArraySize();
    } catch (CorruptDataException e) {
        return "<cannot determine the size of the array (" + Exceptions.getCorruptDataExceptionString() + ")>";
    }
    char[] dst = new char[arraySize];
    try {
        charArray.arraycopy(0, dst, 0, arraySize);
    } catch (CorruptDataException e) {
        return "<cannot copy data from the array (" + Exceptions.getCorruptDataExceptionString() + ")>";
    } catch (MemoryAccessException e) {
        return "<cannot copy data from the array (" + Exceptions.getMemoryAccessExceptionString() + ")>";
    }
    return "\"" + Utils.getPrintable(new String(dst)) + "\"";
}