Examples with MemoryAccessException com.ibm.dtfj.image.MemoryAccessException used on opensource projects

Example 6 with MemoryAccessException

use of com.ibm.dtfj.image.MemoryAccessException in project openj9 by eclipse.

the class InfoLockCommand method showJavaUtilConcurrentLocks.

private void showJavaUtilConcurrentLocks() {
    // A map of lock objects and their waiting threads.
    Map locksToThreads = new HashMap();
    JavaRuntime jr = ctx.getRuntime();
    Iterator itThread = jr.getThreads();
    while (itThread.hasNext()) {
        try {
            Object o = itThread.next();
            if (!(o instanceof JavaThread)) {
                continue;
            }
            JavaThread jt = (JavaThread) o;
            if ((jt.getState() & JavaThread.STATE_PARKED) != 0) {
                JavaObject lock = jt.getBlockingObject();
                if (lock != null) {
                    List parkedList = (List) locksToThreads.get(lock);
                    if (parkedList == null) {
                        parkedList = new LinkedList();
                        locksToThreads.put(lock, parkedList);
                    }
                    parkedList.add(jt);
                }
            }
        } catch (CorruptDataException cde) {
            out.println("\nwarning, corrupt data encountered during scan for java.util.concurrent locks...");
            logger.log(Level.FINE, Exceptions.getCorruptDataExceptionString(), cde);
        } catch (DataUnavailable du) {
            out.println("\nwarning, data unavailable encountered during scan for java.util.concurrent locks...");
            logger.log(Level.FINE, Exceptions.getDataUnavailableString(), du);
        }
    }
    out.println("\njava.util.concurrent locks in use...");
    if (locksToThreads.size() == 0) {
        out.println("\t...None.");
        out.println();
    }
    for (Object e : locksToThreads.entrySet()) {
        try {
            Map.Entry entry = (Map.Entry) e;
            JavaObject lock = (JavaObject) entry.getKey();
            List threads = (List) entry.getValue();
            String threadName = "<unowned>";
            JavaThread lockOwnerThread = Utils.getParkBlockerOwner(lock, ctx.getRuntime());
            if (lockOwnerThread != null) {
                threadName = lockOwnerThread.getName();
            } 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.
                JavaObject lockOwnerObj = Utils.getParkBlockerOwnerObject(lock, ctx.getRuntime());
                if (lockOwnerObj != null) {
                    threadName = Utils.getThreadNameFromObject(lockOwnerObj, ctx.getRuntime(), out);
                } else {
                    threadName = "<unknown>";
                }
            }
            if (threads != null && threads.size() > 0) {
                String lockID = Long.toHexString(lock.getID().getAddress());
                ImageThread imageThread = (lockOwnerThread != null ? lockOwnerThread.getImageThread() : null);
                out.println(lock.getJavaClass().getName() + "@0x" + lockID + "\n\tlocked by java thread id: " + ((imageThread != null) ? imageThread.getID() : "<null>") + " name: " + (threadName));
                for (Object t : threads) {
                    JavaThread waiter = (JavaThread) t;
                    out.println("\twaiting thread id: " + waiter.getImageThread().getID() + " name: " + waiter.getName());
                }
            }
        } catch (CorruptDataException cde) {
            out.println("\nwarning, corrupt data encountered during scan for java.util.concurrent locks...");
            logger.log(Level.FINE, Exceptions.getCorruptDataExceptionString(), cde);
        } catch (MemoryAccessException ma) {
            out.println("\nwarning, memory access error encountered during scan for java.util.concurrent locks...");
            logger.log(Level.FINE, Exceptions.getMemoryAccessExceptionString(), ma);
        } catch (DataUnavailable du) {
            out.println("\nwarning, data unavailable encountered during scan for java.util.concurrent locks...");
            logger.log(Level.FINE, Exceptions.getDataUnavailableString(), du);
        }
    }
}

Example 7 with MemoryAccessException

use of com.ibm.dtfj.image.MemoryAccessException in project openj9 by eclipse.

the class JavaThread method getPriority.

/* (non-Javadoc)
	 * @see com.ibm.dtfj.java.JavaThread#getPriority()
	 */
public int getPriority() throws CorruptDataException {
    JavaObject theObject = getObject();
    if (null != theObject) {
        JavaClass threadClass = _javaLangThreadSuperclass();
        Iterator fields = threadClass.getDeclaredFields();
        while (fields.hasNext()) {
            JavaField oneField = (JavaField) fields.next();
            if (oneField.getName().equals("priority")) {
                try {
                    return oneField.getInt(theObject);
                } catch (MemoryAccessException e) {
                    throw new CorruptDataException(new CorruptData("unable to read memory for 'priority' field", null));
                }
            }
        }
        throw new CorruptDataException(new CorruptData("unable to find 'priority' field", null));
    } else {
        // TODO:  have a good exception for this sort of thing
        return -1;
    }
}

Example 8 with MemoryAccessException

use of com.ibm.dtfj.image.MemoryAccessException in project openj9 by eclipse.

the class Utils method getVal.

// note: this method lets you pass in a null JavaObject, but it _will_ throw a
// NullPointerException if the JavaField is not a static field when you pass it
// a null JavaObject; this is the behavior of jf.get() and jf.getString()
public static String getVal(JavaObject jo, JavaField jf) {
    Object o;
    String s;
    if (null == jf) {
        o = jo;
        s = null;
    } else {
        try {
            o = jf.get(jo);
        } catch (CorruptDataException e) {
            return "<corrupt data>";
        } catch (MemoryAccessException d) {
            return "<invalid memory address>";
        } catch (NumberFormatException nfe) {
            return "<invalid number>";
        }
        try {
            s = jf.getString(jo);
        } catch (CorruptDataException e) {
            s = null;
        } catch (MemoryAccessException e) {
            s = null;
        } catch (IllegalArgumentException e) {
            s = null;
        }
    }
    return getVal(o, s, jf);
}

Example 9 with MemoryAccessException

use of com.ibm.dtfj.image.MemoryAccessException in project openj9 by eclipse.

the class HexdumpCommand method doCommand.

public void doCommand(String[] args) {
    StringBuffer stringBuffer = new StringBuffer();
    ImageAddressSpace imageAddressSpace = ctx.getAddressSpace();
    if (null == imageAddressSpace) {
        out.println("Could not find an address space which contains a process in this core file");
        return;
    }
    long addressInDecimal = 0;
    // dump 256 bytes by default
    int numBytesToPrint = 16 * 16;
    int asciiIndex = 0;
    if (args.length != 0) {
        Long address = Utils.longFromString(args[0]);
        if (null == address) {
            out.println("Specified address is invalid");
            return;
        }
        addressInDecimal = address.longValue();
    } else {
        out.println("\"hexdump\" requires at least an address parameter");
        return;
    }
    if (args.length > 1) {
        try {
            numBytesToPrint = Integer.parseInt(args[1]);
        } catch (NumberFormatException nfe) {
            out.println("Specified length is invalid");
            return;
        }
    }
    ImagePointer imagePointerBase = imageAddressSpace.getPointer(addressInDecimal);
    boolean is_zOSdump = false;
    try {
        is_zOSdump = ctx.getImage().getSystemType().toLowerCase().indexOf("z/os") >= 0;
    } catch (DataUnavailable e1) {
    // unable to get the dump OS type, continue without the additional zOS EBCDIC option
    } catch (CorruptDataException e1) {
    // unable to get the dump OS type, continue without the additional zOS EBCDIC option
    }
    String asciiChars = "";
    String ebcdicChars = "";
    long i;
    for (i = 0; i < numBytesToPrint; i++) {
        ImagePointer imagePointer = imagePointerBase.add(i);
        // stringBuffer.append(Long.toHexString(imagePointer.getAddress())+":\t");
        try {
            Byte byteValue = new Byte(imagePointer.getByteAt(0));
            asciiIndex = (int) byteValue.byteValue();
            if (asciiIndex < 0) {
                asciiIndex += 256;
            }
            String rawHexString = Integer.toHexString(byteValue.intValue());
            String fixedHexString = fixHexStringLength(rawHexString);
            String hexText = fixedHexString;
            if (0 == i % 4) {
                hexText = " " + hexText;
            }
            if (0 == i % 16) {
                hexText = "\n" + Long.toHexString(imagePointer.getAddress()) + ":" + hexText;
                asciiChars = "  |";
                ebcdicChars = " |";
            }
            stringBuffer.append(hexText);
            asciiChars += Utils.byteToAscii.substring(asciiIndex, asciiIndex + 1);
            if (15 == i % 16 && i != 0) {
                asciiChars += "|";
                stringBuffer.append(asciiChars);
            }
            if (is_zOSdump) {
                // for zOS dumps, output additional EBCDIC interpretation of the memory byes
                ebcdicChars += Utils.byteToEbcdic.substring(asciiIndex, asciiIndex + 1);
                if (15 == i % 16 && i != 0) {
                    ebcdicChars += "|";
                    stringBuffer.append(ebcdicChars);
                }
            }
        } catch (MemoryAccessException e) {
            out.println("Address not in memory - 0x" + Long.toHexString(imagePointer.getAddress()));
            return;
        } catch (CorruptDataException e) {
            out.println("Dump data is corrupted");
            return;
        }
    }
    long undisplayedBytes = 16 - i % 16;
    if (16 != undisplayedBytes) {
        stringBuffer.append(padSpace(undisplayedBytes, asciiChars));
        if (is_zOSdump) {
            // Add padding and output the remaining EBCDIC characters
            for (int j = 0; j < undisplayedBytes; j++) {
                ebcdicChars = " " + ebcdicChars;
            }
            stringBuffer.append(" " + ebcdicChars);
        }
    }
    stringBuffer.append("\n");
    out.println(new String(stringBuffer));
    /*properties.put(Utils.CURRENT_MEM_ADDRESS, 
				Long.toHexString(addressInDecimal+numBytesToPrint));*/
    ctx.getProperties().put(Utils.CURRENT_MEM_ADDRESS, new Long(addressInDecimal));
    ctx.getProperties().put(Utils.CURRENT_NUM_BYTES_TO_PRINT, new Integer(numBytesToPrint));
}

Example 10 with MemoryAccessException

use of com.ibm.dtfj.image.MemoryAccessException in project openj9 by eclipse.

the class NodeList method toString.

// Print this list of monitor nodes (ie the owning threads and there object addresses)
public String toString() {
    String retval = "";
    MonitorNode currNode = tail;
    MonitorNode lastNode = null;
    boolean firstTime = true;
    boolean done = false;
    do {
        String name = "";
        String objAddr = "";
        JavaObject object = null;
        JavaThread owner = null;
        try {
            owner = currNode.getOwner();
            name = owner.getName();
            ImageThread nativeThread = owner.getImageThread();
            if (nativeThread != null) {
                name = name + " id: " + nativeThread.getID();
            }
        } catch (CorruptDataException e) {
            name = Exceptions.getCorruptDataExceptionString();
        } catch (DataUnavailable e) {
            name = Exceptions.getDataUnavailableString();
        } catch (MemoryAccessException e) {
            name = Exceptions.getMemoryAccessExceptionString();
        }
        object = currNode.getObject();
        if (null == object) {
            objAddr = " at : " + Utils.toHex(currNode.getMonitorAddress());
        } else {
            objAddr = " object : " + Utils.toHex(object.getID().getAddress());
        }
        String lockName = currNode.getType();
        retval += "thread: " + name + " (owns " + lockName + objAddr + ") waiting for =>\n\t  ";
        lastNode = currNode;
        currNode = currNode.waitingOn;
        if (head == lastNode) {
            if (firstTime && head == tail)
                done = false;
            else
                done = true;
        }
        firstTime = false;
    } while (!done);
    // removes the tail of the last entry
    retval = retval.substring(0, retval.length() - 18);
    return retval;
}