Examples with J9ObjectPointer com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer used on opensource projects

Example 26 with J9ObjectPointer

use of com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer in project openj9 by eclipse.

the class MonitorsCommand method objectCommand.

/**
 * See {@link MonitorsCommand#helpCommand(String[], PrintStream)} for
 * function documentation
 *
 * @param args
 *            command args
 * @param out
 *            the output stream
 */
private void objectCommand(String[] args, PrintStream out) throws DDRInteractiveCommandException {
    FilterOptions filter = FilterOptions.defaultOption();
    try {
        J9ObjectPointer object = null;
        if (args.length < 2) {
            out.println("This command takes one address \"!monitors object <J9Object address>\"");
            return;
        }
        long objectAddr = Long.decode(args[1]);
        object = J9ObjectPointer.cast(objectAddr);
        ObjectMonitor objMonitor = ObjectMonitor.fromJ9Object(object);
        if (null == objMonitor) {
            out.printf("No corresponding monitor was found for %s\n", object.getHexAddress());
        } else {
            writeObjectMonitor(filter, objMonitor, out);
        }
    } catch (CorruptDataException e) {
        throw new DDRInteractiveCommandException(e);
    }
}

Example 27 with J9ObjectPointer

use of com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer in project openj9 by eclipse.

the class MonitorsCommand method threadCommand.

/**
 * Dumps all monitors that are active for the specified J9Thread/J9VMThread/java.lang.Thread
 * @param args
 * @param out
 * @throws DDRInteractiveCommandException
 */
private void threadCommand(String[] args, PrintStream out) throws DDRInteractiveCommandException {
    if (args.length < 2) {
        out.println("This command takes one address argument: \"!monitors thread <address>\"");
        return;
    }
    try {
        long address = CommandUtils.parsePointer(args[1], J9BuildFlags.env_data64);
        VoidPointer ptr = VoidPointer.cast(address);
        J9JavaVMPointer vm = J9RASHelper.getVM(DataType.getJ9RASPointer());
        J9VMThreadPointer mainThread = vm.mainThread();
        J9ThreadLibraryPointer lib = mainThread.osThread().library();
        J9PoolPointer pool = lib.thread_pool();
        Pool<J9ThreadPointer> threadPool = Pool.fromJ9Pool(pool, J9ThreadPointer.class);
        SlotIterator<J9ThreadPointer> poolIterator = threadPool.iterator();
        J9ThreadPointer osThreadPtr = null;
        while (poolIterator.hasNext()) {
            osThreadPtr = poolIterator.next();
            // Is there an associated J9VMThread?
            J9VMThreadPointer vmThread = J9ThreadHelper.getVMThread(osThreadPtr);
            J9ObjectPointer jlThread = null;
            if (vmThread.notNull()) {
                jlThread = vmThread.threadObject();
                if ((null != jlThread) && jlThread.equals(ptr)) {
                    out.println("Found java/lang/Thread @ " + ptr.getHexAddress());
                    printMonitorsForJ9VMThread(out, vm, vmThread);
                    return;
                } else if (vmThread.equals(ptr)) {
                    out.println("Found j9vmthread @ " + ptr.getHexAddress());
                    printMonitorsForJ9VMThread(out, vm, vmThread);
                    return;
                }
            }
            if (osThreadPtr.equals(ptr)) {
                out.println("Found j9thread @ " + ptr.getHexAddress());
                if (vmThread.notNull()) {
                    printMonitorsForJ9VMThread(out, vm, vmThread);
                }
                printMonitorsForJ9Thread(out, vm, osThreadPtr);
                return;
            }
        }
    } catch (CorruptDataException e) {
        throw new DDRInteractiveCommandException(e);
    }
}

Example 28 with J9ObjectPointer

use of com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer in project openj9 by eclipse.

the class CheckEngine method checkJ9ObjectPointer.

private int checkJ9ObjectPointer(J9ObjectPointer object, J9ObjectPointer[] newObject, GCHeapRegionDescriptor[] regionDesc) throws CorruptDataException {
    newObject[0] = object;
    if (object.isNull()) {
        return J9MODRON_GCCHK_RC_OK;
    }
    regionDesc[0] = findRegionForPointer(object, regionDesc[0]);
    if (regionDesc[0] == null) {
        /* Is the object on the stack? */
        GCVMThreadListIterator threadListIterator = GCVMThreadListIterator.from();
        while (threadListIterator.hasNext()) {
            J9VMThreadPointer vmThread = threadListIterator.next();
            if (isObjectOnStack(object, vmThread.stackObject())) {
                return J9MODRON_GCCHK_RC_STACK_OBJECT;
            }
        }
        UDATA classSlot = UDATA.cast(object.clazz());
        if (classSlot.eq(J9MODRON_GCCHK_J9CLASS_EYECATCHER)) {
            return J9MODRON_GCCHK_RC_OBJECT_SLOT_POINTS_TO_J9CLASS;
        }
        return J9MODRON_GCCHK_RC_NOT_FOUND;
    }
    // if (0 == regionDesc->objectAlignment) {
    if (!regionDesc[0].containsObjects()) {
        /* this is a heap region, but it's not intended for objects (could be free or an arraylet leaf) */
        return J9MODRON_GCCHK_RC_NOT_IN_OBJECT_REGION;
    }
    /* Now we know object is not on stack we can check that it's correctly aligned
		 * for a J9Object.
		 */
    if (object.anyBitsIn(J9MODRON_GCCHK_J9OBJECT_ALIGNMENT_MASK)) {
        return J9MODRON_GCCHK_RC_UNALIGNED;
    }
    if (isMidscavengeFlagSet()) {
        if (GCExtensions.isVLHGC() || (regionDesc[0].getTypeFlags().allBitsIn(MEMORY_TYPE_NEW))) {
            // TODO: ideally, we should only check this in the evacuate segment
            // TODO: do some safety checks first -- is there enough room in the segment?
            GCScavengerForwardedHeader scavengerForwardedHeader = GCScavengerForwardedHeader.fromJ9Object(object);
            if (scavengerForwardedHeader.isForwardedPointer()) {
                newObject[0] = scavengerForwardedHeader.getForwardedObject();
                reportForwardedObject(object, newObject[0]);
                // Replace the object and resume
                object = newObject[0];
                regionDesc[0] = findRegionForPointer(object, regionDesc[0]);
                if (regionDesc[0] == null) {
                    /* Is the object on the stack? */
                    GCVMThreadListIterator threadListIterator = GCVMThreadListIterator.from();
                    while (threadListIterator.hasNext()) {
                        J9VMThreadPointer vmThread = threadListIterator.next();
                        if (isObjectOnStack(object, vmThread.stackObject())) {
                            return J9MODRON_GCCHK_RC_STACK_OBJECT;
                        }
                    }
                    return J9MODRON_GCCHK_RC_NOT_FOUND;
                }
                // if (0 == regionDesc->objectAlignment) {
                if (!regionDesc[0].containsObjects()) {
                    /* this is a heap region, but it's not intended for objects (could be free or an arraylet leaf) */
                    return J9MODRON_GCCHK_RC_NOT_IN_OBJECT_REGION;
                }
                /* make sure the forwarded pointer is also aligned */
                if (object.anyBitsIn(J9MODRON_GCCHK_J9OBJECT_ALIGNMENT_MASK)) {
                    return J9MODRON_GCCHK_RC_UNALIGNED;
                }
            }
        }
    }
    if (isScavengerBackoutFlagSet()) {
        GCScavengerForwardedHeader scavengerForwardedHeader = GCScavengerForwardedHeader.fromJ9Object(object);
        if (scavengerForwardedHeader.isReverseForwardedPointer()) {
            newObject[0] = scavengerForwardedHeader.getReverseForwardedPointer();
            reportForwardedObject(object, newObject[0]);
            // Replace the object and resume
            object = newObject[0];
            regionDesc[0] = findRegionForPointer(object, regionDesc[0]);
            if (regionDesc[0] == null) {
                return J9MODRON_GCCHK_RC_NOT_FOUND;
            }
            if (!regionDesc[0].containsObjects()) {
                /* this is a heap region, but it's not intended for objects (could be free or an arraylet leaf) */
                return J9MODRON_GCCHK_RC_NOT_IN_OBJECT_REGION;
            }
            if (!regionDesc[0].getTypeFlags().allBitsIn(MEMORY_TYPE_NEW)) {
                /* reversed forwarded should point to Evacuate */
                return J9MODRON_GCCHK_RC_REVERSED_FORWARDED_OUTSIDE_EVACUATE;
            }
            /* make sure the forwarded pointer is also aligned */
            if (object.anyBitsIn(J9MODRON_GCCHK_J9OBJECT_ALIGNMENT_MASK)) {
                return J9MODRON_GCCHK_RC_UNALIGNED;
            }
        }
    }
    /* Check that elements of a double array are aligned on an 8-byte boundary.  For continuous
		 * arrays, verifying that the J9Indexable object is aligned on an 8-byte boundary is sufficient.
		 * For arraylets, depending on the layout, elements of the array may be stored on arraylet leafs
		 * or on the spine.  Arraylet leafs should always be aligned on 8-byte boundaries.  Checking both 
		 * the first and last element will ensure that we are always checking that elements are aligned 
		 * on the spine.
		 *  */
    long classShape = -1;
    try {
        classShape = ObjectModel.getClassShape(J9ObjectHelper.clazz(object)).longValue();
    } catch (CorruptDataException cde) {
    /* don't bother to report an error yet -- a later step will catch this. */
    }
    if (classShape == OBJECT_HEADER_SHAPE_DOUBLES) {
        J9IndexableObjectPointer array = J9IndexableObjectPointer.cast(object);
        int size = 0;
        VoidPointer elementPtr = VoidPointer.NULL;
        try {
            size = ObjectModel.getSizeInElements(object).intValue();
        } catch (InvalidDataTypeException ex) {
        // size in elements can not be larger then 2G but it is...
        // We could report an error at this point, but the C version
        // doesn't -- we'll catch it later
        } catch (IllegalArgumentException ex) {
        // We could report an error at this point, but the C version
        // doesn't -- we'll catch it later
        }
        if (0 != size) {
            elementPtr = ObjectModel.getElementAddress(array, 0, U64.SIZEOF);
            if (elementPtr.anyBitsIn(U64.SIZEOF - 1)) {
                return J9MODRON_GCCHK_RC_DOUBLE_ARRAY_UNALIGNED;
            }
            elementPtr = ObjectModel.getElementAddress(array, size - 1, U64.SIZEOF);
            if (elementPtr.anyBitsIn(U64.SIZEOF - 1)) {
                return J9MODRON_GCCHK_RC_DOUBLE_ARRAY_UNALIGNED;
            }
        }
    }
    return J9MODRON_GCCHK_RC_OK;
}

Example 29 with J9ObjectPointer

use of com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer in project openj9 by eclipse.

the class CheckEngine method checkIndexableFlag.

private boolean checkIndexableFlag(J9ObjectPointer object) throws CorruptDataException {
    UDATA classShape = ObjectModel.getClassShape(J9ObjectHelper.clazz(object));
    boolean isIndexable = ObjectModel.isIndexable(object);
    if (classShape.eq(OBJECT_HEADER_SHAPE_POINTERS)) {
        return isIndexable;
    }
    if (classShape.eq(OBJECT_HEADER_SHAPE_BYTES)) {
        return isIndexable;
    }
    if (classShape.eq(OBJECT_HEADER_SHAPE_WORDS)) {
        return isIndexable;
    }
    if (classShape.eq(OBJECT_HEADER_SHAPE_LONGS)) {
        return isIndexable;
    }
    if (classShape.eq(OBJECT_HEADER_SHAPE_DOUBLES)) {
        return isIndexable;
    }
    return !isIndexable;
}

Example 30 with J9ObjectPointer

use of com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer in project openj9 by eclipse.

the class CheckEngine method checkClassHeap.

public int checkClassHeap(J9ClassPointer clazz, J9MemorySegmentPointer segment) {
    int result;
    /*
		 * Verify that this is, in fact, a class
		 */
    try {
        result = checkJ9Class(clazz, segment, _cycle.getCheckFlags());
        if (J9MODRON_GCCHK_RC_OK != result) {
            CheckError error = new CheckError(clazz, _cycle, _currentCheck, "Class ", result, _cycle.nextErrorCount());
            _reporter.report(error);
        }
        /*
			 * Process object slots in the class
			 */
        GCClassIterator classIterator = GCClassIterator.fromJ9Class(clazz);
        while (classIterator.hasNext()) {
            PointerPointer slotPtr = PointerPointer.cast(classIterator.nextAddress());
            J9ObjectPointer object = J9ObjectPointer.cast(slotPtr.at(0));
            result = checkObjectIndirect(object);
            if (J9MODRON_GCCHK_RC_OK != result) {
                String elementName = "";
                switch(classIterator.getState()) {
                    case GCClassIterator.state_statics:
                        elementName = "static ";
                        break;
                    case GCClassIterator.state_constant_pool:
                        elementName = "constant ";
                        break;
                    case GCClassIterator.state_slots:
                        elementName = "slots ";
                        break;
                }
                CheckError error = new CheckError(clazz, slotPtr, _cycle, _currentCheck, elementName, result, _cycle.nextErrorCount());
                _reporter.report(error);
                return J9MODRON_SLOT_ITERATOR_OK;
            }
            if (GCExtensions.isStandardGC()) {
                /* If the slot has its old bit OFF, the class's remembered bit should be ON */
                if (object.notNull() && !ObjectModel.isOld(object)) {
                    if (!ObjectModel.isRemembered(clazz.classObject())) {
                        CheckError error = new CheckError(clazz, slotPtr, _cycle, _currentCheck, "Class ", J9MODRON_GCCHK_RC_REMEMBERED_SET_OLD_OBJECT, _cycle.nextErrorCount());
                        _reporter.report(error);
                        return J9MODRON_SLOT_ITERATOR_OK;
                    }
                }
            }
        }
        if (J9MODRON_GCCHK_RC_OK != checkClassStatics(clazz)) {
            return J9MODRON_SLOT_ITERATOR_OK;
        }
        J9ClassPointer replaced = clazz.replacedClass();
        if (replaced.notNull()) {
            if (!J9ClassHelper.isSwappedOut(replaced)) {
                CheckError error = new CheckError(clazz, clazz.replacedClassEA(), _cycle, _currentCheck, "Class ", J9MODRON_GCCHK_RC_REPLACED_CLASS_HAS_NO_HOTSWAP_FLAG, _cycle.nextErrorCount());
                _reporter.report(error);
                return J9MODRON_SLOT_ITERATOR_OK;
            }
        }
        /*
			 * Process class slots in the class
			 */
        GCClassIteratorClassSlots classIteratorClassSlots = GCClassIteratorClassSlots.fromJ9Class(clazz);
        while (classIteratorClassSlots.hasNext()) {
            PointerPointer classSlotPtr = PointerPointer.cast(classIteratorClassSlots.nextAddress());
            J9ClassPointer classSlot = J9ClassPointer.cast(classSlotPtr.at(0));
            String elementName = "";
            result = J9MODRON_GCCHK_RC_OK;
            switch(classIteratorClassSlots.getState()) {
                case GCClassIteratorClassSlots.state_constant_pool:
                    /* may be NULL */
                    if (classSlot.notNull()) {
                        result = checkJ9ClassPointer(classSlot);
                    }
                    elementName = "constant ";
                    break;
                case GCClassIteratorClassSlots.state_superclasses:
                    /* must not be NULL */
                    result = checkJ9ClassPointer(classSlot);
                    elementName = "superclass ";
                    break;
                case GCClassIteratorClassSlots.state_interfaces:
                    /* must not be NULL */
                    result = checkJ9ClassPointer(classSlot);
                    elementName = "interface ";
                    break;
                case GCClassIteratorClassSlots.state_array_class_slots:
                    /* may be NULL */
                    if (classSlot.notNull()) {
                        result = checkJ9ClassPointer(classSlot);
                    }
                    elementName = "array class ";
            }
            if (J9MODRON_GCCHK_RC_OK != result) {
                CheckError error = new CheckError(clazz, classSlotPtr, _cycle, _currentCheck, elementName, result, _cycle.nextErrorCount());
                _reporter.report(error);
                return J9MODRON_SLOT_ITERATOR_OK;
            }
        }
    } catch (CorruptDataException e) {
        // TODO : cde should be part of the error
        CheckError error = new CheckError(clazz, _cycle, _currentCheck, "Class ", J9MODRON_GCCHK_RC_CORRUPT_DATA_EXCEPTION, _cycle.nextErrorCount());
        _reporter.report(error);
    }
    return J9MODRON_SLOT_ITERATOR_OK;
}