Examples with GCClassIterator com.ibm.j9ddr.vm29.j9.gc.GCClassIterator used on opensource projects

Example 1 with GCClassIterator

use of com.ibm.j9ddr.vm29.j9.gc.GCClassIterator 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;
}

Example 2 with GCClassIterator

use of com.ibm.j9ddr.vm29.j9.gc.GCClassIterator in project openj9 by eclipse.

the class LiveSetWalker method scanObject.

private static void scanObject(HashSet<J9ObjectPointer> visitedObjects, ObjectVisitor visitor, J9ObjectPointer object, VoidPointer address) {
    if (visitedObjects.contains(object)) {
        return;
    }
    if (!visitor.visit(object, address)) {
        return;
    }
    visitedObjects.add(object);
    try {
        GCObjectIterator objectIterator = GCObjectIterator.fromJ9Object(object, true);
        GCObjectIterator addressIterator = GCObjectIterator.fromJ9Object(object, true);
        while (objectIterator.hasNext()) {
            J9ObjectPointer slot = objectIterator.next();
            VoidPointer addr = addressIterator.nextAddress();
            if (slot.notNull()) {
                scanObject(visitedObjects, visitor, slot, addr);
            }
        }
        if (J9ObjectHelper.getClassName(object).equals("java/lang/Class")) {
            J9ClassPointer clazz = ConstantPoolHelpers.J9VM_J9CLASS_FROM_HEAPCLASS(object);
            // Iterate the Object slots
            GCClassIterator classIterator = GCClassIterator.fromJ9Class(clazz);
            GCClassIterator classAddressIterator = GCClassIterator.fromJ9Class(clazz);
            while (classIterator.hasNext()) {
                J9ObjectPointer slot = classIterator.next();
                VoidPointer addr = classAddressIterator.nextAddress();
                if (slot.notNull()) {
                    scanObject(visitedObjects, visitor, slot, addr);
                }
            }
            // Iterate the Class slots
            GCClassIteratorClassSlots classSlotIterator = GCClassIteratorClassSlots.fromJ9Class(clazz);
            GCClassIteratorClassSlots classSlotAddressIterator = GCClassIteratorClassSlots.fromJ9Class(clazz);
            while (classSlotIterator.hasNext()) {
                J9ClassPointer slot = classSlotIterator.next();
                VoidPointer addr = classSlotAddressIterator.nextAddress();
                J9ObjectPointer classObject = ConstantPoolHelpers.J9VM_J9CLASS_TO_HEAPCLASS(slot);
                if (classObject.notNull()) {
                    scanObject(visitedObjects, visitor, classObject, addr);
                }
            }
        }
    } catch (CorruptDataException e) {
        EventManager.raiseCorruptDataEvent("Corruption found while walking the live set, object: " + object.getHexAddress(), e, false);
    }
    visitor.finishVisit(object, address);
}