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

Example 1 with ObjectReferencePointer

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

the class GCArrayletObjectModelBase_V1 method getElementAddress.

@Override
public VoidPointer getElementAddress(J9IndexableObjectPointer array, int elementIndex, int elementSize) throws CorruptDataException {
    boolean isInlineContiguous = isInlineContiguousArraylet(array);
    UDATA byteOffsetIntoData = new UDATA(elementIndex * (long) elementSize);
    if (isInlineContiguous) {
        return VoidPointer.cast(getDataPointerForContiguous(array).addOffset(byteOffsetIntoData));
    } else {
        ObjectReferencePointer arrayoid = getArrayoidPointer(array);
        UDATA arrayletIndex = byteOffsetIntoData.rightShift(arrayletLeafLogSize);
        VoidPointer arrayletLeafBaseAddress = VoidPointer.cast(arrayoid.at(arrayletIndex));
        if (arrayletLeafBaseAddress.isNull()) {
            /* this can happen if the arraylet wasn't fully initialized */
            throw new NoSuchElementException("Arraylet leaf not yet initialized");
        }
        UDATA indexIntoArraylet = byteOffsetIntoData.bitAnd(arrayletLeafSizeMask);
        return arrayletLeafBaseAddress.addOffset(indexIntoArraylet);
    }
}

Example 2 with ObjectReferencePointer

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

the class CheckEngine method checkSlotObjectHeap.

public int checkSlotObjectHeap(J9ObjectPointer object, ObjectReferencePointer objectIndirect, GCHeapRegionDescriptor regionDesc, J9ObjectPointer objectIndirectBase) {
    if (object.isNull()) {
        return J9MODRON_SLOT_ITERATOR_OK;
    }
    int result = checkObjectIndirect(object);
    /* might the heap include dark matter? If so, ignore most errors */
    if ((_cycle.getMiscFlags() & J9MODRON_GCCHK_MISC_DARKMATTER) != 0) {
        /* only report a subset of errors -- the rest are expected to be found in dark matter */
        switch(result) {
            case J9MODRON_GCCHK_RC_OK:
            case J9MODRON_GCCHK_RC_UNALIGNED:
            case J9MODRON_GCCHK_RC_STACK_OBJECT:
                break;
            /* These errors are unlikely, but not impossible to find in dark matter. 
			 * Leave them enabled because they can help find real corruption
			 */
            case J9MODRON_GCCHK_RC_NOT_FOUND:
                /* can happen due to contraction */
                break;
            /* other errors in possible dark matter are expected, so ignore them and don't 
			 * investigate this pointer any further 
			 */
            default:
                return J9MODRON_GCCHK_RC_OK;
        }
    }
    boolean isIndexable = false;
    boolean scavengerEnabled = false;
    try {
        isIndexable = ObjectModel.isIndexable(objectIndirectBase);
        scavengerEnabled = GCExtensions.scavengerEnabled();
    } catch (CorruptDataException e) {
        // TODO : cde should be part of the error
        CheckError error = new CheckError(object, _cycle, _currentCheck, "Object ", J9MODRON_GCCHK_RC_CORRUPT_DATA_EXCEPTION, _cycle.nextErrorCount());
        _reporter.report(error);
        return J9MODRON_SLOT_ITERATOR_UNRECOVERABLE_ERROR;
    }
    if (J9MODRON_GCCHK_RC_OK != result) {
        String elementName = isIndexable ? "IObject " : "Object ";
        CheckError error = new CheckError(objectIndirectBase, objectIndirect, _cycle, _currentCheck, elementName, result, _cycle.nextErrorCount());
        _reporter.report(error);
        return J9MODRON_SLOT_ITERATOR_OK;
    }
    if (J9BuildFlags.gc_generational) {
        if (scavengerEnabled) {
            GCHeapRegionDescriptor objectRegion = findRegionForPointer(object, regionDesc);
            if (objectRegion == null) {
                /* should be impossible, since checkObjectIndirect() already verified that the object exists */
                return J9MODRON_GCCHK_RC_NOT_FOUND;
            }
            if (object.notNull()) {
                UDATA regionType;
                UDATA objectRegionType;
                boolean isRemembered;
                boolean isOld;
                try {
                    regionType = regionDesc.getTypeFlags();
                    objectRegionType = objectRegion.getTypeFlags();
                    isRemembered = ObjectModel.isRemembered(objectIndirectBase);
                    isOld = ObjectModel.isOld(object);
                } catch (CorruptDataException e) {
                    // TODO : cde should be part of the error
                    CheckError error = new CheckError(objectIndirectBase, _cycle, _currentCheck, "Object ", J9MODRON_GCCHK_RC_CORRUPT_DATA_EXCEPTION, _cycle.nextErrorCount());
                    _reporter.report(error);
                    return J9MODRON_SLOT_ITERATOR_UNRECOVERABLE_ERROR;
                }
                /* Old objects that point to new objects should have remembered bit ON */
                if (regionType.allBitsIn(MEMORY_TYPE_OLD) && objectRegionType.allBitsIn(MEMORY_TYPE_NEW) && !isRemembered) {
                    String elementName = isIndexable ? "IObject " : "Object ";
                    CheckError error = new CheckError(objectIndirectBase, objectIndirect, _cycle, _currentCheck, elementName, J9MODRON_GCCHK_RC_NEW_POINTER_NOT_REMEMBERED, _cycle.nextErrorCount());
                    _reporter.report(error);
                    return J9MODRON_SLOT_ITERATOR_OK;
                }
                /* Old objects that point to objects with old bit OFF should have remembered bit ON */
                if (regionType.allBitsIn(MEMORY_TYPE_OLD) && !isOld && !isRemembered) {
                    String elementName = isIndexable ? "IObject " : "Object ";
                    CheckError error = new CheckError(objectIndirectBase, objectIndirect, _cycle, _currentCheck, elementName, J9MODRON_GCCHK_RC_REMEMBERED_SET_OLD_OBJECT, _cycle.nextErrorCount());
                    _reporter.report(error);
                    return J9MODRON_SLOT_ITERATOR_OK;
                }
            }
        }
    }
    return J9MODRON_SLOT_ITERATOR_OK;
}