Examples with UDATA com.ibm.j9ddr.vm29.types.UDATA used on opensource projects

Example 36 with UDATA

use of com.ibm.j9ddr.vm29.types.UDATA in project openj9 by eclipse.

the class VmCheckCommand method verifyUTF8.

private boolean verifyUTF8(J9UTF8Pointer utf8) throws CorruptDataException {
    if (utf8.isNull()) {
        return false;
    }
    UDATA length = new UDATA(utf8.length());
    U8Pointer utf8Data = utf8.dataEA();
    while (length.longValue() > 0) {
        // not used
        U16 temp = new U16(0);
        U32 lengthRead = decodeUTF8CharN(utf8Data, temp, length);
        if (lengthRead.eq(0)) {
            return false;
        }
        length = length.sub(lengthRead);
        utf8Data = utf8Data.addOffset(lengthRead);
    }
    return true;
}

Example 37 with UDATA

use of com.ibm.j9ddr.vm29.types.UDATA in project openj9 by eclipse.

the class ShowDumpAgentsCommand method seekDumpAgent.

private J9RASdumpAgentPointer seekDumpAgent(J9JavaVMPointer vm, J9RASdumpAgentPointer agentPtr, J9RASdumpFunctionsPointer dumpFn) throws CorruptDataException {
    J9RASdumpFunctionsPointer func = vm.j9rasDumpFunctions();
    J9RASdumpQueuePointer queue = J9RASdumpQueuePointer.cast(func);
    // Windows 64 bit returns a key of 0xFFFFFFFFFACADEDC
    // Other 64 bit platforms return 0x00000000FACADEDC.
    // Mask off the top bits since the key is 32 bits anyway.
    UDATA reserved = UDATA.roundToSizeofU32(UDATA.cast(queue.facade().reserved()));
    reserved = reserved.bitAnd(0x00000000FFFFFFFFl);
    if (!DUMP_FACADE_KEY.equals(reserved)) {
        // Dump functions have not been configured. (-Xdump:none was probably specified.)#
        return null;
    }
    /*
		 * Sanity check
		 */
    if (!queue.isNull()) {
        J9RASdumpAgentPointer node = agentPtr;
        /* Start from next agent, else start from the beginning */
        node = (node != null && !node.isNull()) ? node.nextPtr() : queue.agents();
        /* Agents with same dumpFn will be found in priority order */
        while (node != null && !node.isNull() && dumpFn != null && !dumpFn.isNull() && node.dumpFn().getAddress() != dumpFn.getAddress()) {
            node = node.nextPtr();
        }
        /* Update the current position */
        agentPtr = node;
        return node;
    }
    /* Blank current position */
    agentPtr = J9RASdumpAgentPointer.NULL;
    return agentPtr;
}

Example 38 with UDATA

use of com.ibm.j9ddr.vm29.types.UDATA in project openj9 by eclipse.

the class StackmapCommand method run.

/**
 *  Java representation of j9dbgext.c#dbgext_stackmap function.
 *
 *  @param  command DDR extension command of stackmap.
 *                  It is supposed to be "stackmap" if this method is being called.
 *  @param  args    Arguments passed to !stackmap DDR extension.
 *                  Only one argument is expected since !stackmap expects only the address.
 *  @param  context Current context that DDR is running on.
 *  @param  out     Print stream to write the output.
 *
 *  @return void
 */
public void run(String command, String[] args, Context context, PrintStream out) throws DDRInteractiveCommandException {
    if (args.length != 1) {
        printUsage(out);
        return;
    }
    try {
        J9JavaVMPointer vm = J9RASHelper.getVM(DataType.getJ9RASPointer());
        if (null == vm) {
            out.println("vm can not be found.");
        }
        long address = CommandUtils.parsePointer(args[0], J9BuildFlags.env_data64);
        U8Pointer pc = U8Pointer.cast(address);
        CommandUtils.dbgPrint(out, "Searching for PC=%d in VM=%s...\n", pc.longValue(), vm.getHexAddress());
        J9MethodPointer remoteMethod = J9JavaVMHelper.getMethodFromPC(vm, pc);
        if (remoteMethod.notNull()) {
            int[] stackMap = new int[MAX_STACKSLOTS_COUNT / INT_SIZE_IN_BITS];
            int leftMostBitIntMask = 1 << (INT_SIZE_IN_BITS - 1);
            CommandUtils.dbgPrint(out, "Found method %s !j9method %s\n", J9MethodHelper.getName(remoteMethod), remoteMethod.getHexAddress());
            UDATA offsetPC = new UDATA(pc.sub(U8Pointer.cast(remoteMethod.bytecodes())));
            CommandUtils.dbgPrint(out, "Relative PC = %d\n", offsetPC.longValue());
            J9ClassPointer localClass = J9_CLASS_FROM_CP(remoteMethod.constantPool());
            long methodIndex = new UDATA(remoteMethod.sub(localClass.ramMethods())).longValue();
            CommandUtils.dbgPrint(out, "Method index is %d\n", methodIndex);
            J9ROMMethodPointer localROMMethod = J9ROMCLASS_ROMMETHODS(localClass.romClass());
            while (methodIndex != 0) {
                localROMMethod = ROMHelp.nextROMMethod(localROMMethod);
                --methodIndex;
            }
            CommandUtils.dbgPrint(out, "Using ROM method %s\n", localROMMethod.getHexAddress());
            /*
				 * This call will return the depth of the stack or errorcode in case of a failure.
				 */
            int errorCode = StackMap.j9stackmap_StackBitsForPC(offsetPC, localClass.romClass(), localROMMethod, null, 0);
            if (0 > errorCode) {
                CommandUtils.dbgPrint(out, "Stack map failed, error code = %d\n", errorCode);
            } else {
                int stackMapIndex = 0;
                if (0 != errorCode) {
                    /* This call to j9stackmap_StackBitsForPC will fill the stackMap */
                    errorCode = StackMap.j9stackmap_StackBitsForPC(offsetPC, localClass.romClass(), localROMMethod, stackMap, errorCode);
                    int currentDescription = stackMap[stackMapIndex];
                    int descriptionInt = 0;
                    CommandUtils.dbgPrint(out, "Stack map (%d slots mapped): ", errorCode);
                    long bitsRemaining = errorCode % INT_SIZE_IN_BITS;
                    if (bitsRemaining != 0) {
                        descriptionInt = currentDescription << (INT_SIZE_IN_BITS - bitsRemaining);
                        currentDescription++;
                    }
                    while (errorCode != 0) {
                        if (bitsRemaining == 0) {
                            descriptionInt = currentDescription;
                            currentDescription = stackMap[++stackMapIndex];
                            bitsRemaining = INT_SIZE_IN_BITS;
                        }
                        CommandUtils.dbgPrint(out, "%d", (descriptionInt & (leftMostBitIntMask)) != 0 ? 1 : 0);
                        descriptionInt = descriptionInt << 1;
                        --bitsRemaining;
                        --errorCode;
                    }
                    CommandUtils.dbgPrint(out, "\n");
                } else {
                    CommandUtils.dbgPrint(out, "Stack is empty\n");
                }
            }
        } else {
            CommandUtils.dbgPrint(out, "Not found\n");
        }
    } catch (CorruptDataException e) {
    }
}

Example 39 with UDATA

use of com.ibm.j9ddr.vm29.types.UDATA in project openj9 by eclipse.

the class VmCheckCommand method decodeUTF8CharN.

/**
 * Decode the UTF8 character.
 *
 * Decode the input UTF8 character and stores it into result.
 *
 * @param[in] input The UTF8 character
 * @param[out] result buffer for unicode characters
 * @param[in] bytesRemaining number of bytes remaining in input
 *
 * @return The number of UTF8 characters consumed (1,2,3) on success, 0 on
 *         failure
 * @throws CorruptDataException
 * @note Don't read more than bytesRemaining characters.
 * @note If morecharacters are required to fully decode the character,
 *       return failure
 */
U32 decodeUTF8CharN(U8Pointer input, /**
 * not used *
 */
U16 result, UDATA bytesRemaining) throws CorruptDataException {
    U8 c;
    U8Pointer cursor = input;
    if (bytesRemaining.longValue() < 1) {
        return new U32(0);
    }
    c = cursor.at(0);
    cursor = cursor.add(1);
    if (c.eq(0x0)) {
        /* illegal NUL encoding */
        return new U32(0);
    } else if ((c.bitAnd(0x80)).eq(0x0)) {
        // *result = (U_16)c;
        return new U32(1);
    } else if (c.bitAnd(0xE0).eq(0xC0)) {
        /* two byte encoding */
        U16 unicodeC;
        if (bytesRemaining.lt(2)) {
            return new U32(0);
        }
        unicodeC = new U16(c.bitAnd(0x1F).leftShift(6));
        c = cursor.at(0);
        cursor = cursor.add(1);
        unicodeC = unicodeC.add(new U16(unicodeC.add(c.bitAnd(0x3F))));
        if (!c.bitAnd(0xC0).eq(0x80)) {
            return new U32(0);
        }
        // *result = unicodeC;
        return new U32(2);
    } else if (c.bitAnd(0xF0).eq(0xE0)) {
        /* three byte encoding */
        U16 unicodeC;
        if (bytesRemaining.lt(3)) {
            return new U32(0);
        }
        unicodeC = new U16(c.bitAnd(0x0F).leftShift(12));
        c = cursor.at(0);
        cursor = cursor.add(1);
        unicodeC = unicodeC.add(new U16(c.bitAnd(0x3F).leftShift(6)));
        if (!c.bitAnd(0xC0).eq(0x80)) {
            return new U32(0);
        }
        c = cursor.at(0);
        cursor = cursor.add(1);
        unicodeC = unicodeC.add(new U16(c.bitAnd(0x3F)));
        if (!c.bitAnd(0xC0).eq(0x80)) {
            return new U32(0);
        }
        // *result = unicodeC;
        return new U32(3);
    } else {
        return new U32(0);
    }
}

Example 40 with UDATA

use of com.ibm.j9ddr.vm29.types.UDATA 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;
}