Examples with U8Pointer com.ibm.j9ddr.vm29.pointer.U8Pointer used on opensource projects

Example 31 with U8Pointer

use of com.ibm.j9ddr.vm29.pointer.U8Pointer in project openj9 by eclipse.

the class RuntimeTypeResolutionHelper method findRuntimeType.

// Design 42819
// Discover runtime type based on identifier field.
public static String findRuntimeType(String type, Pointer ptr, Context context) {
    StructureDescriptor fieldOwner = null;
    FieldDescriptor typeIdField = null;
    String classType = null;
    // not just as the top of the hierarchy, so we have to look at each level.
    try {
        if (ptr.notNull()) {
            // Skip the "!"
            classType = StructureCommandUtil.typeToCommand(type).substring(1);
            do {
                fieldOwner = StructureCommandUtil.getStructureDescriptor(classType, context);
                if (null != fieldOwner) {
                    for (FieldDescriptor aField : fieldOwner.getFields()) {
                        if (aField.getDeclaredName().equals("_typeId")) {
                            typeIdField = aField;
                            break;
                        }
                    }
                    if (null == typeIdField) {
                        classType = fieldOwner.getSuperName();
                    }
                }
            } while ((null == typeIdField) && (null != classType) && (null != fieldOwner) && (classType.length() > 0));
        }
        if (null != typeIdField) {
            VoidPointer untypedStrPtr = PointerPointer.cast(ptr).addOffset(typeIdField.getOffset()).at(0);
            if (untypedStrPtr.notNull()) {
                U8Pointer typeStrPtr = U8Pointer.cast(untypedStrPtr);
                type = typeStrPtr.getCStringAtOffset(0).toLowerCase();
            }
        }
    } catch (CorruptDataException e) {
    // Do nothing.
    }
    return RuntimeTypeResolutionUtils.cleanTypeStr(type);
}

Example 32 with U8Pointer

use of com.ibm.j9ddr.vm29.pointer.U8Pointer in project openj9 by eclipse.

the class RomClassWalker method allSlotsInAnnotationDo.

int allSlotsInAnnotationDo(U32Pointer annotation, String annotationSectionName) throws CorruptDataException {
    int increment = 0;
    int annotationLength = annotation.at(0).intValue();
    /* determine how many U_32 sized chunks to increment initialValue by
		 * NOTE: annotation length is U_32 and does not include the length field itself
		 * annotations are padded to U_32 which is also not included in the length field*/
    int padding = U32.SIZEOF - (annotationLength % U32.SIZEOF);
    increment = annotationLength / U32.SIZEOF;
    if (U32.SIZEOF == padding) {
        padding = 0;
    }
    if (padding > 0) {
        increment++;
    }
    classWalkerCallback.addSlot(clazz, SlotType.J9_U32, annotation, "annotation length");
    int count = annotationLength;
    U8Pointer cursor = U8Pointer.cast(annotation.add(1));
    for (; count > 0; count--) {
        classWalkerCallback.addSlot(clazz, SlotType.J9_U8, cursor, "annotation data");
        cursor = cursor.add(1);
    }
    count = padding;
    for (; count > 0; count--) {
        classWalkerCallback.addSlot(clazz, SlotType.J9_U8, cursor, "annotation padding");
        cursor = cursor.add(1);
    }
    /* move past the annotation length */
    increment += 1;
    classWalkerCallback.addSection(clazz, annotation, increment * U32.SIZEOF, annotationSectionName, true);
    return increment;
}

Example 33 with U8Pointer

use of com.ibm.j9ddr.vm29.pointer.U8Pointer in project openj9 by eclipse.

the class FindMethodFromPcCommand method run.

public void run(String command, String[] args, Context context, PrintStream out) throws DDRInteractiveCommandException {
    try {
        long address = CommandUtils.parsePointer(args[0], J9BuildFlags.env_data64);
        U8Pointer pc = U8Pointer.cast(address);
        J9JavaVMPointer vm = J9RASHelper.getVM(DataType.getJ9RASPointer());
        if (pc.isNull()) {
            CommandUtils.dbgPrint(out, "bad or missing PC\n");
            return;
        }
        CommandUtils.dbgPrint(out, "Searching for PC=%s in VM=%s...\n", pc.getHexAddress(), vm.getHexAddress());
        J9MethodPointer result = J9JavaVMHelper.getMethodFromPC(vm, pc);
        if (!result.isNull()) {
            CommandUtils.dbgPrint(out, "!j9method %s %s\n", result.getHexAddress(), J9MethodHelper.getName(result));
            CommandUtils.dbgPrint(out, "Bytecode PC offset = %s\n", pc.sub(result.bytecodes()).getHexValue());
        } else {
            CommandUtils.dbgPrint(out, "Not found\n");
        }
    } catch (CorruptDataException e) {
        throw new DDRInteractiveCommandException(e);
    }
}

Example 34 with U8Pointer

use of com.ibm.j9ddr.vm29.pointer.U8Pointer in project openj9 by eclipse.

the class JitstackCommand method run.

public void run(String command, String[] args, Context context, PrintStream out) throws DDRInteractiveCommandException {
    if (!J9BuildFlags.interp_nativeSupport) {
        CommandUtils.dbgPrint(out, "No JIT in this build\n");
        return;
    }
    try {
        String[] realArgs = null;
        if (args.length != 0) {
            realArgs = args[0].split(",");
        }
        if (args.length == 0 || !((realArgs.length == 3) || (realArgs.length == 4))) {
            CommandUtils.dbgPrint(out, "Usage:\n");
            CommandUtils.dbgPrint(out, "\t!jitstack thread,sp,pc\n");
            CommandUtils.dbgPrint(out, "\t!jitstack thread,sp,pc,els\n");
            CommandUtils.dbgPrint(out, "\tUse !jitstackslots instead of !jitstack to see slot values\n");
            return;
        }
        long address = CommandUtils.parsePointer(realArgs[0], J9BuildFlags.env_data64);
        J9VMThreadPointer thread = J9VMThreadPointer.cast(address);
        StackWalkerUtils.enableVerboseLogging(2, out);
        WalkState walkState = new WalkState();
        address = CommandUtils.parsePointer(realArgs[1], J9BuildFlags.env_data64);
        UDATAPointer sp = UDATAPointer.cast(address);
        address = CommandUtils.parsePointer(realArgs[2], J9BuildFlags.env_data64);
        U8Pointer pc = U8Pointer.cast(address);
        UDATAPointer arg0EA = UDATAPointer.NULL;
        J9MethodPointer literals = J9MethodPointer.NULL;
        J9VMEntryLocalStoragePointer entryLocalStorage = J9VMEntryLocalStoragePointer.NULL;
        if (realArgs.length == 4) {
            address = CommandUtils.parsePointer(realArgs[3], J9BuildFlags.env_data64);
            entryLocalStorage = J9VMEntryLocalStoragePointer.cast(address);
        } else {
            entryLocalStorage = thread.entryLocalStorage();
        }
        walkState.flags = J9_STACKWALK_RECORD_BYTECODE_PC_OFFSET;
        walkState.flags |= J9_STACKWALK_START_AT_JIT_FRAME;
        if (command.equalsIgnoreCase("!jitstackslots")) {
            walkState.flags |= J9_STACKWALK_ITERATE_O_SLOTS;
            // 100 is highly arbitrary but basically means "print everything".
            // It is used in jextract where the message levels have been copied
            // from to begin with, so it should mean we get the same output.
            StackWalkerUtils.enableVerboseLogging(100, out);
        }
        walkState.walkThread = thread;
        walkState.callBacks = new BaseStackWalkerCallbacks();
        walkState.frameFlags = new UDATA(0);
        StackWalkResult result = StackWalker.walkStackFrames(walkState, sp, arg0EA, pc, literals, entryLocalStorage);
        if (result != StackWalkResult.NONE) {
            out.println("Stack walk result: " + result);
        }
        StackWalkerUtils.disableVerboseLogging();
        out.flush();
    } catch (CorruptDataException e) {
        throw new DDRInteractiveCommandException(e);
    }
}

Example 35 with U8Pointer

use of com.ibm.j9ddr.vm29.pointer.U8Pointer in project openj9 by eclipse.

the class LocalMapCommand method run.

public void run(String command, String[] args, Context context, PrintStream out) throws DDRInteractiveCommandException {
    try {
        if (args.length != 1) {
            CommandUtils.dbgPrint(out, "bad or missing PC\n");
            return;
        }
        J9JavaVMPointer vm = J9RASHelper.getVM(DataType.getJ9RASPointer());
        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 localMethod = J9JavaVMHelper.getMethodFromPC(vm, pc);
        if (localMethod.notNull()) {
            int[] localMap = new int[65536 / 32];
            CommandUtils.dbgPrint(out, "Found method %s !j9method %s\n", J9MethodHelper.getName(localMethod), localMethod.getHexAddress());
            UDATA offsetPC = new UDATA(pc.sub(U8Pointer.cast(localMethod.bytecodes())));
            CommandUtils.dbgPrint(out, "Relative PC = %d\n", offsetPC.longValue());
            J9ClassPointer localClass = J9_CLASS_FROM_CP(localMethod.constantPool());
            long methodIndex = new UDATA(localMethod.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());
            U16 tempCount = localROMMethod.tempCount();
            U8 argCount = localROMMethod.argCount();
            long localCount = tempCount.add(argCount).longValue();
            if (localCount > 0) {
                int errorCode = LocalMap.j9localmap_LocalBitsForPC(localROMMethod, offsetPC, localMap);
                if (errorCode != 0) {
                    CommandUtils.dbgPrint(out, "Local map failed, error code = %d\n", errorCode);
                } else {
                    int currentDescription = localMap[(int) ((localCount + 31) / 32)];
                    long descriptionLong = 0;
                    CommandUtils.dbgPrint(out, "Local map (%d slots mapped): local %d --> ", localCount, localCount - 1);
                    long bitsRemaining = localCount % 32;
                    if (bitsRemaining != 0) {
                        descriptionLong = currentDescription << (32 - bitsRemaining);
                        currentDescription--;
                    }
                    while (localCount != 0) {
                        if (bitsRemaining == 0) {
                            descriptionLong = currentDescription;
                            currentDescription--;
                            bitsRemaining = 32;
                        }
                        CommandUtils.dbgPrint(out, "%d", (descriptionLong & (1 << 32)) != 0 ? 1 : 0);
                        descriptionLong = descriptionLong << 1;
                        --bitsRemaining;
                        --localCount;
                    }
                    CommandUtils.dbgPrint(out, " <-- local 0\n");
                }
            } else {
                CommandUtils.dbgPrint(out, "No locals to map\n");
            }
        } else {
            CommandUtils.dbgPrint(out, "Not found\n");
        }
    } catch (CorruptDataException e) {
        throw new DDRInteractiveCommandException(e);
    }
}