Example usage for org.objectweb.asm Opcodes ALOAD

List of usage examples for org.objectweb.asm Opcodes ALOAD

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In this page you can find the example usage for org.objectweb.asm Opcodes ALOAD.

Prototype

int ALOAD

To view the source code for org.objectweb.asm Opcodes ALOAD.

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Usage

From source file:de.zib.sfs.instrument.DirectByteBufferAdapter.java

License:BSD License

@Override
protected void wrapMethod(int access, String name, Type returnType, Type[] argumentTypes, String signature,
        String[] exceptions, String callbackName, Type additionalCallbackArgumentType,
        ResultPasser resultPasser) {/*from www .j  a va  2s  .co m*/
    argumentTypes = argumentTypes == null ? new Type[] {} : argumentTypes;
    String methodDescriptor = Type.getMethodDescriptor(returnType, argumentTypes);

    // <access> <returnType> <name>(<argumentTypes> arguments) throws
    // <exceptions> {
    MethodVisitor mv = this.cv.visitMethod(access, name, methodDescriptor, signature, exceptions);
    mv.visitCode();

    // if (isInstrumentationActive() || !fromFileChannel) {
    isInstrumentationActive(mv);
    Label instrumentationActiveLabel = new Label();
    mv.visitJumpInsn(Opcodes.IFNE, instrumentationActiveLabel);

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, this.instrumentedTypeInternalName, "fromFileChannel",
            Type.getDescriptor(Boolean.TYPE));
    Label fromFileChannelLabel = new Label();
    mv.visitJumpInsn(Opcodes.IFNE, fromFileChannelLabel);

    mv.visitLabel(instrumentationActiveLabel);

    // return? methodPrefix<name>(arguments);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    int argumentIndex = 1;
    for (Type argument : argumentTypes) {
        mv.visitVarInsn(argument.getOpcode(Opcodes.ILOAD), argumentIndex);
        argumentIndex += argument.getSize();
    }
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, this.instrumentedTypeInternalName, this.methodPrefix + name,
            methodDescriptor, false);
    if (!Type.VOID_TYPE.equals(returnType)) {
        mv.visitInsn(returnType.getOpcode(Opcodes.IRETURN));
    } else {
        mv.visitInsn(Opcodes.RETURN);
    }

    // }
    mv.visitLabel(fromFileChannelLabel);

    // setInstrumentationActive(true);
    setInstrumentationActive(mv, true);

    // long startTime = System.nanoTime();
    int startTimeIndex = 1;
    for (Type argument : argumentTypes) {
        startTimeIndex += argument.getSize();
    }
    storeTime(mv, startTimeIndex);

    // <returnType> result =? methodPrefix<name>(arguments);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    argumentIndex = 1;
    for (Type argument : argumentTypes) {
        mv.visitVarInsn(argument.getOpcode(Opcodes.ILOAD), argumentIndex);
        argumentIndex += argument.getSize();
    }
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, this.instrumentedTypeInternalName, this.methodPrefix + name,
            methodDescriptor, false);
    int endTimeIndex = startTimeIndex + 2;
    if (!Type.VOID_TYPE.equals(returnType)) {
        mv.visitVarInsn(returnType.getOpcode(Opcodes.ISTORE), startTimeIndex + 2);
        endTimeIndex += returnType.getSize();
    }

    // long endTime = System.nanoTime();
    storeTime(mv, endTimeIndex);

    // callback.<callbackMethod>(startTime, endTime, result?);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, this.instrumentedTypeInternalName, "callback",
            this.callbackTypeDescriptor);
    mv.visitVarInsn(Opcodes.LLOAD, startTimeIndex);
    mv.visitVarInsn(Opcodes.LLOAD, endTimeIndex);

    // -1 indicates no result should be passed
    int resultIndex = resultPasser.getResultIndex();
    if (resultIndex != -1) {
        // result of the actual operation requested
        if (resultIndex == 0) {
            mv.visitVarInsn(returnType.getOpcode(Opcodes.ILOAD), startTimeIndex + 2);
            resultPasser.passResult(mv);
        } else {
            // some parameter requested
            mv.visitVarInsn(argumentTypes[resultIndex - 1].getOpcode(Opcodes.ILOAD), resultIndex);
            resultPasser.passResult(mv);
        }
    }

    Type[] callbackArgumentTypes;
    if (additionalCallbackArgumentType == null) {
        callbackArgumentTypes = new Type[] { Type.LONG_TYPE, Type.LONG_TYPE };
    } else {
        callbackArgumentTypes = new Type[] { Type.LONG_TYPE, Type.LONG_TYPE, additionalCallbackArgumentType };
    }
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, this.callbackTypeInternalName, callbackName,
            Type.getMethodDescriptor(Type.VOID_TYPE, callbackArgumentTypes), false);

    // setInstrumentationActive(false);
    setInstrumentationActive(mv, false);

    // return result;?
    // }
    if (!Type.VOID_TYPE.equals(returnType)) {
        mv.visitVarInsn(returnType.getOpcode(Opcodes.ILOAD), startTimeIndex + 2);
        mv.visitInsn(returnType.getOpcode(Opcodes.IRETURN));
    } else {
        mv.visitInsn(Opcodes.RETURN);
    }
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}

From source file:de.zib.sfs.instrument.FileChannelImplAdapter.java

License:BSD License

@Override
protected void initializeFields(MethodVisitor constructorMV, String constructorDesc) {
    // callback.openCallback(fd);
    constructorMV.visitVarInsn(Opcodes.ALOAD, 0);
    constructorMV.visitFieldInsn(Opcodes.GETFIELD, this.instrumentedTypeInternalName, "callback",
            this.callbackTypeDescriptor);
    constructorMV.visitVarInsn(Opcodes.ALOAD, 0);
    constructorMV.visitFieldInsn(Opcodes.GETFIELD, this.instrumentedTypeInternalName, "fd",
            Type.getDescriptor(FileDescriptor.class));
    constructorMV.visitMethodInsn(Opcodes.INVOKEVIRTUAL, this.callbackTypeInternalName, "openCallback",
            Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(FileDescriptor.class)), false);
}

From source file:de.zib.sfs.instrument.FileChannelImplAdapter.java

License:BSD License

@Override
protected void appendWrappedMethods(ClassVisitor visitor) {
    // public FileDescriptor getFileDescriptor() {
    MethodVisitor getFileDescriptorMV = visitor.visitMethod(Opcodes.ACC_PUBLIC, "getFileDescriptor",
            Type.getMethodDescriptor(Type.getType(FileDescriptor.class)), null, null);
    getFileDescriptorMV.visitCode();/*from  w w  w.  ja v a  2 s  .c  om*/

    // return fileDescriptor;
    // }
    getFileDescriptorMV.visitVarInsn(Opcodes.ALOAD, 0);
    getFileDescriptorMV.visitFieldInsn(Opcodes.GETFIELD, Type.getInternalName(FileChannelImpl.class), "fd",
            Type.getDescriptor(FileDescriptor.class));
    getFileDescriptorMV.visitInsn(Opcodes.ARETURN);
    getFileDescriptorMV.visitMaxs(0, 0);
    getFileDescriptorMV.visitEnd();

    if (!skipReads()) {
        wrapFileChannelImplMethod(Opcodes.ACC_PUBLIC, "read", Type.INT_TYPE,
                new Type[] { Type.getType(ByteBuffer.class) }, null,
                new String[] { Type.getInternalName(IOException.class) }, "readCallback", "writeCallback",
                Type.INT_TYPE, 0, false);

        wrapFileChannelImplMethod(Opcodes.ACC_PUBLIC, "read", Type.INT_TYPE,
                new Type[] { Type.getType(ByteBuffer.class), Type.LONG_TYPE }, null,
                new String[] { Type.getInternalName(IOException.class) }, "readCallback", "writeCallback",
                Type.INT_TYPE, 0, false);

        wrapFileChannelImplMethod(Opcodes.ACC_PUBLIC, "read", Type.LONG_TYPE,
                new Type[] { Type.getType(ByteBuffer[].class), Type.INT_TYPE, Type.INT_TYPE }, null,
                new String[] { Type.getInternalName(IOException.class) }, "readCallback", "writeCallback",
                Type.LONG_TYPE, 0, false);

        // transferTo is basically a read

        wrapFileChannelImplMethod(Opcodes.ACC_PUBLIC, "transferTo", Type.LONG_TYPE,
                new Type[] { Type.LONG_TYPE, Type.LONG_TYPE, Type.getType(WritableByteChannel.class) }, null,
                new String[] { Type.getInternalName(IOException.class) }, "readCallback", "writeCallback",
                Type.LONG_TYPE, 2, true);
    }

    // repeat for write methods

    if (!skipWrites()) {
        wrapFileChannelImplMethod(Opcodes.ACC_PUBLIC, "write", Type.INT_TYPE,
                new Type[] { Type.getType(ByteBuffer.class) }, null,
                new String[] { Type.getInternalName(IOException.class) }, "writeCallback", "readCallback",
                Type.INT_TYPE, 0, false);

        wrapFileChannelImplMethod(Opcodes.ACC_PUBLIC, "write", Type.INT_TYPE,
                new Type[] { Type.getType(ByteBuffer.class), Type.LONG_TYPE }, null,
                new String[] { Type.getInternalName(IOException.class) }, "writeCallback", "readCallback",
                Type.INT_TYPE, 0, false);

        wrapFileChannelImplMethod(Opcodes.ACC_PUBLIC, "write", Type.LONG_TYPE,
                new Type[] { Type.getType(ByteBuffer[].class), Type.INT_TYPE, Type.INT_TYPE }, null,
                new String[] { Type.getInternalName(IOException.class) }, "writeCallback", "readCallback",
                Type.LONG_TYPE, 0, false);

        // transferFrom is basically a write

        wrapFileChannelImplMethod(Opcodes.ACC_PUBLIC, "transferFrom", Type.LONG_TYPE,
                new Type[] { Type.getType(ReadableByteChannel.class), Type.LONG_TYPE, Type.LONG_TYPE }, null,
                new String[] { Type.getInternalName(IOException.class) }, "writeCallback", "readCallback",
                Type.LONG_TYPE, 0, true);
    }

    String mapMethodDescriptor = Type.getMethodDescriptor(Type.getType(MappedByteBuffer.class),
            Type.getType(MapMode.class), Type.LONG_TYPE, Type.LONG_TYPE);

    // public MappedByteBuffer map(MapMode mode, long position, long size)
    // throws IOException {
    MethodVisitor mapMV = visitor.visitMethod(Opcodes.ACC_PUBLIC, "map", mapMethodDescriptor, null,
            new String[] { Type.getInternalName(IOException.class) });
    mapMV.visitCode();

    // MappedByteBuffer mbb = nativeMethodPrefixmap(mode, position, size);
    mapMV.visitVarInsn(Opcodes.ALOAD, 0);
    mapMV.visitVarInsn(Opcodes.ALOAD, 1);
    mapMV.visitVarInsn(Opcodes.LLOAD, 2);
    mapMV.visitVarInsn(Opcodes.LLOAD, 4);
    mapMV.visitMethodInsn(Opcodes.INVOKESPECIAL, this.instrumentedTypeInternalName, this.methodPrefix + "map",
            mapMethodDescriptor, false);
    mapMV.visitVarInsn(Opcodes.ASTORE, 6);

    // mbb.setFromFileChannel(true);
    mapMV.visitVarInsn(Opcodes.ALOAD, 6);
    mapMV.visitInsn(Opcodes.ICONST_1);
    mapMV.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(MappedByteBuffer.class),
            "setFromFileChannel", Type.getMethodDescriptor(Type.VOID_TYPE, Type.BOOLEAN_TYPE), false);

    // mbb.setFileDescriptor(fd);
    mapMV.visitVarInsn(Opcodes.ALOAD, 6);
    mapMV.visitVarInsn(Opcodes.ALOAD, 0);
    mapMV.visitFieldInsn(Opcodes.GETFIELD, this.instrumentedTypeInternalName, "fd",
            Type.getDescriptor(FileDescriptor.class));
    mapMV.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(MappedByteBuffer.class),
            "setFileDescriptor", Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(FileDescriptor.class)),
            false);

    // if we don't want to trace mmap calls, then map needs to reset the
    // instrumentationActive flag
    if (!this.traceMmap) {
        // setInstrumentationActive(false);
        setInstrumentationActive(mapMV, false);
    }

    // return mbb;
    // }
    mapMV.visitVarInsn(Opcodes.ALOAD, 6);
    mapMV.visitInsn(Opcodes.ARETURN);
    mapMV.visitMaxs(0, 0);
    mapMV.visitEnd();
}

From source file:de.zib.sfs.instrument.FileChannelImplAdapter.java

License:BSD License

protected void wrapFileChannelImplMethod(int access, String name, Type returnType, Type[] argumentTypes,
        String signature, String[] exceptions, String callbackName, String oppositeCallbackName,
        Type additionalCallbackArgumentType, int bufferArgumentTypeIndex, boolean isTransferMethod) {
    String methodDescriptor = Type.getMethodDescriptor(returnType, argumentTypes);

    // <access> <returnType> <name>(<argumentTypes> arguments) throws
    // <exceptions> {
    MethodVisitor mv = this.cv.visitMethod(access, name, methodDescriptor, signature, exceptions);
    mv.visitCode();//from  w ww . jav  a 2s . com

    // if (isInstrumentationActive()) {
    isInstrumentationActive(mv);
    Label instrumentationActiveLabel = new Label();
    mv.visitJumpInsn(Opcodes.IFEQ, instrumentationActiveLabel);

    // return methodPrefix<name>(arguments);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    int argumentIndex = 1;
    for (Type argument : argumentTypes) {
        mv.visitVarInsn(argument.getOpcode(Opcodes.ILOAD), argumentIndex);
        argumentIndex += argument.getSize();
    }
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, this.instrumentedTypeInternalName, this.methodPrefix + name,
            methodDescriptor, false);
    mv.visitInsn(returnType.getOpcode(Opcodes.IRETURN));

    // }
    mv.visitLabel(instrumentationActiveLabel);

    // setInstrumentationActive(true);
    setInstrumentationActive(mv, true);

    // we need to set the instrumentation flag for the source/destination
    // buffer(s) as well

    // boolean bufferInstrumentationActive = false;
    int bufferInstrumentationActiveIndex = 1;
    for (Type argument : argumentTypes) {
        bufferInstrumentationActiveIndex += argument.getSize();
    }
    mv.visitInsn(Opcodes.ICONST_0);
    mv.visitVarInsn(Opcodes.ISTORE, bufferInstrumentationActiveIndex);

    // obtain actual index of the buffer(s) in the argument list
    int bufferArgumentIndex = 1;
    for (int i = 0; i < bufferArgumentTypeIndex; ++i) {
        bufferArgumentIndex += argumentTypes[i].getSize();
    }

    if (argumentTypes[bufferArgumentTypeIndex].getSort() == Type.ARRAY) {
        // If the first buffer in the array is a MappedByteBuffer, assume
        // they all are. If not, this will crash the users' program.

        // if (<buffers>[0] instanceof MappedByteBuffer) {
        mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
        mv.visitInsn(Opcodes.ICONST_0);
        mv.visitInsn(Opcodes.AALOAD);
        mv.visitTypeInsn(Opcodes.INSTANCEOF, Type.getInternalName(MappedByteBuffer.class));
        Label bufferInstanceofMappedByteBufferLabel = new Label();
        mv.visitJumpInsn(Opcodes.IFEQ, bufferInstanceofMappedByteBufferLabel);

        // only trace mmapped file channels if desired
        if (this.traceMmap) {
            // if (<buffers>[0].isFromFileChannel()) {
            mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
            mv.visitInsn(Opcodes.ICONST_0);
            mv.visitInsn(Opcodes.AALOAD);
            mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(MappedByteBuffer.class),
                    "isFromFileChannel", Type.getMethodDescriptor(Type.BOOLEAN_TYPE), false);
            Label fromFileChannelLabel = new Label();
            mv.visitJumpInsn(Opcodes.IFEQ, fromFileChannelLabel);

            int iIndex = bufferInstrumentationActiveIndex + 1;

            // for (int i = 0; i < <buffers>.length; ++i) {
            // <buffers>[i].setInstrumentationActive(true);
            // }
            mv.visitInsn(Opcodes.ICONST_0);
            mv.visitVarInsn(Opcodes.ISTORE, iIndex);
            Label loopConditionLabel = new Label();
            mv.visitJumpInsn(Opcodes.GOTO, loopConditionLabel);
            Label loopStartLabel = new Label();
            mv.visitLabel(loopStartLabel);
            mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
            mv.visitVarInsn(Opcodes.ILOAD, iIndex);
            mv.visitInsn(Opcodes.AALOAD);
            mv.visitInsn(Opcodes.ICONST_1);
            mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(MappedByteBuffer.class),
                    "setInstrumentationActive", Type.getMethodDescriptor(Type.VOID_TYPE, Type.BOOLEAN_TYPE),
                    false);
            mv.visitIincInsn(iIndex, 1);
            mv.visitLabel(loopConditionLabel);
            mv.visitVarInsn(Opcodes.ILOAD, iIndex);
            mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
            mv.visitInsn(Opcodes.ARRAYLENGTH);
            mv.visitJumpInsn(Opcodes.IF_ICMPLT, loopStartLabel);

            // bufferInstrumentationActive = true;
            mv.visitInsn(Opcodes.ICONST_1);
            mv.visitVarInsn(Opcodes.ISTORE, bufferInstrumentationActiveIndex);

            // }
            mv.visitLabel(fromFileChannelLabel);
        }

        // }
        mv.visitLabel(bufferInstanceofMappedByteBufferLabel);
    } else {
        // We need to handle the transferFrom/transferTo methods a little
        // differently. Their "buffers" only need to be FileChannelImpls,
        // the rest remains the same.

        // if (buffer instanceof MappedByteBuffer) {
        // if (buffer instanceof FileChannelImpl) {
        mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
        if (!isTransferMethod) {
            mv.visitTypeInsn(Opcodes.INSTANCEOF, Type.getInternalName(MappedByteBuffer.class));
        } else {
            mv.visitTypeInsn(Opcodes.INSTANCEOF, Type.getInternalName(FileChannelImpl.class));
        }
        Label bufferInstanceofMappedByteBufferLabel = new Label();
        mv.visitJumpInsn(Opcodes.IFEQ, bufferInstanceofMappedByteBufferLabel);

        // additional check required if the buffer is a MappedByteBuffer,
        // and we want to trace those
        Label fromFileChannelLabel = new Label();
        if (!isTransferMethod && this.traceMmap) {
            // if (buffer.isFromFileChannel()) {
            mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
            mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(MappedByteBuffer.class),
                    "isFromFileChannel", Type.getMethodDescriptor(Type.BOOLEAN_TYPE), false);
            mv.visitJumpInsn(Opcodes.IFEQ, fromFileChannelLabel);
        }

        // either we're dealing with a FileChannelImpl (in a
        // transferTo/transferFrom method), or this is a regular read or
        // write and we want to count in mmapped buffers
        if (isTransferMethod || this.traceMmap) {
            // buffer.setInstrumentationActive(true);
            mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
            mv.visitInsn(Opcodes.ICONST_1);
            mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
                    !isTransferMethod ? Type.getInternalName(MappedByteBuffer.class)
                            : Type.getInternalName(FileChannelImpl.class),
                    "setInstrumentationActive", Type.getMethodDescriptor(Type.VOID_TYPE, Type.BOOLEAN_TYPE),
                    false);

            // bufferInstrumentationActive = true;
            mv.visitInsn(Opcodes.ICONST_1);
            mv.visitVarInsn(Opcodes.ISTORE, bufferInstrumentationActiveIndex);
        }

        if (!isTransferMethod && this.traceMmap) {
            // }
            mv.visitLabel(fromFileChannelLabel);
        }

        // }
        mv.visitLabel(bufferInstanceofMappedByteBufferLabel);
    }

    // long startTime = System.nanoTime();
    int startTimeIndex = bufferInstrumentationActiveIndex + 1;
    storeTime(mv, startTimeIndex);

    // <returnType> result = methodPrefix<name>(arguments);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    argumentIndex = 1;
    for (Type argument : argumentTypes) {
        mv.visitVarInsn(argument.getOpcode(Opcodes.ILOAD), argumentIndex);
        argumentIndex += argument.getSize();
    }
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, this.instrumentedTypeInternalName, this.methodPrefix + name,
            methodDescriptor, false);
    int resultIndex = startTimeIndex + 2;
    mv.visitVarInsn(returnType.getOpcode(Opcodes.ISTORE), resultIndex);
    int endTimeIndex = resultIndex + returnType.getSize();

    // long endTime = System.nanoTime();
    storeTime(mv, endTimeIndex);

    // if map(...) was involved in this, then it may have reset the
    // instrumentationActive flag if we don't trace mmap calls, so we need
    // to check again whether instrumentation is still active, and only
    // report the data then

    // if (isInstrumentationActive()) {
    isInstrumentationActive(mv);
    Label instrumentationStillActiveLabel = new Label();
    mv.visitJumpInsn(Opcodes.IFEQ, instrumentationStillActiveLabel);

    // callback.<callbackName>(startTime, endTime, result);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, this.instrumentedTypeInternalName, "callback",
            this.callbackTypeDescriptor);
    mv.visitVarInsn(Opcodes.LLOAD, startTimeIndex);
    mv.visitVarInsn(Opcodes.LLOAD, endTimeIndex);
    mv.visitVarInsn(returnType.getOpcode(Opcodes.ILOAD), resultIndex);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, this.callbackTypeInternalName, callbackName,
            Type.getMethodDescriptor(Type.VOID_TYPE, Type.LONG_TYPE, Type.LONG_TYPE,
                    additionalCallbackArgumentType),
            false);

    // }
    mv.visitLabel(instrumentationStillActiveLabel);

    // same for the buffer

    if (argumentTypes[bufferArgumentTypeIndex].getSort() != Type.ARRAY) {
        // if (buffer instanceof MappedByteBuffer) {
        // if (buffer instanceof FileChannelImpl) {
        mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
        if (!isTransferMethod) {
            mv.visitTypeInsn(Opcodes.INSTANCEOF, Type.getInternalName(MappedByteBuffer.class));
        } else {
            mv.visitTypeInsn(Opcodes.INSTANCEOF, Type.getInternalName(FileChannelImpl.class));
        }
        Label bufferInstanceofMappedByteBufferLabel = new Label();
        mv.visitJumpInsn(Opcodes.IFEQ, bufferInstanceofMappedByteBufferLabel);

        // additional check required if the buffer is a MappedByteBuffer,
        // and we want to trace those
        Label fromFileChannelLabel = new Label();
        if (!isTransferMethod && this.traceMmap) {
            // if (buffer.isFromFileChannel()) {
            mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
            mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(MappedByteBuffer.class),
                    "isFromFileChannel", Type.getMethodDescriptor(Type.BOOLEAN_TYPE), false);
            mv.visitJumpInsn(Opcodes.IFEQ, fromFileChannelLabel);
        }

        // either we're dealing with a FileChannelImpl (in a
        // transferTo/transferFrom method), which might have flipped its
        // instrumentationActive flag because mmap was used, or this is a
        // regular read or write and we want to count in mmapped buffers
        if (isTransferMethod || this.traceMmap) {
            // if traceMmap is true, then we could actually just set
            // bufferInstrumentationActive to true

            // bufferInstrumentationActive =
            // buffer.isInstrumentationActive();
            mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
            mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
                    !isTransferMethod ? Type.getInternalName(MappedByteBuffer.class)
                            : Type.getInternalName(FileChannelImpl.class),
                    "isInstrumentationActive", Type.getMethodDescriptor(Type.BOOLEAN_TYPE), false);
            mv.visitVarInsn(Opcodes.ISTORE, bufferInstrumentationActiveIndex);
        }

        if (!isTransferMethod && this.traceMmap) {
            // }
            mv.visitLabel(fromFileChannelLabel);
        }

        // }
        mv.visitLabel(bufferInstanceofMappedByteBufferLabel);
    }

    // if (bufferInstrumentationActive) {
    mv.visitVarInsn(Opcodes.ILOAD, bufferInstrumentationActiveIndex);
    Label bufferInstrumentationActiveLabel = new Label();
    mv.visitJumpInsn(Opcodes.IFEQ, bufferInstrumentationActiveLabel);

    // callback.<oppositeCallbackName>(buffer.getFileDescriptor(),
    // startTime, endTime, result);
    if (!isTransferMethod) {
        if (argumentTypes[bufferArgumentTypeIndex].getSort() == Type.ARRAY) {
            // TODO this calls the opposite callback only on the first
            // element in the buffer array, but there is not really a way to
            // tell which buffer has received how many bytes, and thus which
            // file
            mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
            mv.visitInsn(Opcodes.ICONST_0);
            mv.visitInsn(Opcodes.AALOAD);
        } else {
            mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
        }
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(MappedByteBuffer.class),
                "getFileDescriptor", Type.getMethodDescriptor(Type.getType(FileDescriptor.class)), false);
    } else {
        mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(FileChannelImpl.class),
                "getFileDescriptor", Type.getMethodDescriptor(Type.getType(FileDescriptor.class)), false);
    }
    mv.visitVarInsn(Opcodes.LLOAD, startTimeIndex);
    mv.visitVarInsn(Opcodes.LLOAD, endTimeIndex);
    mv.visitVarInsn(returnType.getOpcode(Opcodes.ILOAD), resultIndex);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, this.callbackTypeInternalName, oppositeCallbackName,
            Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(FileDescriptor.class), Type.LONG_TYPE,
                    Type.LONG_TYPE, additionalCallbackArgumentType),
            false);

    // revert the active instrumentation flag for the buffer
    if (argumentTypes[bufferArgumentTypeIndex].getSort() == Type.ARRAY) {
        int iIndex = bufferInstrumentationActiveIndex + 1;

        // for (int i = 0; i < <buffers>.length; ++i) {
        // <buffers>[i].setInstrumentationActive(false);
        // }
        mv.visitInsn(Opcodes.ICONST_0);
        mv.visitVarInsn(Opcodes.ISTORE, iIndex);
        Label loopConditionLabel = new Label();
        mv.visitJumpInsn(Opcodes.GOTO, loopConditionLabel);
        Label loopStartLabel = new Label();
        mv.visitLabel(loopStartLabel);
        mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
        mv.visitVarInsn(Opcodes.ILOAD, iIndex);
        mv.visitInsn(Opcodes.AALOAD);
        mv.visitInsn(Opcodes.ICONST_0);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(MappedByteBuffer.class),
                "setInstrumentationActive", Type.getMethodDescriptor(Type.VOID_TYPE, Type.BOOLEAN_TYPE), false);
        mv.visitIincInsn(iIndex, 1);
        mv.visitLabel(loopConditionLabel);
        mv.visitVarInsn(Opcodes.ILOAD, iIndex);
        mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
        mv.visitInsn(Opcodes.ARRAYLENGTH);
        mv.visitJumpInsn(Opcodes.IF_ICMPLT, loopStartLabel);
    } else {
        // buffer.setInstrumentationActive(false);
        mv.visitVarInsn(Opcodes.ALOAD, bufferArgumentIndex);
        mv.visitInsn(Opcodes.ICONST_0);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
                !isTransferMethod ? Type.getInternalName(MappedByteBuffer.class)
                        : Type.getInternalName(FileChannelImpl.class),
                "setInstrumentationActive", Type.getMethodDescriptor(Type.VOID_TYPE, Type.BOOLEAN_TYPE), false);
    }

    // }
    mv.visitLabel(bufferInstrumentationActiveLabel);

    // setInstrumentationActive(false);
    setInstrumentationActive(mv, false);

    // return result;
    // }
    mv.visitVarInsn(returnType.getOpcode(Opcodes.ILOAD), resultIndex);
    mv.visitInsn(returnType.getOpcode(Opcodes.IRETURN));
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}

From source file:de.zib.sfs.instrument.MappedByteBufferAdapter.java

License:BSD License

@Override
protected void initializeFields(MethodVisitor constructorMV, String constructorDesc) {
    // fromFileChannel = false;
    constructorMV.visitVarInsn(Opcodes.ALOAD, 0);
    constructorMV.visitInsn(Opcodes.ICONST_0);
    constructorMV.visitFieldInsn(Opcodes.PUTFIELD, Type.getInternalName(MappedByteBuffer.class),
            "fromFileChannel", Type.getDescriptor(Boolean.TYPE));
}

From source file:de.zib.sfs.instrument.MappedByteBufferAdapter.java

License:BSD License

@Override
protected void appendWrappedMethods(ClassVisitor visitor) {
    // public void setFromFileChannel(boolean fromFileChannel) {
    MethodVisitor setFromFileChannelMV = visitor.visitMethod(Opcodes.ACC_PUBLIC, "setFromFileChannel",
            Type.getMethodDescriptor(Type.VOID_TYPE, Type.BOOLEAN_TYPE), null, null);
    setFromFileChannelMV.visitCode();//from   w ww .  j av a 2 s . c  om

    // this.fromFileChannel = fromFileChannel;
    setFromFileChannelMV.visitVarInsn(Opcodes.ALOAD, 0);
    setFromFileChannelMV.visitVarInsn(Opcodes.ILOAD, 1);
    setFromFileChannelMV.visitFieldInsn(Opcodes.PUTFIELD, Type.getInternalName(MappedByteBuffer.class),
            "fromFileChannel", Type.getDescriptor(Boolean.TYPE));

    // }
    setFromFileChannelMV.visitInsn(Opcodes.RETURN);
    setFromFileChannelMV.visitMaxs(0, 0);
    setFromFileChannelMV.visitEnd();

    // public boolean isFromFileChannel() {
    MethodVisitor isFromFileChannelMV = visitor.visitMethod(Opcodes.ACC_PUBLIC, "isFromFileChannel",
            Type.getMethodDescriptor(Type.BOOLEAN_TYPE), null, null);
    isFromFileChannelMV.visitCode();

    // return fromFileChannel;
    // }
    isFromFileChannelMV.visitVarInsn(Opcodes.ALOAD, 0);
    isFromFileChannelMV.visitFieldInsn(Opcodes.GETFIELD, Type.getInternalName(MappedByteBuffer.class),
            "fromFileChannel", Type.getDescriptor(Boolean.TYPE));
    isFromFileChannelMV.visitInsn(Opcodes.IRETURN);
    isFromFileChannelMV.visitMaxs(0, 0);
    isFromFileChannelMV.visitEnd();

    // public void setFileDescriptor(FileDescriptor fileDescriptor) {
    MethodVisitor settFileDescriptorMV = visitor.visitMethod(Opcodes.ACC_PUBLIC, "setFileDescriptor",
            Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(FileDescriptor.class)), null, null);
    settFileDescriptorMV.visitCode();

    // this.fileDescriptor = fileDescriptor;
    settFileDescriptorMV.visitVarInsn(Opcodes.ALOAD, 0);
    settFileDescriptorMV.visitVarInsn(Opcodes.ALOAD, 1);
    settFileDescriptorMV.visitFieldInsn(Opcodes.PUTFIELD, Type.getInternalName(MappedByteBuffer.class),
            "fileDescriptor", Type.getDescriptor(FileDescriptor.class));

    // }
    settFileDescriptorMV.visitInsn(Opcodes.RETURN);
    settFileDescriptorMV.visitMaxs(0, 0);
    settFileDescriptorMV.visitEnd();

    // public FileDescriptor getFileDescriptor() {
    MethodVisitor getFileDescriptorMV = visitor.visitMethod(Opcodes.ACC_PUBLIC, "getFileDescriptor",
            Type.getMethodDescriptor(Type.getType(FileDescriptor.class)), null, null);
    getFileDescriptorMV.visitCode();

    // return getFileDescriptorImpl();
    // }
    getFileDescriptorMV.visitVarInsn(Opcodes.ALOAD, 0);
    getFileDescriptorMV.visitMethodInsn(Opcodes.INVOKESPECIAL, this.instrumentedTypeInternalName,
            "getFileDescriptorImpl", Type.getMethodDescriptor(Type.getType(FileDescriptor.class)), false);
    getFileDescriptorMV.visitInsn(Opcodes.ARETURN);
    getFileDescriptorMV.visitMaxs(0, 0);
    getFileDescriptorMV.visitEnd();

    // protected FileDescriptor getFileDescriptorImpl() {
    MethodVisitor getFileDescriptorImplMV = visitor.visitMethod(Opcodes.ACC_PROTECTED, "getFileDescriptorImpl",
            Type.getMethodDescriptor(Type.getType(FileDescriptor.class)), null, null);
    getFileDescriptorImplMV.visitCode();

    // return fileDescriptor;
    // }
    getFileDescriptorImplMV.visitVarInsn(Opcodes.ALOAD, 0);
    getFileDescriptorImplMV.visitFieldInsn(Opcodes.GETFIELD, Type.getInternalName(MappedByteBuffer.class),
            "fileDescriptor", Type.getDescriptor(FileDescriptor.class));
    getFileDescriptorImplMV.visitInsn(Opcodes.ARETURN);
    getFileDescriptorImplMV.visitMaxs(0, 0);
    getFileDescriptorImplMV.visitEnd();

    visitor.visitEnd();
}

From source file:de.zib.sfs.instrument.ZipFileAdapter.java

License:BSD License

@Override
public void visitEnd() {
    if (!this.skip.contains(OperationCategory.ZIP)) {
        // public void close() {
        MethodVisitor closeMethodMV = this.cv.visitMethod(Opcodes.ACC_PUBLIC, "close",
                Type.getMethodDescriptor(Type.VOID_TYPE), null,
                new String[] { Type.getInternalName(IOException.class) });
        closeMethodMV.visitCode();//from ww  w  .ja va  2 s  .c o m

        // ZipFileCallback.closeCallback(jzfile);
        closeMethodMV.visitVarInsn(Opcodes.ALOAD, 0);
        closeMethodMV.visitFieldInsn(Opcodes.GETFIELD, Type.getInternalName(ZipFile.class), "jzfile",
                Type.getDescriptor(Long.TYPE));
        closeMethodMV.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(ZipFileCallback.class),
                "closeCallback", Type.getMethodDescriptor(Type.VOID_TYPE, Type.LONG_TYPE), false);

        // methodPrefixclose();
        closeMethodMV.visitVarInsn(Opcodes.ALOAD, 0);
        closeMethodMV.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(ZipFile.class),
                this.methodPrefix + "close", Type.getMethodDescriptor(Type.VOID_TYPE), false);

        // }
        closeMethodMV.visitInsn(Opcodes.RETURN);
        closeMethodMV.visitMaxs(0, 0);
        closeMethodMV.visitEnd();
    }

    this.cv.visitEnd();
}

From source file:dodola.anole.lib.ConstructorDelegationDetector.java

License:Apache License

/**
 * Splits the constructor in two methods, the "set up" and the "body" parts (see above).
 *//*w w  w . j av a 2 s .co  m*/
private static Constructor split(String owner, MethodNode method, VarInsnNode loadThis,
        MethodInsnNode delegation, int loadThisLine) {
    String[] exceptions = ((List<String>) method.exceptions).toArray(new String[method.exceptions.size()]);
    String newDesc = method.desc.replaceAll("\\((.*)\\)V", "([Ljava/lang/Object;$1)Ljava/lang/Object;");

    MethodNode initArgs = new MethodNode(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, "init$args", newDesc, null,
            exceptions);
    AbstractInsnNode insn = loadThis.getNext();
    while (insn != delegation) {
        insn.accept(initArgs);
        insn = insn.getNext();
    }
    LabelNode labelBefore = new LabelNode();
    labelBefore.accept(initArgs);

    GeneratorAdapter mv = new GeneratorAdapter(initArgs, initArgs.access, initArgs.name, initArgs.desc);
    // Copy the arguments back to the argument array
    // The init_args part cannot access the "this" object and can have side effects on the
    // local variables. Because of this we use the first argument (which we want to keep
    // so all the other arguments remain unchanged) as a reference to the array where to
    // return the values of the modified local variables.
    Type[] types = Type.getArgumentTypes(initArgs.desc);
    int stack = 1; // Skip the first one which is a reference to the local array.
    for (int i = 1; i < types.length; i++) {
        Type type = types[i];
        // This is not this, but the array of local arguments final values.
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.push(i);
        mv.visitVarInsn(type.getOpcode(Opcodes.ILOAD), stack);
        mv.box(type);
        mv.arrayStore(Type.getType(Object.class));
        stack += type.getSize();
    }
    // Create the args array with the values to send to the delegated constructor
    Type[] returnTypes = Type.getArgumentTypes(delegation.desc);
    // The extra element for the qualified name of the constructor.
    mv.push(returnTypes.length + 1);
    mv.newArray(Type.getType(Object.class));
    int args = mv.newLocal(Type.getType("[Ljava/lang/Object;"));
    mv.storeLocal(args);
    for (int i = returnTypes.length - 1; i >= 0; i--) {
        Type type = returnTypes[i];
        mv.loadLocal(args);
        mv.swap(type, Type.getType(Object.class));
        mv.push(i + 1);
        mv.swap(type, Type.INT_TYPE);
        mv.box(type);
        mv.arrayStore(Type.getType(Object.class));
    }

    // Store the qualified name of the constructor in the first element of the array.
    mv.loadLocal(args);
    mv.push(0);
    mv.push(delegation.owner + "." + delegation.desc); // Name of the constructor to be called.
    mv.arrayStore(Type.getType(Object.class));

    mv.loadLocal(args);
    mv.returnValue();

    newDesc = method.desc.replace("(", "(L" + owner + ";");
    MethodNode body = new MethodNode(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, "init$body", newDesc, null,
            exceptions);
    LabelNode labelAfter = new LabelNode();
    labelAfter.accept(body);
    Set<LabelNode> bodyLabels = new HashSet<LabelNode>();

    insn = delegation.getNext();
    while (insn != null) {
        if (insn instanceof LabelNode) {
            bodyLabels.add((LabelNode) insn);
        }
        insn.accept(body);
        insn = insn.getNext();
    }

    // manually transfer the exception table from the existing constructor to the new
    // "init$body" method. The labels were transferred just above so we can reuse them.

    //noinspection unchecked
    for (TryCatchBlockNode tryCatch : (List<TryCatchBlockNode>) method.tryCatchBlocks) {
        tryCatch.accept(body);
    }

    //noinspection unchecked
    for (LocalVariableNode variable : (List<LocalVariableNode>) method.localVariables) {
        boolean startsInBody = bodyLabels.contains(variable.start);
        boolean endsInBody = bodyLabels.contains(variable.end);
        if (!startsInBody && !endsInBody) {
            if (variable.index != 0) { // '#0' on init$args is not 'this'
                variable.accept(initArgs);
            }
        } else if (startsInBody && endsInBody) {
            variable.accept(body);
        } else if (!startsInBody && endsInBody) {
            // The variable spans from the args to the end of the method, create two:
            if (variable.index != 0) { // '#0' on init$args is not 'this'
                LocalVariableNode var0 = new LocalVariableNode(variable.name, variable.desc, variable.signature,
                        variable.start, labelBefore, variable.index);
                var0.accept(initArgs);
            }
            LocalVariableNode var1 = new LocalVariableNode(variable.name, variable.desc, variable.signature,
                    labelAfter, variable.end, variable.index);
            var1.accept(body);
        } else {
            throw new IllegalStateException("Local variable starts after it ends.");
        }
    }

    return new Constructor(loadThis, loadThisLine, initArgs, delegation, body);
}

From source file:dodola.anole.lib.IncrementalChangeVisitor.java

License:Apache License

/**
 * To each class, add the dispatch method called by the original code that acts as a trampoline to
 * invoke the changed methods./*from  w  w  w  .  j  a va2  s.c  om*/
 * <p/>
 * Pseudo code:
 * <code>
 * Object access$dispatch(String name, object[] args) {
 * if (name.equals(
 * "firstMethod.(L$type;Ljava/lang/String;Ljava/lang/Object;)Ljava/lang/Object;")) {
 * return firstMethod(($type)arg[0], (String)arg[1], arg[2]);
 * }
 * if (name.equals("secondMethod.(L$type;Ljava/lang/String;I;)V")) {
 * secondMethod(($type)arg[0], (String)arg[1], (int)arg[2]);
 * return;
 * }
 * ...
 * StringBuilder $local1 = new StringBuilder();
 * $local1.append("Method not found ");
 * $local1.append(name);
 * $local1.append(" in " + visitedClassName +
 * "$dispatch implementation, restart the application");
 * throw new $package/InstantReloadException($local1.toString());
 * }
 * </code>
 */
private void addDispatchMethod() {
    int access = Opcodes.ACC_PUBLIC | Opcodes.ACC_VARARGS;
    Method m = new Method("access$dispatch", "(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/Object;");
    MethodVisitor visitor = super.visitMethod(access, m.getName(), m.getDescriptor(), null, null);

    final GeneratorAdapter mv = new GeneratorAdapter(access, m, visitor);

    if (TRACING_ENABLED) {
        mv.push("Redirecting ");
        mv.loadArg(0);
        trace(mv, 2);
    }

    List<MethodNode> allMethods = new ArrayList<MethodNode>();

    // if we are disabled, do not generate any dispatch, the method will throw an exception
    // if invoked which should never happen.
    if (!instantRunDisabled) {
        //noinspection unchecked
        allMethods.addAll(classNode.methods);
        allMethods.addAll(addedMethods);
    }

    final Map<String, MethodNode> methods = new HashMap<String, MethodNode>();
    for (MethodNode methodNode : allMethods) {
        if (methodNode.name.equals("<clinit>") || methodNode.name.equals("<init>")) {
            continue;
        }
        if (!isAccessCompatibleWithInstantRun(methodNode.access)) {
            continue;
        }
        methods.put(methodNode.name + "." + methodNode.desc, methodNode);
    }

    new StringSwitch() {
        @Override
        void visitString() {
            mv.visitVarInsn(Opcodes.ALOAD, 1);
        }

        @Override
        void visitCase(String methodName) {
            MethodNode methodNode = methods.get(methodName);
            String name = methodNode.name;
            boolean isStatic = (methodNode.access & Opcodes.ACC_STATIC) != 0;
            String newDesc = computeOverrideMethodDesc(methodNode.desc, isStatic);

            if (TRACING_ENABLED) {
                trace(mv, "M: " + name + " P:" + newDesc);
            }
            Type[] args = Type.getArgumentTypes(newDesc);
            int argc = 0;
            for (Type t : args) {
                mv.visitVarInsn(Opcodes.ALOAD, 2);
                mv.push(argc);
                mv.visitInsn(Opcodes.AALOAD);
                ByteCodeUtils.unbox(mv, t);
                argc++;
            }
            mv.visitMethodInsn(Opcodes.INVOKESTATIC, visitedClassName + "$override",
                    isStatic ? computeOverrideMethodName(name, methodNode.desc) : name, newDesc, false);
            Type ret = Type.getReturnType(methodNode.desc);
            if (ret.getSort() == Type.VOID) {
                mv.visitInsn(Opcodes.ACONST_NULL);
            } else {
                mv.box(ret);
            }
            mv.visitInsn(Opcodes.ARETURN);
        }

        @Override
        void visitDefault() {
            writeMissingMessageWithHash(mv, visitedClassName);
        }
    }.visit(mv, methods.keySet());

    mv.visitMaxs(0, 0);
    mv.visitEnd();

    super.visitEnd();
}

From source file:dodola.anole.lib.IncrementalSupportVisitor.java

License:Apache License

/***
 * Inserts a trampoline to this class so that the updated methods can make calls to super
 * class methods./* w w  w. j  a  v  a  2s  . c o m*/
 * <p/>
 * Pseudo code for this trampoline:
 * <code>
 * Object access$super($classType instance, String name, object[] args) {
 * switch(name) {
 * case "firstMethod.(Ljava/lang/String;Ljava/lang/Object;)Ljava/lang/Object;":
 * return super~instance.firstMethod((String)arg[0], arg[1]);
 * case "secondMethod.(Ljava/lang/String;I)V":
 * return super~instance.firstMethod((String)arg[0], arg[1]);
 * <p>
 * default:
 * StringBuilder $local1 = new StringBuilder();
 * $local1.append("Method not found ");
 * $local1.append(name);
 * $local1.append(" in " $classType $super implementation");
 * throw new $package/InstantReloadException($local1.toString());
 * }
 * </code>
 */
private void createAccessSuper() {
    int access = Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC | Opcodes.ACC_SYNTHETIC | Opcodes.ACC_VARARGS;
    Method m = new Method("access$super",
            "(L" + visitedClassName + ";Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/Object;");
    MethodVisitor visitor = super.visitMethod(access, m.getName(), m.getDescriptor(), null, null);

    final GeneratorAdapter mv = new GeneratorAdapter(access, m, visitor);

    // Gather all methods from itself and its superclasses to generate a giant access$super
    // implementation.
    // This will work fine as long as we don't support adding methods to a class.
    final Map<String, MethodReference> uniqueMethods = new HashMap<String, MethodReference>();
    if (parentNodes.isEmpty()) {
        // if we cannot determine the parents for this class, let's blindly add all the
        // method of the current class as a gateway to a possible parent version.
        addAllNewMethods(uniqueMethods, classNode);
    } else {
        // otherwise, use the parent list.
        for (ClassNode parentNode : parentNodes) {
            addAllNewMethods(uniqueMethods, parentNode);
        }
    }

    new StringSwitch() {
        @Override
        void visitString() {
            mv.visitVarInsn(Opcodes.ALOAD, 1);
        }

        @Override
        void visitCase(String methodName) {
            MethodReference methodRef = uniqueMethods.get(methodName);

            mv.visitVarInsn(Opcodes.ALOAD, 0);

            Type[] args = Type.getArgumentTypes(methodRef.method.desc);
            int argc = 0;
            for (Type t : args) {
                mv.visitVarInsn(Opcodes.ALOAD, 2);
                mv.push(argc);
                mv.visitInsn(Opcodes.AALOAD);
                ByteCodeUtils.unbox(mv, t);
                argc++;
            }

            if (TRACING_ENABLED) {
                trace(mv, "super selected ", methodRef.owner.name, methodRef.method.name,
                        methodRef.method.desc);
            }
            // Call super on the other object, yup this works cos we are on the right place to
            // call from.
            mv.visitMethodInsn(Opcodes.INVOKESPECIAL, methodRef.owner.name, methodRef.method.name,
                    methodRef.method.desc, false);

            Type ret = Type.getReturnType(methodRef.method.desc);
            if (ret.getSort() == Type.VOID) {
                mv.visitInsn(Opcodes.ACONST_NULL);
            } else {
                mv.box(ret);
            }
            mv.visitInsn(Opcodes.ARETURN);
        }

        @Override
        void visitDefault() {
            writeMissingMessageWithHash(mv, visitedClassName);
        }
    }.visit(mv, uniqueMethods.keySet());

    mv.visitMaxs(0, 0);
    mv.visitEnd();
}