Examples of com.alibaba.fastjson.asm.Label

com.alibaba.fastjson.asm.Label
A label represents a position in the bytecode of a method. Labels are used for jump, goto, and switch instructions, and for try catch blocks. A label designates the instruction that is just after. Note however that there can be other elements between a label and the instruction it designates (such as other labels, stack map frames, line numbers, etc.). @author Eric Bruneton

    }


    private void _writeObject(MethodVisitor mw, FieldInfo fieldInfo, Context context, Label _end) {
        String format = fieldInfo.getFormat();


        Label _not_null = new Label();


        mw.visitVarInsn(ALOAD, context.processValue());
        mw.visitJumpInsn(IFNONNULL, _not_null); // if (obj == null)
        _if_write_null(mw, fieldInfo, context);
        mw.visitJumpInsn(GOTO, _end);

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    }


    private void _if_write_null(MethodVisitor mw, FieldInfo fieldInfo, Context context) {
        Class<?> propertyClass = fieldInfo.getFieldClass();


        Label _if = new Label();
        Label _else = new Label();
        Label _write_null = new Label();
        Label _end_if = new Label();


        mw.visitLabel(_if);


        // out.isEnabled(Serializer.WriteMapNullValue)
        boolean writeNull = false;

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            mw.visitVarInsn(ASTORE, context.var("out"));


            JSONType jsonType = clazz.getAnnotation(JSONType.class);


            if (jsonType == null || jsonType.alphabetic()) {
                Label _else = new Label();


                mw.visitVarInsn(ALOAD, context.var("out"));
                mw.visitFieldInsn(GETSTATIC, getType(SerializerFeature.class), "SortField",
                                  "L" + getType(SerializerFeature.class) + ";");
                mw.visitMethodInsn(INVOKEVIRTUAL, getType(SerializeWriter.class), "isEnabled",

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        return (ObjectSerializer) instance;
    }


    private void generateWriteMethod(Class<?> clazz, MethodVisitor mw, List<FieldInfo> getters, Context context)
                                                                                                                throws Exception {
        Label end = new Label();


        int size = getters.size();


        {
            // 格式化输出不走asm 优化
            Label endFormat_ = new Label();
            Label notNull_ = new Label();
            mw.visitVarInsn(ALOAD, context.var("out"));
            mw.visitFieldInsn(GETSTATIC, getType(SerializerFeature.class), "PrettyFormat",
                              "L" + getType(SerializerFeature.class) + ";");
            mw.visitMethodInsn(INVOKEVIRTUAL, getType(SerializeWriter.class), "isEnabled",
                               "(" + "L" + getType(SerializerFeature.class) + ";" + ")Z");
            mw.visitJumpInsn(IFEQ, endFormat_);


            mw.visitVarInsn(ALOAD, 0);
            mw.visitFieldInsn(GETFIELD, context.getClassName(), "nature", getDesc(JavaBeanSerializer.class));
            mw.visitJumpInsn(IFNONNULL, notNull_);


            initNature(clazz, mw, context);


            // /////
            mw.visitLabel(notNull_);


            mw.visitVarInsn(ALOAD, 0);
            mw.visitFieldInsn(GETFIELD, context.getClassName(), "nature", getDesc(JavaBeanSerializer.class));
            mw.visitVarInsn(ALOAD, 1);
            mw.visitVarInsn(ALOAD, 2);
            mw.visitVarInsn(ALOAD, 3);
            mw.visitVarInsn(ALOAD, 4);
            mw.visitMethodInsn(INVOKEVIRTUAL, getType(JavaBeanSerializer.class), "write",
                               "(Lcom/alibaba/fastjson/serializer/JSONSerializer;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/reflect/Type;)V");
            mw.visitInsn(RETURN);


            mw.visitLabel(endFormat_);
        }


        {
            // if (serializer.containsReference(object)) {


            Label endRef_ = new Label();
            Label notNull_ = new Label();


            mw.visitVarInsn(ALOAD, context.serializer());
            mw.visitVarInsn(ALOAD, context.obj());
            mw.visitMethodInsn(INVOKEVIRTUAL, getType(JSONSerializer.class), "containsReference",
                               "(Ljava/lang/Object;)Z");
            mw.visitJumpInsn(IFEQ, endRef_);


            mw.visitVarInsn(ALOAD, 0);
            mw.visitFieldInsn(GETFIELD, context.getClassName(), "nature", getDesc(JavaBeanSerializer.class));
            mw.visitJumpInsn(IFNONNULL, notNull_);


            initNature(clazz, mw, context);


            // /////
            mw.visitLabel(notNull_);
            mw.visitVarInsn(ALOAD, 0);
            mw.visitFieldInsn(GETFIELD, context.getClassName(), "nature", getDesc(JavaBeanSerializer.class));
            mw.visitVarInsn(ALOAD, 1);
            mw.visitVarInsn(ALOAD, 2);
            mw.visitMethodInsn(INVOKEVIRTUAL, getType(JavaBeanSerializer.class), "writeReference",
                               "(Lcom/alibaba/fastjson/serializer/JSONSerializer;Ljava/lang/Object;)V");


            mw.visitInsn(RETURN);


            mw.visitLabel(endRef_);
        }


        {
            mw.visitVarInsn(ALOAD, context.serializer());
            mw.visitMethodInsn(INVOKEVIRTUAL, getType(JSONSerializer.class), "getContext",
                               "()Lcom/alibaba/fastjson/serializer/SerialContext;");
            mw.visitVarInsn(ASTORE, context.var("parent"));


            mw.visitVarInsn(ALOAD, context.serializer());
            mw.visitVarInsn(ALOAD, context.var("parent"));
            mw.visitVarInsn(ALOAD, context.obj());
            mw.visitVarInsn(ALOAD, context.paramFieldName());
            mw.visitMethodInsn(INVOKEVIRTUAL, getType(JSONSerializer.class), "setContext",
                               "(Lcom/alibaba/fastjson/serializer/SerialContext;Ljava/lang/Object;Ljava/lang/Object;)V");
        }


        // SEPERATO
        {
            Label end_ = new Label();
            Label else_ = new Label();
            Label writeClass_ = new Label();


            // mw.visitVarInsn(ALOAD, context.var("out"));
            // mw.visitFieldInsn(GETSTATIC, getType(SerializerFeature.class), "WriteClassName",
            // "L" + getType(SerializerFeature.class) + ";");
            // mw.visitMethodInsn(INVOKEVIRTUAL, getType(SerializeWriter.class), "isEnabled",
            // "(" + "L" + getType(SerializerFeature.class) + ";" + ")Z");
            // mw.visitJumpInsn(IFEQ, else_);


            mw.visitVarInsn(ALOAD, context.serializer());
            mw.visitVarInsn(ALOAD, context.paramFieldType());
            mw.visitVarInsn(ALOAD, context.obj());
            mw.visitMethodInsn(INVOKEVIRTUAL, getType(JSONSerializer.class), "isWriteClassName",
                               "(Ljava/lang/reflect/Type;Ljava/lang/Object;)Z");
            mw.visitJumpInsn(IFEQ, else_);


            // mw.visitVarInsn(ALOAD, context.paramFieldType());
            // mw.visitJumpInsn(IFNULL, writeClass_);


            // IFNULL
            mw.visitVarInsn(ALOAD, context.paramFieldType());
            mw.visitVarInsn(ALOAD, context.obj());
            mw.visitMethodInsn(INVOKEVIRTUAL, getType(Object.class), "getClass", "()Ljava/lang/Class;");
            mw.visitJumpInsn(IF_ACMPEQ, else_);


            mw.visitLabel(writeClass_);
            mw.visitVarInsn(ALOAD, context.var("out"));
            mw.visitLdcInsn("{\"@type\":\"" + clazz.getName() + "\"");
            mw.visitMethodInsn(INVOKEVIRTUAL, getType(SerializeWriter.class), "write", "(Ljava/lang/String;)V");
            mw.visitVarInsn(BIPUSH, ',');
            mw.visitJumpInsn(GOTO, end_);


            mw.visitLabel(else_);
            mw.visitVarInsn(BIPUSH, '{');


            mw.visitLabel(end_);
        }


        mw.visitVarInsn(ISTORE, context.var("seperator"));


        for (int i = 0; i < size; ++i) {
            FieldInfo property = getters.get(i);
            Class<?> propertyClass = property.getFieldClass();


            mw.visitLdcInsn(property.getName());
            mw.visitVarInsn(ASTORE, context.fieldName());


            if (propertyClass == byte.class) {
                _byte(clazz, mw, property, context);
            } else if (propertyClass == short.class) {
                _short(clazz, mw, property, context);
            } else if (propertyClass == int.class) {
                _int(clazz, mw, property, context);
            } else if (propertyClass == long.class) {
                _long(clazz, mw, property, context);
            } else if (propertyClass == float.class) {
                _float(clazz, mw, property, context);
            } else if (propertyClass == double.class) {
                _double(clazz, mw, property, context);
            } else if (propertyClass == boolean.class) {
                _boolean(clazz, mw, property, context);
            } else if (propertyClass == char.class) {
                _char(clazz, mw, property, context);
            } else if (propertyClass == String.class) {
                _string(clazz, mw, property, context);
            } else if (propertyClass == BigDecimal.class) {
                _decimal(clazz, mw, property, context);
            } else if (List.class.isAssignableFrom(propertyClass)) {
                _list(clazz, mw, property, context);
                // _object(clazz, mw, property, context);
            } else if (propertyClass.isEnum()) {
                _enum(clazz, mw, property, context);
            } else {
                _object(clazz, mw, property, context);
            }
        }


        Label _if = new Label();
        Label _else = new Label();
        Label _end_if = new Label();


        mw.visitLabel(_if);


        // if (seperator == '{')
        mw.visitVarInsn(ILOAD, context.var("seperator"));

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                                                                                       + ")V");
        mw.visitFieldInsn(PUTFIELD, context.getClassName(), "nature", getDesc(JavaBeanSerializer.class));
    }


    private void _object(Class<?> clazz, MethodVisitor mw, FieldInfo property, Context context) {
        Label _end = new Label();


        _nameApply(mw, property, context, _end);
        _get(mw, context, property);
        mw.visitVarInsn(ASTORE, context.var("object"));

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                    writeEnumUsingToString = true;
                }
            }
        }


        Label _not_null = new Label();
        Label _end_if = new Label();
        Label _end = new Label();


        _nameApply(mw, property, context, _end);
        _get(mw, context, property);
        mw.visitTypeInsn(CHECKCAST, getType(Enum.class)); // cast
        mw.visitVarInsn(ASTORE, context.var("enum"));

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        mw.visitLabel(_end);
    }


    private void _long(Class<?> clazz, MethodVisitor mw, FieldInfo property, Context context) {
        Label _end = new Label();


        _nameApply(mw, property, context, _end);
        _get(mw, context, property);
        mw.visitVarInsn(LSTORE, context.var("long", 2));

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        mw.visitLabel(_end);
    }


    private void _float(Class<?> clazz, MethodVisitor mw, FieldInfo property, Context context) {
        Label _end = new Label();


        _nameApply(mw, property, context, _end);
        _get(mw, context, property);
        mw.visitVarInsn(FSTORE, context.var("float"));

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        mw.visitLabel(_end);
    }


    private void _double(Class<?> clazz, MethodVisitor mw, FieldInfo property, Context context) {
        Label _end = new Label();


        _nameApply(mw, property, context, _end);
        _get(mw, context, property);
        mw.visitVarInsn(DSTORE, context.var("double", 2));

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        mw.visitLabel(_end);
    }


    private void _char(Class<?> clazz, MethodVisitor mw, FieldInfo property, Context context) {
        Label _end = new Label();


        _nameApply(mw, property, context, _end);
        _get(mw, context, property);
        mw.visitVarInsn(ISTORE, context.var("char"));

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