Examples with VarInsnNode org.apache.xbean.asm5.tree.VarInsnNode used on opensource projects

Example 1 with VarInsnNode

use of org.apache.xbean.asm5.tree.VarInsnNode in project apex-malhar by apache.

the class BeanClassGenerator method addHashCodeMethod.

/**
 * This will add a hashCode method for class being generated. <br>
 * Algorithm is as follows: <br>
 * <i><p>
 * int hashCode = 7;
 * for (field: all fields) {
 * hashCode = 23 * hashCode + field.hashCode()
 * }
 * </p></i>
 * <br>
 * <b> For primitive field, hashcode implemenented is similar to the one present in its wrapper class. </b>
 *
 * @param classNode
 * @param fieldList
 * @throws JSONException
 */
@SuppressWarnings("unchecked")
private static void addHashCodeMethod(ClassNode classNode, List<TupleSchemaRegistry.SQLFieldInfo> fieldList) throws JSONException {
    MethodNode hashCodeNode = new MethodNode(Opcodes.ACC_PUBLIC, "hashCode", "()I", null, null);
    hashCodeNode.visitAnnotation("Ljava/lang/Override;", true);
    hashCodeNode.instructions.add(new IntInsnNode(Opcodes.BIPUSH, 7));
    hashCodeNode.instructions.add(new VarInsnNode(Opcodes.ISTORE, 1));
    for (TupleSchemaRegistry.SQLFieldInfo fieldInfo : fieldList) {
        String fieldName = fieldInfo.getColumnName();
        String fieldType = fieldInfo.getType().getJavaType().getName();
        String fieldJavaType = getJavaType(fieldType);
        hashCodeNode.instructions.add(new IntInsnNode(Opcodes.BIPUSH, 23));
        hashCodeNode.instructions.add(new VarInsnNode(Opcodes.ILOAD, 1));
        hashCodeNode.instructions.add(new InsnNode(Opcodes.IMUL));
        hashCodeNode.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
        hashCodeNode.instructions.add(new FieldInsnNode(Opcodes.GETFIELD, classNode.name, fieldName, fieldJavaType));
        switch(fieldType) {
            case "boolean":
                LabelNode falseNode = new LabelNode();
                LabelNode trueNode = new LabelNode();
                hashCodeNode.instructions.add(new JumpInsnNode(Opcodes.IFEQ, falseNode));
                hashCodeNode.instructions.add(new IntInsnNode(Opcodes.SIPUSH, 1231));
                hashCodeNode.instructions.add(new JumpInsnNode(Opcodes.GOTO, trueNode));
                hashCodeNode.instructions.add(falseNode);
                hashCodeNode.instructions.add(new IntInsnNode(Opcodes.SIPUSH, 1237));
                hashCodeNode.instructions.add(trueNode);
                break;
            case "byte":
            case "char":
            case "short":
            case "int":
                break;
            case "float":
                hashCodeNode.instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC, "java/lang/Float", "floatToIntBits", "(F)I", false));
                break;
            case "long":
                hashCodeNode.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
                hashCodeNode.instructions.add(new FieldInsnNode(Opcodes.GETFIELD, classNode.name, fieldName, fieldJavaType));
                hashCodeNode.instructions.add(new IntInsnNode(Opcodes.BIPUSH, 32));
                hashCodeNode.instructions.add(new InsnNode(Opcodes.LUSHR));
                hashCodeNode.instructions.add(new InsnNode(Opcodes.LXOR));
                hashCodeNode.instructions.add(new InsnNode(Opcodes.L2I));
                break;
            case "double":
                hashCodeNode.instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC, "java/lang/Double", "doubleToLongBits", "(D)J", false));
                hashCodeNode.instructions.add(new InsnNode(Opcodes.DUP2));
                hashCodeNode.instructions.add(new VarInsnNode(Opcodes.LSTORE, 2));
                hashCodeNode.instructions.add(new VarInsnNode(Opcodes.LLOAD, 2));
                hashCodeNode.instructions.add(new IntInsnNode(Opcodes.BIPUSH, 32));
                hashCodeNode.instructions.add(new InsnNode(Opcodes.LUSHR));
                hashCodeNode.instructions.add(new InsnNode(Opcodes.LXOR));
                hashCodeNode.instructions.add(new InsnNode(Opcodes.L2I));
                break;
            default:
                String objectOwnerType = fieldType.replace('.', '/');
                LabelNode nullNode = new LabelNode();
                LabelNode continueNode = new LabelNode();
                hashCodeNode.instructions.add(new JumpInsnNode(Opcodes.IFNULL, nullNode));
                hashCodeNode.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
                hashCodeNode.instructions.add(new FieldInsnNode(Opcodes.GETFIELD, classNode.name, fieldName, fieldJavaType));
                hashCodeNode.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, objectOwnerType, "hashCode", "()I", false));
                hashCodeNode.instructions.add(new JumpInsnNode(Opcodes.GOTO, continueNode));
                hashCodeNode.instructions.add(nullNode);
                hashCodeNode.instructions.add(new InsnNode(Opcodes.ICONST_0));
                hashCodeNode.instructions.add(continueNode);
                break;
        }
        hashCodeNode.instructions.add(new InsnNode(Opcodes.IADD));
        hashCodeNode.instructions.add(new VarInsnNode(Opcodes.ISTORE, 1));
    }
    hashCodeNode.instructions.add(new VarInsnNode(Opcodes.ILOAD, 1));
    hashCodeNode.instructions.add(new InsnNode(Opcodes.IRETURN));
    classNode.methods.add(hashCodeNode);
}

Example 2 with VarInsnNode

use of org.apache.xbean.asm5.tree.VarInsnNode in project apex-malhar by apache.

the class BeanClassGenerator method addToStringMethod.

/**
 * Adds a toString method to underlying class. Uses StringBuilder to generate the final string.
 *
 * @param classNode
 * @param fieldList
 * @throws JSONException
 */
@SuppressWarnings("unchecked")
private static void addToStringMethod(ClassNode classNode, List<TupleSchemaRegistry.SQLFieldInfo> fieldList) throws JSONException {
    MethodNode toStringNode = new MethodNode(Opcodes.ACC_PUBLIC, "toString", "()Ljava/lang/String;", null, null);
    toStringNode.visitAnnotation("Ljava/lang/Override;", true);
    toStringNode.instructions.add(new TypeInsnNode(Opcodes.NEW, "java/lang/StringBuilder"));
    toStringNode.instructions.add(new InsnNode(Opcodes.DUP));
    toStringNode.instructions.add(new LdcInsnNode(classNode.name + "{"));
    toStringNode.instructions.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "(Ljava/lang/String;)V", false));
    toStringNode.instructions.add(new VarInsnNode(Opcodes.ASTORE, 1));
    toStringNode.instructions.add(new VarInsnNode(Opcodes.ALOAD, 1));
    for (int i = 0; i < fieldList.size(); i++) {
        TupleSchemaRegistry.SQLFieldInfo info = fieldList.get(i);
        String fieldName = info.getColumnName();
        String fieldType = info.getType().getJavaType().getName();
        String fieldJavaType = getJavaType(fieldType);
        if (i != 0) {
            toStringNode.instructions.add(new LdcInsnNode(", "));
            toStringNode.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false));
        }
        toStringNode.instructions.add(new LdcInsnNode(fieldName + "="));
        toStringNode.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false));
        toStringNode.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
        toStringNode.instructions.add(new FieldInsnNode(Opcodes.GETFIELD, classNode.name, fieldName, fieldJavaType));
        // There is no StringBuilder.append method for short and byte. It takes it as int.
        if (fieldJavaType.equals(Character.toString(typeIdentifierShort)) || fieldJavaType.equals(Character.toString(typeIdentifierByte))) {
            fieldJavaType = "I";
        }
        Character pchar = PRIMITIVE_TYPES.get(fieldType);
        if (pchar == null) {
            // It's not a primitive type. StringBuilder.append method signature takes Object type.
            fieldJavaType = "Ljava/lang/Object;";
        }
        toStringNode.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(" + fieldJavaType + ")Ljava/lang/StringBuilder;", false));
    }
    toStringNode.instructions.add(new LdcInsnNode("}"));
    toStringNode.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false));
    toStringNode.instructions.add(new InsnNode(Opcodes.POP));
    toStringNode.instructions.add(new VarInsnNode(Opcodes.ALOAD, 1));
    toStringNode.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false));
    toStringNode.instructions.add(new InsnNode(Opcodes.ARETURN));
    classNode.methods.add(toStringNode);
}

Example 3 with VarInsnNode

use of org.apache.xbean.asm5.tree.VarInsnNode in project apex-malhar by apache.

the class BeanClassGenerator method addSetter.

/**
 * Add public setter for given field
 * @param classNode ClassNode which needs to be populated with public setter
 * @param fieldName Name of the field for which setter needs to be added
 * @param fieldNameForMethods Suffix for setter method. Prefix "set" is added by this method
 * @param fieldJavaType Java ASM type of the field
 */
@SuppressWarnings("unchecked")
private static void addSetter(ClassNode classNode, String fieldName, String fieldNameForMethods, String fieldJavaType) {
    String setterSignature = '(' + fieldJavaType + ')' + 'V';
    MethodNode setterNode = new MethodNode(Opcodes.ACC_PUBLIC, "set" + fieldNameForMethods, setterSignature, null, null);
    setterNode.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    int loadOpCode;
    if (fieldJavaType.equals(Character.toString(typeIdentifierBoolean)) || fieldJavaType.equals(Character.toString(typeIdentifierByte)) || fieldJavaType.equals(Character.toString(typeIdentifierChar)) || fieldJavaType.equals(Character.toString(typeIdentifierShort)) || fieldJavaType.equals(Character.toString(typeIdentifierInt))) {
        loadOpCode = Opcodes.ILOAD;
    } else if (fieldJavaType.equals(Character.toString(typeIdentifierLong))) {
        loadOpCode = Opcodes.LLOAD;
    } else if (fieldJavaType.equals(Character.toString(typeIdentifierFloat))) {
        loadOpCode = Opcodes.FLOAD;
    } else if (fieldJavaType.equals(Character.toString(typeIdentifierDouble))) {
        loadOpCode = Opcodes.DLOAD;
    } else {
        loadOpCode = Opcodes.ALOAD;
    }
    setterNode.instructions.add(new VarInsnNode(loadOpCode, 1));
    setterNode.instructions.add(new FieldInsnNode(Opcodes.PUTFIELD, classNode.name, fieldName, fieldJavaType));
    setterNode.instructions.add(new InsnNode(Opcodes.RETURN));
    classNode.methods.add(setterNode);
}

Example 4 with VarInsnNode

use of org.apache.xbean.asm5.tree.VarInsnNode in project apex-malhar by apache.

the class BeanClassGenerator method addDateFields.

/**
 * Date field is explicitly handled and provided with 3 variants of types of same data.
 * 1. java.util.Date format
 * 2. long - Epoc time in ms
 * 3. int - Epoc time in sec rounded to date
 *
 * This is purposefully done because SQL operations on Date etc happens on long or int based on whether its a SQL DATE
 * field OR SQL TIMESTAMP field. Hence to cater to that 2 more variant of the same data is added to the POJO.
 */
@SuppressWarnings("unchecked")
private static void addDateFields(ClassNode classNode, String fieldName, String fieldNameForMethods, String type) {
    FieldNode fieldNodeSec = new FieldNode(Opcodes.ACC_PRIVATE, fieldName + "Sec", getJavaType("java.lang.Integer"), null, null);
    classNode.fields.add(fieldNodeSec);
    FieldNode fieldNodeMs = new FieldNode(Opcodes.ACC_PRIVATE, fieldName + "Ms", getJavaType("java.lang.Long"), null, null);
    classNode.fields.add(fieldNodeMs);
    // Create getter for Date
    MethodNode getterNodeDate = new MethodNode(Opcodes.ACC_PUBLIC, "get" + fieldNameForMethods, "()L" + type + ";", null, null);
    getterNodeDate.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    getterNodeDate.instructions.add(new FieldInsnNode(Opcodes.GETFIELD, classNode.name, fieldName, "L" + type + ";"));
    getterNodeDate.instructions.add(new InsnNode(Opcodes.ARETURN));
    classNode.methods.add(getterNodeDate);
    // Create getter for Sec
    MethodNode getterNodeSec = new MethodNode(Opcodes.ACC_PUBLIC, "get" + fieldNameForMethods + "Sec", "()Ljava/lang/Integer;", null, null);
    getterNodeSec.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    getterNodeSec.instructions.add(new FieldInsnNode(Opcodes.GETFIELD, classNode.name, fieldName + "Sec", "Ljava/lang/Integer;"));
    getterNodeSec.instructions.add(new InsnNode(Opcodes.ARETURN));
    classNode.methods.add(getterNodeSec);
    // Create getter for Ms
    MethodNode getterNodeMs = new MethodNode(Opcodes.ACC_PUBLIC, "get" + fieldNameForMethods + "Ms", "()Ljava/lang/Long;", null, null);
    getterNodeMs.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    getterNodeMs.instructions.add(new FieldInsnNode(Opcodes.GETFIELD, classNode.name, fieldName + "Ms", "Ljava/lang/Long;"));
    getterNodeMs.instructions.add(new InsnNode(Opcodes.ARETURN));
    classNode.methods.add(getterNodeMs);
    // Create setter for Date
    MethodNode setterNodeDate = new MethodNode(Opcodes.ACC_PUBLIC, "set" + fieldNameForMethods, "(L" + type + ";)V", null, null);
    setterNodeDate.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    setterNodeDate.instructions.add(new VarInsnNode(Opcodes.ALOAD, 1));
    setterNodeDate.instructions.add(new FieldInsnNode(Opcodes.PUTFIELD, classNode.name, fieldName, "L" + type + ";"));
    setterNodeDate.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    setterNodeDate.instructions.add(new VarInsnNode(Opcodes.ALOAD, 1));
    setterNodeDate.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, type, "getTime", "()J", false));
    setterNodeDate.instructions.add(new LdcInsnNode(new Long(1000)));
    setterNodeDate.instructions.add(new InsnNode(Opcodes.LDIV));
    setterNodeDate.instructions.add(new InsnNode(Opcodes.L2I));
    setterNodeDate.instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC, "java/lang/Integer", "valueOf", "(I)Ljava/lang/Integer;", false));
    setterNodeDate.instructions.add(new FieldInsnNode(Opcodes.PUTFIELD, classNode.name, fieldName + "Sec", "Ljava/lang/Integer;"));
    setterNodeDate.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    setterNodeDate.instructions.add(new VarInsnNode(Opcodes.ALOAD, 1));
    setterNodeDate.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, type, "getTime", "()J", false));
    setterNodeDate.instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC, "java/lang/Long", "valueOf", "(J)Ljava/lang/Long;", false));
    setterNodeDate.instructions.add(new FieldInsnNode(Opcodes.PUTFIELD, classNode.name, fieldName + "Ms", "Ljava/lang/Long;"));
    setterNodeDate.instructions.add(new InsnNode(Opcodes.RETURN));
    classNode.methods.add(setterNodeDate);
    // Create setter for Sec
    MethodNode setterNodeSec = new MethodNode(Opcodes.ACC_PUBLIC, "set" + fieldNameForMethods + "Sec", "(Ljava/lang/Integer;)V", null, null);
    setterNodeSec.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    setterNodeSec.instructions.add(new TypeInsnNode(Opcodes.NEW, type));
    setterNodeSec.instructions.add(new InsnNode(Opcodes.DUP));
    setterNodeSec.instructions.add(new VarInsnNode(Opcodes.ALOAD, 1));
    setterNodeSec.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, "java/lang/Integer", "intValue", "()I", false));
    setterNodeSec.instructions.add(new InsnNode(Opcodes.I2L));
    setterNodeSec.instructions.add(new LdcInsnNode(new Long(1000)));
    setterNodeSec.instructions.add(new InsnNode(Opcodes.LMUL));
    setterNodeSec.instructions.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, "java/util/Date", "<init>", "(J)V", false));
    setterNodeSec.instructions.add(new FieldInsnNode(Opcodes.PUTFIELD, classNode.name, fieldName, "L" + type + ";"));
    setterNodeSec.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    setterNodeSec.instructions.add(new VarInsnNode(Opcodes.ALOAD, 1));
    setterNodeSec.instructions.add(new FieldInsnNode(Opcodes.PUTFIELD, classNode.name, fieldName + "Sec", "Ljava/lang/Integer;"));
    setterNodeSec.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    setterNodeSec.instructions.add(new TypeInsnNode(Opcodes.NEW, "java/lang/Long"));
    setterNodeSec.instructions.add(new InsnNode(Opcodes.DUP));
    setterNodeSec.instructions.add(new VarInsnNode(Opcodes.ALOAD, 1));
    setterNodeSec.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, "java/lang/Integer", "intValue", "()I", false));
    setterNodeSec.instructions.add(new InsnNode(Opcodes.I2L));
    setterNodeSec.instructions.add(new LdcInsnNode(new Long(1000)));
    setterNodeSec.instructions.add(new InsnNode(Opcodes.LMUL));
    setterNodeSec.instructions.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, "java/lang/Long", "<init>", "(J)V", false));
    setterNodeSec.instructions.add(new FieldInsnNode(Opcodes.PUTFIELD, classNode.name, fieldName + "Ms", "Ljava/lang/Long;"));
    setterNodeSec.instructions.add(new InsnNode(Opcodes.RETURN));
    classNode.methods.add(setterNodeSec);
    // Create setter for Ms
    MethodNode setterNodeMs = new MethodNode(Opcodes.ACC_PUBLIC, "set" + fieldNameForMethods + "Ms", "(Ljava/lang/Long;)V", null, null);
    setterNodeMs.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    setterNodeMs.instructions.add(new TypeInsnNode(Opcodes.NEW, type));
    setterNodeMs.instructions.add(new InsnNode(Opcodes.DUP));
    setterNodeMs.instructions.add(new VarInsnNode(Opcodes.ALOAD, 1));
    setterNodeMs.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, "java/lang/Long", "longValue", "()J", false));
    setterNodeMs.instructions.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, "java/util/Date", "<init>", "(J)V", false));
    setterNodeMs.instructions.add(new FieldInsnNode(Opcodes.PUTFIELD, classNode.name, fieldName, "L" + type + ";"));
    setterNodeMs.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    setterNodeMs.instructions.add(new TypeInsnNode(Opcodes.NEW, "java/lang/Integer"));
    setterNodeMs.instructions.add(new InsnNode(Opcodes.DUP));
    setterNodeMs.instructions.add(new VarInsnNode(Opcodes.ALOAD, 1));
    setterNodeMs.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, "java/lang/Long", "longValue", "()J", false));
    setterNodeMs.instructions.add(new LdcInsnNode(new Long(1000)));
    setterNodeMs.instructions.add(new InsnNode(Opcodes.LDIV));
    setterNodeMs.instructions.add(new InsnNode(Opcodes.L2I));
    setterNodeMs.instructions.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, "java/lang/Integer", "<init>", "(I)V", false));
    setterNodeMs.instructions.add(new FieldInsnNode(Opcodes.PUTFIELD, classNode.name, fieldName + "Sec", "Ljava/lang/Integer;"));
    setterNodeMs.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    setterNodeMs.instructions.add(new VarInsnNode(Opcodes.ALOAD, 1));
    setterNodeMs.instructions.add(new FieldInsnNode(Opcodes.PUTFIELD, classNode.name, fieldName + "Ms", "Ljava/lang/Long;"));
    setterNodeMs.instructions.add(new InsnNode(Opcodes.RETURN));
    classNode.methods.add(setterNodeMs);
}

Example 5 with VarInsnNode

use of org.apache.xbean.asm5.tree.VarInsnNode in project apex-malhar by apache.

the class BeanClassGenerator method addGetter.

/**
 * Add public getter method for given field
 * @param classNode ClassNode which needs to be populated with public getter.
 * @param fieldName Name of the field for which public getter needs to be added.
 * @param fieldNameForMethods Suffix of the getter method, Prefix "is" or "get" is added by this method.
 * @param fieldJavaType Java ASM type of the field
 */
@SuppressWarnings("unchecked")
private static void addGetter(ClassNode classNode, String fieldName, String fieldNameForMethods, String fieldJavaType) {
    String getterSignature = "()" + fieldJavaType;
    MethodNode getterNode = new MethodNode(Opcodes.ACC_PUBLIC, (fieldJavaType.equals(typeIdentifierBoolean) ? "is" : "get") + fieldNameForMethods, getterSignature, null, null);
    getterNode.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    getterNode.instructions.add(new FieldInsnNode(Opcodes.GETFIELD, classNode.name, fieldName, fieldJavaType));
    int returnOpCode;
    if (fieldJavaType.equals(Character.toString(typeIdentifierBoolean)) || fieldJavaType.equals(Character.toString(typeIdentifierByte)) || fieldJavaType.equals(Character.toString(typeIdentifierChar)) || fieldJavaType.equals(Character.toString(typeIdentifierShort)) || fieldJavaType.equals(Character.toString(typeIdentifierInt))) {
        returnOpCode = Opcodes.IRETURN;
    } else if (fieldJavaType.equals(Character.toString(typeIdentifierLong))) {
        returnOpCode = Opcodes.LRETURN;
    } else if (fieldJavaType.equals(Character.toString(typeIdentifierFloat))) {
        returnOpCode = Opcodes.FRETURN;
    } else if (fieldJavaType.equals(Character.toString(typeIdentifierDouble))) {
        returnOpCode = Opcodes.DRETURN;
    } else {
        returnOpCode = Opcodes.ARETURN;
    }
    getterNode.instructions.add(new InsnNode(returnOpCode));
    classNode.methods.add(getterNode);
}