Example usage for org.objectweb.asm MethodVisitor visitVarInsn

List of usage examples for org.objectweb.asm MethodVisitor visitVarInsn

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Introduction

In this page you can find the example usage for org.objectweb.asm MethodVisitor visitVarInsn.

Prototype

public void visitVarInsn(final int opcode, final int var)

Source Link

Document

Visits a local variable instruction.

Usage

From source file:com.mogujie.instantrun.SuperHelperVisitor.java

License:Apache License

public void start() {
    visit(Opcodes.V1_7, ACC_PUBLIC + ACC_SUPER, visitor.visitedClassName + "$helper", null,
            visitor.visitedSuperName, null);
    for (int nodeIndex = 0; nodeIndex < superNode.methods.size(); nodeIndex++) {
        MethodNode methodNode = (MethodNode) superNode.methods.get(nodeIndex);
        if ("<init>".equals(methodNode.name)) {
            String[] exceptions = null;
            if (methodNode.exceptions != null) {
                exceptions = (String[]) methodNode.exceptions.toArray(new String[0]);
            }// ww w .j ava2  s .  c om
            MethodVisitor mv = visitMethod(ACC_PUBLIC, methodNode.name, methodNode.desc, methodNode.signature,
                    exceptions);
            mv.visitCode();
            Type[] args = Type.getArgumentTypes(methodNode.desc);
            List<LocalVariable> variables = ByteCodeUtils.toLocalVariables(Arrays.asList(args));
            mv.visitVarInsn(ALOAD, 0);
            int local = 1;
            for (int i = 0; i < variables.size(); i++) {
                mv.visitVarInsn(variables.get(i).type.getOpcode(Opcodes.ILOAD), variables.get(i).var + 1);
                local = variables.get(i).var + 1 + variables.get(i).type.getSize();
            }
            mv.visitMethodInsn(INVOKESPECIAL, superNode.name, methodNode.name, methodNode.desc, false);
            mv.visitInsn(RETURN);
            mv.visitMaxs(local, local);
            mv.visitEnd();
        }
    }

    for (InstantMethod method : visitor.superMethods) {
        MethodVisitor mv = visitMethod(ACC_PUBLIC + ACC_STATIC, method.getName(), method.getDescriptor(), null,
                null);
        mv.visitCode();
        Type[] args = Type.getArgumentTypes(method.getDescriptor());

        List<LocalVariable> variables = ByteCodeUtils.toLocalVariables(Arrays.asList(args));
        int totSize = 1;
        for (LocalVariable variable : variables) {

            mv.visitVarInsn(variable.type.getOpcode(Opcodes.ILOAD), variable.var);
            totSize = variable.var;
        }

        mv.visitMethodInsn(INVOKESPECIAL, method.getOwner(), method.getName(), method.getOriDesc(), false);

        Type returnType = Type.getReturnType(method.getDescriptor());
        mv.visitInsn(returnType.getOpcode(Opcodes.IRETURN));
        mv.visitMaxs(totSize + 1, totSize + 1);
        mv.visitEnd();
    }

    visitEnd();
}

From source file:com.mto.asm.helloworld.ASMCodeGenerator.java

License:Open Source License

/**
 * Generate the byte code of a simple HelloWorld program
 *
 * public class HelloWorld//from w  ww .j  a  v  a  2s . com
 * {
 *    public void sayHello()
 *    {
 *       System.out.println("Hello World");
 *    }
 * }
 * @return
 */
public byte[] generateHelloWorld() {
    ClassWriter cw = new ClassWriter(0);
    MethodVisitor mv;

    cw.visit(V1_6, ACC_PUBLIC + ACC_SUPER, "com/mto/asm/helloworld/HelloWorld", null, "java/lang/Object", null);

    cw.visitSource("HelloWorld.java", null);

    mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
    mv.visitCode();
    Label l0 = new Label();
    mv.visitLabel(l0);
    mv.visitLineNumber(25, l0);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
    mv.visitInsn(RETURN);
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitLocalVariable("this", "Lcom/mto/asm/helloworld/HelloWorld;", null, l0, l1, 0);
    mv.visitMaxs(1, 1);
    mv.visitEnd();

    mv = cw.visitMethod(ACC_PUBLIC, "sayHello", "()V", null, null);
    mv.visitCode();
    l0 = new Label();
    mv.visitLabel(l0);
    mv.visitLineNumber(29, l0);
    mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
    mv.visitLdcInsn("Hello World");
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V");
    l1 = new Label();
    mv.visitLabel(l1);
    mv.visitLineNumber(30, l1);
    mv.visitInsn(RETURN);
    Label l2 = new Label();
    mv.visitLabel(l2);
    mv.visitLocalVariable("this", "Lcom/mto/asm/helloworld/HelloWorld;", null, l0, l2, 0);
    mv.visitMaxs(2, 1);
    mv.visitEnd();
    cw.visitEnd();

    return cw.toByteArray();
}

From source file:com.mulberry.athena.asm.ASMTest.java

License:Open Source License

@Test
public void generateClass() throws Exception {
    ClassWriter classWriter = new ClassWriter(0);
    ClassVisitor cv = new TraceClassVisitor(classWriter, new PrintWriter(System.out));
    //FieldVisitor fv;
    MethodVisitor mv;
    //AnnotationVisitor av0;

    cv.visit(V1_6, ACC_PUBLIC + ACC_SUPER, "Testing", null, "java/lang/Object", null);
    cv.visitSource("Testing.java", null);
    {//from  w  w w.ja v  a 2  s .c  o m
        mv = cv.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(1, l0);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        mv.visitInsn(RETURN);
        Label l1 = new Label();
        mv.visitLabel(l1);
        mv.visitLocalVariable("this", "LTesting;", null, l0, l1, 0);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    {
        mv = cv.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null);
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(3, l0);
        mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
        mv.visitLdcInsn("Works!");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V");
        Label l1 = new Label();
        mv.visitLabel(l1);
        mv.visitLineNumber(4, l1);
        mv.visitInsn(RETURN);
        Label l2 = new Label();
        mv.visitLabel(l2);
        mv.visitLocalVariable("args", "[Ljava/lang/String;", null, l0, l2, 0);
        mv.visitMaxs(2, 1);
        mv.visitEnd();
    }
    cv.visitEnd();

    Class<?> clazz = new DynamicClassLoader().defineClass("Testing", classWriter.toByteArray());
    java.lang.reflect.Method method = clazz.getMethod("main", String[].class);
    final String[] arguments = new String[] { "hello", "world" };
    method.invoke(clazz, (Object) arguments);
}

From source file:com.nginious.http.serialize.JsonDeserializerCreator.java

License:Apache License

/**
 * Creates a JSON deserializer for the specified bean class unless a deserializer has already
 * been created. Created deserializers are cached and returned on subsequent calls to this method.
 * /*from w  w  w  . j a v  a2 s .co m*/
 * @param <T> class type for bean
 * @param beanClazz bean class for which a deserializer should be created
 * @return the created deserializer
 * @throws SerializerFactoryException if unable to create deserializer or class is not a bean
 */
@SuppressWarnings("unchecked")
protected <T> JsonDeserializer<T> create(Class<T> beanClazz) throws SerializerFactoryException {
    JsonDeserializer<T> deserializer = (JsonDeserializer<T>) deserializers.get(beanClazz);

    if (deserializer != null) {
        return deserializer;
    }

    try {
        synchronized (this) {
            deserializer = (JsonDeserializer<T>) deserializers.get(beanClazz);

            if (deserializer != null) {
                return deserializer;
            }

            checkDeserializability(beanClazz, "json");
            String intBeanClazzName = Serialization.createInternalClassName(beanClazz);
            Method[] methods = beanClazz.getMethods();

            String intDeserializerClazzName = new StringBuffer(intBeanClazzName).append("JsonDeserializer")
                    .toString();

            // Create class
            ClassWriter writer = new ClassWriter(0);
            String signature = Serialization
                    .createClassSignature("com/nginious/http/serialize/JsonDeserializer", intBeanClazzName);
            writer.visit(Opcodes.V1_6, Opcodes.ACC_PUBLIC, intDeserializerClazzName, signature,
                    "com/nginious/http/serialize/JsonDeserializer", null);

            // Create constructor
            Serialization.createConstructor(writer, "com/nginious/http/serialize/JsonDeserializer");

            // Create deserialize method
            MethodVisitor visitor = createDeserializeMethod(writer, intBeanClazzName);

            for (Method method : methods) {
                Serializable info = method.getAnnotation(Serializable.class);
                boolean canDeserialize = info == null
                        || (info != null && info.deserialize() && info.types().indexOf("json") > -1);

                if (canDeserialize && method.getName().startsWith("set")
                        && method.getReturnType().equals(void.class)
                        && method.getParameterTypes().length == 1) {
                    Class<?>[] parameterTypes = method.getParameterTypes();
                    Class<?> parameterType = parameterTypes[0];

                    if (parameterType.isArray()) {
                        Class<?> arrayType = parameterType.getComponentType();

                        if (arrayType.equals(boolean.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeBooleanArray", "[Z", "[Z", intBeanClazzName, method.getName());
                        } else if (arrayType.equals(double.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeDoubleArray", "[D", "[D", intBeanClazzName, method.getName());
                        } else if (arrayType.equals(float.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeFloatArray", "[F", "[F", intBeanClazzName, method.getName());
                        } else if (arrayType.equals(int.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeIntArray", "[I", "[I", intBeanClazzName, method.getName());
                        } else if (arrayType.equals(long.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeLongArray", "[J", "[J", intBeanClazzName, method.getName());
                        } else if (arrayType.equals(short.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeShortArray", "[S", "[S", intBeanClazzName, method.getName());
                        } else if (arrayType.equals(String.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeStringArray", "[Ljava/lang/String;", "[Ljava/lang/String;",
                                    intBeanClazzName, method.getName());
                        }
                    } else if (parameterType.isPrimitive()) {
                        if (parameterType.equals(boolean.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeBoolean", "Z", "Z", intBeanClazzName, method.getName());
                        } else if (parameterType.equals(double.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeDouble", "D", "D", intBeanClazzName, method.getName());
                        } else if (parameterType.equals(float.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeFloat", "F", "F", intBeanClazzName, method.getName());
                        } else if (parameterType.equals(int.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeInt", "I", "I", intBeanClazzName, method.getName());
                        } else if (parameterType.equals(long.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeLong", "J", "J", intBeanClazzName, method.getName());
                        } else if (parameterType.equals(short.class)) {
                            createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                    "deserializeShort", "S", "S", intBeanClazzName, method.getName());
                        }
                    } else if (parameterType.equals(Calendar.class)) {
                        createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                "deserializeCalendar", "Ljava/util/Calendar;", "Ljava/util/Calendar;",
                                intBeanClazzName, method.getName());
                    } else if (parameterType.equals(Date.class)) {
                        createPropertyDeserializationCode(visitor, intDeserializerClazzName, "deserializeDate",
                                "Ljava/util/Date;", "Ljava/util/Date;", intBeanClazzName, method.getName());
                    } else if (parameterType.equals(String.class)) {
                        createPropertyDeserializationCode(visitor, intDeserializerClazzName,
                                "deserializeString", "Ljava/lang/String;", "Ljava/lang/String;",
                                intBeanClazzName, method.getName());
                    }
                }
            }

            visitor.visitVarInsn(Opcodes.ALOAD, 3);
            visitor.visitInsn(Opcodes.ARETURN);
            visitor.visitMaxs(5, 4);
            visitor.visitEnd();

            writer.visitEnd();
            byte[] clazzBytes = writer.toByteArray();
            ClassLoader controllerLoader = null;

            if (classLoader.hasLoaded(beanClazz)) {
                controllerLoader = beanClazz.getClassLoader();
            } else {
                controllerLoader = this.classLoader;
            }

            Class<?> clazz = Serialization.loadClass(controllerLoader,
                    intDeserializerClazzName.replace('/', '.'), clazzBytes);
            deserializer = (JsonDeserializer<T>) clazz.newInstance();
            deserializers.put(beanClazz, deserializer);
            return deserializer;
        }
    } catch (IllegalAccessException e) {
        throw new SerializerFactoryException(e);
    } catch (InstantiationException e) {
        throw new SerializerFactoryException(e);
    }
}

From source file:com.nginious.http.serialize.JsonDeserializerCreator.java

License:Apache License

/**
 * Creates bytecode for deserializing property matching the specified bean method name. The generated bytecode calls the
 * appropriate deserialization method in the class {@link JsonDeserializer} depending on the specified method type.
 * Then generated bytecode that calls the corresponding set method in the bean class. 
 * /*from w  w w.  j av  a 2 s  .com*/
 * @param visitor method visitor for writing bytecode
 * @param clazzName binary name of class being generated
 * @param methodName binary name of method in class {@link JsonDeserializer} used for deserializing property
 * @param methodType binary type of value returned by called deserialization method in {@link JsonDeserializer}
 * @param beanType binary type for argument in bean method for setting property
 * @param beanClazzName binary class name of bean for which the deserializer class is being generated
 * @param beanMethodName binary name of method in bean class for setting property
 */
private void createPropertyDeserializationCode(MethodVisitor visitor, String clazzName, String methodName,
        String methodType, String beanType, String beanClazzName, String beanMethodName) {
    String propertyName = Serialization.createPropertyNameFromMethodName(beanMethodName);
    visitor.visitVarInsn(Opcodes.ALOAD, 3);
    visitor.visitVarInsn(Opcodes.ALOAD, 0);
    visitor.visitVarInsn(Opcodes.ALOAD, 1);
    visitor.visitLdcInsn(propertyName);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, clazzName, methodName,
            "(Lorg/json/JSONObject;Ljava/lang/String;)" + methodType);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, beanClazzName, beanMethodName, "(" + beanType + ")V");
}

From source file:com.nginious.http.serialize.JsonDeserializerCreator.java

License:Apache License

/**
 * Creates bytecode which implements the {@link JsonDeserializer#deserialize(org.json.JSONObject)} method for
 * the deserializer class being created.
 * //from  w  w  w . ja va2 s  .co  m
 * @param writer class byte code writer
 * @param intBeanClazzName name of deserializer class being generated
 * @return a method visitor for writing bytecode inside the generated method
 */
private MethodVisitor createDeserializeMethod(ClassWriter writer, String intBeanClazzName) {
    String[] exceptions = { "com/nginious/serialize/SerializerException" };
    MethodVisitor visitor = writer.visitMethod(Opcodes.ACC_PUBLIC, "deserialize",
            "(Lorg/json/JSONObject;)Ljava/lang/Object;", null, exceptions);
    visitor.visitCode();

    visitor.visitTypeInsn(Opcodes.NEW, intBeanClazzName);
    visitor.visitInsn(Opcodes.DUP);
    visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, intBeanClazzName, "<init>", "()V");
    visitor.visitVarInsn(Opcodes.ASTORE, 3);
    return visitor;
}

From source file:com.nginious.http.serialize.JsonSerializerCreator.java

License:Apache License

/**
 * Creates bytecode for serializing a bean property which returns a collection of opaque objects.
 * //from   w ww .j  av a 2 s. co  m
 * @param visitor method visitor used for creating bytecode
 * @param returnType return type of get method in bean
 * @param intBeanClazzName binary name of bean
 * @param methodName binary name of get method in bean
 */
private void createObjectCollectionSerializationCode(MethodVisitor visitor, Class<?> returnType,
        String intBeanClazzName, String methodName, String propertyName) {
    visitor.visitTypeInsn(Opcodes.NEW, "com/nginious/http/serialize/JsonObjectCollectionSerializer");
    visitor.visitInsn(Opcodes.DUP);
    visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, "com/nginious/http/serialize/JsonObjectCollectionSerializer",
            "<init>", "()V");
    visitor.visitVarInsn(Opcodes.ASTORE, 4);

    visitor.visitVarInsn(Opcodes.ALOAD, 4);
    String intReturnClazzName = returnType.getName().replace('.', '/');
    visitor.visitVarInsn(Opcodes.ALOAD, 3);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, intBeanClazzName, methodName,
            "()L" + intReturnClazzName + ";");
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "com/nginious/http/serialize/JsonObjectCollectionSerializer",
            "serialize", "(Ljava/util/Collection;)Lorg/json/JSONArray;");
    visitor.visitVarInsn(Opcodes.ASTORE, 4);

    visitor.visitVarInsn(Opcodes.ALOAD, 1);
    visitor.visitLdcInsn(propertyName);
    visitor.visitVarInsn(Opcodes.ALOAD, 4);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "org/json/JSONObject", "put",
            "(Ljava/lang/String;Ljava/lang/Object;)Lorg/json/JSONObject;");
}

From source file:com.nginious.http.serialize.JsonSerializerCreator.java

License:Apache License

/**
 * Creates bytecode for serializing a bean property which returns a collection of beans that are serializable. Bean serializability
 * is determined as described in the class description.
 * //w ww  . j  a va 2  s.c o m
 * @param visitor method visitor used for creating bytecode
 * @param intBeanClazzName binary class name of bean
 * @param methodName binary name of get method in bean returning collection
 * @param returnType return type of get method in bean
 * @param collectionBeanType class of serializable bean found in collection
 */
private void createBeanCollectionSerializationCode(MethodVisitor visitor, String intBeanClazzName,
        String methodName, String propertyName, Class<?> returnType, Class<?> collectionBeanType) {
    visitor.visitVarInsn(Opcodes.ALOAD, 0);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "com/nginious/http/serialize/JsonSerializer",
            "getSerializerFactory", "()Lcom/nginious/http/serialize/SerializerFactoryImpl;");
    visitor.visitLdcInsn(collectionBeanType.getName());
    visitor.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Class", "forName",
            "(Ljava/lang/String;)Ljava/lang/Class;");
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "com/nginious/http/serialize/SerializerFactoryImpl",
            "createJsonSerializer", "(Ljava/lang/Class;)Lcom/nginious/http/serialize/JsonSerializer;");
    visitor.visitVarInsn(Opcodes.ASTORE, 4);

    visitor.visitTypeInsn(Opcodes.NEW, "com/nginious/http/serialize/JsonBeanCollectionSerializer");
    visitor.visitInsn(Opcodes.DUP);
    visitor.visitVarInsn(Opcodes.ALOAD, 4);
    visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, "com/nginious/http/serialize/JsonBeanCollectionSerializer",
            "<init>", "(Lcom/nginious/http/serialize/JsonSerializer;)V");
    visitor.visitVarInsn(Opcodes.ASTORE, 5);

    visitor.visitVarInsn(Opcodes.ALOAD, 5);
    String intReturnClazzName = returnType.getName().replace('.', '/');
    visitor.visitVarInsn(Opcodes.ALOAD, 3);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, intBeanClazzName, methodName,
            "()L" + intReturnClazzName + ";");
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "com/nginious/http/serialize/JsonBeanCollectionSerializer",
            "serialize", "(Ljava/util/Collection;)Lorg/json/JSONArray;");
    visitor.visitVarInsn(Opcodes.ASTORE, 5);

    visitor.visitVarInsn(Opcodes.ALOAD, 1);
    visitor.visitLdcInsn(propertyName);
    visitor.visitVarInsn(Opcodes.ALOAD, 5);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "org/json/JSONObject", "put",
            "(Ljava/lang/String;Ljava/lang/Object;)Lorg/json/JSONObject;");
}

From source file:com.nginious.http.serialize.JsonSerializerCreator.java

License:Apache License

/**
 * Creates bytecode for serializing a bean property which is in itself a serializable bean as defined in the class description.
 * /*from w w w .ja  v  a 2 s.c  om*/
 * @param visitor method visitor used for creating bytecode
 * @param returnMethodName binary name of get method in bean that returns serializable bean
 * @param returnType class of serializable bean
 * @param intBeanClazzName binary class name of bean
 */
private void createBeanSerializationCode(MethodVisitor visitor, String returnMethodName, String propertyName,
        Class<?> returnType, String intBeanClazzName) {
    String intReturnClazzName = Serialization.createInternalClassName(returnType);
    visitor.visitVarInsn(Opcodes.ALOAD, 0);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "com/nginious/http/serialize/JsonSerializer",
            "getSerializerFactory", "()Lcom/nginious/http/serialize/SerializerFactoryImpl;");
    visitor.visitLdcInsn(returnType.getName());
    visitor.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Class", "forName",
            "(Ljava/lang/String;)Ljava/lang/Class;");

    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "com/nginious/http/serialize/SerializerFactoryImpl",
            "createJsonSerializer", "(Ljava/lang/Class;)Lcom/nginious/http/serialize/JsonSerializer;");
    visitor.visitVarInsn(Opcodes.ASTORE, 4);

    visitor.visitVarInsn(Opcodes.ALOAD, 4);
    visitor.visitVarInsn(Opcodes.ALOAD, 3);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, intBeanClazzName, returnMethodName,
            "()L" + intReturnClazzName + ";");
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "com/nginious/http/serialize/JsonSerializer", "serialize",
            "(Ljava/lang/Object;)Lorg/json/JSONObject;");
    visitor.visitVarInsn(Opcodes.ASTORE, 4);

    visitor.visitVarInsn(Opcodes.ALOAD, 1);
    visitor.visitLdcInsn(propertyName);
    visitor.visitVarInsn(Opcodes.ALOAD, 4);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "org/json/JSONObject", "put",
            "(Ljava/lang/String;Ljava/lang/Object;)Lorg/json/JSONObject;");
}

From source file:com.nginious.http.serialize.JsonSerializerCreator.java

License:Apache License

/**
 * Creates bytecode for serializing property matching the specified bean method name. The generated bytecode calls the
 * appropriate serialization method in the class {@link JsonSerializer} depending on the specified method type.
 * //ww  w  .  java2s .  c o m
 * @param visitor method visitor for generating bytecode
 * @param clazzName binary name of serializer class being generated
 * @param methodName binary name of method in class {@link JsonSerializer} used for serializing property
 * @param methodType binary type for method in class {@link JsonSerializer} used for serializing property
 * @param beanType binary return type of get method in bean
 * @param beanClazzName binary name of bean class
 * @param beanMethodName binary name of get method in bean for getting method
 */
private void createPropertySerializationCode(MethodVisitor visitor, String clazzName, String methodName,
        String methodType, String beanType, String beanClazzName, String beanMethodName, String propertyName) {
    visitor.visitVarInsn(Opcodes.ALOAD, 0);
    visitor.visitVarInsn(Opcodes.ALOAD, 1);
    visitor.visitLdcInsn(propertyName);
    visitor.visitVarInsn(Opcodes.ALOAD, 3);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, beanClazzName, beanMethodName, "()" + beanType);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, clazzName, methodName,
            "(Lorg/json/JSONObject;Ljava/lang/String;" + methodType + ")V");
}