org.objectweb.asm.MethodVisitor java code examples

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Common ways to obtain MethodVisitor

private void myMethod () {
 MethodVisitor m =ClassVisitor zuper;zuper.visitMethod(access, name, desc, signature, exceptions)
ClassVisitor cv;String name;String desc;String signature;String[] exceptions;cv.visitMethod(access, name, desc, signature, exceptions)
ClassVisitor cv;cv.visitMethod(access, "<init>", "()V", null, null)
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}

@Override
public void visitMaxs(int maxStack, int maxLocals) {
  Label endFinally = new Label();
  mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
  mv.visitLabel(endFinally);
  mv.visitInsn(DUP);
  int errIdx = newLocal(Type.getType(Throwable.class));
  mv.visitVarInsn(Opcodes.ASTORE, errIdx);
  mv.visitVarInsn(Opcodes.ALOAD, statIdx);
  mv.visitVarInsn(Opcodes.ALOAD, errIdx);
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_MAIN, END_METHOD, END_SIGNATURE, false);
  mv.visitInsn(ATHROW);
  mv.visitMaxs(maxStack + 8, maxLocals + 2);
}

private void genSwitchMethod(ClassVisitor cw, String typeName, String methodName, CB callback) {
  MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, methodName, "()Ljava/lang/String;", null, null);
  mv.visitCode();
  mv.visitVarInsn(ALOAD, 0);
  mv.visitFieldInsn(GETFIELD, typeName, "idx", "I");
  Label def = new Label();
  Label[] labels = new Label[callbacks.size()];
    Label label = strMap.get(key);
    if (label == null) {
      label = new Label();
      strMap.put(key, label);
  mv.visitTableSwitchInsn(0, callbacks.size() - 1, def, labels);
    mv.visitLabel(e.getValue());
    mv.visitLdcInsn(e.getKey());
    mv.visitInsn(ARETURN);
  mv.visitLabel(def);
  mv.visitTypeInsn(NEW, "java/lang/RuntimeException");
  mv.visitInsn(DUP);
  mv.visitLdcInsn("invalid idx");
  mv.visitMethodInsn(INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V");
  mv.visitInsn(ATHROW);
  mv.visitMaxs(-1, -1);
  mv.visitEnd();

private static void createFloatObj(MethodVisitor mv, int argsPostion) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/Float");
  mv.visitInsn(Opcodes.DUP);
  mv.visitVarInsn(Opcodes.FLOAD, argsPostion);
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Float", "<init>", "(F)V");
  mv.visitInsn(Opcodes.AASTORE);
}

private void visitMethodStub(MethodVisitor mv) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/RuntimeException");
  mv.visitInsn(Opcodes.DUP);
  mv.visitLdcInsn("Stub!");
  String owner = "java/lang/RuntimeException";
  String name = "<init>";
  String desc = "(Ljava/lang/String;)V";
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, owner, name, desc, false);
  mv.visitInsn(Opcodes.ATHROW);
}

private void visitCallObjectHashCode(MethodVisitor mv) {
  mv.visitVarInsn(Opcodes.ALOAD, 0);
  String owner = "java/lang/Object";
  String name = "hashCode";
  String desc = "()I";
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, owner, name, desc, false);
  mv.visitInsn(Opcodes.IRETURN);
}

mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, superClassNameInternal, "<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
mv.visitCode();
  mv.visitVarInsn(ALOAD, 1);
  mv.visitTypeInsn(CHECKCAST, classNameInternal);
  mv.visitVarInsn(ASTORE, 4);
  mv.visitVarInsn(ILOAD, 2);
  Label[] labels = new Label[n];
  for (int i = 0; i < n; i++) {
    labels[i] = new Label();
  Label defaultLabel = new Label(); // the default handler block
  mv.visitTableSwitchInsn(0, labels.length - 1, defaultLabel, labels);
    mv.visitLabel(labels[i]);
    if (i == 0) {
      mv.visitFrame(Opcodes.F_APPEND, 1, new Object[] { classNameInternal }, 0, null);
    } else {
      mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitVarInsn(ALOAD, 4);

@RequiresNonNull({"type", "metaHolderInternalName", "loader"})
private void generateMetaHolder() throws Exception {
  ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
  cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, metaHolderInternalName, null, "java/lang/Object",
      null);
  Type metaHolderType = Type.getObjectType(metaHolderInternalName);
  MethodVisitor mv = cw.visitMethod(ACC_STATIC, "<clinit>", "()V", null, null);
  mv.visitCode();
  Label l0 = new Label();
  Label l1 = new Label();
  Label l2 = new Label();
  mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Throwable");
  mv.visitLabel(l0);
  for (Type classMetaType : classMetaTypes) {
    String classMetaInternalName = classMetaType.getInternalName();
    String classMetaFieldName =
        "glowroot$class$meta$" + classMetaInternalName.replace('/', '$');
        "L" + classMetaInternalName + ";", null, null);
    fv.visitEnd();
    mv.visitTypeInsn(NEW, classMetaInternalName);
    mv.visitInsn(DUP);
    mv.visitTypeInsn(NEW, classInfoImplType.getInternalName());
    mv.visitInsn(DUP);
    mv.visitLdcInsn(type.getClassName());
    mv.visitLdcInsn(metaHolderType);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getClassLoader",
        "()Ljava/lang/ClassLoader;", false);
    mv.visitMethodInsn(INVOKESPECIAL, classInfoImplType.getInternalName(), "<init>",
        "(Ljava/lang/String;Ljava/lang/ClassLoader;)V", false);

MethodVisitor methodVisitor = classVisitor.visitMethod(Opcodes.ACC_PUBLIC,
    "process",
    methodDescriptor(int.class, iFace, int.class),
    null,
    null);
methodVisitor.visitCode();
Label localScopeStart = new Label();
methodVisitor.visitLabel(localScopeStart);
methodVisitor.visitInsn(Opcodes.ICONST_0);
methodVisitor.visitVarInsn(Opcodes.ISTORE, localIndexOfLoopIndex);
Label loopStart = new Label(), loopEnd = new Label();
methodVisitor.visitLabel(loopStart);
methodVisitor.visitVarInsn(Opcodes.ILOAD, localIndexOfLoopIndex);
methodVisitor.visitVarInsn(Opcodes.ILOAD, localIndexOfLimit);
methodVisitor.visitJumpInsn(Opcodes.IF_ICMPGE, loopEnd);
methodVisitor.visitVarInsn(Opcodes.LSTORE, localIndexOfROffset);
methodVisitor.visitVarInsn(Opcodes.LLOAD, localIndexOfROffset);
methodVisitor.visitLdcInsn(ProxyChannelRingBuffer.EOF);
methodVisitor.visitInsn(Opcodes.LCMP);
methodVisitor.visitJumpInsn(Opcodes.IFEQ, loopEnd);
methodVisitor.visitVarInsn(Opcodes.ISTORE, localIndexOfTypeId);
methodVisitor.visitVarInsn(Opcodes.ILOAD, localIndexOfTypeId);

@Override
public void visitCode() {
  mv.visitVarInsn(ALOAD, 0);
  mv.visitFieldInsn(GETFIELD, ownerClass, "producerConfig", "Lorg/apache/kafka/clients/producer/ProducerConfig;");
  mv.visitVarInsn(ALOAD, 1);
  mv.visitMethodInsn(INVOKEVIRTUAL, "org/apache/kafka/clients/producer/ProducerRecord", "topic", "()Ljava/lang/String;", false);
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_KAFKA, START_METHOD, START_SIGNATURE, false);
  statIdx = newLocal(Type.getType(Object.class));
  mv.visitVarInsn(Opcodes.ASTORE, statIdx);
  mv.visitLabel(startFinally);
  mv.visitCode();
}

mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitFieldInsn(PUTFIELD, typeName, "thiz", "Ljava/lang/Object;");
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 2);
mv.visitFieldInsn(PUTFIELD, typeName, "args", "[Ljava/lang/Object;");
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ILOAD, 3);
mv.visitFieldInsn(PUTFIELD, typeName, "idx", "I");
mv.visitInsn(RETURN);
mv.visitMaxs(-1, -1);
mv.visitEnd();
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, typeName, "args", "[Ljava/lang/Object;");
mv.visitInsn(ARETURN);
mv.visitMaxs(-1, -1);
mv.visitEnd();
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, typeName, "thiz", "Ljava/lang/Object;");
mv.visitInsn(ARETURN);
mv.visitMaxs(-1, -1);
mv.visitEnd();

private void generateMethods(ClassWriter cw, String internalName, List<Method> methods, Class<?> exceptionType) {
  for (Method method: methods) {
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, method.getName(), Type.getMethodDescriptor(method), null, null);
    mv.visitCode();
    mv.visitTypeInsn(NEW, internalException);
    mv.visitInsn(DUP);
    mv.visitLdcInsn("A method was invoked on a dummy class, due to the static field %s not being initialized "
        + "(most likely in a CatalogType-related class).\n"
        + "Method: " + method);
    mv.visitLdcInsn(1);
    mv.visitTypeInsn(ANEWARRAY, "java/lang/String");
    mv.visitVarInsn(Opcodes.ASTORE, 2);
    mv.visitVarInsn(Opcodes.ALOAD, 2);
    mv.visitLdcInsn(0);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, internalName, FIELD_NAME, Type.getDescriptor(String.class));
    mv.visitInsn(AASTORE);
    mv.visitVarInsn(ALOAD, 2);
    mv.visitMethodInsn(INVOKESTATIC, Type.getInternalName(String.class), "format",
      "(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;", false);

    .visitMethod(Opcodes.ACC_STATIC, "<clinit>", "()V", null, null);
mv.visitCode();
for (int i = 0; i < fieldCount; i++) {
  String fieldName = fieldNames.get(i);
  mv.visitTypeInsn(Opcodes.NEW, name);
  mv.visitInsn(Opcodes.DUP);
  mv.visitLdcInsn(fieldName);
  mv.visitIntInsn(Opcodes.BIPUSH, i);
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, name, "<init>", "(Ljava/lang/String;I)V",
            false);
  mv.visitFieldInsn(Opcodes.PUTSTATIC, name, fieldName, classDef.getType());
mv.visitIntInsn(Opcodes.BIPUSH, fieldCount);
mv.visitTypeInsn(Opcodes.ANEWARRAY, name);
  mv.visitInsn(Opcodes.DUP);
  mv.visitIntInsn(Opcodes.BIPUSH, i);
  mv.visitFieldInsn(Opcodes.GETSTATIC, name, fieldName, classDef.getType());
  mv.visitInsn(Opcodes.AASTORE);
mv.visitFieldInsn(Opcodes.PUTSTATIC, name, valuesFieldName, "[" + classDef.getType());
mv.visitInsn(Opcodes.RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
    .visitMethod(Opcodes.ACC_PRIVATE, "<init>", "(Ljava/lang/String;I)V", null, null);
mv.visitCode();
mv.visitVarInsn(Opcodes.ALOAD, 0);

    cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "isEnabled", descriptor, null, null);
visitAnnotation(mv, "Lorg/glowroot/agent/plugin/api/weaving/IsEnabled;");
mv.visitCode();
if (checkNotInTransaction && !checkPropertyNotEnabled) {
  mv.visitVarInsn(ALOAD, 0);
  mv.visitMethodInsn(INVOKEINTERFACE,
      "org/glowroot/agent/plugin/api/OptionalThreadContext", "isInTransaction", "()Z",
      true);
  Label returnTrueLabel = new Label();
  mv.visitJumpInsn(IFEQ, returnTrueLabel);
  mv.visitInsn(ICONST_0);
  mv.visitInsn(IRETURN);
  mv.visitLabel(returnTrueLabel);
  mv.visitInsn(ICONST_1);
  mv.visitInsn(IRETURN);
} else if (!checkNotInTransaction) {
  mv.visitFieldInsn(GETSTATIC, adviceInternalName, "enabled",
      "Lorg/glowroot/agent/plugin/api/config/BooleanProperty;");
  mv.visitMethodInsn(INVOKEINTERFACE,
      "org/glowroot/agent/plugin/api/config/BooleanProperty", "value", "()Z", true);
  mv.visitInsn(IRETURN);
} else {
  mv.visitVarInsn(ALOAD, 0);
  mv.visitMethodInsn(INVOKEINTERFACE,
      "org/glowroot/agent/plugin/api/OptionalThreadContext", "isInTransaction", "()Z",
      true);
  Label returnTrueLabel = new Label();
  mv.visitJumpInsn(IFEQ, returnTrueLabel);

    null,
    null);
methodVisitor.visitCode();
int localIndexOfWaitStrategy = locals.newLocal(WaitStrategy.class);
methodVisitor.visitVarInsn(Opcodes.ALOAD, LOCALS_INDEX_THIS);
methodVisitor.visitVarInsn(Opcodes.ILOAD, localIndexOfCapacity);
methodVisitor.visitLdcInsn(primitiveMessageSize);
methodVisitor.visitLdcInsn(referenceMessageSize);
methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL,
    Type.getInternalName(parentType),
    "<init>",
    methodDescriptor(void.class,
    false);
methodVisitor.visitVarInsn(Opcodes.ALOAD, LOCALS_INDEX_THIS);
methodVisitor.visitVarInsn(Opcodes.ALOAD, localIndexOfWaitStrategy);
methodVisitor.visitFieldInsn(Opcodes.PUTFIELD, generatedName, "waitStrategy", Type.getDescriptor(WaitStrategy.class));
methodVisitor.visitInsn(Opcodes.RETURN);
methodVisitor.visitMaxs(-1, -1);
methodVisitor.visitEnd();

  n.desc = "(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;";
MethodVisitor mv = cv.visitMethod(opcode == INVOKESPECIAL ? ACC_PUBLIC : ACC_PUBLIC
    | ACC_STATIC, n.name, n.desc, null, null);
mv.visitCode();
int start;
if (opcode != INVOKESTATIC) {
  mv.visitVarInsn(ALOAD, 0);
  if (opcode != INVOKESPECIAL) {
    mv.visitTypeInsn(CHECKCAST, toInternal(t.owner));
  start = 0;
Type[] args = Type.getArgumentTypes(t.desc);
  mv.visitVarInsn(ALOAD, start);
  mv.visitLdcInsn(i);
  mv.visitInsn(AALOAD);
  unBox(args[i], OBJECT_TYPE, mv);
mv.visitMethodInsn(opcode, toInternal(t.owner), t.name, t.desc);
Type ret = Type.getReturnType(t.desc);
box(ret, mv);
mv.visitInsn(ARETURN);
mv.visitMaxs(-1, -1);
mv.visitEnd();
return n;

MethodVisitor methodVisitor = classVisitor.visitMethod(Opcodes.ACC_BRIDGE | Opcodes.ACC_SYNTHETIC | Opcodes.ACC_PUBLIC,
    methodName,
    methodDescriptor(bridgeMethodReturnType, bridgeMethodParameterTypes),
    null);
methodVisitor.visitCode();
methodVisitor.visitVarInsn(Opcodes.ALOAD, LOCALS_INDEX_THIS);
for (Class<?> parameterType : parameterTypes) {
  int localIndexOfParameter = locals.newLocal(parameterType);
  int loadOpCode = Type.getType(parameterType).getOpcode(Opcodes.ILOAD);
  methodVisitor.visitVarInsn(loadOpCode, localIndexOfParameter);
    methodVisitor.visitTypeInsn(Opcodes.CHECKCAST, Type.getInternalName(parameterType));
methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
    generatedName,
    methodName,
  methodVisitor.visitTypeInsn(Opcodes.CHECKCAST, Type.getInternalName(returnType));
int returnOpcode = Type.getType(returnType).getOpcode(Opcodes.IRETURN);
methodVisitor.visitInsn(returnOpcode);
methodVisitor.visitMaxs(-1, -1);
methodVisitor.visitEnd();

String travelerType =
    entryOrTimer ? "Ljava/lang/Object;" : "Lorg/glowroot/agent/plugin/api/TraceEntry;";
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "onReturn",
    "(Lorg/glowroot/agent/plugin/api/weaving/OptionalReturn;" + travelerType + ")V",
    null, null);
checkNotNull(mv.visitParameterAnnotation(0,
    "Lorg/glowroot/agent/plugin/api/weaving/BindOptionalReturn;", true)).visitEnd();
checkNotNull(mv.visitParameterAnnotation(1,
    "Lorg/glowroot/agent/plugin/api/weaving/BindTraveler;", true)).visitEnd();
int travelerParamIndex = 1;
visitAnnotation(mv, "Lorg/glowroot/agent/plugin/api/weaving/OnReturn;");
mv.visitCode();
if (!config.traceEntryEnabledProperty().isEmpty()) {
  mv.visitVarInsn(ALOAD, travelerParamIndex);
  mv.visitTypeInsn(INSTANCEOF, "org/glowroot/agent/plugin/api/TraceEntry");
  Label label = new Label();
  mv.visitJumpInsn(IFNE, label);
  mv.visitVarInsn(ALOAD, travelerParamIndex);
  mv.visitTypeInsn(CHECKCAST, "org/glowroot/agent/plugin/api/Timer");
  mv.visitMethodInsn(INVOKEINTERFACE, "org/glowroot/agent/plugin/api/Timer", "stop",
      "()V", true);
  mv.visitInsn(RETURN);
  mv.visitLabel(label);
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEINTERFACE, "org/glowroot/agent/plugin/api/weaving/OptionalReturn",
    "isVoid", "()Z", true);

private void createValueOfEnum() {
  final int opcodes = VisibilityEnum.PUBLIC.getOpCodes() + ModifierEnum.STATIC.getOpCodes();
  final MethodVisitor mv = this.cw.visitMethod(opcodes, "valueOf", "(Ljava/lang/String;)" + this.getEntityEnumName(), null, null);
  mv.visitCode();
  final Label l0 = new Label();
  mv.visitLabel(l0);
  mv.visitLineNumber(1, l0);
  mv.visitLdcInsn(Type.getType(this.getEntityEnumName()));
  mv.visitVarInsn(Opcodes.ALOAD, 0);
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Enum", "valueOf", "(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/Enum;", false);
  mv.visitTypeInsn(Opcodes.CHECKCAST, this.getEntityName());
  mv.visitInsn(Opcodes.ARETURN);
  mv.visitMaxs(2, 1);
  mv.visitEnd();
}

private void generateConstructor(ClassWriter cw, String internalName) {
  cw.visitField(Modifier.PRIVATE, FIELD_NAME, Type.getDescriptor(String.class), null, null);
  MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "(Ljava/lang/String;)V", null, null);
  // Load 'this'
  mv.visitVarInsn(ALOAD, 0);
  // Cal super()
  mv.visitMethodInsn(INVOKESPECIAL, Type.getInternalName(Object.class), "<init>", "()V", false);
  // Load 'this'
  mv.visitVarInsn(ALOAD, 0);
  // Load first method parameter (the fieldName)
  mv.visitVarInsn(ALOAD, 1);
  // Store first parameter in field FIELD_NAME
  mv.visitFieldInsn(PUTFIELD, internalName, FIELD_NAME, Type.getDescriptor(String.class));
  mv.visitInsn(RETURN);
  mv.visitMaxs(0, 0);
  mv.visitEnd();
}

long ms = System.currentTimeMillis();
ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
ClassVisitor cv = new ClassVisitor(Opcodes.ASM5, writer) {
};
String className = Const.SERVICE_LOADER_INIT.replace('.', '/');
cv.visit(50, Opcodes.ACC_PUBLIC, className, null, "java/lang/Object", null);
MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC,
    Const.INIT_METHOD, "()V", null, null);
mv.visitCode();
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, clazz.replace('.', '/'),
      "init",
      "()V",
      false);
mv.visitMaxs(0, 0);
mv.visitInsn(Opcodes.RETURN);
mv.visitEnd();
cv.visitEnd();
new FileOutputStream(dest).write(writer.toByteArray());

Javadoc

A visitor to visit a Java method. The methods of this class must be called in the following order: ( visitParameter )* [ visitAnnotationDefault ] ( visitAnnotation | visitParameterAnnotation visitTypeAnnotation | visitAttribute )* [ visitCode ( visitFrame | visitXInsn | visitLabel | visitInsnAnnotation | visitTryCatchBlock | visitTryCatchAnnotation | visitLocalVariable | visitLocalVariableAnnotation | visitLineNumber ) visitMaxs ] visitEnd. In addition, the visitXInsn and visitLabel methods must be called in the sequential order of the bytecode instructions of the visited code, visitInsnAnnotation must be called after the annotated instruction, visitTryCatchBlock must be called before the labels passed as arguments have been visited, visitTryCatchBlockAnnotation must be called after the corresponding try catch block has been visited, and the visitLocalVariable, visitLocalVariableAnnotation and visitLineNumber methods must be called after the labels passed as arguments have been visited.

Most used methods

visitMethodInsn
Visits a method instruction. A method instruction is an instruction that invokes a method.
visitInsn
Visits a zero operand instruction.
visitVarInsn
Visits a local variable instruction. A local variable instruction is an instruction that loads or st
visitMaxs
Visits the maximum stack size and the maximum number of local variables of the method.
visitEnd
Visits the end of the method. This method, which is the last one to be called, is used to inform the
visitCode
Starts the visit of the method's code, if any (i.e. non abstract method).
visitFieldInsn
Visits a field instruction. A field instruction is an instruction that loads or stores the value of
visitTypeInsn
Visits a type instruction. A type instruction is an instruction that takes the internal name of a cl
visitLabel
Visits a label. A label designates the instruction that will be visited just after it.
visitLdcInsn
Visits a LDC instruction. Note that new constant types may be added in future versions of the Java V
visitJumpInsn
Visits a jump instruction. A jump instruction is an instruction that may jump to another instruction
visitIntInsn
Visits an instruction with a single int operand.

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How to useMethodVisitor in org.objectweb.asm

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