org.objectweb.asm.MethodVisitor.visitEnd 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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}

private void visitInitStub(ClassDef classDef, MethodVisitor mv) {
  mv.visitCode();
  mv.visitVarInsn(Opcodes.ALOAD, 0);
  if (classDef.getSuperclass() != null) {
    String superName = stripName(classDef.getSuperclass());
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, superName, "<init>", "()V", false);
  }
  mv.visitInsn(Opcodes.RETURN);
  mv.visitMaxs(0, 0);
  mv.visitEnd();
}

private void visitMethod(ClassDef classDef, Method method, MethodVisitor mv) {
  mv.visitCode();
  String methodName = method.getName();
  if (methodName.equals("<clinit>")) {
    visitClInitStub(mv);
  } else if (methodName.equals("<init>")) {
    visitInitStub(classDef, mv);
  } else if (methodName.equals("hashCode") && method.getReturnType().equals("I")) {
    visitCallObjectHashCode(mv);
  } else {
    visitMethodStub(mv);
  }
  // Do this at the end so ASM can calculate max stack and locals sizes
  mv.visitMaxs(0, 0);
  mv.visitEnd();
}

bridgeWriter.visitMethodInsn(INVOKESPECIAL, declaringTypeReference.getInternalName(), methodName, overrideDescriptor, false);
pushReturnValue(bridgeWriter, returnType);
bridgeWriter.visitMaxs(DEFAULT_MAX_STACK, 1);
bridgeWriter.visitEnd();

constructorWriter.visitInsn(RETURN);
constructorWriter.visitMaxs(DEFAULT_MAX_STACK, 1);
this.constructorWriter.visitEnd();
proxyBeanDefinitionWriter.visitBeanDefinitionEnd();
if (targetDefinitionGenerator != null) {

    mv.visitCode();
    convertCode(methodNode, mv);
mv.visitEnd();

private static void implementProxy(ClassVisitor classVisitor, Class<?> iFace, String generatedName) {
  MethodVisitor methodVisitor = classVisitor.visitMethod(Opcodes.ACC_PUBLIC,
      "proxy",
      methodDescriptor(iFace),
      null,
      null);
  methodVisitor.visitCode();
  methodVisitor.visitVarInsn(Opcodes.ALOAD, LOCALS_INDEX_THIS);
  methodVisitor.visitInsn(Opcodes.ARETURN);
  methodVisitor.visitMaxs(-1, -1);
  methodVisitor.visitEnd();
  
  implementBridgeMethod(classVisitor, generatedName, "proxy", iFace);
}

private void parseMethodBody() {
  labels.clear();
  declaredLabels.clear();
  mv.visitCode();
  while (true) {
    readLine();
    if (line.startsWith(".end method")) {
      break;
    } else if (line.startsWith(".")) {
      parseMethodDirective();
    } else if (lineMatch(labelPattern)) {
      parseLabel();
    } else {
      parseInstructions();
    }
  }
  checkLabelDeclarations();
  mv.visitMaxs(maxStack, maxLocals);
  mv.visitEnd();
}

 methodVisitor.visitCode();
 readCode(methodVisitor, context, codeOffset);
methodVisitor.visitEnd();
return currentOffset;

private static void implementProxyInstance(ClassVisitor classVisitor, Class<?> iFace, String generatedName) {
  MethodVisitor methodVisitor = classVisitor.visitMethod(Opcodes.ACC_PUBLIC,
      "proxyInstance",
      methodDescriptor(iFace, iFace),
      null,
      null);
  methodVisitor.visitCode();
  methodVisitor.visitVarInsn(Opcodes.ALOAD, LOCALS_INDEX_THIS);
  methodVisitor.visitInsn(Opcodes.ARETURN);
  methodVisitor.visitMaxs(-1, -1);
  methodVisitor.visitEnd();
  
  implementBridgeMethod(classVisitor, generatedName, "proxyInstance", iFace, iFace);
}

 mv.visitCode();
 generateMethodBody(mv, sm);
 mv.visitMaxs(0, 0);
mv.visitEnd();

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();
    mv.visitLabel(e.getValue());
    mv.visitLdcInsn(e.getKey());
    mv.visitInsn(ARETURN);
  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 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();
}

mv.visitCode();
int start;
if (opcode != INVOKESTATIC) {
  mv.visitVarInsn(ALOAD, 0);
  if (opcode != INVOKESPECIAL) {
    mv.visitTypeInsn(CHECKCAST, toInternal(t.owner));
  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;

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.visitInsn(DUP);
    mv.visitVarInsn(Opcodes.ASTORE, 2);
    mv.visitVarInsn(Opcodes.ALOAD, 2);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, internalName, FIELD_NAME, Type.getDescriptor(String.class));
    mv.visitInsn(AASTORE);
    mv.visitMethodInsn(INVOKESTATIC, Type.getInternalName(String.class), "format",
      "(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;", false);
    mv.visitMethodInsn(INVOKESPECIAL, internalException, "<init>", "(Ljava/lang/String;)V", false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(0, 0);
    mv.visitEnd();

    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>",
    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();

    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.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
    generatedName,
    methodName,
methodVisitor.visitInsn(returnOpcode);
methodVisitor.visitMaxs(-1, -1);
methodVisitor.visitEnd();

mv.visitInsn(DUP);
if (hasThis) {
  mv.visitVarInsn(ALOAD, 0);
  start = 1;
} else {
  mv.visitInsn(ACONST_NULL);
  start = 0;
  mv.visitInsn(ACONST_NULL);
} else {
  mv.visitLdcInsn(args.length);
    mv.visitInsn(DUP);
    mv.visitLdcInsn(i);
    mv.visitVarInsn(args[i].getOpcode(ILOAD), i + start);
    box(args[i], mv);
    mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKESPECIAL, getCurrentInvocationName(), "<init>",
    "(Ljava/lang/Object;[Ljava/lang/Object;I)V");
mv.visitMethodInsn(INVOKESTATIC, toInternal(mapTo.owner), mapTo.name, mapTo.desc);
unBox(ret, Type.getReturnType(mapTo.desc), mv);
mv.visitInsn(ret.getOpcode(IRETURN));
mv.visitMaxs(-1, -1);
mv.visitEnd();

mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitInsn(RETURN);
mv.visitMaxs(-1, -1);
mv.visitEnd();
mv.visitCode();
mv.visitInsn(ARETURN);
mv.visitMaxs(-1, -1);
mv.visitEnd();
mv.visitCode();
mv.visitInsn(ARETURN);
mv.visitMaxs(-1, -1);
mv.visitEnd();
    mv.visitMethodInsn(INVOKESTATIC, toInternal(m.owner), m.name, m.desc);
    mv.visitMethodInsn(INVOKEVIRTUAL, toInternal(m.owner), m.name, m.desc);
mv.visitEnd();

    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();

mv.visitCode();
  mv.visitInsn(Opcodes.DUP);
  mv.visitIntInsn(Opcodes.BIPUSH, i);
  mv.visitFieldInsn(Opcodes.GETSTATIC, name, fieldName, classDef.getType());
  mv.visitInsn(Opcodes.AASTORE);
mv.visitMaxs(0, 0);
mv.visitEnd();
mv.visitCode();
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitVarInsn(Opcodes.ALOAD, 1);
mv.visitVarInsn(Opcodes.ILOAD, 2);
mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Enum", "<init>",
mv.visitMaxs(0, 0);
mv.visitEnd();
mv.visitCode();
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/System", "arraycopy",
mv.visitMaxs(0, 0);
mv.visitEnd();
mv.visitEnd();

Javadoc

Visits the end of the method. This method, which is the last one to be called, is used to inform the visitor that all the annotations and attributes of the method have been visited.

Popular methods of MethodVisitor

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.
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.
visitLocalVariable
Visits a local variable declaration.

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How to use visitEndmethodin org.objectweb.asm.MethodVisitor

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visitEnd
method
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org.objectweb.asm.MethodVisitor