org.objectweb.asm.MethodVisitor.visitFieldInsn 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 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()];
    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();

switch (t.getSort()) {
  case Type.BOOLEAN:
    super.visitFieldInsn(GETSTATIC, "java/lang/Boolean", "TYPE", "Ljava/lang/Class;");
    break;
  case Type.BYTE:
    super.visitFieldInsn(GETSTATIC, "java/lang/Byte", "TYPE", "Ljava/lang/Class;");
    break;
  case Type.CHAR:
    super.visitFieldInsn(GETSTATIC, "java/lang/Character", "TYPE", "Ljava/lang/Class;");
    break;
  case Type.DOUBLE:
    super.visitFieldInsn(GETSTATIC, "java/lang/Double", "TYPE", "Ljava/lang/Class;");
    break;
  case Type.FLOAT:
    super.visitFieldInsn(GETSTATIC, "java/lang/Float", "TYPE", "Ljava/lang/Class;");
    break;
  case Type.INT:
    super.visitFieldInsn(GETSTATIC, "java/lang/Integer", "TYPE", "Ljava/lang/Class;");
    break;
  case Type.LONG:
    super.visitFieldInsn(GETSTATIC, "java/lang/Long", "TYPE", "Ljava/lang/Class;");
    break;
  case Type.SHORT:
    super.visitFieldInsn(GETSTATIC, "java/lang/Short", "TYPE", "Ljava/lang/Class;");
    break;
  default:

switch (value.vt) {
case LOCAL:
  asm.visitVarInsn(getOpcode(value, ILOAD), ((Local) value)._ls_index);
  break;
case CONSTANT:
  Constant cst = (Constant) value;
  if (cst.value.equals(Constant.Null)) {
    asm.visitInsn(ACONST_NULL);
  } else if (cst.value instanceof DexType) {
    asm.visitLdcInsn(Type.getType(((DexType) cst.value).desc));
case STATIC_FIELD:
  StaticFieldExpr sfe= (StaticFieldExpr) value;
  asm.visitFieldInsn(GETSTATIC,toInternal(sfe.owner),sfe.name,sfe.type);
  break;

public void generateCodeThatIncrementsCoberturaCounter(
    MethodVisitor nextMethodVisitor, Integer counterId, String className) {
  /*cobertura_counters.incrementAndGet(i);*/
  /*cobertura_counters.*/
  nextMethodVisitor.visitFieldInsn(Opcodes.GETSTATIC, className,
      COBERTURA_COUNTERS_FIELD_NAME, COBERTURA_COUNTERS_FIELD_TYPE);
  /*index:*/
  nextMethodVisitor.visitLdcInsn((int) counterId);
  nextMethodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type
      .getInternalName(AtomicIntegerArray.class), "incrementAndGet",
      "(I)I");
  nextMethodVisitor.visitInsn(Opcodes.POP);
}

@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();
}

private void writeGenericReturnTypeFieldInitializer(MethodVisitor mv, ReturnTypeEntry returnType) {
  mv.visitLdcInsn(generatedType);
  // <class>.getDeclaredMethod(<getter-name>)
  mv.visitLdcInsn(returnType.getterName);
  mv.visitInsn(Opcodes.ICONST_0);
  mv.visitTypeInsn(Opcodes.ANEWARRAY, CLASS_TYPE.getInternalName());
  mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, CLASS_TYPE.getInternalName(), "getDeclaredMethod", GET_DECLARED_METHOD_DESCRIPTOR, false);
  // <method>.getGenericReturnType()
  mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, METHOD_TYPE.getInternalName(), "getGenericReturnType", Type.getMethodDescriptor(JAVA_LANG_REFLECT_TYPE), false);
  mv.visitFieldInsn(PUTSTATIC, generatedType.getInternalName(), returnType.fieldName, JAVA_REFLECT_TYPE_DESCRIPTOR);
}

accept(v2, asm);
insertI2x(v2.valueType, fe.type, asm);
asm.visitFieldInsn(PUTSTATIC, toInternal(fe.owner), fe.name, fe.type);
break;
accept(v2, asm);
insertI2x(v2.valueType, fe.type, asm);
asm.visitFieldInsn(PUTFIELD, toInternal(fe.owner), fe.name, fe.type);
break;
  String arrayElementType = tp1.substring(1);
  insertI2x(v2.valueType, arrayElementType, asm);
  asm.visitInsn(getOpcode(arrayElementType, IASTORE));
int index = ((Local) e2.op1)._ls_index;
if (index >= 0) {
  asm.visitVarInsn(ASTORE, index);
  asm.visitVarInsn(getOpcode(v, ISTORE), nIndex);
  lockMap.put(key, nIndex);

case STATIC_FIELD: {
  FieldExpr fe = (FieldExpr) e1;
  asm.visitFieldInsn(GETSTATIC, toInternal(fe.owner), fe.name, fe.type);
  break;
  asm.visitFieldInsn(GETFIELD, toInternal(fe.owner), fe.name, fe.type);
  break;
  asm.visitInsn(ARRAYLENGTH);
  break;
case NEG:
  asm.visitInsn(getOpcode(e1, INEG));
  break;

@Override
public void visitCode() {
  mv.visitVarInsn(ALOAD, 0);
  mv.visitFieldInsn(GETFIELD, ownerClass, "channel", "Lio/netty/channel/Channel;");
  mv.visitVarInsn(ALOAD, 1);
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_MAIN, START_METHOD, START_SIGNATURE, false);
  statIdx = newLocal(Type.getType(Object.class));
  mv.visitVarInsn(Opcodes.ASTORE, statIdx);
  mv.visitLabel(startFinally);
  mv.visitCode();
}

Value v = f.getStack(i);
int insn = v.isCategory1() ? POP : POP2;
mv.visitInsn(insn);
if (vi.var == -1) {
  loadVar(mv, TOBJECT, stateVar);
  mv.visitFieldInsn(GETFIELD, stateClassName, vi.fieldName, vi.fieldDesc());
  checkcast(mv, v);
} else {

@Override
public void visitCode() {
  mv.visitVarInsn(ALOAD, 0);
  mv.visitVarInsn(ALOAD, 0);
  mv.visitFieldInsn(GETFIELD, owner, TraceSQL.PSTMT_PARAM_FIELD, "Lscouter/agent/trace/SqlParameter;");
  AsmUtil.PUSH(mv, this.methodType);
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACESQL, START_METHOD, START_SIGNATURE,false);
  statIdx = newLocal(Type.getType(Object.class));
  mv.visitVarInsn(Opcodes.ASTORE, statIdx);
  mv.visitLabel(startFinally);
  mv.visitCode();
}

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();
}

@Override
public void visitInsn(int opcode) {
  if (sqlIdx >= 0 && (opcode >= IRETURN && opcode <= RETURN)) {
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACESQL, METHOD_INIT, SIGNATURE_INIT, false);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, owner, TraceSQL.PSTMT_PARAM_FIELD, "Lscouter/agent/trace/SqlParameter;");
    Label end = new Label();
    mv.visitJumpInsn(IFNONNULL, end);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitTypeInsn(NEW, Type.getInternalName(SqlParameter.class));
    mv.visitInsn(DUP);
    mv.visitMethodInsn(INVOKESPECIAL, Type.getInternalName(SqlParameter.class), "<init>", "()V",false);
    mv.visitFieldInsn(PUTFIELD, owner, TraceSQL.PSTMT_PARAM_FIELD, "Lscouter/agent/trace/SqlParameter;");
    mv.visitLabel(end);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, owner, TraceSQL.PSTMT_PARAM_FIELD, "Lscouter/agent/trace/SqlParameter;");
    mv.visitVarInsn(ALOAD, sqlIdx);
    if(isUstatement) {
      mv.visitMethodInsn(INVOKEVIRTUAL, "cubrid/jdbc/jci/UStatement", "getQuery", "()Ljava/lang/String;", false);
    }
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACESQL, METHOD, SIGNATURE,false);
  }
  mv.visitInsn(opcode);
}

  @Override
  public void visitCode() {
    int hostIdx = newLocal(Type.getType("Ljava/lang/String;"));
    int portIdx = newLocal(Type.INT_TYPE);

    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, "client", "Lredis/clients/jedis/Client;");
    mv.visitMethodInsn(INVOKEVIRTUAL, "redis/clients/jedis/Client", "getHost", "()Ljava/lang/String;", false);
    mv.visitVarInsn(ASTORE, hostIdx);

    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, "client", "Lredis/clients/jedis/Client;");
    mv.visitMethodInsn(INVOKEVIRTUAL, "redis/clients/jedis/Client", "getPort", "()I", false);
    mv.visitVarInsn(ISTORE, portIdx);

    mv.visitVarInsn(ALOAD, hostIdx);
    mv.visitVarInsn(ILOAD, portIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, START_METHOD, START_SIGNATURE, false);

    mv.visitCode();
  }
}

mv.visitInsn(Opcodes.ACONST_NULL);
mv.visitVarInsn(Opcodes.ASTORE, 30);
mv.visitVarInsn(Opcodes.ALOAD, 2);
mv.visitJumpInsn(Opcodes.IFNULL, sqlIsNull);
mv.visitVarInsn(Opcodes.ALOAD, 2);
mv.visitVarInsn(Opcodes.ASTORE, 30);
mv.visitJumpInsn(Opcodes.GOTO, endIf);
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitFieldInsn(Opcodes.GETFIELD, "com/mysql/jdbc/ConnectionImpl", "host", "Ljava/lang/String;");
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitFieldInsn(Opcodes.GETFIELD, "com/mysql/jdbc/ConnectionImpl", "port", "I");
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitFieldInsn(Opcodes.GETFIELD, "com/mysql/jdbc/ConnectionImpl", "database", "Ljava/lang/String;");
mv.visitVarInsn(Opcodes.ALOAD, 30);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "com/taobao/profile/Profiler", "start4Mysql", "(Ljava/lang/String;ILjava/lang/String;Ljava/lang/String;)V");
mv.visitCode();

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();

  public void visitInsn(int opcode) {
    if ((opcode >= IRETURN && opcode <= RETURN)) {
      Type tp = returnType;
      if (tp.getSort() == Type.ARRAY && tp.getElementType().getSort() == Type.BYTE) {
        mv.visitInsn(Opcodes.DUP);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, this.className, KEY_ELEMENT_FIELD, "Ljava/lang/Object;");
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, START_METHOD, START_SIGNATURE, false);
      }
    }
    mv.visitInsn(opcode);
  }
}

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.visitFieldInsn(PUTFIELD, typeName, "args", "[Ljava/lang/Object;");
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();
mv.visitFieldInsn(GETFIELD, typeName, "idx", "I");

    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();

mv.visitCode();
  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.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();
mv.visitMaxs(0, 0);
mv.visitEnd();
mv.visitCode();
mv.visitFieldInsn(Opcodes.GETSTATIC, name, valuesFieldName, "[" + classDef.getType());
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/System", "arraycopy",

Javadoc

Visits a field instruction. A field instruction is an instruction that loads or stores the value of a field of an object.

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.
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).
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 visitFieldInsnmethodin org.objectweb.asm.MethodVisitor

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visitFieldInsn
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