org.objectweb.asm.MethodVisitor.visitTypeInsn 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 static void createShortObj(MethodVisitor mv, int argsPostion) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/Short");
  mv.visitInsn(Opcodes.DUP);
  mv.visitVarInsn(Opcodes.ILOAD, argsPostion);
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Short", "<init>", "(S)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);
}

mv.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Boolean");//强制转化类型
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z");
return true;
mv.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Byte");//强制转化类型
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Byte", "byteValue", "()B");
return true;
mv.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Character");//强制转化类型
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Character", "intValue", "()C");
return true;
mv.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Short");//强制转化类型
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Short", "shortValue", "()S");
return true;
mv.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Integer");//强制转化类型
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Integer", "intValue", "()I");
return true;
mv.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Float");//强制转化类型
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Float", "floatValue", "()F");
return true;
mv.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Double");//强制转化类型
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Double", "doubleValue", "()D");
return true;
mv.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Long");//强制转化类型

private void loadAndStoreArgument(MethodVisitor mv, int loadIdx, int storeIdx, String castName) {
  mv.visitVarInsn(ALOAD, 1); //loads the 1st argument
  addConst(mv, loadIdx);
  mv.visitMethodInsn(INVOKEINTERFACE, "org/apache/pig/data/Tuple", "get", "(I)Ljava/lang/Object;");
  mv.visitTypeInsn(CHECKCAST, castName);
  mv.visitVarInsn(ASTORE, storeIdx);
}

  mv.visitIntInsn(Opcodes.BIPUSH, argsCount);
} else {
  mv.visitInsn(Opcodes.ICONST_0 + argsCount);
mv.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
  mv.visitInsn(Opcodes.DUP);
  if (i <= 5) {
    mv.visitInsn(Opcodes.ICONST_0 + i);
  } else {
    mv.visitIntInsn(Opcodes.BIPUSH, i);
    mv.visitVarInsn(Opcodes.ALOAD, loadIndex);
    mv.visitInsn(Opcodes.AASTORE);

    return;
  mv.visitTypeInsn(CHECKCAST, TypeDesc.getInternalName(valType));
  break;
case VMType.TINT:
  else
    assert valType == D_BOOLEAN;
  mv.visitInsn(insn);
  break;
default:

private static void getReference(MethodVisitor methodVisitor,
    Class<?> parameterType,
    int localIndexOfArrayReferenceBaseIndex,
    int arrayReferenceBaseIndexDelta,
    Class<? extends ProxyChannelRingBuffer> backendType) {
  methodVisitor.visitVarInsn(Opcodes.ALOAD, LOCALS_INDEX_THIS);
  loadLocalIndexAndApplyDelta(methodVisitor, localIndexOfArrayReferenceBaseIndex, arrayReferenceBaseIndexDelta);
  readReference(methodVisitor, backendType);
  if (parameterType != Object.class) {
    methodVisitor.visitTypeInsn(Opcodes.CHECKCAST, Type.getInternalName(parameterType));
  }
}

private static void createCharObj(MethodVisitor mv, int argsPostion) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/Character");
  mv.visitInsn(Opcodes.DUP);
  mv.visitVarInsn(Opcodes.ILOAD, argsPostion);
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Character", "<init>", "(C)V");
  mv.visitInsn(Opcodes.AASTORE);
}

  @Override
  public void handleMethodTranslateException(Method method, DexMethodNode methodNode, MethodVisitor mv, Exception e) {
    // replace the generated code with
    // 'return new RuntimeException("D2jFail translate: xxxxxxxxxxxxx");'
    StringWriter s = new StringWriter();
    s.append("d2j fail translate: ");
    e.printStackTrace(new PrintWriter(s));
    String msg = s.toString();
    mv.visitTypeInsn(Opcodes.NEW, "java/lang/RuntimeException");
    mv.visitInsn(Opcodes.DUP);
    mv.visitLdcInsn(msg);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V");
    mv.visitInsn(Opcodes.ATHROW);
  }
}

  public void add(MethodVisitor visitor) throws Exception {
    // GENERATE ((MixInExtensibleDynamicObject)getAsDynamicObject()).getConvention()
    visitor.visitVarInsn(Opcodes.ALOAD, 0);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, generatedType.getInternalName(), "getAsDynamicObject", Type.getMethodDescriptor(getAsDynamicObject), false);
    visitor.visitTypeInsn(Opcodes.CHECKCAST, EXTENSIBLE_DYNAMIC_OBJECT_HELPER_TYPE.getInternalName());
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, EXTENSIBLE_DYNAMIC_OBJECT_HELPER_TYPE.getInternalName(), "getConvention", RETURN_CONVENTION, false);
  }
});

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));
  asm.visitTypeInsn(NEW, toInternal(((NewExpr) value).type));
  break;
case STATIC_FIELD:

  mv.visitTypeInsn(CHECKCAST, "java/lang/Boolean");
  mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z", false);
} else if (type.getSort() == Type.INT) {
  mv.visitTypeInsn(CHECKCAST, "java/lang/Integer");
  mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Integer", "intValue", "()I", false);
} else if (type.getSort() == Type.BYTE) {
  mv.visitTypeInsn(CHECKCAST, "java/lang/Byte");
  mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Byte", "byteValue", "()B", false);
} else if (type.getSort() == Type.SHORT) {
  mv.visitTypeInsn(CHECKCAST, "java/lang/Short");
  mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Short", "shortValue", "()S", false);
} else if (type.getSort() == Type.LONG) {
  mv.visitTypeInsn(CHECKCAST, "java/lang/Long");
  mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Long", "longValue", "()J", false);
} else if (type.getSort() == Type.FLOAT) {
  mv.visitTypeInsn(CHECKCAST, "java/lang/Float");
  mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Float", "floatValue", "()F", false);
} else if (type.getSort() == Type.DOUBLE) {
  mv.visitTypeInsn(CHECKCAST, "java/lang/Double");
  mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Double", "doubleValue", "()D", false);
} else if (type.getSort() == Type.CHAR) {
  mv.visitTypeInsn(CHECKCAST, "java/lang/Character");
  mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Character", "charValue", "()C", false);
} else {
  mv.visitTypeInsn(CHECKCAST, type.getInternalName());

  case '[':
  case 'L':
    asm.visitTypeInsn(ANEWARRAY, toInternal(te.type));
    break;
  case 'Z':
case INSTANCE_OF: {
  TypeExpr te = (TypeExpr) e1;
  asm.visitTypeInsn(e1.vt == VT.CHECK_CAST ? CHECKCAST : INSTANCEOF, toInternal(te.type));
  asm.visitInsn(ARRAYLENGTH);
  break;
case NEG:
  asm.visitInsn(getOpcode(e1, INEG));
  break;

private static void createLongObj(MethodVisitor mv, int argsPostion) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/Long");
  mv.visitInsn(Opcodes.DUP);
  mv.visitVarInsn(Opcodes.LLOAD, argsPostion);
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Long", "<init>", "(J)V");
  mv.visitInsn(Opcodes.AASTORE);
}

case Type.OBJECT:
case Type.ARRAY:
  mv.visitTypeInsn(CHECKCAST, orgRet.getInternalName());
  break;
case Type.INT:
  mv.visitTypeInsn(CHECKCAST, "java/lang/Number");
  mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Number", "intValue", "()I");
  break;
case Type.FLOAT:
  mv.visitTypeInsn(CHECKCAST, "java/lang/Number");
  mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Number", "floatValue", "()F");
  break;
case Type.LONG:
  mv.visitTypeInsn(CHECKCAST, "java/lang/Number");
  mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Number", "longValue", "()J");
  break;
case Type.DOUBLE:
  mv.visitTypeInsn(CHECKCAST, "java/lang/Number");
case Type.BYTE:
  mv.visitTypeInsn(CHECKCAST, "java/lang/Number");
case Type.SHORT:
  mv.visitTypeInsn(CHECKCAST, "java/lang/Number");
case Type.CHAR:
  mv.visitTypeInsn(CHECKCAST, "java/lang/Character");
case Type.BOOLEAN:

private void  emitIntFromAccu(){
  mv.visitVarInsn(ALOAD, ACCU);			// ((Integer) accu).intValue()
  mv.visitTypeInsn(CHECKCAST, getInternalName(Integer.class));
  mv.visitMethodInsn(INVOKEVIRTUAL, getInternalName(Integer.class), "intValue", getMethodDescriptor(INT_TYPE), false);
}

@Override
public void emitInstanceInit(MethodVisitor mv) {
 mv.visitVarInsn(Opcodes.ALOAD, 0); // this
 mv.visitInsn(Opcodes.ICONST_1);
 mv.visitTypeInsn(Opcodes.ANEWARRAY, wrapperType.getWrapperType().getInternalName());
 mv.visitFieldInsn(Opcodes.PUTFIELD, className, fieldName, fieldDescriptor);
}

if (type.isPrimitive()) {
  if (type.equals(long.class)) {
    method.visitTypeInsn(CHECKCAST, getInternalName(Long.class));
    method.visitMethodInsn(INVOKEVIRTUAL, getInternalName(Long.class),
                "longValue", "()J", false);
    return 1;
  } else if (type.equals(int.class)) {
    method.visitTypeInsn(CHECKCAST, getInternalName(Integer.class));
    method.visitMethodInsn(INVOKEVIRTUAL, getInternalName(Integer.class),
                "intValue", "()I", false);
    return 0;
  } else if (type.equals(double.class)) {
    method.visitTypeInsn(CHECKCAST, getInternalName(Double.class));
    method.visitMethodInsn(INVOKEVIRTUAL, getInternalName(Double.class),
                "doubleValue", "()D", false);
    return 1;
  method.visitTypeInsn(CHECKCAST, getInternalName(type));
  return 0;

private static void createIntegerObj(MethodVisitor mv, int argsPostion) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/Integer");
  mv.visitInsn(Opcodes.DUP);
  mv.visitVarInsn(Opcodes.ILOAD, argsPostion);
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Integer", "<init>", "(I)V");
  mv.visitInsn(Opcodes.AASTORE);
}

case 'J':
case 'D':
  asm.visitInsn(POP2);
  break;
default:
  asm.visitInsn(POP);
  break;
asm.visitTypeInsn(CHECKCAST, toInternal(expectedType));
return;
asm.visitTypeInsn(CHECKCAST, "java/lang/Boolean");
asm.visitTypeInsn(CHECKCAST, "java/lang/Byte");
asm.visitTypeInsn(CHECKCAST, "java/lang/Short");
asm.visitTypeInsn(CHECKCAST, "java/lang/Character");
asm.visitTypeInsn(CHECKCAST, "java/lang/Integer");
asm.visitTypeInsn(CHECKCAST, "java/lang/Float");
asm.visitTypeInsn(CHECKCAST, "java/lang/Long");
asm.visitTypeInsn(CHECKCAST, "java/lang/Double");

Javadoc

Visits a type instruction. A type instruction is an instruction that takes the internal name of a class as parameter.

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).
visitFieldInsn
Visits a field instruction. A field instruction is an instruction that loads or stores the value of
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 visitTypeInsnmethodin org.objectweb.asm.MethodVisitor

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