Java Constants.T_ARRAY属性代码示例

public Instruction createAppend(Type type) {
  byte t = type.getType();

  if(isString(type))
    return createInvoke(append_mos[0], Constants.INVOKEVIRTUAL);

  switch(t) {
  case Constants.T_BOOLEAN:
  case Constants.T_CHAR:
  case Constants.T_FLOAT:
  case Constants.T_DOUBLE:
  case Constants.T_BYTE:
  case Constants.T_SHORT:
  case Constants.T_INT:
  case Constants.T_LONG
    :   return createInvoke(append_mos[t], Constants.INVOKEVIRTUAL);
  case Constants.T_ARRAY:
  case Constants.T_OBJECT:
    return createInvoke(append_mos[1], Constants.INVOKEVIRTUAL);
  default:
    throw new RuntimeException("Oops: No append for this type? " + type);
  }
}
 

/** Create typed return
 */
public static ReturnInstruction createReturn(Type type) {
  switch(type.getType()) {
  case Constants.T_ARRAY:
  case Constants.T_OBJECT:  return ARETURN;
  case Constants.T_INT:
  case Constants.T_SHORT:
  case Constants.T_BOOLEAN:
  case Constants.T_CHAR:
  case Constants.T_BYTE:    return IRETURN;
  case Constants.T_FLOAT:   return FRETURN;
  case Constants.T_DOUBLE:  return DRETURN;
  case Constants.T_LONG:    return LRETURN;
  case Constants.T_VOID:    return RETURN;

  default:
    throw new RuntimeException("Invalid type: " + type);
  }
}
 

/**
 * @param index index of local variable
 */
public static LocalVariableInstruction createStore(Type type, int index) {
  switch(type.getType()) {
  case Constants.T_BOOLEAN:
  case Constants.T_CHAR:
  case Constants.T_BYTE:
  case Constants.T_SHORT:
  case Constants.T_INT:    return new ISTORE(index);
  case Constants.T_FLOAT:  return new FSTORE(index);
  case Constants.T_DOUBLE: return new DSTORE(index);
  case Constants.T_LONG:   return new LSTORE(index);
  case Constants.T_ARRAY:
  case Constants.T_OBJECT: return new ASTORE(index);
  default:       throw new RuntimeException("Invalid type " + type);
  }
}
 

/**
 * @param index index of local variable
 */
public static LocalVariableInstruction createLoad(Type type, int index) {
  switch(type.getType()) {
  case Constants.T_BOOLEAN:
  case Constants.T_CHAR:
  case Constants.T_BYTE:
  case Constants.T_SHORT:
  case Constants.T_INT:    return new ILOAD(index);
  case Constants.T_FLOAT:  return new FLOAD(index);
  case Constants.T_DOUBLE: return new DLOAD(index);
  case Constants.T_LONG:   return new LLOAD(index);
  case Constants.T_ARRAY:
  case Constants.T_OBJECT: return new ALOAD(index);
  default:       throw new RuntimeException("Invalid type " + type);
  }
}
 

/**
 * @param type type of elements of array, i.e., array.getElementType()
 */
public static ArrayInstruction createArrayLoad(Type type) {
  switch(type.getType()) {
  case Constants.T_BOOLEAN:
  case Constants.T_BYTE:   return BALOAD;
  case Constants.T_CHAR:   return CALOAD;
  case Constants.T_SHORT:  return SALOAD;
  case Constants.T_INT:    return IALOAD;
  case Constants.T_FLOAT:  return FALOAD;
  case Constants.T_DOUBLE: return DALOAD;
  case Constants.T_LONG:   return LALOAD;
  case Constants.T_ARRAY:
  case Constants.T_OBJECT: return AALOAD;
  default:       throw new RuntimeException("Invalid type " + type);
  }
}
 

/**
 * @param type type of elements of array, i.e., array.getElementType()
 */
public static ArrayInstruction createArrayStore(Type type) {
  switch(type.getType()) {
  case Constants.T_BOOLEAN:
  case Constants.T_BYTE:   return BASTORE;
  case Constants.T_CHAR:   return CASTORE;
  case Constants.T_SHORT:  return SASTORE;
  case Constants.T_INT:    return IASTORE;
  case Constants.T_FLOAT:  return FASTORE;
  case Constants.T_DOUBLE: return DASTORE;
  case Constants.T_LONG:   return LASTORE;
  case Constants.T_ARRAY:
  case Constants.T_OBJECT: return AASTORE;
  default:       throw new RuntimeException("Invalid type " + type);
  }
}
 

/** Create "null" value for reference types, 0 for basic types like int
 */
public static Instruction createNull(Type type) {
  switch(type.getType()) {
  case Constants.T_ARRAY:
  case Constants.T_OBJECT:  return ACONST_NULL;
  case Constants.T_INT:
  case Constants.T_SHORT:
  case Constants.T_BOOLEAN:
  case Constants.T_CHAR:
  case Constants.T_BYTE:    return ICONST_0;
  case Constants.T_FLOAT:   return FCONST_0;
  case Constants.T_DOUBLE:  return DCONST_0;
  case Constants.T_LONG:    return LCONST_0;
  case Constants.T_VOID:    return NOP;

  default:
    throw new RuntimeException("Invalid type: " + type);
  }
}
 

/**
 * Return type of signature as a byte value as defined in <em>Constants</em>
 *
 * @param  signature in format described above
 * @return type of signature
 * @see    Constants
 */
public static final byte typeOfSignature(String signature)
  throws ClassFormatException
{
  try {
    switch(signature.charAt(0)) {
    case 'B' : return Constants.T_BYTE;
    case 'C' : return Constants.T_CHAR;
    case 'D' : return Constants.T_DOUBLE;
    case 'F' : return Constants.T_FLOAT;
    case 'I' : return Constants.T_INT;
    case 'J' : return Constants.T_LONG;
    case 'L' : return Constants.T_REFERENCE;
    case '[' : return Constants.T_ARRAY;
    case 'V' : return Constants.T_VOID;
    case 'Z' : return Constants.T_BOOLEAN;
    case 'S' : return Constants.T_SHORT;
    default:
      throw new ClassFormatException("Invalid method signature: " + signature);
    }
  } catch(StringIndexOutOfBoundsException e) {
    throw new ClassFormatException("Invalid method signature: " + signature);
  }
}
 

/**
 * Constructor for array of given type
 *
 * @param type type of array (may be an array itself)
 */
public ArrayType(Type type, int dimensions) {
  super(Constants.T_ARRAY, "<dummy>");

  if((dimensions < 1) || (dimensions > Constants.MAX_BYTE))
    throw new ClassGenException("Invalid number of dimensions: " + dimensions);

  switch(type.getType()) {
  case Constants.T_ARRAY:
    ArrayType array = (ArrayType)type;
    this.dimensions = dimensions + array.dimensions;
    basic_type      = array.basic_type;
    break;

  case Constants.T_VOID:
    throw new ClassGenException("Invalid type: void[]");

  default: // Basic type or reference
    this.dimensions = dimensions;
    basic_type = type;
    break;
  }

  StringBuffer buf = new StringBuffer();
  for(int i=0; i < this.dimensions; i++)
    buf.append('[');

  buf.append(basic_type.getSignature());

  signature = buf.toString();
}
 

/**
 * Convert signature to a Type object.
 * @param signature signature string such as Ljava/lang/String;
 * @return type object
 */
public static final Type getType(String signature)
  throws StringIndexOutOfBoundsException
{
  byte type = Utility.typeOfSignature(signature);

  if(type <= Constants.T_VOID) {
    consumed_chars = 1;
    return BasicType.getType(type);
  } else if(type == Constants.T_ARRAY) {
    int dim=0;
    do { // Count dimensions
      dim++;
    } while(signature.charAt(dim) == '[');

    // Recurse, but just once, if the signature is ok
    Type t = getType(signature.substring(dim));

    consumed_chars += dim; // update counter

    return new ArrayType(t, dim);
  } else { // type == T_REFERENCE
    int index = signature.indexOf(';'); // Look for closing `;'

    if(index < 0)
      throw new ClassFormatException("Invalid signature: " + signature);

    consumed_chars = index + 1; // "Lblabla;" `L' and `;' are removed

    return new ObjectType(signature.substring(1, index).replace('/', '.'));
  }
}