Java Constants.T_BOOLEAN属性代码示例

private int addConstant() {
  switch(type.getType()) {
  case Constants.T_INT: case Constants.T_CHAR: case Constants.T_BYTE:
  case Constants.T_BOOLEAN: case Constants.T_SHORT:
    return cp.addInteger(((Integer)value).intValue());

  case Constants.T_FLOAT:
    return cp.addFloat(((Float)value).floatValue());

  case Constants.T_DOUBLE:
    return cp.addDouble(((Double)value).doubleValue());

  case Constants.T_LONG:
    return cp.addLong(((Long)value).longValue());

  case Constants.T_REFERENCE:
    return cp.addString(((String)value));

  default:
    throw new RuntimeException("Oops: Unhandled : " + type.getType());
  }
}
 

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);
  }
}
 

public static final BasicType getType(byte type) {
  switch(type) {
  case Constants.T_VOID:    return VOID;
  case Constants.T_BOOLEAN: return BOOLEAN;
  case Constants.T_BYTE:    return BYTE;
  case Constants.T_SHORT:   return SHORT;
  case Constants.T_CHAR:    return CHAR;
  case Constants.T_INT:     return INT;
  case Constants.T_LONG:    return LONG;
  case Constants.T_DOUBLE:  return DOUBLE;
  case Constants.T_FLOAT:   return FLOAT;

  default:
    throw new ClassGenException("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 basic types such as int, long, `void'
 *
 * @param type one of T_INT, T_BOOLEAN, ..., T_VOID
 * @see com.sun.org.apache.bcel.internal.Constants
 */
BasicType(byte type) {
  super(type, Constants.SHORT_TYPE_NAMES[type]);

  if((type < Constants.T_BOOLEAN) || (type > Constants.T_VOID))
    throw new ClassGenException("Invalid type: " + type);
}
 

/** Parse Java type such as "char", or "java.lang.String[]" and return the
 * signature in byte code format, e.g. "C" or "[Ljava/lang/String;" respectively.
 *
 * @param  type Java type
 * @return byte code signature
 */
public static String getSignature(String type) {
  StringBuffer buf        = new StringBuffer();
  char[]       chars      = type.toCharArray();
  boolean      char_found = false, delim = false;
  int          index      = -1;

loop:
  for(int i=0; i < chars.length; i++) {
    switch(chars[i]) {
    case ' ': case '\t': case '\n': case '\r': case '\f':
      if(char_found)
        delim = true;
      break;

    case '[':
      if(!char_found)
        throw new RuntimeException("Illegal type: " + type);

      index = i;
      break loop;

    default:
      char_found = true;
      if(!delim)
        buf.append(chars[i]);
    }
  }

  int brackets = 0;

  if(index > 0)
    brackets = countBrackets(type.substring(index));

  type = buf.toString();
  buf.setLength(0);

  for(int i=0; i < brackets; i++)
    buf.append('[');

  boolean found = false;

  for(int i=Constants.T_BOOLEAN; (i <= Constants.T_VOID) && !found; i++) {
    if(Constants.TYPE_NAMES[i].equals(type)) {
      found = true;
      buf.append(Constants.SHORT_TYPE_NAMES[i]);
    }
  }

  if(!found) // Class name
    buf.append('L' + type.replace('.', '/') + ';');

  return buf.toString();
}