Java Code Examples for org.apache.bcel.Constants#T_INT

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);
   }
 }
 

/**
 * Create binary operation for simple basic types, such as int and float.
 *
 * @param op operation, such as "+", "*", "<<", etc.
 */
public static ArithmeticInstruction createBinaryOperation(String op, Type type) {
  char first = op.toCharArray()[0];

  switch(type.getType()) {
  case Constants.T_BYTE:
  case Constants.T_SHORT:
  case Constants.T_INT:
  case Constants.T_CHAR:    return createBinaryIntOp(first, op);
  case Constants.T_LONG:    return createBinaryLongOp(first, op);
  case Constants.T_FLOAT:   return createBinaryFloatOp(first);
  case Constants.T_DOUBLE:  return createBinaryDoubleOp(first);
  default:        throw new RuntimeException("Invalid type " + type);
  }
}
 

/** Create conversion operation for two stack operands, this may be an I2C, instruction, e.g.,
  * if the operands are basic types and CHECKCAST if they are reference types.
  */
 public Instruction createCast(Type src_type, Type dest_type) {
   if((src_type instanceof BasicType) && (dest_type instanceof BasicType)) {
     byte dest = dest_type.getType();
     byte src  = src_type.getType();

     if(dest == Constants.T_LONG && (src == Constants.T_CHAR || src == Constants.T_BYTE ||
			      src == Constants.T_SHORT))
src = Constants.T_INT;

     String[] short_names = { "C", "F", "D", "B", "S", "I", "L" };

     String name = "org.apache.bcel.generic." + short_names[src - Constants.T_CHAR] +
"2" + short_names[dest - Constants.T_CHAR];
     
     Instruction i = null;
     try {
i = (Instruction) Class.forName(name).newInstance();
     } catch(Exception e) {
throw new RuntimeException("Could not find instruction: " + name);
     }

     return i;
   } else if((src_type instanceof ReferenceType) && (dest_type instanceof ReferenceType)) {
     if(dest_type instanceof ArrayType)
return new CHECKCAST(cp.addArrayClass((ArrayType)dest_type));
     else
return new CHECKCAST(cp.addClass(((ObjectType)dest_type).getClassName()));
   }
   else
     throw new RuntimeException("Can not cast " + src_type + " to " + dest_type);
 }