src/register/hei_register.hpp

#pragma once

#include <hei_includes.hpp>
#include <util/hei_bit_string.hpp>

namespace libhei
{

/**
@brief An abstract class for register objects.

Purpose:  Register is an abstract base class for real and virtual registers.
A few examples of these registers are; HardwareRegister, ConstantRegister,
NotRegister, and AndRegister.  As a base class of register types, Register
creates a place where these registers can be put together like logical
building blocks.  For example, Register makes this possible:

Register * fir = new HardwareRegister(REG_ADDRESS, REG_WIDTH,
                                      CHIP_TYPE, ACCESS_RO);
Register * mask = new ConstantRegister( 0xffffffff00000000 );
Register * fir_mask = new AndRegister(fir, mask);
const BitString * bs = fir_mask->getBitString(chip);

The getBitString function (defined by each register) provides access to
the BitString that manages each register's data.  In this example bs will
contain the result of fir & mask.
*/
class Register
{
  public:

    /** @brief Pure virtual destructor. */
    virtual ~Register() = 0;

    /**
     * @brief  Provides access to the value of this register.
     * @param  i_chip Indicates which chip to access for this register.
     * @return A BitString containing the value of this register.
     */
    virtual const BitString * getBitString( const Chip & i_chip ) const = 0;
};

// Pure virtual destructor must be defined.
inline Register::~Register() {}

}//end namespace libhei