file: filter.h


/***************************************************************************
                                                                          
                                  filter
                                filter Class                      
                                 made in C++
                                                                          
***************************************************************************/

/*
   This file contains the "class" declaration and method declarations for the
   filter class.  

   define inlined methods:
   filter::filter()  -sets up a nop instruction.        //OVERLOAD CALL: filter: filter.cc(filter), filter.h(filter)


   Revision History:
   First made by John Langford on 3/4/97
*/

/*
    Class:              filter

    Description:        This class implements a filter from arguments as short
                        int's to a fully specified opcode.

    Private Members:    unsigned short int mask; - base instruction opcode with
                           all arguments set to 0.
			vector<unsigned short int> fields - a vector that 
			         contains a list of 1 past high bits.
			error err - the error handling object.
				 
    Static Members:     none

    Base Classes:       none.

    Friend Classes:     none

    Static Members:     none

    Public Members:     none

    Constructors:       filter(unsigned short int newmask,const vector<unsigned short int>& newfields);        //OVERLOAD CALL: filter: filter.cc(filter), filter.h(filter)
                        filter();//basically creates a nop.        //OVERLOAD CALL: filter: filter.cc(filter), filter.h(filter)

    Methods:            
      public:          
      unsigned short int args(const vector<unsigned short int>& args) const;
         //given the arguments, returns an opcode with the arguments filled in.

      void printstate() const  - prints out the state of the object.  Usefull
                        for debugging.
	
   Error Handler:      err
*/
#ifndef FILTER_H
#define FILTER_H
#include <iostream.h>
#include <stl.h>
#include "error.h"

const unsigned short int maxbitfield=4096; //2^12

class filter{
private:
  unsigned short int mask;//basic instruction

  vector<unsigned short int> fields;//beginning and ending locations of fields 
  //in the opcode

  error err; // the error handling object.
public:
  filter(unsigned short int newmask,const vector<unsigned short int>& newfields);        //OVERLOAD CALL: filter: filter.cc(filter), filter.h(filter)
  filter();//basically creates a nop.        //OVERLOAD CALL: filter: filter.cc(filter), filter.h(filter)
  unsigned short int args(const vector<unsigned short int>& args) const;
  //given the arguments, returns an opcode with the arguments filled in.

  void printstate() const;
};

inline filter::filter()
{//duh
  mask=0;
}

#endif



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