loader.h

run mips program using C++

#ifndef _PROGRAM_H_
#define _PROGRAM_H_

#include "structures.h"


// the assembly language program class, you are not suggested to modify it
class Program
{
public:
	unsigned int GetOPCode(const char *op);				// get the operator code by its name
	unsigned int GetFunct(const char *op);				// get the funct code of the operator
	unsigned int GetRegCode(const char *reg);			// get the register code by its name
	char*		 GetRegName(const unsigned int reg);	// get the register name by its code

	int			 LoadProgram(const char *file);			// load a program from the file to the CodeLine member
														// return the number of instructions in the program
	unsigned int LoadInstr(const unsigned int PC);		// load one instruction from CodeLine program[]
														// return the 32-bit code of the instruction

	Program();
	~Program();

private:

	void		 FixLabels(char *line);					// used for double checking the instructions with labels
	unsigned int GenerateInstr(char *line);				// translate an instruction into an 32-bit code and store
														// all the information in an item of CodeLine program[]
	int instrPos;

public:
	Reg		 RegSet[REGISTER_NUM];						// the set of all 32 registers
	Operator OPSet[INSTR_TYPE];							// the set of operators involved
	CodeLine program[MAX_INSTR_NUM];					// store the information of the program including
														//	1. the characters,		e.g. add $s0, $s0, $t1
														//  2. the 32-bit code,		e.g. 0x02098020
														//  3. the Instr structure, e.g. OP = 0,   RS = 0x10
														//								 RT = 0x9, RD = 0x10
														//								 SH = 0,   FN = 0x20
														//								 IM = 0x-1,AD = 0x-1

private:
	unsigned int instrNum;				// number of instructions in the program
	unsigned int labelNum;				// number of labels in the program, also the bound of the labelTable
	unsigned int flag;
	Label labelTable[MAX_LABEL_NUM];	// the label table storing all labels in the program
};


#endif // _PROGRAM_H_