virtualmachine.h

这是一个linux下的Shell.有命令历史和命令提示

//The Virtual Machine is a virtual machine where  the program of programable  
///lover run
const int TEXT_SIZE      =  1024;
const int STACK_SIZE     =  1024;
const int GLOBL_SIZE =  1024;

const char ADD             = 1;
const char SUB             = 2;
const char MUL             = 3;
const char DIV             = 4;
const char EQUAL           = 6;
const char BELOV		   = 7;
const char BELOWEQUAL	   = 8;	
const char ABOVE           = 9;
const char ABOVEEQUAL      = 10;

const char CALL            = 11;
const char RJMP			   = 12;
const char JMP			   = 13;
const char MOV			   = 14;



class VirtualMachine
{
public:
	VirtualMachine(void);
	~VirtualMachine(void);
	int run(void);
private:
	void stack_err(void);
	void seg_err(void);
	bool add(int, int);
	bool sub(int, int);
	bool mul(int, int);
	bool div(int, int);
	bool equal(int, int);
	bool below(int, int);
	bool belowequal(int, int);
	bool above(int, int );
	bool aboveequal(int, int);
	bool isAddrLegal(int index);
	int res_;
	int pc_;
	int bp_;
	int sp_;
	char text[TEXT_SIZE];
	int stack[STACK_SIZE];
	int globl[GLOBL_SIZE];
	bool diverr;
};