C++ HOMEWORK

#include <iostream> #include <stdio.h> #include <string> #include <cstdlib> #include "VirtualMachine.h" using namespace std; int VirtualMachine::get_clock() { return clock; } void VirtualMachine::run(fstream& objectCode, fstream& in, fstream& out) { const int debug = false; int opcode, rd, i, rs, constant, addr, j; base = 0; for (limit = 0; objectCode >> mem[limit]; limit++); sr = 2; sp = msize; pc = 0; while (pc < limit) { ir = mem[pc]; pc++; opcode = (ir&0xf800)>>11; rd = (ir&0x600)>>9; i = (ir&0x100)>>8; rs = (ir&0xc0)>>6; addr = ir&0xff; constant = addr; if (ir&0x80) constant |= 0xffffff00; // if neg sign extend clock++; if (opcode == 0) { /* load loadi */ if (i) r[rd] = constant; else { r[rd] = mem[addr]; clock += 3; } } else if (opcode == 1) { /* store */ mem[addr] = r[rd]; clock += 3; } else if (opcode == 2) { /* add addi */ if (i) r[rd] = r[rd] + constant; else r[rd] = r[rd] + r[rs]; // set CARRY if (r[rd]&0x10000) sr |= 01; else sr &= 0xe; // sign extend if (r[rd]&0x8000) r[rd] |= 0xffff0000; else r[rd] &= 0xffff; } ... } else { cout << "Bad opcode = " << opcode << endl; exit(3); } if (debug) { printf("ir=%d op=%d rd=%d i=%d rs=%d const=%d addr=%d\n", ir, opcode, rd, i, rs, constant, addr); printf("r[0]=%d r[1]=%d r[2]=%d r[3]=%d pc=%d sr=%d sp=%d clock=%d\n\n", r[0], r[1], r[2], r[3], pc, sr, sp, clock); //char c; //cin>>c; } } if (debug) { for (j=0; j<limit; j++) { printf("%8d", mem[j]); if ((j%8)==7) printf("\n"); } cout << endl; } } // run