inline void cosmac_device::fetch_instruction()
{
// instruction fetch
m_op = read_opcode(R[P]);
R[P]++;
I = m_op >> 4;
N = m_op & 0x0f;
m_icount -= CLOCKS_FETCH;
m_state = COSMAC_STATE_1_EXECUTE;
}
static int read_line(Vector v){
char op[4];
char s[10];
struct Inst inst;
int res = scanf("%s %s", op, s);
if(res == EOF) return 0;
inst.op_code = read_opcode(op);
inst.x = read_value(s);
if(inst.op_code == cpy || inst.op_code == jnz){
scanf("%s", s);
inst.y = read_value(s);
}
Vector_push(v, &inst);
return 1;
}
void read_instruction()
{
instruction_t instr = {0};
// skip empty lines
if (next_token == EOL_TOKEN || next_token == EOF_TOKEN)
{
read_token();
return;
}
if (next_token == LABEL_TOKEN)
{
read_label(&instr.label);
}
else
{
instr.label = 0;
}
read_opcode(&instr.opcode);
if (next_token != EOL_TOKEN)
{
read_argument(&instr.arg1);
}
if (next_token == COMMA_TOKEN)
{
read_token();
assert(token == COMMA_TOKEN);
read_argument(&instr.arg2);
}
read_token();
if (token != EOL_TOKEN)
{
fprintf(stderr, "%s:%d: error: To much input.\n", get_scan_file(), get_scan_line());
result = -1;
recover_error();
return;
}
add_instruction(prog, instr);
}
