protected (FSRIndexedMode indMode, Expression memPtr) GetDataAbsAddress(MachineOperand opernd)
{
switch (opernd)
{
case PICOperandDataMemoryAddress absmem:
if (absmem.DataTarget == PICDataAddress.Invalid)
{
throw new InvalidOperationException($"Invalid data absolute address operand.");
}
if (PICRegisters.TryGetRegister(absmem.DataTarget, out var sfrReg))
{
if (sfrReg != PICRegisterStorage.None)
{
var imode = PICRegisters.IndirectOpMode(sfrReg, out PICRegisterStorage fsr);
if (imode != FSRIndexedMode.None)
{
return(imode, binder.EnsureRegister(fsr));
}
return(imode, binder.EnsureRegister(sfrReg));
}
}
return(FSRIndexedMode.None, DataMem8(PICDataAddress.Ptr(absmem.DataTarget)));
default:
throw new InvalidOperationException($"Invalid data absolute address operand.");
}
}
protected virtual (FSRIndexedMode indMode, Expression memPtr) GetMemFileAccess(MachineOperand opernd)
{
switch (opernd)
{
case PICOperandBankedMemory bnkmem:
var offset = bnkmem.Offset;
if (PICRegisters.TryGetAlwaysAccessibleRegister(offset, out var regsrc))
{
var srciopr = PICRegisters.IndirectOpMode(regsrc, out PICRegisterStorage indsrcreg);
if (srciopr != FSRIndexedMode.None)
{
return(srciopr, binder.EnsureRegister(indsrcreg));
}
return(FSRIndexedMode.None, binder.EnsureRegister(regsrc));
}
return(FSRIndexedMode.None, DataBankMem8(Bsr, Constant.Byte(offset)));
case PICOperandRegister reg:
var iopr = PICRegisters.IndirectOpMode(reg.Register, out PICRegisterStorage indreg);
if (iopr != FSRIndexedMode.None)
{
return(iopr, binder.EnsureRegister(indreg));
}
return(iopr, binder.EnsureRegister(reg.Register));
default:
throw new InvalidOperationException($"Invalid PIC instruction's memory operand: {opernd}");
}
}
