private static IEnumerable <string> ProcessPush(Vmcmd vmcmd, Idgen idgen, string stFunc)
{
switch (vmcmd.Ksegment)
{
case Ksegment.Constant:
{
if (vmcmd.I.FIn(0, 1))
{
yield return("@SP");
yield return("AM=M+1");
yield return("A=A-1");
yield return("M={0}".StFormat(vmcmd.I));
yield break;
}
else
{
yield return("@" + vmcmd.I);
yield return("D=A"); //d = vmcmd.I
break;
}
}
case Ksegment.Local:
yield return("@LCL");
if (vmcmd.I == 0)
{
yield return("A=M");
}
else if (vmcmd.I == 1)
{
yield return("A=M+1");
}
else
{
yield return("D=M"); //d = vmcmd.I
yield return("@" + vmcmd.I);
yield return("A=D+A"); //d = vmcmd.I
}
yield return("D=M");
break;
case Ksegment.Argument:
yield return("@ARG");
if (vmcmd.I == 0)
{
yield return("A=M");
}
else if (vmcmd.I == 1)
{
yield return("A=M+1");
}
else
{
yield return("D=M"); //d = vmcmd.I
yield return("@" + vmcmd.I);
yield return("A=D+A"); //d = vmcmd.I
}
yield return("D=M");
break;
case Ksegment.This:
yield return("@THIS");
if (vmcmd.I == 0)
{
yield return("A=M");
}
else if (vmcmd.I == 1)
{
yield return("A=M+1");
}
else
{
yield return("D=M"); //d = vmcmd.I
yield return("@" + vmcmd.I);
yield return("A=D+A"); //d = vmcmd.I
}
yield return("D=M");
break;
case Ksegment.That:
yield return("@THAT");
if (vmcmd.I == 0)
{
yield return("A=M");
}
else if (vmcmd.I == 1)
{
yield return("A=M+1");
}
else
{
yield return("D=M"); //d = vmcmd.I
yield return("@" + vmcmd.I);
yield return("A=D+A"); //d = vmcmd.I
}
yield return("D=M");
break;
case Ksegment.Temp:
yield return("@R5");
if (vmcmd.I == 0)
{
;
}
else if (vmcmd.I == 1)
{
yield return("A=A+1");
}
else
{
yield return("D=A"); //d = vmcmd.I
yield return("@" + vmcmd.I);
yield return("A=D+A"); //d = vmcmd.I
}
yield return("D=M");
break;
case Ksegment.Pointer:
yield return("@THIS");
if (vmcmd.I == 0)
{
;
}
else if (vmcmd.I == 1)
{
yield return("A=A+1");
}
else
{
yield return("D=A"); //d = vmcmd.I
yield return("@" + vmcmd.I);
yield return("A=D+A"); //d = vmcmd.I
}
yield return("D=M");
break;
case Ksegment.Static:
yield return("@" + idgen.Static(vmcmd.I));
yield return("D=M");
break;
default:
throw new ArgumentOutOfRangeException();
}
yield return("@SP"); //a = &sp
yield return("AM=M+1"); //sp++
yield return("A=A-1"); //a = sp-1
yield return("M=D"); //sp[-1] = d
}
private static IEnumerable <string> ProcessPop(Vmcmd vmcmd, Idgen idgen, string stFunc)
{
if (vmcmd.Ksegment == Ksegment.Static)
{
yield return("@SP"); //a = &sp
yield return("AM=M-1"); //sp--
yield return("D=M"); //d = sp[0]
yield return("@" + idgen.Static(vmcmd.I));
yield return("M=D");
}
else if (vmcmd.I == 0)
{
yield return("@SP"); //a = &sp
yield return("AM=M-1"); //sp--
yield return("D=M"); //d = sp[0]
switch (vmcmd.Ksegment)
{
case Ksegment.Local:
yield return("@LCL");
yield return("A=M");
break;
case Ksegment.Argument:
yield return("@ARG");
yield return("A=M");
break;
case Ksegment.This:
yield return("@THIS");
yield return("A=M");
break;
case Ksegment.That:
yield return("@THAT");
yield return("A=M");
break;
case Ksegment.Temp:
yield return("@R5");
break;
case Ksegment.Pointer:
yield return("@THIS");
break;
default:
throw new ArgumentOutOfRangeException();
}
yield return("M=D");
}
else if (vmcmd.I == 1)
{
yield return("@SP"); //a = &sp
yield return("AM=M-1"); //sp--
yield return("D=M"); //d = sp[0]
switch (vmcmd.Ksegment)
{
case Ksegment.Local:
yield return("@LCL");
yield return("A=M+1");
break;
case Ksegment.Argument:
yield return("@ARG");
yield return("A=M+1");
break;
case Ksegment.This:
yield return("@THIS");
yield return("A=M+1");
break;
case Ksegment.That:
yield return("@THAT");
yield return("A=M+1");
break;
case Ksegment.Temp:
yield return("@R5");
yield return("A=A+1");
break;
case Ksegment.Pointer:
yield return("@THIS");
yield return("A=A+1");
break;
default:
throw new ArgumentOutOfRangeException();
}
yield return("M=D");
}
else
{
switch (vmcmd.Ksegment)
{
case Ksegment.Local:
yield return("@LCL");
yield return("D=M");
break;
case Ksegment.Argument:
yield return("@ARG");
yield return("D=M");
break;
case Ksegment.This:
yield return("@THIS");
yield return("D=M");
break;
case Ksegment.That:
yield return("@THAT");
yield return("D=M");
break;
case Ksegment.Temp:
yield return("@R5");
yield return("D=A");
break;
case Ksegment.Pointer:
yield return("@THIS");
yield return("D=A");
break;
default:
throw new ArgumentOutOfRangeException();
}
yield return("@" + vmcmd.I);
yield return("D=D+A");
yield return("@R13");
yield return("M=D");
yield return("@SP"); //a = &sp
yield return("AM=M-1"); //sp--
yield return("D=M"); //d = sp[0]
yield return("@R13");
yield return("A=M");
yield return("M=D");
}
}