public void DoNextInstruction()
{
if (IsFinished)
{
return;
}
string command = m_realMachine.ReadMem(PagesTable.GetPhysicalAddress(PC)).GetString().TrimStart();
PC++;
if (command.StartsWith(Commands.ADD.ToString()))
{
DoAdd();
return;
}
if (command.StartsWith(Commands.SUB.ToString()))
{
DoSub();
return;
}
if (command.StartsWith(Commands.CMP.ToString()))
{
DoCmp();
return;
}
if (command.StartsWith(Commands.MUL.ToString()))
{
DoMul();
return;
}
if (command.StartsWith(Commands.DIV.ToString()))
{
DoDiv();
return;
}
if (command.StartsWith(Commands.WR.ToString()))
{
DoWR(command);
return;
}
if (command.StartsWith(Commands.RD.ToString()))
{
DoRd(command);
return;
}
if (command.StartsWith(Commands.LD.ToString()))
{
DoLD(command);
return;
}
if (command.StartsWith(Commands.PT.ToString()))
{
DoPT(command);
return;
}
if (command.StartsWith(Commands.JP.ToString()))
{
DoJp(command);
return;
}
if (command.StartsWith(Commands.JE.ToString()))
{
DoJe(command);
return;
}
if (command.StartsWith(Commands.JL.ToString()))
{
DoJL(command);
return;
}
if (command.StartsWith(Commands.JG.ToString()))
{
DoJG(command);
return;
}
if (command.StartsWith(Commands.FORK.ToString()))
{
DoFork();
return;
}
// flush stack - removes one element from stack
if (command.StartsWith(Commands.FLUS.ToString()))
{
DoFlus();
return;
}
if (command.StartsWith(Commands.COPY.ToString()))
{
DoCopy();
return;
}
if (command.StartsWith(Commands.STOP.ToString()))
{
DoStop();
return;
}
//print symbol
if (command.StartsWith(Commands.PRTS.ToString()))
{
DoPRTS();
return;
}
//print number
if (command.StartsWith(Commands.PRTN.ToString()))
{
DoPRTN();
return;
}
//prints until & symbol is found - print buffer
if (command.StartsWith(Commands.PF.ToString()))
{
DoPF(command);
return;
}
//stack data address
if (command.StartsWith(Commands.DA.ToString()))
{
DoDA(command);
return;
}
//STACK DATA
if (command.StartsWith(Commands.SD.ToString()))
{
DoSD(command);
return;
}
//PUSH
if (command.StartsWith(Commands.PS.ToString()))
{
DoPs(command);
return;
}
if (String.IsNullOrWhiteSpace(command))
{
throw new ProgramContractException("Command instruction is blank line");
}
throw new ProgramContractException("Cound not find instruction: " + command);
}
private Word ReadMem(int virtualAddress)
{
return(m_realMachine.ReadMem(PagesTable.GetPhysicalAddress(virtualAddress)));
}
private void WriteMem(int virtualAddress, Word word)
{
m_realMachine.WriteMem(PagesTable.GetPhysicalAddress(virtualAddress), word);
}
//Loads program (file) to memory and checks if program is good
public void LoadProgramToMemmory(string programFilePath)
{
StreamReader file = new StreamReader(@programFilePath);
try
{
//first line must be $AMJ
var line = file.ReadLine();
checkLine(line);
if (!line.ToUpper().Equals(Settings.Default.ProgramCodeStartSymbol))
{
throw new ProgramContractException("Program must start with $AMJ sign");
}
line = file.ReadLine();
checkLine(line);
Name = line;
int programPointer = 0;
var maxProgramPointerValue = Settings.Default.ProgramSegmentPagesCount * Settings.Default.PageSize - 1;
bool stopReadingProgramCode = false;
do
{
line = file.ReadLine();
checkLine(line);
if (programPointer > maxProgramPointerValue)
{
throw new ProgramContractException("Program's code is too long!");
}
if (!line.ToUpper().Equals(Settings.Default.ProgramDataStartSymbol))
{
var physicalAddress = PagesTable.GetPhysicalAddress(programPointer);
m_realMachine.WriteMem(physicalAddress, new Word(line));
}
else
{
stopReadingProgramCode = true;
}
programPointer++;
} while (!stopReadingProgramCode);
var dataPointer = maxProgramPointerValue + 1;
var maxDataPointerValue = dataPointer + Settings.Default.DataSegmentPagesCount * Settings.Default.PageSize;
var stopReadingDataCode = false;
do
{
line = file.ReadLine();
checkLine(line);
if (dataPointer > maxDataPointerValue)
{
throw new ProgramContractException("Data code is too long!");
}
if (!line.ToUpper().Equals(Settings.Default.ProgramEndSymbol))
{
m_realMachine.WriteMem(PagesTable.GetPhysicalAddress(dataPointer), new Word(line));
}
else
{
stopReadingDataCode = true;
}
dataPointer++;
} while (!stopReadingDataCode);
}
catch (Exception e)
{
PagesTable.DeallocateAllPages();
throw;
}
finally
{
file.Close();
}
}
