// Called on run button click
// 1. Assembles program (exits if error)
// 2. Reads "constant" variables from textboxes
// 3. Allocates new memory
// 4. Creates cpu object with memory reference and constants
// 5. Runs program on new thread
private void RunProgram_Click(object sender, EventArgs e)
{
// Do not allow run to be clicked if program running
if (sim != null)
{
return;
}
ProgramOutput.Clear();
// Maximum number of bytes in memory
MAX_BYTES = UInt32.Parse(MaxBytesTB.Text);
// Assembles program
// Displays error message and returns if unsuccessful
if (!Assembler.Assemble(ProgramData.Lines, MAX_BYTES))
{
ProgramOutput.Text = Assembler.GetAsmInfo();
ProgramOutput.Text += Environment.NewLine + "Could not assemble program.";
return;
}
// Load program from assembler
pgm = Assembler.GetProgram();
ProgramOutput.Text = "Program assembled successfully. " + (MAX_BYTES - Assembler.GetBytesUsed()) + " bytes free." + Environment.NewLine;
// How many instructions to execute before termination
int insnCount = Int32.Parse(MaxInsnsTB.Text);
// Delay in milliseconds between each instruction
int delay = Int32.Parse(InsnDelayTB.Text);
// Create new memory for the CPU
// Initialize it with the created program
// and max ram address space
mem = new Memory(pgm, MAX_BYTES);
// Create a new cpu simulation
// Initialize it with the created memory
cpu = new EaterIsa(ref mem, ref OutputRegTB, insnCount, delay);
// Create new thread for program
// This allows user to still use buttons
// and text areas
sim = new Thread(start);
// Execute the program on a new thread
sim.Start();
sim = null;
}