public StackFrame(int numberArguments)
{
offset = new NewStackFrame(0, numberArguments);
}
public string Generate(Tacs tacs)
{
var symbolTable = new Dictionary <string, object>();
int lineNumber = 0;
var sb = new StringBuilder();
StackFrame stackFrame = null;
NewStackFrame newStackFrame = null;
StackFrame calleeStackFrame = null;
int argNum = 0;
for (int index = 0; index < tacs.Count; index++)
{
var tac = tacs[index];
switch (tac.Operation)
{
case Tac.Op.Init:
// make the initial stack frame line up with the command line arguments
var numArgs = int.Parse(tac.Arg1);
stackFrame = new StackFrame(numArgs);
sb.Append(CodeTemplates.SetRegisterValue(ref lineNumber, 6, new NewStackFrame(0, numArgs).NewStackPointer));
break;
case Tac.Op.Halt:
sb.Append(CodeTemplates.Halt(ref lineNumber));
break;
case Tac.Op.BeginFunc:
symbolTable.Add(tac.Arg1, lineNumber);
stackFrame = new StackFrame(int.Parse(tac.Arg2));
sb.Append(CodeTemplates.BeginFunc(ref lineNumber, tac.Arg1));
break;
case Tac.Op.Return:
sb.Append(CodeTemplates.Return(ref lineNumber, stackFrame, tac.Arg1));
break;
case Tac.Op.EndFunc:
sb.Append(CodeTemplates.EndFunc(ref lineNumber, stackFrame, tac.Arg1));
stackFrame = null;
break;
case Tac.Op.BeginCall:
argNum = 0;
newStackFrame = new NewStackFrame(stackFrame.Address(tac.Result), int.Parse(tac.Arg2));
calleeStackFrame = new StackFrame(int.Parse(tac.Arg2));
sb.Append(CodeTemplates.BeginCall(tac.Arg1));
break;
case Tac.Op.Param:
sb.Append(CodeTemplates.Param(ref lineNumber, stackFrame, newStackFrame, tac.Arg1, argNum));
argNum++;
break;
case Tac.Op.Call:
sb.Append(CodeTemplates.Call(ref lineNumber, newStackFrame, calleeStackFrame, tac.Arg1));
newStackFrame = null;
calleeStackFrame = null;
break;
case Tac.Op.Assign:
if (tac.Arg1.StartsWith("arg") || tac.Arg1.StartsWith("t"))
{
sb.Append(CodeTemplates.AssignVariable(ref lineNumber, stackFrame, tac.Result, tac.Arg1));
}
else
{
sb.Append(CodeTemplates.AssignConst(ref lineNumber, stackFrame, tac.Result, tac.Arg1));
}
break;
case Tac.Op.Plus:
sb.Append(CodeTemplates.Plus(ref lineNumber, stackFrame, tac.Arg1, tac.Arg2, tac.Result));
break;
case Tac.Op.Minus:
sb.Append(CodeTemplates.Minus(ref lineNumber, stackFrame, tac.Arg1, tac.Arg2, tac.Result));
break;
case Tac.Op.Times:
sb.Append(CodeTemplates.Times(ref lineNumber, stackFrame, tac.Arg1, tac.Arg2, tac.Result));
break;
case Tac.Op.Divide:
sb.Append(CodeTemplates.Divide(ref lineNumber, stackFrame, tac.Arg1, tac.Arg2, tac.Result));
break;
case Tac.Op.Negate:
sb.Append(CodeTemplates.Negate(ref lineNumber, stackFrame, tac.Arg2, tac.Result));
break;
case Tac.Op.PrintVariable:
sb.Append(CodeTemplates.PrintVariable(ref lineNumber, stackFrame, tac.Arg1));
break;
case Tac.Op.SetRegisterValue:
sb.Append(CodeTemplates.SetRegisterValue(ref lineNumber, int.Parse(tac.Arg1), int.Parse(tac.Arg2)));
break;
case Tac.Op.PrintValue:
sb.Append(CodeTemplates.PrintValue(ref lineNumber, tac.Arg1));
break;
case Tac.Op.PrintRegisters:
sb.Append(CodeTemplates.PrintRegisters(ref lineNumber));
break;
case Tac.Op.Goto:
sb.Append(CodeTemplates.Goto(ref lineNumber, tac.Arg1));
break;
case Tac.Op.Label:
sb.Append(CodeTemplates.Label(ref lineNumber, tac.Arg1));
break;
case Tac.Op.IfEqual:
sb.Append(CodeTemplates.IfEqual(ref lineNumber, stackFrame, tac.Arg1, tac.Arg2, tac.Result));
break;
case Tac.Op.IfLessThan:
sb.Append(CodeTemplates.IfLessThan(ref lineNumber, stackFrame, tac.Arg1, tac.Arg2, tac.Result));
break;
case Tac.Op.Not:
sb.Append(CodeTemplates.Not(ref lineNumber, stackFrame, tac.Arg2, tac.Result));
break;
case Tac.Op.IfFalse:
sb.Append(CodeTemplates.IfFalse(ref lineNumber, stackFrame, tac.Arg2, tac.Result));
break;
case Tac.Op.IfTrue:
sb.Append(CodeTemplates.IfTrue(ref lineNumber, stackFrame, tac.Arg2, tac.Result));
break;
default:
throw new ArgumentOutOfRangeException(tac.Operation.ToString());
}
}
var template = sb.ToString();
var labels = LabelFinder.FindLabels(template);
return(template.RenderFunctions(symbolTable).RenderLabels(labels));
}
