public void Visit(IfThenElse ifthenelse)
{
var elseLabel = MakeNewLabel();
var endLabel = MakeNewLabel();
var resultVariable = MakeNewTemp();
ifthenelse.IfExpr.Accept(this);
var ifoperand = tacs.Last().Result;
tacs.Add(Tac.IfFalse(ifoperand, elseLabel));
ifthenelse.ThenExpr.Accept(this);
tacs.Add(Tac.Assign(tacs.Last().Result, resultVariable));
tacs.Add(Tac.Goto(endLabel));
tacs.Add(Tac.Label(elseLabel, resultVariable));
ifthenelse.ElseExpr.Accept(this);
tacs.Add(Tac.Assign(tacs.Last().Result, resultVariable));
tacs.Add(Tac.Label(endLabel, resultVariable));
}
public void Visit(AndOperator and)
{
var falseLabel = MakeNewLabel();
var endLabel = MakeNewLabel();
and.Left.Accept(this);
var leftOperand = tacs.Last().Result;
tacs.Add(Tac.IfFalse(leftOperand, falseLabel));
and.Right.Accept(this);
var rightOperand = tacs.Last().Result;
tacs.Add(Tac.IfFalse(rightOperand, falseLabel));
var resultVariable = MakeNewTemp();
tacs.Add(Tac.Assign("1", resultVariable));
tacs.Add(Tac.Goto(endLabel));
tacs.Add(Tac.Label(falseLabel, resultVariable));
tacs.Add(Tac.Assign("0", resultVariable));
tacs.Add(Tac.Label(endLabel, resultVariable));
}
