public void CompareExp(CompareExp e)
{
Label TrueLabel = il.DefineLabel();
Label EndLabel = il.DefineLabel();
e.Left.Visit(this);
e.Right.Visit(this);
switch(e.Oper){
case Operator.LT:
il.Emit(OpCodes.Blt, TrueLabel);
break;
case Operator.GT:
il.Emit(OpCodes.Bgt, TrueLabel);
break;
case Operator.EQ:
il.Emit(OpCodes.Beq, TrueLabel);
break;
case Operator.LE:
il.Emit(OpCodes.Ble, TrueLabel);
break;
case Operator.GE:
il.Emit(OpCodes.Bge, TrueLabel);
break;
}
il.Emit(OpCodes.Ldc_I4_0);
il.Emit(OpCodes.Br, EndLabel);
il.MarkLabel(TrueLabel);
il.Emit(OpCodes.Ldc_I4_1);
il.MarkLabel(EndLabel);
}
public void CompareExp(CompareExp e)
{
e.Left.Visit(this);
CheckInt(e.Left);
e.Right.Visit(this);
CheckInt(e.Right);
if (e.Left.ExpType != typeof(int)){
if (e.Left is CarExp){
e.Left = new ToIntExp(e.Left);
}
else{
Console.WriteLine("Error 101: Cannot Convert expression to Int");
success = false;
}
}
if (e.Right.ExpType != typeof(int)){
if (e.Right is CarExp){
e.Right = new ToIntExp(e.Right);
}
else{
Console.WriteLine("Error 102: Connot Convert expression to Int");
success = false;
}
}
e.ExpType = typeof(bool);
}