public BasicType check(BasicType p1, BasicType p2)
{
if (p1 == BasicType.Bool && p2 == BasicType.Bool)
{
return(BasicType.Bool);
}
else
{
return(null);
}
}
public static bool numeric(BasicType p)
{
if (p == BasicType.Char || p == BasicType.Int || p == BasicType.Float)
{
return(true);
}
else
{
return(false);
}
}
public BasicType dims(BasicType p)
{
match('[');
Token tok = look;
match(Tag.NUM);
match(']');
if (look.tag == '[')
{
p = dims(p);
}
return(new BasicArray(((Num)tok).value, p));
}
public void decls()
{
while (look.tag == Tag.BASIC)
{
BasicType p = type();
Token tok = look;
match(Tag.ID);
match(';');
Id id = new Id((Word)tok, p, used);
top.put(tok, id);
used += p.width;
}
}
public BasicType type()
{
BasicType p = (BasicType)look;
match(Tag.BASIC);
if (look.tag != '[')
{
return(p);
}
else
{
return(dims(p));
}
}
public BasicType check(BasicType p1, BasicType p2)
{
if (p1 is BasicArray || p2 is BasicArray)
{
return(null);
}
else if (p1 == p2)
{
return(BasicType.Bool);
}
else
{
return(null);
}
}
public BasicType check(BasicType p1, BasicType p2)
{
if (BasicType.numeric(p1) && BasicType.numeric(p2))
{
return(p2);
}
else if (p1 == BasicType.Bool && p2 == BasicType.Bool)
{
return(p2);
}
else
{
return(null);
}
}
public BasicType check(BasicType p1, BasicType p2)
{
if (p1 is BasicArray || p2 is BasicArray)
{
return(null);
}
else if (p1 == p2)
{
return(p2);
}
else if (BasicType.numeric(p1) && BasicType.numeric(p2))
{
return(p2);
}
else
{
return(null);
}
}
public static BasicType max(BasicType p1, BasicType p2)
{
if (!numeric(p1) || !numeric(p2))
{
return(null);
}
else if (p1 == BasicType.Float || p2 == BasicType.Float)
{
return(BasicType.Float);
}
else if (p1 == BasicType.Int || p2 == BasicType.Int)
{
return(BasicType.Int);
}
else
{
return(BasicType.Char);
}
}
public Access(Id a, Expr i, BasicType p) : base(new Word(Tag.INDEX, "[]"), p)
{
array = a;
index = i;
}
public Expr(Token tok, BasicType p)
{
op = tok;
type = p;
}
public Temp(BasicType p) : base(Word.temp, p)
{
number = ++count;
}
public BasicArray(int sz, BasicType p) : base(Tag.INDEX, "[]", sz * p.width)
{
size = sz;
of = p;
}
public Id(Word id, BasicType p, int b) : base(id, p)
{
offset = b;
}
public Op(Token tok, BasicType p) : base(tok, p)
{
}
public Constant(Token tok, BasicType p) : base(tok, p)
{
}
