public string Visit(ExprAdd node)
{
if (node.AnchorToken.Category == TokenCategory.PLUS)
{
return(VisitChildren(node) + Line(Indent() + "add.ovf"));
}
else if (node.AnchorToken.Category == TokenCategory.MINUS)
{
return(VisitChildren(node) + Line(Indent() + "sub"));
}
return(node.ToString() + "\n" + VisitChildren(node));
}
protected override Expr VisitAdd(ExprAdd e)
{
return(this.VisitBinary(e, () => {
if (!e.Overflow)
{
return this.il.Create(OpCodes.Add);
}
else
{
return this.il.Create(e.IsSigned ? OpCodes.Add_Ovf : OpCodes.Add_Ovf_Un);
}
}));
}
public Node ExprAdd()
{
//‹expr-mul› < ‹op-add› ‹expr-mul› >*
var n1 = ExprMul();
while (CurrentToken == TokenCategory.PLUS || CurrentToken == TokenCategory.MINUS)
{
var n2 = new ExprAdd();
if (CurrentToken == TokenCategory.MINUS)
{
n2.AnchorToken = Expect(TokenCategory.MINUS);
}
else
{
n2.AnchorToken = Expect(TokenCategory.PLUS);
}
n2.Add(n1);
n2.Add(ExprMul());
n1 = n2;
}
return(n1);
}
protected virtual Expr VisitAdd (ExprAdd e)
{
return this.VisitCollection (e, exprs => new ExprAdd (e.MethodInfo, exprs.First (), exprs.ElementAt (1), e.Signage, e.Overflow), e.Left, e.Right);
}
public void Visit(ExprAdd node)
{
VisitChildren(node);
}
