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-- Chain handling.
-- Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
--
-- GHDL is free software; you can redistribute it and/or modify it under
-- the terms of the GNU General Public License as published by the Free
-- Software Foundation; either version 2, or (at your option) any later
-- version.
--
-- GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
-- WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with GHDL; see the file COPYING. If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-- 02111-1307, USA.
package body Iir_Chains is
function Get_Chain_Length (First : Iir) return Natural
is
Res : Natural := 0;
El : Iir := First;
begin
while El /= Null_Iir loop
Res := Res + 1;
El := Get_Chain (El);
end loop;
return Res;
end Get_Chain_Length;
procedure Sub_Chain_Init (First, Last : out Iir) is
begin
First := Null_Iir;
Last := Null_Iir;
end Sub_Chain_Init;
procedure Sub_Chain_Append (First, Last : in out Iir; El : Iir) is
begin
if First = Null_Iir then
First := El;
else
Set_Chain (Last, El);
end if;
Last := El;
end Sub_Chain_Append;
function Is_Chain_Length_One (Chain : Iir) return Boolean is
begin
return Chain /= Null_Iir and then Get_Chain (Chain) = Null_Iir;
end Is_Chain_Length_One;
procedure Insert (Last : Iir; El : Iir) is
begin
Set_Chain (El, Get_Chain (Last));
Set_Chain (Last, El);
end Insert;
procedure Insert_Incr (Last : in out Iir; El : Iir) is
begin
Set_Chain (El, Get_Chain (Last));
Set_Chain (Last, El);
Last := El;
end Insert_Incr;
end Iir_Chains;
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