1 files changed, 68 insertions, 0 deletions
diff --git a/src/iir_chain_handling.adb b/src/iir_chain_handling.adb
new file mode 100644
index 000000000..1e70a366a
--- /dev/null
+++ b/src/iir_chain_handling.adb
@@ -0,0 +1,68 @@
+--  Generic package to handle chains.
+--  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_Chain_Handling is
+   procedure Build_Init (Last : out Iir) is
+   begin
+      Last := Null_Iir;
+   end Build_Init;
+
+   procedure Build_Init (Last : out Iir; Parent : Iir)
+   is
+      El : Iir;
+   begin
+      El := Get_Chain_Start (Parent);
+      if El /= Null_Iir then
+         loop
+            Last := El;
+            El := Get_Chain (El);
+            exit when El = Null_Iir;
+         end loop;
+      else
+         Last := Null_Iir;
+      end if;
+   end Build_Init;
+
+   procedure Append (Last : in out Iir; Parent : Iir; El : Iir) is
+   begin
+      if Last = Null_Iir then
+         Set_Chain_Start (Parent, El);
+      else
+         Set_Chain (Last, El);
+      end if;
+      Last := El;
+   end Append;
+
+   procedure Append_Subchain (Last : in out Iir; Parent : Iir; Els : Iir)
+   is
+      El : Iir;
+   begin
+      if Last = Null_Iir then
+         Set_Chain_Start (Parent, Els);
+      else
+         Set_Chain (Last, Els);
+      end if;
+      El := Els;
+      loop
+         Set_Parent (El, Parent);
+         Last := El;
+         El := Get_Chain (El);
+         exit when El = Null_Iir;
+      end loop;
+   end Append_Subchain;
+end Iir_Chain_Handling;
+