ocarina-backends-pn-components.adb 135 KB
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------------------------------------------------------------------------------
--                                                                          --
--                           OCARINA COMPONENTS                             --
--                                                                          --
--       O C A R I N A . B A C K E N D S . P N . C O M P O N E N T S        --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
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--    Copyright (C) 2008-2009 Telecom ParisTech, 2010-2014 ESA & ISAE.      --
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--                                                                          --
-- Ocarina  is free software;  you  can  redistribute  it and/or  modify    --
-- it under terms of the GNU General Public License as published by the     --
-- Free Software Foundation; either version 2, or (at your option) any      --
-- later version. Ocarina 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 distributed with Ocarina; see file COPYING.   --
-- If not, write to the Free Software Foundation, 51 Franklin Street, Fifth --
-- Floor, Boston, MA 02111-1301, USA.                                       --
--                                                                          --
-- As a special exception,  if other files  instantiate  generics from this --
-- unit, or you link  this unit with other files  to produce an executable, --
-- this  unit  does not  by itself cause  the resulting  executable to be   --
-- covered  by the  GNU  General  Public  License. This exception does not  --
-- however invalidate  any other reasons why the executable file might be   --
-- covered by the GNU Public License.                                       --
--                                                                          --
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--                 Ocarina is maintained by the TASTE project               --
--                      (taste-users@lists.tuxfamily.org)                   --
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--                                                                          --
------------------------------------------------------------------------------

with Ocarina.ME_AADL;
with Ocarina.ME_AADL.AADL_Instances.Nodes;
with Namet;
with Ocarina.Backends.PN.Nodes;
with Ocarina.Backends.PN.Nutils;

with Ocarina.ME_AADL.AADL_Instances.Entities;
with Ocarina.ME_AADL.AADL_Instances.Nutils;

with Ocarina.Backends.Properties;
with Ocarina.AADL_Values;
with Ocarina.Instances.Queries;
with Ocarina.Backends.PN.Iutils;
with Ocarina.Backends.PN.Utils;
with Ocarina.Backends.Messages;       use Ocarina.Backends.Messages;

with Ocarina.Backends.Utils;

with Ocarina.Backends.PN.Debug;

package body Ocarina.Backends.PN.Components is

   package AIN renames Ocarina.ME_AADL.AADL_Instances.Nodes;
   package OPU renames Ocarina.Backends.PN.Nutils;
   package AINU renames Ocarina.ME_AADL.AADL_Instances.Nutils;
   package OPN renames Ocarina.Backends.PN.Nodes;
   package OPND renames Ocarina.Backends.PN.Debug;

   package OAV renames Ocarina.AADL_Values;

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   procedure PN_Process_Final_System
     (PN_Generated : Node_Id;
      PN_P_Init_Proc : PN_Init_Node;
      PN_P_New_Proc  : PN_New_Node;
      PN_A_Init_Proc : PN_Init_Arc;
      PN_A_New_Proc  : PN_New_Node;
      PN_Dup_Arc_Proc : PN_Dup_Arc);
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   function Process_Component_Instance
     (Instance : Types.Node_Id;
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      PN_Generated : Types.Node_Id)
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     return Boolean;

   function Process_Thread_Instance
     (Aadl_Instance : Types.Node_Id;
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      PN_Generated : Types.Node_Id)
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     return Boolean;

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   procedure PN_Process_Thread_Pattern
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     (Aadl_Instance : Types.Node_Id;
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      PN_Thread : Types.Node_Id;
      PN_Generated : Types.Node_Id;
      PN_P_Init_Proc : PN_Init_Node;
      PN_P_New_Proc : PN_New_Node;
      PN_T_Init_Proc : PN_Init_Node;
      PN_T_New_Proc : PN_New_Node;
      PN_A_Init_Proc : PN_Init_Arc;
      PN_A_New_Proc : PN_New_Node);

   procedure PN_Thread_Skeleton
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     (Aadl_Instance : Types.Node_Id;
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      PN_Thread : Types.Node_Id;
      PN_Generated : Types.Node_Id;
      PN_P_Init_Proc : PN_Init_Node;
      PN_P_New_Proc : PN_New_Node;
      PN_T_Init_Proc : PN_Init_Node;
      PN_T_New_Proc : PN_New_Node;
      PN_A_Init_Proc : PN_Init_Arc;
      PN_A_New_Proc : PN_New_Node);

   procedure PN_Build_Spg_Par
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     (Aadl_Instance : Types.Node_Id;
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      PN_Generated  : Types.Node_Id;
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      Spg_Feat : Types.Node_Id;
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      PN_Spg_Call : Types.Node_Id;
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      In_Par : Boolean := True;
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      PN_P_Init_Proc : PN_Init_Node;
      PN_P_New_Proc  : PN_New_Node;
      PN_T_Init_Proc : PN_Init_Node;
      PN_T_New_Proc  : PN_New_Node;
      PN_A_Init_Proc : PN_Init_Arc;
      PN_A_New_Proc  : PN_New_Node);

   procedure PN_Build_Port (Aadl_Instance : Types.Node_Id;
                            PN_Generated  : Types.Node_Id;
                            PN_Thread : Types.Node_Id;
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                            F : Types.Value_Id);

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   procedure PN_Build_Tpn_Port
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     (Aadl_Instance : Node_Id;
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      PN_Generated  : Types.Node_Id;
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      Port_Instance : Node_Id;
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      PN_Port : Node_Id;
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      Is_Data : Boolean := True);

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   procedure PN_Build_Cpn_Port
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     (Aadl_Instance : Node_Id;
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      PN_Generated  : Types.Node_Id;
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      Port_Instance : Node_Id;
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      PN_Port : Node_Id;
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      Is_Data : Boolean := True);

   -----------------------------------
   -- Process_Architecture_Instance --
   -----------------------------------

   function Process_Architecture_Instance
     (Architecture_Instance : Types.Node_Id;
      F : Unsigned_Long_Long)
     return Types.Node_Id
   is
      use Ocarina.ME_AADL.AADL_Instances.Nodes;
      use Ocarina.Backends.PN.Iutils;
      use Ocarina.ME_AADL.AADL_Instances.Nutils;
      use Ocarina.Aadl_Values;
      use Ocarina.Backends.PN.Nodes;

      Instance : Node_Id;
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      PN_Generated : Node_Id;
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      Success : Boolean := False;

      --  0 for CPN, 1 for TPN
      Formalism : constant Value_Id := New_Integer_Value (F);
   begin
      if Architecture_Instance = No_Node then
         return No_Node;
      end if;
      --  We get the root system of the AADL architecture
      Instance := Root_System (Architecture_Instance);

      --  initialization of the Petri Net top box
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      PN_Generated := PN_Get_New_PN_Generated;
      PN_Init_PN_Generated (PN_Generated,
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                            Formalism);

      declare
         F : constant Value_Type := Get_Value_Type
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           (OPN.Formalism (PN_Generated));
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      begin
         case F.Ival is
            when 0 =>
               --  CPN Pattern
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               Set_PN_Formalism_Specific_Informations
                 (PN_Generated,
                  PN_Get_New_CPN_Informations);
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               if Instance /= No_Node and then PN_Generated /= No_Node then
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                  Success := Process_Component_Instance (Instance,
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                                                         PN_Generated);
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                  if not Success then
                     return No_Node;
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                  end if;
               end if;

               --  assembly and final processing
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               PN_Process_Final_System (PN_Generated,
                                        PN_Cpn_Init_Place'Access,
                                        PN_Cpn_Get_New_Place'Access,
                                        PN_Cpn_Init_Arc'Access,
                                        PN_Cpn_Get_New_Arc'Access,
                                        PN_Cpn_Duplicate_Arc'Access);
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            when 1 =>
               --  TPN Pattern
               --  set specific informations
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               Set_PN_Formalism_Specific_Informations
                 (PN_Generated,
                  PN_Get_New_TPN_Informations);
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               if Instance /= No_Node and then PN_Generated /= No_Node then
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                  Success := Process_Component_Instance (Instance,
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                                                         PN_Generated);
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                  if not Success then
                     return No_Node;
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                  end if;
               end if;

               --  assembly and final processing
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               PN_Process_Final_System (PN_Generated,
                                        PN_Tpn_Init_Place'Access,
                                        PN_Tpn_Get_New_Place'Access,
                                        PN_Tpn_Init_Arc'Access,
                                        PN_Tpn_Get_New_Arc'Access,
                                        PN_Tpn_Duplicate_Arc'Access);
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            when others =>
               null;
         end case;
      end;

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      return PN_Generated;
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   end Process_Architecture_Instance;

   -------------------------------
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   --  PN_Process_Final_System  --
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   -------------------------------

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   procedure PN_Process_Final_System
     (PN_Generated : Node_Id;
      PN_P_Init_Proc : PN_Init_Node;
      PN_P_New_Proc  : PN_New_Node;
      PN_A_Init_Proc : PN_Init_Arc;
      PN_A_New_Proc  : PN_New_Node;
      PN_Dup_Arc_Proc : PN_Dup_Arc)
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   is
      use OPN;
      use Ocarina.Backends.PN.Nutils;
      use Namet;
      use Ocarina.Backends.Properties;
      use Ocarina.Aadl_Values;
      use Ocarina.Backends.PN.Iutils;
      use Ocarina.Backends.Utils;

      use Ocarina.ME_AADL.AADL_Instances.Entities;
      use Ocarina.ME_AADL;

      Thread_Iter : Node_Id;
   begin

      Thread_Iter := OPN.First_Node
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        (PN_Subcomponents
         (PN_Box (PN_Generated)));
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      --  run across subcomponents
      while Present (Thread_Iter) loop

         if OPN.Kind (Thread_Iter) = K_Thread_Pattern then
            --  run across threads

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            if OPN.Kind (PN_Formalism_Specific_Informations (PN_Generated))
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              = K_TPN_Specific_Informations then

               --  manage processor
               declare
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                  PN_Proc : Node_Id;
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                  Aadl_Proc : constant Node_Id
                    := Get_Bound_Processor (AIN.Corresponding_Instance
                                            (Get_Container_Process
                                             (Th_Instance
                                              (Thread_Iter))));
                  Proc_Prio_Node : Node_Id;
               begin
                  if Aadl_Proc /= No_Node then

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                     PN_Proc := Get_Handling (Aadl_Proc,
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                                              By_Node,
                                              H_PN_Proc_Creation);

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                     if PN_Proc = No_Node then
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                        --  create processor
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                        PN_Proc := PN_Get_New_Processor_Pattern;
                        PN_Init_Processor_Pattern (PN_Proc,
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                                                   Aadl_Proc);

                        --  add place in component
                        declare
                           P_Proc : Node_Id;
                        begin
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                           P_Proc := PN_Tpn_Get_New_Place;
                           PN_Tpn_Init_Place (P_Proc,
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                                              Aadl_Proc,
                                              Get_String_Name ("_Processor"),
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                                              PN_Generated,
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                                              0);

                           Set_Tokens_Number (P_Proc,
                                              New_Integer_Value (1));
                           --  add place into component
                           Append_Node_To_List (P_Proc,
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                                                Internal_Places (PN_Proc));
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                        end;

                        Set_Handling (Aadl_Proc,
                                      By_Node,
                                      H_PN_Proc_Creation,
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                                      PN_Proc);
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                        --  add processor into components list
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                        Append_Node_To_List (PN_Proc,
                                             PN_Subcomponents
                                             (PN_Box (PN_Generated)));
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                     end if;

                     --  here we have the processor component
                     --  run across spgs to update connections

                     --  first, find dedicated entry in tpn_info to update
                     --  priorities
                     if Is_Empty (Priorities
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                                  (PN_Formalism_Specific_Informations
                                   (PN_Generated))) then
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                        --  first entry in the list
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                        Proc_Prio_Node := PN_Get_New_Processor_Priority;
                        PN_Init_Processor_Priority (Proc_Prio_Node,
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                                                    Aadl_Proc);
                        Append_Node_To_List
                          (Proc_Prio_Node,
                           Priorities
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                           (PN_Formalism_Specific_Informations
                            (PN_Generated)));
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                     else
                        --  find it
                        Proc_Prio_Node := OPN.First_Node
                          (Priorities
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                           (PN_Formalism_Specific_Informations
                            (PN_Generated)));
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                        while Present (Proc_Prio_Node) loop
                           if P_Instance (Proc_Prio_Node) = Aadl_Proc then
                              --  leave loop
                              exit;
                           end if;
                           --  next
                           Proc_Prio_Node := OPN.Next_Node (Proc_Prio_Node);
                        end loop;
                     end if;
                     --  here we have proc struct
                     --  (needed to print priorities later)

                     if not Is_Empty (Call_Seq (Thread_Iter)) then
                        declare
                           Cs_Iter, Spg_Iter, Trans_Iter : Node_Id;
                           P_Proc : constant Node_Id :=
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                             OPN.First_Node (Internal_Places (PN_Proc));
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                        begin
                           Cs_Iter := OPN.First_Node (Call_Seq (Thread_Iter));
                           while Present (Cs_Iter) loop
                              if not Is_Empty (Spg_Call (Cs_Iter)) then
                                 Spg_Iter := OPN.First_Node
                                   (Spg_Call (Cs_Iter));
                                 while Present (Spg_Iter) loop
                                    --  take processor at begin
                                    --  leave it at preemp1
                                    --  take it again at preemp2
                                    --  leave it at end

                                    Trans_Iter := OPN.First_Node
                                      (Public_Interfaces (Spg_Iter));
                                    declare
                                       New_Arc : Node_Id;
                                    begin
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                                       New_Arc := PN_A_New_Proc.all;
                                       PN_A_Init_Proc (New_Arc,
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                                                       Th_Instance
                                                       (Thread_Iter),
                                                       P_Proc,
                                                       Trans_Iter,
                                                       0);

                                       Append_Node_To_List
                                         (New_Arc,
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                                          PN_Arcs_In (Trans_Iter));
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                                    end;
                                    --  since it is begin,
                                    --  its priority needs to be
                                    --  recorded
                                    Set_Priority (Trans_Iter,
                                                  New_Integer_Value
                                                  (Get_Thread_Priority
                                                   (Th_Instance
                                                    (Thread_Iter))));
                                    Append_Trans_To_Processor (Trans_Iter,
                                                               Proc_Prio_Node);
                                    -----
                                    Trans_Iter := OPN.Next_Node (Trans_Iter);
                                    declare
                                       New_Arc : Node_Id;
                                    begin
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                                       New_Arc := PN_A_New_Proc.all;
                                       PN_A_Init_Proc (New_Arc,
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                                                       Th_Instance
                                                       (Thread_Iter),
                                                       Trans_Iter,
                                                       P_Proc,
                                                       0);

                                       Append_Node_To_List
                                         (New_Arc,
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                                          PN_Arcs_Out (Trans_Iter));
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                                    end;

                                    --  handle context switch
                                    Trans_Iter := OPN.First_Node
                                      (Internal_Transitions
                                       (Spg_Iter));
                                    declare
                                       New_Arc : Node_Id;
                                    begin
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                                       New_Arc := PN_A_New_Proc.all;
                                       PN_A_Init_Proc (New_Arc,
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                                                       Th_Instance
                                                       (Thread_Iter),
                                                       Trans_Iter,
                                                       P_Proc,
                                                       0);

                                       Append_Node_To_List
                                         (New_Arc,
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                                          PN_Arcs_Out (Trans_Iter));
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                                    end;
                                    --  since it is preemp1, its priority needs
                                    --  to be recorded
                                    Set_Priority (Trans_Iter,
                                                  New_Integer_Value
                                                  (Get_Thread_Priority
                                                   (Th_Instance
                                                    (Thread_Iter))));
                                    Append_Trans_To_Processor (Trans_Iter,
                                                               Proc_Prio_Node);
                                    -----
                                    Trans_Iter := OPN.Next_Node (Trans_Iter);
                                    declare
                                       New_Arc : Node_Id;
                                    begin
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                                       New_Arc := PN_A_New_Proc.all;
                                       PN_A_Init_Proc (New_Arc,
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                                                       Th_Instance
                                                       (Thread_Iter),
                                                       P_Proc,
                                                       Trans_Iter,
                                                       0);

                                       Append_Node_To_List
                                         (New_Arc,
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                                          PN_Arcs_In (Trans_Iter));
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                                    end;

                                    --  next
                                    Spg_Iter := OPN.Next_Node (Spg_Iter);
                                 end loop;    --  spg
                              end if;         --  has spg

                              --  next
                              Cs_Iter := OPN.Next_Node (Cs_Iter);
                           end loop;          --  cs
                        end;
                     end if;                  --  has call seq
                  end if;                        --  have processor properties
               end;
            end if;                     --  tpn for processors

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            if OPN.Kind (PN_Formalism_Specific_Informations (PN_Generated))
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              = K_TPN_Specific_Informations then
               --  TPN
               --  set hyperperiod
               Set_Hyperperiod (Thread_Iter,
                                Hyperperiod
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                                (PN_Formalism_Specific_Informations
                                 (PN_Generated)));
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               --  set hyperperiod values to hyperperiod place
               declare
                  Node_Iter : Node_Id;
               begin
                  if not Is_Empty (Internal_Places (Thread_Iter)) then
                     Node_Iter := OPN.First_Node
                       (Internal_Places (Thread_Iter));
                     while Present (Node_Iter) loop

                        declare
                           S : constant String :=
                             Get_Name_String (Name (Identifier (Node_Iter)));
                           Token_Nb : Unsigned_Long_Long;
                           Hyper_Th : Value_Type;
                           Time_Th : Time_Type;
                        begin
                           if S (S'Last - 10 .. S'Last) = "Hyperperiod" then
                              if Get_Thread_Dispatch_Protocol
                                (Th_Instance (Thread_Iter)) = Thread_Periodic
                                or else
                                 Get_Thread_Dispatch_Protocol
                                (Th_Instance (Thread_Iter)) = Thread_Sporadic
                              then
                                 Time_Th := Get_Thread_Period
                                   (Th_Instance (Thread_Iter));
                                 Hyper_Th := Get_Value_Type
                                   (Hyperperiod (Thread_Iter));
                                 Token_Nb :=
                                   Hyper_Th.Ival / Time_Th.T;

                                 Set_Tokens_Number (Node_Iter,
                                                    New_Integer_Value
                                                    (Token_Nb));
                              end if;
                           end if;
                        end;

                        Node_Iter := OPN.Next_Node (Node_Iter);
                     end loop;
                  end if;               --  internal places (thread)
               end;
            end if;                     --  TPN treatments (hyperperiod)

            --  COMMON PART
            --  manage call sequences
            if Get_Thread_Implementation_Kind
              (Th_Instance (Thread_Iter))
              = Thread_With_Call_Sequence then

               --  manage port's pop / in param fusion
               declare
                  Beg_Node : Node_Id;   --  start node for CS
                  Pop_Node : Node_Id;   --  pop node for in port
                  Cs_Iter, Spg_Iter, Param_Iter : Node_Id;
               begin
                  Cs_Iter := OPN.First_Node (Call_Seq (Thread_Iter));
                  while Present (Cs_Iter) loop
                     --  run across CS
                     Spg_Iter := OPN.First_Node (Spg_Call (Cs_Iter));
                     while Present (Spg_Iter) loop
                        --  run across CS's Spg
                        Beg_Node := OPN.First_Node (Public_Interfaces
                                                    (Spg_Iter));

                        if not Is_Empty (Param_In (Spg_Iter)) then
                           Param_Iter := OPN.First_Node (Param_In (Spg_Iter));
                           while Present (Param_Iter) loop
                              --  run across CS's Spg's In param

                              --  find dedicated in port
                              declare
                                 Port_Iter : Node_Id;
                              begin
                                 if not Is_Empty (In_Ports (Thread_Iter)) then
                                    Port_Iter := OPN.First_Node
                                      (In_Ports (Thread_Iter));

                                    while Present (Port_Iter) loop
                                       --  run across in ports

                                       if not Is_Empty
                                         (Public_Interfaces (Port_Iter)) then
                                          Pop_Node := OPN.Next_Node
                                            (OPN.First_Node (Public_Interfaces
                                                             (Port_Iter)));

                                          if Port_Instance (Port_Iter) =
                                            Par_Instance (Param_Iter) then
                                             --  match
                                             --  update arcs to
                                             --  delete port's pop
                                             declare
                                                Arc_Iter : Node_Id;
                                             begin
                                                --  look at in arcs
                                                Arc_Iter := OPN.First_Node
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                                                  (PN_Arcs_In (Pop_Node));
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                                                while Present (Arc_Iter) loop

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                                                   PN_Dup_Arc_Proc.all
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                                                     (Arc_Iter,
                                                      Th_Instance
                                                      (Thread_Iter),
                                                      Beg_Node,
                                                      False);

                                                   --  next
                                                   Arc_Iter := OPN.Next_Node
                                                     (Arc_Iter);
                                                end loop;

                                                --  look at out arcs
                                                Arc_Iter := OPN.First_Node
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                                                  (PN_Arcs_Out (Pop_Node));
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                                                while Present (Arc_Iter) loop

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                                                   PN_Dup_Arc_Proc.all
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                                                     (Arc_Iter,
                                                      Th_Instance
                                                      (Thread_Iter),
                                                      Beg_Node,
                                                      True);

                                                   Arc_Iter := OPN.Next_Node
                                                     (Arc_Iter);
                                                end loop;
                                             end;
                                             --  record where is
                                             --  pop interface now
                                             --  by_node cause
                                             --  name could fail...
                                             Set_Handling (Port_Iter,
                                                           By_Node,
                                                           H_PN_Port_Creation,
                                                           Beg_Node);

                                             --  delete pop Node
                                             Delete_Node_From_List
                                               (Pop_Node,
                                                Public_Interfaces (Port_Iter));

                                          end if; --  match port / in param

                                       end if;
                                       --  next
                                       Port_Iter := OPN.Next_Node (Port_Iter);
                                    end loop;

                                 end if; --  have in ports

                              end;

                              --  next
                              Param_Iter := OPN.Next_Node (Param_Iter);
                           end loop;
                        end if;         --  have in param
                        --  next
                        Spg_Iter := OPN.Next_Node (Spg_Iter);
                     end loop;

                     --  next
                     Cs_Iter := OPN.Next_Node (Cs_Iter);
                  end loop;
               end;

               --  manage port's push / out param fusion
               declare
                  End_Node : Node_Id;   --  start node for CS
                  Push_Node : Node_Id;   --  push node for out port
                  Cs_Iter, Spg_Iter, Param_Iter : Node_Id;
               begin
                  Cs_Iter := OPN.First_Node (Call_Seq (Thread_Iter));
                  while Present (Cs_Iter) loop
                     --  run across CS
                     Spg_Iter := OPN.First_Node (Spg_Call (Cs_Iter));
                     while Present (Spg_Iter) loop
                        --  run across CS's Spg
                        End_Node := OPN.Next_Node
                          (OPN.First_Node (Public_Interfaces (Spg_Iter)));

                        if not Is_Empty (Param_Out (Spg_Iter)) then
                           Param_Iter := OPN.First_Node (Param_Out (Spg_Iter));
                           while Present (Param_Iter) loop
                              --  run across CS's Spg's Out param

                              --  find dedicated in port
                              declare
                                 Port_Iter : Node_Id;
                              begin
                                 if not Is_Empty (Out_Ports (Thread_Iter)) then
                                    Port_Iter := OPN.First_Node
                                      (Out_Ports (Thread_Iter));

                                    while Present (Port_Iter) loop
                                       --  run across in ports

                                       Push_Node := OPN.First_Node
                                         (Public_Interfaces (Port_Iter));
                                       if Push_Node /= No_Node then
                                          if Port_Instance (Port_Iter) =
                                            Par_Instance (Param_Iter) then
                                             --  match
                                             --  update arcs to
                                             --  delete port's pop
                                             declare
                                                Arc_Iter : Node_Id;
                                             begin
                                                --  look at in arcs
                                                Arc_Iter := OPN.First_Node
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                                                  (PN_Arcs_In (Push_Node));
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                                                while Present (Arc_Iter) loop

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                                                   PN_Dup_Arc_Proc.all
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                                                     (Arc_Iter,
                                                      Th_Instance
                                                      (Thread_Iter),
                                                      End_Node,
                                                      False);

                                                   --  next
                                                   Arc_Iter := OPN.Next_Node
                                                     (Arc_Iter);
                                                end loop;

                                                --  look at out arcs
                                                Arc_Iter := OPN.First_Node
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                                                  (PN_Arcs_Out (Push_Node));
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                                                while Present (Arc_Iter) loop

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                                                   PN_Dup_Arc_Proc.all
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                                                     (Arc_Iter,
                                                      Th_Instance
                                                      (Thread_Iter),
                                                      End_Node,
                                                      True);

                                                   Arc_Iter := OPN.Next_Node
                                                     (Arc_Iter);
                                                end loop;
                                             end;
                                             --  record where is
                                             --  push interface now
                                             --  by_node cause name
                                             --  could fail...
                                             if OPN.Next_Node (Spg_Iter)
                                               /= No_Node then
                                                --  push = next (begin node)
                                                --  since end will be deleted
                                                Set_Handling
                                                  (Port_Iter,
                                                   By_Node,
                                                   H_PN_Port_Creation,
                                                   OPN.First_Node
                                                   (Public_Interfaces
                                                    (OPN.Next_Node
                                                     (Spg_Iter))));
                                             else
                                                --  push = end node
                                                --  (last spg, no
                                                --  deletion)
                                                Set_Handling
                                                  (Port_Iter,
                                                   By_Node,
                                                   H_PN_Port_Creation,
                                                   End_Node);
                                             end if;

                                             --  delete push Node
                                             Delete_Node_From_List
                                               (Push_Node,
                                                Public_Interfaces (Port_Iter));

                                          end if; --  match port / out param
                                       end if;
                                       --  next
                                       Port_Iter := OPN.Next_Node (Port_Iter);
                                    end loop;

                                 end if; --  have out ports

                              end;

                              --  next
                              Param_Iter := OPN.Next_Node (Param_Iter);
                           end loop;
                        end if;         --  have out param
                        --  next
                        Spg_Iter := OPN.Next_Node (Spg_Iter);
                     end loop;

                     --  next
                     Cs_Iter := OPN.Next_Node (Cs_Iter);
                  end loop;
               end;

               --  manage CS steps fusion (end, begin (next) )
               declare
                  Cs_Iter, Spg_Iter, Spg_Next_Iter : Node_Id;
                  End_Node, Begin_Next_Node : Node_Id;
               begin
                  Cs_Iter := OPN.First_Node (Call_Seq (Thread_Iter));
                  while Present (Cs_Iter) loop
                     --  run across CS
                     Spg_Iter := OPN.First_Node (Spg_Call (Cs_Iter));
                     while Present (Spg_Iter)
                       and then Present (OPN.Next_Node (Spg_Iter)) loop
                        --  run across CS's Spg
                        Spg_Next_Iter := OPN.Next_Node (Spg_Iter);
                        End_Node := OPN.Next_Node
                          (OPN.First_Node (Public_Interfaces (Spg_Iter)));
                        Begin_Next_Node := OPN.First_Node (Public_Interfaces
                                                           (Spg_Next_Iter));

                        --  update arcs to delete spg's "end_node"
                        declare
                           Arc_Iter : Node_Id;
                        begin
                           --  look at in arcs
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                           Arc_Iter := OPN.First_Node (PN_Arcs_In (End_Node));
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                           while Present (Arc_Iter) loop

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                              PN_Dup_Arc_Proc.all
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                                (Arc_Iter,
                                 Th_Instance (Thread_Iter),
                                 Begin_Next_Node,
                                 False);

                              --  next
                              Arc_Iter := OPN.Next_Node (Arc_Iter);
                           end loop;

                           --  look at out arcs
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                           Arc_Iter := OPN.First_Node (PN_Arcs_Out (End_Node));
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                           while Present (Arc_Iter) loop

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                              PN_Dup_Arc_Proc.all
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                                (Arc_Iter,
                                 Th_Instance (Thread_Iter),
                                 Begin_Next_Node,
                                 True);

                              --  next
                              Arc_Iter := OPN.Next_Node (Arc_Iter);
                           end loop;
                        end;
                        --  delete end_node
                        Delete_Node_From_List (End_Node,
                                               Public_Interfaces (Spg_Iter));

                        --  next
                        Spg_Iter := OPN.Next_Node (Spg_Iter);
                     end loop;

                     --  next
                     Cs_Iter := OPN.Next_Node (Cs_Iter);
                  end loop;
               end;

            end if;                     --  thread with CS kind

            --  here, we have compact compute box
            --  manage dispatch

            if Get_Thread_Dispatch_Protocol
              (Th_Instance (Thread_Iter)) = Thread_Aperiodic
              or else
              Get_Thread_Dispatch_Protocol
              (Th_Instance (Thread_Iter)) = Thread_Sporadic then

               declare
                  Wait_Node : Node_Id;
                  Port_Iter : Node_Id;
                  Pop_Node : Node_Id;
               begin
                  --  connect wait_dispatch to each port's pop interface
                  --  since any port could trigger the dispatch
                  --  (in case of port_compute_entrypoint)
                  if not Is_Empty (In_Ports (Thread_Iter)) then
                     Port_Iter := OPN.First_Node (In_Ports (Thread_Iter));

                     Wait_Node := OPN.Next_Node (First_Node (Internal_Places
                                                             (Thread_Iter)));

                     while Present (Port_Iter) loop
                        --  run across in ports
                        Pop_Node := Get_Handling (Port_Iter,
                                                  By_Node,
                                                  H_PN_Port_Creation);
                        if Pop_Node = No_Node then
                           --  this port have not been merged into a param
                           Pop_Node := OPN.Next_Node (OPN.First_Node
                                                      (Public_Interfaces
                                                       (Port_Iter)));
                        end if;

                        --  here, we have the port's pop interface
                        declare
                           New_Arc : Node_Id;
                        begin
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                           New_Arc := PN_A_New_Proc.all;
                           PN_A_Init_Proc (New_Arc,
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                                           Th_Instance (Thread_Iter),
                                           Wait_Node,
                                           Pop_Node,
                                           1);

                           Append_Node_To_List (New_Arc,
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                                                PN_Arcs_In
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                                                (Pop_Node));
                        end;

                        --  next
                        Port_Iter := OPN.Next_Node (Port_Iter);
                     end loop;
                  end if;
               end;

            end if;                     --  aperiodic or sporadic thread

            --  manage clock for periodic or sporadic

            if Get_Thread_Dispatch_Protocol
              (Th_Instance (Thread_Iter)) = Thread_Periodic then
               --  manage periodic
               declare
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                  Beg_Node : Node_Id := No_Node;
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                  Wait_Node : Node_Id;
                  Clock_Node : Node_Id;
                  Node_Iter : Node_Id;
               begin
                  --  connect wait_dispatch to first call sequence
                  --  first, find wait node
                  Wait_Node := OPN.Next_Node (First_Node (Internal_Places
                                                          (Thread_Iter)));

                  --  find clock place
                  if not Is_Empty (Internal_Places (Thread_Iter)) then

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                     if OPN.Kind (PN_Formalism_Specific_Informations
                                  (PN_Generated))
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                       = K_TPN_Specific_Informations then

                        Node_Iter := OPN.First_Node
                          (Internal_Places (Thread_Iter));
                        while Present (Node_Iter) loop

                           declare
                              S : constant String :=
                                Get_Name_String (Name
                                                 (Identifier (Node_Iter)));
                           begin
                              if S (S'Last - 4 .. S'Last) = "Clock" then
                                 Clock_Node := Node_Iter;
                              end if;
                           end;

                           Node_Iter := OPN.Next_Node (Node_Iter);
                        end loop;

                     end if;

                     --  find begin_node
                     if not Is_Empty (Call_Seq (Thread_Iter)) then

                        Node_Iter := OPN.First_Node (Call_Seq
                                                     (Thread_Iter));
                        if not Is_Empty (Spg_Call (Node_Iter)) then

                           Node_Iter := OPN.First_Node (Spg_Call
                                                        (Node_Iter));
                           if not Is_Empty (Public_Interfaces
                                            (Node_Iter)) then

                              Beg_Node := OPN.First_Node (Public_Interfaces
                                                          (Node_Iter));
                           end if;
                        end if;

                     end if;

                     --  add new arc for clock
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                     if Present (Beg_Node)
                       and then OPN.Kind (PN_Formalism_Specific_Informations
                                            (PN_Generated))
                       = K_TPN_Specific_Informations
                     then
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                        declare
                           New_Arc : Node_Id;
                        begin
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                           New_Arc := PN_Tpn_Get_New_Arc;
                           PN_Tpn_Init_Arc (New_Arc,
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                                            Th_Instance (Thread_Iter),
                                            Clock_Node,
                                            Beg_Node,
                                            0);
                           Append_Node_To_List (New_Arc,
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                                                PN_Arcs_In (Beg_Node));
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                        end;
                     end if;

                     --  add new arc for wait node
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                     if Present (Beg_Node) then
                        declare
                           New_Arc : Node_Id;
                        begin
                           New_Arc := PN_A_New_Proc.all;
                           PN_A_Init_Proc (New_Arc,
                                           Th_Instance (Thread_Iter),
                                           Wait_Node,
                                           Beg_Node,
                                           1);
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                           Append_Node_To_List (New_Arc,
                                                PN_Arcs_In (Beg_Node));
                        end;
                     end if;               --  thread internal places for clock
                  end if;
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               end;
            end if;                     --  periodic thread clock

            --  sporadic thread clock
            if Get_Thread_Dispatch_Protocol
              (Th_Instance (Thread_Iter)) = Thread_Sporadic then
               --  manage sporadic
               declare
                  Clock_Node : Node_Id;
                  Node_Iter : Node_Id;
               begin
                  --  find clock place
                  if not Is_Empty (Internal_Places (Thread_Iter)) then
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                     if OPN.Kind (PN_Formalism_Specific_Informations
                                  (PN_Generated))
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                       = K_TPN_Specific_Informations then

                        Node_Iter := OPN.First_Node
                          (Internal_Places (Thread_Iter));
                        while Present (Node_Iter) loop

                           declare
                              S : constant String :=
                                Get_Name_String (Name (Identifier
                                                       (Node_Iter)));
                           begin
                              if S (S'Last - 4 .. S'Last) = "Clock" then
                                 Clock_Node := Node_Iter;
                              end if;
                           end;

                           Node_Iter := OPN.Next_Node (Node_Iter);
                        end loop;

                        declare
                           Port_Iter : Node_Id;
                           Pop_Node : Node_Id;
                        begin
                           --  connect clock to each port's pop interface
                           --  since any port could trigger the dispatch
                           if not Is_Empty (In_Ports (Thread_Iter)) then
                              Port_Iter := OPN.First_Node
                                (In_Ports (Thread_Iter));

                              while Present (Port_Iter) loop
                                 --  run across in ports
                                 Pop_Node := Get_Handling (Port_Iter,
                                                           By_Node,
                                                           H_PN_Port_Creation);
                                 if Pop_Node = No_Node then
                                    --  this port have not been merged
                                    --  into a param
                                    Pop_Node := OPN.Next_Node
                                      (OPN.First_Node
                                       (Public_Interfaces (Port_Iter)));
                                 end if;

                                 --  here, we have the port's pop interface
                                 declare
                                    New_Arc : Node_Id;
                                 begin
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                                    New_Arc := PN_Tpn_Get_New_Arc;
                                    PN_Tpn_Init_Arc (New_Arc,
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                                                     Th_Instance (Thread_Iter),
                                                     Clock_Node,
                                                     Pop_Node,
                                                     0);

                                    Append_Node_To_List
                                      (New_Arc,
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                                       PN_Arcs_In (Pop_Node));
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                                 end;

                                 --  next
                                 Port_Iter := OPN.Next_Node (Port_Iter);
                              end loop;
                           end if;
                        end;
                     end if;
                  end if;               --  find clock place
               end;
            end if;                     --  sporadic thread clock

            --  delete _compute trans from public interfaces of thread
            --  it is now useless

            Delete_Node_From_List (OPN.First_Node (Public_Interfaces
                                                   (Thread_Iter)),
                                   Public_Interfaces (Thread_Iter));

            --  now, _complete is the first node of public_interfaces

            --  manage thread interconnection adding place in pn_box
            --  here, for out ports only, and for evrey threads,
            --  we add an extra
            --  place in pn_interconnections, and connect it to pop's interface
            --  a second loop will be necessary (through in ports) to connect
            --  to in ports
            declare
               Port_Iter : Node_Id;
               Interconnection_Node : Types.Node_Id;
               Pop_Node : Node_Id;
            begin
               if not Is_Empty (Out_Ports (Thread_Iter)) then
                  Port_Iter := OPN.First_Node (Out_Ports (Thread_Iter));

                  while Present (Port_Iter) loop
                     --  create new node
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                     Interconnection_Node := PN_P_New_Proc.all;
                     PN_P_Init_Proc (Interconnection_Node,
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                                     Port_Instance (Port_Iter),
                                     Get_String_Name ("_Bus"),
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                                     PN_Generated,
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                                     0);

                     --  set handling to the target port instance
                     --  for next loop
                     Set_Handling (Interconnection_Node,
                                   By_Node,
                                   H_PN_Port_Creation,
                                   Target_Instance (Port_Iter));

                     --  add place to pn_box
                     Append_Node_To_List (Interconnection_Node,
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                                          PN_Interconnections
                                          (PN_Box (PN_Generated)));
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                     --  find pop's interface
                     if Get_Handling (Port_Iter,
                                      By_Node,
                                      H_PN_Port_Creation) /= No_Node then
                        --  this port have been merged into a param
                        Pop_Node := OPN.First_Node
                          (Public_Interfaces (Port_Iter));

                        --  CPN specific
                        --  set handling to the source port push
                        --  for next loop
                        Set_Handling (Interconnection_Node,
                                      By_Node,
                                      H_PN_Interconnection,
                                      Get_Handling (Port_Iter,
                                                    By_Node,
                                                    H_PN_Port_Creation));
                        --  end CPN specific
                     else
                        --  still two interfaces
                        Pop_Node := OPN.Next_Node (OPN.First_Node
                                                   (Public_Interfaces
                                                    (Port_Iter)));
                        --  CPN specific
                        --  set handling to the source port push
                        --  for next loop
                        Set_Handling (Interconnection_Node,
                                      By_Node,
                                      H_PN_Interconnection,
                                      OPN.First_Node (Public_Interfaces
                                                      (Port_Iter)));
                        --  end CPN specific
                     end if;

                     --  create arc
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                     if OPN.Kind (PN_Formalism_Specific_Informations
                                  (PN_Generated))
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                       = K_TPN_Specific_Informations then
                        declare
                           New_Arc : Node_Id;
                        begin
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                           New_Arc := PN_A_New_Proc.all;
                           PN_A_Init_Proc (New_Arc,
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                                           Th_Instance (Thread_Iter),
                                           Pop_Node,
                                           Interconnection_Node,
                                           2);

                           Append_Node_To_List (New_Arc,
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                                                PN_Arcs_Out (Pop_Node));
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                        end;
                     else
                        --  delete Pop
                        Delete_Node_From_List (Pop_Node,
                                               Public_Interfaces (Port_Iter));
                     end if;

                     --  next
                     Port_Iter := OPN.Next_Node (Port_Iter);
                  end loop;             --  out ports loop
               end if;                  --  have out ports
            end;                        --  run across out ports

            --  last step
            --  connect each CS "end_node" to wait_dispatch
            --  and then delete complete transition

            declare
               Complete_Node : Node_Id;
               Wait_Node : Node_Id;
               Cs_Iter, Spg_Iter : Node_Id;
               End_Node : Node_Id;
            begin
               --  find wait_node
               Wait_Node := OPN.Next_Node (OPN.First_Node (Internal_Places
                                                           (Thread_Iter)));

               --  find complete node
               --  since we already have deleted compute_trans
               --  complete_trans is first node of public_interface
               Complete_Node := OPN.First_Node (Public_Interfaces
                                                (Thread_Iter));

               if not Is_Empty (Call_Seq (Thread_Iter)) then
                  Cs_Iter := OPN.First_Node (Call_Seq (Thread_Iter));

                  while Present (Cs_Iter) loop

                     if not Is_Empty (Spg_Call (Cs_Iter)) then
                        --  last spg call
                        Spg_Iter := OPN.Last_Node (Spg_Call (Cs_Iter));
                        --  end node is last public interface of spg call
                        if not Is_Empty (Public_Interfaces (Spg_Iter)) then
                           End_Node := OPN.Last_Node (Public_Interfaces
                                                      (Spg_Iter));

                           --  make connection
                           declare
                              New_Arc : Node_Id;
                           begin
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                              New_Arc := PN_A_New_Proc.all;
                              PN_A_Init_Proc (New_Arc,
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                                              Th_Instance (Thread_Iter),
                                              End_Node,
                                              Wait_Node,
                                              1);

                              Append_Node_To_List (New_Arc,
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                                                   PN_Arcs_Out (End_Node));
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                           end;

                        end if;         --  public interface
                     end if;            --  spg call

                     --  next
                     Cs_Iter := OPN.Next_Node (Cs_Iter);
                  end loop;          --  for each CS
               end if;                  --  have cs

               --  delete complete_node
               Delete_Node_From_List (Complete_Node,
                                      Public_Interfaces (Thread_Iter));
            end;

         end if;                        --  thread subcomponent

         --  next
         Thread_Iter := OPN.Next_Node (Thread_Iter);
      end loop;                         --  next subcomponent

      -----------
      --  next loop through in ports to connect to interconnection
      --  used to merge all init_dispatch too
      Thread_Iter := OPN.First_Node
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        (PN_Subcomponents
         (PN_Box (PN_Generated)));
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      if No (Thread_Iter) then
         Display_Error ("Petri Net backend : "
                          & "incomplete AADL model", True);
      end if;

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      declare
         Init_Node : constant Node_Id
           := OPN.First_Node (Internal_Transitions (Thread_Iter));
      begin
         --  run across subcomponents
         while Present (Thread_Iter) loop

            if OPN.Kind (Thread_Iter) = K_Thread_Pattern then

               --  merge init
               if OPN.First_Node (Internal_Transitions (Thread_Iter))
                 /= Init_Node then
                  --  copy all in and out arcs
                  declare
                     Arc_Iter : Node_Id;
                     Current_Init : constant Node_Id
                       := OPN.First_Node (Internal_Transitions (Thread_Iter));
                  begin
                     --  look at in arcs
                     Arc_Iter := OPN.First_Node
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                       (PN_Arcs_In (Current_Init));
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                     while Present (Arc_Iter) loop

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                        PN_Dup_Arc_Proc.all
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                          (Arc_Iter,
                           Th_Instance (Thread_Iter),
                           Init_Node,
                           False);

                        --  next
                        Arc_Iter := OPN.Next_Node (Arc_Iter);
                     end loop;

                     --  look at out arcs
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                     Arc_Iter := OPN.First_Node (PN_Arcs_Out (Current_Init));
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                     while Present (Arc_Iter) loop

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                        PN_Dup_Arc_Proc.all
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                          (Arc_Iter,
                           Th_Instance (Thread_Iter),
                           Init_Node,
                           True);

                        --  next
                        Arc_Iter := OPN.Next_Node (Arc_Iter);
                     end loop;

                     --  delete current init transition
                     Delete_Node_From_List (Current_Init,
                                            Internal_Transitions
                                            (Thread_Iter));
                  end;
               end if;                     --  update init
            end if;                     --  thread kind

            if OPN.Kind (Thread_Iter) = K_Thread_Pattern then
               --  run across threads

               declare
                  Port_Iter, Inter_Iter : Node_Id;
                  Interconnection_Node : Node_Id := No_Node;
                  Push_Node : Node_Id;
                  Handling_Node : Node_Id;
               begin
                  if not Is_Empty (In_Ports (Thread_Iter)) then
                     Port_Iter := OPN.First_Node (In_Ports (Thread_Iter));

                     while Present (Port_Iter) loop
                        --  run through in ports

                        --  find interconnection place
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                        if not Is_Empty (PN_Interconnections
                                         (PN_Box (PN_Generated))) then
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                           Inter_Iter := OPN.First_Node
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                             (PN_Interconnections (PN_Box (PN_Generated)));
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                           while Present (Inter_Iter) loop

                              Handling_Node := Get_Handling
                                (Inter_Iter,
                                 By_Node,
                                 H_PN_Port_Creation);

                              if Handling_Node = Port_Instance (Port_Iter) then
                                 --  match : pin port = target_port (inter)
                                 Interconnection_Node := Inter_Iter;
                                 --  exit;
                              end if;

                              --  next
                              Inter_Iter := OPN.Next_Node (Inter_Iter);
                           end loop;
                        end if;

                        --  find push node
                        if not Is_Empty (Public_Interfaces (Port_Iter)) then
                           Push_Node := OPN.First_Node (Public_Interfaces
                                                        (Port_Iter));
                        end if;

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                        if OPN.Kind (PN_Formalism_Specific_Informations
                                     (PN_Generated))
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                          = K_TPN_Specific_Informations then

                           --  create arc
                           declare
                              New_Arc : Node_Id;
                           begin
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                              New_Arc := PN_A_New_Proc.all;
                              PN_A_Init_Proc (New_Arc,
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                                              Th_Instance (Thread_Iter),
                                              Interconnection_Node,
                                              Push_Node,
                                              3);

                              Append_Node_To_List (New_Arc,
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                                                   PN_Arcs_In (Push_Node));
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                           end;
                        end if;

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                        if OPN.Kind (PN_Formalism_Specific_Informations
                                     (PN_Generated))
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                          = K_CPN_Specific_Informations then
                           --  find ovf node
                           --  and connect to interconnection_node
                           declare
                              Ovf_Node : constant Node_Id
                                := OPN.Next_Node (Push_Node);
                              --  only one next
                              --  because pop has
                              --  been deleted
                              Push_Source : Node_Id;
                           begin
                              --  get push from source port
                              --  merge it with both push and ovf
                              --  delete interconnection_node
                              Push_Source := Get_Handling
                                (Interconnection_Node,
                                 By_Node,
                                 H_PN_Interconnection);
                              if Push_Source /= No_Node then
                                 declare
                                    Arc_Iter : Node_Id;
                                 begin
                                    --  look at in arcs
                                    Arc_Iter := OPN.First_Node
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                                      (PN_Arcs_In (Push_Source));
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                                    while Present (Arc_Iter) loop

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                                       PN_Dup_Arc_Proc.all
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                                         (Arc_Iter,
                                          Port_Instance (Port_Iter),
                                          Push_Node,
                                          False);

                                       --  next
                                       Arc_Iter := OPN.Next_Node (Arc_Iter);
                                    end loop;

                                    --  look at out arcs
                                    Arc_Iter := OPN.First_Node
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                                      (PN_Arcs_Out (Push_Source));
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                                    while Present (Arc_Iter) loop

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                                       PN_Dup_Arc_Proc.all
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                                         (Arc_Iter,
                                          Port_Instance (Port_Iter),
                                          Push_Node,
                                          True);

                                       --  next
                                       Arc_Iter := OPN.Next_Node (Arc_Iter);
                                    end loop;
                                 end;
                                 --  same for ovf
                                 if Ovf_Node /= No_Node then
                                    declare
                                       Arc_Iter : Node_Id;
                                    begin
                                       --  look at in arcs
                                       Arc_Iter := OPN.First_Node
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                                         (PN_Arcs_In (Push_Source));
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                                       while Present (Arc_Iter) loop

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                                          PN_Dup_Arc_Proc.all
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                                            (Arc_Iter,
                                             Port_Instance (Port_Iter),
                                             Ovf_Node,
                                             False);

                                          --  next
                                          Arc_Iter := OPN.Next_Node (Arc_Iter);
                                       end loop;

                                       --  look at out arcs
                                       Arc_Iter := OPN.First_Node
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                                         (PN_Arcs_Out (Push_Source));
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                                       while Present (Arc_Iter) loop

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                                          PN_Dup_Arc_Proc.all
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                                            (Arc_Iter,
                                             Port_Instance (Port_Iter),
                                             Ovf_Node,
                                             True);

                                          --  next
                                          Arc_Iter := OPN.Next_Node (Arc_Iter);
                                       end loop;
                                    end;
                                 end if;
                              end if;
                              --  delete interconnection_node
                              Delete_Node_From_List (Interconnection_Node,
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                                                     PN_Interconnections
                                                     (PN_Box
                                                      (PN_Generated)));
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                              --  delete push source
                              --  too complicated
                              Set_Handling (Push_Source,
                                            By_Node,
                                            H_PN_To_Delete,
                                            Port_Iter);
                              --  impact on GMA can be negleted
                           end;
                        end if;

                        --  next
                        Port_Iter := OPN.Next_Node (Port_Iter);
                     end loop;
                  end if;                  --  have in ports
               end;

            end if;                        --  thread kind

            --  next
            Thread_Iter := OPN.Next_Node (Thread_Iter);
         end loop;                         --  next subcomponent
      end;
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   end PN_Process_Final_System;
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   --------------------------------
   -- Process_Component_Instance --
   --------------------------------

   function Process_Component_Instance
     (Instance : Types.Node_Id;
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      PN_Generated : Types.Node_Id)
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     return Boolean
   is
      use Ocarina.ME_AADL.AADL_Instances.Entities;
      use Ocarina.Backends.PN.Nodes;
      use Ocarina.ME_AADL.AADL_Instances.Nodes;
      use Ocarina.ME_AADL;
      use OPU;
      use Ocarina.Backends.Properties;

      Success    : Boolean := False;
      List_Node  : Node_Id := No_Node;
   begin
      --  browse AADL instance tree
      if not AINU.Is_Empty (Subcomponents (Instance)) then

         List_Node := AIN.First_Node (Subcomponents (Instance));

         while List_Node /= No_Node loop
            case Get_Category_Of_Component
              (Corresponding_Instance (List_Node))
            is
               when CC_Process
                 | CC_System =>

                  Success := Process_Component_Instance
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                    (Corresponding_Instance (List_Node), PN_Generated)
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                    and then Success;

               when CC_Thread =>

                  Success := Process_Thread_Instance
                    (Corresponding_Instance (List_Node),
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                     PN_Generated)
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                    and then Success;
               when others =>
                  null;
            end case;

            List_Node := AIN.Next_Node (List_Node);
         end loop;
      end if;

      return Success;
   end Process_Component_Instance;

   -----------------------------
   -- Process_Thread_Instance --
   -----------------------------

   function Process_Thread_Instance
     (Aadl_Instance : Types.Node_Id;
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      PN_Generated : Types.Node_Id)
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     return Boolean
   is
      use Ocarina.Backends.PN.Nodes;
      use Ocarina.Backends.PN.Nutils;
      use Ocarina.Backends.PN.Iutils;
      use Ocarina.Aadl_Values;

      Success : constant Boolean := True;

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      PN_Thread : Node_Id;
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   begin
      --  Get a new PN thread pattern box
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      PN_Thread := PN_Get_New_Thread_Pattern;
      PN_Init_Thread_Pattern (PN_Thread,
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                              Aadl_Instance);

      --  Depending on formalism, compute thread pattern
      declare
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         F : constant Value_Type := Get_Value_Type (Formalism (PN_Generated));
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      begin
         case F.Ival is
            when 0 =>
               --  CPN Pattern
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               PN_Process_Thread_Pattern (Aadl_Instance,
                                          PN_Thread,
                                          PN_Generated,
                                          PN_Cpn_Init_Place'Access,
                                          PN_Cpn_Get_New_Place'Access,
                                          PN_Cpn_Init_Transition'Access,
                                          PN_Cpn_Get_New_Transition'Access,
                                          PN_Cpn_Init_Arc'Access,
                                          PN_Cpn_Get_New_Arc'Access);
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            when 1 =>
               --  TPN Pattern
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               PN_Process_Thread_Pattern (Aadl_Instance,
                                          PN_Thread,
                                          PN_Generated,
                                          PN_Tpn_Init_Place'Access,
                                          PN_Tpn_Get_New_Place'Access,
                                          PN_Tpn_Init_Transition'Access,
                                          PN_Tpn_Get_New_Transition'Access,
                                          PN_Tpn_Init_Arc'Access,
                                          PN_Tpn_Get_New_Arc'Access);
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            when others =>
               null;
         end case;
      end;

      --  create the standard thread pattern
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      OPU.Append_Node_To_List (PN_Thread,
                               PN_Subcomponents (PN_Box (PN_Generated)));
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      return Success;
   end Process_Thread_Instance;

   -------------------------------------
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   --  PN_Process_TPN_Thread_Pattern  --
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   -------------------------------------

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   procedure PN_Process_Thread_Pattern
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     (Aadl_Instance : Types.Node_Id;
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      PN_Thread : Types.Node_Id;
      PN_Generated : Types.Node_Id;
      PN_P_Init_Proc : PN_Init_Node;
      PN_P_New_Proc  : PN_New_Node;
      PN_T_Init_Proc : PN_Init_Node;
      PN_T_New_Proc  : PN_New_Node;
      PN_A_Init_Proc : PN_Init_Arc;
      PN_A_New_Proc  : PN_New_Node)
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   is
      use Ocarina.Backends.PN.Nodes;
      use Ocarina.Backends.PN.Nutils;
      use Ocarina.Backends.PN.Iutils;
      use Ocarina.Backends.PN.Utils;
      use OAV;
      use Ocarina.Backends.Properties;
      use Namet;
      use AIN;
      use OPND;

      V_Formalism : constant Value_Type
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        := Get_Value_Type (Formalism (PN_Generated));
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   begin

      if Get_Thread_Implementation_Kind (Aadl_Instance)
        = Thread_Unknown then

         Display_Error ("Petri Net backend : "
                        & "Thread Implementation Unknown", True);
      end if;

      --  build skeleton pattern
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      PN_Thread_Skeleton (Aadl_Instance,
                          PN_Thread,
                          PN_Generated,
                          PN_P_Init_Proc,
                          PN_P_New_Proc,
                          PN_T_Init_Proc,
                          PN_T_New_Proc,
                          PN_A_Init_Proc,
                          PN_A_New_Proc);
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      -------------------------
      --  build compute pattern

      if Get_Thread_Implementation_Kind (Aadl_Instance)
        = Thread_With_Call_Sequence then

         --  browse call sequences and store them
         declare
            Cs : List_Id;
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            PN_Cs : Node_Id := No_Node;
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         begin
            --  build pn node for call sequence
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            PN_Cs := PN_Get_New_Call_Seq_Pattern;
            PN_Init_Call_Seq_Pattern (PN_Cs,
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                                      Aadl_Instance);

            if not AINU.Is_Empty (AIN.Calls (Aadl_Instance)) then
               --  get calls sequences for the instance thread
               Cs := AIN.Calls (Aadl_Instance);

               declare
                  Call_Iter : Node_Id := AIN.First_Node (Cs);
                  Spg_call : Node_Id;
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                  PN_Spg_Call : Node_Id := No_Node;
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               begin

                  while Present (Call_Iter) loop

                     if not AINU.Is_Empty
                       (AIN.Subprogram_Calls (Call_Iter)) then
                        --  get first subprogram call of the sequence
                        Spg_Call := AIN.First_Node
                          (AIN.Subprogram_Calls (Call_Iter));

                        if Present (Spg_Call) then
                           --  build Pn node for spg
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                           PN_Spg_Call := PN_Get_New_Spg_Pattern;
                           PN_Init_Spg_Pattern (PN_Spg_Call,
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                                                Aadl_Instance);
                           --  Parent_Sequence (Spg_Call));

                        end if;
                        while Present (Spg_Call) loop

                           declare
                              --  get corresponding subprogram aadl instance
                              Spg : constant Node_Id
                                := AIN.Corresponding_Instance (Spg_Call);
                           begin
                              --  check if subprogram instance has features
                              if not AINU.Is_Empty (AIN.Features (Spg)) then

                                 declare
                                    Spg_Feat : Node_Id
                                      := AIN.First_Node (AIN.Features (Spg));
                                 begin
                                    while Present (Spg_Feat) loop
                                       if AIN.Kind (Spg_Feat)
                                         = AIN.K_Parameter_Instance
                                         and then AIN.Is_Out (Spg_Feat)
                                       then

                                          --  subprogram instance
                                          --  has out parameter
                                          if AINU.Length (AIN.Destinations
                                                          (Spg_Feat)) = 0 then
                                             Display_Located_Error
                                               (AIN.Loc (Spg_Feat),
                                                "This OUT parameter "
                                                & "is not connected to"
                                                & " any destination",
                                                Fatal => True);
                                          elsif AINU.Length
                                            (AIN.Destinations (Spg_Feat)) > 1
                                          then
                                             Display_Located_Error
                                               (AIN.Loc (Spg_Feat),
                                                "This OUT parameter "
                                                & "has too many destination",
                                                Fatal => True);
                                          end if;

                                          --  Here we have an OUT parameter
                                          --  with exactly one
                                          --  destination.

                                          --  build pn node for out parameter

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                                          PN_Build_Spg_Par
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                                            (Aadl_Instance,
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                                             PN_Generated,
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                                             Spg_Feat,
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                                             PN_Spg_Call,
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                                             False,
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                                             PN_P_Init_Proc,
                                             PN_P_New_Proc,
                                             PN_T_Init_Proc,
                                             PN_T_New_Proc,
                                             PN_A_Init_Proc,
                                             PN_A_New_Proc);
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                                       elsif AIN.Kind (Spg_Feat)
                                         = AIN.K_Parameter_Instance
                                         and then AIN.Is_In (Spg_Feat)
                                       then
                                          --  subprogram instance has
                                          --  in parameter

                                          --  subprogram instance
                                          --  has in parameter

                                          if AINU.Length
                                            (AIN.Sources
                                             (Spg_Feat)) = 0 then
                                             Display_Located_Error
                                            (AIN.Loc (Spg_Feat),
                                             "This IN parameter "
                                             & "is not connected to"
                                             & " any source",
                                             Fatal => True);
                                          elsif AINU.Length
                                            (AIN.Sources
                                             (Spg_Feat)) > 1 then
                                             Display_Located_Error
                                               (AIN.Loc (Spg_Feat),
                                                "This IN parameter "
                                                & "has too many sources",
                                                Fatal => True);
                                          end if;

                                          --  Here we have an IN parameter
                                          --  with exactly one
                                          --  destination.
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                                          PN_Build_Spg_Par
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                                            (Aadl_Instance,
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                                             PN_Generated,
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                                             Spg_Feat,
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                                             PN_Spg_Call,
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                                             True,
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                                             PN_P_Init_Proc,
                                             PN_P_New_Proc,
                                             PN_T_Init_Proc,
                                             PN_T_New_Proc,
                                             PN_A_Init_Proc,
                                             PN_A_New_Proc);