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--  Iir to ortho translator.
--  Copyright (C) 2002 - 2014 Tristan Gingold
--
--  This program is free software: you can redistribute it and/or modify
--  it under the terms of the GNU General Public License as published by
--  the Free Software Foundation, either version 2 of the License, or
--  (at your option) any later version.
--
--  This program is distributed in the hope that it will be useful,
--  but WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--  GNU General Public License for more details.
--
--  You should have received a copy of the GNU General Public License
--  along with this program.  If not, see <gnu.org/licenses>.

with Std_Names;
with Vhdl.Std_Package; use Vhdl.Std_Package;
with Vhdl.Errors; use Vhdl.Errors;
with Vhdl.Sem_Inst;
with Vhdl.Nodes_Meta;
with Vhdl.Utils; use Vhdl.Utils;
with Vhdl.Back_End;
with Trans.Chap3;
with Trans.Chap4;
with Trans.Chap5;
with Trans.Chap6;
with Trans.Chap8;
with Trans.Rtis;
with Trans.Helpers2; use Trans.Helpers2;
with Trans_Decls; use Trans_Decls;
with Translation; use Translation;

package body Trans.Chap2 is
   use Trans.Subprgs;
   use Trans.Helpers;

   procedure Elab_Package_Internal (Spec : Iir; Header : Iir);

   type Name_String_Xlat_Array is array (Name_Id range <>) of String (1 .. 4);

   --  Ortho function names are only composed of [A-Za-z0-9_].  For VHDL
   --  functions whose name is an operator symbol, we need to create a name
   --  with letters.
   Operator_String_Xlat : constant
     Name_String_Xlat_Array (Std_Names.Name_Id_Operators) :=
     (Std_Names.Name_Op_Equality => "OPEq",
      Std_Names.Name_Op_Inequality => "OPNe",
      Std_Names.Name_Op_Less => "OPLt",
      Std_Names.Name_Op_Less_Equal => "OPLe",
      Std_Names.Name_Op_Greater => "OPGt",
      Std_Names.Name_Op_Greater_Equal => "OPGe",
      Std_Names.Name_Op_Plus => "OPPl",
      Std_Names.Name_Op_Minus => "OPMi",
      Std_Names.Name_Op_Mul => "OPMu",
      Std_Names.Name_Op_Div => "OPDi",
      Std_Names.Name_Op_Exp => "OPEx",
      Std_Names.Name_Op_Concatenation => "OPCc",
      Std_Names.Name_Op_Condition => "OPCd",
      Std_Names.Name_Op_Match_Equality => "OPQe",
      Std_Names.Name_Op_Match_Inequality => "OPQi",
      Std_Names.Name_Op_Match_Less => "OPQL",
      Std_Names.Name_Op_Match_Less_Equal => "OPQl",
      Std_Names.Name_Op_Match_Greater => "OPQG",
      Std_Names.Name_Op_Match_Greater_Equal => "OPQg");

   --  Set the identifier prefix with the subprogram identifier and
   --  overload number if any.
   procedure Push_Subprg_Identifier (Spec : Iir; Mark : out Id_Mark_Type)
   is
      Id : constant Name_Id := Get_Identifier (Spec);
   begin
      --  FIXME: name_shift_operators, name_logical_operators,
      --   name_word_operators, name_mod, name_rem
      if Id in Std_Names.Name_Id_Operators then
         Push_Identifier_Prefix
           (Mark, Operator_String_Xlat (Id), Get_Overload_Number (Spec));
      else
         Push_Identifier_Prefix (Mark, Id, Get_Overload_Number (Spec));
      end if;
   end Push_Subprg_Identifier;

   --  Return the type of a subprogram interface.
   procedure Translate_Interface_Mechanism (Inter : Iir)
   is
      Spec : constant Iir := Get_Parent (Inter);
      pragma Assert (Get_Kind (Spec) in Iir_Kinds_Subprogram_Declaration);
      Info : constant Interface_Info_Acc := Get_Info (Inter);
      Tinfo : constant Type_Info_Acc := Get_Info (Get_Type (Inter));
      Mech : Call_Mechanism;
   begin
      --  Mechanism.
      case Type_Mode_Valid (Tinfo.Type_Mode) is
         when Type_Mode_Pass_By_Copy =>
            Mech := Pass_By_Copy;
         when Type_Mode_Pass_By_Address =>
            Mech := Pass_By_Address;
      end case;

      case Iir_Kinds_Interface_Object_Declaration (Get_Kind (Inter)) is
         when Iir_Kind_Interface_Constant_Declaration
            | Iir_Kind_Interface_File_Declaration =>
            Info.Interface_Mechanism (Mode_Value) := Mech;
         when Iir_Kind_Interface_Variable_Declaration =>
            if Get_Foreign_Flag (Spec)
              and then Get_Mode (Inter) in Iir_Out_Modes
            then
               Mech := Pass_By_Address;
            end if;
            Info.Interface_Mechanism (Mode_Value) := Mech;
         when Iir_Kind_Interface_Signal_Declaration =>
            Info.Interface_Mechanism (Mode_Signal) := Mech;
            --  Values are always passed by address.
            if Get_Kind (Spec) = Iir_Kind_Procedure_Declaration then
               Mech := Pass_By_Address;
            end if;
            Info.Interface_Mechanism (Mode_Value) := Mech;
         when Iir_Kind_Interface_Quantity_Declaration =>
            raise Internal_Error;
      end case;
   end Translate_Interface_Mechanism;

   function Translate_Interface_Type (Inter : Iir; Mode : Object_Kind_Type)
                                     return O_Tnode
   is
      Info : constant Interface_Info_Acc := Get_Info (Inter);
      Tinfo : constant Type_Info_Acc := Get_Info (Get_Type (Inter));
   begin
      case Info.Interface_Mechanism (Mode) is
         when Pass_By_Address =>
            return Tinfo.Ortho_Ptr_Type (Mode);
         when Pass_By_Copy =>
            return Tinfo.Ortho_Type (Mode);
      end case;
   end Translate_Interface_Type;

   procedure Translate_Subprogram_Interfaces (Spec : Iir)
   is
      Inter : Iir;
      Mark  : Id_Mark_Type;
      Info  : Subprg_Info_Acc;
      El_List : O_Element_List;
      Param_Info : Ortho_Info_Acc;
   begin
      --  Set the identifier prefix with the subprogram identifier and
      --  overload number if any.
      Push_Subprg_Identifier (Spec, Mark);

      --  Translate interface types.
      Inter := Get_Interface_Declaration_Chain (Spec);
      while Inter /= Null_Iir loop
         Chap3.Translate_Object_Subtype_Indication (Inter);
         Inter := Get_Chain (Inter);
      end loop;

      if Get_Kind (Spec) = Iir_Kind_Procedure_Declaration then
         --  Create the param record (except for foreign subprogram).
         Info := Get_Info (Spec);
         Inter := Get_Interface_Declaration_Chain (Spec);
         if (Inter /= Null_Iir or else Get_Suspend_Flag (Spec))
           and then not Get_Foreign_Flag (Spec)
         then
            Start_Record_Type (El_List);

            --  Create fields for interfaces.
            while Inter /= Null_Iir loop
               Param_Info := Add_Info (Inter, Kind_Interface);
               Translate_Interface_Mechanism (Inter);

               New_Record_Field
                 (El_List, Param_Info.Interface_Field (Mode_Value),
                  Create_Identifier_Without_Prefix (Inter),
                  Translate_Interface_Type (Inter, Mode_Value));

               if Get_Kind (Inter) = Iir_Kind_Interface_Signal_Declaration
               then
                  New_Record_Field
                    (El_List, Param_Info.Interface_Field (Mode_Signal),
                     Create_Identifier_Without_Prefix (Inter, "SIG"),
                     Translate_Interface_Type (Inter, Mode_Signal));
               end if;
               Inter := Get_Chain (Inter);
            end loop;

            if Get_Suspend_Flag (Spec) then
               New_Record_Field (El_List, Info.Subprg_State_Field,
                                 Get_Identifier ("STATE"), Ghdl_Index_Type);
               New_Record_Field (El_List, Info.Subprg_Locvars_Field,
                                 Get_Identifier ("FRAME"), Ghdl_Ptr_Type);
            end if;

            --  Declare the record type and an access to the record.
            Finish_Record_Type (El_List, Info.Subprg_Params_Type);
            New_Type_Decl (Create_Identifier ("PARAMSTYPE"),
                           Info.Subprg_Params_Type);
            Info.Subprg_Params_Ptr :=
              New_Access_Type (Info.Subprg_Params_Type);
            New_Type_Decl (Create_Identifier ("PARAMSPTR"),
                           Info.Subprg_Params_Ptr);
         else
            Info.Subprg_Params_Type := O_Tnode_Null;
            Info.Subprg_Params_Ptr := O_Tnode_Null;
         end if;
      end if;
      Pop_Identifier_Prefix (Mark);
   end Translate_Subprogram_Interfaces;

   procedure Elab_Subprogram_Interfaces (Spec : Iir)
   is
      Inter : Iir;
   begin
      --  Translate interface types.
      Inter := Get_Interface_Declaration_Chain (Spec);
      while Inter /= Null_Iir loop
         Chap3.Elab_Object_Subtype_Indication (Inter);
         Inter := Get_Chain (Inter);
      end loop;
   end Elab_Subprogram_Interfaces;

   procedure Translate_Subprogram_Declaration (Spec : Iir)
   is
      use Vhdl.Back_End;
      Info : constant Subprg_Info_Acc := Get_Info (Spec);
      Is_Func : constant Boolean :=
        Get_Kind (Spec) = Iir_Kind_Function_Declaration;
      Is_Foreign : constant Boolean := Get_Foreign_Flag (Spec);
      Inter : Iir;
      Param_Info : Ortho_Info_Acc;
      Arg_Type : O_Tnode;
      Tinfo : Type_Info_Acc;
      Interface_List : O_Inter_List;
      Mark : Id_Mark_Type;
      Rtype : Iir;
      Id : O_Ident;
      Storage : O_Storage;
      Foreign : Foreign_Info_Type;
   begin
      --  Set the identifier prefix with the subprogram identifier and
      --  overload number if any.
      Push_Subprg_Identifier (Spec, Mark);

      --  Create the subprogram identifier.
      if Is_Foreign then
         --  Special handling for foreign subprograms.
         Foreign := Translate_Foreign_Id (Spec);
         case Foreign.Kind is
            when Foreign_Unknown =>
               Id := Create_Identifier;
            when Foreign_Intrinsic =>
               Id := Create_Identifier;
            when Foreign_Vhpidirect =>
               Id := Get_Identifier
                 (Foreign.Subprg_Name (1 .. Foreign.Subprg_Len));
         end case;
         Storage := O_Storage_External;
      else
         Foreign := Foreign_Bad;
         Id := Create_Identifier;
         Storage := Global_Storage;
      end if;

      if Is_Func then
         --  If the result of a function is a composite type for ortho,
         --  the result is allocated by the caller and an access to it is
         --  given to the function.
         Rtype := Get_Return_Type (Spec);
         Info.Use_Stack2 := False;
         Tinfo := Get_Info (Rtype);

         if Is_Composite (Tinfo) then
            Start_Procedure_Decl (Interface_List, Id, Storage);
            New_Interface_Decl
              (Interface_List, Info.Res_Interface,
               Get_Identifier ("RESULT"),
               Tinfo.Ortho_Ptr_Type (Mode_Value));
            --  Furthermore, if the result type is unconstrained, the
            --  function will allocate it on a secondary stack.
            if not Is_Fully_Constrained_Type (Rtype) then
               Info.Use_Stack2 := True;
            end if;
         else
            --  Normal function.
            Start_Function_Decl
              (Interface_List, Id, Storage, Tinfo.Ortho_Type (Mode_Value));
            Info.Res_Interface := O_Dnode_Null;
         end if;
      else
         Start_Procedure_Decl (Interface_List, Id, Storage);

         if Info.Subprg_Params_Type /= O_Tnode_Null then
            New_Interface_Decl (Interface_List, Info.Res_Interface,
                                Get_Identifier ("PARAMS"),
                                Info.Subprg_Params_Ptr);
         else
            Info.Res_Interface := O_Dnode_Null;
         end if;
      end if;

      --  Instance parameter if any.
      if not Is_Foreign then
         Subprgs.Create_Subprg_Instance (Interface_List, Spec);
      end if;

      --  Translate interfaces.
      if Is_Func or else Is_Foreign then
         Inter := Get_Interface_Declaration_Chain (Spec);
         while Inter /= Null_Iir loop
            --  Create the info.
            Param_Info := Add_Info (Inter, Kind_Interface);
            Translate_Interface_Mechanism (Inter);

            Arg_Type := Translate_Interface_Type (Inter, Mode_Value);
            New_Interface_Decl
              (Interface_List, Param_Info.Interface_Decl (Mode_Value),
               Create_Identifier_Without_Prefix (Inter), Arg_Type);

            if Get_Kind (Inter) = Iir_Kind_Interface_Signal_Declaration then
               Arg_Type := Translate_Interface_Type (Inter, Mode_Signal);
               New_Interface_Decl
                 (Interface_List, Param_Info.Interface_Decl (Mode_Signal),
                  Create_Identifier_Without_Prefix (Inter, "SIG"),
                  Arg_Type);
            end if;
            Inter := Get_Chain (Inter);
         end loop;
      end if;
      Finish_Subprogram_Decl (Interface_List, Info.Subprg_Node);

      --  Call the hook for foreign subprograms.
      if Is_Foreign and then Foreign_Hook /= null then
         Foreign_Hook.all (Spec, Foreign, Info.Subprg_Node);
      end if;

      Save_Local_Identifier (Info.Subprg_Local_Id);
      Pop_Identifier_Prefix (Mark);
   end Translate_Subprogram_Declaration;

   --  Return TRUE iff subprogram specification SPEC is translated in an
   --  ortho function.
   function Is_Subprogram_Ortho_Function (Spec : Iir) return Boolean
   is
   begin
      if Get_Kind (Spec) = Iir_Kind_Procedure_Declaration then
         return False;
      end if;
      if Get_Info (Spec).Res_Interface /= O_Dnode_Null then
         return False;
      end if;
      return True;
   end Is_Subprogram_Ortho_Function;

   --  Return TRUE iif SUBPRG_BODY declares explicitly or implicitely
   --  (or even implicitely by translation) a subprogram.
   function Has_Nested_Subprograms (Subprg_Body : Iir) return Boolean
   is
      Decl  : Iir;
      Atype : Iir;
   begin
      Decl := Get_Declaration_Chain (Subprg_Body);
      while Decl /= Null_Iir loop
         case Get_Kind (Decl) is
            when Iir_Kind_Function_Declaration
               | Iir_Kind_Procedure_Declaration =>
               return True;
            when Iir_Kind_Function_Body
               | Iir_Kind_Procedure_Body =>
               --  The declaration preceed the body.
               raise Internal_Error;
            when Iir_Kind_Type_Declaration
               | Iir_Kind_Anonymous_Type_Declaration =>
               Atype := Get_Type_Definition (Decl);
               case Iir_Kinds_Type_And_Subtype_Definition (Get_Kind (Atype)) is
                  when Iir_Kinds_Scalar_Type_And_Subtype_Definition =>
                     null;
                  when Iir_Kind_Access_Type_Definition
                     | Iir_Kind_Access_Subtype_Definition =>
                     null;
                  when Iir_Kind_File_Type_Definition =>
                     return True;
                  when Iir_Kind_File_Subtype_Definition =>
                     null;
                  when Iir_Kind_Protected_Type_Declaration =>
                     --  We suppose there is at least one method.
                     return True;
                  when Iir_Kinds_Composite_Type_Definition =>
                     --  At least for "=".
                     return True;
                  when Iir_Kind_Incomplete_Type_Definition
                    | Iir_Kind_Interface_Type_Definition =>
                     null;
               end case;
            when Iir_Kind_Package_Declaration
              | Iir_Kind_Package_Body =>
               if Has_Nested_Subprograms (Decl) then
                  return True;
               end if;
            when others =>
               null;
         end case;
         Decl := Get_Chain (Decl);
      end loop;
      return False;
   end Has_Nested_Subprograms;

   procedure Translate_Subprogram_Body (Subprg : Iir)
   is
      Spec : constant Iir := Get_Subprogram_Specification (Subprg);
      Info : constant Ortho_Info_Acc := Get_Info (Spec);

      --  True if the subprogram is suspendable (can be true only for
      --  procedures).
      Has_Suspend : constant Boolean :=
        Get_Kind (Spec) = Iir_Kind_Procedure_Declaration
        and then Get_Suspend_Flag (Spec);

      --  True if the subprogram is translated to a function in ortho.
      Is_Ortho_Func  : constant Boolean := Is_Subprogram_Ortho_Function (Spec);

      Old_Subprogram : Iir;
      Mark           : Id_Mark_Type;
      Final          : Boolean;

      --  Set for a public method.  In this case, the lock must be acquired
      --  and retained.
      Is_Prot : Boolean := False;

      --  True if the body has local (nested) subprograms.
      Has_Nested : Boolean;

      Frame_Ptr_Type : O_Tnode;
      Upframe_Field  : O_Fnode;
      Upframe_Scope  : Var_Scope_Acc;

      Frame     : O_Dnode;
      Frame_Ptr : O_Dnode;

      Has_Return : Boolean;

      Prev_Subprg_Instances : Subprgs.Subprg_Instance_Stack;
   begin
      --  Do not translate body for foreign subprograms.
      if Get_Foreign_Flag (Spec) then
         return;
      end if;

      --  Check if there are nested subprograms to unnest.  In that case,
      --  a frame record is created, which is less efficient than the
      --  use of local variables.
      if Flag_Unnest_Subprograms then
         Has_Nested := Has_Nested_Subprograms (Subprg);
      else
         Has_Nested := False;
      end if;

      --  Set the identifier prefix with the subprogram identifier and
      --  overload number if any.
      Push_Subprg_Identifier (Spec, Mark);
      Restore_Local_Identifier (Info.Subprg_Local_Id);

      if Has_Nested or else Has_Suspend then
         --  Unnest subprograms.
         --  Create an instance for the local declarations.
         Push_Frame_Factory (Info.Subprg_Frame_Scope'Access, Has_Suspend);
         Add_Subprg_Instance_Field (Upframe_Field, Upframe_Scope);

         if Info.Subprg_Params_Ptr /= O_Tnode_Null then
            --  Field for the parameters structure
            Info.Subprg_Params_Var :=
              Create_Var (Create_Var_Identifier ("PARAMS"),
                          Info.Subprg_Params_Ptr);
         else
            --  Create fields for parameters.
            --  FIXME: do it only if they are referenced in nested
            --  subprograms.
            declare
               Inter      : Iir;
               Inter_Type : O_Tnode;
               Inter_Info : Inter_Info_Acc;
            begin
               Inter := Get_Interface_Declaration_Chain (Spec);
               while Inter /= Null_Iir loop
                  Inter_Info := Get_Info (Inter);
                  if Inter_Info.Interface_Decl (Mode_Value) /= O_Dnode_Null
                  then
                     Inter_Type :=
                       Translate_Interface_Type (Inter, Mode_Value);
                     Inter_Info.Interface_Field (Mode_Value) :=
                       Add_Instance_Factory_Field
                       (Create_Identifier_Without_Prefix (Inter), Inter_Type);

                     if Get_Kind (Inter)
                       = Iir_Kind_Interface_Signal_Declaration
                     then
                        Inter_Type :=
                          Translate_Interface_Type (Inter, Mode_Signal);
                        Inter_Info.Interface_Field (Mode_Signal) :=
                          Add_Instance_Factory_Field
                          (Create_Identifier_Without_Prefix (Inter, "SIG"),
                           Inter_Type);
                     end if;
                  end if;
                  Inter := Get_Chain (Inter);
               end loop;
            end;
         end if;

         Chap4.Translate_Declaration_Chain (Subprg);

         if Has_Suspend then
            --  Add declarations for statements (iterator, call) and state.
            Chap4.Translate_Statements_Chain_State_Declaration
              (Get_Sequential_Statement_Chain (Subprg),
               Info.Subprg_Locvars_Scope'Access);
            Add_Scope_Field (Wki_Locvars, Info.Subprg_Locvars_Scope);
         end if;

         Pop_Frame_Factory (Info.Subprg_Frame_Scope'Access);

         New_Type_Decl (Create_Identifier ("_FRAMETYPE"),
                        Get_Scope_Type (Info.Subprg_Frame_Scope));
         Declare_Scope_Acc
           (Info.Subprg_Frame_Scope,
            Create_Identifier ("_FRAMEPTR"), Frame_Ptr_Type);

         Rtis.Generate_Subprogram_Body (Subprg);

         --  Local frame
         Subprgs.Push_Subprg_Instance
           (Info.Subprg_Frame_Scope'Access, Frame_Ptr_Type,
            Wki_Upframe, Prev_Subprg_Instances);
         --  Link to previous frame
         Subprgs.Start_Prev_Subprg_Instance_Use_Via_Field
           (Upframe_Scope, Upframe_Field);

         Chap4.Translate_Declaration_Chain_Subprograms
           (Subprg, Subprg_Translate_Spec_And_Body);

         --  Link to previous frame
         Subprgs.Finish_Prev_Subprg_Instance_Use_Via_Field
           (Upframe_Scope, Upframe_Field);
         --  Local frame
         Subprgs.Pop_Subprg_Instance (Wki_Upframe, Prev_Subprg_Instances);
      end if;

      --  Create the body.  Add a line very early, before any statement.

      Start_Subprogram_Body (Info.Subprg_Node);
      New_Debug_Line_Stmt (Get_Line_Number (Subprg));

      Start_Subprg_Instance_Use (Spec);

      --  Variables will be created on the stack.
      Push_Local_Factory;

      --  Code has access to local (and outer) variables.
      --  FIXME: this is not necessary if Has_Nested is set
      Subprgs.Clear_Subprg_Instance (Prev_Subprg_Instances);

      --  There is a local scope for temporaries.
      Open_Local_Temp;

      if not Has_Suspend and not Has_Nested then
         Chap4.Translate_Declaration_Chain (Subprg);
         Rtis.Generate_Subprogram_Body (Subprg);
         Chap4.Translate_Declaration_Chain_Subprograms
           (Subprg, Subprg_Translate_Spec_And_Body);
      else
         New_Var_Decl (Frame_Ptr, Get_Identifier ("FRAMEPTR"),
                       O_Storage_Local, Frame_Ptr_Type);

         if Has_Suspend then
            New_Assign_Stmt
              (New_Obj (Frame_Ptr),
               New_Convert_Ov (New_Value_Selected_Acc_Value
                                 (New_Obj (Info.Res_Interface),
                                  Info.Subprg_Locvars_Field),
                               Frame_Ptr_Type));

            Chap8.State_Entry (Info);

            --  Initial state: allocate frame.
            New_Assign_Stmt
              (New_Obj (Frame_Ptr),
               Gen_Alloc
                 (Alloc_Return,
                  New_Lit
                    (New_Sizeof (Get_Scope_Type (Info.Subprg_Frame_Scope),
                                 Ghdl_Index_Type)),
                  Frame_Ptr_Type));
            New_Assign_Stmt
              (New_Selected_Acc_Value (New_Obj (Info.Res_Interface),
                                       Info.Subprg_Locvars_Field),
               New_Convert_Ov (New_Obj_Value (Frame_Ptr),
                               Ghdl_Ptr_Type));

            --  Allocate the return state.  This IS NOT AN ASSERTION as the
            --  State_Allocate function has a side-effect.
            if Chap8.State_Allocate /= Chap8.State_Return then
               raise Internal_Error;
            end if;
         else
            --  Allocate the frame by declaring a local variable.
            New_Var_Decl (Frame, Wki_Frame, O_Storage_Local,
                          Get_Scope_Type (Info.Subprg_Frame_Scope));

            New_Assign_Stmt (New_Obj (Frame_Ptr),
                             New_Address (New_Obj (Frame), Frame_Ptr_Type));
         end if;

         --  FIXME: use direct reference (ie Frame instead of Frame_Ptr)
         Set_Scope_Via_Param_Ptr (Info.Subprg_Frame_Scope, Frame_Ptr);

         --  Set UPFRAME.
         Subprgs.Set_Subprg_Instance_Field
           (Frame_Ptr, Upframe_Field, Info.Subprg_Instance);

         if Info.Subprg_Params_Type /= O_Tnode_Null then
            --  Initialize the PARAMS field
            New_Assign_Stmt (Get_Var (Info.Subprg_Params_Var),
                             New_Obj_Value (Info.Res_Interface));
            --  Do not reference the RESULT field in the subprogram body,
            --  directly reference the RESULT parameter.
            --  FIXME: has a flag (see below for parameters).
            Info.Subprg_Params_Var := Null_Var;
         end if;

         --  Copy parameters to FRAME.
         if Info.Subprg_Params_Ptr = O_Tnode_Null then
            declare
               Inter      : Iir;
               Inter_Info : Inter_Info_Acc;
            begin
               Inter := Get_Interface_Declaration_Chain (Spec);
               while Inter /= Null_Iir loop
                  Inter_Info := Get_Info (Inter);
                  for Mode in Object_Kind_Type loop
                     if Inter_Info.Interface_Decl (Mode) /= O_Dnode_Null then
                        New_Assign_Stmt
                          (New_Selected_Element
                             (New_Obj (Frame),
                              Inter_Info.Interface_Field (Mode)),
                           New_Obj_Value (Inter_Info.Interface_Decl (Mode)));

                        --  Forget the reference to the field in FRAME, so that
                        --  this subprogram will directly reference the
                        --  parameter (and not its copy in the FRAME).
                        Inter_Info.Interface_Field (Mode) := O_Fnode_Null;
                     end if;
                  end loop;
                  Inter := Get_Chain (Inter);
               end loop;
            end;
         end if;
      end if;

      Is_Prot := Is_Subprogram_Method (Spec);
      if Is_Prot then
         --  Lock the object.
         Chap3.Call_Ghdl_Protected_Procedure (Get_Method_Type (Spec),
                                              Ghdl_Protected_Enter);
      end if;

      Chap4.Elab_Declaration_Chain (Subprg, Final);

      if not Has_Suspend then
         Stack2_Release;
      end if;
      --  If finalization is required and if the subprogram is a function,
      --  create a variable for the result.
      if (Final or Is_Prot) and Is_Ortho_Func then
         New_Var_Decl
           (Info.Subprg_Result, Get_Identifier ("RESULT"),
            O_Storage_Local,
            Get_Ortho_Type (Get_Return_Type (Spec), Mode_Value));
      end if;

      --  If finalization is required, create a dummy loop around the
      --  body and convert returns into exit out of this loop.
      if not Has_Suspend and then (Final or Is_Prot) then
         Start_Loop_Stmt (Info.Subprg_Exit);
      end if;

      Old_Subprogram := Current_Subprogram;
      Current_Subprogram := Spec;
      Has_Return := Chap8.Translate_Statements_Chain_Has_Return
        (Get_Sequential_Statement_Chain (Subprg));
      Current_Subprogram := Old_Subprogram;

      if Has_Suspend or Final or Is_Prot then
         --  Create a barrier to catch missing return statement.
         if Get_Kind (Spec) = Iir_Kind_Procedure_Declaration then
            if Has_Suspend then
               Chap8.State_Jump (Chap8.State_Return);
            else
               New_Exit_Stmt (Info.Subprg_Exit);
            end if;
         else
            if not Has_Return then
               --  Missing return
               Chap6.Gen_Program_Error
                 (Subprg, Chap6.Prg_Err_Missing_Return);
            end if;
         end if;
         if Has_Suspend then
            Chap8.State_Start (Chap8.State_Return);
         else
            Finish_Loop_Stmt (Info.Subprg_Exit);
         end if;
         Chap4.Final_Declaration_Chain (Subprg, False);

         if Is_Prot then
            --  Unlock the object.
            Chap3.Call_Ghdl_Protected_Procedure (Get_Method_Type (Spec),
                                                 Ghdl_Protected_Leave);
         end if;

         if Has_Suspend then
            Chap8.State_Suspend (Chap8.State_Return);
            Chap8.State_Leave (Spec);
         end if;

         if Is_Ortho_Func then
            New_Return_Stmt (New_Obj_Value (Info.Subprg_Result));
         end if;
      else
         if Get_Kind (Spec) = Iir_Kind_Function_Declaration
           and then not Has_Return
         then
            --  Missing return
            Chap6.Gen_Program_Error
              (Subprg, Chap6.Prg_Err_Missing_Return);
         end if;
      end if;

      if Has_Nested then
         Clear_Scope (Info.Subprg_Frame_Scope);
      end if;

      Subprgs.Pop_Subprg_Instance (O_Ident_Nul, Prev_Subprg_Instances);
      Close_Local_Temp;
      Pop_Local_Factory;

      Finish_Subprg_Instance_Use (Spec);

      Finish_Subprogram_Body;

      Pop_Identifier_Prefix (Mark);
   end Translate_Subprogram_Body;

   procedure Push_Package_Instance_Factory (Spec : Iir)
   is
      Info : constant Ortho_Info_Acc := Get_Info (Spec);
   begin
      Push_Instance_Factory (Info.Package_Body_Scope'Access);
      Info.Package_Spec_Field := Add_Instance_Factory_Field
        (Get_Identifier ("SPEC"),
         Get_Scope_Type (Info.Package_Spec_Scope));
   end Push_Package_Instance_Factory;

   procedure Pop_Package_Instance_Factory (Spec : Iir)
   is
      Info : constant Ortho_Info_Acc := Get_Info (Spec);
   begin
      Pop_Instance_Factory (Info.Package_Body_Scope'Access);
   end Pop_Package_Instance_Factory;

   --  Declare elaboration routines for a package.
   procedure Create_Package_Elaborator (Info : Ortho_Info_Acc)
   is
      Interface_List : O_Inter_List;
   begin
      --  Declare elaborator for the spec.
      Start_Procedure_Decl
        (Interface_List, Create_Identifier ("ELAB_SPEC"), Global_Storage);
      Subprgs.Add_Subprg_Instance_Interfaces
        (Interface_List, Info.Package_Elab_Spec_Instance);
      Finish_Subprogram_Decl
        (Interface_List, Info.Package_Elab_Spec_Subprg);

      --  Declare elaborator for the body.
      Start_Procedure_Decl
        (Interface_List, Create_Identifier ("ELAB_BODY"), Global_Storage);
      Subprgs.Add_Subprg_Instance_Interfaces
        (Interface_List, Info.Package_Elab_Body_Instance);
      Finish_Subprogram_Decl
        (Interface_List, Info.Package_Elab_Body_Subprg);
   end Create_Package_Elaborator;

   --  Translate a non-uninstantiated package declaration.
   --  HEADER is the node containing generic and generic_map.
   procedure Translate_Package_Concrete_Common (Decl : Iir; Header : Iir)
   is
      Info : Ortho_Info_Acc;
   begin
      Info := Add_Info (Decl, Kind_Package);

      if Header /= Null_Iir then
         Chap4.Translate_Generic_Association_Chain (Header);
      end if;

      Chap4.Translate_Declaration_Chain (Decl);

      Save_Local_Identifier (Info.Package_Local_Id);
   end Translate_Package_Concrete_Common;

   procedure Translate_Package_Concrete_Unit (Decl : Iir; Header : Iir)
   is
      Info : constant Ortho_Info_Acc := Get_Info (Decl);
   begin
      Info.Package_Elab_Var := Create_Var
        (Create_Var_Identifier ("ELABORATED"), Ghdl_Bool_Type);

      --  For nested package, this will be translated when translating
      --  subprograms.
      Chap4.Translate_Declaration_Chain_Subprograms_Spec_Body (Decl);

      Create_Package_Elaborator (Info);

      if Flag_Rti then
         --  Generate RTI.
         Rtis.Generate_Unit (Decl);
      end if;

      if Global_Storage /= O_Storage_External then
         --  Create elaboration procedure for the spec
         Elab_Package_Internal (Decl, Header);
      end if;

      --  Overwrite the value written by Translate_Package_Concrete_Common.
      Save_Local_Identifier (Info.Package_Local_Id);
   end Translate_Package_Concrete_Unit;

   --  Translate a package declaration or a macro-expanded package
   --  instantiation.  HEADER is the node containing generic and generic_map.
   procedure Translate_Package_Uninst_Common (Decl : Iir; Header : Iir)
   is
      Add_Body : constant Boolean :=
        not Get_Need_Body (Decl) and then Get_Package_Body (Decl) = Null_Iir;
      Info : Ortho_Info_Acc;
   begin
      Info := Add_Info (Decl, Kind_Package);

      --  Create an instance for the spec.
      Push_Instance_Factory (Info.Package_Spec_Scope'Access);
      Chap4.Translate_Generic_Chain (Header);
      Chap4.Translate_Declaration_Chain (Decl);
      if not Is_Nested_Package (Decl) then
         Info.Package_Elab_Var := Create_Var
           (Create_Var_Identifier ("ELABORATED"), Ghdl_Bool_Type);
      end if;
      Pop_Instance_Factory (Info.Package_Spec_Scope'Access);

      --  Name the spec instance and create a pointer.
      New_Type_Decl (Create_Identifier ("SPECINSTTYPE"),
                     Get_Scope_Type (Info.Package_Spec_Scope));
      Declare_Scope_Acc (Info.Package_Spec_Scope,
                         Create_Identifier ("SPECINSTPTR"),
                         Info.Package_Spec_Ptr_Type);

      --  Create an instance and its pointer for the body.
      Chap2.Declare_Inst_Type_And_Ptr
        (Info.Package_Body_Scope'Access, Info.Package_Body_Ptr_Type);

      if Add_Body then
         --  Generic package without a body.
         --  Create an empty body instance.
         Push_Package_Instance_Factory (Decl);
         Pop_Package_Instance_Factory (Decl);
      end if;
      Save_Local_Identifier (Info.Package_Local_Id);
   end Translate_Package_Uninst_Common;

   procedure Translate_Package_Uninst_Unit (Decl : Iir; Header : Iir)
   is
      Info : constant Ortho_Info_Acc := Get_Info (Decl);
      Add_Body : constant Boolean :=
        not Get_Need_Body (Decl) and then Get_Package_Body (Decl) = Null_Iir;
      Prev_Subprg_Instance : Subprgs.Subprg_Instance_Stack;
   begin
      --  Each subprogram has a body instance argument (because subprograms
      --  body can access body declarations).
      Subprgs.Push_Subprg_Instance
        (Info.Package_Body_Scope'Access, Info.Package_Body_Ptr_Type,
         Wki_Instance, Prev_Subprg_Instance);

      --  For nested package, this will be translated when translating
      --  subprograms.
      Chap4.Translate_Declaration_Chain_Subprograms
        (Decl, Subprg_Translate_Only_Spec);

      Create_Package_Elaborator (Info);

      Subprgs.Pop_Subprg_Instance (Wki_Instance, Prev_Subprg_Instance);

      if Flag_Rti then
         --  Generate RTI.
         Rtis.Generate_Unit (Decl);
      end if;

      if Add_Body and then Global_Storage /= O_Storage_External then
         --  For nested package, this will be translated when translating
         --  subprograms.
         Set_Scope_Via_Field (Info.Package_Spec_Scope,
                              Info.Package_Spec_Field,
                              Info.Package_Body_Scope'Access);

         Chap4.Translate_Declaration_Chain_Subprograms
           (Decl, Subprg_Translate_Only_Body);

         --  Create elaboration procedure for the spec
         Elab_Package_Internal (Decl, Header);

         Clear_Scope (Info.Package_Spec_Scope);
      end if;

      Save_Local_Identifier (Info.Package_Local_Id);
   end Translate_Package_Uninst_Unit;

   procedure Translate_Package_Declaration_Subprograms
     (Decl : Iir_Package_Declaration; What : Subprg_Translate_Kind)
   is
      Info : constant Ortho_Info_Acc := Get_Info (Decl);
      Is_Uninst : constant Boolean := Is_Uninstantiated_Package (Decl);
      Prev_Subprg_Instance : Subprgs.Subprg_Instance_Stack;
      Mark  : Id_Mark_Type;
   begin
      if Is_Uninst and then Get_Macro_Expanded_Flag (Decl) then
         --  Nothing to do for macro-expanded packages.
         return;
      end if;

      Push_Identifier_Prefix (Mark, Get_Identifier (Decl));

      if Is_Uninst then
         --  An extra parameter for the package instance needs to be added
         --  to the subprograms.
         Subprgs.Push_Subprg_Instance
           (Info.Package_Body_Scope'Access, Info.Package_Body_Ptr_Type,
            Wki_Instance, Prev_Subprg_Instance);
      end if;

      Chap4.Translate_Declaration_Chain_Subprograms (Decl, What);

      if Is_Uninst then
         if What in Subprg_Translate_Spec then
            --  Also declare elaborator subprograms.
            Create_Package_Elaborator (Info);
         end if;

         Subprgs.Pop_Subprg_Instance (Wki_Instance, Prev_Subprg_Instance);

         if What in Subprg_Translate_Body then
            --  For nested package, this will be translated when translating
            --  subprograms.
            Set_Scope_Via_Field (Info.Package_Spec_Scope,
                                 Info.Package_Spec_Field,
                                 Info.Package_Body_Scope'Access);

            Elab_Package_Internal (Decl, Get_Package_Header (Decl));

            Clear_Scope (Info.Package_Spec_Scope);

            if not Get_Need_Body (Decl)
              and then Get_Package_Body (Decl) = Null_Iir
            then
               Elab_Package_Body (Decl, Null_Iir);
            end if;
         end if;
      end if;

      Pop_Identifier_Prefix (Mark);
   end Translate_Package_Declaration_Subprograms;

   procedure Translate_Package_Body_Subprograms
     (Bod : Iir_Package_Body; What : Subprg_Translate_Kind)
   is
      Spec : constant Iir := Get_Package (Bod);
      Is_Uninst : constant Boolean := Is_Uninstantiated_Package (Spec);
      Info : constant Ortho_Info_Acc := Get_Info (Spec);
      Prev_Subprg_Instance : Subprgs.Subprg_Instance_Stack;
      Mark  : Id_Mark_Type;
   begin
      if Is_Uninst and then Get_Macro_Expanded_Flag (Spec) then
         --  Nothing to do for macro-expanded packages.
         return;
      end if;

      Push_Identifier_Prefix (Mark, Get_Identifier (Spec));

      if Is_Uninst then
         --  An extra parameter for the package instance needs to be added
         --  to the subprograms.
         Subprgs.Push_Subprg_Instance
           (Info.Package_Body_Scope'Access, Info.Package_Body_Ptr_Type,
            Wki_Instance, Prev_Subprg_Instance);

         --  For nested package, this will be translated when translating
         --  subprograms.
         Set_Scope_Via_Field (Info.Package_Spec_Scope,
                              Info.Package_Spec_Field,
                              Info.Package_Body_Scope'Access);
      end if;

      Chap4.Translate_Declaration_Chain_Subprograms (Bod, What);

      if Is_Uninst then
         Clear_Scope (Info.Package_Spec_Scope);
         Subprgs.Pop_Subprg_Instance (Wki_Instance, Prev_Subprg_Instance);

         if What in Subprg_Translate_Body then
            Elab_Package_Body (Spec, Bod);
         end if;
      end if;

      Pop_Identifier_Prefix (Mark);
   end Translate_Package_Body_Subprograms;

   procedure Translate_Package_Declaration (Decl : Iir_Package_Declaration)
   is
      Mark : Id_Mark_Type;
   begin
      --  Skip uninstantiated package that have to be macro-expanded.
      if Get_Macro_Expanded_Flag (Decl) then
         return;
      end if;

      Push_Identifier_Prefix (Mark, Get_Identifier (Decl));

      if Is_Uninstantiated_Package (Decl) then
         Translate_Package_Uninst_Common (Decl, Get_Package_Header (Decl));
      else
         Translate_Package_Concrete_Common (Decl, Get_Package_Header (Decl));
      end if;

      Pop_Identifier_Prefix (Mark);
   end Translate_Package_Declaration;

   procedure Translate_Package_Declaration_Unit
     (Decl : Iir_Package_Declaration)
   is
      Header : Iir;
   begin
      --  Skip uninstantiated package that have to be macro-expanded.
      if Get_Macro_Expanded_Flag (Decl) then
         return;
      end if;

      Header := Get_Package_Header (Decl);
      if Is_Uninstantiated_Package (Decl) then
         Translate_Package_Uninst_Common (Decl, Header);
         Translate_Package_Uninst_Unit (Decl, Header);
      else
         Translate_Package_Concrete_Common (Decl, Header);
         Translate_Package_Concrete_Unit (Decl, Header);
      end if;
   end Translate_Package_Declaration_Unit;

   procedure Translate_Package_Body_Internal (Bod : Iir_Package_Body)
   is
      Is_Nested : constant Boolean := Is_Nested_Package (Bod);
      Spec      : constant Iir_Package_Declaration := Get_Package (Bod);

      --  True if the package spec is a package declaration.  It could be a
      --  package instantiation declaration.
      Is_Spec_Decl : constant Boolean :=
        Get_Kind (Spec) = Iir_Kind_Package_Declaration;

      Info      : constant Ortho_Info_Acc := Get_Info (Spec);
      Prev_Storage : constant O_Storage := Global_Storage;
      Prev_Subprg_Instance : Subprgs.Subprg_Instance_Stack;
   begin
      if Is_Spec_Decl and then Get_Macro_Expanded_Flag (Spec) then
         return;
      end if;

      --  Translate declarations.
      if Is_Spec_Decl and then Is_Uninstantiated_Package (Spec) then
         Push_Package_Instance_Factory (Spec);

         --  Translate the specifications.
         Chap4.Translate_Declaration_Chain (Bod);

         Pop_Package_Instance_Factory (Spec);
      else
         Restore_Local_Identifier (Info.Package_Local_Id);

         Chap4.Translate_Declaration_Chain (Bod);
      end if;

      --  May be called during elaboration to generate RTI.
      if Global_Storage = O_Storage_External then
         return;
      end if;

      Global_Storage := O_Storage_Private;

      --  Generate RTI, but not for nested packages (RTI will be generated as
      --  a declaration by the parent).
      if not Is_Nested and then Flag_Rti then
         Rtis.Generate_Unit (Bod);
      end if;

      if Is_Spec_Decl and then Is_Uninstantiated_Package (Spec) then
         --  Add access to the specs.
         Subprgs.Push_Subprg_Instance
           (Info.Package_Body_Scope'Access, Info.Package_Body_Ptr_Type,
            Wki_Instance, Prev_Subprg_Instance);
         Set_Scope_Via_Field (Info.Package_Spec_Scope,
                              Info.Package_Spec_Field,
                              Info.Package_Body_Scope'Access);
      end if;

      if not Is_Nested then
         --  Translate subprograms.  For nested package, this has to be called
         --  when translating subprograms.
         Chap4.Translate_Declaration_Chain_Subprograms
           (Bod, Subprg_Translate_Spec_And_Body);
      end if;

      if Is_Spec_Decl and then Is_Uninstantiated_Package (Spec) then
         Subprgs.Pop_Subprg_Instance (Wki_Instance, Prev_Subprg_Instance);
         if not Is_Nested then
            Chap4.Translate_Declaration_Chain_Subprograms
              (Spec, Subprg_Translate_Only_Body);
            Elab_Package_Internal (Spec, Get_Package_Header (Spec));
         end if;
         Clear_Scope (Info.Package_Spec_Scope);
      end if;

      if not Is_Nested and Flag_Elaboration then
         Elab_Package_Body (Spec, Bod);
      end if;

      Global_Storage := Prev_Storage;
   end Translate_Package_Body_Internal;

   --  For a nested package body or for a nested package instantiation body.
   procedure Translate_Package_Body (Bod : Iir_Package_Body)
   is
      Spec : constant Iir_Package_Declaration := Get_Package (Bod);
      Mark : Id_Mark_Type;
   begin
      Push_Identifier_Prefix (Mark, Get_Identifier (Spec));

      Translate_Package_Body_Internal (Bod);

      Pop_Identifier_Prefix (Mark);
   end Translate_Package_Body;

   procedure Translate_Package_Body_Unit (Bod : Iir_Package_Body) is
   begin
      if not Flag_Elaboration then
         return;
      end if;

      Translate_Package_Body_Internal (Bod);
   end Translate_Package_Body_Unit;

   --  Elaborate a package or a package instantiation.
   procedure Elab_Package_Internal (Spec : Iir; Header : Iir)
   is
      Is_Nested : constant Boolean := Is_Nested_Package (Spec);
      Is_Uninst : constant Boolean :=
        Get_Kind (Spec) = Iir_Kind_Package_Declaration
        and then Is_Uninstantiated_Package (Spec);
      Info   : constant Ortho_Info_Acc := Get_Info (Spec);
      Final  : Boolean;
      Constr : O_Assoc_List;
   begin
      if not Flag_Elaboration and not Is_Nested then
         return;
      end if;

      if (not Is_Nested) or else Is_Uninst then
         Start_Subprogram_Body (Info.Package_Elab_Spec_Subprg);
         Push_Local_Factory;
         Subprgs.Start_Subprg_Instance_Use (Info.Package_Elab_Spec_Instance);

         if not Is_Nested then
            Elab_Dependence (Get_Design_Unit (Spec));
         end if;

         if not Is_Uninst then
            --  Register the top level package.  This is done dynamically, as
            --  we know only during elaboration that the design depends on a
            --  package (a package maybe referenced by an entity which is never
            --  instantiated due to generate statements).
            Start_Association (Constr, Ghdl_Rti_Add_Package);
            New_Association
              (Constr, Rtis.New_Rti_Address (Info.Package_Rti_Const));
            New_Procedure_Call (Constr);
         end if;

         Open_Temp;
      end if;

      if Is_Valid (Header)
        and then Is_Valid (Get_Generic_Map_Aspect_Chain (Header))
      then
         Chap5.Elab_Generic_Map_Aspect
           (Header, Header,
            (Info.Package_Spec_Scope'Access, Info.Package_Spec_Scope));
      end if;
      Chap4.Elab_Declaration_Chain (Spec, Final);
      pragma Unreferenced (Final);

      if (not Is_Nested) or else Is_Uninst then
         Close_Temp;

         Subprgs.Finish_Subprg_Instance_Use (Info.Package_Elab_Spec_Instance);
         Pop_Local_Factory;
         Finish_Subprogram_Body;
      end if;
   end Elab_Package_Internal;

   procedure Elab_Package_Declaration (Spec : Iir) is
   begin
      Elab_Package_Internal (Spec, Get_Package_Header (Spec));
   end Elab_Package_Declaration;

   procedure Elab_Package_Body (Spec : Iir_Package_Declaration; Bod : Iir)
   is
      --  SPEC can be a package declaration or a package instantiation.
      Is_Spec_Decl : constant Boolean :=
        Get_Kind (Spec) = Iir_Kind_Package_Declaration;
      Is_Uninst : constant Boolean :=
        Is_Spec_Decl and then Is_Uninstantiated_Package (Spec);

      Info   : constant Ortho_Info_Acc := Get_Info (Spec);
      If_Blk : O_If_Block;
      Constr : O_Assoc_List;
      Final  : Boolean;
   begin
      --  Macro-expanded packages are skipped.
      pragma Assert
        (not (Is_Spec_Decl and then Get_Macro_Expanded_Flag (Spec)));

      --  No elaboration code generated, except for nested packages
      --  (could be within a subprogram).
      pragma Assert (Flag_Elaboration or else Is_Nested_Package (Spec));

      if Is_Uninst then
         --  Make spec reachable.
         Set_Scope_Via_Field (Info.Package_Spec_Scope,
                              Info.Package_Spec_Field,
                              Info.Package_Body_Scope'Access);
      end if;

      Start_Subprogram_Body (Info.Package_Elab_Body_Subprg);
      Push_Local_Factory;
      Subprgs.Start_Subprg_Instance_Use (Info.Package_Elab_Body_Instance);

      --  If the package was already elaborated, return now,
      --  else mark the package as elaborated.
      if Info.Package_Elab_Var /= Null_Var then
         Start_If_Stmt (If_Blk, New_Value (Get_Var (Info.Package_Elab_Var)));
         New_Return_Stmt;
         New_Else_Stmt (If_Blk);
         New_Assign_Stmt (Get_Var (Info.Package_Elab_Var),
                          New_Lit (Ghdl_Bool_True_Node));
         Finish_If_Stmt (If_Blk);
      end if;

      --  Elab Spec.
      Start_Association (Constr, Info.Package_Elab_Spec_Subprg);
      Add_Subprg_Instance_Assoc (Constr, Info.Package_Elab_Spec_Instance);
      New_Procedure_Call (Constr);

      if Bod /= Null_Iir then
         if not Is_Nested_Package (Bod) then
            Elab_Dependence (Get_Design_Unit (Bod));
         end if;

         Open_Temp;
         Chap4.Elab_Declaration_Chain (Bod, Final);
         Close_Temp;
      end if;

      Subprgs.Finish_Subprg_Instance_Use (Info.Package_Elab_Body_Instance);
      Pop_Local_Factory;
      Finish_Subprogram_Body;

      if Is_Uninst then
         Clear_Scope (Info.Package_Spec_Scope);
      end if;
   end Elab_Package_Body;

   procedure Elab_Package_Unit_Without_Body (Spec : Iir) is
   begin
      if Get_Macro_Expanded_Flag (Spec) then
         return;
      end if;

      Elab_Package_Body (Spec, Null_Iir);
   end Elab_Package_Unit_Without_Body;

   procedure Instantiate_Iir_Info (N : Iir);

   procedure Instantiate_Iir_Chain_Info (Chain : Iir)
   is
      N : Iir;
   begin
      N := Chain;
      while N /= Null_Iir loop
         Instantiate_Iir_Info (N);
         N := Get_Chain (N);
      end loop;
   end Instantiate_Iir_Chain_Info;

   procedure Instantiate_Iir_List_Info (L : Iir_List)
   is
      It : List_Iterator;
   begin
      case L is
         when Null_Iir_List
            | Iir_List_All =>
            return;
         when others =>
            It := List_Iterate (L);
            while Is_Valid (It) loop
               Instantiate_Iir_Info (Get_Element (It));
               Next (It);
            end loop;
      end case;
   end Instantiate_Iir_List_Info;

   procedure Instantiate_Iir_Flist_Info (L : Iir_Flist)


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