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diff --git a/src/translate/grt/grt-signals.ads b/src/translate/grt/grt-signals.ads
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---  GHDL Run Time (GRT) - signals management.
---  Copyright (C) 2002 - 2014 Tristan Gingold
---
---  GHDL is free software; you can redistribute it and/or modify it under
---  the terms of the GNU General Public License as published by the Free
---  Software Foundation; either version 2, or (at your option) any later
---  version.
---
---  GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
---  WARRANTY; without even the implied warranty of MERCHANTABILITY or
---  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
---  for more details.
---
---  You should have received a copy of the GNU General Public License
---  along with GCC; see the file COPYING.  If not, write to the Free
---  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
---  02111-1307, 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.
-with System;
-with Ada.Unchecked_Conversion;
-with Grt.Table;
-with Grt.Types; use Grt.Types;
-with Grt.Rtis; use Grt.Rtis;
-limited with Grt.Processes;
-pragma Elaborate_All (Grt.Table);
-
-package Grt.Signals is
-   pragma Suppress (All_Checks);
-
-   --  Kind of transaction.
-   type Transaction_Kind is
-     (
-      --  Normal transaction, with a value.
-      Trans_Value,
-      --  Normal transaction, with a pointer to a value (direct assignment).
-      Trans_Direct,
-      --  Null transaction.
-      Trans_Null,
-      --  Like a normal transaction, but without a value due to check error.
-      Trans_Error
-     );
-
-   type Transaction;
-   type Transaction_Acc is access Transaction;
-   type Transaction (Kind : Transaction_Kind) is record
-      --  Line for error.  Put here to compact the record.
-      Line : Ghdl_I32;
-
-      Next : Transaction_Acc;
-      Time : Std_Time;
-      case Kind is
-         when Trans_Value =>
-            Val : Value_Union;
-         when Trans_Direct =>
-            Val_Ptr : Ghdl_Value_Ptr;
-         when Trans_Null =>
-            null;
-         when Trans_Error =>
-            --  Filename for error.
-            File : Ghdl_C_String;
-      end case;
-   end record;
-
-   type Process_Acc is access Grt.Processes.Process_Type;
-
-   --  A driver is bound to a process (PROC) and contains a list of
-   --  transactions.
-   type Driver_Type is record
-      First_Trans : Transaction_Acc;
-      Last_Trans : Transaction_Acc;
-      Proc : Process_Acc;
-   end record;
-
-   type Driver_Acc is access all Driver_Type;
-   type Driver_Fat_Array is array (Ghdl_Index_Type) of aliased Driver_Type;
-   type Driver_Arr_Ptr is access Driver_Fat_Array;
-
-   --  Function access type used to evaluate the guard expression.
-   type Guard_Func_Acc is access function (This : System.Address)
-                                          return Ghdl_B1;
-   pragma Convention (C, Guard_Func_Acc);
-
-   --  Simply linked list of processes to be resumed in case of events.
-
-   type Ghdl_Signal;
-   type Ghdl_Signal_Ptr is access Ghdl_Signal;
-
-   function To_Ghdl_Signal_Ptr is new Ada.Unchecked_Conversion
-     (Source => System.Address, Target => Ghdl_Signal_Ptr);
-
-   type Signal_Fat_Array is array (Ghdl_Index_Type) of Ghdl_Signal_Ptr;
-   type Signal_Arr_Ptr is access Signal_Fat_Array;
-
-   function To_Signal_Arr_Ptr is new Ada.Unchecked_Conversion
-     (Source => System.Address, Target => Signal_Arr_Ptr);
-
-   --  List of processes to wake-up in case of event on the signal.
-   type Action_List;
-   type Action_List_Acc is access Action_List;
-
-   type Action_List (Dynamic : Boolean) is record
-      --  Next action for the current signal.
-      Next : Action_List_Acc;
-
-      --  Process to wake-up.
-      Proc : Process_Acc;
-
-      case Dynamic is
-         when True =>
-            --  For a non-sensitized process.
-            --  Previous action (to speed-up remove from the chain).
-            Prev : Action_List_Acc;
-
-            Sig : Ghdl_Signal_Ptr;
-
-            --  Chain of signals for the process.
-            Chain : Action_List_Acc;
-         when False =>
-            null;
-      end case;
-   end record;
-
-   --  Resolution function.
-   --  There is a wrapper around resolution functions to simplify the call
-   --  from GRT.
-   --  INSTANCE is the opaque parameter given when the resolver is
-   --   registers (RESOLV_INST).
-   --  VAL is the signal (which may be composite).
-   --  BOOL_VEC is an array of NBR_DRV booleans (bytes) and indicates
-   --  non-null drivers.  There are VEC_LEN non-null drivers.  So the number
-   --  of values is VEC_LEN + NBR_PORTS.  This number of values is the length
-   --  of the array for the resolution function.
-   type Resolver_Acc is access procedure
-     (Instance : System.Address;
-      Val : System.Address;
-      Bool_Vec : System.Address;
-      Vec_Len : Ghdl_Index_Type;
-      Nbr_Drv : Ghdl_Index_Type;
-      Nbr_Ports : Ghdl_Index_Type);
-
-   --  On some platforms, GNAT use a descriptor (instead of a trampoline) for
-   --  nested subprograms. This descriptor contains the address of the
-   --  subprogram and the address of the chain. An unaligned pointer to this
-   --  descriptor (address + 1) is then used for 'Access, and every indirect
-   --  call check for unaligned address.
-   --
-   --  Disable this feature (as a resolver is never a nested subprogram), so
-   --  code generated by ghdl is compatible with ghdl runtimes built with
-   --  gnat.
-   pragma Convention (C, Resolver_Acc);
-
-   --  How to compute resolved signal.
-   type Resolved_Signal_Type is record
-      Resolv_Proc : Resolver_Acc;
-      Resolv_Inst : System.Address;
-      Resolv_Ptr : System.Address;
-      Sig_Range : Sig_Table_Range;
-      Disconnect_Time : Std_Time;
-   end record;
-
-   type Resolved_Signal_Acc is access Resolved_Signal_Type;
-
-   type Conversion_Func_Acc is access procedure (Instance : System.Address);
-   pragma Convention (C, Conversion_Func_Acc);
-
-   function To_Conversion_Func_Acc is new Ada.Unchecked_Conversion
-     (Source => System.Address, Target => Conversion_Func_Acc);
-
-   --  Signal conversion data.
-   type Sig_Conversion_Type is record
-      --  Function which performs the conversion.
-      Func : System.Address;
-      Instance : System.Address;
-
-      Src : Sig_Table_Range;
-      Dest : Sig_Table_Range;
-   end record;
-   type Sig_Conversion_Acc is access Sig_Conversion_Type;
-
-   type Forward_Build_Type is record
-      Src : Ghdl_Signal_Ptr;
-      Targ : Ghdl_Signal_Ptr;
-   end record;
-   type Forward_Build_Acc is access Forward_Build_Type;
-
-   --  Used to order the signals for the propagation of signals values.
-   type Propag_Order_Flag is
-     (
-      --  The signal was not yet ordered.
-      Propag_None,
-      --  The signal is being ordered for driving value.
-      --  This stage is used to catch loop (which can not occur).
-      Propag_Being_Driving,
-      --  The signal has been ordered for driving value.
-      Propag_Driving,
-      --  The signal is being ordered for effective value.
-      Propag_Being_Effective,
-      --  The signal has completly been ordered.
-      Propag_Done);
-
-   --  Each signal belongs to a signal_net.
-   --  Signals on the same net must be updated in order.
-   --  Signals on different nets have no direct relation-ship, and thus may
-   --  be updated without order.
-   --  Net NO_SIGNAL_NET is special: it groups all lonely signals.
-   type Signal_Net_Type is new Integer;
-   No_Signal_Net : constant Signal_Net_Type := 0;
-   Net_One_Driver : constant Signal_Net_Type := -1;
-   Net_One_Direct : constant Signal_Net_Type := -2;
-   Net_One_Resolved : constant Signal_Net_Type := -3;
-
-   --  Flush the list of active signals.
-   procedure Flush_Active_List;
-
-   type Ghdl_Signal_Data (Mode_Sig : Mode_Signal_Type := Mode_Signal)
-   is record
-      case Mode_Sig is
-         when Mode_Signal_User =>
-            Nbr_Drivers : Ghdl_Index_Type;
-            Drivers : Driver_Arr_Ptr;
-
-            --  Signal which defines the effective value of this signal,
-            --  if any.
-            Effective : Ghdl_Signal_Ptr;
-
-            --  Null if not resolved.
-            Resolv : Resolved_Signal_Acc;
-
-         when Mode_Conv_In
-           | Mode_Conv_Out =>
-            --  Conversion paramaters for conv_in, conv_out.
-            Conv : Sig_Conversion_Acc;
-
-         when Mode_Stable
-           | Mode_Quiet
-           | Mode_Delayed =>
-            --  Time parameter for 'stable, 'quiet or 'delayed
-            Time : Std_Time;
-            Attr_Trans : Transaction_Acc;
-
-         when Mode_Guard =>
-            --  Guard function and instance used to compute the
-            --  guard expression.
-            Guard_Func : Guard_Func_Acc;
-            Guard_Instance : System.Address;
-
-         when Mode_Transaction
-           | Mode_End =>
-            null;
-      end case;
-   end record;
-   pragma Suppress (Discriminant_Check, On => Ghdl_Signal_Data);
-
-   type Ghdl_Signal_Flags is record
-      --  Status of the ordering.
-      Propag : Propag_Order_Flag;
-
-      --  If set, the signal is dumped in a GHW file.
-      Is_Dumped : Boolean;
-
-      --  Set when an event occured.
-      --  Only reset by GHW file dumper.
-      Cyc_Event : Boolean;
-
-      --  Set if the signal has already been visited.  When outside of the
-      --  algorithm that use it, it must be cleared.
-      Seen : Boolean;
-   end record;
-   pragma Pack (Ghdl_Signal_Flags);
-
-   type Ghdl_Signal is record
-      --  Fields known by the compilers.
-      Value : Value_Union;
-      Driving_Value : Value_Union;
-      Last_Value : Value_Union;
-      Last_Event : Std_Time;
-      Last_Active : Std_Time;
-
-      Event : Boolean;
-      Active : Boolean;
-      --  If set, the activity of the signal is required by the user.
-      Has_Active : Boolean;
-
-      --  Internal fields.
-      --  NOTE: keep above fields (components) in sync with translation.
-
-      --  If set, the signal has an active direct driver.
-      Is_Direct_Active : Boolean;
-
-      --  Kind of the signal (none, bus or register).
-      Sig_Kind : Kind_Signal_Type;
-
-      --  Values mode of this signal.
-      Mode : Mode_Type;
-
-      --  Misc flags.
-      Flags : Ghdl_Signal_Flags;
-
-      --  Net of the signal.
-      Net : Signal_Net_Type;
-
-      --  Chain of signals that will be active in the next delta-cycle.
-      --  (Also used to build nets).
-      Link : Ghdl_Signal_Ptr;
-
-      --  Chain of signals whose active flag was set.  Used to clear the active
-      --  flag at the end of the delta cycle.
-      Alink : Ghdl_Signal_Ptr;
-
-      --  Chain of signals that have a projected waveform in the real future.
-      Flink : Ghdl_Signal_Ptr;
-
-      --  List of processes to resume when there is an event on
-      --  this signal.
-      Event_List : Action_List_Acc;
-
-      --  Path of the signal (with its name) in the design hierarchy.
-      --  Used to get the type of the signal.
-      Rti : Ghdl_Rtin_Object_Acc;
-
-      --  For user signals: the sources of a signals are drivers
-      --  and connected ports.
-      --  For implicit signals: PORTS is used as dependence list.
-      Nbr_Ports : Ghdl_Index_Type;
-      Ports : Signal_Arr_Ptr;
-
-      --  Mode of the signal (in, out ...)
-      --Mode_Signal : Mode_Signal_Type;
-      S : Ghdl_Signal_Data;
-   end record;
-
-   --  Each simple signal declared can be accessed by SIG_TABLE.
-   package Sig_Table is new Grt.Table
-     (Table_Component_Type => Ghdl_Signal_Ptr,
-      Table_Index_Type => Sig_Table_Index,
-      Table_Low_Bound => 0,
-      Table_Initial => 128);
-
-   --  Return the next time at which a driver becomes active.
-   function Find_Next_Time return Std_Time;
-
-   --  Elementary propagation computation.
-   --  See LRM 12.6.2 and 12.6.3
-   type Propagation_Kind_Type is
-     (
-      --  How to compute driving value:
-      --  Default value.
-      Drv_Error,
-
-      --  One source, a driver and not resolved:
-      --  the driving value is the driver.
-      Drv_One_Driver,
-
-      --  Same as previous, and the effective value is the driving value.
-      Eff_One_Driver,
-
-      --  One source, a port and not resolved:
-      --  the driving value is the driving value of the port.
-      --  Dependence.
-      Drv_One_Port,
-
-      --  Same as previous, and the effective value is the driving value.
-      Eff_One_Port,
-
-      --  Several sources or resolved:
-      --  signal is not composite.
-      Drv_One_Resolved,
-      Eff_One_Resolved,
-
-      --  Use the resolution function, signal is composite.
-      Drv_Multiple,
-
-      --  Same as previous, but the effective value is the previous value.
-      Eff_Multiple,
-
-      --  The effective value is the actual associated.
-      Eff_Actual,
-
-      --  Sig must be updated but does not belong to the same net.
-      Imp_Forward,
-      Imp_Forward_Build,
-
-      --  Implicit guard signal.
-      --  Its value must be evaluated after the effective value of its
-      --  dependences.
-      Imp_Guard,
-
-      --  Implicit stable.
-      --  Its value must be evaluated after the effective value of its
-      --  dependences.
-      Imp_Stable,
-
-      --  Implicit quiet.
-      --  Its value must be evaluated after the driving value of its
-      --  dependences.
-      Imp_Quiet,
-
-      --  Implicit transaction.
-      --  Its value must be evaluated after the driving value of its
-      --  dependences.
-      Imp_Transaction,
-
-      --  Implicit delayed
-      --  Its value must be evaluated after the driving value of its
-      --  dependences.
-      Imp_Delayed,
-
-      --  in_conversion.
-      --  Pseudo-signal which is set by conversion function.
-      In_Conversion,
-      Out_Conversion,
-
-      --  End of propagation.
-      Prop_End
-      );
-
-   type Propagation_Type (Kind : Propagation_Kind_Type := Drv_Error) is record
-      case Kind is
-         when Drv_Error =>
-            null;
-         when Drv_One_Driver
-           | Eff_One_Driver
-           | Drv_One_Port
-           | Eff_One_Port
-           | Imp_Forward
-           | Imp_Guard
-           | Imp_Quiet
-           | Imp_Transaction
-           | Imp_Stable
-           | Imp_Delayed
-           | Eff_Actual
-           | Eff_One_Resolved
-           | Drv_One_Resolved =>
-            Sig : Ghdl_Signal_Ptr;
-         when Drv_Multiple
-           | Eff_Multiple =>
-            Resolv : Resolved_Signal_Acc;
-         when In_Conversion
-           | Out_Conversion =>
-            Conv : Sig_Conversion_Acc;
-         when Imp_Forward_Build =>
-            Forward : Forward_Build_Acc;
-         when Prop_End =>
-            Updated : Boolean;
-      end case;
-   end record;
-
-   package Propagation is new Grt.Table
-     (Table_Component_Type => Propagation_Type,
-      Table_Index_Type => Signal_Net_Type,
-      Table_Low_Bound => 1,
-      Table_Initial => 128);
-
-   --  Get the signal index of PTR.
-   function Signal_Ptr_To_Index (Ptr : Ghdl_Signal_Ptr) return Sig_Table_Index;
-
-   --  Compute propagation order of signals.
-   procedure Order_All_Signals;
-
-   --  Initialize the package (mainly the lists).
-   procedure Init;
-
-   --  Initialize all signals.
-   procedure Init_Signals;
-
-   --  Update signals.
-   procedure Update_Signals;
-
-   --  Set the effective value of signal SIG to VAL.
-   --  If the value is different from the previous one, resume processes.
-   procedure Set_Effective_Value (Sig : Ghdl_Signal_Ptr; Val : Value_Union);
-
-   --  Add PROC in the list of processes to be resumed in case of event on
-   --  SIG.
-   procedure Resume_Process_If_Event
-     (Sig : Ghdl_Signal_Ptr; Proc : Process_Acc);
-
-   --  Creating a signal:
-   --  1a) call Ghdl_Signal_Name_Rti (CTXT and ADDR are unused) to register
-   --      the RTI for the whole signal (in particular the mode and the
-   --      has_active flag)
-   --  or
-   --  1b) call Ghdl_Signal_Set_Mode to register the mode and the has_active
-   --      flag.  In that case, the signal has no name.
-   --
-   --  2) call Ghdl_Create_Signal_XXX for each non-composite element
-
-   procedure Ghdl_Signal_Name_Rti (Sig : Ghdl_Rti_Access;
-                                   Ctxt : Ghdl_Rti_Access;
-                                   Addr : System.Address);
-
-   procedure Ghdl_Signal_Set_Mode (Mode : Mode_Signal_Type;
-                                   Kind : Kind_Signal_Type;
-                                   Has_Active : Boolean);
-
-   --  FIXME: document.
-   --  Merge RTI with SIG: adjust the has_active flag of SIG according to RTI.
-   procedure Ghdl_Signal_Merge_Rti (Sig : Ghdl_Signal_Ptr;
-                                    Rti : Ghdl_Rti_Access);
-
-   --  Assigning a waveform to a signal:
-   --
-   --  For simple waveform (sig <= val), the short form can be used:
-   --    Ghdl_Signal_Simple_Assign_XX (Sig, Val);
-   --  For all other forms
-   --  SIG <= reject R inertial V1 after T1, V2 after T2, ...:
-   --    Ghdl_Signal_Start_Assign_XX (SIG, R, V1, T1);
-   --    Ghdl_Signal_Next_Assign_XX (SIG, V2, T2);
-   --    ...
-   --  If the delay mechanism is transport, they R = 0,
-   --  if there is no rejection time, the mechanism is internal and R = T1.
-
-   --  Performs some internal checks on signals (transaction order).
-   --  Internal_error is called in case of error.
-   procedure Ghdl_Signal_Internal_Checks;
-
-   procedure Ghdl_Signal_Simple_Assign_Error (Sign : Ghdl_Signal_Ptr;
-                                              File : Ghdl_C_String;
-                                              Line : Ghdl_I32);
-   procedure Ghdl_Signal_Start_Assign_Error (Sign : Ghdl_Signal_Ptr;
-                                             Rej : Std_Time;
-                                             After : Std_Time;
-                                             File : Ghdl_C_String;
-                                             Line : Ghdl_I32);
-   procedure Ghdl_Signal_Next_Assign_Error (Sign : Ghdl_Signal_Ptr;
-                                            After : Std_Time;
-                                            File : Ghdl_C_String;
-                                            Line : Ghdl_I32);
-
-   procedure Ghdl_Signal_Direct_Assign (Sign : Ghdl_Signal_Ptr);
-
-   procedure Ghdl_Signal_Set_Disconnect (Sign : Ghdl_Signal_Ptr;
-                                         Time : Std_Time);
-
-   procedure Ghdl_Signal_Disconnect (Sign : Ghdl_Signal_Ptr);
-
-   procedure Ghdl_Signal_Start_Assign_Null (Sign : Ghdl_Signal_Ptr;
-                                            Rej : Std_Time;
-                                            After : Std_Time);
-
-   function Ghdl_Signal_Driving (Sig : Ghdl_Signal_Ptr) return Ghdl_B1;
-
-   function Ghdl_Create_Signal_B1 (Init_Val : Ghdl_B1;
-                                   Resolv_Func : Resolver_Acc;
-                                   Resolv_Inst : System.Address)
-                                  return Ghdl_Signal_Ptr;
-   procedure Ghdl_Signal_Init_B1 (Sig : Ghdl_Signal_Ptr; Init_Val : Ghdl_B1);
-   procedure Ghdl_Signal_Associate_B1 (Sig : Ghdl_Signal_Ptr; Val : Ghdl_B1);
-   procedure Ghdl_Signal_Simple_Assign_B1 (Sign : Ghdl_Signal_Ptr;
-                                           Val : Ghdl_B1);
-   procedure Ghdl_Signal_Start_Assign_B1 (Sign : Ghdl_Signal_Ptr;
-                                          Rej : Std_Time;
-                                          Val : Ghdl_B1;
-                                          After : Std_Time);
-   procedure Ghdl_Signal_Next_Assign_B1 (Sign : Ghdl_Signal_Ptr;
-                                         Val : Ghdl_B1;
-                                         After : Std_Time);
-   function Ghdl_Signal_Driving_Value_B1 (Sig : Ghdl_Signal_Ptr)
-                                         return Ghdl_B1;
-
-   function Ghdl_Create_Signal_E8 (Init_Val : Ghdl_E8;
-                                   Resolv_Func : Resolver_Acc;
-                                   Resolv_Inst : System.Address)
-                                  return Ghdl_Signal_Ptr;
-   procedure Ghdl_Signal_Init_E8 (Sig : Ghdl_Signal_Ptr; Init_Val : Ghdl_E8);
-   procedure Ghdl_Signal_Associate_E8 (Sig : Ghdl_Signal_Ptr; Val : Ghdl_E8);
-   procedure Ghdl_Signal_Simple_Assign_E8 (Sign : Ghdl_Signal_Ptr;
-                                           Val : Ghdl_E8);
-   procedure Ghdl_Signal_Start_Assign_E8 (Sign : Ghdl_Signal_Ptr;
-                                          Rej : Std_Time;
-                                          Val : Ghdl_E8;
-                                          After : Std_Time);
-   procedure Ghdl_Signal_Next_Assign_E8 (Sign : Ghdl_Signal_Ptr;
-                                         Val : Ghdl_E8;
-                                         After : Std_Time);
-   function Ghdl_Signal_Driving_Value_E8 (Sig : Ghdl_Signal_Ptr)
-                                         return Ghdl_E8;
-
-   function Ghdl_Create_Signal_E32 (Init_Val : Ghdl_E32;
-                                    Resolv_Func : Resolver_Acc;
-                                    Resolv_Inst : System.Address)
-                                   return Ghdl_Signal_Ptr;
-   procedure Ghdl_Signal_Init_E32 (Sig : Ghdl_Signal_Ptr; Init_Val : Ghdl_E32);
-   procedure Ghdl_Signal_Associate_E32 (Sig : Ghdl_Signal_Ptr; Val : Ghdl_E32);
-   procedure Ghdl_Signal_Simple_Assign_E32 (Sign : Ghdl_Signal_Ptr;
-                                           Val : Ghdl_E32);
-   procedure Ghdl_Signal_Start_Assign_E32 (Sign : Ghdl_Signal_Ptr;
-                                          Rej : Std_Time;
-                                          Val : Ghdl_E32;
-                                          After : Std_Time);
-   procedure Ghdl_Signal_Next_Assign_E32 (Sign : Ghdl_Signal_Ptr;
-                                         Val : Ghdl_E32;
-                                         After : Std_Time);
-   function Ghdl_Signal_Driving_Value_E32 (Sig : Ghdl_Signal_Ptr)
-                                         return Ghdl_E32;
-
-   function Ghdl_Create_Signal_I32 (Init_Val : Ghdl_I32;
-                                    Resolv_Func : Resolver_Acc;
-                                    Resolv_Inst : System.Address)
-                                   return Ghdl_Signal_Ptr;
-   procedure Ghdl_Signal_Init_I32 (Sig : Ghdl_Signal_Ptr; Init_Val : Ghdl_I32);
-   procedure Ghdl_Signal_Associate_I32 (Sig : Ghdl_Signal_Ptr; Val : Ghdl_I32);
-   procedure Ghdl_Signal_Simple_Assign_I32 (Sign : Ghdl_Signal_Ptr;
-                                            Val : Ghdl_I32);
-   procedure Ghdl_Signal_Start_Assign_I32 (Sign : Ghdl_Signal_Ptr;
-                                           Rej : Std_Time;
-                                           Val : Ghdl_I32;
-                                           After : Std_Time);
-   procedure Ghdl_Signal_Next_Assign_I32 (Sign : Ghdl_Signal_Ptr;
-                                          Val : Ghdl_I32;
-                                          After : Std_Time);
-   function Ghdl_Signal_Driving_Value_I32 (Sig : Ghdl_Signal_Ptr)
-                                         return Ghdl_I32;
-
-   function Ghdl_Create_Signal_I64 (Init_Val : Ghdl_I64;
-                                    Resolv_Func : Resolver_Acc;
-                                    Resolv_Inst : System.Address)
-                                   return Ghdl_Signal_Ptr;
-   procedure Ghdl_Signal_Init_I64 (Sig : Ghdl_Signal_Ptr; Init_Val : Ghdl_I64);
-   procedure Ghdl_Signal_Associate_I64 (Sig : Ghdl_Signal_Ptr; Val : Ghdl_I64);
-   procedure Ghdl_Signal_Simple_Assign_I64 (Sign : Ghdl_Signal_Ptr;
-                                            Val : Ghdl_I64);
-   procedure Ghdl_Signal_Start_Assign_I64 (Sign : Ghdl_Signal_Ptr;
-                                           Rej : Std_Time;
-                                           Val : Ghdl_I64;
-                                           After : Std_Time);
-   procedure Ghdl_Signal_Next_Assign_I64 (Sign : Ghdl_Signal_Ptr;
-                                          Val : Ghdl_I64;
-                                          After : Std_Time);
-   function Ghdl_Signal_Driving_Value_I64 (Sig : Ghdl_Signal_Ptr)
-                                          return Ghdl_I64;
-
-   function Ghdl_Create_Signal_F64 (Init_Val : Ghdl_F64;
-                                    Resolv_Func : Resolver_Acc;
-                                    Resolv_Inst : System.Address)
-                                   return Ghdl_Signal_Ptr;
-   procedure Ghdl_Signal_Init_F64 (Sig : Ghdl_Signal_Ptr; Init_Val : Ghdl_F64);
-   procedure Ghdl_Signal_Associate_F64 (Sig : Ghdl_Signal_Ptr; Val : Ghdl_F64);
-   procedure Ghdl_Signal_Simple_Assign_F64 (Sign : Ghdl_Signal_Ptr;
-                                            Val : Ghdl_F64);
-   procedure Ghdl_Signal_Start_Assign_F64 (Sign : Ghdl_Signal_Ptr;
-                                           Rej : Std_Time;
-                                           Val : Ghdl_F64;
-                                           After : Std_Time);
-   procedure Ghdl_Signal_Next_Assign_F64 (Sign : Ghdl_Signal_Ptr;
-                                          Val : Ghdl_F64;
-                                          After : Std_Time);
-   function Ghdl_Signal_Driving_Value_F64 (Sig : Ghdl_Signal_Ptr)
-                                         return Ghdl_F64;
-
-   --  Add a driver to SIGN for the current process.
-   procedure Ghdl_Process_Add_Driver (Sign : Ghdl_Signal_Ptr);
-
-   --  Add a direct driver for the current process.  This is an optimization
-   --  that could be used when a driver has no projected waveforms.
-   --
-   --  Assignment using direct driver:
-   --  * the driver value is set
-   --  * put the signal on the ghdl_signal_active_chain, if the signal will
-   --    be active and if not already on the chain.
-   procedure Ghdl_Signal_Add_Direct_Driver (Sign : Ghdl_Signal_Ptr;
-                                            Drv : Ghdl_Value_Ptr);
-
-   --  Used for connexions:
-   --  SRC is a source for TARG.
-   procedure Ghdl_Signal_Add_Source (Targ : Ghdl_Signal_Ptr;
-                                     Src : Ghdl_Signal_Ptr);
-
-   --  The effective value of TARG is the effective value of SRC.
-   procedure Ghdl_Signal_Effective_Value (Targ : Ghdl_Signal_Ptr;
-                                          Src : Ghdl_Signal_Ptr);
-
-   --  Conversions.  In order to do conversion from A to B, an intermediate
-   --  signal T must be created.  The flow is A -> T -> B.
-   --  The link from A -> T is a conversion, added by one of the two
-   --  following procedures.  The type of A and T is different.
-   --  The link from T -> B is a normal connection: either an effective
-   --  one (for in conversion) or a source (for out conversion).
-
-   --  Add an in conversion (from SRC to DEST using function FUNC).
-   --  The effective value can be read and writen directly.
-   procedure Ghdl_Signal_In_Conversion (Func : System.Address;
-                                        Instance : System.Address;
-                                        Src : Ghdl_Signal_Ptr;
-                                        Src_Len : Ghdl_Index_Type;
-                                        Dst : Ghdl_Signal_Ptr;
-                                        Dst_Len : Ghdl_Index_Type);
-
-   --  Add an out conversion.
-   --  The driving value can be read and writen directly.
-   procedure Ghdl_Signal_Out_Conversion (Func : System.Address;
-                                         Instance : System.Address;
-                                         Src : Ghdl_Signal_Ptr;
-                                         Src_Len : Ghdl_Index_Type;
-                                         Dst : Ghdl_Signal_Ptr;
-                                         Dst_Len : Ghdl_Index_Type);
-
-   --  Mark the next (and not yet created) NBR_SIG signals as resolved.
-   procedure Ghdl_Signal_Create_Resolution (Proc : Resolver_Acc;
-                                            Instance : System.Address;
-                                            Sig : System.Address;
-                                            Nbr_Sig : Ghdl_Index_Type);
-
-   --  Create a new 'stable (VAL) signal.  The prefixes are set by
-   --  ghdl_signal_attribute_register_prefix.
-   function Ghdl_Create_Stable_Signal (Val : Std_Time) return Ghdl_Signal_Ptr;
-   --  Create a new 'quiet (VAL) signal.  The prefixes are set by
-   --  ghdl_signal_attribute_register_prefix.
-   function Ghdl_Create_Quiet_Signal (Val : Std_Time) return Ghdl_Signal_Ptr;
-   --  Create a new 'transaction signal.  The prefixes are set by
-   --  ghdl_signal_attribute_register_prefix.
-   function Ghdl_Create_Transaction_Signal return Ghdl_Signal_Ptr;
-
-   --  Create a new SIG'delayed (VAL) signal.
-   function Ghdl_Create_Delayed_Signal (Sig : Ghdl_Signal_Ptr; Val : Std_Time)
-                                       return Ghdl_Signal_Ptr;
-
-   --  Add SIG in the set of prefix for the last created signal.
-   procedure Ghdl_Signal_Attribute_Register_Prefix (Sig : Ghdl_Signal_Ptr);
-
-   --  Create a new implicitly defined GUARD signal.
-   function Ghdl_Signal_Create_Guard (This : System.Address;
-                                      Proc : Guard_Func_Acc)
-                                     return Ghdl_Signal_Ptr;
-
-   --  Add SIG to the list of referenced signals that appear in the guard
-   --  expression.
-   procedure Ghdl_Signal_Guard_Dependence (Sig : Ghdl_Signal_Ptr);
-
-   --  Return number of ports/drivers.
-   function Ghdl_Signal_Get_Nbr_Ports (Sig : Ghdl_Signal_Ptr)
-                                      return Ghdl_Index_Type;
-   function Ghdl_Signal_Get_Nbr_Drivers (Sig : Ghdl_Signal_Ptr)
-                                        return Ghdl_Index_Type;
-
-   --  Read a source (port or driver) from a signal.  This is used by
-   --  resolution functions.
-   function Ghdl_Signal_Read_Port
-     (Sig : Ghdl_Signal_Ptr; Index : Ghdl_Index_Type)
-     return Ghdl_Value_Ptr;
-   function Ghdl_Signal_Read_Driver
-     (Sig : Ghdl_Signal_Ptr; Index : Ghdl_Index_Type)
-     return Ghdl_Value_Ptr;
-
-   Ghdl_Signal_Active_Chain : aliased Ghdl_Signal_Ptr;
-
-   --  Statistics.
-   Nbr_Active : Ghdl_I32;
-   Nbr_Events: Ghdl_I32;
-   function Get_Nbr_Future return Ghdl_I32;
-private
-   pragma Export (C, Ghdl_Signal_Name_Rti,
-                  "__ghdl_signal_name_rti");
-   pragma Export (C, Ghdl_Signal_Merge_Rti,
-                  "__ghdl_signal_merge_rti");
-
-   pragma Export (C, Ghdl_Signal_Simple_Assign_Error,
-                  "__ghdl_signal_simple_assign_error");
-   pragma Export (C, Ghdl_Signal_Start_Assign_Error,
-                  "__ghdl_signal_start_assign_error");
-   pragma Export (C, Ghdl_Signal_Next_Assign_Error,
-                  "__ghdl_signal_next_assign_error");
-
-   pragma Export (C, Ghdl_Signal_Start_Assign_Null,
-                  "__ghdl_signal_start_assign_null");
-
-   pragma Export (C, Ghdl_Signal_Direct_Assign,
-                  "__ghdl_signal_direct_assign");
-
-   pragma Export (C, Ghdl_Signal_Set_Disconnect,
-                  "__ghdl_signal_set_disconnect");
-   pragma Export (C, Ghdl_Signal_Disconnect,
-                  "__ghdl_signal_disconnect");
-
-   pragma Export (Ada, Ghdl_Signal_Driving,
-                  "__ghdl_signal_driving");
-
-   pragma Export (Ada, Ghdl_Create_Signal_B1,
-                  "__ghdl_create_signal_b1");
-   pragma Export (Ada, Ghdl_Signal_Init_B1,
-                  "__ghdl_signal_init_b1");
-   pragma Export (Ada, Ghdl_Signal_Associate_B1,
-                  "__ghdl_signal_associate_b1");
-   pragma Export (Ada, Ghdl_Signal_Simple_Assign_B1,
-                  "__ghdl_signal_simple_assign_b1");
-   pragma Export (Ada, Ghdl_Signal_Start_Assign_B1,
-                  "__ghdl_signal_start_assign_b1");
-   pragma Export (Ada, Ghdl_Signal_Next_Assign_B1,
-                  "__ghdl_signal_next_assign_b1");
-   pragma Export (Ada, Ghdl_Signal_Driving_Value_B1,
-                  "__ghdl_signal_driving_value_b1");
-
-   pragma Export (C, Ghdl_Create_Signal_E8,
-                  "__ghdl_create_signal_e8");
-   pragma Export (C, Ghdl_Signal_Init_E8,
-                  "__ghdl_signal_init_e8");
-   pragma Export (C, Ghdl_Signal_Associate_E8,
-                  "__ghdl_signal_associate_e8");
-   pragma Export (C, Ghdl_Signal_Simple_Assign_E8,
-                  "__ghdl_signal_simple_assign_e8");
-   pragma Export (C, Ghdl_Signal_Start_Assign_E8,
-                  "__ghdl_signal_start_assign_e8");
-   pragma Export (C, Ghdl_Signal_Next_Assign_E8,
-                  "__ghdl_signal_next_assign_e8");
-   pragma Export (C, Ghdl_Signal_Driving_Value_E8,
-                  "__ghdl_signal_driving_value_e8");
-
-   pragma Export (C, Ghdl_Create_Signal_E32,
-                  "__ghdl_create_signal_e32");
-   pragma Export (C, Ghdl_Signal_Init_E32,
-                  "__ghdl_signal_init_e32");
-   pragma Export (C, Ghdl_Signal_Associate_E32,
-                  "__ghdl_signal_associate_e32");
-   pragma Export (C, Ghdl_Signal_Simple_Assign_E32,
-                  "__ghdl_signal_simple_assign_e32");
-   pragma Export (C, Ghdl_Signal_Start_Assign_E32,
-                  "__ghdl_signal_start_assign_e32");
-   pragma Export (C, Ghdl_Signal_Next_Assign_E32,
-                  "__ghdl_signal_next_assign_e32");
-   pragma Export (C, Ghdl_Signal_Driving_Value_E32,
-                  "__ghdl_signal_driving_value_e32");
-
-   pragma Export (C, Ghdl_Create_Signal_I32,
-                  "__ghdl_create_signal_i32");
-   pragma Export (C, Ghdl_Signal_Init_I32,
-                  "__ghdl_signal_init_i32");
-   pragma Export (C, Ghdl_Signal_Associate_I32,
-                  "__ghdl_signal_associate_i32");
-   pragma Export (C, Ghdl_Signal_Simple_Assign_I32,
-                  "__ghdl_signal_simple_assign_i32");
-   pragma Export (C, Ghdl_Signal_Start_Assign_I32,
-                  "__ghdl_signal_start_assign_i32");
-   pragma Export (C, Ghdl_Signal_Next_Assign_I32,
-                  "__ghdl_signal_next_assign_i32");
-   pragma Export (C, Ghdl_Signal_Driving_Value_I32,
-                  "__ghdl_signal_driving_value_i32");
-
-   pragma Export (C, Ghdl_Create_Signal_I64,
-                  "__ghdl_create_signal_i64");
-   pragma Export (C, Ghdl_Signal_Init_I64,
-                  "__ghdl_signal_init_i64");
-   pragma Export (C, Ghdl_Signal_Associate_I64,
-                  "__ghdl_signal_associate_i64");
-   pragma Export (C, Ghdl_Signal_Simple_Assign_I64,
-                  "__ghdl_signal_simple_assign_i64");
-   pragma Export (C, Ghdl_Signal_Start_Assign_I64,
-                  "__ghdl_signal_start_assign_i64");
-   pragma Export (C, Ghdl_Signal_Next_Assign_I64,
-                  "__ghdl_signal_next_assign_i64");
-   pragma Export (C, Ghdl_Signal_Driving_Value_I64,
-                  "__ghdl_signal_driving_value_i64");
-
-   pragma Export (C, Ghdl_Create_Signal_F64,
-                  "__ghdl_create_signal_f64");
-   pragma Export (C, Ghdl_Signal_Init_F64,
-                  "__ghdl_signal_init_f64");
-   pragma Export (C, Ghdl_Signal_Associate_F64,
-                  "__ghdl_signal_associate_f64");
-   pragma Export (C, Ghdl_Signal_Simple_Assign_F64,
-                  "__ghdl_signal_simple_assign_f64");
-   pragma Export (C, Ghdl_Signal_Start_Assign_F64,
-                  "__ghdl_signal_start_assign_f64");
-   pragma Export (C, Ghdl_Signal_Next_Assign_F64,
-                  "__ghdl_signal_next_assign_f64");
-   pragma Export (C, Ghdl_Signal_Driving_Value_F64,
-                  "__ghdl_signal_driving_value_f64");
-
-   pragma Export (C, Ghdl_Process_Add_Driver,
-                  "__ghdl_process_add_driver");
-   pragma Export (C, Ghdl_Signal_Add_Direct_Driver,
-                  "__ghdl_signal_add_direct_driver");
-
-   pragma Export (C, Ghdl_Signal_Add_Source,
-                  "__ghdl_signal_add_source");
-   pragma Export (C, Ghdl_Signal_Effective_Value,
-                  "__ghdl_signal_effective_value");
-   pragma Export (C, Ghdl_Signal_In_Conversion,
-                  "__ghdl_signal_in_conversion");
-   pragma Export (C, Ghdl_Signal_Out_Conversion,
-                  "__ghdl_signal_out_conversion");
-
-   pragma Export (C, Ghdl_Signal_Create_Resolution,
-                  "__ghdl_signal_create_resolution");
-
-   pragma Export (C, Ghdl_Create_Stable_Signal,
-                  "__ghdl_create_stable_signal");
-   pragma Export (C, Ghdl_Create_Quiet_Signal,
-                  "__ghdl_create_quiet_signal");
-   pragma Export (C, Ghdl_Create_Transaction_Signal,
-                  "__ghdl_create_transaction_signal");
-   pragma Export (C, Ghdl_Signal_Attribute_Register_Prefix,
-                  "__ghdl_signal_attribute_register_prefix");
-   pragma Export (C, Ghdl_Create_Delayed_Signal,
-                  "__ghdl_create_delayed_signal");
-
-   pragma Export (Ada, Ghdl_Signal_Create_Guard,
-                  "__ghdl_signal_create_guard");
-   pragma Export (C, Ghdl_Signal_Guard_Dependence,
-                  "__ghdl_signal_guard_dependence");
-
-   pragma Export (C, Ghdl_Signal_Get_Nbr_Ports,
-                  "__ghdl_signal_get_nbr_ports");
-   pragma Export (C, Ghdl_Signal_Get_Nbr_Drivers,
-                  "__ghdl_signal_get_nbr_drivers");
-   pragma Export (C, Ghdl_Signal_Read_Port,
-                  "__ghdl_signal_read_port");
-   pragma Export (C, Ghdl_Signal_Read_Driver,
-                  "__ghdl_signal_read_driver");
-
-   pragma Export (C, Ghdl_Signal_Active_Chain,
-                  "__ghdl_signal_active_chain");
-
-end Grt.Signals;