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diff --git a/src/simulate/simulation.ads b/src/simulate/simulation.ads
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+--  Interpreted simulation
+--  Copyright (C) 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 GHDL; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+
+with System;
+with Grt.Types; use Grt.Types;
+with Iirs; use Iirs;
+with Iir_Values; use Iir_Values;
+with Elaboration; use Elaboration;
+with Execution; use Execution;
+
+package Simulation is
+   Trace_Simulation : Boolean := False;
+   Disp_Tree : Boolean := False;
+   Disp_Stats : Boolean := False;
+   Disp_Ams : Boolean := False;
+   Flag_Debugger : Boolean := False;
+   Flag_Interractive : Boolean := False;
+
+   type Resolv_Instance_Type is record
+      Func : Iir;
+      Block : Block_Instance_Acc;
+      Sig : Iir_Value_Literal_Acc;
+   end record;
+   type Resolv_Instance_Acc is access Resolv_Instance_Type;
+
+   --  The resolution procedure for GRT.
+   procedure Resolution_Proc (Instance_Addr : System.Address;
+                              Val : System.Address;
+                              Bool_Vec : System.Address;
+                              Vec_Len : Ghdl_Index_Type;
+                              Nbr_Drv : Ghdl_Index_Type;
+                              Nbr_Ports : Ghdl_Index_Type);
+   pragma Convention (C, Resolution_Proc);
+
+   type Guard_Instance_Type is record
+      Instance : Block_Instance_Acc;
+      Guard : Iir;
+   end record;
+
+   type Guard_Instance_Acc is access Guard_Instance_Type;
+
+   function Guard_Func (Data : System.Address) return Ghdl_B1;
+   pragma Convention (C, Guard_Func);
+
+   --  The entry point of the simulator.
+   procedure Simulation_Entity (Top_Conf : Iir_Design_Unit);
+
+   type Process_State_Array is
+      array (Process_Index_Type range <>) of aliased Process_State_Type;
+   type Process_State_Array_Acc is access Process_State_Array;
+
+   --  Array containing all processes.
+   Processes_State: Process_State_Array_Acc;
+
+   function Execute_Signal_Value (Indirect: Iir_Value_Literal_Acc)
+                                 return Iir_Value_Literal_Acc;
+
+   function Execute_Event_Attribute (Lit: Iir_Value_Literal_Acc)
+                                    return Boolean;
+
+   function Execute_Active_Attribute (Lit: Iir_Value_Literal_Acc)
+                                     return Boolean;
+   function Execute_Driving_Attribute (Lit: Iir_Value_Literal_Acc)
+                                      return Boolean;
+
+   function Execute_Last_Value_Attribute (Indirect: Iir_Value_Literal_Acc)
+                                         return Iir_Value_Literal_Acc;
+   function Execute_Driving_Value_Attribute (Indirect: Iir_Value_Literal_Acc)
+                                            return Iir_Value_Literal_Acc;
+
+   --  Return the Last_Event absolute time.
+   function Execute_Last_Event_Attribute (Indirect: Iir_Value_Literal_Acc)
+                                         return Ghdl_I64;
+   function Execute_Last_Active_Attribute (Indirect: Iir_Value_Literal_Acc)
+                                          return Ghdl_I64;
+
+   -- Type for a transaction: it contains the value, the absolute time at which
+   -- the transaction should occur and a pointer to the next transaction.
+   -- This constitute a simple linked list, the elements must be ordered
+   -- according to time.
+   type Transaction_El_Type is record
+      -- The value of the waveform element.
+      -- Can't be an array.
+      -- Life must be target.
+      Value: Iir_Value_Literal_Acc;
+
+      -- After time at which the transaction should occur.
+      After : Grt.Types.Std_Time;
+   end record;
+
+   type Transaction_Array is array (Natural range <>) of Transaction_El_Type;
+
+   type Transaction_Type (Len : Natural) is record
+      -- Statement that created this transaction.  Used to disp location
+      -- in case of error (constraint error).
+      Stmt: Iir;
+
+      Reject : Std_Time;
+
+      Els : Transaction_Array (1 .. Len);
+   end record;
+
+   procedure Assign_Value_To_Signal (Instance: Block_Instance_Acc;
+                                     Target: Iir_Value_Literal_Acc;
+                                     Transaction: Transaction_Type);
+
+   procedure Disconnect_Signal (Sig : Iir_Value_Literal_Acc);
+
+   -- Return true if the process should be suspended.
+   function Execute_Wait_Statement (Instance : Block_Instance_Acc;
+                                    Stmt: Iir_Wait_Statement)
+                                   return Boolean;
+end Simulation;