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diff --git a/src/synth/synth-context.ads b/src/synth/synth-context.ads
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+--  Synthesis context.
+--  Copyright (C) 2017 Tristan Gingold
+--
+--  This file is part of GHDL.
+--
+--  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, write to the Free Software
+--  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+--  MA 02110-1301, USA.
+
+with Synth.Environment; use Synth.Environment;
+with Synth.Values; use Synth.Values;
+with Elaboration; use Elaboration;
+with Netlists; use Netlists;
+with Netlists.Builders;
+with Iirs; use Iirs;
+
+package Synth.Context is
+   type Instance_Map_Array is array (Block_Instance_Id range <>)
+     of Synth_Instance_Acc;
+   type Instance_Map_Array_Acc is access Instance_Map_Array;
+
+   --  Map between simulation instance and synthesis instance.
+   Instance_Map : Instance_Map_Array_Acc;
+
+   Build_Context : Netlists.Builders.Context_Acc;
+
+   function Make_Instance (Sim_Inst : Block_Instance_Acc)
+                          return Synth_Instance_Acc;
+   procedure Free_Instance (Synth_Inst : in out Synth_Instance_Acc);
+
+   procedure Make_Object (Syn_Inst : Synth_Instance_Acc;
+                          Kind : Wire_Kind;
+                          Obj : Iir);
+
+   function Get_Net (Val : Value_Acc) return Net;
+
+   function Get_Value (Inst : Synth_Instance_Acc; Obj : Iir) return Value_Acc;
+
+end Synth.Context;