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diff --git a/src/synth/synth-heap.adb b/src/synth/synth-heap.adb
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+++ b/src/synth/synth-heap.adb
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+--  Heap for synthesis.
+--  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 Types; use Types;
+with Tables;
+
+with Vhdl.Nodes; use Vhdl.Nodes;
+
+package body Synth.Heap is
+
+   package Heap_Table is new Tables
+     (Table_Component_Type => Value_Acc,
+      Table_Index_Type => Heap_Index,
+      Table_Low_Bound => 1,
+      Table_Initial => 16);
+
+   function Allocate_By_Type (T : Type_Acc) return Value_Acc is
+   begin
+      case T.Kind is
+         when Type_Bit
+           | Type_Logic =>
+            return new Value_Type'
+              (Kind => Value_Discrete, Typ => T, Scal => 0);
+         when Type_Discrete =>
+            return new Value_Type'
+              (Kind => Value_Discrete, Typ => T, Scal => T.Drange.Left);
+         when Type_Array =>
+            declare
+               Len : constant Uns32 := Get_Array_Flat_Length (T);
+               El_Typ : constant Type_Acc := Get_Array_Element (T);
+               Arr : Value_Array_Acc;
+            begin
+               Arr := new Value_Array_Type (Iir_Index32 (Len));
+               for I in Arr.V'Range loop
+                  Arr.V (I) := Allocate_By_Type (El_Typ);
+               end loop;
+               return new Value_Type'
+                 (Kind => Value_Const_Array, Typ => T, Arr => Arr);
+            end;
+         when others =>
+            raise Internal_Error;
+      end case;
+   end Allocate_By_Type;
+
+   function Allocate_By_Type (T : Type_Acc) return Heap_Index is
+   begin
+      --  FIXME: allocate type.
+      Heap_Table.Append (Allocate_By_Type (T));
+      return Heap_Table.Last;
+   end Allocate_By_Type;
+
+   function Allocate_By_Value (V : Value_Acc) return Heap_Index is
+   begin
+      raise Internal_Error;
+      return Null_Heap_Index;
+   end Allocate_By_Value;
+
+   function Synth_Dereference (Idx : Heap_Index) return Value_Acc is
+   begin
+      return Heap_Table.Table (Idx);
+   end Synth_Dereference;
+
+   procedure Free (Obj : in out Value_Acc) is
+   begin
+      -- TODO
+      Obj := null;
+   end Free;
+
+   procedure Synth_Deallocate (Idx : Heap_Index) is
+   begin
+      if Heap_Table.Table (Idx) = null then
+         return;
+      end if;
+      Free (Heap_Table.Table (Idx));
+   end Synth_Deallocate;
+
+end Synth.Heap;