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diff --git a/src/synth/synth-vhdl_heap.adb b/src/synth/synth-vhdl_heap.adb
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+++ b/src/synth/synth-vhdl_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, see <gnu.org/licenses>.
+
+with Types; use Types;
+with Tables;
+
+
+package body Synth.Vhdl_Heap is
+
+   package Heap_Table is new Tables
+     (Table_Component_Type => Valtyp,
+      Table_Index_Type => Heap_Index,
+      Table_Low_Bound => 1,
+      Table_Initial => 16);
+
+   function Alloc_Mem (Sz : Size_Type) return Memory_Ptr;
+   pragma Import (C, Alloc_Mem, "malloc");
+
+   function Allocate_Memory (T : Type_Acc) return Value_Acc
+   is
+      M : Memory_Ptr;
+   begin
+      M := Alloc_Mem (T.Sz);
+      return new Value_Type'(Kind => Value_Memory, Mem => M);
+   end Allocate_Memory;
+
+   function Allocate_By_Type (T : Type_Acc) return Value_Acc
+   is
+      Res : Value_Acc;
+   begin
+      Res := Allocate_Memory (T);
+      Write_Value_Default (Res.Mem, T);
+      return Res;
+   end Allocate_By_Type;
+
+   function Allocate_By_Type (T : Type_Acc) return Heap_Index is
+   begin
+      --  FIXME: allocate type.
+      Heap_Table.Append ((T, Allocate_By_Type (T)));
+      return Heap_Table.Last;
+   end Allocate_By_Type;
+
+   function Allocate_By_Value (V : Valtyp) return Value_Acc
+   is
+      Res : Value_Acc;
+   begin
+      Res := Allocate_Memory (V.Typ);
+      Write_Value (Res.Mem, V);
+      return Res;
+   end Allocate_By_Value;
+
+   function Allocate_By_Value (V : Valtyp) return Heap_Index is
+   begin
+      Heap_Table.Append ((V.Typ, Allocate_By_Value (V)));
+      return Heap_Table.Last;
+   end Allocate_By_Value;
+
+   function Synth_Dereference (Idx : Heap_Index) return Valtyp is
+   begin
+      return Heap_Table.Table (Idx);
+   end Synth_Dereference;
+
+   procedure Free (Obj : in out Valtyp) is
+   begin
+      -- TODO
+      Obj := No_Valtyp;
+   end Free;
+
+   procedure Synth_Deallocate (Idx : Heap_Index) is
+   begin
+      if Heap_Table.Table (Idx) = No_Valtyp then
+         return;
+      end if;
+      Free (Heap_Table.Table (Idx));
+   end Synth_Deallocate;
+
+end Synth.Vhdl_Heap;