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diff --git a/src/synth/synth-vhdl_heap.ads b/src/synth/synth-vhdl_heap.ads
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+++ b/src/synth/synth-vhdl_heap.ads
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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 Synth.Objtypes; use Synth.Objtypes;
+with Synth.Values; use Synth.Values;
+
+package Synth.Vhdl_Heap is
+   --  Allocate a value.
+   function Allocate_By_Type (T : Type_Acc) return Heap_Index;
+   function Allocate_By_Value (V : Valtyp) return Heap_Index;
+
+   function Synth_Dereference (Idx : Heap_Index) return Valtyp;
+
+   procedure Synth_Deallocate (Idx : Heap_Index);
+end Synth.Vhdl_Heap;