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diff --git a/interpreter/preprocessor/faust-0.9.47mr3/compiler/tlib/shlysis.hh b/interpreter/preprocessor/faust-0.9.47mr3/compiler/tlib/shlysis.hh
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+/************************************************************************
+ ************************************************************************
+    FAUST compiler
+	Copyright (C) 2003-2004 GRAME, Centre National de Creation Musicale
+    ---------------------------------------------------------------------
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ ************************************************************************
+ ************************************************************************/
+ 
+ 
+ 
+#ifndef __SHLYSIS__
+#define __SHLYSIS__
+/*****************************************************************************
+******************************************************************************
+								Tree Sharing Analysis
+						Y. Orlarey, (c) Grame 2002
+------------------------------------------------------------------------------
+The sharing analysis of tree t is the annotation of all its subtrees t' 
+with their number of occurences in t. As this annotation of t' depends of
+a context (the tree t for which t' is a subtree) a specific property key
+unique to each sharing analysis must be generated.
+
+ API:
+ ---- 
+	
+	shprkey(t) -> k		= unique sharing property key of t
+	shcount(k,t') -> n	= returns the number of occurences of t' in t (where k = shprkey(t))
+	shlysis(t)	-> k	= annotated the subtrees of t with prop (key sharing-count)
+						  (0 if t' is not a subtree of t)
+
+ History :
+ ---------
+ 	2002-04-08 : First version
+	
+******************************************************************************
+*****************************************************************************/
+
+#include    <string.h>
+#include    <stdlib.h>
+#include    <stdio.h>
+
+#include 	"list.hh"
+
+
+typedef bool (*barrier)(const Tree& t);
+
+//------------------------------------------------------------------------------
+// shprkey : Create a specific property key for the sharing count of subtrees of t
+
+Tree shprkey(Tree t);
+
+
+//------------------------------------------------------------------------------
+// shcount : returns the sharing count of t within the tree T of key k
+
+int shcount(Tree key, Tree t);
+
+#if 0
+
+//------------------------------------------------------------------------------
+// shlysis : create a specific property key for the sharing count of subtrees of t
+
+Tree shlysis(Tree t);
+
+Tree shlysis(Tree t, barrier foo);
+#endif
+#endif