+/************************************************************************
+ ************************************************************************
+ 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