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diff --git a/gcc/tree-streamer.h b/gcc/tree-streamer.h
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+/* Data structures and functions for streaming trees.
+
+   Copyright 2011 Free Software Foundation, Inc.
+   Contributed by Diego Novillo <dnovillo@google.com>
+
+This file is part of GCC.
+
+GCC 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 3, or (at your option) any later
+version.
+
+GCC 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 GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_TREE_STREAMER_H
+#define GCC_TREE_STREAMER_H
+
+#include "tree.h"
+#include "lto-streamer.h"
+
+/* Cache of pickled nodes.  Used to avoid writing the same node more
+   than once.  The first time a tree node is streamed out, it is
+   entered in this cache.  Subsequent references to the same node are
+   resolved by looking it up in this cache.
+
+   This is used in two ways:
+
+   - On the writing side, the first time T is added to STREAMER_CACHE,
+     a new reference index is created for T and T is emitted on the
+     stream.  If T needs to be emitted again to the stream, instead of
+     pickling it again, the reference index is emitted.
+
+   - On the reading side, the first time T is read from the stream, it
+     is reconstructed in memory and a new reference index created for
+     T.  The reconstructed T is inserted in some array so that when
+     the reference index for T is found in the input stream, it can be
+     used to look up into the array to get the reconstructed T.  */
+struct lto_streamer_cache_d
+{
+  /* The mapping between tree nodes and slots into the nodes array.  */
+  struct pointer_map_t *node_map;
+
+  /* The nodes pickled so far.  */
+  VEC(tree,heap) *nodes;
+};
+
+/* In tree-streamer-in.c.  */
+tree input_string_cst (struct data_in *, struct lto_input_block *);
+tree lto_input_tree (struct lto_input_block *, struct data_in *);
+void lto_streamer_read_tree (struct lto_input_block *,
+				     struct data_in *, tree);
+
+/* In tree-streamer-out.c.  */
+void lto_streamer_write_tree (struct output_block *, tree, bool);
+
+/* In tree-streamer.c.  */
+void check_handled_ts_structures (void);
+bool lto_streamer_cache_insert (struct lto_streamer_cache_d *, tree,
+ 			        unsigned *);
+bool lto_streamer_cache_insert_at (struct lto_streamer_cache_d *, tree,
+ 				   unsigned);
+void lto_streamer_cache_append (struct lto_streamer_cache_d *, tree);
+bool lto_streamer_cache_lookup (struct lto_streamer_cache_d *, tree,
+ 			        unsigned *);
+tree lto_streamer_cache_get (struct lto_streamer_cache_d *, unsigned);
+struct lto_streamer_cache_d *lto_streamer_cache_create (void);
+void lto_streamer_cache_delete (struct lto_streamer_cache_d *);
+
+#endif  /* GCC_TREE_STREAMER_H  */