--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/tree-iterator.h	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,122 @@
+/* Iterator routines for manipulating GENERIC and GIMPLE tree statements.
+   Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
+   Contributed by Andrew MacLeod  <amacleod@redhat.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/>.  */
+
+
+/* This file is dependent upon the implementation of tree's. It provides an
+   abstract interface to the tree objects such that if all tree creation and
+   manipulations are done through this interface, we can easily change the
+   implementation of tree's, and not impact other code.  */
+
+#ifndef GCC_TREE_ITERATOR_H
+#define GCC_TREE_ITERATOR_H 1
+
+/* Iterator object for GENERIC or GIMPLE TREE statements.  */
+
+typedef struct {
+  struct tree_statement_list_node *ptr;
+  tree container;
+} tree_stmt_iterator;
+
+static inline tree_stmt_iterator
+tsi_start (tree t)
+{
+  tree_stmt_iterator i;
+
+  i.ptr = STATEMENT_LIST_HEAD (t);
+  i.container = t;
+
+  return i;
+}
+
+static inline tree_stmt_iterator
+tsi_last (tree t)
+{
+  tree_stmt_iterator i;
+
+  i.ptr = STATEMENT_LIST_TAIL (t);
+  i.container = t;
+
+  return i;
+}
+
+static inline bool
+tsi_end_p (tree_stmt_iterator i)
+{
+  return i.ptr == NULL;
+}
+
+static inline bool
+tsi_one_before_end_p (tree_stmt_iterator i)
+{
+  return i.ptr != NULL && i.ptr->next == NULL;
+}
+
+static inline void
+tsi_next (tree_stmt_iterator *i)
+{
+  i->ptr = i->ptr->next;
+}
+
+static inline void
+tsi_prev (tree_stmt_iterator *i)
+{
+  i->ptr = i->ptr->prev;
+}
+
+static inline tree *
+tsi_stmt_ptr (tree_stmt_iterator i)
+{
+  return &i.ptr->stmt;
+}
+
+static inline tree
+tsi_stmt (tree_stmt_iterator i)
+{
+  return i.ptr->stmt;
+}
+
+enum tsi_iterator_update
+{
+  TSI_NEW_STMT,		/* Only valid when single statement is added, move
+			   iterator to it.  */
+  TSI_SAME_STMT,	/* Leave the iterator at the same statement.  */
+  TSI_CHAIN_START,	/* Only valid when chain of statements is added, move
+			   iterator to the first statement in the chain.  */
+  TSI_CHAIN_END,	/* Only valid when chain of statements is added, move
+			   iterator to the last statement in the chain.  */
+  TSI_CONTINUE_LINKING	/* Move iterator to whatever position is suitable for
+			   linking other statements/chains of statements in
+			   the same direction.  */
+};
+
+extern void tsi_link_before (tree_stmt_iterator *, tree,
+			     enum tsi_iterator_update);
+extern void tsi_link_after (tree_stmt_iterator *, tree,
+			    enum tsi_iterator_update);
+
+void tsi_delink (tree_stmt_iterator *);
+
+tree tsi_split_statement_list_after (const tree_stmt_iterator *);
+tree tsi_split_statement_list_before (tree_stmt_iterator *);
+
+void append_to_statement_list (tree, tree *);
+void append_to_statement_list_force (tree, tree *);
+
+#endif /* GCC_TREE_ITERATOR_H  */