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diff --git a/gcc/tree-simple.h b/gcc/tree-simple.h
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+/* Functions to analyze and validate GIMPLE trees.
+   Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+   Contributed by Diego Novillo <dnovillo@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 2, 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 COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#ifndef _TREE_SIMPLE_H
+#define _TREE_SIMPLE_H 1
+
+
+#include "tree-iterator.h"
+
+extern tree create_tmp_var_raw (tree, const char *);
+extern tree create_tmp_var (tree, const char *);
+extern bool is_gimple_tmp_var (tree);
+extern tree get_initialized_tmp_var (tree, tree *, tree *);
+extern tree get_formal_tmp_var (tree, tree *);
+extern void declare_tmp_vars (tree, tree);
+
+extern tree rationalize_compound_expr (tree);
+extern tree right_assocify_expr (tree);
+extern void annotate_all_with_locus (tree *, location_t);
+
+/* Validation of GIMPLE expressions.  Note that these predicates only check
+   the basic form of the expression, they don't recurse to make sure that
+   underlying nodes are also of the right form.  */
+
+/* Returns true iff T is a valid GIMPLE statement.  */
+bool is_gimple_stmt (tree);
+
+/* Returns true iff TYPE is a valid type for a scalar register variable.  */
+bool is_gimple_reg_type (tree);
+/* Returns true iff T is a scalar register variable.  */
+bool is_gimple_reg (tree);
+/* Returns true iff T is any sort of variable.  */
+bool is_gimple_variable (tree);
+/* Returns true iff T is a variable or an INDIRECT_REF (of a variable).  */
+bool is_gimple_min_lval (tree);
+/* Returns true iff T is an lvalue other than an INDIRECT_REF.  */
+bool is_gimple_addr_expr_arg (tree);
+/* Returns true iff T is any valid GIMPLE lvalue.  */
+bool is_gimple_lvalue (tree);
+
+/* Returns true iff T is a GIMPLE restricted function invariant.  */
+bool is_gimple_min_invariant (tree);
+/* Returns true iff T is a GIMPLE rvalue.  */
+bool is_gimple_val (tree);
+/* Returns true iff T is a valid rhs for a MODIFY_EXPR.  */
+bool is_gimple_rhs (tree);
+
+/* Returns true iff T is a valid if-statement condition.  */
+bool is_gimple_condexpr (tree);
+
+/* Returns true iff T is a type conversion.  */
+bool is_gimple_cast (tree);
+/* Returns true iff T is a valid CONSTRUCTOR element (either an rvalue or
+   another CONSTRUCTOR).  */
+bool is_gimple_constructor_elt (tree);
+/* Returns true iff T is a variable that does not need to live in memory.  */
+bool is_gimple_non_addressable (tree t);
+
+/* If T makes a function call, returns the CALL_EXPR operand.  */
+tree get_call_expr_in (tree t);
+
+void recalculate_side_effects (tree);
+
+void append_to_statement_list (tree, tree *);
+void append_to_statement_list_force (tree, tree *);
+void append_to_compound_expr (tree, tree *);
+
+/* FIXME we should deduce this from the predicate.  */
+typedef enum fallback_t {
+  fb_none = 0,
+  fb_rvalue = 1,
+  fb_lvalue = 2,
+  fb_mayfail = 4,
+  fb_either= fb_rvalue | fb_lvalue
+} fallback_t;
+
+enum gimplify_status {
+  GS_ERROR	= -2,	/* Something Bad Seen.  */
+  GS_UNHANDLED	= -1,	/* A langhook result for "I dunno".  */
+  GS_OK		= 0,	/* We did something, maybe more to do.  */
+  GS_ALL_DONE	= 1	/* The expression is fully gimplified.  */
+};
+
+enum gimplify_status gimplify_expr (tree *, tree *, tree *,
+				    bool (*) (tree), fallback_t);
+void gimplify_stmt (tree *);
+void gimplify_to_stmt_list (tree *);
+void gimplify_body (tree *, tree);
+void push_gimplify_context (void);
+void pop_gimplify_context (tree);
+
+/* Miscellaneous helpers.  */
+tree get_base_address (tree t);
+void gimple_add_tmp_var (tree);
+tree gimple_current_bind_expr (void);
+void gimple_push_bind_expr (tree);
+void gimple_pop_bind_expr (void);
+void unshare_all_trees (tree);
+tree voidify_wrapper_expr (tree);
+tree gimple_build_eh_filter (tree, tree, tree);
+tree build_and_jump (tree *);
+tree alloc_stmt_list (void);
+void free_stmt_list (tree);
+tree force_labels_r (tree *, int *, void *);
+
+/* In tree-nested.c.  */
+extern void lower_nested_functions (tree);
+
+#endif /* _TREE_SIMPLE_H  */