--- a/gcc/libfuncs.h	Tue May 25 18:58:51 2010 +0900
+++ b/gcc/libfuncs.h	Tue Mar 22 17:18:12 2011 +0900
@@ -1,5 +1,5 @@
 /* Definitions for code generation pass of GNU compiler.
-   Copyright (C) 2001, 2004, 2007, 2008 Free Software Foundation, Inc.
+   Copyright (C) 2001, 2004, 2007, 2008, 2010 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -20,6 +20,8 @@
 #ifndef GCC_LIBFUNCS_H
 #define GCC_LIBFUNCS_H
 
+#include "hashtab.h"
+
 /* Enumeration of indexes into libfunc_table.  */
 enum libfunc_index
 {
@@ -45,9 +47,34 @@
   LTI_MAX
 };
 
-/* SYMBOL_REF rtx's for the library functions that are called
-   implicitly and not via optabs.  */
-extern GTY(()) rtx libfunc_table[LTI_MAX];
+/* Information about an optab-related libfunc.  We use the same hashtable
+   for normal optabs and conversion optabs.  In the first case mode2
+   is unused.  */
+struct GTY(()) libfunc_entry {
+  size_t optab;
+  enum machine_mode mode1, mode2;
+  rtx libfunc;
+};
+
+/* Target-dependent globals.  */
+struct GTY(()) target_libfuncs {
+  /* SYMBOL_REF rtx's for the library functions that are called
+     implicitly and not via optabs.  */
+  rtx x_libfunc_table[LTI_MAX];
+
+  /* Hash table used to convert declarations into nodes.  */
+  htab_t GTY((param_is (struct libfunc_entry))) x_libfunc_hash;
+};
+
+extern GTY(()) struct target_libfuncs default_target_libfuncs;
+#if SWITCHABLE_TARGET
+extern struct target_libfuncs *this_target_libfuncs;
+#else
+#define this_target_libfuncs (&default_target_libfuncs)
+#endif
+
+#define libfunc_table \
+  (this_target_libfuncs->x_libfunc_table)
 
 /* Accessor macros for libfunc_table.  */
 
@@ -71,4 +98,7 @@
 
 #define gcov_flush_libfunc	(libfunc_table[LTI_gcov_flush])
 
+/* In explow.c */
+extern void set_stack_check_libfunc (const char *);
+
 #endif /* GCC_LIBFUNCS_H */