Uniquization of constants at the Tree level

[pf3gnuchains/gcc-fork.git] / gcc / alias.h

diff --git a/gcc/alias.h b/gcc/alias.h
index ea78e80..5907215 100644 (file)
--- a/gcc/alias.h
+++ b/gcc/alias.h
@@ -1,11 +1,11 @@
 /* Exported functions from alias.c
-   Copyright (C) 2004 Free Software Foundation, Inc.
+   Copyright (C) 2004, 2007, 2008, 2009 Free Software Foundation, Inc.
 
 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
+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
@@ -14,17 +14,41 @@ 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.  */
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
 
 #ifndef GCC_ALIAS_H
 #define GCC_ALIAS_H
 
-extern HOST_WIDE_INT new_alias_set (void);
-extern HOST_WIDE_INT get_varargs_alias_set (void);
-extern HOST_WIDE_INT get_frame_alias_set (void);
-extern void record_base_value (unsigned int, rtx, int);
-extern int can_address_p (tree);
+#include "coretypes.h"
+
+/* The type of an alias set.  Code currently assumes that variables of
+   this type can take the values 0 (the alias set which aliases
+   everything) and -1 (sometimes indicating that the alias set is
+   unknown, sometimes indicating a memory barrier) and -2 (indicating
+   that the alias set should be set to a unique value but has not been
+   set yet).  */
+typedef int alias_set_type;
+
+extern alias_set_type new_alias_set (void);
+extern alias_set_type get_alias_set (tree);
+extern alias_set_type get_deref_alias_set (tree);
+extern alias_set_type get_varargs_alias_set (void);
+extern alias_set_type get_frame_alias_set (void);
+extern bool component_uses_parent_alias_set (const_tree);
+extern bool alias_set_subset_of (alias_set_type, alias_set_type);
+extern void record_alias_subset (alias_set_type, alias_set_type);
+extern void record_component_aliases (tree);
+extern int alias_sets_conflict_p (alias_set_type, alias_set_type);
+extern int alias_sets_must_conflict_p (alias_set_type, alias_set_type);
+extern int objects_must_conflict_p (tree, tree);
+extern int nonoverlapping_memrefs_p (const_rtx, const_rtx);
+extern bool insn_alias_sets_conflict_p (rtx, rtx);
+
+/* This alias set can be used to force a memory to conflict with all
+   other memories, creating a barrier across which no memory reference
+   can move.  Note that there are other legacy ways to create such
+   memory barriers, including an address of SCRATCH.  */
+#define ALIAS_SET_MEMORY_BARRIER       ((alias_set_type) -1)
 
 #endif /* GCC_ALIAS_H */