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/* Exported functions from alias.c

   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 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_ALIAS_H

#define GCC_ALIAS_H

#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 */