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/* Tree based alias analysis and alias oracle.

   Copyright (C) 2008 Free Software Foundation, Inc.

   Contributed by Richard Guenther  <rguenther@suse.de>

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify

   under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, 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 TREE_SSA_ALIAS_H

#define TREE_SSA_ALIAS_H

#include "coretypes.h"

/* The points-to solution.

   The points-to solution is a union of pt_vars and the abstract

   sets specified by the flags.  */

struct GTY(()) pt_solution

{

  /* Nonzero if points-to analysis couldn't determine where this pointer

     is pointing to.  */

  unsigned int anything : 1;

  /* Nonzero if the points-to set includes any global memory.  Note that

     even if this is zero pt_vars can still include global variables.  */

  unsigned int nonlocal : 1;

  /* Nonzero if the points-to set includes any escaped local variable.  */

  unsigned int escaped : 1;

  /* Nonzero if the points-to set includes 'nothing', the points-to set

     includes memory at address NULL.  */

  unsigned int null : 1;

  /* Nonzero if the pt_vars bitmap includes a global variable.  */

  unsigned int vars_contains_global : 1;

  /* Nonzero if the pt_vars bitmap includes a restrict tag variable.  */

  unsigned int vars_contains_restrict : 1;

  /* Set of variables that this pointer may point to.  */

  bitmap vars;

};

/* Simplified and cached information about a memory reference tree.

   Used by the alias-oracle internally and externally in alternate

   interfaces.  */

typedef struct ao_ref_s

{

  /* The original full memory reference tree or NULL_TREE if that is

     not available.  */

  tree ref;

  /* The following fields are the decomposed reference as returned

     by get_ref_base_and_extent.  */

  /* The base object of the memory reference or NULL_TREE if all of

     the following fields are not yet computed.  */

  tree base;

  /* The offset relative to the base.  */

  HOST_WIDE_INT offset;

  /* The size of the access.  */

  HOST_WIDE_INT size;

  /* The maximum possible extent of the access or -1 if unconstrained.  */

  HOST_WIDE_INT max_size;

  /* The alias set of the access or -1 if not yet computed.  */

  alias_set_type ref_alias_set;

  /* The alias set of the base object or -1 if not yet computed.  */

  alias_set_type base_alias_set;

} ao_ref;

/* In tree-ssa-alias.c  */

extern void ao_ref_init (ao_ref *, tree);

extern void ao_ref_init_from_ptr_and_size (ao_ref *, tree, tree);

extern tree ao_ref_base (ao_ref *);

extern alias_set_type ao_ref_alias_set (ao_ref *);

extern bool ptr_deref_may_alias_global_p (tree);

extern bool refs_may_alias_p (tree, tree);

extern bool refs_may_alias_p_1 (ao_ref *, ao_ref *, bool);

extern bool refs_anti_dependent_p (tree, tree);

extern bool refs_output_dependent_p (tree, tree);

extern bool ref_maybe_used_by_stmt_p (gimple, tree);

extern bool stmt_may_clobber_ref_p (gimple, tree);

extern bool stmt_may_clobber_ref_p_1 (gimple, ao_ref *);

extern tree get_continuation_for_phi (gimple, ao_ref *, bitmap *);

extern void *walk_non_aliased_vuses (ao_ref *, tree,

                                     void *(*)(ao_ref *, tree, void *),

                                     void *(*)(ao_ref *, tree, void *), void *);

extern unsigned int walk_aliased_vdefs (ao_ref *, tree,

                                        bool (*)(ao_ref *, tree, void *),

                                        void *, bitmap *);

extern struct ptr_info_def *get_ptr_info (tree);

extern void dump_alias_info (FILE *);

extern void debug_alias_info (void);

extern void dump_points_to_solution (FILE *, struct pt_solution *);

extern void dump_points_to_info_for (FILE *, tree);

extern void debug_points_to_info_for (tree);

extern void dump_alias_stats (FILE *);

/* In tree-ssa-structalias.c  */

extern unsigned int compute_may_aliases (void);

extern void delete_alias_heapvars (void);

extern bool pt_solution_includes_global (struct pt_solution *);

extern bool pt_solution_includes (struct pt_solution *, const_tree);

extern bool pt_solutions_intersect (struct pt_solution *, struct pt_solution *);

extern bool pt_solutions_same_restrict_base (struct pt_solution *,

                                             struct pt_solution *);

extern void pt_solution_reset (struct pt_solution *);

extern void pt_solution_set (struct pt_solution *, bitmap);

extern void dump_pta_stats (FILE *);

#endif /* TREE_SSA_ALIAS_H  */