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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [tree-ssa-alias.h] - Blame information for rev 859

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1 280 jeremybenn
/* Tree based alias analysis and alias oracle.
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   Copyright (C) 2008 Free Software Foundation, Inc.
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   Contributed by Richard Guenther  <rguenther@suse.de>
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   This file is part of GCC.
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   GCC is free software; you can redistribute it and/or modify
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   under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   GCC is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with GCC; see the file COPYING3.  If not see
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   <http://www.gnu.org/licenses/>.  */
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#ifndef TREE_SSA_ALIAS_H
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#define TREE_SSA_ALIAS_H
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#include "coretypes.h"
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/* The points-to solution.
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   The points-to solution is a union of pt_vars and the abstract
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   sets specified by the flags.  */
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struct GTY(()) pt_solution
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{
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  /* Nonzero if points-to analysis couldn't determine where this pointer
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     is pointing to.  */
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  unsigned int anything : 1;
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  /* Nonzero if the points-to set includes any global memory.  Note that
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     even if this is zero pt_vars can still include global variables.  */
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  unsigned int nonlocal : 1;
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  /* Nonzero if the points-to set includes any escaped local variable.  */
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  unsigned int escaped : 1;
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  /* Nonzero if the points-to set includes 'nothing', the points-to set
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     includes memory at address NULL.  */
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  unsigned int null : 1;
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  /* Nonzero if the pt_vars bitmap includes a global variable.  */
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  unsigned int vars_contains_global : 1;
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  /* Nonzero if the pt_vars bitmap includes a restrict tag variable.  */
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  unsigned int vars_contains_restrict : 1;
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  /* Set of variables that this pointer may point to.  */
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  bitmap vars;
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};
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/* Simplified and cached information about a memory reference tree.
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   Used by the alias-oracle internally and externally in alternate
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   interfaces.  */
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typedef struct ao_ref_s
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{
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  /* The original full memory reference tree or NULL_TREE if that is
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     not available.  */
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  tree ref;
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  /* The following fields are the decomposed reference as returned
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     by get_ref_base_and_extent.  */
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  /* The base object of the memory reference or NULL_TREE if all of
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     the following fields are not yet computed.  */
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  tree base;
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  /* The offset relative to the base.  */
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  HOST_WIDE_INT offset;
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  /* The size of the access.  */
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  HOST_WIDE_INT size;
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  /* The maximum possible extent of the access or -1 if unconstrained.  */
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  HOST_WIDE_INT max_size;
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  /* The alias set of the access or -1 if not yet computed.  */
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  alias_set_type ref_alias_set;
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  /* The alias set of the base object or -1 if not yet computed.  */
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  alias_set_type base_alias_set;
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} ao_ref;
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/* In tree-ssa-alias.c  */
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extern void ao_ref_init (ao_ref *, tree);
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extern void ao_ref_init_from_ptr_and_size (ao_ref *, tree, tree);
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extern tree ao_ref_base (ao_ref *);
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extern alias_set_type ao_ref_alias_set (ao_ref *);
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extern bool ptr_deref_may_alias_global_p (tree);
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extern bool refs_may_alias_p (tree, tree);
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extern bool refs_may_alias_p_1 (ao_ref *, ao_ref *, bool);
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extern bool refs_anti_dependent_p (tree, tree);
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extern bool refs_output_dependent_p (tree, tree);
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extern bool ref_maybe_used_by_stmt_p (gimple, tree);
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extern bool stmt_may_clobber_ref_p (gimple, tree);
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extern bool stmt_may_clobber_ref_p_1 (gimple, ao_ref *);
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extern tree get_continuation_for_phi (gimple, ao_ref *, bitmap *);
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extern void *walk_non_aliased_vuses (ao_ref *, tree,
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                                     void *(*)(ao_ref *, tree, void *),
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                                     void *(*)(ao_ref *, tree, void *), void *);
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extern unsigned int walk_aliased_vdefs (ao_ref *, tree,
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                                        bool (*)(ao_ref *, tree, void *),
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                                        void *, bitmap *);
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extern struct ptr_info_def *get_ptr_info (tree);
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extern void dump_alias_info (FILE *);
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extern void debug_alias_info (void);
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extern void dump_points_to_solution (FILE *, struct pt_solution *);
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extern void dump_points_to_info_for (FILE *, tree);
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extern void debug_points_to_info_for (tree);
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extern void dump_alias_stats (FILE *);
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/* In tree-ssa-structalias.c  */
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extern unsigned int compute_may_aliases (void);
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extern void delete_alias_heapvars (void);
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extern bool pt_solution_includes_global (struct pt_solution *);
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extern bool pt_solution_includes (struct pt_solution *, const_tree);
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extern bool pt_solutions_intersect (struct pt_solution *, struct pt_solution *);
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extern bool pt_solutions_same_restrict_base (struct pt_solution *,
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                                             struct pt_solution *);
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extern void pt_solution_reset (struct pt_solution *);
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extern void pt_solution_set (struct pt_solution *, bitmap);
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extern void dump_pta_stats (FILE *);
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#endif /* TREE_SSA_ALIAS_H  */

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