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/* Tree based points-to analysis

   Copyright (C) 2002, 2003, 2007 Free Software Foundation, Inc.

   Contributed by Daniel Berlin <dberlin@dberlin.org>

   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_STRUCTALIAS_H

#define TREE_SSA_STRUCTALIAS_H

/* True if the data pointed to by PTR can alias anything.  */

#define PTR_IS_REF_ALL(PTR) TYPE_REF_CAN_ALIAS_ALL (TREE_TYPE (PTR))

struct constraint;

typedef struct constraint *constraint_t;

/* Alias information used by compute_may_aliases and its helpers.  */

struct alias_info

{

  /* SSA names visited while collecting points-to information.  If bit I

     is set, it means that SSA variable with version I has already been

     visited.  */

  sbitmap ssa_names_visited;

  /* Array of SSA_NAME pointers processed by the points-to collector.  */

  VEC(tree,heap) *processed_ptrs;

  /* ADDRESSABLE_VARS contains all the global variables and locals that

     have had their address taken.  */

  struct alias_map_d **addressable_vars;

  size_t num_addressable_vars;

  /* POINTERS contains all the _DECL pointers with unique memory tags

     that have been referenced in the program.  */

  struct alias_map_d **pointers;

  size_t num_pointers;

  /* Number of function calls found in the program.  */

  size_t num_calls_found;

  /* Number of const/pure function calls found in the program.  */

  size_t num_pure_const_calls_found;

  /* Total number of virtual operands that will be needed to represent

     all the aliases of all the pointers found in the program.  */

  long total_alias_vops;

  /* Variables that have been written to.  */

  bitmap written_vars;

  /* Pointers that have been used in an indirect store operation.  */

  bitmap dereferenced_ptrs_store;

  /* Pointers that have been used in an indirect load operation.  */

  bitmap dereferenced_ptrs_load;

  /* Memory tag for all the PTR_IS_REF_ALL pointers.  */

  tree ref_all_symbol_mem_tag;

};

/* Keep track of how many times each pointer has been dereferenced in

   the program using the aux variable.  This is used by the alias

   grouping heuristic in compute_flow_insensitive_aliasing.  */

#define NUM_REFERENCES(ANN) ((size_t)((ANN)->common.aux))

#define NUM_REFERENCES_CLEAR(ANN) ((ANN)->common.aux) = 0

#define NUM_REFERENCES_INC(ANN) (ANN)->common.aux = (void*) (((size_t)((ANN)->common.aux)) + 1)

#define NUM_REFERENCES_SET(ANN, VAL) (ANN)->common.aux = (void*) ((void *)(VAL))

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

enum escape_type is_escape_site (tree);

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

extern void compute_points_to_sets (struct alias_info *);

extern void delete_points_to_sets (void);

extern void dump_constraint (FILE *, constraint_t);

extern void dump_constraints (FILE *);

extern void debug_constraint (constraint_t);

extern void debug_constraints (void);

extern void dump_solution_for_var (FILE *, unsigned int);

extern void debug_solution_for_var (unsigned int);

extern void dump_sa_points_to_info (FILE *);

extern void debug_sa_points_to_info (void);

#endif /* TREE_SSA_STRUCTALIAS_H  */