gcc/tree-ssa-structalias.h

   1 /* Tree based points-to analysis
   2    Copyright (C) 2002, 2003, 2007 Free Software Foundation, Inc.
   3    Contributed by Daniel Berlin <dberlin@dberlin.org>
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify
   8    under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef TREE_SSA_STRUCTALIAS_H
  22 #define TREE_SSA_STRUCTALIAS_H
  23
  24 /* True if the data pointed to by PTR can alias anything.  */
  25 #define PTR_IS_REF_ALL(PTR) TYPE_REF_CAN_ALIAS_ALL (TREE_TYPE (PTR))
  26
  27 struct constraint;
  28 typedef struct constraint *constraint_t;
  29
  30 /* Alias information used by compute_may_aliases and its helpers.  */
  31 struct alias_info
  32 {
  33   /* SSA names visited while collecting points-to information.  If bit I
  34      is set, it means that SSA variable with version I has already been
  35      visited.  */
  36   sbitmap ssa_names_visited;
  37
  38   /* Array of SSA_NAME pointers processed by the points-to collector.  */
  39   VEC(tree,heap) *processed_ptrs;
  40
  41   /* ADDRESSABLE_VARS contains all the global variables and locals that
  42      have had their address taken.  */
  43   struct alias_map_d **addressable_vars;
  44   size_t num_addressable_vars;
  45
  46   /* POINTERS contains all the _DECL pointers with unique memory tags
  47      that have been referenced in the program.  */
  48   struct alias_map_d **pointers;
  49   size_t num_pointers;
  50
  51   /* Variables that have been written to directly (i.e., not through a
  52      pointer dereference).  */
  53   struct pointer_set_t *written_vars;
  54
  55   /* Pointers that have been used in an indirect store operation.  */
  56   struct pointer_set_t *dereferenced_ptrs_store;
  57
  58   /* Pointers that have been used in an indirect load operation.  */
  59   struct pointer_set_t *dereferenced_ptrs_load;
  60
  61   /* Memory tag for all the PTR_IS_REF_ALL pointers.  */
  62   tree ref_all_symbol_mem_tag;
  63 };
  64
  65 /* In tree-ssa-alias.c.  */
  66 enum escape_type is_escape_site (tree);
  67 void update_mem_sym_stats_from_stmt (tree, tree, long, long);
  68
  69 /* In tree-ssa-structalias.c.  */
  70 extern void compute_points_to_sets (struct alias_info *);
  71 extern void delete_points_to_sets (void);
  72 extern void dump_constraint (FILE *, constraint_t);
  73 extern void dump_constraints (FILE *);
  74 extern void debug_constraint (constraint_t);
  75 extern void debug_constraints (void);
  76 extern void dump_solution_for_var (FILE *, unsigned int);
  77 extern void debug_solution_for_var (unsigned int);
  78 extern void dump_sa_points_to_info (FILE *);
  79 extern void debug_sa_points_to_info (void);
  80 extern void set_used_smts (void);
  81
  82 #endif /* TREE_SSA_STRUCTALIAS_H  */