gcc/tree-ssa-structalias.h

   1 /* Tree based points-to analysis
   2    Copyright (C) 2002, 2003 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 2 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; if not, write to the Free Software
  19 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  20 */
  21
  22 #ifndef TREE_SSA_STRUCTALIAS_H
  23 #define TREE_SSA_STRUCTALIAS_H
  24
  25 /* True if the data pointed to by PTR can alias anything.  */
  26 #define PTR_IS_REF_ALL(PTR) TYPE_REF_CAN_ALIAS_ALL (TREE_TYPE (PTR))
  27
  28 struct constraint;
  29 typedef struct constraint *constraint_t;
  30
  31 /* Alias information used by compute_may_aliases and its helpers.  */
  32 struct alias_info
  33 {
  34   /* SSA names visited while collecting points-to information.  If bit I
  35      is set, it means that SSA variable with version I has already been
  36      visited.  */
  37   sbitmap ssa_names_visited;
  38
  39   /* Array of SSA_NAME pointers processed by the points-to collector.  */
  40   VEC(tree,heap) *processed_ptrs;
  41
  42   /* ADDRESSABLE_VARS contains all the global variables and locals that
  43      have had their address taken.  */
  44   struct alias_map_d **addressable_vars;
  45   size_t num_addressable_vars;
  46
  47   /* POINTERS contains all the _DECL pointers with unique memory tags
  48      that have been referenced in the program.  */
  49   struct alias_map_d **pointers;
  50   size_t num_pointers;
  51
  52   /* Variables that have been written to directly (i.e., not through a
  53      pointer dereference).  */
  54   struct pointer_set_t *written_vars;
  55
  56   /* Pointers that have been used in an indirect store operation.  */
  57   struct pointer_set_t *dereferenced_ptrs_store;
  58
  59   /* Pointers that have been used in an indirect load operation.  */
  60   struct pointer_set_t *dereferenced_ptrs_load;
  61
  62   /* Memory tag for all the PTR_IS_REF_ALL pointers.  */
  63   tree ref_all_symbol_mem_tag;
  64 };
  65
  66 /* In tree-ssa-alias.c.  */
  67 enum escape_type is_escape_site (tree);
  68 void update_mem_sym_stats_from_stmt (tree, tree, long, long);
  69
  70 /* In tree-ssa-structalias.c.  */
  71 extern void compute_points_to_sets (struct alias_info *);
  72 extern void delete_points_to_sets (void);
  73 extern void dump_constraint (FILE *, constraint_t);
  74 extern void dump_constraints (FILE *);
  75 extern void debug_constraint (constraint_t);
  76 extern void debug_constraints (void);
  77 extern void dump_solution_for_var (FILE *, unsigned int);
  78 extern void debug_solution_for_var (unsigned int);
  79 extern void dump_sa_points_to_info (FILE *);
  80 extern void debug_sa_points_to_info (void);
  81 extern void set_used_smts (void);
  82
  83 #endif /* TREE_SSA_STRUCTALIAS_H  */