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/* Tree based points-to analysis
Copyright (C) 2002, 2003 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 2 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; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#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, struct alias_info *);
/* 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 */
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