1 /* Tree based alias analysis and alias oracle.
2 Copyright (C) 2008 Free Software Foundation, Inc.
3 Contributed by Richard Guenther <rguenther@suse.de>
5 This file is part of GCC.
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.
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.
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/>. */
21 #ifndef TREE_SSA_ALIAS_H
22 #define TREE_SSA_ALIAS_H
24 #include "coretypes.h"
27 /* The points-to solution.
29 The points-to solution is a union of pt_vars and the abstract
30 sets specified by the flags. */
31 struct GTY(()) pt_solution
33 /* Nonzero if points-to analysis couldn't determine where this pointer
35 unsigned int anything
: 1;
37 /* Nonzero if the points-to set includes any global memory. Note that
38 even if this is zero pt_vars can still include global variables. */
39 unsigned int nonlocal
: 1;
41 /* Nonzero if the points-to set includes any escaped local variable. */
42 unsigned int escaped
: 1;
44 /* Nonzero if the points-to set includes 'nothing', the points-to set
45 includes memory at address NULL. */
46 unsigned int null
: 1;
49 /* Nonzero if the pt_vars bitmap includes a global variable. */
50 unsigned int vars_contains_global
: 1;
52 /* Set of variables that this pointer may point to. */
57 /* Simplified and cached information about a memory reference tree.
58 Used by the alias-oracle internally and externally in alternate
60 typedef struct ao_ref_s
62 /* The original full memory reference tree or NULL_TREE if that is
66 /* The following fields are the decomposed reference as returned
67 by get_ref_base_and_extent. */
68 /* The base object of the memory reference or NULL_TREE if all of
69 the following fields are not yet computed. */
71 /* The offset relative to the base. */
73 /* The size of the access. */
75 /* The maximum possible extent of the access or -1 if unconstrained. */
76 HOST_WIDE_INT max_size
;
78 /* The alias set of the access or -1 if not yet computed. */
79 alias_set_type ref_alias_set
;
81 /* The alias set of the base object or -1 if not yet computed. */
82 alias_set_type base_alias_set
;
86 /* In tree-ssa-alias.c */
87 extern void ao_ref_init (ao_ref
*, tree
);
88 extern tree
ao_ref_base (ao_ref
*);
89 extern alias_set_type
ao_ref_alias_set (ao_ref
*);
90 extern bool ptr_deref_may_alias_global_p (tree
);
91 extern bool refs_may_alias_p (tree
, tree
);
92 extern bool refs_anti_dependent_p (tree
, tree
);
93 extern bool refs_output_dependent_p (tree
, tree
);
94 extern bool ref_maybe_used_by_stmt_p (gimple
, tree
);
95 extern bool stmt_may_clobber_ref_p (gimple
, tree
);
96 extern bool stmt_may_clobber_ref_p_1 (gimple
, ao_ref
*);
97 extern void *walk_non_aliased_vuses (ao_ref
*, tree
,
98 void *(*)(ao_ref
*, tree
, void *),
99 void *(*)(ao_ref
*, tree
, void *), void *);
100 extern unsigned int walk_aliased_vdefs (tree
, tree
,
101 bool (*)(tree
, tree
, void *), void *,
103 extern struct ptr_info_def
*get_ptr_info (tree
);
104 extern void dump_alias_info (FILE *);
105 extern void debug_alias_info (void);
106 extern void dump_points_to_solution (FILE *, struct pt_solution
*);
107 extern void dump_points_to_info_for (FILE *, tree
);
108 extern void debug_points_to_info_for (tree
);
109 extern void dump_alias_stats (FILE *);
112 /* In tree-ssa-structalias.c */
113 extern unsigned int compute_may_aliases (void);
114 extern void delete_alias_heapvars (void);
115 extern bool pt_solution_includes_global (struct pt_solution
*);
116 extern bool pt_solution_includes (struct pt_solution
*, const_tree
);
117 extern bool pt_solutions_intersect (struct pt_solution
*, struct pt_solution
*);
118 extern void pt_solution_reset (struct pt_solution
*);
119 extern void dump_pta_stats (FILE *);
122 #endif /* TREE_SSA_ALIAS_H */