| /* Tree based alias analysis and alias oracle. |
| Copyright (C) 2008-2014 Free Software Foundation, Inc. |
| Contributed by Richard Guenther <rguenther@suse.de> |
| |
| 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_ALIAS_H |
| #define TREE_SSA_ALIAS_H |
| |
| /* The points-to solution. |
| |
| The points-to solution is a union of pt_vars and the abstract |
| sets specified by the flags. */ |
| struct GTY(()) pt_solution |
| { |
| /* Nonzero if points-to analysis couldn't determine where this pointer |
| is pointing to. */ |
| unsigned int anything : 1; |
| |
| /* Nonzero if the points-to set includes any global memory. Note that |
| even if this is zero pt_vars can still include global variables. */ |
| unsigned int nonlocal : 1; |
| |
| /* Nonzero if the points-to set includes the local escaped solution by |
| reference. */ |
| unsigned int escaped : 1; |
| |
| /* Nonzero if the points-to set includes the IPA escaped solution by |
| reference. */ |
| unsigned int ipa_escaped : 1; |
| |
| /* Nonzero if the points-to set includes 'nothing', the points-to set |
| includes memory at address NULL. */ |
| unsigned int null : 1; |
| |
| |
| /* Nonzero if the vars bitmap includes a variable included in 'nonlocal'. */ |
| unsigned int vars_contains_nonlocal : 1; |
| /* Nonzero if the vars bitmap includes a variable included in 'escaped'. */ |
| unsigned int vars_contains_escaped : 1; |
| /* Nonzero if the vars bitmap includes a anonymous heap variable that |
| escaped the function and thus became global. */ |
| unsigned int vars_contains_escaped_heap : 1; |
| |
| /* Set of variables that this pointer may point to. */ |
| bitmap vars; |
| }; |
| |
| |
| /* Simplified and cached information about a memory reference tree. |
| Used by the alias-oracle internally and externally in alternate |
| interfaces. */ |
| struct ao_ref |
| { |
| /* The original full memory reference tree or NULL_TREE if that is |
| not available. */ |
| tree ref; |
| |
| /* The following fields are the decomposed reference as returned |
| by get_ref_base_and_extent. */ |
| /* The base object of the memory reference or NULL_TREE if all of |
| the following fields are not yet computed. */ |
| tree base; |
| /* The offset relative to the base. */ |
| HOST_WIDE_INT offset; |
| /* The size of the access. */ |
| HOST_WIDE_INT size; |
| /* The maximum possible extent of the access or -1 if unconstrained. */ |
| HOST_WIDE_INT max_size; |
| |
| /* The alias set of the access or -1 if not yet computed. */ |
| alias_set_type ref_alias_set; |
| |
| /* The alias set of the base object or -1 if not yet computed. */ |
| alias_set_type base_alias_set; |
| |
| /* Whether the memory is considered a volatile access. */ |
| bool volatile_p; |
| }; |
| |
| |
| /* In tree-ssa-alias.c */ |
| extern void ao_ref_init (ao_ref *, tree); |
| extern void ao_ref_init_from_ptr_and_size (ao_ref *, tree, tree); |
| extern tree ao_ref_base (ao_ref *); |
| extern alias_set_type ao_ref_alias_set (ao_ref *); |
| extern bool ptr_deref_may_alias_global_p (tree); |
| extern bool ptr_derefs_may_alias_p (tree, tree); |
| extern bool ref_may_alias_global_p (tree); |
| extern bool refs_may_alias_p (tree, tree); |
| extern bool refs_may_alias_p_1 (ao_ref *, ao_ref *, bool); |
| extern bool refs_anti_dependent_p (tree, tree); |
| extern bool refs_output_dependent_p (tree, tree); |
| extern bool ref_maybe_used_by_stmt_p (gimple, tree); |
| extern bool stmt_may_clobber_global_p (gimple); |
| extern bool stmt_may_clobber_ref_p (gimple, tree); |
| extern bool stmt_may_clobber_ref_p_1 (gimple, ao_ref *); |
| extern bool call_may_clobber_ref_p (gimple, tree); |
| extern bool stmt_kills_ref_p (gimple, tree); |
| extern tree get_continuation_for_phi (gimple, ao_ref *, |
| unsigned int *, bitmap *, bool); |
| extern void *walk_non_aliased_vuses (ao_ref *, tree, |
| void *(*)(ao_ref *, tree, |
| unsigned int, void *), |
| void *(*)(ao_ref *, tree, void *), void *); |
| extern unsigned int walk_aliased_vdefs (ao_ref *, tree, |
| bool (*)(ao_ref *, tree, void *), |
| void *, bitmap *); |
| extern void dump_alias_info (FILE *); |
| extern void debug_alias_info (void); |
| extern void dump_points_to_solution (FILE *, struct pt_solution *); |
| extern void debug (pt_solution &ref); |
| extern void debug (pt_solution *ptr); |
| extern void dump_points_to_info_for (FILE *, tree); |
| extern void debug_points_to_info_for (tree); |
| extern void dump_alias_stats (FILE *); |
| |
| |
| /* In tree-ssa-structalias.c */ |
| extern unsigned int compute_may_aliases (void); |
| extern bool pt_solution_empty_p (struct pt_solution *); |
| extern bool pt_solution_singleton_p (struct pt_solution *, unsigned *); |
| extern bool pt_solution_includes_global (struct pt_solution *); |
| extern bool pt_solution_includes (struct pt_solution *, const_tree); |
| extern bool pt_solutions_intersect (struct pt_solution *, struct pt_solution *); |
| extern void pt_solution_reset (struct pt_solution *); |
| extern void pt_solution_set (struct pt_solution *, bitmap, bool); |
| extern void pt_solution_set_var (struct pt_solution *, tree); |
| |
| extern void dump_pta_stats (FILE *); |
| |
| extern GTY(()) struct pt_solution ipa_escaped_pt; |
| |
| /* Return true, if the two ranges [POS1, SIZE1] and [POS2, SIZE2] |
| overlap. SIZE1 and/or SIZE2 can be (unsigned)-1 in which case the |
| range is open-ended. Otherwise return false. */ |
| |
| static inline bool |
| ranges_overlap_p (HOST_WIDE_INT pos1, |
| unsigned HOST_WIDE_INT size1, |
| HOST_WIDE_INT pos2, |
| unsigned HOST_WIDE_INT size2) |
| { |
| if (pos1 >= pos2 |
| && (size2 == (unsigned HOST_WIDE_INT)-1 |
| || pos1 < (pos2 + (HOST_WIDE_INT) size2))) |
| return true; |
| if (pos2 >= pos1 |
| && (size1 == (unsigned HOST_WIDE_INT)-1 |
| || pos2 < (pos1 + (HOST_WIDE_INT) size1))) |
| return true; |
| |
| return false; |
| } |
| |
| |
| |
| #endif /* TREE_SSA_ALIAS_H */ |
