/* Tree based alias analysis and alias oracle. Copyright (C) 2008-2014 Free Software Foundation, Inc. Contributed by Richard Guenther 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 . */ #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 */