212 lines
7.7 KiB
C++
212 lines
7.7 KiB
C++
/* Tree based alias analysis and alias oracle.
|
|
Copyright (C) 2008-2023 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;
|
|
/* Nonzero if the vars bitmap includes a anonymous variable used to
|
|
represent storage pointed to by a restrict qualified pointer. */
|
|
unsigned int vars_contains_restrict : 1;
|
|
/* Nonzero if the vars bitmap includes an interposable variable. */
|
|
unsigned int vars_contains_interposable : 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. */
|
|
class ao_ref
|
|
{
|
|
public:
|
|
/* 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. */
|
|
poly_int64 offset;
|
|
/* The size of the access. */
|
|
poly_int64 size;
|
|
/* The maximum possible extent of the access or -1 if unconstrained. */
|
|
poly_int64 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;
|
|
|
|
bool max_size_known_p () const;
|
|
};
|
|
|
|
/* Return true if the maximum size is known, rather than the special -1
|
|
marker. */
|
|
|
|
inline bool
|
|
ao_ref::max_size_known_p () const
|
|
{
|
|
return known_size_p (max_size);
|
|
}
|
|
|
|
/* In tree-ssa-alias.cc */
|
|
extern void ao_ref_init (ao_ref *, tree);
|
|
extern void ao_ref_init_from_ptr_and_size (ao_ref *, tree, tree);
|
|
extern void ao_ref_init_from_ptr_and_range (ao_ref *, tree, bool,
|
|
poly_int64, poly_int64,
|
|
poly_int64);
|
|
extern tree ao_ref_base (ao_ref *);
|
|
extern alias_set_type ao_ref_alias_set (ao_ref *);
|
|
extern alias_set_type ao_ref_base_alias_set (ao_ref *);
|
|
extern tree ao_ref_alias_ptr_type (ao_ref *);
|
|
extern tree ao_ref_base_alias_ptr_type (ao_ref *);
|
|
extern bool ao_ref_alignment (ao_ref *, unsigned int *,
|
|
unsigned HOST_WIDE_INT *);
|
|
extern bool ptr_deref_may_alias_global_p (tree, bool);
|
|
extern bool ptr_derefs_may_alias_p (tree, tree);
|
|
extern bool ptrs_compare_unequal (tree, tree);
|
|
extern bool ref_may_alias_global_p (tree, bool);
|
|
extern bool ref_may_alias_global_p (ao_ref *, bool);
|
|
extern bool refs_may_alias_p (tree, tree, bool = true);
|
|
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, bool = true);
|
|
extern bool ref_maybe_used_by_stmt_p (gimple *, ao_ref *, bool = true);
|
|
extern bool stmt_may_clobber_global_p (gimple *, bool);
|
|
extern bool stmt_may_clobber_ref_p (gimple *, tree, bool = true);
|
|
extern bool stmt_may_clobber_ref_p_1 (gimple *, ao_ref *, bool = true);
|
|
extern bool call_may_clobber_ref_p (gcall *, tree, bool = true);
|
|
extern bool call_may_clobber_ref_p_1 (gcall *, ao_ref *, bool = true);
|
|
extern bool stmt_kills_ref_p (gimple *, tree);
|
|
extern bool stmt_kills_ref_p (gimple *, ao_ref *);
|
|
enum translate_flags
|
|
{ TR_TRANSLATE, TR_VALUEIZE_AND_DISAMBIGUATE, TR_DISAMBIGUATE };
|
|
extern tree get_continuation_for_phi (gimple *, ao_ref *, bool,
|
|
unsigned int &, bitmap *, bool,
|
|
void *(*)(ao_ref *, tree, void *,
|
|
translate_flags *),
|
|
void *, translate_flags
|
|
= TR_VALUEIZE_AND_DISAMBIGUATE);
|
|
extern void *walk_non_aliased_vuses (ao_ref *, tree, bool,
|
|
void *(*)(ao_ref *, tree, void *),
|
|
void *(*)(ao_ref *, tree, void *,
|
|
translate_flags *),
|
|
tree (*)(tree), unsigned &, void *);
|
|
extern int walk_aliased_vdefs (ao_ref *, tree,
|
|
bool (*)(ao_ref *, tree, void *),
|
|
void *, bitmap *,
|
|
bool *function_entry_reached = NULL,
|
|
unsigned int limit = 0);
|
|
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.cc */
|
|
extern unsigned int compute_may_aliases (void);
|
|
extern bool pt_solution_empty_p (const pt_solution *);
|
|
extern bool pt_solution_singleton_or_null_p (struct pt_solution *, unsigned *);
|
|
extern bool pt_solution_includes_global (struct pt_solution *, bool);
|
|
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. */
|
|
|
|
inline bool
|
|
ranges_overlap_p (HOST_WIDE_INT pos1,
|
|
unsigned HOST_WIDE_INT size1,
|
|
HOST_WIDE_INT pos2,
|
|
unsigned HOST_WIDE_INT size2)
|
|
{
|
|
if (size1 == 0 || size2 == 0)
|
|
return false;
|
|
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 */
|