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/* Tree based alias analysis and alias oracle.
Copyright (C) 2008 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
#include "coretypes.h"
/* The reasons a variable may escape a function. */
enum escape_type
{
NO_ESCAPE = 0, /* Doesn't escape. */
ESCAPE_STORED_IN_GLOBAL = 1 << 0,
ESCAPE_TO_ASM = 1 << 1, /* Passed by address to an assembly
statement. */
ESCAPE_TO_CALL = 1 << 2, /* Escapes to a function call. */
ESCAPE_BAD_CAST = 1 << 3, /* Cast from pointer to integer */
ESCAPE_TO_RETURN = 1 << 4, /* Returned from function. */
ESCAPE_TO_PURE_CONST = 1 << 5, /* Escapes to a pure or constant
function call. */
ESCAPE_IS_GLOBAL = 1 << 6, /* Is a global variable. */
ESCAPE_IS_PARM = 1 << 7, /* Is an incoming function argument. */
ESCAPE_UNKNOWN = 1 << 8 /* We believe it escapes for
some reason not enumerated
above. */
};
/* The points-to solution.
The points-to solution is a union of pt_vars and the abstract
sets specified by the flags. */
struct pt_solution GTY(())
{
/* 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 any escaped local variable. */
unsigned int 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 pt_vars bitmap includes a global variable. */
unsigned int vars_contains_global : 1;
/* Set of variables that this pointer may point to. */
bitmap vars;
};
/* In tree-ssa-alias.c */
extern enum escape_type is_escape_site (gimple);
extern bool ptr_deref_may_alias_global_p (tree);
extern bool refs_may_alias_p (tree, tree);
extern bool ref_maybe_used_by_stmt_p (gimple, tree);
extern bool stmt_may_clobber_ref_p (gimple, tree);
extern void *walk_non_aliased_vuses (tree, tree,
void *(*)(tree, tree, void *), void *);
extern unsigned int walk_aliased_vdefs (tree, tree,
bool (*)(tree, tree, void *), void *,
bitmap *);
extern struct ptr_info_def *get_ptr_info (tree);
extern void dump_alias_info (FILE *);
extern void debug_alias_info (void);
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 void delete_alias_heapvars (void);
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 dump_pta_stats (FILE *);
#endif /* TREE_SSA_ALIAS_H */
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