From 1bc5aee63eb72b341f506ad058502cd0361f0d10 Mon Sep 17 00:00:00 2001 From: Ben Cheng Date: Tue, 25 Mar 2014 22:37:19 -0700 Subject: Initial checkin of GCC 4.9.0 from trunk (r208799). Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba --- gcc-4.9/gcc/tree-ssa-alias.h | 172 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 172 insertions(+) create mode 100644 gcc-4.9/gcc/tree-ssa-alias.h (limited to 'gcc-4.9/gcc/tree-ssa-alias.h') diff --git a/gcc-4.9/gcc/tree-ssa-alias.h b/gcc-4.9/gcc/tree-ssa-alias.h new file mode 100644 index 000000000..3544aafca --- /dev/null +++ b/gcc-4.9/gcc/tree-ssa-alias.h @@ -0,0 +1,172 @@ +/* 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 */ -- cgit v1.2.3