gcc/alias.h

   1 /* Exported functions from alias.c
   2    Copyright (C) 2004-2015 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_ALIAS_H
  21 #define GCC_ALIAS_H
  22
  23 /* The type of an alias set.  Code currently assumes that variables of
  24    this type can take the values 0 (the alias set which aliases
  25    everything) and -1 (sometimes indicating that the alias set is
  26    unknown, sometimes indicating a memory barrier) and -2 (indicating
  27    that the alias set should be set to a unique value but has not been
  28    set yet).  */
  29 typedef int alias_set_type;
  30
  31 extern alias_set_type new_alias_set (void);
  32 extern alias_set_type get_alias_set (tree);
  33 extern alias_set_type get_deref_alias_set (tree);
  34 extern alias_set_type get_varargs_alias_set (void);
  35 extern alias_set_type get_frame_alias_set (void);
  36 extern tree component_uses_parent_alias_set_from (const_tree);
  37 extern bool alias_set_subset_of (alias_set_type, alias_set_type);
  38 extern void record_alias_subset (alias_set_type, alias_set_type);
  39 extern void record_component_aliases (tree);
  40 extern int alias_sets_conflict_p (alias_set_type, alias_set_type);
  41 extern int alias_sets_must_conflict_p (alias_set_type, alias_set_type);
  42 extern int objects_must_conflict_p (tree, tree);
  43 extern int nonoverlapping_memrefs_p (const_rtx, const_rtx, bool);
  44 tree reference_alias_ptr_type (tree);
  45 bool alias_ptr_types_compatible_p (tree, tree);
  46
  47 /* This alias set can be used to force a memory to conflict with all
  48    other memories, creating a barrier across which no memory reference
  49    can move.  Note that there are other legacy ways to create such
  50    memory barriers, including an address of SCRATCH.  */
  51 #define ALIAS_SET_MEMORY_BARRIER        ((alias_set_type) -1)
  52
  53 #endif /* GCC_ALIAS_H */