1 /* Exported functions from alias.c
2 Copyright (C) 2004-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
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
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
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/>. */
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
29 typedef int alias_set_type
;
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
);
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)
53 #endif /* GCC_ALIAS_H */