1 /* Exported functions from alias.c 2 Copyright (C) 2004, 2007, 2008, 2009 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 #include "coretypes.h" 24 25 /* The type of an alias set. Code currently assumes that variables of 26 this type can take the values 0 (the alias set which aliases 27 everything) and -1 (sometimes indicating that the alias set is 28 unknown, sometimes indicating a memory barrier) and -2 (indicating 29 that the alias set should be set to a unique value but has not been 30 set yet). */ 31 typedef int alias_set_type; 32 33 extern alias_set_type new_alias_set (void); 34 extern alias_set_type get_alias_set (tree); 35 extern alias_set_type get_varargs_alias_set (void); 36 extern alias_set_type get_frame_alias_set (void); 37 extern bool component_uses_parent_alias_set (const_tree); 38 extern bool alias_set_subset_of (alias_set_type, alias_set_type); 39 extern void record_alias_subset (alias_set_type, alias_set_type); 40 extern void record_component_aliases (tree); 41 extern int alias_sets_conflict_p (alias_set_type, alias_set_type); 42 extern int alias_sets_must_conflict_p (alias_set_type, alias_set_type); 43 extern int objects_must_conflict_p (tree, tree); 44 extern int nonoverlapping_memrefs_p (const_rtx, const_rtx); 45 extern bool insn_alias_sets_conflict_p (rtx, rtx); 46 extern void record_alias_subset (alias_set_type, alias_set_type); 47 48 /* This alias set can be used to force a memory to conflict with all 49 other memories, creating a barrier across which no memory reference 50 can move. Note that there are other legacy ways to create such 51 memory barriers, including an address of SCRATCH. */ 52 #define ALIAS_SET_MEMORY_BARRIER ((alias_set_type) -1) 53 54 #endif /* GCC_ALIAS_H */ 55
