1*e4b17023SJohn Marino /* Exported functions from alias.c 2*e4b17023SJohn Marino Copyright (C) 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. 3*e4b17023SJohn Marino 4*e4b17023SJohn Marino This file is part of GCC. 5*e4b17023SJohn Marino 6*e4b17023SJohn Marino GCC is free software; you can redistribute it and/or modify it under 7*e4b17023SJohn Marino the terms of the GNU General Public License as published by the Free 8*e4b17023SJohn Marino Software Foundation; either version 3, or (at your option) any later 9*e4b17023SJohn Marino version. 10*e4b17023SJohn Marino 11*e4b17023SJohn Marino GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12*e4b17023SJohn Marino WARRANTY; without even the implied warranty of MERCHANTABILITY or 13*e4b17023SJohn Marino FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14*e4b17023SJohn Marino for more details. 15*e4b17023SJohn Marino 16*e4b17023SJohn Marino You should have received a copy of the GNU General Public License 17*e4b17023SJohn Marino along with GCC; see the file COPYING3. If not see 18*e4b17023SJohn Marino <http://www.gnu.org/licenses/>. */ 19*e4b17023SJohn Marino 20*e4b17023SJohn Marino #ifndef GCC_ALIAS_H 21*e4b17023SJohn Marino #define GCC_ALIAS_H 22*e4b17023SJohn Marino 23*e4b17023SJohn Marino #include "coretypes.h" 24*e4b17023SJohn Marino 25*e4b17023SJohn Marino /* The type of an alias set. Code currently assumes that variables of 26*e4b17023SJohn Marino this type can take the values 0 (the alias set which aliases 27*e4b17023SJohn Marino everything) and -1 (sometimes indicating that the alias set is 28*e4b17023SJohn Marino unknown, sometimes indicating a memory barrier) and -2 (indicating 29*e4b17023SJohn Marino that the alias set should be set to a unique value but has not been 30*e4b17023SJohn Marino set yet). */ 31*e4b17023SJohn Marino typedef int alias_set_type; 32*e4b17023SJohn Marino 33*e4b17023SJohn Marino extern alias_set_type new_alias_set (void); 34*e4b17023SJohn Marino extern alias_set_type get_alias_set (tree); 35*e4b17023SJohn Marino extern alias_set_type get_deref_alias_set (tree); 36*e4b17023SJohn Marino extern alias_set_type get_varargs_alias_set (void); 37*e4b17023SJohn Marino extern alias_set_type get_frame_alias_set (void); 38*e4b17023SJohn Marino extern bool component_uses_parent_alias_set (const_tree); 39*e4b17023SJohn Marino extern bool alias_set_subset_of (alias_set_type, alias_set_type); 40*e4b17023SJohn Marino extern void record_alias_subset (alias_set_type, alias_set_type); 41*e4b17023SJohn Marino extern void record_component_aliases (tree); 42*e4b17023SJohn Marino extern int alias_sets_conflict_p (alias_set_type, alias_set_type); 43*e4b17023SJohn Marino extern int alias_sets_must_conflict_p (alias_set_type, alias_set_type); 44*e4b17023SJohn Marino extern int objects_must_conflict_p (tree, tree); 45*e4b17023SJohn Marino extern int nonoverlapping_memrefs_p (const_rtx, const_rtx, bool); 46*e4b17023SJohn Marino 47*e4b17023SJohn Marino /* This alias set can be used to force a memory to conflict with all 48*e4b17023SJohn Marino other memories, creating a barrier across which no memory reference 49*e4b17023SJohn Marino can move. Note that there are other legacy ways to create such 50*e4b17023SJohn Marino memory barriers, including an address of SCRATCH. */ 51*e4b17023SJohn Marino #define ALIAS_SET_MEMORY_BARRIER ((alias_set_type) -1) 52*e4b17023SJohn Marino 53*e4b17023SJohn Marino #endif /* GCC_ALIAS_H */ 54