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