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1 /* LTO symbol table merging.
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131
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2 Copyright (C) 2009-2018 Free Software Foundation, Inc.
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111
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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 extern void lto_symtab_merge_decls (void);
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21 extern void lto_symtab_merge_symbols (void);
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22 extern tree lto_symtab_prevailing_decl (tree decl);
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23 extern tree lto_symtab_prevailing_virtual_decl (tree decl);
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24
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25 /* Mark DECL to be previailed by PREVAILING.
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26 Use DECL_LANG_FLAG_0 and DECL_CHAIN as special markers; those do not
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27 disturb debug_tree and diagnostics.
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28 We are safe to modify them as we wish, because the declarations disappear
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29 from the IL after the merging. */
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30
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31 inline void
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32 lto_symtab_prevail_decl (tree prevailing, tree decl)
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33 {
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34 gcc_checking_assert (! DECL_LANG_FLAG_0 (decl));
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35 gcc_assert (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl));
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36 DECL_CHAIN (decl) = prevailing;
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37 DECL_LANG_FLAG_0 (decl) = 1;
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38 }
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39
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40 /* Given the decl DECL, return the prevailing decl with the same name. */
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41
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42 inline tree
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43 lto_symtab_prevailing_decl (tree decl)
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44 {
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45 if (DECL_LANG_FLAG_0 (decl))
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46 return DECL_CHAIN (decl);
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47 else
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48 {
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49 if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
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50 && DECL_VIRTUAL_P (decl)
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51 && (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl))
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52 && !symtab_node::get (decl))
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53 return lto_symtab_prevailing_virtual_decl (decl);
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54 return decl;
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55 }
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56 }
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