| 1 | /* LTO symbol table merging. |
|---|---|
| 2 | Copyright (C) 2009-2023 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 | extern void lto_symtab_merge_decls (void); |
| 21 | extern void lto_symtab_merge_symbols (void); |
| 22 | extern tree lto_symtab_prevailing_decl (tree decl); |
| 23 | extern tree lto_symtab_prevailing_virtual_decl (tree decl); |
| 24 | |
| 25 | /* Mark DECL to be previailed by PREVAILING. |
| 26 | Use DECL_LANG_FLAG_0 and DECL_CHAIN as special markers; those do not |
| 27 | disturb debug_tree and diagnostics. |
| 28 | We are safe to modify them as we wish, because the declarations disappear |
| 29 | from the IL after the merging. */ |
| 30 | |
| 31 | inline void |
| 32 | lto_symtab_prevail_decl (tree prevailing, tree decl) |
| 33 | { |
| 34 | gcc_checking_assert (! DECL_LANG_FLAG_0 (decl)); |
| 35 | gcc_assert (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl)); |
| 36 | DECL_CHAIN (decl) = prevailing; |
| 37 | DECL_LANG_FLAG_0 (decl) = 1; |
| 38 | } |
| 39 | |
| 40 | /* Given the decl DECL, return the prevailing decl with the same name. */ |
| 41 | |
| 42 | inline tree |
| 43 | lto_symtab_prevailing_decl (tree decl) |
| 44 | { |
| 45 | if (DECL_LANG_FLAG_0 (decl)) |
| 46 | return DECL_CHAIN (decl); |
| 47 | else |
| 48 | { |
| 49 | if ((VAR_P (decl) || TREE_CODE (decl) == FUNCTION_DECL) |
| 50 | && DECL_VIRTUAL_P (decl) |
| 51 | && (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl)) |
| 52 | && !symtab_node::get (decl)) |
| 53 | return lto_symtab_prevailing_virtual_decl (decl); |
| 54 | return decl; |
| 55 | } |
| 56 | } |
| 57 |