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6b9ac179 | 1 | /* LTO symbol table merging. |
7adcbafe | 2 | Copyright (C) 2009-2022 Free Software Foundation, Inc. |
6b9ac179 JH |
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); | |
3fddb2ef | 23 | extern tree lto_symtab_prevailing_virtual_decl (tree decl); |
6b9ac179 JH |
24 | |
25 | /* Mark DECL to be previailed by PREVAILING. | |
63e434ca | 26 | Use DECL_LANG_FLAG_0 and DECL_CHAIN as special markers; those do not |
6b9ac179 | 27 | disturb debug_tree and diagnostics. |
56aae4b7 | 28 | We are safe to modify them as we wish, because the declarations disappear |
6b9ac179 JH |
29 | from the IL after the merging. */ |
30 | ||
31 | inline void | |
32 | lto_symtab_prevail_decl (tree prevailing, tree decl) | |
33 | { | |
63e434ca | 34 | gcc_checking_assert (! DECL_LANG_FLAG_0 (decl)); |
3fddb2ef | 35 | gcc_assert (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl)); |
6b9ac179 | 36 | DECL_CHAIN (decl) = prevailing; |
63e434ca | 37 | DECL_LANG_FLAG_0 (decl) = 1; |
6b9ac179 JH |
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 | { | |
63e434ca | 45 | if (DECL_LANG_FLAG_0 (decl)) |
6b9ac179 JH |
46 | return DECL_CHAIN (decl); |
47 | else | |
3fddb2ef JH |
48 | { |
49 | if ((TREE_CODE (decl) == VAR_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 | } | |
6b9ac179 | 56 | } |