1 | /* LTO symbol table merging. |
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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 |