| /* LTO symbol table merging. |
| Copyright (C) 2009-2021 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| extern void lto_symtab_merge_decls (void); |
| extern void lto_symtab_merge_symbols (void); |
| extern tree lto_symtab_prevailing_decl (tree decl); |
| extern tree lto_symtab_prevailing_virtual_decl (tree decl); |
| |
| /* Mark DECL to be previailed by PREVAILING. |
| Use DECL_LANG_FLAG_0 and DECL_CHAIN as special markers; those do not |
| disturb debug_tree and diagnostics. |
| We are safe to modify them as we wish, because the declarations disappear |
| from the IL after the merging. */ |
| |
| inline void |
| lto_symtab_prevail_decl (tree prevailing, tree decl) |
| { |
| gcc_checking_assert (! DECL_LANG_FLAG_0 (decl)); |
| gcc_assert (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl)); |
| DECL_CHAIN (decl) = prevailing; |
| DECL_LANG_FLAG_0 (decl) = 1; |
| } |
| |
| /* Given the decl DECL, return the prevailing decl with the same name. */ |
| |
| inline tree |
| lto_symtab_prevailing_decl (tree decl) |
| { |
| if (DECL_LANG_FLAG_0 (decl)) |
| return DECL_CHAIN (decl); |
| else |
| { |
| if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL) |
| && DECL_VIRTUAL_P (decl) |
| && (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl)) |
| && !symtab_node::get (decl)) |
| return lto_symtab_prevailing_virtual_decl (decl); |
| return decl; |
| } |
| } |