Line data    Source code

       1              : /* LTO symbol table merging.
       2              :    Copyright (C) 2009-2026 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         1713 : lto_symtab_prevail_decl (tree prevailing, tree decl)
      33              : {
      34         1713 :   gcc_checking_assert (! DECL_LANG_FLAG_0 (decl));
      35         1713 :   gcc_assert (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl));
      36         1713 :   DECL_CHAIN (decl) = prevailing;
      37         1713 :   DECL_LANG_FLAG_0 (decl) = 1;
      38         1713 : }
      39              : 
      40              : /* Given the decl DECL, return the prevailing decl with the same name. */
      41              : 
      42              : inline tree
      43       438477 : lto_symtab_prevailing_decl (tree decl)
      44              : {
      45       438477 :   if (DECL_LANG_FLAG_0 (decl))
      46         6064 :     return DECL_CHAIN (decl);
      47              :   else
      48              :     {
      49       368415 :       if ((VAR_P (decl) || TREE_CODE (decl) == FUNCTION_DECL)
      50       432413 :           && DECL_VIRTUAL_P (decl)
      51         7363 :           && (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl))
      52       439776 :           && !symtab_node::get (decl))
      53         1002 :         return lto_symtab_prevailing_virtual_decl (decl);
      54              :       return decl;
      55              :     }
      56              : }