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/* LTO symbol table merging.
Copyright (C) 2009-2020 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;
}
}
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