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