89 lines
3.6 KiB
C
89 lines
3.6 KiB
C
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/* Symbol version management.
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Copyright (C) 1995-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* This file is included from <libc-symbols.h> for !_ISOMAC, and
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unconditionally from <shlib-compat.h>. */
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#ifndef _LIBC_SYMVER_H
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#define _LIBC_SYMVER_H 1
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#include <config.h>
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/* Use symbol_version_reference to specify the version a symbol
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reference should link to. Use symbol_version or
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default_symbol_version for the definition of a versioned symbol.
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The difference is that the latter is a no-op in non-shared
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builds.
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_set_symbol_version is similar to symbol_version_reference, except
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that this macro expects the name and symbol version as a single
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string or token sequence, with an @ or @@ separator. (A string is
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used in C mode and a token sequence in assembler mode.)
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_set_symbol_version only be used for definitions because it may
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introduce an alias symbol that would not be globally unique for
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mere references. The _set_symbol_version macro is used to define
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default_symbol_version and compat_symbol. */
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#ifdef __ASSEMBLER__
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# define symbol_version_reference(real, name, version) \
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.symver real, name##@##version
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#else
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# define symbol_version_reference(real, name, version) \
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__asm__ (".symver " #real "," #name "@" #version)
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#endif /* !__ASSEMBLER__ */
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#if SYMVER_NEEDS_ALIAS
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/* If the assembler cannot support multiple versions for the same
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symbol, introduce __SInnn_ aliases to which the symbol version is
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attached. */
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# define __symbol_version_unique_concat(x, y) __SI ## x ## _ ## y
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# define _symbol_version_unique_concat(x, y) \
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__symbol_version_unique_concat (x, y)
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# define _symbol_version_unique_alias(name) \
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_symbol_version_unique_concat (name, __COUNTER__)
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# ifdef __ASSEMBLER__
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# define _set_symbol_version_2(real, alias, name_version) \
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.globl alias ASM_LINE_SEP \
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.equiv alias, real ASM_LINE_SEP \
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.symver alias, name_version
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# else
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# define _set_symbol_version_2(real, alias, name_version) \
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__asm__ (".globl " #alias "\n\t" \
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".equiv " #alias ", " #real "\n\t" \
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".symver " #alias "," name_version)
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# endif
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# define _set_symbol_version_1(real, alias, name_version) \
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_set_symbol_version_2 (real, alias, name_version)
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/* REAL must be globally unique, so that the counter also produces
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globally unique symbols. */
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# define _set_symbol_version(real, name_version) \
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_set_symbol_version_1 (real, _symbol_version_unique_alias (real), \
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name_version)
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# else /* !SYMVER_NEEDS_ALIAS */
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# ifdef __ASSEMBLER__
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# define _set_symbol_version(real, name_version) \
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.symver real, name_version
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# else
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# define _set_symbol_version(real, name_version) \
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__asm__ (".symver " #real "," name_version)
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# endif
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#endif /* !SYMVER_NEEDS_ALIAS */
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#endif /* _LIBC_SYMVER_H */
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