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libdfp-symbols.h

/* Support macros for making weak and strong aliases for symbols.

   Copyright (C) 1995-1998, 2000-2006, 2008, 2009
   Free Software Foundation, Inc.

   This file is part of the Decimal Floating Point C Library.

   Author(s): Ryan S. Arnold <rsa@us.ibm.com>

   The Decimal Floating Point C Library is free software; you can
   redistribute it and/or modify it under the terms of the GNU Lesser
   General Public License version 2.1.

   The Decimal Floating Point C Library 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 Lesser General Public License version 2.1 for more details.

   You should have received a copy of the GNU Lesser General Public
   License version 2.1 along with the Decimal Floating Point C Library;
   if not, write to the Free Software Foundation, Inc., 59 Temple Place,
   Suite 330, Boston, MA 02111-1307 USA.

   Please see dfp/COPYING.txt for more information.  */

#ifndef _LIBDFP_SYMBOLS_H
#define _LIBDFP_SYMBOLS_H     1

/* Adapted for libdfp from glibc's include/libc-symbols.h in 2009.  */

#ifndef __SYMBOL_PREFIX
# ifdef NO_UNDERSCORES
#  define __SYMBOL_PREFIX
# else
#  define __SYMBOL_PREFIX "_"
# endif
#endif



#ifndef C_SYMBOL_NAME
# ifdef NO_UNDERSCORES
#  define C_SYMBOL_NAME(name) name
# else
#  define C_SYMBOL_NAME(name) _##name
# endif
#endif

#ifndef ASM_LINE_SEP
# define ASM_LINE_SEP ;
#endif



#define     MIN(a,b) (((a)<(b))?(a):(b))

/* Define ALIASNAME as a strong alias for NAME.  */
#define strong_alias(name, aliasname) _strong_alias(name, aliasname)
#define _strong_alias(name, aliasname) \
  extern __typeof (name) aliasname __attribute__ ((alias (#name)));

/* Define ALIASNAME as a weak alias for NAME.
   If weak aliases are not available, this defines a strong alias.  */
#define weak_alias(name, aliasname) _weak_alias (name, aliasname)
#define _weak_alias(name, aliasname) \
  extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));

/* Same as WEAK_ALIAS, but mark symbol as hidden.  */
#define weak_hidden_alias(name, aliasname) \
  _weak_hidden_alias (name, aliasname)
#define _weak_hidden_alias(name, aliasname) \
  extern __typeof (name) aliasname \
    __attribute__ ((weak, alias (#name), __visibility__ ("hidden")));

/* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined).  */
#define weak_extern(symbol) _weak_extern (weak symbol)
#define _weak_extern(expr) _Pragma (#expr)

/* We don't need hidden visibility with the static library libdfp.a  */
#ifdef SHARED
# define attribute_hidden __attribute__ ((visibility ("hidden")))
#else
# define attribute_hidden
#endif /* SHARED  */

/* Add versioned symbol macros when necessary.  */

/* Macros to avoid PLT calls within libdfp.  */
#ifdef SHARED
#  define __hidden_proto_hiddenattr(attrs...) \
  __attribute__ ((visibility ("hidden"), ##attrs))
#  define hidden_proto(name, attrs...) \
  __hidden_proto (name, __GI_##name, ##attrs)
#  define __hidden_proto(name, internal, attrs...) \
  extern __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
  __hidden_proto_hiddenattr (attrs);
#  define __hidden_asmname(name) \
  __hidden_asmname1 (__USER_LABEL_PREFIX__, name)
#  define __hidden_asmname1(prefix, name) __hidden_asmname2(prefix, name)
#  define __hidden_asmname2(prefix, name) #prefix name
#  define __hidden_ver1(local, internal, name) \
  extern __typeof (name) __EI_##name __asm__(__hidden_asmname (#internal)); \
  extern __typeof (name) __EI_##name \
        __attribute__((alias (__hidden_asmname (#local))))
#  define hidden_ver(local, name)       __hidden_ver1(local, __GI_##name, name);
#  define hidden_data_ver(local, name)  hidden_ver(local, name)
#  define hidden_def(name)              __hidden_ver1(__GI_##name, name, name);
#  define hidden_data_def(name)         hidden_def(name)
#  define hidden_weak(name) \
        __hidden_ver1(__GI_##name, name, name) __attribute__((weak));
#  define hidden_data_weak(name)        hidden_weak(name)
#else
# define hidden_proto(name, attrs...)
# define hidden_weak(name)
# define hidden_def(name)
# define hidden_ver(local, name)
# define hidden_data_weak(name)
# define hidden_data_def(name)
# define hidden_data_ver(local, name)
#endif /* SHARED */

/* C++ needs to know that types and declarations are C, not C++.  */
#ifdef      __cplusplus
# define __BEGIN_DECLS  extern "C" {
# define __END_DECL     }
#else
# define __BEGIN_DECLS
# define __END_DECLS
#endif


#endif /* _LIBDFP_SYMBOLS_H  */

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