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/* gcc-function-attribtues.h -- GCC-specific function attributes
Copyright (C) 2016-2022 Free Software Foundation, Inc.
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
/*
Be aware that some function attributes do not work with function
pointers. See
https://lists.gnu.org/r/bug-gnulib/2011-04/msg00007.html
for details.
*/
#ifndef _GCC_FUNCTION_ATTRIBUTES_H
# define _GCC_FUNCTION_ATTRIBUTES_H
# ifndef __GNUC_PREREQ
# if defined __GNUC__ && defined __GNUC_MINOR__
# define __GNUC_PREREQ(maj, min) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
# else
# define __GNUC_PREREQ(maj, min) 0
# endif
# endif
/*
The following attributes are currently (GCC-4.4.5) defined for
functions on all targets. Where this file provides a macro
for using it, the macro name is given in the second column.
Attribute Macro (if implemented in this file)
-------------------------------------------------------------------------------
alias
aligned
alloc_size _GL_ATTRIBUTE_ALLOC_SIZE(arg_num)
always_inline
artificial
cold
const
constructor
deprecated _GL_ATTRIBUTE_DEPRECATED
destructor
error
externally_visible
flatten
format _GL_ATTRIBUTE_FORMAT(spec)
_GL_ATTRIBUTE_FORMAT_PRINTF_SYSTEM(fmt,firstarg)
_GL_ATTRIBUTE_FORMAT_PRINTF_STANDARD(fmt,firstarg)
_GL_ATTRIBUTE_FORMAT_SCANF_SYSTEM(fmt,firstarg)
_GL_ATTRIBUTE_FORMAT_SCANF(fmt,firstarg)
format_arg
gnu_inline
hot
malloc _GL_ATTRIBUTE_MALLOC
no_instrument_function
noinline
nonnull _GL_ATTRIBUTE_NONNULL(args)
_GL_ARG_NONNULL(args)
noreturn _GL_ATTRIBUTE_NORETURN
nothrow
pure _GL_ATTRIBUTE_PURE
returns_twice
section
sentinel _GL_ATTRIBUTE_SENTINEL
unused
used
warn_unused_result _GL_ATTRIBUTE_WUR
warning
weak
*/
/*
Attributes used in gnulib, but which appear to be platform-specific
regparm
stdcall
*/
/*
Attributes used in gnulib with special arguments
Macro Args
visibility "default"
*/
/*
The __attribute__ feature is available in gcc versions 2.5 and later.
The underscored __format__ spelling of the attribute names requires 2.6.4 (we check for 2.7).
*/
# ifndef _GL_ATTRIBUTE_ALLOC_SIZE
# if __GNUC_PREREQ(4,3)
# define _GL_ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
# else
# define _GL_ATTRIBUTE_ALLOC_SIZE(args) /* unsupported */
# endif
# endif
# ifndef _GL_ATTRIBUTE_DEPRECATED
# if __GNUC_PREREQ(3,1)
# define _GL_ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__))
# else
# define _GL_ATTRIBUTE_DEPRECATED /* empty */
# endif
# endif
# ifndef _GL_ATTRIBUTE_FORMAT
# if __GNUC_PREREQ(2,7)
# define _GL_ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
# else
# define _GL_ATTRIBUTE_FORMAT(spec) /* unsupported */
# endif
# endif
# ifndef _GL_ATTRIBUTE_FORMAT_PRINTF_SYSTEM
# if __GNUC_PREREQ(2,7)
# define _GL_ATTRIBUTE_FORMAT_PRINTF_SYSTEM(formatstring_parameter, first_argument) \
_GL_ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
# else
# define _GL_ATTRIBUTE_FORMAT_PRINTF_SYSTEM(spec) /* unsupported */
# endif
# endif
# ifndef _GL_ATTRIBUTE_FORMAT_PRINTF_STANDARD
# if __GNUC_PREREQ(2,7)
# if __GNUC_PREREQ(4,4)
# define _GL_ATTRIBUTE_FORMAT_PRINTF_STANDARD(formatstring_parameter, first_argument) \
_GL_ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
# else
# define _GL_ATTRIBUTE_FORMAT_PRINTF_STANDARD(formatstring_parameter, first_argument) \
_GL_ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
# endif
# else
# define _GL_ATTRIBUTE_FORMAT_PRINTF_STANDARD(spec) /* unsupported */
# endif
# endif
# ifndef _GL_ATTRIBUTE_FORMAT_SCANF_SYSTEM
# if __GNUC_PREREQ(2,7)
# define _GL_ATTRIBUTE_FORMAT_SCANF_SYSTEM(formatstring_parameter, first_argument) \
_GL_ATTRIBUTE_FORMAT ((__scanf__, formatstring_parameter, first_argument))
# else
# define _GL_ATTRIBUTE_FORMAT_SCANF_SYSTEM(spec) /* unsupported */
# endif
# endif
# ifndef _GL_ATTRIBUTE_FORMAT_SCANF
# if __GNUC_PREREQ(2,7)
# if __GNUC_PREREQ(4,4)
# define _GL_ATTRIBUTE_FORMAT_SCANF(formatstring_parameter, first_argument) \
_GL_ATTRIBUTE_FORMAT ((__gnu_scanf__, formatstring_parameter, first_argument))
# else
# define _GL_ATTRIBUTE_FORMAT_SCANF(formatstring_parameter, first_argument) \
_GL_ATTRIBUTE_FORMAT ((__scanf__, formatstring_parameter, first_argument))
# endif
# else
# define _GL_ATTRIBUTE_FORMAT_SCANF(spec) /* unsupported */
# endif
# endif
# ifndef _GL_ATTRIBUTE_MALLOC
# if __GNUC_PREREQ(3,0)
# define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
# else
# define _GL_ATTRIBUTE_MALLOC /* unsupported */
# endif
# endif
# ifndef _GL_ATTRIBUTE_NONNULL
# if __GNUC_PREREQ(3,3)
# define _GL_ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m)))
# else
# define _GL_ATTRIBUTE_NONNULL(m) /* unsupported */
# endif
# endif
# ifndef _GL_ARG_NONNULL
/* alternative spelling used in gnulib's stdio.h */
# define _GL_ARG_NONNULL(m) _GL_ATTRIBUTE_NONNULL(m)
# endif
# ifndef _GL_ATTRIBUTE_NORETURN
# if __GNUC_PREREQ(2,8)
# define _GL_ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
# else
# define _GL_ATTRIBUTE_NORETURN /* unsupported */
# endif
# endif
# ifndef _GL_ATTRIBUTE_PURE
# if __GNUC_PREREQ(2,96)
# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
# else
# define _GL_ATTRIBUTE_PURE /* unsupported */
# endif
# endif
# ifndef _GL_ATTRIBUTE_SENTINEL
# if __GNUC_PREREQ(4,0)
/* gnulib uses the __attribute__((__sentinel__)) variant, for which the
argument number 0 is assumed. Arguments are counted backwards, the last
being 0.
*/
# define _GL_ATTRIBUTE_SENTINEL(backward_arg_num) __attribute__ ((__sentinel__(backward_arg_num)))
# else
# define _GL_ATTRIBUTE_SENTINEL(backward_arg_num) /* unsupported */
# endif
# endif
# ifndef _GL_ATTRIBUTE_WUR
# if __GNUC_PREREQ(3,4)
# define _GL_ATTRIBUTE_WUR __attribute__ ((__warn__unused_result__))
# else
# define _GL_ATTRIBUTE_WUR /* unsupported */
# endif
# endif
# ifndef _GL_ATTRIBUTE_RETURN_CHECK
/* gnulib is inconsistent in which macro it uses; support both for now. */
# define _GL_ATTRIBUTE_RETURN_CHECK _GL_ATTRIBUTE_WUR
# endif
#endif /* _GCC_FUNCTION_ATTRIBUTES_H */
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