mirror of
https://gitlab.gnome.org/GNOME/glib.git
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7bfc60de2e
2008-01-27 Matthias Clasen <mclasen@redhat.com>
* glib/gmacros.h: Deprecate G_GNUC_(PRETTY)_FUNCTION.
svn path=/trunk/; revision=6389
270 lines
9.0 KiB
C
270 lines
9.0 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This 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 of the License, or (at your option) any later version.
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*
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* This 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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/* This file must not include any other glib header file and must thus
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* not refer to variables from glibconfig.h
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*/
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#ifndef __G_MACROS_H__
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#define __G_MACROS_H__
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/* We include stddef.h to get the system's definition of NULL
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*/
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#include <stddef.h>
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/* Here we provide G_GNUC_EXTENSION as an alias for __extension__,
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* where this is valid. This allows for warningless compilation of
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* "long long" types even in the presence of '-ansi -pedantic'.
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*/
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#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)
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# define G_GNUC_EXTENSION __extension__
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#else
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# define G_GNUC_EXTENSION
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#endif
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/* Provide macros to feature the GCC function attribute.
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*/
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#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
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#define G_GNUC_PURE \
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__attribute__((__pure__))
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#define G_GNUC_MALLOC \
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__attribute__((__malloc__))
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#else
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#define G_GNUC_PURE
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#define G_GNUC_MALLOC
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#endif
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#if __GNUC__ >= 4
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#define G_GNUC_NULL_TERMINATED __attribute__((__sentinel__))
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#else
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#define G_GNUC_NULL_TERMINATED
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#endif
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#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
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#define G_GNUC_PRINTF( format_idx, arg_idx ) \
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__attribute__((__format__ (__printf__, format_idx, arg_idx)))
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#define G_GNUC_SCANF( format_idx, arg_idx ) \
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__attribute__((__format__ (__scanf__, format_idx, arg_idx)))
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#define G_GNUC_FORMAT( arg_idx ) \
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__attribute__((__format_arg__ (arg_idx)))
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#define G_GNUC_NORETURN \
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__attribute__((__noreturn__))
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#define G_GNUC_CONST \
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__attribute__((__const__))
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#define G_GNUC_UNUSED \
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__attribute__((__unused__))
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#define G_GNUC_NO_INSTRUMENT \
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__attribute__((__no_instrument_function__))
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#else /* !__GNUC__ */
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#define G_GNUC_PRINTF( format_idx, arg_idx )
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#define G_GNUC_SCANF( format_idx, arg_idx )
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#define G_GNUC_FORMAT( arg_idx )
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#define G_GNUC_NORETURN
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#define G_GNUC_CONST
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#define G_GNUC_UNUSED
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#define G_GNUC_NO_INSTRUMENT
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#endif /* !__GNUC__ */
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#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
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#define G_GNUC_DEPRECATED \
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__attribute__((__deprecated__))
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#else
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#define G_GNUC_DEPRECATED
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#endif /* __GNUC__ */
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#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)
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# define G_GNUC_MAY_ALIAS __attribute__((may_alias))
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#else
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# define G_GNUC_MAY_ALIAS
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#endif
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#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
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#define G_GNUC_WARN_UNUSED_RESULT \
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__attribute__((warn_unused_result))
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#else
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#define G_GNUC_WARN_UNUSED_RESULT
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#endif /* __GNUC__ */
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#ifndef G_DISABLE_DEPRECATED
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/* Wrap the gcc __PRETTY_FUNCTION__ and __FUNCTION__ variables with
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* macros, so we can refer to them as strings unconditionally.
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* usage not-recommended since gcc-3.0
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*/
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#if defined (__GNUC__) && (__GNUC__ < 3)
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#define G_GNUC_FUNCTION __FUNCTION__
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#define G_GNUC_PRETTY_FUNCTION __PRETTY_FUNCTION__
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#else /* !__GNUC__ */
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#define G_GNUC_FUNCTION ""
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#define G_GNUC_PRETTY_FUNCTION ""
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#endif /* !__GNUC__ */
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#endif /* !G_DISABLE_DEPRECATED */
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#define G_STRINGIFY(macro_or_string) G_STRINGIFY_ARG (macro_or_string)
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#define G_STRINGIFY_ARG(contents) #contents
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/* Provide a string identifying the current code position */
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#if defined(__GNUC__) && (__GNUC__ < 3) && !defined(__cplusplus)
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# define G_STRLOC __FILE__ ":" G_STRINGIFY (__LINE__) ":" __PRETTY_FUNCTION__ "()"
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#else
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# define G_STRLOC __FILE__ ":" G_STRINGIFY (__LINE__)
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#endif
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/* Provide a string identifying the current function, non-concatenatable */
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#if defined (__GNUC__)
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# define G_STRFUNC ((const char*) (__PRETTY_FUNCTION__))
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#elif defined (G_HAVE_ISO_VARARGS)
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# define G_STRFUNC ((const char*) (__func__))
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#else
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# define G_STRFUNC ((const char*) ("???"))
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#endif
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/* Guard C code in headers, while including them from C++ */
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#ifdef __cplusplus
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# define G_BEGIN_DECLS extern "C" {
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# define G_END_DECLS }
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#else
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# define G_BEGIN_DECLS
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# define G_END_DECLS
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#endif
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/* Provide definitions for some commonly used macros.
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* Some of them are only provided if they haven't already
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* been defined. It is assumed that if they are already
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* defined then the current definition is correct.
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*/
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#ifndef NULL
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# ifdef __cplusplus
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# define NULL (0L)
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# else /* !__cplusplus */
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# define NULL ((void*) 0)
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# endif /* !__cplusplus */
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#endif
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#ifndef FALSE
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#define FALSE (0)
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#endif
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#ifndef TRUE
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#define TRUE (!FALSE)
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#endif
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#undef MAX
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#define MAX(a, b) (((a) > (b)) ? (a) : (b))
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#undef MIN
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#define MIN(a, b) (((a) < (b)) ? (a) : (b))
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#undef ABS
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#define ABS(a) (((a) < 0) ? -(a) : (a))
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#undef CLAMP
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#define CLAMP(x, low, high) (((x) > (high)) ? (high) : (((x) < (low)) ? (low) : (x)))
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/* Count the number of elements in an array. The array must be defined
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* as such; using this with a dynamically allocated array will give
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* incorrect results.
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*/
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#define G_N_ELEMENTS(arr) (sizeof (arr) / sizeof ((arr)[0]))
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/* Macros by analogy to GINT_TO_POINTER, GPOINTER_TO_INT
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*/
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#define GPOINTER_TO_SIZE(p) ((gsize) (p))
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#define GSIZE_TO_POINTER(s) ((gpointer) (gsize) (s))
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/* Provide convenience macros for handling structure
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* fields through their offsets.
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*/
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#define G_STRUCT_OFFSET(struct_type, member) \
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((glong) ((guint8*) &((struct_type*) 0)->member))
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#define G_STRUCT_MEMBER_P(struct_p, struct_offset) \
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((gpointer) ((guint8*) (struct_p) + (glong) (struct_offset)))
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#define G_STRUCT_MEMBER(member_type, struct_p, struct_offset) \
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(*(member_type*) G_STRUCT_MEMBER_P ((struct_p), (struct_offset)))
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/* Provide simple macro statement wrappers (adapted from Perl):
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* G_STMT_START { statements; } G_STMT_END;
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* can be used as a single statement, as in
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* if (x) G_STMT_START { ... } G_STMT_END; else ...
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*
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* When GCC is compiling C code in non-ANSI mode, it will use the
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* compiler __extension__ to wrap the statements wihin `({' and '})' braces.
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* When compiling on platforms where configure has defined
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* HAVE_DOWHILE_MACROS, statements will be wrapped with `do' and `while (0)'.
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* For any other platforms (SunOS4 is known to have this issue), wrap the
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* statements with `if (1)' and `else (void) 0'.
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*/
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#if !(defined (G_STMT_START) && defined (G_STMT_END))
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# if defined (__GNUC__) && !defined (__STRICT_ANSI__) && !defined (__cplusplus)
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# define G_STMT_START (void) __extension__ (
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# define G_STMT_END )
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# else /* !(__GNUC__ && !__STRICT_ANSI__ && !__cplusplus) */
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# if defined (HAVE_DOWHILE_MACROS)
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# define G_STMT_START do
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# define G_STMT_END while (0)
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# else /* !HAVE_DOWHILE_MACROS */
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# define G_STMT_START if (1)
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# define G_STMT_END else (void) 0
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# endif /* !HAVE_DOWHILE_MACROS */
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# endif /* !(__GNUC__ && !__STRICT_ANSI__ && !__cplusplus) */
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#endif
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/* Allow the app programmer to select whether or not return values
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* (usually char*) are const or not. Don't try using this feature for
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* functions with C++ linkage.
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*/
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#ifdef G_DISABLE_CONST_RETURNS
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#define G_CONST_RETURN
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#else
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#define G_CONST_RETURN const
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#endif
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/*
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* The G_LIKELY and G_UNLIKELY macros let the programmer give hints to
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* the compiler about the expected result of an expression. Some compilers
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* can use this information for optimizations.
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*
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* The _G_BOOLEAN_EXPR macro is intended to trigger a gcc warning when
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* putting assignments in g_return_if_fail ().
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*/
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#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
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#define _G_BOOLEAN_EXPR(expr) \
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__extension__ ({ \
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int _g_boolean_var_; \
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if (expr) \
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_g_boolean_var_ = 1; \
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else \
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_g_boolean_var_ = 0; \
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_g_boolean_var_; \
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})
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#define G_LIKELY(expr) (__builtin_expect (_G_BOOLEAN_EXPR(expr), 1))
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#define G_UNLIKELY(expr) (__builtin_expect (_G_BOOLEAN_EXPR(expr), 0))
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#else
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#define G_LIKELY(expr) (expr)
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#define G_UNLIKELY(expr) (expr)
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#endif
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#endif /* __G_MACROS_H__ */
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