mirror of
https://github.com/brl/mutter.git
synced 2024-12-24 20:12:06 +00:00
d2c41502a4
This commit pushes --disable-glib to the extreme of embedding the par of glib cogl depends on in tree to be able to generate a DSO that does not depend on an external glib. To do so, it: - keeps a lot of glib's configure.ac in as-glibconfig.m4 - pulls the code cogl depends on and the necessary dependencies Reviewed-by: Robert Bragg <robert@linux.intel.com>
111 lines
4.3 KiB
C
111 lines
4.3 KiB
C
/* GLIB - Library of useful routines for C programming
|
|
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This 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 for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
/*
|
|
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
|
|
* file for a list of people on the GLib Team. See the ChangeLog
|
|
* files for a list of changes. These files are distributed with
|
|
* GLib at ftp://ftp.gtk.org/pub/gtk/.
|
|
*/
|
|
|
|
#if defined(G_DISABLE_SINGLE_INCLUDES) && !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
|
|
#error "Only <glib.h> can be included directly."
|
|
#endif
|
|
|
|
#ifndef __G_ALLOCA_H__
|
|
#define __G_ALLOCA_H__
|
|
|
|
#include <glib/gtypes.h>
|
|
|
|
#ifdef __GNUC__
|
|
/* GCC does the right thing */
|
|
# undef alloca
|
|
# define alloca(size) __builtin_alloca (size)
|
|
#elif defined (GLIB_HAVE_ALLOCA_H)
|
|
/* a native and working alloca.h is there */
|
|
# include <alloca.h>
|
|
#else /* !__GNUC__ && !GLIB_HAVE_ALLOCA_H */
|
|
# if defined(_MSC_VER) || defined(__DMC__)
|
|
# include <malloc.h>
|
|
# define alloca _alloca
|
|
# else /* !_MSC_VER && !__DMC__ */
|
|
# ifdef _AIX
|
|
# pragma alloca
|
|
# else /* !_AIX */
|
|
# ifndef alloca /* predefined by HP cc +Olibcalls */
|
|
G_BEGIN_DECLS
|
|
char *alloca ();
|
|
G_END_DECLS
|
|
# endif /* !alloca */
|
|
# endif /* !_AIX */
|
|
# endif /* !_MSC_VER && !__DMC__ */
|
|
#endif /* !__GNUC__ && !GLIB_HAVE_ALLOCA_H */
|
|
|
|
/**
|
|
* g_alloca:
|
|
* @size: number of bytes to allocate.
|
|
*
|
|
* Allocates @size bytes on the stack; these bytes will be freed when the current
|
|
* stack frame is cleaned up. This macro essentially just wraps the alloca()
|
|
* function present on most UNIX variants.
|
|
* Thus it provides the same advantages and pitfalls as alloca():
|
|
* <variablelist>
|
|
* <varlistentry><term></term><listitem><para>
|
|
* + alloca() is very fast, as on most systems it's implemented by just adjusting
|
|
* the stack pointer register.
|
|
* </para></listitem></varlistentry>
|
|
* <varlistentry><term></term><listitem><para>
|
|
* + It doesn't cause any memory fragmentation, within its scope, separate alloca()
|
|
* blocks just build up and are released together at function end.
|
|
* </para></listitem></varlistentry>
|
|
* <varlistentry><term></term><listitem><para>
|
|
* - Allocation sizes have to fit into the current stack frame. For instance in a
|
|
* threaded environment on Linux, the per-thread stack size is limited to 2 Megabytes,
|
|
* so be sparse with alloca() uses.
|
|
* </para></listitem></varlistentry>
|
|
* <varlistentry><term></term><listitem><para>
|
|
* - Allocation failure due to insufficient stack space is not indicated with a %NULL
|
|
* return like e.g. with malloc(). Instead, most systems probably handle it the same
|
|
* way as out of stack space situations from infinite function recursion, i.e.
|
|
* with a segmentation fault.
|
|
* </para></listitem></varlistentry>
|
|
* <varlistentry><term></term><listitem><para>
|
|
* - Special care has to be taken when mixing alloca() with GNU C variable sized arrays.
|
|
* Stack space allocated with alloca() in the same scope as a variable sized array
|
|
* will be freed together with the variable sized array upon exit of that scope, and
|
|
* not upon exit of the enclosing function scope.
|
|
* </para></listitem></varlistentry>
|
|
* </variablelist>
|
|
*
|
|
* Returns: space for @size bytes, allocated on the stack
|
|
*/
|
|
#define g_alloca(size) alloca (size)
|
|
/**
|
|
* g_newa:
|
|
* @struct_type: Type of memory chunks to be allocated
|
|
* @n_structs: Number of chunks to be allocated
|
|
*
|
|
* Wraps g_alloca() in a more typesafe manner.
|
|
*
|
|
* Returns: Pointer to stack space for @n_structs chunks of type @struct_type
|
|
*/
|
|
#define g_newa(struct_type, n_structs) ((struct_type*) g_alloca (sizeof (struct_type) * (gsize) (n_structs)))
|
|
|
|
#endif /* __G_ALLOCA_H__ */
|