mirror of
https://gitlab.gnome.org/GNOME/glib.git
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0fc7f409f6
This reverts commit c0146be3a4.
The revert was originally added because the original change broke
gnome-build-meta. Now that the problem has been diagnosed, the original
commit can be fixed — see the commit which follows this one.
See: !1487
394 lines
14 KiB
C
394 lines
14 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 2.1 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, see <http://www.gnu.org/licenses/>.
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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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#ifndef __G_MEM_H__
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#define __G_MEM_H__
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#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
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#error "Only <glib.h> can be included directly."
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#endif
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#include <glib/gutils.h>
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G_BEGIN_DECLS
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/**
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* GMemVTable:
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* @malloc: function to use for allocating memory.
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* @realloc: function to use for reallocating memory.
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* @free: function to use to free memory.
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* @calloc: function to use for allocating zero-filled memory.
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* @try_malloc: function to use for allocating memory without a default error handler.
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* @try_realloc: function to use for reallocating memory without a default error handler.
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*
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* A set of functions used to perform memory allocation. The same #GMemVTable must
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* be used for all allocations in the same program; a call to g_mem_set_vtable(),
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* if it exists, should be prior to any use of GLib.
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*
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* This functions related to this has been deprecated in 2.46, and no longer work.
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*/
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typedef struct _GMemVTable GMemVTable;
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#if GLIB_SIZEOF_VOID_P > GLIB_SIZEOF_LONG
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/**
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* G_MEM_ALIGN:
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*
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* Indicates the number of bytes to which memory will be aligned on the
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* current platform.
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*/
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# define G_MEM_ALIGN GLIB_SIZEOF_VOID_P
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#else /* GLIB_SIZEOF_VOID_P <= GLIB_SIZEOF_LONG */
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# define G_MEM_ALIGN GLIB_SIZEOF_LONG
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#endif /* GLIB_SIZEOF_VOID_P <= GLIB_SIZEOF_LONG */
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/* Memory allocation functions
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*/
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GLIB_AVAILABLE_IN_ALL
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void g_free (gpointer mem);
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GLIB_AVAILABLE_IN_2_34
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void g_clear_pointer (gpointer *pp,
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GDestroyNotify destroy);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_malloc (gsize n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_malloc0 (gsize n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_realloc (gpointer mem,
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gsize n_bytes) G_GNUC_WARN_UNUSED_RESULT;
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GLIB_AVAILABLE_IN_ALL
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gpointer g_try_malloc (gsize n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_try_malloc0 (gsize n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_try_realloc (gpointer mem,
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gsize n_bytes) G_GNUC_WARN_UNUSED_RESULT;
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GLIB_AVAILABLE_IN_ALL
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gpointer g_malloc_n (gsize n_blocks,
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gsize n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_malloc0_n (gsize n_blocks,
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gsize n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_realloc_n (gpointer mem,
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gsize n_blocks,
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gsize n_block_bytes) G_GNUC_WARN_UNUSED_RESULT;
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GLIB_AVAILABLE_IN_ALL
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gpointer g_try_malloc_n (gsize n_blocks,
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gsize n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_try_malloc0_n (gsize n_blocks,
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gsize n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_try_realloc_n (gpointer mem,
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gsize n_blocks,
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gsize n_block_bytes) G_GNUC_WARN_UNUSED_RESULT;
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#if defined(g_has_typeof) && GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_58
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#define g_clear_pointer(pp, destroy) \
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G_STMT_START { \
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G_STATIC_ASSERT (sizeof *(pp) == sizeof (gpointer)); \
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__typeof__((pp)) _pp = (pp); \
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__typeof__(*(pp)) _ptr = *_pp; \
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*_pp = NULL; \
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if (_ptr) \
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(destroy) (_ptr); \
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} G_STMT_END \
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GLIB_AVAILABLE_MACRO_IN_2_34
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#else /* __GNUC__ */
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#define g_clear_pointer(pp, destroy) \
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G_STMT_START { \
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G_STATIC_ASSERT (sizeof *(pp) == sizeof (gpointer)); \
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/* Only one access, please; work around type aliasing */ \
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union { char *in; gpointer *out; } _pp; \
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gpointer _p; \
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/* This assignment is needed to avoid a gcc warning */ \
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GDestroyNotify _destroy = (GDestroyNotify) (destroy); \
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\
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_pp.in = (char *) (pp); \
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_p = *_pp.out; \
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if (_p) \
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{ \
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*_pp.out = NULL; \
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_destroy (_p); \
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} \
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} G_STMT_END \
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GLIB_AVAILABLE_MACRO_IN_2_34
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#endif /* __GNUC__ */
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/**
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* g_steal_pointer:
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* @pp: (not nullable): a pointer to a pointer
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*
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* Sets @pp to %NULL, returning the value that was there before.
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*
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* Conceptually, this transfers the ownership of the pointer from the
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* referenced variable to the "caller" of the macro (ie: "steals" the
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* reference).
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*
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* The return value will be properly typed, according to the type of
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* @pp.
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*
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* This can be very useful when combined with g_autoptr() to prevent the
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* return value of a function from being automatically freed. Consider
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* the following example (which only works on GCC and clang):
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*
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* |[
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* GObject *
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* create_object (void)
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* {
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* g_autoptr(GObject) obj = g_object_new (G_TYPE_OBJECT, NULL);
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*
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* if (early_error_case)
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* return NULL;
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*
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* return g_steal_pointer (&obj);
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* }
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* ]|
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*
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* It can also be used in similar ways for 'out' parameters and is
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* particularly useful for dealing with optional out parameters:
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*
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* |[
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* gboolean
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* get_object (GObject **obj_out)
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* {
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* g_autoptr(GObject) obj = g_object_new (G_TYPE_OBJECT, NULL);
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*
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* if (early_error_case)
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* return FALSE;
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*
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* if (obj_out)
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* *obj_out = g_steal_pointer (&obj);
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*
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* return TRUE;
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* }
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* ]|
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*
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* In the above example, the object will be automatically freed in the
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* early error case and also in the case that %NULL was given for
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* @obj_out.
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*
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* Since: 2.44
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*/
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GLIB_AVAILABLE_STATIC_INLINE_IN_2_44
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static inline gpointer
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g_steal_pointer (gpointer pp)
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{
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gpointer *ptr = (gpointer *) pp;
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gpointer ref;
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ref = *ptr;
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*ptr = NULL;
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return ref;
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}
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/* type safety */
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#if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) && !defined(__cplusplus) && GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_58
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#define g_steal_pointer(pp) ((__typeof__(*pp)) (g_steal_pointer) (pp))
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#else /* __GNUC__ */
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/* This version does not depend on gcc extensions, but gcc does not warn
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* about incompatible-pointer-types: */
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#define g_steal_pointer(pp) \
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(0 ? (*(pp)) : (g_steal_pointer) (pp))
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#endif /* __GNUC__ */
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/* Optimise: avoid the call to the (slower) _n function if we can
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* determine at compile-time that no overflow happens.
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*/
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#if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
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# define _G_NEW(struct_type, n_structs, func) \
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(struct_type *) (G_GNUC_EXTENSION ({ \
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gsize __n = (gsize) (n_structs); \
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gsize __s = sizeof (struct_type); \
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gpointer __p; \
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if (__s == 1) \
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__p = g_##func (__n); \
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else if (__builtin_constant_p (__n) && \
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(__s == 0 || __n <= G_MAXSIZE / __s)) \
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__p = g_##func (__n * __s); \
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else \
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__p = g_##func##_n (__n, __s); \
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__p; \
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}))
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# define _G_RENEW(struct_type, mem, n_structs, func) \
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(struct_type *) (G_GNUC_EXTENSION ({ \
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gsize __n = (gsize) (n_structs); \
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gsize __s = sizeof (struct_type); \
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gpointer __p = (gpointer) (mem); \
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if (__s == 1) \
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__p = g_##func (__p, __n); \
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else if (__builtin_constant_p (__n) && \
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(__s == 0 || __n <= G_MAXSIZE / __s)) \
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__p = g_##func (__p, __n * __s); \
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else \
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__p = g_##func##_n (__p, __n, __s); \
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__p; \
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}))
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#else
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/* Unoptimised version: always call the _n() function. */
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#define _G_NEW(struct_type, n_structs, func) \
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((struct_type *) g_##func##_n ((n_structs), sizeof (struct_type)))
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#define _G_RENEW(struct_type, mem, n_structs, func) \
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((struct_type *) g_##func##_n (mem, (n_structs), sizeof (struct_type)))
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#endif
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/**
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* g_new:
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* @struct_type: the type of the elements to allocate
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* @n_structs: the number of elements to allocate
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*
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* Allocates @n_structs elements of type @struct_type.
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* The returned pointer is cast to a pointer to the given type.
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* If @n_structs is 0 it returns %NULL.
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* Care is taken to avoid overflow when calculating the size of the allocated block.
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*
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* Since the returned pointer is already casted to the right type,
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* it is normally unnecessary to cast it explicitly, and doing
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* so might hide memory allocation errors.
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*
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* Returns: a pointer to the allocated memory, cast to a pointer to @struct_type
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*/
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#define g_new(struct_type, n_structs) _G_NEW (struct_type, n_structs, malloc)
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/**
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* g_new0:
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* @struct_type: the type of the elements to allocate.
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* @n_structs: the number of elements to allocate.
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*
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* Allocates @n_structs elements of type @struct_type, initialized to 0's.
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* The returned pointer is cast to a pointer to the given type.
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* If @n_structs is 0 it returns %NULL.
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* Care is taken to avoid overflow when calculating the size of the allocated block.
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*
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* Since the returned pointer is already casted to the right type,
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* it is normally unnecessary to cast it explicitly, and doing
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* so might hide memory allocation errors.
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*
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* Returns: a pointer to the allocated memory, cast to a pointer to @struct_type.
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*/
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#define g_new0(struct_type, n_structs) _G_NEW (struct_type, n_structs, malloc0)
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/**
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* g_renew:
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* @struct_type: the type of the elements to allocate
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* @mem: the currently allocated memory
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* @n_structs: the number of elements to allocate
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*
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* Reallocates the memory pointed to by @mem, so that it now has space for
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* @n_structs elements of type @struct_type. It returns the new address of
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* the memory, which may have been moved.
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* Care is taken to avoid overflow when calculating the size of the allocated block.
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*
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* Returns: a pointer to the new allocated memory, cast to a pointer to @struct_type
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*/
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#define g_renew(struct_type, mem, n_structs) _G_RENEW (struct_type, mem, n_structs, realloc)
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/**
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* g_try_new:
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* @struct_type: the type of the elements to allocate
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* @n_structs: the number of elements to allocate
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*
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* Attempts to allocate @n_structs elements of type @struct_type, and returns
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* %NULL on failure. Contrast with g_new(), which aborts the program on failure.
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* The returned pointer is cast to a pointer to the given type.
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* The function returns %NULL when @n_structs is 0 of if an overflow occurs.
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*
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* Since: 2.8
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* Returns: a pointer to the allocated memory, cast to a pointer to @struct_type
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*/
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#define g_try_new(struct_type, n_structs) _G_NEW (struct_type, n_structs, try_malloc)
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/**
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* g_try_new0:
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* @struct_type: the type of the elements to allocate
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* @n_structs: the number of elements to allocate
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*
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* Attempts to allocate @n_structs elements of type @struct_type, initialized
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* to 0's, and returns %NULL on failure. Contrast with g_new0(), which aborts
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* the program on failure.
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* The returned pointer is cast to a pointer to the given type.
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* The function returns %NULL when @n_structs is 0 or if an overflow occurs.
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*
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* Since: 2.8
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* Returns: a pointer to the allocated memory, cast to a pointer to @struct_type
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*/
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#define g_try_new0(struct_type, n_structs) _G_NEW (struct_type, n_structs, try_malloc0)
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/**
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* g_try_renew:
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* @struct_type: the type of the elements to allocate
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* @mem: the currently allocated memory
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* @n_structs: the number of elements to allocate
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*
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* Attempts to reallocate the memory pointed to by @mem, so that it now has
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* space for @n_structs elements of type @struct_type, and returns %NULL on
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* failure. Contrast with g_renew(), which aborts the program on failure.
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* It returns the new address of the memory, which may have been moved.
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* The function returns %NULL if an overflow occurs.
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*
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* Since: 2.8
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* Returns: a pointer to the new allocated memory, cast to a pointer to @struct_type
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*/
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#define g_try_renew(struct_type, mem, n_structs) _G_RENEW (struct_type, mem, n_structs, try_realloc)
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/* Memory allocation virtualization for debugging purposes
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* g_mem_set_vtable() has to be the very first GLib function called
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* if being used
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*/
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struct _GMemVTable {
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gpointer (*malloc) (gsize n_bytes);
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gpointer (*realloc) (gpointer mem,
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gsize n_bytes);
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void (*free) (gpointer mem);
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/* optional; set to NULL if not used ! */
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gpointer (*calloc) (gsize n_blocks,
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gsize n_block_bytes);
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gpointer (*try_malloc) (gsize n_bytes);
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gpointer (*try_realloc) (gpointer mem,
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gsize n_bytes);
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};
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GLIB_DEPRECATED_IN_2_46
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void g_mem_set_vtable (GMemVTable *vtable);
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GLIB_DEPRECATED_IN_2_46
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gboolean g_mem_is_system_malloc (void);
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GLIB_VAR gboolean g_mem_gc_friendly;
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/* Memory profiler and checker, has to be enabled via g_mem_set_vtable()
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*/
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GLIB_VAR GMemVTable *glib_mem_profiler_table;
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GLIB_DEPRECATED_IN_2_46
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void g_mem_profile (void);
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G_END_DECLS
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#endif /* __G_MEM_H__ */
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