gmem.h 7.28 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
/* 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
24
 * GLib at ftp://ftp.gtk.org/pub/gtk/.
25 26
 */

27
#if defined(G_DISABLE_SINGLE_INCLUDES) && !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
28 29 30
#error "Only <glib.h> can be included directly."
#endif

31 32 33
#ifndef __G_MEM_H__
#define __G_MEM_H__

34
#include <glib/gslice.h>
35
#include <glib/gtypes.h>
36

37 38 39 40 41 42 43 44 45 46 47 48 49
G_BEGIN_DECLS

typedef struct _GMemVTable GMemVTable;


#if GLIB_SIZEOF_VOID_P > GLIB_SIZEOF_LONG
#  define G_MEM_ALIGN	GLIB_SIZEOF_VOID_P
#else	/* GLIB_SIZEOF_VOID_P <= GLIB_SIZEOF_LONG */
#  define G_MEM_ALIGN	GLIB_SIZEOF_LONG
#endif	/* GLIB_SIZEOF_VOID_P <= GLIB_SIZEOF_LONG */


/* Memory allocation functions
50
 */
51 52 53

void	 g_free	          (gpointer	 mem);

54 55
gpointer g_malloc         (gsize	 n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
gpointer g_malloc0        (gsize	 n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
56
gpointer g_realloc        (gpointer	 mem,
57
			   gsize	 n_bytes) G_GNUC_WARN_UNUSED_RESULT;
58 59
gpointer g_try_malloc     (gsize	 n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
gpointer g_try_malloc0    (gsize	 n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
60
gpointer g_try_realloc    (gpointer	 mem,
61
			   gsize	 n_bytes) G_GNUC_WARN_UNUSED_RESULT;
62

63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78
gpointer g_malloc_n       (gsize	 n_blocks,
			   gsize	 n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
gpointer g_malloc0_n      (gsize	 n_blocks,
			   gsize	 n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
gpointer g_realloc_n      (gpointer	 mem,
			   gsize	 n_blocks,
			   gsize	 n_block_bytes) G_GNUC_WARN_UNUSED_RESULT;
gpointer g_try_malloc_n   (gsize	 n_blocks,
			   gsize	 n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
gpointer g_try_malloc0_n  (gsize	 n_blocks,
			   gsize	 n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
gpointer g_try_realloc_n  (gpointer	 mem,
			   gsize	 n_blocks,
			   gsize	 n_block_bytes) G_GNUC_WARN_UNUSED_RESULT;


79 80 81
/* Optimise: avoid the call to the (slower) _n function if we can
 * determine at compile-time that no overflow happens.
 */
82
#if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
83 84 85
#  define _G_NEW(struct_type, n_structs, func) \
	(struct_type *) (__extension__ ({			\
	  gsize __n = (gsize) (n_structs);			\
Behdad Esfahbod's avatar
Behdad Esfahbod committed
86
	  gsize __s = sizeof (struct_type);			\
87
	  gpointer __p;						\
Behdad Esfahbod's avatar
Behdad Esfahbod committed
88
	  if (__s == 1)			\
89 90
	    __p = g_##func (__n);				\
	  else if (__builtin_constant_p (__n) &&		\
91
	           (__s == 0 || __n <= G_MAXSIZE / __s))	\
Behdad Esfahbod's avatar
Behdad Esfahbod committed
92
	    __p = g_##func (__n * __s);				\
93
	  else							\
Behdad Esfahbod's avatar
Behdad Esfahbod committed
94
	    __p = g_##func##_n (__n, __s);			\
95 96
	  __p;							\
	}))
97 98 99
#  define _G_RENEW(struct_type, mem, n_structs, func) \
	(struct_type *) (__extension__ ({			\
	  gsize __n = (gsize) (n_structs);			\
Behdad Esfahbod's avatar
Behdad Esfahbod committed
100
	  gsize __s = sizeof (struct_type);			\
101
	  gpointer __p = (gpointer) (mem);			\
Behdad Esfahbod's avatar
Behdad Esfahbod committed
102
	  if (__s == 1)						\
103 104
	    __p = g_##func (__p, __n);				\
	  else if (__builtin_constant_p (__n) &&		\
105
	           (__s == 0 || __n <= G_MAXSIZE / __s))	\
Behdad Esfahbod's avatar
Behdad Esfahbod committed
106
	    __p = g_##func (__p, __n * __s);			\
107
	  else							\
Behdad Esfahbod's avatar
Behdad Esfahbod committed
108
	    __p = g_##func##_n (__p, __n, __s);			\
109 110 111
	  __p;							\
	}))

112
#else
113

114
/* Unoptimised version: always call the _n() function. */
115

116 117 118 119 120 121
#define _G_NEW(struct_type, n_structs, func) \
        ((struct_type *) g_##func##_n ((n_structs), sizeof (struct_type)))
#define _G_RENEW(struct_type, mem, n_structs, func) \
        ((struct_type *) g_##func##_n (mem, (n_structs), sizeof (struct_type)))

#endif
122

123 124 125 126 127 128
#define g_new(struct_type, n_structs)			_G_NEW (struct_type, n_structs, malloc)
#define g_new0(struct_type, n_structs)			_G_NEW (struct_type, n_structs, malloc0)
#define g_renew(struct_type, mem, n_structs)		_G_RENEW (struct_type, mem, n_structs, realloc)
#define g_try_new(struct_type, n_structs)		_G_NEW (struct_type, n_structs, try_malloc)
#define g_try_new0(struct_type, n_structs)		_G_NEW (struct_type, n_structs, try_malloc0)
#define g_try_renew(struct_type, mem, n_structs)	_G_RENEW (struct_type, mem, n_structs, try_realloc)
129

130 131 132 133 134

/* Memory allocation virtualization for debugging purposes
 * g_mem_set_vtable() has to be the very first GLib function called
 * if being used
 */
135
struct _GMemVTable {
136 137 138 139
  gpointer (*malloc)      (gsize    n_bytes);
  gpointer (*realloc)     (gpointer mem,
			   gsize    n_bytes);
  void     (*free)        (gpointer mem);
Thomas Vander Stichele's avatar
Thomas Vander Stichele committed
140
  /* optional; set to NULL if not used ! */
141 142 143 144 145 146 147
  gpointer (*calloc)      (gsize    n_blocks,
			   gsize    n_block_bytes);
  gpointer (*try_malloc)  (gsize    n_bytes);
  gpointer (*try_realloc) (gpointer mem,
			   gsize    n_bytes);
};
void	 g_mem_set_vtable (GMemVTable	*vtable);
148
gboolean g_mem_is_system_malloc (void);
149

150 151
GLIB_VAR gboolean g_mem_gc_friendly;

152
/* Memory profiler and checker, has to be enabled via g_mem_set_vtable()
153
 */
154
GLIB_VAR GMemVTable	*glib_mem_profiler_table;
155
void	g_mem_profile	(void);
156

157 158

/* deprecated memchunks and allocators */
159
#if !defined (G_DISABLE_DEPRECATED) || defined (GTK_COMPILATION) || defined (GDK_COMPILATION)
160 161
typedef struct _GAllocator GAllocator;
typedef struct _GMemChunk  GMemChunk;
162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178
#define g_mem_chunk_create(type, pre_alloc, alloc_type)	( \
  g_mem_chunk_new (#type " mem chunks (" #pre_alloc ")", \
		   sizeof (type), \
		   sizeof (type) * (pre_alloc), \
		   (alloc_type)) \
)
#define g_chunk_new(type, chunk)	( \
  (type *) g_mem_chunk_alloc (chunk) \
)
#define g_chunk_new0(type, chunk)	( \
  (type *) g_mem_chunk_alloc0 (chunk) \
)
#define g_chunk_free(mem, mem_chunk)	G_STMT_START { \
  g_mem_chunk_free ((mem_chunk), (mem)); \
} G_STMT_END
#define G_ALLOC_ONLY	  1
#define G_ALLOC_AND_FREE  2
Havoc Pennington's avatar
Havoc Pennington committed
179 180
GMemChunk* g_mem_chunk_new     (const gchar *name,
				gint         atom_size,
181
				gsize        area_size,
Havoc Pennington's avatar
Havoc Pennington committed
182 183 184 185 186 187 188 189 190 191
				gint         type);
void       g_mem_chunk_destroy (GMemChunk   *mem_chunk);
gpointer   g_mem_chunk_alloc   (GMemChunk   *mem_chunk);
gpointer   g_mem_chunk_alloc0  (GMemChunk   *mem_chunk);
void       g_mem_chunk_free    (GMemChunk   *mem_chunk,
				gpointer     mem);
void       g_mem_chunk_clean   (GMemChunk   *mem_chunk);
void       g_mem_chunk_reset   (GMemChunk   *mem_chunk);
void       g_mem_chunk_print   (GMemChunk   *mem_chunk);
void       g_mem_chunk_info    (void);
192 193 194 195 196 197 198 199
void	   g_blow_chunks       (void);
GAllocator*g_allocator_new     (const gchar  *name,
				guint         n_preallocs);
void       g_allocator_free    (GAllocator   *allocator);
#define	G_ALLOCATOR_LIST       (1)
#define	G_ALLOCATOR_SLIST      (2)
#define	G_ALLOCATOR_NODE       (3)
#endif /* G_DISABLE_DEPRECATED */
200 201 202 203

G_END_DECLS

#endif /* __G_MEM_H__ */