glib/gmem.h

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GLib Team.  See the ChangeLog
  23  * 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 #error "Only <glib.h> can be included directly."
  29 #endif
  30
  31 #ifndef __G_MEM_H__
  32 #define __G_MEM_H__
  33
  34 #include <glib/gslice.h>
  35 #include <glib/gtypes.h>
  36
  37 G_BEGIN_DECLS
  38
  39 typedef struct _GMemVTable GMemVTable;
  40
  41
  42 #if GLIB_SIZEOF_VOID_P > GLIB_SIZEOF_LONG
  43 #  define G_MEM_ALIGN   GLIB_SIZEOF_VOID_P
  44 #else   /* GLIB_SIZEOF_VOID_P <= GLIB_SIZEOF_LONG */
  45 #  define G_MEM_ALIGN   GLIB_SIZEOF_LONG
  46 #endif  /* GLIB_SIZEOF_VOID_P <= GLIB_SIZEOF_LONG */
  47
  48
  49 /* Memory allocation functions
  50  */
  51
  52 void     g_free           (gpointer      mem);
  53
  54 gpointer g_malloc         (gsize         n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
  55 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 gpointer g_try_malloc     (gsize         n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
  59 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 gpointer g_malloc_n       (gsize         n_blocks,
  64                            gsize         n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
  65 gpointer g_malloc0_n      (gsize         n_blocks,
  66                            gsize         n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
  67 gpointer g_realloc_n      (gpointer      mem,
  68                            gsize         n_blocks,
  69                            gsize         n_block_bytes) G_GNUC_WARN_UNUSED_RESULT;
  70 gpointer g_try_malloc_n   (gsize         n_blocks,
  71                            gsize         n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
  72 gpointer g_try_malloc0_n  (gsize         n_blocks,
  73                            gsize         n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2);
  74 gpointer g_try_realloc_n  (gpointer      mem,
  75                            gsize         n_blocks,
  76                            gsize         n_block_bytes) G_GNUC_WARN_UNUSED_RESULT;
  77
  78
  79 /* Optimise: avoid the call to the (slower) _n function if we can
  80  * determine at compile-time that no overflow happens.
  81  */
  82 #if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
  83 #  define _G_NEW(struct_type, n_structs, func) \
  84         (struct_type *) (__extension__ ({                       \
  85           gsize __n = (gsize) (n_structs);                      \
  86           gsize __s = sizeof (struct_type);                     \
  87           gpointer __p;                                         \
  88           if (__s == 1)                 \
  89             __p = g_##func (__n);                               \
  90           else if (__builtin_constant_p (__n) &&                \
  91                    __n <= G_MAXSIZE / __s)                      \
  92             __p = g_##func (__n * __s);                         \
  93           else                                                  \
  94             __p = g_##func##_n (__n, __s);                      \
  95           __p;                                                  \
  96         }))
  97 #  define _G_RENEW(struct_type, mem, n_structs, func) \
  98         (struct_type *) (__extension__ ({                       \
  99           gsize __n = (gsize) (n_structs);                      \
 100           gsize __s = sizeof (struct_type);                     \
 101           gpointer __p = (gpointer) (mem);                      \
 102           if (__s == 1)                                         \
 103             __p = g_##func (__p, __n);                          \
 104           else if (__builtin_constant_p (__n) &&                \
 105                    __n <= G_MAXSIZE / __s)                      \
 106             __p = g_##func (__p, __n * __s);                    \
 107           else                                                  \
 108             __p = g_##func##_n (__p, __n, __s);                 \
 109           __p;                                                  \
 110         }))
 111
 112 #else
 113
 114 /* Unoptimised version: always call the _n() function. */
 115
 116 #define _G_NEW(struct_type, n_structs, func) \
 117         ((struct_type *) g_##func##_n ((n_structs), sizeof (struct_type)))
 118 #define _G_RENEW(struct_type, mem, n_structs, func) \
 119         ((struct_type *) g_##func##_n (mem, (n_structs), sizeof (struct_type)))
 120
 121 #endif
 122
 123 #define g_new(struct_type, n_structs)                   _G_NEW (struct_type, n_structs, malloc)
 124 #define g_new0(struct_type, n_structs)                  _G_NEW (struct_type, n_structs, malloc0)
 125 #define g_renew(struct_type, mem, n_structs)            _G_RENEW (struct_type, mem, n_structs, realloc)
 126 #define g_try_new(struct_type, n_structs)               _G_NEW (struct_type, n_structs, try_malloc)
 127 #define g_try_new0(struct_type, n_structs)              _G_NEW (struct_type, n_structs, try_malloc0)
 128 #define g_try_renew(struct_type, mem, n_structs)        _G_RENEW (struct_type, mem, n_structs, try_realloc)
 129
 130
 131 /* Memory allocation virtualization for debugging purposes
 132  * g_mem_set_vtable() has to be the very first GLib function called
 133  * if being used
 134  */
 135 struct _GMemVTable {
 136   gpointer (*malloc)      (gsize    n_bytes);
 137   gpointer (*realloc)     (gpointer mem,
 138                            gsize    n_bytes);
 139   void     (*free)        (gpointer mem);
 140   /* optional; set to NULL if not used ! */
 141   gpointer (*calloc)      (gsize    n_blocks,
 142                            gsize    n_block_bytes);
 143   gpointer (*try_malloc)  (gsize    n_bytes);
 144   gpointer (*try_realloc) (gpointer mem,
 145                            gsize    n_bytes);
 146 };
 147 void     g_mem_set_vtable (GMemVTable   *vtable);
 148 gboolean g_mem_is_system_malloc (void);
 149
 150 GLIB_VAR gboolean g_mem_gc_friendly;
 151
 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 typedef struct _GAllocator GAllocator;
 161 typedef struct _GMemChunk  GMemChunk;
 162 #define g_mem_chunk_create(type, pre_alloc, alloc_type) ( \
 163   g_mem_chunk_new (#type " mem chunks (" #pre_alloc ")", \
 164                    sizeof (type), \
 165                    sizeof (type) * (pre_alloc), \
 166                    (alloc_type)) \
 167 )
 168 #define g_chunk_new(type, chunk)        ( \
 169   (type *) g_mem_chunk_alloc (chunk) \
 170 )
 171 #define g_chunk_new0(type, chunk)       ( \
 172   (type *) g_mem_chunk_alloc0 (chunk) \
 173 )
 174 #define g_chunk_free(mem, mem_chunk)    G_STMT_START { \
 175   g_mem_chunk_free ((mem_chunk), (mem)); \
 176 } G_STMT_END
 177 #define G_ALLOC_ONLY      1
 178 #define G_ALLOC_AND_FREE  2
 179 GMemChunk* g_mem_chunk_new     (const gchar *name,
 180                                 gint         atom_size,
 181                                 gsize        area_size,
 182                                 gint         type);
 183 void       g_mem_chunk_destroy (GMemChunk   *mem_chunk);
 184 gpointer   g_mem_chunk_alloc   (GMemChunk   *mem_chunk);
 185 gpointer   g_mem_chunk_alloc0  (GMemChunk   *mem_chunk);
 186 void       g_mem_chunk_free    (GMemChunk   *mem_chunk,
 187                                 gpointer     mem);
 188 void       g_mem_chunk_clean   (GMemChunk   *mem_chunk);
 189 void       g_mem_chunk_reset   (GMemChunk   *mem_chunk);
 190 void       g_mem_chunk_print   (GMemChunk   *mem_chunk);
 191 void       g_mem_chunk_info    (void);
 192 void       g_blow_chunks       (void);
 193 GAllocator*g_allocator_new     (const gchar  *name,
 194                                 guint         n_preallocs);
 195 void       g_allocator_free    (GAllocator   *allocator);
 196 #define G_ALLOCATOR_LIST       (1)
 197 #define G_ALLOCATOR_SLIST      (2)
 198 #define G_ALLOCATOR_NODE       (3)
 199 #endif /* G_DISABLE_DEPRECATED */
 200
 201 G_END_DECLS
 202
 203 #endif /* __G_MEM_H__ */