LCOV - code coverage report
Current view: top level - glib - gmem.c (source / functions) Coverage Total Hit
Test: unnamed Lines: 85.0 % 120 102
Test Date: 2026-01-20 05:15:58 Functions: 86.4 % 22 19
Branches: - 0 0

             Branch data     Line data    Source code
       1                 :             : /* GLIB - Library of useful routines for C programming
       2                 :             :  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
       3                 :             :  *
       4                 :             :  * SPDX-License-Identifier: LGPL-2.1-or-later
       5                 :             :  *
       6                 :             :  * This library is free software; you can redistribute it and/or
       7                 :             :  * modify it under the terms of the GNU Lesser General Public
       8                 :             :  * License as published by the Free Software Foundation; either
       9                 :             :  * version 2.1 of the License, or (at your option) any later version.
      10                 :             :  *
      11                 :             :  * This library is distributed in the hope that it will be useful,
      12                 :             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13                 :             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14                 :             :  * Lesser General Public License for more details.
      15                 :             :  *
      16                 :             :  * You should have received a copy of the GNU Lesser General Public
      17                 :             :  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
      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                 :             : /* 
      28                 :             :  * MT safe
      29                 :             :  */
      30                 :             : 
      31                 :             : #include "config.h"
      32                 :             : 
      33                 :             : #include "gmem.h"
      34                 :             : 
      35                 :             : #if defined(HAVE_POSIX_MEMALIGN) && !defined(_XOPEN_SOURCE)
      36                 :             : # define _XOPEN_SOURCE 600
      37                 :             : #endif
      38                 :             : 
      39                 :             : #if defined(HAVE_MEMALIGN) || defined(HAVE__ALIGNED_MALLOC)
      40                 :             : /* Required for _aligned_malloc() and _aligned_free() on Windows */
      41                 :             : #include <malloc.h>
      42                 :             : #endif
      43                 :             : 
      44                 :             : #ifdef HAVE__ALIGNED_MALLOC
      45                 :             : /* _aligned_malloc() takes parameters of aligned_malloc() in reverse order */
      46                 :             : # define aligned_alloc(alignment, size) _aligned_malloc (size, alignment)
      47                 :             : 
      48                 :             : /* _aligned_malloc()'ed memory must be freed by _align_free() on MSVC */
      49                 :             : # define aligned_free(x) _aligned_free (x)
      50                 :             : #else
      51                 :             : # define aligned_free(x) free (x)
      52                 :             : #endif
      53                 :             : 
      54                 :             : #include <stdlib.h>
      55                 :             : #include <string.h>
      56                 :             : #include <signal.h>
      57                 :             : 
      58                 :             : #include "gslice.h"
      59                 :             : #include "gbacktrace.h"
      60                 :             : #include "gtestutils.h"
      61                 :             : #include "gthread.h"
      62                 :             : #include "glib_trace.h"
      63                 :             : 
      64                 :             : /* notes on macros:
      65                 :             :  * having G_DISABLE_CHECKS defined disables use of glib_mem_profiler_table and
      66                 :             :  * g_mem_profile().
      67                 :             :  * If g_mem_gc_friendly is TRUE, freed memory should be 0-wiped.
      68                 :             :  */
      69                 :             : 
      70                 :             : /* --- variables --- */
      71                 :             : static GMemVTable glib_mem_vtable = {
      72                 :             :   malloc,
      73                 :             :   realloc,
      74                 :             :   free,
      75                 :             :   calloc,
      76                 :             :   malloc,
      77                 :             :   realloc,
      78                 :             : };
      79                 :             : 
      80                 :             : /* --- functions --- */
      81                 :             : /**
      82                 :             :  * g_malloc:
      83                 :             :  * @n_bytes: the number of bytes to allocate
      84                 :             :  *
      85                 :             :  * Allocates @n_bytes bytes of memory.
      86                 :             :  * If @n_bytes is 0 it returns %NULL.
      87                 :             :  *
      88                 :             :  * If the allocation fails (because the system is out of memory),
      89                 :             :  * the program is terminated.
      90                 :             :  *
      91                 :             :  * Returns: a pointer to the allocated memory
      92                 :             :  */
      93                 :             : gpointer
      94                 :    82327701 : g_malloc (gsize n_bytes)
      95                 :             : {
      96                 :    82327701 :   if (G_LIKELY (n_bytes))
      97                 :             :     {
      98                 :             :       gpointer mem;
      99                 :             : 
     100                 :    82310031 :       mem = malloc (n_bytes);
     101                 :    82310031 :       TRACE (GLIB_MEM_ALLOC ((void *) mem, n_bytes, 0, 0));
     102                 :    82310031 :       if (mem)
     103                 :    82310031 :         return mem;
     104                 :             : 
     105                 :           0 :       g_error ("%s: failed to allocate %"G_GSIZE_FORMAT" bytes",
     106                 :             :                G_STRLOC, n_bytes);
     107                 :             :     }
     108                 :             : 
     109                 :       17670 :   TRACE (GLIB_MEM_ALLOC ((void *) NULL, n_bytes, 0, 0));
     110                 :             : 
     111                 :       17670 :   return NULL;
     112                 :             : }
     113                 :             : 
     114                 :             : /**
     115                 :             :  * g_malloc0:
     116                 :             :  * @n_bytes: the number of bytes to allocate
     117                 :             :  *
     118                 :             :  * Allocates @n_bytes bytes of memory, initialized to 0's.
     119                 :             :  * If @n_bytes is 0 it returns %NULL.
     120                 :             :  *
     121                 :             :  * If the allocation fails (because the system is out of memory),
     122                 :             :  * the program is terminated.
     123                 :             :  *
     124                 :             :  * Returns: a pointer to the allocated memory
     125                 :             :  */
     126                 :             : gpointer
     127                 :    14736771 : g_malloc0 (gsize n_bytes)
     128                 :             : {
     129                 :    14736771 :   if (G_LIKELY (n_bytes))
     130                 :             :     {
     131                 :             :       gpointer mem;
     132                 :             : 
     133                 :    14736708 :       mem = calloc (1, n_bytes);
     134                 :    14736708 :       TRACE (GLIB_MEM_ALLOC ((void *) mem, n_bytes, 1, 0));
     135                 :    14736708 :       if (mem)
     136                 :    14736708 :         return mem;
     137                 :             : 
     138                 :           0 :       g_error ("%s: failed to allocate %"G_GSIZE_FORMAT" bytes",
     139                 :             :                G_STRLOC, n_bytes);
     140                 :             :     }
     141                 :             : 
     142                 :          63 :   TRACE (GLIB_MEM_ALLOC ((void *) NULL, n_bytes, 1, 0));
     143                 :             : 
     144                 :          63 :   return NULL;
     145                 :             : }
     146                 :             : 
     147                 :             : /**
     148                 :             :  * g_realloc:
     149                 :             :  * @mem: (nullable): the memory to reallocate
     150                 :             :  * @n_bytes: new size of the memory in bytes
     151                 :             :  *
     152                 :             :  * Reallocates the memory pointed to by @mem, so that it now has space for
     153                 :             :  * @n_bytes bytes of memory. It returns the new address of the memory, which may
     154                 :             :  * have been moved. @mem may be %NULL, in which case it's considered to
     155                 :             :  * have zero-length. @n_bytes may be 0, in which case %NULL will be returned
     156                 :             :  * and @mem will be freed unless it is %NULL.
     157                 :             :  *
     158                 :             :  * If the allocation fails (because the system is out of memory),
     159                 :             :  * the program is terminated.
     160                 :             :  *
     161                 :             :  * Returns: the new address of the allocated memory
     162                 :             :  */
     163                 :             : gpointer
     164                 :     5362349 : g_realloc (gpointer mem,
     165                 :             :            gsize    n_bytes)
     166                 :             : {
     167                 :             :   gpointer newmem;
     168                 :             : 
     169                 :     5362349 :   if (G_LIKELY (n_bytes))
     170                 :             :     {
     171                 :     5360257 :       newmem = realloc (mem, n_bytes);
     172                 :     5360257 :       TRACE (GLIB_MEM_REALLOC ((void *) newmem, (void *) mem, n_bytes, 0));
     173                 :     5360257 :       if (newmem)
     174                 :     5360257 :         return newmem;
     175                 :             : 
     176                 :           0 :       g_error ("%s: failed to allocate %"G_GSIZE_FORMAT" bytes",
     177                 :             :                G_STRLOC, n_bytes);
     178                 :             :     }
     179                 :             : 
     180                 :        2092 :   free (mem);
     181                 :             : 
     182                 :        2092 :   TRACE (GLIB_MEM_REALLOC((void*) NULL, (void*)mem, 0, 0));
     183                 :             : 
     184                 :        2092 :   return NULL;
     185                 :             : }
     186                 :             : 
     187                 :             : /**
     188                 :             :  * g_free:
     189                 :             :  * @mem: (nullable): the memory to free
     190                 :             :  * 
     191                 :             :  * Frees the memory pointed to by @mem.
     192                 :             :  *
     193                 :             :  * If you know the allocated size of @mem, calling g_free_sized() may be faster,
     194                 :             :  * depending on the libc implementation in use.
     195                 :             :  *
     196                 :             :  * Starting from GLib 2.78, this may happen automatically in case a GCC
     197                 :             :  * compatible compiler is used with some optimization level and the allocated
     198                 :             :  * size is known at compile time (see [documentation of
     199                 :             :  * `__builtin_object_size()`](https://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html)
     200                 :             :  * to understand its caveats).
     201                 :             :  *
     202                 :             :  * If @mem is %NULL it simply returns, so there is no need to check @mem
     203                 :             :  * against %NULL before calling this function.
     204                 :             :  */
     205                 :             : void
     206                 :    74647890 : (g_free) (gpointer mem)
     207                 :             : {
     208                 :    74647890 :   free (mem);
     209                 :    74647890 :   TRACE(GLIB_MEM_FREE((void*) mem));
     210                 :    74647890 : }
     211                 :             : 
     212                 :             : /**
     213                 :             :  * g_free_sized:
     214                 :             :  * @mem: (nullable): the memory to free
     215                 :             :  * @size: size of @mem, in bytes
     216                 :             :  *
     217                 :             :  * Frees the memory pointed to by @mem, assuming it is has the given @size.
     218                 :             :  *
     219                 :             :  * If @mem is %NULL this is a no-op (and @size is ignored).
     220                 :             :  *
     221                 :             :  * It is an error if @size doesn’t match the size passed when @mem was
     222                 :             :  * allocated. @size is passed to this function to allow optimizations in the
     223                 :             :  * allocator. If you don’t know the allocation size, use g_free() instead.
     224                 :             :  *
     225                 :             :  * In case a GCC compatible compiler is used, this function may be used
     226                 :             :  * automatically via g_free() if the allocated size is known at compile time,
     227                 :             :  * since GLib 2.78.
     228                 :             :  *
     229                 :             :  * Since: 2.76
     230                 :             :  */
     231                 :             : void
     232                 :    48265960 : g_free_sized (void   *mem,
     233                 :             :               size_t  size)
     234                 :             : {
     235                 :             : #ifdef HAVE_FREE_SIZED
     236                 :             :   free_sized (mem, size);
     237                 :             : #else
     238                 :    48265960 :   free (mem);
     239                 :             : #endif
     240                 :    48265960 :   TRACE (GLIB_MEM_FREE ((void*) mem));
     241                 :    48265960 : }
     242                 :             : 
     243                 :             : /**
     244                 :             :  * g_clear_pointer: (skip)
     245                 :             :  * @pp: (nullable) (not optional) (inout) (transfer full): a pointer to a
     246                 :             :  *   variable, struct member etc. holding a pointer
     247                 :             :  * @destroy: a function to which a gpointer can be passed, to destroy `*pp`
     248                 :             :  *
     249                 :             :  * Clears a reference to a variable.
     250                 :             :  *
     251                 :             :  * @pp must not be %NULL.
     252                 :             :  *
     253                 :             :  * If the reference is %NULL then this function does nothing.
     254                 :             :  * Otherwise, the variable is destroyed using @destroy and the
     255                 :             :  * pointer is set to %NULL.
     256                 :             :  *
     257                 :             :  * A macro is also included that allows this function to be used without
     258                 :             :  * pointer casts. This will mask any warnings about incompatible function types
     259                 :             :  * or calling conventions, so you must ensure that your @destroy function is
     260                 :             :  * compatible with being called as [callback@GLib.DestroyNotify] using the
     261                 :             :  * standard calling convention for the platform that GLib was compiled for;
     262                 :             :  * otherwise the program will experience undefined behaviour.
     263                 :             :  *
     264                 :             :  * Examples of this kind of undefined behaviour include using many Windows Win32
     265                 :             :  * APIs, as well as many if not all OpenGL and Vulkan calls on 32-bit Windows,
     266                 :             :  * which typically use the `__stdcall` calling convention rather than the
     267                 :             :  * `__cdecl` calling convention.
     268                 :             :  *
     269                 :             :  * The affected functions can be used by wrapping them in a
     270                 :             :  * [callback@GLib.DestroyNotify] that is declared with the standard calling
     271                 :             :  * convention:
     272                 :             :  *
     273                 :             :  * ```c
     274                 :             :  * // Wrapper needed to avoid mismatched calling conventions on Windows
     275                 :             :  * static void
     276                 :             :  * destroy_sync (void *sync)
     277                 :             :  * {
     278                 :             :  *   glDeleteSync (sync);
     279                 :             :  * }
     280                 :             :  *
     281                 :             :  * // …
     282                 :             :  *
     283                 :             :  * g_clear_pointer (&sync, destroy_sync);
     284                 :             :  * ```
     285                 :             : 
     286                 :             :  *
     287                 :             :  * Since: 2.34
     288                 :             :  **/
     289                 :             : #undef g_clear_pointer
     290                 :             : void
     291                 :           6 : g_clear_pointer (gpointer      *pp,
     292                 :             :                  GDestroyNotify destroy)
     293                 :             : {
     294                 :             :   gpointer _p;
     295                 :             : 
     296                 :           6 :   _p = *pp;
     297                 :           6 :   if (_p)
     298                 :             :     {
     299                 :           6 :       *pp = NULL;
     300                 :           6 :       destroy (_p);
     301                 :             :     }
     302                 :           6 : }
     303                 :             : 
     304                 :             : /**
     305                 :             :  * g_try_malloc:
     306                 :             :  * @n_bytes: number of bytes to allocate.
     307                 :             :  * 
     308                 :             :  * Attempts to allocate @n_bytes, and returns %NULL on failure.
     309                 :             :  * Contrast with g_malloc(), which aborts the program on failure.
     310                 :             :  * 
     311                 :             :  * Returns: the allocated memory, or %NULL.
     312                 :             :  */
     313                 :             : gpointer
     314                 :      407401 : g_try_malloc (gsize n_bytes)
     315                 :             : {
     316                 :             :   gpointer mem;
     317                 :             : 
     318                 :      407401 :   if (G_LIKELY (n_bytes))
     319                 :      407395 :     mem = malloc (n_bytes);
     320                 :             :   else
     321                 :           6 :     mem = NULL;
     322                 :             : 
     323                 :      407401 :   TRACE (GLIB_MEM_ALLOC ((void *) mem, n_bytes, 0, 1));
     324                 :             : 
     325                 :      407401 :   return mem;
     326                 :             : }
     327                 :             : 
     328                 :             : /**
     329                 :             :  * g_try_malloc0:
     330                 :             :  * @n_bytes: number of bytes to allocate
     331                 :             :  * 
     332                 :             :  * Attempts to allocate @n_bytes, initialized to 0's, and returns %NULL on
     333                 :             :  * failure. Contrast with g_malloc0(), which aborts the program on failure.
     334                 :             :  * 
     335                 :             :  * Since: 2.8
     336                 :             :  * Returns: the allocated memory, or %NULL
     337                 :             :  */
     338                 :             : gpointer
     339                 :           8 : g_try_malloc0 (gsize n_bytes)
     340                 :             : {
     341                 :             :   gpointer mem;
     342                 :             : 
     343                 :           8 :   if (G_LIKELY (n_bytes))
     344                 :           2 :     mem = calloc (1, n_bytes);
     345                 :             :   else
     346                 :           6 :     mem = NULL;
     347                 :             : 
     348                 :           8 :   return mem;
     349                 :             : }
     350                 :             : 
     351                 :             : /**
     352                 :             :  * g_try_realloc:
     353                 :             :  * @mem: (nullable): previously-allocated memory, or %NULL.
     354                 :             :  * @n_bytes: number of bytes to allocate.
     355                 :             :  * 
     356                 :             :  * Attempts to realloc @mem to a new size, @n_bytes, and returns %NULL
     357                 :             :  * on failure. Contrast with g_realloc(), which aborts the program
     358                 :             :  * on failure.
     359                 :             :  *
     360                 :             :  * If @mem is %NULL, behaves the same as g_try_malloc().
     361                 :             :  * 
     362                 :             :  * Returns: the allocated memory, or %NULL.
     363                 :             :  */
     364                 :             : gpointer
     365                 :          42 : g_try_realloc (gpointer mem,
     366                 :             :                gsize    n_bytes)
     367                 :             : {
     368                 :             :   gpointer newmem;
     369                 :             : 
     370                 :          42 :   if (G_LIKELY (n_bytes))
     371                 :          36 :     newmem = realloc (mem, n_bytes);
     372                 :             :   else
     373                 :             :     {
     374                 :           6 :       newmem = NULL;
     375                 :           6 :       free (mem);
     376                 :             :     }
     377                 :             : 
     378                 :          42 :   TRACE (GLIB_MEM_REALLOC ((void *) newmem, (void *) mem, n_bytes, 1));
     379                 :             : 
     380                 :          42 :   return newmem;
     381                 :             : }
     382                 :             : 
     383                 :             : 
     384                 :             : /**
     385                 :             :  * g_malloc_n:
     386                 :             :  * @n_blocks: the number of blocks to allocate
     387                 :             :  * @n_block_bytes: the size of each block in bytes
     388                 :             :  *
     389                 :             :  * This function is similar to g_malloc(), allocating (@n_blocks * @n_block_bytes) bytes,
     390                 :             :  * but care is taken to detect possible overflow during multiplication.
     391                 :             :  *
     392                 :             :  * If the allocation fails (because the system is out of memory),
     393                 :             :  * the program is terminated.
     394                 :             :  *
     395                 :             :  * Since: 2.24
     396                 :             :  * Returns: a pointer to the allocated memory
     397                 :             :  */
     398                 :             : gpointer
     399                 :    22219927 : g_malloc_n (gsize n_blocks,
     400                 :             :             gsize n_block_bytes)
     401                 :             : {
     402                 :             :   size_t len;
     403                 :             : 
     404                 :    22219927 :   if (!g_size_checked_mul (&len, n_blocks, n_block_bytes))
     405                 :             :     {
     406                 :           0 :       g_error ("%s: overflow allocating %"G_GSIZE_FORMAT"*%"G_GSIZE_FORMAT" bytes",
     407                 :             :                G_STRLOC, n_blocks, n_block_bytes);
     408                 :             :     }
     409                 :             : 
     410                 :    22219927 :   return g_malloc (len);
     411                 :             : }
     412                 :             : 
     413                 :             : /**
     414                 :             :  * g_malloc0_n:
     415                 :             :  * @n_blocks: the number of blocks to allocate
     416                 :             :  * @n_block_bytes: the size of each block in bytes
     417                 :             :  *
     418                 :             :  * This function is similar to g_malloc0(), allocating (@n_blocks * @n_block_bytes) bytes,
     419                 :             :  * but care is taken to detect possible overflow during multiplication.
     420                 :             :  *
     421                 :             :  * If the allocation fails (because the system is out of memory),
     422                 :             :  * the program is terminated.
     423                 :             :  *
     424                 :             :  * Since: 2.24
     425                 :             :  * Returns: a pointer to the allocated memory
     426                 :             :  */
     427                 :             : gpointer
     428                 :     4783537 : g_malloc0_n (gsize n_blocks,
     429                 :             :              gsize n_block_bytes)
     430                 :             : {
     431                 :             :   size_t len;
     432                 :             : 
     433                 :     4783537 :   if (!g_size_checked_mul (&len, n_blocks, n_block_bytes))
     434                 :             :     {
     435                 :           0 :       g_error ("%s: overflow allocating %"G_GSIZE_FORMAT"*%"G_GSIZE_FORMAT" bytes",
     436                 :             :                G_STRLOC, n_blocks, n_block_bytes);
     437                 :             :     }
     438                 :             : 
     439                 :     4783537 :   return g_malloc0 (len);
     440                 :             : }
     441                 :             : 
     442                 :             : /**
     443                 :             :  * g_realloc_n:
     444                 :             :  * @mem: (nullable): the memory to reallocate
     445                 :             :  * @n_blocks: the number of blocks to allocate
     446                 :             :  * @n_block_bytes: the size of each block in bytes
     447                 :             :  *
     448                 :             :  * This function is similar to g_realloc(), allocating (@n_blocks * @n_block_bytes) bytes,
     449                 :             :  * but care is taken to detect possible overflow during multiplication.
     450                 :             :  *
     451                 :             :  * If the allocation fails (because the system is out of memory),
     452                 :             :  * the program is terminated.
     453                 :             :  *
     454                 :             :  * Since: 2.24
     455                 :             :  * Returns: the new address of the allocated memory
     456                 :             :  */
     457                 :             : gpointer
     458                 :      383380 : g_realloc_n (gpointer mem,
     459                 :             :              gsize    n_blocks,
     460                 :             :              gsize    n_block_bytes)
     461                 :             : {
     462                 :             :   size_t len;
     463                 :             : 
     464                 :      383380 :   if (!g_size_checked_mul (&len, n_blocks, n_block_bytes))
     465                 :             :     {
     466                 :           0 :       g_error ("%s: overflow allocating %"G_GSIZE_FORMAT"*%"G_GSIZE_FORMAT" bytes",
     467                 :             :                G_STRLOC, n_blocks, n_block_bytes);
     468                 :             :     }
     469                 :             : 
     470                 :      383380 :   return g_realloc (mem, len);
     471                 :             : }
     472                 :             : 
     473                 :             : /**
     474                 :             :  * g_try_malloc_n:
     475                 :             :  * @n_blocks: the number of blocks to allocate
     476                 :             :  * @n_block_bytes: the size of each block in bytes
     477                 :             :  * 
     478                 :             :  * This function is similar to g_try_malloc(), allocating (@n_blocks * @n_block_bytes) bytes,
     479                 :             :  * but care is taken to detect possible overflow during multiplication.
     480                 :             :  * 
     481                 :             :  * Since: 2.24
     482                 :             :  * Returns: the allocated memory, or %NULL.
     483                 :             :  */
     484                 :             : gpointer
     485                 :      406570 : g_try_malloc_n (gsize n_blocks,
     486                 :             :                 gsize n_block_bytes)
     487                 :             : {
     488                 :             :   size_t len;
     489                 :             : 
     490                 :      406570 :   if (!g_size_checked_mul (&len, n_blocks, n_block_bytes))
     491                 :           4 :     return NULL;
     492                 :             : 
     493                 :      406566 :   return g_try_malloc (len);
     494                 :             : }
     495                 :             : 
     496                 :             : /**
     497                 :             :  * g_try_malloc0_n:
     498                 :             :  * @n_blocks: the number of blocks to allocate
     499                 :             :  * @n_block_bytes: the size of each block in bytes
     500                 :             :  * 
     501                 :             :  * This function is similar to g_try_malloc0(), allocating (@n_blocks * @n_block_bytes) bytes,
     502                 :             :  * but care is taken to detect possible overflow during multiplication.
     503                 :             :  * 
     504                 :             :  * Since: 2.24
     505                 :             :  * Returns: the allocated memory, or %NULL
     506                 :             :  */
     507                 :             : gpointer
     508                 :           6 : g_try_malloc0_n (gsize n_blocks,
     509                 :             :                  gsize n_block_bytes)
     510                 :             : {
     511                 :             :   size_t len;
     512                 :             : 
     513                 :           6 :   if (!g_size_checked_mul (&len, n_blocks, n_block_bytes))
     514                 :           4 :     return NULL;
     515                 :             : 
     516                 :           2 :   return g_try_malloc0 (len);
     517                 :             : }
     518                 :             : 
     519                 :             : /**
     520                 :             :  * g_try_realloc_n:
     521                 :             :  * @mem: (nullable): previously-allocated memory, or %NULL.
     522                 :             :  * @n_blocks: the number of blocks to allocate
     523                 :             :  * @n_block_bytes: the size of each block in bytes
     524                 :             :  * 
     525                 :             :  * This function is similar to g_try_realloc(), allocating (@n_blocks * @n_block_bytes) bytes,
     526                 :             :  * but care is taken to detect possible overflow during multiplication.
     527                 :             :  * 
     528                 :             :  * Since: 2.24
     529                 :             :  * Returns: the allocated memory, or %NULL.
     530                 :             :  */
     531                 :             : gpointer
     532                 :           6 : g_try_realloc_n (gpointer mem,
     533                 :             :                  gsize    n_blocks,
     534                 :             :                  gsize    n_block_bytes)
     535                 :             : {
     536                 :             :   size_t len;
     537                 :             : 
     538                 :           6 :   if (!g_size_checked_mul (&len, n_blocks, n_block_bytes))
     539                 :           4 :     return NULL;
     540                 :             : 
     541                 :           2 :   return g_try_realloc (mem, len);
     542                 :             : }
     543                 :             : 
     544                 :             : /**
     545                 :             :  * g_mem_is_system_malloc:
     546                 :             :  * 
     547                 :             :  * Checks whether the allocator used by g_malloc() is the system's
     548                 :             :  * malloc implementation. If it returns %TRUE memory allocated with
     549                 :             :  * malloc() can be used interchangeably with memory allocated using g_malloc().
     550                 :             :  * This function is useful for avoiding an extra copy of allocated memory returned
     551                 :             :  * by a non-GLib-based API.
     552                 :             :  *
     553                 :             :  * Returns: if %TRUE, malloc() and g_malloc() can be mixed.
     554                 :             :  *
     555                 :             :  * Deprecated: 2.46: GLib always uses the system malloc, so this function always
     556                 :             :  * returns %TRUE.
     557                 :             :  **/
     558                 :             : gboolean
     559                 :           0 : g_mem_is_system_malloc (void)
     560                 :             : {
     561                 :           0 :   return TRUE;
     562                 :             : }
     563                 :             : 
     564                 :             : /**
     565                 :             :  * g_mem_set_vtable:
     566                 :             :  * @vtable: table of memory allocation routines.
     567                 :             :  * 
     568                 :             :  * This function used to let you override the memory allocation function.
     569                 :             :  * However, its use was incompatible with the use of global constructors
     570                 :             :  * in GLib and GIO, because those use the GLib allocators before main is
     571                 :             :  * reached. Therefore this function is now deprecated and is just a stub.
     572                 :             :  *
     573                 :             :  * Deprecated: 2.46: This function now does nothing. Use other memory
     574                 :             :  * profiling tools instead
     575                 :             :  */
     576                 :             : void
     577                 :           0 : g_mem_set_vtable (GMemVTable *vtable)
     578                 :             : {
     579                 :           0 :   g_warning (G_STRLOC ": custom memory allocation vtable not supported");
     580                 :           0 : }
     581                 :             : 
     582                 :             : 
     583                 :             : /**
     584                 :             :  * glib_mem_profiler_table:
     585                 :             :  *
     586                 :             :  * Used to be a #GMemVTable containing profiling variants of the memory
     587                 :             :  * allocation functions, but this variable shouldn't be modified anymore.
     588                 :             :  *
     589                 :             :  * Deprecated: 2.46: Use other memory profiling tools instead
     590                 :             :  */
     591                 :             : GMemVTable *glib_mem_profiler_table = &glib_mem_vtable;
     592                 :             : 
     593                 :             : /**
     594                 :             :  * g_mem_profile:
     595                 :             :  *
     596                 :             :  * GLib used to support some tools for memory profiling, but this
     597                 :             :  * no longer works. There are many other useful tools for memory
     598                 :             :  * profiling these days which can be used instead.
     599                 :             :  *
     600                 :             :  * Deprecated: 2.46: Use other memory profiling tools instead
     601                 :             :  */
     602                 :             : void
     603                 :           0 : g_mem_profile (void)
     604                 :             : {
     605                 :           0 :   g_warning (G_STRLOC ": memory profiling not supported");
     606                 :           0 : }
     607                 :             : 
     608                 :             : /**
     609                 :             :  * g_aligned_alloc:
     610                 :             :  * @n_blocks: the number of blocks to allocate
     611                 :             :  * @n_block_bytes: the size of each block in bytes
     612                 :             :  * @alignment: the alignment to be enforced, which must be a positive power of 2
     613                 :             :  *   and a multiple of `sizeof(void*)`
     614                 :             :  *
     615                 :             :  * This function is similar to g_malloc(), allocating (@n_blocks * @n_block_bytes)
     616                 :             :  * bytes, but care is taken to align the allocated memory to with the given
     617                 :             :  * alignment value. Additionally, it will detect possible overflow during
     618                 :             :  * multiplication.
     619                 :             :  *
     620                 :             :  * If the allocation fails (because the system is out of memory),
     621                 :             :  * the program is terminated.
     622                 :             :  *
     623                 :             :  * Aligned memory allocations returned by this function can only be
     624                 :             :  * freed using g_aligned_free_sized() or g_aligned_free().
     625                 :             :  *
     626                 :             :  * Returns: (transfer full): the allocated memory
     627                 :             :  *
     628                 :             :  * Since: 2.72
     629                 :             :  */
     630                 :             : gpointer
     631                 :          38 : g_aligned_alloc (gsize n_blocks,
     632                 :             :                  gsize n_block_bytes,
     633                 :             :                  gsize alignment)
     634                 :             : {
     635                 :          38 :   gpointer res = NULL;
     636                 :             :   gsize real_size;
     637                 :             : 
     638                 :          38 :   if (G_UNLIKELY ((alignment == 0) || (alignment & (alignment - 1)) != 0))
     639                 :             :     {
     640                 :           0 :       g_error ("%s: alignment %"G_GSIZE_FORMAT" must be a positive power of two",
     641                 :             :                G_STRLOC, alignment);
     642                 :             :     }
     643                 :             : 
     644                 :          38 :   if (G_UNLIKELY ((alignment % sizeof (void *)) != 0))
     645                 :             :     {
     646                 :           0 :       g_error ("%s: alignment %"G_GSIZE_FORMAT" must be a multiple of %"G_GSIZE_FORMAT,
     647                 :             :                G_STRLOC, alignment, sizeof (void *));
     648                 :             :     }
     649                 :             : 
     650                 :          38 :   if (!g_size_checked_mul (&real_size, n_blocks, n_block_bytes))
     651                 :             :     {
     652                 :           0 :       g_error ("%s: overflow allocating %"G_GSIZE_FORMAT"*%"G_GSIZE_FORMAT" bytes",
     653                 :             :                G_STRLOC, n_blocks, n_block_bytes);
     654                 :             :     }
     655                 :             : 
     656                 :          38 :   if (G_UNLIKELY (real_size == 0))
     657                 :             :     {
     658                 :          18 :       TRACE (GLIB_MEM_ALLOC ((void *) NULL, real_size, 0, 0));
     659                 :          18 :       return NULL;
     660                 :             :     }
     661                 :             : 
     662                 :             :   /* We need to clear errno because posix_memalign() will use its return
     663                 :             :    * value in the same way memalign() and aligned_alloc() will set errno.
     664                 :             :    * Additionally, posix_memalign() will warn if its return value is left
     665                 :             :    * unassigned.
     666                 :             :    *
     667                 :             :    * We handle all possible return values (ENOMEM and EINVAL) with either
     668                 :             :    * precondition or postcondition checking.
     669                 :             :    */
     670                 :          20 :   errno = 0;
     671                 :             : 
     672                 :             : #if defined(HAVE_POSIX_MEMALIGN)
     673                 :          20 :   errno = posix_memalign (&res, alignment, real_size);
     674                 :             : #elif defined(HAVE_ALIGNED_ALLOC) || defined(HAVE__ALIGNED_MALLOC)
     675                 :             :   /* real_size must be a multiple of alignment */
     676                 :             :   if (real_size % alignment != 0)
     677                 :             :     {
     678                 :             :       gsize offset = real_size % alignment;
     679                 :             : 
     680                 :             :       if (G_MAXSIZE - real_size < (alignment - offset))
     681                 :             :         {
     682                 :             :           g_error ("%s: overflow allocating %"G_GSIZE_FORMAT"+%"G_GSIZE_FORMAT" bytes",
     683                 :             :                    G_STRLOC, real_size, (alignment - offset));
     684                 :             :         }
     685                 :             : 
     686                 :             :       real_size += (alignment - offset);
     687                 :             :     }
     688                 :             : 
     689                 :             :   res = aligned_alloc (alignment, real_size);
     690                 :             : #elif defined(HAVE_MEMALIGN)
     691                 :             :   res = memalign (alignment, real_size);
     692                 :             : #else
     693                 :             : # error "This platform does not have an aligned memory allocator."
     694                 :             : #endif
     695                 :             : 
     696                 :          20 :   TRACE (GLIB_MEM_ALLOC ((void *) res, real_size, 0, 0));
     697                 :          20 :   if (res)
     698                 :          20 :     return res;
     699                 :             : 
     700                 :           0 :   g_error ("%s: failed to allocate %"G_GSIZE_FORMAT" bytes",
     701                 :             :            G_STRLOC, real_size);
     702                 :             : 
     703                 :             :   return NULL;
     704                 :             : }
     705                 :             : 
     706                 :             : /**
     707                 :             :  * g_aligned_alloc0:
     708                 :             :  * @n_blocks: the number of blocks to allocate
     709                 :             :  * @n_block_bytes: the size of each block in bytes
     710                 :             :  * @alignment: the alignment to be enforced, which must be a positive power of 2
     711                 :             :  *   and a multiple of `sizeof(void*)`
     712                 :             :  *
     713                 :             :  * This function is similar to g_aligned_alloc(), but it will
     714                 :             :  * also clear the allocated memory before returning it.
     715                 :             :  *
     716                 :             :  * Returns: (transfer full): the allocated, cleared memory
     717                 :             :  *
     718                 :             :  * Since: 2.72
     719                 :             :  */
     720                 :             : gpointer
     721                 :          13 : g_aligned_alloc0 (gsize n_blocks,
     722                 :             :                   gsize n_block_bytes,
     723                 :             :                   gsize alignment)
     724                 :             : {
     725                 :          13 :   gpointer res = g_aligned_alloc (n_blocks, n_block_bytes, alignment);
     726                 :             : 
     727                 :          13 :   if (G_LIKELY (res != NULL))
     728                 :           7 :     memset (res, 0, n_blocks * n_block_bytes);
     729                 :             : 
     730                 :          13 :   return res;
     731                 :             : }
     732                 :             : 
     733                 :             : /**
     734                 :             :  * g_aligned_free:
     735                 :             :  * @mem: (nullable): the memory to deallocate
     736                 :             :  *
     737                 :             :  * Frees the memory allocated by g_aligned_alloc().
     738                 :             :  *
     739                 :             :  * Since: 2.72
     740                 :             :  */
     741                 :             : void
     742                 :          14 : g_aligned_free (gpointer mem)
     743                 :             : {
     744                 :          14 :   aligned_free (mem);
     745                 :          14 : }
     746                 :             : 
     747                 :             : /**
     748                 :             :  * g_aligned_free_sized:
     749                 :             :  * @mem: (nullable): the memory to free
     750                 :             :  * @alignment: alignment of @mem
     751                 :             :  * @size: size of @mem, in bytes
     752                 :             :  *
     753                 :             :  * Frees the memory pointed to by @mem, assuming it is has the given @size and
     754                 :             :  * @alignment.
     755                 :             :  *
     756                 :             :  * If @mem is %NULL this is a no-op (and @size is ignored).
     757                 :             :  *
     758                 :             :  * It is an error if @size doesn’t match the size, or @alignment doesn’t match
     759                 :             :  * the alignment, passed when @mem was allocated. @size and @alignment are
     760                 :             :  * passed to this function to allow optimizations in the allocator. If you
     761                 :             :  * don’t know either of them, use g_aligned_free() instead.
     762                 :             :  *
     763                 :             :  * Since: 2.76
     764                 :             :  */
     765                 :             : void
     766                 :          12 : g_aligned_free_sized (void   *mem,
     767                 :             :                       size_t  alignment,
     768                 :             :                       size_t  size)
     769                 :             : {
     770                 :             : #ifdef HAVE_FREE_ALIGNED_SIZED
     771                 :             :   free_aligned_sized (mem, alignment, size);
     772                 :             : #else
     773                 :          12 :   aligned_free (mem);
     774                 :             : #endif
     775                 :          12 : }
        

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