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/* 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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* 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 of the License, or (at your option) any later version.
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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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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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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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#include "gthreadprivate.h"
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#define MEM_PROFILE_TABLE_SIZE 4096
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* having G_DISABLE_CHECKS defined disables use of glib_mem_profiler_table and
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* REALLOC_0_WORKS is defined if g_realloc (NULL, x) works.
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* SANE_MALLOC_PROTOS is defined if the systems malloc() and friends functions
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* match the corresponding GLib prototypes, keep configure.in and gmem.h in sync here.
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* g_mem_gc_friendly is TRUE, freed memory should be 0-wiped.
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/* --- prototypes --- */
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static gboolean g_mem_initialized = FALSE;
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static void g_mem_init_nomessage (void);
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/* --- malloc wrappers --- */
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#ifndef REALLOC_0_WORKS
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standard_realloc (gpointer mem,
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return malloc (n_bytes);
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return realloc (mem, n_bytes);
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#endif /* !REALLOC_0_WORKS */
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#ifdef SANE_MALLOC_PROTOS
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# define standard_malloc malloc
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# ifdef REALLOC_0_WORKS
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# define standard_realloc realloc
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# endif /* REALLOC_0_WORKS */
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# define standard_free free
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# define standard_calloc calloc
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# define standard_try_malloc malloc
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# define standard_try_realloc realloc
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#else /* !SANE_MALLOC_PROTOS */
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standard_malloc (gsize n_bytes)
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return malloc (n_bytes);
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# ifdef REALLOC_0_WORKS
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standard_realloc (gpointer mem,
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return realloc (mem, n_bytes);
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# endif /* REALLOC_0_WORKS */
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standard_free (gpointer mem)
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standard_calloc (gsize n_blocks,
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return calloc (n_blocks, n_bytes);
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#define standard_try_malloc standard_malloc
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#define standard_try_realloc standard_realloc
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#endif /* !SANE_MALLOC_PROTOS */
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/* --- variables --- */
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static GMemVTable glib_mem_vtable = {
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standard_try_realloc,
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/* --- functions --- */
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g_malloc (gulong n_bytes)
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if (G_UNLIKELY (!g_mem_initialized))
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g_mem_init_nomessage();
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if (G_LIKELY (n_bytes))
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mem = glib_mem_vtable.malloc (n_bytes);
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g_error ("%s: failed to allocate %lu bytes", G_STRLOC, n_bytes);
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g_malloc0 (gulong n_bytes)
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if (G_UNLIKELY (!g_mem_initialized))
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g_mem_init_nomessage();
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if (G_LIKELY (n_bytes))
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mem = glib_mem_vtable.calloc (1, n_bytes);
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g_error ("%s: failed to allocate %lu bytes", G_STRLOC, n_bytes);
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g_realloc (gpointer mem,
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if (G_UNLIKELY (!g_mem_initialized))
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g_mem_init_nomessage();
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if (G_LIKELY (n_bytes))
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mem = glib_mem_vtable.realloc (mem, n_bytes);
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g_error ("%s: failed to allocate %lu bytes", G_STRLOC, n_bytes);
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glib_mem_vtable.free (mem);
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g_free (gpointer mem)
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if (G_UNLIKELY (!g_mem_initialized))
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g_mem_init_nomessage();
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glib_mem_vtable.free (mem);
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g_try_malloc (gulong n_bytes)
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if (G_UNLIKELY (!g_mem_initialized))
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g_mem_init_nomessage();
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if (G_LIKELY (n_bytes))
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return glib_mem_vtable.try_malloc (n_bytes);
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g_try_malloc0 (gulong n_bytes)
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mem = g_try_malloc (n_bytes);
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memset (mem, 0, n_bytes);
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g_try_realloc (gpointer mem,
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if (G_UNLIKELY (!g_mem_initialized))
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g_mem_init_nomessage();
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if (G_LIKELY (n_bytes))
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return glib_mem_vtable.try_realloc (mem, n_bytes);
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glib_mem_vtable.free (mem);
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fallback_calloc (gsize n_blocks,
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gsize l = n_blocks * n_block_bytes;
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gpointer mem = glib_mem_vtable.malloc (l);
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static gboolean vtable_set = FALSE;
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* g_mem_is_system_malloc
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* Checks whether the allocator used by g_malloc() is the system's
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* malloc implementation. If it returns %TRUE memory allocated with
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* malloc() can be used interchangeable with memory allocated using g_malloc().
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* This function is useful for avoiding an extra copy of allocated memory returned
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* by a non-GLib-based API.
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* A different allocator can be set using g_mem_set_vtable().
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* Return value: if %TRUE, malloc() and g_malloc() can be mixed.
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g_mem_is_system_malloc (void)
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g_mem_set_vtable (GMemVTable *vtable)
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if (vtable->malloc && vtable->realloc && vtable->free)
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glib_mem_vtable.malloc = vtable->malloc;
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glib_mem_vtable.realloc = vtable->realloc;
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glib_mem_vtable.free = vtable->free;
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glib_mem_vtable.calloc = vtable->calloc ? vtable->calloc : fallback_calloc;
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glib_mem_vtable.try_malloc = vtable->try_malloc ? vtable->try_malloc : glib_mem_vtable.malloc;
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glib_mem_vtable.try_realloc = vtable->try_realloc ? vtable->try_realloc : glib_mem_vtable.realloc;
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g_warning (G_STRLOC ": memory allocation vtable lacks one of malloc(), realloc() or free()");
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g_warning (G_STRLOC ": memory allocation vtable can only be set once at startup");
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/* --- memory profiling and checking --- */
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#ifdef G_DISABLE_CHECKS
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GMemVTable *glib_mem_profiler_table = &glib_mem_vtable;
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#else /* !G_DISABLE_CHECKS */
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static guint *profile_data = NULL;
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static gulong profile_allocs = 0;
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static gulong profile_zinit = 0;
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static gulong profile_frees = 0;
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static GMutex *gmem_profile_mutex = NULL;
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#ifdef G_ENABLE_DEBUG
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static volatile gulong g_trap_free_size = 0;
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static volatile gulong g_trap_realloc_size = 0;
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static volatile gulong g_trap_malloc_size = 0;
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#endif /* G_ENABLE_DEBUG */
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#define PROFILE_TABLE(f1,f2,f3) ( ( ((f3) << 2) | ((f2) << 1) | (f1) ) * (MEM_PROFILE_TABLE_SIZE + 1))
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profiler_log (ProfilerJob job,
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g_mutex_lock (gmem_profile_mutex);
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profile_data = standard_calloc ((MEM_PROFILE_TABLE_SIZE + 1) * 8,
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sizeof (profile_data[0]));
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if (!profile_data) /* memory system kiddin' me, eh? */
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g_mutex_unlock (gmem_profile_mutex);
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if (n_bytes < MEM_PROFILE_TABLE_SIZE)
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profile_data[n_bytes + PROFILE_TABLE ((job & PROFILER_ALLOC) != 0,
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(job & PROFILER_RELOC) != 0,
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profile_data[MEM_PROFILE_TABLE_SIZE + PROFILE_TABLE ((job & PROFILER_ALLOC) != 0,
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(job & PROFILER_RELOC) != 0,
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if (job & PROFILER_ALLOC)
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profile_allocs += n_bytes;
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if (job & PROFILER_ZINIT)
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profile_zinit += n_bytes;
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profile_frees += n_bytes;
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g_mutex_unlock (gmem_profile_mutex);
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profile_print_locked (guint *local_data,
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gboolean need_header = TRUE;
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for (i = 0; i <= MEM_PROFILE_TABLE_SIZE; i++)
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glong t_malloc = local_data[i + PROFILE_TABLE (1, 0, success)];
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glong t_realloc = local_data[i + PROFILE_TABLE (1, 1, success)];
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glong t_free = local_data[i + PROFILE_TABLE (0, 0, success)];
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glong t_refree = local_data[i + PROFILE_TABLE (0, 1, success)];
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if (!t_malloc && !t_realloc && !t_free && !t_refree)
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else if (need_header)
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g_print (" blocks of | allocated | freed | allocated | freed | n_bytes \n");
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g_print (" n_bytes | n_times by | n_times by | n_times by | n_times by | remaining \n");
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g_print (" | malloc() | free() | realloc() | realloc() | \n");
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g_print ("===========|============|============|============|============|===========\n");
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if (i < MEM_PROFILE_TABLE_SIZE)
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g_print ("%10u | %10ld | %10ld | %10ld | %10ld |%+11ld\n",
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i, t_malloc, t_free, t_realloc, t_refree,
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(t_malloc - t_free + t_realloc - t_refree) * i);
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else if (i >= MEM_PROFILE_TABLE_SIZE)
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g_print (" >%6u | %10ld | %10ld | %10ld | %10ld | ***\n",
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i, t_malloc, t_free, t_realloc, t_refree);
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g_print (" --- none ---\n");
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guint local_data[(MEM_PROFILE_TABLE_SIZE + 1) * 8 * sizeof (profile_data[0])];
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if (G_UNLIKELY (!g_mem_initialized))
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g_mem_init_nomessage();
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g_mutex_lock (gmem_profile_mutex);
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local_allocs = profile_allocs;
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local_zinit = profile_zinit;
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local_frees = profile_frees;
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g_mutex_unlock (gmem_profile_mutex);
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memcpy (local_data, profile_data,
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(MEM_PROFILE_TABLE_SIZE + 1) * 8 * sizeof (profile_data[0]));
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g_mutex_unlock (gmem_profile_mutex);
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g_print ("GLib Memory statistics (successful operations):\n");
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profile_print_locked (local_data, TRUE);
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g_print ("GLib Memory statistics (failing operations):\n");
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profile_print_locked (local_data, FALSE);
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g_print ("Total bytes: allocated=%lu, zero-initialized=%lu (%.2f%%), freed=%lu (%.2f%%), remaining=%lu\n",
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((gdouble) local_zinit) / local_allocs * 100.0,
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((gdouble) local_frees) / local_allocs * 100.0,
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local_allocs - local_frees);
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profiler_try_malloc (gsize n_bytes)
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#ifdef G_ENABLE_DEBUG
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if (g_trap_malloc_size == n_bytes)
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#endif /* G_ENABLE_DEBUG */
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p = standard_malloc (sizeof (gulong) * 2 + n_bytes);
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p[0] = 0; /* free count */
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p[1] = n_bytes; /* length */
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profiler_log (PROFILER_ALLOC, n_bytes, TRUE);
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profiler_log (PROFILER_ALLOC, n_bytes, FALSE);
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profiler_malloc (gsize n_bytes)
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gpointer mem = profiler_try_malloc (n_bytes);
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profiler_calloc (gsize n_blocks,
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gsize l = n_blocks * n_block_bytes;
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#ifdef G_ENABLE_DEBUG
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if (g_trap_malloc_size == l)
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#endif /* G_ENABLE_DEBUG */
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p = standard_calloc (1, sizeof (gulong) * 2 + l);
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p[0] = 0; /* free count */
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p[1] = l; /* length */
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profiler_log (PROFILER_ALLOC | PROFILER_ZINIT, l, TRUE);
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profiler_log (PROFILER_ALLOC | PROFILER_ZINIT, l, FALSE);
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profiler_free (gpointer mem)
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if (p[0]) /* free count */
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g_warning ("free(%p): memory has been freed %lu times already", p + 2, p[0]);
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profiler_log (PROFILER_FREE,
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#ifdef G_ENABLE_DEBUG
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if (g_trap_free_size == p[1])
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#endif /* G_ENABLE_DEBUG */
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profiler_log (PROFILER_FREE,
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memset (p + 2, 0xaa, p[1]);
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/* for all those that miss standard_free (p); in this place, yes,
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* we do leak all memory when profiling, and that is intentional
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* to catch double frees. patch submissions are futile.
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profiler_try_realloc (gpointer mem,
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#ifdef G_ENABLE_DEBUG
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if (g_trap_realloc_size == n_bytes)
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#endif /* G_ENABLE_DEBUG */
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if (mem && p[0]) /* free count */
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g_warning ("realloc(%p, %lu): memory has been freed %lu times already", p + 2, (gulong)n_bytes, p[0]);
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profiler_log (PROFILER_ALLOC | PROFILER_RELOC, n_bytes, FALSE);
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p = standard_realloc (mem ? p : NULL, sizeof (gulong) * 2 + n_bytes);
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profiler_log (PROFILER_FREE | PROFILER_RELOC, p[1], TRUE);
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profiler_log (PROFILER_ALLOC | PROFILER_RELOC, p[1], TRUE);
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profiler_log (PROFILER_ALLOC | PROFILER_RELOC, n_bytes, FALSE);
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profiler_realloc (gpointer mem,
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mem = profiler_try_realloc (mem, n_bytes);
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static GMemVTable profiler_table = {
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profiler_try_realloc,
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GMemVTable *glib_mem_profiler_table = &profiler_table;
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#endif /* !G_DISABLE_CHECKS */
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/* --- MemChunks --- */
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#ifndef G_ALLOC_AND_FREE
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typedef struct _GAllocator GAllocator;
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typedef struct _GMemChunk GMemChunk;
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#define G_ALLOC_ONLY 1
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#define G_ALLOC_AND_FREE 2
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guint alloc_size; /* the size of an atom */
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g_mem_chunk_new (const gchar *name,
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GMemChunk *mem_chunk;
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g_return_val_if_fail (atom_size > 0, NULL);
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mem_chunk = g_slice_new (GMemChunk);
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mem_chunk->alloc_size = atom_size;
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g_mem_chunk_destroy (GMemChunk *mem_chunk)
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g_return_if_fail (mem_chunk != NULL);
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g_slice_free (GMemChunk, mem_chunk);
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g_mem_chunk_alloc (GMemChunk *mem_chunk)
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g_return_val_if_fail (mem_chunk != NULL, NULL);
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return g_slice_alloc (mem_chunk->alloc_size);
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g_mem_chunk_alloc0 (GMemChunk *mem_chunk)
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g_return_val_if_fail (mem_chunk != NULL, NULL);
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return g_slice_alloc0 (mem_chunk->alloc_size);
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g_mem_chunk_free (GMemChunk *mem_chunk,
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g_return_if_fail (mem_chunk != NULL);
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g_slice_free1 (mem_chunk->alloc_size, mem);
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void g_mem_chunk_clean (GMemChunk *mem_chunk) {}
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void g_mem_chunk_reset (GMemChunk *mem_chunk) {}
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void g_mem_chunk_print (GMemChunk *mem_chunk) {}
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void g_mem_chunk_info (void) {}
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void g_blow_chunks (void) {}
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g_allocator_new (const gchar *name,
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static struct _GAllocator {
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GMemChunk *mem_chunk;
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"GAllocator is deprecated", 1, TRUE, 0, NULL, NULL, NULL,
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/* some (broken) GAllocator uses depend on non-NULL allocators */
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return (void*) &dummy;
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g_allocator_free (GAllocator *allocator)
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#ifdef ENABLE_GC_FRIENDLY_DEFAULT
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gboolean g_mem_gc_friendly = TRUE;
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gboolean g_mem_gc_friendly = FALSE;
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g_mem_init_nomessage (void)
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static const GDebugKey keys[] = {
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{ "gc-friendly", 1 },
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if (g_mem_initialized)
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/* don't use g_malloc/g_message here */
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val = _g_getenv_nomalloc ("G_DEBUG", buffer);
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flags = !val ? 0 : g_parse_debug_string (val, keys, G_N_ELEMENTS (keys));
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if (flags & 1) /* gc-friendly */
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g_mem_gc_friendly = TRUE;
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g_mem_initialized = TRUE;
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_g_mem_thread_init_noprivate_nomessage (void)
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/* we may only create mutexes here, locking/
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* unlocking a mutex does not yet work.
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g_mem_init_nomessage();
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#ifndef G_DISABLE_CHECKS
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gmem_profile_mutex = g_mutex_new ();
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#include "galiasdef.c"