gmem.c

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/* 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
 * GLib at ftp://ftp.gtk.org/pub/gtk/. 
 */

/* 
 * MT safe
 */

#ifdef HAVE_CONFIG_H
#include "glibconfig.h"
#endif

#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include "glib.h"


/* notes on macros:
 * having DISABLE_MEM_POOLS defined, disables mem_chunks alltogether, their
 * allocations are performed through ordinary g_malloc/g_free.
 * having G_DISABLE_CHECKS defined disables use of glib_mem_profiler_table and
 * g_mem_profile().
 * REALLOC_0_WORKS is defined if g_realloc (NULL, x) works.
 * SANE_MALLOC_PROTOS is defined if the systems malloc() and friends functions
 * match the corresponding GLib prototypes, keep configure.in and gmem.h in sync here.
 * if ENABLE_GC_FRIENDLY is defined, freed memory should be 0-wiped.
 */

#define MEM_PROFILE_TABLE_SIZE 4096

#define MEM_AREA_SIZE 4L

#ifdef	G_DISABLE_CHECKS
#  define ENTER_MEM_CHUNK_ROUTINE()
#  define LEAVE_MEM_CHUNK_ROUTINE()
#  define IN_MEM_CHUNK_ROUTINE()	FALSE
#else	/* !G_DISABLE_CHECKS */
static GPrivate* mem_chunk_recursion = NULL;
#  define MEM_CHUNK_ROUTINE_COUNT()	GPOINTER_TO_UINT (g_private_get (mem_chunk_recursion))
#  define ENTER_MEM_CHUNK_ROUTINE()	g_private_set (mem_chunk_recursion, GUINT_TO_POINTER (MEM_CHUNK_ROUTINE_COUNT () + 1))
#  define LEAVE_MEM_CHUNK_ROUTINE()	g_private_set (mem_chunk_recursion, GUINT_TO_POINTER (MEM_CHUNK_ROUTINE_COUNT () - 1))
#endif	/* !G_DISABLE_CHECKS */

#ifndef	REALLOC_0_WORKS
static gpointer
standard_realloc (gpointer mem,
		  gsize    n_bytes)
{
  if (!mem)
    return malloc (n_bytes);
  else
    return realloc (mem, n_bytes);
}
#endif	/* !REALLOC_0_WORKS */

#ifdef SANE_MALLOC_PROTOS
#  define standard_malloc	malloc
#  ifdef REALLOC_0_WORKS
#    define standard_realloc	realloc
#  endif /* REALLOC_0_WORKS */
#  define standard_free		free
#  define standard_calloc	calloc
#  define standard_try_malloc	malloc
#  define standard_try_realloc	realloc
#else	/* !SANE_MALLOC_PROTOS */
static gpointer
standard_malloc (gsize n_bytes)
{
  return malloc (n_bytes);
}
#  ifdef REALLOC_0_WORKS
static gpointer
standard_realloc (gpointer mem,
		  gsize    n_bytes)
{
  return realloc (mem, n_bytes);
}
#  endif /* REALLOC_0_WORKS */
static void
standard_free (gpointer mem)
{
  free (mem);
}
static gpointer
standard_calloc (gsize n_blocks,
		 gsize n_bytes)
{
  return calloc (n_blocks, n_bytes);
}
#define	standard_try_malloc	standard_malloc
#define	standard_try_realloc	standard_realloc
#endif	/* !SANE_MALLOC_PROTOS */


/* --- variables --- */
static GMemVTable glib_mem_vtable = {
  standard_malloc,
  standard_realloc,
  standard_free,
  standard_calloc,
  standard_try_malloc,
  standard_try_realloc,
};


/* --- functions --- */
gpointer
g_malloc (gulong n_bytes)
{
  if (n_bytes)
    {
      gpointer mem;

      mem = glib_mem_vtable.malloc (n_bytes);
      if (mem)
	return mem;

      g_error ("%s: failed to allocate %lu bytes", G_STRLOC, n_bytes);
    }

  return NULL;
}

gpointer
g_malloc0 (gulong n_bytes)
{
  if (n_bytes)
    {
      gpointer mem;

      mem = glib_mem_vtable.calloc (1, n_bytes);
      if (mem)
	return mem;

      g_error ("%s: failed to allocate %lu bytes", G_STRLOC, n_bytes);
    }

  return NULL;
}

gpointer
g_realloc (gpointer mem,
	   gulong   n_bytes)
{
  if (n_bytes)
    {
      mem = glib_mem_vtable.realloc (mem, n_bytes);
      if (mem)
	return mem;

      g_error ("%s: failed to allocate %lu bytes", G_STRLOC, n_bytes);
    }

  if (mem)
    glib_mem_vtable.free (mem);

  return NULL;
}

void
g_free (gpointer mem)
{
  if (mem)
    glib_mem_vtable.free (mem);
}

gpointer
g_try_malloc (gulong n_bytes)
{
  if (n_bytes)
    return glib_mem_vtable.try_malloc (n_bytes);
  else
    return NULL;
}

gpointer
g_try_realloc (gpointer mem,
	       gulong   n_bytes)
{
  if (n_bytes)
    return glib_mem_vtable.try_realloc (mem, n_bytes);

  if (mem)
    glib_mem_vtable.free (mem);

  return NULL;
}

static gpointer
fallback_calloc (gsize n_blocks,
		 gsize n_block_bytes)
{
  gsize l = n_blocks * n_block_bytes;
  gpointer mem = glib_mem_vtable.malloc (l);

  if (mem)
    memset (mem, 0, l);

  return mem;
}

static gboolean vtable_set = FALSE;

/**
 * g_mem_is_system_malloc
 * 
 * Checks whether the allocator used by g_malloc() is the system's
 * malloc implementation. If it returns %TRUE memory allocated with
 * <function>malloc()</function> can be used interchangeable with 
 * memory allocated using g_malloc(). This function is useful for 
 * avoiding an extra copy of allocated memory returned by a 
 * non-GLib-based API.
 *
 * A different allocator can be set using g_mem_set_vtable().
 *
 * Return value: if %TRUE, <function>malloc()</function> and g_malloc() can be mixed.
 **/
gboolean
g_mem_is_system_malloc (void)
{
  return !vtable_set;
}

void
g_mem_set_vtable (GMemVTable *vtable)
{
  if (!vtable_set)
    {
      vtable_set = TRUE;
      if (vtable->malloc && vtable->realloc && vtable->free)
	{
	  glib_mem_vtable.malloc = vtable->malloc;
	  glib_mem_vtable.realloc = vtable->realloc;
	  glib_mem_vtable.free = vtable->free;
	  glib_mem_vtable.calloc = vtable->calloc ? vtable->calloc : fallback_calloc;
	  glib_mem_vtable.try_malloc = vtable->try_malloc ? vtable->try_malloc : glib_mem_vtable.malloc;
	  glib_mem_vtable.try_realloc = vtable->try_realloc ? vtable->try_realloc : glib_mem_vtable.realloc;
	}
      else
	g_warning (G_STRLOC ": memory allocation vtable lacks one of malloc(), realloc() or free()");
    }
  else
    g_warning (G_STRLOC ": memory allocation vtable can only be set once at startup");
}


/* --- memory profiling and checking --- */
#ifdef	G_DISABLE_CHECKS
GMemVTable *glib_mem_profiler_table = &glib_mem_vtable;
void
g_mem_profile (void)
{
}
#else	/* !G_DISABLE_CHECKS */
typedef enum {
  PROFILER_FREE		= 0,
  PROFILER_ALLOC	= 1,
  PROFILER_RELOC	= 2,
  PROFILER_ZINIT	= 4
} ProfilerJob;
static guint *profile_data = NULL;
static gulong profile_allocs = 0;
static gulong profile_mc_allocs = 0;
static gulong profile_zinit = 0;
static gulong profile_frees = 0;
static gulong profile_mc_frees = 0;
static GMutex *g_profile_mutex = NULL;
#ifdef  G_ENABLE_DEBUG
static volatile gulong g_trap_free_size = 0;
static volatile gulong g_trap_realloc_size = 0;
static volatile gulong g_trap_malloc_size = 0;
#endif  /* G_ENABLE_DEBUG */

#define	PROFILE_TABLE(f1,f2,f3)   ( ( ((f3) << 2) | ((f2) << 1) | (f1) ) * (MEM_PROFILE_TABLE_SIZE + 1))

static void
profiler_log (ProfilerJob job,
	      gulong      n_bytes,
	      gboolean    success)
{
  g_mutex_lock (g_profile_mutex);
  if (!profile_data)
    {
      profile_data = standard_malloc ((MEM_PROFILE_TABLE_SIZE + 1) * 8 * sizeof (profile_data[0]));
      if (!profile_data)	/* memory system kiddin' me, eh? */
	{
	  g_mutex_unlock (g_profile_mutex);
	  return;
	}
    }

  if (MEM_CHUNK_ROUTINE_COUNT () == 0)
    {
      if (n_bytes < MEM_PROFILE_TABLE_SIZE)
	profile_data[n_bytes + PROFILE_TABLE ((job & PROFILER_ALLOC) != 0,
					      (job & PROFILER_RELOC) != 0,
					      success != 0)] += 1;
      else
	profile_data[MEM_PROFILE_TABLE_SIZE + PROFILE_TABLE ((job & PROFILER_ALLOC) != 0,
							     (job & PROFILER_RELOC) != 0,
							     success != 0)] += 1;
      if (success)
	{
	  if (job & PROFILER_ALLOC)
	    {
	      profile_allocs += n_bytes;
	      if (job & PROFILER_ZINIT)
		profile_zinit += n_bytes;
	    }
	  else
	    profile_frees += n_bytes;
	}
    }
  else if (success)
    {
      if (job & PROFILER_ALLOC)
	profile_mc_allocs += n_bytes;
      else
	profile_mc_frees += n_bytes;
    }
  g_mutex_unlock (g_profile_mutex);
}

static void
profile_print_locked (guint   *local_data,
		      gboolean success)
{
  gboolean need_header = TRUE;
  guint i;

  for (i = 0; i <= MEM_PROFILE_TABLE_SIZE; i++)
    {
      glong t_malloc = local_data[i + PROFILE_TABLE (1, 0, success)];
      glong t_realloc = local_data[i + PROFILE_TABLE (1, 1, success)];
      glong t_free = local_data[i + PROFILE_TABLE (0, 0, success)];
      glong t_refree = local_data[i + PROFILE_TABLE (0, 1, success)];
      
      if (!t_malloc && !t_realloc && !t_free && !t_refree)
	continue;
      else if (need_header)
	{
	  need_header = FALSE;
	  g_print (" blocks of | allocated  | freed      | allocated  | freed      | n_bytes   \n");
	  g_print ("  n_bytes  | n_times by | n_times by | n_times by | n_times by | remaining \n");
	  g_print ("           | malloc()   | free()     | realloc()  | realloc()  |           \n");
	  g_print ("===========|============|============|============|============|===========\n");
	}
      if (i < MEM_PROFILE_TABLE_SIZE)
	g_print ("%10u | %10ld | %10ld | %10ld | %10ld |%+11ld\n",
		 i, t_malloc, t_free, t_realloc, t_refree,
		 (t_malloc - t_free + t_realloc - t_refree) * i);
      else if (i >= MEM_PROFILE_TABLE_SIZE)
	g_print ("   >%6u | %10ld | %10ld | %10ld | %10ld |        ***\n",
		 i, t_malloc, t_free, t_realloc, t_refree);
    }
  if (need_header)
    g_print (" --- none ---\n");
}

void
g_mem_profile (void)
{
  guint local_data[(MEM_PROFILE_TABLE_SIZE + 1) * 8 * sizeof (profile_data[0])];
  gulong local_allocs;
  gulong local_zinit;
  gulong local_frees;
  gulong local_mc_allocs;
  gulong local_mc_frees;

  g_mutex_lock (g_profile_mutex);

  local_allocs = profile_allocs;
  local_zinit = profile_zinit;
  local_frees = profile_frees;
  local_mc_allocs = profile_mc_allocs;
  local_mc_frees = profile_mc_frees;

  if (!profile_data)
    {
      g_mutex_unlock (g_profile_mutex);
      return;
    }

  memcpy (local_data, profile_data, 
	  (MEM_PROFILE_TABLE_SIZE + 1) * 8 * sizeof (profile_data[0]));
  
  g_mutex_unlock (g_profile_mutex);

  g_print ("GLib Memory statistics (successful operations):\n");
  profile_print_locked (local_data, TRUE);
  g_print ("GLib Memory statistics (failing operations):\n");
  profile_print_locked (local_data, FALSE);
  g_print ("Total bytes: allocated=%lu, zero-initialized=%lu (%.2f%%), freed=%lu (%.2f%%), remaining=%lu\n",
	   local_allocs,
	   local_zinit,
	   ((gdouble) local_zinit) / local_allocs * 100.0,
	   local_frees,
	   ((gdouble) local_frees) / local_allocs * 100.0,
	   local_allocs - local_frees);
  g_print ("MemChunk bytes: allocated=%lu, freed=%lu (%.2f%%), remaining=%lu\n",