/* 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

 */

#include "config.h"

#include "gmem.h"

#include <stdlib.h>

#include <string.h>

#include <signal.h>

#include "glib-init.h"

#include "gslice.h"

#include "gbacktrace.h"

#include "gtestutils.h"

#include "gthread.h"

#include "glib_trace.h"

#define MEM_PROFILE_TABLE_SIZE 4096

/* notes on macros:

 * 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.ac and gmem.h in sync here.

 * g_mem_gc_friendly is TRUE, freed memory should be 0-wiped.

 */

/* --- malloc wrappers --- */

#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,

};

/**

 * SECTION:memory

 * @Short_Description: general memory-handling

 * @Title: Memory Allocation

 * 

 * These functions provide support for allocating and freeing memory.

 * 

 * <note>

 * If any call to allocate memory fails, the application is terminated.

 * This also means that there is no need to check if the call succeeded.

 * </note>

 * 

 * <note>

 * It's important to match g_malloc() with g_free(), plain malloc() with free(),

 * and (if you're using C++) new with delete and new[] with delete[]. Otherwise

 * bad things can happen, since these allocators may use different memory

 * pools (and new/delete call constructors and destructors). See also

 * g_mem_set_vtable().

 * </note>

 */

/* --- functions --- */

/**

 * g_malloc:

 * @n_bytes: the number of bytes to allocate

 * 

 * Allocates @n_bytes bytes of memory.

 * If @n_bytes is 0 it returns %NULL.

 * 

 * Returns: a pointer to the allocated memory

 */

gpointer

g_malloc (gsize n_bytes)

{

  if (G_LIKELY (n_bytes))

    {

      gpointer mem;

      mem = glib_mem_vtable.malloc (n_bytes);

      TRACE (GLIB_MEM_ALLOC((void*) mem, (unsigned int) n_bytes, 0, 0));

      if (mem)

	return mem;

      g_error ("%s: failed to allocate %"G_GSIZE_FORMAT" bytes",

               G_STRLOC, n_bytes);

    }

  TRACE(GLIB_MEM_ALLOC((void*) NULL, (int) n_bytes, 0, 0));

  return NULL;

}

/**

 * g_malloc0:

 * @n_bytes: the number of bytes to allocate

 * 

 * Allocates @n_bytes bytes of memory, initialized to 0's.

 * If @n_bytes is 0 it returns %NULL.

 * 

 * Returns: a pointer to the allocated memory

 */

gpointer

g_malloc0 (gsize n_bytes)

{

  if (G_LIKELY (n_bytes))

    {

      gpointer mem;

      mem = glib_mem_vtable.calloc (1, n_bytes);

      TRACE (GLIB_MEM_ALLOC((void*) mem, (unsigned int) n_bytes, 1, 0));

      if (mem)

	return mem;

      g_error ("%s: failed to allocate %"G_GSIZE_FORMAT" bytes",

               G_STRLOC, n_bytes);

    }

  TRACE(GLIB_MEM_ALLOC((void*) NULL, (int) n_bytes, 1, 0));

  return NULL;

}

/**

 * g_realloc:

 * @mem: the memory to reallocate

 * @n_bytes: new size of the memory in bytes

 * 

 * Reallocates the memory pointed to by @mem, so that it now has space for

 * @n_bytes bytes of memory. It returns the new address of the memory, which may

 * have been moved. @mem may be %NULL, in which case it's considered to

 * have zero-length. @n_bytes may be 0, in which case %NULL will be returned

 * and @mem will be freed unless it is %NULL.

 * 

 * Returns: the new address of the allocated memory

 */

gpointer

g_realloc (gpointer mem,

	   gsize    n_bytes)

{

  gpointer newmem;

  if (G_LIKELY (n_bytes))

    {

      newmem = glib_mem_vtable.realloc (mem, n_bytes);

      TRACE (GLIB_MEM_REALLOC((void*) newmem, (void*)mem, (unsigned int) n_bytes, 0));

      if (newmem)

	return newmem;

      g_error ("%s: failed to allocate %"G_GSIZE_FORMAT" bytes",

               G_STRLOC, n_bytes);

    }

  if (mem)

    glib_mem_vtable.free (mem);

  TRACE (GLIB_MEM_REALLOC((void*) NULL, (void*)mem, 0, 0));

  return NULL;

}

/**

 * g_free:

 * @mem: the memory to free

 * 

 * Frees the memory pointed to by @mem.

 * If @mem is %NULL it simply returns.

 */

void

g_free (gpointer mem)

{

  if (G_LIKELY (mem))

    glib_mem_vtable.free (mem);

  TRACE(GLIB_MEM_FREE((void*) mem));

}

/**

 * g_try_malloc:

 * @n_bytes: number of bytes to allocate.

 * 

 * Attempts to allocate @n_bytes, and returns %NULL on failure.

 * Contrast with g_malloc(), which aborts the program on failure.

 * 

 * Returns: the allocated memory, or %NULL.

 */

gpointer

g_try_malloc (gsize n_bytes)

{

  gpointer mem;

  if (G_LIKELY (n_bytes))

    mem = glib_mem_vtable.try_malloc (n_bytes);

  else

    mem = NULL;

  TRACE (GLIB_MEM_ALLOC((void*) mem, (unsigned int) n_bytes, 0, 1));

  return mem;

}

/**

 * g_try_malloc0:

 * @n_bytes: number of bytes to allocate

 * 

 * Attempts to allocate @n_bytes, initialized to 0's, and returns %NULL on

 * failure. Contrast with g_malloc0(), which aborts the program on failure.

 * 

 * Since: 2.8

 * Returns: the allocated memory, or %NULL

 */

gpointer

g_try_malloc0 (gsize n_bytes)

{

  gpointer mem;

  if (G_LIKELY (n_bytes))

    mem = glib_mem_vtable.try_malloc (n_bytes);

  else

    mem = NULL;

  if (mem)

    memset (mem, 0, n_bytes);

  return mem;

}

/**

 * g_try_realloc:

 * @mem: (allow-none): previously-allocated memory, or %NULL.

 * @n_bytes: number of bytes to allocate.

 * 

 * Attempts to realloc @mem to a new size, @n_bytes, and returns %NULL

 * on failure. Contrast with g_realloc(), which aborts the program

 * on failure. If @mem is %NULL, behaves the same as g_try_malloc().

 * 

 * Returns: the allocated memory, or %NULL.

 */

gpointer

g_try_realloc (gpointer mem,

	       gsize    n_bytes)

{

  gpointer newmem;

  if (G_LIKELY (n_bytes))

    newmem = glib_mem_vtable.try_realloc (mem, n_bytes);

  else

    {

      newmem = NULL;

      if (mem)

	glib_mem_vtable.free (mem);

    }

  TRACE (GLIB_MEM_REALLOC((void*) newmem, (void*)mem, (unsigned int) n_bytes, 1));

  return newmem;

}

#define SIZE_OVERFLOWS(a,b) (G_UNLIKELY ((b) > 0 && (a) > G_MAXSIZE / (b)))

/**

 * g_malloc_n:

 * @n_blocks: the number of blocks to allocate

 * @n_block_bytes: the size of each block in bytes

 * 

 * This function is similar to g_malloc(), allocating (@n_blocks * @n_block_bytes) bytes,

 * but care is taken to detect possible overflow during multiplication.

 * 

 * Since: 2.24

 * Returns: a pointer to the allocated memory

 */

gpointer

g_malloc_n (gsize n_blocks,

	    gsize n_block_bytes)

{

  if (SIZE_OVERFLOWS (n_blocks, n_block_bytes))

    {

      g_error ("%s: overflow allocating %"G_GSIZE_FORMAT"*%"G_GSIZE_FORMAT" bytes",

               G_STRLOC, n_blocks, n_block_bytes);

    }

  return g_malloc (n_blocks * n_block_bytes);

}

/**

 * g_malloc0_n:

 * @n_blocks: the number of blocks to allocate

 * @n_block_bytes: the size of each block in bytes

 * 

 * This function is similar to g_malloc0(), allocating (@n_blocks * @n_block_bytes) bytes,

 * but care is taken to detect possible overflow during multiplication.

 * 

 * Since: 2.24

 * Returns: a pointer to the allocated memory

 */

gpointer

g_malloc0_n (gsize n_blocks,

	     gsize n_block_bytes)

{

  if (SIZE_OVERFLOWS (n_blocks, n_block_bytes))

    {

      g_error ("%s: overflow allocating %"G_GSIZE_FORMAT"*%"G_GSIZE_FORMAT" bytes",

               G_STRLOC, n_blocks, n_block_bytes);

    }

  return g_malloc0 (n_blocks * n_block_bytes);

}

/**

 * g_realloc_n:

 * @mem: the memory to reallocate

 * @n_blocks: the number of blocks to allocate

 * @n_block_bytes: the size of each block in bytes

 * 

 * This function is similar to g_realloc(), allocating (@n_blocks * @n_block_bytes) bytes,

 * but care is taken to detect possible overflow during multiplication.

 * 

 * Since: 2.24

 * Returns: the new address of the allocated memory

 */

gpointer

g_realloc_n (gpointer mem,

	     gsize    n_blocks,

	     gsize    n_block_bytes)

{

  if (SIZE_OVERFLOWS (n_blocks, n_block_bytes))

    {

      g_error ("%s: overflow allocating %"G_GSIZE_FORMAT"*%"G_GSIZE_FORMAT" bytes",

               G_STRLOC, n_blocks, n_block_bytes);

    }

  return g_realloc (mem, n_blocks * n_block_bytes);

}

/**

 * g_try_malloc_n:

 * @n_blocks: the number of blocks to allocate

 * @n_block_bytes: the size of each block in bytes

 * 

 * This function is similar to g_try_malloc(), allocating (@n_blocks * @n_block_bytes) bytes,

 * but care is taken to detect possible overflow during multiplication.

 * 

 * Since: 2.24

 * Returns: the allocated memory, or %NULL.

 */

gpointer

g_try_malloc_n (gsize n_blocks,

		gsize n_block_bytes)

{

  if (SIZE_OVERFLOWS (n_blocks, n_block_bytes))

    return NULL;

  return g_try_malloc (n_blocks * n_block_bytes);

}

/**

 * g_try_malloc0_n:

 * @n_blocks: the number of blocks to allocate

 * @n_block_bytes: the size of each block in bytes

 * 

 * This function is similar to g_try_malloc0(), allocating (@n_blocks * @n_block_bytes) bytes,

 * but care is taken to detect possible overflow during multiplication.

 * 

 * Since: 2.24

 * Returns: the allocated memory, or %NULL

 */

gpointer

g_try_malloc0_n (gsize n_blocks,

		 gsize n_block_bytes)

{

  if (SIZE_OVERFLOWS (n_blocks, n_block_bytes))

    return NULL;

  return g_try_malloc0 (n_blocks * n_block_bytes);

}

/**

 * g_try_realloc_n:

 * @mem: (allow-none): previously-allocated memory, or %NULL.

 * @n_blocks: the number of blocks to allocate

 * @n_block_bytes: the size of each block in bytes

 * 

 * This function is similar to g_try_realloc(), allocating (@n_blocks * @n_block_bytes) bytes,

 * but care is taken to detect possible overflow during multiplication.

 * 

 * Since: 2.24

 * Returns: the allocated memory, or %NULL.

 */

gpointer

g_try_realloc_n (gpointer mem,

		 gsize    n_blocks,

		 gsize    n_block_bytes)

{

  if (SIZE_OVERFLOWS (n_blocks, n_block_bytes))

    return NULL;

  return g_try_realloc (mem, n_blocks * n_block_bytes);

}

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

 * malloc() 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, malloc() and g_malloc() can be mixed.

 **/

gboolean

g_mem_is_system_malloc (void)

{

  return !vtable_set;

}

/**

 * g_mem_set_vtable:

 * @vtable: table of memory allocation routines.

 * 

 * Sets the #GMemVTable to use for memory allocation. You can use this to provide

 * custom memory allocation routines. <emphasis>This function must be called

 * before using any other GLib functions.</emphasis> The @vtable only needs to

 * provide malloc(), realloc(), and free() functions; GLib can provide default

 * implementations of the others. The malloc() and realloc() implementations

 * should return %NULL on failure, GLib will handle error-checking for you.

 * @vtable is copied, so need not persist after this function has been called.

 */

void

g_mem_set_vtable (GMemVTable *vtable)

{

  if (!vtable_set)

    {

      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;

	  vtable_set = TRUE;

	}

      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

/**

 * glib_mem_profiler_table:

 * 

 * A #GMemVTable containing profiling variants of the memory

 * allocation functions. Use them together with g_mem_profile()

 * in order to get information about the memory allocation pattern

 * of your program.

 */

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 gsize profile_allocs = 0;

static gsize profile_zinit = 0;

static gsize profile_frees = 0;

static GMutex gmem_profile_mutex;

#ifdef  G_ENABLE_DEBUG

static volatile gsize g_trap_free_size = 0;

static volatile gsize g_trap_realloc_size = 0;

static volatile gsize 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,

	      gsize       n_bytes,

	      gboolean    success)

{

  g_mutex_lock (&gmem_profile_mutex);

  if (!profile_data)

    {

      profile_data = standard_calloc ((MEM_PROFILE_TABLE_SIZE + 1) * 8, 

                                      sizeof (profile_data[0]));

      if (!profile_data)	/* memory system kiddin' me, eh? */

	{

	  g_mutex_unlock (&gmem_profile_mutex);

	  return;

	}

    }

  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;

    }

  g_mutex_unlock (&gmem_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");

}

/**

 * g_mem_profile:

 * 

 * Outputs a summary of memory usage.

 * 

 * It outputs the frequency of allocations of different sizes,

 * the total number of bytes which have been allocated,

 * the total number of bytes which have been freed,

 * and the difference between the previous two values, i.e. the number of bytes

 * still in use.

 * 

 * Note that this function will not output anything unless you have

 * previously installed the #glib_mem_profiler_table with g_mem_set_vtable().

 */

void

g_mem_profile (void)

{

  guint local_data[(MEM_PROFILE_TABLE_SIZE + 1) * 8 * sizeof (profile_data[0])];

  gsize local_allocs;

  gsize local_zinit;

  gsize local_frees;

  g_mutex_lock (&gmem_profile_mutex);

  local_allocs = profile_allocs;

  local_zinit = profile_zinit;

  local_frees = profile_frees;

  if (!profile_data)

    {

      g_mutex_unlock (&gmem_profile_mutex);

      return;

    }

  memcpy (local_data, profile_data, 

	  (MEM_PROFILE_TABLE_SIZE + 1) * 8 * sizeof (profile_data[0]));

  g_mutex_unlock (&gmem_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=%"G_GSIZE_FORMAT", "

           "zero-initialized=%"G_GSIZE_FORMAT" (%.2f%%), "

           "freed=%"G_GSIZE_FORMAT" (%.2f%%), "

           "remaining=%"G_GSIZE_FORMAT"\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);

}

static gpointer

profiler_try_malloc (gsize n_bytes)

{

  gsize *p;

#ifdef  G_ENABLE_DEBUG

  if (g_trap_malloc_size == n_bytes)

    G_BREAKPOINT ();

#endif  /* G_ENABLE_DEBUG */

  p = standard_malloc (sizeof (gsize) * 2 + n_bytes);

  if (p)

    {

      p[0] = 0;		/* free count */

      p[1] = n_bytes;	/* length */

      profiler_log (PROFILER_ALLOC, n_bytes, TRUE);

      p += 2;

    }

  else

    profiler_log (PROFILER_ALLOC, n_bytes, FALSE);

  return p;

}

static gpointer

profiler_malloc (gsize n_bytes)

{

  gpointer mem = profiler_try_malloc (n_bytes);

  if (!mem)

    g_mem_profile ();

  return mem;

}

static gpointer

profiler_calloc (gsize n_blocks,

		 gsize n_block_bytes)

{

  gsize l = n_blocks * n_block_bytes;

  gsize *p;

#ifdef  G_ENABLE_DEBUG

  if (g_trap_malloc_size == l)

    G_BREAKPOINT ();

#endif  /* G_ENABLE_DEBUG */

  p = standard_calloc (1, sizeof (gsize) * 2 + l);

  if (p)

    {

      p[0] = 0;		/* free count */

      p[1] = l;		/* length */

      profiler_log (PROFILER_ALLOC | PROFILER_ZINIT, l, TRUE);

      p += 2;

    }

  else

    {

      profiler_log (PROFILER_ALLOC | PROFILER_ZINIT, l, FALSE);

      g_mem_profile ();

    }

  return p;

}

static void

profiler_free (gpointer mem)

{

  gsize *p = mem;

  p -= 2;

  if (p[0])	/* free count */

    {

      g_warning ("free(%p): memory has been freed %"G_GSIZE_FORMAT" times already",

                 p + 2, p[0]);

      profiler_log (PROFILER_FREE,

		    p[1],	/* length */

		    FALSE);

    }

  else

    {

#ifdef  G_ENABLE_DEBUG

      if (g_trap_free_size == p[1])

	G_BREAKPOINT ();

#endif  /* G_ENABLE_DEBUG */

      profiler_log (PROFILER_FREE,

		    p[1],	/* length */

		    TRUE);

      memset (p + 2, 0xaa, p[1]);

      /* for all those that miss standard_free (p); in this place, yes,

       * we do leak all memory when profiling, and that is intentional

       * to catch double frees. patch submissions are futile.

       */

    }

  p[0] += 1;

}

static gpointer

profiler_try_realloc (gpointer mem,

		      gsize    n_bytes)

{

  gsize *p = mem;

  p -= 2;

#ifdef  G_ENABLE_DEBUG

  if (g_trap_realloc_size == n_bytes)

    G_BREAKPOINT ();

#endif  /* G_ENABLE_DEBUG */

  if (mem && p[0])	/* free count */

    {

      g_warning ("realloc(%p, %"G_GSIZE_FORMAT"): "

                 "memory has been freed %"G_GSIZE_FORMAT" times already",

                 p + 2, (gsize) n_bytes, p[0]);

      profiler_log (PROFILER_ALLOC | PROFILER_RELOC, n_bytes, FALSE);

      return NULL;

    }

  else

    {

      p = standard_realloc (mem ? p : NULL, sizeof (gsize) * 2 + n_bytes);

      if (p)

	{

	  if (mem)

	    profiler_log (PROFILER_FREE | PROFILER_RELOC, p[1], TRUE);

	  p[0] = 0;

	  p[1] = n_bytes;

	  profiler_log (PROFILER_ALLOC | PROFILER_RELOC, p[1], TRUE);

	  p += 2;

	}

      else

	profiler_log (PROFILER_ALLOC | PROFILER_RELOC, n_bytes, FALSE);

      return p;

    }

}

static gpointer

profiler_realloc (gpointer mem,

		  gsize    n_bytes)

{

  mem = profiler_try_realloc (mem, n_bytes);

  if (!mem)

    g_mem_profile ();

  return mem;

}

static GMemVTable profiler_table = {

  profiler_malloc,

  profiler_realloc,

  profiler_free,

  profiler_calloc,

  profiler_try_malloc,

  profiler_try_realloc,

};

GMemVTable *glib_mem_profiler_table = &profiler_table;

#endif	/* !G_DISABLE_CHECKS */