glib/gobject/gobject.c

/* GObject - GLib Type, Object, Parameter and Signal Library
 * Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
 *
 * 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.
 */
#include	"gobject.h"

/*
 * MT safe
 */

#include	"gvaluecollector.h"
#include	"gsignal.h"
#include	"gparamspecs.h"
#include	"gvaluetypes.h"
#include	"gobjectnotifyqueue.c"
#include	<string.h>
#include	<signal.h>


#define	PREALLOC_CPARAMS	(8)


/* --- macros --- */
#define PARAM_SPEC_PARAM_ID(pspec)		((pspec)->param_id)
#define	PARAM_SPEC_SET_PARAM_ID(pspec, id)	((pspec)->param_id = (id))


/* --- signals --- */
enum {
  NOTIFY,
  LAST_SIGNAL
};


/* --- properties --- */
enum {
  PROP_NONE
};


/* --- prototypes --- */
static void	g_object_base_class_init		(GObjectClass	*class);
static void	g_object_base_class_finalize		(GObjectClass	*class);
static void	g_object_do_class_init			(GObjectClass	*class);
static void	g_object_init				(GObject	*object);
static GObject*	g_object_constructor			(GType                  type,
							 guint                  n_construct_properties,
							 GObjectConstructParam *construct_params);
static void	g_object_last_unref			(GObject	*object);
static void	g_object_real_dispose			(GObject	*object);
static void	g_object_finalize			(GObject	*object);
static void	g_object_do_set_property		(GObject        *object,
							 guint           property_id,
							 const GValue   *value,
							 GParamSpec     *pspec);
static void	g_object_do_get_property		(GObject        *object,
							 guint           property_id,
							 GValue         *value,
							 GParamSpec     *pspec);
static void	g_value_object_init			(GValue		*value);
static void	g_value_object_free_value		(GValue		*value);
static void	g_value_object_copy_value		(const GValue	*src_value,
							 GValue		*dest_value);
static void	g_value_object_transform_value		(const GValue	*src_value,
							 GValue		*dest_value);
static gpointer g_value_object_peek_pointer             (const GValue   *value);
static gchar*	g_value_object_collect_value		(GValue		*value,
							 guint           n_collect_values,
							 GTypeCValue    *collect_values,
							 guint           collect_flags);
static gchar*	g_value_object_lcopy_value		(const GValue	*value,
							 guint           n_collect_values,
							 GTypeCValue    *collect_values,
							 guint           collect_flags);
static void	g_object_dispatch_properties_changed	(GObject	*object,
							 guint		 n_pspecs,
							 GParamSpec    **pspecs);
static inline void         object_get_property		(GObject        *object,
							 GParamSpec     *pspec,
							 GValue         *value);
static inline void	   object_set_property		(GObject        *object,
							 GParamSpec     *pspec,
							 const GValue   *value,
							 GObjectNotifyQueue *nqueue);


/* --- variables --- */
static GQuark	            quark_closure_array = 0;
static GQuark	            quark_weak_refs = 0;
static GParamSpecPool      *pspec_pool = NULL;
static GObjectNotifyContext property_notify_context = { 0, };
static gulong	            gobject_signals[LAST_SIGNAL] = { 0, };


/* --- functions --- */
#ifdef	G_ENABLE_DEBUG
#define	IF_DEBUG(debug_type)	if (_g_type_debug_flags & G_TYPE_DEBUG_ ## debug_type)
G_LOCK_DEFINE_STATIC     (debug_objects);
static volatile GObject *g_trap_object_ref = NULL;
static guint		 debug_objects_count = 0;
static GHashTable	*debug_objects_ht = NULL;
static void
debug_objects_foreach (gpointer key,
		       gpointer value,
		       gpointer user_data)
{
  GObject *object = value;

  g_message ("[%p] stale %s\tref_count=%u",
	     object,
	     G_OBJECT_TYPE_NAME (object),
	     object->ref_count);
}
static void
debug_objects_atexit (void)
{
  IF_DEBUG (OBJECTS)
    {
      G_LOCK (debug_objects);
      g_message ("stale GObjects: %u", debug_objects_count);
      g_hash_table_foreach (debug_objects_ht, debug_objects_foreach, NULL);
      G_UNLOCK (debug_objects);
    }
}
#endif	/* G_ENABLE_DEBUG */

void
g_object_type_init (void)	/* sync with gtype.c */
{
  static gboolean initialized = FALSE;
  static const GTypeFundamentalInfo finfo = {
    G_TYPE_FLAG_CLASSED | G_TYPE_FLAG_INSTANTIATABLE | G_TYPE_FLAG_DERIVABLE | G_TYPE_FLAG_DEEP_DERIVABLE,
  };
  static GTypeInfo info = {
    sizeof (GObjectClass),
    (GBaseInitFunc) g_object_base_class_init,
    (GBaseFinalizeFunc) g_object_base_class_finalize,
    (GClassInitFunc) g_object_do_class_init,
    NULL	/* class_destroy */,
    NULL	/* class_data */,
    sizeof (GObject),
    0		/* n_preallocs */,
    (GInstanceInitFunc) g_object_init,
    NULL,	/* value_table */
  };
  static const GTypeValueTable value_table = {
    g_value_object_init,	  /* value_init */
    g_value_object_free_value,	  /* value_free */
    g_value_object_copy_value,	  /* value_copy */
    g_value_object_peek_pointer,  /* value_peek_pointer */
    "p",			  /* collect_format */
    g_value_object_collect_value, /* collect_value */
    "p",			  /* lcopy_format */
    g_value_object_lcopy_value,	  /* lcopy_value */
  };
  GType type;
  
  g_return_if_fail (initialized == FALSE);
  initialized = TRUE;
  
  /* G_TYPE_OBJECT
   */
  info.value_table = &value_table;
  type = g_type_register_fundamental (G_TYPE_OBJECT, "GObject", &info, &finfo, 0);
  g_assert (type == G_TYPE_OBJECT);
  g_value_register_transform_func (G_TYPE_OBJECT, G_TYPE_OBJECT, g_value_object_transform_value);
  
#ifdef	G_ENABLE_DEBUG
  IF_DEBUG (OBJECTS)
    {
      debug_objects_ht = g_hash_table_new (g_direct_hash, NULL);
      g_atexit (debug_objects_atexit);
    }
#endif	/* G_ENABLE_DEBUG */
}

static void
g_object_base_class_init (GObjectClass *class)
{
  GObjectClass *pclass = g_type_class_peek_parent (class);

  /* reset instance specific fields and methods that don't get inherited */
  class->construct_properties = pclass ? g_slist_copy (pclass->construct_properties) : NULL;
  class->get_property = NULL;
  class->set_property = NULL;
}

static void
g_object_base_class_finalize (GObjectClass *class)
{
  GList *list, *node;
  
  _g_signals_destroy (G_OBJECT_CLASS_TYPE (class));

  g_slist_free (class->construct_properties);
  class->construct_properties = NULL;
  list = g_param_spec_pool_list_owned (pspec_pool, G_OBJECT_CLASS_TYPE (class));
  for (node = list; node; node = node->next)
    {
      GParamSpec *pspec = node->data;
      
      g_param_spec_pool_remove (pspec_pool, pspec);
      PARAM_SPEC_SET_PARAM_ID (pspec, 0);
      g_param_spec_unref (pspec);
    }
  g_list_free (list);
}

static void
g_object_notify_dispatcher (GObject     *object,
			    guint        n_pspecs,
			    GParamSpec **pspecs)
{
  G_OBJECT_GET_CLASS (object)->dispatch_properties_changed (object, n_pspecs, pspecs);
}

static void
g_object_do_class_init (GObjectClass *class)
{
  /* read the comment about typedef struct CArray; on why not to change this quark */
  quark_closure_array = g_quark_from_static_string ("GObject-closure-array");

  quark_weak_refs = g_quark_from_static_string ("GObject-weak-references");
  pspec_pool = g_param_spec_pool_new (TRUE);
  property_notify_context.quark_notify_queue = g_quark_from_static_string ("GObject-notify-queue");
  property_notify_context.dispatcher = g_object_notify_dispatcher;
  
  class->constructor = g_object_constructor;
  class->set_property = g_object_do_set_property;
  class->get_property = g_object_do_get_property;
  class->dispose = g_object_real_dispose;
  class->finalize = g_object_finalize;
  class->dispatch_properties_changed = g_object_dispatch_properties_changed;
  class->notify = NULL;

  gobject_signals[NOTIFY] =
    g_signal_new ("notify",
		  G_TYPE_FROM_CLASS (class),
		  G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE | G_SIGNAL_DETAILED | G_SIGNAL_NO_HOOKS,
		  G_STRUCT_OFFSET (GObjectClass, notify),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__PARAM,
		  G_TYPE_NONE,
		  1, G_TYPE_PARAM);
}

void
g_object_class_install_property (GObjectClass *class,
				 guint	       property_id,
				 GParamSpec   *pspec)
{
  g_return_if_fail (G_IS_OBJECT_CLASS (class));
  g_return_if_fail (G_IS_PARAM_SPEC (pspec));
  if (pspec->flags & G_PARAM_WRITABLE)
    g_return_if_fail (class->set_property != NULL);
  if (pspec->flags & G_PARAM_READABLE)
    g_return_if_fail (class->get_property != NULL);
  g_return_if_fail (property_id > 0);
  g_return_if_fail (PARAM_SPEC_PARAM_ID (pspec) == 0);	/* paranoid */
  if (pspec->flags & G_PARAM_CONSTRUCT)
    g_return_if_fail ((pspec->flags & G_PARAM_CONSTRUCT_ONLY) == 0);
  if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
    g_return_if_fail (pspec->flags & G_PARAM_WRITABLE);

  if (g_param_spec_pool_lookup (pspec_pool, pspec->name, G_OBJECT_CLASS_TYPE (class), FALSE))
    {
      g_warning (G_STRLOC ": class `%s' already contains a property named `%s'",
		 G_OBJECT_CLASS_NAME (class),
		 pspec->name);
      return;
    }

  g_param_spec_ref (pspec);
  g_param_spec_sink (pspec);
  PARAM_SPEC_SET_PARAM_ID (pspec, property_id);
  g_param_spec_pool_insert (pspec_pool, pspec, G_OBJECT_CLASS_TYPE (class));
  if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
    class->construct_properties = g_slist_prepend (class->construct_properties, pspec);

  /* for property overrides of construct poperties, we have to get rid
   * of the overidden inherited construct property
   */
  pspec = g_param_spec_pool_lookup (pspec_pool, pspec->name, g_type_parent (G_OBJECT_CLASS_TYPE (class)), TRUE);
  if (pspec && pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
    class->construct_properties = g_slist_remove (class->construct_properties, pspec);
}

GParamSpec*
g_object_class_find_property (GObjectClass *class,
			      const gchar  *property_name)
{
  g_return_val_if_fail (G_IS_OBJECT_CLASS (class), NULL);
  g_return_val_if_fail (property_name != NULL, NULL);
  
  return g_param_spec_pool_lookup (pspec_pool,
				   property_name,
				   G_OBJECT_CLASS_TYPE (class),
				   TRUE);
}

GParamSpec** /* free result */
g_object_class_list_properties (GObjectClass *class,
				guint        *n_properties_p)
{
  GParamSpec **pspecs;
  guint n;

  g_return_val_if_fail (G_IS_OBJECT_CLASS (class), NULL);

  pspecs = g_param_spec_pool_list (pspec_pool,
				   G_OBJECT_CLASS_TYPE (class),
				   &n);
  if (n_properties_p)
    *n_properties_p = n;

  return pspecs;
}

static void
g_object_init (GObject *object)
{
  object->ref_count = 1;
  g_datalist_init (&object->qdata);
  
  /* freeze object's notification queue, g_object_newv() preserves pairedness */
  g_object_notify_queue_freeze (object, &property_notify_context);
  
#ifdef	G_ENABLE_DEBUG
  IF_DEBUG (OBJECTS)
    {
      G_LOCK (debug_objects);
      debug_objects_count++;
      g_hash_table_insert (debug_objects_ht, object, object);
      G_UNLOCK (debug_objects);
    }
#endif	/* G_ENABLE_DEBUG */
}

static void
g_object_do_set_property (GObject      *object,
			  guint         property_id,
			  const GValue *value,
			  GParamSpec   *pspec)
{
  switch (property_id)
    {
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
    }
}

static void
g_object_do_get_property (GObject     *object,
			  guint        property_id,
			  GValue      *value,
			  GParamSpec  *pspec)
{
  switch (property_id)
    {
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
    }
}

static void
g_object_real_dispose (GObject *object)
{
  guint ref_count;

  g_signal_handlers_destroy (object);
  g_datalist_id_set_data (&object->qdata, quark_closure_array, NULL);

  /* yes, temporarily altering the ref_count is hackish, but that
   * enforces people not jerking around with weak_ref notifiers
   */
  ref_count = object->ref_count;
  object->ref_count = 0;
  g_datalist_id_set_data (&object->qdata, quark_weak_refs, NULL);
  object->ref_count = ref_count;
}

static void
g_object_finalize (GObject *object)
{
  g_datalist_clear (&object->qdata);
  
#ifdef	G_ENABLE_DEBUG
  IF_DEBUG (OBJECTS)
    {
      G_LOCK (debug_objects);
      g_assert (g_hash_table_lookup (debug_objects_ht, object) == object);
      g_hash_table_remove (debug_objects_ht, object);
      debug_objects_count--;
      G_UNLOCK (debug_objects);
    }
#endif	/* G_ENABLE_DEBUG */
}

static void
g_object_last_unref (GObject *object)
{
  g_return_if_fail (object->ref_count > 0);
  
  if (object->ref_count == 1)	/* may have been re-referenced meanwhile */
    G_OBJECT_GET_CLASS (object)->dispose (object);
  
#ifdef	G_ENABLE_DEBUG
  if (g_trap_object_ref == object)
    G_BREAKPOINT ();
#endif	/* G_ENABLE_DEBUG */

  object->ref_count -= 1;
  
  if (object->ref_count == 0)	/* may have been re-referenced meanwhile */
    {
      g_signal_handlers_destroy (object);
      g_datalist_id_set_data (&object->qdata, quark_weak_refs, NULL);
      G_OBJECT_GET_CLASS (object)->finalize (object);
#ifdef	G_ENABLE_DEBUG
      IF_DEBUG (OBJECTS)
	{
	  /* catch objects not chaining finalize handlers */
	  G_LOCK (debug_objects);
	  g_assert (g_hash_table_lookup (debug_objects_ht, object) == NULL);
	  G_UNLOCK (debug_objects);
	}
#endif	/* G_ENABLE_DEBUG */
      g_type_free_instance ((GTypeInstance*) object);
    }
}

static void
g_object_dispatch_properties_changed (GObject     *object,
				      guint        n_pspecs,
				      GParamSpec **pspecs)
{
  guint i;

  for (i = 0; i < n_pspecs; i++)
    g_signal_emit (object, gobject_signals[NOTIFY], g_quark_from_string (pspecs[i]->name), pspecs[i]);
}

void
g_object_run_dispose (GObject *object)
{
  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (object->ref_count > 0);

  g_object_ref (object);
  G_OBJECT_GET_CLASS (object)->dispose (object);
  g_object_unref (object);
}

void
g_object_freeze_notify (GObject *object)
{
  g_return_if_fail (G_IS_OBJECT (object));
  if (!object->ref_count)
    return;

  g_object_ref (object);
  g_object_notify_queue_freeze (object, &property_notify_context);
  g_object_unref (object);
}

void
g_object_notify (GObject     *object,
		 const gchar *property_name)
{
  GParamSpec *pspec;
  
  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (property_name != NULL);
  if (!object->ref_count)
    return;
  
  g_object_ref (object);
  pspec = g_param_spec_pool_lookup (pspec_pool,
				    property_name,
				    G_OBJECT_TYPE (object),
				    TRUE);
  if (!pspec)
    g_warning ("%s: object class `%s' has no property named `%s'",
	       G_STRLOC,
	       G_OBJECT_TYPE_NAME (object),
	       property_name);
  else
    {
      GObjectNotifyQueue *nqueue = g_object_notify_queue_freeze (object, &property_notify_context);

      g_object_notify_queue_add (object, nqueue, pspec);
      g_object_notify_queue_thaw (object, nqueue);
    }
  g_object_unref (object);
}

void
g_object_thaw_notify (GObject *object)
{
  GObjectNotifyQueue *nqueue;
  
  g_return_if_fail (G_IS_OBJECT (object));
  if (!object->ref_count)
    return;
  
  g_object_ref (object);
  nqueue = g_object_notify_queue_from_object (object, &property_notify_context);
  if (!nqueue || !nqueue->freeze_count)
    g_warning (G_STRLOC ": property-changed notification for %s(%p) is not frozen",
	       G_OBJECT_TYPE_NAME (object), object);
  else
    g_object_notify_queue_thaw (object, nqueue);
  g_object_unref (object);
}

static inline void
object_get_property (GObject     *object,
		     GParamSpec  *pspec,
		     GValue      *value)
{
  GObjectClass *class = g_type_class_peek (pspec->owner_type);
  
  class->get_property (object, PARAM_SPEC_PARAM_ID (pspec), value, pspec);
}

static inline void
object_set_property (GObject             *object,
		     GParamSpec          *pspec,
		     const GValue        *value,
		     GObjectNotifyQueue  *nqueue)
{
  GValue tmp_value = { 0, };
  GObjectClass *class = g_type_class_peek (pspec->owner_type);

  /* provide a copy to work from, convert (if necessary) and validate */
  g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
  if (!g_value_transform (value, &tmp_value))
    g_warning ("unable to set property `%s' of type `%s' from value of type `%s'",
	       pspec->name,
	       g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
	       G_VALUE_TYPE_NAME (value));
  else if (g_param_value_validate (pspec, &tmp_value) && !(pspec->flags & G_PARAM_LAX_VALIDATION))
    {
      gchar *contents = g_strdup_value_contents (value);

      g_warning ("value \"%s\" of type `%s' is invalid for property `%s' of type `%s'",
		 contents,
		 G_VALUE_TYPE_NAME (value),
		 pspec->name,
		 g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)));
      g_free (contents);
    }
  else
    {
      class->set_property (object, PARAM_SPEC_PARAM_ID (pspec), &tmp_value, pspec);
      g_object_notify_queue_add (object, nqueue, pspec);
    }
  g_value_unset (&tmp_value);
}

gpointer
g_object_new (GType	   object_type,
	      const gchar *first_property_name,
	      ...)
{
  GObject *object;
  va_list var_args;
  
  g_return_val_if_fail (G_TYPE_IS_OBJECT (object_type), NULL);
  
  va_start (var_args, first_property_name);
  object = g_object_new_valist (object_type, first_property_name, var_args);
  va_end (var_args);
  
  return object;
}

gpointer
g_object_newv (GType       object_type,
	       guint       n_parameters,
	       GParameter *parameters)
{
  GObjectConstructParam *cparams, *oparams;
  GObjectNotifyQueue *nqueue;
  GObject *object;
  GObjectClass *class;
  GSList *slist;
  guint n_total_cparams = 0, n_cparams = 0, n_oparams = 0, n_cvalues;
  GValue *cvalues;
  GList *clist = NULL;
  guint i;

  g_return_val_if_fail (G_TYPE_IS_OBJECT (object_type), NULL);

  class = g_type_class_ref (object_type);
  for (slist = class->construct_properties; slist; slist = slist->next)
    {
      clist = g_list_prepend (clist, slist->data);
      n_total_cparams += 1;
    }

  /* collect parameters, sort into construction and normal ones */
  oparams = g_new (GObjectConstructParam, n_parameters);
  cparams = g_new (GObjectConstructParam, n_total_cparams);
  for (i = 0; i < n_parameters; i++)
    {
      GValue *value = &parameters[i].value;
      GParamSpec *pspec = g_param_spec_pool_lookup (pspec_pool,
						    parameters[i].name,
						    object_type,
						    TRUE);
      if (!pspec)
	{
	  g_warning ("%s: object class `%s' has no property named `%s'",
		     G_STRLOC,
		     g_type_name (object_type),
		     parameters[i].name);
	  continue;
	}
      if (!(pspec->flags & G_PARAM_WRITABLE))
	{
	  g_warning ("%s: property `%s' of object class `%s' is not writable",
		     G_STRLOC,
		     pspec->name,
		     g_type_name (object_type));
	  continue;
	}
      if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
	{
	  GList *list = g_list_find (clist, pspec);

	  if (!list)
	    {
	      g_warning (G_STRLOC ": construct property \"%s\" for object `%s' can't be set twice",
			 pspec->name, g_type_name (object_type));
	      continue;
	    }
	  cparams[n_cparams].pspec = pspec;
	  cparams[n_cparams].value = value;
	  n_cparams++;
	  if (!list->prev)
	    clist = list->next;
	  else
	    list->prev->next = list->next;
	  if (list->next)
	    list->next->prev = list->prev;
	  g_list_free_1 (list);
	}
      else
	{
	  oparams[n_oparams].pspec = pspec;
	  oparams[n_oparams].value = value;
	  n_oparams++;
	}
    }

  /* set remaining construction properties to default values */
  n_cvalues = n_total_cparams - n_cparams;
  cvalues = g_new (GValue, n_cvalues);
  while (clist)
    {
      GList *tmp = clist->next;
      GParamSpec *pspec = clist->data;
      GValue *value = cvalues + n_total_cparams - n_cparams - 1;

      value->g_type = 0;
      g_value_init (value, G_PARAM_SPEC_VALUE_TYPE (pspec));
      g_param_value_set_default (pspec, value);

      cparams[n_cparams].pspec = pspec;
      cparams[n_cparams].value = value;
      n_cparams++;

      g_list_free_1 (clist);
      clist = tmp;
    }

  /* construct object from construction parameters */
  object = class->constructor (object_type, n_total_cparams, cparams);

  /* free construction values */
  g_free (cparams);
  while (n_cvalues--)
    g_value_unset (cvalues + n_cvalues);
  g_free (cvalues);
  
  /* release g_object_init() notification queue freeze_count */
  nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
  g_object_notify_queue_thaw (object, nqueue);
  
  /* set remaining properties */
  for (i = 0; i < n_oparams; i++)
    object_set_property (object, oparams[i].pspec, oparams[i].value, nqueue);
  g_free (oparams);

  g_type_class_unref (class);

  /* release our own freeze count and handle notifications */
  g_object_notify_queue_thaw (object, nqueue);
  
  return object;
}

GObject*
g_object_new_valist (GType	  object_type,
		     const gchar *first_property_name,
		     va_list	  var_args)
{
  GObjectClass *class;
  GParameter *params;
  const gchar *name;
  GObject *object;
  guint n_params = 0, n_alloced_params = 16;
  
  g_return_val_if_fail (G_TYPE_IS_OBJECT (object_type), NULL);

  if (!first_property_name)
    return g_object_newv (object_type, 0, NULL);

  class = g_type_class_ref (object_type);

  params = g_new (GParameter, n_alloced_params);
  name = first_property_name;
  while (name)
    {
      gchar *error = NULL;
      GParamSpec *pspec = g_param_spec_pool_lookup (pspec_pool,
						    name,
						    object_type,
						    TRUE);
      if (!pspec)
	{
	  g_warning ("%s: object class `%s' has no property named `%s'",
		     G_STRLOC,
		     g_type_name (object_type),
		     name);
	  break;
	}
      if (n_params >= n_alloced_params)
	{
	  n_alloced_params += 16;
	  params = g_renew (GParameter, params, n_alloced_params);
	}
      params[n_params].name = name;
      params[n_params].value.g_type = 0;
      g_value_init (&params[n_params].value, G_PARAM_SPEC_VALUE_TYPE (pspec));
      G_VALUE_COLLECT (&params[n_params].value, var_args, 0, &error);
      if (error)
	{
	  g_warning ("%s: %s", G_STRLOC, error);
	  g_free (error);

	  /* we purposely leak the value here, it might not be
	   * in a sane state if an error condition occoured
	   */
	  break;
	}
      n_params++;
      name = va_arg (var_args, gchar*);
    }

  object = g_object_newv (object_type, n_params, params);

  while (n_params--)
    g_value_unset (&params[n_params].value);
  g_free (params);

  g_type_class_unref (class);

  return object;
}

static GObject*
g_object_constructor (GType                  type,
		      guint                  n_construct_properties,
		      GObjectConstructParam *construct_params)
{
  GObject *object;

  /* create object */
  object = (GObject*) g_type_create_instance (type);

  /* set construction parameters */
  if (n_construct_properties)
    {
      GObjectNotifyQueue *nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
      
      /* set construct properties */
      while (n_construct_properties--)
	{
	  GValue *value = construct_params->value;
	  GParamSpec *pspec = construct_params->pspec;

	  construct_params++;
	  object_set_property (object, pspec, value, nqueue);
	}
      g_object_notify_queue_thaw (object, nqueue);
      /* the notification queue is still frozen from g_object_init(), so
       * we don't need to handle it here, g_object_newv() takes
       * care of that
       */
    }

  return object;
}

void
g_object_set_valist (GObject	 *object,
		     const gchar *first_property_name,
		     va_list	  var_args)
{
  GObjectNotifyQueue *nqueue;
  const gchar *name;
  
  g_return_if_fail (G_IS_OBJECT (object));
  
  g_object_ref (object);
  nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
  
  name = first_property_name;
  while (name)
    {
      GValue value = { 0, };
      GParamSpec *pspec;
      gchar *error = NULL;
      
      pspec = g_param_spec_pool_lookup (pspec_pool,
					name,
					G_OBJECT_TYPE (object),
					TRUE);
      if (!pspec)
	{
	  g_warning ("%s: object class `%s' has no property named `%s'",
		     G_STRLOC,
		     G_OBJECT_TYPE_NAME (object),
		     name);
	  break;
	}
      if (!(pspec->flags & G_PARAM_WRITABLE))
	{
	  g_warning ("%s: property `%s' of object class `%s' is not writable",
		     G_STRLOC,
		     pspec->name,
		     G_OBJECT_TYPE_NAME (object));
	  break;
	}
      
      g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
      
      G_VALUE_COLLECT (&value, var_args, 0, &error);
      if (error)
	{
	  g_warning ("%s: %s", G_STRLOC, error);
	  g_free (error);
	  
	  /* we purposely leak the value here, it might not be
	   * in a sane state if an error condition occoured
	   */
	  break;
	}
      
      object_set_property (object, pspec, &value, nqueue);
      g_value_unset (&value);
      
      name = va_arg (var_args, gchar*);
    }

  g_object_notify_queue_thaw (object, nqueue);
  g_object_unref (object);
}

void
g_object_get_valist (GObject	 *object,
		     const gchar *first_property_name,
		     va_list	  var_args)
{
  const gchar *name;
  
  g_return_if_fail (G_IS_OBJECT (object));
  
  g_object_ref (object);
  
  name = first_property_name;
  
  while (name)
    {
      GValue value = { 0, };
      GParamSpec *pspec;
      gchar *error;
      
      pspec = g_param_spec_pool_lookup (pspec_pool,
					name,
					G_OBJECT_TYPE (object),
					TRUE);
      if (!pspec)
	{
	  g_warning ("%s: object class `%s' has no property named `%s'",
		     G_STRLOC,
		     G_OBJECT_TYPE_NAME (object),
		     name);
	  break;
	}
      if (!(pspec->flags & G_PARAM_READABLE))
	{
	  g_warning ("%s: property `%s' of object class `%s' is not readable",
		     G_STRLOC,
		     pspec->name,
		     G_OBJECT_TYPE_NAME (object));
	  break;
	}
      
      g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
      
      object_get_property (object, pspec, &value);
      
      G_VALUE_LCOPY (&value, var_args, 0, &error);
      if (error)
	{
	  g_warning ("%s: %s", G_STRLOC, error);
	  g_free (error);
	  g_value_unset (&value);
	  break;
	}
      
      g_value_unset (&value);
      
      name = va_arg (var_args, gchar*);
    }
  
  g_object_unref (object);
}

void
g_object_set (gpointer     _object,
	      const gchar *first_property_name,
	      ...)
{
  GObject *object = _object;
  va_list var_args;
  
  g_return_if_fail (G_IS_OBJECT (object));
  
  va_start (var_args, first_property_name);
  g_object_set_valist (object, first_property_name, var_args);
  va_end (var_args);
}

void
g_object_get (gpointer     _object,
	      const gchar *first_property_name,
	      ...)
{
  GObject *object = _object;
  va_list var_args;
  
  g_return_if_fail (G_IS_OBJECT (object));
  
  va_start (var_args, first_property_name);
  g_object_get_valist (object, first_property_name, var_args);
  va_end (var_args);
}

void
g_object_set_property (GObject	    *object,
		       const gchar  *property_name,
		       const GValue *value)
{
  GObjectNotifyQueue *nqueue;
  GParamSpec *pspec;
  
  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (property_name != NULL);
  g_return_if_fail (G_IS_VALUE (value));
  
  g_object_ref (object);
  nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
  
  pspec = g_param_spec_pool_lookup (pspec_pool,
				    property_name,
				    G_OBJECT_TYPE (object),
				    TRUE);
  if (!pspec)
    g_warning ("%s: object class `%s' has no property named `%s'",
	       G_STRLOC,
	       G_OBJECT_TYPE_NAME (object),
	       property_name);
  else
    object_set_property (object, pspec, value, nqueue);
  
  g_object_notify_queue_thaw (object, nqueue);
  g_object_unref (object);
}

void
g_object_get_property (GObject	   *object,
		       const gchar *property_name,
		       GValue	   *value)
{
  GParamSpec *pspec;
  
  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (property_name != NULL);
  g_return_if_fail (G_IS_VALUE (value));
  
  g_object_ref (object);
  
  pspec = g_param_spec_pool_lookup (pspec_pool,
				    property_name,
				    G_OBJECT_TYPE (object),
				    TRUE);
  if (!pspec)
    g_warning ("%s: object class `%s' has no property named `%s'",
	       G_STRLOC,
	       G_OBJECT_TYPE_NAME (object),
	       property_name);
  else
    {
      GValue *prop_value, tmp_value = { 0, };
      
      /* auto-conversion of the callers value type
       */
      if (G_VALUE_TYPE (value) == G_PARAM_SPEC_VALUE_TYPE (pspec))
	{
	  g_value_reset (value);
	  prop_value = value;
	}
      else if (!g_value_type_transformable (G_PARAM_SPEC_VALUE_TYPE (pspec), G_VALUE_TYPE (value)))
	{
	  g_warning ("can't retrieve property `%s' of type `%s' as value of type `%s'",
		     pspec->name,
		     g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
		     G_VALUE_TYPE_NAME (value));
	  g_object_unref (object);
	  return;
	}
      else
	{
	  g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
	  prop_value = &tmp_value;
	}
      object_get_property (object, pspec, prop_value);
      if (prop_value != value)
	{
	  g_value_transform (prop_value, value);
	  g_value_unset (&tmp_value);
	}
    }
  
  g_object_unref (object);
}

gpointer
g_object_connect (gpointer     _object,
		  const gchar *signal_spec,
		  ...)
{
  GObject *object = _object;
  va_list var_args;

  g_return_val_if_fail (G_IS_OBJECT (object), NULL);
  g_return_val_if_fail (object->ref_count > 0, object);

  va_start (var_args, signal_spec);
  while (signal_spec)
    {
      GCallback callback = va_arg (var_args, GCallback);
      gpointer data = va_arg (var_args, gpointer);
      gulong sid;

      if (strncmp (signal_spec, "signal::", 8) == 0)
	sid = g_signal_connect_data (object, signal_spec + 8,
				     callback, data, NULL,
				     0);
      else if (strncmp (signal_spec, "object_signal::", 15) == 0)
	sid = g_signal_connect_object (object, signal_spec + 15,
				       callback, data,
				       0);
      else if (strncmp (signal_spec, "swapped_signal::", 16) == 0)
	sid = g_signal_connect_data (object, signal_spec + 16,
				     callback, data, NULL,
				     G_CONNECT_SWAPPED);
      else if (strncmp (signal_spec, "swapped_object_signal::", 23) == 0)
	sid = g_signal_connect_object (object, signal_spec + 23,
				       callback, data,
				       G_CONNECT_SWAPPED);
      else if (strncmp (signal_spec, "signal_after::", 14) == 0)
	sid = g_signal_connect_data (object, signal_spec + 14,
				     callback, data, NULL,
				     G_CONNECT_AFTER);
      else if (strncmp (signal_spec, "object_signal_after::", 21) == 0)
	sid = g_signal_connect_object (object, signal_spec + 21,
				       callback, data,
				       G_CONNECT_AFTER);
      else if (strncmp (signal_spec, "swapped_signal_after::", 22) == 0)
	sid = g_signal_connect_data (object, signal_spec + 22,
				     callback, data, NULL,
				     G_CONNECT_SWAPPED | G_CONNECT_AFTER);
      else if (strncmp (signal_spec, "swapped_object_signal_after::", 29) == 0)
	sid = g_signal_connect_object (object, signal_spec + 29,
				       callback, data,
				       G_CONNECT_SWAPPED | G_CONNECT_AFTER);
      else
	{
	  g_warning ("%s: invalid signal spec \"%s\"", G_STRLOC, signal_spec);
	  break;
	}
      signal_spec = va_arg (var_args, gchar*);
    }
  va_end (var_args);

  return object;
}

void
g_object_disconnect (gpointer     _object,
		     const gchar *signal_spec,
		     ...)
{
  GObject *object = _object;
  va_list var_args;

  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (object->ref_count > 0);

  va_start (var_args, signal_spec);
  while (signal_spec)
    {
      GCallback callback = va_arg (var_args, GCallback);
      gpointer data = va_arg (var_args, gpointer);
      guint sid = 0, detail = 0, mask = 0;

      if (strncmp (signal_spec, "any_signal::", 12) == 0)
	{
	  signal_spec += 12;
	  mask = G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA;
	}
      else if (strcmp (signal_spec, "any_signal") == 0)
	{
	  signal_spec += 10;
	  mask = G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA;
	}
      else
	{
	  g_warning ("%s: invalid signal spec \"%s\"", G_STRLOC, signal_spec);
	  break;
	}

      if ((mask & G_SIGNAL_MATCH_ID) &&
	  !g_signal_parse_name (signal_spec, G_OBJECT_TYPE (object), &sid, &detail, FALSE))
	g_warning ("%s: invalid signal name \"%s\"", G_STRLOC, signal_spec);
      else if (!g_signal_handlers_disconnect_matched (object, mask | (detail ? G_SIGNAL_MATCH_DETAIL : 0),
						      sid, detail,
						      NULL, (gpointer)callback, data))
	g_warning (G_STRLOC ": signal handler %p(%p) is not connected", callback, data);
      signal_spec = va_arg (var_args, gchar*);
    }
  va_end (var_args);
}

typedef struct {
  GObject *object;
  guint n_weak_refs;
  struct {
    GWeakNotify notify;
    gpointer    data;
  } weak_refs[1];  /* flexible array */
} WeakRefStack;

static void
weak_refs_notify (gpointer data)
{
  WeakRefStack *wstack = data;
  guint i;

  for (i = 0; i < wstack->n_weak_refs; i++)
    wstack->weak_refs[i].notify (wstack->weak_refs[i].data, wstack->object);
  g_free (wstack);
}

void
g_object_weak_ref (GObject    *object,
		   GWeakNotify notify,
		   gpointer    data)
{
  WeakRefStack *wstack;
  guint i;
  
  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (notify != NULL);
  g_return_if_fail (object->ref_count >= 1);

  wstack = g_datalist_id_remove_no_notify (&object->qdata, quark_weak_refs);
  if (wstack)
    {
      i = wstack->n_weak_refs++;
      wstack = g_realloc (wstack, sizeof (*wstack) + sizeof (wstack->weak_refs[0]) * i);
    }
  else
    {
      wstack = g_renew (WeakRefStack, NULL, 1);
      wstack->object = object;
      wstack->n_weak_refs = 1;
      i = 0;
    }
  wstack->weak_refs[i].notify = notify;
  wstack->weak_refs[i].data = data;
  g_datalist_id_set_data_full (&object->qdata, quark_weak_refs, wstack, weak_refs_notify);
}

void
g_object_weak_unref (GObject    *object,
		     GWeakNotify notify,
		     gpointer    data)
{
  WeakRefStack *wstack;
  gboolean found_one = FALSE;

  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (notify != NULL);

  wstack = g_datalist_id_get_data (&object->qdata, quark_weak_refs);
  if (wstack)
    {
      guint i;

      for (i = 0; i < wstack->n_weak_refs; i++)
	if (wstack->weak_refs[i].notify == notify &&
	    wstack->weak_refs[i].data == data)
	  {
	    found_one = TRUE;
	    wstack->n_weak_refs -= 1;
	    if (i != wstack->n_weak_refs)
	      {
		wstack->weak_refs[i].notify = wstack->weak_refs[wstack->n_weak_refs].notify;
		wstack->weak_refs[i].data = wstack->weak_refs[wstack->n_weak_refs].data;
	      }
	    break;
	  }
    }
  if (!found_one)
    g_warning (G_STRLOC ": couldn't find weak ref %p(%p)", notify, data);
}

void
g_object_add_weak_pointer (GObject  *object, 
                           gpointer *weak_pointer_location)
{
  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (weak_pointer_location != NULL);

  g_object_weak_ref (object, 
                     (GWeakNotify) g_nullify_pointer, 
                     weak_pointer_location);
}

void
g_object_remove_weak_pointer (GObject  *object, 
                              gpointer *weak_pointer_location)
{
  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (weak_pointer_location != NULL);

  g_object_weak_unref (object, 
                       (GWeakNotify) g_nullify_pointer, 
                       weak_pointer_location);
}

gpointer
g_object_ref (gpointer _object)
{
  GObject *object = _object;

  g_return_val_if_fail (G_IS_OBJECT (object), NULL);
  g_return_val_if_fail (object->ref_count > 0, NULL);
  
#ifdef  G_ENABLE_DEBUG
  if (g_trap_object_ref == object)
    G_BREAKPOINT ();
#endif  /* G_ENABLE_DEBUG */

  object->ref_count += 1;
  
  return object;
}

void
g_object_unref (gpointer _object)
{
  GObject *object = _object;

  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (object->ref_count > 0);
  
#ifdef  G_ENABLE_DEBUG
  if (g_trap_object_ref == object)
    G_BREAKPOINT ();
#endif  /* G_ENABLE_DEBUG */

  if (object->ref_count > 1)
    object->ref_count -= 1;
  else
    g_object_last_unref (object);
}

gpointer
g_object_get_qdata (GObject *object,
		    GQuark   quark)
{
  g_return_val_if_fail (G_IS_OBJECT (object), NULL);
  
  return quark ? g_datalist_id_get_data (&object->qdata, quark) : NULL;
}

void
g_object_set_qdata (GObject *object,
		    GQuark   quark,
		    gpointer data)
{
  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (quark > 0);
  
  g_datalist_id_set_data (&object->qdata, quark, data);
}

void
g_object_set_qdata_full (GObject       *object,
			 GQuark		quark,
			 gpointer	data,
			 GDestroyNotify destroy)
{
  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (quark > 0);
  
  g_datalist_id_set_data_full (&object->qdata, quark, data,
			       data ? destroy : (GDestroyNotify) NULL);
}

gpointer
g_object_steal_qdata (GObject *object,
		      GQuark   quark)
{
  g_return_val_if_fail (G_IS_OBJECT (object), NULL);
  g_return_val_if_fail (quark > 0, NULL);
  
  return g_datalist_id_remove_no_notify (&object->qdata, quark);
}

gpointer
g_object_get_data (GObject     *object,
                   const gchar *key)
{
  GQuark quark;

  g_return_val_if_fail (G_IS_OBJECT (object), NULL);
  g_return_val_if_fail (key != NULL, NULL);

  quark = g_quark_try_string (key);

  return quark ? g_datalist_id_get_data (&object->qdata, quark) : NULL;
}

void
g_object_set_data (GObject     *object,
                   const gchar *key,
                   gpointer     data)
{
  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (key != NULL);

  g_datalist_id_set_data (&object->qdata, g_quark_from_string (key), data);
}

void
g_object_set_data_full (GObject       *object,
                        const gchar   *key,
                        gpointer       data,
                        GDestroyNotify destroy)
{
  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (key != NULL);

  g_datalist_id_set_data_full (&object->qdata, g_quark_from_string (key), data,
			       data ? destroy : (GDestroyNotify) NULL);
}

gpointer
g_object_steal_data (GObject     *object,
                     const gchar *key)
{
  GQuark quark;

  g_return_val_if_fail (G_IS_OBJECT (object), NULL);
  g_return_val_if_fail (key != NULL, NULL);

  quark = g_quark_try_string (key);

  return quark ? g_datalist_id_remove_no_notify (&object->qdata, quark) : NULL;
}

static void
g_value_object_init (GValue *value)
{
  value->data[0].v_pointer = NULL;
}

static void
g_value_object_free_value (GValue *value)
{
  if (value->data[0].v_pointer)
    g_object_unref (value->data[0].v_pointer);
}

static void
g_value_object_copy_value (const GValue *src_value,
			   GValue	*dest_value)
{
  if (src_value->data[0].v_pointer)
    dest_value->data[0].v_pointer = g_object_ref (src_value->data[0].v_pointer);
  else
    dest_value->data[0].v_pointer = NULL;
}

static void
g_value_object_transform_value (const GValue *src_value,
				GValue       *dest_value)
{
  if (src_value->data[0].v_pointer && g_type_is_a (G_OBJECT_TYPE (src_value->data[0].v_pointer), G_VALUE_TYPE (dest_value)))
    dest_value->data[0].v_pointer = g_object_ref (src_value->data[0].v_pointer);
  else
    dest_value->data[0].v_pointer = NULL;
}

static gpointer
g_value_object_peek_pointer (const GValue *value)
{
  return value->data[0].v_pointer;
}

static gchar*
g_value_object_collect_value (GValue	  *value,
			      guint        n_collect_values,
			      GTypeCValue *collect_values,
			      guint        collect_flags)
{
  if (collect_values[0].v_pointer)
    {
      GObject *object = collect_values[0].v_pointer;
      
      if (object->g_type_instance.g_class == NULL)
	return g_strconcat ("invalid unclassed object pointer for value type `",
			    G_VALUE_TYPE_NAME (value),
			    "'",
			    NULL);
      else if (!g_value_type_compatible (G_OBJECT_TYPE (object), G_VALUE_TYPE (value)))
	return g_strconcat ("invalid object type `",
			    G_OBJECT_TYPE_NAME (object),
			    "' for value type `",
			    G_VALUE_TYPE_NAME (value),
			    "'",
			    NULL);
      /* never honour G_VALUE_NOCOPY_CONTENTS for ref-counted types */
      value->data[0].v_pointer = g_object_ref (object);
    }
  else
    value->data[0].v_pointer = NULL;
  
  return NULL;
}

static gchar*
g_value_object_lcopy_value (const GValue *value,
			    guint        n_collect_values,
			    GTypeCValue *collect_values,
			    guint        collect_flags)
{
  GObject **object_p = collect_values[0].v_pointer;
  
  if (!object_p)
    return g_strdup_printf ("value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value));

  if (!value->data[0].v_pointer)
    *object_p = NULL;
  else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
    *object_p = value->data[0].v_pointer;
  else
    *object_p = g_object_ref (value->data[0].v_pointer);
  
  return NULL;
}

void
g_value_set_object (GValue   *value,
		    gpointer  v_object)
{
  GObject *old;
	
  g_return_if_fail (G_VALUE_HOLDS_OBJECT (value));

  old = value->data[0].v_pointer;
  
  if (v_object)
    {
      g_return_if_fail (G_IS_OBJECT (v_object));
      g_return_if_fail (g_value_type_compatible (G_OBJECT_TYPE (v_object), G_VALUE_TYPE (value)));

      value->data[0].v_pointer = v_object;
      g_object_ref (value->data[0].v_pointer);
    }
  else
    value->data[0].v_pointer = NULL;
  
  if (old)
    g_object_unref (old);
}

void
g_value_set_object_take_ownership (GValue  *value,
				   gpointer v_object)
{
  g_return_if_fail (G_VALUE_HOLDS_OBJECT (value));

  if (value->data[0].v_pointer)
    {
      g_object_unref (value->data[0].v_pointer);
      value->data[0].v_pointer = NULL;
    }

  if (v_object)
    {
      g_return_if_fail (G_IS_OBJECT (v_object));
      g_return_if_fail (g_value_type_compatible (G_OBJECT_TYPE (v_object), G_VALUE_TYPE (value)));

      value->data[0].v_pointer = v_object; /* we take over the reference count */
    }
}

gpointer
g_value_get_object (const GValue *value)
{
  g_return_val_if_fail (G_VALUE_HOLDS_OBJECT (value), NULL);
  
  return value->data[0].v_pointer;
}

GObject*
g_value_dup_object (const GValue *value)
{
  g_return_val_if_fail (G_VALUE_HOLDS_OBJECT (value), NULL);
  
  return value->data[0].v_pointer ? g_object_ref (value->data[0].v_pointer) : NULL;
}

gulong
g_signal_connect_object (gpointer      instance,
			 const gchar  *detailed_signal,
			 GCallback     c_handler,
			 gpointer      gobject,
			 GConnectFlags connect_flags)
{
  g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
  g_return_val_if_fail (detailed_signal != NULL, 0);
  g_return_val_if_fail (c_handler != NULL, 0);

  if (gobject)
    {
      GClosure *closure;

      g_return_val_if_fail (G_IS_OBJECT (gobject), 0);

      closure = ((connect_flags & G_CONNECT_SWAPPED) ? g_cclosure_new_object_swap : g_cclosure_new_object) (c_handler, gobject);

      return g_signal_connect_closure (instance, detailed_signal, closure, connect_flags & G_CONNECT_AFTER);
    }
  else
    return g_signal_connect_data (instance, detailed_signal, c_handler, NULL, NULL, connect_flags);
}

typedef struct {
  GObject  *object;
  guint     n_closures;
  GClosure *closures[1]; /* flexible array */
} CArray;
/* don't change this structure without supplying an accessor for
 * watched closures, e.g.:
 * GSList* g_object_list_watched_closures (GObject *object)
 * {
 *   CArray *carray;
 *   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
 *   carray = g_object_get_data (object, "GObject-closure-array");
 *   if (carray)
 *     {
 *       GSList *slist = NULL;
 *       guint i;
 *       for (i = 0; i < carray->n_closures; i++)
 *         slist = g_slist_prepend (slist, carray->closures[i]);
 *       return slist;
 *     }
 *   return NULL;
 * }
 */

static void
object_remove_closure (gpointer  data,
		       GClosure *closure)
{
  GObject *object = data;
  CArray *carray = g_object_get_qdata (object, quark_closure_array);
  guint i;
  
  for (i = 0; i < carray->n_closures; i++)
    if (carray->closures[i] == closure)
      {
	carray->n_closures--;
	if (i < carray->n_closures)
	  carray->closures[i] = carray->closures[carray->n_closures];
	return;
      }
  g_assert_not_reached ();
}

static void
destroy_closure_array (gpointer data)
{
  CArray *carray = data;
  GObject *object = carray->object;
  guint i, n = carray->n_closures;
  
  for (i = 0; i < n; i++)
    {
      GClosure *closure = carray->closures[i];
      
      /* removing object_remove_closure() upfront is probably faster than
       * letting it fiddle with quark_closure_array which is empty anyways
       */
      g_closure_remove_invalidate_notifier (closure, object, object_remove_closure);
      g_closure_invalidate (closure);
    }
  g_free (carray);
}

void
g_object_watch_closure (GObject  *object,
			GClosure *closure)
{
  CArray *carray;
  guint i;
  
  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (closure != NULL);
  g_return_if_fail (closure->is_invalid == FALSE);
  g_return_if_fail (closure->in_marshal == FALSE);
  g_return_if_fail (object->ref_count > 0);	/* this doesn't work on finalizing objects */
  
  g_closure_add_invalidate_notifier (closure, object, object_remove_closure);
  g_closure_add_marshal_guards (closure,
				object, (GClosureNotify) g_object_ref,
				object, (GClosureNotify) g_object_unref);
  carray = g_datalist_id_remove_no_notify (&object->qdata, quark_closure_array);
  if (!carray)
    {
      carray = g_renew (CArray, NULL, 1);
      carray->object = object;
      carray->n_closures = 1;
      i = 0;
    }
  else
    {
      i = carray->n_closures++;
      carray = g_realloc (carray, sizeof (*carray) + sizeof (carray->closures[0]) * i);
    }
  carray->closures[i] = closure;
  g_datalist_id_set_data_full (&object->qdata, quark_closure_array, carray, destroy_closure_array);
}

GClosure*
g_closure_new_object (guint    sizeof_closure,
		      GObject *object)
{
  GClosure *closure;

  g_return_val_if_fail (G_IS_OBJECT (object), NULL);
  g_return_val_if_fail (object->ref_count > 0, NULL);     /* this doesn't work on finalizing objects */

  closure = g_closure_new_simple (sizeof_closure, object);
  g_object_watch_closure (object, closure);

  return closure;
}

GClosure*
g_cclosure_new_object (GCallback callback_func,
		       GObject  *object)
{
  GClosure *closure;

  g_return_val_if_fail (G_IS_OBJECT (object), NULL);
  g_return_val_if_fail (object->ref_count > 0, NULL);     /* this doesn't work on finalizing objects */
  g_return_val_if_fail (callback_func != NULL, NULL);

  closure = g_cclosure_new (callback_func, object, NULL);
  g_object_watch_closure (object, closure);

  return closure;
}

GClosure*
g_cclosure_new_object_swap (GCallback callback_func,
			    GObject  *object)
{
  GClosure *closure;

  g_return_val_if_fail (G_IS_OBJECT (object), NULL);
  g_return_val_if_fail (object->ref_count > 0, NULL);     /* this doesn't work on finalizing objects */
  g_return_val_if_fail (callback_func != NULL, NULL);

  closure = g_cclosure_new_swap (callback_func, object, NULL);
  g_object_watch_closure (object, closure);

  return closure;
}