gobject/gobject.c

   1 /* GObject - GLib Type, Object, Parameter and Signal Library
   2  * Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General
  15  * Public License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19 #include        "gobject.h"
  20
  21 /*
  22  * MT safe
  23  */
  24
  25 #include        "gvaluecollector.h"
  26 #include        "gsignal.h"
  27 #include        "gparamspecs.h"
  28 #include        "gvaluetypes.h"
  29 #include        "gobjectnotifyqueue.c"
  30 #include        <string.h>
  31
  32
  33 #define PREALLOC_CPARAMS        (8)
  34
  35
  36 /* --- macros --- */
  37 #define PARAM_SPEC_PARAM_ID(pspec)              ((pspec)->param_id)
  38 #define PARAM_SPEC_SET_PARAM_ID(pspec, id)      ((pspec)->param_id = (id))
  39
  40
  41 /* --- signals --- */
  42 enum {
  43   PROPERTIES_CHANGED,
  44   NOTIFY,
  45   LAST_SIGNAL
  46 };
  47
  48
  49 /* --- properties --- */
  50 enum {
  51   PROP_NONE
  52 };
  53
  54
  55 /* --- prototypes --- */
  56 static void     g_object_base_class_init                (GObjectClass   *class);
  57 static void     g_object_base_class_finalize            (GObjectClass   *class);
  58 static void     g_object_do_class_init                  (GObjectClass   *class);
  59 static void     g_object_init                           (GObject        *object);
  60 static GObject* g_object_constructor                    (GType                  type,
  61                                                          guint                  n_construct_properties,
  62                                                          GObjectConstructParam *construct_params);
  63 static void     g_object_last_unref                     (GObject        *object);
  64 static void     g_object_real_dispose                   (GObject        *object);
  65 static void     g_object_finalize                       (GObject        *object);
  66 static void     g_object_do_set_property                (GObject        *object,
  67                                                          guint           property_id,
  68                                                          const GValue   *value,
  69                                                          GParamSpec     *pspec);
  70 static void     g_object_do_get_property                (GObject        *object,
  71                                                          guint           property_id,
  72                                                          GValue         *value,
  73                                                          GParamSpec     *pspec);
  74 static void     g_value_object_init                     (GValue         *value);
  75 static void     g_value_object_free_value               (GValue         *value);
  76 static void     g_value_object_copy_value               (const GValue   *src_value,
  77                                                          GValue         *dest_value);
  78 static void     g_value_object_transform_value          (const GValue   *src_value,
  79                                                          GValue         *dest_value);
  80 static gpointer g_value_object_peek_pointer             (const GValue   *value);
  81 static gchar*   g_value_object_collect_value            (GValue         *value,
  82                                                          guint           n_collect_values,
  83                                                          GTypeCValue    *collect_values,
  84                                                          guint           collect_flags);
  85 static gchar*   g_value_object_lcopy_value              (const GValue   *value,
  86                                                          guint           n_collect_values,
  87                                                          GTypeCValue    *collect_values,
  88                                                          guint           collect_flags);
  89 static void     g_object_dispatch_properties_changed    (GObject        *object,
  90                                                          guint           n_pspecs,
  91                                                          GParamSpec    **pspecs);
  92 static inline void         object_get_property          (GObject        *object,
  93                                                          GParamSpec     *pspec,
  94                                                          GValue         *value);
  95 static inline void         object_set_property          (GObject        *object,
  96                                                          GParamSpec     *pspec,
  97                                                          const GValue   *value,
  98                                                          GObjectNotifyQueue *nqueue);
  99
 100
 101 /* --- structures --- */
 102
 103
 104 /* --- variables --- */
 105 static GQuark               quark_closure_array = 0;
 106 static GQuark               quark_weak_refs = 0;
 107 static GParamSpecPool      *pspec_pool = NULL;
 108 static GObjectNotifyContext property_notify_context = { 0, };
 109 static gulong               gobject_signals[LAST_SIGNAL] = { 0, };
 110
 111
 112 /* --- functions --- */
 113 #ifdef  G_ENABLE_DEBUG
 114 #define IF_DEBUG(debug_type)    if (_g_type_debug_flags & G_TYPE_DEBUG_ ## debug_type)
 115 G_LOCK_DEFINE_STATIC     (debug_objects);
 116 static volatile GObject *g_trap_object_ref = NULL;
 117 static guint             debug_objects_count = 0;
 118 static GHashTable       *debug_objects_ht = NULL;
 119 static void
 120 debug_objects_foreach (gpointer key,
 121                        gpointer value,
 122                        gpointer user_data)
 123 {
 124   GObject *object = value;
 125
 126   g_message ("[%p] stale %s\tref_count=%u",
 127              object,
 128              G_OBJECT_TYPE_NAME (object),
 129              object->ref_count);
 130 }
 131 static void
 132 debug_objects_atexit (void)
 133 {
 134   IF_DEBUG (OBJECTS)
 135     {
 136       G_LOCK (debug_objects);
 137       g_message ("stale GObjects: %u", debug_objects_count);
 138       g_hash_table_foreach (debug_objects_ht, debug_objects_foreach, NULL);
 139       G_UNLOCK (debug_objects);
 140     }
 141 }
 142 #endif  /* G_ENABLE_DEBUG */
 143
 144 void
 145 g_object_type_init (void)       /* sync with gtype.c */
 146 {
 147   static gboolean initialized = FALSE;
 148   static const GTypeFundamentalInfo finfo = {
 149     G_TYPE_FLAG_CLASSED | G_TYPE_FLAG_INSTANTIATABLE | G_TYPE_FLAG_DERIVABLE | G_TYPE_FLAG_DEEP_DERIVABLE,
 150   };
 151   static GTypeInfo info = {
 152     sizeof (GObjectClass),
 153     (GBaseInitFunc) g_object_base_class_init,
 154     (GBaseFinalizeFunc) g_object_base_class_finalize,
 155     (GClassInitFunc) g_object_do_class_init,
 156     NULL        /* class_destroy */,
 157     NULL        /* class_data */,
 158     sizeof (GObject),
 159     0           /* n_preallocs */,
 160     (GInstanceInitFunc) g_object_init,
 161     NULL,       /* value_table */
 162   };
 163   static const GTypeValueTable value_table = {
 164     g_value_object_init,          /* value_init */
 165     g_value_object_free_value,    /* value_free */
 166     g_value_object_copy_value,    /* value_copy */
 167     g_value_object_peek_pointer,  /* value_peek_pointer */
 168     "p",                          /* collect_format */
 169     g_value_object_collect_value, /* collect_value */
 170     "p",                          /* lcopy_format */
 171     g_value_object_lcopy_value,   /* lcopy_value */
 172   };
 173   GType type;
 174
 175   g_return_if_fail (initialized == FALSE);
 176   initialized = TRUE;
 177
 178   /* G_TYPE_OBJECT
 179    */
 180   info.value_table = &value_table;
 181   type = g_type_register_fundamental (G_TYPE_OBJECT, "GObject", &info, &finfo, 0);
 182   g_assert (type == G_TYPE_OBJECT);
 183   g_value_register_transform_func (G_TYPE_OBJECT, G_TYPE_OBJECT, g_value_object_transform_value);
 184
 185 #ifdef  G_ENABLE_DEBUG
 186   IF_DEBUG (OBJECTS)
 187     {
 188       debug_objects_ht = g_hash_table_new (g_direct_hash, NULL);
 189       g_atexit (debug_objects_atexit);
 190     }
 191 #endif  /* G_ENABLE_DEBUG */
 192 }
 193
 194 static void
 195 g_object_base_class_init (GObjectClass *class)
 196 {
 197   GObjectClass *pclass = g_type_class_peek_parent (class);
 198
 199   /* reset instance specific fields and methods that don't get inherited */
 200   class->construct_properties = pclass ? g_slist_copy (pclass->construct_properties) : NULL;
 201   class->get_property = NULL;
 202   class->set_property = NULL;
 203 }
 204
 205 static void
 206 g_object_base_class_finalize (GObjectClass *class)
 207 {
 208   GList *list, *node;
 209
 210   g_message ("finallizing base class of %s", G_OBJECT_CLASS_NAME (class));
 211
 212   _g_signals_destroy (G_OBJECT_CLASS_TYPE (class));
 213
 214   g_slist_free (class->construct_properties);
 215   class->construct_properties = NULL;
 216   list = g_param_spec_pool_list_owned (pspec_pool, G_OBJECT_CLASS_TYPE (class));
 217   for (node = list; node; node = node->next)
 218     {
 219       GParamSpec *pspec = node->data;
 220
 221       g_param_spec_pool_remove (pspec_pool, pspec);
 222       PARAM_SPEC_SET_PARAM_ID (pspec, 0);
 223       g_param_spec_unref (pspec);
 224     }
 225   g_list_free (list);
 226 }
 227
 228 static void
 229 g_object_notify_dispatcher (GObject     *object,
 230                             guint        n_pspecs,
 231                             GParamSpec **pspecs)
 232 {
 233   G_OBJECT_GET_CLASS (object)->dispatch_properties_changed (object, n_pspecs, pspecs);
 234 }
 235
 236 static void
 237 g_object_do_class_init (GObjectClass *class)
 238 {
 239   quark_closure_array = g_quark_from_static_string ("GObject-closure-array");
 240   quark_weak_refs = g_quark_from_static_string ("GObject-weak-references");
 241   pspec_pool = g_param_spec_pool_new (TRUE);
 242   property_notify_context.quark_notify_queue = g_quark_from_static_string ("GObject-notify-queue");
 243   property_notify_context.dispatcher = g_object_notify_dispatcher;
 244
 245   class->constructor = g_object_constructor;
 246   class->set_property = g_object_do_set_property;
 247   class->get_property = g_object_do_get_property;
 248   class->dispose = g_object_real_dispose;
 249   class->finalize = g_object_finalize;
 250   class->dispatch_properties_changed = g_object_dispatch_properties_changed;
 251   class->notify = NULL;
 252
 253   gobject_signals[NOTIFY] =
 254     g_signal_new ("notify",
 255                   G_TYPE_FROM_CLASS (class),
 256                   G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE | G_SIGNAL_DETAILED | G_SIGNAL_NO_HOOKS,
 257                   G_STRUCT_OFFSET (GObjectClass, notify),
 258                   NULL, NULL,
 259                   g_cclosure_marshal_VOID__PARAM,
 260                   G_TYPE_NONE,
 261                   1, G_TYPE_PARAM);
 262 }
 263
 264 void
 265 g_object_class_install_property (GObjectClass *class,
 266                                  guint         property_id,
 267                                  GParamSpec   *pspec)
 268 {
 269   g_return_if_fail (G_IS_OBJECT_CLASS (class));
 270   g_return_if_fail (G_IS_PARAM_SPEC (pspec));
 271   if (pspec->flags & G_PARAM_WRITABLE)
 272     g_return_if_fail (class->set_property != NULL);
 273   if (pspec->flags & G_PARAM_READABLE)
 274     g_return_if_fail (class->get_property != NULL);
 275   g_return_if_fail (property_id > 0);
 276   g_return_if_fail (PARAM_SPEC_PARAM_ID (pspec) == 0);  /* paranoid */
 277   if (pspec->flags & G_PARAM_CONSTRUCT)
 278     g_return_if_fail ((pspec->flags & G_PARAM_CONSTRUCT_ONLY) == 0);
 279   if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
 280     g_return_if_fail (pspec->flags & G_PARAM_WRITABLE);
 281
 282   if (g_param_spec_pool_lookup (pspec_pool, pspec->name, G_OBJECT_CLASS_TYPE (class), FALSE))
 283     {
 284       g_warning (G_STRLOC ": class `%s' already contains a property named `%s'",
 285                  G_OBJECT_CLASS_NAME (class),
 286                  pspec->name);
 287       return;
 288     }
 289
 290   g_param_spec_ref (pspec);
 291   g_param_spec_sink (pspec);
 292   PARAM_SPEC_SET_PARAM_ID (pspec, property_id);
 293   g_param_spec_pool_insert (pspec_pool, pspec, G_OBJECT_CLASS_TYPE (class));
 294   if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
 295     class->construct_properties = g_slist_prepend (class->construct_properties, pspec);
 296
 297   /* for property overrides of construct poperties, we have to get rid
 298    * of the overidden inherited construct property
 299    */
 300   pspec = g_param_spec_pool_lookup (pspec_pool, pspec->name, g_type_parent (G_OBJECT_CLASS_TYPE (class)), TRUE);
 301   if (pspec && pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
 302     class->construct_properties = g_slist_remove (class->construct_properties, pspec);
 303 }
 304
 305 GParamSpec*
 306 g_object_class_find_property (GObjectClass *class,
 307                               const gchar  *property_name)
 308 {
 309   g_return_val_if_fail (G_IS_OBJECT_CLASS (class), NULL);
 310   g_return_val_if_fail (property_name != NULL, NULL);
 311
 312   return g_param_spec_pool_lookup (pspec_pool,
 313                                    property_name,
 314                                    G_OBJECT_CLASS_TYPE (class),
 315                                    TRUE);
 316 }
 317
 318 GParamSpec** /* free result */
 319 g_object_class_list_properties (GObjectClass *class,
 320                                 guint        *n_properties_p)
 321 {
 322   GParamSpec **pspecs;
 323   guint n;
 324
 325   g_return_val_if_fail (G_IS_OBJECT_CLASS (class), NULL);
 326
 327   pspecs = g_param_spec_pool_list (pspec_pool,
 328                                    G_OBJECT_CLASS_TYPE (class),
 329                                    &n);
 330   if (n_properties_p)
 331     *n_properties_p = n;
 332
 333   return pspecs;
 334 }
 335
 336 static void
 337 g_object_init (GObject *object)
 338 {
 339   object->ref_count = 1;
 340   g_datalist_init (&object->qdata);
 341
 342   /* freeze object's notification queue, g_object_newv() preserves pairedness */
 343   g_object_notify_queue_freeze (object, &property_notify_context);
 344
 345 #ifdef  G_ENABLE_DEBUG
 346   IF_DEBUG (OBJECTS)
 347     {
 348       G_LOCK (debug_objects);
 349       debug_objects_count++;
 350       g_hash_table_insert (debug_objects_ht, object, object);
 351       G_UNLOCK (debug_objects);
 352     }
 353 #endif  /* G_ENABLE_DEBUG */
 354 }
 355
 356 static void
 357 g_object_do_set_property (GObject      *object,
 358                           guint         property_id,
 359                           const GValue *value,
 360                           GParamSpec   *pspec)
 361 {
 362   switch (property_id)
 363     {
 364     default:
 365       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
 366       break;
 367     }
 368 }
 369
 370 static void
 371 g_object_do_get_property (GObject     *object,
 372                           guint        property_id,
 373                           GValue      *value,
 374                           GParamSpec  *pspec)
 375 {
 376   switch (property_id)
 377     {
 378     default:
 379       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
 380       break;
 381     }
 382 }
 383
 384 static void
 385 g_object_real_dispose (GObject *object)
 386 {
 387   guint ref_count;
 388
 389   g_signal_handlers_destroy (object);
 390   g_datalist_id_set_data (&object->qdata, quark_closure_array, NULL);
 391
 392   /* yes, temporarily altering the ref_count is hackish, but that
 393    * enforces people not jerking around with weak_ref notifiers
 394    */
 395   ref_count = object->ref_count;
 396   object->ref_count = 0;
 397   g_datalist_id_set_data (&object->qdata, quark_weak_refs, NULL);
 398   object->ref_count = ref_count;
 399 }
 400
 401 static void
 402 g_object_finalize (GObject *object)
 403 {
 404   g_datalist_clear (&object->qdata);
 405
 406 #ifdef  G_ENABLE_DEBUG
 407   IF_DEBUG (OBJECTS)
 408     {
 409       G_LOCK (debug_objects);
 410       g_assert (g_hash_table_lookup (debug_objects_ht, object) == object);
 411       g_hash_table_remove (debug_objects_ht, object);
 412       debug_objects_count--;
 413       G_UNLOCK (debug_objects);
 414     }
 415 #endif  /* G_ENABLE_DEBUG */
 416 }
 417
 418 static void
 419 g_object_last_unref (GObject *object)
 420 {
 421   g_return_if_fail (object->ref_count > 0);
 422
 423   if (object->ref_count == 1)   /* may have been re-referenced meanwhile */
 424     G_OBJECT_GET_CLASS (object)->dispose (object);
 425
 426 #ifdef  G_ENABLE_DEBUG
 427   if (g_trap_object_ref == object)
 428     G_BREAKPOINT ();
 429 #endif  /* G_ENABLE_DEBUG */
 430
 431   object->ref_count -= 1;
 432
 433   if (object->ref_count == 0)   /* may have been re-referenced meanwhile */
 434     {
 435       g_datalist_id_set_data (&object->qdata, quark_weak_refs, NULL);
 436       G_OBJECT_GET_CLASS (object)->finalize (object);
 437 #ifdef  G_ENABLE_DEBUG
 438       IF_DEBUG (OBJECTS)
 439         {
 440           /* catch objects not chaining finalize handlers */
 441           G_LOCK (debug_objects);
 442           g_assert (g_hash_table_lookup (debug_objects_ht, object) == NULL);
 443           G_UNLOCK (debug_objects);
 444         }
 445 #endif  /* G_ENABLE_DEBUG */
 446       g_type_free_instance ((GTypeInstance*) object);
 447     }
 448 }
 449
 450 static void
 451 g_object_dispatch_properties_changed (GObject     *object,
 452                                       guint        n_pspecs,
 453                                       GParamSpec **pspecs)
 454 {
 455   guint i;
 456
 457   for (i = 0; i < n_pspecs; i++)
 458     g_signal_emit (object, gobject_signals[NOTIFY], g_quark_from_string (pspecs[i]->name), pspecs[i]);
 459 }
 460
 461 void
 462 g_object_run_dispose (GObject *object)
 463 {
 464   g_return_if_fail (G_IS_OBJECT (object));
 465   g_return_if_fail (object->ref_count > 0);
 466
 467   g_object_ref (object);
 468   G_OBJECT_GET_CLASS (object)->dispose (object);
 469   g_object_unref (object);
 470 }
 471
 472 void
 473 g_object_freeze_notify (GObject *object)
 474 {
 475   g_return_if_fail (G_IS_OBJECT (object));
 476   if (!object->ref_count)
 477     return;
 478
 479   g_object_ref (object);
 480   g_object_notify_queue_freeze (object, &property_notify_context);
 481   g_object_unref (object);
 482 }
 483
 484 void
 485 g_object_notify (GObject     *object,
 486                  const gchar *property_name)
 487 {
 488   GParamSpec *pspec;
 489
 490   g_return_if_fail (G_IS_OBJECT (object));
 491   g_return_if_fail (property_name != NULL);
 492   if (!object->ref_count)
 493     return;
 494
 495   g_object_ref (object);
 496   pspec = g_param_spec_pool_lookup (pspec_pool,
 497                                     property_name,
 498                                     G_OBJECT_TYPE (object),
 499                                     TRUE);
 500   if (!pspec)
 501     g_warning ("%s: object class `%s' has no property named `%s'",
 502                G_STRLOC,
 503                G_OBJECT_TYPE_NAME (object),
 504                property_name);
 505   else
 506     {
 507       GObjectNotifyQueue *nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
 508
 509       g_object_notify_queue_add (object, nqueue, pspec);
 510       g_object_notify_queue_thaw (object, nqueue);
 511     }
 512   g_object_unref (object);
 513 }
 514
 515 void
 516 g_object_thaw_notify (GObject *object)
 517 {
 518   GObjectNotifyQueue *nqueue;
 519
 520   g_return_if_fail (G_IS_OBJECT (object));
 521   if (!object->ref_count)
 522     return;
 523
 524   g_object_ref (object);
 525   nqueue = g_object_notify_queue_from_object (object, &property_notify_context);
 526   if (!nqueue || !nqueue->freeze_count)
 527     g_warning (G_STRLOC ": property-changed notification for %s(%p) is not frozen",
 528                G_OBJECT_TYPE_NAME (object), object);
 529   else
 530     g_object_notify_queue_thaw (object, nqueue);
 531   g_object_unref (object);
 532 }
 533
 534 static inline void
 535 object_get_property (GObject     *object,
 536                      GParamSpec  *pspec,
 537                      GValue      *value)
 538 {
 539   GObjectClass *class = g_type_class_peek (pspec->owner_type);
 540
 541   class->get_property (object, PARAM_SPEC_PARAM_ID (pspec), value, pspec);
 542 }
 543
 544 static inline void
 545 object_set_property (GObject             *object,
 546                      GParamSpec          *pspec,
 547                      const GValue        *value,
 548                      GObjectNotifyQueue  *nqueue)
 549 {
 550   GValue tmp_value = { 0, };
 551   GObjectClass *class = g_type_class_peek (pspec->owner_type);
 552
 553   /* provide a copy to work from, convert (if necessary) and validate */
 554   g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 555   if (!g_value_transform (value, &tmp_value))
 556     g_warning ("unable to set property `%s' of type `%s' from value of type `%s'",
 557                pspec->name,
 558                g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
 559                G_VALUE_TYPE_NAME (value));
 560   else if (g_param_value_validate (pspec, &tmp_value) && !(pspec->flags & G_PARAM_LAX_VALIDATION))
 561     {
 562       gchar *contents = g_strdup_value_contents (value);
 563
 564       g_warning ("value \"%s\" of type `%s' is invalid for property `%s' of type `%s'",
 565                  contents,
 566                  G_VALUE_TYPE_NAME (value),
 567                  pspec->name,
 568                  g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)));
 569       g_free (contents);
 570     }
 571   else
 572     {
 573       class->set_property (object, PARAM_SPEC_PARAM_ID (pspec), &tmp_value, pspec);
 574       g_object_notify_queue_add (object, nqueue, pspec);
 575     }
 576   g_value_unset (&tmp_value);
 577 }
 578
 579 gpointer
 580 g_object_new (GType        object_type,
 581               const gchar *first_property_name,
 582               ...)
 583 {
 584   GObject *object;
 585   va_list var_args;
 586
 587   g_return_val_if_fail (G_TYPE_IS_OBJECT (object_type), NULL);
 588
 589   va_start (var_args, first_property_name);
 590   object = g_object_new_valist (object_type, first_property_name, var_args);
 591   va_end (var_args);
 592
 593   return object;
 594 }
 595
 596 gpointer
 597 g_object_newv (GType       object_type,
 598                guint       n_parameters,
 599                GParameter *parameters)
 600 {
 601   GObjectConstructParam *cparams, *oparams;
 602   GObjectNotifyQueue *nqueue;
 603   GObject *object;
 604   GObjectClass *class;
 605   GSList *slist;
 606   guint n_total_cparams = 0, n_cparams = 0, n_oparams = 0, n_cvalues;
 607   GValue *cvalues;
 608   GList *clist = NULL;
 609   guint i;
 610
 611   g_return_val_if_fail (G_TYPE_IS_OBJECT (object_type), NULL);
 612
 613   class = g_type_class_ref (object_type);
 614   for (slist = class->construct_properties; slist; slist = slist->next)
 615     {
 616       clist = g_list_prepend (clist, slist->data);
 617       n_total_cparams += 1;
 618     }
 619
 620   /* collect parameters, sort into construction and normal ones */
 621   oparams = g_new (GObjectConstructParam, n_parameters);
 622   cparams = g_new (GObjectConstructParam, n_total_cparams);
 623   for (i = 0; i < n_parameters; i++)
 624     {
 625       GValue *value = &parameters[i].value;
 626       GParamSpec *pspec = g_param_spec_pool_lookup (pspec_pool,
 627                                                     parameters[i].name,
 628                                                     object_type,
 629                                                     TRUE);
 630       if (!pspec)
 631         {
 632           g_warning ("%s: object class `%s' has no property named `%s'",
 633                      G_STRLOC,
 634                      g_type_name (object_type),
 635                      parameters[i].name);
 636           continue;
 637         }
 638       if (!(pspec->flags & G_PARAM_WRITABLE))
 639         {
 640           g_warning ("%s: property `%s' of object class `%s' is not writable",
 641                      G_STRLOC,
 642                      pspec->name,
 643                      g_type_name (object_type));
 644           continue;
 645         }
 646       if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
 647         {
 648           GList *list = g_list_find (clist, pspec);
 649
 650           if (!list)
 651             {
 652               g_warning (G_STRLOC ": construct property \"%s\" for object `%s' can't be set twice",
 653                          pspec->name, g_type_name (object_type));
 654               continue;
 655             }
 656           cparams[n_cparams].pspec = pspec;
 657           cparams[n_cparams].value = value;
 658           n_cparams++;
 659           if (!list->prev)
 660             clist = list->next;
 661           else
 662             list->prev->next = list->next;
 663           if (list->next)
 664             list->next->prev = list->prev;
 665           g_list_free_1 (list);
 666         }
 667       else
 668         {
 669           oparams[n_oparams].pspec = pspec;
 670           oparams[n_oparams].value = value;
 671           n_oparams++;
 672         }
 673     }
 674
 675   /* set remaining construction properties to default values */
 676   n_cvalues = n_total_cparams - n_cparams;
 677   cvalues = g_new (GValue, n_cvalues);
 678   while (clist)
 679     {
 680       GList *tmp = clist->next;
 681       GParamSpec *pspec = clist->data;
 682       GValue *value = cvalues + n_total_cparams - n_cparams - 1;
 683
 684       value->g_type = 0;
 685       g_value_init (value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 686       g_param_value_set_default (pspec, value);
 687
 688       cparams[n_cparams].pspec = pspec;
 689       cparams[n_cparams].value = value;
 690       n_cparams++;
 691
 692       g_list_free_1 (clist);
 693       clist = tmp;
 694     }
 695
 696   /* construct object from construction parameters */
 697   object = class->constructor (object_type, n_total_cparams, cparams);
 698
 699   /* free construction values */
 700   g_free (cparams);
 701   while (n_cvalues--)
 702     g_value_unset (cvalues + n_cvalues);
 703   g_free (cvalues);
 704
 705   /* release g_object_init() notification queue freeze_count */
 706   nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
 707   g_object_notify_queue_thaw (object, nqueue);
 708
 709   /* set remaining properties */
 710   for (i = 0; i < n_oparams; i++)
 711     object_set_property (object, oparams[i].pspec, oparams[i].value, nqueue);
 712   g_free (oparams);
 713
 714   g_type_class_unref (class);
 715
 716   /* release our own freeze count and handle notifications */
 717   g_object_notify_queue_thaw (object, nqueue);
 718
 719   return object;
 720 }
 721
 722 gpointer
 723 g_object_new_valist (GType        object_type,
 724                      const gchar *first_property_name,
 725                      va_list      var_args)
 726 {
 727   GObjectClass *class;
 728   GParameter *params;
 729   const gchar *name;
 730   GObject *object;
 731   guint n_params = 0, n_alloced_params = 16;
 732
 733   g_return_val_if_fail (G_TYPE_IS_OBJECT (object_type), NULL);
 734
 735   if (!first_property_name)
 736     return g_object_newv (object_type, 0, NULL);
 737
 738   class = g_type_class_ref (object_type);
 739
 740   params = g_new (GParameter, n_alloced_params);
 741   name = first_property_name;
 742   while (name)
 743     {
 744       gchar *error = NULL;
 745       GParamSpec *pspec = g_param_spec_pool_lookup (pspec_pool,
 746                                                     name,
 747                                                     object_type,
 748                                                     TRUE);
 749       if (!pspec)
 750         {
 751           g_warning ("%s: object class `%s' has no property named `%s'",
 752                      G_STRLOC,
 753                      g_type_name (object_type),
 754                      name);
 755           break;
 756         }
 757       if (n_params >= n_alloced_params)
 758         {
 759           n_alloced_params += 16;
 760           params = g_renew (GParameter, params, n_alloced_params);
 761         }
 762       params[n_params].name = name;
 763       params[n_params].value.g_type = 0;
 764       g_value_init (&params[n_params].value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 765       G_VALUE_COLLECT (&params[n_params].value, var_args, 0, &error);
 766       if (error)
 767         {
 768           g_warning ("%s: %s", G_STRLOC, error);
 769           g_free (error);
 770
 771           /* we purposely leak the value here, it might not be
 772            * in a sane state if an error condition occoured
 773            */
 774           break;
 775         }
 776       n_params++;
 777       name = va_arg (var_args, gchar*);
 778     }
 779
 780   object = g_object_newv (object_type, n_params, params);
 781
 782   while (n_params--)
 783     g_value_unset (&params[n_params].value);
 784   g_free (params);
 785
 786   g_type_class_unref (class);
 787
 788   return object;
 789 }
 790
 791 static GObject*
 792 g_object_constructor (GType                  type,
 793                       guint                  n_construct_properties,
 794                       GObjectConstructParam *construct_params)
 795 {
 796   GObject *object;
 797
 798   /* create object */
 799   object = (GObject*) g_type_create_instance (type);
 800
 801   /* set construction parameters */
 802   if (n_construct_properties)
 803     {
 804       GObjectNotifyQueue *nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
 805
 806       /* set construct properties */
 807       while (n_construct_properties--)
 808         {
 809           GValue *value = construct_params->value;
 810           GParamSpec *pspec = construct_params->pspec;
 811
 812           construct_params++;
 813           object_set_property (object, pspec, value, nqueue);
 814         }
 815       g_object_notify_queue_thaw (object, nqueue);
 816       /* the notification queue is still frozen from g_object_init(), so
 817        * we don't need to handle it here, g_object_newv() takes
 818        * care of that
 819        */
 820     }
 821
 822   return object;
 823 }
 824
 825 void
 826 g_object_set_valist (GObject     *object,
 827                      const gchar *first_property_name,
 828                      va_list      var_args)
 829 {
 830   GObjectNotifyQueue *nqueue;
 831   const gchar *name;
 832
 833   g_return_if_fail (G_IS_OBJECT (object));
 834
 835   g_object_ref (object);
 836   nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
 837
 838   name = first_property_name;
 839   while (name)
 840     {
 841       GValue value = { 0, };
 842       GParamSpec *pspec;
 843       gchar *error = NULL;
 844
 845       pspec = g_param_spec_pool_lookup (pspec_pool,
 846                                         name,
 847                                         G_OBJECT_TYPE (object),
 848                                         TRUE);
 849       if (!pspec)
 850         {
 851           g_warning ("%s: object class `%s' has no property named `%s'",
 852                      G_STRLOC,
 853                      G_OBJECT_TYPE_NAME (object),
 854                      name);
 855           break;
 856         }
 857       if (!(pspec->flags & G_PARAM_WRITABLE))
 858         {
 859           g_warning ("%s: property `%s' of object class `%s' is not writable",
 860                      G_STRLOC,
 861                      pspec->name,
 862                      G_OBJECT_TYPE_NAME (object));
 863           break;
 864         }
 865
 866       g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 867
 868       G_VALUE_COLLECT (&value, var_args, 0, &error);
 869       if (error)
 870         {
 871           g_warning ("%s: %s", G_STRLOC, error);
 872           g_free (error);
 873
 874           /* we purposely leak the value here, it might not be
 875            * in a sane state if an error condition occoured
 876            */
 877           break;
 878         }
 879
 880       object_set_property (object, pspec, &value, nqueue);
 881       g_value_unset (&value);
 882
 883       name = va_arg (var_args, gchar*);
 884     }
 885
 886   g_object_notify_queue_thaw (object, nqueue);
 887   g_object_unref (object);
 888 }
 889
 890 void
 891 g_object_get_valist (GObject     *object,
 892                      const gchar *first_property_name,
 893                      va_list      var_args)
 894 {
 895   const gchar *name;
 896
 897   g_return_if_fail (G_IS_OBJECT (object));
 898
 899   g_object_ref (object);
 900
 901   name = first_property_name;
 902
 903   while (name)
 904     {
 905       GValue value = { 0, };
 906       GParamSpec *pspec;
 907       gchar *error;
 908
 909       pspec = g_param_spec_pool_lookup (pspec_pool,
 910                                         name,
 911                                         G_OBJECT_TYPE (object),
 912                                         TRUE);
 913       if (!pspec)
 914         {
 915           g_warning ("%s: object class `%s' has no property named `%s'",
 916                      G_STRLOC,
 917                      G_OBJECT_TYPE_NAME (object),
 918                      name);
 919           break;
 920         }
 921       if (!(pspec->flags & G_PARAM_READABLE))
 922         {
 923           g_warning ("%s: property `%s' of object class `%s' is not readable",
 924                      G_STRLOC,
 925                      pspec->name,
 926                      G_OBJECT_TYPE_NAME (object));
 927           break;
 928         }
 929
 930       g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 931
 932       object_get_property (object, pspec, &value);
 933
 934       G_VALUE_LCOPY (&value, var_args, 0, &error);
 935       if (error)
 936         {
 937           g_warning ("%s: %s", G_STRLOC, error);
 938           g_free (error);
 939           g_value_unset (&value);
 940           break;
 941         }
 942
 943       g_value_unset (&value);
 944
 945       name = va_arg (var_args, gchar*);
 946     }
 947
 948   g_object_unref (object);
 949 }
 950
 951 gpointer
 952 g_object_set (gpointer     _object,
 953               const gchar *first_property_name,
 954               ...)
 955 {
 956   GObject *object = _object;
 957   va_list var_args;
 958
 959   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
 960
 961   va_start (var_args, first_property_name);
 962   g_object_set_valist (object, first_property_name, var_args);
 963   va_end (var_args);
 964
 965   return object;
 966 }
 967
 968 void
 969 g_object_get (gpointer     _object,
 970               const gchar *first_property_name,
 971               ...)
 972 {
 973   GObject *object = _object;
 974   va_list var_args;
 975
 976   g_return_if_fail (G_IS_OBJECT (object));
 977
 978   va_start (var_args, first_property_name);
 979   g_object_get_valist (object, first_property_name, var_args);
 980   va_end (var_args);
 981 }
 982
 983 void
 984 g_object_set_property (GObject      *object,
 985                        const gchar  *property_name,
 986                        const GValue *value)
 987 {
 988   GObjectNotifyQueue *nqueue;
 989   GParamSpec *pspec;
 990
 991   g_return_if_fail (G_IS_OBJECT (object));
 992   g_return_if_fail (property_name != NULL);
 993   g_return_if_fail (G_IS_VALUE (value));
 994
 995   g_object_ref (object);
 996   nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
 997
 998   pspec = g_param_spec_pool_lookup (pspec_pool,
 999                                     property_name,
1000                                     G_OBJECT_TYPE (object),
1001                                     TRUE);
1002   if (!pspec)
1003     g_warning ("%s: object class `%s' has no property named `%s'",
1004                G_STRLOC,
1005                G_OBJECT_TYPE_NAME (object),
1006                property_name);
1007   else
1008     object_set_property (object, pspec, value, nqueue);
1009
1010   g_object_notify_queue_thaw (object, nqueue);
1011   g_object_unref (object);
1012 }
1013
1014 void
1015 g_object_get_property (GObject     *object,
1016                        const gchar *property_name,
1017                        GValue      *value)
1018 {
1019   GParamSpec *pspec;
1020
1021   g_return_if_fail (G_IS_OBJECT (object));
1022   g_return_if_fail (property_name != NULL);
1023   g_return_if_fail (G_IS_VALUE (value));
1024
1025   g_object_ref (object);
1026
1027   pspec = g_param_spec_pool_lookup (pspec_pool,
1028                                     property_name,
1029                                     G_OBJECT_TYPE (object),
1030                                     TRUE);
1031   if (!pspec)
1032     g_warning ("%s: object class `%s' has no property named `%s'",
1033                G_STRLOC,
1034                G_OBJECT_TYPE_NAME (object),
1035                property_name);
1036   else
1037     {
1038       GValue *prop_value, tmp_value = { 0, };
1039
1040       /* auto-conversion of the callers value type
1041        */
1042       if (G_VALUE_TYPE (value) == G_PARAM_SPEC_VALUE_TYPE (pspec))
1043         {
1044           g_value_reset (value);
1045           prop_value = value;
1046         }
1047       else if (!g_value_type_transformable (G_PARAM_SPEC_VALUE_TYPE (pspec), G_VALUE_TYPE (value)))
1048         {
1049           g_warning ("can't retrive property `%s' of type `%s' as value of type `%s'",
1050                      pspec->name,
1051                      g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
1052                      G_VALUE_TYPE_NAME (value));
1053           g_object_unref (object);
1054           return;
1055         }
1056       else
1057         {
1058           g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
1059           prop_value = &tmp_value;
1060         }
1061       object_get_property (object, pspec, prop_value);
1062       if (prop_value != value)
1063         {
1064           g_value_transform (prop_value, value);
1065           g_value_unset (&tmp_value);
1066         }
1067     }
1068
1069   g_object_unref (object);
1070 }
1071
1072 gpointer
1073 g_object_connect (gpointer     _object,
1074                   const gchar *signal_spec,
1075                   ...)
1076 {
1077   GObject *object = _object;
1078   va_list var_args;
1079
1080   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1081   g_return_val_if_fail (object->ref_count > 0, object);
1082
1083   va_start (var_args, signal_spec);
1084   while (signal_spec)
1085     {
1086       gpointer callback = va_arg (var_args, gpointer);
1087       gpointer data = va_arg (var_args, gpointer);
1088       gulong sid;
1089
1090       if (strncmp (signal_spec, "signal::", 8) == 0)
1091         sid = g_signal_connect_data (object, signal_spec + 8,
1092                                      callback, data, NULL,
1093                                      0);
1094       else if (strncmp (signal_spec, "object_signal::", 15) == 0)
1095         sid = g_signal_connect_object (object, signal_spec + 15,
1096                                        callback, data,
1097                                        0);
1098       else if (strncmp (signal_spec, "swapped_signal::", 16) == 0)
1099         sid = g_signal_connect_data (object, signal_spec + 16,
1100                                      callback, data, NULL,
1101                                      G_CONNECT_SWAPPED);
1102       else if (strncmp (signal_spec, "swapped_object_signal::", 23) == 0)
1103         sid = g_signal_connect_object (object, signal_spec + 23,
1104                                        callback, data,
1105                                        G_CONNECT_SWAPPED);
1106       else if (strncmp (signal_spec, "signal_after::", 14) == 0)
1107         sid = g_signal_connect_data (object, signal_spec + 14,
1108                                      callback, data, NULL,
1109                                      G_CONNECT_AFTER);
1110       else if (strncmp (signal_spec, "object_signal_after::", 21) == 0)
1111         sid = g_signal_connect_object (object, signal_spec + 21,
1112                                        callback, data,
1113                                        G_CONNECT_AFTER);
1114       else if (strncmp (signal_spec, "swapped_signal_after::", 22) == 0)
1115         sid = g_signal_connect_data (object, signal_spec + 22,
1116                                      callback, data, NULL,
1117                                      G_CONNECT_SWAPPED | G_CONNECT_AFTER);
1118       else if (strncmp (signal_spec, "swapped_object_signal_after::", 29) == 0)
1119         sid = g_signal_connect_object (object, signal_spec + 29,
1120                                        callback, data,
1121                                        G_CONNECT_SWAPPED | G_CONNECT_AFTER);
1122       else
1123         {
1124           g_warning ("%s: invalid signal spec \"%s\"", G_STRLOC, signal_spec);
1125           break;
1126         }
1127       signal_spec = va_arg (var_args, gchar*);
1128     }
1129   va_end (var_args);
1130
1131   return object;
1132 }
1133
1134 gpointer
1135 g_object_disconnect (gpointer     _object,
1136                      const gchar *signal_spec,
1137                      ...)
1138 {
1139   GObject *object = _object;
1140   va_list var_args;
1141
1142   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1143   g_return_val_if_fail (object->ref_count > 0, object);
1144
1145   va_start (var_args, signal_spec);
1146   while (signal_spec)
1147     {
1148       gpointer callback = va_arg (var_args, gpointer);
1149       gpointer data = va_arg (var_args, gpointer);
1150       guint sid = 0, detail = 0, mask = 0;
1151
1152       if (strncmp (signal_spec, "any_signal::", 12) == 0)
1153         {
1154           signal_spec += 12;
1155           mask = G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA;
1156         }
1157       else if (strcmp (signal_spec, "any_signal") == 0)
1158         {
1159           signal_spec += 10;
1160           mask = G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA;
1161         }
1162       else
1163         {
1164           g_warning ("%s: invalid signal spec \"%s\"", G_STRLOC, signal_spec);
1165           break;
1166         }
1167
1168       if ((mask & G_SIGNAL_MATCH_ID) &&
1169           !g_signal_parse_name (signal_spec, G_OBJECT_TYPE (object), &sid, &detail, FALSE))
1170         g_warning ("%s: invalid signal name \"%s\"", G_STRLOC, signal_spec);
1171       else if (!g_signal_handlers_disconnect_matched (object, mask | (detail ? G_SIGNAL_MATCH_DETAIL : 0),
1172                                                       sid, detail,
1173                                                       NULL, callback, data))
1174         g_warning (G_STRLOC ": signal handler %p(%p) is not connected", callback, data);
1175       signal_spec = va_arg (var_args, gchar*);
1176     }
1177   va_end (var_args);
1178
1179   return object;
1180 }
1181
1182 typedef struct {
1183   guint n_weak_refs;
1184   struct {
1185     GWeakNotify notify;
1186     gpointer    data;
1187   } weak_refs[1];  /* flexible array */
1188 } WeakRefStack;
1189
1190 static void
1191 weak_refs_notify (gpointer data)
1192 {
1193   WeakRefStack *wstack = data;
1194   guint i;
1195
1196   for (i = 0; i < wstack->n_weak_refs; i++)
1197     wstack->weak_refs[i].notify (wstack->weak_refs[i].data);
1198   g_free (wstack);
1199 }
1200
1201 void
1202 g_object_weak_ref (GObject    *object,
1203                    GWeakNotify notify,
1204                    gpointer    data)
1205 {
1206   WeakRefStack *wstack;
1207   guint i;
1208
1209   g_return_if_fail (G_IS_OBJECT (object));
1210   g_return_if_fail (notify != NULL);
1211   g_return_if_fail (object->ref_count >= 1);
1212
1213   wstack = g_datalist_id_remove_no_notify (&object->qdata, quark_weak_refs);
1214   if (wstack)
1215     {
1216       i = wstack->n_weak_refs++;
1217       wstack = g_realloc (wstack, sizeof (*wstack) + sizeof (wstack->weak_refs[0]) * i);
1218     }
1219   else
1220     {
1221       wstack = g_renew (WeakRefStack, NULL, 1);
1222       wstack->n_weak_refs = 1;
1223       i = wstack->n_weak_refs;
1224     }
1225   wstack->weak_refs[i].notify = notify;
1226   wstack->weak_refs[i].data = data;
1227   g_datalist_id_set_data_full (&object->qdata, quark_weak_refs, wstack, weak_refs_notify);
1228 }
1229
1230 void
1231 g_object_weak_unref (GObject    *object,
1232                      GWeakNotify notify,
1233                      gpointer    data)
1234 {
1235   WeakRefStack *wstack;
1236   gboolean found_one = FALSE;
1237
1238   g_return_if_fail (G_IS_OBJECT (object));
1239   g_return_if_fail (notify != NULL);
1240
1241   wstack = g_datalist_id_get_data (&object->qdata, quark_weak_refs);
1242   if (wstack)
1243     {
1244       guint i;
1245
1246       for (i = 0; i < wstack->n_weak_refs; i++)
1247         if (wstack->weak_refs[i].notify == notify &&
1248             wstack->weak_refs[i].data == data)
1249           {
1250             found_one = TRUE;
1251             wstack->n_weak_refs -= 1;
1252             if (i != wstack->n_weak_refs)
1253               {
1254                 wstack->weak_refs[i].notify = wstack->weak_refs[wstack->n_weak_refs].notify;
1255                 wstack->weak_refs[i].data = wstack->weak_refs[wstack->n_weak_refs].data;
1256               }
1257             break;
1258           }
1259     }
1260   if (!found_one)
1261     g_warning (G_STRLOC ": couldn't find weak ref %p(%p)", notify, data);
1262 }
1263
1264 gpointer
1265 g_object_ref (gpointer _object)
1266 {
1267   GObject *object = _object;
1268
1269   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1270   g_return_val_if_fail (object->ref_count > 0, NULL);
1271
1272 #ifdef  G_ENABLE_DEBUG
1273   if (g_trap_object_ref == object)
1274     G_BREAKPOINT ();
1275 #endif  /* G_ENABLE_DEBUG */
1276
1277   object->ref_count += 1;
1278
1279   return object;
1280 }
1281
1282 void
1283 g_object_unref (gpointer _object)
1284 {
1285   GObject *object = _object;
1286
1287   g_return_if_fail (G_IS_OBJECT (object));
1288   g_return_if_fail (object->ref_count > 0);
1289
1290 #ifdef  G_ENABLE_DEBUG
1291   if (g_trap_object_ref == object)
1292     G_BREAKPOINT ();
1293 #endif  /* G_ENABLE_DEBUG */
1294
1295   if (object->ref_count > 1)
1296     object->ref_count -= 1;
1297   else
1298     g_object_last_unref (object);
1299 }
1300
1301 gpointer
1302 g_object_get_qdata (GObject *object,
1303                     GQuark   quark)
1304 {
1305   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1306
1307   return quark ? g_datalist_id_get_data (&object->qdata, quark) : NULL;
1308 }
1309
1310 void
1311 g_object_set_qdata (GObject *object,
1312                     GQuark   quark,
1313                     gpointer data)
1314 {
1315   g_return_if_fail (G_IS_OBJECT (object));
1316   g_return_if_fail (quark > 0);
1317
1318   g_datalist_id_set_data (&object->qdata, quark, data);
1319 }
1320
1321 void
1322 g_object_set_qdata_full (GObject       *object,
1323                          GQuark         quark,
1324                          gpointer       data,
1325                          GDestroyNotify destroy)
1326 {
1327   g_return_if_fail (G_IS_OBJECT (object));
1328   g_return_if_fail (quark > 0);
1329
1330   g_datalist_id_set_data_full (&object->qdata, quark, data,
1331                                data ? destroy : (GDestroyNotify) NULL);
1332 }
1333
1334 gpointer
1335 g_object_steal_qdata (GObject *object,
1336                       GQuark   quark)
1337 {
1338   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1339   g_return_val_if_fail (quark > 0, NULL);
1340
1341   return g_datalist_id_remove_no_notify (&object->qdata, quark);
1342 }
1343
1344 gpointer
1345 g_object_get_data (GObject     *object,
1346                    const gchar *key)
1347 {
1348   GQuark quark;
1349
1350   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1351   g_return_val_if_fail (key != NULL, NULL);
1352
1353   quark = g_quark_try_string (key);
1354
1355   return quark ? g_datalist_id_get_data (&object->qdata, quark) : NULL;
1356 }
1357
1358 void
1359 g_object_set_data (GObject     *object,
1360                    const gchar *key,
1361                    gpointer     data)
1362 {
1363   g_return_if_fail (G_IS_OBJECT (object));
1364   g_return_if_fail (key != NULL);
1365
1366   g_datalist_id_set_data (&object->qdata, g_quark_from_string (key), data);
1367 }
1368
1369 void
1370 g_object_set_data_full (GObject       *object,
1371                         const gchar   *key,
1372                         gpointer       data,
1373                         GDestroyNotify destroy)
1374 {
1375   g_return_if_fail (G_IS_OBJECT (object));
1376   g_return_if_fail (key != NULL);
1377
1378   g_datalist_id_set_data_full (&object->qdata, g_quark_from_string (key), data,
1379                                data ? destroy : (GDestroyNotify) NULL);
1380 }
1381
1382 gpointer
1383 g_object_steal_data (GObject     *object,
1384                      const gchar *key)
1385 {
1386   GQuark quark;
1387
1388   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1389   g_return_val_if_fail (key != NULL, NULL);
1390
1391   quark = g_quark_try_string (key);
1392
1393   return quark ? g_datalist_id_remove_no_notify (&object->qdata, quark) : NULL;
1394 }
1395
1396 static void
1397 g_value_object_init (GValue *value)
1398 {
1399   value->data[0].v_pointer = NULL;
1400 }
1401
1402 static void
1403 g_value_object_free_value (GValue *value)
1404 {
1405   if (value->data[0].v_pointer)
1406     g_object_unref (value->data[0].v_pointer);
1407 }
1408
1409 static void
1410 g_value_object_copy_value (const GValue *src_value,
1411                            GValue       *dest_value)
1412 {
1413   if (src_value->data[0].v_pointer)
1414     dest_value->data[0].v_pointer = g_object_ref (src_value->data[0].v_pointer);
1415   else
1416     dest_value->data[0].v_pointer = NULL;
1417 }
1418
1419 static void
1420 g_value_object_transform_value (const GValue *src_value,
1421                                 GValue       *dest_value)
1422 {
1423   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)))
1424     dest_value->data[0].v_pointer = g_object_ref (src_value->data[0].v_pointer);
1425   else
1426     dest_value->data[0].v_pointer = NULL;
1427 }
1428
1429 static gpointer
1430 g_value_object_peek_pointer (const GValue *value)
1431 {
1432   return value->data[0].v_pointer;
1433 }
1434
1435 static gchar*
1436 g_value_object_collect_value (GValue      *value,
1437                               guint        n_collect_values,
1438                               GTypeCValue *collect_values,
1439                               guint        collect_flags)
1440 {
1441   if (collect_values[0].v_pointer)
1442     {
1443       GObject *object = collect_values[0].v_pointer;
1444
1445       if (object->g_type_instance.g_class == NULL)
1446         return g_strconcat ("invalid unclassed object pointer for value type `",
1447                             G_VALUE_TYPE_NAME (value),
1448                             "'",
1449                             NULL);
1450       else if (!g_value_type_compatible (G_OBJECT_TYPE (object), G_VALUE_TYPE (value)))
1451         return g_strconcat ("invalid object type `",
1452                             G_OBJECT_TYPE_NAME (object),
1453                             "' for value type `",
1454                             G_VALUE_TYPE_NAME (value),
1455                             "'",
1456                             NULL);
1457       /* never honour G_VALUE_NOCOPY_CONTENTS for ref-counted types */
1458       value->data[0].v_pointer = g_object_ref (object);
1459     }
1460   else
1461     value->data[0].v_pointer = NULL;
1462
1463   return NULL;
1464 }
1465
1466 static gchar*
1467 g_value_object_lcopy_value (const GValue *value,
1468                             guint        n_collect_values,
1469                             GTypeCValue *collect_values,
1470                             guint        collect_flags)
1471 {
1472   GObject **object_p = collect_values[0].v_pointer;
1473
1474   if (!object_p)
1475     return g_strdup_printf ("value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value));
1476
1477   if (!value->data[0].v_pointer)
1478     *object_p = NULL;
1479   else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
1480     *object_p = value->data[0].v_pointer;
1481   else
1482     *object_p = g_object_ref (value->data[0].v_pointer);
1483
1484   return NULL;
1485 }
1486
1487 void
1488 g_value_set_object (GValue   *value,
1489                     gpointer  v_object)
1490 {
1491   g_return_if_fail (G_VALUE_HOLDS_OBJECT (value));
1492
1493   if (value->data[0].v_pointer)
1494     {
1495       g_object_unref (value->data[0].v_pointer);
1496       value->data[0].v_pointer = NULL;
1497     }
1498
1499   if (v_object)
1500     {
1501       g_return_if_fail (G_IS_OBJECT (v_object));
1502       g_return_if_fail (g_value_type_compatible (G_OBJECT_TYPE (v_object), G_VALUE_TYPE (value)));
1503
1504       value->data[0].v_pointer = v_object;
1505       g_object_ref (value->data[0].v_pointer);
1506     }
1507 }
1508
1509 gpointer
1510 g_value_get_object (const GValue *value)
1511 {
1512   g_return_val_if_fail (G_VALUE_HOLDS_OBJECT (value), NULL);
1513
1514   return value->data[0].v_pointer;
1515 }
1516
1517 GObject*
1518 g_value_dup_object (const GValue *value)
1519 {
1520   g_return_val_if_fail (G_VALUE_HOLDS_OBJECT (value), NULL);
1521
1522   return value->data[0].v_pointer ? g_object_ref (value->data[0].v_pointer) : NULL;
1523 }
1524
1525 guint
1526 g_signal_connect_object (gpointer      instance,
1527                          const gchar  *detailed_signal,
1528                          GCallback     c_handler,
1529                          gpointer      gobject,
1530                          GConnectFlags connect_flags)
1531 {
1532   g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
1533   g_return_val_if_fail (detailed_signal != NULL, 0);
1534   g_return_val_if_fail (c_handler != NULL, 0);
1535
1536   if (gobject)
1537     {
1538       GClosure *closure;
1539
1540       g_return_val_if_fail (G_IS_OBJECT (gobject), 0);
1541
1542       closure = ((connect_flags & G_CONNECT_SWAPPED) ? g_cclosure_new_object_swap : g_cclosure_new_object) (c_handler, gobject);
1543
1544       return g_signal_connect_closure (instance, detailed_signal, closure, connect_flags & G_CONNECT_AFTER);
1545     }
1546   else
1547     return g_signal_connect_data (instance, detailed_signal, c_handler, NULL, NULL, connect_flags);
1548 }
1549
1550 typedef struct {
1551   GObject  *object;
1552   guint     n_closures;
1553   GClosure *closures[1]; /* flexible array */
1554 } CArray;
1555
1556 static void
1557 object_remove_closure (gpointer  data,
1558                        GClosure *closure)
1559 {
1560   GObject *object = data;
1561   CArray *carray = g_object_get_qdata (object, quark_closure_array);
1562   guint i;
1563
1564   for (i = 0; i < carray->n_closures; i++)
1565     if (carray->closures[i] == closure)
1566       {
1567         carray->n_closures--;
1568         if (i < carray->n_closures)
1569           carray->closures[i] = carray->closures[carray->n_closures];
1570         return;
1571       }
1572   g_assert_not_reached ();
1573 }
1574
1575 static void
1576 destroy_closure_array (gpointer data)
1577 {
1578   CArray *carray = data;
1579   GObject *object = carray->object;
1580   guint i, n = carray->n_closures;
1581
1582   for (i = 0; i < n; i++)
1583     {
1584       GClosure *closure = carray->closures[i];
1585
1586       /* removing object_remove_closure() upfront is probably faster than
1587        * letting it fiddle with quark_closure_array which is empty anyways
1588        */
1589       g_closure_remove_invalidate_notifier (closure, object, object_remove_closure);
1590       g_closure_invalidate (closure);
1591     }
1592   g_free (carray);
1593 }
1594
1595 void
1596 g_object_watch_closure (GObject  *object,
1597                         GClosure *closure)
1598 {
1599   CArray *carray;
1600   guint i;
1601
1602   g_return_if_fail (G_IS_OBJECT (object));
1603   g_return_if_fail (closure != NULL);
1604   g_return_if_fail (closure->is_invalid == FALSE);
1605   g_return_if_fail (closure->in_marshal == FALSE);
1606   g_return_if_fail (object->ref_count > 0);     /* this doesn't work on finalizing objects */
1607
1608   g_closure_add_invalidate_notifier (closure, object, object_remove_closure);
1609   g_closure_add_marshal_guards (closure,
1610                                 object, (GClosureNotify) g_object_ref,
1611                                 object, (GClosureNotify) g_object_unref);
1612   carray = g_datalist_id_remove_no_notify (&object->qdata, quark_closure_array);
1613   if (!carray)
1614     {
1615       carray = g_renew (CArray, NULL, 1);
1616       carray->object = object;
1617       carray->n_closures = 1;
1618       i = carray->n_closures;
1619     }
1620   else
1621     {
1622       i = carray->n_closures++;
1623       carray = g_realloc (carray, sizeof (*carray) + sizeof (carray->closures[0]) * i);
1624     }
1625   carray->closures[i] = closure;
1626   g_datalist_id_set_data_full (&object->qdata, quark_closure_array, carray, destroy_closure_array);
1627 }
1628
1629 GClosure*
1630 g_closure_new_object (guint    sizeof_closure,
1631                       GObject *object)
1632 {
1633   GClosure *closure;
1634
1635   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1636   g_return_val_if_fail (object->ref_count > 0, NULL);     /* this doesn't work on finalizing objects */
1637
1638   closure = g_closure_new_simple (sizeof_closure, object);
1639   g_object_watch_closure (object, closure);
1640
1641   return closure;
1642 }
1643
1644 GClosure*
1645 g_cclosure_new_object (GCallback callback_func,
1646                        gpointer  _object)
1647 {
1648   GObject *object = _object;
1649   GClosure *closure;
1650
1651   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1652   g_return_val_if_fail (object->ref_count > 0, NULL);     /* this doesn't work on finalizing objects */
1653   g_return_val_if_fail (callback_func != NULL, NULL);
1654
1655   closure = g_cclosure_new (callback_func, object, NULL);
1656   g_object_watch_closure (object, closure);
1657
1658   return closure;
1659 }
1660
1661 GClosure*
1662 g_cclosure_new_object_swap (GCallback callback_func,
1663                             gpointer  _object)
1664 {
1665   GObject *object = _object;
1666   GClosure *closure;
1667
1668   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1669   g_return_val_if_fail (object->ref_count > 0, NULL);     /* this doesn't work on finalizing objects */
1670   g_return_val_if_fail (callback_func != NULL, NULL);
1671
1672   closure = g_cclosure_new_swap (callback_func, object, NULL);
1673   g_object_watch_closure (object, closure);
1674
1675   return closure;
1676 }