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 #include        <signal.h>
  32
  33
  34 #define PREALLOC_CPARAMS        (8)
  35
  36
  37 /* --- macros --- */
  38 #define PARAM_SPEC_PARAM_ID(pspec)              ((pspec)->param_id)
  39 #define PARAM_SPEC_SET_PARAM_ID(pspec, id)      ((pspec)->param_id = (id))
  40
  41
  42 /* --- signals --- */
  43 enum {
  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 /* --- variables --- */
 102 static GQuark               quark_closure_array = 0;
 103 static GQuark               quark_weak_refs = 0;
 104 static GParamSpecPool      *pspec_pool = NULL;
 105 static GObjectNotifyContext property_notify_context = { 0, };
 106 static gulong               gobject_signals[LAST_SIGNAL] = { 0, };
 107
 108
 109 /* --- functions --- */
 110 #ifdef  G_ENABLE_DEBUG
 111 #define IF_DEBUG(debug_type)    if (_g_type_debug_flags & G_TYPE_DEBUG_ ## debug_type)
 112 G_LOCK_DEFINE_STATIC     (debug_objects);
 113 static volatile GObject *g_trap_object_ref = NULL;
 114 static guint             debug_objects_count = 0;
 115 static GHashTable       *debug_objects_ht = NULL;
 116 static void
 117 debug_objects_foreach (gpointer key,
 118                        gpointer value,
 119                        gpointer user_data)
 120 {
 121   GObject *object = value;
 122
 123   g_message ("[%p] stale %s\tref_count=%u",
 124              object,
 125              G_OBJECT_TYPE_NAME (object),
 126              object->ref_count);
 127 }
 128 static void
 129 debug_objects_atexit (void)
 130 {
 131   IF_DEBUG (OBJECTS)
 132     {
 133       G_LOCK (debug_objects);
 134       g_message ("stale GObjects: %u", debug_objects_count);
 135       g_hash_table_foreach (debug_objects_ht, debug_objects_foreach, NULL);
 136       G_UNLOCK (debug_objects);
 137     }
 138 }
 139 #endif  /* G_ENABLE_DEBUG */
 140
 141 void
 142 g_object_type_init (void)       /* sync with gtype.c */
 143 {
 144   static gboolean initialized = FALSE;
 145   static const GTypeFundamentalInfo finfo = {
 146     G_TYPE_FLAG_CLASSED | G_TYPE_FLAG_INSTANTIATABLE | G_TYPE_FLAG_DERIVABLE | G_TYPE_FLAG_DEEP_DERIVABLE,
 147   };
 148   static GTypeInfo info = {
 149     sizeof (GObjectClass),
 150     (GBaseInitFunc) g_object_base_class_init,
 151     (GBaseFinalizeFunc) g_object_base_class_finalize,
 152     (GClassInitFunc) g_object_do_class_init,
 153     NULL        /* class_destroy */,
 154     NULL        /* class_data */,
 155     sizeof (GObject),
 156     0           /* n_preallocs */,
 157     (GInstanceInitFunc) g_object_init,
 158     NULL,       /* value_table */
 159   };
 160   static const GTypeValueTable value_table = {
 161     g_value_object_init,          /* value_init */
 162     g_value_object_free_value,    /* value_free */
 163     g_value_object_copy_value,    /* value_copy */
 164     g_value_object_peek_pointer,  /* value_peek_pointer */
 165     "p",                          /* collect_format */
 166     g_value_object_collect_value, /* collect_value */
 167     "p",                          /* lcopy_format */
 168     g_value_object_lcopy_value,   /* lcopy_value */
 169   };
 170   GType type;
 171
 172   g_return_if_fail (initialized == FALSE);
 173   initialized = TRUE;
 174
 175   /* G_TYPE_OBJECT
 176    */
 177   info.value_table = &value_table;
 178   type = g_type_register_fundamental (G_TYPE_OBJECT, "GObject", &info, &finfo, 0);
 179   g_assert (type == G_TYPE_OBJECT);
 180   g_value_register_transform_func (G_TYPE_OBJECT, G_TYPE_OBJECT, g_value_object_transform_value);
 181
 182 #ifdef  G_ENABLE_DEBUG
 183   IF_DEBUG (OBJECTS)
 184     {
 185       debug_objects_ht = g_hash_table_new (g_direct_hash, NULL);
 186       g_atexit (debug_objects_atexit);
 187     }
 188 #endif  /* G_ENABLE_DEBUG */
 189 }
 190
 191 static void
 192 g_object_base_class_init (GObjectClass *class)
 193 {
 194   GObjectClass *pclass = g_type_class_peek_parent (class);
 195
 196   /* reset instance specific fields and methods that don't get inherited */
 197   class->construct_properties = pclass ? g_slist_copy (pclass->construct_properties) : NULL;
 198   class->get_property = NULL;
 199   class->set_property = NULL;
 200 }
 201
 202 static void
 203 g_object_base_class_finalize (GObjectClass *class)
 204 {
 205   GList *list, *node;
 206
 207   _g_signals_destroy (G_OBJECT_CLASS_TYPE (class));
 208
 209   g_slist_free (class->construct_properties);
 210   class->construct_properties = NULL;
 211   list = g_param_spec_pool_list_owned (pspec_pool, G_OBJECT_CLASS_TYPE (class));
 212   for (node = list; node; node = node->next)
 213     {
 214       GParamSpec *pspec = node->data;
 215
 216       g_param_spec_pool_remove (pspec_pool, pspec);
 217       PARAM_SPEC_SET_PARAM_ID (pspec, 0);
 218       g_param_spec_unref (pspec);
 219     }
 220   g_list_free (list);
 221 }
 222
 223 static void
 224 g_object_notify_dispatcher (GObject     *object,
 225                             guint        n_pspecs,
 226                             GParamSpec **pspecs)
 227 {
 228   G_OBJECT_GET_CLASS (object)->dispatch_properties_changed (object, n_pspecs, pspecs);
 229 }
 230
 231 static void
 232 g_object_do_class_init (GObjectClass *class)
 233 {
 234   /* read the comment about typedef struct CArray; on why not to change this quark */
 235   quark_closure_array = g_quark_from_static_string ("GObject-closure-array");
 236
 237   quark_weak_refs = g_quark_from_static_string ("GObject-weak-references");
 238   pspec_pool = g_param_spec_pool_new (TRUE);
 239   property_notify_context.quark_notify_queue = g_quark_from_static_string ("GObject-notify-queue");
 240   property_notify_context.dispatcher = g_object_notify_dispatcher;
 241
 242   class->constructor = g_object_constructor;
 243   class->set_property = g_object_do_set_property;
 244   class->get_property = g_object_do_get_property;
 245   class->dispose = g_object_real_dispose;
 246   class->finalize = g_object_finalize;
 247   class->dispatch_properties_changed = g_object_dispatch_properties_changed;
 248   class->notify = NULL;
 249
 250   gobject_signals[NOTIFY] =
 251     g_signal_new ("notify",
 252                   G_TYPE_FROM_CLASS (class),
 253                   G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE | G_SIGNAL_DETAILED | G_SIGNAL_NO_HOOKS,
 254                   G_STRUCT_OFFSET (GObjectClass, notify),
 255                   NULL, NULL,
 256                   g_cclosure_marshal_VOID__PARAM,
 257                   G_TYPE_NONE,
 258                   1, G_TYPE_PARAM);
 259 }
 260
 261 /**
 262  * g_object_class_install_property:
 263  * @class: a #GObjectClass
 264  * @property_id: the id for the new property
 265  * @pspec: the #GParamSpec for the new property
 266  *
 267  * Installs a new property. This is usually done in the class initializer.
 268  **/
 269 void
 270 g_object_class_install_property (GObjectClass *class,
 271                                  guint         property_id,
 272                                  GParamSpec   *pspec)
 273 {
 274   g_return_if_fail (G_IS_OBJECT_CLASS (class));
 275   g_return_if_fail (G_IS_PARAM_SPEC (pspec));
 276   if (pspec->flags & G_PARAM_WRITABLE)
 277     g_return_if_fail (class->set_property != NULL);
 278   if (pspec->flags & G_PARAM_READABLE)
 279     g_return_if_fail (class->get_property != NULL);
 280   g_return_if_fail (property_id > 0);
 281   g_return_if_fail (PARAM_SPEC_PARAM_ID (pspec) == 0);  /* paranoid */
 282   if (pspec->flags & G_PARAM_CONSTRUCT)
 283     g_return_if_fail ((pspec->flags & G_PARAM_CONSTRUCT_ONLY) == 0);
 284   if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
 285     g_return_if_fail (pspec->flags & G_PARAM_WRITABLE);
 286
 287   if (g_param_spec_pool_lookup (pspec_pool, pspec->name, G_OBJECT_CLASS_TYPE (class), FALSE))
 288     {
 289       g_warning (G_STRLOC ": class `%s' already contains a property named `%s'",
 290                  G_OBJECT_CLASS_NAME (class),
 291                  pspec->name);
 292       return;
 293     }
 294
 295   g_param_spec_ref (pspec);
 296   g_param_spec_sink (pspec);
 297   PARAM_SPEC_SET_PARAM_ID (pspec, property_id);
 298   g_param_spec_pool_insert (pspec_pool, pspec, G_OBJECT_CLASS_TYPE (class));
 299   if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
 300     class->construct_properties = g_slist_prepend (class->construct_properties, pspec);
 301
 302   /* for property overrides of construct poperties, we have to get rid
 303    * of the overidden inherited construct property
 304    */
 305   pspec = g_param_spec_pool_lookup (pspec_pool, pspec->name, g_type_parent (G_OBJECT_CLASS_TYPE (class)), TRUE);
 306   if (pspec && pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
 307     class->construct_properties = g_slist_remove (class->construct_properties, pspec);
 308 }
 309
 310 GParamSpec*
 311 g_object_class_find_property (GObjectClass *class,
 312                               const gchar  *property_name)
 313 {
 314   g_return_val_if_fail (G_IS_OBJECT_CLASS (class), NULL);
 315   g_return_val_if_fail (property_name != NULL, NULL);
 316
 317   return g_param_spec_pool_lookup (pspec_pool,
 318                                    property_name,
 319                                    G_OBJECT_CLASS_TYPE (class),
 320                                    TRUE);
 321 }
 322
 323 GParamSpec** /* free result */
 324 g_object_class_list_properties (GObjectClass *class,
 325                                 guint        *n_properties_p)
 326 {
 327   GParamSpec **pspecs;
 328   guint n;
 329
 330   g_return_val_if_fail (G_IS_OBJECT_CLASS (class), NULL);
 331
 332   pspecs = g_param_spec_pool_list (pspec_pool,
 333                                    G_OBJECT_CLASS_TYPE (class),
 334                                    &n);
 335   if (n_properties_p)
 336     *n_properties_p = n;
 337
 338   return pspecs;
 339 }
 340
 341 static void
 342 g_object_init (GObject *object)
 343 {
 344   object->ref_count = 1;
 345   g_datalist_init (&object->qdata);
 346
 347   /* freeze object's notification queue, g_object_newv() preserves pairedness */
 348   g_object_notify_queue_freeze (object, &property_notify_context);
 349
 350 #ifdef  G_ENABLE_DEBUG
 351   IF_DEBUG (OBJECTS)
 352     {
 353       G_LOCK (debug_objects);
 354       debug_objects_count++;
 355       g_hash_table_insert (debug_objects_ht, object, object);
 356       G_UNLOCK (debug_objects);
 357     }
 358 #endif  /* G_ENABLE_DEBUG */
 359 }
 360
 361 static void
 362 g_object_do_set_property (GObject      *object,
 363                           guint         property_id,
 364                           const GValue *value,
 365                           GParamSpec   *pspec)
 366 {
 367   switch (property_id)
 368     {
 369     default:
 370       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
 371       break;
 372     }
 373 }
 374
 375 static void
 376 g_object_do_get_property (GObject     *object,
 377                           guint        property_id,
 378                           GValue      *value,
 379                           GParamSpec  *pspec)
 380 {
 381   switch (property_id)
 382     {
 383     default:
 384       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
 385       break;
 386     }
 387 }
 388
 389 static void
 390 g_object_real_dispose (GObject *object)
 391 {
 392   guint ref_count;
 393
 394   g_signal_handlers_destroy (object);
 395   g_datalist_id_set_data (&object->qdata, quark_closure_array, NULL);
 396
 397   /* yes, temporarily altering the ref_count is hackish, but that
 398    * enforces people not jerking around with weak_ref notifiers
 399    */
 400   ref_count = object->ref_count;
 401   object->ref_count = 0;
 402   g_datalist_id_set_data (&object->qdata, quark_weak_refs, NULL);
 403   object->ref_count = ref_count;
 404 }
 405
 406 static void
 407 g_object_finalize (GObject *object)
 408 {
 409   g_datalist_clear (&object->qdata);
 410
 411 #ifdef  G_ENABLE_DEBUG
 412   IF_DEBUG (OBJECTS)
 413     {
 414       G_LOCK (debug_objects);
 415       g_assert (g_hash_table_lookup (debug_objects_ht, object) == object);
 416       g_hash_table_remove (debug_objects_ht, object);
 417       debug_objects_count--;
 418       G_UNLOCK (debug_objects);
 419     }
 420 #endif  /* G_ENABLE_DEBUG */
 421 }
 422
 423 static void
 424 g_object_last_unref (GObject *object)
 425 {
 426   g_return_if_fail (object->ref_count > 0);
 427
 428   if (object->ref_count == 1)   /* may have been re-referenced meanwhile */
 429     G_OBJECT_GET_CLASS (object)->dispose (object);
 430
 431 #ifdef  G_ENABLE_DEBUG
 432   if (g_trap_object_ref == object)
 433     G_BREAKPOINT ();
 434 #endif  /* G_ENABLE_DEBUG */
 435
 436   object->ref_count -= 1;
 437
 438   if (object->ref_count == 0)   /* may have been re-referenced meanwhile */
 439     {
 440       g_signal_handlers_destroy (object);
 441       g_datalist_id_set_data (&object->qdata, quark_weak_refs, NULL);
 442       G_OBJECT_GET_CLASS (object)->finalize (object);
 443 #ifdef  G_ENABLE_DEBUG
 444       IF_DEBUG (OBJECTS)
 445         {
 446           /* catch objects not chaining finalize handlers */
 447           G_LOCK (debug_objects);
 448           g_assert (g_hash_table_lookup (debug_objects_ht, object) == NULL);
 449           G_UNLOCK (debug_objects);
 450         }
 451 #endif  /* G_ENABLE_DEBUG */
 452       g_type_free_instance ((GTypeInstance*) object);
 453     }
 454 }
 455
 456 static void
 457 g_object_dispatch_properties_changed (GObject     *object,
 458                                       guint        n_pspecs,
 459                                       GParamSpec **pspecs)
 460 {
 461   guint i;
 462
 463   for (i = 0; i < n_pspecs; i++)
 464     g_signal_emit (object, gobject_signals[NOTIFY], g_quark_from_string (pspecs[i]->name), pspecs[i]);
 465 }
 466
 467 void
 468 g_object_run_dispose (GObject *object)
 469 {
 470   g_return_if_fail (G_IS_OBJECT (object));
 471   g_return_if_fail (object->ref_count > 0);
 472
 473   g_object_ref (object);
 474   G_OBJECT_GET_CLASS (object)->dispose (object);
 475   g_object_unref (object);
 476 }
 477
 478 void
 479 g_object_freeze_notify (GObject *object)
 480 {
 481   g_return_if_fail (G_IS_OBJECT (object));
 482   if (!object->ref_count)
 483     return;
 484
 485   g_object_ref (object);
 486   g_object_notify_queue_freeze (object, &property_notify_context);
 487   g_object_unref (object);
 488 }
 489
 490 void
 491 g_object_notify (GObject     *object,
 492                  const gchar *property_name)
 493 {
 494   GParamSpec *pspec;
 495
 496   g_return_if_fail (G_IS_OBJECT (object));
 497   g_return_if_fail (property_name != NULL);
 498   if (!object->ref_count)
 499     return;
 500
 501   g_object_ref (object);
 502   pspec = g_param_spec_pool_lookup (pspec_pool,
 503                                     property_name,
 504                                     G_OBJECT_TYPE (object),
 505                                     TRUE);
 506   if (!pspec)
 507     g_warning ("%s: object class `%s' has no property named `%s'",
 508                G_STRLOC,
 509                G_OBJECT_TYPE_NAME (object),
 510                property_name);
 511   else
 512     {
 513       GObjectNotifyQueue *nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
 514
 515       g_object_notify_queue_add (object, nqueue, pspec);
 516       g_object_notify_queue_thaw (object, nqueue);
 517     }
 518   g_object_unref (object);
 519 }
 520
 521 void
 522 g_object_thaw_notify (GObject *object)
 523 {
 524   GObjectNotifyQueue *nqueue;
 525
 526   g_return_if_fail (G_IS_OBJECT (object));
 527   if (!object->ref_count)
 528     return;
 529
 530   g_object_ref (object);
 531   nqueue = g_object_notify_queue_from_object (object, &property_notify_context);
 532   if (!nqueue || !nqueue->freeze_count)
 533     g_warning (G_STRLOC ": property-changed notification for %s(%p) is not frozen",
 534                G_OBJECT_TYPE_NAME (object), object);
 535   else
 536     g_object_notify_queue_thaw (object, nqueue);
 537   g_object_unref (object);
 538 }
 539
 540 static inline void
 541 object_get_property (GObject     *object,
 542                      GParamSpec  *pspec,
 543                      GValue      *value)
 544 {
 545   GObjectClass *class = g_type_class_peek (pspec->owner_type);
 546
 547   class->get_property (object, PARAM_SPEC_PARAM_ID (pspec), value, pspec);
 548 }
 549
 550 static inline void
 551 object_set_property (GObject             *object,
 552                      GParamSpec          *pspec,
 553                      const GValue        *value,
 554                      GObjectNotifyQueue  *nqueue)
 555 {
 556   GValue tmp_value = { 0, };
 557   GObjectClass *class = g_type_class_peek (pspec->owner_type);
 558
 559   /* provide a copy to work from, convert (if necessary) and validate */
 560   g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 561   if (!g_value_transform (value, &tmp_value))
 562     g_warning ("unable to set property `%s' of type `%s' from value of type `%s'",
 563                pspec->name,
 564                g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
 565                G_VALUE_TYPE_NAME (value));
 566   else if (g_param_value_validate (pspec, &tmp_value) && !(pspec->flags & G_PARAM_LAX_VALIDATION))
 567     {
 568       gchar *contents = g_strdup_value_contents (value);
 569
 570       g_warning ("value \"%s\" of type `%s' is invalid for property `%s' of type `%s'",
 571                  contents,
 572                  G_VALUE_TYPE_NAME (value),
 573                  pspec->name,
 574                  g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)));
 575       g_free (contents);
 576     }
 577   else
 578     {
 579       class->set_property (object, PARAM_SPEC_PARAM_ID (pspec), &tmp_value, pspec);
 580       g_object_notify_queue_add (object, nqueue, pspec);
 581     }
 582   g_value_unset (&tmp_value);
 583 }
 584
 585 gpointer
 586 g_object_new (GType        object_type,
 587               const gchar *first_property_name,
 588               ...)
 589 {
 590   GObject *object;
 591   va_list var_args;
 592
 593   g_return_val_if_fail (G_TYPE_IS_OBJECT (object_type), NULL);
 594
 595   va_start (var_args, first_property_name);
 596   object = g_object_new_valist (object_type, first_property_name, var_args);
 597   va_end (var_args);
 598
 599   return object;
 600 }
 601
 602 gpointer
 603 g_object_newv (GType       object_type,
 604                guint       n_parameters,
 605                GParameter *parameters)
 606 {
 607   GObjectConstructParam *cparams, *oparams;
 608   GObjectNotifyQueue *nqueue;
 609   GObject *object;
 610   GObjectClass *class;
 611   GSList *slist;
 612   guint n_total_cparams = 0, n_cparams = 0, n_oparams = 0, n_cvalues;
 613   GValue *cvalues;
 614   GList *clist = NULL;
 615   guint i;
 616
 617   g_return_val_if_fail (G_TYPE_IS_OBJECT (object_type), NULL);
 618
 619   class = g_type_class_ref (object_type);
 620   for (slist = class->construct_properties; slist; slist = slist->next)
 621     {
 622       clist = g_list_prepend (clist, slist->data);
 623       n_total_cparams += 1;
 624     }
 625
 626   /* collect parameters, sort into construction and normal ones */
 627   oparams = g_new (GObjectConstructParam, n_parameters);
 628   cparams = g_new (GObjectConstructParam, n_total_cparams);
 629   for (i = 0; i < n_parameters; i++)
 630     {
 631       GValue *value = &parameters[i].value;
 632       GParamSpec *pspec = g_param_spec_pool_lookup (pspec_pool,
 633                                                     parameters[i].name,
 634                                                     object_type,
 635                                                     TRUE);
 636       if (!pspec)
 637         {
 638           g_warning ("%s: object class `%s' has no property named `%s'",
 639                      G_STRLOC,
 640                      g_type_name (object_type),
 641                      parameters[i].name);
 642           continue;
 643         }
 644       if (!(pspec->flags & G_PARAM_WRITABLE))
 645         {
 646           g_warning ("%s: property `%s' of object class `%s' is not writable",
 647                      G_STRLOC,
 648                      pspec->name,
 649                      g_type_name (object_type));
 650           continue;
 651         }
 652       if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
 653         {
 654           GList *list = g_list_find (clist, pspec);
 655
 656           if (!list)
 657             {
 658               g_warning (G_STRLOC ": construct property \"%s\" for object `%s' can't be set twice",
 659                          pspec->name, g_type_name (object_type));
 660               continue;
 661             }
 662           cparams[n_cparams].pspec = pspec;
 663           cparams[n_cparams].value = value;
 664           n_cparams++;
 665           if (!list->prev)
 666             clist = list->next;
 667           else
 668             list->prev->next = list->next;
 669           if (list->next)
 670             list->next->prev = list->prev;
 671           g_list_free_1 (list);
 672         }
 673       else
 674         {
 675           oparams[n_oparams].pspec = pspec;
 676           oparams[n_oparams].value = value;
 677           n_oparams++;
 678         }
 679     }
 680
 681   /* set remaining construction properties to default values */
 682   n_cvalues = n_total_cparams - n_cparams;
 683   cvalues = g_new (GValue, n_cvalues);
 684   while (clist)
 685     {
 686       GList *tmp = clist->next;
 687       GParamSpec *pspec = clist->data;
 688       GValue *value = cvalues + n_total_cparams - n_cparams - 1;
 689
 690       value->g_type = 0;
 691       g_value_init (value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 692       g_param_value_set_default (pspec, value);
 693
 694       cparams[n_cparams].pspec = pspec;
 695       cparams[n_cparams].value = value;
 696       n_cparams++;
 697
 698       g_list_free_1 (clist);
 699       clist = tmp;
 700     }
 701
 702   /* construct object from construction parameters */
 703   object = class->constructor (object_type, n_total_cparams, cparams);
 704
 705   /* free construction values */
 706   g_free (cparams);
 707   while (n_cvalues--)
 708     g_value_unset (cvalues + n_cvalues);
 709   g_free (cvalues);
 710
 711   /* release g_object_init() notification queue freeze_count */
 712   nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
 713   g_object_notify_queue_thaw (object, nqueue);
 714
 715   /* set remaining properties */
 716   for (i = 0; i < n_oparams; i++)
 717     object_set_property (object, oparams[i].pspec, oparams[i].value, nqueue);
 718   g_free (oparams);
 719
 720   g_type_class_unref (class);
 721
 722   /* release our own freeze count and handle notifications */
 723   g_object_notify_queue_thaw (object, nqueue);
 724
 725   return object;
 726 }
 727
 728 GObject*
 729 g_object_new_valist (GType        object_type,
 730                      const gchar *first_property_name,
 731                      va_list      var_args)
 732 {
 733   GObjectClass *class;
 734   GParameter *params;
 735   const gchar *name;
 736   GObject *object;
 737   guint n_params = 0, n_alloced_params = 16;
 738
 739   g_return_val_if_fail (G_TYPE_IS_OBJECT (object_type), NULL);
 740
 741   if (!first_property_name)
 742     return g_object_newv (object_type, 0, NULL);
 743
 744   class = g_type_class_ref (object_type);
 745
 746   params = g_new (GParameter, n_alloced_params);
 747   name = first_property_name;
 748   while (name)
 749     {
 750       gchar *error = NULL;
 751       GParamSpec *pspec = g_param_spec_pool_lookup (pspec_pool,
 752                                                     name,
 753                                                     object_type,
 754                                                     TRUE);
 755       if (!pspec)
 756         {
 757           g_warning ("%s: object class `%s' has no property named `%s'",
 758                      G_STRLOC,
 759                      g_type_name (object_type),
 760                      name);
 761           break;
 762         }
 763       if (n_params >= n_alloced_params)
 764         {
 765           n_alloced_params += 16;
 766           params = g_renew (GParameter, params, n_alloced_params);
 767         }
 768       params[n_params].name = name;
 769       params[n_params].value.g_type = 0;
 770       g_value_init (&params[n_params].value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 771       G_VALUE_COLLECT (&params[n_params].value, var_args, 0, &error);
 772       if (error)
 773         {
 774           g_warning ("%s: %s", G_STRLOC, error);
 775           g_free (error);
 776
 777           /* we purposely leak the value here, it might not be
 778            * in a sane state if an error condition occoured
 779            */
 780           break;
 781         }
 782       n_params++;
 783       name = va_arg (var_args, gchar*);
 784     }
 785
 786   object = g_object_newv (object_type, n_params, params);
 787
 788   while (n_params--)
 789     g_value_unset (&params[n_params].value);
 790   g_free (params);
 791
 792   g_type_class_unref (class);
 793
 794   return object;
 795 }
 796
 797 static GObject*
 798 g_object_constructor (GType                  type,
 799                       guint                  n_construct_properties,
 800                       GObjectConstructParam *construct_params)
 801 {
 802   GObject *object;
 803
 804   /* create object */
 805   object = (GObject*) g_type_create_instance (type);
 806
 807   /* set construction parameters */
 808   if (n_construct_properties)
 809     {
 810       GObjectNotifyQueue *nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
 811
 812       /* set construct properties */
 813       while (n_construct_properties--)
 814         {
 815           GValue *value = construct_params->value;
 816           GParamSpec *pspec = construct_params->pspec;
 817
 818           construct_params++;
 819           object_set_property (object, pspec, value, nqueue);
 820         }
 821       g_object_notify_queue_thaw (object, nqueue);
 822       /* the notification queue is still frozen from g_object_init(), so
 823        * we don't need to handle it here, g_object_newv() takes
 824        * care of that
 825        */
 826     }
 827
 828   return object;
 829 }
 830
 831 void
 832 g_object_set_valist (GObject     *object,
 833                      const gchar *first_property_name,
 834                      va_list      var_args)
 835 {
 836   GObjectNotifyQueue *nqueue;
 837   const gchar *name;
 838
 839   g_return_if_fail (G_IS_OBJECT (object));
 840
 841   g_object_ref (object);
 842   nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
 843
 844   name = first_property_name;
 845   while (name)
 846     {
 847       GValue value = { 0, };
 848       GParamSpec *pspec;
 849       gchar *error = NULL;
 850
 851       pspec = g_param_spec_pool_lookup (pspec_pool,
 852                                         name,
 853                                         G_OBJECT_TYPE (object),
 854                                         TRUE);
 855       if (!pspec)
 856         {
 857           g_warning ("%s: object class `%s' has no property named `%s'",
 858                      G_STRLOC,
 859                      G_OBJECT_TYPE_NAME (object),
 860                      name);
 861           break;
 862         }
 863       if (!(pspec->flags & G_PARAM_WRITABLE))
 864         {
 865           g_warning ("%s: property `%s' of object class `%s' is not writable",
 866                      G_STRLOC,
 867                      pspec->name,
 868                      G_OBJECT_TYPE_NAME (object));
 869           break;
 870         }
 871
 872       g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 873
 874       G_VALUE_COLLECT (&value, var_args, 0, &error);
 875       if (error)
 876         {
 877           g_warning ("%s: %s", G_STRLOC, error);
 878           g_free (error);
 879
 880           /* we purposely leak the value here, it might not be
 881            * in a sane state if an error condition occoured
 882            */
 883           break;
 884         }
 885
 886       object_set_property (object, pspec, &value, nqueue);
 887       g_value_unset (&value);
 888
 889       name = va_arg (var_args, gchar*);
 890     }
 891
 892   g_object_notify_queue_thaw (object, nqueue);
 893   g_object_unref (object);
 894 }
 895
 896 void
 897 g_object_get_valist (GObject     *object,
 898                      const gchar *first_property_name,
 899                      va_list      var_args)
 900 {
 901   const gchar *name;
 902
 903   g_return_if_fail (G_IS_OBJECT (object));
 904
 905   g_object_ref (object);
 906
 907   name = first_property_name;
 908
 909   while (name)
 910     {
 911       GValue value = { 0, };
 912       GParamSpec *pspec;
 913       gchar *error;
 914
 915       pspec = g_param_spec_pool_lookup (pspec_pool,
 916                                         name,
 917                                         G_OBJECT_TYPE (object),
 918                                         TRUE);
 919       if (!pspec)
 920         {
 921           g_warning ("%s: object class `%s' has no property named `%s'",
 922                      G_STRLOC,
 923                      G_OBJECT_TYPE_NAME (object),
 924                      name);
 925           break;
 926         }
 927       if (!(pspec->flags & G_PARAM_READABLE))
 928         {
 929           g_warning ("%s: property `%s' of object class `%s' is not readable",
 930                      G_STRLOC,
 931                      pspec->name,
 932                      G_OBJECT_TYPE_NAME (object));
 933           break;
 934         }
 935
 936       g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 937
 938       object_get_property (object, pspec, &value);
 939
 940       G_VALUE_LCOPY (&value, var_args, 0, &error);
 941       if (error)
 942         {
 943           g_warning ("%s: %s", G_STRLOC, error);
 944           g_free (error);
 945           g_value_unset (&value);
 946           break;
 947         }
 948
 949       g_value_unset (&value);
 950
 951       name = va_arg (var_args, gchar*);
 952     }
 953
 954   g_object_unref (object);
 955 }
 956
 957 void
 958 g_object_set (gpointer     _object,
 959               const gchar *first_property_name,
 960               ...)
 961 {
 962   GObject *object = _object;
 963   va_list var_args;
 964
 965   g_return_if_fail (G_IS_OBJECT (object));
 966
 967   va_start (var_args, first_property_name);
 968   g_object_set_valist (object, first_property_name, var_args);
 969   va_end (var_args);
 970 }
 971
 972 void
 973 g_object_get (gpointer     _object,
 974               const gchar *first_property_name,
 975               ...)
 976 {
 977   GObject *object = _object;
 978   va_list var_args;
 979
 980   g_return_if_fail (G_IS_OBJECT (object));
 981
 982   va_start (var_args, first_property_name);
 983   g_object_get_valist (object, first_property_name, var_args);
 984   va_end (var_args);
 985 }
 986
 987 void
 988 g_object_set_property (GObject      *object,
 989                        const gchar  *property_name,
 990                        const GValue *value)
 991 {
 992   GObjectNotifyQueue *nqueue;
 993   GParamSpec *pspec;
 994
 995   g_return_if_fail (G_IS_OBJECT (object));
 996   g_return_if_fail (property_name != NULL);
 997   g_return_if_fail (G_IS_VALUE (value));
 998
 999   g_object_ref (object);
1000   nqueue = g_object_notify_queue_freeze (object, &property_notify_context);
1001
1002   pspec = g_param_spec_pool_lookup (pspec_pool,
1003                                     property_name,
1004                                     G_OBJECT_TYPE (object),
1005                                     TRUE);
1006   if (!pspec)
1007     g_warning ("%s: object class `%s' has no property named `%s'",
1008                G_STRLOC,
1009                G_OBJECT_TYPE_NAME (object),
1010                property_name);
1011   else
1012     object_set_property (object, pspec, value, nqueue);
1013
1014   g_object_notify_queue_thaw (object, nqueue);
1015   g_object_unref (object);
1016 }
1017
1018 void
1019 g_object_get_property (GObject     *object,
1020                        const gchar *property_name,
1021                        GValue      *value)
1022 {
1023   GParamSpec *pspec;
1024
1025   g_return_if_fail (G_IS_OBJECT (object));
1026   g_return_if_fail (property_name != NULL);
1027   g_return_if_fail (G_IS_VALUE (value));
1028
1029   g_object_ref (object);
1030
1031   pspec = g_param_spec_pool_lookup (pspec_pool,
1032                                     property_name,
1033                                     G_OBJECT_TYPE (object),
1034                                     TRUE);
1035   if (!pspec)
1036     g_warning ("%s: object class `%s' has no property named `%s'",
1037                G_STRLOC,
1038                G_OBJECT_TYPE_NAME (object),
1039                property_name);
1040   else
1041     {
1042       GValue *prop_value, tmp_value = { 0, };
1043
1044       /* auto-conversion of the callers value type
1045        */
1046       if (G_VALUE_TYPE (value) == G_PARAM_SPEC_VALUE_TYPE (pspec))
1047         {
1048           g_value_reset (value);
1049           prop_value = value;
1050         }
1051       else if (!g_value_type_transformable (G_PARAM_SPEC_VALUE_TYPE (pspec), G_VALUE_TYPE (value)))
1052         {
1053           g_warning ("can't retrieve property `%s' of type `%s' as value of type `%s'",
1054                      pspec->name,
1055                      g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
1056                      G_VALUE_TYPE_NAME (value));
1057           g_object_unref (object);
1058           return;
1059         }
1060       else
1061         {
1062           g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
1063           prop_value = &tmp_value;
1064         }
1065       object_get_property (object, pspec, prop_value);
1066       if (prop_value != value)
1067         {
1068           g_value_transform (prop_value, value);
1069           g_value_unset (&tmp_value);
1070         }
1071     }
1072
1073   g_object_unref (object);
1074 }
1075
1076 gpointer
1077 g_object_connect (gpointer     _object,
1078                   const gchar *signal_spec,
1079                   ...)
1080 {
1081   GObject *object = _object;
1082   va_list var_args;
1083
1084   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1085   g_return_val_if_fail (object->ref_count > 0, object);
1086
1087   va_start (var_args, signal_spec);
1088   while (signal_spec)
1089     {
1090       GCallback callback = va_arg (var_args, GCallback);
1091       gpointer data = va_arg (var_args, gpointer);
1092       gulong sid;
1093
1094       if (strncmp (signal_spec, "signal::", 8) == 0)
1095         sid = g_signal_connect_data (object, signal_spec + 8,
1096                                      callback, data, NULL,
1097                                      0);
1098       else if (strncmp (signal_spec, "object_signal::", 15) == 0)
1099         sid = g_signal_connect_object (object, signal_spec + 15,
1100                                        callback, data,
1101                                        0);
1102       else if (strncmp (signal_spec, "swapped_signal::", 16) == 0)
1103         sid = g_signal_connect_data (object, signal_spec + 16,
1104                                      callback, data, NULL,
1105                                      G_CONNECT_SWAPPED);
1106       else if (strncmp (signal_spec, "swapped_object_signal::", 23) == 0)
1107         sid = g_signal_connect_object (object, signal_spec + 23,
1108                                        callback, data,
1109                                        G_CONNECT_SWAPPED);
1110       else if (strncmp (signal_spec, "signal_after::", 14) == 0)
1111         sid = g_signal_connect_data (object, signal_spec + 14,
1112                                      callback, data, NULL,
1113                                      G_CONNECT_AFTER);
1114       else if (strncmp (signal_spec, "object_signal_after::", 21) == 0)
1115         sid = g_signal_connect_object (object, signal_spec + 21,
1116                                        callback, data,
1117                                        G_CONNECT_AFTER);
1118       else if (strncmp (signal_spec, "swapped_signal_after::", 22) == 0)
1119         sid = g_signal_connect_data (object, signal_spec + 22,
1120                                      callback, data, NULL,
1121                                      G_CONNECT_SWAPPED | G_CONNECT_AFTER);
1122       else if (strncmp (signal_spec, "swapped_object_signal_after::", 29) == 0)
1123         sid = g_signal_connect_object (object, signal_spec + 29,
1124                                        callback, data,
1125                                        G_CONNECT_SWAPPED | G_CONNECT_AFTER);
1126       else
1127         {
1128           g_warning ("%s: invalid signal spec \"%s\"", G_STRLOC, signal_spec);
1129           break;
1130         }
1131       signal_spec = va_arg (var_args, gchar*);
1132     }
1133   va_end (var_args);
1134
1135   return object;
1136 }
1137
1138 void
1139 g_object_disconnect (gpointer     _object,
1140                      const gchar *signal_spec,
1141                      ...)
1142 {
1143   GObject *object = _object;
1144   va_list var_args;
1145
1146   g_return_if_fail (G_IS_OBJECT (object));
1147   g_return_if_fail (object->ref_count > 0);
1148
1149   va_start (var_args, signal_spec);
1150   while (signal_spec)
1151     {
1152       GCallback callback = va_arg (var_args, GCallback);
1153       gpointer data = va_arg (var_args, gpointer);
1154       guint sid = 0, detail = 0, mask = 0;
1155
1156       if (strncmp (signal_spec, "any_signal::", 12) == 0)
1157         {
1158           signal_spec += 12;
1159           mask = G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA;
1160         }
1161       else if (strcmp (signal_spec, "any_signal") == 0)
1162         {
1163           signal_spec += 10;
1164           mask = G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA;
1165         }
1166       else
1167         {
1168           g_warning ("%s: invalid signal spec \"%s\"", G_STRLOC, signal_spec);
1169           break;
1170         }
1171
1172       if ((mask & G_SIGNAL_MATCH_ID) &&
1173           !g_signal_parse_name (signal_spec, G_OBJECT_TYPE (object), &sid, &detail, FALSE))
1174         g_warning ("%s: invalid signal name \"%s\"", G_STRLOC, signal_spec);
1175       else if (!g_signal_handlers_disconnect_matched (object, mask | (detail ? G_SIGNAL_MATCH_DETAIL : 0),
1176                                                       sid, detail,
1177                                                       NULL, (gpointer)callback, data))
1178         g_warning (G_STRLOC ": signal handler %p(%p) is not connected", callback, data);
1179       signal_spec = va_arg (var_args, gchar*);
1180     }
1181   va_end (var_args);
1182 }
1183
1184 typedef struct {
1185   GObject *object;
1186   guint n_weak_refs;
1187   struct {
1188     GWeakNotify notify;
1189     gpointer    data;
1190   } weak_refs[1];  /* flexible array */
1191 } WeakRefStack;
1192
1193 static void
1194 weak_refs_notify (gpointer data)
1195 {
1196   WeakRefStack *wstack = data;
1197   guint i;
1198
1199   for (i = 0; i < wstack->n_weak_refs; i++)
1200     wstack->weak_refs[i].notify (wstack->weak_refs[i].data, wstack->object);
1201   g_free (wstack);
1202 }
1203
1204 void
1205 g_object_weak_ref (GObject    *object,
1206                    GWeakNotify notify,
1207                    gpointer    data)
1208 {
1209   WeakRefStack *wstack;
1210   guint i;
1211
1212   g_return_if_fail (G_IS_OBJECT (object));
1213   g_return_if_fail (notify != NULL);
1214   g_return_if_fail (object->ref_count >= 1);
1215
1216   wstack = g_datalist_id_remove_no_notify (&object->qdata, quark_weak_refs);
1217   if (wstack)
1218     {
1219       i = wstack->n_weak_refs++;
1220       wstack = g_realloc (wstack, sizeof (*wstack) + sizeof (wstack->weak_refs[0]) * i);
1221     }
1222   else
1223     {
1224       wstack = g_renew (WeakRefStack, NULL, 1);
1225       wstack->object = object;
1226       wstack->n_weak_refs = 1;
1227       i = 0;
1228     }
1229   wstack->weak_refs[i].notify = notify;
1230   wstack->weak_refs[i].data = data;
1231   g_datalist_id_set_data_full (&object->qdata, quark_weak_refs, wstack, weak_refs_notify);
1232 }
1233
1234 void
1235 g_object_weak_unref (GObject    *object,
1236                      GWeakNotify notify,
1237                      gpointer    data)
1238 {
1239   WeakRefStack *wstack;
1240   gboolean found_one = FALSE;
1241
1242   g_return_if_fail (G_IS_OBJECT (object));
1243   g_return_if_fail (notify != NULL);
1244
1245   wstack = g_datalist_id_get_data (&object->qdata, quark_weak_refs);
1246   if (wstack)
1247     {
1248       guint i;
1249
1250       for (i = 0; i < wstack->n_weak_refs; i++)
1251         if (wstack->weak_refs[i].notify == notify &&
1252             wstack->weak_refs[i].data == data)
1253           {
1254             found_one = TRUE;
1255             wstack->n_weak_refs -= 1;
1256             if (i != wstack->n_weak_refs)
1257               {
1258                 wstack->weak_refs[i].notify = wstack->weak_refs[wstack->n_weak_refs].notify;
1259                 wstack->weak_refs[i].data = wstack->weak_refs[wstack->n_weak_refs].data;
1260               }
1261             break;
1262           }
1263     }
1264   if (!found_one)
1265     g_warning (G_STRLOC ": couldn't find weak ref %p(%p)", notify, data);
1266 }
1267
1268 void
1269 g_object_add_weak_pointer (GObject  *object,
1270                            gpointer *weak_pointer_location)
1271 {
1272   g_return_if_fail (G_IS_OBJECT (object));
1273   g_return_if_fail (weak_pointer_location != NULL);
1274
1275   g_object_weak_ref (object,
1276                      (GWeakNotify) g_nullify_pointer,
1277                      weak_pointer_location);
1278 }
1279
1280 void
1281 g_object_remove_weak_pointer (GObject  *object,
1282                               gpointer *weak_pointer_location)
1283 {
1284   g_return_if_fail (G_IS_OBJECT (object));
1285   g_return_if_fail (weak_pointer_location != NULL);
1286
1287   g_object_weak_unref (object,
1288                        (GWeakNotify) g_nullify_pointer,
1289                        weak_pointer_location);
1290 }
1291
1292 gpointer
1293 g_object_ref (gpointer _object)
1294 {
1295   GObject *object = _object;
1296
1297   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1298   g_return_val_if_fail (object->ref_count > 0, NULL);
1299
1300 #ifdef  G_ENABLE_DEBUG
1301   if (g_trap_object_ref == object)
1302     G_BREAKPOINT ();
1303 #endif  /* G_ENABLE_DEBUG */
1304
1305   object->ref_count += 1;
1306
1307   return object;
1308 }
1309
1310 void
1311 g_object_unref (gpointer _object)
1312 {
1313   GObject *object = _object;
1314
1315   g_return_if_fail (G_IS_OBJECT (object));
1316   g_return_if_fail (object->ref_count > 0);
1317
1318 #ifdef  G_ENABLE_DEBUG
1319   if (g_trap_object_ref == object)
1320     G_BREAKPOINT ();
1321 #endif  /* G_ENABLE_DEBUG */
1322
1323   if (object->ref_count > 1)
1324     object->ref_count -= 1;
1325   else
1326     g_object_last_unref (object);
1327 }
1328
1329 gpointer
1330 g_object_get_qdata (GObject *object,
1331                     GQuark   quark)
1332 {
1333   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1334
1335   return quark ? g_datalist_id_get_data (&object->qdata, quark) : NULL;
1336 }
1337
1338 void
1339 g_object_set_qdata (GObject *object,
1340                     GQuark   quark,
1341                     gpointer data)
1342 {
1343   g_return_if_fail (G_IS_OBJECT (object));
1344   g_return_if_fail (quark > 0);
1345
1346   g_datalist_id_set_data (&object->qdata, quark, data);
1347 }
1348
1349 void
1350 g_object_set_qdata_full (GObject       *object,
1351                          GQuark         quark,
1352                          gpointer       data,
1353                          GDestroyNotify destroy)
1354 {
1355   g_return_if_fail (G_IS_OBJECT (object));
1356   g_return_if_fail (quark > 0);
1357
1358   g_datalist_id_set_data_full (&object->qdata, quark, data,
1359                                data ? destroy : (GDestroyNotify) NULL);
1360 }
1361
1362 gpointer
1363 g_object_steal_qdata (GObject *object,
1364                       GQuark   quark)
1365 {
1366   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1367   g_return_val_if_fail (quark > 0, NULL);
1368
1369   return g_datalist_id_remove_no_notify (&object->qdata, quark);
1370 }
1371
1372 gpointer
1373 g_object_get_data (GObject     *object,
1374                    const gchar *key)
1375 {
1376   GQuark quark;
1377
1378   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1379   g_return_val_if_fail (key != NULL, NULL);
1380
1381   quark = g_quark_try_string (key);
1382
1383   return quark ? g_datalist_id_get_data (&object->qdata, quark) : NULL;
1384 }
1385
1386 void
1387 g_object_set_data (GObject     *object,
1388                    const gchar *key,
1389                    gpointer     data)
1390 {
1391   g_return_if_fail (G_IS_OBJECT (object));
1392   g_return_if_fail (key != NULL);
1393
1394   g_datalist_id_set_data (&object->qdata, g_quark_from_string (key), data);
1395 }
1396
1397 void
1398 g_object_set_data_full (GObject       *object,
1399                         const gchar   *key,
1400                         gpointer       data,
1401                         GDestroyNotify destroy)
1402 {
1403   g_return_if_fail (G_IS_OBJECT (object));
1404   g_return_if_fail (key != NULL);
1405
1406   g_datalist_id_set_data_full (&object->qdata, g_quark_from_string (key), data,
1407                                data ? destroy : (GDestroyNotify) NULL);
1408 }
1409
1410 gpointer
1411 g_object_steal_data (GObject     *object,
1412                      const gchar *key)
1413 {
1414   GQuark quark;
1415
1416   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1417   g_return_val_if_fail (key != NULL, NULL);
1418
1419   quark = g_quark_try_string (key);
1420
1421   return quark ? g_datalist_id_remove_no_notify (&object->qdata, quark) : NULL;
1422 }
1423
1424 static void
1425 g_value_object_init (GValue *value)
1426 {
1427   value->data[0].v_pointer = NULL;
1428 }
1429
1430 static void
1431 g_value_object_free_value (GValue *value)
1432 {
1433   if (value->data[0].v_pointer)
1434     g_object_unref (value->data[0].v_pointer);
1435 }
1436
1437 static void
1438 g_value_object_copy_value (const GValue *src_value,
1439                            GValue       *dest_value)
1440 {
1441   if (src_value->data[0].v_pointer)
1442     dest_value->data[0].v_pointer = g_object_ref (src_value->data[0].v_pointer);
1443   else
1444     dest_value->data[0].v_pointer = NULL;
1445 }
1446
1447 static void
1448 g_value_object_transform_value (const GValue *src_value,
1449                                 GValue       *dest_value)
1450 {
1451   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)))
1452     dest_value->data[0].v_pointer = g_object_ref (src_value->data[0].v_pointer);
1453   else
1454     dest_value->data[0].v_pointer = NULL;
1455 }
1456
1457 static gpointer
1458 g_value_object_peek_pointer (const GValue *value)
1459 {
1460   return value->data[0].v_pointer;
1461 }
1462
1463 static gchar*
1464 g_value_object_collect_value (GValue      *value,
1465                               guint        n_collect_values,
1466                               GTypeCValue *collect_values,
1467                               guint        collect_flags)
1468 {
1469   if (collect_values[0].v_pointer)
1470     {
1471       GObject *object = collect_values[0].v_pointer;
1472
1473       if (object->g_type_instance.g_class == NULL)
1474         return g_strconcat ("invalid unclassed object pointer for value type `",
1475                             G_VALUE_TYPE_NAME (value),
1476                             "'",
1477                             NULL);
1478       else if (!g_value_type_compatible (G_OBJECT_TYPE (object), G_VALUE_TYPE (value)))
1479         return g_strconcat ("invalid object type `",
1480                             G_OBJECT_TYPE_NAME (object),
1481                             "' for value type `",
1482                             G_VALUE_TYPE_NAME (value),
1483                             "'",
1484                             NULL);
1485       /* never honour G_VALUE_NOCOPY_CONTENTS for ref-counted types */
1486       value->data[0].v_pointer = g_object_ref (object);
1487     }
1488   else
1489     value->data[0].v_pointer = NULL;
1490
1491   return NULL;
1492 }
1493
1494 static gchar*
1495 g_value_object_lcopy_value (const GValue *value,
1496                             guint        n_collect_values,
1497                             GTypeCValue *collect_values,
1498                             guint        collect_flags)
1499 {
1500   GObject **object_p = collect_values[0].v_pointer;
1501
1502   if (!object_p)
1503     return g_strdup_printf ("value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value));
1504
1505   if (!value->data[0].v_pointer)
1506     *object_p = NULL;
1507   else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
1508     *object_p = value->data[0].v_pointer;
1509   else
1510     *object_p = g_object_ref (value->data[0].v_pointer);
1511
1512   return NULL;
1513 }
1514
1515 void
1516 g_value_set_object (GValue   *value,
1517                     gpointer  v_object)
1518 {
1519   g_return_if_fail (G_VALUE_HOLDS_OBJECT (value));
1520
1521   if (value->data[0].v_pointer)
1522     {
1523       g_object_unref (value->data[0].v_pointer);
1524       value->data[0].v_pointer = NULL;
1525     }
1526
1527   if (v_object)
1528     {
1529       g_return_if_fail (G_IS_OBJECT (v_object));
1530       g_return_if_fail (g_value_type_compatible (G_OBJECT_TYPE (v_object), G_VALUE_TYPE (value)));
1531
1532       value->data[0].v_pointer = v_object;
1533       g_object_ref (value->data[0].v_pointer);
1534     }
1535 }
1536
1537 void
1538 g_value_set_object_take_ownership (GValue  *value,
1539                                    gpointer v_object)
1540 {
1541   g_return_if_fail (G_VALUE_HOLDS_OBJECT (value));
1542
1543   if (value->data[0].v_pointer)
1544     {
1545       g_object_unref (value->data[0].v_pointer);
1546       value->data[0].v_pointer = NULL;
1547     }
1548
1549   if (v_object)
1550     {
1551       g_return_if_fail (G_IS_OBJECT (v_object));
1552       g_return_if_fail (g_value_type_compatible (G_OBJECT_TYPE (v_object), G_VALUE_TYPE (value)));
1553
1554       value->data[0].v_pointer = v_object; /* we take over the reference count */
1555     }
1556 }
1557
1558 gpointer
1559 g_value_get_object (const GValue *value)
1560 {
1561   g_return_val_if_fail (G_VALUE_HOLDS_OBJECT (value), NULL);
1562
1563   return value->data[0].v_pointer;
1564 }
1565
1566 GObject*
1567 g_value_dup_object (const GValue *value)
1568 {
1569   g_return_val_if_fail (G_VALUE_HOLDS_OBJECT (value), NULL);
1570
1571   return value->data[0].v_pointer ? g_object_ref (value->data[0].v_pointer) : NULL;
1572 }
1573
1574 /**
1575  * g_signal_connect_object:
1576  * @instance: the instance to connect to.
1577  * @detailed_signal: a string of the form "signal-name::detail".
1578  * @c_handler: the #GCallback to connect.
1579  * @gobject: the object to pass as data to @c_handler.
1580  * @connect_flags: a combination of #GConnnectFlags.
1581  *
1582  * This is similar to g_signal_connect_data(), but uses a closure which
1583  * ensures that the object stays alive during the call to @c_handler.
1584  *
1585  * Return value: the handler id.
1586  **/
1587 gulong
1588 g_signal_connect_object (gpointer      instance,
1589                          const gchar  *detailed_signal,
1590                          GCallback     c_handler,
1591                          gpointer      gobject,
1592                          GConnectFlags connect_flags)
1593 {
1594   g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
1595   g_return_val_if_fail (detailed_signal != NULL, 0);
1596   g_return_val_if_fail (c_handler != NULL, 0);
1597
1598   if (gobject)
1599     {
1600       GClosure *closure;
1601
1602       g_return_val_if_fail (G_IS_OBJECT (gobject), 0);
1603
1604       closure = ((connect_flags & G_CONNECT_SWAPPED) ? g_cclosure_new_object_swap : g_cclosure_new_object) (c_handler, gobject);
1605
1606       return g_signal_connect_closure (instance, detailed_signal, closure, connect_flags & G_CONNECT_AFTER);
1607     }
1608   else
1609     return g_signal_connect_data (instance, detailed_signal, c_handler, NULL, NULL, connect_flags);
1610 }
1611
1612 typedef struct {
1613   GObject  *object;
1614   guint     n_closures;
1615   GClosure *closures[1]; /* flexible array */
1616 } CArray;
1617 /* don't change this structure without supplying an accessor for
1618  * watched closures, e.g.:
1619  * GSList* g_object_list_watched_closures (GObject *object)
1620  * {
1621  *   CArray *carray;
1622  *   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1623  *   carray = g_object_get_data (object, "GObject-closure-array");
1624  *   if (carray)
1625  *     {
1626  *       GSList *slist = NULL;
1627  *       guint i;
1628  *       for (i = 0; i < carray->n_closures; i++)
1629  *         slist = g_slist_prepend (slist, carray->closures[i]);
1630  *       return slist;
1631  *     }
1632  *   return NULL;
1633  * }
1634  */
1635
1636 static void
1637 object_remove_closure (gpointer  data,
1638                        GClosure *closure)
1639 {
1640   GObject *object = data;
1641   CArray *carray = g_object_get_qdata (object, quark_closure_array);
1642   guint i;
1643
1644   for (i = 0; i < carray->n_closures; i++)
1645     if (carray->closures[i] == closure)
1646       {
1647         carray->n_closures--;
1648         if (i < carray->n_closures)
1649           carray->closures[i] = carray->closures[carray->n_closures];
1650         return;
1651       }
1652   g_assert_not_reached ();
1653 }
1654
1655 static void
1656 destroy_closure_array (gpointer data)
1657 {
1658   CArray *carray = data;
1659   GObject *object = carray->object;
1660   guint i, n = carray->n_closures;
1661
1662   for (i = 0; i < n; i++)
1663     {
1664       GClosure *closure = carray->closures[i];
1665
1666       /* removing object_remove_closure() upfront is probably faster than
1667        * letting it fiddle with quark_closure_array which is empty anyways
1668        */
1669       g_closure_remove_invalidate_notifier (closure, object, object_remove_closure);
1670       g_closure_invalidate (closure);
1671     }
1672   g_free (carray);
1673 }
1674
1675 void
1676 g_object_watch_closure (GObject  *object,
1677                         GClosure *closure)
1678 {
1679   CArray *carray;
1680   guint i;
1681
1682   g_return_if_fail (G_IS_OBJECT (object));
1683   g_return_if_fail (closure != NULL);
1684   g_return_if_fail (closure->is_invalid == FALSE);
1685   g_return_if_fail (closure->in_marshal == FALSE);
1686   g_return_if_fail (object->ref_count > 0);     /* this doesn't work on finalizing objects */
1687
1688   g_closure_add_invalidate_notifier (closure, object, object_remove_closure);
1689   g_closure_add_marshal_guards (closure,
1690                                 object, (GClosureNotify) g_object_ref,
1691                                 object, (GClosureNotify) g_object_unref);
1692   carray = g_datalist_id_remove_no_notify (&object->qdata, quark_closure_array);
1693   if (!carray)
1694     {
1695       carray = g_renew (CArray, NULL, 1);
1696       carray->object = object;
1697       carray->n_closures = 1;
1698       i = 0;
1699     }
1700   else
1701     {
1702       i = carray->n_closures++;
1703       carray = g_realloc (carray, sizeof (*carray) + sizeof (carray->closures[0]) * i);
1704     }
1705   carray->closures[i] = closure;
1706   g_datalist_id_set_data_full (&object->qdata, quark_closure_array, carray, destroy_closure_array);
1707 }
1708
1709 GClosure*
1710 g_closure_new_object (guint    sizeof_closure,
1711                       GObject *object)
1712 {
1713   GClosure *closure;
1714
1715   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1716   g_return_val_if_fail (object->ref_count > 0, NULL);     /* this doesn't work on finalizing objects */
1717
1718   closure = g_closure_new_simple (sizeof_closure, object);
1719   g_object_watch_closure (object, closure);
1720
1721   return closure;
1722 }
1723
1724 GClosure*
1725 g_cclosure_new_object (GCallback callback_func,
1726                        GObject  *object)
1727 {
1728   GClosure *closure;
1729
1730   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1731   g_return_val_if_fail (object->ref_count > 0, NULL);     /* this doesn't work on finalizing objects */
1732   g_return_val_if_fail (callback_func != NULL, NULL);
1733
1734   closure = g_cclosure_new (callback_func, object, NULL);
1735   g_object_watch_closure (object, closure);
1736
1737   return closure;
1738 }
1739
1740 GClosure*
1741 g_cclosure_new_object_swap (GCallback callback_func,
1742                             GObject  *object)
1743 {
1744   GClosure *closure;
1745
1746   g_return_val_if_fail (G_IS_OBJECT (object), NULL);
1747   g_return_val_if_fail (object->ref_count > 0, NULL);     /* this doesn't work on finalizing objects */
1748   g_return_val_if_fail (callback_func != NULL, NULL);
1749
1750   closure = g_cclosure_new_swap (callback_func, object, NULL);
1751   g_object_watch_closure (object, closure);
1752
1753   return closure;
1754 }