qom/object.c

   1 /*
   2  * QEMU Object Model
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qom/object.h"
  14 #include "qemu-common.h"
  15 #include "qapi/visitor.h"
  16 #include "qapi-visit.h"
  17 #include "qapi/string-input-visitor.h"
  18 #include "qapi/string-output-visitor.h"
  19 #include "qapi/qmp/qerror.h"
  20 #include "trace.h"
  21
  22 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  23  * of the QOM core on QObject?  */
  24 #include "qom/qom-qobject.h"
  25 #include "qapi/qmp/qobject.h"
  26 #include "qapi/qmp/qbool.h"
  27 #include "qapi/qmp/qint.h"
  28 #include "qapi/qmp/qstring.h"
  29
  30 #define MAX_INTERFACES 32
  31
  32 typedef struct InterfaceImpl InterfaceImpl;
  33 typedef struct TypeImpl TypeImpl;
  34
  35 struct InterfaceImpl
  36 {
  37     const char *typename;
  38 };
  39
  40 struct TypeImpl
  41 {
  42     const char *name;
  43
  44     size_t class_size;
  45
  46     size_t instance_size;
  47
  48     void (*class_init)(ObjectClass *klass, void *data);
  49     void (*class_base_init)(ObjectClass *klass, void *data);
  50     void (*class_finalize)(ObjectClass *klass, void *data);
  51
  52     void *class_data;
  53
  54     void (*instance_init)(Object *obj);
  55     void (*instance_post_init)(Object *obj);
  56     void (*instance_finalize)(Object *obj);
  57
  58     bool abstract;
  59
  60     const char *parent;
  61     TypeImpl *parent_type;
  62
  63     ObjectClass *class;
  64
  65     int num_interfaces;
  66     InterfaceImpl interfaces[MAX_INTERFACES];
  67 };
  68
  69 static Type type_interface;
  70
  71 static GHashTable *type_table_get(void)
  72 {
  73     static GHashTable *type_table;
  74
  75     if (type_table == NULL) {
  76         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  77     }
  78
  79     return type_table;
  80 }
  81
  82 static bool enumerating_types;
  83
  84 static void type_table_add(TypeImpl *ti)
  85 {
  86     assert(!enumerating_types);
  87     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  88 }
  89
  90 static TypeImpl *type_table_lookup(const char *name)
  91 {
  92     return g_hash_table_lookup(type_table_get(), name);
  93 }
  94
  95 static TypeImpl *type_new(const TypeInfo *info)
  96 {
  97     TypeImpl *ti = g_malloc0(sizeof(*ti));
  98     int i;
  99
 100     g_assert(info->name != NULL);
 101
 102     if (type_table_lookup(info->name) != NULL) {
 103         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 104         abort();
 105     }
 106
 107     ti->name = g_strdup(info->name);
 108     ti->parent = g_strdup(info->parent);
 109
 110     ti->class_size = info->class_size;
 111     ti->instance_size = info->instance_size;
 112
 113     ti->class_init = info->class_init;
 114     ti->class_base_init = info->class_base_init;
 115     ti->class_finalize = info->class_finalize;
 116     ti->class_data = info->class_data;
 117
 118     ti->instance_init = info->instance_init;
 119     ti->instance_post_init = info->instance_post_init;
 120     ti->instance_finalize = info->instance_finalize;
 121
 122     ti->abstract = info->abstract;
 123
 124     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 125         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 126     }
 127     ti->num_interfaces = i;
 128
 129     return ti;
 130 }
 131
 132 static TypeImpl *type_register_internal(const TypeInfo *info)
 133 {
 134     TypeImpl *ti;
 135     ti = type_new(info);
 136
 137     type_table_add(ti);
 138     return ti;
 139 }
 140
 141 TypeImpl *type_register(const TypeInfo *info)
 142 {
 143     assert(info->parent);
 144     return type_register_internal(info);
 145 }
 146
 147 TypeImpl *type_register_static(const TypeInfo *info)
 148 {
 149     return type_register(info);
 150 }
 151
 152 static TypeImpl *type_get_by_name(const char *name)
 153 {
 154     if (name == NULL) {
 155         return NULL;
 156     }
 157
 158     return type_table_lookup(name);
 159 }
 160
 161 static TypeImpl *type_get_parent(TypeImpl *type)
 162 {
 163     if (!type->parent_type && type->parent) {
 164         type->parent_type = type_get_by_name(type->parent);
 165         g_assert(type->parent_type != NULL);
 166     }
 167
 168     return type->parent_type;
 169 }
 170
 171 static bool type_has_parent(TypeImpl *type)
 172 {
 173     return (type->parent != NULL);
 174 }
 175
 176 static size_t type_class_get_size(TypeImpl *ti)
 177 {
 178     if (ti->class_size) {
 179         return ti->class_size;
 180     }
 181
 182     if (type_has_parent(ti)) {
 183         return type_class_get_size(type_get_parent(ti));
 184     }
 185
 186     return sizeof(ObjectClass);
 187 }
 188
 189 static size_t type_object_get_size(TypeImpl *ti)
 190 {
 191     if (ti->instance_size) {
 192         return ti->instance_size;
 193     }
 194
 195     if (type_has_parent(ti)) {
 196         return type_object_get_size(type_get_parent(ti));
 197     }
 198
 199     return 0;
 200 }
 201
 202 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 203 {
 204     assert(target_type);
 205
 206     /* Check if typename is a direct ancestor of type */
 207     while (type) {
 208         if (type == target_type) {
 209             return true;
 210         }
 211
 212         type = type_get_parent(type);
 213     }
 214
 215     return false;
 216 }
 217
 218 static void type_initialize(TypeImpl *ti);
 219
 220 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 221                                       TypeImpl *parent_type)
 222 {
 223     InterfaceClass *new_iface;
 224     TypeInfo info = { };
 225     TypeImpl *iface_impl;
 226
 227     info.parent = parent_type->name;
 228     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 229     info.abstract = true;
 230
 231     iface_impl = type_new(&info);
 232     iface_impl->parent_type = parent_type;
 233     type_initialize(iface_impl);
 234     g_free((char *)info.name);
 235
 236     new_iface = (InterfaceClass *)iface_impl->class;
 237     new_iface->concrete_class = ti->class;
 238     new_iface->interface_type = interface_type;
 239
 240     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 241                                            iface_impl->class);
 242 }
 243
 244 static void type_initialize(TypeImpl *ti)
 245 {
 246     TypeImpl *parent;
 247
 248     if (ti->class) {
 249         return;
 250     }
 251
 252     ti->class_size = type_class_get_size(ti);
 253     ti->instance_size = type_object_get_size(ti);
 254
 255     ti->class = g_malloc0(ti->class_size);
 256
 257     parent = type_get_parent(ti);
 258     if (parent) {
 259         type_initialize(parent);
 260         GSList *e;
 261         int i;
 262
 263         g_assert(parent->class_size <= ti->class_size);
 264         memcpy(ti->class, parent->class, parent->class_size);
 265         ti->class->interfaces = NULL;
 266
 267         for (e = parent->class->interfaces; e; e = e->next) {
 268             InterfaceClass *iface = e->data;
 269             ObjectClass *klass = OBJECT_CLASS(iface);
 270
 271             type_initialize_interface(ti, iface->interface_type, klass->type);
 272         }
 273
 274         for (i = 0; i < ti->num_interfaces; i++) {
 275             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 276             for (e = ti->class->interfaces; e; e = e->next) {
 277                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 278
 279                 if (type_is_ancestor(target_type, t)) {
 280                     break;
 281                 }
 282             }
 283
 284             if (e) {
 285                 continue;
 286             }
 287
 288             type_initialize_interface(ti, t, t);
 289         }
 290     }
 291
 292     ti->class->type = ti;
 293
 294     while (parent) {
 295         if (parent->class_base_init) {
 296             parent->class_base_init(ti->class, ti->class_data);
 297         }
 298         parent = type_get_parent(parent);
 299     }
 300
 301     if (ti->class_init) {
 302         ti->class_init(ti->class, ti->class_data);
 303     }
 304 }
 305
 306 static void object_init_with_type(Object *obj, TypeImpl *ti)
 307 {
 308     if (type_has_parent(ti)) {
 309         object_init_with_type(obj, type_get_parent(ti));
 310     }
 311
 312     if (ti->instance_init) {
 313         ti->instance_init(obj);
 314     }
 315 }
 316
 317 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 318 {
 319     if (ti->instance_post_init) {
 320         ti->instance_post_init(obj);
 321     }
 322
 323     if (type_has_parent(ti)) {
 324         object_post_init_with_type(obj, type_get_parent(ti));
 325     }
 326 }
 327
 328 void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 329 {
 330     Object *obj = data;
 331
 332     g_assert(type != NULL);
 333     type_initialize(type);
 334
 335     g_assert(type->instance_size >= sizeof(Object));
 336     g_assert(type->abstract == false);
 337     g_assert(size >= type->instance_size);
 338
 339     memset(obj, 0, type->instance_size);
 340     obj->class = type->class;
 341     object_ref(obj);
 342     QTAILQ_INIT(&obj->properties);
 343     object_init_with_type(obj, type);
 344     object_post_init_with_type(obj, type);
 345 }
 346
 347 void object_initialize(void *data, size_t size, const char *typename)
 348 {
 349     TypeImpl *type = type_get_by_name(typename);
 350
 351     object_initialize_with_type(data, size, type);
 352 }
 353
 354 static inline bool object_property_is_child(ObjectProperty *prop)
 355 {
 356     return strstart(prop->type, "child<", NULL);
 357 }
 358
 359 static void object_property_del_all(Object *obj)
 360 {
 361     while (!QTAILQ_EMPTY(&obj->properties)) {
 362         ObjectProperty *prop = QTAILQ_FIRST(&obj->properties);
 363
 364         QTAILQ_REMOVE(&obj->properties, prop, node);
 365
 366         if (prop->release) {
 367             prop->release(obj, prop->name, prop->opaque);
 368         }
 369
 370         g_free(prop->name);
 371         g_free(prop->type);
 372         g_free(prop);
 373     }
 374 }
 375
 376 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 377 {
 378     ObjectProperty *prop;
 379
 380     QTAILQ_FOREACH(prop, &obj->properties, node) {
 381         if (object_property_is_child(prop) && prop->opaque == child) {
 382             object_property_del(obj, prop->name, errp);
 383             break;
 384         }
 385     }
 386 }
 387
 388 void object_unparent(Object *obj)
 389 {
 390     if (!obj->parent) {
 391         return;
 392     }
 393
 394     object_ref(obj);
 395     if (obj->class->unparent) {
 396         (obj->class->unparent)(obj);
 397     }
 398     if (obj->parent) {
 399         object_property_del_child(obj->parent, obj, NULL);
 400         obj->parent = NULL;
 401     }
 402     object_unref(obj);
 403 }
 404
 405 static void object_deinit(Object *obj, TypeImpl *type)
 406 {
 407     if (type->instance_finalize) {
 408         type->instance_finalize(obj);
 409     }
 410
 411     if (type_has_parent(type)) {
 412         object_deinit(obj, type_get_parent(type));
 413     }
 414 }
 415
 416 static void object_finalize(void *data)
 417 {
 418     Object *obj = data;
 419     TypeImpl *ti = obj->class->type;
 420
 421     object_deinit(obj, ti);
 422     object_property_del_all(obj);
 423
 424     g_assert(obj->ref == 0);
 425     if (obj->free) {
 426         obj->free(obj);
 427     }
 428 }
 429
 430 Object *object_new_with_type(Type type)
 431 {
 432     Object *obj;
 433
 434     g_assert(type != NULL);
 435     type_initialize(type);
 436
 437     obj = g_malloc(type->instance_size);
 438     object_initialize_with_type(obj, type->instance_size, type);
 439     obj->free = g_free;
 440
 441     return obj;
 442 }
 443
 444 Object *object_new(const char *typename)
 445 {
 446     TypeImpl *ti = type_get_by_name(typename);
 447
 448     return object_new_with_type(ti);
 449 }
 450
 451 Object *object_dynamic_cast(Object *obj, const char *typename)
 452 {
 453     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 454         return obj;
 455     }
 456
 457     return NULL;
 458 }
 459
 460 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 461                                    const char *file, int line, const char *func)
 462 {
 463     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 464                                      typename, file, line, func);
 465
 466 #ifdef CONFIG_QOM_CAST_DEBUG
 467     int i;
 468     Object *inst;
 469
 470     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 471         if (obj->class->object_cast_cache[i] == typename) {
 472             goto out;
 473         }
 474     }
 475
 476     inst = object_dynamic_cast(obj, typename);
 477
 478     if (!inst && obj) {
 479         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 480                 file, line, func, obj, typename);
 481         abort();
 482     }
 483
 484     assert(obj == inst);
 485
 486     if (obj && obj == inst) {
 487         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 488             obj->class->object_cast_cache[i - 1] =
 489                     obj->class->object_cast_cache[i];
 490         }
 491         obj->class->object_cast_cache[i - 1] = typename;
 492     }
 493
 494 out:
 495 #endif
 496     return obj;
 497 }
 498
 499 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 500                                        const char *typename)
 501 {
 502     ObjectClass *ret = NULL;
 503     TypeImpl *target_type;
 504     TypeImpl *type;
 505
 506     if (!class) {
 507         return NULL;
 508     }
 509
 510     /* A simple fast path that can trigger a lot for leaf classes.  */
 511     type = class->type;
 512     if (type->name == typename) {
 513         return class;
 514     }
 515
 516     target_type = type_get_by_name(typename);
 517     if (!target_type) {
 518         /* target class type unknown, so fail the cast */
 519         return NULL;
 520     }
 521
 522     if (type->class->interfaces &&
 523             type_is_ancestor(target_type, type_interface)) {
 524         int found = 0;
 525         GSList *i;
 526
 527         for (i = class->interfaces; i; i = i->next) {
 528             ObjectClass *target_class = i->data;
 529
 530             if (type_is_ancestor(target_class->type, target_type)) {
 531                 ret = target_class;
 532                 found++;
 533             }
 534          }
 535
 536         /* The match was ambiguous, don't allow a cast */
 537         if (found > 1) {
 538             ret = NULL;
 539         }
 540     } else if (type_is_ancestor(type, target_type)) {
 541         ret = class;
 542     }
 543
 544     return ret;
 545 }
 546
 547 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 548                                               const char *typename,
 549                                               const char *file, int line,
 550                                               const char *func)
 551 {
 552     ObjectClass *ret;
 553
 554     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 555                                            typename, file, line, func);
 556
 557 #ifdef CONFIG_QOM_CAST_DEBUG
 558     int i;
 559
 560     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 561         if (class->class_cast_cache[i] == typename) {
 562             ret = class;
 563             goto out;
 564         }
 565     }
 566 #else
 567     if (!class || !class->interfaces) {
 568         return class;
 569     }
 570 #endif
 571
 572     ret = object_class_dynamic_cast(class, typename);
 573     if (!ret && class) {
 574         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 575                 file, line, func, class, typename);
 576         abort();
 577     }
 578
 579 #ifdef CONFIG_QOM_CAST_DEBUG
 580     if (class && ret == class) {
 581         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 582             class->class_cast_cache[i - 1] = class->class_cast_cache[i];
 583         }
 584         class->class_cast_cache[i - 1] = typename;
 585     }
 586 out:
 587 #endif
 588     return ret;
 589 }
 590
 591 const char *object_get_typename(Object *obj)
 592 {
 593     return obj->class->type->name;
 594 }
 595
 596 ObjectClass *object_get_class(Object *obj)
 597 {
 598     return obj->class;
 599 }
 600
 601 bool object_class_is_abstract(ObjectClass *klass)
 602 {
 603     return klass->type->abstract;
 604 }
 605
 606 const char *object_class_get_name(ObjectClass *klass)
 607 {
 608     return klass->type->name;
 609 }
 610
 611 ObjectClass *object_class_by_name(const char *typename)
 612 {
 613     TypeImpl *type = type_get_by_name(typename);
 614
 615     if (!type) {
 616         return NULL;
 617     }
 618
 619     type_initialize(type);
 620
 621     return type->class;
 622 }
 623
 624 ObjectClass *object_class_get_parent(ObjectClass *class)
 625 {
 626     TypeImpl *type = type_get_parent(class->type);
 627
 628     if (!type) {
 629         return NULL;
 630     }
 631
 632     type_initialize(type);
 633
 634     return type->class;
 635 }
 636
 637 typedef struct OCFData
 638 {
 639     void (*fn)(ObjectClass *klass, void *opaque);
 640     const char *implements_type;
 641     bool include_abstract;
 642     void *opaque;
 643 } OCFData;
 644
 645 static void object_class_foreach_tramp(gpointer key, gpointer value,
 646                                        gpointer opaque)
 647 {
 648     OCFData *data = opaque;
 649     TypeImpl *type = value;
 650     ObjectClass *k;
 651
 652     type_initialize(type);
 653     k = type->class;
 654
 655     if (!data->include_abstract && type->abstract) {
 656         return;
 657     }
 658
 659     if (data->implements_type &&
 660         !object_class_dynamic_cast(k, data->implements_type)) {
 661         return;
 662     }
 663
 664     data->fn(k, data->opaque);
 665 }
 666
 667 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 668                           const char *implements_type, bool include_abstract,
 669                           void *opaque)
 670 {
 671     OCFData data = { fn, implements_type, include_abstract, opaque };
 672
 673     enumerating_types = true;
 674     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 675     enumerating_types = false;
 676 }
 677
 678 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 679                          void *opaque)
 680 {
 681     ObjectProperty *prop;
 682     int ret = 0;
 683
 684     QTAILQ_FOREACH(prop, &obj->properties, node) {
 685         if (object_property_is_child(prop)) {
 686             ret = fn(prop->opaque, opaque);
 687             if (ret != 0) {
 688                 break;
 689             }
 690         }
 691     }
 692     return ret;
 693 }
 694
 695 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 696 {
 697     GSList **list = opaque;
 698
 699     *list = g_slist_prepend(*list, klass);
 700 }
 701
 702 GSList *object_class_get_list(const char *implements_type,
 703                               bool include_abstract)
 704 {
 705     GSList *list = NULL;
 706
 707     object_class_foreach(object_class_get_list_tramp,
 708                          implements_type, include_abstract, &list);
 709     return list;
 710 }
 711
 712 void object_ref(Object *obj)
 713 {
 714     if (!obj) {
 715         return;
 716     }
 717      atomic_inc(&obj->ref);
 718 }
 719
 720 void object_unref(Object *obj)
 721 {
 722     if (!obj) {
 723         return;
 724     }
 725     g_assert(obj->ref > 0);
 726
 727     /* parent always holds a reference to its children */
 728     if (atomic_fetch_dec(&obj->ref) == 1) {
 729         object_finalize(obj);
 730     }
 731 }
 732
 733 ObjectProperty *
 734 object_property_add(Object *obj, const char *name, const char *type,
 735                     ObjectPropertyAccessor *get,
 736                     ObjectPropertyAccessor *set,
 737                     ObjectPropertyRelease *release,
 738                     void *opaque, Error **errp)
 739 {
 740     ObjectProperty *prop;
 741
 742     QTAILQ_FOREACH(prop, &obj->properties, node) {
 743         if (strcmp(prop->name, name) == 0) {
 744             error_setg(errp, "attempt to add duplicate property '%s'"
 745                        " to object (type '%s')", name,
 746                        object_get_typename(obj));
 747             return NULL;
 748         }
 749     }
 750
 751     prop = g_malloc0(sizeof(*prop));
 752
 753     prop->name = g_strdup(name);
 754     prop->type = g_strdup(type);
 755
 756     prop->get = get;
 757     prop->set = set;
 758     prop->release = release;
 759     prop->opaque = opaque;
 760
 761     QTAILQ_INSERT_TAIL(&obj->properties, prop, node);
 762     return prop;
 763 }
 764
 765 ObjectProperty *object_property_find(Object *obj, const char *name,
 766                                      Error **errp)
 767 {
 768     ObjectProperty *prop;
 769
 770     QTAILQ_FOREACH(prop, &obj->properties, node) {
 771         if (strcmp(prop->name, name) == 0) {
 772             return prop;
 773         }
 774     }
 775
 776     error_setg(errp, "Property '.%s' not found", name);
 777     return NULL;
 778 }
 779
 780 void object_property_del(Object *obj, const char *name, Error **errp)
 781 {
 782     ObjectProperty *prop = object_property_find(obj, name, errp);
 783     if (prop == NULL) {
 784         return;
 785     }
 786
 787     if (prop->release) {
 788         prop->release(obj, name, prop->opaque);
 789     }
 790
 791     QTAILQ_REMOVE(&obj->properties, prop, node);
 792
 793     g_free(prop->name);
 794     g_free(prop->type);
 795     g_free(prop);
 796 }
 797
 798 void object_property_get(Object *obj, Visitor *v, const char *name,
 799                          Error **errp)
 800 {
 801     ObjectProperty *prop = object_property_find(obj, name, errp);
 802     if (prop == NULL) {
 803         return;
 804     }
 805
 806     if (!prop->get) {
 807         error_set(errp, QERR_PERMISSION_DENIED);
 808     } else {
 809         prop->get(obj, v, prop->opaque, name, errp);
 810     }
 811 }
 812
 813 void object_property_set(Object *obj, Visitor *v, const char *name,
 814                          Error **errp)
 815 {
 816     ObjectProperty *prop = object_property_find(obj, name, errp);
 817     if (prop == NULL) {
 818         return;
 819     }
 820
 821     if (!prop->set) {
 822         error_set(errp, QERR_PERMISSION_DENIED);
 823     } else {
 824         prop->set(obj, v, prop->opaque, name, errp);
 825     }
 826 }
 827
 828 void object_property_set_str(Object *obj, const char *value,
 829                              const char *name, Error **errp)
 830 {
 831     QString *qstr = qstring_from_str(value);
 832     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
 833
 834     QDECREF(qstr);
 835 }
 836
 837 char *object_property_get_str(Object *obj, const char *name,
 838                               Error **errp)
 839 {
 840     QObject *ret = object_property_get_qobject(obj, name, errp);
 841     QString *qstring;
 842     char *retval;
 843
 844     if (!ret) {
 845         return NULL;
 846     }
 847     qstring = qobject_to_qstring(ret);
 848     if (!qstring) {
 849         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
 850         retval = NULL;
 851     } else {
 852         retval = g_strdup(qstring_get_str(qstring));
 853     }
 854
 855     QDECREF(qstring);
 856     return retval;
 857 }
 858
 859 void object_property_set_link(Object *obj, Object *value,
 860                               const char *name, Error **errp)
 861 {
 862     gchar *path = object_get_canonical_path(value);
 863     object_property_set_str(obj, path, name, errp);
 864     g_free(path);
 865 }
 866
 867 Object *object_property_get_link(Object *obj, const char *name,
 868                                  Error **errp)
 869 {
 870     char *str = object_property_get_str(obj, name, errp);
 871     Object *target = NULL;
 872
 873     if (str && *str) {
 874         target = object_resolve_path(str, NULL);
 875         if (!target) {
 876             error_set(errp, QERR_DEVICE_NOT_FOUND, str);
 877         }
 878     }
 879
 880     g_free(str);
 881     return target;
 882 }
 883
 884 void object_property_set_bool(Object *obj, bool value,
 885                               const char *name, Error **errp)
 886 {
 887     QBool *qbool = qbool_from_int(value);
 888     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
 889
 890     QDECREF(qbool);
 891 }
 892
 893 bool object_property_get_bool(Object *obj, const char *name,
 894                               Error **errp)
 895 {
 896     QObject *ret = object_property_get_qobject(obj, name, errp);
 897     QBool *qbool;
 898     bool retval;
 899
 900     if (!ret) {
 901         return false;
 902     }
 903     qbool = qobject_to_qbool(ret);
 904     if (!qbool) {
 905         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
 906         retval = false;
 907     } else {
 908         retval = qbool_get_int(qbool);
 909     }
 910
 911     QDECREF(qbool);
 912     return retval;
 913 }
 914
 915 void object_property_set_int(Object *obj, int64_t value,
 916                              const char *name, Error **errp)
 917 {
 918     QInt *qint = qint_from_int(value);
 919     object_property_set_qobject(obj, QOBJECT(qint), name, errp);
 920
 921     QDECREF(qint);
 922 }
 923
 924 int64_t object_property_get_int(Object *obj, const char *name,
 925                                 Error **errp)
 926 {
 927     QObject *ret = object_property_get_qobject(obj, name, errp);
 928     QInt *qint;
 929     int64_t retval;
 930
 931     if (!ret) {
 932         return -1;
 933     }
 934     qint = qobject_to_qint(ret);
 935     if (!qint) {
 936         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
 937         retval = -1;
 938     } else {
 939         retval = qint_get_int(qint);
 940     }
 941
 942     QDECREF(qint);
 943     return retval;
 944 }
 945
 946 int object_property_get_enum(Object *obj, const char *name,
 947                              const char *strings[], Error **errp)
 948 {
 949     StringOutputVisitor *sov;
 950     StringInputVisitor *siv;
 951     int ret;
 952
 953     sov = string_output_visitor_new(false);
 954     object_property_get(obj, string_output_get_visitor(sov), name, errp);
 955     siv = string_input_visitor_new(string_output_get_string(sov));
 956     string_output_visitor_cleanup(sov);
 957     visit_type_enum(string_input_get_visitor(siv),
 958                     &ret, strings, NULL, name, errp);
 959     string_input_visitor_cleanup(siv);
 960
 961     return ret;
 962 }
 963
 964 void object_property_get_uint16List(Object *obj, const char *name,
 965                                     uint16List **list, Error **errp)
 966 {
 967     StringOutputVisitor *ov;
 968     StringInputVisitor *iv;
 969
 970     ov = string_output_visitor_new(false);
 971     object_property_get(obj, string_output_get_visitor(ov),
 972                         name, errp);
 973     iv = string_input_visitor_new(string_output_get_string(ov));
 974     visit_type_uint16List(string_input_get_visitor(iv),
 975                           list, NULL, errp);
 976     string_output_visitor_cleanup(ov);
 977     string_input_visitor_cleanup(iv);
 978 }
 979
 980 void object_property_parse(Object *obj, const char *string,
 981                            const char *name, Error **errp)
 982 {
 983     StringInputVisitor *mi;
 984     mi = string_input_visitor_new(string);
 985     object_property_set(obj, string_input_get_visitor(mi), name, errp);
 986
 987     string_input_visitor_cleanup(mi);
 988 }
 989
 990 char *object_property_print(Object *obj, const char *name, bool human,
 991                             Error **errp)
 992 {
 993     StringOutputVisitor *mo;
 994     char *string;
 995
 996     mo = string_output_visitor_new(human);
 997     object_property_get(obj, string_output_get_visitor(mo), name, errp);
 998     string = string_output_get_string(mo);
 999     string_output_visitor_cleanup(mo);
1000     return string;
1001 }
1002
1003 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1004 {
1005     ObjectProperty *prop = object_property_find(obj, name, errp);
1006     if (prop == NULL) {
1007         return NULL;
1008     }
1009
1010     return prop->type;
1011 }
1012
1013 Object *object_get_root(void)
1014 {
1015     static Object *root;
1016
1017     if (!root) {
1018         root = object_new("container");
1019     }
1020
1021     return root;
1022 }
1023
1024 static void object_get_child_property(Object *obj, Visitor *v, void *opaque,
1025                                       const char *name, Error **errp)
1026 {
1027     Object *child = opaque;
1028     gchar *path;
1029
1030     path = object_get_canonical_path(child);
1031     visit_type_str(v, &path, name, errp);
1032     g_free(path);
1033 }
1034
1035 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1036 {
1037     return opaque;
1038 }
1039
1040 static void object_finalize_child_property(Object *obj, const char *name,
1041                                            void *opaque)
1042 {
1043     Object *child = opaque;
1044
1045     object_unref(child);
1046 }
1047
1048 void object_property_add_child(Object *obj, const char *name,
1049                                Object *child, Error **errp)
1050 {
1051     Error *local_err = NULL;
1052     gchar *type;
1053     ObjectProperty *op;
1054
1055     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1056
1057     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1058                              object_finalize_child_property, child, &local_err);
1059     if (local_err) {
1060         error_propagate(errp, local_err);
1061         goto out;
1062     }
1063
1064     op->resolve = object_resolve_child_property;
1065     object_ref(child);
1066     g_assert(child->parent == NULL);
1067     child->parent = obj;
1068
1069 out:
1070     g_free(type);
1071 }
1072
1073 void object_property_allow_set_link(Object *obj, const char *name,
1074                                     Object *val, Error **errp)
1075 {
1076     /* Allow the link to be set, always */
1077 }
1078
1079 typedef struct {
1080     Object **child;
1081     void (*check)(Object *, const char *, Object *, Error **);
1082     ObjectPropertyLinkFlags flags;
1083 } LinkProperty;
1084
1085 static void object_get_link_property(Object *obj, Visitor *v, void *opaque,
1086                                      const char *name, Error **errp)
1087 {
1088     LinkProperty *lprop = opaque;
1089     Object **child = lprop->child;
1090     gchar *path;
1091
1092     if (*child) {
1093         path = object_get_canonical_path(*child);
1094         visit_type_str(v, &path, name, errp);
1095         g_free(path);
1096     } else {
1097         path = (gchar *)"";
1098         visit_type_str(v, &path, name, errp);
1099     }
1100 }
1101
1102 /*
1103  * object_resolve_link:
1104  *
1105  * Lookup an object and ensure its type matches the link property type.  This
1106  * is similar to object_resolve_path() except type verification against the
1107  * link property is performed.
1108  *
1109  * Returns: The matched object or NULL on path lookup failures.
1110  */
1111 static Object *object_resolve_link(Object *obj, const char *name,
1112                                    const char *path, Error **errp)
1113 {
1114     const char *type;
1115     gchar *target_type;
1116     bool ambiguous = false;
1117     Object *target;
1118
1119     /* Go from link<FOO> to FOO.  */
1120     type = object_property_get_type(obj, name, NULL);
1121     target_type = g_strndup(&type[5], strlen(type) - 6);
1122     target = object_resolve_path_type(path, target_type, &ambiguous);
1123
1124     if (ambiguous) {
1125         error_set(errp, ERROR_CLASS_GENERIC_ERROR,
1126                   "Path '%s' does not uniquely identify an object", path);
1127     } else if (!target) {
1128         target = object_resolve_path(path, &ambiguous);
1129         if (target || ambiguous) {
1130             error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1131         } else {
1132             error_set(errp, QERR_DEVICE_NOT_FOUND, path);
1133         }
1134         target = NULL;
1135     }
1136     g_free(target_type);
1137
1138     return target;
1139 }
1140
1141 static void object_set_link_property(Object *obj, Visitor *v, void *opaque,
1142                                      const char *name, Error **errp)
1143 {
1144     Error *local_err = NULL;
1145     LinkProperty *prop = opaque;
1146     Object **child = prop->child;
1147     Object *old_target = *child;
1148     Object *new_target = NULL;
1149     char *path = NULL;
1150
1151     visit_type_str(v, &path, name, &local_err);
1152
1153     if (!local_err && strcmp(path, "") != 0) {
1154         new_target = object_resolve_link(obj, name, path, &local_err);
1155     }
1156
1157     g_free(path);
1158     if (local_err) {
1159         error_propagate(errp, local_err);
1160         return;
1161     }
1162
1163     prop->check(obj, name, new_target, &local_err);
1164     if (local_err) {
1165         error_propagate(errp, local_err);
1166         return;
1167     }
1168
1169     object_ref(new_target);
1170     *child = new_target;
1171     object_unref(old_target);
1172 }
1173
1174 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1175 {
1176     LinkProperty *lprop = opaque;
1177
1178     return *lprop->child;
1179 }
1180
1181 static void object_release_link_property(Object *obj, const char *name,
1182                                          void *opaque)
1183 {
1184     LinkProperty *prop = opaque;
1185
1186     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1187         object_unref(*prop->child);
1188     }
1189     g_free(prop);
1190 }
1191
1192 void object_property_add_link(Object *obj, const char *name,
1193                               const char *type, Object **child,
1194                               void (*check)(Object *, const char *,
1195                                             Object *, Error **),
1196                               ObjectPropertyLinkFlags flags,
1197                               Error **errp)
1198 {
1199     Error *local_err = NULL;
1200     LinkProperty *prop = g_malloc(sizeof(*prop));
1201     gchar *full_type;
1202     ObjectProperty *op;
1203
1204     prop->child = child;
1205     prop->check = check;
1206     prop->flags = flags;
1207
1208     full_type = g_strdup_printf("link<%s>", type);
1209
1210     op = object_property_add(obj, name, full_type,
1211                              object_get_link_property,
1212                              check ? object_set_link_property : NULL,
1213                              object_release_link_property,
1214                              prop,
1215                              &local_err);
1216     if (local_err) {
1217         error_propagate(errp, local_err);
1218         g_free(prop);
1219         goto out;
1220     }
1221
1222     op->resolve = object_resolve_link_property;
1223
1224 out:
1225     g_free(full_type);
1226 }
1227
1228 gchar *object_get_canonical_path_component(Object *obj)
1229 {
1230     ObjectProperty *prop = NULL;
1231
1232     g_assert(obj);
1233     g_assert(obj->parent != NULL);
1234
1235     QTAILQ_FOREACH(prop, &obj->parent->properties, node) {
1236         if (!object_property_is_child(prop)) {
1237             continue;
1238         }
1239
1240         if (prop->opaque == obj) {
1241             return g_strdup(prop->name);
1242         }
1243     }
1244
1245     /* obj had a parent but was not a child, should never happen */
1246     g_assert_not_reached();
1247     return NULL;
1248 }
1249
1250 gchar *object_get_canonical_path(Object *obj)
1251 {
1252     Object *root = object_get_root();
1253     char *newpath, *path = NULL;
1254
1255     while (obj != root) {
1256         char *component = object_get_canonical_path_component(obj);
1257
1258         if (path) {
1259             newpath = g_strdup_printf("%s/%s", component, path);
1260             g_free(component);
1261             g_free(path);
1262             path = newpath;
1263         } else {
1264             path = component;
1265         }
1266
1267         obj = obj->parent;
1268     }
1269
1270     newpath = g_strdup_printf("/%s", path ? path : "");
1271     g_free(path);
1272
1273     return newpath;
1274 }
1275
1276 Object *object_resolve_path_component(Object *parent, const gchar *part)
1277 {
1278     ObjectProperty *prop = object_property_find(parent, part, NULL);
1279     if (prop == NULL) {
1280         return NULL;
1281     }
1282
1283     if (prop->resolve) {
1284         return prop->resolve(parent, prop->opaque, part);
1285     } else {
1286         return NULL;
1287     }
1288 }
1289
1290 static Object *object_resolve_abs_path(Object *parent,
1291                                           gchar **parts,
1292                                           const char *typename,
1293                                           int index)
1294 {
1295     Object *child;
1296
1297     if (parts[index] == NULL) {
1298         return object_dynamic_cast(parent, typename);
1299     }
1300
1301     if (strcmp(parts[index], "") == 0) {
1302         return object_resolve_abs_path(parent, parts, typename, index + 1);
1303     }
1304
1305     child = object_resolve_path_component(parent, parts[index]);
1306     if (!child) {
1307         return NULL;
1308     }
1309
1310     return object_resolve_abs_path(child, parts, typename, index + 1);
1311 }
1312
1313 static Object *object_resolve_partial_path(Object *parent,
1314                                               gchar **parts,
1315                                               const char *typename,
1316                                               bool *ambiguous)
1317 {
1318     Object *obj;
1319     ObjectProperty *prop;
1320
1321     obj = object_resolve_abs_path(parent, parts, typename, 0);
1322
1323     QTAILQ_FOREACH(prop, &parent->properties, node) {
1324         Object *found;
1325
1326         if (!object_property_is_child(prop)) {
1327             continue;
1328         }
1329
1330         found = object_resolve_partial_path(prop->opaque, parts,
1331                                             typename, ambiguous);
1332         if (found) {
1333             if (obj) {
1334                 if (ambiguous) {
1335                     *ambiguous = true;
1336                 }
1337                 return NULL;
1338             }
1339             obj = found;
1340         }
1341
1342         if (ambiguous && *ambiguous) {
1343             return NULL;
1344         }
1345     }
1346
1347     return obj;
1348 }
1349
1350 Object *object_resolve_path_type(const char *path, const char *typename,
1351                                  bool *ambiguous)
1352 {
1353     Object *obj;
1354     gchar **parts;
1355
1356     parts = g_strsplit(path, "/", 0);
1357     assert(parts);
1358
1359     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1360         if (ambiguous) {
1361             *ambiguous = false;
1362         }
1363         obj = object_resolve_partial_path(object_get_root(), parts,
1364                                           typename, ambiguous);
1365     } else {
1366         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1367     }
1368
1369     g_strfreev(parts);
1370
1371     return obj;
1372 }
1373
1374 Object *object_resolve_path(const char *path, bool *ambiguous)
1375 {
1376     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1377 }
1378
1379 typedef struct StringProperty
1380 {
1381     char *(*get)(Object *, Error **);
1382     void (*set)(Object *, const char *, Error **);
1383 } StringProperty;
1384
1385 static void property_get_str(Object *obj, Visitor *v, void *opaque,
1386                              const char *name, Error **errp)
1387 {
1388     StringProperty *prop = opaque;
1389     char *value;
1390
1391     value = prop->get(obj, errp);
1392     if (value) {
1393         visit_type_str(v, &value, name, errp);
1394         g_free(value);
1395     }
1396 }
1397
1398 static void property_set_str(Object *obj, Visitor *v, void *opaque,
1399                              const char *name, Error **errp)
1400 {
1401     StringProperty *prop = opaque;
1402     char *value;
1403     Error *local_err = NULL;
1404
1405     visit_type_str(v, &value, name, &local_err);
1406     if (local_err) {
1407         error_propagate(errp, local_err);
1408         return;
1409     }
1410
1411     prop->set(obj, value, errp);
1412     g_free(value);
1413 }
1414
1415 static void property_release_str(Object *obj, const char *name,
1416                                  void *opaque)
1417 {
1418     StringProperty *prop = opaque;
1419     g_free(prop);
1420 }
1421
1422 void object_property_add_str(Object *obj, const char *name,
1423                            char *(*get)(Object *, Error **),
1424                            void (*set)(Object *, const char *, Error **),
1425                            Error **errp)
1426 {
1427     Error *local_err = NULL;
1428     StringProperty *prop = g_malloc0(sizeof(*prop));
1429
1430     prop->get = get;
1431     prop->set = set;
1432
1433     object_property_add(obj, name, "string",
1434                         get ? property_get_str : NULL,
1435                         set ? property_set_str : NULL,
1436                         property_release_str,
1437                         prop, &local_err);
1438     if (local_err) {
1439         error_propagate(errp, local_err);
1440         g_free(prop);
1441     }
1442 }
1443
1444 typedef struct BoolProperty
1445 {
1446     bool (*get)(Object *, Error **);
1447     void (*set)(Object *, bool, Error **);
1448 } BoolProperty;
1449
1450 static void property_get_bool(Object *obj, Visitor *v, void *opaque,
1451                               const char *name, Error **errp)
1452 {
1453     BoolProperty *prop = opaque;
1454     bool value;
1455
1456     value = prop->get(obj, errp);
1457     visit_type_bool(v, &value, name, errp);
1458 }
1459
1460 static void property_set_bool(Object *obj, Visitor *v, void *opaque,
1461                               const char *name, Error **errp)
1462 {
1463     BoolProperty *prop = opaque;
1464     bool value;
1465     Error *local_err = NULL;
1466
1467     visit_type_bool(v, &value, name, &local_err);
1468     if (local_err) {
1469         error_propagate(errp, local_err);
1470         return;
1471     }
1472
1473     prop->set(obj, value, errp);
1474 }
1475
1476 static void property_release_bool(Object *obj, const char *name,
1477                                   void *opaque)
1478 {
1479     BoolProperty *prop = opaque;
1480     g_free(prop);
1481 }
1482
1483 void object_property_add_bool(Object *obj, const char *name,
1484                               bool (*get)(Object *, Error **),
1485                               void (*set)(Object *, bool, Error **),
1486                               Error **errp)
1487 {
1488     Error *local_err = NULL;
1489     BoolProperty *prop = g_malloc0(sizeof(*prop));
1490
1491     prop->get = get;
1492     prop->set = set;
1493
1494     object_property_add(obj, name, "bool",
1495                         get ? property_get_bool : NULL,
1496                         set ? property_set_bool : NULL,
1497                         property_release_bool,
1498                         prop, &local_err);
1499     if (local_err) {
1500         error_propagate(errp, local_err);
1501         g_free(prop);
1502     }
1503 }
1504
1505 static char *qdev_get_type(Object *obj, Error **errp)
1506 {
1507     return g_strdup(object_get_typename(obj));
1508 }
1509
1510 static void property_get_uint8_ptr(Object *obj, Visitor *v,
1511                                    void *opaque, const char *name,
1512                                    Error **errp)
1513 {
1514     uint8_t value = *(uint8_t *)opaque;
1515     visit_type_uint8(v, &value, name, errp);
1516 }
1517
1518 static void property_get_uint16_ptr(Object *obj, Visitor *v,
1519                                    void *opaque, const char *name,
1520                                    Error **errp)
1521 {
1522     uint16_t value = *(uint16_t *)opaque;
1523     visit_type_uint16(v, &value, name, errp);
1524 }
1525
1526 static void property_get_uint32_ptr(Object *obj, Visitor *v,
1527                                    void *opaque, const char *name,
1528                                    Error **errp)
1529 {
1530     uint32_t value = *(uint32_t *)opaque;
1531     visit_type_uint32(v, &value, name, errp);
1532 }
1533
1534 static void property_get_uint64_ptr(Object *obj, Visitor *v,
1535                                    void *opaque, const char *name,
1536                                    Error **errp)
1537 {
1538     uint64_t value = *(uint64_t *)opaque;
1539     visit_type_uint64(v, &value, name, errp);
1540 }
1541
1542 void object_property_add_uint8_ptr(Object *obj, const char *name,
1543                                    const uint8_t *v, Error **errp)
1544 {
1545     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
1546                         NULL, NULL, (void *)v, errp);
1547 }
1548
1549 void object_property_add_uint16_ptr(Object *obj, const char *name,
1550                                     const uint16_t *v, Error **errp)
1551 {
1552     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
1553                         NULL, NULL, (void *)v, errp);
1554 }
1555
1556 void object_property_add_uint32_ptr(Object *obj, const char *name,
1557                                     const uint32_t *v, Error **errp)
1558 {
1559     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
1560                         NULL, NULL, (void *)v, errp);
1561 }
1562
1563 void object_property_add_uint64_ptr(Object *obj, const char *name,
1564                                     const uint64_t *v, Error **errp)
1565 {
1566     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
1567                         NULL, NULL, (void *)v, errp);
1568 }
1569
1570 typedef struct {
1571     Object *target_obj;
1572     const char *target_name;
1573 } AliasProperty;
1574
1575 static void property_get_alias(Object *obj, struct Visitor *v, void *opaque,
1576                                const char *name, Error **errp)
1577 {
1578     AliasProperty *prop = opaque;
1579
1580     object_property_get(prop->target_obj, v, prop->target_name, errp);
1581 }
1582
1583 static void property_set_alias(Object *obj, struct Visitor *v, void *opaque,
1584                                const char *name, Error **errp)
1585 {
1586     AliasProperty *prop = opaque;
1587
1588     object_property_set(prop->target_obj, v, prop->target_name, errp);
1589 }
1590
1591 static Object *property_resolve_alias(Object *obj, void *opaque,
1592                                       const gchar *part)
1593 {
1594     AliasProperty *prop = opaque;
1595
1596     return object_resolve_path_component(prop->target_obj, prop->target_name);
1597 }
1598
1599 static void property_release_alias(Object *obj, const char *name, void *opaque)
1600 {
1601     AliasProperty *prop = opaque;
1602
1603     g_free(prop);
1604 }
1605
1606 void object_property_add_alias(Object *obj, const char *name,
1607                                Object *target_obj, const char *target_name,
1608                                Error **errp)
1609 {
1610     AliasProperty *prop;
1611     ObjectProperty *op;
1612     ObjectProperty *target_prop;
1613     gchar *prop_type;
1614
1615     target_prop = object_property_find(target_obj, target_name, errp);
1616     if (!target_prop) {
1617         return;
1618     }
1619
1620     if (object_property_is_child(target_prop)) {
1621         prop_type = g_strdup_printf("link%s",
1622                                     target_prop->type + strlen("child"));
1623     } else {
1624         prop_type = g_strdup(target_prop->type);
1625     }
1626
1627     prop = g_malloc(sizeof(*prop));
1628     prop->target_obj = target_obj;
1629     prop->target_name = target_name;
1630
1631     op = object_property_add(obj, name, prop_type,
1632                              property_get_alias,
1633                              property_set_alias,
1634                              property_release_alias,
1635                              prop, errp);
1636     op->resolve = property_resolve_alias;
1637
1638     g_free(prop_type);
1639 }
1640
1641 static void object_instance_init(Object *obj)
1642 {
1643     object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
1644 }
1645
1646 static void register_types(void)
1647 {
1648     static TypeInfo interface_info = {
1649         .name = TYPE_INTERFACE,
1650         .class_size = sizeof(InterfaceClass),
1651         .abstract = true,
1652     };
1653
1654     static TypeInfo object_info = {
1655         .name = TYPE_OBJECT,
1656         .instance_size = sizeof(Object),
1657         .instance_init = object_instance_init,
1658         .abstract = true,
1659     };
1660
1661     type_interface = type_register_internal(&interface_info);
1662     type_register_internal(&object_info);
1663 }
1664
1665 type_init(register_types)