qom/object.c

   1 /*
   2  * QEMU Object Model
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <[email protected]>
   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 "qemu/osdep.h"
  14 #include "qapi/error.h"
  15 #include "qom/object.h"
  16 #include "qom/object_interfaces.h"
  17 #include "qemu/cutils.h"
  18 #include "qapi/visitor.h"
  19 #include "qapi/string-input-visitor.h"
  20 #include "qapi/string-output-visitor.h"
  21 #include "qapi/qapi-builtin-visit.h"
  22 #include "qapi/qmp/qerror.h"
  23 #include "trace.h"
  24
  25 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  26  * of the QOM core on QObject?  */
  27 #include "qom/qom-qobject.h"
  28 #include "qapi/qmp/qbool.h"
  29 #include "qapi/qmp/qnum.h"
  30 #include "qapi/qmp/qstring.h"
  31
  32 #define MAX_INTERFACES 32
  33
  34 typedef struct InterfaceImpl InterfaceImpl;
  35 typedef struct TypeImpl TypeImpl;
  36
  37 struct InterfaceImpl
  38 {
  39     const char *typename;
  40 };
  41
  42 struct TypeImpl
  43 {
  44     const char *name;
  45
  46     size_t class_size;
  47
  48     size_t instance_size;
  49
  50     void (*class_init)(ObjectClass *klass, void *data);
  51     void (*class_base_init)(ObjectClass *klass, void *data);
  52
  53     void *class_data;
  54
  55     void (*instance_init)(Object *obj);
  56     void (*instance_post_init)(Object *obj);
  57     void (*instance_finalize)(Object *obj);
  58
  59     bool abstract;
  60
  61     const char *parent;
  62     TypeImpl *parent_type;
  63
  64     ObjectClass *class;
  65
  66     int num_interfaces;
  67     InterfaceImpl interfaces[MAX_INTERFACES];
  68 };
  69
  70 static Type type_interface;
  71
  72 static GHashTable *type_table_get(void)
  73 {
  74     static GHashTable *type_table;
  75
  76     if (type_table == NULL) {
  77         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  78     }
  79
  80     return type_table;
  81 }
  82
  83 static bool enumerating_types;
  84
  85 static void type_table_add(TypeImpl *ti)
  86 {
  87     assert(!enumerating_types);
  88     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  89 }
  90
  91 static TypeImpl *type_table_lookup(const char *name)
  92 {
  93     return g_hash_table_lookup(type_table_get(), name);
  94 }
  95
  96 static TypeImpl *type_new(const TypeInfo *info)
  97 {
  98     TypeImpl *ti = g_malloc0(sizeof(*ti));
  99     int i;
 100
 101     g_assert(info->name != NULL);
 102
 103     if (type_table_lookup(info->name) != NULL) {
 104         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 105         abort();
 106     }
 107
 108     ti->name = g_strdup(info->name);
 109     ti->parent = g_strdup(info->parent);
 110
 111     ti->class_size = info->class_size;
 112     ti->instance_size = info->instance_size;
 113
 114     ti->class_init = info->class_init;
 115     ti->class_base_init = info->class_base_init;
 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 void type_register_static_array(const TypeInfo *infos, int nr_infos)
 153 {
 154     int i;
 155
 156     for (i = 0; i < nr_infos; i++) {
 157         type_register_static(&infos[i]);
 158     }
 159 }
 160
 161 static TypeImpl *type_get_by_name(const char *name)
 162 {
 163     if (name == NULL) {
 164         return NULL;
 165     }
 166
 167     return type_table_lookup(name);
 168 }
 169
 170 static TypeImpl *type_get_parent(TypeImpl *type)
 171 {
 172     if (!type->parent_type && type->parent) {
 173         type->parent_type = type_get_by_name(type->parent);
 174         g_assert(type->parent_type != NULL);
 175     }
 176
 177     return type->parent_type;
 178 }
 179
 180 static bool type_has_parent(TypeImpl *type)
 181 {
 182     return (type->parent != NULL);
 183 }
 184
 185 static size_t type_class_get_size(TypeImpl *ti)
 186 {
 187     if (ti->class_size) {
 188         return ti->class_size;
 189     }
 190
 191     if (type_has_parent(ti)) {
 192         return type_class_get_size(type_get_parent(ti));
 193     }
 194
 195     return sizeof(ObjectClass);
 196 }
 197
 198 static size_t type_object_get_size(TypeImpl *ti)
 199 {
 200     if (ti->instance_size) {
 201         return ti->instance_size;
 202     }
 203
 204     if (type_has_parent(ti)) {
 205         return type_object_get_size(type_get_parent(ti));
 206     }
 207
 208     return 0;
 209 }
 210
 211 size_t object_type_get_instance_size(const char *typename)
 212 {
 213     TypeImpl *type = type_get_by_name(typename);
 214
 215     g_assert(type != NULL);
 216     return type_object_get_size(type);
 217 }
 218
 219 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 220 {
 221     assert(target_type);
 222
 223     /* Check if target_type is a direct ancestor of type */
 224     while (type) {
 225         if (type == target_type) {
 226             return true;
 227         }
 228
 229         type = type_get_parent(type);
 230     }
 231
 232     return false;
 233 }
 234
 235 static void type_initialize(TypeImpl *ti);
 236
 237 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 238                                       TypeImpl *parent_type)
 239 {
 240     InterfaceClass *new_iface;
 241     TypeInfo info = { };
 242     TypeImpl *iface_impl;
 243
 244     info.parent = parent_type->name;
 245     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 246     info.abstract = true;
 247
 248     iface_impl = type_new(&info);
 249     iface_impl->parent_type = parent_type;
 250     type_initialize(iface_impl);
 251     g_free((char *)info.name);
 252
 253     new_iface = (InterfaceClass *)iface_impl->class;
 254     new_iface->concrete_class = ti->class;
 255     new_iface->interface_type = interface_type;
 256
 257     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 258                                            iface_impl->class);
 259 }
 260
 261 static void object_property_free(gpointer data)
 262 {
 263     ObjectProperty *prop = data;
 264
 265     g_free(prop->name);
 266     g_free(prop->type);
 267     g_free(prop->description);
 268     g_free(prop);
 269 }
 270
 271 static void type_initialize(TypeImpl *ti)
 272 {
 273     TypeImpl *parent;
 274
 275     if (ti->class) {
 276         return;
 277     }
 278
 279     ti->class_size = type_class_get_size(ti);
 280     ti->instance_size = type_object_get_size(ti);
 281     /* Any type with zero instance_size is implicitly abstract.
 282      * This means interface types are all abstract.
 283      */
 284     if (ti->instance_size == 0) {
 285         ti->abstract = true;
 286     }
 287     if (type_is_ancestor(ti, type_interface)) {
 288         assert(ti->instance_size == 0);
 289         assert(ti->abstract);
 290         assert(!ti->instance_init);
 291         assert(!ti->instance_post_init);
 292         assert(!ti->instance_finalize);
 293         assert(!ti->num_interfaces);
 294     }
 295     ti->class = g_malloc0(ti->class_size);
 296
 297     parent = type_get_parent(ti);
 298     if (parent) {
 299         type_initialize(parent);
 300         GSList *e;
 301         int i;
 302
 303         g_assert(parent->class_size <= ti->class_size);
 304         memcpy(ti->class, parent->class, parent->class_size);
 305         ti->class->interfaces = NULL;
 306         ti->class->properties = g_hash_table_new_full(
 307             g_str_hash, g_str_equal, g_free, object_property_free);
 308
 309         for (e = parent->class->interfaces; e; e = e->next) {
 310             InterfaceClass *iface = e->data;
 311             ObjectClass *klass = OBJECT_CLASS(iface);
 312
 313             type_initialize_interface(ti, iface->interface_type, klass->type);
 314         }
 315
 316         for (i = 0; i < ti->num_interfaces; i++) {
 317             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 318             for (e = ti->class->interfaces; e; e = e->next) {
 319                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 320
 321                 if (type_is_ancestor(target_type, t)) {
 322                     break;
 323                 }
 324             }
 325
 326             if (e) {
 327                 continue;
 328             }
 329
 330             type_initialize_interface(ti, t, t);
 331         }
 332     } else {
 333         ti->class->properties = g_hash_table_new_full(
 334             g_str_hash, g_str_equal, g_free, object_property_free);
 335     }
 336
 337     ti->class->type = ti;
 338
 339     while (parent) {
 340         if (parent->class_base_init) {
 341             parent->class_base_init(ti->class, ti->class_data);
 342         }
 343         parent = type_get_parent(parent);
 344     }
 345
 346     if (ti->class_init) {
 347         ti->class_init(ti->class, ti->class_data);
 348     }
 349 }
 350
 351 static void object_init_with_type(Object *obj, TypeImpl *ti)
 352 {
 353     if (type_has_parent(ti)) {
 354         object_init_with_type(obj, type_get_parent(ti));
 355     }
 356
 357     if (ti->instance_init) {
 358         ti->instance_init(obj);
 359     }
 360 }
 361
 362 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 363 {
 364     if (ti->instance_post_init) {
 365         ti->instance_post_init(obj);
 366     }
 367
 368     if (type_has_parent(ti)) {
 369         object_post_init_with_type(obj, type_get_parent(ti));
 370     }
 371 }
 372
 373 void object_apply_global_props(Object *obj, const GPtrArray *props, Error **errp)
 374 {
 375     int i;
 376
 377     if (!props) {
 378         return;
 379     }
 380
 381     for (i = 0; i < props->len; i++) {
 382         GlobalProperty *p = g_ptr_array_index(props, i);
 383         Error *err = NULL;
 384
 385         if (object_dynamic_cast(obj, p->driver) == NULL) {
 386             continue;
 387         }
 388         p->used = true;
 389         object_property_parse(obj, p->value, p->property, &err);
 390         if (err != NULL) {
 391             error_prepend(&err, "can't apply global %s.%s=%s: ",
 392                           p->driver, p->property, p->value);
 393             /*
 394              * If errp != NULL, propagate error and return.
 395              * If errp == NULL, report a warning, but keep going
 396              * with the remaining globals.
 397              */
 398             if (errp) {
 399                 error_propagate(errp, err);
 400                 return;
 401             } else {
 402                 warn_report_err(err);
 403             }
 404         }
 405     }
 406 }
 407
 408 static void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 409 {
 410     Object *obj = data;
 411
 412     g_assert(type != NULL);
 413     type_initialize(type);
 414
 415     g_assert(type->instance_size >= sizeof(Object));
 416     g_assert(type->abstract == false);
 417     g_assert(size >= type->instance_size);
 418
 419     memset(obj, 0, type->instance_size);
 420     obj->class = type->class;
 421     object_ref(obj);
 422     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 423                                             NULL, object_property_free);
 424     object_init_with_type(obj, type);
 425     object_post_init_with_type(obj, type);
 426 }
 427
 428 void object_initialize(void *data, size_t size, const char *typename)
 429 {
 430     TypeImpl *type = type_get_by_name(typename);
 431
 432     object_initialize_with_type(data, size, type);
 433 }
 434
 435 void object_initialize_child(Object *parentobj, const char *propname,
 436                              void *childobj, size_t size, const char *type,
 437                              Error **errp, ...)
 438 {
 439     va_list vargs;
 440
 441     va_start(vargs, errp);
 442     object_initialize_childv(parentobj, propname, childobj, size, type, errp,
 443                              vargs);
 444     va_end(vargs);
 445 }
 446
 447 void object_initialize_childv(Object *parentobj, const char *propname,
 448                               void *childobj, size_t size, const char *type,
 449                               Error **errp, va_list vargs)
 450 {
 451     Error *local_err = NULL;
 452     Object *obj;
 453     UserCreatable *uc;
 454
 455     object_initialize(childobj, size, type);
 456     obj = OBJECT(childobj);
 457
 458     object_set_propv(obj, &local_err, vargs);
 459     if (local_err) {
 460         goto out;
 461     }
 462
 463     object_property_add_child(parentobj, propname, obj, &local_err);
 464     if (local_err) {
 465         goto out;
 466     }
 467
 468     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 469     if (uc) {
 470         user_creatable_complete(uc, &local_err);
 471         if (local_err) {
 472             object_unparent(obj);
 473             goto out;
 474         }
 475     }
 476
 477     /*
 478      * Since object_property_add_child added a reference to the child object,
 479      * we can drop the reference added by object_initialize(), so the child
 480      * property will own the only reference to the object.
 481      */
 482     object_unref(obj);
 483
 484 out:
 485     if (local_err) {
 486         error_propagate(errp, local_err);
 487         object_unref(obj);
 488     }
 489 }
 490
 491 static inline bool object_property_is_child(ObjectProperty *prop)
 492 {
 493     return strstart(prop->type, "child<", NULL);
 494 }
 495
 496 static void object_property_del_all(Object *obj)
 497 {
 498     ObjectProperty *prop;
 499     GHashTableIter iter;
 500     gpointer key, value;
 501     bool released;
 502
 503     do {
 504         released = false;
 505         g_hash_table_iter_init(&iter, obj->properties);
 506         while (g_hash_table_iter_next(&iter, &key, &value)) {
 507             prop = value;
 508             if (prop->release) {
 509                 prop->release(obj, prop->name, prop->opaque);
 510                 prop->release = NULL;
 511                 released = true;
 512                 break;
 513             }
 514             g_hash_table_iter_remove(&iter);
 515         }
 516     } while (released);
 517
 518     g_hash_table_unref(obj->properties);
 519 }
 520
 521 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 522 {
 523     ObjectProperty *prop;
 524     GHashTableIter iter;
 525     gpointer key, value;
 526
 527     g_hash_table_iter_init(&iter, obj->properties);
 528     while (g_hash_table_iter_next(&iter, &key, &value)) {
 529         prop = value;
 530         if (object_property_is_child(prop) && prop->opaque == child) {
 531             if (prop->release) {
 532                 prop->release(obj, prop->name, prop->opaque);
 533                 prop->release = NULL;
 534             }
 535             break;
 536         }
 537     }
 538     g_hash_table_iter_init(&iter, obj->properties);
 539     while (g_hash_table_iter_next(&iter, &key, &value)) {
 540         prop = value;
 541         if (object_property_is_child(prop) && prop->opaque == child) {
 542             g_hash_table_iter_remove(&iter);
 543             break;
 544         }
 545     }
 546 }
 547
 548 void object_unparent(Object *obj)
 549 {
 550     if (obj->parent) {
 551         object_property_del_child(obj->parent, obj, NULL);
 552     }
 553 }
 554
 555 static void object_deinit(Object *obj, TypeImpl *type)
 556 {
 557     if (type->instance_finalize) {
 558         type->instance_finalize(obj);
 559     }
 560
 561     if (type_has_parent(type)) {
 562         object_deinit(obj, type_get_parent(type));
 563     }
 564 }
 565
 566 static void object_finalize(void *data)
 567 {
 568     Object *obj = data;
 569     TypeImpl *ti = obj->class->type;
 570
 571     object_property_del_all(obj);
 572     object_deinit(obj, ti);
 573
 574     g_assert(obj->ref == 0);
 575     if (obj->free) {
 576         obj->free(obj);
 577     }
 578 }
 579
 580 static Object *object_new_with_type(Type type)
 581 {
 582     Object *obj;
 583
 584     g_assert(type != NULL);
 585     type_initialize(type);
 586
 587     obj = g_malloc(type->instance_size);
 588     object_initialize_with_type(obj, type->instance_size, type);
 589     obj->free = g_free;
 590
 591     return obj;
 592 }
 593
 594 Object *object_new(const char *typename)
 595 {
 596     TypeImpl *ti = type_get_by_name(typename);
 597
 598     return object_new_with_type(ti);
 599 }
 600
 601
 602 Object *object_new_with_props(const char *typename,
 603                               Object *parent,
 604                               const char *id,
 605                               Error **errp,
 606                               ...)
 607 {
 608     va_list vargs;
 609     Object *obj;
 610
 611     va_start(vargs, errp);
 612     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 613     va_end(vargs);
 614
 615     return obj;
 616 }
 617
 618
 619 Object *object_new_with_propv(const char *typename,
 620                               Object *parent,
 621                               const char *id,
 622                               Error **errp,
 623                               va_list vargs)
 624 {
 625     Object *obj;
 626     ObjectClass *klass;
 627     Error *local_err = NULL;
 628     UserCreatable *uc;
 629
 630     klass = object_class_by_name(typename);
 631     if (!klass) {
 632         error_setg(errp, "invalid object type: %s", typename);
 633         return NULL;
 634     }
 635
 636     if (object_class_is_abstract(klass)) {
 637         error_setg(errp, "object type '%s' is abstract", typename);
 638         return NULL;
 639     }
 640     obj = object_new(typename);
 641
 642     if (object_set_propv(obj, &local_err, vargs) < 0) {
 643         goto error;
 644     }
 645
 646     object_property_add_child(parent, id, obj, &local_err);
 647     if (local_err) {
 648         goto error;
 649     }
 650
 651     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 652     if (uc) {
 653         user_creatable_complete(uc, &local_err);
 654         if (local_err) {
 655             object_unparent(obj);
 656             goto error;
 657         }
 658     }
 659
 660     object_unref(OBJECT(obj));
 661     return obj;
 662
 663  error:
 664     error_propagate(errp, local_err);
 665     object_unref(obj);
 666     return NULL;
 667 }
 668
 669
 670 int object_set_props(Object *obj,
 671                      Error **errp,
 672                      ...)
 673 {
 674     va_list vargs;
 675     int ret;
 676
 677     va_start(vargs, errp);
 678     ret = object_set_propv(obj, errp, vargs);
 679     va_end(vargs);
 680
 681     return ret;
 682 }
 683
 684
 685 int object_set_propv(Object *obj,
 686                      Error **errp,
 687                      va_list vargs)
 688 {
 689     const char *propname;
 690     Error *local_err = NULL;
 691
 692     propname = va_arg(vargs, char *);
 693     while (propname != NULL) {
 694         const char *value = va_arg(vargs, char *);
 695
 696         g_assert(value != NULL);
 697         object_property_parse(obj, value, propname, &local_err);
 698         if (local_err) {
 699             error_propagate(errp, local_err);
 700             return -1;
 701         }
 702         propname = va_arg(vargs, char *);
 703     }
 704
 705     return 0;
 706 }
 707
 708
 709 Object *object_dynamic_cast(Object *obj, const char *typename)
 710 {
 711     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 712         return obj;
 713     }
 714
 715     return NULL;
 716 }
 717
 718 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 719                                    const char *file, int line, const char *func)
 720 {
 721     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 722                                      typename, file, line, func);
 723
 724 #ifdef CONFIG_QOM_CAST_DEBUG
 725     int i;
 726     Object *inst;
 727
 728     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 729         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 730             goto out;
 731         }
 732     }
 733
 734     inst = object_dynamic_cast(obj, typename);
 735
 736     if (!inst && obj) {
 737         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 738                 file, line, func, obj, typename);
 739         abort();
 740     }
 741
 742     assert(obj == inst);
 743
 744     if (obj && obj == inst) {
 745         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 746             atomic_set(&obj->class->object_cast_cache[i - 1],
 747                        atomic_read(&obj->class->object_cast_cache[i]));
 748         }
 749         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 750     }
 751
 752 out:
 753 #endif
 754     return obj;
 755 }
 756
 757 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 758                                        const char *typename)
 759 {
 760     ObjectClass *ret = NULL;
 761     TypeImpl *target_type;
 762     TypeImpl *type;
 763
 764     if (!class) {
 765         return NULL;
 766     }
 767
 768     /* A simple fast path that can trigger a lot for leaf classes.  */
 769     type = class->type;
 770     if (type->name == typename) {
 771         return class;
 772     }
 773
 774     target_type = type_get_by_name(typename);
 775     if (!target_type) {
 776         /* target class type unknown, so fail the cast */
 777         return NULL;
 778     }
 779
 780     if (type->class->interfaces &&
 781             type_is_ancestor(target_type, type_interface)) {
 782         int found = 0;
 783         GSList *i;
 784
 785         for (i = class->interfaces; i; i = i->next) {
 786             ObjectClass *target_class = i->data;
 787
 788             if (type_is_ancestor(target_class->type, target_type)) {
 789                 ret = target_class;
 790                 found++;
 791             }
 792          }
 793
 794         /* The match was ambiguous, don't allow a cast */
 795         if (found > 1) {
 796             ret = NULL;
 797         }
 798     } else if (type_is_ancestor(type, target_type)) {
 799         ret = class;
 800     }
 801
 802     return ret;
 803 }
 804
 805 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 806                                               const char *typename,
 807                                               const char *file, int line,
 808                                               const char *func)
 809 {
 810     ObjectClass *ret;
 811
 812     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 813                                            typename, file, line, func);
 814
 815 #ifdef CONFIG_QOM_CAST_DEBUG
 816     int i;
 817
 818     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 819         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 820             ret = class;
 821             goto out;
 822         }
 823     }
 824 #else
 825     if (!class || !class->interfaces) {
 826         return class;
 827     }
 828 #endif
 829
 830     ret = object_class_dynamic_cast(class, typename);
 831     if (!ret && class) {
 832         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 833                 file, line, func, class, typename);
 834         abort();
 835     }
 836
 837 #ifdef CONFIG_QOM_CAST_DEBUG
 838     if (class && ret == class) {
 839         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 840             atomic_set(&class->class_cast_cache[i - 1],
 841                        atomic_read(&class->class_cast_cache[i]));
 842         }
 843         atomic_set(&class->class_cast_cache[i - 1], typename);
 844     }
 845 out:
 846 #endif
 847     return ret;
 848 }
 849
 850 const char *object_get_typename(const Object *obj)
 851 {
 852     return obj->class->type->name;
 853 }
 854
 855 ObjectClass *object_get_class(Object *obj)
 856 {
 857     return obj->class;
 858 }
 859
 860 bool object_class_is_abstract(ObjectClass *klass)
 861 {
 862     return klass->type->abstract;
 863 }
 864
 865 const char *object_class_get_name(ObjectClass *klass)
 866 {
 867     return klass->type->name;
 868 }
 869
 870 ObjectClass *object_class_by_name(const char *typename)
 871 {
 872     TypeImpl *type = type_get_by_name(typename);
 873
 874     if (!type) {
 875         return NULL;
 876     }
 877
 878     type_initialize(type);
 879
 880     return type->class;
 881 }
 882
 883 ObjectClass *object_class_get_parent(ObjectClass *class)
 884 {
 885     TypeImpl *type = type_get_parent(class->type);
 886
 887     if (!type) {
 888         return NULL;
 889     }
 890
 891     type_initialize(type);
 892
 893     return type->class;
 894 }
 895
 896 typedef struct OCFData
 897 {
 898     void (*fn)(ObjectClass *klass, void *opaque);
 899     const char *implements_type;
 900     bool include_abstract;
 901     void *opaque;
 902 } OCFData;
 903
 904 static void object_class_foreach_tramp(gpointer key, gpointer value,
 905                                        gpointer opaque)
 906 {
 907     OCFData *data = opaque;
 908     TypeImpl *type = value;
 909     ObjectClass *k;
 910
 911     type_initialize(type);
 912     k = type->class;
 913
 914     if (!data->include_abstract && type->abstract) {
 915         return;
 916     }
 917
 918     if (data->implements_type &&
 919         !object_class_dynamic_cast(k, data->implements_type)) {
 920         return;
 921     }
 922
 923     data->fn(k, data->opaque);
 924 }
 925
 926 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 927                           const char *implements_type, bool include_abstract,
 928                           void *opaque)
 929 {
 930     OCFData data = { fn, implements_type, include_abstract, opaque };
 931
 932     enumerating_types = true;
 933     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 934     enumerating_types = false;
 935 }
 936
 937 static int do_object_child_foreach(Object *obj,
 938                                    int (*fn)(Object *child, void *opaque),
 939                                    void *opaque, bool recurse)
 940 {
 941     GHashTableIter iter;
 942     ObjectProperty *prop;
 943     int ret = 0;
 944
 945     g_hash_table_iter_init(&iter, obj->properties);
 946     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
 947         if (object_property_is_child(prop)) {
 948             Object *child = prop->opaque;
 949
 950             ret = fn(child, opaque);
 951             if (ret != 0) {
 952                 break;
 953             }
 954             if (recurse) {
 955                 do_object_child_foreach(child, fn, opaque, true);
 956             }
 957         }
 958     }
 959     return ret;
 960 }
 961
 962 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 963                          void *opaque)
 964 {
 965     return do_object_child_foreach(obj, fn, opaque, false);
 966 }
 967
 968 int object_child_foreach_recursive(Object *obj,
 969                                    int (*fn)(Object *child, void *opaque),
 970                                    void *opaque)
 971 {
 972     return do_object_child_foreach(obj, fn, opaque, true);
 973 }
 974
 975 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 976 {
 977     GSList **list = opaque;
 978
 979     *list = g_slist_prepend(*list, klass);
 980 }
 981
 982 GSList *object_class_get_list(const char *implements_type,
 983                               bool include_abstract)
 984 {
 985     GSList *list = NULL;
 986
 987     object_class_foreach(object_class_get_list_tramp,
 988                          implements_type, include_abstract, &list);
 989     return list;
 990 }
 991
 992 static gint object_class_cmp(gconstpointer a, gconstpointer b)
 993 {
 994     return strcasecmp(object_class_get_name((ObjectClass *)a),
 995                       object_class_get_name((ObjectClass *)b));
 996 }
 997
 998 GSList *object_class_get_list_sorted(const char *implements_type,
 999                                      bool include_abstract)
1000 {
1001     return g_slist_sort(object_class_get_list(implements_type, include_abstract),
1002                         object_class_cmp);
1003 }
1004
1005 void object_ref(Object *obj)
1006 {
1007     if (!obj) {
1008         return;
1009     }
1010     atomic_inc(&obj->ref);
1011 }
1012
1013 void object_unref(Object *obj)
1014 {
1015     if (!obj) {
1016         return;
1017     }
1018     g_assert(obj->ref > 0);
1019
1020     /* parent always holds a reference to its children */
1021     if (atomic_fetch_dec(&obj->ref) == 1) {
1022         object_finalize(obj);
1023     }
1024 }
1025
1026 ObjectProperty *
1027 object_property_add(Object *obj, const char *name, const char *type,
1028                     ObjectPropertyAccessor *get,
1029                     ObjectPropertyAccessor *set,
1030                     ObjectPropertyRelease *release,
1031                     void *opaque, Error **errp)
1032 {
1033     ObjectProperty *prop;
1034     size_t name_len = strlen(name);
1035
1036     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
1037         int i;
1038         ObjectProperty *ret;
1039         char *name_no_array = g_strdup(name);
1040
1041         name_no_array[name_len - 3] = '\0';
1042         for (i = 0; ; ++i) {
1043             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
1044
1045             ret = object_property_add(obj, full_name, type, get, set,
1046                                       release, opaque, NULL);
1047             g_free(full_name);
1048             if (ret) {
1049                 break;
1050             }
1051         }
1052         g_free(name_no_array);
1053         return ret;
1054     }
1055
1056     if (object_property_find(obj, name, NULL) != NULL) {
1057         error_setg(errp, "attempt to add duplicate property '%s'"
1058                    " to object (type '%s')", name,
1059                    object_get_typename(obj));
1060         return NULL;
1061     }
1062
1063     prop = g_malloc0(sizeof(*prop));
1064
1065     prop->name = g_strdup(name);
1066     prop->type = g_strdup(type);
1067
1068     prop->get = get;
1069     prop->set = set;
1070     prop->release = release;
1071     prop->opaque = opaque;
1072
1073     g_hash_table_insert(obj->properties, prop->name, prop);
1074     return prop;
1075 }
1076
1077 ObjectProperty *
1078 object_class_property_add(ObjectClass *klass,
1079                           const char *name,
1080                           const char *type,
1081                           ObjectPropertyAccessor *get,
1082                           ObjectPropertyAccessor *set,
1083                           ObjectPropertyRelease *release,
1084                           void *opaque,
1085                           Error **errp)
1086 {
1087     ObjectProperty *prop;
1088
1089     if (object_class_property_find(klass, name, NULL) != NULL) {
1090         error_setg(errp, "attempt to add duplicate property '%s'"
1091                    " to object (type '%s')", name,
1092                    object_class_get_name(klass));
1093         return NULL;
1094     }
1095
1096     prop = g_malloc0(sizeof(*prop));
1097
1098     prop->name = g_strdup(name);
1099     prop->type = g_strdup(type);
1100
1101     prop->get = get;
1102     prop->set = set;
1103     prop->release = release;
1104     prop->opaque = opaque;
1105
1106     g_hash_table_insert(klass->properties, g_strdup(name), prop);
1107
1108     return prop;
1109 }
1110
1111 ObjectProperty *object_property_find(Object *obj, const char *name,
1112                                      Error **errp)
1113 {
1114     ObjectProperty *prop;
1115     ObjectClass *klass = object_get_class(obj);
1116
1117     prop = object_class_property_find(klass, name, NULL);
1118     if (prop) {
1119         return prop;
1120     }
1121
1122     prop = g_hash_table_lookup(obj->properties, name);
1123     if (prop) {
1124         return prop;
1125     }
1126
1127     error_setg(errp, "Property '.%s' not found", name);
1128     return NULL;
1129 }
1130
1131 void object_property_iter_init(ObjectPropertyIterator *iter,
1132                                Object *obj)
1133 {
1134     g_hash_table_iter_init(&iter->iter, obj->properties);
1135     iter->nextclass = object_get_class(obj);
1136 }
1137
1138 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1139 {
1140     gpointer key, val;
1141     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1142         if (!iter->nextclass) {
1143             return NULL;
1144         }
1145         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1146         iter->nextclass = object_class_get_parent(iter->nextclass);
1147     }
1148     return val;
1149 }
1150
1151 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1152                                      ObjectClass *klass)
1153 {
1154     g_hash_table_iter_init(&iter->iter, klass->properties);
1155     iter->nextclass = object_class_get_parent(klass);
1156 }
1157
1158 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1159                                            Error **errp)
1160 {
1161     ObjectProperty *prop;
1162     ObjectClass *parent_klass;
1163
1164     parent_klass = object_class_get_parent(klass);
1165     if (parent_klass) {
1166         prop = object_class_property_find(parent_klass, name, NULL);
1167         if (prop) {
1168             return prop;
1169         }
1170     }
1171
1172     prop = g_hash_table_lookup(klass->properties, name);
1173     if (!prop) {
1174         error_setg(errp, "Property '.%s' not found", name);
1175     }
1176     return prop;
1177 }
1178
1179 void object_property_del(Object *obj, const char *name, Error **errp)
1180 {
1181     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1182
1183     if (!prop) {
1184         error_setg(errp, "Property '.%s' not found", name);
1185         return;
1186     }
1187
1188     if (prop->release) {
1189         prop->release(obj, name, prop->opaque);
1190     }
1191     g_hash_table_remove(obj->properties, name);
1192 }
1193
1194 void object_property_get(Object *obj, Visitor *v, const char *name,
1195                          Error **errp)
1196 {
1197     ObjectProperty *prop = object_property_find(obj, name, errp);
1198     if (prop == NULL) {
1199         return;
1200     }
1201
1202     if (!prop->get) {
1203         error_setg(errp, QERR_PERMISSION_DENIED);
1204     } else {
1205         prop->get(obj, v, name, prop->opaque, errp);
1206     }
1207 }
1208
1209 void object_property_set(Object *obj, Visitor *v, const char *name,
1210                          Error **errp)
1211 {
1212     ObjectProperty *prop = object_property_find(obj, name, errp);
1213     if (prop == NULL) {
1214         return;
1215     }
1216
1217     if (!prop->set) {
1218         error_setg(errp, QERR_PERMISSION_DENIED);
1219     } else {
1220         prop->set(obj, v, name, prop->opaque, errp);
1221     }
1222 }
1223
1224 void object_property_set_str(Object *obj, const char *value,
1225                              const char *name, Error **errp)
1226 {
1227     QString *qstr = qstring_from_str(value);
1228     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1229
1230     qobject_unref(qstr);
1231 }
1232
1233 char *object_property_get_str(Object *obj, const char *name,
1234                               Error **errp)
1235 {
1236     QObject *ret = object_property_get_qobject(obj, name, errp);
1237     char *retval;
1238
1239     if (!ret) {
1240         return NULL;
1241     }
1242
1243     retval = g_strdup(qobject_get_try_str(ret));
1244     if (!retval) {
1245         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1246     }
1247
1248     qobject_unref(ret);
1249     return retval;
1250 }
1251
1252 void object_property_set_link(Object *obj, Object *value,
1253                               const char *name, Error **errp)
1254 {
1255     if (value) {
1256         gchar *path = object_get_canonical_path(value);
1257         object_property_set_str(obj, path, name, errp);
1258         g_free(path);
1259     } else {
1260         object_property_set_str(obj, "", name, errp);
1261     }
1262 }
1263
1264 Object *object_property_get_link(Object *obj, const char *name,
1265                                  Error **errp)
1266 {
1267     char *str = object_property_get_str(obj, name, errp);
1268     Object *target = NULL;
1269
1270     if (str && *str) {
1271         target = object_resolve_path(str, NULL);
1272         if (!target) {
1273             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1274                       "Device '%s' not found", str);
1275         }
1276     }
1277
1278     g_free(str);
1279     return target;
1280 }
1281
1282 void object_property_set_bool(Object *obj, bool value,
1283                               const char *name, Error **errp)
1284 {
1285     QBool *qbool = qbool_from_bool(value);
1286     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1287
1288     qobject_unref(qbool);
1289 }
1290
1291 bool object_property_get_bool(Object *obj, const char *name,
1292                               Error **errp)
1293 {
1294     QObject *ret = object_property_get_qobject(obj, name, errp);
1295     QBool *qbool;
1296     bool retval;
1297
1298     if (!ret) {
1299         return false;
1300     }
1301     qbool = qobject_to(QBool, ret);
1302     if (!qbool) {
1303         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1304         retval = false;
1305     } else {
1306         retval = qbool_get_bool(qbool);
1307     }
1308
1309     qobject_unref(ret);
1310     return retval;
1311 }
1312
1313 void object_property_set_int(Object *obj, int64_t value,
1314                              const char *name, Error **errp)
1315 {
1316     QNum *qnum = qnum_from_int(value);
1317     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1318
1319     qobject_unref(qnum);
1320 }
1321
1322 int64_t object_property_get_int(Object *obj, const char *name,
1323                                 Error **errp)
1324 {
1325     QObject *ret = object_property_get_qobject(obj, name, errp);
1326     QNum *qnum;
1327     int64_t retval;
1328
1329     if (!ret) {
1330         return -1;
1331     }
1332
1333     qnum = qobject_to(QNum, ret);
1334     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1335         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1336         retval = -1;
1337     }
1338
1339     qobject_unref(ret);
1340     return retval;
1341 }
1342
1343 void object_property_set_uint(Object *obj, uint64_t value,
1344                               const char *name, Error **errp)
1345 {
1346     QNum *qnum = qnum_from_uint(value);
1347
1348     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1349     qobject_unref(qnum);
1350 }
1351
1352 uint64_t object_property_get_uint(Object *obj, const char *name,
1353                                   Error **errp)
1354 {
1355     QObject *ret = object_property_get_qobject(obj, name, errp);
1356     QNum *qnum;
1357     uint64_t retval;
1358
1359     if (!ret) {
1360         return 0;
1361     }
1362     qnum = qobject_to(QNum, ret);
1363     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1364         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1365         retval = 0;
1366     }
1367
1368     qobject_unref(ret);
1369     return retval;
1370 }
1371
1372 typedef struct EnumProperty {
1373     const QEnumLookup *lookup;
1374     int (*get)(Object *, Error **);
1375     void (*set)(Object *, int, Error **);
1376 } EnumProperty;
1377
1378 int object_property_get_enum(Object *obj, const char *name,
1379                              const char *typename, Error **errp)
1380 {
1381     Error *err = NULL;
1382     Visitor *v;
1383     char *str;
1384     int ret;
1385     ObjectProperty *prop = object_property_find(obj, name, errp);
1386     EnumProperty *enumprop;
1387
1388     if (prop == NULL) {
1389         return 0;
1390     }
1391
1392     if (!g_str_equal(prop->type, typename)) {
1393         error_setg(errp, "Property %s on %s is not '%s' enum type",
1394                    name, object_class_get_name(
1395                        object_get_class(obj)), typename);
1396         return 0;
1397     }
1398
1399     enumprop = prop->opaque;
1400
1401     v = string_output_visitor_new(false, &str);
1402     object_property_get(obj, v, name, &err);
1403     if (err) {
1404         error_propagate(errp, err);
1405         visit_free(v);
1406         return 0;
1407     }
1408     visit_complete(v, &str);
1409     visit_free(v);
1410     v = string_input_visitor_new(str);
1411     visit_type_enum(v, name, &ret, enumprop->lookup, errp);
1412
1413     g_free(str);
1414     visit_free(v);
1415
1416     return ret;
1417 }
1418
1419 void object_property_get_uint16List(Object *obj, const char *name,
1420                                     uint16List **list, Error **errp)
1421 {
1422     Error *err = NULL;
1423     Visitor *v;
1424     char *str;
1425
1426     v = string_output_visitor_new(false, &str);
1427     object_property_get(obj, v, name, &err);
1428     if (err) {
1429         error_propagate(errp, err);
1430         goto out;
1431     }
1432     visit_complete(v, &str);
1433     visit_free(v);
1434     v = string_input_visitor_new(str);
1435     visit_type_uint16List(v, NULL, list, errp);
1436
1437     g_free(str);
1438 out:
1439     visit_free(v);
1440 }
1441
1442 void object_property_parse(Object *obj, const char *string,
1443                            const char *name, Error **errp)
1444 {
1445     Visitor *v = string_input_visitor_new(string);
1446     object_property_set(obj, v, name, errp);
1447     visit_free(v);
1448 }
1449
1450 char *object_property_print(Object *obj, const char *name, bool human,
1451                             Error **errp)
1452 {
1453     Visitor *v;
1454     char *string = NULL;
1455     Error *local_err = NULL;
1456
1457     v = string_output_visitor_new(human, &string);
1458     object_property_get(obj, v, name, &local_err);
1459     if (local_err) {
1460         error_propagate(errp, local_err);
1461         goto out;
1462     }
1463
1464     visit_complete(v, &string);
1465
1466 out:
1467     visit_free(v);
1468     return string;
1469 }
1470
1471 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1472 {
1473     ObjectProperty *prop = object_property_find(obj, name, errp);
1474     if (prop == NULL) {
1475         return NULL;
1476     }
1477
1478     return prop->type;
1479 }
1480
1481 Object *object_get_root(void)
1482 {
1483     static Object *root;
1484
1485     if (!root) {
1486         root = object_new("container");
1487     }
1488
1489     return root;
1490 }
1491
1492 Object *object_get_objects_root(void)
1493 {
1494     return container_get(object_get_root(), "/objects");
1495 }
1496
1497 Object *object_get_internal_root(void)
1498 {
1499     static Object *internal_root;
1500
1501     if (!internal_root) {
1502         internal_root = object_new("container");
1503     }
1504
1505     return internal_root;
1506 }
1507
1508 static void object_get_child_property(Object *obj, Visitor *v,
1509                                       const char *name, void *opaque,
1510                                       Error **errp)
1511 {
1512     Object *child = opaque;
1513     gchar *path;
1514
1515     path = object_get_canonical_path(child);
1516     visit_type_str(v, name, &path, errp);
1517     g_free(path);
1518 }
1519
1520 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1521 {
1522     return opaque;
1523 }
1524
1525 static void object_finalize_child_property(Object *obj, const char *name,
1526                                            void *opaque)
1527 {
1528     Object *child = opaque;
1529
1530     if (child->class->unparent) {
1531         (child->class->unparent)(child);
1532     }
1533     child->parent = NULL;
1534     object_unref(child);
1535 }
1536
1537 void object_property_add_child(Object *obj, const char *name,
1538                                Object *child, Error **errp)
1539 {
1540     Error *local_err = NULL;
1541     gchar *type;
1542     ObjectProperty *op;
1543
1544     if (child->parent != NULL) {
1545         error_setg(errp, "child object is already parented");
1546         return;
1547     }
1548
1549     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1550
1551     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1552                              object_finalize_child_property, child, &local_err);
1553     if (local_err) {
1554         error_propagate(errp, local_err);
1555         goto out;
1556     }
1557
1558     op->resolve = object_resolve_child_property;
1559     object_ref(child);
1560     child->parent = obj;
1561
1562 out:
1563     g_free(type);
1564 }
1565
1566 void object_property_allow_set_link(const Object *obj, const char *name,
1567                                     Object *val, Error **errp)
1568 {
1569     /* Allow the link to be set, always */
1570 }
1571
1572 typedef struct {
1573     Object **child;
1574     void (*check)(const Object *, const char *, Object *, Error **);
1575     ObjectPropertyLinkFlags flags;
1576 } LinkProperty;
1577
1578 static void object_get_link_property(Object *obj, Visitor *v,
1579                                      const char *name, void *opaque,
1580                                      Error **errp)
1581 {
1582     LinkProperty *lprop = opaque;
1583     Object **child = lprop->child;
1584     gchar *path;
1585
1586     if (*child) {
1587         path = object_get_canonical_path(*child);
1588         visit_type_str(v, name, &path, errp);
1589         g_free(path);
1590     } else {
1591         path = (gchar *)"";
1592         visit_type_str(v, name, &path, errp);
1593     }
1594 }
1595
1596 /*
1597  * object_resolve_link:
1598  *
1599  * Lookup an object and ensure its type matches the link property type.  This
1600  * is similar to object_resolve_path() except type verification against the
1601  * link property is performed.
1602  *
1603  * Returns: The matched object or NULL on path lookup failures.
1604  */
1605 static Object *object_resolve_link(Object *obj, const char *name,
1606                                    const char *path, Error **errp)
1607 {
1608     const char *type;
1609     gchar *target_type;
1610     bool ambiguous = false;
1611     Object *target;
1612
1613     /* Go from link<FOO> to FOO.  */
1614     type = object_property_get_type(obj, name, NULL);
1615     target_type = g_strndup(&type[5], strlen(type) - 6);
1616     target = object_resolve_path_type(path, target_type, &ambiguous);
1617
1618     if (ambiguous) {
1619         error_setg(errp, "Path '%s' does not uniquely identify an object",
1620                    path);
1621     } else if (!target) {
1622         target = object_resolve_path(path, &ambiguous);
1623         if (target || ambiguous) {
1624             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1625         } else {
1626             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1627                       "Device '%s' not found", path);
1628         }
1629         target = NULL;
1630     }
1631     g_free(target_type);
1632
1633     return target;
1634 }
1635
1636 static void object_set_link_property(Object *obj, Visitor *v,
1637                                      const char *name, void *opaque,
1638                                      Error **errp)
1639 {
1640     Error *local_err = NULL;
1641     LinkProperty *prop = opaque;
1642     Object **child = prop->child;
1643     Object *old_target = *child;
1644     Object *new_target = NULL;
1645     char *path = NULL;
1646
1647     visit_type_str(v, name, &path, &local_err);
1648
1649     if (!local_err && strcmp(path, "") != 0) {
1650         new_target = object_resolve_link(obj, name, path, &local_err);
1651     }
1652
1653     g_free(path);
1654     if (local_err) {
1655         error_propagate(errp, local_err);
1656         return;
1657     }
1658
1659     prop->check(obj, name, new_target, &local_err);
1660     if (local_err) {
1661         error_propagate(errp, local_err);
1662         return;
1663     }
1664
1665     *child = new_target;
1666     if (prop->flags == OBJ_PROP_LINK_STRONG) {
1667         object_ref(new_target);
1668         object_unref(old_target);
1669     }
1670 }
1671
1672 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1673 {
1674     LinkProperty *lprop = opaque;
1675
1676     return *lprop->child;
1677 }
1678
1679 static void object_release_link_property(Object *obj, const char *name,
1680                                          void *opaque)
1681 {
1682     LinkProperty *prop = opaque;
1683
1684     if ((prop->flags & OBJ_PROP_LINK_STRONG) && *prop->child) {
1685         object_unref(*prop->child);
1686     }
1687     g_free(prop);
1688 }
1689
1690 void object_property_add_link(Object *obj, const char *name,
1691                               const char *type, Object **child,
1692                               void (*check)(const Object *, const char *,
1693                                             Object *, Error **),
1694                               ObjectPropertyLinkFlags flags,
1695                               Error **errp)
1696 {
1697     Error *local_err = NULL;
1698     LinkProperty *prop = g_malloc(sizeof(*prop));
1699     gchar *full_type;
1700     ObjectProperty *op;
1701
1702     prop->child = child;
1703     prop->check = check;
1704     prop->flags = flags;
1705
1706     full_type = g_strdup_printf("link<%s>", type);
1707
1708     op = object_property_add(obj, name, full_type,
1709                              object_get_link_property,
1710                              check ? object_set_link_property : NULL,
1711                              object_release_link_property,
1712                              prop,
1713                              &local_err);
1714     if (local_err) {
1715         error_propagate(errp, local_err);
1716         g_free(prop);
1717         goto out;
1718     }
1719
1720     op->resolve = object_resolve_link_property;
1721
1722 out:
1723     g_free(full_type);
1724 }
1725
1726 void object_property_add_const_link(Object *obj, const char *name,
1727                                     Object *target, Error **errp)
1728 {
1729     char *link_type;
1730     ObjectProperty *op;
1731
1732     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1733     op = object_property_add(obj, name, link_type,
1734                              object_get_child_property, NULL,
1735                              NULL, target, errp);
1736     if (op != NULL) {
1737         op->resolve = object_resolve_child_property;
1738     }
1739     g_free(link_type);
1740 }
1741
1742 gchar *object_get_canonical_path_component(Object *obj)
1743 {
1744     ObjectProperty *prop = NULL;
1745     GHashTableIter iter;
1746
1747     if (obj->parent == NULL) {
1748         return NULL;
1749     }
1750
1751     g_hash_table_iter_init(&iter, obj->parent->properties);
1752     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1753         if (!object_property_is_child(prop)) {
1754             continue;
1755         }
1756
1757         if (prop->opaque == obj) {
1758             return g_strdup(prop->name);
1759         }
1760     }
1761
1762     /* obj had a parent but was not a child, should never happen */
1763     g_assert_not_reached();
1764     return NULL;
1765 }
1766
1767 gchar *object_get_canonical_path(Object *obj)
1768 {
1769     Object *root = object_get_root();
1770     char *newpath, *path = NULL;
1771
1772     if (obj == root) {
1773         return g_strdup("/");
1774     }
1775
1776     do {
1777         char *component = object_get_canonical_path_component(obj);
1778
1779         if (!component) {
1780             /* A canonical path must be complete, so discard what was
1781              * collected so far.
1782              */
1783             g_free(path);
1784             return NULL;
1785         }
1786
1787         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
1788         g_free(path);
1789         g_free(component);
1790         path = newpath;
1791         obj = obj->parent;
1792     } while (obj != root);
1793
1794     return path;
1795 }
1796
1797 Object *object_resolve_path_component(Object *parent, const gchar *part)
1798 {
1799     ObjectProperty *prop = object_property_find(parent, part, NULL);
1800     if (prop == NULL) {
1801         return NULL;
1802     }
1803
1804     if (prop->resolve) {
1805         return prop->resolve(parent, prop->opaque, part);
1806     } else {
1807         return NULL;
1808     }
1809 }
1810
1811 static Object *object_resolve_abs_path(Object *parent,
1812                                           gchar **parts,
1813                                           const char *typename,
1814                                           int index)
1815 {
1816     Object *child;
1817
1818     if (parts[index] == NULL) {
1819         return object_dynamic_cast(parent, typename);
1820     }
1821
1822     if (strcmp(parts[index], "") == 0) {
1823         return object_resolve_abs_path(parent, parts, typename, index + 1);
1824     }
1825
1826     child = object_resolve_path_component(parent, parts[index]);
1827     if (!child) {
1828         return NULL;
1829     }
1830
1831     return object_resolve_abs_path(child, parts, typename, index + 1);
1832 }
1833
1834 static Object *object_resolve_partial_path(Object *parent,
1835                                               gchar **parts,
1836                                               const char *typename,
1837                                               bool *ambiguous)
1838 {
1839     Object *obj;
1840     GHashTableIter iter;
1841     ObjectProperty *prop;
1842
1843     obj = object_resolve_abs_path(parent, parts, typename, 0);
1844
1845     g_hash_table_iter_init(&iter, parent->properties);
1846     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1847         Object *found;
1848
1849         if (!object_property_is_child(prop)) {
1850             continue;
1851         }
1852
1853         found = object_resolve_partial_path(prop->opaque, parts,
1854                                             typename, ambiguous);
1855         if (found) {
1856             if (obj) {
1857                 *ambiguous = true;
1858                 return NULL;
1859             }
1860             obj = found;
1861         }
1862
1863         if (*ambiguous) {
1864             return NULL;
1865         }
1866     }
1867
1868     return obj;
1869 }
1870
1871 Object *object_resolve_path_type(const char *path, const char *typename,
1872                                  bool *ambiguousp)
1873 {
1874     Object *obj;
1875     gchar **parts;
1876
1877     parts = g_strsplit(path, "/", 0);
1878     assert(parts);
1879
1880     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1881         bool ambiguous = false;
1882         obj = object_resolve_partial_path(object_get_root(), parts,
1883                                           typename, &ambiguous);
1884         if (ambiguousp) {
1885             *ambiguousp = ambiguous;
1886         }
1887     } else {
1888         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1889     }
1890
1891     g_strfreev(parts);
1892
1893     return obj;
1894 }
1895
1896 Object *object_resolve_path(const char *path, bool *ambiguous)
1897 {
1898     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1899 }
1900
1901 typedef struct StringProperty
1902 {
1903     char *(*get)(Object *, Error **);
1904     void (*set)(Object *, const char *, Error **);
1905 } StringProperty;
1906
1907 static void property_get_str(Object *obj, Visitor *v, const char *name,
1908                              void *opaque, Error **errp)
1909 {
1910     StringProperty *prop = opaque;
1911     char *value;
1912     Error *err = NULL;
1913
1914     value = prop->get(obj, &err);
1915     if (err) {
1916         error_propagate(errp, err);
1917         return;
1918     }
1919
1920     visit_type_str(v, name, &value, errp);
1921     g_free(value);
1922 }
1923
1924 static void property_set_str(Object *obj, Visitor *v, const char *name,
1925                              void *opaque, Error **errp)
1926 {
1927     StringProperty *prop = opaque;
1928     char *value;
1929     Error *local_err = NULL;
1930
1931     visit_type_str(v, name, &value, &local_err);
1932     if (local_err) {
1933         error_propagate(errp, local_err);
1934         return;
1935     }
1936
1937     prop->set(obj, value, errp);
1938     g_free(value);
1939 }
1940
1941 static void property_release_str(Object *obj, const char *name,
1942                                  void *opaque)
1943 {
1944     StringProperty *prop = opaque;
1945     g_free(prop);
1946 }
1947
1948 void object_property_add_str(Object *obj, const char *name,
1949                            char *(*get)(Object *, Error **),
1950                            void (*set)(Object *, const char *, Error **),
1951                            Error **errp)
1952 {
1953     Error *local_err = NULL;
1954     StringProperty *prop = g_malloc0(sizeof(*prop));
1955
1956     prop->get = get;
1957     prop->set = set;
1958
1959     object_property_add(obj, name, "string",
1960                         get ? property_get_str : NULL,
1961                         set ? property_set_str : NULL,
1962                         property_release_str,
1963                         prop, &local_err);
1964     if (local_err) {
1965         error_propagate(errp, local_err);
1966         g_free(prop);
1967     }
1968 }
1969
1970 void object_class_property_add_str(ObjectClass *klass, const char *name,
1971                                    char *(*get)(Object *, Error **),
1972                                    void (*set)(Object *, const char *,
1973                                                Error **),
1974                                    Error **errp)
1975 {
1976     Error *local_err = NULL;
1977     StringProperty *prop = g_malloc0(sizeof(*prop));
1978
1979     prop->get = get;
1980     prop->set = set;
1981
1982     object_class_property_add(klass, name, "string",
1983                               get ? property_get_str : NULL,
1984                               set ? property_set_str : NULL,
1985                               property_release_str,
1986                               prop, &local_err);
1987     if (local_err) {
1988         error_propagate(errp, local_err);
1989         g_free(prop);
1990     }
1991 }
1992
1993 typedef struct BoolProperty
1994 {
1995     bool (*get)(Object *, Error **);
1996     void (*set)(Object *, bool, Error **);
1997 } BoolProperty;
1998
1999 static void property_get_bool(Object *obj, Visitor *v, const char *name,
2000                               void *opaque, Error **errp)
2001 {
2002     BoolProperty *prop = opaque;
2003     bool value;
2004     Error *err = NULL;
2005
2006     value = prop->get(obj, &err);
2007     if (err) {
2008         error_propagate(errp, err);
2009         return;
2010     }
2011
2012     visit_type_bool(v, name, &value, errp);
2013 }
2014
2015 static void property_set_bool(Object *obj, Visitor *v, const char *name,
2016                               void *opaque, Error **errp)
2017 {
2018     BoolProperty *prop = opaque;
2019     bool value;
2020     Error *local_err = NULL;
2021
2022     visit_type_bool(v, name, &value, &local_err);
2023     if (local_err) {
2024         error_propagate(errp, local_err);
2025         return;
2026     }
2027
2028     prop->set(obj, value, errp);
2029 }
2030
2031 static void property_release_bool(Object *obj, const char *name,
2032                                   void *opaque)
2033 {
2034     BoolProperty *prop = opaque;
2035     g_free(prop);
2036 }
2037
2038 void object_property_add_bool(Object *obj, const char *name,
2039                               bool (*get)(Object *, Error **),
2040                               void (*set)(Object *, bool, Error **),
2041                               Error **errp)
2042 {
2043     Error *local_err = NULL;
2044     BoolProperty *prop = g_malloc0(sizeof(*prop));
2045
2046     prop->get = get;
2047     prop->set = set;
2048
2049     object_property_add(obj, name, "bool",
2050                         get ? property_get_bool : NULL,
2051                         set ? property_set_bool : NULL,
2052                         property_release_bool,
2053                         prop, &local_err);
2054     if (local_err) {
2055         error_propagate(errp, local_err);
2056         g_free(prop);
2057     }
2058 }
2059
2060 void object_class_property_add_bool(ObjectClass *klass, const char *name,
2061                                     bool (*get)(Object *, Error **),
2062                                     void (*set)(Object *, bool, Error **),
2063                                     Error **errp)
2064 {
2065     Error *local_err = NULL;
2066     BoolProperty *prop = g_malloc0(sizeof(*prop));
2067
2068     prop->get = get;
2069     prop->set = set;
2070
2071     object_class_property_add(klass, name, "bool",
2072                               get ? property_get_bool : NULL,
2073                               set ? property_set_bool : NULL,
2074                               property_release_bool,
2075                               prop, &local_err);
2076     if (local_err) {
2077         error_propagate(errp, local_err);
2078         g_free(prop);
2079     }
2080 }
2081
2082 static void property_get_enum(Object *obj, Visitor *v, const char *name,
2083                               void *opaque, Error **errp)
2084 {
2085     EnumProperty *prop = opaque;
2086     int value;
2087     Error *err = NULL;
2088
2089     value = prop->get(obj, &err);
2090     if (err) {
2091         error_propagate(errp, err);
2092         return;
2093     }
2094
2095     visit_type_enum(v, name, &value, prop->lookup, errp);
2096 }
2097
2098 static void property_set_enum(Object *obj, Visitor *v, const char *name,
2099                               void *opaque, Error **errp)
2100 {
2101     EnumProperty *prop = opaque;
2102     int value;
2103     Error *err = NULL;
2104
2105     visit_type_enum(v, name, &value, prop->lookup, &err);
2106     if (err) {
2107         error_propagate(errp, err);
2108         return;
2109     }
2110     prop->set(obj, value, errp);
2111 }
2112
2113 static void property_release_enum(Object *obj, const char *name,
2114                                   void *opaque)
2115 {
2116     EnumProperty *prop = opaque;
2117     g_free(prop);
2118 }
2119
2120 void object_property_add_enum(Object *obj, const char *name,
2121                               const char *typename,
2122                               const QEnumLookup *lookup,
2123                               int (*get)(Object *, Error **),
2124                               void (*set)(Object *, int, Error **),
2125                               Error **errp)
2126 {
2127     Error *local_err = NULL;
2128     EnumProperty *prop = g_malloc(sizeof(*prop));
2129
2130     prop->lookup = lookup;
2131     prop->get = get;
2132     prop->set = set;
2133
2134     object_property_add(obj, name, typename,
2135                         get ? property_get_enum : NULL,
2136                         set ? property_set_enum : NULL,
2137                         property_release_enum,
2138                         prop, &local_err);
2139     if (local_err) {
2140         error_propagate(errp, local_err);
2141         g_free(prop);
2142     }
2143 }
2144
2145 void object_class_property_add_enum(ObjectClass *klass, const char *name,
2146                                     const char *typename,
2147                                     const QEnumLookup *lookup,
2148                                     int (*get)(Object *, Error **),
2149                                     void (*set)(Object *, int, Error **),
2150                                     Error **errp)
2151 {
2152     Error *local_err = NULL;
2153     EnumProperty *prop = g_malloc(sizeof(*prop));
2154
2155     prop->lookup = lookup;
2156     prop->get = get;
2157     prop->set = set;
2158
2159     object_class_property_add(klass, name, typename,
2160                               get ? property_get_enum : NULL,
2161                               set ? property_set_enum : NULL,
2162                               property_release_enum,
2163                               prop, &local_err);
2164     if (local_err) {
2165         error_propagate(errp, local_err);
2166         g_free(prop);
2167     }
2168 }
2169
2170 typedef struct TMProperty {
2171     void (*get)(Object *, struct tm *, Error **);
2172 } TMProperty;
2173
2174 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2175                             void *opaque, Error **errp)
2176 {
2177     TMProperty *prop = opaque;
2178     Error *err = NULL;
2179     struct tm value;
2180
2181     prop->get(obj, &value, &err);
2182     if (err) {
2183         goto out;
2184     }
2185
2186     visit_start_struct(v, name, NULL, 0, &err);
2187     if (err) {
2188         goto out;
2189     }
2190     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2191     if (err) {
2192         goto out_end;
2193     }
2194     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2195     if (err) {
2196         goto out_end;
2197     }
2198     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2199     if (err) {
2200         goto out_end;
2201     }
2202     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2203     if (err) {
2204         goto out_end;
2205     }
2206     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2207     if (err) {
2208         goto out_end;
2209     }
2210     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2211     if (err) {
2212         goto out_end;
2213     }
2214     visit_check_struct(v, &err);
2215 out_end:
2216     visit_end_struct(v, NULL);
2217 out:
2218     error_propagate(errp, err);
2219
2220 }
2221
2222 static void property_release_tm(Object *obj, const char *name,
2223                                 void *opaque)
2224 {
2225     TMProperty *prop = opaque;
2226     g_free(prop);
2227 }
2228
2229 void object_property_add_tm(Object *obj, const char *name,
2230                             void (*get)(Object *, struct tm *, Error **),
2231                             Error **errp)
2232 {
2233     Error *local_err = NULL;
2234     TMProperty *prop = g_malloc0(sizeof(*prop));
2235
2236     prop->get = get;
2237
2238     object_property_add(obj, name, "struct tm",
2239                         get ? property_get_tm : NULL, NULL,
2240                         property_release_tm,
2241                         prop, &local_err);
2242     if (local_err) {
2243         error_propagate(errp, local_err);
2244         g_free(prop);
2245     }
2246 }
2247
2248 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2249                                   void (*get)(Object *, struct tm *, Error **),
2250                                   Error **errp)
2251 {
2252     Error *local_err = NULL;
2253     TMProperty *prop = g_malloc0(sizeof(*prop));
2254
2255     prop->get = get;
2256
2257     object_class_property_add(klass, name, "struct tm",
2258                               get ? property_get_tm : NULL, NULL,
2259                               property_release_tm,
2260                               prop, &local_err);
2261     if (local_err) {
2262         error_propagate(errp, local_err);
2263         g_free(prop);
2264     }
2265 }
2266
2267 static char *qdev_get_type(Object *obj, Error **errp)
2268 {
2269     return g_strdup(object_get_typename(obj));
2270 }
2271
2272 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2273                                    void *opaque, Error **errp)
2274 {
2275     uint8_t value = *(uint8_t *)opaque;
2276     visit_type_uint8(v, name, &value, errp);
2277 }
2278
2279 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2280                                     void *opaque, Error **errp)
2281 {
2282     uint16_t value = *(uint16_t *)opaque;
2283     visit_type_uint16(v, name, &value, errp);
2284 }
2285
2286 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2287                                     void *opaque, Error **errp)
2288 {
2289     uint32_t value = *(uint32_t *)opaque;
2290     visit_type_uint32(v, name, &value, errp);
2291 }
2292
2293 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2294                                     void *opaque, Error **errp)
2295 {
2296     uint64_t value = *(uint64_t *)opaque;
2297     visit_type_uint64(v, name, &value, errp);
2298 }
2299
2300 void object_property_add_uint8_ptr(Object *obj, const char *name,
2301                                    const uint8_t *v, Error **errp)
2302 {
2303     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2304                         NULL, NULL, (void *)v, errp);
2305 }
2306
2307 void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2308                                          const uint8_t *v, Error **errp)
2309 {
2310     object_class_property_add(klass, name, "uint8", property_get_uint8_ptr,
2311                               NULL, NULL, (void *)v, errp);
2312 }
2313
2314 void object_property_add_uint16_ptr(Object *obj, const char *name,
2315                                     const uint16_t *v, Error **errp)
2316 {
2317     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2318                         NULL, NULL, (void *)v, errp);
2319 }
2320
2321 void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2322                                           const uint16_t *v, Error **errp)
2323 {
2324     object_class_property_add(klass, name, "uint16", property_get_uint16_ptr,
2325                               NULL, NULL, (void *)v, errp);
2326 }
2327
2328 void object_property_add_uint32_ptr(Object *obj, const char *name,
2329                                     const uint32_t *v, Error **errp)
2330 {
2331     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2332                         NULL, NULL, (void *)v, errp);
2333 }
2334
2335 void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2336                                           const uint32_t *v, Error **errp)
2337 {
2338     object_class_property_add(klass, name, "uint32", property_get_uint32_ptr,
2339                               NULL, NULL, (void *)v, errp);
2340 }
2341
2342 void object_property_add_uint64_ptr(Object *obj, const char *name,
2343                                     const uint64_t *v, Error **errp)
2344 {
2345     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2346                         NULL, NULL, (void *)v, errp);
2347 }
2348
2349 void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2350                                           const uint64_t *v, Error **errp)
2351 {
2352     object_class_property_add(klass, name, "uint64", property_get_uint64_ptr,
2353                               NULL, NULL, (void *)v, errp);
2354 }
2355
2356 typedef struct {
2357     Object *target_obj;
2358     char *target_name;
2359 } AliasProperty;
2360
2361 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2362                                void *opaque, Error **errp)
2363 {
2364     AliasProperty *prop = opaque;
2365
2366     object_property_get(prop->target_obj, v, prop->target_name, errp);
2367 }
2368
2369 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2370                                void *opaque, Error **errp)
2371 {
2372     AliasProperty *prop = opaque;
2373
2374     object_property_set(prop->target_obj, v, prop->target_name, errp);
2375 }
2376
2377 static Object *property_resolve_alias(Object *obj, void *opaque,
2378                                       const gchar *part)
2379 {
2380     AliasProperty *prop = opaque;
2381
2382     return object_resolve_path_component(prop->target_obj, prop->target_name);
2383 }
2384
2385 static void property_release_alias(Object *obj, const char *name, void *opaque)
2386 {
2387     AliasProperty *prop = opaque;
2388
2389     g_free(prop->target_name);
2390     g_free(prop);
2391 }
2392
2393 void object_property_add_alias(Object *obj, const char *name,
2394                                Object *target_obj, const char *target_name,
2395                                Error **errp)
2396 {
2397     AliasProperty *prop;
2398     ObjectProperty *op;
2399     ObjectProperty *target_prop;
2400     gchar *prop_type;
2401     Error *local_err = NULL;
2402
2403     target_prop = object_property_find(target_obj, target_name, errp);
2404     if (!target_prop) {
2405         return;
2406     }
2407
2408     if (object_property_is_child(target_prop)) {
2409         prop_type = g_strdup_printf("link%s",
2410                                     target_prop->type + strlen("child"));
2411     } else {
2412         prop_type = g_strdup(target_prop->type);
2413     }
2414
2415     prop = g_malloc(sizeof(*prop));
2416     prop->target_obj = target_obj;
2417     prop->target_name = g_strdup(target_name);
2418
2419     op = object_property_add(obj, name, prop_type,
2420                              property_get_alias,
2421                              property_set_alias,
2422                              property_release_alias,
2423                              prop, &local_err);
2424     if (local_err) {
2425         error_propagate(errp, local_err);
2426         g_free(prop);
2427         goto out;
2428     }
2429     op->resolve = property_resolve_alias;
2430
2431     object_property_set_description(obj, op->name,
2432                                     target_prop->description,
2433                                     &error_abort);
2434
2435 out:
2436     g_free(prop_type);
2437 }
2438
2439 void object_property_set_description(Object *obj, const char *name,
2440                                      const char *description, Error **errp)
2441 {
2442     ObjectProperty *op;
2443
2444     op = object_property_find(obj, name, errp);
2445     if (!op) {
2446         return;
2447     }
2448
2449     g_free(op->description);
2450     op->description = g_strdup(description);
2451 }
2452
2453 void object_class_property_set_description(ObjectClass *klass,
2454                                            const char *name,
2455                                            const char *description,
2456                                            Error **errp)
2457 {
2458     ObjectProperty *op;
2459
2460     op = g_hash_table_lookup(klass->properties, name);
2461     if (!op) {
2462         error_setg(errp, "Property '.%s' not found", name);
2463         return;
2464     }
2465
2466     g_free(op->description);
2467     op->description = g_strdup(description);
2468 }
2469
2470 static void object_class_init(ObjectClass *klass, void *data)
2471 {
2472     object_class_property_add_str(klass, "type", qdev_get_type,
2473                                   NULL, &error_abort);
2474 }
2475
2476 static void register_types(void)
2477 {
2478     static TypeInfo interface_info = {
2479         .name = TYPE_INTERFACE,
2480         .class_size = sizeof(InterfaceClass),
2481         .abstract = true,
2482     };
2483
2484     static TypeInfo object_info = {
2485         .name = TYPE_OBJECT,
2486         .instance_size = sizeof(Object),
2487         .class_init = object_class_init,
2488         .abstract = true,
2489     };
2490
2491     type_interface = type_register_internal(&interface_info);
2492     type_register_internal(&object_info);
2493 }
2494
2495 type_init(register_types)