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 #include "qemu/error-report.h"
  32
  33 #define MAX_INTERFACES 32
  34
  35 typedef struct InterfaceImpl InterfaceImpl;
  36 typedef struct TypeImpl TypeImpl;
  37
  38 struct InterfaceImpl
  39 {
  40     const char *typename;
  41 };
  42
  43 struct TypeImpl
  44 {
  45     const char *name;
  46
  47     size_t class_size;
  48
  49     size_t instance_size;
  50
  51     void (*class_init)(ObjectClass *klass, void *data);
  52     void (*class_base_init)(ObjectClass *klass, void *data);
  53
  54     void *class_data;
  55
  56     void (*instance_init)(Object *obj);
  57     void (*instance_post_init)(Object *obj);
  58     void (*instance_finalize)(Object *obj);
  59
  60     bool abstract;
  61
  62     const char *parent;
  63     TypeImpl *parent_type;
  64
  65     ObjectClass *class;
  66
  67     int num_interfaces;
  68     InterfaceImpl interfaces[MAX_INTERFACES];
  69 };
  70
  71 static Type type_interface;
  72
  73 static GHashTable *type_table_get(void)
  74 {
  75     static GHashTable *type_table;
  76
  77     if (type_table == NULL) {
  78         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  79     }
  80
  81     return type_table;
  82 }
  83
  84 static bool enumerating_types;
  85
  86 static void type_table_add(TypeImpl *ti)
  87 {
  88     assert(!enumerating_types);
  89     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  90 }
  91
  92 static TypeImpl *type_table_lookup(const char *name)
  93 {
  94     return g_hash_table_lookup(type_table_get(), name);
  95 }
  96
  97 static TypeImpl *type_new(const TypeInfo *info)
  98 {
  99     TypeImpl *ti = g_malloc0(sizeof(*ti));
 100     int i;
 101
 102     g_assert(info->name != NULL);
 103
 104     if (type_table_lookup(info->name) != NULL) {
 105         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 106         abort();
 107     }
 108
 109     ti->name = g_strdup(info->name);
 110     ti->parent = g_strdup(info->parent);
 111
 112     ti->class_size = info->class_size;
 113     ti->instance_size = info->instance_size;
 114
 115     ti->class_init = info->class_init;
 116     ti->class_base_init = info->class_base_init;
 117     ti->class_data = info->class_data;
 118
 119     ti->instance_init = info->instance_init;
 120     ti->instance_post_init = info->instance_post_init;
 121     ti->instance_finalize = info->instance_finalize;
 122
 123     ti->abstract = info->abstract;
 124
 125     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 126         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 127     }
 128     ti->num_interfaces = i;
 129
 130     return ti;
 131 }
 132
 133 static TypeImpl *type_register_internal(const TypeInfo *info)
 134 {
 135     TypeImpl *ti;
 136     ti = type_new(info);
 137
 138     type_table_add(ti);
 139     return ti;
 140 }
 141
 142 TypeImpl *type_register(const TypeInfo *info)
 143 {
 144     assert(info->parent);
 145     return type_register_internal(info);
 146 }
 147
 148 TypeImpl *type_register_static(const TypeInfo *info)
 149 {
 150     return type_register(info);
 151 }
 152
 153 void type_register_static_array(const TypeInfo *infos, int nr_infos)
 154 {
 155     int i;
 156
 157     for (i = 0; i < nr_infos; i++) {
 158         type_register_static(&infos[i]);
 159     }
 160 }
 161
 162 static TypeImpl *type_get_by_name(const char *name)
 163 {
 164     if (name == NULL) {
 165         return NULL;
 166     }
 167
 168     return type_table_lookup(name);
 169 }
 170
 171 static TypeImpl *type_get_parent(TypeImpl *type)
 172 {
 173     if (!type->parent_type && type->parent) {
 174         type->parent_type = type_get_by_name(type->parent);
 175         g_assert(type->parent_type != NULL);
 176     }
 177
 178     return type->parent_type;
 179 }
 180
 181 static bool type_has_parent(TypeImpl *type)
 182 {
 183     return (type->parent != NULL);
 184 }
 185
 186 static size_t type_class_get_size(TypeImpl *ti)
 187 {
 188     if (ti->class_size) {
 189         return ti->class_size;
 190     }
 191
 192     if (type_has_parent(ti)) {
 193         return type_class_get_size(type_get_parent(ti));
 194     }
 195
 196     return sizeof(ObjectClass);
 197 }
 198
 199 static size_t type_object_get_size(TypeImpl *ti)
 200 {
 201     if (ti->instance_size) {
 202         return ti->instance_size;
 203     }
 204
 205     if (type_has_parent(ti)) {
 206         return type_object_get_size(type_get_parent(ti));
 207     }
 208
 209     return 0;
 210 }
 211
 212 size_t object_type_get_instance_size(const char *typename)
 213 {
 214     TypeImpl *type = type_get_by_name(typename);
 215
 216     g_assert(type != NULL);
 217     return type_object_get_size(type);
 218 }
 219
 220 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 221 {
 222     assert(target_type);
 223
 224     /* Check if target_type is a direct ancestor of type */
 225     while (type) {
 226         if (type == target_type) {
 227             return true;
 228         }
 229
 230         type = type_get_parent(type);
 231     }
 232
 233     return false;
 234 }
 235
 236 static void type_initialize(TypeImpl *ti);
 237
 238 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 239                                       TypeImpl *parent_type)
 240 {
 241     InterfaceClass *new_iface;
 242     TypeInfo info = { };
 243     TypeImpl *iface_impl;
 244
 245     info.parent = parent_type->name;
 246     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 247     info.abstract = true;
 248
 249     iface_impl = type_new(&info);
 250     iface_impl->parent_type = parent_type;
 251     type_initialize(iface_impl);
 252     g_free((char *)info.name);
 253
 254     new_iface = (InterfaceClass *)iface_impl->class;
 255     new_iface->concrete_class = ti->class;
 256     new_iface->interface_type = interface_type;
 257
 258     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 259                                            iface_impl->class);
 260 }
 261
 262 static void object_property_free(gpointer data)
 263 {
 264     ObjectProperty *prop = data;
 265
 266     g_free(prop->name);
 267     g_free(prop->type);
 268     g_free(prop->description);
 269     g_free(prop);
 270 }
 271
 272 static void type_initialize(TypeImpl *ti)
 273 {
 274     TypeImpl *parent;
 275
 276     if (ti->class) {
 277         return;
 278     }
 279
 280     ti->class_size = type_class_get_size(ti);
 281     ti->instance_size = type_object_get_size(ti);
 282     /* Any type with zero instance_size is implicitly abstract.
 283      * This means interface types are all abstract.
 284      */
 285     if (ti->instance_size == 0) {
 286         ti->abstract = true;
 287     }
 288     if (type_is_ancestor(ti, type_interface)) {
 289         assert(ti->instance_size == 0);
 290         assert(ti->abstract);
 291         assert(!ti->instance_init);
 292         assert(!ti->instance_post_init);
 293         assert(!ti->instance_finalize);
 294         assert(!ti->num_interfaces);
 295     }
 296     ti->class = g_malloc0(ti->class_size);
 297
 298     parent = type_get_parent(ti);
 299     if (parent) {
 300         type_initialize(parent);
 301         GSList *e;
 302         int i;
 303
 304         g_assert(parent->class_size <= ti->class_size);
 305         memcpy(ti->class, parent->class, parent->class_size);
 306         ti->class->interfaces = NULL;
 307         ti->class->properties = g_hash_table_new_full(
 308             g_str_hash, g_str_equal, g_free, object_property_free);
 309
 310         for (e = parent->class->interfaces; e; e = e->next) {
 311             InterfaceClass *iface = e->data;
 312             ObjectClass *klass = OBJECT_CLASS(iface);
 313
 314             type_initialize_interface(ti, iface->interface_type, klass->type);
 315         }
 316
 317         for (i = 0; i < ti->num_interfaces; i++) {
 318             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 319             for (e = ti->class->interfaces; e; e = e->next) {
 320                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 321
 322                 if (type_is_ancestor(target_type, t)) {
 323                     break;
 324                 }
 325             }
 326
 327             if (e) {
 328                 continue;
 329             }
 330
 331             type_initialize_interface(ti, t, t);
 332         }
 333     } else {
 334         ti->class->properties = g_hash_table_new_full(
 335             g_str_hash, g_str_equal, g_free, object_property_free);
 336     }
 337
 338     ti->class->type = ti;
 339
 340     while (parent) {
 341         if (parent->class_base_init) {
 342             parent->class_base_init(ti->class, ti->class_data);
 343         }
 344         parent = type_get_parent(parent);
 345     }
 346
 347     if (ti->class_init) {
 348         ti->class_init(ti->class, ti->class_data);
 349     }
 350 }
 351
 352 static void object_init_with_type(Object *obj, TypeImpl *ti)
 353 {
 354     if (type_has_parent(ti)) {
 355         object_init_with_type(obj, type_get_parent(ti));
 356     }
 357
 358     if (ti->instance_init) {
 359         ti->instance_init(obj);
 360     }
 361 }
 362
 363 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 364 {
 365     if (ti->instance_post_init) {
 366         ti->instance_post_init(obj);
 367     }
 368
 369     if (type_has_parent(ti)) {
 370         object_post_init_with_type(obj, type_get_parent(ti));
 371     }
 372 }
 373
 374 void object_apply_global_props(Object *obj, const GPtrArray *props, Error **errp)
 375 {
 376     int i;
 377
 378     if (!props) {
 379         return;
 380     }
 381
 382     for (i = 0; i < props->len; i++) {
 383         GlobalProperty *p = g_ptr_array_index(props, i);
 384         Error *err = NULL;
 385
 386         if (object_dynamic_cast(obj, p->driver) == NULL) {
 387             continue;
 388         }
 389         p->used = true;
 390         object_property_parse(obj, p->value, p->property, &err);
 391         if (err != NULL) {
 392             error_prepend(&err, "can't apply global %s.%s=%s: ",
 393                           p->driver, p->property, p->value);
 394             /*
 395              * If errp != NULL, propagate error and return.
 396              * If errp == NULL, report a warning, but keep going
 397              * with the remaining globals.
 398              */
 399             if (errp) {
 400                 error_propagate(errp, err);
 401                 return;
 402             } else {
 403                 warn_report_err(err);
 404             }
 405         }
 406     }
 407 }
 408
 409 /*
 410  * Global property defaults
 411  * Slot 0: accelerator's global property defaults
 412  * Slot 1: machine's global property defaults
 413  * Each is a GPtrArray of of GlobalProperty.
 414  * Applied in order, later entries override earlier ones.
 415  */
 416 static GPtrArray *object_compat_props[2];
 417
 418 /*
 419  * Set machine's global property defaults to @compat_props.
 420  * May be called at most once.
 421  */
 422 void object_set_machine_compat_props(GPtrArray *compat_props)
 423 {
 424     assert(!object_compat_props[1]);
 425     object_compat_props[1] = compat_props;
 426 }
 427
 428 /*
 429  * Set accelerator's global property defaults to @compat_props.
 430  * May be called at most once.
 431  */
 432 void object_set_accelerator_compat_props(GPtrArray *compat_props)
 433 {
 434     assert(!object_compat_props[0]);
 435     object_compat_props[0] = compat_props;
 436 }
 437
 438 void object_apply_compat_props(Object *obj)
 439 {
 440     int i;
 441
 442     for (i = 0; i < ARRAY_SIZE(object_compat_props); i++) {
 443         object_apply_global_props(obj, object_compat_props[i],
 444                                   &error_abort);
 445     }
 446 }
 447
 448 static void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 449 {
 450     Object *obj = data;
 451
 452     type_initialize(type);
 453
 454     g_assert(type->instance_size >= sizeof(Object));
 455     g_assert(type->abstract == false);
 456     g_assert(size >= type->instance_size);
 457
 458     memset(obj, 0, type->instance_size);
 459     obj->class = type->class;
 460     object_ref(obj);
 461     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 462                                             NULL, object_property_free);
 463     object_init_with_type(obj, type);
 464     object_post_init_with_type(obj, type);
 465 }
 466
 467 void object_initialize(void *data, size_t size, const char *typename)
 468 {
 469     TypeImpl *type = type_get_by_name(typename);
 470
 471     if (!type) {
 472         error_report("missing object type '%s'", typename);
 473         abort();
 474     }
 475
 476     object_initialize_with_type(data, size, type);
 477 }
 478
 479 void object_initialize_child(Object *parentobj, const char *propname,
 480                              void *childobj, size_t size, const char *type,
 481                              Error **errp, ...)
 482 {
 483     va_list vargs;
 484
 485     va_start(vargs, errp);
 486     object_initialize_childv(parentobj, propname, childobj, size, type, errp,
 487                              vargs);
 488     va_end(vargs);
 489 }
 490
 491 void object_initialize_childv(Object *parentobj, const char *propname,
 492                               void *childobj, size_t size, const char *type,
 493                               Error **errp, va_list vargs)
 494 {
 495     Error *local_err = NULL;
 496     Object *obj;
 497     UserCreatable *uc;
 498
 499     object_initialize(childobj, size, type);
 500     obj = OBJECT(childobj);
 501
 502     object_set_propv(obj, &local_err, vargs);
 503     if (local_err) {
 504         goto out;
 505     }
 506
 507     object_property_add_child(parentobj, propname, obj, &local_err);
 508     if (local_err) {
 509         goto out;
 510     }
 511
 512     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 513     if (uc) {
 514         user_creatable_complete(uc, &local_err);
 515         if (local_err) {
 516             object_unparent(obj);
 517             goto out;
 518         }
 519     }
 520
 521     /*
 522      * Since object_property_add_child added a reference to the child object,
 523      * we can drop the reference added by object_initialize(), so the child
 524      * property will own the only reference to the object.
 525      */
 526     object_unref(obj);
 527
 528 out:
 529     if (local_err) {
 530         error_propagate(errp, local_err);
 531         object_unref(obj);
 532     }
 533 }
 534
 535 static inline bool object_property_is_child(ObjectProperty *prop)
 536 {
 537     return strstart(prop->type, "child<", NULL);
 538 }
 539
 540 static void object_property_del_all(Object *obj)
 541 {
 542     ObjectProperty *prop;
 543     GHashTableIter iter;
 544     gpointer key, value;
 545     bool released;
 546
 547     do {
 548         released = false;
 549         g_hash_table_iter_init(&iter, obj->properties);
 550         while (g_hash_table_iter_next(&iter, &key, &value)) {
 551             prop = value;
 552             if (prop->release) {
 553                 prop->release(obj, prop->name, prop->opaque);
 554                 prop->release = NULL;
 555                 released = true;
 556                 break;
 557             }
 558             g_hash_table_iter_remove(&iter);
 559         }
 560     } while (released);
 561
 562     g_hash_table_unref(obj->properties);
 563 }
 564
 565 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 566 {
 567     ObjectProperty *prop;
 568     GHashTableIter iter;
 569     gpointer key, value;
 570
 571     g_hash_table_iter_init(&iter, obj->properties);
 572     while (g_hash_table_iter_next(&iter, &key, &value)) {
 573         prop = value;
 574         if (object_property_is_child(prop) && prop->opaque == child) {
 575             if (prop->release) {
 576                 prop->release(obj, prop->name, prop->opaque);
 577                 prop->release = NULL;
 578             }
 579             break;
 580         }
 581     }
 582     g_hash_table_iter_init(&iter, obj->properties);
 583     while (g_hash_table_iter_next(&iter, &key, &value)) {
 584         prop = value;
 585         if (object_property_is_child(prop) && prop->opaque == child) {
 586             g_hash_table_iter_remove(&iter);
 587             break;
 588         }
 589     }
 590 }
 591
 592 void object_unparent(Object *obj)
 593 {
 594     if (obj->parent) {
 595         object_property_del_child(obj->parent, obj, NULL);
 596     }
 597 }
 598
 599 static void object_deinit(Object *obj, TypeImpl *type)
 600 {
 601     if (type->instance_finalize) {
 602         type->instance_finalize(obj);
 603     }
 604
 605     if (type_has_parent(type)) {
 606         object_deinit(obj, type_get_parent(type));
 607     }
 608 }
 609
 610 static void object_finalize(void *data)
 611 {
 612     Object *obj = data;
 613     TypeImpl *ti = obj->class->type;
 614
 615     object_property_del_all(obj);
 616     object_deinit(obj, ti);
 617
 618     g_assert(obj->ref == 0);
 619     if (obj->free) {
 620         obj->free(obj);
 621     }
 622 }
 623
 624 static Object *object_new_with_type(Type type)
 625 {
 626     Object *obj;
 627
 628     g_assert(type != NULL);
 629     type_initialize(type);
 630
 631     obj = g_malloc(type->instance_size);
 632     object_initialize_with_type(obj, type->instance_size, type);
 633     obj->free = g_free;
 634
 635     return obj;
 636 }
 637
 638 Object *object_new(const char *typename)
 639 {
 640     TypeImpl *ti = type_get_by_name(typename);
 641
 642     return object_new_with_type(ti);
 643 }
 644
 645
 646 Object *object_new_with_props(const char *typename,
 647                               Object *parent,
 648                               const char *id,
 649                               Error **errp,
 650                               ...)
 651 {
 652     va_list vargs;
 653     Object *obj;
 654
 655     va_start(vargs, errp);
 656     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 657     va_end(vargs);
 658
 659     return obj;
 660 }
 661
 662
 663 Object *object_new_with_propv(const char *typename,
 664                               Object *parent,
 665                               const char *id,
 666                               Error **errp,
 667                               va_list vargs)
 668 {
 669     Object *obj;
 670     ObjectClass *klass;
 671     Error *local_err = NULL;
 672     UserCreatable *uc;
 673
 674     klass = object_class_by_name(typename);
 675     if (!klass) {
 676         error_setg(errp, "invalid object type: %s", typename);
 677         return NULL;
 678     }
 679
 680     if (object_class_is_abstract(klass)) {
 681         error_setg(errp, "object type '%s' is abstract", typename);
 682         return NULL;
 683     }
 684     obj = object_new_with_type(klass->type);
 685
 686     if (object_set_propv(obj, &local_err, vargs) < 0) {
 687         goto error;
 688     }
 689
 690     if (id != NULL) {
 691         object_property_add_child(parent, id, obj, &local_err);
 692         if (local_err) {
 693             goto error;
 694         }
 695     }
 696
 697     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 698     if (uc) {
 699         user_creatable_complete(uc, &local_err);
 700         if (local_err) {
 701             if (id != NULL) {
 702                 object_unparent(obj);
 703             }
 704             goto error;
 705         }
 706     }
 707
 708     object_unref(OBJECT(obj));
 709     return obj;
 710
 711  error:
 712     error_propagate(errp, local_err);
 713     object_unref(obj);
 714     return NULL;
 715 }
 716
 717
 718 int object_set_props(Object *obj,
 719                      Error **errp,
 720                      ...)
 721 {
 722     va_list vargs;
 723     int ret;
 724
 725     va_start(vargs, errp);
 726     ret = object_set_propv(obj, errp, vargs);
 727     va_end(vargs);
 728
 729     return ret;
 730 }
 731
 732
 733 int object_set_propv(Object *obj,
 734                      Error **errp,
 735                      va_list vargs)
 736 {
 737     const char *propname;
 738     Error *local_err = NULL;
 739
 740     propname = va_arg(vargs, char *);
 741     while (propname != NULL) {
 742         const char *value = va_arg(vargs, char *);
 743
 744         g_assert(value != NULL);
 745         object_property_parse(obj, value, propname, &local_err);
 746         if (local_err) {
 747             error_propagate(errp, local_err);
 748             return -1;
 749         }
 750         propname = va_arg(vargs, char *);
 751     }
 752
 753     return 0;
 754 }
 755
 756
 757 Object *object_dynamic_cast(Object *obj, const char *typename)
 758 {
 759     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 760         return obj;
 761     }
 762
 763     return NULL;
 764 }
 765
 766 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 767                                    const char *file, int line, const char *func)
 768 {
 769     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 770                                      typename, file, line, func);
 771
 772 #ifdef CONFIG_QOM_CAST_DEBUG
 773     int i;
 774     Object *inst;
 775
 776     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 777         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 778             goto out;
 779         }
 780     }
 781
 782     inst = object_dynamic_cast(obj, typename);
 783
 784     if (!inst && obj) {
 785         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 786                 file, line, func, obj, typename);
 787         abort();
 788     }
 789
 790     assert(obj == inst);
 791
 792     if (obj && obj == inst) {
 793         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 794             atomic_set(&obj->class->object_cast_cache[i - 1],
 795                        atomic_read(&obj->class->object_cast_cache[i]));
 796         }
 797         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 798     }
 799
 800 out:
 801 #endif
 802     return obj;
 803 }
 804
 805 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 806                                        const char *typename)
 807 {
 808     ObjectClass *ret = NULL;
 809     TypeImpl *target_type;
 810     TypeImpl *type;
 811
 812     if (!class) {
 813         return NULL;
 814     }
 815
 816     /* A simple fast path that can trigger a lot for leaf classes.  */
 817     type = class->type;
 818     if (type->name == typename) {
 819         return class;
 820     }
 821
 822     target_type = type_get_by_name(typename);
 823     if (!target_type) {
 824         /* target class type unknown, so fail the cast */
 825         return NULL;
 826     }
 827
 828     if (type->class->interfaces &&
 829             type_is_ancestor(target_type, type_interface)) {
 830         int found = 0;
 831         GSList *i;
 832
 833         for (i = class->interfaces; i; i = i->next) {
 834             ObjectClass *target_class = i->data;
 835
 836             if (type_is_ancestor(target_class->type, target_type)) {
 837                 ret = target_class;
 838                 found++;
 839             }
 840          }
 841
 842         /* The match was ambiguous, don't allow a cast */
 843         if (found > 1) {
 844             ret = NULL;
 845         }
 846     } else if (type_is_ancestor(type, target_type)) {
 847         ret = class;
 848     }
 849
 850     return ret;
 851 }
 852
 853 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 854                                               const char *typename,
 855                                               const char *file, int line,
 856                                               const char *func)
 857 {
 858     ObjectClass *ret;
 859
 860     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 861                                            typename, file, line, func);
 862
 863 #ifdef CONFIG_QOM_CAST_DEBUG
 864     int i;
 865
 866     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 867         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 868             ret = class;
 869             goto out;
 870         }
 871     }
 872 #else
 873     if (!class || !class->interfaces) {
 874         return class;
 875     }
 876 #endif
 877
 878     ret = object_class_dynamic_cast(class, typename);
 879     if (!ret && class) {
 880         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 881                 file, line, func, class, typename);
 882         abort();
 883     }
 884
 885 #ifdef CONFIG_QOM_CAST_DEBUG
 886     if (class && ret == class) {
 887         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 888             atomic_set(&class->class_cast_cache[i - 1],
 889                        atomic_read(&class->class_cast_cache[i]));
 890         }
 891         atomic_set(&class->class_cast_cache[i - 1], typename);
 892     }
 893 out:
 894 #endif
 895     return ret;
 896 }
 897
 898 const char *object_get_typename(const Object *obj)
 899 {
 900     return obj->class->type->name;
 901 }
 902
 903 ObjectClass *object_get_class(Object *obj)
 904 {
 905     return obj->class;
 906 }
 907
 908 bool object_class_is_abstract(ObjectClass *klass)
 909 {
 910     return klass->type->abstract;
 911 }
 912
 913 const char *object_class_get_name(ObjectClass *klass)
 914 {
 915     return klass->type->name;
 916 }
 917
 918 ObjectClass *object_class_by_name(const char *typename)
 919 {
 920     TypeImpl *type = type_get_by_name(typename);
 921
 922     if (!type) {
 923         return NULL;
 924     }
 925
 926     type_initialize(type);
 927
 928     return type->class;
 929 }
 930
 931 ObjectClass *object_class_get_parent(ObjectClass *class)
 932 {
 933     TypeImpl *type = type_get_parent(class->type);
 934
 935     if (!type) {
 936         return NULL;
 937     }
 938
 939     type_initialize(type);
 940
 941     return type->class;
 942 }
 943
 944 typedef struct OCFData
 945 {
 946     void (*fn)(ObjectClass *klass, void *opaque);
 947     const char *implements_type;
 948     bool include_abstract;
 949     void *opaque;
 950 } OCFData;
 951
 952 static void object_class_foreach_tramp(gpointer key, gpointer value,
 953                                        gpointer opaque)
 954 {
 955     OCFData *data = opaque;
 956     TypeImpl *type = value;
 957     ObjectClass *k;
 958
 959     type_initialize(type);
 960     k = type->class;
 961
 962     if (!data->include_abstract && type->abstract) {
 963         return;
 964     }
 965
 966     if (data->implements_type &&
 967         !object_class_dynamic_cast(k, data->implements_type)) {
 968         return;
 969     }
 970
 971     data->fn(k, data->opaque);
 972 }
 973
 974 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 975                           const char *implements_type, bool include_abstract,
 976                           void *opaque)
 977 {
 978     OCFData data = { fn, implements_type, include_abstract, opaque };
 979
 980     enumerating_types = true;
 981     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 982     enumerating_types = false;
 983 }
 984
 985 static int do_object_child_foreach(Object *obj,
 986                                    int (*fn)(Object *child, void *opaque),
 987                                    void *opaque, bool recurse)
 988 {
 989     GHashTableIter iter;
 990     ObjectProperty *prop;
 991     int ret = 0;
 992
 993     g_hash_table_iter_init(&iter, obj->properties);
 994     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
 995         if (object_property_is_child(prop)) {
 996             Object *child = prop->opaque;
 997
 998             ret = fn(child, opaque);
 999             if (ret != 0) {
1000                 break;
1001             }
1002             if (recurse) {
1003                 do_object_child_foreach(child, fn, opaque, true);
1004             }
1005         }
1006     }
1007     return ret;
1008 }
1009
1010 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
1011                          void *opaque)
1012 {
1013     return do_object_child_foreach(obj, fn, opaque, false);
1014 }
1015
1016 int object_child_foreach_recursive(Object *obj,
1017                                    int (*fn)(Object *child, void *opaque),
1018                                    void *opaque)
1019 {
1020     return do_object_child_foreach(obj, fn, opaque, true);
1021 }
1022
1023 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
1024 {
1025     GSList **list = opaque;
1026
1027     *list = g_slist_prepend(*list, klass);
1028 }
1029
1030 GSList *object_class_get_list(const char *implements_type,
1031                               bool include_abstract)
1032 {
1033     GSList *list = NULL;
1034
1035     object_class_foreach(object_class_get_list_tramp,
1036                          implements_type, include_abstract, &list);
1037     return list;
1038 }
1039
1040 static gint object_class_cmp(gconstpointer a, gconstpointer b)
1041 {
1042     return strcasecmp(object_class_get_name((ObjectClass *)a),
1043                       object_class_get_name((ObjectClass *)b));
1044 }
1045
1046 GSList *object_class_get_list_sorted(const char *implements_type,
1047                                      bool include_abstract)
1048 {
1049     return g_slist_sort(object_class_get_list(implements_type, include_abstract),
1050                         object_class_cmp);
1051 }
1052
1053 void object_ref(Object *obj)
1054 {
1055     if (!obj) {
1056         return;
1057     }
1058     atomic_inc(&obj->ref);
1059 }
1060
1061 void object_unref(Object *obj)
1062 {
1063     if (!obj) {
1064         return;
1065     }
1066     g_assert(obj->ref > 0);
1067
1068     /* parent always holds a reference to its children */
1069     if (atomic_fetch_dec(&obj->ref) == 1) {
1070         object_finalize(obj);
1071     }
1072 }
1073
1074 ObjectProperty *
1075 object_property_add(Object *obj, const char *name, const char *type,
1076                     ObjectPropertyAccessor *get,
1077                     ObjectPropertyAccessor *set,
1078                     ObjectPropertyRelease *release,
1079                     void *opaque, Error **errp)
1080 {
1081     ObjectProperty *prop;
1082     size_t name_len = strlen(name);
1083
1084     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
1085         int i;
1086         ObjectProperty *ret;
1087         char *name_no_array = g_strdup(name);
1088
1089         name_no_array[name_len - 3] = '\0';
1090         for (i = 0; ; ++i) {
1091             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
1092
1093             ret = object_property_add(obj, full_name, type, get, set,
1094                                       release, opaque, NULL);
1095             g_free(full_name);
1096             if (ret) {
1097                 break;
1098             }
1099         }
1100         g_free(name_no_array);
1101         return ret;
1102     }
1103
1104     if (object_property_find(obj, name, NULL) != NULL) {
1105         error_setg(errp, "attempt to add duplicate property '%s'"
1106                    " to object (type '%s')", name,
1107                    object_get_typename(obj));
1108         return NULL;
1109     }
1110
1111     prop = g_malloc0(sizeof(*prop));
1112
1113     prop->name = g_strdup(name);
1114     prop->type = g_strdup(type);
1115
1116     prop->get = get;
1117     prop->set = set;
1118     prop->release = release;
1119     prop->opaque = opaque;
1120
1121     g_hash_table_insert(obj->properties, prop->name, prop);
1122     return prop;
1123 }
1124
1125 ObjectProperty *
1126 object_class_property_add(ObjectClass *klass,
1127                           const char *name,
1128                           const char *type,
1129                           ObjectPropertyAccessor *get,
1130                           ObjectPropertyAccessor *set,
1131                           ObjectPropertyRelease *release,
1132                           void *opaque,
1133                           Error **errp)
1134 {
1135     ObjectProperty *prop;
1136
1137     if (object_class_property_find(klass, name, NULL) != NULL) {
1138         error_setg(errp, "attempt to add duplicate property '%s'"
1139                    " to object (type '%s')", name,
1140                    object_class_get_name(klass));
1141         return NULL;
1142     }
1143
1144     prop = g_malloc0(sizeof(*prop));
1145
1146     prop->name = g_strdup(name);
1147     prop->type = g_strdup(type);
1148
1149     prop->get = get;
1150     prop->set = set;
1151     prop->release = release;
1152     prop->opaque = opaque;
1153
1154     g_hash_table_insert(klass->properties, g_strdup(name), prop);
1155
1156     return prop;
1157 }
1158
1159 ObjectProperty *object_property_find(Object *obj, const char *name,
1160                                      Error **errp)
1161 {
1162     ObjectProperty *prop;
1163     ObjectClass *klass = object_get_class(obj);
1164
1165     prop = object_class_property_find(klass, name, NULL);
1166     if (prop) {
1167         return prop;
1168     }
1169
1170     prop = g_hash_table_lookup(obj->properties, name);
1171     if (prop) {
1172         return prop;
1173     }
1174
1175     error_setg(errp, "Property '.%s' not found", name);
1176     return NULL;
1177 }
1178
1179 void object_property_iter_init(ObjectPropertyIterator *iter,
1180                                Object *obj)
1181 {
1182     g_hash_table_iter_init(&iter->iter, obj->properties);
1183     iter->nextclass = object_get_class(obj);
1184 }
1185
1186 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1187 {
1188     gpointer key, val;
1189     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1190         if (!iter->nextclass) {
1191             return NULL;
1192         }
1193         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1194         iter->nextclass = object_class_get_parent(iter->nextclass);
1195     }
1196     return val;
1197 }
1198
1199 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1200                                      ObjectClass *klass)
1201 {
1202     g_hash_table_iter_init(&iter->iter, klass->properties);
1203     iter->nextclass = object_class_get_parent(klass);
1204 }
1205
1206 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1207                                            Error **errp)
1208 {
1209     ObjectProperty *prop;
1210     ObjectClass *parent_klass;
1211
1212     parent_klass = object_class_get_parent(klass);
1213     if (parent_klass) {
1214         prop = object_class_property_find(parent_klass, name, NULL);
1215         if (prop) {
1216             return prop;
1217         }
1218     }
1219
1220     prop = g_hash_table_lookup(klass->properties, name);
1221     if (!prop) {
1222         error_setg(errp, "Property '.%s' not found", name);
1223     }
1224     return prop;
1225 }
1226
1227 void object_property_del(Object *obj, const char *name, Error **errp)
1228 {
1229     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1230
1231     if (!prop) {
1232         error_setg(errp, "Property '.%s' not found", name);
1233         return;
1234     }
1235
1236     if (prop->release) {
1237         prop->release(obj, name, prop->opaque);
1238     }
1239     g_hash_table_remove(obj->properties, name);
1240 }
1241
1242 void object_property_get(Object *obj, Visitor *v, const char *name,
1243                          Error **errp)
1244 {
1245     ObjectProperty *prop = object_property_find(obj, name, errp);
1246     if (prop == NULL) {
1247         return;
1248     }
1249
1250     if (!prop->get) {
1251         error_setg(errp, QERR_PERMISSION_DENIED);
1252     } else {
1253         prop->get(obj, v, name, prop->opaque, errp);
1254     }
1255 }
1256
1257 void object_property_set(Object *obj, Visitor *v, const char *name,
1258                          Error **errp)
1259 {
1260     ObjectProperty *prop = object_property_find(obj, name, errp);
1261     if (prop == NULL) {
1262         return;
1263     }
1264
1265     if (!prop->set) {
1266         error_setg(errp, QERR_PERMISSION_DENIED);
1267     } else {
1268         prop->set(obj, v, name, prop->opaque, errp);
1269     }
1270 }
1271
1272 void object_property_set_str(Object *obj, const char *value,
1273                              const char *name, Error **errp)
1274 {
1275     QString *qstr = qstring_from_str(value);
1276     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1277
1278     qobject_unref(qstr);
1279 }
1280
1281 char *object_property_get_str(Object *obj, const char *name,
1282                               Error **errp)
1283 {
1284     QObject *ret = object_property_get_qobject(obj, name, errp);
1285     char *retval;
1286
1287     if (!ret) {
1288         return NULL;
1289     }
1290
1291     retval = g_strdup(qobject_get_try_str(ret));
1292     if (!retval) {
1293         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1294     }
1295
1296     qobject_unref(ret);
1297     return retval;
1298 }
1299
1300 void object_property_set_link(Object *obj, Object *value,
1301                               const char *name, Error **errp)
1302 {
1303     if (value) {
1304         gchar *path = object_get_canonical_path(value);
1305         object_property_set_str(obj, path, name, errp);
1306         g_free(path);
1307     } else {
1308         object_property_set_str(obj, "", name, errp);
1309     }
1310 }
1311
1312 Object *object_property_get_link(Object *obj, const char *name,
1313                                  Error **errp)
1314 {
1315     char *str = object_property_get_str(obj, name, errp);
1316     Object *target = NULL;
1317
1318     if (str && *str) {
1319         target = object_resolve_path(str, NULL);
1320         if (!target) {
1321             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1322                       "Device '%s' not found", str);
1323         }
1324     }
1325
1326     g_free(str);
1327     return target;
1328 }
1329
1330 void object_property_set_bool(Object *obj, bool value,
1331                               const char *name, Error **errp)
1332 {
1333     QBool *qbool = qbool_from_bool(value);
1334     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1335
1336     qobject_unref(qbool);
1337 }
1338
1339 bool object_property_get_bool(Object *obj, const char *name,
1340                               Error **errp)
1341 {
1342     QObject *ret = object_property_get_qobject(obj, name, errp);
1343     QBool *qbool;
1344     bool retval;
1345
1346     if (!ret) {
1347         return false;
1348     }
1349     qbool = qobject_to(QBool, ret);
1350     if (!qbool) {
1351         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1352         retval = false;
1353     } else {
1354         retval = qbool_get_bool(qbool);
1355     }
1356
1357     qobject_unref(ret);
1358     return retval;
1359 }
1360
1361 void object_property_set_int(Object *obj, int64_t value,
1362                              const char *name, Error **errp)
1363 {
1364     QNum *qnum = qnum_from_int(value);
1365     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1366
1367     qobject_unref(qnum);
1368 }
1369
1370 int64_t object_property_get_int(Object *obj, const char *name,
1371                                 Error **errp)
1372 {
1373     QObject *ret = object_property_get_qobject(obj, name, errp);
1374     QNum *qnum;
1375     int64_t retval;
1376
1377     if (!ret) {
1378         return -1;
1379     }
1380
1381     qnum = qobject_to(QNum, ret);
1382     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1383         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1384         retval = -1;
1385     }
1386
1387     qobject_unref(ret);
1388     return retval;
1389 }
1390
1391 void object_property_set_uint(Object *obj, uint64_t value,
1392                               const char *name, Error **errp)
1393 {
1394     QNum *qnum = qnum_from_uint(value);
1395
1396     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1397     qobject_unref(qnum);
1398 }
1399
1400 uint64_t object_property_get_uint(Object *obj, const char *name,
1401                                   Error **errp)
1402 {
1403     QObject *ret = object_property_get_qobject(obj, name, errp);
1404     QNum *qnum;
1405     uint64_t retval;
1406
1407     if (!ret) {
1408         return 0;
1409     }
1410     qnum = qobject_to(QNum, ret);
1411     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1412         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1413         retval = 0;
1414     }
1415
1416     qobject_unref(ret);
1417     return retval;
1418 }
1419
1420 typedef struct EnumProperty {
1421     const QEnumLookup *lookup;
1422     int (*get)(Object *, Error **);
1423     void (*set)(Object *, int, Error **);
1424 } EnumProperty;
1425
1426 int object_property_get_enum(Object *obj, const char *name,
1427                              const char *typename, Error **errp)
1428 {
1429     Error *err = NULL;
1430     Visitor *v;
1431     char *str;
1432     int ret;
1433     ObjectProperty *prop = object_property_find(obj, name, errp);
1434     EnumProperty *enumprop;
1435
1436     if (prop == NULL) {
1437         return 0;
1438     }
1439
1440     if (!g_str_equal(prop->type, typename)) {
1441         error_setg(errp, "Property %s on %s is not '%s' enum type",
1442                    name, object_class_get_name(
1443                        object_get_class(obj)), typename);
1444         return 0;
1445     }
1446
1447     enumprop = prop->opaque;
1448
1449     v = string_output_visitor_new(false, &str);
1450     object_property_get(obj, v, name, &err);
1451     if (err) {
1452         error_propagate(errp, err);
1453         visit_free(v);
1454         return 0;
1455     }
1456     visit_complete(v, &str);
1457     visit_free(v);
1458     v = string_input_visitor_new(str);
1459     visit_type_enum(v, name, &ret, enumprop->lookup, errp);
1460
1461     g_free(str);
1462     visit_free(v);
1463
1464     return ret;
1465 }
1466
1467 void object_property_get_uint16List(Object *obj, const char *name,
1468                                     uint16List **list, Error **errp)
1469 {
1470     Error *err = NULL;
1471     Visitor *v;
1472     char *str;
1473
1474     v = string_output_visitor_new(false, &str);
1475     object_property_get(obj, v, name, &err);
1476     if (err) {
1477         error_propagate(errp, err);
1478         goto out;
1479     }
1480     visit_complete(v, &str);
1481     visit_free(v);
1482     v = string_input_visitor_new(str);
1483     visit_type_uint16List(v, NULL, list, errp);
1484
1485     g_free(str);
1486 out:
1487     visit_free(v);
1488 }
1489
1490 void object_property_parse(Object *obj, const char *string,
1491                            const char *name, Error **errp)
1492 {
1493     Visitor *v = string_input_visitor_new(string);
1494     object_property_set(obj, v, name, errp);
1495     visit_free(v);
1496 }
1497
1498 char *object_property_print(Object *obj, const char *name, bool human,
1499                             Error **errp)
1500 {
1501     Visitor *v;
1502     char *string = NULL;
1503     Error *local_err = NULL;
1504
1505     v = string_output_visitor_new(human, &string);
1506     object_property_get(obj, v, name, &local_err);
1507     if (local_err) {
1508         error_propagate(errp, local_err);
1509         goto out;
1510     }
1511
1512     visit_complete(v, &string);
1513
1514 out:
1515     visit_free(v);
1516     return string;
1517 }
1518
1519 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1520 {
1521     ObjectProperty *prop = object_property_find(obj, name, errp);
1522     if (prop == NULL) {
1523         return NULL;
1524     }
1525
1526     return prop->type;
1527 }
1528
1529 Object *object_get_root(void)
1530 {
1531     static Object *root;
1532
1533     if (!root) {
1534         root = object_new("container");
1535     }
1536
1537     return root;
1538 }
1539
1540 Object *object_get_objects_root(void)
1541 {
1542     return container_get(object_get_root(), "/objects");
1543 }
1544
1545 Object *object_get_internal_root(void)
1546 {
1547     static Object *internal_root;
1548
1549     if (!internal_root) {
1550         internal_root = object_new("container");
1551     }
1552
1553     return internal_root;
1554 }
1555
1556 static void object_get_child_property(Object *obj, Visitor *v,
1557                                       const char *name, void *opaque,
1558                                       Error **errp)
1559 {
1560     Object *child = opaque;
1561     gchar *path;
1562
1563     path = object_get_canonical_path(child);
1564     visit_type_str(v, name, &path, errp);
1565     g_free(path);
1566 }
1567
1568 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1569 {
1570     return opaque;
1571 }
1572
1573 static void object_finalize_child_property(Object *obj, const char *name,
1574                                            void *opaque)
1575 {
1576     Object *child = opaque;
1577
1578     if (child->class->unparent) {
1579         (child->class->unparent)(child);
1580     }
1581     child->parent = NULL;
1582     object_unref(child);
1583 }
1584
1585 void object_property_add_child(Object *obj, const char *name,
1586                                Object *child, Error **errp)
1587 {
1588     Error *local_err = NULL;
1589     gchar *type;
1590     ObjectProperty *op;
1591
1592     if (child->parent != NULL) {
1593         error_setg(errp, "child object is already parented");
1594         return;
1595     }
1596
1597     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1598
1599     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1600                              object_finalize_child_property, child, &local_err);
1601     if (local_err) {
1602         error_propagate(errp, local_err);
1603         goto out;
1604     }
1605
1606     op->resolve = object_resolve_child_property;
1607     object_ref(child);
1608     child->parent = obj;
1609
1610 out:
1611     g_free(type);
1612 }
1613
1614 void object_property_allow_set_link(const Object *obj, const char *name,
1615                                     Object *val, Error **errp)
1616 {
1617     /* Allow the link to be set, always */
1618 }
1619
1620 typedef struct {
1621     Object **child;
1622     void (*check)(const Object *, const char *, Object *, Error **);
1623     ObjectPropertyLinkFlags flags;
1624 } LinkProperty;
1625
1626 static void object_get_link_property(Object *obj, Visitor *v,
1627                                      const char *name, void *opaque,
1628                                      Error **errp)
1629 {
1630     LinkProperty *lprop = opaque;
1631     Object **child = lprop->child;
1632     gchar *path;
1633
1634     if (*child) {
1635         path = object_get_canonical_path(*child);
1636         visit_type_str(v, name, &path, errp);
1637         g_free(path);
1638     } else {
1639         path = (gchar *)"";
1640         visit_type_str(v, name, &path, errp);
1641     }
1642 }
1643
1644 /*
1645  * object_resolve_link:
1646  *
1647  * Lookup an object and ensure its type matches the link property type.  This
1648  * is similar to object_resolve_path() except type verification against the
1649  * link property is performed.
1650  *
1651  * Returns: The matched object or NULL on path lookup failures.
1652  */
1653 static Object *object_resolve_link(Object *obj, const char *name,
1654                                    const char *path, Error **errp)
1655 {
1656     const char *type;
1657     gchar *target_type;
1658     bool ambiguous = false;
1659     Object *target;
1660
1661     /* Go from link<FOO> to FOO.  */
1662     type = object_property_get_type(obj, name, NULL);
1663     target_type = g_strndup(&type[5], strlen(type) - 6);
1664     target = object_resolve_path_type(path, target_type, &ambiguous);
1665
1666     if (ambiguous) {
1667         error_setg(errp, "Path '%s' does not uniquely identify an object",
1668                    path);
1669     } else if (!target) {
1670         target = object_resolve_path(path, &ambiguous);
1671         if (target || ambiguous) {
1672             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1673         } else {
1674             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1675                       "Device '%s' not found", path);
1676         }
1677         target = NULL;
1678     }
1679     g_free(target_type);
1680
1681     return target;
1682 }
1683
1684 static void object_set_link_property(Object *obj, Visitor *v,
1685                                      const char *name, void *opaque,
1686                                      Error **errp)
1687 {
1688     Error *local_err = NULL;
1689     LinkProperty *prop = opaque;
1690     Object **child = prop->child;
1691     Object *old_target = *child;
1692     Object *new_target = NULL;
1693     char *path = NULL;
1694
1695     visit_type_str(v, name, &path, &local_err);
1696
1697     if (!local_err && strcmp(path, "") != 0) {
1698         new_target = object_resolve_link(obj, name, path, &local_err);
1699     }
1700
1701     g_free(path);
1702     if (local_err) {
1703         error_propagate(errp, local_err);
1704         return;
1705     }
1706
1707     prop->check(obj, name, new_target, &local_err);
1708     if (local_err) {
1709         error_propagate(errp, local_err);
1710         return;
1711     }
1712
1713     *child = new_target;
1714     if (prop->flags == OBJ_PROP_LINK_STRONG) {
1715         object_ref(new_target);
1716         object_unref(old_target);
1717     }
1718 }
1719
1720 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1721 {
1722     LinkProperty *lprop = opaque;
1723
1724     return *lprop->child;
1725 }
1726
1727 static void object_release_link_property(Object *obj, const char *name,
1728                                          void *opaque)
1729 {
1730     LinkProperty *prop = opaque;
1731
1732     if ((prop->flags & OBJ_PROP_LINK_STRONG) && *prop->child) {
1733         object_unref(*prop->child);
1734     }
1735     g_free(prop);
1736 }
1737
1738 void object_property_add_link(Object *obj, const char *name,
1739                               const char *type, Object **child,
1740                               void (*check)(const Object *, const char *,
1741                                             Object *, Error **),
1742                               ObjectPropertyLinkFlags flags,
1743                               Error **errp)
1744 {
1745     Error *local_err = NULL;
1746     LinkProperty *prop = g_malloc(sizeof(*prop));
1747     gchar *full_type;
1748     ObjectProperty *op;
1749
1750     prop->child = child;
1751     prop->check = check;
1752     prop->flags = flags;
1753
1754     full_type = g_strdup_printf("link<%s>", type);
1755
1756     op = object_property_add(obj, name, full_type,
1757                              object_get_link_property,
1758                              check ? object_set_link_property : NULL,
1759                              object_release_link_property,
1760                              prop,
1761                              &local_err);
1762     if (local_err) {
1763         error_propagate(errp, local_err);
1764         g_free(prop);
1765         goto out;
1766     }
1767
1768     op->resolve = object_resolve_link_property;
1769
1770 out:
1771     g_free(full_type);
1772 }
1773
1774 void object_property_add_const_link(Object *obj, const char *name,
1775                                     Object *target, Error **errp)
1776 {
1777     char *link_type;
1778     ObjectProperty *op;
1779
1780     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1781     op = object_property_add(obj, name, link_type,
1782                              object_get_child_property, NULL,
1783                              NULL, target, errp);
1784     if (op != NULL) {
1785         op->resolve = object_resolve_child_property;
1786     }
1787     g_free(link_type);
1788 }
1789
1790 gchar *object_get_canonical_path_component(Object *obj)
1791 {
1792     ObjectProperty *prop = NULL;
1793     GHashTableIter iter;
1794
1795     if (obj->parent == NULL) {
1796         return NULL;
1797     }
1798
1799     g_hash_table_iter_init(&iter, obj->parent->properties);
1800     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1801         if (!object_property_is_child(prop)) {
1802             continue;
1803         }
1804
1805         if (prop->opaque == obj) {
1806             return g_strdup(prop->name);
1807         }
1808     }
1809
1810     /* obj had a parent but was not a child, should never happen */
1811     g_assert_not_reached();
1812     return NULL;
1813 }
1814
1815 gchar *object_get_canonical_path(Object *obj)
1816 {
1817     Object *root = object_get_root();
1818     char *newpath, *path = NULL;
1819
1820     if (obj == root) {
1821         return g_strdup("/");
1822     }
1823
1824     do {
1825         char *component = object_get_canonical_path_component(obj);
1826
1827         if (!component) {
1828             /* A canonical path must be complete, so discard what was
1829              * collected so far.
1830              */
1831             g_free(path);
1832             return NULL;
1833         }
1834
1835         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
1836         g_free(path);
1837         g_free(component);
1838         path = newpath;
1839         obj = obj->parent;
1840     } while (obj != root);
1841
1842     return path;
1843 }
1844
1845 Object *object_resolve_path_component(Object *parent, const gchar *part)
1846 {
1847     ObjectProperty *prop = object_property_find(parent, part, NULL);
1848     if (prop == NULL) {
1849         return NULL;
1850     }
1851
1852     if (prop->resolve) {
1853         return prop->resolve(parent, prop->opaque, part);
1854     } else {
1855         return NULL;
1856     }
1857 }
1858
1859 static Object *object_resolve_abs_path(Object *parent,
1860                                           gchar **parts,
1861                                           const char *typename,
1862                                           int index)
1863 {
1864     Object *child;
1865
1866     if (parts[index] == NULL) {
1867         return object_dynamic_cast(parent, typename);
1868     }
1869
1870     if (strcmp(parts[index], "") == 0) {
1871         return object_resolve_abs_path(parent, parts, typename, index + 1);
1872     }
1873
1874     child = object_resolve_path_component(parent, parts[index]);
1875     if (!child) {
1876         return NULL;
1877     }
1878
1879     return object_resolve_abs_path(child, parts, typename, index + 1);
1880 }
1881
1882 static Object *object_resolve_partial_path(Object *parent,
1883                                               gchar **parts,
1884                                               const char *typename,
1885                                               bool *ambiguous)
1886 {
1887     Object *obj;
1888     GHashTableIter iter;
1889     ObjectProperty *prop;
1890
1891     obj = object_resolve_abs_path(parent, parts, typename, 0);
1892
1893     g_hash_table_iter_init(&iter, parent->properties);
1894     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1895         Object *found;
1896
1897         if (!object_property_is_child(prop)) {
1898             continue;
1899         }
1900
1901         found = object_resolve_partial_path(prop->opaque, parts,
1902                                             typename, ambiguous);
1903         if (found) {
1904             if (obj) {
1905                 *ambiguous = true;
1906                 return NULL;
1907             }
1908             obj = found;
1909         }
1910
1911         if (*ambiguous) {
1912             return NULL;
1913         }
1914     }
1915
1916     return obj;
1917 }
1918
1919 Object *object_resolve_path_type(const char *path, const char *typename,
1920                                  bool *ambiguousp)
1921 {
1922     Object *obj;
1923     gchar **parts;
1924
1925     parts = g_strsplit(path, "/", 0);
1926     assert(parts);
1927
1928     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1929         bool ambiguous = false;
1930         obj = object_resolve_partial_path(object_get_root(), parts,
1931                                           typename, &ambiguous);
1932         if (ambiguousp) {
1933             *ambiguousp = ambiguous;
1934         }
1935     } else {
1936         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1937     }
1938
1939     g_strfreev(parts);
1940
1941     return obj;
1942 }
1943
1944 Object *object_resolve_path(const char *path, bool *ambiguous)
1945 {
1946     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1947 }
1948
1949 typedef struct StringProperty
1950 {
1951     char *(*get)(Object *, Error **);
1952     void (*set)(Object *, const char *, Error **);
1953 } StringProperty;
1954
1955 static void property_get_str(Object *obj, Visitor *v, const char *name,
1956                              void *opaque, Error **errp)
1957 {
1958     StringProperty *prop = opaque;
1959     char *value;
1960     Error *err = NULL;
1961
1962     value = prop->get(obj, &err);
1963     if (err) {
1964         error_propagate(errp, err);
1965         return;
1966     }
1967
1968     visit_type_str(v, name, &value, errp);
1969     g_free(value);
1970 }
1971
1972 static void property_set_str(Object *obj, Visitor *v, const char *name,
1973                              void *opaque, Error **errp)
1974 {
1975     StringProperty *prop = opaque;
1976     char *value;
1977     Error *local_err = NULL;
1978
1979     visit_type_str(v, name, &value, &local_err);
1980     if (local_err) {
1981         error_propagate(errp, local_err);
1982         return;
1983     }
1984
1985     prop->set(obj, value, errp);
1986     g_free(value);
1987 }
1988
1989 static void property_release_str(Object *obj, const char *name,
1990                                  void *opaque)
1991 {
1992     StringProperty *prop = opaque;
1993     g_free(prop);
1994 }
1995
1996 void object_property_add_str(Object *obj, const char *name,
1997                            char *(*get)(Object *, Error **),
1998                            void (*set)(Object *, const char *, Error **),
1999                            Error **errp)
2000 {
2001     Error *local_err = NULL;
2002     StringProperty *prop = g_malloc0(sizeof(*prop));
2003
2004     prop->get = get;
2005     prop->set = set;
2006
2007     object_property_add(obj, name, "string",
2008                         get ? property_get_str : NULL,
2009                         set ? property_set_str : NULL,
2010                         property_release_str,
2011                         prop, &local_err);
2012     if (local_err) {
2013         error_propagate(errp, local_err);
2014         g_free(prop);
2015     }
2016 }
2017
2018 void object_class_property_add_str(ObjectClass *klass, const char *name,
2019                                    char *(*get)(Object *, Error **),
2020                                    void (*set)(Object *, const char *,
2021                                                Error **),
2022                                    Error **errp)
2023 {
2024     Error *local_err = NULL;
2025     StringProperty *prop = g_malloc0(sizeof(*prop));
2026
2027     prop->get = get;
2028     prop->set = set;
2029
2030     object_class_property_add(klass, name, "string",
2031                               get ? property_get_str : NULL,
2032                               set ? property_set_str : NULL,
2033                               property_release_str,
2034                               prop, &local_err);
2035     if (local_err) {
2036         error_propagate(errp, local_err);
2037         g_free(prop);
2038     }
2039 }
2040
2041 typedef struct BoolProperty
2042 {
2043     bool (*get)(Object *, Error **);
2044     void (*set)(Object *, bool, Error **);
2045 } BoolProperty;
2046
2047 static void property_get_bool(Object *obj, Visitor *v, const char *name,
2048                               void *opaque, Error **errp)
2049 {
2050     BoolProperty *prop = opaque;
2051     bool value;
2052     Error *err = NULL;
2053
2054     value = prop->get(obj, &err);
2055     if (err) {
2056         error_propagate(errp, err);
2057         return;
2058     }
2059
2060     visit_type_bool(v, name, &value, errp);
2061 }
2062
2063 static void property_set_bool(Object *obj, Visitor *v, const char *name,
2064                               void *opaque, Error **errp)
2065 {
2066     BoolProperty *prop = opaque;
2067     bool value;
2068     Error *local_err = NULL;
2069
2070     visit_type_bool(v, name, &value, &local_err);
2071     if (local_err) {
2072         error_propagate(errp, local_err);
2073         return;
2074     }
2075
2076     prop->set(obj, value, errp);
2077 }
2078
2079 static void property_release_bool(Object *obj, const char *name,
2080                                   void *opaque)
2081 {
2082     BoolProperty *prop = opaque;
2083     g_free(prop);
2084 }
2085
2086 void object_property_add_bool(Object *obj, const char *name,
2087                               bool (*get)(Object *, Error **),
2088                               void (*set)(Object *, bool, Error **),
2089                               Error **errp)
2090 {
2091     Error *local_err = NULL;
2092     BoolProperty *prop = g_malloc0(sizeof(*prop));
2093
2094     prop->get = get;
2095     prop->set = set;
2096
2097     object_property_add(obj, name, "bool",
2098                         get ? property_get_bool : NULL,
2099                         set ? property_set_bool : NULL,
2100                         property_release_bool,
2101                         prop, &local_err);
2102     if (local_err) {
2103         error_propagate(errp, local_err);
2104         g_free(prop);
2105     }
2106 }
2107
2108 void object_class_property_add_bool(ObjectClass *klass, const char *name,
2109                                     bool (*get)(Object *, Error **),
2110                                     void (*set)(Object *, bool, Error **),
2111                                     Error **errp)
2112 {
2113     Error *local_err = NULL;
2114     BoolProperty *prop = g_malloc0(sizeof(*prop));
2115
2116     prop->get = get;
2117     prop->set = set;
2118
2119     object_class_property_add(klass, name, "bool",
2120                               get ? property_get_bool : NULL,
2121                               set ? property_set_bool : NULL,
2122                               property_release_bool,
2123                               prop, &local_err);
2124     if (local_err) {
2125         error_propagate(errp, local_err);
2126         g_free(prop);
2127     }
2128 }
2129
2130 static void property_get_enum(Object *obj, Visitor *v, const char *name,
2131                               void *opaque, Error **errp)
2132 {
2133     EnumProperty *prop = opaque;
2134     int value;
2135     Error *err = NULL;
2136
2137     value = prop->get(obj, &err);
2138     if (err) {
2139         error_propagate(errp, err);
2140         return;
2141     }
2142
2143     visit_type_enum(v, name, &value, prop->lookup, errp);
2144 }
2145
2146 static void property_set_enum(Object *obj, Visitor *v, const char *name,
2147                               void *opaque, Error **errp)
2148 {
2149     EnumProperty *prop = opaque;
2150     int value;
2151     Error *err = NULL;
2152
2153     visit_type_enum(v, name, &value, prop->lookup, &err);
2154     if (err) {
2155         error_propagate(errp, err);
2156         return;
2157     }
2158     prop->set(obj, value, errp);
2159 }
2160
2161 static void property_release_enum(Object *obj, const char *name,
2162                                   void *opaque)
2163 {
2164     EnumProperty *prop = opaque;
2165     g_free(prop);
2166 }
2167
2168 void object_property_add_enum(Object *obj, const char *name,
2169                               const char *typename,
2170                               const QEnumLookup *lookup,
2171                               int (*get)(Object *, Error **),
2172                               void (*set)(Object *, int, Error **),
2173                               Error **errp)
2174 {
2175     Error *local_err = NULL;
2176     EnumProperty *prop = g_malloc(sizeof(*prop));
2177
2178     prop->lookup = lookup;
2179     prop->get = get;
2180     prop->set = set;
2181
2182     object_property_add(obj, name, typename,
2183                         get ? property_get_enum : NULL,
2184                         set ? property_set_enum : NULL,
2185                         property_release_enum,
2186                         prop, &local_err);
2187     if (local_err) {
2188         error_propagate(errp, local_err);
2189         g_free(prop);
2190     }
2191 }
2192
2193 void object_class_property_add_enum(ObjectClass *klass, const char *name,
2194                                     const char *typename,
2195                                     const QEnumLookup *lookup,
2196                                     int (*get)(Object *, Error **),
2197                                     void (*set)(Object *, int, Error **),
2198                                     Error **errp)
2199 {
2200     Error *local_err = NULL;
2201     EnumProperty *prop = g_malloc(sizeof(*prop));
2202
2203     prop->lookup = lookup;
2204     prop->get = get;
2205     prop->set = set;
2206
2207     object_class_property_add(klass, name, typename,
2208                               get ? property_get_enum : NULL,
2209                               set ? property_set_enum : NULL,
2210                               property_release_enum,
2211                               prop, &local_err);
2212     if (local_err) {
2213         error_propagate(errp, local_err);
2214         g_free(prop);
2215     }
2216 }
2217
2218 typedef struct TMProperty {
2219     void (*get)(Object *, struct tm *, Error **);
2220 } TMProperty;
2221
2222 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2223                             void *opaque, Error **errp)
2224 {
2225     TMProperty *prop = opaque;
2226     Error *err = NULL;
2227     struct tm value;
2228
2229     prop->get(obj, &value, &err);
2230     if (err) {
2231         goto out;
2232     }
2233
2234     visit_start_struct(v, name, NULL, 0, &err);
2235     if (err) {
2236         goto out;
2237     }
2238     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2239     if (err) {
2240         goto out_end;
2241     }
2242     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2243     if (err) {
2244         goto out_end;
2245     }
2246     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2247     if (err) {
2248         goto out_end;
2249     }
2250     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2251     if (err) {
2252         goto out_end;
2253     }
2254     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2255     if (err) {
2256         goto out_end;
2257     }
2258     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2259     if (err) {
2260         goto out_end;
2261     }
2262     visit_check_struct(v, &err);
2263 out_end:
2264     visit_end_struct(v, NULL);
2265 out:
2266     error_propagate(errp, err);
2267
2268 }
2269
2270 static void property_release_tm(Object *obj, const char *name,
2271                                 void *opaque)
2272 {
2273     TMProperty *prop = opaque;
2274     g_free(prop);
2275 }
2276
2277 void object_property_add_tm(Object *obj, const char *name,
2278                             void (*get)(Object *, struct tm *, Error **),
2279                             Error **errp)
2280 {
2281     Error *local_err = NULL;
2282     TMProperty *prop = g_malloc0(sizeof(*prop));
2283
2284     prop->get = get;
2285
2286     object_property_add(obj, name, "struct tm",
2287                         get ? property_get_tm : NULL, NULL,
2288                         property_release_tm,
2289                         prop, &local_err);
2290     if (local_err) {
2291         error_propagate(errp, local_err);
2292         g_free(prop);
2293     }
2294 }
2295
2296 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2297                                   void (*get)(Object *, struct tm *, Error **),
2298                                   Error **errp)
2299 {
2300     Error *local_err = NULL;
2301     TMProperty *prop = g_malloc0(sizeof(*prop));
2302
2303     prop->get = get;
2304
2305     object_class_property_add(klass, name, "struct tm",
2306                               get ? property_get_tm : NULL, NULL,
2307                               property_release_tm,
2308                               prop, &local_err);
2309     if (local_err) {
2310         error_propagate(errp, local_err);
2311         g_free(prop);
2312     }
2313 }
2314
2315 static char *qdev_get_type(Object *obj, Error **errp)
2316 {
2317     return g_strdup(object_get_typename(obj));
2318 }
2319
2320 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2321                                    void *opaque, Error **errp)
2322 {
2323     uint8_t value = *(uint8_t *)opaque;
2324     visit_type_uint8(v, name, &value, errp);
2325 }
2326
2327 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2328                                     void *opaque, Error **errp)
2329 {
2330     uint16_t value = *(uint16_t *)opaque;
2331     visit_type_uint16(v, name, &value, errp);
2332 }
2333
2334 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2335                                     void *opaque, Error **errp)
2336 {
2337     uint32_t value = *(uint32_t *)opaque;
2338     visit_type_uint32(v, name, &value, errp);
2339 }
2340
2341 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2342                                     void *opaque, Error **errp)
2343 {
2344     uint64_t value = *(uint64_t *)opaque;
2345     visit_type_uint64(v, name, &value, errp);
2346 }
2347
2348 void object_property_add_uint8_ptr(Object *obj, const char *name,
2349                                    const uint8_t *v, Error **errp)
2350 {
2351     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2352                         NULL, NULL, (void *)v, errp);
2353 }
2354
2355 void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2356                                          const uint8_t *v, Error **errp)
2357 {
2358     object_class_property_add(klass, name, "uint8", property_get_uint8_ptr,
2359                               NULL, NULL, (void *)v, errp);
2360 }
2361
2362 void object_property_add_uint16_ptr(Object *obj, const char *name,
2363                                     const uint16_t *v, Error **errp)
2364 {
2365     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2366                         NULL, NULL, (void *)v, errp);
2367 }
2368
2369 void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2370                                           const uint16_t *v, Error **errp)
2371 {
2372     object_class_property_add(klass, name, "uint16", property_get_uint16_ptr,
2373                               NULL, NULL, (void *)v, errp);
2374 }
2375
2376 void object_property_add_uint32_ptr(Object *obj, const char *name,
2377                                     const uint32_t *v, Error **errp)
2378 {
2379     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2380                         NULL, NULL, (void *)v, errp);
2381 }
2382
2383 void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2384                                           const uint32_t *v, Error **errp)
2385 {
2386     object_class_property_add(klass, name, "uint32", property_get_uint32_ptr,
2387                               NULL, NULL, (void *)v, errp);
2388 }
2389
2390 void object_property_add_uint64_ptr(Object *obj, const char *name,
2391                                     const uint64_t *v, Error **errp)
2392 {
2393     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2394                         NULL, NULL, (void *)v, errp);
2395 }
2396
2397 void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2398                                           const uint64_t *v, Error **errp)
2399 {
2400     object_class_property_add(klass, name, "uint64", property_get_uint64_ptr,
2401                               NULL, NULL, (void *)v, errp);
2402 }
2403
2404 typedef struct {
2405     Object *target_obj;
2406     char *target_name;
2407 } AliasProperty;
2408
2409 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2410                                void *opaque, Error **errp)
2411 {
2412     AliasProperty *prop = opaque;
2413
2414     object_property_get(prop->target_obj, v, prop->target_name, errp);
2415 }
2416
2417 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2418                                void *opaque, Error **errp)
2419 {
2420     AliasProperty *prop = opaque;
2421
2422     object_property_set(prop->target_obj, v, prop->target_name, errp);
2423 }
2424
2425 static Object *property_resolve_alias(Object *obj, void *opaque,
2426                                       const gchar *part)
2427 {
2428     AliasProperty *prop = opaque;
2429
2430     return object_resolve_path_component(prop->target_obj, prop->target_name);
2431 }
2432
2433 static void property_release_alias(Object *obj, const char *name, void *opaque)
2434 {
2435     AliasProperty *prop = opaque;
2436
2437     g_free(prop->target_name);
2438     g_free(prop);
2439 }
2440
2441 void object_property_add_alias(Object *obj, const char *name,
2442                                Object *target_obj, const char *target_name,
2443                                Error **errp)
2444 {
2445     AliasProperty *prop;
2446     ObjectProperty *op;
2447     ObjectProperty *target_prop;
2448     gchar *prop_type;
2449     Error *local_err = NULL;
2450
2451     target_prop = object_property_find(target_obj, target_name, errp);
2452     if (!target_prop) {
2453         return;
2454     }
2455
2456     if (object_property_is_child(target_prop)) {
2457         prop_type = g_strdup_printf("link%s",
2458                                     target_prop->type + strlen("child"));
2459     } else {
2460         prop_type = g_strdup(target_prop->type);
2461     }
2462
2463     prop = g_malloc(sizeof(*prop));
2464     prop->target_obj = target_obj;
2465     prop->target_name = g_strdup(target_name);
2466
2467     op = object_property_add(obj, name, prop_type,
2468                              property_get_alias,
2469                              property_set_alias,
2470                              property_release_alias,
2471                              prop, &local_err);
2472     if (local_err) {
2473         error_propagate(errp, local_err);
2474         g_free(prop);
2475         goto out;
2476     }
2477     op->resolve = property_resolve_alias;
2478
2479     object_property_set_description(obj, op->name,
2480                                     target_prop->description,
2481                                     &error_abort);
2482
2483 out:
2484     g_free(prop_type);
2485 }
2486
2487 void object_property_set_description(Object *obj, const char *name,
2488                                      const char *description, Error **errp)
2489 {
2490     ObjectProperty *op;
2491
2492     op = object_property_find(obj, name, errp);
2493     if (!op) {
2494         return;
2495     }
2496
2497     g_free(op->description);
2498     op->description = g_strdup(description);
2499 }
2500
2501 void object_class_property_set_description(ObjectClass *klass,
2502                                            const char *name,
2503                                            const char *description,
2504                                            Error **errp)
2505 {
2506     ObjectProperty *op;
2507
2508     op = g_hash_table_lookup(klass->properties, name);
2509     if (!op) {
2510         error_setg(errp, "Property '.%s' not found", name);
2511         return;
2512     }
2513
2514     g_free(op->description);
2515     op->description = g_strdup(description);
2516 }
2517
2518 static void object_class_init(ObjectClass *klass, void *data)
2519 {
2520     object_class_property_add_str(klass, "type", qdev_get_type,
2521                                   NULL, &error_abort);
2522 }
2523
2524 static void register_types(void)
2525 {
2526     static TypeInfo interface_info = {
2527         .name = TYPE_INTERFACE,
2528         .class_size = sizeof(InterfaceClass),
2529         .abstract = true,
2530     };
2531
2532     static TypeInfo object_info = {
2533         .name = TYPE_OBJECT,
2534         .instance_size = sizeof(Object),
2535         .class_init = object_class_init,
2536         .abstract = true,
2537     };
2538
2539     type_interface = type_register_internal(&interface_info);
2540     type_register_internal(&object_info);
2541 }
2542
2543 type_init(register_types)