qom/object.c

   1 /*
   2  * QEMU Object Model
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "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         if (p->optional && !object_property_find(obj, p->property, NULL)) {
 389             continue;
 390         }
 391         p->used = true;
 392         object_property_parse(obj, p->value, p->property, &err);
 393         if (err != NULL) {
 394             error_prepend(&err, "can't apply global %s.%s=%s: ",
 395                           p->driver, p->property, p->value);
 396             /*
 397              * If errp != NULL, propagate error and return.
 398              * If errp == NULL, report a warning, but keep going
 399              * with the remaining globals.
 400              */
 401             if (errp) {
 402                 error_propagate(errp, err);
 403                 return;
 404             } else {
 405                 warn_report_err(err);
 406             }
 407         }
 408     }
 409 }
 410
 411 /*
 412  * Global property defaults
 413  * Slot 0: accelerator's global property defaults
 414  * Slot 1: machine's global property defaults
 415  * Each is a GPtrArray of of GlobalProperty.
 416  * Applied in order, later entries override earlier ones.
 417  */
 418 static GPtrArray *object_compat_props[2];
 419
 420 /*
 421  * Set machine's global property defaults to @compat_props.
 422  * May be called at most once.
 423  */
 424 void object_set_machine_compat_props(GPtrArray *compat_props)
 425 {
 426     assert(!object_compat_props[1]);
 427     object_compat_props[1] = compat_props;
 428 }
 429
 430 /*
 431  * Set accelerator's global property defaults to @compat_props.
 432  * May be called at most once.
 433  */
 434 void object_set_accelerator_compat_props(GPtrArray *compat_props)
 435 {
 436     assert(!object_compat_props[0]);
 437     object_compat_props[0] = compat_props;
 438 }
 439
 440 void object_apply_compat_props(Object *obj)
 441 {
 442     int i;
 443
 444     for (i = 0; i < ARRAY_SIZE(object_compat_props); i++) {
 445         object_apply_global_props(obj, object_compat_props[i],
 446                                   &error_abort);
 447     }
 448 }
 449
 450 static void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 451 {
 452     Object *obj = data;
 453
 454     g_assert(type != NULL);
 455     type_initialize(type);
 456
 457     g_assert(type->instance_size >= sizeof(Object));
 458     g_assert(type->abstract == false);
 459     g_assert(size >= type->instance_size);
 460
 461     memset(obj, 0, type->instance_size);
 462     obj->class = type->class;
 463     object_ref(obj);
 464     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 465                                             NULL, object_property_free);
 466     object_init_with_type(obj, type);
 467     object_post_init_with_type(obj, type);
 468 }
 469
 470 void object_initialize(void *data, size_t size, const char *typename)
 471 {
 472     TypeImpl *type = type_get_by_name(typename);
 473
 474     object_initialize_with_type(data, size, type);
 475 }
 476
 477 void object_initialize_child(Object *parentobj, const char *propname,
 478                              void *childobj, size_t size, const char *type,
 479                              Error **errp, ...)
 480 {
 481     va_list vargs;
 482
 483     va_start(vargs, errp);
 484     object_initialize_childv(parentobj, propname, childobj, size, type, errp,
 485                              vargs);
 486     va_end(vargs);
 487 }
 488
 489 void object_initialize_childv(Object *parentobj, const char *propname,
 490                               void *childobj, size_t size, const char *type,
 491                               Error **errp, va_list vargs)
 492 {
 493     Error *local_err = NULL;
 494     Object *obj;
 495     UserCreatable *uc;
 496
 497     object_initialize(childobj, size, type);
 498     obj = OBJECT(childobj);
 499
 500     object_set_propv(obj, &local_err, vargs);
 501     if (local_err) {
 502         goto out;
 503     }
 504
 505     object_property_add_child(parentobj, propname, obj, &local_err);
 506     if (local_err) {
 507         goto out;
 508     }
 509
 510     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 511     if (uc) {
 512         user_creatable_complete(uc, &local_err);
 513         if (local_err) {
 514             object_unparent(obj);
 515             goto out;
 516         }
 517     }
 518
 519     /*
 520      * Since object_property_add_child added a reference to the child object,
 521      * we can drop the reference added by object_initialize(), so the child
 522      * property will own the only reference to the object.
 523      */
 524     object_unref(obj);
 525
 526 out:
 527     if (local_err) {
 528         error_propagate(errp, local_err);
 529         object_unref(obj);
 530     }
 531 }
 532
 533 static inline bool object_property_is_child(ObjectProperty *prop)
 534 {
 535     return strstart(prop->type, "child<", NULL);
 536 }
 537
 538 static void object_property_del_all(Object *obj)
 539 {
 540     ObjectProperty *prop;
 541     GHashTableIter iter;
 542     gpointer key, value;
 543     bool released;
 544
 545     do {
 546         released = false;
 547         g_hash_table_iter_init(&iter, obj->properties);
 548         while (g_hash_table_iter_next(&iter, &key, &value)) {
 549             prop = value;
 550             if (prop->release) {
 551                 prop->release(obj, prop->name, prop->opaque);
 552                 prop->release = NULL;
 553                 released = true;
 554                 break;
 555             }
 556             g_hash_table_iter_remove(&iter);
 557         }
 558     } while (released);
 559
 560     g_hash_table_unref(obj->properties);
 561 }
 562
 563 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 564 {
 565     ObjectProperty *prop;
 566     GHashTableIter iter;
 567     gpointer key, value;
 568
 569     g_hash_table_iter_init(&iter, obj->properties);
 570     while (g_hash_table_iter_next(&iter, &key, &value)) {
 571         prop = value;
 572         if (object_property_is_child(prop) && prop->opaque == child) {
 573             if (prop->release) {
 574                 prop->release(obj, prop->name, prop->opaque);
 575                 prop->release = NULL;
 576             }
 577             break;
 578         }
 579     }
 580     g_hash_table_iter_init(&iter, obj->properties);
 581     while (g_hash_table_iter_next(&iter, &key, &value)) {
 582         prop = value;
 583         if (object_property_is_child(prop) && prop->opaque == child) {
 584             g_hash_table_iter_remove(&iter);
 585             break;
 586         }
 587     }
 588 }
 589
 590 void object_unparent(Object *obj)
 591 {
 592     if (obj->parent) {
 593         object_property_del_child(obj->parent, obj, NULL);
 594     }
 595 }
 596
 597 static void object_deinit(Object *obj, TypeImpl *type)
 598 {
 599     if (type->instance_finalize) {
 600         type->instance_finalize(obj);
 601     }
 602
 603     if (type_has_parent(type)) {
 604         object_deinit(obj, type_get_parent(type));
 605     }
 606 }
 607
 608 static void object_finalize(void *data)
 609 {
 610     Object *obj = data;
 611     TypeImpl *ti = obj->class->type;
 612
 613     object_property_del_all(obj);
 614     object_deinit(obj, ti);
 615
 616     g_assert(obj->ref == 0);
 617     if (obj->free) {
 618         obj->free(obj);
 619     }
 620 }
 621
 622 static Object *object_new_with_type(Type type)
 623 {
 624     Object *obj;
 625
 626     g_assert(type != NULL);
 627     type_initialize(type);
 628
 629     obj = g_malloc(type->instance_size);
 630     object_initialize_with_type(obj, type->instance_size, type);
 631     obj->free = g_free;
 632
 633     return obj;
 634 }
 635
 636 Object *object_new(const char *typename)
 637 {
 638     TypeImpl *ti = type_get_by_name(typename);
 639
 640     return object_new_with_type(ti);
 641 }
 642
 643
 644 Object *object_new_with_props(const char *typename,
 645                               Object *parent,
 646                               const char *id,
 647                               Error **errp,
 648                               ...)
 649 {
 650     va_list vargs;
 651     Object *obj;
 652
 653     va_start(vargs, errp);
 654     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 655     va_end(vargs);
 656
 657     return obj;
 658 }
 659
 660
 661 Object *object_new_with_propv(const char *typename,
 662                               Object *parent,
 663                               const char *id,
 664                               Error **errp,
 665                               va_list vargs)
 666 {
 667     Object *obj;
 668     ObjectClass *klass;
 669     Error *local_err = NULL;
 670     UserCreatable *uc;
 671
 672     klass = object_class_by_name(typename);
 673     if (!klass) {
 674         error_setg(errp, "invalid object type: %s", typename);
 675         return NULL;
 676     }
 677
 678     if (object_class_is_abstract(klass)) {
 679         error_setg(errp, "object type '%s' is abstract", typename);
 680         return NULL;
 681     }
 682     obj = object_new(typename);
 683
 684     if (object_set_propv(obj, &local_err, vargs) < 0) {
 685         goto error;
 686     }
 687
 688     if (id != NULL) {
 689         object_property_add_child(parent, id, obj, &local_err);
 690         if (local_err) {
 691             goto error;
 692         }
 693     }
 694
 695     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 696     if (uc) {
 697         user_creatable_complete(uc, &local_err);
 698         if (local_err) {
 699             if (id != NULL) {
 700                 object_unparent(obj);
 701             }
 702             goto error;
 703         }
 704     }
 705
 706     object_unref(OBJECT(obj));
 707     return obj;
 708
 709  error:
 710     error_propagate(errp, local_err);
 711     object_unref(obj);
 712     return NULL;
 713 }
 714
 715
 716 int object_set_props(Object *obj,
 717                      Error **errp,
 718                      ...)
 719 {
 720     va_list vargs;
 721     int ret;
 722
 723     va_start(vargs, errp);
 724     ret = object_set_propv(obj, errp, vargs);
 725     va_end(vargs);
 726
 727     return ret;
 728 }
 729
 730
 731 int object_set_propv(Object *obj,
 732                      Error **errp,
 733                      va_list vargs)
 734 {
 735     const char *propname;
 736     Error *local_err = NULL;
 737
 738     propname = va_arg(vargs, char *);
 739     while (propname != NULL) {
 740         const char *value = va_arg(vargs, char *);
 741
 742         g_assert(value != NULL);
 743         object_property_parse(obj, value, propname, &local_err);
 744         if (local_err) {
 745             error_propagate(errp, local_err);
 746             return -1;
 747         }
 748         propname = va_arg(vargs, char *);
 749     }
 750
 751     return 0;
 752 }
 753
 754
 755 Object *object_dynamic_cast(Object *obj, const char *typename)
 756 {
 757     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 758         return obj;
 759     }
 760
 761     return NULL;
 762 }
 763
 764 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 765                                    const char *file, int line, const char *func)
 766 {
 767     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 768                                      typename, file, line, func);
 769
 770 #ifdef CONFIG_QOM_CAST_DEBUG
 771     int i;
 772     Object *inst;
 773
 774     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 775         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 776             goto out;
 777         }
 778     }
 779
 780     inst = object_dynamic_cast(obj, typename);
 781
 782     if (!inst && obj) {
 783         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 784                 file, line, func, obj, typename);
 785         abort();
 786     }
 787
 788     assert(obj == inst);
 789
 790     if (obj && obj == inst) {
 791         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 792             atomic_set(&obj->class->object_cast_cache[i - 1],
 793                        atomic_read(&obj->class->object_cast_cache[i]));
 794         }
 795         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 796     }
 797
 798 out:
 799 #endif
 800     return obj;
 801 }
 802
 803 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 804                                        const char *typename)
 805 {
 806     ObjectClass *ret = NULL;
 807     TypeImpl *target_type;
 808     TypeImpl *type;
 809
 810     if (!class) {
 811         return NULL;
 812     }
 813
 814     /* A simple fast path that can trigger a lot for leaf classes.  */
 815     type = class->type;
 816     if (type->name == typename) {
 817         return class;
 818     }
 819
 820     target_type = type_get_by_name(typename);
 821     if (!target_type) {
 822         /* target class type unknown, so fail the cast */
 823         return NULL;
 824     }
 825
 826     if (type->class->interfaces &&
 827             type_is_ancestor(target_type, type_interface)) {
 828         int found = 0;
 829         GSList *i;
 830
 831         for (i = class->interfaces; i; i = i->next) {
 832             ObjectClass *target_class = i->data;
 833
 834             if (type_is_ancestor(target_class->type, target_type)) {
 835                 ret = target_class;
 836                 found++;
 837             }
 838          }
 839
 840         /* The match was ambiguous, don't allow a cast */
 841         if (found > 1) {
 842             ret = NULL;
 843         }
 844     } else if (type_is_ancestor(type, target_type)) {
 845         ret = class;
 846     }
 847
 848     return ret;
 849 }
 850
 851 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 852                                               const char *typename,
 853                                               const char *file, int line,
 854                                               const char *func)
 855 {
 856     ObjectClass *ret;
 857
 858     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 859                                            typename, file, line, func);
 860
 861 #ifdef CONFIG_QOM_CAST_DEBUG
 862     int i;
 863
 864     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 865         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 866             ret = class;
 867             goto out;
 868         }
 869     }
 870 #else
 871     if (!class || !class->interfaces) {
 872         return class;
 873     }
 874 #endif
 875
 876     ret = object_class_dynamic_cast(class, typename);
 877     if (!ret && class) {
 878         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 879                 file, line, func, class, typename);
 880         abort();
 881     }
 882
 883 #ifdef CONFIG_QOM_CAST_DEBUG
 884     if (class && ret == class) {
 885         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 886             atomic_set(&class->class_cast_cache[i - 1],
 887                        atomic_read(&class->class_cast_cache[i]));
 888         }
 889         atomic_set(&class->class_cast_cache[i - 1], typename);
 890     }
 891 out:
 892 #endif
 893     return ret;
 894 }
 895
 896 const char *object_get_typename(const Object *obj)
 897 {
 898     return obj->class->type->name;
 899 }
 900
 901 ObjectClass *object_get_class(Object *obj)
 902 {
 903     return obj->class;
 904 }
 905
 906 bool object_class_is_abstract(ObjectClass *klass)
 907 {
 908     return klass->type->abstract;
 909 }
 910
 911 const char *object_class_get_name(ObjectClass *klass)
 912 {
 913     return klass->type->name;
 914 }
 915
 916 ObjectClass *object_class_by_name(const char *typename)
 917 {
 918     TypeImpl *type = type_get_by_name(typename);
 919
 920     if (!type) {
 921         return NULL;
 922     }
 923
 924     type_initialize(type);
 925
 926     return type->class;
 927 }
 928
 929 ObjectClass *object_class_get_parent(ObjectClass *class)
 930 {
 931     TypeImpl *type = type_get_parent(class->type);
 932
 933     if (!type) {
 934         return NULL;
 935     }
 936
 937     type_initialize(type);
 938
 939     return type->class;
 940 }
 941
 942 typedef struct OCFData
 943 {
 944     void (*fn)(ObjectClass *klass, void *opaque);
 945     const char *implements_type;
 946     bool include_abstract;
 947     void *opaque;
 948 } OCFData;
 949
 950 static void object_class_foreach_tramp(gpointer key, gpointer value,
 951                                        gpointer opaque)
 952 {
 953     OCFData *data = opaque;
 954     TypeImpl *type = value;
 955     ObjectClass *k;
 956
 957     type_initialize(type);
 958     k = type->class;
 959
 960     if (!data->include_abstract && type->abstract) {
 961         return;
 962     }
 963
 964     if (data->implements_type &&
 965         !object_class_dynamic_cast(k, data->implements_type)) {
 966         return;
 967     }
 968
 969     data->fn(k, data->opaque);
 970 }
 971
 972 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 973                           const char *implements_type, bool include_abstract,
 974                           void *opaque)
 975 {
 976     OCFData data = { fn, implements_type, include_abstract, opaque };
 977
 978     enumerating_types = true;
 979     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 980     enumerating_types = false;
 981 }
 982
 983 static int do_object_child_foreach(Object *obj,
 984                                    int (*fn)(Object *child, void *opaque),
 985                                    void *opaque, bool recurse)
 986 {
 987     GHashTableIter iter;
 988     ObjectProperty *prop;
 989     int ret = 0;
 990
 991     g_hash_table_iter_init(&iter, obj->properties);
 992     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
 993         if (object_property_is_child(prop)) {
 994             Object *child = prop->opaque;
 995
 996             ret = fn(child, opaque);
 997             if (ret != 0) {
 998                 break;
 999             }
1000             if (recurse) {
1001                 do_object_child_foreach(child, fn, opaque, true);
1002             }
1003         }
1004     }
1005     return ret;
1006 }
1007
1008 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
1009                          void *opaque)
1010 {
1011     return do_object_child_foreach(obj, fn, opaque, false);
1012 }
1013
1014 int object_child_foreach_recursive(Object *obj,
1015                                    int (*fn)(Object *child, void *opaque),
1016                                    void *opaque)
1017 {
1018     return do_object_child_foreach(obj, fn, opaque, true);
1019 }
1020
1021 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
1022 {
1023     GSList **list = opaque;
1024
1025     *list = g_slist_prepend(*list, klass);
1026 }
1027
1028 GSList *object_class_get_list(const char *implements_type,
1029                               bool include_abstract)
1030 {
1031     GSList *list = NULL;
1032
1033     object_class_foreach(object_class_get_list_tramp,
1034                          implements_type, include_abstract, &list);
1035     return list;
1036 }
1037
1038 static gint object_class_cmp(gconstpointer a, gconstpointer b)
1039 {
1040     return strcasecmp(object_class_get_name((ObjectClass *)a),
1041                       object_class_get_name((ObjectClass *)b));
1042 }
1043
1044 GSList *object_class_get_list_sorted(const char *implements_type,
1045                                      bool include_abstract)
1046 {
1047     return g_slist_sort(object_class_get_list(implements_type, include_abstract),
1048                         object_class_cmp);
1049 }
1050
1051 void object_ref(Object *obj)
1052 {
1053     if (!obj) {
1054         return;
1055     }
1056     atomic_inc(&obj->ref);
1057 }
1058
1059 void object_unref(Object *obj)
1060 {
1061     if (!obj) {
1062         return;
1063     }
1064     g_assert(obj->ref > 0);
1065
1066     /* parent always holds a reference to its children */
1067     if (atomic_fetch_dec(&obj->ref) == 1) {
1068         object_finalize(obj);
1069     }
1070 }
1071
1072 ObjectProperty *
1073 object_property_add(Object *obj, const char *name, const char *type,
1074                     ObjectPropertyAccessor *get,
1075                     ObjectPropertyAccessor *set,
1076                     ObjectPropertyRelease *release,
1077                     void *opaque, Error **errp)
1078 {
1079     ObjectProperty *prop;
1080     size_t name_len = strlen(name);
1081
1082     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
1083         int i;
1084         ObjectProperty *ret;
1085         char *name_no_array = g_strdup(name);
1086
1087         name_no_array[name_len - 3] = '\0';
1088         for (i = 0; ; ++i) {
1089             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
1090
1091             ret = object_property_add(obj, full_name, type, get, set,
1092                                       release, opaque, NULL);
1093             g_free(full_name);
1094             if (ret) {
1095                 break;
1096             }
1097         }
1098         g_free(name_no_array);
1099         return ret;
1100     }
1101
1102     if (object_property_find(obj, name, NULL) != NULL) {
1103         error_setg(errp, "attempt to add duplicate property '%s'"
1104                    " to object (type '%s')", name,
1105                    object_get_typename(obj));
1106         return NULL;
1107     }
1108
1109     prop = g_malloc0(sizeof(*prop));
1110
1111     prop->name = g_strdup(name);
1112     prop->type = g_strdup(type);
1113
1114     prop->get = get;
1115     prop->set = set;
1116     prop->release = release;
1117     prop->opaque = opaque;
1118
1119     g_hash_table_insert(obj->properties, prop->name, prop);
1120     return prop;
1121 }
1122
1123 ObjectProperty *
1124 object_class_property_add(ObjectClass *klass,
1125                           const char *name,
1126                           const char *type,
1127                           ObjectPropertyAccessor *get,
1128                           ObjectPropertyAccessor *set,
1129                           ObjectPropertyRelease *release,
1130                           void *opaque,
1131                           Error **errp)
1132 {
1133     ObjectProperty *prop;
1134
1135     if (object_class_property_find(klass, name, NULL) != NULL) {
1136         error_setg(errp, "attempt to add duplicate property '%s'"
1137                    " to object (type '%s')", name,
1138                    object_class_get_name(klass));
1139         return NULL;
1140     }
1141
1142     prop = g_malloc0(sizeof(*prop));
1143
1144     prop->name = g_strdup(name);
1145     prop->type = g_strdup(type);
1146
1147     prop->get = get;
1148     prop->set = set;
1149     prop->release = release;
1150     prop->opaque = opaque;
1151
1152     g_hash_table_insert(klass->properties, g_strdup(name), prop);
1153
1154     return prop;
1155 }
1156
1157 ObjectProperty *object_property_find(Object *obj, const char *name,
1158                                      Error **errp)
1159 {
1160     ObjectProperty *prop;
1161     ObjectClass *klass = object_get_class(obj);
1162
1163     prop = object_class_property_find(klass, name, NULL);
1164     if (prop) {
1165         return prop;
1166     }
1167
1168     prop = g_hash_table_lookup(obj->properties, name);
1169     if (prop) {
1170         return prop;
1171     }
1172
1173     error_setg(errp, "Property '.%s' not found", name);
1174     return NULL;
1175 }
1176
1177 void object_property_iter_init(ObjectPropertyIterator *iter,
1178                                Object *obj)
1179 {
1180     g_hash_table_iter_init(&iter->iter, obj->properties);
1181     iter->nextclass = object_get_class(obj);
1182 }
1183
1184 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1185 {
1186     gpointer key, val;
1187     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1188         if (!iter->nextclass) {
1189             return NULL;
1190         }
1191         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1192         iter->nextclass = object_class_get_parent(iter->nextclass);
1193     }
1194     return val;
1195 }
1196
1197 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1198                                      ObjectClass *klass)
1199 {
1200     g_hash_table_iter_init(&iter->iter, klass->properties);
1201     iter->nextclass = object_class_get_parent(klass);
1202 }
1203
1204 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1205                                            Error **errp)
1206 {
1207     ObjectProperty *prop;
1208     ObjectClass *parent_klass;
1209
1210     parent_klass = object_class_get_parent(klass);
1211     if (parent_klass) {
1212         prop = object_class_property_find(parent_klass, name, NULL);
1213         if (prop) {
1214             return prop;
1215         }
1216     }
1217
1218     prop = g_hash_table_lookup(klass->properties, name);
1219     if (!prop) {
1220         error_setg(errp, "Property '.%s' not found", name);
1221     }
1222     return prop;
1223 }
1224
1225 void object_property_del(Object *obj, const char *name, Error **errp)
1226 {
1227     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1228
1229     if (!prop) {
1230         error_setg(errp, "Property '.%s' not found", name);
1231         return;
1232     }
1233
1234     if (prop->release) {
1235         prop->release(obj, name, prop->opaque);
1236     }
1237     g_hash_table_remove(obj->properties, name);
1238 }
1239
1240 void object_property_get(Object *obj, Visitor *v, const char *name,
1241                          Error **errp)
1242 {
1243     ObjectProperty *prop = object_property_find(obj, name, errp);
1244     if (prop == NULL) {
1245         return;
1246     }
1247
1248     if (!prop->get) {
1249         error_setg(errp, QERR_PERMISSION_DENIED);
1250     } else {
1251         prop->get(obj, v, name, prop->opaque, errp);
1252     }
1253 }
1254
1255 void object_property_set(Object *obj, Visitor *v, const char *name,
1256                          Error **errp)
1257 {
1258     ObjectProperty *prop = object_property_find(obj, name, errp);
1259     if (prop == NULL) {
1260         return;
1261     }
1262
1263     if (!prop->set) {
1264         error_setg(errp, QERR_PERMISSION_DENIED);
1265     } else {
1266         prop->set(obj, v, name, prop->opaque, errp);
1267     }
1268 }
1269
1270 void object_property_set_str(Object *obj, const char *value,
1271                              const char *name, Error **errp)
1272 {
1273     QString *qstr = qstring_from_str(value);
1274     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1275
1276     qobject_unref(qstr);
1277 }
1278
1279 char *object_property_get_str(Object *obj, const char *name,
1280                               Error **errp)
1281 {
1282     QObject *ret = object_property_get_qobject(obj, name, errp);
1283     char *retval;
1284
1285     if (!ret) {
1286         return NULL;
1287     }
1288
1289     retval = g_strdup(qobject_get_try_str(ret));
1290     if (!retval) {
1291         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1292     }
1293
1294     qobject_unref(ret);
1295     return retval;
1296 }
1297
1298 void object_property_set_link(Object *obj, Object *value,
1299                               const char *name, Error **errp)
1300 {
1301     if (value) {
1302         gchar *path = object_get_canonical_path(value);
1303         object_property_set_str(obj, path, name, errp);
1304         g_free(path);
1305     } else {
1306         object_property_set_str(obj, "", name, errp);
1307     }
1308 }
1309
1310 Object *object_property_get_link(Object *obj, const char *name,
1311                                  Error **errp)
1312 {
1313     char *str = object_property_get_str(obj, name, errp);
1314     Object *target = NULL;
1315
1316     if (str && *str) {
1317         target = object_resolve_path(str, NULL);
1318         if (!target) {
1319             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1320                       "Device '%s' not found", str);
1321         }
1322     }
1323
1324     g_free(str);
1325     return target;
1326 }
1327
1328 void object_property_set_bool(Object *obj, bool value,
1329                               const char *name, Error **errp)
1330 {
1331     QBool *qbool = qbool_from_bool(value);
1332     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1333
1334     qobject_unref(qbool);
1335 }
1336
1337 bool object_property_get_bool(Object *obj, const char *name,
1338                               Error **errp)
1339 {
1340     QObject *ret = object_property_get_qobject(obj, name, errp);
1341     QBool *qbool;
1342     bool retval;
1343
1344     if (!ret) {
1345         return false;
1346     }
1347     qbool = qobject_to(QBool, ret);
1348     if (!qbool) {
1349         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1350         retval = false;
1351     } else {
1352         retval = qbool_get_bool(qbool);
1353     }
1354
1355     qobject_unref(ret);
1356     return retval;
1357 }
1358
1359 void object_property_set_int(Object *obj, int64_t value,
1360                              const char *name, Error **errp)
1361 {
1362     QNum *qnum = qnum_from_int(value);
1363     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1364
1365     qobject_unref(qnum);
1366 }
1367
1368 int64_t object_property_get_int(Object *obj, const char *name,
1369                                 Error **errp)
1370 {
1371     QObject *ret = object_property_get_qobject(obj, name, errp);
1372     QNum *qnum;
1373     int64_t retval;
1374
1375     if (!ret) {
1376         return -1;
1377     }
1378
1379     qnum = qobject_to(QNum, ret);
1380     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1381         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1382         retval = -1;
1383     }
1384
1385     qobject_unref(ret);
1386     return retval;
1387 }
1388
1389 void object_property_set_uint(Object *obj, uint64_t value,
1390                               const char *name, Error **errp)
1391 {
1392     QNum *qnum = qnum_from_uint(value);
1393
1394     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1395     qobject_unref(qnum);
1396 }
1397
1398 uint64_t object_property_get_uint(Object *obj, const char *name,
1399                                   Error **errp)
1400 {
1401     QObject *ret = object_property_get_qobject(obj, name, errp);
1402     QNum *qnum;
1403     uint64_t retval;
1404
1405     if (!ret) {
1406         return 0;
1407     }
1408     qnum = qobject_to(QNum, ret);
1409     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1410         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1411         retval = 0;
1412     }
1413
1414     qobject_unref(ret);
1415     return retval;
1416 }
1417
1418 typedef struct EnumProperty {
1419     const QEnumLookup *lookup;
1420     int (*get)(Object *, Error **);
1421     void (*set)(Object *, int, Error **);
1422 } EnumProperty;
1423
1424 int object_property_get_enum(Object *obj, const char *name,
1425                              const char *typename, Error **errp)
1426 {
1427     Error *err = NULL;
1428     Visitor *v;
1429     char *str;
1430     int ret;
1431     ObjectProperty *prop = object_property_find(obj, name, errp);
1432     EnumProperty *enumprop;
1433
1434     if (prop == NULL) {
1435         return 0;
1436     }
1437
1438     if (!g_str_equal(prop->type, typename)) {
1439         error_setg(errp, "Property %s on %s is not '%s' enum type",
1440                    name, object_class_get_name(
1441                        object_get_class(obj)), typename);
1442         return 0;
1443     }
1444
1445     enumprop = prop->opaque;
1446
1447     v = string_output_visitor_new(false, &str);
1448     object_property_get(obj, v, name, &err);
1449     if (err) {
1450         error_propagate(errp, err);
1451         visit_free(v);
1452         return 0;
1453     }
1454     visit_complete(v, &str);
1455     visit_free(v);
1456     v = string_input_visitor_new(str);
1457     visit_type_enum(v, name, &ret, enumprop->lookup, errp);
1458
1459     g_free(str);
1460     visit_free(v);
1461
1462     return ret;
1463 }
1464
1465 void object_property_get_uint16List(Object *obj, const char *name,
1466                                     uint16List **list, Error **errp)
1467 {
1468     Error *err = NULL;
1469     Visitor *v;
1470     char *str;
1471
1472     v = string_output_visitor_new(false, &str);
1473     object_property_get(obj, v, name, &err);
1474     if (err) {
1475         error_propagate(errp, err);
1476         goto out;
1477     }
1478     visit_complete(v, &str);
1479     visit_free(v);
1480     v = string_input_visitor_new(str);
1481     visit_type_uint16List(v, NULL, list, errp);
1482
1483     g_free(str);
1484 out:
1485     visit_free(v);
1486 }
1487
1488 void object_property_parse(Object *obj, const char *string,
1489                            const char *name, Error **errp)
1490 {
1491     Visitor *v = string_input_visitor_new(string);
1492     object_property_set(obj, v, name, errp);
1493     visit_free(v);
1494 }
1495
1496 char *object_property_print(Object *obj, const char *name, bool human,
1497                             Error **errp)
1498 {
1499     Visitor *v;
1500     char *string = NULL;
1501     Error *local_err = NULL;
1502
1503     v = string_output_visitor_new(human, &string);
1504     object_property_get(obj, v, name, &local_err);
1505     if (local_err) {
1506         error_propagate(errp, local_err);
1507         goto out;
1508     }
1509
1510     visit_complete(v, &string);
1511
1512 out:
1513     visit_free(v);
1514     return string;
1515 }
1516
1517 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1518 {
1519     ObjectProperty *prop = object_property_find(obj, name, errp);
1520     if (prop == NULL) {
1521         return NULL;
1522     }
1523
1524     return prop->type;
1525 }
1526
1527 Object *object_get_root(void)
1528 {
1529     static Object *root;
1530
1531     if (!root) {
1532         root = object_new("container");
1533     }
1534
1535     return root;
1536 }
1537
1538 Object *object_get_objects_root(void)
1539 {
1540     return container_get(object_get_root(), "/objects");
1541 }
1542
1543 Object *object_get_internal_root(void)
1544 {
1545     static Object *internal_root;
1546
1547     if (!internal_root) {
1548         internal_root = object_new("container");
1549     }
1550
1551     return internal_root;
1552 }
1553
1554 static void object_get_child_property(Object *obj, Visitor *v,
1555                                       const char *name, void *opaque,
1556                                       Error **errp)
1557 {
1558     Object *child = opaque;
1559     gchar *path;
1560
1561     path = object_get_canonical_path(child);
1562     visit_type_str(v, name, &path, errp);
1563     g_free(path);
1564 }
1565
1566 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1567 {
1568     return opaque;
1569 }
1570
1571 static void object_finalize_child_property(Object *obj, const char *name,
1572                                            void *opaque)
1573 {
1574     Object *child = opaque;
1575
1576     if (child->class->unparent) {
1577         (child->class->unparent)(child);
1578     }
1579     child->parent = NULL;
1580     object_unref(child);
1581 }
1582
1583 void object_property_add_child(Object *obj, const char *name,
1584                                Object *child, Error **errp)
1585 {
1586     Error *local_err = NULL;
1587     gchar *type;
1588     ObjectProperty *op;
1589
1590     if (child->parent != NULL) {
1591         error_setg(errp, "child object is already parented");
1592         return;
1593     }
1594
1595     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1596
1597     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1598                              object_finalize_child_property, child, &local_err);
1599     if (local_err) {
1600         error_propagate(errp, local_err);
1601         goto out;
1602     }
1603
1604     op->resolve = object_resolve_child_property;
1605     object_ref(child);
1606     child->parent = obj;
1607
1608 out:
1609     g_free(type);
1610 }
1611
1612 void object_property_allow_set_link(const Object *obj, const char *name,
1613                                     Object *val, Error **errp)
1614 {
1615     /* Allow the link to be set, always */
1616 }
1617
1618 typedef struct {
1619     Object **child;
1620     void (*check)(const Object *, const char *, Object *, Error **);
1621     ObjectPropertyLinkFlags flags;
1622 } LinkProperty;
1623
1624 static void object_get_link_property(Object *obj, Visitor *v,
1625                                      const char *name, void *opaque,
1626                                      Error **errp)
1627 {
1628     LinkProperty *lprop = opaque;
1629     Object **child = lprop->child;
1630     gchar *path;
1631
1632     if (*child) {
1633         path = object_get_canonical_path(*child);
1634         visit_type_str(v, name, &path, errp);
1635         g_free(path);
1636     } else {
1637         path = (gchar *)"";
1638         visit_type_str(v, name, &path, errp);
1639     }
1640 }
1641
1642 /*
1643  * object_resolve_link:
1644  *
1645  * Lookup an object and ensure its type matches the link property type.  This
1646  * is similar to object_resolve_path() except type verification against the
1647  * link property is performed.
1648  *
1649  * Returns: The matched object or NULL on path lookup failures.
1650  */
1651 static Object *object_resolve_link(Object *obj, const char *name,
1652                                    const char *path, Error **errp)
1653 {
1654     const char *type;
1655     gchar *target_type;
1656     bool ambiguous = false;
1657     Object *target;
1658
1659     /* Go from link<FOO> to FOO.  */
1660     type = object_property_get_type(obj, name, NULL);
1661     target_type = g_strndup(&type[5], strlen(type) - 6);
1662     target = object_resolve_path_type(path, target_type, &ambiguous);
1663
1664     if (ambiguous) {
1665         error_setg(errp, "Path '%s' does not uniquely identify an object",
1666                    path);
1667     } else if (!target) {
1668         target = object_resolve_path(path, &ambiguous);
1669         if (target || ambiguous) {
1670             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1671         } else {
1672             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1673                       "Device '%s' not found", path);
1674         }
1675         target = NULL;
1676     }
1677     g_free(target_type);
1678
1679     return target;
1680 }
1681
1682 static void object_set_link_property(Object *obj, Visitor *v,
1683                                      const char *name, void *opaque,
1684                                      Error **errp)
1685 {
1686     Error *local_err = NULL;
1687     LinkProperty *prop = opaque;
1688     Object **child = prop->child;
1689     Object *old_target = *child;
1690     Object *new_target = NULL;
1691     char *path = NULL;
1692
1693     visit_type_str(v, name, &path, &local_err);
1694
1695     if (!local_err && strcmp(path, "") != 0) {
1696         new_target = object_resolve_link(obj, name, path, &local_err);
1697     }
1698
1699     g_free(path);
1700     if (local_err) {
1701         error_propagate(errp, local_err);
1702         return;
1703     }
1704
1705     prop->check(obj, name, new_target, &local_err);
1706     if (local_err) {
1707         error_propagate(errp, local_err);
1708         return;
1709     }
1710
1711     *child = new_target;
1712     if (prop->flags == OBJ_PROP_LINK_STRONG) {
1713         object_ref(new_target);
1714         object_unref(old_target);
1715     }
1716 }
1717
1718 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1719 {
1720     LinkProperty *lprop = opaque;
1721
1722     return *lprop->child;
1723 }
1724
1725 static void object_release_link_property(Object *obj, const char *name,
1726                                          void *opaque)
1727 {
1728     LinkProperty *prop = opaque;
1729
1730     if ((prop->flags & OBJ_PROP_LINK_STRONG) && *prop->child) {
1731         object_unref(*prop->child);
1732     }
1733     g_free(prop);
1734 }
1735
1736 void object_property_add_link(Object *obj, const char *name,
1737                               const char *type, Object **child,
1738                               void (*check)(const Object *, const char *,
1739                                             Object *, Error **),
1740                               ObjectPropertyLinkFlags flags,
1741                               Error **errp)
1742 {
1743     Error *local_err = NULL;
1744     LinkProperty *prop = g_malloc(sizeof(*prop));
1745     gchar *full_type;
1746     ObjectProperty *op;
1747
1748     prop->child = child;
1749     prop->check = check;
1750     prop->flags = flags;
1751
1752     full_type = g_strdup_printf("link<%s>", type);
1753
1754     op = object_property_add(obj, name, full_type,
1755                              object_get_link_property,
1756                              check ? object_set_link_property : NULL,
1757                              object_release_link_property,
1758                              prop,
1759                              &local_err);
1760     if (local_err) {
1761         error_propagate(errp, local_err);
1762         g_free(prop);
1763         goto out;
1764     }
1765
1766     op->resolve = object_resolve_link_property;
1767
1768 out:
1769     g_free(full_type);
1770 }
1771
1772 void object_property_add_const_link(Object *obj, const char *name,
1773                                     Object *target, Error **errp)
1774 {
1775     char *link_type;
1776     ObjectProperty *op;
1777
1778     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1779     op = object_property_add(obj, name, link_type,
1780                              object_get_child_property, NULL,
1781                              NULL, target, errp);
1782     if (op != NULL) {
1783         op->resolve = object_resolve_child_property;
1784     }
1785     g_free(link_type);
1786 }
1787
1788 gchar *object_get_canonical_path_component(Object *obj)
1789 {
1790     ObjectProperty *prop = NULL;
1791     GHashTableIter iter;
1792
1793     if (obj->parent == NULL) {
1794         return NULL;
1795     }
1796
1797     g_hash_table_iter_init(&iter, obj->parent->properties);
1798     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1799         if (!object_property_is_child(prop)) {
1800             continue;
1801         }
1802
1803         if (prop->opaque == obj) {
1804             return g_strdup(prop->name);
1805         }
1806     }
1807
1808     /* obj had a parent but was not a child, should never happen */
1809     g_assert_not_reached();
1810     return NULL;
1811 }
1812
1813 gchar *object_get_canonical_path(Object *obj)
1814 {
1815     Object *root = object_get_root();
1816     char *newpath, *path = NULL;
1817
1818     if (obj == root) {
1819         return g_strdup("/");
1820     }
1821
1822     do {
1823         char *component = object_get_canonical_path_component(obj);
1824
1825         if (!component) {
1826             /* A canonical path must be complete, so discard what was
1827              * collected so far.
1828              */
1829             g_free(path);
1830             return NULL;
1831         }
1832
1833         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
1834         g_free(path);
1835         g_free(component);
1836         path = newpath;
1837         obj = obj->parent;
1838     } while (obj != root);
1839
1840     return path;
1841 }
1842
1843 Object *object_resolve_path_component(Object *parent, const gchar *part)
1844 {
1845     ObjectProperty *prop = object_property_find(parent, part, NULL);
1846     if (prop == NULL) {
1847         return NULL;
1848     }
1849
1850     if (prop->resolve) {
1851         return prop->resolve(parent, prop->opaque, part);
1852     } else {
1853         return NULL;
1854     }
1855 }
1856
1857 static Object *object_resolve_abs_path(Object *parent,
1858                                           gchar **parts,
1859                                           const char *typename,
1860                                           int index)
1861 {
1862     Object *child;
1863
1864     if (parts[index] == NULL) {
1865         return object_dynamic_cast(parent, typename);
1866     }
1867
1868     if (strcmp(parts[index], "") == 0) {
1869         return object_resolve_abs_path(parent, parts, typename, index + 1);
1870     }
1871
1872     child = object_resolve_path_component(parent, parts[index]);
1873     if (!child) {
1874         return NULL;
1875     }
1876
1877     return object_resolve_abs_path(child, parts, typename, index + 1);
1878 }
1879
1880 static Object *object_resolve_partial_path(Object *parent,
1881                                               gchar **parts,
1882                                               const char *typename,
1883                                               bool *ambiguous)
1884 {
1885     Object *obj;
1886     GHashTableIter iter;
1887     ObjectProperty *prop;
1888
1889     obj = object_resolve_abs_path(parent, parts, typename, 0);
1890
1891     g_hash_table_iter_init(&iter, parent->properties);
1892     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1893         Object *found;
1894
1895         if (!object_property_is_child(prop)) {
1896             continue;
1897         }
1898
1899         found = object_resolve_partial_path(prop->opaque, parts,
1900                                             typename, ambiguous);
1901         if (found) {
1902             if (obj) {
1903                 *ambiguous = true;
1904                 return NULL;
1905             }
1906             obj = found;
1907         }
1908
1909         if (*ambiguous) {
1910             return NULL;
1911         }
1912     }
1913
1914     return obj;
1915 }
1916
1917 Object *object_resolve_path_type(const char *path, const char *typename,
1918                                  bool *ambiguousp)
1919 {
1920     Object *obj;
1921     gchar **parts;
1922
1923     parts = g_strsplit(path, "/", 0);
1924     assert(parts);
1925
1926     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1927         bool ambiguous = false;
1928         obj = object_resolve_partial_path(object_get_root(), parts,
1929                                           typename, &ambiguous);
1930         if (ambiguousp) {
1931             *ambiguousp = ambiguous;
1932         }
1933     } else {
1934         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1935     }
1936
1937     g_strfreev(parts);
1938
1939     return obj;
1940 }
1941
1942 Object *object_resolve_path(const char *path, bool *ambiguous)
1943 {
1944     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1945 }
1946
1947 typedef struct StringProperty
1948 {
1949     char *(*get)(Object *, Error **);
1950     void (*set)(Object *, const char *, Error **);
1951 } StringProperty;
1952
1953 static void property_get_str(Object *obj, Visitor *v, const char *name,
1954                              void *opaque, Error **errp)
1955 {
1956     StringProperty *prop = opaque;
1957     char *value;
1958     Error *err = NULL;
1959
1960     value = prop->get(obj, &err);
1961     if (err) {
1962         error_propagate(errp, err);
1963         return;
1964     }
1965
1966     visit_type_str(v, name, &value, errp);
1967     g_free(value);
1968 }
1969
1970 static void property_set_str(Object *obj, Visitor *v, const char *name,
1971                              void *opaque, Error **errp)
1972 {
1973     StringProperty *prop = opaque;
1974     char *value;
1975     Error *local_err = NULL;
1976
1977     visit_type_str(v, name, &value, &local_err);
1978     if (local_err) {
1979         error_propagate(errp, local_err);
1980         return;
1981     }
1982
1983     prop->set(obj, value, errp);
1984     g_free(value);
1985 }
1986
1987 static void property_release_str(Object *obj, const char *name,
1988                                  void *opaque)
1989 {
1990     StringProperty *prop = opaque;
1991     g_free(prop);
1992 }
1993
1994 void object_property_add_str(Object *obj, const char *name,
1995                            char *(*get)(Object *, Error **),
1996                            void (*set)(Object *, const char *, Error **),
1997                            Error **errp)
1998 {
1999     Error *local_err = NULL;
2000     StringProperty *prop = g_malloc0(sizeof(*prop));
2001
2002     prop->get = get;
2003     prop->set = set;
2004
2005     object_property_add(obj, name, "string",
2006                         get ? property_get_str : NULL,
2007                         set ? property_set_str : NULL,
2008                         property_release_str,
2009                         prop, &local_err);
2010     if (local_err) {
2011         error_propagate(errp, local_err);
2012         g_free(prop);
2013     }
2014 }
2015
2016 void object_class_property_add_str(ObjectClass *klass, const char *name,
2017                                    char *(*get)(Object *, Error **),
2018                                    void (*set)(Object *, const char *,
2019                                                Error **),
2020                                    Error **errp)
2021 {
2022     Error *local_err = NULL;
2023     StringProperty *prop = g_malloc0(sizeof(*prop));
2024
2025     prop->get = get;
2026     prop->set = set;
2027
2028     object_class_property_add(klass, name, "string",
2029                               get ? property_get_str : NULL,
2030                               set ? property_set_str : NULL,
2031                               property_release_str,
2032                               prop, &local_err);
2033     if (local_err) {
2034         error_propagate(errp, local_err);
2035         g_free(prop);
2036     }
2037 }
2038
2039 typedef struct BoolProperty
2040 {
2041     bool (*get)(Object *, Error **);
2042     void (*set)(Object *, bool, Error **);
2043 } BoolProperty;
2044
2045 static void property_get_bool(Object *obj, Visitor *v, const char *name,
2046                               void *opaque, Error **errp)
2047 {
2048     BoolProperty *prop = opaque;
2049     bool value;
2050     Error *err = NULL;
2051
2052     value = prop->get(obj, &err);
2053     if (err) {
2054         error_propagate(errp, err);
2055         return;
2056     }
2057
2058     visit_type_bool(v, name, &value, errp);
2059 }
2060
2061 static void property_set_bool(Object *obj, Visitor *v, const char *name,
2062                               void *opaque, Error **errp)
2063 {
2064     BoolProperty *prop = opaque;
2065     bool value;
2066     Error *local_err = NULL;
2067
2068     visit_type_bool(v, name, &value, &local_err);
2069     if (local_err) {
2070         error_propagate(errp, local_err);
2071         return;
2072     }
2073
2074     prop->set(obj, value, errp);
2075 }
2076
2077 static void property_release_bool(Object *obj, const char *name,
2078                                   void *opaque)
2079 {
2080     BoolProperty *prop = opaque;
2081     g_free(prop);
2082 }
2083
2084 void object_property_add_bool(Object *obj, const char *name,
2085                               bool (*get)(Object *, Error **),
2086                               void (*set)(Object *, bool, Error **),
2087                               Error **errp)
2088 {
2089     Error *local_err = NULL;
2090     BoolProperty *prop = g_malloc0(sizeof(*prop));
2091
2092     prop->get = get;
2093     prop->set = set;
2094
2095     object_property_add(obj, name, "bool",
2096                         get ? property_get_bool : NULL,
2097                         set ? property_set_bool : NULL,
2098                         property_release_bool,
2099                         prop, &local_err);
2100     if (local_err) {
2101         error_propagate(errp, local_err);
2102         g_free(prop);
2103     }
2104 }
2105
2106 void object_class_property_add_bool(ObjectClass *klass, const char *name,
2107                                     bool (*get)(Object *, Error **),
2108                                     void (*set)(Object *, bool, Error **),
2109                                     Error **errp)
2110 {
2111     Error *local_err = NULL;
2112     BoolProperty *prop = g_malloc0(sizeof(*prop));
2113
2114     prop->get = get;
2115     prop->set = set;
2116
2117     object_class_property_add(klass, name, "bool",
2118                               get ? property_get_bool : NULL,
2119                               set ? property_set_bool : NULL,
2120                               property_release_bool,
2121                               prop, &local_err);
2122     if (local_err) {
2123         error_propagate(errp, local_err);
2124         g_free(prop);
2125     }
2126 }
2127
2128 static void property_get_enum(Object *obj, Visitor *v, const char *name,
2129                               void *opaque, Error **errp)
2130 {
2131     EnumProperty *prop = opaque;
2132     int value;
2133     Error *err = NULL;
2134
2135     value = prop->get(obj, &err);
2136     if (err) {
2137         error_propagate(errp, err);
2138         return;
2139     }
2140
2141     visit_type_enum(v, name, &value, prop->lookup, errp);
2142 }
2143
2144 static void property_set_enum(Object *obj, Visitor *v, const char *name,
2145                               void *opaque, Error **errp)
2146 {
2147     EnumProperty *prop = opaque;
2148     int value;
2149     Error *err = NULL;
2150
2151     visit_type_enum(v, name, &value, prop->lookup, &err);
2152     if (err) {
2153         error_propagate(errp, err);
2154         return;
2155     }
2156     prop->set(obj, value, errp);
2157 }
2158
2159 static void property_release_enum(Object *obj, const char *name,
2160                                   void *opaque)
2161 {
2162     EnumProperty *prop = opaque;
2163     g_free(prop);
2164 }
2165
2166 void object_property_add_enum(Object *obj, const char *name,
2167                               const char *typename,
2168                               const QEnumLookup *lookup,
2169                               int (*get)(Object *, Error **),
2170                               void (*set)(Object *, int, Error **),
2171                               Error **errp)
2172 {
2173     Error *local_err = NULL;
2174     EnumProperty *prop = g_malloc(sizeof(*prop));
2175
2176     prop->lookup = lookup;
2177     prop->get = get;
2178     prop->set = set;
2179
2180     object_property_add(obj, name, typename,
2181                         get ? property_get_enum : NULL,
2182                         set ? property_set_enum : NULL,
2183                         property_release_enum,
2184                         prop, &local_err);
2185     if (local_err) {
2186         error_propagate(errp, local_err);
2187         g_free(prop);
2188     }
2189 }
2190
2191 void object_class_property_add_enum(ObjectClass *klass, const char *name,
2192                                     const char *typename,
2193                                     const QEnumLookup *lookup,
2194                                     int (*get)(Object *, Error **),
2195                                     void (*set)(Object *, int, Error **),
2196                                     Error **errp)
2197 {
2198     Error *local_err = NULL;
2199     EnumProperty *prop = g_malloc(sizeof(*prop));
2200
2201     prop->lookup = lookup;
2202     prop->get = get;
2203     prop->set = set;
2204
2205     object_class_property_add(klass, name, typename,
2206                               get ? property_get_enum : NULL,
2207                               set ? property_set_enum : NULL,
2208                               property_release_enum,
2209                               prop, &local_err);
2210     if (local_err) {
2211         error_propagate(errp, local_err);
2212         g_free(prop);
2213     }
2214 }
2215
2216 typedef struct TMProperty {
2217     void (*get)(Object *, struct tm *, Error **);
2218 } TMProperty;
2219
2220 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2221                             void *opaque, Error **errp)
2222 {
2223     TMProperty *prop = opaque;
2224     Error *err = NULL;
2225     struct tm value;
2226
2227     prop->get(obj, &value, &err);
2228     if (err) {
2229         goto out;
2230     }
2231
2232     visit_start_struct(v, name, NULL, 0, &err);
2233     if (err) {
2234         goto out;
2235     }
2236     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2237     if (err) {
2238         goto out_end;
2239     }
2240     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2241     if (err) {
2242         goto out_end;
2243     }
2244     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2245     if (err) {
2246         goto out_end;
2247     }
2248     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2249     if (err) {
2250         goto out_end;
2251     }
2252     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2253     if (err) {
2254         goto out_end;
2255     }
2256     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2257     if (err) {
2258         goto out_end;
2259     }
2260     visit_check_struct(v, &err);
2261 out_end:
2262     visit_end_struct(v, NULL);
2263 out:
2264     error_propagate(errp, err);
2265
2266 }
2267
2268 static void property_release_tm(Object *obj, const char *name,
2269                                 void *opaque)
2270 {
2271     TMProperty *prop = opaque;
2272     g_free(prop);
2273 }
2274
2275 void object_property_add_tm(Object *obj, const char *name,
2276                             void (*get)(Object *, struct tm *, Error **),
2277                             Error **errp)
2278 {
2279     Error *local_err = NULL;
2280     TMProperty *prop = g_malloc0(sizeof(*prop));
2281
2282     prop->get = get;
2283
2284     object_property_add(obj, name, "struct tm",
2285                         get ? property_get_tm : NULL, NULL,
2286                         property_release_tm,
2287                         prop, &local_err);
2288     if (local_err) {
2289         error_propagate(errp, local_err);
2290         g_free(prop);
2291     }
2292 }
2293
2294 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2295                                   void (*get)(Object *, struct tm *, Error **),
2296                                   Error **errp)
2297 {
2298     Error *local_err = NULL;
2299     TMProperty *prop = g_malloc0(sizeof(*prop));
2300
2301     prop->get = get;
2302
2303     object_class_property_add(klass, name, "struct tm",
2304                               get ? property_get_tm : NULL, NULL,
2305                               property_release_tm,
2306                               prop, &local_err);
2307     if (local_err) {
2308         error_propagate(errp, local_err);
2309         g_free(prop);
2310     }
2311 }
2312
2313 static char *qdev_get_type(Object *obj, Error **errp)
2314 {
2315     return g_strdup(object_get_typename(obj));
2316 }
2317
2318 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2319                                    void *opaque, Error **errp)
2320 {
2321     uint8_t value = *(uint8_t *)opaque;
2322     visit_type_uint8(v, name, &value, errp);
2323 }
2324
2325 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2326                                     void *opaque, Error **errp)
2327 {
2328     uint16_t value = *(uint16_t *)opaque;
2329     visit_type_uint16(v, name, &value, errp);
2330 }
2331
2332 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2333                                     void *opaque, Error **errp)
2334 {
2335     uint32_t value = *(uint32_t *)opaque;
2336     visit_type_uint32(v, name, &value, errp);
2337 }
2338
2339 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2340                                     void *opaque, Error **errp)
2341 {
2342     uint64_t value = *(uint64_t *)opaque;
2343     visit_type_uint64(v, name, &value, errp);
2344 }
2345
2346 void object_property_add_uint8_ptr(Object *obj, const char *name,
2347                                    const uint8_t *v, Error **errp)
2348 {
2349     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2350                         NULL, NULL, (void *)v, errp);
2351 }
2352
2353 void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2354                                          const uint8_t *v, Error **errp)
2355 {
2356     object_class_property_add(klass, name, "uint8", property_get_uint8_ptr,
2357                               NULL, NULL, (void *)v, errp);
2358 }
2359
2360 void object_property_add_uint16_ptr(Object *obj, const char *name,
2361                                     const uint16_t *v, Error **errp)
2362 {
2363     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2364                         NULL, NULL, (void *)v, errp);
2365 }
2366
2367 void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2368                                           const uint16_t *v, Error **errp)
2369 {
2370     object_class_property_add(klass, name, "uint16", property_get_uint16_ptr,
2371                               NULL, NULL, (void *)v, errp);
2372 }
2373
2374 void object_property_add_uint32_ptr(Object *obj, const char *name,
2375                                     const uint32_t *v, Error **errp)
2376 {
2377     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2378                         NULL, NULL, (void *)v, errp);
2379 }
2380
2381 void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2382                                           const uint32_t *v, Error **errp)
2383 {
2384     object_class_property_add(klass, name, "uint32", property_get_uint32_ptr,
2385                               NULL, NULL, (void *)v, errp);
2386 }
2387
2388 void object_property_add_uint64_ptr(Object *obj, const char *name,
2389                                     const uint64_t *v, Error **errp)
2390 {
2391     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2392                         NULL, NULL, (void *)v, errp);
2393 }
2394
2395 void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2396                                           const uint64_t *v, Error **errp)
2397 {
2398     object_class_property_add(klass, name, "uint64", property_get_uint64_ptr,
2399                               NULL, NULL, (void *)v, errp);
2400 }
2401
2402 typedef struct {
2403     Object *target_obj;
2404     char *target_name;
2405 } AliasProperty;
2406
2407 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2408                                void *opaque, Error **errp)
2409 {
2410     AliasProperty *prop = opaque;
2411
2412     object_property_get(prop->target_obj, v, prop->target_name, errp);
2413 }
2414
2415 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2416                                void *opaque, Error **errp)
2417 {
2418     AliasProperty *prop = opaque;
2419
2420     object_property_set(prop->target_obj, v, prop->target_name, errp);
2421 }
2422
2423 static Object *property_resolve_alias(Object *obj, void *opaque,
2424                                       const gchar *part)
2425 {
2426     AliasProperty *prop = opaque;
2427
2428     return object_resolve_path_component(prop->target_obj, prop->target_name);
2429 }
2430
2431 static void property_release_alias(Object *obj, const char *name, void *opaque)
2432 {
2433     AliasProperty *prop = opaque;
2434
2435     g_free(prop->target_name);
2436     g_free(prop);
2437 }
2438
2439 void object_property_add_alias(Object *obj, const char *name,
2440                                Object *target_obj, const char *target_name,
2441                                Error **errp)
2442 {
2443     AliasProperty *prop;
2444     ObjectProperty *op;
2445     ObjectProperty *target_prop;
2446     gchar *prop_type;
2447     Error *local_err = NULL;
2448
2449     target_prop = object_property_find(target_obj, target_name, errp);
2450     if (!target_prop) {
2451         return;
2452     }
2453
2454     if (object_property_is_child(target_prop)) {
2455         prop_type = g_strdup_printf("link%s",
2456                                     target_prop->type + strlen("child"));
2457     } else {
2458         prop_type = g_strdup(target_prop->type);
2459     }
2460
2461     prop = g_malloc(sizeof(*prop));
2462     prop->target_obj = target_obj;
2463     prop->target_name = g_strdup(target_name);
2464
2465     op = object_property_add(obj, name, prop_type,
2466                              property_get_alias,
2467                              property_set_alias,
2468                              property_release_alias,
2469                              prop, &local_err);
2470     if (local_err) {
2471         error_propagate(errp, local_err);
2472         g_free(prop);
2473         goto out;
2474     }
2475     op->resolve = property_resolve_alias;
2476
2477     object_property_set_description(obj, op->name,
2478                                     target_prop->description,
2479                                     &error_abort);
2480
2481 out:
2482     g_free(prop_type);
2483 }
2484
2485 void object_property_set_description(Object *obj, const char *name,
2486                                      const char *description, Error **errp)
2487 {
2488     ObjectProperty *op;
2489
2490     op = object_property_find(obj, name, errp);
2491     if (!op) {
2492         return;
2493     }
2494
2495     g_free(op->description);
2496     op->description = g_strdup(description);
2497 }
2498
2499 void object_class_property_set_description(ObjectClass *klass,
2500                                            const char *name,
2501                                            const char *description,
2502                                            Error **errp)
2503 {
2504     ObjectProperty *op;
2505
2506     op = g_hash_table_lookup(klass->properties, name);
2507     if (!op) {
2508         error_setg(errp, "Property '.%s' not found", name);
2509         return;
2510     }
2511
2512     g_free(op->description);
2513     op->description = g_strdup(description);
2514 }
2515
2516 static void object_class_init(ObjectClass *klass, void *data)
2517 {
2518     object_class_property_add_str(klass, "type", qdev_get_type,
2519                                   NULL, &error_abort);
2520 }
2521
2522 static void register_types(void)
2523 {
2524     static TypeInfo interface_info = {
2525         .name = TYPE_INTERFACE,
2526         .class_size = sizeof(InterfaceClass),
2527         .abstract = true,
2528     };
2529
2530     static TypeInfo object_info = {
2531         .name = TYPE_OBJECT,
2532         .instance_size = sizeof(Object),
2533         .class_init = object_class_init,
2534         .abstract = true,
2535     };
2536
2537     type_interface = type_register_internal(&interface_info);
2538     type_register_internal(&object_info);
2539 }
2540
2541 type_init(register_types)