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 "hw/qdev-core.h"
  15 #include "qapi/error.h"
  16 #include "qom/object.h"
  17 #include "qom/object_interfaces.h"
  18 #include "qemu/cutils.h"
  19 #include "qapi/visitor.h"
  20 #include "qapi/string-input-visitor.h"
  21 #include "qapi/string-output-visitor.h"
  22 #include "qapi/qapi-builtin-visit.h"
  23 #include "qapi/qmp/qerror.h"
  24 #include "trace.h"
  25
  26 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  27  * of the QOM core on QObject?  */
  28 #include "qom/qom-qobject.h"
  29 #include "qapi/qmp/qbool.h"
  30 #include "qapi/qmp/qnum.h"
  31 #include "qapi/qmp/qstring.h"
  32 #include "qemu/error-report.h"
  33
  34 #define MAX_INTERFACES 32
  35
  36 typedef struct InterfaceImpl InterfaceImpl;
  37 typedef struct TypeImpl TypeImpl;
  38
  39 struct InterfaceImpl
  40 {
  41     const char *typename;
  42 };
  43
  44 struct TypeImpl
  45 {
  46     const char *name;
  47
  48     size_t class_size;
  49
  50     size_t instance_size;
  51
  52     void (*class_init)(ObjectClass *klass, void *data);
  53     void (*class_base_init)(ObjectClass *klass, void *data);
  54
  55     void *class_data;
  56
  57     void (*instance_init)(Object *obj);
  58     void (*instance_post_init)(Object *obj);
  59     void (*instance_finalize)(Object *obj);
  60
  61     bool abstract;
  62
  63     const char *parent;
  64     TypeImpl *parent_type;
  65
  66     ObjectClass *class;
  67
  68     int num_interfaces;
  69     InterfaceImpl interfaces[MAX_INTERFACES];
  70 };
  71
  72 static Type type_interface;
  73
  74 static GHashTable *type_table_get(void)
  75 {
  76     static GHashTable *type_table;
  77
  78     if (type_table == NULL) {
  79         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  80     }
  81
  82     return type_table;
  83 }
  84
  85 static bool enumerating_types;
  86
  87 static void type_table_add(TypeImpl *ti)
  88 {
  89     assert(!enumerating_types);
  90     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  91 }
  92
  93 static TypeImpl *type_table_lookup(const char *name)
  94 {
  95     return g_hash_table_lookup(type_table_get(), name);
  96 }
  97
  98 static TypeImpl *type_new(const TypeInfo *info)
  99 {
 100     TypeImpl *ti = g_malloc0(sizeof(*ti));
 101     int i;
 102
 103     g_assert(info->name != NULL);
 104
 105     if (type_table_lookup(info->name) != NULL) {
 106         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 107         abort();
 108     }
 109
 110     ti->name = g_strdup(info->name);
 111     ti->parent = g_strdup(info->parent);
 112
 113     ti->class_size = info->class_size;
 114     ti->instance_size = info->instance_size;
 115
 116     ti->class_init = info->class_init;
 117     ti->class_base_init = info->class_base_init;
 118     ti->class_data = info->class_data;
 119
 120     ti->instance_init = info->instance_init;
 121     ti->instance_post_init = info->instance_post_init;
 122     ti->instance_finalize = info->instance_finalize;
 123
 124     ti->abstract = info->abstract;
 125
 126     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 127         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 128     }
 129     ti->num_interfaces = i;
 130
 131     return ti;
 132 }
 133
 134 static TypeImpl *type_register_internal(const TypeInfo *info)
 135 {
 136     TypeImpl *ti;
 137     ti = type_new(info);
 138
 139     type_table_add(ti);
 140     return ti;
 141 }
 142
 143 TypeImpl *type_register(const TypeInfo *info)
 144 {
 145     assert(info->parent);
 146     return type_register_internal(info);
 147 }
 148
 149 TypeImpl *type_register_static(const TypeInfo *info)
 150 {
 151     return type_register(info);
 152 }
 153
 154 void type_register_static_array(const TypeInfo *infos, int nr_infos)
 155 {
 156     int i;
 157
 158     for (i = 0; i < nr_infos; i++) {
 159         type_register_static(&infos[i]);
 160     }
 161 }
 162
 163 static TypeImpl *type_get_by_name(const char *name)
 164 {
 165     if (name == NULL) {
 166         return NULL;
 167     }
 168
 169     return type_table_lookup(name);
 170 }
 171
 172 static TypeImpl *type_get_parent(TypeImpl *type)
 173 {
 174     if (!type->parent_type && type->parent) {
 175         type->parent_type = type_get_by_name(type->parent);
 176         if (!type->parent_type) {
 177             fprintf(stderr, "Type '%s' is missing its parent '%s'\n",
 178                     type->name, type->parent);
 179             abort();
 180         }
 181     }
 182
 183     return type->parent_type;
 184 }
 185
 186 static bool type_has_parent(TypeImpl *type)
 187 {
 188     return (type->parent != NULL);
 189 }
 190
 191 static size_t type_class_get_size(TypeImpl *ti)
 192 {
 193     if (ti->class_size) {
 194         return ti->class_size;
 195     }
 196
 197     if (type_has_parent(ti)) {
 198         return type_class_get_size(type_get_parent(ti));
 199     }
 200
 201     return sizeof(ObjectClass);
 202 }
 203
 204 static size_t type_object_get_size(TypeImpl *ti)
 205 {
 206     if (ti->instance_size) {
 207         return ti->instance_size;
 208     }
 209
 210     if (type_has_parent(ti)) {
 211         return type_object_get_size(type_get_parent(ti));
 212     }
 213
 214     return 0;
 215 }
 216
 217 size_t object_type_get_instance_size(const char *typename)
 218 {
 219     TypeImpl *type = type_get_by_name(typename);
 220
 221     g_assert(type != NULL);
 222     return type_object_get_size(type);
 223 }
 224
 225 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 226 {
 227     assert(target_type);
 228
 229     /* Check if target_type is a direct ancestor of type */
 230     while (type) {
 231         if (type == target_type) {
 232             return true;
 233         }
 234
 235         type = type_get_parent(type);
 236     }
 237
 238     return false;
 239 }
 240
 241 static void type_initialize(TypeImpl *ti);
 242
 243 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 244                                       TypeImpl *parent_type)
 245 {
 246     InterfaceClass *new_iface;
 247     TypeInfo info = { };
 248     TypeImpl *iface_impl;
 249
 250     info.parent = parent_type->name;
 251     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 252     info.abstract = true;
 253
 254     iface_impl = type_new(&info);
 255     iface_impl->parent_type = parent_type;
 256     type_initialize(iface_impl);
 257     g_free((char *)info.name);
 258
 259     new_iface = (InterfaceClass *)iface_impl->class;
 260     new_iface->concrete_class = ti->class;
 261     new_iface->interface_type = interface_type;
 262
 263     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 264                                            iface_impl->class);
 265 }
 266
 267 static void object_property_free(gpointer data)
 268 {
 269     ObjectProperty *prop = data;
 270
 271     g_free(prop->name);
 272     g_free(prop->type);
 273     g_free(prop->description);
 274     g_free(prop);
 275 }
 276
 277 static void type_initialize(TypeImpl *ti)
 278 {
 279     TypeImpl *parent;
 280
 281     if (ti->class) {
 282         return;
 283     }
 284
 285     ti->class_size = type_class_get_size(ti);
 286     ti->instance_size = type_object_get_size(ti);
 287     /* Any type with zero instance_size is implicitly abstract.
 288      * This means interface types are all abstract.
 289      */
 290     if (ti->instance_size == 0) {
 291         ti->abstract = true;
 292     }
 293     if (type_is_ancestor(ti, type_interface)) {
 294         assert(ti->instance_size == 0);
 295         assert(ti->abstract);
 296         assert(!ti->instance_init);
 297         assert(!ti->instance_post_init);
 298         assert(!ti->instance_finalize);
 299         assert(!ti->num_interfaces);
 300     }
 301     ti->class = g_malloc0(ti->class_size);
 302
 303     parent = type_get_parent(ti);
 304     if (parent) {
 305         type_initialize(parent);
 306         GSList *e;
 307         int i;
 308
 309         g_assert(parent->class_size <= ti->class_size);
 310         g_assert(parent->instance_size <= ti->instance_size);
 311         memcpy(ti->class, parent->class, parent->class_size);
 312         ti->class->interfaces = NULL;
 313         ti->class->properties = g_hash_table_new_full(
 314             g_str_hash, g_str_equal, NULL, object_property_free);
 315
 316         for (e = parent->class->interfaces; e; e = e->next) {
 317             InterfaceClass *iface = e->data;
 318             ObjectClass *klass = OBJECT_CLASS(iface);
 319
 320             type_initialize_interface(ti, iface->interface_type, klass->type);
 321         }
 322
 323         for (i = 0; i < ti->num_interfaces; i++) {
 324             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 325             if (!t) {
 326                 error_report("missing interface '%s' for object '%s'",
 327                              ti->interfaces[i].typename, parent->name);
 328                 abort();
 329             }
 330             for (e = ti->class->interfaces; e; e = e->next) {
 331                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 332
 333                 if (type_is_ancestor(target_type, t)) {
 334                     break;
 335                 }
 336             }
 337
 338             if (e) {
 339                 continue;
 340             }
 341
 342             type_initialize_interface(ti, t, t);
 343         }
 344     } else {
 345         ti->class->properties = g_hash_table_new_full(
 346             g_str_hash, g_str_equal, NULL, object_property_free);
 347     }
 348
 349     ti->class->type = ti;
 350
 351     while (parent) {
 352         if (parent->class_base_init) {
 353             parent->class_base_init(ti->class, ti->class_data);
 354         }
 355         parent = type_get_parent(parent);
 356     }
 357
 358     if (ti->class_init) {
 359         ti->class_init(ti->class, ti->class_data);
 360     }
 361 }
 362
 363 static void object_init_with_type(Object *obj, TypeImpl *ti)
 364 {
 365     if (type_has_parent(ti)) {
 366         object_init_with_type(obj, type_get_parent(ti));
 367     }
 368
 369     if (ti->instance_init) {
 370         ti->instance_init(obj);
 371     }
 372 }
 373
 374 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 375 {
 376     if (ti->instance_post_init) {
 377         ti->instance_post_init(obj);
 378     }
 379
 380     if (type_has_parent(ti)) {
 381         object_post_init_with_type(obj, type_get_parent(ti));
 382     }
 383 }
 384
 385 void object_apply_global_props(Object *obj, const GPtrArray *props, Error **errp)
 386 {
 387     int i;
 388
 389     if (!props) {
 390         return;
 391     }
 392
 393     for (i = 0; i < props->len; i++) {
 394         GlobalProperty *p = g_ptr_array_index(props, i);
 395         Error *err = NULL;
 396
 397         if (object_dynamic_cast(obj, p->driver) == NULL) {
 398             continue;
 399         }
 400         if (p->optional && !object_property_find(obj, p->property, NULL)) {
 401             continue;
 402         }
 403         p->used = true;
 404         object_property_parse(obj, p->value, p->property, &err);
 405         if (err != NULL) {
 406             error_prepend(&err, "can't apply global %s.%s=%s: ",
 407                           p->driver, p->property, p->value);
 408             /*
 409              * If errp != NULL, propagate error and return.
 410              * If errp == NULL, report a warning, but keep going
 411              * with the remaining globals.
 412              */
 413             if (errp) {
 414                 error_propagate(errp, err);
 415                 return;
 416             } else {
 417                 warn_report_err(err);
 418             }
 419         }
 420     }
 421 }
 422
 423 /*
 424  * Global property defaults
 425  * Slot 0: accelerator's global property defaults
 426  * Slot 1: machine's global property defaults
 427  * Slot 2: global properties from legacy command line option
 428  * Each is a GPtrArray of of GlobalProperty.
 429  * Applied in order, later entries override earlier ones.
 430  */
 431 static GPtrArray *object_compat_props[3];
 432
 433 /*
 434  * Retrieve @GPtrArray for global property defined with options
 435  * other than "-global".  These are generally used for syntactic
 436  * sugar and legacy command line options.
 437  */
 438 void object_register_sugar_prop(const char *driver, const char *prop, const char *value)
 439 {
 440     GlobalProperty *g;
 441     if (!object_compat_props[2]) {
 442         object_compat_props[2] = g_ptr_array_new();
 443     }
 444     g = g_new0(GlobalProperty, 1);
 445     g->driver = g_strdup(driver);
 446     g->property = g_strdup(prop);
 447     g->value = g_strdup(value);
 448     g_ptr_array_add(object_compat_props[2], g);
 449 }
 450
 451 /*
 452  * Set machine's global property defaults to @compat_props.
 453  * May be called at most once.
 454  */
 455 void object_set_machine_compat_props(GPtrArray *compat_props)
 456 {
 457     assert(!object_compat_props[1]);
 458     object_compat_props[1] = compat_props;
 459 }
 460
 461 /*
 462  * Set accelerator's global property defaults to @compat_props.
 463  * May be called at most once.
 464  */
 465 void object_set_accelerator_compat_props(GPtrArray *compat_props)
 466 {
 467     assert(!object_compat_props[0]);
 468     object_compat_props[0] = compat_props;
 469 }
 470
 471 void object_apply_compat_props(Object *obj)
 472 {
 473     int i;
 474
 475     for (i = 0; i < ARRAY_SIZE(object_compat_props); i++) {
 476         object_apply_global_props(obj, object_compat_props[i],
 477                                   i == 2 ? &error_fatal : &error_abort);
 478     }
 479 }
 480
 481 static void object_class_property_init_all(Object *obj)
 482 {
 483     ObjectPropertyIterator iter;
 484     ObjectProperty *prop;
 485
 486     object_class_property_iter_init(&iter, object_get_class(obj));
 487     while ((prop = object_property_iter_next(&iter))) {
 488         if (prop->init) {
 489             prop->init(obj, prop);
 490         }
 491     }
 492 }
 493
 494 static void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 495 {
 496     Object *obj = data;
 497
 498     type_initialize(type);
 499
 500     g_assert(type->instance_size >= sizeof(Object));
 501     g_assert(type->abstract == false);
 502     g_assert(size >= type->instance_size);
 503
 504     memset(obj, 0, type->instance_size);
 505     obj->class = type->class;
 506     object_ref(obj);
 507     object_class_property_init_all(obj);
 508     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 509                                             NULL, object_property_free);
 510     object_init_with_type(obj, type);
 511     object_post_init_with_type(obj, type);
 512 }
 513
 514 void object_initialize(void *data, size_t size, const char *typename)
 515 {
 516     TypeImpl *type = type_get_by_name(typename);
 517
 518     if (!type) {
 519         error_report("missing object type '%s'", typename);
 520         abort();
 521     }
 522
 523     object_initialize_with_type(data, size, type);
 524 }
 525
 526 void object_initialize_child(Object *parentobj, const char *propname,
 527                              void *childobj, size_t size, const char *type,
 528                              Error **errp, ...)
 529 {
 530     va_list vargs;
 531
 532     va_start(vargs, errp);
 533     object_initialize_childv(parentobj, propname, childobj, size, type, errp,
 534                              vargs);
 535     va_end(vargs);
 536 }
 537
 538 void object_initialize_childv(Object *parentobj, const char *propname,
 539                               void *childobj, size_t size, const char *type,
 540                               Error **errp, va_list vargs)
 541 {
 542     Error *local_err = NULL;
 543     Object *obj;
 544     UserCreatable *uc;
 545
 546     object_initialize(childobj, size, type);
 547     obj = OBJECT(childobj);
 548
 549     object_set_propv(obj, &local_err, vargs);
 550     if (local_err) {
 551         goto out;
 552     }
 553
 554     object_property_add_child(parentobj, propname, obj, &local_err);
 555     if (local_err) {
 556         goto out;
 557     }
 558
 559     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 560     if (uc) {
 561         user_creatable_complete(uc, &local_err);
 562         if (local_err) {
 563             object_unparent(obj);
 564             goto out;
 565         }
 566     }
 567
 568     /*
 569      * Since object_property_add_child added a reference to the child object,
 570      * we can drop the reference added by object_initialize(), so the child
 571      * property will own the only reference to the object.
 572      */
 573     object_unref(obj);
 574
 575 out:
 576     if (local_err) {
 577         error_propagate(errp, local_err);
 578         object_unref(obj);
 579     }
 580 }
 581
 582 static inline bool object_property_is_child(ObjectProperty *prop)
 583 {
 584     return strstart(prop->type, "child<", NULL);
 585 }
 586
 587 static void object_property_del_all(Object *obj)
 588 {
 589     ObjectProperty *prop;
 590     GHashTableIter iter;
 591     gpointer key, value;
 592     bool released;
 593
 594     do {
 595         released = false;
 596         g_hash_table_iter_init(&iter, obj->properties);
 597         while (g_hash_table_iter_next(&iter, &key, &value)) {
 598             prop = value;
 599             if (prop->release) {
 600                 prop->release(obj, prop->name, prop->opaque);
 601                 prop->release = NULL;
 602                 released = true;
 603                 break;
 604             }
 605             g_hash_table_iter_remove(&iter);
 606         }
 607     } while (released);
 608
 609     g_hash_table_unref(obj->properties);
 610 }
 611
 612 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 613 {
 614     ObjectProperty *prop;
 615     GHashTableIter iter;
 616     gpointer key, value;
 617
 618     g_hash_table_iter_init(&iter, obj->properties);
 619     while (g_hash_table_iter_next(&iter, &key, &value)) {
 620         prop = value;
 621         if (object_property_is_child(prop) && prop->opaque == child) {
 622             if (prop->release) {
 623                 prop->release(obj, prop->name, prop->opaque);
 624                 prop->release = NULL;
 625             }
 626             break;
 627         }
 628     }
 629     g_hash_table_iter_init(&iter, obj->properties);
 630     while (g_hash_table_iter_next(&iter, &key, &value)) {
 631         prop = value;
 632         if (object_property_is_child(prop) && prop->opaque == child) {
 633             g_hash_table_iter_remove(&iter);
 634             break;
 635         }
 636     }
 637 }
 638
 639 void object_unparent(Object *obj)
 640 {
 641     if (obj->parent) {
 642         object_property_del_child(obj->parent, obj, NULL);
 643     }
 644 }
 645
 646 static void object_deinit(Object *obj, TypeImpl *type)
 647 {
 648     if (type->instance_finalize) {
 649         type->instance_finalize(obj);
 650     }
 651
 652     if (type_has_parent(type)) {
 653         object_deinit(obj, type_get_parent(type));
 654     }
 655 }
 656
 657 static void object_finalize(void *data)
 658 {
 659     Object *obj = data;
 660     TypeImpl *ti = obj->class->type;
 661
 662     object_property_del_all(obj);
 663     object_deinit(obj, ti);
 664
 665     g_assert(obj->ref == 0);
 666     if (obj->free) {
 667         obj->free(obj);
 668     }
 669 }
 670
 671 static Object *object_new_with_type(Type type)
 672 {
 673     Object *obj;
 674
 675     g_assert(type != NULL);
 676     type_initialize(type);
 677
 678     obj = g_malloc(type->instance_size);
 679     object_initialize_with_type(obj, type->instance_size, type);
 680     obj->free = g_free;
 681
 682     return obj;
 683 }
 684
 685 Object *object_new_with_class(ObjectClass *klass)
 686 {
 687     return object_new_with_type(klass->type);
 688 }
 689
 690 Object *object_new(const char *typename)
 691 {
 692     TypeImpl *ti = type_get_by_name(typename);
 693
 694     return object_new_with_type(ti);
 695 }
 696
 697
 698 Object *object_new_with_props(const char *typename,
 699                               Object *parent,
 700                               const char *id,
 701                               Error **errp,
 702                               ...)
 703 {
 704     va_list vargs;
 705     Object *obj;
 706
 707     va_start(vargs, errp);
 708     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 709     va_end(vargs);
 710
 711     return obj;
 712 }
 713
 714
 715 Object *object_new_with_propv(const char *typename,
 716                               Object *parent,
 717                               const char *id,
 718                               Error **errp,
 719                               va_list vargs)
 720 {
 721     Object *obj;
 722     ObjectClass *klass;
 723     Error *local_err = NULL;
 724     UserCreatable *uc;
 725
 726     klass = object_class_by_name(typename);
 727     if (!klass) {
 728         error_setg(errp, "invalid object type: %s", typename);
 729         return NULL;
 730     }
 731
 732     if (object_class_is_abstract(klass)) {
 733         error_setg(errp, "object type '%s' is abstract", typename);
 734         return NULL;
 735     }
 736     obj = object_new_with_type(klass->type);
 737
 738     if (object_set_propv(obj, &local_err, vargs) < 0) {
 739         goto error;
 740     }
 741
 742     if (id != NULL) {
 743         object_property_add_child(parent, id, obj, &local_err);
 744         if (local_err) {
 745             goto error;
 746         }
 747     }
 748
 749     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 750     if (uc) {
 751         user_creatable_complete(uc, &local_err);
 752         if (local_err) {
 753             if (id != NULL) {
 754                 object_unparent(obj);
 755             }
 756             goto error;
 757         }
 758     }
 759
 760     object_unref(OBJECT(obj));
 761     return obj;
 762
 763  error:
 764     error_propagate(errp, local_err);
 765     object_unref(obj);
 766     return NULL;
 767 }
 768
 769
 770 int object_set_props(Object *obj,
 771                      Error **errp,
 772                      ...)
 773 {
 774     va_list vargs;
 775     int ret;
 776
 777     va_start(vargs, errp);
 778     ret = object_set_propv(obj, errp, vargs);
 779     va_end(vargs);
 780
 781     return ret;
 782 }
 783
 784
 785 int object_set_propv(Object *obj,
 786                      Error **errp,
 787                      va_list vargs)
 788 {
 789     const char *propname;
 790     Error *local_err = NULL;
 791
 792     propname = va_arg(vargs, char *);
 793     while (propname != NULL) {
 794         const char *value = va_arg(vargs, char *);
 795
 796         g_assert(value != NULL);
 797         object_property_parse(obj, value, propname, &local_err);
 798         if (local_err) {
 799             error_propagate(errp, local_err);
 800             return -1;
 801         }
 802         propname = va_arg(vargs, char *);
 803     }
 804
 805     return 0;
 806 }
 807
 808
 809 Object *object_dynamic_cast(Object *obj, const char *typename)
 810 {
 811     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 812         return obj;
 813     }
 814
 815     return NULL;
 816 }
 817
 818 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 819                                    const char *file, int line, const char *func)
 820 {
 821     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 822                                      typename, file, line, func);
 823
 824 #ifdef CONFIG_QOM_CAST_DEBUG
 825     int i;
 826     Object *inst;
 827
 828     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 829         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 830             goto out;
 831         }
 832     }
 833
 834     inst = object_dynamic_cast(obj, typename);
 835
 836     if (!inst && obj) {
 837         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 838                 file, line, func, obj, typename);
 839         abort();
 840     }
 841
 842     assert(obj == inst);
 843
 844     if (obj && obj == inst) {
 845         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 846             atomic_set(&obj->class->object_cast_cache[i - 1],
 847                        atomic_read(&obj->class->object_cast_cache[i]));
 848         }
 849         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 850     }
 851
 852 out:
 853 #endif
 854     return obj;
 855 }
 856
 857 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 858                                        const char *typename)
 859 {
 860     ObjectClass *ret = NULL;
 861     TypeImpl *target_type;
 862     TypeImpl *type;
 863
 864     if (!class) {
 865         return NULL;
 866     }
 867
 868     /* A simple fast path that can trigger a lot for leaf classes.  */
 869     type = class->type;
 870     if (type->name == typename) {
 871         return class;
 872     }
 873
 874     target_type = type_get_by_name(typename);
 875     if (!target_type) {
 876         /* target class type unknown, so fail the cast */
 877         return NULL;
 878     }
 879
 880     if (type->class->interfaces &&
 881             type_is_ancestor(target_type, type_interface)) {
 882         int found = 0;
 883         GSList *i;
 884
 885         for (i = class->interfaces; i; i = i->next) {
 886             ObjectClass *target_class = i->data;
 887
 888             if (type_is_ancestor(target_class->type, target_type)) {
 889                 ret = target_class;
 890                 found++;
 891             }
 892          }
 893
 894         /* The match was ambiguous, don't allow a cast */
 895         if (found > 1) {
 896             ret = NULL;
 897         }
 898     } else if (type_is_ancestor(type, target_type)) {
 899         ret = class;
 900     }
 901
 902     return ret;
 903 }
 904
 905 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 906                                               const char *typename,
 907                                               const char *file, int line,
 908                                               const char *func)
 909 {
 910     ObjectClass *ret;
 911
 912     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 913                                            typename, file, line, func);
 914
 915 #ifdef CONFIG_QOM_CAST_DEBUG
 916     int i;
 917
 918     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 919         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 920             ret = class;
 921             goto out;
 922         }
 923     }
 924 #else
 925     if (!class || !class->interfaces) {
 926         return class;
 927     }
 928 #endif
 929
 930     ret = object_class_dynamic_cast(class, typename);
 931     if (!ret && class) {
 932         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 933                 file, line, func, class, typename);
 934         abort();
 935     }
 936
 937 #ifdef CONFIG_QOM_CAST_DEBUG
 938     if (class && ret == class) {
 939         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 940             atomic_set(&class->class_cast_cache[i - 1],
 941                        atomic_read(&class->class_cast_cache[i]));
 942         }
 943         atomic_set(&class->class_cast_cache[i - 1], typename);
 944     }
 945 out:
 946 #endif
 947     return ret;
 948 }
 949
 950 const char *object_get_typename(const Object *obj)
 951 {
 952     return obj->class->type->name;
 953 }
 954
 955 ObjectClass *object_get_class(Object *obj)
 956 {
 957     return obj->class;
 958 }
 959
 960 bool object_class_is_abstract(ObjectClass *klass)
 961 {
 962     return klass->type->abstract;
 963 }
 964
 965 const char *object_class_get_name(ObjectClass *klass)
 966 {
 967     return klass->type->name;
 968 }
 969
 970 ObjectClass *object_class_by_name(const char *typename)
 971 {
 972     TypeImpl *type = type_get_by_name(typename);
 973
 974     if (!type) {
 975         return NULL;
 976     }
 977
 978     type_initialize(type);
 979
 980     return type->class;
 981 }
 982
 983 ObjectClass *object_class_get_parent(ObjectClass *class)
 984 {
 985     TypeImpl *type = type_get_parent(class->type);
 986
 987     if (!type) {
 988         return NULL;
 989     }
 990
 991     type_initialize(type);
 992
 993     return type->class;
 994 }
 995
 996 typedef struct OCFData
 997 {
 998     void (*fn)(ObjectClass *klass, void *opaque);
 999     const char *implements_type;
1000     bool include_abstract;
1001     void *opaque;
1002 } OCFData;
1003
1004 static void object_class_foreach_tramp(gpointer key, gpointer value,
1005                                        gpointer opaque)
1006 {
1007     OCFData *data = opaque;
1008     TypeImpl *type = value;
1009     ObjectClass *k;
1010
1011     type_initialize(type);
1012     k = type->class;
1013
1014     if (!data->include_abstract && type->abstract) {
1015         return;
1016     }
1017
1018     if (data->implements_type &&
1019         !object_class_dynamic_cast(k, data->implements_type)) {
1020         return;
1021     }
1022
1023     data->fn(k, data->opaque);
1024 }
1025
1026 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
1027                           const char *implements_type, bool include_abstract,
1028                           void *opaque)
1029 {
1030     OCFData data = { fn, implements_type, include_abstract, opaque };
1031
1032     enumerating_types = true;
1033     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
1034     enumerating_types = false;
1035 }
1036
1037 static int do_object_child_foreach(Object *obj,
1038                                    int (*fn)(Object *child, void *opaque),
1039                                    void *opaque, bool recurse)
1040 {
1041     GHashTableIter iter;
1042     ObjectProperty *prop;
1043     int ret = 0;
1044
1045     g_hash_table_iter_init(&iter, obj->properties);
1046     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1047         if (object_property_is_child(prop)) {
1048             Object *child = prop->opaque;
1049
1050             ret = fn(child, opaque);
1051             if (ret != 0) {
1052                 break;
1053             }
1054             if (recurse) {
1055                 do_object_child_foreach(child, fn, opaque, true);
1056             }
1057         }
1058     }
1059     return ret;
1060 }
1061
1062 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
1063                          void *opaque)
1064 {
1065     return do_object_child_foreach(obj, fn, opaque, false);
1066 }
1067
1068 int object_child_foreach_recursive(Object *obj,
1069                                    int (*fn)(Object *child, void *opaque),
1070                                    void *opaque)
1071 {
1072     return do_object_child_foreach(obj, fn, opaque, true);
1073 }
1074
1075 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
1076 {
1077     GSList **list = opaque;
1078
1079     *list = g_slist_prepend(*list, klass);
1080 }
1081
1082 GSList *object_class_get_list(const char *implements_type,
1083                               bool include_abstract)
1084 {
1085     GSList *list = NULL;
1086
1087     object_class_foreach(object_class_get_list_tramp,
1088                          implements_type, include_abstract, &list);
1089     return list;
1090 }
1091
1092 static gint object_class_cmp(gconstpointer a, gconstpointer b)
1093 {
1094     return strcasecmp(object_class_get_name((ObjectClass *)a),
1095                       object_class_get_name((ObjectClass *)b));
1096 }
1097
1098 GSList *object_class_get_list_sorted(const char *implements_type,
1099                                      bool include_abstract)
1100 {
1101     return g_slist_sort(object_class_get_list(implements_type, include_abstract),
1102                         object_class_cmp);
1103 }
1104
1105 void object_ref(Object *obj)
1106 {
1107     if (!obj) {
1108         return;
1109     }
1110     atomic_inc(&obj->ref);
1111 }
1112
1113 void object_unref(Object *obj)
1114 {
1115     if (!obj) {
1116         return;
1117     }
1118     g_assert(obj->ref > 0);
1119
1120     /* parent always holds a reference to its children */
1121     if (atomic_fetch_dec(&obj->ref) == 1) {
1122         object_finalize(obj);
1123     }
1124 }
1125
1126 ObjectProperty *
1127 object_property_add(Object *obj, const char *name, const char *type,
1128                     ObjectPropertyAccessor *get,
1129                     ObjectPropertyAccessor *set,
1130                     ObjectPropertyRelease *release,
1131                     void *opaque, Error **errp)
1132 {
1133     ObjectProperty *prop;
1134     size_t name_len = strlen(name);
1135
1136     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
1137         int i;
1138         ObjectProperty *ret;
1139         char *name_no_array = g_strdup(name);
1140
1141         name_no_array[name_len - 3] = '\0';
1142         for (i = 0; ; ++i) {
1143             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
1144
1145             ret = object_property_add(obj, full_name, type, get, set,
1146                                       release, opaque, NULL);
1147             g_free(full_name);
1148             if (ret) {
1149                 break;
1150             }
1151         }
1152         g_free(name_no_array);
1153         return ret;
1154     }
1155
1156     if (object_property_find(obj, name, NULL) != NULL) {
1157         error_setg(errp, "attempt to add duplicate property '%s' to object (type '%s')",
1158                    name, object_get_typename(obj));
1159         return NULL;
1160     }
1161
1162     prop = g_malloc0(sizeof(*prop));
1163
1164     prop->name = g_strdup(name);
1165     prop->type = g_strdup(type);
1166
1167     prop->get = get;
1168     prop->set = set;
1169     prop->release = release;
1170     prop->opaque = opaque;
1171
1172     g_hash_table_insert(obj->properties, prop->name, prop);
1173     return prop;
1174 }
1175
1176 ObjectProperty *
1177 object_class_property_add(ObjectClass *klass,
1178                           const char *name,
1179                           const char *type,
1180                           ObjectPropertyAccessor *get,
1181                           ObjectPropertyAccessor *set,
1182                           ObjectPropertyRelease *release,
1183                           void *opaque,
1184                           Error **errp)
1185 {
1186     ObjectProperty *prop;
1187
1188     if (object_class_property_find(klass, name, NULL) != NULL) {
1189         error_setg(errp, "attempt to add duplicate property '%s' to class (type '%s')",
1190                    name, object_class_get_name(klass));
1191         return NULL;
1192     }
1193
1194     prop = g_malloc0(sizeof(*prop));
1195
1196     prop->name = g_strdup(name);
1197     prop->type = g_strdup(type);
1198
1199     prop->get = get;
1200     prop->set = set;
1201     prop->release = release;
1202     prop->opaque = opaque;
1203
1204     g_hash_table_insert(klass->properties, prop->name, prop);
1205
1206     return prop;
1207 }
1208
1209 ObjectProperty *object_property_find(Object *obj, const char *name,
1210                                      Error **errp)
1211 {
1212     ObjectProperty *prop;
1213     ObjectClass *klass = object_get_class(obj);
1214
1215     prop = object_class_property_find(klass, name, NULL);
1216     if (prop) {
1217         return prop;
1218     }
1219
1220     prop = g_hash_table_lookup(obj->properties, name);
1221     if (prop) {
1222         return prop;
1223     }
1224
1225     error_setg(errp, "Property '.%s' not found", name);
1226     return NULL;
1227 }
1228
1229 void object_property_iter_init(ObjectPropertyIterator *iter,
1230                                Object *obj)
1231 {
1232     g_hash_table_iter_init(&iter->iter, obj->properties);
1233     iter->nextclass = object_get_class(obj);
1234 }
1235
1236 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1237 {
1238     gpointer key, val;
1239     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1240         if (!iter->nextclass) {
1241             return NULL;
1242         }
1243         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1244         iter->nextclass = object_class_get_parent(iter->nextclass);
1245     }
1246     return val;
1247 }
1248
1249 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1250                                      ObjectClass *klass)
1251 {
1252     g_hash_table_iter_init(&iter->iter, klass->properties);
1253     iter->nextclass = object_class_get_parent(klass);
1254 }
1255
1256 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1257                                            Error **errp)
1258 {
1259     ObjectProperty *prop;
1260     ObjectClass *parent_klass;
1261
1262     parent_klass = object_class_get_parent(klass);
1263     if (parent_klass) {
1264         prop = object_class_property_find(parent_klass, name, NULL);
1265         if (prop) {
1266             return prop;
1267         }
1268     }
1269
1270     prop = g_hash_table_lookup(klass->properties, name);
1271     if (!prop) {
1272         error_setg(errp, "Property '.%s' not found", name);
1273     }
1274     return prop;
1275 }
1276
1277 void object_property_del(Object *obj, const char *name, Error **errp)
1278 {
1279     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1280
1281     if (!prop) {
1282         error_setg(errp, "Property '.%s' not found", name);
1283         return;
1284     }
1285
1286     if (prop->release) {
1287         prop->release(obj, name, prop->opaque);
1288     }
1289     g_hash_table_remove(obj->properties, name);
1290 }
1291
1292 void object_property_get(Object *obj, Visitor *v, const char *name,
1293                          Error **errp)
1294 {
1295     ObjectProperty *prop = object_property_find(obj, name, errp);
1296     if (prop == NULL) {
1297         return;
1298     }
1299
1300     if (!prop->get) {
1301         error_setg(errp, QERR_PERMISSION_DENIED);
1302     } else {
1303         prop->get(obj, v, name, prop->opaque, errp);
1304     }
1305 }
1306
1307 void object_property_set(Object *obj, Visitor *v, const char *name,
1308                          Error **errp)
1309 {
1310     ObjectProperty *prop = object_property_find(obj, name, errp);
1311     if (prop == NULL) {
1312         return;
1313     }
1314
1315     if (!prop->set) {
1316         error_setg(errp, QERR_PERMISSION_DENIED);
1317     } else {
1318         prop->set(obj, v, name, prop->opaque, errp);
1319     }
1320 }
1321
1322 void object_property_set_str(Object *obj, const char *value,
1323                              const char *name, Error **errp)
1324 {
1325     QString *qstr = qstring_from_str(value);
1326     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1327
1328     qobject_unref(qstr);
1329 }
1330
1331 char *object_property_get_str(Object *obj, const char *name,
1332                               Error **errp)
1333 {
1334     QObject *ret = object_property_get_qobject(obj, name, errp);
1335     char *retval;
1336
1337     if (!ret) {
1338         return NULL;
1339     }
1340
1341     retval = g_strdup(qobject_get_try_str(ret));
1342     if (!retval) {
1343         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1344     }
1345
1346     qobject_unref(ret);
1347     return retval;
1348 }
1349
1350 void object_property_set_link(Object *obj, Object *value,
1351                               const char *name, Error **errp)
1352 {
1353     if (value) {
1354         gchar *path = object_get_canonical_path(value);
1355         object_property_set_str(obj, path, name, errp);
1356         g_free(path);
1357     } else {
1358         object_property_set_str(obj, "", name, errp);
1359     }
1360 }
1361
1362 Object *object_property_get_link(Object *obj, const char *name,
1363                                  Error **errp)
1364 {
1365     char *str = object_property_get_str(obj, name, errp);
1366     Object *target = NULL;
1367
1368     if (str && *str) {
1369         target = object_resolve_path(str, NULL);
1370         if (!target) {
1371             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1372                       "Device '%s' not found", str);
1373         }
1374     }
1375
1376     g_free(str);
1377     return target;
1378 }
1379
1380 void object_property_set_bool(Object *obj, bool value,
1381                               const char *name, Error **errp)
1382 {
1383     QBool *qbool = qbool_from_bool(value);
1384     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1385
1386     qobject_unref(qbool);
1387 }
1388
1389 bool object_property_get_bool(Object *obj, const char *name,
1390                               Error **errp)
1391 {
1392     QObject *ret = object_property_get_qobject(obj, name, errp);
1393     QBool *qbool;
1394     bool retval;
1395
1396     if (!ret) {
1397         return false;
1398     }
1399     qbool = qobject_to(QBool, ret);
1400     if (!qbool) {
1401         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1402         retval = false;
1403     } else {
1404         retval = qbool_get_bool(qbool);
1405     }
1406
1407     qobject_unref(ret);
1408     return retval;
1409 }
1410
1411 void object_property_set_int(Object *obj, int64_t value,
1412                              const char *name, Error **errp)
1413 {
1414     QNum *qnum = qnum_from_int(value);
1415     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1416
1417     qobject_unref(qnum);
1418 }
1419
1420 int64_t object_property_get_int(Object *obj, const char *name,
1421                                 Error **errp)
1422 {
1423     QObject *ret = object_property_get_qobject(obj, name, errp);
1424     QNum *qnum;
1425     int64_t retval;
1426
1427     if (!ret) {
1428         return -1;
1429     }
1430
1431     qnum = qobject_to(QNum, ret);
1432     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1433         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1434         retval = -1;
1435     }
1436
1437     qobject_unref(ret);
1438     return retval;
1439 }
1440
1441 void object_property_set_uint(Object *obj, uint64_t value,
1442                               const char *name, Error **errp)
1443 {
1444     QNum *qnum = qnum_from_uint(value);
1445
1446     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1447     qobject_unref(qnum);
1448 }
1449
1450 uint64_t object_property_get_uint(Object *obj, const char *name,
1451                                   Error **errp)
1452 {
1453     QObject *ret = object_property_get_qobject(obj, name, errp);
1454     QNum *qnum;
1455     uint64_t retval;
1456
1457     if (!ret) {
1458         return 0;
1459     }
1460     qnum = qobject_to(QNum, ret);
1461     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1462         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1463         retval = 0;
1464     }
1465
1466     qobject_unref(ret);
1467     return retval;
1468 }
1469
1470 typedef struct EnumProperty {
1471     const QEnumLookup *lookup;
1472     int (*get)(Object *, Error **);
1473     void (*set)(Object *, int, Error **);
1474 } EnumProperty;
1475
1476 int object_property_get_enum(Object *obj, const char *name,
1477                              const char *typename, Error **errp)
1478 {
1479     Error *err = NULL;
1480     Visitor *v;
1481     char *str;
1482     int ret;
1483     ObjectProperty *prop = object_property_find(obj, name, errp);
1484     EnumProperty *enumprop;
1485
1486     if (prop == NULL) {
1487         return 0;
1488     }
1489
1490     if (!g_str_equal(prop->type, typename)) {
1491         error_setg(errp, "Property %s on %s is not '%s' enum type",
1492                    name, object_class_get_name(
1493                        object_get_class(obj)), typename);
1494         return 0;
1495     }
1496
1497     enumprop = prop->opaque;
1498
1499     v = string_output_visitor_new(false, &str);
1500     object_property_get(obj, v, name, &err);
1501     if (err) {
1502         error_propagate(errp, err);
1503         visit_free(v);
1504         return 0;
1505     }
1506     visit_complete(v, &str);
1507     visit_free(v);
1508     v = string_input_visitor_new(str);
1509     visit_type_enum(v, name, &ret, enumprop->lookup, errp);
1510
1511     g_free(str);
1512     visit_free(v);
1513
1514     return ret;
1515 }
1516
1517 void object_property_get_uint16List(Object *obj, const char *name,
1518                                     uint16List **list, Error **errp)
1519 {
1520     Error *err = NULL;
1521     Visitor *v;
1522     char *str;
1523
1524     v = string_output_visitor_new(false, &str);
1525     object_property_get(obj, v, name, &err);
1526     if (err) {
1527         error_propagate(errp, err);
1528         goto out;
1529     }
1530     visit_complete(v, &str);
1531     visit_free(v);
1532     v = string_input_visitor_new(str);
1533     visit_type_uint16List(v, NULL, list, errp);
1534
1535     g_free(str);
1536 out:
1537     visit_free(v);
1538 }
1539
1540 void object_property_parse(Object *obj, const char *string,
1541                            const char *name, Error **errp)
1542 {
1543     Visitor *v = string_input_visitor_new(string);
1544     object_property_set(obj, v, name, errp);
1545     visit_free(v);
1546 }
1547
1548 char *object_property_print(Object *obj, const char *name, bool human,
1549                             Error **errp)
1550 {
1551     Visitor *v;
1552     char *string = NULL;
1553     Error *local_err = NULL;
1554
1555     v = string_output_visitor_new(human, &string);
1556     object_property_get(obj, v, name, &local_err);
1557     if (local_err) {
1558         error_propagate(errp, local_err);
1559         goto out;
1560     }
1561
1562     visit_complete(v, &string);
1563
1564 out:
1565     visit_free(v);
1566     return string;
1567 }
1568
1569 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1570 {
1571     ObjectProperty *prop = object_property_find(obj, name, errp);
1572     if (prop == NULL) {
1573         return NULL;
1574     }
1575
1576     return prop->type;
1577 }
1578
1579 Object *object_get_root(void)
1580 {
1581     static Object *root;
1582
1583     if (!root) {
1584         root = object_new("container");
1585     }
1586
1587     return root;
1588 }
1589
1590 Object *object_get_objects_root(void)
1591 {
1592     return container_get(object_get_root(), "/objects");
1593 }
1594
1595 Object *object_get_internal_root(void)
1596 {
1597     static Object *internal_root;
1598
1599     if (!internal_root) {
1600         internal_root = object_new("container");
1601     }
1602
1603     return internal_root;
1604 }
1605
1606 static void object_get_child_property(Object *obj, Visitor *v,
1607                                       const char *name, void *opaque,
1608                                       Error **errp)
1609 {
1610     Object *child = opaque;
1611     gchar *path;
1612
1613     path = object_get_canonical_path(child);
1614     visit_type_str(v, name, &path, errp);
1615     g_free(path);
1616 }
1617
1618 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1619 {
1620     return opaque;
1621 }
1622
1623 static void object_finalize_child_property(Object *obj, const char *name,
1624                                            void *opaque)
1625 {
1626     Object *child = opaque;
1627
1628     if (child->class->unparent) {
1629         (child->class->unparent)(child);
1630     }
1631     child->parent = NULL;
1632     object_unref(child);
1633 }
1634
1635 void object_property_add_child(Object *obj, const char *name,
1636                                Object *child, Error **errp)
1637 {
1638     Error *local_err = NULL;
1639     gchar *type;
1640     ObjectProperty *op;
1641
1642     if (child->parent != NULL) {
1643         error_setg(errp, "child object is already parented");
1644         return;
1645     }
1646
1647     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1648
1649     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1650                              object_finalize_child_property, child, &local_err);
1651     if (local_err) {
1652         error_propagate(errp, local_err);
1653         goto out;
1654     }
1655
1656     op->resolve = object_resolve_child_property;
1657     object_ref(child);
1658     child->parent = obj;
1659
1660 out:
1661     g_free(type);
1662 }
1663
1664 void object_property_allow_set_link(const Object *obj, const char *name,
1665                                     Object *val, Error **errp)
1666 {
1667     /* Allow the link to be set, always */
1668 }
1669
1670 typedef struct {
1671     Object **child;
1672     void (*check)(const Object *, const char *, Object *, Error **);
1673     ObjectPropertyLinkFlags flags;
1674 } LinkProperty;
1675
1676 static void object_get_link_property(Object *obj, Visitor *v,
1677                                      const char *name, void *opaque,
1678                                      Error **errp)
1679 {
1680     LinkProperty *lprop = opaque;
1681     Object **child = lprop->child;
1682     gchar *path;
1683
1684     if (*child) {
1685         path = object_get_canonical_path(*child);
1686         visit_type_str(v, name, &path, errp);
1687         g_free(path);
1688     } else {
1689         path = (gchar *)"";
1690         visit_type_str(v, name, &path, errp);
1691     }
1692 }
1693
1694 /*
1695  * object_resolve_link:
1696  *
1697  * Lookup an object and ensure its type matches the link property type.  This
1698  * is similar to object_resolve_path() except type verification against the
1699  * link property is performed.
1700  *
1701  * Returns: The matched object or NULL on path lookup failures.
1702  */
1703 static Object *object_resolve_link(Object *obj, const char *name,
1704                                    const char *path, Error **errp)
1705 {
1706     const char *type;
1707     gchar *target_type;
1708     bool ambiguous = false;
1709     Object *target;
1710
1711     /* Go from link<FOO> to FOO.  */
1712     type = object_property_get_type(obj, name, NULL);
1713     target_type = g_strndup(&type[5], strlen(type) - 6);
1714     target = object_resolve_path_type(path, target_type, &ambiguous);
1715
1716     if (ambiguous) {
1717         error_setg(errp, "Path '%s' does not uniquely identify an object",
1718                    path);
1719     } else if (!target) {
1720         target = object_resolve_path(path, &ambiguous);
1721         if (target || ambiguous) {
1722             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1723         } else {
1724             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1725                       "Device '%s' not found", path);
1726         }
1727         target = NULL;
1728     }
1729     g_free(target_type);
1730
1731     return target;
1732 }
1733
1734 static void object_set_link_property(Object *obj, Visitor *v,
1735                                      const char *name, void *opaque,
1736                                      Error **errp)
1737 {
1738     Error *local_err = NULL;
1739     LinkProperty *prop = opaque;
1740     Object **child = prop->child;
1741     Object *old_target = *child;
1742     Object *new_target = NULL;
1743     char *path = NULL;
1744
1745     visit_type_str(v, name, &path, &local_err);
1746
1747     if (!local_err && strcmp(path, "") != 0) {
1748         new_target = object_resolve_link(obj, name, path, &local_err);
1749     }
1750
1751     g_free(path);
1752     if (local_err) {
1753         error_propagate(errp, local_err);
1754         return;
1755     }
1756
1757     prop->check(obj, name, new_target, &local_err);
1758     if (local_err) {
1759         error_propagate(errp, local_err);
1760         return;
1761     }
1762
1763     *child = new_target;
1764     if (prop->flags == OBJ_PROP_LINK_STRONG) {
1765         object_ref(new_target);
1766         object_unref(old_target);
1767     }
1768 }
1769
1770 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1771 {
1772     LinkProperty *lprop = opaque;
1773
1774     return *lprop->child;
1775 }
1776
1777 static void object_release_link_property(Object *obj, const char *name,
1778                                          void *opaque)
1779 {
1780     LinkProperty *prop = opaque;
1781
1782     if ((prop->flags & OBJ_PROP_LINK_STRONG) && *prop->child) {
1783         object_unref(*prop->child);
1784     }
1785     g_free(prop);
1786 }
1787
1788 void object_property_add_link(Object *obj, const char *name,
1789                               const char *type, Object **child,
1790                               void (*check)(const Object *, const char *,
1791                                             Object *, Error **),
1792                               ObjectPropertyLinkFlags flags,
1793                               Error **errp)
1794 {
1795     Error *local_err = NULL;
1796     LinkProperty *prop = g_malloc(sizeof(*prop));
1797     gchar *full_type;
1798     ObjectProperty *op;
1799
1800     prop->child = child;
1801     prop->check = check;
1802     prop->flags = flags;
1803
1804     full_type = g_strdup_printf("link<%s>", type);
1805
1806     op = object_property_add(obj, name, full_type,
1807                              object_get_link_property,
1808                              check ? object_set_link_property : NULL,
1809                              object_release_link_property,
1810                              prop,
1811                              &local_err);
1812     if (local_err) {
1813         error_propagate(errp, local_err);
1814         g_free(prop);
1815         goto out;
1816     }
1817
1818     op->resolve = object_resolve_link_property;
1819
1820 out:
1821     g_free(full_type);
1822 }
1823
1824 void object_property_add_const_link(Object *obj, const char *name,
1825                                     Object *target, Error **errp)
1826 {
1827     char *link_type;
1828     ObjectProperty *op;
1829
1830     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1831     op = object_property_add(obj, name, link_type,
1832                              object_get_child_property, NULL,
1833                              NULL, target, errp);
1834     if (op != NULL) {
1835         op->resolve = object_resolve_child_property;
1836     }
1837     g_free(link_type);
1838 }
1839
1840 gchar *object_get_canonical_path_component(Object *obj)
1841 {
1842     ObjectProperty *prop = NULL;
1843     GHashTableIter iter;
1844
1845     if (obj->parent == NULL) {
1846         return NULL;
1847     }
1848
1849     g_hash_table_iter_init(&iter, obj->parent->properties);
1850     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1851         if (!object_property_is_child(prop)) {
1852             continue;
1853         }
1854
1855         if (prop->opaque == obj) {
1856             return g_strdup(prop->name);
1857         }
1858     }
1859
1860     /* obj had a parent but was not a child, should never happen */
1861     g_assert_not_reached();
1862     return NULL;
1863 }
1864
1865 gchar *object_get_canonical_path(Object *obj)
1866 {
1867     Object *root = object_get_root();
1868     char *newpath, *path = NULL;
1869
1870     if (obj == root) {
1871         return g_strdup("/");
1872     }
1873
1874     do {
1875         char *component = object_get_canonical_path_component(obj);
1876
1877         if (!component) {
1878             /* A canonical path must be complete, so discard what was
1879              * collected so far.
1880              */
1881             g_free(path);
1882             return NULL;
1883         }
1884
1885         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
1886         g_free(path);
1887         g_free(component);
1888         path = newpath;
1889         obj = obj->parent;
1890     } while (obj != root);
1891
1892     return path;
1893 }
1894
1895 Object *object_resolve_path_component(Object *parent, const gchar *part)
1896 {
1897     ObjectProperty *prop = object_property_find(parent, part, NULL);
1898     if (prop == NULL) {
1899         return NULL;
1900     }
1901
1902     if (prop->resolve) {
1903         return prop->resolve(parent, prop->opaque, part);
1904     } else {
1905         return NULL;
1906     }
1907 }
1908
1909 static Object *object_resolve_abs_path(Object *parent,
1910                                           gchar **parts,
1911                                           const char *typename,
1912                                           int index)
1913 {
1914     Object *child;
1915
1916     if (parts[index] == NULL) {
1917         return object_dynamic_cast(parent, typename);
1918     }
1919
1920     if (strcmp(parts[index], "") == 0) {
1921         return object_resolve_abs_path(parent, parts, typename, index + 1);
1922     }
1923
1924     child = object_resolve_path_component(parent, parts[index]);
1925     if (!child) {
1926         return NULL;
1927     }
1928
1929     return object_resolve_abs_path(child, parts, typename, index + 1);
1930 }
1931
1932 static Object *object_resolve_partial_path(Object *parent,
1933                                               gchar **parts,
1934                                               const char *typename,
1935                                               bool *ambiguous)
1936 {
1937     Object *obj;
1938     GHashTableIter iter;
1939     ObjectProperty *prop;
1940
1941     obj = object_resolve_abs_path(parent, parts, typename, 0);
1942
1943     g_hash_table_iter_init(&iter, parent->properties);
1944     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1945         Object *found;
1946
1947         if (!object_property_is_child(prop)) {
1948             continue;
1949         }
1950
1951         found = object_resolve_partial_path(prop->opaque, parts,
1952                                             typename, ambiguous);
1953         if (found) {
1954             if (obj) {
1955                 *ambiguous = true;
1956                 return NULL;
1957             }
1958             obj = found;
1959         }
1960
1961         if (*ambiguous) {
1962             return NULL;
1963         }
1964     }
1965
1966     return obj;
1967 }
1968
1969 Object *object_resolve_path_type(const char *path, const char *typename,
1970                                  bool *ambiguousp)
1971 {
1972     Object *obj;
1973     gchar **parts;
1974
1975     parts = g_strsplit(path, "/", 0);
1976     assert(parts);
1977
1978     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1979         bool ambiguous = false;
1980         obj = object_resolve_partial_path(object_get_root(), parts,
1981                                           typename, &ambiguous);
1982         if (ambiguousp) {
1983             *ambiguousp = ambiguous;
1984         }
1985     } else {
1986         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1987     }
1988
1989     g_strfreev(parts);
1990
1991     return obj;
1992 }
1993
1994 Object *object_resolve_path(const char *path, bool *ambiguous)
1995 {
1996     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1997 }
1998
1999 typedef struct StringProperty
2000 {
2001     char *(*get)(Object *, Error **);
2002     void (*set)(Object *, const char *, Error **);
2003 } StringProperty;
2004
2005 static void property_get_str(Object *obj, Visitor *v, const char *name,
2006                              void *opaque, Error **errp)
2007 {
2008     StringProperty *prop = opaque;
2009     char *value;
2010     Error *err = NULL;
2011
2012     value = prop->get(obj, &err);
2013     if (err) {
2014         error_propagate(errp, err);
2015         return;
2016     }
2017
2018     visit_type_str(v, name, &value, errp);
2019     g_free(value);
2020 }
2021
2022 static void property_set_str(Object *obj, Visitor *v, const char *name,
2023                              void *opaque, Error **errp)
2024 {
2025     StringProperty *prop = opaque;
2026     char *value;
2027     Error *local_err = NULL;
2028
2029     visit_type_str(v, name, &value, &local_err);
2030     if (local_err) {
2031         error_propagate(errp, local_err);
2032         return;
2033     }
2034
2035     prop->set(obj, value, errp);
2036     g_free(value);
2037 }
2038
2039 static void property_release_str(Object *obj, const char *name,
2040                                  void *opaque)
2041 {
2042     StringProperty *prop = opaque;
2043     g_free(prop);
2044 }
2045
2046 void object_property_add_str(Object *obj, const char *name,
2047                            char *(*get)(Object *, Error **),
2048                            void (*set)(Object *, const char *, Error **),
2049                            Error **errp)
2050 {
2051     Error *local_err = NULL;
2052     StringProperty *prop = g_malloc0(sizeof(*prop));
2053
2054     prop->get = get;
2055     prop->set = set;
2056
2057     object_property_add(obj, name, "string",
2058                         get ? property_get_str : NULL,
2059                         set ? property_set_str : NULL,
2060                         property_release_str,
2061                         prop, &local_err);
2062     if (local_err) {
2063         error_propagate(errp, local_err);
2064         g_free(prop);
2065     }
2066 }
2067
2068 void object_class_property_add_str(ObjectClass *klass, const char *name,
2069                                    char *(*get)(Object *, Error **),
2070                                    void (*set)(Object *, const char *,
2071                                                Error **),
2072                                    Error **errp)
2073 {
2074     Error *local_err = NULL;
2075     StringProperty *prop = g_malloc0(sizeof(*prop));
2076
2077     prop->get = get;
2078     prop->set = set;
2079
2080     object_class_property_add(klass, name, "string",
2081                               get ? property_get_str : NULL,
2082                               set ? property_set_str : NULL,
2083                               property_release_str,
2084                               prop, &local_err);
2085     if (local_err) {
2086         error_propagate(errp, local_err);
2087         g_free(prop);
2088     }
2089 }
2090
2091 typedef struct BoolProperty
2092 {
2093     bool (*get)(Object *, Error **);
2094     void (*set)(Object *, bool, Error **);
2095 } BoolProperty;
2096
2097 static void property_get_bool(Object *obj, Visitor *v, const char *name,
2098                               void *opaque, Error **errp)
2099 {
2100     BoolProperty *prop = opaque;
2101     bool value;
2102     Error *err = NULL;
2103
2104     value = prop->get(obj, &err);
2105     if (err) {
2106         error_propagate(errp, err);
2107         return;
2108     }
2109
2110     visit_type_bool(v, name, &value, errp);
2111 }
2112
2113 static void property_set_bool(Object *obj, Visitor *v, const char *name,
2114                               void *opaque, Error **errp)
2115 {
2116     BoolProperty *prop = opaque;
2117     bool value;
2118     Error *local_err = NULL;
2119
2120     visit_type_bool(v, name, &value, &local_err);
2121     if (local_err) {
2122         error_propagate(errp, local_err);
2123         return;
2124     }
2125
2126     prop->set(obj, value, errp);
2127 }
2128
2129 static void property_release_bool(Object *obj, const char *name,
2130                                   void *opaque)
2131 {
2132     BoolProperty *prop = opaque;
2133     g_free(prop);
2134 }
2135
2136 void object_property_add_bool(Object *obj, const char *name,
2137                               bool (*get)(Object *, Error **),
2138                               void (*set)(Object *, bool, Error **),
2139                               Error **errp)
2140 {
2141     Error *local_err = NULL;
2142     BoolProperty *prop = g_malloc0(sizeof(*prop));
2143
2144     prop->get = get;
2145     prop->set = set;
2146
2147     object_property_add(obj, name, "bool",
2148                         get ? property_get_bool : NULL,
2149                         set ? property_set_bool : NULL,
2150                         property_release_bool,
2151                         prop, &local_err);
2152     if (local_err) {
2153         error_propagate(errp, local_err);
2154         g_free(prop);
2155     }
2156 }
2157
2158 void object_class_property_add_bool(ObjectClass *klass, const char *name,
2159                                     bool (*get)(Object *, Error **),
2160                                     void (*set)(Object *, bool, Error **),
2161                                     Error **errp)
2162 {
2163     Error *local_err = NULL;
2164     BoolProperty *prop = g_malloc0(sizeof(*prop));
2165
2166     prop->get = get;
2167     prop->set = set;
2168
2169     object_class_property_add(klass, name, "bool",
2170                               get ? property_get_bool : NULL,
2171                               set ? property_set_bool : NULL,
2172                               property_release_bool,
2173                               prop, &local_err);
2174     if (local_err) {
2175         error_propagate(errp, local_err);
2176         g_free(prop);
2177     }
2178 }
2179
2180 static void property_get_enum(Object *obj, Visitor *v, const char *name,
2181                               void *opaque, Error **errp)
2182 {
2183     EnumProperty *prop = opaque;
2184     int value;
2185     Error *err = NULL;
2186
2187     value = prop->get(obj, &err);
2188     if (err) {
2189         error_propagate(errp, err);
2190         return;
2191     }
2192
2193     visit_type_enum(v, name, &value, prop->lookup, errp);
2194 }
2195
2196 static void property_set_enum(Object *obj, Visitor *v, const char *name,
2197                               void *opaque, Error **errp)
2198 {
2199     EnumProperty *prop = opaque;
2200     int value;
2201     Error *err = NULL;
2202
2203     visit_type_enum(v, name, &value, prop->lookup, &err);
2204     if (err) {
2205         error_propagate(errp, err);
2206         return;
2207     }
2208     prop->set(obj, value, errp);
2209 }
2210
2211 static void property_release_enum(Object *obj, const char *name,
2212                                   void *opaque)
2213 {
2214     EnumProperty *prop = opaque;
2215     g_free(prop);
2216 }
2217
2218 void object_property_add_enum(Object *obj, const char *name,
2219                               const char *typename,
2220                               const QEnumLookup *lookup,
2221                               int (*get)(Object *, Error **),
2222                               void (*set)(Object *, int, Error **),
2223                               Error **errp)
2224 {
2225     Error *local_err = NULL;
2226     EnumProperty *prop = g_malloc(sizeof(*prop));
2227
2228     prop->lookup = lookup;
2229     prop->get = get;
2230     prop->set = set;
2231
2232     object_property_add(obj, name, typename,
2233                         get ? property_get_enum : NULL,
2234                         set ? property_set_enum : NULL,
2235                         property_release_enum,
2236                         prop, &local_err);
2237     if (local_err) {
2238         error_propagate(errp, local_err);
2239         g_free(prop);
2240     }
2241 }
2242
2243 void object_class_property_add_enum(ObjectClass *klass, const char *name,
2244                                     const char *typename,
2245                                     const QEnumLookup *lookup,
2246                                     int (*get)(Object *, Error **),
2247                                     void (*set)(Object *, int, Error **),
2248                                     Error **errp)
2249 {
2250     Error *local_err = NULL;
2251     EnumProperty *prop = g_malloc(sizeof(*prop));
2252
2253     prop->lookup = lookup;
2254     prop->get = get;
2255     prop->set = set;
2256
2257     object_class_property_add(klass, name, typename,
2258                               get ? property_get_enum : NULL,
2259                               set ? property_set_enum : NULL,
2260                               property_release_enum,
2261                               prop, &local_err);
2262     if (local_err) {
2263         error_propagate(errp, local_err);
2264         g_free(prop);
2265     }
2266 }
2267
2268 typedef struct TMProperty {
2269     void (*get)(Object *, struct tm *, Error **);
2270 } TMProperty;
2271
2272 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2273                             void *opaque, Error **errp)
2274 {
2275     TMProperty *prop = opaque;
2276     Error *err = NULL;
2277     struct tm value;
2278
2279     prop->get(obj, &value, &err);
2280     if (err) {
2281         goto out;
2282     }
2283
2284     visit_start_struct(v, name, NULL, 0, &err);
2285     if (err) {
2286         goto out;
2287     }
2288     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2289     if (err) {
2290         goto out_end;
2291     }
2292     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2293     if (err) {
2294         goto out_end;
2295     }
2296     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2297     if (err) {
2298         goto out_end;
2299     }
2300     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2301     if (err) {
2302         goto out_end;
2303     }
2304     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2305     if (err) {
2306         goto out_end;
2307     }
2308     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2309     if (err) {
2310         goto out_end;
2311     }
2312     visit_check_struct(v, &err);
2313 out_end:
2314     visit_end_struct(v, NULL);
2315 out:
2316     error_propagate(errp, err);
2317
2318 }
2319
2320 static void property_release_tm(Object *obj, const char *name,
2321                                 void *opaque)
2322 {
2323     TMProperty *prop = opaque;
2324     g_free(prop);
2325 }
2326
2327 void object_property_add_tm(Object *obj, const char *name,
2328                             void (*get)(Object *, struct tm *, Error **),
2329                             Error **errp)
2330 {
2331     Error *local_err = NULL;
2332     TMProperty *prop = g_malloc0(sizeof(*prop));
2333
2334     prop->get = get;
2335
2336     object_property_add(obj, name, "struct tm",
2337                         get ? property_get_tm : NULL, NULL,
2338                         property_release_tm,
2339                         prop, &local_err);
2340     if (local_err) {
2341         error_propagate(errp, local_err);
2342         g_free(prop);
2343     }
2344 }
2345
2346 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2347                                   void (*get)(Object *, struct tm *, Error **),
2348                                   Error **errp)
2349 {
2350     Error *local_err = NULL;
2351     TMProperty *prop = g_malloc0(sizeof(*prop));
2352
2353     prop->get = get;
2354
2355     object_class_property_add(klass, name, "struct tm",
2356                               get ? property_get_tm : NULL, NULL,
2357                               property_release_tm,
2358                               prop, &local_err);
2359     if (local_err) {
2360         error_propagate(errp, local_err);
2361         g_free(prop);
2362     }
2363 }
2364
2365 static char *qdev_get_type(Object *obj, Error **errp)
2366 {
2367     return g_strdup(object_get_typename(obj));
2368 }
2369
2370 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2371                                    void *opaque, Error **errp)
2372 {
2373     uint8_t value = *(uint8_t *)opaque;
2374     visit_type_uint8(v, name, &value, errp);
2375 }
2376
2377 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2378                                     void *opaque, Error **errp)
2379 {
2380     uint16_t value = *(uint16_t *)opaque;
2381     visit_type_uint16(v, name, &value, errp);
2382 }
2383
2384 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2385                                     void *opaque, Error **errp)
2386 {
2387     uint32_t value = *(uint32_t *)opaque;
2388     visit_type_uint32(v, name, &value, errp);
2389 }
2390
2391 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2392                                     void *opaque, Error **errp)
2393 {
2394     uint64_t value = *(uint64_t *)opaque;
2395     visit_type_uint64(v, name, &value, errp);
2396 }
2397
2398 void object_property_add_uint8_ptr(Object *obj, const char *name,
2399                                    const uint8_t *v, Error **errp)
2400 {
2401     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2402                         NULL, NULL, (void *)v, errp);
2403 }
2404
2405 void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2406                                          const uint8_t *v, Error **errp)
2407 {
2408     object_class_property_add(klass, name, "uint8", property_get_uint8_ptr,
2409                               NULL, NULL, (void *)v, errp);
2410 }
2411
2412 void object_property_add_uint16_ptr(Object *obj, const char *name,
2413                                     const uint16_t *v, Error **errp)
2414 {
2415     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2416                         NULL, NULL, (void *)v, errp);
2417 }
2418
2419 void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2420                                           const uint16_t *v, Error **errp)
2421 {
2422     object_class_property_add(klass, name, "uint16", property_get_uint16_ptr,
2423                               NULL, NULL, (void *)v, errp);
2424 }
2425
2426 void object_property_add_uint32_ptr(Object *obj, const char *name,
2427                                     const uint32_t *v, Error **errp)
2428 {
2429     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2430                         NULL, NULL, (void *)v, errp);
2431 }
2432
2433 void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2434                                           const uint32_t *v, Error **errp)
2435 {
2436     object_class_property_add(klass, name, "uint32", property_get_uint32_ptr,
2437                               NULL, NULL, (void *)v, errp);
2438 }
2439
2440 void object_property_add_uint64_ptr(Object *obj, const char *name,
2441                                     const uint64_t *v, Error **errp)
2442 {
2443     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2444                         NULL, NULL, (void *)v, errp);
2445 }
2446
2447 void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2448                                           const uint64_t *v, Error **errp)
2449 {
2450     object_class_property_add(klass, name, "uint64", property_get_uint64_ptr,
2451                               NULL, NULL, (void *)v, errp);
2452 }
2453
2454 typedef struct {
2455     Object *target_obj;
2456     char *target_name;
2457 } AliasProperty;
2458
2459 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2460                                void *opaque, Error **errp)
2461 {
2462     AliasProperty *prop = opaque;
2463
2464     object_property_get(prop->target_obj, v, prop->target_name, errp);
2465 }
2466
2467 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2468                                void *opaque, Error **errp)
2469 {
2470     AliasProperty *prop = opaque;
2471
2472     object_property_set(prop->target_obj, v, prop->target_name, errp);
2473 }
2474
2475 static Object *property_resolve_alias(Object *obj, void *opaque,
2476                                       const gchar *part)
2477 {
2478     AliasProperty *prop = opaque;
2479
2480     return object_resolve_path_component(prop->target_obj, prop->target_name);
2481 }
2482
2483 static void property_release_alias(Object *obj, const char *name, void *opaque)
2484 {
2485     AliasProperty *prop = opaque;
2486
2487     g_free(prop->target_name);
2488     g_free(prop);
2489 }
2490
2491 void object_property_add_alias(Object *obj, const char *name,
2492                                Object *target_obj, const char *target_name,
2493                                Error **errp)
2494 {
2495     AliasProperty *prop;
2496     ObjectProperty *op;
2497     ObjectProperty *target_prop;
2498     gchar *prop_type;
2499     Error *local_err = NULL;
2500
2501     target_prop = object_property_find(target_obj, target_name, errp);
2502     if (!target_prop) {
2503         return;
2504     }
2505
2506     if (object_property_is_child(target_prop)) {
2507         prop_type = g_strdup_printf("link%s",
2508                                     target_prop->type + strlen("child"));
2509     } else {
2510         prop_type = g_strdup(target_prop->type);
2511     }
2512
2513     prop = g_malloc(sizeof(*prop));
2514     prop->target_obj = target_obj;
2515     prop->target_name = g_strdup(target_name);
2516
2517     op = object_property_add(obj, name, prop_type,
2518                              property_get_alias,
2519                              property_set_alias,
2520                              property_release_alias,
2521                              prop, &local_err);
2522     if (local_err) {
2523         error_propagate(errp, local_err);
2524         g_free(prop);
2525         goto out;
2526     }
2527     op->resolve = property_resolve_alias;
2528
2529     object_property_set_description(obj, op->name,
2530                                     target_prop->description,
2531                                     &error_abort);
2532
2533 out:
2534     g_free(prop_type);
2535 }
2536
2537 void object_property_set_description(Object *obj, const char *name,
2538                                      const char *description, Error **errp)
2539 {
2540     ObjectProperty *op;
2541
2542     op = object_property_find(obj, name, errp);
2543     if (!op) {
2544         return;
2545     }
2546
2547     g_free(op->description);
2548     op->description = g_strdup(description);
2549 }
2550
2551 void object_class_property_set_description(ObjectClass *klass,
2552                                            const char *name,
2553                                            const char *description,
2554                                            Error **errp)
2555 {
2556     ObjectProperty *op;
2557
2558     op = g_hash_table_lookup(klass->properties, name);
2559     if (!op) {
2560         error_setg(errp, "Property '.%s' not found", name);
2561         return;
2562     }
2563
2564     g_free(op->description);
2565     op->description = g_strdup(description);
2566 }
2567
2568 static void object_class_init(ObjectClass *klass, void *data)
2569 {
2570     object_class_property_add_str(klass, "type", qdev_get_type,
2571                                   NULL, &error_abort);
2572 }
2573
2574 static void register_types(void)
2575 {
2576     static TypeInfo interface_info = {
2577         .name = TYPE_INTERFACE,
2578         .class_size = sizeof(InterfaceClass),
2579         .abstract = true,
2580     };
2581
2582     static TypeInfo object_info = {
2583         .name = TYPE_OBJECT,
2584         .instance_size = sizeof(Object),
2585         .class_init = object_class_init,
2586         .abstract = true,
2587     };
2588
2589     type_interface = type_register_internal(&interface_info);
2590     type_register_internal(&object_info);
2591 }
2592
2593 type_init(register_types)