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/qobject-input-visitor.h"
  23 #include "qapi/qapi-builtin-visit.h"
  24 #include "qapi/qmp/qerror.h"
  25 #include "qapi/qmp/qjson.h"
  26 #include "trace.h"
  27
  28 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  29  * of the QOM core on QObject?  */
  30 #include "qom/qom-qobject.h"
  31 #include "qapi/qmp/qbool.h"
  32 #include "qapi/qmp/qnum.h"
  33 #include "qapi/qmp/qstring.h"
  34 #include "qemu/error-report.h"
  35
  36 #define MAX_INTERFACES 32
  37
  38 typedef struct InterfaceImpl InterfaceImpl;
  39 typedef struct TypeImpl TypeImpl;
  40
  41 struct InterfaceImpl
  42 {
  43     const char *typename;
  44 };
  45
  46 struct TypeImpl
  47 {
  48     const char *name;
  49
  50     size_t class_size;
  51
  52     size_t instance_size;
  53
  54     void (*class_init)(ObjectClass *klass, void *data);
  55     void (*class_base_init)(ObjectClass *klass, void *data);
  56
  57     void *class_data;
  58
  59     void (*instance_init)(Object *obj);
  60     void (*instance_post_init)(Object *obj);
  61     void (*instance_finalize)(Object *obj);
  62
  63     bool abstract;
  64
  65     const char *parent;
  66     TypeImpl *parent_type;
  67
  68     ObjectClass *class;
  69
  70     int num_interfaces;
  71     InterfaceImpl interfaces[MAX_INTERFACES];
  72 };
  73
  74 static Type type_interface;
  75
  76 static GHashTable *type_table_get(void)
  77 {
  78     static GHashTable *type_table;
  79
  80     if (type_table == NULL) {
  81         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  82     }
  83
  84     return type_table;
  85 }
  86
  87 static bool enumerating_types;
  88
  89 static void type_table_add(TypeImpl *ti)
  90 {
  91     assert(!enumerating_types);
  92     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  93 }
  94
  95 static TypeImpl *type_table_lookup(const char *name)
  96 {
  97     return g_hash_table_lookup(type_table_get(), name);
  98 }
  99
 100 static TypeImpl *type_new(const TypeInfo *info)
 101 {
 102     TypeImpl *ti = g_malloc0(sizeof(*ti));
 103     int i;
 104
 105     g_assert(info->name != NULL);
 106
 107     if (type_table_lookup(info->name) != NULL) {
 108         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 109         abort();
 110     }
 111
 112     ti->name = g_strdup(info->name);
 113     ti->parent = g_strdup(info->parent);
 114
 115     ti->class_size = info->class_size;
 116     ti->instance_size = info->instance_size;
 117
 118     ti->class_init = info->class_init;
 119     ti->class_base_init = info->class_base_init;
 120     ti->class_data = info->class_data;
 121
 122     ti->instance_init = info->instance_init;
 123     ti->instance_post_init = info->instance_post_init;
 124     ti->instance_finalize = info->instance_finalize;
 125
 126     ti->abstract = info->abstract;
 127
 128     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 129         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 130     }
 131     ti->num_interfaces = i;
 132
 133     return ti;
 134 }
 135
 136 static TypeImpl *type_register_internal(const TypeInfo *info)
 137 {
 138     TypeImpl *ti;
 139     ti = type_new(info);
 140
 141     type_table_add(ti);
 142     return ti;
 143 }
 144
 145 TypeImpl *type_register(const TypeInfo *info)
 146 {
 147     assert(info->parent);
 148     return type_register_internal(info);
 149 }
 150
 151 TypeImpl *type_register_static(const TypeInfo *info)
 152 {
 153     return type_register(info);
 154 }
 155
 156 void type_register_static_array(const TypeInfo *infos, int nr_infos)
 157 {
 158     int i;
 159
 160     for (i = 0; i < nr_infos; i++) {
 161         type_register_static(&infos[i]);
 162     }
 163 }
 164
 165 static TypeImpl *type_get_by_name(const char *name)
 166 {
 167     if (name == NULL) {
 168         return NULL;
 169     }
 170
 171     return type_table_lookup(name);
 172 }
 173
 174 static TypeImpl *type_get_parent(TypeImpl *type)
 175 {
 176     if (!type->parent_type && type->parent) {
 177         type->parent_type = type_get_by_name(type->parent);
 178         if (!type->parent_type) {
 179             fprintf(stderr, "Type '%s' is missing its parent '%s'\n",
 180                     type->name, type->parent);
 181             abort();
 182         }
 183     }
 184
 185     return type->parent_type;
 186 }
 187
 188 static bool type_has_parent(TypeImpl *type)
 189 {
 190     return (type->parent != NULL);
 191 }
 192
 193 static size_t type_class_get_size(TypeImpl *ti)
 194 {
 195     if (ti->class_size) {
 196         return ti->class_size;
 197     }
 198
 199     if (type_has_parent(ti)) {
 200         return type_class_get_size(type_get_parent(ti));
 201     }
 202
 203     return sizeof(ObjectClass);
 204 }
 205
 206 static size_t type_object_get_size(TypeImpl *ti)
 207 {
 208     if (ti->instance_size) {
 209         return ti->instance_size;
 210     }
 211
 212     if (type_has_parent(ti)) {
 213         return type_object_get_size(type_get_parent(ti));
 214     }
 215
 216     return 0;
 217 }
 218
 219 size_t object_type_get_instance_size(const char *typename)
 220 {
 221     TypeImpl *type = type_get_by_name(typename);
 222
 223     g_assert(type != NULL);
 224     return type_object_get_size(type);
 225 }
 226
 227 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 228 {
 229     assert(target_type);
 230
 231     /* Check if target_type is a direct ancestor of type */
 232     while (type) {
 233         if (type == target_type) {
 234             return true;
 235         }
 236
 237         type = type_get_parent(type);
 238     }
 239
 240     return false;
 241 }
 242
 243 static void type_initialize(TypeImpl *ti);
 244
 245 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 246                                       TypeImpl *parent_type)
 247 {
 248     InterfaceClass *new_iface;
 249     TypeInfo info = { };
 250     TypeImpl *iface_impl;
 251
 252     info.parent = parent_type->name;
 253     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 254     info.abstract = true;
 255
 256     iface_impl = type_new(&info);
 257     iface_impl->parent_type = parent_type;
 258     type_initialize(iface_impl);
 259     g_free((char *)info.name);
 260
 261     new_iface = (InterfaceClass *)iface_impl->class;
 262     new_iface->concrete_class = ti->class;
 263     new_iface->interface_type = interface_type;
 264
 265     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 266                                            iface_impl->class);
 267 }
 268
 269 static void object_property_free(gpointer data)
 270 {
 271     ObjectProperty *prop = data;
 272
 273     if (prop->defval) {
 274         qobject_unref(prop->defval);
 275         prop->defval = NULL;
 276     }
 277     g_free(prop->name);
 278     g_free(prop->type);
 279     g_free(prop->description);
 280     g_free(prop);
 281 }
 282
 283 static void type_initialize(TypeImpl *ti)
 284 {
 285     TypeImpl *parent;
 286
 287     if (ti->class) {
 288         return;
 289     }
 290
 291     ti->class_size = type_class_get_size(ti);
 292     ti->instance_size = type_object_get_size(ti);
 293     /* Any type with zero instance_size is implicitly abstract.
 294      * This means interface types are all abstract.
 295      */
 296     if (ti->instance_size == 0) {
 297         ti->abstract = true;
 298     }
 299     if (type_is_ancestor(ti, type_interface)) {
 300         assert(ti->instance_size == 0);
 301         assert(ti->abstract);
 302         assert(!ti->instance_init);
 303         assert(!ti->instance_post_init);
 304         assert(!ti->instance_finalize);
 305         assert(!ti->num_interfaces);
 306     }
 307     ti->class = g_malloc0(ti->class_size);
 308
 309     parent = type_get_parent(ti);
 310     if (parent) {
 311         type_initialize(parent);
 312         GSList *e;
 313         int i;
 314
 315         g_assert(parent->class_size <= ti->class_size);
 316         g_assert(parent->instance_size <= ti->instance_size);
 317         memcpy(ti->class, parent->class, parent->class_size);
 318         ti->class->interfaces = NULL;
 319         ti->class->properties = g_hash_table_new_full(
 320             g_str_hash, g_str_equal, NULL, object_property_free);
 321
 322         for (e = parent->class->interfaces; e; e = e->next) {
 323             InterfaceClass *iface = e->data;
 324             ObjectClass *klass = OBJECT_CLASS(iface);
 325
 326             type_initialize_interface(ti, iface->interface_type, klass->type);
 327         }
 328
 329         for (i = 0; i < ti->num_interfaces; i++) {
 330             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 331             if (!t) {
 332                 error_report("missing interface '%s' for object '%s'",
 333                              ti->interfaces[i].typename, parent->name);
 334                 abort();
 335             }
 336             for (e = ti->class->interfaces; e; e = e->next) {
 337                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 338
 339                 if (type_is_ancestor(target_type, t)) {
 340                     break;
 341                 }
 342             }
 343
 344             if (e) {
 345                 continue;
 346             }
 347
 348             type_initialize_interface(ti, t, t);
 349         }
 350     } else {
 351         ti->class->properties = g_hash_table_new_full(
 352             g_str_hash, g_str_equal, NULL, object_property_free);
 353     }
 354
 355     ti->class->type = ti;
 356
 357     while (parent) {
 358         if (parent->class_base_init) {
 359             parent->class_base_init(ti->class, ti->class_data);
 360         }
 361         parent = type_get_parent(parent);
 362     }
 363
 364     if (ti->class_init) {
 365         ti->class_init(ti->class, ti->class_data);
 366     }
 367 }
 368
 369 static void object_init_with_type(Object *obj, TypeImpl *ti)
 370 {
 371     if (type_has_parent(ti)) {
 372         object_init_with_type(obj, type_get_parent(ti));
 373     }
 374
 375     if (ti->instance_init) {
 376         ti->instance_init(obj);
 377     }
 378 }
 379
 380 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 381 {
 382     if (ti->instance_post_init) {
 383         ti->instance_post_init(obj);
 384     }
 385
 386     if (type_has_parent(ti)) {
 387         object_post_init_with_type(obj, type_get_parent(ti));
 388     }
 389 }
 390
 391 void object_apply_global_props(Object *obj, const GPtrArray *props, Error **errp)
 392 {
 393     int i;
 394
 395     if (!props) {
 396         return;
 397     }
 398
 399     for (i = 0; i < props->len; i++) {
 400         GlobalProperty *p = g_ptr_array_index(props, i);
 401         Error *err = NULL;
 402
 403         if (object_dynamic_cast(obj, p->driver) == NULL) {
 404             continue;
 405         }
 406         if (p->optional && !object_property_find(obj, p->property, NULL)) {
 407             continue;
 408         }
 409         p->used = true;
 410         object_property_parse(obj, p->value, p->property, &err);
 411         if (err != NULL) {
 412             error_prepend(&err, "can't apply global %s.%s=%s: ",
 413                           p->driver, p->property, p->value);
 414             /*
 415              * If errp != NULL, propagate error and return.
 416              * If errp == NULL, report a warning, but keep going
 417              * with the remaining globals.
 418              */
 419             if (errp) {
 420                 error_propagate(errp, err);
 421                 return;
 422             } else {
 423                 warn_report_err(err);
 424             }
 425         }
 426     }
 427 }
 428
 429 /*
 430  * Global property defaults
 431  * Slot 0: accelerator's global property defaults
 432  * Slot 1: machine's global property defaults
 433  * Slot 2: global properties from legacy command line option
 434  * Each is a GPtrArray of of GlobalProperty.
 435  * Applied in order, later entries override earlier ones.
 436  */
 437 static GPtrArray *object_compat_props[3];
 438
 439 /*
 440  * Retrieve @GPtrArray for global property defined with options
 441  * other than "-global".  These are generally used for syntactic
 442  * sugar and legacy command line options.
 443  */
 444 void object_register_sugar_prop(const char *driver, const char *prop, const char *value)
 445 {
 446     GlobalProperty *g;
 447     if (!object_compat_props[2]) {
 448         object_compat_props[2] = g_ptr_array_new();
 449     }
 450     g = g_new0(GlobalProperty, 1);
 451     g->driver = g_strdup(driver);
 452     g->property = g_strdup(prop);
 453     g->value = g_strdup(value);
 454     g_ptr_array_add(object_compat_props[2], g);
 455 }
 456
 457 /*
 458  * Set machine's global property defaults to @compat_props.
 459  * May be called at most once.
 460  */
 461 void object_set_machine_compat_props(GPtrArray *compat_props)
 462 {
 463     assert(!object_compat_props[1]);
 464     object_compat_props[1] = compat_props;
 465 }
 466
 467 /*
 468  * Set accelerator's global property defaults to @compat_props.
 469  * May be called at most once.
 470  */
 471 void object_set_accelerator_compat_props(GPtrArray *compat_props)
 472 {
 473     assert(!object_compat_props[0]);
 474     object_compat_props[0] = compat_props;
 475 }
 476
 477 void object_apply_compat_props(Object *obj)
 478 {
 479     int i;
 480
 481     for (i = 0; i < ARRAY_SIZE(object_compat_props); i++) {
 482         object_apply_global_props(obj, object_compat_props[i],
 483                                   i == 2 ? &error_fatal : &error_abort);
 484     }
 485 }
 486
 487 static void object_class_property_init_all(Object *obj)
 488 {
 489     ObjectPropertyIterator iter;
 490     ObjectProperty *prop;
 491
 492     object_class_property_iter_init(&iter, object_get_class(obj));
 493     while ((prop = object_property_iter_next(&iter))) {
 494         if (prop->init) {
 495             prop->init(obj, prop);
 496         }
 497     }
 498 }
 499
 500 static void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 501 {
 502     Object *obj = data;
 503
 504     type_initialize(type);
 505
 506     g_assert(type->instance_size >= sizeof(Object));
 507     g_assert(type->abstract == false);
 508     g_assert(size >= type->instance_size);
 509
 510     memset(obj, 0, type->instance_size);
 511     obj->class = type->class;
 512     object_ref(obj);
 513     object_class_property_init_all(obj);
 514     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 515                                             NULL, object_property_free);
 516     object_init_with_type(obj, type);
 517     object_post_init_with_type(obj, type);
 518 }
 519
 520 void object_initialize(void *data, size_t size, const char *typename)
 521 {
 522     TypeImpl *type = type_get_by_name(typename);
 523
 524     if (!type) {
 525         error_report("missing object type '%s'", typename);
 526         abort();
 527     }
 528
 529     object_initialize_with_type(data, size, type);
 530 }
 531
 532 void object_initialize_child(Object *parentobj, const char *propname,
 533                              void *childobj, size_t size, const char *type,
 534                              Error **errp, ...)
 535 {
 536     va_list vargs;
 537
 538     va_start(vargs, errp);
 539     object_initialize_childv(parentobj, propname, childobj, size, type, errp,
 540                              vargs);
 541     va_end(vargs);
 542 }
 543
 544 void object_initialize_childv(Object *parentobj, const char *propname,
 545                               void *childobj, size_t size, const char *type,
 546                               Error **errp, va_list vargs)
 547 {
 548     Error *local_err = NULL;
 549     Object *obj;
 550     UserCreatable *uc;
 551
 552     object_initialize(childobj, size, type);
 553     obj = OBJECT(childobj);
 554
 555     object_set_propv(obj, &local_err, vargs);
 556     if (local_err) {
 557         goto out;
 558     }
 559
 560     object_property_add_child(parentobj, propname, obj, &local_err);
 561     if (local_err) {
 562         goto out;
 563     }
 564
 565     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 566     if (uc) {
 567         user_creatable_complete(uc, &local_err);
 568         if (local_err) {
 569             object_unparent(obj);
 570             goto out;
 571         }
 572     }
 573
 574     /*
 575      * Since object_property_add_child added a reference to the child object,
 576      * we can drop the reference added by object_initialize(), so the child
 577      * property will own the only reference to the object.
 578      */
 579     object_unref(obj);
 580
 581 out:
 582     if (local_err) {
 583         error_propagate(errp, local_err);
 584         object_unref(obj);
 585     }
 586 }
 587
 588 static inline bool object_property_is_child(ObjectProperty *prop)
 589 {
 590     return strstart(prop->type, "child<", NULL);
 591 }
 592
 593 static void object_property_del_all(Object *obj)
 594 {
 595     g_autoptr(GHashTable) done = g_hash_table_new(NULL, NULL);
 596     ObjectProperty *prop;
 597     ObjectPropertyIterator iter;
 598     bool released;
 599
 600     do {
 601         released = false;
 602         object_property_iter_init(&iter, obj);
 603         while ((prop = object_property_iter_next(&iter)) != NULL) {
 604             if (g_hash_table_add(done, prop)) {
 605                 if (prop->release) {
 606                     prop->release(obj, prop->name, prop->opaque);
 607                     released = true;
 608                     break;
 609                 }
 610             }
 611         }
 612     } while (released);
 613
 614     g_hash_table_unref(obj->properties);
 615 }
 616
 617 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 618 {
 619     ObjectProperty *prop;
 620     GHashTableIter iter;
 621     gpointer key, value;
 622
 623     g_hash_table_iter_init(&iter, obj->properties);
 624     while (g_hash_table_iter_next(&iter, &key, &value)) {
 625         prop = value;
 626         if (object_property_is_child(prop) && prop->opaque == child) {
 627             if (prop->release) {
 628                 prop->release(obj, prop->name, prop->opaque);
 629                 prop->release = NULL;
 630             }
 631             break;
 632         }
 633     }
 634     g_hash_table_iter_init(&iter, obj->properties);
 635     while (g_hash_table_iter_next(&iter, &key, &value)) {
 636         prop = value;
 637         if (object_property_is_child(prop) && prop->opaque == child) {
 638             g_hash_table_iter_remove(&iter);
 639             break;
 640         }
 641     }
 642 }
 643
 644 void object_unparent(Object *obj)
 645 {
 646     if (obj->parent) {
 647         object_property_del_child(obj->parent, obj, NULL);
 648     }
 649 }
 650
 651 static void object_deinit(Object *obj, TypeImpl *type)
 652 {
 653     if (type->instance_finalize) {
 654         type->instance_finalize(obj);
 655     }
 656
 657     if (type_has_parent(type)) {
 658         object_deinit(obj, type_get_parent(type));
 659     }
 660 }
 661
 662 static void object_finalize(void *data)
 663 {
 664     Object *obj = data;
 665     TypeImpl *ti = obj->class->type;
 666
 667     object_property_del_all(obj);
 668     object_deinit(obj, ti);
 669
 670     g_assert(obj->ref == 0);
 671     if (obj->free) {
 672         obj->free(obj);
 673     }
 674 }
 675
 676 static Object *object_new_with_type(Type type)
 677 {
 678     Object *obj;
 679
 680     g_assert(type != NULL);
 681     type_initialize(type);
 682
 683     obj = g_malloc(type->instance_size);
 684     object_initialize_with_type(obj, type->instance_size, type);
 685     obj->free = g_free;
 686
 687     return obj;
 688 }
 689
 690 Object *object_new_with_class(ObjectClass *klass)
 691 {
 692     return object_new_with_type(klass->type);
 693 }
 694
 695 Object *object_new(const char *typename)
 696 {
 697     TypeImpl *ti = type_get_by_name(typename);
 698
 699     return object_new_with_type(ti);
 700 }
 701
 702
 703 Object *object_new_with_props(const char *typename,
 704                               Object *parent,
 705                               const char *id,
 706                               Error **errp,
 707                               ...)
 708 {
 709     va_list vargs;
 710     Object *obj;
 711
 712     va_start(vargs, errp);
 713     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 714     va_end(vargs);
 715
 716     return obj;
 717 }
 718
 719
 720 Object *object_new_with_propv(const char *typename,
 721                               Object *parent,
 722                               const char *id,
 723                               Error **errp,
 724                               va_list vargs)
 725 {
 726     Object *obj;
 727     ObjectClass *klass;
 728     Error *local_err = NULL;
 729     UserCreatable *uc;
 730
 731     klass = object_class_by_name(typename);
 732     if (!klass) {
 733         error_setg(errp, "invalid object type: %s", typename);
 734         return NULL;
 735     }
 736
 737     if (object_class_is_abstract(klass)) {
 738         error_setg(errp, "object type '%s' is abstract", typename);
 739         return NULL;
 740     }
 741     obj = object_new_with_type(klass->type);
 742
 743     if (object_set_propv(obj, &local_err, vargs) < 0) {
 744         goto error;
 745     }
 746
 747     if (id != NULL) {
 748         object_property_add_child(parent, id, obj, &local_err);
 749         if (local_err) {
 750             goto error;
 751         }
 752     }
 753
 754     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 755     if (uc) {
 756         user_creatable_complete(uc, &local_err);
 757         if (local_err) {
 758             if (id != NULL) {
 759                 object_unparent(obj);
 760             }
 761             goto error;
 762         }
 763     }
 764
 765     object_unref(OBJECT(obj));
 766     return obj;
 767
 768  error:
 769     error_propagate(errp, local_err);
 770     object_unref(obj);
 771     return NULL;
 772 }
 773
 774
 775 int object_set_props(Object *obj,
 776                      Error **errp,
 777                      ...)
 778 {
 779     va_list vargs;
 780     int ret;
 781
 782     va_start(vargs, errp);
 783     ret = object_set_propv(obj, errp, vargs);
 784     va_end(vargs);
 785
 786     return ret;
 787 }
 788
 789
 790 int object_set_propv(Object *obj,
 791                      Error **errp,
 792                      va_list vargs)
 793 {
 794     const char *propname;
 795     Error *local_err = NULL;
 796
 797     propname = va_arg(vargs, char *);
 798     while (propname != NULL) {
 799         const char *value = va_arg(vargs, char *);
 800
 801         g_assert(value != NULL);
 802         object_property_parse(obj, value, propname, &local_err);
 803         if (local_err) {
 804             error_propagate(errp, local_err);
 805             return -1;
 806         }
 807         propname = va_arg(vargs, char *);
 808     }
 809
 810     return 0;
 811 }
 812
 813
 814 Object *object_dynamic_cast(Object *obj, const char *typename)
 815 {
 816     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 817         return obj;
 818     }
 819
 820     return NULL;
 821 }
 822
 823 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 824                                    const char *file, int line, const char *func)
 825 {
 826     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 827                                      typename, file, line, func);
 828
 829 #ifdef CONFIG_QOM_CAST_DEBUG
 830     int i;
 831     Object *inst;
 832
 833     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 834         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 835             goto out;
 836         }
 837     }
 838
 839     inst = object_dynamic_cast(obj, typename);
 840
 841     if (!inst && obj) {
 842         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 843                 file, line, func, obj, typename);
 844         abort();
 845     }
 846
 847     assert(obj == inst);
 848
 849     if (obj && obj == inst) {
 850         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 851             atomic_set(&obj->class->object_cast_cache[i - 1],
 852                        atomic_read(&obj->class->object_cast_cache[i]));
 853         }
 854         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 855     }
 856
 857 out:
 858 #endif
 859     return obj;
 860 }
 861
 862 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 863                                        const char *typename)
 864 {
 865     ObjectClass *ret = NULL;
 866     TypeImpl *target_type;
 867     TypeImpl *type;
 868
 869     if (!class) {
 870         return NULL;
 871     }
 872
 873     /* A simple fast path that can trigger a lot for leaf classes.  */
 874     type = class->type;
 875     if (type->name == typename) {
 876         return class;
 877     }
 878
 879     target_type = type_get_by_name(typename);
 880     if (!target_type) {
 881         /* target class type unknown, so fail the cast */
 882         return NULL;
 883     }
 884
 885     if (type->class->interfaces &&
 886             type_is_ancestor(target_type, type_interface)) {
 887         int found = 0;
 888         GSList *i;
 889
 890         for (i = class->interfaces; i; i = i->next) {
 891             ObjectClass *target_class = i->data;
 892
 893             if (type_is_ancestor(target_class->type, target_type)) {
 894                 ret = target_class;
 895                 found++;
 896             }
 897          }
 898
 899         /* The match was ambiguous, don't allow a cast */
 900         if (found > 1) {
 901             ret = NULL;
 902         }
 903     } else if (type_is_ancestor(type, target_type)) {
 904         ret = class;
 905     }
 906
 907     return ret;
 908 }
 909
 910 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 911                                               const char *typename,
 912                                               const char *file, int line,
 913                                               const char *func)
 914 {
 915     ObjectClass *ret;
 916
 917     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 918                                            typename, file, line, func);
 919
 920 #ifdef CONFIG_QOM_CAST_DEBUG
 921     int i;
 922
 923     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 924         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 925             ret = class;
 926             goto out;
 927         }
 928     }
 929 #else
 930     if (!class || !class->interfaces) {
 931         return class;
 932     }
 933 #endif
 934
 935     ret = object_class_dynamic_cast(class, typename);
 936     if (!ret && class) {
 937         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 938                 file, line, func, class, typename);
 939         abort();
 940     }
 941
 942 #ifdef CONFIG_QOM_CAST_DEBUG
 943     if (class && ret == class) {
 944         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 945             atomic_set(&class->class_cast_cache[i - 1],
 946                        atomic_read(&class->class_cast_cache[i]));
 947         }
 948         atomic_set(&class->class_cast_cache[i - 1], typename);
 949     }
 950 out:
 951 #endif
 952     return ret;
 953 }
 954
 955 const char *object_get_typename(const Object *obj)
 956 {
 957     return obj->class->type->name;
 958 }
 959
 960 ObjectClass *object_get_class(Object *obj)
 961 {
 962     return obj->class;
 963 }
 964
 965 bool object_class_is_abstract(ObjectClass *klass)
 966 {
 967     return klass->type->abstract;
 968 }
 969
 970 const char *object_class_get_name(ObjectClass *klass)
 971 {
 972     return klass->type->name;
 973 }
 974
 975 ObjectClass *object_class_by_name(const char *typename)
 976 {
 977     TypeImpl *type = type_get_by_name(typename);
 978
 979     if (!type) {
 980         return NULL;
 981     }
 982
 983     type_initialize(type);
 984
 985     return type->class;
 986 }
 987
 988 ObjectClass *object_class_get_parent(ObjectClass *class)
 989 {
 990     TypeImpl *type = type_get_parent(class->type);
 991
 992     if (!type) {
 993         return NULL;
 994     }
 995
 996     type_initialize(type);
 997
 998     return type->class;
 999 }
1000
1001 typedef struct OCFData
1002 {
1003     void (*fn)(ObjectClass *klass, void *opaque);
1004     const char *implements_type;
1005     bool include_abstract;
1006     void *opaque;
1007 } OCFData;
1008
1009 static void object_class_foreach_tramp(gpointer key, gpointer value,
1010                                        gpointer opaque)
1011 {
1012     OCFData *data = opaque;
1013     TypeImpl *type = value;
1014     ObjectClass *k;
1015
1016     type_initialize(type);
1017     k = type->class;
1018
1019     if (!data->include_abstract && type->abstract) {
1020         return;
1021     }
1022
1023     if (data->implements_type &&
1024         !object_class_dynamic_cast(k, data->implements_type)) {
1025         return;
1026     }
1027
1028     data->fn(k, data->opaque);
1029 }
1030
1031 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
1032                           const char *implements_type, bool include_abstract,
1033                           void *opaque)
1034 {
1035     OCFData data = { fn, implements_type, include_abstract, opaque };
1036
1037     enumerating_types = true;
1038     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
1039     enumerating_types = false;
1040 }
1041
1042 static int do_object_child_foreach(Object *obj,
1043                                    int (*fn)(Object *child, void *opaque),
1044                                    void *opaque, bool recurse)
1045 {
1046     GHashTableIter iter;
1047     ObjectProperty *prop;
1048     int ret = 0;
1049
1050     g_hash_table_iter_init(&iter, obj->properties);
1051     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1052         if (object_property_is_child(prop)) {
1053             Object *child = prop->opaque;
1054
1055             ret = fn(child, opaque);
1056             if (ret != 0) {
1057                 break;
1058             }
1059             if (recurse) {
1060                 do_object_child_foreach(child, fn, opaque, true);
1061             }
1062         }
1063     }
1064     return ret;
1065 }
1066
1067 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
1068                          void *opaque)
1069 {
1070     return do_object_child_foreach(obj, fn, opaque, false);
1071 }
1072
1073 int object_child_foreach_recursive(Object *obj,
1074                                    int (*fn)(Object *child, void *opaque),
1075                                    void *opaque)
1076 {
1077     return do_object_child_foreach(obj, fn, opaque, true);
1078 }
1079
1080 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
1081 {
1082     GSList **list = opaque;
1083
1084     *list = g_slist_prepend(*list, klass);
1085 }
1086
1087 GSList *object_class_get_list(const char *implements_type,
1088                               bool include_abstract)
1089 {
1090     GSList *list = NULL;
1091
1092     object_class_foreach(object_class_get_list_tramp,
1093                          implements_type, include_abstract, &list);
1094     return list;
1095 }
1096
1097 static gint object_class_cmp(gconstpointer a, gconstpointer b)
1098 {
1099     return strcasecmp(object_class_get_name((ObjectClass *)a),
1100                       object_class_get_name((ObjectClass *)b));
1101 }
1102
1103 GSList *object_class_get_list_sorted(const char *implements_type,
1104                                      bool include_abstract)
1105 {
1106     return g_slist_sort(object_class_get_list(implements_type, include_abstract),
1107                         object_class_cmp);
1108 }
1109
1110 void object_ref(Object *obj)
1111 {
1112     if (!obj) {
1113         return;
1114     }
1115     atomic_inc(&obj->ref);
1116 }
1117
1118 void object_unref(Object *obj)
1119 {
1120     if (!obj) {
1121         return;
1122     }
1123     g_assert(obj->ref > 0);
1124
1125     /* parent always holds a reference to its children */
1126     if (atomic_fetch_dec(&obj->ref) == 1) {
1127         object_finalize(obj);
1128     }
1129 }
1130
1131 ObjectProperty *
1132 object_property_add(Object *obj, const char *name, const char *type,
1133                     ObjectPropertyAccessor *get,
1134                     ObjectPropertyAccessor *set,
1135                     ObjectPropertyRelease *release,
1136                     void *opaque, Error **errp)
1137 {
1138     ObjectProperty *prop;
1139     size_t name_len = strlen(name);
1140
1141     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
1142         int i;
1143         ObjectProperty *ret;
1144         char *name_no_array = g_strdup(name);
1145
1146         name_no_array[name_len - 3] = '\0';
1147         for (i = 0; ; ++i) {
1148             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
1149
1150             ret = object_property_add(obj, full_name, type, get, set,
1151                                       release, opaque, NULL);
1152             g_free(full_name);
1153             if (ret) {
1154                 break;
1155             }
1156         }
1157         g_free(name_no_array);
1158         return ret;
1159     }
1160
1161     if (object_property_find(obj, name, NULL) != NULL) {
1162         error_setg(errp, "attempt to add duplicate property '%s' to object (type '%s')",
1163                    name, object_get_typename(obj));
1164         return NULL;
1165     }
1166
1167     prop = g_malloc0(sizeof(*prop));
1168
1169     prop->name = g_strdup(name);
1170     prop->type = g_strdup(type);
1171
1172     prop->get = get;
1173     prop->set = set;
1174     prop->release = release;
1175     prop->opaque = opaque;
1176
1177     g_hash_table_insert(obj->properties, prop->name, prop);
1178     return prop;
1179 }
1180
1181 ObjectProperty *
1182 object_class_property_add(ObjectClass *klass,
1183                           const char *name,
1184                           const char *type,
1185                           ObjectPropertyAccessor *get,
1186                           ObjectPropertyAccessor *set,
1187                           ObjectPropertyRelease *release,
1188                           void *opaque,
1189                           Error **errp)
1190 {
1191     ObjectProperty *prop;
1192
1193     if (object_class_property_find(klass, name, NULL) != NULL) {
1194         error_setg(errp, "attempt to add duplicate property '%s' to class (type '%s')",
1195                    name, object_class_get_name(klass));
1196         return NULL;
1197     }
1198
1199     prop = g_malloc0(sizeof(*prop));
1200
1201     prop->name = g_strdup(name);
1202     prop->type = g_strdup(type);
1203
1204     prop->get = get;
1205     prop->set = set;
1206     prop->release = release;
1207     prop->opaque = opaque;
1208
1209     g_hash_table_insert(klass->properties, prop->name, prop);
1210
1211     return prop;
1212 }
1213
1214 ObjectProperty *object_property_find(Object *obj, const char *name,
1215                                      Error **errp)
1216 {
1217     ObjectProperty *prop;
1218     ObjectClass *klass = object_get_class(obj);
1219
1220     prop = object_class_property_find(klass, name, NULL);
1221     if (prop) {
1222         return prop;
1223     }
1224
1225     prop = g_hash_table_lookup(obj->properties, name);
1226     if (prop) {
1227         return prop;
1228     }
1229
1230     error_setg(errp, "Property '.%s' not found", name);
1231     return NULL;
1232 }
1233
1234 void object_property_iter_init(ObjectPropertyIterator *iter,
1235                                Object *obj)
1236 {
1237     g_hash_table_iter_init(&iter->iter, obj->properties);
1238     iter->nextclass = object_get_class(obj);
1239 }
1240
1241 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1242 {
1243     gpointer key, val;
1244     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1245         if (!iter->nextclass) {
1246             return NULL;
1247         }
1248         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1249         iter->nextclass = object_class_get_parent(iter->nextclass);
1250     }
1251     return val;
1252 }
1253
1254 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1255                                      ObjectClass *klass)
1256 {
1257     g_hash_table_iter_init(&iter->iter, klass->properties);
1258     iter->nextclass = object_class_get_parent(klass);
1259 }
1260
1261 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1262                                            Error **errp)
1263 {
1264     ObjectProperty *prop;
1265     ObjectClass *parent_klass;
1266
1267     parent_klass = object_class_get_parent(klass);
1268     if (parent_klass) {
1269         prop = object_class_property_find(parent_klass, name, NULL);
1270         if (prop) {
1271             return prop;
1272         }
1273     }
1274
1275     prop = g_hash_table_lookup(klass->properties, name);
1276     if (!prop) {
1277         error_setg(errp, "Property '.%s' not found", name);
1278     }
1279     return prop;
1280 }
1281
1282 void object_property_del(Object *obj, const char *name, Error **errp)
1283 {
1284     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1285
1286     if (!prop) {
1287         error_setg(errp, "Property '.%s' not found", name);
1288         return;
1289     }
1290
1291     if (prop->release) {
1292         prop->release(obj, name, prop->opaque);
1293     }
1294     g_hash_table_remove(obj->properties, name);
1295 }
1296
1297 void object_property_get(Object *obj, Visitor *v, const char *name,
1298                          Error **errp)
1299 {
1300     ObjectProperty *prop = object_property_find(obj, name, errp);
1301     if (prop == NULL) {
1302         return;
1303     }
1304
1305     if (!prop->get) {
1306         error_setg(errp, QERR_PERMISSION_DENIED);
1307     } else {
1308         prop->get(obj, v, name, prop->opaque, errp);
1309     }
1310 }
1311
1312 void object_property_set(Object *obj, Visitor *v, const char *name,
1313                          Error **errp)
1314 {
1315     ObjectProperty *prop = object_property_find(obj, name, errp);
1316     if (prop == NULL) {
1317         return;
1318     }
1319
1320     if (!prop->set) {
1321         error_setg(errp, QERR_PERMISSION_DENIED);
1322     } else {
1323         prop->set(obj, v, name, prop->opaque, errp);
1324     }
1325 }
1326
1327 void object_property_set_str(Object *obj, const char *value,
1328                              const char *name, Error **errp)
1329 {
1330     QString *qstr = qstring_from_str(value);
1331     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1332
1333     qobject_unref(qstr);
1334 }
1335
1336 char *object_property_get_str(Object *obj, const char *name,
1337                               Error **errp)
1338 {
1339     QObject *ret = object_property_get_qobject(obj, name, errp);
1340     char *retval;
1341
1342     if (!ret) {
1343         return NULL;
1344     }
1345
1346     retval = g_strdup(qobject_get_try_str(ret));
1347     if (!retval) {
1348         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1349     }
1350
1351     qobject_unref(ret);
1352     return retval;
1353 }
1354
1355 void object_property_set_link(Object *obj, Object *value,
1356                               const char *name, Error **errp)
1357 {
1358     if (value) {
1359         gchar *path = object_get_canonical_path(value);
1360         object_property_set_str(obj, path, name, errp);
1361         g_free(path);
1362     } else {
1363         object_property_set_str(obj, "", name, errp);
1364     }
1365 }
1366
1367 Object *object_property_get_link(Object *obj, const char *name,
1368                                  Error **errp)
1369 {
1370     char *str = object_property_get_str(obj, name, errp);
1371     Object *target = NULL;
1372
1373     if (str && *str) {
1374         target = object_resolve_path(str, NULL);
1375         if (!target) {
1376             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1377                       "Device '%s' not found", str);
1378         }
1379     }
1380
1381     g_free(str);
1382     return target;
1383 }
1384
1385 void object_property_set_bool(Object *obj, bool value,
1386                               const char *name, Error **errp)
1387 {
1388     QBool *qbool = qbool_from_bool(value);
1389     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1390
1391     qobject_unref(qbool);
1392 }
1393
1394 bool object_property_get_bool(Object *obj, const char *name,
1395                               Error **errp)
1396 {
1397     QObject *ret = object_property_get_qobject(obj, name, errp);
1398     QBool *qbool;
1399     bool retval;
1400
1401     if (!ret) {
1402         return false;
1403     }
1404     qbool = qobject_to(QBool, ret);
1405     if (!qbool) {
1406         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1407         retval = false;
1408     } else {
1409         retval = qbool_get_bool(qbool);
1410     }
1411
1412     qobject_unref(ret);
1413     return retval;
1414 }
1415
1416 void object_property_set_int(Object *obj, int64_t value,
1417                              const char *name, Error **errp)
1418 {
1419     QNum *qnum = qnum_from_int(value);
1420     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1421
1422     qobject_unref(qnum);
1423 }
1424
1425 int64_t object_property_get_int(Object *obj, const char *name,
1426                                 Error **errp)
1427 {
1428     QObject *ret = object_property_get_qobject(obj, name, errp);
1429     QNum *qnum;
1430     int64_t retval;
1431
1432     if (!ret) {
1433         return -1;
1434     }
1435
1436     qnum = qobject_to(QNum, ret);
1437     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1438         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1439         retval = -1;
1440     }
1441
1442     qobject_unref(ret);
1443     return retval;
1444 }
1445
1446 static void object_property_init_defval(Object *obj, ObjectProperty *prop)
1447 {
1448     Visitor *v = qobject_input_visitor_new(prop->defval);
1449
1450     assert(prop->set != NULL);
1451     prop->set(obj, v, prop->name, prop->opaque, &error_abort);
1452
1453     visit_free(v);
1454 }
1455
1456 static void object_property_set_default(ObjectProperty *prop, QObject *defval)
1457 {
1458     assert(!prop->defval);
1459     assert(!prop->init);
1460
1461     prop->defval = defval;
1462     prop->init = object_property_init_defval;
1463 }
1464
1465 void object_property_set_default_bool(ObjectProperty *prop, bool value)
1466 {
1467     object_property_set_default(prop, QOBJECT(qbool_from_bool(value)));
1468 }
1469
1470 void object_property_set_default_str(ObjectProperty *prop, const char *value)
1471 {
1472     object_property_set_default(prop, QOBJECT(qstring_from_str(value)));
1473 }
1474
1475 void object_property_set_default_int(ObjectProperty *prop, int64_t value)
1476 {
1477     object_property_set_default(prop, QOBJECT(qnum_from_int(value)));
1478 }
1479
1480 void object_property_set_default_uint(ObjectProperty *prop, uint64_t value)
1481 {
1482     object_property_set_default(prop, QOBJECT(qnum_from_uint(value)));
1483 }
1484
1485 void object_property_set_uint(Object *obj, uint64_t value,
1486                               const char *name, Error **errp)
1487 {
1488     QNum *qnum = qnum_from_uint(value);
1489
1490     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1491     qobject_unref(qnum);
1492 }
1493
1494 uint64_t object_property_get_uint(Object *obj, const char *name,
1495                                   Error **errp)
1496 {
1497     QObject *ret = object_property_get_qobject(obj, name, errp);
1498     QNum *qnum;
1499     uint64_t retval;
1500
1501     if (!ret) {
1502         return 0;
1503     }
1504     qnum = qobject_to(QNum, ret);
1505     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1506         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1507         retval = 0;
1508     }
1509
1510     qobject_unref(ret);
1511     return retval;
1512 }
1513
1514 typedef struct EnumProperty {
1515     const QEnumLookup *lookup;
1516     int (*get)(Object *, Error **);
1517     void (*set)(Object *, int, Error **);
1518 } EnumProperty;
1519
1520 int object_property_get_enum(Object *obj, const char *name,
1521                              const char *typename, Error **errp)
1522 {
1523     Error *err = NULL;
1524     Visitor *v;
1525     char *str;
1526     int ret;
1527     ObjectProperty *prop = object_property_find(obj, name, errp);
1528     EnumProperty *enumprop;
1529
1530     if (prop == NULL) {
1531         return 0;
1532     }
1533
1534     if (!g_str_equal(prop->type, typename)) {
1535         error_setg(errp, "Property %s on %s is not '%s' enum type",
1536                    name, object_class_get_name(
1537                        object_get_class(obj)), typename);
1538         return 0;
1539     }
1540
1541     enumprop = prop->opaque;
1542
1543     v = string_output_visitor_new(false, &str);
1544     object_property_get(obj, v, name, &err);
1545     if (err) {
1546         error_propagate(errp, err);
1547         visit_free(v);
1548         return 0;
1549     }
1550     visit_complete(v, &str);
1551     visit_free(v);
1552     v = string_input_visitor_new(str);
1553     visit_type_enum(v, name, &ret, enumprop->lookup, errp);
1554
1555     g_free(str);
1556     visit_free(v);
1557
1558     return ret;
1559 }
1560
1561 void object_property_get_uint16List(Object *obj, const char *name,
1562                                     uint16List **list, Error **errp)
1563 {
1564     Error *err = NULL;
1565     Visitor *v;
1566     char *str;
1567
1568     v = string_output_visitor_new(false, &str);
1569     object_property_get(obj, v, name, &err);
1570     if (err) {
1571         error_propagate(errp, err);
1572         goto out;
1573     }
1574     visit_complete(v, &str);
1575     visit_free(v);
1576     v = string_input_visitor_new(str);
1577     visit_type_uint16List(v, NULL, list, errp);
1578
1579     g_free(str);
1580 out:
1581     visit_free(v);
1582 }
1583
1584 void object_property_parse(Object *obj, const char *string,
1585                            const char *name, Error **errp)
1586 {
1587     Visitor *v = string_input_visitor_new(string);
1588     object_property_set(obj, v, name, errp);
1589     visit_free(v);
1590 }
1591
1592 char *object_property_print(Object *obj, const char *name, bool human,
1593                             Error **errp)
1594 {
1595     Visitor *v;
1596     char *string = NULL;
1597     Error *local_err = NULL;
1598
1599     v = string_output_visitor_new(human, &string);
1600     object_property_get(obj, v, name, &local_err);
1601     if (local_err) {
1602         error_propagate(errp, local_err);
1603         goto out;
1604     }
1605
1606     visit_complete(v, &string);
1607
1608 out:
1609     visit_free(v);
1610     return string;
1611 }
1612
1613 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1614 {
1615     ObjectProperty *prop = object_property_find(obj, name, errp);
1616     if (prop == NULL) {
1617         return NULL;
1618     }
1619
1620     return prop->type;
1621 }
1622
1623 Object *object_get_root(void)
1624 {
1625     static Object *root;
1626
1627     if (!root) {
1628         root = object_new("container");
1629     }
1630
1631     return root;
1632 }
1633
1634 Object *object_get_objects_root(void)
1635 {
1636     return container_get(object_get_root(), "/objects");
1637 }
1638
1639 Object *object_get_internal_root(void)
1640 {
1641     static Object *internal_root;
1642
1643     if (!internal_root) {
1644         internal_root = object_new("container");
1645     }
1646
1647     return internal_root;
1648 }
1649
1650 static void object_get_child_property(Object *obj, Visitor *v,
1651                                       const char *name, void *opaque,
1652                                       Error **errp)
1653 {
1654     Object *child = opaque;
1655     gchar *path;
1656
1657     path = object_get_canonical_path(child);
1658     visit_type_str(v, name, &path, errp);
1659     g_free(path);
1660 }
1661
1662 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1663 {
1664     return opaque;
1665 }
1666
1667 static void object_finalize_child_property(Object *obj, const char *name,
1668                                            void *opaque)
1669 {
1670     Object *child = opaque;
1671
1672     if (child->class->unparent) {
1673         (child->class->unparent)(child);
1674     }
1675     child->parent = NULL;
1676     object_unref(child);
1677 }
1678
1679 void object_property_add_child(Object *obj, const char *name,
1680                                Object *child, Error **errp)
1681 {
1682     Error *local_err = NULL;
1683     gchar *type;
1684     ObjectProperty *op;
1685
1686     if (child->parent != NULL) {
1687         error_setg(errp, "child object is already parented");
1688         return;
1689     }
1690
1691     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1692
1693     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1694                              object_finalize_child_property, child, &local_err);
1695     if (local_err) {
1696         error_propagate(errp, local_err);
1697         goto out;
1698     }
1699
1700     op->resolve = object_resolve_child_property;
1701     object_ref(child);
1702     child->parent = obj;
1703
1704 out:
1705     g_free(type);
1706 }
1707
1708 void object_property_allow_set_link(const Object *obj, const char *name,
1709                                     Object *val, Error **errp)
1710 {
1711     /* Allow the link to be set, always */
1712 }
1713
1714 typedef struct {
1715     union {
1716         Object **targetp;
1717         Object *target; /* if OBJ_PROP_LINK_DIRECT, when holding the pointer  */
1718         ptrdiff_t offset; /* if OBJ_PROP_LINK_CLASS */
1719     };
1720     void (*check)(const Object *, const char *, Object *, Error **);
1721     ObjectPropertyLinkFlags flags;
1722 } LinkProperty;
1723
1724 static Object **
1725 object_link_get_targetp(Object *obj, LinkProperty *lprop)
1726 {
1727     if (lprop->flags & OBJ_PROP_LINK_DIRECT) {
1728         return &lprop->target;
1729     } else if (lprop->flags & OBJ_PROP_LINK_CLASS) {
1730         return (void *)obj + lprop->offset;
1731     } else {
1732         return lprop->targetp;
1733     }
1734 }
1735
1736 static void object_get_link_property(Object *obj, Visitor *v,
1737                                      const char *name, void *opaque,
1738                                      Error **errp)
1739 {
1740     LinkProperty *lprop = opaque;
1741     Object **targetp = object_link_get_targetp(obj, lprop);
1742     gchar *path;
1743
1744     if (*targetp) {
1745         path = object_get_canonical_path(*targetp);
1746         visit_type_str(v, name, &path, errp);
1747         g_free(path);
1748     } else {
1749         path = (gchar *)"";
1750         visit_type_str(v, name, &path, errp);
1751     }
1752 }
1753
1754 /*
1755  * object_resolve_link:
1756  *
1757  * Lookup an object and ensure its type matches the link property type.  This
1758  * is similar to object_resolve_path() except type verification against the
1759  * link property is performed.
1760  *
1761  * Returns: The matched object or NULL on path lookup failures.
1762  */
1763 static Object *object_resolve_link(Object *obj, const char *name,
1764                                    const char *path, Error **errp)
1765 {
1766     const char *type;
1767     gchar *target_type;
1768     bool ambiguous = false;
1769     Object *target;
1770
1771     /* Go from link<FOO> to FOO.  */
1772     type = object_property_get_type(obj, name, NULL);
1773     target_type = g_strndup(&type[5], strlen(type) - 6);
1774     target = object_resolve_path_type(path, target_type, &ambiguous);
1775
1776     if (ambiguous) {
1777         error_setg(errp, "Path '%s' does not uniquely identify an object",
1778                    path);
1779     } else if (!target) {
1780         target = object_resolve_path(path, &ambiguous);
1781         if (target || ambiguous) {
1782             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1783         } else {
1784             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1785                       "Device '%s' not found", path);
1786         }
1787         target = NULL;
1788     }
1789     g_free(target_type);
1790
1791     return target;
1792 }
1793
1794 static void object_set_link_property(Object *obj, Visitor *v,
1795                                      const char *name, void *opaque,
1796                                      Error **errp)
1797 {
1798     Error *local_err = NULL;
1799     LinkProperty *prop = opaque;
1800     Object **targetp = object_link_get_targetp(obj, prop);
1801     Object *old_target = *targetp;
1802     Object *new_target = NULL;
1803     char *path = NULL;
1804
1805     visit_type_str(v, name, &path, &local_err);
1806
1807     if (!local_err && strcmp(path, "") != 0) {
1808         new_target = object_resolve_link(obj, name, path, &local_err);
1809     }
1810
1811     g_free(path);
1812     if (local_err) {
1813         error_propagate(errp, local_err);
1814         return;
1815     }
1816
1817     prop->check(obj, name, new_target, &local_err);
1818     if (local_err) {
1819         error_propagate(errp, local_err);
1820         return;
1821     }
1822
1823     *targetp = new_target;
1824     if (prop->flags & OBJ_PROP_LINK_STRONG) {
1825         object_ref(new_target);
1826         object_unref(old_target);
1827     }
1828 }
1829
1830 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1831 {
1832     LinkProperty *lprop = opaque;
1833
1834     return *object_link_get_targetp(parent, lprop);
1835 }
1836
1837 static void object_release_link_property(Object *obj, const char *name,
1838                                          void *opaque)
1839 {
1840     LinkProperty *prop = opaque;
1841     Object **targetp = object_link_get_targetp(obj, prop);
1842
1843     if ((prop->flags & OBJ_PROP_LINK_STRONG) && *targetp) {
1844         object_unref(*targetp);
1845     }
1846     if (!(prop->flags & OBJ_PROP_LINK_CLASS)) {
1847         g_free(prop);
1848     }
1849 }
1850
1851 static void object_add_link_prop(Object *obj, const char *name,
1852                                  const char *type, void *ptr,
1853                                  void (*check)(const Object *, const char *,
1854                                                Object *, Error **),
1855                                  ObjectPropertyLinkFlags flags,
1856                                  Error **errp)
1857 {
1858     Error *local_err = NULL;
1859     LinkProperty *prop = g_malloc(sizeof(*prop));
1860     gchar *full_type;
1861     ObjectProperty *op;
1862
1863     if (flags & OBJ_PROP_LINK_DIRECT) {
1864         prop->target = ptr;
1865     } else {
1866         prop->targetp = ptr;
1867     }
1868     prop->check = check;
1869     prop->flags = flags;
1870
1871     full_type = g_strdup_printf("link<%s>", type);
1872
1873     op = object_property_add(obj, name, full_type,
1874                              object_get_link_property,
1875                              check ? object_set_link_property : NULL,
1876                              object_release_link_property,
1877                              prop,
1878                              &local_err);
1879     if (local_err) {
1880         error_propagate(errp, local_err);
1881         g_free(prop);
1882         goto out;
1883     }
1884
1885     op->resolve = object_resolve_link_property;
1886
1887 out:
1888     g_free(full_type);
1889 }
1890
1891 void object_property_add_link(Object *obj, const char *name,
1892                               const char *type, Object **targetp,
1893                               void (*check)(const Object *, const char *,
1894                                             Object *, Error **),
1895                               ObjectPropertyLinkFlags flags,
1896                               Error **errp)
1897 {
1898     object_add_link_prop(obj, name, type, targetp, check, flags, errp);
1899 }
1900
1901 ObjectProperty *
1902 object_class_property_add_link(ObjectClass *oc,
1903     const char *name,
1904     const char *type, ptrdiff_t offset,
1905     void (*check)(const Object *obj, const char *name,
1906                   Object *val, Error **errp),
1907     ObjectPropertyLinkFlags flags,
1908     Error **errp)
1909 {
1910     Error *local_err = NULL;
1911     LinkProperty *prop = g_new0(LinkProperty, 1);
1912     gchar *full_type;
1913     ObjectProperty *op;
1914
1915     prop->offset = offset;
1916     prop->check = check;
1917     prop->flags = flags | OBJ_PROP_LINK_CLASS;
1918
1919     full_type = g_strdup_printf("link<%s>", type);
1920
1921     op = object_class_property_add(oc, name, full_type,
1922                                    object_get_link_property,
1923                                    check ? object_set_link_property : NULL,
1924                                    object_release_link_property,
1925                                    prop,
1926                                    &local_err);
1927     if (local_err) {
1928         error_propagate(errp, local_err);
1929         g_free(prop);
1930         goto out;
1931     }
1932
1933     op->resolve = object_resolve_link_property;
1934
1935 out:
1936     g_free(full_type);
1937     return op;
1938 }
1939
1940 void object_property_add_const_link(Object *obj, const char *name,
1941                                     Object *target, Error **errp)
1942 {
1943     object_add_link_prop(obj, name, object_get_typename(target), target,
1944                          NULL, OBJ_PROP_LINK_DIRECT, errp);
1945 }
1946
1947 gchar *object_get_canonical_path_component(Object *obj)
1948 {
1949     ObjectProperty *prop = NULL;
1950     GHashTableIter iter;
1951
1952     if (obj->parent == NULL) {
1953         return NULL;
1954     }
1955
1956     g_hash_table_iter_init(&iter, obj->parent->properties);
1957     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1958         if (!object_property_is_child(prop)) {
1959             continue;
1960         }
1961
1962         if (prop->opaque == obj) {
1963             return g_strdup(prop->name);
1964         }
1965     }
1966
1967     /* obj had a parent but was not a child, should never happen */
1968     g_assert_not_reached();
1969     return NULL;
1970 }
1971
1972 gchar *object_get_canonical_path(Object *obj)
1973 {
1974     Object *root = object_get_root();
1975     char *newpath, *path = NULL;
1976
1977     if (obj == root) {
1978         return g_strdup("/");
1979     }
1980
1981     do {
1982         char *component = object_get_canonical_path_component(obj);
1983
1984         if (!component) {
1985             /* A canonical path must be complete, so discard what was
1986              * collected so far.
1987              */
1988             g_free(path);
1989             return NULL;
1990         }
1991
1992         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
1993         g_free(path);
1994         g_free(component);
1995         path = newpath;
1996         obj = obj->parent;
1997     } while (obj != root);
1998
1999     return path;
2000 }
2001
2002 Object *object_resolve_path_component(Object *parent, const gchar *part)
2003 {
2004     ObjectProperty *prop = object_property_find(parent, part, NULL);
2005     if (prop == NULL) {
2006         return NULL;
2007     }
2008
2009     if (prop->resolve) {
2010         return prop->resolve(parent, prop->opaque, part);
2011     } else {
2012         return NULL;
2013     }
2014 }
2015
2016 static Object *object_resolve_abs_path(Object *parent,
2017                                           gchar **parts,
2018                                           const char *typename,
2019                                           int index)
2020 {
2021     Object *child;
2022
2023     if (parts[index] == NULL) {
2024         return object_dynamic_cast(parent, typename);
2025     }
2026
2027     if (strcmp(parts[index], "") == 0) {
2028         return object_resolve_abs_path(parent, parts, typename, index + 1);
2029     }
2030
2031     child = object_resolve_path_component(parent, parts[index]);
2032     if (!child) {
2033         return NULL;
2034     }
2035
2036     return object_resolve_abs_path(child, parts, typename, index + 1);
2037 }
2038
2039 static Object *object_resolve_partial_path(Object *parent,
2040                                               gchar **parts,
2041                                               const char *typename,
2042                                               bool *ambiguous)
2043 {
2044     Object *obj;
2045     GHashTableIter iter;
2046     ObjectProperty *prop;
2047
2048     obj = object_resolve_abs_path(parent, parts, typename, 0);
2049
2050     g_hash_table_iter_init(&iter, parent->properties);
2051     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
2052         Object *found;
2053
2054         if (!object_property_is_child(prop)) {
2055             continue;
2056         }
2057
2058         found = object_resolve_partial_path(prop->opaque, parts,
2059                                             typename, ambiguous);
2060         if (found) {
2061             if (obj) {
2062                 *ambiguous = true;
2063                 return NULL;
2064             }
2065             obj = found;
2066         }
2067
2068         if (*ambiguous) {
2069             return NULL;
2070         }
2071     }
2072
2073     return obj;
2074 }
2075
2076 Object *object_resolve_path_type(const char *path, const char *typename,
2077                                  bool *ambiguousp)
2078 {
2079     Object *obj;
2080     gchar **parts;
2081
2082     parts = g_strsplit(path, "/", 0);
2083     assert(parts);
2084
2085     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
2086         bool ambiguous = false;
2087         obj = object_resolve_partial_path(object_get_root(), parts,
2088                                           typename, &ambiguous);
2089         if (ambiguousp) {
2090             *ambiguousp = ambiguous;
2091         }
2092     } else {
2093         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
2094     }
2095
2096     g_strfreev(parts);
2097
2098     return obj;
2099 }
2100
2101 Object *object_resolve_path(const char *path, bool *ambiguous)
2102 {
2103     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
2104 }
2105
2106 typedef struct StringProperty
2107 {
2108     char *(*get)(Object *, Error **);
2109     void (*set)(Object *, const char *, Error **);
2110 } StringProperty;
2111
2112 static void property_get_str(Object *obj, Visitor *v, const char *name,
2113                              void *opaque, Error **errp)
2114 {
2115     StringProperty *prop = opaque;
2116     char *value;
2117     Error *err = NULL;
2118
2119     value = prop->get(obj, &err);
2120     if (err) {
2121         error_propagate(errp, err);
2122         return;
2123     }
2124
2125     visit_type_str(v, name, &value, errp);
2126     g_free(value);
2127 }
2128
2129 static void property_set_str(Object *obj, Visitor *v, const char *name,
2130                              void *opaque, Error **errp)
2131 {
2132     StringProperty *prop = opaque;
2133     char *value;
2134     Error *local_err = NULL;
2135
2136     visit_type_str(v, name, &value, &local_err);
2137     if (local_err) {
2138         error_propagate(errp, local_err);
2139         return;
2140     }
2141
2142     prop->set(obj, value, errp);
2143     g_free(value);
2144 }
2145
2146 static void property_release_str(Object *obj, const char *name,
2147                                  void *opaque)
2148 {
2149     StringProperty *prop = opaque;
2150     g_free(prop);
2151 }
2152
2153 void object_property_add_str(Object *obj, const char *name,
2154                            char *(*get)(Object *, Error **),
2155                            void (*set)(Object *, const char *, Error **),
2156                            Error **errp)
2157 {
2158     Error *local_err = NULL;
2159     StringProperty *prop = g_malloc0(sizeof(*prop));
2160
2161     prop->get = get;
2162     prop->set = set;
2163
2164     object_property_add(obj, name, "string",
2165                         get ? property_get_str : NULL,
2166                         set ? property_set_str : NULL,
2167                         property_release_str,
2168                         prop, &local_err);
2169     if (local_err) {
2170         error_propagate(errp, local_err);
2171         g_free(prop);
2172     }
2173 }
2174
2175 ObjectProperty *
2176 object_class_property_add_str(ObjectClass *klass, const char *name,
2177                                    char *(*get)(Object *, Error **),
2178                                    void (*set)(Object *, const char *,
2179                                                Error **),
2180                                    Error **errp)
2181 {
2182     Error *local_err = NULL;
2183     StringProperty *prop = g_malloc0(sizeof(*prop));
2184     ObjectProperty *rv;
2185
2186     prop->get = get;
2187     prop->set = set;
2188
2189     rv = object_class_property_add(klass, name, "string",
2190                               get ? property_get_str : NULL,
2191                               set ? property_set_str : NULL,
2192                               NULL,
2193                               prop, &local_err);
2194     if (local_err) {
2195         error_propagate(errp, local_err);
2196         g_free(prop);
2197     }
2198
2199     return rv;
2200 }
2201
2202 typedef struct BoolProperty
2203 {
2204     bool (*get)(Object *, Error **);
2205     void (*set)(Object *, bool, Error **);
2206 } BoolProperty;
2207
2208 static void property_get_bool(Object *obj, Visitor *v, const char *name,
2209                               void *opaque, Error **errp)
2210 {
2211     BoolProperty *prop = opaque;
2212     bool value;
2213     Error *err = NULL;
2214
2215     value = prop->get(obj, &err);
2216     if (err) {
2217         error_propagate(errp, err);
2218         return;
2219     }
2220
2221     visit_type_bool(v, name, &value, errp);
2222 }
2223
2224 static void property_set_bool(Object *obj, Visitor *v, const char *name,
2225                               void *opaque, Error **errp)
2226 {
2227     BoolProperty *prop = opaque;
2228     bool value;
2229     Error *local_err = NULL;
2230
2231     visit_type_bool(v, name, &value, &local_err);
2232     if (local_err) {
2233         error_propagate(errp, local_err);
2234         return;
2235     }
2236
2237     prop->set(obj, value, errp);
2238 }
2239
2240 static void property_release_bool(Object *obj, const char *name,
2241                                   void *opaque)
2242 {
2243     BoolProperty *prop = opaque;
2244     g_free(prop);
2245 }
2246
2247 void object_property_add_bool(Object *obj, const char *name,
2248                               bool (*get)(Object *, Error **),
2249                               void (*set)(Object *, bool, Error **),
2250                               Error **errp)
2251 {
2252     Error *local_err = NULL;
2253     BoolProperty *prop = g_malloc0(sizeof(*prop));
2254
2255     prop->get = get;
2256     prop->set = set;
2257
2258     object_property_add(obj, name, "bool",
2259                         get ? property_get_bool : NULL,
2260                         set ? property_set_bool : NULL,
2261                         property_release_bool,
2262                         prop, &local_err);
2263     if (local_err) {
2264         error_propagate(errp, local_err);
2265         g_free(prop);
2266     }
2267 }
2268
2269 ObjectProperty *
2270 object_class_property_add_bool(ObjectClass *klass, const char *name,
2271                                     bool (*get)(Object *, Error **),
2272                                     void (*set)(Object *, bool, Error **),
2273                                     Error **errp)
2274 {
2275     Error *local_err = NULL;
2276     BoolProperty *prop = g_malloc0(sizeof(*prop));
2277     ObjectProperty *rv;
2278
2279     prop->get = get;
2280     prop->set = set;
2281
2282     rv = object_class_property_add(klass, name, "bool",
2283                               get ? property_get_bool : NULL,
2284                               set ? property_set_bool : NULL,
2285                               NULL,
2286                               prop, &local_err);
2287     if (local_err) {
2288         error_propagate(errp, local_err);
2289         g_free(prop);
2290     }
2291
2292     return rv;
2293 }
2294
2295 static void property_get_enum(Object *obj, Visitor *v, const char *name,
2296                               void *opaque, Error **errp)
2297 {
2298     EnumProperty *prop = opaque;
2299     int value;
2300     Error *err = NULL;
2301
2302     value = prop->get(obj, &err);
2303     if (err) {
2304         error_propagate(errp, err);
2305         return;
2306     }
2307
2308     visit_type_enum(v, name, &value, prop->lookup, errp);
2309 }
2310
2311 static void property_set_enum(Object *obj, Visitor *v, const char *name,
2312                               void *opaque, Error **errp)
2313 {
2314     EnumProperty *prop = opaque;
2315     int value;
2316     Error *err = NULL;
2317
2318     visit_type_enum(v, name, &value, prop->lookup, &err);
2319     if (err) {
2320         error_propagate(errp, err);
2321         return;
2322     }
2323     prop->set(obj, value, errp);
2324 }
2325
2326 static void property_release_enum(Object *obj, const char *name,
2327                                   void *opaque)
2328 {
2329     EnumProperty *prop = opaque;
2330     g_free(prop);
2331 }
2332
2333 void object_property_add_enum(Object *obj, const char *name,
2334                               const char *typename,
2335                               const QEnumLookup *lookup,
2336                               int (*get)(Object *, Error **),
2337                               void (*set)(Object *, int, Error **),
2338                               Error **errp)
2339 {
2340     Error *local_err = NULL;
2341     EnumProperty *prop = g_malloc(sizeof(*prop));
2342
2343     prop->lookup = lookup;
2344     prop->get = get;
2345     prop->set = set;
2346
2347     object_property_add(obj, name, typename,
2348                         get ? property_get_enum : NULL,
2349                         set ? property_set_enum : NULL,
2350                         property_release_enum,
2351                         prop, &local_err);
2352     if (local_err) {
2353         error_propagate(errp, local_err);
2354         g_free(prop);
2355     }
2356 }
2357
2358 ObjectProperty *
2359 object_class_property_add_enum(ObjectClass *klass, const char *name,
2360                                     const char *typename,
2361                                     const QEnumLookup *lookup,
2362                                     int (*get)(Object *, Error **),
2363                                     void (*set)(Object *, int, Error **),
2364                                     Error **errp)
2365 {
2366     Error *local_err = NULL;
2367     EnumProperty *prop = g_malloc(sizeof(*prop));
2368     ObjectProperty *rv;
2369
2370     prop->lookup = lookup;
2371     prop->get = get;
2372     prop->set = set;
2373
2374     rv = object_class_property_add(klass, name, typename,
2375                               get ? property_get_enum : NULL,
2376                               set ? property_set_enum : NULL,
2377                               NULL,
2378                               prop, &local_err);
2379     if (local_err) {
2380         error_propagate(errp, local_err);
2381         g_free(prop);
2382     }
2383
2384     return rv;
2385 }
2386
2387 typedef struct TMProperty {
2388     void (*get)(Object *, struct tm *, Error **);
2389 } TMProperty;
2390
2391 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2392                             void *opaque, Error **errp)
2393 {
2394     TMProperty *prop = opaque;
2395     Error *err = NULL;
2396     struct tm value;
2397
2398     prop->get(obj, &value, &err);
2399     if (err) {
2400         goto out;
2401     }
2402
2403     visit_start_struct(v, name, NULL, 0, &err);
2404     if (err) {
2405         goto out;
2406     }
2407     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2408     if (err) {
2409         goto out_end;
2410     }
2411     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2412     if (err) {
2413         goto out_end;
2414     }
2415     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2416     if (err) {
2417         goto out_end;
2418     }
2419     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2420     if (err) {
2421         goto out_end;
2422     }
2423     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2424     if (err) {
2425         goto out_end;
2426     }
2427     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2428     if (err) {
2429         goto out_end;
2430     }
2431     visit_check_struct(v, &err);
2432 out_end:
2433     visit_end_struct(v, NULL);
2434 out:
2435     error_propagate(errp, err);
2436
2437 }
2438
2439 static void property_release_tm(Object *obj, const char *name,
2440                                 void *opaque)
2441 {
2442     TMProperty *prop = opaque;
2443     g_free(prop);
2444 }
2445
2446 void object_property_add_tm(Object *obj, const char *name,
2447                             void (*get)(Object *, struct tm *, Error **),
2448                             Error **errp)
2449 {
2450     Error *local_err = NULL;
2451     TMProperty *prop = g_malloc0(sizeof(*prop));
2452
2453     prop->get = get;
2454
2455     object_property_add(obj, name, "struct tm",
2456                         get ? property_get_tm : NULL, NULL,
2457                         property_release_tm,
2458                         prop, &local_err);
2459     if (local_err) {
2460         error_propagate(errp, local_err);
2461         g_free(prop);
2462     }
2463 }
2464
2465 ObjectProperty *
2466 object_class_property_add_tm(ObjectClass *klass, const char *name,
2467                                   void (*get)(Object *, struct tm *, Error **),
2468                                   Error **errp)
2469 {
2470     Error *local_err = NULL;
2471     TMProperty *prop = g_malloc0(sizeof(*prop));
2472     ObjectProperty *rv;
2473
2474     prop->get = get;
2475
2476     rv = object_class_property_add(klass, name, "struct tm",
2477                               get ? property_get_tm : NULL, NULL,
2478                               NULL,
2479                               prop, &local_err);
2480     if (local_err) {
2481         error_propagate(errp, local_err);
2482         g_free(prop);
2483     }
2484
2485     return rv;
2486 }
2487
2488 static char *qdev_get_type(Object *obj, Error **errp)
2489 {
2490     return g_strdup(object_get_typename(obj));
2491 }
2492
2493 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2494                                    void *opaque, Error **errp)
2495 {
2496     uint8_t value = *(uint8_t *)opaque;
2497     visit_type_uint8(v, name, &value, errp);
2498 }
2499
2500 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2501                                     void *opaque, Error **errp)
2502 {
2503     uint16_t value = *(uint16_t *)opaque;
2504     visit_type_uint16(v, name, &value, errp);
2505 }
2506
2507 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2508                                     void *opaque, Error **errp)
2509 {
2510     uint32_t value = *(uint32_t *)opaque;
2511     visit_type_uint32(v, name, &value, errp);
2512 }
2513
2514 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2515                                     void *opaque, Error **errp)
2516 {
2517     uint64_t value = *(uint64_t *)opaque;
2518     visit_type_uint64(v, name, &value, errp);
2519 }
2520
2521 void object_property_add_uint8_ptr(Object *obj, const char *name,
2522                                    const uint8_t *v, Error **errp)
2523 {
2524     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2525                         NULL, NULL, (void *)v, errp);
2526 }
2527
2528 ObjectProperty *
2529 object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2530                                          const uint8_t *v, Error **errp)
2531 {
2532     return object_class_property_add(klass, name, "uint8",
2533                                      property_get_uint8_ptr,
2534                                      NULL, NULL, (void *)v, errp);
2535 }
2536
2537 void object_property_add_uint16_ptr(Object *obj, const char *name,
2538                                     const uint16_t *v, Error **errp)
2539 {
2540     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2541                         NULL, NULL, (void *)v, errp);
2542 }
2543
2544 ObjectProperty *
2545 object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2546                                           const uint16_t *v, Error **errp)
2547 {
2548     return object_class_property_add(klass, name, "uint16",
2549                                      property_get_uint16_ptr,
2550                                      NULL, NULL, (void *)v, errp);
2551 }
2552
2553 void object_property_add_uint32_ptr(Object *obj, const char *name,
2554                                     const uint32_t *v, Error **errp)
2555 {
2556     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2557                         NULL, NULL, (void *)v, errp);
2558 }
2559
2560 ObjectProperty *
2561 object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2562                                           const uint32_t *v, Error **errp)
2563 {
2564     return object_class_property_add(klass, name, "uint32",
2565                                      property_get_uint32_ptr,
2566                                      NULL, NULL, (void *)v, errp);
2567 }
2568
2569 void object_property_add_uint64_ptr(Object *obj, const char *name,
2570                                     const uint64_t *v, Error **errp)
2571 {
2572     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2573                         NULL, NULL, (void *)v, errp);
2574 }
2575
2576 ObjectProperty *
2577 object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2578                                           const uint64_t *v, Error **errp)
2579 {
2580     return object_class_property_add(klass, name, "uint64",
2581                                      property_get_uint64_ptr,
2582                                      NULL, NULL, (void *)v, errp);
2583 }
2584
2585 typedef struct {
2586     Object *target_obj;
2587     char *target_name;
2588 } AliasProperty;
2589
2590 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2591                                void *opaque, Error **errp)
2592 {
2593     AliasProperty *prop = opaque;
2594
2595     object_property_get(prop->target_obj, v, prop->target_name, errp);
2596 }
2597
2598 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2599                                void *opaque, Error **errp)
2600 {
2601     AliasProperty *prop = opaque;
2602
2603     object_property_set(prop->target_obj, v, prop->target_name, errp);
2604 }
2605
2606 static Object *property_resolve_alias(Object *obj, void *opaque,
2607                                       const gchar *part)
2608 {
2609     AliasProperty *prop = opaque;
2610
2611     return object_resolve_path_component(prop->target_obj, prop->target_name);
2612 }
2613
2614 static void property_release_alias(Object *obj, const char *name, void *opaque)
2615 {
2616     AliasProperty *prop = opaque;
2617
2618     g_free(prop->target_name);
2619     g_free(prop);
2620 }
2621
2622 void object_property_add_alias(Object *obj, const char *name,
2623                                Object *target_obj, const char *target_name,
2624                                Error **errp)
2625 {
2626     AliasProperty *prop;
2627     ObjectProperty *op;
2628     ObjectProperty *target_prop;
2629     gchar *prop_type;
2630     Error *local_err = NULL;
2631
2632     target_prop = object_property_find(target_obj, target_name, errp);
2633     if (!target_prop) {
2634         return;
2635     }
2636
2637     if (object_property_is_child(target_prop)) {
2638         prop_type = g_strdup_printf("link%s",
2639                                     target_prop->type + strlen("child"));
2640     } else {
2641         prop_type = g_strdup(target_prop->type);
2642     }
2643
2644     prop = g_malloc(sizeof(*prop));
2645     prop->target_obj = target_obj;
2646     prop->target_name = g_strdup(target_name);
2647
2648     op = object_property_add(obj, name, prop_type,
2649                              property_get_alias,
2650                              property_set_alias,
2651                              property_release_alias,
2652                              prop, &local_err);
2653     if (local_err) {
2654         error_propagate(errp, local_err);
2655         g_free(prop);
2656         goto out;
2657     }
2658     op->resolve = property_resolve_alias;
2659     if (target_prop->defval) {
2660         op->defval = qobject_ref(target_prop->defval);
2661     }
2662
2663     object_property_set_description(obj, op->name,
2664                                     target_prop->description,
2665                                     &error_abort);
2666
2667 out:
2668     g_free(prop_type);
2669 }
2670
2671 void object_property_set_description(Object *obj, const char *name,
2672                                      const char *description, Error **errp)
2673 {
2674     ObjectProperty *op;
2675
2676     op = object_property_find(obj, name, errp);
2677     if (!op) {
2678         return;
2679     }
2680
2681     g_free(op->description);
2682     op->description = g_strdup(description);
2683 }
2684
2685 void object_class_property_set_description(ObjectClass *klass,
2686                                            const char *name,
2687                                            const char *description,
2688                                            Error **errp)
2689 {
2690     ObjectProperty *op;
2691
2692     op = g_hash_table_lookup(klass->properties, name);
2693     if (!op) {
2694         error_setg(errp, "Property '.%s' not found", name);
2695         return;
2696     }
2697
2698     g_free(op->description);
2699     op->description = g_strdup(description);
2700 }
2701
2702 static void object_class_init(ObjectClass *klass, void *data)
2703 {
2704     object_class_property_add_str(klass, "type", qdev_get_type,
2705                                   NULL, &error_abort);
2706 }
2707
2708 static void register_types(void)
2709 {
2710     static TypeInfo interface_info = {
2711         .name = TYPE_INTERFACE,
2712         .class_size = sizeof(InterfaceClass),
2713         .abstract = true,
2714     };
2715
2716     static TypeInfo object_info = {
2717         .name = TYPE_OBJECT,
2718         .instance_size = sizeof(Object),
2719         .class_init = object_class_init,
2720         .abstract = true,
2721     };
2722
2723     type_interface = type_register_internal(&interface_info);
2724     type_register_internal(&object_info);
2725 }
2726
2727 type_init(register_types)