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 "qom/object.h"
  14 #include "qom/object_interfaces.h"
  15 #include "qemu-common.h"
  16 #include "qapi/visitor.h"
  17 #include "qapi-visit.h"
  18 #include "qapi/string-input-visitor.h"
  19 #include "qapi/string-output-visitor.h"
  20 #include "qapi/qmp/qerror.h"
  21 #include "trace.h"
  22
  23 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  24  * of the QOM core on QObject?  */
  25 #include "qom/qom-qobject.h"
  26 #include "qapi/qmp/qobject.h"
  27 #include "qapi/qmp/qbool.h"
  28 #include "qapi/qmp/qint.h"
  29 #include "qapi/qmp/qstring.h"
  30
  31 #define MAX_INTERFACES 32
  32
  33 typedef struct InterfaceImpl InterfaceImpl;
  34 typedef struct TypeImpl TypeImpl;
  35
  36 struct InterfaceImpl
  37 {
  38     const char *typename;
  39 };
  40
  41 struct TypeImpl
  42 {
  43     const char *name;
  44
  45     size_t class_size;
  46
  47     size_t instance_size;
  48
  49     void (*class_init)(ObjectClass *klass, void *data);
  50     void (*class_base_init)(ObjectClass *klass, void *data);
  51     void (*class_finalize)(ObjectClass *klass, void *data);
  52
  53     void *class_data;
  54
  55     void (*instance_init)(Object *obj);
  56     void (*instance_post_init)(Object *obj);
  57     void (*instance_finalize)(Object *obj);
  58
  59     bool abstract;
  60
  61     const char *parent;
  62     TypeImpl *parent_type;
  63
  64     ObjectClass *class;
  65
  66     int num_interfaces;
  67     InterfaceImpl interfaces[MAX_INTERFACES];
  68 };
  69
  70 static Type type_interface;
  71
  72 static GHashTable *type_table_get(void)
  73 {
  74     static GHashTable *type_table;
  75
  76     if (type_table == NULL) {
  77         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  78     }
  79
  80     return type_table;
  81 }
  82
  83 static bool enumerating_types;
  84
  85 static void type_table_add(TypeImpl *ti)
  86 {
  87     assert(!enumerating_types);
  88     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  89 }
  90
  91 static TypeImpl *type_table_lookup(const char *name)
  92 {
  93     return g_hash_table_lookup(type_table_get(), name);
  94 }
  95
  96 static TypeImpl *type_new(const TypeInfo *info)
  97 {
  98     TypeImpl *ti = g_malloc0(sizeof(*ti));
  99     int i;
 100
 101     g_assert(info->name != NULL);
 102
 103     if (type_table_lookup(info->name) != NULL) {
 104         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 105         abort();
 106     }
 107
 108     ti->name = g_strdup(info->name);
 109     ti->parent = g_strdup(info->parent);
 110
 111     ti->class_size = info->class_size;
 112     ti->instance_size = info->instance_size;
 113
 114     ti->class_init = info->class_init;
 115     ti->class_base_init = info->class_base_init;
 116     ti->class_finalize = info->class_finalize;
 117     ti->class_data = info->class_data;
 118
 119     ti->instance_init = info->instance_init;
 120     ti->instance_post_init = info->instance_post_init;
 121     ti->instance_finalize = info->instance_finalize;
 122
 123     ti->abstract = info->abstract;
 124
 125     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 126         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 127     }
 128     ti->num_interfaces = i;
 129
 130     return ti;
 131 }
 132
 133 static TypeImpl *type_register_internal(const TypeInfo *info)
 134 {
 135     TypeImpl *ti;
 136     ti = type_new(info);
 137
 138     type_table_add(ti);
 139     return ti;
 140 }
 141
 142 TypeImpl *type_register(const TypeInfo *info)
 143 {
 144     assert(info->parent);
 145     return type_register_internal(info);
 146 }
 147
 148 TypeImpl *type_register_static(const TypeInfo *info)
 149 {
 150     return type_register(info);
 151 }
 152
 153 static TypeImpl *type_get_by_name(const char *name)
 154 {
 155     if (name == NULL) {
 156         return NULL;
 157     }
 158
 159     return type_table_lookup(name);
 160 }
 161
 162 static TypeImpl *type_get_parent(TypeImpl *type)
 163 {
 164     if (!type->parent_type && type->parent) {
 165         type->parent_type = type_get_by_name(type->parent);
 166         g_assert(type->parent_type != NULL);
 167     }
 168
 169     return type->parent_type;
 170 }
 171
 172 static bool type_has_parent(TypeImpl *type)
 173 {
 174     return (type->parent != NULL);
 175 }
 176
 177 static size_t type_class_get_size(TypeImpl *ti)
 178 {
 179     if (ti->class_size) {
 180         return ti->class_size;
 181     }
 182
 183     if (type_has_parent(ti)) {
 184         return type_class_get_size(type_get_parent(ti));
 185     }
 186
 187     return sizeof(ObjectClass);
 188 }
 189
 190 static size_t type_object_get_size(TypeImpl *ti)
 191 {
 192     if (ti->instance_size) {
 193         return ti->instance_size;
 194     }
 195
 196     if (type_has_parent(ti)) {
 197         return type_object_get_size(type_get_parent(ti));
 198     }
 199
 200     return 0;
 201 }
 202
 203 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 204 {
 205     assert(target_type);
 206
 207     /* Check if typename is a direct ancestor of type */
 208     while (type) {
 209         if (type == target_type) {
 210             return true;
 211         }
 212
 213         type = type_get_parent(type);
 214     }
 215
 216     return false;
 217 }
 218
 219 static void type_initialize(TypeImpl *ti);
 220
 221 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 222                                       TypeImpl *parent_type)
 223 {
 224     InterfaceClass *new_iface;
 225     TypeInfo info = { };
 226     TypeImpl *iface_impl;
 227
 228     info.parent = parent_type->name;
 229     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 230     info.abstract = true;
 231
 232     iface_impl = type_new(&info);
 233     iface_impl->parent_type = parent_type;
 234     type_initialize(iface_impl);
 235     g_free((char *)info.name);
 236
 237     new_iface = (InterfaceClass *)iface_impl->class;
 238     new_iface->concrete_class = ti->class;
 239     new_iface->interface_type = interface_type;
 240
 241     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 242                                            iface_impl->class);
 243 }
 244
 245 static void type_initialize(TypeImpl *ti)
 246 {
 247     TypeImpl *parent;
 248
 249     if (ti->class) {
 250         return;
 251     }
 252
 253     ti->class_size = type_class_get_size(ti);
 254     ti->instance_size = type_object_get_size(ti);
 255
 256     ti->class = g_malloc0(ti->class_size);
 257
 258     parent = type_get_parent(ti);
 259     if (parent) {
 260         type_initialize(parent);
 261         GSList *e;
 262         int i;
 263
 264         g_assert(parent->class_size <= ti->class_size);
 265         memcpy(ti->class, parent->class, parent->class_size);
 266         ti->class->interfaces = NULL;
 267
 268         for (e = parent->class->interfaces; e; e = e->next) {
 269             InterfaceClass *iface = e->data;
 270             ObjectClass *klass = OBJECT_CLASS(iface);
 271
 272             type_initialize_interface(ti, iface->interface_type, klass->type);
 273         }
 274
 275         for (i = 0; i < ti->num_interfaces; i++) {
 276             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 277             for (e = ti->class->interfaces; e; e = e->next) {
 278                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 279
 280                 if (type_is_ancestor(target_type, t)) {
 281                     break;
 282                 }
 283             }
 284
 285             if (e) {
 286                 continue;
 287             }
 288
 289             type_initialize_interface(ti, t, t);
 290         }
 291     }
 292
 293     ti->class->type = ti;
 294
 295     while (parent) {
 296         if (parent->class_base_init) {
 297             parent->class_base_init(ti->class, ti->class_data);
 298         }
 299         parent = type_get_parent(parent);
 300     }
 301
 302     if (ti->class_init) {
 303         ti->class_init(ti->class, ti->class_data);
 304     }
 305 }
 306
 307 static void object_init_with_type(Object *obj, TypeImpl *ti)
 308 {
 309     if (type_has_parent(ti)) {
 310         object_init_with_type(obj, type_get_parent(ti));
 311     }
 312
 313     if (ti->instance_init) {
 314         ti->instance_init(obj);
 315     }
 316 }
 317
 318 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 319 {
 320     if (ti->instance_post_init) {
 321         ti->instance_post_init(obj);
 322     }
 323
 324     if (type_has_parent(ti)) {
 325         object_post_init_with_type(obj, type_get_parent(ti));
 326     }
 327 }
 328
 329 void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 330 {
 331     Object *obj = data;
 332
 333     g_assert(type != NULL);
 334     type_initialize(type);
 335
 336     g_assert(type->instance_size >= sizeof(Object));
 337     g_assert(type->abstract == false);
 338     g_assert(size >= type->instance_size);
 339
 340     memset(obj, 0, type->instance_size);
 341     obj->class = type->class;
 342     object_ref(obj);
 343     QTAILQ_INIT(&obj->properties);
 344     object_init_with_type(obj, type);
 345     object_post_init_with_type(obj, type);
 346 }
 347
 348 void object_initialize(void *data, size_t size, const char *typename)
 349 {
 350     TypeImpl *type = type_get_by_name(typename);
 351
 352     object_initialize_with_type(data, size, type);
 353 }
 354
 355 static inline bool object_property_is_child(ObjectProperty *prop)
 356 {
 357     return strstart(prop->type, "child<", NULL);
 358 }
 359
 360 static void object_property_del_all(Object *obj)
 361 {
 362     while (!QTAILQ_EMPTY(&obj->properties)) {
 363         ObjectProperty *prop = QTAILQ_FIRST(&obj->properties);
 364
 365         QTAILQ_REMOVE(&obj->properties, prop, node);
 366
 367         if (prop->release) {
 368             prop->release(obj, prop->name, prop->opaque);
 369         }
 370
 371         g_free(prop->name);
 372         g_free(prop->type);
 373         g_free(prop->description);
 374         g_free(prop);
 375     }
 376 }
 377
 378 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 379 {
 380     ObjectProperty *prop;
 381
 382     QTAILQ_FOREACH(prop, &obj->properties, node) {
 383         if (object_property_is_child(prop) && prop->opaque == child) {
 384             object_property_del(obj, prop->name, errp);
 385             break;
 386         }
 387     }
 388 }
 389
 390 void object_unparent(Object *obj)
 391 {
 392     if (obj->parent) {
 393         object_property_del_child(obj->parent, obj, NULL);
 394     }
 395 }
 396
 397 static void object_deinit(Object *obj, TypeImpl *type)
 398 {
 399     if (type->instance_finalize) {
 400         type->instance_finalize(obj);
 401     }
 402
 403     if (type_has_parent(type)) {
 404         object_deinit(obj, type_get_parent(type));
 405     }
 406 }
 407
 408 static void object_finalize(void *data)
 409 {
 410     Object *obj = data;
 411     TypeImpl *ti = obj->class->type;
 412
 413     object_property_del_all(obj);
 414     object_deinit(obj, ti);
 415
 416     g_assert(obj->ref == 0);
 417     if (obj->free) {
 418         obj->free(obj);
 419     }
 420 }
 421
 422 Object *object_new_with_type(Type type)
 423 {
 424     Object *obj;
 425
 426     g_assert(type != NULL);
 427     type_initialize(type);
 428
 429     obj = g_malloc(type->instance_size);
 430     object_initialize_with_type(obj, type->instance_size, type);
 431     obj->free = g_free;
 432
 433     return obj;
 434 }
 435
 436 Object *object_new(const char *typename)
 437 {
 438     TypeImpl *ti = type_get_by_name(typename);
 439
 440     return object_new_with_type(ti);
 441 }
 442
 443
 444 Object *object_new_with_props(const char *typename,
 445                               Object *parent,
 446                               const char *id,
 447                               Error **errp,
 448                               ...)
 449 {
 450     va_list vargs;
 451     Object *obj;
 452
 453     va_start(vargs, errp);
 454     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 455     va_end(vargs);
 456
 457     return obj;
 458 }
 459
 460
 461 Object *object_new_with_propv(const char *typename,
 462                               Object *parent,
 463                               const char *id,
 464                               Error **errp,
 465                               va_list vargs)
 466 {
 467     Object *obj;
 468     ObjectClass *klass;
 469     Error *local_err = NULL;
 470
 471     klass = object_class_by_name(typename);
 472     if (!klass) {
 473         error_setg(errp, "invalid object type: %s", typename);
 474         return NULL;
 475     }
 476
 477     if (object_class_is_abstract(klass)) {
 478         error_setg(errp, "object type '%s' is abstract", typename);
 479         return NULL;
 480     }
 481     obj = object_new(typename);
 482
 483     if (object_set_propv(obj, &local_err, vargs) < 0) {
 484         goto error;
 485     }
 486
 487     object_property_add_child(parent, id, obj, &local_err);
 488     if (local_err) {
 489         goto error;
 490     }
 491
 492     if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
 493         user_creatable_complete(obj, &local_err);
 494         if (local_err) {
 495             object_unparent(obj);
 496             goto error;
 497         }
 498     }
 499
 500     object_unref(OBJECT(obj));
 501     return obj;
 502
 503  error:
 504     if (local_err) {
 505         error_propagate(errp, local_err);
 506     }
 507     object_unref(obj);
 508     return NULL;
 509 }
 510
 511
 512 int object_set_props(Object *obj,
 513                      Error **errp,
 514                      ...)
 515 {
 516     va_list vargs;
 517     int ret;
 518
 519     va_start(vargs, errp);
 520     ret = object_set_propv(obj, errp, vargs);
 521     va_end(vargs);
 522
 523     return ret;
 524 }
 525
 526
 527 int object_set_propv(Object *obj,
 528                      Error **errp,
 529                      va_list vargs)
 530 {
 531     const char *propname;
 532     Error *local_err = NULL;
 533
 534     propname = va_arg(vargs, char *);
 535     while (propname != NULL) {
 536         const char *value = va_arg(vargs, char *);
 537
 538         g_assert(value != NULL);
 539         object_property_parse(obj, value, propname, &local_err);
 540         if (local_err) {
 541             error_propagate(errp, local_err);
 542             return -1;
 543         }
 544         propname = va_arg(vargs, char *);
 545     }
 546
 547     return 0;
 548 }
 549
 550
 551 Object *object_dynamic_cast(Object *obj, const char *typename)
 552 {
 553     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 554         return obj;
 555     }
 556
 557     return NULL;
 558 }
 559
 560 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 561                                    const char *file, int line, const char *func)
 562 {
 563     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 564                                      typename, file, line, func);
 565
 566 #ifdef CONFIG_QOM_CAST_DEBUG
 567     int i;
 568     Object *inst;
 569
 570     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 571         if (obj->class->object_cast_cache[i] == typename) {
 572             goto out;
 573         }
 574     }
 575
 576     inst = object_dynamic_cast(obj, typename);
 577
 578     if (!inst && obj) {
 579         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 580                 file, line, func, obj, typename);
 581         abort();
 582     }
 583
 584     assert(obj == inst);
 585
 586     if (obj && obj == inst) {
 587         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 588             obj->class->object_cast_cache[i - 1] =
 589                     obj->class->object_cast_cache[i];
 590         }
 591         obj->class->object_cast_cache[i - 1] = typename;
 592     }
 593
 594 out:
 595 #endif
 596     return obj;
 597 }
 598
 599 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 600                                        const char *typename)
 601 {
 602     ObjectClass *ret = NULL;
 603     TypeImpl *target_type;
 604     TypeImpl *type;
 605
 606     if (!class) {
 607         return NULL;
 608     }
 609
 610     /* A simple fast path that can trigger a lot for leaf classes.  */
 611     type = class->type;
 612     if (type->name == typename) {
 613         return class;
 614     }
 615
 616     target_type = type_get_by_name(typename);
 617     if (!target_type) {
 618         /* target class type unknown, so fail the cast */
 619         return NULL;
 620     }
 621
 622     if (type->class->interfaces &&
 623             type_is_ancestor(target_type, type_interface)) {
 624         int found = 0;
 625         GSList *i;
 626
 627         for (i = class->interfaces; i; i = i->next) {
 628             ObjectClass *target_class = i->data;
 629
 630             if (type_is_ancestor(target_class->type, target_type)) {
 631                 ret = target_class;
 632                 found++;
 633             }
 634          }
 635
 636         /* The match was ambiguous, don't allow a cast */
 637         if (found > 1) {
 638             ret = NULL;
 639         }
 640     } else if (type_is_ancestor(type, target_type)) {
 641         ret = class;
 642     }
 643
 644     return ret;
 645 }
 646
 647 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 648                                               const char *typename,
 649                                               const char *file, int line,
 650                                               const char *func)
 651 {
 652     ObjectClass *ret;
 653
 654     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 655                                            typename, file, line, func);
 656
 657 #ifdef CONFIG_QOM_CAST_DEBUG
 658     int i;
 659
 660     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 661         if (class->class_cast_cache[i] == typename) {
 662             ret = class;
 663             goto out;
 664         }
 665     }
 666 #else
 667     if (!class || !class->interfaces) {
 668         return class;
 669     }
 670 #endif
 671
 672     ret = object_class_dynamic_cast(class, typename);
 673     if (!ret && class) {
 674         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 675                 file, line, func, class, typename);
 676         abort();
 677     }
 678
 679 #ifdef CONFIG_QOM_CAST_DEBUG
 680     if (class && ret == class) {
 681         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 682             class->class_cast_cache[i - 1] = class->class_cast_cache[i];
 683         }
 684         class->class_cast_cache[i - 1] = typename;
 685     }
 686 out:
 687 #endif
 688     return ret;
 689 }
 690
 691 const char *object_get_typename(Object *obj)
 692 {
 693     return obj->class->type->name;
 694 }
 695
 696 ObjectClass *object_get_class(Object *obj)
 697 {
 698     return obj->class;
 699 }
 700
 701 bool object_class_is_abstract(ObjectClass *klass)
 702 {
 703     return klass->type->abstract;
 704 }
 705
 706 const char *object_class_get_name(ObjectClass *klass)
 707 {
 708     return klass->type->name;
 709 }
 710
 711 ObjectClass *object_class_by_name(const char *typename)
 712 {
 713     TypeImpl *type = type_get_by_name(typename);
 714
 715     if (!type) {
 716         return NULL;
 717     }
 718
 719     type_initialize(type);
 720
 721     return type->class;
 722 }
 723
 724 ObjectClass *object_class_get_parent(ObjectClass *class)
 725 {
 726     TypeImpl *type = type_get_parent(class->type);
 727
 728     if (!type) {
 729         return NULL;
 730     }
 731
 732     type_initialize(type);
 733
 734     return type->class;
 735 }
 736
 737 typedef struct OCFData
 738 {
 739     void (*fn)(ObjectClass *klass, void *opaque);
 740     const char *implements_type;
 741     bool include_abstract;
 742     void *opaque;
 743 } OCFData;
 744
 745 static void object_class_foreach_tramp(gpointer key, gpointer value,
 746                                        gpointer opaque)
 747 {
 748     OCFData *data = opaque;
 749     TypeImpl *type = value;
 750     ObjectClass *k;
 751
 752     type_initialize(type);
 753     k = type->class;
 754
 755     if (!data->include_abstract && type->abstract) {
 756         return;
 757     }
 758
 759     if (data->implements_type &&
 760         !object_class_dynamic_cast(k, data->implements_type)) {
 761         return;
 762     }
 763
 764     data->fn(k, data->opaque);
 765 }
 766
 767 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 768                           const char *implements_type, bool include_abstract,
 769                           void *opaque)
 770 {
 771     OCFData data = { fn, implements_type, include_abstract, opaque };
 772
 773     enumerating_types = true;
 774     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 775     enumerating_types = false;
 776 }
 777
 778 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 779                          void *opaque)
 780 {
 781     ObjectProperty *prop, *next;
 782     int ret = 0;
 783
 784     QTAILQ_FOREACH_SAFE(prop, &obj->properties, node, next) {
 785         if (object_property_is_child(prop)) {
 786             ret = fn(prop->opaque, opaque);
 787             if (ret != 0) {
 788                 break;
 789             }
 790         }
 791     }
 792     return ret;
 793 }
 794
 795 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 796 {
 797     GSList **list = opaque;
 798
 799     *list = g_slist_prepend(*list, klass);
 800 }
 801
 802 GSList *object_class_get_list(const char *implements_type,
 803                               bool include_abstract)
 804 {
 805     GSList *list = NULL;
 806
 807     object_class_foreach(object_class_get_list_tramp,
 808                          implements_type, include_abstract, &list);
 809     return list;
 810 }
 811
 812 void object_ref(Object *obj)
 813 {
 814     if (!obj) {
 815         return;
 816     }
 817      atomic_inc(&obj->ref);
 818 }
 819
 820 void object_unref(Object *obj)
 821 {
 822     if (!obj) {
 823         return;
 824     }
 825     g_assert(obj->ref > 0);
 826
 827     /* parent always holds a reference to its children */
 828     if (atomic_fetch_dec(&obj->ref) == 1) {
 829         object_finalize(obj);
 830     }
 831 }
 832
 833 ObjectProperty *
 834 object_property_add(Object *obj, const char *name, const char *type,
 835                     ObjectPropertyAccessor *get,
 836                     ObjectPropertyAccessor *set,
 837                     ObjectPropertyRelease *release,
 838                     void *opaque, Error **errp)
 839 {
 840     ObjectProperty *prop;
 841     size_t name_len = strlen(name);
 842
 843     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
 844         int i;
 845         ObjectProperty *ret;
 846         char *name_no_array = g_strdup(name);
 847
 848         name_no_array[name_len - 3] = '\0';
 849         for (i = 0; ; ++i) {
 850             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
 851
 852             ret = object_property_add(obj, full_name, type, get, set,
 853                                       release, opaque, NULL);
 854             g_free(full_name);
 855             if (ret) {
 856                 break;
 857             }
 858         }
 859         g_free(name_no_array);
 860         return ret;
 861     }
 862
 863     QTAILQ_FOREACH(prop, &obj->properties, node) {
 864         if (strcmp(prop->name, name) == 0) {
 865             error_setg(errp, "attempt to add duplicate property '%s'"
 866                        " to object (type '%s')", name,
 867                        object_get_typename(obj));
 868             return NULL;
 869         }
 870     }
 871
 872     prop = g_malloc0(sizeof(*prop));
 873
 874     prop->name = g_strdup(name);
 875     prop->type = g_strdup(type);
 876
 877     prop->get = get;
 878     prop->set = set;
 879     prop->release = release;
 880     prop->opaque = opaque;
 881
 882     QTAILQ_INSERT_TAIL(&obj->properties, prop, node);
 883     return prop;
 884 }
 885
 886 ObjectProperty *object_property_find(Object *obj, const char *name,
 887                                      Error **errp)
 888 {
 889     ObjectProperty *prop;
 890
 891     QTAILQ_FOREACH(prop, &obj->properties, node) {
 892         if (strcmp(prop->name, name) == 0) {
 893             return prop;
 894         }
 895     }
 896
 897     error_setg(errp, "Property '.%s' not found", name);
 898     return NULL;
 899 }
 900
 901 void object_property_del(Object *obj, const char *name, Error **errp)
 902 {
 903     ObjectProperty *prop = object_property_find(obj, name, errp);
 904     if (prop == NULL) {
 905         return;
 906     }
 907
 908     if (prop->release) {
 909         prop->release(obj, name, prop->opaque);
 910     }
 911
 912     QTAILQ_REMOVE(&obj->properties, prop, node);
 913
 914     g_free(prop->name);
 915     g_free(prop->type);
 916     g_free(prop->description);
 917     g_free(prop);
 918 }
 919
 920 void object_property_get(Object *obj, Visitor *v, const char *name,
 921                          Error **errp)
 922 {
 923     ObjectProperty *prop = object_property_find(obj, name, errp);
 924     if (prop == NULL) {
 925         return;
 926     }
 927
 928     if (!prop->get) {
 929         error_setg(errp, QERR_PERMISSION_DENIED);
 930     } else {
 931         prop->get(obj, v, prop->opaque, name, errp);
 932     }
 933 }
 934
 935 void object_property_set(Object *obj, Visitor *v, const char *name,
 936                          Error **errp)
 937 {
 938     ObjectProperty *prop = object_property_find(obj, name, errp);
 939     if (prop == NULL) {
 940         return;
 941     }
 942
 943     if (!prop->set) {
 944         error_setg(errp, QERR_PERMISSION_DENIED);
 945     } else {
 946         prop->set(obj, v, prop->opaque, name, errp);
 947     }
 948 }
 949
 950 void object_property_set_str(Object *obj, const char *value,
 951                              const char *name, Error **errp)
 952 {
 953     QString *qstr = qstring_from_str(value);
 954     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
 955
 956     QDECREF(qstr);
 957 }
 958
 959 char *object_property_get_str(Object *obj, const char *name,
 960                               Error **errp)
 961 {
 962     QObject *ret = object_property_get_qobject(obj, name, errp);
 963     QString *qstring;
 964     char *retval;
 965
 966     if (!ret) {
 967         return NULL;
 968     }
 969     qstring = qobject_to_qstring(ret);
 970     if (!qstring) {
 971         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
 972         retval = NULL;
 973     } else {
 974         retval = g_strdup(qstring_get_str(qstring));
 975     }
 976
 977     QDECREF(qstring);
 978     return retval;
 979 }
 980
 981 void object_property_set_link(Object *obj, Object *value,
 982                               const char *name, Error **errp)
 983 {
 984     if (value) {
 985         gchar *path = object_get_canonical_path(value);
 986         object_property_set_str(obj, path, name, errp);
 987         g_free(path);
 988     } else {
 989         object_property_set_str(obj, "", name, errp);
 990     }
 991 }
 992
 993 Object *object_property_get_link(Object *obj, const char *name,
 994                                  Error **errp)
 995 {
 996     char *str = object_property_get_str(obj, name, errp);
 997     Object *target = NULL;
 998
 999     if (str && *str) {
1000         target = object_resolve_path(str, NULL);
1001         if (!target) {
1002             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1003                       "Device '%s' not found", str);
1004         }
1005     }
1006
1007     g_free(str);
1008     return target;
1009 }
1010
1011 void object_property_set_bool(Object *obj, bool value,
1012                               const char *name, Error **errp)
1013 {
1014     QBool *qbool = qbool_from_bool(value);
1015     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1016
1017     QDECREF(qbool);
1018 }
1019
1020 bool object_property_get_bool(Object *obj, const char *name,
1021                               Error **errp)
1022 {
1023     QObject *ret = object_property_get_qobject(obj, name, errp);
1024     QBool *qbool;
1025     bool retval;
1026
1027     if (!ret) {
1028         return false;
1029     }
1030     qbool = qobject_to_qbool(ret);
1031     if (!qbool) {
1032         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1033         retval = false;
1034     } else {
1035         retval = qbool_get_bool(qbool);
1036     }
1037
1038     QDECREF(qbool);
1039     return retval;
1040 }
1041
1042 void object_property_set_int(Object *obj, int64_t value,
1043                              const char *name, Error **errp)
1044 {
1045     QInt *qint = qint_from_int(value);
1046     object_property_set_qobject(obj, QOBJECT(qint), name, errp);
1047
1048     QDECREF(qint);
1049 }
1050
1051 int64_t object_property_get_int(Object *obj, const char *name,
1052                                 Error **errp)
1053 {
1054     QObject *ret = object_property_get_qobject(obj, name, errp);
1055     QInt *qint;
1056     int64_t retval;
1057
1058     if (!ret) {
1059         return -1;
1060     }
1061     qint = qobject_to_qint(ret);
1062     if (!qint) {
1063         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1064         retval = -1;
1065     } else {
1066         retval = qint_get_int(qint);
1067     }
1068
1069     QDECREF(qint);
1070     return retval;
1071 }
1072
1073 typedef struct EnumProperty {
1074     const char * const *strings;
1075     int (*get)(Object *, Error **);
1076     void (*set)(Object *, int, Error **);
1077 } EnumProperty;
1078
1079 int object_property_get_enum(Object *obj, const char *name,
1080                              const char *typename, Error **errp)
1081 {
1082     StringOutputVisitor *sov;
1083     StringInputVisitor *siv;
1084     char *str;
1085     int ret;
1086     ObjectProperty *prop = object_property_find(obj, name, errp);
1087     EnumProperty *enumprop;
1088
1089     if (prop == NULL) {
1090         return 0;
1091     }
1092
1093     if (!g_str_equal(prop->type, typename)) {
1094         error_setg(errp, "Property %s on %s is not '%s' enum type",
1095                    name, object_class_get_name(
1096                        object_get_class(obj)), typename);
1097         return 0;
1098     }
1099
1100     enumprop = prop->opaque;
1101
1102     sov = string_output_visitor_new(false);
1103     object_property_get(obj, string_output_get_visitor(sov), name, errp);
1104     str = string_output_get_string(sov);
1105     siv = string_input_visitor_new(str);
1106     string_output_visitor_cleanup(sov);
1107     visit_type_enum(string_input_get_visitor(siv),
1108                     &ret, enumprop->strings, NULL, name, errp);
1109
1110     g_free(str);
1111     string_input_visitor_cleanup(siv);
1112
1113     return ret;
1114 }
1115
1116 void object_property_get_uint16List(Object *obj, const char *name,
1117                                     uint16List **list, Error **errp)
1118 {
1119     StringOutputVisitor *ov;
1120     StringInputVisitor *iv;
1121     char *str;
1122
1123     ov = string_output_visitor_new(false);
1124     object_property_get(obj, string_output_get_visitor(ov),
1125                         name, errp);
1126     str = string_output_get_string(ov);
1127     iv = string_input_visitor_new(str);
1128     visit_type_uint16List(string_input_get_visitor(iv),
1129                           list, NULL, errp);
1130
1131     g_free(str);
1132     string_output_visitor_cleanup(ov);
1133     string_input_visitor_cleanup(iv);
1134 }
1135
1136 void object_property_parse(Object *obj, const char *string,
1137                            const char *name, Error **errp)
1138 {
1139     StringInputVisitor *mi;
1140     mi = string_input_visitor_new(string);
1141     object_property_set(obj, string_input_get_visitor(mi), name, errp);
1142
1143     string_input_visitor_cleanup(mi);
1144 }
1145
1146 char *object_property_print(Object *obj, const char *name, bool human,
1147                             Error **errp)
1148 {
1149     StringOutputVisitor *mo;
1150     char *string = NULL;
1151     Error *local_err = NULL;
1152
1153     mo = string_output_visitor_new(human);
1154     object_property_get(obj, string_output_get_visitor(mo), name, &local_err);
1155     if (local_err) {
1156         error_propagate(errp, local_err);
1157         goto out;
1158     }
1159
1160     string = string_output_get_string(mo);
1161
1162 out:
1163     string_output_visitor_cleanup(mo);
1164     return string;
1165 }
1166
1167 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1168 {
1169     ObjectProperty *prop = object_property_find(obj, name, errp);
1170     if (prop == NULL) {
1171         return NULL;
1172     }
1173
1174     return prop->type;
1175 }
1176
1177 Object *object_get_root(void)
1178 {
1179     static Object *root;
1180
1181     if (!root) {
1182         root = object_new("container");
1183     }
1184
1185     return root;
1186 }
1187
1188 Object *object_get_objects_root(void)
1189 {
1190     return container_get(object_get_root(), "/objects");
1191 }
1192
1193 static void object_get_child_property(Object *obj, Visitor *v, void *opaque,
1194                                       const char *name, Error **errp)
1195 {
1196     Object *child = opaque;
1197     gchar *path;
1198
1199     path = object_get_canonical_path(child);
1200     visit_type_str(v, &path, name, errp);
1201     g_free(path);
1202 }
1203
1204 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1205 {
1206     return opaque;
1207 }
1208
1209 static void object_finalize_child_property(Object *obj, const char *name,
1210                                            void *opaque)
1211 {
1212     Object *child = opaque;
1213
1214     if (child->class->unparent) {
1215         (child->class->unparent)(child);
1216     }
1217     child->parent = NULL;
1218     object_unref(child);
1219 }
1220
1221 void object_property_add_child(Object *obj, const char *name,
1222                                Object *child, Error **errp)
1223 {
1224     Error *local_err = NULL;
1225     gchar *type;
1226     ObjectProperty *op;
1227
1228     if (child->parent != NULL) {
1229         error_setg(errp, "child object is already parented");
1230         return;
1231     }
1232
1233     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1234
1235     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1236                              object_finalize_child_property, child, &local_err);
1237     if (local_err) {
1238         error_propagate(errp, local_err);
1239         goto out;
1240     }
1241
1242     op->resolve = object_resolve_child_property;
1243     object_ref(child);
1244     child->parent = obj;
1245
1246 out:
1247     g_free(type);
1248 }
1249
1250 void object_property_allow_set_link(Object *obj, const char *name,
1251                                     Object *val, Error **errp)
1252 {
1253     /* Allow the link to be set, always */
1254 }
1255
1256 typedef struct {
1257     Object **child;
1258     void (*check)(Object *, const char *, Object *, Error **);
1259     ObjectPropertyLinkFlags flags;
1260 } LinkProperty;
1261
1262 static void object_get_link_property(Object *obj, Visitor *v, void *opaque,
1263                                      const char *name, Error **errp)
1264 {
1265     LinkProperty *lprop = opaque;
1266     Object **child = lprop->child;
1267     gchar *path;
1268
1269     if (*child) {
1270         path = object_get_canonical_path(*child);
1271         visit_type_str(v, &path, name, errp);
1272         g_free(path);
1273     } else {
1274         path = (gchar *)"";
1275         visit_type_str(v, &path, name, errp);
1276     }
1277 }
1278
1279 /*
1280  * object_resolve_link:
1281  *
1282  * Lookup an object and ensure its type matches the link property type.  This
1283  * is similar to object_resolve_path() except type verification against the
1284  * link property is performed.
1285  *
1286  * Returns: The matched object or NULL on path lookup failures.
1287  */
1288 static Object *object_resolve_link(Object *obj, const char *name,
1289                                    const char *path, Error **errp)
1290 {
1291     const char *type;
1292     gchar *target_type;
1293     bool ambiguous = false;
1294     Object *target;
1295
1296     /* Go from link<FOO> to FOO.  */
1297     type = object_property_get_type(obj, name, NULL);
1298     target_type = g_strndup(&type[5], strlen(type) - 6);
1299     target = object_resolve_path_type(path, target_type, &ambiguous);
1300
1301     if (ambiguous) {
1302         error_set(errp, ERROR_CLASS_GENERIC_ERROR,
1303                   "Path '%s' does not uniquely identify an object", path);
1304     } else if (!target) {
1305         target = object_resolve_path(path, &ambiguous);
1306         if (target || ambiguous) {
1307             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1308         } else {
1309             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1310                       "Device '%s' not found", path);
1311         }
1312         target = NULL;
1313     }
1314     g_free(target_type);
1315
1316     return target;
1317 }
1318
1319 static void object_set_link_property(Object *obj, Visitor *v, void *opaque,
1320                                      const char *name, Error **errp)
1321 {
1322     Error *local_err = NULL;
1323     LinkProperty *prop = opaque;
1324     Object **child = prop->child;
1325     Object *old_target = *child;
1326     Object *new_target = NULL;
1327     char *path = NULL;
1328
1329     visit_type_str(v, &path, name, &local_err);
1330
1331     if (!local_err && strcmp(path, "") != 0) {
1332         new_target = object_resolve_link(obj, name, path, &local_err);
1333     }
1334
1335     g_free(path);
1336     if (local_err) {
1337         error_propagate(errp, local_err);
1338         return;
1339     }
1340
1341     prop->check(obj, name, new_target, &local_err);
1342     if (local_err) {
1343         error_propagate(errp, local_err);
1344         return;
1345     }
1346
1347     object_ref(new_target);
1348     *child = new_target;
1349     object_unref(old_target);
1350 }
1351
1352 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1353 {
1354     LinkProperty *lprop = opaque;
1355
1356     return *lprop->child;
1357 }
1358
1359 static void object_release_link_property(Object *obj, const char *name,
1360                                          void *opaque)
1361 {
1362     LinkProperty *prop = opaque;
1363
1364     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1365         object_unref(*prop->child);
1366     }
1367     g_free(prop);
1368 }
1369
1370 void object_property_add_link(Object *obj, const char *name,
1371                               const char *type, Object **child,
1372                               void (*check)(Object *, const char *,
1373                                             Object *, Error **),
1374                               ObjectPropertyLinkFlags flags,
1375                               Error **errp)
1376 {
1377     Error *local_err = NULL;
1378     LinkProperty *prop = g_malloc(sizeof(*prop));
1379     gchar *full_type;
1380     ObjectProperty *op;
1381
1382     prop->child = child;
1383     prop->check = check;
1384     prop->flags = flags;
1385
1386     full_type = g_strdup_printf("link<%s>", type);
1387
1388     op = object_property_add(obj, name, full_type,
1389                              object_get_link_property,
1390                              check ? object_set_link_property : NULL,
1391                              object_release_link_property,
1392                              prop,
1393                              &local_err);
1394     if (local_err) {
1395         error_propagate(errp, local_err);
1396         g_free(prop);
1397         goto out;
1398     }
1399
1400     op->resolve = object_resolve_link_property;
1401
1402 out:
1403     g_free(full_type);
1404 }
1405
1406 void object_property_add_const_link(Object *obj, const char *name,
1407                                     Object *target, Error **errp)
1408 {
1409     char *link_type;
1410     ObjectProperty *op;
1411
1412     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1413     op = object_property_add(obj, name, link_type,
1414                              object_get_child_property, NULL,
1415                              NULL, target, errp);
1416     if (op != NULL) {
1417         op->resolve = object_resolve_child_property;
1418     }
1419     g_free(link_type);
1420 }
1421
1422 gchar *object_get_canonical_path_component(Object *obj)
1423 {
1424     ObjectProperty *prop = NULL;
1425
1426     g_assert(obj);
1427     g_assert(obj->parent != NULL);
1428
1429     QTAILQ_FOREACH(prop, &obj->parent->properties, node) {
1430         if (!object_property_is_child(prop)) {
1431             continue;
1432         }
1433
1434         if (prop->opaque == obj) {
1435             return g_strdup(prop->name);
1436         }
1437     }
1438
1439     /* obj had a parent but was not a child, should never happen */
1440     g_assert_not_reached();
1441     return NULL;
1442 }
1443
1444 gchar *object_get_canonical_path(Object *obj)
1445 {
1446     Object *root = object_get_root();
1447     char *newpath, *path = NULL;
1448
1449     while (obj != root) {
1450         char *component = object_get_canonical_path_component(obj);
1451
1452         if (path) {
1453             newpath = g_strdup_printf("%s/%s", component, path);
1454             g_free(component);
1455             g_free(path);
1456             path = newpath;
1457         } else {
1458             path = component;
1459         }
1460
1461         obj = obj->parent;
1462     }
1463
1464     newpath = g_strdup_printf("/%s", path ? path : "");
1465     g_free(path);
1466
1467     return newpath;
1468 }
1469
1470 Object *object_resolve_path_component(Object *parent, const gchar *part)
1471 {
1472     ObjectProperty *prop = object_property_find(parent, part, NULL);
1473     if (prop == NULL) {
1474         return NULL;
1475     }
1476
1477     if (prop->resolve) {
1478         return prop->resolve(parent, prop->opaque, part);
1479     } else {
1480         return NULL;
1481     }
1482 }
1483
1484 static Object *object_resolve_abs_path(Object *parent,
1485                                           gchar **parts,
1486                                           const char *typename,
1487                                           int index)
1488 {
1489     Object *child;
1490
1491     if (parts[index] == NULL) {
1492         return object_dynamic_cast(parent, typename);
1493     }
1494
1495     if (strcmp(parts[index], "") == 0) {
1496         return object_resolve_abs_path(parent, parts, typename, index + 1);
1497     }
1498
1499     child = object_resolve_path_component(parent, parts[index]);
1500     if (!child) {
1501         return NULL;
1502     }
1503
1504     return object_resolve_abs_path(child, parts, typename, index + 1);
1505 }
1506
1507 static Object *object_resolve_partial_path(Object *parent,
1508                                               gchar **parts,
1509                                               const char *typename,
1510                                               bool *ambiguous)
1511 {
1512     Object *obj;
1513     ObjectProperty *prop;
1514
1515     obj = object_resolve_abs_path(parent, parts, typename, 0);
1516
1517     QTAILQ_FOREACH(prop, &parent->properties, node) {
1518         Object *found;
1519
1520         if (!object_property_is_child(prop)) {
1521             continue;
1522         }
1523
1524         found = object_resolve_partial_path(prop->opaque, parts,
1525                                             typename, ambiguous);
1526         if (found) {
1527             if (obj) {
1528                 if (ambiguous) {
1529                     *ambiguous = true;
1530                 }
1531                 return NULL;
1532             }
1533             obj = found;
1534         }
1535
1536         if (ambiguous && *ambiguous) {
1537             return NULL;
1538         }
1539     }
1540
1541     return obj;
1542 }
1543
1544 Object *object_resolve_path_type(const char *path, const char *typename,
1545                                  bool *ambiguous)
1546 {
1547     Object *obj;
1548     gchar **parts;
1549
1550     parts = g_strsplit(path, "/", 0);
1551     assert(parts);
1552
1553     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1554         if (ambiguous) {
1555             *ambiguous = false;
1556         }
1557         obj = object_resolve_partial_path(object_get_root(), parts,
1558                                           typename, ambiguous);
1559     } else {
1560         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1561     }
1562
1563     g_strfreev(parts);
1564
1565     return obj;
1566 }
1567
1568 Object *object_resolve_path(const char *path, bool *ambiguous)
1569 {
1570     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1571 }
1572
1573 typedef struct StringProperty
1574 {
1575     char *(*get)(Object *, Error **);
1576     void (*set)(Object *, const char *, Error **);
1577 } StringProperty;
1578
1579 static void property_get_str(Object *obj, Visitor *v, void *opaque,
1580                              const char *name, Error **errp)
1581 {
1582     StringProperty *prop = opaque;
1583     char *value;
1584
1585     value = prop->get(obj, errp);
1586     if (value) {
1587         visit_type_str(v, &value, name, errp);
1588         g_free(value);
1589     }
1590 }
1591
1592 static void property_set_str(Object *obj, Visitor *v, void *opaque,
1593                              const char *name, Error **errp)
1594 {
1595     StringProperty *prop = opaque;
1596     char *value;
1597     Error *local_err = NULL;
1598
1599     visit_type_str(v, &value, name, &local_err);
1600     if (local_err) {
1601         error_propagate(errp, local_err);
1602         return;
1603     }
1604
1605     prop->set(obj, value, errp);
1606     g_free(value);
1607 }
1608
1609 static void property_release_str(Object *obj, const char *name,
1610                                  void *opaque)
1611 {
1612     StringProperty *prop = opaque;
1613     g_free(prop);
1614 }
1615
1616 void object_property_add_str(Object *obj, const char *name,
1617                            char *(*get)(Object *, Error **),
1618                            void (*set)(Object *, const char *, Error **),
1619                            Error **errp)
1620 {
1621     Error *local_err = NULL;
1622     StringProperty *prop = g_malloc0(sizeof(*prop));
1623
1624     prop->get = get;
1625     prop->set = set;
1626
1627     object_property_add(obj, name, "string",
1628                         get ? property_get_str : NULL,
1629                         set ? property_set_str : NULL,
1630                         property_release_str,
1631                         prop, &local_err);
1632     if (local_err) {
1633         error_propagate(errp, local_err);
1634         g_free(prop);
1635     }
1636 }
1637
1638 typedef struct BoolProperty
1639 {
1640     bool (*get)(Object *, Error **);
1641     void (*set)(Object *, bool, Error **);
1642 } BoolProperty;
1643
1644 static void property_get_bool(Object *obj, Visitor *v, void *opaque,
1645                               const char *name, Error **errp)
1646 {
1647     BoolProperty *prop = opaque;
1648     bool value;
1649
1650     value = prop->get(obj, errp);
1651     visit_type_bool(v, &value, name, errp);
1652 }
1653
1654 static void property_set_bool(Object *obj, Visitor *v, void *opaque,
1655                               const char *name, Error **errp)
1656 {
1657     BoolProperty *prop = opaque;
1658     bool value;
1659     Error *local_err = NULL;
1660
1661     visit_type_bool(v, &value, name, &local_err);
1662     if (local_err) {
1663         error_propagate(errp, local_err);
1664         return;
1665     }
1666
1667     prop->set(obj, value, errp);
1668 }
1669
1670 static void property_release_bool(Object *obj, const char *name,
1671                                   void *opaque)
1672 {
1673     BoolProperty *prop = opaque;
1674     g_free(prop);
1675 }
1676
1677 void object_property_add_bool(Object *obj, const char *name,
1678                               bool (*get)(Object *, Error **),
1679                               void (*set)(Object *, bool, Error **),
1680                               Error **errp)
1681 {
1682     Error *local_err = NULL;
1683     BoolProperty *prop = g_malloc0(sizeof(*prop));
1684
1685     prop->get = get;
1686     prop->set = set;
1687
1688     object_property_add(obj, name, "bool",
1689                         get ? property_get_bool : NULL,
1690                         set ? property_set_bool : NULL,
1691                         property_release_bool,
1692                         prop, &local_err);
1693     if (local_err) {
1694         error_propagate(errp, local_err);
1695         g_free(prop);
1696     }
1697 }
1698
1699 static void property_get_enum(Object *obj, Visitor *v, void *opaque,
1700                               const char *name, Error **errp)
1701 {
1702     EnumProperty *prop = opaque;
1703     int value;
1704
1705     value = prop->get(obj, errp);
1706     visit_type_enum(v, &value, prop->strings, NULL, name, errp);
1707 }
1708
1709 static void property_set_enum(Object *obj, Visitor *v, void *opaque,
1710                               const char *name, Error **errp)
1711 {
1712     EnumProperty *prop = opaque;
1713     int value;
1714
1715     visit_type_enum(v, &value, prop->strings, NULL, name, errp);
1716     prop->set(obj, value, errp);
1717 }
1718
1719 static void property_release_enum(Object *obj, const char *name,
1720                                   void *opaque)
1721 {
1722     EnumProperty *prop = opaque;
1723     g_free(prop);
1724 }
1725
1726 void object_property_add_enum(Object *obj, const char *name,
1727                               const char *typename,
1728                               const char * const *strings,
1729                               int (*get)(Object *, Error **),
1730                               void (*set)(Object *, int, Error **),
1731                               Error **errp)
1732 {
1733     Error *local_err = NULL;
1734     EnumProperty *prop = g_malloc(sizeof(*prop));
1735
1736     prop->strings = strings;
1737     prop->get = get;
1738     prop->set = set;
1739
1740     object_property_add(obj, name, typename,
1741                         get ? property_get_enum : NULL,
1742                         set ? property_set_enum : NULL,
1743                         property_release_enum,
1744                         prop, &local_err);
1745     if (local_err) {
1746         error_propagate(errp, local_err);
1747         g_free(prop);
1748     }
1749 }
1750
1751 typedef struct TMProperty {
1752     void (*get)(Object *, struct tm *, Error **);
1753 } TMProperty;
1754
1755 static void property_get_tm(Object *obj, Visitor *v, void *opaque,
1756                             const char *name, Error **errp)
1757 {
1758     TMProperty *prop = opaque;
1759     Error *err = NULL;
1760     struct tm value;
1761
1762     prop->get(obj, &value, &err);
1763     if (err) {
1764         goto out;
1765     }
1766
1767     visit_start_struct(v, NULL, "struct tm", name, 0, &err);
1768     if (err) {
1769         goto out;
1770     }
1771     visit_type_int32(v, &value.tm_year, "tm_year", &err);
1772     if (err) {
1773         goto out_end;
1774     }
1775     visit_type_int32(v, &value.tm_mon, "tm_mon", &err);
1776     if (err) {
1777         goto out_end;
1778     }
1779     visit_type_int32(v, &value.tm_mday, "tm_mday", &err);
1780     if (err) {
1781         goto out_end;
1782     }
1783     visit_type_int32(v, &value.tm_hour, "tm_hour", &err);
1784     if (err) {
1785         goto out_end;
1786     }
1787     visit_type_int32(v, &value.tm_min, "tm_min", &err);
1788     if (err) {
1789         goto out_end;
1790     }
1791     visit_type_int32(v, &value.tm_sec, "tm_sec", &err);
1792     if (err) {
1793         goto out_end;
1794     }
1795 out_end:
1796     error_propagate(errp, err);
1797     err = NULL;
1798     visit_end_struct(v, errp);
1799 out:
1800     error_propagate(errp, err);
1801
1802 }
1803
1804 static void property_release_tm(Object *obj, const char *name,
1805                                 void *opaque)
1806 {
1807     TMProperty *prop = opaque;
1808     g_free(prop);
1809 }
1810
1811 void object_property_add_tm(Object *obj, const char *name,
1812                             void (*get)(Object *, struct tm *, Error **),
1813                             Error **errp)
1814 {
1815     Error *local_err = NULL;
1816     TMProperty *prop = g_malloc0(sizeof(*prop));
1817
1818     prop->get = get;
1819
1820     object_property_add(obj, name, "struct tm",
1821                         get ? property_get_tm : NULL, NULL,
1822                         property_release_tm,
1823                         prop, &local_err);
1824     if (local_err) {
1825         error_propagate(errp, local_err);
1826         g_free(prop);
1827     }
1828 }
1829
1830 static char *qdev_get_type(Object *obj, Error **errp)
1831 {
1832     return g_strdup(object_get_typename(obj));
1833 }
1834
1835 static void property_get_uint8_ptr(Object *obj, Visitor *v,
1836                                    void *opaque, const char *name,
1837                                    Error **errp)
1838 {
1839     uint8_t value = *(uint8_t *)opaque;
1840     visit_type_uint8(v, &value, name, errp);
1841 }
1842
1843 static void property_get_uint16_ptr(Object *obj, Visitor *v,
1844                                    void *opaque, const char *name,
1845                                    Error **errp)
1846 {
1847     uint16_t value = *(uint16_t *)opaque;
1848     visit_type_uint16(v, &value, name, errp);
1849 }
1850
1851 static void property_get_uint32_ptr(Object *obj, Visitor *v,
1852                                    void *opaque, const char *name,
1853                                    Error **errp)
1854 {
1855     uint32_t value = *(uint32_t *)opaque;
1856     visit_type_uint32(v, &value, name, errp);
1857 }
1858
1859 static void property_get_uint64_ptr(Object *obj, Visitor *v,
1860                                    void *opaque, const char *name,
1861                                    Error **errp)
1862 {
1863     uint64_t value = *(uint64_t *)opaque;
1864     visit_type_uint64(v, &value, name, errp);
1865 }
1866
1867 void object_property_add_uint8_ptr(Object *obj, const char *name,
1868                                    const uint8_t *v, Error **errp)
1869 {
1870     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
1871                         NULL, NULL, (void *)v, errp);
1872 }
1873
1874 void object_property_add_uint16_ptr(Object *obj, const char *name,
1875                                     const uint16_t *v, Error **errp)
1876 {
1877     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
1878                         NULL, NULL, (void *)v, errp);
1879 }
1880
1881 void object_property_add_uint32_ptr(Object *obj, const char *name,
1882                                     const uint32_t *v, Error **errp)
1883 {
1884     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
1885                         NULL, NULL, (void *)v, errp);
1886 }
1887
1888 void object_property_add_uint64_ptr(Object *obj, const char *name,
1889                                     const uint64_t *v, Error **errp)
1890 {
1891     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
1892                         NULL, NULL, (void *)v, errp);
1893 }
1894
1895 typedef struct {
1896     Object *target_obj;
1897     char *target_name;
1898 } AliasProperty;
1899
1900 static void property_get_alias(Object *obj, struct Visitor *v, void *opaque,
1901                                const char *name, Error **errp)
1902 {
1903     AliasProperty *prop = opaque;
1904
1905     object_property_get(prop->target_obj, v, prop->target_name, errp);
1906 }
1907
1908 static void property_set_alias(Object *obj, struct Visitor *v, void *opaque,
1909                                const char *name, Error **errp)
1910 {
1911     AliasProperty *prop = opaque;
1912
1913     object_property_set(prop->target_obj, v, prop->target_name, errp);
1914 }
1915
1916 static Object *property_resolve_alias(Object *obj, void *opaque,
1917                                       const gchar *part)
1918 {
1919     AliasProperty *prop = opaque;
1920
1921     return object_resolve_path_component(prop->target_obj, prop->target_name);
1922 }
1923
1924 static void property_release_alias(Object *obj, const char *name, void *opaque)
1925 {
1926     AliasProperty *prop = opaque;
1927
1928     g_free(prop->target_name);
1929     g_free(prop);
1930 }
1931
1932 void object_property_add_alias(Object *obj, const char *name,
1933                                Object *target_obj, const char *target_name,
1934                                Error **errp)
1935 {
1936     AliasProperty *prop;
1937     ObjectProperty *op;
1938     ObjectProperty *target_prop;
1939     gchar *prop_type;
1940     Error *local_err = NULL;
1941
1942     target_prop = object_property_find(target_obj, target_name, errp);
1943     if (!target_prop) {
1944         return;
1945     }
1946
1947     if (object_property_is_child(target_prop)) {
1948         prop_type = g_strdup_printf("link%s",
1949                                     target_prop->type + strlen("child"));
1950     } else {
1951         prop_type = g_strdup(target_prop->type);
1952     }
1953
1954     prop = g_malloc(sizeof(*prop));
1955     prop->target_obj = target_obj;
1956     prop->target_name = g_strdup(target_name);
1957
1958     op = object_property_add(obj, name, prop_type,
1959                              property_get_alias,
1960                              property_set_alias,
1961                              property_release_alias,
1962                              prop, &local_err);
1963     if (local_err) {
1964         error_propagate(errp, local_err);
1965         g_free(prop);
1966         goto out;
1967     }
1968     op->resolve = property_resolve_alias;
1969
1970     object_property_set_description(obj, op->name,
1971                                     target_prop->description,
1972                                     &error_abort);
1973
1974 out:
1975     g_free(prop_type);
1976 }
1977
1978 void object_property_set_description(Object *obj, const char *name,
1979                                      const char *description, Error **errp)
1980 {
1981     ObjectProperty *op;
1982
1983     op = object_property_find(obj, name, errp);
1984     if (!op) {
1985         return;
1986     }
1987
1988     g_free(op->description);
1989     op->description = g_strdup(description);
1990 }
1991
1992 static void object_instance_init(Object *obj)
1993 {
1994     object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
1995 }
1996
1997 static void register_types(void)
1998 {
1999     static TypeInfo interface_info = {
2000         .name = TYPE_INTERFACE,
2001         .class_size = sizeof(InterfaceClass),
2002         .abstract = true,
2003     };
2004
2005     static TypeInfo object_info = {
2006         .name = TYPE_OBJECT,
2007         .instance_size = sizeof(Object),
2008         .instance_init = object_instance_init,
2009         .abstract = true,
2010     };
2011
2012     type_interface = type_register_internal(&interface_info);
2013     type_register_internal(&object_info);
2014 }
2015
2016 type_init(register_types)