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_set(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_set(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_set(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, QERR_DEVICE_NOT_FOUND, str);
1003         }
1004     }
1005
1006     g_free(str);
1007     return target;
1008 }
1009
1010 void object_property_set_bool(Object *obj, bool value,
1011                               const char *name, Error **errp)
1012 {
1013     QBool *qbool = qbool_from_int(value);
1014     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1015
1016     QDECREF(qbool);
1017 }
1018
1019 bool object_property_get_bool(Object *obj, const char *name,
1020                               Error **errp)
1021 {
1022     QObject *ret = object_property_get_qobject(obj, name, errp);
1023     QBool *qbool;
1024     bool retval;
1025
1026     if (!ret) {
1027         return false;
1028     }
1029     qbool = qobject_to_qbool(ret);
1030     if (!qbool) {
1031         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1032         retval = false;
1033     } else {
1034         retval = qbool_get_int(qbool);
1035     }
1036
1037     QDECREF(qbool);
1038     return retval;
1039 }
1040
1041 void object_property_set_int(Object *obj, int64_t value,
1042                              const char *name, Error **errp)
1043 {
1044     QInt *qint = qint_from_int(value);
1045     object_property_set_qobject(obj, QOBJECT(qint), name, errp);
1046
1047     QDECREF(qint);
1048 }
1049
1050 int64_t object_property_get_int(Object *obj, const char *name,
1051                                 Error **errp)
1052 {
1053     QObject *ret = object_property_get_qobject(obj, name, errp);
1054     QInt *qint;
1055     int64_t retval;
1056
1057     if (!ret) {
1058         return -1;
1059     }
1060     qint = qobject_to_qint(ret);
1061     if (!qint) {
1062         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1063         retval = -1;
1064     } else {
1065         retval = qint_get_int(qint);
1066     }
1067
1068     QDECREF(qint);
1069     return retval;
1070 }
1071
1072 typedef struct EnumProperty {
1073     const char * const *strings;
1074     int (*get)(Object *, Error **);
1075     void (*set)(Object *, int, Error **);
1076 } EnumProperty;
1077
1078 int object_property_get_enum(Object *obj, const char *name,
1079                              const char * const strings[], Error **errp)
1080 {
1081     StringOutputVisitor *sov;
1082     StringInputVisitor *siv;
1083     char *str;
1084     int ret;
1085
1086     sov = string_output_visitor_new(false);
1087     object_property_get(obj, string_output_get_visitor(sov), name, errp);
1088     str = string_output_get_string(sov);
1089     siv = string_input_visitor_new(str);
1090     string_output_visitor_cleanup(sov);
1091     visit_type_enum(string_input_get_visitor(siv),
1092                     &ret, strings, NULL, name, errp);
1093
1094     g_free(str);
1095     string_input_visitor_cleanup(siv);
1096
1097     return ret;
1098 }
1099
1100 void object_property_get_uint16List(Object *obj, const char *name,
1101                                     uint16List **list, Error **errp)
1102 {
1103     StringOutputVisitor *ov;
1104     StringInputVisitor *iv;
1105     char *str;
1106
1107     ov = string_output_visitor_new(false);
1108     object_property_get(obj, string_output_get_visitor(ov),
1109                         name, errp);
1110     str = string_output_get_string(ov);
1111     iv = string_input_visitor_new(str);
1112     visit_type_uint16List(string_input_get_visitor(iv),
1113                           list, NULL, errp);
1114
1115     g_free(str);
1116     string_output_visitor_cleanup(ov);
1117     string_input_visitor_cleanup(iv);
1118 }
1119
1120 void object_property_parse(Object *obj, const char *string,
1121                            const char *name, Error **errp)
1122 {
1123     StringInputVisitor *mi;
1124     mi = string_input_visitor_new(string);
1125     object_property_set(obj, string_input_get_visitor(mi), name, errp);
1126
1127     string_input_visitor_cleanup(mi);
1128 }
1129
1130 char *object_property_print(Object *obj, const char *name, bool human,
1131                             Error **errp)
1132 {
1133     StringOutputVisitor *mo;
1134     char *string = NULL;
1135     Error *local_err = NULL;
1136
1137     mo = string_output_visitor_new(human);
1138     object_property_get(obj, string_output_get_visitor(mo), name, &local_err);
1139     if (local_err) {
1140         error_propagate(errp, local_err);
1141         goto out;
1142     }
1143
1144     string = string_output_get_string(mo);
1145
1146 out:
1147     string_output_visitor_cleanup(mo);
1148     return string;
1149 }
1150
1151 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1152 {
1153     ObjectProperty *prop = object_property_find(obj, name, errp);
1154     if (prop == NULL) {
1155         return NULL;
1156     }
1157
1158     return prop->type;
1159 }
1160
1161 Object *object_get_root(void)
1162 {
1163     static Object *root;
1164
1165     if (!root) {
1166         root = object_new("container");
1167     }
1168
1169     return root;
1170 }
1171
1172 Object *object_get_objects_root(void)
1173 {
1174     return container_get(object_get_root(), "/objects");
1175 }
1176
1177 static void object_get_child_property(Object *obj, Visitor *v, void *opaque,
1178                                       const char *name, Error **errp)
1179 {
1180     Object *child = opaque;
1181     gchar *path;
1182
1183     path = object_get_canonical_path(child);
1184     visit_type_str(v, &path, name, errp);
1185     g_free(path);
1186 }
1187
1188 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1189 {
1190     return opaque;
1191 }
1192
1193 static void object_finalize_child_property(Object *obj, const char *name,
1194                                            void *opaque)
1195 {
1196     Object *child = opaque;
1197
1198     if (child->class->unparent) {
1199         (child->class->unparent)(child);
1200     }
1201     child->parent = NULL;
1202     object_unref(child);
1203 }
1204
1205 void object_property_add_child(Object *obj, const char *name,
1206                                Object *child, Error **errp)
1207 {
1208     Error *local_err = NULL;
1209     gchar *type;
1210     ObjectProperty *op;
1211
1212     if (child->parent != NULL) {
1213         error_setg(errp, "child object is already parented");
1214         return;
1215     }
1216
1217     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1218
1219     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1220                              object_finalize_child_property, child, &local_err);
1221     if (local_err) {
1222         error_propagate(errp, local_err);
1223         goto out;
1224     }
1225
1226     op->resolve = object_resolve_child_property;
1227     object_ref(child);
1228     child->parent = obj;
1229
1230 out:
1231     g_free(type);
1232 }
1233
1234 void object_property_allow_set_link(Object *obj, const char *name,
1235                                     Object *val, Error **errp)
1236 {
1237     /* Allow the link to be set, always */
1238 }
1239
1240 typedef struct {
1241     Object **child;
1242     void (*check)(Object *, const char *, Object *, Error **);
1243     ObjectPropertyLinkFlags flags;
1244 } LinkProperty;
1245
1246 static void object_get_link_property(Object *obj, Visitor *v, void *opaque,
1247                                      const char *name, Error **errp)
1248 {
1249     LinkProperty *lprop = opaque;
1250     Object **child = lprop->child;
1251     gchar *path;
1252
1253     if (*child) {
1254         path = object_get_canonical_path(*child);
1255         visit_type_str(v, &path, name, errp);
1256         g_free(path);
1257     } else {
1258         path = (gchar *)"";
1259         visit_type_str(v, &path, name, errp);
1260     }
1261 }
1262
1263 /*
1264  * object_resolve_link:
1265  *
1266  * Lookup an object and ensure its type matches the link property type.  This
1267  * is similar to object_resolve_path() except type verification against the
1268  * link property is performed.
1269  *
1270  * Returns: The matched object or NULL on path lookup failures.
1271  */
1272 static Object *object_resolve_link(Object *obj, const char *name,
1273                                    const char *path, Error **errp)
1274 {
1275     const char *type;
1276     gchar *target_type;
1277     bool ambiguous = false;
1278     Object *target;
1279
1280     /* Go from link<FOO> to FOO.  */
1281     type = object_property_get_type(obj, name, NULL);
1282     target_type = g_strndup(&type[5], strlen(type) - 6);
1283     target = object_resolve_path_type(path, target_type, &ambiguous);
1284
1285     if (ambiguous) {
1286         error_set(errp, ERROR_CLASS_GENERIC_ERROR,
1287                   "Path '%s' does not uniquely identify an object", path);
1288     } else if (!target) {
1289         target = object_resolve_path(path, &ambiguous);
1290         if (target || ambiguous) {
1291             error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1292         } else {
1293             error_set(errp, QERR_DEVICE_NOT_FOUND, path);
1294         }
1295         target = NULL;
1296     }
1297     g_free(target_type);
1298
1299     return target;
1300 }
1301
1302 static void object_set_link_property(Object *obj, Visitor *v, void *opaque,
1303                                      const char *name, Error **errp)
1304 {
1305     Error *local_err = NULL;
1306     LinkProperty *prop = opaque;
1307     Object **child = prop->child;
1308     Object *old_target = *child;
1309     Object *new_target = NULL;
1310     char *path = NULL;
1311
1312     visit_type_str(v, &path, name, &local_err);
1313
1314     if (!local_err && strcmp(path, "") != 0) {
1315         new_target = object_resolve_link(obj, name, path, &local_err);
1316     }
1317
1318     g_free(path);
1319     if (local_err) {
1320         error_propagate(errp, local_err);
1321         return;
1322     }
1323
1324     prop->check(obj, name, new_target, &local_err);
1325     if (local_err) {
1326         error_propagate(errp, local_err);
1327         return;
1328     }
1329
1330     object_ref(new_target);
1331     *child = new_target;
1332     object_unref(old_target);
1333 }
1334
1335 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1336 {
1337     LinkProperty *lprop = opaque;
1338
1339     return *lprop->child;
1340 }
1341
1342 static void object_release_link_property(Object *obj, const char *name,
1343                                          void *opaque)
1344 {
1345     LinkProperty *prop = opaque;
1346
1347     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1348         object_unref(*prop->child);
1349     }
1350     g_free(prop);
1351 }
1352
1353 void object_property_add_link(Object *obj, const char *name,
1354                               const char *type, Object **child,
1355                               void (*check)(Object *, const char *,
1356                                             Object *, Error **),
1357                               ObjectPropertyLinkFlags flags,
1358                               Error **errp)
1359 {
1360     Error *local_err = NULL;
1361     LinkProperty *prop = g_malloc(sizeof(*prop));
1362     gchar *full_type;
1363     ObjectProperty *op;
1364
1365     prop->child = child;
1366     prop->check = check;
1367     prop->flags = flags;
1368
1369     full_type = g_strdup_printf("link<%s>", type);
1370
1371     op = object_property_add(obj, name, full_type,
1372                              object_get_link_property,
1373                              check ? object_set_link_property : NULL,
1374                              object_release_link_property,
1375                              prop,
1376                              &local_err);
1377     if (local_err) {
1378         error_propagate(errp, local_err);
1379         g_free(prop);
1380         goto out;
1381     }
1382
1383     op->resolve = object_resolve_link_property;
1384
1385 out:
1386     g_free(full_type);
1387 }
1388
1389 void object_property_add_const_link(Object *obj, const char *name,
1390                                     Object *target, Error **errp)
1391 {
1392     char *link_type;
1393     ObjectProperty *op;
1394
1395     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1396     op = object_property_add(obj, name, link_type,
1397                              object_get_child_property, NULL,
1398                              NULL, target, errp);
1399     if (op != NULL) {
1400         op->resolve = object_resolve_child_property;
1401     }
1402     g_free(link_type);
1403 }
1404
1405 gchar *object_get_canonical_path_component(Object *obj)
1406 {
1407     ObjectProperty *prop = NULL;
1408
1409     g_assert(obj);
1410     g_assert(obj->parent != NULL);
1411
1412     QTAILQ_FOREACH(prop, &obj->parent->properties, node) {
1413         if (!object_property_is_child(prop)) {
1414             continue;
1415         }
1416
1417         if (prop->opaque == obj) {
1418             return g_strdup(prop->name);
1419         }
1420     }
1421
1422     /* obj had a parent but was not a child, should never happen */
1423     g_assert_not_reached();
1424     return NULL;
1425 }
1426
1427 gchar *object_get_canonical_path(Object *obj)
1428 {
1429     Object *root = object_get_root();
1430     char *newpath, *path = NULL;
1431
1432     while (obj != root) {
1433         char *component = object_get_canonical_path_component(obj);
1434
1435         if (path) {
1436             newpath = g_strdup_printf("%s/%s", component, path);
1437             g_free(component);
1438             g_free(path);
1439             path = newpath;
1440         } else {
1441             path = component;
1442         }
1443
1444         obj = obj->parent;
1445     }
1446
1447     newpath = g_strdup_printf("/%s", path ? path : "");
1448     g_free(path);
1449
1450     return newpath;
1451 }
1452
1453 Object *object_resolve_path_component(Object *parent, const gchar *part)
1454 {
1455     ObjectProperty *prop = object_property_find(parent, part, NULL);
1456     if (prop == NULL) {
1457         return NULL;
1458     }
1459
1460     if (prop->resolve) {
1461         return prop->resolve(parent, prop->opaque, part);
1462     } else {
1463         return NULL;
1464     }
1465 }
1466
1467 static Object *object_resolve_abs_path(Object *parent,
1468                                           gchar **parts,
1469                                           const char *typename,
1470                                           int index)
1471 {
1472     Object *child;
1473
1474     if (parts[index] == NULL) {
1475         return object_dynamic_cast(parent, typename);
1476     }
1477
1478     if (strcmp(parts[index], "") == 0) {
1479         return object_resolve_abs_path(parent, parts, typename, index + 1);
1480     }
1481
1482     child = object_resolve_path_component(parent, parts[index]);
1483     if (!child) {
1484         return NULL;
1485     }
1486
1487     return object_resolve_abs_path(child, parts, typename, index + 1);
1488 }
1489
1490 static Object *object_resolve_partial_path(Object *parent,
1491                                               gchar **parts,
1492                                               const char *typename,
1493                                               bool *ambiguous)
1494 {
1495     Object *obj;
1496     ObjectProperty *prop;
1497
1498     obj = object_resolve_abs_path(parent, parts, typename, 0);
1499
1500     QTAILQ_FOREACH(prop, &parent->properties, node) {
1501         Object *found;
1502
1503         if (!object_property_is_child(prop)) {
1504             continue;
1505         }
1506
1507         found = object_resolve_partial_path(prop->opaque, parts,
1508                                             typename, ambiguous);
1509         if (found) {
1510             if (obj) {
1511                 if (ambiguous) {
1512                     *ambiguous = true;
1513                 }
1514                 return NULL;
1515             }
1516             obj = found;
1517         }
1518
1519         if (ambiguous && *ambiguous) {
1520             return NULL;
1521         }
1522     }
1523
1524     return obj;
1525 }
1526
1527 Object *object_resolve_path_type(const char *path, const char *typename,
1528                                  bool *ambiguous)
1529 {
1530     Object *obj;
1531     gchar **parts;
1532
1533     parts = g_strsplit(path, "/", 0);
1534     assert(parts);
1535
1536     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1537         if (ambiguous) {
1538             *ambiguous = false;
1539         }
1540         obj = object_resolve_partial_path(object_get_root(), parts,
1541                                           typename, ambiguous);
1542     } else {
1543         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1544     }
1545
1546     g_strfreev(parts);
1547
1548     return obj;
1549 }
1550
1551 Object *object_resolve_path(const char *path, bool *ambiguous)
1552 {
1553     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1554 }
1555
1556 typedef struct StringProperty
1557 {
1558     char *(*get)(Object *, Error **);
1559     void (*set)(Object *, const char *, Error **);
1560 } StringProperty;
1561
1562 static void property_get_str(Object *obj, Visitor *v, void *opaque,
1563                              const char *name, Error **errp)
1564 {
1565     StringProperty *prop = opaque;
1566     char *value;
1567
1568     value = prop->get(obj, errp);
1569     if (value) {
1570         visit_type_str(v, &value, name, errp);
1571         g_free(value);
1572     }
1573 }
1574
1575 static void property_set_str(Object *obj, Visitor *v, void *opaque,
1576                              const char *name, Error **errp)
1577 {
1578     StringProperty *prop = opaque;
1579     char *value;
1580     Error *local_err = NULL;
1581
1582     visit_type_str(v, &value, name, &local_err);
1583     if (local_err) {
1584         error_propagate(errp, local_err);
1585         return;
1586     }
1587
1588     prop->set(obj, value, errp);
1589     g_free(value);
1590 }
1591
1592 static void property_release_str(Object *obj, const char *name,
1593                                  void *opaque)
1594 {
1595     StringProperty *prop = opaque;
1596     g_free(prop);
1597 }
1598
1599 void object_property_add_str(Object *obj, const char *name,
1600                            char *(*get)(Object *, Error **),
1601                            void (*set)(Object *, const char *, Error **),
1602                            Error **errp)
1603 {
1604     Error *local_err = NULL;
1605     StringProperty *prop = g_malloc0(sizeof(*prop));
1606
1607     prop->get = get;
1608     prop->set = set;
1609
1610     object_property_add(obj, name, "string",
1611                         get ? property_get_str : NULL,
1612                         set ? property_set_str : NULL,
1613                         property_release_str,
1614                         prop, &local_err);
1615     if (local_err) {
1616         error_propagate(errp, local_err);
1617         g_free(prop);
1618     }
1619 }
1620
1621 typedef struct BoolProperty
1622 {
1623     bool (*get)(Object *, Error **);
1624     void (*set)(Object *, bool, Error **);
1625 } BoolProperty;
1626
1627 static void property_get_bool(Object *obj, Visitor *v, void *opaque,
1628                               const char *name, Error **errp)
1629 {
1630     BoolProperty *prop = opaque;
1631     bool value;
1632
1633     value = prop->get(obj, errp);
1634     visit_type_bool(v, &value, name, errp);
1635 }
1636
1637 static void property_set_bool(Object *obj, Visitor *v, void *opaque,
1638                               const char *name, Error **errp)
1639 {
1640     BoolProperty *prop = opaque;
1641     bool value;
1642     Error *local_err = NULL;
1643
1644     visit_type_bool(v, &value, name, &local_err);
1645     if (local_err) {
1646         error_propagate(errp, local_err);
1647         return;
1648     }
1649
1650     prop->set(obj, value, errp);
1651 }
1652
1653 static void property_release_bool(Object *obj, const char *name,
1654                                   void *opaque)
1655 {
1656     BoolProperty *prop = opaque;
1657     g_free(prop);
1658 }
1659
1660 void object_property_add_bool(Object *obj, const char *name,
1661                               bool (*get)(Object *, Error **),
1662                               void (*set)(Object *, bool, Error **),
1663                               Error **errp)
1664 {
1665     Error *local_err = NULL;
1666     BoolProperty *prop = g_malloc0(sizeof(*prop));
1667
1668     prop->get = get;
1669     prop->set = set;
1670
1671     object_property_add(obj, name, "bool",
1672                         get ? property_get_bool : NULL,
1673                         set ? property_set_bool : NULL,
1674                         property_release_bool,
1675                         prop, &local_err);
1676     if (local_err) {
1677         error_propagate(errp, local_err);
1678         g_free(prop);
1679     }
1680 }
1681
1682 static void property_get_enum(Object *obj, Visitor *v, void *opaque,
1683                               const char *name, Error **errp)
1684 {
1685     EnumProperty *prop = opaque;
1686     int value;
1687
1688     value = prop->get(obj, errp);
1689     visit_type_enum(v, &value, prop->strings, NULL, name, errp);
1690 }
1691
1692 static void property_set_enum(Object *obj, Visitor *v, void *opaque,
1693                               const char *name, Error **errp)
1694 {
1695     EnumProperty *prop = opaque;
1696     int value;
1697
1698     visit_type_enum(v, &value, prop->strings, NULL, name, errp);
1699     prop->set(obj, value, errp);
1700 }
1701
1702 static void property_release_enum(Object *obj, const char *name,
1703                                   void *opaque)
1704 {
1705     EnumProperty *prop = opaque;
1706     g_free(prop);
1707 }
1708
1709 void object_property_add_enum(Object *obj, const char *name,
1710                               const char *typename,
1711                               const char * const *strings,
1712                               int (*get)(Object *, Error **),
1713                               void (*set)(Object *, int, Error **),
1714                               Error **errp)
1715 {
1716     Error *local_err = NULL;
1717     EnumProperty *prop = g_malloc(sizeof(*prop));
1718
1719     prop->strings = strings;
1720     prop->get = get;
1721     prop->set = set;
1722
1723     object_property_add(obj, name, typename,
1724                         get ? property_get_enum : NULL,
1725                         set ? property_set_enum : NULL,
1726                         property_release_enum,
1727                         prop, &local_err);
1728     if (local_err) {
1729         error_propagate(errp, local_err);
1730         g_free(prop);
1731     }
1732 }
1733
1734 typedef struct TMProperty {
1735     void (*get)(Object *, struct tm *, Error **);
1736 } TMProperty;
1737
1738 static void property_get_tm(Object *obj, Visitor *v, void *opaque,
1739                             const char *name, Error **errp)
1740 {
1741     TMProperty *prop = opaque;
1742     Error *err = NULL;
1743     struct tm value;
1744
1745     prop->get(obj, &value, &err);
1746     if (err) {
1747         goto out;
1748     }
1749
1750     visit_start_struct(v, NULL, "struct tm", name, 0, &err);
1751     if (err) {
1752         goto out;
1753     }
1754     visit_type_int32(v, &value.tm_year, "tm_year", &err);
1755     if (err) {
1756         goto out_end;
1757     }
1758     visit_type_int32(v, &value.tm_mon, "tm_mon", &err);
1759     if (err) {
1760         goto out_end;
1761     }
1762     visit_type_int32(v, &value.tm_mday, "tm_mday", &err);
1763     if (err) {
1764         goto out_end;
1765     }
1766     visit_type_int32(v, &value.tm_hour, "tm_hour", &err);
1767     if (err) {
1768         goto out_end;
1769     }
1770     visit_type_int32(v, &value.tm_min, "tm_min", &err);
1771     if (err) {
1772         goto out_end;
1773     }
1774     visit_type_int32(v, &value.tm_sec, "tm_sec", &err);
1775     if (err) {
1776         goto out_end;
1777     }
1778 out_end:
1779     error_propagate(errp, err);
1780     err = NULL;
1781     visit_end_struct(v, errp);
1782 out:
1783     error_propagate(errp, err);
1784
1785 }
1786
1787 static void property_release_tm(Object *obj, const char *name,
1788                                 void *opaque)
1789 {
1790     TMProperty *prop = opaque;
1791     g_free(prop);
1792 }
1793
1794 void object_property_add_tm(Object *obj, const char *name,
1795                             void (*get)(Object *, struct tm *, Error **),
1796                             Error **errp)
1797 {
1798     Error *local_err = NULL;
1799     TMProperty *prop = g_malloc0(sizeof(*prop));
1800
1801     prop->get = get;
1802
1803     object_property_add(obj, name, "struct tm",
1804                         get ? property_get_tm : NULL, NULL,
1805                         property_release_tm,
1806                         prop, &local_err);
1807     if (local_err) {
1808         error_propagate(errp, local_err);
1809         g_free(prop);
1810     }
1811 }
1812
1813 static char *qdev_get_type(Object *obj, Error **errp)
1814 {
1815     return g_strdup(object_get_typename(obj));
1816 }
1817
1818 static void property_get_uint8_ptr(Object *obj, Visitor *v,
1819                                    void *opaque, const char *name,
1820                                    Error **errp)
1821 {
1822     uint8_t value = *(uint8_t *)opaque;
1823     visit_type_uint8(v, &value, name, errp);
1824 }
1825
1826 static void property_get_uint16_ptr(Object *obj, Visitor *v,
1827                                    void *opaque, const char *name,
1828                                    Error **errp)
1829 {
1830     uint16_t value = *(uint16_t *)opaque;
1831     visit_type_uint16(v, &value, name, errp);
1832 }
1833
1834 static void property_get_uint32_ptr(Object *obj, Visitor *v,
1835                                    void *opaque, const char *name,
1836                                    Error **errp)
1837 {
1838     uint32_t value = *(uint32_t *)opaque;
1839     visit_type_uint32(v, &value, name, errp);
1840 }
1841
1842 static void property_get_uint64_ptr(Object *obj, Visitor *v,
1843                                    void *opaque, const char *name,
1844                                    Error **errp)
1845 {
1846     uint64_t value = *(uint64_t *)opaque;
1847     visit_type_uint64(v, &value, name, errp);
1848 }
1849
1850 void object_property_add_uint8_ptr(Object *obj, const char *name,
1851                                    const uint8_t *v, Error **errp)
1852 {
1853     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
1854                         NULL, NULL, (void *)v, errp);
1855 }
1856
1857 void object_property_add_uint16_ptr(Object *obj, const char *name,
1858                                     const uint16_t *v, Error **errp)
1859 {
1860     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
1861                         NULL, NULL, (void *)v, errp);
1862 }
1863
1864 void object_property_add_uint32_ptr(Object *obj, const char *name,
1865                                     const uint32_t *v, Error **errp)
1866 {
1867     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
1868                         NULL, NULL, (void *)v, errp);
1869 }
1870
1871 void object_property_add_uint64_ptr(Object *obj, const char *name,
1872                                     const uint64_t *v, Error **errp)
1873 {
1874     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
1875                         NULL, NULL, (void *)v, errp);
1876 }
1877
1878 typedef struct {
1879     Object *target_obj;
1880     char *target_name;
1881 } AliasProperty;
1882
1883 static void property_get_alias(Object *obj, struct Visitor *v, void *opaque,
1884                                const char *name, Error **errp)
1885 {
1886     AliasProperty *prop = opaque;
1887
1888     object_property_get(prop->target_obj, v, prop->target_name, errp);
1889 }
1890
1891 static void property_set_alias(Object *obj, struct Visitor *v, void *opaque,
1892                                const char *name, Error **errp)
1893 {
1894     AliasProperty *prop = opaque;
1895
1896     object_property_set(prop->target_obj, v, prop->target_name, errp);
1897 }
1898
1899 static Object *property_resolve_alias(Object *obj, void *opaque,
1900                                       const gchar *part)
1901 {
1902     AliasProperty *prop = opaque;
1903
1904     return object_resolve_path_component(prop->target_obj, prop->target_name);
1905 }
1906
1907 static void property_release_alias(Object *obj, const char *name, void *opaque)
1908 {
1909     AliasProperty *prop = opaque;
1910
1911     g_free(prop->target_name);
1912     g_free(prop);
1913 }
1914
1915 void object_property_add_alias(Object *obj, const char *name,
1916                                Object *target_obj, const char *target_name,
1917                                Error **errp)
1918 {
1919     AliasProperty *prop;
1920     ObjectProperty *op;
1921     ObjectProperty *target_prop;
1922     gchar *prop_type;
1923     Error *local_err = NULL;
1924
1925     target_prop = object_property_find(target_obj, target_name, errp);
1926     if (!target_prop) {
1927         return;
1928     }
1929
1930     if (object_property_is_child(target_prop)) {
1931         prop_type = g_strdup_printf("link%s",
1932                                     target_prop->type + strlen("child"));
1933     } else {
1934         prop_type = g_strdup(target_prop->type);
1935     }
1936
1937     prop = g_malloc(sizeof(*prop));
1938     prop->target_obj = target_obj;
1939     prop->target_name = g_strdup(target_name);
1940
1941     op = object_property_add(obj, name, prop_type,
1942                              property_get_alias,
1943                              property_set_alias,
1944                              property_release_alias,
1945                              prop, &local_err);
1946     if (local_err) {
1947         error_propagate(errp, local_err);
1948         g_free(prop);
1949         goto out;
1950     }
1951     op->resolve = property_resolve_alias;
1952
1953     object_property_set_description(obj, op->name,
1954                                     target_prop->description,
1955                                     &error_abort);
1956
1957 out:
1958     g_free(prop_type);
1959 }
1960
1961 void object_property_set_description(Object *obj, const char *name,
1962                                      const char *description, Error **errp)
1963 {
1964     ObjectProperty *op;
1965
1966     op = object_property_find(obj, name, errp);
1967     if (!op) {
1968         return;
1969     }
1970
1971     g_free(op->description);
1972     op->description = g_strdup(description);
1973 }
1974
1975 static void object_instance_init(Object *obj)
1976 {
1977     object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
1978 }
1979
1980 static void register_types(void)
1981 {
1982     static TypeInfo interface_info = {
1983         .name = TYPE_INTERFACE,
1984         .class_size = sizeof(InterfaceClass),
1985         .abstract = true,
1986     };
1987
1988     static TypeInfo object_info = {
1989         .name = TYPE_OBJECT,
1990         .instance_size = sizeof(Object),
1991         .instance_init = object_instance_init,
1992         .abstract = true,
1993     };
1994
1995     type_interface = type_register_internal(&interface_info);
1996     type_register_internal(&object_info);
1997 }
1998
1999 type_init(register_types)