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 static int do_object_child_foreach(Object *obj,
 779                                    int (*fn)(Object *child, void *opaque),
 780                                    void *opaque, bool recurse)
 781 {
 782     ObjectProperty *prop, *next;
 783     int ret = 0;
 784
 785     QTAILQ_FOREACH_SAFE(prop, &obj->properties, node, next) {
 786         if (object_property_is_child(prop)) {
 787             Object *child = prop->opaque;
 788
 789             ret = fn(child, opaque);
 790             if (ret != 0) {
 791                 break;
 792             }
 793             if (recurse) {
 794                 do_object_child_foreach(child, fn, opaque, true);
 795             }
 796         }
 797     }
 798     return ret;
 799 }
 800
 801 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 802                          void *opaque)
 803 {
 804     return do_object_child_foreach(obj, fn, opaque, false);
 805 }
 806
 807 int object_child_foreach_recursive(Object *obj,
 808                                    int (*fn)(Object *child, void *opaque),
 809                                    void *opaque)
 810 {
 811     return do_object_child_foreach(obj, fn, opaque, true);
 812 }
 813
 814 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 815 {
 816     GSList **list = opaque;
 817
 818     *list = g_slist_prepend(*list, klass);
 819 }
 820
 821 GSList *object_class_get_list(const char *implements_type,
 822                               bool include_abstract)
 823 {
 824     GSList *list = NULL;
 825
 826     object_class_foreach(object_class_get_list_tramp,
 827                          implements_type, include_abstract, &list);
 828     return list;
 829 }
 830
 831 void object_ref(Object *obj)
 832 {
 833     if (!obj) {
 834         return;
 835     }
 836      atomic_inc(&obj->ref);
 837 }
 838
 839 void object_unref(Object *obj)
 840 {
 841     if (!obj) {
 842         return;
 843     }
 844     g_assert(obj->ref > 0);
 845
 846     /* parent always holds a reference to its children */
 847     if (atomic_fetch_dec(&obj->ref) == 1) {
 848         object_finalize(obj);
 849     }
 850 }
 851
 852 ObjectProperty *
 853 object_property_add(Object *obj, const char *name, const char *type,
 854                     ObjectPropertyAccessor *get,
 855                     ObjectPropertyAccessor *set,
 856                     ObjectPropertyRelease *release,
 857                     void *opaque, Error **errp)
 858 {
 859     ObjectProperty *prop;
 860     size_t name_len = strlen(name);
 861
 862     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
 863         int i;
 864         ObjectProperty *ret;
 865         char *name_no_array = g_strdup(name);
 866
 867         name_no_array[name_len - 3] = '\0';
 868         for (i = 0; ; ++i) {
 869             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
 870
 871             ret = object_property_add(obj, full_name, type, get, set,
 872                                       release, opaque, NULL);
 873             g_free(full_name);
 874             if (ret) {
 875                 break;
 876             }
 877         }
 878         g_free(name_no_array);
 879         return ret;
 880     }
 881
 882     QTAILQ_FOREACH(prop, &obj->properties, node) {
 883         if (strcmp(prop->name, name) == 0) {
 884             error_setg(errp, "attempt to add duplicate property '%s'"
 885                        " to object (type '%s')", name,
 886                        object_get_typename(obj));
 887             return NULL;
 888         }
 889     }
 890
 891     prop = g_malloc0(sizeof(*prop));
 892
 893     prop->name = g_strdup(name);
 894     prop->type = g_strdup(type);
 895
 896     prop->get = get;
 897     prop->set = set;
 898     prop->release = release;
 899     prop->opaque = opaque;
 900
 901     QTAILQ_INSERT_TAIL(&obj->properties, prop, node);
 902     return prop;
 903 }
 904
 905 ObjectProperty *object_property_find(Object *obj, const char *name,
 906                                      Error **errp)
 907 {
 908     ObjectProperty *prop;
 909
 910     QTAILQ_FOREACH(prop, &obj->properties, node) {
 911         if (strcmp(prop->name, name) == 0) {
 912             return prop;
 913         }
 914     }
 915
 916     error_setg(errp, "Property '.%s' not found", name);
 917     return NULL;
 918 }
 919
 920 void object_property_del(Object *obj, const char *name, Error **errp)
 921 {
 922     ObjectProperty *prop = object_property_find(obj, name, errp);
 923     if (prop == NULL) {
 924         return;
 925     }
 926
 927     if (prop->release) {
 928         prop->release(obj, name, prop->opaque);
 929     }
 930
 931     QTAILQ_REMOVE(&obj->properties, prop, node);
 932
 933     g_free(prop->name);
 934     g_free(prop->type);
 935     g_free(prop->description);
 936     g_free(prop);
 937 }
 938
 939 void object_property_get(Object *obj, Visitor *v, const char *name,
 940                          Error **errp)
 941 {
 942     ObjectProperty *prop = object_property_find(obj, name, errp);
 943     if (prop == NULL) {
 944         return;
 945     }
 946
 947     if (!prop->get) {
 948         error_setg(errp, QERR_PERMISSION_DENIED);
 949     } else {
 950         prop->get(obj, v, prop->opaque, name, errp);
 951     }
 952 }
 953
 954 void object_property_set(Object *obj, Visitor *v, const char *name,
 955                          Error **errp)
 956 {
 957     ObjectProperty *prop = object_property_find(obj, name, errp);
 958     if (prop == NULL) {
 959         return;
 960     }
 961
 962     if (!prop->set) {
 963         error_setg(errp, QERR_PERMISSION_DENIED);
 964     } else {
 965         prop->set(obj, v, prop->opaque, name, errp);
 966     }
 967 }
 968
 969 void object_property_set_str(Object *obj, const char *value,
 970                              const char *name, Error **errp)
 971 {
 972     QString *qstr = qstring_from_str(value);
 973     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
 974
 975     QDECREF(qstr);
 976 }
 977
 978 char *object_property_get_str(Object *obj, const char *name,
 979                               Error **errp)
 980 {
 981     QObject *ret = object_property_get_qobject(obj, name, errp);
 982     QString *qstring;
 983     char *retval;
 984
 985     if (!ret) {
 986         return NULL;
 987     }
 988     qstring = qobject_to_qstring(ret);
 989     if (!qstring) {
 990         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
 991         retval = NULL;
 992     } else {
 993         retval = g_strdup(qstring_get_str(qstring));
 994     }
 995
 996     QDECREF(qstring);
 997     return retval;
 998 }
 999
1000 void object_property_set_link(Object *obj, Object *value,
1001                               const char *name, Error **errp)
1002 {
1003     if (value) {
1004         gchar *path = object_get_canonical_path(value);
1005         object_property_set_str(obj, path, name, errp);
1006         g_free(path);
1007     } else {
1008         object_property_set_str(obj, "", name, errp);
1009     }
1010 }
1011
1012 Object *object_property_get_link(Object *obj, const char *name,
1013                                  Error **errp)
1014 {
1015     char *str = object_property_get_str(obj, name, errp);
1016     Object *target = NULL;
1017
1018     if (str && *str) {
1019         target = object_resolve_path(str, NULL);
1020         if (!target) {
1021             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1022                       "Device '%s' not found", str);
1023         }
1024     }
1025
1026     g_free(str);
1027     return target;
1028 }
1029
1030 void object_property_set_bool(Object *obj, bool value,
1031                               const char *name, Error **errp)
1032 {
1033     QBool *qbool = qbool_from_bool(value);
1034     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1035
1036     QDECREF(qbool);
1037 }
1038
1039 bool object_property_get_bool(Object *obj, const char *name,
1040                               Error **errp)
1041 {
1042     QObject *ret = object_property_get_qobject(obj, name, errp);
1043     QBool *qbool;
1044     bool retval;
1045
1046     if (!ret) {
1047         return false;
1048     }
1049     qbool = qobject_to_qbool(ret);
1050     if (!qbool) {
1051         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1052         retval = false;
1053     } else {
1054         retval = qbool_get_bool(qbool);
1055     }
1056
1057     QDECREF(qbool);
1058     return retval;
1059 }
1060
1061 void object_property_set_int(Object *obj, int64_t value,
1062                              const char *name, Error **errp)
1063 {
1064     QInt *qint = qint_from_int(value);
1065     object_property_set_qobject(obj, QOBJECT(qint), name, errp);
1066
1067     QDECREF(qint);
1068 }
1069
1070 int64_t object_property_get_int(Object *obj, const char *name,
1071                                 Error **errp)
1072 {
1073     QObject *ret = object_property_get_qobject(obj, name, errp);
1074     QInt *qint;
1075     int64_t retval;
1076
1077     if (!ret) {
1078         return -1;
1079     }
1080     qint = qobject_to_qint(ret);
1081     if (!qint) {
1082         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1083         retval = -1;
1084     } else {
1085         retval = qint_get_int(qint);
1086     }
1087
1088     QDECREF(qint);
1089     return retval;
1090 }
1091
1092 typedef struct EnumProperty {
1093     const char * const *strings;
1094     int (*get)(Object *, Error **);
1095     void (*set)(Object *, int, Error **);
1096 } EnumProperty;
1097
1098 int object_property_get_enum(Object *obj, const char *name,
1099                              const char *typename, Error **errp)
1100 {
1101     Error *err = NULL;
1102     StringOutputVisitor *sov;
1103     StringInputVisitor *siv;
1104     char *str;
1105     int ret;
1106     ObjectProperty *prop = object_property_find(obj, name, errp);
1107     EnumProperty *enumprop;
1108
1109     if (prop == NULL) {
1110         return 0;
1111     }
1112
1113     if (!g_str_equal(prop->type, typename)) {
1114         error_setg(errp, "Property %s on %s is not '%s' enum type",
1115                    name, object_class_get_name(
1116                        object_get_class(obj)), typename);
1117         return 0;
1118     }
1119
1120     enumprop = prop->opaque;
1121
1122     sov = string_output_visitor_new(false);
1123     object_property_get(obj, string_output_get_visitor(sov), name, &err);
1124     if (err) {
1125         error_propagate(errp, err);
1126         string_output_visitor_cleanup(sov);
1127         return 0;
1128     }
1129     str = string_output_get_string(sov);
1130     siv = string_input_visitor_new(str);
1131     string_output_visitor_cleanup(sov);
1132     visit_type_enum(string_input_get_visitor(siv),
1133                     &ret, enumprop->strings, NULL, name, errp);
1134
1135     g_free(str);
1136     string_input_visitor_cleanup(siv);
1137
1138     return ret;
1139 }
1140
1141 void object_property_get_uint16List(Object *obj, const char *name,
1142                                     uint16List **list, Error **errp)
1143 {
1144     Error *err = NULL;
1145     StringOutputVisitor *ov;
1146     StringInputVisitor *iv;
1147     char *str;
1148
1149     ov = string_output_visitor_new(false);
1150     object_property_get(obj, string_output_get_visitor(ov),
1151                         name, &err);
1152     if (err) {
1153         error_propagate(errp, err);
1154         goto out;
1155     }
1156     str = string_output_get_string(ov);
1157     iv = string_input_visitor_new(str);
1158     visit_type_uint16List(string_input_get_visitor(iv),
1159                           list, NULL, errp);
1160
1161     g_free(str);
1162     string_input_visitor_cleanup(iv);
1163 out:
1164     string_output_visitor_cleanup(ov);
1165 }
1166
1167 void object_property_parse(Object *obj, const char *string,
1168                            const char *name, Error **errp)
1169 {
1170     StringInputVisitor *siv;
1171     siv = string_input_visitor_new(string);
1172     object_property_set(obj, string_input_get_visitor(siv), name, errp);
1173
1174     string_input_visitor_cleanup(siv);
1175 }
1176
1177 char *object_property_print(Object *obj, const char *name, bool human,
1178                             Error **errp)
1179 {
1180     StringOutputVisitor *sov;
1181     char *string = NULL;
1182     Error *local_err = NULL;
1183
1184     sov = string_output_visitor_new(human);
1185     object_property_get(obj, string_output_get_visitor(sov), name, &local_err);
1186     if (local_err) {
1187         error_propagate(errp, local_err);
1188         goto out;
1189     }
1190
1191     string = string_output_get_string(sov);
1192
1193 out:
1194     string_output_visitor_cleanup(sov);
1195     return string;
1196 }
1197
1198 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1199 {
1200     ObjectProperty *prop = object_property_find(obj, name, errp);
1201     if (prop == NULL) {
1202         return NULL;
1203     }
1204
1205     return prop->type;
1206 }
1207
1208 Object *object_get_root(void)
1209 {
1210     static Object *root;
1211
1212     if (!root) {
1213         root = object_new("container");
1214     }
1215
1216     return root;
1217 }
1218
1219 Object *object_get_objects_root(void)
1220 {
1221     return container_get(object_get_root(), "/objects");
1222 }
1223
1224 static void object_get_child_property(Object *obj, Visitor *v, void *opaque,
1225                                       const char *name, Error **errp)
1226 {
1227     Object *child = opaque;
1228     gchar *path;
1229
1230     path = object_get_canonical_path(child);
1231     visit_type_str(v, &path, name, errp);
1232     g_free(path);
1233 }
1234
1235 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1236 {
1237     return opaque;
1238 }
1239
1240 static void object_finalize_child_property(Object *obj, const char *name,
1241                                            void *opaque)
1242 {
1243     Object *child = opaque;
1244
1245     if (child->class->unparent) {
1246         (child->class->unparent)(child);
1247     }
1248     child->parent = NULL;
1249     object_unref(child);
1250 }
1251
1252 void object_property_add_child(Object *obj, const char *name,
1253                                Object *child, Error **errp)
1254 {
1255     Error *local_err = NULL;
1256     gchar *type;
1257     ObjectProperty *op;
1258
1259     if (child->parent != NULL) {
1260         error_setg(errp, "child object is already parented");
1261         return;
1262     }
1263
1264     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1265
1266     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1267                              object_finalize_child_property, child, &local_err);
1268     if (local_err) {
1269         error_propagate(errp, local_err);
1270         goto out;
1271     }
1272
1273     op->resolve = object_resolve_child_property;
1274     object_ref(child);
1275     child->parent = obj;
1276
1277 out:
1278     g_free(type);
1279 }
1280
1281 void object_property_allow_set_link(Object *obj, const char *name,
1282                                     Object *val, Error **errp)
1283 {
1284     /* Allow the link to be set, always */
1285 }
1286
1287 typedef struct {
1288     Object **child;
1289     void (*check)(Object *, const char *, Object *, Error **);
1290     ObjectPropertyLinkFlags flags;
1291 } LinkProperty;
1292
1293 static void object_get_link_property(Object *obj, Visitor *v, void *opaque,
1294                                      const char *name, Error **errp)
1295 {
1296     LinkProperty *lprop = opaque;
1297     Object **child = lprop->child;
1298     gchar *path;
1299
1300     if (*child) {
1301         path = object_get_canonical_path(*child);
1302         visit_type_str(v, &path, name, errp);
1303         g_free(path);
1304     } else {
1305         path = (gchar *)"";
1306         visit_type_str(v, &path, name, errp);
1307     }
1308 }
1309
1310 /*
1311  * object_resolve_link:
1312  *
1313  * Lookup an object and ensure its type matches the link property type.  This
1314  * is similar to object_resolve_path() except type verification against the
1315  * link property is performed.
1316  *
1317  * Returns: The matched object or NULL on path lookup failures.
1318  */
1319 static Object *object_resolve_link(Object *obj, const char *name,
1320                                    const char *path, Error **errp)
1321 {
1322     const char *type;
1323     gchar *target_type;
1324     bool ambiguous = false;
1325     Object *target;
1326
1327     /* Go from link<FOO> to FOO.  */
1328     type = object_property_get_type(obj, name, NULL);
1329     target_type = g_strndup(&type[5], strlen(type) - 6);
1330     target = object_resolve_path_type(path, target_type, &ambiguous);
1331
1332     if (ambiguous) {
1333         error_set(errp, ERROR_CLASS_GENERIC_ERROR,
1334                   "Path '%s' does not uniquely identify an object", path);
1335     } else if (!target) {
1336         target = object_resolve_path(path, &ambiguous);
1337         if (target || ambiguous) {
1338             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1339         } else {
1340             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1341                       "Device '%s' not found", path);
1342         }
1343         target = NULL;
1344     }
1345     g_free(target_type);
1346
1347     return target;
1348 }
1349
1350 static void object_set_link_property(Object *obj, Visitor *v, void *opaque,
1351                                      const char *name, Error **errp)
1352 {
1353     Error *local_err = NULL;
1354     LinkProperty *prop = opaque;
1355     Object **child = prop->child;
1356     Object *old_target = *child;
1357     Object *new_target = NULL;
1358     char *path = NULL;
1359
1360     visit_type_str(v, &path, name, &local_err);
1361
1362     if (!local_err && strcmp(path, "") != 0) {
1363         new_target = object_resolve_link(obj, name, path, &local_err);
1364     }
1365
1366     g_free(path);
1367     if (local_err) {
1368         error_propagate(errp, local_err);
1369         return;
1370     }
1371
1372     prop->check(obj, name, new_target, &local_err);
1373     if (local_err) {
1374         error_propagate(errp, local_err);
1375         return;
1376     }
1377
1378     object_ref(new_target);
1379     *child = new_target;
1380     object_unref(old_target);
1381 }
1382
1383 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1384 {
1385     LinkProperty *lprop = opaque;
1386
1387     return *lprop->child;
1388 }
1389
1390 static void object_release_link_property(Object *obj, const char *name,
1391                                          void *opaque)
1392 {
1393     LinkProperty *prop = opaque;
1394
1395     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1396         object_unref(*prop->child);
1397     }
1398     g_free(prop);
1399 }
1400
1401 void object_property_add_link(Object *obj, const char *name,
1402                               const char *type, Object **child,
1403                               void (*check)(Object *, const char *,
1404                                             Object *, Error **),
1405                               ObjectPropertyLinkFlags flags,
1406                               Error **errp)
1407 {
1408     Error *local_err = NULL;
1409     LinkProperty *prop = g_malloc(sizeof(*prop));
1410     gchar *full_type;
1411     ObjectProperty *op;
1412
1413     prop->child = child;
1414     prop->check = check;
1415     prop->flags = flags;
1416
1417     full_type = g_strdup_printf("link<%s>", type);
1418
1419     op = object_property_add(obj, name, full_type,
1420                              object_get_link_property,
1421                              check ? object_set_link_property : NULL,
1422                              object_release_link_property,
1423                              prop,
1424                              &local_err);
1425     if (local_err) {
1426         error_propagate(errp, local_err);
1427         g_free(prop);
1428         goto out;
1429     }
1430
1431     op->resolve = object_resolve_link_property;
1432
1433 out:
1434     g_free(full_type);
1435 }
1436
1437 void object_property_add_const_link(Object *obj, const char *name,
1438                                     Object *target, Error **errp)
1439 {
1440     char *link_type;
1441     ObjectProperty *op;
1442
1443     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1444     op = object_property_add(obj, name, link_type,
1445                              object_get_child_property, NULL,
1446                              NULL, target, errp);
1447     if (op != NULL) {
1448         op->resolve = object_resolve_child_property;
1449     }
1450     g_free(link_type);
1451 }
1452
1453 gchar *object_get_canonical_path_component(Object *obj)
1454 {
1455     ObjectProperty *prop = NULL;
1456
1457     g_assert(obj);
1458     g_assert(obj->parent != NULL);
1459
1460     QTAILQ_FOREACH(prop, &obj->parent->properties, node) {
1461         if (!object_property_is_child(prop)) {
1462             continue;
1463         }
1464
1465         if (prop->opaque == obj) {
1466             return g_strdup(prop->name);
1467         }
1468     }
1469
1470     /* obj had a parent but was not a child, should never happen */
1471     g_assert_not_reached();
1472     return NULL;
1473 }
1474
1475 gchar *object_get_canonical_path(Object *obj)
1476 {
1477     Object *root = object_get_root();
1478     char *newpath, *path = NULL;
1479
1480     while (obj != root) {
1481         char *component = object_get_canonical_path_component(obj);
1482
1483         if (path) {
1484             newpath = g_strdup_printf("%s/%s", component, path);
1485             g_free(component);
1486             g_free(path);
1487             path = newpath;
1488         } else {
1489             path = component;
1490         }
1491
1492         obj = obj->parent;
1493     }
1494
1495     newpath = g_strdup_printf("/%s", path ? path : "");
1496     g_free(path);
1497
1498     return newpath;
1499 }
1500
1501 Object *object_resolve_path_component(Object *parent, const gchar *part)
1502 {
1503     ObjectProperty *prop = object_property_find(parent, part, NULL);
1504     if (prop == NULL) {
1505         return NULL;
1506     }
1507
1508     if (prop->resolve) {
1509         return prop->resolve(parent, prop->opaque, part);
1510     } else {
1511         return NULL;
1512     }
1513 }
1514
1515 static Object *object_resolve_abs_path(Object *parent,
1516                                           gchar **parts,
1517                                           const char *typename,
1518                                           int index)
1519 {
1520     Object *child;
1521
1522     if (parts[index] == NULL) {
1523         return object_dynamic_cast(parent, typename);
1524     }
1525
1526     if (strcmp(parts[index], "") == 0) {
1527         return object_resolve_abs_path(parent, parts, typename, index + 1);
1528     }
1529
1530     child = object_resolve_path_component(parent, parts[index]);
1531     if (!child) {
1532         return NULL;
1533     }
1534
1535     return object_resolve_abs_path(child, parts, typename, index + 1);
1536 }
1537
1538 static Object *object_resolve_partial_path(Object *parent,
1539                                               gchar **parts,
1540                                               const char *typename,
1541                                               bool *ambiguous)
1542 {
1543     Object *obj;
1544     ObjectProperty *prop;
1545
1546     obj = object_resolve_abs_path(parent, parts, typename, 0);
1547
1548     QTAILQ_FOREACH(prop, &parent->properties, node) {
1549         Object *found;
1550
1551         if (!object_property_is_child(prop)) {
1552             continue;
1553         }
1554
1555         found = object_resolve_partial_path(prop->opaque, parts,
1556                                             typename, ambiguous);
1557         if (found) {
1558             if (obj) {
1559                 if (ambiguous) {
1560                     *ambiguous = true;
1561                 }
1562                 return NULL;
1563             }
1564             obj = found;
1565         }
1566
1567         if (ambiguous && *ambiguous) {
1568             return NULL;
1569         }
1570     }
1571
1572     return obj;
1573 }
1574
1575 Object *object_resolve_path_type(const char *path, const char *typename,
1576                                  bool *ambiguous)
1577 {
1578     Object *obj;
1579     gchar **parts;
1580
1581     parts = g_strsplit(path, "/", 0);
1582     assert(parts);
1583
1584     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1585         if (ambiguous) {
1586             *ambiguous = false;
1587         }
1588         obj = object_resolve_partial_path(object_get_root(), parts,
1589                                           typename, ambiguous);
1590     } else {
1591         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1592     }
1593
1594     g_strfreev(parts);
1595
1596     return obj;
1597 }
1598
1599 Object *object_resolve_path(const char *path, bool *ambiguous)
1600 {
1601     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1602 }
1603
1604 typedef struct StringProperty
1605 {
1606     char *(*get)(Object *, Error **);
1607     void (*set)(Object *, const char *, Error **);
1608 } StringProperty;
1609
1610 static void property_get_str(Object *obj, Visitor *v, void *opaque,
1611                              const char *name, Error **errp)
1612 {
1613     StringProperty *prop = opaque;
1614     char *value;
1615     Error *err = NULL;
1616
1617     value = prop->get(obj, &err);
1618     if (err) {
1619         error_propagate(errp, err);
1620         return;
1621     }
1622
1623     visit_type_str(v, &value, name, errp);
1624     g_free(value);
1625 }
1626
1627 static void property_set_str(Object *obj, Visitor *v, void *opaque,
1628                              const char *name, Error **errp)
1629 {
1630     StringProperty *prop = opaque;
1631     char *value;
1632     Error *local_err = NULL;
1633
1634     visit_type_str(v, &value, name, &local_err);
1635     if (local_err) {
1636         error_propagate(errp, local_err);
1637         return;
1638     }
1639
1640     prop->set(obj, value, errp);
1641     g_free(value);
1642 }
1643
1644 static void property_release_str(Object *obj, const char *name,
1645                                  void *opaque)
1646 {
1647     StringProperty *prop = opaque;
1648     g_free(prop);
1649 }
1650
1651 void object_property_add_str(Object *obj, const char *name,
1652                            char *(*get)(Object *, Error **),
1653                            void (*set)(Object *, const char *, Error **),
1654                            Error **errp)
1655 {
1656     Error *local_err = NULL;
1657     StringProperty *prop = g_malloc0(sizeof(*prop));
1658
1659     prop->get = get;
1660     prop->set = set;
1661
1662     object_property_add(obj, name, "string",
1663                         get ? property_get_str : NULL,
1664                         set ? property_set_str : NULL,
1665                         property_release_str,
1666                         prop, &local_err);
1667     if (local_err) {
1668         error_propagate(errp, local_err);
1669         g_free(prop);
1670     }
1671 }
1672
1673 typedef struct BoolProperty
1674 {
1675     bool (*get)(Object *, Error **);
1676     void (*set)(Object *, bool, Error **);
1677 } BoolProperty;
1678
1679 static void property_get_bool(Object *obj, Visitor *v, void *opaque,
1680                               const char *name, Error **errp)
1681 {
1682     BoolProperty *prop = opaque;
1683     bool value;
1684     Error *err = NULL;
1685
1686     value = prop->get(obj, &err);
1687     if (err) {
1688         error_propagate(errp, err);
1689         return;
1690     }
1691
1692     visit_type_bool(v, &value, name, errp);
1693 }
1694
1695 static void property_set_bool(Object *obj, Visitor *v, void *opaque,
1696                               const char *name, Error **errp)
1697 {
1698     BoolProperty *prop = opaque;
1699     bool value;
1700     Error *local_err = NULL;
1701
1702     visit_type_bool(v, &value, name, &local_err);
1703     if (local_err) {
1704         error_propagate(errp, local_err);
1705         return;
1706     }
1707
1708     prop->set(obj, value, errp);
1709 }
1710
1711 static void property_release_bool(Object *obj, const char *name,
1712                                   void *opaque)
1713 {
1714     BoolProperty *prop = opaque;
1715     g_free(prop);
1716 }
1717
1718 void object_property_add_bool(Object *obj, const char *name,
1719                               bool (*get)(Object *, Error **),
1720                               void (*set)(Object *, bool, Error **),
1721                               Error **errp)
1722 {
1723     Error *local_err = NULL;
1724     BoolProperty *prop = g_malloc0(sizeof(*prop));
1725
1726     prop->get = get;
1727     prop->set = set;
1728
1729     object_property_add(obj, name, "bool",
1730                         get ? property_get_bool : NULL,
1731                         set ? property_set_bool : NULL,
1732                         property_release_bool,
1733                         prop, &local_err);
1734     if (local_err) {
1735         error_propagate(errp, local_err);
1736         g_free(prop);
1737     }
1738 }
1739
1740 static void property_get_enum(Object *obj, Visitor *v, void *opaque,
1741                               const char *name, Error **errp)
1742 {
1743     EnumProperty *prop = opaque;
1744     int value;
1745     Error *err = NULL;
1746
1747     value = prop->get(obj, &err);
1748     if (err) {
1749         error_propagate(errp, err);
1750         return;
1751     }
1752
1753     visit_type_enum(v, &value, prop->strings, NULL, name, errp);
1754 }
1755
1756 static void property_set_enum(Object *obj, Visitor *v, void *opaque,
1757                               const char *name, Error **errp)
1758 {
1759     EnumProperty *prop = opaque;
1760     int value;
1761     Error *err = NULL;
1762
1763     visit_type_enum(v, &value, prop->strings, NULL, name, &err);
1764     if (err) {
1765         error_propagate(errp, err);
1766         return;
1767     }
1768     prop->set(obj, value, errp);
1769 }
1770
1771 static void property_release_enum(Object *obj, const char *name,
1772                                   void *opaque)
1773 {
1774     EnumProperty *prop = opaque;
1775     g_free(prop);
1776 }
1777
1778 void object_property_add_enum(Object *obj, const char *name,
1779                               const char *typename,
1780                               const char * const *strings,
1781                               int (*get)(Object *, Error **),
1782                               void (*set)(Object *, int, Error **),
1783                               Error **errp)
1784 {
1785     Error *local_err = NULL;
1786     EnumProperty *prop = g_malloc(sizeof(*prop));
1787
1788     prop->strings = strings;
1789     prop->get = get;
1790     prop->set = set;
1791
1792     object_property_add(obj, name, typename,
1793                         get ? property_get_enum : NULL,
1794                         set ? property_set_enum : NULL,
1795                         property_release_enum,
1796                         prop, &local_err);
1797     if (local_err) {
1798         error_propagate(errp, local_err);
1799         g_free(prop);
1800     }
1801 }
1802
1803 typedef struct TMProperty {
1804     void (*get)(Object *, struct tm *, Error **);
1805 } TMProperty;
1806
1807 static void property_get_tm(Object *obj, Visitor *v, void *opaque,
1808                             const char *name, Error **errp)
1809 {
1810     TMProperty *prop = opaque;
1811     Error *err = NULL;
1812     struct tm value;
1813
1814     prop->get(obj, &value, &err);
1815     if (err) {
1816         goto out;
1817     }
1818
1819     visit_start_struct(v, NULL, "struct tm", name, 0, &err);
1820     if (err) {
1821         goto out;
1822     }
1823     visit_type_int32(v, &value.tm_year, "tm_year", &err);
1824     if (err) {
1825         goto out_end;
1826     }
1827     visit_type_int32(v, &value.tm_mon, "tm_mon", &err);
1828     if (err) {
1829         goto out_end;
1830     }
1831     visit_type_int32(v, &value.tm_mday, "tm_mday", &err);
1832     if (err) {
1833         goto out_end;
1834     }
1835     visit_type_int32(v, &value.tm_hour, "tm_hour", &err);
1836     if (err) {
1837         goto out_end;
1838     }
1839     visit_type_int32(v, &value.tm_min, "tm_min", &err);
1840     if (err) {
1841         goto out_end;
1842     }
1843     visit_type_int32(v, &value.tm_sec, "tm_sec", &err);
1844     if (err) {
1845         goto out_end;
1846     }
1847 out_end:
1848     error_propagate(errp, err);
1849     err = NULL;
1850     visit_end_struct(v, errp);
1851 out:
1852     error_propagate(errp, err);
1853
1854 }
1855
1856 static void property_release_tm(Object *obj, const char *name,
1857                                 void *opaque)
1858 {
1859     TMProperty *prop = opaque;
1860     g_free(prop);
1861 }
1862
1863 void object_property_add_tm(Object *obj, const char *name,
1864                             void (*get)(Object *, struct tm *, Error **),
1865                             Error **errp)
1866 {
1867     Error *local_err = NULL;
1868     TMProperty *prop = g_malloc0(sizeof(*prop));
1869
1870     prop->get = get;
1871
1872     object_property_add(obj, name, "struct tm",
1873                         get ? property_get_tm : NULL, NULL,
1874                         property_release_tm,
1875                         prop, &local_err);
1876     if (local_err) {
1877         error_propagate(errp, local_err);
1878         g_free(prop);
1879     }
1880 }
1881
1882 static char *qdev_get_type(Object *obj, Error **errp)
1883 {
1884     return g_strdup(object_get_typename(obj));
1885 }
1886
1887 static void property_get_uint8_ptr(Object *obj, Visitor *v,
1888                                    void *opaque, const char *name,
1889                                    Error **errp)
1890 {
1891     uint8_t value = *(uint8_t *)opaque;
1892     visit_type_uint8(v, &value, name, errp);
1893 }
1894
1895 static void property_get_uint16_ptr(Object *obj, Visitor *v,
1896                                    void *opaque, const char *name,
1897                                    Error **errp)
1898 {
1899     uint16_t value = *(uint16_t *)opaque;
1900     visit_type_uint16(v, &value, name, errp);
1901 }
1902
1903 static void property_get_uint32_ptr(Object *obj, Visitor *v,
1904                                    void *opaque, const char *name,
1905                                    Error **errp)
1906 {
1907     uint32_t value = *(uint32_t *)opaque;
1908     visit_type_uint32(v, &value, name, errp);
1909 }
1910
1911 static void property_get_uint64_ptr(Object *obj, Visitor *v,
1912                                    void *opaque, const char *name,
1913                                    Error **errp)
1914 {
1915     uint64_t value = *(uint64_t *)opaque;
1916     visit_type_uint64(v, &value, name, errp);
1917 }
1918
1919 void object_property_add_uint8_ptr(Object *obj, const char *name,
1920                                    const uint8_t *v, Error **errp)
1921 {
1922     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
1923                         NULL, NULL, (void *)v, errp);
1924 }
1925
1926 void object_property_add_uint16_ptr(Object *obj, const char *name,
1927                                     const uint16_t *v, Error **errp)
1928 {
1929     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
1930                         NULL, NULL, (void *)v, errp);
1931 }
1932
1933 void object_property_add_uint32_ptr(Object *obj, const char *name,
1934                                     const uint32_t *v, Error **errp)
1935 {
1936     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
1937                         NULL, NULL, (void *)v, errp);
1938 }
1939
1940 void object_property_add_uint64_ptr(Object *obj, const char *name,
1941                                     const uint64_t *v, Error **errp)
1942 {
1943     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
1944                         NULL, NULL, (void *)v, errp);
1945 }
1946
1947 typedef struct {
1948     Object *target_obj;
1949     char *target_name;
1950 } AliasProperty;
1951
1952 static void property_get_alias(Object *obj, struct Visitor *v, void *opaque,
1953                                const char *name, Error **errp)
1954 {
1955     AliasProperty *prop = opaque;
1956
1957     object_property_get(prop->target_obj, v, prop->target_name, errp);
1958 }
1959
1960 static void property_set_alias(Object *obj, struct Visitor *v, void *opaque,
1961                                const char *name, Error **errp)
1962 {
1963     AliasProperty *prop = opaque;
1964
1965     object_property_set(prop->target_obj, v, prop->target_name, errp);
1966 }
1967
1968 static Object *property_resolve_alias(Object *obj, void *opaque,
1969                                       const gchar *part)
1970 {
1971     AliasProperty *prop = opaque;
1972
1973     return object_resolve_path_component(prop->target_obj, prop->target_name);
1974 }
1975
1976 static void property_release_alias(Object *obj, const char *name, void *opaque)
1977 {
1978     AliasProperty *prop = opaque;
1979
1980     g_free(prop->target_name);
1981     g_free(prop);
1982 }
1983
1984 void object_property_add_alias(Object *obj, const char *name,
1985                                Object *target_obj, const char *target_name,
1986                                Error **errp)
1987 {
1988     AliasProperty *prop;
1989     ObjectProperty *op;
1990     ObjectProperty *target_prop;
1991     gchar *prop_type;
1992     Error *local_err = NULL;
1993
1994     target_prop = object_property_find(target_obj, target_name, errp);
1995     if (!target_prop) {
1996         return;
1997     }
1998
1999     if (object_property_is_child(target_prop)) {
2000         prop_type = g_strdup_printf("link%s",
2001                                     target_prop->type + strlen("child"));
2002     } else {
2003         prop_type = g_strdup(target_prop->type);
2004     }
2005
2006     prop = g_malloc(sizeof(*prop));
2007     prop->target_obj = target_obj;
2008     prop->target_name = g_strdup(target_name);
2009
2010     op = object_property_add(obj, name, prop_type,
2011                              property_get_alias,
2012                              property_set_alias,
2013                              property_release_alias,
2014                              prop, &local_err);
2015     if (local_err) {
2016         error_propagate(errp, local_err);
2017         g_free(prop);
2018         goto out;
2019     }
2020     op->resolve = property_resolve_alias;
2021
2022     object_property_set_description(obj, op->name,
2023                                     target_prop->description,
2024                                     &error_abort);
2025
2026 out:
2027     g_free(prop_type);
2028 }
2029
2030 void object_property_set_description(Object *obj, const char *name,
2031                                      const char *description, Error **errp)
2032 {
2033     ObjectProperty *op;
2034
2035     op = object_property_find(obj, name, errp);
2036     if (!op) {
2037         return;
2038     }
2039
2040     g_free(op->description);
2041     op->description = g_strdup(description);
2042 }
2043
2044 static void object_instance_init(Object *obj)
2045 {
2046     object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
2047 }
2048
2049 static void register_types(void)
2050 {
2051     static TypeInfo interface_info = {
2052         .name = TYPE_INTERFACE,
2053         .class_size = sizeof(InterfaceClass),
2054         .abstract = true,
2055     };
2056
2057     static TypeInfo object_info = {
2058         .name = TYPE_OBJECT,
2059         .instance_size = sizeof(Object),
2060         .instance_init = object_instance_init,
2061         .abstract = true,
2062     };
2063
2064     type_interface = type_register_internal(&interface_info);
2065     type_register_internal(&object_info);
2066 }
2067
2068 type_init(register_types)