qom/object.c

   1 /*
   2  * QEMU Object Model
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "qapi/error.h"
  15 #include "qom/object.h"
  16 #include "qom/object_interfaces.h"
  17 #include "qemu/cutils.h"
  18 #include "qapi/visitor.h"
  19 #include "qapi-visit.h"
  20 #include "qapi/string-input-visitor.h"
  21 #include "qapi/string-output-visitor.h"
  22 #include "qapi/qmp/qerror.h"
  23 #include "trace.h"
  24
  25 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  26  * of the QOM core on QObject?  */
  27 #include "qom/qom-qobject.h"
  28 #include "qapi/qmp/qobject.h"
  29 #include "qapi/qmp/qbool.h"
  30 #include "qapi/qmp/qint.h"
  31 #include "qapi/qmp/qstring.h"
  32
  33 #define MAX_INTERFACES 32
  34
  35 typedef struct InterfaceImpl InterfaceImpl;
  36 typedef struct TypeImpl TypeImpl;
  37
  38 struct InterfaceImpl
  39 {
  40     const char *typename;
  41 };
  42
  43 struct TypeImpl
  44 {
  45     const char *name;
  46
  47     size_t class_size;
  48
  49     size_t instance_size;
  50
  51     void (*class_init)(ObjectClass *klass, void *data);
  52     void (*class_base_init)(ObjectClass *klass, void *data);
  53     void (*class_finalize)(ObjectClass *klass, void *data);
  54
  55     void *class_data;
  56
  57     void (*instance_init)(Object *obj);
  58     void (*instance_post_init)(Object *obj);
  59     void (*instance_finalize)(Object *obj);
  60
  61     bool abstract;
  62
  63     const char *parent;
  64     TypeImpl *parent_type;
  65
  66     ObjectClass *class;
  67
  68     int num_interfaces;
  69     InterfaceImpl interfaces[MAX_INTERFACES];
  70 };
  71
  72 static Type type_interface;
  73
  74 static GHashTable *type_table_get(void)
  75 {
  76     static GHashTable *type_table;
  77
  78     if (type_table == NULL) {
  79         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  80     }
  81
  82     return type_table;
  83 }
  84
  85 static bool enumerating_types;
  86
  87 static void type_table_add(TypeImpl *ti)
  88 {
  89     assert(!enumerating_types);
  90     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  91 }
  92
  93 static TypeImpl *type_table_lookup(const char *name)
  94 {
  95     return g_hash_table_lookup(type_table_get(), name);
  96 }
  97
  98 static TypeImpl *type_new(const TypeInfo *info)
  99 {
 100     TypeImpl *ti = g_malloc0(sizeof(*ti));
 101     int i;
 102
 103     g_assert(info->name != NULL);
 104
 105     if (type_table_lookup(info->name) != NULL) {
 106         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 107         abort();
 108     }
 109
 110     ti->name = g_strdup(info->name);
 111     ti->parent = g_strdup(info->parent);
 112
 113     ti->class_size = info->class_size;
 114     ti->instance_size = info->instance_size;
 115
 116     ti->class_init = info->class_init;
 117     ti->class_base_init = info->class_base_init;
 118     ti->class_finalize = info->class_finalize;
 119     ti->class_data = info->class_data;
 120
 121     ti->instance_init = info->instance_init;
 122     ti->instance_post_init = info->instance_post_init;
 123     ti->instance_finalize = info->instance_finalize;
 124
 125     ti->abstract = info->abstract;
 126
 127     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 128         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 129     }
 130     ti->num_interfaces = i;
 131
 132     return ti;
 133 }
 134
 135 static TypeImpl *type_register_internal(const TypeInfo *info)
 136 {
 137     TypeImpl *ti;
 138     ti = type_new(info);
 139
 140     type_table_add(ti);
 141     return ti;
 142 }
 143
 144 TypeImpl *type_register(const TypeInfo *info)
 145 {
 146     assert(info->parent);
 147     return type_register_internal(info);
 148 }
 149
 150 TypeImpl *type_register_static(const TypeInfo *info)
 151 {
 152     return type_register(info);
 153 }
 154
 155 static TypeImpl *type_get_by_name(const char *name)
 156 {
 157     if (name == NULL) {
 158         return NULL;
 159     }
 160
 161     return type_table_lookup(name);
 162 }
 163
 164 static TypeImpl *type_get_parent(TypeImpl *type)
 165 {
 166     if (!type->parent_type && type->parent) {
 167         type->parent_type = type_get_by_name(type->parent);
 168         g_assert(type->parent_type != NULL);
 169     }
 170
 171     return type->parent_type;
 172 }
 173
 174 static bool type_has_parent(TypeImpl *type)
 175 {
 176     return (type->parent != NULL);
 177 }
 178
 179 static size_t type_class_get_size(TypeImpl *ti)
 180 {
 181     if (ti->class_size) {
 182         return ti->class_size;
 183     }
 184
 185     if (type_has_parent(ti)) {
 186         return type_class_get_size(type_get_parent(ti));
 187     }
 188
 189     return sizeof(ObjectClass);
 190 }
 191
 192 static size_t type_object_get_size(TypeImpl *ti)
 193 {
 194     if (ti->instance_size) {
 195         return ti->instance_size;
 196     }
 197
 198     if (type_has_parent(ti)) {
 199         return type_object_get_size(type_get_parent(ti));
 200     }
 201
 202     return 0;
 203 }
 204
 205 size_t object_type_get_instance_size(const char *typename)
 206 {
 207     TypeImpl *type = type_get_by_name(typename);
 208
 209     g_assert(type != NULL);
 210     return type_object_get_size(type);
 211 }
 212
 213 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 214 {
 215     assert(target_type);
 216
 217     /* Check if target_type is a direct ancestor of type */
 218     while (type) {
 219         if (type == target_type) {
 220             return true;
 221         }
 222
 223         type = type_get_parent(type);
 224     }
 225
 226     return false;
 227 }
 228
 229 static void type_initialize(TypeImpl *ti);
 230
 231 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 232                                       TypeImpl *parent_type)
 233 {
 234     InterfaceClass *new_iface;
 235     TypeInfo info = { };
 236     TypeImpl *iface_impl;
 237
 238     info.parent = parent_type->name;
 239     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 240     info.abstract = true;
 241
 242     iface_impl = type_new(&info);
 243     iface_impl->parent_type = parent_type;
 244     type_initialize(iface_impl);
 245     g_free((char *)info.name);
 246
 247     new_iface = (InterfaceClass *)iface_impl->class;
 248     new_iface->concrete_class = ti->class;
 249     new_iface->interface_type = interface_type;
 250
 251     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 252                                            iface_impl->class);
 253 }
 254
 255 static void object_property_free(gpointer data)
 256 {
 257     ObjectProperty *prop = data;
 258
 259     g_free(prop->name);
 260     g_free(prop->type);
 261     g_free(prop->description);
 262     g_free(prop);
 263 }
 264
 265 static void type_initialize(TypeImpl *ti)
 266 {
 267     TypeImpl *parent;
 268
 269     if (ti->class) {
 270         return;
 271     }
 272
 273     ti->class_size = type_class_get_size(ti);
 274     ti->instance_size = type_object_get_size(ti);
 275
 276     ti->class = g_malloc0(ti->class_size);
 277
 278     parent = type_get_parent(ti);
 279     if (parent) {
 280         type_initialize(parent);
 281         GSList *e;
 282         int i;
 283
 284         g_assert_cmpint(parent->class_size, <=, ti->class_size);
 285         memcpy(ti->class, parent->class, parent->class_size);
 286         ti->class->interfaces = NULL;
 287         ti->class->properties = g_hash_table_new_full(
 288             g_str_hash, g_str_equal, g_free, object_property_free);
 289
 290         for (e = parent->class->interfaces; e; e = e->next) {
 291             InterfaceClass *iface = e->data;
 292             ObjectClass *klass = OBJECT_CLASS(iface);
 293
 294             type_initialize_interface(ti, iface->interface_type, klass->type);
 295         }
 296
 297         for (i = 0; i < ti->num_interfaces; i++) {
 298             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 299             for (e = ti->class->interfaces; e; e = e->next) {
 300                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 301
 302                 if (type_is_ancestor(target_type, t)) {
 303                     break;
 304                 }
 305             }
 306
 307             if (e) {
 308                 continue;
 309             }
 310
 311             type_initialize_interface(ti, t, t);
 312         }
 313     } else {
 314         ti->class->properties = g_hash_table_new_full(
 315             g_str_hash, g_str_equal, g_free, object_property_free);
 316     }
 317
 318     ti->class->type = ti;
 319
 320     while (parent) {
 321         if (parent->class_base_init) {
 322             parent->class_base_init(ti->class, ti->class_data);
 323         }
 324         parent = type_get_parent(parent);
 325     }
 326
 327     if (ti->class_init) {
 328         ti->class_init(ti->class, ti->class_data);
 329     }
 330 }
 331
 332 static void object_init_with_type(Object *obj, TypeImpl *ti)
 333 {
 334     if (type_has_parent(ti)) {
 335         object_init_with_type(obj, type_get_parent(ti));
 336     }
 337
 338     if (ti->instance_init) {
 339         ti->instance_init(obj);
 340     }
 341 }
 342
 343 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 344 {
 345     if (ti->instance_post_init) {
 346         ti->instance_post_init(obj);
 347     }
 348
 349     if (type_has_parent(ti)) {
 350         object_post_init_with_type(obj, type_get_parent(ti));
 351     }
 352 }
 353
 354 void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 355 {
 356     Object *obj = data;
 357
 358     g_assert(type != NULL);
 359     type_initialize(type);
 360
 361     g_assert_cmpint(type->instance_size, >=, sizeof(Object));
 362     g_assert(type->abstract == false);
 363     g_assert_cmpint(size, >=, type->instance_size);
 364
 365     memset(obj, 0, type->instance_size);
 366     obj->class = type->class;
 367     object_ref(obj);
 368     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 369                                             NULL, object_property_free);
 370     object_init_with_type(obj, type);
 371     object_post_init_with_type(obj, type);
 372 }
 373
 374 void object_initialize(void *data, size_t size, const char *typename)
 375 {
 376     TypeImpl *type = type_get_by_name(typename);
 377
 378     object_initialize_with_type(data, size, type);
 379 }
 380
 381 static inline bool object_property_is_child(ObjectProperty *prop)
 382 {
 383     return strstart(prop->type, "child<", NULL);
 384 }
 385
 386 static void object_property_del_all(Object *obj)
 387 {
 388     ObjectProperty *prop;
 389     GHashTableIter iter;
 390     gpointer key, value;
 391     bool released;
 392
 393     do {
 394         released = false;
 395         g_hash_table_iter_init(&iter, obj->properties);
 396         while (g_hash_table_iter_next(&iter, &key, &value)) {
 397             prop = value;
 398             if (prop->release) {
 399                 prop->release(obj, prop->name, prop->opaque);
 400                 prop->release = NULL;
 401                 released = true;
 402                 break;
 403             }
 404             g_hash_table_iter_remove(&iter);
 405         }
 406     } while (released);
 407
 408     g_hash_table_unref(obj->properties);
 409 }
 410
 411 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 412 {
 413     ObjectProperty *prop;
 414     GHashTableIter iter;
 415     gpointer key, value;
 416
 417     g_hash_table_iter_init(&iter, obj->properties);
 418     while (g_hash_table_iter_next(&iter, &key, &value)) {
 419         prop = value;
 420         if (object_property_is_child(prop) && prop->opaque == child) {
 421             if (prop->release) {
 422                 prop->release(obj, prop->name, prop->opaque);
 423                 prop->release = NULL;
 424             }
 425             break;
 426         }
 427     }
 428     g_hash_table_iter_init(&iter, obj->properties);
 429     while (g_hash_table_iter_next(&iter, &key, &value)) {
 430         prop = value;
 431         if (object_property_is_child(prop) && prop->opaque == child) {
 432             g_hash_table_iter_remove(&iter);
 433             break;
 434         }
 435     }
 436 }
 437
 438 void object_unparent(Object *obj)
 439 {
 440     if (obj->parent) {
 441         object_property_del_child(obj->parent, obj, NULL);
 442     }
 443 }
 444
 445 static void object_deinit(Object *obj, TypeImpl *type)
 446 {
 447     if (type->instance_finalize) {
 448         type->instance_finalize(obj);
 449     }
 450
 451     if (type_has_parent(type)) {
 452         object_deinit(obj, type_get_parent(type));
 453     }
 454 }
 455
 456 static void object_finalize(void *data)
 457 {
 458     Object *obj = data;
 459     TypeImpl *ti = obj->class->type;
 460
 461     object_property_del_all(obj);
 462     object_deinit(obj, ti);
 463
 464     g_assert_cmpint(obj->ref, ==, 0);
 465     if (obj->free) {
 466         obj->free(obj);
 467     }
 468 }
 469
 470 Object *object_new_with_type(Type type)
 471 {
 472     Object *obj;
 473
 474     g_assert(type != NULL);
 475     type_initialize(type);
 476
 477     obj = g_malloc(type->instance_size);
 478     object_initialize_with_type(obj, type->instance_size, type);
 479     obj->free = g_free;
 480
 481     return obj;
 482 }
 483
 484 Object *object_new(const char *typename)
 485 {
 486     TypeImpl *ti = type_get_by_name(typename);
 487
 488     return object_new_with_type(ti);
 489 }
 490
 491
 492 Object *object_new_with_props(const char *typename,
 493                               Object *parent,
 494                               const char *id,
 495                               Error **errp,
 496                               ...)
 497 {
 498     va_list vargs;
 499     Object *obj;
 500
 501     va_start(vargs, errp);
 502     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 503     va_end(vargs);
 504
 505     return obj;
 506 }
 507
 508
 509 Object *object_new_with_propv(const char *typename,
 510                               Object *parent,
 511                               const char *id,
 512                               Error **errp,
 513                               va_list vargs)
 514 {
 515     Object *obj;
 516     ObjectClass *klass;
 517     Error *local_err = NULL;
 518
 519     klass = object_class_by_name(typename);
 520     if (!klass) {
 521         error_setg(errp, "invalid object type: %s", typename);
 522         return NULL;
 523     }
 524
 525     if (object_class_is_abstract(klass)) {
 526         error_setg(errp, "object type '%s' is abstract", typename);
 527         return NULL;
 528     }
 529     obj = object_new(typename);
 530
 531     if (object_set_propv(obj, &local_err, vargs) < 0) {
 532         goto error;
 533     }
 534
 535     object_property_add_child(parent, id, obj, &local_err);
 536     if (local_err) {
 537         goto error;
 538     }
 539
 540     if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
 541         user_creatable_complete(obj, &local_err);
 542         if (local_err) {
 543             object_unparent(obj);
 544             goto error;
 545         }
 546     }
 547
 548     object_unref(OBJECT(obj));
 549     return obj;
 550
 551  error:
 552     error_propagate(errp, local_err);
 553     object_unref(obj);
 554     return NULL;
 555 }
 556
 557
 558 int object_set_props(Object *obj,
 559                      Error **errp,
 560                      ...)
 561 {
 562     va_list vargs;
 563     int ret;
 564
 565     va_start(vargs, errp);
 566     ret = object_set_propv(obj, errp, vargs);
 567     va_end(vargs);
 568
 569     return ret;
 570 }
 571
 572
 573 int object_set_propv(Object *obj,
 574                      Error **errp,
 575                      va_list vargs)
 576 {
 577     const char *propname;
 578     Error *local_err = NULL;
 579
 580     propname = va_arg(vargs, char *);
 581     while (propname != NULL) {
 582         const char *value = va_arg(vargs, char *);
 583
 584         g_assert(value != NULL);
 585         object_property_parse(obj, value, propname, &local_err);
 586         if (local_err) {
 587             error_propagate(errp, local_err);
 588             return -1;
 589         }
 590         propname = va_arg(vargs, char *);
 591     }
 592
 593     return 0;
 594 }
 595
 596
 597 Object *object_dynamic_cast(Object *obj, const char *typename)
 598 {
 599     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 600         return obj;
 601     }
 602
 603     return NULL;
 604 }
 605
 606 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 607                                    const char *file, int line, const char *func)
 608 {
 609     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 610                                      typename, file, line, func);
 611
 612 #ifdef CONFIG_QOM_CAST_DEBUG
 613     int i;
 614     Object *inst;
 615
 616     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 617         if (obj->class->object_cast_cache[i] == typename) {
 618             goto out;
 619         }
 620     }
 621
 622     inst = object_dynamic_cast(obj, typename);
 623
 624     if (!inst && obj) {
 625         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 626                 file, line, func, obj, typename);
 627         abort();
 628     }
 629
 630     assert(obj == inst);
 631
 632     if (obj && obj == inst) {
 633         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 634             obj->class->object_cast_cache[i - 1] =
 635                     obj->class->object_cast_cache[i];
 636         }
 637         obj->class->object_cast_cache[i - 1] = typename;
 638     }
 639
 640 out:
 641 #endif
 642     return obj;
 643 }
 644
 645 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 646                                        const char *typename)
 647 {
 648     ObjectClass *ret = NULL;
 649     TypeImpl *target_type;
 650     TypeImpl *type;
 651
 652     if (!class) {
 653         return NULL;
 654     }
 655
 656     /* A simple fast path that can trigger a lot for leaf classes.  */
 657     type = class->type;
 658     if (type->name == typename) {
 659         return class;
 660     }
 661
 662     target_type = type_get_by_name(typename);
 663     if (!target_type) {
 664         /* target class type unknown, so fail the cast */
 665         return NULL;
 666     }
 667
 668     if (type->class->interfaces &&
 669             type_is_ancestor(target_type, type_interface)) {
 670         int found = 0;
 671         GSList *i;
 672
 673         for (i = class->interfaces; i; i = i->next) {
 674             ObjectClass *target_class = i->data;
 675
 676             if (type_is_ancestor(target_class->type, target_type)) {
 677                 ret = target_class;
 678                 found++;
 679             }
 680          }
 681
 682         /* The match was ambiguous, don't allow a cast */
 683         if (found > 1) {
 684             ret = NULL;
 685         }
 686     } else if (type_is_ancestor(type, target_type)) {
 687         ret = class;
 688     }
 689
 690     return ret;
 691 }
 692
 693 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 694                                               const char *typename,
 695                                               const char *file, int line,
 696                                               const char *func)
 697 {
 698     ObjectClass *ret;
 699
 700     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 701                                            typename, file, line, func);
 702
 703 #ifdef CONFIG_QOM_CAST_DEBUG
 704     int i;
 705
 706     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 707         if (class->class_cast_cache[i] == typename) {
 708             ret = class;
 709             goto out;
 710         }
 711     }
 712 #else
 713     if (!class || !class->interfaces) {
 714         return class;
 715     }
 716 #endif
 717
 718     ret = object_class_dynamic_cast(class, typename);
 719     if (!ret && class) {
 720         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 721                 file, line, func, class, typename);
 722         abort();
 723     }
 724
 725 #ifdef CONFIG_QOM_CAST_DEBUG
 726     if (class && ret == class) {
 727         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 728             class->class_cast_cache[i - 1] = class->class_cast_cache[i];
 729         }
 730         class->class_cast_cache[i - 1] = typename;
 731     }
 732 out:
 733 #endif
 734     return ret;
 735 }
 736
 737 const char *object_get_typename(Object *obj)
 738 {
 739     return obj->class->type->name;
 740 }
 741
 742 ObjectClass *object_get_class(Object *obj)
 743 {
 744     return obj->class;
 745 }
 746
 747 bool object_class_is_abstract(ObjectClass *klass)
 748 {
 749     return klass->type->abstract;
 750 }
 751
 752 const char *object_class_get_name(ObjectClass *klass)
 753 {
 754     return klass->type->name;
 755 }
 756
 757 ObjectClass *object_class_by_name(const char *typename)
 758 {
 759     TypeImpl *type = type_get_by_name(typename);
 760
 761     if (!type) {
 762         return NULL;
 763     }
 764
 765     type_initialize(type);
 766
 767     return type->class;
 768 }
 769
 770 ObjectClass *object_class_get_parent(ObjectClass *class)
 771 {
 772     TypeImpl *type = type_get_parent(class->type);
 773
 774     if (!type) {
 775         return NULL;
 776     }
 777
 778     type_initialize(type);
 779
 780     return type->class;
 781 }
 782
 783 typedef struct OCFData
 784 {
 785     void (*fn)(ObjectClass *klass, void *opaque);
 786     const char *implements_type;
 787     bool include_abstract;
 788     void *opaque;
 789 } OCFData;
 790
 791 static void object_class_foreach_tramp(gpointer key, gpointer value,
 792                                        gpointer opaque)
 793 {
 794     OCFData *data = opaque;
 795     TypeImpl *type = value;
 796     ObjectClass *k;
 797
 798     type_initialize(type);
 799     k = type->class;
 800
 801     if (!data->include_abstract && type->abstract) {
 802         return;
 803     }
 804
 805     if (data->implements_type &&
 806         !object_class_dynamic_cast(k, data->implements_type)) {
 807         return;
 808     }
 809
 810     data->fn(k, data->opaque);
 811 }
 812
 813 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 814                           const char *implements_type, bool include_abstract,
 815                           void *opaque)
 816 {
 817     OCFData data = { fn, implements_type, include_abstract, opaque };
 818
 819     enumerating_types = true;
 820     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 821     enumerating_types = false;
 822 }
 823
 824 static int do_object_child_foreach(Object *obj,
 825                                    int (*fn)(Object *child, void *opaque),
 826                                    void *opaque, bool recurse)
 827 {
 828     GHashTableIter iter;
 829     ObjectProperty *prop;
 830     int ret = 0;
 831
 832     g_hash_table_iter_init(&iter, obj->properties);
 833     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
 834         if (object_property_is_child(prop)) {
 835             Object *child = prop->opaque;
 836
 837             ret = fn(child, opaque);
 838             if (ret != 0) {
 839                 break;
 840             }
 841             if (recurse) {
 842                 do_object_child_foreach(child, fn, opaque, true);
 843             }
 844         }
 845     }
 846     return ret;
 847 }
 848
 849 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 850                          void *opaque)
 851 {
 852     return do_object_child_foreach(obj, fn, opaque, false);
 853 }
 854
 855 int object_child_foreach_recursive(Object *obj,
 856                                    int (*fn)(Object *child, void *opaque),
 857                                    void *opaque)
 858 {
 859     return do_object_child_foreach(obj, fn, opaque, true);
 860 }
 861
 862 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 863 {
 864     GSList **list = opaque;
 865
 866     *list = g_slist_prepend(*list, klass);
 867 }
 868
 869 GSList *object_class_get_list(const char *implements_type,
 870                               bool include_abstract)
 871 {
 872     GSList *list = NULL;
 873
 874     object_class_foreach(object_class_get_list_tramp,
 875                          implements_type, include_abstract, &list);
 876     return list;
 877 }
 878
 879 void object_ref(Object *obj)
 880 {
 881     if (!obj) {
 882         return;
 883     }
 884     atomic_inc(&obj->ref);
 885 }
 886
 887 void object_unref(Object *obj)
 888 {
 889     if (!obj) {
 890         return;
 891     }
 892     g_assert_cmpint(obj->ref, >, 0);
 893
 894     /* parent always holds a reference to its children */
 895     if (atomic_fetch_dec(&obj->ref) == 1) {
 896         object_finalize(obj);
 897     }
 898 }
 899
 900 ObjectProperty *
 901 object_property_add(Object *obj, const char *name, const char *type,
 902                     ObjectPropertyAccessor *get,
 903                     ObjectPropertyAccessor *set,
 904                     ObjectPropertyRelease *release,
 905                     void *opaque, Error **errp)
 906 {
 907     ObjectProperty *prop;
 908     size_t name_len = strlen(name);
 909
 910     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
 911         int i;
 912         ObjectProperty *ret;
 913         char *name_no_array = g_strdup(name);
 914
 915         name_no_array[name_len - 3] = '\0';
 916         for (i = 0; ; ++i) {
 917             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
 918
 919             ret = object_property_add(obj, full_name, type, get, set,
 920                                       release, opaque, NULL);
 921             g_free(full_name);
 922             if (ret) {
 923                 break;
 924             }
 925         }
 926         g_free(name_no_array);
 927         return ret;
 928     }
 929
 930     if (object_property_find(obj, name, NULL) != NULL) {
 931         error_setg(errp, "attempt to add duplicate property '%s'"
 932                    " to object (type '%s')", name,
 933                    object_get_typename(obj));
 934         return NULL;
 935     }
 936
 937     prop = g_malloc0(sizeof(*prop));
 938
 939     prop->name = g_strdup(name);
 940     prop->type = g_strdup(type);
 941
 942     prop->get = get;
 943     prop->set = set;
 944     prop->release = release;
 945     prop->opaque = opaque;
 946
 947     g_hash_table_insert(obj->properties, prop->name, prop);
 948     return prop;
 949 }
 950
 951 ObjectProperty *
 952 object_class_property_add(ObjectClass *klass,
 953                           const char *name,
 954                           const char *type,
 955                           ObjectPropertyAccessor *get,
 956                           ObjectPropertyAccessor *set,
 957                           ObjectPropertyRelease *release,
 958                           void *opaque,
 959                           Error **errp)
 960 {
 961     ObjectProperty *prop;
 962
 963     if (object_class_property_find(klass, name, NULL) != NULL) {
 964         error_setg(errp, "attempt to add duplicate property '%s'"
 965                    " to object (type '%s')", name,
 966                    object_class_get_name(klass));
 967         return NULL;
 968     }
 969
 970     prop = g_malloc0(sizeof(*prop));
 971
 972     prop->name = g_strdup(name);
 973     prop->type = g_strdup(type);
 974
 975     prop->get = get;
 976     prop->set = set;
 977     prop->release = release;
 978     prop->opaque = opaque;
 979
 980     g_hash_table_insert(klass->properties, g_strdup(name), prop);
 981
 982     return prop;
 983 }
 984
 985 ObjectProperty *object_property_find(Object *obj, const char *name,
 986                                      Error **errp)
 987 {
 988     ObjectProperty *prop;
 989     ObjectClass *klass = object_get_class(obj);
 990
 991     prop = object_class_property_find(klass, name, NULL);
 992     if (prop) {
 993         return prop;
 994     }
 995
 996     prop = g_hash_table_lookup(obj->properties, name);
 997     if (prop) {
 998         return prop;
 999     }
1000
1001     error_setg(errp, "Property '.%s' not found", name);
1002     return NULL;
1003 }
1004
1005 void object_property_iter_init(ObjectPropertyIterator *iter,
1006                                Object *obj)
1007 {
1008     g_hash_table_iter_init(&iter->iter, obj->properties);
1009     iter->nextclass = object_get_class(obj);
1010 }
1011
1012 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1013 {
1014     gpointer key, val;
1015     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1016         if (!iter->nextclass) {
1017             return NULL;
1018         }
1019         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1020         iter->nextclass = object_class_get_parent(iter->nextclass);
1021     }
1022     return val;
1023 }
1024
1025 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1026                                            Error **errp)
1027 {
1028     ObjectProperty *prop;
1029     ObjectClass *parent_klass;
1030
1031     parent_klass = object_class_get_parent(klass);
1032     if (parent_klass) {
1033         prop = object_class_property_find(parent_klass, name, NULL);
1034         if (prop) {
1035             return prop;
1036         }
1037     }
1038
1039     prop = g_hash_table_lookup(klass->properties, name);
1040     if (!prop) {
1041         error_setg(errp, "Property '.%s' not found", name);
1042     }
1043     return prop;
1044 }
1045
1046 void object_property_del(Object *obj, const char *name, Error **errp)
1047 {
1048     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1049
1050     if (!prop) {
1051         error_setg(errp, "Property '.%s' not found", name);
1052         return;
1053     }
1054
1055     if (prop->release) {
1056         prop->release(obj, name, prop->opaque);
1057     }
1058     g_hash_table_remove(obj->properties, name);
1059 }
1060
1061 void object_property_get(Object *obj, Visitor *v, const char *name,
1062                          Error **errp)
1063 {
1064     ObjectProperty *prop = object_property_find(obj, name, errp);
1065     if (prop == NULL) {
1066         return;
1067     }
1068
1069     if (!prop->get) {
1070         error_setg(errp, QERR_PERMISSION_DENIED);
1071     } else {
1072         prop->get(obj, v, name, prop->opaque, errp);
1073     }
1074 }
1075
1076 void object_property_set(Object *obj, Visitor *v, const char *name,
1077                          Error **errp)
1078 {
1079     ObjectProperty *prop = object_property_find(obj, name, errp);
1080     if (prop == NULL) {
1081         return;
1082     }
1083
1084     if (!prop->set) {
1085         error_setg(errp, QERR_PERMISSION_DENIED);
1086     } else {
1087         prop->set(obj, v, name, prop->opaque, errp);
1088     }
1089 }
1090
1091 void object_property_set_str(Object *obj, const char *value,
1092                              const char *name, Error **errp)
1093 {
1094     QString *qstr = qstring_from_str(value);
1095     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1096
1097     QDECREF(qstr);
1098 }
1099
1100 char *object_property_get_str(Object *obj, const char *name,
1101                               Error **errp)
1102 {
1103     QObject *ret = object_property_get_qobject(obj, name, errp);
1104     QString *qstring;
1105     char *retval;
1106
1107     if (!ret) {
1108         return NULL;
1109     }
1110     qstring = qobject_to_qstring(ret);
1111     if (!qstring) {
1112         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1113         retval = NULL;
1114     } else {
1115         retval = g_strdup(qstring_get_str(qstring));
1116     }
1117
1118     QDECREF(qstring);
1119     return retval;
1120 }
1121
1122 void object_property_set_link(Object *obj, Object *value,
1123                               const char *name, Error **errp)
1124 {
1125     if (value) {
1126         gchar *path = object_get_canonical_path(value);
1127         object_property_set_str(obj, path, name, errp);
1128         g_free(path);
1129     } else {
1130         object_property_set_str(obj, "", name, errp);
1131     }
1132 }
1133
1134 Object *object_property_get_link(Object *obj, const char *name,
1135                                  Error **errp)
1136 {
1137     char *str = object_property_get_str(obj, name, errp);
1138     Object *target = NULL;
1139
1140     if (str && *str) {
1141         target = object_resolve_path(str, NULL);
1142         if (!target) {
1143             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1144                       "Device '%s' not found", str);
1145         }
1146     }
1147
1148     g_free(str);
1149     return target;
1150 }
1151
1152 void object_property_set_bool(Object *obj, bool value,
1153                               const char *name, Error **errp)
1154 {
1155     QBool *qbool = qbool_from_bool(value);
1156     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1157
1158     QDECREF(qbool);
1159 }
1160
1161 bool object_property_get_bool(Object *obj, const char *name,
1162                               Error **errp)
1163 {
1164     QObject *ret = object_property_get_qobject(obj, name, errp);
1165     QBool *qbool;
1166     bool retval;
1167
1168     if (!ret) {
1169         return false;
1170     }
1171     qbool = qobject_to_qbool(ret);
1172     if (!qbool) {
1173         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1174         retval = false;
1175     } else {
1176         retval = qbool_get_bool(qbool);
1177     }
1178
1179     QDECREF(qbool);
1180     return retval;
1181 }
1182
1183 void object_property_set_int(Object *obj, int64_t value,
1184                              const char *name, Error **errp)
1185 {
1186     QInt *qint = qint_from_int(value);
1187     object_property_set_qobject(obj, QOBJECT(qint), name, errp);
1188
1189     QDECREF(qint);
1190 }
1191
1192 int64_t object_property_get_int(Object *obj, const char *name,
1193                                 Error **errp)
1194 {
1195     QObject *ret = object_property_get_qobject(obj, name, errp);
1196     QInt *qint;
1197     int64_t retval;
1198
1199     if (!ret) {
1200         return -1;
1201     }
1202     qint = qobject_to_qint(ret);
1203     if (!qint) {
1204         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1205         retval = -1;
1206     } else {
1207         retval = qint_get_int(qint);
1208     }
1209
1210     QDECREF(qint);
1211     return retval;
1212 }
1213
1214 typedef struct EnumProperty {
1215     const char * const *strings;
1216     int (*get)(Object *, Error **);
1217     void (*set)(Object *, int, Error **);
1218 } EnumProperty;
1219
1220 int object_property_get_enum(Object *obj, const char *name,
1221                              const char *typename, Error **errp)
1222 {
1223     Error *err = NULL;
1224     StringOutputVisitor *sov;
1225     Visitor *v;
1226     char *str;
1227     int ret;
1228     ObjectProperty *prop = object_property_find(obj, name, errp);
1229     EnumProperty *enumprop;
1230
1231     if (prop == NULL) {
1232         return 0;
1233     }
1234
1235     if (!g_str_equal(prop->type, typename)) {
1236         error_setg(errp, "Property %s on %s is not '%s' enum type",
1237                    name, object_class_get_name(
1238                        object_get_class(obj)), typename);
1239         return 0;
1240     }
1241
1242     enumprop = prop->opaque;
1243
1244     sov = string_output_visitor_new(false);
1245     v = string_output_get_visitor(sov);
1246     object_property_get(obj, v, name, &err);
1247     if (err) {
1248         error_propagate(errp, err);
1249         visit_free(v);
1250         return 0;
1251     }
1252     str = string_output_get_string(sov);
1253     visit_free(v);
1254     v = string_input_visitor_new(str);
1255     visit_type_enum(v, name, &ret, enumprop->strings, errp);
1256
1257     g_free(str);
1258     visit_free(v);
1259
1260     return ret;
1261 }
1262
1263 void object_property_get_uint16List(Object *obj, const char *name,
1264                                     uint16List **list, Error **errp)
1265 {
1266     Error *err = NULL;
1267     StringOutputVisitor *ov;
1268     Visitor *v;
1269     char *str;
1270
1271     ov = string_output_visitor_new(false);
1272     object_property_get(obj, string_output_get_visitor(ov),
1273                         name, &err);
1274     if (err) {
1275         error_propagate(errp, err);
1276         goto out;
1277     }
1278     str = string_output_get_string(ov);
1279     v = string_input_visitor_new(str);
1280     visit_type_uint16List(v, NULL, list, errp);
1281
1282     g_free(str);
1283     visit_free(v);
1284 out:
1285     visit_free(string_output_get_visitor(ov));
1286 }
1287
1288 void object_property_parse(Object *obj, const char *string,
1289                            const char *name, Error **errp)
1290 {
1291     Visitor *v = string_input_visitor_new(string);
1292     object_property_set(obj, v, name, errp);
1293     visit_free(v);
1294 }
1295
1296 char *object_property_print(Object *obj, const char *name, bool human,
1297                             Error **errp)
1298 {
1299     StringOutputVisitor *sov;
1300     char *string = NULL;
1301     Error *local_err = NULL;
1302
1303     sov = string_output_visitor_new(human);
1304     object_property_get(obj, string_output_get_visitor(sov), name, &local_err);
1305     if (local_err) {
1306         error_propagate(errp, local_err);
1307         goto out;
1308     }
1309
1310     string = string_output_get_string(sov);
1311
1312 out:
1313     visit_free(string_output_get_visitor(sov));
1314     return string;
1315 }
1316
1317 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1318 {
1319     ObjectProperty *prop = object_property_find(obj, name, errp);
1320     if (prop == NULL) {
1321         return NULL;
1322     }
1323
1324     return prop->type;
1325 }
1326
1327 Object *object_get_root(void)
1328 {
1329     static Object *root;
1330
1331     if (!root) {
1332         root = object_new("container");
1333     }
1334
1335     return root;
1336 }
1337
1338 Object *object_get_objects_root(void)
1339 {
1340     return container_get(object_get_root(), "/objects");
1341 }
1342
1343 static void object_get_child_property(Object *obj, Visitor *v,
1344                                       const char *name, void *opaque,
1345                                       Error **errp)
1346 {
1347     Object *child = opaque;
1348     gchar *path;
1349
1350     path = object_get_canonical_path(child);
1351     visit_type_str(v, name, &path, errp);
1352     g_free(path);
1353 }
1354
1355 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1356 {
1357     return opaque;
1358 }
1359
1360 static void object_finalize_child_property(Object *obj, const char *name,
1361                                            void *opaque)
1362 {
1363     Object *child = opaque;
1364
1365     if (child->class->unparent) {
1366         (child->class->unparent)(child);
1367     }
1368     child->parent = NULL;
1369     object_unref(child);
1370 }
1371
1372 void object_property_add_child(Object *obj, const char *name,
1373                                Object *child, Error **errp)
1374 {
1375     Error *local_err = NULL;
1376     gchar *type;
1377     ObjectProperty *op;
1378
1379     if (child->parent != NULL) {
1380         error_setg(errp, "child object is already parented");
1381         return;
1382     }
1383
1384     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1385
1386     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1387                              object_finalize_child_property, child, &local_err);
1388     if (local_err) {
1389         error_propagate(errp, local_err);
1390         goto out;
1391     }
1392
1393     op->resolve = object_resolve_child_property;
1394     object_ref(child);
1395     child->parent = obj;
1396
1397 out:
1398     g_free(type);
1399 }
1400
1401 void object_property_allow_set_link(Object *obj, const char *name,
1402                                     Object *val, Error **errp)
1403 {
1404     /* Allow the link to be set, always */
1405 }
1406
1407 typedef struct {
1408     Object **child;
1409     void (*check)(Object *, const char *, Object *, Error **);
1410     ObjectPropertyLinkFlags flags;
1411 } LinkProperty;
1412
1413 static void object_get_link_property(Object *obj, Visitor *v,
1414                                      const char *name, void *opaque,
1415                                      Error **errp)
1416 {
1417     LinkProperty *lprop = opaque;
1418     Object **child = lprop->child;
1419     gchar *path;
1420
1421     if (*child) {
1422         path = object_get_canonical_path(*child);
1423         visit_type_str(v, name, &path, errp);
1424         g_free(path);
1425     } else {
1426         path = (gchar *)"";
1427         visit_type_str(v, name, &path, errp);
1428     }
1429 }
1430
1431 /*
1432  * object_resolve_link:
1433  *
1434  * Lookup an object and ensure its type matches the link property type.  This
1435  * is similar to object_resolve_path() except type verification against the
1436  * link property is performed.
1437  *
1438  * Returns: The matched object or NULL on path lookup failures.
1439  */
1440 static Object *object_resolve_link(Object *obj, const char *name,
1441                                    const char *path, Error **errp)
1442 {
1443     const char *type;
1444     gchar *target_type;
1445     bool ambiguous = false;
1446     Object *target;
1447
1448     /* Go from link<FOO> to FOO.  */
1449     type = object_property_get_type(obj, name, NULL);
1450     target_type = g_strndup(&type[5], strlen(type) - 6);
1451     target = object_resolve_path_type(path, target_type, &ambiguous);
1452
1453     if (ambiguous) {
1454         error_setg(errp, "Path '%s' does not uniquely identify an object",
1455                    path);
1456     } else if (!target) {
1457         target = object_resolve_path(path, &ambiguous);
1458         if (target || ambiguous) {
1459             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1460         } else {
1461             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1462                       "Device '%s' not found", path);
1463         }
1464         target = NULL;
1465     }
1466     g_free(target_type);
1467
1468     return target;
1469 }
1470
1471 static void object_set_link_property(Object *obj, Visitor *v,
1472                                      const char *name, void *opaque,
1473                                      Error **errp)
1474 {
1475     Error *local_err = NULL;
1476     LinkProperty *prop = opaque;
1477     Object **child = prop->child;
1478     Object *old_target = *child;
1479     Object *new_target = NULL;
1480     char *path = NULL;
1481
1482     visit_type_str(v, name, &path, &local_err);
1483
1484     if (!local_err && strcmp(path, "") != 0) {
1485         new_target = object_resolve_link(obj, name, path, &local_err);
1486     }
1487
1488     g_free(path);
1489     if (local_err) {
1490         error_propagate(errp, local_err);
1491         return;
1492     }
1493
1494     prop->check(obj, name, new_target, &local_err);
1495     if (local_err) {
1496         error_propagate(errp, local_err);
1497         return;
1498     }
1499
1500     object_ref(new_target);
1501     *child = new_target;
1502     object_unref(old_target);
1503 }
1504
1505 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1506 {
1507     LinkProperty *lprop = opaque;
1508
1509     return *lprop->child;
1510 }
1511
1512 static void object_release_link_property(Object *obj, const char *name,
1513                                          void *opaque)
1514 {
1515     LinkProperty *prop = opaque;
1516
1517     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1518         object_unref(*prop->child);
1519     }
1520     g_free(prop);
1521 }
1522
1523 void object_property_add_link(Object *obj, const char *name,
1524                               const char *type, Object **child,
1525                               void (*check)(Object *, const char *,
1526                                             Object *, Error **),
1527                               ObjectPropertyLinkFlags flags,
1528                               Error **errp)
1529 {
1530     Error *local_err = NULL;
1531     LinkProperty *prop = g_malloc(sizeof(*prop));
1532     gchar *full_type;
1533     ObjectProperty *op;
1534
1535     prop->child = child;
1536     prop->check = check;
1537     prop->flags = flags;
1538
1539     full_type = g_strdup_printf("link<%s>", type);
1540
1541     op = object_property_add(obj, name, full_type,
1542                              object_get_link_property,
1543                              check ? object_set_link_property : NULL,
1544                              object_release_link_property,
1545                              prop,
1546                              &local_err);
1547     if (local_err) {
1548         error_propagate(errp, local_err);
1549         g_free(prop);
1550         goto out;
1551     }
1552
1553     op->resolve = object_resolve_link_property;
1554
1555 out:
1556     g_free(full_type);
1557 }
1558
1559 void object_property_add_const_link(Object *obj, const char *name,
1560                                     Object *target, Error **errp)
1561 {
1562     char *link_type;
1563     ObjectProperty *op;
1564
1565     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1566     op = object_property_add(obj, name, link_type,
1567                              object_get_child_property, NULL,
1568                              NULL, target, errp);
1569     if (op != NULL) {
1570         op->resolve = object_resolve_child_property;
1571     }
1572     g_free(link_type);
1573 }
1574
1575 gchar *object_get_canonical_path_component(Object *obj)
1576 {
1577     ObjectProperty *prop = NULL;
1578     GHashTableIter iter;
1579
1580     g_assert(obj);
1581     g_assert(obj->parent != NULL);
1582
1583     g_hash_table_iter_init(&iter, obj->parent->properties);
1584     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1585         if (!object_property_is_child(prop)) {
1586             continue;
1587         }
1588
1589         if (prop->opaque == obj) {
1590             return g_strdup(prop->name);
1591         }
1592     }
1593
1594     /* obj had a parent but was not a child, should never happen */
1595     g_assert_not_reached();
1596     return NULL;
1597 }
1598
1599 gchar *object_get_canonical_path(Object *obj)
1600 {
1601     Object *root = object_get_root();
1602     char *newpath, *path = NULL;
1603
1604     while (obj != root) {
1605         char *component = object_get_canonical_path_component(obj);
1606
1607         if (path) {
1608             newpath = g_strdup_printf("%s/%s", component, path);
1609             g_free(component);
1610             g_free(path);
1611             path = newpath;
1612         } else {
1613             path = component;
1614         }
1615
1616         obj = obj->parent;
1617     }
1618
1619     newpath = g_strdup_printf("/%s", path ? path : "");
1620     g_free(path);
1621
1622     return newpath;
1623 }
1624
1625 Object *object_resolve_path_component(Object *parent, const gchar *part)
1626 {
1627     ObjectProperty *prop = object_property_find(parent, part, NULL);
1628     if (prop == NULL) {
1629         return NULL;
1630     }
1631
1632     if (prop->resolve) {
1633         return prop->resolve(parent, prop->opaque, part);
1634     } else {
1635         return NULL;
1636     }
1637 }
1638
1639 static Object *object_resolve_abs_path(Object *parent,
1640                                           gchar **parts,
1641                                           const char *typename,
1642                                           int index)
1643 {
1644     Object *child;
1645
1646     if (parts[index] == NULL) {
1647         return object_dynamic_cast(parent, typename);
1648     }
1649
1650     if (strcmp(parts[index], "") == 0) {
1651         return object_resolve_abs_path(parent, parts, typename, index + 1);
1652     }
1653
1654     child = object_resolve_path_component(parent, parts[index]);
1655     if (!child) {
1656         return NULL;
1657     }
1658
1659     return object_resolve_abs_path(child, parts, typename, index + 1);
1660 }
1661
1662 static Object *object_resolve_partial_path(Object *parent,
1663                                               gchar **parts,
1664                                               const char *typename,
1665                                               bool *ambiguous)
1666 {
1667     Object *obj;
1668     GHashTableIter iter;
1669     ObjectProperty *prop;
1670
1671     obj = object_resolve_abs_path(parent, parts, typename, 0);
1672
1673     g_hash_table_iter_init(&iter, parent->properties);
1674     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1675         Object *found;
1676
1677         if (!object_property_is_child(prop)) {
1678             continue;
1679         }
1680
1681         found = object_resolve_partial_path(prop->opaque, parts,
1682                                             typename, ambiguous);
1683         if (found) {
1684             if (obj) {
1685                 if (ambiguous) {
1686                     *ambiguous = true;
1687                 }
1688                 return NULL;
1689             }
1690             obj = found;
1691         }
1692
1693         if (ambiguous && *ambiguous) {
1694             return NULL;
1695         }
1696     }
1697
1698     return obj;
1699 }
1700
1701 Object *object_resolve_path_type(const char *path, const char *typename,
1702                                  bool *ambiguous)
1703 {
1704     Object *obj;
1705     gchar **parts;
1706
1707     parts = g_strsplit(path, "/", 0);
1708     assert(parts);
1709
1710     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1711         if (ambiguous) {
1712             *ambiguous = false;
1713         }
1714         obj = object_resolve_partial_path(object_get_root(), parts,
1715                                           typename, ambiguous);
1716     } else {
1717         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1718     }
1719
1720     g_strfreev(parts);
1721
1722     return obj;
1723 }
1724
1725 Object *object_resolve_path(const char *path, bool *ambiguous)
1726 {
1727     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1728 }
1729
1730 typedef struct StringProperty
1731 {
1732     char *(*get)(Object *, Error **);
1733     void (*set)(Object *, const char *, Error **);
1734 } StringProperty;
1735
1736 static void property_get_str(Object *obj, Visitor *v, const char *name,
1737                              void *opaque, Error **errp)
1738 {
1739     StringProperty *prop = opaque;
1740     char *value;
1741     Error *err = NULL;
1742
1743     value = prop->get(obj, &err);
1744     if (err) {
1745         error_propagate(errp, err);
1746         return;
1747     }
1748
1749     visit_type_str(v, name, &value, errp);
1750     g_free(value);
1751 }
1752
1753 static void property_set_str(Object *obj, Visitor *v, const char *name,
1754                              void *opaque, Error **errp)
1755 {
1756     StringProperty *prop = opaque;
1757     char *value;
1758     Error *local_err = NULL;
1759
1760     visit_type_str(v, name, &value, &local_err);
1761     if (local_err) {
1762         error_propagate(errp, local_err);
1763         return;
1764     }
1765
1766     prop->set(obj, value, errp);
1767     g_free(value);
1768 }
1769
1770 static void property_release_str(Object *obj, const char *name,
1771                                  void *opaque)
1772 {
1773     StringProperty *prop = opaque;
1774     g_free(prop);
1775 }
1776
1777 void object_property_add_str(Object *obj, const char *name,
1778                            char *(*get)(Object *, Error **),
1779                            void (*set)(Object *, const char *, Error **),
1780                            Error **errp)
1781 {
1782     Error *local_err = NULL;
1783     StringProperty *prop = g_malloc0(sizeof(*prop));
1784
1785     prop->get = get;
1786     prop->set = set;
1787
1788     object_property_add(obj, name, "string",
1789                         get ? property_get_str : NULL,
1790                         set ? property_set_str : NULL,
1791                         property_release_str,
1792                         prop, &local_err);
1793     if (local_err) {
1794         error_propagate(errp, local_err);
1795         g_free(prop);
1796     }
1797 }
1798
1799 void object_class_property_add_str(ObjectClass *klass, const char *name,
1800                                    char *(*get)(Object *, Error **),
1801                                    void (*set)(Object *, const char *,
1802                                                Error **),
1803                                    Error **errp)
1804 {
1805     Error *local_err = NULL;
1806     StringProperty *prop = g_malloc0(sizeof(*prop));
1807
1808     prop->get = get;
1809     prop->set = set;
1810
1811     object_class_property_add(klass, name, "string",
1812                               get ? property_get_str : NULL,
1813                               set ? property_set_str : NULL,
1814                               property_release_str,
1815                               prop, &local_err);
1816     if (local_err) {
1817         error_propagate(errp, local_err);
1818         g_free(prop);
1819     }
1820 }
1821
1822 typedef struct BoolProperty
1823 {
1824     bool (*get)(Object *, Error **);
1825     void (*set)(Object *, bool, Error **);
1826 } BoolProperty;
1827
1828 static void property_get_bool(Object *obj, Visitor *v, const char *name,
1829                               void *opaque, Error **errp)
1830 {
1831     BoolProperty *prop = opaque;
1832     bool value;
1833     Error *err = NULL;
1834
1835     value = prop->get(obj, &err);
1836     if (err) {
1837         error_propagate(errp, err);
1838         return;
1839     }
1840
1841     visit_type_bool(v, name, &value, errp);
1842 }
1843
1844 static void property_set_bool(Object *obj, Visitor *v, const char *name,
1845                               void *opaque, Error **errp)
1846 {
1847     BoolProperty *prop = opaque;
1848     bool value;
1849     Error *local_err = NULL;
1850
1851     visit_type_bool(v, name, &value, &local_err);
1852     if (local_err) {
1853         error_propagate(errp, local_err);
1854         return;
1855     }
1856
1857     prop->set(obj, value, errp);
1858 }
1859
1860 static void property_release_bool(Object *obj, const char *name,
1861                                   void *opaque)
1862 {
1863     BoolProperty *prop = opaque;
1864     g_free(prop);
1865 }
1866
1867 void object_property_add_bool(Object *obj, const char *name,
1868                               bool (*get)(Object *, Error **),
1869                               void (*set)(Object *, bool, Error **),
1870                               Error **errp)
1871 {
1872     Error *local_err = NULL;
1873     BoolProperty *prop = g_malloc0(sizeof(*prop));
1874
1875     prop->get = get;
1876     prop->set = set;
1877
1878     object_property_add(obj, name, "bool",
1879                         get ? property_get_bool : NULL,
1880                         set ? property_set_bool : NULL,
1881                         property_release_bool,
1882                         prop, &local_err);
1883     if (local_err) {
1884         error_propagate(errp, local_err);
1885         g_free(prop);
1886     }
1887 }
1888
1889 void object_class_property_add_bool(ObjectClass *klass, const char *name,
1890                                     bool (*get)(Object *, Error **),
1891                                     void (*set)(Object *, bool, Error **),
1892                                     Error **errp)
1893 {
1894     Error *local_err = NULL;
1895     BoolProperty *prop = g_malloc0(sizeof(*prop));
1896
1897     prop->get = get;
1898     prop->set = set;
1899
1900     object_class_property_add(klass, name, "bool",
1901                               get ? property_get_bool : NULL,
1902                               set ? property_set_bool : NULL,
1903                               property_release_bool,
1904                               prop, &local_err);
1905     if (local_err) {
1906         error_propagate(errp, local_err);
1907         g_free(prop);
1908     }
1909 }
1910
1911 static void property_get_enum(Object *obj, Visitor *v, const char *name,
1912                               void *opaque, Error **errp)
1913 {
1914     EnumProperty *prop = opaque;
1915     int value;
1916     Error *err = NULL;
1917
1918     value = prop->get(obj, &err);
1919     if (err) {
1920         error_propagate(errp, err);
1921         return;
1922     }
1923
1924     visit_type_enum(v, name, &value, prop->strings, errp);
1925 }
1926
1927 static void property_set_enum(Object *obj, Visitor *v, const char *name,
1928                               void *opaque, Error **errp)
1929 {
1930     EnumProperty *prop = opaque;
1931     int value;
1932     Error *err = NULL;
1933
1934     visit_type_enum(v, name, &value, prop->strings, &err);
1935     if (err) {
1936         error_propagate(errp, err);
1937         return;
1938     }
1939     prop->set(obj, value, errp);
1940 }
1941
1942 static void property_release_enum(Object *obj, const char *name,
1943                                   void *opaque)
1944 {
1945     EnumProperty *prop = opaque;
1946     g_free(prop);
1947 }
1948
1949 void object_property_add_enum(Object *obj, const char *name,
1950                               const char *typename,
1951                               const char * const *strings,
1952                               int (*get)(Object *, Error **),
1953                               void (*set)(Object *, int, Error **),
1954                               Error **errp)
1955 {
1956     Error *local_err = NULL;
1957     EnumProperty *prop = g_malloc(sizeof(*prop));
1958
1959     prop->strings = strings;
1960     prop->get = get;
1961     prop->set = set;
1962
1963     object_property_add(obj, name, typename,
1964                         get ? property_get_enum : NULL,
1965                         set ? property_set_enum : NULL,
1966                         property_release_enum,
1967                         prop, &local_err);
1968     if (local_err) {
1969         error_propagate(errp, local_err);
1970         g_free(prop);
1971     }
1972 }
1973
1974 void object_class_property_add_enum(ObjectClass *klass, const char *name,
1975                                     const char *typename,
1976                                     const char * const *strings,
1977                                     int (*get)(Object *, Error **),
1978                                     void (*set)(Object *, int, Error **),
1979                                     Error **errp)
1980 {
1981     Error *local_err = NULL;
1982     EnumProperty *prop = g_malloc(sizeof(*prop));
1983
1984     prop->strings = strings;
1985     prop->get = get;
1986     prop->set = set;
1987
1988     object_class_property_add(klass, name, typename,
1989                               get ? property_get_enum : NULL,
1990                               set ? property_set_enum : NULL,
1991                               property_release_enum,
1992                               prop, &local_err);
1993     if (local_err) {
1994         error_propagate(errp, local_err);
1995         g_free(prop);
1996     }
1997 }
1998
1999 typedef struct TMProperty {
2000     void (*get)(Object *, struct tm *, Error **);
2001 } TMProperty;
2002
2003 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2004                             void *opaque, Error **errp)
2005 {
2006     TMProperty *prop = opaque;
2007     Error *err = NULL;
2008     struct tm value;
2009
2010     prop->get(obj, &value, &err);
2011     if (err) {
2012         goto out;
2013     }
2014
2015     visit_start_struct(v, name, NULL, 0, &err);
2016     if (err) {
2017         goto out;
2018     }
2019     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2020     if (err) {
2021         goto out_end;
2022     }
2023     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2024     if (err) {
2025         goto out_end;
2026     }
2027     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2028     if (err) {
2029         goto out_end;
2030     }
2031     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2032     if (err) {
2033         goto out_end;
2034     }
2035     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2036     if (err) {
2037         goto out_end;
2038     }
2039     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2040     if (err) {
2041         goto out_end;
2042     }
2043     visit_check_struct(v, &err);
2044 out_end:
2045     visit_end_struct(v, NULL);
2046 out:
2047     error_propagate(errp, err);
2048
2049 }
2050
2051 static void property_release_tm(Object *obj, const char *name,
2052                                 void *opaque)
2053 {
2054     TMProperty *prop = opaque;
2055     g_free(prop);
2056 }
2057
2058 void object_property_add_tm(Object *obj, const char *name,
2059                             void (*get)(Object *, struct tm *, Error **),
2060                             Error **errp)
2061 {
2062     Error *local_err = NULL;
2063     TMProperty *prop = g_malloc0(sizeof(*prop));
2064
2065     prop->get = get;
2066
2067     object_property_add(obj, name, "struct tm",
2068                         get ? property_get_tm : NULL, NULL,
2069                         property_release_tm,
2070                         prop, &local_err);
2071     if (local_err) {
2072         error_propagate(errp, local_err);
2073         g_free(prop);
2074     }
2075 }
2076
2077 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2078                                   void (*get)(Object *, struct tm *, Error **),
2079                                   Error **errp)
2080 {
2081     Error *local_err = NULL;
2082     TMProperty *prop = g_malloc0(sizeof(*prop));
2083
2084     prop->get = get;
2085
2086     object_class_property_add(klass, name, "struct tm",
2087                               get ? property_get_tm : NULL, NULL,
2088                               property_release_tm,
2089                               prop, &local_err);
2090     if (local_err) {
2091         error_propagate(errp, local_err);
2092         g_free(prop);
2093     }
2094 }
2095
2096 static char *qdev_get_type(Object *obj, Error **errp)
2097 {
2098     return g_strdup(object_get_typename(obj));
2099 }
2100
2101 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2102                                    void *opaque, Error **errp)
2103 {
2104     uint8_t value = *(uint8_t *)opaque;
2105     visit_type_uint8(v, name, &value, errp);
2106 }
2107
2108 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2109                                     void *opaque, Error **errp)
2110 {
2111     uint16_t value = *(uint16_t *)opaque;
2112     visit_type_uint16(v, name, &value, errp);
2113 }
2114
2115 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2116                                     void *opaque, Error **errp)
2117 {
2118     uint32_t value = *(uint32_t *)opaque;
2119     visit_type_uint32(v, name, &value, errp);
2120 }
2121
2122 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2123                                     void *opaque, Error **errp)
2124 {
2125     uint64_t value = *(uint64_t *)opaque;
2126     visit_type_uint64(v, name, &value, errp);
2127 }
2128
2129 void object_property_add_uint8_ptr(Object *obj, const char *name,
2130                                    const uint8_t *v, Error **errp)
2131 {
2132     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2133                         NULL, NULL, (void *)v, errp);
2134 }
2135
2136 void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2137                                          const uint8_t *v, Error **errp)
2138 {
2139     object_class_property_add(klass, name, "uint8", property_get_uint8_ptr,
2140                               NULL, NULL, (void *)v, errp);
2141 }
2142
2143 void object_property_add_uint16_ptr(Object *obj, const char *name,
2144                                     const uint16_t *v, Error **errp)
2145 {
2146     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2147                         NULL, NULL, (void *)v, errp);
2148 }
2149
2150 void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2151                                           const uint16_t *v, Error **errp)
2152 {
2153     object_class_property_add(klass, name, "uint16", property_get_uint16_ptr,
2154                               NULL, NULL, (void *)v, errp);
2155 }
2156
2157 void object_property_add_uint32_ptr(Object *obj, const char *name,
2158                                     const uint32_t *v, Error **errp)
2159 {
2160     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2161                         NULL, NULL, (void *)v, errp);
2162 }
2163
2164 void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2165                                           const uint32_t *v, Error **errp)
2166 {
2167     object_class_property_add(klass, name, "uint32", property_get_uint32_ptr,
2168                               NULL, NULL, (void *)v, errp);
2169 }
2170
2171 void object_property_add_uint64_ptr(Object *obj, const char *name,
2172                                     const uint64_t *v, Error **errp)
2173 {
2174     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2175                         NULL, NULL, (void *)v, errp);
2176 }
2177
2178 void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2179                                           const uint64_t *v, Error **errp)
2180 {
2181     object_class_property_add(klass, name, "uint64", property_get_uint64_ptr,
2182                               NULL, NULL, (void *)v, errp);
2183 }
2184
2185 typedef struct {
2186     Object *target_obj;
2187     char *target_name;
2188 } AliasProperty;
2189
2190 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2191                                void *opaque, Error **errp)
2192 {
2193     AliasProperty *prop = opaque;
2194
2195     object_property_get(prop->target_obj, v, prop->target_name, errp);
2196 }
2197
2198 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2199                                void *opaque, Error **errp)
2200 {
2201     AliasProperty *prop = opaque;
2202
2203     object_property_set(prop->target_obj, v, prop->target_name, errp);
2204 }
2205
2206 static Object *property_resolve_alias(Object *obj, void *opaque,
2207                                       const gchar *part)
2208 {
2209     AliasProperty *prop = opaque;
2210
2211     return object_resolve_path_component(prop->target_obj, prop->target_name);
2212 }
2213
2214 static void property_release_alias(Object *obj, const char *name, void *opaque)
2215 {
2216     AliasProperty *prop = opaque;
2217
2218     g_free(prop->target_name);
2219     g_free(prop);
2220 }
2221
2222 void object_property_add_alias(Object *obj, const char *name,
2223                                Object *target_obj, const char *target_name,
2224                                Error **errp)
2225 {
2226     AliasProperty *prop;
2227     ObjectProperty *op;
2228     ObjectProperty *target_prop;
2229     gchar *prop_type;
2230     Error *local_err = NULL;
2231
2232     target_prop = object_property_find(target_obj, target_name, errp);
2233     if (!target_prop) {
2234         return;
2235     }
2236
2237     if (object_property_is_child(target_prop)) {
2238         prop_type = g_strdup_printf("link%s",
2239                                     target_prop->type + strlen("child"));
2240     } else {
2241         prop_type = g_strdup(target_prop->type);
2242     }
2243
2244     prop = g_malloc(sizeof(*prop));
2245     prop->target_obj = target_obj;
2246     prop->target_name = g_strdup(target_name);
2247
2248     op = object_property_add(obj, name, prop_type,
2249                              property_get_alias,
2250                              property_set_alias,
2251                              property_release_alias,
2252                              prop, &local_err);
2253     if (local_err) {
2254         error_propagate(errp, local_err);
2255         g_free(prop);
2256         goto out;
2257     }
2258     op->resolve = property_resolve_alias;
2259
2260     object_property_set_description(obj, op->name,
2261                                     target_prop->description,
2262                                     &error_abort);
2263
2264 out:
2265     g_free(prop_type);
2266 }
2267
2268 void object_property_set_description(Object *obj, const char *name,
2269                                      const char *description, Error **errp)
2270 {
2271     ObjectProperty *op;
2272
2273     op = object_property_find(obj, name, errp);
2274     if (!op) {
2275         return;
2276     }
2277
2278     g_free(op->description);
2279     op->description = g_strdup(description);
2280 }
2281
2282 void object_class_property_set_description(ObjectClass *klass,
2283                                            const char *name,
2284                                            const char *description,
2285                                            Error **errp)
2286 {
2287     ObjectProperty *op;
2288
2289     op = g_hash_table_lookup(klass->properties, name);
2290     if (!op) {
2291         error_setg(errp, "Property '.%s' not found", name);
2292         return;
2293     }
2294
2295     g_free(op->description);
2296     op->description = g_strdup(description);
2297 }
2298
2299 static void object_instance_init(Object *obj)
2300 {
2301     object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
2302 }
2303
2304 static void register_types(void)
2305 {
2306     static TypeInfo interface_info = {
2307         .name = TYPE_INTERFACE,
2308         .class_size = sizeof(InterfaceClass),
2309         .abstract = true,
2310     };
2311
2312     static TypeInfo object_info = {
2313         .name = TYPE_OBJECT,
2314         .instance_size = sizeof(Object),
2315         .instance_init = object_instance_init,
2316         .abstract = true,
2317     };
2318
2319     type_interface = type_register_internal(&interface_info);
2320     type_register_internal(&object_info);
2321 }
2322
2323 type_init(register_types)