qom/object.c

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