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