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, prop->opaque, name, 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, prop->opaque, name, 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, NULL, 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, void *opaque,
1339                                       const char *name, Error **errp)
1340 {
1341     Object *child = opaque;
1342     gchar *path;
1343
1344     path = object_get_canonical_path(child);
1345     visit_type_str(v, name, &path, errp);
1346     g_free(path);
1347 }
1348
1349 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1350 {
1351     return opaque;
1352 }
1353
1354 static void object_finalize_child_property(Object *obj, const char *name,
1355                                            void *opaque)
1356 {
1357     Object *child = opaque;
1358
1359     if (child->class->unparent) {
1360         (child->class->unparent)(child);
1361     }
1362     child->parent = NULL;
1363     object_unref(child);
1364 }
1365
1366 void object_property_add_child(Object *obj, const char *name,
1367                                Object *child, Error **errp)
1368 {
1369     Error *local_err = NULL;
1370     gchar *type;
1371     ObjectProperty *op;
1372
1373     if (child->parent != NULL) {
1374         error_setg(errp, "child object is already parented");
1375         return;
1376     }
1377
1378     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1379
1380     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1381                              object_finalize_child_property, child, &local_err);
1382     if (local_err) {
1383         error_propagate(errp, local_err);
1384         goto out;
1385     }
1386
1387     op->resolve = object_resolve_child_property;
1388     object_ref(child);
1389     child->parent = obj;
1390
1391 out:
1392     g_free(type);
1393 }
1394
1395 void object_property_allow_set_link(Object *obj, const char *name,
1396                                     Object *val, Error **errp)
1397 {
1398     /* Allow the link to be set, always */
1399 }
1400
1401 typedef struct {
1402     Object **child;
1403     void (*check)(Object *, const char *, Object *, Error **);
1404     ObjectPropertyLinkFlags flags;
1405 } LinkProperty;
1406
1407 static void object_get_link_property(Object *obj, Visitor *v, void *opaque,
1408                                      const char *name, Error **errp)
1409 {
1410     LinkProperty *lprop = opaque;
1411     Object **child = lprop->child;
1412     gchar *path;
1413
1414     if (*child) {
1415         path = object_get_canonical_path(*child);
1416         visit_type_str(v, name, &path, errp);
1417         g_free(path);
1418     } else {
1419         path = (gchar *)"";
1420         visit_type_str(v, name, &path, errp);
1421     }
1422 }
1423
1424 /*
1425  * object_resolve_link:
1426  *
1427  * Lookup an object and ensure its type matches the link property type.  This
1428  * is similar to object_resolve_path() except type verification against the
1429  * link property is performed.
1430  *
1431  * Returns: The matched object or NULL on path lookup failures.
1432  */
1433 static Object *object_resolve_link(Object *obj, const char *name,
1434                                    const char *path, Error **errp)
1435 {
1436     const char *type;
1437     gchar *target_type;
1438     bool ambiguous = false;
1439     Object *target;
1440
1441     /* Go from link<FOO> to FOO.  */
1442     type = object_property_get_type(obj, name, NULL);
1443     target_type = g_strndup(&type[5], strlen(type) - 6);
1444     target = object_resolve_path_type(path, target_type, &ambiguous);
1445
1446     if (ambiguous) {
1447         error_setg(errp, "Path '%s' does not uniquely identify an object",
1448                    path);
1449     } else if (!target) {
1450         target = object_resolve_path(path, &ambiguous);
1451         if (target || ambiguous) {
1452             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1453         } else {
1454             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1455                       "Device '%s' not found", path);
1456         }
1457         target = NULL;
1458     }
1459     g_free(target_type);
1460
1461     return target;
1462 }
1463
1464 static void object_set_link_property(Object *obj, Visitor *v, void *opaque,
1465                                      const char *name, Error **errp)
1466 {
1467     Error *local_err = NULL;
1468     LinkProperty *prop = opaque;
1469     Object **child = prop->child;
1470     Object *old_target = *child;
1471     Object *new_target = NULL;
1472     char *path = NULL;
1473
1474     visit_type_str(v, name, &path, &local_err);
1475
1476     if (!local_err && strcmp(path, "") != 0) {
1477         new_target = object_resolve_link(obj, name, path, &local_err);
1478     }
1479
1480     g_free(path);
1481     if (local_err) {
1482         error_propagate(errp, local_err);
1483         return;
1484     }
1485
1486     prop->check(obj, name, new_target, &local_err);
1487     if (local_err) {
1488         error_propagate(errp, local_err);
1489         return;
1490     }
1491
1492     object_ref(new_target);
1493     *child = new_target;
1494     object_unref(old_target);
1495 }
1496
1497 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1498 {
1499     LinkProperty *lprop = opaque;
1500
1501     return *lprop->child;
1502 }
1503
1504 static void object_release_link_property(Object *obj, const char *name,
1505                                          void *opaque)
1506 {
1507     LinkProperty *prop = opaque;
1508
1509     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1510         object_unref(*prop->child);
1511     }
1512     g_free(prop);
1513 }
1514
1515 void object_property_add_link(Object *obj, const char *name,
1516                               const char *type, Object **child,
1517                               void (*check)(Object *, const char *,
1518                                             Object *, Error **),
1519                               ObjectPropertyLinkFlags flags,
1520                               Error **errp)
1521 {
1522     Error *local_err = NULL;
1523     LinkProperty *prop = g_malloc(sizeof(*prop));
1524     gchar *full_type;
1525     ObjectProperty *op;
1526
1527     prop->child = child;
1528     prop->check = check;
1529     prop->flags = flags;
1530
1531     full_type = g_strdup_printf("link<%s>", type);
1532
1533     op = object_property_add(obj, name, full_type,
1534                              object_get_link_property,
1535                              check ? object_set_link_property : NULL,
1536                              object_release_link_property,
1537                              prop,
1538                              &local_err);
1539     if (local_err) {
1540         error_propagate(errp, local_err);
1541         g_free(prop);
1542         goto out;
1543     }
1544
1545     op->resolve = object_resolve_link_property;
1546
1547 out:
1548     g_free(full_type);
1549 }
1550
1551 void object_property_add_const_link(Object *obj, const char *name,
1552                                     Object *target, Error **errp)
1553 {
1554     char *link_type;
1555     ObjectProperty *op;
1556
1557     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1558     op = object_property_add(obj, name, link_type,
1559                              object_get_child_property, NULL,
1560                              NULL, target, errp);
1561     if (op != NULL) {
1562         op->resolve = object_resolve_child_property;
1563     }
1564     g_free(link_type);
1565 }
1566
1567 gchar *object_get_canonical_path_component(Object *obj)
1568 {
1569     ObjectProperty *prop = NULL;
1570     GHashTableIter iter;
1571
1572     g_assert(obj);
1573     g_assert(obj->parent != NULL);
1574
1575     g_hash_table_iter_init(&iter, obj->parent->properties);
1576     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1577         if (!object_property_is_child(prop)) {
1578             continue;
1579         }
1580
1581         if (prop->opaque == obj) {
1582             return g_strdup(prop->name);
1583         }
1584     }
1585
1586     /* obj had a parent but was not a child, should never happen */
1587     g_assert_not_reached();
1588     return NULL;
1589 }
1590
1591 gchar *object_get_canonical_path(Object *obj)
1592 {
1593     Object *root = object_get_root();
1594     char *newpath, *path = NULL;
1595
1596     while (obj != root) {
1597         char *component = object_get_canonical_path_component(obj);
1598
1599         if (path) {
1600             newpath = g_strdup_printf("%s/%s", component, path);
1601             g_free(component);
1602             g_free(path);
1603             path = newpath;
1604         } else {
1605             path = component;
1606         }
1607
1608         obj = obj->parent;
1609     }
1610
1611     newpath = g_strdup_printf("/%s", path ? path : "");
1612     g_free(path);
1613
1614     return newpath;
1615 }
1616
1617 Object *object_resolve_path_component(Object *parent, const gchar *part)
1618 {
1619     ObjectProperty *prop = object_property_find(parent, part, NULL);
1620     if (prop == NULL) {
1621         return NULL;
1622     }
1623
1624     if (prop->resolve) {
1625         return prop->resolve(parent, prop->opaque, part);
1626     } else {
1627         return NULL;
1628     }
1629 }
1630
1631 static Object *object_resolve_abs_path(Object *parent,
1632                                           gchar **parts,
1633                                           const char *typename,
1634                                           int index)
1635 {
1636     Object *child;
1637
1638     if (parts[index] == NULL) {
1639         return object_dynamic_cast(parent, typename);
1640     }
1641
1642     if (strcmp(parts[index], "") == 0) {
1643         return object_resolve_abs_path(parent, parts, typename, index + 1);
1644     }
1645
1646     child = object_resolve_path_component(parent, parts[index]);
1647     if (!child) {
1648         return NULL;
1649     }
1650
1651     return object_resolve_abs_path(child, parts, typename, index + 1);
1652 }
1653
1654 static Object *object_resolve_partial_path(Object *parent,
1655                                               gchar **parts,
1656                                               const char *typename,
1657                                               bool *ambiguous)
1658 {
1659     Object *obj;
1660     GHashTableIter iter;
1661     ObjectProperty *prop;
1662
1663     obj = object_resolve_abs_path(parent, parts, typename, 0);
1664
1665     g_hash_table_iter_init(&iter, parent->properties);
1666     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1667         Object *found;
1668
1669         if (!object_property_is_child(prop)) {
1670             continue;
1671         }
1672
1673         found = object_resolve_partial_path(prop->opaque, parts,
1674                                             typename, ambiguous);
1675         if (found) {
1676             if (obj) {
1677                 if (ambiguous) {
1678                     *ambiguous = true;
1679                 }
1680                 return NULL;
1681             }
1682             obj = found;
1683         }
1684
1685         if (ambiguous && *ambiguous) {
1686             return NULL;
1687         }
1688     }
1689
1690     return obj;
1691 }
1692
1693 Object *object_resolve_path_type(const char *path, const char *typename,
1694                                  bool *ambiguous)
1695 {
1696     Object *obj;
1697     gchar **parts;
1698
1699     parts = g_strsplit(path, "/", 0);
1700     assert(parts);
1701
1702     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1703         if (ambiguous) {
1704             *ambiguous = false;
1705         }
1706         obj = object_resolve_partial_path(object_get_root(), parts,
1707                                           typename, ambiguous);
1708     } else {
1709         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1710     }
1711
1712     g_strfreev(parts);
1713
1714     return obj;
1715 }
1716
1717 Object *object_resolve_path(const char *path, bool *ambiguous)
1718 {
1719     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1720 }
1721
1722 typedef struct StringProperty
1723 {
1724     char *(*get)(Object *, Error **);
1725     void (*set)(Object *, const char *, Error **);
1726 } StringProperty;
1727
1728 static void property_get_str(Object *obj, Visitor *v, void *opaque,
1729                              const char *name, Error **errp)
1730 {
1731     StringProperty *prop = opaque;
1732     char *value;
1733     Error *err = NULL;
1734
1735     value = prop->get(obj, &err);
1736     if (err) {
1737         error_propagate(errp, err);
1738         return;
1739     }
1740
1741     visit_type_str(v, name, &value, errp);
1742     g_free(value);
1743 }
1744
1745 static void property_set_str(Object *obj, Visitor *v, void *opaque,
1746                              const char *name, Error **errp)
1747 {
1748     StringProperty *prop = opaque;
1749     char *value;
1750     Error *local_err = NULL;
1751
1752     visit_type_str(v, name, &value, &local_err);
1753     if (local_err) {
1754         error_propagate(errp, local_err);
1755         return;
1756     }
1757
1758     prop->set(obj, value, errp);
1759     g_free(value);
1760 }
1761
1762 static void property_release_str(Object *obj, const char *name,
1763                                  void *opaque)
1764 {
1765     StringProperty *prop = opaque;
1766     g_free(prop);
1767 }
1768
1769 void object_property_add_str(Object *obj, const char *name,
1770                            char *(*get)(Object *, Error **),
1771                            void (*set)(Object *, const char *, Error **),
1772                            Error **errp)
1773 {
1774     Error *local_err = NULL;
1775     StringProperty *prop = g_malloc0(sizeof(*prop));
1776
1777     prop->get = get;
1778     prop->set = set;
1779
1780     object_property_add(obj, name, "string",
1781                         get ? property_get_str : NULL,
1782                         set ? property_set_str : NULL,
1783                         property_release_str,
1784                         prop, &local_err);
1785     if (local_err) {
1786         error_propagate(errp, local_err);
1787         g_free(prop);
1788     }
1789 }
1790
1791 void object_class_property_add_str(ObjectClass *klass, const char *name,
1792                                    char *(*get)(Object *, Error **),
1793                                    void (*set)(Object *, const char *,
1794                                                Error **),
1795                                    Error **errp)
1796 {
1797     Error *local_err = NULL;
1798     StringProperty *prop = g_malloc0(sizeof(*prop));
1799
1800     prop->get = get;
1801     prop->set = set;
1802
1803     object_class_property_add(klass, name, "string",
1804                               get ? property_get_str : NULL,
1805                               set ? property_set_str : NULL,
1806                               property_release_str,
1807                               prop, &local_err);
1808     if (local_err) {
1809         error_propagate(errp, local_err);
1810         g_free(prop);
1811     }
1812 }
1813
1814 typedef struct BoolProperty
1815 {
1816     bool (*get)(Object *, Error **);
1817     void (*set)(Object *, bool, Error **);
1818 } BoolProperty;
1819
1820 static void property_get_bool(Object *obj, Visitor *v, void *opaque,
1821                               const char *name, Error **errp)
1822 {
1823     BoolProperty *prop = opaque;
1824     bool value;
1825     Error *err = NULL;
1826
1827     value = prop->get(obj, &err);
1828     if (err) {
1829         error_propagate(errp, err);
1830         return;
1831     }
1832
1833     visit_type_bool(v, name, &value, errp);
1834 }
1835
1836 static void property_set_bool(Object *obj, Visitor *v, void *opaque,
1837                               const char *name, Error **errp)
1838 {
1839     BoolProperty *prop = opaque;
1840     bool value;
1841     Error *local_err = NULL;
1842
1843     visit_type_bool(v, name, &value, &local_err);
1844     if (local_err) {
1845         error_propagate(errp, local_err);
1846         return;
1847     }
1848
1849     prop->set(obj, value, errp);
1850 }
1851
1852 static void property_release_bool(Object *obj, const char *name,
1853                                   void *opaque)
1854 {
1855     BoolProperty *prop = opaque;
1856     g_free(prop);
1857 }
1858
1859 void object_property_add_bool(Object *obj, const char *name,
1860                               bool (*get)(Object *, Error **),
1861                               void (*set)(Object *, bool, Error **),
1862                               Error **errp)
1863 {
1864     Error *local_err = NULL;
1865     BoolProperty *prop = g_malloc0(sizeof(*prop));
1866
1867     prop->get = get;
1868     prop->set = set;
1869
1870     object_property_add(obj, name, "bool",
1871                         get ? property_get_bool : NULL,
1872                         set ? property_set_bool : NULL,
1873                         property_release_bool,
1874                         prop, &local_err);
1875     if (local_err) {
1876         error_propagate(errp, local_err);
1877         g_free(prop);
1878     }
1879 }
1880
1881 void object_class_property_add_bool(ObjectClass *klass, const char *name,
1882                                     bool (*get)(Object *, Error **),
1883                                     void (*set)(Object *, bool, Error **),
1884                                     Error **errp)
1885 {
1886     Error *local_err = NULL;
1887     BoolProperty *prop = g_malloc0(sizeof(*prop));
1888
1889     prop->get = get;
1890     prop->set = set;
1891
1892     object_class_property_add(klass, name, "bool",
1893                               get ? property_get_bool : NULL,
1894                               set ? property_set_bool : NULL,
1895                               property_release_bool,
1896                               prop, &local_err);
1897     if (local_err) {
1898         error_propagate(errp, local_err);
1899         g_free(prop);
1900     }
1901 }
1902
1903 static void property_get_enum(Object *obj, Visitor *v, void *opaque,
1904                               const char *name, Error **errp)
1905 {
1906     EnumProperty *prop = opaque;
1907     int value;
1908     Error *err = NULL;
1909
1910     value = prop->get(obj, &err);
1911     if (err) {
1912         error_propagate(errp, err);
1913         return;
1914     }
1915
1916     visit_type_enum(v, name, &value, prop->strings, NULL, errp);
1917 }
1918
1919 static void property_set_enum(Object *obj, Visitor *v, void *opaque,
1920                               const char *name, Error **errp)
1921 {
1922     EnumProperty *prop = opaque;
1923     int value;
1924     Error *err = NULL;
1925
1926     visit_type_enum(v, name, &value, prop->strings, NULL, &err);
1927     if (err) {
1928         error_propagate(errp, err);
1929         return;
1930     }
1931     prop->set(obj, value, errp);
1932 }
1933
1934 static void property_release_enum(Object *obj, const char *name,
1935                                   void *opaque)
1936 {
1937     EnumProperty *prop = opaque;
1938     g_free(prop);
1939 }
1940
1941 void object_property_add_enum(Object *obj, const char *name,
1942                               const char *typename,
1943                               const char * const *strings,
1944                               int (*get)(Object *, Error **),
1945                               void (*set)(Object *, int, Error **),
1946                               Error **errp)
1947 {
1948     Error *local_err = NULL;
1949     EnumProperty *prop = g_malloc(sizeof(*prop));
1950
1951     prop->strings = strings;
1952     prop->get = get;
1953     prop->set = set;
1954
1955     object_property_add(obj, name, typename,
1956                         get ? property_get_enum : NULL,
1957                         set ? property_set_enum : NULL,
1958                         property_release_enum,
1959                         prop, &local_err);
1960     if (local_err) {
1961         error_propagate(errp, local_err);
1962         g_free(prop);
1963     }
1964 }
1965
1966 void object_class_property_add_enum(ObjectClass *klass, const char *name,
1967                                     const char *typename,
1968                                     const char * const *strings,
1969                                     int (*get)(Object *, Error **),
1970                                     void (*set)(Object *, int, Error **),
1971                                     Error **errp)
1972 {
1973     Error *local_err = NULL;
1974     EnumProperty *prop = g_malloc(sizeof(*prop));
1975
1976     prop->strings = strings;
1977     prop->get = get;
1978     prop->set = set;
1979
1980     object_class_property_add(klass, name, typename,
1981                               get ? property_get_enum : NULL,
1982                               set ? property_set_enum : NULL,
1983                               property_release_enum,
1984                               prop, &local_err);
1985     if (local_err) {
1986         error_propagate(errp, local_err);
1987         g_free(prop);
1988     }
1989 }
1990
1991 typedef struct TMProperty {
1992     void (*get)(Object *, struct tm *, Error **);
1993 } TMProperty;
1994
1995 static void property_get_tm(Object *obj, Visitor *v, void *opaque,
1996                             const char *name, Error **errp)
1997 {
1998     TMProperty *prop = opaque;
1999     Error *err = NULL;
2000     struct tm value;
2001
2002     prop->get(obj, &value, &err);
2003     if (err) {
2004         goto out;
2005     }
2006
2007     visit_start_struct(v, name, NULL, "struct tm", 0, &err);
2008     if (err) {
2009         goto out;
2010     }
2011     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2012     if (err) {
2013         goto out_end;
2014     }
2015     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2016     if (err) {
2017         goto out_end;
2018     }
2019     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2020     if (err) {
2021         goto out_end;
2022     }
2023     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2024     if (err) {
2025         goto out_end;
2026     }
2027     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2028     if (err) {
2029         goto out_end;
2030     }
2031     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2032     if (err) {
2033         goto out_end;
2034     }
2035 out_end:
2036     error_propagate(errp, err);
2037     err = NULL;
2038     visit_end_struct(v, errp);
2039 out:
2040     error_propagate(errp, err);
2041
2042 }
2043
2044 static void property_release_tm(Object *obj, const char *name,
2045                                 void *opaque)
2046 {
2047     TMProperty *prop = opaque;
2048     g_free(prop);
2049 }
2050
2051 void object_property_add_tm(Object *obj, const char *name,
2052                             void (*get)(Object *, struct tm *, Error **),
2053                             Error **errp)
2054 {
2055     Error *local_err = NULL;
2056     TMProperty *prop = g_malloc0(sizeof(*prop));
2057
2058     prop->get = get;
2059
2060     object_property_add(obj, name, "struct tm",
2061                         get ? property_get_tm : NULL, NULL,
2062                         property_release_tm,
2063                         prop, &local_err);
2064     if (local_err) {
2065         error_propagate(errp, local_err);
2066         g_free(prop);
2067     }
2068 }
2069
2070 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2071                                   void (*get)(Object *, struct tm *, Error **),
2072                                   Error **errp)
2073 {
2074     Error *local_err = NULL;
2075     TMProperty *prop = g_malloc0(sizeof(*prop));
2076
2077     prop->get = get;
2078
2079     object_class_property_add(klass, name, "struct tm",
2080                               get ? property_get_tm : NULL, NULL,
2081                               property_release_tm,
2082                               prop, &local_err);
2083     if (local_err) {
2084         error_propagate(errp, local_err);
2085         g_free(prop);
2086     }
2087 }
2088
2089 static char *qdev_get_type(Object *obj, Error **errp)
2090 {
2091     return g_strdup(object_get_typename(obj));
2092 }
2093
2094 static void property_get_uint8_ptr(Object *obj, Visitor *v,
2095                                    void *opaque, const char *name,
2096                                    Error **errp)
2097 {
2098     uint8_t value = *(uint8_t *)opaque;
2099     visit_type_uint8(v, name, &value, errp);
2100 }
2101
2102 static void property_get_uint16_ptr(Object *obj, Visitor *v,
2103                                    void *opaque, const char *name,
2104                                    Error **errp)
2105 {
2106     uint16_t value = *(uint16_t *)opaque;
2107     visit_type_uint16(v, name, &value, errp);
2108 }
2109
2110 static void property_get_uint32_ptr(Object *obj, Visitor *v,
2111                                    void *opaque, const char *name,
2112                                    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,
2119                                    void *opaque, const char *name,
2120                                    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, void *opaque,
2188                                const char *name, 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, void *opaque,
2196                                const char *name, 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)