qom/object.c

   1 /*
   2  * QEMU Object Model
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <[email protected]>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "qapi/error.h"
  15 #include "qom/object.h"
  16 #include "qom/object_interfaces.h"
  17 #include "qemu/cutils.h"
  18 #include "qapi/visitor.h"
  19 #include "qapi-visit.h"
  20 #include "qapi/string-input-visitor.h"
  21 #include "qapi/string-output-visitor.h"
  22 #include "qapi/qmp/qerror.h"
  23 #include "trace.h"
  24
  25 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  26  * of the QOM core on QObject?  */
  27 #include "qom/qom-qobject.h"
  28 #include "qapi/qmp/qobject.h"
  29 #include "qapi/qmp/qbool.h"
  30 #include "qapi/qmp/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 size_t object_type_get_instance_size(const char *typename)
 205 {
 206     TypeImpl *type = type_get_by_name(typename);
 207
 208     g_assert(type != NULL);
 209     return type_object_get_size(type);
 210 }
 211
 212 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 213 {
 214     assert(target_type);
 215
 216     /* Check if target_type is a direct ancestor of type */
 217     while (type) {
 218         if (type == target_type) {
 219             return true;
 220         }
 221
 222         type = type_get_parent(type);
 223     }
 224
 225     return false;
 226 }
 227
 228 static void type_initialize(TypeImpl *ti);
 229
 230 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 231                                       TypeImpl *parent_type)
 232 {
 233     InterfaceClass *new_iface;
 234     TypeInfo info = { };
 235     TypeImpl *iface_impl;
 236
 237     info.parent = parent_type->name;
 238     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 239     info.abstract = true;
 240
 241     iface_impl = type_new(&info);
 242     iface_impl->parent_type = parent_type;
 243     type_initialize(iface_impl);
 244     g_free((char *)info.name);
 245
 246     new_iface = (InterfaceClass *)iface_impl->class;
 247     new_iface->concrete_class = ti->class;
 248     new_iface->interface_type = interface_type;
 249
 250     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 251                                            iface_impl->class);
 252 }
 253
 254 static void object_property_free(gpointer data)
 255 {
 256     ObjectProperty *prop = data;
 257
 258     g_free(prop->name);
 259     g_free(prop->type);
 260     g_free(prop->description);
 261     g_free(prop);
 262 }
 263
 264 static void type_initialize(TypeImpl *ti)
 265 {
 266     TypeImpl *parent;
 267
 268     if (ti->class) {
 269         return;
 270     }
 271
 272     ti->class_size = type_class_get_size(ti);
 273     ti->instance_size = type_object_get_size(ti);
 274     /* Any type with zero instance_size is implicitly abstract.
 275      * This means interface types are all abstract.
 276      */
 277     if (ti->instance_size == 0) {
 278         ti->abstract = true;
 279     }
 280
 281     ti->class = g_malloc0(ti->class_size);
 282
 283     parent = type_get_parent(ti);
 284     if (parent) {
 285         type_initialize(parent);
 286         GSList *e;
 287         int i;
 288
 289         g_assert_cmpint(parent->class_size, <=, ti->class_size);
 290         memcpy(ti->class, parent->class, parent->class_size);
 291         ti->class->interfaces = NULL;
 292         ti->class->properties = g_hash_table_new_full(
 293             g_str_hash, g_str_equal, g_free, object_property_free);
 294
 295         for (e = parent->class->interfaces; e; e = e->next) {
 296             InterfaceClass *iface = e->data;
 297             ObjectClass *klass = OBJECT_CLASS(iface);
 298
 299             type_initialize_interface(ti, iface->interface_type, klass->type);
 300         }
 301
 302         for (i = 0; i < ti->num_interfaces; i++) {
 303             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 304             for (e = ti->class->interfaces; e; e = e->next) {
 305                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 306
 307                 if (type_is_ancestor(target_type, t)) {
 308                     break;
 309                 }
 310             }
 311
 312             if (e) {
 313                 continue;
 314             }
 315
 316             type_initialize_interface(ti, t, t);
 317         }
 318     } else {
 319         ti->class->properties = g_hash_table_new_full(
 320             g_str_hash, g_str_equal, g_free, object_property_free);
 321     }
 322
 323     ti->class->type = ti;
 324
 325     while (parent) {
 326         if (parent->class_base_init) {
 327             parent->class_base_init(ti->class, ti->class_data);
 328         }
 329         parent = type_get_parent(parent);
 330     }
 331
 332     if (ti->class_init) {
 333         ti->class_init(ti->class, ti->class_data);
 334     }
 335 }
 336
 337 static void object_init_with_type(Object *obj, TypeImpl *ti)
 338 {
 339     if (type_has_parent(ti)) {
 340         object_init_with_type(obj, type_get_parent(ti));
 341     }
 342
 343     if (ti->instance_init) {
 344         ti->instance_init(obj);
 345     }
 346 }
 347
 348 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 349 {
 350     if (ti->instance_post_init) {
 351         ti->instance_post_init(obj);
 352     }
 353
 354     if (type_has_parent(ti)) {
 355         object_post_init_with_type(obj, type_get_parent(ti));
 356     }
 357 }
 358
 359 static void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 360 {
 361     Object *obj = data;
 362
 363     g_assert(type != NULL);
 364     type_initialize(type);
 365
 366     g_assert_cmpint(type->instance_size, >=, sizeof(Object));
 367     g_assert(type->abstract == false);
 368     g_assert_cmpint(size, >=, type->instance_size);
 369
 370     memset(obj, 0, type->instance_size);
 371     obj->class = type->class;
 372     object_ref(obj);
 373     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 374                                             NULL, object_property_free);
 375     object_init_with_type(obj, type);
 376     object_post_init_with_type(obj, type);
 377 }
 378
 379 void object_initialize(void *data, size_t size, const char *typename)
 380 {
 381     TypeImpl *type = type_get_by_name(typename);
 382
 383     object_initialize_with_type(data, size, type);
 384 }
 385
 386 static inline bool object_property_is_child(ObjectProperty *prop)
 387 {
 388     return strstart(prop->type, "child<", NULL);
 389 }
 390
 391 static void object_property_del_all(Object *obj)
 392 {
 393     ObjectProperty *prop;
 394     GHashTableIter iter;
 395     gpointer key, value;
 396     bool released;
 397
 398     do {
 399         released = false;
 400         g_hash_table_iter_init(&iter, obj->properties);
 401         while (g_hash_table_iter_next(&iter, &key, &value)) {
 402             prop = value;
 403             if (prop->release) {
 404                 prop->release(obj, prop->name, prop->opaque);
 405                 prop->release = NULL;
 406                 released = true;
 407                 break;
 408             }
 409             g_hash_table_iter_remove(&iter);
 410         }
 411     } while (released);
 412
 413     g_hash_table_unref(obj->properties);
 414 }
 415
 416 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 417 {
 418     ObjectProperty *prop;
 419     GHashTableIter iter;
 420     gpointer key, value;
 421
 422     g_hash_table_iter_init(&iter, obj->properties);
 423     while (g_hash_table_iter_next(&iter, &key, &value)) {
 424         prop = value;
 425         if (object_property_is_child(prop) && prop->opaque == child) {
 426             if (prop->release) {
 427                 prop->release(obj, prop->name, prop->opaque);
 428                 prop->release = NULL;
 429             }
 430             break;
 431         }
 432     }
 433     g_hash_table_iter_init(&iter, obj->properties);
 434     while (g_hash_table_iter_next(&iter, &key, &value)) {
 435         prop = value;
 436         if (object_property_is_child(prop) && prop->opaque == child) {
 437             g_hash_table_iter_remove(&iter);
 438             break;
 439         }
 440     }
 441 }
 442
 443 void object_unparent(Object *obj)
 444 {
 445     if (obj->parent) {
 446         object_property_del_child(obj->parent, obj, NULL);
 447     }
 448 }
 449
 450 static void object_deinit(Object *obj, TypeImpl *type)
 451 {
 452     if (type->instance_finalize) {
 453         type->instance_finalize(obj);
 454     }
 455
 456     if (type_has_parent(type)) {
 457         object_deinit(obj, type_get_parent(type));
 458     }
 459 }
 460
 461 static void object_finalize(void *data)
 462 {
 463     Object *obj = data;
 464     TypeImpl *ti = obj->class->type;
 465
 466     object_property_del_all(obj);
 467     object_deinit(obj, ti);
 468
 469     g_assert_cmpint(obj->ref, ==, 0);
 470     if (obj->free) {
 471         obj->free(obj);
 472     }
 473 }
 474
 475 static Object *object_new_with_type(Type type)
 476 {
 477     Object *obj;
 478
 479     g_assert(type != NULL);
 480     type_initialize(type);
 481
 482     obj = g_malloc(type->instance_size);
 483     object_initialize_with_type(obj, type->instance_size, type);
 484     obj->free = g_free;
 485
 486     return obj;
 487 }
 488
 489 Object *object_new(const char *typename)
 490 {
 491     TypeImpl *ti = type_get_by_name(typename);
 492
 493     return object_new_with_type(ti);
 494 }
 495
 496
 497 Object *object_new_with_props(const char *typename,
 498                               Object *parent,
 499                               const char *id,
 500                               Error **errp,
 501                               ...)
 502 {
 503     va_list vargs;
 504     Object *obj;
 505
 506     va_start(vargs, errp);
 507     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 508     va_end(vargs);
 509
 510     return obj;
 511 }
 512
 513
 514 Object *object_new_with_propv(const char *typename,
 515                               Object *parent,
 516                               const char *id,
 517                               Error **errp,
 518                               va_list vargs)
 519 {
 520     Object *obj;
 521     ObjectClass *klass;
 522     Error *local_err = NULL;
 523
 524     klass = object_class_by_name(typename);
 525     if (!klass) {
 526         error_setg(errp, "invalid object type: %s", typename);
 527         return NULL;
 528     }
 529
 530     if (object_class_is_abstract(klass)) {
 531         error_setg(errp, "object type '%s' is abstract", typename);
 532         return NULL;
 533     }
 534     obj = object_new(typename);
 535
 536     if (object_set_propv(obj, &local_err, vargs) < 0) {
 537         goto error;
 538     }
 539
 540     object_property_add_child(parent, id, obj, &local_err);
 541     if (local_err) {
 542         goto error;
 543     }
 544
 545     if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
 546         user_creatable_complete(obj, &local_err);
 547         if (local_err) {
 548             object_unparent(obj);
 549             goto error;
 550         }
 551     }
 552
 553     object_unref(OBJECT(obj));
 554     return obj;
 555
 556  error:
 557     error_propagate(errp, local_err);
 558     object_unref(obj);
 559     return NULL;
 560 }
 561
 562
 563 int object_set_props(Object *obj,
 564                      Error **errp,
 565                      ...)
 566 {
 567     va_list vargs;
 568     int ret;
 569
 570     va_start(vargs, errp);
 571     ret = object_set_propv(obj, errp, vargs);
 572     va_end(vargs);
 573
 574     return ret;
 575 }
 576
 577
 578 int object_set_propv(Object *obj,
 579                      Error **errp,
 580                      va_list vargs)
 581 {
 582     const char *propname;
 583     Error *local_err = NULL;
 584
 585     propname = va_arg(vargs, char *);
 586     while (propname != NULL) {
 587         const char *value = va_arg(vargs, char *);
 588
 589         g_assert(value != NULL);
 590         object_property_parse(obj, value, propname, &local_err);
 591         if (local_err) {
 592             error_propagate(errp, local_err);
 593             return -1;
 594         }
 595         propname = va_arg(vargs, char *);
 596     }
 597
 598     return 0;
 599 }
 600
 601
 602 Object *object_dynamic_cast(Object *obj, const char *typename)
 603 {
 604     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 605         return obj;
 606     }
 607
 608     return NULL;
 609 }
 610
 611 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 612                                    const char *file, int line, const char *func)
 613 {
 614     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 615                                      typename, file, line, func);
 616
 617 #ifdef CONFIG_QOM_CAST_DEBUG
 618     int i;
 619     Object *inst;
 620
 621     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 622         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 623             goto out;
 624         }
 625     }
 626
 627     inst = object_dynamic_cast(obj, typename);
 628
 629     if (!inst && obj) {
 630         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 631                 file, line, func, obj, typename);
 632         abort();
 633     }
 634
 635     assert(obj == inst);
 636
 637     if (obj && obj == inst) {
 638         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 639             atomic_set(&obj->class->object_cast_cache[i - 1],
 640                        atomic_read(&obj->class->object_cast_cache[i]));
 641         }
 642         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 643     }
 644
 645 out:
 646 #endif
 647     return obj;
 648 }
 649
 650 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 651                                        const char *typename)
 652 {
 653     ObjectClass *ret = NULL;
 654     TypeImpl *target_type;
 655     TypeImpl *type;
 656
 657     if (!class) {
 658         return NULL;
 659     }
 660
 661     /* A simple fast path that can trigger a lot for leaf classes.  */
 662     type = class->type;
 663     if (type->name == typename) {
 664         return class;
 665     }
 666
 667     target_type = type_get_by_name(typename);
 668     if (!target_type) {
 669         /* target class type unknown, so fail the cast */
 670         return NULL;
 671     }
 672
 673     if (type->class->interfaces &&
 674             type_is_ancestor(target_type, type_interface)) {
 675         int found = 0;
 676         GSList *i;
 677
 678         for (i = class->interfaces; i; i = i->next) {
 679             ObjectClass *target_class = i->data;
 680
 681             if (type_is_ancestor(target_class->type, target_type)) {
 682                 ret = target_class;
 683                 found++;
 684             }
 685          }
 686
 687         /* The match was ambiguous, don't allow a cast */
 688         if (found > 1) {
 689             ret = NULL;
 690         }
 691     } else if (type_is_ancestor(type, target_type)) {
 692         ret = class;
 693     }
 694
 695     return ret;
 696 }
 697
 698 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 699                                               const char *typename,
 700                                               const char *file, int line,
 701                                               const char *func)
 702 {
 703     ObjectClass *ret;
 704
 705     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 706                                            typename, file, line, func);
 707
 708 #ifdef CONFIG_QOM_CAST_DEBUG
 709     int i;
 710
 711     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 712         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 713             ret = class;
 714             goto out;
 715         }
 716     }
 717 #else
 718     if (!class || !class->interfaces) {
 719         return class;
 720     }
 721 #endif
 722
 723     ret = object_class_dynamic_cast(class, typename);
 724     if (!ret && class) {
 725         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 726                 file, line, func, class, typename);
 727         abort();
 728     }
 729
 730 #ifdef CONFIG_QOM_CAST_DEBUG
 731     if (class && ret == class) {
 732         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 733             atomic_set(&class->class_cast_cache[i - 1],
 734                        atomic_read(&class->class_cast_cache[i]));
 735         }
 736         atomic_set(&class->class_cast_cache[i - 1], typename);
 737     }
 738 out:
 739 #endif
 740     return ret;
 741 }
 742
 743 const char *object_get_typename(const Object *obj)
 744 {
 745     return obj->class->type->name;
 746 }
 747
 748 ObjectClass *object_get_class(Object *obj)
 749 {
 750     return obj->class;
 751 }
 752
 753 bool object_class_is_abstract(ObjectClass *klass)
 754 {
 755     return klass->type->abstract;
 756 }
 757
 758 const char *object_class_get_name(ObjectClass *klass)
 759 {
 760     return klass->type->name;
 761 }
 762
 763 ObjectClass *object_class_by_name(const char *typename)
 764 {
 765     TypeImpl *type = type_get_by_name(typename);
 766
 767     if (!type) {
 768         return NULL;
 769     }
 770
 771     type_initialize(type);
 772
 773     return type->class;
 774 }
 775
 776 ObjectClass *object_class_get_parent(ObjectClass *class)
 777 {
 778     TypeImpl *type = type_get_parent(class->type);
 779
 780     if (!type) {
 781         return NULL;
 782     }
 783
 784     type_initialize(type);
 785
 786     return type->class;
 787 }
 788
 789 typedef struct OCFData
 790 {
 791     void (*fn)(ObjectClass *klass, void *opaque);
 792     const char *implements_type;
 793     bool include_abstract;
 794     void *opaque;
 795 } OCFData;
 796
 797 static void object_class_foreach_tramp(gpointer key, gpointer value,
 798                                        gpointer opaque)
 799 {
 800     OCFData *data = opaque;
 801     TypeImpl *type = value;
 802     ObjectClass *k;
 803
 804     type_initialize(type);
 805     k = type->class;
 806
 807     if (!data->include_abstract && type->abstract) {
 808         return;
 809     }
 810
 811     if (data->implements_type &&
 812         !object_class_dynamic_cast(k, data->implements_type)) {
 813         return;
 814     }
 815
 816     data->fn(k, data->opaque);
 817 }
 818
 819 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 820                           const char *implements_type, bool include_abstract,
 821                           void *opaque)
 822 {
 823     OCFData data = { fn, implements_type, include_abstract, opaque };
 824
 825     enumerating_types = true;
 826     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 827     enumerating_types = false;
 828 }
 829
 830 static int do_object_child_foreach(Object *obj,
 831                                    int (*fn)(Object *child, void *opaque),
 832                                    void *opaque, bool recurse)
 833 {
 834     GHashTableIter iter;
 835     ObjectProperty *prop;
 836     int ret = 0;
 837
 838     g_hash_table_iter_init(&iter, obj->properties);
 839     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
 840         if (object_property_is_child(prop)) {
 841             Object *child = prop->opaque;
 842
 843             ret = fn(child, opaque);
 844             if (ret != 0) {
 845                 break;
 846             }
 847             if (recurse) {
 848                 do_object_child_foreach(child, fn, opaque, true);
 849             }
 850         }
 851     }
 852     return ret;
 853 }
 854
 855 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 856                          void *opaque)
 857 {
 858     return do_object_child_foreach(obj, fn, opaque, false);
 859 }
 860
 861 int object_child_foreach_recursive(Object *obj,
 862                                    int (*fn)(Object *child, void *opaque),
 863                                    void *opaque)
 864 {
 865     return do_object_child_foreach(obj, fn, opaque, true);
 866 }
 867
 868 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 869 {
 870     GSList **list = opaque;
 871
 872     *list = g_slist_prepend(*list, klass);
 873 }
 874
 875 GSList *object_class_get_list(const char *implements_type,
 876                               bool include_abstract)
 877 {
 878     GSList *list = NULL;
 879
 880     object_class_foreach(object_class_get_list_tramp,
 881                          implements_type, include_abstract, &list);
 882     return list;
 883 }
 884
 885 void object_ref(Object *obj)
 886 {
 887     if (!obj) {
 888         return;
 889     }
 890     atomic_inc(&obj->ref);
 891 }
 892
 893 void object_unref(Object *obj)
 894 {
 895     if (!obj) {
 896         return;
 897     }
 898     g_assert_cmpint(obj->ref, >, 0);
 899
 900     /* parent always holds a reference to its children */
 901     if (atomic_fetch_dec(&obj->ref) == 1) {
 902         object_finalize(obj);
 903     }
 904 }
 905
 906 ObjectProperty *
 907 object_property_add(Object *obj, const char *name, const char *type,
 908                     ObjectPropertyAccessor *get,
 909                     ObjectPropertyAccessor *set,
 910                     ObjectPropertyRelease *release,
 911                     void *opaque, Error **errp)
 912 {
 913     ObjectProperty *prop;
 914     size_t name_len = strlen(name);
 915
 916     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
 917         int i;
 918         ObjectProperty *ret;
 919         char *name_no_array = g_strdup(name);
 920
 921         name_no_array[name_len - 3] = '\0';
 922         for (i = 0; ; ++i) {
 923             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
 924
 925             ret = object_property_add(obj, full_name, type, get, set,
 926                                       release, opaque, NULL);
 927             g_free(full_name);
 928             if (ret) {
 929                 break;
 930             }
 931         }
 932         g_free(name_no_array);
 933         return ret;
 934     }
 935
 936     if (object_property_find(obj, name, NULL) != NULL) {
 937         error_setg(errp, "attempt to add duplicate property '%s'"
 938                    " to object (type '%s')", name,
 939                    object_get_typename(obj));
 940         return NULL;
 941     }
 942
 943     prop = g_malloc0(sizeof(*prop));
 944
 945     prop->name = g_strdup(name);
 946     prop->type = g_strdup(type);
 947
 948     prop->get = get;
 949     prop->set = set;
 950     prop->release = release;
 951     prop->opaque = opaque;
 952
 953     g_hash_table_insert(obj->properties, prop->name, prop);
 954     return prop;
 955 }
 956
 957 ObjectProperty *
 958 object_class_property_add(ObjectClass *klass,
 959                           const char *name,
 960                           const char *type,
 961                           ObjectPropertyAccessor *get,
 962                           ObjectPropertyAccessor *set,
 963                           ObjectPropertyRelease *release,
 964                           void *opaque,
 965                           Error **errp)
 966 {
 967     ObjectProperty *prop;
 968
 969     if (object_class_property_find(klass, name, NULL) != NULL) {
 970         error_setg(errp, "attempt to add duplicate property '%s'"
 971                    " to object (type '%s')", name,
 972                    object_class_get_name(klass));
 973         return NULL;
 974     }
 975
 976     prop = g_malloc0(sizeof(*prop));
 977
 978     prop->name = g_strdup(name);
 979     prop->type = g_strdup(type);
 980
 981     prop->get = get;
 982     prop->set = set;
 983     prop->release = release;
 984     prop->opaque = opaque;
 985
 986     g_hash_table_insert(klass->properties, g_strdup(name), prop);
 987
 988     return prop;
 989 }
 990
 991 ObjectProperty *object_property_find(Object *obj, const char *name,
 992                                      Error **errp)
 993 {
 994     ObjectProperty *prop;
 995     ObjectClass *klass = object_get_class(obj);
 996
 997     prop = object_class_property_find(klass, name, NULL);
 998     if (prop) {
 999         return prop;
1000     }
1001
1002     prop = g_hash_table_lookup(obj->properties, name);
1003     if (prop) {
1004         return prop;
1005     }
1006
1007     error_setg(errp, "Property '.%s' not found", name);
1008     return NULL;
1009 }
1010
1011 void object_property_iter_init(ObjectPropertyIterator *iter,
1012                                Object *obj)
1013 {
1014     g_hash_table_iter_init(&iter->iter, obj->properties);
1015     iter->nextclass = object_get_class(obj);
1016 }
1017
1018 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1019 {
1020     gpointer key, val;
1021     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1022         if (!iter->nextclass) {
1023             return NULL;
1024         }
1025         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1026         iter->nextclass = object_class_get_parent(iter->nextclass);
1027     }
1028     return val;
1029 }
1030
1031 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1032                                            Error **errp)
1033 {
1034     ObjectProperty *prop;
1035     ObjectClass *parent_klass;
1036
1037     parent_klass = object_class_get_parent(klass);
1038     if (parent_klass) {
1039         prop = object_class_property_find(parent_klass, name, NULL);
1040         if (prop) {
1041             return prop;
1042         }
1043     }
1044
1045     prop = g_hash_table_lookup(klass->properties, name);
1046     if (!prop) {
1047         error_setg(errp, "Property '.%s' not found", name);
1048     }
1049     return prop;
1050 }
1051
1052 void object_property_del(Object *obj, const char *name, Error **errp)
1053 {
1054     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1055
1056     if (!prop) {
1057         error_setg(errp, "Property '.%s' not found", name);
1058         return;
1059     }
1060
1061     if (prop->release) {
1062         prop->release(obj, name, prop->opaque);
1063     }
1064     g_hash_table_remove(obj->properties, name);
1065 }
1066
1067 void object_property_get(Object *obj, Visitor *v, const char *name,
1068                          Error **errp)
1069 {
1070     ObjectProperty *prop = object_property_find(obj, name, errp);
1071     if (prop == NULL) {
1072         return;
1073     }
1074
1075     if (!prop->get) {
1076         error_setg(errp, QERR_PERMISSION_DENIED);
1077     } else {
1078         prop->get(obj, v, name, prop->opaque, errp);
1079     }
1080 }
1081
1082 void object_property_set(Object *obj, Visitor *v, const char *name,
1083                          Error **errp)
1084 {
1085     ObjectProperty *prop = object_property_find(obj, name, errp);
1086     if (prop == NULL) {
1087         return;
1088     }
1089
1090     if (!prop->set) {
1091         error_setg(errp, QERR_PERMISSION_DENIED);
1092     } else {
1093         prop->set(obj, v, name, prop->opaque, errp);
1094     }
1095 }
1096
1097 void object_property_set_str(Object *obj, const char *value,
1098                              const char *name, Error **errp)
1099 {
1100     QString *qstr = qstring_from_str(value);
1101     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1102
1103     QDECREF(qstr);
1104 }
1105
1106 char *object_property_get_str(Object *obj, const char *name,
1107                               Error **errp)
1108 {
1109     QObject *ret = object_property_get_qobject(obj, name, errp);
1110     QString *qstring;
1111     char *retval;
1112
1113     if (!ret) {
1114         return NULL;
1115     }
1116     qstring = qobject_to_qstring(ret);
1117     if (!qstring) {
1118         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1119         retval = NULL;
1120     } else {
1121         retval = g_strdup(qstring_get_str(qstring));
1122     }
1123
1124     qobject_decref(ret);
1125     return retval;
1126 }
1127
1128 void object_property_set_link(Object *obj, Object *value,
1129                               const char *name, Error **errp)
1130 {
1131     if (value) {
1132         gchar *path = object_get_canonical_path(value);
1133         object_property_set_str(obj, path, name, errp);
1134         g_free(path);
1135     } else {
1136         object_property_set_str(obj, "", name, errp);
1137     }
1138 }
1139
1140 Object *object_property_get_link(Object *obj, const char *name,
1141                                  Error **errp)
1142 {
1143     char *str = object_property_get_str(obj, name, errp);
1144     Object *target = NULL;
1145
1146     if (str && *str) {
1147         target = object_resolve_path(str, NULL);
1148         if (!target) {
1149             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1150                       "Device '%s' not found", str);
1151         }
1152     }
1153
1154     g_free(str);
1155     return target;
1156 }
1157
1158 void object_property_set_bool(Object *obj, bool value,
1159                               const char *name, Error **errp)
1160 {
1161     QBool *qbool = qbool_from_bool(value);
1162     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1163
1164     QDECREF(qbool);
1165 }
1166
1167 bool object_property_get_bool(Object *obj, const char *name,
1168                               Error **errp)
1169 {
1170     QObject *ret = object_property_get_qobject(obj, name, errp);
1171     QBool *qbool;
1172     bool retval;
1173
1174     if (!ret) {
1175         return false;
1176     }
1177     qbool = qobject_to_qbool(ret);
1178     if (!qbool) {
1179         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1180         retval = false;
1181     } else {
1182         retval = qbool_get_bool(qbool);
1183     }
1184
1185     qobject_decref(ret);
1186     return retval;
1187 }
1188
1189 void object_property_set_int(Object *obj, int64_t value,
1190                              const char *name, Error **errp)
1191 {
1192     QNum *qnum = qnum_from_int(value);
1193     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1194
1195     QDECREF(qnum);
1196 }
1197
1198 int64_t object_property_get_int(Object *obj, const char *name,
1199                                 Error **errp)
1200 {
1201     QObject *ret = object_property_get_qobject(obj, name, errp);
1202     QNum *qnum;
1203     int64_t retval;
1204
1205     if (!ret) {
1206         return -1;
1207     }
1208
1209     qnum = qobject_to_qnum(ret);
1210     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1211         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1212         retval = -1;
1213     }
1214
1215     qobject_decref(ret);
1216     return retval;
1217 }
1218
1219 void object_property_set_uint(Object *obj, uint64_t value,
1220                               const char *name, Error **errp)
1221 {
1222     QNum *qnum = qnum_from_uint(value);
1223
1224     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1225     QDECREF(qnum);
1226 }
1227
1228 uint64_t object_property_get_uint(Object *obj, const char *name,
1229                                   Error **errp)
1230 {
1231     QObject *ret = object_property_get_qobject(obj, name, errp);
1232     QNum *qnum;
1233     uint64_t retval;
1234
1235     if (!ret) {
1236         return 0;
1237     }
1238     qnum = qobject_to_qnum(ret);
1239     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1240         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1241         retval = 0;
1242     }
1243
1244     qobject_decref(ret);
1245     return retval;
1246 }
1247
1248 typedef struct EnumProperty {
1249     const QEnumLookup *lookup;
1250     int (*get)(Object *, Error **);
1251     void (*set)(Object *, int, Error **);
1252 } EnumProperty;
1253
1254 int object_property_get_enum(Object *obj, const char *name,
1255                              const char *typename, Error **errp)
1256 {
1257     Error *err = NULL;
1258     Visitor *v;
1259     char *str;
1260     int ret;
1261     ObjectProperty *prop = object_property_find(obj, name, errp);
1262     EnumProperty *enumprop;
1263
1264     if (prop == NULL) {
1265         return 0;
1266     }
1267
1268     if (!g_str_equal(prop->type, typename)) {
1269         error_setg(errp, "Property %s on %s is not '%s' enum type",
1270                    name, object_class_get_name(
1271                        object_get_class(obj)), typename);
1272         return 0;
1273     }
1274
1275     enumprop = prop->opaque;
1276
1277     v = string_output_visitor_new(false, &str);
1278     object_property_get(obj, v, name, &err);
1279     if (err) {
1280         error_propagate(errp, err);
1281         visit_free(v);
1282         return 0;
1283     }
1284     visit_complete(v, &str);
1285     visit_free(v);
1286     v = string_input_visitor_new(str);
1287     visit_type_enum(v, name, &ret, enumprop->lookup, errp);
1288
1289     g_free(str);
1290     visit_free(v);
1291
1292     return ret;
1293 }
1294
1295 void object_property_get_uint16List(Object *obj, const char *name,
1296                                     uint16List **list, Error **errp)
1297 {
1298     Error *err = NULL;
1299     Visitor *v;
1300     char *str;
1301
1302     v = string_output_visitor_new(false, &str);
1303     object_property_get(obj, v, name, &err);
1304     if (err) {
1305         error_propagate(errp, err);
1306         goto out;
1307     }
1308     visit_complete(v, &str);
1309     visit_free(v);
1310     v = string_input_visitor_new(str);
1311     visit_type_uint16List(v, NULL, list, errp);
1312
1313     g_free(str);
1314 out:
1315     visit_free(v);
1316 }
1317
1318 void object_property_parse(Object *obj, const char *string,
1319                            const char *name, Error **errp)
1320 {
1321     Visitor *v = string_input_visitor_new(string);
1322     object_property_set(obj, v, name, errp);
1323     visit_free(v);
1324 }
1325
1326 char *object_property_print(Object *obj, const char *name, bool human,
1327                             Error **errp)
1328 {
1329     Visitor *v;
1330     char *string = NULL;
1331     Error *local_err = NULL;
1332
1333     v = string_output_visitor_new(human, &string);
1334     object_property_get(obj, v, name, &local_err);
1335     if (local_err) {
1336         error_propagate(errp, local_err);
1337         goto out;
1338     }
1339
1340     visit_complete(v, &string);
1341
1342 out:
1343     visit_free(v);
1344     return string;
1345 }
1346
1347 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1348 {
1349     ObjectProperty *prop = object_property_find(obj, name, errp);
1350     if (prop == NULL) {
1351         return NULL;
1352     }
1353
1354     return prop->type;
1355 }
1356
1357 Object *object_get_root(void)
1358 {
1359     static Object *root;
1360
1361     if (!root) {
1362         root = object_new("container");
1363     }
1364
1365     return root;
1366 }
1367
1368 Object *object_get_objects_root(void)
1369 {
1370     return container_get(object_get_root(), "/objects");
1371 }
1372
1373 Object *object_get_internal_root(void)
1374 {
1375     static Object *internal_root;
1376
1377     if (!internal_root) {
1378         internal_root = object_new("container");
1379     }
1380
1381     return internal_root;
1382 }
1383
1384 static void object_get_child_property(Object *obj, Visitor *v,
1385                                       const char *name, void *opaque,
1386                                       Error **errp)
1387 {
1388     Object *child = opaque;
1389     gchar *path;
1390
1391     path = object_get_canonical_path(child);
1392     visit_type_str(v, name, &path, errp);
1393     g_free(path);
1394 }
1395
1396 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1397 {
1398     return opaque;
1399 }
1400
1401 static void object_finalize_child_property(Object *obj, const char *name,
1402                                            void *opaque)
1403 {
1404     Object *child = opaque;
1405
1406     if (child->class->unparent) {
1407         (child->class->unparent)(child);
1408     }
1409     child->parent = NULL;
1410     object_unref(child);
1411 }
1412
1413 void object_property_add_child(Object *obj, const char *name,
1414                                Object *child, Error **errp)
1415 {
1416     Error *local_err = NULL;
1417     gchar *type;
1418     ObjectProperty *op;
1419
1420     if (child->parent != NULL) {
1421         error_setg(errp, "child object is already parented");
1422         return;
1423     }
1424
1425     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1426
1427     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1428                              object_finalize_child_property, child, &local_err);
1429     if (local_err) {
1430         error_propagate(errp, local_err);
1431         goto out;
1432     }
1433
1434     op->resolve = object_resolve_child_property;
1435     object_ref(child);
1436     child->parent = obj;
1437
1438 out:
1439     g_free(type);
1440 }
1441
1442 void object_property_allow_set_link(const Object *obj, const char *name,
1443                                     Object *val, Error **errp)
1444 {
1445     /* Allow the link to be set, always */
1446 }
1447
1448 typedef struct {
1449     Object **child;
1450     void (*check)(const Object *, const char *, Object *, Error **);
1451     ObjectPropertyLinkFlags flags;
1452 } LinkProperty;
1453
1454 static void object_get_link_property(Object *obj, Visitor *v,
1455                                      const char *name, void *opaque,
1456                                      Error **errp)
1457 {
1458     LinkProperty *lprop = opaque;
1459     Object **child = lprop->child;
1460     gchar *path;
1461
1462     if (*child) {
1463         path = object_get_canonical_path(*child);
1464         visit_type_str(v, name, &path, errp);
1465         g_free(path);
1466     } else {
1467         path = (gchar *)"";
1468         visit_type_str(v, name, &path, errp);
1469     }
1470 }
1471
1472 /*
1473  * object_resolve_link:
1474  *
1475  * Lookup an object and ensure its type matches the link property type.  This
1476  * is similar to object_resolve_path() except type verification against the
1477  * link property is performed.
1478  *
1479  * Returns: The matched object or NULL on path lookup failures.
1480  */
1481 static Object *object_resolve_link(Object *obj, const char *name,
1482                                    const char *path, Error **errp)
1483 {
1484     const char *type;
1485     gchar *target_type;
1486     bool ambiguous = false;
1487     Object *target;
1488
1489     /* Go from link<FOO> to FOO.  */
1490     type = object_property_get_type(obj, name, NULL);
1491     target_type = g_strndup(&type[5], strlen(type) - 6);
1492     target = object_resolve_path_type(path, target_type, &ambiguous);
1493
1494     if (ambiguous) {
1495         error_setg(errp, "Path '%s' does not uniquely identify an object",
1496                    path);
1497     } else if (!target) {
1498         target = object_resolve_path(path, &ambiguous);
1499         if (target || ambiguous) {
1500             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1501         } else {
1502             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1503                       "Device '%s' not found", path);
1504         }
1505         target = NULL;
1506     }
1507     g_free(target_type);
1508
1509     return target;
1510 }
1511
1512 static void object_set_link_property(Object *obj, Visitor *v,
1513                                      const char *name, void *opaque,
1514                                      Error **errp)
1515 {
1516     Error *local_err = NULL;
1517     LinkProperty *prop = opaque;
1518     Object **child = prop->child;
1519     Object *old_target = *child;
1520     Object *new_target = NULL;
1521     char *path = NULL;
1522
1523     visit_type_str(v, name, &path, &local_err);
1524
1525     if (!local_err && strcmp(path, "") != 0) {
1526         new_target = object_resolve_link(obj, name, path, &local_err);
1527     }
1528
1529     g_free(path);
1530     if (local_err) {
1531         error_propagate(errp, local_err);
1532         return;
1533     }
1534
1535     prop->check(obj, name, new_target, &local_err);
1536     if (local_err) {
1537         error_propagate(errp, local_err);
1538         return;
1539     }
1540
1541     object_ref(new_target);
1542     *child = new_target;
1543     object_unref(old_target);
1544 }
1545
1546 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1547 {
1548     LinkProperty *lprop = opaque;
1549
1550     return *lprop->child;
1551 }
1552
1553 static void object_release_link_property(Object *obj, const char *name,
1554                                          void *opaque)
1555 {
1556     LinkProperty *prop = opaque;
1557
1558     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1559         object_unref(*prop->child);
1560     }
1561     g_free(prop);
1562 }
1563
1564 void object_property_add_link(Object *obj, const char *name,
1565                               const char *type, Object **child,
1566                               void (*check)(const Object *, const char *,
1567                                             Object *, Error **),
1568                               ObjectPropertyLinkFlags flags,
1569                               Error **errp)
1570 {
1571     Error *local_err = NULL;
1572     LinkProperty *prop = g_malloc(sizeof(*prop));
1573     gchar *full_type;
1574     ObjectProperty *op;
1575
1576     prop->child = child;
1577     prop->check = check;
1578     prop->flags = flags;
1579
1580     full_type = g_strdup_printf("link<%s>", type);
1581
1582     op = object_property_add(obj, name, full_type,
1583                              object_get_link_property,
1584                              check ? object_set_link_property : NULL,
1585                              object_release_link_property,
1586                              prop,
1587                              &local_err);
1588     if (local_err) {
1589         error_propagate(errp, local_err);
1590         g_free(prop);
1591         goto out;
1592     }
1593
1594     op->resolve = object_resolve_link_property;
1595
1596 out:
1597     g_free(full_type);
1598 }
1599
1600 void object_property_add_const_link(Object *obj, const char *name,
1601                                     Object *target, Error **errp)
1602 {
1603     char *link_type;
1604     ObjectProperty *op;
1605
1606     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1607     op = object_property_add(obj, name, link_type,
1608                              object_get_child_property, NULL,
1609                              NULL, target, errp);
1610     if (op != NULL) {
1611         op->resolve = object_resolve_child_property;
1612     }
1613     g_free(link_type);
1614 }
1615
1616 gchar *object_get_canonical_path_component(Object *obj)
1617 {
1618     ObjectProperty *prop = NULL;
1619     GHashTableIter iter;
1620
1621     g_assert(obj);
1622     g_assert(obj->parent != NULL);
1623
1624     g_hash_table_iter_init(&iter, obj->parent->properties);
1625     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1626         if (!object_property_is_child(prop)) {
1627             continue;
1628         }
1629
1630         if (prop->opaque == obj) {
1631             return g_strdup(prop->name);
1632         }
1633     }
1634
1635     /* obj had a parent but was not a child, should never happen */
1636     g_assert_not_reached();
1637     return NULL;
1638 }
1639
1640 gchar *object_get_canonical_path(Object *obj)
1641 {
1642     Object *root = object_get_root();
1643     char *newpath, *path = NULL;
1644
1645     while (obj != root) {
1646         char *component = object_get_canonical_path_component(obj);
1647
1648         if (path) {
1649             newpath = g_strdup_printf("%s/%s", component, path);
1650             g_free(component);
1651             g_free(path);
1652             path = newpath;
1653         } else {
1654             path = component;
1655         }
1656
1657         obj = obj->parent;
1658     }
1659
1660     newpath = g_strdup_printf("/%s", path ? path : "");
1661     g_free(path);
1662
1663     return newpath;
1664 }
1665
1666 Object *object_resolve_path_component(Object *parent, const gchar *part)
1667 {
1668     ObjectProperty *prop = object_property_find(parent, part, NULL);
1669     if (prop == NULL) {
1670         return NULL;
1671     }
1672
1673     if (prop->resolve) {
1674         return prop->resolve(parent, prop->opaque, part);
1675     } else {
1676         return NULL;
1677     }
1678 }
1679
1680 static Object *object_resolve_abs_path(Object *parent,
1681                                           gchar **parts,
1682                                           const char *typename,
1683                                           int index)
1684 {
1685     Object *child;
1686
1687     if (parts[index] == NULL) {
1688         return object_dynamic_cast(parent, typename);
1689     }
1690
1691     if (strcmp(parts[index], "") == 0) {
1692         return object_resolve_abs_path(parent, parts, typename, index + 1);
1693     }
1694
1695     child = object_resolve_path_component(parent, parts[index]);
1696     if (!child) {
1697         return NULL;
1698     }
1699
1700     return object_resolve_abs_path(child, parts, typename, index + 1);
1701 }
1702
1703 static Object *object_resolve_partial_path(Object *parent,
1704                                               gchar **parts,
1705                                               const char *typename,
1706                                               bool *ambiguous)
1707 {
1708     Object *obj;
1709     GHashTableIter iter;
1710     ObjectProperty *prop;
1711
1712     obj = object_resolve_abs_path(parent, parts, typename, 0);
1713
1714     g_hash_table_iter_init(&iter, parent->properties);
1715     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1716         Object *found;
1717
1718         if (!object_property_is_child(prop)) {
1719             continue;
1720         }
1721
1722         found = object_resolve_partial_path(prop->opaque, parts,
1723                                             typename, ambiguous);
1724         if (found) {
1725             if (obj) {
1726                 *ambiguous = true;
1727                 return NULL;
1728             }
1729             obj = found;
1730         }
1731
1732         if (*ambiguous) {
1733             return NULL;
1734         }
1735     }
1736
1737     return obj;
1738 }
1739
1740 Object *object_resolve_path_type(const char *path, const char *typename,
1741                                  bool *ambiguousp)
1742 {
1743     Object *obj;
1744     gchar **parts;
1745
1746     parts = g_strsplit(path, "/", 0);
1747     assert(parts);
1748
1749     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1750         bool ambiguous = false;
1751         obj = object_resolve_partial_path(object_get_root(), parts,
1752                                           typename, &ambiguous);
1753         if (ambiguousp) {
1754             *ambiguousp = ambiguous;
1755         }
1756     } else {
1757         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1758     }
1759
1760     g_strfreev(parts);
1761
1762     return obj;
1763 }
1764
1765 Object *object_resolve_path(const char *path, bool *ambiguous)
1766 {
1767     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1768 }
1769
1770 typedef struct StringProperty
1771 {
1772     char *(*get)(Object *, Error **);
1773     void (*set)(Object *, const char *, Error **);
1774 } StringProperty;
1775
1776 static void property_get_str(Object *obj, Visitor *v, const char *name,
1777                              void *opaque, Error **errp)
1778 {
1779     StringProperty *prop = opaque;
1780     char *value;
1781     Error *err = NULL;
1782
1783     value = prop->get(obj, &err);
1784     if (err) {
1785         error_propagate(errp, err);
1786         return;
1787     }
1788
1789     visit_type_str(v, name, &value, errp);
1790     g_free(value);
1791 }
1792
1793 static void property_set_str(Object *obj, Visitor *v, const char *name,
1794                              void *opaque, Error **errp)
1795 {
1796     StringProperty *prop = opaque;
1797     char *value;
1798     Error *local_err = NULL;
1799
1800     visit_type_str(v, name, &value, &local_err);
1801     if (local_err) {
1802         error_propagate(errp, local_err);
1803         return;
1804     }
1805
1806     prop->set(obj, value, errp);
1807     g_free(value);
1808 }
1809
1810 static void property_release_str(Object *obj, const char *name,
1811                                  void *opaque)
1812 {
1813     StringProperty *prop = opaque;
1814     g_free(prop);
1815 }
1816
1817 void object_property_add_str(Object *obj, const char *name,
1818                            char *(*get)(Object *, Error **),
1819                            void (*set)(Object *, const char *, Error **),
1820                            Error **errp)
1821 {
1822     Error *local_err = NULL;
1823     StringProperty *prop = g_malloc0(sizeof(*prop));
1824
1825     prop->get = get;
1826     prop->set = set;
1827
1828     object_property_add(obj, name, "string",
1829                         get ? property_get_str : NULL,
1830                         set ? property_set_str : NULL,
1831                         property_release_str,
1832                         prop, &local_err);
1833     if (local_err) {
1834         error_propagate(errp, local_err);
1835         g_free(prop);
1836     }
1837 }
1838
1839 void object_class_property_add_str(ObjectClass *klass, const char *name,
1840                                    char *(*get)(Object *, Error **),
1841                                    void (*set)(Object *, const char *,
1842                                                Error **),
1843                                    Error **errp)
1844 {
1845     Error *local_err = NULL;
1846     StringProperty *prop = g_malloc0(sizeof(*prop));
1847
1848     prop->get = get;
1849     prop->set = set;
1850
1851     object_class_property_add(klass, name, "string",
1852                               get ? property_get_str : NULL,
1853                               set ? property_set_str : NULL,
1854                               property_release_str,
1855                               prop, &local_err);
1856     if (local_err) {
1857         error_propagate(errp, local_err);
1858         g_free(prop);
1859     }
1860 }
1861
1862 typedef struct BoolProperty
1863 {
1864     bool (*get)(Object *, Error **);
1865     void (*set)(Object *, bool, Error **);
1866 } BoolProperty;
1867
1868 static void property_get_bool(Object *obj, Visitor *v, const char *name,
1869                               void *opaque, Error **errp)
1870 {
1871     BoolProperty *prop = opaque;
1872     bool value;
1873     Error *err = NULL;
1874
1875     value = prop->get(obj, &err);
1876     if (err) {
1877         error_propagate(errp, err);
1878         return;
1879     }
1880
1881     visit_type_bool(v, name, &value, errp);
1882 }
1883
1884 static void property_set_bool(Object *obj, Visitor *v, const char *name,
1885                               void *opaque, Error **errp)
1886 {
1887     BoolProperty *prop = opaque;
1888     bool value;
1889     Error *local_err = NULL;
1890
1891     visit_type_bool(v, name, &value, &local_err);
1892     if (local_err) {
1893         error_propagate(errp, local_err);
1894         return;
1895     }
1896
1897     prop->set(obj, value, errp);
1898 }
1899
1900 static void property_release_bool(Object *obj, const char *name,
1901                                   void *opaque)
1902 {
1903     BoolProperty *prop = opaque;
1904     g_free(prop);
1905 }
1906
1907 void object_property_add_bool(Object *obj, const char *name,
1908                               bool (*get)(Object *, Error **),
1909                               void (*set)(Object *, bool, Error **),
1910                               Error **errp)
1911 {
1912     Error *local_err = NULL;
1913     BoolProperty *prop = g_malloc0(sizeof(*prop));
1914
1915     prop->get = get;
1916     prop->set = set;
1917
1918     object_property_add(obj, name, "bool",
1919                         get ? property_get_bool : NULL,
1920                         set ? property_set_bool : NULL,
1921                         property_release_bool,
1922                         prop, &local_err);
1923     if (local_err) {
1924         error_propagate(errp, local_err);
1925         g_free(prop);
1926     }
1927 }
1928
1929 void object_class_property_add_bool(ObjectClass *klass, const char *name,
1930                                     bool (*get)(Object *, Error **),
1931                                     void (*set)(Object *, bool, Error **),
1932                                     Error **errp)
1933 {
1934     Error *local_err = NULL;
1935     BoolProperty *prop = g_malloc0(sizeof(*prop));
1936
1937     prop->get = get;
1938     prop->set = set;
1939
1940     object_class_property_add(klass, name, "bool",
1941                               get ? property_get_bool : NULL,
1942                               set ? property_set_bool : NULL,
1943                               property_release_bool,
1944                               prop, &local_err);
1945     if (local_err) {
1946         error_propagate(errp, local_err);
1947         g_free(prop);
1948     }
1949 }
1950
1951 static void property_get_enum(Object *obj, Visitor *v, const char *name,
1952                               void *opaque, Error **errp)
1953 {
1954     EnumProperty *prop = opaque;
1955     int value;
1956     Error *err = NULL;
1957
1958     value = prop->get(obj, &err);
1959     if (err) {
1960         error_propagate(errp, err);
1961         return;
1962     }
1963
1964     visit_type_enum(v, name, &value, prop->lookup, errp);
1965 }
1966
1967 static void property_set_enum(Object *obj, Visitor *v, const char *name,
1968                               void *opaque, Error **errp)
1969 {
1970     EnumProperty *prop = opaque;
1971     int value;
1972     Error *err = NULL;
1973
1974     visit_type_enum(v, name, &value, prop->lookup, &err);
1975     if (err) {
1976         error_propagate(errp, err);
1977         return;
1978     }
1979     prop->set(obj, value, errp);
1980 }
1981
1982 static void property_release_enum(Object *obj, const char *name,
1983                                   void *opaque)
1984 {
1985     EnumProperty *prop = opaque;
1986     g_free(prop);
1987 }
1988
1989 void object_property_add_enum(Object *obj, const char *name,
1990                               const char *typename,
1991                               const QEnumLookup *lookup,
1992                               int (*get)(Object *, Error **),
1993                               void (*set)(Object *, int, Error **),
1994                               Error **errp)
1995 {
1996     Error *local_err = NULL;
1997     EnumProperty *prop = g_malloc(sizeof(*prop));
1998
1999     prop->lookup = lookup;
2000     prop->get = get;
2001     prop->set = set;
2002
2003     object_property_add(obj, name, typename,
2004                         get ? property_get_enum : NULL,
2005                         set ? property_set_enum : NULL,
2006                         property_release_enum,
2007                         prop, &local_err);
2008     if (local_err) {
2009         error_propagate(errp, local_err);
2010         g_free(prop);
2011     }
2012 }
2013
2014 void object_class_property_add_enum(ObjectClass *klass, const char *name,
2015                                     const char *typename,
2016                                     const QEnumLookup *lookup,
2017                                     int (*get)(Object *, Error **),
2018                                     void (*set)(Object *, int, Error **),
2019                                     Error **errp)
2020 {
2021     Error *local_err = NULL;
2022     EnumProperty *prop = g_malloc(sizeof(*prop));
2023
2024     prop->lookup = lookup;
2025     prop->get = get;
2026     prop->set = set;
2027
2028     object_class_property_add(klass, name, typename,
2029                               get ? property_get_enum : NULL,
2030                               set ? property_set_enum : NULL,
2031                               property_release_enum,
2032                               prop, &local_err);
2033     if (local_err) {
2034         error_propagate(errp, local_err);
2035         g_free(prop);
2036     }
2037 }
2038
2039 typedef struct TMProperty {
2040     void (*get)(Object *, struct tm *, Error **);
2041 } TMProperty;
2042
2043 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2044                             void *opaque, Error **errp)
2045 {
2046     TMProperty *prop = opaque;
2047     Error *err = NULL;
2048     struct tm value;
2049
2050     prop->get(obj, &value, &err);
2051     if (err) {
2052         goto out;
2053     }
2054
2055     visit_start_struct(v, name, NULL, 0, &err);
2056     if (err) {
2057         goto out;
2058     }
2059     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2060     if (err) {
2061         goto out_end;
2062     }
2063     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2064     if (err) {
2065         goto out_end;
2066     }
2067     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2068     if (err) {
2069         goto out_end;
2070     }
2071     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2072     if (err) {
2073         goto out_end;
2074     }
2075     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2076     if (err) {
2077         goto out_end;
2078     }
2079     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2080     if (err) {
2081         goto out_end;
2082     }
2083     visit_check_struct(v, &err);
2084 out_end:
2085     visit_end_struct(v, NULL);
2086 out:
2087     error_propagate(errp, err);
2088
2089 }
2090
2091 static void property_release_tm(Object *obj, const char *name,
2092                                 void *opaque)
2093 {
2094     TMProperty *prop = opaque;
2095     g_free(prop);
2096 }
2097
2098 void object_property_add_tm(Object *obj, const char *name,
2099                             void (*get)(Object *, struct tm *, Error **),
2100                             Error **errp)
2101 {
2102     Error *local_err = NULL;
2103     TMProperty *prop = g_malloc0(sizeof(*prop));
2104
2105     prop->get = get;
2106
2107     object_property_add(obj, name, "struct tm",
2108                         get ? property_get_tm : NULL, NULL,
2109                         property_release_tm,
2110                         prop, &local_err);
2111     if (local_err) {
2112         error_propagate(errp, local_err);
2113         g_free(prop);
2114     }
2115 }
2116
2117 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2118                                   void (*get)(Object *, struct tm *, Error **),
2119                                   Error **errp)
2120 {
2121     Error *local_err = NULL;
2122     TMProperty *prop = g_malloc0(sizeof(*prop));
2123
2124     prop->get = get;
2125
2126     object_class_property_add(klass, name, "struct tm",
2127                               get ? property_get_tm : NULL, NULL,
2128                               property_release_tm,
2129                               prop, &local_err);
2130     if (local_err) {
2131         error_propagate(errp, local_err);
2132         g_free(prop);
2133     }
2134 }
2135
2136 static char *qdev_get_type(Object *obj, Error **errp)
2137 {
2138     return g_strdup(object_get_typename(obj));
2139 }
2140
2141 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2142                                    void *opaque, Error **errp)
2143 {
2144     uint8_t value = *(uint8_t *)opaque;
2145     visit_type_uint8(v, name, &value, errp);
2146 }
2147
2148 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2149                                     void *opaque, Error **errp)
2150 {
2151     uint16_t value = *(uint16_t *)opaque;
2152     visit_type_uint16(v, name, &value, errp);
2153 }
2154
2155 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2156                                     void *opaque, Error **errp)
2157 {
2158     uint32_t value = *(uint32_t *)opaque;
2159     visit_type_uint32(v, name, &value, errp);
2160 }
2161
2162 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2163                                     void *opaque, Error **errp)
2164 {
2165     uint64_t value = *(uint64_t *)opaque;
2166     visit_type_uint64(v, name, &value, errp);
2167 }
2168
2169 void object_property_add_uint8_ptr(Object *obj, const char *name,
2170                                    const uint8_t *v, Error **errp)
2171 {
2172     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2173                         NULL, NULL, (void *)v, errp);
2174 }
2175
2176 void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2177                                          const uint8_t *v, Error **errp)
2178 {
2179     object_class_property_add(klass, name, "uint8", property_get_uint8_ptr,
2180                               NULL, NULL, (void *)v, errp);
2181 }
2182
2183 void object_property_add_uint16_ptr(Object *obj, const char *name,
2184                                     const uint16_t *v, Error **errp)
2185 {
2186     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2187                         NULL, NULL, (void *)v, errp);
2188 }
2189
2190 void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2191                                           const uint16_t *v, Error **errp)
2192 {
2193     object_class_property_add(klass, name, "uint16", property_get_uint16_ptr,
2194                               NULL, NULL, (void *)v, errp);
2195 }
2196
2197 void object_property_add_uint32_ptr(Object *obj, const char *name,
2198                                     const uint32_t *v, Error **errp)
2199 {
2200     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2201                         NULL, NULL, (void *)v, errp);
2202 }
2203
2204 void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2205                                           const uint32_t *v, Error **errp)
2206 {
2207     object_class_property_add(klass, name, "uint32", property_get_uint32_ptr,
2208                               NULL, NULL, (void *)v, errp);
2209 }
2210
2211 void object_property_add_uint64_ptr(Object *obj, const char *name,
2212                                     const uint64_t *v, Error **errp)
2213 {
2214     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2215                         NULL, NULL, (void *)v, errp);
2216 }
2217
2218 void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2219                                           const uint64_t *v, Error **errp)
2220 {
2221     object_class_property_add(klass, name, "uint64", property_get_uint64_ptr,
2222                               NULL, NULL, (void *)v, errp);
2223 }
2224
2225 typedef struct {
2226     Object *target_obj;
2227     char *target_name;
2228 } AliasProperty;
2229
2230 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2231                                void *opaque, Error **errp)
2232 {
2233     AliasProperty *prop = opaque;
2234
2235     object_property_get(prop->target_obj, v, prop->target_name, errp);
2236 }
2237
2238 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2239                                void *opaque, Error **errp)
2240 {
2241     AliasProperty *prop = opaque;
2242
2243     object_property_set(prop->target_obj, v, prop->target_name, errp);
2244 }
2245
2246 static Object *property_resolve_alias(Object *obj, void *opaque,
2247                                       const gchar *part)
2248 {
2249     AliasProperty *prop = opaque;
2250
2251     return object_resolve_path_component(prop->target_obj, prop->target_name);
2252 }
2253
2254 static void property_release_alias(Object *obj, const char *name, void *opaque)
2255 {
2256     AliasProperty *prop = opaque;
2257
2258     g_free(prop->target_name);
2259     g_free(prop);
2260 }
2261
2262 void object_property_add_alias(Object *obj, const char *name,
2263                                Object *target_obj, const char *target_name,
2264                                Error **errp)
2265 {
2266     AliasProperty *prop;
2267     ObjectProperty *op;
2268     ObjectProperty *target_prop;
2269     gchar *prop_type;
2270     Error *local_err = NULL;
2271
2272     target_prop = object_property_find(target_obj, target_name, errp);
2273     if (!target_prop) {
2274         return;
2275     }
2276
2277     if (object_property_is_child(target_prop)) {
2278         prop_type = g_strdup_printf("link%s",
2279                                     target_prop->type + strlen("child"));
2280     } else {
2281         prop_type = g_strdup(target_prop->type);
2282     }
2283
2284     prop = g_malloc(sizeof(*prop));
2285     prop->target_obj = target_obj;
2286     prop->target_name = g_strdup(target_name);
2287
2288     op = object_property_add(obj, name, prop_type,
2289                              property_get_alias,
2290                              property_set_alias,
2291                              property_release_alias,
2292                              prop, &local_err);
2293     if (local_err) {
2294         error_propagate(errp, local_err);
2295         g_free(prop);
2296         goto out;
2297     }
2298     op->resolve = property_resolve_alias;
2299
2300     object_property_set_description(obj, op->name,
2301                                     target_prop->description,
2302                                     &error_abort);
2303
2304 out:
2305     g_free(prop_type);
2306 }
2307
2308 void object_property_set_description(Object *obj, const char *name,
2309                                      const char *description, Error **errp)
2310 {
2311     ObjectProperty *op;
2312
2313     op = object_property_find(obj, name, errp);
2314     if (!op) {
2315         return;
2316     }
2317
2318     g_free(op->description);
2319     op->description = g_strdup(description);
2320 }
2321
2322 void object_class_property_set_description(ObjectClass *klass,
2323                                            const char *name,
2324                                            const char *description,
2325                                            Error **errp)
2326 {
2327     ObjectProperty *op;
2328
2329     op = g_hash_table_lookup(klass->properties, name);
2330     if (!op) {
2331         error_setg(errp, "Property '.%s' not found", name);
2332         return;
2333     }
2334
2335     g_free(op->description);
2336     op->description = g_strdup(description);
2337 }
2338
2339 static void object_instance_init(Object *obj)
2340 {
2341     object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
2342 }
2343
2344 static void register_types(void)
2345 {
2346     static TypeInfo interface_info = {
2347         .name = TYPE_INTERFACE,
2348         .class_size = sizeof(InterfaceClass),
2349         .abstract = true,
2350     };
2351
2352     static TypeInfo object_info = {
2353         .name = TYPE_OBJECT,
2354         .instance_size = sizeof(Object),
2355         .instance_init = object_instance_init,
2356         .abstract = true,
2357     };
2358
2359     type_interface = type_register_internal(&interface_info);
2360     type_register_internal(&object_info);
2361 }
2362
2363 type_init(register_types)