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 "qom/object.h"
  14 #include "qom/object_interfaces.h"
  15 #include "qemu-common.h"
  16 #include "qapi/visitor.h"
  17 #include "qapi-visit.h"
  18 #include "qapi/string-input-visitor.h"
  19 #include "qapi/string-output-visitor.h"
  20 #include "qapi/qmp/qerror.h"
  21 #include "trace.h"
  22
  23 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  24  * of the QOM core on QObject?  */
  25 #include "qom/qom-qobject.h"
  26 #include "qapi/qmp/qobject.h"
  27 #include "qapi/qmp/qbool.h"
  28 #include "qapi/qmp/qint.h"
  29 #include "qapi/qmp/qstring.h"
  30
  31 #define MAX_INTERFACES 32
  32
  33 typedef struct InterfaceImpl InterfaceImpl;
  34 typedef struct TypeImpl TypeImpl;
  35
  36 struct InterfaceImpl
  37 {
  38     const char *typename;
  39 };
  40
  41 struct TypeImpl
  42 {
  43     const char *name;
  44
  45     size_t class_size;
  46
  47     size_t instance_size;
  48
  49     void (*class_init)(ObjectClass *klass, void *data);
  50     void (*class_base_init)(ObjectClass *klass, void *data);
  51     void (*class_finalize)(ObjectClass *klass, void *data);
  52
  53     void *class_data;
  54
  55     void (*instance_init)(Object *obj);
  56     void (*instance_post_init)(Object *obj);
  57     void (*instance_finalize)(Object *obj);
  58
  59     bool abstract;
  60
  61     const char *parent;
  62     TypeImpl *parent_type;
  63
  64     ObjectClass *class;
  65
  66     int num_interfaces;
  67     InterfaceImpl interfaces[MAX_INTERFACES];
  68 };
  69
  70 struct ObjectPropertyIterator {
  71     ObjectProperty *next;
  72 };
  73
  74 static Type type_interface;
  75
  76 static GHashTable *type_table_get(void)
  77 {
  78     static GHashTable *type_table;
  79
  80     if (type_table == NULL) {
  81         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  82     }
  83
  84     return type_table;
  85 }
  86
  87 static bool enumerating_types;
  88
  89 static void type_table_add(TypeImpl *ti)
  90 {
  91     assert(!enumerating_types);
  92     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  93 }
  94
  95 static TypeImpl *type_table_lookup(const char *name)
  96 {
  97     return g_hash_table_lookup(type_table_get(), name);
  98 }
  99
 100 static TypeImpl *type_new(const TypeInfo *info)
 101 {
 102     TypeImpl *ti = g_malloc0(sizeof(*ti));
 103     int i;
 104
 105     g_assert(info->name != NULL);
 106
 107     if (type_table_lookup(info->name) != NULL) {
 108         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 109         abort();
 110     }
 111
 112     ti->name = g_strdup(info->name);
 113     ti->parent = g_strdup(info->parent);
 114
 115     ti->class_size = info->class_size;
 116     ti->instance_size = info->instance_size;
 117
 118     ti->class_init = info->class_init;
 119     ti->class_base_init = info->class_base_init;
 120     ti->class_finalize = info->class_finalize;
 121     ti->class_data = info->class_data;
 122
 123     ti->instance_init = info->instance_init;
 124     ti->instance_post_init = info->instance_post_init;
 125     ti->instance_finalize = info->instance_finalize;
 126
 127     ti->abstract = info->abstract;
 128
 129     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 130         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 131     }
 132     ti->num_interfaces = i;
 133
 134     return ti;
 135 }
 136
 137 static TypeImpl *type_register_internal(const TypeInfo *info)
 138 {
 139     TypeImpl *ti;
 140     ti = type_new(info);
 141
 142     type_table_add(ti);
 143     return ti;
 144 }
 145
 146 TypeImpl *type_register(const TypeInfo *info)
 147 {
 148     assert(info->parent);
 149     return type_register_internal(info);
 150 }
 151
 152 TypeImpl *type_register_static(const TypeInfo *info)
 153 {
 154     return type_register(info);
 155 }
 156
 157 static TypeImpl *type_get_by_name(const char *name)
 158 {
 159     if (name == NULL) {
 160         return NULL;
 161     }
 162
 163     return type_table_lookup(name);
 164 }
 165
 166 static TypeImpl *type_get_parent(TypeImpl *type)
 167 {
 168     if (!type->parent_type && type->parent) {
 169         type->parent_type = type_get_by_name(type->parent);
 170         g_assert(type->parent_type != NULL);
 171     }
 172
 173     return type->parent_type;
 174 }
 175
 176 static bool type_has_parent(TypeImpl *type)
 177 {
 178     return (type->parent != NULL);
 179 }
 180
 181 static size_t type_class_get_size(TypeImpl *ti)
 182 {
 183     if (ti->class_size) {
 184         return ti->class_size;
 185     }
 186
 187     if (type_has_parent(ti)) {
 188         return type_class_get_size(type_get_parent(ti));
 189     }
 190
 191     return sizeof(ObjectClass);
 192 }
 193
 194 static size_t type_object_get_size(TypeImpl *ti)
 195 {
 196     if (ti->instance_size) {
 197         return ti->instance_size;
 198     }
 199
 200     if (type_has_parent(ti)) {
 201         return type_object_get_size(type_get_parent(ti));
 202     }
 203
 204     return 0;
 205 }
 206
 207 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 208 {
 209     assert(target_type);
 210
 211     /* Check if target_type is a direct ancestor of type */
 212     while (type) {
 213         if (type == target_type) {
 214             return true;
 215         }
 216
 217         type = type_get_parent(type);
 218     }
 219
 220     return false;
 221 }
 222
 223 static void type_initialize(TypeImpl *ti);
 224
 225 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 226                                       TypeImpl *parent_type)
 227 {
 228     InterfaceClass *new_iface;
 229     TypeInfo info = { };
 230     TypeImpl *iface_impl;
 231
 232     info.parent = parent_type->name;
 233     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 234     info.abstract = true;
 235
 236     iface_impl = type_new(&info);
 237     iface_impl->parent_type = parent_type;
 238     type_initialize(iface_impl);
 239     g_free((char *)info.name);
 240
 241     new_iface = (InterfaceClass *)iface_impl->class;
 242     new_iface->concrete_class = ti->class;
 243     new_iface->interface_type = interface_type;
 244
 245     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 246                                            iface_impl->class);
 247 }
 248
 249 static void type_initialize(TypeImpl *ti)
 250 {
 251     TypeImpl *parent;
 252
 253     if (ti->class) {
 254         return;
 255     }
 256
 257     ti->class_size = type_class_get_size(ti);
 258     ti->instance_size = type_object_get_size(ti);
 259
 260     ti->class = g_malloc0(ti->class_size);
 261
 262     parent = type_get_parent(ti);
 263     if (parent) {
 264         type_initialize(parent);
 265         GSList *e;
 266         int i;
 267
 268         g_assert(parent->class_size <= ti->class_size);
 269         memcpy(ti->class, parent->class, parent->class_size);
 270         ti->class->interfaces = NULL;
 271
 272         for (e = parent->class->interfaces; e; e = e->next) {
 273             InterfaceClass *iface = e->data;
 274             ObjectClass *klass = OBJECT_CLASS(iface);
 275
 276             type_initialize_interface(ti, iface->interface_type, klass->type);
 277         }
 278
 279         for (i = 0; i < ti->num_interfaces; i++) {
 280             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 281             for (e = ti->class->interfaces; e; e = e->next) {
 282                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 283
 284                 if (type_is_ancestor(target_type, t)) {
 285                     break;
 286                 }
 287             }
 288
 289             if (e) {
 290                 continue;
 291             }
 292
 293             type_initialize_interface(ti, t, t);
 294         }
 295     }
 296
 297     ti->class->type = ti;
 298
 299     while (parent) {
 300         if (parent->class_base_init) {
 301             parent->class_base_init(ti->class, ti->class_data);
 302         }
 303         parent = type_get_parent(parent);
 304     }
 305
 306     if (ti->class_init) {
 307         ti->class_init(ti->class, ti->class_data);
 308     }
 309 }
 310
 311 static void object_init_with_type(Object *obj, TypeImpl *ti)
 312 {
 313     if (type_has_parent(ti)) {
 314         object_init_with_type(obj, type_get_parent(ti));
 315     }
 316
 317     if (ti->instance_init) {
 318         ti->instance_init(obj);
 319     }
 320 }
 321
 322 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 323 {
 324     if (ti->instance_post_init) {
 325         ti->instance_post_init(obj);
 326     }
 327
 328     if (type_has_parent(ti)) {
 329         object_post_init_with_type(obj, type_get_parent(ti));
 330     }
 331 }
 332
 333 void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 334 {
 335     Object *obj = data;
 336
 337     g_assert(type != NULL);
 338     type_initialize(type);
 339
 340     g_assert(type->instance_size >= sizeof(Object));
 341     g_assert(type->abstract == false);
 342     g_assert(size >= type->instance_size);
 343
 344     memset(obj, 0, type->instance_size);
 345     obj->class = type->class;
 346     object_ref(obj);
 347     QTAILQ_INIT(&obj->properties);
 348     object_init_with_type(obj, type);
 349     object_post_init_with_type(obj, type);
 350 }
 351
 352 void object_initialize(void *data, size_t size, const char *typename)
 353 {
 354     TypeImpl *type = type_get_by_name(typename);
 355
 356     object_initialize_with_type(data, size, type);
 357 }
 358
 359 static inline bool object_property_is_child(ObjectProperty *prop)
 360 {
 361     return strstart(prop->type, "child<", NULL);
 362 }
 363
 364 static void object_property_del_all(Object *obj)
 365 {
 366     while (!QTAILQ_EMPTY(&obj->properties)) {
 367         ObjectProperty *prop = QTAILQ_FIRST(&obj->properties);
 368
 369         QTAILQ_REMOVE(&obj->properties, prop, node);
 370
 371         if (prop->release) {
 372             prop->release(obj, prop->name, prop->opaque);
 373         }
 374
 375         g_free(prop->name);
 376         g_free(prop->type);
 377         g_free(prop->description);
 378         g_free(prop);
 379     }
 380 }
 381
 382 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 383 {
 384     ObjectProperty *prop;
 385
 386     QTAILQ_FOREACH(prop, &obj->properties, node) {
 387         if (object_property_is_child(prop) && prop->opaque == child) {
 388             object_property_del(obj, prop->name, errp);
 389             break;
 390         }
 391     }
 392 }
 393
 394 void object_unparent(Object *obj)
 395 {
 396     if (obj->parent) {
 397         object_property_del_child(obj->parent, obj, NULL);
 398     }
 399 }
 400
 401 static void object_deinit(Object *obj, TypeImpl *type)
 402 {
 403     if (type->instance_finalize) {
 404         type->instance_finalize(obj);
 405     }
 406
 407     if (type_has_parent(type)) {
 408         object_deinit(obj, type_get_parent(type));
 409     }
 410 }
 411
 412 static void object_finalize(void *data)
 413 {
 414     Object *obj = data;
 415     TypeImpl *ti = obj->class->type;
 416
 417     object_property_del_all(obj);
 418     object_deinit(obj, ti);
 419
 420     g_assert(obj->ref == 0);
 421     if (obj->free) {
 422         obj->free(obj);
 423     }
 424 }
 425
 426 Object *object_new_with_type(Type type)
 427 {
 428     Object *obj;
 429
 430     g_assert(type != NULL);
 431     type_initialize(type);
 432
 433     obj = g_malloc(type->instance_size);
 434     object_initialize_with_type(obj, type->instance_size, type);
 435     obj->free = g_free;
 436
 437     return obj;
 438 }
 439
 440 Object *object_new(const char *typename)
 441 {
 442     TypeImpl *ti = type_get_by_name(typename);
 443
 444     return object_new_with_type(ti);
 445 }
 446
 447
 448 Object *object_new_with_props(const char *typename,
 449                               Object *parent,
 450                               const char *id,
 451                               Error **errp,
 452                               ...)
 453 {
 454     va_list vargs;
 455     Object *obj;
 456
 457     va_start(vargs, errp);
 458     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 459     va_end(vargs);
 460
 461     return obj;
 462 }
 463
 464
 465 Object *object_new_with_propv(const char *typename,
 466                               Object *parent,
 467                               const char *id,
 468                               Error **errp,
 469                               va_list vargs)
 470 {
 471     Object *obj;
 472     ObjectClass *klass;
 473     Error *local_err = NULL;
 474
 475     klass = object_class_by_name(typename);
 476     if (!klass) {
 477         error_setg(errp, "invalid object type: %s", typename);
 478         return NULL;
 479     }
 480
 481     if (object_class_is_abstract(klass)) {
 482         error_setg(errp, "object type '%s' is abstract", typename);
 483         return NULL;
 484     }
 485     obj = object_new(typename);
 486
 487     if (object_set_propv(obj, &local_err, vargs) < 0) {
 488         goto error;
 489     }
 490
 491     object_property_add_child(parent, id, obj, &local_err);
 492     if (local_err) {
 493         goto error;
 494     }
 495
 496     if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
 497         user_creatable_complete(obj, &local_err);
 498         if (local_err) {
 499             object_unparent(obj);
 500             goto error;
 501         }
 502     }
 503
 504     object_unref(OBJECT(obj));
 505     return obj;
 506
 507  error:
 508     if (local_err) {
 509         error_propagate(errp, local_err);
 510     }
 511     object_unref(obj);
 512     return NULL;
 513 }
 514
 515
 516 int object_set_props(Object *obj,
 517                      Error **errp,
 518                      ...)
 519 {
 520     va_list vargs;
 521     int ret;
 522
 523     va_start(vargs, errp);
 524     ret = object_set_propv(obj, errp, vargs);
 525     va_end(vargs);
 526
 527     return ret;
 528 }
 529
 530
 531 int object_set_propv(Object *obj,
 532                      Error **errp,
 533                      va_list vargs)
 534 {
 535     const char *propname;
 536     Error *local_err = NULL;
 537
 538     propname = va_arg(vargs, char *);
 539     while (propname != NULL) {
 540         const char *value = va_arg(vargs, char *);
 541
 542         g_assert(value != NULL);
 543         object_property_parse(obj, value, propname, &local_err);
 544         if (local_err) {
 545             error_propagate(errp, local_err);
 546             return -1;
 547         }
 548         propname = va_arg(vargs, char *);
 549     }
 550
 551     return 0;
 552 }
 553
 554
 555 Object *object_dynamic_cast(Object *obj, const char *typename)
 556 {
 557     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 558         return obj;
 559     }
 560
 561     return NULL;
 562 }
 563
 564 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 565                                    const char *file, int line, const char *func)
 566 {
 567     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 568                                      typename, file, line, func);
 569
 570 #ifdef CONFIG_QOM_CAST_DEBUG
 571     int i;
 572     Object *inst;
 573
 574     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 575         if (obj->class->object_cast_cache[i] == typename) {
 576             goto out;
 577         }
 578     }
 579
 580     inst = object_dynamic_cast(obj, typename);
 581
 582     if (!inst && obj) {
 583         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 584                 file, line, func, obj, typename);
 585         abort();
 586     }
 587
 588     assert(obj == inst);
 589
 590     if (obj && obj == inst) {
 591         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 592             obj->class->object_cast_cache[i - 1] =
 593                     obj->class->object_cast_cache[i];
 594         }
 595         obj->class->object_cast_cache[i - 1] = typename;
 596     }
 597
 598 out:
 599 #endif
 600     return obj;
 601 }
 602
 603 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 604                                        const char *typename)
 605 {
 606     ObjectClass *ret = NULL;
 607     TypeImpl *target_type;
 608     TypeImpl *type;
 609
 610     if (!class) {
 611         return NULL;
 612     }
 613
 614     /* A simple fast path that can trigger a lot for leaf classes.  */
 615     type = class->type;
 616     if (type->name == typename) {
 617         return class;
 618     }
 619
 620     target_type = type_get_by_name(typename);
 621     if (!target_type) {
 622         /* target class type unknown, so fail the cast */
 623         return NULL;
 624     }
 625
 626     if (type->class->interfaces &&
 627             type_is_ancestor(target_type, type_interface)) {
 628         int found = 0;
 629         GSList *i;
 630
 631         for (i = class->interfaces; i; i = i->next) {
 632             ObjectClass *target_class = i->data;
 633
 634             if (type_is_ancestor(target_class->type, target_type)) {
 635                 ret = target_class;
 636                 found++;
 637             }
 638          }
 639
 640         /* The match was ambiguous, don't allow a cast */
 641         if (found > 1) {
 642             ret = NULL;
 643         }
 644     } else if (type_is_ancestor(type, target_type)) {
 645         ret = class;
 646     }
 647
 648     return ret;
 649 }
 650
 651 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 652                                               const char *typename,
 653                                               const char *file, int line,
 654                                               const char *func)
 655 {
 656     ObjectClass *ret;
 657
 658     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 659                                            typename, file, line, func);
 660
 661 #ifdef CONFIG_QOM_CAST_DEBUG
 662     int i;
 663
 664     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 665         if (class->class_cast_cache[i] == typename) {
 666             ret = class;
 667             goto out;
 668         }
 669     }
 670 #else
 671     if (!class || !class->interfaces) {
 672         return class;
 673     }
 674 #endif
 675
 676     ret = object_class_dynamic_cast(class, typename);
 677     if (!ret && class) {
 678         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 679                 file, line, func, class, typename);
 680         abort();
 681     }
 682
 683 #ifdef CONFIG_QOM_CAST_DEBUG
 684     if (class && ret == class) {
 685         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 686             class->class_cast_cache[i - 1] = class->class_cast_cache[i];
 687         }
 688         class->class_cast_cache[i - 1] = typename;
 689     }
 690 out:
 691 #endif
 692     return ret;
 693 }
 694
 695 const char *object_get_typename(Object *obj)
 696 {
 697     return obj->class->type->name;
 698 }
 699
 700 ObjectClass *object_get_class(Object *obj)
 701 {
 702     return obj->class;
 703 }
 704
 705 bool object_class_is_abstract(ObjectClass *klass)
 706 {
 707     return klass->type->abstract;
 708 }
 709
 710 const char *object_class_get_name(ObjectClass *klass)
 711 {
 712     return klass->type->name;
 713 }
 714
 715 ObjectClass *object_class_by_name(const char *typename)
 716 {
 717     TypeImpl *type = type_get_by_name(typename);
 718
 719     if (!type) {
 720         return NULL;
 721     }
 722
 723     type_initialize(type);
 724
 725     return type->class;
 726 }
 727
 728 ObjectClass *object_class_get_parent(ObjectClass *class)
 729 {
 730     TypeImpl *type = type_get_parent(class->type);
 731
 732     if (!type) {
 733         return NULL;
 734     }
 735
 736     type_initialize(type);
 737
 738     return type->class;
 739 }
 740
 741 typedef struct OCFData
 742 {
 743     void (*fn)(ObjectClass *klass, void *opaque);
 744     const char *implements_type;
 745     bool include_abstract;
 746     void *opaque;
 747 } OCFData;
 748
 749 static void object_class_foreach_tramp(gpointer key, gpointer value,
 750                                        gpointer opaque)
 751 {
 752     OCFData *data = opaque;
 753     TypeImpl *type = value;
 754     ObjectClass *k;
 755
 756     type_initialize(type);
 757     k = type->class;
 758
 759     if (!data->include_abstract && type->abstract) {
 760         return;
 761     }
 762
 763     if (data->implements_type &&
 764         !object_class_dynamic_cast(k, data->implements_type)) {
 765         return;
 766     }
 767
 768     data->fn(k, data->opaque);
 769 }
 770
 771 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 772                           const char *implements_type, bool include_abstract,
 773                           void *opaque)
 774 {
 775     OCFData data = { fn, implements_type, include_abstract, opaque };
 776
 777     enumerating_types = true;
 778     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 779     enumerating_types = false;
 780 }
 781
 782 static int do_object_child_foreach(Object *obj,
 783                                    int (*fn)(Object *child, void *opaque),
 784                                    void *opaque, bool recurse)
 785 {
 786     ObjectProperty *prop, *next;
 787     int ret = 0;
 788
 789     QTAILQ_FOREACH_SAFE(prop, &obj->properties, node, next) {
 790         if (object_property_is_child(prop)) {
 791             Object *child = prop->opaque;
 792
 793             ret = fn(child, opaque);
 794             if (ret != 0) {
 795                 break;
 796             }
 797             if (recurse) {
 798                 do_object_child_foreach(child, fn, opaque, true);
 799             }
 800         }
 801     }
 802     return ret;
 803 }
 804
 805 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 806                          void *opaque)
 807 {
 808     return do_object_child_foreach(obj, fn, opaque, false);
 809 }
 810
 811 int object_child_foreach_recursive(Object *obj,
 812                                    int (*fn)(Object *child, void *opaque),
 813                                    void *opaque)
 814 {
 815     return do_object_child_foreach(obj, fn, opaque, true);
 816 }
 817
 818 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 819 {
 820     GSList **list = opaque;
 821
 822     *list = g_slist_prepend(*list, klass);
 823 }
 824
 825 GSList *object_class_get_list(const char *implements_type,
 826                               bool include_abstract)
 827 {
 828     GSList *list = NULL;
 829
 830     object_class_foreach(object_class_get_list_tramp,
 831                          implements_type, include_abstract, &list);
 832     return list;
 833 }
 834
 835 void object_ref(Object *obj)
 836 {
 837     if (!obj) {
 838         return;
 839     }
 840      atomic_inc(&obj->ref);
 841 }
 842
 843 void object_unref(Object *obj)
 844 {
 845     if (!obj) {
 846         return;
 847     }
 848     g_assert(obj->ref > 0);
 849
 850     /* parent always holds a reference to its children */
 851     if (atomic_fetch_dec(&obj->ref) == 1) {
 852         object_finalize(obj);
 853     }
 854 }
 855
 856 ObjectProperty *
 857 object_property_add(Object *obj, const char *name, const char *type,
 858                     ObjectPropertyAccessor *get,
 859                     ObjectPropertyAccessor *set,
 860                     ObjectPropertyRelease *release,
 861                     void *opaque, Error **errp)
 862 {
 863     ObjectProperty *prop;
 864     size_t name_len = strlen(name);
 865
 866     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
 867         int i;
 868         ObjectProperty *ret;
 869         char *name_no_array = g_strdup(name);
 870
 871         name_no_array[name_len - 3] = '\0';
 872         for (i = 0; ; ++i) {
 873             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
 874
 875             ret = object_property_add(obj, full_name, type, get, set,
 876                                       release, opaque, NULL);
 877             g_free(full_name);
 878             if (ret) {
 879                 break;
 880             }
 881         }
 882         g_free(name_no_array);
 883         return ret;
 884     }
 885
 886     QTAILQ_FOREACH(prop, &obj->properties, node) {
 887         if (strcmp(prop->name, name) == 0) {
 888             error_setg(errp, "attempt to add duplicate property '%s'"
 889                        " to object (type '%s')", name,
 890                        object_get_typename(obj));
 891             return NULL;
 892         }
 893     }
 894
 895     prop = g_malloc0(sizeof(*prop));
 896
 897     prop->name = g_strdup(name);
 898     prop->type = g_strdup(type);
 899
 900     prop->get = get;
 901     prop->set = set;
 902     prop->release = release;
 903     prop->opaque = opaque;
 904
 905     QTAILQ_INSERT_TAIL(&obj->properties, prop, node);
 906     return prop;
 907 }
 908
 909 ObjectProperty *object_property_find(Object *obj, const char *name,
 910                                      Error **errp)
 911 {
 912     ObjectProperty *prop;
 913
 914     QTAILQ_FOREACH(prop, &obj->properties, node) {
 915         if (strcmp(prop->name, name) == 0) {
 916             return prop;
 917         }
 918     }
 919
 920     error_setg(errp, "Property '.%s' not found", name);
 921     return NULL;
 922 }
 923
 924 ObjectPropertyIterator *object_property_iter_init(Object *obj)
 925 {
 926     ObjectPropertyIterator *ret = g_new0(ObjectPropertyIterator, 1);
 927     ret->next = QTAILQ_FIRST(&obj->properties);
 928     return ret;
 929 }
 930
 931 void object_property_iter_free(ObjectPropertyIterator *iter)
 932 {
 933     if (!iter) {
 934         return;
 935     }
 936     g_free(iter);
 937 }
 938
 939 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
 940 {
 941     ObjectProperty *ret = iter->next;
 942     if (ret) {
 943         iter->next = QTAILQ_NEXT(iter->next, node);
 944     }
 945     return ret;
 946 }
 947
 948 void object_property_del(Object *obj, const char *name, Error **errp)
 949 {
 950     ObjectProperty *prop = object_property_find(obj, name, errp);
 951     if (prop == NULL) {
 952         return;
 953     }
 954
 955     if (prop->release) {
 956         prop->release(obj, name, prop->opaque);
 957     }
 958
 959     QTAILQ_REMOVE(&obj->properties, prop, node);
 960
 961     g_free(prop->name);
 962     g_free(prop->type);
 963     g_free(prop->description);
 964     g_free(prop);
 965 }
 966
 967 void object_property_get(Object *obj, Visitor *v, const char *name,
 968                          Error **errp)
 969 {
 970     ObjectProperty *prop = object_property_find(obj, name, errp);
 971     if (prop == NULL) {
 972         return;
 973     }
 974
 975     if (!prop->get) {
 976         error_setg(errp, QERR_PERMISSION_DENIED);
 977     } else {
 978         prop->get(obj, v, prop->opaque, name, errp);
 979     }
 980 }
 981
 982 void object_property_set(Object *obj, Visitor *v, const char *name,
 983                          Error **errp)
 984 {
 985     ObjectProperty *prop = object_property_find(obj, name, errp);
 986     if (prop == NULL) {
 987         return;
 988     }
 989
 990     if (!prop->set) {
 991         error_setg(errp, QERR_PERMISSION_DENIED);
 992     } else {
 993         prop->set(obj, v, prop->opaque, name, errp);
 994     }
 995 }
 996
 997 void object_property_set_str(Object *obj, const char *value,
 998                              const char *name, Error **errp)
 999 {
1000     QString *qstr = qstring_from_str(value);
1001     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1002
1003     QDECREF(qstr);
1004 }
1005
1006 char *object_property_get_str(Object *obj, const char *name,
1007                               Error **errp)
1008 {
1009     QObject *ret = object_property_get_qobject(obj, name, errp);
1010     QString *qstring;
1011     char *retval;
1012
1013     if (!ret) {
1014         return NULL;
1015     }
1016     qstring = qobject_to_qstring(ret);
1017     if (!qstring) {
1018         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1019         retval = NULL;
1020     } else {
1021         retval = g_strdup(qstring_get_str(qstring));
1022     }
1023
1024     QDECREF(qstring);
1025     return retval;
1026 }
1027
1028 void object_property_set_link(Object *obj, Object *value,
1029                               const char *name, Error **errp)
1030 {
1031     if (value) {
1032         gchar *path = object_get_canonical_path(value);
1033         object_property_set_str(obj, path, name, errp);
1034         g_free(path);
1035     } else {
1036         object_property_set_str(obj, "", name, errp);
1037     }
1038 }
1039
1040 Object *object_property_get_link(Object *obj, const char *name,
1041                                  Error **errp)
1042 {
1043     char *str = object_property_get_str(obj, name, errp);
1044     Object *target = NULL;
1045
1046     if (str && *str) {
1047         target = object_resolve_path(str, NULL);
1048         if (!target) {
1049             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1050                       "Device '%s' not found", str);
1051         }
1052     }
1053
1054     g_free(str);
1055     return target;
1056 }
1057
1058 void object_property_set_bool(Object *obj, bool value,
1059                               const char *name, Error **errp)
1060 {
1061     QBool *qbool = qbool_from_bool(value);
1062     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1063
1064     QDECREF(qbool);
1065 }
1066
1067 bool object_property_get_bool(Object *obj, const char *name,
1068                               Error **errp)
1069 {
1070     QObject *ret = object_property_get_qobject(obj, name, errp);
1071     QBool *qbool;
1072     bool retval;
1073
1074     if (!ret) {
1075         return false;
1076     }
1077     qbool = qobject_to_qbool(ret);
1078     if (!qbool) {
1079         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1080         retval = false;
1081     } else {
1082         retval = qbool_get_bool(qbool);
1083     }
1084
1085     QDECREF(qbool);
1086     return retval;
1087 }
1088
1089 void object_property_set_int(Object *obj, int64_t value,
1090                              const char *name, Error **errp)
1091 {
1092     QInt *qint = qint_from_int(value);
1093     object_property_set_qobject(obj, QOBJECT(qint), name, errp);
1094
1095     QDECREF(qint);
1096 }
1097
1098 int64_t object_property_get_int(Object *obj, const char *name,
1099                                 Error **errp)
1100 {
1101     QObject *ret = object_property_get_qobject(obj, name, errp);
1102     QInt *qint;
1103     int64_t retval;
1104
1105     if (!ret) {
1106         return -1;
1107     }
1108     qint = qobject_to_qint(ret);
1109     if (!qint) {
1110         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1111         retval = -1;
1112     } else {
1113         retval = qint_get_int(qint);
1114     }
1115
1116     QDECREF(qint);
1117     return retval;
1118 }
1119
1120 typedef struct EnumProperty {
1121     const char * const *strings;
1122     int (*get)(Object *, Error **);
1123     void (*set)(Object *, int, Error **);
1124 } EnumProperty;
1125
1126 int object_property_get_enum(Object *obj, const char *name,
1127                              const char *typename, Error **errp)
1128 {
1129     Error *err = NULL;
1130     StringOutputVisitor *sov;
1131     StringInputVisitor *siv;
1132     char *str;
1133     int ret;
1134     ObjectProperty *prop = object_property_find(obj, name, errp);
1135     EnumProperty *enumprop;
1136
1137     if (prop == NULL) {
1138         return 0;
1139     }
1140
1141     if (!g_str_equal(prop->type, typename)) {
1142         error_setg(errp, "Property %s on %s is not '%s' enum type",
1143                    name, object_class_get_name(
1144                        object_get_class(obj)), typename);
1145         return 0;
1146     }
1147
1148     enumprop = prop->opaque;
1149
1150     sov = string_output_visitor_new(false);
1151     object_property_get(obj, string_output_get_visitor(sov), name, &err);
1152     if (err) {
1153         error_propagate(errp, err);
1154         string_output_visitor_cleanup(sov);
1155         return 0;
1156     }
1157     str = string_output_get_string(sov);
1158     siv = string_input_visitor_new(str);
1159     string_output_visitor_cleanup(sov);
1160     visit_type_enum(string_input_get_visitor(siv),
1161                     &ret, enumprop->strings, NULL, name, errp);
1162
1163     g_free(str);
1164     string_input_visitor_cleanup(siv);
1165
1166     return ret;
1167 }
1168
1169 void object_property_get_uint16List(Object *obj, const char *name,
1170                                     uint16List **list, Error **errp)
1171 {
1172     Error *err = NULL;
1173     StringOutputVisitor *ov;
1174     StringInputVisitor *iv;
1175     char *str;
1176
1177     ov = string_output_visitor_new(false);
1178     object_property_get(obj, string_output_get_visitor(ov),
1179                         name, &err);
1180     if (err) {
1181         error_propagate(errp, err);
1182         goto out;
1183     }
1184     str = string_output_get_string(ov);
1185     iv = string_input_visitor_new(str);
1186     visit_type_uint16List(string_input_get_visitor(iv),
1187                           list, NULL, errp);
1188
1189     g_free(str);
1190     string_input_visitor_cleanup(iv);
1191 out:
1192     string_output_visitor_cleanup(ov);
1193 }
1194
1195 void object_property_parse(Object *obj, const char *string,
1196                            const char *name, Error **errp)
1197 {
1198     StringInputVisitor *siv;
1199     siv = string_input_visitor_new(string);
1200     object_property_set(obj, string_input_get_visitor(siv), name, errp);
1201
1202     string_input_visitor_cleanup(siv);
1203 }
1204
1205 char *object_property_print(Object *obj, const char *name, bool human,
1206                             Error **errp)
1207 {
1208     StringOutputVisitor *sov;
1209     char *string = NULL;
1210     Error *local_err = NULL;
1211
1212     sov = string_output_visitor_new(human);
1213     object_property_get(obj, string_output_get_visitor(sov), name, &local_err);
1214     if (local_err) {
1215         error_propagate(errp, local_err);
1216         goto out;
1217     }
1218
1219     string = string_output_get_string(sov);
1220
1221 out:
1222     string_output_visitor_cleanup(sov);
1223     return string;
1224 }
1225
1226 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1227 {
1228     ObjectProperty *prop = object_property_find(obj, name, errp);
1229     if (prop == NULL) {
1230         return NULL;
1231     }
1232
1233     return prop->type;
1234 }
1235
1236 Object *object_get_root(void)
1237 {
1238     static Object *root;
1239
1240     if (!root) {
1241         root = object_new("container");
1242     }
1243
1244     return root;
1245 }
1246
1247 Object *object_get_objects_root(void)
1248 {
1249     return container_get(object_get_root(), "/objects");
1250 }
1251
1252 static void object_get_child_property(Object *obj, Visitor *v, void *opaque,
1253                                       const char *name, Error **errp)
1254 {
1255     Object *child = opaque;
1256     gchar *path;
1257
1258     path = object_get_canonical_path(child);
1259     visit_type_str(v, &path, name, errp);
1260     g_free(path);
1261 }
1262
1263 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1264 {
1265     return opaque;
1266 }
1267
1268 static void object_finalize_child_property(Object *obj, const char *name,
1269                                            void *opaque)
1270 {
1271     Object *child = opaque;
1272
1273     if (child->class->unparent) {
1274         (child->class->unparent)(child);
1275     }
1276     child->parent = NULL;
1277     object_unref(child);
1278 }
1279
1280 void object_property_add_child(Object *obj, const char *name,
1281                                Object *child, Error **errp)
1282 {
1283     Error *local_err = NULL;
1284     gchar *type;
1285     ObjectProperty *op;
1286
1287     if (child->parent != NULL) {
1288         error_setg(errp, "child object is already parented");
1289         return;
1290     }
1291
1292     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1293
1294     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1295                              object_finalize_child_property, child, &local_err);
1296     if (local_err) {
1297         error_propagate(errp, local_err);
1298         goto out;
1299     }
1300
1301     op->resolve = object_resolve_child_property;
1302     object_ref(child);
1303     child->parent = obj;
1304
1305 out:
1306     g_free(type);
1307 }
1308
1309 void object_property_allow_set_link(Object *obj, const char *name,
1310                                     Object *val, Error **errp)
1311 {
1312     /* Allow the link to be set, always */
1313 }
1314
1315 typedef struct {
1316     Object **child;
1317     void (*check)(Object *, const char *, Object *, Error **);
1318     ObjectPropertyLinkFlags flags;
1319 } LinkProperty;
1320
1321 static void object_get_link_property(Object *obj, Visitor *v, void *opaque,
1322                                      const char *name, Error **errp)
1323 {
1324     LinkProperty *lprop = opaque;
1325     Object **child = lprop->child;
1326     gchar *path;
1327
1328     if (*child) {
1329         path = object_get_canonical_path(*child);
1330         visit_type_str(v, &path, name, errp);
1331         g_free(path);
1332     } else {
1333         path = (gchar *)"";
1334         visit_type_str(v, &path, name, errp);
1335     }
1336 }
1337
1338 /*
1339  * object_resolve_link:
1340  *
1341  * Lookup an object and ensure its type matches the link property type.  This
1342  * is similar to object_resolve_path() except type verification against the
1343  * link property is performed.
1344  *
1345  * Returns: The matched object or NULL on path lookup failures.
1346  */
1347 static Object *object_resolve_link(Object *obj, const char *name,
1348                                    const char *path, Error **errp)
1349 {
1350     const char *type;
1351     gchar *target_type;
1352     bool ambiguous = false;
1353     Object *target;
1354
1355     /* Go from link<FOO> to FOO.  */
1356     type = object_property_get_type(obj, name, NULL);
1357     target_type = g_strndup(&type[5], strlen(type) - 6);
1358     target = object_resolve_path_type(path, target_type, &ambiguous);
1359
1360     if (ambiguous) {
1361         error_setg(errp, "Path '%s' does not uniquely identify an object",
1362                    path);
1363     } else if (!target) {
1364         target = object_resolve_path(path, &ambiguous);
1365         if (target || ambiguous) {
1366             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1367         } else {
1368             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1369                       "Device '%s' not found", path);
1370         }
1371         target = NULL;
1372     }
1373     g_free(target_type);
1374
1375     return target;
1376 }
1377
1378 static void object_set_link_property(Object *obj, Visitor *v, void *opaque,
1379                                      const char *name, Error **errp)
1380 {
1381     Error *local_err = NULL;
1382     LinkProperty *prop = opaque;
1383     Object **child = prop->child;
1384     Object *old_target = *child;
1385     Object *new_target = NULL;
1386     char *path = NULL;
1387
1388     visit_type_str(v, &path, name, &local_err);
1389
1390     if (!local_err && strcmp(path, "") != 0) {
1391         new_target = object_resolve_link(obj, name, path, &local_err);
1392     }
1393
1394     g_free(path);
1395     if (local_err) {
1396         error_propagate(errp, local_err);
1397         return;
1398     }
1399
1400     prop->check(obj, name, new_target, &local_err);
1401     if (local_err) {
1402         error_propagate(errp, local_err);
1403         return;
1404     }
1405
1406     object_ref(new_target);
1407     *child = new_target;
1408     object_unref(old_target);
1409 }
1410
1411 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1412 {
1413     LinkProperty *lprop = opaque;
1414
1415     return *lprop->child;
1416 }
1417
1418 static void object_release_link_property(Object *obj, const char *name,
1419                                          void *opaque)
1420 {
1421     LinkProperty *prop = opaque;
1422
1423     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1424         object_unref(*prop->child);
1425     }
1426     g_free(prop);
1427 }
1428
1429 void object_property_add_link(Object *obj, const char *name,
1430                               const char *type, Object **child,
1431                               void (*check)(Object *, const char *,
1432                                             Object *, Error **),
1433                               ObjectPropertyLinkFlags flags,
1434                               Error **errp)
1435 {
1436     Error *local_err = NULL;
1437     LinkProperty *prop = g_malloc(sizeof(*prop));
1438     gchar *full_type;
1439     ObjectProperty *op;
1440
1441     prop->child = child;
1442     prop->check = check;
1443     prop->flags = flags;
1444
1445     full_type = g_strdup_printf("link<%s>", type);
1446
1447     op = object_property_add(obj, name, full_type,
1448                              object_get_link_property,
1449                              check ? object_set_link_property : NULL,
1450                              object_release_link_property,
1451                              prop,
1452                              &local_err);
1453     if (local_err) {
1454         error_propagate(errp, local_err);
1455         g_free(prop);
1456         goto out;
1457     }
1458
1459     op->resolve = object_resolve_link_property;
1460
1461 out:
1462     g_free(full_type);
1463 }
1464
1465 void object_property_add_const_link(Object *obj, const char *name,
1466                                     Object *target, Error **errp)
1467 {
1468     char *link_type;
1469     ObjectProperty *op;
1470
1471     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1472     op = object_property_add(obj, name, link_type,
1473                              object_get_child_property, NULL,
1474                              NULL, target, errp);
1475     if (op != NULL) {
1476         op->resolve = object_resolve_child_property;
1477     }
1478     g_free(link_type);
1479 }
1480
1481 gchar *object_get_canonical_path_component(Object *obj)
1482 {
1483     ObjectProperty *prop = NULL;
1484
1485     g_assert(obj);
1486     g_assert(obj->parent != NULL);
1487
1488     QTAILQ_FOREACH(prop, &obj->parent->properties, node) {
1489         if (!object_property_is_child(prop)) {
1490             continue;
1491         }
1492
1493         if (prop->opaque == obj) {
1494             return g_strdup(prop->name);
1495         }
1496     }
1497
1498     /* obj had a parent but was not a child, should never happen */
1499     g_assert_not_reached();
1500     return NULL;
1501 }
1502
1503 gchar *object_get_canonical_path(Object *obj)
1504 {
1505     Object *root = object_get_root();
1506     char *newpath, *path = NULL;
1507
1508     while (obj != root) {
1509         char *component = object_get_canonical_path_component(obj);
1510
1511         if (path) {
1512             newpath = g_strdup_printf("%s/%s", component, path);
1513             g_free(component);
1514             g_free(path);
1515             path = newpath;
1516         } else {
1517             path = component;
1518         }
1519
1520         obj = obj->parent;
1521     }
1522
1523     newpath = g_strdup_printf("/%s", path ? path : "");
1524     g_free(path);
1525
1526     return newpath;
1527 }
1528
1529 Object *object_resolve_path_component(Object *parent, const gchar *part)
1530 {
1531     ObjectProperty *prop = object_property_find(parent, part, NULL);
1532     if (prop == NULL) {
1533         return NULL;
1534     }
1535
1536     if (prop->resolve) {
1537         return prop->resolve(parent, prop->opaque, part);
1538     } else {
1539         return NULL;
1540     }
1541 }
1542
1543 static Object *object_resolve_abs_path(Object *parent,
1544                                           gchar **parts,
1545                                           const char *typename,
1546                                           int index)
1547 {
1548     Object *child;
1549
1550     if (parts[index] == NULL) {
1551         return object_dynamic_cast(parent, typename);
1552     }
1553
1554     if (strcmp(parts[index], "") == 0) {
1555         return object_resolve_abs_path(parent, parts, typename, index + 1);
1556     }
1557
1558     child = object_resolve_path_component(parent, parts[index]);
1559     if (!child) {
1560         return NULL;
1561     }
1562
1563     return object_resolve_abs_path(child, parts, typename, index + 1);
1564 }
1565
1566 static Object *object_resolve_partial_path(Object *parent,
1567                                               gchar **parts,
1568                                               const char *typename,
1569                                               bool *ambiguous)
1570 {
1571     Object *obj;
1572     ObjectProperty *prop;
1573
1574     obj = object_resolve_abs_path(parent, parts, typename, 0);
1575
1576     QTAILQ_FOREACH(prop, &parent->properties, node) {
1577         Object *found;
1578
1579         if (!object_property_is_child(prop)) {
1580             continue;
1581         }
1582
1583         found = object_resolve_partial_path(prop->opaque, parts,
1584                                             typename, ambiguous);
1585         if (found) {
1586             if (obj) {
1587                 if (ambiguous) {
1588                     *ambiguous = true;
1589                 }
1590                 return NULL;
1591             }
1592             obj = found;
1593         }
1594
1595         if (ambiguous && *ambiguous) {
1596             return NULL;
1597         }
1598     }
1599
1600     return obj;
1601 }
1602
1603 Object *object_resolve_path_type(const char *path, const char *typename,
1604                                  bool *ambiguous)
1605 {
1606     Object *obj;
1607     gchar **parts;
1608
1609     parts = g_strsplit(path, "/", 0);
1610     assert(parts);
1611
1612     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1613         if (ambiguous) {
1614             *ambiguous = false;
1615         }
1616         obj = object_resolve_partial_path(object_get_root(), parts,
1617                                           typename, ambiguous);
1618     } else {
1619         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1620     }
1621
1622     g_strfreev(parts);
1623
1624     return obj;
1625 }
1626
1627 Object *object_resolve_path(const char *path, bool *ambiguous)
1628 {
1629     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1630 }
1631
1632 typedef struct StringProperty
1633 {
1634     char *(*get)(Object *, Error **);
1635     void (*set)(Object *, const char *, Error **);
1636 } StringProperty;
1637
1638 static void property_get_str(Object *obj, Visitor *v, void *opaque,
1639                              const char *name, Error **errp)
1640 {
1641     StringProperty *prop = opaque;
1642     char *value;
1643     Error *err = NULL;
1644
1645     value = prop->get(obj, &err);
1646     if (err) {
1647         error_propagate(errp, err);
1648         return;
1649     }
1650
1651     visit_type_str(v, &value, name, errp);
1652     g_free(value);
1653 }
1654
1655 static void property_set_str(Object *obj, Visitor *v, void *opaque,
1656                              const char *name, Error **errp)
1657 {
1658     StringProperty *prop = opaque;
1659     char *value;
1660     Error *local_err = NULL;
1661
1662     visit_type_str(v, &value, name, &local_err);
1663     if (local_err) {
1664         error_propagate(errp, local_err);
1665         return;
1666     }
1667
1668     prop->set(obj, value, errp);
1669     g_free(value);
1670 }
1671
1672 static void property_release_str(Object *obj, const char *name,
1673                                  void *opaque)
1674 {
1675     StringProperty *prop = opaque;
1676     g_free(prop);
1677 }
1678
1679 void object_property_add_str(Object *obj, const char *name,
1680                            char *(*get)(Object *, Error **),
1681                            void (*set)(Object *, const char *, Error **),
1682                            Error **errp)
1683 {
1684     Error *local_err = NULL;
1685     StringProperty *prop = g_malloc0(sizeof(*prop));
1686
1687     prop->get = get;
1688     prop->set = set;
1689
1690     object_property_add(obj, name, "string",
1691                         get ? property_get_str : NULL,
1692                         set ? property_set_str : NULL,
1693                         property_release_str,
1694                         prop, &local_err);
1695     if (local_err) {
1696         error_propagate(errp, local_err);
1697         g_free(prop);
1698     }
1699 }
1700
1701 typedef struct BoolProperty
1702 {
1703     bool (*get)(Object *, Error **);
1704     void (*set)(Object *, bool, Error **);
1705 } BoolProperty;
1706
1707 static void property_get_bool(Object *obj, Visitor *v, void *opaque,
1708                               const char *name, Error **errp)
1709 {
1710     BoolProperty *prop = opaque;
1711     bool value;
1712     Error *err = NULL;
1713
1714     value = prop->get(obj, &err);
1715     if (err) {
1716         error_propagate(errp, err);
1717         return;
1718     }
1719
1720     visit_type_bool(v, &value, name, errp);
1721 }
1722
1723 static void property_set_bool(Object *obj, Visitor *v, void *opaque,
1724                               const char *name, Error **errp)
1725 {
1726     BoolProperty *prop = opaque;
1727     bool value;
1728     Error *local_err = NULL;
1729
1730     visit_type_bool(v, &value, name, &local_err);
1731     if (local_err) {
1732         error_propagate(errp, local_err);
1733         return;
1734     }
1735
1736     prop->set(obj, value, errp);
1737 }
1738
1739 static void property_release_bool(Object *obj, const char *name,
1740                                   void *opaque)
1741 {
1742     BoolProperty *prop = opaque;
1743     g_free(prop);
1744 }
1745
1746 void object_property_add_bool(Object *obj, const char *name,
1747                               bool (*get)(Object *, Error **),
1748                               void (*set)(Object *, bool, Error **),
1749                               Error **errp)
1750 {
1751     Error *local_err = NULL;
1752     BoolProperty *prop = g_malloc0(sizeof(*prop));
1753
1754     prop->get = get;
1755     prop->set = set;
1756
1757     object_property_add(obj, name, "bool",
1758                         get ? property_get_bool : NULL,
1759                         set ? property_set_bool : NULL,
1760                         property_release_bool,
1761                         prop, &local_err);
1762     if (local_err) {
1763         error_propagate(errp, local_err);
1764         g_free(prop);
1765     }
1766 }
1767
1768 static void property_get_enum(Object *obj, Visitor *v, void *opaque,
1769                               const char *name, Error **errp)
1770 {
1771     EnumProperty *prop = opaque;
1772     int value;
1773     Error *err = NULL;
1774
1775     value = prop->get(obj, &err);
1776     if (err) {
1777         error_propagate(errp, err);
1778         return;
1779     }
1780
1781     visit_type_enum(v, &value, prop->strings, NULL, name, errp);
1782 }
1783
1784 static void property_set_enum(Object *obj, Visitor *v, void *opaque,
1785                               const char *name, Error **errp)
1786 {
1787     EnumProperty *prop = opaque;
1788     int value;
1789     Error *err = NULL;
1790
1791     visit_type_enum(v, &value, prop->strings, NULL, name, &err);
1792     if (err) {
1793         error_propagate(errp, err);
1794         return;
1795     }
1796     prop->set(obj, value, errp);
1797 }
1798
1799 static void property_release_enum(Object *obj, const char *name,
1800                                   void *opaque)
1801 {
1802     EnumProperty *prop = opaque;
1803     g_free(prop);
1804 }
1805
1806 void object_property_add_enum(Object *obj, const char *name,
1807                               const char *typename,
1808                               const char * const *strings,
1809                               int (*get)(Object *, Error **),
1810                               void (*set)(Object *, int, Error **),
1811                               Error **errp)
1812 {
1813     Error *local_err = NULL;
1814     EnumProperty *prop = g_malloc(sizeof(*prop));
1815
1816     prop->strings = strings;
1817     prop->get = get;
1818     prop->set = set;
1819
1820     object_property_add(obj, name, typename,
1821                         get ? property_get_enum : NULL,
1822                         set ? property_set_enum : NULL,
1823                         property_release_enum,
1824                         prop, &local_err);
1825     if (local_err) {
1826         error_propagate(errp, local_err);
1827         g_free(prop);
1828     }
1829 }
1830
1831 typedef struct TMProperty {
1832     void (*get)(Object *, struct tm *, Error **);
1833 } TMProperty;
1834
1835 static void property_get_tm(Object *obj, Visitor *v, void *opaque,
1836                             const char *name, Error **errp)
1837 {
1838     TMProperty *prop = opaque;
1839     Error *err = NULL;
1840     struct tm value;
1841
1842     prop->get(obj, &value, &err);
1843     if (err) {
1844         goto out;
1845     }
1846
1847     visit_start_struct(v, NULL, "struct tm", name, 0, &err);
1848     if (err) {
1849         goto out;
1850     }
1851     visit_type_int32(v, &value.tm_year, "tm_year", &err);
1852     if (err) {
1853         goto out_end;
1854     }
1855     visit_type_int32(v, &value.tm_mon, "tm_mon", &err);
1856     if (err) {
1857         goto out_end;
1858     }
1859     visit_type_int32(v, &value.tm_mday, "tm_mday", &err);
1860     if (err) {
1861         goto out_end;
1862     }
1863     visit_type_int32(v, &value.tm_hour, "tm_hour", &err);
1864     if (err) {
1865         goto out_end;
1866     }
1867     visit_type_int32(v, &value.tm_min, "tm_min", &err);
1868     if (err) {
1869         goto out_end;
1870     }
1871     visit_type_int32(v, &value.tm_sec, "tm_sec", &err);
1872     if (err) {
1873         goto out_end;
1874     }
1875 out_end:
1876     error_propagate(errp, err);
1877     err = NULL;
1878     visit_end_struct(v, errp);
1879 out:
1880     error_propagate(errp, err);
1881
1882 }
1883
1884 static void property_release_tm(Object *obj, const char *name,
1885                                 void *opaque)
1886 {
1887     TMProperty *prop = opaque;
1888     g_free(prop);
1889 }
1890
1891 void object_property_add_tm(Object *obj, const char *name,
1892                             void (*get)(Object *, struct tm *, Error **),
1893                             Error **errp)
1894 {
1895     Error *local_err = NULL;
1896     TMProperty *prop = g_malloc0(sizeof(*prop));
1897
1898     prop->get = get;
1899
1900     object_property_add(obj, name, "struct tm",
1901                         get ? property_get_tm : NULL, NULL,
1902                         property_release_tm,
1903                         prop, &local_err);
1904     if (local_err) {
1905         error_propagate(errp, local_err);
1906         g_free(prop);
1907     }
1908 }
1909
1910 static char *qdev_get_type(Object *obj, Error **errp)
1911 {
1912     return g_strdup(object_get_typename(obj));
1913 }
1914
1915 static void property_get_uint8_ptr(Object *obj, Visitor *v,
1916                                    void *opaque, const char *name,
1917                                    Error **errp)
1918 {
1919     uint8_t value = *(uint8_t *)opaque;
1920     visit_type_uint8(v, &value, name, errp);
1921 }
1922
1923 static void property_get_uint16_ptr(Object *obj, Visitor *v,
1924                                    void *opaque, const char *name,
1925                                    Error **errp)
1926 {
1927     uint16_t value = *(uint16_t *)opaque;
1928     visit_type_uint16(v, &value, name, errp);
1929 }
1930
1931 static void property_get_uint32_ptr(Object *obj, Visitor *v,
1932                                    void *opaque, const char *name,
1933                                    Error **errp)
1934 {
1935     uint32_t value = *(uint32_t *)opaque;
1936     visit_type_uint32(v, &value, name, errp);
1937 }
1938
1939 static void property_get_uint64_ptr(Object *obj, Visitor *v,
1940                                    void *opaque, const char *name,
1941                                    Error **errp)
1942 {
1943     uint64_t value = *(uint64_t *)opaque;
1944     visit_type_uint64(v, &value, name, errp);
1945 }
1946
1947 void object_property_add_uint8_ptr(Object *obj, const char *name,
1948                                    const uint8_t *v, Error **errp)
1949 {
1950     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
1951                         NULL, NULL, (void *)v, errp);
1952 }
1953
1954 void object_property_add_uint16_ptr(Object *obj, const char *name,
1955                                     const uint16_t *v, Error **errp)
1956 {
1957     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
1958                         NULL, NULL, (void *)v, errp);
1959 }
1960
1961 void object_property_add_uint32_ptr(Object *obj, const char *name,
1962                                     const uint32_t *v, Error **errp)
1963 {
1964     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
1965                         NULL, NULL, (void *)v, errp);
1966 }
1967
1968 void object_property_add_uint64_ptr(Object *obj, const char *name,
1969                                     const uint64_t *v, Error **errp)
1970 {
1971     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
1972                         NULL, NULL, (void *)v, errp);
1973 }
1974
1975 typedef struct {
1976     Object *target_obj;
1977     char *target_name;
1978 } AliasProperty;
1979
1980 static void property_get_alias(Object *obj, struct Visitor *v, void *opaque,
1981                                const char *name, Error **errp)
1982 {
1983     AliasProperty *prop = opaque;
1984
1985     object_property_get(prop->target_obj, v, prop->target_name, errp);
1986 }
1987
1988 static void property_set_alias(Object *obj, struct Visitor *v, void *opaque,
1989                                const char *name, Error **errp)
1990 {
1991     AliasProperty *prop = opaque;
1992
1993     object_property_set(prop->target_obj, v, prop->target_name, errp);
1994 }
1995
1996 static Object *property_resolve_alias(Object *obj, void *opaque,
1997                                       const gchar *part)
1998 {
1999     AliasProperty *prop = opaque;
2000
2001     return object_resolve_path_component(prop->target_obj, prop->target_name);
2002 }
2003
2004 static void property_release_alias(Object *obj, const char *name, void *opaque)
2005 {
2006     AliasProperty *prop = opaque;
2007
2008     g_free(prop->target_name);
2009     g_free(prop);
2010 }
2011
2012 void object_property_add_alias(Object *obj, const char *name,
2013                                Object *target_obj, const char *target_name,
2014                                Error **errp)
2015 {
2016     AliasProperty *prop;
2017     ObjectProperty *op;
2018     ObjectProperty *target_prop;
2019     gchar *prop_type;
2020     Error *local_err = NULL;
2021
2022     target_prop = object_property_find(target_obj, target_name, errp);
2023     if (!target_prop) {
2024         return;
2025     }
2026
2027     if (object_property_is_child(target_prop)) {
2028         prop_type = g_strdup_printf("link%s",
2029                                     target_prop->type + strlen("child"));
2030     } else {
2031         prop_type = g_strdup(target_prop->type);
2032     }
2033
2034     prop = g_malloc(sizeof(*prop));
2035     prop->target_obj = target_obj;
2036     prop->target_name = g_strdup(target_name);
2037
2038     op = object_property_add(obj, name, prop_type,
2039                              property_get_alias,
2040                              property_set_alias,
2041                              property_release_alias,
2042                              prop, &local_err);
2043     if (local_err) {
2044         error_propagate(errp, local_err);
2045         g_free(prop);
2046         goto out;
2047     }
2048     op->resolve = property_resolve_alias;
2049
2050     object_property_set_description(obj, op->name,
2051                                     target_prop->description,
2052                                     &error_abort);
2053
2054 out:
2055     g_free(prop_type);
2056 }
2057
2058 void object_property_set_description(Object *obj, const char *name,
2059                                      const char *description, Error **errp)
2060 {
2061     ObjectProperty *op;
2062
2063     op = object_property_find(obj, name, errp);
2064     if (!op) {
2065         return;
2066     }
2067
2068     g_free(op->description);
2069     op->description = g_strdup(description);
2070 }
2071
2072 static void object_instance_init(Object *obj)
2073 {
2074     object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
2075 }
2076
2077 static void register_types(void)
2078 {
2079     static TypeInfo interface_info = {
2080         .name = TYPE_INTERFACE,
2081         .class_size = sizeof(InterfaceClass),
2082         .abstract = true,
2083     };
2084
2085     static TypeInfo object_info = {
2086         .name = TYPE_OBJECT,
2087         .instance_size = sizeof(Object),
2088         .instance_init = object_instance_init,
2089         .abstract = true,
2090     };
2091
2092     type_interface = type_register_internal(&interface_info);
2093     type_register_internal(&object_info);
2094 }
2095
2096 type_init(register_types)