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 "hw/qdev-core.h"
  15 #include "qapi/error.h"
  16 #include "qom/object.h"
  17 #include "qom/object_interfaces.h"
  18 #include "qemu/cutils.h"
  19 #include "qapi/visitor.h"
  20 #include "qapi/string-input-visitor.h"
  21 #include "qapi/string-output-visitor.h"
  22 #include "qapi/qobject-input-visitor.h"
  23 #include "qapi/qapi-builtin-visit.h"
  24 #include "qapi/qmp/qerror.h"
  25 #include "qapi/qmp/qjson.h"
  26 #include "trace.h"
  27
  28 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  29  * of the QOM core on QObject?  */
  30 #include "qom/qom-qobject.h"
  31 #include "qapi/qmp/qbool.h"
  32 #include "qapi/qmp/qnum.h"
  33 #include "qapi/qmp/qstring.h"
  34 #include "qemu/error-report.h"
  35
  36 #define MAX_INTERFACES 32
  37
  38 typedef struct InterfaceImpl InterfaceImpl;
  39 typedef struct TypeImpl TypeImpl;
  40
  41 struct InterfaceImpl
  42 {
  43     const char *typename;
  44 };
  45
  46 struct TypeImpl
  47 {
  48     const char *name;
  49
  50     size_t class_size;
  51
  52     size_t instance_size;
  53
  54     void (*class_init)(ObjectClass *klass, void *data);
  55     void (*class_base_init)(ObjectClass *klass, void *data);
  56
  57     void *class_data;
  58
  59     void (*instance_init)(Object *obj);
  60     void (*instance_post_init)(Object *obj);
  61     void (*instance_finalize)(Object *obj);
  62
  63     bool abstract;
  64
  65     const char *parent;
  66     TypeImpl *parent_type;
  67
  68     ObjectClass *class;
  69
  70     int num_interfaces;
  71     InterfaceImpl interfaces[MAX_INTERFACES];
  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_data = info->class_data;
 121
 122     ti->instance_init = info->instance_init;
 123     ti->instance_post_init = info->instance_post_init;
 124     ti->instance_finalize = info->instance_finalize;
 125
 126     ti->abstract = info->abstract;
 127
 128     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 129         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 130     }
 131     ti->num_interfaces = i;
 132
 133     return ti;
 134 }
 135
 136 static TypeImpl *type_register_internal(const TypeInfo *info)
 137 {
 138     TypeImpl *ti;
 139     ti = type_new(info);
 140
 141     type_table_add(ti);
 142     return ti;
 143 }
 144
 145 TypeImpl *type_register(const TypeInfo *info)
 146 {
 147     assert(info->parent);
 148     return type_register_internal(info);
 149 }
 150
 151 TypeImpl *type_register_static(const TypeInfo *info)
 152 {
 153     return type_register(info);
 154 }
 155
 156 void type_register_static_array(const TypeInfo *infos, int nr_infos)
 157 {
 158     int i;
 159
 160     for (i = 0; i < nr_infos; i++) {
 161         type_register_static(&infos[i]);
 162     }
 163 }
 164
 165 static TypeImpl *type_get_by_name(const char *name)
 166 {
 167     if (name == NULL) {
 168         return NULL;
 169     }
 170
 171     return type_table_lookup(name);
 172 }
 173
 174 static TypeImpl *type_get_parent(TypeImpl *type)
 175 {
 176     if (!type->parent_type && type->parent) {
 177         type->parent_type = type_get_by_name(type->parent);
 178         if (!type->parent_type) {
 179             fprintf(stderr, "Type '%s' is missing its parent '%s'\n",
 180                     type->name, type->parent);
 181             abort();
 182         }
 183     }
 184
 185     return type->parent_type;
 186 }
 187
 188 static bool type_has_parent(TypeImpl *type)
 189 {
 190     return (type->parent != NULL);
 191 }
 192
 193 static size_t type_class_get_size(TypeImpl *ti)
 194 {
 195     if (ti->class_size) {
 196         return ti->class_size;
 197     }
 198
 199     if (type_has_parent(ti)) {
 200         return type_class_get_size(type_get_parent(ti));
 201     }
 202
 203     return sizeof(ObjectClass);
 204 }
 205
 206 static size_t type_object_get_size(TypeImpl *ti)
 207 {
 208     if (ti->instance_size) {
 209         return ti->instance_size;
 210     }
 211
 212     if (type_has_parent(ti)) {
 213         return type_object_get_size(type_get_parent(ti));
 214     }
 215
 216     return 0;
 217 }
 218
 219 size_t object_type_get_instance_size(const char *typename)
 220 {
 221     TypeImpl *type = type_get_by_name(typename);
 222
 223     g_assert(type != NULL);
 224     return type_object_get_size(type);
 225 }
 226
 227 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 228 {
 229     assert(target_type);
 230
 231     /* Check if target_type is a direct ancestor of type */
 232     while (type) {
 233         if (type == target_type) {
 234             return true;
 235         }
 236
 237         type = type_get_parent(type);
 238     }
 239
 240     return false;
 241 }
 242
 243 static void type_initialize(TypeImpl *ti);
 244
 245 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 246                                       TypeImpl *parent_type)
 247 {
 248     InterfaceClass *new_iface;
 249     TypeInfo info = { };
 250     TypeImpl *iface_impl;
 251
 252     info.parent = parent_type->name;
 253     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 254     info.abstract = true;
 255
 256     iface_impl = type_new(&info);
 257     iface_impl->parent_type = parent_type;
 258     type_initialize(iface_impl);
 259     g_free((char *)info.name);
 260
 261     new_iface = (InterfaceClass *)iface_impl->class;
 262     new_iface->concrete_class = ti->class;
 263     new_iface->interface_type = interface_type;
 264
 265     ti->class->interfaces = g_slist_append(ti->class->interfaces, new_iface);
 266 }
 267
 268 static void object_property_free(gpointer data)
 269 {
 270     ObjectProperty *prop = data;
 271
 272     if (prop->defval) {
 273         qobject_unref(prop->defval);
 274         prop->defval = NULL;
 275     }
 276     g_free(prop->name);
 277     g_free(prop->type);
 278     g_free(prop->description);
 279     g_free(prop);
 280 }
 281
 282 static void type_initialize(TypeImpl *ti)
 283 {
 284     TypeImpl *parent;
 285
 286     if (ti->class) {
 287         return;
 288     }
 289
 290     ti->class_size = type_class_get_size(ti);
 291     ti->instance_size = type_object_get_size(ti);
 292     /* Any type with zero instance_size is implicitly abstract.
 293      * This means interface types are all abstract.
 294      */
 295     if (ti->instance_size == 0) {
 296         ti->abstract = true;
 297     }
 298     if (type_is_ancestor(ti, type_interface)) {
 299         assert(ti->instance_size == 0);
 300         assert(ti->abstract);
 301         assert(!ti->instance_init);
 302         assert(!ti->instance_post_init);
 303         assert(!ti->instance_finalize);
 304         assert(!ti->num_interfaces);
 305     }
 306     ti->class = g_malloc0(ti->class_size);
 307
 308     parent = type_get_parent(ti);
 309     if (parent) {
 310         type_initialize(parent);
 311         GSList *e;
 312         int i;
 313
 314         g_assert(parent->class_size <= ti->class_size);
 315         g_assert(parent->instance_size <= ti->instance_size);
 316         memcpy(ti->class, parent->class, parent->class_size);
 317         ti->class->interfaces = NULL;
 318
 319         for (e = parent->class->interfaces; e; e = e->next) {
 320             InterfaceClass *iface = e->data;
 321             ObjectClass *klass = OBJECT_CLASS(iface);
 322
 323             type_initialize_interface(ti, iface->interface_type, klass->type);
 324         }
 325
 326         for (i = 0; i < ti->num_interfaces; i++) {
 327             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 328             if (!t) {
 329                 error_report("missing interface '%s' for object '%s'",
 330                              ti->interfaces[i].typename, parent->name);
 331                 abort();
 332             }
 333             for (e = ti->class->interfaces; e; e = e->next) {
 334                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 335
 336                 if (type_is_ancestor(target_type, t)) {
 337                     break;
 338                 }
 339             }
 340
 341             if (e) {
 342                 continue;
 343             }
 344
 345             type_initialize_interface(ti, t, t);
 346         }
 347     }
 348
 349     ti->class->properties = g_hash_table_new_full(g_str_hash, g_str_equal, NULL,
 350                                                   object_property_free);
 351
 352     ti->class->type = ti;
 353
 354     while (parent) {
 355         if (parent->class_base_init) {
 356             parent->class_base_init(ti->class, ti->class_data);
 357         }
 358         parent = type_get_parent(parent);
 359     }
 360
 361     if (ti->class_init) {
 362         ti->class_init(ti->class, ti->class_data);
 363     }
 364 }
 365
 366 static void object_init_with_type(Object *obj, TypeImpl *ti)
 367 {
 368     if (type_has_parent(ti)) {
 369         object_init_with_type(obj, type_get_parent(ti));
 370     }
 371
 372     if (ti->instance_init) {
 373         ti->instance_init(obj);
 374     }
 375 }
 376
 377 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 378 {
 379     if (ti->instance_post_init) {
 380         ti->instance_post_init(obj);
 381     }
 382
 383     if (type_has_parent(ti)) {
 384         object_post_init_with_type(obj, type_get_parent(ti));
 385     }
 386 }
 387
 388 bool object_apply_global_props(Object *obj, const GPtrArray *props,
 389                                Error **errp)
 390 {
 391     int i;
 392
 393     if (!props) {
 394         return true;
 395     }
 396
 397     for (i = 0; i < props->len; i++) {
 398         GlobalProperty *p = g_ptr_array_index(props, i);
 399         Error *err = NULL;
 400
 401         if (object_dynamic_cast(obj, p->driver) == NULL) {
 402             continue;
 403         }
 404         if (p->optional && !object_property_find(obj, p->property, NULL)) {
 405             continue;
 406         }
 407         p->used = true;
 408         if (!object_property_parse(obj, p->property, p->value, &err)) {
 409             error_prepend(&err, "can't apply global %s.%s=%s: ",
 410                           p->driver, p->property, p->value);
 411             /*
 412              * If errp != NULL, propagate error and return.
 413              * If errp == NULL, report a warning, but keep going
 414              * with the remaining globals.
 415              */
 416             if (errp) {
 417                 error_propagate(errp, err);
 418                 return false;
 419             } else {
 420                 warn_report_err(err);
 421             }
 422         }
 423     }
 424
 425     return true;
 426 }
 427
 428 /*
 429  * Global property defaults
 430  * Slot 0: accelerator's global property defaults
 431  * Slot 1: machine's global property defaults
 432  * Slot 2: global properties from legacy command line option
 433  * Each is a GPtrArray of of GlobalProperty.
 434  * Applied in order, later entries override earlier ones.
 435  */
 436 static GPtrArray *object_compat_props[3];
 437
 438 /*
 439  * Retrieve @GPtrArray for global property defined with options
 440  * other than "-global".  These are generally used for syntactic
 441  * sugar and legacy command line options.
 442  */
 443 void object_register_sugar_prop(const char *driver, const char *prop, const char *value)
 444 {
 445     GlobalProperty *g;
 446     if (!object_compat_props[2]) {
 447         object_compat_props[2] = g_ptr_array_new();
 448     }
 449     g = g_new0(GlobalProperty, 1);
 450     g->driver = g_strdup(driver);
 451     g->property = g_strdup(prop);
 452     g->value = g_strdup(value);
 453     g_ptr_array_add(object_compat_props[2], g);
 454 }
 455
 456 /*
 457  * Set machine's global property defaults to @compat_props.
 458  * May be called at most once.
 459  */
 460 void object_set_machine_compat_props(GPtrArray *compat_props)
 461 {
 462     assert(!object_compat_props[1]);
 463     object_compat_props[1] = compat_props;
 464 }
 465
 466 /*
 467  * Set accelerator's global property defaults to @compat_props.
 468  * May be called at most once.
 469  */
 470 void object_set_accelerator_compat_props(GPtrArray *compat_props)
 471 {
 472     assert(!object_compat_props[0]);
 473     object_compat_props[0] = compat_props;
 474 }
 475
 476 void object_apply_compat_props(Object *obj)
 477 {
 478     int i;
 479
 480     for (i = 0; i < ARRAY_SIZE(object_compat_props); i++) {
 481         object_apply_global_props(obj, object_compat_props[i],
 482                                   i == 2 ? &error_fatal : &error_abort);
 483     }
 484 }
 485
 486 static void object_class_property_init_all(Object *obj)
 487 {
 488     ObjectPropertyIterator iter;
 489     ObjectProperty *prop;
 490
 491     object_class_property_iter_init(&iter, object_get_class(obj));
 492     while ((prop = object_property_iter_next(&iter))) {
 493         if (prop->init) {
 494             prop->init(obj, prop);
 495         }
 496     }
 497 }
 498
 499 static void object_initialize_with_type(Object *obj, size_t size, TypeImpl *type)
 500 {
 501     type_initialize(type);
 502
 503     g_assert(type->instance_size >= sizeof(Object));
 504     g_assert(type->abstract == false);
 505     g_assert(size >= type->instance_size);
 506
 507     memset(obj, 0, type->instance_size);
 508     obj->class = type->class;
 509     object_ref(obj);
 510     object_class_property_init_all(obj);
 511     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 512                                             NULL, object_property_free);
 513     object_init_with_type(obj, type);
 514     object_post_init_with_type(obj, type);
 515 }
 516
 517 void object_initialize(void *data, size_t size, const char *typename)
 518 {
 519     TypeImpl *type = type_get_by_name(typename);
 520
 521     if (!type) {
 522         error_report("missing object type '%s'", typename);
 523         abort();
 524     }
 525
 526     object_initialize_with_type(data, size, type);
 527 }
 528
 529 bool object_initialize_child_with_props(Object *parentobj,
 530                                         const char *propname,
 531                                         void *childobj, size_t size,
 532                                         const char *type,
 533                                         Error **errp, ...)
 534 {
 535     va_list vargs;
 536     bool ok;
 537
 538     va_start(vargs, errp);
 539     ok = object_initialize_child_with_propsv(parentobj, propname,
 540                                              childobj, size, type, errp,
 541                                              vargs);
 542     va_end(vargs);
 543     return ok;
 544 }
 545
 546 bool object_initialize_child_with_propsv(Object *parentobj,
 547                                          const char *propname,
 548                                          void *childobj, size_t size,
 549                                          const char *type,
 550                                          Error **errp, va_list vargs)
 551 {
 552     bool ok = false;
 553     Object *obj;
 554     UserCreatable *uc;
 555
 556     object_initialize(childobj, size, type);
 557     obj = OBJECT(childobj);
 558
 559     if (!object_set_propv(obj, errp, vargs)) {
 560         goto out;
 561     }
 562
 563     object_property_add_child(parentobj, propname, obj);
 564
 565     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 566     if (uc) {
 567         if (!user_creatable_complete(uc, errp)) {
 568             object_unparent(obj);
 569             goto out;
 570         }
 571     }
 572
 573     ok = true;
 574
 575 out:
 576     /*
 577      * We want @obj's reference to be 1 on success, 0 on failure.
 578      * On success, it's 2: one taken by object_initialize(), and one
 579      * by object_property_add_child().
 580      * On failure in object_initialize() or earlier, it's 1.
 581      * On failure afterwards, it's also 1: object_unparent() releases
 582      * the reference taken by object_property_add_child().
 583      */
 584     object_unref(obj);
 585     return ok;
 586 }
 587
 588 void object_initialize_child_internal(Object *parent,
 589                                       const char *propname,
 590                                       void *child, size_t size,
 591                                       const char *type)
 592 {
 593     object_initialize_child_with_props(parent, propname, child, size, type,
 594                                        &error_abort, NULL);
 595 }
 596
 597 static inline bool object_property_is_child(ObjectProperty *prop)
 598 {
 599     return strstart(prop->type, "child<", NULL);
 600 }
 601
 602 static void object_property_del_all(Object *obj)
 603 {
 604     g_autoptr(GHashTable) done = g_hash_table_new(NULL, NULL);
 605     ObjectProperty *prop;
 606     ObjectPropertyIterator iter;
 607     bool released;
 608
 609     do {
 610         released = false;
 611         object_property_iter_init(&iter, obj);
 612         while ((prop = object_property_iter_next(&iter)) != NULL) {
 613             if (g_hash_table_add(done, prop)) {
 614                 if (prop->release) {
 615                     prop->release(obj, prop->name, prop->opaque);
 616                     released = true;
 617                     break;
 618                 }
 619             }
 620         }
 621     } while (released);
 622
 623     g_hash_table_unref(obj->properties);
 624 }
 625
 626 static void object_property_del_child(Object *obj, Object *child)
 627 {
 628     ObjectProperty *prop;
 629     GHashTableIter iter;
 630     gpointer key, value;
 631
 632     g_hash_table_iter_init(&iter, obj->properties);
 633     while (g_hash_table_iter_next(&iter, &key, &value)) {
 634         prop = value;
 635         if (object_property_is_child(prop) && prop->opaque == child) {
 636             if (prop->release) {
 637                 prop->release(obj, prop->name, prop->opaque);
 638                 prop->release = NULL;
 639             }
 640             break;
 641         }
 642     }
 643     g_hash_table_iter_init(&iter, obj->properties);
 644     while (g_hash_table_iter_next(&iter, &key, &value)) {
 645         prop = value;
 646         if (object_property_is_child(prop) && prop->opaque == child) {
 647             g_hash_table_iter_remove(&iter);
 648             break;
 649         }
 650     }
 651 }
 652
 653 void object_unparent(Object *obj)
 654 {
 655     if (obj->parent) {
 656         object_property_del_child(obj->parent, obj);
 657     }
 658 }
 659
 660 static void object_deinit(Object *obj, TypeImpl *type)
 661 {
 662     if (type->instance_finalize) {
 663         type->instance_finalize(obj);
 664     }
 665
 666     if (type_has_parent(type)) {
 667         object_deinit(obj, type_get_parent(type));
 668     }
 669 }
 670
 671 static void object_finalize(void *data)
 672 {
 673     Object *obj = data;
 674     TypeImpl *ti = obj->class->type;
 675
 676     object_property_del_all(obj);
 677     object_deinit(obj, ti);
 678
 679     g_assert(obj->ref == 0);
 680     if (obj->free) {
 681         obj->free(obj);
 682     }
 683 }
 684
 685 static Object *object_new_with_type(Type type)
 686 {
 687     Object *obj;
 688
 689     g_assert(type != NULL);
 690     type_initialize(type);
 691
 692     obj = g_malloc(type->instance_size);
 693     object_initialize_with_type(obj, type->instance_size, type);
 694     obj->free = g_free;
 695
 696     return obj;
 697 }
 698
 699 Object *object_new_with_class(ObjectClass *klass)
 700 {
 701     return object_new_with_type(klass->type);
 702 }
 703
 704 Object *object_new(const char *typename)
 705 {
 706     TypeImpl *ti = type_get_by_name(typename);
 707
 708     return object_new_with_type(ti);
 709 }
 710
 711
 712 Object *object_new_with_props(const char *typename,
 713                               Object *parent,
 714                               const char *id,
 715                               Error **errp,
 716                               ...)
 717 {
 718     va_list vargs;
 719     Object *obj;
 720
 721     va_start(vargs, errp);
 722     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 723     va_end(vargs);
 724
 725     return obj;
 726 }
 727
 728
 729 Object *object_new_with_propv(const char *typename,
 730                               Object *parent,
 731                               const char *id,
 732                               Error **errp,
 733                               va_list vargs)
 734 {
 735     Object *obj;
 736     ObjectClass *klass;
 737     UserCreatable *uc;
 738
 739     klass = object_class_by_name(typename);
 740     if (!klass) {
 741         error_setg(errp, "invalid object type: %s", typename);
 742         return NULL;
 743     }
 744
 745     if (object_class_is_abstract(klass)) {
 746         error_setg(errp, "object type '%s' is abstract", typename);
 747         return NULL;
 748     }
 749     obj = object_new_with_type(klass->type);
 750
 751     if (!object_set_propv(obj, errp, vargs)) {
 752         goto error;
 753     }
 754
 755     if (id != NULL) {
 756         object_property_add_child(parent, id, obj);
 757     }
 758
 759     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 760     if (uc) {
 761         if (!user_creatable_complete(uc, errp)) {
 762             if (id != NULL) {
 763                 object_unparent(obj);
 764             }
 765             goto error;
 766         }
 767     }
 768
 769     object_unref(obj);
 770     return obj;
 771
 772  error:
 773     object_unref(obj);
 774     return NULL;
 775 }
 776
 777
 778 bool object_set_props(Object *obj,
 779                      Error **errp,
 780                      ...)
 781 {
 782     va_list vargs;
 783     bool ret;
 784
 785     va_start(vargs, errp);
 786     ret = object_set_propv(obj, errp, vargs);
 787     va_end(vargs);
 788
 789     return ret;
 790 }
 791
 792
 793 bool object_set_propv(Object *obj,
 794                      Error **errp,
 795                      va_list vargs)
 796 {
 797     const char *propname;
 798
 799     propname = va_arg(vargs, char *);
 800     while (propname != NULL) {
 801         const char *value = va_arg(vargs, char *);
 802
 803         g_assert(value != NULL);
 804         if (!object_property_parse(obj, propname, value, errp)) {
 805             return false;
 806         }
 807         propname = va_arg(vargs, char *);
 808     }
 809
 810     return true;
 811 }
 812
 813
 814 Object *object_dynamic_cast(Object *obj, const char *typename)
 815 {
 816     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 817         return obj;
 818     }
 819
 820     return NULL;
 821 }
 822
 823 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 824                                    const char *file, int line, const char *func)
 825 {
 826     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 827                                      typename, file, line, func);
 828
 829 #ifdef CONFIG_QOM_CAST_DEBUG
 830     int i;
 831     Object *inst;
 832
 833     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 834         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 835             goto out;
 836         }
 837     }
 838
 839     inst = object_dynamic_cast(obj, typename);
 840
 841     if (!inst && obj) {
 842         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 843                 file, line, func, obj, typename);
 844         abort();
 845     }
 846
 847     assert(obj == inst);
 848
 849     if (obj && obj == inst) {
 850         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 851             atomic_set(&obj->class->object_cast_cache[i - 1],
 852                        atomic_read(&obj->class->object_cast_cache[i]));
 853         }
 854         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 855     }
 856
 857 out:
 858 #endif
 859     return obj;
 860 }
 861
 862 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 863                                        const char *typename)
 864 {
 865     ObjectClass *ret = NULL;
 866     TypeImpl *target_type;
 867     TypeImpl *type;
 868
 869     if (!class) {
 870         return NULL;
 871     }
 872
 873     /* A simple fast path that can trigger a lot for leaf classes.  */
 874     type = class->type;
 875     if (type->name == typename) {
 876         return class;
 877     }
 878
 879     target_type = type_get_by_name(typename);
 880     if (!target_type) {
 881         /* target class type unknown, so fail the cast */
 882         return NULL;
 883     }
 884
 885     if (type->class->interfaces &&
 886             type_is_ancestor(target_type, type_interface)) {
 887         int found = 0;
 888         GSList *i;
 889
 890         for (i = class->interfaces; i; i = i->next) {
 891             ObjectClass *target_class = i->data;
 892
 893             if (type_is_ancestor(target_class->type, target_type)) {
 894                 ret = target_class;
 895                 found++;
 896             }
 897          }
 898
 899         /* The match was ambiguous, don't allow a cast */
 900         if (found > 1) {
 901             ret = NULL;
 902         }
 903     } else if (type_is_ancestor(type, target_type)) {
 904         ret = class;
 905     }
 906
 907     return ret;
 908 }
 909
 910 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 911                                               const char *typename,
 912                                               const char *file, int line,
 913                                               const char *func)
 914 {
 915     ObjectClass *ret;
 916
 917     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 918                                            typename, file, line, func);
 919
 920 #ifdef CONFIG_QOM_CAST_DEBUG
 921     int i;
 922
 923     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 924         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 925             ret = class;
 926             goto out;
 927         }
 928     }
 929 #else
 930     if (!class || !class->interfaces) {
 931         return class;
 932     }
 933 #endif
 934
 935     ret = object_class_dynamic_cast(class, typename);
 936     if (!ret && class) {
 937         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 938                 file, line, func, class, typename);
 939         abort();
 940     }
 941
 942 #ifdef CONFIG_QOM_CAST_DEBUG
 943     if (class && ret == class) {
 944         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 945             atomic_set(&class->class_cast_cache[i - 1],
 946                        atomic_read(&class->class_cast_cache[i]));
 947         }
 948         atomic_set(&class->class_cast_cache[i - 1], typename);
 949     }
 950 out:
 951 #endif
 952     return ret;
 953 }
 954
 955 const char *object_get_typename(const Object *obj)
 956 {
 957     return obj->class->type->name;
 958 }
 959
 960 ObjectClass *object_get_class(Object *obj)
 961 {
 962     return obj->class;
 963 }
 964
 965 bool object_class_is_abstract(ObjectClass *klass)
 966 {
 967     return klass->type->abstract;
 968 }
 969
 970 const char *object_class_get_name(ObjectClass *klass)
 971 {
 972     return klass->type->name;
 973 }
 974
 975 ObjectClass *object_class_by_name(const char *typename)
 976 {
 977     TypeImpl *type = type_get_by_name(typename);
 978
 979     if (!type) {
 980         return NULL;
 981     }
 982
 983     type_initialize(type);
 984
 985     return type->class;
 986 }
 987
 988 ObjectClass *module_object_class_by_name(const char *typename)
 989 {
 990     ObjectClass *oc;
 991
 992     oc = object_class_by_name(typename);
 993 #ifdef CONFIG_MODULES
 994     if (!oc) {
 995         module_load_qom_one(typename);
 996         oc = object_class_by_name(typename);
 997     }
 998 #endif
 999     return oc;
1000 }
1001
1002 ObjectClass *object_class_get_parent(ObjectClass *class)
1003 {
1004     TypeImpl *type = type_get_parent(class->type);
1005
1006     if (!type) {
1007         return NULL;
1008     }
1009
1010     type_initialize(type);
1011
1012     return type->class;
1013 }
1014
1015 typedef struct OCFData
1016 {
1017     void (*fn)(ObjectClass *klass, void *opaque);
1018     const char *implements_type;
1019     bool include_abstract;
1020     void *opaque;
1021 } OCFData;
1022
1023 static void object_class_foreach_tramp(gpointer key, gpointer value,
1024                                        gpointer opaque)
1025 {
1026     OCFData *data = opaque;
1027     TypeImpl *type = value;
1028     ObjectClass *k;
1029
1030     type_initialize(type);
1031     k = type->class;
1032
1033     if (!data->include_abstract && type->abstract) {
1034         return;
1035     }
1036
1037     if (data->implements_type &&
1038         !object_class_dynamic_cast(k, data->implements_type)) {
1039         return;
1040     }
1041
1042     data->fn(k, data->opaque);
1043 }
1044
1045 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
1046                           const char *implements_type, bool include_abstract,
1047                           void *opaque)
1048 {
1049     OCFData data = { fn, implements_type, include_abstract, opaque };
1050
1051     enumerating_types = true;
1052     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
1053     enumerating_types = false;
1054 }
1055
1056 static int do_object_child_foreach(Object *obj,
1057                                    int (*fn)(Object *child, void *opaque),
1058                                    void *opaque, bool recurse)
1059 {
1060     GHashTableIter iter;
1061     ObjectProperty *prop;
1062     int ret = 0;
1063
1064     g_hash_table_iter_init(&iter, obj->properties);
1065     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1066         if (object_property_is_child(prop)) {
1067             Object *child = prop->opaque;
1068
1069             ret = fn(child, opaque);
1070             if (ret != 0) {
1071                 break;
1072             }
1073             if (recurse) {
1074                 ret = do_object_child_foreach(child, fn, opaque, true);
1075                 if (ret != 0) {
1076                     break;
1077                 }
1078             }
1079         }
1080     }
1081     return ret;
1082 }
1083
1084 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
1085                          void *opaque)
1086 {
1087     return do_object_child_foreach(obj, fn, opaque, false);
1088 }
1089
1090 int object_child_foreach_recursive(Object *obj,
1091                                    int (*fn)(Object *child, void *opaque),
1092                                    void *opaque)
1093 {
1094     return do_object_child_foreach(obj, fn, opaque, true);
1095 }
1096
1097 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
1098 {
1099     GSList **list = opaque;
1100
1101     *list = g_slist_prepend(*list, klass);
1102 }
1103
1104 GSList *object_class_get_list(const char *implements_type,
1105                               bool include_abstract)
1106 {
1107     GSList *list = NULL;
1108
1109     object_class_foreach(object_class_get_list_tramp,
1110                          implements_type, include_abstract, &list);
1111     return list;
1112 }
1113
1114 static gint object_class_cmp(gconstpointer a, gconstpointer b)
1115 {
1116     return strcasecmp(object_class_get_name((ObjectClass *)a),
1117                       object_class_get_name((ObjectClass *)b));
1118 }
1119
1120 GSList *object_class_get_list_sorted(const char *implements_type,
1121                                      bool include_abstract)
1122 {
1123     return g_slist_sort(object_class_get_list(implements_type, include_abstract),
1124                         object_class_cmp);
1125 }
1126
1127 Object *object_ref(void *objptr)
1128 {
1129     Object *obj = OBJECT(objptr);
1130     if (!obj) {
1131         return NULL;
1132     }
1133     atomic_inc(&obj->ref);
1134     return obj;
1135 }
1136
1137 void object_unref(void *objptr)
1138 {
1139     Object *obj = OBJECT(objptr);
1140     if (!obj) {
1141         return;
1142     }
1143     g_assert(obj->ref > 0);
1144
1145     /* parent always holds a reference to its children */
1146     if (atomic_fetch_dec(&obj->ref) == 1) {
1147         object_finalize(obj);
1148     }
1149 }
1150
1151 ObjectProperty *
1152 object_property_try_add(Object *obj, const char *name, const char *type,
1153                         ObjectPropertyAccessor *get,
1154                         ObjectPropertyAccessor *set,
1155                         ObjectPropertyRelease *release,
1156                         void *opaque, Error **errp)
1157 {
1158     ObjectProperty *prop;
1159     size_t name_len = strlen(name);
1160
1161     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
1162         int i;
1163         ObjectProperty *ret;
1164         char *name_no_array = g_strdup(name);
1165
1166         name_no_array[name_len - 3] = '\0';
1167         for (i = 0; ; ++i) {
1168             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
1169
1170             ret = object_property_try_add(obj, full_name, type, get, set,
1171                                           release, opaque, NULL);
1172             g_free(full_name);
1173             if (ret) {
1174                 break;
1175             }
1176         }
1177         g_free(name_no_array);
1178         return ret;
1179     }
1180
1181     if (object_property_find(obj, name, NULL) != NULL) {
1182         error_setg(errp, "attempt to add duplicate property '%s' to object (type '%s')",
1183                    name, object_get_typename(obj));
1184         return NULL;
1185     }
1186
1187     prop = g_malloc0(sizeof(*prop));
1188
1189     prop->name = g_strdup(name);
1190     prop->type = g_strdup(type);
1191
1192     prop->get = get;
1193     prop->set = set;
1194     prop->release = release;
1195     prop->opaque = opaque;
1196
1197     g_hash_table_insert(obj->properties, prop->name, prop);
1198     return prop;
1199 }
1200
1201 ObjectProperty *
1202 object_property_add(Object *obj, const char *name, const char *type,
1203                     ObjectPropertyAccessor *get,
1204                     ObjectPropertyAccessor *set,
1205                     ObjectPropertyRelease *release,
1206                     void *opaque)
1207 {
1208     return object_property_try_add(obj, name, type, get, set, release,
1209                                    opaque, &error_abort);
1210 }
1211
1212 ObjectProperty *
1213 object_class_property_add(ObjectClass *klass,
1214                           const char *name,
1215                           const char *type,
1216                           ObjectPropertyAccessor *get,
1217                           ObjectPropertyAccessor *set,
1218                           ObjectPropertyRelease *release,
1219                           void *opaque)
1220 {
1221     ObjectProperty *prop;
1222
1223     assert(!object_class_property_find(klass, name, NULL));
1224
1225     prop = g_malloc0(sizeof(*prop));
1226
1227     prop->name = g_strdup(name);
1228     prop->type = g_strdup(type);
1229
1230     prop->get = get;
1231     prop->set = set;
1232     prop->release = release;
1233     prop->opaque = opaque;
1234
1235     g_hash_table_insert(klass->properties, prop->name, prop);
1236
1237     return prop;
1238 }
1239
1240 ObjectProperty *object_property_find(Object *obj, const char *name,
1241                                      Error **errp)
1242 {
1243     ObjectProperty *prop;
1244     ObjectClass *klass = object_get_class(obj);
1245
1246     prop = object_class_property_find(klass, name, NULL);
1247     if (prop) {
1248         return prop;
1249     }
1250
1251     prop = g_hash_table_lookup(obj->properties, name);
1252     if (prop) {
1253         return prop;
1254     }
1255
1256     error_setg(errp, "Property '.%s' not found", name);
1257     return NULL;
1258 }
1259
1260 void object_property_iter_init(ObjectPropertyIterator *iter,
1261                                Object *obj)
1262 {
1263     g_hash_table_iter_init(&iter->iter, obj->properties);
1264     iter->nextclass = object_get_class(obj);
1265 }
1266
1267 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1268 {
1269     gpointer key, val;
1270     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1271         if (!iter->nextclass) {
1272             return NULL;
1273         }
1274         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1275         iter->nextclass = object_class_get_parent(iter->nextclass);
1276     }
1277     return val;
1278 }
1279
1280 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1281                                      ObjectClass *klass)
1282 {
1283     g_hash_table_iter_init(&iter->iter, klass->properties);
1284     iter->nextclass = object_class_get_parent(klass);
1285 }
1286
1287 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1288                                            Error **errp)
1289 {
1290     ObjectProperty *prop;
1291     ObjectClass *parent_klass;
1292
1293     parent_klass = object_class_get_parent(klass);
1294     if (parent_klass) {
1295         prop = object_class_property_find(parent_klass, name, NULL);
1296         if (prop) {
1297             return prop;
1298         }
1299     }
1300
1301     prop = g_hash_table_lookup(klass->properties, name);
1302     if (!prop) {
1303         error_setg(errp, "Property '.%s' not found", name);
1304     }
1305     return prop;
1306 }
1307
1308 void object_property_del(Object *obj, const char *name)
1309 {
1310     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1311
1312     if (prop->release) {
1313         prop->release(obj, name, prop->opaque);
1314     }
1315     g_hash_table_remove(obj->properties, name);
1316 }
1317
1318 bool object_property_get(Object *obj, const char *name, Visitor *v,
1319                          Error **errp)
1320 {
1321     Error *err = NULL;
1322     ObjectProperty *prop = object_property_find(obj, name, errp);
1323
1324     if (prop == NULL) {
1325         return false;
1326     }
1327
1328     if (!prop->get) {
1329         error_setg(errp, QERR_PERMISSION_DENIED);
1330         return false;
1331     }
1332     prop->get(obj, v, name, prop->opaque, &err);
1333     error_propagate(errp, err);
1334     return !err;
1335 }
1336
1337 bool object_property_set(Object *obj, const char *name, Visitor *v,
1338                          Error **errp)
1339 {
1340     Error *err = NULL;
1341     ObjectProperty *prop = object_property_find(obj, name, errp);
1342
1343     if (prop == NULL) {
1344         return false;
1345     }
1346
1347     if (!prop->set) {
1348         error_setg(errp, QERR_PERMISSION_DENIED);
1349         return false;
1350     }
1351     prop->set(obj, v, name, prop->opaque, &err);
1352     error_propagate(errp, err);
1353     return !err;
1354 }
1355
1356 bool object_property_set_str(Object *obj, const char *name,
1357                              const char *value, Error **errp)
1358 {
1359     QString *qstr = qstring_from_str(value);
1360     bool ok = object_property_set_qobject(obj, name, QOBJECT(qstr), errp);
1361
1362     qobject_unref(qstr);
1363     return ok;
1364 }
1365
1366 char *object_property_get_str(Object *obj, const char *name,
1367                               Error **errp)
1368 {
1369     QObject *ret = object_property_get_qobject(obj, name, errp);
1370     char *retval;
1371
1372     if (!ret) {
1373         return NULL;
1374     }
1375
1376     retval = g_strdup(qobject_get_try_str(ret));
1377     if (!retval) {
1378         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1379     }
1380
1381     qobject_unref(ret);
1382     return retval;
1383 }
1384
1385 bool object_property_set_link(Object *obj, const char *name,
1386                               Object *value, Error **errp)
1387 {
1388     g_autofree char *path = NULL;
1389
1390     if (value) {
1391         path = object_get_canonical_path(value);
1392     }
1393     return object_property_set_str(obj, name, path ?: "", errp);
1394 }
1395
1396 Object *object_property_get_link(Object *obj, const char *name,
1397                                  Error **errp)
1398 {
1399     char *str = object_property_get_str(obj, name, errp);
1400     Object *target = NULL;
1401
1402     if (str && *str) {
1403         target = object_resolve_path(str, NULL);
1404         if (!target) {
1405             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1406                       "Device '%s' not found", str);
1407         }
1408     }
1409
1410     g_free(str);
1411     return target;
1412 }
1413
1414 bool object_property_set_bool(Object *obj, const char *name,
1415                               bool value, Error **errp)
1416 {
1417     QBool *qbool = qbool_from_bool(value);
1418     bool ok = object_property_set_qobject(obj, name, QOBJECT(qbool), errp);
1419
1420     qobject_unref(qbool);
1421     return ok;
1422 }
1423
1424 bool object_property_get_bool(Object *obj, const char *name,
1425                               Error **errp)
1426 {
1427     QObject *ret = object_property_get_qobject(obj, name, errp);
1428     QBool *qbool;
1429     bool retval;
1430
1431     if (!ret) {
1432         return false;
1433     }
1434     qbool = qobject_to(QBool, ret);
1435     if (!qbool) {
1436         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1437         retval = false;
1438     } else {
1439         retval = qbool_get_bool(qbool);
1440     }
1441
1442     qobject_unref(ret);
1443     return retval;
1444 }
1445
1446 bool object_property_set_int(Object *obj, const char *name,
1447                              int64_t value, Error **errp)
1448 {
1449     QNum *qnum = qnum_from_int(value);
1450     bool ok = object_property_set_qobject(obj, name, QOBJECT(qnum), errp);
1451
1452     qobject_unref(qnum);
1453     return ok;
1454 }
1455
1456 int64_t object_property_get_int(Object *obj, const char *name,
1457                                 Error **errp)
1458 {
1459     QObject *ret = object_property_get_qobject(obj, name, errp);
1460     QNum *qnum;
1461     int64_t retval;
1462
1463     if (!ret) {
1464         return -1;
1465     }
1466
1467     qnum = qobject_to(QNum, ret);
1468     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1469         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1470         retval = -1;
1471     }
1472
1473     qobject_unref(ret);
1474     return retval;
1475 }
1476
1477 static void object_property_init_defval(Object *obj, ObjectProperty *prop)
1478 {
1479     Visitor *v = qobject_input_visitor_new(prop->defval);
1480
1481     assert(prop->set != NULL);
1482     prop->set(obj, v, prop->name, prop->opaque, &error_abort);
1483
1484     visit_free(v);
1485 }
1486
1487 static void object_property_set_default(ObjectProperty *prop, QObject *defval)
1488 {
1489     assert(!prop->defval);
1490     assert(!prop->init);
1491
1492     prop->defval = defval;
1493     prop->init = object_property_init_defval;
1494 }
1495
1496 void object_property_set_default_bool(ObjectProperty *prop, bool value)
1497 {
1498     object_property_set_default(prop, QOBJECT(qbool_from_bool(value)));
1499 }
1500
1501 void object_property_set_default_str(ObjectProperty *prop, const char *value)
1502 {
1503     object_property_set_default(prop, QOBJECT(qstring_from_str(value)));
1504 }
1505
1506 void object_property_set_default_int(ObjectProperty *prop, int64_t value)
1507 {
1508     object_property_set_default(prop, QOBJECT(qnum_from_int(value)));
1509 }
1510
1511 void object_property_set_default_uint(ObjectProperty *prop, uint64_t value)
1512 {
1513     object_property_set_default(prop, QOBJECT(qnum_from_uint(value)));
1514 }
1515
1516 bool object_property_set_uint(Object *obj, const char *name,
1517                               uint64_t value, Error **errp)
1518 {
1519     QNum *qnum = qnum_from_uint(value);
1520     bool ok = object_property_set_qobject(obj, name, QOBJECT(qnum), errp);
1521
1522     qobject_unref(qnum);
1523     return ok;
1524 }
1525
1526 uint64_t object_property_get_uint(Object *obj, const char *name,
1527                                   Error **errp)
1528 {
1529     QObject *ret = object_property_get_qobject(obj, name, errp);
1530     QNum *qnum;
1531     uint64_t retval;
1532
1533     if (!ret) {
1534         return 0;
1535     }
1536     qnum = qobject_to(QNum, ret);
1537     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1538         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1539         retval = 0;
1540     }
1541
1542     qobject_unref(ret);
1543     return retval;
1544 }
1545
1546 typedef struct EnumProperty {
1547     const QEnumLookup *lookup;
1548     int (*get)(Object *, Error **);
1549     void (*set)(Object *, int, Error **);
1550 } EnumProperty;
1551
1552 int object_property_get_enum(Object *obj, const char *name,
1553                              const char *typename, Error **errp)
1554 {
1555     char *str;
1556     int ret;
1557     ObjectProperty *prop = object_property_find(obj, name, errp);
1558     EnumProperty *enumprop;
1559
1560     if (prop == NULL) {
1561         return 0;
1562     }
1563
1564     if (!g_str_equal(prop->type, typename)) {
1565         error_setg(errp, "Property %s on %s is not '%s' enum type",
1566                    name, object_class_get_name(
1567                        object_get_class(obj)), typename);
1568         return 0;
1569     }
1570
1571     enumprop = prop->opaque;
1572
1573     str = object_property_get_str(obj, name, errp);
1574     if (!str) {
1575         return 0;
1576     }
1577
1578     ret = qapi_enum_parse(enumprop->lookup, str, -1, errp);
1579     g_free(str);
1580
1581     return ret;
1582 }
1583
1584 bool object_property_parse(Object *obj, const char *name,
1585                            const char *string, Error **errp)
1586 {
1587     Visitor *v = string_input_visitor_new(string);
1588     bool ok = object_property_set(obj, name, v, errp);
1589
1590     visit_free(v);
1591     return ok;
1592 }
1593
1594 char *object_property_print(Object *obj, const char *name, bool human,
1595                             Error **errp)
1596 {
1597     Visitor *v;
1598     char *string = NULL;
1599
1600     v = string_output_visitor_new(human, &string);
1601     if (!object_property_get(obj, name, v, errp)) {
1602         goto out;
1603     }
1604
1605     visit_complete(v, &string);
1606
1607 out:
1608     visit_free(v);
1609     return string;
1610 }
1611
1612 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1613 {
1614     ObjectProperty *prop = object_property_find(obj, name, errp);
1615     if (prop == NULL) {
1616         return NULL;
1617     }
1618
1619     return prop->type;
1620 }
1621
1622 Object *object_get_root(void)
1623 {
1624     static Object *root;
1625
1626     if (!root) {
1627         root = object_new("container");
1628     }
1629
1630     return root;
1631 }
1632
1633 Object *object_get_objects_root(void)
1634 {
1635     return container_get(object_get_root(), "/objects");
1636 }
1637
1638 Object *object_get_internal_root(void)
1639 {
1640     static Object *internal_root;
1641
1642     if (!internal_root) {
1643         internal_root = object_new("container");
1644     }
1645
1646     return internal_root;
1647 }
1648
1649 static void object_get_child_property(Object *obj, Visitor *v,
1650                                       const char *name, void *opaque,
1651                                       Error **errp)
1652 {
1653     Object *child = opaque;
1654     char *path;
1655
1656     path = object_get_canonical_path(child);
1657     visit_type_str(v, name, &path, errp);
1658     g_free(path);
1659 }
1660
1661 static Object *object_resolve_child_property(Object *parent, void *opaque,
1662                                              const char *part)
1663 {
1664     return opaque;
1665 }
1666
1667 static void object_finalize_child_property(Object *obj, const char *name,
1668                                            void *opaque)
1669 {
1670     Object *child = opaque;
1671
1672     if (child->class->unparent) {
1673         (child->class->unparent)(child);
1674     }
1675     child->parent = NULL;
1676     object_unref(child);
1677 }
1678
1679 ObjectProperty *
1680 object_property_try_add_child(Object *obj, const char *name,
1681                               Object *child, Error **errp)
1682 {
1683     g_autofree char *type = NULL;
1684     ObjectProperty *op;
1685
1686     assert(!child->parent);
1687
1688     type = g_strdup_printf("child<%s>", object_get_typename(child));
1689
1690     op = object_property_try_add(obj, name, type, object_get_child_property,
1691                                  NULL, object_finalize_child_property,
1692                                  child, errp);
1693     if (!op) {
1694         return NULL;
1695     }
1696     op->resolve = object_resolve_child_property;
1697     object_ref(child);
1698     child->parent = obj;
1699     return op;
1700 }
1701
1702 ObjectProperty *
1703 object_property_add_child(Object *obj, const char *name,
1704                           Object *child)
1705 {
1706     return object_property_try_add_child(obj, name, child, &error_abort);
1707 }
1708
1709 void object_property_allow_set_link(const Object *obj, const char *name,
1710                                     Object *val, Error **errp)
1711 {
1712     /* Allow the link to be set, always */
1713 }
1714
1715 typedef struct {
1716     union {
1717         Object **targetp;
1718         Object *target; /* if OBJ_PROP_LINK_DIRECT, when holding the pointer  */
1719         ptrdiff_t offset; /* if OBJ_PROP_LINK_CLASS */
1720     };
1721     void (*check)(const Object *, const char *, Object *, Error **);
1722     ObjectPropertyLinkFlags flags;
1723 } LinkProperty;
1724
1725 static Object **
1726 object_link_get_targetp(Object *obj, LinkProperty *lprop)
1727 {
1728     if (lprop->flags & OBJ_PROP_LINK_DIRECT) {
1729         return &lprop->target;
1730     } else if (lprop->flags & OBJ_PROP_LINK_CLASS) {
1731         return (void *)obj + lprop->offset;
1732     } else {
1733         return lprop->targetp;
1734     }
1735 }
1736
1737 static void object_get_link_property(Object *obj, Visitor *v,
1738                                      const char *name, void *opaque,
1739                                      Error **errp)
1740 {
1741     LinkProperty *lprop = opaque;
1742     Object **targetp = object_link_get_targetp(obj, lprop);
1743     char *path;
1744
1745     if (*targetp) {
1746         path = object_get_canonical_path(*targetp);
1747         visit_type_str(v, name, &path, errp);
1748         g_free(path);
1749     } else {
1750         path = (char *)"";
1751         visit_type_str(v, name, &path, errp);
1752     }
1753 }
1754
1755 /*
1756  * object_resolve_link:
1757  *
1758  * Lookup an object and ensure its type matches the link property type.  This
1759  * is similar to object_resolve_path() except type verification against the
1760  * link property is performed.
1761  *
1762  * Returns: The matched object or NULL on path lookup failures.
1763  */
1764 static Object *object_resolve_link(Object *obj, const char *name,
1765                                    const char *path, Error **errp)
1766 {
1767     const char *type;
1768     char *target_type;
1769     bool ambiguous = false;
1770     Object *target;
1771
1772     /* Go from link<FOO> to FOO.  */
1773     type = object_property_get_type(obj, name, NULL);
1774     target_type = g_strndup(&type[5], strlen(type) - 6);
1775     target = object_resolve_path_type(path, target_type, &ambiguous);
1776
1777     if (ambiguous) {
1778         error_setg(errp, "Path '%s' does not uniquely identify an object",
1779                    path);
1780     } else if (!target) {
1781         target = object_resolve_path(path, &ambiguous);
1782         if (target || ambiguous) {
1783             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1784         } else {
1785             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1786                       "Device '%s' not found", path);
1787         }
1788         target = NULL;
1789     }
1790     g_free(target_type);
1791
1792     return target;
1793 }
1794
1795 static void object_set_link_property(Object *obj, Visitor *v,
1796                                      const char *name, void *opaque,
1797                                      Error **errp)
1798 {
1799     Error *local_err = NULL;
1800     LinkProperty *prop = opaque;
1801     Object **targetp = object_link_get_targetp(obj, prop);
1802     Object *old_target = *targetp;
1803     Object *new_target;
1804     char *path = NULL;
1805
1806     if (!visit_type_str(v, name, &path, errp)) {
1807         return;
1808     }
1809
1810     if (*path) {
1811         new_target = object_resolve_link(obj, name, path, errp);
1812         if (!new_target) {
1813             g_free(path);
1814             return;
1815         }
1816     } else {
1817         new_target = NULL;
1818     }
1819
1820     g_free(path);
1821
1822     prop->check(obj, name, new_target, &local_err);
1823     if (local_err) {
1824         error_propagate(errp, local_err);
1825         return;
1826     }
1827
1828     *targetp = new_target;
1829     if (prop->flags & OBJ_PROP_LINK_STRONG) {
1830         object_ref(new_target);
1831         object_unref(old_target);
1832     }
1833 }
1834
1835 static Object *object_resolve_link_property(Object *parent, void *opaque,
1836                                             const char *part)
1837 {
1838     LinkProperty *lprop = opaque;
1839
1840     return *object_link_get_targetp(parent, lprop);
1841 }
1842
1843 static void object_release_link_property(Object *obj, const char *name,
1844                                          void *opaque)
1845 {
1846     LinkProperty *prop = opaque;
1847     Object **targetp = object_link_get_targetp(obj, prop);
1848
1849     if ((prop->flags & OBJ_PROP_LINK_STRONG) && *targetp) {
1850         object_unref(*targetp);
1851     }
1852     if (!(prop->flags & OBJ_PROP_LINK_CLASS)) {
1853         g_free(prop);
1854     }
1855 }
1856
1857 static ObjectProperty *
1858 object_add_link_prop(Object *obj, const char *name,
1859                      const char *type, void *ptr,
1860                      void (*check)(const Object *, const char *,
1861                                    Object *, Error **),
1862                      ObjectPropertyLinkFlags flags)
1863 {
1864     LinkProperty *prop = g_malloc(sizeof(*prop));
1865     g_autofree char *full_type = NULL;
1866     ObjectProperty *op;
1867
1868     if (flags & OBJ_PROP_LINK_DIRECT) {
1869         prop->target = ptr;
1870     } else {
1871         prop->targetp = ptr;
1872     }
1873     prop->check = check;
1874     prop->flags = flags;
1875
1876     full_type = g_strdup_printf("link<%s>", type);
1877
1878     op = object_property_add(obj, name, full_type,
1879                              object_get_link_property,
1880                              check ? object_set_link_property : NULL,
1881                              object_release_link_property,
1882                              prop);
1883     op->resolve = object_resolve_link_property;
1884     return op;
1885 }
1886
1887 ObjectProperty *
1888 object_property_add_link(Object *obj, const char *name,
1889                          const char *type, Object **targetp,
1890                          void (*check)(const Object *, const char *,
1891                                        Object *, Error **),
1892                          ObjectPropertyLinkFlags flags)
1893 {
1894     return object_add_link_prop(obj, name, type, targetp, check, flags);
1895 }
1896
1897 ObjectProperty *
1898 object_class_property_add_link(ObjectClass *oc,
1899     const char *name,
1900     const char *type, ptrdiff_t offset,
1901     void (*check)(const Object *obj, const char *name,
1902                   Object *val, Error **errp),
1903     ObjectPropertyLinkFlags flags)
1904 {
1905     LinkProperty *prop = g_new0(LinkProperty, 1);
1906     char *full_type;
1907     ObjectProperty *op;
1908
1909     prop->offset = offset;
1910     prop->check = check;
1911     prop->flags = flags | OBJ_PROP_LINK_CLASS;
1912
1913     full_type = g_strdup_printf("link<%s>", type);
1914
1915     op = object_class_property_add(oc, name, full_type,
1916                                    object_get_link_property,
1917                                    check ? object_set_link_property : NULL,
1918                                    object_release_link_property,
1919                                    prop);
1920
1921     op->resolve = object_resolve_link_property;
1922
1923     g_free(full_type);
1924     return op;
1925 }
1926
1927 ObjectProperty *
1928 object_property_add_const_link(Object *obj, const char *name,
1929                                Object *target)
1930 {
1931     return object_add_link_prop(obj, name,
1932                                 object_get_typename(target), target,
1933                                 NULL, OBJ_PROP_LINK_DIRECT);
1934 }
1935
1936 const char *object_get_canonical_path_component(const Object *obj)
1937 {
1938     ObjectProperty *prop = NULL;
1939     GHashTableIter iter;
1940
1941     if (obj->parent == NULL) {
1942         return NULL;
1943     }
1944
1945     g_hash_table_iter_init(&iter, obj->parent->properties);
1946     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1947         if (!object_property_is_child(prop)) {
1948             continue;
1949         }
1950
1951         if (prop->opaque == obj) {
1952             return prop->name;
1953         }
1954     }
1955
1956     /* obj had a parent but was not a child, should never happen */
1957     g_assert_not_reached();
1958     return NULL;
1959 }
1960
1961 char *object_get_canonical_path(const Object *obj)
1962 {
1963     Object *root = object_get_root();
1964     char *newpath, *path = NULL;
1965
1966     if (obj == root) {
1967         return g_strdup("/");
1968     }
1969
1970     do {
1971         const char *component = object_get_canonical_path_component(obj);
1972
1973         if (!component) {
1974             /* A canonical path must be complete, so discard what was
1975              * collected so far.
1976              */
1977             g_free(path);
1978             return NULL;
1979         }
1980
1981         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
1982         g_free(path);
1983         path = newpath;
1984         obj = obj->parent;
1985     } while (obj != root);
1986
1987     return path;
1988 }
1989
1990 Object *object_resolve_path_component(Object *parent, const char *part)
1991 {
1992     ObjectProperty *prop = object_property_find(parent, part, NULL);
1993     if (prop == NULL) {
1994         return NULL;
1995     }
1996
1997     if (prop->resolve) {
1998         return prop->resolve(parent, prop->opaque, part);
1999     } else {
2000         return NULL;
2001     }
2002 }
2003
2004 static Object *object_resolve_abs_path(Object *parent,
2005                                           char **parts,
2006                                           const char *typename)
2007 {
2008     Object *child;
2009
2010     if (*parts == NULL) {
2011         return object_dynamic_cast(parent, typename);
2012     }
2013
2014     if (strcmp(*parts, "") == 0) {
2015         return object_resolve_abs_path(parent, parts + 1, typename);
2016     }
2017
2018     child = object_resolve_path_component(parent, *parts);
2019     if (!child) {
2020         return NULL;
2021     }
2022
2023     return object_resolve_abs_path(child, parts + 1, typename);
2024 }
2025
2026 static Object *object_resolve_partial_path(Object *parent,
2027                                            char **parts,
2028                                            const char *typename,
2029                                            bool *ambiguous)
2030 {
2031     Object *obj;
2032     GHashTableIter iter;
2033     ObjectProperty *prop;
2034
2035     obj = object_resolve_abs_path(parent, parts, typename);
2036
2037     g_hash_table_iter_init(&iter, parent->properties);
2038     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
2039         Object *found;
2040
2041         if (!object_property_is_child(prop)) {
2042             continue;
2043         }
2044
2045         found = object_resolve_partial_path(prop->opaque, parts,
2046                                             typename, ambiguous);
2047         if (found) {
2048             if (obj) {
2049                 *ambiguous = true;
2050                 return NULL;
2051             }
2052             obj = found;
2053         }
2054
2055         if (*ambiguous) {
2056             return NULL;
2057         }
2058     }
2059
2060     return obj;
2061 }
2062
2063 Object *object_resolve_path_type(const char *path, const char *typename,
2064                                  bool *ambiguousp)
2065 {
2066     Object *obj;
2067     char **parts;
2068
2069     parts = g_strsplit(path, "/", 0);
2070     assert(parts);
2071
2072     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
2073         bool ambiguous = false;
2074         obj = object_resolve_partial_path(object_get_root(), parts,
2075                                           typename, &ambiguous);
2076         if (ambiguousp) {
2077             *ambiguousp = ambiguous;
2078         }
2079     } else {
2080         obj = object_resolve_abs_path(object_get_root(), parts + 1, typename);
2081     }
2082
2083     g_strfreev(parts);
2084
2085     return obj;
2086 }
2087
2088 Object *object_resolve_path(const char *path, bool *ambiguous)
2089 {
2090     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
2091 }
2092
2093 typedef struct StringProperty
2094 {
2095     char *(*get)(Object *, Error **);
2096     void (*set)(Object *, const char *, Error **);
2097 } StringProperty;
2098
2099 static void property_get_str(Object *obj, Visitor *v, const char *name,
2100                              void *opaque, Error **errp)
2101 {
2102     StringProperty *prop = opaque;
2103     char *value;
2104     Error *err = NULL;
2105
2106     value = prop->get(obj, &err);
2107     if (err) {
2108         error_propagate(errp, err);
2109         return;
2110     }
2111
2112     visit_type_str(v, name, &value, errp);
2113     g_free(value);
2114 }
2115
2116 static void property_set_str(Object *obj, Visitor *v, const char *name,
2117                              void *opaque, Error **errp)
2118 {
2119     StringProperty *prop = opaque;
2120     char *value;
2121
2122     if (!visit_type_str(v, name, &value, errp)) {
2123         return;
2124     }
2125
2126     prop->set(obj, value, errp);
2127     g_free(value);
2128 }
2129
2130 static void property_release_str(Object *obj, const char *name,
2131                                  void *opaque)
2132 {
2133     StringProperty *prop = opaque;
2134     g_free(prop);
2135 }
2136
2137 ObjectProperty *
2138 object_property_add_str(Object *obj, const char *name,
2139                         char *(*get)(Object *, Error **),
2140                         void (*set)(Object *, const char *, Error **))
2141 {
2142     StringProperty *prop = g_malloc0(sizeof(*prop));
2143
2144     prop->get = get;
2145     prop->set = set;
2146
2147     return object_property_add(obj, name, "string",
2148                                get ? property_get_str : NULL,
2149                                set ? property_set_str : NULL,
2150                                property_release_str,
2151                                prop);
2152 }
2153
2154 ObjectProperty *
2155 object_class_property_add_str(ObjectClass *klass, const char *name,
2156                                    char *(*get)(Object *, Error **),
2157                                    void (*set)(Object *, const char *,
2158                                                Error **))
2159 {
2160     StringProperty *prop = g_malloc0(sizeof(*prop));
2161
2162     prop->get = get;
2163     prop->set = set;
2164
2165     return object_class_property_add(klass, name, "string",
2166                                      get ? property_get_str : NULL,
2167                                      set ? property_set_str : NULL,
2168                                      NULL,
2169                                      prop);
2170 }
2171
2172 typedef struct BoolProperty
2173 {
2174     bool (*get)(Object *, Error **);
2175     void (*set)(Object *, bool, Error **);
2176 } BoolProperty;
2177
2178 static void property_get_bool(Object *obj, Visitor *v, const char *name,
2179                               void *opaque, Error **errp)
2180 {
2181     BoolProperty *prop = opaque;
2182     bool value;
2183     Error *err = NULL;
2184
2185     value = prop->get(obj, &err);
2186     if (err) {
2187         error_propagate(errp, err);
2188         return;
2189     }
2190
2191     visit_type_bool(v, name, &value, errp);
2192 }
2193
2194 static void property_set_bool(Object *obj, Visitor *v, const char *name,
2195                               void *opaque, Error **errp)
2196 {
2197     BoolProperty *prop = opaque;
2198     bool value;
2199
2200     if (!visit_type_bool(v, name, &value, errp)) {
2201         return;
2202     }
2203
2204     prop->set(obj, value, errp);
2205 }
2206
2207 static void property_release_bool(Object *obj, const char *name,
2208                                   void *opaque)
2209 {
2210     BoolProperty *prop = opaque;
2211     g_free(prop);
2212 }
2213
2214 ObjectProperty *
2215 object_property_add_bool(Object *obj, const char *name,
2216                          bool (*get)(Object *, Error **),
2217                          void (*set)(Object *, bool, Error **))
2218 {
2219     BoolProperty *prop = g_malloc0(sizeof(*prop));
2220
2221     prop->get = get;
2222     prop->set = set;
2223
2224     return object_property_add(obj, name, "bool",
2225                                get ? property_get_bool : NULL,
2226                                set ? property_set_bool : NULL,
2227                                property_release_bool,
2228                                prop);
2229 }
2230
2231 ObjectProperty *
2232 object_class_property_add_bool(ObjectClass *klass, const char *name,
2233                                     bool (*get)(Object *, Error **),
2234                                     void (*set)(Object *, bool, Error **))
2235 {
2236     BoolProperty *prop = g_malloc0(sizeof(*prop));
2237
2238     prop->get = get;
2239     prop->set = set;
2240
2241     return object_class_property_add(klass, name, "bool",
2242                                      get ? property_get_bool : NULL,
2243                                      set ? property_set_bool : NULL,
2244                                      NULL,
2245                                      prop);
2246 }
2247
2248 static void property_get_enum(Object *obj, Visitor *v, const char *name,
2249                               void *opaque, Error **errp)
2250 {
2251     EnumProperty *prop = opaque;
2252     int value;
2253     Error *err = NULL;
2254
2255     value = prop->get(obj, &err);
2256     if (err) {
2257         error_propagate(errp, err);
2258         return;
2259     }
2260
2261     visit_type_enum(v, name, &value, prop->lookup, errp);
2262 }
2263
2264 static void property_set_enum(Object *obj, Visitor *v, const char *name,
2265                               void *opaque, Error **errp)
2266 {
2267     EnumProperty *prop = opaque;
2268     int value;
2269
2270     if (!visit_type_enum(v, name, &value, prop->lookup, errp)) {
2271         return;
2272     }
2273     prop->set(obj, value, errp);
2274 }
2275
2276 static void property_release_enum(Object *obj, const char *name,
2277                                   void *opaque)
2278 {
2279     EnumProperty *prop = opaque;
2280     g_free(prop);
2281 }
2282
2283 ObjectProperty *
2284 object_property_add_enum(Object *obj, const char *name,
2285                          const char *typename,
2286                          const QEnumLookup *lookup,
2287                          int (*get)(Object *, Error **),
2288                          void (*set)(Object *, int, Error **))
2289 {
2290     EnumProperty *prop = g_malloc(sizeof(*prop));
2291
2292     prop->lookup = lookup;
2293     prop->get = get;
2294     prop->set = set;
2295
2296     return object_property_add(obj, name, typename,
2297                                get ? property_get_enum : NULL,
2298                                set ? property_set_enum : NULL,
2299                                property_release_enum,
2300                                prop);
2301 }
2302
2303 ObjectProperty *
2304 object_class_property_add_enum(ObjectClass *klass, const char *name,
2305                                     const char *typename,
2306                                     const QEnumLookup *lookup,
2307                                     int (*get)(Object *, Error **),
2308                                     void (*set)(Object *, int, Error **))
2309 {
2310     EnumProperty *prop = g_malloc(sizeof(*prop));
2311
2312     prop->lookup = lookup;
2313     prop->get = get;
2314     prop->set = set;
2315
2316     return object_class_property_add(klass, name, typename,
2317                                      get ? property_get_enum : NULL,
2318                                      set ? property_set_enum : NULL,
2319                                      NULL,
2320                                      prop);
2321 }
2322
2323 typedef struct TMProperty {
2324     void (*get)(Object *, struct tm *, Error **);
2325 } TMProperty;
2326
2327 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2328                             void *opaque, Error **errp)
2329 {
2330     TMProperty *prop = opaque;
2331     Error *err = NULL;
2332     struct tm value;
2333
2334     prop->get(obj, &value, &err);
2335     if (err) {
2336         error_propagate(errp, err);
2337         return;
2338     }
2339
2340     if (!visit_start_struct(v, name, NULL, 0, errp)) {
2341         return;
2342     }
2343     if (!visit_type_int32(v, "tm_year", &value.tm_year, errp)) {
2344         goto out_end;
2345     }
2346     if (!visit_type_int32(v, "tm_mon", &value.tm_mon, errp)) {
2347         goto out_end;
2348     }
2349     if (!visit_type_int32(v, "tm_mday", &value.tm_mday, errp)) {
2350         goto out_end;
2351     }
2352     if (!visit_type_int32(v, "tm_hour", &value.tm_hour, errp)) {
2353         goto out_end;
2354     }
2355     if (!visit_type_int32(v, "tm_min", &value.tm_min, errp)) {
2356         goto out_end;
2357     }
2358     if (!visit_type_int32(v, "tm_sec", &value.tm_sec, errp)) {
2359         goto out_end;
2360     }
2361     visit_check_struct(v, errp);
2362 out_end:
2363     visit_end_struct(v, NULL);
2364 }
2365
2366 static void property_release_tm(Object *obj, const char *name,
2367                                 void *opaque)
2368 {
2369     TMProperty *prop = opaque;
2370     g_free(prop);
2371 }
2372
2373 ObjectProperty *
2374 object_property_add_tm(Object *obj, const char *name,
2375                        void (*get)(Object *, struct tm *, Error **))
2376 {
2377     TMProperty *prop = g_malloc0(sizeof(*prop));
2378
2379     prop->get = get;
2380
2381     return object_property_add(obj, name, "struct tm",
2382                                get ? property_get_tm : NULL, NULL,
2383                                property_release_tm,
2384                                prop);
2385 }
2386
2387 ObjectProperty *
2388 object_class_property_add_tm(ObjectClass *klass, const char *name,
2389                              void (*get)(Object *, struct tm *, Error **))
2390 {
2391     TMProperty *prop = g_malloc0(sizeof(*prop));
2392
2393     prop->get = get;
2394
2395     return object_class_property_add(klass, name, "struct tm",
2396                                      get ? property_get_tm : NULL,
2397                                      NULL, NULL, prop);
2398 }
2399
2400 static char *object_get_type(Object *obj, Error **errp)
2401 {
2402     return g_strdup(object_get_typename(obj));
2403 }
2404
2405 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2406                                    void *opaque, Error **errp)
2407 {
2408     uint8_t value = *(uint8_t *)opaque;
2409     visit_type_uint8(v, name, &value, errp);
2410 }
2411
2412 static void property_set_uint8_ptr(Object *obj, Visitor *v, const char *name,
2413                                    void *opaque, Error **errp)
2414 {
2415     uint8_t *field = opaque;
2416     uint8_t value;
2417
2418     if (!visit_type_uint8(v, name, &value, errp)) {
2419         return;
2420     }
2421
2422     *field = value;
2423 }
2424
2425 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2426                                     void *opaque, Error **errp)
2427 {
2428     uint16_t value = *(uint16_t *)opaque;
2429     visit_type_uint16(v, name, &value, errp);
2430 }
2431
2432 static void property_set_uint16_ptr(Object *obj, Visitor *v, const char *name,
2433                                     void *opaque, Error **errp)
2434 {
2435     uint16_t *field = opaque;
2436     uint16_t value;
2437
2438     if (!visit_type_uint16(v, name, &value, errp)) {
2439         return;
2440     }
2441
2442     *field = value;
2443 }
2444
2445 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2446                                     void *opaque, Error **errp)
2447 {
2448     uint32_t value = *(uint32_t *)opaque;
2449     visit_type_uint32(v, name, &value, errp);
2450 }
2451
2452 static void property_set_uint32_ptr(Object *obj, Visitor *v, const char *name,
2453                                     void *opaque, Error **errp)
2454 {
2455     uint32_t *field = opaque;
2456     uint32_t value;
2457
2458     if (!visit_type_uint32(v, name, &value, errp)) {
2459         return;
2460     }
2461
2462     *field = value;
2463 }
2464
2465 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2466                                     void *opaque, Error **errp)
2467 {
2468     uint64_t value = *(uint64_t *)opaque;
2469     visit_type_uint64(v, name, &value, errp);
2470 }
2471
2472 static void property_set_uint64_ptr(Object *obj, Visitor *v, const char *name,
2473                                     void *opaque, Error **errp)
2474 {
2475     uint64_t *field = opaque;
2476     uint64_t value;
2477
2478     if (!visit_type_uint64(v, name, &value, errp)) {
2479         return;
2480     }
2481
2482     *field = value;
2483 }
2484
2485 ObjectProperty *
2486 object_property_add_uint8_ptr(Object *obj, const char *name,
2487                               const uint8_t *v,
2488                               ObjectPropertyFlags flags)
2489 {
2490     ObjectPropertyAccessor *getter = NULL;
2491     ObjectPropertyAccessor *setter = NULL;
2492
2493     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2494         getter = property_get_uint8_ptr;
2495     }
2496
2497     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2498         setter = property_set_uint8_ptr;
2499     }
2500
2501     return object_property_add(obj, name, "uint8",
2502                                getter, setter, NULL, (void *)v);
2503 }
2504
2505 ObjectProperty *
2506 object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2507                                     const uint8_t *v,
2508                                     ObjectPropertyFlags flags)
2509 {
2510     ObjectPropertyAccessor *getter = NULL;
2511     ObjectPropertyAccessor *setter = NULL;
2512
2513     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2514         getter = property_get_uint8_ptr;
2515     }
2516
2517     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2518         setter = property_set_uint8_ptr;
2519     }
2520
2521     return object_class_property_add(klass, name, "uint8",
2522                                      getter, setter, NULL, (void *)v);
2523 }
2524
2525 ObjectProperty *
2526 object_property_add_uint16_ptr(Object *obj, const char *name,
2527                                const uint16_t *v,
2528                                ObjectPropertyFlags flags)
2529 {
2530     ObjectPropertyAccessor *getter = NULL;
2531     ObjectPropertyAccessor *setter = NULL;
2532
2533     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2534         getter = property_get_uint16_ptr;
2535     }
2536
2537     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2538         setter = property_set_uint16_ptr;
2539     }
2540
2541     return object_property_add(obj, name, "uint16",
2542                                getter, setter, NULL, (void *)v);
2543 }
2544
2545 ObjectProperty *
2546 object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2547                                      const uint16_t *v,
2548                                      ObjectPropertyFlags flags)
2549 {
2550     ObjectPropertyAccessor *getter = NULL;
2551     ObjectPropertyAccessor *setter = NULL;
2552
2553     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2554         getter = property_get_uint16_ptr;
2555     }
2556
2557     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2558         setter = property_set_uint16_ptr;
2559     }
2560
2561     return object_class_property_add(klass, name, "uint16",
2562                                      getter, setter, NULL, (void *)v);
2563 }
2564
2565 ObjectProperty *
2566 object_property_add_uint32_ptr(Object *obj, const char *name,
2567                                const uint32_t *v,
2568                                ObjectPropertyFlags flags)
2569 {
2570     ObjectPropertyAccessor *getter = NULL;
2571     ObjectPropertyAccessor *setter = NULL;
2572
2573     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2574         getter = property_get_uint32_ptr;
2575     }
2576
2577     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2578         setter = property_set_uint32_ptr;
2579     }
2580
2581     return object_property_add(obj, name, "uint32",
2582                                getter, setter, NULL, (void *)v);
2583 }
2584
2585 ObjectProperty *
2586 object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2587                                      const uint32_t *v,
2588                                      ObjectPropertyFlags flags)
2589 {
2590     ObjectPropertyAccessor *getter = NULL;
2591     ObjectPropertyAccessor *setter = NULL;
2592
2593     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2594         getter = property_get_uint32_ptr;
2595     }
2596
2597     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2598         setter = property_set_uint32_ptr;
2599     }
2600
2601     return object_class_property_add(klass, name, "uint32",
2602                                      getter, setter, NULL, (void *)v);
2603 }
2604
2605 ObjectProperty *
2606 object_property_add_uint64_ptr(Object *obj, const char *name,
2607                                const uint64_t *v,
2608                                ObjectPropertyFlags flags)
2609 {
2610     ObjectPropertyAccessor *getter = NULL;
2611     ObjectPropertyAccessor *setter = NULL;
2612
2613     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2614         getter = property_get_uint64_ptr;
2615     }
2616
2617     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2618         setter = property_set_uint64_ptr;
2619     }
2620
2621     return object_property_add(obj, name, "uint64",
2622                                getter, setter, NULL, (void *)v);
2623 }
2624
2625 ObjectProperty *
2626 object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2627                                      const uint64_t *v,
2628                                      ObjectPropertyFlags flags)
2629 {
2630     ObjectPropertyAccessor *getter = NULL;
2631     ObjectPropertyAccessor *setter = NULL;
2632
2633     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2634         getter = property_get_uint64_ptr;
2635     }
2636
2637     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2638         setter = property_set_uint64_ptr;
2639     }
2640
2641     return object_class_property_add(klass, name, "uint64",
2642                                      getter, setter, NULL, (void *)v);
2643 }
2644
2645 typedef struct {
2646     Object *target_obj;
2647     char *target_name;
2648 } AliasProperty;
2649
2650 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2651                                void *opaque, Error **errp)
2652 {
2653     AliasProperty *prop = opaque;
2654
2655     object_property_get(prop->target_obj, prop->target_name, v, errp);
2656 }
2657
2658 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2659                                void *opaque, Error **errp)
2660 {
2661     AliasProperty *prop = opaque;
2662
2663     object_property_set(prop->target_obj, prop->target_name, v, errp);
2664 }
2665
2666 static Object *property_resolve_alias(Object *obj, void *opaque,
2667                                       const char *part)
2668 {
2669     AliasProperty *prop = opaque;
2670
2671     return object_resolve_path_component(prop->target_obj, prop->target_name);
2672 }
2673
2674 static void property_release_alias(Object *obj, const char *name, void *opaque)
2675 {
2676     AliasProperty *prop = opaque;
2677
2678     g_free(prop->target_name);
2679     g_free(prop);
2680 }
2681
2682 ObjectProperty *
2683 object_property_add_alias(Object *obj, const char *name,
2684                           Object *target_obj, const char *target_name)
2685 {
2686     AliasProperty *prop;
2687     ObjectProperty *op;
2688     ObjectProperty *target_prop;
2689     g_autofree char *prop_type = NULL;
2690
2691     target_prop = object_property_find(target_obj, target_name,
2692                                        &error_abort);
2693
2694     if (object_property_is_child(target_prop)) {
2695         prop_type = g_strdup_printf("link%s",
2696                                     target_prop->type + strlen("child"));
2697     } else {
2698         prop_type = g_strdup(target_prop->type);
2699     }
2700
2701     prop = g_malloc(sizeof(*prop));
2702     prop->target_obj = target_obj;
2703     prop->target_name = g_strdup(target_name);
2704
2705     op = object_property_add(obj, name, prop_type,
2706                              property_get_alias,
2707                              property_set_alias,
2708                              property_release_alias,
2709                              prop);
2710     op->resolve = property_resolve_alias;
2711     if (target_prop->defval) {
2712         op->defval = qobject_ref(target_prop->defval);
2713     }
2714
2715     object_property_set_description(obj, op->name,
2716                                     target_prop->description);
2717     return op;
2718 }
2719
2720 void object_property_set_description(Object *obj, const char *name,
2721                                      const char *description)
2722 {
2723     ObjectProperty *op;
2724
2725     op = object_property_find(obj, name, &error_abort);
2726     g_free(op->description);
2727     op->description = g_strdup(description);
2728 }
2729
2730 void object_class_property_set_description(ObjectClass *klass,
2731                                            const char *name,
2732                                            const char *description)
2733 {
2734     ObjectProperty *op;
2735
2736     op = g_hash_table_lookup(klass->properties, name);
2737     g_free(op->description);
2738     op->description = g_strdup(description);
2739 }
2740
2741 static void object_class_init(ObjectClass *klass, void *data)
2742 {
2743     object_class_property_add_str(klass, "type", object_get_type,
2744                                   NULL);
2745 }
2746
2747 static void register_types(void)
2748 {
2749     static TypeInfo interface_info = {
2750         .name = TYPE_INTERFACE,
2751         .class_size = sizeof(InterfaceClass),
2752         .abstract = true,
2753     };
2754
2755     static TypeInfo object_info = {
2756         .name = TYPE_OBJECT,
2757         .instance_size = sizeof(Object),
2758         .class_init = object_class_init,
2759         .abstract = true,
2760     };
2761
2762     type_interface = type_register_internal(&interface_info);
2763     type_register_internal(&object_info);
2764 }
2765
2766 type_init(register_types)