qom/object.c

   1 /*
   2  * QEMU Object Model
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "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 void object_apply_global_props(Object *obj, const GPtrArray *props, Error **errp)
 389 {
 390     int i;
 391
 392     if (!props) {
 393         return;
 394     }
 395
 396     for (i = 0; i < props->len; i++) {
 397         GlobalProperty *p = g_ptr_array_index(props, i);
 398         Error *err = NULL;
 399
 400         if (object_dynamic_cast(obj, p->driver) == NULL) {
 401             continue;
 402         }
 403         if (p->optional && !object_property_find(obj, p->property, NULL)) {
 404             continue;
 405         }
 406         p->used = true;
 407         object_property_parse(obj, p->value, p->property, &err);
 408         if (err != NULL) {
 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;
 419             } else {
 420                 warn_report_err(err);
 421             }
 422         }
 423     }
 424 }
 425
 426 /*
 427  * Global property defaults
 428  * Slot 0: accelerator's global property defaults
 429  * Slot 1: machine's global property defaults
 430  * Slot 2: global properties from legacy command line option
 431  * Each is a GPtrArray of of GlobalProperty.
 432  * Applied in order, later entries override earlier ones.
 433  */
 434 static GPtrArray *object_compat_props[3];
 435
 436 /*
 437  * Retrieve @GPtrArray for global property defined with options
 438  * other than "-global".  These are generally used for syntactic
 439  * sugar and legacy command line options.
 440  */
 441 void object_register_sugar_prop(const char *driver, const char *prop, const char *value)
 442 {
 443     GlobalProperty *g;
 444     if (!object_compat_props[2]) {
 445         object_compat_props[2] = g_ptr_array_new();
 446     }
 447     g = g_new0(GlobalProperty, 1);
 448     g->driver = g_strdup(driver);
 449     g->property = g_strdup(prop);
 450     g->value = g_strdup(value);
 451     g_ptr_array_add(object_compat_props[2], g);
 452 }
 453
 454 /*
 455  * Set machine's global property defaults to @compat_props.
 456  * May be called at most once.
 457  */
 458 void object_set_machine_compat_props(GPtrArray *compat_props)
 459 {
 460     assert(!object_compat_props[1]);
 461     object_compat_props[1] = compat_props;
 462 }
 463
 464 /*
 465  * Set accelerator's global property defaults to @compat_props.
 466  * May be called at most once.
 467  */
 468 void object_set_accelerator_compat_props(GPtrArray *compat_props)
 469 {
 470     assert(!object_compat_props[0]);
 471     object_compat_props[0] = compat_props;
 472 }
 473
 474 void object_apply_compat_props(Object *obj)
 475 {
 476     int i;
 477
 478     for (i = 0; i < ARRAY_SIZE(object_compat_props); i++) {
 479         object_apply_global_props(obj, object_compat_props[i],
 480                                   i == 2 ? &error_fatal : &error_abort);
 481     }
 482 }
 483
 484 static void object_class_property_init_all(Object *obj)
 485 {
 486     ObjectPropertyIterator iter;
 487     ObjectProperty *prop;
 488
 489     object_class_property_iter_init(&iter, object_get_class(obj));
 490     while ((prop = object_property_iter_next(&iter))) {
 491         if (prop->init) {
 492             prop->init(obj, prop);
 493         }
 494     }
 495 }
 496
 497 static void object_initialize_with_type(Object *obj, size_t size, TypeImpl *type)
 498 {
 499     type_initialize(type);
 500
 501     g_assert(type->instance_size >= sizeof(Object));
 502     g_assert(type->abstract == false);
 503     g_assert(size >= type->instance_size);
 504
 505     memset(obj, 0, type->instance_size);
 506     obj->class = type->class;
 507     object_ref(obj);
 508     object_class_property_init_all(obj);
 509     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 510                                             NULL, object_property_free);
 511     object_init_with_type(obj, type);
 512     object_post_init_with_type(obj, type);
 513 }
 514
 515 void object_initialize(void *data, size_t size, const char *typename)
 516 {
 517     TypeImpl *type = type_get_by_name(typename);
 518
 519     if (!type) {
 520         error_report("missing object type '%s'", typename);
 521         abort();
 522     }
 523
 524     object_initialize_with_type(data, size, type);
 525 }
 526
 527 void object_initialize_child_with_props(Object *parentobj,
 528                              const char *propname,
 529                              void *childobj, size_t size, const char *type,
 530                              Error **errp, ...)
 531 {
 532     va_list vargs;
 533
 534     va_start(vargs, errp);
 535     object_initialize_child_with_propsv(parentobj, propname,
 536                                         childobj, size, type, errp, vargs);
 537     va_end(vargs);
 538 }
 539
 540 void object_initialize_child_with_propsv(Object *parentobj,
 541                               const char *propname,
 542                               void *childobj, size_t size, const char *type,
 543                               Error **errp, va_list vargs)
 544 {
 545     Error *local_err = NULL;
 546     Object *obj;
 547     UserCreatable *uc;
 548
 549     object_initialize(childobj, size, type);
 550     obj = OBJECT(childobj);
 551
 552     object_set_propv(obj, &local_err, vargs);
 553     if (local_err) {
 554         goto out;
 555     }
 556
 557     object_property_add_child(parentobj, propname, obj);
 558
 559     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 560     if (uc) {
 561         user_creatable_complete(uc, &local_err);
 562         if (local_err) {
 563             object_unparent(obj);
 564             goto out;
 565         }
 566     }
 567
 568 out:
 569     /*
 570      * We want @obj's reference to be 1 on success, 0 on failure.
 571      * On success, it's 2: one taken by object_initialize(), and one
 572      * by object_property_add_child().
 573      * On failure in object_initialize() or earlier, it's 1.
 574      * On failure afterwards, it's also 1: object_unparent() releases
 575      * the reference taken by object_property_add_child().
 576      */
 577     object_unref(obj);
 578
 579     error_propagate(errp, local_err);
 580 }
 581
 582 void object_initialize_child_internal(Object *parent,
 583                                       const char *propname,
 584                                       void *child, size_t size,
 585                                       const char *type)
 586 {
 587     object_initialize_child_with_props(parent, propname, child, size, type,
 588                                        &error_abort, NULL);
 589 }
 590
 591 static inline bool object_property_is_child(ObjectProperty *prop)
 592 {
 593     return strstart(prop->type, "child<", NULL);
 594 }
 595
 596 static void object_property_del_all(Object *obj)
 597 {
 598     g_autoptr(GHashTable) done = g_hash_table_new(NULL, NULL);
 599     ObjectProperty *prop;
 600     ObjectPropertyIterator iter;
 601     bool released;
 602
 603     do {
 604         released = false;
 605         object_property_iter_init(&iter, obj);
 606         while ((prop = object_property_iter_next(&iter)) != NULL) {
 607             if (g_hash_table_add(done, prop)) {
 608                 if (prop->release) {
 609                     prop->release(obj, prop->name, prop->opaque);
 610                     released = true;
 611                     break;
 612                 }
 613             }
 614         }
 615     } while (released);
 616
 617     g_hash_table_unref(obj->properties);
 618 }
 619
 620 static void object_property_del_child(Object *obj, Object *child)
 621 {
 622     ObjectProperty *prop;
 623     GHashTableIter iter;
 624     gpointer key, value;
 625
 626     g_hash_table_iter_init(&iter, obj->properties);
 627     while (g_hash_table_iter_next(&iter, &key, &value)) {
 628         prop = value;
 629         if (object_property_is_child(prop) && prop->opaque == child) {
 630             if (prop->release) {
 631                 prop->release(obj, prop->name, prop->opaque);
 632                 prop->release = NULL;
 633             }
 634             break;
 635         }
 636     }
 637     g_hash_table_iter_init(&iter, obj->properties);
 638     while (g_hash_table_iter_next(&iter, &key, &value)) {
 639         prop = value;
 640         if (object_property_is_child(prop) && prop->opaque == child) {
 641             g_hash_table_iter_remove(&iter);
 642             break;
 643         }
 644     }
 645 }
 646
 647 void object_unparent(Object *obj)
 648 {
 649     if (obj->parent) {
 650         object_property_del_child(obj->parent, obj);
 651     }
 652 }
 653
 654 static void object_deinit(Object *obj, TypeImpl *type)
 655 {
 656     if (type->instance_finalize) {
 657         type->instance_finalize(obj);
 658     }
 659
 660     if (type_has_parent(type)) {
 661         object_deinit(obj, type_get_parent(type));
 662     }
 663 }
 664
 665 static void object_finalize(void *data)
 666 {
 667     Object *obj = data;
 668     TypeImpl *ti = obj->class->type;
 669
 670     object_property_del_all(obj);
 671     object_deinit(obj, ti);
 672
 673     g_assert(obj->ref == 0);
 674     if (obj->free) {
 675         obj->free(obj);
 676     }
 677 }
 678
 679 static Object *object_new_with_type(Type type)
 680 {
 681     Object *obj;
 682
 683     g_assert(type != NULL);
 684     type_initialize(type);
 685
 686     obj = g_malloc(type->instance_size);
 687     object_initialize_with_type(obj, type->instance_size, type);
 688     obj->free = g_free;
 689
 690     return obj;
 691 }
 692
 693 Object *object_new_with_class(ObjectClass *klass)
 694 {
 695     return object_new_with_type(klass->type);
 696 }
 697
 698 Object *object_new(const char *typename)
 699 {
 700     TypeImpl *ti = type_get_by_name(typename);
 701
 702     return object_new_with_type(ti);
 703 }
 704
 705
 706 Object *object_new_with_props(const char *typename,
 707                               Object *parent,
 708                               const char *id,
 709                               Error **errp,
 710                               ...)
 711 {
 712     va_list vargs;
 713     Object *obj;
 714
 715     va_start(vargs, errp);
 716     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 717     va_end(vargs);
 718
 719     return obj;
 720 }
 721
 722
 723 Object *object_new_with_propv(const char *typename,
 724                               Object *parent,
 725                               const char *id,
 726                               Error **errp,
 727                               va_list vargs)
 728 {
 729     Object *obj;
 730     ObjectClass *klass;
 731     Error *local_err = NULL;
 732     UserCreatable *uc;
 733
 734     klass = object_class_by_name(typename);
 735     if (!klass) {
 736         error_setg(errp, "invalid object type: %s", typename);
 737         return NULL;
 738     }
 739
 740     if (object_class_is_abstract(klass)) {
 741         error_setg(errp, "object type '%s' is abstract", typename);
 742         return NULL;
 743     }
 744     obj = object_new_with_type(klass->type);
 745
 746     if (object_set_propv(obj, &local_err, vargs) < 0) {
 747         goto error;
 748     }
 749
 750     if (id != NULL) {
 751         object_property_add_child(parent, id, obj);
 752     }
 753
 754     uc = (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
 755     if (uc) {
 756         user_creatable_complete(uc, &local_err);
 757         if (local_err) {
 758             if (id != NULL) {
 759                 object_unparent(obj);
 760             }
 761             goto error;
 762         }
 763     }
 764
 765     object_unref(obj);
 766     return obj;
 767
 768  error:
 769     error_propagate(errp, local_err);
 770     object_unref(obj);
 771     return NULL;
 772 }
 773
 774
 775 int object_set_props(Object *obj,
 776                      Error **errp,
 777                      ...)
 778 {
 779     va_list vargs;
 780     int ret;
 781
 782     va_start(vargs, errp);
 783     ret = object_set_propv(obj, errp, vargs);
 784     va_end(vargs);
 785
 786     return ret;
 787 }
 788
 789
 790 int object_set_propv(Object *obj,
 791                      Error **errp,
 792                      va_list vargs)
 793 {
 794     const char *propname;
 795     Error *local_err = NULL;
 796
 797     propname = va_arg(vargs, char *);
 798     while (propname != NULL) {
 799         const char *value = va_arg(vargs, char *);
 800
 801         g_assert(value != NULL);
 802         object_property_parse(obj, value, propname, &local_err);
 803         if (local_err) {
 804             error_propagate(errp, local_err);
 805             return -1;
 806         }
 807         propname = va_arg(vargs, char *);
 808     }
 809
 810     return 0;
 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(Object *obj)
1128 {
1129     if (!obj) {
1130         return NULL;
1131     }
1132     atomic_inc(&obj->ref);
1133     return obj;
1134 }
1135
1136 void object_unref(Object *obj)
1137 {
1138     if (!obj) {
1139         return;
1140     }
1141     g_assert(obj->ref > 0);
1142
1143     /* parent always holds a reference to its children */
1144     if (atomic_fetch_dec(&obj->ref) == 1) {
1145         object_finalize(obj);
1146     }
1147 }
1148
1149 static ObjectProperty *
1150 object_property_try_add(Object *obj, const char *name, const char *type,
1151                         ObjectPropertyAccessor *get,
1152                         ObjectPropertyAccessor *set,
1153                         ObjectPropertyRelease *release,
1154                         void *opaque, Error **errp)
1155 {
1156     ObjectProperty *prop;
1157     size_t name_len = strlen(name);
1158
1159     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
1160         int i;
1161         ObjectProperty *ret;
1162         char *name_no_array = g_strdup(name);
1163
1164         name_no_array[name_len - 3] = '\0';
1165         for (i = 0; ; ++i) {
1166             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
1167
1168             ret = object_property_try_add(obj, full_name, type, get, set,
1169                                           release, opaque, NULL);
1170             g_free(full_name);
1171             if (ret) {
1172                 break;
1173             }
1174         }
1175         g_free(name_no_array);
1176         return ret;
1177     }
1178
1179     if (object_property_find(obj, name, NULL) != NULL) {
1180         error_setg(errp, "attempt to add duplicate property '%s' to object (type '%s')",
1181                    name, object_get_typename(obj));
1182         return NULL;
1183     }
1184
1185     prop = g_malloc0(sizeof(*prop));
1186
1187     prop->name = g_strdup(name);
1188     prop->type = g_strdup(type);
1189
1190     prop->get = get;
1191     prop->set = set;
1192     prop->release = release;
1193     prop->opaque = opaque;
1194
1195     g_hash_table_insert(obj->properties, prop->name, prop);
1196     return prop;
1197 }
1198
1199 ObjectProperty *
1200 object_property_add(Object *obj, const char *name, const char *type,
1201                     ObjectPropertyAccessor *get,
1202                     ObjectPropertyAccessor *set,
1203                     ObjectPropertyRelease *release,
1204                     void *opaque)
1205 {
1206     return object_property_try_add(obj, name, type, get, set, release,
1207                                    opaque, &error_abort);
1208 }
1209
1210 ObjectProperty *
1211 object_class_property_add(ObjectClass *klass,
1212                           const char *name,
1213                           const char *type,
1214                           ObjectPropertyAccessor *get,
1215                           ObjectPropertyAccessor *set,
1216                           ObjectPropertyRelease *release,
1217                           void *opaque)
1218 {
1219     ObjectProperty *prop;
1220
1221     assert(!object_class_property_find(klass, name, NULL));
1222
1223     prop = g_malloc0(sizeof(*prop));
1224
1225     prop->name = g_strdup(name);
1226     prop->type = g_strdup(type);
1227
1228     prop->get = get;
1229     prop->set = set;
1230     prop->release = release;
1231     prop->opaque = opaque;
1232
1233     g_hash_table_insert(klass->properties, prop->name, prop);
1234
1235     return prop;
1236 }
1237
1238 ObjectProperty *object_property_find(Object *obj, const char *name,
1239                                      Error **errp)
1240 {
1241     ObjectProperty *prop;
1242     ObjectClass *klass = object_get_class(obj);
1243
1244     prop = object_class_property_find(klass, name, NULL);
1245     if (prop) {
1246         return prop;
1247     }
1248
1249     prop = g_hash_table_lookup(obj->properties, name);
1250     if (prop) {
1251         return prop;
1252     }
1253
1254     error_setg(errp, "Property '.%s' not found", name);
1255     return NULL;
1256 }
1257
1258 void object_property_iter_init(ObjectPropertyIterator *iter,
1259                                Object *obj)
1260 {
1261     g_hash_table_iter_init(&iter->iter, obj->properties);
1262     iter->nextclass = object_get_class(obj);
1263 }
1264
1265 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1266 {
1267     gpointer key, val;
1268     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1269         if (!iter->nextclass) {
1270             return NULL;
1271         }
1272         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1273         iter->nextclass = object_class_get_parent(iter->nextclass);
1274     }
1275     return val;
1276 }
1277
1278 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1279                                      ObjectClass *klass)
1280 {
1281     g_hash_table_iter_init(&iter->iter, klass->properties);
1282     iter->nextclass = object_class_get_parent(klass);
1283 }
1284
1285 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1286                                            Error **errp)
1287 {
1288     ObjectProperty *prop;
1289     ObjectClass *parent_klass;
1290
1291     parent_klass = object_class_get_parent(klass);
1292     if (parent_klass) {
1293         prop = object_class_property_find(parent_klass, name, NULL);
1294         if (prop) {
1295             return prop;
1296         }
1297     }
1298
1299     prop = g_hash_table_lookup(klass->properties, name);
1300     if (!prop) {
1301         error_setg(errp, "Property '.%s' not found", name);
1302     }
1303     return prop;
1304 }
1305
1306 void object_property_del(Object *obj, const char *name)
1307 {
1308     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1309
1310     if (prop->release) {
1311         prop->release(obj, name, prop->opaque);
1312     }
1313     g_hash_table_remove(obj->properties, name);
1314 }
1315
1316 void object_property_get(Object *obj, Visitor *v, const char *name,
1317                          Error **errp)
1318 {
1319     ObjectProperty *prop = object_property_find(obj, name, errp);
1320     if (prop == NULL) {
1321         return;
1322     }
1323
1324     if (!prop->get) {
1325         error_setg(errp, QERR_PERMISSION_DENIED);
1326     } else {
1327         prop->get(obj, v, name, prop->opaque, errp);
1328     }
1329 }
1330
1331 void object_property_set(Object *obj, Visitor *v, const char *name,
1332                          Error **errp)
1333 {
1334     ObjectProperty *prop = object_property_find(obj, name, errp);
1335     if (prop == NULL) {
1336         return;
1337     }
1338
1339     if (!prop->set) {
1340         error_setg(errp, QERR_PERMISSION_DENIED);
1341     } else {
1342         prop->set(obj, v, name, prop->opaque, errp);
1343     }
1344 }
1345
1346 void object_property_set_str(Object *obj, const char *value,
1347                              const char *name, Error **errp)
1348 {
1349     QString *qstr = qstring_from_str(value);
1350     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1351
1352     qobject_unref(qstr);
1353 }
1354
1355 char *object_property_get_str(Object *obj, const char *name,
1356                               Error **errp)
1357 {
1358     QObject *ret = object_property_get_qobject(obj, name, errp);
1359     char *retval;
1360
1361     if (!ret) {
1362         return NULL;
1363     }
1364
1365     retval = g_strdup(qobject_get_try_str(ret));
1366     if (!retval) {
1367         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1368     }
1369
1370     qobject_unref(ret);
1371     return retval;
1372 }
1373
1374 void object_property_set_link(Object *obj, Object *value,
1375                               const char *name, Error **errp)
1376 {
1377     if (value) {
1378         char *path = object_get_canonical_path(value);
1379         object_property_set_str(obj, path, name, errp);
1380         g_free(path);
1381     } else {
1382         object_property_set_str(obj, "", name, errp);
1383     }
1384 }
1385
1386 Object *object_property_get_link(Object *obj, const char *name,
1387                                  Error **errp)
1388 {
1389     char *str = object_property_get_str(obj, name, errp);
1390     Object *target = NULL;
1391
1392     if (str && *str) {
1393         target = object_resolve_path(str, NULL);
1394         if (!target) {
1395             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1396                       "Device '%s' not found", str);
1397         }
1398     }
1399
1400     g_free(str);
1401     return target;
1402 }
1403
1404 void object_property_set_bool(Object *obj, bool value,
1405                               const char *name, Error **errp)
1406 {
1407     QBool *qbool = qbool_from_bool(value);
1408     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1409
1410     qobject_unref(qbool);
1411 }
1412
1413 bool object_property_get_bool(Object *obj, const char *name,
1414                               Error **errp)
1415 {
1416     QObject *ret = object_property_get_qobject(obj, name, errp);
1417     QBool *qbool;
1418     bool retval;
1419
1420     if (!ret) {
1421         return false;
1422     }
1423     qbool = qobject_to(QBool, ret);
1424     if (!qbool) {
1425         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1426         retval = false;
1427     } else {
1428         retval = qbool_get_bool(qbool);
1429     }
1430
1431     qobject_unref(ret);
1432     return retval;
1433 }
1434
1435 void object_property_set_int(Object *obj, int64_t value,
1436                              const char *name, Error **errp)
1437 {
1438     QNum *qnum = qnum_from_int(value);
1439     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1440
1441     qobject_unref(qnum);
1442 }
1443
1444 int64_t object_property_get_int(Object *obj, const char *name,
1445                                 Error **errp)
1446 {
1447     QObject *ret = object_property_get_qobject(obj, name, errp);
1448     QNum *qnum;
1449     int64_t retval;
1450
1451     if (!ret) {
1452         return -1;
1453     }
1454
1455     qnum = qobject_to(QNum, ret);
1456     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1457         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1458         retval = -1;
1459     }
1460
1461     qobject_unref(ret);
1462     return retval;
1463 }
1464
1465 static void object_property_init_defval(Object *obj, ObjectProperty *prop)
1466 {
1467     Visitor *v = qobject_input_visitor_new(prop->defval);
1468
1469     assert(prop->set != NULL);
1470     prop->set(obj, v, prop->name, prop->opaque, &error_abort);
1471
1472     visit_free(v);
1473 }
1474
1475 static void object_property_set_default(ObjectProperty *prop, QObject *defval)
1476 {
1477     assert(!prop->defval);
1478     assert(!prop->init);
1479
1480     prop->defval = defval;
1481     prop->init = object_property_init_defval;
1482 }
1483
1484 void object_property_set_default_bool(ObjectProperty *prop, bool value)
1485 {
1486     object_property_set_default(prop, QOBJECT(qbool_from_bool(value)));
1487 }
1488
1489 void object_property_set_default_str(ObjectProperty *prop, const char *value)
1490 {
1491     object_property_set_default(prop, QOBJECT(qstring_from_str(value)));
1492 }
1493
1494 void object_property_set_default_int(ObjectProperty *prop, int64_t value)
1495 {
1496     object_property_set_default(prop, QOBJECT(qnum_from_int(value)));
1497 }
1498
1499 void object_property_set_default_uint(ObjectProperty *prop, uint64_t value)
1500 {
1501     object_property_set_default(prop, QOBJECT(qnum_from_uint(value)));
1502 }
1503
1504 void object_property_set_uint(Object *obj, uint64_t value,
1505                               const char *name, Error **errp)
1506 {
1507     QNum *qnum = qnum_from_uint(value);
1508
1509     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1510     qobject_unref(qnum);
1511 }
1512
1513 uint64_t object_property_get_uint(Object *obj, const char *name,
1514                                   Error **errp)
1515 {
1516     QObject *ret = object_property_get_qobject(obj, name, errp);
1517     QNum *qnum;
1518     uint64_t retval;
1519
1520     if (!ret) {
1521         return 0;
1522     }
1523     qnum = qobject_to(QNum, ret);
1524     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1525         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1526         retval = 0;
1527     }
1528
1529     qobject_unref(ret);
1530     return retval;
1531 }
1532
1533 typedef struct EnumProperty {
1534     const QEnumLookup *lookup;
1535     int (*get)(Object *, Error **);
1536     void (*set)(Object *, int, Error **);
1537 } EnumProperty;
1538
1539 int object_property_get_enum(Object *obj, const char *name,
1540                              const char *typename, Error **errp)
1541 {
1542     char *str;
1543     int ret;
1544     ObjectProperty *prop = object_property_find(obj, name, errp);
1545     EnumProperty *enumprop;
1546
1547     if (prop == NULL) {
1548         return 0;
1549     }
1550
1551     if (!g_str_equal(prop->type, typename)) {
1552         error_setg(errp, "Property %s on %s is not '%s' enum type",
1553                    name, object_class_get_name(
1554                        object_get_class(obj)), typename);
1555         return 0;
1556     }
1557
1558     enumprop = prop->opaque;
1559
1560     str = object_property_get_str(obj, name, errp);
1561     if (!str) {
1562         return 0;
1563     }
1564
1565     ret = qapi_enum_parse(enumprop->lookup, str, -1, errp);
1566     g_free(str);
1567
1568     return ret;
1569 }
1570
1571 void object_property_parse(Object *obj, const char *string,
1572                            const char *name, Error **errp)
1573 {
1574     Visitor *v = string_input_visitor_new(string);
1575     object_property_set(obj, v, name, errp);
1576     visit_free(v);
1577 }
1578
1579 char *object_property_print(Object *obj, const char *name, bool human,
1580                             Error **errp)
1581 {
1582     Visitor *v;
1583     char *string = NULL;
1584     Error *local_err = NULL;
1585
1586     v = string_output_visitor_new(human, &string);
1587     object_property_get(obj, v, name, &local_err);
1588     if (local_err) {
1589         error_propagate(errp, local_err);
1590         goto out;
1591     }
1592
1593     visit_complete(v, &string);
1594
1595 out:
1596     visit_free(v);
1597     return string;
1598 }
1599
1600 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1601 {
1602     ObjectProperty *prop = object_property_find(obj, name, errp);
1603     if (prop == NULL) {
1604         return NULL;
1605     }
1606
1607     return prop->type;
1608 }
1609
1610 Object *object_get_root(void)
1611 {
1612     static Object *root;
1613
1614     if (!root) {
1615         root = object_new("container");
1616     }
1617
1618     return root;
1619 }
1620
1621 Object *object_get_objects_root(void)
1622 {
1623     return container_get(object_get_root(), "/objects");
1624 }
1625
1626 Object *object_get_internal_root(void)
1627 {
1628     static Object *internal_root;
1629
1630     if (!internal_root) {
1631         internal_root = object_new("container");
1632     }
1633
1634     return internal_root;
1635 }
1636
1637 static void object_get_child_property(Object *obj, Visitor *v,
1638                                       const char *name, void *opaque,
1639                                       Error **errp)
1640 {
1641     Object *child = opaque;
1642     char *path;
1643
1644     path = object_get_canonical_path(child);
1645     visit_type_str(v, name, &path, errp);
1646     g_free(path);
1647 }
1648
1649 static Object *object_resolve_child_property(Object *parent, void *opaque,
1650                                              const char *part)
1651 {
1652     return opaque;
1653 }
1654
1655 static void object_finalize_child_property(Object *obj, const char *name,
1656                                            void *opaque)
1657 {
1658     Object *child = opaque;
1659
1660     if (child->class->unparent) {
1661         (child->class->unparent)(child);
1662     }
1663     child->parent = NULL;
1664     object_unref(child);
1665 }
1666
1667 ObjectProperty *
1668 object_property_add_child(Object *obj, const char *name,
1669                           Object *child)
1670 {
1671     g_autofree char *type = NULL;
1672     ObjectProperty *op;
1673
1674     assert(!child->parent);
1675
1676     type = g_strdup_printf("child<%s>", object_get_typename(child));
1677
1678     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1679                              object_finalize_child_property, child);
1680     op->resolve = object_resolve_child_property;
1681     object_ref(child);
1682     child->parent = obj;
1683     return op;
1684 }
1685
1686 void object_property_allow_set_link(const Object *obj, const char *name,
1687                                     Object *val, Error **errp)
1688 {
1689     /* Allow the link to be set, always */
1690 }
1691
1692 typedef struct {
1693     union {
1694         Object **targetp;
1695         Object *target; /* if OBJ_PROP_LINK_DIRECT, when holding the pointer  */
1696         ptrdiff_t offset; /* if OBJ_PROP_LINK_CLASS */
1697     };
1698     void (*check)(const Object *, const char *, Object *, Error **);
1699     ObjectPropertyLinkFlags flags;
1700 } LinkProperty;
1701
1702 static Object **
1703 object_link_get_targetp(Object *obj, LinkProperty *lprop)
1704 {
1705     if (lprop->flags & OBJ_PROP_LINK_DIRECT) {
1706         return &lprop->target;
1707     } else if (lprop->flags & OBJ_PROP_LINK_CLASS) {
1708         return (void *)obj + lprop->offset;
1709     } else {
1710         return lprop->targetp;
1711     }
1712 }
1713
1714 static void object_get_link_property(Object *obj, Visitor *v,
1715                                      const char *name, void *opaque,
1716                                      Error **errp)
1717 {
1718     LinkProperty *lprop = opaque;
1719     Object **targetp = object_link_get_targetp(obj, lprop);
1720     char *path;
1721
1722     if (*targetp) {
1723         path = object_get_canonical_path(*targetp);
1724         visit_type_str(v, name, &path, errp);
1725         g_free(path);
1726     } else {
1727         path = (char *)"";
1728         visit_type_str(v, name, &path, errp);
1729     }
1730 }
1731
1732 /*
1733  * object_resolve_link:
1734  *
1735  * Lookup an object and ensure its type matches the link property type.  This
1736  * is similar to object_resolve_path() except type verification against the
1737  * link property is performed.
1738  *
1739  * Returns: The matched object or NULL on path lookup failures.
1740  */
1741 static Object *object_resolve_link(Object *obj, const char *name,
1742                                    const char *path, Error **errp)
1743 {
1744     const char *type;
1745     char *target_type;
1746     bool ambiguous = false;
1747     Object *target;
1748
1749     /* Go from link<FOO> to FOO.  */
1750     type = object_property_get_type(obj, name, NULL);
1751     target_type = g_strndup(&type[5], strlen(type) - 6);
1752     target = object_resolve_path_type(path, target_type, &ambiguous);
1753
1754     if (ambiguous) {
1755         error_setg(errp, "Path '%s' does not uniquely identify an object",
1756                    path);
1757     } else if (!target) {
1758         target = object_resolve_path(path, &ambiguous);
1759         if (target || ambiguous) {
1760             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1761         } else {
1762             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1763                       "Device '%s' not found", path);
1764         }
1765         target = NULL;
1766     }
1767     g_free(target_type);
1768
1769     return target;
1770 }
1771
1772 static void object_set_link_property(Object *obj, Visitor *v,
1773                                      const char *name, void *opaque,
1774                                      Error **errp)
1775 {
1776     Error *local_err = NULL;
1777     LinkProperty *prop = opaque;
1778     Object **targetp = object_link_get_targetp(obj, prop);
1779     Object *old_target = *targetp;
1780     Object *new_target = NULL;
1781     char *path = NULL;
1782
1783     visit_type_str(v, name, &path, &local_err);
1784
1785     if (!local_err && strcmp(path, "") != 0) {
1786         new_target = object_resolve_link(obj, name, path, &local_err);
1787     }
1788
1789     g_free(path);
1790     if (local_err) {
1791         error_propagate(errp, local_err);
1792         return;
1793     }
1794
1795     prop->check(obj, name, new_target, &local_err);
1796     if (local_err) {
1797         error_propagate(errp, local_err);
1798         return;
1799     }
1800
1801     *targetp = new_target;
1802     if (prop->flags & OBJ_PROP_LINK_STRONG) {
1803         object_ref(new_target);
1804         object_unref(old_target);
1805     }
1806 }
1807
1808 static Object *object_resolve_link_property(Object *parent, void *opaque,
1809                                             const char *part)
1810 {
1811     LinkProperty *lprop = opaque;
1812
1813     return *object_link_get_targetp(parent, lprop);
1814 }
1815
1816 static void object_release_link_property(Object *obj, const char *name,
1817                                          void *opaque)
1818 {
1819     LinkProperty *prop = opaque;
1820     Object **targetp = object_link_get_targetp(obj, prop);
1821
1822     if ((prop->flags & OBJ_PROP_LINK_STRONG) && *targetp) {
1823         object_unref(*targetp);
1824     }
1825     if (!(prop->flags & OBJ_PROP_LINK_CLASS)) {
1826         g_free(prop);
1827     }
1828 }
1829
1830 static ObjectProperty *
1831 object_add_link_prop(Object *obj, const char *name,
1832                      const char *type, void *ptr,
1833                      void (*check)(const Object *, const char *,
1834                                    Object *, Error **),
1835                      ObjectPropertyLinkFlags flags)
1836 {
1837     LinkProperty *prop = g_malloc(sizeof(*prop));
1838     g_autofree char *full_type = NULL;
1839     ObjectProperty *op;
1840
1841     if (flags & OBJ_PROP_LINK_DIRECT) {
1842         prop->target = ptr;
1843     } else {
1844         prop->targetp = ptr;
1845     }
1846     prop->check = check;
1847     prop->flags = flags;
1848
1849     full_type = g_strdup_printf("link<%s>", type);
1850
1851     op = object_property_add(obj, name, full_type,
1852                              object_get_link_property,
1853                              check ? object_set_link_property : NULL,
1854                              object_release_link_property,
1855                              prop);
1856     op->resolve = object_resolve_link_property;
1857     return op;
1858 }
1859
1860 ObjectProperty *
1861 object_property_add_link(Object *obj, const char *name,
1862                          const char *type, Object **targetp,
1863                          void (*check)(const Object *, const char *,
1864                                        Object *, Error **),
1865                          ObjectPropertyLinkFlags flags)
1866 {
1867     return object_add_link_prop(obj, name, type, targetp, check, flags);
1868 }
1869
1870 ObjectProperty *
1871 object_class_property_add_link(ObjectClass *oc,
1872     const char *name,
1873     const char *type, ptrdiff_t offset,
1874     void (*check)(const Object *obj, const char *name,
1875                   Object *val, Error **errp),
1876     ObjectPropertyLinkFlags flags)
1877 {
1878     LinkProperty *prop = g_new0(LinkProperty, 1);
1879     char *full_type;
1880     ObjectProperty *op;
1881
1882     prop->offset = offset;
1883     prop->check = check;
1884     prop->flags = flags | OBJ_PROP_LINK_CLASS;
1885
1886     full_type = g_strdup_printf("link<%s>", type);
1887
1888     op = object_class_property_add(oc, name, full_type,
1889                                    object_get_link_property,
1890                                    check ? object_set_link_property : NULL,
1891                                    object_release_link_property,
1892                                    prop);
1893
1894     op->resolve = object_resolve_link_property;
1895
1896     g_free(full_type);
1897     return op;
1898 }
1899
1900 ObjectProperty *
1901 object_property_add_const_link(Object *obj, const char *name,
1902                                Object *target)
1903 {
1904     return object_add_link_prop(obj, name,
1905                                 object_get_typename(target), target,
1906                                 NULL, OBJ_PROP_LINK_DIRECT);
1907 }
1908
1909 char *object_get_canonical_path_component(const Object *obj)
1910 {
1911     ObjectProperty *prop = NULL;
1912     GHashTableIter iter;
1913
1914     if (obj->parent == NULL) {
1915         return NULL;
1916     }
1917
1918     g_hash_table_iter_init(&iter, obj->parent->properties);
1919     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1920         if (!object_property_is_child(prop)) {
1921             continue;
1922         }
1923
1924         if (prop->opaque == obj) {
1925             return g_strdup(prop->name);
1926         }
1927     }
1928
1929     /* obj had a parent but was not a child, should never happen */
1930     g_assert_not_reached();
1931     return NULL;
1932 }
1933
1934 char *object_get_canonical_path(const Object *obj)
1935 {
1936     Object *root = object_get_root();
1937     char *newpath, *path = NULL;
1938
1939     if (obj == root) {
1940         return g_strdup("/");
1941     }
1942
1943     do {
1944         char *component = object_get_canonical_path_component(obj);
1945
1946         if (!component) {
1947             /* A canonical path must be complete, so discard what was
1948              * collected so far.
1949              */
1950             g_free(path);
1951             return NULL;
1952         }
1953
1954         newpath = g_strdup_printf("/%s%s", component, path ? path : "");
1955         g_free(path);
1956         g_free(component);
1957         path = newpath;
1958         obj = obj->parent;
1959     } while (obj != root);
1960
1961     return path;
1962 }
1963
1964 Object *object_resolve_path_component(Object *parent, const char *part)
1965 {
1966     ObjectProperty *prop = object_property_find(parent, part, NULL);
1967     if (prop == NULL) {
1968         return NULL;
1969     }
1970
1971     if (prop->resolve) {
1972         return prop->resolve(parent, prop->opaque, part);
1973     } else {
1974         return NULL;
1975     }
1976 }
1977
1978 static Object *object_resolve_abs_path(Object *parent,
1979                                           char **parts,
1980                                           const char *typename)
1981 {
1982     Object *child;
1983
1984     if (*parts == NULL) {
1985         return object_dynamic_cast(parent, typename);
1986     }
1987
1988     if (strcmp(*parts, "") == 0) {
1989         return object_resolve_abs_path(parent, parts + 1, typename);
1990     }
1991
1992     child = object_resolve_path_component(parent, *parts);
1993     if (!child) {
1994         return NULL;
1995     }
1996
1997     return object_resolve_abs_path(child, parts + 1, typename);
1998 }
1999
2000 static Object *object_resolve_partial_path(Object *parent,
2001                                            char **parts,
2002                                            const char *typename,
2003                                            bool *ambiguous)
2004 {
2005     Object *obj;
2006     GHashTableIter iter;
2007     ObjectProperty *prop;
2008
2009     obj = object_resolve_abs_path(parent, parts, typename);
2010
2011     g_hash_table_iter_init(&iter, parent->properties);
2012     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
2013         Object *found;
2014
2015         if (!object_property_is_child(prop)) {
2016             continue;
2017         }
2018
2019         found = object_resolve_partial_path(prop->opaque, parts,
2020                                             typename, ambiguous);
2021         if (found) {
2022             if (obj) {
2023                 *ambiguous = true;
2024                 return NULL;
2025             }
2026             obj = found;
2027         }
2028
2029         if (*ambiguous) {
2030             return NULL;
2031         }
2032     }
2033
2034     return obj;
2035 }
2036
2037 Object *object_resolve_path_type(const char *path, const char *typename,
2038                                  bool *ambiguousp)
2039 {
2040     Object *obj;
2041     char **parts;
2042
2043     parts = g_strsplit(path, "/", 0);
2044     assert(parts);
2045
2046     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
2047         bool ambiguous = false;
2048         obj = object_resolve_partial_path(object_get_root(), parts,
2049                                           typename, &ambiguous);
2050         if (ambiguousp) {
2051             *ambiguousp = ambiguous;
2052         }
2053     } else {
2054         obj = object_resolve_abs_path(object_get_root(), parts + 1, typename);
2055     }
2056
2057     g_strfreev(parts);
2058
2059     return obj;
2060 }
2061
2062 Object *object_resolve_path(const char *path, bool *ambiguous)
2063 {
2064     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
2065 }
2066
2067 typedef struct StringProperty
2068 {
2069     char *(*get)(Object *, Error **);
2070     void (*set)(Object *, const char *, Error **);
2071 } StringProperty;
2072
2073 static void property_get_str(Object *obj, Visitor *v, const char *name,
2074                              void *opaque, Error **errp)
2075 {
2076     StringProperty *prop = opaque;
2077     char *value;
2078     Error *err = NULL;
2079
2080     value = prop->get(obj, &err);
2081     if (err) {
2082         error_propagate(errp, err);
2083         return;
2084     }
2085
2086     visit_type_str(v, name, &value, errp);
2087     g_free(value);
2088 }
2089
2090 static void property_set_str(Object *obj, Visitor *v, const char *name,
2091                              void *opaque, Error **errp)
2092 {
2093     StringProperty *prop = opaque;
2094     char *value;
2095     Error *local_err = NULL;
2096
2097     if (!visit_type_str(v, name, &value, &local_err)) {
2098         error_propagate(errp, local_err);
2099         return;
2100     }
2101
2102     prop->set(obj, value, errp);
2103     g_free(value);
2104 }
2105
2106 static void property_release_str(Object *obj, const char *name,
2107                                  void *opaque)
2108 {
2109     StringProperty *prop = opaque;
2110     g_free(prop);
2111 }
2112
2113 ObjectProperty *
2114 object_property_add_str(Object *obj, const char *name,
2115                         char *(*get)(Object *, Error **),
2116                         void (*set)(Object *, const char *, Error **))
2117 {
2118     StringProperty *prop = g_malloc0(sizeof(*prop));
2119
2120     prop->get = get;
2121     prop->set = set;
2122
2123     return object_property_add(obj, name, "string",
2124                                get ? property_get_str : NULL,
2125                                set ? property_set_str : NULL,
2126                                property_release_str,
2127                                prop);
2128 }
2129
2130 ObjectProperty *
2131 object_class_property_add_str(ObjectClass *klass, const char *name,
2132                                    char *(*get)(Object *, Error **),
2133                                    void (*set)(Object *, const char *,
2134                                                Error **))
2135 {
2136     StringProperty *prop = g_malloc0(sizeof(*prop));
2137
2138     prop->get = get;
2139     prop->set = set;
2140
2141     return object_class_property_add(klass, name, "string",
2142                                      get ? property_get_str : NULL,
2143                                      set ? property_set_str : NULL,
2144                                      NULL,
2145                                      prop);
2146 }
2147
2148 typedef struct BoolProperty
2149 {
2150     bool (*get)(Object *, Error **);
2151     void (*set)(Object *, bool, Error **);
2152 } BoolProperty;
2153
2154 static void property_get_bool(Object *obj, Visitor *v, const char *name,
2155                               void *opaque, Error **errp)
2156 {
2157     BoolProperty *prop = opaque;
2158     bool value;
2159     Error *err = NULL;
2160
2161     value = prop->get(obj, &err);
2162     if (err) {
2163         error_propagate(errp, err);
2164         return;
2165     }
2166
2167     visit_type_bool(v, name, &value, errp);
2168 }
2169
2170 static void property_set_bool(Object *obj, Visitor *v, const char *name,
2171                               void *opaque, Error **errp)
2172 {
2173     BoolProperty *prop = opaque;
2174     bool value;
2175     Error *local_err = NULL;
2176
2177     if (!visit_type_bool(v, name, &value, &local_err)) {
2178         error_propagate(errp, local_err);
2179         return;
2180     }
2181
2182     prop->set(obj, value, errp);
2183 }
2184
2185 static void property_release_bool(Object *obj, const char *name,
2186                                   void *opaque)
2187 {
2188     BoolProperty *prop = opaque;
2189     g_free(prop);
2190 }
2191
2192 ObjectProperty *
2193 object_property_add_bool(Object *obj, const char *name,
2194                          bool (*get)(Object *, Error **),
2195                          void (*set)(Object *, bool, Error **))
2196 {
2197     BoolProperty *prop = g_malloc0(sizeof(*prop));
2198
2199     prop->get = get;
2200     prop->set = set;
2201
2202     return object_property_add(obj, name, "bool",
2203                                get ? property_get_bool : NULL,
2204                                set ? property_set_bool : NULL,
2205                                property_release_bool,
2206                                prop);
2207 }
2208
2209 ObjectProperty *
2210 object_class_property_add_bool(ObjectClass *klass, const char *name,
2211                                     bool (*get)(Object *, Error **),
2212                                     void (*set)(Object *, bool, Error **))
2213 {
2214     BoolProperty *prop = g_malloc0(sizeof(*prop));
2215
2216     prop->get = get;
2217     prop->set = set;
2218
2219     return object_class_property_add(klass, name, "bool",
2220                                      get ? property_get_bool : NULL,
2221                                      set ? property_set_bool : NULL,
2222                                      NULL,
2223                                      prop);
2224 }
2225
2226 static void property_get_enum(Object *obj, Visitor *v, const char *name,
2227                               void *opaque, Error **errp)
2228 {
2229     EnumProperty *prop = opaque;
2230     int value;
2231     Error *err = NULL;
2232
2233     value = prop->get(obj, &err);
2234     if (err) {
2235         error_propagate(errp, err);
2236         return;
2237     }
2238
2239     visit_type_enum(v, name, &value, prop->lookup, errp);
2240 }
2241
2242 static void property_set_enum(Object *obj, Visitor *v, const char *name,
2243                               void *opaque, Error **errp)
2244 {
2245     EnumProperty *prop = opaque;
2246     int value;
2247     Error *err = NULL;
2248
2249     if (!visit_type_enum(v, name, &value, prop->lookup, &err)) {
2250         error_propagate(errp, err);
2251         return;
2252     }
2253     prop->set(obj, value, errp);
2254 }
2255
2256 static void property_release_enum(Object *obj, const char *name,
2257                                   void *opaque)
2258 {
2259     EnumProperty *prop = opaque;
2260     g_free(prop);
2261 }
2262
2263 ObjectProperty *
2264 object_property_add_enum(Object *obj, const char *name,
2265                          const char *typename,
2266                          const QEnumLookup *lookup,
2267                          int (*get)(Object *, Error **),
2268                          void (*set)(Object *, int, Error **))
2269 {
2270     EnumProperty *prop = g_malloc(sizeof(*prop));
2271
2272     prop->lookup = lookup;
2273     prop->get = get;
2274     prop->set = set;
2275
2276     return object_property_add(obj, name, typename,
2277                                get ? property_get_enum : NULL,
2278                                set ? property_set_enum : NULL,
2279                                property_release_enum,
2280                                prop);
2281 }
2282
2283 ObjectProperty *
2284 object_class_property_add_enum(ObjectClass *klass, 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_class_property_add(klass, name, typename,
2297                                      get ? property_get_enum : NULL,
2298                                      set ? property_set_enum : NULL,
2299                                      NULL,
2300                                      prop);
2301 }
2302
2303 typedef struct TMProperty {
2304     void (*get)(Object *, struct tm *, Error **);
2305 } TMProperty;
2306
2307 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2308                             void *opaque, Error **errp)
2309 {
2310     TMProperty *prop = opaque;
2311     Error *err = NULL;
2312     struct tm value;
2313
2314     prop->get(obj, &value, &err);
2315     if (err) {
2316         goto out;
2317     }
2318
2319     if (!visit_start_struct(v, name, NULL, 0, &err)) {
2320         goto out;
2321     }
2322     if (!visit_type_int32(v, "tm_year", &value.tm_year, &err)) {
2323         goto out_end;
2324     }
2325     if (!visit_type_int32(v, "tm_mon", &value.tm_mon, &err)) {
2326         goto out_end;
2327     }
2328     if (!visit_type_int32(v, "tm_mday", &value.tm_mday, &err)) {
2329         goto out_end;
2330     }
2331     if (!visit_type_int32(v, "tm_hour", &value.tm_hour, &err)) {
2332         goto out_end;
2333     }
2334     if (!visit_type_int32(v, "tm_min", &value.tm_min, &err)) {
2335         goto out_end;
2336     }
2337     if (!visit_type_int32(v, "tm_sec", &value.tm_sec, &err)) {
2338         goto out_end;
2339     }
2340     visit_check_struct(v, &err);
2341 out_end:
2342     visit_end_struct(v, NULL);
2343 out:
2344     error_propagate(errp, err);
2345
2346 }
2347
2348 static void property_release_tm(Object *obj, const char *name,
2349                                 void *opaque)
2350 {
2351     TMProperty *prop = opaque;
2352     g_free(prop);
2353 }
2354
2355 ObjectProperty *
2356 object_property_add_tm(Object *obj, const char *name,
2357                        void (*get)(Object *, struct tm *, Error **))
2358 {
2359     TMProperty *prop = g_malloc0(sizeof(*prop));
2360
2361     prop->get = get;
2362
2363     return object_property_add(obj, name, "struct tm",
2364                                get ? property_get_tm : NULL, NULL,
2365                                property_release_tm,
2366                                prop);
2367 }
2368
2369 ObjectProperty *
2370 object_class_property_add_tm(ObjectClass *klass, const char *name,
2371                              void (*get)(Object *, struct tm *, Error **))
2372 {
2373     TMProperty *prop = g_malloc0(sizeof(*prop));
2374
2375     prop->get = get;
2376
2377     return object_class_property_add(klass, name, "struct tm",
2378                                      get ? property_get_tm : NULL,
2379                                      NULL, NULL, prop);
2380 }
2381
2382 static char *qdev_get_type(Object *obj, Error **errp)
2383 {
2384     return g_strdup(object_get_typename(obj));
2385 }
2386
2387 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2388                                    void *opaque, Error **errp)
2389 {
2390     uint8_t value = *(uint8_t *)opaque;
2391     visit_type_uint8(v, name, &value, errp);
2392 }
2393
2394 static void property_set_uint8_ptr(Object *obj, Visitor *v, const char *name,
2395                                    void *opaque, Error **errp)
2396 {
2397     uint8_t *field = opaque;
2398     uint8_t value;
2399     Error *local_err = NULL;
2400
2401     if (!visit_type_uint8(v, name, &value, &local_err)) {
2402         error_propagate(errp, local_err);
2403         return;
2404     }
2405
2406     *field = value;
2407 }
2408
2409 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2410                                     void *opaque, Error **errp)
2411 {
2412     uint16_t value = *(uint16_t *)opaque;
2413     visit_type_uint16(v, name, &value, errp);
2414 }
2415
2416 static void property_set_uint16_ptr(Object *obj, Visitor *v, const char *name,
2417                                     void *opaque, Error **errp)
2418 {
2419     uint16_t *field = opaque;
2420     uint16_t value;
2421     Error *local_err = NULL;
2422
2423     if (!visit_type_uint16(v, name, &value, &local_err)) {
2424         error_propagate(errp, local_err);
2425         return;
2426     }
2427
2428     *field = value;
2429 }
2430
2431 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2432                                     void *opaque, Error **errp)
2433 {
2434     uint32_t value = *(uint32_t *)opaque;
2435     visit_type_uint32(v, name, &value, errp);
2436 }
2437
2438 static void property_set_uint32_ptr(Object *obj, Visitor *v, const char *name,
2439                                     void *opaque, Error **errp)
2440 {
2441     uint32_t *field = opaque;
2442     uint32_t value;
2443     Error *local_err = NULL;
2444
2445     if (!visit_type_uint32(v, name, &value, &local_err)) {
2446         error_propagate(errp, local_err);
2447         return;
2448     }
2449
2450     *field = value;
2451 }
2452
2453 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2454                                     void *opaque, Error **errp)
2455 {
2456     uint64_t value = *(uint64_t *)opaque;
2457     visit_type_uint64(v, name, &value, errp);
2458 }
2459
2460 static void property_set_uint64_ptr(Object *obj, Visitor *v, const char *name,
2461                                     void *opaque, Error **errp)
2462 {
2463     uint64_t *field = opaque;
2464     uint64_t value;
2465     Error *local_err = NULL;
2466
2467     if (!visit_type_uint64(v, name, &value, &local_err)) {
2468         error_propagate(errp, local_err);
2469         return;
2470     }
2471
2472     *field = value;
2473 }
2474
2475 ObjectProperty *
2476 object_property_add_uint8_ptr(Object *obj, const char *name,
2477                               const uint8_t *v,
2478                               ObjectPropertyFlags flags)
2479 {
2480     ObjectPropertyAccessor *getter = NULL;
2481     ObjectPropertyAccessor *setter = NULL;
2482
2483     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2484         getter = property_get_uint8_ptr;
2485     }
2486
2487     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2488         setter = property_set_uint8_ptr;
2489     }
2490
2491     return object_property_add(obj, name, "uint8",
2492                                getter, setter, NULL, (void *)v);
2493 }
2494
2495 ObjectProperty *
2496 object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2497                                     const uint8_t *v,
2498                                     ObjectPropertyFlags flags)
2499 {
2500     ObjectPropertyAccessor *getter = NULL;
2501     ObjectPropertyAccessor *setter = NULL;
2502
2503     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2504         getter = property_get_uint8_ptr;
2505     }
2506
2507     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2508         setter = property_set_uint8_ptr;
2509     }
2510
2511     return object_class_property_add(klass, name, "uint8",
2512                                      getter, setter, NULL, (void *)v);
2513 }
2514
2515 ObjectProperty *
2516 object_property_add_uint16_ptr(Object *obj, const char *name,
2517                                const uint16_t *v,
2518                                ObjectPropertyFlags flags)
2519 {
2520     ObjectPropertyAccessor *getter = NULL;
2521     ObjectPropertyAccessor *setter = NULL;
2522
2523     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2524         getter = property_get_uint16_ptr;
2525     }
2526
2527     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2528         setter = property_set_uint16_ptr;
2529     }
2530
2531     return object_property_add(obj, name, "uint16",
2532                                getter, setter, NULL, (void *)v);
2533 }
2534
2535 ObjectProperty *
2536 object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2537                                      const uint16_t *v,
2538                                      ObjectPropertyFlags flags)
2539 {
2540     ObjectPropertyAccessor *getter = NULL;
2541     ObjectPropertyAccessor *setter = NULL;
2542
2543     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2544         getter = property_get_uint16_ptr;
2545     }
2546
2547     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2548         setter = property_set_uint16_ptr;
2549     }
2550
2551     return object_class_property_add(klass, name, "uint16",
2552                                      getter, setter, NULL, (void *)v);
2553 }
2554
2555 ObjectProperty *
2556 object_property_add_uint32_ptr(Object *obj, const char *name,
2557                                const uint32_t *v,
2558                                ObjectPropertyFlags flags)
2559 {
2560     ObjectPropertyAccessor *getter = NULL;
2561     ObjectPropertyAccessor *setter = NULL;
2562
2563     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2564         getter = property_get_uint32_ptr;
2565     }
2566
2567     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2568         setter = property_set_uint32_ptr;
2569     }
2570
2571     return object_property_add(obj, name, "uint32",
2572                                getter, setter, NULL, (void *)v);
2573 }
2574
2575 ObjectProperty *
2576 object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2577                                      const uint32_t *v,
2578                                      ObjectPropertyFlags flags)
2579 {
2580     ObjectPropertyAccessor *getter = NULL;
2581     ObjectPropertyAccessor *setter = NULL;
2582
2583     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2584         getter = property_get_uint32_ptr;
2585     }
2586
2587     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2588         setter = property_set_uint32_ptr;
2589     }
2590
2591     return object_class_property_add(klass, name, "uint32",
2592                                      getter, setter, NULL, (void *)v);
2593 }
2594
2595 ObjectProperty *
2596 object_property_add_uint64_ptr(Object *obj, const char *name,
2597                                const uint64_t *v,
2598                                ObjectPropertyFlags flags)
2599 {
2600     ObjectPropertyAccessor *getter = NULL;
2601     ObjectPropertyAccessor *setter = NULL;
2602
2603     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2604         getter = property_get_uint64_ptr;
2605     }
2606
2607     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2608         setter = property_set_uint64_ptr;
2609     }
2610
2611     return object_property_add(obj, name, "uint64",
2612                                getter, setter, NULL, (void *)v);
2613 }
2614
2615 ObjectProperty *
2616 object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2617                                      const uint64_t *v,
2618                                      ObjectPropertyFlags flags)
2619 {
2620     ObjectPropertyAccessor *getter = NULL;
2621     ObjectPropertyAccessor *setter = NULL;
2622
2623     if ((flags & OBJ_PROP_FLAG_READ) == OBJ_PROP_FLAG_READ) {
2624         getter = property_get_uint64_ptr;
2625     }
2626
2627     if ((flags & OBJ_PROP_FLAG_WRITE) == OBJ_PROP_FLAG_WRITE) {
2628         setter = property_set_uint64_ptr;
2629     }
2630
2631     return object_class_property_add(klass, name, "uint64",
2632                                      getter, setter, NULL, (void *)v);
2633 }
2634
2635 typedef struct {
2636     Object *target_obj;
2637     char *target_name;
2638 } AliasProperty;
2639
2640 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2641                                void *opaque, Error **errp)
2642 {
2643     AliasProperty *prop = opaque;
2644
2645     object_property_get(prop->target_obj, v, prop->target_name, errp);
2646 }
2647
2648 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2649                                void *opaque, Error **errp)
2650 {
2651     AliasProperty *prop = opaque;
2652
2653     object_property_set(prop->target_obj, v, prop->target_name, errp);
2654 }
2655
2656 static Object *property_resolve_alias(Object *obj, void *opaque,
2657                                       const char *part)
2658 {
2659     AliasProperty *prop = opaque;
2660
2661     return object_resolve_path_component(prop->target_obj, prop->target_name);
2662 }
2663
2664 static void property_release_alias(Object *obj, const char *name, void *opaque)
2665 {
2666     AliasProperty *prop = opaque;
2667
2668     g_free(prop->target_name);
2669     g_free(prop);
2670 }
2671
2672 ObjectProperty *
2673 object_property_add_alias(Object *obj, const char *name,
2674                           Object *target_obj, const char *target_name)
2675 {
2676     AliasProperty *prop;
2677     ObjectProperty *op;
2678     ObjectProperty *target_prop;
2679     g_autofree char *prop_type = NULL;
2680
2681     target_prop = object_property_find(target_obj, target_name,
2682                                        &error_abort);
2683
2684     if (object_property_is_child(target_prop)) {
2685         prop_type = g_strdup_printf("link%s",
2686                                     target_prop->type + strlen("child"));
2687     } else {
2688         prop_type = g_strdup(target_prop->type);
2689     }
2690
2691     prop = g_malloc(sizeof(*prop));
2692     prop->target_obj = target_obj;
2693     prop->target_name = g_strdup(target_name);
2694
2695     op = object_property_add(obj, name, prop_type,
2696                              property_get_alias,
2697                              property_set_alias,
2698                              property_release_alias,
2699                              prop);
2700     op->resolve = property_resolve_alias;
2701     if (target_prop->defval) {
2702         op->defval = qobject_ref(target_prop->defval);
2703     }
2704
2705     object_property_set_description(obj, op->name,
2706                                     target_prop->description);
2707     return op;
2708 }
2709
2710 void object_property_set_description(Object *obj, const char *name,
2711                                      const char *description)
2712 {
2713     ObjectProperty *op;
2714
2715     op = object_property_find(obj, name, &error_abort);
2716     g_free(op->description);
2717     op->description = g_strdup(description);
2718 }
2719
2720 void object_class_property_set_description(ObjectClass *klass,
2721                                            const char *name,
2722                                            const char *description)
2723 {
2724     ObjectProperty *op;
2725
2726     op = g_hash_table_lookup(klass->properties, name);
2727     g_free(op->description);
2728     op->description = g_strdup(description);
2729 }
2730
2731 static void object_class_init(ObjectClass *klass, void *data)
2732 {
2733     object_class_property_add_str(klass, "type", qdev_get_type,
2734                                   NULL);
2735 }
2736
2737 static void register_types(void)
2738 {
2739     static TypeInfo interface_info = {
2740         .name = TYPE_INTERFACE,
2741         .class_size = sizeof(InterfaceClass),
2742         .abstract = true,
2743     };
2744
2745     static TypeInfo object_info = {
2746         .name = TYPE_OBJECT,
2747         .instance_size = sizeof(Object),
2748         .class_init = object_class_init,
2749         .abstract = true,
2750     };
2751
2752     type_interface = type_register_internal(&interface_info);
2753     type_register_internal(&object_info);
2754 }
2755
2756 type_init(register_types)